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 * From: @(#)tcp_usrreq.c 8.2 (Berkeley) 1/3/94
38 */
39
40 #include <sys/cdefs.h>
41 __FBSDID("$FreeBSD$");
42
43 #include "opt_ddb.h"
44 #include "opt_inet.h"
45 #include "opt_inet6.h"
46 #include "opt_ipsec.h"
47 #include "opt_tcpdebug.h"
48
49 #include <sys/param.h>
50 #include <sys/systm.h>
51 #include <sys/limits.h>
52 #include <sys/malloc.h>
53 #include <sys/refcount.h>
54 #include <sys/kernel.h>
55 #include <sys/sysctl.h>
56 #include <sys/mbuf.h>
57 #ifdef INET6
58 #include <sys/domain.h>
59 #endif /* INET6 */
60 #include <sys/socket.h>
61 #include <sys/socketvar.h>
62 #include <sys/protosw.h>
63 #include <sys/proc.h>
64 #include <sys/jail.h>
65 #include <sys/syslog.h>
66
67 #ifdef DDB
68 #include <ddb/ddb.h>
69 #endif
70
71 #include <net/if.h>
72 #include <net/if_var.h>
73 #include <net/route.h>
74 #include <net/vnet.h>
75
76 #include <netinet/in.h>
77 #include <netinet/in_kdtrace.h>
78 #include <netinet/in_pcb.h>
79 #include <netinet/in_systm.h>
80 #include <netinet/in_var.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 TCPDEBUG
102 #include <netinet/tcp_debug.h>
103 #endif
104 #ifdef TCP_OFFLOAD
105 #include <netinet/tcp_offload.h>
106 #endif
107 #include <netipsec/ipsec_support.h>
108
109 /*
110 * TCP protocol interface to socket abstraction.
111 */
112 static int tcp_attach(struct socket *);
113 #ifdef INET
114 static int tcp_connect(struct tcpcb *, struct sockaddr *,
115 struct thread *td);
116 #endif /* INET */
117 #ifdef INET6
118 static int tcp6_connect(struct tcpcb *, struct sockaddr *,
119 struct thread *td);
120 #endif /* INET6 */
121 static void tcp_disconnect(struct tcpcb *);
122 static void tcp_usrclosed(struct tcpcb *);
123 static void tcp_fill_info(struct tcpcb *, struct tcp_info *);
124
125 #ifdef TCPDEBUG
126 #define TCPDEBUG0 int ostate = 0
127 #define TCPDEBUG1() ostate = tp ? tp->t_state : 0
128 #define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \
129 tcp_trace(TA_USER, ostate, tp, 0, 0, req)
130 #else
131 #define TCPDEBUG0
132 #define TCPDEBUG1()
133 #define TCPDEBUG2(req)
134 #endif
135
136 /*
137 * TCP attaches to socket via pru_attach(), reserving space,
138 * and an internet control block.
139 */
140 static int
tcp_usr_attach(struct socket * so,int proto,struct thread * td)141 tcp_usr_attach(struct socket *so, int proto, struct thread *td)
142 {
143 struct inpcb *inp;
144 struct tcpcb *tp = NULL;
145 int error;
146 TCPDEBUG0;
147
148 inp = sotoinpcb(so);
149 KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL"));
150 TCPDEBUG1();
151
152 error = tcp_attach(so);
153 if (error)
154 goto out;
155
156 if ((so->so_options & SO_LINGER) && so->so_linger == 0)
157 so->so_linger = TCP_LINGERTIME;
158
159 inp = sotoinpcb(so);
160 tp = intotcpcb(inp);
161 out:
162 TCPDEBUG2(PRU_ATTACH);
163 TCP_PROBE2(debug__user, tp, PRU_ATTACH);
164 return error;
165 }
166
167 /*
168 * tcp_detach is called when the socket layer loses its final reference
169 * to the socket, be it a file descriptor reference, a reference from TCP,
170 * etc. At this point, there is only one case in which we will keep around
171 * inpcb state: time wait.
172 *
173 * This function can probably be re-absorbed back into tcp_usr_detach() now
174 * that there is a single detach path.
175 */
176 static void
tcp_detach(struct socket * so,struct inpcb * inp)177 tcp_detach(struct socket *so, struct inpcb *inp)
178 {
179 struct tcpcb *tp;
180
181 INP_INFO_LOCK_ASSERT(&V_tcbinfo);
182 INP_WLOCK_ASSERT(inp);
183
184 KASSERT(so->so_pcb == inp, ("tcp_detach: so_pcb != inp"));
185 KASSERT(inp->inp_socket == so, ("tcp_detach: inp_socket != so"));
186
187 tp = intotcpcb(inp);
188
189 if (inp->inp_flags & INP_TIMEWAIT) {
190 /*
191 * There are two cases to handle: one in which the time wait
192 * state is being discarded (INP_DROPPED), and one in which
193 * this connection will remain in timewait. In the former,
194 * it is time to discard all state (except tcptw, which has
195 * already been discarded by the timewait close code, which
196 * should be further up the call stack somewhere). In the
197 * latter case, we detach from the socket, but leave the pcb
198 * present until timewait ends.
199 *
200 * XXXRW: Would it be cleaner to free the tcptw here?
201 *
202 * Astute question indeed, from twtcp perspective there are
203 * four cases to consider:
204 *
205 * #1 tcp_detach is called at tcptw creation time by
206 * tcp_twstart, then do not discard the newly created tcptw
207 * and leave inpcb present until timewait ends
208 * #2 tcp_detach is called at tcptw creation time by
209 * tcp_twstart, but connection is local and tw will be
210 * discarded immediately
211 * #3 tcp_detach is called at timewait end (or reuse) by
212 * tcp_twclose, then the tcptw has already been discarded
213 * (or reused) and inpcb is freed here
214 * #4 tcp_detach is called() after timewait ends (or reuse)
215 * (e.g. by soclose), then tcptw has already been discarded
216 * (or reused) and inpcb is freed here
217 *
218 * In all three cases the tcptw should not be freed here.
219 */
220 if (inp->inp_flags & INP_DROPPED) {
221 in_pcbdetach(inp);
222 if (__predict_true(tp == NULL)) {
223 in_pcbfree(inp);
224 } else {
225 /*
226 * This case should not happen as in TIMEWAIT
227 * state the inp should not be destroyed before
228 * its tcptw. If INVARIANTS is defined, panic.
229 */
230 #ifdef INVARIANTS
231 panic("%s: Panic before an inp double-free: "
232 "INP_TIMEWAIT && INP_DROPPED && tp != NULL"
233 , __func__);
234 #else
235 log(LOG_ERR, "%s: Avoid an inp double-free: "
236 "INP_TIMEWAIT && INP_DROPPED && tp != NULL"
237 , __func__);
238 #endif
239 INP_WUNLOCK(inp);
240 }
241 } else {
242 in_pcbdetach(inp);
243 INP_WUNLOCK(inp);
244 }
245 } else {
246 /*
247 * If the connection is not in timewait, we consider two
248 * two conditions: one in which no further processing is
249 * necessary (dropped || embryonic), and one in which TCP is
250 * not yet done, but no longer requires the socket, so the
251 * pcb will persist for the time being.
252 *
253 * XXXRW: Does the second case still occur?
254 */
255 if (inp->inp_flags & INP_DROPPED ||
256 tp->t_state < TCPS_SYN_SENT) {
257 tcp_discardcb(tp);
258 in_pcbdetach(inp);
259 in_pcbfree(inp);
260 } else {
261 in_pcbdetach(inp);
262 INP_WUNLOCK(inp);
263 }
264 }
265 }
266
267 /*
268 * pru_detach() detaches the TCP protocol from the socket.
