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
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of The DragonFly Project nor the names of its
17 * contributors may be used to endorse or promote products derived
18 * from this software without specific, prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
24 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
27 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
30 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * Copyright (c) 1982, 1986, 1988, 1993
36 * The Regents of the University of California. All rights reserved.
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
41 * 1. Redistributions of source code must retain the above copyright
42 * notice, this list of conditions and the following disclaimer.
43 * 2. Redistributions in binary form must reproduce the above copyright
44 * notice, this list of conditions and the following disclaimer in the
45 * documentation and/or other materials provided with the distribution.
46 * 3. Neither the name of the University nor the names of its contributors
47 * may be used to endorse or promote products derived from this software
48 * without specific prior written permission.
50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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
);
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 TCP_STATE_MIGRATE_START(tp
);
366 /* See the related comment in tcp_connect() */
367 lwkt_setmsg_receipt(lmsg
, tcp_sosetport
);
368 lwkt_forwardmsg(port0
, lmsg
);
369 /* msg invalid now */
372 KASSERT(so
->so_port
== port0
, ("so_port is not netisr0"));
374 if (msg
->bind
.nm_flags
& PRUB_RELINK
) {
375 msg
->bind
.nm_flags
&= ~PRUB_RELINK
;
376 TCP_STATE_MIGRATE_END(tp
);
377 in_pcblink(so
->so_pcb
, &tcbinfo
[mycpuid
]);
379 KASSERT(inp
->inp_pcbinfo
== &tcbinfo
[0], ("pcbinfo is not tcbinfo0"));
381 error
= in_pcbbind(inp
, nam
, td
);
385 COMMON_END(PRU_BIND
);
391 tcp6_usr_bind(netmsg_t msg
)
393 struct socket
*so
= msg
->bind
.base
.nm_so
;
394 struct sockaddr
*nam
= msg
->bind
.nm_nam
;
395 struct thread
*td
= msg
->bind
.nm_td
;
399 struct sockaddr_in6
*sin6p
;
401 COMMON_START(so
, inp
, 0);
404 * Must check for multicast addresses and disallow binding
407 sin6p
= (struct sockaddr_in6
*)nam
;
408 if (sin6p
->sin6_family
== AF_INET6
&&
409 IN6_IS_ADDR_MULTICAST(&sin6p
->sin6_addr
)) {
410 error
= EAFNOSUPPORT
;
413 error
= in6_pcbbind(inp
, nam
, td
);
416 COMMON_END(PRU_BIND
);
420 struct netmsg_inswildcard
{
421 struct netmsg_base base
;
422 struct inpcb
*nm_inp
;
426 in_pcbinswildcardhash_handler(netmsg_t msg
)
428 struct netmsg_inswildcard
*nm
= (struct netmsg_inswildcard
*)msg
;
429 int cpu
= mycpuid
, nextcpu
;
431 in_pcbinswildcardhash_oncpu(nm
->nm_inp
, &tcbinfo
[cpu
]);
434 if (nextcpu
< ncpus2
)
435 lwkt_forwardmsg(netisr_cpuport(nextcpu
), &nm
->base
.lmsg
);
437 lwkt_replymsg(&nm
->base
.lmsg
, 0);
441 * Prepare to accept connections.
444 tcp_usr_listen(netmsg_t msg
)
446 struct socket
*so
= msg
->listen
.base
.nm_so
;
447 struct thread
*td
= msg
->listen
.nm_td
;
451 struct netmsg_inswildcard nm
;
452 lwkt_port_t port0
= netisr_cpuport(0);
454 COMMON_START(so
, inp
, 0);
456 if (&curthread
->td_msgport
!= port0
) {
457 lwkt_msg_t lmsg
= &msg
->listen
.base
.lmsg
;
459 KASSERT((msg
->listen
.nm_flags
& PRUL_RELINK
) == 0,
460 ("already asked to relink"));
462 in_pcbunlink(so
->so_pcb
, &tcbinfo
[mycpuid
]);
463 msg
->listen
.nm_flags
|= PRUL_RELINK
;
465 TCP_STATE_MIGRATE_START(tp
);
467 /* See the related comment in tcp_connect() */
468 lwkt_setmsg_receipt(lmsg
, tcp_sosetport
);
469 lwkt_forwardmsg(port0
, lmsg
);
470 /* msg invalid now */
473 KASSERT(so
->so_port
== port0
, ("so_port is not netisr0"));
475 if (msg
->listen
.nm_flags
& PRUL_RELINK
) {
476 msg
->listen
.nm_flags
&= ~PRUL_RELINK
;
477 TCP_STATE_MIGRATE_END(tp
);
478 in_pcblink(so
->so_pcb
, &tcbinfo
[mycpuid
]);
480 KASSERT(inp
->inp_pcbinfo
== &tcbinfo
[0], ("pcbinfo is not tcbinfo0"));
482 if (tp
->t_flags
& TF_LISTEN
)
485 if (inp
->inp_lport
== 0) {
486 error
= in_pcbbind(inp
, NULL
, td
);
491 TCP_STATE_CHANGE(tp
, TCPS_LISTEN
);
492 tp
->t_flags
|= TF_LISTEN
;
493 tp
->tt_msg
= NULL
; /* Catch any invalid timer usage */
496 * Create tcpcb per-cpu port cache
499 * This _must_ be done before installing this inpcb into
502 tcp_pcbport_create(tp
);
506 * Put this inpcb into wildcard hash on other cpus.
