1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1982, 1986, 1988, 1993
5 * The Regents of the University of California.
6 * Copyright (c) 2006-2007 Robert N. M. Watson
7 * Copyright (c) 2010-2011 Juniper Networks, Inc.
8 * All rights reserved.
9 *
10 * Portions of this software were developed by Robert N. M. Watson under
11 * contract to Juniper Networks, Inc.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 */
37
38 #include <sys/cdefs.h>
39 #include "opt_ddb.h"
40 #include "opt_inet.h"
41 #include "opt_inet6.h"
42 #include "opt_ipsec.h"
43 #include "opt_kern_tls.h"
44
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/arb.h>
48 #include <sys/limits.h>
49 #include <sys/malloc.h>
50 #include <sys/refcount.h>
51 #include <sys/kernel.h>
52 #include <sys/ktls.h>
53 #include <sys/qmath.h>
54 #include <sys/sysctl.h>
55 #include <sys/mbuf.h>
56 #ifdef INET6
57 #include <sys/domain.h>
58 #endif /* INET6 */
59 #include <sys/socket.h>
60 #include <sys/socketvar.h>
61 #include <sys/protosw.h>
62 #include <sys/proc.h>
63 #include <sys/jail.h>
64 #include <sys/stats.h>
65
66 #ifdef DDB
67 #include <ddb/ddb.h>
68 #endif
69
70 #include <net/if.h>
71 #include <net/if_var.h>
72 #include <net/route.h>
73 #include <net/vnet.h>
74
75 #include <netinet/in.h>
76 #include <netinet/in_kdtrace.h>
77 #include <netinet/in_pcb.h>
78 #include <netinet/in_systm.h>
79 #include <netinet/in_var.h>
80 #include <netinet/ip.h>
81 #include <netinet/ip_var.h>
82 #ifdef INET6
83 #include <netinet/ip6.h>
84 #include <netinet6/in6_pcb.h>
85 #include <netinet6/ip6_var.h>
86 #include <netinet6/scope6_var.h>
87 #endif
88 #include <netinet/tcp.h>
89 #include <netinet/tcp_fsm.h>
90 #include <netinet/tcp_seq.h>
91 #include <netinet/tcp_timer.h>
92 #include <netinet/tcp_var.h>
93 #include <netinet/tcp_log_buf.h>
94 #include <netinet/tcpip.h>
95 #include <netinet/cc/cc.h>
96 #include <netinet/tcp_fastopen.h>
97 #include <netinet/tcp_hpts.h>
98 #ifdef TCPPCAP
99 #include <netinet/tcp_pcap.h>
100 #endif
101 #ifdef TCP_OFFLOAD
102 #include <netinet/tcp_offload.h>
103 #endif
104 #include <netipsec/ipsec_support.h>
105
106 #include <vm/vm.h>
107 #include <vm/vm_param.h>
108 #include <vm/pmap.h>
109 #include <vm/vm_extern.h>
110 #include <vm/vm_map.h>
111 #include <vm/vm_page.h>
112
113 /*
114 * TCP protocol interface to socket abstraction.
115 */
116 #ifdef INET
117 static int tcp_connect(struct tcpcb *, struct sockaddr_in *,
118 struct thread *td);
119 #endif /* INET */
120 #ifdef INET6
121 static int tcp6_connect(struct tcpcb *, struct sockaddr_in6 *,
122 struct thread *td);
123 #endif /* INET6 */
124 static void tcp_disconnect(struct tcpcb *);
125 static void tcp_usrclosed(struct tcpcb *);
126 static void tcp_fill_info(const struct tcpcb *, struct tcp_info *);
127
128 static int tcp_pru_options_support(struct tcpcb *tp, int flags);
129
130 static void
tcp_bblog_pru(struct tcpcb * tp,uint32_t pru,int error)131 tcp_bblog_pru(struct tcpcb *tp, uint32_t pru, int error)
132 {
133 struct tcp_log_buffer *lgb;
134
135 KASSERT(tp != NULL, ("tcp_bblog_pru: tp == NULL"));
136 INP_WLOCK_ASSERT(tptoinpcb(tp));
137 if (tcp_bblogging_on(tp)) {
138 lgb = tcp_log_event(tp, NULL, NULL, NULL, TCP_LOG_PRU, error,
139 0, NULL, false, NULL, NULL, 0, NULL);
140 } else {
141 lgb = NULL;
142 }
143 if (lgb != NULL) {
144 if (error >= 0) {
145 lgb->tlb_errno = (uint32_t)error;
146 }
147 lgb->tlb_flex1 = pru;
148 }
149 }
150
151 /*
152 * TCP attaches to socket via pru_attach(), reserving space,
153 * and an internet control block.
154 */
155 static int
tcp_usr_attach(struct socket * so,int proto,struct thread * td)156 tcp_usr_attach(struct socket *so, int proto, struct thread *td)
157 {
158 struct inpcb *inp;
159 struct tcpcb *tp = NULL;
160 int error;
161
162 inp = sotoinpcb(so);
163 KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL"));
164
165 error = soreserve(so, V_tcp_sendspace, V_tcp_recvspace);
166 if (error)
167 goto out;
168
169 so->so_rcv.sb_flags |= SB_AUTOSIZE;
170 so->so_snd.sb_flags |= SB_AUTOSIZE;
171 error = in_pcballoc(so, &V_tcbinfo);
172 if (error)
173 goto out;
174 inp = sotoinpcb(so);
175 tp = tcp_newtcpcb(inp, NULL);
176 if (tp == NULL) {
177 error = ENOBUFS;
178 in_pcbfree(inp);
179 goto out;
180 }
181 tp->t_state = TCPS_CLOSED;
182 tcp_bblog_pru(tp, PRU_ATTACH, error);
183 INP_WUNLOCK(inp);
184 TCPSTATES_INC(TCPS_CLOSED);
185 out:
186 TCP_PROBE2(debug__user, tp, PRU_ATTACH);
187 return (error);
188 }
189
190 /*
191 * tcp_usr_detach is called when the socket layer loses its final reference
192 * to the socket, be it a file descriptor reference, a reference from TCP,
193 * etc. At this point, there is only one case in which we will keep around
194 * inpcb state: time wait.
195 */
196 static void
tcp_usr_detach(struct socket * so)197 tcp_usr_detach(struct socket *so)
198 {
199 struct inpcb *inp;
200 struct tcpcb *tp;
201
202 inp = sotoinpcb(so);
203 KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
204 INP_WLOCK(inp);
205 KASSERT(so->so_pcb == inp && inp->inp_socket == so,
206 ("%s: socket %p inp %p mismatch", __func__, so, inp));
207
208 tp = intotcpcb(inp);
209
210 KASSERT(inp->inp_flags & INP_DROPPED ||
211 tp->t_state < TCPS_SYN_SENT,
212 ("%s: inp %p not dropped or embryonic", __func__, inp));
213
214 tcp_discardcb(tp);
215 in_pcbfree(inp);
216 }
217
218 #ifdef INET
219 /*
220 * Give the socket an address.
221 */
222 static int
tcp_usr_bind(struct socket * so,struct sockaddr * nam,struct thread * td)223 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
224 {
225 int error = 0;
226 struct inpcb *inp;
227 struct tcpcb *tp;
228 struct sockaddr_in *sinp;
229
230 inp = sotoinpcb(so);
231 KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL"));
232 INP_WLOCK(inp);
233 if (inp->inp_flags & INP_DROPPED) {
234 INP_WUNLOCK(inp);
235 return (EINVAL);
236 }
237 tp = intotcpcb(inp);
238
239 sinp = (struct sockaddr_in *)nam;
240 if (nam->sa_family != AF_INET) {
241 /*
242 * Preserve compatibility with old programs.
243 */
244 if (nam->sa_family != AF_UNSPEC ||
245 nam->sa_len < offsetof(struct sockaddr_in, sin_zero) ||
246 sinp->sin_addr.s_addr != INADDR_ANY) {
247 error = EAFNOSUPPORT;
248 goto out;
249 }
250 nam->sa_family = AF_INET;
251 }
252 if (nam->sa_len != sizeof(*sinp)) {
253 error = EINVAL;
254 goto out;
255 }
256 /*
257 * Must check for multicast addresses and disallow binding
258 * to them.
259 */
260 if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
261 error = EAFNOSUPPORT;
262 goto out;
263 }
264 INP_HASH_WLOCK(&V_tcbinfo);
265 error = in_pcbbind(inp, sinp, td->td_ucred);
266 INP_HASH_WUNLOCK(&V_tcbinfo);
267 out:
268 tcp_bblog_pru(tp, PRU_BIND, error);
269 TCP_PROBE2(debug__user, tp, PRU_BIND);
270 INP_WUNLOCK(inp);
271
272 return (error);
273 }
274 #endif /* INET */
275
276 #ifdef INET6
277 static int
tcp6_usr_bind(struct socket * so,struct sockaddr * nam,struct thread * td)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;
283 struct sockaddr_in6 *sin6;
284 u_char vflagsav;
285
286 inp = sotoinpcb(so);
287 KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL"));
288 INP_WLOCK(inp);
289 if (inp->inp_flags & INP_DROPPED) {
290 INP_WUNLOCK(inp);
291 return (EINVAL);
292 }
293 tp = intotcpcb(inp);
294
295 vflagsav = inp->inp_vflag;
296
297 sin6 = (struct sockaddr_in6 *)nam;
298 if (nam->sa_family != AF_INET6) {
299 error = EAFNOSUPPORT;
300 goto out;
301 }
302 if (nam->sa_len != sizeof(*sin6)) {
303 error = EINVAL;
304 goto out;
305 }
306 /*
307 * Must check for multicast addresses and disallow binding
308 * to them.
309 */
310 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
311 error = EAFNOSUPPORT;
312 goto out;
313 }
314
315 INP_HASH_WLOCK(&V_tcbinfo);
316 inp->inp_vflag &= ~INP_IPV4;
317 inp->inp_vflag |= INP_IPV6;
318 #ifdef INET
319 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
320 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
321 inp->inp_vflag |= INP_IPV4;
322 else if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
323 struct sockaddr_in sin;
324
325 in6_sin6_2_sin(&sin, sin6);
326 if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
327 error = EAFNOSUPPORT;
328 INP_HASH_WUNLOCK(&V_tcbinfo);
329 goto out;
330 }
331 inp->inp_vflag |= INP_IPV4;
332 inp->inp_vflag &= ~INP_IPV6;
333 error = in_pcbbind(inp, &sin, td->td_ucred);
334 INP_HASH_WUNLOCK(&V_tcbinfo);
335 goto out;
336 }
337 }
338 #endif
339 error = in6_pcbbind(inp, sin6, td->td_ucred);
340 INP_HASH_WUNLOCK(&V_tcbinfo);
341 out:
342 if (error != 0)
343 inp->inp_vflag = vflagsav;
344 tcp_bblog_pru(tp, PRU_BIND, error);
345 TCP_PROBE2(debug__user, tp, PRU_BIND);
346 INP_WUNLOCK(inp);
347 return (error);
348 }
349 #endif /* INET6 */
350
351 #ifdef INET
352 /*
353 * Prepare to accept connections.
354 */
355 static int
tcp_usr_listen(struct socket * so,int backlog,struct thread * td)356 tcp_usr_listen(struct socket *so, int backlog, struct thread *td)
357 {
358 int error = 0;
359 struct inpcb *inp;
360 struct tcpcb *tp;
361
362 inp = sotoinpcb(so);
363 KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL"));
364 INP_WLOCK(inp);
365 if (inp->inp_flags & INP_DROPPED) {
366 INP_WUNLOCK(inp);
367 return (EINVAL);
368 }
369 tp = intotcpcb(inp);
370
371 SOCK_LOCK(so);
372 error = solisten_proto_check(so);
373 if (error != 0) {
374 SOCK_UNLOCK(so);
375 goto out;
376 }
377 if (inp->inp_lport == 0) {
378 INP_HASH_WLOCK(&V_tcbinfo);
379 error = in_pcbbind(inp, NULL, td->td_ucred);
380 INP_HASH_WUNLOCK(&V_tcbinfo);
381 }
382 if (error == 0) {
383 tcp_state_change(tp, TCPS_LISTEN);
384 solisten_proto(so, backlog);
385 #ifdef TCP_OFFLOAD
386 if ((so->so_options & SO_NO_OFFLOAD) == 0)
387 tcp_offload_listen_start(tp);
388 #endif
389 } else {
390 solisten_proto_abort(so);
391 }
392 SOCK_UNLOCK(so);
393
394 if (tp->t_flags & TF_FASTOPEN)
395 tp->t_tfo_pending = tcp_fastopen_alloc_counter();
396
397 out:
398 tcp_bblog_pru(tp, PRU_LISTEN, error);
399 TCP_PROBE2(debug__user, tp, PRU_LISTEN);
400 INP_WUNLOCK(inp);
401 return (error);
402 }
403 #endif /* INET */
404
405 #ifdef INET6
406 static int
tcp6_usr_listen(struct socket * so,int backlog,struct thread * td)407 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td)
408 {
409 int error = 0;
410 struct inpcb *inp;
411 struct tcpcb *tp;
412 u_char vflagsav;
413
414 inp = sotoinpcb(so);
415 KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL"));
416 INP_WLOCK(inp);
417 if (inp->inp_flags & INP_DROPPED) {
418 INP_WUNLOCK(inp);
419 return (EINVAL);
420 }
421 tp = intotcpcb(inp);
422
423 vflagsav = inp->inp_vflag;
424
425 SOCK_LOCK(so);
426 error = solisten_proto_check(so);
427 if (error != 0) {
428 SOCK_UNLOCK(so);
429 goto out;
430 }
431 INP_HASH_WLOCK(&V_tcbinfo);
432 if (inp->inp_lport == 0) {
433 inp->inp_vflag &= ~INP_IPV4;
434 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
435 inp->inp_vflag |= INP_IPV4;
436 error = in6_pcbbind(inp, NULL, td->td_ucred);
437 }
438 INP_HASH_WUNLOCK(&V_tcbinfo);
439 if (error == 0) {
440 tcp_state_change(tp, TCPS_LISTEN);
441 solisten_proto(so, backlog);
442 #ifdef TCP_OFFLOAD
443 if ((so->so_options & SO_NO_OFFLOAD) == 0)
444 tcp_offload_listen_start(tp);
445 #endif
446 } else {
447 solisten_proto_abort(so);
448 }
449 SOCK_UNLOCK(so);
450
451 if (tp->t_flags & TF_FASTOPEN)
452 tp->t_tfo_pending = tcp_fastopen_alloc_counter();
453
454 if (error != 0)
455 inp->inp_vflag = vflagsav;
456
457 out:
458 tcp_bblog_pru(tp, PRU_LISTEN, error);
459 TCP_PROBE2(debug__user, tp, PRU_LISTEN);
460 INP_WUNLOCK(inp);
461 return (error);
462 }
463 #endif /* INET6 */
464
465 #ifdef INET
466 /*
467 * Initiate connection to peer.
468 * Create a template for use in transmissions on this connection.
469 * Enter SYN_SENT state, and mark socket as connecting.