269 * If the protocol state is non-embryonic, then can't
270 * do this directly: have to initiate a pru_disconnect(),
271 * which may finish later; embryonic TCB's can just
272 * be discarded here.
273 */
274 static void
tcp_usr_detach(struct socket * so)275 tcp_usr_detach(struct socket *so)
276 {
277 struct inpcb *inp;
278 int rlock = 0;
279 struct epoch_tracker et;
280
281 inp = sotoinpcb(so);
282 KASSERT(inp != NULL, ("tcp_usr_detach: inp == NULL"));
283 if (!INP_INFO_WLOCKED(&V_tcbinfo)) {
284 INP_INFO_RLOCK_ET(&V_tcbinfo, et);
285 rlock = 1;
286 }
287 INP_WLOCK(inp);
288 KASSERT(inp->inp_socket != NULL,
289 ("tcp_usr_detach: inp_socket == NULL"));
290 tcp_detach(so, inp);
291 if (rlock)
292 INP_INFO_RUNLOCK_ET(&V_tcbinfo, et);
293 }
294
295 #ifdef INET
296 /*
297 * Give the socket an address.
298 */
299 static int
tcp_usr_bind(struct socket * so,struct sockaddr * nam,struct thread * td)300 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
301 {
302 int error = 0;
303 struct inpcb *inp;
304 struct tcpcb *tp = NULL;
305 struct sockaddr_in *sinp;
306
307 sinp = (struct sockaddr_in *)nam;
308 if (nam->sa_len != sizeof (*sinp))
309 return (EINVAL);
310 /*
311 * Must check for multicast addresses and disallow binding
312 * to them.
313 */
314 if (sinp->sin_family == AF_INET &&
315 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
316 return (EAFNOSUPPORT);
317
318 TCPDEBUG0;
319 inp = sotoinpcb(so);
320 KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL"));
321 INP_WLOCK(inp);
322 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
323 error = EINVAL;
324 goto out;
325 }
326 tp = intotcpcb(inp);
327 TCPDEBUG1();
328 INP_HASH_WLOCK(&V_tcbinfo);
329 error = in_pcbbind(inp, nam, td->td_ucred);
330 INP_HASH_WUNLOCK(&V_tcbinfo);
331 out:
332 TCPDEBUG2(PRU_BIND);
333 TCP_PROBE2(debug__user, tp, PRU_BIND);
334 INP_WUNLOCK(inp);
335
336 return (error);
337 }
338 #endif /* INET */
339
340 #ifdef INET6
341 static int
tcp6_usr_bind(struct socket * so,struct sockaddr * nam,struct thread * td)342 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
343 {
344 int error = 0;
345 struct inpcb *inp;
346 struct tcpcb *tp = NULL;
347 struct sockaddr_in6 *sin6p;
348 u_char vflagsav;
349
350 sin6p = (struct sockaddr_in6 *)nam;
351 if (nam->sa_len != sizeof (*sin6p))
352 return (EINVAL);
353 /*
354 * Must check for multicast addresses and disallow binding
355 * to them.
356 */
357 if (sin6p->sin6_family == AF_INET6 &&
358 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr))
359 return (EAFNOSUPPORT);
360
361 TCPDEBUG0;
362 inp = sotoinpcb(so);
363 KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL"));
364 INP_WLOCK(inp);
365 vflagsav = inp->inp_vflag;
366 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
367 error = EINVAL;
368 goto out;
369 }
370 tp = intotcpcb(inp);
371 TCPDEBUG1();
372 INP_HASH_WLOCK(&V_tcbinfo);
373 inp->inp_vflag &= ~INP_IPV4;
374 inp->inp_vflag |= INP_IPV6;
375 #ifdef INET
376 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
377 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr))
378 inp->inp_vflag |= INP_IPV4;
379 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
380 struct sockaddr_in sin;
381
382 in6_sin6_2_sin(&sin, sin6p);
383 if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
384 error = EAFNOSUPPORT;
385 INP_HASH_WUNLOCK(&V_tcbinfo);
386 goto out;
387 }
388 inp->inp_vflag |= INP_IPV4;
389 inp->inp_vflag &= ~INP_IPV6;
390 error = in_pcbbind(inp, (struct sockaddr *)&sin,
391 td->td_ucred);
392 INP_HASH_WUNLOCK(&V_tcbinfo);
393 goto out;
394 }
395 }
396 #endif
397 error = in6_pcbbind(inp, nam, td->td_ucred);
398 INP_HASH_WUNLOCK(&V_tcbinfo);
399 out:
400 if (error != 0)
401 inp->inp_vflag = vflagsav;
402 TCPDEBUG2(PRU_BIND);
403 TCP_PROBE2(debug__user, tp, PRU_BIND);
404 INP_WUNLOCK(inp);
405 return (error);
406 }
407 #endif /* INET6 */
408
409 #ifdef INET
410 /*
411 * Prepare to accept connections.
412 */
413 static int
tcp_usr_listen(struct socket * so,int backlog,struct thread * td)414 tcp_usr_listen(struct socket *so, int backlog, struct thread *td)
415 {
416 int error = 0;
417 struct inpcb *inp;
418 struct tcpcb *tp = NULL;
419
420 TCPDEBUG0;
421 inp = sotoinpcb(so);
422 KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL"));
423 INP_WLOCK(inp);
424 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
425 error = EINVAL;
426 goto out;
427 }
428 tp = intotcpcb(inp);
429 TCPDEBUG1();
430 SOCK_LOCK(so);
431 error = solisten_proto_check(so);
432 INP_HASH_WLOCK(&V_tcbinfo);
433 if (error == 0 && inp->inp_lport == 0)
434 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
435 INP_HASH_WUNLOCK(&V_tcbinfo);
436 if (error == 0) {
437 tcp_state_change(tp, TCPS_LISTEN);
438 solisten_proto(so, backlog);
439 #ifdef TCP_OFFLOAD
440 if ((so->so_options & SO_NO_OFFLOAD) == 0)
441 tcp_offload_listen_start(tp);
442 #endif
443 }
444 SOCK_UNLOCK(so);
445
446 if (IS_FASTOPEN(tp->t_flags))
447 tp->t_tfo_pending = tcp_fastopen_alloc_counter();
448
449 out:
450 TCPDEBUG2(PRU_LISTEN);
451 TCP_PROBE2(debug__user, tp, PRU_LISTEN);
452 INP_WUNLOCK(inp);
453 return (error);
454 }
455 #endif /* INET */
456
457 #ifdef INET6
458 static int
tcp6_usr_listen(struct socket * so,int backlog,struct thread * td)459 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td)
460 {
461 int error = 0;
462 struct inpcb *inp;
463 struct tcpcb *tp = NULL;
464 u_char vflagsav;
465
466 TCPDEBUG0;
467 inp = sotoinpcb(so);
468 KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL"));
469 INP_WLOCK(inp);
470 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
471 error = EINVAL;
472 goto out;
473 }
474 vflagsav = inp->inp_vflag;
475 tp = intotcpcb(inp);
476 TCPDEBUG1();
477 SOCK_LOCK(so);
478 error = solisten_proto_check(so);
479 INP_HASH_WLOCK(&V_tcbinfo);
480 if (error == 0 && inp->inp_lport == 0) {
481 inp->inp_vflag &= ~INP_IPV4;
482 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
483 inp->inp_vflag |= INP_IPV4;
484 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
485 }
486 INP_HASH_WUNLOCK(&V_tcbinfo);
487 if (error == 0) {
488 tcp_state_change(tp, TCPS_LISTEN);
489 solisten_proto(so, backlog);
490 #ifdef TCP_OFFLOAD
491 if ((so->so_options & SO_NO_OFFLOAD) == 0)
492 tcp_offload_listen_start(tp);
493 #endif
494 }
495 SOCK_UNLOCK(so);
496
497 if (IS_FASTOPEN(tp->t_flags))
498 tp->t_tfo_pending = tcp_fastopen_alloc_counter();
499
500 if (error != 0)
501 inp->inp_vflag = vflagsav;
502
503 out:
504 TCPDEBUG2(PRU_LISTEN);
505 TCP_PROBE2(debug__user, tp, PRU_LISTEN);
506 INP_WUNLOCK(inp);
507 return (error);
508 }
509 #endif /* INET6 */
510
511 #ifdef INET
512 /*
513 * Initiate connection to peer.
