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authorcvs2git <rtems-devel@rtems.org>1998-10-28 17:38:23 +0000
committercvs2git <rtems-devel@rtems.org>1998-10-28 17:38:23 +0000
commita6b6f0c130b613d7d807a772b8f85994d1c0d31e (patch)
tree6c40f2e9b0dd7672a271877203b92c0c211837bd /cpukit/libnetworking/netinet/tcp_input.c
parent3662240e9f84c596f7f15b6bfabb06890409d819 (diff)
This commit was manufactured by cvs2svn to create tag 'rtems-4-0-0'.4.0.0
Sprout from master 1998-10-28 17:38:22 UTC Joel Sherrill <joel.sherrill@OARcorp.com> 'changed version to 4.0.0' Delete: c/build-tools/README c/build-tools/cklength.c c/build-tools/eolstrip.c c/build-tools/install-if-change.in c/build-tools/lock-directory.in c/build-tools/packhex.c c/build-tools/rcs-clean.in c/build-tools/search-id.sh c/build-tools/unhex.c c/build-tools/unlock-directory.in c/src/ada-tests/mptests/mp01/config.h c/src/ada-tests/mptests/mp01/mp01.adb c/src/ada-tests/mptests/mp01/mptest.adb c/src/ada-tests/mptests/mp01/mptest.ads c/src/ada-tests/mptests/mp01/node1/mp01.scn c/src/ada-tests/mptests/mp01/node1/mptest-per_node_configuration.adb c/src/ada-tests/mptests/mp01/node2/mp01.scn c/src/ada-tests/mptests/mp01/node2/mptest-per_node_configuration.adb c/src/ada-tests/mptests/mp02/mptest.adb c/src/ada-tests/mptests/mp02/mptest.ads c/src/ada-tests/mptests/mp02/node1/mp02.scn c/src/ada-tests/mptests/mp02/node1/mptest-per_node_configuration.adb 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testsuites/sptests/sp07/trestart.c testsuites/sptests/sp07/tstart.c testsuites/sptests/sp08/init.c testsuites/sptests/sp08/sp08.doc testsuites/sptests/sp08/sp08.scn testsuites/sptests/sp08/system.h testsuites/sptests/sp08/task1.c testsuites/sptests/sp09/delay.c testsuites/sptests/sp09/init.c testsuites/sptests/sp09/isr.c testsuites/sptests/sp09/screen01.c testsuites/sptests/sp09/screen02.c testsuites/sptests/sp09/screen03.c testsuites/sptests/sp09/screen04.c testsuites/sptests/sp09/screen05.c testsuites/sptests/sp09/screen06.c testsuites/sptests/sp09/screen07.c testsuites/sptests/sp09/screen08.c testsuites/sptests/sp09/screen09.c testsuites/sptests/sp09/screen10.c testsuites/sptests/sp09/screen11.c testsuites/sptests/sp09/screen12.c testsuites/sptests/sp09/screen13.c testsuites/sptests/sp09/screen14.c testsuites/sptests/sp09/sp09.doc testsuites/sptests/sp09/sp09.scn testsuites/sptests/sp09/system.h testsuites/sptests/sp09/task1.c testsuites/sptests/sp09/task2.c testsuites/sptests/sp09/task3.c testsuites/sptests/sp09/task4.c testsuites/sptests/sp11/init.c testsuites/sptests/sp11/sp11.doc testsuites/sptests/sp11/sp11.scn testsuites/sptests/sp11/system.h testsuites/sptests/sp11/task1.c testsuites/sptests/sp11/task2.c testsuites/sptests/sp11/timer.c testsuites/sptests/sp12/init.c testsuites/sptests/sp12/pridrv.c testsuites/sptests/sp12/pritask.c testsuites/sptests/sp12/sp12.doc testsuites/sptests/sp12/sp12.scn testsuites/sptests/sp12/system.h testsuites/sptests/sp12/task1.c testsuites/sptests/sp12/task2.c testsuites/sptests/sp12/task3.c testsuites/sptests/sp12/task4.c testsuites/sptests/sp12/task5.c testsuites/sptests/sp13/fillbuff.c testsuites/sptests/sp13/init.c testsuites/sptests/sp13/putbuff.c testsuites/sptests/sp13/sp13.doc testsuites/sptests/sp13/sp13.scn testsuites/sptests/sp13/system.h testsuites/sptests/sp13/task1.c testsuites/sptests/sp13/task2.c testsuites/sptests/sp13/task3.c testsuites/sptests/sp14/asr.c 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testsuites/tmtests/tm13/system.h testsuites/tmtests/tm13/task1.c testsuites/tmtests/tm13/tm13.doc testsuites/tmtests/tm14/system.h testsuites/tmtests/tm14/task1.c testsuites/tmtests/tm14/tm14.doc testsuites/tmtests/tm15/system.h testsuites/tmtests/tm15/task1.c testsuites/tmtests/tm15/tm15.doc testsuites/tmtests/tm16/system.h testsuites/tmtests/tm16/task1.c testsuites/tmtests/tm16/tm16.doc testsuites/tmtests/tm17/system.h testsuites/tmtests/tm17/task1.c testsuites/tmtests/tm17/tm17.doc testsuites/tmtests/tm18/system.h testsuites/tmtests/tm18/task1.c testsuites/tmtests/tm18/tm18.doc testsuites/tmtests/tm19/system.h testsuites/tmtests/tm19/task1.c testsuites/tmtests/tm19/tm19.doc testsuites/tmtests/tm20/system.h testsuites/tmtests/tm20/task1.c testsuites/tmtests/tm20/tm20.doc testsuites/tmtests/tm21/system.h testsuites/tmtests/tm21/task1.c testsuites/tmtests/tm21/tm21.doc testsuites/tmtests/tm22/system.h testsuites/tmtests/tm22/task1.c testsuites/tmtests/tm22/tm22.doc testsuites/tmtests/tm23/system.h testsuites/tmtests/tm23/task1.c testsuites/tmtests/tm23/tm23.doc testsuites/tmtests/tm24/system.h testsuites/tmtests/tm24/task1.c testsuites/tmtests/tm24/tm24.doc testsuites/tmtests/tm25/system.h testsuites/tmtests/tm25/task1.c testsuites/tmtests/tm25/tm25.doc testsuites/tmtests/tm26/fptest.h testsuites/tmtests/tm26/system.h testsuites/tmtests/tm26/task1.c testsuites/tmtests/tm26/tm26.doc testsuites/tmtests/tm27/system.h testsuites/tmtests/tm27/task1.c testsuites/tmtests/tm27/tm27.doc testsuites/tmtests/tm28/system.h testsuites/tmtests/tm28/task1.c testsuites/tmtests/tm28/tm28.doc testsuites/tmtests/tm29/system.h testsuites/tmtests/tm29/task1.c testsuites/tmtests/tm29/tm29.doc testsuites/tmtests/tmck/system.h testsuites/tmtests/tmck/task1.c testsuites/tmtests/tmck/tmck.doc testsuites/tmtests/tmoverhd/dumrtems.h testsuites/tmtests/tmoverhd/empty.c testsuites/tmtests/tmoverhd/system.h testsuites/tmtests/tmoverhd/testtask.c testsuites/tmtests/tmoverhd/tmoverhd.doc tools/build/Makefile.in tools/build/README tools/build/binpatch.c tools/build/cklength.c tools/build/eolstrip.c tools/build/install-if-change.in tools/build/lock-directory.in tools/build/os/Makefile.in tools/build/os/msdos/Makefile.in tools/build/os/msdos/README tools/build/os/msdos/cklength.uue tools/build/os/msdos/fixtimer.c tools/build/os/msdos/fixtimer.uue tools/build/os/msdos/ifc.c tools/build/os/msdos/ifc_exe.uue tools/build/packhex.c tools/build/rcs-clean.in tools/build/scripts/Makefile.in tools/build/scripts/README tools/build/scripts/install-if-change.in tools/build/scripts/lock-directory.in tools/build/scripts/rcs-clean.in tools/build/scripts/search-id.sh tools/build/scripts/unlock-directory.in tools/build/search-id.sh tools/build/src/Makefile.in tools/build/src/cklength.c tools/build/src/config.h.in tools/build/src/eolstrip.c tools/build/src/packhex.c tools/build/src/unhex.c tools/build/unhex.c tools/build/unlock-directory.in tools/cpu/Makefile.in tools/cpu/generic/Makefile.in tools/cpu/generic/size_rtems.in tools/cpu/hppa1.1/genoffsets.c tools/cpu/sh/AUTHORS tools/cpu/sh/COPYING tools/cpu/sh/Makefile.in tools/cpu/sh/TODO tools/cpu/sh/sci.c tools/cpu/sh/sci.h tools/cpu/sh/shgen.c tools/cpu/unix/Makefile.in tools/cpu/unix/gensize.c tools/update/310_to_320_list tools/update/Makefile.in tools/update/README tools/update/update.in tools/update/word-replace.in
Diffstat (limited to 'cpukit/libnetworking/netinet/tcp_input.c')
-rw-r--r--cpukit/libnetworking/netinet/tcp_input.c2149
1 files changed, 0 insertions, 2149 deletions
diff --git a/cpukit/libnetworking/netinet/tcp_input.c b/cpukit/libnetworking/netinet/tcp_input.c
deleted file mode 100644
index bc55a79ae2..0000000000
--- a/cpukit/libnetworking/netinet/tcp_input.c
+++ /dev/null
@@ -1,2149 +0,0 @@
-/*
- * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1994, 1995
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. 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.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
- *
- * @(#)tcp_input.c 8.12 (Berkeley) 5/24/95
- * $Id$
- */
-
-#include "opt_tcpdebug.h"
-
-#ifndef TUBA_INCLUDE
-#include <sys/param.h>
-#include <sys/queue.h>
-#include <sys/systm.h>
-#include <sys/kernel.h>
-#include <sys/sysctl.h>
-#include <sys/malloc.h>
-#include <sys/mbuf.h>
-#include <sys/protosw.h>
-#include <sys/socket.h>
-#include <sys/socketvar.h>
-#include <sys/errno.h>
-#include <sys/syslog.h>
-
-#include <machine/cpu.h> /* before tcp_seq.h, for tcp_random18() */
-
-#include <net/if.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/ip_var.h>
-#include <netinet/tcp.h>
-#include <netinet/tcp_fsm.h>
-#include <netinet/tcp_seq.h>
-#include <netinet/tcp_timer.h>
-#include <netinet/tcp_var.h>
-#include <netinet/tcpip.h>
-#ifdef TCPDEBUG
-#include <netinet/tcp_debug.h>
-static struct tcpiphdr tcp_saveti;
-#endif
-
-static int tcprexmtthresh = 3;
-tcp_seq tcp_iss;
-tcp_cc tcp_ccgen;
-
-struct tcpstat tcpstat;
-SYSCTL_STRUCT(_net_inet_tcp, TCPCTL_STATS, stats,
- CTLFLAG_RD, &tcpstat , tcpstat, "");
-
-static int log_in_vain = 0;
-SYSCTL_INT(_net_inet_tcp, OID_AUTO, log_in_vain, CTLFLAG_RW,
- &log_in_vain, 0, "");
-
-u_long tcp_now;
-struct inpcbhead tcb;
-struct inpcbinfo tcbinfo;
-
-static void tcp_dooptions __P((struct tcpcb *,
- u_char *, int, struct tcpiphdr *, struct tcpopt *));
-static void tcp_pulloutofband __P((struct socket *,
- struct tcpiphdr *, struct mbuf *));
-static int tcp_reass __P((struct tcpcb *, struct tcpiphdr *, struct mbuf *));
-static void tcp_xmit_timer __P((struct tcpcb *, int));
-
-#endif /* TUBA_INCLUDE */
-
-/*
- * Insert segment ti into reassembly queue of tcp with
- * control block tp. Return TH_FIN if reassembly now includes
- * a segment with FIN. The macro form does the common case inline
- * (segment is the next to be received on an established connection,
- * and the queue is empty), avoiding linkage into and removal
- * from the queue and repetition of various conversions.
