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 1.26 2004/08/11 02:36:22 dillon 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/msgport2.h>
111 #include <net/netisr.h>
112 #include <net/route.h>
114 #include <netinet/in.h>
115 #include <netinet/in_systm.h>
117 #include <netinet/ip6.h>
119 #include <netinet/in_pcb.h>
121 #include <netinet6/in6_pcb.h>
123 #include <netinet/in_var.h>
124 #include <netinet/ip_var.h>
126 #include <netinet6/ip6_var.h>
128 #include <netinet/tcp.h>
129 #include <netinet/tcp_fsm.h>
130 #include <netinet/tcp_seq.h>
131 #include <netinet/tcp_timer.h>
132 #include <netinet/tcp_var.h>
133 #include <netinet/tcpip.h>
135 #include <netinet/tcp_debug.h>
139 #include <netinet6/ipsec.h>
143 * TCP protocol interface to socket abstraction.
145 extern char *tcpstates[]; /* XXX ??? */
147 static int tcp_attach (struct socket *, struct pru_attach_info *);
148 static int tcp_connect (struct tcpcb *, struct sockaddr *,
151 static int tcp6_connect (struct tcpcb *, struct sockaddr *,
154 static struct tcpcb *
155 tcp_disconnect (struct tcpcb *);
156 static struct tcpcb *
157 tcp_usrclosed (struct tcpcb *);
160 #define TCPDEBUG0 int ostate = 0
161 #define TCPDEBUG1() ostate = tp ? tp->t_state : 0
162 #define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \
163 tcp_trace(TA_USER, ostate, tp, 0, 0, req)
167 #define TCPDEBUG2(req)
171 * TCP attaches to socket via pru_attach(), reserving space,
172 * and an internet control block.
175 tcp_usr_attach(struct socket *so, int proto, struct pru_attach_info *ai)
179 struct inpcb *inp = sotoinpcb(so);
180 struct tcpcb *tp = 0;
189 error = tcp_attach(so, ai);
193 if ((so->so_options & SO_LINGER) && so->so_linger == 0)
194 so->so_linger = TCP_LINGERTIME;
197 TCPDEBUG2(PRU_ATTACH);
203 * pru_detach() detaches the TCP protocol from the socket.
204 * If the protocol state is non-embryonic, then can't
205 * do this directly: have to initiate a pru_disconnect(),
206 * which may finish later; embryonic TCB's can just
210 tcp_usr_detach(struct socket *so)
214 struct inpcb *inp = sotoinpcb(so);
220 return EINVAL; /* XXX */
224 tp = tcp_disconnect(tp);
226 TCPDEBUG2(PRU_DETACH);
231 #define COMMON_START() TCPDEBUG0; \
237 tp = intotcpcb(inp); \
241 #define COMMON_END(req) out: TCPDEBUG2(req); splx(s); return error; goto out
245 * Give the socket an address.
248 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
252 struct inpcb *inp = sotoinpcb(so);
254 struct sockaddr_in *sinp;
259 * Must check for multicast addresses and disallow binding
262 sinp = (struct sockaddr_in *)nam;
263 if (sinp->sin_family == AF_INET &&
264 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
265 error = EAFNOSUPPORT;
268 error = in_pcbbind(inp, nam, td);
271 COMMON_END(PRU_BIND);
277 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
281 struct inpcb *inp = sotoinpcb(so);
283 struct sockaddr_in6 *sin6p;
288 * Must check for multicast addresses and disallow binding
291 sin6p = (struct sockaddr_in6 *)nam;
292 if (sin6p->sin6_family == AF_INET6 &&
293 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
294 error = EAFNOSUPPORT;
297 inp->inp_vflag &= ~INP_IPV4;
298 inp->inp_vflag |= INP_IPV6;
299 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
300 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr))
301 inp->inp_vflag |= INP_IPV4;
302 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
303 struct sockaddr_in sin;
305 in6_sin6_2_sin(&sin, sin6p);
306 inp->inp_vflag |= INP_IPV4;
307 inp->inp_vflag &= ~INP_IPV6;
308 error = in_pcbbind(inp, (struct sockaddr *)&sin, td);
312 error = in6_pcbbind(inp, nam, td);
315 COMMON_END(PRU_BIND);
320 struct netmsg_inswildcard {
321 struct lwkt_msg nm_lmsg;
322 struct inpcb *nm_inp;
323 struct inpcbinfo *nm_pcbinfo;
327 in_pcbinswildcardhash_handler(struct lwkt_msg *msg0)
329 struct netmsg_inswildcard *msg = (struct netmsg_inswildcard *)msg0;
331 in_pcbinswildcardhash_oncpu(msg->nm_inp, msg->nm_pcbinfo);
332 lwkt_replymsg(&msg->nm_lmsg, 0);
338 * Prepare to accept connections.
