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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9 * modification, are permitted provided that the following conditions
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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 * Allocate socket buffer space.
178 tcp_usr_preattach(struct socket
*so
, int proto __unused
,
179 struct pru_attach_info
*ai
)
183 if (so
->so_snd
.ssb_hiwat
== 0 || so
->so_rcv
.ssb_hiwat
== 0) {
184 error
= soreserve(so
, tcp_sendspace
, tcp_recvspace
,
189 atomic_set_int(&so
->so_rcv
.ssb_flags
, SSB_AUTOSIZE
| SSB_PREALLOC
);
190 atomic_set_int(&so
->so_snd
.ssb_flags
, SSB_AUTOSIZE
| SSB_PREALLOC
);
196 * TCP attaches to socket via pru_attach(), reserving space,
197 * and an internet control block. This socket may move to
198 * other CPU later when we bind/connect.
201 tcp_usr_attach(netmsg_t msg
)
203 struct socket
*so
= msg
->base
.nm_so
;
204 struct pru_attach_info
*ai
= msg
->attach
.nm_ai
;
207 struct tcpcb
*tp
= NULL
;
211 KASSERT(inp
== NULL
, ("tcp socket attached"));
214 error
= tcp_attach(so
, ai
);
218 if ((so
->so_options
& SO_LINGER
) && so
->so_linger
== 0)
219 so
->so_linger
= TCP_LINGERTIME
;
222 TCPDEBUG2(PRU_ATTACH
);
223 lwkt_replymsg(&msg
->lmsg
, error
);
227 * pru_detach() detaches the TCP protocol from the socket.
228 * If the protocol state is non-embryonic, then can't
229 * do this directly: have to initiate a pru_disconnect(),
230 * which may finish later; embryonic TCB's can just
234 tcp_usr_detach(netmsg_t msg
)
236 struct socket
*so
= msg
->base
.nm_so
;
245 * If the inp is already detached or never attached, it may have
246 * been due to an async close or async attach failure. Just return
247 * as if no error occured.
251 KASSERT(tp
!= NULL
, ("tcp_usr_detach: tp is NULL"));
253 tp
= tcp_disconnect(tp
);
254 TCPDEBUG2(PRU_DETACH
);
256 lwkt_replymsg(&msg
->lmsg
, error
);
260 * NOTE: ignore_error is non-zero for certain disconnection races
261 * which we want to silently allow, otherwise close() may return
262 * an unexpected error.
264 * NOTE: The variables (msg) and (tp) are assumed.
266 #define COMMON_START(so, inp, ignore_error) \
272 error = ignore_error ? 0 : EINVAL; \
276 tp = intotcpcb(inp); \
280 #define COMMON_END1(req, noreply) \
284 lwkt_replymsg(&msg->lmsg, error); \
288 #define COMMON_END(req) COMMON_END1((req), 0)
291 * Give the socket an address.
294 tcp_usr_bind(netmsg_t msg
)
296 struct socket
*so
= msg
->bind
.base
.nm_so
;
297 struct sockaddr
*nam
= msg
->bind
.nm_nam
;
298 struct thread
*td
= msg
->bind
.nm_td
;
302 struct sockaddr_in
*sinp
;
304 COMMON_START(so
, inp
, 0);
307 * Must check for multicast addresses and disallow binding
310 sinp
= (struct sockaddr_in
*)nam
;
311 if (sinp
->sin_family
== AF_INET
&&
312 IN_MULTICAST(ntohl(sinp
->sin_addr
.s_addr
))) {
313 error
= EAFNOSUPPORT
;
316 error
= in_pcbbind(inp
, nam
, td
);
320 COMMON_END(PRU_BIND
);
326 tcp6_usr_bind(netmsg_t msg
)
328 struct socket
*so
= msg
->bind
.base
.nm_so
;
329 struct sockaddr
*nam
= msg
->bind
.nm_nam
;
330 struct thread
*td
= msg
->bind
.nm_td
;
334 struct sockaddr_in6
*sin6p
;
336 COMMON_START(so
, inp
, 0);
339 * Must check for multicast addresses and disallow binding
342 sin6p
= (struct sockaddr_in6
*)nam
;
343 if (sin6p
->sin6_family
== AF_INET6
&&
344 IN6_IS_ADDR_MULTICAST(&sin6p
->sin6_addr
)) {
345 error
= EAFNOSUPPORT
;
348 error
= in6_pcbbind(inp
, nam
, td
);
351 COMMON_END(PRU_BIND
);
355 struct netmsg_inswildcard
{
356 struct netmsg_base base
;
357 struct inpcb
*nm_inp
;
361 in_pcbinswildcardhash_handler(netmsg_t msg
)
363 struct netmsg_inswildcard
*nm
= (struct netmsg_inswildcard
*)msg
;
364 int cpu
= mycpuid
, nextcpu
;
366 in_pcbinswildcardhash_oncpu(nm
->nm_inp
, &tcbinfo
[cpu
]);
369 if (nextcpu
< ncpus2
)
370 lwkt_forwardmsg(netisr_cpuport(nextcpu
), &nm
->base
.lmsg
);
372 lwkt_replymsg(&nm
->base
.lmsg
, 0);
376 tcp_sosetport(struct lwkt_msg
*msg
, lwkt_port_t port
)
378 sosetport(((struct netmsg_base
*)msg
)->nm_so
, port
);
382 * Prepare to accept connections.
