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freebsd-nq/sys/netinet/sctp_output.c
Randall Stewart 139bc87fda a) macro-ization of all mbuf and random number 
access plus timers. This makes the code
   more portable and able to change out the
   mbuf or timer system used more easily ;-)
b) removal of all use of pkt-hdr's until only
   the places we need them (before ip_output routines).
c) remove a bunch of code not needed due to <b> aka
   worrying about pkthdr's :-)
d) There was one last reorder problem it looks where
   if a restart occur's and we release and relock (at
   the point where we setup our alias vtag) we would
   end up possibly getting the wrong TSN in place. The
   code that fixed the TSN's just needed to be shifted
   around BEFORE the release of the lock.. also code that
   set the state (since this also could contribute).
Approved by:	gnn
2006-12-29 20:21:42 +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 = SCTP_BUF_LEN(control);
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 (SCTP_BUF_IS_EXTENDED(m) == 0) {
if ((aloc_size != MCLBYTES) &&
(allonebuf == 0)) {
aloc_size -= 10;
goto try_again;
}
sctp_m_freem(m);
return (NULL);
}
}
SCTP_BUF_LEN(m) = 0;
SCTP_BUF_NEXT(m) = SCTP_BUF_NEXT_PKT(m) = NULL;
#ifdef SCTP_MBUF_LOGGING
if (SCTP_BUF_IS_EXTENDED(m)) {
sctp_log_mb(m, SCTP_MBUF_IALLOC);
}
#endif
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 *);
SCTP_BUF_LEN(mret) = 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 = SCTP_BUF_NEXT(m_at)) {
cookie_sz += SCTP_BUF_LEN(m_at);
if (SCTP_BUF_NEXT(m_at) == NULL) {
SCTP_BUF_NEXT(m_at) = copy_init;
break;
}
}
for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
cookie_sz += SCTP_BUF_LEN(m_at);
if (SCTP_BUF_NEXT(m_at) == NULL) {
SCTP_BUF_NEXT(m_at) = copy_initack;
break;
}
}
for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
cookie_sz += SCTP_BUF_LEN(m_at);
if (SCTP_BUF_NEXT(m_at) == 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);
}
SCTP_BUF_LEN(sig) = 0;
SCTP_BUF_NEXT(m_at) = 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);
SCTP_BUF_LEN(sig) += 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 SCTP_BUF_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.
*/
/* Will need ifdefs around this */
struct mbuf *o_pak;
struct sctphdr *sctphdr;
int packet_length;
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);
}
/* 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.
*/
packet_length = sctp_calculate_len(m);
} else {
sctphdr->checksum = 0;
csum = sctp_calculate_sum(m, &packet_length, 0);
sctphdr->checksum = csum;
}
if (to->sa_family == AF_INET) {
struct ip *ip;
struct route iproute;
uint8_t tos_value;
o_pak = SCTP_GET_HEADER_FOR_OUTPUT(sizeof(struct ip));
if (o_pak == NULL) {
/* failed to prepend data, give up */
sctp_m_freem(m);
return (ENOMEM);
}
SCTP_BUF_LEN(SCTP_HEADER_TO_CHAIN(o_pak)) = sizeof(struct ip);
packet_length += sizeof(struct ip);
SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
ip = mtod(SCTP_HEADER_TO_CHAIN(o_pak), 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 = SCTP_HEADER_LEN(o_pak);
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_output 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(o_pak);
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(o_pak, 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;
}
o_pak = SCTP_GET_HEADER_FOR_OUTPUT(sizeof(struct ip6_hdr));
if (o_pak == NULL) {
/* failed to prepend data, give up */
sctp_m_freem(m);
return (ENOMEM);
}
SCTP_BUF_LEN(SCTP_HEADER_TO_CHAIN(o_pak)) = sizeof(struct ip6_hdr);
packet_length += sizeof(struct ip6_hdr);
SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
ip6h = mtod(SCTP_HEADER_TO_CHAIN(o_pak), 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 = (SCTP_HEADER_LEN(o_pak) - sizeof(struct ip6_hdr));
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(o_pak);
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(o_pak);
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(o_pak, ((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 (SCTP_OS_TIMER_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;
