2 * Copyright (c) 2003, 2004 Jeffrey M. Hsu. All rights reserved.
3 * Copyright (c) 2003, 2004 The DragonFly Project. All rights reserved.
5 * This code is derived from software contributed to The DragonFly Project
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of The DragonFly Project nor the names of its
17 * contributors may be used to endorse or promote products derived
18 * from this software without specific, prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
24 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
27 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
30 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * Copyright (c) 2003, 2004 Jeffrey M. Hsu. All rights reserved.
37 * License terms: all terms for the DragonFly license above plus the following:
39 * 4. All advertising materials mentioning features or use of this software
40 * must display the following acknowledgement:
42 * This product includes software developed by Jeffrey M. Hsu
43 * for the DragonFly Project.
45 * This requirement may be waived with permission from Jeffrey Hsu.
46 * This requirement will sunset and may be removed on July 8 2005,
47 * after which the standard DragonFly license (as shown above) will
52 * Copyright (c) 1982, 1986, 1988, 1993
53 * The Regents of the University of California. All rights reserved.
55 * Redistribution and use in source and binary forms, with or without
56 * modification, are permitted provided that the following conditions
58 * 1. Redistributions of source code must retain the above copyright
59 * notice, this list of conditions and the following disclaimer.
60 * 2. Redistributions in binary form must reproduce the above copyright
61 * notice, this list of conditions and the following disclaimer in the
62 * documentation and/or other materials provided with the distribution.
63 * 3. All advertising materials mentioning features or use of this software
64 * must display the following acknowledgement:
65 * This product includes software developed by the University of
66 * California, Berkeley and its contributors.
67 * 4. Neither the name of the University nor the names of its contributors
68 * may be used to endorse or promote products derived from this software
69 * without specific prior written permission.
71 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
72 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
73 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
74 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
75 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
76 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
77 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
78 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
79 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
80 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
83 * From: @(#)tcp_usrreq.c 8.2 (Berkeley) 1/3/94
84 * $FreeBSD: src/sys/netinet/tcp_usrreq.c,v 1.51.2.17 2002/10/11 11:46:44 ume Exp $
85 * $DragonFly: src/sys/netinet/tcp_usrreq.c,v 1.39 2006/12/29 18:02:56 victor Exp $
88 #include "opt_ipsec.h"
89 #include "opt_inet6.h"
90 #include "opt_tcpdebug.h"
92 #include <sys/param.h>
93 #include <sys/systm.h>
94 #include <sys/kernel.h>
95 #include <sys/malloc.h>
96 #include <sys/sysctl.h>
97 #include <sys/globaldata.h>
98 #include <sys/thread.h>
100 #include <sys/mbuf.h>
102 #include <sys/domain.h>
104 #include <sys/socket.h>
105 #include <sys/socketvar.h>
106 #include <sys/protosw.h>
108 #include <sys/thread2.h>
109 #include <sys/msgport2.h>
112 #include <net/netisr.h>
113 #include <net/route.h>
115 #include <netinet/in.h>
116 #include <netinet/in_systm.h>
118 #include <netinet/ip6.h>
120 #include <netinet/in_pcb.h>
122 #include <netinet6/in6_pcb.h>
124 #include <netinet/in_var.h>
125 #include <netinet/ip_var.h>
127 #include <netinet6/ip6_var.h>
129 #include <netinet/tcp.h>
130 #include <netinet/tcp_fsm.h>
131 #include <netinet/tcp_seq.h>
132 #include <netinet/tcp_timer.h>
133 #include <netinet/tcp_var.h>
134 #include <netinet/tcpip.h>
136 #include <netinet/tcp_debug.h>
140 #include <netinet6/ipsec.h>
144 * TCP protocol interface to socket abstraction.
