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/8.3/sys/netinet/tcp_usrreq.c 231097 2012-02-06 18:47:07Z np $");
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/cc.h>
66 #include <netinet/in.h>
67 #include <netinet/in_systm.h>
68 #ifdef INET6
69 #include <netinet/ip6.h>
70 #endif
71 #include <netinet/in_pcb.h>
72 #ifdef INET6
73 #include <netinet6/in6_pcb.h>
74 #endif
75 #include <netinet/in_var.h>
76 #include <netinet/ip_var.h>
77 #ifdef INET6
78 #include <netinet6/ip6_var.h>
79 #include <netinet6/scope6_var.h>
80 #endif
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 INP_WUNLOCK(inp);
208 }
209 }
210 }
211
212 /*
213 * pru_detach() detaches the TCP protocol from the socket.
214 * If the protocol state is non-embryonic, then can't
215 * do this directly: have to initiate a pru_disconnect(),
216 * which may finish later; embryonic TCB's can just
217 * be discarded here.
218 */
219 static void
220 tcp_usr_detach(struct socket *so)
221 {
222 struct inpcb *inp;
223
224 inp = sotoinpcb(so);
225 KASSERT(inp != NULL, ("tcp_usr_detach: inp == NULL"));
226 INP_INFO_WLOCK(&V_tcbinfo);
227 INP_WLOCK(inp);
228 KASSERT(inp->inp_socket != NULL,
229 ("tcp_usr_detach: inp_socket == NULL"));
230 tcp_detach(so, inp);
231 INP_INFO_WUNLOCK(&V_tcbinfo);
232 }
233
234 /*
235 * Give the socket an address.
236 */
237 static int
238 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
239 {
240 int error = 0;
241 struct inpcb *inp;
242 struct tcpcb *tp = NULL;
243 struct sockaddr_in *sinp;
244
245 sinp = (struct sockaddr_in *)nam;
246 if (nam->sa_len != sizeof (*sinp))
247 return (EINVAL);
248 /*
249 * Must check for multicast addresses and disallow binding
250 * to them.
251 */
252 if (sinp->sin_family == AF_INET &&
253 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
254 return (EAFNOSUPPORT);
255
256 TCPDEBUG0;
257 INP_INFO_WLOCK(&V_tcbinfo);
258 inp = sotoinpcb(so);
259 KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL"));
260 INP_WLOCK(inp);
261 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
262 error = EINVAL;
263 goto out;
264 }
265 tp = intotcpcb(inp);
266 TCPDEBUG1();
267 error = in_pcbbind(inp, nam, td->td_ucred);
268 out:
269 TCPDEBUG2(PRU_BIND);
270 INP_WUNLOCK(inp);
271 INP_INFO_WUNLOCK(&V_tcbinfo);
272
273 return (error);
274 }
275
276 #ifdef INET6
277 static int
278 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
279 {
280 int error = 0;
281 struct inpcb *inp;
282 struct tcpcb *tp = NULL;
283 struct sockaddr_in6 *sin6p;
284
285 sin6p = (struct sockaddr_in6 *)nam;
286 if (nam->sa_len != sizeof (*sin6p))
287 return (EINVAL);
288 /*
289 * Must check for multicast addresses and disallow binding
290 * to them.
291 */
292 if (sin6p->sin6_family == AF_INET6 &&
293 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr))
294 return (EAFNOSUPPORT);
295
296 TCPDEBUG0;
297 INP_INFO_WLOCK(&V_tcbinfo);
298 inp = sotoinpcb(so);
299 KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL"));
300 INP_WLOCK(inp);
301 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
302 error = EINVAL;
303 goto out;
304 }
305 tp = intotcpcb(inp);
306 TCPDEBUG1();
307 inp->inp_vflag &= ~INP_IPV4;
308 inp->inp_vflag |= INP_IPV6;
309 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
310 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr))
311 inp->inp_vflag |= INP_IPV4;
312 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
313 struct sockaddr_in sin;
314
315 in6_sin6_2_sin(&sin, sin6p);
316 inp->inp_vflag |= INP_IPV4;
317 inp->inp_vflag &= ~INP_IPV6;
318 error = in_pcbbind(inp, (struct sockaddr *)&sin,
319 td->td_ucred);
320 goto out;
321 }
322 }
323 error = in6_pcbbind(inp, nam, td->td_ucred);
324 out:
325 TCPDEBUG2(PRU_BIND);
326 INP_WUNLOCK(inp);
327 INP_INFO_WUNLOCK(&V_tcbinfo);
328 return (error);
329 }
330 #endif /* INET6 */
331
332 /*
333 * Prepare to accept connections.
334 */
335 static int
336 tcp_usr_listen(struct socket *so, int backlog, struct thread *td)
337 {
338 int error = 0;
339 struct inpcb *inp;
340 struct tcpcb *tp = NULL;
341
342 TCPDEBUG0;
343 INP_INFO_WLOCK(&V_tcbinfo);
344 inp = sotoinpcb(so);
345 KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL"));
346 INP_WLOCK(inp);
347 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
348 error = EINVAL;
349 goto out;
350 }
351 tp = intotcpcb(inp);
352 TCPDEBUG1();
353 SOCK_LOCK(so);
354 error = solisten_proto_check(so);
355 if (error == 0 && inp->inp_lport == 0)
356 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
357 if (error == 0) {
358 tp->t_state = TCPS_LISTEN;
359 solisten_proto(so, backlog);
360 tcp_offload_listen_open(tp);
361 }
362 SOCK_UNLOCK(so);
363
364 out:
365 TCPDEBUG2(PRU_LISTEN);
366 INP_WUNLOCK(inp);
367 INP_INFO_WUNLOCK(&V_tcbinfo);
368 return (error);
369 }
370
371 #ifdef INET6
372 static int
373 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td)
374 {
375 int error = 0;
376 struct inpcb *inp;
377 struct tcpcb *tp = NULL;
378
379 TCPDEBUG0;
380 INP_INFO_WLOCK(&V_tcbinfo);
381 inp = sotoinpcb(so);
382 KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL"));
383 INP_WLOCK(inp);
384 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
385 error = EINVAL;
386 goto out;
387 }
388 tp = intotcpcb(inp);
389 TCPDEBUG1();
390 SOCK_LOCK(so);
391 error = solisten_proto_check(so);
392 if (error == 0 && inp->inp_lport == 0) {
393 inp->inp_vflag &= ~INP_IPV4;
394 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
395 inp->inp_vflag |= INP_IPV4;
396 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
397 }
398 if (error == 0) {
399 tp->t_state = TCPS_LISTEN;
400 solisten_proto(so, backlog);
401 }
402 SOCK_UNLOCK(so);
403
404 out:
405 TCPDEBUG2(PRU_LISTEN);
406 INP_WUNLOCK(inp);
407 INP_INFO_WUNLOCK(&V_tcbinfo);
408 return (error);
409 }
410 #endif /* INET6 */
411
412 /*
413 * Initiate connection to peer.
414 * Create a template for use in transmissions on this connection.
415 * Enter SYN_SENT state, and mark socket as connecting.
416 * Start keep-alive timer, and seed output sequence space.
417 * Send initial segment on connection.
418 */
419 static int
420 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
421 {
422 int error = 0;
423 struct inpcb *inp;
424 struct tcpcb *tp = NULL;
425 struct sockaddr_in *sinp;
426
427 sinp = (struct sockaddr_in *)nam;
428 if (nam->sa_len != sizeof (*sinp))
429 return (EINVAL);
430 /*
431 * Must disallow TCP ``connections'' to multicast addresses.
