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
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15 * documentation and/or other materials provided with the distribution.
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39 * modification, are permitted provided that the following conditions
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66 * From: @(#)tcp_usrreq.c 8.2 (Berkeley) 1/3/94
67 * $FreeBSD: src/sys/netinet/tcp_usrreq.c,v 1.51.2.17 2002/10/11 11:46:44 ume Exp $
68 * $DragonFly: src/sys/netinet/tcp_usrreq.c,v 1.51 2008/09/29 20:52:23 dillon Exp $
71 #include "opt_ipsec.h"
73 #include "opt_inet6.h"
74 #include "opt_tcpdebug.h"
76 #include <sys/param.h>
77 #include <sys/systm.h>
78 #include <sys/kernel.h>
79 #include <sys/malloc.h>
80 #include <sys/sysctl.h>
81 #include <sys/globaldata.h>
82 #include <sys/thread.h>
86 #include <sys/domain.h>
88 #include <sys/socket.h>
89 #include <sys/socketvar.h>
90 #include <sys/protosw.h>
92 #include <sys/thread2.h>
93 #include <sys/msgport2.h>
94 #include <sys/socketvar2.h>
97 #include <net/netisr.h>
98 #include <net/route.h>
100 #include <net/netmsg2.h>
102 #include <netinet/in.h>
103 #include <netinet/in_systm.h>
105 #include <netinet/ip6.h>
107 #include <netinet/in_pcb.h>
109 #include <netinet6/in6_pcb.h>
111 #include <netinet/in_var.h>
112 #include <netinet/ip_var.h>
114 #include <netinet6/ip6_var.h>
115 #include <netinet6/tcp6_var.h>
117 #include <netinet/tcp.h>
118 #include <netinet/tcp_fsm.h>
119 #include <netinet/tcp_seq.h>
120 #include <netinet/tcp_timer.h>
121 #include <netinet/tcp_timer2.h>
122 #include <netinet/tcp_var.h>
123 #include <netinet/tcpip.h>
125 #include <netinet/tcp_debug.h>
129 #include <netinet6/ipsec.h>
133 * TCP protocol interface to socket abstraction.
135 extern char *tcpstates[]; /* XXX ??? */
137 static int tcp_attach (struct socket *, struct pru_attach_info *);
138 static void tcp_connect (netmsg_t msg);
140 static void tcp6_connect (netmsg_t msg);
141 static int tcp6_connect_oncpu(struct tcpcb *tp, int flags,
143 struct sockaddr_in6 *sin6,
144 struct in6_addr *addr6);
146 static struct tcpcb *
147 tcp_disconnect (struct tcpcb *);
148 static struct tcpcb *
149 tcp_usrclosed (struct tcpcb *);
152 #define TCPDEBUG0 int ostate = 0
153 #define TCPDEBUG1() ostate = tp ? tp->t_state : 0
154 #define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \
155 tcp_trace(TA_USER, ostate, tp, 0, 0, req)
159 #define TCPDEBUG2(req)
163 * TCP attaches to socket via pru_attach(), reserving space,
164 * and an internet control block. This is likely occuring on
165 * cpu0 and may have to move later when we bind/connect.
168 tcp_usr_attach(netmsg_t msg)
170 struct socket *so = msg->base.nm_so;
171 struct pru_attach_info *ai = msg->attach.nm_ai;
174 struct tcpcb *tp = 0;
185 error = tcp_attach(so, ai);
189 if ((so->so_options & SO_LINGER) && so->so_linger == 0)
190 so->so_linger = TCP_LINGERTIME;
193 sofree(so); /* from ref above */
194 TCPDEBUG2(PRU_ATTACH);
195 lwkt_replymsg(&msg->lmsg, error);
199 * pru_detach() detaches the TCP protocol from the socket.
200 * If the protocol state is non-embryonic, then can't
201 * do this directly: have to initiate a pru_disconnect(),
202 * which may finish later; embryonic TCB's can just
206 tcp_usr_detach(netmsg_t msg)
208 struct socket *so = msg->base.nm_so;
217 * If the inp is already detached it may have been due to an async
218 * close. Just return as if no error occured.
220 * It's possible for the tcpcb (tp) to disconnect from the inp due
221 * to tcp_drop()->tcp_close() being called. This may occur *after*
222 * the detach message has been queued so we may find a NULL tp here.
225 if ((tp = intotcpcb(inp)) != NULL) {
227 tp = tcp_disconnect(tp);
228 TCPDEBUG2(PRU_DETACH);
231 lwkt_replymsg(&msg->lmsg, error);
235 * NOTE: ignore_error is non-zero for certain disconnection races
236 * which we want to silently allow, otherwise close() may return
237 * an unexpected error.
239 * NOTE: The variables (msg) and (tp) are assumed.
241 #define COMMON_START(so, inp, ignore_error) \
247 error = ignore_error ? 0 : EINVAL; \
251 tp = intotcpcb(inp); \
255 #define COMMON_END(req) \
258 lwkt_replymsg(&msg->lmsg, error); \
263 * Give the socket an address.
