kernel: Make SMP support default (and non-optional).
[dragonfly.git] / sys / netinet / tcp_usrreq.c
CommitLineData
984263bc 1/*
66d6c637
JH
2 * Copyright (c) 2003, 2004 Jeffrey M. Hsu. All rights reserved.
3 * Copyright (c) 2003, 2004 The DragonFly Project. All rights reserved.
f23061d4 4 *
66d6c637
JH
5 * This code is derived from software contributed to The DragonFly Project
6 * by Jeffrey M. Hsu.
f23061d4 7 *
66d6c637
JH
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
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.
f23061d4 19 *
66d6c637
JH
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
31 * SUCH DAMAGE.
32 */
33
66d6c637 34/*
984263bc
MD
35 * Copyright (c) 1982, 1986, 1988, 1993
36 * The Regents of the University of California. All rights reserved.
37 *
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
40 * are met:
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. All advertising materials mentioning features or use of this software
47 * must display the following acknowledgement:
48 * This product includes software developed by the University of
49 * California, Berkeley and its contributors.
50 * 4. Neither the name of the University nor the names of its contributors
51 * may be used to endorse or promote products derived from this software
52 * without specific prior written permission.
53 *
54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
64 * SUCH DAMAGE.
65 *
66 * From: @(#)tcp_usrreq.c 8.2 (Berkeley) 1/3/94
67 * $FreeBSD: src/sys/netinet/tcp_usrreq.c,v 1.51.2.17 2002/10/11 11:46:44 ume Exp $
68 */
69
70#include "opt_ipsec.h"
b1992928 71#include "opt_inet.h"
984263bc
MD
72#include "opt_inet6.h"
73#include "opt_tcpdebug.h"
74
75#include <sys/param.h>
76#include <sys/systm.h>
77#include <sys/kernel.h>
7fe56515 78#include <sys/malloc.h>
984263bc 79#include <sys/sysctl.h>
d371a63a
JH
80#include <sys/globaldata.h>
81#include <sys/thread.h>
82
984263bc
MD
83#include <sys/mbuf.h>
84#ifdef INET6
85#include <sys/domain.h>
86#endif /* INET6 */
87#include <sys/socket.h>
88#include <sys/socketvar.h>
96c6eb29 89#include <sys/socketops.h>
984263bc
MD
90#include <sys/protosw.h>
91
1cae611f 92#include <sys/thread2.h>
7fe56515 93#include <sys/msgport2.h>
6cef7136 94#include <sys/socketvar2.h>
7fe56515 95
984263bc 96#include <net/if.h>
7fe56515 97#include <net/netisr.h>
984263bc
MD
98#include <net/route.h>
99
4599cf19
MD
100#include <net/netmsg2.h>
101
984263bc
MD
102#include <netinet/in.h>
103#include <netinet/in_systm.h>
104#ifdef INET6
105#include <netinet/ip6.h>
106#endif
107#include <netinet/in_pcb.h>
108#ifdef INET6
109#include <netinet6/in6_pcb.h>
110#endif
111#include <netinet/in_var.h>
112#include <netinet/ip_var.h>
113#ifdef INET6
114#include <netinet6/ip6_var.h>
65f3e756 115#include <netinet6/tcp6_var.h>
984263bc
MD
116#endif
117#include <netinet/tcp.h>
118#include <netinet/tcp_fsm.h>
119#include <netinet/tcp_seq.h>
120#include <netinet/tcp_timer.h>
a48c5dd5 121#include <netinet/tcp_timer2.h>
984263bc
MD
122#include <netinet/tcp_var.h>
123#include <netinet/tcpip.h>
124#ifdef TCPDEBUG
125#include <netinet/tcp_debug.h>
126#endif
127
128#ifdef IPSEC
129#include <netinet6/ipsec.h>
130#endif /*IPSEC*/
131
132/*
133 * TCP protocol interface to socket abstraction.
134 */
135extern char *tcpstates[]; /* XXX ??? */
136
e4700d00 137static int tcp_attach (struct socket *, struct pru_attach_info *);
002c1265 138static void tcp_connect (netmsg_t msg);
984263bc 139#ifdef INET6
002c1265
MD
140static void tcp6_connect (netmsg_t msg);
141static int tcp6_connect_oncpu(struct tcpcb *tp, int flags,
142 struct mbuf **mp,
48e7b118 143 struct sockaddr_in6 *sin6,
65f3e756 144 struct in6_addr *addr6);
984263bc
MD
145#endif /* INET6 */
146static struct tcpcb *
42a7fc75 147 tcp_disconnect (struct tcpcb *);
984263bc 148static struct tcpcb *
42a7fc75 149 tcp_usrclosed (struct tcpcb *);
984263bc
MD
150
151#ifdef TCPDEBUG
152#define TCPDEBUG0 int ostate = 0
153#define TCPDEBUG1() ostate = tp ? tp->t_state : 0
154#define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \
155 tcp_trace(TA_USER, ostate, tp, 0, 0, req)
156#else
157#define TCPDEBUG0
158#define TCPDEBUG1()
159#define TCPDEBUG2(req)
160#endif
161
f12e9fad 162static int tcp_lport_extension = 1;
db26865d
SZ
163SYSCTL_INT(_net_inet_tcp, OID_AUTO, lportext, CTLFLAG_RW,
164 &tcp_lport_extension, 0, "");
165
3533a183
SZ
166/*
167 * For some ill optimized programs, which try to use TCP_NOPUSH
168 * to improve performance, will have small amount of data sits
169 * in the sending buffer. These small amount of data will _not_
170 * be pushed into the network until more data are written into
171 * the socket or the socket write side is shutdown.
172 */
173static int tcp_disable_nopush = 1;
174SYSCTL_INT(_net_inet_tcp, OID_AUTO, disable_nopush, CTLFLAG_RW,
175 &tcp_disable_nopush, 0, "TCP_NOPUSH socket option will have no effect");
176
984263bc
MD
177/*
178 * TCP attaches to socket via pru_attach(), reserving space,
0ce0603e
MD
179 * and an internet control block. This is likely occuring on
180 * cpu0 and may have to move later when we bind/connect.
984263bc 181 */
002c1265
MD
182static void
183tcp_usr_attach(netmsg_t msg)
984263bc 184{
002c1265
MD
185 struct socket *so = msg->base.nm_so;
186 struct pru_attach_info *ai = msg->attach.nm_ai;
984263bc 187 int error;
1cae611f 188 struct inpcb *inp;
4090d6ff 189 struct tcpcb *tp = NULL;
984263bc
MD
190 TCPDEBUG0;
191
6cef7136 192 soreference(so);
1cae611f 193 inp = so->so_pcb;
984263bc
MD
194 TCPDEBUG1();
195 if (inp) {
196 error = EISCONN;
197 goto out;
198 }
199
e4700d00 200 error = tcp_attach(so, ai);
984263bc
MD
201 if (error)
202 goto out;
203
204 if ((so->so_options & SO_LINGER) && so->so_linger == 0)
205 so->so_linger = TCP_LINGERTIME;
206 tp = sototcpcb(so);
207out:
6cef7136 208 sofree(so); /* from ref above */
984263bc 209 TCPDEBUG2(PRU_ATTACH);
002c1265 210 lwkt_replymsg(&msg->lmsg, error);
984263bc
MD
211}
212
213/*
214 * pru_detach() detaches the TCP protocol from the socket.
215 * If the protocol state is non-embryonic, then can't
216 * do this directly: have to initiate a pru_disconnect(),
217 * which may finish later; embryonic TCB's can just
218 * be discarded here.
219 */
002c1265
MD
220static void
221tcp_usr_detach(netmsg_t msg)
984263bc 222{
002c1265 223 struct socket *so = msg->base.nm_so;
984263bc 224 int error = 0;
1cae611f 225 struct inpcb *inp;
984263bc
MD
226 struct tcpcb *tp;
227 TCPDEBUG0;
228
1cae611f 229 inp = so->so_pcb;
69891757
MD
230
231 /*
232 * If the inp is already detached it may have been due to an async
233 * close. Just return as if no error occured.
002c1265 234 *
621989fd
MD
235 * It's possible for the tcpcb (tp) to disconnect from the inp due
236 * to tcp_drop()->tcp_close() being called. This may occur *after*
237 * the detach message has been queued so we may find a NULL tp here.