341 tcp_usr_listen(struct socket *so, struct thread *td)
345 struct inpcb *inp = sotoinpcb(so);
352 if (inp->inp_lport == 0) {
353 error = in_pcbbind(inp, NULL, td);
358 tp->t_state = TCPS_LISTEN;
361 * We have to set the flag because we can't have other cpus messing
362 * with our inp's flags.
364 inp->inp_flags |= INP_WILDCARD_MP;
365 for (cpu = 0; cpu < ncpus2; cpu++) {
366 struct netmsg_inswildcard *msg;
368 if (cpu == mycpu->gd_cpuid) {
369 in_pcbinswildcardhash_oncpu(inp, &tcbinfo[cpu]);
373 msg = malloc(sizeof(struct netmsg_inswildcard), M_LWKTMSG,
375 lwkt_initmsg(&msg->nm_lmsg, &netisr_afree_rport, 0,
376 lwkt_cmd_func(in_pcbinswildcardhash_handler),
379 msg->nm_pcbinfo = &tcbinfo[cpu];
380 lwkt_sendmsg(tcp_cport(cpu), &msg->nm_lmsg);
383 in_pcbinswildcardhash(inp);
385 COMMON_END(PRU_LISTEN);
390 tcp6_usr_listen(struct socket *so, struct thread *td)
394 struct inpcb *inp = sotoinpcb(so);
398 if (inp->inp_lport == 0) {
399 inp->inp_vflag &= ~INP_IPV4;
400 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
401 inp->inp_vflag |= INP_IPV4;
402 error = in6_pcbbind(inp, (struct sockaddr *)0, td);
405 tp->t_state = TCPS_LISTEN;
406 in_pcbinswildcardhash(inp);
407 COMMON_END(PRU_LISTEN);
412 * Initiate connection to peer.
413 * Create a template for use in transmissions on this connection.
414 * Enter SYN_SENT state, and mark socket as connecting.
415 * Start keep-alive timer, and seed output sequence space.
416 * Send initial segment on connection.
419 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
423 struct inpcb *inp = sotoinpcb(so);
425 struct sockaddr_in *sinp;
430 * Must disallow TCP ``connections'' to multicast addresses.
432 sinp = (struct sockaddr_in *)nam;
433 if (sinp->sin_family == AF_INET
434 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
435 error = EAFNOSUPPORT;
439 prison_remote_ip(td, 0, &sinp->sin_addr.s_addr);
441 if ((error = tcp_connect(tp, nam, td)) != 0)
443 error = tcp_output(tp);
444 COMMON_END(PRU_CONNECT);
449 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
453 struct inpcb *inp = sotoinpcb(so);
455 struct sockaddr_in6 *sin6p;
460 * Must disallow TCP ``connections'' to multicast addresses.
462 sin6p = (struct sockaddr_in6 *)nam;
463 if (sin6p->sin6_family == AF_INET6
464 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
465 error = EAFNOSUPPORT;
469 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
470 struct sockaddr_in sin;
472 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
477 in6_sin6_2_sin(&sin, sin6p);
478 inp->inp_vflag |= INP_IPV4;
479 inp->inp_vflag &= ~INP_IPV6;
480 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0)
482 error = tcp_output(tp);
485 inp->inp_vflag &= ~INP_IPV4;
486 inp->inp_vflag |= INP_IPV6;
487 inp->inp_inc.inc_isipv6 = 1;
488 if ((error = tcp6_connect(tp, nam, td)) != 0)
490 error = tcp_output(tp);
491 COMMON_END(PRU_CONNECT);
496 * Initiate disconnect from peer.
