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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17 * contributors may be used to endorse or promote products derived
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39 * modification, are permitted provided that the following conditions
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63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 $
70 #include "opt_ipsec.h"
72 #include "opt_inet6.h"
73 #include "opt_tcpdebug.h"
75 #include <sys/param.h>
76 #include <sys/systm.h>
77 #include <sys/kernel.h>
78 #include <sys/malloc.h>
79 #include <sys/sysctl.h>
80 #include <sys/globaldata.h>
81 #include <sys/thread.h>
85 #include <sys/domain.h>
87 #include <sys/socket.h>
88 #include <sys/socketvar.h>
89 #include <sys/socketops.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)
162 static int tcp_lport_extension = 1;
163 SYSCTL_INT(_net_inet_tcp, OID_AUTO, lportext, CTLFLAG_RW,
164 &tcp_lport_extension, 0, "");
167 * For some ill optimized programs, which try to use TCP_NOPUSH
168 * to improve performance, will have small amount of data sits
169 * in the sending buffer. These small amount of data will _not_
170 * be pushed into the network until more data are written into
171 * the socket or the socket write side is shutdown.
173 static int tcp_disable_nopush = 1;
174 SYSCTL_INT(_net_inet_tcp, OID_AUTO, disable_nopush, CTLFLAG_RW,
175 &tcp_disable_nopush, 0, "TCP_NOPUSH socket option will have no effect");
178 * TCP attaches to socket via pru_attach(), reserving space,
179 * and an internet control block. This is likely occuring on
180 * cpu0 and may have to move later when we bind/connect.
183 tcp_usr_attach(netmsg_t msg)
185 struct socket *so = msg->base.nm_so;
186 struct pru_attach_info *ai = msg->attach.nm_ai;
189 struct tcpcb *tp = NULL;
200 error = tcp_attach(so, ai);
204 if ((so->so_options & SO_LINGER) && so->so_linger == 0)
205 so->so_linger = TCP_LINGERTIME;
208 sofree(so); /* from ref above */
209 TCPDEBUG2(PRU_ATTACH);
210 lwkt_replymsg(&msg->lmsg, error);
214 * pru_detach() detaches the TCP protocol from the socket.
215 * If the protocol state is non-embryonic, then can't
216 * do this directly: have to initiate a pru_disconnect(),
217 * which may finish later; embryonic TCB's can just
221 tcp_usr_detach(netmsg_t msg)
223 struct socket *so = msg->base.nm_so;
232 * If the inp is already detached it may have been due to an async
233 * close. Just return as if no error occured.
235 * It's possible for the tcpcb (tp) to disconnect from the inp due
236 * to tcp_drop()->tcp_close() being called. This may occur *after*
237 * the detach message has been queued so we may find a NULL tp here.
240 if ((tp = intotcpcb(inp)) != NULL) {
242 tp = tcp_disconnect(tp);
243 TCPDEBUG2(PRU_DETACH);
246 lwkt_replymsg(&msg->lmsg, error);
250 * NOTE: ignore_error is non-zero for certain disconnection races
251 * which we want to silently allow, otherwise close() may return
252 * an unexpected error.
254 * NOTE: The variables (msg) and (tp) are assumed.
256 #define COMMON_START(so, inp, ignore_error) \
262 error = ignore_error ? 0 : EINVAL; \
266 tp = intotcpcb(inp); \
270 #define COMMON_END1(req, noreply) \
274 lwkt_replymsg(&msg->lmsg, error); \
278 #define COMMON_END(req) COMMON_END1((req), 0)
281 * Give the socket an address.
284 tcp_usr_bind(netmsg_t msg)
286 struct socket *so = msg->bind.base.nm_so;
287 struct sockaddr *nam = msg->bind.nm_nam;
288 struct thread *td = msg->bind.nm_td;
292 struct sockaddr_in *sinp;
294 COMMON_START(so, inp, 0);
297 * Must check for multicast addresses and disallow binding
300 sinp = (struct sockaddr_in *)nam;
301 if (sinp->sin_family == AF_INET &&
302 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
303 error = EAFNOSUPPORT;
306 error = in_pcbbind(inp, nam, td);
309 COMMON_END(PRU_BIND);
316 tcp6_usr_bind(netmsg_t msg)
318 struct socket *so = msg->bind.base.nm_so;
319 struct sockaddr *nam = msg->bind.nm_nam;
320 struct thread *td = msg->bind.nm_td;
324 struct sockaddr_in6 *sin6p;
326 COMMON_START(so, inp, 0);
329 * Must check for multicast addresses and disallow binding
332 sin6p = (struct sockaddr_in6 *)nam;
333 if (sin6p->sin6_family == AF_INET6 &&
334 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
335 error = EAFNOSUPPORT;
338 inp->inp_vflag &= ~INP_IPV4;
339 inp->inp_vflag |= INP_IPV6;
340 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
341 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr))
342 inp->inp_vflag |= INP_IPV4;
343 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
344 struct sockaddr_in sin;
346 in6_sin6_2_sin(&sin, sin6p);
347 inp->inp_vflag |= INP_IPV4;
348 inp->inp_vflag &= ~INP_IPV6;
349 error = in_pcbbind(inp, (struct sockaddr *)&sin, td);
353 error = in6_pcbbind(inp, nam, td);
356 COMMON_END(PRU_BIND);
360 struct netmsg_inswildcard {
361 struct netmsg_base base;
362 struct inpcb *nm_inp;
366 in_pcbinswildcardhash_handler(netmsg_t msg)
368 struct netmsg_inswildcard *nm = (struct netmsg_inswildcard *)msg;
369 int cpu = mycpuid, nextcpu;
371 in_pcbinswildcardhash_oncpu(nm->nm_inp, &tcbinfo[cpu]);
374 if (nextcpu < ncpus2)
375 lwkt_forwardmsg(netisr_portfn(nextcpu), &nm->base.lmsg);
377 lwkt_replymsg(&nm->base.lmsg, 0);
381 * Prepare to accept connections.
