socket: Replicate soreceive() to sorecvtcp() for cleanup and optimization
[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
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>
89#include <sys/protosw.h>
90
1cae611f 91#include <sys/thread2.h>
7fe56515 92#include <sys/msgport2.h>
6cef7136 93#include <sys/socketvar2.h>
7fe56515 94
984263bc 95#include <net/if.h>
7fe56515 96#include <net/netisr.h>
984263bc
MD
97#include <net/route.h>
98
4599cf19
MD
99#include <net/netmsg2.h>
100
984263bc
MD
101#include <netinet/in.h>
102#include <netinet/in_systm.h>
103#ifdef INET6
104#include <netinet/ip6.h>
105#endif
106#include <netinet/in_pcb.h>
107#ifdef INET6
108#include <netinet6/in6_pcb.h>
109#endif
110#include <netinet/in_var.h>
111#include <netinet/ip_var.h>
112#ifdef INET6
113#include <netinet6/ip6_var.h>
65f3e756 114#include <netinet6/tcp6_var.h>
984263bc
MD
115#endif
116#include <netinet/tcp.h>
117#include <netinet/tcp_fsm.h>
118#include <netinet/tcp_seq.h>
119#include <netinet/tcp_timer.h>
a48c5dd5 120#include <netinet/tcp_timer2.h>
984263bc
MD
121#include <netinet/tcp_var.h>
122#include <netinet/tcpip.h>
123#ifdef TCPDEBUG
124#include <netinet/tcp_debug.h>
125#endif
126
127#ifdef IPSEC
128#include <netinet6/ipsec.h>
129#endif /*IPSEC*/
130
131/*
132 * TCP protocol interface to socket abstraction.
133 */
134extern char *tcpstates[]; /* XXX ??? */
135
e4700d00 136static int tcp_attach (struct socket *, struct pru_attach_info *);
002c1265 137static void tcp_connect (netmsg_t msg);
984263bc 138#ifdef INET6
002c1265
MD
139static void tcp6_connect (netmsg_t msg);
140static int tcp6_connect_oncpu(struct tcpcb *tp, int flags,
141 struct mbuf **mp,
48e7b118 142 struct sockaddr_in6 *sin6,
65f3e756 143 struct in6_addr *addr6);
984263bc
MD
144#endif /* INET6 */
145static struct tcpcb *
42a7fc75 146 tcp_disconnect (struct tcpcb *);
984263bc 147static struct tcpcb *
42a7fc75 148 tcp_usrclosed (struct tcpcb *);
984263bc
MD
149
150#ifdef TCPDEBUG
151#define TCPDEBUG0 int ostate = 0
152#define TCPDEBUG1() ostate = tp ? tp->t_state : 0
153#define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \
154 tcp_trace(TA_USER, ostate, tp, 0, 0, req)
155#else
156#define TCPDEBUG0
157#define TCPDEBUG1()
158#define TCPDEBUG2(req)
159#endif
160
f12e9fad 161static int tcp_lport_extension = 1;
db26865d
SZ
162SYSCTL_INT(_net_inet_tcp, OID_AUTO, lportext, CTLFLAG_RW,
163 &tcp_lport_extension, 0, "");
164
984263bc 165/*
3533a183
SZ
166 * For some ill optimized programs, which try to use TCP_NOPUSH
167 * to improve performance, will have small amount of data sits
168 * in the sending buffer. These small amount of data will _not_
169 * be pushed into the network until more data are written into
170 * the socket or the socket write side is shutdown.
171 */
172static int tcp_disable_nopush = 1;
173SYSCTL_INT(_net_inet_tcp, OID_AUTO, disable_nopush, CTLFLAG_RW,
174 &tcp_disable_nopush, 0, "TCP_NOPUSH socket option will have no effect");
175
176/*
984263bc 177 * TCP attaches to socket via pru_attach(), reserving space,
0ce0603e
MD
178 * and an internet control block. This is likely occuring on
179 * cpu0 and may have to move later when we bind/connect.
984263bc 180 */
002c1265
MD
181static void
182tcp_usr_attach(netmsg_t msg)
984263bc 183{
002c1265
MD
184 struct socket *so = msg->base.nm_so;
185 struct pru_attach_info *ai = msg->attach.nm_ai;
984263bc 186 int error;
1cae611f 187 struct inpcb *inp;
4090d6ff 188 struct tcpcb *tp = NULL;
984263bc
MD
189 TCPDEBUG0;
190
6cef7136 191 soreference(so);
1cae611f 192 inp = so->so_pcb;
984263bc
MD
193 TCPDEBUG1();
194 if (inp) {
195 error = EISCONN;
196 goto out;
197 }
198
e4700d00 199 error = tcp_attach(so, ai);
984263bc
MD
200 if (error)
201 goto out;
202
203 if ((so->so_options & SO_LINGER) && so->so_linger == 0)
204 so->so_linger = TCP_LINGERTIME;
205 tp = sototcpcb(so);
206out:
6cef7136 207 sofree(so); /* from ref above */
984263bc 208 TCPDEBUG2(PRU_ATTACH);
002c1265 209 lwkt_replymsg(&msg->lmsg, error);
984263bc
MD
210}
211
212/*
213 * pru_detach() detaches the TCP protocol from the socket.
214 * If the protocol state is non-embryonic, then can't
215 * do this directly: have to initiate a pru_disconnect(),
216 * which may finish later; embryonic TCB's can just
217 * be discarded here.
218 */
002c1265
MD
219static void
220tcp_usr_detach(netmsg_t msg)
984263bc 221{
002c1265 222 struct socket *so = msg->base.nm_so;
984263bc 223 int error = 0;
1cae611f 224 struct inpcb *inp;
984263bc
MD
225 struct tcpcb *tp;
226 TCPDEBUG0;
227
1cae611f 228 inp = so->so_pcb;
69891757
MD
229
230 /*
231 * If the inp is already detached it may have been due to an async
232 * close. Just return as if no error occured.
002c1265 233 *
621989fd
MD
234 * It's possible for the tcpcb (tp) to disconnect from the inp due
235 * to tcp_drop()->tcp_close() being called. This may occur *after*
236 * the detach message has been queued so we may find a NULL tp here.
237 */
002c1265
MD
238 if (inp) {
239 if ((tp = intotcpcb(inp)) != NULL) {
240 TCPDEBUG1();
241 tp = tcp_disconnect(tp);
242 TCPDEBUG2(PRU_DETACH);
243 }
621989fd 244 }
002c1265 245 lwkt_replymsg(&msg->lmsg, error);
984263bc
MD
246}
247
69891757 248/*
002c1265 249 * NOTE: ignore_error is non-zero for certain disconnection races
69891757
MD
250 * which we want to silently allow, otherwise close() may return
251 * an unexpected error.
002c1265
MD
252 *
253 * NOTE: The variables (msg) and (tp) are assumed.
69891757
MD
254 */
255#define COMMON_START(so, inp, ignore_error) \
002c1265
MD
256 TCPDEBUG0; \
257 \
258 inp = so->so_pcb; \
259 do { \
69891757 260 if (inp == NULL) { \
002c1265
MD
261 error = ignore_error ? 0 : EINVAL; \
262 tp = NULL; \
263 goto out; \
69891757
MD
264 } \
265 tp = intotcpcb(inp); \
266 TCPDEBUG1(); \
267 } while(0)
f23061d4 268
0ad8e15e 269#define COMMON_END1(req, noreply) \
002c1265
MD
270 out: do { \
271 TCPDEBUG2(req); \
0ad8e15e
SZ
272 if (!(noreply)) \
273 lwkt_replymsg(&msg->lmsg, error); \
002c1265
MD
274 return; \
275 } while(0)
984263bc 276
0ad8e15e
SZ
277#define COMMON_END(req) COMMON_END1((req), 0)
278
984263bc
MD
279/*
280 * Give the socket an address.
281 */
002c1265
MD
282static void
283tcp_usr_bind(netmsg_t msg)
984263bc 284{
002c1265
MD
285 struct socket *so = msg->bind.base.nm_so;
286 struct sockaddr *nam = msg->bind.nm_nam;
287 struct thread *td = msg->bind.nm_td;
984263bc 288 int error = 0;
1cae611f 289 struct inpcb *inp;
984263bc
MD
290 struct tcpcb *tp;
291 struct sockaddr_in *sinp;
292
69891757 293 COMMON_START(so, inp, 0);
984263bc
MD
294
295 /*
296 * Must check for multicast addresses and disallow binding
297 * to them.