266 tcp_usr_bind(netmsg_t msg)
268 struct socket *so = msg->bind.base.nm_so;
269 struct sockaddr *nam = msg->bind.nm_nam;
270 struct thread *td = msg->bind.nm_td;
274 struct sockaddr_in *sinp;
276 COMMON_START(so, inp, 0);
279 * Must check for multicast addresses and disallow binding
282 sinp = (struct sockaddr_in *)nam;
283 if (sinp->sin_family == AF_INET &&
284 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
285 error = EAFNOSUPPORT;
288 error = in_pcbbind(inp, nam, td);
291 COMMON_END(PRU_BIND);
298 tcp6_usr_bind(netmsg_t msg)
300 struct socket *so = msg->bind.base.nm_so;
301 struct sockaddr *nam = msg->bind.nm_nam;
302 struct thread *td = msg->bind.nm_td;
306 struct sockaddr_in6 *sin6p;
308 COMMON_START(so, inp, 0);
311 * Must check for multicast addresses and disallow binding
314 sin6p = (struct sockaddr_in6 *)nam;
315 if (sin6p->sin6_family == AF_INET6 &&
316 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
317 error = EAFNOSUPPORT;
320 inp->inp_vflag &= ~INP_IPV4;
321 inp->inp_vflag |= INP_IPV6;
322 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
323 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr))
324 inp->inp_vflag |= INP_IPV4;
325 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
326 struct sockaddr_in sin;
328 in6_sin6_2_sin(&sin, sin6p);
329 inp->inp_vflag |= INP_IPV4;
330 inp->inp_vflag &= ~INP_IPV6;
331 error = in_pcbbind(inp, (struct sockaddr *)&sin, td);
335 error = in6_pcbbind(inp, nam, td);
338 COMMON_END(PRU_BIND);
344 struct netmsg_inswildcard {
345 struct netmsg_base base;
346 struct inpcb *nm_inp;
350 in_pcbinswildcardhash_handler(netmsg_t msg)
352 struct netmsg_inswildcard *nm = (struct netmsg_inswildcard *)msg;
353 int cpu = mycpuid, nextcpu;
355 in_pcbinswildcardhash_oncpu(nm->nm_inp, &tcbinfo[cpu]);
358 if (nextcpu < ncpus2)
359 lwkt_forwardmsg(cpu_portfn(nextcpu), &nm->base.lmsg);
361 lwkt_replymsg(&nm->base.lmsg, 0);
367 * Prepare to accept connections.
370 tcp_usr_listen(netmsg_t msg)
372 struct socket *so = msg->listen.base.nm_so;
373 struct thread *td = msg->listen.nm_td;
378 struct netmsg_inswildcard nm;
381 COMMON_START(so, inp, 0);
383 if (tp->t_flags & TF_LISTEN)
386 if (inp->inp_lport == 0) {
387 error = in_pcbbind(inp, NULL, td);
392 tp->t_state = TCPS_LISTEN;
393 tp->t_flags |= TF_LISTEN;
394 tp->tt_msg = NULL; /* Catch any invalid timer usage */
399 * We have to set the flag because we can't have other cpus
400 * messing with our inp's flags.
402 KASSERT(!(inp->inp_flags & INP_CONNECTED),
403 ("already on connhash\n"));
404 KASSERT(!(inp->inp_flags & INP_WILDCARD),
405 ("already on wildcardhash\n"));
406 KASSERT(!(inp->inp_flags & INP_WILDCARD_MP),
407 ("already on MP wildcardhash\n"));
408 inp->inp_flags |= INP_WILDCARD_MP;
410 KKASSERT(so->so_port == cpu_portfn(0));
411 KKASSERT(&curthread->td_msgport == cpu_portfn(0));
412 KKASSERT(inp->inp_pcbinfo == &tcbinfo[0]);
414 netmsg_init(&nm.base, NULL, &curthread->td_msgport,
415 MSGF_PRIORITY, in_pcbinswildcardhash_handler);
417 lwkt_domsg(cpu_portfn(1), &nm.base.lmsg, 0);
420 in_pcbinswildcardhash(inp);
421 COMMON_END(PRU_LISTEN);
427 tcp6_usr_listen(netmsg_t msg)
429 struct socket *so = msg->listen.base.nm_so;
430 struct thread *td = msg->listen.nm_td;
435 struct netmsg_inswildcard nm;
438 COMMON_START(so, inp, 0);
440 if (tp->t_flags & TF_LISTEN)
443 if (inp->inp_lport == 0) {
444 if (!(inp->inp_flags & IN6P_IPV6_V6ONLY))
445 inp->inp_vflag |= INP_IPV4;
447 inp->inp_vflag &= ~INP_IPV4;
448 error = in6_pcbbind(inp, NULL, td);
453 tp->t_state = TCPS_LISTEN;
454 tp->t_flags |= TF_LISTEN;
455 tp->tt_msg = NULL; /* Catch any invalid timer usage */
460 * We have to set the flag because we can't have other cpus
461 * messing with our inp's flags.
