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 * Copyright (c) 2010-2011 Juniper Networks, Inc.
6 * All rights reserved.
7 *
8 * Portions of this software were developed by Robert N. M. Watson under
9 * contract to Juniper Networks, Inc.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * From: @(#)tcp_usrreq.c 8.2 (Berkeley) 1/3/94
36 */
37
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD: releng/10.4/sys/netinet/tcp_usrreq.c 338980 2018-09-27 18:34:42Z gordon $");
40
41 #include "opt_ddb.h"
42 #include "opt_inet.h"
43 #include "opt_inet6.h"
44 #include "opt_tcpdebug.h"
45
46 #include <sys/param.h>
47 #include <sys/systm.h>
48 #include <sys/limits.h>
49 #include <sys/malloc.h>
50 #include <sys/kernel.h>
51 #include <sys/sysctl.h>
52 #include <sys/mbuf.h>
53 #ifdef INET6
54 #include <sys/domain.h>
55 #endif /* INET6 */
56 #include <sys/socket.h>
57 #include <sys/socketvar.h>
58 #include <sys/protosw.h>
59 #include <sys/proc.h>
60 #include <sys/jail.h>
61 #include <sys/syslog.h>
62
63 #ifdef DDB
64 #include <ddb/ddb.h>
65 #endif
66
67 #include <net/if.h>
68 #include <net/route.h>
69 #include <net/vnet.h>
70
71 #include <netinet/cc.h>
72 #include <netinet/in.h>
73 #include <netinet/in_pcb.h>
74 #include <netinet/in_systm.h>
75 #include <netinet/in_var.h>
76 #include <netinet/ip_var.h>
77 #ifdef INET6
78 #include <netinet/ip6.h>
79 #include <netinet6/in6_pcb.h>
80 #include <netinet6/ip6_var.h>
81 #include <netinet6/scope6_var.h>
82 #endif
83 #ifdef TCP_RFC7413
84 #include <netinet/tcp_fastopen.h>
85 #endif
86 #include <netinet/tcp_fsm.h>
87 #include <netinet/tcp_seq.h>
88 #include <netinet/tcp_timer.h>
89 #include <netinet/tcp_var.h>
90 #include <netinet/tcpip.h>
91 #ifdef TCPDEBUG
92 #include <netinet/tcp_debug.h>
93 #endif
94 #ifdef TCP_OFFLOAD
95 #include <netinet/tcp_offload.h>
96 #endif
97
98 /*
99 * TCP protocol interface to socket abstraction.
100 */
101 static int tcp_attach(struct socket *);
102 #ifdef INET
103 static int tcp_connect(struct tcpcb *, struct sockaddr *,
104 struct thread *td);
105 #endif /* INET */
106 #ifdef INET6
107 static int tcp6_connect(struct tcpcb *, struct sockaddr *,
108 struct thread *td);
109 #endif /* INET6 */
110 static void tcp_disconnect(struct tcpcb *);
111 static void tcp_usrclosed(struct tcpcb *);
112 static void tcp_fill_info(struct tcpcb *, struct tcp_info *);
113
114 #ifdef TCPDEBUG
115 #define TCPDEBUG0 int ostate = 0
116 #define TCPDEBUG1() ostate = tp ? tp->t_state : 0
117 #define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \
118 tcp_trace(TA_USER, ostate, tp, 0, 0, req)
119 #else
120 #define TCPDEBUG0
121 #define TCPDEBUG1()
122 #define TCPDEBUG2(req)
123 #endif
124
125 /*
126 * TCP attaches to socket via pru_attach(), reserving space,
127 * and an internet control block.
128 */
129 static int
130 tcp_usr_attach(struct socket *so, int proto, struct thread *td)
131 {
132 struct inpcb *inp;
133 struct tcpcb *tp = NULL;
134 int error;
135 TCPDEBUG0;
136
137 inp = sotoinpcb(so);
138 KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL"));
139 TCPDEBUG1();
140
141 error = tcp_attach(so);
142 if (error)
143 goto out;
144
145 if ((so->so_options & SO_LINGER) && so->so_linger == 0)
146 so->so_linger = TCP_LINGERTIME;
147
148 inp = sotoinpcb(so);
149 tp = intotcpcb(inp);
150 out:
151 TCPDEBUG2(PRU_ATTACH);
152 return error;
153 }
154
155 /*
156 * tcp_detach is called when the socket layer loses its final reference
157 * to the socket, be it a file descriptor reference, a reference from TCP,
158 * etc. At this point, there is only one case in which we will keep around
159 * inpcb state: time wait.
160 *
161 * This function can probably be re-absorbed back into tcp_usr_detach() now
162 * that there is a single detach path.
163 */
164 static void
165 tcp_detach(struct socket *so, struct inpcb *inp)
166 {
167 struct tcpcb *tp;
168
169 INP_INFO_LOCK_ASSERT(&V_tcbinfo);
170 INP_WLOCK_ASSERT(inp);
171
172 KASSERT(so->so_pcb == inp, ("tcp_detach: so_pcb != inp"));
173 KASSERT(inp->inp_socket == so, ("tcp_detach: inp_socket != so"));
174
175 tp = intotcpcb(inp);
176
177 if (inp->inp_flags & INP_TIMEWAIT) {
178 /*
179 * There are two cases to handle: one in which the time wait
180 * state is being discarded (INP_DROPPED), and one in which
181 * this connection will remain in timewait. In the former,
182 * it is time to discard all state (except tcptw, which has
183 * already been discarded by the timewait close code, which
184 * should be further up the call stack somewhere). In the
185 * latter case, we detach from the socket, but leave the pcb
186 * present until timewait ends.
187 *
188 * XXXRW: Would it be cleaner to free the tcptw here?
189 *
190 * Astute question indeed, from twtcp perspective there are
191 * three cases to consider:
192 *
193 * #1 tcp_detach is called at tcptw creation time by
194 * tcp_twstart, then do not discard the newly created tcptw
195 * and leave inpcb present until timewait ends
196 * #2 tcp_detach is called at timewait end (or reuse) by
197 * tcp_twclose, then the tcptw has already been discarded
198 * (or reused) and inpcb is freed here
199 * #3 tcp_detach is called() after timewait ends (or reuse)
200 * (e.g. by soclose), then tcptw has already been discarded
201 * (or reused) and inpcb is freed here
202 *
203 * In all three cases the tcptw should not be freed here.
204 */
205 if (inp->inp_flags & INP_DROPPED) {
206 in_pcbdetach(inp);
207 if (__predict_true(tp == NULL)) {
208 in_pcbfree(inp);
209 } else {
210 /*
211 * This case should not happen as in TIMEWAIT
212 * state the inp should not be destroyed before
213 * its tcptw. If INVARIANTS is defined, panic.
214 */
215 #ifdef INVARIANTS
216 panic("%s: Panic before an inp double-free: "
217 "INP_TIMEWAIT && INP_DROPPED && tp != NULL"
218 , __func__);
219 #else
220 log(LOG_ERR, "%s: Avoid an inp double-free: "
221 "INP_TIMEWAIT && INP_DROPPED && tp != NULL"
222 , __func__);
223 #endif
224 INP_WUNLOCK(inp);
225 }
226 } else {
227 in_pcbdetach(inp);
228 INP_WUNLOCK(inp);
229 }
230 } else {
231 /*
232 * If the connection is not in timewait, we consider two
233 * two conditions: one in which no further processing is
234 * necessary (dropped || embryonic), and one in which TCP is
235 * not yet done, but no longer requires the socket, so the
236 * pcb will persist for the time being.
237 *
238 * XXXRW: Does the second case still occur?
239 */
240 if (inp->inp_flags & INP_DROPPED ||
241 tp->t_state < TCPS_SYN_SENT) {
242 tcp_discardcb(tp);
243 in_pcbdetach(inp);
244 in_pcbfree(inp);
245 } else {
246 in_pcbdetach(inp);
247 INP_WUNLOCK(inp);
248 }
249 }
250 }
251
252 /*
253 * pru_detach() detaches the TCP protocol from the socket.
254 * If the protocol state is non-embryonic, then can't
255 * do this directly: have to initiate a pru_disconnect(),
256 * which may finish later; embryonic TCB's can just
257 * be discarded here.
258 */
259 static void
260 tcp_usr_detach(struct socket *so)
261 {
262 struct inpcb *inp;
263 int rlock = 0;
264
265 inp = sotoinpcb(so);
266 KASSERT(inp != NULL, ("tcp_usr_detach: inp == NULL"));
267 if (!INP_INFO_WLOCKED(&V_tcbinfo)) {
268 INP_INFO_RLOCK(&V_tcbinfo);
269 rlock = 1;
270 }
271 INP_WLOCK(inp);
272 KASSERT(inp->inp_socket != NULL,
273 ("tcp_usr_detach: inp_socket == NULL"));
274 tcp_detach(so, inp);
275 if (rlock)
276 INP_INFO_RUNLOCK(&V_tcbinfo);
277 }
278
279 #ifdef INET
280 /*
281 * Give the socket an address.
282 */
283 static int
284 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
285 {
286 int error = 0;
287 struct inpcb *inp;
288 struct tcpcb *tp = NULL;
289 struct sockaddr_in *sinp;
290
291 sinp = (struct sockaddr_in *)nam;
292 if (nam->sa_len != sizeof (*sinp))
293 return (EINVAL);
294 /*
295 * Must check for multicast addresses and disallow binding
296 * to them.