- * Set DELACK for segments received in order, but ack immediately
- * when segments are out of order (so fast retransmit can work).
- */
-#ifdef TCP_ACK_HACK
-#define TCP_REASS(tp, ti, m, so, flags) { \
- if ((ti)->ti_seq == (tp)->rcv_nxt && \
- (tp)->seg_next == (struct tcpiphdr *)(tp) && \
- (tp)->t_state == TCPS_ESTABLISHED) { \
- if (ti->ti_flags & TH_PUSH) \
- tp->t_flags |= TF_ACKNOW; \
- else \
- tp->t_flags |= TF_DELACK; \
- (tp)->rcv_nxt += (ti)->ti_len; \
- flags = (ti)->ti_flags & TH_FIN; \
- tcpstat.tcps_rcvpack++;\
- tcpstat.tcps_rcvbyte += (ti)->ti_len;\
- sbappend(&(so)->so_rcv, (m)); \
- sorwakeup(so); \
- } else { \
- (flags) = tcp_reass((tp), (ti), (m)); \
- tp->t_flags |= TF_ACKNOW; \
- } \
-}
-#else
-#define TCP_REASS(tp, ti, m, so, flags) { \
- if ((ti)->ti_seq == (tp)->rcv_nxt && \
- (tp)->seg_next == (struct tcpiphdr *)(tp) && \
- (tp)->t_state == TCPS_ESTABLISHED) { \
- tp->t_flags |= TF_DELACK; \
- (tp)->rcv_nxt += (ti)->ti_len; \
- flags = (ti)->ti_flags & TH_FIN; \
- tcpstat.tcps_rcvpack++;\
- tcpstat.tcps_rcvbyte += (ti)->ti_len;\
- sbappend(&(so)->so_rcv, (m)); \
- sorwakeup(so); \
- } else { \
- (flags) = tcp_reass((tp), (ti), (m)); \
- tp->t_flags |= TF_ACKNOW; \
- } \
-}
-#endif
-#ifndef TUBA_INCLUDE
-
-static int
-tcp_reass(tp, ti, m)
- register struct tcpcb *tp;
- register struct tcpiphdr *ti;
- struct mbuf *m;
-{
- register struct tcpiphdr *q;
- struct socket *so = tp->t_inpcb->inp_socket;
- int flags;
-
- /*
- * Call with ti==0 after become established to
- * force pre-ESTABLISHED data up to user socket.
- */
- if (ti == 0)
- goto present;
-
- /*
- * Find a segment which begins after this one does.
- */
- for (q = tp->seg_next; q != (struct tcpiphdr *)tp;
- q = (struct tcpiphdr *)q->ti_next)
- if (SEQ_GT(q->ti_seq, ti->ti_seq))
- break;
-
- /*
- * If there is a preceding segment, it may provide some of
- * our data already. If so, drop the data from the incoming
- * segment. If it provides all of our data, drop us.
- */
- if ((struct tcpiphdr *)q->ti_prev != (struct tcpiphdr *)tp) {
- register int i;
- q = (struct tcpiphdr *)q->ti_prev;
- /* conversion to int (in i) handles seq wraparound */
- i = q->ti_seq + q->ti_len - ti->ti_seq;
- if (i > 0) {
- if (i >= ti->ti_len) {
- tcpstat.tcps_rcvduppack++;
- tcpstat.tcps_rcvdupbyte += ti->ti_len;
- 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.
- */
- goto present; /* ??? */
- }
- m_adj(m, i);
- ti->ti_len -= i;
- ti->ti_seq += i;
- }
- q = (struct tcpiphdr *)(q->ti_next);
- }
- tcpstat.tcps_rcvoopack++;
- tcpstat.tcps_rcvoobyte += ti->ti_len;
- REASS_MBUF(ti) = m; /* XXX */
-
- /*
- * While we overlap succeeding segments trim them or,
- * if they are completely covered, dequeue them.
- */
- while (q != (struct tcpiphdr *)tp) {
- register int i = (ti->ti_seq + ti->ti_len) - q->ti_seq;
- if (i <= 0)
- break;
- if (i < q->ti_len) {
- q->ti_seq += i;
- q->ti_len -= i;
- m_adj(REASS_MBUF(q), i);
- break;
- }
- q = (struct tcpiphdr *)q->ti_next;
- m = REASS_MBUF((struct tcpiphdr *)q->ti_prev);
- remque(q->ti_prev);
- m_freem(m);
- }
-
- /*
- * Stick new segment in its place.
- */
- insque(ti, q->ti_prev);
-
-present:
- /*
- * Present data to user, advancing rcv_nxt through
- * completed sequence space.
- */
- if (!TCPS_HAVEESTABLISHED(tp->t_state))
- return (0);
- ti = tp->seg_next;
- if (ti == (struct tcpiphdr *)tp || ti->ti_seq != tp->rcv_nxt)
- return (0);
- do {
- tp->rcv_nxt += ti->ti_len;
- flags = ti->ti_flags & TH_FIN;
- remque(ti);
- m = REASS_MBUF(ti);
- ti = (struct tcpiphdr *)ti->ti_next;
- if (so->so_state & SS_CANTRCVMORE)
- m_freem(m);
- else
- sbappend(&so->so_rcv, m);
- } while (ti != (struct tcpiphdr *)tp && ti->ti_seq == tp->rcv_nxt);
- sorwakeup(so);
- return (flags);
-}
-
-/*
- * TCP input routine, follows pages 65-76 of the
- * protocol specification dated September, 1981 very closely.
- */
-void
-tcp_input(m, iphlen)
- register struct mbuf *m;
- int iphlen;
-{
- register struct tcpiphdr *ti;
- register struct inpcb *inp;
- u_char *optp = NULL;
- int optlen = 0;
- int len, tlen, off;
- register struct tcpcb *tp = 0;
- register int tiflags;
- struct socket *so = 0;
- int todrop, acked, ourfinisacked, needoutput = 0;
- struct in_addr laddr;
- int dropsocket = 0;
- int iss = 0;
- u_long tiwin;
- struct tcpopt to; /* options in this segment */
- struct rmxp_tao *taop; /* pointer to our TAO cache entry */
- struct rmxp_tao tao_noncached; /* in case there's no cached entry */
-#ifdef TCPDEBUG
- short ostate = 0;
-#endif
-
- bzero((char *)&to, sizeof(to));
-
- tcpstat.tcps_rcvtotal++;
- /*
- * Get IP and TCP header together in first mbuf.
- * Note: IP leaves IP header in first mbuf.
- */
- ti = mtod(m, struct tcpiphdr *);
- if (iphlen > sizeof (struct ip))
- ip_stripoptions(m, (struct mbuf *)0);
- if (m->m_len < sizeof (struct tcpiphdr)) {
- if ((m = m_pullup(m, sizeof (struct tcpiphdr))) == 0) {
- tcpstat.tcps_rcvshort++;
- return;
- }
- ti = mtod(m, struct tcpiphdr *);
- }
-
- /*
- * Checksum extended TCP header and data.
- */
- tlen = ((struct ip *)ti)->ip_len;
- len = sizeof (struct ip) + tlen;
- ti->ti_next = ti->ti_prev = 0;
- ti->ti_x1 = 0;
- ti->ti_len = (u_short)tlen;
- HTONS(ti->ti_len);
- ti->ti_sum = in_cksum(m, len);
- if (ti->ti_sum) {
- tcpstat.tcps_rcvbadsum++;
- goto drop;
- }
-#endif /* TUBA_INCLUDE */
-
- /*
- * Check that TCP offset makes sense,
- * pull out TCP options and adjust length. XXX
- */
- off = ti->ti_off << 2;
- if (off < sizeof (struct tcphdr) || off > tlen) {
- tcpstat.tcps_rcvbadoff++;
- goto drop;
- }
- tlen -= off;
- ti->ti_len = tlen;
- if (off > sizeof (struct tcphdr)) {
- if (m->m_len < sizeof(struct ip) + off) {
- if ((m = m_pullup(m, sizeof (struct ip) + off)) == 0) {
- tcpstat.tcps_rcvshort++;
- return;
- }
- ti = mtod(m, struct tcpiphdr *);
- }
- optlen = off - sizeof (struct tcphdr);
- optp = mtod(m, u_char *) + sizeof (struct tcpiphdr);
- }
- tiflags = ti->ti_flags;
-
- /*
- * Convert TCP protocol specific fields to host format.
- */
- NTOHL(ti->ti_seq);
- NTOHL(ti->ti_ack);
- NTOHS(ti->ti_win);
- NTOHS(ti->ti_urp);
-
- /*
- * Drop TCP, IP headers and TCP options.
- */
- m->m_data += sizeof(struct tcpiphdr)+off-sizeof(struct tcphdr);
- m->m_len -= sizeof(struct tcpiphdr)+off-sizeof(struct tcphdr);
-
- /*
- * Locate pcb for segment.
- */
-findpcb:
- inp = in_pcblookuphash(&tcbinfo, ti->ti_src, ti->ti_sport,
- ti->ti_dst, ti->ti_dport, 1);
-
- /*
- * If the state is CLOSED (i.e., TCB does not exist) then
- * all data in the incoming segment is discarded.
- * If the TCB exists but is in CLOSED state, it is embryonic,
- * but should either do a listen or a connect soon.