238 */
002c1265
MD
239 if (inp) {
240 if ((tp = intotcpcb(inp)) != NULL) {
241 TCPDEBUG1();
242 tp = tcp_disconnect(tp);
243 TCPDEBUG2(PRU_DETACH);
244 }
621989fd 245 }
002c1265 246 lwkt_replymsg(&msg->lmsg, error);
984263bc
MD
247}
248
69891757 249/*
002c1265 250 * NOTE: ignore_error is non-zero for certain disconnection races
69891757
MD
251 * which we want to silently allow, otherwise close() may return
252 * an unexpected error.
002c1265
MD
253 *
254 * NOTE: The variables (msg) and (tp) are assumed.
69891757
MD
255 */
256#define COMMON_START(so, inp, ignore_error) \
002c1265
MD
257 TCPDEBUG0; \
258 \
259 inp = so->so_pcb; \
260 do { \
69891757 261 if (inp == NULL) { \
002c1265
MD
262 error = ignore_error ? 0 : EINVAL; \
263 tp = NULL; \
264 goto out; \
69891757
MD
265 } \
266 tp = intotcpcb(inp); \
267 TCPDEBUG1(); \
268 } while(0)
f23061d4 269
0ad8e15e 270#define COMMON_END1(req, noreply) \
002c1265
MD
271 out: do { \
272 TCPDEBUG2(req); \
0ad8e15e
SZ
273 if (!(noreply)) \
274 lwkt_replymsg(&msg->lmsg, error); \
002c1265
MD
275 return; \
276 } while(0)
984263bc 277
0ad8e15e
SZ
278#define COMMON_END(req) COMMON_END1((req), 0)
279
984263bc
MD
280/*
281 * Give the socket an address.
282 */
002c1265
MD
283static void
284tcp_usr_bind(netmsg_t msg)
984263bc 285{
002c1265
MD
286 struct socket *so = msg->bind.base.nm_so;
287 struct sockaddr *nam = msg->bind.nm_nam;
288 struct thread *td = msg->bind.nm_td;
984263bc 289 int error = 0;
1cae611f 290 struct inpcb *inp;
984263bc
MD
291 struct tcpcb *tp;
292 struct sockaddr_in *sinp;
293
69891757 294 COMMON_START(so, inp, 0);
984263bc
MD
295
296 /*
297 * Must check for multicast addresses and disallow binding
298 * to them.
299 */
300 sinp = (struct sockaddr_in *)nam;
301 if (sinp->sin_family == AF_INET &&
302 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
303 error = EAFNOSUPPORT;
304 goto out;
305 }
dadab5e9 306 error = in_pcbbind(inp, nam, td);
984263bc
MD
307 if (error)
308 goto out;
309 COMMON_END(PRU_BIND);
310
311}
312
313#ifdef INET6
002c1265
MD
314
315static void
316tcp6_usr_bind(netmsg_t msg)
984263bc 317{
002c1265
MD
318 struct socket *so = msg->bind.base.nm_so;
319 struct sockaddr *nam = msg->bind.nm_nam;
320 struct thread *td = msg->bind.nm_td;
984263bc 321 int error = 0;
1cae611f 322 struct inpcb *inp;
984263bc
MD
323 struct tcpcb *tp;
324 struct sockaddr_in6 *sin6p;
325
69891757 326 COMMON_START(so, inp, 0);
984263bc
MD
327
328 /*
329 * Must check for multicast addresses and disallow binding
330 * to them.
331 */
332 sin6p = (struct sockaddr_in6 *)nam;
333 if (sin6p->sin6_family == AF_INET6 &&
334 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
335 error = EAFNOSUPPORT;
336 goto out;
337 }
338 inp->inp_vflag &= ~INP_IPV4;
339 inp->inp_vflag |= INP_IPV6;
340 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
341 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr))
342 inp->inp_vflag |= INP_IPV4;
343 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
344 struct sockaddr_in sin;
345
346 in6_sin6_2_sin(&sin, sin6p);
347 inp->inp_vflag |= INP_IPV4;
348 inp->inp_vflag &= ~INP_IPV6;
dadab5e9 349 error = in_pcbbind(inp, (struct sockaddr *)&sin, td);
984263bc
MD
350 goto out;
351 }
352 }
dadab5e9 353 error = in6_pcbbind(inp, nam, td);
984263bc
MD
354 if (error)
355 goto out;
356 COMMON_END(PRU_BIND);
357}
358#endif /* INET6 */
359
8affadf8 360struct netmsg_inswildcard {
002c1265 361 struct netmsg_base base;
8affadf8 362 struct inpcb *nm_inp;
8affadf8
JH
363};
364
4599cf19 365static void
002c1265 366in_pcbinswildcardhash_handler(netmsg_t msg)
8affadf8 367{
002c1265 368 struct netmsg_inswildcard *nm = (struct netmsg_inswildcard *)msg;
8f9b2aed 369 int cpu = mycpuid, nextcpu;
8affadf8 370
8f9b2aed
SZ
371 in_pcbinswildcardhash_oncpu(nm->nm_inp, &tcbinfo[cpu]);
372
373 nextcpu = cpu + 1;
374 if (nextcpu < ncpus2)
3abced87 375 lwkt_forwardmsg(netisr_portfn(nextcpu), &nm->base.lmsg);
8f9b2aed
SZ
376 else
377 lwkt_replymsg(&nm->base.lmsg, 0);
8affadf8 378}
002c1265 379
984263bc
MD
380/*
381 * Prepare to accept connections.
382 */
002c1265
MD
383static void
384tcp_usr_listen(netmsg_t msg)
984263bc 385{
002c1265
MD
386 struct socket *so = msg->listen.base.nm_so;
387 struct thread *td = msg->listen.nm_td;
984263bc 388 int error = 0;
1cae611f 389 struct inpcb *inp;
984263bc 390 struct tcpcb *tp;
8f9b2aed 391 struct netmsg_inswildcard nm;
984263bc 392
69891757 393 COMMON_START(so, inp, 0);
f7b29de5
SZ
394
395 if (tp->t_flags & TF_LISTEN)
396 goto out;
397
8affadf8
JH
398 if (inp->inp_lport == 0) {
399 error = in_pcbbind(inp, NULL, td);
88d239e0 400 if (error)
8affadf8
JH
401 goto out;
402 }
403
404 tp->t_state = TCPS_LISTEN;
f7b29de5 405 tp->t_flags |= TF_LISTEN;
0f758523 406 tp->tt_msg = NULL; /* Catch any invalid timer usage */
8f9b2aed 407
985b2cb0
MD
408 if (ncpus > 1) {
409 /*
410 * We have to set the flag because we can't have other cpus
411 * messing with our inp's flags.
412 */
f78f8f4a 413 KASSERT(!(inp->inp_flags & INP_CONNECTED),
ed20d0e3 414 ("already on connhash"));
f78f8f4a 415 KASSERT(!(inp->inp_flags & INP_WILDCARD),
ed20d0e3 416 ("already on wildcardhash"));
f78f8f4a 417 KASSERT(!(inp->inp_flags & INP_WILDCARD_MP),
ed20d0e3 418 ("already on MP wildcardhash"));
985b2cb0
MD
419 inp->inp_flags |= INP_WILDCARD_MP;
420
3abced87
NA
421 KKASSERT(so->so_port == netisr_portfn(0));
422 KKASSERT(&curthread->td_msgport == netisr_portfn(0));
985b2cb0
MD
423 KKASSERT(inp->inp_pcbinfo == &tcbinfo[0]);
424
425 netmsg_init(&nm.base, NULL, &curthread->td_msgport,
426 MSGF_PRIORITY, in_pcbinswildcardhash_handler);
427 nm.nm_inp = inp;
3abced87 428 lwkt_domsg(netisr_portfn(1), &nm.base.lmsg, 0);
985b2cb0 429 }
8f9b2aed 430 in_pcbinswildcardhash(inp);
984263bc
MD
431 COMMON_END(PRU_LISTEN);
432}
433
434#ifdef INET6
002c1265
MD
435
436static void
437tcp6_usr_listen(netmsg_t msg)
984263bc 438{
002c1265
MD
439 struct socket *so = msg->listen.base.nm_so;
440 struct thread *td = msg->listen.nm_td;
984263bc 441 int error = 0;
1cae611f 442 struct inpcb *inp;
984263bc 443 struct tcpcb *tp;
8f9b2aed 444 struct netmsg_inswildcard nm;
984263bc 445
69891757 446 COMMON_START(so, inp, 0);
f7b29de5
SZ
447
448 if (tp->t_flags & TF_LISTEN)
449 goto out;
450
984263bc 451 if (inp->inp_lport == 0) {
00638fa3 452 if (!(inp->inp_flags & IN6P_IPV6_V6ONLY))
984263bc 453 inp->inp_vflag |= INP_IPV4;
00638fa3
JH
454 else
455 inp->inp_vflag &= ~INP_IPV4;
60233e58 456 error = in6_pcbbind(inp, NULL, td);
88d239e0
SZ
457 if (error)
458 goto out;
984263bc 459 }
88d239e0
SZ
460
461 tp->t_state = TCPS_LISTEN;
f7b29de5 462 tp->t_flags |= TF_LISTEN;
88d239e0
SZ
463 tp->tt_msg = NULL; /* Catch any invalid timer usage */
464
985b2cb0
MD
465 if (ncpus > 1) {
466 /*
467 * We have to set the flag because we can't have other cpus
468 * messing with our inp's flags.