}
SCTP_BUF_LEN(m) = 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);
SCTP_BUF_LEN(m) += 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);
SCTP_BUF_LEN(m) += 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);
SCTP_BUF_LEN(m) += 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));
SCTP_BUF_LEN(m) += 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));
SCTP_BUF_LEN(m) += 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);
SCTP_BUF_LEN(m) += 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));
SCTP_BUF_LEN(m) += 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)+SCTP_BUF_LEN(m));
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);
SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
}
/* add HMAC_ALGO parameter */
hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
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);
SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
}
/* add CHUNKS parameter */
chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
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);
SCTP_BUF_LEN(m) += 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 */
p_len = 0;
for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
if (SCTP_BUF_NEXT(m_at) == NULL)
m_last = m_at;
p_len += SCTP_BUF_LEN(m_at);
}
initm->msg.ch.chunk_length = htons((p_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 = p_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;
}
p_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, 0, M_DONTWAIT, 1, MT_DATA);
if (op_err) {
SCTP_BUF_LEN(op_err) = 0;
/*
* pre-reserve space for ip and sctp
* header and chunk hdr
*/
SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
SCTP_BUF_RESV_UF(op_err, 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, 0, M_DONTWAIT, 1, MT_DATA);
if (op_err) {
SCTP_BUF_LEN(op_err) = 0;
SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
SCTP_BUF_RESV_UF(op_err, 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, 0, M_DONTWAIT, 1, MT_DATA);
if (m == NULL) {
/* No memory, INIT timer will re-attempt. */
if (op_err)
sctp_m_freem(op_err);
return;
}
SCTP_BUF_LEN(m) = 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);
SCTP_BUF_LEN(m) += 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));
SCTP_BUF_LEN(m) += 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));
SCTP_BUF_LEN(m) += 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);
SCTP_BUF_LEN(m) += 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));
SCTP_BUF_LEN(m) += 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)+SCTP_BUF_LEN(m));
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);
SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
/* add HMAC_ALGO parameter */
hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
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);
SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
}
/* add CHUNKS parameter */
chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
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);
SCTP_BUF_LEN(m) += 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) {
struct mbuf *ol;
int llen;
llen = 0;
ol = op_err;
while (ol) {
llen += SCTP_BUF_LEN(ol);
ol = SCTP_BUF_NEXT(ol);
}
if (llen % 4) {
/* must add a pad to the param */
uint32_t cpthis = 0;
int padlen;
padlen = 4 - (llen % 4);
m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
}
while (SCTP_BUF_NEXT(m_at) != NULL) {
m_at = SCTP_BUF_NEXT(m_at);
}
SCTP_BUF_NEXT(m_at) = op_err;
while (SCTP_BUF_NEXT(m_at) != NULL) {
m_at = SCTP_BUF_NEXT(m_at);
}
}
/* 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 */
p_len = 0;
for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
p_len += SCTP_BUF_LEN(m_tmp);
if (SCTP_BUF_NEXT(m_tmp) == 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 += (p_len - sizeof(struct sctphdr));
/* add a second time for the INIT-ACK in the cookie */
sz_of += (p_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 */