384 tcp_usr_listen(netmsg_t msg)
386 struct socket *so = msg->listen.base.nm_so;
387 struct thread *td = msg->listen.nm_td;
391 struct netmsg_inswildcard nm;
393 COMMON_START(so, inp, 0);
395 if (tp->t_flags & TF_LISTEN)
398 if (inp->inp_lport == 0) {
399 error = in_pcbbind(inp, NULL, td);
404 tp->t_state = TCPS_LISTEN;
405 tp->t_flags |= TF_LISTEN;
406 tp->tt_msg = NULL; /* Catch any invalid timer usage */
410 * We have to set the flag because we can't have other cpus
411 * messing with our inp's flags.
413 KASSERT(!(inp->inp_flags & INP_CONNECTED),
414 ("already on connhash"));
415 KASSERT(!(inp->inp_flags & INP_WILDCARD),
416 ("already on wildcardhash"));
417 KASSERT(!(inp->inp_flags & INP_WILDCARD_MP),
418 ("already on MP wildcardhash"));
419 inp->inp_flags |= INP_WILDCARD_MP;
421 KKASSERT(so->so_port == netisr_portfn(0));
422 KKASSERT(&curthread->td_msgport == netisr_portfn(0));
423 KKASSERT(inp->inp_pcbinfo == &tcbinfo[0]);
425 netmsg_init(&nm.base, NULL, &curthread->td_msgport,
426 MSGF_PRIORITY, in_pcbinswildcardhash_handler);
428 lwkt_domsg(netisr_portfn(1), &nm.base.lmsg, 0);
430 in_pcbinswildcardhash(inp);
431 COMMON_END(PRU_LISTEN);
437 tcp6_usr_listen(netmsg_t msg)
439 struct socket *so = msg->listen.base.nm_so;
440 struct thread *td = msg->listen.nm_td;
444 struct netmsg_inswildcard nm;
446 COMMON_START(so, inp, 0);
448 if (tp->t_flags & TF_LISTEN)
451 if (inp->inp_lport == 0) {
452 if (!(inp->inp_flags & IN6P_IPV6_V6ONLY))
453 inp->inp_vflag |= INP_IPV4;
455 inp->inp_vflag &= ~INP_IPV4;
456 error = in6_pcbbind(inp, NULL, td);
461 tp->t_state = TCPS_LISTEN;
462 tp->t_flags |= TF_LISTEN;
463 tp->tt_msg = NULL; /* Catch any invalid timer usage */
467 * We have to set the flag because we can't have other cpus
468 * messing with our inp's flags.
470 KASSERT(!(inp->inp_flags & INP_CONNECTED),
471 ("already on connhash"));
472 KASSERT(!(inp->inp_flags & INP_WILDCARD),
473 ("already on wildcardhash"));
474 KASSERT(!(inp->inp_flags & INP_WILDCARD_MP),
475 ("already on MP wildcardhash"));
476 inp->inp_flags |= INP_WILDCARD_MP;
478 KKASSERT(so->so_port == netisr_portfn(0));
479 KKASSERT(&curthread->td_msgport == netisr_portfn(0));
480 KKASSERT(inp->inp_pcbinfo == &tcbinfo[0]);
482 netmsg_init(&nm.base, NULL, &curthread->td_msgport,
483 MSGF_PRIORITY, in_pcbinswildcardhash_handler);
485 lwkt_domsg(netisr_portfn(1), &nm.base.lmsg, 0);
487 in_pcbinswildcardhash(inp);
488 COMMON_END(PRU_LISTEN);
493 * Initiate connection to peer.
494 * Create a template for use in transmissions on this connection.
495 * Enter SYN_SENT state, and mark socket as connecting.
496 * Start keep-alive timer, and seed output sequence space.
497 * Send initial segment on connection.
500 tcp_usr_connect(netmsg_t msg)
502 struct socket *so = msg->connect.base.nm_so;
503 struct sockaddr *nam = msg->connect.nm_nam;
504 struct thread *td = msg->connect.nm_td;
508 struct sockaddr_in *sinp;
510 COMMON_START(so, inp, 0);
513 * Must disallow TCP ``connections'' to multicast addresses.
