There should be no functional changes with this commit. Reviewed by: rscheff Differential revision: https://reviews.freebsd.org/D37123
1124 lines
31 KiB
C
1124 lines
31 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1982, 1986, 1988, 1990, 1993, 1994, 1995
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)tcp_input.c 8.12 (Berkeley) 5/24/95
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include "opt_tcpdebug.h"
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/* For debugging we want counters and BB logging */
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/* #define TCP_REASS_COUNTERS 1 */
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/* #define TCP_REASS_LOGGING 1 */
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/eventhandler.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/sysctl.h>
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#include <sys/syslog.h>
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#include <sys/systm.h>
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#include <vm/uma.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/route.h>
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#include <net/vnet.h>
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#include <netinet/in.h>
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#include <netinet/in_pcb.h>
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#include <netinet/in_systm.h>
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#include <netinet/in_var.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/ip_options.h>
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#include <netinet/ip6.h>
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#include <netinet6/in6_pcb.h>
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#include <netinet6/ip6_var.h>
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#include <netinet6/nd6.h>
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#include <netinet/tcp.h>
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#include <netinet/tcp_fsm.h>
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#include <netinet/tcp_seq.h>
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#include <netinet/tcp_timer.h>
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#include <netinet/tcp_var.h>
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#ifdef TCP_REASS_LOGGING
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#include <netinet/tcp_log_buf.h>
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#include <netinet/tcp_hpts.h>
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#endif
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#include <netinet/tcpip.h>
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#ifdef TCPDEBUG
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#include <netinet/tcp_debug.h>
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#endif /* TCPDEBUG */
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#define TCP_R_LOG_ADD 1
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#define TCP_R_LOG_LIMIT_REACHED 2
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#define TCP_R_LOG_APPEND 3
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#define TCP_R_LOG_PREPEND 4
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#define TCP_R_LOG_REPLACE 5
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#define TCP_R_LOG_MERGE_INTO 6
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#define TCP_R_LOG_NEW_ENTRY 7
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#define TCP_R_LOG_READ 8
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#define TCP_R_LOG_ZERO 9
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#define TCP_R_LOG_DUMP 10
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#define TCP_R_LOG_TRIM 11
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static SYSCTL_NODE(_net_inet_tcp, OID_AUTO, reass,
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CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
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"TCP Segment Reassembly Queue");
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static SYSCTL_NODE(_net_inet_tcp_reass, OID_AUTO, stats,
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CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
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"TCP Segment Reassembly stats");
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static int tcp_reass_maxseg = 0;
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SYSCTL_INT(_net_inet_tcp_reass, OID_AUTO, maxsegments, CTLFLAG_RDTUN,
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&tcp_reass_maxseg, 0,
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"Global maximum number of TCP Segments in Reassembly Queue");
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static uma_zone_t tcp_reass_zone;
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SYSCTL_UMA_CUR(_net_inet_tcp_reass, OID_AUTO, cursegments, 0,
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&tcp_reass_zone,
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"Global number of TCP Segments currently in Reassembly Queue");
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static u_int tcp_reass_maxqueuelen = 100;
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SYSCTL_UINT(_net_inet_tcp_reass, OID_AUTO, maxqueuelen, CTLFLAG_RWTUN,
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&tcp_reass_maxqueuelen, 0,
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"Maximum number of TCP Segments per Reassembly Queue");
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static int tcp_new_limits = 0;
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SYSCTL_INT(_net_inet_tcp_reass, OID_AUTO, new_limit, CTLFLAG_RWTUN,
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&tcp_new_limits, 0,
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"Do we use the new limit method we are discussing?");
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static u_int tcp_reass_queue_guard = 16;
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SYSCTL_UINT(_net_inet_tcp_reass, OID_AUTO, queueguard, CTLFLAG_RWTUN,
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&tcp_reass_queue_guard, 16,
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"Number of TCP Segments in Reassembly Queue where we flip over to guard mode");
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#ifdef TCP_REASS_COUNTERS
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counter_u64_t reass_entry;
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SYSCTL_COUNTER_U64(_net_inet_tcp_reass_stats, OID_AUTO, entry, CTLFLAG_RD,
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&reass_entry, "A segment entered reassembly ");
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counter_u64_t reass_path1;
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SYSCTL_COUNTER_U64(_net_inet_tcp_reass_stats, OID_AUTO, path1, CTLFLAG_RD,
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&reass_path1, "Took path 1");
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counter_u64_t reass_path2;
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SYSCTL_COUNTER_U64(_net_inet_tcp_reass_stats, OID_AUTO, path2, CTLFLAG_RD,
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&reass_path2, "Took path 2");
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counter_u64_t reass_path3;
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SYSCTL_COUNTER_U64(_net_inet_tcp_reass_stats, OID_AUTO, path3, CTLFLAG_RD,
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&reass_path3, "Took path 3");
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counter_u64_t reass_path4;
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SYSCTL_COUNTER_U64(_net_inet_tcp_reass_stats, OID_AUTO, path4, CTLFLAG_RD,
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&reass_path4, "Took path 4");
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counter_u64_t reass_path5;
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SYSCTL_COUNTER_U64(_net_inet_tcp_reass_stats, OID_AUTO, path5, CTLFLAG_RD,
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&reass_path5, "Took path 5");
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counter_u64_t reass_path6;
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SYSCTL_COUNTER_U64(_net_inet_tcp_reass_stats, OID_AUTO, path6, CTLFLAG_RD,
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&reass_path6, "Took path 6");
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counter_u64_t reass_path7;
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SYSCTL_COUNTER_U64(_net_inet_tcp_reass_stats, OID_AUTO, path7, CTLFLAG_RD,
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&reass_path7, "Took path 7");
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counter_u64_t reass_fullwalk;
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SYSCTL_COUNTER_U64(_net_inet_tcp_reass_stats, OID_AUTO, fullwalk, CTLFLAG_RD,
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&reass_fullwalk, "Took a full walk ");
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counter_u64_t reass_nospace;
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SYSCTL_COUNTER_U64(_net_inet_tcp_reass_stats, OID_AUTO, nospace, CTLFLAG_RD,
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&reass_nospace, "Had no mbuf capacity ");