514 * Create a template for use in transmissions on this connection.
515 * Enter SYN_SENT state, and mark socket as connecting.
516 * Start keep-alive timer, and seed output sequence space.
517 * Send initial segment on connection.
518 */
519 static int
tcp_usr_connect(struct socket * so,struct sockaddr * nam,struct thread * td)520 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
521 {
522 int error = 0;
523 struct inpcb *inp;
524 struct tcpcb *tp = NULL;
525 struct sockaddr_in *sinp;
526
527 sinp = (struct sockaddr_in *)nam;
528 if (nam->sa_len != sizeof (*sinp))
529 return (EINVAL);
530 /*
531 * Must disallow TCP ``connections'' to multicast addresses.
532 */
533 if (sinp->sin_family == AF_INET
534 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
535 return (EAFNOSUPPORT);
536 if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0)
537 return (error);
538
539 TCPDEBUG0;
540 inp = sotoinpcb(so);
541 KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL"));
542 INP_WLOCK(inp);
543 if (inp->inp_flags & INP_TIMEWAIT) {
544 error = EADDRINUSE;
545 goto out;
546 }
547 if (inp->inp_flags & INP_DROPPED) {
548 error = ECONNREFUSED;
549 goto out;
550 }
551 tp = intotcpcb(inp);
552 TCPDEBUG1();
553 if ((error = tcp_connect(tp, nam, td)) != 0)
554 goto out;
555 #ifdef TCP_OFFLOAD
556 if (registered_toedevs > 0 &&
557 (so->so_options & SO_NO_OFFLOAD) == 0 &&
558 (error = tcp_offload_connect(so, nam)) == 0)
559 goto out;
560 #endif
561 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp));
562 error = tp->t_fb->tfb_tcp_output(tp);
563 out:
564 TCPDEBUG2(PRU_CONNECT);
565 TCP_PROBE2(debug__user, tp, PRU_CONNECT);
566 INP_WUNLOCK(inp);
567 return (error);
568 }
569 #endif /* INET */
570
571 #ifdef INET6
572 static int
tcp6_usr_connect(struct socket * so,struct sockaddr * nam,struct thread * td)573 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
574 {
575 int error = 0;
576 struct inpcb *inp;
577 struct tcpcb *tp = NULL;
578 struct sockaddr_in6 *sin6p;
579 u_int8_t incflagsav;
580 u_char vflagsav;
581
582 TCPDEBUG0;
583
584 sin6p = (struct sockaddr_in6 *)nam;
585 if (nam->sa_len != sizeof (*sin6p))
586 return (EINVAL);
587 /*
588 * Must disallow TCP ``connections'' to multicast addresses.
589 */
590 if (sin6p->sin6_family == AF_INET6
591 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr))
592 return (EAFNOSUPPORT);
593
594 inp = sotoinpcb(so);
595 KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL"));
596 INP_WLOCK(inp);
597 vflagsav = inp->inp_vflag;
598 incflagsav = inp->inp_inc.inc_flags;
599 if (inp->inp_flags & INP_TIMEWAIT) {
600 error = EADDRINUSE;
601 goto out;
602 }
603 if (inp->inp_flags & INP_DROPPED) {
604 error = ECONNREFUSED;
605 goto out;
606 }
607 tp = intotcpcb(inp);
608 TCPDEBUG1();
609 #ifdef INET
610 /*
611 * XXXRW: Some confusion: V4/V6 flags relate to binding, and
612 * therefore probably require the hash lock, which isn't held here.
613 * Is this a significant problem?
614 */
615 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
616 struct sockaddr_in sin;
617
618 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
619 error = EINVAL;
620 goto out;
621 }
622 if ((inp->inp_vflag & INP_IPV4) == 0) {
623 error = EAFNOSUPPORT;
624 goto out;
625 }
626
627 in6_sin6_2_sin(&sin, sin6p);
628 if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
629 error = EAFNOSUPPORT;
630 goto out;
631 }
632 if ((error = prison_remote_ip4(td->td_ucred,
633 &sin.sin_addr)) != 0)
634 goto out;
635 inp->inp_vflag |= INP_IPV4;
636 inp->inp_vflag &= ~INP_IPV6;
637 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0)
638 goto out;
639 #ifdef TCP_OFFLOAD
640 if (registered_toedevs > 0 &&
641 (so->so_options & SO_NO_OFFLOAD) == 0 &&
642 (error = tcp_offload_connect(so, nam)) == 0)
643 goto out;
644 #endif
645 error = tp->t_fb->tfb_tcp_output(tp);
646 goto out;
647 } else {
648 if ((inp->inp_vflag & INP_IPV6) == 0) {
649 error = EAFNOSUPPORT;
650 goto out;
651 }
652 }
653 #endif
654 if ((error = prison_remote_ip6(td->td_ucred, &sin6p->sin6_addr)) != 0)
655 goto out;
656 inp->inp_vflag &= ~INP_IPV4;
657 inp->inp_vflag |= INP_IPV6;
658 inp->inp_inc.inc_flags |= INC_ISIPV6;
659 if ((error = tcp6_connect(tp, nam, td)) != 0)
660 goto out;
661 #ifdef TCP_OFFLOAD
662 if (registered_toedevs > 0 &&
663 (so->so_options & SO_NO_OFFLOAD) == 0 &&
664 (error = tcp_offload_connect(so, nam)) == 0)
665 goto out;
666 #endif
667 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp));
668 error = tp->t_fb->tfb_tcp_output(tp);
669
670 out:
671 /*
672 * If the implicit bind in the connect call fails, restore
673 * the flags we modified.
674 */
675 if (error != 0 && inp->inp_lport == 0) {
676 inp->inp_vflag = vflagsav;
677 inp->inp_inc.inc_flags = incflagsav;
678 }
679
680 TCPDEBUG2(PRU_CONNECT);
681 TCP_PROBE2(debug__user, tp, PRU_CONNECT);
682 INP_WUNLOCK(inp);
683 return (error);
684 }
685 #endif /* INET6 */
686
687 /*
688 * Initiate disconnect from peer.
689 * If connection never passed embryonic stage, just drop;
690 * else if don't need to let data drain, then can just drop anyways,
691 * else have to begin TCP shutdown process: mark socket disconnecting,
692 * drain unread data, state switch to reflect user close, and
693 * send segment (e.g. FIN) to peer. Socket will be really disconnected
694 * when peer sends FIN and acks ours.
