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freebsd-nq/sys/netinet/sctp_output.c
Randall Stewart a5d547add3 1) Fixes on a number of different collision case LOR's. 
2) Fix all "magic numbers" to be constants.
3) A collision case that would generate two associations to
   the same peer due to a missing lock is fixed.
4) Added tracking of where timers are stopped.
Approved by:	gnn
2006-12-14 17:02:55 +00:00

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/*-
* Copyright (c) 2001-2006, Cisco Systems, Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* a) Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* b) Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the distribution.
*
* c) Neither the name of Cisco Systems, Inc. nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
/* $KAME: sctp_output.c,v 1.46 2005/03/06 16:04:17 itojun Exp $ */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_ipsec.h"
#include "opt_compat.h"
#include "opt_inet6.h"
#include "opt_inet.h"
#include "opt_sctp.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <sys/resourcevar.h>
#include <sys/uio.h>
#ifdef INET6
#include <sys/domain.h>
#endif
#include <sys/limits.h>
#include <machine/cpu.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/if_var.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.h>
#include <netinet/in_var.h>
#include <netinet/ip_var.h>
#ifdef INET6
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/scope6_var.h>
#include <netinet6/nd6.h>
#include <netinet6/in6_pcb.h>
#include <netinet/icmp6.h>
#endif /* INET6 */
#ifndef in6pcb
#define in6pcb inpcb
#endif
#ifdef IPSEC
#include <netinet6/ipsec.h>
#include <netkey/key.h>
#endif /* IPSEC */
#include <netinet/sctp_os.h>
#include <netinet/sctp_var.h>
#include <netinet/sctp_header.h>
#include <netinet/sctp_pcb.h>
#include <netinet/sctputil.h>
#include <netinet/sctp_output.h>
#include <netinet/sctp_uio.h>
#include <netinet/sctputil.h>
#include <netinet/sctp_auth.h>
#include <netinet/sctp_timer.h>
#include <netinet/sctp_asconf.h>
#include <netinet/sctp_indata.h>
#include <netinet/sctp_bsd_addr.h>
#ifdef SCTP_DEBUG
extern uint32_t sctp_debug_on;
#endif
#define SCTP_MAX_GAPS_INARRAY 4
struct sack_track {
uint8_t right_edge; /* mergable on the right edge */
uint8_t left_edge; /* mergable on the left edge */
uint8_t num_entries;
uint8_t spare;
struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
};
struct sack_track sack_array[256] = {
{0, 0, 0, 0, /* 0x00 */
{{0, 0},
{0, 0},
{0, 0},
{0, 0}
}
},
{1, 0, 1, 0, /* 0x01 */
{{0, 0},
{0, 0},
{0, 0},
{0, 0}
}
},
{0, 0, 1, 0, /* 0x02 */
{{1, 1},
{0, 0},
{0, 0},
{0, 0}
}
},
{1, 0, 1, 0, /* 0x03 */
{{0, 1},
{0, 0},
{0, 0},
{0, 0}
}
},
{0, 0, 1, 0, /* 0x04 */
{{2, 2},
{0, 0},
{0, 0},
{0, 0}
}
},
{1, 0, 2, 0, /* 0x05 */
{{0, 0},
{2, 2},
{0, 0},
{0, 0}
}
},
{0, 0, 1, 0, /* 0x06 */
{{1, 2},
{0, 0},
{0, 0},
{0, 0}
}
},
{1, 0, 1, 0, /* 0x07 */
{{0, 2},
{0, 0},
{0, 0},
{0, 0}
}
},
{0, 0, 1, 0, /* 0x08 */
{{3, 3},
{0, 0},
{0, 0},
{0, 0}
}
},
{1, 0, 2, 0, /* 0x09 */
{{0, 0},
{3, 3},
{0, 0},
{0, 0}
}
},
{0, 0, 2, 0, /* 0x0a */
{{1, 1},
{3, 3},
{0, 0},
{0, 0}
}
},
{1, 0, 2, 0, /* 0x0b */
{{0, 1},
{3, 3},
{0, 0},
{0, 0}
}
},
{0, 0, 1, 0, /* 0x0c */
{{2, 3},
{0, 0},
{0, 0},
{0, 0}
}
},
{1, 0, 2, 0, /* 0x0d */
{{0, 0},
{2, 3},
{0, 0},
{0, 0}
}
},
{0, 0, 1, 0, /* 0x0e */
{{1, 3},
{0, 0},
{0, 0},
{0, 0}
}
},
{1, 0, 1, 0, /* 0x0f */
{{0, 3},
{0, 0},
{0, 0},
{0, 0}
}
},
{0, 0, 1, 0, /* 0x10 */
{{4, 4},
{0, 0},
{0, 0},
{0, 0}
}
},
{1, 0, 2, 0, /* 0x11 */
{{0, 0},
{4, 4},
{0, 0},
{0, 0}
}
},
{0, 0, 2, 0, /* 0x12 */
{{1, 1},
{4, 4},
{0, 0},
{0, 0}
}
},
{1, 0, 2, 0, /* 0x13 */
{{0, 1},
{4, 4},
{0, 0},
{0, 0}
}
},
{0, 0, 2, 0, /* 0x14 */
{{2, 2},
{4, 4},
{0, 0},
{0, 0}
}
},
{1, 0, 3, 0, /* 0x15 */
{{0, 0},
{2, 2},
{4, 4},
{0, 0}
}
},
{0, 0, 2, 0, /* 0x16 */
{{1, 2},
{4, 4},
{0, 0},
{0, 0}
}
},
{1, 0, 2, 0, /* 0x17 */
{{0, 2},
{4, 4},
{0, 0},
{0, 0}
}
},
{0, 0, 1, 0, /* 0x18 */
{{3, 4},
{0, 0},
{0, 0},
{0, 0}
}
},
{1, 0, 2, 0, /* 0x19 */
{{0, 0},
{3, 4},
{0, 0},
{0, 0}
}
},
{0, 0, 2, 0, /* 0x1a */
{{1, 1},
{3, 4},
{0, 0},
{0, 0}
}
},
{1, 0, 2, 0, /* 0x1b */
{{0, 1},
{3, 4},
{0, 0},
{0, 0}
}
},
{0, 0, 1, 0, /* 0x1c */
{{2, 4},
{0, 0},
{0, 0},
{0, 0}
}
},
{1, 0, 2, 0, /* 0x1d */
{{0, 0},
{2, 4},
{0, 0},
{0, 0}
}
},
{0, 0, 1, 0, /* 0x1e */
{{1, 4},
{0, 0},
{0, 0},
{0, 0}
}
},
{1, 0, 1, 0, /* 0x1f */
{{0, 4},
{0, 0},
{0, 0},
{0, 0}
}
},
{0, 0, 1, 0, /* 0x20 */
{{5, 5},
{0, 0},
{0, 0},
{0, 0}
}
},
{1, 0, 2, 0, /* 0x21 */
{{0, 0},
{5, 5},
{0, 0},
{0, 0}
}
},
{0, 0, 2, 0, /* 0x22 */
{{1, 1},
{5, 5},
{0, 0},
{0, 0}
}
},
{1, 0, 2, 0, /* 0x23 */
{{0, 1},
{5, 5},
{0, 0},
{0, 0}
}
},
{0, 0, 2, 0, /* 0x24 */
{{2, 2},
{5, 5},
{0, 0},
{0, 0}
}
},
{1, 0, 3, 0, /* 0x25 */
{{0, 0},
{2, 2},
{5, 5},
{0, 0}
}
},
{0, 0, 2, 0, /* 0x26 */
{{1, 2},
{5, 5},
{0, 0},
{0, 0}
}
},
{1, 0, 2, 0, /* 0x27 */
{{0, 2},
{5, 5},
{0, 0},
{0, 0}
}
},
{0, 0, 2, 0, /* 0x28 */
{{3, 3},
{5, 5},
{0, 0},
{0, 0}
}
},
{1, 0, 3, 0, /* 0x29 */
{{0, 0},
{3, 3},
{5, 5},
{0, 0}
}
},
{0, 0, 3, 0, /* 0x2a */
{{1, 1},
{3, 3},
{5, 5},
{0, 0}
}
},
{1, 0, 3, 0, /* 0x2b */
{{0, 1},
{3, 3},
{5, 5},
{0, 0}
}
},
{0, 0, 2, 0, /* 0x2c */
{{2, 3},
{5, 5},
{0, 0},
{0, 0}
}
},
{1, 0, 3, 0, /* 0x2d */
{{0, 0},
{2, 3},
{5, 5},
{0, 0}
}
},
{0, 0, 2, 0, /* 0x2e */
{{1, 3},
{5, 5},
{0, 0},
{0, 0}
}
},
{1, 0, 2, 0, /* 0x2f */
{{0, 3},
{5, 5},
{0, 0},
{0, 0}
}
},
{0, 0, 1, 0, /* 0x30 */
{{4, 5},
{0, 0},
{0, 0},
{0, 0}
}
},
{1, 0, 2, 0, /* 0x31 */
{{0, 0},
{4, 5},
{0, 0},
{0, 0}
}
},
{0, 0, 2, 0, /* 0x32 */
{{1, 1},
{4, 5},
{0, 0},
{0, 0}
}
},
{1, 0, 2, 0, /* 0x33 */
{{0, 1},
{4, 5},
{0, 0},
{0, 0}
}
},
{0, 0, 2, 0, /* 0x34 */
{{2, 2},
{4, 5},
{0, 0},
{0, 0}
}
},
{1, 0, 3, 0, /* 0x35 */
{{0, 0},
{2, 2},
{4, 5},
{0, 0}
}
},
{0, 0, 2, 0, /* 0x36 */
{{1, 2},
{4, 5},
{0, 0},
{0, 0}
}
},
{1, 0, 2, 0, /* 0x37 */
{{0, 2},
{4, 5},
{0, 0},
{0, 0}
}
},
{0, 0, 1, 0, /* 0x38 */
{{3, 5},
{0, 0},
{0, 0},
{0, 0}
}
},
{1, 0, 2, 0, /* 0x39 */
{{0, 0},
{3, 5},
{0, 0},
{0, 0}
}
},
{0, 0, 2, 0, /* 0x3a */
{{1, 1},
{3, 5},
{0, 0},
{0, 0}
}
},
{1, 0, 2, 0, /* 0x3b */
{{0, 1},
{3, 5},
{0, 0},
{0, 0}
}
},
{0, 0, 1, 0, /* 0x3c */
{{2, 5},
{0, 0},
{0, 0},
{0, 0}
}
},
{1, 0, 2, 0, /* 0x3d */
{{0, 0},
{2, 5},
{0, 0},
{0, 0}
}
},
{0, 0, 1, 0, /* 0x3e */
{{1, 5},
{0, 0},
{0, 0},
{0, 0}
}
},
{1, 0, 1, 0, /* 0x3f */
{{0, 5},
{0, 0},
{0, 0},
{0, 0}
}
},
{0, 0, 1, 0, /* 0x40 */
{{6, 6},
{0, 0},
{0, 0},
{0, 0}
}
},
{1, 0, 2, 0, /* 0x41 */
{{0, 0},
{6, 6},
{0, 0},
{0, 0}
}
},
{0, 0, 2, 0, /* 0x42 */
{{1, 1},
{6, 6},
{0, 0},
{0, 0}
}
},
{1, 0, 2, 0, /* 0x43 */
{{0, 1},
{6, 6},
{0, 0},
{0, 0}
}
},
{0, 0, 2, 0, /* 0x44 */
{{2, 2},
{6, 6},
{0, 0},
{0, 0}
}
},
{1, 0, 3, 0, /* 0x45 */
{{0, 0},
{2, 2},
{6, 6},
{0, 0}
}
},
{0, 0, 2, 0, /* 0x46 */
{{1, 2},
{6, 6},
{0, 0},
{0, 0}
}
},
{1, 0, 2, 0, /* 0x47 */
{{0, 2},
{6, 6},
{0, 0},
{0, 0}
}
},
{0, 0, 2, 0, /* 0x48 */
{{3, 3},
{6, 6},
{0, 0},
{0, 0}
}
},
{1, 0, 3, 0, /* 0x49 */
{{0, 0},
{3, 3},
{6, 6},
{0, 0}
}
},
{0, 0, 3, 0, /* 0x4a */
{{1, 1},
{3, 3},
{6, 6},
{0, 0}
}
},
{1, 0, 3, 0, /* 0x4b */
{{0, 1},
{3, 3},
{6, 6},
{0, 0}
}
},
{0, 0, 2, 0, /* 0x4c */
{{2, 3},
{6, 6},
{0, 0},
{0, 0}
}
},
{1, 0, 3, 0, /* 0x4d */
{{0, 0},
{2, 3},
{6, 6},
{0, 0}
}
},
{0, 0, 2, 0, /* 0x4e */
{{1, 3},
{6, 6},
{0, 0},
{0, 0}
}
},
{1, 0, 2, 0, /* 0x4f */
{{0, 3},
{6, 6},
{0, 0},
{0, 0}
}
},
{0, 0, 2, 0, /* 0x50 */
{{4, 4},
{6, 6},
{0, 0},
{0, 0}
}
},
{1, 0, 3, 0, /* 0x51 */
{{0, 0},
{4, 4},
{6, 6},
{0, 0}
}
},
{0, 0, 3, 0, /* 0x52 */
{{1, 1},
{4, 4},
{6, 6},
{0, 0}
}
},
{1, 0, 3, 0, /* 0x53 */
{{0, 1},
{4, 4},
{6, 6},
{0, 0}
}
},
{0, 0, 3, 0, /* 0x54 */
{{2, 2},
{4, 4},
{6, 6},
{0, 0}
}
},
{1, 0, 4, 0, /* 0x55 */
{{0, 0},
{2, 2},
{4, 4},
{6, 6}
}
},
{0, 0, 3, 0, /* 0x56 */
{{1, 2},
{4, 4},
{6, 6},
{0, 0}
}
},
{1, 0, 3, 0, /* 0x57 */
{{0, 2},
{4, 4},
{6, 6},
{0, 0}
}
},
{0, 0, 2, 0, /* 0x58 */
{{3, 4},
{6, 6},
{0, 0},
{0, 0}
}
},
{1, 0, 3, 0, /* 0x59 */
{{0, 0},
{3, 4},
{6, 6},
{0, 0}
}
},
{0, 0, 3, 0, /* 0x5a */
{{1, 1},
{3, 4},
{6, 6},
{0, 0}
}
},
{1, 0, 3, 0, /* 0x5b */
{{0, 1},
{3, 4},
{6, 6},
{0, 0}
}
},
{0, 0, 2, 0, /* 0x5c */
{{2, 4},
{6, 6},
{0, 0},
{0, 0}
}
},
{1, 0, 3, 0, /* 0x5d */
{{0, 0},
{2, 4},
{6, 6},
{0, 0}
}
},
{0, 0, 2, 0, /* 0x5e */
{{1, 4},
{6, 6},
{0, 0},
{0, 0}
}
},
{1, 0, 2, 0, /* 0x5f */
{{0, 4},
{6, 6},
{0, 0},
{0, 0}
}
},
{0, 0, 1, 0, /* 0x60 */
{{5, 6},
{0, 0},
{0, 0},
{0, 0}
}
},
{1, 0, 2, 0, /* 0x61 */
{{0, 0},
{5, 6},
{0, 0},
{0, 0}
}
},
{0, 0, 2, 0, /* 0x62 */
{{1, 1},
{5, 6},
{0, 0},
{0, 0}
}
},
{1, 0, 2, 0, /* 0x63 */
{{0, 1},
{5, 6},
{0, 0},
{0, 0}
}
},
{0, 0, 2, 0, /* 0x64 */
{{2, 2},
{5, 6},
{0, 0},
{0, 0}
}
},
{1, 0, 3, 0, /* 0x65 */
{{0, 0},
{2, 2},
{5, 6},
{0, 0}
}
},
{0, 0, 2, 0, /* 0x66 */
{{1, 2},
{5, 6},
{0, 0},
{0, 0}
}
},
{1, 0, 2, 0, /* 0x67 */
{{0, 2},
{5, 6},
{0, 0},
{0, 0}
}
},
{0, 0, 2, 0, /* 0x68 */
{{3, 3},
{5, 6},
{0, 0},
{0, 0}
}
},
{1, 0, 3, 0, /* 0x69 */
{{0, 0},
{3, 3},
{5, 6},
{0, 0}
}
},
{0, 0, 3, 0, /* 0x6a */
{{1, 1},
{3, 3},
{5, 6},
{0, 0}
}
},
{1, 0, 3, 0, /* 0x6b */
{{0, 1},
{3, 3},
{5, 6},
{0, 0}
}
},
{0, 0, 2, 0, /* 0x6c */
{{2, 3},
{5, 6},
{0, 0},
{0, 0}
}
},
{1, 0, 3, 0, /* 0x6d */
{{0, 0},
{2, 3},
{5, 6},
{0, 0}
}
},
{0, 0, 2, 0, /* 0x6e */
{{1, 3},
{5, 6},
{0, 0},
{0, 0}
}
},
{1, 0, 2, 0, /* 0x6f */
{{0, 3},
{5, 6},
{0, 0},
{0, 0}
}
},
{0, 0, 1, 0, /* 0x70 */
{{4, 6},
{0, 0},
{0, 0},
{0, 0}
}
},
{1, 0, 2, 0, /* 0x71 */
{{0, 0},
{4, 6},
{0, 0},
{0, 0}
}
},
{0, 0, 2, 0, /* 0x72 */
{{1, 1},
{4, 6},
{0, 0},
{0, 0}
}
},
{1, 0, 2, 0, /* 0x73 */
{{0, 1},
{4, 6},
{0, 0},
{0, 0}
}
},
{0, 0, 2, 0, /* 0x74 */
{{2, 2},
{4, 6},
{0, 0},
{0, 0}
}
},
{1, 0, 3, 0, /* 0x75 */
{{0, 0},
{2, 2},
{4, 6},
{0, 0}
}
},
{0, 0, 2, 0, /* 0x76 */
{{1, 2},
{4, 6},
{0, 0},
{0, 0}
}
},
{1, 0, 2, 0, /* 0x77 */
{{0, 2},
{4, 6},
{0, 0},
{0, 0}
}
},
{0, 0, 1, 0, /* 0x78 */
{{3, 6},
{0, 0},
{0, 0},
{0, 0}
}
},
{1, 0, 2, 0, /* 0x79 */
{{0, 0},
{3, 6},
{0, 0},
{0, 0}
}
},
{0, 0, 2, 0, /* 0x7a */
{{1, 1},
{3, 6},
{0, 0},
{0, 0}
}
},
{1, 0, 2, 0, /* 0x7b */
{{0, 1},
{3, 6},
{0, 0},
{0, 0}
}
},
{0, 0, 1, 0, /* 0x7c */
{{2, 6},
{0, 0},
{0, 0},
{0, 0}
}
},
{1, 0, 2, 0, /* 0x7d */
{{0, 0},
{2, 6},
{0, 0},
{0, 0}
}
},
{0, 0, 1, 0, /* 0x7e */
{{1, 6},
{0, 0},
{0, 0},
{0, 0}
}
},
{1, 0, 1, 0, /* 0x7f */
{{0, 6},
{0, 0},
{0, 0},
{0, 0}
}
},
{0, 1, 1, 0, /* 0x80 */
{{7, 7},
{0, 0},
{0, 0},
{0, 0}
}
},
{1, 1, 2, 0, /* 0x81 */
{{0, 0},
{7, 7},
{0, 0},
{0, 0}
}
},
{0, 1, 2, 0, /* 0x82 */
{{1, 1},
{7, 7},
{0, 0},
{0, 0}
}
},
{1, 1, 2, 0, /* 0x83 */
{{0, 1},
{7, 7},
{0, 0},
{0, 0}
}
},
{0, 1, 2, 0, /* 0x84 */
{{2, 2},
{7, 7},
{0, 0},
{0, 0}
}
},
{1, 1, 3, 0, /* 0x85 */
{{0, 0},
{2, 2},
{7, 7},
{0, 0}
}
},
{0, 1, 2, 0, /* 0x86 */
{{1, 2},
{7, 7},
{0, 0},
{0, 0}
}
},
{1, 1, 2, 0, /* 0x87 */
{{0, 2},
{7, 7},
{0, 0},
{0, 0}
}
},
{0, 1, 2, 0, /* 0x88 */
{{3, 3},
{7, 7},
{0, 0},
{0, 0}
}
},
{1, 1, 3, 0, /* 0x89 */
{{0, 0},
{3, 3},
{7, 7},
{0, 0}
}
},
{0, 1, 3, 0, /* 0x8a */
{{1, 1},
{3, 3},
{7, 7},
{0, 0}
}
},
{1, 1, 3, 0, /* 0x8b */
{{0, 1},
{3, 3},
{7, 7},
{0, 0}
}
},
{0, 1, 2, 0, /* 0x8c */
{{2, 3},
{7, 7},
{0, 0},
{0, 0}
}
},
{1, 1, 3, 0, /* 0x8d */
{{0, 0},
{2, 3},
{7, 7},
{0, 0}
}
},
{0, 1, 2, 0, /* 0x8e */
{{1, 3},
{7, 7},
{0, 0},
{0, 0}
}
},
{1, 1, 2, 0, /* 0x8f */
{{0, 3},
{7, 7},
{0, 0},
{0, 0}
}
},
{0, 1, 2, 0, /* 0x90 */
{{4, 4},
{7, 7},
{0, 0},
{0, 0}
}
},
{1, 1, 3, 0, /* 0x91 */
{{0, 0},
{4, 4},
{7, 7},
{0, 0}
}
},
{0, 1, 3, 0, /* 0x92 */
{{1, 1},
{4, 4},
{7, 7},
{0, 0}
}
},
{1, 1, 3, 0, /* 0x93 */
{{0, 1},
{4, 4},
{7, 7},
{0, 0}
}
},
{0, 1, 3, 0, /* 0x94 */
{{2, 2},
{4, 4},
{7, 7},
{0, 0}
}
},
{1, 1, 4, 0, /* 0x95 */
{{0, 0},
{2, 2},
{4, 4},
{7, 7}
}
},
{0, 1, 3, 0, /* 0x96 */
{{1, 2},
{4, 4},
{7, 7},
{0, 0}
}
},
{1, 1, 3, 0, /* 0x97 */
{{0, 2},
{4, 4},
{7, 7},
{0, 0}
}
},
{0, 1, 2, 0, /* 0x98 */
{{3, 4},
{7, 7},
{0, 0},
{0, 0}
}
},
{1, 1, 3, 0, /* 0x99 */
{{0, 0},
{3, 4},
{7, 7},
{0, 0}
}
},
{0, 1, 3, 0, /* 0x9a */
{{1, 1},
{3, 4},
{7, 7},
{0, 0}
}
},
{1, 1, 3, 0, /* 0x9b */
{{0, 1},
{3, 4},
{7, 7},
{0, 0}
}
},
{0, 1, 2, 0, /* 0x9c */
{{2, 4},
{7, 7},
{0, 0},
{0, 0}
}
},
{1, 1, 3, 0, /* 0x9d */
{{0, 0},
{2, 4},
{7, 7},
{0, 0}
}
},
{0, 1, 2, 0, /* 0x9e */
{{1, 4},
{7, 7},
{0, 0},
{0, 0}
}
},
{1, 1, 2, 0, /* 0x9f */
{{0, 4},
{7, 7},
{0, 0},
{0, 0}
}
},
{0, 1, 2, 0, /* 0xa0 */
{{5, 5},
{7, 7},
{0, 0},
{0, 0}
}
},
{1, 1, 3, 0, /* 0xa1 */
{{0, 0},
{5, 5},
{7, 7},
{0, 0}
}
},
{0, 1, 3, 0, /* 0xa2 */
{{1, 1},
{5, 5},
{7, 7},
{0, 0}
}
},
{1, 1, 3, 0, /* 0xa3 */
{{0, 1},
{5, 5},
{7, 7},
{0, 0}
}
},
{0, 1, 3, 0, /* 0xa4 */
{{2, 2},
{5, 5},
{7, 7},
{0, 0}
}
},
{1, 1, 4, 0, /* 0xa5 */
{{0, 0},
{2, 2},
{5, 5},
{7, 7}
}
},
{0, 1, 3, 0, /* 0xa6 */
{{1, 2},
{5, 5},
{7, 7},
{0, 0}
}
},
{1, 1, 3, 0, /* 0xa7 */
{{0, 2},
{5, 5},
{7, 7},
{0, 0}
}
},
{0, 1, 3, 0, /* 0xa8 */
{{3, 3},
{5, 5},
{7, 7},
{0, 0}
}
},
{1, 1, 4, 0, /* 0xa9 */
{{0, 0},
{3, 3},
{5, 5},
{7, 7}
}
},
{0, 1, 4, 0, /* 0xaa */
{{1, 1},
{3, 3},
{5, 5},
{7, 7}
}
},
{1, 1, 4, 0, /* 0xab */
{{0, 1},
{3, 3},
{5, 5},
{7, 7}
}
},
{0, 1, 3, 0, /* 0xac */
{{2, 3},
{5, 5},
{7, 7},
{0, 0}
}
},
{1, 1, 4, 0, /* 0xad */
{{0, 0},
{2, 3},
{5, 5},
{7, 7}
}
},
{0, 1, 3, 0, /* 0xae */
{{1, 3},
{5, 5},
{7, 7},
{0, 0}
}
},
{1, 1, 3, 0, /* 0xaf */
{{0, 3},
{5, 5},
{7, 7},
{0, 0}
}
},
{0, 1, 2, 0, /* 0xb0 */
{{4, 5},
{7, 7},
{0, 0},
{0, 0}
}
},
{1, 1, 3, 0, /* 0xb1 */
{{0, 0},
{4, 5},
{7, 7},
{0, 0}
}
},
{0, 1, 3, 0, /* 0xb2 */
{{1, 1},
{4, 5},
{7, 7},
{0, 0}
}
},
{1, 1, 3, 0, /* 0xb3 */
{{0, 1},
{4, 5},
{7, 7},
{0, 0}
}
},
{0, 1, 3, 0, /* 0xb4 */
{{2, 2},
{4, 5},
{7, 7},
{0, 0}
}
},
{1, 1, 4, 0, /* 0xb5 */
{{0, 0},
{2, 2},
{4, 5},
{7, 7}
}
},
{0, 1, 3, 0, /* 0xb6 */
{{1, 2},
{4, 5},
{7, 7},
{0, 0}
}
},
{1, 1, 3, 0, /* 0xb7 */
{{0, 2},
{4, 5},
{7, 7},
{0, 0}
}
},
{0, 1, 2, 0, /* 0xb8 */
{{3, 5},
{7, 7},
{0, 0},
{0, 0}
}
},
{1, 1, 3, 0, /* 0xb9 */
{{0, 0},
{3, 5},
{7, 7},
{0, 0}
}
},
{0, 1, 3, 0, /* 0xba */
{{1, 1},
{3, 5},
{7, 7},
{0, 0}
}
},
{1, 1, 3, 0, /* 0xbb */
{{0, 1},
{3, 5},
{7, 7},
{0, 0}
}
},
{0, 1, 2, 0, /* 0xbc */
{{2, 5},
{7, 7},
{0, 0},
{0, 0}
}
},
{1, 1, 3, 0, /* 0xbd */
{{0, 0},
{2, 5},
{7, 7},
{0, 0}
}
},
{0, 1, 2, 0, /* 0xbe */
{{1, 5},
{7, 7},
{0, 0},
{0, 0}
}
},
{1, 1, 2, 0, /* 0xbf */
{{0, 5},
{7, 7},
{0, 0},
{0, 0}
}
},
{0, 1, 1, 0, /* 0xc0 */
{{6, 7},
{0, 0},
{0, 0},
{0, 0}
}
},
{1, 1, 2, 0, /* 0xc1 */
{{0, 0},
{6, 7},
{0, 0},
{0, 0}
}
},
{0, 1, 2, 0, /* 0xc2 */
{{1, 1},
{6, 7},
{0, 0},
{0, 0}
}
},
{1, 1, 2, 0, /* 0xc3 */
{{0, 1},
{6, 7},
{0, 0},
{0, 0}
}
},
{0, 1, 2, 0, /* 0xc4 */
{{2, 2},
{6, 7},
{0, 0},
{0, 0}
}
},
{1, 1, 3, 0, /* 0xc5 */
{{0, 0},
{2, 2},
{6, 7},
{0, 0}
}
},
{0, 1, 2, 0, /* 0xc6 */
{{1, 2},
{6, 7},
{0, 0},
{0, 0}
}
},
{1, 1, 2, 0, /* 0xc7 */
{{0, 2},
{6, 7},
{0, 0},
{0, 0}
}
},
{0, 1, 2, 0, /* 0xc8 */
{{3, 3},
{6, 7},
{0, 0},
{0, 0}
}
},
{1, 1, 3, 0, /* 0xc9 */
{{0, 0},
{3, 3},
{6, 7},
{0, 0}
}
},
{0, 1, 3, 0, /* 0xca */
{{1, 1},
{3, 3},
{6, 7},
{0, 0}
}
},
{1, 1, 3, 0, /* 0xcb */
{{0, 1},
{3, 3},
{6, 7},
{0, 0}
}
},
{0, 1, 2, 0, /* 0xcc */
{{2, 3},
{6, 7},
{0, 0},
{0, 0}
}
},
{1, 1, 3, 0, /* 0xcd */
{{0, 0},
{2, 3},
{6, 7},
{0, 0}
}
},
{0, 1, 2, 0, /* 0xce */
{{1, 3},
{6, 7},
{0, 0},
{0, 0}
}
},
{1, 1, 2, 0, /* 0xcf */
{{0, 3},
{6, 7},
{0, 0},
{0, 0}
}
},
{0, 1, 2, 0, /* 0xd0 */
{{4, 4},
{6, 7},
{0, 0},
{0, 0}
}
},
{1, 1, 3, 0, /* 0xd1 */
{{0, 0},
{4, 4},
{6, 7},
{0, 0}
}
},
{0, 1, 3, 0, /* 0xd2 */
{{1, 1},
{4, 4},
{6, 7},
{0, 0}
}
},
{1, 1, 3, 0, /* 0xd3 */
{{0, 1},
{4, 4},
{6, 7},
{0, 0}
}
},
{0, 1, 3, 0, /* 0xd4 */
{{2, 2},
{4, 4},
{6, 7},
{0, 0}
}
},
{1, 1, 4, 0, /* 0xd5 */
{{0, 0},
{2, 2},
{4, 4},
{6, 7}
}
},
{0, 1, 3, 0, /* 0xd6 */
{{1, 2},
{4, 4},
{6, 7},
{0, 0}
}
},
{1, 1, 3, 0, /* 0xd7 */
{{0, 2},
{4, 4},
{6, 7},
{0, 0}
}
},
{0, 1, 2, 0, /* 0xd8 */
{{3, 4},
{6, 7},
{0, 0},
{0, 0}
}
},
{1, 1, 3, 0, /* 0xd9 */
{{0, 0},
{3, 4},
{6, 7},
{0, 0}
}
},
{0, 1, 3, 0, /* 0xda */
{{1, 1},
{3, 4},
{6, 7},
{0, 0}
}
},
{1, 1, 3, 0, /* 0xdb */
{{0, 1},
{3, 4},
{6, 7},
{0, 0}
}
},
{0, 1, 2, 0, /* 0xdc */
{{2, 4},
{6, 7},
{0, 0},
{0, 0}
}
},
{1, 1, 3, 0, /* 0xdd */
{{0, 0},
{2, 4},
{6, 7},
{0, 0}
}
},
{0, 1, 2, 0, /* 0xde */
{{1, 4},
{6, 7},
{0, 0},
{0, 0}
}
},
{1, 1, 2, 0, /* 0xdf */
{{0, 4},
{6, 7},
{0, 0},
{0, 0}
}
},
{0, 1, 1, 0, /* 0xe0 */
{{5, 7},
{0, 0},
{0, 0},
{0, 0}
}
},
{1, 1, 2, 0, /* 0xe1 */
{{0, 0},
{5, 7},
{0, 0},
{0, 0}
}
},
{0, 1, 2, 0, /* 0xe2 */
{{1, 1},
{5, 7},
{0, 0},
{0, 0}
}
},
{1, 1, 2, 0, /* 0xe3 */
{{0, 1},
{5, 7},
{0, 0},
{0, 0}
}
},
{0, 1, 2, 0, /* 0xe4 */
{{2, 2},
{5, 7},
{0, 0},
{0, 0}
}
},
{1, 1, 3, 0, /* 0xe5 */
{{0, 0},
{2, 2},
{5, 7},
{0, 0}
}
},
{0, 1, 2, 0, /* 0xe6 */
{{1, 2},
{5, 7},
{0, 0},
{0, 0}
}
},
{1, 1, 2, 0, /* 0xe7 */
{{0, 2},
{5, 7},
{0, 0},
{0, 0}
}
},
{0, 1, 2, 0, /* 0xe8 */
{{3, 3},
{5, 7},
{0, 0},
{0, 0}
}
},
{1, 1, 3, 0, /* 0xe9 */
{{0, 0},
{3, 3},
{5, 7},
{0, 0}
}
},
{0, 1, 3, 0, /* 0xea */
{{1, 1},
{3, 3},
{5, 7},
{0, 0}
}
},
{1, 1, 3, 0, /* 0xeb */
{{0, 1},
{3, 3},
{5, 7},
{0, 0}
}
},
{0, 1, 2, 0, /* 0xec */
{{2, 3},
{5, 7},
{0, 0},
{0, 0}
}
},
{1, 1, 3, 0, /* 0xed */
{{0, 0},
{2, 3},
{5, 7},
{0, 0}
}
},
{0, 1, 2, 0, /* 0xee */
{{1, 3},
{5, 7},
{0, 0},
{0, 0}
}
},
{1, 1, 2, 0, /* 0xef */
{{0, 3},
{5, 7},
{0, 0},
{0, 0}
}
},
{0, 1, 1, 0, /* 0xf0 */
{{4, 7},
{0, 0},
{0, 0},
{0, 0}
}
},
{1, 1, 2, 0, /* 0xf1 */
{{0, 0},
{4, 7},
{0, 0},
{0, 0}
}
},
{0, 1, 2, 0, /* 0xf2 */
{{1, 1},
{4, 7},
{0, 0},
{0, 0}
}
},
{1, 1, 2, 0, /* 0xf3 */
{{0, 1},
{4, 7},
{0, 0},
{0, 0}
}
},
{0, 1, 2, 0, /* 0xf4 */
{{2, 2},
{4, 7},
{0, 0},
{0, 0}
}
},
{1, 1, 3, 0, /* 0xf5 */
{{0, 0},
{2, 2},
{4, 7},
{0, 0}
}
},
{0, 1, 2, 0, /* 0xf6 */
{{1, 2},
{4, 7},
{0, 0},
{0, 0}
}
},
{1, 1, 2, 0, /* 0xf7 */
{{0, 2},
{4, 7},
{0, 0},
{0, 0}
}
},
{0, 1, 1, 0, /* 0xf8 */
{{3, 7},
{0, 0},
{0, 0},
{0, 0}
}
},
{1, 1, 2, 0, /* 0xf9 */
{{0, 0},
{3, 7},
{0, 0},
{0, 0}
}
},
{0, 1, 2, 0, /* 0xfa */
{{1, 1},
{3, 7},
{0, 0},
{0, 0}
}
},
{1, 1, 2, 0, /* 0xfb */
{{0, 1},
{3, 7},
{0, 0},
{0, 0}
}
},
{0, 1, 1, 0, /* 0xfc */
{{2, 7},
{0, 0},
{0, 0},
{0, 0}
}
},
{1, 1, 2, 0, /* 0xfd */
{{0, 0},
{2, 7},
{0, 0},
{0, 0}
}
},
{0, 1, 1, 0, /* 0xfe */
{{1, 7},
{0, 0},
{0, 0},
{0, 0}
}
},
{1, 1, 1, 0, /* 0xff */
{{0, 7},
{0, 0},
{0, 0},
{0, 0}
}
}
};
extern int sctp_peer_chunk_oh;
static int
sctp_find_cmsg(int c_type, void *data, struct mbuf *control, int cpsize)
{
struct cmsghdr cmh;
int tlen, at;
tlen = control->m_len;
at = 0;
/*
* Independent of how many mbufs, find the c_type inside the control
* structure and copy out the data.
