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
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62 * From: @(#)tcp_usrreq.c 8.2 (Berkeley) 1/3/94
63 * $FreeBSD: src/sys/netinet/tcp_usrreq.c,v 1.51.2.17 2002/10/11 11:46:44 ume Exp $
66 #include "opt_ipsec.h"
68 #include "opt_inet6.h"
69 #include "opt_tcpdebug.h"
71 #include <sys/param.h>
72 #include <sys/systm.h>
73 #include <sys/kernel.h>
74 #include <sys/malloc.h>
75 #include <sys/sysctl.h>
76 #include <sys/globaldata.h>
77 #include <sys/thread.h>
81 #include <sys/domain.h>
83 #include <sys/socket.h>
84 #include <sys/socketvar.h>
85 #include <sys/socketops.h>
86 #include <sys/protosw.h>
88 #include <sys/thread2.h>
89 #include <sys/msgport2.h>
90 #include <sys/socketvar2.h>
93 #include <net/netisr.h>
94 #include <net/route.h>
96 #include <net/netmsg2.h>
97 #include <net/netisr2.h>
99 #include <netinet/in.h>
100 #include <netinet/in_systm.h>
102 #include <netinet/ip6.h>
104 #include <netinet/in_pcb.h>
106 #include <netinet6/in6_pcb.h>
108 #include <netinet/in_var.h>
109 #include <netinet/ip_var.h>
111 #include <netinet6/ip6_var.h>
112 #include <netinet6/tcp6_var.h>
114 #include <netinet/tcp.h>
115 #include <netinet/tcp_fsm.h>
116 #include <netinet/tcp_seq.h>
117 #include <netinet/tcp_timer.h>
118 #include <netinet/tcp_timer2.h>
119 #include <netinet/tcp_var.h>
120 #include <netinet/tcpip.h>
122 #include <netinet/tcp_debug.h>
126 #include <netinet6/ipsec.h>
130 * TCP protocol interface to socket abstraction.
132 extern char *tcpstates[]; /* XXX ??? */
134 static int tcp_attach (struct socket *, struct pru_attach_info *);
135 static void tcp_connect (netmsg_t msg);
137 static void tcp6_connect (netmsg_t msg);
138 static int tcp6_connect_oncpu(struct tcpcb *tp, int flags,
140 struct sockaddr_in6 *sin6,
141 struct in6_addr *addr6);
143 static struct tcpcb *
144 tcp_disconnect (struct tcpcb *);
145 static struct tcpcb *
146 tcp_usrclosed (struct tcpcb *);
149 #define TCPDEBUG0 int ostate = 0
150 #define TCPDEBUG1() ostate = tp ? tp->t_state : 0
151 #define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \
152 tcp_trace(TA_USER, ostate, tp, 0, 0, req)
156 #define TCPDEBUG2(req)
159 static int tcp_lport_extension = 1;
160 SYSCTL_INT(_net_inet_tcp, OID_AUTO, lportext, CTLFLAG_RW,
161 &tcp_lport_extension, 0, "");
164 * For some ill optimized programs, which try to use TCP_NOPUSH
165 * to improve performance, will have small amount of data sits
166 * in the sending buffer. These small amount of data will _not_
167 * be pushed into the network until more data are written into
168 * the socket or the socket write side is shutdown.
170 static int tcp_disable_nopush = 1;
171 SYSCTL_INT(_net_inet_tcp, OID_AUTO, disable_nopush, CTLFLAG_RW,
172 &tcp_disable_nopush, 0, "TCP_NOPUSH socket option will have no effect");
175 * TCP attaches to socket via pru_attach(), reserving space,
176 * and an internet control block. This is likely occuring on
177 * cpu0 and may have to move later when we bind/connect.
180 tcp_usr_attach(netmsg_t msg)
182 struct socket *so = msg->base.nm_so;
183 struct pru_attach_info *ai = msg->attach.nm_ai;
186 struct tcpcb *tp = NULL;
197 error = tcp_attach(so, ai);
201 if ((so->so_options & SO_LINGER) && so->so_linger == 0)
202 so->so_linger = TCP_LINGERTIME;
205 sofree(so); /* from ref above */
206 TCPDEBUG2(PRU_ATTACH);
207 lwkt_replymsg(&msg->lmsg, error);
211 * pru_detach() detaches the TCP protocol from the socket.
212 * If the protocol state is non-embryonic, then can't
213 * do this directly: have to initiate a pru_disconnect(),
214 * which may finish later; embryonic TCB's can just
218 tcp_usr_detach(netmsg_t msg)
220 struct socket *so = msg->base.nm_so;
229 * If the inp is already detached it may have been due to an async
230 * close. Just return as if no error occured.
232 * It's possible for the tcpcb (tp) to disconnect from the inp due
233 * to tcp_drop()->tcp_close() being called. This may occur *after*
234 * the detach message has been queued so we may find a NULL tp here.
237 if ((tp = intotcpcb(inp)) != NULL) {
239 tp = tcp_disconnect(tp);
240 TCPDEBUG2(PRU_DETACH);
243 lwkt_replymsg(&msg->lmsg, error);
247 * NOTE: ignore_error is non-zero for certain disconnection races
248 * which we want to silently allow, otherwise close() may return
249 * an unexpected error.
251 * NOTE: The variables (msg) and (tp) are assumed.
253 #define COMMON_START(so, inp, ignore_error) \
259 error = ignore_error ? 0 : EINVAL; \
263 tp = intotcpcb(inp); \
267 #define COMMON_END1(req, noreply) \
271 lwkt_replymsg(&msg->lmsg, error); \
275 #define COMMON_END(req) COMMON_END1((req), 0)
278 * Give the socket an address.
