1 /*
2 * Copyright (c) 2003, 2004 Jeffrey M. Hsu. All rights reserved.
3 * Copyright (c) 2003, 2004 The DragonFly Project. All rights reserved.
4 *
5 * This code is derived from software contributed to The DragonFly Project
6 * by Jeffrey M. Hsu.
7 *
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.
19 *
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 /*
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. Neither the name of the University nor the names of its contributors
47 * may be used to endorse or promote products derived from this software
48 * without specific prior written permission.
49 *
50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60 * SUCH DAMAGE.
61 *
62 * From: @(#)tcp_usrreq.c 8.2 (Berkeley) 1/3/94
63 * $FreeBSD: src/sys/netinet/tcp_usrreq.c,v 1.51.2.17 2002/10/11 11:46:44 ume Exp $
64 */
65
66 #include "opt_inet.h"
67 #include "opt_inet6.h"
68 #include "opt_tcpdebug.h"
69
70 #include <sys/param.h>
71 #include <sys/systm.h>
72 #include <sys/kernel.h>
73 #include <sys/malloc.h>
74 #include <sys/sysctl.h>
75 #include <sys/globaldata.h>
76 #include <sys/thread.h>
77
78 #include <sys/mbuf.h>
79 #ifdef INET6
80 #include <sys/domain.h>
81 #endif /* INET6 */
82 #include <sys/socket.h>
83 #include <sys/socketvar.h>
84 #include <sys/socketops.h>
85 #include <sys/protosw.h>
86 #include <sys/jail.h>
87
88 #include <sys/msgport2.h>
89 #include <sys/socketvar2.h>
90
91 #include <net/if.h>
92 #include <net/netisr.h>
93 #include <net/route.h>
94
95 #include <net/netmsg2.h>
96 #include <net/netisr2.h>
97
98 #include <netinet/in.h>
99 #include <netinet/in_systm.h>
100 #ifdef INET6
101 #include <netinet/ip6.h>
102 #endif
103 #include <netinet/in_pcb.h>
104 #ifdef INET6
105 #include <netinet6/in6_pcb.h>
106 #endif
107 #include <netinet/in_var.h>
108 #include <netinet/ip_var.h>
109 #ifdef INET6
110 #include <netinet6/ip6_var.h>
111 #include <netinet6/tcp6_var.h>
112 #endif
113 #include <netinet/tcp.h>
114 #include <netinet/tcp_fsm.h>
115 #include <netinet/tcp_seq.h>
116 #include <netinet/tcp_timer.h>
117 #include <netinet/tcp_timer2.h>
118 #include <netinet/tcp_var.h>
119 #include <netinet/tcpip.h>
120 #ifdef TCPDEBUG
121 #include <netinet/tcp_debug.h>
122 #endif
123 #include <machine/limits.h>
124
125 /*
126 * Limits for TCP_KEEP* options (we will adopt the same limits that linux
127 * uses).
128 */
129 #define MAXKEEPALIVE 32767
130 #define MAXKEEPCNT 127
131
132 /*
133 * TCP protocol interface to socket abstraction.
134 */
135 extern char *tcpstates[]; /* XXX ??? */
136
137 static int tcp_attach (struct socket *, struct pru_attach_info *);
138 static void tcp_connect (netmsg_t msg);
139 #ifdef INET6
140 static void tcp6_connect (netmsg_t msg);
141 static int tcp6_connect_oncpu(struct tcpcb *tp, int flags,
142 struct mbuf **mp,
143 struct sockaddr_in6 *sin6,
144 struct in6_addr *addr6);
145 #endif /* INET6 */
146 static struct tcpcb *
147 tcp_disconnect (struct tcpcb *);
148 static struct tcpcb *
149 tcp_usrclosed (struct tcpcb *);
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
162 /*
163 * For some ill optimized programs, which try to use TCP_NOPUSH
164 * to improve performance, will have small amount of data sits
165 * in the sending buffer. These small amount of data will _not_
166 * be pushed into the network until more data are written into
167 * the socket or the socket write side is shutdown.
168 */
169 static int tcp_disable_nopush = 1;
170 SYSCTL_INT(_net_inet_tcp, OID_AUTO, disable_nopush, CTLFLAG_RW,
171 &tcp_disable_nopush, 0, "TCP_NOPUSH socket option will have no effect");
172
173 /*
174 * Allocate socket buffer space.
175 */
176 static int
tcp_usr_preattach(struct socket * so,int proto __unused,struct pru_attach_info * ai)177 tcp_usr_preattach(struct socket *so, int proto __unused,
178 struct pru_attach_info *ai)
179 {
180 int error;
181
182 if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) {
183 error = soreserve(so, tcp_sendspace, tcp_recvspace,
184 ai->sb_rlimit);
185 if (error)
186 return (error);
187 }
188 atomic_set_int(&so->so_rcv.ssb_flags, SSB_AUTOSIZE);
189 atomic_set_int(&so->so_snd.ssb_flags, SSB_AUTOSIZE | SSB_PREALLOC);
190
191 return 0;
192 }
193
194 /*
195 * TCP attaches to socket via pru_attach(), reserving space,
196 * and an internet control block. This socket may move to
197 * other CPU later when we bind/connect.
198 */
199 static void
tcp_usr_attach(netmsg_t msg)200 tcp_usr_attach(netmsg_t msg)
201 {
202 struct socket *so = msg->base.nm_so;
203 struct pru_attach_info *ai = msg->attach.nm_ai;
204 int error;
205 struct inpcb *inp;
206 struct tcpcb *tp = NULL;
207 TCPDEBUG0;
208
209 inp = so->so_pcb;
210 KASSERT(inp == NULL, ("tcp socket attached"));
211 TCPDEBUG1();
212
213 error = tcp_attach(so, ai);
214 if (error)
215 goto out;
216
217 if ((so->so_options & SO_LINGER) && so->so_linger == 0)
218 so->so_linger = TCP_LINGERTIME;
219 tp = sototcpcb(so);
220 out:
221 TCPDEBUG2(PRU_ATTACH);
222 lwkt_replymsg(&msg->lmsg, error);
223 }
224
225 /*
226 * pru_detach() detaches the TCP protocol from the socket.
227 * If the protocol state is non-embryonic, then can't
228 * do this directly: have to initiate a pru_disconnect(),
229 * which may finish later; embryonic TCB's can just
230 * be discarded here.
231 */
232 static void
tcp_usr_detach(netmsg_t msg)233 tcp_usr_detach(netmsg_t msg)
234 {
235 struct socket *so = msg->base.nm_so;
236 int error = 0;
237 struct inpcb *inp;
238 struct tcpcb *tp;
239 TCPDEBUG0;
240
241 inp = so->so_pcb;
242
243 /*
244 * If the inp is already detached or never attached, it may have
245 * been due to an async close or async attach failure. Just return
246 * as if no error occured.
247 */
248 if (inp) {
249 tp = intotcpcb(inp);
250 KASSERT(tp != NULL, ("tcp_usr_detach: tp is NULL"));
251 TCPDEBUG1();
252 tp = tcp_disconnect(tp);
253 TCPDEBUG2(PRU_DETACH);
254 }
255 lwkt_replymsg(&msg->lmsg, error);
256 }
257
258 /*
259 * NOTE: ignore_error is non-zero for certain disconnection races
260 * which we want to silently allow, otherwise close() may return
261 * an unexpected error.
262 *
263 * NOTE: The variables (msg) and (tp) are assumed.
264 */
265 #define COMMON_START(so, inp, ignore_error) \
266 TCPDEBUG0; \
267 \
268 inp = so->so_pcb; \
269 do { \
270 if (inp == NULL) { \
271 error = ignore_error ? 0 : EINVAL; \
272 tp = NULL; \
273 goto out; \
274 } \
275 tp = intotcpcb(inp); \
276 TCPDEBUG1(); \
277 } while(0)
278
279 #define COMMON_END1(req, noreply) \
280 out: do { \
281 TCPDEBUG2(req); \
282 if (!(noreply)) \
283 lwkt_replymsg(&msg->lmsg, error); \
284 return; \
285 } while(0)
286
287 #define COMMON_END(req) COMMON_END1((req), 0)
288
289 static void
tcp_sosetport(struct lwkt_msg * msg,lwkt_port_t port)290 tcp_sosetport(struct lwkt_msg *msg, lwkt_port_t port)
291 {
292 sosetport(((struct netmsg_base *)msg)->nm_so, port);
293 }
294
295 /*
296 * Give the socket an address.