*/
while (at < tlen) {
if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
/* not enough room for one more we are done. */
return (0);
}
m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
if ((cmh.cmsg_len + at) > tlen) {
/*
* this is real messed up since there is not enough
* data here to cover the cmsg header. We are done.
*/
return (0);
}
if ((cmh.cmsg_level == IPPROTO_SCTP) &&
(c_type == cmh.cmsg_type)) {
/* found the one we want, copy it out */
at += CMSG_ALIGN(sizeof(struct cmsghdr));
if ((int)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < cpsize) {
/*
* space of cmsg_len after header not big
* enough
*/
return (0);
}
m_copydata(control, at, cpsize, data);
return (1);
} else {
at += CMSG_ALIGN(cmh.cmsg_len);
if (cmh.cmsg_len == 0) {
break;
}
}
}
/* not found */
return (0);
}
extern int sctp_mbuf_threshold_count;
__inline struct mbuf *
sctp_get_mbuf_for_msg(unsigned int space_needed, int want_header,
int how, int allonebuf, int type)
{
struct mbuf *m = NULL;
int aloc_size;
int index = 0;
int mbuf_threshold;
if (want_header) {
MGETHDR(m, how, type);
} else {
MGET(m, how, type);
}
if (m == NULL) {
return (NULL);
}
if (allonebuf == 0)
mbuf_threshold = sctp_mbuf_threshold_count;
else
mbuf_threshold = 1;
if (space_needed > (((mbuf_threshold - 1) * MLEN) + MHLEN)) {
try_again:
index = 4;
if (space_needed <= MCLBYTES) {
aloc_size = MCLBYTES;
} else if (space_needed <= MJUMPAGESIZE) {
aloc_size = MJUMPAGESIZE;
index = 5;
} else if (space_needed <= MJUM9BYTES) {
aloc_size = MJUM9BYTES;
index = 6;
} else {
aloc_size = MJUM16BYTES;
index = 7;
}
m_cljget(m, how, aloc_size);
if (m == NULL) {
return (NULL);
}
if ((m->m_flags & M_EXT) == 0) {
if ((aloc_size != MCLBYTES) &&
(allonebuf == 0)) {
aloc_size -= 10;
goto try_again;
}
sctp_m_freem(m);
return (NULL);
}
}
m->m_len = 0;
m->m_next = m->m_nextpkt = NULL;
#ifdef SCTP_MBUF_LOGGING
if (m->m_flags & M_EXT) {
sctp_log_mb(m, SCTP_MBUF_IALLOC);
}
#endif
if (want_header) {
m->m_pkthdr.len = 0;
}
return (m);
}
static struct mbuf *
sctp_add_cookie(struct sctp_inpcb *inp, struct mbuf *init, int init_offset,
struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in)
{
struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
struct sctp_state_cookie *stc;
struct sctp_paramhdr *ph;
uint8_t *signature;
int sig_offset;
uint16_t cookie_sz;
mret = NULL;
mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
sizeof(struct sctp_paramhdr)), 0, M_DONTWAIT, 1, MT_DATA);
if (mret == NULL) {
return (NULL);
}
copy_init = sctp_m_copym(init, init_offset, M_COPYALL, M_DONTWAIT);
if (copy_init == NULL) {
sctp_m_freem(mret);
return (NULL);
}
copy_initack = sctp_m_copym(initack, initack_offset, M_COPYALL,
M_DONTWAIT);
if (copy_initack == NULL) {
sctp_m_freem(mret);
sctp_m_freem(copy_init);
return (NULL);
}
/* easy side we just drop it on the end */
ph = mtod(mret, struct sctp_paramhdr *);
mret->m_len = sizeof(struct sctp_state_cookie) +
sizeof(struct sctp_paramhdr);
stc = (struct sctp_state_cookie *)((caddr_t)ph +
sizeof(struct sctp_paramhdr));
ph->param_type = htons(SCTP_STATE_COOKIE);
ph->param_length = 0; /* fill in at the end */
/* Fill in the stc cookie data */
*stc = *stc_in;
/* tack the INIT and then the INIT-ACK onto the chain */
cookie_sz = 0;
m_at = mret;
for (m_at = mret; m_at; m_at = m_at->m_next) {
cookie_sz += m_at->m_len;
if (m_at->m_next == NULL) {
m_at->m_next = copy_init;
break;
}
}
for (m_at = copy_init; m_at; m_at = m_at->m_next) {
cookie_sz += m_at->m_len;
if (m_at->m_next == NULL) {
m_at->m_next = copy_initack;
break;
}
}
for (m_at = copy_initack; m_at; m_at = m_at->m_next) {
cookie_sz += m_at->m_len;
if (m_at->m_next == NULL) {
break;
}
}
sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_DONTWAIT, 1, MT_DATA);
if (sig == NULL) {
/* no space, so free the entire chain */
sctp_m_freem(mret);
return (NULL);
}
sig->m_len = 0;
m_at->m_next = sig;
sig_offset = 0;
signature = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
/* Time to sign the cookie */
sctp_hmac_m(SCTP_HMAC,
(uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
SCTP_SECRET_SIZE, mret, sizeof(struct sctp_paramhdr),
(uint8_t *) signature);
sig->m_len += SCTP_SIGNATURE_SIZE;
cookie_sz += SCTP_SIGNATURE_SIZE;
ph->param_length = htons(cookie_sz);
return (mret);
}
static __inline uint8_t
sctp_get_ect(struct sctp_tcb *stcb,
struct sctp_tmit_chunk *chk)
{
uint8_t this_random;
/* Huh? */
if (sctp_ecn_enable == 0)
return (0);
if (sctp_ecn_nonce == 0)
/* no nonce, always return ECT0 */
return (SCTP_ECT0_BIT);
if (stcb->asoc.peer_supports_ecn_nonce == 0) {
/* Peer does NOT support it, so we send a ECT0 only */
return (SCTP_ECT0_BIT);
}
if (chk == NULL)
return (SCTP_ECT0_BIT);
if (((stcb->asoc.hb_random_idx == 3) &&
(stcb->asoc.hb_ect_randombit > 7)) ||
(stcb->asoc.hb_random_idx > 3)) {
uint32_t rndval;
rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
memcpy(stcb->asoc.hb_random_values, &rndval,
sizeof(stcb->asoc.hb_random_values));
this_random = stcb->asoc.hb_random_values[0];
stcb->asoc.hb_random_idx = 0;
stcb->asoc.hb_ect_randombit = 0;
} else {
if (stcb->asoc.hb_ect_randombit > 7) {
stcb->asoc.hb_ect_randombit = 0;
stcb->asoc.hb_random_idx++;
}
this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
}
if ((this_random >> stcb->asoc.hb_ect_randombit) & 0x01) {
if (chk != NULL)
/* ECN Nonce stuff */
chk->rec.data.ect_nonce = SCTP_ECT1_BIT;
stcb->asoc.hb_ect_randombit++;
return (SCTP_ECT1_BIT);
} else {
stcb->asoc.hb_ect_randombit++;
return (SCTP_ECT0_BIT);
}
}
extern int sctp_no_csum_on_loopback;
static int
sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
struct sctp_tcb *stcb, /* may be NULL */
struct sctp_nets *net,
struct sockaddr *to,
struct mbuf *m,
uint32_t auth_offset,
struct sctp_auth_chunk *auth,
int nofragment_flag,
int ecn_ok,
struct sctp_tmit_chunk *chk,
int out_of_asoc_ok)
/* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
{
/*
* Given a mbuf chain (via m_next) that holds a packet header WITH a
* SCTPHDR but no IP header, endpoint inp and sa structure. - fill
* in the HMAC digest of any AUTH chunk in the packet - calculate
* SCTP checksum and fill in - prepend a IP address header - if
* boundall use INADDR_ANY - if boundspecific do source address
* selection - set fragmentation option for ipV4 - On return from IP
* output, check/adjust mtu size - of output interface and
* smallest_mtu size as well.
*/
struct sctphdr *sctphdr;
int o_flgs;
uint32_t csum;
int ret;
unsigned int have_mtu;
struct route *ro;
if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
sctp_m_freem(m);
return (EFAULT);
}
if ((m->m_flags & M_PKTHDR) == 0) {
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_OUTPUT1) {
printf("Software error: sctp_lowlevel_chunk_output() called with non pkthdr!\n");
}
#endif
sctp_m_freem(m);
return (EFAULT);
}
/* fill in the HMAC digest for any AUTH chunk in the packet */
if ((auth != NULL) && (stcb != NULL)) {
sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb);
}
/* Calculate the csum and fill in the length of the packet */
sctphdr = mtod(m, struct sctphdr *);
have_mtu = 0;
if (sctp_no_csum_on_loopback &&
(stcb) &&
(stcb->asoc.loopback_scope)) {
sctphdr->checksum = 0;
/*
* This can probably now be taken out since my audit shows
* no more bad pktlen's coming in. But we will wait a while
* yet.
*/
m->m_pkthdr.len = sctp_calculate_len(m);
} else {
sctphdr->checksum = 0;
csum = sctp_calculate_sum(m, &m->m_pkthdr.len, 0);
sctphdr->checksum = csum;
}
if (to->sa_family == AF_INET) {
struct ip *ip;
struct route iproute;
uint8_t tos_value;
M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
if (m == NULL) {
/* failed to prepend data, give up */
return (ENOMEM);
}
ip = mtod(m, struct ip *);
ip->ip_v = IPVERSION;
ip->ip_hl = (sizeof(struct ip) >> 2);
if (net) {
tos_value = net->tos_flowlabel & 0x000000ff;
} else {
tos_value = inp->ip_inp.inp.inp_ip_tos;
}
if (nofragment_flag) {
#if defined(WITH_CONVERT_IP_OFF) || defined(__FreeBSD__) || defined(__APPLE__)
ip->ip_off = IP_DF;
#else
ip->ip_off = htons(IP_DF);
#endif
} else
ip->ip_off = 0;
/* FreeBSD has a function for ip_id's */
ip->ip_id = ip_newid();
ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
ip->ip_len = m->m_pkthdr.len;
if (stcb) {
if ((stcb->asoc.ecn_allowed) && ecn_ok) {
/* Enable ECN */
ip->ip_tos = ((u_char)(tos_value & 0xfc) | sctp_get_ect(stcb, chk));
} else {
/* No ECN */
ip->ip_tos = (u_char)(tos_value & 0xfc);
}
} else {
/* no association at all */
ip->ip_tos = (tos_value & 0xfc);
}
ip->ip_p = IPPROTO_SCTP;
ip->ip_sum = 0;
if (net == NULL) {
ro = &iproute;
memset(&iproute, 0, sizeof(iproute));
memcpy(&ro->ro_dst, to, to->sa_len);
} else {
ro = (struct route *)&net->ro;
}
/* Now the address selection part */
ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
/* call the routine to select the src address */
if (net) {
if (net->src_addr_selected == 0) {
/* Cache the source address */
((struct sockaddr_in *)&net->ro._s_addr)->sin_addr = sctp_ipv4_source_address_selection(inp,
stcb,
ro, net, out_of_asoc_ok);
if (ro->ro_rt)
net->src_addr_selected = 1;
}
ip->ip_src = ((struct sockaddr_in *)&net->ro._s_addr)->sin_addr;
} else {
ip->ip_src = sctp_ipv4_source_address_selection(inp,
stcb, ro, net, out_of_asoc_ok);
}
/*
* If source address selection fails and we find no route
* then the ip_ouput should fail as well with a
* NO_ROUTE_TO_HOST type error. We probably should catch
* that somewhere and abort the association right away
* (assuming this is an INIT being sent).
*/
if ((ro->ro_rt == NULL)) {
/*
* src addr selection failed to find a route (or
* valid source addr), so we can't get there from
* here!
*/
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_OUTPUT1) {
printf("low_level_output: dropped v4 packet- no valid source addr\n");
printf("Destination was %x\n", (uint32_t) (ntohl(ip->ip_dst.s_addr)));
}
#endif /* SCTP_DEBUG */
if (net) {
if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb)
sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
stcb,
SCTP_FAILED_THRESHOLD,
(void *)net);
net->dest_state &= ~SCTP_ADDR_REACHABLE;
net->dest_state |= SCTP_ADDR_NOT_REACHABLE;
if (stcb) {
if (net == stcb->asoc.primary_destination) {
/* need a new primary */
struct sctp_nets *alt;
alt = sctp_find_alternate_net(stcb, net, 0);
if (alt != net) {
if (sctp_set_primary_addr(stcb,
(struct sockaddr *)NULL,
alt) == 0) {
net->dest_state |= SCTP_ADDR_WAS_PRIMARY;
net->src_addr_selected = 0;
}
}
}
}
}
sctp_m_freem(m);
return (EHOSTUNREACH);
} else {
have_mtu = ro->ro_rt->rt_ifp->if_mtu;
}
if (inp->sctp_socket) {
o_flgs = (IP_RAWOUTPUT | (inp->sctp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST)));
} else {
o_flgs = IP_RAWOUTPUT;
}
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_OUTPUT3) {
printf("Calling ipv4 output routine from low level src addr:%x\n",
(uint32_t) (ntohl(ip->ip_src.s_addr)));
printf("Destination is %x\n", (uint32_t) (ntohl(ip->ip_dst.s_addr)));
printf("RTP route is %p through\n", ro->ro_rt);
}
#endif
if ((have_mtu) && (net) && (have_mtu > net->mtu)) {
ro->ro_rt->rt_ifp->if_mtu = net->mtu;
}
if (ro != &iproute) {
memcpy(&iproute, ro, sizeof(*ro));
}
ret = ip_output(m, inp->ip_inp.inp.inp_options,
ro, o_flgs, inp->ip_inp.inp.inp_moptions
,(struct inpcb *)NULL
);
if ((ro->ro_rt) && (have_mtu) && (net) && (have_mtu > net->mtu)) {
ro->ro_rt->rt_ifp->if_mtu = have_mtu;
}
SCTP_STAT_INCR(sctps_sendpackets);
SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
if (ret)
SCTP_STAT_INCR(sctps_senderrors);
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_OUTPUT3) {
printf("Ip output returns %d\n", ret);
}
#endif
if (net == NULL) {
/* free tempy routes */
if (ro->ro_rt)
RTFREE(ro->ro_rt);
} else {
/* PMTU check versus smallest asoc MTU goes here */
if (ro->ro_rt != NULL) {
if (ro->ro_rt->rt_rmx.rmx_mtu &&
(stcb->asoc.smallest_mtu > ro->ro_rt->rt_rmx.rmx_mtu)) {
sctp_mtu_size_reset(inp, &stcb->asoc,
ro->ro_rt->rt_rmx.rmx_mtu);
}
} else {
/* route was freed */
net->src_addr_selected = 0;
}
}
return (ret);
}
#ifdef INET6
else if (to->sa_family == AF_INET6) {
uint32_t flowlabel;
struct ip6_hdr *ip6h;
struct route_in6 ip6route;
struct ifnet *ifp;
u_char flowTop;
uint16_t flowBottom;
u_char tosBottom, tosTop;
struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
struct sockaddr_in6 lsa6_storage;
int prev_scope = 0;
int error;
u_short prev_port = 0;
if (net != NULL) {
flowlabel = net->tos_flowlabel;
} else {
flowlabel = ((struct in6pcb *)inp)->in6p_flowinfo;
}
M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT);
if (m == NULL) {
/* failed to prepend data, give up */
return (ENOMEM);
}
ip6h = mtod(m, struct ip6_hdr *);
/*
* We assume here that inp_flow is in host byte order within
* the TCB!
*/
flowBottom = flowlabel & 0x0000ffff;
flowTop = ((flowlabel & 0x000f0000) >> 16);
tosTop = (((flowlabel & 0xf0) >> 4) | IPV6_VERSION);
/* protect *sin6 from overwrite */
sin6 = (struct sockaddr_in6 *)to;
tmp = *sin6;
sin6 = &tmp;
/* KAME hack: embed scopeid */
if (sa6_embedscope(sin6, ip6_use_defzone) != 0)
return (EINVAL);
if (net == NULL) {
memset(&ip6route, 0, sizeof(ip6route));
ro = (struct route *)&ip6route;
memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
} else {
ro = (struct route *)&net->ro;
}
if (stcb != NULL) {
if ((stcb->asoc.ecn_allowed) && ecn_ok) {
/* Enable ECN */
tosBottom = (((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) | sctp_get_ect(stcb, chk)) << 4);
} else {
/* No ECN */
tosBottom = ((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) << 4);
}
} else {
/* we could get no asoc if it is a O-O-T-B packet */
tosBottom = ((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) << 4);
}
ip6h->ip6_flow = htonl(((tosTop << 24) | ((tosBottom | flowTop) << 16) | flowBottom));
ip6h->ip6_nxt = IPPROTO_SCTP;
ip6h->ip6_plen = m->m_pkthdr.len;
ip6h->ip6_dst = sin6->sin6_addr;
/*
* Add SRC address selection here: we can only reuse to a
* limited degree the kame src-addr-sel, since we can try
* their selection but it may not be bound.
*/
bzero(&lsa6_tmp, sizeof(lsa6_tmp));
lsa6_tmp.sin6_family = AF_INET6;
lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
lsa6 = &lsa6_tmp;
if (net) {
if (net->src_addr_selected == 0) {
/* Cache the source address */
((struct sockaddr_in6 *)&net->ro._s_addr)->sin6_addr = sctp_ipv6_source_address_selection(inp,
stcb, ro, net, out_of_asoc_ok);
if (ro->ro_rt)
net->src_addr_selected = 1;
}
lsa6->sin6_addr = ((struct sockaddr_in6 *)&net->ro._s_addr)->sin6_addr;
} else {
lsa6->sin6_addr = sctp_ipv6_source_address_selection(
inp, stcb, ro, net, out_of_asoc_ok);
}
lsa6->sin6_port = inp->sctp_lport;
if ((ro->ro_rt == NULL)) {
/*
* src addr selection failed to find a route (or
* valid source addr), so we can't get there from
* here!
*/
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_OUTPUT1) {
printf("low_level_output: dropped v6 pkt- no valid source addr\n");
}
#endif
sctp_m_freem(m);
if (net) {
if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb)
sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
stcb,
SCTP_FAILED_THRESHOLD,
(void *)net);
net->dest_state &= ~SCTP_ADDR_REACHABLE;
net->dest_state |= SCTP_ADDR_NOT_REACHABLE;
if (stcb) {
if (net == stcb->asoc.primary_destination) {
/* need a new primary */
struct sctp_nets *alt;
alt = sctp_find_alternate_net(stcb, net, 0);
if (alt != net) {
if (sctp_set_primary_addr(stcb,
(struct sockaddr *)NULL,
alt) == 0) {
net->dest_state |= SCTP_ADDR_WAS_PRIMARY;
net->src_addr_selected = 0;
}
}
}
}
}
return (EHOSTUNREACH);
}
/*
* XXX: sa6 may not have a valid sin6_scope_id in the
* non-SCOPEDROUTING case.
*/
bzero(&lsa6_storage, sizeof(lsa6_storage));
lsa6_storage.sin6_family = AF_INET6;
lsa6_storage.sin6_len = sizeof(lsa6_storage);
if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
sctp_m_freem(m);
return (error);
}
/* XXX */
lsa6_storage.sin6_addr = lsa6->sin6_addr;
lsa6_storage.sin6_port = inp->sctp_lport;
lsa6 = &lsa6_storage;
ip6h->ip6_src = lsa6->sin6_addr;
/*
* We set the hop limit now since there is a good chance
* that our ro pointer is now filled
*/
ip6h->ip6_hlim = in6_selecthlim((struct in6pcb *)&inp->ip_inp.inp,
(ro ?
(ro->ro_rt ? (ro->ro_rt->rt_ifp) : (NULL)) :
(NULL)));
o_flgs = 0;
ifp = ro->ro_rt->rt_ifp;
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_OUTPUT3) {
/* Copy to be sure something bad is not happening */
sin6->sin6_addr = ip6h->ip6_dst;
lsa6->sin6_addr = ip6h->ip6_src;
printf("Calling ipv6 output routine from low level\n");
printf("src: ");
sctp_print_address((struct sockaddr *)lsa6);
printf("dst: ");
sctp_print_address((struct sockaddr *)sin6);
}
#endif /* SCTP_DEBUG */
if (net) {
sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
/* preserve the port and scope for link local send */
prev_scope = sin6->sin6_scope_id;
prev_port = sin6->sin6_port;
}
ret = ip6_output(m, ((struct in6pcb *)inp)->in6p_outputopts,
(struct route_in6 *)ro,
o_flgs,
((struct in6pcb *)inp)->in6p_moptions,
&ifp
,NULL
);
if (net) {
/* for link local this must be done */
sin6->sin6_scope_id = prev_scope;
sin6->sin6_port = prev_port;
}
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_OUTPUT3) {
printf("return from send is %d\n", ret);
}
#endif /* SCTP_DEBUG_OUTPUT */
SCTP_STAT_INCR(sctps_sendpackets);
SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
if (ret)
SCTP_STAT_INCR(sctps_senderrors);
if (net == NULL) {
/* Now if we had a temp route free it */
if (ro->ro_rt) {
RTFREE(ro->ro_rt);
}
} else {
/* PMTU check versus smallest asoc MTU goes here */
if (ro->ro_rt == NULL) {
/* Route was freed */
net->src_addr_selected = 0;
}
if (ro->ro_rt != NULL) {
if (ro->ro_rt->rt_rmx.rmx_mtu &&
(stcb->asoc.smallest_mtu > ro->ro_rt->rt_rmx.rmx_mtu)) {
sctp_mtu_size_reset(inp,
&stcb->asoc,
ro->ro_rt->rt_rmx.rmx_mtu);
}
} else if (ifp) {
if (ND_IFINFO(ifp)->linkmtu &&
(stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
sctp_mtu_size_reset(inp,
&stcb->asoc,
ND_IFINFO(ifp)->linkmtu);
}
}
}
return (ret);
}
#endif
else {
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_OUTPUT1) {
printf("Unknown protocol (TSNH) type %d\n", ((struct sockaddr *)to)->sa_family);
}
#endif
sctp_m_freem(m);
return (EFAULT);
}
}
void
sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb)
{
struct mbuf *m, *m_at, *m_last;
struct sctp_nets *net;
struct sctp_init_msg *initm;
struct sctp_supported_addr_param *sup_addr;
struct sctp_ecn_supported_param *ecn;
struct sctp_prsctp_supported_param *prsctp;
struct sctp_ecn_nonce_supported_param *ecn_nonce;
struct sctp_supported_chunk_types_param *pr_supported;
int cnt_inits_to = 0;
int padval, ret;
int num_ext;
int p_len;
/* INIT's always go to the primary (and usually ONLY address) */
m_last = NULL;
net = stcb->asoc.primary_destination;
if (net == NULL) {
net = TAILQ_FIRST(&stcb->asoc.nets);
if (net == NULL) {
/* TSNH */
return;
}
/* we confirm any address we send an INIT to */
net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
sctp_set_primary_addr(stcb, NULL, net);
} else {
/* we confirm any address we send an INIT to */
net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
}
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_OUTPUT4) {
printf("Sending INIT\n");
}
#endif
if (((struct sockaddr *)&(net->ro._l_addr))->sa_family == AF_INET6) {
/*
* special hook, if we are sending to link local it will not
* show up in our private address count.
*/
struct sockaddr_in6 *sin6l;
sin6l = &net->ro._l_addr.sin6;
if (IN6_IS_ADDR_LINKLOCAL(&sin6l->sin6_addr))
cnt_inits_to = 1;
}
if (callout_pending(&net->rxt_timer.timer)) {
/* This case should not happen */
return;
}
/* start the INIT timer */
if (sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net)) {
/* we are hosed since I can't start the INIT timer? */
return;
}
m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
if (m == NULL) {
/* No memory, INIT timer will re-attempt. */
return;
}
m->m_pkthdr.len = 0;
m->m_data += SCTP_MIN_OVERHEAD;
m->m_len = sizeof(struct sctp_init_msg);
/* Now lets put the SCTP header in place */
initm = mtod(m, struct sctp_init_msg *);
initm->sh.src_port = inp->sctp_lport;
initm->sh.dest_port = stcb->rport;
initm->sh.v_tag = 0;
initm->sh.checksum = 0; /* calculate later */
/* now the chunk header */
initm->msg.ch.chunk_type = SCTP_INITIATION;
initm->msg.ch.chunk_flags = 0;
/* fill in later from mbuf we build */
initm->msg.ch.chunk_length = 0;
/* place in my tag */
initm->msg.init.initiate_tag = htonl(stcb->asoc.my_vtag);
/* set up some of the credits. */
initm->msg.init.a_rwnd = htonl(max(inp->sctp_socket->so_rcv.sb_hiwat,
SCTP_MINIMAL_RWND));
initm->msg.init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
initm->msg.init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
initm->msg.init.initial_tsn = htonl(stcb->asoc.init_seq_number);
/* now the address restriction */
sup_addr = (struct sctp_supported_addr_param *)((caddr_t)initm +
sizeof(*initm));
sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
/* we support 2 types IPv6/IPv4 */
sup_addr->ph.param_length = htons(sizeof(*sup_addr) +
sizeof(uint16_t));
sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
sup_addr->addr_type[1] = htons(SCTP_IPV6_ADDRESS);
m->m_len += sizeof(*sup_addr) + sizeof(uint16_t);
if (inp->sctp_ep.adaptation_layer_indicator) {
struct sctp_adaptation_layer_indication *ali;
ali = (struct sctp_adaptation_layer_indication *)(
(caddr_t)sup_addr + sizeof(*sup_addr) + sizeof(uint16_t));
ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
ali->ph.param_length = htons(sizeof(*ali));
ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
m->m_len += sizeof(*ali);
ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali +
sizeof(*ali));
} else {
ecn = (struct sctp_ecn_supported_param *)((caddr_t)sup_addr +
sizeof(*sup_addr) + sizeof(uint16_t));
}
/* now any cookie time extensions */
if (stcb->asoc.cookie_preserve_req) {
struct sctp_cookie_perserve_param *cookie_preserve;
cookie_preserve = (struct sctp_cookie_perserve_param *)(ecn);
cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
cookie_preserve->ph.param_length = htons(
sizeof(*cookie_preserve));
cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
m->m_len += sizeof(*cookie_preserve);
ecn = (struct sctp_ecn_supported_param *)(
(caddr_t)cookie_preserve + sizeof(*cookie_preserve));
stcb->asoc.cookie_preserve_req = 0;
}
/* ECN parameter */
if (sctp_ecn_enable == 1) {
ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
ecn->ph.param_length = htons(sizeof(*ecn));
m->m_len += sizeof(*ecn);
prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
sizeof(*ecn));
} else {
prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
}
/* And now tell the peer we do pr-sctp */
prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
prsctp->ph.param_length = htons(sizeof(*prsctp));
m->m_len += sizeof(*prsctp);
/* And now tell the peer we do all the extensions */
pr_supported = (struct sctp_supported_chunk_types_param *)
((caddr_t)prsctp + sizeof(*prsctp));
pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
num_ext = 0;
pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
if (!sctp_auth_disable)
pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
p_len = sizeof(*pr_supported) + num_ext;
pr_supported->ph.param_length = htons(p_len);
bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
m->m_len += SCTP_SIZE32(p_len);
/* ECN nonce: And now tell the peer we support ECN nonce */
if (sctp_ecn_nonce) {
ecn_nonce = (struct sctp_ecn_nonce_supported_param *)
((caddr_t)pr_supported + SCTP_SIZE32(p_len));
ecn_nonce->ph.param_type = htons(SCTP_ECN_NONCE_SUPPORTED);
ecn_nonce->ph.param_length = htons(sizeof(*ecn_nonce));
m->m_len += sizeof(*ecn_nonce);
}
/* add authentication parameters */
if (!sctp_auth_disable) {
struct sctp_auth_random *random;
struct sctp_auth_hmac_algo *hmacs;
struct sctp_auth_chunk_list *chunks;
/* attach RANDOM parameter, if available */
if (stcb->asoc.authinfo.random != NULL) {
random = (struct sctp_auth_random *)(mtod(m, caddr_t)+m->m_len);
random->ph.param_type = htons(SCTP_RANDOM);
p_len = sizeof(*random) + stcb->asoc.authinfo.random_len;
random->ph.param_length = htons(p_len);
bcopy(stcb->asoc.authinfo.random->key, random->random_data,
stcb->asoc.authinfo.random_len);
/* zero out any padding required */
bzero((caddr_t)random + p_len, SCTP_SIZE32(p_len) - p_len);
m->m_len += SCTP_SIZE32(p_len);
}
/* add HMAC_ALGO parameter */
hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+m->m_len);
p_len = sctp_serialize_hmaclist(stcb->asoc.local_hmacs,
(uint8_t *) hmacs->hmac_ids);
if (p_len > 0) {
p_len += sizeof(*hmacs);
hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
hmacs->ph.param_length = htons(p_len);
/* zero out any padding required */
bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
m->m_len += SCTP_SIZE32(p_len);
}
/* add CHUNKS parameter */
chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+m->m_len);
p_len = sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks,
chunks->chunk_types);
if (p_len > 0) {
p_len += sizeof(*chunks);
chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
chunks->ph.param_length = htons(p_len);
/* zero out any padding required */
bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
m->m_len += SCTP_SIZE32(p_len);
}
}
m_at = m;
/* now the addresses */
{
struct sctp_scoping scp;
/*
* To optimize this we could put the scoping stuff into a
* structure and remove the individual uint8's from the
* assoc structure. Then we could just pass in the address
* within the stcb.. but for now this is a quick hack to get
* the address stuff teased apart.
*/
scp.ipv4_addr_legal = stcb->asoc.ipv4_addr_legal;
scp.ipv6_addr_legal = stcb->asoc.ipv6_addr_legal;
scp.loopback_scope = stcb->asoc.loopback_scope;
scp.ipv4_local_scope = stcb->asoc.ipv4_local_scope;
scp.local_scope = stcb->asoc.local_scope;
scp.site_scope = stcb->asoc.site_scope;
m_at = sctp_add_addresses_to_i_ia(inp, &scp, m_at, cnt_inits_to);
}
/* calulate the size and update pkt header and chunk header */
m->m_pkthdr.len = 0;
for (m_at = m; m_at; m_at = m_at->m_next) {
if (m_at->m_next == NULL)
m_last = m_at;
m->m_pkthdr.len += m_at->m_len;
}
initm->msg.ch.chunk_length = htons((m->m_pkthdr.len -
sizeof(struct sctphdr)));
/*
* We pass 0 here to NOT set IP_DF if its IPv4, we ignore the return
* here since the timer will drive a retranmission.
*/
/* I don't expect this to execute but we will be safe here */
padval = m->m_pkthdr.len % 4;
if ((padval) && (m_last)) {
/*
* The compiler worries that m_last may not be set even
* though I think it is impossible :-> however we add m_last
* here just in case.
*/
int ret;
ret = sctp_add_pad_tombuf(m_last, (4 - padval));
if (ret) {
/* Houston we have a problem, no space */
sctp_m_freem(m);
return;
}
m->m_pkthdr.len += padval;
}
ret = sctp_lowlevel_chunk_output(inp, stcb, net,
(struct sockaddr *)&net->ro._l_addr,
m, 0, NULL, 0, 0, NULL, 0);
SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
}
struct mbuf *
sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
int param_offset, int *abort_processing, struct sctp_chunkhdr *cp)
{
/*
* Given a mbuf containing an INIT or INIT-ACK with the param_offset
* being equal to the beginning of the params i.e. (iphlen +
* sizeof(struct sctp_init_msg) parse through the parameters to the
* end of the mbuf verifying that all parameters are known.
*
* For unknown parameters build and return a mbuf with
* UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
* processing this chunk stop, and set *abort_processing to 1.
*
* By having param_offset be pre-set to where parameters begin it is
* hoped that this routine may be reused in the future by new
* features.
*/
struct sctp_paramhdr *phdr, params;
struct mbuf *mat, *op_err;
char tempbuf[2048];
int at, limit, pad_needed;
uint16_t ptype, plen;
int err_at;
*abort_processing = 0;
mat = in_initpkt;
err_at = 0;
limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
at = param_offset;
op_err = NULL;
phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
ptype = ntohs(phdr->param_type);
plen = ntohs(phdr->param_length);
limit -= SCTP_SIZE32(plen);
if (plen < sizeof(struct sctp_paramhdr)) {
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_OUTPUT4) {
printf("sctp_output.c:Impossible length in parameter < %d\n", plen);
}
#endif
*abort_processing = 1;
break;
}
/*
* All parameters for all chunks that we know/understand are
* listed here. We process them other places and make
* appropriate stop actions per the upper bits. However this
* is the generic routine processor's can call to get back
* an operr.. to either incorporate (init-ack) or send.
*/
if ((ptype == SCTP_HEARTBEAT_INFO) ||
(ptype == SCTP_IPV4_ADDRESS) ||
(ptype == SCTP_IPV6_ADDRESS) ||
(ptype == SCTP_STATE_COOKIE) ||
(ptype == SCTP_UNRECOG_PARAM) ||
(ptype == SCTP_COOKIE_PRESERVE) ||
(ptype == SCTP_SUPPORTED_ADDRTYPE) ||
(ptype == SCTP_PRSCTP_SUPPORTED) ||
(ptype == SCTP_ADD_IP_ADDRESS) ||
(ptype == SCTP_DEL_IP_ADDRESS) ||
(ptype == SCTP_ECN_CAPABLE) ||
(ptype == SCTP_ULP_ADAPTATION) ||
(ptype == SCTP_ERROR_CAUSE_IND) ||
(ptype == SCTP_RANDOM) ||
(ptype == SCTP_CHUNK_LIST) ||
(ptype == SCTP_CHUNK_LIST) ||
(ptype == SCTP_SET_PRIM_ADDR) ||
(ptype == SCTP_SUCCESS_REPORT) ||
(ptype == SCTP_ULP_ADAPTATION) ||
(ptype == SCTP_SUPPORTED_CHUNK_EXT) ||
(ptype == SCTP_ECN_NONCE_SUPPORTED)
) {
/* no skip it */
at += SCTP_SIZE32(plen);
} else if (ptype == SCTP_HOSTNAME_ADDRESS) {
/* We can NOT handle HOST NAME addresses!! */
int l_len;
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_OUTPUT4) {
printf("Can't handle hostname addresses.. abort processing\n");
}
#endif
*abort_processing = 1;
if (op_err == NULL) {
/* Ok need to try to get a mbuf */
l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
l_len += plen;
l_len += sizeof(struct sctp_paramhdr);
op_err = sctp_get_mbuf_for_msg(l_len, 1, M_DONTWAIT, 1, MT_DATA);
if (op_err) {
op_err->m_len = 0;
op_err->m_pkthdr.len = 0;
/*
* pre-reserve space for ip and sctp
* header and chunk hdr
*/
op_err->m_data += sizeof(struct ip6_hdr);
op_err->m_data += sizeof(struct sctphdr);
op_err->m_data += sizeof(struct sctp_chunkhdr);
}
}
if (op_err) {
/* If we have space */
struct sctp_paramhdr s;
if (err_at % 4) {
uint32_t cpthis = 0;
pad_needed = 4 - (err_at % 4);
m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
err_at += pad_needed;
}
s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
s.param_length = htons(sizeof(s) + plen);
m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
err_at += sizeof(s);
phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, plen);
if (phdr == NULL) {
sctp_m_freem(op_err);
/*
* we are out of memory but we still
* need to have a look at what to do
* (the system is in trouble
* though).