385 tcp_usr_listen(netmsg_t msg
)
387 struct socket
*so
= msg
->listen
.base
.nm_so
;
388 struct thread
*td
= msg
->listen
.nm_td
;
392 struct netmsg_inswildcard nm
;
393 lwkt_port_t port0
= netisr_cpuport(0);
395 COMMON_START(so
, inp
, 0);
397 if (&curthread
->td_msgport
!= port0
) {
398 lwkt_msg_t lmsg
= &msg
->listen
.base
.lmsg
;
400 KASSERT((msg
->listen
.nm_flags
& PRUL_RELINK
) == 0,
401 ("already asked to relink"));
403 in_pcbunlink(so
->so_pcb
, &tcbinfo
[mycpuid
]);
404 msg
->listen
.nm_flags
|= PRUL_RELINK
;
406 /* See the related comment in tcp_connect() */
407 lwkt_setmsg_receipt(lmsg
, tcp_sosetport
);
408 lwkt_forwardmsg(port0
, lmsg
);
409 /* msg invalid now */
412 KASSERT(so
->so_port
== port0
, ("so_port is not netisr0"));
414 if (msg
->listen
.nm_flags
& PRUL_RELINK
) {
415 msg
->listen
.nm_flags
&= ~PRUL_RELINK
;
416 in_pcblink(so
->so_pcb
, &tcbinfo
[mycpuid
]);
418 KASSERT(inp
->inp_pcbinfo
== &tcbinfo
[0], ("pcbinfo is not tcbinfo0"));
420 if (tp
->t_flags
& TF_LISTEN
)
423 if (inp
->inp_lport
== 0) {
424 error
= in_pcbbind(inp
, NULL
, td
);
429 tp
->t_state
= TCPS_LISTEN
;
430 tp
->t_flags
|= TF_LISTEN
;
431 tp
->tt_msg
= NULL
; /* Catch any invalid timer usage */
435 * Put this inpcb into wildcard hash on other cpus.
437 ASSERT_INP_NOTINHASH(inp
);
438 netmsg_init(&nm
.base
, NULL
, &curthread
->td_msgport
,
439 MSGF_PRIORITY
, in_pcbinswildcardhash_handler
);
441 lwkt_domsg(netisr_cpuport(1), &nm
.base
.lmsg
, 0);
443 in_pcbinswildcardhash(inp
);
444 COMMON_END(PRU_LISTEN
);
450 tcp6_usr_listen(netmsg_t msg
)
452 struct socket
*so
= msg
->listen
.base
.nm_so
;
453 struct thread
*td
= msg
->listen
.nm_td
;
457 struct netmsg_inswildcard nm
;
459 COMMON_START(so
, inp
, 0);
461 if (tp
->t_flags
& TF_LISTEN
)
464 if (inp
->inp_lport
== 0) {
465 error
= in6_pcbbind(inp
, NULL
, td
);
470 tp
->t_state
= TCPS_LISTEN
;
471 tp
->t_flags
|= TF_LISTEN
;
472 tp
->tt_msg
= NULL
; /* Catch any invalid timer usage */
476 * Put this inpcb into wildcard hash on other cpus.
478 KKASSERT(so
->so_port
== netisr_cpuport(0));
480 KKASSERT(inp
->inp_pcbinfo
== &tcbinfo
[0]);
481 ASSERT_INP_NOTINHASH(inp
);
483 netmsg_init(&nm
.base
, NULL
, &curthread
->td_msgport
,
484 MSGF_PRIORITY
, in_pcbinswildcardhash_handler
);
486 lwkt_domsg(netisr_cpuport(1), &nm
.base
.lmsg
, 0);
488 in_pcbinswildcardhash(inp
);
489 COMMON_END(PRU_LISTEN
);
494 * Initiate connection to peer.
495 * Create a template for use in transmissions on this connection.
496 * Enter SYN_SENT state, and mark socket as connecting.
497 * Start keep-alive timer, and seed output sequence space.
498 * Send initial segment on connection.
501 tcp_usr_connect(netmsg_t msg
)
503 struct socket
*so
= msg
->connect
.base
.nm_so
;
504 struct sockaddr
*nam
= msg
->connect
.nm_nam
;
505 struct thread
*td
= msg
->connect
.nm_td
;
509 struct sockaddr_in
*sinp
;
511 COMMON_START(so
, inp
, 0);
514 * Must disallow TCP ``connections'' to multicast addresses.
516 sinp
= (struct sockaddr_in
*)nam
;
517 if (sinp
->sin_family
== AF_INET
518 && IN_MULTICAST(ntohl(sinp
->sin_addr
.s_addr
))) {
519 error
= EAFNOSUPPORT
;
523 if (!prison_remote_ip(td
, (struct sockaddr
*)sinp
)) {
524 error
= EAFNOSUPPORT
; /* IPv6 only jail */
529 /* msg is invalid now */
532 if (msg
->connect
.nm_m
) {
533 m_freem(msg
->connect
.nm_m
);
534 msg
->connect
.nm_m
= NULL
;
536 if (msg
->connect
.nm_flags
& PRUC_HELDTD
)
538 if (error
&& (msg
->connect
.nm_flags
& PRUC_ASYNC
)) {
539 so
->so_error
= error
;
540 soisdisconnected(so
);
542 lwkt_replymsg(&msg
->lmsg
, error
);
548 tcp6_usr_connect(netmsg_t msg
)
550 struct socket
*so
= msg
->connect
.base
.nm_so
;
551 struct sockaddr
*nam
= msg
->connect
.nm_nam
;
552 struct thread
*td
= msg
->connect
.nm_td
;
556 struct sockaddr_in6
*sin6p
;
558 COMMON_START(so
, inp
, 0);
561 * Must disallow TCP ``connections'' to multicast addresses.
563 sin6p
= (struct sockaddr_in6
*)nam
;
564 if (sin6p
->sin6_family
== AF_INET6
565 && IN6_IS_ADDR_MULTICAST(&sin6p
->sin6_addr
)) {
566 error
= EAFNOSUPPORT
;
570 if (!prison_remote_ip(td
, nam
)) {
571 error
= EAFNOSUPPORT
; /* IPv4 only jail */
575 /* Reject v4-mapped address */
576 if (IN6_IS_ADDR_V4MAPPED(&sin6p
->sin6_addr
)) {
577 error
= EADDRNOTAVAIL
;
581 inp
->inp_inc
.inc_isipv6
= 1;
583 /* msg is invalid now */
586 if (msg
->connect
.nm_m
) {
587 m_freem(msg
->connect
.nm_m
);
588 msg
->connect
.nm_m
= NULL
;
590 lwkt_replymsg(&msg
->lmsg
, error
);
596 * Initiate disconnect from peer.