297 */
298 static void
tcp_usr_bind(netmsg_t msg)299 tcp_usr_bind(netmsg_t msg)
300 {
301 struct socket *so = msg->bind.base.nm_so;
302 struct sockaddr *nam = msg->bind.nm_nam;
303 struct thread *td = msg->bind.nm_td;
304 int error = 0;
305 struct inpcb *inp;
306 struct tcpcb *tp;
307 struct sockaddr_in *sinp;
308 lwkt_port_t port0 = netisr_cpuport(0);
309
310 COMMON_START(so, inp, 0);
311
312 /*
313 * Must check for multicast addresses and disallow binding
314 * to them.
315 */
316 sinp = (struct sockaddr_in *)nam;
317 if (sinp->sin_family == AF_INET &&
318 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
319 error = EAFNOSUPPORT;
320 goto out;
321 }
322
323 /*
324 * Check "already bound" here (in_pcbbind() does the same check
325 * though), so we don't forward a connected socket to netisr0,
326 * which would panic in the following in_pcbunlink().
327 */
328 if (inp->inp_lport != 0 || inp->inp_laddr.s_addr != INADDR_ANY) {
329 error = EINVAL; /* already bound */
330 goto out;
331 }
332
333 /*
334 * Use netisr0 to serialize in_pcbbind(), so that pru_detach and
335 * pru_bind for different sockets on the same local port could be
336 * properly ordered. The original race is illustrated here for
337 * reference.
338 *
339 * s1 = socket();
340 * bind(s1, *.PORT);
341 * close(s1); <----- asynchronous
342 * s2 = socket();
343 * bind(s2, *.PORT);
344 *
345 * All will expect bind(s2, *.PORT) to succeed. However, it will
346 * fail, if following sequence happens due to random socket initial
347 * msgport and asynchronous close(2):
348 *
349 * netisrN netisrM
350 * : :
351 * : pru_bind(s2) [*.PORT is used by s1]
352 * pru_detach(s1) :
353 */
354 if (&curthread->td_msgport != port0) {
355 lwkt_msg_t lmsg = &msg->bind.base.lmsg;
356
357 KASSERT((msg->bind.nm_flags & PRUB_RELINK) == 0,
358 ("already asked to relink"));
359
360 in_pcbunlink(so->so_pcb, &tcbinfo[mycpuid]);
361 msg->bind.nm_flags |= PRUB_RELINK;
362
363 TCP_STATE_MIGRATE_START(tp);
364
365 /* See the related comment in tcp_connect() */
366 lwkt_setmsg_receipt(lmsg, tcp_sosetport);
367 lwkt_forwardmsg(port0, lmsg);
368 /* msg invalid now */
369 return;
370 }
371 KASSERT(so->so_port == port0, ("so_port is not netisr0"));
372
373 if (msg->bind.nm_flags & PRUB_RELINK) {
374 msg->bind.nm_flags &= ~PRUB_RELINK;
375 TCP_STATE_MIGRATE_END(tp);
376 in_pcblink(so->so_pcb, &tcbinfo[mycpuid]);
377 }
378 KASSERT(inp->inp_pcbinfo == &tcbinfo[0], ("pcbinfo is not tcbinfo0"));
379
380 error = in_pcbbind(inp, nam, td);
381 if (error)
382 goto out;
383
384 COMMON_END(PRU_BIND);
385 }
386
387 #ifdef INET6
388
389 static void
tcp6_usr_bind(netmsg_t msg)390 tcp6_usr_bind(netmsg_t msg)
391 {
392 struct socket *so = msg->bind.base.nm_so;
393 struct sockaddr *nam = msg->bind.nm_nam;
394 struct thread *td = msg->bind.nm_td;
395 int error = 0;
396 struct inpcb *inp;
397 struct tcpcb *tp;
398 struct sockaddr_in6 *sin6p;
399
400 COMMON_START(so, inp, 0);
401
402 /*
403 * Must check for multicast addresses and disallow binding
404 * to them.
405 */
406 sin6p = (struct sockaddr_in6 *)nam;
407 if (sin6p->sin6_family == AF_INET6 &&
408 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
409 error = EAFNOSUPPORT;
410 goto out;
411 }
412 error = in6_pcbbind(inp, nam, td);
413 if (error)
414 goto out;
415 COMMON_END(PRU_BIND);
416 }
417 #endif /* INET6 */
418
419 struct netmsg_inswildcard {
420 struct netmsg_base base;
421 struct inpcb *nm_inp;
422 };
423
424 static void
in_pcbinswildcardhash_handler(netmsg_t msg)425 in_pcbinswildcardhash_handler(netmsg_t msg)
426 {
427 struct netmsg_inswildcard *nm = (struct netmsg_inswildcard *)msg;
428 int cpu = mycpuid, nextcpu;
429
430 in_pcbinswildcardhash_oncpu(nm->nm_inp, &tcbinfo[cpu]);
431
432 nextcpu = cpu + 1;
433 if (nextcpu < netisr_ncpus)
434 lwkt_forwardmsg(netisr_cpuport(nextcpu), &nm->base.lmsg);
435 else
436 lwkt_replymsg(&nm->base.lmsg, 0);
437 }
438
439 /*
440 * Prepare to accept connections.
441 */
442 static void
tcp_usr_listen(netmsg_t msg)443 tcp_usr_listen(netmsg_t msg)
444 {
445 struct socket *so = msg->listen.base.nm_so;
446 struct thread *td = msg->listen.nm_td;
447 int error = 0;
448 struct inpcb *inp;
449 struct tcpcb *tp;
450 struct netmsg_inswildcard nm;
451 lwkt_port_t port0 = netisr_cpuport(0);
452
453 COMMON_START(so, inp, 0);
454
455 if (&curthread->td_msgport != port0) {
456 lwkt_msg_t lmsg = &msg->listen.base.lmsg;
457
458 KASSERT((msg->listen.nm_flags & PRUL_RELINK) == 0,
459 ("already asked to relink"));
460
461 in_pcbunlink(so->so_pcb, &tcbinfo[mycpuid]);
462 msg->listen.nm_flags |= PRUL_RELINK;
463
464 TCP_STATE_MIGRATE_START(tp);
465
466 /* See the related comment in tcp_connect() */
467 lwkt_setmsg_receipt(lmsg, tcp_sosetport);
468 lwkt_forwardmsg(port0, lmsg);
469 /* msg invalid now */
470 return;
471 }
472 KASSERT(so->so_port == port0, ("so_port is not netisr0"));
473
474 if (msg->listen.nm_flags & PRUL_RELINK) {
475 msg->listen.nm_flags &= ~PRUL_RELINK;
476 TCP_STATE_MIGRATE_END(tp);
477 in_pcblink(so->so_pcb, &tcbinfo[mycpuid]);
478 }
479 KASSERT(inp->inp_pcbinfo == &tcbinfo[0], ("pcbinfo is not tcbinfo0"));
480
481 if (tp->t_flags & TF_LISTEN)
482 goto out;
483
484 if (inp->inp_lport == 0) {
485 error = in_pcbbind(inp, NULL, td);
486 if (error)
487 goto out;
488 }
489
490 TCP_STATE_CHANGE(tp, TCPS_LISTEN);
491 tp->t_flags |= TF_LISTEN;
492 tp->tt_msg = NULL; /* Catch any invalid timer usage */
493
494 /*
495 * Create tcpcb per-cpu port cache
496 *
497 * NOTE:
498 * This _must_ be done before installing this inpcb into
499 * wildcard hash.
500 */
501 tcp_pcbport_create(tp);
502
503 if (netisr_ncpus > 1) {
504 /*
505 * Put this inpcb into wildcard hash on other cpus.
506 */
507 ASSERT_INP_NOTINHASH(inp);
508 netmsg_init(&nm.base, NULL, &curthread->td_msgport,
509 MSGF_PRIORITY, in_pcbinswildcardhash_handler);
510 nm.nm_inp = inp;
511 lwkt_domsg(netisr_cpuport(1), &nm.base.lmsg, 0);
512 }
513 in_pcbinswildcardhash(inp);
514 COMMON_END(PRU_LISTEN);
515 }
516
517 #ifdef INET6
518
519 static void
tcp6_usr_listen(netmsg_t msg)520 tcp6_usr_listen(netmsg_t msg)
521 {
522 struct socket *so = msg->listen.base.nm_so;
523 struct thread *td = msg->listen.nm_td;
524 int error = 0;
525 struct inpcb *inp;
526 struct tcpcb *tp;
527 struct netmsg_inswildcard nm;
528
529 COMMON_START(so, inp, 0);
530
531 if (tp->t_flags & TF_LISTEN)
532 goto out;
533
534 if (inp->inp_lport == 0) {
535 error = in6_pcbbind(inp, NULL, td);
536 if (error)
537 goto out;
538 }
539
540 TCP_STATE_CHANGE(tp, TCPS_LISTEN);
541 tp->t_flags |= TF_LISTEN;
542 tp->tt_msg = NULL; /* Catch any invalid timer usage */
543
544 /*
545 * Create tcpcb per-cpu port cache
546 *
547 * NOTE:
548 * This _must_ be done before installing this inpcb into
549 * wildcard hash.