298 */
299 sinp = (struct sockaddr_in *)nam;
300 if (sinp->sin_family == AF_INET &&
301 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
302 error = EAFNOSUPPORT;
303 goto out;
304 }
dadab5e9 305 error = in_pcbbind(inp, nam, td);
984263bc
MD
306 if (error)
307 goto out;
308 COMMON_END(PRU_BIND);
309
310}
311
312#ifdef INET6
002c1265
MD
313
314static void
315tcp6_usr_bind(netmsg_t msg)
984263bc 316{
002c1265
MD
317 struct socket *so = msg->bind.base.nm_so;
318 struct sockaddr *nam = msg->bind.nm_nam;
319 struct thread *td = msg->bind.nm_td;
984263bc 320 int error = 0;
1cae611f 321 struct inpcb *inp;
984263bc
MD
322 struct tcpcb *tp;
323 struct sockaddr_in6 *sin6p;
324
69891757 325 COMMON_START(so, inp, 0);
984263bc
MD
326
327 /*
328 * Must check for multicast addresses and disallow binding
329 * to them.
330 */
331 sin6p = (struct sockaddr_in6 *)nam;
332 if (sin6p->sin6_family == AF_INET6 &&
333 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
334 error = EAFNOSUPPORT;
335 goto out;
336 }
337 inp->inp_vflag &= ~INP_IPV4;
338 inp->inp_vflag |= INP_IPV6;
339 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
340 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr))
341 inp->inp_vflag |= INP_IPV4;
342 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
343 struct sockaddr_in sin;
344
345 in6_sin6_2_sin(&sin, sin6p);
346 inp->inp_vflag |= INP_IPV4;
347 inp->inp_vflag &= ~INP_IPV6;
dadab5e9 348 error = in_pcbbind(inp, (struct sockaddr *)&sin, td);
984263bc
MD
349 goto out;
350 }
351 }
dadab5e9 352 error = in6_pcbbind(inp, nam, td);
984263bc
MD
353 if (error)
354 goto out;
355 COMMON_END(PRU_BIND);
356}
357#endif /* INET6 */
358
8affadf8 359#ifdef SMP
002c1265 360
8affadf8 361struct netmsg_inswildcard {
002c1265 362 struct netmsg_base base;
8affadf8 363 struct inpcb *nm_inp;
8affadf8
JH
364};
365
4599cf19 366static void
002c1265 367in_pcbinswildcardhash_handler(netmsg_t msg)
8affadf8 368{
002c1265 369 struct netmsg_inswildcard *nm = (struct netmsg_inswildcard *)msg;
8f9b2aed 370 int cpu = mycpuid, nextcpu;
8affadf8 371
8f9b2aed
SZ
372 in_pcbinswildcardhash_oncpu(nm->nm_inp, &tcbinfo[cpu]);
373
374 nextcpu = cpu + 1;
375 if (nextcpu < ncpus2)
376 lwkt_forwardmsg(cpu_portfn(nextcpu), &nm->base.lmsg);
377 else
378 lwkt_replymsg(&nm->base.lmsg, 0);
8affadf8 379}
002c1265 380
8affadf8
JH
381#endif
382
984263bc
MD
383/*
384 * Prepare to accept connections.
385 */
002c1265
MD
386static void
387tcp_usr_listen(netmsg_t msg)
984263bc 388{
002c1265
MD
389 struct socket *so = msg->listen.base.nm_so;
390 struct thread *td = msg->listen.nm_td;
984263bc 391 int error = 0;
1cae611f 392 struct inpcb *inp;
984263bc 393 struct tcpcb *tp;
8affadf8 394#ifdef SMP
8f9b2aed 395 struct netmsg_inswildcard nm;
8affadf8 396#endif
984263bc 397
69891757 398 COMMON_START(so, inp, 0);
f7b29de5
SZ
399
400 if (tp->t_flags & TF_LISTEN)
401 goto out;
402
8affadf8
JH
403 if (inp->inp_lport == 0) {
404 error = in_pcbbind(inp, NULL, td);
88d239e0 405 if (error)
8affadf8
JH
406 goto out;
407 }
408
409 tp->t_state = TCPS_LISTEN;
f7b29de5 410 tp->t_flags |= TF_LISTEN;
0f758523 411 tp->tt_msg = NULL; /* Catch any invalid timer usage */
8f9b2aed 412
8affadf8 413#ifdef SMP
985b2cb0
MD
414 if (ncpus > 1) {
415 /*
416 * We have to set the flag because we can't have other cpus
417 * messing with our inp's flags.
418 */
f78f8f4a 419 KASSERT(!(inp->inp_flags & INP_CONNECTED),
ed20d0e3 420 ("already on connhash"));
f78f8f4a 421 KASSERT(!(inp->inp_flags & INP_WILDCARD),
ed20d0e3 422 ("already on wildcardhash"));
f78f8f4a 423 KASSERT(!(inp->inp_flags & INP_WILDCARD_MP),
ed20d0e3 424 ("already on MP wildcardhash"));
985b2cb0
MD
425 inp->inp_flags |= INP_WILDCARD_MP;
426
427 KKASSERT(so->so_port == cpu_portfn(0));
428 KKASSERT(&curthread->td_msgport == cpu_portfn(0));
429 KKASSERT(inp->inp_pcbinfo == &tcbinfo[0]);
430
431 netmsg_init(&nm.base, NULL, &curthread->td_msgport,
432 MSGF_PRIORITY, in_pcbinswildcardhash_handler);
433 nm.nm_inp = inp;
434 lwkt_domsg(cpu_portfn(1), &nm.base.lmsg, 0);
435 }
8affadf8 436#endif
8f9b2aed 437 in_pcbinswildcardhash(inp);
984263bc
MD
438 COMMON_END(PRU_LISTEN);
439}
440
441#ifdef INET6
002c1265
MD
442
443static void
444tcp6_usr_listen(netmsg_t msg)
984263bc 445{
002c1265
MD
446 struct socket *so = msg->listen.base.nm_so;
447 struct thread *td = msg->listen.nm_td;
984263bc 448 int error = 0;
1cae611f 449 struct inpcb *inp;
984263bc 450 struct tcpcb *tp;
00638fa3 451#ifdef SMP
8f9b2aed 452 struct netmsg_inswildcard nm;
00638fa3 453#endif
984263bc 454
69891757 455 COMMON_START(so, inp, 0);
f7b29de5
SZ
456
457 if (tp->t_flags & TF_LISTEN)
458 goto out;
459
984263bc 460 if (inp->inp_lport == 0) {
00638fa3 461 if (!(inp->inp_flags & IN6P_IPV6_V6ONLY))
984263bc 462 inp->inp_vflag |= INP_IPV4;
00638fa3
JH
463 else
464 inp->inp_vflag &= ~INP_IPV4;
60233e58 465 error = in6_pcbbind(inp, NULL, td);
88d239e0
SZ
466 if (error)
467 goto out;
984263bc 468 }
88d239e0
SZ
469
470 tp->t_state = TCPS_LISTEN;
f7b29de5 471 tp->t_flags |= TF_LISTEN;
88d239e0
SZ
472 tp->tt_msg = NULL; /* Catch any invalid timer usage */
473
00638fa3 474#ifdef SMP
985b2cb0
MD
475 if (ncpus > 1) {
476 /*
477 * We have to set the flag because we can't have other cpus
478 * messing with our inp's flags.