- */
- if (inp == NULL) {
- if (log_in_vain && tiflags & TH_SYN) {
- char buf[4*sizeof "123"];
-
- strcpy(buf, inet_ntoa(ti->ti_dst));
- log(LOG_INFO, "Connection attempt to TCP %s:%d"
- " from %s:%d\n",
- buf, ntohs(ti->ti_dport),
- inet_ntoa(ti->ti_src), ntohs(ti->ti_sport));
- }
- goto dropwithreset;
- }
- tp = intotcpcb(inp);
- if (tp == 0)
- goto dropwithreset;
- if (tp->t_state == TCPS_CLOSED)
- goto drop;
-
- /* Unscale the window into a 32-bit value. */
- if ((tiflags & TH_SYN) == 0)
- tiwin = ti->ti_win << tp->snd_scale;
- else
- tiwin = ti->ti_win;
-
- so = inp->inp_socket;
- if (so->so_options & (SO_DEBUG|SO_ACCEPTCONN)) {
-#ifdef TCPDEBUG
- if (so->so_options & SO_DEBUG) {
- ostate = tp->t_state;
- tcp_saveti = *ti;
- }
-#endif
- if (so->so_options & SO_ACCEPTCONN) {
- register struct tcpcb *tp0 = tp;
- struct socket *so2;
- if ((tiflags & (TH_RST|TH_ACK|TH_SYN)) != TH_SYN) {
- /*
- * Note: dropwithreset makes sure we don't
- * send a RST in response to a RST.
- */
- if (tiflags & TH_ACK) {
- tcpstat.tcps_badsyn++;
- goto dropwithreset;
- }
- goto drop;
- }
- so2 = sonewconn(so, 0);
- if (so2 == 0) {
- tcpstat.tcps_listendrop++;
- so2 = sodropablereq(so);
- if (so2) {
- tcp_drop(sototcpcb(so2), ETIMEDOUT);
- so2 = sonewconn(so, 0);
- }
- if (!so2)
- goto drop;
- }
- so = so2;
- /*
- * This is ugly, but ....
- *
- * Mark socket as temporary until we're
- * committed to keeping it. The code at
- * ``drop'' and ``dropwithreset'' check the
- * flag dropsocket to see if the temporary
- * socket created here should be discarded.
- * We mark the socket as discardable until
- * we're committed to it below in TCPS_LISTEN.
- */
- dropsocket++;
- inp = (struct inpcb *)so->so_pcb;
- inp->inp_laddr = ti->ti_dst;
- inp->inp_lport = ti->ti_dport;
- in_pcbrehash(inp);
-#if BSD>=43
- inp->inp_options = ip_srcroute();
-#endif
- tp = intotcpcb(inp);
- tp->t_state = TCPS_LISTEN;
- tp->t_flags |= tp0->t_flags & (TF_NOPUSH|TF_NOOPT);
-
- /* Compute proper scaling value from buffer space */
- while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
- TCP_MAXWIN << tp->request_r_scale < so->so_rcv.sb_hiwat)
- tp->request_r_scale++;
- }
- }
-
- /*
- * Segment received on connection.
- * Reset idle time and keep-alive timer.
- */
- tp->t_idle = 0;
- if (TCPS_HAVEESTABLISHED(tp->t_state))
- tp->t_timer[TCPT_KEEP] = tcp_keepidle;
-
- /*
- * Process options if not in LISTEN state,
- * else do it below (after getting remote address).
- */
- if (tp->t_state != TCPS_LISTEN)
- tcp_dooptions(tp, optp, optlen, ti, &to);
-
- /*
- * Header prediction: check for the two common cases
- * of a uni-directional data xfer. If the packet has
- * no control flags, is in-sequence, the window didn't
- * change and we're not retransmitting, it's a
- * candidate. If the length is zero and the ack moved
- * forward, we're the sender side of the xfer. Just
- * free the data acked & wake any higher level process
- * that was blocked waiting for space. If the length
- * is non-zero and the ack didn't move, we're the
- * receiver side. If we're getting packets in-order
- * (the reassembly queue is empty), add the data to
- * the socket buffer and note that we need a delayed ack.
- * Make sure that the hidden state-flags are also off.
- * Since we check for TCPS_ESTABLISHED above, it can only
- * be TH_NEEDSYN.
- */
- if (tp->t_state == TCPS_ESTABLISHED &&
- (tiflags & (TH_SYN|TH_FIN|TH_RST|TH_URG|TH_ACK)) == TH_ACK &&
- ((tp->t_flags & (TF_NEEDSYN|TF_NEEDFIN)) == 0) &&
- ((to.to_flag & TOF_TS) == 0 ||
- TSTMP_GEQ(to.to_tsval, tp->ts_recent)) &&
- /*
- * Using the CC option is compulsory if once started:
- * the segment is OK if no T/TCP was negotiated or
- * if the segment has a CC option equal to CCrecv
- */
- ((tp->t_flags & (TF_REQ_CC|TF_RCVD_CC)) != (TF_REQ_CC|TF_RCVD_CC) ||
- ((to.to_flag & TOF_CC) != 0 && to.to_cc == tp->cc_recv)) &&
- ti->ti_seq == tp->rcv_nxt &&
- tiwin && tiwin == tp->snd_wnd &&
- tp->snd_nxt == tp->snd_max) {
-
- /*
- * If last ACK falls within this segment's sequence numbers,
- * record the timestamp.
- * NOTE that the test is modified according to the latest
- * proposal of the tcplw@cray.com list (Braden 1993/04/26).
- */
- if ((to.to_flag & TOF_TS) != 0 &&
- SEQ_LEQ(ti->ti_seq, tp->last_ack_sent)) {
- tp->ts_recent_age = tcp_now;
- tp->ts_recent = to.to_tsval;
- }
-
- if (ti->ti_len == 0) {
- if (SEQ_GT(ti->ti_ack, tp->snd_una) &&
- SEQ_LEQ(ti->ti_ack, tp->snd_max) &&
- tp->snd_cwnd >= tp->snd_wnd &&
- tp->t_dupacks < tcprexmtthresh) {
- /*
- * this is a pure ack for outstanding data.
- */
- ++tcpstat.tcps_predack;
- if ((to.to_flag & TOF_TS) != 0)
- tcp_xmit_timer(tp,
- tcp_now - to.to_tsecr + 1);
- else if (tp->t_rtt &&
- SEQ_GT(ti->ti_ack, tp->t_rtseq))
- tcp_xmit_timer(tp, tp->t_rtt);
- acked = ti->ti_ack - tp->snd_una;
- tcpstat.tcps_rcvackpack++;
- tcpstat.tcps_rcvackbyte += acked;
- sbdrop(&so->so_snd, acked);
- tp->snd_una = ti->ti_ack;
- m_freem(m);
-
- /*
- * If all outstanding data are acked, stop
- * retransmit timer, otherwise restart timer
- * using current (possibly backed-off) value.
- * If process is waiting for space,
- * wakeup/selwakeup/signal. If data
- * are ready to send, let tcp_output
- * decide between more output or persist.
- */
- if (tp->snd_una == tp->snd_max)
- tp->t_timer[TCPT_REXMT] = 0;
- else if (tp->t_timer[TCPT_PERSIST] == 0)
- tp->t_timer[TCPT_REXMT] = tp->t_rxtcur;
-
- if (so->so_snd.sb_flags & SB_NOTIFY)
- sowwakeup(so);
- if (so->so_snd.sb_cc)
- (void) tcp_output(tp);
- return;
- }
- } else if (ti->ti_ack == tp->snd_una &&
- tp->seg_next == (struct tcpiphdr *)tp &&
- ti->ti_len <= sbspace(&so->so_rcv)) {
- /*
- * this is a pure, in-sequence data packet
- * with nothing on the reassembly queue and
- * we have enough buffer space to take it.
- */
- ++tcpstat.tcps_preddat;
- tp->rcv_nxt += ti->ti_len;
- tcpstat.tcps_rcvpack++;
- tcpstat.tcps_rcvbyte += ti->ti_len;
- /*
- * Add data to socket buffer.
- */
- sbappend(&so->so_rcv, m);
- sorwakeup(so);
-#ifdef TCP_ACK_HACK
- /*
- * If this is a short packet, then ACK now - with Nagel
- * congestion avoidance sender won't send more until
- * he gets an ACK.
- */
- if (tiflags & TH_PUSH) {
- tp->t_flags |= TF_ACKNOW;
- tcp_output(tp);
- } else {
- tp->t_flags |= TF_DELACK;
- }
-#else
- tp->t_flags |= TF_DELACK;
-#endif
- return;
- }
- }
-
- /*
- * Calculate amount of space in receive window,
- * and then do TCP input processing.
- * Receive window is amount of space in rcv queue,
- * but not less than advertised window.
- */
- { int win;
-
- win = sbspace(&so->so_rcv);
- if (win < 0)
- win = 0;
- tp->rcv_wnd = imax(win, (int)(tp->rcv_adv - tp->rcv_nxt));
- }
-
- switch (tp->t_state) {
-
- /*
- * If the state is LISTEN then ignore segment if it contains an RST.
- * If the segment contains an ACK then it is bad and send a RST.
- * If it does not contain a SYN then it is not interesting; drop it.
- * If it is from this socket, drop it, it must be forged.
- * Don't bother responding if the destination was a broadcast.
- * Otherwise initialize tp->rcv_nxt, and tp->irs, select an initial
- * tp->iss, and send a segment:
- * <SEQ=ISS><ACK=RCV_NXT><CTL=SYN,ACK>
- * Also initialize tp->snd_nxt to tp->iss+1 and tp->snd_una to tp->iss.
- * Fill in remote peer address fields if not previously specified.
- * Enter SYN_RECEIVED state, and process any other fields of this
- * segment in this state.
- */
- case TCPS_LISTEN: {
- struct mbuf *am;
- register struct sockaddr_in *sin;
-
- if (tiflags & TH_RST)
- goto drop;
- if (tiflags & TH_ACK)
- goto dropwithreset;
- if ((tiflags & TH_SYN) == 0)
- goto drop;
- if ((ti->ti_dport == ti->ti_sport) &&
- (ti->ti_dst.s_addr == ti->ti_src.s_addr))
- goto drop;
- /*
- * RFC1122 4.2.3.10, p. 104: discard bcast/mcast SYN
- * in_broadcast() should never return true on a received
- * packet with M_BCAST not set.
- */
- if (m->m_flags & (M_BCAST|M_MCAST) ||
- IN_MULTICAST(ntohl(ti->ti_dst.s_addr)))
- goto drop;
- am = m_get(M_DONTWAIT, MT_SONAME); /* XXX */
- if (am == NULL)
- goto drop;
- am->m_len = sizeof (struct sockaddr_in);
- sin = mtod(am, struct sockaddr_in *);
- sin->sin_family = AF_INET;
- sin->sin_len = sizeof(*sin);
- sin->sin_addr = ti->ti_src;
- sin->sin_port = ti->ti_sport;
- bzero((caddr_t)sin->sin_zero, sizeof(sin->sin_zero));
- laddr = inp->inp_laddr;
- if (inp->inp_laddr.s_addr == INADDR_ANY)
- inp->inp_laddr = ti->ti_dst;
- if (in_pcbconnect(inp, am)) {
- inp->inp_laddr = laddr;
- (void) m_free(am);
- goto drop;
- }
- (void) m_free(am);
- tp->t_template = tcp_template(tp);
- if (tp->t_template == 0) {
- tp = tcp_drop(tp, ENOBUFS);
- dropsocket = 0; /* socket is already gone */
- goto drop;
- }
- if ((taop = tcp_gettaocache(inp)) == NULL) {
- taop = &tao_noncached;
- bzero(taop, sizeof(*taop));
- }
- tcp_dooptions(tp, optp, optlen, ti, &to);
- if (iss)
- tp->iss = iss;
- else
- tp->iss = tcp_iss;
- tcp_iss += TCP_ISSINCR/4;
- tp->irs = ti->ti_seq;
- tcp_sendseqinit(tp);
- tcp_rcvseqinit(tp);
- /*
- * Initialization of the tcpcb for transaction;
- * set SND.WND = SEG.WND,
- * initialize CCsend and CCrecv.