550 */
551 tcp_pcbport_create(tp);
552
553 if (netisr_ncpus > 1) {
554 /*
555 * Put this inpcb into wildcard hash on other cpus.
556 */
557 KKASSERT(so->so_port == netisr_cpuport(0));
558 ASSERT_NETISR0;
559 KKASSERT(inp->inp_pcbinfo == &tcbinfo[0]);
560 ASSERT_INP_NOTINHASH(inp);
561
562 netmsg_init(&nm.base, NULL, &curthread->td_msgport,
563 MSGF_PRIORITY, in_pcbinswildcardhash_handler);
564 nm.nm_inp = inp;
565 lwkt_domsg(netisr_cpuport(1), &nm.base.lmsg, 0);
566 }
567 in_pcbinswildcardhash(inp);
568 COMMON_END(PRU_LISTEN);
569 }
570 #endif /* INET6 */
571
572 /*
573 * Initiate connection to peer.
574 * Create a template for use in transmissions on this connection.
575 * Enter SYN_SENT state, and mark socket as connecting.
576 * Start keep-alive timer, and seed output sequence space.
577 * Send initial segment on connection.
578 */
579 static void
tcp_usr_connect(netmsg_t msg)580 tcp_usr_connect(netmsg_t msg)
581 {
582 struct socket *so = msg->connect.base.nm_so;
583 struct sockaddr *nam = msg->connect.nm_nam;
584 struct thread *td = msg->connect.nm_td;
585 int error = 0;
586 struct inpcb *inp;
587 struct tcpcb *tp;
588 struct sockaddr_in *sinp;
589
590 ASSERT_NETISR_NCPUS(mycpuid);
591
592 COMMON_START(so, inp, 0);
593
594 /*
595 * Must disallow TCP ``connections'' to multicast addresses.
596 */
597 sinp = (struct sockaddr_in *)nam;
598 if (sinp->sin_family == AF_INET
599 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
600 error = EAFNOSUPPORT;
601 goto out;
602 }
603 tcp_connect(msg);
604 /* msg is invalid now */
605 return;
606 out:
607 if (msg->connect.nm_m) {
608 m_freem(msg->connect.nm_m);
609 msg->connect.nm_m = NULL;
610 }
611 if (msg->connect.nm_flags & PRUC_HELDTD)
612 lwkt_rele(td);
613 if (error && (msg->connect.nm_flags & PRUC_ASYNC)) {
614 so->so_error = error;
615 soisdisconnected(so);
616 }
617 lwkt_replymsg(&msg->lmsg, error);
618 }
619
620 #ifdef INET6
621
622 static void
tcp6_usr_connect(netmsg_t msg)623 tcp6_usr_connect(netmsg_t msg)
624 {
625 struct socket *so = msg->connect.base.nm_so;
626 struct sockaddr *nam = msg->connect.nm_nam;
627 struct thread *td = msg->connect.nm_td;
628 int error = 0;
629 struct inpcb *inp;
630 struct tcpcb *tp;
631 struct sockaddr_in6 *sin6p;
632
633 ASSERT_NETISR_NCPUS(mycpuid);
634
635 COMMON_START(so, inp, 0);
636
637 /*
638 * Must disallow TCP ``connections'' to multicast addresses.
639 */
640 sin6p = (struct sockaddr_in6 *)nam;
641 if (sin6p->sin6_family == AF_INET6
642 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
643 error = EAFNOSUPPORT;
644 goto out;
645 }
646
647 if (!prison_remote_ip(td, nam)) {
648 error = EAFNOSUPPORT; /* Illegal jail IP */
649 goto out;
650 }
651
652 /* Reject v4-mapped address */
653 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
654 error = EADDRNOTAVAIL;
655 goto out;
656 }
657
658 inp->inp_inc.inc_isipv6 = 1;
659 tcp6_connect(msg);
660 /* msg is invalid now */
661 return;
662 out:
663 if (msg->connect.nm_m) {
664 m_freem(msg->connect.nm_m);
665 msg->connect.nm_m = NULL;
666 }
667 lwkt_replymsg(&msg->lmsg, error);
668 }
669
670 #endif /* INET6 */
671
672 /*
673 * Initiate disconnect from peer.
674 * If connection never passed embryonic stage, just drop;
675 * else if don't need to let data drain, then can just drop anyways,
676 * else have to begin TCP shutdown process: mark socket disconnecting,
677 * drain unread data, state switch to reflect user close, and
678 * send segment (e.g. FIN) to peer. Socket will be really disconnected
679 * when peer sends FIN and acks ours.
680 *
681 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
682 */
683 static void
tcp_usr_disconnect(netmsg_t msg)684 tcp_usr_disconnect(netmsg_t msg)
685 {
686 struct socket *so = msg->disconnect.base.nm_so;
687 int error = 0;
688 struct inpcb *inp;
689 struct tcpcb *tp;
690
691 COMMON_START(so, inp, 1);
692 tp = tcp_disconnect(tp);
693 COMMON_END(PRU_DISCONNECT);
694 }
695
696 /*
697 * Accept a connection. Essentially all the work is
698 * done at higher levels; just return the address
699 * of the peer, storing through addr.
700 */
701 static void
tcp_usr_accept(netmsg_t msg)702 tcp_usr_accept(netmsg_t msg)
703 {
704 struct socket *so = msg->accept.base.nm_so;
705 struct sockaddr **nam = msg->accept.nm_nam;
706 int error = 0;
707 struct inpcb *inp;
708 struct tcpcb *tp = NULL;
709 TCPDEBUG0;
710
711 inp = so->so_pcb;
712 if (so->so_state & SS_ISDISCONNECTED) {
713 error = ECONNABORTED;
714 goto out;
715 }
716 if (inp == NULL) {
717 error = EINVAL;
718 goto out;
719 }
720
721 tp = intotcpcb(inp);
722 TCPDEBUG1();
723 in_setpeeraddr(so, nam);
724 COMMON_END(PRU_ACCEPT);
725 }
726
727 #ifdef INET6
728 static void
tcp6_usr_accept(netmsg_t msg)729 tcp6_usr_accept(netmsg_t msg)
730 {
731 struct socket *so = msg->accept.base.nm_so;
732 struct sockaddr **nam = msg->accept.nm_nam;
733 int error = 0;
734 struct inpcb *inp;
735 struct tcpcb *tp = NULL;
736 TCPDEBUG0;
737
738 inp = so->so_pcb;
739
740 if (so->so_state & SS_ISDISCONNECTED) {
741 error = ECONNABORTED;
742 goto out;
743 }
744 if (inp == NULL) {
745 error = EINVAL;
746 goto out;
747 }
748 tp = intotcpcb(inp);
749 TCPDEBUG1();
750 in6_setpeeraddr(so, nam);
751 COMMON_END(PRU_ACCEPT);
752 }
753 #endif /* INET6 */
754
755 /*
756 * Mark the connection as being incapable of further output.
757 */
758 static void
tcp_usr_shutdown(netmsg_t msg)759 tcp_usr_shutdown(netmsg_t msg)
760 {
761 struct socket *so = msg->shutdown.base.nm_so;
762 int error = 0;
763 struct inpcb *inp;
764 struct tcpcb *tp;
765
766 COMMON_START(so, inp, 0);
767 socantsendmore(so);
768 tp = tcp_usrclosed(tp);
769 if (tp)
770 error = tcp_output(tp);
771 COMMON_END(PRU_SHUTDOWN);
772 }
773
774 /*
775 * After a receive, possibly send window update to peer.