597 * If connection never passed embryonic stage, just drop;
598 * else if don't need to let data drain, then can just drop anyways,
599 * else have to begin TCP shutdown process: mark socket disconnecting,
600 * drain unread data, state switch to reflect user close, and
601 * send segment (e.g. FIN) to peer. Socket will be really disconnected
602 * when peer sends FIN and acks ours.
604 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
607 tcp_usr_disconnect(netmsg_t msg
)
609 struct socket
*so
= msg
->disconnect
.base
.nm_so
;
614 COMMON_START(so
, inp
, 1);
615 tp
= tcp_disconnect(tp
);
616 COMMON_END(PRU_DISCONNECT
);
620 * Accept a connection. Essentially all the work is
621 * done at higher levels; just return the address
622 * of the peer, storing through addr.
625 tcp_usr_accept(netmsg_t msg
)
627 struct socket
*so
= msg
->accept
.base
.nm_so
;
628 struct sockaddr
**nam
= msg
->accept
.nm_nam
;
631 struct tcpcb
*tp
= NULL
;
635 if (so
->so_state
& SS_ISDISCONNECTED
) {
636 error
= ECONNABORTED
;
646 in_setpeeraddr(so
, nam
);
647 COMMON_END(PRU_ACCEPT
);
652 tcp6_usr_accept(netmsg_t msg
)
654 struct socket
*so
= msg
->accept
.base
.nm_so
;
655 struct sockaddr
**nam
= msg
->accept
.nm_nam
;
658 struct tcpcb
*tp
= NULL
;
663 if (so
->so_state
& SS_ISDISCONNECTED
) {
664 error
= ECONNABORTED
;
673 in6_setpeeraddr(so
, nam
);
674 COMMON_END(PRU_ACCEPT
);
679 * Mark the connection as being incapable of further output.
682 tcp_usr_shutdown(netmsg_t msg
)
684 struct socket
*so
= msg
->shutdown
.base
.nm_so
;
689 COMMON_START(so
, inp
, 0);
691 tp
= tcp_usrclosed(tp
);
693 error
= tcp_output(tp
);
694 COMMON_END(PRU_SHUTDOWN
);
698 * After a receive, possibly send window update to peer.
701 tcp_usr_rcvd(netmsg_t msg
)
703 struct socket
*so
= msg
->rcvd
.base
.nm_so
;
704 int error
= 0, noreply
= 0;
708 COMMON_START(so
, inp
, 0);
710 if (msg
->rcvd
.nm_pru_flags
& PRUR_ASYNC
) {
712 so_async_rcvd_reply(so
);
716 COMMON_END1(PRU_RCVD
, noreply
);
720 * Do a send by putting data in output queue and updating urgent
721 * marker if URG set. Possibly send more data. Unlike the other
722 * pru_*() routines, the mbuf chains are our responsibility. We
723 * must either enqueue them or free them. The other pru_* routines
724 * generally are caller-frees.
727 tcp_usr_send(netmsg_t msg
)
729 struct socket
*so
= msg
->send
.base
.nm_so
;
730 int flags
= msg
->send
.nm_flags
;
731 struct mbuf
*m
= msg
->send
.nm_m
;
737 KKASSERT(msg
->send
.nm_control
== NULL
);
738 KKASSERT(msg
->send
.nm_addr
== NULL
);
739 KKASSERT((flags
& PRUS_FREEADDR
) == 0);
745 * OOPS! we lost a race, the TCP session got reset after
746 * we checked SS_CANTSENDMORE, eg: while doing uiomove or a
747 * network interrupt in the non-critical section of sosend().
750 error
= ECONNRESET
; /* XXX EPIPE? */
760 * This is no longer necessary, since:
761 * - sosendtcp() has already checked it for us
762 * - It does not work with asynchronized send
766 * Don't let too much OOB data build up
768 if (flags
& PRUS_OOB
) {
769 if (ssb_space(&so
->so_snd
) < -512) {
778 * Pump the data into the socket.
781 ssb_appendstream(&so
->so_snd
, m
);
784 if (flags
& PRUS_OOB
) {
786 * According to RFC961 (Assigned Protocols),
787 * the urgent pointer points to the last octet
788 * of urgent data. We continue, however,
789 * to consider it to indicate the first octet
790 * of data past the urgent section.
791 * Otherwise, snd_up should be one lower.
793 tp
->snd_up
= tp
->snd_una
+ so
->so_snd
.ssb_cc
;
794 tp
->t_flags
|= TF_FORCE
;
795 error
= tcp_output(tp
);
796 tp
->t_flags
&= ~TF_FORCE
;
798 if (flags
& PRUS_EOF
) {
800 * Close the send side of the connection after
804 tp
= tcp_usrclosed(tp
);
806 if (tp
!= NULL
&& !tcp_output_pending(tp
)) {
807 if (flags
& PRUS_MORETOCOME
)
808 tp
->t_flags
|= TF_MORETOCOME
;
809 error
= tcp_output_fair(tp
);
810 if (flags
& PRUS_MORETOCOME
)
811 tp
->t_flags
&= ~TF_MORETOCOME
;
814 COMMON_END1((flags
& PRUS_OOB
) ? PRU_SENDOOB
:
815 ((flags
& PRUS_EOF
) ? PRU_SEND_EOF
: PRU_SEND
),
816 (flags
& PRUS_NOREPLY
));
820 * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort()
821 * will sofree() it when we return.