281 tcp_usr_bind(netmsg_t msg)
283 struct socket *so = msg->bind.base.nm_so;
284 struct sockaddr *nam = msg->bind.nm_nam;
285 struct thread *td = msg->bind.nm_td;
289 struct sockaddr_in *sinp;
291 COMMON_START(so, inp, 0);
294 * Must check for multicast addresses and disallow binding
297 sinp = (struct sockaddr_in *)nam;
298 if (sinp->sin_family == AF_INET &&
299 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
300 error = EAFNOSUPPORT;
303 error = in_pcbbind(inp, nam, td);
306 COMMON_END(PRU_BIND);
313 tcp6_usr_bind(netmsg_t msg)
315 struct socket *so = msg->bind.base.nm_so;
316 struct sockaddr *nam = msg->bind.nm_nam;
317 struct thread *td = msg->bind.nm_td;
321 struct sockaddr_in6 *sin6p;
323 COMMON_START(so, inp, 0);
326 * Must check for multicast addresses and disallow binding
329 sin6p = (struct sockaddr_in6 *)nam;
330 if (sin6p->sin6_family == AF_INET6 &&
331 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
332 error = EAFNOSUPPORT;
335 inp->inp_vflag &= ~INP_IPV4;
336 inp->inp_vflag |= INP_IPV6;
337 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
338 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr))
339 inp->inp_vflag |= INP_IPV4;
340 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
341 struct sockaddr_in sin;
343 in6_sin6_2_sin(&sin, sin6p);
344 inp->inp_vflag |= INP_IPV4;
345 inp->inp_vflag &= ~INP_IPV6;
346 error = in_pcbbind(inp, (struct sockaddr *)&sin, td);
350 error = in6_pcbbind(inp, nam, td);
353 COMMON_END(PRU_BIND);
357 struct netmsg_inswildcard {
358 struct netmsg_base base;
359 struct inpcb *nm_inp;
363 in_pcbinswildcardhash_handler(netmsg_t msg)
365 struct netmsg_inswildcard *nm = (struct netmsg_inswildcard *)msg;
366 int cpu = mycpuid, nextcpu;
368 in_pcbinswildcardhash_oncpu(nm->nm_inp, &tcbinfo[cpu]);
371 if (nextcpu < ncpus2)
372 lwkt_forwardmsg(netisr_cpuport(nextcpu), &nm->base.lmsg);
374 lwkt_replymsg(&nm->base.lmsg, 0);
378 * Prepare to accept connections.
381 tcp_usr_listen(netmsg_t msg)
383 struct socket *so = msg->listen.base.nm_so;
384 struct thread *td = msg->listen.nm_td;
388 struct netmsg_inswildcard nm;
389 lwkt_port_t port0 = netisr_cpuport(0);
391 COMMON_START(so, inp, 0);
393 if (&curthread->td_msgport != port0) {
394 KASSERT((msg->listen.nm_flags & PRUL_RELINK) == 0,
395 ("already asked to relink"));
397 in_pcbunlink(so->so_pcb, &tcbinfo[mycpuid]);
398 sosetport(so, port0);
399 msg->listen.nm_flags |= PRUL_RELINK;
401 lwkt_forwardmsg(port0, &msg->listen.base.lmsg);
402 /* msg invalid now */
405 KASSERT(so->so_port == port0, ("so_port is not netisr0"));
407 if (msg->listen.nm_flags & PRUL_RELINK) {
408 msg->listen.nm_flags &= ~PRUL_RELINK;
409 in_pcblink(so->so_pcb, &tcbinfo[mycpuid]);
411 KASSERT(inp->inp_pcbinfo == &tcbinfo[0], ("pcbinfo is not tcbinfo0"));
412 KASSERT(inp->inp_cpcbinfo == &tcbinfo[0], ("cpcbinfo is not tcbinfo0"));
414 if (tp->t_flags & TF_LISTEN)
417 if (inp->inp_lport == 0) {
418 error = in_pcbbind(inp, NULL, td);
423 tp->t_state = TCPS_LISTEN;
424 tp->t_flags |= TF_LISTEN;
425 tp->tt_msg = NULL; /* Catch any invalid timer usage */
429 * We have to set the flag because we can't have other cpus
430 * messing with our inp's flags.
432 KASSERT(!(inp->inp_flags & INP_CONNECTED),
433 ("already on connhash"));
434 KASSERT(!(inp->inp_flags & INP_WILDCARD),
435 ("already on wildcardhash"));
436 KASSERT(!(inp->inp_flags & INP_WILDCARD_MP),
437 ("already on MP wildcardhash"));
438 inp->inp_flags |= INP_WILDCARD_MP;
440 netmsg_init(&nm.base, NULL, &curthread->td_msgport,
441 MSGF_PRIORITY, in_pcbinswildcardhash_handler);
443 lwkt_domsg(netisr_cpuport(1), &nm.base.lmsg, 0);
445 in_pcbinswildcardhash(inp);
446 COMMON_END(PRU_LISTEN);
452 tcp6_usr_listen(netmsg_t msg)
454 struct socket *so = msg->listen.base.nm_so;
455 struct thread *td = msg->listen.nm_td;
459 struct netmsg_inswildcard nm;
461 COMMON_START(so, inp, 0);
463 if (tp->t_flags & TF_LISTEN)
466 if (inp->inp_lport == 0) {
467 if (!(inp->inp_flags & IN6P_IPV6_V6ONLY))
468 inp->inp_vflag |= INP_IPV4;
470 inp->inp_vflag &= ~INP_IPV4;
471 error = in6_pcbbind(inp, NULL, td);
476 tp->t_state = TCPS_LISTEN;
477 tp->t_flags |= TF_LISTEN;
478 tp->tt_msg = NULL; /* Catch any invalid timer usage */
482 * We have to set the flag because we can't have other cpus
483 * messing with our inp's flags.