- */
- tp->snd_wnd = tiwin; /* initial send-window */
- tp->cc_send = CC_INC(tcp_ccgen);
- tp->cc_recv = to.to_cc;
- /*
- * Perform TAO test on incoming CC (SEG.CC) option, if any.
- * - compare SEG.CC against cached CC from the same host,
- * if any.
- * - if SEG.CC > chached value, SYN must be new and is accepted
- * immediately: save new CC in the cache, mark the socket
- * connected, enter ESTABLISHED state, turn on flag to
- * send a SYN in the next segment.
- * A virtual advertised window is set in rcv_adv to
- * initialize SWS prevention. Then enter normal segment
- * processing: drop SYN, process data and FIN.
- * - otherwise do a normal 3-way handshake.
- */
- if ((to.to_flag & TOF_CC) != 0) {
- if (taop->tao_cc != 0 && CC_GT(to.to_cc, taop->tao_cc)) {
- taop->tao_cc = to.to_cc;
- tp->t_state = TCPS_ESTABLISHED;
-
- /*
- * If there is a FIN, or if there is data and the
- * connection is local, then delay SYN,ACK(SYN) in
- * the hope of piggy-backing it on a response
- * segment. Otherwise must send ACK now in case
- * the other side is slow starting.
- */
- if ((tiflags & TH_FIN) || (ti->ti_len != 0 &&
- in_localaddr(inp->inp_faddr)))
- tp->t_flags |= (TF_DELACK | TF_NEEDSYN);
- else
- tp->t_flags |= (TF_ACKNOW | TF_NEEDSYN);
-
- /*
- * Limit the `virtual advertised window' to TCP_MAXWIN
- * here. Even if we requested window scaling, it will
- * become effective only later when our SYN is acked.
- */
- tp->rcv_adv += min(tp->rcv_wnd, TCP_MAXWIN);
- tcpstat.tcps_connects++;
- soisconnected(so);
- tp->t_timer[TCPT_KEEP] = tcp_keepinit;
- dropsocket = 0; /* committed to socket */
- tcpstat.tcps_accepts++;
- goto trimthenstep6;
- }
- /* else do standard 3-way handshake */
- } else {
- /*
- * No CC option, but maybe CC.NEW:
- * invalidate cached value.
- */
- taop->tao_cc = 0;
- }
- /*
- * TAO test failed or there was no CC option,
- * do a standard 3-way handshake.
- */
- tp->t_flags |= TF_ACKNOW;
- tp->t_state = TCPS_SYN_RECEIVED;
- tp->t_timer[TCPT_KEEP] = tcp_keepinit;
- dropsocket = 0; /* committed to socket */
- tcpstat.tcps_accepts++;
- goto trimthenstep6;
- }
-
- /*
- * If the state is SYN_RECEIVED:
- * if seg contains SYN/ACK, send a RST.
- * if seg contains an ACK, but not for our SYN/ACK, send a RST.
- */
- case TCPS_SYN_RECEIVED:
- if (tiflags & TH_ACK) {
- if (tiflags & TH_SYN) {
- tcpstat.tcps_badsyn++;
- goto dropwithreset;
- }
- if (SEQ_LEQ(ti->ti_ack, tp->snd_una) ||
- SEQ_GT(ti->ti_ack, tp->snd_max))
- goto dropwithreset;
- }
- break;
-
- /*
- * If the state is SYN_SENT:
- * if seg contains an ACK, but not for our SYN, drop the input.
- * if seg contains a RST, then drop the connection.
- * if seg does not contain SYN, then drop it.
- * Otherwise this is an acceptable SYN segment
- * initialize tp->rcv_nxt and tp->irs
- * if seg contains ack then advance tp->snd_una
- * if SYN has been acked change to ESTABLISHED else SYN_RCVD state
- * arrange for segment to be acked (eventually)
- * continue processing rest of data/controls, beginning with URG
- */
- case TCPS_SYN_SENT:
- if ((taop = tcp_gettaocache(inp)) == NULL) {
- taop = &tao_noncached;
- bzero(taop, sizeof(*taop));
- }
-
- if ((tiflags & TH_ACK) &&
- (SEQ_LEQ(ti->ti_ack, tp->iss) ||
- SEQ_GT(ti->ti_ack, tp->snd_max))) {
- /*
- * If we have a cached CCsent for the remote host,
- * hence we haven't just crashed and restarted,
- * do not send a RST. This may be a retransmission
- * from the other side after our earlier ACK was lost.
- * Our new SYN, when it arrives, will serve as the
- * needed ACK.
- */
- if (taop->tao_ccsent != 0)
- goto drop;
- else
- goto dropwithreset;
- }
- if (tiflags & TH_RST) {
- if (tiflags & TH_ACK)
- tp = tcp_drop(tp, ECONNREFUSED);
- goto drop;
- }
- if ((tiflags & TH_SYN) == 0)
- goto drop;
- tp->snd_wnd = ti->ti_win; /* initial send window */
- tp->cc_recv = to.to_cc; /* foreign CC */
-
- tp->irs = ti->ti_seq;
- tcp_rcvseqinit(tp);
- if (tiflags & TH_ACK) {
- /*
- * Our SYN was acked. If segment contains CC.ECHO
- * option, check it to make sure this segment really
- * matches our SYN. If not, just drop it as old
- * duplicate, but send an RST if we're still playing
- * by the old rules. If no CC.ECHO option, make sure
- * we don't get fooled into using T/TCP.
- */
- if (to.to_flag & TOF_CCECHO) {
- if (tp->cc_send != to.to_ccecho)
- if (taop->tao_ccsent != 0)
- goto drop;
- else
- goto dropwithreset;
- } else
- tp->t_flags &= ~TF_RCVD_CC;
- tcpstat.tcps_connects++;
- soisconnected(so);
- /* Do window scaling on this connection? */
- if ((tp->t_flags & (TF_RCVD_SCALE|TF_REQ_SCALE)) ==
- (TF_RCVD_SCALE|TF_REQ_SCALE)) {
- tp->snd_scale = tp->requested_s_scale;
- tp->rcv_scale = tp->request_r_scale;
- }
- /* Segment is acceptable, update cache if undefined. */
- if (taop->tao_ccsent == 0)
- taop->tao_ccsent = to.to_ccecho;
-
- tp->rcv_adv += tp->rcv_wnd;
- tp->snd_una++; /* SYN is acked */
- /*
- * If there's data, delay ACK; if there's also a FIN
- * ACKNOW will be turned on later.
- */
- if (ti->ti_len != 0)
- tp->t_flags |= TF_DELACK;
- else
- tp->t_flags |= TF_ACKNOW;
- /*
- * Received <SYN,ACK> in SYN_SENT[*] state.
- * Transitions:
- * SYN_SENT --> ESTABLISHED
- * SYN_SENT* --> FIN_WAIT_1
- */
- if (tp->t_flags & TF_NEEDFIN) {
- tp->t_state = TCPS_FIN_WAIT_1;
- tp->t_flags &= ~TF_NEEDFIN;
- tiflags &= ~TH_SYN;
- } else {
- tp->t_state = TCPS_ESTABLISHED;
- tp->t_timer[TCPT_KEEP] = tcp_keepidle;
- }
- } else {
- /*
- * Received initial SYN in SYN-SENT[*] state => simul-
- * taneous open. If segment contains CC option and there is
- * a cached CC, apply TAO test; if it succeeds, connection is
- * half-synchronized. Otherwise, do 3-way handshake:
- * SYN-SENT -> SYN-RECEIVED
- * SYN-SENT* -> SYN-RECEIVED*
- * If there was no CC option, clear cached CC value.
- */
- tp->t_flags |= TF_ACKNOW;
- tp->t_timer[TCPT_REXMT] = 0;
- if (to.to_flag & TOF_CC) {
- if (taop->tao_cc != 0 &&
- CC_GT(to.to_cc, taop->tao_cc)) {
- /*
- * update cache and make transition:
- * SYN-SENT -> ESTABLISHED*
- * SYN-SENT* -> FIN-WAIT-1*
- */
- taop->tao_cc = to.to_cc;
- if (tp->t_flags & TF_NEEDFIN) {
- tp->t_state = TCPS_FIN_WAIT_1;
- tp->t_flags &= ~TF_NEEDFIN;
- } else {
- tp->t_state = TCPS_ESTABLISHED;
- tp->t_timer[TCPT_KEEP] = tcp_keepidle;
- }
- tp->t_flags |= TF_NEEDSYN;
- } else
- tp->t_state = TCPS_SYN_RECEIVED;
- } else {
- /* CC.NEW or no option => invalidate cache */
- taop->tao_cc = 0;
- tp->t_state = TCPS_SYN_RECEIVED;
- }
- }
-
-trimthenstep6:
- /*
- * Advance ti->ti_seq to correspond to first data byte.
- * If data, trim to stay within window,
- * dropping FIN if necessary.
- */
- ti->ti_seq++;
- if (ti->ti_len > tp->rcv_wnd) {
- todrop = ti->ti_len - tp->rcv_wnd;
- m_adj(m, -todrop);
- ti->ti_len = tp->rcv_wnd;
- tiflags &= ~TH_FIN;
- tcpstat.tcps_rcvpackafterwin++;
- tcpstat.tcps_rcvbyteafterwin += todrop;
- }
- tp->snd_wl1 = ti->ti_seq - 1;
- tp->rcv_up = ti->ti_seq;
- /*
- * Client side of transaction: already sent SYN and data.
- * If the remote host used T/TCP to validate the SYN,
- * our data will be ACK'd; if so, enter normal data segment
- * processing in the middle of step 5, ack processing.
- * Otherwise, goto step 6.
- */
- if (tiflags & TH_ACK)
- goto process_ACK;
- goto step6;
- /*
- * If the state is LAST_ACK or CLOSING or TIME_WAIT:
- * if segment contains a SYN and CC [not CC.NEW] option:
- * if state == TIME_WAIT and connection duration > MSL,
- * drop packet and send RST;
- *
- * if SEG.CC > CCrecv then is new SYN, and can implicitly
- * ack the FIN (and data) in retransmission queue.