469 */
f78f8f4a 470 KASSERT(!(inp->inp_flags & INP_CONNECTED),
ed20d0e3 471 ("already on connhash"));
f78f8f4a 472 KASSERT(!(inp->inp_flags & INP_WILDCARD),
ed20d0e3 473 ("already on wildcardhash"));
f78f8f4a 474 KASSERT(!(inp->inp_flags & INP_WILDCARD_MP),
ed20d0e3 475 ("already on MP wildcardhash"));
985b2cb0
MD
476 inp->inp_flags |= INP_WILDCARD_MP;
477
3abced87
NA
478 KKASSERT(so->so_port == netisr_portfn(0));
479 KKASSERT(&curthread->td_msgport == netisr_portfn(0));
985b2cb0
MD
480 KKASSERT(inp->inp_pcbinfo == &tcbinfo[0]);
481
482 netmsg_init(&nm.base, NULL, &curthread->td_msgport,
483 MSGF_PRIORITY, in_pcbinswildcardhash_handler);
484 nm.nm_inp = inp;
3abced87 485 lwkt_domsg(netisr_portfn(1), &nm.base.lmsg, 0);
985b2cb0 486 }
8f9b2aed 487 in_pcbinswildcardhash(inp);
984263bc
MD
488 COMMON_END(PRU_LISTEN);
489}
490#endif /* INET6 */
491
492/*
493 * Initiate connection to peer.
494 * Create a template for use in transmissions on this connection.
495 * Enter SYN_SENT state, and mark socket as connecting.
496 * Start keep-alive timer, and seed output sequence space.
497 * Send initial segment on connection.
498 */
002c1265
MD
499static void
500tcp_usr_connect(netmsg_t msg)
984263bc 501{
002c1265
MD
502 struct socket *so = msg->connect.base.nm_so;
503 struct sockaddr *nam = msg->connect.nm_nam;
504 struct thread *td = msg->connect.nm_td;
984263bc 505 int error = 0;
1cae611f 506 struct inpcb *inp;
984263bc
MD
507 struct tcpcb *tp;
508 struct sockaddr_in *sinp;
509
69891757 510 COMMON_START(so, inp, 0);
984263bc
MD
511
512 /*
513 * Must disallow TCP ``connections'' to multicast addresses.
514 */
515 sinp = (struct sockaddr_in *)nam;
516 if (sinp->sin_family == AF_INET
517 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
518 error = EAFNOSUPPORT;
519 goto out;
520 }
521
3e4150ef
VBD
522 if (!prison_remote_ip(td, (struct sockaddr*)sinp)) {
523 error = EAFNOSUPPORT; /* IPv6 only jail */
524 goto out;
525 }
984263bc 526
002c1265
MD
527 tcp_connect(msg);
528 /* msg is invalid now */
529 return;
530out:
531 if (msg->connect.nm_m) {
532 m_freem(msg->connect.nm_m);
533 msg->connect.nm_m = NULL;
534 }
535 lwkt_replymsg(&msg->lmsg, error);
984263bc
MD
536}
537
538#ifdef INET6
002c1265
MD
539
540static void
541tcp6_usr_connect(netmsg_t msg)
984263bc 542{
002c1265
MD
543 struct socket *so = msg->connect.base.nm_so;
544 struct sockaddr *nam = msg->connect.nm_nam;
545 struct thread *td = msg->connect.nm_td;
984263bc 546 int error = 0;
1cae611f 547 struct inpcb *inp;
984263bc
MD
548 struct tcpcb *tp;
549 struct sockaddr_in6 *sin6p;
550
69891757 551 COMMON_START(so, inp, 0);
984263bc
MD
552
553 /*
554 * Must disallow TCP ``connections'' to multicast addresses.
555 */
556 sin6p = (struct sockaddr_in6 *)nam;
557 if (sin6p->sin6_family == AF_INET6
558 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
559 error = EAFNOSUPPORT;
560 goto out;
561 }
562
3e4150ef
VBD
563 if (!prison_remote_ip(td, nam)) {
564 error = EAFNOSUPPORT; /* IPv4 only jail */
565 goto out;
566 }
567
984263bc 568 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
002c1265 569 struct sockaddr_in *sinp;
984263bc
MD
570
571 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
572 error = EINVAL;
573 goto out;
574 }
002c1265
MD
575 sinp = kmalloc(sizeof(*sinp), M_LWKTMSG, M_INTWAIT);
576 in6_sin6_2_sin(sinp, sin6p);
984263bc
MD
577 inp->inp_vflag |= INP_IPV4;
578 inp->inp_vflag &= ~INP_IPV6;
002c1265
MD
579 msg->connect.nm_nam = (struct sockaddr *)sinp;
580 msg->connect.nm_reconnect |= NMSG_RECONNECT_NAMALLOC;
581 tcp_connect(msg);
582 /* msg is invalid now */
583 return;
984263bc
MD
584 }
585 inp->inp_vflag &= ~INP_IPV4;
586 inp->inp_vflag |= INP_IPV6;
587 inp->inp_inc.inc_isipv6 = 1;
002c1265
MD
588
589 msg->connect.nm_reconnect |= NMSG_RECONNECT_FALLBACK;
590 tcp6_connect(msg);
591 /* msg is invalid now */
592 return;
593out:
594 if (msg->connect.nm_m) {
595 m_freem(msg->connect.nm_m);
596 msg->connect.nm_m = NULL;
597 }
598 lwkt_replymsg(&msg->lmsg, error);
984263bc 599}
002c1265 600
984263bc
MD
601#endif /* INET6 */
602
603/*
604 * Initiate disconnect from peer.
605 * If connection never passed embryonic stage, just drop;
606 * else if don't need to let data drain, then can just drop anyways,
607 * else have to begin TCP shutdown process: mark socket disconnecting,
608 * drain unread data, state switch to reflect user close, and
609 * send segment (e.g. FIN) to peer. Socket will be really disconnected
610 * when peer sends FIN and acks ours.
611 *
612 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
613 */
002c1265
MD
614static void
615tcp_usr_disconnect(netmsg_t msg)
984263bc 616{
002c1265 617 struct socket *so = msg->disconnect.base.nm_so;
984263bc 618 int error = 0;
1cae611f 619 struct inpcb *inp;
984263bc
MD
620 struct tcpcb *tp;
621
69891757 622 COMMON_START(so, inp, 1);
984263bc
MD
623 tp = tcp_disconnect(tp);
624 COMMON_END(PRU_DISCONNECT);
625}
626
627/*
628 * Accept a connection. Essentially all the work is
629 * done at higher levels; just return the address
630 * of the peer, storing through addr.