485 KASSERT(!(inp->inp_flags & INP_CONNECTED),
486 ("already on connhash"));
487 KASSERT(!(inp->inp_flags & INP_WILDCARD),
488 ("already on wildcardhash"));
489 KASSERT(!(inp->inp_flags & INP_WILDCARD_MP),
490 ("already on MP wildcardhash"));
491 inp->inp_flags |= INP_WILDCARD_MP;
493 KKASSERT(so->so_port == netisr_cpuport(0));
494 KKASSERT(&curthread->td_msgport == netisr_cpuport(0));
495 KKASSERT(inp->inp_pcbinfo == &tcbinfo[0]);
497 netmsg_init(&nm.base, NULL, &curthread->td_msgport,
498 MSGF_PRIORITY, in_pcbinswildcardhash_handler);
500 lwkt_domsg(netisr_cpuport(1), &nm.base.lmsg, 0);
502 in_pcbinswildcardhash(inp);
503 COMMON_END(PRU_LISTEN);
508 * Initiate connection to peer.
509 * Create a template for use in transmissions on this connection.
510 * Enter SYN_SENT state, and mark socket as connecting.
511 * Start keep-alive timer, and seed output sequence space.
512 * Send initial segment on connection.
515 tcp_usr_connect(netmsg_t msg)
517 struct socket *so = msg->connect.base.nm_so;
518 struct sockaddr *nam = msg->connect.nm_nam;
519 struct thread *td = msg->connect.nm_td;
523 struct sockaddr_in *sinp;
525 COMMON_START(so, inp, 0);
528 * Must disallow TCP ``connections'' to multicast addresses.
530 sinp = (struct sockaddr_in *)nam;
531 if (sinp->sin_family == AF_INET
532 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
533 error = EAFNOSUPPORT;
537 if (!prison_remote_ip(td, (struct sockaddr*)sinp)) {
538 error = EAFNOSUPPORT; /* IPv6 only jail */
543 /* msg is invalid now */
546 if (msg->connect.nm_m) {
547 m_freem(msg->connect.nm_m);
548 msg->connect.nm_m = NULL;
550 if (msg->connect.nm_flags & PRUC_HELDTD)
552 if (error && (msg->connect.nm_flags & PRUC_ASYNC)) {
553 so->so_error = error;
554 soisdisconnected(so);
556 lwkt_replymsg(&msg->lmsg, error);
562 tcp6_usr_connect(netmsg_t msg)
564 struct socket *so = msg->connect.base.nm_so;
565 struct sockaddr *nam = msg->connect.nm_nam;
566 struct thread *td = msg->connect.nm_td;
570 struct sockaddr_in6 *sin6p;
572 COMMON_START(so, inp, 0);
575 * Must disallow TCP ``connections'' to multicast addresses.
577 sin6p = (struct sockaddr_in6 *)nam;
578 if (sin6p->sin6_family == AF_INET6
579 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
580 error = EAFNOSUPPORT;
584 if (!prison_remote_ip(td, nam)) {
585 error = EAFNOSUPPORT; /* IPv4 only jail */
589 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
590 struct sockaddr_in *sinp;
592 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
596 sinp = kmalloc(sizeof(*sinp), M_LWKTMSG, M_INTWAIT);
597 in6_sin6_2_sin(sinp, sin6p);
598 inp->inp_vflag |= INP_IPV4;
599 inp->inp_vflag &= ~INP_IPV6;
600 msg->connect.nm_nam = (struct sockaddr *)sinp;
601 msg->connect.nm_flags |= PRUC_NAMALLOC;
603 /* msg is invalid now */
606 inp->inp_vflag &= ~INP_IPV4;
607 inp->inp_vflag |= INP_IPV6;
608 inp->inp_inc.inc_isipv6 = 1;
610 msg->connect.nm_flags |= PRUC_FALLBACK;
612 /* msg is invalid now */
615 if (msg->connect.nm_m) {
616 m_freem(msg->connect.nm_m);
617 msg->connect.nm_m = NULL;
619 lwkt_replymsg(&msg->lmsg, error);
625 * Initiate disconnect from peer.
626 * If connection never passed embryonic stage, just drop;
627 * else if don't need to let data drain, then can just drop anyways,
628 * else have to begin TCP shutdown process: mark socket disconnecting,
629 * drain unread data, state switch to reflect user close, and
630 * send segment (e.g. FIN) to peer. Socket will be really disconnected
631 * when peer sends FIN and acks ours.
633 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
636 tcp_usr_disconnect(netmsg_t msg)
638 struct socket *so = msg->disconnect.base.nm_so;
643 COMMON_START(so, inp, 1);
644 tp = tcp_disconnect(tp);
645 COMMON_END(PRU_DISCONNECT);
649 * Accept a connection. Essentially all the work is
650 * done at higher levels; just return the address
651 * of the peer, storing through addr.