776 */
777 static void
tcp_usr_rcvd(netmsg_t msg)778 tcp_usr_rcvd(netmsg_t msg)
779 {
780 struct socket *so = msg->rcvd.base.nm_so;
781 int error = 0, noreply = 0;
782 struct inpcb *inp;
783 struct tcpcb *tp;
784
785 COMMON_START(so, inp, 0);
786
787 if (msg->rcvd.nm_pru_flags & PRUR_ASYNC) {
788 noreply = 1;
789 so_async_rcvd_reply(so);
790 }
791 tcp_output(tp);
792
793 COMMON_END1(PRU_RCVD, noreply);
794 }
795
796 /*
797 * Do a send by putting data in output queue and updating urgent
798 * marker if URG set. Possibly send more data. Unlike the other
799 * pru_*() routines, the mbuf chains are our responsibility. We
800 * must either enqueue them or free them. The other pru_* routines
801 * generally are caller-frees.
802 */
803 static void
tcp_usr_send(netmsg_t msg)804 tcp_usr_send(netmsg_t msg)
805 {
806 struct socket *so = msg->send.base.nm_so;
807 int flags = msg->send.nm_flags;
808 struct mbuf *m = msg->send.nm_m;
809 int error = 0;
810 struct inpcb *inp;
811 struct tcpcb *tp;
812 TCPDEBUG0;
813
814 KKASSERT(msg->send.nm_control == NULL);
815 KKASSERT(msg->send.nm_addr == NULL);
816 KKASSERT((flags & PRUS_FREEADDR) == 0);
817
818 inp = so->so_pcb;
819
820 if (inp == NULL) {
821 /*
822 * OOPS! we lost a race, the TCP session got reset after
823 * we checked SS_CANTSENDMORE, eg: while doing uiomove or a
824 * network interrupt in the non-critical section of sosend().
825 */
826 m_freem(m);
827 error = ECONNRESET; /* XXX EPIPE? */
828 tp = NULL;
829 TCPDEBUG1();
830 goto out;
831 }
832 tp = intotcpcb(inp);
833 TCPDEBUG1();
834
835 #ifdef foo
836 /*
837 * This is no longer necessary, since:
838 * - sosendtcp() has already checked it for us
839 * - It does not work with asynchronized send
840 */
841
842 /*
843 * Don't let too much OOB data build up
844 */
845 if (flags & PRUS_OOB) {
846 if (ssb_space(&so->so_snd) < -512) {
847 m_freem(m);
848 error = ENOBUFS;
849 goto out;
850 }
851 }
852 #endif
853
854 /*
855 * Pump the data into the socket.
856 */
857 if (m) {
858 ssb_appendstream(&so->so_snd, m);
859 sowwakeup(so);
860 }
861 if (flags & PRUS_OOB) {
862 /*
863 * According to RFC961 (Assigned Protocols),
864 * the urgent pointer points to the last octet
865 * of urgent data. We continue, however,
866 * to consider it to indicate the first octet
867 * of data past the urgent section.
868 * Otherwise, snd_up should be one lower.
869 */
870 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc;
871 tp->t_flags |= TF_FORCE;
872 error = tcp_output(tp);
873 tp->t_flags &= ~TF_FORCE;
874 } else {
875 if (flags & PRUS_EOF) {
876 /*
877 * Close the send side of the connection after
878 * the data is sent.
879 */
880 socantsendmore(so);
881 tp = tcp_usrclosed(tp);
882 }
883 if (tp != NULL && !tcp_output_pending(tp)) {
884 if (flags & PRUS_MORETOCOME)
885 tp->t_flags |= TF_MORETOCOME;
886 error = tcp_output_fair(tp);
887 if (flags & PRUS_MORETOCOME)
888 tp->t_flags &= ~TF_MORETOCOME;
889 }
890 }
891 COMMON_END1((flags & PRUS_OOB) ? PRU_SENDOOB :
892 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND),
893 (flags & PRUS_NOREPLY));
894 }
895
896 /*
897 * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort()
898 * will sofree() it when we return.
899 */
900 static void
tcp_usr_abort(netmsg_t msg)901 tcp_usr_abort(netmsg_t msg)
902 {
903 struct socket *so = msg->abort.base.nm_so;
904 int error = 0;
905 struct inpcb *inp;
906 struct tcpcb *tp;
907
908 COMMON_START(so, inp, 1);
909 tp = tcp_drop(tp, ECONNABORTED);
910 COMMON_END(PRU_ABORT);
911 }
912
913 /*
914 * Receive out-of-band data.
915 */
916 static void
tcp_usr_rcvoob(netmsg_t msg)917 tcp_usr_rcvoob(netmsg_t msg)
918 {
919 struct socket *so = msg->rcvoob.base.nm_so;
920 struct mbuf *m = msg->rcvoob.nm_m;
921 int flags = msg->rcvoob.nm_flags;
922 int error = 0;
923 struct inpcb *inp;
924 struct tcpcb *tp;
925
926 COMMON_START(so, inp, 0);
927 if ((so->so_oobmark == 0 &&
928 (so->so_state & SS_RCVATMARK) == 0) ||
929 so->so_options & SO_OOBINLINE ||
930 tp->t_oobflags & TCPOOB_HADDATA) {
931 error = EINVAL;
932 goto out;
933 }
934 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
935 error = EWOULDBLOCK;
936 goto out;
937 }
938 m->m_len = 1;
939 *mtod(m, caddr_t) = tp->t_iobc;
940 if ((flags & MSG_PEEK) == 0)
941 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
942 COMMON_END(PRU_RCVOOB);
943 }
944
945 static void
tcp_usr_savefaddr(struct socket * so,const struct sockaddr * faddr)946 tcp_usr_savefaddr(struct socket *so, const struct sockaddr *faddr)
947 {
948 in_savefaddr(so, faddr);
949 }
950
951 #ifdef INET6
952 static void
tcp6_usr_savefaddr(struct socket * so,const struct sockaddr * faddr)953 tcp6_usr_savefaddr(struct socket *so, const struct sockaddr *faddr)
954 {
955 in6_savefaddr(so, faddr);
956 }
957 #endif
958
959 static int
tcp_usr_preconnect(struct socket * so,const struct sockaddr * nam,struct thread * td __unused)960 tcp_usr_preconnect(struct socket *so, const struct sockaddr *nam,
961 struct thread *td __unused)
962 {
963 const struct sockaddr_in *sinp;
964
965 sinp = (const struct sockaddr_in *)nam;
966 if (sinp->sin_family == AF_INET &&
967 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
968 return EAFNOSUPPORT;
969
970 soisconnecting(so);
971 return 0;
972 }
973
974 /* xxx - should be const */
975 struct pr_usrreqs tcp_usrreqs = {
976 .pru_abort = tcp_usr_abort,
977 .pru_accept = tcp_usr_accept,
978 .pru_attach = tcp_usr_attach,
979 .pru_bind = tcp_usr_bind,
980 .pru_connect = tcp_usr_connect,
981 .pru_connect2 = pr_generic_notsupp,
982 .pru_control = in_control_dispatch,
983 .pru_detach = tcp_usr_detach,
984 .pru_disconnect = tcp_usr_disconnect,
985 .pru_listen = tcp_usr_listen,
986 .pru_peeraddr = in_setpeeraddr_dispatch,
987 .pru_rcvd = tcp_usr_rcvd,
988 .pru_rcvoob = tcp_usr_rcvoob,
989 .pru_send = tcp_usr_send,
990 .pru_sense = pru_sense_null,
991 .pru_shutdown = tcp_usr_shutdown,
992 .pru_sockaddr = in_setsockaddr_dispatch,
993 .pru_sosend = sosendtcp,
994 .pru_soreceive = sorecvtcp,
995 .pru_savefaddr = tcp_usr_savefaddr,
996 .pru_preconnect = tcp_usr_preconnect,
997 .pru_preattach = tcp_usr_preattach
998 };
999
1000 #ifdef INET6
1001 struct pr_usrreqs tcp6_usrreqs = {
1002 .pru_abort = tcp_usr_abort,
1003 .pru_accept = tcp6_usr_accept,
1004 .pru_attach = tcp_usr_attach,
1005 .pru_bind = tcp6_usr_bind,
1006 .pru_connect = tcp6_usr_connect,
1007 .pru_connect2 = pr_generic_notsupp,
1008 .pru_control = in6_control_dispatch,
1009 .pru_detach = tcp_usr_detach,
1010 .pru_disconnect = tcp_usr_disconnect,
1011 .pru_listen = tcp6_usr_listen,
1012 .pru_peeraddr = in6_setpeeraddr_dispatch,
1013 .pru_rcvd = tcp_usr_rcvd,
1014 .pru_rcvoob = tcp_usr_rcvoob,
1015 .pru_send = tcp_usr_send,
1016 .pru_sense = pru_sense_null,
1017 .pru_shutdown = tcp_usr_shutdown,
1018 .pru_sockaddr = in6_setsockaddr_dispatch,
1019 .pru_sosend = sosendtcp,
1020 .pru_soreceive = sorecvtcp,
1021 .pru_savefaddr = tcp6_usr_savefaddr
1022 };
1023 #endif /* INET6 */
1024
1025 static int
tcp_connect_oncpu(struct tcpcb * tp,int flags,struct mbuf * m,const struct sockaddr_in * sin,struct sockaddr_in * if_sin,uint16_t hash)1026 tcp_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf *m,
1027 const struct sockaddr_in *sin, struct sockaddr_in *if_sin,
1028 uint16_t hash)
1029 {
1030 struct inpcb *inp = tp->t_inpcb, *oinp;
1031 struct socket *so = inp->inp_socket;
1032 struct route *ro = &inp->inp_route;
1033
1034 KASSERT(inp->inp_pcbinfo == &tcbinfo[mycpu->gd_cpuid],
1035 ("pcbinfo mismatch"));
1036
1037 oinp = in_pcblookup_hash(inp->inp_pcbinfo,
1038 sin->sin_addr, sin->sin_port,
1039 (inp->inp_laddr.s_addr != INADDR_ANY ?