*/
return (NULL);
}
m_copyback(op_err, err_at, plen, (caddr_t)phdr);
err_at += plen;
}
return (op_err);
} else {
/*
* we do not recognize the parameter figure out what
* we do.
*/
if ((ptype & 0x4000) == 0x4000) {
/* Report bit is set?? */
if (op_err == NULL) {
int l_len;
/* Ok need to try to get an mbuf */
l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
l_len += plen;
l_len += sizeof(struct sctp_paramhdr);
op_err = sctp_get_mbuf_for_msg(l_len, 1, M_DONTWAIT, 1, MT_DATA);
if (op_err) {
op_err->m_len = 0;
op_err->m_pkthdr.len = 0;
op_err->m_data += sizeof(struct ip6_hdr);
op_err->m_data += sizeof(struct sctphdr);
op_err->m_data += sizeof(struct sctp_chunkhdr);
}
}
if (op_err) {
/* If we have space */
struct sctp_paramhdr s;
if (err_at % 4) {
uint32_t cpthis = 0;
pad_needed = 4 - (err_at % 4);
m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
err_at += pad_needed;
}
s.param_type = htons(SCTP_UNRECOG_PARAM);
s.param_length = htons(sizeof(s) + plen);
m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
err_at += sizeof(s);
if (plen > sizeof(tempbuf)) {
plen = sizeof(tempbuf);
}
phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, plen);
if (phdr == NULL) {
sctp_m_freem(op_err);
/*
* we are out of memory but
* we still need to have a
* look at what to do (the
* system is in trouble
* though).
*/
goto more_processing;
}
m_copyback(op_err, err_at, plen, (caddr_t)phdr);
err_at += plen;
}
}
more_processing:
if ((ptype & 0x8000) == 0x0000) {
return (op_err);
} else {
/* skip this chunk and continue processing */
at += SCTP_SIZE32(plen);
}
}
phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
}
return (op_err);
}
static int
sctp_are_there_new_addresses(struct sctp_association *asoc,
struct mbuf *in_initpkt, int iphlen, int offset)
{
/*
* Given a INIT packet, look through the packet to verify that there
* are NO new addresses. As we go through the parameters add reports
* of any un-understood parameters that require an error. Also we
* must return (1) to drop the packet if we see a un-understood
* parameter that tells us to drop the chunk.
*/
struct sockaddr_in sin4, *sa4;
struct sockaddr_in6 sin6, *sa6;
struct sockaddr *sa_touse;
struct sockaddr *sa;
struct sctp_paramhdr *phdr, params;
struct ip *iph;
struct mbuf *mat;
uint16_t ptype, plen;
int err_at;
uint8_t fnd;
struct sctp_nets *net;
memset(&sin4, 0, sizeof(sin4));
memset(&sin6, 0, sizeof(sin6));
sin4.sin_family = AF_INET;
sin4.sin_len = sizeof(sin4);
sin6.sin6_family = AF_INET6;
sin6.sin6_len = sizeof(sin6);
sa_touse = NULL;
/* First what about the src address of the pkt ? */
iph = mtod(in_initpkt, struct ip *);
if (iph->ip_v == IPVERSION) {
/* source addr is IPv4 */
sin4.sin_addr = iph->ip_src;
sa_touse = (struct sockaddr *)&sin4;
} else if (iph->ip_v == (IPV6_VERSION >> 4)) {
/* source addr is IPv6 */
struct ip6_hdr *ip6h;
ip6h = mtod(in_initpkt, struct ip6_hdr *);
sin6.sin6_addr = ip6h->ip6_src;
sa_touse = (struct sockaddr *)&sin6;
} else {
return (1);
}
fnd = 0;
TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
sa = (struct sockaddr *)&net->ro._l_addr;
if (sa->sa_family == sa_touse->sa_family) {
if (sa->sa_family == AF_INET) {
sa4 = (struct sockaddr_in *)sa;
if (sa4->sin_addr.s_addr ==
sin4.sin_addr.s_addr) {
fnd = 1;
break;
}
} else if (sa->sa_family == AF_INET6) {
sa6 = (struct sockaddr_in6 *)sa;
if (SCTP6_ARE_ADDR_EQUAL(&sa6->sin6_addr,
&sin6.sin6_addr)) {
fnd = 1;
break;
}
}
}
}
if (fnd == 0) {
/* New address added! no need to look futher. */
return (1);
}
/* Ok so far lets munge through the rest of the packet */
mat = in_initpkt;
err_at = 0;
sa_touse = NULL;
offset += sizeof(struct sctp_init_chunk);
phdr = sctp_get_next_param(mat, offset, &params, sizeof(params));
while (phdr) {
ptype = ntohs(phdr->param_type);
plen = ntohs(phdr->param_length);
if (ptype == SCTP_IPV4_ADDRESS) {
struct sctp_ipv4addr_param *p4, p4_buf;
phdr = sctp_get_next_param(mat, offset,
(struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
if (plen != sizeof(struct sctp_ipv4addr_param) ||
phdr == NULL) {
return (1);
}
p4 = (struct sctp_ipv4addr_param *)phdr;
sin4.sin_addr.s_addr = p4->addr;
sa_touse = (struct sockaddr *)&sin4;
} else if (ptype == SCTP_IPV6_ADDRESS) {
struct sctp_ipv6addr_param *p6, p6_buf;
phdr = sctp_get_next_param(mat, offset,
(struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
if (plen != sizeof(struct sctp_ipv6addr_param) ||
phdr == NULL) {
return (1);
}
p6 = (struct sctp_ipv6addr_param *)phdr;
memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
sizeof(p6->addr));
sa_touse = (struct sockaddr *)&sin4;
}
if (sa_touse) {
/* ok, sa_touse points to one to check */
fnd = 0;
TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
sa = (struct sockaddr *)&net->ro._l_addr;
if (sa->sa_family != sa_touse->sa_family) {
continue;
}
if (sa->sa_family == AF_INET) {
sa4 = (struct sockaddr_in *)sa;
if (sa4->sin_addr.s_addr ==
sin4.sin_addr.s_addr) {
fnd = 1;
break;
}
} else if (sa->sa_family == AF_INET6) {
sa6 = (struct sockaddr_in6 *)sa;
if (SCTP6_ARE_ADDR_EQUAL(
&sa6->sin6_addr, &sin6.sin6_addr)) {
fnd = 1;
break;
}
}
}
if (!fnd) {
/* New addr added! no need to look further */
return (1);
}
}
offset += SCTP_SIZE32(plen);
phdr = sctp_get_next_param(mat, offset, &params, sizeof(params));
}
return (0);
}
/*
* Given a MBUF chain that was sent into us containing an INIT. Build a
* INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
* a pullup to include IPv6/4header, SCTP header and initial part of INIT
* message (i.e. the struct sctp_init_msg).
*/
void
sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
struct mbuf *init_pkt, int iphlen, int offset, struct sctphdr *sh,
struct sctp_init_chunk *init_chk)
{
struct sctp_association *asoc;
struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *m_last;
struct sctp_init_msg *initackm_out;
struct sctp_ecn_supported_param *ecn;
struct sctp_prsctp_supported_param *prsctp;
struct sctp_ecn_nonce_supported_param *ecn_nonce;
struct sctp_supported_chunk_types_param *pr_supported;
struct sockaddr_storage store;
struct sockaddr_in *sin;
struct sockaddr_in6 *sin6;
struct route *ro;
struct ip *iph;
struct ip6_hdr *ip6;
struct sockaddr *to;
struct sctp_state_cookie stc;
struct sctp_nets *net = NULL;
int cnt_inits_to = 0;
uint16_t his_limit, i_want;
int abort_flag, padval, sz_of;
int num_ext;
int p_len;
if (stcb) {
asoc = &stcb->asoc;
} else {
asoc = NULL;
}
m_last = NULL;
if ((asoc != NULL) &&
(SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
(sctp_are_there_new_addresses(asoc, init_pkt, iphlen, offset))) {
/* new addresses, out of here in non-cookie-wait states */
/*
* Send a ABORT, we don't add the new address error clause
* though we even set the T bit and copy in the 0 tag.. this
* looks no different than if no listener was present.
*/
sctp_send_abort(init_pkt, iphlen, sh, 0, NULL);
return;
}
abort_flag = 0;
op_err = sctp_arethere_unrecognized_parameters(init_pkt,
(offset + sizeof(struct sctp_init_chunk)),
&abort_flag, (struct sctp_chunkhdr *)init_chk);
if (abort_flag) {
sctp_send_abort(init_pkt, iphlen, sh, init_chk->init.initiate_tag, op_err);
return;
}
m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
if (m == NULL) {
/* No memory, INIT timer will re-attempt. */
if (op_err)
sctp_m_freem(op_err);
return;
}
m->m_data += SCTP_MIN_OVERHEAD;
m->m_pkthdr.rcvif = 0;
m->m_len = sizeof(struct sctp_init_msg);
/* the time I built cookie */
SCTP_GETTIME_TIMEVAL(&stc.time_entered);
/* populate any tie tags */
if (asoc != NULL) {
/* unlock before tag selections */
stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
stc.cookie_life = asoc->cookie_life;
net = asoc->primary_destination;
} else {
stc.tie_tag_my_vtag = 0;
stc.tie_tag_peer_vtag = 0;
/* life I will award this cookie */
stc.cookie_life = inp->sctp_ep.def_cookie_life;
}
/* copy in the ports for later check */
stc.myport = sh->dest_port;
stc.peerport = sh->src_port;
/*
* If we wanted to honor cookie life extentions, we would add to
* stc.cookie_life. For now we should NOT honor any extension
*/
stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
struct inpcb *in_inp;
/* Its a V6 socket */
in_inp = (struct inpcb *)inp;
stc.ipv6_addr_legal = 1;
/* Now look at the binding flag to see if V4 will be legal */
if (
(in_inp->inp_flags & IN6P_IPV6_V6ONLY)
== 0) {
stc.ipv4_addr_legal = 1;
} else {
/* V4 addresses are NOT legal on the association */
stc.ipv4_addr_legal = 0;
}
} else {
/* Its a V4 socket, no - V6 */
stc.ipv4_addr_legal = 1;
stc.ipv6_addr_legal = 0;
}
#ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
stc.ipv4_scope = 1;
#else
stc.ipv4_scope = 0;
#endif
/* now for scope setup */
memset((caddr_t)&store, 0, sizeof(store));
sin = (struct sockaddr_in *)&store;
sin6 = (struct sockaddr_in6 *)&store;
if (net == NULL) {
to = (struct sockaddr *)&store;
iph = mtod(init_pkt, struct ip *);
if (iph->ip_v == IPVERSION) {
struct in_addr addr;
struct route iproute;
sin->sin_family = AF_INET;
sin->sin_len = sizeof(struct sockaddr_in);
sin->sin_port = sh->src_port;
sin->sin_addr = iph->ip_src;
/* lookup address */
stc.address[0] = sin->sin_addr.s_addr;
stc.address[1] = 0;
stc.address[2] = 0;
stc.address[3] = 0;
stc.addr_type = SCTP_IPV4_ADDRESS;
/* local from address */
memset(&iproute, 0, sizeof(iproute));
ro = &iproute;
memcpy(&ro->ro_dst, sin, sizeof(*sin));
addr = sctp_ipv4_source_address_selection(inp, NULL,
ro, NULL, 0);
if (ro->ro_rt) {
RTFREE(ro->ro_rt);
}
stc.laddress[0] = addr.s_addr;
stc.laddress[1] = 0;
stc.laddress[2] = 0;
stc.laddress[3] = 0;
stc.laddr_type = SCTP_IPV4_ADDRESS;
/* scope_id is only for v6 */
stc.scope_id = 0;
#ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
if (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
stc.ipv4_scope = 1;
}
#else
stc.ipv4_scope = 1;
#endif /* SCTP_DONT_DO_PRIVADDR_SCOPE */
/* Must use the address in this case */
if (sctp_is_address_on_local_host((struct sockaddr *)sin)) {
stc.loopback_scope = 1;
stc.ipv4_scope = 1;
stc.site_scope = 1;
stc.local_scope = 1;
}
} else if (iph->ip_v == (IPV6_VERSION >> 4)) {
struct in6_addr addr;
struct route_in6 iproute6;
ip6 = mtod(init_pkt, struct ip6_hdr *);
sin6->sin6_family = AF_INET6;
sin6->sin6_len = sizeof(struct sockaddr_in6);
sin6->sin6_port = sh->src_port;
sin6->sin6_addr = ip6->ip6_src;
/* lookup address */
memcpy(&stc.address, &sin6->sin6_addr,
sizeof(struct in6_addr));
sin6->sin6_scope_id = 0;
stc.addr_type = SCTP_IPV6_ADDRESS;
stc.scope_id = 0;
if (sctp_is_address_on_local_host((struct sockaddr *)sin6)) {
stc.loopback_scope = 1;
stc.local_scope = 1;
stc.site_scope = 1;
stc.ipv4_scope = 1;
} else if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
/*
* If the new destination is a LINK_LOCAL we
* must have common both site and local
* scope. Don't set local scope though since
* we must depend on the source to be added
* implicitly. We cannot assure just because
* we share one link that all links are
* common.
*/
stc.local_scope = 0;
stc.site_scope = 1;
stc.ipv4_scope = 1;
/*
* we start counting for the private address
* stuff at 1. since the link local we
* source from won't show up in our scoped
* count.
*/
cnt_inits_to = 1;
/* pull out the scope_id from incoming pkt */
/* FIX ME: does this have scope from rcvif? */
(void)sa6_recoverscope(sin6);
sa6_embedscope(sin6, ip6_use_defzone);
stc.scope_id = sin6->sin6_scope_id;
} else if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) {
/*
* If the new destination is SITE_LOCAL then
* we must have site scope in common.
*/
stc.site_scope = 1;
}
/* local from address */
memset(&iproute6, 0, sizeof(iproute6));
ro = (struct route *)&iproute6;
memcpy(&ro->ro_dst, sin6, sizeof(*sin6));
addr = sctp_ipv6_source_address_selection(inp, NULL,
ro, NULL, 0);
if (ro->ro_rt) {
RTFREE(ro->ro_rt);
}
memcpy(&stc.laddress, &addr, sizeof(struct in6_addr));
stc.laddr_type = SCTP_IPV6_ADDRESS;
}
} else {
/* set the scope per the existing tcb */
struct sctp_nets *lnet;
stc.loopback_scope = asoc->loopback_scope;
stc.ipv4_scope = asoc->ipv4_local_scope;
stc.site_scope = asoc->site_scope;
stc.local_scope = asoc->local_scope;
TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
/*
* if we have a LL address, start
* counting at 1.
*/
cnt_inits_to = 1;
}
}
}
/* use the net pointer */
to = (struct sockaddr *)&net->ro._l_addr;
if (to->sa_family == AF_INET) {
sin = (struct sockaddr_in *)to;
stc.address[0] = sin->sin_addr.s_addr;
stc.address[1] = 0;
stc.address[2] = 0;
stc.address[3] = 0;
stc.addr_type = SCTP_IPV4_ADDRESS;
if (net->src_addr_selected == 0) {
/*
* strange case here, the INIT should have
* did the selection.
*/
net->ro._s_addr.sin.sin_addr =
sctp_ipv4_source_address_selection(inp,
stcb, (struct route *)&net->ro, net, 0);
net->src_addr_selected = 1;
}
stc.laddress[0] = net->ro._s_addr.sin.sin_addr.s_addr;
stc.laddress[1] = 0;
stc.laddress[2] = 0;
stc.laddress[3] = 0;
stc.laddr_type = SCTP_IPV4_ADDRESS;
} else if (to->sa_family == AF_INET6) {
sin6 = (struct sockaddr_in6 *)to;
memcpy(&stc.address, &sin6->sin6_addr,
sizeof(struct in6_addr));
stc.addr_type = SCTP_IPV6_ADDRESS;
if (net->src_addr_selected == 0) {
/*
* strange case here, the INIT should have
* did the selection.
*/
net->ro._s_addr.sin6.sin6_addr =
sctp_ipv6_source_address_selection(inp,
stcb, (struct route *)&net->ro, net, 0);
net->src_addr_selected = 1;
}
memcpy(&stc.laddress, &net->ro._l_addr.sin6.sin6_addr,
sizeof(struct in6_addr));
stc.laddr_type = SCTP_IPV6_ADDRESS;
}
}
/* Now lets put the SCTP header in place */
initackm_out = mtod(m, struct sctp_init_msg *);
initackm_out->sh.src_port = inp->sctp_lport;
initackm_out->sh.dest_port = sh->src_port;
initackm_out->sh.v_tag = init_chk->init.initiate_tag;
/* Save it off for quick ref */
stc.peers_vtag = init_chk->init.initiate_tag;
initackm_out->sh.checksum = 0; /* calculate later */
/* who are we */
memcpy(stc.identification, SCTP_VERSION_STRING,
min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
/* now the chunk header */
initackm_out->msg.ch.chunk_type = SCTP_INITIATION_ACK;
initackm_out->msg.ch.chunk_flags = 0;
/* fill in later from mbuf we build */
initackm_out->msg.ch.chunk_length = 0;
/* place in my tag */
if ((asoc != NULL) &&
((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
(SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
(SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
/* re-use the v-tags and init-seq here */
initackm_out->msg.init.initiate_tag = htonl(asoc->my_vtag);
initackm_out->msg.init.initial_tsn = htonl(asoc->init_seq_number);
} else {
if (asoc) {
atomic_add_int(&asoc->refcnt, 1);
SCTP_TCB_UNLOCK(stcb);
initackm_out->msg.init.initiate_tag = htonl(sctp_select_a_tag(inp));
/* get a TSN to use too */
initackm_out->msg.init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
SCTP_TCB_LOCK(stcb);
atomic_add_int(&asoc->refcnt, -1);
} else {
initackm_out->msg.init.initiate_tag = htonl(sctp_select_a_tag(inp));
/* get a TSN to use too */
initackm_out->msg.init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
}
}
/* save away my tag to */
stc.my_vtag = initackm_out->msg.init.initiate_tag;
/* set up some of the credits. */
initackm_out->msg.init.a_rwnd = htonl(max(inp->sctp_socket->so_rcv.sb_hiwat, SCTP_MINIMAL_RWND));
/* set what I want */
his_limit = ntohs(init_chk->init.num_inbound_streams);
/* choose what I want */
if (asoc != NULL) {
if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
i_want = asoc->streamoutcnt;
} else {
i_want = inp->sctp_ep.pre_open_stream_count;
}
} else {
i_want = inp->sctp_ep.pre_open_stream_count;
}
if (his_limit < i_want) {
/* I Want more :< */
initackm_out->msg.init.num_outbound_streams = init_chk->init.num_inbound_streams;
} else {
/* I can have what I want :> */
initackm_out->msg.init.num_outbound_streams = htons(i_want);
}
/* tell him his limt. */
initackm_out->msg.init.num_inbound_streams =
htons(inp->sctp_ep.max_open_streams_intome);
/* setup the ECN pointer */
if (inp->sctp_ep.adaptation_layer_indicator) {
struct sctp_adaptation_layer_indication *ali;
ali = (struct sctp_adaptation_layer_indication *)(
(caddr_t)initackm_out + sizeof(*initackm_out));
ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
ali->ph.param_length = htons(sizeof(*ali));
ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
m->m_len += sizeof(*ali);
ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali +
sizeof(*ali));
} else {
ecn = (struct sctp_ecn_supported_param *)(
(caddr_t)initackm_out + sizeof(*initackm_out));
}
/* ECN parameter */
if (sctp_ecn_enable == 1) {
ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
ecn->ph.param_length = htons(sizeof(*ecn));
m->m_len += sizeof(*ecn);
prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
sizeof(*ecn));
} else {
prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
}
/* And now tell the peer we do pr-sctp */
prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
prsctp->ph.param_length = htons(sizeof(*prsctp));
m->m_len += sizeof(*prsctp);
/* And now tell the peer we do all the extensions */
pr_supported = (struct sctp_supported_chunk_types_param *)
((caddr_t)prsctp + sizeof(*prsctp));
pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
num_ext = 0;
pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
if (!sctp_auth_disable)
pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
p_len = sizeof(*pr_supported) + num_ext;
pr_supported->ph.param_length = htons(p_len);
bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
m->m_len += SCTP_SIZE32(p_len);
/* ECN nonce: And now tell the peer we support ECN nonce */
if (sctp_ecn_nonce) {
ecn_nonce = (struct sctp_ecn_nonce_supported_param *)
((caddr_t)pr_supported + SCTP_SIZE32(p_len));
ecn_nonce->ph.param_type = htons(SCTP_ECN_NONCE_SUPPORTED);
ecn_nonce->ph.param_length = htons(sizeof(*ecn_nonce));
m->m_len += sizeof(*ecn_nonce);
}
/* add authentication parameters */
if (!sctp_auth_disable) {
struct sctp_auth_random *random;
struct sctp_auth_hmac_algo *hmacs;
struct sctp_auth_chunk_list *chunks;
uint16_t random_len;
/* generate and add RANDOM parameter */
random_len = sctp_auth_random_len;
random = (struct sctp_auth_random *)(mtod(m, caddr_t)+m->m_len);
random->ph.param_type = htons(SCTP_RANDOM);
p_len = sizeof(*random) + random_len;
random->ph.param_length = htons(p_len);
sctp_read_random(random->random_data, random_len);
/* zero out any padding required */
bzero((caddr_t)random + p_len, SCTP_SIZE32(p_len) - p_len);
m->m_len += SCTP_SIZE32(p_len);
/* add HMAC_ALGO parameter */
hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+m->m_len);
p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
(uint8_t *) hmacs->hmac_ids);
if (p_len > 0) {
p_len += sizeof(*hmacs);
hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
hmacs->ph.param_length = htons(p_len);
/* zero out any padding required */
bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
m->m_len += SCTP_SIZE32(p_len);
}
/* add CHUNKS parameter */
chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+m->m_len);
p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
chunks->chunk_types);
if (p_len > 0) {
p_len += sizeof(*chunks);
chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
chunks->ph.param_length = htons(p_len);
/* zero out any padding required */
bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
m->m_len += SCTP_SIZE32(p_len);
}
}
m_at = m;
/* now the addresses */
{
struct sctp_scoping scp;
/*
* To optimize this we could put the scoping stuff into a
* structure and remove the individual uint8's from the stc
* structure. Then we could just pass in the address within
* the stc.. but for now this is a quick hack to get the
* address stuff teased apart.
*/
scp.ipv4_addr_legal = stc.ipv4_addr_legal;
scp.ipv6_addr_legal = stc.ipv6_addr_legal;
scp.loopback_scope = stc.loopback_scope;
scp.ipv4_local_scope = stc.ipv4_scope;
scp.local_scope = stc.local_scope;
scp.site_scope = stc.site_scope;
m_at = sctp_add_addresses_to_i_ia(inp, &scp, m_at, cnt_inits_to);
}
/* tack on the operational error if present */
if (op_err) {
if (op_err->m_pkthdr.len % 4) {
/* must add a pad to the param */
uint32_t cpthis = 0;
int padlen;
padlen = 4 - (op_err->m_pkthdr.len % 4);
m_copyback(op_err, op_err->m_pkthdr.len, padlen, (caddr_t)&cpthis);
}
while (m_at->m_next != NULL) {
m_at = m_at->m_next;
}
m_at->m_next = op_err;
while (m_at->m_next != NULL) {
m_at = m_at->m_next;
}
}
/* Get total size of init packet */
sz_of = SCTP_SIZE32(ntohs(init_chk->ch.chunk_length));
/* pre-calulate the size and update pkt header and chunk header */
m->m_pkthdr.len = 0;
for (m_tmp = m; m_tmp; m_tmp = m_tmp->m_next) {
m->m_pkthdr.len += m_tmp->m_len;
if (m_tmp->m_next == NULL) {
/* m_tmp should now point to last one */
break;
}
}
/*
* Figure now the size of the cookie. We know the size of the
* INIT-ACK. The Cookie is going to be the size of INIT, INIT-ACK,
* COOKIE-STRUCTURE and SIGNATURE.
*/
/*
* take our earlier INIT calc and add in the sz we just calculated
* minus the size of the sctphdr (its not included in chunk size
*/
/* add once for the INIT-ACK */
sz_of += (m->m_pkthdr.len - sizeof(struct sctphdr));
/* add a second time for the INIT-ACK in the cookie */
sz_of += (m->m_pkthdr.len - sizeof(struct sctphdr));
/* Now add the cookie header and cookie message struct */
sz_of += sizeof(struct sctp_state_cookie_param);
/* ...and add the size of our signature */
sz_of += SCTP_SIGNATURE_SIZE;
initackm_out->msg.ch.chunk_length = htons(sz_of);
/* Now we must build a cookie */
m_cookie = sctp_add_cookie(inp, init_pkt, offset, m,
sizeof(struct sctphdr), &stc);
if (m_cookie == NULL) {
/* memory problem */
sctp_m_freem(m);
return;
}
/* Now append the cookie to the end and update the space/size */
m_tmp->m_next = m_cookie;
for (; m_tmp; m_tmp = m_tmp->m_next) {
m->m_pkthdr.len += m_tmp->m_len;
if (m_tmp->m_next == NULL) {
/* m_tmp should now point to last one */
m_last = m_tmp;
break;
}
}
/*
* We pass 0 here to NOT set IP_DF if its IPv4, we ignore the return
* here since the timer will drive a retranmission.
*/
padval = m->m_pkthdr.len % 4;
if ((padval) && (m_last)) {
/* see my previous comments on m_last */
int ret;
ret = sctp_add_pad_tombuf(m_last, (4 - padval));
if (ret) {
/* Houston we have a problem, no space */
sctp_m_freem(m);
return;
}
m->m_pkthdr.len += padval;
}
sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
NULL, 0);
SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
}
void
sctp_insert_on_wheel(struct sctp_tcb *stcb,
struct sctp_association *asoc,
struct sctp_stream_out *strq, int holds_lock)
{
struct sctp_stream_out *stre, *strn;
if (holds_lock == 0)
SCTP_TCB_SEND_LOCK(stcb);
if ((strq->next_spoke.tqe_next) ||
(strq->next_spoke.tqe_prev)) {
/* already on wheel */
goto outof_here;
}
stre = TAILQ_FIRST(&asoc->out_wheel);
if (stre == NULL) {
/* only one on wheel */
TAILQ_INSERT_HEAD(&asoc->out_wheel, strq, next_spoke);
goto outof_here;
}
for (; stre; stre = strn) {
strn = TAILQ_NEXT(stre, next_spoke);
if (stre->stream_no > strq->stream_no) {
TAILQ_INSERT_BEFORE(stre, strq, next_spoke);
goto outof_here;
} else if (stre->stream_no == strq->stream_no) {
/* huh, should not happen */
goto outof_here;
} else if (strn == NULL) {
/* next one is null */
TAILQ_INSERT_AFTER(&asoc->out_wheel, stre, strq,
next_spoke);
}
}
outof_here:
if (holds_lock == 0)
SCTP_TCB_SEND_UNLOCK(stcb);
}
static void
sctp_remove_from_wheel(struct sctp_tcb *stcb,
struct sctp_association *asoc,
struct sctp_stream_out *strq)
{
/* take off and then setup so we know it is not on the wheel */
SCTP_TCB_SEND_LOCK(stcb);
if (TAILQ_FIRST(&strq->outqueue)) {
/* more was added */
SCTP_TCB_SEND_UNLOCK(stcb);
return;
}
TAILQ_REMOVE(&asoc->out_wheel, strq, next_spoke);
strq->next_spoke.tqe_next = NULL;
strq->next_spoke.tqe_prev = NULL;
SCTP_TCB_SEND_UNLOCK(stcb);
}
static void
sctp_prune_prsctp(struct sctp_tcb *stcb,
struct sctp_association *asoc,
struct sctp_sndrcvinfo *srcv,
int dataout)
{
int freed_spc = 0;
struct sctp_tmit_chunk *chk, *nchk;
SCTP_TCB_LOCK_ASSERT(stcb);
if ((asoc->peer_supports_prsctp) &&
(asoc->sent_queue_cnt_removeable > 0)) {
TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
/*
* Look for chunks marked with the PR_SCTP flag AND
* the buffer space flag. If the one being sent is
* equal or greater priority then purge the old one
* and free some space.
*/
if (PR_SCTP_BUF_ENABLED(chk->flags)) {
/*
* This one is PR-SCTP AND buffer space
* limited type
*/
if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
/*
* Lower numbers equates to higher
* priority so if the one we are
* looking at has a larger or equal
* priority we want to drop the data
* and NOT retransmit it.
*/
if (chk->data) {
/*
* We release the book_size
* if the mbuf is here
*/
int ret_spc;
int cause;
if (chk->sent > SCTP_DATAGRAM_UNSENT)
cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT;
else
cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT;
ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
cause,
&asoc->sent_queue);
freed_spc += ret_spc;
if (freed_spc >= dataout) {
return;
}
} /* if chunk was present */
} /* if of sufficent priority */
} /* if chunk has enabled */
} /* tailqforeach */
chk = TAILQ_FIRST(&asoc->send_queue);
while (chk) {
nchk = TAILQ_NEXT(chk, sctp_next);
/* Here we must move to the sent queue and mark */
if (PR_SCTP_TTL_ENABLED(chk->flags)) {
if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
if (chk->data) {
/*
* We release the book_size
* if the mbuf is here
*/
int ret_spc;
ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT,
&asoc->send_queue);
freed_spc += ret_spc;
if (freed_spc >= dataout) {
return;
}
} /* end if chk->data */
} /* end if right class */
} /* end if chk pr-sctp */
chk = nchk;
} /* end while (chk) */
} /* if enabled in asoc */
}
__inline int
sctp_get_frag_point(struct sctp_tcb *stcb,
struct sctp_association *asoc)
{
int siz, ovh;
/*
* For endpoints that have both v6 and v4 addresses we must reserve
* room for the ipv6 header, for those that are only dealing with V4
* we use a larger frag point.
*/
if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
ovh = SCTP_MED_OVERHEAD;
} else {
ovh = SCTP_MED_V4_OVERHEAD;
}
if (stcb->sctp_ep->sctp_frag_point > asoc->smallest_mtu)
siz = asoc->smallest_mtu - ovh;
else
siz = (stcb->sctp_ep->sctp_frag_point - ovh);
/*
* if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
*/
/* A data chunk MUST fit in a cluster */
/* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
/* } */
/* adjust for an AUTH chunk if DATA requires auth */
if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
if (siz % 4) {
/* make it an even word boundary please */
siz -= (siz % 4);
}
return (siz);
}
extern unsigned int sctp_max_chunks_on_queue;
static void
sctp_set_prsctp_policy(struct sctp_tcb *stcb,
struct sctp_stream_queue_pending *sp)
{
sp->pr_sctp_on = 0;
if (stcb->asoc.peer_supports_prsctp) {
/*
* We assume that the user wants PR_SCTP_TTL if the user
* provides a positive lifetime but does not specify any
* PR_SCTP policy. This is a BAD assumption and causes
* problems at least with the U-Vancovers MPI folks. I will
* change this to be no policy means NO PR-SCTP.
*/
if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
sp->pr_sctp_on = 1;
} else {
return;
}
switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
case CHUNK_FLAGS_PR_SCTP_BUF:
/*
* Time to live is a priority stored in tv_sec when
* doing the buffer drop thing.
*/
sp->ts.tv_sec = sp->timetolive;
sp->ts.tv_usec = 0;
break;
case CHUNK_FLAGS_PR_SCTP_TTL:
{
struct timeval tv;
SCTP_GETTIME_TIMEVAL(&sp->ts);
tv.tv_sec = sp->timetolive / 1000;
tv.tv_usec = (sp->timetolive * 1000) % 1000000;
timevaladd(&sp->ts, &tv);
}
break;
case CHUNK_FLAGS_PR_SCTP_RTX:
/*
* Time to live is a the number or retransmissions
* stored in tv_sec.