824 tcp_usr_abort(netmsg_t msg
)
826 struct socket
*so
= msg
->abort
.base
.nm_so
;
831 COMMON_START(so
, inp
, 1);
832 tp
= tcp_drop(tp
, ECONNABORTED
);
833 COMMON_END(PRU_ABORT
);
837 * Receive out-of-band data.
840 tcp_usr_rcvoob(netmsg_t msg
)
842 struct socket
*so
= msg
->rcvoob
.base
.nm_so
;
843 struct mbuf
*m
= msg
->rcvoob
.nm_m
;
844 int flags
= msg
->rcvoob
.nm_flags
;
849 COMMON_START(so
, inp
, 0);
850 if ((so
->so_oobmark
== 0 &&
851 (so
->so_state
& SS_RCVATMARK
) == 0) ||
852 so
->so_options
& SO_OOBINLINE
||
853 tp
->t_oobflags
& TCPOOB_HADDATA
) {
857 if ((tp
->t_oobflags
& TCPOOB_HAVEDATA
) == 0) {
862 *mtod(m
, caddr_t
) = tp
->t_iobc
;
863 if ((flags
& MSG_PEEK
) == 0)
864 tp
->t_oobflags
^= (TCPOOB_HAVEDATA
| TCPOOB_HADDATA
);
865 COMMON_END(PRU_RCVOOB
);
869 tcp_usr_savefaddr(struct socket
*so
, const struct sockaddr
*faddr
)
871 in_savefaddr(so
, faddr
);
876 tcp6_usr_savefaddr(struct socket
*so
, const struct sockaddr
*faddr
)
878 in6_savefaddr(so
, faddr
);
883 tcp_usr_preconnect(struct socket
*so
, const struct sockaddr
*nam
,
884 struct thread
*td __unused
)
886 const struct sockaddr_in
*sinp
;
888 sinp
= (const struct sockaddr_in
*)nam
;
889 if (sinp
->sin_family
== AF_INET
&&
890 IN_MULTICAST(ntohl(sinp
->sin_addr
.s_addr
)))
897 /* xxx - should be const */
898 struct pr_usrreqs tcp_usrreqs
= {
899 .pru_abort
= tcp_usr_abort
,
900 .pru_accept
= tcp_usr_accept
,
901 .pru_attach
= tcp_usr_attach
,
902 .pru_bind
= tcp_usr_bind
,
903 .pru_connect
= tcp_usr_connect
,
904 .pru_connect2
= pr_generic_notsupp
,
905 .pru_control
= in_control_dispatch
,
906 .pru_detach
= tcp_usr_detach
,
907 .pru_disconnect
= tcp_usr_disconnect
,
908 .pru_listen
= tcp_usr_listen
,
909 .pru_peeraddr
= in_setpeeraddr_dispatch
,
910 .pru_rcvd
= tcp_usr_rcvd
,
911 .pru_rcvoob
= tcp_usr_rcvoob
,
912 .pru_send
= tcp_usr_send
,
913 .pru_sense
= pru_sense_null
,
914 .pru_shutdown
= tcp_usr_shutdown
,
915 .pru_sockaddr
= in_setsockaddr_dispatch
,
916 .pru_sosend
= sosendtcp
,
917 .pru_soreceive
= sorecvtcp
,
918 .pru_savefaddr
= tcp_usr_savefaddr
,
919 .pru_preconnect
= tcp_usr_preconnect
,
920 .pru_preattach
= tcp_usr_preattach
924 struct pr_usrreqs tcp6_usrreqs
= {
925 .pru_abort
= tcp_usr_abort
,
926 .pru_accept
= tcp6_usr_accept
,
927 .pru_attach
= tcp_usr_attach
,
928 .pru_bind
= tcp6_usr_bind
,
929 .pru_connect
= tcp6_usr_connect
,
930 .pru_connect2
= pr_generic_notsupp
,
931 .pru_control
= in6_control_dispatch
,
932 .pru_detach
= tcp_usr_detach
,
933 .pru_disconnect
= tcp_usr_disconnect
,
934 .pru_listen
= tcp6_usr_listen
,
935 .pru_peeraddr
= in6_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
= in6_setsockaddr_dispatch
,
942 .pru_sosend
= sosendtcp
,
943 .pru_soreceive
= sorecvtcp
,
944 .pru_savefaddr
= tcp6_usr_savefaddr
949 tcp_connect_oncpu(struct tcpcb
*tp
, int flags
, struct mbuf
*m
,
950 struct sockaddr_in
*sin
, struct sockaddr_in
*if_sin
)
952 struct inpcb
*inp
= tp
->t_inpcb
, *oinp
;
953 struct socket
*so
= inp
->inp_socket
;
954 struct route
*ro
= &inp
->inp_route
;
956 KASSERT(inp
->inp_pcbinfo
== &tcbinfo
[mycpu
->gd_cpuid
],
957 ("pcbinfo mismatch"));
959 oinp
= in_pcblookup_hash(inp
->inp_pcbinfo
,
960 sin
->sin_addr
, sin
->sin_port
,
961 (inp
->inp_laddr
.s_addr
!= INADDR_ANY
?
962 inp
->inp_laddr
: if_sin
->sin_addr
),
963 inp
->inp_lport
, 0, NULL
);
968 if (inp
->inp_laddr
.s_addr
== INADDR_ANY
)
969 inp
->inp_laddr
= if_sin
->sin_addr
;
970 inp
->inp_faddr
= sin
->sin_addr
;
971 inp
->inp_fport
= sin
->sin_port
;
972 in_pcbinsconnhash(inp
);
975 * We are now on the inpcb's owner CPU, if the cached route was
976 * freed because the rtentry's owner CPU is not the current CPU
977 * (e.g. in tcp_connect()), then we try to reallocate it here with
978 * the hope that a rtentry may be cloned from a RTF_PRCLONING
981 if (!(inp
->inp_socket
->so_options
& SO_DONTROUTE
) && /*XXX*/
983 bzero(&ro
->ro_dst
, sizeof(struct sockaddr_in
));
984 ro
->ro_dst
.sa_family
= AF_INET
;
985 ro
->ro_dst
.sa_len
= sizeof(struct sockaddr_in
);
986 ((struct sockaddr_in
*)&ro
->ro_dst
)->sin_addr
=
992 * Now that no more errors can occur, change the protocol processing
993 * port to the current thread (which is the correct thread).