432 */
433 if (sinp->sin_family == AF_INET
434 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
435 return (EAFNOSUPPORT);
436 if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0)
437 return (error);
438
439 TCPDEBUG0;
440 INP_INFO_WLOCK(&V_tcbinfo);
441 inp = sotoinpcb(so);
442 KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL"));
443 INP_WLOCK(inp);
444 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
445 error = EINVAL;
446 goto out;
447 }
448 tp = intotcpcb(inp);
449 TCPDEBUG1();
450 if ((error = tcp_connect(tp, nam, td)) != 0)
451 goto out;
452 error = tcp_output_connect(so, nam);
453 out:
454 TCPDEBUG2(PRU_CONNECT);
455 INP_WUNLOCK(inp);
456 INP_INFO_WUNLOCK(&V_tcbinfo);
457 return (error);
458 }
459
460 #ifdef INET6
461 static int
462 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
463 {
464 int error = 0;
465 struct inpcb *inp;
466 struct tcpcb *tp = NULL;
467 struct sockaddr_in6 *sin6p;
468
469 TCPDEBUG0;
470
471 sin6p = (struct sockaddr_in6 *)nam;
472 if (nam->sa_len != sizeof (*sin6p))
473 return (EINVAL);
474 /*
475 * Must disallow TCP ``connections'' to multicast addresses.
476 */
477 if (sin6p->sin6_family == AF_INET6
478 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr))
479 return (EAFNOSUPPORT);
480
481 INP_INFO_WLOCK(&V_tcbinfo);
482 inp = sotoinpcb(so);
483 KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL"));
484 INP_WLOCK(inp);
485 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
486 error = EINVAL;
487 goto out;
488 }
489 tp = intotcpcb(inp);
490 TCPDEBUG1();
491 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
492 struct sockaddr_in sin;
493
494 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
495 error = EINVAL;
496 goto out;
497 }
498
499 in6_sin6_2_sin(&sin, sin6p);
500 inp->inp_vflag |= INP_IPV4;
501 inp->inp_vflag &= ~INP_IPV6;
502 if ((error = prison_remote_ip4(td->td_ucred,
503 &sin.sin_addr)) != 0)
504 goto out;
505 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0)
506 goto out;
507 error = tcp_output_connect(so, nam);
508 goto out;
509 }
510 inp->inp_vflag &= ~INP_IPV4;
511 inp->inp_vflag |= INP_IPV6;
512 inp->inp_inc.inc_flags |= INC_ISIPV6;
513 if ((error = prison_remote_ip6(td->td_ucred, &sin6p->sin6_addr)) != 0)
514 goto out;
515 if ((error = tcp6_connect(tp, nam, td)) != 0)
516 goto out;
517 error = tcp_output_connect(so, nam);
518
519 out:
520 TCPDEBUG2(PRU_CONNECT);
521 INP_WUNLOCK(inp);
522 INP_INFO_WUNLOCK(&V_tcbinfo);
523 return (error);
524 }
525 #endif /* INET6 */
526
527 /*
528 * Initiate disconnect from peer.
529 * If connection never passed embryonic stage, just drop;
530 * else if don't need to let data drain, then can just drop anyways,
531 * else have to begin TCP shutdown process: mark socket disconnecting,
532 * drain unread data, state switch to reflect user close, and
533 * send segment (e.g. FIN) to peer. Socket will be really disconnected
534 * when peer sends FIN and acks ours.
535 *
536 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
537 */
538 static int
539 tcp_usr_disconnect(struct socket *so)
540 {
541 struct inpcb *inp;
542 struct tcpcb *tp = NULL;
543 int error = 0;
544
545 TCPDEBUG0;
546 INP_INFO_WLOCK(&V_tcbinfo);
547 inp = sotoinpcb(so);
548 KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL"));
549 INP_WLOCK(inp);
550 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
551 error = ECONNRESET;
552 goto out;
553 }
554 tp = intotcpcb(inp);
555 TCPDEBUG1();
556 tcp_disconnect(tp);
557 out:
558 TCPDEBUG2(PRU_DISCONNECT);
559 INP_WUNLOCK(inp);
560 INP_INFO_WUNLOCK(&V_tcbinfo);
561 return (error);
562 }
563
564 /*
565 * Accept a connection. Essentially all the work is done at higher levels;
566 * just return the address of the peer, storing through addr.
567 *
568 * The rationale for acquiring the tcbinfo lock here is somewhat complicated,
569 * and is described in detail in the commit log entry for r175612. Acquiring
570 * it delays an accept(2) racing with sonewconn(), which inserts the socket
571 * before the inpcb address/port fields are initialized. A better fix would
572 * prevent the socket from being placed in the listen queue until all fields
573 * are fully initialized.
574 */
575 static int
576 tcp_usr_accept(struct socket *so, struct sockaddr **nam)
577 {
578 int error = 0;
579 struct inpcb *inp = NULL;
580 struct tcpcb *tp = NULL;
581 struct in_addr addr;
582 in_port_t port = 0;
583 TCPDEBUG0;
584
585 if (so->so_state & SS_ISDISCONNECTED)
586 return (ECONNABORTED);
587
588 inp = sotoinpcb(so);
589 KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL"));
590 INP_INFO_RLOCK(&V_tcbinfo);
591 INP_WLOCK(inp);
592 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
593 error = ECONNABORTED;
594 goto out;
595 }
596 tp = intotcpcb(inp);
597 TCPDEBUG1();
598
599 /*
600 * We inline in_getpeeraddr and COMMON_END here, so that we can
601 * copy the data of interest and defer the malloc until after we
602 * release the lock.
603 */
604 port = inp->inp_fport;
605 addr = inp->inp_faddr;
606
607 out:
608 TCPDEBUG2(PRU_ACCEPT);
609 INP_WUNLOCK(inp);
610 INP_INFO_RUNLOCK(&V_tcbinfo);
611 if (error == 0)
612 *nam = in_sockaddr(port, &addr);
613 return error;
614 }
615
616 #ifdef INET6
617 static int
618 tcp6_usr_accept(struct socket *so, struct sockaddr **nam)
619 {
620 struct inpcb *inp = NULL;
621 int error = 0;
622 struct tcpcb *tp = NULL;
623 struct in_addr addr;
624 struct in6_addr addr6;
625 in_port_t port = 0;
626 int v4 = 0;
627 TCPDEBUG0;
628
629 if (so->so_state & SS_ISDISCONNECTED)
630 return (ECONNABORTED);
631
632 inp = sotoinpcb(so);
633 KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL"));
634 INP_WLOCK(inp);
635 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
636 error = ECONNABORTED;
637 goto out;
638 }
639 tp = intotcpcb(inp);
640 TCPDEBUG1();
641
642 /*
643 * We inline in6_mapped_peeraddr and COMMON_END here, so that we can
644 * copy the data of interest and defer the malloc until after we
645 * release the lock.
646 */
647 if (inp->inp_vflag & INP_IPV4) {
648 v4 = 1;
649 port = inp->inp_fport;
650 addr = inp->inp_faddr;
651 } else {
652 port = inp->inp_fport;
653 addr6 = inp->in6p_faddr;
654 }
655
656 out:
657 TCPDEBUG2(PRU_ACCEPT);
658 INP_WUNLOCK(inp);
659 if (error == 0) {
660 if (v4)
661 *nam = in6_v4mapsin6_sockaddr(port, &addr);
662 else
663 *nam = in6_sockaddr(port, &addr6);
664 }
665 return error;
666 }
667 #endif /* INET6 */
668
669 /*
670 * Mark the connection as being incapable of further output.