SCTP_BUF_NEXT(m_tmp) = m_cookie;
for (; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
p_len += SCTP_BUF_LEN(m_tmp);
if (SCTP_BUF_NEXT(m_tmp) == 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 = p_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;
}
p_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);
/*
* We could in theory (for sendall) pass the length in, but we would
* still have to hunt through the chain since we need to setup the
* tail_mbuf
*/
while (at) {
if (SCTP_BUF_NEXT(at) == NULL)
sp->tail_mbuf = at;
sp->length += SCTP_BUF_LEN(at);
at = SCTP_BUF_NEXT(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, 0, M_DONTWAIT, 1, MT_HEADER);
if (outchain == NULL) {
goto error_out;
}
SCTP_BUF_LEN(outchain) = 0;
*endofchain = outchain;
/* get the prepend space */
SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
} else {
/*
* We really should not get a NULL
* in endofchain
*/
/* find end */
m = outchain;
while (m) {
if (SCTP_BUF_NEXT(m) == NULL) {
*endofchain = m;
break;
}
m = SCTP_BUF_NEXT(m);
}
/* 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)+SCTP_BUF_LEN((*endofchain)));
/* Now lets copy it out */
if (len >= sizeofcpy) {
/* It all fits, copy it in */
m_copydata(clonechain, 0, sizeofcpy, cp);
SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
} else {
/* fill up the end of the chain */
if (len > 0) {
m_copydata(clonechain, 0, len, cp);
SCTP_BUF_LEN((*endofchain)) += len;
/* now we need another one */
sizeofcpy -= len;
}
m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
if (m == NULL) {
/* We failed */
goto error_out;
}
SCTP_BUF_NEXT((*endofchain)) = m;
*endofchain = m;
cp = mtod((*endofchain), caddr_t);
m_copydata(clonechain, len, sizeofcpy, cp);
SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
}
return (outchain);
} else {
/* copy the old fashion way */
appendchain = m_copy(clonechain, 0, M_COPYALL);
}
}
if (appendchain == NULL) {
/* error */
if (outchain)
sctp_m_freem(outchain);
return (NULL);
}
if (outchain) {
/* tack on to the end */
if (*endofchain != NULL) {
SCTP_BUF_NEXT(((*endofchain))) = appendchain;
} else {
m = outchain;
while (m) {
if (SCTP_BUF_NEXT(m) == NULL) {
SCTP_BUF_NEXT(m) = appendchain;
break;
}
m = SCTP_BUF_NEXT(m);
}
}
/*
* save off the end and update the end-chain postion
*/
m = appendchain;
while (m) {
if (SCTP_BUF_NEXT(m) == NULL) {
*endofchain = m;
break;
}
m = SCTP_BUF_NEXT(m);
}
return (outchain);
} else {
/* save off the end and update the end-chain postion */
m = appendchain;
while (m) {
if (SCTP_BUF_NEXT(m) == NULL) {
*endofchain = m;
break;
}
m = SCTP_BUF_NEXT(m);
}
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->sndlen) {
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;
SCTP_BUF_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(ca->sndlen);
}
/*
* 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 { \
SCTP_BUF_RESV_UF(m, ((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, 0, M_WAIT, 1, MT_DATA);
if (ret == NULL) {
/* TSNH */
return (NULL);
}
left = len;
SCTP_BUF_LEN(ret) = 0;
/* 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);
}
SCTP_BUF_LEN(at) = willcpy;
SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
left -= willcpy;
if (left > 0) {
SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
if (SCTP_BUF_NEXT(at) == NULL) {
goto err_out_now;
}
at = SCTP_BUF_NEXT(at);
SCTP_BUF_LEN(at) = 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) {
SCTP_FREE(ca);
return (ENOMEM);
}
} else {
/* Gather the length of the send */
struct mbuf *mat;
mat = m;
ca->sndlen = 0;
while (m) {
ca->sndlen += SCTP_BUF_LEN(m);
m = SCTP_BUF_NEXT(m);
}
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 (SCTP_BUF_IS_EXTENDED(sp->data)) {
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 && (SCTP_BUF_LEN(m) == 0)) {
sp->data = SCTP_BUF_NEXT(m);
SCTP_BUF_NEXT(m) = 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;
}
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, 0, M_DONTWAIT, 0, MT_DATA);
if (m == NULL) {
/*