515 sinp = (struct sockaddr_in *)nam;
516 if (sinp->sin_family == AF_INET
517 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
518 error = EAFNOSUPPORT;
522 if (!prison_remote_ip(td, (struct sockaddr*)sinp)) {
523 error = EAFNOSUPPORT; /* IPv6 only jail */
528 /* msg is invalid now */
531 if (msg->connect.nm_m) {
532 m_freem(msg->connect.nm_m);
533 msg->connect.nm_m = NULL;
535 lwkt_replymsg(&msg->lmsg, error);
541 tcp6_usr_connect(netmsg_t msg)
543 struct socket *so = msg->connect.base.nm_so;
544 struct sockaddr *nam = msg->connect.nm_nam;
545 struct thread *td = msg->connect.nm_td;
549 struct sockaddr_in6 *sin6p;
551 COMMON_START(so, inp, 0);
554 * Must disallow TCP ``connections'' to multicast addresses.
556 sin6p = (struct sockaddr_in6 *)nam;
557 if (sin6p->sin6_family == AF_INET6
558 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
559 error = EAFNOSUPPORT;
563 if (!prison_remote_ip(td, nam)) {
564 error = EAFNOSUPPORT; /* IPv4 only jail */
568 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
569 struct sockaddr_in *sinp;
571 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
575 sinp = kmalloc(sizeof(*sinp), M_LWKTMSG, M_INTWAIT);
576 in6_sin6_2_sin(sinp, sin6p);
577 inp->inp_vflag |= INP_IPV4;
578 inp->inp_vflag &= ~INP_IPV6;
579 msg->connect.nm_nam = (struct sockaddr *)sinp;
580 msg->connect.nm_reconnect |= NMSG_RECONNECT_NAMALLOC;
582 /* msg is invalid now */
585 inp->inp_vflag &= ~INP_IPV4;
586 inp->inp_vflag |= INP_IPV6;
587 inp->inp_inc.inc_isipv6 = 1;
589 msg->connect.nm_reconnect |= NMSG_RECONNECT_FALLBACK;
591 /* msg is invalid now */
594 if (msg->connect.nm_m) {
595 m_freem(msg->connect.nm_m);
596 msg->connect.nm_m = NULL;
598 lwkt_replymsg(&msg->lmsg, error);
604 * Initiate disconnect from peer.
605 * If connection never passed embryonic stage, just drop;
606 * else if don't need to let data drain, then can just drop anyways,
607 * else have to begin TCP shutdown process: mark socket disconnecting,
608 * drain unread data, state switch to reflect user close, and
609 * send segment (e.g. FIN) to peer. Socket will be really disconnected
610 * when peer sends FIN and acks ours.
612 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
615 tcp_usr_disconnect(netmsg_t msg)
617 struct socket *so = msg->disconnect.base.nm_so;
622 COMMON_START(so, inp, 1);
623 tp = tcp_disconnect(tp);
624 COMMON_END(PRU_DISCONNECT);
628 * Accept a connection. Essentially all the work is
629 * done at higher levels; just return the address
630 * of the peer, storing through addr.
633 tcp_usr_accept(netmsg_t msg)
635 struct socket *so = msg->accept.base.nm_so;
636 struct sockaddr **nam = msg->accept.nm_nam;
639 struct tcpcb *tp = NULL;
643 if (so->so_state & SS_ISDISCONNECTED) {
644 error = ECONNABORTED;
654 in_setpeeraddr(so, nam);
655 COMMON_END(PRU_ACCEPT);
660 tcp6_usr_accept(netmsg_t msg)
662 struct socket *so = msg->accept.base.nm_so;
663 struct sockaddr **nam = msg->accept.nm_nam;
666 struct tcpcb *tp = NULL;
671 if (so->so_state & SS_ISDISCONNECTED) {
672 error = ECONNABORTED;
681 in6_mapped_peeraddr(so, nam);
682 COMMON_END(PRU_ACCEPT);
686 * Mark the connection as being incapable of further output.
689 tcp_usr_shutdown(netmsg_t msg)
691 struct socket *so = msg->shutdown.base.nm_so;
696 COMMON_START(so, inp, 0);
698 tp = tcp_usrclosed(tp);
700 error = tcp_output(tp);
701 COMMON_END(PRU_SHUTDOWN);
705 * After a receive, possibly send window update to peer.
708 tcp_usr_rcvd(netmsg_t msg)
710 struct socket *so = msg->rcvd.base.nm_so;
711 int error = 0, noreply = 0;
715 COMMON_START(so, inp, 0);
717 if (msg->rcvd.nm_pru_flags & PRUR_ASYNC) {
719 so_async_rcvd_reply(so);
723 COMMON_END1(PRU_RCVD, noreply);
727 * Do a send by putting data in output queue and updating urgent
728 * marker if URG set. Possibly send more data. Unlike the other
729 * pru_*() routines, the mbuf chains are our responsibility. We
730 * must either enqueue them or free them. The other pru_* routines
731 * generally are caller-frees.
