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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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 tcp_sosetport(struct lwkt_msg
*msg
, lwkt_port_t port
)
293 sosetport(((struct netmsg_base
*)msg
)->nm_so
, port
);
297 * Give the socket an address.
300 tcp_usr_bind(netmsg_t msg
)
302 struct socket
*so
= msg
->bind
.base
.nm_so
;
303 struct sockaddr
*nam
= msg
->bind
.nm_nam
;
304 struct thread
*td
= msg
->bind
.nm_td
;
308 struct sockaddr_in
*sinp
;
309 lwkt_port_t port0
= netisr_cpuport(0);
311 COMMON_START(so
, inp
, 0);
314 * Must check for multicast addresses and disallow binding
317 sinp
= (struct sockaddr_in
*)nam
;
318 if (sinp
->sin_family
== AF_INET
&&
319 IN_MULTICAST(ntohl(sinp
->sin_addr
.s_addr
))) {
320 error
= EAFNOSUPPORT
;
325 * Check "already bound" here (in_pcbbind() does the same check
326 * though), so we don't forward a connected socket to netisr0,
327 * which would panic in the following in_pcbunlink().
329 if (inp
->inp_lport
!= 0 || inp
->inp_laddr
.s_addr
!= INADDR_ANY
) {
330 error
= EINVAL
; /* already bound */
335 * Use netisr0 to serialize in_pcbbind(), so that pru_detach and
336 * pru_bind for different sockets on the same local port could be
337 * properly ordered. The original race is illustrated here for
342 * close(s1); <----- asynchronous
346 * All will expect bind(s2, *.PORT) to succeed. However, it will
347 * fail, if following sequence happens due to random socket initial
348 * msgport and asynchronous close(2):
352 * : pru_bind(s2) [*.PORT is used by s1]
355 if (&curthread
->td_msgport
!= port0
) {
356 lwkt_msg_t lmsg
= &msg
->bind
.base
.lmsg
;
358 KASSERT((msg
->bind
.nm_flags
& PRUB_RELINK
) == 0,
359 ("already asked to relink"));
361 in_pcbunlink(so
->so_pcb
, &tcbinfo
[mycpuid
]);
362 msg
->bind
.nm_flags
|= PRUB_RELINK
;
364 /* See the related comment in tcp_connect() */
365 lwkt_setmsg_receipt(lmsg
, tcp_sosetport
);
366 lwkt_forwardmsg(port0
, lmsg
);
367 /* msg invalid now */
370 KASSERT(so
->so_port
== port0
, ("so_port is not netisr0"));
372 if (msg
->bind
.nm_flags
& PRUB_RELINK
) {
373 msg
->bind
.nm_flags
&= ~PRUB_RELINK
;
374 in_pcblink(so
->so_pcb
, &tcbinfo
[mycpuid
]);
376 KASSERT(inp
->inp_pcbinfo
== &tcbinfo
[0], ("pcbinfo is not tcbinfo0"));
378 error
= in_pcbbind(inp
, nam
, td
);
382 COMMON_END(PRU_BIND
);
388 tcp6_usr_bind(netmsg_t msg
)
390 struct socket
*so
= msg
->bind
.base
.nm_so
;
391 struct sockaddr
*nam
= msg
->bind
.nm_nam
;
392 struct thread
*td
= msg
->bind
.nm_td
;
396 struct sockaddr_in6
*sin6p
;
398 COMMON_START(so
, inp
, 0);
401 * Must check for multicast addresses and disallow binding
404 sin6p
= (struct sockaddr_in6
*)nam
;
405 if (sin6p
->sin6_family
== AF_INET6
&&
406 IN6_IS_ADDR_MULTICAST(&sin6p
->sin6_addr
)) {
407 error
= EAFNOSUPPORT
;
410 error
= in6_pcbbind(inp
, nam
, td
);
413 COMMON_END(PRU_BIND
);
417 struct netmsg_inswildcard
{
418 struct netmsg_base base
;
419 struct inpcb
*nm_inp
;
423 in_pcbinswildcardhash_handler(netmsg_t msg
)
425 struct netmsg_inswildcard
*nm
= (struct netmsg_inswildcard
*)msg
;
426 int cpu
= mycpuid
, nextcpu
;
428 in_pcbinswildcardhash_oncpu(nm
->nm_inp
, &tcbinfo
[cpu
]);
431 if (nextcpu
< ncpus2
)
432 lwkt_forwardmsg(netisr_cpuport(nextcpu
), &nm
->base
.lmsg
);
434 lwkt_replymsg(&nm
->base
.lmsg
, 0);
438 * Prepare to accept connections.
441 tcp_usr_listen(netmsg_t msg
)
443 struct socket
*so
= msg
->listen
.base
.nm_so
;
444 struct thread
*td
= msg
->listen
.nm_td
;
448 struct netmsg_inswildcard nm
;
449 lwkt_port_t port0
= netisr_cpuport(0);
451 COMMON_START(so
, inp
, 0);
453 if (&curthread
->td_msgport
!= port0
) {
454 lwkt_msg_t lmsg
= &msg
->listen
.base
.lmsg
;
456 KASSERT((msg
->listen
.nm_flags
& PRUL_RELINK
) == 0,
457 ("already asked to relink"));
459 in_pcbunlink(so
->so_pcb
, &tcbinfo
[mycpuid
]);
460 msg
->listen
.nm_flags
|= PRUL_RELINK
;
462 /* See the related comment in tcp_connect() */
463 lwkt_setmsg_receipt(lmsg
, tcp_sosetport
);
464 lwkt_forwardmsg(port0
, lmsg
);
465 /* msg invalid now */
468 KASSERT(so
->so_port
== port0
, ("so_port is not netisr0"));
470 if (msg
->listen
.nm_flags
& PRUL_RELINK
) {
471 msg
->listen
.nm_flags
&= ~PRUL_RELINK
;
472 in_pcblink(so
->so_pcb
, &tcbinfo
[mycpuid
]);
474 KASSERT(inp
->inp_pcbinfo
== &tcbinfo
[0], ("pcbinfo is not tcbinfo0"));
476 if (tp
->t_flags
& TF_LISTEN
)
479 if (inp
->inp_lport
== 0) {
480 error
= in_pcbbind(inp
, NULL
, td
);
485 tp
->t_state
= TCPS_LISTEN
;
486 tp
->t_flags
|= TF_LISTEN
;
487 tp
->tt_msg
= NULL
; /* Catch any invalid timer usage */
491 * Put this inpcb into wildcard hash on other cpus.