671 */
672 static int
673 tcp_usr_shutdown(struct socket *so)
674 {
675 int error = 0;
676 struct inpcb *inp;
677 struct tcpcb *tp = NULL;
678
679 TCPDEBUG0;
680 INP_INFO_WLOCK(&V_tcbinfo);
681 inp = sotoinpcb(so);
682 KASSERT(inp != NULL, ("inp == NULL"));
683 INP_WLOCK(inp);
684 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
685 error = ECONNRESET;
686 goto out;
687 }
688 tp = intotcpcb(inp);
689 TCPDEBUG1();
690 socantsendmore(so);
691 tcp_usrclosed(tp);
692 if (!(inp->inp_flags & INP_DROPPED))
693 error = tcp_output_disconnect(tp);
694
695 out:
696 TCPDEBUG2(PRU_SHUTDOWN);
697 INP_WUNLOCK(inp);
698 INP_INFO_WUNLOCK(&V_tcbinfo);
699
700 return (error);
701 }
702
703 /*
704 * After a receive, possibly send window update to peer.
705 */
706 static int
707 tcp_usr_rcvd(struct socket *so, int flags)
708 {
709 struct inpcb *inp;
710 struct tcpcb *tp = NULL;
711 int error = 0;
712
713 TCPDEBUG0;
714 inp = sotoinpcb(so);
715 KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL"));
716 INP_WLOCK(inp);
717 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
718 error = ECONNRESET;
719 goto out;
720 }
721 tp = intotcpcb(inp);
722 TCPDEBUG1();
723 tcp_output_rcvd(tp);
724
725 out:
726 TCPDEBUG2(PRU_RCVD);
727 INP_WUNLOCK(inp);
728 return (error);
729 }
730
731 /*
732 * Do a send by putting data in output queue and updating urgent
733 * marker if URG set. Possibly send more data. Unlike the other
734 * pru_*() routines, the mbuf chains are our responsibility. We
735 * must either enqueue them or free them. The other pru_* routines
736 * generally are caller-frees.
737 */
738 static int
739 tcp_usr_send(struct socket *so, int flags, struct mbuf *m,
740 struct sockaddr *nam, struct mbuf *control, struct thread *td)
741 {
742 int error = 0;
743 struct inpcb *inp;
744 struct tcpcb *tp = NULL;
745 int headlocked = 0;
746 #ifdef INET6
747 int isipv6;
748 #endif
749 TCPDEBUG0;
750
751 /*
752 * We require the pcbinfo lock in two cases:
753 *
754 * (1) An implied connect is taking place, which can result in
755 * binding IPs and ports and hence modification of the pcb hash
756 * chains.
757 *
758 * (2) PRUS_EOF is set, resulting in explicit close on the send.
759 */
760 if ((nam != NULL) || (flags & PRUS_EOF)) {
761 INP_INFO_WLOCK(&V_tcbinfo);
762 headlocked = 1;
763 }
764 inp = sotoinpcb(so);
765 KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL"));
766 INP_WLOCK(inp);
767 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
768 if (control)
769 m_freem(control);
770 if (m)
771 m_freem(m);
772 error = ECONNRESET;
773 goto out;
774 }
775 #ifdef INET6
776 isipv6 = nam && nam->sa_family == AF_INET6;
777 #endif /* INET6 */
778 tp = intotcpcb(inp);
779 TCPDEBUG1();
780 if (control) {
781 /* TCP doesn't do control messages (rights, creds, etc) */
782 if (control->m_len) {
783 m_freem(control);
784 if (m)
785 m_freem(m);
786 error = EINVAL;
787 goto out;
788 }
789 m_freem(control); /* empty control, just free it */
790 }
791 if (!(flags & PRUS_OOB)) {
792 sbappendstream(&so->so_snd, m);
793 if (nam && tp->t_state < TCPS_SYN_SENT) {
794 /*
795 * Do implied connect if not yet connected,
796 * initialize window to default value, and
797 * initialize maxseg/maxopd using peer's cached
798 * MSS.
799 */
800 INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
801 #ifdef INET6
802 if (isipv6)
803 error = tcp6_connect(tp, nam, td);
804 else
805 #endif /* INET6 */
806 error = tcp_connect(tp, nam, td);
807 if (error)
808 goto out;
809 tp->snd_wnd = TTCP_CLIENT_SND_WND;
810 tcp_mss(tp, -1);
811 }
812 if (flags & PRUS_EOF) {
813 /*
814 * Close the send side of the connection after
815 * the data is sent.
816 */
817 INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
818 socantsendmore(so);
819 tcp_usrclosed(tp);
820 }
821 if (headlocked) {
822 INP_INFO_WUNLOCK(&V_tcbinfo);
823 headlocked = 0;
824 }
825 if (!(inp->inp_flags & INP_DROPPED)) {
826 if (flags & PRUS_MORETOCOME)
827 tp->t_flags |= TF_MORETOCOME;
828 error = tcp_output_send(tp);
829 if (flags & PRUS_MORETOCOME)
830 tp->t_flags &= ~TF_MORETOCOME;
831 }
832 } else {
833 /*
834 * XXXRW: PRUS_EOF not implemented with PRUS_OOB?
835 */
836 SOCKBUF_LOCK(&so->so_snd);
837 if (sbspace(&so->so_snd) < -512) {
838 SOCKBUF_UNLOCK(&so->so_snd);
839 m_freem(m);
840 error = ENOBUFS;
841 goto out;
842 }
843 /*
844 * According to RFC961 (Assigned Protocols),
845 * the urgent pointer points to the last octet
846 * of urgent data. We continue, however,
847 * to consider it to indicate the first octet
848 * of data past the urgent section.
849 * Otherwise, snd_up should be one lower.
850 */
851 sbappendstream_locked(&so->so_snd, m);
852 SOCKBUF_UNLOCK(&so->so_snd);
853 if (nam && tp->t_state < TCPS_SYN_SENT) {
854 /*
855 * Do implied connect if not yet connected,
856 * initialize window to default value, and
857 * initialize maxseg/maxopd using peer's cached
858 * MSS.
859 */
860 INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
861 #ifdef INET6
862 if (isipv6)
863 error = tcp6_connect(tp, nam, td);
864 else
865 #endif /* INET6 */
866 error = tcp_connect(tp, nam, td);
867 if (error)
868 goto out;
869 tp->snd_wnd = TTCP_CLIENT_SND_WND;
870 tcp_mss(tp, -1);
871 INP_INFO_WUNLOCK(&V_tcbinfo);
872 headlocked = 0;
873 } else if (nam) {
874 INP_INFO_WUNLOCK(&V_tcbinfo);
875 headlocked = 0;
876 }
877 tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
878 tp->t_flags |= TF_FORCEDATA;
879 error = tcp_output_send(tp);
880 tp->t_flags &= ~TF_FORCEDATA;
881 }
882 out:
883 TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB :
884 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
885 INP_WUNLOCK(inp);
886 if (headlocked)
887 INP_INFO_WUNLOCK(&V_tcbinfo);
888 return (error);
889 }
890
891 /*
892 * Abort the TCP. Drop the connection abruptly.
893 */
894 static void
895 tcp_usr_abort(struct socket *so)
896 {
897 struct inpcb *inp;
898 struct tcpcb *tp = NULL;
899 TCPDEBUG0;
900
901 inp = sotoinpcb(so);
902 KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL"));
903
904 INP_INFO_WLOCK(&V_tcbinfo);
905 INP_WLOCK(inp);
906 KASSERT(inp->inp_socket != NULL,
907 ("tcp_usr_abort: inp_socket == NULL"));
908
909 /*
910 * If we still have full TCP state, and we're not dropped, drop.
911 */
912 if (!(inp->inp_flags & INP_TIMEWAIT) &&
913 !(inp->inp_flags & INP_DROPPED)) {
914 tp = intotcpcb(inp);
915 TCPDEBUG1();
916 tcp_drop(tp, ECONNABORTED);
917 TCPDEBUG2(PRU_ABORT);
918 }
919 if (!(inp->inp_flags & INP_DROPPED)) {
920 SOCK_LOCK(so);
921 so->so_state |= SS_PROTOREF;
922 SOCK_UNLOCK(so);
923 inp->inp_flags |= INP_SOCKREF;
924 }
925 INP_WUNLOCK(inp);
926 INP_INFO_WUNLOCK(&V_tcbinfo);
927 }
928
929 /*
930 * TCP socket is closed. Start friendly disconnect.