479 */
f78f8f4a 480 KASSERT(!(inp->inp_flags & INP_CONNECTED),
ed20d0e3 481 ("already on connhash"));
f78f8f4a 482 KASSERT(!(inp->inp_flags & INP_WILDCARD),
ed20d0e3 483 ("already on wildcardhash"));
f78f8f4a 484 KASSERT(!(inp->inp_flags & INP_WILDCARD_MP),
ed20d0e3 485 ("already on MP wildcardhash"));
985b2cb0
MD
486 inp->inp_flags |= INP_WILDCARD_MP;
487
488 KKASSERT(so->so_port == cpu_portfn(0));
489 KKASSERT(&curthread->td_msgport == cpu_portfn(0));
490 KKASSERT(inp->inp_pcbinfo == &tcbinfo[0]);
491
492 netmsg_init(&nm.base, NULL, &curthread->td_msgport,
493 MSGF_PRIORITY, in_pcbinswildcardhash_handler);
494 nm.nm_inp = inp;
495 lwkt_domsg(cpu_portfn(1), &nm.base.lmsg, 0);
496 }
00638fa3 497#endif
8f9b2aed 498 in_pcbinswildcardhash(inp);
984263bc
MD
499 COMMON_END(PRU_LISTEN);
500}
501#endif /* INET6 */
502
503/*
504 * Initiate connection to peer.
505 * Create a template for use in transmissions on this connection.
506 * Enter SYN_SENT state, and mark socket as connecting.
507 * Start keep-alive timer, and seed output sequence space.
508 * Send initial segment on connection.
509 */
002c1265
MD
510static void
511tcp_usr_connect(netmsg_t msg)
984263bc 512{
002c1265
MD
513 struct socket *so = msg->connect.base.nm_so;
514 struct sockaddr *nam = msg->connect.nm_nam;
515 struct thread *td = msg->connect.nm_td;
984263bc 516 int error = 0;
1cae611f 517 struct inpcb *inp;
984263bc
MD
518 struct tcpcb *tp;
519 struct sockaddr_in *sinp;
520
69891757 521 COMMON_START(so, inp, 0);
984263bc
MD
522
523 /*
524 * Must disallow TCP ``connections'' to multicast addresses.
525 */
526 sinp = (struct sockaddr_in *)nam;
527 if (sinp->sin_family == AF_INET
528 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
529 error = EAFNOSUPPORT;
530 goto out;
531 }
532
3e4150ef
VBD
533 if (!prison_remote_ip(td, (struct sockaddr*)sinp)) {
534 error = EAFNOSUPPORT; /* IPv6 only jail */
535 goto out;
536 }
984263bc 537
002c1265
MD
538 tcp_connect(msg);
539 /* msg is invalid now */
540 return;
541out:
542 if (msg->connect.nm_m) {
543 m_freem(msg->connect.nm_m);
544 msg->connect.nm_m = NULL;
545 }
546 lwkt_replymsg(&msg->lmsg, error);
984263bc
MD
547}
548
549#ifdef INET6
002c1265
MD
550
551static void
552tcp6_usr_connect(netmsg_t msg)
984263bc 553{
002c1265
MD
554 struct socket *so = msg->connect.base.nm_so;
555 struct sockaddr *nam = msg->connect.nm_nam;
556 struct thread *td = msg->connect.nm_td;
984263bc 557 int error = 0;
1cae611f 558 struct inpcb *inp;
984263bc
MD
559 struct tcpcb *tp;
560 struct sockaddr_in6 *sin6p;
561
69891757 562 COMMON_START(so, inp, 0);
984263bc
MD
563
564 /*
565 * Must disallow TCP ``connections'' to multicast addresses.
566 */
567 sin6p = (struct sockaddr_in6 *)nam;
568 if (sin6p->sin6_family == AF_INET6
569 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
570 error = EAFNOSUPPORT;
571 goto out;
572 }
573
3e4150ef
VBD
574 if (!prison_remote_ip(td, nam)) {
575 error = EAFNOSUPPORT; /* IPv4 only jail */
576 goto out;
577 }
578
984263bc 579 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
002c1265 580 struct sockaddr_in *sinp;
984263bc
MD
581
582 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
583 error = EINVAL;
584 goto out;
585 }
002c1265
MD
586 sinp = kmalloc(sizeof(*sinp), M_LWKTMSG, M_INTWAIT);
587 in6_sin6_2_sin(sinp, sin6p);
984263bc
MD
588 inp->inp_vflag |= INP_IPV4;
589 inp->inp_vflag &= ~INP_IPV6;
002c1265
MD
590 msg->connect.nm_nam = (struct sockaddr *)sinp;
591 msg->connect.nm_reconnect |= NMSG_RECONNECT_NAMALLOC;
592 tcp_connect(msg);
593 /* msg is invalid now */
594 return;
984263bc
MD
595 }
596 inp->inp_vflag &= ~INP_IPV4;
597 inp->inp_vflag |= INP_IPV6;
598 inp->inp_inc.inc_isipv6 = 1;
002c1265
MD
599
600 msg->connect.nm_reconnect |= NMSG_RECONNECT_FALLBACK;
601 tcp6_connect(msg);
602 /* msg is invalid now */
603 return;
604out:
605 if (msg->connect.nm_m) {
606 m_freem(msg->connect.nm_m);
607 msg->connect.nm_m = NULL;
608 }
609 lwkt_replymsg(&msg->lmsg, error);
984263bc 610}
002c1265 611
984263bc
MD
612#endif /* INET6 */
613
614/*
615 * Initiate disconnect from peer.
616 * If connection never passed embryonic stage, just drop;
617 * else if don't need to let data drain, then can just drop anyways,
618 * else have to begin TCP shutdown process: mark socket disconnecting,
619 * drain unread data, state switch to reflect user close, and
620 * send segment (e.g. FIN) to peer. Socket will be really disconnected
621 * when peer sends FIN and acks ours.
622 *
623 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
624 */
002c1265
MD
625static void
626tcp_usr_disconnect(netmsg_t msg)
984263bc 627{
002c1265 628 struct socket *so = msg->disconnect.base.nm_so;
984263bc 629 int error = 0;
1cae611f 630 struct inpcb *inp;
984263bc
MD
631 struct tcpcb *tp;
632
69891757 633 COMMON_START(so, inp, 1);
984263bc
MD
634 tp = tcp_disconnect(tp);
635 COMMON_END(PRU_DISCONNECT);
636}
637
638/*
639 * Accept a connection. Essentially all the work is
640 * done at higher levels; just return the address
641 * of the peer, storing through addr.
642 */
002c1265
MD
643static void
644tcp_usr_accept(netmsg_t msg)
984263bc 645{
002c1265
MD
646 struct socket *so = msg->accept.base.nm_so;
647 struct sockaddr **nam = msg->accept.nm_nam;
984263bc 648 int error = 0;
1cae611f 649 struct inpcb *inp;
984263bc
MD
650 struct tcpcb *tp = NULL;
651 TCPDEBUG0;
652
1cae611f 653 inp = so->so_pcb;
984263bc
MD
654 if (so->so_state & SS_ISDISCONNECTED) {
655 error = ECONNABORTED;
656 goto out;
657 }
002c1265
MD
658 if (inp == 0) {
659 error = EINVAL;
660 goto out;
661 }
6cef7136 662
984263bc
MD
663 tp = intotcpcb(inp);
664 TCPDEBUG1();
665 in_setpeeraddr(so, nam);
666 COMMON_END(PRU_ACCEPT);
667}
668
669#ifdef INET6
002c1265
MD
670static void
671tcp6_usr_accept(netmsg_t msg)
984263bc 672{
002c1265
MD
673 struct socket *so = msg->accept.base.nm_so;
674 struct sockaddr **nam = msg->accept.nm_nam;
984263bc 675 int error = 0;
1cae611f 676 struct inpcb *inp;
984263bc
MD
677 struct tcpcb *tp = NULL;
678 TCPDEBUG0;
679
1cae611f
MD
680 inp = so->so_pcb;
681
984263bc
MD
682 if (so->so_state & SS_ISDISCONNECTED) {
683 error = ECONNABORTED;
684 goto out;
685 }
002c1265
MD
686 if (inp == 0) {
687 error = EINVAL;
688 goto out;
689 }
984263bc
MD
690 tp = intotcpcb(inp);
691 TCPDEBUG1();
692 in6_mapped_peeraddr(so, nam);
693 COMMON_END(PRU_ACCEPT);
694}
695#endif /* INET6 */
696/*
697 * Mark the connection as being incapable of further output.