493 ASSERT_INP_NOTINHASH(inp
);
494 netmsg_init(&nm
.base
, NULL
, &curthread
->td_msgport
,
495 MSGF_PRIORITY
, in_pcbinswildcardhash_handler
);
497 lwkt_domsg(netisr_cpuport(1), &nm
.base
.lmsg
, 0);
499 in_pcbinswildcardhash(inp
);
500 COMMON_END(PRU_LISTEN
);
506 tcp6_usr_listen(netmsg_t msg
)
508 struct socket
*so
= msg
->listen
.base
.nm_so
;
509 struct thread
*td
= msg
->listen
.nm_td
;
513 struct netmsg_inswildcard nm
;
515 COMMON_START(so
, inp
, 0);
517 if (tp
->t_flags
& TF_LISTEN
)
520 if (inp
->inp_lport
== 0) {
521 error
= in6_pcbbind(inp
, NULL
, td
);
526 tp
->t_state
= TCPS_LISTEN
;
527 tp
->t_flags
|= TF_LISTEN
;
528 tp
->tt_msg
= NULL
; /* Catch any invalid timer usage */
532 * Put this inpcb into wildcard hash on other cpus.
534 KKASSERT(so
->so_port
== netisr_cpuport(0));
536 KKASSERT(inp
->inp_pcbinfo
== &tcbinfo
[0]);
537 ASSERT_INP_NOTINHASH(inp
);
539 netmsg_init(&nm
.base
, NULL
, &curthread
->td_msgport
,
540 MSGF_PRIORITY
, in_pcbinswildcardhash_handler
);
542 lwkt_domsg(netisr_cpuport(1), &nm
.base
.lmsg
, 0);
544 in_pcbinswildcardhash(inp
);
545 COMMON_END(PRU_LISTEN
);
550 * Initiate connection to peer.
551 * Create a template for use in transmissions on this connection.
552 * Enter SYN_SENT state, and mark socket as connecting.
553 * Start keep-alive timer, and seed output sequence space.
554 * Send initial segment on connection.
557 tcp_usr_connect(netmsg_t msg
)
559 struct socket
*so
= msg
->connect
.base
.nm_so
;
560 struct sockaddr
*nam
= msg
->connect
.nm_nam
;
561 struct thread
*td
= msg
->connect
.nm_td
;
565 struct sockaddr_in
*sinp
;
567 COMMON_START(so
, inp
, 0);
570 * Must disallow TCP ``connections'' to multicast addresses.
572 sinp
= (struct sockaddr_in
*)nam
;
573 if (sinp
->sin_family
== AF_INET
574 && IN_MULTICAST(ntohl(sinp
->sin_addr
.s_addr
))) {
575 error
= EAFNOSUPPORT
;
579 if (!prison_remote_ip(td
, (struct sockaddr
*)sinp
)) {
580 error
= EAFNOSUPPORT
; /* IPv6 only jail */
585 /* msg is invalid now */
588 if (msg
->connect
.nm_m
) {
589 m_freem(msg
->connect
.nm_m
);
590 msg
->connect
.nm_m
= NULL
;
592 if (msg
->connect
.nm_flags
& PRUC_HELDTD
)
594 if (error
&& (msg
->connect
.nm_flags
& PRUC_ASYNC
)) {
595 so
->so_error
= error
;
596 soisdisconnected(so
);
598 lwkt_replymsg(&msg
->lmsg
, error
);
604 tcp6_usr_connect(netmsg_t msg
)
606 struct socket
*so
= msg
->connect
.base
.nm_so
;
607 struct sockaddr
*nam
= msg
->connect
.nm_nam
;
608 struct thread
*td
= msg
->connect
.nm_td
;
612 struct sockaddr_in6
*sin6p
;
614 COMMON_START(so
, inp
, 0);
617 * Must disallow TCP ``connections'' to multicast addresses.
619 sin6p
= (struct sockaddr_in6
*)nam
;
620 if (sin6p
->sin6_family
== AF_INET6
621 && IN6_IS_ADDR_MULTICAST(&sin6p
->sin6_addr
)) {
622 error
= EAFNOSUPPORT
;
626 if (!prison_remote_ip(td
, nam
)) {
627 error
= EAFNOSUPPORT
; /* IPv4 only jail */
631 /* Reject v4-mapped address */
632 if (IN6_IS_ADDR_V4MAPPED(&sin6p
->sin6_addr
)) {
633 error
= EADDRNOTAVAIL
;
637 inp
->inp_inc
.inc_isipv6
= 1;
639 /* msg is invalid now */
642 if (msg
->connect
.nm_m
) {
643 m_freem(msg
->connect
.nm_m
);
644 msg
->connect
.nm_m
= NULL
;
646 lwkt_replymsg(&msg
->lmsg
, error
);
652 * Initiate disconnect from peer.
653 * If connection never passed embryonic stage, just drop;
654 * else if don't need to let data drain, then can just drop anyways,
655 * else have to begin TCP shutdown process: mark socket disconnecting,
656 * drain unread data, state switch to reflect user close, and
657 * send segment (e.g. FIN) to peer. Socket will be really disconnected
658 * when peer sends FIN and acks ours.