146 extern char *tcpstates[]; /* XXX ??? */
148 static int tcp_attach (struct socket *, struct pru_attach_info *);
149 static int tcp_connect (struct tcpcb *, struct sockaddr *,
152 static int tcp6_connect (struct tcpcb *, struct sockaddr *,
155 static struct tcpcb *
156 tcp_disconnect (struct tcpcb *);
157 static struct tcpcb *
158 tcp_usrclosed (struct tcpcb *);
161 #define TCPDEBUG0 int ostate = 0
162 #define TCPDEBUG1() ostate = tp ? tp->t_state : 0
163 #define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \
164 tcp_trace(TA_USER, ostate, tp, 0, 0, req)
168 #define TCPDEBUG2(req)
172 * TCP attaches to socket via pru_attach(), reserving space,
173 * and an internet control block.
176 tcp_usr_attach(struct socket *so, int proto, struct pru_attach_info *ai)
180 struct tcpcb *tp = 0;
191 error = tcp_attach(so, ai);
195 if ((so->so_options & SO_LINGER) && so->so_linger == 0)
196 so->so_linger = TCP_LINGERTIME;
199 TCPDEBUG2(PRU_ATTACH);
205 * pru_detach() detaches the TCP protocol from the socket.
206 * If the protocol state is non-embryonic, then can't
207 * do this directly: have to initiate a pru_disconnect(),
208 * which may finish later; embryonic TCB's can just
212 tcp_usr_detach(struct socket *so)
223 return EINVAL; /* XXX */
227 * It's possible for the tcpcb (tp) to disconnect from the inp due
228 * to tcp_drop()->tcp_close() being called. This may occur *after*
229 * the detach message has been queued so we may find a NULL tp here.
231 if ((tp = intotcpcb(inp)) != NULL) {
233 tp = tcp_disconnect(tp);
234 TCPDEBUG2(PRU_DETACH);
240 #define COMMON_START(so, inp) \
250 tp = intotcpcb(inp); \
254 #define COMMON_END(req) out: TCPDEBUG2(req); crit_exit(); return error; goto out
258 * Give the socket an address.
261 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
266 struct sockaddr_in *sinp;
268 COMMON_START(so, inp);
271 * Must check for multicast addresses and disallow binding
274 sinp = (struct sockaddr_in *)nam;
275 if (sinp->sin_family == AF_INET &&
276 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
277 error = EAFNOSUPPORT;
280 error = in_pcbbind(inp, nam, td);
283 COMMON_END(PRU_BIND);
289 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
294 struct sockaddr_in6 *sin6p;
296 COMMON_START(so, inp);
299 * Must check for multicast addresses and disallow binding
302 sin6p = (struct sockaddr_in6 *)nam;
303 if (sin6p->sin6_family == AF_INET6 &&
304 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
305 error = EAFNOSUPPORT;
308 inp->inp_vflag &= ~INP_IPV4;
309 inp->inp_vflag |= INP_IPV6;
310 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
311 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr))
312 inp->inp_vflag |= INP_IPV4;
313 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
314 struct sockaddr_in sin;
316 in6_sin6_2_sin(&sin, sin6p);
317 inp->inp_vflag |= INP_IPV4;
318 inp->inp_vflag &= ~INP_IPV6;
319 error = in_pcbbind(inp, (struct sockaddr *)&sin, td);
323 error = in6_pcbbind(inp, nam, td);
326 COMMON_END(PRU_BIND);
331 struct netmsg_inswildcard {
332 struct lwkt_msg nm_lmsg;
333 struct inpcb *nm_inp;
334 struct inpcbinfo *nm_pcbinfo;
338 in_pcbinswildcardhash_handler(struct lwkt_msg *msg0)
340 struct netmsg_inswildcard *msg = (struct netmsg_inswildcard *)msg0;
342 in_pcbinswildcardhash_oncpu(msg->nm_inp, msg->nm_pcbinfo);
343 lwkt_replymsg(&msg->nm_lmsg, 0);
349 * Prepare to accept connections.
352 tcp_usr_listen(struct socket *so, struct thread *td)
361 COMMON_START(so, inp);
362 if (inp->inp_lport == 0) {
363 error = in_pcbbind(inp, NULL, td);
368 tp->t_state = TCPS_LISTEN;
371 * We have to set the flag because we can't have other cpus
372 * messing with our inp's flags.