631 */
002c1265
MD
632static void
633tcp_usr_accept(netmsg_t msg)
984263bc 634{
002c1265
MD
635 struct socket *so = msg->accept.base.nm_so;
636 struct sockaddr **nam = msg->accept.nm_nam;
984263bc 637 int error = 0;
1cae611f 638 struct inpcb *inp;
984263bc
MD
639 struct tcpcb *tp = NULL;
640 TCPDEBUG0;
641
1cae611f 642 inp = so->so_pcb;
984263bc
MD
643 if (so->so_state & SS_ISDISCONNECTED) {
644 error = ECONNABORTED;
645 goto out;
646 }
002c1265
MD
647 if (inp == 0) {
648 error = EINVAL;
649 goto out;
650 }
6cef7136 651
984263bc
MD
652 tp = intotcpcb(inp);
653 TCPDEBUG1();
654 in_setpeeraddr(so, nam);
655 COMMON_END(PRU_ACCEPT);
656}
657
658#ifdef INET6
002c1265
MD
659static void
660tcp6_usr_accept(netmsg_t msg)
984263bc 661{
002c1265
MD
662 struct socket *so = msg->accept.base.nm_so;
663 struct sockaddr **nam = msg->accept.nm_nam;
984263bc 664 int error = 0;
1cae611f 665 struct inpcb *inp;
984263bc
MD
666 struct tcpcb *tp = NULL;
667 TCPDEBUG0;
668
1cae611f
MD
669 inp = so->so_pcb;
670
984263bc
MD
671 if (so->so_state & SS_ISDISCONNECTED) {
672 error = ECONNABORTED;
673 goto out;
674 }
002c1265
MD
675 if (inp == 0) {
676 error = EINVAL;
677 goto out;
678 }
984263bc
MD
679 tp = intotcpcb(inp);
680 TCPDEBUG1();
681 in6_mapped_peeraddr(so, nam);
682 COMMON_END(PRU_ACCEPT);
683}
684#endif /* INET6 */
685/*
686 * Mark the connection as being incapable of further output.
687 */
002c1265
MD
688static void
689tcp_usr_shutdown(netmsg_t msg)
984263bc 690{
002c1265 691 struct socket *so = msg->shutdown.base.nm_so;
984263bc 692 int error = 0;
1cae611f 693 struct inpcb *inp;
984263bc
MD
694 struct tcpcb *tp;
695
69891757 696 COMMON_START(so, inp, 0);
984263bc
MD
697 socantsendmore(so);
698 tp = tcp_usrclosed(tp);
699 if (tp)
700 error = tcp_output(tp);
701 COMMON_END(PRU_SHUTDOWN);
702}
703
704/*
705 * After a receive, possibly send window update to peer.
706 */
002c1265
MD
707static void
708tcp_usr_rcvd(netmsg_t msg)
984263bc 709{
002c1265 710 struct socket *so = msg->rcvd.base.nm_so;
96c6eb29 711 int error = 0, noreply = 0;
1cae611f 712 struct inpcb *inp;
984263bc
MD
713 struct tcpcb *tp;
714
69891757 715 COMMON_START(so, inp, 0);
96c6eb29
SZ
716
717 if (msg->rcvd.nm_pru_flags & PRUR_ASYNC) {
718 noreply = 1;
719 so_async_rcvd_reply(so);
720 }
984263bc 721 tcp_output(tp);
96c6eb29
SZ
722
723 COMMON_END1(PRU_RCVD, noreply);
984263bc
MD
724}
725
726/*
727 * Do a send by putting data in output queue and updating urgent
728 * marker if URG set. Possibly send more data. Unlike the other
729 * pru_*() routines, the mbuf chains are our responsibility. We
730 * must either enqueue them or free them. The other pru_* routines
731 * generally are caller-frees.
732 */
002c1265
MD
733static void
734tcp_usr_send(netmsg_t msg)
984263bc 735{
002c1265
MD
736 struct socket *so = msg->send.base.nm_so;
737 int flags = msg->send.nm_flags;
738 struct mbuf *m = msg->send.nm_m;
984263bc 739 int error = 0;
1cae611f 740 struct inpcb *inp;
984263bc 741 struct tcpcb *tp;
984263bc
MD
742 TCPDEBUG0;
743
7b7dc575
SZ
744 KKASSERT(msg->send.nm_control == NULL);
745 KKASSERT(msg->send.nm_addr == NULL);
746 KKASSERT((flags & PRUS_FREEADDR) == 0);
5bc42dd1 747
1cae611f
MD
748 inp = so->so_pcb;
749
984263bc
MD
750 if (inp == NULL) {
751 /*
752 * OOPS! we lost a race, the TCP session got reset after
753 * we checked SS_CANTSENDMORE, eg: while doing uiomove or a
1cae611f 754 * network interrupt in the non-critical section of sosend().
984263bc 755 */
48e7b118 756 m_freem(m);
984263bc
MD
757 error = ECONNRESET; /* XXX EPIPE? */
758 tp = NULL;
759 TCPDEBUG1();
760 goto out;
761 }
984263bc
MD
762 tp = intotcpcb(inp);
763 TCPDEBUG1();
984263bc 764
8b0272b9
SZ
765#ifdef foo
766 /*
767 * This is no longer necessary, since:
768 * - sosendtcp() has already checked it for us
769 * - It does not work with asynchronized send
770 */
771
48e7b118
MD
772 /*
773 * Don't let too much OOB data build up
774 */
775 if (flags & PRUS_OOB) {
6d49aa6f 776 if (ssb_space(&so->so_snd) < -512) {
984263bc
MD
777 m_freem(m);
778 error = ENOBUFS;
779 goto out;
780 }
48e7b118 781 }
8b0272b9 782#endif
48e7b118 783
48e7b118
MD
784 /*
785 * Pump the data into the socket.
786 */
787 if (m)
788 ssb_appendstream(&so->so_snd, m);
789 if (flags & PRUS_OOB) {
984263bc
MD
790 /*
791 * According to RFC961 (Assigned Protocols),
792 * the urgent pointer points to the last octet
793 * of urgent data. We continue, however,
794 * to consider it to indicate the first octet
795 * of data past the urgent section.
796 * Otherwise, snd_up should be one lower.
797 */
6d49aa6f 798 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc;
c1d3b892 799 tp->t_flags |= TF_FORCE;
984263bc 800 error = tcp_output(tp);
c1d3b892 801 tp->t_flags &= ~TF_FORCE;
48e7b118
MD
802 } else {
803 if (flags & PRUS_EOF) {
804 /*
805 * Close the send side of the connection after
806 * the data is sent.
807 */
808 socantsendmore(so);
809 tp = tcp_usrclosed(tp);
810 }
811 if (tp != NULL) {
812 if (flags & PRUS_MORETOCOME)
813 tp->t_flags |= TF_MORETOCOME;
814 error = tcp_output(tp);
815 if (flags & PRUS_MORETOCOME)
816 tp->t_flags &= ~TF_MORETOCOME;
817 }
984263bc 818 }
0ad8e15e
SZ
819 COMMON_END1((flags & PRUS_OOB) ? PRU_SENDOOB :
820 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND),
821 (flags & PRUS_NOREPLY));
984263bc
MD
822}
823
824/*
6cef7136
MD
825 * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort()
826 * will sofree() it when we return.
984263bc 827 */
002c1265
MD
828static void
829tcp_usr_abort(netmsg_t msg)
984263bc 830{
002c1265 831 struct socket *so = msg->abort.base.nm_so;
984263bc 832 int error = 0;
1cae611f 833 struct inpcb *inp;
984263bc
MD
834 struct tcpcb *tp;
835
69891757 836 COMMON_START(so, inp, 1);
984263bc
MD
837 tp = tcp_drop(tp, ECONNABORTED);
838 COMMON_END(PRU_ABORT);
839}
840
841/*
842 * Receive out-of-band data.