497 * If connection never passed embryonic stage, just drop;
498 * else if don't need to let data drain, then can just drop anyways,
499 * else have to begin TCP shutdown process: mark socket disconnecting,
500 * drain unread data, state switch to reflect user close, and
501 * send segment (e.g. FIN) to peer. Socket will be really disconnected
502 * when peer sends FIN and acks ours.
504 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
507 tcp_usr_disconnect(struct socket *so)
511 struct inpcb *inp = sotoinpcb(so);
515 tp = tcp_disconnect(tp);
516 COMMON_END(PRU_DISCONNECT);
520 * Accept a connection. Essentially all the work is
521 * done at higher levels; just return the address
522 * of the peer, storing through addr.
525 tcp_usr_accept(struct socket *so, struct sockaddr **nam)
529 struct inpcb *inp = sotoinpcb(so);
530 struct tcpcb *tp = NULL;
533 if (so->so_state & SS_ISDISCONNECTED) {
534 error = ECONNABORTED;
543 in_setpeeraddr(so, nam);
544 COMMON_END(PRU_ACCEPT);
549 tcp6_usr_accept(struct socket *so, struct sockaddr **nam)
553 struct inpcb *inp = sotoinpcb(so);
554 struct tcpcb *tp = NULL;
557 if (so->so_state & SS_ISDISCONNECTED) {
558 error = ECONNABORTED;
567 in6_mapped_peeraddr(so, nam);
568 COMMON_END(PRU_ACCEPT);
572 * Mark the connection as being incapable of further output.
575 tcp_usr_shutdown(struct socket *so)
579 struct inpcb *inp = sotoinpcb(so);
584 tp = tcp_usrclosed(tp);
586 error = tcp_output(tp);
587 COMMON_END(PRU_SHUTDOWN);
591 * After a receive, possibly send window update to peer.
594 tcp_usr_rcvd(struct socket *so, int flags)
598 struct inpcb *inp = sotoinpcb(so);
603 COMMON_END(PRU_RCVD);
607 * Do a send by putting data in output queue and updating urgent
608 * marker if URG set. Possibly send more data. Unlike the other
609 * pru_*() routines, the mbuf chains are our responsibility. We
610 * must either enqueue them or free them. The other pru_* routines
611 * generally are caller-frees.
614 tcp_usr_send(struct socket *so, int flags, struct mbuf *m,
615 struct sockaddr *nam, struct mbuf *control, struct thread *td)
619 struct inpcb *inp = sotoinpcb(so);
628 * OOPS! we lost a race, the TCP session got reset after
629 * we checked SS_CANTSENDMORE, eg: while doing uiomove or a
630 * network interrupt in the non-splnet() section of sosend().
636 error = ECONNRESET; /* XXX EPIPE? */
642 isipv6 = nam && nam->sa_family == AF_INET6;
647 /* TCP doesn't do control messages (rights, creds, etc) */
648 if (control->m_len) {
655 m_freem(control); /* empty control, just free it */
657 if(!(flags & PRUS_OOB)) {
658 sbappend(&so->so_snd, m);
659 if (nam && tp->t_state < TCPS_SYN_SENT) {
661 * Do implied connect if not yet connected,
662 * initialize window to default value, and
663 * initialize maxseg/maxopd using peer's cached
668 error = tcp6_connect(tp, nam, td);
671 error = tcp_connect(tp, nam, td);
674 tp->snd_wnd = TTCP_CLIENT_SND_WND;
678 if (flags & PRUS_EOF) {
680 * Close the send side of the connection after
684 tp = tcp_usrclosed(tp);
687 if (flags & PRUS_MORETOCOME)
688 tp->t_flags |= TF_MORETOCOME;
689 error = tcp_output(tp);
690 if (flags & PRUS_MORETOCOME)
691 tp->t_flags &= ~TF_MORETOCOME;
694 if (sbspace(&so->so_snd) < -512) {
700 * According to RFC961 (Assigned Protocols),
701 * the urgent pointer points to the last octet
702 * of urgent data. We continue, however,
703 * to consider it to indicate the first octet
704 * of data past the urgent section.