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counter_u64_t merge_fwd;
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SYSCTL_COUNTER_U64(_net_inet_tcp_reass_stats, OID_AUTO, merge_fwd, CTLFLAG_RD,
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&merge_fwd, "Ran merge fwd");
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counter_u64_t merge_into;
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SYSCTL_COUNTER_U64(_net_inet_tcp_reass_stats, OID_AUTO, merge_into, CTLFLAG_RD,
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&merge_into, "Ran merge into");
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counter_u64_t tcp_zero_input;
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SYSCTL_COUNTER_U64(_net_inet_tcp_reass_stats, OID_AUTO, zero_input, CTLFLAG_RD,
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&tcp_zero_input, "The reassembly buffer saw a zero len segment etc");
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#endif
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/* Initialize TCP reassembly queue */
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static void
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tcp_reass_zone_change(void *tag)
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{
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/* Set the zone limit and read back the effective value. */
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tcp_reass_maxseg = nmbclusters / 16;
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tcp_reass_maxseg = uma_zone_set_max(tcp_reass_zone,
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tcp_reass_maxseg);
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}
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#ifdef TCP_REASS_LOGGING
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static void
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tcp_log_reassm(struct tcpcb *tp, struct tseg_qent *q, struct tseg_qent *p,
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tcp_seq seq, int len, uint8_t action, int instance)
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{
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struct socket *so = tptosocket(tp);
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uint32_t cts;
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struct timeval tv;
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if (tp->t_logstate != TCP_LOG_STATE_OFF) {
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union tcp_log_stackspecific log;
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memset(&log, 0, sizeof(log));
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cts = tcp_get_usecs(&tv);
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log.u_bbr.flex1 = seq;
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log.u_bbr.cur_del_rate = (uint64_t)q;
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log.u_bbr.delRate = (uint64_t)p;
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if (q != NULL) {
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log.u_bbr.flex2 = q->tqe_start;
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log.u_bbr.flex3 = q->tqe_len;
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log.u_bbr.flex4 = q->tqe_mbuf_cnt;
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log.u_bbr.hptsi_gain = q->tqe_flags;
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}
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if (p != NULL) {
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log.u_bbr.flex5 = p->tqe_start;
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log.u_bbr.pkts_out = p->tqe_len;
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log.u_bbr.epoch = p->tqe_mbuf_cnt;
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log.u_bbr.cwnd_gain = p->tqe_flags;
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}
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log.u_bbr.flex6 = tp->t_segqmbuflen;
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log.u_bbr.flex7 = instance;
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log.u_bbr.flex8 = action;
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log.u_bbr.timeStamp = cts;
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TCP_LOG_EVENTP(tp, NULL, &so->so_rcv, &so->so_snd,
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TCP_LOG_REASS, 0,
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len, &log, false, &tv);
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}
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}
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static void
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tcp_reass_log_dump(struct tcpcb *tp)
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{
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struct tseg_qent *q;
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if (tp->t_logstate != TCP_LOG_STATE_OFF) {
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TAILQ_FOREACH(q, &tp->t_segq, tqe_q) {
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tcp_log_reassm(tp, q, NULL, q->tqe_start, q->tqe_len, TCP_R_LOG_DUMP, 0);
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}
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};
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}
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static void
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tcp_reass_log_new_in(struct tcpcb *tp, tcp_seq seq, int len, struct mbuf *m,
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int logval, struct tseg_qent *q)
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{
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int cnt;
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struct mbuf *t;
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cnt = 0;
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t = m;
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while (t) {
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cnt += t->m_len;
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t = t->m_next;
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}
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tcp_log_reassm(tp, q, NULL, seq, len, logval, cnt);
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}
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#endif
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void
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tcp_reass_global_init(void)
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{
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tcp_reass_maxseg = nmbclusters / 16;
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TUNABLE_INT_FETCH("net.inet.tcp.reass.maxsegments",
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&tcp_reass_maxseg);
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tcp_reass_zone = uma_zcreate("tcpreass", sizeof (struct tseg_qent),
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NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
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/* Set the zone limit and read back the effective value. */
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tcp_reass_maxseg = uma_zone_set_max(tcp_reass_zone,
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tcp_reass_maxseg);
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#ifdef TCP_REASS_COUNTERS
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reass_path1 = counter_u64_alloc(M_WAITOK);
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reass_path2 = counter_u64_alloc(M_WAITOK);
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reass_path3 = counter_u64_alloc(M_WAITOK);
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reass_path4 = counter_u64_alloc(M_WAITOK);
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reass_path5 = counter_u64_alloc(M_WAITOK);
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reass_path6 = counter_u64_alloc(M_WAITOK);
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reass_path7 = counter_u64_alloc(M_WAITOK);
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reass_fullwalk = counter_u64_alloc(M_WAITOK);
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reass_nospace = counter_u64_alloc(M_WAITOK);
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reass_entry = counter_u64_alloc(M_WAITOK);
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merge_fwd = counter_u64_alloc(M_WAITOK);
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merge_into = counter_u64_alloc(M_WAITOK);
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tcp_zero_input = counter_u64_alloc(M_WAITOK);
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#endif
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EVENTHANDLER_REGISTER(nmbclusters_change,
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tcp_reass_zone_change, NULL, EVENTHANDLER_PRI_ANY);
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}
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void
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tcp_reass_flush(struct tcpcb *tp)
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{
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struct tseg_qent *qe;
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INP_WLOCK_ASSERT(tptoinpcb(tp));
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while ((qe = TAILQ_FIRST(&tp->t_segq)) != NULL) {