* we're in trouble here. _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;
SCTP_BUF_NEXT(sp->data) = m;
}
sp->some_taken = some_taken;
sp->length += to_move;
sctp_free_a_chunk(stcb, chk);
SCTP_TCB_SEND_UNLOCK(stcb);
goto out_gu;
} else {
SCTP_BUF_LEN(m) = 0;
SCTP_BUF_NEXT(m) = chk->data;
chk->data = m;
M_ALIGN(chk->data, 4);
}
}
SCTP_BUF_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 (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
}
}
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 = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
/* pad added an mbuf */
chk->last_mbuf = lm;
}
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->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->send_size < (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->send_size, 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->send_size + omtu))
mtu -= (chk->send_size + omtu);
else
mtu = 0;
to_out += (chk->send_size + 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 (SCTP_OS_TIMER_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;
}
SCTP_BUF_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 (!SCTP_OS_TIMER_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 && (!SCTP_OS_TIMER_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 :> */
SCTP_BUF_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 (SCTP_OS_TIMER_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 (SCTP_OS_TIMER_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;
SCTP_BUF_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 += SCTP_BUF_LEN(mat);
mat = SCTP_BUF_NEXT(mat);
}
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;
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;
/* 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 = plen;
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 (chk_length % 4) {
/* need pad */
uint32_t cpthis = 0;
int padlen;
padlen = 4 - (chk_length % 4);
m_copyback(outchain, chk_length, 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), 0, M_DONTWAIT, 1, MT_HEADER);
if (cookie_ack == NULL) {
/* no mbuf's */
return (-1);
}
SCTP_BUF_RESV_UF(cookie_ack, 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);
SCTP_BUF_LEN(cookie_ack) = chk->send_size;
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), 0, M_DONTWAIT, 1, MT_HEADER);
if (m_shutdown_ack == NULL) {
/* no mbuf's */
return (-1);
}
SCTP_BUF_RESV_UF(m_shutdown_ack, 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);
SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
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), 0, M_DONTWAIT, 1, MT_HEADER);
if (m_shutdown == NULL) {
/* no mbuf's */
return (-1);
}
SCTP_BUF_RESV_UF(m_shutdown, 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);
SCTP_BUF_LEN(m_shutdown) = chk->send_size;
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;
int len;
SCTP_TCB_LOCK_ASSERT(stcb);
/* compose an ASCONF chunk, maximum length is PMTU */
m_asconf = sctp_compose_asconf(stcb, &len);
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 = 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, *m;
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 */
/* We no longer have pak headers here so m_copy is it */
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 = 0;
/* Get size */
m = m_ack;
while (m) {
chk->send_size += SCTP_BUF_LEN(m);
m = SCTP_BUF_NEXT(m);
}
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);
SCTP_BUF_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 (!SCTP_OS_TIMER_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;
}
SCTP_BUF_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 (SCTP_OS_TIMER_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 (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
sctp_send_sack(stcb);
SCTP_OS_TIMER_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, 0, M_DONTWAIT, 1, MT_DATA);
if (chk->data == NULL) {
atomic_subtract_int(&chk->whoTo->ref_count, 1);
sctp_free_a_chunk(stcb, chk);
return;
}
SCTP_BUF_RESV_UF(chk->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.