698 */
002c1265
MD
699static void
700tcp_usr_shutdown(netmsg_t msg)
984263bc 701{
002c1265 702 struct socket *so = msg->shutdown.base.nm_so;
984263bc 703 int error = 0;
1cae611f 704 struct inpcb *inp;
984263bc
MD
705 struct tcpcb *tp;
706
69891757 707 COMMON_START(so, inp, 0);
984263bc
MD
708 socantsendmore(so);
709 tp = tcp_usrclosed(tp);
710 if (tp)
711 error = tcp_output(tp);
712 COMMON_END(PRU_SHUTDOWN);
713}
714
715/*
716 * After a receive, possibly send window update to peer.
717 */
002c1265
MD
718static void
719tcp_usr_rcvd(netmsg_t msg)
984263bc 720{
002c1265 721 struct socket *so = msg->rcvd.base.nm_so;
984263bc 722 int error = 0;
1cae611f 723 struct inpcb *inp;
984263bc
MD
724 struct tcpcb *tp;
725
69891757 726 COMMON_START(so, inp, 0);
984263bc
MD
727 tcp_output(tp);
728 COMMON_END(PRU_RCVD);
729}
730
731/*
732 * Do a send by putting data in output queue and updating urgent
733 * marker if URG set. Possibly send more data. Unlike the other
734 * pru_*() routines, the mbuf chains are our responsibility. We
735 * must either enqueue them or free them. The other pru_* routines
736 * generally are caller-frees.
737 */
002c1265
MD
738static void
739tcp_usr_send(netmsg_t msg)
984263bc 740{
002c1265
MD
741 struct socket *so = msg->send.base.nm_so;
742 int flags = msg->send.nm_flags;
743 struct mbuf *m = msg->send.nm_m;
984263bc 744 int error = 0;
1cae611f 745 struct inpcb *inp;
984263bc 746 struct tcpcb *tp;
984263bc
MD
747 TCPDEBUG0;
748
7b7dc575
SZ
749 KKASSERT(msg->send.nm_control == NULL);
750 KKASSERT(msg->send.nm_addr == NULL);
751 KKASSERT((flags & PRUS_FREEADDR) == 0);
5bc42dd1 752
1cae611f
MD
753 inp = so->so_pcb;
754
984263bc
MD
755 if (inp == NULL) {
756 /*
757 * OOPS! we lost a race, the TCP session got reset after
758 * we checked SS_CANTSENDMORE, eg: while doing uiomove or a
1cae611f 759 * network interrupt in the non-critical section of sosend().
984263bc 760 */
48e7b118 761 m_freem(m);
984263bc
MD
762 error = ECONNRESET; /* XXX EPIPE? */
763 tp = NULL;
764 TCPDEBUG1();
765 goto out;
766 }
984263bc
MD
767 tp = intotcpcb(inp);
768 TCPDEBUG1();
984263bc 769
8b0272b9
SZ
770#ifdef foo
771 /*
772 * This is no longer necessary, since:
773 * - sosendtcp() has already checked it for us
774 * - It does not work with asynchronized send
775 */
776
48e7b118
MD
777 /*
778 * Don't let too much OOB data build up
779 */
780 if (flags & PRUS_OOB) {
6d49aa6f 781 if (ssb_space(&so->so_snd) < -512) {
984263bc
MD
782 m_freem(m);
783 error = ENOBUFS;
784 goto out;
785 }
48e7b118 786 }
8b0272b9 787#endif
48e7b118
MD
788
789 /*
48e7b118
MD
790 * Pump the data into the socket.
791 */
792 if (m)
793 ssb_appendstream(&so->so_snd, m);
794 if (flags & PRUS_OOB) {
984263bc
MD
795 /*
796 * According to RFC961 (Assigned Protocols),
797 * the urgent pointer points to the last octet
798 * of urgent data. We continue, however,
799 * to consider it to indicate the first octet
800 * of data past the urgent section.
801 * Otherwise, snd_up should be one lower.
802 */
6d49aa6f 803 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc;
c1d3b892 804 tp->t_flags |= TF_FORCE;
984263bc 805 error = tcp_output(tp);
c1d3b892 806 tp->t_flags &= ~TF_FORCE;
48e7b118
MD
807 } else {
808 if (flags & PRUS_EOF) {
809 /*
810 * Close the send side of the connection after
811 * the data is sent.
812 */
813 socantsendmore(so);
814 tp = tcp_usrclosed(tp);
815 }
816 if (tp != NULL) {
817 if (flags & PRUS_MORETOCOME)
818 tp->t_flags |= TF_MORETOCOME;
819 error = tcp_output(tp);
820 if (flags & PRUS_MORETOCOME)
821 tp->t_flags &= ~TF_MORETOCOME;
822 }
984263bc 823 }
0ad8e15e
SZ
824 COMMON_END1((flags & PRUS_OOB) ? PRU_SENDOOB :
825 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND),
826 (flags & PRUS_NOREPLY));
984263bc
MD
827}
828
829/*
6cef7136
MD
830 * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort()
831 * will sofree() it when we return.
984263bc 832 */
002c1265
MD
833static void
834tcp_usr_abort(netmsg_t msg)
984263bc 835{
002c1265 836 struct socket *so = msg->abort.base.nm_so;
984263bc 837 int error = 0;
1cae611f 838 struct inpcb *inp;
984263bc
MD
839 struct tcpcb *tp;
840
69891757 841 COMMON_START(so, inp, 1);
984263bc
MD
842 tp = tcp_drop(tp, ECONNABORTED);
843 COMMON_END(PRU_ABORT);
844}
845
846/*
847 * Receive out-of-band data.
848 */
002c1265
MD
849static void
850tcp_usr_rcvoob(netmsg_t msg)
984263bc 851{
002c1265
MD
852 struct socket *so = msg->rcvoob.base.nm_so;
853 struct mbuf *m = msg->rcvoob.nm_m;
854 int flags = msg->rcvoob.nm_flags;
984263bc 855 int error = 0;
1cae611f 856 struct inpcb *inp;
984263bc
MD
857 struct tcpcb *tp;
858
69891757 859 COMMON_START(so, inp, 0);
984263bc
MD
860 if ((so->so_oobmark == 0 &&
861 (so->so_state & SS_RCVATMARK) == 0) ||
862 so->so_options & SO_OOBINLINE ||
863 tp->t_oobflags & TCPOOB_HADDATA) {
864 error = EINVAL;
865 goto out;
866 }
867 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
868 error = EWOULDBLOCK;
869 goto out;
870 }
871 m->m_len = 1;
872 *mtod(m, caddr_t) = tp->t_iobc;
873 if ((flags & MSG_PEEK) == 0)
874 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
875 COMMON_END(PRU_RCVOOB);
876}
877
88da6203
SZ
878static void
879tcp_usr_savefaddr(struct socket *so, const struct sockaddr *faddr)
880{
881 in_savefaddr(so, faddr);
882}
883
68dc4251
SZ
884#ifdef INET6
885static void
886tcp6_usr_savefaddr(struct socket *so, const struct sockaddr *faddr)
887{
888 in6_mapped_savefaddr(so, faddr);
889}
890#endif
891
984263bc
MD
892/* xxx - should be const */
893struct pr_usrreqs tcp_usrreqs = {
fa5e758c
MD
894 .pru_abort = tcp_usr_abort,
895 .pru_accept = tcp_usr_accept,
896 .pru_attach = tcp_usr_attach,
897 .pru_bind = tcp_usr_bind,
898 .pru_connect = tcp_usr_connect,
002c1265
MD
899 .pru_connect2 = pr_generic_notsupp,
900 .pru_control = in_control_dispatch,
fa5e758c
MD
901 .pru_detach = tcp_usr_detach,
902 .pru_disconnect = tcp_usr_disconnect,
903 .pru_listen = tcp_usr_listen,
002c1265 904 .pru_peeraddr = in_setpeeraddr_dispatch,
fa5e758c
MD
905 .pru_rcvd = tcp_usr_rcvd,
906 .pru_rcvoob = tcp_usr_rcvoob,
907 .pru_send = tcp_usr_send,
908 .pru_sense = pru_sense_null,
909 .pru_shutdown = tcp_usr_shutdown,
002c1265 910 .pru_sockaddr = in_setsockaddr_dispatch,
5bc42dd1 911 .pru_sosend = sosendtcp,
9510c423 912 .pru_soreceive = sorecvtcp,
88da6203 913 .pru_savefaddr = tcp_usr_savefaddr
984263bc
MD
914};
915
916#ifdef INET6
917struct pr_usrreqs tcp6_usrreqs = {
fa5e758c
MD
918 .pru_abort = tcp_usr_abort,
919 .pru_accept = tcp6_usr_accept,
920 .pru_attach = tcp_usr_attach,
921 .pru_bind = tcp6_usr_bind,
922 .pru_connect = tcp6_usr_connect,
002c1265
MD
923 .pru_connect2 = pr_generic_notsupp,
924 .pru_control = in6_control_dispatch,
fa5e758c
MD
925 .pru_detach = tcp_usr_detach,
926 .pru_disconnect = tcp_usr_disconnect,
927 .pru_listen = tcp6_usr_listen,
002c1265 928 .pru_peeraddr = in6_mapped_peeraddr_dispatch,
fa5e758c
MD
929 .pru_rcvd = tcp_usr_rcvd,
930 .pru_rcvoob = tcp_usr_rcvoob,
931 .pru_send = tcp_usr_send,
932 .pru_sense = pru_sense_null,
933 .pru_shutdown = tcp_usr_shutdown,
002c1265 934 .pru_sockaddr = in6_mapped_sockaddr_dispatch,
5bc42dd1 935 .pru_sosend = sosendtcp,
9510c423 936 .pru_soreceive = sorecvtcp,
68dc4251 937 .pru_savefaddr = tcp6_usr_savefaddr
984263bc
MD
938};
939#endif /* INET6 */
940
984263bc 941static int
48e7b118
MD
942tcp_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf *m,
943 struct sockaddr_in *sin, struct sockaddr_in *if_sin)
984263bc
MD
944{
945 struct inpcb *inp = tp->t_inpcb, *oinp;
946 struct socket *so = inp->inp_socket;
03fb1cae 947 struct route *ro = &inp->inp_route;
984263bc 948
7fe56515 949 oinp = in_pcblookup_hash(&tcbinfo[mycpu->gd_cpuid],
002c1265
MD
950 sin->sin_addr, sin->sin_port,
951 (inp->inp_laddr.s_addr != INADDR_ANY ?