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TAILQ_REMOVE(&tp->t_segq, qe, tqe_q);
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m_freem(qe->tqe_m);
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uma_zfree(tcp_reass_zone, qe);
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tp->t_segqlen--;
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}
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tp->t_segqmbuflen = 0;
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KASSERT((tp->t_segqlen == 0),
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("TCP reass queue %p segment count is %d instead of 0 after flush.",
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tp, tp->t_segqlen));
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}
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static void
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tcp_reass_append(struct tcpcb *tp, struct tseg_qent *last,
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struct mbuf *m, struct tcphdr *th, int tlen,
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struct mbuf *mlast, int lenofoh)
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{
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#ifdef TCP_REASS_LOGGING
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tcp_log_reassm(tp, last, NULL, th->th_seq, tlen, TCP_R_LOG_APPEND, 0);
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#endif
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last->tqe_len += tlen;
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last->tqe_m->m_pkthdr.len += tlen;
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/* Preserve the FIN bit if its there */
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last->tqe_flags |= (tcp_get_flags(th) & TH_FIN);
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last->tqe_last->m_next = m;
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last->tqe_last = mlast;
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last->tqe_mbuf_cnt += lenofoh;
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tp->t_rcvoopack++;
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TCPSTAT_INC(tcps_rcvoopack);
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TCPSTAT_ADD(tcps_rcvoobyte, tlen);
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#ifdef TCP_REASS_LOGGING
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tcp_reass_log_new_in(tp, last->tqe_start, lenofoh, last->tqe_m,
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TCP_R_LOG_APPEND,
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last);
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#endif
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}
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static void
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tcp_reass_prepend(struct tcpcb *tp, struct tseg_qent *first, struct mbuf *m, struct tcphdr *th,
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int tlen, struct mbuf *mlast, int lenofoh)
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{
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int i;
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#ifdef TCP_REASS_LOGGING
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tcp_log_reassm(tp, first, NULL, th->th_seq, tlen, TCP_R_LOG_PREPEND, 0);
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#endif
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if (SEQ_GT((th->th_seq + tlen), first->tqe_start)) {
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/* The new data overlaps into the old */
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i = (th->th_seq + tlen) - first->tqe_start;
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#ifdef TCP_REASS_LOGGING
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tcp_log_reassm(tp, first, NULL, 0, i, TCP_R_LOG_TRIM, 1);
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#endif
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m_adj(first->tqe_m, i);
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first->tqe_len -= i;
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first->tqe_start += i;
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}
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/* Ok now setup our chain to point to the old first */
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mlast->m_next = first->tqe_m;
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first->tqe_m = m;
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first->tqe_len += tlen;
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first->tqe_start = th->th_seq;
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first->tqe_m->m_pkthdr.len = first->tqe_len;
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first->tqe_mbuf_cnt += lenofoh;
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tp->t_rcvoopack++;
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TCPSTAT_INC(tcps_rcvoopack);
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TCPSTAT_ADD(tcps_rcvoobyte, tlen);
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#ifdef TCP_REASS_LOGGING
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tcp_reass_log_new_in(tp, first->tqe_start, lenofoh, first->tqe_m,
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TCP_R_LOG_PREPEND,
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first);
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#endif
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}
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static void
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tcp_reass_replace(struct tcpcb *tp, struct tseg_qent *q, struct mbuf *m,
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tcp_seq seq, int len, struct mbuf *mlast, int mbufoh, uint16_t flags)
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{
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/*
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* Free the data in q, and replace
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* it with the new segment.
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*/
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int len_dif;
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#ifdef TCP_REASS_LOGGING
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tcp_log_reassm(tp, q, NULL, seq, len, TCP_R_LOG_REPLACE, 0);
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#endif
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m_freem(q->tqe_m);
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KASSERT(tp->t_segqmbuflen >= q->tqe_mbuf_cnt,
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("Tp:%p seg queue goes negative", tp));
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tp->t_segqmbuflen -= q->tqe_mbuf_cnt;
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q->tqe_mbuf_cnt = mbufoh;
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q->tqe_m = m;
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q->tqe_last = mlast;
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q->tqe_start = seq;
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if (len > q->tqe_len)
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len_dif = len - q->tqe_len;
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else
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len_dif = 0;
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tp->t_rcvoopack++;
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TCPSTAT_INC(tcps_rcvoopack);
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TCPSTAT_ADD(tcps_rcvoobyte, len_dif);
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q->tqe_len = len;
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q->tqe_flags = (flags & TH_FIN);
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q->tqe_m->m_pkthdr.len = q->tqe_len;
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tp->t_segqmbuflen += mbufoh;
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}
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static void
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tcp_reass_merge_into(struct tcpcb *tp, struct tseg_qent *ent,
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struct tseg_qent *q)
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{
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/*
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* Merge q into ent and free q from the list.
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*/
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#ifdef TCP_REASS_LOGGING
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tcp_log_reassm(tp, q, ent, 0, 0, TCP_R_LOG_MERGE_INTO, 0);
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#endif
|
|
#ifdef TCP_REASS_COUNTERS
|
|
counter_u64_add(merge_into, 1);
|
|
#endif
|
|
ent->tqe_last->m_next = q->tqe_m;
|
|
ent->tqe_last = q->tqe_last;
|
|
ent->tqe_len += q->tqe_len;
|
|
ent->tqe_mbuf_cnt += q->tqe_mbuf_cnt;
|
|
ent->tqe_m->m_pkthdr.len += q->tqe_len;
|
|
ent->tqe_flags |= (q->tqe_flags & TH_FIN);
|
|
TAILQ_REMOVE(&tp->t_segq, q, tqe_q);
|
|
uma_zfree(tcp_reass_zone, q);
|
|
tp->t_segqlen--;
|
|
|
|
}
|
|
|
|
static void
|
|
tcp_reass_merge_forward(struct tcpcb *tp, struct tseg_qent *ent)
|
|
{
|
|
struct tseg_qent *q, *qtmp;
|
|
int i;
|
|
tcp_seq max;
|
|
/*
|
|
* Given an entry merge forward anyplace
|
|
* that ent overlaps forward.