*/
sp->ts.tv_sec = sp->timetolive;
sp->ts.tv_usec = 0;
break;
default:
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_USRREQ1) {
printf("Unknown PR_SCTP policy %u.\n", PR_SCTP_POLICY(sp->sinfo_flags));
}
#endif
break;
}
}
}
static int
sctp_msg_append(struct sctp_tcb *stcb,
struct sctp_nets *net,
struct mbuf *m,
struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
{
int error = 0, holds_lock;
struct mbuf *at;
struct sctp_stream_queue_pending *sp = NULL;
struct sctp_stream_out *strm;
/*
* Given an mbuf chain, put it into the association send queue and
* place it on the wheel
*/
holds_lock = hold_stcb_lock;
if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
/* Invalid stream number */
error = EINVAL;
goto out_now;
}
if ((stcb->asoc.stream_locked) &&
(stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
error = EAGAIN;
goto out_now;
}
strm = &stcb->asoc.strmout[srcv->sinfo_stream];
/* Now can we send this? */
if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
(SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
(SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
(stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
/* got data while shutting down */
error = ECONNRESET;
goto out_now;
}
sp = (struct sctp_stream_queue_pending *)SCTP_ZONE_GET(sctppcbinfo.ipi_zone_strmoq);
if (sp == NULL) {
error = ENOMEM;
goto out_now;
}
SCTP_INCR_STRMOQ_COUNT();
sp->sinfo_flags = srcv->sinfo_flags;
sp->timetolive = srcv->sinfo_timetolive;
sp->ppid = srcv->sinfo_ppid;
sp->context = srcv->sinfo_context;
sp->strseq = 0;
if (sp->sinfo_flags & SCTP_ADDR_OVER) {
sp->net = net;
sp->addr_over = 1;
} else {
sp->net = stcb->asoc.primary_destination;
sp->addr_over = 0;
}
atomic_add_int(&sp->net->ref_count, 1);
SCTP_GETTIME_TIMEVAL(&sp->ts);
sp->stream = srcv->sinfo_stream;
sp->msg_is_complete = 1;
sp->some_taken = 0;
sp->data = m;
sp->tail_mbuf = NULL;
sp->length = 0;
at = m;
sctp_set_prsctp_policy(stcb, sp);
while (at) {
if (at->m_next == NULL)
sp->tail_mbuf = at;
sp->length += at->m_len;
at = at->m_next;
}
if (sp->data->m_flags & M_PKTHDR) {
sp->data->m_pkthdr.len = sp->length;
} else {
/* Get an HDR in front please */
at = sctp_get_mbuf_for_msg(1, 1, M_DONTWAIT, 1, MT_DATA);
if (at) {
at->m_pkthdr.len = sp->length;
at->m_len = 0;
at->m_next = sp->data;
sp->data = at;
}
}
SCTP_TCB_SEND_LOCK(stcb);
sctp_snd_sb_alloc(stcb, sp->length);
stcb->asoc.stream_queue_cnt++;
TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
sp->strseq = strm->next_sequence_sent;
strm->next_sequence_sent++;
}
if ((strm->next_spoke.tqe_next == NULL) &&
(strm->next_spoke.tqe_prev == NULL)) {
/* Not on wheel, insert */
sctp_insert_on_wheel(stcb, &stcb->asoc, strm, 1);
}
m = NULL;
SCTP_TCB_SEND_UNLOCK(stcb);
out_now:
if (m) {
sctp_m_freem(m);
}
return (error);
}
static struct mbuf *
sctp_copy_mbufchain(struct mbuf *clonechain,
struct mbuf *outchain,
struct mbuf **endofchain,
int can_take_mbuf,
int sizeofcpy,
uint8_t copy_by_ref)
{
struct mbuf *m;
struct mbuf *appendchain;
caddr_t cp;
int len;
if (endofchain == NULL) {
/* error */
error_out:
if (outchain)
sctp_m_freem(outchain);
return (NULL);
}
if (can_take_mbuf) {
appendchain = clonechain;
} else {
if (!copy_by_ref && (sizeofcpy <= ((((sctp_mbuf_threshold_count - 1) * MLEN) + MHLEN)))) {
/* Its not in a cluster */
if (*endofchain == NULL) {
/* lets get a mbuf cluster */
if (outchain == NULL) {
/* This is the general case */
new_mbuf:
outchain = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_HEADER);
if (outchain == NULL) {
goto error_out;
}
outchain->m_len = 0;
*endofchain = outchain;
/* get the prepend space */
outchain->m_data += (SCTP_FIRST_MBUF_RESV + 4);
} else {
/*
* We really should not get a NULL
* in endofchain
*/
/* find end */
m = outchain;
while (m) {
if (m->m_next == NULL) {
*endofchain = m;
break;
}
m = m->m_next;
}
/* sanity */
if (*endofchain == NULL) {
/*
* huh, TSNH XXX maybe we
* should panic
*/
sctp_m_freem(outchain);
goto new_mbuf;
}
}
/* get the new end of length */
len = M_TRAILINGSPACE(*endofchain);
} else {
/* how much is left at the end? */
len = M_TRAILINGSPACE(*endofchain);
}
/* Find the end of the data, for appending */
cp = (mtod((*endofchain), caddr_t)+(*endofchain)->m_len);
/* Now lets copy it out */
if (len >= sizeofcpy) {
/* It all fits, copy it in */
m_copydata(clonechain, 0, sizeofcpy, cp);
(*endofchain)->m_len += sizeofcpy;
if (outchain->m_flags & M_PKTHDR)
outchain->m_pkthdr.len += sizeofcpy;
} else {
/* fill up the end of the chain */
if (len > 0) {
m_copydata(clonechain, 0, len, cp);
(*endofchain)->m_len += len;
if (outchain->m_flags & M_PKTHDR)
outchain->m_pkthdr.len += len;
/* now we need another one */
sizeofcpy -= len;
}
m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_HEADER);
if (m == NULL) {
/* We failed */
goto error_out;
}
(*endofchain)->m_next = m;
*endofchain = m;
cp = mtod((*endofchain), caddr_t);
m_copydata(clonechain, len, sizeofcpy, cp);
(*endofchain)->m_len += sizeofcpy;
if (outchain->m_flags & M_PKTHDR) {
outchain->m_pkthdr.len += sizeofcpy;
}
}
return (outchain);
} else {
/* copy the old fashion way */
/*
* Supposedly m_copypacket is an optimization, use
* it if we can
*/
if (clonechain->m_flags & M_PKTHDR) {
appendchain = m_copypacket(clonechain, M_DONTWAIT);
} else {
appendchain = m_copy(clonechain, 0, M_COPYALL);
}
}
}
if (appendchain == NULL) {
/* error */
if (outchain)
sctp_m_freem(outchain);
return (NULL);
}
/* if outchain is null, check our special reservation flag */
if (outchain == NULL) {
/*
* need a lead mbuf in this one if we don't have space for:
* - E-net header (12+2+2) - IP header (20/40) - SCTP Common
* Header (12)
*/
if (M_LEADINGSPACE(appendchain) < (SCTP_FIRST_MBUF_RESV)) {
outchain = sctp_get_mbuf_for_msg(8, 1, M_DONTWAIT, 1, MT_HEADER);
if (outchain) {
/*
* if we don't hit here we have a problem
* anyway :o We reserve all the mbuf for
* prepends.
*/
outchain->m_pkthdr.len = 0;
outchain->m_len = 0;
outchain->m_next = NULL;
MH_ALIGN(outchain, 4);
*endofchain = outchain;
}
}
}
if (outchain) {
/* tack on to the end */
if (*endofchain != NULL) {
(*endofchain)->m_next = appendchain;
} else {
m = outchain;
while (m) {
if (m->m_next == NULL) {
m->m_next = appendchain;
break;
}
m = m->m_next;
}
}
if (outchain->m_flags & M_PKTHDR) {
int append_tot;
m = appendchain;
append_tot = 0;
while (m) {
append_tot += m->m_len;
if (m->m_next == NULL) {
*endofchain = m;
}
m = m->m_next;
}
outchain->m_pkthdr.len += append_tot;
} else {
/*
* save off the end and update the end-chain postion
*/
m = appendchain;
while (m) {
if (m->m_next == NULL) {
*endofchain = m;
break;
}
m = m->m_next;
}
}
return (outchain);
} else {
/* save off the end and update the end-chain postion */
m = appendchain;
while (m) {
if (m->m_next == NULL) {
*endofchain = m;
break;
}
m = m->m_next;
}
return (appendchain);
}
}
int
sctp_med_chunk_output(struct sctp_inpcb *inp,
struct sctp_tcb *stcb,
struct sctp_association *asoc,
int *num_out,
int *reason_code,
int control_only, int *cwnd_full, int from_where,
struct timeval *now, int *now_filled, int frag_point);
static void
sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
uint32_t val)
{
struct sctp_copy_all *ca;
struct mbuf *m;
int ret = 0;
int added_control = 0;
int un_sent, do_chunk_output = 1;
struct sctp_association *asoc;
ca = (struct sctp_copy_all *)ptr;
if (ca->m == NULL) {
return;
}
if (ca->inp != inp) {
/* TSNH */
return;
}
if ((ca->m) && (ca->m->m_pkthdr.len)) {
m = m_copym(ca->m, 0, M_COPYALL, M_DONTWAIT);
if (m == NULL) {
/* can't copy so we are done */
ca->cnt_failed++;
return;
}
} else {
m = NULL;
}
SCTP_TCB_LOCK_ASSERT(stcb);
if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
/* Abort this assoc with m as the user defined reason */
if (m) {
struct sctp_paramhdr *ph;
M_PREPEND(m, sizeof(struct sctp_paramhdr), M_DONTWAIT);
if (m) {
ph = mtod(m, struct sctp_paramhdr *);
ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
ph->param_length = htons(m->m_pkthdr.len);
}
/*
* We add one here to keep the assoc from
* dis-appearing on us.
*/
atomic_add_int(&stcb->asoc.refcnt, 1);
sctp_abort_an_association(inp, stcb,
SCTP_RESPONSE_TO_USER_REQ,
m);
/*
* sctp_abort_an_association calls sctp_free_asoc()
* free association will NOT free it since we
* incremented the refcnt .. we do this to prevent
* it being freed and things getting tricky since we
* could end up (from free_asoc) calling inpcb_free
* which would get a recursive lock call to the
* iterator lock.. But as a consequence of that the
* stcb will return to us un-locked.. since
* free_asoc returns with either no TCB or the TCB
* unlocked, we must relock.. to unlock in the
* iterator timer :-0
*/
SCTP_TCB_LOCK(stcb);
atomic_add_int(&stcb->asoc.refcnt, -1);
goto no_chunk_output;
}
} else {
if (m) {
ret = sctp_msg_append(stcb, stcb->asoc.primary_destination, m,
&ca->sndrcv, 1);
}
asoc = &stcb->asoc;
if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
/* shutdown this assoc */
if (TAILQ_EMPTY(&asoc->send_queue) &&
TAILQ_EMPTY(&asoc->sent_queue) &&
(asoc->stream_queue_cnt == 0)) {
if (asoc->locked_on_sending) {
goto abort_anyway;
}
/*
* there is nothing queued to send, so I'm
* done...
*/
if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
(SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
(SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
/*
* only send SHUTDOWN the first time
* through
*/
sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
asoc->state = SCTP_STATE_SHUTDOWN_SENT;
SCTP_STAT_DECR_GAUGE32(sctps_currestab);
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
asoc->primary_destination);
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
asoc->primary_destination);
added_control = 1;
do_chunk_output = 0;
}
} else {
/*
* we still got (or just got) data to send,
* so set SHUTDOWN_PENDING
*/
/*
* XXX sockets draft says that SCTP_EOF
* should be sent with no data. currently,
* we will allow user data to be sent first
* and move to SHUTDOWN-PENDING
*/
if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
(SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
(SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
if (asoc->locked_on_sending) {
/*
* Locked to send out the
* data
*/
struct sctp_stream_queue_pending *sp;
sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
if (sp) {
if ((sp->length == 0) && (sp->msg_is_complete == 0))
asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
}
}
asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
if (TAILQ_EMPTY(&asoc->send_queue) &&
TAILQ_EMPTY(&asoc->sent_queue) &&
(asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
abort_anyway:
atomic_add_int(&stcb->asoc.refcnt, 1);
sctp_abort_an_association(stcb->sctp_ep, stcb,
SCTP_RESPONSE_TO_USER_REQ,
NULL);
atomic_add_int(&stcb->asoc.refcnt, -1);
goto no_chunk_output;
}
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
asoc->primary_destination);
}
}
}
}
un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count) * sizeof(struct sctp_data_chunk)));
if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
(stcb->asoc.total_flight > 0) &&
(un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
) {
do_chunk_output = 0;
}
if (do_chunk_output)
sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND);
else if (added_control) {
int num_out = 0, reason = 0, cwnd_full = 0, now_filled = 0;
struct timeval now;
int frag_point;
frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
&reason, 1, &cwnd_full, 1, &now, &now_filled, frag_point);
}
no_chunk_output:
if (ret) {
ca->cnt_failed++;
} else {
ca->cnt_sent++;
}
}
static void
sctp_sendall_completes(void *ptr, uint32_t val)
{
struct sctp_copy_all *ca;
ca = (struct sctp_copy_all *)ptr;
/*
* Do a notify here? Kacheong suggests that the notify be done at
* the send time.. so you would push up a notification if any send
* failed. Don't know if this is feasable since the only failures we
* have is "memory" related and if you cannot get an mbuf to send
* the data you surely can't get an mbuf to send up to notify the
* user you can't send the data :->
*/
/* now free everything */
sctp_m_freem(ca->m);
SCTP_FREE(ca);
}
#define MC_ALIGN(m, len) do { \
(m)->m_data += (MCLBYTES - (len)) & ~(sizeof(long) - 1); \
} while (0)
static struct mbuf *
sctp_copy_out_all(struct uio *uio, int len)
{
struct mbuf *ret, *at;
int left, willcpy, cancpy, error;
ret = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_WAIT, 1, MT_DATA);
if (ret == NULL) {
/* TSNH */
return (NULL);
}
left = len;
ret->m_len = 0;
ret->m_pkthdr.len = len;
/* save space for the data chunk header */
cancpy = M_TRAILINGSPACE(ret);
willcpy = min(cancpy, left);
at = ret;
while (left > 0) {
/* Align data to the end */
error = uiomove(mtod(at, caddr_t), willcpy, uio);
if (error) {
err_out_now:
sctp_m_freem(at);
return (NULL);
}
at->m_len = willcpy;
at->m_nextpkt = at->m_next = 0;
left -= willcpy;
if (left > 0) {
at->m_next = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
if (at->m_next == NULL) {
goto err_out_now;
}
at = at->m_next;
at->m_len = 0;
cancpy = M_TRAILINGSPACE(at);
willcpy = min(cancpy, left);
}
}
return (ret);
}
static int
sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
struct sctp_sndrcvinfo *srcv)
{
int ret;
struct sctp_copy_all *ca;
SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
"CopyAll");
if (ca == NULL) {
sctp_m_freem(m);
return (ENOMEM);
}
memset(ca, 0, sizeof(struct sctp_copy_all));
ca->inp = inp;
ca->sndrcv = *srcv;
/*
* take off the sendall flag, it would be bad if we failed to do
* this :-0
*/
ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
/* get length and mbuf chain */
if (uio) {
ca->sndlen = uio->uio_resid;
ca->m = sctp_copy_out_all(uio, ca->sndlen);
if (ca->m == NULL) {
out_no_mem:
SCTP_FREE(ca);
return (ENOMEM);
}
} else {
if ((m->m_flags & M_PKTHDR) == 0) {
struct mbuf *mat;
mat = m;
ca->sndlen = 0;
while (m) {
ca->sndlen += m->m_len;
m = m->m_next;
}
mat = sctp_get_mbuf_for_msg(1, 1, M_WAIT, 1, MT_DATA);
if (mat) {
sctp_m_freem(m);
goto out_no_mem;
}
/* We MUST have a header on the front */
mat->m_next = m;
mat->m_len = 0;
mat->m_pkthdr.len = ca->sndlen;
ca->m = mat;
} else {
ca->sndlen = m->m_pkthdr.len;
}
ca->m = m;
}
ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator,
SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES, SCTP_ASOC_ANY_STATE,
(void *)ca, 0,
sctp_sendall_completes, inp, 1);
if (ret) {
#ifdef SCTP_DEBUG
printf("Failed to initiate iterator for sendall\n");
#endif
SCTP_FREE(ca);
return (EFAULT);
}
return (0);
}
void
sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
{
struct sctp_tmit_chunk *chk, *nchk;
chk = TAILQ_FIRST(&asoc->control_send_queue);
while (chk) {
nchk = TAILQ_NEXT(chk, sctp_next);
if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
if (chk->data) {
sctp_m_freem(chk->data);
chk->data = NULL;
}
asoc->ctrl_queue_cnt--;
if (chk->whoTo)
sctp_free_remote_addr(chk->whoTo);
sctp_free_a_chunk(stcb, chk);
}
chk = nchk;
}
}
void
sctp_toss_old_asconf(struct sctp_tcb *stcb)
{
struct sctp_association *asoc;
struct sctp_tmit_chunk *chk, *chk_tmp;
asoc = &stcb->asoc;
for (chk = TAILQ_FIRST(&asoc->control_send_queue); chk != NULL;
chk = chk_tmp) {
/* get next chk */
chk_tmp = TAILQ_NEXT(chk, sctp_next);
/* find SCTP_ASCONF chunk in queue (only one ever in queue) */
if (chk->rec.chunk_id.id == SCTP_ASCONF) {
TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
if (chk->data) {
sctp_m_freem(chk->data);
chk->data = NULL;
}
asoc->ctrl_queue_cnt--;
if (chk->whoTo)
sctp_free_remote_addr(chk->whoTo);
sctp_free_a_chunk(stcb, chk);
}
}
}
static __inline void
sctp_clean_up_datalist(struct sctp_tcb *stcb,
struct sctp_association *asoc,
struct sctp_tmit_chunk **data_list,
int bundle_at,
struct sctp_nets *net)
{
int i;
struct sctp_tmit_chunk *tp1;
for (i = 0; i < bundle_at; i++) {
/* off of the send queue */
if (i) {
/*
* Any chunk NOT 0 you zap the time chunk 0 gets
* zapped or set based on if a RTO measurment is
* needed.
*/
data_list[i]->do_rtt = 0;
}
/* record time */
data_list[i]->sent_rcv_time = net->last_sent_time;
data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
TAILQ_REMOVE(&asoc->send_queue,
data_list[i],
sctp_next);
/* on to the sent queue */
tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
if ((tp1) && (compare_with_wrap(tp1->rec.data.TSN_seq,
data_list[i]->rec.data.TSN_seq, MAX_TSN))) {
struct sctp_tmit_chunk *tpp;
/* need to move back */
back_up_more:
tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
if (tpp == NULL) {
TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
goto all_done;
}
tp1 = tpp;
if (compare_with_wrap(tp1->rec.data.TSN_seq,
data_list[i]->rec.data.TSN_seq, MAX_TSN)) {
goto back_up_more;
}
TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
} else {
TAILQ_INSERT_TAIL(&asoc->sent_queue,
data_list[i],
sctp_next);
}
all_done:
/* This does not lower until the cum-ack passes it */
asoc->sent_queue_cnt++;
asoc->send_queue_cnt--;
if ((asoc->peers_rwnd <= 0) &&
(asoc->total_flight == 0) &&
(bundle_at == 1)) {
/* Mark the chunk as being a window probe */
SCTP_STAT_INCR(sctps_windowprobed);
data_list[i]->rec.data.state_flags |= SCTP_WINDOW_PROBE;
} else {
data_list[i]->rec.data.state_flags &= ~SCTP_WINDOW_PROBE;
}
#ifdef SCTP_AUDITING_ENABLED
sctp_audit_log(0xC2, 3);
#endif
data_list[i]->sent = SCTP_DATAGRAM_SENT;
data_list[i]->snd_count = 1;
data_list[i]->rec.data.chunk_was_revoked = 0;
#ifdef SCTP_FLIGHT_LOGGING
sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
data_list[i]->whoTo->flight_size,
data_list[i]->book_size,
(uintptr_t) stcb,
data_list[i]->rec.data.TSN_seq);
#endif
net->flight_size += data_list[i]->book_size;
asoc->total_flight += data_list[i]->book_size;
asoc->total_flight_count++;
#ifdef SCTP_LOG_RWND
sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
asoc->peers_rwnd, data_list[i]->send_size, sctp_peer_chunk_oh);
#endif
asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
(uint32_t) (data_list[i]->send_size + sctp_peer_chunk_oh));
if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
/* SWS sender side engages */
asoc->peers_rwnd = 0;
}
}
}
static __inline void
sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc)
{
struct sctp_tmit_chunk *chk, *nchk;
for (chk = TAILQ_FIRST(&asoc->control_send_queue);
chk; chk = nchk) {
nchk = TAILQ_NEXT(chk, sctp_next);
if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
(chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
(chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
(chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
(chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
(chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
(chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
(chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
(chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
(chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
/* Stray chunks must be cleaned up */
clean_up_anyway:
TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
if (chk->data) {
sctp_m_freem(chk->data);
chk->data = NULL;
}
asoc->ctrl_queue_cnt--;
sctp_free_remote_addr(chk->whoTo);
sctp_free_a_chunk(stcb, chk);
} else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
/* special handling, we must look into the param */
if (chk != asoc->str_reset) {
goto clean_up_anyway;
}
}
}
}
extern int sctp_min_split_point;
static __inline int
sctp_can_we_split_this(struct sctp_tcb *stcb,
struct sctp_stream_queue_pending *sp,
int goal_mtu, int frag_point, int eeor_on)
{
/*
* Make a decision on if I should split a msg into multiple parts.
*/
if (goal_mtu < sctp_min_split_point) {
/* you don't want enough */
return (0);
}
if (sp->msg_is_complete == 0) {
if (eeor_on) {
/*
* If we are doing EEOR we need to always send it if
* its the entire thing.
*/
if (goal_mtu >= sp->length)
return (sp->length);
} else {
if (goal_mtu >= sp->length) {
/*
* If we cannot fill the amount needed there
* is no sense of splitting the chunk.
*/
return (0);
}
}
/*
* If we reach here sp->length is larger than the goal_mtu.
* Do we wish to split it for the sake of packet putting
* together?
*/
if (goal_mtu >= min(sctp_min_split_point, stcb->asoc.smallest_mtu)) {
/* Its ok to split it */
return (min(goal_mtu, frag_point));
}
} else {
/* We can always split a complete message to make it fit */
if (goal_mtu >= sp->length)
/* Take it all */
return (sp->length);
return (min(goal_mtu, frag_point));
}
/* Nope, can't split */
return (0);
}
static int
sctp_move_to_outqueue(struct sctp_tcb *stcb, struct sctp_nets *net,
struct sctp_stream_out *strq,
int goal_mtu,
int frag_point,
int *locked,
int *giveup,
int eeor_mode)
{
/* Move from the stream to the send_queue keeping track of the total */
struct sctp_association *asoc;
struct sctp_stream_queue_pending *sp;
struct sctp_tmit_chunk *chk;
struct sctp_data_chunk *dchkh;
int to_move;
uint8_t rcv_flags = 0;
uint8_t some_taken;
uint8_t took_all = 0;
SCTP_TCB_LOCK_ASSERT(stcb);
asoc = &stcb->asoc;
sp = TAILQ_FIRST(&strq->outqueue);
if (sp == NULL) {
*locked = 0;
SCTP_TCB_SEND_LOCK(stcb);
if (strq->last_msg_incomplete) {
printf("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
strq->stream_no, strq->last_msg_incomplete);
strq->last_msg_incomplete = 0;
}
SCTP_TCB_SEND_UNLOCK(stcb);
return (0);
}
SCTP_TCB_SEND_LOCK(stcb);
if ((sp->length == 0) && (sp->msg_is_complete == 0)) {
/* Must wait for more data, must be last msg */
*locked = 1;
*giveup = 1;
SCTP_TCB_SEND_UNLOCK(stcb);
return (0);
} else if (sp->length == 0) {
/* This should not happen */
panic("sp length is 0?");
}
some_taken = sp->some_taken;
if ((goal_mtu >= sp->length) && (sp->msg_is_complete)) {
/* It all fits and its a complete msg, no brainer */
to_move = min(sp->length, frag_point);
if (to_move == sp->length) {
/* Getting it all */
if (sp->some_taken) {
rcv_flags |= SCTP_DATA_LAST_FRAG;
} else {
rcv_flags |= SCTP_DATA_NOT_FRAG;
}
} else {
/* Not getting it all, frag point overrides */
if (sp->some_taken == 0) {
rcv_flags |= SCTP_DATA_FIRST_FRAG;
}
sp->some_taken = 1;
}
} else {
to_move = sctp_can_we_split_this(stcb, sp, goal_mtu,
frag_point, eeor_mode);
if (to_move) {
if (to_move >= sp->length) {
to_move = sp->length;
}
if (sp->some_taken == 0) {
rcv_flags |= SCTP_DATA_FIRST_FRAG;
}
sp->some_taken = 1;
} else {
if (sp->some_taken) {
*locked = 1;
}
*giveup = 1;
SCTP_TCB_SEND_UNLOCK(stcb);
return (0);
}
}
SCTP_TCB_SEND_UNLOCK(stcb);
/* If we reach here, we can copy out a chunk */
sctp_alloc_a_chunk(stcb, chk);
if (chk == NULL) {
/* No chunk memory */
out_gu:
*giveup = 1;
return (0);
}
/*
* Setup for unordered if needed by looking at the user sent info
* flags.
*/
if (sp->sinfo_flags & SCTP_UNORDERED) {
rcv_flags |= SCTP_DATA_UNORDERED;
}
/* clear out the chunk before setting up */
memset(chk, sizeof(*chk), 0);
chk->rec.data.rcv_flags = rcv_flags;
SCTP_TCB_SEND_LOCK(stcb);
if (sp->data->m_flags & M_EXT) {
chk->copy_by_ref = 1;
} else {
chk->copy_by_ref = 0;
}
if (to_move >= sp->length) {
/* we can steal the whole thing */
chk->data = sp->data;
chk->last_mbuf = sp->tail_mbuf;
/* register the stealing */
sp->data = sp->tail_mbuf = NULL;
took_all = 1;
} else {
struct mbuf *m;
chk->data = m_copym(sp->data, 0, to_move, M_DONTWAIT);
chk->last_mbuf = NULL;
if (chk->data == NULL) {
sp->some_taken = some_taken;
sctp_free_a_chunk(stcb, chk);
SCTP_TCB_SEND_UNLOCK(stcb);
goto out_gu;
}
/* Pull off the data */
m_adj(sp->data, to_move);
/* Now lets work our way down and compact it */
m = sp->data;
while (m && (m->m_len == 0)) {
sp->data = m->m_next;
m->m_next = NULL;
if (sp->tail_mbuf == m) {
/* freeing tail */
sp->tail_mbuf = sp->data;
}
sctp_m_free(m);
m = sp->data;
}
}
if (to_move > sp->length) {
panic("Huh, how can to_move be larger?");
} else {
sp->length -= to_move;
}
/* Update the new length in */
if (sp->data && (sp->data->m_flags & M_PKTHDR)) {
/* update length */
sp->data->m_pkthdr.len = sp->length;
}
if (M_LEADINGSPACE(chk->data) < sizeof(struct sctp_data_chunk)) {
/* Not enough room for a chunk header, get some */
struct mbuf *m;
m = sctp_get_mbuf_for_msg(1, 1, M_DONTWAIT, 0, MT_DATA);
if (m == NULL) {
/*
* we're in trouble here. M_PREPEND below will free
* all the data if there is no leading space, so we
* must put the data back and restore.
*/
if (took_all) {
/* unsteal the data */
sp->data = chk->data;
sp->tail_mbuf = chk->last_mbuf;
} else {
struct mbuf *m;
/* reassemble the data */
m = sp->data;
sp->data = chk->data;
sp->data->m_next = m;
}
sp->some_taken = some_taken;
sp->length += to_move;
if (sp->data && (sp->data->m_flags & M_PKTHDR)) {
sp->data->m_pkthdr.len = sp->length;
}
sctp_free_a_chunk(stcb, chk);
SCTP_TCB_SEND_UNLOCK(stcb);
goto out_gu;
} else {
m->m_len = 0;
m->m_next = chk->data;
chk->data = m;
chk->data->m_pkthdr.len = to_move;
MH_ALIGN(chk->data, 4);
}
}
M_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
if (chk->data == NULL) {
/* HELP */
sctp_free_a_chunk(stcb, chk);
SCTP_TCB_SEND_UNLOCK(stcb);
goto out_gu;
}
sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
chk->book_size = chk->send_size = (to_move +
sizeof(struct sctp_data_chunk));
chk->sent = SCTP_DATAGRAM_UNSENT;
/*
* get last_mbuf and counts of mb useage This is ugly but hopefully
* its only one mbuf.
*/
if (chk->last_mbuf == NULL) {
chk->last_mbuf = chk->data;
while (chk->last_mbuf->m_next != NULL) {
chk->last_mbuf = chk->last_mbuf->m_next;
}
}
chk->flags = 0;
chk->asoc = &stcb->asoc;
chk->pad_inplace = 0;
chk->no_fr_allowed = 0;
chk->rec.data.stream_seq = sp->strseq;
chk->rec.data.stream_number = sp->stream;
chk->rec.data.payloadtype = sp->ppid;
chk->rec.data.context = sp->context;
chk->rec.data.doing_fast_retransmit = 0;
chk->rec.data.ect_nonce = 0; /* ECN Nonce */
chk->rec.data.timetodrop = sp->ts;
chk->flags = sp->act_flags;
chk->addr_over = sp->addr_over;
chk->whoTo = net;
atomic_add_int(&chk->whoTo->ref_count, 1);
chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
#ifdef SCTP_LOG_SENDING_STR
sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
(uintptr_t) stcb, (uintptr_t) sp,
(uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
chk->rec.data.TSN_seq);
#endif
dchkh = mtod(chk->data, struct sctp_data_chunk *);
/*
* Put the rest of the things in place now. Size was done earlier in
* previous loop prior to padding.
*/
dchkh->ch.chunk_type = SCTP_DATA;
dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
dchkh->dp.stream_id = htons(strq->stream_no);
dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
dchkh->dp.protocol_id = chk->rec.data.payloadtype;
dchkh->ch.chunk_length = htons(chk->send_size);
/* Now advance the chk->send_size by the actual pad needed. */
if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
/* need a pad */
struct mbuf *lm;
int pads;
pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
chk->pad_inplace = 1;
}
if ((lm = chk->last_mbuf->m_next) != NULL) {
/* pad added an mbuf */
chk->last_mbuf = lm;
}
if (chk->data->m_flags & M_PKTHDR) {
chk->data->m_pkthdr.len += pads;
}
chk->send_size += pads;
}
/* We only re-set the policy if it is on */
if (sp->pr_sctp_on) {
sctp_set_prsctp_policy(stcb, sp);
}
if (sp->msg_is_complete && (sp->length == 0)) {
/* All done pull and kill the message */
asoc->stream_queue_cnt--;
TAILQ_REMOVE(&strq->outqueue, sp, next);
sctp_free_remote_addr(sp->net);
if (sp->data) {
sctp_m_freem(sp->data);
sp->data = NULL;
}
sctp_free_a_strmoq(stcb, sp);
/* we can't be locked to it */
*locked = 0;
stcb->asoc.locked_on_sending = NULL;
} else {
/* more to go, we are locked */
*locked = 1;
}
asoc->chunks_on_out_queue++;
if (sp->pr_sctp_on) {
asoc->pr_sctp_cnt++;
chk->pr_sctp_on = 1;
} else {
chk->pr_sctp_on = 0;
}
TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
asoc->send_queue_cnt++;
SCTP_TCB_SEND_UNLOCK(stcb);
return (to_move);
}
static struct sctp_stream_out *
sctp_select_a_stream(struct sctp_tcb *stcb, struct sctp_association *asoc)
{
struct sctp_stream_out *strq;
/* Find the next stream to use */
if (asoc->last_out_stream == NULL) {
strq = asoc->last_out_stream = TAILQ_FIRST(&asoc->out_wheel);
if (asoc->last_out_stream == NULL) {
/* huh nothing on the wheel, TSNH */
return (NULL);
}
goto done_it;
}
strq = TAILQ_NEXT(asoc->last_out_stream, next_spoke);
done_it:
if (strq == NULL) {
strq = asoc->last_out_stream = TAILQ_FIRST(&asoc->out_wheel);
}
return (strq);
}
static void
sctp_fill_outqueue(struct sctp_tcb *stcb,
struct sctp_nets *net, int frag_point, int eeor_mode)
{
struct sctp_association *asoc;
struct sctp_stream_out *strq, *strqn;
int goal_mtu, moved_how_much, total_moved = 0;
int locked, giveup;
struct sctp_stream_queue_pending *sp;
SCTP_TCB_LOCK_ASSERT(stcb);
asoc = &stcb->asoc;
#ifdef AF_INET6
if (net->ro._l_addr.sin6.sin6_family == AF_INET6) {
goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
} else {
/* ?? not sure what else to do */
goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
}
#else
goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
mtu_fromwheel = 0;
#endif
/* Need an allowance for the data chunk header too */
goal_mtu -= sizeof(struct sctp_data_chunk);
/* must make even word boundary */
goal_mtu &= 0xfffffffc;
if (asoc->locked_on_sending) {
/* We are stuck on one stream until the message completes. */
strqn = strq = asoc->locked_on_sending;
locked = 1;
} else {
strqn = strq = sctp_select_a_stream(stcb, asoc);
locked = 0;
}
while ((goal_mtu > 0) && strq) {
sp = TAILQ_FIRST(&strq->outqueue);
/*
* If CMT is off, we must validate that the stream in
* question has the first item pointed towards are network
* destionation requested by the caller. Note that if we
* turn out to be locked to a stream (assigning TSN's then
* we must stop, since we cannot look for another stream
* with data to send to that destination). In CMT's case, by
* skipping this check, we will send one data packet towards
* the requested net.
*/
if (sp == NULL) {
break;
}
if ((sp->net != net) && (sctp_cmt_on_off == 0)) {
/* none for this network */
if (locked) {
break;
} else {
strq = sctp_select_a_stream(stcb, asoc);
if (strq == NULL)
/* none left */
break;
if (strqn == strq) {
/* I have circled */
break;
}
continue;
}
}
giveup = 0;
moved_how_much = sctp_move_to_outqueue(stcb, net, strq, goal_mtu, frag_point, &locked,
&giveup, eeor_mode);
asoc->last_out_stream = strq;
if (locked) {
asoc->locked_on_sending = strq;
if ((moved_how_much == 0) || (giveup))
/* no more to move for now */
break;
} else {
asoc->locked_on_sending = NULL;
if (TAILQ_FIRST(&strq->outqueue) == NULL) {
sctp_remove_from_wheel(stcb, asoc, strq);
}
if (giveup) {
break;
}
strq = sctp_select_a_stream(stcb, asoc);
if (strq == NULL) {
break;
}
}
total_moved += moved_how_much;
goal_mtu -= moved_how_much;
goal_mtu &= 0xfffffffc;
}
if (total_moved == 0) {
if ((sctp_cmt_on_off == 0) &&
(net == stcb->asoc.primary_destination)) {
/* ran dry for primary network net */
SCTP_STAT_INCR(sctps_primary_randry);
} else if (sctp_cmt_on_off) {
/* ran dry with CMT on */
SCTP_STAT_INCR(sctps_cmt_randry);
}
}
}
__inline void
sctp_fix_ecn_echo(struct sctp_association *asoc)
{
struct sctp_tmit_chunk *chk;
TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
chk->sent = SCTP_DATAGRAM_UNSENT;
}
}
}
static void
sctp_move_to_an_alt(struct sctp_tcb *stcb,
struct sctp_association *asoc,
struct sctp_nets *net)
{
struct sctp_tmit_chunk *chk;
struct sctp_nets *a_net;
SCTP_TCB_LOCK_ASSERT(stcb);
a_net = sctp_find_alternate_net(stcb, net, 0);
if ((a_net != net) &&
((a_net->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE)) {
/*
* We only proceed if a valid alternate is found that is not
* this one and is reachable. Here we must move all chunks
* queued in the send queue off of the destination address
* to our alternate.
*/
TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
if (chk->whoTo == net) {
/* Move the chunk to our alternate */
sctp_free_remote_addr(chk->whoTo);
chk->whoTo = a_net;
atomic_add_int(&a_net->ref_count, 1);
}
}
}
}
extern int sctp_early_fr;
int
sctp_med_chunk_output(struct sctp_inpcb *inp,
struct sctp_tcb *stcb,
struct sctp_association *asoc,
int *num_out,
int *reason_code,
int control_only, int *cwnd_full, int from_where,
struct timeval *now, int *now_filled, int frag_point)
{
/*
* Ok this is the generic chunk service queue. we must do the
* following: - Service the stream queue that is next, moving any
* message (note I must get a complete message i.e. FIRST/MIDDLE and
* LAST to the out queue in one pass) and assigning TSN's - Check to
* see if the cwnd/rwnd allows any output, if so we go ahead and
* fomulate and send the low level chunks. Making sure to combine
* any control in the control chunk queue also.
