1 /*-
2 * Copyright (c) 1982, 1986, 1988, 1993
3 * The Regents of the University of California.
4 * Copyright (c) 2006-2007 Robert N. M. Watson
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 4. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * From: @(#)tcp_usrreq.c 8.2 (Berkeley) 1/3/94
32 */
33
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD: releng/8.0/sys/netinet/tcp_usrreq.c 196019 2009-08-01 19:26:27Z rwatson $");
36
37 #include "opt_ddb.h"
38 #include "opt_inet.h"
39 #include "opt_inet6.h"
40 #include "opt_tcpdebug.h"
41
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/malloc.h>
45 #include <sys/kernel.h>
46 #include <sys/sysctl.h>
47 #include <sys/mbuf.h>
48 #ifdef INET6
49 #include <sys/domain.h>
50 #endif /* INET6 */
51 #include <sys/socket.h>
52 #include <sys/socketvar.h>
53 #include <sys/protosw.h>
54 #include <sys/proc.h>
55 #include <sys/jail.h>
56
57 #ifdef DDB
58 #include <ddb/ddb.h>
59 #endif
60
61 #include <net/if.h>
62 #include <net/route.h>
63 #include <net/vnet.h>
64
65 #include <netinet/in.h>
66 #include <netinet/in_systm.h>
67 #ifdef INET6
68 #include <netinet/ip6.h>
69 #endif
70 #include <netinet/in_pcb.h>
71 #ifdef INET6
72 #include <netinet6/in6_pcb.h>
73 #endif
74 #include <netinet/in_var.h>
75 #include <netinet/ip_var.h>
76 #ifdef INET6
77 #include <netinet6/ip6_var.h>
78 #include <netinet6/scope6_var.h>
79 #endif
80 #include <netinet/tcp.h>
81 #include <netinet/tcp_fsm.h>
82 #include <netinet/tcp_seq.h>
83 #include <netinet/tcp_timer.h>
84 #include <netinet/tcp_var.h>
85 #include <netinet/tcpip.h>
86 #ifdef TCPDEBUG
87 #include <netinet/tcp_debug.h>
88 #endif
89 #include <netinet/tcp_offload.h>
90
91 /*
92 * TCP protocol interface to socket abstraction.
93 */
94 static int tcp_attach(struct socket *);
95 static int tcp_connect(struct tcpcb *, struct sockaddr *,
96 struct thread *td);
97 #ifdef INET6
98 static int tcp6_connect(struct tcpcb *, struct sockaddr *,
99 struct thread *td);
100 #endif /* INET6 */
101 static void tcp_disconnect(struct tcpcb *);
102 static void tcp_usrclosed(struct tcpcb *);
103 static void tcp_fill_info(struct tcpcb *, struct tcp_info *);
104
105 #ifdef TCPDEBUG
106 #define TCPDEBUG0 int ostate = 0
107 #define TCPDEBUG1() ostate = tp ? tp->t_state : 0
108 #define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \
109 tcp_trace(TA_USER, ostate, tp, 0, 0, req)
110 #else
111 #define TCPDEBUG0
112 #define TCPDEBUG1()
113 #define TCPDEBUG2(req)
114 #endif
115
116 /*
117 * TCP attaches to socket via pru_attach(), reserving space,
118 * and an internet control block.
119 */
120 static int
121 tcp_usr_attach(struct socket *so, int proto, struct thread *td)
122 {
123 struct inpcb *inp;
124 struct tcpcb *tp = NULL;
125 int error;
126 TCPDEBUG0;
127
128 inp = sotoinpcb(so);
129 KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL"));
130 TCPDEBUG1();
131
132 error = tcp_attach(so);
133 if (error)
134 goto out;
135
136 if ((so->so_options & SO_LINGER) && so->so_linger == 0)
137 so->so_linger = TCP_LINGERTIME;
138
139 inp = sotoinpcb(so);
140 tp = intotcpcb(inp);
141 out:
142 TCPDEBUG2(PRU_ATTACH);
143 return error;
144 }
145
146 /*
147 * tcp_detach is called when the socket layer loses its final reference
148 * to the socket, be it a file descriptor reference, a reference from TCP,
149 * etc. At this point, there is only one case in which we will keep around
150 * inpcb state: time wait.
151 *
152 * This function can probably be re-absorbed back into tcp_usr_detach() now
153 * that there is a single detach path.
154 */
155 static void
156 tcp_detach(struct socket *so, struct inpcb *inp)
157 {
158 struct tcpcb *tp;
159
160 INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
161 INP_WLOCK_ASSERT(inp);
162
163 KASSERT(so->so_pcb == inp, ("tcp_detach: so_pcb != inp"));
164 KASSERT(inp->inp_socket == so, ("tcp_detach: inp_socket != so"));
165
166 tp = intotcpcb(inp);
167
168 if (inp->inp_flags & INP_TIMEWAIT) {
169 /*
170 * There are two cases to handle: one in which the time wait
171 * state is being discarded (INP_DROPPED), and one in which
172 * this connection will remain in timewait. In the former,
173 * it is time to discard all state (except tcptw, which has
174 * already been discarded by the timewait close code, which
175 * should be further up the call stack somewhere). In the
176 * latter case, we detach from the socket, but leave the pcb
177 * present until timewait ends.
178 *
179 * XXXRW: Would it be cleaner to free the tcptw here?
180 */
181 if (inp->inp_flags & INP_DROPPED) {
182 KASSERT(tp == NULL, ("tcp_detach: INP_TIMEWAIT && "
183 "INP_DROPPED && tp != NULL"));
184 in_pcbdetach(inp);
185 in_pcbfree(inp);
186 } else {
187 in_pcbdetach(inp);
188 INP_WUNLOCK(inp);
189 }
190 } else {
191 /*
192 * If the connection is not in timewait, we consider two
193 * two conditions: one in which no further processing is
194 * necessary (dropped || embryonic), and one in which TCP is
195 * not yet done, but no longer requires the socket, so the
196 * pcb will persist for the time being.
197 *
198 * XXXRW: Does the second case still occur?
199 */
200 if (inp->inp_flags & INP_DROPPED ||
201 tp->t_state < TCPS_SYN_SENT) {
202 tcp_discardcb(tp);
203 in_pcbdetach(inp);
204 in_pcbfree(inp);
205 } else
206 in_pcbdetach(inp);
207 }
208 }
209
210 /*
211 * pru_detach() detaches the TCP protocol from the socket.
212 * If the protocol state is non-embryonic, then can't
213 * do this directly: have to initiate a pru_disconnect(),
214 * which may finish later; embryonic TCB's can just
215 * be discarded here.
216 */
217 static void
218 tcp_usr_detach(struct socket *so)
219 {
220 struct inpcb *inp;
221
222 inp = sotoinpcb(so);
223 KASSERT(inp != NULL, ("tcp_usr_detach: inp == NULL"));
224 INP_INFO_WLOCK(&V_tcbinfo);
225 INP_WLOCK(inp);
226 KASSERT(inp->inp_socket != NULL,
227 ("tcp_usr_detach: inp_socket == NULL"));
228 tcp_detach(so, inp);
229 INP_INFO_WUNLOCK(&V_tcbinfo);
230 }
231
232 /*
233 * Give the socket an address.
234 */
235 static int
236 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
237 {
238 int error = 0;
239 struct inpcb *inp;
240 struct tcpcb *tp = NULL;
241 struct sockaddr_in *sinp;
242
243 sinp = (struct sockaddr_in *)nam;
244 if (nam->sa_len != sizeof (*sinp))
245 return (EINVAL);
246 /*
247 * Must check for multicast addresses and disallow binding
248 * to them.