|
|
*/
|
|
|
|
max = ent->tqe_start + ent->tqe_len;
|
|
q = TAILQ_NEXT(ent, tqe_q);
|
|
if (q == NULL) {
|
|
/* Nothing left */
|
|
return;
|
|
}
|
|
TAILQ_FOREACH_FROM_SAFE(q, &tp->t_segq, tqe_q, qtmp) {
|
|
if (SEQ_GT(q->tqe_start, max)) {
|
|
/* Beyond q */
|
|
break;
|
|
}
|
|
/* We have some or all that are overlapping */
|
|
if (SEQ_GEQ(max, (q->tqe_start + q->tqe_len))) {
|
|
/* It consumes it all */
|
|
tp->t_segqmbuflen -= q->tqe_mbuf_cnt;
|
|
m_freem(q->tqe_m);
|
|
TAILQ_REMOVE(&tp->t_segq, q, tqe_q);
|
|
uma_zfree(tcp_reass_zone, q);
|
|
tp->t_segqlen--;
|
|
continue;
|
|
}
|
|
/*
|
|
* Trim the q entry to dovetail to this one
|
|
* and then merge q into ent updating max
|
|
* in the process.
|
|
*/
|
|
i = max - q->tqe_start;
|
|
#ifdef TCP_REASS_LOGGING
|
|
tcp_log_reassm(tp, q, NULL, 0, i, TCP_R_LOG_TRIM, 2);
|
|
#endif
|
|
m_adj(q->tqe_m, i);
|
|
q->tqe_len -= i;
|
|
q->tqe_start += i;
|
|
tcp_reass_merge_into(tp, ent, q);
|
|
max = ent->tqe_start + ent->tqe_len;
|
|
}
|
|
#ifdef TCP_REASS_COUNTERS
|
|
counter_u64_add(merge_fwd, 1);
|
|
#endif
|
|
}
|
|
|
|
static int
|
|
tcp_reass_overhead_of_chain(struct mbuf *m, struct mbuf **mlast)
|
|
{
|
|
int len = MSIZE;
|
|
|
|
if (m->m_flags & M_EXT)
|
|
len += m->m_ext.ext_size;
|
|
while (m->m_next != NULL) {
|
|
m = m->m_next;
|
|
len += MSIZE;
|
|
if (m->m_flags & M_EXT)
|
|
len += m->m_ext.ext_size;
|
|
}
|
|
*mlast = m;
|
|
return (len);
|
|
}
|
|
|
|
/*
|
|
* NOTE!!! the new tcp-reassembly code *must not* use
|
|
* m_adj() with a negative index. That alters the chain
|
|
* of mbufs (by possibly chopping trailing mbufs). At
|
|
* the front of tcp_reass we count the mbuf overhead
|
|
* and setup the tail pointer. If we use m_adj(m, -5)
|
|
* we could corrupt the tail pointer. Currently the
|
|
* code only uses m_adj(m, postive-num). If this
|
|
* changes appropriate changes to update mlast would
|
|
* be needed.
|
|
*/
|
|
int
|
|
tcp_reass(struct tcpcb *tp, struct tcphdr *th, tcp_seq *seq_start,
|
|
int *tlenp, struct mbuf *m)
|
|
{
|
|
struct tseg_qent *q, *last, *first;
|
|
struct tseg_qent *p = NULL;
|
|
struct tseg_qent *nq = NULL;
|
|
struct tseg_qent *te = NULL;
|
|
struct mbuf *mlast = NULL;
|
|
struct inpcb *inp = tptoinpcb(tp);
|
|
struct socket *so = tptosocket(tp);
|
|
struct sockbuf *sb = &so->so_rcv;
|
|
char *s = NULL;
|
|
int flags, i, lenofoh;
|
|
|
|
INP_WLOCK_ASSERT(inp);
|
|
/*
|
|
* XXX: tcp_reass() is rather inefficient with its data structures
|
|
* and should be rewritten (see NetBSD for optimizations).
|
|
*/
|
|
|
|
KASSERT(th == NULL || (seq_start != NULL && tlenp != NULL),
|
|
("tcp_reass called with illegal parameter combination "
|
|
"(tp=%p, th=%p, seq_start=%p, tlenp=%p, m=%p)",
|
|
tp, th, seq_start, tlenp, m));
|
|
/*
|
|
* Call with th==NULL after become established to
|
|
* force pre-ESTABLISHED data up to user socket.
|
|
*/
|
|
if (th == NULL)
|
|
goto present;
|
|
KASSERT(SEQ_GEQ(th->th_seq, tp->rcv_nxt),
|
|
("Attempt to add old entry to reassembly queue (th=%p, tp=%p)",
|
|
th, tp));
|
|
#ifdef TCP_REASS_LOGGING
|
|
tcp_reass_log_new_in(tp, th->th_seq, *tlenp, m, TCP_R_LOG_ADD, NULL);
|
|
#endif
|
|
#ifdef TCP_REASS_COUNTERS
|
|
counter_u64_add(reass_entry, 1);
|
|
#endif
|
|
/*
|
|
* Check for zero length data.
|
|
*/
|
|
if ((*tlenp == 0) && ((tcp_get_flags(th) & TH_FIN) == 0)) {
|
|
/*
|
|
* A zero length segment does no
|
|
* one any good. We could check
|
|
* the rcv_nxt <-> rcv_wnd but thats
|
|
* already done for us by the caller.
|
|
*/
|
|
strip_fin:
|
|
#ifdef TCP_REASS_COUNTERS
|
|
counter_u64_add(tcp_zero_input, 1);
|
|
#endif
|
|
m_freem(m);
|
|
#ifdef TCP_REASS_LOGGING
|
|
tcp_reass_log_dump(tp);
|
|
#endif
|
|
return (0);
|
|
} else if ((*tlenp == 0) &&
|
|
(tcp_get_flags(th) & TH_FIN) &&
|
|
!TCPS_HAVEESTABLISHED(tp->t_state)) {
|
|
/*
|
|
* We have not established, and we
|
|
* have a FIN and no data. Lets treat
|
|
* this as the same as if the FIN were
|
|
* not present. We don't want to save
|
|
* the FIN bit in a reassembly buffer
|
|
* we want to get established first before
|
|
* we do that (the peer will retransmit).