463 KASSERT(!(inp->inp_flags & INP_CONNECTED),
464 ("already on connhash\n"));
465 KASSERT(!(inp->inp_flags & INP_WILDCARD),
466 ("already on wildcardhash\n"));
467 KASSERT(!(inp->inp_flags & INP_WILDCARD_MP),
468 ("already on MP wildcardhash\n"));
469 inp->inp_flags |= INP_WILDCARD_MP;
471 KKASSERT(so->so_port == cpu_portfn(0));
472 KKASSERT(&curthread->td_msgport == cpu_portfn(0));
473 KKASSERT(inp->inp_pcbinfo == &tcbinfo[0]);
475 netmsg_init(&nm.base, NULL, &curthread->td_msgport,
476 MSGF_PRIORITY, in_pcbinswildcardhash_handler);
478 lwkt_domsg(cpu_portfn(1), &nm.base.lmsg, 0);
481 in_pcbinswildcardhash(inp);
482 COMMON_END(PRU_LISTEN);
487 * Initiate connection to peer.
488 * Create a template for use in transmissions on this connection.
489 * Enter SYN_SENT state, and mark socket as connecting.
490 * Start keep-alive timer, and seed output sequence space.
491 * Send initial segment on connection.
494 tcp_usr_connect(netmsg_t msg)
496 struct socket *so = msg->connect.base.nm_so;
497 struct sockaddr *nam = msg->connect.nm_nam;
498 struct thread *td = msg->connect.nm_td;
502 struct sockaddr_in *sinp;
504 COMMON_START(so, inp, 0);
507 * Must disallow TCP ``connections'' to multicast addresses.
509 sinp = (struct sockaddr_in *)nam;
510 if (sinp->sin_family == AF_INET
511 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
512 error = EAFNOSUPPORT;
516 if (!prison_remote_ip(td, (struct sockaddr*)sinp)) {
517 error = EAFNOSUPPORT; /* IPv6 only jail */
522 /* msg is invalid now */
525 if (msg->connect.nm_m) {
526 m_freem(msg->connect.nm_m);
527 msg->connect.nm_m = NULL;
529 lwkt_replymsg(&msg->lmsg, error);
535 tcp6_usr_connect(netmsg_t msg)
537 struct socket *so = msg->connect.base.nm_so;
538 struct sockaddr *nam = msg->connect.nm_nam;
539 struct thread *td = msg->connect.nm_td;
543 struct sockaddr_in6 *sin6p;
545 COMMON_START(so, inp, 0);
548 * Must disallow TCP ``connections'' to multicast addresses.
550 sin6p = (struct sockaddr_in6 *)nam;
551 if (sin6p->sin6_family == AF_INET6
552 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
553 error = EAFNOSUPPORT;
557 if (!prison_remote_ip(td, nam)) {
558 error = EAFNOSUPPORT; /* IPv4 only jail */
562 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
563 struct sockaddr_in *sinp;
565 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
569 sinp = kmalloc(sizeof(*sinp), M_LWKTMSG, M_INTWAIT);
570 in6_sin6_2_sin(sinp, sin6p);
571 inp->inp_vflag |= INP_IPV4;
572 inp->inp_vflag &= ~INP_IPV6;
573 msg->connect.nm_nam = (struct sockaddr *)sinp;
574 msg->connect.nm_reconnect |= NMSG_RECONNECT_NAMALLOC;
576 /* msg is invalid now */
579 inp->inp_vflag &= ~INP_IPV4;
580 inp->inp_vflag |= INP_IPV6;
581 inp->inp_inc.inc_isipv6 = 1;
583 msg->connect.nm_reconnect |= NMSG_RECONNECT_FALLBACK;
585 /* msg is invalid now */
588 if (msg->connect.nm_m) {
589 m_freem(msg->connect.nm_m);
590 msg->connect.nm_m = NULL;
592 lwkt_replymsg(&msg->lmsg, error);
598 * Initiate disconnect from peer.
599 * If connection never passed embryonic stage, just drop;
600 * else if don't need to let data drain, then can just drop anyways,
601 * else have to begin TCP shutdown process: mark socket disconnecting,
602 * drain unread data, state switch to reflect user close, and
603 * send segment (e.g. FIN) to peer. Socket will be really disconnected
604 * when peer sends FIN and acks ours.
606 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
609 tcp_usr_disconnect(netmsg_t msg)
611 struct socket *so = msg->disconnect.base.nm_so;
616 COMMON_START(so, inp, 1);
617 tp = tcp_disconnect(tp);
618 COMMON_END(PRU_DISCONNECT);
622 * Accept a connection. Essentially all the work is
623 * done at higher levels; just return the address
624 * of the peer, storing through addr.
627 tcp_usr_accept(netmsg_t msg)
629 struct socket *so = msg->accept.base.nm_so;
630 struct sockaddr **nam = msg->accept.nm_nam;
633 struct tcpcb *tp = NULL;
637 if (so->so_state & SS_ISDISCONNECTED) {
638 error = ECONNABORTED;
648 in_setpeeraddr(so, nam);
649 COMMON_END(PRU_ACCEPT);
654 tcp6_usr_accept(netmsg_t msg)
656 struct socket *so = msg->accept.base.nm_so;
657 struct sockaddr **nam = msg->accept.nm_nam;
660 struct tcpcb *tp = NULL;
665 if (so->so_state & SS_ISDISCONNECTED) {
666 error = ECONNABORTED;
675 in6_mapped_peeraddr(so, nam);
676 COMMON_END(PRU_ACCEPT);
680 * Mark the connection as being incapable of further output.