374 inp->inp_flags |= INP_WILDCARD_MP;
375 for (cpu = 0; cpu < ncpus2; cpu++) {
376 struct netmsg_inswildcard *msg;
378 if (cpu == mycpu->gd_cpuid) {
379 in_pcbinswildcardhash(inp);
383 msg = kmalloc(sizeof(struct netmsg_inswildcard), M_LWKTMSG,
385 lwkt_initmsg(&msg->nm_lmsg, &netisr_afree_rport, 0,
386 lwkt_cmd_func(in_pcbinswildcardhash_handler),
389 msg->nm_pcbinfo = &tcbinfo[cpu];
390 lwkt_sendmsg(tcp_cport(cpu), &msg->nm_lmsg);
393 in_pcbinswildcardhash(inp);
395 COMMON_END(PRU_LISTEN);
400 tcp6_usr_listen(struct socket *so, struct thread *td)
409 COMMON_START(so, inp);
410 if (inp->inp_lport == 0) {
411 if (!(inp->inp_flags & IN6P_IPV6_V6ONLY))
412 inp->inp_vflag |= INP_IPV4;
414 inp->inp_vflag &= ~INP_IPV4;
415 error = in6_pcbbind(inp, (struct sockaddr *)0, td);
418 tp->t_state = TCPS_LISTEN;
421 * We have to set the flag because we can't have other cpus
422 * messing with our inp's flags.
424 inp->inp_flags |= INP_WILDCARD_MP;
425 for (cpu = 0; cpu < ncpus2; cpu++) {
426 struct netmsg_inswildcard *msg;
428 if (cpu == mycpu->gd_cpuid) {
429 in_pcbinswildcardhash(inp);
433 msg = kmalloc(sizeof(struct netmsg_inswildcard), M_LWKTMSG,
435 lwkt_initmsg(&msg->nm_lmsg, &netisr_afree_rport, 0,
436 lwkt_cmd_func(in_pcbinswildcardhash_handler),
439 msg->nm_pcbinfo = &tcbinfo[cpu];
440 lwkt_sendmsg(tcp_cport(cpu), &msg->nm_lmsg);
443 in_pcbinswildcardhash(inp);
445 COMMON_END(PRU_LISTEN);
450 * Initiate connection to peer.
451 * Create a template for use in transmissions on this connection.
452 * Enter SYN_SENT state, and mark socket as connecting.
453 * Start keep-alive timer, and seed output sequence space.
454 * Send initial segment on connection.
457 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
462 struct sockaddr_in *sinp;
464 COMMON_START(so, inp);
467 * Must disallow TCP ``connections'' to multicast addresses.
469 sinp = (struct sockaddr_in *)nam;
470 if (sinp->sin_family == AF_INET
471 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
472 error = EAFNOSUPPORT;
476 if (!prison_remote_ip(td, (struct sockaddr*)sinp)) {
477 error = EAFNOSUPPORT; /* IPv6 only jail */
481 if ((error = tcp_connect(tp, nam, td)) != 0)
483 error = tcp_output(tp);
484 COMMON_END(PRU_CONNECT);
489 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
494 struct sockaddr_in6 *sin6p;
496 COMMON_START(so, inp);
499 * Must disallow TCP ``connections'' to multicast addresses.
501 sin6p = (struct sockaddr_in6 *)nam;
502 if (sin6p->sin6_family == AF_INET6
503 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
504 error = EAFNOSUPPORT;
508 if (!prison_remote_ip(td, nam)) {
509 error = EAFNOSUPPORT; /* IPv4 only jail */
513 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
514 struct sockaddr_in sin;
516 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
521 in6_sin6_2_sin(&sin, sin6p);
522 inp->inp_vflag |= INP_IPV4;
523 inp->inp_vflag &= ~INP_IPV6;
524 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0)
526 error = tcp_output(tp);
529 inp->inp_vflag &= ~INP_IPV4;
530 inp->inp_vflag |= INP_IPV6;
531 inp->inp_inc.inc_isipv6 = 1;
532 if ((error = tcp6_connect(tp, nam, td)) != 0)
534 error = tcp_output(tp);
535 COMMON_END(PRU_CONNECT);
540 * Initiate disconnect from peer.