734 tcp_usr_send(netmsg_t msg)
736 struct socket *so = msg->send.base.nm_so;
737 int flags = msg->send.nm_flags;
738 struct mbuf *m = msg->send.nm_m;
744 KKASSERT(msg->send.nm_control == NULL);
745 KKASSERT(msg->send.nm_addr == NULL);
746 KKASSERT((flags & PRUS_FREEADDR) == 0);
752 * OOPS! we lost a race, the TCP session got reset after
753 * we checked SS_CANTSENDMORE, eg: while doing uiomove or a
754 * network interrupt in the non-critical section of sosend().
757 error = ECONNRESET; /* XXX EPIPE? */
767 * This is no longer necessary, since:
768 * - sosendtcp() has already checked it for us
769 * - It does not work with asynchronized send
773 * Don't let too much OOB data build up
775 if (flags & PRUS_OOB) {
776 if (ssb_space(&so->so_snd) < -512) {
785 * Pump the data into the socket.
788 ssb_appendstream(&so->so_snd, m);
789 if (flags & PRUS_OOB) {
791 * According to RFC961 (Assigned Protocols),
792 * the urgent pointer points to the last octet
793 * of urgent data. We continue, however,
794 * to consider it to indicate the first octet
795 * of data past the urgent section.
796 * Otherwise, snd_up should be one lower.
798 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc;
799 tp->t_flags |= TF_FORCE;
800 error = tcp_output(tp);
801 tp->t_flags &= ~TF_FORCE;
803 if (flags & PRUS_EOF) {
805 * Close the send side of the connection after
809 tp = tcp_usrclosed(tp);
811 if (tp != NULL && !tcp_output_pending(tp)) {
812 if (flags & PRUS_MORETOCOME)
813 tp->t_flags |= TF_MORETOCOME;
814 error = tcp_output_fair(tp);
815 if (flags & PRUS_MORETOCOME)
816 tp->t_flags &= ~TF_MORETOCOME;
819 COMMON_END1((flags & PRUS_OOB) ? PRU_SENDOOB :
820 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND),
821 (flags & PRUS_NOREPLY));
825 * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort()
826 * will sofree() it when we return.
829 tcp_usr_abort(netmsg_t msg)
831 struct socket *so = msg->abort.base.nm_so;
836 COMMON_START(so, inp, 1);
837 tp = tcp_drop(tp, ECONNABORTED);
838 COMMON_END(PRU_ABORT);
842 * Receive out-of-band data.
845 tcp_usr_rcvoob(netmsg_t msg)
847 struct socket *so = msg->rcvoob.base.nm_so;
848 struct mbuf *m = msg->rcvoob.nm_m;
849 int flags = msg->rcvoob.nm_flags;
854 COMMON_START(so, inp, 0);
855 if ((so->so_oobmark == 0 &&
856 (so->so_state & SS_RCVATMARK) == 0) ||
857 so->so_options & SO_OOBINLINE ||
858 tp->t_oobflags & TCPOOB_HADDATA) {
862 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
867 *mtod(m, caddr_t) = tp->t_iobc;
868 if ((flags & MSG_PEEK) == 0)
869 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
870 COMMON_END(PRU_RCVOOB);
874 tcp_usr_savefaddr(struct socket *so, const struct sockaddr *faddr)
876 in_savefaddr(so, faddr);
881 tcp6_usr_savefaddr(struct socket *so, const struct sockaddr *faddr)
883 in6_mapped_savefaddr(so, faddr);
887 /* xxx - should be const */
888 struct pr_usrreqs tcp_usrreqs = {
889 .pru_abort = tcp_usr_abort,
890 .pru_accept = tcp_usr_accept,
891 .pru_attach = tcp_usr_attach,
892 .pru_bind = tcp_usr_bind,
893 .pru_connect = tcp_usr_connect,
894 .pru_connect2 = pr_generic_notsupp,
895 .pru_control = in_control_dispatch,
896 .pru_detach = tcp_usr_detach,
897 .pru_disconnect = tcp_usr_disconnect,
898 .pru_listen = tcp_usr_listen,
899 .pru_peeraddr = in_setpeeraddr_dispatch,
900 .pru_rcvd = tcp_usr_rcvd,
901 .pru_rcvoob = tcp_usr_rcvoob,
902 .pru_send = tcp_usr_send,
903 .pru_sense = pru_sense_null,
904 .pru_shutdown = tcp_usr_shutdown,
905 .pru_sockaddr = in_setsockaddr_dispatch,
906 .pru_sosend = sosendtcp,
907 .pru_soreceive = sorecvtcp,
908 .pru_savefaddr = tcp_usr_savefaddr
912 struct pr_usrreqs tcp6_usrreqs = {
913 .pru_abort = tcp_usr_abort,
914 .pru_accept = tcp6_usr_accept,
915 .pru_attach = tcp_usr_attach,
916 .pru_bind = tcp6_usr_bind,
917 .pru_connect = tcp6_usr_connect,
918 .pru_connect2 = pr_generic_notsupp,
919 .pru_control = in6_control_dispatch,
920 .pru_detach = tcp_usr_detach,
921 .pru_disconnect = tcp_usr_disconnect,
922 .pru_listen = tcp6_usr_listen,
923 .pru_peeraddr = in6_mapped_peeraddr_dispatch,
924 .pru_rcvd = tcp_usr_rcvd,
925 .pru_rcvoob = tcp_usr_rcvoob,
926 .pru_send = tcp_usr_send,
927 .pru_sense = pru_sense_null,
928 .pru_shutdown = tcp_usr_shutdown,
929 .pru_sockaddr = in6_mapped_sockaddr_dispatch,
930 .pru_sosend = sosendtcp,
931 .pru_soreceive = sorecvtcp,
932 .pru_savefaddr = tcp6_usr_savefaddr
937 tcp_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf *m,
938 struct sockaddr_in *sin, struct sockaddr_in *if_sin)
940 struct inpcb *inp = tp->t_inpcb, *oinp;
941 struct socket *so = inp->inp_socket;
942 struct route *ro = &inp->inp_route;
944 oinp = in_pcblookup_hash(&tcbinfo[mycpu->gd_cpuid],
945 sin->sin_addr, sin->sin_port,
946 (inp->inp_laddr.s_addr != INADDR_ANY ?