654 tcp_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;
664 if (so->so_state & SS_ISDISCONNECTED) {
665 error = ECONNABORTED;
675 in_setpeeraddr(so, nam);
676 COMMON_END(PRU_ACCEPT);
681 tcp6_usr_accept(netmsg_t msg)
683 struct socket *so = msg->accept.base.nm_so;
684 struct sockaddr **nam = msg->accept.nm_nam;
687 struct tcpcb *tp = NULL;
692 if (so->so_state & SS_ISDISCONNECTED) {
693 error = ECONNABORTED;
702 in6_mapped_peeraddr(so, nam);
703 COMMON_END(PRU_ACCEPT);
707 * Mark the connection as being incapable of further output.
710 tcp_usr_shutdown(netmsg_t msg)
712 struct socket *so = msg->shutdown.base.nm_so;
717 COMMON_START(so, inp, 0);
719 tp = tcp_usrclosed(tp);
721 error = tcp_output(tp);
722 COMMON_END(PRU_SHUTDOWN);
726 * After a receive, possibly send window update to peer.
729 tcp_usr_rcvd(netmsg_t msg)
731 struct socket *so = msg->rcvd.base.nm_so;
732 int error = 0, noreply = 0;
736 COMMON_START(so, inp, 0);
738 if (msg->rcvd.nm_pru_flags & PRUR_ASYNC) {
740 so_async_rcvd_reply(so);
744 COMMON_END1(PRU_RCVD, noreply);
748 * Do a send by putting data in output queue and updating urgent
749 * marker if URG set. Possibly send more data. Unlike the other
750 * pru_*() routines, the mbuf chains are our responsibility. We
751 * must either enqueue them or free them. The other pru_* routines
752 * generally are caller-frees.
755 tcp_usr_send(netmsg_t msg)
757 struct socket *so = msg->send.base.nm_so;
758 int flags = msg->send.nm_flags;
759 struct mbuf *m = msg->send.nm_m;
765 KKASSERT(msg->send.nm_control == NULL);
766 KKASSERT(msg->send.nm_addr == NULL);
767 KKASSERT((flags & PRUS_FREEADDR) == 0);
773 * OOPS! we lost a race, the TCP session got reset after
774 * we checked SS_CANTSENDMORE, eg: while doing uiomove or a
775 * network interrupt in the non-critical section of sosend().
778 error = ECONNRESET; /* XXX EPIPE? */
788 * This is no longer necessary, since:
789 * - sosendtcp() has already checked it for us
790 * - It does not work with asynchronized send
794 * Don't let too much OOB data build up
796 if (flags & PRUS_OOB) {
797 if (ssb_space(&so->so_snd) < -512) {
806 * Pump the data into the socket.
809 ssb_appendstream(&so->so_snd, m);
810 if (flags & PRUS_OOB) {
812 * According to RFC961 (Assigned Protocols),
813 * the urgent pointer points to the last octet
814 * of urgent data. We continue, however,
815 * to consider it to indicate the first octet
816 * of data past the urgent section.
817 * Otherwise, snd_up should be one lower.
819 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc;
820 tp->t_flags |= TF_FORCE;
821 error = tcp_output(tp);
822 tp->t_flags &= ~TF_FORCE;
824 if (flags & PRUS_EOF) {
826 * Close the send side of the connection after
830 tp = tcp_usrclosed(tp);
832 if (tp != NULL && !tcp_output_pending(tp)) {
833 if (flags & PRUS_MORETOCOME)
834 tp->t_flags |= TF_MORETOCOME;
835 error = tcp_output_fair(tp);
836 if (flags & PRUS_MORETOCOME)
837 tp->t_flags &= ~TF_MORETOCOME;
840 COMMON_END1((flags & PRUS_OOB) ? PRU_SENDOOB :
841 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND),
842 (flags & PRUS_NOREPLY));
846 * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort()
847 * will sofree() it when we return.
850 tcp_usr_abort(netmsg_t msg)
852 struct socket *so = msg->abort.base.nm_so;
857 COMMON_START(so, inp, 1);
858 tp = tcp_drop(tp, ECONNABORTED);
859 COMMON_END(PRU_ABORT);
863 * Receive out-of-band data.