508 ASSERT_INP_NOTINHASH(inp
);
509 netmsg_init(&nm
.base
, NULL
, &curthread
->td_msgport
,
510 MSGF_PRIORITY
, in_pcbinswildcardhash_handler
);
512 lwkt_domsg(netisr_cpuport(1), &nm
.base
.lmsg
, 0);
514 in_pcbinswildcardhash(inp
);
515 COMMON_END(PRU_LISTEN
);
521 tcp6_usr_listen(netmsg_t msg
)
523 struct socket
*so
= msg
->listen
.base
.nm_so
;
524 struct thread
*td
= msg
->listen
.nm_td
;
528 struct netmsg_inswildcard nm
;
530 COMMON_START(so
, inp
, 0);
532 if (tp
->t_flags
& TF_LISTEN
)
535 if (inp
->inp_lport
== 0) {
536 error
= in6_pcbbind(inp
, NULL
, td
);
541 TCP_STATE_CHANGE(tp
, TCPS_LISTEN
);
542 tp
->t_flags
|= TF_LISTEN
;
543 tp
->tt_msg
= NULL
; /* Catch any invalid timer usage */
546 * Create tcpcb per-cpu port cache
549 * This _must_ be done before installing this inpcb into
552 tcp_pcbport_create(tp
);
556 * Put this inpcb into wildcard hash on other cpus.
558 KKASSERT(so
->so_port
== netisr_cpuport(0));
560 KKASSERT(inp
->inp_pcbinfo
== &tcbinfo
[0]);
561 ASSERT_INP_NOTINHASH(inp
);
563 netmsg_init(&nm
.base
, NULL
, &curthread
->td_msgport
,
564 MSGF_PRIORITY
, in_pcbinswildcardhash_handler
);
566 lwkt_domsg(netisr_cpuport(1), &nm
.base
.lmsg
, 0);
568 in_pcbinswildcardhash(inp
);
569 COMMON_END(PRU_LISTEN
);
574 * Initiate connection to peer.
575 * Create a template for use in transmissions on this connection.
576 * Enter SYN_SENT state, and mark socket as connecting.
577 * Start keep-alive timer, and seed output sequence space.
578 * Send initial segment on connection.
581 tcp_usr_connect(netmsg_t msg
)
583 struct socket
*so
= msg
->connect
.base
.nm_so
;
584 struct sockaddr
*nam
= msg
->connect
.nm_nam
;
585 struct thread
*td
= msg
->connect
.nm_td
;
589 struct sockaddr_in
*sinp
;
591 COMMON_START(so
, inp
, 0);
594 * Must disallow TCP ``connections'' to multicast addresses.
596 sinp
= (struct sockaddr_in
*)nam
;
597 if (sinp
->sin_family
== AF_INET
598 && IN_MULTICAST(ntohl(sinp
->sin_addr
.s_addr
))) {
599 error
= EAFNOSUPPORT
;
603 if (!prison_remote_ip(td
, (struct sockaddr
*)sinp
)) {
604 error
= EAFNOSUPPORT
; /* IPv6 only jail */
609 /* msg is invalid now */
612 if (msg
->connect
.nm_m
) {
613 m_freem(msg
->connect
.nm_m
);
614 msg
->connect
.nm_m
= NULL
;
616 if (msg
->connect
.nm_flags
& PRUC_HELDTD
)
618 if (error
&& (msg
->connect
.nm_flags
& PRUC_ASYNC
)) {
619 so
->so_error
= error
;
620 soisdisconnected(so
);
622 lwkt_replymsg(&msg
->lmsg
, error
);
628 tcp6_usr_connect(netmsg_t msg
)
630 struct socket
*so
= msg
->connect
.base
.nm_so
;
631 struct sockaddr
*nam
= msg
->connect
.nm_nam
;
632 struct thread
*td
= msg
->connect
.nm_td
;
636 struct sockaddr_in6
*sin6p
;
638 COMMON_START(so
, inp
, 0);
641 * Must disallow TCP ``connections'' to multicast addresses.
643 sin6p
= (struct sockaddr_in6
*)nam
;
644 if (sin6p
->sin6_family
== AF_INET6
645 && IN6_IS_ADDR_MULTICAST(&sin6p
->sin6_addr
)) {
646 error
= EAFNOSUPPORT
;
650 if (!prison_remote_ip(td
, nam
)) {
651 error
= EAFNOSUPPORT
; /* IPv4 only jail */
655 /* Reject v4-mapped address */
656 if (IN6_IS_ADDR_V4MAPPED(&sin6p
->sin6_addr
)) {
657 error
= EADDRNOTAVAIL
;
661 inp
->inp_inc
.inc_isipv6
= 1;
663 /* msg is invalid now */
666 if (msg
->connect
.nm_m
) {
667 m_freem(msg
->connect
.nm_m
);
668 msg
->connect
.nm_m
= NULL
;
670 lwkt_replymsg(&msg
->lmsg
, error
);
676 * Initiate disconnect from peer.
677 * If connection never passed embryonic stage, just drop;
678 * else if don't need to let data drain, then can just drop anyways,
679 * else have to begin TCP shutdown process: mark socket disconnecting,
680 * drain unread data, state switch to reflect user close, and
681 * send segment (e.g. FIN) to peer. Socket will be really disconnected
682 * when peer sends FIN and acks ours.
684 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
687 tcp_usr_disconnect(netmsg_t msg
)
689 struct socket
*so
= msg
->disconnect
.base
.nm_so
;
694 COMMON_START(so
, inp
, 1);
695 tp
= tcp_disconnect(tp
);
696 COMMON_END(PRU_DISCONNECT
);
700 * Accept a connection. Essentially all the work is
701 * done at higher levels; just return the address
702 * of the peer, storing through addr.
705 tcp_usr_accept(netmsg_t msg
)
707 struct socket
*so
= msg
->accept
.base
.nm_so
;
708 struct sockaddr
**nam
= msg
->accept
.nm_nam
;
711 struct tcpcb
*tp
= NULL
;
715 if (so
->so_state
& SS_ISDISCONNECTED
) {
716 error
= ECONNABORTED
;
726 in_setpeeraddr(so
, nam
);
727 COMMON_END(PRU_ACCEPT
);
732 tcp6_usr_accept(netmsg_t msg
)
734 struct socket
*so
= msg
->accept
.base
.nm_so
;
735 struct sockaddr
**nam
= msg
->accept
.nm_nam
;
738 struct tcpcb
*tp
= NULL
;
743 if (so
->so_state
& SS_ISDISCONNECTED
) {
744 error
= ECONNABORTED
;
753 in6_setpeeraddr(so
, nam
);
754 COMMON_END(PRU_ACCEPT
);
759 * Mark the connection as being incapable of further output.