470 * Start keep-alive timer, and seed output sequence space.
471 * Send initial segment on connection.
472 */
473 static int
tcp_usr_connect(struct socket * so,struct sockaddr * nam,struct thread * td)474 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
475 {
476 struct epoch_tracker et;
477 int error = 0;
478 struct inpcb *inp;
479 struct tcpcb *tp;
480 struct sockaddr_in *sinp;
481
482 inp = sotoinpcb(so);
483 KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL"));
484 INP_WLOCK(inp);
485 if (inp->inp_flags & INP_DROPPED) {
486 INP_WUNLOCK(inp);
487 return (ECONNREFUSED);
488 }
489 tp = intotcpcb(inp);
490
491 sinp = (struct sockaddr_in *)nam;
492 if (nam->sa_family != AF_INET) {
493 error = EAFNOSUPPORT;
494 goto out;
495 }
496 if (nam->sa_len != sizeof (*sinp)) {
497 error = EINVAL;
498 goto out;
499 }
500 /*
501 * Must disallow TCP ``connections'' to multicast addresses.
502 */
503 if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
504 error = EAFNOSUPPORT;
505 goto out;
506 }
507 if (ntohl(sinp->sin_addr.s_addr) == INADDR_BROADCAST) {
508 error = EACCES;
509 goto out;
510 }
511 if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0)
512 goto out;
513 if (SOLISTENING(so)) {
514 error = EOPNOTSUPP;
515 goto out;
516 }
517 NET_EPOCH_ENTER(et);
518 if ((error = tcp_connect(tp, sinp, td)) != 0)
519 goto out_in_epoch;
520 #ifdef TCP_OFFLOAD
521 if (registered_toedevs > 0 &&
522 (so->so_options & SO_NO_OFFLOAD) == 0 &&
523 (error = tcp_offload_connect(so, nam)) == 0)
524 goto out_in_epoch;
525 #endif
526 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp));
527 error = tcp_output(tp);
528 KASSERT(error >= 0, ("TCP stack %s requested tcp_drop(%p) at connect()"
529 ", error code %d", tp->t_fb->tfb_tcp_block_name, tp, -error));
530 out_in_epoch:
531 NET_EPOCH_EXIT(et);
532 out:
533 tcp_bblog_pru(tp, PRU_CONNECT, error);
534 TCP_PROBE2(debug__user, tp, PRU_CONNECT);
535 INP_WUNLOCK(inp);
536 return (error);
537 }
538 #endif /* INET */
539
540 #ifdef INET6
541 static int
tcp6_usr_connect(struct socket * so,struct sockaddr * nam,struct thread * td)542 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
543 {
544 struct epoch_tracker et;
545 int error = 0;
546 struct inpcb *inp;
547 struct tcpcb *tp;
548 struct sockaddr_in6 *sin6;
549 u_int8_t incflagsav;
550 u_char vflagsav;
551
552 inp = sotoinpcb(so);
553 KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL"));
554 INP_WLOCK(inp);
555 if (inp->inp_flags & INP_DROPPED) {
556 INP_WUNLOCK(inp);
557 return (ECONNREFUSED);
558 }
559 tp = intotcpcb(inp);
560
561 vflagsav = inp->inp_vflag;
562 incflagsav = inp->inp_inc.inc_flags;
563
564 sin6 = (struct sockaddr_in6 *)nam;
565 if (nam->sa_family != AF_INET6) {
566 error = EAFNOSUPPORT;
567 goto out;
568 }
569 if (nam->sa_len != sizeof (*sin6)) {
570 error = EINVAL;
571 goto out;
572 }
573 /*
574 * Must disallow TCP ``connections'' to multicast addresses.
575 */
576 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
577 error = EAFNOSUPPORT;
578 goto out;
579 }
580 if (SOLISTENING(so)) {
581 error = EINVAL;
582 goto out;
583 }
584 #ifdef INET
585 /*
586 * XXXRW: Some confusion: V4/V6 flags relate to binding, and
587 * therefore probably require the hash lock, which isn't held here.
588 * Is this a significant problem?
589 */
590 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
591 struct sockaddr_in sin;
592
593 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
594 error = EINVAL;
595 goto out;
596 }
597 if ((inp->inp_vflag & INP_IPV4) == 0) {
598 error = EAFNOSUPPORT;
599 goto out;
600 }
601
602 in6_sin6_2_sin(&sin, sin6);
603 if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
604 error = EAFNOSUPPORT;
605 goto out;
606 }
607 if (ntohl(sin.sin_addr.s_addr) == INADDR_BROADCAST) {
608 error = EACCES;
609 goto out;
610 }
611 if ((error = prison_remote_ip4(td->td_ucred,
612 &sin.sin_addr)) != 0)
613 goto out;
614 inp->inp_vflag |= INP_IPV4;
615 inp->inp_vflag &= ~INP_IPV6;
616 NET_EPOCH_ENTER(et);
617 if ((error = tcp_connect(tp, &sin, td)) != 0)
618 goto out_in_epoch;
619 #ifdef TCP_OFFLOAD
620 if (registered_toedevs > 0 &&
621 (so->so_options & SO_NO_OFFLOAD) == 0 &&
622 (error = tcp_offload_connect(so, nam)) == 0)
623 goto out_in_epoch;
624 #endif
625 error = tcp_output(tp);
626 goto out_in_epoch;
627 } else {
628 if ((inp->inp_vflag & INP_IPV6) == 0) {
629 error = EAFNOSUPPORT;
630 goto out;
631 }
632 }
633 #endif
634 if ((error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr)) != 0)
635 goto out;
636 inp->inp_vflag &= ~INP_IPV4;
637 inp->inp_vflag |= INP_IPV6;
638 inp->inp_inc.inc_flags |= INC_ISIPV6;
639 NET_EPOCH_ENTER(et);
640 if ((error = tcp6_connect(tp, sin6, td)) != 0)
641 goto out_in_epoch;
642 #ifdef TCP_OFFLOAD
643 if (registered_toedevs > 0 &&
644 (so->so_options & SO_NO_OFFLOAD) == 0 &&
645 (error = tcp_offload_connect(so, nam)) == 0)
646 goto out_in_epoch;
647 #endif
648 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp));
649 error = tcp_output(tp);
650 out_in_epoch:
651 NET_EPOCH_EXIT(et);
652 out:
653 KASSERT(error >= 0, ("TCP stack %s requested tcp_drop(%p) at connect()"
654 ", error code %d", tp->t_fb->tfb_tcp_block_name, tp, -error));
655 /*
656 * If the implicit bind in the connect call fails, restore
657 * the flags we modified.
658 */
659 if (error != 0 && inp->inp_lport == 0) {
660 inp->inp_vflag = vflagsav;
661 inp->inp_inc.inc_flags = incflagsav;
662 }
663
664 tcp_bblog_pru(tp, PRU_CONNECT, error);
665 TCP_PROBE2(debug__user, tp, PRU_CONNECT);
666 INP_WUNLOCK(inp);
667 return (error);
668 }
669 #endif /* INET6 */
670
671 /*
672 * Initiate disconnect from peer.
673 * If connection never passed embryonic stage, just drop;
674 * else if don't need to let data drain, then can just drop anyways,
675 * else have to begin TCP shutdown process: mark socket disconnecting,
676 * drain unread data, state switch to reflect user close, and
677 * send segment (e.g. FIN) to peer. Socket will be really disconnected
678 * when peer sends FIN and acks ours.
679 *
680 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
681 */
682 static int
tcp_usr_disconnect(struct socket * so)683 tcp_usr_disconnect(struct socket *so)
684 {
685 struct inpcb *inp;
686 struct tcpcb *tp = NULL;
687 struct epoch_tracker et;
688 int error = 0;
689
690 NET_EPOCH_ENTER(et);
691 inp = sotoinpcb(so);
692 KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL"));
693 INP_WLOCK(inp);
694 if (inp->inp_flags & INP_DROPPED) {
695 INP_WUNLOCK(inp);
696 NET_EPOCH_EXIT(et);
697 return (ECONNRESET);
698 }
699 tp = intotcpcb(inp);
700
701 if (tp->t_state == TCPS_TIME_WAIT)
702 goto out;
703 tcp_disconnect(tp);
704 out:
705 tcp_bblog_pru(tp, PRU_DISCONNECT, error);
706 TCP_PROBE2(debug__user, tp, PRU_DISCONNECT);
707 INP_WUNLOCK(inp);
708 NET_EPOCH_EXIT(et);
709 return (error);
710 }
711
712 #ifdef INET
713 /*
714 * Accept a connection. Essentially all the work is done at higher levels;
715 * just return the address of the peer, storing through addr.
716 */
717 static int
tcp_usr_accept(struct socket * so,struct sockaddr * sa)718 tcp_usr_accept(struct socket *so, struct sockaddr *sa)
719 {
720 struct inpcb *inp;
721 struct tcpcb *tp;
722 int error = 0;
723
724 inp = sotoinpcb(so);
725 KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL"));
726 INP_WLOCK(inp);
727 if (inp->inp_flags & INP_DROPPED) {
728 INP_WUNLOCK(inp);
729 return (ECONNABORTED);
730 }
731 tp = intotcpcb(inp);
732
733 if (so->so_state & SS_ISDISCONNECTED)
734 error = ECONNABORTED;
735 else
736 *(struct sockaddr_in *)sa = (struct sockaddr_in ){
737 .sin_family = AF_INET,
738 .sin_len = sizeof(struct sockaddr_in),
739 .sin_port = inp->inp_fport,
740 .sin_addr = inp->inp_faddr,
741 };
742 tcp_bblog_pru(tp, PRU_ACCEPT, error);
743 TCP_PROBE2(debug__user, tp, PRU_ACCEPT);
744 INP_WUNLOCK(inp);
745
746 return (error);
747 }
748 #endif /* INET */
749
750 #ifdef INET6
751 static int
tcp6_usr_accept(struct socket * so,struct sockaddr * sa)752 tcp6_usr_accept(struct socket *so, struct sockaddr *sa)
753 {
754 struct inpcb *inp;
755 struct tcpcb *tp;
756 int error = 0;
757
758 inp = sotoinpcb(so);
759 KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL"));
760 INP_WLOCK(inp);
761 if (inp->inp_flags & INP_DROPPED) {
762 INP_WUNLOCK(inp);
763 return (ECONNABORTED);
764 }
765 tp = intotcpcb(inp);
766
767 if (so->so_state & SS_ISDISCONNECTED) {
768 error = ECONNABORTED;
769 } else {
770 if (inp->inp_vflag & INP_IPV4) {
771 struct sockaddr_in sin = {
772 .sin_family = AF_INET,
773 .sin_len = sizeof(struct sockaddr_in),
774 .sin_port = inp->inp_fport,
775 .sin_addr = inp->inp_faddr,
776 };
777 in6_sin_2_v4mapsin6(&sin, (struct sockaddr_in6 *)sa);
778 } else {
779 *(struct sockaddr_in6 *)sa = (struct sockaddr_in6 ){
780 .sin6_family = AF_INET6,
781 .sin6_len = sizeof(struct sockaddr_in6),
782 .sin6_port = inp->inp_fport,
783 .sin6_addr = inp->in6p_faddr,
784 };
785 /* XXX: should catch errors */
786 (void)sa6_recoverscope((struct sockaddr_in6 *)sa);
787 }
788 }
789
790 tcp_bblog_pru(tp, PRU_ACCEPT, error);
791 TCP_PROBE2(debug__user, tp, PRU_ACCEPT);
792 INP_WUNLOCK(inp);
793
794 return (error);
795 }
796 #endif /* INET6 */
797
798 /*
799 * Mark the connection as being incapable of further output.
800 */
801 static int
tcp_usr_shutdown(struct socket * so,enum shutdown_how how)802 tcp_usr_shutdown(struct socket *so, enum shutdown_how how)
803 {
804 struct epoch_tracker et;
805 struct inpcb *inp = sotoinpcb(so);
806 struct tcpcb *tp = intotcpcb(inp);
807 int error = 0;
808
809 SOCK_LOCK(so);
810 if (SOLISTENING(so)) {
811 if (how != SHUT_WR) {
812 so->so_error = ECONNABORTED;
813 solisten_wakeup(so); /* unlocks so */
814 } else
815 SOCK_UNLOCK(so);
816 return (ENOTCONN);
817 } else if ((so->so_state &
818 (SS_ISCONNECTED | SS_ISCONNECTING | SS_ISDISCONNECTING)) == 0) {
819 SOCK_UNLOCK(so);
820 return (ENOTCONN);
821 }
822 SOCK_UNLOCK(so);
823
824 switch (how) {
825 case SHUT_RD:
826 sorflush(so);
827 break;
828 case SHUT_RDWR:
829 sorflush(so);
830 /* FALLTHROUGH */
831 case SHUT_WR:
832 /*
833 * XXXGL: mimicing old soshutdown() here. But shouldn't we
834 * return ECONNRESEST for SHUT_RD as well?
835 */
836 INP_WLOCK(inp);
837 if (inp->inp_flags & INP_DROPPED) {
838 INP_WUNLOCK(inp);
839 return (ECONNRESET);
840 }
841
842 socantsendmore(so);
843 NET_EPOCH_ENTER(et);
844 tcp_usrclosed(tp);
845 error = tcp_output_nodrop(tp);
846 tcp_bblog_pru(tp, PRU_SHUTDOWN, error);
847 TCP_PROBE2(debug__user, tp, PRU_SHUTDOWN);
848 error = tcp_unlock_or_drop(tp, error);
849 NET_EPOCH_EXIT(et);
850 }
851 wakeup(&so->so_timeo);
852
853 return (error);
854 }
855
856 /*
857 * After a receive, possibly send window update to peer.
858 */
859 static int
tcp_usr_rcvd(struct socket * so,int flags)860 tcp_usr_rcvd(struct socket *so, int flags)
861 {
862 struct epoch_tracker et;
863 struct inpcb *inp;
864 struct tcpcb *tp;
865 int outrv = 0, error = 0;
866
867 inp = sotoinpcb(so);
868 KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL"));
869 INP_WLOCK(inp);
870 if (inp->inp_flags & INP_DROPPED) {
871 INP_WUNLOCK(inp);
872 return (ECONNRESET);
873 }
874 tp = intotcpcb(inp);
875
876 NET_EPOCH_ENTER(et);
877 /*
878 * For passively-created TFO connections, don't attempt a window
879 * update while still in SYN_RECEIVED as this may trigger an early
880 * SYN|ACK. It is preferable to have the SYN|ACK be sent along with
881 * application response data, or failing that, when the DELACK timer
882 * expires.