695 *
696 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
697 */
698 static int
tcp_usr_disconnect(struct socket * so)699 tcp_usr_disconnect(struct socket *so)
700 {
701 struct inpcb *inp;
702 struct tcpcb *tp = NULL;
703 struct epoch_tracker et;
704 int error = 0;
705
706 TCPDEBUG0;
707 INP_INFO_RLOCK_ET(&V_tcbinfo, et);
708 inp = sotoinpcb(so);
709 KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL"));
710 INP_WLOCK(inp);
711 if (inp->inp_flags & INP_TIMEWAIT)
712 goto out;
713 if (inp->inp_flags & INP_DROPPED) {
714 error = ECONNRESET;
715 goto out;
716 }
717 tp = intotcpcb(inp);
718 TCPDEBUG1();
719 tcp_disconnect(tp);
720 out:
721 TCPDEBUG2(PRU_DISCONNECT);
722 TCP_PROBE2(debug__user, tp, PRU_DISCONNECT);
723 INP_WUNLOCK(inp);
724 INP_INFO_RUNLOCK_ET(&V_tcbinfo, et);
725 return (error);
726 }
727
728 #ifdef INET
729 /*
730 * Accept a connection. Essentially all the work is done at higher levels;
731 * just return the address of the peer, storing through addr.
732 */
733 static int
tcp_usr_accept(struct socket * so,struct sockaddr ** nam)734 tcp_usr_accept(struct socket *so, struct sockaddr **nam)
735 {
736 int error = 0;
737 struct inpcb *inp = NULL;
738 struct tcpcb *tp = NULL;
739 struct in_addr addr;
740 in_port_t port = 0;
741 TCPDEBUG0;
742
743 if (so->so_state & SS_ISDISCONNECTED)
744 return (ECONNABORTED);
745
746 inp = sotoinpcb(so);
747 KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL"));
748 INP_WLOCK(inp);
749 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
750 error = ECONNABORTED;
751 goto out;
752 }
753 tp = intotcpcb(inp);
754 TCPDEBUG1();
755
756 /*
757 * We inline in_getpeeraddr and COMMON_END here, so that we can
758 * copy the data of interest and defer the malloc until after we
759 * release the lock.
760 */
761 port = inp->inp_fport;
762 addr = inp->inp_faddr;
763
764 out:
765 TCPDEBUG2(PRU_ACCEPT);
766 TCP_PROBE2(debug__user, tp, PRU_ACCEPT);
767 INP_WUNLOCK(inp);
768 if (error == 0)
769 *nam = in_sockaddr(port, &addr);
770 return error;
771 }
772 #endif /* INET */
773
774 #ifdef INET6
775 static int
tcp6_usr_accept(struct socket * so,struct sockaddr ** nam)776 tcp6_usr_accept(struct socket *so, struct sockaddr **nam)
777 {
778 struct inpcb *inp = NULL;
779 int error = 0;
780 struct tcpcb *tp = NULL;
781 struct in_addr addr;
782 struct in6_addr addr6;
783 struct epoch_tracker et;
784 in_port_t port = 0;
785 int v4 = 0;
786 TCPDEBUG0;
787
788 if (so->so_state & SS_ISDISCONNECTED)
789 return (ECONNABORTED);
790
791 inp = sotoinpcb(so);
792 KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL"));
793 INP_INFO_RLOCK_ET(&V_tcbinfo, et);
794 INP_WLOCK(inp);
795 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
796 error = ECONNABORTED;
797 goto out;
798 }
799 tp = intotcpcb(inp);
800 TCPDEBUG1();
801
802 /*
803 * We inline in6_mapped_peeraddr and COMMON_END here, so that we can
804 * copy the data of interest and defer the malloc until after we
805 * release the lock.
806 */
807 if (inp->inp_vflag & INP_IPV4) {
808 v4 = 1;
809 port = inp->inp_fport;
810 addr = inp->inp_faddr;
811 } else {
812 port = inp->inp_fport;
813 addr6 = inp->in6p_faddr;
814 }
815
816 out:
817 TCPDEBUG2(PRU_ACCEPT);
818 TCP_PROBE2(debug__user, tp, PRU_ACCEPT);
819 INP_WUNLOCK(inp);
820 INP_INFO_RUNLOCK_ET(&V_tcbinfo, et);
821 if (error == 0) {
822 if (v4)
823 *nam = in6_v4mapsin6_sockaddr(port, &addr);
824 else
825 *nam = in6_sockaddr(port, &addr6);
826 }
827 return error;
828 }
829 #endif /* INET6 */
830
831 /*
832 * Mark the connection as being incapable of further output.
833 */
834 static int
tcp_usr_shutdown(struct socket * so)835 tcp_usr_shutdown(struct socket *so)
836 {
837 int error = 0;
838 struct inpcb *inp;
839 struct tcpcb *tp = NULL;
840 struct epoch_tracker et;
841
842 TCPDEBUG0;
843 INP_INFO_RLOCK_ET(&V_tcbinfo, et);
844 inp = sotoinpcb(so);
845 KASSERT(inp != NULL, ("inp == NULL"));
846 INP_WLOCK(inp);
847 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
848 error = ECONNRESET;
849 goto out;
850 }
851 tp = intotcpcb(inp);
852 TCPDEBUG1();
853 socantsendmore(so);
854 tcp_usrclosed(tp);
855 if (!(inp->inp_flags & INP_DROPPED))
856 error = tp->t_fb->tfb_tcp_output(tp);
857
858 out:
859 TCPDEBUG2(PRU_SHUTDOWN);
860 TCP_PROBE2(debug__user, tp, PRU_SHUTDOWN);
861 INP_WUNLOCK(inp);
862 INP_INFO_RUNLOCK_ET(&V_tcbinfo, et);
863
864 return (error);
865 }
866
867 /*
868 * After a receive, possibly send window update to peer.
869 */
870 static int
tcp_usr_rcvd(struct socket * so,int flags)871 tcp_usr_rcvd(struct socket *so, int flags)
872 {
873 struct inpcb *inp;
874 struct tcpcb *tp = NULL;
875 int error = 0;
876
877 TCPDEBUG0;
878 inp = sotoinpcb(so);
879 KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL"));
880 INP_WLOCK(inp);
881 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
882 error = ECONNRESET;
883 goto out;
884 }
885 tp = intotcpcb(inp);
886 TCPDEBUG1();
887 /*
888 * For passively-created TFO connections, don't attempt a window
889 * update while still in SYN_RECEIVED as this may trigger an early
890 * SYN|ACK. It is preferable to have the SYN|ACK be sent along with
891 * application response data, or failing that, when the DELACK timer
892 * expires.
893 */
894 if (IS_FASTOPEN(tp->t_flags) &&
895 (tp->t_state == TCPS_SYN_RECEIVED))
896 goto out;
897 #ifdef TCP_OFFLOAD
898 if (tp->t_flags & TF_TOE)
899 tcp_offload_rcvd(tp);
900 else
901 #endif
902 tp->t_fb->tfb_tcp_output(tp);
903
904 out:
905 TCPDEBUG2(PRU_RCVD);
906 TCP_PROBE2(debug__user, tp, PRU_RCVD);
907 INP_WUNLOCK(inp);
908 return (error);
909 }
910
911 /*
912 * Do a send by putting data in output queue and updating urgent
913 * marker if URG set. Possibly send more data. Unlike the other
914 * pru_*() routines, the mbuf chains are our responsibility. We
915 * must either enqueue them or free them. The other pru_* routines
916 * generally are caller-frees.