952 inp->inp_laddr : if_sin->sin_addr),
953 inp->inp_lport, 0, NULL);
13d8907a 954 if (oinp != NULL) {
27b8aee3
AE
955 m_freem(m);
956 return (EADDRINUSE);
984263bc
MD
957 }
958 if (inp->inp_laddr.s_addr == INADDR_ANY)
13d8907a 959 inp->inp_laddr = if_sin->sin_addr;
984263bc
MD
960 inp->inp_faddr = sin->sin_addr;
961 inp->inp_fport = sin->sin_port;
7fe56515 962 inp->inp_cpcbinfo = &tcbinfo[mycpu->gd_cpuid];
13d8907a 963 in_pcbinsconnhash(inp);
984263bc 964
03fb1cae
SZ
965 /*
966 * We are now on the inpcb's owner CPU, if the cached route was
967 * freed because the rtentry's owner CPU is not the current CPU
968 * (e.g. in tcp_connect()), then we try to reallocate it here with
969 * the hope that a rtentry may be cloned from a RTF_PRCLONING
970 * rtentry.
971 */
972 if (!(inp->inp_socket->so_options & SO_DONTROUTE) && /*XXX*/
973 ro->ro_rt == NULL) {
974 bzero(&ro->ro_dst, sizeof(struct sockaddr_in));
975 ro->ro_dst.sa_family = AF_INET;
976 ro->ro_dst.sa_len = sizeof(struct sockaddr_in);
977 ((struct sockaddr_in *)&ro->ro_dst)->sin_addr =
978 sin->sin_addr;
979 rtalloc(ro);
980 }
981
3db1c8a3 982 /*
48e7b118
MD
983 * Now that no more errors can occur, change the protocol processing
984 * port to the current thread (which is the correct thread).
985 *
3db1c8a3
SZ
986 * Create TCP timer message now; we are on the tcpcb's owner
987 * CPU/thread.
988 */
989 tcp_create_timermsg(tp, &curthread->td_msgport);
0f758523 990
46e92930
MD
991 /*
992 * Compute window scaling to request. Use a larger scaling then
993 * needed for the initial receive buffer in case the receive buffer
994 * gets expanded.
995 */
996 if (tp->request_r_scale < TCP_MIN_WINSHIFT)
997 tp->request_r_scale = TCP_MIN_WINSHIFT;
984263bc 998 while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
46e92930
MD
999 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat
1000 ) {
984263bc 1001 tp->request_r_scale++;
46e92930 1002 }
984263bc
MD
1003
1004 soisconnecting(so);
1005 tcpstat.tcps_connattempt++;
1006 tp->t_state = TCPS_SYN_SENT;
2ce132be 1007 tcp_callout_reset(tp, tp->tt_keep, tp->t_keepinit, tcp_timer_keep);
984263bc 1008 tp->iss = tcp_new_isn(tp);
984263bc 1009 tcp_sendseqinit(tp);
48e7b118
MD
1010 if (m) {
1011 ssb_appendstream(&so->so_snd, m);
1012 m = NULL;
1013 if (flags & PRUS_OOB)
1014 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc;
1015 }
984263bc
MD
1016
1017 /*
48e7b118
MD
1018 * Close the send side of the connection after
1019 * the data is sent if flagged.
1020 */
1021 if ((flags & (PRUS_OOB|PRUS_EOF)) == PRUS_EOF) {
1022 socantsendmore(so);
1023 tp = tcp_usrclosed(tp);
1024 }
1025 return (tcp_output(tp));
984263bc
MD
1026}
1027
7fe56515
JH
1028/*
1029 * Common subroutine to open a TCP connection to remote host specified
1030 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local
1031 * port number if needed. Call in_pcbladdr to do the routing and to choose
27b8aee3 1032 * a local host address (interface).
7fe56515
JH
1033 * Initialize connection parameters and enter SYN-SENT state.
1034 */
002c1265
MD
1035static void
1036tcp_connect(netmsg_t msg)
7fe56515 1037{
002c1265
MD
1038 struct socket *so = msg->connect.base.nm_so;
1039 struct sockaddr *nam = msg->connect.nm_nam;
1040 struct thread *td = msg->connect.nm_td;
7fe56515
JH
1041 struct sockaddr_in *sin = (struct sockaddr_in *)nam;
1042 struct sockaddr_in *if_sin;
002c1265
MD
1043 struct inpcb *inp;
1044 struct tcpcb *tp;
4fd40da5 1045 int error, calc_laddr = 1;
540a0bf0 1046#ifdef SMP
7fe56515
JH
1047 lwkt_port_t port;
1048#endif
1049
002c1265
MD
1050 COMMON_START(so, inp, 0);
1051
1052 /*
1053 * Reconnect our pcb if we have to
1054 */
1055 if (msg->connect.nm_reconnect & NMSG_RECONNECT_RECONNECT) {
1056 msg->connect.nm_reconnect &= ~NMSG_RECONNECT_RECONNECT;
1057 in_pcblink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1058 }
1059
9c7b7c43
SZ
1060 /*
1061 * Bind if we have to
1062 */
1063 if (inp->inp_lport == 0) {
1064 if (tcp_lport_extension) {
db26865d
SZ
1065 KKASSERT(inp->inp_laddr.s_addr == INADDR_ANY);
1066
1067 error = in_pcbladdr(inp, nam, &if_sin, td);
1068 if (error)
1069 goto out;
1070 inp->inp_laddr.s_addr = if_sin->sin_addr.s_addr;
1071
1072 error = in_pcbconn_bind(inp, nam, td);
1073 if (error)
1074 goto out;
4fd40da5
SZ
1075
1076 calc_laddr = 0;
9c7b7c43 1077 } else {
db26865d
SZ
1078 error = in_pcbbind(inp, NULL, td);
1079 if (error)
1080 goto out;
1081 }
4fd40da5 1082 }
db26865d 1083
4fd40da5 1084 if (calc_laddr) {
db26865d
SZ
1085 /*
1086 * Calculate the correct protocol processing thread. The
1087 * connect operation must run there. Set the forwarding
1088 * port before we forward the message or it will get bounced
1089 * right back to us.