249 */
250 if (sinp->sin_family == AF_INET &&
251 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
252 return (EAFNOSUPPORT);
253
254 TCPDEBUG0;
255 INP_INFO_WLOCK(&V_tcbinfo);
256 inp = sotoinpcb(so);
257 KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL"));
258 INP_WLOCK(inp);
259 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
260 error = EINVAL;
261 goto out;
262 }
263 tp = intotcpcb(inp);
264 TCPDEBUG1();
265 error = in_pcbbind(inp, nam, td->td_ucred);
266 out:
267 TCPDEBUG2(PRU_BIND);
268 INP_WUNLOCK(inp);
269 INP_INFO_WUNLOCK(&V_tcbinfo);
270
271 return (error);
272 }
273
274 #ifdef INET6
275 static int
276 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
277 {
278 int error = 0;
279 struct inpcb *inp;
280 struct tcpcb *tp = NULL;
281 struct sockaddr_in6 *sin6p;
282
283 sin6p = (struct sockaddr_in6 *)nam;
284 if (nam->sa_len != sizeof (*sin6p))
285 return (EINVAL);
286 /*
287 * Must check for multicast addresses and disallow binding
288 * to them.
289 */
290 if (sin6p->sin6_family == AF_INET6 &&
291 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr))
292 return (EAFNOSUPPORT);
293
294 TCPDEBUG0;
295 INP_INFO_WLOCK(&V_tcbinfo);
296 inp = sotoinpcb(so);
297 KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL"));
298 INP_WLOCK(inp);
299 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
300 error = EINVAL;
301 goto out;
302 }
303 tp = intotcpcb(inp);
304 TCPDEBUG1();
305 inp->inp_vflag &= ~INP_IPV4;
306 inp->inp_vflag |= INP_IPV6;
307 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
308 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr))
309 inp->inp_vflag |= INP_IPV4;
310 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
311 struct sockaddr_in sin;
312
313 in6_sin6_2_sin(&sin, sin6p);
314 inp->inp_vflag |= INP_IPV4;
315 inp->inp_vflag &= ~INP_IPV6;
316 error = in_pcbbind(inp, (struct sockaddr *)&sin,
317 td->td_ucred);
318 goto out;
319 }
320 }
321 error = in6_pcbbind(inp, nam, td->td_ucred);
322 out:
323 TCPDEBUG2(PRU_BIND);
324 INP_WUNLOCK(inp);
325 INP_INFO_WUNLOCK(&V_tcbinfo);
326 return (error);
327 }
328 #endif /* INET6 */
329
330 /*
331 * Prepare to accept connections.
332 */
333 static int
334 tcp_usr_listen(struct socket *so, int backlog, struct thread *td)
335 {
336 int error = 0;
337 struct inpcb *inp;
338 struct tcpcb *tp = NULL;
339
340 TCPDEBUG0;
341 INP_INFO_WLOCK(&V_tcbinfo);
342 inp = sotoinpcb(so);
343 KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL"));
344 INP_WLOCK(inp);
345 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
346 error = EINVAL;
347 goto out;
348 }
349 tp = intotcpcb(inp);
350 TCPDEBUG1();
351 SOCK_LOCK(so);
352 error = solisten_proto_check(so);
353 if (error == 0 && inp->inp_lport == 0)
354 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
355 if (error == 0) {
356 tp->t_state = TCPS_LISTEN;
357 solisten_proto(so, backlog);
358 tcp_offload_listen_open(tp);
359 }
360 SOCK_UNLOCK(so);
361
362 out:
363 TCPDEBUG2(PRU_LISTEN);
364 INP_WUNLOCK(inp);
365 INP_INFO_WUNLOCK(&V_tcbinfo);
366 return (error);
367 }
368
369 #ifdef INET6
370 static int
371 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td)
372 {
373 int error = 0;
374 struct inpcb *inp;
375 struct tcpcb *tp = NULL;
376
377 TCPDEBUG0;
378 INP_INFO_WLOCK(&V_tcbinfo);
379 inp = sotoinpcb(so);
380 KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL"));
381 INP_WLOCK(inp);
382 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
383 error = EINVAL;
384 goto out;
385 }
386 tp = intotcpcb(inp);
387 TCPDEBUG1();
388 SOCK_LOCK(so);
389 error = solisten_proto_check(so);
390 if (error == 0 && inp->inp_lport == 0) {
391 inp->inp_vflag &= ~INP_IPV4;
392 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
393 inp->inp_vflag |= INP_IPV4;
394 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
395 }
396 if (error == 0) {
397 tp->t_state = TCPS_LISTEN;
398 solisten_proto(so, backlog);
399 }
400 SOCK_UNLOCK(so);
401
402 out:
403 TCPDEBUG2(PRU_LISTEN);
404 INP_WUNLOCK(inp);
405 INP_INFO_WUNLOCK(&V_tcbinfo);
406 return (error);
407 }
408 #endif /* INET6 */
409
410 /*
411 * Initiate connection to peer.
412 * Create a template for use in transmissions on this connection.
413 * Enter SYN_SENT state, and mark socket as connecting.
414 * Start keep-alive timer, and seed output sequence space.
415 * Send initial segment on connection.
416 */
417 static int
418 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
419 {
420 int error = 0;
421 struct inpcb *inp;
422 struct tcpcb *tp = NULL;
423 struct sockaddr_in *sinp;
424
425 sinp = (struct sockaddr_in *)nam;
426 if (nam->sa_len != sizeof (*sinp))
427 return (EINVAL);
428 /*
429 * Must disallow TCP ``connections'' to multicast addresses.
430 */
431 if (sinp->sin_family == AF_INET
432 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
433 return (EAFNOSUPPORT);
434 if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0)
435 return (error);
436
437 TCPDEBUG0;
438 INP_INFO_WLOCK(&V_tcbinfo);
439 inp = sotoinpcb(so);
440 KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL"));
441 INP_WLOCK(inp);
442 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
443 error = EINVAL;
444 goto out;
445 }
446 tp = intotcpcb(inp);
447 TCPDEBUG1();
448 if ((error = tcp_connect(tp, nam, td)) != 0)
449 goto out;
450 error = tcp_output_connect(so, nam);
451 out:
452 TCPDEBUG2(PRU_CONNECT);
453 INP_WUNLOCK(inp);
454 INP_INFO_WUNLOCK(&V_tcbinfo);
455 return (error);
456 }
457
458 #ifdef INET6
459 static int
460 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
461 {
462 int error = 0;
463 struct inpcb *inp;
464 struct tcpcb *tp = NULL;
465 struct sockaddr_in6 *sin6p;
466
467 TCPDEBUG0;
468
469 sin6p = (struct sockaddr_in6 *)nam;
470 if (nam->sa_len != sizeof (*sin6p))
471 return (EINVAL);
472 /*
473 * Must disallow TCP ``connections'' to multicast addresses.
474 */
475 if (sin6p->sin6_family == AF_INET6
476 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr))
477 return (EAFNOSUPPORT);
478
479 INP_INFO_WLOCK(&V_tcbinfo);
480 inp = sotoinpcb(so);
481 KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL"));
482 INP_WLOCK(inp);
483 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
484 error = EINVAL;
485 goto out;
486 }
487 tp = intotcpcb(inp);
488 TCPDEBUG1();
489 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
490 struct sockaddr_in sin;
491
492 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
493 error = EINVAL;
494 goto out;
495 }
496
497 in6_sin6_2_sin(&sin, sin6p);
498 inp->inp_vflag |= INP_IPV4;
499 inp->inp_vflag &= ~INP_IPV6;
500 if ((error = prison_remote_ip4(td->td_ucred,
501 &sin.sin_addr)) != 0)
502 goto out;
503 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0)
504 goto out;
505 error = tcp_output_connect(so, nam);
506 goto out;
507 }
508 inp->inp_vflag &= ~INP_IPV4;
509 inp->inp_vflag |= INP_IPV6;
510 inp->inp_inc.inc_flags |= INC_ISIPV6;
511 if ((error = prison_remote_ip6(td->td_ucred, &sin6p->sin6_addr)) != 0)
512 goto out;
513 if ((error = tcp6_connect(tp, nam, td)) != 0)
514 goto out;
515 error = tcp_output_connect(so, nam);
516
517 out:
518 TCPDEBUG2(PRU_CONNECT);
519 INP_WUNLOCK(inp);
520 INP_INFO_WUNLOCK(&V_tcbinfo);
521 return (error);
522 }
523 #endif /* INET6 */
524
525 /*
526 * Initiate disconnect from peer.
