2 * Copyright (c) 1982, 1986, 1988, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * From: @(#)tcp_usrreq.c 8.2 (Berkeley) 1/3/94
34 * $FreeBSD: src/sys/netinet/tcp_usrreq.c,v 1.51.2.17 2002/10/11 11:46:44 ume Exp $
35 * $DragonFly: src/sys/netinet/tcp_usrreq.c,v 1.23 2004/05/20 04:32:59 hsu Exp $
38 #include "opt_ipsec.h"
39 #include "opt_inet6.h"
40 #include "opt_tcpdebug.h"
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/kernel.h>
45 #include <sys/malloc.h>
46 #include <sys/sysctl.h>
47 #include <sys/globaldata.h>
48 #include <sys/thread.h>
52 #include <sys/domain.h>
54 #include <sys/socket.h>
55 #include <sys/socketvar.h>
56 #include <sys/protosw.h>
58 #include <sys/msgport2.h>
61 #include <net/netisr.h>
62 #include <net/route.h>
64 #include <netinet/in.h>
65 #include <netinet/in_systm.h>
67 #include <netinet/ip6.h>
69 #include <netinet/in_pcb.h>
71 #include <netinet6/in6_pcb.h>
73 #include <netinet/in_var.h>
74 #include <netinet/ip_var.h>
76 #include <netinet6/ip6_var.h>
78 #include <netinet/tcp.h>
79 #include <netinet/tcp_fsm.h>
80 #include <netinet/tcp_seq.h>
81 #include <netinet/tcp_timer.h>
82 #include <netinet/tcp_var.h>
83 #include <netinet/tcpip.h>
85 #include <netinet/tcp_debug.h>
89 #include <netinet6/ipsec.h>
93 * TCP protocol interface to socket abstraction.
95 extern char *tcpstates[]; /* XXX ??? */
97 static int tcp_attach (struct socket *, struct pru_attach_info *);
98 static int tcp_connect (struct tcpcb *, struct sockaddr *,
101 static int tcp6_connect (struct tcpcb *, struct sockaddr *,
104 static struct tcpcb *
105 tcp_disconnect (struct tcpcb *);
106 static struct tcpcb *
107 tcp_usrclosed (struct tcpcb *);
110 #define TCPDEBUG0 int ostate = 0
111 #define TCPDEBUG1() ostate = tp ? tp->t_state : 0
112 #define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \
113 tcp_trace(TA_USER, ostate, tp, 0, 0, req)
117 #define TCPDEBUG2(req)
121 * TCP attaches to socket via pru_attach(), reserving space,
122 * and an internet control block.
125 tcp_usr_attach(struct socket *so, int proto, struct pru_attach_info *ai)
129 struct inpcb *inp = sotoinpcb(so);
130 struct tcpcb *tp = 0;
139 error = tcp_attach(so, ai);
143 if ((so->so_options & SO_LINGER) && so->so_linger == 0)
144 so->so_linger = TCP_LINGERTIME;
147 TCPDEBUG2(PRU_ATTACH);
153 * pru_detach() detaches the TCP protocol from the socket.
154 * If the protocol state is non-embryonic, then can't
155 * do this directly: have to initiate a pru_disconnect(),
156 * which may finish later; embryonic TCB's can just
160 tcp_usr_detach(struct socket *so)
164 struct inpcb *inp = sotoinpcb(so);
170 return EINVAL; /* XXX */
174 tp = tcp_disconnect(tp);
176 TCPDEBUG2(PRU_DETACH);
181 #define COMMON_START() TCPDEBUG0; \
187 tp = intotcpcb(inp); \
191 #define COMMON_END(req) out: TCPDEBUG2(req); splx(s); return error; goto out
195 * Give the socket an address.