947 inp->inp_laddr : if_sin->sin_addr),
948 inp->inp_lport, 0, NULL);
953 if (inp->inp_laddr.s_addr == INADDR_ANY)
954 inp->inp_laddr = if_sin->sin_addr;
955 inp->inp_faddr = sin->sin_addr;
956 inp->inp_fport = sin->sin_port;
957 inp->inp_cpcbinfo = &tcbinfo[mycpu->gd_cpuid];
958 in_pcbinsconnhash(inp);
961 * We are now on the inpcb's owner CPU, if the cached route was
962 * freed because the rtentry's owner CPU is not the current CPU
963 * (e.g. in tcp_connect()), then we try to reallocate it here with
964 * the hope that a rtentry may be cloned from a RTF_PRCLONING
967 if (!(inp->inp_socket->so_options & SO_DONTROUTE) && /*XXX*/
969 bzero(&ro->ro_dst, sizeof(struct sockaddr_in));
970 ro->ro_dst.sa_family = AF_INET;
971 ro->ro_dst.sa_len = sizeof(struct sockaddr_in);
972 ((struct sockaddr_in *)&ro->ro_dst)->sin_addr =
978 * Now that no more errors can occur, change the protocol processing
979 * port to the current thread (which is the correct thread).
981 * Create TCP timer message now; we are on the tcpcb's owner
984 tcp_create_timermsg(tp, &curthread->td_msgport);
987 * Compute window scaling to request. Use a larger scaling then
988 * needed for the initial receive buffer in case the receive buffer
991 if (tp->request_r_scale < TCP_MIN_WINSHIFT)
992 tp->request_r_scale = TCP_MIN_WINSHIFT;
993 while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
994 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat
996 tp->request_r_scale++;
1000 tcpstat.tcps_connattempt++;
1001 tp->t_state = TCPS_SYN_SENT;
1002 tcp_callout_reset(tp, tp->tt_keep, tp->t_keepinit, tcp_timer_keep);
1003 tp->iss = tcp_new_isn(tp);
1004 tcp_sendseqinit(tp);
1006 ssb_appendstream(&so->so_snd, m);
1008 if (flags & PRUS_OOB)
1009 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc;
1013 * Close the send side of the connection after
1014 * the data is sent if flagged.
1016 if ((flags & (PRUS_OOB|PRUS_EOF)) == PRUS_EOF) {
1018 tp = tcp_usrclosed(tp);
1020 return (tcp_output(tp));
1024 * Common subroutine to open a TCP connection to remote host specified
1025 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local
1026 * port number if needed. Call in_pcbladdr to do the routing and to choose
1027 * a local host address (interface).
1028 * Initialize connection parameters and enter SYN-SENT state.
1031 tcp_connect(netmsg_t msg)
1033 struct socket *so = msg->connect.base.nm_so;
1034 struct sockaddr *nam = msg->connect.nm_nam;
1035 struct thread *td = msg->connect.nm_td;
1036 struct sockaddr_in *sin = (struct sockaddr_in *)nam;
1037 struct sockaddr_in *if_sin;
1040 int error, calc_laddr = 1;
1043 COMMON_START(so, inp, 0);
1046 * Reconnect our pcb if we have to
1048 if (msg->connect.nm_reconnect & NMSG_RECONNECT_RECONNECT) {
1049 msg->connect.nm_reconnect &= ~NMSG_RECONNECT_RECONNECT;
1050 in_pcblink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1054 * Bind if we have to
1056 if (inp->inp_lport == 0) {
1057 if (tcp_lport_extension) {
1058 KKASSERT(inp->inp_laddr.s_addr == INADDR_ANY);
1060 error = in_pcbladdr(inp, nam, &if_sin, td);
1063 inp->inp_laddr.s_addr = if_sin->sin_addr.s_addr;
1065 error = in_pcbconn_bind(inp, nam, td);
1071 error = in_pcbbind(inp, NULL, td);
1079 * Calculate the correct protocol processing thread. The
1080 * connect operation must run there. Set the forwarding
1081 * port before we forward the message or it will get bounced
1084 error = in_pcbladdr(inp, nam, &if_sin, td);
1088 KKASSERT(inp->inp_socket == so);
1090 port = tcp_addrport(sin->sin_addr.s_addr, sin->sin_port,
1091 (inp->inp_laddr.s_addr ?