866 tcp_usr_rcvoob(netmsg_t msg)
868 struct socket *so = msg->rcvoob.base.nm_so;
869 struct mbuf *m = msg->rcvoob.nm_m;
870 int flags = msg->rcvoob.nm_flags;
875 COMMON_START(so, inp, 0);
876 if ((so->so_oobmark == 0 &&
877 (so->so_state & SS_RCVATMARK) == 0) ||
878 so->so_options & SO_OOBINLINE ||
879 tp->t_oobflags & TCPOOB_HADDATA) {
883 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
888 *mtod(m, caddr_t) = tp->t_iobc;
889 if ((flags & MSG_PEEK) == 0)
890 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
891 COMMON_END(PRU_RCVOOB);
895 tcp_usr_savefaddr(struct socket *so, const struct sockaddr *faddr)
897 in_savefaddr(so, faddr);
902 tcp6_usr_savefaddr(struct socket *so, const struct sockaddr *faddr)
904 in6_mapped_savefaddr(so, faddr);
909 tcp_usr_preconnect(struct socket *so, const struct sockaddr *nam,
910 struct thread *td __unused)
912 const struct sockaddr_in *sinp;
914 sinp = (const struct sockaddr_in *)nam;
915 if (sinp->sin_family == AF_INET &&
916 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
923 /* xxx - should be const */
924 struct pr_usrreqs tcp_usrreqs = {
925 .pru_abort = tcp_usr_abort,
926 .pru_accept = tcp_usr_accept,
927 .pru_attach = tcp_usr_attach,
928 .pru_bind = tcp_usr_bind,
929 .pru_connect = tcp_usr_connect,
930 .pru_connect2 = pr_generic_notsupp,
931 .pru_control = in_control_dispatch,
932 .pru_detach = tcp_usr_detach,
933 .pru_disconnect = tcp_usr_disconnect,
934 .pru_listen = tcp_usr_listen,
935 .pru_peeraddr = in_setpeeraddr_dispatch,
936 .pru_rcvd = tcp_usr_rcvd,
937 .pru_rcvoob = tcp_usr_rcvoob,
938 .pru_send = tcp_usr_send,
939 .pru_sense = pru_sense_null,
940 .pru_shutdown = tcp_usr_shutdown,
941 .pru_sockaddr = in_setsockaddr_dispatch,
942 .pru_sosend = sosendtcp,
943 .pru_soreceive = sorecvtcp,
944 .pru_savefaddr = tcp_usr_savefaddr,
945 .pru_preconnect = tcp_usr_preconnect
949 struct pr_usrreqs tcp6_usrreqs = {
950 .pru_abort = tcp_usr_abort,
951 .pru_accept = tcp6_usr_accept,
952 .pru_attach = tcp_usr_attach,
953 .pru_bind = tcp6_usr_bind,
954 .pru_connect = tcp6_usr_connect,
955 .pru_connect2 = pr_generic_notsupp,
956 .pru_control = in6_control_dispatch,
957 .pru_detach = tcp_usr_detach,
958 .pru_disconnect = tcp_usr_disconnect,
959 .pru_listen = tcp6_usr_listen,
960 .pru_peeraddr = in6_mapped_peeraddr_dispatch,
961 .pru_rcvd = tcp_usr_rcvd,
962 .pru_rcvoob = tcp_usr_rcvoob,
963 .pru_send = tcp_usr_send,
964 .pru_sense = pru_sense_null,
965 .pru_shutdown = tcp_usr_shutdown,
966 .pru_sockaddr = in6_mapped_sockaddr_dispatch,
967 .pru_sosend = sosendtcp,
968 .pru_soreceive = sorecvtcp,
969 .pru_savefaddr = tcp6_usr_savefaddr
974 tcp_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf *m,
975 struct sockaddr_in *sin, struct sockaddr_in *if_sin)
977 struct inpcb *inp = tp->t_inpcb, *oinp;
978 struct socket *so = inp->inp_socket;
979 struct route *ro = &inp->inp_route;
981 KASSERT(inp->inp_cpcbinfo == &tcbinfo[mycpu->gd_cpuid],
982 ("cpcbinfo mismatch"));
984 oinp = in_pcblookup_hash(inp->inp_cpcbinfo,
985 sin->sin_addr, sin->sin_port,
986 (inp->inp_laddr.s_addr != INADDR_ANY ?
987 inp->inp_laddr : if_sin->sin_addr),
988 inp->inp_lport, 0, NULL);
993 if (inp->inp_laddr.s_addr == INADDR_ANY)
994 inp->inp_laddr = if_sin->sin_addr;
995 inp->inp_faddr = sin->sin_addr;
996 inp->inp_fport = sin->sin_port;
997 in_pcbinsconnhash(inp);
1000 * We are now on the inpcb's owner CPU, if the cached route was
1001 * freed because the rtentry's owner CPU is not the current CPU
1002 * (e.g. in tcp_connect()), then we try to reallocate it here with
1003 * the hope that a rtentry may be cloned from a RTF_PRCLONING
1006 if (!(inp->inp_socket->so_options & SO_DONTROUTE) && /*XXX*/
1007 ro->ro_rt == NULL) {
1008 bzero(&ro->ro_dst, sizeof(struct sockaddr_in));
1009 ro->ro_dst.sa_family = AF_INET;
1010 ro->ro_dst.sa_len = sizeof(struct sockaddr_in);
1011 ((struct sockaddr_in *)&ro->ro_dst)->sin_addr =
1017 * Now that no more errors can occur, change the protocol processing
1018 * port to the current thread (which is the correct thread).
1020 * Create TCP timer message now; we are on the tcpcb's owner
1023 tcp_create_timermsg(tp, &curthread->td_msgport);
1026 * Compute window scaling to request. Use a larger scaling then
1027 * needed for the initial receive buffer in case the receive buffer
1030 if (tp->request_r_scale < TCP_MIN_WINSHIFT)
1031 tp->request_r_scale = TCP_MIN_WINSHIFT;
1032 while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1033 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat
1035 tp->request_r_scale++;
1039 tcpstat.tcps_connattempt++;
1040 tp->t_state = TCPS_SYN_SENT;
1041 tcp_callout_reset(tp, tp->tt_keep, tp->t_keepinit, tcp_timer_keep);
1042 tp->iss = tcp_new_isn(tp);
1043 tcp_sendseqinit(tp);
1045 ssb_appendstream(&so->so_snd, m);
1047 if (flags & PRUS_OOB)
1048 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc;
1052 * Close the send side of the connection after
1053 * the data is sent if flagged.
1055 if ((flags & (PRUS_OOB|PRUS_EOF)) == PRUS_EOF) {
1057 tp = tcp_usrclosed(tp);
1059 return (tcp_output(tp));
1063 * Common subroutine to open a TCP connection to remote host specified
1064 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local
1065 * port number if needed. Call in_pcbladdr to do the routing and to choose
1066 * a local host address (interface).
1067 * Initialize connection parameters and enter SYN-SENT state.