683 tcp_usr_shutdown(netmsg_t msg)
685 struct socket *so = msg->shutdown.base.nm_so;
690 COMMON_START(so, inp, 0);
692 tp = tcp_usrclosed(tp);
694 error = tcp_output(tp);
695 COMMON_END(PRU_SHUTDOWN);
699 * After a receive, possibly send window update to peer.
702 tcp_usr_rcvd(netmsg_t msg)
704 struct socket *so = msg->rcvd.base.nm_so;
709 COMMON_START(so, inp, 0);
711 COMMON_END(PRU_RCVD);
715 * Do a send by putting data in output queue and updating urgent
716 * marker if URG set. Possibly send more data. Unlike the other
717 * pru_*() routines, the mbuf chains are our responsibility. We
718 * must either enqueue them or free them. The other pru_* routines
719 * generally are caller-frees.
722 tcp_usr_send(netmsg_t msg)
724 struct socket *so = msg->send.base.nm_so;
725 int flags = msg->send.nm_flags;
726 struct mbuf *m = msg->send.nm_m;
727 struct sockaddr *nam = msg->send.nm_addr;
728 struct mbuf *control = msg->send.nm_control;
729 struct thread *td = msg->send.nm_td;
742 * OOPS! we lost a race, the TCP session got reset after
743 * we checked SS_CANTSENDMORE, eg: while doing uiomove or a
744 * network interrupt in the non-critical section of sosend().
749 error = ECONNRESET; /* XXX EPIPE? */
755 isipv6 = nam && nam->sa_family == AF_INET6;
760 /* TCP doesn't do control messages (rights, creds, etc) */
761 if (control->m_len) {
767 m_freem(control); /* empty control, just free it */
771 * Don't let too much OOB data build up
773 if (flags & PRUS_OOB) {
774 if (ssb_space(&so->so_snd) < -512) {
782 * Do implied connect if not yet connected. Any data sent
783 * with the connect is handled by tcp_connect() and friends.
785 * NOTE! PROTOCOL THREAD MAY BE CHANGED BY THE CONNECT!
787 if (nam && tp->t_state < TCPS_SYN_SENT) {
788 kprintf("implied fallback\n");
789 msg->connect.nm_nam = nam;
790 msg->connect.nm_td = td;
791 msg->connect.nm_m = m;
792 msg->connect.nm_flags = flags;
793 msg->connect.nm_reconnect = NMSG_RECONNECT_FALLBACK;
800 /* msg invalid now */
805 * Pump the data into the socket.
808 ssb_appendstream(&so->so_snd, m);
809 if (flags & PRUS_OOB) {
811 * According to RFC961 (Assigned Protocols),
812 * the urgent pointer points to the last octet
813 * of urgent data. We continue, however,
814 * to consider it to indicate the first octet
815 * of data past the urgent section.
816 * Otherwise, snd_up should be one lower.
818 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc;
819 tp->t_flags |= TF_FORCE;
820 error = tcp_output(tp);
821 tp->t_flags &= ~TF_FORCE;
823 if (flags & PRUS_EOF) {
825 * Close the send side of the connection after
829 tp = tcp_usrclosed(tp);
832 if (flags & PRUS_MORETOCOME)
833 tp->t_flags |= TF_MORETOCOME;
834 error = tcp_output(tp);
835 if (flags & PRUS_MORETOCOME)
836 tp->t_flags &= ~TF_MORETOCOME;
839 COMMON_END((flags & PRUS_OOB) ? PRU_SENDOOB :
840 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
844 * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort()
845 * will sofree() it when we return.
848 tcp_usr_abort(netmsg_t msg)
850 struct socket *so = msg->abort.base.nm_so;
855 COMMON_START(so, inp, 1);
856 tp = tcp_drop(tp, ECONNABORTED);
857 COMMON_END(PRU_ABORT);
861 * Receive out-of-band data.