541 * If connection never passed embryonic stage, just drop;
542 * else if don't need to let data drain, then can just drop anyways,
543 * else have to begin TCP shutdown process: mark socket disconnecting,
544 * drain unread data, state switch to reflect user close, and
545 * send segment (e.g. FIN) to peer. Socket will be really disconnected
546 * when peer sends FIN and acks ours.
548 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
551 tcp_usr_disconnect(struct socket *so)
557 COMMON_START(so, inp);
558 tp = tcp_disconnect(tp);
559 COMMON_END(PRU_DISCONNECT);
563 * Accept a connection. Essentially all the work is
564 * done at higher levels; just return the address
565 * of the peer, storing through addr.
568 tcp_usr_accept(struct socket *so, struct sockaddr **nam)
572 struct tcpcb *tp = NULL;
577 if (so->so_state & SS_ISDISCONNECTED) {
578 error = ECONNABORTED;
587 in_setpeeraddr(so, nam);
588 COMMON_END(PRU_ACCEPT);
593 tcp6_usr_accept(struct socket *so, struct sockaddr **nam)
597 struct tcpcb *tp = NULL;
603 if (so->so_state & SS_ISDISCONNECTED) {
604 error = ECONNABORTED;
613 in6_mapped_peeraddr(so, nam);
614 COMMON_END(PRU_ACCEPT);
618 * Mark the connection as being incapable of further output.
621 tcp_usr_shutdown(struct socket *so)
627 COMMON_START(so, inp);
629 tp = tcp_usrclosed(tp);
631 error = tcp_output(tp);
632 COMMON_END(PRU_SHUTDOWN);
636 * After a receive, possibly send window update to peer.
639 tcp_usr_rcvd(struct socket *so, int flags)
645 COMMON_START(so, inp);
647 COMMON_END(PRU_RCVD);
651 * Do a send by putting data in output queue and updating urgent
652 * marker if URG set. Possibly send more data. Unlike the other
653 * pru_*() routines, the mbuf chains are our responsibility. We
654 * must either enqueue them or free them. The other pru_* routines
655 * generally are caller-frees.
658 tcp_usr_send(struct socket *so, int flags, struct mbuf *m,
659 struct sockaddr *nam, struct mbuf *control, struct thread *td)
674 * OOPS! we lost a race, the TCP session got reset after
675 * we checked SS_CANTSENDMORE, eg: while doing uiomove or a
676 * network interrupt in the non-critical section of sosend().
682 error = ECONNRESET; /* XXX EPIPE? */
688 isipv6 = nam && nam->sa_family == AF_INET6;
693 /* TCP doesn't do control messages (rights, creds, etc) */
694 if (control->m_len) {
701 m_freem(control); /* empty control, just free it */
703 if(!(flags & PRUS_OOB)) {
704 sbappendstream(&so->so_snd, m);
705 if (nam && tp->t_state < TCPS_SYN_SENT) {
707 * Do implied connect if not yet connected,
708 * initialize window to default value, and
709 * initialize maxseg/maxopd using peer's cached
714 error = tcp6_connect(tp, nam, td);
717 error = tcp_connect(tp, nam, td);
720 tp->snd_wnd = TTCP_CLIENT_SND_WND;
724 if (flags & PRUS_EOF) {
726 * Close the send side of the connection after
730 tp = tcp_usrclosed(tp);
733 if (flags & PRUS_MORETOCOME)
734 tp->t_flags |= TF_MORETOCOME;
735 error = tcp_output(tp);
736 if (flags & PRUS_MORETOCOME)
737 tp->t_flags &= ~TF_MORETOCOME;
740 if (sbspace(&so->so_snd) < -512) {
746 * According to RFC961 (Assigned Protocols),
747 * the urgent pointer points to the last octet
748 * of urgent data. We continue, however,
749 * to consider it to indicate the first octet
750 * of data past the urgent section.