843 */
002c1265
MD
844static void
845tcp_usr_rcvoob(netmsg_t msg)
984263bc 846{
002c1265
MD
847 struct socket *so = msg->rcvoob.base.nm_so;
848 struct mbuf *m = msg->rcvoob.nm_m;
849 int flags = msg->rcvoob.nm_flags;
984263bc 850 int error = 0;
1cae611f 851 struct inpcb *inp;
984263bc
MD
852 struct tcpcb *tp;
853
69891757 854 COMMON_START(so, inp, 0);
984263bc
MD
855 if ((so->so_oobmark == 0 &&
856 (so->so_state & SS_RCVATMARK) == 0) ||
857 so->so_options & SO_OOBINLINE ||
858 tp->t_oobflags & TCPOOB_HADDATA) {
859 error = EINVAL;
860 goto out;
861 }
862 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
863 error = EWOULDBLOCK;
864 goto out;
865 }
866 m->m_len = 1;
867 *mtod(m, caddr_t) = tp->t_iobc;
868 if ((flags & MSG_PEEK) == 0)
869 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
870 COMMON_END(PRU_RCVOOB);
871}
872
88da6203
SZ
873static void
874tcp_usr_savefaddr(struct socket *so, const struct sockaddr *faddr)
875{
876 in_savefaddr(so, faddr);
877}
878
68dc4251
SZ
879#ifdef INET6
880static void
881tcp6_usr_savefaddr(struct socket *so, const struct sockaddr *faddr)
882{
883 in6_mapped_savefaddr(so, faddr);
884}
885#endif
886
984263bc
MD
887/* xxx - should be const */
888struct pr_usrreqs tcp_usrreqs = {
fa5e758c
MD
889 .pru_abort = tcp_usr_abort,
890 .pru_accept = tcp_usr_accept,
891 .pru_attach = tcp_usr_attach,
892 .pru_bind = tcp_usr_bind,
893 .pru_connect = tcp_usr_connect,
002c1265
MD
894 .pru_connect2 = pr_generic_notsupp,
895 .pru_control = in_control_dispatch,
fa5e758c
MD
896 .pru_detach = tcp_usr_detach,
897 .pru_disconnect = tcp_usr_disconnect,
898 .pru_listen = tcp_usr_listen,
002c1265 899 .pru_peeraddr = in_setpeeraddr_dispatch,
fa5e758c
MD
900 .pru_rcvd = tcp_usr_rcvd,
901 .pru_rcvoob = tcp_usr_rcvoob,
902 .pru_send = tcp_usr_send,
903 .pru_sense = pru_sense_null,
904 .pru_shutdown = tcp_usr_shutdown,
002c1265 905 .pru_sockaddr = in_setsockaddr_dispatch,
5bc42dd1 906 .pru_sosend = sosendtcp,
9510c423 907 .pru_soreceive = sorecvtcp,
88da6203 908 .pru_savefaddr = tcp_usr_savefaddr
984263bc
MD
909};
910
911#ifdef INET6
912struct pr_usrreqs tcp6_usrreqs = {
fa5e758c
MD
913 .pru_abort = tcp_usr_abort,
914 .pru_accept = tcp6_usr_accept,
915 .pru_attach = tcp_usr_attach,
916 .pru_bind = tcp6_usr_bind,
917 .pru_connect = tcp6_usr_connect,
002c1265
MD
918 .pru_connect2 = pr_generic_notsupp,
919 .pru_control = in6_control_dispatch,
fa5e758c
MD
920 .pru_detach = tcp_usr_detach,
921 .pru_disconnect = tcp_usr_disconnect,
922 .pru_listen = tcp6_usr_listen,
002c1265 923 .pru_peeraddr = in6_mapped_peeraddr_dispatch,
fa5e758c
MD
924 .pru_rcvd = tcp_usr_rcvd,
925 .pru_rcvoob = tcp_usr_rcvoob,
926 .pru_send = tcp_usr_send,
927 .pru_sense = pru_sense_null,
928 .pru_shutdown = tcp_usr_shutdown,
002c1265 929 .pru_sockaddr = in6_mapped_sockaddr_dispatch,
5bc42dd1 930 .pru_sosend = sosendtcp,
9510c423 931 .pru_soreceive = sorecvtcp,
68dc4251 932 .pru_savefaddr = tcp6_usr_savefaddr
984263bc
MD
933};
934#endif /* INET6 */
935
984263bc 936static int
48e7b118
MD
937tcp_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf *m,
938 struct sockaddr_in *sin, struct sockaddr_in *if_sin)
984263bc
MD
939{
940 struct inpcb *inp = tp->t_inpcb, *oinp;
941 struct socket *so = inp->inp_socket;
03fb1cae 942 struct route *ro = &inp->inp_route;
984263bc 943
7fe56515 944 oinp = in_pcblookup_hash(&tcbinfo[mycpu->gd_cpuid],
002c1265
MD
945 sin->sin_addr, sin->sin_port,
946 (inp->inp_laddr.s_addr != INADDR_ANY ?
947 inp->inp_laddr : if_sin->sin_addr),
948 inp->inp_lport, 0, NULL);
13d8907a 949 if (oinp != NULL) {
27b8aee3
AE
950 m_freem(m);
951 return (EADDRINUSE);
984263bc
MD
952 }
953 if (inp->inp_laddr.s_addr == INADDR_ANY)
13d8907a 954 inp->inp_laddr = if_sin->sin_addr;
984263bc
MD
955 inp->inp_faddr = sin->sin_addr;
956 inp->inp_fport = sin->sin_port;
7fe56515 957 inp->inp_cpcbinfo = &tcbinfo[mycpu->gd_cpuid];
13d8907a 958 in_pcbinsconnhash(inp);
984263bc 959
03fb1cae
SZ
960 /*
961 * We are now on the inpcb's owner CPU, if the cached route was
962 * freed because the rtentry's owner CPU is not the current CPU
963 * (e.g. in tcp_connect()), then we try to reallocate it here with
964 * the hope that a rtentry may be cloned from a RTF_PRCLONING
965 * rtentry.
966 */
967 if (!(inp->inp_socket->so_options & SO_DONTROUTE) && /*XXX*/
968 ro->ro_rt == NULL) {
969 bzero(&ro->ro_dst, sizeof(struct sockaddr_in));
970 ro->ro_dst.sa_family = AF_INET;
971 ro->ro_dst.sa_len = sizeof(struct sockaddr_in);
972 ((struct sockaddr_in *)&ro->ro_dst)->sin_addr =
973 sin->sin_addr;
974 rtalloc(ro);
975 }
976
3db1c8a3 977 /*
48e7b118
MD
978 * Now that no more errors can occur, change the protocol processing
979 * port to the current thread (which is the correct thread).
980 *
3db1c8a3
SZ
981 * Create TCP timer message now; we are on the tcpcb's owner
982 * CPU/thread.
983 */
984 tcp_create_timermsg(tp, &curthread->td_msgport);
0f758523 985
46e92930
MD
986 /*
987 * Compute window scaling to request. Use a larger scaling then
988 * needed for the initial receive buffer in case the receive buffer
989 * gets expanded.
990 */
991 if (tp->request_r_scale < TCP_MIN_WINSHIFT)
992 tp->request_r_scale = TCP_MIN_WINSHIFT;
984263bc 993 while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
46e92930
MD
994 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat
995 ) {
984263bc 996 tp->request_r_scale++;
46e92930 997 }
984263bc
MD
998
999 soisconnecting(so);
1000 tcpstat.tcps_connattempt++;
1001 tp->t_state = TCPS_SYN_SENT;
2ce132be 1002 tcp_callout_reset(tp, tp->tt_keep, tp->t_keepinit, tcp_timer_keep);
984263bc 1003 tp->iss = tcp_new_isn(tp);
984263bc 1004 tcp_sendseqinit(tp);
48e7b118
MD
1005 if (m) {
1006 ssb_appendstream(&so->so_snd, m);
1007 m = NULL;
1008 if (flags & PRUS_OOB)
1009 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc;
1010 }
984263bc 1011
48e7b118
MD
1012 /*
1013 * Close the send side of the connection after
1014 * the data is sent if flagged.
1015 */
1016 if ((flags & (PRUS_OOB|PRUS_EOF)) == PRUS_EOF) {
1017 socantsendmore(so);
1018 tp = tcp_usrclosed(tp);
1019 }
1020 return (tcp_output(tp));
984263bc
MD
1021}
1022
7fe56515
JH
1023/*
1024 * Common subroutine to open a TCP connection to remote host specified
1025 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local
1026 * port number if needed. Call in_pcbladdr to do the routing and to choose
27b8aee3 1027 * a local host address (interface).
7fe56515
JH
1028 * Initialize connection parameters and enter SYN-SENT state.
1029 */
002c1265
MD
1030static void
1031tcp_connect(netmsg_t msg)
7fe56515 1032{
002c1265
MD
1033 struct socket *so = msg->connect.base.nm_so;
1034 struct sockaddr *nam = msg->connect.nm_nam;
1035 struct thread *td = msg->connect.nm_td;
7fe56515
JH
1036 struct sockaddr_in *sin = (struct sockaddr_in *)nam;
1037 struct sockaddr_in *if_sin;
002c1265
MD
1038 struct inpcb *inp;
1039 struct tcpcb *tp;
4fd40da5 1040 int error, calc_laddr = 1;
7fe56515 1041 lwkt_port_t port;
7fe56515 1042
002c1265
MD
1043 COMMON_START(so, inp, 0);
1044
1045 /*
1046 * Reconnect our pcb if we have to
1047 */
1048 if (msg->connect.nm_reconnect & NMSG_RECONNECT_RECONNECT) {
1049 msg->connect.nm_reconnect &= ~NMSG_RECONNECT_RECONNECT;
1050 in_pcblink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1051 }
1052
9c7b7c43
SZ
1053 /*
1054 * Bind if we have to
1055 */
1056 if (inp->inp_lport == 0) {
1057 if (tcp_lport_extension) {
db26865d
SZ
1058 KKASSERT(inp->inp_laddr.s_addr == INADDR_ANY);
1059
1060 error = in_pcbladdr(inp, nam, &if_sin, td);
1061 if (error)
1062 goto out;
1063 inp->inp_laddr.s_addr = if_sin->sin_addr.s_addr;
1064
1065 error = in_pcbconn_bind(inp, nam, td);
1066 if (error)
1067 goto out;
4fd40da5
SZ
1068
1069 calc_laddr = 0;
9c7b7c43 1070 } else {
db26865d
SZ
1071 error = in_pcbbind(inp, NULL, td);
1072 if (error)
1073 goto out;
1074 }
4fd40da5 1075 }
db26865d 1076
4fd40da5 1077 if (calc_laddr) {
db26865d
SZ
1078 /*
1079 * Calculate the correct protocol processing thread. The
1080 * connect operation must run there. Set the forwarding
1081 * port before we forward the message or it will get bounced
1082 * right back to us.