|
|
*/
|
|
goto strip_fin;
|
|
}
|
|
/*
|
|
* Will it fit?
|
|
*/
|
|
lenofoh = tcp_reass_overhead_of_chain(m, &mlast);
|
|
if ((th->th_seq != tp->rcv_nxt || !TCPS_HAVEESTABLISHED(tp->t_state)) &&
|
|
(sb->sb_mbcnt + tp->t_segqmbuflen + lenofoh) > sb->sb_mbmax) {
|
|
/* No room */
|
|
TCPSTAT_INC(tcps_rcvreassfull);
|
|
#ifdef TCP_REASS_COUNTERS
|
|
counter_u64_add(reass_nospace, 1);
|
|
#endif
|
|
#ifdef TCP_REASS_LOGGING
|
|
tcp_log_reassm(tp, NULL, NULL, th->th_seq, lenofoh, TCP_R_LOG_LIMIT_REACHED, 0);
|
|
#endif
|
|
if ((s = tcp_log_addrs(&inp->inp_inc, th, NULL, NULL))) {
|
|
log(LOG_DEBUG, "%s; %s: mbuf count limit reached, "
|
|
"segment dropped\n", s, __func__);
|
|
free(s, M_TCPLOG);
|
|
}
|
|
m_freem(m);
|
|
*tlenp = 0;
|
|
#ifdef TCP_REASS_LOGGING
|
|
tcp_reass_log_dump(tp);
|
|
#endif
|
|
return (0);
|
|
}
|
|
/*
|
|
* First lets deal with two common cases, the
|
|
* segment appends to the back of our collected
|
|
* segments. Or the segment is the next in line.
|
|
*/
|
|
last = TAILQ_LAST_FAST(&tp->t_segq, tseg_qent, tqe_q);
|
|
if (last != NULL) {
|
|
if ((tcp_get_flags(th) & TH_FIN) &&
|
|
SEQ_LT((th->th_seq + *tlenp), (last->tqe_start + last->tqe_len))) {
|
|
/*
|
|
* Someone is trying to game us, dump
|
|
* the segment.
|
|
*/
|
|
*tlenp = 0;
|
|
m_freem(m);
|
|
return (0);
|
|
}
|
|
if ((SEQ_GEQ(th->th_seq, last->tqe_start)) &&
|
|
(SEQ_GEQ((last->tqe_start + last->tqe_len), th->th_seq))) {
|
|
/* Common case, trailing segment is added */
|
|
/**
|
|
* +--last
|
|
* v
|
|
* reassembly buffer |---| |---| |---|
|
|
* new segment |---|
|
|
*/
|
|
#ifdef TCP_REASS_COUNTERS
|
|
counter_u64_add(reass_path1, 1);
|
|
#endif
|
|
if (SEQ_GT((last->tqe_start + last->tqe_len), th->th_seq)) {
|
|
i = (last->tqe_start + last->tqe_len) - th->th_seq;
|
|
if (i < *tlenp) {
|
|
#ifdef TCP_REASS_LOGGING
|
|
tcp_log_reassm(tp, last, NULL, 0, i, TCP_R_LOG_TRIM, 3);
|
|
th->th_seq += i;
|
|
#endif
|
|
m_adj(m, i);
|
|
*tlenp -= i;
|
|
} else {
|
|
/* Complete overlap */
|
|
TCPSTAT_INC(tcps_rcvduppack);
|
|
TCPSTAT_ADD(tcps_rcvdupbyte, *tlenp);
|
|
m_freem(m);
|
|
*tlenp = last->tqe_len;
|
|
*seq_start = last->tqe_start;
|
|
return (0);
|
|
}
|
|
}
|
|
if (last->tqe_flags & TH_FIN) {
|
|
/*
|
|
* We have data after the FIN on the last?
|
|
*/
|
|
*tlenp = 0;
|
|
m_freem(m);
|
|
return(0);
|
|
}
|
|
tcp_reass_append(tp, last, m, th, *tlenp, mlast, lenofoh);
|
|
tp->t_segqmbuflen += lenofoh;
|
|
*seq_start = last->tqe_start;
|
|
*tlenp = last->tqe_len;
|
|
return (0);
|
|
} else if (SEQ_GT(th->th_seq, (last->tqe_start + last->tqe_len))) {
|
|
/*
|
|
* Second common case, we missed
|
|
* another one and have something more
|
|
* for the end.
|
|
*/
|
|
/**
|
|
* +--last
|
|
* v
|
|
* reassembly buffer |---| |---| |---|
|
|
* new segment |---|
|
|
*/
|
|
if (last->tqe_flags & TH_FIN) {
|
|
/*
|
|
* We have data after the FIN on the last?
|
|
*/
|
|
*tlenp = 0;
|
|
m_freem(m);
|
|
return(0);
|
|
}
|
|
#ifdef TCP_REASS_COUNTERS
|
|
counter_u64_add(reass_path2, 1);
|
|
#endif
|
|
p = last;
|
|
goto new_entry;
|
|
}
|
|
} else {
|
|
/* First segment (it's NULL). */
|
|
goto new_entry;
|
|
}
|
|
first = TAILQ_FIRST(&tp->t_segq);
|
|
if (SEQ_LT(th->th_seq, first->tqe_start) &&
|
|
SEQ_GEQ((th->th_seq + *tlenp),first->tqe_start) &&
|
|
SEQ_LT((th->th_seq + *tlenp), (first->tqe_start + first->tqe_len))) {
|
|
/*
|
|
* The head of the queue is prepended by this and
|
|
* it may be the one I want most.