*/
struct sctp_nets *net;
struct mbuf *outchain, *endoutchain;
struct sctp_tmit_chunk *chk, *nchk;
struct sctphdr *shdr;
/* temp arrays for unlinking */
struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
int no_fragmentflg, error;
int one_chunk, hbflag;
int asconf, cookie, no_out_cnt;
int bundle_at, ctl_cnt, no_data_chunks, cwnd_full_ind, eeor_mode;
unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
*num_out = 0;
struct sctp_nets *start_at, *old_startat = NULL, *send_start_at;
cwnd_full_ind = 0;
int tsns_sent = 0;
uint32_t auth_offset = 0;
struct sctp_auth_chunk *auth = NULL;
if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
(asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
(sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
eeor_mode = 1;
} else {
eeor_mode = 0;
}
ctl_cnt = no_out_cnt = asconf = cookie = 0;
/*
* First lets prime the pump. For each destination, if there is room
* in the flight size, attempt to pull an MTU's worth out of the
* stream queues into the general send_queue
*/
#ifdef SCTP_AUDITING_ENABLED
sctp_audit_log(0xC2, 2);
#endif
SCTP_TCB_LOCK_ASSERT(stcb);
hbflag = 0;
if ((control_only) || (asoc->stream_reset_outstanding))
no_data_chunks = 1;
else
no_data_chunks = 0;
/* Nothing to possible to send? */
if (TAILQ_EMPTY(&asoc->control_send_queue) &&
TAILQ_EMPTY(&asoc->send_queue) &&
TAILQ_EMPTY(&asoc->out_wheel)) {
*reason_code = 9;
return (0);
}
if (asoc->peers_rwnd == 0) {
/* No room in peers rwnd */
*cwnd_full = 1;
*reason_code = 1;
if (asoc->total_flight > 0) {
/* we are allowed one chunk in flight */
no_data_chunks = 1;
}
}
if ((no_data_chunks == 0) && (!TAILQ_EMPTY(&asoc->out_wheel))) {
if (sctp_cmt_on_off) {
/*
* for CMT we start at the next one past the one we
* last added data to.
*/
if (TAILQ_FIRST(&asoc->send_queue) != NULL) {
goto skip_the_fill_from_streams;
}
if (asoc->last_net_data_came_from) {
net = TAILQ_NEXT(asoc->last_net_data_came_from, sctp_next);
if (net == NULL) {
net = TAILQ_FIRST(&asoc->nets);
}
} else {
/* back to start */
net = TAILQ_FIRST(&asoc->nets);
}
} else {
net = asoc->primary_destination;
if (net == NULL) {
/* TSNH */
net = TAILQ_FIRST(&asoc->nets);
}
}
start_at = net;
one_more_time:
for (; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
if (old_startat && (old_startat == net)) {
break;
}
if ((sctp_cmt_on_off == 0) && (net->ref_count < 2)) {
/* nothing can be in queue for this guy */
continue;
}
if (net->flight_size >= net->cwnd) {
/* skip this network, no room */
cwnd_full_ind++;
continue;
}
/*
* @@@ JRI : this for loop we are in takes in each
* net, if its's got space in cwnd and has data sent
* to it (when CMT is off) then it calls
* sctp_fill_outqueue for the net. This gets data on
* the send queue for that network.
*
* In sctp_fill_outqueue TSN's are assigned and data is
* copied out of the stream buffers. Note mostly
* copy by reference (we hope).
*/
#ifdef SCTP_CWND_LOGGING
sctp_log_cwnd(stcb, net, 0, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
#endif
sctp_fill_outqueue(stcb, net, frag_point, eeor_mode);
}
if (start_at != TAILQ_FIRST(&asoc->nets)) {
/* got to pick up the beginning stuff. */
old_startat = start_at;
start_at = net = TAILQ_FIRST(&asoc->nets);
goto one_more_time;
}
}
skip_the_fill_from_streams:
*cwnd_full = cwnd_full_ind;
/* now service each destination and send out what we can for it */
/* Nothing to send? */
if ((TAILQ_FIRST(&asoc->control_send_queue) == NULL) &&
(TAILQ_FIRST(&asoc->send_queue) == NULL)) {
*reason_code = 8;
return (0);
}
chk = TAILQ_FIRST(&asoc->send_queue);
if (chk) {
send_start_at = chk->whoTo;
} else {
send_start_at = TAILQ_FIRST(&asoc->nets);
}
old_startat = NULL;
again_one_more_time:
for (net = send_start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
/* how much can we send? */
/* printf("Examine for sending net:%x\n", (uint32_t)net); */
if (old_startat && (old_startat == net)) {
/* through list ocmpletely. */
break;
}
tsns_sent = 0;
if (net->ref_count < 2) {
/*
* Ref-count of 1 so we cannot have data or control
* queued to this address. Skip it.
*/
continue;
}
ctl_cnt = bundle_at = 0;
endoutchain = outchain = NULL;
no_fragmentflg = 1;
one_chunk = 0;
if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
/*
* if we have a route and an ifp check to see if we
* have room to send to this guy
*/
struct ifnet *ifp;
ifp = net->ro.ro_rt->rt_ifp;
if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
SCTP_STAT_INCR(sctps_ifnomemqueued);
#ifdef SCTP_LOG_MAXBURST
sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
#endif
continue;
}
}
if (((struct sockaddr *)&net->ro._l_addr)->sa_family == AF_INET) {
mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
} else {
mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
}
mx_mtu = mtu;
to_out = 0;
if (mtu > asoc->peers_rwnd) {
if (asoc->total_flight > 0) {
/* We have a packet in flight somewhere */
r_mtu = asoc->peers_rwnd;
} else {
/* We are always allowed to send one MTU out */
one_chunk = 1;
r_mtu = mtu;
}
} else {
r_mtu = mtu;
}
/************************/
/* Control transmission */
/************************/
/* Now first lets go through the control queue */
for (chk = TAILQ_FIRST(&asoc->control_send_queue);
chk; chk = nchk) {
nchk = TAILQ_NEXT(chk, sctp_next);
if (chk->whoTo != net) {
/*
* No, not sent to the network we are
* looking at
*/
continue;
}
if (chk->data == NULL) {
continue;
}
if ((chk->data->m_flags & M_PKTHDR) == 0) {
/*
* NOTE: the chk queue MUST have the PKTHDR
* flag set on it with a total in the
* m_pkthdr.len field!! else the chunk will
* ALWAYS be skipped
*/
continue;
}
if (chk->sent != SCTP_DATAGRAM_UNSENT) {
/*
* It must be unsent. Cookies and ASCONF's
* hang around but there timers will force
* when marked for resend.
*/
continue;
}
/*
* if no AUTH is yet included and this chunk
* requires it, make sure to account for it. We
* don't apply the size until the AUTH chunk is
* actually added below in case there is no room for
* this chunk. NOTE: we overload the use of "omtu"
* here
*/
if ((auth == NULL) &&
sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
stcb->asoc.peer_auth_chunks)) {
omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
} else
omtu = 0;
/* Here we do NOT factor the r_mtu */
if ((chk->data->m_pkthdr.len < (int)(mtu - omtu)) ||
(chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
/*
* We probably should glom the mbuf chain
* from the chk->data for control but the
* problem is it becomes yet one more level
* of tracking to do if for some reason
* output fails. Then I have got to
* reconstruct the merged control chain.. el
* yucko.. for now we take the easy way and
* do the copy
*/
/*
* Add an AUTH chunk, if chunk requires it
* save the offset into the chain for AUTH
*/
if ((auth == NULL) &&
(sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
stcb->asoc.peer_auth_chunks))) {
outchain = sctp_add_auth_chunk(outchain,
&endoutchain,
&auth,
&auth_offset,
stcb,
chk->rec.chunk_id.id);
SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
}
outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
(int)chk->rec.chunk_id.can_take_data,
chk->data->m_pkthdr.len, chk->copy_by_ref);
if (outchain == NULL) {
*reason_code = 8;
return (ENOMEM);
}
SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
/* update our MTU size */
if (mtu > (chk->data->m_pkthdr.len + omtu))
mtu -= (chk->data->m_pkthdr.len + omtu);
else
mtu = 0;
to_out += (chk->data->m_pkthdr.len + omtu);
/* Do clear IP_DF ? */
if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
no_fragmentflg = 0;
}
if (chk->rec.chunk_id.can_take_data)
chk->data = NULL;
/* Mark things to be removed, if needed */
if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
(chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
(chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
(chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
(chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
(chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
(chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
(chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
(chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
(chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST)
hbflag = 1;
/* remove these chunks at the end */
if (chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) {
/* turn off the timer */
if (callout_pending(&stcb->asoc.dack_timer.timer)) {
sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
}
}
ctl_cnt++;
} else {
/*
* Other chunks, since they have
* timers running (i.e. COOKIE or
* ASCONF) we just "trust" that it
* gets sent or retransmitted.
*/
ctl_cnt++;
if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
cookie = 1;
no_out_cnt = 1;
} else if (chk->rec.chunk_id.id == SCTP_ASCONF) {
/*
* set hb flag since we can
* use these for RTO
*/
hbflag = 1;
asconf = 1;
}
chk->sent = SCTP_DATAGRAM_SENT;
chk->snd_count++;
}
if (mtu == 0) {
/*
* Ok we are out of room but we can
* output without effecting the
* flight size since this little guy
* is a control only packet.
*/
if (asconf) {
sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
asconf = 0;
}
if (cookie) {
sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
cookie = 0;
}
M_PREPEND(outchain, sizeof(struct sctphdr), M_DONTWAIT);
if (outchain == NULL) {
/* no memory */
error = ENOBUFS;
goto error_out_again;
}
shdr = mtod(outchain, struct sctphdr *);
shdr->src_port = inp->sctp_lport;
shdr->dest_port = stcb->rport;
shdr->v_tag = htonl(stcb->asoc.peer_vtag);
shdr->checksum = 0;
auth_offset += sizeof(struct sctphdr);
if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
(struct sockaddr *)&net->ro._l_addr,
outchain, auth_offset, auth,
no_fragmentflg, 0, NULL, asconf))) {
if (error == ENOBUFS) {
asoc->ifp_had_enobuf = 1;
}
SCTP_STAT_INCR(sctps_lowlevelerr);
if (from_where == 0) {
SCTP_STAT_INCR(sctps_lowlevelerrusr);
}
error_out_again:
/* error, could not output */
if (hbflag) {
if (*now_filled == 0) {
SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
*now_filled = 1;
*now = net->last_sent_time;
} else {
net->last_sent_time = *now;
}
hbflag = 0;
}
if (error == EHOSTUNREACH) {
/*
* Destination went
* unreachable
* during this send
*/
sctp_move_to_an_alt(stcb, asoc, net);
}
sctp_clean_up_ctl(stcb, asoc);
*reason_code = 7;
return (error);
} else
asoc->ifp_had_enobuf = 0;
/* Only HB or ASCONF advances time */
if (hbflag) {
if (*now_filled == 0) {
SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
*now_filled = 1;
*now = net->last_sent_time;
} else {
net->last_sent_time = *now;
}
hbflag = 0;
}
/*
* increase the number we sent, if a
* cookie is sent we don't tell them
* any was sent out.
*/
outchain = endoutchain = NULL;
auth = NULL;
auth_offset = 0;
if (!no_out_cnt)
*num_out += ctl_cnt;
/* recalc a clean slate and setup */
if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
mtu = (net->mtu - SCTP_MIN_OVERHEAD);
} else {
mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
}
to_out = 0;
no_fragmentflg = 1;
}
}
}
/*********************/
/* Data transmission */
/*********************/
/*
* if AUTH for DATA is required and no AUTH has been added
* yet, account for this in the mtu now... if no data can be
* bundled, this adjustment won't matter anyways since the
* packet will be going out...
*/
if ((auth == NULL) &&
sctp_auth_is_required_chunk(SCTP_DATA,
stcb->asoc.peer_auth_chunks)) {
mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
}
/* now lets add any data within the MTU constraints */
if (((struct sockaddr *)&net->ro._l_addr)->sa_family == AF_INET) {
if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
else
omtu = 0;
} else {
if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
else
omtu = 0;
}
if (((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) ||
(cookie)) {
for (chk = TAILQ_FIRST(&asoc->send_queue); chk; chk = nchk) {
if (no_data_chunks) {
/* let only control go out */
*reason_code = 1;
break;
}
if (net->flight_size >= net->cwnd) {
/* skip this net, no room for data */
*reason_code = 2;
break;
}
nchk = TAILQ_NEXT(chk, sctp_next);
if (chk->whoTo != net) {
/* No, not sent to this net */
continue;
}
if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
/*
* strange, we have a chunk that is
* to bit for its destination and
* yet no fragment ok flag.
* Something went wrong when the
* PMTU changed...we did not mark
* this chunk for some reason?? I
* will fix it here by letting IP
* fragment it for now and printing
* a warning. This really should not
* happen ...
*/
#ifdef SCTP_DEBUG
printf("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
chk->send_size, mtu);
#endif
chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
}
if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
/* ok we will add this one */
/*
* Add an AUTH chunk, if chunk
* requires it, save the offset into
* the chain for AUTH
*/
if ((auth == NULL) &&
(sctp_auth_is_required_chunk(SCTP_DATA,
stcb->asoc.peer_auth_chunks))) {
outchain = sctp_add_auth_chunk(outchain,
&endoutchain,
&auth,
&auth_offset,
stcb,
SCTP_DATA);
SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
}
outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
chk->send_size, chk->copy_by_ref);
if (outchain == NULL) {
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_OUTPUT3) {
printf("No memory?\n");
}
#endif
if (!callout_pending(&net->rxt_timer.timer)) {
sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
}
*reason_code = 3;
return (ENOMEM);
}
/* upate our MTU size */
/* Do clear IP_DF ? */
if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
no_fragmentflg = 0;
}
/* unsigned subtraction of mtu */
if (mtu > chk->send_size)
mtu -= chk->send_size;
else
mtu = 0;
/* unsigned subtraction of r_mtu */
if (r_mtu > chk->send_size)
r_mtu -= chk->send_size;
else
r_mtu = 0;
to_out += chk->send_size;
if (to_out > mx_mtu) {
#ifdef INVARIANTS
panic("gag");
#else
printf("Exceeding mtu of %d out size is %d\n",
mx_mtu, to_out);
#endif
}
data_list[bundle_at++] = chk;
if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
mtu = 0;
break;
}
if (chk->sent == SCTP_DATAGRAM_UNSENT) {
if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
} else {
SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
}
if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
}
if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
break;
}
} else {
/*
* Must be sent in order of the
* TSN's (on a network)
*/
break;
}
} /* for () */
} /* if asoc.state OPEN */
/* Is there something to send for this destination? */
if (outchain) {
/* We may need to start a control timer or two */
if (asconf) {
sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
asconf = 0;
}
if (cookie) {
sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
cookie = 0;
}
/* must start a send timer if data is being sent */
if (bundle_at && (!callout_pending(&net->rxt_timer.timer))) {
/*
* no timer running on this destination
* restart it.
*/
sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
}
/* Now send it, if there is anything to send :> */
M_PREPEND(outchain, sizeof(struct sctphdr), M_DONTWAIT);
if (outchain == NULL) {
/* out of mbufs */
error = ENOBUFS;
goto errored_send;
}
shdr = mtod(outchain, struct sctphdr *);
shdr->src_port = inp->sctp_lport;
shdr->dest_port = stcb->rport;
shdr->v_tag = htonl(stcb->asoc.peer_vtag);
shdr->checksum = 0;
auth_offset += sizeof(struct sctphdr);
if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
(struct sockaddr *)&net->ro._l_addr,
outchain,
auth_offset,
auth,
no_fragmentflg,
bundle_at,
data_list[0],
asconf))) {
/* error, we could not output */
if (error == ENOBUFS) {
asoc->ifp_had_enobuf = 1;
}
SCTP_STAT_INCR(sctps_lowlevelerr);
if (from_where == 0) {
SCTP_STAT_INCR(sctps_lowlevelerrusr);
}
errored_send:
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_OUTPUT3) {
printf("Gak send error %d\n", error);
}
#endif
if (hbflag) {
if (*now_filled == 0) {
SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
*now_filled = 1;
*now = net->last_sent_time;
} else {
net->last_sent_time = *now;
}
hbflag = 0;
}
if (error == EHOSTUNREACH) {
/*
* Destination went unreachable
* during this send
*/
sctp_move_to_an_alt(stcb, asoc, net);
}
sctp_clean_up_ctl(stcb, asoc);
*reason_code = 6;
return (error);
} else {
asoc->ifp_had_enobuf = 0;
}
outchain = endoutchain = NULL;
auth = NULL;
auth_offset = 0;
if (bundle_at || hbflag) {
/* For data/asconf and hb set time */
if (*now_filled == 0) {
SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
*now_filled = 1;
*now = net->last_sent_time;
} else {
net->last_sent_time = *now;
}
}
if (!no_out_cnt) {
*num_out += (ctl_cnt + bundle_at);
}
if (bundle_at) {
/* if (!net->rto_pending) { */
/* setup for a RTO measurement */
/* net->rto_pending = 1; */
tsns_sent = data_list[0]->rec.data.TSN_seq;
data_list[0]->do_rtt = 1;
/* } else { */
/* data_list[0]->do_rtt = 0; */
/* } */
SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
if (sctp_early_fr) {
if (net->flight_size < net->cwnd) {
/* start or restart it */
if (callout_pending(&net->fr_timer.timer)) {
sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net,
SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
}
SCTP_STAT_INCR(sctps_earlyfrstrout);
sctp_timer_start(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net);
} else {
/* stop it if its running */
if (callout_pending(&net->fr_timer.timer)) {
SCTP_STAT_INCR(sctps_earlyfrstpout);
sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net,
SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
}
}
}
}
if (one_chunk) {
break;
}
}
#ifdef SCTP_CWND_LOGGING
sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
#endif
}
if (old_startat == NULL) {
old_startat = send_start_at;
send_start_at = TAILQ_FIRST(&asoc->nets);
goto again_one_more_time;
}
/*
* At the end there should be no NON timed chunks hanging on this
* queue.
*/
#ifdef SCTP_CWND_LOGGING
sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
#endif
if ((*num_out == 0) && (*reason_code == 0)) {
*reason_code = 4;
} else {
*reason_code = 5;
}
sctp_clean_up_ctl(stcb, asoc);
return (0);
}
void
sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
{
/*
* Prepend a OPERATIONAL_ERROR chunk header and put on the end of
* the control chunk queue.
*/
struct sctp_chunkhdr *hdr;
struct sctp_tmit_chunk *chk;
struct mbuf *mat;
SCTP_TCB_LOCK_ASSERT(stcb);
sctp_alloc_a_chunk(stcb, chk);
if (chk == NULL) {
/* no memory */
sctp_m_freem(op_err);
return;
}
chk->copy_by_ref = 0;
M_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
if (op_err == NULL) {
sctp_free_a_chunk(stcb, chk);
return;
}
chk->send_size = 0;
mat = op_err;
while (mat != NULL) {
chk->send_size += mat->m_len;
mat = mat->m_next;
}
chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
chk->rec.chunk_id.can_take_data = 1;
chk->sent = SCTP_DATAGRAM_UNSENT;
chk->snd_count = 0;
chk->flags = 0;
chk->asoc = &stcb->asoc;
chk->data = op_err;
chk->whoTo = chk->asoc->primary_destination;
atomic_add_int(&chk->whoTo->ref_count, 1);
hdr = mtod(op_err, struct sctp_chunkhdr *);
hdr->chunk_type = SCTP_OPERATION_ERROR;
hdr->chunk_flags = 0;
hdr->chunk_length = htons(chk->send_size);
TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
chk,
sctp_next);
chk->asoc->ctrl_queue_cnt++;
}
int
sctp_send_cookie_echo(struct mbuf *m,
int offset,
struct sctp_tcb *stcb,
struct sctp_nets *net)
{
/*
* pull out the cookie and put it at the front of the control chunk
* queue.
*/
int at;
struct mbuf *cookie, *mat;
struct sctp_paramhdr parm, *phdr;
struct sctp_chunkhdr *hdr;
struct sctp_tmit_chunk *chk;
uint16_t ptype, plen;
/* First find the cookie in the param area */
cookie = NULL;
at = offset + sizeof(struct sctp_init_chunk);
SCTP_TCB_LOCK_ASSERT(stcb);
do {
phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
if (phdr == NULL) {
return (-3);
}
ptype = ntohs(phdr->param_type);
plen = ntohs(phdr->param_length);
if (ptype == SCTP_STATE_COOKIE) {
int pad;
/* found the cookie */
if ((pad = (plen % 4))) {
plen += 4 - pad;
}
cookie = sctp_m_copym(m, at, plen, M_DONTWAIT);
if (cookie == NULL) {
/* No memory */
return (-2);
}
break;
}
at += SCTP_SIZE32(plen);
} while (phdr);
if (cookie == NULL) {
/* Did not find the cookie */
return (-3);
}
/* ok, we got the cookie lets change it into a cookie echo chunk */
/* first the change from param to cookie */
hdr = mtod(cookie, struct sctp_chunkhdr *);
hdr->chunk_type = SCTP_COOKIE_ECHO;
hdr->chunk_flags = 0;
/* now we MUST have a PKTHDR on it */
if ((cookie->m_flags & M_PKTHDR) != M_PKTHDR) {
/* we hope this happens rarely */
mat = sctp_get_mbuf_for_msg(8, 1, M_DONTWAIT, 1, MT_HEADER);
if (mat == NULL) {
sctp_m_freem(cookie);
return (-4);
}
mat->m_len = 0;
mat->m_pkthdr.rcvif = 0;
mat->m_next = cookie;
cookie = mat;
}
cookie->m_pkthdr.len = plen;
/* get the chunk stuff now and place it in the FRONT of the queue */
sctp_alloc_a_chunk(stcb, chk);
if (chk == NULL) {
/* no memory */
sctp_m_freem(cookie);
return (-5);
}
chk->copy_by_ref = 0;
chk->send_size = cookie->m_pkthdr.len;
chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
chk->rec.chunk_id.can_take_data = 0;
chk->sent = SCTP_DATAGRAM_UNSENT;
chk->snd_count = 0;
chk->flags = 0;
chk->asoc = &stcb->asoc;
chk->data = cookie;
chk->whoTo = chk->asoc->primary_destination;
atomic_add_int(&chk->whoTo->ref_count, 1);
TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
chk->asoc->ctrl_queue_cnt++;
return (0);
}
void
sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
struct mbuf *m,
int offset,
int chk_length,
struct sctp_nets *net)
{
/*
* take a HB request and make it into a HB ack and send it.
*/
struct mbuf *outchain;
struct sctp_chunkhdr *chdr;
struct sctp_tmit_chunk *chk;
if (net == NULL)
/* must have a net pointer */
return;
outchain = sctp_m_copym(m, offset, chk_length, M_DONTWAIT);
if (outchain == NULL) {
/* gak out of memory */
return;
}
chdr = mtod(outchain, struct sctp_chunkhdr *);
chdr->chunk_type = SCTP_HEARTBEAT_ACK;
chdr->chunk_flags = 0;
if ((outchain->m_flags & M_PKTHDR) != M_PKTHDR) {
/* should not happen but we are cautious. */
struct mbuf *tmp;
tmp = sctp_get_mbuf_for_msg(1, 1, M_DONTWAIT, 1, MT_HEADER);
if (tmp == NULL) {
return;
}
tmp->m_len = 0;
tmp->m_pkthdr.rcvif = 0;
tmp->m_next = outchain;
outchain = tmp;
}
outchain->m_pkthdr.len = chk_length;
if (chk_length % 4) {
/* need pad */
uint32_t cpthis = 0;
int padlen;
padlen = 4 - (outchain->m_pkthdr.len % 4);
m_copyback(outchain, outchain->m_pkthdr.len, padlen,
(caddr_t)&cpthis);
}
sctp_alloc_a_chunk(stcb, chk);
if (chk == NULL) {
/* no memory */
sctp_m_freem(outchain);
return;
}
chk->copy_by_ref = 0;
chk->send_size = chk_length;
chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
chk->rec.chunk_id.can_take_data = 1;
chk->sent = SCTP_DATAGRAM_UNSENT;
chk->snd_count = 0;
chk->flags = 0;
chk->asoc = &stcb->asoc;
chk->data = outchain;
chk->whoTo = net;
atomic_add_int(&chk->whoTo->ref_count, 1);
TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
chk->asoc->ctrl_queue_cnt++;
}
int
sctp_send_cookie_ack(struct sctp_tcb *stcb)
{
/* formulate and queue a cookie-ack back to sender */
struct mbuf *cookie_ack;
struct sctp_chunkhdr *hdr;
struct sctp_tmit_chunk *chk;
cookie_ack = NULL;
SCTP_TCB_LOCK_ASSERT(stcb);
cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 1, M_DONTWAIT, 1, MT_HEADER);
if (cookie_ack == NULL) {
/* no mbuf's */
return (-1);
}
cookie_ack->m_data += SCTP_MIN_OVERHEAD;
sctp_alloc_a_chunk(stcb, chk);
if (chk == NULL) {
/* no memory */
sctp_m_freem(cookie_ack);
return (-1);
}
chk->copy_by_ref = 0;
chk->send_size = sizeof(struct sctp_chunkhdr);
chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
chk->rec.chunk_id.can_take_data = 1;
chk->sent = SCTP_DATAGRAM_UNSENT;
chk->snd_count = 0;
chk->flags = 0;
chk->asoc = &stcb->asoc;
chk->data = cookie_ack;
if (chk->asoc->last_control_chunk_from != NULL) {
chk->whoTo = chk->asoc->last_control_chunk_from;
} else {
chk->whoTo = chk->asoc->primary_destination;
}
atomic_add_int(&chk->whoTo->ref_count, 1);
hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
hdr->chunk_type = SCTP_COOKIE_ACK;
hdr->chunk_flags = 0;
hdr->chunk_length = htons(chk->send_size);
cookie_ack->m_pkthdr.len = cookie_ack->m_len = chk->send_size;
cookie_ack->m_pkthdr.rcvif = 0;
TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
chk->asoc->ctrl_queue_cnt++;
return (0);
}
int
sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
{
/* formulate and queue a SHUTDOWN-ACK back to the sender */
struct mbuf *m_shutdown_ack;
struct sctp_shutdown_ack_chunk *ack_cp;
struct sctp_tmit_chunk *chk;
m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 1, M_DONTWAIT, 1, MT_HEADER);
if (m_shutdown_ack == NULL) {
/* no mbuf's */
return (-1);
}
m_shutdown_ack->m_data += SCTP_MIN_OVERHEAD;
sctp_alloc_a_chunk(stcb, chk);
if (chk == NULL) {
/* no memory */
sctp_m_freem(m_shutdown_ack);
return (-1);
}
chk->copy_by_ref = 0;
chk->send_size = sizeof(struct sctp_chunkhdr);
chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
chk->rec.chunk_id.can_take_data = 1;
chk->sent = SCTP_DATAGRAM_UNSENT;
chk->snd_count = 0;
chk->flags = 0;
chk->asoc = &stcb->asoc;
chk->data = m_shutdown_ack;
chk->whoTo = net;
atomic_add_int(&net->ref_count, 1);
ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
ack_cp->ch.chunk_flags = 0;
ack_cp->ch.chunk_length = htons(chk->send_size);
m_shutdown_ack->m_pkthdr.len = m_shutdown_ack->m_len = chk->send_size;
m_shutdown_ack->m_pkthdr.rcvif = 0;
TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
chk->asoc->ctrl_queue_cnt++;
return (0);
}
int
sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
{
/* formulate and queue a SHUTDOWN to the sender */
struct mbuf *m_shutdown;
struct sctp_shutdown_chunk *shutdown_cp;
struct sctp_tmit_chunk *chk;
m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 1, M_DONTWAIT, 1, MT_HEADER);
if (m_shutdown == NULL) {
/* no mbuf's */
return (-1);
}
m_shutdown->m_data += SCTP_MIN_OVERHEAD;
sctp_alloc_a_chunk(stcb, chk);
if (chk == NULL) {
/* no memory */
sctp_m_freem(m_shutdown);
return (-1);
}
chk->copy_by_ref = 0;
chk->send_size = sizeof(struct sctp_shutdown_chunk);
chk->rec.chunk_id.id = SCTP_SHUTDOWN;
chk->rec.chunk_id.can_take_data = 1;
chk->sent = SCTP_DATAGRAM_UNSENT;
chk->snd_count = 0;
chk->flags = 0;
chk->asoc = &stcb->asoc;
chk->data = m_shutdown;
chk->whoTo = net;
atomic_add_int(&net->ref_count, 1);
shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
shutdown_cp->ch.chunk_flags = 0;
shutdown_cp->ch.chunk_length = htons(chk->send_size);
shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
m_shutdown->m_pkthdr.len = m_shutdown->m_len = chk->send_size;
m_shutdown->m_pkthdr.rcvif = 0;
TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
chk->asoc->ctrl_queue_cnt++;
return (0);
}
int
sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net)
{
/*
* formulate and queue an ASCONF to the peer ASCONF parameters
* should be queued on the assoc queue
*/
struct sctp_tmit_chunk *chk;
struct mbuf *m_asconf;
struct sctp_asconf_chunk *acp;
SCTP_TCB_LOCK_ASSERT(stcb);
/* compose an ASCONF chunk, maximum length is PMTU */
m_asconf = sctp_compose_asconf(stcb);
if (m_asconf == NULL) {
return (-1);
}
acp = mtod(m_asconf, struct sctp_asconf_chunk *);
sctp_alloc_a_chunk(stcb, chk);
if (chk == NULL) {
/* no memory */
sctp_m_freem(m_asconf);
return (-1);
}
chk->copy_by_ref = 0;
chk->data = m_asconf;
chk->send_size = m_asconf->m_pkthdr.len;
chk->rec.chunk_id.id = SCTP_ASCONF;
chk->rec.chunk_id.can_take_data = 0;
chk->sent = SCTP_DATAGRAM_UNSENT;
chk->snd_count = 0;
chk->flags = 0;
chk->asoc = &stcb->asoc;
chk->whoTo = chk->asoc->primary_destination;
atomic_add_int(&chk->whoTo->ref_count, 1);
TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
chk->asoc->ctrl_queue_cnt++;
return (0);
}
int
sctp_send_asconf_ack(struct sctp_tcb *stcb, uint32_t retrans)
{
/*
* formulate and queue a asconf-ack back to sender the asconf-ack
* must be stored in the tcb
*/
struct sctp_tmit_chunk *chk;
struct mbuf *m_ack;
SCTP_TCB_LOCK_ASSERT(stcb);
/* is there a asconf-ack mbuf chain to send? */
if (stcb->asoc.last_asconf_ack_sent == NULL) {
return (-1);
}
/* copy the asconf_ack */
/*
* Supposedly the m_copypacket is a optimzation, use it if we can.
*/
if (stcb->asoc.last_asconf_ack_sent->m_flags & M_PKTHDR) {
m_ack = m_copypacket(stcb->asoc.last_asconf_ack_sent, M_DONTWAIT);
} else
m_ack = m_copy(stcb->asoc.last_asconf_ack_sent, 0, M_COPYALL);
if (m_ack == NULL) {
/* couldn't copy it */
return (-1);
}
sctp_alloc_a_chunk(stcb, chk);
if (chk == NULL) {
/* no memory */
if (m_ack)
sctp_m_freem(m_ack);
return (-1);
}
chk->copy_by_ref = 0;
/* figure out where it goes to */
if (retrans) {
/* we're doing a retransmission */
if (stcb->asoc.used_alt_asconfack > 2) {
/* tried alternate nets already, go back */
chk->whoTo = NULL;
} else {
/* need to try and alternate net */
chk->whoTo = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
stcb->asoc.used_alt_asconfack++;
}
if (chk->whoTo == NULL) {
/* no alternate */
if (stcb->asoc.last_control_chunk_from == NULL)
chk->whoTo = stcb->asoc.primary_destination;
else
chk->whoTo = stcb->asoc.last_control_chunk_from;
stcb->asoc.used_alt_asconfack = 0;
}
} else {
/* normal case */
if (stcb->asoc.last_control_chunk_from == NULL)
chk->whoTo = stcb->asoc.primary_destination;
else
chk->whoTo = stcb->asoc.last_control_chunk_from;
stcb->asoc.used_alt_asconfack = 0;
}
chk->data = m_ack;
chk->send_size = m_ack->m_pkthdr.len;
chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
chk->rec.chunk_id.can_take_data = 1;
chk->sent = SCTP_DATAGRAM_UNSENT;
chk->snd_count = 0;
chk->flags = 0;
chk->asoc = &stcb->asoc;
atomic_add_int(&chk->whoTo->ref_count, 1);
TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
chk->asoc->ctrl_queue_cnt++;
return (0);
}
static int
sctp_chunk_retransmission(struct sctp_inpcb *inp,
struct sctp_tcb *stcb,
struct sctp_association *asoc,
int *cnt_out, struct timeval *now, int *now_filled)
{
/*
* send out one MTU of retransmission. If fast_retransmit is
* happening we ignore the cwnd. Otherwise we obey the cwnd and
* rwnd. For a Cookie or Asconf in the control chunk queue we
* retransmit them by themselves.
*
* For data chunks we will pick out the lowest TSN's in the sent_queue
* marked for resend and bundle them all together (up to a MTU of
* destination). The address to send to should have been
* selected/changed where the retransmission was marked (i.e. in FR
* or t3-timeout routines).
*/
struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
struct sctp_tmit_chunk *chk, *fwd;
struct mbuf *m, *endofchain;
struct sctphdr *shdr;
int asconf;
struct sctp_nets *net;
uint32_t tsns_sent = 0;
int no_fragmentflg, bundle_at, cnt_thru;
unsigned int mtu;
int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
struct sctp_auth_chunk *auth = NULL;
uint32_t auth_offset = 0;
uint32_t dmtu = 0;
SCTP_TCB_LOCK_ASSERT(stcb);
tmr_started = ctl_cnt = bundle_at = error = 0;
no_fragmentflg = 1;
asconf = 0;
fwd_tsn = 0;
*cnt_out = 0;
fwd = NULL;
endofchain = m = NULL;
#ifdef SCTP_AUDITING_ENABLED
sctp_audit_log(0xC3, 1);
#endif
if (TAILQ_EMPTY(&asoc->sent_queue)) {
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_OUTPUT1) {
printf("SCTP hits empty queue with cnt set to %d?\n",
asoc->sent_queue_retran_cnt);
}
#endif
asoc->sent_queue_cnt = 0;
asoc->sent_queue_cnt_removeable = 0;
}
TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
(chk->rec.chunk_id.id == SCTP_ASCONF) ||
(chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
(chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
if (chk != asoc->str_reset) {
/*
* not eligible for retran if its
* not ours
*/
continue;
}
}
ctl_cnt++;
if (chk->rec.chunk_id.id == SCTP_ASCONF) {
no_fragmentflg = 1;
asconf = 1;
}
if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
fwd_tsn = 1;
fwd = chk;
}
/*
* Add an AUTH chunk, if chunk requires it save the
* offset into the chain for AUTH
*/
if ((auth == NULL) &&
(sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
stcb->asoc.peer_auth_chunks))) {
m = sctp_add_auth_chunk(m, &endofchain,
&auth, &auth_offset,
stcb,
chk->rec.chunk_id.id);
}
m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
break;
}
}
one_chunk = 0;
cnt_thru = 0;
/* do we have control chunks to retransmit? */
if (m != NULL) {
/* Start a timer no matter if we suceed or fail */
if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
} else if (chk->rec.chunk_id.id == SCTP_ASCONF)
sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
M_PREPEND(m, sizeof(struct sctphdr), M_DONTWAIT);
if (m == NULL) {
return (ENOBUFS);
}
shdr = mtod(m, struct sctphdr *);
shdr->src_port = inp->sctp_lport;
shdr->dest_port = stcb->rport;
shdr->v_tag = htonl(stcb->asoc.peer_vtag);
shdr->checksum = 0;
auth_offset += sizeof(struct sctphdr);
chk->snd_count++; /* update our count */
if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
(struct sockaddr *)&chk->whoTo->ro._l_addr, m, auth_offset,
auth, no_fragmentflg, 0, NULL, asconf))) {
SCTP_STAT_INCR(sctps_lowlevelerr);
return (error);
}
m = endofchain = NULL;
auth = NULL;
auth_offset = 0;
/*
* We don't want to mark the net->sent time here since this
* we use this for HB and retrans cannot measure RTT
*/
/* SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
*cnt_out += 1;
chk->sent = SCTP_DATAGRAM_SENT;
sctp_ucount_decr(asoc->sent_queue_retran_cnt);
if (fwd_tsn == 0) {
return (0);
} else {
/* Clean up the fwd-tsn list */
sctp_clean_up_ctl(stcb, asoc);
return (0);
}
}
/*
* Ok, it is just data retransmission we need to do or that and a
* fwd-tsn with it all.