931 */
932 static void
933 tcp_usr_close(struct socket *so)
934 {
935 struct inpcb *inp;
936 struct tcpcb *tp = NULL;
937 TCPDEBUG0;
938
939 inp = sotoinpcb(so);
940 KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL"));
941
942 INP_INFO_WLOCK(&V_tcbinfo);
943 INP_WLOCK(inp);
944 KASSERT(inp->inp_socket != NULL,
945 ("tcp_usr_close: inp_socket == NULL"));
946
947 /*
948 * If we still have full TCP state, and we're not dropped, initiate
949 * a disconnect.
950 */
951 if (!(inp->inp_flags & INP_TIMEWAIT) &&
952 !(inp->inp_flags & INP_DROPPED)) {
953 tp = intotcpcb(inp);
954 TCPDEBUG1();
955 tcp_disconnect(tp);
956 TCPDEBUG2(PRU_CLOSE);
957 }
958 if (!(inp->inp_flags & INP_DROPPED)) {
959 SOCK_LOCK(so);
960 so->so_state |= SS_PROTOREF;
961 SOCK_UNLOCK(so);
962 inp->inp_flags |= INP_SOCKREF;
963 }
964 INP_WUNLOCK(inp);
965 INP_INFO_WUNLOCK(&V_tcbinfo);
966 }
967
968 /*
969 * Receive out-of-band data.
970 */
971 static int
972 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags)
973 {
974 int error = 0;
975 struct inpcb *inp;
976 struct tcpcb *tp = NULL;
977
978 TCPDEBUG0;
979 inp = sotoinpcb(so);
980 KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL"));
981 INP_WLOCK(inp);
982 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
983 error = ECONNRESET;
984 goto out;
985 }
986 tp = intotcpcb(inp);
987 TCPDEBUG1();
988 if ((so->so_oobmark == 0 &&
989 (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) ||
990 so->so_options & SO_OOBINLINE ||
991 tp->t_oobflags & TCPOOB_HADDATA) {
992 error = EINVAL;
993 goto out;
994 }
995 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
996 error = EWOULDBLOCK;
997 goto out;
998 }
999 m->m_len = 1;
1000 *mtod(m, caddr_t) = tp->t_iobc;
1001 if ((flags & MSG_PEEK) == 0)
1002 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
1003
1004 out:
1005 TCPDEBUG2(PRU_RCVOOB);
1006 INP_WUNLOCK(inp);
1007 return (error);
1008 }
1009
1010 struct pr_usrreqs tcp_usrreqs = {
1011 .pru_abort = tcp_usr_abort,
1012 .pru_accept = tcp_usr_accept,
1013 .pru_attach = tcp_usr_attach,
1014 .pru_bind = tcp_usr_bind,
1015 .pru_connect = tcp_usr_connect,
1016 .pru_control = in_control,
1017 .pru_detach = tcp_usr_detach,
1018 .pru_disconnect = tcp_usr_disconnect,
1019 .pru_listen = tcp_usr_listen,
1020 .pru_peeraddr = in_getpeeraddr,
1021 .pru_rcvd = tcp_usr_rcvd,
1022 .pru_rcvoob = tcp_usr_rcvoob,
1023 .pru_send = tcp_usr_send,
1024 .pru_shutdown = tcp_usr_shutdown,
1025 .pru_sockaddr = in_getsockaddr,
1026 #if 0
1027 .pru_soreceive = soreceive_stream,
1028 #endif
1029 .pru_sosetlabel = in_pcbsosetlabel,
1030 .pru_close = tcp_usr_close,
1031 };
1032
1033 #ifdef INET6
1034 struct pr_usrreqs tcp6_usrreqs = {
1035 .pru_abort = tcp_usr_abort,
1036 .pru_accept = tcp6_usr_accept,
1037 .pru_attach = tcp_usr_attach,
1038 .pru_bind = tcp6_usr_bind,
1039 .pru_connect = tcp6_usr_connect,
1040 .pru_control = in6_control,
1041 .pru_detach = tcp_usr_detach,
1042 .pru_disconnect = tcp_usr_disconnect,
1043 .pru_listen = tcp6_usr_listen,
1044 .pru_peeraddr = in6_mapped_peeraddr,
1045 .pru_rcvd = tcp_usr_rcvd,
1046 .pru_rcvoob = tcp_usr_rcvoob,
1047 .pru_send = tcp_usr_send,
1048 .pru_shutdown = tcp_usr_shutdown,
1049 .pru_sockaddr = in6_mapped_sockaddr,
1050 #if 0
1051 .pru_soreceive = soreceive_stream,
1052 #endif
1053 .pru_sosetlabel = in_pcbsosetlabel,
1054 .pru_close = tcp_usr_close,
1055 };
1056 #endif /* INET6 */
1057
1058 /*
1059 * Common subroutine to open a TCP connection to remote host specified
1060 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local
1061 * port number if needed. Call in_pcbconnect_setup to do the routing and
1062 * to choose a local host address (interface). If there is an existing
1063 * incarnation of the same connection in TIME-WAIT state and if the remote
1064 * host was sending CC options and if the connection duration was < MSL, then
1065 * truncate the previous TIME-WAIT state and proceed.
1066 * Initialize connection parameters and enter SYN-SENT state.
1067 */
1068 static int
1069 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1070 {
1071 struct inpcb *inp = tp->t_inpcb, *oinp;
1072 struct socket *so = inp->inp_socket;
1073 struct in_addr laddr;
1074 u_short lport;
1075 int error;
1076
1077 INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
1078 INP_WLOCK_ASSERT(inp);
1079
1080 if (inp->inp_lport == 0) {
1081 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1082 if (error)
1083 return error;
1084 }
1085
1086 /*
1087 * Cannot simply call in_pcbconnect, because there might be an
1088 * earlier incarnation of this same connection still in
1089 * TIME_WAIT state, creating an ADDRINUSE error.
1090 */
1091 laddr = inp->inp_laddr;
1092 lport = inp->inp_lport;
1093 error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport,
1094 &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred);
1095 if (error && oinp == NULL)
1096 return error;
1097 if (oinp)
1098 return EADDRINUSE;
1099 inp->inp_laddr = laddr;
1100 in_pcbrehash(inp);
1101
1102 /*
1103 * Compute window scaling to request:
1104 * Scale to fit into sweet spot. See tcp_syncache.c.
1105 * XXX: This should move to tcp_output().
1106 */
1107 while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1108 (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1109 tp->request_r_scale++;
1110
1111 soisconnecting(so);
1112 TCPSTAT_INC(tcps_connattempt);
1113 tp->t_state = TCPS_SYN_SENT;
1114 tcp_timer_activate(tp, TT_KEEP, tcp_keepinit);
1115 tp->iss = tcp_new_isn(tp);
1116 tp->t_bw_rtseq = tp->iss;
1117 tcp_sendseqinit(tp);
1118
1119 return 0;
1120 }
1121
1122 #ifdef INET6
1123 static int
1124 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1125 {
1126 struct inpcb *inp = tp->t_inpcb, *oinp;
1127 struct socket *so = inp->inp_socket;
1128 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
1129 struct in6_addr addr6;
1130 int error;
1131
1132 INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
1133 INP_WLOCK_ASSERT(inp);
1134
1135 if (inp->inp_lport == 0) {
1136 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1137 if (error)
1138 return error;
1139 }
1140
1141 /*
1142 * Cannot simply call in_pcbconnect, because there might be an
1143 * earlier incarnation of this same connection still in
1144 * TIME_WAIT state, creating an ADDRINUSE error.