995 * Create TCP timer message now; we are on the tcpcb's owner
998 tcp_create_timermsg(tp
, &curthread
->td_msgport
);
1001 * Compute window scaling to request. Use a larger scaling then
1002 * needed for the initial receive buffer in case the receive buffer
1005 if (tp
->request_r_scale
< TCP_MIN_WINSHIFT
)
1006 tp
->request_r_scale
= TCP_MIN_WINSHIFT
;
1007 while (tp
->request_r_scale
< TCP_MAX_WINSHIFT
&&
1008 (TCP_MAXWIN
<< tp
->request_r_scale
) < so
->so_rcv
.ssb_hiwat
1010 tp
->request_r_scale
++;
1014 tcpstat
.tcps_connattempt
++;
1015 tp
->t_state
= TCPS_SYN_SENT
;
1016 tcp_callout_reset(tp
, tp
->tt_keep
, tp
->t_keepinit
, tcp_timer_keep
);
1017 tp
->iss
= tcp_new_isn(tp
);
1018 tcp_sendseqinit(tp
);
1020 ssb_appendstream(&so
->so_snd
, m
);
1022 if (flags
& PRUS_OOB
)
1023 tp
->snd_up
= tp
->snd_una
+ so
->so_snd
.ssb_cc
;
1027 * Close the send side of the connection after
1028 * the data is sent if flagged.
1030 if ((flags
& (PRUS_OOB
|PRUS_EOF
)) == PRUS_EOF
) {
1032 tp
= tcp_usrclosed(tp
);
1034 return (tcp_output(tp
));
1038 * Common subroutine to open a TCP connection to remote host specified
1039 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local
1040 * port number if needed. Call in_pcbladdr to do the routing and to choose
1041 * a local host address (interface).
1042 * Initialize connection parameters and enter SYN-SENT state.
1045 tcp_connect(netmsg_t msg
)
1047 struct socket
*so
= msg
->connect
.base
.nm_so
;
1048 struct sockaddr
*nam
= msg
->connect
.nm_nam
;
1049 struct thread
*td
= msg
->connect
.nm_td
;
1050 struct sockaddr_in
*sin
= (struct sockaddr_in
*)nam
;
1051 struct sockaddr_in
*if_sin
= NULL
;
1057 COMMON_START(so
, inp
, 0);
1060 * Reconnect our pcb if we have to
1062 if (msg
->connect
.nm_flags
& PRUC_RECONNECT
) {
1063 msg
->connect
.nm_flags
&= ~PRUC_RECONNECT
;
1064 in_pcblink(so
->so_pcb
, &tcbinfo
[mycpu
->gd_cpuid
]);
1068 * Bind if we have to
1070 if (inp
->inp_lport
== 0) {
1071 if (tcp_lport_extension
) {
1072 KKASSERT(inp
->inp_laddr
.s_addr
== INADDR_ANY
);
1074 error
= in_pcbladdr(inp
, nam
, &if_sin
, td
);
1077 inp
->inp_laddr
.s_addr
= if_sin
->sin_addr
.s_addr
;
1079 error
= in_pcbbind_remote(inp
, nam
, td
);
1083 msg
->connect
.nm_flags
|= PRUC_HASLADDR
;
1085 error
= in_pcbbind(inp
, NULL
, td
);
1091 if ((msg
->connect
.nm_flags
& PRUC_HASLADDR
) == 0) {
1093 * Calculate the correct protocol processing thread. The
1094 * connect operation must run there. Set the forwarding
1095 * port before we forward the message or it will get bounced
1098 error
= in_pcbladdr(inp
, nam
, &if_sin
, td
);
1102 KKASSERT(inp
->inp_socket
== so
);
1104 port
= tcp_addrport(sin
->sin_addr
.s_addr
, sin
->sin_port
,
1105 (inp
->inp_laddr
.s_addr
!= INADDR_ANY
?
1106 inp
->inp_laddr
.s_addr
: if_sin
->sin_addr
.s_addr
),
1109 if (port
!= &curthread
->td_msgport
) {
1110 lwkt_msg_t lmsg
= &msg
->connect
.base
.lmsg
;
1113 * in_pcbladdr() may have allocated a route entry for us
1114 * on the current CPU, but we need a route entry on the
1115 * inpcb's owner CPU, so free it here.
1117 in_pcbresetroute(inp
);
1120 * We are moving the protocol processing port the socket
1121 * is on, we have to unlink here and re-link on the
1124 in_pcbunlink(so
->so_pcb
, &tcbinfo
[mycpu
->gd_cpuid
]);
1125 msg
->connect
.nm_flags
|= PRUC_RECONNECT
;
1126 msg
->connect
.base
.nm_dispatch
= tcp_connect
;
1129 * Use message put done receipt to change this socket's
1130 * so_port, i.e. _after_ this message was put onto the
1131 * target netisr's msgport but _before_ the message could
1132 * be pulled from the target netisr's msgport, so that:
1133 * - The upper half (socket code) will not see the new
1134 * msgport before this message reaches the new msgport
1135 * and messages for this socket will be ordered.
1136 * - This message will see the new msgport, when its
1137 * handler is called in the target netisr.
1140 * We MUST use messege put done receipt to change this
1142 * If we changed the so_port in this netisr after the
1143 * lwkt_forwardmsg (so messages for this socket will be
1144 * ordered) and changed the so_port in the target netisr
1145 * at the very beginning of this message's handler, we
1146 * would suffer so_port overwritten race, given this
1147 * message might be forwarded again.