198 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
202 struct inpcb *inp = sotoinpcb(so);
204 struct sockaddr_in *sinp;
209 * Must check for multicast addresses and disallow binding
212 sinp = (struct sockaddr_in *)nam;
213 if (sinp->sin_family == AF_INET &&
214 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
215 error = EAFNOSUPPORT;
218 error = in_pcbbind(inp, nam, td);
221 COMMON_END(PRU_BIND);
227 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
231 struct inpcb *inp = sotoinpcb(so);
233 struct sockaddr_in6 *sin6p;
238 * Must check for multicast addresses and disallow binding
241 sin6p = (struct sockaddr_in6 *)nam;
242 if (sin6p->sin6_family == AF_INET6 &&
243 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
244 error = EAFNOSUPPORT;
247 inp->inp_vflag &= ~INP_IPV4;
248 inp->inp_vflag |= INP_IPV6;
249 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
250 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr))
251 inp->inp_vflag |= INP_IPV4;
252 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
253 struct sockaddr_in sin;
255 in6_sin6_2_sin(&sin, sin6p);
256 inp->inp_vflag |= INP_IPV4;
257 inp->inp_vflag &= ~INP_IPV6;
258 error = in_pcbbind(inp, (struct sockaddr *)&sin, td);
262 error = in6_pcbbind(inp, nam, td);
265 COMMON_END(PRU_BIND);
270 struct netmsg_inswildcard {
271 struct lwkt_msg nm_lmsg;
272 struct inpcb *nm_inp;
273 struct inpcbinfo *nm_pcbinfo;
277 in_pcbinswildcardhash_handler(struct lwkt_msg *msg0)
279 struct netmsg_inswildcard *msg = (struct netmsg_inswildcard *)msg0;
281 in_pcbinswildcardhash_oncpu(msg->nm_inp, msg->nm_pcbinfo);
282 lwkt_replymsg(&msg->nm_lmsg, 0);
288 * Prepare to accept connections.
291 tcp_usr_listen(struct socket *so, struct thread *td)
295 struct inpcb *inp = sotoinpcb(so);
302 if (inp->inp_lport == 0) {
303 error = in_pcbbind(inp, NULL, td);
308 tp->t_state = TCPS_LISTEN;
310 for (cpu = 0; cpu < ncpus2; cpu++) {
311 struct netmsg_inswildcard *msg;
313 if (cpu == mycpu->gd_cpuid) {
314 in_pcbinswildcardhash_oncpu(inp, &tcbinfo[cpu]);
318 msg = malloc(sizeof(struct netmsg_inswildcard), M_LWKTMSG,
320 lwkt_initmsg(&msg->nm_lmsg, &netisr_afree_rport, 0,
321 lwkt_cmd_func(in_pcbinswildcardhash_handler),
324 msg->nm_pcbinfo = &tcbinfo[cpu];
325 lwkt_sendmsg(tcp_cport(cpu), &msg->nm_lmsg);
327 inp->inp_flags |= INP_WILDCARD_MP;
329 in_pcbinswildcardhash(inp);
331 COMMON_END(PRU_LISTEN);
336 tcp6_usr_listen(struct socket *so, struct thread *td)
340 struct inpcb *inp = sotoinpcb(so);
344 if (inp->inp_lport == 0) {
345 inp->inp_vflag &= ~INP_IPV4;
346 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
347 inp->inp_vflag |= INP_IPV4;
348 error = in6_pcbbind(inp, (struct sockaddr *)0, td);
351 tp->t_state = TCPS_LISTEN;
352 in_pcbinswildcardhash(inp);
353 COMMON_END(PRU_LISTEN);
358 * Initiate connection to peer.
359 * Create a template for use in transmissions on this connection.
360 * Enter SYN_SENT state, and mark socket as connecting.
361 * Start keep-alive timer, and seed output sequence space.
362 * Send initial segment on connection.
365 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
369 struct inpcb *inp = sotoinpcb(so);
371 struct sockaddr_in *sinp;
376 * Must disallow TCP ``connections'' to multicast addresses.
378 sinp = (struct sockaddr_in *)nam;
379 if (sinp->sin_family == AF_INET
380 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
381 error = EAFNOSUPPORT;
385 prison_remote_ip(td, 0, &sinp->sin_addr.s_addr);
387 if ((error = tcp_connect(tp, nam, td)) != 0)
389 error = tcp_output(tp);
390 COMMON_END(PRU_CONNECT);
395 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
399 struct inpcb *inp = sotoinpcb(so);
401 struct sockaddr_in6 *sin6p;
406 * Must disallow TCP ``connections'' to multicast addresses.