762 tcp_usr_shutdown(netmsg_t msg
)
764 struct socket
*so
= msg
->shutdown
.base
.nm_so
;
769 COMMON_START(so
, inp
, 0);
771 tp
= tcp_usrclosed(tp
);
773 error
= tcp_output(tp
);
774 COMMON_END(PRU_SHUTDOWN
);
778 * After a receive, possibly send window update to peer.
781 tcp_usr_rcvd(netmsg_t msg
)
783 struct socket
*so
= msg
->rcvd
.base
.nm_so
;
784 int error
= 0, noreply
= 0;
788 COMMON_START(so
, inp
, 0);
790 if (msg
->rcvd
.nm_pru_flags
& PRUR_ASYNC
) {
792 so_async_rcvd_reply(so
);
796 COMMON_END1(PRU_RCVD
, noreply
);
800 * Do a send by putting data in output queue and updating urgent
801 * marker if URG set. Possibly send more data. Unlike the other
802 * pru_*() routines, the mbuf chains are our responsibility. We
803 * must either enqueue them or free them. The other pru_* routines
804 * generally are caller-frees.
807 tcp_usr_send(netmsg_t msg
)
809 struct socket
*so
= msg
->send
.base
.nm_so
;
810 int flags
= msg
->send
.nm_flags
;
811 struct mbuf
*m
= msg
->send
.nm_m
;
817 KKASSERT(msg
->send
.nm_control
== NULL
);
818 KKASSERT(msg
->send
.nm_addr
== NULL
);
819 KKASSERT((flags
& PRUS_FREEADDR
) == 0);
825 * OOPS! we lost a race, the TCP session got reset after
826 * we checked SS_CANTSENDMORE, eg: while doing uiomove or a
827 * network interrupt in the non-critical section of sosend().
830 error
= ECONNRESET
; /* XXX EPIPE? */
840 * This is no longer necessary, since:
841 * - sosendtcp() has already checked it for us
842 * - It does not work with asynchronized send
846 * Don't let too much OOB data build up
848 if (flags
& PRUS_OOB
) {
849 if (ssb_space(&so
->so_snd
) < -512) {
858 * Pump the data into the socket.
861 ssb_appendstream(&so
->so_snd
, m
);
864 if (flags
& PRUS_OOB
) {
866 * According to RFC961 (Assigned Protocols),
867 * the urgent pointer points to the last octet
868 * of urgent data. We continue, however,
869 * to consider it to indicate the first octet
870 * of data past the urgent section.
871 * Otherwise, snd_up should be one lower.
873 tp
->snd_up
= tp
->snd_una
+ so
->so_snd
.ssb_cc
;
874 tp
->t_flags
|= TF_FORCE
;
875 error
= tcp_output(tp
);
876 tp
->t_flags
&= ~TF_FORCE
;
878 if (flags
& PRUS_EOF
) {
880 * Close the send side of the connection after
884 tp
= tcp_usrclosed(tp
);
886 if (tp
!= NULL
&& !tcp_output_pending(tp
)) {
887 if (flags
& PRUS_MORETOCOME
)
888 tp
->t_flags
|= TF_MORETOCOME
;
889 error
= tcp_output_fair(tp
);
890 if (flags
& PRUS_MORETOCOME
)
891 tp
->t_flags
&= ~TF_MORETOCOME
;
894 COMMON_END1((flags
& PRUS_OOB
) ? PRU_SENDOOB
:
895 ((flags
& PRUS_EOF
) ? PRU_SEND_EOF
: PRU_SEND
),
896 (flags
& PRUS_NOREPLY
));
900 * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort()
901 * will sofree() it when we return.
904 tcp_usr_abort(netmsg_t msg
)
906 struct socket
*so
= msg
->abort
.base
.nm_so
;
911 COMMON_START(so
, inp
, 1);
912 tp
= tcp_drop(tp
, ECONNABORTED
);
913 COMMON_END(PRU_ABORT
);
917 * Receive out-of-band data.
920 tcp_usr_rcvoob(netmsg_t msg
)
922 struct socket
*so
= msg
->rcvoob
.base
.nm_so
;
923 struct mbuf
*m
= msg
->rcvoob
.nm_m
;
924 int flags
= msg
->rcvoob
.nm_flags
;
929 COMMON_START(so
, inp
, 0);
930 if ((so
->so_oobmark
== 0 &&
931 (so
->so_state
& SS_RCVATMARK
) == 0) ||
932 so
->so_options
& SO_OOBINLINE
||
933 tp
->t_oobflags
& TCPOOB_HADDATA
) {
937 if ((tp
->t_oobflags
& TCPOOB_HAVEDATA
) == 0) {
942 *mtod(m
, caddr_t
) = tp
->t_iobc
;
943 if ((flags
& MSG_PEEK
) == 0)
944 tp
->t_oobflags
^= (TCPOOB_HAVEDATA
| TCPOOB_HADDATA
);
945 COMMON_END(PRU_RCVOOB
);
949 tcp_usr_savefaddr(struct socket
*so
, const struct sockaddr
*faddr
)
951 in_savefaddr(so
, faddr
);
956 tcp6_usr_savefaddr(struct socket
*so
, const struct sockaddr
*faddr
)
958 in6_savefaddr(so
, faddr
);
963 tcp_usr_preconnect(struct socket
*so
, const struct sockaddr
*nam
,
964 struct thread
*td __unused
)
966 const struct sockaddr_in
*sinp
;
968 sinp
= (const struct sockaddr_in
*)nam
;
969 if (sinp
->sin_family
== AF_INET
&&
970 IN_MULTICAST(ntohl(sinp
->sin_addr
.s_addr
)))
977 /* xxx - should be const */
978 struct pr_usrreqs tcp_usrreqs
= {