1150 * This mechanism depends on that the netisr's msgport
1151 * is spin msgport (currently it is :).
1153 * If the upper half saw the new msgport before this
1154 * message reached the target netisr's msgport, the
1155 * messages sent from the upper half could reach the new
1156 * msgport before this message, thus there would be
1157 * message reordering. The worst case could be soclose()
1158 * saw the new msgport and the detach message could reach
1159 * the new msgport before this message, i.e. the inpcb
1160 * could have been destroyed when this message was still
1161 * pending on or on its way to the new msgport. Other
1162 * weird cases could also happen, e.g. inpcb->inp_pcbinfo,
1163 * since we have unlinked this inpcb from the current
1166 lwkt_setmsg_receipt(lmsg
, tcp_sosetport
);
1167 lwkt_forwardmsg(port
, lmsg
);
1168 /* msg invalid now */
1170 } else if (msg
->connect
.nm_flags
& PRUC_HELDTD
) {
1172 * The original thread is no longer needed; release it.
1175 msg
->connect
.nm_flags
&= ~PRUC_HELDTD
;
1177 error
= tcp_connect_oncpu(tp
, msg
->connect
.nm_sndflags
,
1178 msg
->connect
.nm_m
, sin
, if_sin
);
1179 msg
->connect
.nm_m
= NULL
;
1181 if (msg
->connect
.nm_m
) {
1182 m_freem(msg
->connect
.nm_m
);
1183 msg
->connect
.nm_m
= NULL
;
1185 if (msg
->connect
.nm_flags
& PRUC_HELDTD
)
1187 if (error
&& (msg
->connect
.nm_flags
& PRUC_ASYNC
)) {
1188 so
->so_error
= error
;
1189 soisdisconnected(so
);
1191 lwkt_replymsg(&msg
->connect
.base
.lmsg
, error
);
1192 /* msg invalid now */
1198 tcp6_connect(netmsg_t msg
)
1201 struct socket
*so
= msg
->connect
.base
.nm_so
;
1202 struct sockaddr
*nam
= msg
->connect
.nm_nam
;
1203 struct thread
*td
= msg
->connect
.nm_td
;
1205 struct sockaddr_in6
*sin6
= (struct sockaddr_in6
*)nam
;
1206 struct in6_addr
*addr6
;
1210 COMMON_START(so
, inp
, 0);
1213 * Reconnect our pcb if we have to
1215 if (msg
->connect
.nm_flags
& PRUC_RECONNECT
) {
1216 msg
->connect
.nm_flags
&= ~PRUC_RECONNECT
;
1217 in_pcblink(so
->so_pcb
, &tcbinfo
[mycpu
->gd_cpuid
]);
1221 * Bind if we have to
1223 if (inp
->inp_lport
== 0) {
1224 error
= in6_pcbbind(inp
, NULL
, td
);
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 error
= in6_pcbladdr(inp
, nam
, &addr6
, td
);
1238 port
= tcp6_addrport(); /* XXX hack for now, always cpu0 */
1240 if (port
!= &curthread
->td_msgport
) {
1241 lwkt_msg_t lmsg
= &msg
->connect
.base
.lmsg
;
1244 * in_pcbladdr() may have allocated a route entry for us
1245 * on the current CPU, but we need a route entry on the
1246 * inpcb's owner CPU, so free it here.
1248 in_pcbresetroute(inp
);
1250 in_pcbunlink(so
->so_pcb
, &tcbinfo
[mycpu
->gd_cpuid
]);
1251 msg
->connect
.nm_flags
|= PRUC_RECONNECT
;
1252 msg
->connect
.base
.nm_dispatch
= tcp6_connect
;
1254 /* See the related comment in tcp_connect() */
1255 lwkt_setmsg_receipt(lmsg
, tcp_sosetport
);
1256 lwkt_forwardmsg(port
, lmsg
);
1257 /* msg invalid now */
1260 error
= tcp6_connect_oncpu(tp
, msg
->connect
.nm_sndflags
,
1261 &msg
->connect
.nm_m
, sin6
, addr6
);
1262 /* nm_m may still be intact */
1264 if (msg
->connect
.nm_m
) {
1265 m_freem(msg
->connect
.nm_m
);
1266 msg
->connect
.nm_m
= NULL
;
1268 lwkt_replymsg(&msg
->connect
.base
.lmsg
, error
);
1269 /* msg invalid now */
1273 tcp6_connect_oncpu(struct tcpcb
*tp
, int flags
, struct mbuf
**mp
,
1274 struct sockaddr_in6
*sin6
, struct in6_addr
*addr6
)
1276 struct mbuf
*m
= *mp
;
1277 struct inpcb
*inp
= tp
->t_inpcb
;
1278 struct socket
*so
= inp
->inp_socket
;
1282 * Cannot simply call in_pcbconnect, because there might be an
1283 * earlier incarnation of this same connection still in
1284 * TIME_WAIT state, creating an ADDRINUSE error.
1286 oinp
= in6_pcblookup_hash(inp
->inp_pcbinfo
,
1287 &sin6
->sin6_addr
, sin6
->sin6_port
,
1288 (IN6_IS_ADDR_UNSPECIFIED(&inp
->in6p_laddr
) ?
1289 addr6
: &inp
->in6p_laddr
),
1290 inp
->inp_lport
, 0, NULL
);
1292 return (EADDRINUSE
);
1294 if (IN6_IS_ADDR_UNSPECIFIED(&inp
->in6p_laddr
))
1295 inp
->in6p_laddr
= *addr6
;
1296 inp
->in6p_faddr
= sin6
->sin6_addr
;
1297 inp
->inp_fport
= sin6
->sin6_port
;
1298 if ((sin6
->sin6_flowinfo
& IPV6_FLOWINFO_MASK
) != 0)
1299 inp
->in6p_flowinfo
= sin6
->sin6_flowinfo
;
1300 in_pcbinsconnhash(inp
);
1303 * Now that no more errors can occur, change the protocol processing
1304 * port to the current thread (which is the correct thread).