917 */
918 static int
tcp_usr_send(struct socket * so,int flags,struct mbuf * m,struct sockaddr * nam,struct mbuf * control,struct thread * td)919 tcp_usr_send(struct socket *so, int flags, struct mbuf *m,
920 struct sockaddr *nam, struct mbuf *control, struct thread *td)
921 {
922 int error = 0;
923 struct inpcb *inp;
924 struct tcpcb *tp = NULL;
925 struct epoch_tracker net_et;
926 #ifdef INET
927 #ifdef INET6
928 struct sockaddr_in sin;
929 #endif
930 struct sockaddr_in *sinp;
931 #endif
932 #ifdef INET6
933 int isipv6;
934 #endif
935 u_int8_t incflagsav;
936 u_char vflagsav;
937 bool restoreflags;
938 TCPDEBUG0;
939
940 /*
941 * We require the pcbinfo lock if we will close the socket as part of
942 * this call.
943 */
944 if (flags & PRUS_EOF)
945 INP_INFO_RLOCK_ET(&V_tcbinfo, net_et);
946 inp = sotoinpcb(so);
947 KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL"));
948 INP_WLOCK(inp);
949 vflagsav = inp->inp_vflag;
950 incflagsav = inp->inp_inc.inc_flags;
951 restoreflags = false;
952 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
953 if (control)
954 m_freem(control);
955 /*
956 * In case of PRUS_NOTREADY, tcp_usr_ready() is responsible
957 * for freeing memory.
958 */
959 if (m && (flags & PRUS_NOTREADY) == 0)
960 m_freem(m);
961 error = ECONNRESET;
962 goto out;
963 }
964 tp = intotcpcb(inp);
965 TCPDEBUG1();
966 if (nam != NULL && tp->t_state < TCPS_SYN_SENT) {
967 switch (nam->sa_family) {
968 #ifdef INET
969 case AF_INET:
970 sinp = (struct sockaddr_in *)nam;
971 if (sinp->sin_len != sizeof(struct sockaddr_in)) {
972 if (m)
973 m_freem(m);
974 error = EINVAL;
975 goto out;
976 }
977 if ((inp->inp_vflag & INP_IPV6) != 0) {
978 if (m)
979 m_freem(m);
980 error = EAFNOSUPPORT;
981 goto out;
982 }
983 if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
984 if (m)
985 m_freem(m);
986 error = EAFNOSUPPORT;
987 goto out;
988 }
989 if ((error = prison_remote_ip4(td->td_ucred,
990 &sinp->sin_addr))) {
991 if (m)
992 m_freem(m);
993 goto out;
994 }
995 #ifdef INET6
996 isipv6 = 0;
997 #endif
998 break;
999 #endif /* INET */
1000 #ifdef INET6
1001 case AF_INET6:
1002 {
1003 struct sockaddr_in6 *sin6p;
1004
1005 sin6p = (struct sockaddr_in6 *)nam;
1006 if (sin6p->sin6_len != sizeof(struct sockaddr_in6)) {
1007 if (m)
1008 m_freem(m);
1009 error = EINVAL;
1010 goto out;
1011 }
1012 if (IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
1013 if (m)
1014 m_freem(m);
1015 error = EAFNOSUPPORT;
1016 goto out;
1017 }
1018 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
1019 #ifdef INET
1020 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
1021 error = EINVAL;
1022 if (m)
1023 m_freem(m);
1024 goto out;
1025 }
1026 if ((inp->inp_vflag & INP_IPV4) == 0) {
1027 error = EAFNOSUPPORT;
1028 if (m)
1029 m_freem(m);
1030 goto out;
1031 }
1032 restoreflags = true;
1033 inp->inp_vflag &= ~INP_IPV6;
1034 sinp = &sin;
1035 in6_sin6_2_sin(sinp, sin6p);
1036 if (IN_MULTICAST(
1037 ntohl(sinp->sin_addr.s_addr))) {
1038 error = EAFNOSUPPORT;
1039 if (m)
1040 m_freem(m);
1041 goto out;
1042 }
1043 if ((error = prison_remote_ip4(td->td_ucred,
1044 &sinp->sin_addr))) {
1045 if (m)
1046 m_freem(m);
1047 goto out;
1048 }
1049 isipv6 = 0;
1050 #else /* !INET */
1051 error = EAFNOSUPPORT;
1052 if (m)
1053 m_freem(m);
1054 goto out;
1055 #endif /* INET */
1056 } else {
1057 if ((inp->inp_vflag & INP_IPV6) == 0) {
1058 if (m)
1059 m_freem(m);
1060 error = EAFNOSUPPORT;
1061 goto out;
1062 }
1063 restoreflags = true;
1064 inp->inp_vflag &= ~INP_IPV4;
1065 inp->inp_inc.inc_flags |= INC_ISIPV6;
1066 if ((error = prison_remote_ip6(td->td_ucred,
1067 &sin6p->sin6_addr))) {
1068 if (m)
1069 m_freem(m);
1070 goto out;
1071 }
1072 isipv6 = 1;
1073 }
1074 break;
1075 }
1076 #endif /* INET6 */
1077 default:
1078 if (m)
1079 m_freem(m);
1080 error = EAFNOSUPPORT;
1081 goto out;
1082 }
1083 }
1084 if (control) {
1085 /* TCP doesn't do control messages (rights, creds, etc) */
1086 if (control->m_len) {
1087 m_freem(control);
1088 if (m)
1089 m_freem(m);
1090 error = EINVAL;
1091 goto out;
1092 }
1093 m_freem(control); /* empty control, just free it */
1094 }
1095 if (!(flags & PRUS_OOB)) {
1096 sbappendstream(&so->so_snd, m, flags);
1097 if (nam && tp->t_state < TCPS_SYN_SENT) {
1098 /*
1099 * Do implied connect if not yet connected,
1100 * initialize window to default value, and
1101 * initialize maxseg using peer's cached MSS.
1102 */
1103 #ifdef INET6
1104 if (isipv6)
1105 error = tcp6_connect(tp, nam, td);
1106 #endif /* INET6 */
1107 #if defined(INET6) && defined(INET)
1108 else
1109 #endif
1110 #ifdef INET
1111 error = tcp_connect(tp,
1112 (struct sockaddr *)sinp, td);
1113 #endif
1114 /*
1115 * The bind operation in tcp_connect succeeded. We
1116 * no longer want to restore the flags if later
1117 * operations fail.
1118 */
1119 if (error == 0 || inp->inp_lport != 0)
1120 restoreflags = false;
1121
1122 if (error)
1123 goto out;
1124 if (IS_FASTOPEN(tp->t_flags))
1125 tcp_fastopen_connect(tp);
1126 else {
1127 tp->snd_wnd = TTCP_CLIENT_SND_WND;
1128 tcp_mss(tp, -1);
1129 }
1130 }
1131 if (flags & PRUS_EOF) {
1132 /*
1133 * Close the send side of the connection after
1134 * the data is sent.
1135 */
1136 INP_INFO_RLOCK_ASSERT(&V_tcbinfo);
1137 socantsendmore(so);
1138 tcp_usrclosed(tp);
1139 }
1140 if (!(inp->inp_flags & INP_DROPPED) &&
1141 !(flags & PRUS_NOTREADY)) {
1142 if (flags & PRUS_MORETOCOME)
1143 tp->t_flags |= TF_MORETOCOME;
1144 error = tp->t_fb->tfb_tcp_output(tp);
1145 if (flags & PRUS_MORETOCOME)
1146 tp->t_flags &= ~TF_MORETOCOME;
1147 }
1148 } else {
1149 /*
1150 * XXXRW: PRUS_EOF not implemented with PRUS_OOB?