527 * If connection never passed embryonic stage, just drop;
528 * else if don't need to let data drain, then can just drop anyways,
529 * else have to begin TCP shutdown process: mark socket disconnecting,
530 * drain unread data, state switch to reflect user close, and
531 * send segment (e.g. FIN) to peer. Socket will be really disconnected
532 * when peer sends FIN and acks ours.
533 *
534 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
535 */
536 static int
537 tcp_usr_disconnect(struct socket *so)
538 {
539 struct inpcb *inp;
540 struct tcpcb *tp = NULL;
541 int error = 0;
542
543 TCPDEBUG0;
544 INP_INFO_WLOCK(&V_tcbinfo);
545 inp = sotoinpcb(so);
546 KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL"));
547 INP_WLOCK(inp);
548 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
549 error = ECONNRESET;
550 goto out;
551 }
552 tp = intotcpcb(inp);
553 TCPDEBUG1();
554 tcp_disconnect(tp);
555 out:
556 TCPDEBUG2(PRU_DISCONNECT);
557 INP_WUNLOCK(inp);
558 INP_INFO_WUNLOCK(&V_tcbinfo);
559 return (error);
560 }
561
562 /*
563 * Accept a connection. Essentially all the work is
564 * done at higher levels; just return the address
565 * of the peer, storing through addr.
566 */
567 static int
568 tcp_usr_accept(struct socket *so, struct sockaddr **nam)
569 {
570 int error = 0;
571 struct inpcb *inp = NULL;
572 struct tcpcb *tp = NULL;
573 struct in_addr addr;
574 in_port_t port = 0;
575 TCPDEBUG0;
576
577 if (so->so_state & SS_ISDISCONNECTED)
578 return (ECONNABORTED);
579
580 inp = sotoinpcb(so);
581 KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL"));
582 INP_INFO_RLOCK(&V_tcbinfo);
583 INP_WLOCK(inp);
584 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
585 error = ECONNABORTED;
586 goto out;
587 }
588 tp = intotcpcb(inp);
589 TCPDEBUG1();
590
591 /*
592 * We inline in_getpeeraddr and COMMON_END here, so that we can
593 * copy the data of interest and defer the malloc until after we
594 * release the lock.
595 */
596 port = inp->inp_fport;
597 addr = inp->inp_faddr;
598
599 out:
600 TCPDEBUG2(PRU_ACCEPT);
601 INP_WUNLOCK(inp);
602 INP_INFO_RUNLOCK(&V_tcbinfo);
603 if (error == 0)
604 *nam = in_sockaddr(port, &addr);
605 return error;
606 }
607
608 #ifdef INET6
609 static int
610 tcp6_usr_accept(struct socket *so, struct sockaddr **nam)
611 {
612 struct inpcb *inp = NULL;
613 int error = 0;
614 struct tcpcb *tp = NULL;
615 struct in_addr addr;
616 struct in6_addr addr6;
617 in_port_t port = 0;
618 int v4 = 0;
619 TCPDEBUG0;
620
621 if (so->so_state & SS_ISDISCONNECTED)
622 return (ECONNABORTED);
623
624 inp = sotoinpcb(so);
625 KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL"));
626 INP_WLOCK(inp);
627 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
628 error = ECONNABORTED;
629 goto out;
630 }
631 tp = intotcpcb(inp);
632 TCPDEBUG1();
633
634 /*
635 * We inline in6_mapped_peeraddr and COMMON_END here, so that we can
636 * copy the data of interest and defer the malloc until after we
637 * release the lock.
638 */
639 if (inp->inp_vflag & INP_IPV4) {
640 v4 = 1;
641 port = inp->inp_fport;
642 addr = inp->inp_faddr;
643 } else {
644 port = inp->inp_fport;
645 addr6 = inp->in6p_faddr;
646 }
647
648 out:
649 TCPDEBUG2(PRU_ACCEPT);
650 INP_WUNLOCK(inp);
651 if (error == 0) {
652 if (v4)
653 *nam = in6_v4mapsin6_sockaddr(port, &addr);
654 else
655 *nam = in6_sockaddr(port, &addr6);
656 }
657 return error;
658 }
659 #endif /* INET6 */
660
661 /*
662 * Mark the connection as being incapable of further output.
663 */
664 static int
665 tcp_usr_shutdown(struct socket *so)
666 {
667 int error = 0;
668 struct inpcb *inp;
669 struct tcpcb *tp = NULL;
670
671 TCPDEBUG0;
672 INP_INFO_WLOCK(&V_tcbinfo);
673 inp = sotoinpcb(so);
674 KASSERT(inp != NULL, ("inp == NULL"));
675 INP_WLOCK(inp);
676 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
677 error = ECONNRESET;
678 goto out;
679 }
680 tp = intotcpcb(inp);
681 TCPDEBUG1();
682 socantsendmore(so);
683 tcp_usrclosed(tp);
684 if (!(inp->inp_flags & INP_DROPPED))
685 error = tcp_output_disconnect(tp);
686
687 out:
688 TCPDEBUG2(PRU_SHUTDOWN);
689 INP_WUNLOCK(inp);
690 INP_INFO_WUNLOCK(&V_tcbinfo);
691
692 return (error);
693 }
694
695 /*
696 * After a receive, possibly send window update to peer.
697 */
698 static int
699 tcp_usr_rcvd(struct socket *so, int flags)
700 {
701 struct inpcb *inp;
702 struct tcpcb *tp = NULL;
703 int error = 0;
704
705 TCPDEBUG0;
706 inp = sotoinpcb(so);
707 KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL"));
708 INP_WLOCK(inp);
709 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
710 error = ECONNRESET;
711 goto out;
712 }
713 tp = intotcpcb(inp);
714 TCPDEBUG1();
715 tcp_output_rcvd(tp);
716
717 out:
718 TCPDEBUG2(PRU_RCVD);
719 INP_WUNLOCK(inp);
720 return (error);
721 }
722
723 /*
724 * Do a send by putting data in output queue and updating urgent
725 * marker if URG set. Possibly send more data. Unlike the other
726 * pru_*() routines, the mbuf chains are our responsibility. We
727 * must either enqueue them or free them. The other pru_* routines
728 * generally are caller-frees.
729 */
730 static int
731 tcp_usr_send(struct socket *so, int flags, struct mbuf *m,
732 struct sockaddr *nam, struct mbuf *control, struct thread *td)
733 {
734 int error = 0;
735 struct inpcb *inp;
736 struct tcpcb *tp = NULL;
737 int headlocked = 0;
738 #ifdef INET6
739 int isipv6;
740 #endif
741 TCPDEBUG0;
742
743 /*
744 * We require the pcbinfo lock in two cases:
745 *
746 * (1) An implied connect is taking place, which can result in
747 * binding IPs and ports and hence modification of the pcb hash
748 * chains.
749 *
750 * (2) PRUS_EOF is set, resulting in explicit close on the send.
751 */
752 if ((nam != NULL) || (flags & PRUS_EOF)) {
753 INP_INFO_WLOCK(&V_tcbinfo);
754 headlocked = 1;
755 }
756 inp = sotoinpcb(so);
757 KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL"));
758 INP_WLOCK(inp);
759 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
760 if (control)
761 m_freem(control);
762 if (m)
763 m_freem(m);
764 error = ECONNRESET;
765 goto out;
766 }
767 #ifdef INET6
768 isipv6 = nam && nam->sa_family == AF_INET6;
769 #endif /* INET6 */
770 tp = intotcpcb(inp);
771 TCPDEBUG1();
772 if (control) {
773 /* TCP doesn't do control messages (rights, creds, etc) */
774 if (control->m_len) {
775 m_freem(control);
776 if (m)
777 m_freem(m);
778 error = EINVAL;
779 goto out;
780 }
781 m_freem(control); /* empty control, just free it */
782 }
783 if (!(flags & PRUS_OOB)) {
784 sbappendstream(&so->so_snd, m);
785 if (nam && tp->t_state < TCPS_SYN_SENT) {
786 /*
787 * Do implied connect if not yet connected,
788 * initialize window to default value, and
789 * initialize maxseg/maxopd using peer's cached
790 * MSS.