297 */
298 if (sinp->sin_family == AF_INET &&
299 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
300 return (EAFNOSUPPORT);
301
302 TCPDEBUG0;
303 inp = sotoinpcb(so);
304 KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL"));
305 INP_WLOCK(inp);
306 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
307 error = EINVAL;
308 goto out;
309 }
310 tp = intotcpcb(inp);
311 TCPDEBUG1();
312 INP_HASH_WLOCK(&V_tcbinfo);
313 error = in_pcbbind(inp, nam, td->td_ucred);
314 INP_HASH_WUNLOCK(&V_tcbinfo);
315 out:
316 TCPDEBUG2(PRU_BIND);
317 INP_WUNLOCK(inp);
318
319 return (error);
320 }
321 #endif /* INET */
322
323 #ifdef INET6
324 static int
325 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
326 {
327 int error = 0;
328 struct inpcb *inp;
329 struct tcpcb *tp = NULL;
330 struct sockaddr_in6 *sin6p;
331 u_char vflagsav;
332
333 sin6p = (struct sockaddr_in6 *)nam;
334 if (nam->sa_len != sizeof (*sin6p))
335 return (EINVAL);
336 /*
337 * Must check for multicast addresses and disallow binding
338 * to them.
339 */
340 if (sin6p->sin6_family == AF_INET6 &&
341 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr))
342 return (EAFNOSUPPORT);
343
344 TCPDEBUG0;
345 inp = sotoinpcb(so);
346 KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL"));
347 INP_WLOCK(inp);
348 vflagsav = inp->inp_vflag;
349 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
350 error = EINVAL;
351 goto out;
352 }
353 tp = intotcpcb(inp);
354 TCPDEBUG1();
355 INP_HASH_WLOCK(&V_tcbinfo);
356 inp->inp_vflag &= ~INP_IPV4;
357 inp->inp_vflag |= INP_IPV6;
358 #ifdef INET
359 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
360 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr))
361 inp->inp_vflag |= INP_IPV4;
362 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
363 struct sockaddr_in sin;
364
365 in6_sin6_2_sin(&sin, sin6p);
366 inp->inp_vflag |= INP_IPV4;
367 inp->inp_vflag &= ~INP_IPV6;
368 error = in_pcbbind(inp, (struct sockaddr *)&sin,
369 td->td_ucred);
370 INP_HASH_WUNLOCK(&V_tcbinfo);
371 goto out;
372 }
373 }
374 #endif
375 error = in6_pcbbind(inp, nam, td->td_ucred);
376 INP_HASH_WUNLOCK(&V_tcbinfo);
377 out:
378 if (error != 0)
379 inp->inp_vflag = vflagsav;
380 TCPDEBUG2(PRU_BIND);
381 INP_WUNLOCK(inp);
382 return (error);
383 }
384 #endif /* INET6 */
385
386 #ifdef INET
387 /*
388 * Prepare to accept connections.
389 */
390 static int
391 tcp_usr_listen(struct socket *so, int backlog, struct thread *td)
392 {
393 int error = 0;
394 struct inpcb *inp;
395 struct tcpcb *tp = NULL;
396
397 TCPDEBUG0;
398 inp = sotoinpcb(so);
399 KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL"));
400 INP_WLOCK(inp);
401 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
402 error = EINVAL;
403 goto out;
404 }
405 tp = intotcpcb(inp);
406 TCPDEBUG1();
407 SOCK_LOCK(so);
408 error = solisten_proto_check(so);
409 INP_HASH_WLOCK(&V_tcbinfo);
410 if (error == 0 && inp->inp_lport == 0)
411 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
412 INP_HASH_WUNLOCK(&V_tcbinfo);
413 if (error == 0) {
414 tcp_state_change(tp, TCPS_LISTEN);
415 solisten_proto(so, backlog);
416 #ifdef TCP_OFFLOAD
417 if ((so->so_options & SO_NO_OFFLOAD) == 0)
418 tcp_offload_listen_start(tp);
419 #endif
420 }
421 SOCK_UNLOCK(so);
422
423 #ifdef TCP_RFC7413
424 if (tp->t_flags & TF_FASTOPEN)
425 tp->t_tfo_pending = tcp_fastopen_alloc_counter();
426 #endif
427 out:
428 TCPDEBUG2(PRU_LISTEN);
429 INP_WUNLOCK(inp);
430 return (error);
431 }
432 #endif /* INET */
433
434 #ifdef INET6
435 static int
436 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td)
437 {
438 int error = 0;
439 struct inpcb *inp;
440 struct tcpcb *tp = NULL;
441 u_char vflagsav;
442
443 TCPDEBUG0;
444 inp = sotoinpcb(so);
445 KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL"));
446 INP_WLOCK(inp);
447 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
448 error = EINVAL;
449 goto out;
450 }
451 vflagsav = inp->inp_vflag;
452 tp = intotcpcb(inp);
453 TCPDEBUG1();
454 SOCK_LOCK(so);
455 error = solisten_proto_check(so);
456 INP_HASH_WLOCK(&V_tcbinfo);
457 if (error == 0 && inp->inp_lport == 0) {
458 inp->inp_vflag &= ~INP_IPV4;
459 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
460 inp->inp_vflag |= INP_IPV4;
461 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
462 }
463 INP_HASH_WUNLOCK(&V_tcbinfo);
464 if (error == 0) {
465 tcp_state_change(tp, TCPS_LISTEN);
466 solisten_proto(so, backlog);
467 #ifdef TCP_OFFLOAD
468 if ((so->so_options & SO_NO_OFFLOAD) == 0)
469 tcp_offload_listen_start(tp);
470 #endif
471 }
472 SOCK_UNLOCK(so);
473
474 #ifdef TCP_RFC7413
475 if (tp->t_flags & TF_FASTOPEN)
476 tp->t_tfo_pending = tcp_fastopen_alloc_counter();
477 #endif
478 if (error != 0)
479 inp->inp_vflag = vflagsav;
480
481 out:
482 TCPDEBUG2(PRU_LISTEN);
483 INP_WUNLOCK(inp);
484 return (error);
485 }
486 #endif /* INET6 */
487
488 #ifdef INET
489 /*
490 * Initiate connection to peer.
491 * Create a template for use in transmissions on this connection.
492 * Enter SYN_SENT state, and mark socket as connecting.
493 * Start keep-alive timer, and seed output sequence space.
494 * Send initial segment on connection.
495 */
496 static int
497 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
498 {
499 int error = 0;
500 struct inpcb *inp;
501 struct tcpcb *tp = NULL;
502 struct sockaddr_in *sinp;
503
504 sinp = (struct sockaddr_in *)nam;
505 if (nam->sa_len != sizeof (*sinp))
506 return (EINVAL);
507 /*
508 * Must disallow TCP ``connections'' to multicast addresses.
509 */
510 if (sinp->sin_family == AF_INET
511 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
512 return (EAFNOSUPPORT);
513 if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0)
514 return (error);
515
516 TCPDEBUG0;
517 inp = sotoinpcb(so);
518 KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL"));
519 INP_WLOCK(inp);
520 if (inp->inp_flags & INP_TIMEWAIT) {
521 error = EADDRINUSE;
522 goto out;
523 }
524 if (inp->inp_flags & INP_DROPPED) {
525 error = ECONNREFUSED;
526 goto out;
527 }
528 tp = intotcpcb(inp);
529 TCPDEBUG1();
530 if ((error = tcp_connect(tp, nam, td)) != 0)
531 goto out;
532 #ifdef TCP_OFFLOAD
533 if (registered_toedevs > 0 &&
534 (so->so_options & SO_NO_OFFLOAD) == 0 &&
535 (error = tcp_offload_connect(so, nam)) == 0)
536 goto out;
537 #endif
538 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp));
539 error = tcp_output(tp);
540 out:
541 TCPDEBUG2(PRU_CONNECT);
542 INP_WUNLOCK(inp);
543 return (error);
544 }
545 #endif /* INET */
546
547 #ifdef INET6
548 static int
549 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
550 {
551 int error = 0;
552 struct inpcb *inp;
553 struct tcpcb *tp = NULL;
554 struct sockaddr_in6 *sin6p;
555 u_int8_t incflagsav;
556 u_char vflagsav;
557
558 TCPDEBUG0;
559
560 sin6p = (struct sockaddr_in6 *)nam;
561 if (nam->sa_len != sizeof (*sin6p))
562 return (EINVAL);
563 /*
564 * Must disallow TCP ``connections'' to multicast addresses.
565 */
566 if (sin6p->sin6_family == AF_INET6
567 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr))
568 return (EAFNOSUPPORT);
569
570 inp = sotoinpcb(so);
571 KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL"));
572 INP_WLOCK(inp);
573 vflagsav = inp->inp_vflag;
574 incflagsav = inp->inp_inc.inc_flags;
575 if (inp->inp_flags & INP_TIMEWAIT) {
576 error = EADDRINUSE;
577 goto out;
578 }
579 if (inp->inp_flags & INP_DROPPED) {
580 error = ECONNREFUSED;
581 goto out;
582 }
583 tp = intotcpcb(inp);
584 TCPDEBUG1();
585 #ifdef INET
586 /*
587 * XXXRW: Some confusion: V4/V6 flags relate to binding, and
588 * therefore probably require the hash lock, which isn't held here.
589 * Is this a significant problem?