- * Complete close and delete TCPCB. Then reprocess
- * segment, hoping to find new TCPCB in LISTEN state;
- *
- * else must be old SYN; drop it.
- * else do normal processing.
- */
- case TCPS_LAST_ACK:
- case TCPS_CLOSING:
- case TCPS_TIME_WAIT:
- if ((tiflags & TH_SYN) &&
- (to.to_flag & TOF_CC) && tp->cc_recv != 0) {
- if (tp->t_state == TCPS_TIME_WAIT &&
- tp->t_duration > TCPTV_MSL)
- goto dropwithreset;
- if (CC_GT(to.to_cc, tp->cc_recv)) {
- tp = tcp_close(tp);
- goto findpcb;
- }
- else
- goto drop;
- }
- break; /* continue normal processing */
- }
-
- /*
- * States other than LISTEN or SYN_SENT.
- * First check timestamp, if present.
- * Then check the connection count, if present.
- * Then check that at least some bytes of segment are within
- * receive window. If segment begins before rcv_nxt,
- * drop leading data (and SYN); if nothing left, just ack.
- *
- * RFC 1323 PAWS: If we have a timestamp reply on this segment
- * and it's less than ts_recent, drop it.
- */
- if ((to.to_flag & TOF_TS) != 0 && (tiflags & TH_RST) == 0 &&
- tp->ts_recent && TSTMP_LT(to.to_tsval, tp->ts_recent)) {
-
- /* Check to see if ts_recent is over 24 days old. */
- if ((int)(tcp_now - tp->ts_recent_age) > TCP_PAWS_IDLE) {
- /*
- * Invalidate ts_recent. If this segment updates
- * ts_recent, the age will be reset later and ts_recent
- * will get a valid value. If it does not, setting
- * ts_recent to zero will at least satisfy the
- * requirement that zero be placed in the timestamp
- * echo reply when ts_recent isn't valid. The
- * age isn't reset until we get a valid ts_recent
- * because we don't want out-of-order segments to be
- * dropped when ts_recent is old.
- */
- tp->ts_recent = 0;
- } else {
- tcpstat.tcps_rcvduppack++;
- tcpstat.tcps_rcvdupbyte += ti->ti_len;
- tcpstat.tcps_pawsdrop++;
- goto dropafterack;
- }
- }
-
- /*
- * T/TCP mechanism
- * If T/TCP was negotiated and the segment doesn't have CC,
- * or if it's CC is wrong then drop the segment.
- * RST segments do not have to comply with this.
- */
- if ((tp->t_flags & (TF_REQ_CC|TF_RCVD_CC)) == (TF_REQ_CC|TF_RCVD_CC) &&
- ((to.to_flag & TOF_CC) == 0 || tp->cc_recv != to.to_cc) &&
- (tiflags & TH_RST) == 0)
- goto dropafterack;
-
- todrop = tp->rcv_nxt - ti->ti_seq;
- if (todrop > 0) {
- if (tiflags & TH_SYN) {
- tiflags &= ~TH_SYN;
- ti->ti_seq++;
- if (ti->ti_urp > 1)
- ti->ti_urp--;
- else
- tiflags &= ~TH_URG;
- todrop--;
- }
- /*
- * Following if statement from Stevens, vol. 2, p. 960.
- */
- if (todrop > ti->ti_len
- || (todrop == ti->ti_len && (tiflags & TH_FIN) == 0)) {
- /*
- * Any valid FIN must be to the left of the window.
- * At this point the FIN must be a duplicate or out
- * of sequence; drop it.
- */
- tiflags &= ~TH_FIN;
-
- /*
- * Send an ACK to resynchronize and drop any data.
- * But keep on processing for RST or ACK.
- */
- tp->t_flags |= TF_ACKNOW;
- todrop = ti->ti_len;
- tcpstat.tcps_rcvduppack++;
- tcpstat.tcps_rcvdupbyte += todrop;
- } else {
- tcpstat.tcps_rcvpartduppack++;
- tcpstat.tcps_rcvpartdupbyte += todrop;
- }
- m_adj(m, todrop);
- ti->ti_seq += todrop;
- ti->ti_len -= todrop;
- if (ti->ti_urp > todrop)
- ti->ti_urp -= todrop;
- else {
- tiflags &= ~TH_URG;
- ti->ti_urp = 0;
- }
- }
-
- /*
- * If new data are received on a connection after the
- * user processes are gone, then RST the other end.
- */
- if ((so->so_state & SS_NOFDREF) &&
- tp->t_state > TCPS_CLOSE_WAIT && ti->ti_len) {
- tp = tcp_close(tp);
- tcpstat.tcps_rcvafterclose++;
- goto dropwithreset;
- }
-
- /*
- * If segment ends after window, drop trailing data
- * (and PUSH and FIN); if nothing left, just ACK.
- */
- todrop = (ti->ti_seq+ti->ti_len) - (tp->rcv_nxt+tp->rcv_wnd);
- if (todrop > 0) {
- tcpstat.tcps_rcvpackafterwin++;
- if (todrop >= ti->ti_len) {
- tcpstat.tcps_rcvbyteafterwin += ti->ti_len;
- /*
- * If a new connection request is received
- * while in TIME_WAIT, drop the old connection
- * and start over if the sequence numbers
- * are above the previous ones.
- */
- if (tiflags & TH_SYN &&
- tp->t_state == TCPS_TIME_WAIT &&
- SEQ_GT(ti->ti_seq, tp->rcv_nxt)) {
- iss = tp->rcv_nxt + TCP_ISSINCR;
- tp = tcp_close(tp);
- goto findpcb;
- }
- /*
- * If window is closed can only take segments at
- * window edge, and have to drop data and PUSH from
- * incoming segments. Continue processing, but
- * remember to ack. Otherwise, drop segment
- * and ack.
- */
- if (tp->rcv_wnd == 0 && ti->ti_seq == tp->rcv_nxt) {
- tp->t_flags |= TF_ACKNOW;
- tcpstat.tcps_rcvwinprobe++;
- } else
- goto dropafterack;
- } else
- tcpstat.tcps_rcvbyteafterwin += todrop;
- m_adj(m, -todrop);
- ti->ti_len -= todrop;
- tiflags &= ~(TH_PUSH|TH_FIN);
- }
-
- /*
- * If last ACK falls within this segment's sequence numbers,
- * record its timestamp.
- * NOTE that the test is modified according to the latest
- * proposal of the tcplw@cray.com list (Braden 1993/04/26).
- */
- if ((to.to_flag & TOF_TS) != 0 &&
- SEQ_LEQ(ti->ti_seq, tp->last_ack_sent)) {
- tp->ts_recent_age = tcp_now;
- tp->ts_recent = to.to_tsval;
- }
-
- /*
- * If the RST bit is set examine the state:
- * SYN_RECEIVED STATE:
- * If passive open, return to LISTEN state.
- * If active open, inform user that connection was refused.
- * ESTABLISHED, FIN_WAIT_1, FIN_WAIT2, CLOSE_WAIT STATES:
- * Inform user that connection was reset, and close tcb.
- * CLOSING, LAST_ACK, TIME_WAIT STATES
- * Close the tcb.
- */
- if (tiflags&TH_RST) switch (tp->t_state) {
-
- case TCPS_SYN_RECEIVED:
- so->so_error = ECONNREFUSED;
- goto close;
-
- case TCPS_ESTABLISHED:
- case TCPS_FIN_WAIT_1:
- case TCPS_FIN_WAIT_2:
- case TCPS_CLOSE_WAIT:
- so->so_error = ECONNRESET;
- close:
- tp->t_state = TCPS_CLOSED;
- tcpstat.tcps_drops++;
- tp = tcp_close(tp);
- goto drop;
-
- case TCPS_CLOSING:
- case TCPS_LAST_ACK:
- case TCPS_TIME_WAIT:
- tp = tcp_close(tp);
- goto drop;
- }
-
- /*
- * If a SYN is in the window, then this is an
- * error and we send an RST and drop the connection.
- */
- if (tiflags & TH_SYN) {
- tp = tcp_drop(tp, ECONNRESET);
- goto dropwithreset;
- }
-
- /*
- * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN
- * flag is on (half-synchronized state), then queue data for
- * later processing; else drop segment and return.
- */
- if ((tiflags & TH_ACK) == 0) {
- if (tp->t_state == TCPS_SYN_RECEIVED ||
- (tp->t_flags & TF_NEEDSYN))
- goto step6;
- else
- goto drop;
- }
-
- /*
- * Ack processing.
- */
- switch (tp->t_state) {
-
- /*
- * In SYN_RECEIVED state, the ack ACKs our SYN, so enter
- * ESTABLISHED state and continue processing.
- * The ACK was checked above.
- */
- case TCPS_SYN_RECEIVED:
-
- tcpstat.tcps_connects++;
- soisconnected(so);
- /* Do window scaling? */
- if ((tp->t_flags & (TF_RCVD_SCALE|TF_REQ_SCALE)) ==
- (TF_RCVD_SCALE|TF_REQ_SCALE)) {
- tp->snd_scale = tp->requested_s_scale;
- tp->rcv_scale = tp->request_r_scale;
- }
- /*
- * Upon successful completion of 3-way handshake,
- * update cache.CC if it was undefined, pass any queued
- * data to the user, and advance state appropriately.
- */
- if ((taop = tcp_gettaocache(inp)) != NULL &&
- taop->tao_cc == 0)
- taop->tao_cc = tp->cc_recv;
-
- /*
- * Make transitions:
- * SYN-RECEIVED -> ESTABLISHED
- * SYN-RECEIVED* -> FIN-WAIT-1
- */
- if (tp->t_flags & TF_NEEDFIN) {
- tp->t_state = TCPS_FIN_WAIT_1;
- tp->t_flags &= ~TF_NEEDFIN;
- } else {
- tp->t_state = TCPS_ESTABLISHED;
- tp->t_timer[TCPT_KEEP] = tcp_keepidle;
- }
- /*
- * If segment contains data or ACK, will call tcp_reass()
- * later; if not, do so now to pass queued data to user.
- */
- if (ti->ti_len == 0 && (tiflags & TH_FIN) == 0)
- (void) tcp_reass(tp, (struct tcpiphdr *)0,
- (struct mbuf *)0);
- tp->snd_wl1 = ti->ti_seq - 1;
- /* fall into ... */
-
- /*
- * In ESTABLISHED state: drop duplicate ACKs; ACK out of range
- * ACKs. If the ack is in the range
- * tp->snd_una < ti->ti_ack <= tp->snd_max
- * then advance tp->snd_una to ti->ti_ack and drop
- * data from the retransmission queue. If this ACK reflects
- * more up to date window information we update our window information.