864 tcp_usr_rcvoob(netmsg_t msg)
866 struct socket *so = msg->rcvoob.base.nm_so;
867 struct mbuf *m = msg->rcvoob.nm_m;
868 int flags = msg->rcvoob.nm_flags;
873 COMMON_START(so, inp, 0);
874 if ((so->so_oobmark == 0 &&
875 (so->so_state & SS_RCVATMARK) == 0) ||
876 so->so_options & SO_OOBINLINE ||
877 tp->t_oobflags & TCPOOB_HADDATA) {
881 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
886 *mtod(m, caddr_t) = tp->t_iobc;
887 if ((flags & MSG_PEEK) == 0)
888 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
889 COMMON_END(PRU_RCVOOB);
892 /* xxx - should be const */
893 struct pr_usrreqs tcp_usrreqs = {
894 .pru_abort = tcp_usr_abort,
895 .pru_accept = tcp_usr_accept,
896 .pru_attach = tcp_usr_attach,
897 .pru_bind = tcp_usr_bind,
898 .pru_connect = tcp_usr_connect,
899 .pru_connect2 = pr_generic_notsupp,
900 .pru_control = in_control_dispatch,
901 .pru_detach = tcp_usr_detach,
902 .pru_disconnect = tcp_usr_disconnect,
903 .pru_listen = tcp_usr_listen,
904 .pru_peeraddr = in_setpeeraddr_dispatch,
905 .pru_rcvd = tcp_usr_rcvd,
906 .pru_rcvoob = tcp_usr_rcvoob,
907 .pru_send = tcp_usr_send,
908 .pru_sense = pru_sense_null,
909 .pru_shutdown = tcp_usr_shutdown,
910 .pru_sockaddr = in_setsockaddr_dispatch,
911 .pru_sosend = sosend,
912 .pru_soreceive = soreceive
916 struct pr_usrreqs tcp6_usrreqs = {
917 .pru_abort = tcp_usr_abort,
918 .pru_accept = tcp6_usr_accept,
919 .pru_attach = tcp_usr_attach,
920 .pru_bind = tcp6_usr_bind,
921 .pru_connect = tcp6_usr_connect,
922 .pru_connect2 = pr_generic_notsupp,
923 .pru_control = in6_control_dispatch,
924 .pru_detach = tcp_usr_detach,
925 .pru_disconnect = tcp_usr_disconnect,
926 .pru_listen = tcp6_usr_listen,
927 .pru_peeraddr = in6_mapped_peeraddr_dispatch,
928 .pru_rcvd = tcp_usr_rcvd,
929 .pru_rcvoob = tcp_usr_rcvoob,
930 .pru_send = tcp_usr_send,
931 .pru_sense = pru_sense_null,
932 .pru_shutdown = tcp_usr_shutdown,
933 .pru_sockaddr = in6_mapped_sockaddr_dispatch,
934 .pru_sosend = sosend,
935 .pru_soreceive = soreceive
940 tcp_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf *m,
941 struct sockaddr_in *sin, struct sockaddr_in *if_sin)
943 struct inpcb *inp = tp->t_inpcb, *oinp;
944 struct socket *so = inp->inp_socket;
945 struct route *ro = &inp->inp_route;
947 oinp = in_pcblookup_hash(&tcbinfo[mycpu->gd_cpuid],
948 sin->sin_addr, sin->sin_port,
949 (inp->inp_laddr.s_addr != INADDR_ANY ?
950 inp->inp_laddr : if_sin->sin_addr),
951 inp->inp_lport, 0, NULL);
956 if (inp->inp_laddr.s_addr == INADDR_ANY)
957 inp->inp_laddr = if_sin->sin_addr;
958 inp->inp_faddr = sin->sin_addr;
959 inp->inp_fport = sin->sin_port;
960 inp->inp_cpcbinfo = &tcbinfo[mycpu->gd_cpuid];
961 in_pcbinsconnhash(inp);
964 * We are now on the inpcb's owner CPU, if the cached route was
965 * freed because the rtentry's owner CPU is not the current CPU
966 * (e.g. in tcp_connect()), then we try to reallocate it here with
967 * the hope that a rtentry may be cloned from a RTF_PRCLONING
970 if (!(inp->inp_socket->so_options & SO_DONTROUTE) && /*XXX*/
972 bzero(&ro->ro_dst, sizeof(struct sockaddr_in));
973 ro->ro_dst.sa_family = AF_INET;
974 ro->ro_dst.sa_len = sizeof(struct sockaddr_in);
975 ((struct sockaddr_in *)&ro->ro_dst)->sin_addr =
981 * Now that no more errors can occur, change the protocol processing
982 * port to the current thread (which is the correct thread).
984 * Create TCP timer message now; we are on the tcpcb's owner
987 tcp_create_timermsg(tp, &curthread->td_msgport);
990 * Compute window scaling to request. Use a larger scaling then
991 * needed for the initial receive buffer in case the receive buffer
994 if (tp->request_r_scale < TCP_MIN_WINSHIFT)
995 tp->request_r_scale = TCP_MIN_WINSHIFT;
996 while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
997 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat
999 tp->request_r_scale++;
1003 tcpstat.tcps_connattempt++;
1004 tp->t_state = TCPS_SYN_SENT;
1005 tcp_callout_reset(tp, tp->tt_keep, tcp_keepinit, tcp_timer_keep);
1006 tp->iss = tcp_new_isn(tp);
1007 tcp_sendseqinit(tp);
1009 ssb_appendstream(&so->so_snd, m);
1011 if (flags & PRUS_OOB)
1012 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc;
1016 * Close the send side of the connection after
1017 * the data is sent if flagged.
1019 if ((flags & (PRUS_OOB|PRUS_EOF)) == PRUS_EOF) {
1021 tp = tcp_usrclosed(tp);
1023 return (tcp_output(tp));
1027 * Common subroutine to open a TCP connection to remote host specified
1028 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local
1029 * port number if needed. Call in_pcbladdr to do the routing and to choose
1030 * a local host address (interface).