660 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
663 tcp_usr_disconnect(netmsg_t msg
)
665 struct socket
*so
= msg
->disconnect
.base
.nm_so
;
670 COMMON_START(so
, inp
, 1);
671 tp
= tcp_disconnect(tp
);
672 COMMON_END(PRU_DISCONNECT
);
676 * Accept a connection. Essentially all the work is
677 * done at higher levels; just return the address
678 * of the peer, storing through addr.
681 tcp_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
;
691 if (so
->so_state
& SS_ISDISCONNECTED
) {
692 error
= ECONNABORTED
;
702 in_setpeeraddr(so
, nam
);
703 COMMON_END(PRU_ACCEPT
);
708 tcp6_usr_accept(netmsg_t msg
)
710 struct socket
*so
= msg
->accept
.base
.nm_so
;
711 struct sockaddr
**nam
= msg
->accept
.nm_nam
;
714 struct tcpcb
*tp
= NULL
;
719 if (so
->so_state
& SS_ISDISCONNECTED
) {
720 error
= ECONNABORTED
;
729 in6_setpeeraddr(so
, nam
);
730 COMMON_END(PRU_ACCEPT
);
735 * Mark the connection as being incapable of further output.
738 tcp_usr_shutdown(netmsg_t msg
)
740 struct socket
*so
= msg
->shutdown
.base
.nm_so
;
745 COMMON_START(so
, inp
, 0);
747 tp
= tcp_usrclosed(tp
);
749 error
= tcp_output(tp
);
750 COMMON_END(PRU_SHUTDOWN
);
754 * After a receive, possibly send window update to peer.
757 tcp_usr_rcvd(netmsg_t msg
)
759 struct socket
*so
= msg
->rcvd
.base
.nm_so
;
760 int error
= 0, noreply
= 0;
764 COMMON_START(so
, inp
, 0);
766 if (msg
->rcvd
.nm_pru_flags
& PRUR_ASYNC
) {
768 so_async_rcvd_reply(so
);
772 COMMON_END1(PRU_RCVD
, noreply
);
776 * Do a send by putting data in output queue and updating urgent
777 * marker if URG set. Possibly send more data. Unlike the other
778 * pru_*() routines, the mbuf chains are our responsibility. We
779 * must either enqueue them or free them. The other pru_* routines
780 * generally are caller-frees.
783 tcp_usr_send(netmsg_t msg
)
785 struct socket
*so
= msg
->send
.base
.nm_so
;
786 int flags
= msg
->send
.nm_flags
;
787 struct mbuf
*m
= msg
->send
.nm_m
;
793 KKASSERT(msg
->send
.nm_control
== NULL
);
794 KKASSERT(msg
->send
.nm_addr
== NULL
);
795 KKASSERT((flags
& PRUS_FREEADDR
) == 0);
801 * OOPS! we lost a race, the TCP session got reset after
802 * we checked SS_CANTSENDMORE, eg: while doing uiomove or a
803 * network interrupt in the non-critical section of sosend().
806 error
= ECONNRESET
; /* XXX EPIPE? */
816 * This is no longer necessary, since:
817 * - sosendtcp() has already checked it for us
818 * - It does not work with asynchronized send
822 * Don't let too much OOB data build up
824 if (flags
& PRUS_OOB
) {
825 if (ssb_space(&so
->so_snd
) < -512) {
834 * Pump the data into the socket.
837 ssb_appendstream(&so
->so_snd
, m
);
840 if (flags
& PRUS_OOB
) {
842 * According to RFC961 (Assigned Protocols),
843 * the urgent pointer points to the last octet
844 * of urgent data. We continue, however,
845 * to consider it to indicate the first octet
846 * of data past the urgent section.
847 * Otherwise, snd_up should be one lower.
849 tp
->snd_up
= tp
->snd_una
+ so
->so_snd
.ssb_cc
;
850 tp
->t_flags
|= TF_FORCE
;
851 error
= tcp_output(tp
);
852 tp
->t_flags
&= ~TF_FORCE
;
854 if (flags
& PRUS_EOF
) {
856 * Close the send side of the connection after
860 tp
= tcp_usrclosed(tp
);
862 if (tp
!= NULL
&& !tcp_output_pending(tp
)) {
863 if (flags
& PRUS_MORETOCOME
)
864 tp
->t_flags
|= TF_MORETOCOME
;
865 error
= tcp_output_fair(tp
);
866 if (flags
& PRUS_MORETOCOME
)
867 tp
->t_flags
&= ~TF_MORETOCOME
;
870 COMMON_END1((flags
& PRUS_OOB
) ? PRU_SENDOOB
:
871 ((flags
& PRUS_EOF
) ? PRU_SEND_EOF
: PRU_SEND
),
872 (flags
& PRUS_NOREPLY
));
876 * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort()
877 * will sofree() it when we return.
880 tcp_usr_abort(netmsg_t msg
)
882 struct socket
*so
= msg
->abort
.base
.nm_so
;
887 COMMON_START(so
, inp
, 1);
888 tp
= tcp_drop(tp
, ECONNABORTED
);
889 COMMON_END(PRU_ABORT
);
893 * Receive out-of-band data.