*/
if (TAILQ_EMPTY(&asoc->sent_queue)) {
return (-1);
}
if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
(SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
/* not yet open, resend the cookie and that is it */
return (1);
}
#ifdef SCTP_AUDITING_ENABLED
sctp_auditing(20, inp, stcb, NULL);
#endif
TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
if (chk->sent != SCTP_DATAGRAM_RESEND) {
/* No, not sent to this net or not ready for rtx */
continue;
}
/* pick up the net */
net = chk->whoTo;
if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
mtu = (net->mtu - SCTP_MIN_OVERHEAD);
} else {
mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
}
if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
/* No room in peers rwnd */
uint32_t tsn;
tsn = asoc->last_acked_seq + 1;
if (tsn == chk->rec.data.TSN_seq) {
/*
* we make a special exception for this
* case. The peer has no rwnd but is missing
* the lowest chunk.. which is probably what
* is holding up the rwnd.
*/
goto one_chunk_around;
}
return (1);
}
one_chunk_around:
if (asoc->peers_rwnd < mtu) {
one_chunk = 1;
}
#ifdef SCTP_AUDITING_ENABLED
sctp_audit_log(0xC3, 2);
#endif
bundle_at = 0;
m = NULL;
net->fast_retran_ip = 0;
if (chk->rec.data.doing_fast_retransmit == 0) {
/*
* if no FR in progress skip destination that have
* flight_size > cwnd.
*/
if (net->flight_size >= net->cwnd) {
continue;
}
} else {
/*
* Mark the destination net to have FR recovery
* limits put on it.
*/
net->fast_retran_ip = 1;
}
/*
* if no AUTH is yet included and this chunk requires it,
* make sure to account for it. We don't apply the size
* until the AUTH chunk is actually added below in case
* there is no room for this chunk.
*/
if ((auth == NULL) &&
sctp_auth_is_required_chunk(SCTP_DATA,
stcb->asoc.peer_auth_chunks)) {
dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
} else
dmtu = 0;
if ((chk->send_size <= (mtu - dmtu)) ||
(chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
/* ok we will add this one */
if ((auth == NULL) &&
(sctp_auth_is_required_chunk(SCTP_DATA,
stcb->asoc.peer_auth_chunks))) {
m = sctp_add_auth_chunk(m, &endofchain,
&auth, &auth_offset,
stcb, SCTP_DATA);
}
m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
if (m == NULL) {
return (ENOMEM);
}
/* Do clear IP_DF ? */
if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
no_fragmentflg = 0;
}
/* upate our MTU size */
if (mtu > (chk->send_size + dmtu))
mtu -= (chk->send_size + dmtu);
else
mtu = 0;
data_list[bundle_at++] = chk;
if (one_chunk && (asoc->total_flight <= 0)) {
SCTP_STAT_INCR(sctps_windowprobed);
chk->rec.data.state_flags |= SCTP_WINDOW_PROBE;
}
}
if (one_chunk == 0) {
/*
* now are there anymore forward from chk to pick
* up?
*/
fwd = TAILQ_NEXT(chk, sctp_next);
while (fwd) {
if (fwd->sent != SCTP_DATAGRAM_RESEND) {
/* Nope, not for retran */
fwd = TAILQ_NEXT(fwd, sctp_next);
continue;
}
if (fwd->whoTo != net) {
/* Nope, not the net in question */
fwd = TAILQ_NEXT(fwd, sctp_next);
continue;
}
if ((auth == NULL) &&
sctp_auth_is_required_chunk(SCTP_DATA,
stcb->asoc.peer_auth_chunks)) {
dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
} else
dmtu = 0;
if (fwd->send_size <= (mtu - dmtu)) {
if ((auth == NULL) &&
(sctp_auth_is_required_chunk(SCTP_DATA,
stcb->asoc.peer_auth_chunks))) {
m = sctp_add_auth_chunk(m,
&endofchain,
&auth, &auth_offset,
stcb,
SCTP_DATA);
}
m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
if (m == NULL) {
return (ENOMEM);
}
/* Do clear IP_DF ? */
if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
no_fragmentflg = 0;
}
/* upate our MTU size */
if (mtu > (fwd->send_size + dmtu))
mtu -= (fwd->send_size + dmtu);
else
mtu = 0;
data_list[bundle_at++] = fwd;
if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
break;
}
fwd = TAILQ_NEXT(fwd, sctp_next);
} else {
/* can't fit so we are done */
break;
}
}
}
/* Is there something to send for this destination? */
if (m) {
/*
* No matter if we fail/or suceed we should start a
* timer. A failure is like a lost IP packet :-)
*/
if (!callout_pending(&net->rxt_timer.timer)) {
/*
* no timer running on this destination
* restart it.
*/
sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
tmr_started = 1;
}
M_PREPEND(m, sizeof(struct sctphdr), M_DONTWAIT);
if (m == NULL) {
return (ENOBUFS);
}
shdr = mtod(m, struct sctphdr *);
shdr->src_port = inp->sctp_lport;
shdr->dest_port = stcb->rport;
shdr->v_tag = htonl(stcb->asoc.peer_vtag);
shdr->checksum = 0;
auth_offset += sizeof(struct sctphdr);
/* Now lets send it, if there is anything to send :> */
if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
(struct sockaddr *)&net->ro._l_addr, m, auth_offset,
auth, no_fragmentflg, 0, NULL, asconf))) {
/* error, we could not output */
SCTP_STAT_INCR(sctps_lowlevelerr);
return (error);
}
m = endofchain = NULL;
auth = NULL;
auth_offset = 0;
/* For HB's */
/*
* We don't want to mark the net->sent time here
* since this we use this for HB and retrans cannot
* measure RTT
*/
/* SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
/* For auto-close */
cnt_thru++;
if (*now_filled == 0) {
SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
*now = asoc->time_last_sent;
*now_filled = 1;
} else {
asoc->time_last_sent = *now;
}
*cnt_out += bundle_at;
#ifdef SCTP_AUDITING_ENABLED
sctp_audit_log(0xC4, bundle_at);
#endif
if (bundle_at) {
tsns_sent = data_list[0]->rec.data.TSN_seq;
}
for (i = 0; i < bundle_at; i++) {
SCTP_STAT_INCR(sctps_sendretransdata);
data_list[i]->sent = SCTP_DATAGRAM_SENT;
/*
* When we have a revoked data, and we
* retransmit it, then we clear the revoked
* flag since this flag dictates if we
* subtracted from the fs
*/
data_list[i]->rec.data.chunk_was_revoked = 0;
data_list[i]->snd_count++;
sctp_ucount_decr(asoc->sent_queue_retran_cnt);
/* record the time */
data_list[i]->sent_rcv_time = asoc->time_last_sent;
if (asoc->sent_queue_retran_cnt < 0) {
asoc->sent_queue_retran_cnt = 0;
}
#ifdef SCTP_FLIGHT_LOGGING
sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
data_list[i]->whoTo->flight_size,
data_list[i]->book_size,
(uintptr_t) stcb,
data_list[i]->rec.data.TSN_seq);
#endif
net->flight_size += data_list[i]->book_size;
asoc->total_flight += data_list[i]->book_size;
if (data_list[i]->book_size_scale) {
/*
* need to double the book size on
* this one
*/
data_list[i]->book_size_scale = 0;
data_list[i]->book_size *= 2;
} else {
sctp_ucount_incr(asoc->total_flight_count);
#ifdef SCTP_LOG_RWND
sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
asoc->peers_rwnd, data_list[i]->send_size, sctp_peer_chunk_oh);
#endif
asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
(uint32_t) (data_list[i]->send_size +
sctp_peer_chunk_oh));
}
if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
/* SWS sender side engages */
asoc->peers_rwnd = 0;
}
if ((i == 0) &&
(data_list[i]->rec.data.doing_fast_retransmit)) {
SCTP_STAT_INCR(sctps_sendfastretrans);
if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
(tmr_started == 0)) {
/*
* ok we just fast-retrans'd
* the lowest TSN, i.e the
* first on the list. In
* this case we want to give
* some more time to get a
* SACK back without a
* t3-expiring.
*/
sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
}
}
}
#ifdef SCTP_CWND_LOGGING
sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
#endif
#ifdef SCTP_AUDITING_ENABLED
sctp_auditing(21, inp, stcb, NULL);
#endif
} else {
/* None will fit */
return (1);
}
if (asoc->sent_queue_retran_cnt <= 0) {
/* all done we have no more to retran */
asoc->sent_queue_retran_cnt = 0;
break;
}
if (one_chunk) {
/* No more room in rwnd */
return (1);
}
/* stop the for loop here. we sent out a packet */
break;
}
return (0);
}
static int
sctp_timer_validation(struct sctp_inpcb *inp,
struct sctp_tcb *stcb,
struct sctp_association *asoc,
int ret)
{
struct sctp_nets *net;
/* Validate that a timer is running somewhere */
TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
if (callout_pending(&net->rxt_timer.timer)) {
/* Here is a timer */
return (ret);
}
}
SCTP_TCB_LOCK_ASSERT(stcb);
/* Gak, we did not have a timer somewhere */
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_OUTPUT3) {
printf("Deadlock avoided starting timer on a dest at retran\n");
}
#endif
sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
return (ret);
}
int
sctp_chunk_output(struct sctp_inpcb *inp,
struct sctp_tcb *stcb,
int from_where)
{
/*
* Ok this is the generic chunk service queue. we must do the
* following: - See if there are retransmits pending, if so we must
* do these first and return. - Service the stream queue that is
* next, moving any message (note I must get a complete message i.e.
* FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
* TSN's - Check to see if the cwnd/rwnd allows any output, if so we
* go ahead and fomulate and send the low level chunks. Making sure
* to combine any control in the control chunk queue also.
*/
struct sctp_association *asoc;
struct sctp_nets *net;
int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0,
burst_cnt = 0, burst_limit = 0;
struct timeval now;
int now_filled = 0;
int cwnd_full = 0;
int nagle_on = 0;
int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
int un_sent = 0;
asoc = &stcb->asoc;
if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
nagle_on = 0;
} else {
nagle_on = 1;
}
}
SCTP_TCB_LOCK_ASSERT(stcb);
un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
if ((un_sent <= 0) &&
(TAILQ_EMPTY(&asoc->control_send_queue)) &&
(asoc->sent_queue_retran_cnt == 0)) {
/* Nothing to do unless there is something to be sent left */
return (error);
}
/*
* Do we have something to send, data or control AND a sack timer
* running, if so piggy-back the sack.
*/
if (callout_pending(&stcb->asoc.dack_timer.timer)) {
sctp_send_sack(stcb);
callout_stop(&stcb->asoc.dack_timer.timer);
}
while (asoc->sent_queue_retran_cnt) {
/*
* Ok, it is retransmission time only, we send out only ONE
* packet with a single call off to the retran code.
*/
if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
/*
* Special hook for handling cookiess discarded by
* peer that carried data. Send cookie-ack only and
* then the next call with get the retran's.
*/
(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
&cwnd_full, from_where,
&now, &now_filled, frag_point);
return (0);
} else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
/* if its not from a HB then do it */
ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled);
} else {
/*
* its from any other place, we don't allow retran
* output (only control)
*/
ret = 1;
}
if (ret > 0) {
/* Can't send anymore */
/*
* now lets push out control by calling med-level
* output once. this assures that we WILL send HB's
* if queued too.
*/
(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
&cwnd_full, from_where,
&now, &now_filled, frag_point);
#ifdef SCTP_AUDITING_ENABLED
sctp_auditing(8, inp, stcb, NULL);
#endif
return (sctp_timer_validation(inp, stcb, asoc, ret));
}
if (ret < 0) {
/*
* The count was off.. retran is not happening so do
* the normal retransmission.
*/
#ifdef SCTP_AUDITING_ENABLED
sctp_auditing(9, inp, stcb, NULL);
#endif
break;
}
if (from_where == SCTP_OUTPUT_FROM_T3) {
/* Only one transmission allowed out of a timeout */
#ifdef SCTP_AUDITING_ENABLED
sctp_auditing(10, inp, stcb, NULL);
#endif
/* Push out any control */
(void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, &cwnd_full, from_where,
&now, &now_filled, frag_point);
return (ret);
}
if ((num_out == 0) && (ret == 0)) {
/* No more retrans to send */
break;
}
}
#ifdef SCTP_AUDITING_ENABLED
sctp_auditing(12, inp, stcb, NULL);
#endif
/* Check for bad destinations, if they exist move chunks around. */
burst_limit = asoc->max_burst;
TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) ==
SCTP_ADDR_NOT_REACHABLE) {
/*
* if possible move things off of this address we
* still may send below due to the dormant state but
* we try to find an alternate address to send to
* and if we have one we move all queued data on the
* out wheel to this alternate address.
*/
if (net->ref_count > 1)
sctp_move_to_an_alt(stcb, asoc, net);
} else {
/*
* if ((asoc->sat_network) || (net->addr_is_local))
* { burst_limit = asoc->max_burst *
* SCTP_SAT_NETWORK_BURST_INCR; }
*/
if (sctp_use_cwnd_based_maxburst) {
if ((net->flight_size + (burst_limit * net->mtu)) < net->cwnd) {
int old_cwnd;
if (net->ssthresh < net->cwnd)
net->ssthresh = net->cwnd;
old_cwnd = net->cwnd;
net->cwnd = (net->flight_size + (burst_limit * net->mtu));
#ifdef SCTP_CWND_MONITOR
sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_BRST);
#endif
#ifdef SCTP_LOG_MAXBURST
sctp_log_maxburst(stcb, net, 0, burst_limit, SCTP_MAX_BURST_APPLIED);
#endif
SCTP_STAT_INCR(sctps_maxburstqueued);
}
net->fast_retran_ip = 0;
} else {
if (net->flight_size == 0) {
/* Should be decaying the cwnd here */
;
}
}
}
}
burst_cnt = 0;
cwnd_full = 0;
do {
error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
&reason_code, 0, &cwnd_full, from_where,
&now, &now_filled, frag_point);
if (error) {
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_OUTPUT1) {
printf("Error %d was returned from med-c-op\n", error);
}
#endif
#ifdef SCTP_LOG_MAXBURST
sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
#endif
#ifdef SCTP_CWND_LOGGING
sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
#endif
break;
}
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_OUTPUT3) {
printf("m-c-o put out %d\n", num_out);
}
#endif
tot_out += num_out;
burst_cnt++;
#ifdef SCTP_CWND_LOGGING
sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
if (num_out == 0) {
sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
}
#endif
if (nagle_on) {
/*
* When nagle is on, we look at how much is un_sent,
* then if its smaller than an MTU and we have data
* in flight we stop.
*/
un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count)
* sizeof(struct sctp_data_chunk)));
if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
(stcb->asoc.total_flight > 0)) {
break;
}
}
if (TAILQ_EMPTY(&asoc->control_send_queue) &&
TAILQ_EMPTY(&asoc->send_queue) &&
TAILQ_EMPTY(&asoc->out_wheel)) {
/* Nothing left to send */
break;
}
if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
/* Nothing left to send */
break;
}
} while (num_out && (sctp_use_cwnd_based_maxburst ||
(burst_cnt < burst_limit)));
if (sctp_use_cwnd_based_maxburst == 0) {
if (burst_cnt >= burst_limit) {
SCTP_STAT_INCR(sctps_maxburstqueued);
asoc->burst_limit_applied = 1;
#ifdef SCTP_LOG_MAXBURST
sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
#endif
} else {
asoc->burst_limit_applied = 0;
}
}
#ifdef SCTP_CWND_LOGGING
sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
#endif
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_OUTPUT1) {
printf("Ok, we have put out %d chunks\n", tot_out);
}
#endif
/*
* Now we need to clean up the control chunk chain if a ECNE is on
* it. It must be marked as UNSENT again so next call will continue
* to send it until such time that we get a CWR, to remove it.
*/
if (stcb->asoc.ecn_echo_cnt_onq)
sctp_fix_ecn_echo(asoc);
return (error);
}
int
sctp_output(inp, m, addr, control, p, flags)
struct sctp_inpcb *inp;
struct mbuf *m;
struct sockaddr *addr;
struct mbuf *control;
struct thread *p;
int flags;
{
if (inp == NULL) {
return (EINVAL);
}
if (inp->sctp_socket == NULL) {
return (EINVAL);
}
return (sctp_sosend(inp->sctp_socket,
addr,
(struct uio *)NULL,
m,
control,
flags,
p));
}
void
send_forward_tsn(struct sctp_tcb *stcb,
struct sctp_association *asoc)
{
struct sctp_tmit_chunk *chk;
struct sctp_forward_tsn_chunk *fwdtsn;
SCTP_TCB_LOCK_ASSERT(stcb);
TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
/* mark it to unsent */
chk->sent = SCTP_DATAGRAM_UNSENT;
chk->snd_count = 0;
/* Do we correct its output location? */
if (chk->whoTo != asoc->primary_destination) {
sctp_free_remote_addr(chk->whoTo);
chk->whoTo = asoc->primary_destination;
atomic_add_int(&chk->whoTo->ref_count, 1);
}
goto sctp_fill_in_rest;
}
}
/* Ok if we reach here we must build one */
sctp_alloc_a_chunk(stcb, chk);
if (chk == NULL) {
return;
}
chk->copy_by_ref = 0;
chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
chk->rec.chunk_id.can_take_data = 0;
chk->asoc = asoc;
chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
if (chk->data == NULL) {
atomic_subtract_int(&chk->whoTo->ref_count, 1);
sctp_free_a_chunk(stcb, chk);
return;
}
chk->data->m_data += SCTP_MIN_OVERHEAD;
chk->sent = SCTP_DATAGRAM_UNSENT;
chk->snd_count = 0;
chk->whoTo = asoc->primary_destination;
atomic_add_int(&chk->whoTo->ref_count, 1);
TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
asoc->ctrl_queue_cnt++;
sctp_fill_in_rest:
/*
* Here we go through and fill out the part that deals with
* stream/seq of the ones we skip.
*/
chk->data->m_pkthdr.len = chk->data->m_len = 0;
{
struct sctp_tmit_chunk *at, *tp1, *last;
struct sctp_strseq *strseq;
unsigned int cnt_of_space, i, ovh;
unsigned int space_needed;
unsigned int cnt_of_skipped = 0;
TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
if (at->sent != SCTP_FORWARD_TSN_SKIP) {
/* no more to look at */
break;
}
if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
/* We don't report these */
continue;
}
cnt_of_skipped++;
}
space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
(cnt_of_skipped * sizeof(struct sctp_strseq)));
cnt_of_space = M_TRAILINGSPACE(chk->data);
if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
ovh = SCTP_MIN_OVERHEAD;
} else {
ovh = SCTP_MIN_V4_OVERHEAD;
}
if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
/* trim to a mtu size */
cnt_of_space = asoc->smallest_mtu - ovh;
}
if (cnt_of_space < space_needed) {
/*
* ok we must trim down the chunk by lowering the
* advance peer ack point.
*/
cnt_of_skipped = (cnt_of_space -
((sizeof(struct sctp_forward_tsn_chunk)) /
sizeof(struct sctp_strseq)));
/*
* Go through and find the TSN that will be the one
* we report.
*/
at = TAILQ_FIRST(&asoc->sent_queue);
for (i = 0; i < cnt_of_skipped; i++) {
tp1 = TAILQ_NEXT(at, sctp_next);
at = tp1;
}
last = at;
/*
* last now points to last one I can report, update
* peer ack point
*/
asoc->advanced_peer_ack_point = last->rec.data.TSN_seq;
space_needed -= (cnt_of_skipped * sizeof(struct sctp_strseq));
}
chk->send_size = space_needed;
/* Setup the chunk */
fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
fwdtsn->ch.chunk_length = htons(chk->send_size);
fwdtsn->ch.chunk_flags = 0;
fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
fwdtsn->new_cumulative_tsn = htonl(asoc->advanced_peer_ack_point);
chk->send_size = (sizeof(struct sctp_forward_tsn_chunk) +
(cnt_of_skipped * sizeof(struct sctp_strseq)));
chk->data->m_pkthdr.len = chk->data->m_len = chk->send_size;
fwdtsn++;
/*
* Move pointer to after the fwdtsn and transfer to the
* strseq pointer.
*/
strseq = (struct sctp_strseq *)fwdtsn;
/*
* Now populate the strseq list. This is done blindly
* without pulling out duplicate stream info. This is
* inefficent but won't harm the process since the peer will
* look at these in sequence and will thus release anything.
* It could mean we exceed the PMTU and chop off some that
* we could have included.. but this is unlikely (aka 1432/4
* would mean 300+ stream seq's would have to be reported in
* one FWD-TSN. With a bit of work we can later FIX this to
* optimize and pull out duplcates.. but it does add more
* overhead. So for now... not!
*/
at = TAILQ_FIRST(&asoc->sent_queue);
for (i = 0; i < cnt_of_skipped; i++) {
tp1 = TAILQ_NEXT(at, sctp_next);
if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
/* We don't report these */
i--;
at = tp1;
continue;
}
strseq->stream = ntohs(at->rec.data.stream_number);
strseq->sequence = ntohs(at->rec.data.stream_seq);
strseq++;
at = tp1;
}
}
return;
}
void
sctp_send_sack(struct sctp_tcb *stcb)
{
/*
* Queue up a SACK in the control queue. We must first check to see
* if a SACK is somehow on the control queue. If so, we will take
* and and remove the old one.
*/
struct sctp_association *asoc;
struct sctp_tmit_chunk *chk, *a_chk;
struct sctp_sack_chunk *sack;
struct sctp_gap_ack_block *gap_descriptor;
struct sack_track *selector;
int mergeable = 0;
int offset;
caddr_t limit;
uint32_t *dup;
int limit_reached = 0;
unsigned int i, jstart, siz, j;
unsigned int num_gap_blocks = 0, space;
int num_dups = 0;
int space_req;
a_chk = NULL;
asoc = &stcb->asoc;
SCTP_TCB_LOCK_ASSERT(stcb);
if (asoc->last_data_chunk_from == NULL) {
/* Hmm we never received anything */
return;
}
sctp_set_rwnd(stcb, asoc);
TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
if (chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) {
/* Hmm, found a sack already on queue, remove it */
TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
asoc->ctrl_queue_cnt++;
a_chk = chk;
if (a_chk->data) {
sctp_m_freem(a_chk->data);
a_chk->data = NULL;
}
sctp_free_remote_addr(a_chk->whoTo);
a_chk->whoTo = NULL;
break;
}
}
if (a_chk == NULL) {
sctp_alloc_a_chunk(stcb, a_chk);
if (a_chk == NULL) {
/* No memory so we drop the idea, and set a timer */
sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
sctp_timer_start(SCTP_TIMER_TYPE_RECV,
stcb->sctp_ep, stcb, NULL);
return;
}
a_chk->copy_by_ref = 0;
/* a_chk->rec.chunk_id.id = SCTP_SELECTIVE_ACK; */
a_chk->rec.chunk_id.id = SCTP_SELECTIVE_ACK;
a_chk->rec.chunk_id.can_take_data = 1;
}
a_chk->asoc = asoc;
a_chk->snd_count = 0;
a_chk->send_size = 0; /* fill in later */
a_chk->sent = SCTP_DATAGRAM_UNSENT;
if ((asoc->numduptsns) ||
(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_NOT_REACHABLE)
) {
/*
* Ok, we have some duplicates or the destination for the
* sack is unreachable, lets see if we can select an
* alternate than asoc->last_data_chunk_from
*/
if ((!(asoc->last_data_chunk_from->dest_state &
SCTP_ADDR_NOT_REACHABLE)) &&
(asoc->used_alt_onsack > asoc->numnets)) {
/* We used an alt last time, don't this time */
a_chk->whoTo = NULL;
} else {
asoc->used_alt_onsack++;
a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
}
if (a_chk->whoTo == NULL) {
/* Nope, no alternate */
a_chk->whoTo = asoc->last_data_chunk_from;
asoc->used_alt_onsack = 0;
}
} else {
/*
* No duplicates so we use the last place we received data
* from.
*/
asoc->used_alt_onsack = 0;
a_chk->whoTo = asoc->last_data_chunk_from;
}
if (a_chk->whoTo) {
atomic_add_int(&a_chk->whoTo->ref_count, 1);
}
if (asoc->highest_tsn_inside_map == asoc->cumulative_tsn) {
/* no gaps */
space_req = sizeof(struct sctp_sack_chunk);
} else {
/* gaps get a cluster */
space_req = MCLBYTES;
}
/* Ok now lets formulate a MBUF with our sack */
a_chk->data = sctp_get_mbuf_for_msg(space_req, 1, M_DONTWAIT, 1, MT_DATA);
if ((a_chk->data == NULL) ||
(a_chk->whoTo == NULL)) {
/* rats, no mbuf memory */
if (a_chk->data) {
/* was a problem with the destination */
sctp_m_freem(a_chk->data);
a_chk->data = NULL;
}
if (a_chk->whoTo)
atomic_subtract_int(&a_chk->whoTo->ref_count, 1);
sctp_free_a_chunk(stcb, a_chk);
sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
sctp_timer_start(SCTP_TIMER_TYPE_RECV,
stcb->sctp_ep, stcb, NULL);
return;
}
/* ok, lets go through and fill it in */
a_chk->data->m_data += SCTP_MIN_OVERHEAD;
space = M_TRAILINGSPACE(a_chk->data);
if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
}
limit = mtod(a_chk->data, caddr_t);
limit += space;
sack = mtod(a_chk->data, struct sctp_sack_chunk *);
sack->ch.chunk_type = SCTP_SELECTIVE_ACK;
/* 0x01 is used by nonce for ecn */
sack->ch.chunk_flags = (asoc->receiver_nonce_sum & SCTP_SACK_NONCE_SUM);
if (sctp_cmt_on_off && sctp_cmt_use_dac) {
/*
* CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
* received, then set high bit to 1, else 0. Reset
* pkts_rcvd.
*/
sack->ch.chunk_flags |= (asoc->cmt_dac_pkts_rcvd << 6);
asoc->cmt_dac_pkts_rcvd = 0;
}
sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
sack->sack.a_rwnd = htonl(asoc->my_rwnd);
asoc->my_last_reported_rwnd = asoc->my_rwnd;
/* reset the readers interpretation */
stcb->freed_by_sorcv_sincelast = 0;
gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
if (asoc->cumulative_tsn < asoc->mapping_array_base_tsn) {
offset = 1;
/*
* cum-ack behind the mapping array, so we start and use all
* entries.
*/
jstart = 0;
} else {
offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
/*
* we skip the first one when the cum-ack is at or above the
* mapping array base.
*/
jstart = 1;
}
if (compare_with_wrap(asoc->highest_tsn_inside_map, asoc->cumulative_tsn, MAX_TSN)) {
/* we have a gap .. maybe */
for (i = 0; i < siz; i++) {
selector = &sack_array[asoc->mapping_array[i]];
if (mergeable && selector->right_edge) {
/*
* Backup, left and right edges were ok to
* merge.
*/
num_gap_blocks--;
gap_descriptor--;
}
if (selector->num_entries == 0)
mergeable = 0;
else {
for (j = jstart; j < selector->num_entries; j++) {
if (mergeable && selector->right_edge) {
/*
* do a merge by NOT setting
* the left side
*/
mergeable = 0;
} else {
/*
* no merge, set the left
* side
*/
mergeable = 0;
gap_descriptor->start = htons((selector->gaps[j].start + offset));
}
gap_descriptor->end = htons((selector->gaps[j].end + offset));
num_gap_blocks++;
gap_descriptor++;
if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
/* no more room */
limit_reached = 1;
break;
}
}
if (selector->left_edge) {
mergeable = 1;
}
}
jstart = 0;
offset += 8;
}
if (num_gap_blocks == 0) {
/* reneged all chunks */
asoc->highest_tsn_inside_map = asoc->cumulative_tsn;
}
}
/* now we must add any dups we are going to report. */
if ((limit_reached == 0) && (asoc->numduptsns)) {
dup = (uint32_t *) gap_descriptor;
for (i = 0; i < asoc->numduptsns; i++) {
*dup = htonl(asoc->dup_tsns[i]);
dup++;
num_dups++;
if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
/* no more room */
break;
}
}
asoc->numduptsns = 0;
}
/*
* now that the chunk is prepared queue it to the control chunk
* queue.
*/
a_chk->send_size = (sizeof(struct sctp_sack_chunk) +
(num_gap_blocks * sizeof(struct sctp_gap_ack_block)) +
(num_dups * sizeof(int32_t)));
a_chk->data->m_pkthdr.len = a_chk->data->m_len = a_chk->send_size;
sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
sack->sack.num_dup_tsns = htons(num_dups);
sack->ch.chunk_length = htons(a_chk->send_size);
TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
asoc->ctrl_queue_cnt++;
SCTP_STAT_INCR(sctps_sendsacks);
return;
}
void
sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr)
{
struct mbuf *m_abort;
struct mbuf *m_out = NULL, *m_end = NULL;
struct sctp_abort_chunk *abort = NULL;
int sz;
uint32_t auth_offset = 0;
struct sctp_auth_chunk *auth = NULL;
struct sctphdr *shdr;
/*
* Add an AUTH chunk, if chunk requires it and save the offset into
* the chain for AUTH
*/
if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
stcb->asoc.peer_auth_chunks)) {
m_out = sctp_add_auth_chunk(m_out, &m_end, &auth, &auth_offset,
stcb, SCTP_ABORT_ASSOCIATION);
}
SCTP_TCB_LOCK_ASSERT(stcb);
m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 1, M_DONTWAIT, 1, MT_HEADER);
if (m_abort == NULL) {
/* no mbuf's */
if (m_out)
sctp_m_freem(m_out);
return;
}
/* link in any error */
m_abort->m_next = operr;
sz = 0;
if (operr) {
struct mbuf *n;
n = operr;
while (n) {
sz += n->m_len;
n = n->m_next;
}
}
m_abort->m_len = sizeof(*abort);
m_abort->m_pkthdr.len = m_abort->m_len + sz;
m_abort->m_pkthdr.rcvif = 0;
if (m_out == NULL) {
/* NO Auth chunk prepended, so reserve space in front */
m_abort->m_data += SCTP_MIN_OVERHEAD;
m_out = m_abort;
} else {
/* Put AUTH chunk at the front of the chain */
m_out->m_pkthdr.len += m_abort->m_pkthdr.len;
m_end->m_next = m_abort;
}
/* fill in the ABORT chunk */
abort = mtod(m_abort, struct sctp_abort_chunk *);
abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
abort->ch.chunk_flags = 0;
abort->ch.chunk_length = htons(sizeof(*abort) + sz);
/* prepend and fill in the SCTP header */
M_PREPEND(m_out, sizeof(struct sctphdr), M_DONTWAIT);
if (m_out == NULL) {
/* TSNH: no memory */
return;
}
shdr = mtod(m_out, struct sctphdr *);
shdr->src_port = stcb->sctp_ep->sctp_lport;
shdr->dest_port = stcb->rport;
shdr->v_tag = htonl(stcb->asoc.peer_vtag);
shdr->checksum = 0;
auth_offset += sizeof(struct sctphdr);
sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb,
stcb->asoc.primary_destination,
(struct sockaddr *)&stcb->asoc.primary_destination->ro._l_addr,
m_out, auth_offset, auth, 1, 0, NULL, 0);
SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
}
int
sctp_send_shutdown_complete(struct sctp_tcb *stcb,
struct sctp_nets *net)
{
/* formulate and SEND a SHUTDOWN-COMPLETE */
struct mbuf *m_shutdown_comp;
struct sctp_shutdown_complete_msg *comp_cp;
m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_complete_msg), 1, M_DONTWAIT, 1, MT_HEADER);
if (m_shutdown_comp == NULL) {
/* no mbuf's */
return (-1);
}
m_shutdown_comp->m_data += sizeof(struct ip6_hdr);
comp_cp = mtod(m_shutdown_comp, struct sctp_shutdown_complete_msg *);
comp_cp->shut_cmp.ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
comp_cp->shut_cmp.ch.chunk_flags = 0;
comp_cp->shut_cmp.ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
comp_cp->sh.src_port = stcb->sctp_ep->sctp_lport;
comp_cp->sh.dest_port = stcb->rport;
comp_cp->sh.v_tag = htonl(stcb->asoc.peer_vtag);
comp_cp->sh.checksum = 0;
m_shutdown_comp->m_pkthdr.len = m_shutdown_comp->m_len = sizeof(struct sctp_shutdown_complete_msg);
m_shutdown_comp->m_pkthdr.rcvif = 0;
sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
(struct sockaddr *)&net->ro._l_addr,
m_shutdown_comp, 0, NULL, 1, 0, NULL, 0);
SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
return (0);
}
int
sctp_send_shutdown_complete2(struct mbuf *m, int iphlen, struct sctphdr *sh)
{
/* formulate and SEND a SHUTDOWN-COMPLETE */
struct mbuf *mout;
struct ip *iph, *iph_out;
struct ip6_hdr *ip6, *ip6_out;
int offset_out;
struct sctp_shutdown_complete_msg *comp_cp;
mout = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_complete_msg), 1, M_DONTWAIT, 1, MT_HEADER);
if (mout == NULL) {
/* no mbuf's */
return (-1);
}
iph = mtod(m, struct ip *);
iph_out = NULL;
ip6_out = NULL;
offset_out = 0;
if (iph->ip_v == IPVERSION) {
mout->m_len = sizeof(struct ip) +
sizeof(struct sctp_shutdown_complete_msg);
mout->m_next = NULL;
iph_out = mtod(mout, struct ip *);
/* Fill in the IP header for the ABORT */
iph_out->ip_v = IPVERSION;
iph_out->ip_hl = (sizeof(struct ip) / 4);
iph_out->ip_tos = (u_char)0;
iph_out->ip_id = 0;
iph_out->ip_off = 0;
iph_out->ip_ttl = MAXTTL;
iph_out->ip_p = IPPROTO_SCTP;
iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
/* let IP layer calculate this */
iph_out->ip_sum = 0;
offset_out += sizeof(*iph_out);
comp_cp = (struct sctp_shutdown_complete_msg *)(
(caddr_t)iph_out + offset_out);
} else if (iph->ip_v == (IPV6_VERSION >> 4)) {
ip6 = (struct ip6_hdr *)iph;
mout->m_len = sizeof(struct ip6_hdr) +
sizeof(struct sctp_shutdown_complete_msg);
mout->m_next = NULL;
ip6_out = mtod(mout, struct ip6_hdr *);
/* Fill in the IPv6 header for the ABORT */
ip6_out->ip6_flow = ip6->ip6_flow;
ip6_out->ip6_hlim = ip6_defhlim;
ip6_out->ip6_nxt = IPPROTO_SCTP;
ip6_out->ip6_src = ip6->ip6_dst;
ip6_out->ip6_dst = ip6->ip6_src;
ip6_out->ip6_plen = mout->m_len;
offset_out += sizeof(*ip6_out);
comp_cp = (struct sctp_shutdown_complete_msg *)(
(caddr_t)ip6_out + offset_out);
} else {
/* Currently not supported. */
return (-1);
}
/* Now copy in and fill in the ABORT tags etc. */
comp_cp->sh.src_port = sh->dest_port;
comp_cp->sh.dest_port = sh->src_port;
comp_cp->sh.checksum = 0;
comp_cp->sh.v_tag = sh->v_tag;
comp_cp->shut_cmp.ch.chunk_flags = SCTP_HAD_NO_TCB;
comp_cp->shut_cmp.ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
comp_cp->shut_cmp.ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
mout->m_pkthdr.len = mout->m_len;
/* add checksum */
if ((sctp_no_csum_on_loopback) &&
(m->m_pkthdr.rcvif) &&
(m->m_pkthdr.rcvif->if_type == IFT_LOOP)) {
comp_cp->sh.checksum = 0;
} else {
comp_cp->sh.checksum = sctp_calculate_sum(mout, NULL, offset_out);
}
/* zap the rcvif, it should be null */
mout->m_pkthdr.rcvif = 0;
/* zap the stack pointer to the route */
if (iph_out != NULL) {
struct route ro;
bzero(&ro, sizeof ro);
/* set IPv4 length */
iph_out->ip_len = mout->m_pkthdr.len;
/* out it goes */
ip_output(mout, 0, &ro, IP_RAWOUTPUT, NULL
,NULL
);
/* Free the route if we got one back */
if (ro.ro_rt)
RTFREE(ro.ro_rt);
} else if (ip6_out != NULL) {
struct route_in6 ro;
bzero(&ro, sizeof(ro));
ip6_output(mout, NULL, &ro, 0, NULL, NULL
,NULL
);
/* Free the route if we got one back */
if (ro.ro_rt)
RTFREE(ro.ro_rt);
}
SCTP_STAT_INCR(sctps_sendpackets);
SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
return (0);
}
static struct sctp_nets *
sctp_select_hb_destination(struct sctp_tcb *stcb, struct timeval *now)
{
struct sctp_nets *net, *hnet;
int ms_goneby, highest_ms, state_overide = 0;
SCTP_GETTIME_TIMEVAL(now);
highest_ms = 0;
hnet = NULL;
SCTP_TCB_LOCK_ASSERT(stcb);
TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
if (
((net->dest_state & SCTP_ADDR_NOHB) && ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0)) ||
(net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)
) {
/*
* Skip this guy from consideration if HB is off AND
* its confirmed
*/
continue;
}
if (sctp_destination_is_reachable(stcb, (struct sockaddr *)&net->ro._l_addr) == 0) {
/* skip this dest net from consideration */
continue;
}
if (net->last_sent_time.tv_sec) {
/* Sent to so we subtract */
ms_goneby = (now->tv_sec - net->last_sent_time.tv_sec) * 1000;
} else
/* Never been sent to */
ms_goneby = 0x7fffffff;
/*
* When the address state is unconfirmed but still
* considered reachable, we HB at a higher rate. Once it
* goes confirmed OR reaches the "unreachable" state, thenw
* we cut it back to HB at a more normal pace.