883 */
884 if ((tp->t_flags & TF_FASTOPEN) && (tp->t_state == TCPS_SYN_RECEIVED))
885 goto out;
886 #ifdef TCP_OFFLOAD
887 if (tp->t_flags & TF_TOE)
888 tcp_offload_rcvd(tp);
889 else
890 #endif
891 outrv = tcp_output_nodrop(tp);
892 out:
893 tcp_bblog_pru(tp, PRU_RCVD, error);
894 TCP_PROBE2(debug__user, tp, PRU_RCVD);
895 (void) tcp_unlock_or_drop(tp, outrv);
896 NET_EPOCH_EXIT(et);
897 return (error);
898 }
899
900 /*
901 * Do a send by putting data in output queue and updating urgent
902 * marker if URG set. Possibly send more data. Unlike the other
903 * pru_*() routines, the mbuf chains are our responsibility. We
904 * must either enqueue them or free them. The other pru_* routines
905 * generally are caller-frees.
906 */
907 static int
tcp_usr_send(struct socket * so,int flags,struct mbuf * m,struct sockaddr * nam,struct mbuf * control,struct thread * td)908 tcp_usr_send(struct socket *so, int flags, struct mbuf *m,
909 struct sockaddr *nam, struct mbuf *control, struct thread *td)
910 {
911 struct epoch_tracker et;
912 int error = 0;
913 struct inpcb *inp;
914 struct tcpcb *tp;
915 #ifdef INET
916 #ifdef INET6
917 struct sockaddr_in sin;
918 #endif
919 struct sockaddr_in *sinp;
920 #endif
921 #ifdef INET6
922 struct sockaddr_in6 *sin6;
923 int isipv6;
924 #endif
925 u_int8_t incflagsav;
926 u_char vflagsav;
927 bool restoreflags;
928
929 inp = sotoinpcb(so);
930 KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL"));
931 INP_WLOCK(inp);
932 if (inp->inp_flags & INP_DROPPED) {
933 if (m != NULL && (flags & PRUS_NOTREADY) == 0)
934 m_freem(m);
935 INP_WUNLOCK(inp);
936 return (ECONNRESET);
937 }
938 tp = intotcpcb(inp);
939
940 vflagsav = inp->inp_vflag;
941 incflagsav = inp->inp_inc.inc_flags;
942 restoreflags = false;
943
944 NET_EPOCH_ENTER(et);
945 if (control != NULL) {
946 /* TCP doesn't do control messages (rights, creds, etc) */
947 if (control->m_len > 0) {
948 m_freem(control);
949 error = EINVAL;
950 goto out;
951 }
952 m_freem(control); /* empty control, just free it */
953 }
954
955 if ((flags & PRUS_OOB) != 0 &&
956 (error = tcp_pru_options_support(tp, PRUS_OOB)) != 0)
957 goto out;
958
959 if (nam != NULL && tp->t_state < TCPS_SYN_SENT) {
960 if (tp->t_state == TCPS_LISTEN) {
961 error = EINVAL;
962 goto out;
963 }
964 switch (nam->sa_family) {
965 #ifdef INET
966 case AF_INET:
967 sinp = (struct sockaddr_in *)nam;
968 if (sinp->sin_len != sizeof(struct sockaddr_in)) {
969 error = EINVAL;
970 goto out;
971 }
972 if ((inp->inp_vflag & INP_IPV6) != 0) {
973 error = EAFNOSUPPORT;
974 goto out;
975 }
976 if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
977 error = EAFNOSUPPORT;
978 goto out;
979 }
980 if (ntohl(sinp->sin_addr.s_addr) == INADDR_BROADCAST) {
981 error = EACCES;
982 goto out;
983 }
984 if ((error = prison_remote_ip4(td->td_ucred,
985 &sinp->sin_addr)))
986 goto out;
987 #ifdef INET6
988 isipv6 = 0;
989 #endif
990 break;
991 #endif /* INET */
992 #ifdef INET6
993 case AF_INET6:
994 sin6 = (struct sockaddr_in6 *)nam;
995 if (sin6->sin6_len != sizeof(*sin6)) {
996 error = EINVAL;
997 goto out;
998 }
999 if ((inp->inp_vflag & INP_IPV6PROTO) == 0) {
1000 error = EAFNOSUPPORT;
1001 goto out;
1002 }
1003 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
1004 error = EAFNOSUPPORT;
1005 goto out;
1006 }
1007 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
1008 #ifdef INET
1009 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
1010 error = EINVAL;
1011 goto out;
1012 }
1013 if ((inp->inp_vflag & INP_IPV4) == 0) {
1014 error = EAFNOSUPPORT;
1015 goto out;
1016 }
1017 restoreflags = true;
1018 inp->inp_vflag &= ~INP_IPV6;
1019 sinp = &sin;
1020 in6_sin6_2_sin(sinp, sin6);
1021 if (IN_MULTICAST(
1022 ntohl(sinp->sin_addr.s_addr))) {
1023 error = EAFNOSUPPORT;
1024 goto out;
1025 }
1026 if ((error = prison_remote_ip4(td->td_ucred,
1027 &sinp->sin_addr)))
1028 goto out;
1029 isipv6 = 0;
1030 #else /* !INET */
1031 error = EAFNOSUPPORT;
1032 goto out;
1033 #endif /* INET */
1034 } else {
1035 if ((inp->inp_vflag & INP_IPV6) == 0) {
1036 error = EAFNOSUPPORT;
1037 goto out;
1038 }
1039 restoreflags = true;
1040 inp->inp_vflag &= ~INP_IPV4;
1041 inp->inp_inc.inc_flags |= INC_ISIPV6;
1042 if ((error = prison_remote_ip6(td->td_ucred,
1043 &sin6->sin6_addr)))
1044 goto out;
1045 isipv6 = 1;
1046 }
1047 break;
1048 #endif /* INET6 */
1049 default:
1050 error = EAFNOSUPPORT;
1051 goto out;
1052 }
1053 }
1054 if (!(flags & PRUS_OOB)) {
1055 if (tp->t_acktime == 0)
1056 tp->t_acktime = ticks;
1057 sbappendstream(&so->so_snd, m, flags);
1058 m = NULL;
1059 if (nam && tp->t_state < TCPS_SYN_SENT) {
1060 KASSERT(tp->t_state == TCPS_CLOSED,
1061 ("%s: tp %p is listening", __func__, tp));
1062
1063 /*
1064 * Do implied connect if not yet connected,
1065 * initialize window to default value, and
1066 * initialize maxseg using peer's cached MSS.
1067 */
1068 #ifdef INET6
1069 if (isipv6)
1070 error = tcp6_connect(tp, sin6, td);
1071 #endif /* INET6 */
1072 #if defined(INET6) && defined(INET)
1073 else
1074 #endif
1075 #ifdef INET
1076 error = tcp_connect(tp, sinp, td);
1077 #endif
1078 /*
1079 * The bind operation in tcp_connect succeeded. We
1080 * no longer want to restore the flags if later
1081 * operations fail.
1082 */
1083 if (error == 0 || inp->inp_lport != 0)
1084 restoreflags = false;
1085
1086 if (error) {
1087 /* m is freed if PRUS_NOTREADY is unset. */
1088 sbflush(&so->so_snd);
1089 goto out;
1090 }
1091 if (tp->t_flags & TF_FASTOPEN)
1092 tcp_fastopen_connect(tp);
1093 else {
1094 tp->snd_wnd = TTCP_CLIENT_SND_WND;
1095 tcp_mss(tp, -1);
1096 }
1097 }
1098 if (flags & PRUS_EOF) {
1099 /*
1100 * Close the send side of the connection after
1101 * the data is sent.
1102 */
1103 socantsendmore(so);
1104 tcp_usrclosed(tp);
1105 }
1106 if (TCPS_HAVEESTABLISHED(tp->t_state) &&
1107 ((tp->t_flags2 & TF2_FBYTES_COMPLETE) == 0) &&
1108 (tp->t_fbyte_out == 0) &&
1109 (so->so_snd.sb_ccc > 0)) {
1110 tp->t_fbyte_out = ticks;
1111 if (tp->t_fbyte_out == 0)
1112 tp->t_fbyte_out = 1;
1113 if (tp->t_fbyte_out && tp->t_fbyte_in)
1114 tp->t_flags2 |= TF2_FBYTES_COMPLETE;
1115 }
1116 if (!(inp->inp_flags & INP_DROPPED) &&
1117 !(flags & PRUS_NOTREADY)) {
1118 if (flags & PRUS_MORETOCOME)
1119 tp->t_flags |= TF_MORETOCOME;
1120 error = tcp_output_nodrop(tp);
1121 if (flags & PRUS_MORETOCOME)
1122 tp->t_flags &= ~TF_MORETOCOME;
1123 }
1124 } else {
1125 /*
1126 * XXXRW: PRUS_EOF not implemented with PRUS_OOB?
1127 */
1128 SOCK_SENDBUF_LOCK(so);
1129 if (sbspace(&so->so_snd) < -512) {
1130 SOCK_SENDBUF_UNLOCK(so);
1131 error = ENOBUFS;
1132 goto out;
1133 }
1134 /*
1135 * According to RFC961 (Assigned Protocols),
1136 * the urgent pointer points to the last octet
1137 * of urgent data. We continue, however,
1138 * to consider it to indicate the first octet
1139 * of data past the urgent section.
1140 * Otherwise, snd_up should be one lower.
1141 */
1142 if (tp->t_acktime == 0)
1143 tp->t_acktime = ticks;
1144 sbappendstream_locked(&so->so_snd, m, flags);
1145 SOCK_SENDBUF_UNLOCK(so);
1146 m = NULL;
1147 if (nam && tp->t_state < TCPS_SYN_SENT) {
1148 /*
1149 * Do implied connect if not yet connected,
1150 * initialize window to default value, and
1151 * initialize maxseg using peer's cached MSS.
1152 */
1153
1154 /*
1155 * Not going to contemplate SYN|URG
1156 */
1157 if (tp->t_flags & TF_FASTOPEN)
1158 tp->t_flags &= ~TF_FASTOPEN;
1159 #ifdef INET6
1160 if (isipv6)
1161 error = tcp6_connect(tp, sin6, td);
1162 #endif /* INET6 */
1163 #if defined(INET6) && defined(INET)
1164 else
1165 #endif
1166 #ifdef INET
1167 error = tcp_connect(tp, sinp, td);
1168 #endif
1169 /*
1170 * The bind operation in tcp_connect succeeded. We
1171 * no longer want to restore the flags if later
1172 * operations fail.
1173 */
1174 if (error == 0 || inp->inp_lport != 0)
1175 restoreflags = false;
1176
1177 if (error != 0) {
1178 /* m is freed if PRUS_NOTREADY is unset. */
1179 sbflush(&so->so_snd);
1180 goto out;
1181 }
1182 tp->snd_wnd = TTCP_CLIENT_SND_WND;
1183 tcp_mss(tp, -1);
1184 }
1185 tp->snd_up = tp->snd_una + sbavail(&so->so_snd);
1186 if ((flags & PRUS_NOTREADY) == 0) {
1187 tp->t_flags |= TF_FORCEDATA;
1188 error = tcp_output_nodrop(tp);
1189 tp->t_flags &= ~TF_FORCEDATA;
1190 }
1191 }
1192 TCP_LOG_EVENT(tp, NULL,
1193 &inp->inp_socket->so_rcv,
1194 &inp->inp_socket->so_snd,
1195 TCP_LOG_USERSEND, error,
1196 0, NULL, false);
1197
1198 out:
1199 /*
1200 * In case of PRUS_NOTREADY, the caller or tcp_usr_ready() is
1201 * responsible for freeing memory.
1202 */
1203 if (m != NULL && (flags & PRUS_NOTREADY) == 0)
1204 m_freem(m);
1205
1206 /*
1207 * If the request was unsuccessful and we changed flags,
1208 * restore the original flags.
1209 */
1210 if (error != 0 && restoreflags) {
1211 inp->inp_vflag = vflagsav;
1212 inp->inp_inc.inc_flags = incflagsav;
1213 }
1214 tcp_bblog_pru(tp, (flags & PRUS_OOB) ? PRU_SENDOOB :
1215 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND), error);
1216 TCP_PROBE2(debug__user, tp, (flags & PRUS_OOB) ? PRU_SENDOOB :
1217 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
1218 error = tcp_unlock_or_drop(tp, error);
1219 NET_EPOCH_EXIT(et);
1220 return (error);
1221 }
1222
1223 static int
tcp_usr_ready(struct socket * so,struct mbuf * m,int count)1224 tcp_usr_ready(struct socket *so, struct mbuf *m, int count)
1225 {
1226 struct epoch_tracker et;
1227 struct inpcb *inp;
1228 struct tcpcb *tp;
1229 int error;
1230
1231 inp = sotoinpcb(so);
1232 INP_WLOCK(inp);
1233 if (inp->inp_flags & INP_DROPPED) {
1234 INP_WUNLOCK(inp);
1235 mb_free_notready(m, count);
1236 return (ECONNRESET);
1237 }
1238 tp = intotcpcb(inp);
1239
1240 SOCK_SENDBUF_LOCK(so);
1241 error = sbready(&so->so_snd, m, count);
1242 SOCK_SENDBUF_UNLOCK(so);
1243 if (error) {
1244 INP_WUNLOCK(inp);
1245 return (error);
1246 }
1247 NET_EPOCH_ENTER(et);
1248 error = tcp_output_unlock(tp);
1249 NET_EPOCH_EXIT(et);
1250
1251 return (error);
1252 }
1253
1254 /*
1255 * Abort the TCP. Drop the connection abruptly.
1256 */
1257 static void
tcp_usr_abort(struct socket * so)1258 tcp_usr_abort(struct socket *so)
1259 {
1260 struct inpcb *inp;
1261 struct tcpcb *tp;
1262 struct epoch_tracker et;
1263
1264 inp = sotoinpcb(so);
1265 KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL"));
1266
1267 NET_EPOCH_ENTER(et);
1268 INP_WLOCK(inp);
1269 KASSERT(inp->inp_socket != NULL,
1270 ("tcp_usr_abort: inp_socket == NULL"));
1271
1272 /*
1273 * If we still have full TCP state, and we're not dropped, drop.
1274 */
1275 if (!(inp->inp_flags & INP_DROPPED)) {
1276 tp = intotcpcb(inp);
1277 tp = tcp_drop(tp, ECONNABORTED);
1278 if (tp == NULL)
1279 goto dropped;
1280 tcp_bblog_pru(tp, PRU_ABORT, 0);
1281 TCP_PROBE2(debug__user, tp, PRU_ABORT);
1282 }
1283 if (!(inp->inp_flags & INP_DROPPED)) {
1284 soref(so);
1285 inp->inp_flags |= INP_SOCKREF;
1286 }
1287 INP_WUNLOCK(inp);
1288 dropped:
1289 NET_EPOCH_EXIT(et);
1290 }
1291
1292 /*
1293 * TCP socket is closed. Start friendly disconnect.
1294 */
1295 static void
tcp_usr_close(struct socket * so)1296 tcp_usr_close(struct socket *so)
1297 {
1298 struct inpcb *inp;
1299 struct tcpcb *tp;
1300 struct epoch_tracker et;
1301
1302 inp = sotoinpcb(so);
1303 KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL"));
1304
1305 NET_EPOCH_ENTER(et);
1306 INP_WLOCK(inp);
1307 KASSERT(inp->inp_socket != NULL,
1308 ("tcp_usr_close: inp_socket == NULL"));
1309
1310 /*
1311 * If we are still connected and we're not dropped, initiate
1312 * a disconnect.