- */
- case TCPS_ESTABLISHED:
- case TCPS_FIN_WAIT_1:
- case TCPS_FIN_WAIT_2:
- case TCPS_CLOSE_WAIT:
- case TCPS_CLOSING:
- case TCPS_LAST_ACK:
- case TCPS_TIME_WAIT:
-
- if (SEQ_LEQ(ti->ti_ack, tp->snd_una)) {
- if (ti->ti_len == 0 && tiwin == tp->snd_wnd) {
- tcpstat.tcps_rcvdupack++;
- /*
- * If we have outstanding data (other than
- * a window probe), this is a completely
- * duplicate ack (ie, window info didn't
- * change), the ack is the biggest we've
- * seen and we've seen exactly our rexmt
- * threshhold of them, assume a packet
- * has been dropped and retransmit it.
- * Kludge snd_nxt & the congestion
- * window so we send only this one
- * packet.
- *
- * We know we're losing at the current
- * window size so do congestion avoidance
- * (set ssthresh to half the current window
- * and pull our congestion window back to
- * the new ssthresh).
- *
- * Dup acks mean that packets have left the
- * network (they're now cached at the receiver)
- * so bump cwnd by the amount in the receiver
- * to keep a constant cwnd packets in the
- * network.
- */
- if (tp->t_timer[TCPT_REXMT] == 0 ||
- ti->ti_ack != tp->snd_una)
- tp->t_dupacks = 0;
- else if (++tp->t_dupacks == tcprexmtthresh) {
- tcp_seq onxt = tp->snd_nxt;
- u_int win =
- min(tp->snd_wnd, tp->snd_cwnd) / 2 /
- tp->t_maxseg;
-
- if (win < 2)
- win = 2;
- tp->snd_ssthresh = win * tp->t_maxseg;
- tp->t_timer[TCPT_REXMT] = 0;
- tp->t_rtt = 0;
- tp->snd_nxt = ti->ti_ack;
- tp->snd_cwnd = tp->t_maxseg;
- (void) tcp_output(tp);
- tp->snd_cwnd = tp->snd_ssthresh +
- tp->t_maxseg * tp->t_dupacks;
- if (SEQ_GT(onxt, tp->snd_nxt))
- tp->snd_nxt = onxt;
- goto drop;
- } else if (tp->t_dupacks > tcprexmtthresh) {
- tp->snd_cwnd += tp->t_maxseg;
- (void) tcp_output(tp);
- goto drop;
- }
- } else
- tp->t_dupacks = 0;
- break;
- }
- /*
- * If the congestion window was inflated to account
- * for the other side's cached packets, retract it.
- */
- if (tp->t_dupacks >= tcprexmtthresh &&
- tp->snd_cwnd > tp->snd_ssthresh)
- tp->snd_cwnd = tp->snd_ssthresh;
- tp->t_dupacks = 0;
- if (SEQ_GT(ti->ti_ack, tp->snd_max)) {
- tcpstat.tcps_rcvacktoomuch++;
- goto dropafterack;
- }
- /*
- * If we reach this point, ACK is not a duplicate,
- * i.e., it ACKs something we sent.
- */
- if (tp->t_flags & TF_NEEDSYN) {
- /*
- * T/TCP: Connection was half-synchronized, and our
- * SYN has been ACK'd (so connection is now fully
- * synchronized). Go to non-starred state,
- * increment snd_una for ACK of SYN, and check if
- * we can do window scaling.
- */
- tp->t_flags &= ~TF_NEEDSYN;
- tp->snd_una++;
- /* Do window scaling? */
- if ((tp->t_flags & (TF_RCVD_SCALE|TF_REQ_SCALE)) ==
- (TF_RCVD_SCALE|TF_REQ_SCALE)) {
- tp->snd_scale = tp->requested_s_scale;
- tp->rcv_scale = tp->request_r_scale;
- }
- }
-
-process_ACK:
- acked = ti->ti_ack - tp->snd_una;
- tcpstat.tcps_rcvackpack++;
- tcpstat.tcps_rcvackbyte += acked;
-
- /*
- * If we have a timestamp reply, update smoothed
- * round trip time. If no timestamp is present but
- * transmit timer is running and timed sequence
- * number was acked, update smoothed round trip time.
- * Since we now have an rtt measurement, cancel the
- * timer backoff (cf., Phil Karn's retransmit alg.).
- * Recompute the initial retransmit timer.
- */
- if (to.to_flag & TOF_TS)
- tcp_xmit_timer(tp, tcp_now - to.to_tsecr + 1);
- else if (tp->t_rtt && SEQ_GT(ti->ti_ack, tp->t_rtseq))
- tcp_xmit_timer(tp,tp->t_rtt);
-
- /*
- * If all outstanding data is acked, stop retransmit
- * timer and remember to restart (more output or persist).
- * If there is more data to be acked, restart retransmit
- * timer, using current (possibly backed-off) value.
- */
- if (ti->ti_ack == tp->snd_max) {
- tp->t_timer[TCPT_REXMT] = 0;
- needoutput = 1;
- } else if (tp->t_timer[TCPT_PERSIST] == 0)
- tp->t_timer[TCPT_REXMT] = tp->t_rxtcur;
-
- /*
- * If no data (only SYN) was ACK'd,
- * skip rest of ACK processing.
- */
- if (acked == 0)
- goto step6;
-
- /*
- * When new data is acked, open the congestion window.
- * If the window gives us less than ssthresh packets
- * in flight, open exponentially (maxseg per packet).
- * Otherwise open linearly: maxseg per window
- * (maxseg^2 / cwnd per packet).
- */
- {
- register u_int cw = tp->snd_cwnd;
- register u_int incr = tp->t_maxseg;
-
- if (cw > tp->snd_ssthresh)
- incr = incr * incr / cw;
- tp->snd_cwnd = min(cw + incr, TCP_MAXWIN<<tp->snd_scale);
- }
- if (acked > so->so_snd.sb_cc) {
- tp->snd_wnd -= so->so_snd.sb_cc;
- sbdrop(&so->so_snd, (int)so->so_snd.sb_cc);
- ourfinisacked = 1;
- } else {
- sbdrop(&so->so_snd, acked);
- tp->snd_wnd -= acked;
- ourfinisacked = 0;
- }
- if (so->so_snd.sb_flags & SB_NOTIFY)
- sowwakeup(so);
- tp->snd_una = ti->ti_ack;
- if (SEQ_LT(tp->snd_nxt, tp->snd_una))
- tp->snd_nxt = tp->snd_una;
-
- switch (tp->t_state) {
-
- /*
- * In FIN_WAIT_1 STATE in addition to the processing
- * for the ESTABLISHED state if our FIN is now acknowledged
- * then enter FIN_WAIT_2.
- */
- case TCPS_FIN_WAIT_1:
- if (ourfinisacked) {
- /*
- * If we can't receive any more
- * data, then closing user can proceed.
- * Starting the timer is contrary to the
- * specification, but if we don't get a FIN
- * we'll hang forever.
- */
- if (so->so_state & SS_CANTRCVMORE) {
- soisdisconnected(so);
- tp->t_timer[TCPT_2MSL] = tcp_maxidle;
- }
- tp->t_state = TCPS_FIN_WAIT_2;
- }
- break;
-
- /*
- * In CLOSING STATE in addition to the processing for
- * the ESTABLISHED state if the ACK acknowledges our FIN
- * then enter the TIME-WAIT state, otherwise ignore
- * the segment.
- */
- case TCPS_CLOSING:
- if (ourfinisacked) {
- tp->t_state = TCPS_TIME_WAIT;
- tcp_canceltimers(tp);
- /* Shorten TIME_WAIT [RFC-1644, p.28] */
- if (tp->cc_recv != 0 &&
- tp->t_duration < TCPTV_MSL)
- tp->t_timer[TCPT_2MSL] =
- tp->t_rxtcur * TCPTV_TWTRUNC;
- else
- tp->t_timer[TCPT_2MSL] = 2 * TCPTV_MSL;
- soisdisconnected(so);
- }
- break;
-
- /*
- * In LAST_ACK, we may still be waiting for data to drain
- * and/or to be acked, as well as for the ack of our FIN.
- * If our FIN is now acknowledged, delete the TCB,
- * enter the closed state and return.
- */
- case TCPS_LAST_ACK:
- if (ourfinisacked) {
- tp = tcp_close(tp);
- goto drop;
- }
- break;
-
- /*
- * In TIME_WAIT state the only thing that should arrive
- * is a retransmission of the remote FIN. Acknowledge
- * it and restart the finack timer.
- */
- case TCPS_TIME_WAIT:
- tp->t_timer[TCPT_2MSL] = 2 * TCPTV_MSL;
- goto dropafterack;
- }
- }
-
-step6:
- /*
- * Update window information.
- * Don't look at window if no ACK: TAC's send garbage on first SYN.
- */
- if ((tiflags & TH_ACK) &&
- (SEQ_LT(tp->snd_wl1, ti->ti_seq) ||
- (tp->snd_wl1 == ti->ti_seq && (SEQ_LT(tp->snd_wl2, ti->ti_ack) ||
- (tp->snd_wl2 == ti->ti_ack && tiwin > tp->snd_wnd))))) {
- /* keep track of pure window updates */
- if (ti->ti_len == 0 &&
- tp->snd_wl2 == ti->ti_ack && tiwin > tp->snd_wnd)
- tcpstat.tcps_rcvwinupd++;
- tp->snd_wnd = tiwin;
- tp->snd_wl1 = ti->ti_seq;
- tp->snd_wl2 = ti->ti_ack;
- if (tp->snd_wnd > tp->max_sndwnd)
- tp->max_sndwnd = tp->snd_wnd;
- needoutput = 1;
- }
-
- /*
- * Process segments with URG.
- */
- if ((tiflags & TH_URG) && ti->ti_urp &&
- TCPS_HAVERCVDFIN(tp->t_state) == 0) {
- /*
- * This is a kludge, but if we receive and accept
- * random urgent pointers, we'll crash in
- * soreceive. It's hard to imagine someone
- * actually wanting to send this much urgent data.
- */
- if (ti->ti_urp + so->so_rcv.sb_cc > sb_max) {
- ti->ti_urp = 0; /* XXX */
- tiflags &= ~TH_URG; /* XXX */
- goto dodata; /* XXX */
- }
- /*
- * If this segment advances the known urgent pointer,
- * then mark the data stream. This should not happen
- * in CLOSE_WAIT, CLOSING, LAST_ACK or TIME_WAIT STATES since
- * a FIN has been received from the remote side.
- * In these states we ignore the URG.
- *
- * According to RFC961 (Assigned Protocols),
- * the urgent pointer points to the last octet
- * of urgent data. We continue, however,
- * to consider it to indicate the first octet
- * of data past the urgent section as the original
- * spec states (in one of two places).
- */
- if (SEQ_GT(ti->ti_seq+ti->ti_urp, tp->rcv_up)) {
- tp->rcv_up = ti->ti_seq + ti->ti_urp;
- so->so_oobmark = so->so_rcv.sb_cc +
- (tp->rcv_up - tp->rcv_nxt) - 1;
- if (so->so_oobmark == 0)
- so->so_state |= SS_RCVATMARK;
- sohasoutofband(so);
- tp->t_oobflags &= ~(TCPOOB_HAVEDATA | TCPOOB_HADDATA);
- }
- /*
- * Remove out of band data so doesn't get presented to user.