590 */
591 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
592 struct sockaddr_in sin;
593
594 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
595 error = EINVAL;
596 goto out;
597 }
598
599 in6_sin6_2_sin(&sin, sin6p);
600 if ((error = prison_remote_ip4(td->td_ucred,
601 &sin.sin_addr)) != 0)
602 goto out;
603 inp->inp_vflag |= INP_IPV4;
604 inp->inp_vflag &= ~INP_IPV6;
605 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0)
606 goto out;
607 #ifdef TCP_OFFLOAD
608 if (registered_toedevs > 0 &&
609 (so->so_options & SO_NO_OFFLOAD) == 0 &&
610 (error = tcp_offload_connect(so, nam)) == 0)
611 goto out;
612 #endif
613 error = tcp_output(tp);
614 goto out;
615 }
616 #endif
617 if ((error = prison_remote_ip6(td->td_ucred, &sin6p->sin6_addr)) != 0)
618 goto out;
619 inp->inp_vflag &= ~INP_IPV4;
620 inp->inp_vflag |= INP_IPV6;
621 inp->inp_inc.inc_flags |= INC_ISIPV6;
622 if ((error = tcp6_connect(tp, nam, td)) != 0)
623 goto out;
624 #ifdef TCP_OFFLOAD
625 if (registered_toedevs > 0 &&
626 (so->so_options & SO_NO_OFFLOAD) == 0 &&
627 (error = tcp_offload_connect(so, nam)) == 0)
628 goto out;
629 #endif
630 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp));
631 error = tcp_output(tp);
632
633 out:
634 /*
635 * If the implicit bind in the connect call fails, restore
636 * the flags we modified.
637 */
638 if (error != 0 && inp->inp_lport == 0) {
639 inp->inp_vflag = vflagsav;
640 inp->inp_inc.inc_flags = incflagsav;
641 }
642
643 TCPDEBUG2(PRU_CONNECT);
644 INP_WUNLOCK(inp);
645 return (error);
646 }
647 #endif /* INET6 */
648
649 /*
650 * Initiate disconnect from peer.
651 * If connection never passed embryonic stage, just drop;
652 * else if don't need to let data drain, then can just drop anyways,
653 * else have to begin TCP shutdown process: mark socket disconnecting,
654 * drain unread data, state switch to reflect user close, and
655 * send segment (e.g. FIN) to peer. Socket will be really disconnected
656 * when peer sends FIN and acks ours.
657 *
658 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
659 */
660 static int
661 tcp_usr_disconnect(struct socket *so)
662 {
663 struct inpcb *inp;
664 struct tcpcb *tp = NULL;
665 int error = 0;
666
667 TCPDEBUG0;
668 INP_INFO_RLOCK(&V_tcbinfo);
669 inp = sotoinpcb(so);
670 KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL"));
671 INP_WLOCK(inp);
672 if (inp->inp_flags & INP_TIMEWAIT)
673 goto out;
674 if (inp->inp_flags & INP_DROPPED) {
675 error = ECONNRESET;
676 goto out;
677 }
678 tp = intotcpcb(inp);
679 TCPDEBUG1();
680 tcp_disconnect(tp);
681 out:
682 TCPDEBUG2(PRU_DISCONNECT);
683 INP_WUNLOCK(inp);
684 INP_INFO_RUNLOCK(&V_tcbinfo);
685 return (error);
686 }
687
688 #ifdef INET
689 /*
690 * Accept a connection. Essentially all the work is done at higher levels;
691 * just return the address of the peer, storing through addr.
692 */
693 static int
694 tcp_usr_accept(struct socket *so, struct sockaddr **nam)
695 {
696 int error = 0;
697 struct inpcb *inp = NULL;
698 struct tcpcb *tp = NULL;
699 struct in_addr addr;
700 in_port_t port = 0;
701 TCPDEBUG0;
702
703 if (so->so_state & SS_ISDISCONNECTED)
704 return (ECONNABORTED);
705
706 inp = sotoinpcb(so);
707 KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL"));
708 INP_WLOCK(inp);
709 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
710 error = ECONNABORTED;
711 goto out;
712 }
713 tp = intotcpcb(inp);
714 TCPDEBUG1();
715
716 /*
717 * We inline in_getpeeraddr and COMMON_END here, so that we can
718 * copy the data of interest and defer the malloc until after we
719 * release the lock.
720 */
721 port = inp->inp_fport;
722 addr = inp->inp_faddr;
723
724 out:
725 TCPDEBUG2(PRU_ACCEPT);
726 INP_WUNLOCK(inp);
727 if (error == 0)
728 *nam = in_sockaddr(port, &addr);
729 return error;
730 }
731 #endif /* INET */
732
733 #ifdef INET6
734 static int
735 tcp6_usr_accept(struct socket *so, struct sockaddr **nam)
736 {
737 struct inpcb *inp = NULL;
738 int error = 0;
739 struct tcpcb *tp = NULL;
740 struct in_addr addr;
741 struct in6_addr addr6;
742 in_port_t port = 0;
743 int v4 = 0;
744 TCPDEBUG0;
745
746 if (so->so_state & SS_ISDISCONNECTED)
747 return (ECONNABORTED);
748
749 inp = sotoinpcb(so);
750 KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL"));
751 INP_INFO_RLOCK(&V_tcbinfo);
752 INP_WLOCK(inp);
753 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
754 error = ECONNABORTED;
755 goto out;
756 }
757 tp = intotcpcb(inp);
758 TCPDEBUG1();
759
760 /*
761 * We inline in6_mapped_peeraddr and COMMON_END here, so that we can
762 * copy the data of interest and defer the malloc until after we
763 * release the lock.
764 */
765 if (inp->inp_vflag & INP_IPV4) {
766 v4 = 1;
767 port = inp->inp_fport;
768 addr = inp->inp_faddr;
769 } else {
770 port = inp->inp_fport;
771 addr6 = inp->in6p_faddr;
772 }
773
774 out:
775 TCPDEBUG2(PRU_ACCEPT);
776 INP_WUNLOCK(inp);
777 INP_INFO_RUNLOCK(&V_tcbinfo);
778 if (error == 0) {
779 if (v4)
780 *nam = in6_v4mapsin6_sockaddr(port, &addr);
781 else
782 *nam = in6_sockaddr(port, &addr6);
783 }
784 return error;
785 }
786 #endif /* INET6 */
787
788 /*
789 * Mark the connection as being incapable of further output.
790 */
791 static int
792 tcp_usr_shutdown(struct socket *so)
793 {
794 int error = 0;
795 struct inpcb *inp;
796 struct tcpcb *tp = NULL;
797
798 TCPDEBUG0;
799 INP_INFO_RLOCK(&V_tcbinfo);
800 inp = sotoinpcb(so);
801 KASSERT(inp != NULL, ("inp == NULL"));
802 INP_WLOCK(inp);
803 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
804 error = ECONNRESET;
805 goto out;
806 }
807 tp = intotcpcb(inp);
808 TCPDEBUG1();
809 socantsendmore(so);
810 tcp_usrclosed(tp);
811 if (!(inp->inp_flags & INP_DROPPED))
812 error = tcp_output(tp);
813
814 out:
815 TCPDEBUG2(PRU_SHUTDOWN);
816 INP_WUNLOCK(inp);
817 INP_INFO_RUNLOCK(&V_tcbinfo);
818
819 return (error);
820 }
821
822 /*
823 * After a receive, possibly send window update to peer.
824 */
825 static int
826 tcp_usr_rcvd(struct socket *so, int flags)
827 {
828 struct inpcb *inp;
829 struct tcpcb *tp = NULL;
830 int error = 0;
831
832 TCPDEBUG0;
833 inp = sotoinpcb(so);
834 KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL"));
835 INP_WLOCK(inp);
836 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
837 error = ECONNRESET;
838 goto out;
839 }
840 tp = intotcpcb(inp);
841 TCPDEBUG1();
842 #ifdef TCP_RFC7413
843 /*
844 * For passively-created TFO connections, don't attempt a window
845 * update while still in SYN_RECEIVED as this may trigger an early
846 * SYN|ACK. It is preferable to have the SYN|ACK be sent along with
847 * application response data, or failing that, when the DELACK timer
848 * expires.
849 */
850 if ((tp->t_flags & TF_FASTOPEN) &&
851 (tp->t_state == TCPS_SYN_RECEIVED))
852 goto out;
853 #endif
854 #ifdef TCP_OFFLOAD
855 if (tp->t_flags & TF_TOE)
856 tcp_offload_rcvd(tp);
857 else
858 #endif
859 tcp_output(tp);
860
861 out:
862 TCPDEBUG2(PRU_RCVD);
863 INP_WUNLOCK(inp);
864 return (error);
865 }
866
867 /*
868 * Do a send by putting data in output queue and updating urgent
869 * marker if URG set. Possibly send more data. Unlike the other
870 * pru_*() routines, the mbuf chains are our responsibility. We
871 * must either enqueue them or free them. The other pru_* routines
872 * generally are caller-frees.
873 */
874 static int
875 tcp_usr_send(struct socket *so, int flags, struct mbuf *m,
876 struct sockaddr *nam, struct mbuf *control, struct thread *td)
877 {
878 int error = 0;
879 struct inpcb *inp;
880 struct tcpcb *tp = NULL;
881 #ifdef INET6
882 int isipv6;
883 #endif
884 TCPDEBUG0;
885
886 /*
887 * We require the pcbinfo lock if we will close the socket as part of
888 * this call.