*/
SCTP_BUF_LEN(chk->data) = 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)));
SCTP_BUF_LEN(chk->data) = 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, 0, 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 */
SCTP_BUF_RESV_UF(a_chk->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)));
SCTP_BUF_LEN(a_chk->data) = 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), 0, 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 */
SCTP_BUF_NEXT(m_abort) = operr;
sz = 0;
if (operr) {
struct mbuf *n;
n = operr;
while (n) {
sz += SCTP_BUF_LEN(n);
n = SCTP_BUF_NEXT(n);
}
}
SCTP_BUF_LEN(m_abort) = sizeof(*abort);
if (m_out == NULL) {
/* NO Auth chunk prepended, so reserve space in front */
SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
m_out = m_abort;
} else {
/* Put AUTH chunk at the front of the chain */
SCTP_BUF_NEXT(m_end) = 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 */
SCTP_BUF_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), 0, M_DONTWAIT, 1, MT_HEADER);
if (m_shutdown_comp == NULL) {
/* no mbuf's */
return (-1);
}
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;
SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_msg);
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 *o_pak;
struct mbuf *mout;
struct ip *iph, *iph_out;
struct ip6_hdr *ip6, *ip6_out;
int offset_out, len;
struct sctp_shutdown_complete_msg *comp_cp;
/* Get room for the largest message */
len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_shutdown_complete_msg));
o_pak = SCTP_GET_HEADER_FOR_OUTPUT(len);
if (o_pak == NULL) {
/* no mbuf's */
return (-1);
}
mout = SCTP_HEADER_TO_CHAIN(o_pak);
iph = mtod(m, struct ip *);
iph_out = NULL;
ip6_out = NULL;
offset_out = 0;
if (iph->ip_v == IPVERSION) {
SCTP_BUF_LEN(mout) = sizeof(struct ip) +
sizeof(struct sctp_shutdown_complete_msg);
SCTP_BUF_NEXT(mout) = 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;
SCTP_BUF_LEN(mout) = sizeof(struct ip6_hdr) +
sizeof(struct sctp_shutdown_complete_msg);
SCTP_BUF_NEXT(mout) = 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;
/*
* ?? The old code had both the iph len + payload, I think
* this is wrong and would never have worked
*/
ip6_out->ip6_plen = sizeof(struct sctp_shutdown_complete_msg);
offset_out += sizeof(*ip6_out);
comp_cp = (struct sctp_shutdown_complete_msg *)(
(caddr_t)ip6_out + offset_out);
} else {
/* Currently not supported. */
return (-1);
}
SCTP_HEADER_LEN(o_pak) = SCTP_BUF_LEN(mout);
/* 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));
/* add checksum */
if ((sctp_no_csum_on_loopback) && SCTP_IS_IT_LOOPBACK(o_pak)) {
comp_cp->sh.checksum = 0;
} else {
comp_cp->sh.checksum = sctp_calculate_sum(mout, NULL, offset_out);
}
if (iph_out != NULL) {
struct route ro;
bzero(&ro, sizeof ro);
/* set IPv4 length */
iph_out->ip_len = SCTP_HEADER_LEN(o_pak);
/* out it goes */
ip_output(o_pak, 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(o_pak, 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, 0, M_DONTWAIT, 1, MT_HEADER);
if (chk->data == NULL) {
sctp_free_a_chunk(stcb, chk);
return (0);
}
SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
SCTP_BUF_LEN(chk->data) = 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, 0, M_DONTWAIT, 1, MT_HEADER);
if (chk->data == NULL) {
sctp_free_a_chunk(stcb, chk);
return;
}
SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
SCTP_BUF_LEN(chk->data) = 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);
}
chk->asoc = &stcb->asoc;
chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
if (chk->data == NULL) {
jump_out:
sctp_free_a_chunk(stcb, chk);
return;
}
SCTP_BUF_RESV_UF(chk->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);
SCTP_BUF_LEN(chk->data) = 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, 0, M_DONTWAIT, 1, MT_HEADER);