1031 * Initialize connection parameters and enter SYN-SENT state.
1034 tcp_connect(netmsg_t msg)
1036 struct socket *so = msg->connect.base.nm_so;
1037 struct sockaddr *nam = msg->connect.nm_nam;
1038 struct thread *td = msg->connect.nm_td;
1039 struct sockaddr_in *sin = (struct sockaddr_in *)nam;
1040 struct sockaddr_in *if_sin;
1048 COMMON_START(so, inp, 0);
1051 * Reconnect our pcb if we have to
1053 if (msg->connect.nm_reconnect & NMSG_RECONNECT_RECONNECT) {
1054 msg->connect.nm_reconnect &= ~NMSG_RECONNECT_RECONNECT;
1055 in_pcblink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1059 * Bind if we have to
1061 if (inp->inp_lport == 0) {
1062 error = in_pcbbind(inp, NULL, td);
1066 so = inp->inp_socket;
1070 * Calculate the correct protocol processing thread. The connect
1071 * operation must run there. Set the forwarding port before we
1072 * forward the message or it will get bounced right back to us.
1074 error = in_pcbladdr(inp, nam, &if_sin, td);
1079 port = tcp_addrport(sin->sin_addr.s_addr, sin->sin_port,
1080 (inp->inp_laddr.s_addr ?
1081 inp->inp_laddr.s_addr : if_sin->sin_addr.s_addr),
1084 if (port != &curthread->td_msgport) {
1085 struct route *ro = &inp->inp_route;
1088 * in_pcbladdr() may have allocated a route entry for us
1089 * on the current CPU, but we need a route entry on the
1090 * inpcb's owner CPU, so free it here.
1092 if (ro->ro_rt != NULL)
1094 bzero(ro, sizeof(*ro));
1097 * We are moving the protocol processing port the socket
1098 * is on, we have to unlink here and re-link on the
1101 in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1102 sosetport(so, port);
1103 msg->connect.nm_reconnect |= NMSG_RECONNECT_RECONNECT;
1104 msg->connect.base.nm_dispatch = tcp_connect;
1106 lwkt_forwardmsg(port, &msg->connect.base.lmsg);
1107 /* msg invalid now */
1111 KKASSERT(so->so_port == &curthread->td_msgport);
1113 error = tcp_connect_oncpu(tp, msg->connect.nm_flags,
1114 msg->connect.nm_m, sin, if_sin);
1115 msg->connect.nm_m = NULL;
1117 if (msg->connect.nm_m) {
1118 m_freem(msg->connect.nm_m);
1119 msg->connect.nm_m = NULL;
1121 if (msg->connect.nm_reconnect & NMSG_RECONNECT_NAMALLOC) {
1122 kfree(msg->connect.nm_nam, M_LWKTMSG);
1123 msg->connect.nm_nam = NULL;
1125 lwkt_replymsg(&msg->connect.base.lmsg, error);
1126 /* msg invalid now */
1132 tcp6_connect(netmsg_t msg)
1135 struct socket *so = msg->connect.base.nm_so;
1136 struct sockaddr *nam = msg->connect.nm_nam;
1137 struct thread *td = msg->connect.nm_td;
1139 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
1140 struct in6_addr *addr6;
1146 COMMON_START(so, inp, 0);
1149 * Reconnect our pcb if we have to
1151 if (msg->connect.nm_reconnect & NMSG_RECONNECT_RECONNECT) {
1152 msg->connect.nm_reconnect &= ~NMSG_RECONNECT_RECONNECT;
1153 in_pcblink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1157 * Bind if we have to
1159 if (inp->inp_lport == 0) {
1160 error = in6_pcbbind(inp, NULL, td);
1166 * Cannot simply call in_pcbconnect, because there might be an
1167 * earlier incarnation of this same connection still in
1168 * TIME_WAIT state, creating an ADDRINUSE error.
1170 error = in6_pcbladdr(inp, nam, &addr6, td);
1175 port = tcp6_addrport(); /* XXX hack for now, always cpu0 */
1177 if (port != &curthread->td_msgport) {
1178 struct route *ro = &inp->inp_route;
1181 * in_pcbladdr() may have allocated a route entry for us
1182 * on the current CPU, but we need a route entry on the
1183 * inpcb's owner CPU, so free it here.