889 */
890 if (flags & PRUS_EOF)
891 INP_INFO_RLOCK(&V_tcbinfo);
892 inp = sotoinpcb(so);
893 KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL"));
894 INP_WLOCK(inp);
895 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
896 if (control)
897 m_freem(control);
898 if (m)
899 m_freem(m);
900 error = ECONNRESET;
901 goto out;
902 }
903 #ifdef INET6
904 isipv6 = nam && nam->sa_family == AF_INET6;
905 #endif /* INET6 */
906 tp = intotcpcb(inp);
907 TCPDEBUG1();
908 if (control) {
909 /* TCP doesn't do control messages (rights, creds, etc) */
910 if (control->m_len) {
911 m_freem(control);
912 if (m)
913 m_freem(m);
914 error = EINVAL;
915 goto out;
916 }
917 m_freem(control); /* empty control, just free it */
918 }
919 if (!(flags & PRUS_OOB)) {
920 sbappendstream(&so->so_snd, m);
921 if (nam && tp->t_state < TCPS_SYN_SENT) {
922 /*
923 * Do implied connect if not yet connected,
924 * initialize window to default value, and
925 * initialize maxseg/maxopd using peer's cached
926 * MSS.
927 */
928 #ifdef INET6
929 if (isipv6)
930 error = tcp6_connect(tp, nam, td);
931 #endif /* INET6 */
932 #if defined(INET6) && defined(INET)
933 else
934 #endif
935 #ifdef INET
936 error = tcp_connect(tp, nam, td);
937 #endif
938 if (error)
939 goto out;
940 tp->snd_wnd = TTCP_CLIENT_SND_WND;
941 tcp_mss(tp, -1);
942 }
943 if (flags & PRUS_EOF) {
944 /*
945 * Close the send side of the connection after
946 * the data is sent.
947 */
948 INP_INFO_RLOCK_ASSERT(&V_tcbinfo);
949 socantsendmore(so);
950 tcp_usrclosed(tp);
951 }
952 if (!(inp->inp_flags & INP_DROPPED)) {
953 if (flags & PRUS_MORETOCOME)
954 tp->t_flags |= TF_MORETOCOME;
955 error = tcp_output(tp);
956 if (flags & PRUS_MORETOCOME)
957 tp->t_flags &= ~TF_MORETOCOME;
958 }
959 } else {
960 /*
961 * XXXRW: PRUS_EOF not implemented with PRUS_OOB?
962 */
963 SOCKBUF_LOCK(&so->so_snd);
964 if (sbspace(&so->so_snd) < -512) {
965 SOCKBUF_UNLOCK(&so->so_snd);
966 m_freem(m);
967 error = ENOBUFS;
968 goto out;
969 }
970 /*
971 * According to RFC961 (Assigned Protocols),
972 * the urgent pointer points to the last octet
973 * of urgent data. We continue, however,
974 * to consider it to indicate the first octet
975 * of data past the urgent section.
976 * Otherwise, snd_up should be one lower.
977 */
978 sbappendstream_locked(&so->so_snd, m);
979 SOCKBUF_UNLOCK(&so->so_snd);
980 if (nam && tp->t_state < TCPS_SYN_SENT) {
981 /*
982 * Do implied connect if not yet connected,
983 * initialize window to default value, and
984 * initialize maxseg/maxopd using peer's cached
985 * MSS.
986 */
987 #ifdef INET6
988 if (isipv6)
989 error = tcp6_connect(tp, nam, td);
990 #endif /* INET6 */
991 #if defined(INET6) && defined(INET)
992 else
993 #endif
994 #ifdef INET
995 error = tcp_connect(tp, nam, td);
996 #endif
997 if (error)
998 goto out;
999 tp->snd_wnd = TTCP_CLIENT_SND_WND;
1000 tcp_mss(tp, -1);
1001 }
1002 tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
1003 tp->t_flags |= TF_FORCEDATA;
1004 error = tcp_output(tp);
1005 tp->t_flags &= ~TF_FORCEDATA;
1006 }
1007 out:
1008 TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB :
1009 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
1010 INP_WUNLOCK(inp);
1011 if (flags & PRUS_EOF)
1012 INP_INFO_RUNLOCK(&V_tcbinfo);
1013 return (error);
1014 }
1015
1016 /*
1017 * Abort the TCP. Drop the connection abruptly.
1018 */
1019 static void
1020 tcp_usr_abort(struct socket *so)
1021 {
1022 struct inpcb *inp;
1023 struct tcpcb *tp = NULL;
1024 TCPDEBUG0;
1025
1026 inp = sotoinpcb(so);
1027 KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL"));
1028
1029 INP_INFO_RLOCK(&V_tcbinfo);
1030 INP_WLOCK(inp);
1031 KASSERT(inp->inp_socket != NULL,
1032 ("tcp_usr_abort: inp_socket == NULL"));
1033
1034 /*
1035 * If we still have full TCP state, and we're not dropped, drop.
1036 */
1037 if (!(inp->inp_flags & INP_TIMEWAIT) &&
1038 !(inp->inp_flags & INP_DROPPED)) {
1039 tp = intotcpcb(inp);
1040 TCPDEBUG1();
1041 tcp_drop(tp, ECONNABORTED);
1042 TCPDEBUG2(PRU_ABORT);
1043 }
1044 if (!(inp->inp_flags & INP_DROPPED)) {
1045 SOCK_LOCK(so);
1046 so->so_state |= SS_PROTOREF;
1047 SOCK_UNLOCK(so);
1048 inp->inp_flags |= INP_SOCKREF;
1049 }
1050 INP_WUNLOCK(inp);
1051 INP_INFO_RUNLOCK(&V_tcbinfo);
1052 }
1053
1054 /*
1055 * TCP socket is closed. Start friendly disconnect.
1056 */
1057 static void
1058 tcp_usr_close(struct socket *so)
1059 {
1060 struct inpcb *inp;
1061 struct tcpcb *tp = NULL;
1062 TCPDEBUG0;
1063
1064 inp = sotoinpcb(so);
1065 KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL"));
1066
1067 INP_INFO_RLOCK(&V_tcbinfo);
1068 INP_WLOCK(inp);
1069 KASSERT(inp->inp_socket != NULL,
1070 ("tcp_usr_close: inp_socket == NULL"));
1071
1072 /*
1073 * If we still have full TCP state, and we're not dropped, initiate
1074 * a disconnect.
1075 */
1076 if (!(inp->inp_flags & INP_TIMEWAIT) &&
1077 !(inp->inp_flags & INP_DROPPED)) {
1078 tp = intotcpcb(inp);
1079 TCPDEBUG1();
1080 tcp_disconnect(tp);
1081 TCPDEBUG2(PRU_CLOSE);
1082 }
1083 if (!(inp->inp_flags & INP_DROPPED)) {
1084 SOCK_LOCK(so);
1085 so->so_state |= SS_PROTOREF;
1086 SOCK_UNLOCK(so);
1087 inp->inp_flags |= INP_SOCKREF;
1088 }
1089 INP_WUNLOCK(inp);
1090 INP_INFO_RUNLOCK(&V_tcbinfo);
1091 }
1092
1093 /*
1094 * Receive out-of-band data.
1095 */
1096 static int
1097 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags)
1098 {
1099 int error = 0;
1100 struct inpcb *inp;
1101 struct tcpcb *tp = NULL;
1102
1103 TCPDEBUG0;
1104 inp = sotoinpcb(so);
1105 KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL"));
1106 INP_WLOCK(inp);
1107 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1108 error = ECONNRESET;
1109 goto out;
1110 }
1111 tp = intotcpcb(inp);
1112 TCPDEBUG1();
1113 if ((so->so_oobmark == 0 &&
1114 (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) ||
1115 so->so_options & SO_OOBINLINE ||
1116 tp->t_oobflags & TCPOOB_HADDATA) {
1117 error = EINVAL;
1118 goto out;
1119 }
1120 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
1121 error = EWOULDBLOCK;
1122 goto out;
1123 }
1124 m->m_len = 1;
1125 *mtod(m, caddr_t) = tp->t_iobc;
1126 if ((flags & MSG_PEEK) == 0)
1127 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
1128
1129 out:
1130 TCPDEBUG2(PRU_RCVOOB);
1131 INP_WUNLOCK(inp);
1132 return (error);
1133 }
1134
1135 #ifdef INET
1136 struct pr_usrreqs tcp_usrreqs = {
1137 .pru_abort = tcp_usr_abort,
1138 .pru_accept = tcp_usr_accept,
1139 .pru_attach = tcp_usr_attach,
1140 .pru_bind = tcp_usr_bind,
1141 .pru_connect = tcp_usr_connect,
1142 .pru_control = in_control,
1143 .pru_detach = tcp_usr_detach,
1144 .pru_disconnect = tcp_usr_disconnect,
1145 .pru_listen = tcp_usr_listen,
1146 .pru_peeraddr = in_getpeeraddr,
1147 .pru_rcvd = tcp_usr_rcvd,
1148 .pru_rcvoob = tcp_usr_rcvoob,
1149 .pru_send = tcp_usr_send,
1150 .pru_shutdown = tcp_usr_shutdown,
1151 .pru_sockaddr = in_getsockaddr,
1152 .pru_sosetlabel = in_pcbsosetlabel,
1153 .pru_close = tcp_usr_close,
1154 };
1155 #endif /* INET */
1156
1157 #ifdef INET6
1158 struct pr_usrreqs tcp6_usrreqs = {
1159 .pru_abort = tcp_usr_abort,
1160 .pru_accept = tcp6_usr_accept,
1161 .pru_attach = tcp_usr_attach,
1162 .pru_bind = tcp6_usr_bind,
1163 .pru_connect = tcp6_usr_connect,
1164 .pru_control = in6_control,
1165 .pru_detach = tcp_usr_detach,
1166 .pru_disconnect = tcp_usr_disconnect,
1167 .pru_listen = tcp6_usr_listen,
1168 .pru_peeraddr = in6_mapped_peeraddr,
1169 .pru_rcvd = tcp_usr_rcvd,
1170 .pru_rcvoob = tcp_usr_rcvoob,
1171 .pru_send = tcp_usr_send,
1172 .pru_shutdown = tcp_usr_shutdown,
1173 .pru_sockaddr = in6_mapped_sockaddr,
1174 .pru_sosetlabel = in_pcbsosetlabel,
1175 .pru_close = tcp_usr_close,
1176 };
1177 #endif /* INET6 */
1178
1179 #ifdef INET
1180 /*
1181 * Common subroutine to open a TCP connection to remote host specified
1182 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local
1183 * port number if needed. Call in_pcbconnect_setup to do the routing and
1184 * to choose a local host address (interface). If there is an existing
1185 * incarnation of the same connection in TIME-WAIT state and if the remote
1186 * host was sending CC options and if the connection duration was < MSL, then
1187 * truncate the previous TIME-WAIT state and proceed.