1090 */
1091 error = in_pcbladdr(inp, nam, &if_sin, td);
002c1265
MD
1092 if (error)
1093 goto out;
7fe56515 1094 }
b25d27f4
SZ
1095 KKASSERT(inp->inp_socket == so);
1096
540a0bf0 1097#ifdef SMP
7fe56515 1098 port = tcp_addrport(sin->sin_addr.s_addr, sin->sin_port,
002c1265
MD
1099 (inp->inp_laddr.s_addr ?
1100 inp->inp_laddr.s_addr : if_sin->sin_addr.s_addr),
1101 inp->inp_lport);
7fe56515 1102
fb0f29c4 1103 if (port != &curthread->td_msgport) {
a46456f3
SZ
1104 struct route *ro = &inp->inp_route;
1105
1106 /*
1107 * in_pcbladdr() may have allocated a route entry for us
1108 * on the current CPU, but we need a route entry on the
03fb1cae 1109 * inpcb's owner CPU, so free it here.
a46456f3
SZ
1110 */
1111 if (ro->ro_rt != NULL)
1112 RTFREE(ro->ro_rt);
1113 bzero(ro, sizeof(*ro));
540a0bf0 1114
48e7b118 1115 /*
0ce0603e
MD
1116 * We are moving the protocol processing port the socket
1117 * is on, we have to unlink here and re-link on the
1118 * target cpu.
48e7b118 1119 */
0ce0603e
MD
1120 in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1121 sosetport(so, port);
002c1265
MD
1122 msg->connect.nm_reconnect |= NMSG_RECONNECT_RECONNECT;
1123 msg->connect.base.nm_dispatch = tcp_connect;
0ce0603e 1124
002c1265
MD
1125 lwkt_forwardmsg(port, &msg->connect.base.lmsg);
1126 /* msg invalid now */
1127 return;
48e7b118
MD
1128 }
1129#else
0ce0603e 1130 KKASSERT(so->so_port == &curthread->td_msgport);
7fe56515 1131#endif
002c1265
MD
1132 error = tcp_connect_oncpu(tp, msg->connect.nm_flags,
1133 msg->connect.nm_m, sin, if_sin);
1134 msg->connect.nm_m = NULL;
1135out:
1136 if (msg->connect.nm_m) {
1137 m_freem(msg->connect.nm_m);
1138 msg->connect.nm_m = NULL;
1139 }
1140 if (msg->connect.nm_reconnect & NMSG_RECONNECT_NAMALLOC) {
1141 kfree(msg->connect.nm_nam, M_LWKTMSG);
1142 msg->connect.nm_nam = NULL;
1143 }
1144 lwkt_replymsg(&msg->connect.base.lmsg, error);
1145 /* msg invalid now */
7fe56515
JH
1146}
1147
984263bc 1148#ifdef INET6
65f3e756 1149
002c1265
MD
1150static void
1151tcp6_connect(netmsg_t msg)
984263bc 1152{
002c1265
MD
1153 struct tcpcb *tp;
1154 struct socket *so = msg->connect.base.nm_so;
1155 struct sockaddr *nam = msg->connect.nm_nam;
1156 struct thread *td = msg->connect.nm_td;
1157 struct inpcb *inp;
984263bc
MD
1158 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
1159 struct in6_addr *addr6;
f890e67a 1160#ifdef SMP
65f3e756 1161 lwkt_port_t port;
f890e67a 1162#endif
984263bc
MD
1163 int error;
1164
002c1265
MD
1165 COMMON_START(so, inp, 0);
1166
1167 /*
1168 * Reconnect our pcb if we have to
1169 */
1170 if (msg->connect.nm_reconnect & NMSG_RECONNECT_RECONNECT) {
1171 msg->connect.nm_reconnect &= ~NMSG_RECONNECT_RECONNECT;
1172 in_pcblink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1173 }
1174
1175 /*
1176 * Bind if we have to
1177 */
984263bc 1178 if (inp->inp_lport == 0) {
60233e58 1179 error = in6_pcbbind(inp, NULL, td);
002c1265
MD
1180 if (error)
1181 goto out;
984263bc
MD
1182 }
1183
1184 /*
1185 * Cannot simply call in_pcbconnect, because there might be an
1186 * earlier incarnation of this same connection still in
1187 * TIME_WAIT state, creating an ADDRINUSE error.
1188 */
3e4150ef 1189 error = in6_pcbladdr(inp, nam, &addr6, td);
002c1265
MD
1190 if (error)
1191 goto out;
65f3e756
MD
1192
1193#ifdef SMP
1194 port = tcp6_addrport(); /* XXX hack for now, always cpu0 */
1195
1196 if (port != &curthread->td_msgport) {
65f3e756
MD
1197 struct route *ro = &inp->inp_route;
1198
1199 /*
1200 * in_pcbladdr() may have allocated a route entry for us
1201 * on the current CPU, but we need a route entry on the
1202 * inpcb's owner CPU, so free it here.
1203 */
1204 if (ro->ro_rt != NULL)
1205 RTFREE(ro->ro_rt);
1206 bzero(ro, sizeof(*ro));
1207
002c1265
MD
1208 in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1209 sosetport(so, port);
1210 msg->connect.nm_reconnect |= NMSG_RECONNECT_RECONNECT;
1211 msg->connect.base.nm_dispatch = tcp6_connect;
1212
1213 lwkt_forwardmsg(port, &msg->connect.base.lmsg);
1214 /* msg invalid now */
1215 return;
48e7b118 1216 }
65f3e756 1217#endif
002c1265
MD
1218 error = tcp6_connect_oncpu(tp, msg->connect.nm_flags,
1219 &msg->connect.nm_m, sin6, addr6);
1220 /* nm_m may still be intact */
1221out:
1222 if (error && (msg->connect.nm_reconnect & NMSG_RECONNECT_FALLBACK)) {
1223 tcp_connect(msg);
1224 /* msg invalid now */
1225 } else {
1226 if (msg->connect.nm_m) {
1227 m_freem(msg->connect.nm_m);
1228 msg->connect.nm_m = NULL;
1229 }
1230 if (msg->connect.nm_reconnect & NMSG_RECONNECT_NAMALLOC) {
1231 kfree(msg->connect.nm_nam, M_LWKTMSG);
1232 msg->connect.nm_nam = NULL;
1233 }
1234 lwkt_replymsg(&msg->connect.base.lmsg, error);
1235 /* msg invalid now */
1236 }
65f3e756
MD
1237}
1238
1239static int
002c1265 1240tcp6_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf **mp,
48e7b118 1241 struct sockaddr_in6 *sin6, struct in6_addr *addr6)
65f3e756 1242{
002c1265 1243 struct mbuf *m = *mp;
65f3e756
MD
1244 struct inpcb *inp = tp->t_inpcb;
1245 struct socket *so = inp->inp_socket;
1246 struct inpcb *oinp;
65f3e756 1247
48e7b118
MD
1248 /*
1249 * Cannot simply call in_pcbconnect, because there might be an
1250 * earlier incarnation of this same connection still in
1251 * TIME_WAIT state, creating an ADDRINUSE error.
1252 */
7fe56515 1253 oinp = in6_pcblookup_hash(inp->inp_cpcbinfo,
984263bc 1254 &sin6->sin6_addr, sin6->sin6_port,
002c1265
MD
1255 (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) ?
1256 addr6 : &inp->in6p_laddr),
984263bc 1257 inp->inp_lport, 0, NULL);
002c1265 1258 if (oinp)
27b8aee3 1259 return (EADDRINUSE);
002c1265 1260
984263bc
MD
1261 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
1262 inp->in6p_laddr = *addr6;
1263 inp->in6p_faddr = sin6->sin6_addr;
1264 inp->inp_fport = sin6->sin6_port;
3641b7ca 1265 if ((sin6->sin6_flowinfo & IPV6_FLOWINFO_MASK) != 0)
984263bc 1266 inp->in6p_flowinfo = sin6->sin6_flowinfo;
13d8907a 1267 in_pcbinsconnhash(inp);
984263bc 1268
48e7b118
MD
1269 /*
1270 * Now that no more errors can occur, change the protocol processing
1271 * port to the current thread (which is the correct thread).