751 * Otherwise, snd_up should be one lower.
753 sbappendstream(&so->so_snd, m);
754 if (nam && tp->t_state < TCPS_SYN_SENT) {
756 * Do implied connect if not yet connected,
757 * initialize window to default value, and
758 * initialize maxseg/maxopd using peer's cached
763 error = tcp6_connect(tp, nam, td);
766 error = tcp_connect(tp, nam, td);
769 tp->snd_wnd = TTCP_CLIENT_SND_WND;
772 tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
773 tp->t_flags |= TF_FORCE;
774 error = tcp_output(tp);
775 tp->t_flags &= ~TF_FORCE;
777 COMMON_END((flags & PRUS_OOB) ? PRU_SENDOOB :
778 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
785 tcp_usr_abort(struct socket *so)
791 COMMON_START(so, inp);
792 tp = tcp_drop(tp, ECONNABORTED);
793 COMMON_END(PRU_ABORT);
797 * Receive out-of-band data.
800 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags)
806 COMMON_START(so, inp);
807 if ((so->so_oobmark == 0 &&
808 (so->so_state & SS_RCVATMARK) == 0) ||
809 so->so_options & SO_OOBINLINE ||
810 tp->t_oobflags & TCPOOB_HADDATA) {
814 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
819 *mtod(m, caddr_t) = tp->t_iobc;
820 if ((flags & MSG_PEEK) == 0)
821 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
822 COMMON_END(PRU_RCVOOB);
825 /* xxx - should be const */
826 struct pr_usrreqs tcp_usrreqs = {
827 tcp_usr_abort, tcp_usr_accept, tcp_usr_attach, tcp_usr_bind,
828 tcp_usr_connect, pru_connect2_notsupp, in_control, tcp_usr_detach,
829 tcp_usr_disconnect, tcp_usr_listen, in_setpeeraddr, tcp_usr_rcvd,
830 tcp_usr_rcvoob, tcp_usr_send, pru_sense_null, tcp_usr_shutdown,
831 in_setsockaddr, sosend, soreceive, sopoll
835 struct pr_usrreqs tcp6_usrreqs = {
836 tcp_usr_abort, tcp6_usr_accept, tcp_usr_attach, tcp6_usr_bind,
837 tcp6_usr_connect, pru_connect2_notsupp, in6_control, tcp_usr_detach,
838 tcp_usr_disconnect, tcp6_usr_listen, in6_mapped_peeraddr, tcp_usr_rcvd,
839 tcp_usr_rcvoob, tcp_usr_send, pru_sense_null, tcp_usr_shutdown,
840 in6_mapped_sockaddr, sosend, soreceive, sopoll
845 tcp_connect_oncpu(struct tcpcb *tp, struct sockaddr_in *sin,
846 struct sockaddr_in *if_sin)
848 struct inpcb *inp = tp->t_inpcb, *oinp;
849 struct socket *so = inp->inp_socket;
851 struct rmxp_tao *taop;
852 struct rmxp_tao tao_noncached;
854 oinp = in_pcblookup_hash(&tcbinfo[mycpu->gd_cpuid],
855 sin->sin_addr, sin->sin_port,
856 inp->inp_laddr.s_addr != INADDR_ANY ?