1188 * Initialize connection parameters and enter SYN-SENT state.
1189 */
1190 static int
1191 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1192 {
1193 struct inpcb *inp = tp->t_inpcb, *oinp;
1194 struct socket *so = inp->inp_socket;
1195 struct in_addr laddr;
1196 u_short lport;
1197 int error;
1198
1199 INP_WLOCK_ASSERT(inp);
1200 INP_HASH_WLOCK(&V_tcbinfo);
1201
1202 if (inp->inp_lport == 0) {
1203 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1204 if (error)
1205 goto out;
1206 }
1207
1208 /*
1209 * Cannot simply call in_pcbconnect, because there might be an
1210 * earlier incarnation of this same connection still in
1211 * TIME_WAIT state, creating an ADDRINUSE error.
1212 */
1213 laddr = inp->inp_laddr;
1214 lport = inp->inp_lport;
1215 error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport,
1216 &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred);
1217 if (error && oinp == NULL)
1218 goto out;
1219 if (oinp) {
1220 error = EADDRINUSE;
1221 goto out;
1222 }
1223 inp->inp_laddr = laddr;
1224 in_pcbrehash(inp);
1225 INP_HASH_WUNLOCK(&V_tcbinfo);
1226
1227 /*
1228 * Compute window scaling to request:
1229 * Scale to fit into sweet spot. See tcp_syncache.c.
1230 * XXX: This should move to tcp_output().
1231 */
1232 while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1233 (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1234 tp->request_r_scale++;
1235
1236 soisconnecting(so);
1237 TCPSTAT_INC(tcps_connattempt);
1238 tcp_state_change(tp, TCPS_SYN_SENT);
1239 tp->iss = tcp_new_isn(tp);
1240 tcp_sendseqinit(tp);
1241
1242 return 0;
1243
1244 out:
1245 INP_HASH_WUNLOCK(&V_tcbinfo);
1246 return (error);
1247 }
1248 #endif /* INET */
1249
1250 #ifdef INET6
1251 static int
1252 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1253 {
1254 struct inpcb *inp = tp->t_inpcb, *oinp;
1255 struct socket *so = inp->inp_socket;
1256 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
1257 struct in6_addr addr6;
1258 int error;
1259
1260 INP_WLOCK_ASSERT(inp);
1261 INP_HASH_WLOCK(&V_tcbinfo);
1262
1263 if (inp->inp_lport == 0) {
1264 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1265 if (error)
1266 goto out;
1267 }
1268
1269 /*
1270 * Cannot simply call in_pcbconnect, because there might be an
1271 * earlier incarnation of this same connection still in
1272 * TIME_WAIT state, creating an ADDRINUSE error.
1273 * in6_pcbladdr() also handles scope zone IDs.
1274 *
1275 * XXXRW: We wouldn't need to expose in6_pcblookup_hash_locked()
1276 * outside of in6_pcb.c if there were an in6_pcbconnect_setup().
1277 */
1278 error = in6_pcbladdr(inp, nam, &addr6);
1279 if (error)
1280 goto out;
1281 oinp = in6_pcblookup_hash_locked(inp->inp_pcbinfo,
1282 &sin6->sin6_addr, sin6->sin6_port,
1283 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
1284 ? &addr6
1285 : &inp->in6p_laddr,
1286 inp->inp_lport, 0, NULL);
1287 if (oinp) {
1288 error = EADDRINUSE;
1289 goto out;
1290 }
1291 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
1292 inp->in6p_laddr = addr6;
1293 inp->in6p_faddr = sin6->sin6_addr;
1294 inp->inp_fport = sin6->sin6_port;
1295 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
1296 inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
1297 if (inp->inp_flags & IN6P_AUTOFLOWLABEL)
1298 inp->inp_flow |=
1299 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
1300 in_pcbrehash(inp);
1301 INP_HASH_WUNLOCK(&V_tcbinfo);
1302
1303 /* Compute window scaling to request. */
1304 while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1305 (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1306 tp->request_r_scale++;
1307
1308 soisconnecting(so);
1309 TCPSTAT_INC(tcps_connattempt);
1310 tcp_state_change(tp, TCPS_SYN_SENT);
1311 tp->iss = tcp_new_isn(tp);
1312 tcp_sendseqinit(tp);
1313
1314 return 0;
1315
1316 out:
1317 INP_HASH_WUNLOCK(&V_tcbinfo);
1318 return error;
1319 }
1320 #endif /* INET6 */
1321
1322 /*
1323 * Export TCP internal state information via a struct tcp_info, based on the
1324 * Linux 2.6 API. Not ABI compatible as our constants are mapped differently
1325 * (TCP state machine, etc). We export all information using FreeBSD-native
1326 * constants -- for example, the numeric values for tcpi_state will differ
1327 * from Linux.
1328 */
1329 static void
1330 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti)
1331 {
1332
1333 INP_WLOCK_ASSERT(tp->t_inpcb);
1334 bzero(ti, sizeof(*ti));
1335
1336 ti->tcpi_state = tp->t_state;
1337 if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP))
1338 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS;
1339 if (tp->t_flags & TF_SACK_PERMIT)
1340 ti->tcpi_options |= TCPI_OPT_SACK;
1341 if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) {
1342 ti->tcpi_options |= TCPI_OPT_WSCALE;
1343 ti->tcpi_snd_wscale = tp->snd_scale;
1344 ti->tcpi_rcv_wscale = tp->rcv_scale;
1345 }
1346
1347 ti->tcpi_rto = tp->t_rxtcur * tick;
1348 ti->tcpi_last_data_recv = (long)(ticks - (int)tp->t_rcvtime) * tick;
1349 ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT;
1350 ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT;
1351
1352 ti->tcpi_snd_ssthresh = tp->snd_ssthresh;
1353 ti->tcpi_snd_cwnd = tp->snd_cwnd;
1354
1355 /*
1356 * FreeBSD-specific extension fields for tcp_info.
1357 */
1358 ti->tcpi_rcv_space = tp->rcv_wnd;
1359 ti->tcpi_rcv_nxt = tp->rcv_nxt;
1360 ti->tcpi_snd_wnd = tp->snd_wnd;
1361 ti->tcpi_snd_bwnd = 0; /* Unused, kept for compat. */
1362 ti->tcpi_snd_nxt = tp->snd_nxt;
1363 ti->tcpi_snd_mss = tp->t_maxseg;
1364 ti->tcpi_rcv_mss = tp->t_maxseg;
1365 if (tp->t_flags & TF_TOE)
1366 ti->tcpi_options |= TCPI_OPT_TOE;
1367 ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack;
1368 ti->tcpi_rcv_ooopack = tp->t_rcvoopack;
1369 ti->tcpi_snd_zerowin = tp->t_sndzerowin;
1370 }
1371
1372 /*
1373 * tcp_ctloutput() must drop the inpcb lock before performing copyin on
1374 * socket option arguments. When it re-acquires the lock after the copy, it
1375 * has to revalidate that the connection is still valid for the socket
1376 * option.