705 * Otherwise, snd_up should be one lower.
707 sbappend(&so->so_snd, m);
708 if (nam && tp->t_state < TCPS_SYN_SENT) {
710 * Do implied connect if not yet connected,
711 * initialize window to default value, and
712 * initialize maxseg/maxopd using peer's cached
717 error = tcp6_connect(tp, nam, td);
720 error = tcp_connect(tp, nam, td);
723 tp->snd_wnd = TTCP_CLIENT_SND_WND;
726 tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
727 tp->t_flags |= TF_FORCE;
728 error = tcp_output(tp);
729 tp->t_flags &= ~TF_FORCE;
731 COMMON_END((flags & PRUS_OOB) ? PRU_SENDOOB :
732 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
739 tcp_usr_abort(struct socket *so)
743 struct inpcb *inp = sotoinpcb(so);
747 tp = tcp_drop(tp, ECONNABORTED);
748 COMMON_END(PRU_ABORT);
752 * Receive out-of-band data.
755 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags)
759 struct inpcb *inp = sotoinpcb(so);
763 if ((so->so_oobmark == 0 &&
764 (so->so_state & SS_RCVATMARK) == 0) ||
765 so->so_options & SO_OOBINLINE ||
766 tp->t_oobflags & TCPOOB_HADDATA) {
770 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
775 *mtod(m, caddr_t) = tp->t_iobc;
776 if ((flags & MSG_PEEK) == 0)
777 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
778 COMMON_END(PRU_RCVOOB);
781 /* xxx - should be const */
782 struct pr_usrreqs tcp_usrreqs = {
783 tcp_usr_abort, tcp_usr_accept, tcp_usr_attach, tcp_usr_bind,
784 tcp_usr_connect, pru_connect2_notsupp, in_control, tcp_usr_detach,
785 tcp_usr_disconnect, tcp_usr_listen, in_setpeeraddr, tcp_usr_rcvd,
786 tcp_usr_rcvoob, tcp_usr_send, pru_sense_null, tcp_usr_shutdown,
787 in_setsockaddr, sosend, soreceive, sopoll
791 struct pr_usrreqs tcp6_usrreqs = {
792 tcp_usr_abort, tcp6_usr_accept, tcp_usr_attach, tcp6_usr_bind,
793 tcp6_usr_connect, pru_connect2_notsupp, in6_control, tcp_usr_detach,
794 tcp_usr_disconnect, tcp6_usr_listen, in6_mapped_peeraddr, tcp_usr_rcvd,
795 tcp_usr_rcvoob, tcp_usr_send, pru_sense_null, tcp_usr_shutdown,
796 in6_mapped_sockaddr, sosend, soreceive, sopoll
801 tcp_connect_oncpu(struct tcpcb *tp, struct sockaddr_in *sin,
802 struct sockaddr_in *if_sin)
804 struct inpcb *inp = tp->t_inpcb, *oinp;
805 struct socket *so = inp->inp_socket;
807 struct rmxp_tao *taop;
808 struct rmxp_tao tao_noncached;
810 oinp = in_pcblookup_hash(&tcbinfo[mycpu->gd_cpuid],
811 sin->sin_addr, sin->sin_port,
812 inp->inp_laddr.s_addr != INADDR_ANY ?