408 sin6p = (struct sockaddr_in6 *)nam;
409 if (sin6p->sin6_family == AF_INET6
410 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
411 error = EAFNOSUPPORT;
415 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
416 struct sockaddr_in sin;
418 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
423 in6_sin6_2_sin(&sin, sin6p);
424 inp->inp_vflag |= INP_IPV4;
425 inp->inp_vflag &= ~INP_IPV6;
426 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0)
428 error = tcp_output(tp);
431 inp->inp_vflag &= ~INP_IPV4;
432 inp->inp_vflag |= INP_IPV6;
433 inp->inp_inc.inc_isipv6 = 1;
434 if ((error = tcp6_connect(tp, nam, td)) != 0)
436 error = tcp_output(tp);
437 COMMON_END(PRU_CONNECT);
442 * Initiate disconnect from peer.
443 * If connection never passed embryonic stage, just drop;
444 * else if don't need to let data drain, then can just drop anyways,
445 * else have to begin TCP shutdown process: mark socket disconnecting,
446 * drain unread data, state switch to reflect user close, and
447 * send segment (e.g. FIN) to peer. Socket will be really disconnected
448 * when peer sends FIN and acks ours.
450 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
453 tcp_usr_disconnect(struct socket *so)
457 struct inpcb *inp = sotoinpcb(so);
461 tp = tcp_disconnect(tp);
462 COMMON_END(PRU_DISCONNECT);
466 * Accept a connection. Essentially all the work is
467 * done at higher levels; just return the address
468 * of the peer, storing through addr.
471 tcp_usr_accept(struct socket *so, struct sockaddr **nam)
475 struct inpcb *inp = sotoinpcb(so);
476 struct tcpcb *tp = NULL;
479 if (so->so_state & SS_ISDISCONNECTED) {
480 error = ECONNABORTED;
489 in_setpeeraddr(so, nam);
490 COMMON_END(PRU_ACCEPT);
495 tcp6_usr_accept(struct socket *so, struct sockaddr **nam)
499 struct inpcb *inp = sotoinpcb(so);
500 struct tcpcb *tp = NULL;
503 if (so->so_state & SS_ISDISCONNECTED) {
504 error = ECONNABORTED;
513 in6_mapped_peeraddr(so, nam);
514 COMMON_END(PRU_ACCEPT);
518 * Mark the connection as being incapable of further output.
521 tcp_usr_shutdown(struct socket *so)
525 struct inpcb *inp = sotoinpcb(so);
530 tp = tcp_usrclosed(tp);
532 error = tcp_output(tp);
533 COMMON_END(PRU_SHUTDOWN);
537 * After a receive, possibly send window update to peer.
540 tcp_usr_rcvd(struct socket *so, int flags)
544 struct inpcb *inp = sotoinpcb(so);
549 COMMON_END(PRU_RCVD);
553 * Do a send by putting data in output queue and updating urgent
554 * marker if URG set. Possibly send more data. Unlike the other
555 * pru_*() routines, the mbuf chains are our responsibility. We
556 * must either enqueue them or free them. The other pru_* routines
557 * generally are caller-frees.
560 tcp_usr_send(struct socket *so, int flags, struct mbuf *m,
561 struct sockaddr *nam, struct mbuf *control, struct thread *td)
565 struct inpcb *inp = sotoinpcb(so);
574 * OOPS! we lost a race, the TCP session got reset after
575 * we checked SS_CANTSENDMORE, eg: while doing uiomove or a
576 * network interrupt in the non-splnet() section of sosend().