1377 */
1378 #define INP_WLOCK_RECHECK(inp) do { \
1379 INP_WLOCK(inp); \
1380 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { \
1381 INP_WUNLOCK(inp); \
1382 return (ECONNRESET); \
1383 } \
1384 tp = intotcpcb(inp); \
1385 } while(0)
1386
1387 int
1388 tcp_ctloutput(struct socket *so, struct sockopt *sopt)
1389 {
1390 int error, opt, optval;
1391 u_int ui;
1392 struct inpcb *inp;
1393 struct tcpcb *tp;
1394 struct tcp_info ti;
1395 char buf[TCP_CA_NAME_MAX];
1396 struct cc_algo *algo;
1397
1398 error = 0;
1399 inp = sotoinpcb(so);
1400 KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL"));
1401 INP_WLOCK(inp);
1402 if (sopt->sopt_level != IPPROTO_TCP) {
1403 #ifdef INET6
1404 if (inp->inp_vflag & INP_IPV6PROTO) {
1405 INP_WUNLOCK(inp);
1406 error = ip6_ctloutput(so, sopt);
1407 }
1408 #endif /* INET6 */
1409 #if defined(INET6) && defined(INET)
1410 else
1411 #endif
1412 #ifdef INET
1413 {
1414 INP_WUNLOCK(inp);
1415 error = ip_ctloutput(so, sopt);
1416 }
1417 #endif
1418 return (error);
1419 }
1420 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1421 INP_WUNLOCK(inp);
1422 return (ECONNRESET);
1423 }
1424
1425 switch (sopt->sopt_dir) {
1426 case SOPT_SET:
1427 switch (sopt->sopt_name) {
1428 #ifdef TCP_SIGNATURE
1429 case TCP_MD5SIG:
1430 INP_WUNLOCK(inp);
1431 error = sooptcopyin(sopt, &optval, sizeof optval,
1432 sizeof optval);
1433 if (error)
1434 return (error);
1435
1436 INP_WLOCK_RECHECK(inp);
1437 if (optval > 0)
1438 tp->t_flags |= TF_SIGNATURE;
1439 else
1440 tp->t_flags &= ~TF_SIGNATURE;
1441 goto unlock_and_done;
1442 #endif /* TCP_SIGNATURE */
1443
1444 case TCP_NODELAY:
1445 case TCP_NOOPT:
1446 INP_WUNLOCK(inp);
1447 error = sooptcopyin(sopt, &optval, sizeof optval,
1448 sizeof optval);
1449 if (error)
1450 return (error);
1451
1452 INP_WLOCK_RECHECK(inp);
1453 switch (sopt->sopt_name) {
1454 case TCP_NODELAY:
1455 opt = TF_NODELAY;
1456 break;
1457 case TCP_NOOPT:
1458 opt = TF_NOOPT;
1459 break;
1460 default:
1461 opt = 0; /* dead code to fool gcc */
1462 break;
1463 }
1464
1465 if (optval)
1466 tp->t_flags |= opt;
1467 else
1468 tp->t_flags &= ~opt;
1469 unlock_and_done:
1470 #ifdef TCP_OFFLOAD
1471 if (tp->t_flags & TF_TOE) {
1472 tcp_offload_ctloutput(tp, sopt->sopt_dir,
1473 sopt->sopt_name);
1474 }
1475 #endif
1476 INP_WUNLOCK(inp);
1477 break;
1478
1479 case TCP_NOPUSH:
1480 INP_WUNLOCK(inp);
1481 error = sooptcopyin(sopt, &optval, sizeof optval,
1482 sizeof optval);
1483 if (error)
1484 return (error);
1485
1486 INP_WLOCK_RECHECK(inp);
1487 if (optval)
1488 tp->t_flags |= TF_NOPUSH;
1489 else if (tp->t_flags & TF_NOPUSH) {
1490 tp->t_flags &= ~TF_NOPUSH;
1491 if (TCPS_HAVEESTABLISHED(tp->t_state))
1492 error = tcp_output(tp);
1493 }
1494 goto unlock_and_done;
1495
1496 case TCP_MAXSEG:
1497 INP_WUNLOCK(inp);
1498 error = sooptcopyin(sopt, &optval, sizeof optval,
1499 sizeof optval);
1500 if (error)
1501 return (error);
1502
1503 INP_WLOCK_RECHECK(inp);
1504 if (optval > 0 && optval <= tp->t_maxseg &&
1505 optval + 40 >= V_tcp_minmss)
1506 tp->t_maxseg = optval;
1507 else
1508 error = EINVAL;
1509 goto unlock_and_done;
1510
1511 case TCP_INFO:
1512 INP_WUNLOCK(inp);
1513 error = EINVAL;
1514 break;
1515
1516 case TCP_CONGESTION:
1517 INP_WUNLOCK(inp);
1518 bzero(buf, sizeof(buf));
1519 error = sooptcopyin(sopt, &buf, sizeof(buf), 1);
1520 if (error)
1521 break;
1522 INP_WLOCK_RECHECK(inp);
1523 /*
1524 * Return EINVAL if we can't find the requested cc algo.
1525 */
1526 error = EINVAL;
1527 CC_LIST_RLOCK();
1528 STAILQ_FOREACH(algo, &cc_list, entries) {
1529 if (strncmp(buf, algo->name, TCP_CA_NAME_MAX)
1530 == 0) {
1531 /* We've found the requested algo. */
1532 error = 0;
1533 /*
1534 * We hold a write lock over the tcb
1535 * so it's safe to do these things
1536 * without ordering concerns.
1537 */
1538 if (CC_ALGO(tp)->cb_destroy != NULL)
1539 CC_ALGO(tp)->cb_destroy(tp->ccv);
1540 CC_ALGO(tp) = algo;
1541 /*
1542 * If something goes pear shaped
1543 * initialising the new algo,
1544 * fall back to newreno (which
1545 * does not require initialisation).
1546 */
1547 if (algo->cb_init != NULL)
1548 if (algo->cb_init(tp->ccv) > 0) {
1549 CC_ALGO(tp) = &newreno_cc_algo;
1550 /*
1551 * The only reason init
1552 * should fail is
1553 * because of malloc.
1554 */
1555 error = ENOMEM;
1556 }
1557 break; /* Break the STAILQ_FOREACH. */
1558 }
1559 }
1560 CC_LIST_RUNLOCK();
1561 goto unlock_and_done;
1562
1563 case TCP_KEEPIDLE:
1564 case TCP_KEEPINTVL:
1565 case TCP_KEEPINIT:
1566 INP_WUNLOCK(inp);
1567 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
1568 if (error)
1569 return (error);
1570
1571 if (ui > (UINT_MAX / hz)) {
1572 error = EINVAL;
1573 break;
1574 }
1575 ui *= hz;
1576
1577 INP_WLOCK_RECHECK(inp);
1578 switch (sopt->sopt_name) {
1579 case TCP_KEEPIDLE:
1580 tp->t_keepidle = ui;
1581 /*
1582 * XXX: better check current remaining
1583 * timeout and "merge" it with new value.
1584 */
1585 if ((tp->t_state > TCPS_LISTEN) &&
1586 (tp->t_state <= TCPS_CLOSING))
1587 tcp_timer_activate(tp, TT_KEEP,
1588 TP_KEEPIDLE(tp));
1589 break;
1590 case TCP_KEEPINTVL:
1591 tp->t_keepintvl = ui;
1592 if ((tp->t_state == TCPS_FIN_WAIT_2) &&
1593 (TP_MAXIDLE(tp) > 0))
1594 tcp_timer_activate(tp, TT_2MSL,
1595 TP_MAXIDLE(tp));
1596 break;
1597 case TCP_KEEPINIT:
1598 tp->t_keepinit = ui;
1599 if (tp->t_state == TCPS_SYN_RECEIVED ||
1600 tp->t_state == TCPS_SYN_SENT)
1601 tcp_timer_activate(tp, TT_KEEP,
1602 TP_KEEPINIT(tp));
1603 break;
1604 }
1605 goto unlock_and_done;
1606
1607 case TCP_KEEPCNT:
1608 INP_WUNLOCK(inp);
1609 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
1610 if (error)
1611 return (error);
1612
1613 INP_WLOCK_RECHECK(inp);
1614 tp->t_keepcnt = ui;
1615 if ((tp->t_state == TCPS_FIN_WAIT_2) &&
1616 (TP_MAXIDLE(tp) > 0))
1617 tcp_timer_activate(tp, TT_2MSL,
1618 TP_MAXIDLE(tp));
1619 goto unlock_and_done;
1620
1621 #ifdef TCP_RFC7413
1622 case TCP_FASTOPEN:
1623 INP_WUNLOCK(inp);
1624 if (!V_tcp_fastopen_enabled)
1625 return (EPERM);
1626
1627 error = sooptcopyin(sopt, &optval, sizeof optval,
1628 sizeof optval);
1629 if (error)
1630 return (error);
1631
1632 INP_WLOCK_RECHECK(inp);
1633 if (optval) {
1634 tp->t_flags |= TF_FASTOPEN;
1635 if ((tp->t_state == TCPS_LISTEN) &&
1636 (tp->t_tfo_pending == NULL))
1637 tp->t_tfo_pending =
1638 tcp_fastopen_alloc_counter();
1639 } else
1640 tp->t_flags &= ~TF_FASTOPEN;
1641 goto unlock_and_done;
1642 #endif
1643
1644 default:
1645 INP_WUNLOCK(inp);
1646 error = ENOPROTOOPT;
1647 break;
1648 }
1649 break;
1650
1651 case SOPT_GET:
1652 tp = intotcpcb(inp);
1653 switch (sopt->sopt_name) {
1654 #ifdef TCP_SIGNATURE
1655 case TCP_MD5SIG:
1656 optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0;
1657 INP_WUNLOCK(inp);
1658 error = sooptcopyout(sopt, &optval, sizeof optval);
1659 break;
1660 #endif
1661
1662 case TCP_NODELAY:
1663 optval = tp->t_flags & TF_NODELAY;
1664 INP_WUNLOCK(inp);
1665 error = sooptcopyout(sopt, &optval, sizeof optval);
1666 break;
1667 case TCP_MAXSEG:
1668 optval = tp->t_maxseg;
1669 INP_WUNLOCK(inp);
1670 error = sooptcopyout(sopt, &optval, sizeof optval);
1671 break;
1672 case TCP_NOOPT:
1673 optval = tp->t_flags & TF_NOOPT;
1674 INP_WUNLOCK(inp);
1675 error = sooptcopyout(sopt, &optval, sizeof optval);
1676 break;
1677 case TCP_NOPUSH:
1678 optval = tp->t_flags & TF_NOPUSH;
1679 INP_WUNLOCK(inp);
1680 error = sooptcopyout(sopt, &optval, sizeof optval);
1681 break;
1682 case TCP_INFO:
1683 tcp_fill_info(tp, &ti);
1684 INP_WUNLOCK(inp);
1685 error = sooptcopyout(sopt, &ti, sizeof ti);
1686 break;
1687 case TCP_CONGESTION:
1688 bzero(buf, sizeof(buf));
1689 strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX);
1690 INP_WUNLOCK(inp);
1691 error = sooptcopyout(sopt, buf, TCP_CA_NAME_MAX);
1692 break;
1693 case TCP_KEEPIDLE:
1694 case TCP_KEEPINTVL:
1695 case TCP_KEEPINIT:
1696 case TCP_KEEPCNT:
1697 switch (sopt->sopt_name) {
1698 case TCP_KEEPIDLE:
1699 ui = tp->t_keepidle / hz;
1700 break;
1701 case TCP_KEEPINTVL:
1702 ui = tp->t_keepintvl / hz;
1703 break;
1704 case TCP_KEEPINIT:
1705 ui = tp->t_keepinit / hz;
1706 break;
1707 case TCP_KEEPCNT:
1708 ui = tp->t_keepcnt;
1709 break;
1710 }
1711 INP_WUNLOCK(inp);
1712 error = sooptcopyout(sopt, &ui, sizeof(ui));
1713 break;
1714 #ifdef TCP_RFC7413
1715 case TCP_FASTOPEN:
1716 optval = tp->t_flags & TF_FASTOPEN;
1717 INP_WUNLOCK(inp);
1718 error = sooptcopyout(sopt, &optval, sizeof optval);
1719 break;
1720 #endif
1721 default:
1722 INP_WUNLOCK(inp);
1723 error = ENOPROTOOPT;
1724 break;
1725 }
1726 break;
1727 }
1728 return (error);
1729 }
1730 #undef INP_WLOCK_RECHECK
1731
1732 /*
1733 * Attach TCP protocol to socket, allocating
1734 * internet protocol control block, tcp control block,
1735 * bufer space, and entering LISTEN state if to accept connections.