1145 * in6_pcbladdr() also handles scope zone IDs.
1146 */
1147 error = in6_pcbladdr(inp, nam, &addr6);
1148 if (error)
1149 return error;
1150 oinp = in6_pcblookup_hash(inp->inp_pcbinfo,
1151 &sin6->sin6_addr, sin6->sin6_port,
1152 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
1153 ? &addr6
1154 : &inp->in6p_laddr,
1155 inp->inp_lport, 0, NULL);
1156 if (oinp)
1157 return EADDRINUSE;
1158 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
1159 inp->in6p_laddr = addr6;
1160 inp->in6p_faddr = sin6->sin6_addr;
1161 inp->inp_fport = sin6->sin6_port;
1162 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
1163 inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
1164 if (inp->inp_flags & IN6P_AUTOFLOWLABEL)
1165 inp->inp_flow |=
1166 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
1167 in_pcbrehash(inp);
1168
1169 /* Compute window scaling to request. */
1170 while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1171 (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1172 tp->request_r_scale++;
1173
1174 soisconnecting(so);
1175 TCPSTAT_INC(tcps_connattempt);
1176 tp->t_state = TCPS_SYN_SENT;
1177 tcp_timer_activate(tp, TT_KEEP, tcp_keepinit);
1178 tp->iss = tcp_new_isn(tp);
1179 tp->t_bw_rtseq = tp->iss;
1180 tcp_sendseqinit(tp);
1181
1182 return 0;
1183 }
1184 #endif /* INET6 */
1185
1186 /*
1187 * Export TCP internal state information via a struct tcp_info, based on the
1188 * Linux 2.6 API. Not ABI compatible as our constants are mapped differently
1189 * (TCP state machine, etc). We export all information using FreeBSD-native
1190 * constants -- for example, the numeric values for tcpi_state will differ
1191 * from Linux.
1192 */
1193 static void
1194 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti)
1195 {
1196
1197 INP_WLOCK_ASSERT(tp->t_inpcb);
1198 bzero(ti, sizeof(*ti));
1199
1200 ti->tcpi_state = tp->t_state;
1201 if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP))
1202 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS;
1203 if (tp->t_flags & TF_SACK_PERMIT)
1204 ti->tcpi_options |= TCPI_OPT_SACK;
1205 if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) {
1206 ti->tcpi_options |= TCPI_OPT_WSCALE;
1207 ti->tcpi_snd_wscale = tp->snd_scale;
1208 ti->tcpi_rcv_wscale = tp->rcv_scale;
1209 }
1210
1211 ti->tcpi_rto = tp->t_rxtcur * tick;
1212 ti->tcpi_last_data_recv = (long)(ticks - (int)tp->t_rcvtime) * tick;
1213 ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT;
1214 ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT;
1215
1216 ti->tcpi_snd_ssthresh = tp->snd_ssthresh;
1217 ti->tcpi_snd_cwnd = tp->snd_cwnd;
1218
1219 /*
1220 * FreeBSD-specific extension fields for tcp_info.
1221 */
1222 ti->tcpi_rcv_space = tp->rcv_wnd;
1223 ti->tcpi_rcv_nxt = tp->rcv_nxt;
1224 ti->tcpi_snd_wnd = tp->snd_wnd;
1225 ti->tcpi_snd_bwnd = tp->snd_bwnd;
1226 ti->tcpi_snd_nxt = tp->snd_nxt;
1227 ti->tcpi_snd_mss = tp->t_maxseg;
1228 ti->tcpi_rcv_mss = tp->t_maxseg;
1229 if (tp->t_flags & TF_TOE)
1230 ti->tcpi_options |= TCPI_OPT_TOE;
1231 ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack;
1232 ti->tcpi_rcv_ooopack = tp->t_rcvoopack;
1233 ti->tcpi_snd_zerowin = tp->t_sndzerowin;
1234 }
1235
1236 /*
1237 * tcp_ctloutput() must drop the inpcb lock before performing copyin on
1238 * socket option arguments. When it re-acquires the lock after the copy, it
1239 * has to revalidate that the connection is still valid for the socket
1240 * option.
1241 */
1242 #define INP_WLOCK_RECHECK(inp) do { \
1243 INP_WLOCK(inp); \
1244 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { \
1245 INP_WUNLOCK(inp); \
1246 return (ECONNRESET); \
1247 } \
1248 tp = intotcpcb(inp); \
1249 } while(0)
1250
1251 int
1252 tcp_ctloutput(struct socket *so, struct sockopt *sopt)
1253 {
1254 int error, opt, optval;
1255 struct inpcb *inp;
1256 struct tcpcb *tp;
1257 struct tcp_info ti;
1258 char buf[TCP_CA_NAME_MAX];
1259 struct cc_algo *algo;
1260
1261 error = 0;
1262 inp = sotoinpcb(so);
1263 KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL"));
1264 INP_WLOCK(inp);
1265 if (sopt->sopt_level != IPPROTO_TCP) {
1266 #ifdef INET6
1267 if (inp->inp_vflag & INP_IPV6PROTO) {
1268 INP_WUNLOCK(inp);
1269 error = ip6_ctloutput(so, sopt);
1270 } else {
1271 #endif /* INET6 */
1272 INP_WUNLOCK(inp);
1273 error = ip_ctloutput(so, sopt);
1274 #ifdef INET6
1275 }
1276 #endif
1277 return (error);
1278 }
1279 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1280 INP_WUNLOCK(inp);
1281 return (ECONNRESET);
1282 }
1283
1284 switch (sopt->sopt_dir) {
1285 case SOPT_SET:
1286 switch (sopt->sopt_name) {
1287 #ifdef TCP_SIGNATURE
1288 case TCP_MD5SIG:
1289 INP_WUNLOCK(inp);
1290 error = sooptcopyin(sopt, &optval, sizeof optval,
1291 sizeof optval);
1292 if (error)
1293 return (error);
1294
1295 INP_WLOCK_RECHECK(inp);
1296 if (optval > 0)
1297 tp->t_flags |= TF_SIGNATURE;
1298 else
1299 tp->t_flags &= ~TF_SIGNATURE;
1300 INP_WUNLOCK(inp);
1301 break;
1302 #endif /* TCP_SIGNATURE */
1303 case TCP_NODELAY:
1304 case TCP_NOOPT:
1305 INP_WUNLOCK(inp);
1306 error = sooptcopyin(sopt, &optval, sizeof optval,
1307 sizeof optval);
1308 if (error)
1309 return (error);
1310
1311 INP_WLOCK_RECHECK(inp);
1312 switch (sopt->sopt_name) {
1313 case TCP_NODELAY:
1314 opt = TF_NODELAY;
1315 break;
1316 case TCP_NOOPT:
1317 opt = TF_NOOPT;
1318 break;
1319 default:
1320 opt = 0; /* dead code to fool gcc */
1321 break;
1322 }
1323
1324 if (optval)
1325 tp->t_flags |= opt;
1326 else
1327 tp->t_flags &= ~opt;
1328 INP_WUNLOCK(inp);
1329 break;
1330
1331 case TCP_NOPUSH:
1332 INP_WUNLOCK(inp);
1333 error = sooptcopyin(sopt, &optval, sizeof optval,
1334 sizeof optval);
1335 if (error)
1336 return (error);
1337
1338 INP_WLOCK_RECHECK(inp);
1339 if (optval)
1340 tp->t_flags |= TF_NOPUSH;
1341 else if (tp->t_flags & TF_NOPUSH) {
1342 tp->t_flags &= ~TF_NOPUSH;
1343 if (TCPS_HAVEESTABLISHED(tp->t_state))
1344 error = tcp_output(tp);
1345 }
1346 INP_WUNLOCK(inp);
1347 break;
1348
1349 case TCP_MAXSEG:
1350 INP_WUNLOCK(inp);
1351 error = sooptcopyin(sopt, &optval, sizeof optval,
1352 sizeof optval);
1353 if (error)
1354 return (error);
1355
1356 INP_WLOCK_RECHECK(inp);
1357 if (optval > 0 && optval <= tp->t_maxseg &&
1358 optval + 40 >= V_tcp_minmss)
1359 tp->t_maxseg = optval;
1360 else
1361 error = EINVAL;
1362 INP_WUNLOCK(inp);
1363 break;
1364
1365 case TCP_INFO:
1366 INP_WUNLOCK(inp);
1367 error = EINVAL;
1368 break;
1369
1370 case TCP_CONGESTION:
1371 INP_WUNLOCK(inp);
1372 bzero(buf, sizeof(buf));
1373 error = sooptcopyin(sopt, &buf, sizeof(buf), 1);
1374 if (error)
1375 break;
1376 INP_WLOCK_RECHECK(inp);
1377 /*
1378 * Return EINVAL if we can't find the requested cc algo.