979 .pru_abort
= tcp_usr_abort
,
980 .pru_accept
= tcp_usr_accept
,
981 .pru_attach
= tcp_usr_attach
,
982 .pru_bind
= tcp_usr_bind
,
983 .pru_connect
= tcp_usr_connect
,
984 .pru_connect2
= pr_generic_notsupp
,
985 .pru_control
= in_control_dispatch
,
986 .pru_detach
= tcp_usr_detach
,
987 .pru_disconnect
= tcp_usr_disconnect
,
988 .pru_listen
= tcp_usr_listen
,
989 .pru_peeraddr
= in_setpeeraddr_dispatch
,
990 .pru_rcvd
= tcp_usr_rcvd
,
991 .pru_rcvoob
= tcp_usr_rcvoob
,
992 .pru_send
= tcp_usr_send
,
993 .pru_sense
= pru_sense_null
,
994 .pru_shutdown
= tcp_usr_shutdown
,
995 .pru_sockaddr
= in_setsockaddr_dispatch
,
996 .pru_sosend
= sosendtcp
,
997 .pru_soreceive
= sorecvtcp
,
998 .pru_savefaddr
= tcp_usr_savefaddr
,
999 .pru_preconnect
= tcp_usr_preconnect
,
1000 .pru_preattach
= tcp_usr_preattach
1004 struct pr_usrreqs tcp6_usrreqs
= {
1005 .pru_abort
= tcp_usr_abort
,
1006 .pru_accept
= tcp6_usr_accept
,
1007 .pru_attach
= tcp_usr_attach
,
1008 .pru_bind
= tcp6_usr_bind
,
1009 .pru_connect
= tcp6_usr_connect
,
1010 .pru_connect2
= pr_generic_notsupp
,
1011 .pru_control
= in6_control_dispatch
,
1012 .pru_detach
= tcp_usr_detach
,
1013 .pru_disconnect
= tcp_usr_disconnect
,
1014 .pru_listen
= tcp6_usr_listen
,
1015 .pru_peeraddr
= in6_setpeeraddr_dispatch
,
1016 .pru_rcvd
= tcp_usr_rcvd
,
1017 .pru_rcvoob
= tcp_usr_rcvoob
,
1018 .pru_send
= tcp_usr_send
,
1019 .pru_sense
= pru_sense_null
,
1020 .pru_shutdown
= tcp_usr_shutdown
,
1021 .pru_sockaddr
= in6_setsockaddr_dispatch
,
1022 .pru_sosend
= sosendtcp
,
1023 .pru_soreceive
= sorecvtcp
,
1024 .pru_savefaddr
= tcp6_usr_savefaddr
1029 tcp_connect_oncpu(struct tcpcb
*tp
, int flags
, struct mbuf
*m
,
1030 struct sockaddr_in
*sin
, struct sockaddr_in
*if_sin
)
1032 struct inpcb
*inp
= tp
->t_inpcb
, *oinp
;
1033 struct socket
*so
= inp
->inp_socket
;
1034 struct route
*ro
= &inp
->inp_route
;
1036 KASSERT(inp
->inp_pcbinfo
== &tcbinfo
[mycpu
->gd_cpuid
],
1037 ("pcbinfo mismatch"));
1039 oinp
= in_pcblookup_hash(inp
->inp_pcbinfo
,
1040 sin
->sin_addr
, sin
->sin_port
,
1041 (inp
->inp_laddr
.s_addr
!= INADDR_ANY
?
1042 inp
->inp_laddr
: if_sin
->sin_addr
),
1043 inp
->inp_lport
, 0, NULL
);
1046 return (EADDRINUSE
);
1048 if (inp
->inp_laddr
.s_addr
== INADDR_ANY
)
1049 inp
->inp_laddr
= if_sin
->sin_addr
;
1050 inp
->inp_faddr
= sin
->sin_addr
;
1051 inp
->inp_fport
= sin
->sin_port
;
1052 in_pcbinsconnhash(inp
);
1055 * We are now on the inpcb's owner CPU, if the cached route was
1056 * freed because the rtentry's owner CPU is not the current CPU
1057 * (e.g. in tcp_connect()), then we try to reallocate it here with
1058 * the hope that a rtentry may be cloned from a RTF_PRCLONING
1061 if (!(inp
->inp_socket
->so_options
& SO_DONTROUTE
) && /*XXX*/
1062 ro
->ro_rt
== NULL
) {
1063 bzero(&ro
->ro_dst
, sizeof(struct sockaddr_in
));
1064 ro
->ro_dst
.sa_family
= AF_INET
;
1065 ro
->ro_dst
.sa_len
= sizeof(struct sockaddr_in
);
1066 ((struct sockaddr_in
*)&ro
->ro_dst
)->sin_addr
=
1072 * Now that no more errors can occur, change the protocol processing
1073 * port to the current thread (which is the correct thread).
1075 * Create TCP timer message now; we are on the tcpcb's owner
1078 tcp_create_timermsg(tp
, &curthread
->td_msgport
);
1081 * Compute window scaling to request. Use a larger scaling then
1082 * needed for the initial receive buffer in case the receive buffer
1085 if (tp
->request_r_scale
< TCP_MIN_WINSHIFT
)
1086 tp
->request_r_scale
= TCP_MIN_WINSHIFT
;
1087 while (tp
->request_r_scale
< TCP_MAX_WINSHIFT
&&
1088 (TCP_MAXWIN
<< tp
->request_r_scale
) < so
->so_rcv
.ssb_hiwat
1090 tp
->request_r_scale
++;
1094 tcpstat
.tcps_connattempt
++;
1095 TCP_STATE_CHANGE(tp
, TCPS_SYN_SENT
);
1096 tcp_callout_reset(tp
, tp
->tt_keep
, tp
->t_keepinit
, tcp_timer_keep
);
1097 tp
->iss
= tcp_new_isn(tp
);
1098 tcp_sendseqinit(tp
);
1100 ssb_appendstream(&so
->so_snd
, m
);
1102 if (flags
& PRUS_OOB
)
1103 tp
->snd_up
= tp
->snd_una
+ so
->so_snd
.ssb_cc
;
1107 * Close the send side of the connection after
1108 * the data is sent if flagged.