582 error = ECONNRESET; /* XXX EPIPE? */
588 isipv6 = nam && nam->sa_family == AF_INET6;
593 /* TCP doesn't do control messages (rights, creds, etc) */
594 if (control->m_len) {
601 m_freem(control); /* empty control, just free it */
603 if(!(flags & PRUS_OOB)) {
604 sbappend(&so->so_snd, m);
605 if (nam && tp->t_state < TCPS_SYN_SENT) {
607 * Do implied connect if not yet connected,
608 * initialize window to default value, and
609 * initialize maxseg/maxopd using peer's cached
614 error = tcp6_connect(tp, nam, td);
617 error = tcp_connect(tp, nam, td);
620 tp->snd_wnd = TTCP_CLIENT_SND_WND;
624 if (flags & PRUS_EOF) {
626 * Close the send side of the connection after
630 tp = tcp_usrclosed(tp);
633 if (flags & PRUS_MORETOCOME)
634 tp->t_flags |= TF_MORETOCOME;
635 error = tcp_output(tp);
636 if (flags & PRUS_MORETOCOME)
637 tp->t_flags &= ~TF_MORETOCOME;
640 if (sbspace(&so->so_snd) < -512) {
646 * According to RFC961 (Assigned Protocols),
647 * the urgent pointer points to the last octet
648 * of urgent data. We continue, however,
649 * to consider it to indicate the first octet
650 * of data past the urgent section.
651 * Otherwise, snd_up should be one lower.
653 sbappend(&so->so_snd, m);
654 if (nam && tp->t_state < TCPS_SYN_SENT) {
656 * Do implied connect if not yet connected,
657 * initialize window to default value, and
658 * initialize maxseg/maxopd using peer's cached
663 error = tcp6_connect(tp, nam, td);
666 error = tcp_connect(tp, nam, td);
669 tp->snd_wnd = TTCP_CLIENT_SND_WND;
672 tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
673 tp->t_flags |= TF_FORCE;
674 error = tcp_output(tp);
675 tp->t_flags &= ~TF_FORCE;
677 COMMON_END((flags & PRUS_OOB) ? PRU_SENDOOB :
678 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
685 tcp_usr_abort(struct socket *so)
689 struct inpcb *inp = sotoinpcb(so);
693 tp = tcp_drop(tp, ECONNABORTED);
694 COMMON_END(PRU_ABORT);
698 * Receive out-of-band data.
701 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags)
705 struct inpcb *inp = sotoinpcb(so);
709 if ((so->so_oobmark == 0 &&
710 (so->so_state & SS_RCVATMARK) == 0) ||
711 so->so_options & SO_OOBINLINE ||
712 tp->t_oobflags & TCPOOB_HADDATA) {
716 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
721 *mtod(m, caddr_t) = tp->t_iobc;
722 if ((flags & MSG_PEEK) == 0)
723 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
724 COMMON_END(PRU_RCVOOB);
727 /* xxx - should be const */
728 struct pr_usrreqs tcp_usrreqs = {
729 tcp_usr_abort, tcp_usr_accept, tcp_usr_attach, tcp_usr_bind,
730 tcp_usr_connect, pru_connect2_notsupp, in_control, tcp_usr_detach,
731 tcp_usr_disconnect, tcp_usr_listen, in_setpeeraddr, tcp_usr_rcvd,
732 tcp_usr_rcvoob, tcp_usr_send, pru_sense_null, tcp_usr_shutdown,
733 in_setsockaddr, sosend, soreceive, sopoll
737 struct pr_usrreqs tcp6_usrreqs = {
738 tcp_usr_abort, tcp6_usr_accept, tcp_usr_attach, tcp6_usr_bind,
739 tcp6_usr_connect, pru_connect2_notsupp, in6_control, tcp_usr_detach,
740 tcp_usr_disconnect, tcp6_usr_listen, in6_mapped_peeraddr, tcp_usr_rcvd,
741 tcp_usr_rcvoob, tcp_usr_send, pru_sense_null, tcp_usr_shutdown,
742 in6_mapped_sockaddr, sosend, soreceive, sopoll
747 tcp_connect_oncpu(struct tcpcb *tp, struct sockaddr_in *sin,
748 struct sockaddr_in *if_sin)
750 struct inpcb *inp = tp->t_inpcb, *oinp;
751 struct socket *so = inp->inp_socket;
753 struct rmxp_tao *taop;
754 struct rmxp_tao tao_noncached;
756 oinp = in_pcblookup_hash(&tcbinfo[mycpu->gd_cpuid],
757 sin->sin_addr, sin->sin_port,
758 inp->inp_laddr.s_addr != INADDR_ANY ?