1313 */
1314 if (!(inp->inp_flags & INP_DROPPED)) {
1315 tp = intotcpcb(inp);
1316 if (tp->t_state != TCPS_TIME_WAIT) {
1317 tp->t_flags |= TF_CLOSED;
1318 tcp_disconnect(tp);
1319 tcp_bblog_pru(tp, PRU_CLOSE, 0);
1320 TCP_PROBE2(debug__user, tp, PRU_CLOSE);
1321 }
1322 }
1323 if (!(inp->inp_flags & INP_DROPPED)) {
1324 soref(so);
1325 inp->inp_flags |= INP_SOCKREF;
1326 }
1327 INP_WUNLOCK(inp);
1328 NET_EPOCH_EXIT(et);
1329 }
1330
1331 static int
tcp_pru_options_support(struct tcpcb * tp,int flags)1332 tcp_pru_options_support(struct tcpcb *tp, int flags)
1333 {
1334 /*
1335 * If the specific TCP stack has a pru_options
1336 * specified then it does not always support
1337 * all the PRU_XX options and we must ask it.
1338 * If the function is not specified then all
1339 * of the PRU_XX options are supported.
1340 */
1341 int ret = 0;
1342
1343 if (tp->t_fb->tfb_pru_options) {
1344 ret = (*tp->t_fb->tfb_pru_options)(tp, flags);
1345 }
1346 return (ret);
1347 }
1348
1349 /*
1350 * Receive out-of-band data.
1351 */
1352 static int
tcp_usr_rcvoob(struct socket * so,struct mbuf * m,int flags)1353 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags)
1354 {
1355 int error = 0;
1356 struct inpcb *inp;
1357 struct tcpcb *tp;
1358
1359 inp = sotoinpcb(so);
1360 KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL"));
1361 INP_WLOCK(inp);
1362 if (inp->inp_flags & INP_DROPPED) {
1363 INP_WUNLOCK(inp);
1364 return (ECONNRESET);
1365 }
1366 tp = intotcpcb(inp);
1367
1368 error = tcp_pru_options_support(tp, PRUS_OOB);
1369 if (error) {
1370 goto out;
1371 }
1372 if ((so->so_oobmark == 0 &&
1373 (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) ||
1374 so->so_options & SO_OOBINLINE ||
1375 tp->t_oobflags & TCPOOB_HADDATA) {
1376 error = EINVAL;
1377 goto out;
1378 }
1379 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
1380 error = EWOULDBLOCK;
1381 goto out;
1382 }
1383 m->m_len = 1;
1384 *mtod(m, caddr_t) = tp->t_iobc;
1385 if ((flags & MSG_PEEK) == 0)
1386 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
1387
1388 out:
1389 tcp_bblog_pru(tp, PRU_RCVOOB, error);
1390 TCP_PROBE2(debug__user, tp, PRU_RCVOOB);
1391 INP_WUNLOCK(inp);
1392 return (error);
1393 }
1394
1395 #ifdef INET
1396 struct protosw tcp_protosw = {
1397 .pr_type = SOCK_STREAM,
1398 .pr_protocol = IPPROTO_TCP,
1399 .pr_flags = PR_CONNREQUIRED | PR_IMPLOPCL | PR_WANTRCVD |
1400 PR_CAPATTACH,
1401 .pr_ctloutput = tcp_ctloutput,
1402 .pr_abort = tcp_usr_abort,
1403 .pr_accept = tcp_usr_accept,
1404 .pr_attach = tcp_usr_attach,
1405 .pr_bind = tcp_usr_bind,
1406 .pr_connect = tcp_usr_connect,
1407 .pr_control = in_control,
1408 .pr_detach = tcp_usr_detach,
1409 .pr_disconnect = tcp_usr_disconnect,
1410 .pr_listen = tcp_usr_listen,
1411 .pr_peeraddr = in_getpeeraddr,
1412 .pr_rcvd = tcp_usr_rcvd,
1413 .pr_rcvoob = tcp_usr_rcvoob,
1414 .pr_send = tcp_usr_send,
1415 .pr_ready = tcp_usr_ready,
1416 .pr_shutdown = tcp_usr_shutdown,
1417 .pr_sockaddr = in_getsockaddr,
1418 .pr_sosetlabel = in_pcbsosetlabel,
1419 .pr_close = tcp_usr_close,
1420 };
1421 #endif /* INET */
1422
1423 #ifdef INET6
1424 struct protosw tcp6_protosw = {
1425 .pr_type = SOCK_STREAM,
1426 .pr_protocol = IPPROTO_TCP,
1427 .pr_flags = PR_CONNREQUIRED | PR_IMPLOPCL |PR_WANTRCVD |
1428 PR_CAPATTACH,
1429 .pr_ctloutput = tcp_ctloutput,
1430 .pr_abort = tcp_usr_abort,
1431 .pr_accept = tcp6_usr_accept,
1432 .pr_attach = tcp_usr_attach,
1433 .pr_bind = tcp6_usr_bind,
1434 .pr_connect = tcp6_usr_connect,
1435 .pr_control = in6_control,
1436 .pr_detach = tcp_usr_detach,
1437 .pr_disconnect = tcp_usr_disconnect,
1438 .pr_listen = tcp6_usr_listen,
1439 .pr_peeraddr = in6_mapped_peeraddr,
1440 .pr_rcvd = tcp_usr_rcvd,
1441 .pr_rcvoob = tcp_usr_rcvoob,
1442 .pr_send = tcp_usr_send,
1443 .pr_ready = tcp_usr_ready,
1444 .pr_shutdown = tcp_usr_shutdown,
1445 .pr_sockaddr = in6_mapped_sockaddr,
1446 .pr_sosetlabel = in_pcbsosetlabel,
1447 .pr_close = tcp_usr_close,
1448 };
1449 #endif /* INET6 */
1450
1451 #ifdef INET
1452 /*
1453 * Common subroutine to open a TCP connection to remote host specified
1454 * by struct sockaddr_in. Call in_pcbconnect() to choose local host address
1455 * and assign a local port number and install the inpcb into the hash.
1456 * Initialize connection parameters and enter SYN-SENT state.
1457 */
1458 static int
tcp_connect(struct tcpcb * tp,struct sockaddr_in * sin,struct thread * td)1459 tcp_connect(struct tcpcb *tp, struct sockaddr_in *sin, struct thread *td)
1460 {
1461 struct inpcb *inp = tptoinpcb(tp);
1462 struct socket *so = tptosocket(tp);
1463 int error;
1464
1465 NET_EPOCH_ASSERT();
1466 INP_WLOCK_ASSERT(inp);
1467
1468 if (__predict_false((so->so_state &
1469 (SS_ISCONNECTING | SS_ISCONNECTED | SS_ISDISCONNECTING |
1470 SS_ISDISCONNECTED)) != 0))
1471 return (EISCONN);
1472
1473 INP_HASH_WLOCK(&V_tcbinfo);
1474 error = in_pcbconnect(inp, sin, td->td_ucred);
1475 INP_HASH_WUNLOCK(&V_tcbinfo);
1476 if (error != 0)
1477 return (error);
1478
1479 /*
1480 * Compute window scaling to request:
1481 * Scale to fit into sweet spot. See tcp_syncache.c.
1482 * XXX: This should move to tcp_output().
1483 */
1484 while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1485 (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1486 tp->request_r_scale++;
1487
1488 soisconnecting(so);
1489 TCPSTAT_INC(tcps_connattempt);
1490 tcp_state_change(tp, TCPS_SYN_SENT);
1491 tp->iss = tcp_new_isn(&inp->inp_inc);
1492 if (tp->t_flags & TF_REQ_TSTMP)
1493 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc);
1494 tcp_sendseqinit(tp);
1495
1496 return (0);
1497 }
1498 #endif /* INET */
1499
1500 #ifdef INET6
1501 static int
tcp6_connect(struct tcpcb * tp,struct sockaddr_in6 * sin6,struct thread * td)1502 tcp6_connect(struct tcpcb *tp, struct sockaddr_in6 *sin6, struct thread *td)
1503 {
1504 struct inpcb *inp = tptoinpcb(tp);
1505 struct socket *so = tptosocket(tp);
1506 int error;
1507
1508 NET_EPOCH_ASSERT();
1509 INP_WLOCK_ASSERT(inp);
1510
1511 if (__predict_false((so->so_state &
1512 (SS_ISCONNECTING | SS_ISCONNECTED)) != 0))
1513 return (EISCONN);
1514
1515 INP_HASH_WLOCK(&V_tcbinfo);
1516 error = in6_pcbconnect(inp, sin6, td->td_ucred, true);
1517 INP_HASH_WUNLOCK(&V_tcbinfo);
1518 if (error != 0)
1519 return (error);
1520
1521 /* Compute window scaling to request. */
1522 while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1523 (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1524 tp->request_r_scale++;
1525
1526 soisconnecting(so);
1527 TCPSTAT_INC(tcps_connattempt);
1528 tcp_state_change(tp, TCPS_SYN_SENT);
1529 tp->iss = tcp_new_isn(&inp->inp_inc);
1530 if (tp->t_flags & TF_REQ_TSTMP)
1531 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc);
1532 tcp_sendseqinit(tp);
1533
1534 return (0);
1535 }
1536 #endif /* INET6 */
1537
1538 /*
1539 * Export TCP internal state information via a struct tcp_info, based on the
1540 * Linux 2.6 API. Not ABI compatible as our constants are mapped differently
1541 * (TCP state machine, etc). We export all information using FreeBSD-native
1542 * constants -- for example, the numeric values for tcpi_state will differ
1543 * from Linux.
1544 */
1545 void
tcp_fill_info(const struct tcpcb * tp,struct tcp_info * ti)1546 tcp_fill_info(const struct tcpcb *tp, struct tcp_info *ti)
1547 {
1548
1549 INP_LOCK_ASSERT(tptoinpcb(tp));
1550 bzero(ti, sizeof(*ti));
1551
1552 ti->tcpi_state = tp->t_state;
1553 if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP))
1554 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS;
1555 if (tp->t_flags & TF_SACK_PERMIT)
1556 ti->tcpi_options |= TCPI_OPT_SACK;
1557 if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) {
1558 ti->tcpi_options |= TCPI_OPT_WSCALE;
1559 ti->tcpi_snd_wscale = tp->snd_scale;
1560 ti->tcpi_rcv_wscale = tp->rcv_scale;
1561 }
1562 switch (tp->t_flags2 & (TF2_ECN_PERMIT | TF2_ACE_PERMIT)) {
1563 case TF2_ECN_PERMIT:
1564 ti->tcpi_options |= TCPI_OPT_ECN;
1565 break;
1566 case TF2_ACE_PERMIT:
1567 /* FALLTHROUGH */
1568 case TF2_ECN_PERMIT | TF2_ACE_PERMIT:
1569 ti->tcpi_options |= TCPI_OPT_ACE;
1570 break;
1571 default:
1572 break;
1573 }
1574 if (tp->t_flags & TF_FASTOPEN)
1575 ti->tcpi_options |= TCPI_OPT_TFO;
1576
1577 ti->tcpi_rto = tp->t_rxtcur * tick;
1578 ti->tcpi_last_data_recv = ((uint32_t)ticks - tp->t_rcvtime) * tick;
1579 ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT;
1580 ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT;
1581
1582 ti->tcpi_snd_ssthresh = tp->snd_ssthresh;
1583 ti->tcpi_snd_cwnd = tp->snd_cwnd;
1584
1585 /*
1586 * FreeBSD-specific extension fields for tcp_info.
1587 */
1588 ti->tcpi_rcv_space = tp->rcv_wnd;
1589 ti->tcpi_rcv_nxt = tp->rcv_nxt;
1590 ti->tcpi_snd_wnd = tp->snd_wnd;
1591 ti->tcpi_snd_bwnd = 0; /* Unused, kept for compat. */
1592 ti->tcpi_snd_nxt = tp->snd_nxt;
1593 ti->tcpi_snd_mss = tp->t_maxseg;
1594 ti->tcpi_rcv_mss = tp->t_maxseg;
1595 ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack;
1596 ti->tcpi_rcv_ooopack = tp->t_rcvoopack;
1597 ti->tcpi_snd_zerowin = tp->t_sndzerowin;
1598 ti->tcpi_snd_una = tp->snd_una;
1599 ti->tcpi_snd_max = tp->snd_max;
1600 ti->tcpi_rcv_numsacks = tp->rcv_numsacks;
1601 ti->tcpi_rcv_adv = tp->rcv_adv;
1602 ti->tcpi_dupacks = tp->t_dupacks;
1603 ti->tcpi_rttmin = tp->t_rttlow;
1604 #ifdef TCP_OFFLOAD
1605 if (tp->t_flags & TF_TOE) {
1606 ti->tcpi_options |= TCPI_OPT_TOE;
1607 tcp_offload_tcp_info(tp, ti);
1608 }
1609 #endif
1610 /*
1611 * AccECN related counters.
1612 */
1613 if ((tp->t_flags2 & (TF2_ECN_PERMIT | TF2_ACE_PERMIT)) ==
1614 (TF2_ECN_PERMIT | TF2_ACE_PERMIT))
1615 /*
1616 * Internal counter starts at 5 for AccECN
1617 * but 0 for RFC3168 ECN.
1618 */
1619 ti->tcpi_delivered_ce = tp->t_scep - 5;
1620 else
1621 ti->tcpi_delivered_ce = tp->t_scep;
1622 ti->tcpi_received_ce = tp->t_rcep;
1623 }
1624
1625 /*
1626 * tcp_ctloutput() must drop the inpcb lock before performing copyin on
1627 * socket option arguments. When it re-acquires the lock after the copy, it
1628 * has to revalidate that the connection is still valid for the socket
1629 * option.
1630 */
1631 #define INP_WLOCK_RECHECK_CLEANUP(inp, cleanup) do { \
1632 INP_WLOCK(inp); \
1633 if (inp->inp_flags & INP_DROPPED) { \
1634 INP_WUNLOCK(inp); \
1635 cleanup; \
1636 return (ECONNRESET); \
1637 } \
1638 tp = intotcpcb(inp); \
1639 } while(0)
1640 #define INP_WLOCK_RECHECK(inp) INP_WLOCK_RECHECK_CLEANUP((inp), /* noop */)
1641
1642 int
tcp_ctloutput_set(struct inpcb * inp,struct sockopt * sopt)1643 tcp_ctloutput_set(struct inpcb *inp, struct sockopt *sopt)
1644 {
1645 struct socket *so = inp->inp_socket;
1646 struct tcpcb *tp = intotcpcb(inp);
1647 int error = 0;
1648
1649 MPASS(sopt->sopt_dir == SOPT_SET);
1650 INP_WLOCK_ASSERT(inp);
1651 KASSERT((inp->inp_flags & INP_DROPPED) == 0,
1652 ("inp_flags == %x", inp->inp_flags));
1653 KASSERT(so != NULL, ("inp_socket == NULL"));
1654
1655 if (sopt->sopt_level != IPPROTO_TCP) {
1656 INP_WUNLOCK(inp);
1657 #ifdef INET6
1658 if (inp->inp_vflag & INP_IPV6PROTO)
1659 error = ip6_ctloutput(so, sopt);
1660 #endif
1661 #if defined(INET6) && defined(INET)
1662 else
1663 #endif
1664 #ifdef INET
1665 error = ip_ctloutput(so, sopt);
1666 #endif
1667 /*
1668 * When an IP-level socket option affects TCP, pass control
1669 * down to stack tfb_tcp_ctloutput, otherwise return what
1670 * IP level returned.