1736 */
1737 static int
1738 tcp_attach(struct socket *so)
1739 {
1740 struct tcpcb *tp;
1741 struct inpcb *inp;
1742 int error;
1743
1744 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1745 error = soreserve(so, V_tcp_sendspace, V_tcp_recvspace);
1746 if (error)
1747 return (error);
1748 }
1749 so->so_rcv.sb_flags |= SB_AUTOSIZE;
1750 so->so_snd.sb_flags |= SB_AUTOSIZE;
1751 INP_INFO_RLOCK(&V_tcbinfo);
1752 error = in_pcballoc(so, &V_tcbinfo);
1753 if (error) {
1754 INP_INFO_RUNLOCK(&V_tcbinfo);
1755 return (error);
1756 }
1757 inp = sotoinpcb(so);
1758 #ifdef INET6
1759 if (inp->inp_vflag & INP_IPV6PROTO) {
1760 inp->inp_vflag |= INP_IPV6;
1761 inp->in6p_hops = -1; /* use kernel default */
1762 }
1763 else
1764 #endif
1765 inp->inp_vflag |= INP_IPV4;
1766 tp = tcp_newtcpcb(inp);
1767 if (tp == NULL) {
1768 in_pcbdetach(inp);
1769 in_pcbfree(inp);
1770 INP_INFO_RUNLOCK(&V_tcbinfo);
1771 return (ENOBUFS);
1772 }
1773 tp->t_state = TCPS_CLOSED;
1774 INP_WUNLOCK(inp);
1775 INP_INFO_RUNLOCK(&V_tcbinfo);
1776 return (0);
1777 }
1778
1779 /*
1780 * Initiate (or continue) disconnect.
1781 * If embryonic state, just send reset (once).
1782 * If in ``let data drain'' option and linger null, just drop.
1783 * Otherwise (hard), mark socket disconnecting and drop
1784 * current input data; switch states based on user close, and
1785 * send segment to peer (with FIN).
1786 */
1787 static void
1788 tcp_disconnect(struct tcpcb *tp)
1789 {
1790 struct inpcb *inp = tp->t_inpcb;
1791 struct socket *so = inp->inp_socket;
1792
1793 INP_INFO_RLOCK_ASSERT(&V_tcbinfo);
1794 INP_WLOCK_ASSERT(inp);
1795
1796 /*
1797 * Neither tcp_close() nor tcp_drop() should return NULL, as the
1798 * socket is still open.
1799 */
1800 if (tp->t_state < TCPS_ESTABLISHED) {
1801 tp = tcp_close(tp);
1802 KASSERT(tp != NULL,
1803 ("tcp_disconnect: tcp_close() returned NULL"));
1804 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
1805 tp = tcp_drop(tp, 0);
1806 KASSERT(tp != NULL,
1807 ("tcp_disconnect: tcp_drop() returned NULL"));
1808 } else {
1809 soisdisconnecting(so);
1810 sbflush(&so->so_rcv);
1811 tcp_usrclosed(tp);
1812 if (!(inp->inp_flags & INP_DROPPED))
1813 tcp_output(tp);
1814 }
1815 }
1816
1817 /*
1818 * User issued close, and wish to trail through shutdown states:
1819 * if never received SYN, just forget it. If got a SYN from peer,
1820 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
1821 * If already got a FIN from peer, then almost done; go to LAST_ACK
1822 * state. In all other cases, have already sent FIN to peer (e.g.
1823 * after PRU_SHUTDOWN), and just have to play tedious game waiting
1824 * for peer to send FIN or not respond to keep-alives, etc.
1825 * We can let the user exit from the close as soon as the FIN is acked.
1826 */
1827 static void
1828 tcp_usrclosed(struct tcpcb *tp)
1829 {
1830
1831 INP_INFO_RLOCK_ASSERT(&V_tcbinfo);
1832 INP_WLOCK_ASSERT(tp->t_inpcb);
1833
1834 switch (tp->t_state) {
1835 case TCPS_LISTEN:
1836 #ifdef TCP_OFFLOAD
1837 tcp_offload_listen_stop(tp);
1838 #endif
1839 tcp_state_change(tp, TCPS_CLOSED);
1840 /* FALLTHROUGH */
1841 case TCPS_CLOSED:
1842 tp = tcp_close(tp);
1843 /*
1844 * tcp_close() should never return NULL here as the socket is
1845 * still open.
1846 */
1847 KASSERT(tp != NULL,
1848 ("tcp_usrclosed: tcp_close() returned NULL"));
1849 break;
1850
1851 case TCPS_SYN_SENT:
1852 case TCPS_SYN_RECEIVED:
1853 tp->t_flags |= TF_NEEDFIN;
1854 break;
1855
1856 case TCPS_ESTABLISHED:
1857 tcp_state_change(tp, TCPS_FIN_WAIT_1);
1858 break;
1859
1860 case TCPS_CLOSE_WAIT:
1861 tcp_state_change(tp, TCPS_LAST_ACK);
1862 break;
1863 }
1864 if (tp->t_state >= TCPS_FIN_WAIT_2) {
1865 soisdisconnected(tp->t_inpcb->inp_socket);
1866 /* Prevent the connection hanging in FIN_WAIT_2 forever. */
1867 if (tp->t_state == TCPS_FIN_WAIT_2) {
1868 int timeout;
1869
1870 timeout = (tcp_fast_finwait2_recycle) ?