1040 inp->inp_laddr : if_sin->sin_addr),
1041 inp->inp_lport, 0, NULL);
1042 if (oinp != NULL) {
1043 m_freem(m);
1044 return (EADDRINUSE);
1045 }
1046 if (inp->inp_laddr.s_addr == INADDR_ANY)
1047 inp->inp_laddr = if_sin->sin_addr;
1048 KASSERT(inp->inp_faddr.s_addr == sin->sin_addr.s_addr,
1049 ("faddr mismatch for reconnect"));
1050 KASSERT(inp->inp_fport == sin->sin_port,
1051 ("fport mismatch for reconnect"));
1052 in_pcbinsconnhash(inp);
1053
1054 inp->inp_flags |= INP_HASH;
1055 inp->inp_hashval = hash;
1056
1057 /*
1058 * We are now on the inpcb's owner CPU, if the cached route was
1059 * freed because the rtentry's owner CPU is not the current CPU
1060 * (e.g. in tcp_connect()), then we try to reallocate it here with
1061 * the hope that a rtentry may be cloned from a RTF_PRCLONING
1062 * rtentry.
1063 */
1064 if (!(inp->inp_socket->so_options & SO_DONTROUTE) && /*XXX*/
1065 ro->ro_rt == NULL) {
1066 bzero(&ro->ro_dst, sizeof(struct sockaddr_in));
1067 ro->ro_dst.sa_family = AF_INET;
1068 ro->ro_dst.sa_len = sizeof(struct sockaddr_in);
1069 ((struct sockaddr_in *)&ro->ro_dst)->sin_addr =
1070 sin->sin_addr;
1071 rtalloc(ro);
1072 }
1073
1074 /*
1075 * Now that no more errors can occur, change the protocol processing
1076 * port to the current thread (which is the correct thread).
1077 *
1078 * Create TCP timer message now; we are on the tcpcb's owner
1079 * CPU/thread.
1080 */
1081 tcp_create_timermsg(tp, &curthread->td_msgport);
1082
1083 /*
1084 * Compute window scaling to request. Use a larger scaling then
1085 * needed for the initial receive buffer in case the receive buffer
1086 * gets expanded.
1087 */
1088 if (tp->request_r_scale < TCP_MIN_WINSHIFT)
1089 tp->request_r_scale = TCP_MIN_WINSHIFT;
1090 while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1091 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat
1092 ) {
1093 tp->request_r_scale++;
1094 }
1095
1096 soisconnecting(so);
1097 tcpstat.tcps_connattempt++;
1098 TCP_STATE_CHANGE(tp, TCPS_SYN_SENT);
1099 tcp_callout_reset(tp, tp->tt_keep, tp->t_keepinit, tcp_timer_keep);
1100 tp->iss = tcp_new_isn(tp);
1101 tcp_sendseqinit(tp);
1102 if (m) {
1103 ssb_appendstream(&so->so_snd, m);
1104 m = NULL;
1105 if (flags & PRUS_OOB)
1106 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc;
1107 }
1108
1109 /*
1110 * Close the send side of the connection after
1111 * the data is sent if flagged.
1112 */
1113 if ((flags & (PRUS_OOB|PRUS_EOF)) == PRUS_EOF) {
1114 socantsendmore(so);
1115 tp = tcp_usrclosed(tp);
1116 }
1117 return (tcp_output(tp));
1118 }
1119
1120 /*
1121 * Common subroutine to open a TCP connection to remote host specified
1122 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local
1123 * port number if needed. Call in_pcbladdr to do the routing and to choose
1124 * a local host address (interface).
1125 * Initialize connection parameters and enter SYN-SENT state.
1126 */
1127 static void
tcp_connect(netmsg_t msg)1128 tcp_connect(netmsg_t msg)
1129 {
1130 struct socket *so = msg->connect.base.nm_so;
1131 struct sockaddr *nam = msg->connect.nm_nam;
1132 struct thread *td = msg->connect.nm_td;
1133 struct sockaddr_in *sin = (struct sockaddr_in *)nam;
1134 struct sockaddr_in *if_sin = NULL;
1135 struct inpcb *inp;
1136 struct tcpcb *tp;
1137 int error;
1138 uint16_t hash;
1139 lwkt_port_t port;
1140
1141 COMMON_START(so, inp, 0);
1142
1143 /*
1144 * Reconnect our pcb if we have to
1145 */
1146 if (msg->connect.nm_flags & PRUC_RECONNECT) {
1147 msg->connect.nm_flags &= ~PRUC_RECONNECT;
1148 TCP_STATE_MIGRATE_END(tp);
1149 in_pcblink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1150 } else {
1151 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1152 error = EISCONN;
1153 if (so->so_state & SS_ISCONNECTING)
1154 error = EALREADY;
1155 goto out;
1156 }
1157 KASSERT(inp->inp_fport == 0, ("invalid fport"));
1158 }
1159
1160 /*
1161 * Select local port, if it is not yet selected.
1162 */
1163 if (inp->inp_lport == 0) {
1164 KKASSERT(inp->inp_laddr.s_addr == INADDR_ANY);
1165
1166 error = in_pcbladdr(inp, nam, &if_sin, td);
1167 if (error)
1168 goto out;
1169 inp->inp_laddr.s_addr = if_sin->sin_addr.s_addr;
1170 msg->connect.nm_flags |= PRUC_HASLADDR;
1171
1172 /*
1173 * Install faddr/fport earlier, so that when this
1174 * inpcb is installed on to the lport hash, the
1175 * 4-tuple contains correct value.
1176 *
1177 * NOTE: The faddr/fport will have to be installed
1178 * after the in_pcbladdr(), which may change them.
1179 */
1180 inp->inp_faddr = sin->sin_addr;
1181 inp->inp_fport = sin->sin_port;
1182
1183 error = in_pcbbind_remote(inp, nam, td);
1184 if (error)
1185 goto out;
1186 }
1187
1188 if ((msg->connect.nm_flags & PRUC_HASLADDR) == 0) {
1189 /*
1190 * Rarely used path:
1191 * This inpcb was bound before this connect.
1192 */
1193 error = in_pcbladdr(inp, nam, &if_sin, td);
1194 if (error)
1195 goto out;
1196
1197 /*
1198 * Save or refresh the faddr/fport, since they may
1199 * be changed by in_pcbladdr().
1200 */
1201 inp->inp_faddr = sin->sin_addr;
1202 inp->inp_fport = sin->sin_port;
1203 }
1204 #ifdef INVARIANTS
1205 else {
1206 KASSERT(inp->inp_faddr.s_addr == sin->sin_addr.s_addr,
1207 ("faddr mismatch for reconnect"));
1208 KASSERT(inp->inp_fport == sin->sin_port,
1209 ("fport mismatch for reconnect"));
1210 }
1211 #endif
1212 KKASSERT(inp->inp_socket == so);
1213
1214 hash = tcp_addrhash(sin->sin_addr.s_addr, sin->sin_port,
1215 (inp->inp_laddr.s_addr != INADDR_ANY ?
1216 inp->inp_laddr.s_addr : if_sin->sin_addr.s_addr),
1217 inp->inp_lport);
1218 port = netisr_hashport(hash);
1219
1220 if (port != &curthread->td_msgport) {
1221 lwkt_msg_t lmsg = &msg->connect.base.lmsg;
1222
1223 /*
1224 * in_pcbladdr() may have allocated a route entry for us
1225 * on the current CPU, but we need a route entry on the
1226 * inpcb's owner CPU, so free it here.