896 tcp_usr_rcvoob(netmsg_t msg
)
898 struct socket
*so
= msg
->rcvoob
.base
.nm_so
;
899 struct mbuf
*m
= msg
->rcvoob
.nm_m
;
900 int flags
= msg
->rcvoob
.nm_flags
;
905 COMMON_START(so
, inp
, 0);
906 if ((so
->so_oobmark
== 0 &&
907 (so
->so_state
& SS_RCVATMARK
) == 0) ||
908 so
->so_options
& SO_OOBINLINE
||
909 tp
->t_oobflags
& TCPOOB_HADDATA
) {
913 if ((tp
->t_oobflags
& TCPOOB_HAVEDATA
) == 0) {
918 *mtod(m
, caddr_t
) = tp
->t_iobc
;
919 if ((flags
& MSG_PEEK
) == 0)
920 tp
->t_oobflags
^= (TCPOOB_HAVEDATA
| TCPOOB_HADDATA
);
921 COMMON_END(PRU_RCVOOB
);
925 tcp_usr_savefaddr(struct socket
*so
, const struct sockaddr
*faddr
)
927 in_savefaddr(so
, faddr
);
932 tcp6_usr_savefaddr(struct socket
*so
, const struct sockaddr
*faddr
)
934 in6_savefaddr(so
, faddr
);
939 tcp_usr_preconnect(struct socket
*so
, const struct sockaddr
*nam
,
940 struct thread
*td __unused
)
942 const struct sockaddr_in
*sinp
;
944 sinp
= (const struct sockaddr_in
*)nam
;
945 if (sinp
->sin_family
== AF_INET
&&
946 IN_MULTICAST(ntohl(sinp
->sin_addr
.s_addr
)))
953 /* xxx - should be const */
954 struct pr_usrreqs tcp_usrreqs
= {
955 .pru_abort
= tcp_usr_abort
,
956 .pru_accept
= tcp_usr_accept
,
957 .pru_attach
= tcp_usr_attach
,
958 .pru_bind
= tcp_usr_bind
,
959 .pru_connect
= tcp_usr_connect
,
960 .pru_connect2
= pr_generic_notsupp
,
961 .pru_control
= in_control_dispatch
,
962 .pru_detach
= tcp_usr_detach
,
963 .pru_disconnect
= tcp_usr_disconnect
,
964 .pru_listen
= tcp_usr_listen
,
965 .pru_peeraddr
= in_setpeeraddr_dispatch
,
966 .pru_rcvd
= tcp_usr_rcvd
,
967 .pru_rcvoob
= tcp_usr_rcvoob
,
968 .pru_send
= tcp_usr_send
,
969 .pru_sense
= pru_sense_null
,
970 .pru_shutdown
= tcp_usr_shutdown
,
971 .pru_sockaddr
= in_setsockaddr_dispatch
,
972 .pru_sosend
= sosendtcp
,
973 .pru_soreceive
= sorecvtcp
,
974 .pru_savefaddr
= tcp_usr_savefaddr
,
975 .pru_preconnect
= tcp_usr_preconnect
,
976 .pru_preattach
= tcp_usr_preattach
980 struct pr_usrreqs tcp6_usrreqs
= {
981 .pru_abort
= tcp_usr_abort
,
982 .pru_accept
= tcp6_usr_accept
,
983 .pru_attach
= tcp_usr_attach
,
984 .pru_bind
= tcp6_usr_bind
,
985 .pru_connect
= tcp6_usr_connect
,
986 .pru_connect2
= pr_generic_notsupp
,
987 .pru_control
= in6_control_dispatch
,
988 .pru_detach
= tcp_usr_detach
,
989 .pru_disconnect
= tcp_usr_disconnect
,
990 .pru_listen
= tcp6_usr_listen
,
991 .pru_peeraddr
= in6_setpeeraddr_dispatch
,
992 .pru_rcvd
= tcp_usr_rcvd
,
993 .pru_rcvoob
= tcp_usr_rcvoob
,
994 .pru_send
= tcp_usr_send
,
995 .pru_sense
= pru_sense_null
,
996 .pru_shutdown
= tcp_usr_shutdown
,
997 .pru_sockaddr
= in6_setsockaddr_dispatch
,
998 .pru_sosend
= sosendtcp
,
999 .pru_soreceive
= sorecvtcp
,
1000 .pru_savefaddr
= tcp6_usr_savefaddr
1005 tcp_connect_oncpu(struct tcpcb
*tp
, int flags
, struct mbuf
*m
,
1006 struct sockaddr_in
*sin
, struct sockaddr_in
*if_sin
)
1008 struct inpcb
*inp
= tp
->t_inpcb
, *oinp
;
1009 struct socket
*so
= inp
->inp_socket
;
1010 struct route
*ro
= &inp
->inp_route
;
1012 KASSERT(inp
->inp_pcbinfo
== &tcbinfo
[mycpu
->gd_cpuid
],
1013 ("pcbinfo mismatch"));
1015 oinp
= in_pcblookup_hash(inp
->inp_pcbinfo
,
1016 sin
->sin_addr
, sin
->sin_port
,
1017 (inp
->inp_laddr
.s_addr
!= INADDR_ANY
?
1018 inp
->inp_laddr
: if_sin
->sin_addr
),
1019 inp
->inp_lport
, 0, NULL
);
1022 return (EADDRINUSE
);
1024 if (inp
->inp_laddr
.s_addr
== INADDR_ANY
)
1025 inp
->inp_laddr
= if_sin
->sin_addr
;
1026 inp
->inp_faddr
= sin
->sin_addr
;
1027 inp
->inp_fport
= sin
->sin_port
;
1028 in_pcbinsconnhash(inp
);
1031 * We are now on the inpcb's owner CPU, if the cached route was
1032 * freed because the rtentry's owner CPU is not the current CPU
1033 * (e.g. in tcp_connect()), then we try to reallocate it here with
1034 * the hope that a rtentry may be cloned from a RTF_PRCLONING
1037 if (!(inp
->inp_socket
->so_options
& SO_DONTROUTE
) && /*XXX*/
1038 ro
->ro_rt
== NULL
) {
1039 bzero(&ro
->ro_dst
, sizeof(struct sockaddr_in
));
1040 ro
->ro_dst
.sa_family
= AF_INET
;
1041 ro
->ro_dst
.sa_len
= sizeof(struct sockaddr_in
);
1042 ((struct sockaddr_in
*)&ro
->ro_dst
)->sin_addr
=
1048 * Now that no more errors can occur, change the protocol processing
1049 * port to the current thread (which is the correct thread).