*/
if ((net->dest_state & (SCTP_ADDR_UNCONFIRMED | SCTP_ADDR_NOT_REACHABLE)) == SCTP_ADDR_UNCONFIRMED) {
state_overide = 1;
} else {
state_overide = 0;
}
if ((((unsigned int)ms_goneby >= net->RTO) || (state_overide)) &&
(ms_goneby > highest_ms)) {
highest_ms = ms_goneby;
hnet = net;
}
}
if (hnet &&
((hnet->dest_state & (SCTP_ADDR_UNCONFIRMED | SCTP_ADDR_NOT_REACHABLE)) == SCTP_ADDR_UNCONFIRMED)) {
state_overide = 1;
} else {
state_overide = 0;
}
if (highest_ms && (((unsigned int)highest_ms >= hnet->RTO) || state_overide)) {
/*
* Found the one with longest delay bounds OR it is
* unconfirmed and still not marked unreachable.
*/
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_OUTPUT4) {
printf("net:%p is the hb winner -",
hnet);
if (hnet)
sctp_print_address((struct sockaddr *)&hnet->ro._l_addr);
else
printf(" none\n");
}
#endif
/* update the timer now */
hnet->last_sent_time = *now;
return (hnet);
}
/* Nothing to HB */
return (NULL);
}
int
sctp_send_hb(struct sctp_tcb *stcb, int user_req, struct sctp_nets *u_net)
{
struct sctp_tmit_chunk *chk;
struct sctp_nets *net;
struct sctp_heartbeat_chunk *hb;
struct timeval now;
struct sockaddr_in *sin;
struct sockaddr_in6 *sin6;
SCTP_TCB_LOCK_ASSERT(stcb);
if (user_req == 0) {
net = sctp_select_hb_destination(stcb, &now);
if (net == NULL) {
/*
* All our busy none to send to, just start the
* timer again.
*/
if (stcb->asoc.state == 0) {
return (0);
}
sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT,
stcb->sctp_ep,
stcb,
net);
return (0);
}
} else {
net = u_net;
if (net == NULL) {
return (0);
}
SCTP_GETTIME_TIMEVAL(&now);
}
sin = (struct sockaddr_in *)&net->ro._l_addr;
if (sin->sin_family != AF_INET) {
if (sin->sin_family != AF_INET6) {
/* huh */
return (0);
}
}
sctp_alloc_a_chunk(stcb, chk);
if (chk == NULL) {
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_OUTPUT4) {
printf("Gak, can't get a chunk for hb\n");
}
#endif
return (0);
}
chk->copy_by_ref = 0;
chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
chk->rec.chunk_id.can_take_data = 1;
chk->asoc = &stcb->asoc;
chk->send_size = sizeof(struct sctp_heartbeat_chunk);
chk->data = sctp_get_mbuf_for_msg(chk->send_size, 1, M_DONTWAIT, 1, MT_HEADER);
if (chk->data == NULL) {
sctp_free_a_chunk(stcb, chk);
return (0);
}
chk->data->m_data += SCTP_MIN_OVERHEAD;
chk->data->m_pkthdr.len = chk->data->m_len = chk->send_size;
chk->sent = SCTP_DATAGRAM_UNSENT;
chk->snd_count = 0;
chk->whoTo = net;
atomic_add_int(&chk->whoTo->ref_count, 1);
/* Now we have a mbuf that we can fill in with the details */
hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
/* fill out chunk header */
hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
hb->ch.chunk_flags = 0;
hb->ch.chunk_length = htons(chk->send_size);
/* Fill out hb parameter */
hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
/* Did our user request this one, put it in */
hb->heartbeat.hb_info.user_req = user_req;
hb->heartbeat.hb_info.addr_family = sin->sin_family;
hb->heartbeat.hb_info.addr_len = sin->sin_len;
if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
/*
* we only take from the entropy pool if the address is not
* confirmed.
*/
net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
} else {
net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
}
if (sin->sin_family == AF_INET) {
memcpy(hb->heartbeat.hb_info.address, &sin->sin_addr, sizeof(sin->sin_addr));
} else if (sin->sin_family == AF_INET6) {
/* We leave the scope the way it is in our lookup table. */
sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
memcpy(hb->heartbeat.hb_info.address, &sin6->sin6_addr, sizeof(sin6->sin6_addr));
} else {
/* huh compiler bug */
return (0);
}
/* ok we have a destination that needs a beat */
/* lets do the theshold management Qiaobing style */
if (sctp_threshold_management(stcb->sctp_ep, stcb, net,
stcb->asoc.max_send_times)) {
/*
* we have lost the association, in a way this is quite bad
* since we really are one less time since we really did not
* send yet. This is the down side to the Q's style as
* defined in the RFC and not my alternate style defined in
* the RFC.
*/
atomic_subtract_int(&chk->whoTo->ref_count, 1);
if (chk->data != NULL) {
sctp_m_freem(chk->data);
chk->data = NULL;
}
sctp_free_a_chunk(stcb, chk);
return (-1);
}
net->hb_responded = 0;
TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
stcb->asoc.ctrl_queue_cnt++;
SCTP_STAT_INCR(sctps_sendheartbeat);
/*
* Call directly med level routine to put out the chunk. It will
* always tumble out control chunks aka HB but it may even tumble
* out data too.
*/
return (1);
}
void
sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
uint32_t high_tsn)
{
struct sctp_association *asoc;
struct sctp_ecne_chunk *ecne;
struct sctp_tmit_chunk *chk;
asoc = &stcb->asoc;
SCTP_TCB_LOCK_ASSERT(stcb);
TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
/* found a previous ECN_ECHO update it if needed */
ecne = mtod(chk->data, struct sctp_ecne_chunk *);
ecne->tsn = htonl(high_tsn);
return;
}
}
/* nope could not find one to update so we must build one */
sctp_alloc_a_chunk(stcb, chk);
if (chk == NULL) {
return;
}
chk->copy_by_ref = 0;
SCTP_STAT_INCR(sctps_sendecne);
chk->rec.chunk_id.id = SCTP_ECN_ECHO;
chk->rec.chunk_id.can_take_data = 0;
chk->asoc = &stcb->asoc;
chk->send_size = sizeof(struct sctp_ecne_chunk);
chk->data = sctp_get_mbuf_for_msg(chk->send_size, 1, M_DONTWAIT, 1, MT_HEADER);
if (chk->data == NULL) {
sctp_free_a_chunk(stcb, chk);
return;
}
chk->data->m_data += SCTP_MIN_OVERHEAD;
chk->data->m_pkthdr.len = chk->data->m_len = chk->send_size;
chk->sent = SCTP_DATAGRAM_UNSENT;
chk->snd_count = 0;
chk->whoTo = net;
atomic_add_int(&chk->whoTo->ref_count, 1);
stcb->asoc.ecn_echo_cnt_onq++;
ecne = mtod(chk->data, struct sctp_ecne_chunk *);
ecne->ch.chunk_type = SCTP_ECN_ECHO;
ecne->ch.chunk_flags = 0;
ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
ecne->tsn = htonl(high_tsn);
TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
asoc->ctrl_queue_cnt++;
}
void
sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
struct mbuf *m, int iphlen, int bad_crc)
{
struct sctp_association *asoc;
struct sctp_pktdrop_chunk *drp;
struct sctp_tmit_chunk *chk;
uint8_t *datap;
int len;
unsigned int small_one;
struct ip *iph;
long spc;
asoc = &stcb->asoc;
SCTP_TCB_LOCK_ASSERT(stcb);
if (asoc->peer_supports_pktdrop == 0) {
/*
* peer must declare support before I send one.
*/
return;
}
if (stcb->sctp_socket == NULL) {
return;
}
sctp_alloc_a_chunk(stcb, chk);
if (chk == NULL) {
return;
}
chk->copy_by_ref = 0;
iph = mtod(m, struct ip *);
if (iph == NULL) {
return;
}
if (iph->ip_v == IPVERSION) {
/* IPv4 */
len = chk->send_size = iph->ip_len;
} else {
struct ip6_hdr *ip6h;
/* IPv6 */
ip6h = mtod(m, struct ip6_hdr *);
len = chk->send_size = htons(ip6h->ip6_plen);
}
if ((len + iphlen) > m->m_pkthdr.len) {
/* huh */
chk->send_size = len = m->m_pkthdr.len - iphlen;
}
chk->asoc = &stcb->asoc;
chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
if (chk->data == NULL) {
jump_out:
sctp_free_a_chunk(stcb, chk);
return;
}
chk->data->m_data += SCTP_MIN_OVERHEAD;
drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
if (drp == NULL) {
sctp_m_freem(chk->data);
chk->data = NULL;
goto jump_out;
}
small_one = asoc->smallest_mtu;
if (small_one > MCLBYTES) {
/* Only one cluster worth of data MAX */
small_one = MCLBYTES;
}
chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
if (chk->book_size > small_one) {
drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
drp->trunc_len = htons(chk->send_size);
chk->send_size = small_one - (SCTP_MED_OVERHEAD +
sizeof(struct sctp_pktdrop_chunk) +
sizeof(struct sctphdr));
len = chk->send_size;
} else {
/* no truncation needed */
drp->ch.chunk_flags = 0;
drp->trunc_len = htons(0);
}
if (bad_crc) {
drp->ch.chunk_flags |= SCTP_BADCRC;
}
chk->send_size += sizeof(struct sctp_pktdrop_chunk);
chk->data->m_pkthdr.len = chk->data->m_len = chk->send_size;
chk->sent = SCTP_DATAGRAM_UNSENT;
chk->snd_count = 0;
if (net) {
/* we should hit here */
chk->whoTo = net;
} else {
chk->whoTo = asoc->primary_destination;
}
atomic_add_int(&chk->whoTo->ref_count, 1);
chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
chk->rec.chunk_id.can_take_data = 1;
drp->ch.chunk_type = SCTP_PACKET_DROPPED;
drp->ch.chunk_length = htons(chk->send_size);
spc = stcb->sctp_socket->so_rcv.sb_hiwat;
if (spc < 0) {
spc = 0;
}
drp->bottle_bw = htonl(spc);
if (asoc->my_rwnd) {
drp->current_onq = htonl(asoc->size_on_reasm_queue +
asoc->size_on_all_streams +
asoc->my_rwnd_control_len +
stcb->sctp_socket->so_rcv.sb_cc);
} else {
/*
* If my rwnd is 0, possibly from mbuf depletion as well as
* space used, tell the peer there is NO space aka onq == bw
*/
drp->current_onq = htonl(spc);
}
drp->reserved = 0;
datap = drp->data;
m_copydata(m, iphlen, len, (caddr_t)datap);
TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
asoc->ctrl_queue_cnt++;
}
void
sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn)
{
struct sctp_association *asoc;
struct sctp_cwr_chunk *cwr;
struct sctp_tmit_chunk *chk;
asoc = &stcb->asoc;
SCTP_TCB_LOCK_ASSERT(stcb);
TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
if (chk->rec.chunk_id.id == SCTP_ECN_CWR) {
/* found a previous ECN_CWR update it if needed */
cwr = mtod(chk->data, struct sctp_cwr_chunk *);
if (compare_with_wrap(high_tsn, ntohl(cwr->tsn),
MAX_TSN)) {
cwr->tsn = htonl(high_tsn);
}
return;
}
}
/* nope could not find one to update so we must build one */
sctp_alloc_a_chunk(stcb, chk);
if (chk == NULL) {
return;
}
chk->copy_by_ref = 0;
chk->rec.chunk_id.id = SCTP_ECN_CWR;
chk->rec.chunk_id.can_take_data = 1;
chk->asoc = &stcb->asoc;
chk->send_size = sizeof(struct sctp_cwr_chunk);
chk->data = sctp_get_mbuf_for_msg(chk->send_size, 1, M_DONTWAIT, 1, MT_HEADER);
if (chk->data == NULL) {
sctp_free_a_chunk(stcb, chk);
return;
}
chk->data->m_data += SCTP_MIN_OVERHEAD;
chk->data->m_pkthdr.len = chk->data->m_len = chk->send_size;
chk->sent = SCTP_DATAGRAM_UNSENT;
chk->snd_count = 0;
chk->whoTo = net;
atomic_add_int(&chk->whoTo->ref_count, 1);
cwr = mtod(chk->data, struct sctp_cwr_chunk *);
cwr->ch.chunk_type = SCTP_ECN_CWR;
cwr->ch.chunk_flags = 0;
cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
cwr->tsn = htonl(high_tsn);
TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
asoc->ctrl_queue_cnt++;
}
void
sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
int number_entries, uint16_t * list,
uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
{
int len, old_len, i;
struct sctp_stream_reset_out_request *req_out;
struct sctp_chunkhdr *ch;
ch = mtod(chk->data, struct sctp_chunkhdr *);
old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
/* get to new offset for the param. */
req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
/* now how long will this param be? */
len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
req_out->ph.param_length = htons(len);
req_out->request_seq = htonl(seq);
req_out->response_seq = htonl(resp_seq);
req_out->send_reset_at_tsn = htonl(last_sent);
if (number_entries) {
for (i = 0; i < number_entries; i++) {
req_out->list_of_streams[i] = htons(list[i]);
}
}
if (SCTP_SIZE32(len) > len) {
/*
* Need to worry about the pad we may end up adding to the
* end. This is easy since the struct is either aligned to 4
* bytes or 2 bytes off.
*/
req_out->list_of_streams[number_entries] = 0;
}
/* now fix the chunk length */
ch->chunk_length = htons(len + old_len);
chk->send_size = len + old_len;
chk->book_size = SCTP_SIZE32(chk->send_size);
chk->data->m_pkthdr.len = chk->data->m_len = SCTP_SIZE32(chk->send_size);
return;
}
void
sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
int number_entries, uint16_t * list,
uint32_t seq)
{
int len, old_len, i;
struct sctp_stream_reset_in_request *req_in;
struct sctp_chunkhdr *ch;
ch = mtod(chk->data, struct sctp_chunkhdr *);
old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
/* get to new offset for the param. */
req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
/* now how long will this param be? */
len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
req_in->ph.param_length = htons(len);
req_in->request_seq = htonl(seq);
if (number_entries) {
for (i = 0; i < number_entries; i++) {
req_in->list_of_streams[i] = htons(list[i]);
}
}
if (SCTP_SIZE32(len) > len) {
/*
* Need to worry about the pad we may end up adding to the
* end. This is easy since the struct is either aligned to 4
* bytes or 2 bytes off.
*/
req_in->list_of_streams[number_entries] = 0;
}
/* now fix the chunk length */
ch->chunk_length = htons(len + old_len);
chk->send_size = len + old_len;
chk->book_size = SCTP_SIZE32(chk->send_size);
chk->data->m_pkthdr.len = chk->data->m_len = SCTP_SIZE32(chk->send_size);
return;
}
void
sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
uint32_t seq)
{
int len, old_len;
struct sctp_stream_reset_tsn_request *req_tsn;
struct sctp_chunkhdr *ch;
ch = mtod(chk->data, struct sctp_chunkhdr *);
old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
/* get to new offset for the param. */
req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
/* now how long will this param be? */
len = sizeof(struct sctp_stream_reset_tsn_request);
req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
req_tsn->ph.param_length = htons(len);
req_tsn->request_seq = htonl(seq);
/* now fix the chunk length */
ch->chunk_length = htons(len + old_len);
chk->send_size = len + old_len;
chk->book_size = SCTP_SIZE32(chk->send_size);
chk->data->m_pkthdr.len = chk->data->m_len = SCTP_SIZE32(chk->send_size);
return;
}
void
sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
uint32_t resp_seq, uint32_t result)
{
int len, old_len;
struct sctp_stream_reset_response *resp;
struct sctp_chunkhdr *ch;
ch = mtod(chk->data, struct sctp_chunkhdr *);
old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
/* get to new offset for the param. */
resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
/* now how long will this param be? */
len = sizeof(struct sctp_stream_reset_response);
resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
resp->ph.param_length = htons(len);
resp->response_seq = htonl(resp_seq);
resp->result = ntohl(result);
/* now fix the chunk length */
ch->chunk_length = htons(len + old_len);
chk->send_size = len + old_len;
chk->book_size = SCTP_SIZE32(chk->send_size);
chk->data->m_pkthdr.len = chk->data->m_len = SCTP_SIZE32(chk->send_size);
return;
}
void
sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
uint32_t resp_seq, uint32_t result,
uint32_t send_una, uint32_t recv_next)
{
int len, old_len;
struct sctp_stream_reset_response_tsn *resp;
struct sctp_chunkhdr *ch;
ch = mtod(chk->data, struct sctp_chunkhdr *);
old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
/* get to new offset for the param. */
resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
/* now how long will this param be? */
len = sizeof(struct sctp_stream_reset_response_tsn);
resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
resp->ph.param_length = htons(len);
resp->response_seq = htonl(resp_seq);
resp->result = htonl(result);
resp->senders_next_tsn = htonl(send_una);
resp->receivers_next_tsn = htonl(recv_next);
/* now fix the chunk length */
ch->chunk_length = htons(len + old_len);
chk->send_size = len + old_len;
chk->book_size = SCTP_SIZE32(chk->send_size);
chk->data->m_pkthdr.len = chk->data->m_len = SCTP_SIZE32(chk->send_size);
return;
}
int
sctp_send_str_reset_req(struct sctp_tcb *stcb,
int number_entries, uint16_t * list,
uint8_t send_out_req, uint32_t resp_seq,
uint8_t send_in_req,
uint8_t send_tsn_req)
{
struct sctp_association *asoc;
struct sctp_tmit_chunk *chk;
struct sctp_chunkhdr *ch;
uint32_t seq;
asoc = &stcb->asoc;
if (asoc->stream_reset_outstanding) {
/*
* Already one pending, must get ACK back to clear the flag.
*/
return (EBUSY);
}
if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0)) {
/* nothing to do */
return (EINVAL);
}
if (send_tsn_req && (send_out_req || send_in_req)) {
/* error, can't do that */
return (EINVAL);
}
sctp_alloc_a_chunk(stcb, chk);
if (chk == NULL) {
return (ENOMEM);
}
chk->copy_by_ref = 0;
chk->rec.chunk_id.id = SCTP_STREAM_RESET;
chk->rec.chunk_id.can_take_data = 0;
chk->asoc = &stcb->asoc;
chk->book_size = SCTP_SIZE32(chk->send_size = sizeof(struct sctp_chunkhdr));
chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
if (chk->data == NULL) {
sctp_free_a_chunk(stcb, chk);
return (ENOMEM);
}
chk->data->m_data += SCTP_MIN_OVERHEAD;
/* setup chunk parameters */
chk->sent = SCTP_DATAGRAM_UNSENT;
chk->snd_count = 0;
chk->whoTo = asoc->primary_destination;
atomic_add_int(&chk->whoTo->ref_count, 1);
ch = mtod(chk->data, struct sctp_chunkhdr *);
ch->chunk_type = SCTP_STREAM_RESET;
ch->chunk_flags = 0;
ch->chunk_length = htons(chk->send_size);
chk->data->m_pkthdr.len = chk->data->m_len = SCTP_SIZE32(chk->send_size);
seq = stcb->asoc.str_reset_seq_out;
if (send_out_req) {
sctp_add_stream_reset_out(chk, number_entries, list,
seq, resp_seq, (stcb->asoc.sending_seq - 1));
asoc->stream_reset_out_is_outstanding = 1;
seq++;
asoc->stream_reset_outstanding++;
}
if (send_in_req) {
sctp_add_stream_reset_in(chk, number_entries, list, seq);
asoc->stream_reset_outstanding++;
}
if (send_tsn_req) {
sctp_add_stream_reset_tsn(chk, seq);
asoc->stream_reset_outstanding++;
}
asoc->str_reset = chk;
/* insert the chunk for sending */
TAILQ_INSERT_TAIL(&asoc->control_send_queue,
chk,
sctp_next);
asoc->ctrl_queue_cnt++;
sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
return (0);
}
void
sctp_send_abort(struct mbuf *m, int iphlen, struct sctphdr *sh, uint32_t vtag,
struct mbuf *err_cause)
{
/*
* Formulate the abort message, and send it back down.
*/
struct mbuf *mout;
struct sctp_abort_msg *abm;
struct ip *iph, *iph_out;
struct ip6_hdr *ip6, *ip6_out;
int iphlen_out;
/* don't respond to ABORT with ABORT */
if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
if (err_cause)
sctp_m_freem(err_cause);
return;
}
mout = sctp_get_mbuf_for_msg((sizeof(struct ip6_hdr) + sizeof(struct sctp_abort_msg)),
1, M_DONTWAIT, 1, MT_HEADER);
if (mout == NULL) {
if (err_cause)
sctp_m_freem(err_cause);
return;
}
iph = mtod(m, struct ip *);
iph_out = NULL;
ip6_out = NULL;
if (iph->ip_v == IPVERSION) {
iph_out = mtod(mout, struct ip *);
mout->m_len = sizeof(*iph_out) + sizeof(*abm);
mout->m_next = err_cause;
/* Fill in the IP header for the ABORT */
iph_out->ip_v = IPVERSION;
iph_out->ip_hl = (sizeof(struct ip) / 4);
iph_out->ip_tos = (u_char)0;
iph_out->ip_id = 0;
iph_out->ip_off = 0;
iph_out->ip_ttl = MAXTTL;
iph_out->ip_p = IPPROTO_SCTP;
iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
/* let IP layer calculate this */
iph_out->ip_sum = 0;
iphlen_out = sizeof(*iph_out);
abm = (struct sctp_abort_msg *)((caddr_t)iph_out + iphlen_out);
} else if (iph->ip_v == (IPV6_VERSION >> 4)) {
ip6 = (struct ip6_hdr *)iph;
ip6_out = mtod(mout, struct ip6_hdr *);
mout->m_len = sizeof(*ip6_out) + sizeof(*abm);
mout->m_next = err_cause;
/* Fill in the IP6 header for the ABORT */
ip6_out->ip6_flow = ip6->ip6_flow;
ip6_out->ip6_hlim = ip6_defhlim;
ip6_out->ip6_nxt = IPPROTO_SCTP;
ip6_out->ip6_src = ip6->ip6_dst;
ip6_out->ip6_dst = ip6->ip6_src;
iphlen_out = sizeof(*ip6_out);
abm = (struct sctp_abort_msg *)((caddr_t)ip6_out + iphlen_out);
} else {
/* Currently not supported */
return;
}
abm->sh.src_port = sh->dest_port;
abm->sh.dest_port = sh->src_port;
abm->sh.checksum = 0;
if (vtag == 0) {
abm->sh.v_tag = sh->v_tag;
abm->msg.ch.chunk_flags = SCTP_HAD_NO_TCB;
} else {
abm->sh.v_tag = htonl(vtag);
abm->msg.ch.chunk_flags = 0;
}
abm->msg.ch.chunk_type = SCTP_ABORT_ASSOCIATION;
if (err_cause) {
struct mbuf *m_tmp = err_cause;
int err_len = 0;
/* get length of the err_cause chain */
while (m_tmp != NULL) {
err_len += m_tmp->m_len;
m_tmp = m_tmp->m_next;
}
mout->m_pkthdr.len = mout->m_len + err_len;
if (err_len % 4) {
/* need pad at end of chunk */
uint32_t cpthis = 0;
int padlen;
padlen = 4 - (mout->m_pkthdr.len % 4);
m_copyback(mout, mout->m_pkthdr.len, padlen, (caddr_t)&cpthis);
}
abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch) + err_len);
} else {
mout->m_pkthdr.len = mout->m_len;
abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch));
}
/* add checksum */
if ((sctp_no_csum_on_loopback) &&
(m->m_pkthdr.rcvif) &&
(m->m_pkthdr.rcvif->if_type == IFT_LOOP)) {
abm->sh.checksum = 0;
} else {
abm->sh.checksum = sctp_calculate_sum(mout, NULL, iphlen_out);
}
/* zap the rcvif, it should be null */
mout->m_pkthdr.rcvif = 0;
if (iph_out != NULL) {
struct route ro;
/* zap the stack pointer to the route */
bzero(&ro, sizeof ro);
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_OUTPUT2) {
printf("sctp_send_abort calling ip_output:\n");
sctp_print_address_pkt(iph_out, &abm->sh);
}
#endif
/* set IPv4 length */
iph_out->ip_len = mout->m_pkthdr.len;
/* out it goes */
(void)ip_output(mout, 0, &ro, IP_RAWOUTPUT, NULL
,NULL
);
/* Free the route if we got one back */
if (ro.ro_rt)
RTFREE(ro.ro_rt);
} else if (ip6_out != NULL) {
struct route_in6 ro;
/* zap the stack pointer to the route */
bzero(&ro, sizeof(ro));
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_OUTPUT2) {
printf("sctp_send_abort calling ip6_output:\n");
sctp_print_address_pkt((struct ip *)ip6_out, &abm->sh);
}
#endif
ip6_output(mout, NULL, &ro, 0, NULL, NULL
,NULL
);
/* Free the route if we got one back */
if (ro.ro_rt)
RTFREE(ro.ro_rt);
}
SCTP_STAT_INCR(sctps_sendpackets);
SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
}
void
sctp_send_operr_to(struct mbuf *m, int iphlen,
struct mbuf *scm,
uint32_t vtag)
{
struct sctphdr *ihdr;
int retcode;
struct sctphdr *ohdr;
struct sctp_chunkhdr *ophdr;
struct ip *iph;
#ifdef SCTP_DEBUG
struct sockaddr_in6 lsa6, fsa6;
#endif
uint32_t val;
iph = mtod(m, struct ip *);
ihdr = (struct sctphdr *)((caddr_t)iph + iphlen);
if (!(scm->m_flags & M_PKTHDR)) {
/* must be a pkthdr */
printf("Huh, not a packet header in send_operr\n");
sctp_m_freem(scm);
return;
}
M_PREPEND(scm, (sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr)), M_DONTWAIT);
if (scm == NULL) {
/* can't send because we can't add a mbuf */
return;
}
ohdr = mtod(scm, struct sctphdr *);
ohdr->src_port = ihdr->dest_port;
ohdr->dest_port = ihdr->src_port;
ohdr->v_tag = vtag;
ohdr->checksum = 0;
ophdr = (struct sctp_chunkhdr *)(ohdr + 1);
ophdr->chunk_type = SCTP_OPERATION_ERROR;
ophdr->chunk_flags = 0;
ophdr->chunk_length = htons(scm->m_pkthdr.len - sizeof(struct sctphdr));
if (scm->m_pkthdr.len % 4) {
/* need padding */
uint32_t cpthis = 0;
int padlen;
padlen = 4 - (scm->m_pkthdr.len % 4);
m_copyback(scm, scm->m_pkthdr.len, padlen, (caddr_t)&cpthis);
}
if ((sctp_no_csum_on_loopback) &&
(m->m_pkthdr.rcvif) &&
(m->m_pkthdr.rcvif->if_type == IFT_LOOP)) {
val = 0;
} else {
val = sctp_calculate_sum(scm, NULL, 0);
}
ohdr->checksum = val;
if (iph->ip_v == IPVERSION) {
/* V4 */
struct ip *out;
struct route ro;
M_PREPEND(scm, sizeof(struct ip), M_DONTWAIT);
if (scm == NULL)
return;
bzero(&ro, sizeof ro);
out = mtod(scm, struct ip *);
out->ip_v = iph->ip_v;
out->ip_hl = (sizeof(struct ip) / 4);
out->ip_tos = iph->ip_tos;
out->ip_id = iph->ip_id;
out->ip_off = 0;
out->ip_ttl = MAXTTL;
out->ip_p = IPPROTO_SCTP;
out->ip_sum = 0;
out->ip_src = iph->ip_dst;
out->ip_dst = iph->ip_src;
out->ip_len = scm->m_pkthdr.len;
retcode = ip_output(scm, 0, &ro, IP_RAWOUTPUT, NULL
,NULL
);
SCTP_STAT_INCR(sctps_sendpackets);
SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
/* Free the route if we got one back */
if (ro.ro_rt)
RTFREE(ro.ro_rt);
} else {
/* V6 */
struct route_in6 ro;
struct ip6_hdr *out6, *in6;
M_PREPEND(scm, sizeof(struct ip6_hdr), M_DONTWAIT);
if (scm == NULL)
return;
bzero(&ro, sizeof ro);
in6 = mtod(m, struct ip6_hdr *);
out6 = mtod(scm, struct ip6_hdr *);
out6->ip6_flow = in6->ip6_flow;
out6->ip6_hlim = ip6_defhlim;
out6->ip6_nxt = IPPROTO_SCTP;
out6->ip6_src = in6->ip6_dst;
out6->ip6_dst = in6->ip6_src;
#ifdef SCTP_DEBUG
bzero(&lsa6, sizeof(lsa6));
lsa6.sin6_len = sizeof(lsa6);
lsa6.sin6_family = AF_INET6;
lsa6.sin6_addr = out6->ip6_src;
bzero(&fsa6, sizeof(fsa6));
fsa6.sin6_len = sizeof(fsa6);
fsa6.sin6_family = AF_INET6;
fsa6.sin6_addr = out6->ip6_dst;
if (sctp_debug_on & SCTP_DEBUG_OUTPUT2) {
printf("sctp_operr_to calling ipv6 output:\n");
printf("src: ");
sctp_print_address((struct sockaddr *)&lsa6);
printf("dst ");
sctp_print_address((struct sockaddr *)&fsa6);
}
#endif /* SCTP_DEBUG */
ip6_output(scm, NULL, &ro, 0, NULL, NULL
,NULL
);
SCTP_STAT_INCR(sctps_sendpackets);
SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
/* Free the route if we got one back */
if (ro.ro_rt)
RTFREE(ro.ro_rt);
}
}
static struct mbuf *
sctp_copy_resume(struct sctp_stream_queue_pending *sp,
struct uio *uio,
struct sctp_sndrcvinfo *srcv,
int max_send_len,
int user_marks_eor,
int *error,
uint32_t * sndout,
struct mbuf **new_tail)
{
int left, cancpy, willcpy, need_hdr = 0;
struct mbuf *m, *prev, *head;
left = min(uio->uio_resid, max_send_len);
/* Always get a header just in case */
need_hdr = 1;
head = sctp_get_mbuf_for_msg(left, need_hdr, M_WAIT, 0, MT_DATA);
cancpy = M_TRAILINGSPACE(head);
willcpy = min(cancpy, left);
*error = uiomove(mtod(head, caddr_t), willcpy, uio);
if (*error) {
sctp_m_freem(head);
return (NULL);
}
*sndout += willcpy;
left -= willcpy;
head->m_len = willcpy;
m = head;
*new_tail = head;
while (left > 0) {
/* move in user data */
m->m_next = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 0, MT_DATA);
if (m->m_next == NULL) {
sctp_m_freem(head);
*new_tail = NULL;
*error = ENOMEM;
return (NULL);
}
prev = m;
m = m->m_next;
cancpy = M_TRAILINGSPACE(m);
willcpy = min(cancpy, left);
*error = uiomove(mtod(m, caddr_t), willcpy, uio);
if (*error) {
sctp_m_freem(head);
*new_tail = NULL;
*error = EFAULT;
return (NULL);
}
m->m_len = willcpy;
left -= willcpy;
*sndout += willcpy;
*new_tail = m;
if (left == 0) {
m->m_next = NULL;
}
}
return (head);
}
static int
sctp_copy_one(struct sctp_stream_queue_pending *sp,
struct uio *uio,
int resv_upfront)
{
int left, cancpy, willcpy, error;
struct mbuf *m, *head;
int cpsz = 0;
/* First one gets a header */
left = sp->length;
head = m = sctp_get_mbuf_for_msg((left + resv_upfront), 1, M_WAIT, 0, MT_DATA);
if (m == NULL) {
return (ENOMEM);
}
/*
* Add this one for m in now, that way if the alloc fails we won't
* have a bad cnt.