1110 if ((flags
& (PRUS_OOB
|PRUS_EOF
)) == PRUS_EOF
) {
1112 tp
= tcp_usrclosed(tp
);
1114 return (tcp_output(tp
));
1118 * Common subroutine to open a TCP connection to remote host specified
1119 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local
1120 * port number if needed. Call in_pcbladdr to do the routing and to choose
1121 * a local host address (interface).
1122 * Initialize connection parameters and enter SYN-SENT state.
1125 tcp_connect(netmsg_t msg
)
1127 struct socket
*so
= msg
->connect
.base
.nm_so
;
1128 struct sockaddr
*nam
= msg
->connect
.nm_nam
;
1129 struct thread
*td
= msg
->connect
.nm_td
;
1130 struct sockaddr_in
*sin
= (struct sockaddr_in
*)nam
;
1131 struct sockaddr_in
*if_sin
= NULL
;
1137 COMMON_START(so
, inp
, 0);
1140 * Reconnect our pcb if we have to
1142 if (msg
->connect
.nm_flags
& PRUC_RECONNECT
) {
1143 msg
->connect
.nm_flags
&= ~PRUC_RECONNECT
;
1144 TCP_STATE_MIGRATE_END(tp
);
1145 in_pcblink(so
->so_pcb
, &tcbinfo
[mycpu
->gd_cpuid
]);
1149 * Bind if we have to
1151 if (inp
->inp_lport
== 0) {
1152 if (tcp_lport_extension
) {
1153 KKASSERT(inp
->inp_laddr
.s_addr
== INADDR_ANY
);
1155 error
= in_pcbladdr(inp
, nam
, &if_sin
, td
);
1158 inp
->inp_laddr
.s_addr
= if_sin
->sin_addr
.s_addr
;
1160 error
= in_pcbbind_remote(inp
, nam
, td
);
1164 msg
->connect
.nm_flags
|= PRUC_HASLADDR
;
1166 error
= in_pcbbind(inp
, NULL
, td
);
1172 if ((msg
->connect
.nm_flags
& PRUC_HASLADDR
) == 0) {
1174 * Calculate the correct protocol processing thread. The
1175 * connect operation must run there. Set the forwarding
1176 * port before we forward the message or it will get bounced
1179 error
= in_pcbladdr(inp
, nam
, &if_sin
, td
);
1183 KKASSERT(inp
->inp_socket
== so
);
1185 port
= tcp_addrport(sin
->sin_addr
.s_addr
, sin
->sin_port
,
1186 (inp
->inp_laddr
.s_addr
!= INADDR_ANY
?
1187 inp
->inp_laddr
.s_addr
: if_sin
->sin_addr
.s_addr
),
1190 if (port
!= &curthread
->td_msgport
) {
1191 lwkt_msg_t lmsg
= &msg
->connect
.base
.lmsg
;
1194 * in_pcbladdr() may have allocated a route entry for us
1195 * on the current CPU, but we need a route entry on the
1196 * inpcb's owner CPU, so free it here.
1198 in_pcbresetroute(inp
);
1201 * We are moving the protocol processing port the socket
1202 * is on, we have to unlink here and re-link on the
1205 in_pcbunlink(so
->so_pcb
, &tcbinfo
[mycpu
->gd_cpuid
]);
1206 msg
->connect
.nm_flags
|= PRUC_RECONNECT
;
1207 msg
->connect
.base
.nm_dispatch
= tcp_connect
;
1209 TCP_STATE_MIGRATE_START(tp
);
1212 * Use message put done receipt to change this socket's
1213 * so_port, i.e. _after_ this message was put onto the
1214 * target netisr's msgport but _before_ the message could
1215 * be pulled from the target netisr's msgport, so that:
1216 * - The upper half (socket code) will not see the new
1217 * msgport before this message reaches the new msgport
1218 * and messages for this socket will be ordered.
1219 * - This message will see the new msgport, when its
1220 * handler is called in the target netisr.
1223 * We MUST use messege put done receipt to change this
1225 * If we changed the so_port in this netisr after the
1226 * lwkt_forwardmsg (so messages for this socket will be
1227 * ordered) and changed the so_port in the target netisr
1228 * at the very beginning of this message's handler, we
1229 * would suffer so_port overwritten race, given this
1230 * message might be forwarded again.
1233 * This mechanism depends on that the netisr's msgport
1234 * is spin msgport (currently it is :).
1236 * If the upper half saw the new msgport before this
1237 * message reached the target netisr's msgport, the
1238 * messages sent from the upper half could reach the new
1239 * msgport before this message, thus there would be
1240 * message reordering. The worst case could be soclose()
1241 * saw the new msgport and the detach message could reach
1242 * the new msgport before this message, i.e. the inpcb
1243 * could have been destroyed when this message was still
1244 * pending on or on its way to the new msgport. Other
1245 * weird cases could also happen, e.g. inpcb->inp_pcbinfo,
1246 * since we have unlinked this inpcb from the current
1249 lwkt_setmsg_receipt(lmsg
, tcp_sosetport
);
1250 lwkt_forwardmsg(port
, lmsg
);
1251 /* msg invalid now */
1253 } else if (msg
->connect
.nm_flags
& PRUC_HELDTD
) {
1255 * The original thread is no longer needed; release it.