1051 * Create TCP timer message now; we are on the tcpcb's owner
1054 tcp_create_timermsg(tp
, &curthread
->td_msgport
);
1057 * Compute window scaling to request. Use a larger scaling then
1058 * needed for the initial receive buffer in case the receive buffer
1061 if (tp
->request_r_scale
< TCP_MIN_WINSHIFT
)
1062 tp
->request_r_scale
= TCP_MIN_WINSHIFT
;
1063 while (tp
->request_r_scale
< TCP_MAX_WINSHIFT
&&
1064 (TCP_MAXWIN
<< tp
->request_r_scale
) < so
->so_rcv
.ssb_hiwat
1066 tp
->request_r_scale
++;
1070 tcpstat
.tcps_connattempt
++;
1071 tp
->t_state
= TCPS_SYN_SENT
;
1072 tcp_callout_reset(tp
, tp
->tt_keep
, tp
->t_keepinit
, tcp_timer_keep
);
1073 tp
->iss
= tcp_new_isn(tp
);
1074 tcp_sendseqinit(tp
);
1076 ssb_appendstream(&so
->so_snd
, m
);
1078 if (flags
& PRUS_OOB
)
1079 tp
->snd_up
= tp
->snd_una
+ so
->so_snd
.ssb_cc
;
1083 * Close the send side of the connection after
1084 * the data is sent if flagged.
1086 if ((flags
& (PRUS_OOB
|PRUS_EOF
)) == PRUS_EOF
) {
1088 tp
= tcp_usrclosed(tp
);
1090 return (tcp_output(tp
));
1094 * Common subroutine to open a TCP connection to remote host specified
1095 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local
1096 * port number if needed. Call in_pcbladdr to do the routing and to choose
1097 * a local host address (interface).
1098 * Initialize connection parameters and enter SYN-SENT state.
1101 tcp_connect(netmsg_t msg
)
1103 struct socket
*so
= msg
->connect
.base
.nm_so
;
1104 struct sockaddr
*nam
= msg
->connect
.nm_nam
;
1105 struct thread
*td
= msg
->connect
.nm_td
;
1106 struct sockaddr_in
*sin
= (struct sockaddr_in
*)nam
;
1107 struct sockaddr_in
*if_sin
= NULL
;
1113 COMMON_START(so
, inp
, 0);
1116 * Reconnect our pcb if we have to
1118 if (msg
->connect
.nm_flags
& PRUC_RECONNECT
) {
1119 msg
->connect
.nm_flags
&= ~PRUC_RECONNECT
;
1120 in_pcblink(so
->so_pcb
, &tcbinfo
[mycpu
->gd_cpuid
]);
1124 * Bind if we have to
1126 if (inp
->inp_lport
== 0) {
1127 if (tcp_lport_extension
) {
1128 KKASSERT(inp
->inp_laddr
.s_addr
== INADDR_ANY
);
1130 error
= in_pcbladdr(inp
, nam
, &if_sin
, td
);
1133 inp
->inp_laddr
.s_addr
= if_sin
->sin_addr
.s_addr
;
1135 error
= in_pcbbind_remote(inp
, nam
, td
);
1139 msg
->connect
.nm_flags
|= PRUC_HASLADDR
;
1141 error
= in_pcbbind(inp
, NULL
, td
);
1147 if ((msg
->connect
.nm_flags
& PRUC_HASLADDR
) == 0) {
1149 * Calculate the correct protocol processing thread. The
1150 * connect operation must run there. Set the forwarding
1151 * port before we forward the message or it will get bounced
1154 error
= in_pcbladdr(inp
, nam
, &if_sin
, td
);
1158 KKASSERT(inp
->inp_socket
== so
);
1160 port
= tcp_addrport(sin
->sin_addr
.s_addr
, sin
->sin_port
,
1161 (inp
->inp_laddr
.s_addr
!= INADDR_ANY
?
1162 inp
->inp_laddr
.s_addr
: if_sin
->sin_addr
.s_addr
),
1165 if (port
!= &curthread
->td_msgport
) {
1166 lwkt_msg_t lmsg
= &msg
->connect
.base
.lmsg
;
1169 * in_pcbladdr() may have allocated a route entry for us
1170 * on the current CPU, but we need a route entry on the
1171 * inpcb's owner CPU, so free it here.
1173 in_pcbresetroute(inp
);
1176 * We are moving the protocol processing port the socket
1177 * is on, we have to unlink here and re-link on the
1180 in_pcbunlink(so
->so_pcb
, &tcbinfo
[mycpu
->gd_cpuid
]);
1181 msg
->connect
.nm_flags
|= PRUC_RECONNECT
;
1182 msg
->connect
.base
.nm_dispatch
= tcp_connect
;
1185 * Use message put done receipt to change this socket's
1186 * so_port, i.e. _after_ this message was put onto the
1187 * target netisr's msgport but _before_ the message could
1188 * be pulled from the target netisr's msgport, so that:
1189 * - The upper half (socket code) will not see the new
1190 * msgport before this message reaches the new msgport
1191 * and messages for this socket will be ordered.
1192 * - This message will see the new msgport, when its
1193 * handler is called in the target netisr.
1196 * We MUST use messege put done receipt to change this
1198 * If we changed the so_port in this netisr after the
1199 * lwkt_forwardmsg (so messages for this socket will be
1200 * ordered) and changed the so_port in the target netisr
1201 * at the very beginning of this message's handler, we
1202 * would suffer so_port overwritten race, given this
1203 * message might be forwarded again.
1206 * This mechanism depends on that the netisr's msgport
1207 * is spin msgport (currently it is :).