1306 * Create TCP timer message now; we are on the tcpcb's owner
1309 tcp_create_timermsg(tp
, &curthread
->td_msgport
);
1311 /* Compute window scaling to request. */
1312 if (tp
->request_r_scale
< TCP_MIN_WINSHIFT
)
1313 tp
->request_r_scale
= TCP_MIN_WINSHIFT
;
1314 while (tp
->request_r_scale
< TCP_MAX_WINSHIFT
&&
1315 (TCP_MAXWIN
<< tp
->request_r_scale
) < so
->so_rcv
.ssb_hiwat
) {
1316 tp
->request_r_scale
++;
1320 tcpstat
.tcps_connattempt
++;
1321 tp
->t_state
= TCPS_SYN_SENT
;
1322 tcp_callout_reset(tp
, tp
->tt_keep
, tp
->t_keepinit
, tcp_timer_keep
);
1323 tp
->iss
= tcp_new_isn(tp
);
1324 tcp_sendseqinit(tp
);
1326 ssb_appendstream(&so
->so_snd
, m
);
1328 if (flags
& PRUS_OOB
)
1329 tp
->snd_up
= tp
->snd_una
+ so
->so_snd
.ssb_cc
;
1333 * Close the send side of the connection after
1334 * the data is sent if flagged.
1336 if ((flags
& (PRUS_OOB
|PRUS_EOF
)) == PRUS_EOF
) {
1338 tp
= tcp_usrclosed(tp
);
1340 return (tcp_output(tp
));
1346 * The new sockopt interface makes it possible for us to block in the
1347 * copyin/out step (if we take a page fault). Taking a page fault while
1348 * in a critical section is probably a Bad Thing. (Since sockets and pcbs
1349 * both now use TSM, there probably isn't any need for this function to
1350 * run in a critical section any more. This needs more examination.)
1353 tcp_ctloutput(netmsg_t msg
)
1355 struct socket
*so
= msg
->base
.nm_so
;
1356 struct sockopt
*sopt
= msg
->ctloutput
.nm_sopt
;
1357 int error
, opt
, optval
, opthz
;
1367 tp
= intotcpcb(inp
);
1369 /* Get socket's owner cpuid hint */
1370 if (sopt
->sopt_level
== SOL_SOCKET
&&
1371 sopt
->sopt_dir
== SOPT_GET
&&
1372 sopt
->sopt_name
== SO_CPUHINT
) {
1373 if (tp
->t_flags
& TF_LISTEN
) {
1375 * Listen sockets owner cpuid is always 0,
1376 * which does not make sense if SO_REUSEPORT
1379 if (so
->so_options
& SO_REUSEPORT
)
1380 optval
= (inp
->inp_lgrpindex
& ncpus2_mask
);
1382 optval
= -1; /* no hint */
1386 soopt_from_kbuf(sopt
, &optval
, sizeof(optval
));
1390 if (sopt
->sopt_level
!= IPPROTO_TCP
) {
1391 if (sopt
->sopt_level
== IPPROTO_IP
) {
1392 switch (sopt
->sopt_name
) {
1393 case IP_MULTICAST_IF
:
1394 case IP_MULTICAST_VIF
:
1395 case IP_MULTICAST_TTL
:
1396 case IP_MULTICAST_LOOP
:
1397 case IP_ADD_MEMBERSHIP
:
1398 case IP_DROP_MEMBERSHIP
:
1400 * Multicast does not make sense on
1408 if (INP_CHECK_SOCKAF(so
, AF_INET6
))
1409 ip6_ctloutput_dispatch(msg
);
1413 /* msg invalid now */
1417 switch (sopt
->sopt_dir
) {
1419 error
= soopt_to_kbuf(sopt
, &optval
, sizeof optval
,
1423 switch (sopt
->sopt_name
) {
1426 tp
->t_keepidle
= tp
->t_keepintvl
;
1428 tp
->t_keepidle
= tcp_keepidle
;
1429 tcp_timer_keep_activity(tp
, 0);
1431 #ifdef TCP_SIGNATURE
1432 case TCP_SIGNATURE_ENABLE
:
1433 if (tp
->t_state
== TCPS_CLOSED
) {
1435 * This is the only safe state that this
1436 * option could be changed. Some segments
1437 * could already have been sent in other
1441 tp
->t_flags
|= TF_SIGNATURE
;
1443 tp
->t_flags
&= ~TF_SIGNATURE
;
1448 #endif /* TCP_SIGNATURE */
1451 switch (sopt
->sopt_name
) {
1459 opt
= 0; /* dead code to fool gcc */
1466 tp
->t_flags
&= ~opt
;
1470 if (tcp_disable_nopush
)
1473 tp
->t_flags
|= TF_NOPUSH
;
1475 tp
->t_flags
&= ~TF_NOPUSH
;
1476 error
= tcp_output(tp
);
1482 * Must be between 0 and maxseg. If the requested
1483 * maxseg is too small to satisfy the desired minmss,
1484 * pump it up (silently so sysctl modifications of
1485 * minmss do not create unexpected program failures).
1486 * Handle degenerate cases.