if (chk->data == NULL) {
sctp_free_a_chunk(stcb, chk);
return;
}
SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
SCTP_BUF_LEN(chk->data) = 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->book_size = len + old_len;
chk->send_size = SCTP_SIZE32(chk->book_size);
SCTP_BUF_LEN(chk->data) = 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->book_size = len + old_len;
chk->send_size = SCTP_SIZE32(chk->book_size);
SCTP_BUF_LEN(chk->data) = 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);
SCTP_BUF_LEN(chk->data) = 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->book_size = len + old_len;
chk->send_size = SCTP_SIZE32(chk->book_size);
SCTP_BUF_LEN(chk->data) = 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->book_size = len + old_len;
chk->send_size = SCTP_SIZE32(chk->book_size);
SCTP_BUF_LEN(chk->data) = 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 = sizeof(struct sctp_chunkhdr);
chk->send_size = SCTP_SIZE32(chk->book_size);
chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
if (chk->data == NULL) {
sctp_free_a_chunk(stcb, chk);
return (ENOMEM);
}
SCTP_BUF_RESV_UF(chk->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->book_size);
SCTP_BUF_LEN(chk->data) = 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 *o_pak;
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;
}
o_pak = SCTP_GET_HEADER_FOR_OUTPUT((sizeof(struct ip6_hdr) + sizeof(struct sctp_abort_msg)));
if (o_pak == NULL) {
if (err_cause)
sctp_m_freem(err_cause);
return;
}
mout = SCTP_HEADER_TO_CHAIN(o_pak);
iph = mtod(m, struct ip *);
iph_out = NULL;
ip6_out = NULL;
if (iph->ip_v == IPVERSION) {
iph_out = mtod(mout, struct ip *);
SCTP_BUF_LEN(mout) = sizeof(*iph_out) + sizeof(*abm);
SCTP_BUF_NEXT(mout) = 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 *);
SCTP_BUF_LEN(mout) = sizeof(*ip6_out) + sizeof(*abm);
SCTP_BUF_NEXT(mout) = 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 += SCTP_BUF_LEN(m_tmp);
m_tmp = SCTP_BUF_NEXT(m_tmp);
}
SCTP_HEADER_LEN(o_pak) = SCTP_BUF_LEN(mout) + err_len;
if (err_len % 4) {
/* need pad at end of chunk */
uint32_t cpthis = 0;
int padlen;
padlen = 4 - (SCTP_HEADER_LEN(o_pak) % 4);
m_copyback(mout, SCTP_HEADER_LEN(o_pak), padlen, (caddr_t)&cpthis);
SCTP_HEADER_LEN(o_pak) += padlen;
}
abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch) + err_len);
} else {
SCTP_HEADER_LEN(mout) = SCTP_BUF_LEN(mout);
abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch));
}
/* add checksum */
if ((sctp_no_csum_on_loopback) && SCTP_IS_IT_LOOPBACK(m)) {
abm->sh.checksum = 0;
} else {
abm->sh.checksum = sctp_calculate_sum(mout, NULL, iphlen_out);
}
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 = SCTP_HEADER_LEN(o_pak);
/* out it goes */
(void)ip_output(o_pak, 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_out->ip6_plen = SCTP_HEADER_LEN(o_pak) - sizeof(*ip6_out);
ip6_output(o_pak, 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 mbuf *o_pak;
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;
struct mbuf *at;
int len;
iph = mtod(m, struct ip *);
ihdr = (struct sctphdr *)((caddr_t)iph + iphlen);
SCTP_BUF_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;
len = 0;
at = scm;
while (at) {
len += SCTP_BUF_LEN(at);
at = SCTP_BUF_NEXT(at);
}
ophdr->chunk_length = htons(len - sizeof(struct sctphdr));
if (len % 4) {
/* need padding */
uint32_t cpthis = 0;
int padlen;
padlen = 4 - (len % 4);
m_copyback(scm, len, padlen, (caddr_t)&cpthis);
len += padlen;
}
if ((sctp_no_csum_on_loopback) && SCTP_IS_IT_LOOPBACK(m)) {
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;
o_pak = SCTP_GET_HEADER_FOR_OUTPUT(sizeof(struct ip));
if (o_pak == NULL) {
sctp_m_freem(scm);
return;
}