1185 if (ro->ro_rt != NULL)
1187 bzero(ro, sizeof(*ro));
1189 in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1190 sosetport(so, port);
1191 msg->connect.nm_reconnect |= NMSG_RECONNECT_RECONNECT;
1192 msg->connect.base.nm_dispatch = tcp6_connect;
1194 lwkt_forwardmsg(port, &msg->connect.base.lmsg);
1195 /* msg invalid now */
1199 error = tcp6_connect_oncpu(tp, msg->connect.nm_flags,
1200 &msg->connect.nm_m, sin6, addr6);
1201 /* nm_m may still be intact */
1203 if (error && (msg->connect.nm_reconnect & NMSG_RECONNECT_FALLBACK)) {
1205 /* msg invalid now */
1207 if (msg->connect.nm_m) {
1208 m_freem(msg->connect.nm_m);
1209 msg->connect.nm_m = NULL;
1211 if (msg->connect.nm_reconnect & NMSG_RECONNECT_NAMALLOC) {
1212 kfree(msg->connect.nm_nam, M_LWKTMSG);
1213 msg->connect.nm_nam = NULL;
1215 lwkt_replymsg(&msg->connect.base.lmsg, error);
1216 /* msg invalid now */
1221 tcp6_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf **mp,
1222 struct sockaddr_in6 *sin6, struct in6_addr *addr6)
1224 struct mbuf *m = *mp;
1225 struct inpcb *inp = tp->t_inpcb;
1226 struct socket *so = inp->inp_socket;
1230 * Cannot simply call in_pcbconnect, because there might be an
1231 * earlier incarnation of this same connection still in
1232 * TIME_WAIT state, creating an ADDRINUSE error.
1234 oinp = in6_pcblookup_hash(inp->inp_cpcbinfo,
1235 &sin6->sin6_addr, sin6->sin6_port,
1236 (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) ?
1237 addr6 : &inp->in6p_laddr),
1238 inp->inp_lport, 0, NULL);
1240 return (EADDRINUSE);
1242 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
1243 inp->in6p_laddr = *addr6;
1244 inp->in6p_faddr = sin6->sin6_addr;
1245 inp->inp_fport = sin6->sin6_port;
1246 if ((sin6->sin6_flowinfo & IPV6_FLOWINFO_MASK) != 0)
1247 inp->in6p_flowinfo = sin6->sin6_flowinfo;
1248 in_pcbinsconnhash(inp);
1251 * Now that no more errors can occur, change the protocol processing
1252 * port to the current thread (which is the correct thread).
1254 * Create TCP timer message now; we are on the tcpcb's owner
1257 tcp_create_timermsg(tp, &curthread->td_msgport);
1259 /* Compute window scaling to request. */
1260 if (tp->request_r_scale < TCP_MIN_WINSHIFT)
1261 tp->request_r_scale = TCP_MIN_WINSHIFT;
1262 while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1263 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat) {
1264 tp->request_r_scale++;
1268 tcpstat.tcps_connattempt++;
1269 tp->t_state = TCPS_SYN_SENT;
1270 tcp_callout_reset(tp, tp->tt_keep, tcp_keepinit, tcp_timer_keep);
1271 tp->iss = tcp_new_isn(tp);
1272 tcp_sendseqinit(tp);
1274 ssb_appendstream(&so->so_snd, m);
1276 if (flags & PRUS_OOB)
1277 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc;
1281 * Close the send side of the connection after
1282 * the data is sent if flagged.
1284 if ((flags & (PRUS_OOB|PRUS_EOF)) == PRUS_EOF) {
1286 tp = tcp_usrclosed(tp);
1288 return (tcp_output(tp));
1294 * The new sockopt interface makes it possible for us to block in the
1295 * copyin/out step (if we take a page fault). Taking a page fault while
1296 * in a critical section is probably a Bad Thing. (Since sockets and pcbs
1297 * both now use TSM, there probably isn't any need for this function to
1298 * run in a critical section any more. This needs more examination.)
1301 tcp_ctloutput(netmsg_t msg)
1303 struct socket *so = msg->base.nm_so;
1304 struct sockopt *sopt = msg->ctloutput.nm_sopt;
1305 int error, opt, optval;
1316 if (sopt->sopt_level != IPPROTO_TCP) {
1318 if (INP_CHECK_SOCKAF(so, AF_INET6))
1319 ip6_ctloutput_dispatch(msg);
1323 /* msg invalid now */
1326 tp = intotcpcb(inp);
1328 switch (sopt->sopt_dir) {
1330 error = soopt_to_kbuf(sopt, &optval, sizeof optval,
1334 switch (sopt->sopt_name) {
1337 if ((tp->t_flags & TF_FASTKEEP) == 0) {
1338 tp->t_flags |= TF_FASTKEEP;
1339 tcp_timer_keep_activity(tp, 0);
1342 tp->t_flags &= ~TF_FASTKEEP;
1345 #ifdef TCP_SIGNATURE
1346 case TCP_SIGNATURE_ENABLE:
1348 tp->t_flags |= TF_SIGNATURE;
1350 tp->t_flags &= ~TF_SIGNATURE;
1352 #endif /* TCP_SIGNATURE */
1355 switch (sopt->sopt_name) {
1363 opt = 0; /* dead code to fool gcc */
1370 tp->t_flags &= ~opt;
1375 tp->t_flags |= TF_NOPUSH;
1377 tp->t_flags &= ~TF_NOPUSH;
1378 error = tcp_output(tp);
1384 * Must be between 0 and maxseg. If the requested
1385 * maxseg is too small to satisfy the desired minmss,
1386 * pump it up (silently so sysctl modifications of
1387 * minmss do not create unexpected program failures).
1388 * Handle degenerate cases.