1258 msg
->connect
.nm_flags
&= ~PRUC_HELDTD
;
1260 error
= tcp_connect_oncpu(tp
, msg
->connect
.nm_sndflags
,
1261 msg
->connect
.nm_m
, sin
, if_sin
);
1262 msg
->connect
.nm_m
= NULL
;
1264 if (msg
->connect
.nm_m
) {
1265 m_freem(msg
->connect
.nm_m
);
1266 msg
->connect
.nm_m
= NULL
;
1268 if (msg
->connect
.nm_flags
& PRUC_HELDTD
)
1270 if (error
&& (msg
->connect
.nm_flags
& PRUC_ASYNC
)) {
1271 so
->so_error
= error
;
1272 soisdisconnected(so
);
1274 lwkt_replymsg(&msg
->connect
.base
.lmsg
, error
);
1275 /* msg invalid now */
1281 tcp6_connect(netmsg_t msg
)
1284 struct socket
*so
= msg
->connect
.base
.nm_so
;
1285 struct sockaddr
*nam
= msg
->connect
.nm_nam
;
1286 struct thread
*td
= msg
->connect
.nm_td
;
1288 struct sockaddr_in6
*sin6
= (struct sockaddr_in6
*)nam
;
1289 struct in6_addr
*addr6
;
1293 COMMON_START(so
, inp
, 0);
1296 * Reconnect our pcb if we have to
1298 if (msg
->connect
.nm_flags
& PRUC_RECONNECT
) {
1299 msg
->connect
.nm_flags
&= ~PRUC_RECONNECT
;
1300 TCP_STATE_MIGRATE_END(tp
);
1301 in_pcblink(so
->so_pcb
, &tcbinfo
[mycpu
->gd_cpuid
]);
1305 * Bind if we have to
1307 if (inp
->inp_lport
== 0) {
1308 error
= in6_pcbbind(inp
, NULL
, td
);
1314 * Cannot simply call in_pcbconnect, because there might be an
1315 * earlier incarnation of this same connection still in
1316 * TIME_WAIT state, creating an ADDRINUSE error.
1318 error
= in6_pcbladdr(inp
, nam
, &addr6
, td
);
1322 port
= tcp6_addrport(); /* XXX hack for now, always cpu0 */
1324 if (port
!= &curthread
->td_msgport
) {
1325 lwkt_msg_t lmsg
= &msg
->connect
.base
.lmsg
;
1328 * in_pcbladdr() may have allocated a route entry for us
1329 * on the current CPU, but we need a route entry on the
1330 * inpcb's owner CPU, so free it here.
1332 in_pcbresetroute(inp
);
1334 in_pcbunlink(so
->so_pcb
, &tcbinfo
[mycpu
->gd_cpuid
]);
1335 msg
->connect
.nm_flags
|= PRUC_RECONNECT
;
1336 msg
->connect
.base
.nm_dispatch
= tcp6_connect
;
1338 TCP_STATE_MIGRATE_START(tp
);
1340 /* See the related comment in tcp_connect() */
1341 lwkt_setmsg_receipt(lmsg
, tcp_sosetport
);
1342 lwkt_forwardmsg(port
, lmsg
);
1343 /* msg invalid now */
1346 error
= tcp6_connect_oncpu(tp
, msg
->connect
.nm_sndflags
,
1347 &msg
->connect
.nm_m
, sin6
, addr6
);
1348 /* nm_m may still be intact */
1350 if (msg
->connect
.nm_m
) {
1351 m_freem(msg
->connect
.nm_m
);
1352 msg
->connect
.nm_m
= NULL
;
1354 lwkt_replymsg(&msg
->connect
.base
.lmsg
, error
);
1355 /* msg invalid now */
1359 tcp6_connect_oncpu(struct tcpcb
*tp
, int flags
, struct mbuf
**mp
,
1360 struct sockaddr_in6
*sin6
, struct in6_addr
*addr6
)
1362 struct mbuf
*m
= *mp
;
1363 struct inpcb
*inp
= tp
->t_inpcb
;
1364 struct socket
*so
= inp
->inp_socket
;
1368 * Cannot simply call in_pcbconnect, because there might be an
1369 * earlier incarnation of this same connection still in
1370 * TIME_WAIT state, creating an ADDRINUSE error.
1372 oinp
= in6_pcblookup_hash(inp
->inp_pcbinfo
,
1373 &sin6
->sin6_addr
, sin6
->sin6_port
,
1374 (IN6_IS_ADDR_UNSPECIFIED(&inp
->in6p_laddr
) ?
1375 addr6
: &inp
->in6p_laddr
),
1376 inp
->inp_lport
, 0, NULL
);
1378 return (EADDRINUSE
);
1380 if (IN6_IS_ADDR_UNSPECIFIED(&inp
->in6p_laddr
))
1381 inp
->in6p_laddr
= *addr6
;
1382 inp
->in6p_faddr
= sin6
->sin6_addr
;
1383 inp
->inp_fport
= sin6
->sin6_port
;
1384 if ((sin6
->sin6_flowinfo
& IPV6_FLOWINFO_MASK
) != 0)
1385 inp
->in6p_flowinfo
= sin6
->sin6_flowinfo
;
1386 in_pcbinsconnhash(inp
);
1389 * Now that no more errors can occur, change the protocol processing
1390 * port to the current thread (which is the correct thread).
1392 * Create TCP timer message now; we are on the tcpcb's owner
1395 tcp_create_timermsg(tp
, &curthread
->td_msgport
);
1397 /* Compute window scaling to request. */
1398 if (tp
->request_r_scale
< TCP_MIN_WINSHIFT
)
1399 tp
->request_r_scale
= TCP_MIN_WINSHIFT
;
1400 while (tp
->request_r_scale
< TCP_MAX_WINSHIFT
&&
1401 (TCP_MAXWIN
<< tp
->request_r_scale
) < so
->so_rcv
.ssb_hiwat
) {
1402 tp
->request_r_scale
++;
1406 tcpstat
.tcps_connattempt
++;
1407 TCP_STATE_CHANGE(tp
, TCPS_SYN_SENT
);
1408 tcp_callout_reset(tp
, tp
->tt_keep
, tp
->t_keepinit
, tcp_timer_keep
);
1409 tp
->iss
= tcp_new_isn(tp
);
1410 tcp_sendseqinit(tp
);
1412 ssb_appendstream(&so
->so_snd
, m
);
1414 if (flags
& PRUS_OOB
)
1415 tp
->snd_up
= tp
->snd_una
+ so
->so_snd
.ssb_cc
;
1419 * Close the send side of the connection after
1420 * the data is sent if flagged.