1871 tcp_finwait2_timeout : TP_MAXIDLE(tp);
1872 tcp_timer_activate(tp, TT_2MSL, timeout);
1873 }
1874 }
1875 }
1876
1877 #ifdef DDB
1878 static void
1879 db_print_indent(int indent)
1880 {
1881 int i;
1882
1883 for (i = 0; i < indent; i++)
1884 db_printf(" ");
1885 }
1886
1887 static void
1888 db_print_tstate(int t_state)
1889 {
1890
1891 switch (t_state) {
1892 case TCPS_CLOSED:
1893 db_printf("TCPS_CLOSED");
1894 return;
1895
1896 case TCPS_LISTEN:
1897 db_printf("TCPS_LISTEN");
1898 return;
1899
1900 case TCPS_SYN_SENT:
1901 db_printf("TCPS_SYN_SENT");
1902 return;
1903
1904 case TCPS_SYN_RECEIVED:
1905 db_printf("TCPS_SYN_RECEIVED");
1906 return;
1907
1908 case TCPS_ESTABLISHED:
1909 db_printf("TCPS_ESTABLISHED");
1910 return;
1911
1912 case TCPS_CLOSE_WAIT:
1913 db_printf("TCPS_CLOSE_WAIT");
1914 return;
1915
1916 case TCPS_FIN_WAIT_1:
1917 db_printf("TCPS_FIN_WAIT_1");
1918 return;
1919
1920 case TCPS_CLOSING:
1921 db_printf("TCPS_CLOSING");
1922 return;
1923
1924 case TCPS_LAST_ACK:
1925 db_printf("TCPS_LAST_ACK");
1926 return;
1927
1928 case TCPS_FIN_WAIT_2:
1929 db_printf("TCPS_FIN_WAIT_2");
1930 return;
1931
1932 case TCPS_TIME_WAIT:
1933 db_printf("TCPS_TIME_WAIT");
1934 return;
1935
1936 default:
1937 db_printf("unknown");
1938 return;
1939 }
1940 }
1941
1942 static void
1943 db_print_tflags(u_int t_flags)
1944 {
1945 int comma;
1946
1947 comma = 0;
1948 if (t_flags & TF_ACKNOW) {
1949 db_printf("%sTF_ACKNOW", comma ? ", " : "");
1950 comma = 1;
1951 }
1952 if (t_flags & TF_DELACK) {
1953 db_printf("%sTF_DELACK", comma ? ", " : "");
1954 comma = 1;
1955 }
1956 if (t_flags & TF_NODELAY) {
1957 db_printf("%sTF_NODELAY", comma ? ", " : "");
1958 comma = 1;
1959 }
1960 if (t_flags & TF_NOOPT) {
1961 db_printf("%sTF_NOOPT", comma ? ", " : "");
1962 comma = 1;
1963 }
1964 if (t_flags & TF_SENTFIN) {
1965 db_printf("%sTF_SENTFIN", comma ? ", " : "");
1966 comma = 1;
1967 }
1968 if (t_flags & TF_REQ_SCALE) {
1969 db_printf("%sTF_REQ_SCALE", comma ? ", " : "");
1970 comma = 1;
1971 }
1972 if (t_flags & TF_RCVD_SCALE) {
1973 db_printf("%sTF_RECVD_SCALE", comma ? ", " : "");
1974 comma = 1;
1975 }
1976 if (t_flags & TF_REQ_TSTMP) {
1977 db_printf("%sTF_REQ_TSTMP", comma ? ", " : "");
1978 comma = 1;
1979 }
1980 if (t_flags & TF_RCVD_TSTMP) {
1981 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : "");
1982 comma = 1;
1983 }
1984 if (t_flags & TF_SACK_PERMIT) {
1985 db_printf("%sTF_SACK_PERMIT", comma ? ", " : "");
1986 comma = 1;
1987 }
1988 if (t_flags & TF_NEEDSYN) {
1989 db_printf("%sTF_NEEDSYN", comma ? ", " : "");
1990 comma = 1;
1991 }
1992 if (t_flags & TF_NEEDFIN) {
1993 db_printf("%sTF_NEEDFIN", comma ? ", " : "");
1994 comma = 1;
1995 }
1996 if (t_flags & TF_NOPUSH) {
1997 db_printf("%sTF_NOPUSH", comma ? ", " : "");
1998 comma = 1;
1999 }
2000 if (t_flags & TF_MORETOCOME) {
2001 db_printf("%sTF_MORETOCOME", comma ? ", " : "");
2002 comma = 1;
2003 }
2004 if (t_flags & TF_LQ_OVERFLOW) {
2005 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : "");
2006 comma = 1;
2007 }
2008 if (t_flags & TF_LASTIDLE) {
2009 db_printf("%sTF_LASTIDLE", comma ? ", " : "");
2010 comma = 1;
2011 }
2012 if (t_flags & TF_RXWIN0SENT) {
2013 db_printf("%sTF_RXWIN0SENT", comma ? ", " : "");
2014 comma = 1;
2015 }
2016 if (t_flags & TF_FASTRECOVERY) {
2017 db_printf("%sTF_FASTRECOVERY", comma ? ", " : "");
2018 comma = 1;
2019 }
2020 if (t_flags & TF_CONGRECOVERY) {
2021 db_printf("%sTF_CONGRECOVERY", comma ? ", " : "");
2022 comma = 1;
2023 }
2024 if (t_flags & TF_WASFRECOVERY) {
2025 db_printf("%sTF_WASFRECOVERY", comma ? ", " : "");
2026 comma = 1;
2027 }
2028 if (t_flags & TF_SIGNATURE) {
2029 db_printf("%sTF_SIGNATURE", comma ? ", " : "");
2030 comma = 1;
2031 }
2032 if (t_flags & TF_FORCEDATA) {
2033 db_printf("%sTF_FORCEDATA", comma ? ", " : "");
2034 comma = 1;
2035 }
2036 if (t_flags & TF_TSO) {
2037 db_printf("%sTF_TSO", comma ? ", " : "");
2038 comma = 1;
2039 }
2040 if (t_flags & TF_ECN_PERMIT) {
2041 db_printf("%sTF_ECN_PERMIT", comma ? ", " : "");
2042 comma = 1;
2043 }
2044 if (t_flags & TF_FASTOPEN) {
2045 db_printf("%sTF_FASTOPEN", comma ? ", " : "");
2046 comma = 1;
2047 }
2048 }
2049
2050 static void
2051 db_print_toobflags(char t_oobflags)
2052 {
2053 int comma;
2054
2055 comma = 0;
2056 if (t_oobflags & TCPOOB_HAVEDATA) {
2057 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : "");
2058 comma = 1;
2059 }
2060 if (t_oobflags & TCPOOB_HADDATA) {
2061 db_printf("%sTCPOOB_HADDATA", comma ? ", " : "");
2062 comma = 1;
2063 }
2064 }
2065
2066 static void
2067 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent)
2068 {
2069
2070 db_print_indent(indent);
2071 db_printf("%s at %p\n", name, tp);
2072
2073 indent += 2;
2074
2075 db_print_indent(indent);
2076 db_printf("t_segq first: %p t_segqlen: %d t_dupacks: %d\n",
2077 LIST_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks);
2078
2079 db_print_indent(indent);
2080 db_printf("tt_rexmt: %p tt_persist: %p tt_keep: %p\n",
2081 &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep);
2082
2083 db_print_indent(indent);
2084 db_printf("tt_2msl: %p tt_delack: %p t_inpcb: %p\n", &tp->t_timers->tt_2msl,
2085 &tp->t_timers->tt_delack, tp->t_inpcb);
2086
2087 db_print_indent(indent);
2088 db_printf("t_state: %d (", tp->t_state);
2089 db_print_tstate(tp->t_state);
2090 db_printf(")\n");
2091
2092 db_print_indent(indent);
2093 db_printf("t_flags: 0x%x (", tp->t_flags);
2094 db_print_tflags(tp->t_flags);
2095 db_printf(")\n");
2096
2097 db_print_indent(indent);
2098 db_printf("snd_una: 0x%08x snd_max: 0x%08x snd_nxt: x0%08x\n",
2099 tp->snd_una, tp->snd_max, tp->snd_nxt);
2100
2101 db_print_indent(indent);
2102 db_printf("snd_up: 0x%08x snd_wl1: 0x%08x snd_wl2: 0x%08x\n",
2103 tp->snd_up, tp->snd_wl1, tp->snd_wl2);
2104
2105 db_print_indent(indent);
2106 db_printf("iss: 0x%08x irs: 0x%08x rcv_nxt: 0x%08x\n",
2107 tp->iss, tp->irs, tp->rcv_nxt);
2108
2109 db_print_indent(indent);
2110 db_printf("rcv_adv: 0x%08x rcv_wnd: %lu rcv_up: 0x%08x\n",
2111 tp->rcv_adv, tp->rcv_wnd, tp->rcv_up);
2112
2113 db_print_indent(indent);
2114 db_printf("snd_wnd: %lu snd_cwnd: %lu\n",
2115 tp->snd_wnd, tp->snd_cwnd);
2116
2117 db_print_indent(indent);
2118 db_printf("snd_ssthresh: %lu snd_recover: "
2119 "0x%08x\n", tp->snd_ssthresh, tp->snd_recover);
2120
2121 db_print_indent(indent);
2122 db_printf("t_maxopd: %u t_rcvtime: %u t_startime: %u\n",
2123 tp->t_maxopd, tp->t_rcvtime, tp->t_starttime);
2124
2125 db_print_indent(indent);
2126 db_printf("t_rttime: %u t_rtsq: 0x%08x\n",
2127 tp->t_rtttime, tp->t_rtseq);
2128
2129 db_print_indent(indent);
2130 db_printf("t_rxtcur: %d t_maxseg: %u t_srtt: %d\n",
2131 tp->t_rxtcur, tp->t_maxseg, tp->t_srtt);
2132
2133 db_print_indent(indent);
2134 db_printf("t_rttvar: %d t_rxtshift: %d t_rttmin: %u "
2135 "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin,
2136 tp->t_rttbest);
2137
2138 db_print_indent(indent);
2139 db_printf("t_rttupdated: %lu max_sndwnd: %lu t_softerror: %d\n",
2140 tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror);
2141
2142 db_print_indent(indent);
2143 db_printf("t_oobflags: 0x%x (", tp->t_oobflags);
2144 db_print_toobflags(tp->t_oobflags);
2145 db_printf(") t_iobc: 0x%02x\n", tp->t_iobc);
2146
2147 db_print_indent(indent);
2148 db_printf("snd_scale: %u rcv_scale: %u request_r_scale: %u\n",
2149 tp->snd_scale, tp->rcv_scale, tp->request_r_scale);
2150
2151 db_print_indent(indent);
2152 db_printf("ts_recent: %u ts_recent_age: %u\n",
2153 tp->ts_recent, tp->ts_recent_age);
2154
2155 db_print_indent(indent);
2156 db_printf("ts_offset: %u last_ack_sent: 0x%08x snd_cwnd_prev: "
2157 "%lu\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev);
2158
2159 db_print_indent(indent);
2160 db_printf("snd_ssthresh_prev: %lu snd_recover_prev: 0x%08x "
2161 "t_badrxtwin: %u\n", tp->snd_ssthresh_prev,
2162 tp->snd_recover_prev, tp->t_badrxtwin);
2163
2164 db_print_indent(indent);
2165 db_printf("snd_numholes: %d snd_holes first: %p\n",
2166 tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes));
2167
2168 db_print_indent(indent);
2169 db_printf("snd_fack: 0x%08x rcv_numsacks: %d sack_newdata: "
2170 "0x%08x\n", tp->snd_fack, tp->rcv_numsacks, tp->sack_newdata);
2171
2172 /* Skip sackblks, sackhint. */
2173
2174 db_print_indent(indent);
2175 db_printf("t_rttlow: %d rfbuf_ts: %u rfbuf_cnt: %d\n",
2176 tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt);
2177 }
2178
2179 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb)
2180 {
2181 struct tcpcb *tp;
2182
2183 if (!have_addr) {
2184 db_printf("usage: show tcpcb <addr>\n");
2185 return;
2186 }
2187 tp = (struct tcpcb *)addr;
2188
2189 db_print_tcpcb(tp, "tcpcb", 0);
2190 }
2191 #endif
Cache object: 07268fe98739bbba8a59b97931bb5b53
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