791 */
792 INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
793 #ifdef INET6
794 if (isipv6)
795 error = tcp6_connect(tp, nam, td);
796 else
797 #endif /* INET6 */
798 error = tcp_connect(tp, nam, td);
799 if (error)
800 goto out;
801 tp->snd_wnd = TTCP_CLIENT_SND_WND;
802 tcp_mss(tp, -1);
803 }
804 if (flags & PRUS_EOF) {
805 /*
806 * Close the send side of the connection after
807 * the data is sent.
808 */
809 INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
810 socantsendmore(so);
811 tcp_usrclosed(tp);
812 }
813 if (headlocked) {
814 INP_INFO_WUNLOCK(&V_tcbinfo);
815 headlocked = 0;
816 }
817 if (!(inp->inp_flags & INP_DROPPED)) {
818 if (flags & PRUS_MORETOCOME)
819 tp->t_flags |= TF_MORETOCOME;
820 error = tcp_output_send(tp);
821 if (flags & PRUS_MORETOCOME)
822 tp->t_flags &= ~TF_MORETOCOME;
823 }
824 } else {
825 /*
826 * XXXRW: PRUS_EOF not implemented with PRUS_OOB?
827 */
828 SOCKBUF_LOCK(&so->so_snd);
829 if (sbspace(&so->so_snd) < -512) {
830 SOCKBUF_UNLOCK(&so->so_snd);
831 m_freem(m);
832 error = ENOBUFS;
833 goto out;
834 }
835 /*
836 * According to RFC961 (Assigned Protocols),
837 * the urgent pointer points to the last octet
838 * of urgent data. We continue, however,
839 * to consider it to indicate the first octet
840 * of data past the urgent section.
841 * Otherwise, snd_up should be one lower.
842 */
843 sbappendstream_locked(&so->so_snd, m);
844 SOCKBUF_UNLOCK(&so->so_snd);
845 if (nam && tp->t_state < TCPS_SYN_SENT) {
846 /*
847 * Do implied connect if not yet connected,
848 * initialize window to default value, and
849 * initialize maxseg/maxopd using peer's cached
850 * MSS.
851 */
852 INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
853 #ifdef INET6
854 if (isipv6)
855 error = tcp6_connect(tp, nam, td);
856 else
857 #endif /* INET6 */
858 error = tcp_connect(tp, nam, td);
859 if (error)
860 goto out;
861 tp->snd_wnd = TTCP_CLIENT_SND_WND;
862 tcp_mss(tp, -1);
863 INP_INFO_WUNLOCK(&V_tcbinfo);
864 headlocked = 0;
865 } else if (nam) {
866 INP_INFO_WUNLOCK(&V_tcbinfo);
867 headlocked = 0;
868 }
869 tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
870 tp->t_flags |= TF_FORCEDATA;
871 error = tcp_output_send(tp);
872 tp->t_flags &= ~TF_FORCEDATA;
873 }
874 out:
875 TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB :
876 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
877 INP_WUNLOCK(inp);
878 if (headlocked)
879 INP_INFO_WUNLOCK(&V_tcbinfo);
880 return (error);
881 }
882
883 /*
884 * Abort the TCP. Drop the connection abruptly.
885 */
886 static void
887 tcp_usr_abort(struct socket *so)
888 {
889 struct inpcb *inp;
890 struct tcpcb *tp = NULL;
891 TCPDEBUG0;
892
893 inp = sotoinpcb(so);
894 KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL"));
895
896 INP_INFO_WLOCK(&V_tcbinfo);
897 INP_WLOCK(inp);
898 KASSERT(inp->inp_socket != NULL,
899 ("tcp_usr_abort: inp_socket == NULL"));
900
901 /*
902 * If we still have full TCP state, and we're not dropped, drop.
903 */
904 if (!(inp->inp_flags & INP_TIMEWAIT) &&
905 !(inp->inp_flags & INP_DROPPED)) {
906 tp = intotcpcb(inp);
907 TCPDEBUG1();
908 tcp_drop(tp, ECONNABORTED);
909 TCPDEBUG2(PRU_ABORT);
910 }
911 if (!(inp->inp_flags & INP_DROPPED)) {
912 SOCK_LOCK(so);
913 so->so_state |= SS_PROTOREF;
914 SOCK_UNLOCK(so);
915 inp->inp_flags |= INP_SOCKREF;
916 }
917 INP_WUNLOCK(inp);
918 INP_INFO_WUNLOCK(&V_tcbinfo);
919 }
920
921 /*
922 * TCP socket is closed. Start friendly disconnect.
923 */
924 static void
925 tcp_usr_close(struct socket *so)
926 {
927 struct inpcb *inp;
928 struct tcpcb *tp = NULL;
929 TCPDEBUG0;
930
931 inp = sotoinpcb(so);
932 KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL"));
933
934 INP_INFO_WLOCK(&V_tcbinfo);
935 INP_WLOCK(inp);
936 KASSERT(inp->inp_socket != NULL,
937 ("tcp_usr_close: inp_socket == NULL"));
938
939 /*
940 * If we still have full TCP state, and we're not dropped, initiate
941 * a disconnect.
942 */
943 if (!(inp->inp_flags & INP_TIMEWAIT) &&
944 !(inp->inp_flags & INP_DROPPED)) {
945 tp = intotcpcb(inp);
946 TCPDEBUG1();
947 tcp_disconnect(tp);
948 TCPDEBUG2(PRU_CLOSE);
949 }
950 if (!(inp->inp_flags & INP_DROPPED)) {
951 SOCK_LOCK(so);
952 so->so_state |= SS_PROTOREF;
953 SOCK_UNLOCK(so);
954 inp->inp_flags |= INP_SOCKREF;
955 }
956 INP_WUNLOCK(inp);
957 INP_INFO_WUNLOCK(&V_tcbinfo);
958 }
959
960 /*
961 * Receive out-of-band data.
962 */
963 static int
964 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags)
965 {
966 int error = 0;
967 struct inpcb *inp;
968 struct tcpcb *tp = NULL;
969
970 TCPDEBUG0;
971 inp = sotoinpcb(so);
972 KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL"));
973 INP_WLOCK(inp);
974 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
975 error = ECONNRESET;
976 goto out;
977 }
978 tp = intotcpcb(inp);
979 TCPDEBUG1();
980 if ((so->so_oobmark == 0 &&
981 (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) ||
982 so->so_options & SO_OOBINLINE ||
983 tp->t_oobflags & TCPOOB_HADDATA) {
984 error = EINVAL;
985 goto out;
986 }
987 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
988 error = EWOULDBLOCK;
989 goto out;
990 }
991 m->m_len = 1;
992 *mtod(m, caddr_t) = tp->t_iobc;
993 if ((flags & MSG_PEEK) == 0)
994 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
995
996 out:
997 TCPDEBUG2(PRU_RCVOOB);
998 INP_WUNLOCK(inp);
999 return (error);
1000 }
1001
1002 struct pr_usrreqs tcp_usrreqs = {
1003 .pru_abort = tcp_usr_abort,
1004 .pru_accept = tcp_usr_accept,
1005 .pru_attach = tcp_usr_attach,
1006 .pru_bind = tcp_usr_bind,
1007 .pru_connect = tcp_usr_connect,
1008 .pru_control = in_control,
1009 .pru_detach = tcp_usr_detach,
1010 .pru_disconnect = tcp_usr_disconnect,
1011 .pru_listen = tcp_usr_listen,
1012 .pru_peeraddr = in_getpeeraddr,
1013 .pru_rcvd = tcp_usr_rcvd,
1014 .pru_rcvoob = tcp_usr_rcvoob,
1015 .pru_send = tcp_usr_send,
1016 .pru_shutdown = tcp_usr_shutdown,
1017 .pru_sockaddr = in_getsockaddr,
1018 #if 0
1019 .pru_soreceive = soreceive_stream,
1020 #endif
1021 .pru_sosetlabel = in_pcbsosetlabel,
1022 .pru_close = tcp_usr_close,
1023 };
1024
1025 #ifdef INET6
1026 struct pr_usrreqs tcp6_usrreqs = {
1027 .pru_abort = tcp_usr_abort,
1028 .pru_accept = tcp6_usr_accept,
1029 .pru_attach = tcp_usr_attach,
1030 .pru_bind = tcp6_usr_bind,
1031 .pru_connect = tcp6_usr_connect,
1032 .pru_control = in6_control,
1033 .pru_detach = tcp_usr_detach,
1034 .pru_disconnect = tcp_usr_disconnect,
1035 .pru_listen = tcp6_usr_listen,
1036 .pru_peeraddr = in6_mapped_peeraddr,
1037 .pru_rcvd = tcp_usr_rcvd,
1038 .pru_rcvoob = tcp_usr_rcvoob,
1039 .pru_send = tcp_usr_send,
1040 .pru_shutdown = tcp_usr_shutdown,
1041 .pru_sockaddr = in6_mapped_sockaddr,
1042 #if 0
1043 .pru_soreceive = soreceive_stream,
1044 #endif
1045 .pru_sosetlabel = in_pcbsosetlabel,
1046 .pru_close = tcp_usr_close,
1047 };
1048 #endif /* INET6 */
1049
1050 /*
1051 * Common subroutine to open a TCP connection to remote host specified
1052 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local
1053 * port number if needed. Call in_pcbconnect_setup to do the routing and
1054 * to choose a local host address (interface). If there is an existing
1055 * incarnation of the same connection in TIME-WAIT state and if the remote
1056 * host was sending CC options and if the connection duration was < MSL, then
1057 * truncate the previous TIME-WAIT state and proceed.