1671 */
1672 switch (sopt->sopt_level) {
1673 #ifdef INET6
1674 case IPPROTO_IPV6:
1675 if ((inp->inp_vflag & INP_IPV6PROTO) == 0)
1676 return (error);
1677 switch (sopt->sopt_name) {
1678 case IPV6_TCLASS:
1679 /* Notify tcp stacks that care (e.g. RACK). */
1680 break;
1681 case IPV6_USE_MIN_MTU:
1682 /* Update t_maxseg accordingly. */
1683 break;
1684 default:
1685 return (error);
1686 }
1687 break;
1688 #endif
1689 #ifdef INET
1690 case IPPROTO_IP:
1691 switch (sopt->sopt_name) {
1692 case IP_TOS:
1693 inp->inp_ip_tos &= ~IPTOS_ECN_MASK;
1694 break;
1695 case IP_TTL:
1696 /* Notify tcp stacks that care (e.g. RACK). */
1697 break;
1698 default:
1699 return (error);
1700 }
1701 break;
1702 #endif
1703 default:
1704 return (error);
1705 }
1706 INP_WLOCK_RECHECK(inp);
1707 } else if (sopt->sopt_name == TCP_FUNCTION_BLK) {
1708 /*
1709 * Protect the TCP option TCP_FUNCTION_BLK so
1710 * that a sub-function can *never* overwrite this.
1711 */
1712 struct tcp_function_set fsn;
1713 struct tcp_function_block *blk;
1714 void *ptr = NULL;
1715
1716 INP_WUNLOCK(inp);
1717 error = sooptcopyin(sopt, &fsn, sizeof fsn, sizeof fsn);
1718 if (error)
1719 return (error);
1720
1721 INP_WLOCK_RECHECK(inp);
1722
1723 blk = find_and_ref_tcp_functions(&fsn);
1724 if (blk == NULL) {
1725 INP_WUNLOCK(inp);
1726 return (ENOENT);
1727 }
1728 if (tp->t_fb == blk) {
1729 /* You already have this */
1730 refcount_release(&blk->tfb_refcnt);
1731 INP_WUNLOCK(inp);
1732 return (0);
1733 }
1734 if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) {
1735 refcount_release(&blk->tfb_refcnt);
1736 INP_WUNLOCK(inp);
1737 return (ENOENT);
1738 }
1739 error = (*blk->tfb_tcp_handoff_ok)(tp);
1740 if (error) {
1741 refcount_release(&blk->tfb_refcnt);
1742 INP_WUNLOCK(inp);
1743 return (error);
1744 }
1745 /*
1746 * Ensure the new stack takes ownership with a
1747 * clean slate on peak rate threshold.
1748 */
1749 if (tp->t_fb->tfb_tcp_timer_stop_all != NULL)
1750 tp->t_fb->tfb_tcp_timer_stop_all(tp);
1751 if (blk->tfb_tcp_fb_init) {
1752 error = (*blk->tfb_tcp_fb_init)(tp, &ptr);
1753 if (error) {
1754 /*
1755 * Release the ref count the lookup
1756 * acquired.
1757 */
1758 refcount_release(&blk->tfb_refcnt);
1759 /*
1760 * Now there is a chance that the
1761 * init() function mucked with some
1762 * things before it failed, such as
1763 * hpts or inp_flags2 or timer granularity.
1764 * It should not of, but lets give the old
1765 * stack a chance to reset to a known good state.
1766 */
1767 if (tp->t_fb->tfb_switch_failed) {
1768 (*tp->t_fb->tfb_switch_failed)(tp);
1769 }
1770 goto err_out;
1771 }
1772 }
1773 if (tp->t_fb->tfb_tcp_fb_fini) {
1774 struct epoch_tracker et;
1775 /*
1776 * Tell the stack to cleanup with 0 i.e.
1777 * the tcb is not going away.
1778 */
1779 NET_EPOCH_ENTER(et);
1780 (*tp->t_fb->tfb_tcp_fb_fini)(tp, 0);
1781 NET_EPOCH_EXIT(et);
1782 }
1783 /*
1784 * Release the old refcnt, the
1785 * lookup acquired a ref on the
1786 * new one already.
1787 */
1788 refcount_release(&tp->t_fb->tfb_refcnt);
1789 /*
1790 * Set in the new stack.
1791 */
1792 tp->t_fb = blk;
1793 tp->t_fb_ptr = ptr;
1794 #ifdef TCP_OFFLOAD
1795 if (tp->t_flags & TF_TOE) {
1796 tcp_offload_ctloutput(tp, sopt->sopt_dir,
1797 sopt->sopt_name);
1798 }
1799 #endif
1800 err_out:
1801 INP_WUNLOCK(inp);
1802 return (error);
1803
1804 }
1805
1806 /* Pass in the INP locked, callee must unlock it. */
1807 return (tp->t_fb->tfb_tcp_ctloutput(tp, sopt));
1808 }
1809
1810 static int
tcp_ctloutput_get(struct inpcb * inp,struct sockopt * sopt)1811 tcp_ctloutput_get(struct inpcb *inp, struct sockopt *sopt)
1812 {
1813 struct socket *so = inp->inp_socket;
1814 struct tcpcb *tp = intotcpcb(inp);
1815 int error = 0;
1816
1817 MPASS(sopt->sopt_dir == SOPT_GET);
1818 INP_WLOCK_ASSERT(inp);
1819 KASSERT((inp->inp_flags & INP_DROPPED) == 0,
1820 ("inp_flags == %x", inp->inp_flags));
1821 KASSERT(so != NULL, ("inp_socket == NULL"));
1822
1823 if (sopt->sopt_level != IPPROTO_TCP) {
1824 INP_WUNLOCK(inp);
1825 #ifdef INET6
1826 if (inp->inp_vflag & INP_IPV6PROTO)
1827 error = ip6_ctloutput(so, sopt);
1828 #endif /* INET6 */
1829 #if defined(INET6) && defined(INET)
1830 else
1831 #endif
1832 #ifdef INET
1833 error = ip_ctloutput(so, sopt);
1834 #endif
1835 return (error);
1836 }
1837 if (((sopt->sopt_name == TCP_FUNCTION_BLK) ||
1838 (sopt->sopt_name == TCP_FUNCTION_ALIAS))) {
1839 struct tcp_function_set fsn;
1840
1841 if (sopt->sopt_name == TCP_FUNCTION_ALIAS) {
1842 memset(&fsn, 0, sizeof(fsn));
1843 find_tcp_function_alias(tp->t_fb, &fsn);
1844 } else {
1845 strncpy(fsn.function_set_name,
1846 tp->t_fb->tfb_tcp_block_name,
1847 TCP_FUNCTION_NAME_LEN_MAX);
1848 fsn.function_set_name[TCP_FUNCTION_NAME_LEN_MAX - 1] = '\0';
1849 }
1850 fsn.pcbcnt = tp->t_fb->tfb_refcnt;
1851 INP_WUNLOCK(inp);
1852 error = sooptcopyout(sopt, &fsn, sizeof fsn);
1853 return (error);
1854 }
1855
1856 /* Pass in the INP locked, callee must unlock it. */
1857 return (tp->t_fb->tfb_tcp_ctloutput(tp, sopt));
1858 }
1859
1860 int
tcp_ctloutput(struct socket * so,struct sockopt * sopt)1861 tcp_ctloutput(struct socket *so, struct sockopt *sopt)
1862 {
1863 struct inpcb *inp;
1864
1865 inp = sotoinpcb(so);
1866 KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL"));
1867
1868 INP_WLOCK(inp);
1869 if (inp->inp_flags & INP_DROPPED) {
1870 INP_WUNLOCK(inp);
1871 return (ECONNRESET);
1872 }
1873 if (sopt->sopt_dir == SOPT_SET)
1874 return (tcp_ctloutput_set(inp, sopt));
1875 else if (sopt->sopt_dir == SOPT_GET)
1876 return (tcp_ctloutput_get(inp, sopt));
1877 else
1878 panic("%s: sopt_dir $%d", __func__, sopt->sopt_dir);
1879 }
1880
1881 /*
1882 * If this assert becomes untrue, we need to change the size of the buf
1883 * variable in tcp_default_ctloutput().
1884 */
1885 #ifdef CTASSERT
1886 CTASSERT(TCP_CA_NAME_MAX <= TCP_LOG_ID_LEN);
1887 CTASSERT(TCP_LOG_REASON_LEN <= TCP_LOG_ID_LEN);
1888 #endif
1889
1890 extern struct cc_algo newreno_cc_algo;
1891
1892 static int
tcp_set_cc_mod(struct inpcb * inp,struct sockopt * sopt)1893 tcp_set_cc_mod(struct inpcb *inp, struct sockopt *sopt)
1894 {
1895 struct cc_algo *algo;
1896 void *ptr = NULL;
1897 struct tcpcb *tp;
1898 struct cc_var cc_mem;
1899 char buf[TCP_CA_NAME_MAX];
1900 size_t mem_sz;
1901 int error;
1902
1903 INP_WUNLOCK(inp);
1904 error = sooptcopyin(sopt, buf, TCP_CA_NAME_MAX - 1, 1);
1905 if (error)
1906 return(error);
1907 buf[sopt->sopt_valsize] = '\0';
1908 CC_LIST_RLOCK();
1909 STAILQ_FOREACH(algo, &cc_list, entries) {
1910 if (strncmp(buf, algo->name,
1911 TCP_CA_NAME_MAX) == 0) {
1912 if (algo->flags & CC_MODULE_BEING_REMOVED) {
1913 /* We can't "see" modules being unloaded */
1914 continue;
1915 }
1916 break;
1917 }
1918 }
1919 if (algo == NULL) {
1920 CC_LIST_RUNLOCK();
1921 return(ESRCH);
1922 }
1923 /*
1924 * With a reference the algorithm cannot be removed
1925 * so we hold a reference through the change process.
1926 */
1927 cc_refer(algo);
1928 CC_LIST_RUNLOCK();
1929 if (algo->cb_init != NULL) {
1930 /* We can now pre-get the memory for the CC */
1931 mem_sz = (*algo->cc_data_sz)();
1932 if (mem_sz == 0) {
1933 goto no_mem_needed;
1934 }
1935 ptr = malloc(mem_sz, M_CC_MEM, M_WAITOK);
1936 } else {
1937 no_mem_needed:
1938 mem_sz = 0;
1939 ptr = NULL;
1940 }
1941 /*
1942 * Make sure its all clean and zero and also get
1943 * back the inplock.
1944 */
1945 memset(&cc_mem, 0, sizeof(cc_mem));
1946 INP_WLOCK(inp);
1947 if (inp->inp_flags & INP_DROPPED) {
1948 INP_WUNLOCK(inp);
1949 if (ptr)
1950 free(ptr, M_CC_MEM);
1951 /* Release our temp reference */
1952 CC_LIST_RLOCK();
1953 cc_release(algo);
1954 CC_LIST_RUNLOCK();
1955 return (ECONNRESET);
1956 }
1957 tp = intotcpcb(inp);
1958 if (ptr != NULL)
1959 memset(ptr, 0, mem_sz);
1960 cc_mem.tp = tp;
1961 /*
1962 * We once again hold a write lock over the tcb so it's
1963 * safe to do these things without ordering concerns.
1964 * Note here we init into stack memory.
1965 */
1966 if (algo->cb_init != NULL)
1967 error = algo->cb_init(&cc_mem, ptr);
1968 else
1969 error = 0;
1970 /*
1971 * The CC algorithms, when given their memory
1972 * should not fail we could in theory have a
1973 * KASSERT here.
1974 */
1975 if (error == 0) {
1976 /*
1977 * Touchdown, lets go ahead and move the
1978 * connection to the new CC module by
1979 * copying in the cc_mem after we call
1980 * the old ones cleanup (if any).
1981 */
1982 if (CC_ALGO(tp)->cb_destroy != NULL)
1983 CC_ALGO(tp)->cb_destroy(&tp->t_ccv);
1984 /* Detach the old CC from the tcpcb */
1985 cc_detach(tp);
1986 /* Copy in our temp memory that was inited */
1987 memcpy(&tp->t_ccv, &cc_mem, sizeof(struct cc_var));
1988 /* Now attach the new, which takes a reference */
1989 cc_attach(tp, algo);
1990 /* Ok now are we where we have gotten past any conn_init? */
1991 if (TCPS_HAVEESTABLISHED(tp->t_state) && (CC_ALGO(tp)->conn_init != NULL)) {
1992 /* Yep run the connection init for the new CC */
1993 CC_ALGO(tp)->conn_init(&tp->t_ccv);
1994 }
1995 } else if (ptr)
1996 free(ptr, M_CC_MEM);
1997 INP_WUNLOCK(inp);
1998 /* Now lets release our temp reference */
1999 CC_LIST_RLOCK();
2000 cc_release(algo);
2001 CC_LIST_RUNLOCK();
2002 return (error);
2003 }
2004
2005 int
tcp_default_ctloutput(struct tcpcb * tp,struct sockopt * sopt)2006 tcp_default_ctloutput(struct tcpcb *tp, struct sockopt *sopt)
2007 {
2008 struct inpcb *inp = tptoinpcb(tp);
2009 int error, opt, optval;
2010 u_int ui;
2011 struct tcp_info ti;
2012 #ifdef KERN_TLS
2013 struct tls_enable tls;
2014 struct socket *so = inp->inp_socket;
2015 #endif
2016 char *pbuf, buf[TCP_LOG_ID_LEN];
2017 #ifdef STATS
2018 struct statsblob *sbp;
2019 #endif
2020 size_t len;
2021
2022 INP_WLOCK_ASSERT(inp);
2023 KASSERT((inp->inp_flags & INP_DROPPED) == 0,
2024 ("inp_flags == %x", inp->inp_flags));
2025 KASSERT(inp->inp_socket != NULL, ("inp_socket == NULL"));
2026
2027 switch (sopt->sopt_level) {
2028 #ifdef INET6
2029 case IPPROTO_IPV6:
2030 MPASS(inp->inp_vflag & INP_IPV6PROTO);
2031 switch (sopt->sopt_name) {
2032 case IPV6_USE_MIN_MTU:
2033 tcp6_use_min_mtu(tp);
2034 /* FALLTHROUGH */
2035 }
2036 INP_WUNLOCK(inp);
2037 return (0);
2038 #endif
2039 #ifdef INET
2040 case IPPROTO_IP:
2041 INP_WUNLOCK(inp);
2042 return (0);
2043 #endif
2044 }
2045
2046 /*
2047 * For TCP_CCALGOOPT forward the control to CC module, for both
2048 * SOPT_SET and SOPT_GET.