813 inp->inp_laddr : if_sin->sin_addr,
814 inp->inp_lport, 0, NULL);
816 if (oinp != inp && (otp = intotcpcb(oinp)) != NULL &&
817 otp->t_state == TCPS_TIME_WAIT &&
818 (ticks - otp->t_starttime) < tcp_msl &&
819 (otp->t_flags & TF_RCVD_CC))
820 (void) tcp_close(otp);
824 if (inp->inp_laddr.s_addr == INADDR_ANY)
825 inp->inp_laddr = if_sin->sin_addr;
826 inp->inp_faddr = sin->sin_addr;
827 inp->inp_fport = sin->sin_port;
828 inp->inp_cpcbinfo = &tcbinfo[mycpu->gd_cpuid];
829 in_pcbinsconnhash(inp);
831 /* Compute window scaling to request. */
832 while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
833 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
834 tp->request_r_scale++;
837 tcpstat.tcps_connattempt++;
838 tp->t_state = TCPS_SYN_SENT;
839 callout_reset(tp->tt_keep, tcp_keepinit, tcp_timer_keep, tp);
840 tp->iss = tcp_new_isn(tp);
841 tp->t_bw_rtseq = tp->iss;
845 * Generate a CC value for this connection and
846 * check whether CC or CCnew should be used.
848 if ((taop = tcp_gettaocache(&tp->t_inpcb->inp_inc)) == NULL) {
849 taop = &tao_noncached;
850 bzero(taop, sizeof(*taop));
853 tp->cc_send = CC_INC(tcp_ccgen);
854 if (taop->tao_ccsent != 0 &&
855 CC_GEQ(tp->cc_send, taop->tao_ccsent)) {
856 taop->tao_ccsent = tp->cc_send;
858 taop->tao_ccsent = 0;
859 tp->t_flags |= TF_SENDCCNEW;
867 struct netmsg_tcp_connect {
868 struct lwkt_msg nm_lmsg;
870 struct sockaddr_in *nm_sin;
871 struct sockaddr_in *nm_ifsin;
875 tcp_connect_handler(lwkt_msg_t lmsg)
877 struct netmsg_tcp_connect *msg = (void *)lmsg;
880 error = tcp_connect_oncpu(msg->nm_tp, msg->nm_sin, msg->nm_ifsin);
881 lwkt_replymsg(lmsg, error);
888 * Common subroutine to open a TCP connection to remote host specified
889 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local
890 * port number if needed. Call in_pcbladdr to do the routing and to choose
891 * a local host address (interface). If there is an existing incarnation
892 * of the same connection in TIME-WAIT state and if the remote host was
893 * sending CC options and if the connection duration was < MSL, then
894 * truncate the previous TIME-WAIT state and proceed.
895 * Initialize connection parameters and enter SYN-SENT state.
898 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
900 struct inpcb *inp = tp->t_inpcb;
901 struct sockaddr_in *sin = (struct sockaddr_in *)nam;
902 struct sockaddr_in *if_sin;
908 if (inp->inp_lport == 0) {
909 error = in_pcbbind(inp, (struct sockaddr *)NULL, td);
915 * Cannot simply call in_pcbconnect, because there might be an
916 * earlier incarnation of this same connection still in
917 * TIME_WAIT state, creating an ADDRINUSE error.
919 error = in_pcbladdr(inp, nam, &if_sin);
924 port = tcp_addrport(sin->sin_addr.s_addr, sin->sin_port,
925 inp->inp_laddr.s_addr ?
926 inp->inp_laddr.s_addr : if_sin->sin_addr.s_addr,
929 if (port->mp_td != curthread) {
930 struct netmsg_tcp_connect msg;
932 lwkt_initmsg(&msg.nm_lmsg, &curthread->td_msgport, 0,
933 lwkt_cmd_func(tcp_connect_handler), lwkt_cmd_op_none);
936 msg.nm_ifsin = if_sin;
937 error = lwkt_domsg(port, &msg.nm_lmsg);
940 error = tcp_connect_oncpu(tp, sin, if_sin);
947 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
949 struct inpcb *inp = tp->t_inpcb, *oinp;
950 struct socket *so = inp->inp_socket;
952 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
953 struct in6_addr *addr6;
954 struct rmxp_tao *taop;
955 struct rmxp_tao tao_noncached;
958 if (inp->inp_lport == 0) {
959 error = in6_pcbbind(inp, (struct sockaddr *)0, td);
965 * Cannot simply call in_pcbconnect, because there might be an
966 * earlier incarnation of this same connection still in
967 * TIME_WAIT state, creating an ADDRINUSE error.