1058 * Initialize connection parameters and enter SYN-SENT state.
1059 */
1060 static int
1061 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1062 {
1063 struct inpcb *inp = tp->t_inpcb, *oinp;
1064 struct socket *so = inp->inp_socket;
1065 struct in_addr laddr;
1066 u_short lport;
1067 int error;
1068
1069 INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
1070 INP_WLOCK_ASSERT(inp);
1071
1072 if (inp->inp_lport == 0) {
1073 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1074 if (error)
1075 return error;
1076 }
1077
1078 /*
1079 * Cannot simply call in_pcbconnect, because there might be an
1080 * earlier incarnation of this same connection still in
1081 * TIME_WAIT state, creating an ADDRINUSE error.
1082 */
1083 laddr = inp->inp_laddr;
1084 lport = inp->inp_lport;
1085 error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport,
1086 &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred);
1087 if (error && oinp == NULL)
1088 return error;
1089 if (oinp)
1090 return EADDRINUSE;
1091 inp->inp_laddr = laddr;
1092 in_pcbrehash(inp);
1093
1094 /*
1095 * Compute window scaling to request:
1096 * Scale to fit into sweet spot. See tcp_syncache.c.
1097 * XXX: This should move to tcp_output().
1098 */
1099 while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1100 (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1101 tp->request_r_scale++;
1102
1103 soisconnecting(so);
1104 TCPSTAT_INC(tcps_connattempt);
1105 tp->t_state = TCPS_SYN_SENT;
1106 tcp_timer_activate(tp, TT_KEEP, tcp_keepinit);
1107 tp->iss = tcp_new_isn(tp);
1108 tp->t_bw_rtseq = tp->iss;
1109 tcp_sendseqinit(tp);
1110
1111 return 0;
1112 }
1113
1114 #ifdef INET6
1115 static int
1116 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1117 {
1118 struct inpcb *inp = tp->t_inpcb, *oinp;
1119 struct socket *so = inp->inp_socket;
1120 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
1121 struct in6_addr addr6;
1122 int error;
1123
1124 INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
1125 INP_WLOCK_ASSERT(inp);
1126
1127 if (inp->inp_lport == 0) {
1128 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1129 if (error)
1130 return error;
1131 }
1132
1133 /*
1134 * Cannot simply call in_pcbconnect, because there might be an
1135 * earlier incarnation of this same connection still in
1136 * TIME_WAIT state, creating an ADDRINUSE error.
1137 * in6_pcbladdr() also handles scope zone IDs.
1138 */
1139 error = in6_pcbladdr(inp, nam, &addr6);
1140 if (error)
1141 return error;
1142 oinp = in6_pcblookup_hash(inp->inp_pcbinfo,
1143 &sin6->sin6_addr, sin6->sin6_port,
1144 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
1145 ? &addr6
1146 : &inp->in6p_laddr,
1147 inp->inp_lport, 0, NULL);
1148 if (oinp)
1149 return EADDRINUSE;
1150 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
1151 inp->in6p_laddr = addr6;
1152 inp->in6p_faddr = sin6->sin6_addr;
1153 inp->inp_fport = sin6->sin6_port;
1154 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
1155 inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
1156 if (inp->inp_flags & IN6P_AUTOFLOWLABEL)
1157 inp->inp_flow |=
1158 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
1159 in_pcbrehash(inp);
1160
1161 /* Compute window scaling to request. */
1162 while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1163 (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1164 tp->request_r_scale++;
1165
1166 soisconnecting(so);
1167 TCPSTAT_INC(tcps_connattempt);
1168 tp->t_state = TCPS_SYN_SENT;
1169 tcp_timer_activate(tp, TT_KEEP, tcp_keepinit);
1170 tp->iss = tcp_new_isn(tp);
1171 tp->t_bw_rtseq = tp->iss;
1172 tcp_sendseqinit(tp);
1173
1174 return 0;
1175 }
1176 #endif /* INET6 */
1177
1178 /*
1179 * Export TCP internal state information via a struct tcp_info, based on the
1180 * Linux 2.6 API. Not ABI compatible as our constants are mapped differently
1181 * (TCP state machine, etc). We export all information using FreeBSD-native
1182 * constants -- for example, the numeric values for tcpi_state will differ
1183 * from Linux.
1184 */
1185 static void
1186 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti)
1187 {
1188
1189 INP_WLOCK_ASSERT(tp->t_inpcb);
1190 bzero(ti, sizeof(*ti));
1191
1192 ti->tcpi_state = tp->t_state;
1193 if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP))
1194 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS;
1195 if (tp->t_flags & TF_SACK_PERMIT)
1196 ti->tcpi_options |= TCPI_OPT_SACK;
1197 if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) {
1198 ti->tcpi_options |= TCPI_OPT_WSCALE;
1199 ti->tcpi_snd_wscale = tp->snd_scale;
1200 ti->tcpi_rcv_wscale = tp->rcv_scale;
1201 }
1202
1203 ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT;
1204 ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT;
1205
1206 ti->tcpi_snd_ssthresh = tp->snd_ssthresh;
1207 ti->tcpi_snd_cwnd = tp->snd_cwnd;
1208
1209 /*
1210 * FreeBSD-specific extension fields for tcp_info.
1211 */
1212 ti->tcpi_rcv_space = tp->rcv_wnd;
1213 ti->tcpi_rcv_nxt = tp->rcv_nxt;
1214 ti->tcpi_snd_wnd = tp->snd_wnd;
1215 ti->tcpi_snd_bwnd = tp->snd_bwnd;
1216 ti->tcpi_snd_nxt = tp->snd_nxt;
1217 ti->__tcpi_snd_mss = tp->t_maxseg;
1218 ti->__tcpi_rcv_mss = tp->t_maxseg;
1219 if (tp->t_flags & TF_TOE)
1220 ti->tcpi_options |= TCPI_OPT_TOE;
1221 }
1222
1223 /*
1224 * tcp_ctloutput() must drop the inpcb lock before performing copyin on
1225 * socket option arguments. When it re-acquires the lock after the copy, it
1226 * has to revalidate that the connection is still valid for the socket
1227 * option.