SCTP_BUF_LEN(SCTP_HEADER_TO_CHAIN(o_pak)) = sizeof(struct ip);
len += sizeof(struct ip);
SCTP_ATTACH_CHAIN(o_pak, scm, len);
bzero(&ro, sizeof ro);
out = mtod(SCTP_HEADER_TO_CHAIN(o_pak), 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 = SCTP_HEADER_LEN(o_pak);
retcode = ip_output(o_pak, 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;
o_pak = SCTP_GET_HEADER_FOR_OUTPUT(sizeof(struct ip6_hdr));
if (o_pak == NULL) {
sctp_m_freem(scm);
return;
}
SCTP_BUF_LEN(SCTP_HEADER_TO_CHAIN(o_pak)) = sizeof(struct ip6_hdr);
len += sizeof(struct ip6_hdr);
SCTP_ATTACH_CHAIN(o_pak, scm, len);
bzero(&ro, sizeof ro);
in6 = mtod(m, struct ip6_hdr *);
out6 = mtod(SCTP_HEADER_TO_CHAIN(o_pak), 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;
out6->ip6_plen = len - sizeof(struct ip6_hdr);
#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(o_pak, 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;
struct mbuf *m, *prev, *head;
left = min(uio->uio_resid, max_send_len);
/* Always get a header just in case */
head = sctp_get_mbuf_for_msg(left, 0, 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;
SCTP_BUF_LEN(head) = willcpy;
m = head;
*new_tail = head;
while (left > 0) {
/* move in user data */
SCTP_BUF_NEXT(m) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 0, MT_DATA);
if (SCTP_BUF_NEXT(m) == NULL) {
sctp_m_freem(head);
*new_tail = NULL;
*error = ENOMEM;
return (NULL);
}
prev = m;
m = SCTP_BUF_NEXT(m);
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);
}
SCTP_BUF_LEN(m) = willcpy;
left -= willcpy;
*sndout += willcpy;
*new_tail = m;
if (left == 0) {
SCTP_BUF_NEXT(m) = 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), 0, 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.
*/
SCTP_BUF_RESV_UF(m, 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);
}
SCTP_BUF_LEN(m) = willcpy;
left -= willcpy;
cpsz += willcpy;
if (left > 0) {
SCTP_BUF_NEXT(m) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 0, MT_DATA);
if (SCTP_BUF_NEXT(m) == NULL) {
/*
* the head goes back to caller, he can free
* the rest
*/
sctp_m_freem(head);
return (ENOMEM);
}
m = SCTP_BUF_NEXT(m);
cancpy = M_TRAILINGSPACE(m);
willcpy = min(cancpy, left);
} else {
sp->tail_mbuf = m;
SCTP_BUF_NEXT(m) = 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);
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 *i_pak,
struct mbuf *control,
int flags,
int use_rcvinfo,
struct sctp_sndrcvinfo *srcv,
struct thread *p
)
{
unsigned int sndlen, max_len;
int error, len;
struct mbuf *top = NULL;
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 = SCTP_HEADER_LEN(i_pak);
top = SCTP_HEADER_TO_CHAIN(i_pak);
}
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) {
struct mbuf *cntm;
mm = sctp_get_mbuf_for_msg(1, 0, M_WAIT, 1, MT_DATA);
tot_out = 0;
cntm = top;
while (cntm) {
tot_out += SCTP_BUF_LEN(cntm);
cntm = SCTP_BUF_NEXT(cntm);
}
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, 0, 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++;
SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
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 {
SCTP_BUF_NEXT(mm) = 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 */
SCTP_BUF_NEXT(sp->tail_mbuf) = 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;
}
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), 0, 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)
SCTP_BUF_RESV_UF(m_auth, 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) {
struct mbuf *cn;
*offset = 0;
cn = m;
while (cn) {
*offset += SCTP_BUF_LEN(cn);
cn = SCTP_BUF_NEXT(cn);
}
} else
*offset = 0;
/* update length and return pointer to the auth chunk */
SCTP_BUF_LEN(m_auth) = 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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