1092 inp->inp_laddr.s_addr : if_sin->sin_addr.s_addr),
1095 if (port != &curthread->td_msgport) {
1096 struct route *ro = &inp->inp_route;
1099 * in_pcbladdr() may have allocated a route entry for us
1100 * on the current CPU, but we need a route entry on the
1101 * inpcb's owner CPU, so free it here.
1103 if (ro->ro_rt != NULL)
1105 bzero(ro, sizeof(*ro));
1108 * We are moving the protocol processing port the socket
1109 * is on, we have to unlink here and re-link on the
1112 in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1113 sosetport(so, port);
1114 msg->connect.nm_reconnect |= NMSG_RECONNECT_RECONNECT;
1115 msg->connect.base.nm_dispatch = tcp_connect;
1117 lwkt_forwardmsg(port, &msg->connect.base.lmsg);
1118 /* msg invalid now */
1121 error = tcp_connect_oncpu(tp, msg->connect.nm_flags,
1122 msg->connect.nm_m, sin, if_sin);
1123 msg->connect.nm_m = NULL;
1125 if (msg->connect.nm_m) {
1126 m_freem(msg->connect.nm_m);
1127 msg->connect.nm_m = NULL;
1129 if (msg->connect.nm_reconnect & NMSG_RECONNECT_NAMALLOC) {
1130 kfree(msg->connect.nm_nam, M_LWKTMSG);
1131 msg->connect.nm_nam = NULL;
1133 lwkt_replymsg(&msg->connect.base.lmsg, error);
1134 /* msg invalid now */
1140 tcp6_connect(netmsg_t msg)
1143 struct socket *so = msg->connect.base.nm_so;
1144 struct sockaddr *nam = msg->connect.nm_nam;
1145 struct thread *td = msg->connect.nm_td;
1147 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
1148 struct in6_addr *addr6;
1152 COMMON_START(so, inp, 0);
1155 * Reconnect our pcb if we have to
1157 if (msg->connect.nm_reconnect & NMSG_RECONNECT_RECONNECT) {
1158 msg->connect.nm_reconnect &= ~NMSG_RECONNECT_RECONNECT;
1159 in_pcblink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1163 * Bind if we have to
1165 if (inp->inp_lport == 0) {
1166 error = in6_pcbbind(inp, NULL, td);
1172 * Cannot simply call in_pcbconnect, because there might be an
1173 * earlier incarnation of this same connection still in
1174 * TIME_WAIT state, creating an ADDRINUSE error.
1176 error = in6_pcbladdr(inp, nam, &addr6, td);
1180 port = tcp6_addrport(); /* XXX hack for now, always cpu0 */
1182 if (port != &curthread->td_msgport) {
1183 struct route *ro = &inp->inp_route;
1186 * in_pcbladdr() may have allocated a route entry for us
1187 * on the current CPU, but we need a route entry on the
1188 * inpcb's owner CPU, so free it here.
1190 if (ro->ro_rt != NULL)
1192 bzero(ro, sizeof(*ro));
1194 in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1195 sosetport(so, port);
1196 msg->connect.nm_reconnect |= NMSG_RECONNECT_RECONNECT;
1197 msg->connect.base.nm_dispatch = tcp6_connect;
1199 lwkt_forwardmsg(port, &msg->connect.base.lmsg);
1200 /* msg invalid now */
1203 error = tcp6_connect_oncpu(tp, msg->connect.nm_flags,
1204 &msg->connect.nm_m, sin6, addr6);
1205 /* nm_m may still be intact */
1207 if (error && (msg->connect.nm_reconnect & NMSG_RECONNECT_FALLBACK)) {
1209 /* msg invalid now */
1211 if (msg->connect.nm_m) {
1212 m_freem(msg->connect.nm_m);
1213 msg->connect.nm_m = NULL;
1215 if (msg->connect.nm_reconnect & NMSG_RECONNECT_NAMALLOC) {
1216 kfree(msg->connect.nm_nam, M_LWKTMSG);
1217 msg->connect.nm_nam = NULL;
1219 lwkt_replymsg(&msg->connect.base.lmsg, error);
1220 /* msg invalid now */
1225 tcp6_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf **mp,
1226 struct sockaddr_in6 *sin6, struct in6_addr *addr6)
1228 struct mbuf *m = *mp;
1229 struct inpcb *inp = tp->t_inpcb;
1230 struct socket *so = inp->inp_socket;
1234 * Cannot simply call in_pcbconnect, because there might be an
1235 * earlier incarnation of this same connection still in
1236 * TIME_WAIT state, creating an ADDRINUSE error.
1238 oinp = in6_pcblookup_hash(inp->inp_cpcbinfo,
1239 &sin6->sin6_addr, sin6->sin6_port,
1240 (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) ?