1228 */
1229 #define INP_WLOCK_RECHECK(inp) do { \
1230 INP_WLOCK(inp); \
1231 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { \
1232 INP_WUNLOCK(inp); \
1233 return (ECONNRESET); \
1234 } \
1235 tp = intotcpcb(inp); \
1236 } while(0)
1237
1238 int
1239 tcp_ctloutput(struct socket *so, struct sockopt *sopt)
1240 {
1241 int error, opt, optval;
1242 struct inpcb *inp;
1243 struct tcpcb *tp;
1244 struct tcp_info ti;
1245
1246 error = 0;
1247 inp = sotoinpcb(so);
1248 KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL"));
1249 INP_WLOCK(inp);
1250 if (sopt->sopt_level != IPPROTO_TCP) {
1251 #ifdef INET6
1252 if (inp->inp_vflag & INP_IPV6PROTO) {
1253 INP_WUNLOCK(inp);
1254 error = ip6_ctloutput(so, sopt);
1255 } else {
1256 #endif /* INET6 */
1257 INP_WUNLOCK(inp);
1258 error = ip_ctloutput(so, sopt);
1259 #ifdef INET6
1260 }
1261 #endif
1262 return (error);
1263 }
1264 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1265 INP_WUNLOCK(inp);
1266 return (ECONNRESET);
1267 }
1268
1269 switch (sopt->sopt_dir) {
1270 case SOPT_SET:
1271 switch (sopt->sopt_name) {
1272 #ifdef TCP_SIGNATURE
1273 case TCP_MD5SIG:
1274 INP_WUNLOCK(inp);
1275 error = sooptcopyin(sopt, &optval, sizeof optval,
1276 sizeof optval);
1277 if (error)
1278 return (error);
1279
1280 INP_WLOCK_RECHECK(inp);
1281 if (optval > 0)
1282 tp->t_flags |= TF_SIGNATURE;
1283 else
1284 tp->t_flags &= ~TF_SIGNATURE;
1285 INP_WUNLOCK(inp);
1286 break;
1287 #endif /* TCP_SIGNATURE */
1288 case TCP_NODELAY:
1289 case TCP_NOOPT:
1290 INP_WUNLOCK(inp);
1291 error = sooptcopyin(sopt, &optval, sizeof optval,
1292 sizeof optval);
1293 if (error)
1294 return (error);
1295
1296 INP_WLOCK_RECHECK(inp);
1297 switch (sopt->sopt_name) {
1298 case TCP_NODELAY:
1299 opt = TF_NODELAY;
1300 break;
1301 case TCP_NOOPT:
1302 opt = TF_NOOPT;
1303 break;
1304 default:
1305 opt = 0; /* dead code to fool gcc */
1306 break;
1307 }
1308
1309 if (optval)
1310 tp->t_flags |= opt;
1311 else
1312 tp->t_flags &= ~opt;
1313 INP_WUNLOCK(inp);
1314 break;
1315
1316 case TCP_NOPUSH:
1317 INP_WUNLOCK(inp);
1318 error = sooptcopyin(sopt, &optval, sizeof optval,
1319 sizeof optval);
1320 if (error)
1321 return (error);
1322
1323 INP_WLOCK_RECHECK(inp);
1324 if (optval)
1325 tp->t_flags |= TF_NOPUSH;
1326 else {
1327 tp->t_flags &= ~TF_NOPUSH;
1328 error = tcp_output(tp);
1329 }
1330 INP_WUNLOCK(inp);
1331 break;
1332
1333 case TCP_MAXSEG:
1334 INP_WUNLOCK(inp);
1335 error = sooptcopyin(sopt, &optval, sizeof optval,
1336 sizeof optval);
1337 if (error)
1338 return (error);
1339
1340 INP_WLOCK_RECHECK(inp);
1341 if (optval > 0 && optval <= tp->t_maxseg &&
1342 optval + 40 >= V_tcp_minmss)
1343 tp->t_maxseg = optval;
1344 else
1345 error = EINVAL;
1346 INP_WUNLOCK(inp);
1347 break;
1348
1349 case TCP_INFO:
1350 INP_WUNLOCK(inp);
1351 error = EINVAL;
1352 break;
1353
1354 default:
1355 INP_WUNLOCK(inp);
1356 error = ENOPROTOOPT;
1357 break;
1358 }
1359 break;
1360
1361 case SOPT_GET:
1362 tp = intotcpcb(inp);
1363 switch (sopt->sopt_name) {
1364 #ifdef TCP_SIGNATURE
1365 case TCP_MD5SIG:
1366 optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0;
1367 INP_WUNLOCK(inp);
1368 error = sooptcopyout(sopt, &optval, sizeof optval);
1369 break;
1370 #endif
1371
1372 case TCP_NODELAY:
1373 optval = tp->t_flags & TF_NODELAY;
1374 INP_WUNLOCK(inp);
1375 error = sooptcopyout(sopt, &optval, sizeof optval);
1376 break;
1377 case TCP_MAXSEG:
1378 optval = tp->t_maxseg;
1379 INP_WUNLOCK(inp);
1380 error = sooptcopyout(sopt, &optval, sizeof optval);
1381 break;
1382 case TCP_NOOPT:
1383 optval = tp->t_flags & TF_NOOPT;
1384 INP_WUNLOCK(inp);
1385 error = sooptcopyout(sopt, &optval, sizeof optval);
1386 break;
1387 case TCP_NOPUSH:
1388 optval = tp->t_flags & TF_NOPUSH;
1389 INP_WUNLOCK(inp);
1390 error = sooptcopyout(sopt, &optval, sizeof optval);
1391 break;
1392 case TCP_INFO:
1393 tcp_fill_info(tp, &ti);
1394 INP_WUNLOCK(inp);
1395 error = sooptcopyout(sopt, &ti, sizeof ti);
1396 break;
1397 default:
1398 INP_WUNLOCK(inp);
1399 error = ENOPROTOOPT;
1400 break;
1401 }
1402 break;
1403 }
1404 return (error);
1405 }
1406 #undef INP_WLOCK_RECHECK
1407
1408 /*
1409 * tcp_sendspace and tcp_recvspace are the default send and receive window
1410 * sizes, respectively. These are obsolescent (this information should
1411 * be set by the route).
1412 */
1413 u_long tcp_sendspace = 1024*32;
1414 SYSCTL_ULONG(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW,
1415 &tcp_sendspace , 0, "Maximum outgoing TCP datagram size");
1416 u_long tcp_recvspace = 1024*64;
1417 SYSCTL_ULONG(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
1418 &tcp_recvspace , 0, "Maximum incoming TCP datagram size");
1419
1420 /*
1421 * Attach TCP protocol to socket, allocating
1422 * internet protocol control block, tcp control block,
1423 * bufer space, and entering LISTEN state if to accept connections.
1424 */
1425 static int
1426 tcp_attach(struct socket *so)
1427 {
1428 struct tcpcb *tp;
1429 struct inpcb *inp;
1430 int error;
1431
1432 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1433 error = soreserve(so, tcp_sendspace, tcp_recvspace);
1434 if (error)
1435 return (error);
1436 }
1437 so->so_rcv.sb_flags |= SB_AUTOSIZE;
1438 so->so_snd.sb_flags |= SB_AUTOSIZE;
1439 INP_INFO_WLOCK(&V_tcbinfo);
1440 error = in_pcballoc(so, &V_tcbinfo);
1441 if (error) {
1442 INP_INFO_WUNLOCK(&V_tcbinfo);
1443 return (error);
1444 }
1445 inp = sotoinpcb(so);
1446 #ifdef INET6
1447 if (inp->inp_vflag & INP_IPV6PROTO) {
1448 inp->inp_vflag |= INP_IPV6;
1449 inp->in6p_hops = -1; /* use kernel default */
1450 }
1451 else
1452 #endif
1453 inp->inp_vflag |= INP_IPV4;
1454 tp = tcp_newtcpcb(inp);
1455 if (tp == NULL) {
1456 in_pcbdetach(inp);
1457 in_pcbfree(inp);
1458 INP_INFO_WUNLOCK(&V_tcbinfo);
1459 return (ENOBUFS);
1460 }
1461 tp->t_state = TCPS_CLOSED;
1462 INP_WUNLOCK(inp);
1463 INP_INFO_WUNLOCK(&V_tcbinfo);
1464 return (0);
1465 }
1466
1467 /*
1468 * Initiate (or continue) disconnect.