1379 */
1380 error = EINVAL;
1381 CC_LIST_RLOCK();
1382 STAILQ_FOREACH(algo, &cc_list, entries) {
1383 if (strncmp(buf, algo->name, TCP_CA_NAME_MAX)
1384 == 0) {
1385 /* We've found the requested algo. */
1386 error = 0;
1387 /*
1388 * We hold a write lock over the tcb
1389 * so it's safe to do these things
1390 * without ordering concerns.
1391 */
1392 if (CC_ALGO(tp)->cb_destroy != NULL)
1393 CC_ALGO(tp)->cb_destroy(tp->ccv);
1394 CC_ALGO(tp) = algo;
1395 /*
1396 * If something goes pear shaped
1397 * initialising the new algo,
1398 * fall back to newreno (which
1399 * does not require initialisation).
1400 */
1401 if (algo->cb_init != NULL)
1402 if (algo->cb_init(tp->ccv) > 0) {
1403 CC_ALGO(tp) = &newreno_cc_algo;
1404 /*
1405 * The only reason init
1406 * should fail is
1407 * because of malloc.
1408 */
1409 error = ENOMEM;
1410 }
1411 break; /* Break the STAILQ_FOREACH. */
1412 }
1413 }
1414 CC_LIST_RUNLOCK();
1415 INP_WUNLOCK(inp);
1416 break;
1417
1418 default:
1419 INP_WUNLOCK(inp);
1420 error = ENOPROTOOPT;
1421 break;
1422 }
1423 break;
1424
1425 case SOPT_GET:
1426 tp = intotcpcb(inp);
1427 switch (sopt->sopt_name) {
1428 #ifdef TCP_SIGNATURE
1429 case TCP_MD5SIG:
1430 optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0;
1431 INP_WUNLOCK(inp);
1432 error = sooptcopyout(sopt, &optval, sizeof optval);
1433 break;
1434 #endif
1435
1436 case TCP_NODELAY:
1437 optval = tp->t_flags & TF_NODELAY;
1438 INP_WUNLOCK(inp);
1439 error = sooptcopyout(sopt, &optval, sizeof optval);
1440 break;
1441 case TCP_MAXSEG:
1442 optval = tp->t_maxseg;
1443 INP_WUNLOCK(inp);
1444 error = sooptcopyout(sopt, &optval, sizeof optval);
1445 break;
1446 case TCP_NOOPT:
1447 optval = tp->t_flags & TF_NOOPT;
1448 INP_WUNLOCK(inp);
1449 error = sooptcopyout(sopt, &optval, sizeof optval);
1450 break;
1451 case TCP_NOPUSH:
1452 optval = tp->t_flags & TF_NOPUSH;
1453 INP_WUNLOCK(inp);
1454 error = sooptcopyout(sopt, &optval, sizeof optval);
1455 break;
1456 case TCP_INFO:
1457 tcp_fill_info(tp, &ti);
1458 INP_WUNLOCK(inp);
1459 error = sooptcopyout(sopt, &ti, sizeof ti);
1460 break;
1461 case TCP_CONGESTION:
1462 bzero(buf, sizeof(buf));
1463 strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX);
1464 INP_WUNLOCK(inp);
1465 error = sooptcopyout(sopt, buf, TCP_CA_NAME_MAX);
1466 break;
1467 default:
1468 INP_WUNLOCK(inp);
1469 error = ENOPROTOOPT;
1470 break;
1471 }
1472 break;
1473 }
1474 return (error);
1475 }
1476 #undef INP_WLOCK_RECHECK
1477
1478 /*
1479 * tcp_sendspace and tcp_recvspace are the default send and receive window
1480 * sizes, respectively. These are obsolescent (this information should
1481 * be set by the route).
1482 */
1483 u_long tcp_sendspace = 1024*32;
1484 SYSCTL_ULONG(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW,
1485 &tcp_sendspace , 0, "Maximum outgoing TCP datagram size");
1486 u_long tcp_recvspace = 1024*64;
1487 SYSCTL_ULONG(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
1488 &tcp_recvspace , 0, "Maximum incoming TCP datagram size");
1489
1490 /*
1491 * Attach TCP protocol to socket, allocating
1492 * internet protocol control block, tcp control block,
1493 * bufer space, and entering LISTEN state if to accept connections.
1494 */
1495 static int
1496 tcp_attach(struct socket *so)
1497 {
1498 struct tcpcb *tp;
1499 struct inpcb *inp;
1500 int error;
1501
1502 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1503 error = soreserve(so, tcp_sendspace, tcp_recvspace);
1504 if (error)
1505 return (error);
1506 }
1507 so->so_rcv.sb_flags |= SB_AUTOSIZE;
1508 so->so_snd.sb_flags |= SB_AUTOSIZE;
1509 INP_INFO_WLOCK(&V_tcbinfo);
1510 error = in_pcballoc(so, &V_tcbinfo);
1511 if (error) {
1512 INP_INFO_WUNLOCK(&V_tcbinfo);
1513 return (error);
1514 }
1515 inp = sotoinpcb(so);
1516 #ifdef INET6
1517 if (inp->inp_vflag & INP_IPV6PROTO) {
1518 inp->inp_vflag |= INP_IPV6;
1519 inp->in6p_hops = -1; /* use kernel default */
1520 }
1521 else
1522 #endif
1523 inp->inp_vflag |= INP_IPV4;
1524 tp = tcp_newtcpcb(inp);
1525 if (tp == NULL) {
1526 in_pcbdetach(inp);
1527 in_pcbfree(inp);
1528 INP_INFO_WUNLOCK(&V_tcbinfo);
1529 return (ENOBUFS);
1530 }
1531 tp->t_state = TCPS_CLOSED;
1532 INP_WUNLOCK(inp);
1533 INP_INFO_WUNLOCK(&V_tcbinfo);
1534 return (0);
1535 }
1536
1537 /*
1538 * Initiate (or continue) disconnect.
1539 * If embryonic state, just send reset (once).
1540 * If in ``let data drain'' option and linger null, just drop.
1541 * Otherwise (hard), mark socket disconnecting and drop
1542 * current input data; switch states based on user close, and
1543 * send segment to peer (with FIN).
1544 */
1545 static void
1546 tcp_disconnect(struct tcpcb *tp)
1547 {
1548 struct inpcb *inp = tp->t_inpcb;
1549 struct socket *so = inp->inp_socket;
1550
1551 INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
1552 INP_WLOCK_ASSERT(inp);
1553
1554 /*
1555 * Neither tcp_close() nor tcp_drop() should return NULL, as the
1556 * socket is still open.