1390 if (optval > 0 && optval <= tp->t_maxseg) {
1391 if (optval + 40 < tcp_minmss) {
1392 optval = tcp_minmss - 40;
1396 tp->t_maxseg = optval;
1403 error = ENOPROTOOPT;
1409 switch (sopt->sopt_name) {
1410 #ifdef TCP_SIGNATURE
1411 case TCP_SIGNATURE_ENABLE:
1412 optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0;
1414 #endif /* TCP_SIGNATURE */
1416 optval = tp->t_flags & TF_NODELAY;
1419 optval = tp->t_maxseg;
1422 optval = tp->t_flags & TF_NOOPT;
1425 optval = tp->t_flags & TF_NOPUSH;
1428 error = ENOPROTOOPT;
1432 soopt_from_kbuf(sopt, &optval, sizeof optval);
1436 lwkt_replymsg(&msg->lmsg, error);
1440 * tcp_sendspace and tcp_recvspace are the default send and receive window
1441 * sizes, respectively. These are obsolescent (this information should
1442 * be set by the route).
1444 * Use a default that does not require tcp window scaling to be turned
1445 * on. Individual programs or the administrator can increase the default.
1447 u_long tcp_sendspace = 57344; /* largest multiple of PAGE_SIZE < 64k */
1448 SYSCTL_INT(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW,
1449 &tcp_sendspace , 0, "Maximum outgoing TCP datagram size");
1450 u_long tcp_recvspace = 57344; /* largest multiple of PAGE_SIZE < 64k */
1451 SYSCTL_INT(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
1452 &tcp_recvspace , 0, "Maximum incoming TCP datagram size");
1455 * Attach TCP protocol to socket, allocating internet protocol control
1456 * block, tcp control block, bufer space, and entering LISTEN state
1457 * if to accept connections.
1460 tcp_attach(struct socket *so, struct pru_attach_info *ai)
1467 int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6) != 0;
1470 if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) {
1471 lwkt_gettoken(&so->so_rcv.ssb_token);
1472 error = soreserve(so, tcp_sendspace, tcp_recvspace,
1474 lwkt_reltoken(&so->so_rcv.ssb_token);
1478 atomic_set_int(&so->so_rcv.ssb_flags, SSB_AUTOSIZE);
1479 atomic_set_int(&so->so_snd.ssb_flags, SSB_AUTOSIZE);
1480 cpu = mycpu->gd_cpuid;
1483 * Set the default port for protocol processing. This will likely
1484 * change when we connect.
1486 error = in_pcballoc(so, &tcbinfo[cpu]);
1492 inp->inp_vflag |= INP_IPV6;
1493 inp->in6p_hops = -1; /* use kernel default */
1497 inp->inp_vflag |= INP_IPV4;
1498 tp = tcp_newtcpcb(inp);
1501 * Make sure the socket is destroyed by the pcbdetach.
1510 sofree(so); /* from ref above */
1513 tp->t_state = TCPS_CLOSED;
1518 * Initiate (or continue) disconnect.
1519 * If embryonic state, just send reset (once).
1520 * If in ``let data drain'' option and linger null, just drop.
1521 * Otherwise (hard), mark socket disconnecting and drop
1522 * current input data; switch states based on user close, and
1523 * send segment to peer (with FIN).
1525 static struct tcpcb *
1526 tcp_disconnect(struct tcpcb *tp)
1528 struct socket *so = tp->t_inpcb->inp_socket;
1530 if (tp->t_state < TCPS_ESTABLISHED) {
1532 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
1533 tp = tcp_drop(tp, 0);
1535 lwkt_gettoken(&so->so_rcv.ssb_token);
1536 soisdisconnecting(so);
1537 sbflush(&so->so_rcv.sb);
1538 tp = tcp_usrclosed(tp);
1541 lwkt_reltoken(&so->so_rcv.ssb_token);
1547 * User issued close, and wish to trail through shutdown states:
1548 * if never received SYN, just forget it. If got a SYN from peer,
1549 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
1550 * If already got a FIN from peer, then almost done; go to LAST_ACK
1551 * state. In all other cases, have already sent FIN to peer (e.g.
1552 * after PRU_SHUTDOWN), and just have to play tedious game waiting
1553 * for peer to send FIN or not respond to keep-alives, etc.
1554 * We can let the user exit from the close as soon as the FIN is acked.
1556 static struct tcpcb *
1557 tcp_usrclosed(struct tcpcb *tp)
1560 switch (tp->t_state) {
1564 tp->t_state = TCPS_CLOSED;
1569 case TCPS_SYN_RECEIVED:
1570 tp->t_flags |= TF_NEEDFIN;
1573 case TCPS_ESTABLISHED:
1574 tp->t_state = TCPS_FIN_WAIT_1;
1577 case TCPS_CLOSE_WAIT:
1578 tp->t_state = TCPS_LAST_ACK;
1581 if (tp && tp->t_state >= TCPS_FIN_WAIT_2) {
1582 soisdisconnected(tp->t_inpcb->inp_socket);
1583 /* To prevent the connection hanging in FIN_WAIT_2 forever. */
1584 if (tp->t_state == TCPS_FIN_WAIT_2) {
1585 tcp_callout_reset(tp, tp->tt_2msl, tcp_maxidle,