1469 * If embryonic state, just send reset (once).
1470 * If in ``let data drain'' option and linger null, just drop.
1471 * Otherwise (hard), mark socket disconnecting and drop
1472 * current input data; switch states based on user close, and
1473 * send segment to peer (with FIN).
1474 */
1475 static void
1476 tcp_disconnect(struct tcpcb *tp)
1477 {
1478 struct inpcb *inp = tp->t_inpcb;
1479 struct socket *so = inp->inp_socket;
1480
1481 INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
1482 INP_WLOCK_ASSERT(inp);
1483
1484 /*
1485 * Neither tcp_close() nor tcp_drop() should return NULL, as the
1486 * socket is still open.
1487 */
1488 if (tp->t_state < TCPS_ESTABLISHED) {
1489 tp = tcp_close(tp);
1490 KASSERT(tp != NULL,
1491 ("tcp_disconnect: tcp_close() returned NULL"));
1492 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
1493 tp = tcp_drop(tp, 0);
1494 KASSERT(tp != NULL,
1495 ("tcp_disconnect: tcp_drop() returned NULL"));
1496 } else {
1497 soisdisconnecting(so);
1498 sbflush(&so->so_rcv);
1499 tcp_usrclosed(tp);
1500 if (!(inp->inp_flags & INP_DROPPED))
1501 tcp_output_disconnect(tp);
1502 }
1503 }
1504
1505 /*
1506 * User issued close, and wish to trail through shutdown states:
1507 * if never received SYN, just forget it. If got a SYN from peer,
1508 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
1509 * If already got a FIN from peer, then almost done; go to LAST_ACK
1510 * state. In all other cases, have already sent FIN to peer (e.g.
1511 * after PRU_SHUTDOWN), and just have to play tedious game waiting
1512 * for peer to send FIN or not respond to keep-alives, etc.
1513 * We can let the user exit from the close as soon as the FIN is acked.
1514 */
1515 static void
1516 tcp_usrclosed(struct tcpcb *tp)
1517 {
1518
1519 INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
1520 INP_WLOCK_ASSERT(tp->t_inpcb);
1521
1522 switch (tp->t_state) {
1523 case TCPS_LISTEN:
1524 tcp_offload_listen_close(tp);
1525 /* FALLTHROUGH */
1526 case TCPS_CLOSED:
1527 tp->t_state = TCPS_CLOSED;
1528 tp = tcp_close(tp);
1529 /*
1530 * tcp_close() should never return NULL here as the socket is
1531 * still open.
1532 */
1533 KASSERT(tp != NULL,
1534 ("tcp_usrclosed: tcp_close() returned NULL"));
1535 break;
1536
1537 case TCPS_SYN_SENT:
1538 case TCPS_SYN_RECEIVED:
1539 tp->t_flags |= TF_NEEDFIN;
1540 break;
1541
1542 case TCPS_ESTABLISHED:
1543 tp->t_state = TCPS_FIN_WAIT_1;
1544 break;
1545
1546 case TCPS_CLOSE_WAIT:
1547 tp->t_state = TCPS_LAST_ACK;
1548 break;
1549 }
1550 if (tp->t_state >= TCPS_FIN_WAIT_2) {
1551 soisdisconnected(tp->t_inpcb->inp_socket);
1552 /* Prevent the connection hanging in FIN_WAIT_2 forever. */
1553 if (tp->t_state == TCPS_FIN_WAIT_2) {
1554 int timeout;
1555
1556 timeout = (tcp_fast_finwait2_recycle) ?
1557 tcp_finwait2_timeout : tcp_maxidle;
1558 tcp_timer_activate(tp, TT_2MSL, timeout);
1559 }
1560 }
1561 }
1562
1563 #ifdef DDB
1564 static void
1565 db_print_indent(int indent)
1566 {
1567 int i;
1568
1569 for (i = 0; i < indent; i++)
1570 db_printf(" ");
1571 }
1572
1573 static void
1574 db_print_tstate(int t_state)
1575 {
1576
1577 switch (t_state) {
1578 case TCPS_CLOSED:
1579 db_printf("TCPS_CLOSED");
1580 return;
1581
1582 case TCPS_LISTEN:
1583 db_printf("TCPS_LISTEN");
1584 return;
1585
1586 case TCPS_SYN_SENT:
1587 db_printf("TCPS_SYN_SENT");
1588 return;
1589
1590 case TCPS_SYN_RECEIVED:
1591 db_printf("TCPS_SYN_RECEIVED");
1592 return;
1593
1594 case TCPS_ESTABLISHED:
1595 db_printf("TCPS_ESTABLISHED");
1596 return;
1597
1598 case TCPS_CLOSE_WAIT:
1599 db_printf("TCPS_CLOSE_WAIT");
1600 return;
1601
1602 case TCPS_FIN_WAIT_1:
1603 db_printf("TCPS_FIN_WAIT_1");
1604 return;
1605
1606 case TCPS_CLOSING:
1607 db_printf("TCPS_CLOSING");
1608 return;
1609
1610 case TCPS_LAST_ACK:
1611 db_printf("TCPS_LAST_ACK");
1612 return;
1613
1614 case TCPS_FIN_WAIT_2:
1615 db_printf("TCPS_FIN_WAIT_2");
1616 return;
1617
1618 case TCPS_TIME_WAIT:
1619 db_printf("TCPS_TIME_WAIT");
1620 return;
1621
1622 default:
1623 db_printf("unknown");
1624 return;
1625 }
1626 }
1627
1628 static void
1629 db_print_tflags(u_int t_flags)
1630 {
1631 int comma;
1632
1633 comma = 0;
1634 if (t_flags & TF_ACKNOW) {
1635 db_printf("%sTF_ACKNOW", comma ? ", " : "");
1636 comma = 1;
1637 }
1638 if (t_flags & TF_DELACK) {
1639 db_printf("%sTF_DELACK", comma ? ", " : "");
1640 comma = 1;
1641 }
1642 if (t_flags & TF_NODELAY) {
1643 db_printf("%sTF_NODELAY", comma ? ", " : "");
1644 comma = 1;
1645 }
1646 if (t_flags & TF_NOOPT) {
1647 db_printf("%sTF_NOOPT", comma ? ", " : "");
1648 comma = 1;
1649 }
1650 if (t_flags & TF_SENTFIN) {
1651 db_printf("%sTF_SENTFIN", comma ? ", " : "");
1652 comma = 1;
1653 }
1654 if (t_flags & TF_REQ_SCALE) {
1655 db_printf("%sTF_REQ_SCALE", comma ? ", " : "");
1656 comma = 1;
1657 }
1658 if (t_flags & TF_RCVD_SCALE) {
1659 db_printf("%sTF_RECVD_SCALE", comma ? ", " : "");
1660 comma = 1;
1661 }
1662 if (t_flags & TF_REQ_TSTMP) {
1663 db_printf("%sTF_REQ_TSTMP", comma ? ", " : "");
1664 comma = 1;
1665 }
1666 if (t_flags & TF_RCVD_TSTMP) {
1667 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : "");
1668 comma = 1;
1669 }
1670 if (t_flags & TF_SACK_PERMIT) {
1671 db_printf("%sTF_SACK_PERMIT", comma ? ", " : "");
1672 comma = 1;
1673 }
1674 if (t_flags & TF_NEEDSYN) {
1675 db_printf("%sTF_NEEDSYN", comma ? ", " : "");
1676 comma = 1;
1677 }
1678 if (t_flags & TF_NEEDFIN) {
1679 db_printf("%sTF_NEEDFIN", comma ? ", " : "");
1680 comma = 1;
1681 }
1682 if (t_flags & TF_NOPUSH) {
1683 db_printf("%sTF_NOPUSH", comma ? ", " : "");
1684 comma = 1;
1685 }
1686 if (t_flags & TF_NOPUSH) {
1687 db_printf("%sTF_NOPUSH", comma ? ", " : "");
1688 comma = 1;
1689 }
1690 if (t_flags & TF_MORETOCOME) {
1691 db_printf("%sTF_MORETOCOME", comma ? ", " : "");
1692 comma = 1;
1693 }