1209 * If the upper half saw the new msgport before this
1210 * message reached the target netisr's msgport, the
1211 * messages sent from the upper half could reach the new
1212 * msgport before this message, thus there would be
1213 * message reordering. The worst case could be soclose()
1214 * saw the new msgport and the detach message could reach
1215 * the new msgport before this message, i.e. the inpcb
1216 * could have been destroyed when this message was still
1217 * pending on or on its way to the new msgport. Other
1218 * weird cases could also happen, e.g. inpcb->inp_pcbinfo,
1219 * since we have unlinked this inpcb from the current
1222 lwkt_setmsg_receipt(lmsg
, tcp_sosetport
);
1223 lwkt_forwardmsg(port
, lmsg
);
1224 /* msg invalid now */
1226 } else if (msg
->connect
.nm_flags
& PRUC_HELDTD
) {
1228 * The original thread is no longer needed; release it.
1231 msg
->connect
.nm_flags
&= ~PRUC_HELDTD
;
1233 error
= tcp_connect_oncpu(tp
, msg
->connect
.nm_sndflags
,
1234 msg
->connect
.nm_m
, sin
, if_sin
);
1235 msg
->connect
.nm_m
= NULL
;
1237 if (msg
->connect
.nm_m
) {
1238 m_freem(msg
->connect
.nm_m
);
1239 msg
->connect
.nm_m
= NULL
;
1241 if (msg
->connect
.nm_flags
& PRUC_HELDTD
)
1243 if (error
&& (msg
->connect
.nm_flags
& PRUC_ASYNC
)) {
1244 so
->so_error
= error
;
1245 soisdisconnected(so
);
1247 lwkt_replymsg(&msg
->connect
.base
.lmsg
, error
);
1248 /* msg invalid now */
1254 tcp6_connect(netmsg_t msg
)
1257 struct socket
*so
= msg
->connect
.base
.nm_so
;
1258 struct sockaddr
*nam
= msg
->connect
.nm_nam
;
1259 struct thread
*td
= msg
->connect
.nm_td
;
1261 struct sockaddr_in6
*sin6
= (struct sockaddr_in6
*)nam
;
1262 struct in6_addr
*addr6
;
1266 COMMON_START(so
, inp
, 0);
1269 * Reconnect our pcb if we have to
1271 if (msg
->connect
.nm_flags
& PRUC_RECONNECT
) {
1272 msg
->connect
.nm_flags
&= ~PRUC_RECONNECT
;
1273 in_pcblink(so
->so_pcb
, &tcbinfo
[mycpu
->gd_cpuid
]);
1277 * Bind if we have to
1279 if (inp
->inp_lport
== 0) {
1280 error
= in6_pcbbind(inp
, NULL
, td
);
1286 * Cannot simply call in_pcbconnect, because there might be an
1287 * earlier incarnation of this same connection still in
1288 * TIME_WAIT state, creating an ADDRINUSE error.
1290 error
= in6_pcbladdr(inp
, nam
, &addr6
, td
);
1294 port
= tcp6_addrport(); /* XXX hack for now, always cpu0 */
1296 if (port
!= &curthread
->td_msgport
) {
1297 lwkt_msg_t lmsg
= &msg
->connect
.base
.lmsg
;
1300 * in_pcbladdr() may have allocated a route entry for us
1301 * on the current CPU, but we need a route entry on the
1302 * inpcb's owner CPU, so free it here.
1304 in_pcbresetroute(inp
);
1306 in_pcbunlink(so
->so_pcb
, &tcbinfo
[mycpu
->gd_cpuid
]);
1307 msg
->connect
.nm_flags
|= PRUC_RECONNECT
;
1308 msg
->connect
.base
.nm_dispatch
= tcp6_connect
;
1310 /* See the related comment in tcp_connect() */
1311 lwkt_setmsg_receipt(lmsg
, tcp_sosetport
);
1312 lwkt_forwardmsg(port
, lmsg
);
1313 /* msg invalid now */
1316 error
= tcp6_connect_oncpu(tp
, msg
->connect
.nm_sndflags
,
1317 &msg
->connect
.nm_m
, sin6
, addr6
);
1318 /* nm_m may still be intact */
1320 if (msg
->connect
.nm_m
) {
1321 m_freem(msg
->connect
.nm_m
);
1322 msg
->connect
.nm_m
= NULL
;
1324 lwkt_replymsg(&msg
->connect
.base
.lmsg
, error
);
1325 /* msg invalid now */
1329 tcp6_connect_oncpu(struct tcpcb
*tp
, int flags
, struct mbuf
**mp
,
1330 struct sockaddr_in6
*sin6
, struct in6_addr
*addr6
)
1332 struct mbuf
*m
= *mp
;
1333 struct inpcb
*inp
= tp
->t_inpcb
;
1334 struct socket
*so
= inp
->inp_socket
;
1338 * Cannot simply call in_pcbconnect, because there might be an
1339 * earlier incarnation of this same connection still in
1340 * TIME_WAIT state, creating an ADDRINUSE error.
1342 oinp
= in6_pcblookup_hash(inp
->inp_pcbinfo
,
1343 &sin6
->sin6_addr
, sin6
->sin6_port
,
1344 (IN6_IS_ADDR_UNSPECIFIED(&inp
->in6p_laddr
) ?
1345 addr6
: &inp
->in6p_laddr
),
1346 inp
->inp_lport
, 0, NULL
);
1348 return (EADDRINUSE
);
1350 if (IN6_IS_ADDR_UNSPECIFIED(&inp
->in6p_laddr
))
1351 inp
->in6p_laddr
= *addr6
;
1352 inp
->in6p_faddr
= sin6
->sin6_addr
;
1353 inp
->inp_fport
= sin6
->sin6_port
;
1354 if ((sin6
->sin6_flowinfo
& IPV6_FLOWINFO_MASK
) != 0)
1355 inp
->in6p_flowinfo
= sin6
->sin6_flowinfo
;
1356 in_pcbinsconnhash(inp
);
1359 * Now that no more errors can occur, change the protocol processing
1360 * port to the current thread (which is the correct thread).