1488 if (optval
> 0 && optval
<= tp
->t_maxseg
) {
1489 if (optval
+ 40 < tcp_minmss
) {
1490 optval
= tcp_minmss
- 40;
1494 tp
->t_maxseg
= optval
;
1501 opthz
= ((int64_t)optval
* hz
) / 1000;
1503 tp
->t_keepinit
= opthz
;
1509 opthz
= ((int64_t)optval
* hz
) / 1000;
1511 tp
->t_keepidle
= opthz
;
1512 tcp_timer_keep_activity(tp
, 0);
1519 opthz
= ((int64_t)optval
* hz
) / 1000;
1521 tp
->t_keepintvl
= opthz
;
1522 tp
->t_maxidle
= tp
->t_keepintvl
* tp
->t_keepcnt
;
1530 tp
->t_keepcnt
= optval
;
1531 tp
->t_maxidle
= tp
->t_keepintvl
* tp
->t_keepcnt
;
1538 error
= ENOPROTOOPT
;
1544 switch (sopt
->sopt_name
) {
1545 #ifdef TCP_SIGNATURE
1546 case TCP_SIGNATURE_ENABLE
:
1547 optval
= (tp
->t_flags
& TF_SIGNATURE
) ? 1 : 0;
1549 #endif /* TCP_SIGNATURE */
1551 optval
= tp
->t_flags
& TF_NODELAY
;
1554 optval
= tp
->t_maxseg
;
1557 optval
= tp
->t_flags
& TF_NOOPT
;
1560 optval
= tp
->t_flags
& TF_NOPUSH
;
1563 optval
= ((int64_t)tp
->t_keepinit
* 1000) / hz
;
1566 optval
= ((int64_t)tp
->t_keepidle
* 1000) / hz
;
1569 optval
= ((int64_t)tp
->t_keepintvl
* 1000) / hz
;
1572 optval
= tp
->t_keepcnt
;
1575 error
= ENOPROTOOPT
;
1579 soopt_from_kbuf(sopt
, &optval
, sizeof optval
);
1583 lwkt_replymsg(&msg
->lmsg
, error
);
1587 * tcp_sendspace and tcp_recvspace are the default send and receive window
1588 * sizes, respectively. These are obsolescent (this information should
1589 * be set by the route).
1591 * Use a default that does not require tcp window scaling to be turned
1592 * on. Individual programs or the administrator can increase the default.
1594 u_long tcp_sendspace
= 57344; /* largest multiple of PAGE_SIZE < 64k */
1595 SYSCTL_INT(_net_inet_tcp
, TCPCTL_SENDSPACE
, sendspace
, CTLFLAG_RW
,
1596 &tcp_sendspace
, 0, "Maximum outgoing TCP datagram size");
1597 u_long tcp_recvspace
= 57344; /* largest multiple of PAGE_SIZE < 64k */
1598 SYSCTL_INT(_net_inet_tcp
, TCPCTL_RECVSPACE
, recvspace
, CTLFLAG_RW
,
1599 &tcp_recvspace
, 0, "Maximum incoming TCP datagram size");
1602 * Attach TCP protocol to socket, allocating internet protocol control
1603 * block, tcp control block, buffer space, and entering CLOSED state.
1606 tcp_attach(struct socket
*so
, struct pru_attach_info
*ai
)
1613 boolean_t isipv6
= INP_CHECK_SOCKAF(so
, AF_INET6
);
1617 error
= tcp_usr_preattach(so
, 0 /* don't care */, ai
);
1621 /* Post attach; do nothing */
1624 cpu
= mycpu
->gd_cpuid
;
1627 * Set the default pcbinfo. This will likely change when we
1630 error
= in_pcballoc(so
, &tcbinfo
[cpu
]);
1636 inp
->in6p_hops
= -1; /* use kernel default */
1638 tp
= tcp_newtcpcb(inp
);
1639 KASSERT(tp
!= NULL
, ("tcp_newtcpcb failed"));
1640 tp
->t_state
= TCPS_CLOSED
;
1641 /* Keep a reference for asynchronized pru_rcvd */
1647 * Initiate (or continue) disconnect.
1648 * If embryonic state, just send reset (once).
1649 * If in ``let data drain'' option and linger null, just drop.
1650 * Otherwise (hard), mark socket disconnecting and drop
1651 * current input data; switch states based on user close, and
1652 * send segment to peer (with FIN).
1654 static struct tcpcb
*
1655 tcp_disconnect(struct tcpcb
*tp
)
1657 struct socket
*so
= tp
->t_inpcb
->inp_socket
;
1659 if (tp
->t_state
< TCPS_ESTABLISHED
) {
1661 } else if ((so
->so_options
& SO_LINGER
) && so
->so_linger
== 0) {
1662 tp
= tcp_drop(tp
, 0);
1664 lwkt_gettoken(&so
->so_rcv
.ssb_token
);
1665 soisdisconnecting(so
);
1666 sbflush(&so
->so_rcv
.sb
);
1667 tp
= tcp_usrclosed(tp
);
1670 lwkt_reltoken(&so
->so_rcv
.ssb_token
);
1676 * User issued close, and wish to trail through shutdown states:
1677 * if never received SYN, just forget it. If got a SYN from peer,
1678 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
1679 * If already got a FIN from peer, then almost done; go to LAST_ACK
1680 * state. In all other cases, have already sent FIN to peer (e.g.
1681 * after PRU_SHUTDOWN), and just have to play tedious game waiting
1682 * for peer to send FIN or not respond to keep-alives, etc.
1683 * We can let the user exit from the close as soon as the FIN is acked.
1685 static struct tcpcb
*
1686 tcp_usrclosed(struct tcpcb
*tp
)
1689 switch (tp
->t_state
) {
1693 tp
->t_state
= TCPS_CLOSED
;
1698 case TCPS_SYN_RECEIVED
:
1699 tp
->t_flags
|= TF_NEEDFIN
;
1702 case TCPS_ESTABLISHED
:
1703 tp
->t_state
= TCPS_FIN_WAIT_1
;
1706 case TCPS_CLOSE_WAIT
:
1707 tp
->t_state
= TCPS_LAST_ACK
;
1710 if (tp
&& tp
->t_state
>= TCPS_FIN_WAIT_2
) {
1711 soisdisconnected(tp
->t_inpcb
->inp_socket
);
1712 /* To prevent the connection hanging in FIN_WAIT_2 forever. */
1713 if (tp
->t_state
== TCPS_FIN_WAIT_2
) {
1714 tcp_callout_reset(tp
, tp
->tt_2msl
, tp
->t_maxidle
,