2049 */
2050 switch (sopt->sopt_name) {
2051 case TCP_CCALGOOPT:
2052 INP_WUNLOCK(inp);
2053 if (sopt->sopt_valsize > CC_ALGOOPT_LIMIT)
2054 return (EINVAL);
2055 pbuf = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK | M_ZERO);
2056 error = sooptcopyin(sopt, pbuf, sopt->sopt_valsize,
2057 sopt->sopt_valsize);
2058 if (error) {
2059 free(pbuf, M_TEMP);
2060 return (error);
2061 }
2062 INP_WLOCK_RECHECK_CLEANUP(inp, free(pbuf, M_TEMP));
2063 if (CC_ALGO(tp)->ctl_output != NULL)
2064 error = CC_ALGO(tp)->ctl_output(&tp->t_ccv, sopt, pbuf);
2065 else
2066 error = ENOENT;
2067 INP_WUNLOCK(inp);
2068 if (error == 0 && sopt->sopt_dir == SOPT_GET)
2069 error = sooptcopyout(sopt, pbuf, sopt->sopt_valsize);
2070 free(pbuf, M_TEMP);
2071 return (error);
2072 }
2073
2074 switch (sopt->sopt_dir) {
2075 case SOPT_SET:
2076 switch (sopt->sopt_name) {
2077 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
2078 case TCP_MD5SIG:
2079 INP_WUNLOCK(inp);
2080 if (!TCPMD5_ENABLED())
2081 return (ENOPROTOOPT);
2082 error = TCPMD5_PCBCTL(inp, sopt);
2083 if (error)
2084 return (error);
2085 INP_WLOCK_RECHECK(inp);
2086 goto unlock_and_done;
2087 #endif /* IPSEC */
2088
2089 case TCP_NODELAY:
2090 case TCP_NOOPT:
2091 INP_WUNLOCK(inp);
2092 error = sooptcopyin(sopt, &optval, sizeof optval,
2093 sizeof optval);
2094 if (error)
2095 return (error);
2096
2097 INP_WLOCK_RECHECK(inp);
2098 switch (sopt->sopt_name) {
2099 case TCP_NODELAY:
2100 opt = TF_NODELAY;
2101 break;
2102 case TCP_NOOPT:
2103 opt = TF_NOOPT;
2104 break;
2105 default:
2106 opt = 0; /* dead code to fool gcc */
2107 break;
2108 }
2109
2110 if (optval)
2111 tp->t_flags |= opt;
2112 else
2113 tp->t_flags &= ~opt;
2114 unlock_and_done:
2115 #ifdef TCP_OFFLOAD
2116 if (tp->t_flags & TF_TOE) {
2117 tcp_offload_ctloutput(tp, sopt->sopt_dir,
2118 sopt->sopt_name);
2119 }
2120 #endif
2121 INP_WUNLOCK(inp);
2122 break;
2123
2124 case TCP_NOPUSH:
2125 INP_WUNLOCK(inp);
2126 error = sooptcopyin(sopt, &optval, sizeof optval,
2127 sizeof optval);
2128 if (error)
2129 return (error);
2130
2131 INP_WLOCK_RECHECK(inp);
2132 if (optval)
2133 tp->t_flags |= TF_NOPUSH;
2134 else if (tp->t_flags & TF_NOPUSH) {
2135 tp->t_flags &= ~TF_NOPUSH;
2136 if (TCPS_HAVEESTABLISHED(tp->t_state)) {
2137 struct epoch_tracker et;
2138
2139 NET_EPOCH_ENTER(et);
2140 error = tcp_output_nodrop(tp);
2141 NET_EPOCH_EXIT(et);
2142 }
2143 }
2144 goto unlock_and_done;
2145
2146 case TCP_REMOTE_UDP_ENCAPS_PORT:
2147 INP_WUNLOCK(inp);
2148 error = sooptcopyin(sopt, &optval, sizeof optval,
2149 sizeof optval);
2150 if (error)
2151 return (error);
2152 if ((optval < TCP_TUNNELING_PORT_MIN) ||
2153 (optval > TCP_TUNNELING_PORT_MAX)) {
2154 /* Its got to be in range */
2155 return (EINVAL);
2156 }
2157 if ((V_tcp_udp_tunneling_port == 0) && (optval != 0)) {
2158 /* You have to have enabled a UDP tunneling port first */
2159 return (EINVAL);
2160 }
2161 INP_WLOCK_RECHECK(inp);
2162 if (tp->t_state != TCPS_CLOSED) {
2163 /* You can't change after you are connected */
2164 error = EINVAL;
2165 } else {
2166 /* Ok we are all good set the port */
2167 tp->t_port = htons(optval);
2168 }
2169 goto unlock_and_done;
2170
2171 case TCP_MAXSEG:
2172 INP_WUNLOCK(inp);
2173 error = sooptcopyin(sopt, &optval, sizeof optval,
2174 sizeof optval);
2175 if (error)
2176 return (error);
2177
2178 INP_WLOCK_RECHECK(inp);
2179 if (optval > 0 && optval <= tp->t_maxseg &&
2180 optval + 40 >= V_tcp_minmss) {
2181 tp->t_maxseg = optval;
2182 if (tp->t_maxseg < V_tcp_mssdflt) {
2183 /*
2184 * The MSS is so small we should not process incoming
2185 * SACK's since we are subject to attack in such a
2186 * case.
2187 */
2188 tp->t_flags2 |= TF2_PROC_SACK_PROHIBIT;
2189 } else {
2190 tp->t_flags2 &= ~TF2_PROC_SACK_PROHIBIT;
2191 }
2192 } else
2193 error = EINVAL;
2194 goto unlock_and_done;
2195
2196 case TCP_INFO:
2197 INP_WUNLOCK(inp);
2198 error = EINVAL;
2199 break;
2200
2201 case TCP_STATS:
2202 INP_WUNLOCK(inp);
2203 #ifdef STATS
2204 error = sooptcopyin(sopt, &optval, sizeof optval,
2205 sizeof optval);
2206 if (error)
2207 return (error);
2208
2209 if (optval > 0)
2210 sbp = stats_blob_alloc(
2211 V_tcp_perconn_stats_dflt_tpl, 0);
2212 else
2213 sbp = NULL;
2214
2215 INP_WLOCK_RECHECK(inp);
2216 if ((tp->t_stats != NULL && sbp == NULL) ||
2217 (tp->t_stats == NULL && sbp != NULL)) {
2218 struct statsblob *t = tp->t_stats;
2219 tp->t_stats = sbp;
2220 sbp = t;
2221 }
2222 INP_WUNLOCK(inp);
2223
2224 stats_blob_destroy(sbp);
2225 #else
2226 return (EOPNOTSUPP);
2227 #endif /* !STATS */
2228 break;
2229
2230 case TCP_CONGESTION:
2231 error = tcp_set_cc_mod(inp, sopt);
2232 break;
2233
2234 case TCP_REUSPORT_LB_NUMA:
2235 INP_WUNLOCK(inp);
2236 error = sooptcopyin(sopt, &optval, sizeof(optval),
2237 sizeof(optval));
2238 INP_WLOCK_RECHECK(inp);
2239 if (!error)
2240 error = in_pcblbgroup_numa(inp, optval);
2241 INP_WUNLOCK(inp);
2242 break;
2243
2244 #ifdef KERN_TLS
2245 case TCP_TXTLS_ENABLE:
2246 INP_WUNLOCK(inp);
2247 error = ktls_copyin_tls_enable(sopt, &tls);
2248 if (error != 0)
2249 break;
2250 error = ktls_enable_tx(so, &tls);
2251 ktls_cleanup_tls_enable(&tls);
2252 break;
2253 case TCP_TXTLS_MODE:
2254 INP_WUNLOCK(inp);
2255 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
2256 if (error != 0)
2257 return (error);
2258
2259 INP_WLOCK_RECHECK(inp);
2260 error = ktls_set_tx_mode(so, ui);
2261 INP_WUNLOCK(inp);
2262 break;
2263 case TCP_RXTLS_ENABLE:
2264 INP_WUNLOCK(inp);
2265 error = ktls_copyin_tls_enable(sopt, &tls);
2266 if (error != 0)
2267 break;
2268 error = ktls_enable_rx(so, &tls);
2269 ktls_cleanup_tls_enable(&tls);
2270 break;
2271 #endif
2272 case TCP_MAXUNACKTIME:
2273 case TCP_KEEPIDLE:
2274 case TCP_KEEPINTVL:
2275 case TCP_KEEPINIT:
2276 INP_WUNLOCK(inp);
2277 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
2278 if (error)
2279 return (error);
2280
2281 if (ui > (UINT_MAX / hz)) {
2282 error = EINVAL;
2283 break;
2284 }
2285 ui *= hz;
2286
2287 INP_WLOCK_RECHECK(inp);
2288 switch (sopt->sopt_name) {
2289 case TCP_MAXUNACKTIME:
2290 tp->t_maxunacktime = ui;
2291 break;
2292
2293 case TCP_KEEPIDLE:
2294 tp->t_keepidle = ui;
2295 /*
2296 * XXX: better check current remaining
2297 * timeout and "merge" it with new value.
2298 */
2299 if ((tp->t_state > TCPS_LISTEN) &&
2300 (tp->t_state <= TCPS_CLOSING))
2301 tcp_timer_activate(tp, TT_KEEP,
2302 TP_KEEPIDLE(tp));
2303 break;
2304 case TCP_KEEPINTVL:
2305 tp->t_keepintvl = ui;
2306 if ((tp->t_state == TCPS_FIN_WAIT_2) &&
2307 (TP_MAXIDLE(tp) > 0))
2308 tcp_timer_activate(tp, TT_2MSL,
2309 TP_MAXIDLE(tp));
2310 break;
2311 case TCP_KEEPINIT:
2312 tp->t_keepinit = ui;
2313 if (tp->t_state == TCPS_SYN_RECEIVED ||
2314 tp->t_state == TCPS_SYN_SENT)
2315 tcp_timer_activate(tp, TT_KEEP,
2316 TP_KEEPINIT(tp));
2317 break;
2318 }
2319 goto unlock_and_done;
2320
2321 case TCP_KEEPCNT:
2322 INP_WUNLOCK(inp);
2323 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
2324 if (error)
2325 return (error);
2326
2327 INP_WLOCK_RECHECK(inp);
2328 tp->t_keepcnt = ui;
2329 if ((tp->t_state == TCPS_FIN_WAIT_2) &&
2330 (TP_MAXIDLE(tp) > 0))
2331 tcp_timer_activate(tp, TT_2MSL,
2332 TP_MAXIDLE(tp));
2333 goto unlock_and_done;
2334
2335 #ifdef TCPPCAP
2336 case TCP_PCAP_OUT:
2337 case TCP_PCAP_IN:
2338 INP_WUNLOCK(inp);
2339 error = sooptcopyin(sopt, &optval, sizeof optval,
2340 sizeof optval);
2341 if (error)
2342 return (error);
2343
2344 INP_WLOCK_RECHECK(inp);
2345 if (optval >= 0)
2346 tcp_pcap_set_sock_max(
2347 (sopt->sopt_name == TCP_PCAP_OUT) ?
2348 &(tp->t_outpkts) : &(tp->t_inpkts),
2349 optval);
2350 else
2351 error = EINVAL;
2352 goto unlock_and_done;
2353 #endif
2354
2355 case TCP_FASTOPEN: {
2356 struct tcp_fastopen tfo_optval;
2357
2358 INP_WUNLOCK(inp);
2359 if (!V_tcp_fastopen_client_enable &&
2360 !V_tcp_fastopen_server_enable)
2361 return (EPERM);
2362
2363 error = sooptcopyin(sopt, &tfo_optval,
2364 sizeof(tfo_optval), sizeof(int));
2365 if (error)
2366 return (error);
2367
2368 INP_WLOCK_RECHECK(inp);
2369 if ((tp->t_state != TCPS_CLOSED) &&
2370 (tp->t_state != TCPS_LISTEN)) {
2371 error = EINVAL;
2372 goto unlock_and_done;
2373 }
2374 if (tfo_optval.enable) {
2375 if (tp->t_state == TCPS_LISTEN) {
2376 if (!V_tcp_fastopen_server_enable) {
2377 error = EPERM;
2378 goto unlock_and_done;
2379 }
2380
2381 if (tp->t_tfo_pending == NULL)
2382 tp->t_tfo_pending =
2383 tcp_fastopen_alloc_counter();
2384 } else {
2385 /*
2386 * If a pre-shared key was provided,
2387 * stash it in the client cookie
2388 * field of the tcpcb for use during
2389 * connect.
2390 */
2391 if (sopt->sopt_valsize ==
2392 sizeof(tfo_optval)) {
2393 memcpy(tp->t_tfo_cookie.client,
2394 tfo_optval.psk,
2395 TCP_FASTOPEN_PSK_LEN);
2396 tp->t_tfo_client_cookie_len =
2397 TCP_FASTOPEN_PSK_LEN;
2398 }
2399 }
2400 tp->t_flags |= TF_FASTOPEN;
2401 } else
2402 tp->t_flags &= ~TF_FASTOPEN;
2403 goto unlock_and_done;
2404 }
2405
2406 #ifdef TCP_BLACKBOX
2407 case TCP_LOG:
2408 INP_WUNLOCK(inp);
2409 error = sooptcopyin(sopt, &optval, sizeof optval,
2410 sizeof optval);
2411 if (error)
2412 return (error);
2413
2414 INP_WLOCK_RECHECK(inp);
2415 error = tcp_log_state_change(tp, optval);
2416 goto unlock_and_done;
2417
2418 case TCP_LOGBUF:
2419 INP_WUNLOCK(inp);
2420 error = EINVAL;
2421 break;
2422
2423 case TCP_LOGID:
2424 INP_WUNLOCK(inp);
2425 error = sooptcopyin(sopt, buf, TCP_LOG_ID_LEN - 1, 0);
2426 if (error)
2427 break;
2428 buf[sopt->sopt_valsize] = '\0';
2429 INP_WLOCK_RECHECK(inp);
2430 error = tcp_log_set_id(tp, buf);
2431 /* tcp_log_set_id() unlocks the INP. */
2432 break;
2433
2434 case TCP_LOGDUMP:
2435 case TCP_LOGDUMPID:
2436 INP_WUNLOCK(inp);
2437 error =
2438 sooptcopyin(sopt, buf, TCP_LOG_REASON_LEN - 1, 0);
2439 if (error)
2440 break;
2441 buf[sopt->sopt_valsize] = '\0';
2442 INP_WLOCK_RECHECK(inp);
2443 if (sopt->sopt_name == TCP_LOGDUMP) {
2444 error = tcp_log_dump_tp_logbuf(tp, buf,
2445 M_WAITOK, true);
2446 INP_WUNLOCK(inp);
2447 } else {
2448 tcp_log_dump_tp_bucket_logbufs(tp, buf);
2449 /*
2450 * tcp_log_dump_tp_bucket_logbufs() drops the
2451 * INP lock.