759 inp->inp_laddr : if_sin->sin_addr,
760 inp->inp_lport, 0, NULL);
762 if (oinp != inp && (otp = intotcpcb(oinp)) != NULL &&
763 otp->t_state == TCPS_TIME_WAIT &&
764 (ticks - otp->t_starttime) < tcp_msl &&
765 (otp->t_flags & TF_RCVD_CC))
766 (void) tcp_close(otp);
770 if (inp->inp_laddr.s_addr == INADDR_ANY)
771 inp->inp_laddr = if_sin->sin_addr;
772 inp->inp_faddr = sin->sin_addr;
773 inp->inp_fport = sin->sin_port;
774 inp->inp_cpcbinfo = &tcbinfo[mycpu->gd_cpuid];
775 in_pcbinsconnhash(inp);
777 /* Compute window scaling to request. */
778 while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
779 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
780 tp->request_r_scale++;
783 tcpstat.tcps_connattempt++;
784 tp->t_state = TCPS_SYN_SENT;
785 callout_reset(tp->tt_keep, tcp_keepinit, tcp_timer_keep, tp);
786 tp->iss = tcp_new_isn(tp);
787 tp->t_bw_rtseq = tp->iss;
791 * Generate a CC value for this connection and
792 * check whether CC or CCnew should be used.
794 if ((taop = tcp_gettaocache(&tp->t_inpcb->inp_inc)) == NULL) {
795 taop = &tao_noncached;
796 bzero(taop, sizeof(*taop));
799 tp->cc_send = CC_INC(tcp_ccgen);
800 if (taop->tao_ccsent != 0 &&
801 CC_GEQ(tp->cc_send, taop->tao_ccsent)) {
802 taop->tao_ccsent = tp->cc_send;
804 taop->tao_ccsent = 0;
805 tp->t_flags |= TF_SENDCCNEW;
813 struct netmsg_tcp_connect {
814 struct lwkt_msg nm_lmsg;
816 struct sockaddr_in *nm_sin;
817 struct sockaddr_in *nm_ifsin;
821 tcp_connect_handler(lwkt_msg_t lmsg)
823 struct netmsg_tcp_connect *msg = (void *)lmsg;
826 error = tcp_connect_oncpu(msg->nm_tp, msg->nm_sin, msg->nm_ifsin);
827 lwkt_replymsg(lmsg, error);
834 * Common subroutine to open a TCP connection to remote host specified
835 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local
836 * port number if needed. Call in_pcbladdr to do the routing and to choose
837 * a local host address (interface). If there is an existing incarnation
838 * of the same connection in TIME-WAIT state and if the remote host was
839 * sending CC options and if the connection duration was < MSL, then
840 * truncate the previous TIME-WAIT state and proceed.
841 * Initialize connection parameters and enter SYN-SENT state.
844 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
846 struct inpcb *inp = tp->t_inpcb;
847 struct sockaddr_in *sin = (struct sockaddr_in *)nam;
848 struct sockaddr_in *if_sin;
854 if (inp->inp_lport == 0) {
855 error = in_pcbbind(inp, (struct sockaddr *)NULL, td);
861 * Cannot simply call in_pcbconnect, because there might be an
862 * earlier incarnation of this same connection still in
863 * TIME_WAIT state, creating an ADDRINUSE error.
865 error = in_pcbladdr(inp, nam, &if_sin);
870 port = tcp_addrport(sin->sin_addr.s_addr, sin->sin_port,
871 inp->inp_laddr.s_addr ?
872 inp->inp_laddr.s_addr : if_sin->sin_addr.s_addr,
875 if (port->mp_td != curthread) {
876 struct netmsg_tcp_connect msg;
878 lwkt_initmsg(&msg.nm_lmsg, &curthread->td_msgport, 0,
879 lwkt_cmd_func(tcp_connect_handler), lwkt_cmd_op_none);
882 msg.nm_ifsin = if_sin;
883 error = lwkt_domsg(port, &msg.nm_lmsg);
886 error = tcp_connect_oncpu(tp, sin, if_sin);
893 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
895 struct inpcb *inp = tp->t_inpcb, *oinp;
896 struct socket *so = inp->inp_socket;
898 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
899 struct in6_addr *addr6;
900 struct rmxp_tao *taop;
901 struct rmxp_tao tao_noncached;
904 if (inp->inp_lport == 0) {
905 error = in6_pcbbind(inp, (struct sockaddr *)0, td);
911 * Cannot simply call in_pcbconnect, because there might be an
912 * earlier incarnation of this same connection still in
913 * TIME_WAIT state, creating an ADDRINUSE error.