- * This can happen independent of advancing the URG pointer,
- * but if two URG's are pending at once, some out-of-band
- * data may creep in... ick.
- */
- if (ti->ti_urp <= (u_long)ti->ti_len
-#ifdef SO_OOBINLINE
- && (so->so_options & SO_OOBINLINE) == 0
-#endif
- )
- tcp_pulloutofband(so, ti, m);
- } else
- /*
- * If no out of band data is expected,
- * pull receive urgent pointer along
- * with the receive window.
- */
- if (SEQ_GT(tp->rcv_nxt, tp->rcv_up))
- tp->rcv_up = tp->rcv_nxt;
-dodata: /* XXX */
-
- /*
- * Process the segment text, merging it into the TCP sequencing queue,
- * and arranging for acknowledgment of receipt if necessary.
- * This process logically involves adjusting tp->rcv_wnd as data
- * is presented to the user (this happens in tcp_usrreq.c,
- * case PRU_RCVD). If a FIN has already been received on this
- * connection then we just ignore the text.
- */
- if ((ti->ti_len || (tiflags&TH_FIN)) &&
- TCPS_HAVERCVDFIN(tp->t_state) == 0) {
- TCP_REASS(tp, ti, m, so, tiflags);
- /*
- * Note the amount of data that peer has sent into
- * our window, in order to estimate the sender's
- * buffer size.
- */
- len = so->so_rcv.sb_hiwat - (tp->rcv_adv - tp->rcv_nxt);
- } else {
- m_freem(m);
- tiflags &= ~TH_FIN;
- }
-
- /*
- * If FIN is received ACK the FIN and let the user know
- * that the connection is closing.
- */
- if (tiflags & TH_FIN) {
- if (TCPS_HAVERCVDFIN(tp->t_state) == 0) {
- socantrcvmore(so);
- /*
- * If connection is half-synchronized
- * (ie NEEDSYN flag on) then delay ACK,
- * so it may be piggybacked when SYN is sent.
- * Otherwise, since we received a FIN then no
- * more input can be expected, send ACK now.
- */
- if (tp->t_flags & TF_NEEDSYN)
- tp->t_flags |= TF_DELACK;
- else
- tp->t_flags |= TF_ACKNOW;
- tp->rcv_nxt++;
- }
- switch (tp->t_state) {
-
- /*
- * In SYN_RECEIVED and ESTABLISHED STATES
- * enter the CLOSE_WAIT state.
- */
- case TCPS_SYN_RECEIVED:
- case TCPS_ESTABLISHED:
- tp->t_state = TCPS_CLOSE_WAIT;
- break;
-
- /*
- * If still in FIN_WAIT_1 STATE FIN has not been acked so
- * enter the CLOSING state.
- */
- case TCPS_FIN_WAIT_1:
- tp->t_state = TCPS_CLOSING;
- break;
-
- /*
- * In FIN_WAIT_2 state enter the TIME_WAIT state,
- * starting the time-wait timer, turning off the other
- * standard timers.
- */
- case TCPS_FIN_WAIT_2:
- tp->t_state = TCPS_TIME_WAIT;
- tcp_canceltimers(tp);
- /* Shorten TIME_WAIT [RFC-1644, p.28] */
- if (tp->cc_recv != 0 &&
- tp->t_duration < TCPTV_MSL) {
- tp->t_timer[TCPT_2MSL] =
- tp->t_rxtcur * TCPTV_TWTRUNC;
- /* For transaction client, force ACK now. */
- tp->t_flags |= TF_ACKNOW;
- }
- else
- tp->t_timer[TCPT_2MSL] = 2 * TCPTV_MSL;
- soisdisconnected(so);
- break;
-
- /*
- * In TIME_WAIT state restart the 2 MSL time_wait timer.
- */
- case TCPS_TIME_WAIT:
- tp->t_timer[TCPT_2MSL] = 2 * TCPTV_MSL;
- break;
- }
- }
-#ifdef TCPDEBUG
- if (so->so_options & SO_DEBUG)
- tcp_trace(TA_INPUT, ostate, tp, &tcp_saveti, 0);
-#endif
-
- /*
- * Return any desired output.
- */
- if (needoutput || (tp->t_flags & TF_ACKNOW))
- (void) tcp_output(tp);
- return;
-
-dropafterack:
- /*
- * Generate an ACK dropping incoming segment if it occupies
- * sequence space, where the ACK reflects our state.
- */
- if (tiflags & TH_RST)
- goto drop;
-#ifdef TCPDEBUG
- if (so->so_options & SO_DEBUG)
- tcp_trace(TA_DROP, ostate, tp, &tcp_saveti, 0);
-#endif
- m_freem(m);
- tp->t_flags |= TF_ACKNOW;
- (void) tcp_output(tp);
- return;
-
-dropwithreset:
- /*
- * Generate a RST, dropping incoming segment.
- * Make ACK acceptable to originator of segment.
- * Don't bother to respond if destination was broadcast/multicast.
- */
- if ((tiflags & TH_RST) || m->m_flags & (M_BCAST|M_MCAST) ||
- IN_MULTICAST(ntohl(ti->ti_dst.s_addr)))
- goto drop;
-#ifdef TCPDEBUG
- if (tp == 0 || (tp->t_inpcb->inp_socket->so_options & SO_DEBUG))
- tcp_trace(TA_DROP, ostate, tp, &tcp_saveti, 0);
-#endif
- if (tiflags & TH_ACK)
- tcp_respond(tp, ti, m, (tcp_seq)0, ti->ti_ack, TH_RST);
- else {
- if (tiflags & TH_SYN)
- ti->ti_len++;
- tcp_respond(tp, ti, m, ti->ti_seq+ti->ti_len, (tcp_seq)0,
- TH_RST|TH_ACK);
- }
- /* destroy temporarily created socket */
- if (dropsocket)
- (void) soabort(so);
- return;
-
-drop:
- /*
- * Drop space held by incoming segment and return.
- */
-#ifdef TCPDEBUG
- if (tp == 0 || (tp->t_inpcb->inp_socket->so_options & SO_DEBUG))
- tcp_trace(TA_DROP, ostate, tp, &tcp_saveti, 0);
-#endif
- m_freem(m);
- /* destroy temporarily created socket */
- if (dropsocket)
- (void) soabort(so);
- return;
-#ifndef TUBA_INCLUDE
-}
-
-static void
-tcp_dooptions(tp, cp, cnt, ti, to)
- struct tcpcb *tp;
- u_char *cp;
- int cnt;
- struct tcpiphdr *ti;
- struct tcpopt *to;
-{
- u_short mss = 0;
- int opt, optlen;
-
- for (; cnt > 0; cnt -= optlen, cp += optlen) {
- opt = cp[0];
- if (opt == TCPOPT_EOL)
- break;
- if (opt == TCPOPT_NOP)
- optlen = 1;
- else {
- optlen = cp[1];
- if (optlen <= 0)
- break;
- }
- switch (opt) {
-
- default:
- continue;
-
- case TCPOPT_MAXSEG:
- if (optlen != TCPOLEN_MAXSEG)
- continue;
- if (!(ti->ti_flags & TH_SYN))
- continue;
- bcopy((char *) cp + 2, (char *) &mss, sizeof(mss));
- NTOHS(mss);
- break;
-
- case TCPOPT_WINDOW:
- if (optlen != TCPOLEN_WINDOW)
- continue;
- if (!(ti->ti_flags & TH_SYN))
- continue;
- tp->t_flags |= TF_RCVD_SCALE;
- tp->requested_s_scale = min(cp[2], TCP_MAX_WINSHIFT);
- break;
-
- case TCPOPT_TIMESTAMP:
- if (optlen != TCPOLEN_TIMESTAMP)
- continue;
- to->to_flag |= TOF_TS;
- bcopy((char *)cp + 2,
- (char *)&to->to_tsval, sizeof(to->to_tsval));
- NTOHL(to->to_tsval);
- bcopy((char *)cp + 6,
- (char *)&to->to_tsecr, sizeof(to->to_tsecr));
- NTOHL(to->to_tsecr);
-
- /*
- * A timestamp received in a SYN makes
- * it ok to send timestamp requests and replies.
- */
- if (ti->ti_flags & TH_SYN) {
- tp->t_flags |= TF_RCVD_TSTMP;
- tp->ts_recent = to->to_tsval;
- tp->ts_recent_age = tcp_now;
- }
- break;
- case TCPOPT_CC:
- if (optlen != TCPOLEN_CC)
- continue;
- to->to_flag |= TOF_CC;
- bcopy((char *)cp + 2,
- (char *)&to->to_cc, sizeof(to->to_cc));
- NTOHL(to->to_cc);
- /*
- * A CC or CC.new option received in a SYN makes
- * it ok to send CC in subsequent segments.
- */
- if (ti->ti_flags & TH_SYN)
- tp->t_flags |= TF_RCVD_CC;
- break;
- case TCPOPT_CCNEW:
- if (optlen != TCPOLEN_CC)
- continue;
- if (!(ti->ti_flags & TH_SYN))
- continue;
- to->to_flag |= TOF_CCNEW;
- bcopy((char *)cp + 2,
- (char *)&to->to_cc, sizeof(to->to_cc));
- NTOHL(to->to_cc);
- /*
- * A CC or CC.new option received in a SYN makes
- * it ok to send CC in subsequent segments.
- */
- tp->t_flags |= TF_RCVD_CC;
- break;
- case TCPOPT_CCECHO:
- if (optlen != TCPOLEN_CC)
- continue;
- if (!(ti->ti_flags & TH_SYN))
- continue;
- to->to_flag |= TOF_CCECHO;
- bcopy((char *)cp + 2,
- (char *)&to->to_ccecho, sizeof(to->to_ccecho));
- NTOHL(to->to_ccecho);
- break;
- }
- }
- if (ti->ti_flags & TH_SYN)
- tcp_mss(tp, mss); /* sets t_maxseg */
-}
-
-/*
- * Pull out of band byte out of a segment so
- * it doesn't appear in the user's data queue.
- * It is still reflected in the segment length for
- * sequencing purposes.
- */
-static void
-tcp_pulloutofband(so, ti, m)
- struct socket *so;
- struct tcpiphdr *ti;
- register struct mbuf *m;
-{
- int cnt = ti->ti_urp - 1;
-
- while (cnt >= 0) {
- if (m->m_len > cnt) {
- char *cp = mtod(m, caddr_t) + cnt;
- struct tcpcb *tp = sototcpcb(so);
-
- tp->t_iobc = *cp;
- tp->t_oobflags |= TCPOOB_HAVEDATA;
- bcopy(cp+1, cp, (unsigned)(m->m_len - cnt - 1));
- m->m_len--;
- return;
- }
- cnt -= m->m_len;
- m = m->m_next;
- if (m == 0)
- break;
- }
- panic("tcp_pulloutofband");
-}
-
-/*
- * Collect new round-trip time estimate
- * and update averages and current timeout.