1227 */
1228 in_pcbresetroute(inp);
1229
1230 /*
1231 * We are moving the protocol processing port the socket
1232 * is on, we have to unlink here and re-link on the
1233 * target cpu.
1234 */
1235 in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1236 msg->connect.nm_flags |= PRUC_RECONNECT;
1237 msg->connect.base.nm_dispatch = tcp_connect;
1238
1239 TCP_STATE_MIGRATE_START(tp);
1240
1241 /*
1242 * Use message put done receipt to change this socket's
1243 * so_port, i.e. _after_ this message was put onto the
1244 * target netisr's msgport but _before_ the message could
1245 * be pulled from the target netisr's msgport, so that:
1246 * - The upper half (socket code) will not see the new
1247 * msgport before this message reaches the new msgport
1248 * and messages for this socket will be ordered.
1249 * - This message will see the new msgport, when its
1250 * handler is called in the target netisr.
1251 *
1252 * NOTE:
1253 * We MUST use messege put done receipt to change this
1254 * socket's so_port:
1255 * If we changed the so_port in this netisr after the
1256 * lwkt_forwardmsg (so messages for this socket will be
1257 * ordered) and changed the so_port in the target netisr
1258 * at the very beginning of this message's handler, we
1259 * would suffer so_port overwritten race, given this
1260 * message might be forwarded again.
1261 *
1262 * NOTE:
1263 * This mechanism depends on that the netisr's msgport
1264 * is spin msgport (currently it is :).
1265 *
1266 * If the upper half saw the new msgport before this
1267 * message reached the target netisr's msgport, the
1268 * messages sent from the upper half could reach the new
1269 * msgport before this message, thus there would be
1270 * message reordering. The worst case could be soclose()
1271 * saw the new msgport and the detach message could reach
1272 * the new msgport before this message, i.e. the inpcb
1273 * could have been destroyed when this message was still
1274 * pending on or on its way to the new msgport. Other
1275 * weird cases could also happen, e.g. inpcb->inp_pcbinfo,
1276 * since we have unlinked this inpcb from the current
1277 * pcbinfo first.
1278 */
1279 lwkt_setmsg_receipt(lmsg, tcp_sosetport);
1280 lwkt_forwardmsg(port, lmsg);
1281 /* msg invalid now */
1282 return;
1283 } else if (msg->connect.nm_flags & PRUC_HELDTD) {
1284 /*
1285 * The original thread is no longer needed; release it.
1286 */
1287 lwkt_rele(td);
1288 msg->connect.nm_flags &= ~PRUC_HELDTD;
1289 }
1290 error = tcp_connect_oncpu(tp, msg->connect.nm_sndflags,
1291 msg->connect.nm_m, sin, if_sin, hash);
1292 msg->connect.nm_m = NULL;
1293 out:
1294 if (msg->connect.nm_m) {
1295 m_freem(msg->connect.nm_m);
1296 msg->connect.nm_m = NULL;
1297 }
1298 if (msg->connect.nm_flags & PRUC_HELDTD)
1299 lwkt_rele(td);
1300 if (error && (msg->connect.nm_flags & PRUC_ASYNC)) {
1301 so->so_error = error;
1302 soisdisconnected(so);
1303 }
1304 lwkt_replymsg(&msg->connect.base.lmsg, error);
1305 /* msg invalid now */
1306 }
1307
1308 #ifdef INET6
1309
1310 static void
tcp6_connect(netmsg_t msg)1311 tcp6_connect(netmsg_t msg)
1312 {
1313 struct tcpcb *tp;
1314 struct socket *so = msg->connect.base.nm_so;
1315 struct sockaddr *nam = msg->connect.nm_nam;
1316 struct thread *td = msg->connect.nm_td;
1317 struct inpcb *inp;
1318 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
1319 struct in6_addr *addr6;
1320 lwkt_port_t port;
1321 int error;
1322
1323 COMMON_START(so, inp, 0);
1324
1325 /*
1326 * Reconnect our pcb if we have to
1327 */
1328 if (msg->connect.nm_flags & PRUC_RECONNECT) {
1329 msg->connect.nm_flags &= ~PRUC_RECONNECT;
1330 TCP_STATE_MIGRATE_END(tp);
1331 in_pcblink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1332 }
1333
1334 /*
1335 * Bind if we have to
1336 */
1337 if (inp->inp_lport == 0) {
1338 error = in6_pcbbind(inp, NULL, td);
1339 if (error)
1340 goto out;
1341 }
1342
1343 /*
1344 * Cannot simply call in_pcbconnect, because there might be an
1345 * earlier incarnation of this same connection still in
1346 * TIME_WAIT state, creating an ADDRINUSE error.
1347 */
1348 error = in6_pcbladdr(inp, nam, &addr6, td);
1349 if (error)
1350 goto out;
1351
1352 port = tcp6_addrport(); /* XXX hack for now, always cpu0 */
1353
1354 if (port != &curthread->td_msgport) {
1355 lwkt_msg_t lmsg = &msg->connect.base.lmsg;
1356
1357 /*
1358 * in_pcbladdr() may have allocated a route entry for us
1359 * on the current CPU, but we need a route entry on the
1360 * inpcb's owner CPU, so free it here.
1361 */
1362 in_pcbresetroute(inp);
1363
1364 in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1365 msg->connect.nm_flags |= PRUC_RECONNECT;
1366 msg->connect.base.nm_dispatch = tcp6_connect;
1367
1368 TCP_STATE_MIGRATE_START(tp);
1369
1370 /* See the related comment in tcp_connect() */
1371 lwkt_setmsg_receipt(lmsg, tcp_sosetport);
1372 lwkt_forwardmsg(port, lmsg);
1373 /* msg invalid now */
1374 return;
1375 }
1376 error = tcp6_connect_oncpu(tp, msg->connect.nm_sndflags,
1377 &msg->connect.nm_m, sin6, addr6);
1378 /* nm_m may still be intact */
1379 out:
1380 if (msg->connect.nm_m) {
1381 m_freem(msg->connect.nm_m);
1382 msg->connect.nm_m = NULL;
1383 }
1384 lwkt_replymsg(&msg->connect.base.lmsg, error);
1385 /* msg invalid now */
1386 }
1387
1388 static int
tcp6_connect_oncpu(struct tcpcb * tp,int flags,struct mbuf ** mp,struct sockaddr_in6 * sin6,struct in6_addr * addr6)1389 tcp6_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf **mp,
1390 struct sockaddr_in6 *sin6, struct in6_addr *addr6)
1391 {
1392 struct mbuf *m = *mp;
1393 struct inpcb *inp = tp->t_inpcb;
1394 struct socket *so = inp->inp_socket;
1395 struct inpcb *oinp;
1396
1397 /*
1398 * Cannot simply call in_pcbconnect, because there might be an
1399 * earlier incarnation of this same connection still in
1400 * TIME_WAIT state, creating an ADDRINUSE error.
1401 */
1402 oinp = in6_pcblookup_hash(inp->inp_pcbinfo,
1403 &sin6->sin6_addr, sin6->sin6_port,
1404 (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) ?
1405 addr6 : &inp->in6p_laddr),
1406 inp->inp_lport, 0, NULL);
1407 if (oinp)
1408 return (EADDRINUSE);
1409
1410 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
1411 inp->in6p_laddr = *addr6;
1412 inp->in6p_faddr = sin6->sin6_addr;
1413 inp->inp_fport = sin6->sin6_port;
1414 if ((sin6->sin6_flowinfo & IPV6_FLOWINFO_MASK) != 0)
1415 inp->in6p_flowinfo = sin6->sin6_flowinfo;
1416 in_pcbinsconnhash(inp);
1417
1418 /*
1419 * Now that no more errors can occur, change the protocol processing
1420 * port to the current thread (which is the correct thread).
1421 *
1422 * Create TCP timer message now; we are on the tcpcb's owner
1423 * CPU/thread.