1362 * Create TCP timer message now; we are on the tcpcb's owner
1365 tcp_create_timermsg(tp
, &curthread
->td_msgport
);
1367 /* Compute window scaling to request. */
1368 if (tp
->request_r_scale
< TCP_MIN_WINSHIFT
)
1369 tp
->request_r_scale
= TCP_MIN_WINSHIFT
;
1370 while (tp
->request_r_scale
< TCP_MAX_WINSHIFT
&&
1371 (TCP_MAXWIN
<< tp
->request_r_scale
) < so
->so_rcv
.ssb_hiwat
) {
1372 tp
->request_r_scale
++;
1376 tcpstat
.tcps_connattempt
++;
1377 tp
->t_state
= TCPS_SYN_SENT
;
1378 tcp_callout_reset(tp
, tp
->tt_keep
, tp
->t_keepinit
, tcp_timer_keep
);
1379 tp
->iss
= tcp_new_isn(tp
);
1380 tcp_sendseqinit(tp
);
1382 ssb_appendstream(&so
->so_snd
, m
);
1384 if (flags
& PRUS_OOB
)
1385 tp
->snd_up
= tp
->snd_una
+ so
->so_snd
.ssb_cc
;
1389 * Close the send side of the connection after
1390 * the data is sent if flagged.
1392 if ((flags
& (PRUS_OOB
|PRUS_EOF
)) == PRUS_EOF
) {
1394 tp
= tcp_usrclosed(tp
);
1396 return (tcp_output(tp
));
1402 * The new sockopt interface makes it possible for us to block in the
1403 * copyin/out step (if we take a page fault). Taking a page fault while
1404 * in a critical section is probably a Bad Thing. (Since sockets and pcbs
1405 * both now use TSM, there probably isn't any need for this function to
1406 * run in a critical section any more. This needs more examination.)
1409 tcp_ctloutput(netmsg_t msg
)
1411 struct socket
*so
= msg
->base
.nm_so
;
1412 struct sockopt
*sopt
= msg
->ctloutput
.nm_sopt
;
1413 int error
, opt
, optval
, opthz
;
1423 tp
= intotcpcb(inp
);
1425 /* Get socket's owner cpuid hint */
1426 if (sopt
->sopt_level
== SOL_SOCKET
&&
1427 sopt
->sopt_dir
== SOPT_GET
&&
1428 sopt
->sopt_name
== SO_CPUHINT
) {
1429 if (tp
->t_flags
& TF_LISTEN
) {
1431 * Listen sockets owner cpuid is always 0,
1432 * which does not make sense if SO_REUSEPORT
1435 if (so
->so_options
& SO_REUSEPORT
)
1436 optval
= (inp
->inp_lgrpindex
& ncpus2_mask
);
1438 optval
= -1; /* no hint */
1442 soopt_from_kbuf(sopt
, &optval
, sizeof(optval
));
1446 if (sopt
->sopt_level
!= IPPROTO_TCP
) {
1447 if (sopt
->sopt_level
== IPPROTO_IP
) {
1448 switch (sopt
->sopt_name
) {
1449 case IP_MULTICAST_IF
:
1450 case IP_MULTICAST_VIF
:
1451 case IP_MULTICAST_TTL
:
1452 case IP_MULTICAST_LOOP
:
1453 case IP_ADD_MEMBERSHIP
:
1454 case IP_DROP_MEMBERSHIP
:
1456 * Multicast does not make sense on
1464 if (INP_CHECK_SOCKAF(so
, AF_INET6
))
1465 ip6_ctloutput_dispatch(msg
);
1469 /* msg invalid now */
1473 switch (sopt
->sopt_dir
) {
1475 error
= soopt_to_kbuf(sopt
, &optval
, sizeof optval
,
1479 switch (sopt
->sopt_name
) {
1482 tp
->t_keepidle
= tp
->t_keepintvl
;
1484 tp
->t_keepidle
= tcp_keepidle
;
1485 tcp_timer_keep_activity(tp
, 0);
1487 #ifdef TCP_SIGNATURE
1488 case TCP_SIGNATURE_ENABLE
:
1489 if (tp
->t_state
== TCPS_CLOSED
) {
1491 * This is the only safe state that this
1492 * option could be changed. Some segments
1493 * could already have been sent in other
1497 tp
->t_flags
|= TF_SIGNATURE
;
1499 tp
->t_flags
&= ~TF_SIGNATURE
;
1504 #endif /* TCP_SIGNATURE */
1507 switch (sopt
->sopt_name
) {
1515 opt
= 0; /* dead code to fool gcc */
1522 tp
->t_flags
&= ~opt
;
1526 if (tcp_disable_nopush
)
1529 tp
->t_flags
|= TF_NOPUSH
;
1531 tp
->t_flags
&= ~TF_NOPUSH
;
1532 error
= tcp_output(tp
);
1538 * Must be between 0 and maxseg. If the requested
1539 * maxseg is too small to satisfy the desired minmss,
1540 * pump it up (silently so sysctl modifications of
1541 * minmss do not create unexpected program failures).
1542 * Handle degenerate cases.