1151 */
1152 SOCKBUF_LOCK(&so->so_snd);
1153 if (sbspace(&so->so_snd) < -512) {
1154 SOCKBUF_UNLOCK(&so->so_snd);
1155 m_freem(m);
1156 error = ENOBUFS;
1157 goto out;
1158 }
1159 /*
1160 * According to RFC961 (Assigned Protocols),
1161 * the urgent pointer points to the last octet
1162 * of urgent data. We continue, however,
1163 * to consider it to indicate the first octet
1164 * of data past the urgent section.
1165 * Otherwise, snd_up should be one lower.
1166 */
1167 sbappendstream_locked(&so->so_snd, m, flags);
1168 SOCKBUF_UNLOCK(&so->so_snd);
1169 if (nam && tp->t_state < TCPS_SYN_SENT) {
1170 /*
1171 * Do implied connect if not yet connected,
1172 * initialize window to default value, and
1173 * initialize maxseg using peer's cached MSS.
1174 */
1175
1176 /*
1177 * Not going to contemplate SYN|URG
1178 */
1179 if (IS_FASTOPEN(tp->t_flags))
1180 tp->t_flags &= ~TF_FASTOPEN;
1181 #ifdef INET6
1182 if (isipv6)
1183 error = tcp6_connect(tp, nam, td);
1184 #endif /* INET6 */
1185 #if defined(INET6) && defined(INET)
1186 else
1187 #endif
1188 #ifdef INET
1189 error = tcp_connect(tp,
1190 (struct sockaddr *)sinp, td);
1191 #endif
1192 /*
1193 * The bind operation in tcp_connect succeeded. We
1194 * no longer want to restore the flags if later
1195 * operations fail.
1196 */
1197 if (error == 0 || inp->inp_lport != 0)
1198 restoreflags = false;
1199
1200 if (error)
1201 goto out;
1202 tp->snd_wnd = TTCP_CLIENT_SND_WND;
1203 tcp_mss(tp, -1);
1204 }
1205 tp->snd_up = tp->snd_una + sbavail(&so->so_snd);
1206 if (!(flags & PRUS_NOTREADY)) {
1207 tp->t_flags |= TF_FORCEDATA;
1208 error = tp->t_fb->tfb_tcp_output(tp);
1209 tp->t_flags &= ~TF_FORCEDATA;
1210 }
1211 }
1212 TCP_LOG_EVENT(tp, NULL,
1213 &inp->inp_socket->so_rcv,
1214 &inp->inp_socket->so_snd,
1215 TCP_LOG_USERSEND, error,
1216 0, NULL, false);
1217 out:
1218 /*
1219 * If the request was unsuccessful and we changed flags,
1220 * restore the original flags.
1221 */
1222 if (error != 0 && restoreflags) {
1223 inp->inp_vflag = vflagsav;
1224 inp->inp_inc.inc_flags = incflagsav;
1225 }
1226 TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB :
1227 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
1228 TCP_PROBE2(debug__user, tp, (flags & PRUS_OOB) ? PRU_SENDOOB :
1229 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
1230 INP_WUNLOCK(inp);
1231 if (flags & PRUS_EOF)
1232 INP_INFO_RUNLOCK_ET(&V_tcbinfo, net_et);
1233 return (error);
1234 }
1235
1236 static int
tcp_usr_ready(struct socket * so,struct mbuf * m,int count)1237 tcp_usr_ready(struct socket *so, struct mbuf *m, int count)
1238 {
1239 struct inpcb *inp;
1240 struct tcpcb *tp;
1241 int error;
1242
1243 inp = sotoinpcb(so);
1244 INP_WLOCK(inp);
1245 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1246 INP_WUNLOCK(inp);
1247 for (int i = 0; i < count; i++)
1248 m = m_free(m);
1249 return (ECONNRESET);
1250 }
1251 tp = intotcpcb(inp);
1252
1253 SOCKBUF_LOCK(&so->so_snd);
1254 error = sbready(&so->so_snd, m, count);
1255 SOCKBUF_UNLOCK(&so->so_snd);
1256 if (error == 0)
1257 error = tp->t_fb->tfb_tcp_output(tp);
1258 INP_WUNLOCK(inp);
1259
1260 return (error);
1261 }
1262
1263 /*
1264 * Abort the TCP. Drop the connection abruptly.
1265 */
1266 static void
tcp_usr_abort(struct socket * so)1267 tcp_usr_abort(struct socket *so)
1268 {
1269 struct inpcb *inp;
1270 struct tcpcb *tp = NULL;
1271 struct epoch_tracker et;
1272 TCPDEBUG0;
1273
1274 inp = sotoinpcb(so);
1275 KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL"));
1276
1277 INP_INFO_RLOCK_ET(&V_tcbinfo, et);
1278 INP_WLOCK(inp);
1279 KASSERT(inp->inp_socket != NULL,
1280 ("tcp_usr_abort: inp_socket == NULL"));
1281
1282 /*
1283 * If we still have full TCP state, and we're not dropped, drop.
1284 */
1285 if (!(inp->inp_flags & INP_TIMEWAIT) &&
1286 !(inp->inp_flags & INP_DROPPED)) {
1287 tp = intotcpcb(inp);
1288 TCPDEBUG1();
1289 tp = tcp_drop(tp, ECONNABORTED);
1290 if (tp == NULL)
1291 goto dropped;
1292 TCPDEBUG2(PRU_ABORT);
1293 TCP_PROBE2(debug__user, tp, PRU_ABORT);
1294 }
1295 if (!(inp->inp_flags & INP_DROPPED)) {
1296 SOCK_LOCK(so);
1297 so->so_state |= SS_PROTOREF;
1298 SOCK_UNLOCK(so);
1299 inp->inp_flags |= INP_SOCKREF;
1300 }
1301 INP_WUNLOCK(inp);
1302 dropped:
1303 INP_INFO_RUNLOCK_ET(&V_tcbinfo, et);
1304 }
1305
1306 /*
1307 * TCP socket is closed. Start friendly disconnect.
1308 */
1309 static void
tcp_usr_close(struct socket * so)1310 tcp_usr_close(struct socket *so)
1311 {
1312 struct inpcb *inp;
1313 struct tcpcb *tp = NULL;
1314 struct epoch_tracker et;
1315 TCPDEBUG0;
1316
1317 inp = sotoinpcb(so);
1318 KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL"));
1319
1320 INP_INFO_RLOCK_ET(&V_tcbinfo, et);
1321 INP_WLOCK(inp);
1322 KASSERT(inp->inp_socket != NULL,
1323 ("tcp_usr_close: inp_socket == NULL"));
1324
1325 /*
1326 * If we still have full TCP state, and we're not dropped, initiate
1327 * a disconnect.
1328 */
1329 if (!(inp->inp_flags & INP_TIMEWAIT) &&
1330 !(inp->inp_flags & INP_DROPPED)) {
1331 tp = intotcpcb(inp);
1332 TCPDEBUG1();
1333 tcp_disconnect(tp);
1334 TCPDEBUG2(PRU_CLOSE);
1335 TCP_PROBE2(debug__user, tp, PRU_CLOSE);
1336 }
1337 if (!(inp->inp_flags & INP_DROPPED)) {
1338 SOCK_LOCK(so);
1339 so->so_state |= SS_PROTOREF;
1340 SOCK_UNLOCK(so);
1341 inp->inp_flags |= INP_SOCKREF;
1342 }
1343 INP_WUNLOCK(inp);
1344 INP_INFO_RUNLOCK_ET(&V_tcbinfo, et);
1345 }
1346
1347 /*
1348 * Receive out-of-band data.