1424 */
1425 tcp_create_timermsg(tp, &curthread->td_msgport);
1426
1427 /* Compute window scaling to request. */
1428 if (tp->request_r_scale < TCP_MIN_WINSHIFT)
1429 tp->request_r_scale = TCP_MIN_WINSHIFT;
1430 while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1431 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat) {
1432 tp->request_r_scale++;
1433 }
1434
1435 soisconnecting(so);
1436 tcpstat.tcps_connattempt++;
1437 TCP_STATE_CHANGE(tp, TCPS_SYN_SENT);
1438 tcp_callout_reset(tp, tp->tt_keep, tp->t_keepinit, tcp_timer_keep);
1439 tp->iss = tcp_new_isn(tp);
1440 tcp_sendseqinit(tp);
1441 if (m) {
1442 ssb_appendstream(&so->so_snd, m);
1443 *mp = NULL;
1444 if (flags & PRUS_OOB)
1445 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc;
1446 }
1447
1448 /*
1449 * Close the send side of the connection after
1450 * the data is sent if flagged.
1451 */
1452 if ((flags & (PRUS_OOB|PRUS_EOF)) == PRUS_EOF) {
1453 socantsendmore(so);
1454 tp = tcp_usrclosed(tp);
1455 }
1456 return (tcp_output(tp));
1457 }
1458
1459 #endif /* INET6 */
1460
1461 /*
1462 * The new sockopt interface makes it possible for us to block in the
1463 * copyin/out step (if we take a page fault). Taking a page fault while
1464 * in a critical section is probably a Bad Thing. (Since sockets and pcbs
1465 * both now use TSM, there probably isn't any need for this function to
1466 * run in a critical section any more. This needs more examination.)
1467 */
1468 void
tcp_ctloutput(netmsg_t msg)1469 tcp_ctloutput(netmsg_t msg)
1470 {
1471 struct socket *so = msg->base.nm_so;
1472 struct sockopt *sopt = msg->ctloutput.nm_sopt;
1473 struct thread *td = NULL;
1474 int error, opt, optval, opthz;
1475 struct inpcb *inp;
1476 struct tcpcb *tp;
1477
1478 if (msg->ctloutput.nm_flags & PRCO_HELDTD)
1479 td = sopt->sopt_td;
1480
1481 error = 0;
1482 inp = so->so_pcb;
1483 if (inp == NULL) {
1484 error = ECONNRESET;
1485 goto done;
1486 }
1487 tp = intotcpcb(inp);
1488
1489 /* Get socket's owner cpuid hint */
1490 if (sopt->sopt_level == SOL_SOCKET &&
1491 sopt->sopt_dir == SOPT_GET &&
1492 sopt->sopt_name == SO_CPUHINT) {
1493 if (tp->t_flags & TF_LISTEN) {
1494 /*
1495 * Listen sockets owner cpuid is always 0,
1496 * which does not make sense if SO_REUSEPORT
1497 * is not set.
1498 *
1499 * NOTE: inp_lgrpindex is _not_ assigned in jail.
1500 */
1501 if ((so->so_options & SO_REUSEPORT) &&
1502 inp->inp_lgrpindex >= 0)
1503 optval = inp->inp_lgrpindex % netisr_ncpus;
1504 else
1505 optval = -1; /* no hint */
1506 } else {
1507 optval = mycpuid;
1508 }
1509 soopt_from_kbuf(sopt, &optval, sizeof(optval));
1510 goto done;
1511 }
1512
1513 if (sopt->sopt_level != IPPROTO_TCP) {
1514 if (sopt->sopt_level == IPPROTO_IP) {
1515 switch (sopt->sopt_name) {
1516 case IP_MULTICAST_IF:
1517 case IP_MULTICAST_VIF:
1518 case IP_MULTICAST_TTL:
1519 case IP_MULTICAST_LOOP:
1520 case IP_ADD_MEMBERSHIP:
1521 case IP_DROP_MEMBERSHIP:
1522 /*
1523 * Multicast does not make sense on
1524 * TCP sockets.
1525 */
1526 error = EOPNOTSUPP;
1527 goto done;
1528 }
1529 }
1530 #ifdef INET6
1531 if (INP_CHECK_SOCKAF(so, AF_INET6))
1532 ip6_ctloutput_dispatch(msg);
1533 else
1534 #endif /* INET6 */
1535 ip_ctloutput(msg);
1536 /* msg invalid now */
1537 if (td != NULL)
1538 lwkt_rele(td);
1539 return;
1540 }
1541
1542 switch (sopt->sopt_dir) {
1543 case SOPT_SET:
1544 error = soopt_to_kbuf(sopt, &optval, sizeof optval,
1545 sizeof optval);
1546 if (error)
1547 break;
1548 switch (sopt->sopt_name) {
1549 case TCP_FASTKEEP:
1550 if (optval > 0)
1551 tp->t_keepidle = tp->t_keepintvl;
1552 else
1553 tp->t_keepidle = tcp_keepidle;
1554 tcp_timer_keep_activity(tp, 0);
1555 break;
1556 #ifdef TCP_SIGNATURE
1557 case TCP_SIGNATURE_ENABLE:
1558 if (tp->t_state == TCPS_CLOSED) {
1559 /*
1560 * This is the only safe state that this
1561 * option could be changed. Some segments
1562 * could already have been sent in other
1563 * states.
1564 */
1565 if (optval > 0)
1566 tp->t_flags |= TF_SIGNATURE;
1567 else
1568 tp->t_flags &= ~TF_SIGNATURE;
1569 } else {
1570 error = EOPNOTSUPP;
1571 }
1572 break;
1573 #endif /* TCP_SIGNATURE */
1574 case TCP_NODELAY:
1575 case TCP_NOOPT:
1576 switch (sopt->sopt_name) {
1577 case TCP_NODELAY:
1578 opt = TF_NODELAY;
1579 break;
1580 case TCP_NOOPT:
1581 opt = TF_NOOPT;
1582 break;
1583 default:
1584 opt = 0; /* dead code to fool gcc */
1585 break;
1586 }
1587
1588 if (optval)
1589 tp->t_flags |= opt;
1590 else
1591 tp->t_flags &= ~opt;
1592 break;
1593
1594 case TCP_NOPUSH:
1595 if (tcp_disable_nopush)
1596 break;
1597 if (optval)
1598 tp->t_flags |= TF_NOPUSH;
1599 else {
1600 tp->t_flags &= ~TF_NOPUSH;
1601 error = tcp_output(tp);
1602 }
1603 break;
1604
1605 case TCP_MAXSEG:
1606 /*
1607 * Must be between 0 and maxseg. If the requested
1608 * maxseg is too small to satisfy the desired minmss,
1609 * pump it up (silently so sysctl modifications of
1610 * minmss do not create unexpected program failures).
1611 * Handle degenerate cases.
1612 */
1613 if (optval > 0 && optval <= tp->t_maxseg) {
1614 if (optval + 40 < tcp_minmss) {
1615 optval = tcp_minmss - 40;
1616 if (optval < 0)
1617 optval = 1;
1618 }
1619 tp->t_maxseg = optval;
1620 } else {
1621 error = EINVAL;
1622 }
1623 break;
1624
1625 case TCP_KEEPINIT:
1626 case TCP_KEEPIDLE:
1627 case TCP_KEEPINTVL:
1628 if (optval < 1 || optval > MAXKEEPALIVE) {
1629 error = EINVAL;
1630 break;
1631 }
1632 opthz = optval * hz;
1633
1634 switch (sopt->sopt_name) {
1635 case TCP_KEEPINIT:
1636 tp->t_keepinit = opthz;
1637 break;
1638 case TCP_KEEPIDLE:
1639 tp->t_keepidle = opthz;
1640 tcp_timer_keep_activity(tp, 0);
1641 break;
1642 case TCP_KEEPINTVL:
1643 tp->t_keepintvl = opthz;
1644 tp->t_maxidle = tp->t_keepintvl * tp->t_keepcnt;
1645 break;
1646 }
1647 break;
1648
1649 case TCP_KEEPCNT:
1650 if (optval < 1 || optval > MAXKEEPCNT) {
1651 error = EINVAL;
1652 break;
1653 }
1654 tp->t_keepcnt = optval;
1655 tp->t_maxidle = tp->t_keepintvl * tp->t_keepcnt;
1656 break;
1657
1658 default:
1659 error = ENOPROTOOPT;
1660 break;
1661 }
1662 break;
1663
1664 case SOPT_GET:
1665 switch (sopt->sopt_name) {
1666 #ifdef TCP_SIGNATURE
1667 case TCP_SIGNATURE_ENABLE:
1668 optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0;
1669 break;
1670 #endif /* TCP_SIGNATURE */
1671 case TCP_NODELAY:
1672 optval = tp->t_flags & TF_NODELAY;
1673 break;
1674 case TCP_MAXSEG:
1675 optval = tp->t_maxseg;
1676 break;
1677 case TCP_NOOPT:
1678 optval = tp->t_flags & TF_NOOPT;
1679 break;
1680 case TCP_NOPUSH:
1681 optval = tp->t_flags & TF_NOPUSH;
1682 break;
1683 case TCP_KEEPINIT:
1684 optval = tp->t_keepinit / hz;
1685 break;
1686 case TCP_KEEPIDLE:
1687 optval = tp->t_keepidle / hz;
1688 break;
1689 case TCP_KEEPINTVL:
1690 optval = tp->t_keepintvl / hz;
1691 break;
1692 case TCP_KEEPCNT:
1693 optval = tp->t_keepcnt;
1694 break;
1695 default:
1696 error = ENOPROTOOPT;
1697 break;
1698 }
1699 if (error == 0)
1700 soopt_from_kbuf(sopt, &optval, sizeof optval);
1701 break;
1702 }
1703 done:
1704 if (td != NULL)
1705 lwkt_rele(td);
1706 lwkt_replymsg(&msg->lmsg, error);
1707 }
1708
1709 struct netmsg_tcp_ctloutput {
1710 struct netmsg_pr_ctloutput ctloutput;
1711 struct sockopt sopt;
1712 int sopt_val;
1713 };
1714
1715 /*
1716 * Allocate netmsg_pr_ctloutput for asynchronous tcp_ctloutput.