1272 *
1273 * Create TCP timer message now; we are on the tcpcb's owner
1274 * CPU/thread.
1275 */
3db1c8a3
SZ
1276 tcp_create_timermsg(tp, &curthread->td_msgport);
1277
984263bc 1278 /* Compute window scaling to request. */
46e92930
MD
1279 if (tp->request_r_scale < TCP_MIN_WINSHIFT)
1280 tp->request_r_scale = TCP_MIN_WINSHIFT;
984263bc 1281 while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
46e92930 1282 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat) {
984263bc 1283 tp->request_r_scale++;
46e92930 1284 }
984263bc
MD
1285
1286 soisconnecting(so);
1287 tcpstat.tcps_connattempt++;
1288 tp->t_state = TCPS_SYN_SENT;
2ce132be 1289 tcp_callout_reset(tp, tp->tt_keep, tp->t_keepinit, tcp_timer_keep);
984263bc 1290 tp->iss = tcp_new_isn(tp);
984263bc 1291 tcp_sendseqinit(tp);
48e7b118
MD
1292 if (m) {
1293 ssb_appendstream(&so->so_snd, m);
002c1265 1294 *mp = NULL;
48e7b118
MD
1295 if (flags & PRUS_OOB)
1296 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc;
1297 }
984263bc
MD
1298
1299 /*
48e7b118
MD
1300 * Close the send side of the connection after
1301 * the data is sent if flagged.
1302 */
1303 if ((flags & (PRUS_OOB|PRUS_EOF)) == PRUS_EOF) {
1304 socantsendmore(so);
1305 tp = tcp_usrclosed(tp);
1306 }
1307 return (tcp_output(tp));
984263bc 1308}
65f3e756 1309
984263bc
MD
1310#endif /* INET6 */
1311
1312/*
1313 * The new sockopt interface makes it possible for us to block in the
1cae611f
MD
1314 * copyin/out step (if we take a page fault). Taking a page fault while
1315 * in a critical section is probably a Bad Thing. (Since sockets and pcbs
1316 * both now use TSM, there probably isn't any need for this function to
1317 * run in a critical section any more. This needs more examination.)
984263bc 1318 */
002c1265
MD
1319void
1320tcp_ctloutput(netmsg_t msg)
984263bc 1321{
002c1265
MD
1322 struct socket *so = msg->base.nm_so;
1323 struct sockopt *sopt = msg->ctloutput.nm_sopt;
2ce132be 1324 int error, opt, optval, opthz;
984263bc
MD
1325 struct inpcb *inp;
1326 struct tcpcb *tp;
1327
1328 error = 0;
ed894f8c 1329 inp = so->so_pcb;
002c1265
MD
1330 if (inp == NULL) {
1331 error = ECONNRESET;
1332 goto done;
1333 }
6cef7136 1334
984263bc
MD
1335 if (sopt->sopt_level != IPPROTO_TCP) {
1336#ifdef INET6
1337 if (INP_CHECK_SOCKAF(so, AF_INET6))
002c1265 1338 ip6_ctloutput_dispatch(msg);
984263bc
MD
1339 else
1340#endif /* INET6 */
002c1265
MD
1341 ip_ctloutput(msg);
1342 /* msg invalid now */
1343 return;
984263bc
MD
1344 }
1345 tp = intotcpcb(inp);
1346
1347 switch (sopt->sopt_dir) {
1348 case SOPT_SET:
e71a125f
AE
1349 error = soopt_to_kbuf(sopt, &optval, sizeof optval,
1350 sizeof optval);
1351 if (error)
1352 break;
984263bc 1353 switch (sopt->sopt_name) {
2a0c7c52 1354 case TCP_FASTKEEP:
fb8d5c6d
SZ
1355 if (optval > 0)
1356 tp->t_keepidle = tp->t_keepintvl;
1357 else
1358 tp->t_keepidle = tcp_keepidle;
1359 tcp_timer_keep_activity(tp, 0);
2a0c7c52 1360 break;
b1992928
MD
1361#ifdef TCP_SIGNATURE
1362 case TCP_SIGNATURE_ENABLE:
d0be4e27
SZ
1363 if (tp->t_state == TCPS_CLOSED) {
1364 /*
1365 * This is the only safe state that this
1366 * option could be changed. Some segments
1367 * could already have been sent in other
1368 * states.
1369 */
1370 if (optval > 0)
1371 tp->t_flags |= TF_SIGNATURE;
1372 else
1373 tp->t_flags &= ~TF_SIGNATURE;
1374 } else {
1375 error = EOPNOTSUPP;
1376 }
b1992928
MD
1377 break;
1378#endif /* TCP_SIGNATURE */
984263bc
MD
1379 case TCP_NODELAY:
1380 case TCP_NOOPT:
984263bc
MD
1381 switch (sopt->sopt_name) {
1382 case TCP_NODELAY:
1383 opt = TF_NODELAY;
1384 break;
1385 case TCP_NOOPT:
1386 opt = TF_NOOPT;
1387 break;
1388 default:
1389 opt = 0; /* dead code to fool gcc */
1390 break;
1391 }
1392
1393 if (optval)
1394 tp->t_flags |= opt;
1395 else
1396 tp->t_flags &= ~opt;
1397 break;
1398
1399 case TCP_NOPUSH:
3533a183
SZ
1400 if (tcp_disable_nopush)
1401 break;
984263bc
MD
1402 if (optval)
1403 tp->t_flags |= TF_NOPUSH;
1404 else {
1405 tp->t_flags &= ~TF_NOPUSH;
1406 error = tcp_output(tp);
1407 }
1408 break;
1409
1410 case TCP_MAXSEG:
153d34ac
MD
1411 /*
1412 * Must be between 0 and maxseg. If the requested
1413 * maxseg is too small to satisfy the desired minmss,
1414 * pump it up (silently so sysctl modifications of
1415 * minmss do not create unexpected program failures).
1416 * Handle degenerate cases.
1417 */
1418 if (optval > 0 && optval <= tp->t_maxseg) {
1419 if (optval + 40 < tcp_minmss) {
1420 optval = tcp_minmss - 40;
1421 if (optval < 0)
1422 optval = 1;
1423 }
984263bc 1424 tp->t_maxseg = optval;
153d34ac 1425 } else {
984263bc 1426 error = EINVAL;
153d34ac 1427 }
984263bc
MD
1428 break;
1429
2ce132be
SZ
1430 case TCP_KEEPINIT:
1431 opthz = ((int64_t)optval * hz) / 1000;
1432 if (opthz >= 1)
1433 tp->t_keepinit = opthz;
1434 else
1435 error = EINVAL;
1436 break;
1437
7ea3a353
SZ
1438 case TCP_KEEPIDLE:
1439 opthz = ((int64_t)optval * hz) / 1000;
0a2b0c05 1440 if (opthz >= 1) {
7ea3a353 1441 tp->t_keepidle = opthz;
0a2b0c05
SZ
1442 tcp_timer_keep_activity(tp, 0);
1443 } else {
7ea3a353 1444 error = EINVAL;
0a2b0c05 1445 }
7ea3a353
SZ
1446 break;
1447
5d61ded3
SZ
1448 case TCP_KEEPINTVL:
1449 opthz = ((int64_t)optval * hz) / 1000;
1450 if (opthz >= 1) {
1451 tp->t_keepintvl = opthz;
1452 tp->t_maxidle = tp->t_keepintvl * tp->t_keepcnt;
1453 } else {
1454 error = EINVAL;
1455 }
1456 break;
1457
1458 case TCP_KEEPCNT:
1459 if (optval > 0) {
1460 tp->t_keepcnt = optval;
1461 tp->t_maxidle = tp->t_keepintvl * tp->t_keepcnt;
1462 } else {
1463 error = EINVAL;
1464 }
1465 break;
1466
984263bc
MD
1467 default:
1468 error = ENOPROTOOPT;
1469 break;
1470 }
1471 break;
1472
1473 case SOPT_GET:
1474 switch (sopt->sopt_name) {
b1992928
MD
1475#ifdef TCP_SIGNATURE
1476 case TCP_SIGNATURE_ENABLE:
1477 optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0;
1478 break;
1479#endif /* TCP_SIGNATURE */
984263bc
MD
1480 case TCP_NODELAY:
1481 optval = tp->t_flags & TF_NODELAY;
1482 break;
1483 case TCP_MAXSEG:
1484 optval = tp->t_maxseg;
1485 break;
1486 case TCP_NOOPT:
1487 optval = tp->t_flags & TF_NOOPT;
1488 break;
1489 case TCP_NOPUSH:
1490 optval = tp->t_flags & TF_NOPUSH;
1491 break;
2ce132be
SZ
1492 case TCP_KEEPINIT:
1493 optval = ((int64_t)tp->t_keepinit * 1000) / hz;
1494 break;
7ea3a353
SZ
1495 case TCP_KEEPIDLE:
1496 optval = ((int64_t)tp->t_keepidle * 1000) / hz;
1497 break;
5d61ded3
SZ
1498 case TCP_KEEPINTVL:
1499 optval = ((int64_t)tp->t_keepintvl * 1000) / hz;
1500 break;
1501 case TCP_KEEPCNT:
1502 optval = tp->t_keepcnt;
1503 break;
984263bc
MD
1504 default:
1505 error = ENOPROTOOPT;
1506 break;
1507 }
1508 if (error == 0)
e71a125f 1509 soopt_from_kbuf(sopt, &optval, sizeof optval);
984263bc
MD
1510 break;
1511 }
002c1265
MD
1512done:
1513 lwkt_replymsg(&msg->lmsg, error);
984263bc
MD
1514}
1515
1516/*
1517 * tcp_sendspace and tcp_recvspace are the default send and receive window
1518 * sizes, respectively. These are obsolescent (this information should
1519 * be set by the route).