|
|
*/
|
|
/**
|
|
* first-------+
|
|
* v
|
|
* rea: |---| |---| |---|
|
|
* new: |---|
|
|
* Note the case we do not deal with here is:
|
|
* rea= |---| |---| |---|
|
|
* new= |----|
|
|
* Due to the fact that it could be
|
|
* new |--------------------|
|
|
* And we might need to merge forward.
|
|
*/
|
|
#ifdef INVARIANTS
|
|
struct mbuf *firstmbuf;
|
|
#endif
|
|
|
|
#ifdef TCP_REASS_COUNTERS
|
|
counter_u64_add(reass_path3, 1);
|
|
#endif
|
|
if (SEQ_LT(th->th_seq, tp->rcv_nxt)) {
|
|
/*
|
|
* The resend was even before
|
|
* what we have. We need to trim it.
|
|
* Note TSNH (it should be trimmed
|
|
* before the call to tcp_reass()).
|
|
*/
|
|
#ifdef INVARIANTS
|
|
panic("th->th_seq:%u rcv_nxt:%u tp:%p not pre-trimmed",
|
|
th->th_seq, tp->rcv_nxt, tp);
|
|
#else
|
|
i = tp->rcv_nxt - th->th_seq;
|
|
#ifdef TCP_REASS_LOGGING
|
|
tcp_log_reassm(tp, first, NULL, 0, i, TCP_R_LOG_TRIM, 4);
|
|
#endif
|
|
m_adj(m, i);
|
|
th->th_seq += i;
|
|
*tlenp -= i;
|
|
#endif
|
|
}
|
|
#ifdef INVARIANTS
|
|
firstmbuf = first->tqe_m;
|
|
#endif
|
|
tcp_reass_prepend(tp, first, m, th, *tlenp, mlast, lenofoh);
|
|
#ifdef INVARIANTS
|
|
if (firstmbuf == first->tqe_m) {
|
|
panic("First stayed same m:%p foobar:%p first->tqe_m:%p tp:%p first:%p",
|
|
m, firstmbuf, first->tqe_m, tp, first);
|
|
} else if (first->tqe_m != m) {
|
|
panic("First did not change to m:%p foobar:%p first->tqe_m:%p tp:%p first:%p",
|
|
m, firstmbuf, first->tqe_m, tp, first);
|
|
}
|
|
#endif
|
|
tp->t_segqmbuflen += lenofoh;
|
|
*seq_start = first->tqe_start;
|
|
*tlenp = first->tqe_len;
|
|
goto present;
|
|
} else if (SEQ_LT((th->th_seq + *tlenp), first->tqe_start)) {
|
|
/* New segment is before our earliest segment. */
|
|
/**
|
|
* first---->+
|
|
* v
|
|
* rea= |---| ....
|
|
* new" |---|
|
|
*
|
|
*/
|
|
goto new_entry;
|
|
}
|
|
/*
|
|
* Find a segment which begins after this one does.
|
|
*/
|
|
#ifdef TCP_REASS_COUNTERS
|
|
counter_u64_add(reass_fullwalk, 1);
|
|
#endif
|
|
TAILQ_FOREACH(q, &tp->t_segq, tqe_q) {
|
|
if (SEQ_GT(q->tqe_start, th->th_seq))
|
|
break;
|
|
}
|
|
p = TAILQ_PREV(q, tsegqe_head, tqe_q);
|
|
/**
|
|
* Now is this fit just in-between only?
|
|
* i.e.:
|
|
* p---+ +----q
|
|
* v v
|
|
* res= |--| |--| |--|
|
|
* nee |-|
|
|
*/
|
|
if (SEQ_LT((th->th_seq + *tlenp), q->tqe_start) &&
|
|
((p == NULL) || (SEQ_GT(th->th_seq, (p->tqe_start + p->tqe_len))))) {
|
|
/* Yep no overlap */
|
|
goto new_entry;
|
|
}
|
|
/**
|
|
* If we reach here we have some (possibly all) overlap
|
|
* such as:
|
|
* res= |--| |--| |--|
|
|
* new= |----|
|
|
* or new= |-----------------|
|
|
* or new= |--------|
|
|
* or new= |---|
|
|
* or new= |-----------|
|
|
*/
|
|
if ((p != NULL) &&
|
|
(SEQ_LEQ(th->th_seq, (p->tqe_start + p->tqe_len)))) {
|
|
/* conversion to int (in i) handles seq wraparound */
|
|
|
|
#ifdef TCP_REASS_COUNTERS
|
|
counter_u64_add(reass_path4, 1);
|
|
#endif
|
|
i = p->tqe_start + p->tqe_len - th->th_seq;
|
|
if (i >= 0) {
|
|
if (i >= *tlenp) {
|
|
/**
|
|
* prev seg---->+
|
|
* v
|
|
* reassembly buffer |---|
|
|
* new segment |-|
|
|
*/
|
|
TCPSTAT_INC(tcps_rcvduppack);
|
|
TCPSTAT_ADD(tcps_rcvdupbyte, *tlenp);
|
|
*tlenp = p->tqe_len;
|
|
*seq_start = p->tqe_start;
|
|
m_freem(m);
|
|
/*
|
|
* Try to present any queued data
|
|
* at the left window edge to the user.
|
|
* This is needed after the 3-WHS
|
|
* completes. Note this probably
|
|
* will not work and we will return.
|
|
*/
|
|
return (0);
|
|
}
|
|
if (i > 0) {
|
|
/**
|
|
* prev seg---->+
|
|
* v
|
|
* reassembly buffer |---|
|
|
* new segment |-----|
|
|
*/
|
|
#ifdef TCP_REASS_COUNTERS
|
|
counter_u64_add(reass_path5, 1);
|
|
#endif
|
|
#ifdef TCP_REASS_LOGGING
|
|
tcp_log_reassm(tp, p, NULL, 0, i, TCP_R_LOG_TRIM, 5);
|
|
#endif
|
|
m_adj(m, i);
|
|
*tlenp -= i;
|
|
th->th_seq += i;
|
|
}
|
|
}
|
|
if (th->th_seq == (p->tqe_start + p->tqe_len)) {
|
|
/*
|
|
* If dovetails in with this one
|
|
* append it.