1349 */
1350 static int
tcp_usr_rcvoob(struct socket * so,struct mbuf * m,int flags)1351 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags)
1352 {
1353 int error = 0;
1354 struct inpcb *inp;
1355 struct tcpcb *tp = NULL;
1356
1357 TCPDEBUG0;
1358 inp = sotoinpcb(so);
1359 KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL"));
1360 INP_WLOCK(inp);
1361 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1362 error = ECONNRESET;
1363 goto out;
1364 }
1365 tp = intotcpcb(inp);
1366 TCPDEBUG1();
1367 if ((so->so_oobmark == 0 &&
1368 (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) ||
1369 so->so_options & SO_OOBINLINE ||
1370 tp->t_oobflags & TCPOOB_HADDATA) {
1371 error = EINVAL;
1372 goto out;
1373 }
1374 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
1375 error = EWOULDBLOCK;
1376 goto out;
1377 }
1378 m->m_len = 1;
1379 *mtod(m, caddr_t) = tp->t_iobc;
1380 if ((flags & MSG_PEEK) == 0)
1381 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
1382
1383 out:
1384 TCPDEBUG2(PRU_RCVOOB);
1385 TCP_PROBE2(debug__user, tp, PRU_RCVOOB);
1386 INP_WUNLOCK(inp);
1387 return (error);
1388 }
1389
1390 #ifdef INET
1391 struct pr_usrreqs tcp_usrreqs = {
1392 .pru_abort = tcp_usr_abort,
1393 .pru_accept = tcp_usr_accept,
1394 .pru_attach = tcp_usr_attach,
1395 .pru_bind = tcp_usr_bind,
1396 .pru_connect = tcp_usr_connect,
1397 .pru_control = in_control,
1398 .pru_detach = tcp_usr_detach,
1399 .pru_disconnect = tcp_usr_disconnect,
1400 .pru_listen = tcp_usr_listen,
1401 .pru_peeraddr = in_getpeeraddr,
1402 .pru_rcvd = tcp_usr_rcvd,
1403 .pru_rcvoob = tcp_usr_rcvoob,
1404 .pru_send = tcp_usr_send,
1405 .pru_ready = tcp_usr_ready,
1406 .pru_shutdown = tcp_usr_shutdown,
1407 .pru_sockaddr = in_getsockaddr,
1408 .pru_sosetlabel = in_pcbsosetlabel,
1409 .pru_close = tcp_usr_close,
1410 };
1411 #endif /* INET */
1412
1413 #ifdef INET6
1414 struct pr_usrreqs tcp6_usrreqs = {
1415 .pru_abort = tcp_usr_abort,
1416 .pru_accept = tcp6_usr_accept,
1417 .pru_attach = tcp_usr_attach,
1418 .pru_bind = tcp6_usr_bind,
1419 .pru_connect = tcp6_usr_connect,
1420 .pru_control = in6_control,
1421 .pru_detach = tcp_usr_detach,
1422 .pru_disconnect = tcp_usr_disconnect,
1423 .pru_listen = tcp6_usr_listen,
1424 .pru_peeraddr = in6_mapped_peeraddr,
1425 .pru_rcvd = tcp_usr_rcvd,
1426 .pru_rcvoob = tcp_usr_rcvoob,
1427 .pru_send = tcp_usr_send,
1428 .pru_ready = tcp_usr_ready,
1429 .pru_shutdown = tcp_usr_shutdown,
1430 .pru_sockaddr = in6_mapped_sockaddr,
1431 .pru_sosetlabel = in_pcbsosetlabel,
1432 .pru_close = tcp_usr_close,
1433 };
1434 #endif /* INET6 */
1435
1436 #ifdef INET
1437 /*
1438 * Common subroutine to open a TCP connection to remote host specified
1439 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local
1440 * port number if needed. Call in_pcbconnect_setup to do the routing and
1441 * to choose a local host address (interface). If there is an existing
1442 * incarnation of the same connection in TIME-WAIT state and if the remote
1443 * host was sending CC options and if the connection duration was < MSL, then
1444 * truncate the previous TIME-WAIT state and proceed.
1445 * Initialize connection parameters and enter SYN-SENT state.
1446 */
1447 static int
tcp_connect(struct tcpcb * tp,struct sockaddr * nam,struct thread * td)1448 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1449 {
1450 struct inpcb *inp = tp->t_inpcb, *oinp;
1451 struct socket *so = inp->inp_socket;
1452 struct in_addr laddr;
1453 u_short lport;
1454 int error;
1455
1456 INP_WLOCK_ASSERT(inp);
1457 INP_HASH_WLOCK(&V_tcbinfo);
1458
1459 if (inp->inp_lport == 0) {
1460 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1461 if (error)
1462 goto out;
1463 }
1464
1465 /*
1466 * Cannot simply call in_pcbconnect, because there might be an
1467 * earlier incarnation of this same connection still in
1468 * TIME_WAIT state, creating an ADDRINUSE error.
1469 */
1470 laddr = inp->inp_laddr;
1471 lport = inp->inp_lport;
1472 error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport,
1473 &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred);
1474 if (error && oinp == NULL)
1475 goto out;
1476 if (oinp) {
1477 error = EADDRINUSE;
1478 goto out;
1479 }
1480 inp->inp_laddr = laddr;
1481 in_pcbrehash(inp);
1482 INP_HASH_WUNLOCK(&V_tcbinfo);
1483
1484 /*
1485 * Compute window scaling to request:
1486 * Scale to fit into sweet spot. See tcp_syncache.c.
1487 * XXX: This should move to tcp_output().
1488 */
1489 while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1490 (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1491 tp->request_r_scale++;
1492
1493 soisconnecting(so);
1494 TCPSTAT_INC(tcps_connattempt);
1495 tcp_state_change(tp, TCPS_SYN_SENT);
1496 tp->iss = tcp_new_isn(&inp->inp_inc);
1497 if (tp->t_flags & TF_REQ_TSTMP)
1498 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc);
1499 tcp_sendseqinit(tp);
1500
1501 return 0;
1502
1503 out:
1504 INP_HASH_WUNLOCK(&V_tcbinfo);
1505 return (error);
1506 }
1507 #endif /* INET */
1508
1509 #ifdef INET6
1510 static int
tcp6_connect(struct tcpcb * tp,struct sockaddr * nam,struct thread * td)1511 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1512 {
1513 struct inpcb *inp = tp->t_inpcb;
1514 int error;
1515
1516 INP_WLOCK_ASSERT(inp);
1517 INP_HASH_WLOCK(&V_tcbinfo);
1518
1519 if (inp->inp_lport == 0) {
1520 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1521 if (error)
1522 goto out;
1523 }
1524 error = in6_pcbconnect(inp, nam, td->td_ucred);
1525 if (error != 0)
1526 goto out;
1527 INP_HASH_WUNLOCK(&V_tcbinfo);
1528
1529 /* Compute window scaling to request. */
1530 while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1531 (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1532 tp->request_r_scale++;
1533
1534 soisconnecting(inp->inp_socket);
1535 TCPSTAT_INC(tcps_connattempt);
1536 tcp_state_change(tp, TCPS_SYN_SENT);
1537 tp->iss = tcp_new_isn(&inp->inp_inc);
1538 if (tp->t_flags & TF_REQ_TSTMP)
1539 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc);
1540 tcp_sendseqinit(tp);
1541
1542 return 0;
1543
1544 out:
1545 INP_HASH_WUNLOCK(&V_tcbinfo);
1546 return error;
1547 }
1548 #endif /* INET6 */
1549
1550 /*
1551 * Export TCP internal state information via a struct tcp_info, based on the
1552 * Linux 2.6 API. Not ABI compatible as our constants are mapped differently
1553 * (TCP state machine, etc). We export all information using FreeBSD-native
1554 * constants -- for example, the numeric values for tcpi_state will differ
1555 * from Linux.