*/
m->m_data += resv_upfront;
cancpy = M_TRAILINGSPACE(m);
willcpy = min(cancpy, left);
while (left > 0) {
/* move in user data */
error = uiomove(mtod(m, caddr_t), willcpy, uio);
if (error) {
sctp_m_freem(head);
return (error);
}
m->m_len = willcpy;
left -= willcpy;
cpsz += willcpy;
if (left > 0) {
m->m_next = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 0, MT_DATA);
if (m->m_next == NULL) {
/*
* the head goes back to caller, he can free
* the rest
*/
sctp_m_freem(head);
return (ENOMEM);
}
m = m->m_next;
cancpy = M_TRAILINGSPACE(m);
willcpy = min(cancpy, left);
} else {
sp->tail_mbuf = m;
m->m_next = NULL;
}
}
sp->data = head;
sp->length = cpsz;
return (0);
}
static struct sctp_stream_queue_pending *
sctp_copy_it_in(struct sctp_tcb *stcb,
struct sctp_association *asoc,
struct sctp_sndrcvinfo *srcv,
struct uio *uio,
struct sctp_nets *net,
int max_send_len,
int user_marks_eor,
int *errno,
int non_blocking)
{
/*
* This routine must be very careful in its work. Protocol
* processing is up and running so care must be taken to spl...()
* when you need to do something that may effect the stcb/asoc. The
* sb is locked however. When data is copied the protocol processing
* should be enabled since this is a slower operation...
*/
struct sctp_stream_queue_pending *sp = NULL;
int resv_in_first;
*errno = 0;
/*
* Unless E_EOR mode is on, we must make a send FIT in one call.
*/
if (((user_marks_eor == 0) && non_blocking) &&
(uio->uio_resid > stcb->sctp_socket->so_snd.sb_hiwat)) {
/* It will NEVER fit */
*errno = EMSGSIZE;
goto out_now;
}
/* Now can we send this? */
if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
(SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
(SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
(asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
/* got data while shutting down */
*errno = ECONNRESET;
goto out_now;
}
sp = (struct sctp_stream_queue_pending *)SCTP_ZONE_GET(sctppcbinfo.ipi_zone_strmoq);
if (sp == NULL) {
*errno = ENOMEM;
goto out_now;
}
SCTP_INCR_STRMOQ_COUNT();
sp->act_flags = 0;
sp->sinfo_flags = srcv->sinfo_flags;
sp->timetolive = srcv->sinfo_timetolive;
sp->ppid = srcv->sinfo_ppid;
sp->context = srcv->sinfo_context;
sp->strseq = 0;
SCTP_GETTIME_TIMEVAL(&sp->ts);
sp->stream = srcv->sinfo_stream;
sp->length = min(uio->uio_resid, max_send_len);
if ((sp->length == uio->uio_resid) &&
((user_marks_eor == 0) ||
(srcv->sinfo_flags & SCTP_EOF) ||
(user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))
) {
sp->msg_is_complete = 1;
} else {
sp->msg_is_complete = 0;
}
sp->some_taken = 0;
resv_in_first = sizeof(struct sctp_data_chunk);
sp->data = sp->tail_mbuf = NULL;
*errno = sctp_copy_one(sp, uio, resv_in_first);
if (*errno) {
sctp_free_a_strmoq(stcb, sp);
sp->data = NULL;
sp->net = NULL;
sp = NULL;
} else {
if (sp->sinfo_flags & SCTP_ADDR_OVER) {
sp->net = net;
sp->addr_over = 1;
} else {
sp->net = asoc->primary_destination;
sp->addr_over = 0;
}
atomic_add_int(&sp->net->ref_count, 1);
sp->data->m_pkthdr.len = sp->length;
sctp_set_prsctp_policy(stcb, sp);
}
out_now:
return (sp);
}
int
sctp_sosend(struct socket *so,
struct sockaddr *addr,
struct uio *uio,
struct mbuf *top,
struct mbuf *control,
int flags
,
struct thread *p
)
{
struct sctp_inpcb *inp;
int s, error, use_rcvinfo = 0;
struct sctp_sndrcvinfo srcv;
inp = (struct sctp_inpcb *)so->so_pcb;
s = splnet();
if (control) {
/* process cmsg snd/rcv info (maybe a assoc-id) */
if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&srcv, control,
sizeof(srcv))) {
/* got one */
use_rcvinfo = 1;
}
}
error = sctp_lower_sosend(so, addr, uio, top, control, flags,
use_rcvinfo, &srcv, p);
splx(s);
return (error);
}
extern unsigned int sctp_add_more_threshold;
int
sctp_lower_sosend(struct socket *so,
struct sockaddr *addr,
struct uio *uio,
struct mbuf *top,
struct mbuf *control,
int flags,
int use_rcvinfo,
struct sctp_sndrcvinfo *srcv,
struct thread *p
)
{
unsigned int sndlen, max_len;
int error, len;
int s, queue_only = 0, queue_only_for_init = 0;
int free_cnt_applied = 0;
int un_sent = 0;
int now_filled = 0;
struct sctp_block_entry be;
struct sctp_inpcb *inp;
struct sctp_tcb *stcb = NULL;
struct timeval now;
struct sctp_nets *net;
struct sctp_association *asoc;
struct sctp_inpcb *t_inp;
int create_lock_applied = 0;
int nagle_applies = 0;
int some_on_control = 0;
int got_all_of_the_send = 0;
int hold_tcblock = 0;
int non_blocking = 0;
error = 0;
net = NULL;
stcb = NULL;
asoc = NULL;
t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
if (inp == NULL) {
error = EFAULT;
splx(s);
goto out_unlocked;
}
atomic_add_int(&inp->total_sends, 1);
if (uio)
sndlen = uio->uio_resid;
else
sndlen = top->m_pkthdr.len;
s = splnet();
hold_tcblock = 0;
if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
(inp->sctp_socket->so_qlimit)) {
/* The listener can NOT send */
error = EFAULT;
splx(s);
goto out_unlocked;
}
if ((use_rcvinfo) && srcv) {
if (srcv->sinfo_flags)
SCTP_STAT_INCR(sctps_sends_with_flags);
if (srcv->sinfo_flags & SCTP_SENDALL) {
/* its a sendall */
error = sctp_sendall(inp, uio, top, srcv);
top = NULL;
splx(s);
goto out_unlocked;
}
}
/* now we must find the assoc */
if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
SCTP_INP_RLOCK(inp);
stcb = LIST_FIRST(&inp->sctp_asoc_list);
if (stcb == NULL) {
SCTP_INP_RUNLOCK(inp);
error = ENOTCONN;
splx(s);
goto out_unlocked;
}
hold_tcblock = 0;
SCTP_INP_RUNLOCK(inp);
if (addr)
/* Must locate the net structure if addr given */
net = sctp_findnet(stcb, addr);
else
net = stcb->asoc.primary_destination;
} else if (use_rcvinfo && srcv && srcv->sinfo_assoc_id) {
stcb = sctp_findassociation_ep_asocid(inp, srcv->sinfo_assoc_id, 0);
if (stcb) {
if (addr)
/*
* Must locate the net structure if addr
* given
*/
net = sctp_findnet(stcb, addr);
else
net = stcb->asoc.primary_destination;
}
hold_tcblock = 0;
} else if (addr) {
/*
* Since we did not use findep we must increment it, and if
* we don't find a tcb decrement it.
*/
SCTP_INP_WLOCK(inp);
SCTP_INP_INCR_REF(inp);
SCTP_INP_WUNLOCK(inp);
stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
if (stcb == NULL) {
SCTP_INP_WLOCK(inp);
SCTP_INP_DECR_REF(inp);
SCTP_INP_WUNLOCK(inp);
} else {
hold_tcblock = 1;
}
}
if ((stcb == NULL) && (addr)) {
/* Possible implicit send? */
SCTP_ASOC_CREATE_LOCK(inp);
create_lock_applied = 1;
if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
(inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
/* Should I really unlock ? */
error = EFAULT;
splx(s);
goto out_unlocked;
}
if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
(addr->sa_family == AF_INET6)) {
error = EINVAL;
splx(s);
goto out_unlocked;
}
SCTP_INP_WLOCK(inp);
SCTP_INP_INCR_REF(inp);
SCTP_INP_WUNLOCK(inp);
/* With the lock applied look again */
stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
if (stcb == NULL) {
SCTP_INP_WLOCK(inp);
SCTP_INP_DECR_REF(inp);
SCTP_INP_WUNLOCK(inp);
} else {
hold_tcblock = 1;
}
}
if (stcb == NULL) {
if (inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
error = ENOTCONN;
splx(s);
goto out_unlocked;
} else if (addr == NULL) {
error = ENOENT;
splx(s);
goto out_unlocked;
} else {
/*
* UDP style, we must go ahead and start the INIT
* process
*/
if ((use_rcvinfo) && (srcv) &&
(srcv->sinfo_flags & SCTP_ABORT)) {
/* User asks to abort a non-existant asoc */
error = ENOENT;
splx(s);
goto out_unlocked;
}
/* get an asoc/stcb struct */
stcb = sctp_aloc_assoc(inp, addr, 1, &error, 0);
if (stcb == NULL) {
/* Error is setup for us in the call */
splx(s);
goto out_unlocked;
}
if (create_lock_applied) {
SCTP_ASOC_CREATE_UNLOCK(inp);
create_lock_applied = 0;
} else {
printf("Huh-3? create lock should have been on??\n");
}
/*
* Turn on queue only flag to prevent data from
* being sent
*/
queue_only = 1;
asoc = &stcb->asoc;
asoc->state = SCTP_STATE_COOKIE_WAIT;
SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
/* initialize authentication params for the assoc */
sctp_initialize_auth_params(inp, stcb);
if (control) {
/*
* see if a init structure exists in cmsg
* headers
*/
struct sctp_initmsg initm;
int i;
if (sctp_find_cmsg(SCTP_INIT, (void *)&initm, control,
sizeof(initm))) {
/*
* we have an INIT override of the
* default
*/
if (initm.sinit_max_attempts)
asoc->max_init_times = initm.sinit_max_attempts;
if (initm.sinit_num_ostreams)
asoc->pre_open_streams = initm.sinit_num_ostreams;
if (initm.sinit_max_instreams)
asoc->max_inbound_streams = initm.sinit_max_instreams;
if (initm.sinit_max_init_timeo)
asoc->initial_init_rto_max = initm.sinit_max_init_timeo;
if (asoc->streamoutcnt < asoc->pre_open_streams) {
/* Default is NOT correct */
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_OUTPUT1) {
printf("Ok, defout:%d pre_open:%d\n",
asoc->streamoutcnt, asoc->pre_open_streams);
}
#endif
SCTP_FREE(asoc->strmout);
asoc->strmout = NULL;
asoc->streamoutcnt = asoc->pre_open_streams;
/*
* What happens if this
* fails? .. we panic ...
*/
{
struct sctp_stream_out *tmp_str;
int had_lock = 0;
if (hold_tcblock) {
had_lock = 1;
SCTP_TCB_UNLOCK(stcb);
}
SCTP_MALLOC(tmp_str,
struct sctp_stream_out *,
asoc->streamoutcnt *
sizeof(struct sctp_stream_out),
"StreamsOut");
if (had_lock) {
SCTP_TCB_LOCK(stcb);
}
asoc->strmout = tmp_str;
}
for (i = 0; i < asoc->streamoutcnt; i++) {
/*
* inbound side must
* be set to 0xffff,
* also NOTE when we
* get the INIT-ACK
* back (for INIT
* sender) we MUST
* reduce the count
* (streamoutcnt)
* but first check
* if we sent to any
* of the upper
* streams that were
* dropped (if some
* were). Those that
* were dropped must
* be notified to
* the upper layer
* as failed to
* send.
*/
asoc->strmout[i].next_sequence_sent = 0x0;
TAILQ_INIT(&asoc->strmout[i].outqueue);
asoc->strmout[i].stream_no = i;
asoc->strmout[i].last_msg_incomplete = 0;
asoc->strmout[i].next_spoke.tqe_next = 0;
asoc->strmout[i].next_spoke.tqe_prev = 0;
}
}
}
}
hold_tcblock = 1;
/* out with the INIT */
queue_only_for_init = 1;
/*
* we may want to dig in after this call and adjust
* the MTU value. It defaulted to 1500 (constant)
* but the ro structure may now have an update and
* thus we may need to change it BEFORE we append
* the message.
*/
net = stcb->asoc.primary_destination;
asoc = &stcb->asoc;
}
}
if (((so->so_state & SS_NBIO)
|| (flags & MSG_NBIO)
)) {
non_blocking = 1;
}
asoc = &stcb->asoc;
/* would we block? */
if (non_blocking) {
if ((so->so_snd.sb_hiwat <
(sndlen + stcb->asoc.total_output_queue_size)) ||
(stcb->asoc.chunks_on_out_queue >
sctp_max_chunks_on_queue)) {
error = EWOULDBLOCK;
atomic_add_int(&stcb->sctp_ep->total_nospaces, 1);
splx(s);
goto out_unlocked;
}
}
/* Keep the stcb from being freed under our feet */
atomic_add_int(&stcb->asoc.refcnt, 1);
free_cnt_applied = 1;
if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
error = ECONNRESET;
goto out_unlocked;
}
if (create_lock_applied) {
SCTP_ASOC_CREATE_UNLOCK(inp);
create_lock_applied = 0;
}
if (asoc->stream_reset_outstanding) {
/*
* Can't queue any data while stream reset is underway.
*/
error = EAGAIN;
goto out_unlocked;
}
if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
(SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
queue_only = 1;
}
if ((use_rcvinfo == 0) || (srcv == NULL)) {
/* Grab the default stuff from the asoc */
srcv = &stcb->asoc.def_send;
}
/* we are now done with all control */
if (control) {
sctp_m_freem(control);
control = NULL;
}
if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
(SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
(SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
(asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
if ((use_rcvinfo) &&
(srcv->sinfo_flags & SCTP_ABORT)) {
;
} else {
error = ECONNRESET;
splx(s);
goto out_unlocked;
}
}
/* Ok, we will attempt a msgsnd :> */
if (p) {
p->td_proc->p_stats->p_ru.ru_msgsnd++;
}
if (stcb) {
if (net && ((srcv->sinfo_flags & SCTP_ADDR_OVER))) {
/* we take the override or the unconfirmed */
;
} else {
net = stcb->asoc.primary_destination;
}
}
if ((net->flight_size > net->cwnd) && (sctp_cmt_on_off == 0)) {
/*
* CMT: Added check for CMT above. net above is the primary
* dest. If CMT is ON, sender should always attempt to send
* with the output routine sctp_fill_outqueue() that loops
* through all destination addresses. Therefore, if CMT is
* ON, queue_only is NOT set to 1 here, so that
* sctp_chunk_output() can be called below.
*/
queue_only = 1;
} else if (asoc->ifp_had_enobuf) {
SCTP_STAT_INCR(sctps_ifnomemqueued);
if (net->flight_size > (net->mtu * 2))
queue_only = 1;
asoc->ifp_had_enobuf = 0;
} else {
un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count) * sizeof(struct sctp_data_chunk)));
}
/* Are we aborting? */
if (srcv->sinfo_flags & SCTP_ABORT) {
struct mbuf *mm;
int tot_demand, tot_out, max;
SCTP_STAT_INCR(sctps_sends_with_abort);
if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
(SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
/* It has to be up before we abort */
/* how big is the user initiated abort? */
error = EINVAL;
goto out;
}
if (hold_tcblock) {
SCTP_TCB_UNLOCK(stcb);
hold_tcblock = 0;
}
if (top) {
mm = sctp_get_mbuf_for_msg(1, 1, M_WAIT, 1, MT_DATA);
if (top->m_flags & M_PKTHDR)
tot_out = top->m_pkthdr.len;
else {
struct mbuf *cntm;
tot_out = 0;
cntm = top;
while (cntm) {
tot_out += cntm->m_len;
cntm = cntm->m_next;
}
}
tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
} else {
/* Must fit in a MTU */
tot_out = uio->uio_resid;
tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
mm = sctp_get_mbuf_for_msg(tot_demand, 1, M_WAIT, 1, MT_DATA);
}
if (mm == NULL) {
error = ENOMEM;
goto out;
}
max = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
max -= sizeof(struct sctp_abort_msg);
if (tot_out > max) {
tot_out = max;
}
if (mm) {
struct sctp_paramhdr *ph;
/* now move forward the data pointer */
ph = mtod(mm, struct sctp_paramhdr *);
ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
ph->param_length = htons((sizeof(struct sctp_paramhdr) + tot_out));
ph++;
mm->m_pkthdr.len = tot_out + sizeof(struct sctp_paramhdr);
mm->m_len = mm->m_pkthdr.len;
if (top == NULL) {
error = uiomove((caddr_t)ph, (int)tot_out, uio);
if (error) {
/*
* Here if we can't get his data we
* still abort we just don't get to
* send the users note :-0
*/
sctp_m_freem(mm);
mm = NULL;
}
} else {
mm->m_next = top;
}
}
if (hold_tcblock == 0) {
SCTP_TCB_LOCK(stcb);
hold_tcblock = 1;
}
atomic_add_int(&stcb->asoc.refcnt, -1);
free_cnt_applied = 0;
/* release this lock, otherwise we hang on ourselves */
sctp_abort_an_association(stcb->sctp_ep, stcb,
SCTP_RESPONSE_TO_USER_REQ,
mm);
/* now relock the stcb so everything is sane */
hold_tcblock = 0;
stcb = NULL;
goto out_unlocked;
}
/* Calculate the maximum we can send */
if (so->so_snd.sb_hiwat > stcb->asoc.total_output_queue_size) {
max_len = so->so_snd.sb_hiwat - stcb->asoc.total_output_queue_size;
} else {
max_len = 0;
}
if (hold_tcblock) {
SCTP_TCB_UNLOCK(stcb);
hold_tcblock = 0;
}
splx(s);
/* Is the stream no. valid? */
if (srcv->sinfo_stream >= asoc->streamoutcnt) {
/* Invalid stream number */
error = EINVAL;
goto out_unlocked;
}
if (asoc->strmout == NULL) {
/* huh? software error */
error = EFAULT;
goto out_unlocked;
}
len = 0;
if (max_len < sctp_add_more_threshold) {
/* No room right no ! */
SOCKBUF_LOCK(&so->so_snd);
while (so->so_snd.sb_hiwat < (stcb->asoc.total_output_queue_size + sctp_add_more_threshold)) {
#ifdef SCTP_BLK_LOGGING
sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA,
so, asoc, uio->uio_resid);
#endif
be.error = 0;
stcb->block_entry = &be;
error = sbwait(&so->so_snd);
stcb->block_entry = NULL;
if (error || so->so_error || be.error) {
if (error == 0) {
if (so->so_error)
error = so->so_error;
if (be.error) {
error = be.error;
}
}
SOCKBUF_UNLOCK(&so->so_snd);
goto out_unlocked;
}
#ifdef SCTP_BLK_LOGGING
sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
so, asoc, stcb->asoc.total_output_queue_size);
#endif
if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
goto out_unlocked;
}
}
if (so->so_snd.sb_hiwat > stcb->asoc.total_output_queue_size) {
max_len = so->so_snd.sb_hiwat - stcb->asoc.total_output_queue_size;
} else {
max_len = 0;
}
SOCKBUF_UNLOCK(&so->so_snd);
}
if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
goto out_unlocked;
}
atomic_add_int(&stcb->total_sends, 1);
if (top == NULL) {
struct sctp_stream_queue_pending *sp;
struct sctp_stream_out *strm;
uint32_t sndout, initial_out;
int user_marks_eor;
if (uio->uio_resid == 0) {
if (srcv->sinfo_flags & SCTP_EOF) {
got_all_of_the_send = 1;
goto dataless_eof;
} else {
error = EINVAL;
goto out;
}
}
initial_out = uio->uio_resid;
if ((asoc->stream_locked) &&
(asoc->stream_locked_on != srcv->sinfo_stream)) {
error = EAGAIN;
goto out;
}
strm = &stcb->asoc.strmout[srcv->sinfo_stream];
user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
if (strm->last_msg_incomplete == 0) {
do_a_copy_in:
sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error, non_blocking);
if ((sp == NULL) || (error)) {
goto out;
}
SCTP_TCB_SEND_LOCK(stcb);
if (sp->msg_is_complete) {
strm->last_msg_incomplete = 0;
asoc->stream_locked = 0;
} else {
/*
* Just got locked to this guy in case of an
* interupt.
*/
strm->last_msg_incomplete = 1;
asoc->stream_locked = 1;
asoc->stream_locked_on = srcv->sinfo_stream;
}
sctp_snd_sb_alloc(stcb, sp->length);
asoc->stream_queue_cnt++;
TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
sp->strseq = strm->next_sequence_sent;
#ifdef SCTP_LOG_SENDING_STR
sctp_misc_ints(SCTP_STRMOUT_LOG_ASSIGN,
(uintptr_t) stcb, (uintptr_t) sp,
(uint32_t) ((srcv->sinfo_stream << 16) | sp->strseq), 0);
#endif
strm->next_sequence_sent++;
} else {
SCTP_STAT_INCR(sctps_sends_with_unord);
}
if ((strm->next_spoke.tqe_next == NULL) &&
(strm->next_spoke.tqe_prev == NULL)) {
/* Not on wheel, insert */
sctp_insert_on_wheel(stcb, asoc, strm, 1);
}
SCTP_TCB_SEND_UNLOCK(stcb);
} else {
sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
if (sp == NULL) {
/* ???? Huh ??? last msg is gone */
#ifdef INVARIANTS
panic("Warning: Last msg marked incomplete, yet nothing left?");
#else
printf("Warning: Last msg marked incomplete, yet nothing left?\n");
strm->last_msg_incomplete = 0;
#endif
goto do_a_copy_in;
}
}
while (uio->uio_resid > 0) {
/* How much room do we have? */
struct mbuf *new_tail, *mm;
if (so->so_snd.sb_hiwat > stcb->asoc.total_output_queue_size)
max_len = so->so_snd.sb_hiwat - stcb->asoc.total_output_queue_size;
else
max_len = 0;
if ((max_len > sctp_add_more_threshold) ||
(uio->uio_resid && (uio->uio_resid < max_len))) {
sndout = 0;
new_tail = NULL;
if (hold_tcblock) {
SCTP_TCB_UNLOCK(stcb);
hold_tcblock = 0;
}
mm = sctp_copy_resume(sp, uio, srcv, max_len, user_marks_eor, &error, &sndout, &new_tail);
if ((mm == NULL) || error) {
if (mm) {
sctp_m_freem(mm);
}
goto out;
}
/* Update the mbuf and count */
SCTP_TCB_SEND_LOCK(stcb);
if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
/*
* we need to get out. Peer probably
* aborted.
*/
sctp_m_freem(mm);
if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED)
error = ECONNRESET;
goto out;
}
if (sp->tail_mbuf) {
/* tack it to the end */
sp->tail_mbuf->m_next = mm;
sp->tail_mbuf = new_tail;
} else {
/* A stolen mbuf */
sp->data = mm;
sp->tail_mbuf = new_tail;
}
sctp_snd_sb_alloc(stcb, sndout);
sp->length += sndout;
len += sndout;
/* Did we reach EOR? */
if ((uio->uio_resid == 0) &&
((user_marks_eor == 0) ||
(user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))
) {
sp->msg_is_complete = 1;
} else {
sp->msg_is_complete = 0;
}
if (sp->data->m_flags & M_PKTHDR) {
/* update length */
sp->data->m_pkthdr.len = sp->length;
}
SCTP_TCB_SEND_UNLOCK(stcb);
}
if (uio->uio_resid == 0) {
/* got it all? */
continue;
}
/* PR-SCTP? */
if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
/*
* This is ugly but we must assure locking
* order
*/
if (hold_tcblock == 0) {
SCTP_TCB_LOCK(stcb);
hold_tcblock = 1;
}
sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
if (so->so_snd.sb_hiwat > stcb->asoc.total_output_queue_size)
max_len = so->so_snd.sb_hiwat - stcb->asoc.total_output_queue_size;
else
max_len = 0;
if (max_len > 0) {
continue;
}
SCTP_TCB_UNLOCK(stcb);
hold_tcblock = 0;
}
/* wait for space now */
if (non_blocking) {
/* Non-blocking io in place out */
goto skip_out_eof;
}
if ((net->flight_size > net->cwnd) &&
(sctp_cmt_on_off == 0)) {
queue_only = 1;
} else if (asoc->ifp_had_enobuf) {
SCTP_STAT_INCR(sctps_ifnomemqueued);
if (net->flight_size > (net->mtu * 2)) {
queue_only = 1;
} else {
queue_only = 0;
}
asoc->ifp_had_enobuf = 0;
un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count) *
sizeof(struct sctp_data_chunk)));
} else {
un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count) *
sizeof(struct sctp_data_chunk)));
queue_only = 0;
}
if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
(stcb->asoc.total_flight > 0) &&
(un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
) {
/*
* Ok, Nagle is set on and we have data
* outstanding. Don't send anything and let
* SACKs drive out the data unless wen have
* a "full" segment to send.
*/
#ifdef SCTP_NAGLE_LOGGING
sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
#endif
SCTP_STAT_INCR(sctps_naglequeued);
nagle_applies = 1;
} else {
#ifdef SCTP_NAGLE_LOGGING
if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
#endif
SCTP_STAT_INCR(sctps_naglesent);
nagle_applies = 0;
}
/* What about the INIT, send it maybe */
#ifdef SCTP_BLK_LOGGING
sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only, nagle_applies, un_sent);
sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size, stcb->asoc.total_flight,
stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
#endif
if (queue_only_for_init) {
if (hold_tcblock == 0) {
SCTP_TCB_LOCK(stcb);
hold_tcblock = 1;
}
if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
/* a collision took us forward? */
queue_only_for_init = 0;
queue_only = 0;
} else {
sctp_send_initiate(inp, stcb);
stcb->asoc.state = SCTP_STATE_COOKIE_WAIT;
queue_only_for_init = 0;
queue_only = 1;
}
}
if ((queue_only == 0) && (nagle_applies == 0)
) {
/*
* need to start chunk output before
* blocking.. note that if a lock is already
* applied, then the input via the net is
* happening and I don't need to start
* output :-D
*/
if (hold_tcblock == 0) {
if (SCTP_TCB_TRYLOCK(stcb)) {
hold_tcblock = 1;
sctp_chunk_output(inp,
stcb,
SCTP_OUTPUT_FROM_USR_SEND);
}
} else {
sctp_chunk_output(inp,
stcb,
SCTP_OUTPUT_FROM_USR_SEND);
}
if (hold_tcblock == 1) {
SCTP_TCB_UNLOCK(stcb);
hold_tcblock = 0;
}
}
SOCKBUF_LOCK(&so->so_snd);
/*
* This is a bit strange, but I think it will work.
* The total_output_queue_size is locked and
* protected by the TCB_LOCK, which we just
* released. There is a race that can occur between
* releasing it above, and me getting the socket
* lock, where sacks come in but we have not put the
* SB_WAIT on the so_snd buffer to get the wakeup.
* After the LOCK is applied the sack_processing
* will also need to LOCK the so->so_snd to do the
* actual sowwakeup(). So once we have the socket
* buffer lock if we recheck the size we KNOW we
* will get to sleep safely with the wakeup flag in
* place.
*/
if (so->so_snd.sb_hiwat < (stcb->asoc.total_output_queue_size + sctp_add_more_threshold)) {
#ifdef SCTP_BLK_LOGGING
sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
so, asoc, uio->uio_resid);
#endif
be.error = 0;
stcb->block_entry = &be;
error = sbwait(&so->so_snd);
stcb->block_entry = NULL;
if (error || so->so_error || be.error) {
if (error == 0) {
if (so->so_error)
error = so->so_error;
if (be.error) {
error = be.error;
}
}
SOCKBUF_UNLOCK(&so->so_snd);
goto out_unlocked;
}
#ifdef SCTP_BLK_LOGGING
sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
so, asoc, stcb->asoc.total_output_queue_size);
#endif
}
SOCKBUF_UNLOCK(&so->so_snd);
if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
goto out_unlocked;
}
}
SCTP_TCB_SEND_LOCK(stcb);
if (sp->msg_is_complete == 0) {
strm->last_msg_incomplete = 1;
asoc->stream_locked = 1;
asoc->stream_locked_on = srcv->sinfo_stream;
} else {
strm->last_msg_incomplete = 0;
asoc->stream_locked = 0;
}
SCTP_TCB_SEND_UNLOCK(stcb);
if (uio->uio_resid == 0) {
got_all_of_the_send = 1;
}
} else if (top) {
/* We send in a 0, since we do NOT have any locks */
error = sctp_msg_append(stcb, net, top, srcv, 0);
top = NULL;
}
if (error) {
goto out;
}
dataless_eof:
/* EOF thing ? */
if ((srcv->sinfo_flags & SCTP_EOF) &&
(got_all_of_the_send == 1) &&
(stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)
) {
SCTP_STAT_INCR(sctps_sends_with_eof);
error = 0;
if (hold_tcblock == 0) {
SCTP_TCB_LOCK(stcb);
hold_tcblock = 1;
}
if (TAILQ_EMPTY(&asoc->send_queue) &&
TAILQ_EMPTY(&asoc->sent_queue) &&
(asoc->stream_queue_cnt == 0)) {
if (asoc->locked_on_sending) {
goto abort_anyway;
}
/* there is nothing queued to send, so I'm done... */
if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
(SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
(SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
/* only send SHUTDOWN the first time through */
sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
asoc->state = SCTP_STATE_SHUTDOWN_SENT;
SCTP_STAT_DECR_GAUGE32(sctps_currestab);
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
asoc->primary_destination);
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
asoc->primary_destination);
}
} else {
/*
* we still got (or just got) data to send, so set
* SHUTDOWN_PENDING
*/
/*
* XXX sockets draft says that SCTP_EOF should be
* sent with no data. currently, we will allow user
* data to be sent first and move to
* SHUTDOWN-PENDING
*/
if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
(SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
(SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
if (hold_tcblock == 0) {
SCTP_TCB_LOCK(stcb);
hold_tcblock = 1;
}
if (asoc->locked_on_sending) {
/* Locked to send out the data */
struct sctp_stream_queue_pending *sp;
sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
if (sp) {
if ((sp->length == 0) && (sp->msg_is_complete == 0))
asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
}
}
asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
if (TAILQ_EMPTY(&asoc->send_queue) &&
TAILQ_EMPTY(&asoc->sent_queue) &&
(asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
abort_anyway:
if (free_cnt_applied) {
atomic_add_int(&stcb->asoc.refcnt, -1);
free_cnt_applied = 0;
}
sctp_abort_an_association(stcb->sctp_ep, stcb,
SCTP_RESPONSE_TO_USER_REQ,
NULL);
/*
* now relock the stcb so everything
* is sane
*/
hold_tcblock = 0;
stcb = NULL;
goto out;
}
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
asoc->primary_destination);
}
}
}
skip_out_eof:
if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
some_on_control = 1;
}
if ((net->flight_size > net->cwnd) &&
(sctp_cmt_on_off == 0)) {
queue_only = 1;
} else if (asoc->ifp_had_enobuf) {
SCTP_STAT_INCR(sctps_ifnomemqueued);
if (net->flight_size > (net->mtu * 2)) {
queue_only = 1;
} else {
queue_only = 0;
}
asoc->ifp_had_enobuf = 0;
un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count) *
sizeof(struct sctp_data_chunk)));
} else {
un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count) *
sizeof(struct sctp_data_chunk)));
queue_only = 0;
}
if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
(stcb->asoc.total_flight > 0) &&
(un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
) {
/*
* Ok, Nagle is set on and we have data outstanding. Don't
* send anything and let SACKs drive out the data unless wen
* have a "full" segment to send.
*/
#ifdef SCTP_NAGLE_LOGGING
sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
#endif
SCTP_STAT_INCR(sctps_naglequeued);
nagle_applies = 1;
} else {
#ifdef SCTP_NAGLE_LOGGING
if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
#endif
SCTP_STAT_INCR(sctps_naglesent);
nagle_applies = 0;
}
if (queue_only_for_init) {
if (hold_tcblock == 0) {
SCTP_TCB_LOCK(stcb);
hold_tcblock = 1;
}
if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
/* a collision took us forward? */
queue_only_for_init = 0;
queue_only = 0;
} else {
sctp_send_initiate(inp, stcb);
stcb->asoc.state = SCTP_STATE_COOKIE_WAIT;
queue_only_for_init = 0;
queue_only = 1;
}
}
if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
/* we can attempt to send too. */
s = splnet();
if (hold_tcblock == 0) {
/*
* If there is activity recv'ing sacks no need to
* send
*/
if (SCTP_TCB_TRYLOCK(stcb)) {
sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND);
hold_tcblock = 1;
}
} else {
sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND);
}
splx(s);
} else if ((queue_only == 0) &&
(stcb->asoc.peers_rwnd == 0) &&
(stcb->asoc.total_flight == 0)) {
/* We get to have a probe outstanding */
if (hold_tcblock == 0) {
hold_tcblock = 1;
SCTP_TCB_LOCK(stcb);
}
sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND);
} else if (some_on_control) {
int num_out, reason, cwnd_full, frag_point;
/* Here we do control only */
if (hold_tcblock == 0) {
hold_tcblock = 1;
SCTP_TCB_LOCK(stcb);
}
frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
&reason, 1, &cwnd_full, 1, &now, &now_filled, frag_point);
}
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_OUTPUT1) {
printf("USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d \n",
queue_only, stcb->asoc.peers_rwnd, un_sent,
stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
stcb->asoc.total_output_queue_size);
}
#endif
out:
out_unlocked:
if (create_lock_applied) {
SCTP_ASOC_CREATE_UNLOCK(inp);
create_lock_applied = 0;
}
if ((stcb) && hold_tcblock) {
SCTP_TCB_UNLOCK(stcb);
}
if (stcb && free_cnt_applied) {
atomic_add_int(&stcb->asoc.refcnt, -1);
}
#ifdef INVARIANTS
if (stcb) {
if (mtx_owned(&stcb->tcb_mtx)) {
panic("Leaving with tcb mtx owned?");
}
if (mtx_owned(&stcb->tcb_send_mtx)) {
panic("Leaving with tcb send mtx owned?");
}
}
#endif
if (top) {
sctp_m_freem(top);
}
if (control) {
sctp_m_freem(control);
}
return (error);
}
/*
* generate an AUTHentication chunk, if required
*/
struct mbuf *
sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
struct sctp_auth_chunk **auth_ret, uint32_t * offset,
struct sctp_tcb *stcb, uint8_t chunk)
{
struct mbuf *m_auth;
struct sctp_auth_chunk *auth;
int chunk_len;
if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
(stcb == NULL))
return (m);
/* sysctl disabled auth? */
if (sctp_auth_disable)
return (m);
/* peer doesn't do auth... */
if (!stcb->asoc.peer_supports_auth) {
return (m);
}
/* does the requested chunk require auth? */
if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
return (m);
}
m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 1, M_DONTWAIT, 1, MT_HEADER);
if (m_auth == NULL) {
/* no mbuf's */
return (m);
}
/* reserve some space if this will be the first mbuf */
if (m == NULL)
m_auth->m_data += SCTP_MIN_OVERHEAD;
/* fill in the AUTH chunk details */
auth = mtod(m_auth, struct sctp_auth_chunk *);
bzero(auth, sizeof(*auth));
auth->ch.chunk_type = SCTP_AUTHENTICATION;
auth->ch.chunk_flags = 0;
chunk_len = sizeof(*auth) +
sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
auth->ch.chunk_length = htons(chunk_len);
auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
/* key id and hmac digest will be computed and filled in upon send */
/* save the offset where the auth was inserted into the chain */
if (m != NULL)
*offset = m->m_pkthdr.len;
else
*offset = 0;
/* update length and return pointer to the auth chunk */
m_auth->m_pkthdr.len = m_auth->m_len = chunk_len;
m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
if (auth_ret != NULL)
*auth_ret = auth;
return (m);
}
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