|
|
*/
|
|
/**
|
|
* prev seg---->+
|
|
* v
|
|
* reassembly buffer |--| |---|
|
|
* new segment |--|
|
|
* (note: it was trimmed above if it overlapped)
|
|
*/
|
|
tcp_reass_append(tp, p, m, th, *tlenp, mlast, lenofoh);
|
|
tp->t_segqmbuflen += lenofoh;
|
|
} else {
|
|
#ifdef INVARIANTS
|
|
panic("Impossible cut th_seq:%u p->seq:%u(%d) p:%p tp:%p",
|
|
th->th_seq, p->tqe_start, p->tqe_len,
|
|
p, tp);
|
|
#endif
|
|
*tlenp = 0;
|
|
m_freem(m);
|
|
return (0);
|
|
}
|
|
q = p;
|
|
} else {
|
|
/*
|
|
* The new data runs over the
|
|
* top of previously sack'd data (in q).
|
|
* It may be partially overlapping, or
|
|
* it may overlap the entire segment.
|
|
*/
|
|
#ifdef TCP_REASS_COUNTERS
|
|
counter_u64_add(reass_path6, 1);
|
|
#endif
|
|
if (SEQ_GEQ((th->th_seq + *tlenp), (q->tqe_start + q->tqe_len))) {
|
|
/* It consumes it all */
|
|
/**
|
|
* next seg---->+
|
|
* v
|
|
* reassembly buffer |--| |---|
|
|
* new segment |----------|
|
|
*/
|
|
#ifdef TCP_REASS_COUNTERS
|
|
counter_u64_add(reass_path7, 1);
|
|
#endif
|
|
tcp_reass_replace(tp, q, m, th->th_seq, *tlenp, mlast, lenofoh, tcp_get_flags(th));
|
|
} else {
|
|
/*
|
|
* We just need to prepend the data
|
|
* to this. It does not overrun
|
|
* the end.
|
|
*/
|
|
/**
|
|
* next seg---->+
|
|
* v
|
|
* reassembly buffer |--| |---|
|
|
* new segment |----------|
|
|
*/
|
|
tcp_reass_prepend(tp, q, m, th, *tlenp, mlast, lenofoh);
|
|
tp->t_segqmbuflen += lenofoh;
|
|
}
|
|
}
|
|
/* Now does it go further than that? */
|
|
tcp_reass_merge_forward(tp, q);
|
|
*seq_start = q->tqe_start;
|
|
*tlenp = q->tqe_len;
|
|
goto present;
|
|
|
|
/*
|
|
* When we reach here we can't combine it
|
|
* with any existing segment.
|
|
*
|
|
* Limit the number of segments that can be queued to reduce the
|
|
* potential for mbuf exhaustion. For best performance, we want to be
|
|
* able to queue a full window's worth of segments. The size of the
|
|
* socket receive buffer determines our advertised window and grows
|
|
* automatically when socket buffer autotuning is enabled. Use it as the
|
|
* basis for our queue limit.
|
|
*
|
|
* However, allow the user to specify a ceiling for the number of
|
|
* segments in each queue.
|
|
*
|
|
* Always let the missing segment through which caused this queue.
|
|
* NB: Access to the socket buffer is left intentionally unlocked as we
|
|
* can tolerate stale information here.
|
|
*
|
|
* XXXLAS: Using sbspace(so->so_rcv) instead of so->so_rcv.sb_hiwat
|
|
* should work but causes packets to be dropped when they shouldn't.
|
|
* Investigate why and re-evaluate the below limit after the behaviour
|
|
* is understood.
|
|
*/
|
|
new_entry:
|
|
if (th->th_seq == tp->rcv_nxt && TCPS_HAVEESTABLISHED(tp->t_state)) {
|
|
tp->rcv_nxt += *tlenp;
|
|
flags = tcp_get_flags(th) & TH_FIN;
|
|
TCPSTAT_INC(tcps_rcvoopack);
|
|
TCPSTAT_ADD(tcps_rcvoobyte, *tlenp);
|
|
SOCKBUF_LOCK(&so->so_rcv);
|
|
if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
|
|
m_freem(m);
|
|
} else {
|
|
sbappendstream_locked(&so->so_rcv, m, 0);
|
|
}
|
|
tp->t_flags |= TF_WAKESOR;
|
|
return (flags);
|
|
}
|
|
if (tcp_new_limits) {
|
|
if ((tp->t_segqlen > tcp_reass_queue_guard) &&
|
|
(*tlenp < MSIZE)) {
|
|
/*
|
|
* This is really a lie, we are not full but
|
|
* are getting a segment that is above
|
|
* guard threshold. If it is and its below
|
|
* a mbuf size (256) we drop it if it
|
|
* can't fill in some place.
|
|
*/
|
|
TCPSTAT_INC(tcps_rcvreassfull);
|
|
*tlenp = 0;
|
|
if ((s = tcp_log_addrs(&inp->inp_inc, th, NULL, NULL))) {
|
|
log(LOG_DEBUG, "%s; %s: queue limit reached, "
|
|
"segment dropped\n", s, __func__);
|
|
free(s, M_TCPLOG);
|
|
}
|
|
m_freem(m);
|
|
#ifdef TCP_REASS_LOGGING
|
|
tcp_reass_log_dump(tp);
|
|
#endif
|
|
return (0);
|
|
}
|
|
} else {
|
|
if (tp->t_segqlen >= min((so->so_rcv.sb_hiwat / tp->t_maxseg) + 1,
|
|
tcp_reass_maxqueuelen)) {
|
|
TCPSTAT_INC(tcps_rcvreassfull);
|
|
*tlenp = 0;
|
|
if ((s = tcp_log_addrs(&inp->inp_inc, th, NULL, NULL))) {
|
|
log(LOG_DEBUG, "%s; %s: queue limit reached, "
|
|
"segment dropped\n", s, __func__);
|
|
free(s, M_TCPLOG);
|
|
}
|
|
m_freem(m);
|
|
#ifdef TCP_REASS_LOGGING
|
|
tcp_reass_log_dump(tp);
|
|
#endif
|
|
return (0);
|
|
}
|
|
}
|
|
/*
|
|
* Allocate a new queue entry. If we can't, or hit the zone limit
|
|
* just drop the pkt.