969 error = in6_pcbladdr(inp, nam, &addr6);
972 oinp = in6_pcblookup_hash(inp->inp_cpcbinfo,
973 &sin6->sin6_addr, sin6->sin6_port,
974 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) ?
975 addr6 : &inp->in6p_laddr,
976 inp->inp_lport, 0, NULL);
978 if (oinp != inp && (otp = intotcpcb(oinp)) != NULL &&
979 otp->t_state == TCPS_TIME_WAIT &&
980 (ticks - otp->t_starttime) < tcp_msl &&
981 (otp->t_flags & TF_RCVD_CC))
982 otp = tcp_close(otp);
986 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
987 inp->in6p_laddr = *addr6;
988 inp->in6p_faddr = sin6->sin6_addr;
989 inp->inp_fport = sin6->sin6_port;
990 if ((sin6->sin6_flowinfo & IPV6_FLOWINFO_MASK) != NULL)
991 inp->in6p_flowinfo = sin6->sin6_flowinfo;
992 in_pcbinsconnhash(inp);
994 /* Compute window scaling to request. */
995 while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
996 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
997 tp->request_r_scale++;
1000 tcpstat.tcps_connattempt++;
1001 tp->t_state = TCPS_SYN_SENT;
1002 callout_reset(tp->tt_keep, tcp_keepinit, tcp_timer_keep, tp);
1003 tp->iss = tcp_new_isn(tp);
1004 tp->t_bw_rtseq = tp->iss;
1005 tcp_sendseqinit(tp);
1008 * Generate a CC value for this connection and
1009 * check whether CC or CCnew should be used.
1011 if ((taop = tcp_gettaocache(&tp->t_inpcb->inp_inc)) == NULL) {
1012 taop = &tao_noncached;
1013 bzero(taop, sizeof(*taop));
1016 tp->cc_send = CC_INC(tcp_ccgen);
1017 if (taop->tao_ccsent != 0 &&
1018 CC_GEQ(tp->cc_send, taop->tao_ccsent)) {
1019 taop->tao_ccsent = tp->cc_send;
1021 taop->tao_ccsent = 0;
1022 tp->t_flags |= TF_SENDCCNEW;
1030 * The new sockopt interface makes it possible for us to block in the
1031 * copyin/out step (if we take a page fault). Taking a page fault at
1032 * splnet() is probably a Bad Thing. (Since sockets and pcbs both now
1033 * use TSM, there probably isn't any need for this function to run at
1034 * splnet() any more. This needs more examination.)
1037 tcp_ctloutput(so, sopt)
1039 struct sockopt *sopt;
1041 int error, opt, optval, s;
1046 s = splnet(); /* XXX */
1047 inp = sotoinpcb(so);
1050 return (ECONNRESET);
1052 if (sopt->sopt_level != IPPROTO_TCP) {
1054 if (INP_CHECK_SOCKAF(so, AF_INET6))
1055 error = ip6_ctloutput(so, sopt);
1058 error = ip_ctloutput(so, sopt);
1062 tp = intotcpcb(inp);
1064 switch (sopt->sopt_dir) {
1066 switch (sopt->sopt_name) {
1069 error = sooptcopyin(sopt, &optval, sizeof optval,
1074 switch (sopt->sopt_name) {
1082 opt = 0; /* dead code to fool gcc */
1089 tp->t_flags &= ~opt;
1093 error = sooptcopyin(sopt, &optval, sizeof optval,
1099 tp->t_flags |= TF_NOPUSH;
1101 tp->t_flags &= ~TF_NOPUSH;
1102 error = tcp_output(tp);
1107 error = sooptcopyin(sopt, &optval, sizeof optval,
1112 if (optval > 0 && optval <= tp->t_maxseg)
1113 tp->t_maxseg = optval;
1119 error = ENOPROTOOPT;
1125 switch (sopt->sopt_name) {
1127 optval = tp->t_flags & TF_NODELAY;
1130 optval = tp->t_maxseg;
1133 optval = tp->t_flags & TF_NOOPT;
1136 optval = tp->t_flags & TF_NOPUSH;
1139 error = ENOPROTOOPT;
1143 error = sooptcopyout(sopt, &optval, sizeof optval);
1151 * tcp_sendspace and tcp_recvspace are the default send and receive window
1152 * sizes, respectively. These are obsolescent (this information should
1153 * be set by the route).