1694 if (t_flags & TF_LQ_OVERFLOW) {
1695 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : "");
1696 comma = 1;
1697 }
1698 if (t_flags & TF_LASTIDLE) {
1699 db_printf("%sTF_LASTIDLE", comma ? ", " : "");
1700 comma = 1;
1701 }
1702 if (t_flags & TF_RXWIN0SENT) {
1703 db_printf("%sTF_RXWIN0SENT", comma ? ", " : "");
1704 comma = 1;
1705 }
1706 if (t_flags & TF_FASTRECOVERY) {
1707 db_printf("%sTF_FASTRECOVERY", comma ? ", " : "");
1708 comma = 1;
1709 }
1710 if (t_flags & TF_WASFRECOVERY) {
1711 db_printf("%sTF_WASFRECOVERY", comma ? ", " : "");
1712 comma = 1;
1713 }
1714 if (t_flags & TF_SIGNATURE) {
1715 db_printf("%sTF_SIGNATURE", comma ? ", " : "");
1716 comma = 1;
1717 }
1718 if (t_flags & TF_FORCEDATA) {
1719 db_printf("%sTF_FORCEDATA", comma ? ", " : "");
1720 comma = 1;
1721 }
1722 if (t_flags & TF_TSO) {
1723 db_printf("%sTF_TSO", comma ? ", " : "");
1724 comma = 1;
1725 }
1726 if (t_flags & TF_ECN_PERMIT) {
1727 db_printf("%sTF_ECN_PERMIT", comma ? ", " : "");
1728 comma = 1;
1729 }
1730 }
1731
1732 static void
1733 db_print_toobflags(char t_oobflags)
1734 {
1735 int comma;
1736
1737 comma = 0;
1738 if (t_oobflags & TCPOOB_HAVEDATA) {
1739 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : "");
1740 comma = 1;
1741 }
1742 if (t_oobflags & TCPOOB_HADDATA) {
1743 db_printf("%sTCPOOB_HADDATA", comma ? ", " : "");
1744 comma = 1;
1745 }
1746 }
1747
1748 static void
1749 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent)
1750 {
1751
1752 db_print_indent(indent);
1753 db_printf("%s at %p\n", name, tp);
1754
1755 indent += 2;
1756
1757 db_print_indent(indent);
1758 db_printf("t_segq first: %p t_segqlen: %d t_dupacks: %d\n",
1759 LIST_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks);
1760
1761 db_print_indent(indent);
1762 db_printf("tt_rexmt: %p tt_persist: %p tt_keep: %p\n",
1763 &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep);
1764
1765 db_print_indent(indent);
1766 db_printf("tt_2msl: %p tt_delack: %p t_inpcb: %p\n", &tp->t_timers->tt_2msl,
1767 &tp->t_timers->tt_delack, tp->t_inpcb);
1768
1769 db_print_indent(indent);
1770 db_printf("t_state: %d (", tp->t_state);
1771 db_print_tstate(tp->t_state);
1772 db_printf(")\n");
1773
1774 db_print_indent(indent);
1775 db_printf("t_flags: 0x%x (", tp->t_flags);
1776 db_print_tflags(tp->t_flags);
1777 db_printf(")\n");
1778
1779 db_print_indent(indent);
1780 db_printf("snd_una: 0x%08x snd_max: 0x%08x snd_nxt: x0%08x\n",
1781 tp->snd_una, tp->snd_max, tp->snd_nxt);
1782
1783 db_print_indent(indent);
1784 db_printf("snd_up: 0x%08x snd_wl1: 0x%08x snd_wl2: 0x%08x\n",
1785 tp->snd_up, tp->snd_wl1, tp->snd_wl2);
1786
1787 db_print_indent(indent);
1788 db_printf("iss: 0x%08x irs: 0x%08x rcv_nxt: 0x%08x\n",
1789 tp->iss, tp->irs, tp->rcv_nxt);
1790
1791 db_print_indent(indent);
1792 db_printf("rcv_adv: 0x%08x rcv_wnd: %lu rcv_up: 0x%08x\n",
1793 tp->rcv_adv, tp->rcv_wnd, tp->rcv_up);
1794
1795 db_print_indent(indent);
1796 db_printf("snd_wnd: %lu snd_cwnd: %lu snd_bwnd: %lu\n",
1797 tp->snd_wnd, tp->snd_cwnd, tp->snd_bwnd);
1798
1799 db_print_indent(indent);
1800 db_printf("snd_ssthresh: %lu snd_bandwidth: %lu snd_recover: "
1801 "0x%08x\n", tp->snd_ssthresh, tp->snd_bandwidth,
1802 tp->snd_recover);
1803
1804 db_print_indent(indent);
1805 db_printf("t_maxopd: %u t_rcvtime: %u t_startime: %u\n",
1806 tp->t_maxopd, tp->t_rcvtime, tp->t_starttime);
1807
1808 db_print_indent(indent);
1809 db_printf("t_rttime: %u t_rtsq: 0x%08x t_bw_rtttime: %u\n",
1810 tp->t_rtttime, tp->t_rtseq, tp->t_bw_rtttime);
1811
1812 db_print_indent(indent);
1813 db_printf("t_bw_rtseq: 0x%08x t_rxtcur: %d t_maxseg: %u "
1814 "t_srtt: %d\n", tp->t_bw_rtseq, tp->t_rxtcur, tp->t_maxseg,
1815 tp->t_srtt);
1816
1817 db_print_indent(indent);
1818 db_printf("t_rttvar: %d t_rxtshift: %d t_rttmin: %u "
1819 "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin,
1820 tp->t_rttbest);
1821
1822 db_print_indent(indent);
1823 db_printf("t_rttupdated: %lu max_sndwnd: %lu t_softerror: %d\n",
1824 tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror);
1825
1826 db_print_indent(indent);
1827 db_printf("t_oobflags: 0x%x (", tp->t_oobflags);
1828 db_print_toobflags(tp->t_oobflags);
1829 db_printf(") t_iobc: 0x%02x\n", tp->t_iobc);
1830
1831 db_print_indent(indent);
1832 db_printf("snd_scale: %u rcv_scale: %u request_r_scale: %u\n",
1833 tp->snd_scale, tp->rcv_scale, tp->request_r_scale);
1834
1835 db_print_indent(indent);
1836 db_printf("ts_recent: %u ts_recent_age: %u\n",
1837 tp->ts_recent, tp->ts_recent_age);
1838
1839 db_print_indent(indent);
1840 db_printf("ts_offset: %u last_ack_sent: 0x%08x snd_cwnd_prev: "
1841 "%lu\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev);
1842
1843 db_print_indent(indent);
1844 db_printf("snd_ssthresh_prev: %lu snd_recover_prev: 0x%08x "
1845 "t_badrxtwin: %u\n", tp->snd_ssthresh_prev,
1846 tp->snd_recover_prev, tp->t_badrxtwin);
1847
1848 db_print_indent(indent);
1849 db_printf("snd_numholes: %d snd_holes first: %p\n",
1850 tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes));
1851
1852 db_print_indent(indent);
1853 db_printf("snd_fack: 0x%08x rcv_numsacks: %d sack_newdata: "
1854 "0x%08x\n", tp->snd_fack, tp->rcv_numsacks, tp->sack_newdata);
1855
1856 /* Skip sackblks, sackhint. */
1857
1858 db_print_indent(indent);
1859 db_printf("t_rttlow: %d rfbuf_ts: %u rfbuf_cnt: %d\n",
1860 tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt);
1861 }
1862
1863 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb)
1864 {
1865 struct tcpcb *tp;
1866
1867 if (!have_addr) {
1868 db_printf("usage: show tcpcb <addr>\n");
1869 return;
1870 }
1871 tp = (struct tcpcb *)addr;
1872
1873 db_print_tcpcb(tp, "tcpcb", 0);
1874 }
1875 #endif
Cache object: 3b51c17f2e6c234ee59e94b3b2bb59cf
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