1241 addr6 : &inp->in6p_laddr),
1242 inp->inp_lport, 0, NULL);
1244 return (EADDRINUSE);
1246 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
1247 inp->in6p_laddr = *addr6;
1248 inp->in6p_faddr = sin6->sin6_addr;
1249 inp->inp_fport = sin6->sin6_port;
1250 if ((sin6->sin6_flowinfo & IPV6_FLOWINFO_MASK) != 0)
1251 inp->in6p_flowinfo = sin6->sin6_flowinfo;
1252 in_pcbinsconnhash(inp);
1255 * Now that no more errors can occur, change the protocol processing
1256 * port to the current thread (which is the correct thread).
1258 * Create TCP timer message now; we are on the tcpcb's owner
1261 tcp_create_timermsg(tp, &curthread->td_msgport);
1263 /* Compute window scaling to request. */
1264 if (tp->request_r_scale < TCP_MIN_WINSHIFT)
1265 tp->request_r_scale = TCP_MIN_WINSHIFT;
1266 while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1267 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat) {
1268 tp->request_r_scale++;
1272 tcpstat.tcps_connattempt++;
1273 tp->t_state = TCPS_SYN_SENT;
1274 tcp_callout_reset(tp, tp->tt_keep, tp->t_keepinit, tcp_timer_keep);
1275 tp->iss = tcp_new_isn(tp);
1276 tcp_sendseqinit(tp);
1278 ssb_appendstream(&so->so_snd, m);
1280 if (flags & PRUS_OOB)
1281 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc;
1285 * Close the send side of the connection after
1286 * the data is sent if flagged.
1288 if ((flags & (PRUS_OOB|PRUS_EOF)) == PRUS_EOF) {
1290 tp = tcp_usrclosed(tp);
1292 return (tcp_output(tp));
1298 * The new sockopt interface makes it possible for us to block in the
1299 * copyin/out step (if we take a page fault). Taking a page fault while
1300 * in a critical section is probably a Bad Thing. (Since sockets and pcbs
1301 * both now use TSM, there probably isn't any need for this function to
1302 * run in a critical section any more. This needs more examination.)
1305 tcp_ctloutput(netmsg_t msg)
1307 struct socket *so = msg->base.nm_so;
1308 struct sockopt *sopt = msg->ctloutput.nm_sopt;
1309 int error, opt, optval, opthz;
1320 if (sopt->sopt_level != IPPROTO_TCP) {
1322 if (INP_CHECK_SOCKAF(so, AF_INET6))
1323 ip6_ctloutput_dispatch(msg);
1327 /* msg invalid now */
1330 tp = intotcpcb(inp);
1332 switch (sopt->sopt_dir) {
1334 error = soopt_to_kbuf(sopt, &optval, sizeof optval,
1338 switch (sopt->sopt_name) {
1341 tp->t_keepidle = tp->t_keepintvl;
1343 tp->t_keepidle = tcp_keepidle;
1344 tcp_timer_keep_activity(tp, 0);
1346 #ifdef TCP_SIGNATURE
1347 case TCP_SIGNATURE_ENABLE:
1348 if (tp->t_state == TCPS_CLOSED) {
1350 * This is the only safe state that this
1351 * option could be changed. Some segments
1352 * could already have been sent in other
1356 tp->t_flags |= TF_SIGNATURE;
1358 tp->t_flags &= ~TF_SIGNATURE;
1363 #endif /* TCP_SIGNATURE */
1366 switch (sopt->sopt_name) {
1374 opt = 0; /* dead code to fool gcc */
1381 tp->t_flags &= ~opt;
1385 if (tcp_disable_nopush)
1388 tp->t_flags |= TF_NOPUSH;
1390 tp->t_flags &= ~TF_NOPUSH;
1391 error = tcp_output(tp);
1397 * Must be between 0 and maxseg. If the requested
1398 * maxseg is too small to satisfy the desired minmss,
1399 * pump it up (silently so sysctl modifications of
1400 * minmss do not create unexpected program failures).
1401 * Handle degenerate cases.
1403 if (optval > 0 && optval <= tp->t_maxseg) {
1404 if (optval + 40 < tcp_minmss) {
1405 optval = tcp_minmss - 40;
1409 tp->t_maxseg = optval;
1416 opthz = ((int64_t)optval * hz) / 1000;
1418 tp->t_keepinit = opthz;
1424 opthz = ((int64_t)optval * hz) / 1000;
1426 tp->t_keepidle = opthz;
1427 tcp_timer_keep_activity(tp, 0);
1434 opthz = ((int64_t)optval * hz) / 1000;
1436 tp->t_keepintvl = opthz;
1437 tp->t_maxidle = tp->t_keepintvl * tp->t_keepcnt;
1445 tp->t_keepcnt = optval;
1446 tp->t_maxidle = tp->t_keepintvl * tp->t_keepcnt;
1453 error = ENOPROTOOPT;
1459 switch (sopt->sopt_name) {
1460 #ifdef TCP_SIGNATURE
1461 case TCP_SIGNATURE_ENABLE:
1462 optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0;
1464 #endif /* TCP_SIGNATURE */
1466 optval = tp->t_flags & TF_NODELAY;
1469 optval = tp->t_maxseg;
1472 optval = tp->t_flags & TF_NOOPT;
1475 optval = tp->t_flags & TF_NOPUSH;
1478 optval = ((int64_t)tp->t_keepinit * 1000) / hz;
1481 optval = ((int64_t)tp->t_keepidle * 1000) / hz;
1484 optval = ((int64_t)tp->t_keepintvl * 1000) / hz;
1487 optval = tp->t_keepcnt;
1490 error = ENOPROTOOPT;
1494 soopt_from_kbuf(sopt, &optval, sizeof optval);
1498 lwkt_replymsg(&msg->lmsg, error);
1502 * tcp_sendspace and tcp_recvspace are the default send and receive window
1503 * sizes, respectively. These are obsolescent (this information should
1504 * be set by the route).