1422 if ((flags
& (PRUS_OOB
|PRUS_EOF
)) == PRUS_EOF
) {
1424 tp
= tcp_usrclosed(tp
);
1426 return (tcp_output(tp
));
1432 * The new sockopt interface makes it possible for us to block in the
1433 * copyin/out step (if we take a page fault). Taking a page fault while
1434 * in a critical section is probably a Bad Thing. (Since sockets and pcbs
1435 * both now use TSM, there probably isn't any need for this function to
1436 * run in a critical section any more. This needs more examination.)
1439 tcp_ctloutput(netmsg_t msg
)
1441 struct socket
*so
= msg
->base
.nm_so
;
1442 struct sockopt
*sopt
= msg
->ctloutput
.nm_sopt
;
1443 struct thread
*td
= NULL
;
1444 int error
, opt
, optval
, opthz
;
1448 if (msg
->ctloutput
.nm_flags
& PRCO_HELDTD
)
1457 tp
= intotcpcb(inp
);
1459 /* Get socket's owner cpuid hint */
1460 if (sopt
->sopt_level
== SOL_SOCKET
&&
1461 sopt
->sopt_dir
== SOPT_GET
&&
1462 sopt
->sopt_name
== SO_CPUHINT
) {
1463 if (tp
->t_flags
& TF_LISTEN
) {
1465 * Listen sockets owner cpuid is always 0,
1466 * which does not make sense if SO_REUSEPORT
1469 if (so
->so_options
& SO_REUSEPORT
)
1470 optval
= (inp
->inp_lgrpindex
& ncpus2_mask
);
1472 optval
= -1; /* no hint */
1476 soopt_from_kbuf(sopt
, &optval
, sizeof(optval
));
1480 if (sopt
->sopt_level
!= IPPROTO_TCP
) {
1481 if (sopt
->sopt_level
== IPPROTO_IP
) {
1482 switch (sopt
->sopt_name
) {
1483 case IP_MULTICAST_IF
:
1484 case IP_MULTICAST_VIF
:
1485 case IP_MULTICAST_TTL
:
1486 case IP_MULTICAST_LOOP
:
1487 case IP_ADD_MEMBERSHIP
:
1488 case IP_DROP_MEMBERSHIP
:
1490 * Multicast does not make sense on
1498 if (INP_CHECK_SOCKAF(so
, AF_INET6
))
1499 ip6_ctloutput_dispatch(msg
);
1503 /* msg invalid now */
1509 switch (sopt
->sopt_dir
) {
1511 error
= soopt_to_kbuf(sopt
, &optval
, sizeof optval
,
1515 switch (sopt
->sopt_name
) {
1518 tp
->t_keepidle
= tp
->t_keepintvl
;
1520 tp
->t_keepidle
= tcp_keepidle
;
1521 tcp_timer_keep_activity(tp
, 0);
1523 #ifdef TCP_SIGNATURE
1524 case TCP_SIGNATURE_ENABLE
:
1525 if (tp
->t_state
== TCPS_CLOSED
) {
1527 * This is the only safe state that this
1528 * option could be changed. Some segments
1529 * could already have been sent in other
1533 tp
->t_flags
|= TF_SIGNATURE
;
1535 tp
->t_flags
&= ~TF_SIGNATURE
;
1540 #endif /* TCP_SIGNATURE */
1543 switch (sopt
->sopt_name
) {
1551 opt
= 0; /* dead code to fool gcc */
1558 tp
->t_flags
&= ~opt
;
1562 if (tcp_disable_nopush
)
1565 tp
->t_flags
|= TF_NOPUSH
;
1567 tp
->t_flags
&= ~TF_NOPUSH
;
1568 error
= tcp_output(tp
);
1574 * Must be between 0 and maxseg. If the requested
1575 * maxseg is too small to satisfy the desired minmss,
1576 * pump it up (silently so sysctl modifications of
1577 * minmss do not create unexpected program failures).
1578 * Handle degenerate cases.
1580 if (optval
> 0 && optval
<= tp
->t_maxseg
) {
1581 if (optval
+ 40 < tcp_minmss
) {
1582 optval
= tcp_minmss
- 40;
1586 tp
->t_maxseg
= optval
;
1593 opthz
= ((int64_t)optval
* hz
) / 1000;
1595 tp
->t_keepinit
= opthz
;
1601 opthz
= ((int64_t)optval
* hz
) / 1000;
1603 tp
->t_keepidle
= opthz
;
1604 tcp_timer_keep_activity(tp
, 0);
1611 opthz
= ((int64_t)optval
* hz
) / 1000;
1613 tp
->t_keepintvl
= opthz
;
1614 tp
->t_maxidle
= tp
->t_keepintvl
* tp
->t_keepcnt
;
1622 tp
->t_keepcnt
= optval
;
1623 tp
->t_maxidle
= tp
->t_keepintvl
* tp
->t_keepcnt
;
1630 error
= ENOPROTOOPT
;
1636 switch (sopt
->sopt_name
) {
1637 #ifdef TCP_SIGNATURE
1638 case TCP_SIGNATURE_ENABLE
:
1639 optval
= (tp
->t_flags
& TF_SIGNATURE
) ? 1 : 0;
1641 #endif /* TCP_SIGNATURE */
1643 optval
= tp
->t_flags
& TF_NODELAY
;
1646 optval
= tp
->t_maxseg
;
1649 optval
= tp
->t_flags
& TF_NOOPT
;
1652 optval
= tp
->t_flags
& TF_NOPUSH
;
1655 optval
= ((int64_t)tp
->t_keepinit
* 1000) / hz
;
1658 optval
= ((int64_t)tp
->t_keepidle
* 1000) / hz
;
1661 optval
= ((int64_t)tp
->t_keepintvl
* 1000) / hz
;
1664 optval
= tp
->t_keepcnt
;
1667 error
= ENOPROTOOPT
;
1671 soopt_from_kbuf(sopt
, &optval
, sizeof optval
);
1677 lwkt_replymsg(&msg
->lmsg
, error
);
1680 struct netmsg_tcp_ctloutput
{
1681 struct netmsg_pr_ctloutput ctloutput
;
1682 struct sockopt sopt
;
1687 * Allocate netmsg_pr_ctloutput for asynchronous tcp_ctloutput.