915 error = in6_pcbladdr(inp, nam, &addr6);
918 oinp = in6_pcblookup_hash(inp->inp_cpcbinfo,
919 &sin6->sin6_addr, sin6->sin6_port,
920 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) ?
921 addr6 : &inp->in6p_laddr,
922 inp->inp_lport, 0, NULL);
924 if (oinp != inp && (otp = intotcpcb(oinp)) != NULL &&
925 otp->t_state == TCPS_TIME_WAIT &&
926 (ticks - otp->t_starttime) < tcp_msl &&
927 (otp->t_flags & TF_RCVD_CC))
928 otp = tcp_close(otp);
932 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
933 inp->in6p_laddr = *addr6;
934 inp->in6p_faddr = sin6->sin6_addr;
935 inp->inp_fport = sin6->sin6_port;
936 if ((sin6->sin6_flowinfo & IPV6_FLOWINFO_MASK) != NULL)
937 inp->in6p_flowinfo = sin6->sin6_flowinfo;
938 in_pcbinsconnhash(inp);
940 /* Compute window scaling to request. */
941 while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
942 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
943 tp->request_r_scale++;
946 tcpstat.tcps_connattempt++;
947 tp->t_state = TCPS_SYN_SENT;
948 callout_reset(tp->tt_keep, tcp_keepinit, tcp_timer_keep, tp);
949 tp->iss = tcp_new_isn(tp);
950 tp->t_bw_rtseq = tp->iss;
954 * Generate a CC value for this connection and
955 * check whether CC or CCnew should be used.
957 if ((taop = tcp_gettaocache(&tp->t_inpcb->inp_inc)) == NULL) {
958 taop = &tao_noncached;
959 bzero(taop, sizeof(*taop));
962 tp->cc_send = CC_INC(tcp_ccgen);
963 if (taop->tao_ccsent != 0 &&
964 CC_GEQ(tp->cc_send, taop->tao_ccsent)) {
965 taop->tao_ccsent = tp->cc_send;
967 taop->tao_ccsent = 0;
968 tp->t_flags |= TF_SENDCCNEW;
976 * The new sockopt interface makes it possible for us to block in the
977 * copyin/out step (if we take a page fault). Taking a page fault at
978 * splnet() is probably a Bad Thing. (Since sockets and pcbs both now
979 * use TSM, there probably isn't any need for this function to run at
980 * splnet() any more. This needs more examination.)
983 tcp_ctloutput(so, sopt)
985 struct sockopt *sopt;
987 int error, opt, optval, s;
992 s = splnet(); /* XXX */
998 if (sopt->sopt_level != IPPROTO_TCP) {
1000 if (INP_CHECK_SOCKAF(so, AF_INET6))
1001 error = ip6_ctloutput(so, sopt);
1004 error = ip_ctloutput(so, sopt);
1008 tp = intotcpcb(inp);
1010 switch (sopt->sopt_dir) {
1012 switch (sopt->sopt_name) {
1015 error = sooptcopyin(sopt, &optval, sizeof optval,
1020 switch (sopt->sopt_name) {
1028 opt = 0; /* dead code to fool gcc */
1035 tp->t_flags &= ~opt;
1039 error = sooptcopyin(sopt, &optval, sizeof optval,
1045 tp->t_flags |= TF_NOPUSH;
1047 tp->t_flags &= ~TF_NOPUSH;
1048 error = tcp_output(tp);
1053 error = sooptcopyin(sopt, &optval, sizeof optval,
1058 if (optval > 0 && optval <= tp->t_maxseg)
1059 tp->t_maxseg = optval;
1065 error = ENOPROTOOPT;
1071 switch (sopt->sopt_name) {
1073 optval = tp->t_flags & TF_NODELAY;
1076 optval = tp->t_maxseg;
1079 optval = tp->t_flags & TF_NOOPT;
1082 optval = tp->t_flags & TF_NOPUSH;
1085 error = ENOPROTOOPT;
1089 error = sooptcopyout(sopt, &optval, sizeof optval);
1097 * tcp_sendspace and tcp_recvspace are the default send and receive window
1098 * sizes, respectively. These are obsolescent (this information should
1099 * be set by the route).