0560a274
MD
1520 *
1521 * Use a default that does not require tcp window scaling to be turned
1522 * on. Individual programs or the administrator can increase the default.
984263bc 1523 */
0560a274 1524u_long tcp_sendspace = 57344; /* largest multiple of PAGE_SIZE < 64k */
f23061d4 1525SYSCTL_INT(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW,
984263bc
MD
1526 &tcp_sendspace , 0, "Maximum outgoing TCP datagram size");
1527u_long tcp_recvspace = 57344; /* largest multiple of PAGE_SIZE < 64k */
f23061d4 1528SYSCTL_INT(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
984263bc
MD
1529 &tcp_recvspace , 0, "Maximum incoming TCP datagram size");
1530
1531/*
0ce0603e
MD
1532 * Attach TCP protocol to socket, allocating internet protocol control
1533 * block, tcp control block, bufer space, and entering LISTEN state
1534 * if to accept connections.
984263bc
MD
1535 */
1536static int
e4700d00 1537tcp_attach(struct socket *so, struct pru_attach_info *ai)
984263bc 1538{
2256ba69 1539 struct tcpcb *tp;
984263bc
MD
1540 struct inpcb *inp;
1541 int error;
6ca1a1cd 1542 int cpu;
984263bc 1543#ifdef INET6
3641b7ca 1544 int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6) != 0;
984263bc
MD
1545#endif
1546
6d49aa6f 1547 if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) {
6cef7136 1548 lwkt_gettoken(&so->so_rcv.ssb_token);
e4700d00
JH
1549 error = soreserve(so, tcp_sendspace, tcp_recvspace,
1550 ai->sb_rlimit);
6cef7136 1551 lwkt_reltoken(&so->so_rcv.ssb_token);
984263bc
MD
1552 if (error)
1553 return (error);
1554 }
14343ad3
MD
1555 atomic_set_int(&so->so_rcv.ssb_flags, SSB_AUTOSIZE);
1556 atomic_set_int(&so->so_snd.ssb_flags, SSB_AUTOSIZE);
6ca1a1cd 1557 cpu = mycpu->gd_cpuid;
0ce0603e
MD
1558
1559 /*
1560 * Set the default port for protocol processing. This will likely
1561 * change when we connect.
1562 */
6ca1a1cd 1563 error = in_pcballoc(so, &tcbinfo[cpu]);
984263bc
MD
1564 if (error)
1565 return (error);
ed894f8c 1566 inp = so->so_pcb;
984263bc
MD
1567#ifdef INET6
1568 if (isipv6) {
1569 inp->inp_vflag |= INP_IPV6;
1570 inp->in6p_hops = -1; /* use kernel default */
1571 }
1572 else
1573#endif
1574 inp->inp_vflag |= INP_IPV4;
1575 tp = tcp_newtcpcb(inp);
6cef7136
MD
1576 if (tp == NULL) {
1577 /*
1578 * Make sure the socket is destroyed by the pcbdetach.
1579 */
1580 soreference(so);
984263bc
MD
1581#ifdef INET6
1582 if (isipv6)
1583 in6_pcbdetach(inp);
1584 else
1585#endif
1586 in_pcbdetach(inp);
6cef7136 1587 sofree(so); /* from ref above */
984263bc
MD
1588 return (ENOBUFS);
1589 }
1590 tp->t_state = TCPS_CLOSED;
1591 return (0);
1592}
1593
1594/*
1595 * Initiate (or continue) disconnect.
1596 * If embryonic state, just send reset (once).
1597 * If in ``let data drain'' option and linger null, just drop.
1598 * Otherwise (hard), mark socket disconnecting and drop
1599 * current input data; switch states based on user close, and
1600 * send segment to peer (with FIN).
1601 */
1602static struct tcpcb *
f3f70f0d 1603tcp_disconnect(struct tcpcb *tp)
984263bc
MD
1604{
1605 struct socket *so = tp->t_inpcb->inp_socket;
1606
6cef7136 1607 if (tp->t_state < TCPS_ESTABLISHED) {
984263bc 1608 tp = tcp_close(tp);
6cef7136 1609 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
984263bc 1610 tp = tcp_drop(tp, 0);
6cef7136
MD
1611 } else {
1612 lwkt_gettoken(&so->so_rcv.ssb_token);
984263bc 1613 soisdisconnecting(so);
6d49aa6f 1614 sbflush(&so->so_rcv.sb);
984263bc
MD
1615 tp = tcp_usrclosed(tp);
1616 if (tp)
f23061d4 1617 tcp_output(tp);
6cef7136 1618 lwkt_reltoken(&so->so_rcv.ssb_token);
984263bc
MD
1619 }
1620 return (tp);
1621}
1622
1623/*
1624 * User issued close, and wish to trail through shutdown states:
1625 * if never received SYN, just forget it. If got a SYN from peer,
1626 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
1627 * If already got a FIN from peer, then almost done; go to LAST_ACK
1628 * state. In all other cases, have already sent FIN to peer (e.g.
1629 * after PRU_SHUTDOWN), and just have to play tedious game waiting
1630 * for peer to send FIN or not respond to keep-alives, etc.
1631 * We can let the user exit from the close as soon as the FIN is acked.
1632 */
1633static struct tcpcb *
f3f70f0d 1634tcp_usrclosed(struct tcpcb *tp)
984263bc
MD
1635{
1636
1637 switch (tp->t_state) {
1638
1639 case TCPS_CLOSED:
1640 case TCPS_LISTEN:
1641 tp->t_state = TCPS_CLOSED;
1642 tp = tcp_close(tp);
1643 break;
1644
1645 case TCPS_SYN_SENT:
1646 case TCPS_SYN_RECEIVED:
1647 tp->t_flags |= TF_NEEDFIN;
1648 break;
1649
1650 case TCPS_ESTABLISHED:
1651 tp->t_state = TCPS_FIN_WAIT_1;
1652 break;
1653
1654 case TCPS_CLOSE_WAIT:
1655 tp->t_state = TCPS_LAST_ACK;
1656 break;
1657 }
1658 if (tp && tp->t_state >= TCPS_FIN_WAIT_2) {
1659 soisdisconnected(tp->t_inpcb->inp_socket);
1660 /* To prevent the connection hanging in FIN_WAIT_2 forever. */
a48c5dd5 1661 if (tp->t_state == TCPS_FIN_WAIT_2) {
5d61ded3 1662 tcp_callout_reset(tp, tp->tt_2msl, tp->t_maxidle,
a48c5dd5
SZ
1663 tcp_timer_2msl);
1664 }
984263bc
MD
1665 }
1666 return (tp);
1667}