1070 tcp_connect(netmsg_t msg)
1072 struct socket *so = msg->connect.base.nm_so;
1073 struct sockaddr *nam = msg->connect.nm_nam;
1074 struct thread *td = msg->connect.nm_td;
1075 struct sockaddr_in *sin = (struct sockaddr_in *)nam;
1076 struct sockaddr_in *if_sin;
1079 int error, calc_laddr = 1;
1082 COMMON_START(so, inp, 0);
1085 * Reconnect our pcb if we have to
1087 if (msg->connect.nm_flags & PRUC_RECONNECT) {
1088 msg->connect.nm_flags &= ~PRUC_RECONNECT;
1089 in_pcblink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1093 * Bind if we have to
1095 if (inp->inp_lport == 0) {
1096 if (tcp_lport_extension) {
1097 KKASSERT(inp->inp_laddr.s_addr == INADDR_ANY);
1099 error = in_pcbladdr(inp, nam, &if_sin, td);
1102 inp->inp_laddr.s_addr = if_sin->sin_addr.s_addr;
1104 error = in_pcbconn_bind(inp, nam, td);
1110 error = in_pcbbind(inp, NULL, td);
1118 * Calculate the correct protocol processing thread. The
1119 * connect operation must run there. Set the forwarding
1120 * port before we forward the message or it will get bounced
1123 error = in_pcbladdr(inp, nam, &if_sin, td);
1127 KKASSERT(inp->inp_socket == so);
1129 port = tcp_addrport(sin->sin_addr.s_addr, sin->sin_port,
1130 (inp->inp_laddr.s_addr ?
1131 inp->inp_laddr.s_addr : if_sin->sin_addr.s_addr),
1134 if (port != &curthread->td_msgport) {
1135 struct route *ro = &inp->inp_route;
1138 * in_pcbladdr() may have allocated a route entry for us
1139 * on the current CPU, but we need a route entry on the
1140 * inpcb's owner CPU, so free it here.
1142 if (ro->ro_rt != NULL)
1144 bzero(ro, sizeof(*ro));
1147 * We are moving the protocol processing port the socket
1148 * is on, we have to unlink here and re-link on the
1151 in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1152 sosetport(so, port);
1153 msg->connect.nm_flags |= PRUC_RECONNECT;
1154 msg->connect.base.nm_dispatch = tcp_connect;
1156 lwkt_forwardmsg(port, &msg->connect.base.lmsg);
1157 /* msg invalid now */
1159 } else if (msg->connect.nm_flags & PRUC_HELDTD) {
1161 * The original thread is no longer needed; release it.
1164 msg->connect.nm_flags &= ~PRUC_HELDTD;
1166 error = tcp_connect_oncpu(tp, msg->connect.nm_sndflags,
1167 msg->connect.nm_m, sin, if_sin);
1168 msg->connect.nm_m = NULL;
1170 if (msg->connect.nm_m) {
1171 m_freem(msg->connect.nm_m);
1172 msg->connect.nm_m = NULL;
1174 if (msg->connect.nm_flags & PRUC_NAMALLOC) {
1175 kfree(msg->connect.nm_nam, M_LWKTMSG);
1176 msg->connect.nm_nam = NULL;
1178 if (msg->connect.nm_flags & PRUC_HELDTD)
1180 if (error && (msg->connect.nm_flags & PRUC_ASYNC)) {
1181 so->so_error = error;
1182 soisdisconnected(so);
1184 lwkt_replymsg(&msg->connect.base.lmsg, error);
1185 /* msg invalid now */
1191 tcp6_connect(netmsg_t msg)
1194 struct socket *so = msg->connect.base.nm_so;
1195 struct sockaddr *nam = msg->connect.nm_nam;
1196 struct thread *td = msg->connect.nm_td;
1198 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
1199 struct in6_addr *addr6;
1203 COMMON_START(so, inp, 0);
1206 * Reconnect our pcb if we have to
1208 if (msg->connect.nm_flags & PRUC_RECONNECT) {
1209 msg->connect.nm_flags &= ~PRUC_RECONNECT;
1210 in_pcblink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1214 * Bind if we have to
1216 if (inp->inp_lport == 0) {
1217 error = in6_pcbbind(inp, NULL, td);
1223 * Cannot simply call in_pcbconnect, because there might be an
1224 * earlier incarnation of this same connection still in
1225 * TIME_WAIT state, creating an ADDRINUSE error.
1227 error = in6_pcbladdr(inp, nam, &addr6, td);
1231 port = tcp6_addrport(); /* XXX hack for now, always cpu0 */
1233 if (port != &curthread->td_msgport) {
1234 struct route *ro = &inp->inp_route;
1237 * in_pcbladdr() may have allocated a route entry for us
1238 * on the current CPU, but we need a route entry on the
1239 * inpcb's owner CPU, so free it here.
1241 if (ro->ro_rt != NULL)
1243 bzero(ro, sizeof(*ro));
1245 in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1246 sosetport(so, port);
1247 msg->connect.nm_flags |= PRUC_RECONNECT;
1248 msg->connect.base.nm_dispatch = tcp6_connect;
1250 lwkt_forwardmsg(port, &msg->connect.base.lmsg);
1251 /* msg invalid now */
1254 error = tcp6_connect_oncpu(tp, msg->connect.nm_sndflags,
1255 &msg->connect.nm_m, sin6, addr6);
1256 /* nm_m may still be intact */
1258 if (error && (msg->connect.nm_flags & PRUC_FALLBACK)) {
1260 /* msg invalid now */
1262 if (msg->connect.nm_m) {
1263 m_freem(msg->connect.nm_m);
1264 msg->connect.nm_m = NULL;
1266 if (msg->connect.nm_flags & PRUC_NAMALLOC) {
1267 kfree(msg->connect.nm_nam, M_LWKTMSG);
1268 msg->connect.nm_nam = NULL;
1270 lwkt_replymsg(&msg->connect.base.lmsg, error);
1271 /* msg invalid now */
1276 tcp6_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf **mp,
1277 struct sockaddr_in6 *sin6, struct in6_addr *addr6)
1279 struct mbuf *m = *mp;
1280 struct inpcb *inp = tp->t_inpcb;
1281 struct socket *so = inp->inp_socket;
1285 * Cannot simply call in_pcbconnect, because there might be an
1286 * earlier incarnation of this same connection still in
1287 * TIME_WAIT state, creating an ADDRINUSE error.