857 inp->inp_laddr : if_sin->sin_addr,
858 inp->inp_lport, 0, NULL);
860 if (oinp != inp && (otp = intotcpcb(oinp)) != NULL &&
861 otp->t_state == TCPS_TIME_WAIT &&
862 (ticks - otp->t_starttime) < tcp_msl &&
863 (otp->t_flags & TF_RCVD_CC))
868 if (inp->inp_laddr.s_addr == INADDR_ANY)
869 inp->inp_laddr = if_sin->sin_addr;
870 inp->inp_faddr = sin->sin_addr;
871 inp->inp_fport = sin->sin_port;
872 inp->inp_cpcbinfo = &tcbinfo[mycpu->gd_cpuid];
873 in_pcbinsconnhash(inp);
875 /* Compute window scaling to request. */
876 while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
877 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
878 tp->request_r_scale++;
881 tcpstat.tcps_connattempt++;
882 tp->t_state = TCPS_SYN_SENT;
883 callout_reset(tp->tt_keep, tcp_keepinit, tcp_timer_keep, tp);
884 tp->iss = tcp_new_isn(tp);
888 * Generate a CC value for this connection and
889 * check whether CC or CCnew should be used.
891 if ((taop = tcp_gettaocache(&tp->t_inpcb->inp_inc)) == NULL) {
892 taop = &tao_noncached;
893 bzero(taop, sizeof *taop);
896 tp->cc_send = CC_INC(tcp_ccgen);
897 if (taop->tao_ccsent != 0 &&
898 CC_GEQ(tp->cc_send, taop->tao_ccsent)) {
899 taop->tao_ccsent = tp->cc_send;
901 taop->tao_ccsent = 0;
902 tp->t_flags |= TF_SENDCCNEW;
910 struct netmsg_tcp_connect {
911 struct lwkt_msg nm_lmsg;
913 struct sockaddr_in *nm_sin;
914 struct sockaddr_in *nm_ifsin;
918 tcp_connect_handler(lwkt_msg_t lmsg)
920 struct netmsg_tcp_connect *msg = (void *)lmsg;
923 error = tcp_connect_oncpu(msg->nm_tp, msg->nm_sin, msg->nm_ifsin);
924 lwkt_replymsg(lmsg, error);
931 * Common subroutine to open a TCP connection to remote host specified
932 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local
933 * port number if needed. Call in_pcbladdr to do the routing and to choose
934 * a local host address (interface). If there is an existing incarnation
935 * of the same connection in TIME-WAIT state and if the remote host was
936 * sending CC options and if the connection duration was < MSL, then
937 * truncate the previous TIME-WAIT state and proceed.
938 * Initialize connection parameters and enter SYN-SENT state.
941 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
943 struct inpcb *inp = tp->t_inpcb;
944 struct sockaddr_in *sin = (struct sockaddr_in *)nam;
945 struct sockaddr_in *if_sin;
951 if (inp->inp_lport == 0) {
952 error = in_pcbbind(inp, (struct sockaddr *)NULL, td);
958 * Cannot simply call in_pcbconnect, because there might be an
959 * earlier incarnation of this same connection still in
960 * TIME_WAIT state, creating an ADDRINUSE error.
962 error = in_pcbladdr(inp, nam, &if_sin, td);
967 port = tcp_addrport(sin->sin_addr.s_addr, sin->sin_port,
968 inp->inp_laddr.s_addr ?
969 inp->inp_laddr.s_addr : if_sin->sin_addr.s_addr,
972 if (port->mp_td != curthread) {
973 struct netmsg_tcp_connect msg;
975 lwkt_initmsg(&msg.nm_lmsg, &curthread->td_msgport, 0,
976 lwkt_cmd_func(tcp_connect_handler), lwkt_cmd_op_none);
979 msg.nm_ifsin = if_sin;
980 error = lwkt_domsg(port, &msg.nm_lmsg);
983 error = tcp_connect_oncpu(tp, sin, if_sin);
990 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
992 struct inpcb *inp = tp->t_inpcb, *oinp;
993 struct socket *so = inp->inp_socket;
995 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
996 struct in6_addr *addr6;
997 struct rmxp_tao *taop;
998 struct rmxp_tao tao_noncached;
1001 if (inp->inp_lport == 0) {
1002 error = in6_pcbbind(inp, (struct sockaddr *)0, td);
1008 * Cannot simply call in_pcbconnect, because there might be an
1009 * earlier incarnation of this same connection still in
1010 * TIME_WAIT state, creating an ADDRINUSE error.