1101 u_long tcp_sendspace = 1024*32;
1102 SYSCTL_INT(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW,
1103 &tcp_sendspace , 0, "Maximum outgoing TCP datagram size");
1104 u_long tcp_recvspace = 57344; /* largest multiple of PAGE_SIZE < 64k */
1105 SYSCTL_INT(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
1106 &tcp_recvspace , 0, "Maximum incoming TCP datagram size");
1109 * Attach TCP protocol to socket, allocating
1110 * internet protocol control block, tcp control block,
1111 * bufer space, and entering LISTEN state if to accept connections.
1114 tcp_attach(struct socket *so, struct pru_attach_info *ai)
1121 int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6) != NULL;
1124 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1125 error = soreserve(so, tcp_sendspace, tcp_recvspace,
1130 cpu = mycpu->gd_cpuid;
1131 error = in_pcballoc(so, &tcbinfo[cpu]);
1134 inp = sotoinpcb(so);
1137 inp->inp_vflag |= INP_IPV6;
1138 inp->in6p_hops = -1; /* use kernel default */
1142 inp->inp_vflag |= INP_IPV4;
1143 tp = tcp_newtcpcb(inp);
1145 int nofd = so->so_state & SS_NOFDREF; /* XXX */
1147 so->so_state &= ~SS_NOFDREF; /* don't free the socket yet */
1154 so->so_state |= nofd;
1157 tp->t_state = TCPS_CLOSED;
1162 * Initiate (or continue) disconnect.
1163 * If embryonic state, just send reset (once).
1164 * If in ``let data drain'' option and linger null, just drop.
1165 * Otherwise (hard), mark socket disconnecting and drop
1166 * current input data; switch states based on user close, and
1167 * send segment to peer (with FIN).
1169 static struct tcpcb *
1173 struct socket *so = tp->t_inpcb->inp_socket;
1175 if (tp->t_state < TCPS_ESTABLISHED)
1177 else if ((so->so_options & SO_LINGER) && so->so_linger == 0)
1178 tp = tcp_drop(tp, 0);
1180 soisdisconnecting(so);
1181 sbflush(&so->so_rcv);
1182 tp = tcp_usrclosed(tp);
1184 (void) tcp_output(tp);
1190 * User issued close, and wish to trail through shutdown states:
1191 * if never received SYN, just forget it. If got a SYN from peer,
1192 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
1193 * If already got a FIN from peer, then almost done; go to LAST_ACK
1194 * state. In all other cases, have already sent FIN to peer (e.g.
1195 * after PRU_SHUTDOWN), and just have to play tedious game waiting
1196 * for peer to send FIN or not respond to keep-alives, etc.
1197 * We can let the user exit from the close as soon as the FIN is acked.
1199 static struct tcpcb *
1204 switch (tp->t_state) {
1208 tp->t_state = TCPS_CLOSED;
1213 case TCPS_SYN_RECEIVED:
1214 tp->t_flags |= TF_NEEDFIN;
1217 case TCPS_ESTABLISHED:
1218 tp->t_state = TCPS_FIN_WAIT_1;
1221 case TCPS_CLOSE_WAIT:
1222 tp->t_state = TCPS_LAST_ACK;
1225 if (tp && tp->t_state >= TCPS_FIN_WAIT_2) {
1226 soisdisconnected(tp->t_inpcb->inp_socket);
1227 /* To prevent the connection hanging in FIN_WAIT_2 forever. */
1228 if (tp->t_state == TCPS_FIN_WAIT_2)
1229 callout_reset(tp->tt_2msl, tcp_maxidle,
1230 tcp_timer_2msl, tp);