1289 oinp = in6_pcblookup_hash(inp->inp_cpcbinfo,
1290 &sin6->sin6_addr, sin6->sin6_port,
1291 (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) ?
1292 addr6 : &inp->in6p_laddr),
1293 inp->inp_lport, 0, NULL);
1295 return (EADDRINUSE);
1297 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
1298 inp->in6p_laddr = *addr6;
1299 inp->in6p_faddr = sin6->sin6_addr;
1300 inp->inp_fport = sin6->sin6_port;
1301 if ((sin6->sin6_flowinfo & IPV6_FLOWINFO_MASK) != 0)
1302 inp->in6p_flowinfo = sin6->sin6_flowinfo;
1303 in_pcbinsconnhash(inp);
1306 * Now that no more errors can occur, change the protocol processing
1307 * port to the current thread (which is the correct thread).
1309 * Create TCP timer message now; we are on the tcpcb's owner
1312 tcp_create_timermsg(tp, &curthread->td_msgport);
1314 /* Compute window scaling to request. */
1315 if (tp->request_r_scale < TCP_MIN_WINSHIFT)
1316 tp->request_r_scale = TCP_MIN_WINSHIFT;
1317 while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1318 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat) {
1319 tp->request_r_scale++;
1323 tcpstat.tcps_connattempt++;
1324 tp->t_state = TCPS_SYN_SENT;
1325 tcp_callout_reset(tp, tp->tt_keep, tp->t_keepinit, tcp_timer_keep);
1326 tp->iss = tcp_new_isn(tp);
1327 tcp_sendseqinit(tp);
1329 ssb_appendstream(&so->so_snd, m);
1331 if (flags & PRUS_OOB)
1332 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc;
1336 * Close the send side of the connection after
1337 * the data is sent if flagged.
1339 if ((flags & (PRUS_OOB|PRUS_EOF)) == PRUS_EOF) {
1341 tp = tcp_usrclosed(tp);
1343 return (tcp_output(tp));
1349 * The new sockopt interface makes it possible for us to block in the
1350 * copyin/out step (if we take a page fault). Taking a page fault while
1351 * in a critical section is probably a Bad Thing. (Since sockets and pcbs
1352 * both now use TSM, there probably isn't any need for this function to
1353 * run in a critical section any more. This needs more examination.)
1356 tcp_ctloutput(netmsg_t msg)
1358 struct socket *so = msg->base.nm_so;
1359 struct sockopt *sopt = msg->ctloutput.nm_sopt;
1360 int error, opt, optval, opthz;
1371 if (sopt->sopt_level != IPPROTO_TCP) {
1373 if (INP_CHECK_SOCKAF(so, AF_INET6))
1374 ip6_ctloutput_dispatch(msg);
1378 /* msg invalid now */
1381 tp = intotcpcb(inp);
1383 switch (sopt->sopt_dir) {
1385 error = soopt_to_kbuf(sopt, &optval, sizeof optval,
1389 switch (sopt->sopt_name) {
1392 tp->t_keepidle = tp->t_keepintvl;
1394 tp->t_keepidle = tcp_keepidle;
1395 tcp_timer_keep_activity(tp, 0);
1397 #ifdef TCP_SIGNATURE
1398 case TCP_SIGNATURE_ENABLE:
1399 if (tp->t_state == TCPS_CLOSED) {
1401 * This is the only safe state that this
1402 * option could be changed. Some segments
1403 * could already have been sent in other
1407 tp->t_flags |= TF_SIGNATURE;
1409 tp->t_flags &= ~TF_SIGNATURE;
1414 #endif /* TCP_SIGNATURE */
1417 switch (sopt->sopt_name) {
1425 opt = 0; /* dead code to fool gcc */
1432 tp->t_flags &= ~opt;
1436 if (tcp_disable_nopush)
1439 tp->t_flags |= TF_NOPUSH;
1441 tp->t_flags &= ~TF_NOPUSH;
1442 error = tcp_output(tp);
1448 * Must be between 0 and maxseg. If the requested
1449 * maxseg is too small to satisfy the desired minmss,
1450 * pump it up (silently so sysctl modifications of
1451 * minmss do not create unexpected program failures).
1452 * Handle degenerate cases.