1689 struct netmsg_pr_ctloutput
*
1690 tcp_ctloutmsg(struct sockopt
*sopt
)
1692 struct netmsg_tcp_ctloutput
*msg
;
1693 int flags
= 0, error
;
1695 KASSERT(sopt
->sopt_dir
== SOPT_SET
, ("not from ctloutput"));
1697 /* Only small set of options allows asynchronous setting. */
1698 if (sopt
->sopt_level
!= IPPROTO_TCP
)
1700 switch (sopt
->sopt_name
) {
1710 msg
= kmalloc(sizeof(*msg
), M_LWKTMSG
, M_WAITOK
| M_NULLOK
);
1712 /* Fallback to synchronous tcp_ctloutput */
1716 /* Save the sockopt */
1719 /* Fixup the sopt.sopt_val ptr */
1720 error
= sooptcopyin(sopt
, &msg
->sopt_val
,
1721 sizeof(msg
->sopt_val
), sizeof(msg
->sopt_val
));
1723 kfree(msg
, M_LWKTMSG
);
1726 msg
->sopt
.sopt_val
= &msg
->sopt_val
;
1728 /* Hold the current thread */
1729 if (msg
->sopt
.sopt_td
!= NULL
) {
1730 flags
|= PRCO_HELDTD
;
1731 lwkt_hold(msg
->sopt
.sopt_td
);
1734 msg
->ctloutput
.nm_flags
= flags
;
1735 msg
->ctloutput
.nm_sopt
= &msg
->sopt
;
1737 return &msg
->ctloutput
;
1741 * tcp_sendspace and tcp_recvspace are the default send and receive window
1742 * sizes, respectively. These are obsolescent (this information should
1743 * be set by the route).
1745 * Use a default that does not require tcp window scaling to be turned
1746 * on. Individual programs or the administrator can increase the default.
1748 u_long tcp_sendspace
= 57344; /* largest multiple of PAGE_SIZE < 64k */
1749 SYSCTL_INT(_net_inet_tcp
, TCPCTL_SENDSPACE
, sendspace
, CTLFLAG_RW
,
1750 &tcp_sendspace
, 0, "Maximum outgoing TCP datagram size");
1751 u_long tcp_recvspace
= 57344; /* largest multiple of PAGE_SIZE < 64k */
1752 SYSCTL_INT(_net_inet_tcp
, TCPCTL_RECVSPACE
, recvspace
, CTLFLAG_RW
,
1753 &tcp_recvspace
, 0, "Maximum incoming TCP datagram size");
1756 * Attach TCP protocol to socket, allocating internet protocol control
1757 * block, tcp control block, buffer space, and entering CLOSED state.
1760 tcp_attach(struct socket
*so
, struct pru_attach_info
*ai
)
1766 boolean_t isipv6
= INP_CHECK_SOCKAF(so
, AF_INET6
);
1770 error
= tcp_usr_preattach(so
, 0 /* don't care */, ai
);
1774 /* Post attach; do nothing */
1777 cpu
= mycpu
->gd_cpuid
;
1780 * Set the default pcbinfo. This will likely change when we
1783 error
= in_pcballoc(so
, &tcbinfo
[cpu
]);
1789 inp
->in6p_hops
= -1; /* use kernel default */
1792 /* Keep a reference for asynchronized pru_rcvd */
1798 * Initiate (or continue) disconnect.
1799 * If embryonic state, just send reset (once).
1800 * If in ``let data drain'' option and linger null, just drop.
1801 * Otherwise (hard), mark socket disconnecting and drop
1802 * current input data; switch states based on user close, and
1803 * send segment to peer (with FIN).
1805 static struct tcpcb
*
1806 tcp_disconnect(struct tcpcb
*tp
)
1808 struct socket
*so
= tp
->t_inpcb
->inp_socket
;
1810 if (tp
->t_state
< TCPS_ESTABLISHED
) {
1812 } else if ((so
->so_options
& SO_LINGER
) && so
->so_linger
== 0) {
1813 tp
= tcp_drop(tp
, 0);
1815 lwkt_gettoken(&so
->so_rcv
.ssb_token
);
1816 soisdisconnecting(so
);
1817 sbflush(&so
->so_rcv
.sb
);
1818 tp
= tcp_usrclosed(tp
);
1821 lwkt_reltoken(&so
->so_rcv
.ssb_token
);
1827 * User issued close, and wish to trail through shutdown states:
1828 * if never received SYN, just forget it. If got a SYN from peer,
1829 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
1830 * If already got a FIN from peer, then almost done; go to LAST_ACK
1831 * state. In all other cases, have already sent FIN to peer (e.g.
1832 * after PRU_SHUTDOWN), and just have to play tedious game waiting
1833 * for peer to send FIN or not respond to keep-alives, etc.
1834 * We can let the user exit from the close as soon as the FIN is acked.
1836 static struct tcpcb
*
1837 tcp_usrclosed(struct tcpcb
*tp
)
1840 switch (tp
->t_state
) {
1844 TCP_STATE_CHANGE(tp
, TCPS_CLOSED
);
1849 case TCPS_SYN_RECEIVED
:
1850 tp
->t_flags
|= TF_NEEDFIN
;
1853 case TCPS_ESTABLISHED
:
1854 TCP_STATE_CHANGE(tp
, TCPS_FIN_WAIT_1
);
1857 case TCPS_CLOSE_WAIT
:
1858 TCP_STATE_CHANGE(tp
, TCPS_LAST_ACK
);
1861 if (tp
&& tp
->t_state
>= TCPS_FIN_WAIT_2
) {
1862 soisdisconnected(tp
->t_inpcb
->inp_socket
);
1863 /* To prevent the connection hanging in FIN_WAIT_2 forever. */
1864 if (tp
->t_state
== TCPS_FIN_WAIT_2
) {
1865 tcp_callout_reset(tp
, tp
->tt_2msl
, tp
->t_maxidle
,