1012 error = in6_pcbladdr(inp, nam, &addr6, td);
1015 oinp = in6_pcblookup_hash(inp->inp_cpcbinfo,
1016 &sin6->sin6_addr, sin6->sin6_port,
1017 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) ?
1018 addr6 : &inp->in6p_laddr,
1019 inp->inp_lport, 0, NULL);
1021 if (oinp != inp && (otp = intotcpcb(oinp)) != NULL &&
1022 otp->t_state == TCPS_TIME_WAIT &&
1023 (ticks - otp->t_starttime) < tcp_msl &&
1024 (otp->t_flags & TF_RCVD_CC))
1025 otp = tcp_close(otp);
1027 return (EADDRINUSE);
1029 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
1030 inp->in6p_laddr = *addr6;
1031 inp->in6p_faddr = sin6->sin6_addr;
1032 inp->inp_fport = sin6->sin6_port;
1033 if ((sin6->sin6_flowinfo & IPV6_FLOWINFO_MASK) != NULL)
1034 inp->in6p_flowinfo = sin6->sin6_flowinfo;
1035 in_pcbinsconnhash(inp);
1037 /* Compute window scaling to request. */
1038 while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1039 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
1040 tp->request_r_scale++;
1043 tcpstat.tcps_connattempt++;
1044 tp->t_state = TCPS_SYN_SENT;
1045 callout_reset(tp->tt_keep, tcp_keepinit, tcp_timer_keep, tp);
1046 tp->iss = tcp_new_isn(tp);
1047 tcp_sendseqinit(tp);
1050 * Generate a CC value for this connection and
1051 * check whether CC or CCnew should be used.
1053 if ((taop = tcp_gettaocache(&tp->t_inpcb->inp_inc)) == NULL) {
1054 taop = &tao_noncached;
1055 bzero(taop, sizeof *taop);
1058 tp->cc_send = CC_INC(tcp_ccgen);
1059 if (taop->tao_ccsent != 0 &&
1060 CC_GEQ(tp->cc_send, taop->tao_ccsent)) {
1061 taop->tao_ccsent = tp->cc_send;
1063 taop->tao_ccsent = 0;
1064 tp->t_flags |= TF_SENDCCNEW;
1072 * The new sockopt interface makes it possible for us to block in the
1073 * copyin/out step (if we take a page fault). Taking a page fault while
1074 * in a critical section is probably a Bad Thing. (Since sockets and pcbs
1075 * both now use TSM, there probably isn't any need for this function to
1076 * run in a critical section any more. This needs more examination.)
1079 tcp_ctloutput(struct socket *so, struct sockopt *sopt)
1081 int error, opt, optval;
1086 crit_enter(); /* XXX */
1090 return (ECONNRESET);
1092 if (sopt->sopt_level != IPPROTO_TCP) {
1094 if (INP_CHECK_SOCKAF(so, AF_INET6))
1095 error = ip6_ctloutput(so, sopt);
1098 error = ip_ctloutput(so, sopt);
1102 tp = intotcpcb(inp);
1104 switch (sopt->sopt_dir) {
1106 switch (sopt->sopt_name) {
1109 error = sooptcopyin(sopt, &optval, sizeof optval,
1114 switch (sopt->sopt_name) {
1122 opt = 0; /* dead code to fool gcc */
1129 tp->t_flags &= ~opt;
1133 error = sooptcopyin(sopt, &optval, sizeof optval,
1139 tp->t_flags |= TF_NOPUSH;
1141 tp->t_flags &= ~TF_NOPUSH;
1142 error = tcp_output(tp);
1147 error = sooptcopyin(sopt, &optval, sizeof optval,
1152 if (optval > 0 && optval <= tp->t_maxseg)
1153 tp->t_maxseg = optval;
1159 error = ENOPROTOOPT;
1165 switch (sopt->sopt_name) {
1167 optval = tp->t_flags & TF_NODELAY;
1170 optval = tp->t_maxseg;
1173 optval = tp->t_flags & TF_NOOPT;
1176 optval = tp->t_flags & TF_NOPUSH;
1179 error = ENOPROTOOPT;
1183 error = sooptcopyout(sopt, &optval, sizeof optval);
1191 * tcp_sendspace and tcp_recvspace are the default send and receive window
1192 * sizes, respectively. These are obsolescent (this information should
1193 * be set by the route).