1544 if (optval
> 0 && optval
<= tp
->t_maxseg
) {
1545 if (optval
+ 40 < tcp_minmss
) {
1546 optval
= tcp_minmss
- 40;
1550 tp
->t_maxseg
= optval
;
1557 opthz
= ((int64_t)optval
* hz
) / 1000;
1559 tp
->t_keepinit
= opthz
;
1565 opthz
= ((int64_t)optval
* hz
) / 1000;
1567 tp
->t_keepidle
= opthz
;
1568 tcp_timer_keep_activity(tp
, 0);
1575 opthz
= ((int64_t)optval
* hz
) / 1000;
1577 tp
->t_keepintvl
= opthz
;
1578 tp
->t_maxidle
= tp
->t_keepintvl
* tp
->t_keepcnt
;
1586 tp
->t_keepcnt
= optval
;
1587 tp
->t_maxidle
= tp
->t_keepintvl
* tp
->t_keepcnt
;
1594 error
= ENOPROTOOPT
;
1600 switch (sopt
->sopt_name
) {
1601 #ifdef TCP_SIGNATURE
1602 case TCP_SIGNATURE_ENABLE
:
1603 optval
= (tp
->t_flags
& TF_SIGNATURE
) ? 1 : 0;
1605 #endif /* TCP_SIGNATURE */
1607 optval
= tp
->t_flags
& TF_NODELAY
;
1610 optval
= tp
->t_maxseg
;
1613 optval
= tp
->t_flags
& TF_NOOPT
;
1616 optval
= tp
->t_flags
& TF_NOPUSH
;
1619 optval
= ((int64_t)tp
->t_keepinit
* 1000) / hz
;
1622 optval
= ((int64_t)tp
->t_keepidle
* 1000) / hz
;
1625 optval
= ((int64_t)tp
->t_keepintvl
* 1000) / hz
;
1628 optval
= tp
->t_keepcnt
;
1631 error
= ENOPROTOOPT
;
1635 soopt_from_kbuf(sopt
, &optval
, sizeof optval
);
1639 lwkt_replymsg(&msg
->lmsg
, error
);
1643 * tcp_sendspace and tcp_recvspace are the default send and receive window
1644 * sizes, respectively. These are obsolescent (this information should
1645 * be set by the route).
1647 * Use a default that does not require tcp window scaling to be turned
1648 * on. Individual programs or the administrator can increase the default.
1650 u_long tcp_sendspace
= 57344; /* largest multiple of PAGE_SIZE < 64k */
1651 SYSCTL_INT(_net_inet_tcp
, TCPCTL_SENDSPACE
, sendspace
, CTLFLAG_RW
,
1652 &tcp_sendspace
, 0, "Maximum outgoing TCP datagram size");
1653 u_long tcp_recvspace
= 57344; /* largest multiple of PAGE_SIZE < 64k */
1654 SYSCTL_INT(_net_inet_tcp
, TCPCTL_RECVSPACE
, recvspace
, CTLFLAG_RW
,
1655 &tcp_recvspace
, 0, "Maximum incoming TCP datagram size");
1658 * Attach TCP protocol to socket, allocating internet protocol control
1659 * block, tcp control block, buffer space, and entering CLOSED state.
1662 tcp_attach(struct socket
*so
, struct pru_attach_info
*ai
)
1669 boolean_t isipv6
= INP_CHECK_SOCKAF(so
, AF_INET6
);
1673 error
= tcp_usr_preattach(so
, 0 /* don't care */, ai
);
1677 /* Post attach; do nothing */
1680 cpu
= mycpu
->gd_cpuid
;
1683 * Set the default pcbinfo. This will likely change when we
1686 error
= in_pcballoc(so
, &tcbinfo
[cpu
]);
1692 inp
->in6p_hops
= -1; /* use kernel default */
1694 tp
= tcp_newtcpcb(inp
);
1695 KASSERT(tp
!= NULL
, ("tcp_newtcpcb failed"));
1696 tp
->t_state
= TCPS_CLOSED
;
1697 /* Keep a reference for asynchronized pru_rcvd */
1703 * Initiate (or continue) disconnect.
1704 * If embryonic state, just send reset (once).
1705 * If in ``let data drain'' option and linger null, just drop.
1706 * Otherwise (hard), mark socket disconnecting and drop
1707 * current input data; switch states based on user close, and
1708 * send segment to peer (with FIN).
1710 static struct tcpcb
*
1711 tcp_disconnect(struct tcpcb
*tp
)
1713 struct socket
*so
= tp
->t_inpcb
->inp_socket
;
1715 if (tp
->t_state
< TCPS_ESTABLISHED
) {
1717 } else if ((so
->so_options
& SO_LINGER
) && so
->so_linger
== 0) {
1718 tp
= tcp_drop(tp
, 0);
1720 lwkt_gettoken(&so
->so_rcv
.ssb_token
);
1721 soisdisconnecting(so
);
1722 sbflush(&so
->so_rcv
.sb
);
1723 tp
= tcp_usrclosed(tp
);
1726 lwkt_reltoken(&so
->so_rcv
.ssb_token
);
1732 * User issued close, and wish to trail through shutdown states:
1733 * if never received SYN, just forget it. If got a SYN from peer,
1734 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
1735 * If already got a FIN from peer, then almost done; go to LAST_ACK
1736 * state. In all other cases, have already sent FIN to peer (e.g.
1737 * after PRU_SHUTDOWN), and just have to play tedious game waiting
1738 * for peer to send FIN or not respond to keep-alives, etc.
1739 * We can let the user exit from the close as soon as the FIN is acked.
1741 static struct tcpcb
*
1742 tcp_usrclosed(struct tcpcb
*tp
)
1745 switch (tp
->t_state
) {
1749 tp
->t_state
= TCPS_CLOSED
;
1754 case TCPS_SYN_RECEIVED
:
1755 tp
->t_flags
|= TF_NEEDFIN
;
1758 case TCPS_ESTABLISHED
:
1759 tp
->t_state
= TCPS_FIN_WAIT_1
;
1762 case TCPS_CLOSE_WAIT
:
1763 tp
->t_state
= TCPS_LAST_ACK
;
1766 if (tp
&& tp
->t_state
>= TCPS_FIN_WAIT_2
) {
1767 soisdisconnected(tp
->t_inpcb
->inp_socket
);
1768 /* To prevent the connection hanging in FIN_WAIT_2 forever. */
1769 if (tp
->t_state
== TCPS_FIN_WAIT_2
) {
1770 tcp_callout_reset(tp
, tp
->tt_2msl
, tp
->t_maxidle
,