|
|
*/
|
|
te = uma_zalloc(tcp_reass_zone, M_NOWAIT);
|
|
if (te == NULL) {
|
|
TCPSTAT_INC(tcps_rcvmemdrop);
|
|
m_freem(m);
|
|
*tlenp = 0;
|
|
if ((s = tcp_log_addrs(&inp->inp_inc, th, NULL, NULL))) {
|
|
log(LOG_DEBUG, "%s; %s: global zone limit "
|
|
"reached, segment dropped\n", s, __func__);
|
|
free(s, M_TCPLOG);
|
|
}
|
|
return (0);
|
|
}
|
|
tp->t_segqlen++;
|
|
tp->t_rcvoopack++;
|
|
TCPSTAT_INC(tcps_rcvoopack);
|
|
TCPSTAT_ADD(tcps_rcvoobyte, *tlenp);
|
|
/* Insert the new segment queue entry into place. */
|
|
te->tqe_m = m;
|
|
te->tqe_flags = tcp_get_flags(th);
|
|
te->tqe_len = *tlenp;
|
|
te->tqe_start = th->th_seq;
|
|
te->tqe_last = mlast;
|
|
te->tqe_mbuf_cnt = lenofoh;
|
|
tp->t_segqmbuflen += te->tqe_mbuf_cnt;
|
|
if (p == NULL) {
|
|
TAILQ_INSERT_HEAD(&tp->t_segq, te, tqe_q);
|
|
} else {
|
|
TAILQ_INSERT_AFTER(&tp->t_segq, p, te, tqe_q);
|
|
}
|
|
#ifdef TCP_REASS_LOGGING
|
|
tcp_reass_log_new_in(tp, th->th_seq, *tlenp, m, TCP_R_LOG_NEW_ENTRY, te);
|
|
#endif
|
|
present:
|
|
/*
|
|
* Present data to user, advancing rcv_nxt through
|
|
* completed sequence space.
|
|
*/
|
|
if (!TCPS_HAVEESTABLISHED(tp->t_state))
|
|
return (0);
|
|
q = TAILQ_FIRST(&tp->t_segq);
|
|
KASSERT(q == NULL || SEQ_GEQ(q->tqe_start, tp->rcv_nxt),
|
|
("Reassembly queue for %p has stale entry at head", tp));
|
|
if (!q || q->tqe_start != tp->rcv_nxt) {
|
|
#ifdef TCP_REASS_LOGGING
|
|
tcp_reass_log_dump(tp);
|
|
#endif
|
|
return (0);
|
|
}
|
|
SOCKBUF_LOCK(&so->so_rcv);
|
|
do {
|
|
tp->rcv_nxt += q->tqe_len;
|
|
flags = q->tqe_flags & TH_FIN;
|
|
nq = TAILQ_NEXT(q, tqe_q);
|
|
TAILQ_REMOVE(&tp->t_segq, q, tqe_q);
|
|
if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
|
|
m_freem(q->tqe_m);
|
|
} else {
|
|
#ifdef TCP_REASS_LOGGING
|
|
tcp_reass_log_new_in(tp, q->tqe_start, q->tqe_len, q->tqe_m, TCP_R_LOG_READ, q);
|
|
if (th != NULL) {
|
|
tcp_log_reassm(tp, q, NULL, th->th_seq, *tlenp, TCP_R_LOG_READ, 1);
|
|
} else {
|
|
tcp_log_reassm(tp, q, NULL, 0, 0, TCP_R_LOG_READ, 1);
|
|
}
|
|
#endif
|
|
sbappendstream_locked(&so->so_rcv, q->tqe_m, 0);
|
|
}
|
|
#ifdef TCP_REASS_LOGGING
|
|
if (th != NULL) {
|
|
tcp_log_reassm(tp, q, NULL, th->th_seq, *tlenp, TCP_R_LOG_READ, 2);
|
|
} else {
|
|
tcp_log_reassm(tp, q, NULL, 0, 0, TCP_R_LOG_READ, 2);
|
|
}
|
|
#endif
|
|
KASSERT(tp->t_segqmbuflen >= q->tqe_mbuf_cnt,
|
|
("tp:%p seg queue goes negative", tp));
|
|
tp->t_segqmbuflen -= q->tqe_mbuf_cnt;
|
|
uma_zfree(tcp_reass_zone, q);
|
|
tp->t_segqlen--;
|
|
q = nq;
|
|
} while (q && q->tqe_start == tp->rcv_nxt);
|
|
if (TAILQ_EMPTY(&tp->t_segq) &&
|
|
(tp->t_segqmbuflen != 0)) {
|
|
#ifdef INVARIANTS
|
|
panic("tp:%p segq:%p len:%d queue empty",
|
|
tp, &tp->t_segq, tp->t_segqmbuflen);
|
|
#else
|
|
#ifdef TCP_REASS_LOGGING
|
|
if (th != NULL) {
|
|
tcp_log_reassm(tp, NULL, NULL, th->th_seq, *tlenp, TCP_R_LOG_ZERO, 0);
|
|
} else {
|
|
tcp_log_reassm(tp, NULL, NULL, 0, 0, TCP_R_LOG_ZERO, 0);
|
|
}
|
|
#endif
|
|
tp->t_segqmbuflen = 0;
|
|
#endif
|
|
}
|
|
#ifdef TCP_REASS_LOGGING
|
|
tcp_reass_log_dump(tp);
|
|
#endif
|
|
tp->t_flags |= TF_WAKESOR;
|
|
return (flags);
|
|
}
|