1083 */
1084 error = in_pcbladdr(inp, nam, &if_sin, td);
002c1265
MD
1085 if (error)
1086 goto out;
7fe56515 1087 }
b25d27f4
SZ
1088 KKASSERT(inp->inp_socket == so);
1089
7fe56515 1090 port = tcp_addrport(sin->sin_addr.s_addr, sin->sin_port,
002c1265
MD
1091 (inp->inp_laddr.s_addr ?
1092 inp->inp_laddr.s_addr : if_sin->sin_addr.s_addr),
1093 inp->inp_lport);
7fe56515 1094
fb0f29c4 1095 if (port != &curthread->td_msgport) {
a46456f3
SZ
1096 struct route *ro = &inp->inp_route;
1097
1098 /*
1099 * in_pcbladdr() may have allocated a route entry for us
1100 * on the current CPU, but we need a route entry on the
03fb1cae 1101 * inpcb's owner CPU, so free it here.
a46456f3
SZ
1102 */
1103 if (ro->ro_rt != NULL)
1104 RTFREE(ro->ro_rt);
1105 bzero(ro, sizeof(*ro));
540a0bf0 1106
48e7b118 1107 /*
0ce0603e
MD
1108 * We are moving the protocol processing port the socket
1109 * is on, we have to unlink here and re-link on the
1110 * target cpu.
48e7b118 1111 */
0ce0603e
MD
1112 in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1113 sosetport(so, port);
002c1265
MD
1114 msg->connect.nm_reconnect |= NMSG_RECONNECT_RECONNECT;
1115 msg->connect.base.nm_dispatch = tcp_connect;
0ce0603e 1116
002c1265
MD
1117 lwkt_forwardmsg(port, &msg->connect.base.lmsg);
1118 /* msg invalid now */
1119 return;
48e7b118 1120 }
002c1265
MD
1121 error = tcp_connect_oncpu(tp, msg->connect.nm_flags,
1122 msg->connect.nm_m, sin, if_sin);
1123 msg->connect.nm_m = NULL;
1124out:
1125 if (msg->connect.nm_m) {
1126 m_freem(msg->connect.nm_m);
1127 msg->connect.nm_m = NULL;
1128 }
1129 if (msg->connect.nm_reconnect & NMSG_RECONNECT_NAMALLOC) {
1130 kfree(msg->connect.nm_nam, M_LWKTMSG);
1131 msg->connect.nm_nam = NULL;
1132 }
1133 lwkt_replymsg(&msg->connect.base.lmsg, error);
1134 /* msg invalid now */
7fe56515
JH
1135}
1136
984263bc 1137#ifdef INET6
65f3e756 1138
002c1265
MD
1139static void
1140tcp6_connect(netmsg_t msg)
984263bc 1141{
002c1265
MD
1142 struct tcpcb *tp;
1143 struct socket *so = msg->connect.base.nm_so;
1144 struct sockaddr *nam = msg->connect.nm_nam;
1145 struct thread *td = msg->connect.nm_td;
1146 struct inpcb *inp;
984263bc
MD
1147 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
1148 struct in6_addr *addr6;
65f3e756 1149 lwkt_port_t port;
984263bc
MD
1150 int error;
1151
002c1265
MD
1152 COMMON_START(so, inp, 0);
1153
1154 /*
1155 * Reconnect our pcb if we have to
1156 */
1157 if (msg->connect.nm_reconnect & NMSG_RECONNECT_RECONNECT) {
1158 msg->connect.nm_reconnect &= ~NMSG_RECONNECT_RECONNECT;
1159 in_pcblink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1160 }
1161
1162 /*
1163 * Bind if we have to
1164 */
984263bc 1165 if (inp->inp_lport == 0) {
60233e58 1166 error = in6_pcbbind(inp, NULL, td);
002c1265
MD
1167 if (error)
1168 goto out;
984263bc
MD
1169 }
1170
1171 /*
1172 * Cannot simply call in_pcbconnect, because there might be an
1173 * earlier incarnation of this same connection still in
1174 * TIME_WAIT state, creating an ADDRINUSE error.
1175 */
3e4150ef 1176 error = in6_pcbladdr(inp, nam, &addr6, td);
002c1265
MD
1177 if (error)
1178 goto out;
65f3e756 1179
65f3e756
MD
1180 port = tcp6_addrport(); /* XXX hack for now, always cpu0 */
1181
1182 if (port != &curthread->td_msgport) {
65f3e756
MD
1183 struct route *ro = &inp->inp_route;
1184
1185 /*
1186 * in_pcbladdr() may have allocated a route entry for us
1187 * on the current CPU, but we need a route entry on the
1188 * inpcb's owner CPU, so free it here.
1189 */
1190 if (ro->ro_rt != NULL)
1191 RTFREE(ro->ro_rt);
1192 bzero(ro, sizeof(*ro));
1193
002c1265
MD
1194 in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1195 sosetport(so, port);
1196 msg->connect.nm_reconnect |= NMSG_RECONNECT_RECONNECT;
1197 msg->connect.base.nm_dispatch = tcp6_connect;
1198
1199 lwkt_forwardmsg(port, &msg->connect.base.lmsg);
1200 /* msg invalid now */
1201 return;
48e7b118 1202 }
002c1265
MD
1203 error = tcp6_connect_oncpu(tp, msg->connect.nm_flags,
1204 &msg->connect.nm_m, sin6, addr6);
1205 /* nm_m may still be intact */
1206out:
1207 if (error && (msg->connect.nm_reconnect & NMSG_RECONNECT_FALLBACK)) {
1208 tcp_connect(msg);
1209 /* msg invalid now */
1210 } else {
1211 if (msg->connect.nm_m) {
1212 m_freem(msg->connect.nm_m);
1213 msg->connect.nm_m = NULL;
1214 }
1215 if (msg->connect.nm_reconnect & NMSG_RECONNECT_NAMALLOC) {
1216 kfree(msg->connect.nm_nam, M_LWKTMSG);
1217 msg->connect.nm_nam = NULL;
1218 }
1219 lwkt_replymsg(&msg->connect.base.lmsg, error);
1220 /* msg invalid now */
1221 }
65f3e756
MD
1222}
1223
1224static int
002c1265 1225tcp6_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf **mp,
48e7b118 1226 struct sockaddr_in6 *sin6, struct in6_addr *addr6)
65f3e756 1227{
002c1265 1228 struct mbuf *m = *mp;
65f3e756
MD
1229 struct inpcb *inp = tp->t_inpcb;
1230 struct socket *so = inp->inp_socket;
1231 struct inpcb *oinp;
65f3e756 1232
48e7b118
MD
1233 /*
1234 * Cannot simply call in_pcbconnect, because there might be an
1235 * earlier incarnation of this same connection still in
1236 * TIME_WAIT state, creating an ADDRINUSE error.
1237 */
7fe56515 1238 oinp = in6_pcblookup_hash(inp->inp_cpcbinfo,
984263bc 1239 &sin6->sin6_addr, sin6->sin6_port,
002c1265
MD
1240 (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) ?