1557 */
1558 if (tp->t_state < TCPS_ESTABLISHED) {
1559 tp = tcp_close(tp);
1560 KASSERT(tp != NULL,
1561 ("tcp_disconnect: tcp_close() returned NULL"));
1562 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
1563 tp = tcp_drop(tp, 0);
1564 KASSERT(tp != NULL,
1565 ("tcp_disconnect: tcp_drop() returned NULL"));
1566 } else {
1567 soisdisconnecting(so);
1568 sbflush(&so->so_rcv);
1569 tcp_usrclosed(tp);
1570 if (!(inp->inp_flags & INP_DROPPED))
1571 tcp_output_disconnect(tp);
1572 }
1573 }
1574
1575 /*
1576 * User issued close, and wish to trail through shutdown states:
1577 * if never received SYN, just forget it. If got a SYN from peer,
1578 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
1579 * If already got a FIN from peer, then almost done; go to LAST_ACK
1580 * state. In all other cases, have already sent FIN to peer (e.g.
1581 * after PRU_SHUTDOWN), and just have to play tedious game waiting
1582 * for peer to send FIN or not respond to keep-alives, etc.
1583 * We can let the user exit from the close as soon as the FIN is acked.
1584 */
1585 static void
1586 tcp_usrclosed(struct tcpcb *tp)
1587 {
1588
1589 INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
1590 INP_WLOCK_ASSERT(tp->t_inpcb);
1591
1592 switch (tp->t_state) {
1593 case TCPS_LISTEN:
1594 tcp_offload_listen_close(tp);
1595 /* FALLTHROUGH */
1596 case TCPS_CLOSED:
1597 tp->t_state = TCPS_CLOSED;
1598 tp = tcp_close(tp);
1599 /*
1600 * tcp_close() should never return NULL here as the socket is
1601 * still open.
1602 */
1603 KASSERT(tp != NULL,
1604 ("tcp_usrclosed: tcp_close() returned NULL"));
1605 break;
1606
1607 case TCPS_SYN_SENT:
1608 case TCPS_SYN_RECEIVED:
1609 tp->t_flags |= TF_NEEDFIN;
1610 break;
1611
1612 case TCPS_ESTABLISHED:
1613 tp->t_state = TCPS_FIN_WAIT_1;
1614 break;
1615
1616 case TCPS_CLOSE_WAIT:
1617 tp->t_state = TCPS_LAST_ACK;
1618 break;
1619 }
1620 if (tp->t_state >= TCPS_FIN_WAIT_2) {
1621 soisdisconnected(tp->t_inpcb->inp_socket);
1622 /* Prevent the connection hanging in FIN_WAIT_2 forever. */
1623 if (tp->t_state == TCPS_FIN_WAIT_2) {
1624 int timeout;
1625
1626 timeout = (tcp_fast_finwait2_recycle) ?
1627 tcp_finwait2_timeout : tcp_maxidle;
1628 tcp_timer_activate(tp, TT_2MSL, timeout);
1629 }
1630 }
1631 }
1632
1633 #ifdef DDB
1634 static void
1635 db_print_indent(int indent)
1636 {
1637 int i;
1638
1639 for (i = 0; i < indent; i++)
1640 db_printf(" ");
1641 }
1642
1643 static void
1644 db_print_tstate(int t_state)
1645 {
1646
1647 switch (t_state) {
1648 case TCPS_CLOSED:
1649 db_printf("TCPS_CLOSED");
1650 return;
1651
1652 case TCPS_LISTEN:
1653 db_printf("TCPS_LISTEN");
1654 return;
1655
1656 case TCPS_SYN_SENT:
1657 db_printf("TCPS_SYN_SENT");
1658 return;
1659
1660 case TCPS_SYN_RECEIVED:
1661 db_printf("TCPS_SYN_RECEIVED");
1662 return;
1663
1664 case TCPS_ESTABLISHED:
1665 db_printf("TCPS_ESTABLISHED");
1666 return;
1667
1668 case TCPS_CLOSE_WAIT:
1669 db_printf("TCPS_CLOSE_WAIT");
1670 return;
1671
1672 case TCPS_FIN_WAIT_1:
1673 db_printf("TCPS_FIN_WAIT_1");
1674 return;
1675
1676 case TCPS_CLOSING:
1677 db_printf("TCPS_CLOSING");
1678 return;
1679
1680 case TCPS_LAST_ACK:
1681 db_printf("TCPS_LAST_ACK");
1682 return;
1683
1684 case TCPS_FIN_WAIT_2:
1685 db_printf("TCPS_FIN_WAIT_2");
1686 return;
1687
1688 case TCPS_TIME_WAIT:
1689 db_printf("TCPS_TIME_WAIT");
1690 return;
1691
1692 default:
1693 db_printf("unknown");
1694 return;
1695 }
1696 }
1697
1698 static void
1699 db_print_tflags(u_int t_flags)
1700 {
1701 int comma;
1702
1703 comma = 0;
1704 if (t_flags & TF_ACKNOW) {
1705 db_printf("%sTF_ACKNOW", comma ? ", " : "");
1706 comma = 1;
1707 }
1708 if (t_flags & TF_DELACK) {
1709 db_printf("%sTF_DELACK", comma ? ", " : "");
1710 comma = 1;
1711 }
1712 if (t_flags & TF_NODELAY) {
1713 db_printf("%sTF_NODELAY", comma ? ", " : "");
1714 comma = 1;
1715 }
1716 if (t_flags & TF_NOOPT) {
1717 db_printf("%sTF_NOOPT", comma ? ", " : "");
1718 comma = 1;
1719 }
1720 if (t_flags & TF_SENTFIN) {
1721 db_printf("%sTF_SENTFIN", comma ? ", " : "");
1722 comma = 1;
1723 }
1724 if (t_flags & TF_REQ_SCALE) {
1725 db_printf("%sTF_REQ_SCALE", comma ? ", " : "");
1726 comma = 1;
1727 }
1728 if (t_flags & TF_RCVD_SCALE) {
1729 db_printf("%sTF_RECVD_SCALE", comma ? ", " : "");
1730 comma = 1;
1731 }
1732 if (t_flags & TF_REQ_TSTMP) {
1733 db_printf("%sTF_REQ_TSTMP", comma ? ", " : "");
1734 comma = 1;
1735 }
1736 if (t_flags & TF_RCVD_TSTMP) {
1737 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : "");
1738 comma = 1;
1739 }
1740 if (t_flags & TF_SACK_PERMIT) {
1741 db_printf("%sTF_SACK_PERMIT", comma ? ", " : "");
1742 comma = 1;
1743 }
1744 if (t_flags & TF_NEEDSYN) {
1745 db_printf("%sTF_NEEDSYN", comma ? ", " : "");
1746 comma = 1;
1747 }
1748 if (t_flags & TF_NEEDFIN) {
1749 db_printf("%sTF_NEEDFIN", comma ? ", " : "");
1750 comma = 1;
1751 }
1752 if (t_flags & TF_NOPUSH) {
1753 db_printf("%sTF_NOPUSH", comma ? ", " : "");
1754 comma = 1;
1755 }
1756 if (t_flags & TF_MORETOCOME) {
1757 db_printf("%sTF_MORETOCOME", comma ? ", " : "");
1758 comma = 1;
1759 }
1760 if (t_flags & TF_LQ_OVERFLOW) {
1761 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : "");
1762 comma = 1;
1763 }
1764 if (t_flags & TF_LASTIDLE) {
1765 db_printf("%sTF_LASTIDLE", comma ? ", " : "");
1766 comma = 1;
1767 }
1768 if (t_flags & TF_RXWIN0SENT) {
1769 db_printf("%sTF_RXWIN0SENT", comma ? ", " : "");
1770 comma = 1;
1771 }
1772 if (t_flags & TF_FASTRECOVERY) {
1773 db_printf("%sTF_FASTRECOVERY", comma ? ", " : "");