1195 u_long tcp_sendspace = 1024*32;
1196 SYSCTL_INT(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW,
1197 &tcp_sendspace , 0, "Maximum outgoing TCP datagram size");
1198 u_long tcp_recvspace = 57344; /* largest multiple of PAGE_SIZE < 64k */
1199 SYSCTL_INT(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
1200 &tcp_recvspace , 0, "Maximum incoming TCP datagram size");
1203 * Attach TCP protocol to socket, allocating
1204 * internet protocol control block, tcp control block,
1205 * bufer space, and entering LISTEN state if to accept connections.
1208 tcp_attach(struct socket *so, struct pru_attach_info *ai)
1215 int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6) != NULL;
1218 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1219 error = soreserve(so, tcp_sendspace, tcp_recvspace,
1224 cpu = mycpu->gd_cpuid;
1225 error = in_pcballoc(so, &tcbinfo[cpu]);
1231 inp->inp_vflag |= INP_IPV6;
1232 inp->in6p_hops = -1; /* use kernel default */
1236 inp->inp_vflag |= INP_IPV4;
1237 tp = tcp_newtcpcb(inp);
1239 int nofd = so->so_state & SS_NOFDREF; /* XXX */
1241 so->so_state &= ~SS_NOFDREF; /* don't free the socket yet */
1248 so->so_state |= nofd;
1251 tp->t_state = TCPS_CLOSED;
1256 * Initiate (or continue) disconnect.
1257 * If embryonic state, just send reset (once).
1258 * If in ``let data drain'' option and linger null, just drop.
1259 * Otherwise (hard), mark socket disconnecting and drop
1260 * current input data; switch states based on user close, and
1261 * send segment to peer (with FIN).
1263 static struct tcpcb *
1264 tcp_disconnect(struct tcpcb *tp)
1266 struct socket *so = tp->t_inpcb->inp_socket;
1268 if (tp->t_state < TCPS_ESTABLISHED)
1270 else if ((so->so_options & SO_LINGER) && so->so_linger == 0)
1271 tp = tcp_drop(tp, 0);
1273 soisdisconnecting(so);
1274 sbflush(&so->so_rcv);
1275 tp = tcp_usrclosed(tp);
1283 * User issued close, and wish to trail through shutdown states:
1284 * if never received SYN, just forget it. If got a SYN from peer,
1285 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
1286 * If already got a FIN from peer, then almost done; go to LAST_ACK
1287 * state. In all other cases, have already sent FIN to peer (e.g.
1288 * after PRU_SHUTDOWN), and just have to play tedious game waiting
1289 * for peer to send FIN or not respond to keep-alives, etc.
1290 * We can let the user exit from the close as soon as the FIN is acked.
1292 static struct tcpcb *
1293 tcp_usrclosed(struct tcpcb *tp)
1296 switch (tp->t_state) {
1300 tp->t_state = TCPS_CLOSED;
1305 case TCPS_SYN_RECEIVED:
1306 tp->t_flags |= TF_NEEDFIN;
1309 case TCPS_ESTABLISHED:
1310 tp->t_state = TCPS_FIN_WAIT_1;
1313 case TCPS_CLOSE_WAIT:
1314 tp->t_state = TCPS_LAST_ACK;
1317 if (tp && tp->t_state >= TCPS_FIN_WAIT_2) {
1318 soisdisconnected(tp->t_inpcb->inp_socket);
1319 /* To prevent the connection hanging in FIN_WAIT_2 forever. */
1320 if (tp->t_state == TCPS_FIN_WAIT_2)
1321 callout_reset(tp->tt_2msl, tcp_maxidle,
1322 tcp_timer_2msl, tp);