1241 addr6 : &inp->in6p_laddr),
984263bc 1242 inp->inp_lport, 0, NULL);
002c1265 1243 if (oinp)
27b8aee3 1244 return (EADDRINUSE);
002c1265 1245
984263bc
MD
1246 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
1247 inp->in6p_laddr = *addr6;
1248 inp->in6p_faddr = sin6->sin6_addr;
1249 inp->inp_fport = sin6->sin6_port;
3641b7ca 1250 if ((sin6->sin6_flowinfo & IPV6_FLOWINFO_MASK) != 0)
984263bc 1251 inp->in6p_flowinfo = sin6->sin6_flowinfo;
13d8907a 1252 in_pcbinsconnhash(inp);
984263bc 1253
48e7b118
MD
1254 /*
1255 * Now that no more errors can occur, change the protocol processing
1256 * port to the current thread (which is the correct thread).
1257 *
1258 * Create TCP timer message now; we are on the tcpcb's owner
1259 * CPU/thread.
1260 */
3db1c8a3
SZ
1261 tcp_create_timermsg(tp, &curthread->td_msgport);
1262
984263bc 1263 /* Compute window scaling to request. */
46e92930
MD
1264 if (tp->request_r_scale < TCP_MIN_WINSHIFT)
1265 tp->request_r_scale = TCP_MIN_WINSHIFT;
984263bc 1266 while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
46e92930 1267 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat) {
984263bc 1268 tp->request_r_scale++;
46e92930 1269 }
984263bc
MD
1270
1271 soisconnecting(so);
1272 tcpstat.tcps_connattempt++;
1273 tp->t_state = TCPS_SYN_SENT;
2ce132be 1274 tcp_callout_reset(tp, tp->tt_keep, tp->t_keepinit, tcp_timer_keep);
984263bc 1275 tp->iss = tcp_new_isn(tp);
984263bc 1276 tcp_sendseqinit(tp);
48e7b118
MD
1277 if (m) {
1278 ssb_appendstream(&so->so_snd, m);
002c1265 1279 *mp = NULL;
48e7b118
MD
1280 if (flags & PRUS_OOB)
1281 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc;
1282 }
984263bc 1283
48e7b118
MD
1284 /*
1285 * Close the send side of the connection after
1286 * the data is sent if flagged.
1287 */
1288 if ((flags & (PRUS_OOB|PRUS_EOF)) == PRUS_EOF) {
1289 socantsendmore(so);
1290 tp = tcp_usrclosed(tp);
1291 }
1292 return (tcp_output(tp));
984263bc 1293}
65f3e756 1294
984263bc
MD
1295#endif /* INET6 */
1296
1297/*
1298 * The new sockopt interface makes it possible for us to block in the
1cae611f
MD
1299 * copyin/out step (if we take a page fault). Taking a page fault while
1300 * in a critical section is probably a Bad Thing. (Since sockets and pcbs
1301 * both now use TSM, there probably isn't any need for this function to
1302 * run in a critical section any more. This needs more examination.)
984263bc 1303 */
002c1265
MD
1304void
1305tcp_ctloutput(netmsg_t msg)
984263bc 1306{
002c1265
MD
1307 struct socket *so = msg->base.nm_so;
1308 struct sockopt *sopt = msg->ctloutput.nm_sopt;
2ce132be 1309 int error, opt, optval, opthz;
984263bc
MD
1310 struct inpcb *inp;
1311 struct tcpcb *tp;
1312
1313 error = 0;
ed894f8c 1314 inp = so->so_pcb;
002c1265
MD
1315 if (inp == NULL) {
1316 error = ECONNRESET;
1317 goto done;
1318 }
6cef7136 1319
984263bc
MD
1320 if (sopt->sopt_level != IPPROTO_TCP) {
1321#ifdef INET6
1322 if (INP_CHECK_SOCKAF(so, AF_INET6))
002c1265 1323 ip6_ctloutput_dispatch(msg);
984263bc
MD
1324 else
1325#endif /* INET6 */
002c1265
MD
1326 ip_ctloutput(msg);
1327 /* msg invalid now */
1328 return;
984263bc
MD
1329 }
1330 tp = intotcpcb(inp);
1331
1332 switch (sopt->sopt_dir) {
1333 case SOPT_SET:
e71a125f
AE
1334 error = soopt_to_kbuf(sopt, &optval, sizeof optval,
1335 sizeof optval);
1336 if (error)
1337 break;
984263bc 1338 switch (sopt->sopt_name) {
2a0c7c52 1339 case TCP_FASTKEEP:
fb8d5c6d
SZ
1340 if (optval > 0)
1341 tp->t_keepidle = tp->t_keepintvl;
1342 else
1343 tp->t_keepidle = tcp_keepidle;
1344 tcp_timer_keep_activity(tp, 0);
2a0c7c52 1345 break;
b1992928
MD
1346#ifdef TCP_SIGNATURE
1347 case TCP_SIGNATURE_ENABLE:
d0be4e27
SZ
1348 if (tp->t_state == TCPS_CLOSED) {
1349 /*
1350 * This is the only safe state that this
1351 * option could be changed. Some segments
1352 * could already have been sent in other
1353 * states.
1354 */
1355 if (optval > 0)
1356 tp->t_flags |= TF_SIGNATURE;
1357 else
1358 tp->t_flags &= ~TF_SIGNATURE;
1359 } else {
1360 error = EOPNOTSUPP;
1361 }
b1992928
MD
1362 break;
1363#endif /* TCP_SIGNATURE */
984263bc
MD
1364 case TCP_NODELAY:
1365 case TCP_NOOPT:
984263bc
MD
1366 switch (sopt->sopt_name) {
1367 case TCP_NODELAY:
1368 opt = TF_NODELAY;
1369 break;
1370 case TCP_NOOPT:
1371 opt = TF_NOOPT;
1372 break;
1373 default:
1374 opt = 0; /* dead code to fool gcc */
1375 break;
1376 }
1377
1378 if (optval)
1379 tp->t_flags |= opt;
1380 else
1381 tp->t_flags &= ~opt;
1382 break;
1383
1384 case TCP_NOPUSH:
3533a183
SZ
1385 if (tcp_disable_nopush)
1386 break;
984263bc
MD
1387 if (optval)
1388 tp->t_flags |= TF_NOPUSH;
1389 else {
1390 tp->t_flags &= ~TF_NOPUSH;
1391 error = tcp_output(tp);
1392 }
1393 break;
1394
1395 case TCP_MAXSEG:
153d34ac
MD
1396 /*
1397 * Must be between 0 and maxseg. If the requested
1398 * maxseg is too small to satisfy the desired minmss,
1399 * pump it up (silently so sysctl modifications of
1400 * minmss do not create unexpected program failures).
1401 * Handle degenerate cases.
1402 */
1403 if (optval > 0 && optval <= tp->t_maxseg) {
1404 if (optval + 40 < tcp_minmss) {
1405 optval = tcp_minmss - 40;
1406 if (optval < 0)
1407 optval = 1;
1408 }
984263bc 1409 tp->t_maxseg = optval;
153d34ac 1410 } else {
984263bc 1411 error = EINVAL;
153d34ac 1412 }
984263bc
MD
1413 break;
1414
2ce132be
SZ
1415 case TCP_KEEPINIT:
1416 opthz = ((int64_t)optval * hz) / 1000;
1417 if (opthz >= 1)
1418 tp->t_keepinit = opthz;
1419 else
1420 error = EINVAL;
1421 break;
1422
7ea3a353
SZ
1423 case TCP_KEEPIDLE:
1424 opthz = ((int64_t)optval * hz) / 1000;
0a2b0c05 1425 if (opthz >= 1) {
7ea3a353 1426 tp->t_keepidle = opthz;
0a2b0c05
SZ
1427 tcp_timer_keep_activity(tp, 0);
1428 } else {
7ea3a353 1429 error = EINVAL;
0a2b0c05 1430 }
7ea3a353
SZ
1431 break;
1432
5d61ded3
SZ
1433 case TCP_KEEPINTVL:
1434 opthz = ((int64_t)optval * hz) / 1000;
1435 if (opthz >= 1) {
1436 tp->t_keepintvl = opthz;
1437 tp->t_maxidle = tp->t_keepintvl * tp->t_keepcnt;
1438 } else {
1439 error = EINVAL;
1440 }
1441 break;
1442
1443 case TCP_KEEPCNT:
1444 if (optval > 0) {
1445 tp->t_keepcnt = optval;
1446 tp->t_maxidle = tp->t_keepintvl * tp->t_keepcnt;
1447 } else {
1448 error = EINVAL;
1449 }
1450 break;
1451
984263bc
MD
1452 default:
1453 error = ENOPROTOOPT;
1454 break;
1455 }
1456 break;
1457
1458 case SOPT_GET:
1459 switch (sopt->sopt_name) {
b1992928
MD
1460#ifdef TCP_SIGNATURE
1461 case TCP_SIGNATURE_ENABLE:
1462 optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0;
1463 break;
1464#endif /* TCP_SIGNATURE */
984263bc
MD
1465 case TCP_NODELAY:
1466 optval = tp->t_flags & TF_NODELAY;
1467 break;
1468 case TCP_MAXSEG:
1469 optval = tp->t_maxseg;
1470 break;
1471 case TCP_NOOPT:
1472 optval = tp->t_flags & TF_NOOPT;
1473 break;
1474 case TCP_NOPUSH:
1475 optval = tp->t_flags & TF_NOPUSH;
1476 break;
2ce132be
SZ
1477 case TCP_KEEPINIT:
1478 optval = ((int64_t)tp->t_keepinit * 1000) / hz;
1479 break;
7ea3a353
SZ
1480 case TCP_KEEPIDLE:
1481 optval = ((int64_t)tp->t_keepidle * 1000) / hz;
1482 break;
5d61ded3
SZ
1483 case TCP_KEEPINTVL:
1484 optval = ((int64_t)tp->t_keepintvl * 1000) / hz;
1485 break;
1486 case TCP_KEEPCNT:
1487 optval = tp->t_keepcnt;
1488 break;
984263bc
MD
1489 default:
1490 error = ENOPROTOOPT;
1491 break;
1492 }
1493 if (error == 0)
e71a125f 1494 soopt_from_kbuf(sopt, &optval, sizeof optval);
984263bc
MD
1495 break;
1496 }
002c1265
MD
1497done:
1498 lwkt_replymsg(&msg->lmsg, error);
984263bc
MD
1499}
1500
1501/*
1502 * tcp_sendspace and tcp_recvspace are the default send and receive window
1503 * sizes, respectively. These are obsolescent (this information should
1504 * be set by the route).