2452 */
2453 }
2454 break;
2455 #endif
2456
2457 default:
2458 INP_WUNLOCK(inp);
2459 error = ENOPROTOOPT;
2460 break;
2461 }
2462 break;
2463
2464 case SOPT_GET:
2465 tp = intotcpcb(inp);
2466 switch (sopt->sopt_name) {
2467 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
2468 case TCP_MD5SIG:
2469 INP_WUNLOCK(inp);
2470 if (!TCPMD5_ENABLED())
2471 return (ENOPROTOOPT);
2472 error = TCPMD5_PCBCTL(inp, sopt);
2473 break;
2474 #endif
2475
2476 case TCP_NODELAY:
2477 optval = tp->t_flags & TF_NODELAY;
2478 INP_WUNLOCK(inp);
2479 error = sooptcopyout(sopt, &optval, sizeof optval);
2480 break;
2481 case TCP_MAXSEG:
2482 optval = tp->t_maxseg;
2483 INP_WUNLOCK(inp);
2484 error = sooptcopyout(sopt, &optval, sizeof optval);
2485 break;
2486 case TCP_REMOTE_UDP_ENCAPS_PORT:
2487 optval = ntohs(tp->t_port);
2488 INP_WUNLOCK(inp);
2489 error = sooptcopyout(sopt, &optval, sizeof optval);
2490 break;
2491 case TCP_NOOPT:
2492 optval = tp->t_flags & TF_NOOPT;
2493 INP_WUNLOCK(inp);
2494 error = sooptcopyout(sopt, &optval, sizeof optval);
2495 break;
2496 case TCP_NOPUSH:
2497 optval = tp->t_flags & TF_NOPUSH;
2498 INP_WUNLOCK(inp);
2499 error = sooptcopyout(sopt, &optval, sizeof optval);
2500 break;
2501 case TCP_INFO:
2502 tcp_fill_info(tp, &ti);
2503 INP_WUNLOCK(inp);
2504 error = sooptcopyout(sopt, &ti, sizeof ti);
2505 break;
2506 case TCP_STATS:
2507 {
2508 #ifdef STATS
2509 int nheld;
2510 TYPEOF_MEMBER(struct statsblob, flags) sbflags = 0;
2511
2512 error = 0;
2513 socklen_t outsbsz = sopt->sopt_valsize;
2514 if (tp->t_stats == NULL)
2515 error = ENOENT;
2516 else if (outsbsz >= tp->t_stats->cursz)
2517 outsbsz = tp->t_stats->cursz;
2518 else if (outsbsz >= sizeof(struct statsblob))
2519 outsbsz = sizeof(struct statsblob);
2520 else
2521 error = EINVAL;
2522 INP_WUNLOCK(inp);
2523 if (error)
2524 break;
2525
2526 sbp = sopt->sopt_val;
2527 nheld = atop(round_page(((vm_offset_t)sbp) +
2528 (vm_size_t)outsbsz) - trunc_page((vm_offset_t)sbp));
2529 vm_page_t ma[nheld];
2530 if (vm_fault_quick_hold_pages(
2531 &curproc->p_vmspace->vm_map, (vm_offset_t)sbp,
2532 outsbsz, VM_PROT_READ | VM_PROT_WRITE, ma,
2533 nheld) < 0) {
2534 error = EFAULT;
2535 break;
2536 }
2537
2538 if ((error = copyin_nofault(&(sbp->flags), &sbflags,
2539 SIZEOF_MEMBER(struct statsblob, flags))))
2540 goto unhold;
2541
2542 INP_WLOCK_RECHECK(inp);
2543 error = stats_blob_snapshot(&sbp, outsbsz, tp->t_stats,
2544 sbflags | SB_CLONE_USRDSTNOFAULT);
2545 INP_WUNLOCK(inp);
2546 sopt->sopt_valsize = outsbsz;
2547 unhold:
2548 vm_page_unhold_pages(ma, nheld);
2549 #else
2550 INP_WUNLOCK(inp);
2551 error = EOPNOTSUPP;
2552 #endif /* !STATS */
2553 break;
2554 }
2555 case TCP_CONGESTION:
2556 len = strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX);
2557 INP_WUNLOCK(inp);
2558 error = sooptcopyout(sopt, buf, len + 1);
2559 break;
2560 case TCP_MAXUNACKTIME:
2561 case TCP_KEEPIDLE:
2562 case TCP_KEEPINTVL:
2563 case TCP_KEEPINIT:
2564 case TCP_KEEPCNT:
2565 switch (sopt->sopt_name) {
2566 case TCP_MAXUNACKTIME:
2567 ui = TP_MAXUNACKTIME(tp) / hz;
2568 break;
2569 case TCP_KEEPIDLE:
2570 ui = TP_KEEPIDLE(tp) / hz;
2571 break;
2572 case TCP_KEEPINTVL:
2573 ui = TP_KEEPINTVL(tp) / hz;
2574 break;
2575 case TCP_KEEPINIT:
2576 ui = TP_KEEPINIT(tp) / hz;
2577 break;
2578 case TCP_KEEPCNT:
2579 ui = TP_KEEPCNT(tp);
2580 break;
2581 }
2582 INP_WUNLOCK(inp);
2583 error = sooptcopyout(sopt, &ui, sizeof(ui));
2584 break;
2585 #ifdef TCPPCAP
2586 case TCP_PCAP_OUT:
2587 case TCP_PCAP_IN:
2588 optval = tcp_pcap_get_sock_max(
2589 (sopt->sopt_name == TCP_PCAP_OUT) ?
2590 &(tp->t_outpkts) : &(tp->t_inpkts));
2591 INP_WUNLOCK(inp);
2592 error = sooptcopyout(sopt, &optval, sizeof optval);
2593 break;
2594 #endif
2595 case TCP_FASTOPEN:
2596 optval = tp->t_flags & TF_FASTOPEN;
2597 INP_WUNLOCK(inp);
2598 error = sooptcopyout(sopt, &optval, sizeof optval);
2599 break;
2600 #ifdef TCP_BLACKBOX
2601 case TCP_LOG:
2602 optval = tcp_get_bblog_state(tp);
2603 INP_WUNLOCK(inp);
2604 error = sooptcopyout(sopt, &optval, sizeof(optval));
2605 break;
2606 case TCP_LOGBUF:
2607 /* tcp_log_getlogbuf() does INP_WUNLOCK(inp) */
2608 error = tcp_log_getlogbuf(sopt, tp);
2609 break;
2610 case TCP_LOGID:
2611 len = tcp_log_get_id(tp, buf);
2612 INP_WUNLOCK(inp);
2613 error = sooptcopyout(sopt, buf, len + 1);
2614 break;
2615 case TCP_LOGDUMP:
2616 case TCP_LOGDUMPID:
2617 INP_WUNLOCK(inp);
2618 error = EINVAL;
2619 break;
2620 #endif
2621 #ifdef KERN_TLS
2622 case TCP_TXTLS_MODE:
2623 error = ktls_get_tx_mode(so, &optval);
2624 INP_WUNLOCK(inp);
2625 if (error == 0)
2626 error = sooptcopyout(sopt, &optval,
2627 sizeof(optval));
2628 break;
2629 case TCP_RXTLS_MODE:
2630 error = ktls_get_rx_mode(so, &optval);
2631 INP_WUNLOCK(inp);
2632 if (error == 0)
2633 error = sooptcopyout(sopt, &optval,
2634 sizeof(optval));
2635 break;
2636 #endif
2637 default:
2638 INP_WUNLOCK(inp);
2639 error = ENOPROTOOPT;
2640 break;
2641 }
2642 break;
2643 }
2644 return (error);
2645 }
2646 #undef INP_WLOCK_RECHECK
2647 #undef INP_WLOCK_RECHECK_CLEANUP
2648
2649 /*
2650 * Initiate (or continue) disconnect.
2651 * If embryonic state, just send reset (once).
2652 * If in ``let data drain'' option and linger null, just drop.
2653 * Otherwise (hard), mark socket disconnecting and drop
2654 * current input data; switch states based on user close, and
2655 * send segment to peer (with FIN).
2656 */
2657 static void
tcp_disconnect(struct tcpcb * tp)2658 tcp_disconnect(struct tcpcb *tp)
2659 {
2660 struct inpcb *inp = tptoinpcb(tp);
2661 struct socket *so = tptosocket(tp);
2662
2663 NET_EPOCH_ASSERT();
2664 INP_WLOCK_ASSERT(inp);
2665
2666 /*
2667 * Neither tcp_close() nor tcp_drop() should return NULL, as the
2668 * socket is still open.
2669 */
2670 if (tp->t_state < TCPS_ESTABLISHED &&
2671 !(tp->t_state > TCPS_LISTEN && (tp->t_flags & TF_FASTOPEN))) {
2672 tp = tcp_close(tp);
2673 KASSERT(tp != NULL,
2674 ("tcp_disconnect: tcp_close() returned NULL"));
2675 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
2676 tp = tcp_drop(tp, 0);
2677 KASSERT(tp != NULL,
2678 ("tcp_disconnect: tcp_drop() returned NULL"));
2679 } else {
2680 soisdisconnecting(so);
2681 sbflush(&so->so_rcv);
2682 tcp_usrclosed(tp);
2683 if (!(inp->inp_flags & INP_DROPPED))
2684 /* Ignore stack's drop request, we already at it. */
2685 (void)tcp_output_nodrop(tp);
2686 }
2687 }
2688
2689 /*
2690 * User issued close, and wish to trail through shutdown states:
2691 * if never received SYN, just forget it. If got a SYN from peer,
2692 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
2693 * If already got a FIN from peer, then almost done; go to LAST_ACK
2694 * state. In all other cases, have already sent FIN to peer (e.g.
2695 * after PRU_SHUTDOWN), and just have to play tedious game waiting
2696 * for peer to send FIN or not respond to keep-alives, etc.
2697 * We can let the user exit from the close as soon as the FIN is acked.
2698 */
2699 static void
tcp_usrclosed(struct tcpcb * tp)2700 tcp_usrclosed(struct tcpcb *tp)
2701 {
2702
2703 NET_EPOCH_ASSERT();
2704 INP_WLOCK_ASSERT(tptoinpcb(tp));
2705
2706 switch (tp->t_state) {
2707 case TCPS_LISTEN:
2708 #ifdef TCP_OFFLOAD
2709 tcp_offload_listen_stop(tp);
2710 #endif
2711 tcp_state_change(tp, TCPS_CLOSED);
2712 /* FALLTHROUGH */
2713 case TCPS_CLOSED:
2714 tp = tcp_close(tp);
2715 /*
2716 * tcp_close() should never return NULL here as the socket is
2717 * still open.
2718 */
2719 KASSERT(tp != NULL,
2720 ("tcp_usrclosed: tcp_close() returned NULL"));
2721 break;
2722
2723 case TCPS_SYN_SENT:
2724 case TCPS_SYN_RECEIVED:
2725 tp->t_flags |= TF_NEEDFIN;
2726 break;
2727
2728 case TCPS_ESTABLISHED:
2729 tcp_state_change(tp, TCPS_FIN_WAIT_1);
2730 break;
2731
2732 case TCPS_CLOSE_WAIT:
2733 tcp_state_change(tp, TCPS_LAST_ACK);
2734 break;
2735 }
2736 if (tp->t_acktime == 0)
2737 tp->t_acktime = ticks;
2738 if (tp->t_state >= TCPS_FIN_WAIT_2) {
2739 tcp_free_sackholes(tp);
2740 soisdisconnected(tptosocket(tp));
2741 /* Prevent the connection hanging in FIN_WAIT_2 forever. */
2742 if (tp->t_state == TCPS_FIN_WAIT_2) {
2743 int timeout;
2744
2745 timeout = (tcp_fast_finwait2_recycle) ?