1717 */
1718 struct netmsg_pr_ctloutput *
tcp_ctloutmsg(struct sockopt * sopt)1719 tcp_ctloutmsg(struct sockopt *sopt)
1720 {
1721 struct netmsg_tcp_ctloutput *msg;
1722 int flags = 0, error;
1723
1724 KASSERT(sopt->sopt_dir == SOPT_SET, ("not from ctloutput"));
1725
1726 /* Only small set of options allows asynchronous setting. */
1727 if (sopt->sopt_level != IPPROTO_TCP)
1728 return NULL;
1729 switch (sopt->sopt_name) {
1730 case TCP_NODELAY:
1731 case TCP_NOOPT:
1732 case TCP_NOPUSH:
1733 case TCP_FASTKEEP:
1734 break;
1735 default:
1736 return NULL;
1737 }
1738
1739 msg = kmalloc(sizeof(*msg), M_LWKTMSG, M_WAITOK | M_NULLOK);
1740 if (msg == NULL) {
1741 /* Fallback to synchronous tcp_ctloutput */
1742 return NULL;
1743 }
1744
1745 /* Save the sockopt */
1746 msg->sopt = *sopt;
1747
1748 /* Fixup the sopt.sopt_val ptr */
1749 error = sooptcopyin(sopt, &msg->sopt_val,
1750 sizeof(msg->sopt_val), sizeof(msg->sopt_val));
1751 if (error) {
1752 kfree(msg, M_LWKTMSG);
1753 return NULL;
1754 }
1755 msg->sopt.sopt_val = &msg->sopt_val;
1756
1757 /* Hold the current thread */
1758 if (msg->sopt.sopt_td != NULL) {
1759 flags |= PRCO_HELDTD;
1760 lwkt_hold(msg->sopt.sopt_td);
1761 }
1762
1763 msg->ctloutput.nm_flags = flags;
1764 msg->ctloutput.nm_sopt = &msg->sopt;
1765
1766 return &msg->ctloutput;
1767 }
1768
1769 /*
1770 * tcp_sendspace and tcp_recvspace are the default send and receive window
1771 * sizes, respectively. These are obsolescent (this information should
1772 * be set by the route).
1773 *
1774 * Use a default that does not require tcp window scaling to be turned
1775 * on. Individual programs or the administrator can increase the default.
1776 */
1777 u_long tcp_sendspace = 57344; /* largest multiple of PAGE_SIZE < 64k */
1778 SYSCTL_INT(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW,
1779 &tcp_sendspace , 0, "Maximum outgoing TCP datagram size");
1780 u_long tcp_recvspace = 57344; /* largest multiple of PAGE_SIZE < 64k */
1781 SYSCTL_INT(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
1782 &tcp_recvspace , 0, "Maximum incoming TCP datagram size");
1783
1784 /*
1785 * Attach TCP protocol to socket, allocating internet protocol control
1786 * block, tcp control block, buffer space, and entering CLOSED state.
1787 */
1788 static int
tcp_attach(struct socket * so,struct pru_attach_info * ai)1789 tcp_attach(struct socket *so, struct pru_attach_info *ai)
1790 {
1791 struct inpcb *inp;
1792 int error;
1793 int cpu;
1794 #ifdef INET6
1795 boolean_t isipv6 = INP_CHECK_SOCKAF(so, AF_INET6);
1796 #endif
1797
1798 if (ai != NULL) {
1799 error = tcp_usr_preattach(so, 0 /* don't care */, ai);
1800 if (error)
1801 return (error);
1802 } else {
1803 /* Post attach; do nothing */
1804 }
1805
1806 cpu = mycpu->gd_cpuid;
1807
1808 /*
1809 * Set the default pcbinfo. This will likely change when we
1810 * bind/connect.
1811 */
1812 error = in_pcballoc(so, &tcbinfo[cpu]);
1813 if (error)
1814 return (error);
1815 inp = so->so_pcb;
1816 #ifdef INET6
1817 if (isipv6)
1818 inp->in6p_hops = -1; /* use kernel default */
1819 #endif
1820 tcp_newtcpcb(inp);
1821 /* Keep a reference for asynchronized pru_rcvd */
1822 soreference(so);
1823 return (0);
1824 }
1825
1826 /*
1827 * Initiate (or continue) disconnect.
1828 * If embryonic state, just send reset (once).
1829 * If in ``let data drain'' option and linger null, just drop.
1830 * Otherwise (hard), mark socket disconnecting and drop
1831 * current input data; switch states based on user close, and
1832 * send segment to peer (with FIN).
1833 */
1834 static struct tcpcb *
tcp_disconnect(struct tcpcb * tp)1835 tcp_disconnect(struct tcpcb *tp)
1836 {
1837 struct socket *so = tp->t_inpcb->inp_socket;
1838
1839 if (tp->t_state < TCPS_ESTABLISHED) {
1840 tp = tcp_close(tp);
1841 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
1842 tp = tcp_drop(tp, 0);
1843 } else {
1844 lwkt_gettoken(&so->so_rcv.ssb_token);
1845 soisdisconnecting(so);
1846 sbflush(&so->so_rcv.sb);
1847 tp = tcp_usrclosed(tp);
1848 if (tp)
1849 tcp_output(tp);
1850 lwkt_reltoken(&so->so_rcv.ssb_token);
1851 }
1852 return (tp);
1853 }
1854
1855 /*
1856 * User issued close, and wish to trail through shutdown states:
1857 * if never received SYN, just forget it. If got a SYN from peer,
1858 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
1859 * If already got a FIN from peer, then almost done; go to LAST_ACK
1860 * state. In all other cases, have already sent FIN to peer (e.g.
1861 * after PRU_SHUTDOWN), and just have to play tedious game waiting
1862 * for peer to send FIN or not respond to keep-alives, etc.
1863 * We can let the user exit from the close as soon as the FIN is acked.
1864 */
1865 static struct tcpcb *
tcp_usrclosed(struct tcpcb * tp)1866 tcp_usrclosed(struct tcpcb *tp)
1867 {
1868
1869 switch (tp->t_state) {
1870
1871 case TCPS_CLOSED:
1872 case TCPS_LISTEN:
1873 TCP_STATE_CHANGE(tp, TCPS_CLOSED);
1874 tp = tcp_close(tp);
1875 break;
1876
1877 case TCPS_SYN_SENT:
1878 case TCPS_SYN_RECEIVED:
1879 tp->t_flags |= TF_NEEDFIN;
1880 break;
1881
1882 case TCPS_ESTABLISHED:
1883 TCP_STATE_CHANGE(tp, TCPS_FIN_WAIT_1);
1884 break;
1885
1886 case TCPS_CLOSE_WAIT:
1887 TCP_STATE_CHANGE(tp, TCPS_LAST_ACK);
1888 break;
1889 }
1890 if (tp && tp->t_state >= TCPS_FIN_WAIT_2) {
1891 soisdisconnected(tp->t_inpcb->inp_socket);
1892 /* To prevent the connection hanging in FIN_WAIT_2 forever. */
1893 if (tp->t_state == TCPS_FIN_WAIT_2) {
1894 tcp_callout_reset(tp, tp->tt_2msl, tp->t_maxidle,
1895 tcp_timer_2msl);
1896 }
1897 }
1898 return (tp);
1899 }
1900