1155 u_long tcp_sendspace = 1024*32;
1156 SYSCTL_INT(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW,
1157 &tcp_sendspace , 0, "Maximum outgoing TCP datagram size");
1158 u_long tcp_recvspace = 57344; /* largest multiple of PAGE_SIZE < 64k */
1159 SYSCTL_INT(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
1160 &tcp_recvspace , 0, "Maximum incoming TCP datagram size");
1163 * Attach TCP protocol to socket, allocating
1164 * internet protocol control block, tcp control block,
1165 * bufer space, and entering LISTEN state if to accept connections.
1168 tcp_attach(struct socket *so, struct pru_attach_info *ai)
1175 int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6) != NULL;
1178 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1179 error = soreserve(so, tcp_sendspace, tcp_recvspace,
1184 cpu = mycpu->gd_cpuid;
1185 error = in_pcballoc(so, &tcbinfo[cpu]);
1188 inp = sotoinpcb(so);
1191 inp->inp_vflag |= INP_IPV6;
1192 inp->in6p_hops = -1; /* use kernel default */
1196 inp->inp_vflag |= INP_IPV4;
1197 tp = tcp_newtcpcb(inp);
1199 int nofd = so->so_state & SS_NOFDREF; /* XXX */
1201 so->so_state &= ~SS_NOFDREF; /* don't free the socket yet */
1208 so->so_state |= nofd;
1211 tp->t_state = TCPS_CLOSED;
1216 * Initiate (or continue) disconnect.
1217 * If embryonic state, just send reset (once).
1218 * If in ``let data drain'' option and linger null, just drop.
1219 * Otherwise (hard), mark socket disconnecting and drop
1220 * current input data; switch states based on user close, and
1221 * send segment to peer (with FIN).
1223 static struct tcpcb *
1227 struct socket *so = tp->t_inpcb->inp_socket;
1229 if (tp->t_state < TCPS_ESTABLISHED)
1231 else if ((so->so_options & SO_LINGER) && so->so_linger == 0)
1232 tp = tcp_drop(tp, 0);
1234 soisdisconnecting(so);
1235 sbflush(&so->so_rcv);
1236 tp = tcp_usrclosed(tp);
1238 (void) tcp_output(tp);
1244 * User issued close, and wish to trail through shutdown states:
1245 * if never received SYN, just forget it. If got a SYN from peer,
1246 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
1247 * If already got a FIN from peer, then almost done; go to LAST_ACK
1248 * state. In all other cases, have already sent FIN to peer (e.g.
1249 * after PRU_SHUTDOWN), and just have to play tedious game waiting
1250 * for peer to send FIN or not respond to keep-alives, etc.
1251 * We can let the user exit from the close as soon as the FIN is acked.
1253 static struct tcpcb *
1258 switch (tp->t_state) {
1262 tp->t_state = TCPS_CLOSED;
1267 case TCPS_SYN_RECEIVED:
1268 tp->t_flags |= TF_NEEDFIN;
1271 case TCPS_ESTABLISHED:
1272 tp->t_state = TCPS_FIN_WAIT_1;
1275 case TCPS_CLOSE_WAIT:
1276 tp->t_state = TCPS_LAST_ACK;
1279 if (tp && tp->t_state >= TCPS_FIN_WAIT_2) {
1280 soisdisconnected(tp->t_inpcb->inp_socket);
1281 /* To prevent the connection hanging in FIN_WAIT_2 forever. */
1282 if (tp->t_state == TCPS_FIN_WAIT_2)
1283 callout_reset(tp->tt_2msl, tcp_maxidle,
1284 tcp_timer_2msl, tp);