- */
-static void
-tcp_xmit_timer(tp, rtt)
- register struct tcpcb *tp;
- short rtt;
-{
- register int delta;
-
- tcpstat.tcps_rttupdated++;
- tp->t_rttupdated++;
- if (tp->t_srtt != 0) {
- /*
- * srtt is stored as fixed point with 5 bits after the
- * binary point (i.e., scaled by 8). The following magic
- * is equivalent to the smoothing algorithm in rfc793 with
- * an alpha of .875 (srtt = rtt/8 + srtt*7/8 in fixed
- * point). Adjust rtt to origin 0.
- */
- delta = ((rtt - 1) << TCP_DELTA_SHIFT)
- - (tp->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT));
-
- if ((tp->t_srtt += delta) <= 0)
- tp->t_srtt = 1;
-
- /*
- * We accumulate a smoothed rtt variance (actually, a
- * smoothed mean difference), then set the retransmit
- * timer to smoothed rtt + 4 times the smoothed variance.
- * rttvar is stored as fixed point with 4 bits after the
- * binary point (scaled by 16). The following is
- * equivalent to rfc793 smoothing with an alpha of .75
- * (rttvar = rttvar*3/4 + |delta| / 4). This replaces
- * rfc793's wired-in beta.
- */
- if (delta < 0)
- delta = -delta;
- delta -= tp->t_rttvar >> (TCP_RTTVAR_SHIFT - TCP_DELTA_SHIFT);
- if ((tp->t_rttvar += delta) <= 0)
- tp->t_rttvar = 1;
- } else {
- /*
- * No rtt measurement yet - use the unsmoothed rtt.
- * Set the variance to half the rtt (so our first
- * retransmit happens at 3*rtt).
- */
- tp->t_srtt = rtt << TCP_RTT_SHIFT;
- tp->t_rttvar = rtt << (TCP_RTTVAR_SHIFT - 1);
- }
- tp->t_rtt = 0;
- tp->t_rxtshift = 0;
-
- /*
- * the retransmit should happen at rtt + 4 * rttvar.
- * Because of the way we do the smoothing, srtt and rttvar
- * will each average +1/2 tick of bias. When we compute
- * the retransmit timer, we want 1/2 tick of rounding and
- * 1 extra tick because of +-1/2 tick uncertainty in the
- * firing of the timer. The bias will give us exactly the
- * 1.5 tick we need. But, because the bias is
- * statistical, we have to test that we don't drop below
- * the minimum feasible timer (which is 2 ticks).
- */
- TCPT_RANGESET(tp->t_rxtcur, TCP_REXMTVAL(tp),
- max(tp->t_rttmin, rtt + 2), TCPTV_REXMTMAX);
-
- /*
- * We received an ack for a packet that wasn't retransmitted;
- * it is probably safe to discard any error indications we've
- * received recently. This isn't quite right, but close enough
- * for now (a route might have failed after we sent a segment,
- * and the return path might not be symmetrical).
- */
- tp->t_softerror = 0;
-}
-
-/*
- * Determine a reasonable value for maxseg size.
- * If the route is known, check route for mtu.
- * If none, use an mss that can be handled on the outgoing
- * interface without forcing IP to fragment; if bigger than
- * an mbuf cluster (MCLBYTES), round down to nearest multiple of MCLBYTES
- * to utilize large mbufs. If no route is found, route has no mtu,
- * or the destination isn't local, use a default, hopefully conservative
- * size (usually 512 or the default IP max size, but no more than the mtu
- * of the interface), as we can't discover anything about intervening
- * gateways or networks. We also initialize the congestion/slow start
- * window to be a single segment if the destination isn't local.
- * While looking at the routing entry, we also initialize other path-dependent
- * parameters from pre-set or cached values in the routing entry.
- *
- * Also take into account the space needed for options that we
- * send regularly. Make maxseg shorter by that amount to assure
- * that we can send maxseg amount of data even when the options
- * are present. Store the upper limit of the length of options plus
- * data in maxopd.
- *
- * NOTE that this routine is only called when we process an incoming
- * segment, for outgoing segments only tcp_mssopt is called.
- *
- * In case of T/TCP, we call this routine during implicit connection
- * setup as well (offer = -1), to initialize maxseg from the cached
- * MSS of our peer.
- */
-void
-tcp_mss(tp, offer)
- struct tcpcb *tp;
- int offer;
-{
- register struct rtentry *rt;
- struct ifnet *ifp;
- register int rtt, mss;
- u_long bufsize;
- struct inpcb *inp;
- struct socket *so;
- struct rmxp_tao *taop;
- int origoffer = offer;
-
- inp = tp->t_inpcb;
- if ((rt = tcp_rtlookup(inp)) == NULL) {
- tp->t_maxopd = tp->t_maxseg = tcp_mssdflt;
- return;
- }
- ifp = rt->rt_ifp;
- so = inp->inp_socket;
-
- taop = rmx_taop(rt->rt_rmx);
- /*
- * Offer == -1 means that we didn't receive SYN yet,
- * use cached value in that case;
- */
- if (offer == -1)
- offer = taop->tao_mssopt;
- /*
- * Offer == 0 means that there was no MSS on the SYN segment,
- * in this case we use tcp_mssdflt.
- */
- if (offer == 0)
- offer = tcp_mssdflt;
- else
- /*
- * Sanity check: make sure that maxopd will be large
- * enough to allow some data on segments even is the
- * all the option space is used (40bytes). Otherwise
- * funny things may happen in tcp_output.
- */
- offer = max(offer, 64);
- taop->tao_mssopt = offer;
-
- /*
- * While we're here, check if there's an initial rtt
- * or rttvar. Convert from the route-table units
- * to scaled multiples of the slow timeout timer.
- */
- if (tp->t_srtt == 0 && (rtt = rt->rt_rmx.rmx_rtt)) {
- /*
- * XXX the lock bit for RTT indicates that the value
- * is also a minimum value; this is subject to time.
- */
- if (rt->rt_rmx.rmx_locks & RTV_RTT)
- tp->t_rttmin = rtt / (RTM_RTTUNIT / PR_SLOWHZ);
- tp->t_srtt = rtt / (RTM_RTTUNIT / (PR_SLOWHZ * TCP_RTT_SCALE));
- tcpstat.tcps_usedrtt++;
- if (rt->rt_rmx.rmx_rttvar) {
- tp->t_rttvar = rt->rt_rmx.rmx_rttvar /
- (RTM_RTTUNIT / (PR_SLOWHZ * TCP_RTTVAR_SCALE));
- tcpstat.tcps_usedrttvar++;
- } else {
- /* default variation is +- 1 rtt */
- tp->t_rttvar =
- tp->t_srtt * TCP_RTTVAR_SCALE / TCP_RTT_SCALE;
- }
- TCPT_RANGESET(tp->t_rxtcur,
- ((tp->t_srtt >> 2) + tp->t_rttvar) >> 1,
- tp->t_rttmin, TCPTV_REXMTMAX);
- }
- /*
- * if there's an mtu associated with the route, use it
- */
- if (rt->rt_rmx.rmx_mtu)
- mss = rt->rt_rmx.rmx_mtu - sizeof(struct tcpiphdr);
- else
- {
- mss = ifp->if_mtu - sizeof(struct tcpiphdr);
- if (!in_localaddr(inp->inp_faddr))
- mss = min(mss, tcp_mssdflt);
- }
- mss = min(mss, offer);
- /*
- * maxopd stores the maximum length of data AND options
- * in a segment; maxseg is the amount of data in a normal
- * segment. We need to store this value (maxopd) apart
- * from maxseg, because now every segment carries options
- * and thus we normally have somewhat less data in segments.
- */
- tp->t_maxopd = mss;
-
- /*
- * In case of T/TCP, origoffer==-1 indicates, that no segments
- * were received yet. In this case we just guess, otherwise
- * we do the same as before T/TCP.
- */
- if ((tp->t_flags & (TF_REQ_TSTMP|TF_NOOPT)) == TF_REQ_TSTMP &&
- (origoffer == -1 ||
- (tp->t_flags & TF_RCVD_TSTMP) == TF_RCVD_TSTMP))
- mss -= TCPOLEN_TSTAMP_APPA;
- if ((tp->t_flags & (TF_REQ_CC|TF_NOOPT)) == TF_REQ_CC &&
- (origoffer == -1 ||
- (tp->t_flags & TF_RCVD_CC) == TF_RCVD_CC))
- mss -= TCPOLEN_CC_APPA;
-
-#if (MCLBYTES & (MCLBYTES - 1)) == 0
- if (mss > MCLBYTES)
- mss &= ~(MCLBYTES-1);
-#else
- if (mss > MCLBYTES)
- mss = mss / MCLBYTES * MCLBYTES;
-#endif
- /*
- * If there's a pipesize, change the socket buffer
- * to that size. Make the socket buffers an integral
- * number of mss units; if the mss is larger than
- * the socket buffer, decrease the mss.
- */
-#ifdef RTV_SPIPE
- if ((bufsize = rt->rt_rmx.rmx_sendpipe) == 0)
-#endif
- bufsize = so->so_snd.sb_hiwat;
- if (bufsize < mss)
- mss = bufsize;
- else {
- bufsize = roundup(bufsize, mss);
- if (bufsize > sb_max)
- bufsize = sb_max;
- (void)sbreserve(&so->so_snd, bufsize);
- }
- tp->t_maxseg = mss;
-
-#ifdef RTV_RPIPE
- if ((bufsize = rt->rt_rmx.rmx_recvpipe) == 0)
-#endif
- bufsize = so->so_rcv.sb_hiwat;
- if (bufsize > mss) {
- bufsize = roundup(bufsize, mss);
- if (bufsize > sb_max)
- bufsize = sb_max;
- (void)sbreserve(&so->so_rcv, bufsize);
- }
- /*
- * Don't force slow-start on local network.
- */
- if (!in_localaddr(inp->inp_faddr))
- tp->snd_cwnd = mss;
-
- if (rt->rt_rmx.rmx_ssthresh) {
- /*
- * There's some sort of gateway or interface
- * buffer limit on the path. Use this to set
- * the slow start threshhold, but set the
- * threshold to no less than 2*mss.
- */
- tp->snd_ssthresh = max(2 * mss, rt->rt_rmx.rmx_ssthresh);
- tcpstat.tcps_usedssthresh++;
- }
-}
-
-/*
- * Determine the MSS option to send on an outgoing SYN.
- */
-int
-tcp_mssopt(tp)
- struct tcpcb *tp;
-{
- struct rtentry *rt;
-
- rt = tcp_rtlookup(tp->t_inpcb);
- if (rt == NULL)
- return tcp_mssdflt;
-
- return rt->rt_ifp->if_mtu - sizeof(struct tcpiphdr);
-}
-#endif /* TUBA_INCLUDE */