0560a274
MD
1505 *
1506 * Use a default that does not require tcp window scaling to be turned
1507 * on. Individual programs or the administrator can increase the default.
984263bc 1508 */
0560a274 1509u_long tcp_sendspace = 57344; /* largest multiple of PAGE_SIZE < 64k */
f23061d4 1510SYSCTL_INT(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW,
984263bc
MD
1511 &tcp_sendspace , 0, "Maximum outgoing TCP datagram size");
1512u_long tcp_recvspace = 57344; /* largest multiple of PAGE_SIZE < 64k */
f23061d4 1513SYSCTL_INT(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
984263bc
MD
1514 &tcp_recvspace , 0, "Maximum incoming TCP datagram size");
1515
1516/*
0ce0603e
MD
1517 * Attach TCP protocol to socket, allocating internet protocol control
1518 * block, tcp control block, bufer space, and entering LISTEN state
1519 * if to accept connections.
984263bc
MD
1520 */
1521static int
e4700d00 1522tcp_attach(struct socket *so, struct pru_attach_info *ai)
984263bc 1523{
2256ba69 1524 struct tcpcb *tp;
984263bc
MD
1525 struct inpcb *inp;
1526 int error;
6ca1a1cd 1527 int cpu;
984263bc 1528#ifdef INET6
3641b7ca 1529 int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6) != 0;
984263bc
MD
1530#endif
1531
6d49aa6f 1532 if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) {
6cef7136 1533 lwkt_gettoken(&so->so_rcv.ssb_token);
e4700d00
JH
1534 error = soreserve(so, tcp_sendspace, tcp_recvspace,
1535 ai->sb_rlimit);
6cef7136 1536 lwkt_reltoken(&so->so_rcv.ssb_token);
984263bc
MD
1537 if (error)
1538 return (error);
1539 }
14343ad3
MD
1540 atomic_set_int(&so->so_rcv.ssb_flags, SSB_AUTOSIZE);
1541 atomic_set_int(&so->so_snd.ssb_flags, SSB_AUTOSIZE);
6ca1a1cd 1542 cpu = mycpu->gd_cpuid;
0ce0603e
MD
1543
1544 /*
1545 * Set the default port for protocol processing. This will likely
1546 * change when we connect.
1547 */
6ca1a1cd 1548 error = in_pcballoc(so, &tcbinfo[cpu]);
984263bc
MD
1549 if (error)
1550 return (error);
ed894f8c 1551 inp = so->so_pcb;
984263bc
MD
1552#ifdef INET6
1553 if (isipv6) {
1554 inp->inp_vflag |= INP_IPV6;
1555 inp->in6p_hops = -1; /* use kernel default */
1556 }
1557 else
1558#endif
1559 inp->inp_vflag |= INP_IPV4;
1560 tp = tcp_newtcpcb(inp);
6cef7136
MD
1561 if (tp == NULL) {
1562 /*
1563 * Make sure the socket is destroyed by the pcbdetach.
1564 */
1565 soreference(so);
984263bc
MD
1566#ifdef INET6
1567 if (isipv6)
1568 in6_pcbdetach(inp);
1569 else
1570#endif
1571 in_pcbdetach(inp);
6cef7136 1572 sofree(so); /* from ref above */
984263bc
MD
1573 return (ENOBUFS);
1574 }
1575 tp->t_state = TCPS_CLOSED;
1576 return (0);
1577}
1578
1579/*
1580 * Initiate (or continue) disconnect.
1581 * If embryonic state, just send reset (once).
1582 * If in ``let data drain'' option and linger null, just drop.
1583 * Otherwise (hard), mark socket disconnecting and drop
1584 * current input data; switch states based on user close, and
1585 * send segment to peer (with FIN).
1586 */
1587static struct tcpcb *
f3f70f0d 1588tcp_disconnect(struct tcpcb *tp)
984263bc
MD
1589{
1590 struct socket *so = tp->t_inpcb->inp_socket;
1591
6cef7136 1592 if (tp->t_state < TCPS_ESTABLISHED) {
984263bc 1593 tp = tcp_close(tp);
6cef7136 1594 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
984263bc 1595 tp = tcp_drop(tp, 0);
6cef7136
MD
1596 } else {
1597 lwkt_gettoken(&so->so_rcv.ssb_token);
984263bc 1598 soisdisconnecting(so);
6d49aa6f 1599 sbflush(&so->so_rcv.sb);
984263bc
MD
1600 tp = tcp_usrclosed(tp);
1601 if (tp)
f23061d4 1602 tcp_output(tp);
6cef7136 1603 lwkt_reltoken(&so->so_rcv.ssb_token);
984263bc
MD
1604 }
1605 return (tp);
1606}
1607
1608/*
1609 * User issued close, and wish to trail through shutdown states:
1610 * if never received SYN, just forget it. If got a SYN from peer,
1611 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
1612 * If already got a FIN from peer, then almost done; go to LAST_ACK
1613 * state. In all other cases, have already sent FIN to peer (e.g.
1614 * after PRU_SHUTDOWN), and just have to play tedious game waiting
1615 * for peer to send FIN or not respond to keep-alives, etc.
1616 * We can let the user exit from the close as soon as the FIN is acked.
1617 */
1618static struct tcpcb *
f3f70f0d 1619tcp_usrclosed(struct tcpcb *tp)
984263bc
MD
1620{
1621
1622 switch (tp->t_state) {
1623
1624 case TCPS_CLOSED:
1625 case TCPS_LISTEN:
1626 tp->t_state = TCPS_CLOSED;
1627 tp = tcp_close(tp);
1628 break;
1629
1630 case TCPS_SYN_SENT:
1631 case TCPS_SYN_RECEIVED:
1632 tp->t_flags |= TF_NEEDFIN;
1633 break;
1634
1635 case TCPS_ESTABLISHED:
1636 tp->t_state = TCPS_FIN_WAIT_1;
1637 break;
1638
1639 case TCPS_CLOSE_WAIT:
1640 tp->t_state = TCPS_LAST_ACK;
1641 break;
1642 }
1643 if (tp && tp->t_state >= TCPS_FIN_WAIT_2) {
1644 soisdisconnected(tp->t_inpcb->inp_socket);
1645 /* To prevent the connection hanging in FIN_WAIT_2 forever. */
a48c5dd5 1646 if (tp->t_state == TCPS_FIN_WAIT_2) {
5d61ded3 1647 tcp_callout_reset(tp, tp->tt_2msl, tp->t_maxidle,
a48c5dd5
SZ
1648 tcp_timer_2msl);
1649 }
984263bc
MD
1650 }
1651 return (tp);
1652}