2746 tcp_finwait2_timeout : TP_MAXIDLE(tp);
2747 tcp_timer_activate(tp, TT_2MSL, timeout);
2748 }
2749 }
2750 }
2751
2752 #ifdef DDB
2753 static void
db_print_indent(int indent)2754 db_print_indent(int indent)
2755 {
2756 int i;
2757
2758 for (i = 0; i < indent; i++)
2759 db_printf(" ");
2760 }
2761
2762 static void
db_print_tstate(int t_state)2763 db_print_tstate(int t_state)
2764 {
2765
2766 switch (t_state) {
2767 case TCPS_CLOSED:
2768 db_printf("TCPS_CLOSED");
2769 return;
2770
2771 case TCPS_LISTEN:
2772 db_printf("TCPS_LISTEN");
2773 return;
2774
2775 case TCPS_SYN_SENT:
2776 db_printf("TCPS_SYN_SENT");
2777 return;
2778
2779 case TCPS_SYN_RECEIVED:
2780 db_printf("TCPS_SYN_RECEIVED");
2781 return;
2782
2783 case TCPS_ESTABLISHED:
2784 db_printf("TCPS_ESTABLISHED");
2785 return;
2786
2787 case TCPS_CLOSE_WAIT:
2788 db_printf("TCPS_CLOSE_WAIT");
2789 return;
2790
2791 case TCPS_FIN_WAIT_1:
2792 db_printf("TCPS_FIN_WAIT_1");
2793 return;
2794
2795 case TCPS_CLOSING:
2796 db_printf("TCPS_CLOSING");
2797 return;
2798
2799 case TCPS_LAST_ACK:
2800 db_printf("TCPS_LAST_ACK");
2801 return;
2802
2803 case TCPS_FIN_WAIT_2:
2804 db_printf("TCPS_FIN_WAIT_2");
2805 return;
2806
2807 case TCPS_TIME_WAIT:
2808 db_printf("TCPS_TIME_WAIT");
2809 return;
2810
2811 default:
2812 db_printf("unknown");
2813 return;
2814 }
2815 }
2816
2817 static void
db_print_tflags(u_int t_flags)2818 db_print_tflags(u_int t_flags)
2819 {
2820 int comma;
2821
2822 comma = 0;
2823 if (t_flags & TF_ACKNOW) {
2824 db_printf("%sTF_ACKNOW", comma ? ", " : "");
2825 comma = 1;
2826 }
2827 if (t_flags & TF_DELACK) {
2828 db_printf("%sTF_DELACK", comma ? ", " : "");
2829 comma = 1;
2830 }
2831 if (t_flags & TF_NODELAY) {
2832 db_printf("%sTF_NODELAY", comma ? ", " : "");
2833 comma = 1;
2834 }
2835 if (t_flags & TF_NOOPT) {
2836 db_printf("%sTF_NOOPT", comma ? ", " : "");
2837 comma = 1;
2838 }
2839 if (t_flags & TF_SENTFIN) {
2840 db_printf("%sTF_SENTFIN", comma ? ", " : "");
2841 comma = 1;
2842 }
2843 if (t_flags & TF_REQ_SCALE) {
2844 db_printf("%sTF_REQ_SCALE", comma ? ", " : "");
2845 comma = 1;
2846 }
2847 if (t_flags & TF_RCVD_SCALE) {
2848 db_printf("%sTF_RECVD_SCALE", comma ? ", " : "");
2849 comma = 1;
2850 }
2851 if (t_flags & TF_REQ_TSTMP) {
2852 db_printf("%sTF_REQ_TSTMP", comma ? ", " : "");
2853 comma = 1;
2854 }
2855 if (t_flags & TF_RCVD_TSTMP) {
2856 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : "");
2857 comma = 1;
2858 }
2859 if (t_flags & TF_SACK_PERMIT) {
2860 db_printf("%sTF_SACK_PERMIT", comma ? ", " : "");
2861 comma = 1;
2862 }
2863 if (t_flags & TF_NEEDSYN) {
2864 db_printf("%sTF_NEEDSYN", comma ? ", " : "");
2865 comma = 1;
2866 }
2867 if (t_flags & TF_NEEDFIN) {
2868 db_printf("%sTF_NEEDFIN", comma ? ", " : "");
2869 comma = 1;
2870 }
2871 if (t_flags & TF_NOPUSH) {
2872 db_printf("%sTF_NOPUSH", comma ? ", " : "");
2873 comma = 1;
2874 }
2875 if (t_flags & TF_PREVVALID) {
2876 db_printf("%sTF_PREVVALID", comma ? ", " : "");
2877 comma = 1;
2878 }
2879 if (t_flags & TF_WAKESOR) {
2880 db_printf("%sTF_WAKESOR", comma ? ", " : "");
2881 comma = 1;
2882 }
2883 if (t_flags & TF_GPUTINPROG) {
2884 db_printf("%sTF_GPUTINPROG", comma ? ", " : "");
2885 comma = 1;
2886 }
2887 if (t_flags & TF_MORETOCOME) {
2888 db_printf("%sTF_MORETOCOME", comma ? ", " : "");
2889 comma = 1;
2890 }
2891 if (t_flags & TF_SONOTCONN) {
2892 db_printf("%sTF_SONOTCONN", comma ? ", " : "");
2893 comma = 1;
2894 }
2895 if (t_flags & TF_LASTIDLE) {
2896 db_printf("%sTF_LASTIDLE", comma ? ", " : "");
2897 comma = 1;
2898 }
2899 if (t_flags & TF_RXWIN0SENT) {
2900 db_printf("%sTF_RXWIN0SENT", comma ? ", " : "");
2901 comma = 1;
2902 }
2903 if (t_flags & TF_FASTRECOVERY) {
2904 db_printf("%sTF_FASTRECOVERY", comma ? ", " : "");
2905 comma = 1;
2906 }
2907 if (t_flags & TF_WASFRECOVERY) {
2908 db_printf("%sTF_WASFRECOVERY", comma ? ", " : "");
2909 comma = 1;
2910 }
2911 if (t_flags & TF_SIGNATURE) {
2912 db_printf("%sTF_SIGNATURE", comma ? ", " : "");
2913 comma = 1;
2914 }
2915 if (t_flags & TF_FORCEDATA) {
2916 db_printf("%sTF_FORCEDATA", comma ? ", " : "");
2917 comma = 1;
2918 }
2919 if (t_flags & TF_TSO) {
2920 db_printf("%sTF_TSO", comma ? ", " : "");
2921 comma = 1;
2922 }
2923 if (t_flags & TF_TOE) {
2924 db_printf("%sTF_TOE", comma ? ", " : "");
2925 comma = 1;
2926 }
2927 if (t_flags & TF_CLOSED) {
2928 db_printf("%sTF_CLOSED", comma ? ", " : "");
2929 comma = 1;
2930 }
2931 if (t_flags & TF_SENTSYN) {
2932 db_printf("%sTF_SENTSYN", comma ? ", " : "");
2933 comma = 1;
2934 }
2935 if (t_flags & TF_LRD) {
2936 db_printf("%sTF_LRD", comma ? ", " : "");
2937 comma = 1;
2938 }
2939 if (t_flags & TF_CONGRECOVERY) {
2940 db_printf("%sTF_CONGRECOVERY", comma ? ", " : "");
2941 comma = 1;
2942 }
2943 if (t_flags & TF_WASCRECOVERY) {
2944 db_printf("%sTF_WASCRECOVERY", comma ? ", " : "");
2945 comma = 1;
2946 }
2947 if (t_flags & TF_FASTOPEN) {
2948 db_printf("%sTF_FASTOPEN", comma ? ", " : "");
2949 comma = 1;
2950 }
2951 }
2952
2953 static void
db_print_tflags2(u_int t_flags2)2954 db_print_tflags2(u_int t_flags2)
2955 {
2956 int comma;
2957
2958 comma = 0;
2959 if (t_flags2 & TF2_PLPMTU_BLACKHOLE) {
2960 db_printf("%sTF2_PLPMTU_BLACKHOLE", comma ? ", " : "");
2961 comma = 1;
2962 }
2963 if (t_flags2 & TF2_PLPMTU_PMTUD) {
2964 db_printf("%sTF2_PLPMTU_PMTUD", comma ? ", " : "");
2965 comma = 1;
2966 }
2967 if (t_flags2 & TF2_PLPMTU_MAXSEGSNT) {
2968 db_printf("%sTF2_PLPMTU_MAXSEGSNT", comma ? ", " : "");
2969 comma = 1;
2970 }
2971 if (t_flags2 & TF2_LOG_AUTO) {
2972 db_printf("%sTF2_LOG_AUTO", comma ? ", " : "");
2973 comma = 1;
2974 }
2975 if (t_flags2 & TF2_DROP_AF_DATA) {
2976 db_printf("%sTF2_DROP_AF_DATA", comma ? ", " : "");
2977 comma = 1;
2978 }
2979 if (t_flags2 & TF2_ECN_PERMIT) {
2980 db_printf("%sTF2_ECN_PERMIT", comma ? ", " : "");
2981 comma = 1;
2982 }
2983 if (t_flags2 & TF2_ECN_SND_CWR) {
2984 db_printf("%sTF2_ECN_SND_CWR", comma ? ", " : "");
2985 comma = 1;
2986 }
2987 if (t_flags2 & TF2_ECN_SND_ECE) {
2988 db_printf("%sTF2_ECN_SND_ECE", comma ? ", " : "");
2989 comma = 1;
2990 }
2991 if (t_flags2 & TF2_ACE_PERMIT) {
2992 db_printf("%sTF2_ACE_PERMIT", comma ? ", " : "");
2993 comma = 1;
2994 }
2995 if (t_flags2 & TF2_HPTS_CPU_SET) {
2996 db_printf("%sTF2_HPTS_CPU_SET", comma ? ", " : "");
2997 comma = 1;
2998 }
2999 if (t_flags2 & TF2_FBYTES_COMPLETE) {
3000 db_printf("%sTF2_FBYTES_COMPLETE", comma ? ", " : "");
3001 comma = 1;
3002 }
3003 if (t_flags2 & TF2_ECN_USE_ECT1) {
3004 db_printf("%sTF2_ECN_USE_ECT1", comma ? ", " : "");
3005 comma = 1;
3006 }
3007 if (t_flags2 & TF2_TCP_ACCOUNTING) {
3008 db_printf("%sTF2_TCP_ACCOUNTING", comma ? ", " : "");
3009 comma = 1;
3010 }
3011 if (t_flags2 & TF2_HPTS_CALLS) {
3012 db_printf("%sTF2_HPTS_CALLS", comma ? ", " : "");
3013 comma = 1;
3014 }
3015 if (t_flags2 & TF2_MBUF_L_ACKS) {
3016 db_printf("%sTF2_MBUF_L_ACKS", comma ? ", " : "");
3017 comma = 1;
3018 }
3019 if (t_flags2 & TF2_MBUF_ACKCMP) {
3020 db_printf("%sTF2_MBUF_ACKCMP", comma ? ", " : "");
3021 comma = 1;
3022 }
3023 if (t_flags2 & TF2_SUPPORTS_MBUFQ) {
3024 db_printf("%sTF2_SUPPORTS_MBUFQ", comma ? ", " : "");
3025 comma = 1;
3026 }
3027 if (t_flags2 & TF2_MBUF_QUEUE_READY) {
3028 db_printf("%sTF2_MBUF_QUEUE_READY", comma ? ", " : "");
3029 comma = 1;
3030 }
3031 if (t_flags2 & TF2_DONT_SACK_QUEUE) {
3032 db_printf("%sTF2_DONT_SACK_QUEUE", comma ? ", " : "");
3033 comma = 1;
3034 }
3035 if (t_flags2 & TF2_CANNOT_DO_ECN) {
3036 db_printf("%sTF2_CANNOT_DO_ECN", comma ? ", " : "");
3037 comma = 1;
3038 }
3039 if (t_flags2 & TF2_PROC_SACK_PROHIBIT) {
3040 db_printf("%sTF2_PROC_SACK_PROHIBIT", comma ? ", " : "");
3041 comma = 1;
3042 }
3043 if (t_flags2 & TF2_IPSEC_TSO) {
3044 db_printf("%sTF2_IPSEC_TSO", comma ? ", " : "");
3045 comma = 1;
3046 }
3047 if (t_flags2 & TF2_NO_ISS_CHECK) {
3048 db_printf("%sTF2_NO_ISS_CHECK", comma ? ", " : "");
3049 comma = 1;
3050 }
3051 }
3052
3053 static void
db_print_toobflags(char t_oobflags)3054 db_print_toobflags(char t_oobflags)
3055 {
3056 int comma;
3057
3058 comma = 0;
3059 if (t_oobflags & TCPOOB_HAVEDATA) {
3060 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : "");
3061 comma = 1;
3062 }
3063 if (t_oobflags & TCPOOB_HADDATA) {
3064 db_printf("%sTCPOOB_HADDATA", comma ? ", " : "");
3065 comma = 1;
3066 }
3067 }
3068
3069 static void
db_print_tcpcb(struct tcpcb * tp,const char * name,int indent)3070 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent)
3071 {
3072
3073 db_print_indent(indent);
3074 db_printf("%s at %p\n", name, tp);
3075
3076 indent += 2;
3077
3078 db_print_indent(indent);
3079 db_printf("t_segq first: %p t_segqlen: %d t_dupacks: %d\n",
3080 TAILQ_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks);
3081
3082 db_print_indent(indent);
3083 db_printf("t_callout: %p t_timers: %p\n",
3084 &tp->t_callout, &tp->t_timers);
3085
3086 db_print_indent(indent);
3087 db_printf("t_state: %d (", tp->t_state);
3088 db_print_tstate(tp->t_state);
3089 db_printf(")\n");
3090
3091 db_print_indent(indent);
3092 db_printf("t_flags: 0x%x (", tp->t_flags);
3093 db_print_tflags(tp->t_flags);
3094 db_printf(")\n");
3095
3096 db_print_indent(indent);
3097 db_printf("t_flags2: 0x%x (", tp->t_flags2);
3098 db_print_tflags2(tp->t_flags2);
3099 db_printf(")\n");
3100
3101 db_print_indent(indent);
3102 db_printf("snd_una: 0x%08x snd_max: 0x%08x snd_nxt: 0x%08x\n",
3103 tp->snd_una, tp->snd_max, tp->snd_nxt);
3104
3105 db_print_indent(indent);
3106 db_printf("snd_up: 0x%08x snd_wl1: 0x%08x snd_wl2: 0x%08x\n",
3107 tp->snd_up, tp->snd_wl1, tp->snd_wl2);
3108
3109 db_print_indent(indent);
3110 db_printf("iss: 0x%08x irs: 0x%08x rcv_nxt: 0x%08x\n",
3111 tp->iss, tp->irs, tp->rcv_nxt);
3112
3113 db_print_indent(indent);
3114 db_printf("rcv_adv: 0x%08x rcv_wnd: %u rcv_up: 0x%08x\n",
3115 tp->rcv_adv, tp->rcv_wnd, tp->rcv_up);
3116
3117 db_print_indent(indent);
3118 db_printf("snd_wnd: %u snd_cwnd: %u\n",
3119 tp->snd_wnd, tp->snd_cwnd);
3120
3121 db_print_indent(indent);
3122 db_printf("snd_ssthresh: %u snd_recover: "
3123 "0x%08x\n", tp->snd_ssthresh, tp->snd_recover);
3124
3125 db_print_indent(indent);
3126 db_printf("t_rcvtime: %u t_startime: %u\n",
3127 tp->t_rcvtime, tp->t_starttime);
3128
3129 db_print_indent(indent);
3130 db_printf("t_rttime: %u t_rtsq: 0x%08x\n",
3131 tp->t_rtttime, tp->t_rtseq);
3132
3133 db_print_indent(indent);
3134 db_printf("t_rxtcur: %d t_maxseg: %u t_srtt: %d\n",
3135 tp->t_rxtcur, tp->t_maxseg, tp->t_srtt);
3136
3137 db_print_indent(indent);
3138 db_printf("t_rttvar: %d t_rxtshift: %d t_rttmin: %u\n",
3139 tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin);
3140
3141 db_print_indent(indent);
3142 db_printf("t_rttupdated: %u max_sndwnd: %u t_softerror: %d\n",
3143 tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror);
3144
3145 db_print_indent(indent);
3146 db_printf("t_oobflags: 0x%x (", tp->t_oobflags);
3147 db_print_toobflags(tp->t_oobflags);
3148 db_printf(") t_iobc: 0x%02x\n", tp->t_iobc);
3149
3150 db_print_indent(indent);
3151 db_printf("snd_scale: %u rcv_scale: %u request_r_scale: %u\n",
3152 tp->snd_scale, tp->rcv_scale, tp->request_r_scale);
3153
3154 db_print_indent(indent);
3155 db_printf("ts_recent: %u ts_recent_age: %u\n",
3156 tp->ts_recent, tp->ts_recent_age);
3157
3158 db_print_indent(indent);
3159 db_printf("ts_offset: %u last_ack_sent: 0x%08x snd_cwnd_prev: "
3160 "%u\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev);
3161
3162 db_print_indent(indent);
3163 db_printf("snd_ssthresh_prev: %u snd_recover_prev: 0x%08x "
3164 "t_badrxtwin: %u\n", tp->snd_ssthresh_prev,
3165 tp->snd_recover_prev, tp->t_badrxtwin);
3166
3167 db_print_indent(indent);
3168 db_printf("snd_numholes: %d snd_holes first: %p\n",
3169 tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes));
3170
3171 db_print_indent(indent);
3172 db_printf("snd_fack: 0x%08x rcv_numsacks: %d\n",
3173 tp->snd_fack, tp->rcv_numsacks);
3174
3175 /* Skip sackblks, sackhint. */
3176
3177 db_print_indent(indent);
3178 db_printf("t_rttlow: %d rfbuf_ts: %u rfbuf_cnt: %d\n",
3179 tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt);
3180 }
3181
DB_SHOW_COMMAND(tcpcb,db_show_tcpcb)3182 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb)
3183 {
3184 struct tcpcb *tp;
3185
3186 if (!have_addr) {
3187 db_printf("usage: show tcpcb <addr>\n");
3188 return;
3189 }
3190 tp = (struct tcpcb *)addr;
3191
3192 db_print_tcpcb(tp, "tcpcb", 0);
3193 }
3194 #endif
3195