1506 * Use a default that does not require tcp window scaling to be turned
1507 * on. Individual programs or the administrator can increase the default.
1509 u_long tcp_sendspace = 57344; /* largest multiple of PAGE_SIZE < 64k */
1510 SYSCTL_INT(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW,
1511 &tcp_sendspace , 0, "Maximum outgoing TCP datagram size");
1512 u_long tcp_recvspace = 57344; /* largest multiple of PAGE_SIZE < 64k */
1513 SYSCTL_INT(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
1514 &tcp_recvspace , 0, "Maximum incoming TCP datagram size");
1517 * Attach TCP protocol to socket, allocating internet protocol control
1518 * block, tcp control block, bufer space, and entering LISTEN state
1519 * if to accept connections.
1522 tcp_attach(struct socket *so, struct pru_attach_info *ai)
1529 int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6) != 0;
1532 if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) {
1533 lwkt_gettoken(&so->so_rcv.ssb_token);
1534 error = soreserve(so, tcp_sendspace, tcp_recvspace,
1536 lwkt_reltoken(&so->so_rcv.ssb_token);
1540 atomic_set_int(&so->so_rcv.ssb_flags, SSB_AUTOSIZE);
1541 atomic_set_int(&so->so_snd.ssb_flags, SSB_AUTOSIZE);
1542 cpu = mycpu->gd_cpuid;
1545 * Set the default port for protocol processing. This will likely
1546 * change when we connect.
1548 error = in_pcballoc(so, &tcbinfo[cpu]);
1554 inp->inp_vflag |= INP_IPV6;
1555 inp->in6p_hops = -1; /* use kernel default */
1559 inp->inp_vflag |= INP_IPV4;
1560 tp = tcp_newtcpcb(inp);
1563 * Make sure the socket is destroyed by the pcbdetach.
1572 sofree(so); /* from ref above */
1575 tp->t_state = TCPS_CLOSED;
1576 /* Keep a reference for asynchronized pru_rcvd */
1582 * Initiate (or continue) disconnect.
1583 * If embryonic state, just send reset (once).
1584 * If in ``let data drain'' option and linger null, just drop.
1585 * Otherwise (hard), mark socket disconnecting and drop
1586 * current input data; switch states based on user close, and
1587 * send segment to peer (with FIN).
1589 static struct tcpcb *
1590 tcp_disconnect(struct tcpcb *tp)
1592 struct socket *so = tp->t_inpcb->inp_socket;
1594 if (tp->t_state < TCPS_ESTABLISHED) {
1596 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
1597 tp = tcp_drop(tp, 0);
1599 lwkt_gettoken(&so->so_rcv.ssb_token);
1600 soisdisconnecting(so);
1601 sbflush(&so->so_rcv.sb);
1602 tp = tcp_usrclosed(tp);
1605 lwkt_reltoken(&so->so_rcv.ssb_token);
1611 * User issued close, and wish to trail through shutdown states:
1612 * if never received SYN, just forget it. If got a SYN from peer,
1613 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
1614 * If already got a FIN from peer, then almost done; go to LAST_ACK
1615 * state. In all other cases, have already sent FIN to peer (e.g.
1616 * after PRU_SHUTDOWN), and just have to play tedious game waiting
1617 * for peer to send FIN or not respond to keep-alives, etc.
1618 * We can let the user exit from the close as soon as the FIN is acked.
1620 static struct tcpcb *
1621 tcp_usrclosed(struct tcpcb *tp)
1624 switch (tp->t_state) {
1628 tp->t_state = TCPS_CLOSED;
1633 case TCPS_SYN_RECEIVED:
1634 tp->t_flags |= TF_NEEDFIN;
1637 case TCPS_ESTABLISHED:
1638 tp->t_state = TCPS_FIN_WAIT_1;
1641 case TCPS_CLOSE_WAIT:
1642 tp->t_state = TCPS_LAST_ACK;
1645 if (tp && tp->t_state >= TCPS_FIN_WAIT_2) {
1646 soisdisconnected(tp->t_inpcb->inp_socket);
1647 /* To prevent the connection hanging in FIN_WAIT_2 forever. */
1648 if (tp->t_state == TCPS_FIN_WAIT_2) {
1649 tcp_callout_reset(tp, tp->tt_2msl, tp->t_maxidle,