1454 if (optval > 0 && optval <= tp->t_maxseg) {
1455 if (optval + 40 < tcp_minmss) {
1456 optval = tcp_minmss - 40;
1460 tp->t_maxseg = optval;
1467 opthz = ((int64_t)optval * hz) / 1000;
1469 tp->t_keepinit = opthz;
1475 opthz = ((int64_t)optval * hz) / 1000;
1477 tp->t_keepidle = opthz;
1478 tcp_timer_keep_activity(tp, 0);
1485 opthz = ((int64_t)optval * hz) / 1000;
1487 tp->t_keepintvl = opthz;
1488 tp->t_maxidle = tp->t_keepintvl * tp->t_keepcnt;
1496 tp->t_keepcnt = optval;
1497 tp->t_maxidle = tp->t_keepintvl * tp->t_keepcnt;
1504 error = ENOPROTOOPT;
1510 switch (sopt->sopt_name) {
1511 #ifdef TCP_SIGNATURE
1512 case TCP_SIGNATURE_ENABLE:
1513 optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0;
1515 #endif /* TCP_SIGNATURE */
1517 optval = tp->t_flags & TF_NODELAY;
1520 optval = tp->t_maxseg;
1523 optval = tp->t_flags & TF_NOOPT;
1526 optval = tp->t_flags & TF_NOPUSH;
1529 optval = ((int64_t)tp->t_keepinit * 1000) / hz;
1532 optval = ((int64_t)tp->t_keepidle * 1000) / hz;
1535 optval = ((int64_t)tp->t_keepintvl * 1000) / hz;
1538 optval = tp->t_keepcnt;
1541 error = ENOPROTOOPT;
1545 soopt_from_kbuf(sopt, &optval, sizeof optval);
1549 lwkt_replymsg(&msg->lmsg, error);
1553 * tcp_sendspace and tcp_recvspace are the default send and receive window
1554 * sizes, respectively. These are obsolescent (this information should
1555 * be set by the route).
1557 * Use a default that does not require tcp window scaling to be turned
1558 * on. Individual programs or the administrator can increase the default.
1560 u_long tcp_sendspace = 57344; /* largest multiple of PAGE_SIZE < 64k */
1561 SYSCTL_INT(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW,
1562 &tcp_sendspace , 0, "Maximum outgoing TCP datagram size");
1563 u_long tcp_recvspace = 57344; /* largest multiple of PAGE_SIZE < 64k */
1564 SYSCTL_INT(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
1565 &tcp_recvspace , 0, "Maximum incoming TCP datagram size");
1568 * Attach TCP protocol to socket, allocating internet protocol control
1569 * block, tcp control block, buffer space, and entering CLOSED state.
1572 tcp_attach(struct socket *so, struct pru_attach_info *ai)
1579 int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6) != 0;
1582 if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) {
1583 lwkt_gettoken(&so->so_rcv.ssb_token);
1584 error = soreserve(so, tcp_sendspace, tcp_recvspace,
1586 lwkt_reltoken(&so->so_rcv.ssb_token);
1590 atomic_set_int(&so->so_rcv.ssb_flags, SSB_AUTOSIZE);
1591 atomic_set_int(&so->so_snd.ssb_flags, SSB_AUTOSIZE);
1592 cpu = mycpu->gd_cpuid;
1595 * Set the default port for protocol processing. This will likely
1596 * change when we connect.
1598 error = in_pcballoc(so, &tcbinfo[cpu]);
1604 inp->inp_vflag |= INP_IPV6;
1605 inp->in6p_hops = -1; /* use kernel default */
1609 inp->inp_vflag |= INP_IPV4;
1610 tp = tcp_newtcpcb(inp);
1613 * Make sure the socket is destroyed by the pcbdetach.
1622 sofree(so); /* from ref above */
1625 tp->t_state = TCPS_CLOSED;
1626 /* Keep a reference for asynchronized pru_rcvd */
1632 * Initiate (or continue) disconnect.
1633 * If embryonic state, just send reset (once).
1634 * If in ``let data drain'' option and linger null, just drop.
1635 * Otherwise (hard), mark socket disconnecting and drop
1636 * current input data; switch states based on user close, and
1637 * send segment to peer (with FIN).
1639 static struct tcpcb *
1640 tcp_disconnect(struct tcpcb *tp)
1642 struct socket *so = tp->t_inpcb->inp_socket;
1644 if (tp->t_state < TCPS_ESTABLISHED) {
1646 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
1647 tp = tcp_drop(tp, 0);
1649 lwkt_gettoken(&so->so_rcv.ssb_token);
1650 soisdisconnecting(so);
1651 sbflush(&so->so_rcv.sb);
1652 tp = tcp_usrclosed(tp);
1655 lwkt_reltoken(&so->so_rcv.ssb_token);
1661 * User issued close, and wish to trail through shutdown states:
1662 * if never received SYN, just forget it. If got a SYN from peer,
1663 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
1664 * If already got a FIN from peer, then almost done; go to LAST_ACK
1665 * state. In all other cases, have already sent FIN to peer (e.g.
1666 * after PRU_SHUTDOWN), and just have to play tedious game waiting
1667 * for peer to send FIN or not respond to keep-alives, etc.
1668 * We can let the user exit from the close as soon as the FIN is acked.
1670 static struct tcpcb *
1671 tcp_usrclosed(struct tcpcb *tp)
1674 switch (tp->t_state) {
1678 tp->t_state = TCPS_CLOSED;
1683 case TCPS_SYN_RECEIVED:
1684 tp->t_flags |= TF_NEEDFIN;
1687 case TCPS_ESTABLISHED:
1688 tp->t_state = TCPS_FIN_WAIT_1;
1691 case TCPS_CLOSE_WAIT:
1692 tp->t_state = TCPS_LAST_ACK;
1695 if (tp && tp->t_state >= TCPS_FIN_WAIT_2) {
1696 soisdisconnected(tp->t_inpcb->inp_socket);
1697 /* To prevent the connection hanging in FIN_WAIT_2 forever. */
1698 if (tp->t_state == TCPS_FIN_WAIT_2) {
1699 tcp_callout_reset(tp, tp->tt_2msl, tp->t_maxidle,