1774 comma = 1;
1775 }
1776 if (t_flags & TF_CONGRECOVERY) {
1777 db_printf("%sTF_CONGRECOVERY", comma ? ", " : "");
1778 comma = 1;
1779 }
1780 if (t_flags & TF_WASFRECOVERY) {
1781 db_printf("%sTF_WASFRECOVERY", comma ? ", " : "");
1782 comma = 1;
1783 }
1784 if (t_flags & TF_SIGNATURE) {
1785 db_printf("%sTF_SIGNATURE", comma ? ", " : "");
1786 comma = 1;
1787 }
1788 if (t_flags & TF_FORCEDATA) {
1789 db_printf("%sTF_FORCEDATA", comma ? ", " : "");
1790 comma = 1;
1791 }
1792 if (t_flags & TF_TSO) {
1793 db_printf("%sTF_TSO", comma ? ", " : "");
1794 comma = 1;
1795 }
1796 if (t_flags & TF_ECN_PERMIT) {
1797 db_printf("%sTF_ECN_PERMIT", comma ? ", " : "");
1798 comma = 1;
1799 }
1800 }
1801
1802 static void
1803 db_print_toobflags(char t_oobflags)
1804 {
1805 int comma;
1806
1807 comma = 0;
1808 if (t_oobflags & TCPOOB_HAVEDATA) {
1809 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : "");
1810 comma = 1;
1811 }
1812 if (t_oobflags & TCPOOB_HADDATA) {
1813 db_printf("%sTCPOOB_HADDATA", comma ? ", " : "");
1814 comma = 1;
1815 }
1816 }
1817
1818 static void
1819 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent)
1820 {
1821
1822 db_print_indent(indent);
1823 db_printf("%s at %p\n", name, tp);
1824
1825 indent += 2;
1826
1827 db_print_indent(indent);
1828 db_printf("t_segq first: %p t_segqlen: %d t_dupacks: %d\n",
1829 LIST_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks);
1830
1831 db_print_indent(indent);
1832 db_printf("tt_rexmt: %p tt_persist: %p tt_keep: %p\n",
1833 &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep);
1834
1835 db_print_indent(indent);
1836 db_printf("tt_2msl: %p tt_delack: %p t_inpcb: %p\n", &tp->t_timers->tt_2msl,
1837 &tp->t_timers->tt_delack, tp->t_inpcb);
1838
1839 db_print_indent(indent);
1840 db_printf("t_state: %d (", tp->t_state);
1841 db_print_tstate(tp->t_state);
1842 db_printf(")\n");
1843
1844 db_print_indent(indent);
1845 db_printf("t_flags: 0x%x (", tp->t_flags);
1846 db_print_tflags(tp->t_flags);
1847 db_printf(")\n");
1848
1849 db_print_indent(indent);
1850 db_printf("snd_una: 0x%08x snd_max: 0x%08x snd_nxt: x0%08x\n",
1851 tp->snd_una, tp->snd_max, tp->snd_nxt);
1852
1853 db_print_indent(indent);
1854 db_printf("snd_up: 0x%08x snd_wl1: 0x%08x snd_wl2: 0x%08x\n",
1855 tp->snd_up, tp->snd_wl1, tp->snd_wl2);
1856
1857 db_print_indent(indent);
1858 db_printf("iss: 0x%08x irs: 0x%08x rcv_nxt: 0x%08x\n",
1859 tp->iss, tp->irs, tp->rcv_nxt);
1860
1861 db_print_indent(indent);
1862 db_printf("rcv_adv: 0x%08x rcv_wnd: %lu rcv_up: 0x%08x\n",
1863 tp->rcv_adv, tp->rcv_wnd, tp->rcv_up);
1864
1865 db_print_indent(indent);
1866 db_printf("snd_wnd: %lu snd_cwnd: %lu snd_bwnd: %lu\n",
1867 tp->snd_wnd, tp->snd_cwnd, tp->snd_bwnd);
1868
1869 db_print_indent(indent);
1870 db_printf("snd_ssthresh: %lu snd_bandwidth: %lu snd_recover: "
1871 "0x%08x\n", tp->snd_ssthresh, tp->snd_bandwidth,
1872 tp->snd_recover);
1873
1874 db_print_indent(indent);
1875 db_printf("t_maxopd: %u t_rcvtime: %u t_startime: %u\n",
1876 tp->t_maxopd, tp->t_rcvtime, tp->t_starttime);
1877
1878 db_print_indent(indent);
1879 db_printf("t_rttime: %u t_rtsq: 0x%08x t_bw_rtttime: %u\n",
1880 tp->t_rtttime, tp->t_rtseq, tp->t_bw_rtttime);
1881
1882 db_print_indent(indent);
1883 db_printf("t_bw_rtseq: 0x%08x t_rxtcur: %d t_maxseg: %u "
1884 "t_srtt: %d\n", tp->t_bw_rtseq, tp->t_rxtcur, tp->t_maxseg,
1885 tp->t_srtt);
1886
1887 db_print_indent(indent);
1888 db_printf("t_rttvar: %d t_rxtshift: %d t_rttmin: %u "
1889 "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin,
1890 tp->t_rttbest);
1891
1892 db_print_indent(indent);
1893 db_printf("t_rttupdated: %lu max_sndwnd: %lu t_softerror: %d\n",
1894 tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror);
1895
1896 db_print_indent(indent);
1897 db_printf("t_oobflags: 0x%x (", tp->t_oobflags);
1898 db_print_toobflags(tp->t_oobflags);
1899 db_printf(") t_iobc: 0x%02x\n", tp->t_iobc);
1900
1901 db_print_indent(indent);
1902 db_printf("snd_scale: %u rcv_scale: %u request_r_scale: %u\n",
1903 tp->snd_scale, tp->rcv_scale, tp->request_r_scale);
1904
1905 db_print_indent(indent);
1906 db_printf("ts_recent: %u ts_recent_age: %u\n",
1907 tp->ts_recent, tp->ts_recent_age);
1908
1909 db_print_indent(indent);
1910 db_printf("ts_offset: %u last_ack_sent: 0x%08x snd_cwnd_prev: "
1911 "%lu\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev);
1912
1913 db_print_indent(indent);
1914 db_printf("snd_ssthresh_prev: %lu snd_recover_prev: 0x%08x "
1915 "t_badrxtwin: %u\n", tp->snd_ssthresh_prev,
1916 tp->snd_recover_prev, tp->t_badrxtwin);
1917
1918 db_print_indent(indent);
1919 db_printf("snd_numholes: %d snd_holes first: %p\n",
1920 tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes));
1921
1922 db_print_indent(indent);
1923 db_printf("snd_fack: 0x%08x rcv_numsacks: %d sack_newdata: "
1924 "0x%08x\n", tp->snd_fack, tp->rcv_numsacks, tp->sack_newdata);
1925
1926 /* Skip sackblks, sackhint. */
1927
1928 db_print_indent(indent);
1929 db_printf("t_rttlow: %d rfbuf_ts: %u rfbuf_cnt: %d\n",
1930 tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt);
1931 }
1932
1933 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb)
1934 {
1935 struct tcpcb *tp;
1936
1937 if (!have_addr) {
1938 db_printf("usage: show tcpcb <addr>\n");
1939 return;
1940 }
1941 tp = (struct tcpcb *)addr;
1942
1943 db_print_tcpcb(tp, "tcpcb", 0);
1944 }
1945 #endif
Cache object: 4a0878316ac38dfbfbcbdc0861a7d142
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