1556 */
1557 static void
tcp_fill_info(struct tcpcb * tp,struct tcp_info * ti)1558 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti)
1559 {
1560
1561 INP_WLOCK_ASSERT(tp->t_inpcb);
1562 bzero(ti, sizeof(*ti));
1563
1564 ti->tcpi_state = tp->t_state;
1565 if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP))
1566 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS;
1567 if (tp->t_flags & TF_SACK_PERMIT)
1568 ti->tcpi_options |= TCPI_OPT_SACK;
1569 if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) {
1570 ti->tcpi_options |= TCPI_OPT_WSCALE;
1571 ti->tcpi_snd_wscale = tp->snd_scale;
1572 ti->tcpi_rcv_wscale = tp->rcv_scale;
1573 }
1574 if (tp->t_flags & TF_ECN_PERMIT)
1575 ti->tcpi_options |= TCPI_OPT_ECN;
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 #ifdef TCP_OFFLOAD
1599 if (tp->t_flags & TF_TOE) {
1600 ti->tcpi_options |= TCPI_OPT_TOE;
1601 tcp_offload_tcp_info(tp, ti);
1602 }
1603 #endif
1604 }
1605
1606 /*
1607 * tcp_ctloutput() must drop the inpcb lock before performing copyin on
1608 * socket option arguments. When it re-acquires the lock after the copy, it
1609 * has to revalidate that the connection is still valid for the socket
1610 * option.
1611 */
1612 #define INP_WLOCK_RECHECK_CLEANUP(inp, cleanup) do { \
1613 INP_WLOCK(inp); \
1614 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { \
1615 INP_WUNLOCK(inp); \
1616 cleanup; \
1617 return (ECONNRESET); \
1618 } \
1619 tp = intotcpcb(inp); \
1620 } while(0)
1621 #define INP_WLOCK_RECHECK(inp) INP_WLOCK_RECHECK_CLEANUP((inp), /* noop */)
1622
1623 int
tcp_ctloutput(struct socket * so,struct sockopt * sopt)1624 tcp_ctloutput(struct socket *so, struct sockopt *sopt)
1625 {
1626 int error;
1627 struct inpcb *inp;
1628 struct tcpcb *tp;
1629 struct tcp_function_block *blk;
1630 struct tcp_function_set fsn;
1631
1632 error = 0;
1633 inp = sotoinpcb(so);
1634 KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL"));
1635 if (sopt->sopt_level != IPPROTO_TCP) {
1636 #ifdef INET6
1637 if (inp->inp_vflag & INP_IPV6PROTO) {
1638 error = ip6_ctloutput(so, sopt);
1639 /*
1640 * In case of the IPV6_USE_MIN_MTU socket option,
1641 * the INC_IPV6MINMTU flag to announce a corresponding
1642 * MSS during the initial handshake.
1643 * If the TCP connection is not in the front states,
1644 * just reduce the MSS being used.
1645 * This avoids the sending of TCP segments which will
1646 * be fragmented at the IPv6 layer.
1647 */
1648 if ((error == 0) &&
1649 (sopt->sopt_dir == SOPT_SET) &&
1650 (sopt->sopt_level == IPPROTO_IPV6) &&
1651 (sopt->sopt_name == IPV6_USE_MIN_MTU)) {
1652 INP_WLOCK(inp);
1653 if ((inp->inp_flags &
1654 (INP_TIMEWAIT | INP_DROPPED))) {
1655 INP_WUNLOCK(inp);
1656 return (ECONNRESET);
1657 }
1658 inp->inp_inc.inc_flags |= INC_IPV6MINMTU;
1659 tp = intotcpcb(inp);
1660 if ((tp->t_state >= TCPS_SYN_SENT) &&
1661 (inp->inp_inc.inc_flags & INC_ISIPV6)) {
1662 struct ip6_pktopts *opt;
1663
1664 opt = inp->in6p_outputopts;
1665 if ((opt != NULL) &&
1666 (opt->ip6po_minmtu ==
1667 IP6PO_MINMTU_ALL)) {
1668 if (tp->t_maxseg > TCP6_MSS) {
1669 tp->t_maxseg = TCP6_MSS;
1670 }
1671 }
1672 }
1673 INP_WUNLOCK(inp);
1674 }
1675 }
1676 #endif /* INET6 */
1677 #if defined(INET6) && defined(INET)
1678 else
1679 #endif
1680 #ifdef INET
1681 {
1682 error = ip_ctloutput(so, sopt);
1683 }
1684 #endif
1685 return (error);
1686 }
1687 INP_WLOCK(inp);
1688 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1689 INP_WUNLOCK(inp);
1690 return (ECONNRESET);
1691 }
1692 tp = intotcpcb(inp);
1693 /*
1694 * Protect the TCP option TCP_FUNCTION_BLK so
1695 * that a sub-function can *never* overwrite this.
1696 */
1697 if ((sopt->sopt_dir == SOPT_SET) &&
1698 (sopt->sopt_name == TCP_FUNCTION_BLK)) {
1699 INP_WUNLOCK(inp);
1700 error = sooptcopyin(sopt, &fsn, sizeof fsn,
1701 sizeof fsn);
1702 if (error)
1703 return (error);
1704 INP_WLOCK_RECHECK(inp);
1705 blk = find_and_ref_tcp_functions(&fsn);
1706 if (blk == NULL) {
1707 INP_WUNLOCK(inp);
1708 return (ENOENT);
1709 }
1710 if (tp->t_fb == blk) {
1711 /* You already have this */
1712 refcount_release(&blk->tfb_refcnt);
1713 INP_WUNLOCK(inp);
1714 return (0);
1715 }
1716 if (tp->t_state != TCPS_CLOSED) {
1717 /*
1718 * The user has advanced the state
1719 * past the initial point, we may not
1720 * be able to switch.
1721 */
1722 if (blk->tfb_tcp_handoff_ok != NULL) {
1723 /*
1724 * Does the stack provide a
1725 * query mechanism, if so it may
1726 * still be possible?
1727 */
1728 error = (*blk->tfb_tcp_handoff_ok)(tp);
1729 } else
1730 error = EINVAL;
1731 if (error) {
1732 refcount_release(&blk->tfb_refcnt);
1733 INP_WUNLOCK(inp);
1734 return(error);
1735 }
1736 }
1737 if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) {
1738 refcount_release(&blk->tfb_refcnt);
1739 INP_WUNLOCK(inp);
1740 return (ENOENT);
1741 }
1742 /*
1743 * Release the old refcnt, the
1744 * lookup acquired a ref on the
1745 * new one already.
1746 */
1747 if (tp->t_fb->tfb_tcp_fb_fini) {
1748 /*
1749 * Tell the stack to cleanup with 0 i.e.
1750 * the tcb is not going away.
1751 */
1752 (*tp->t_fb->tfb_tcp_fb_fini)(tp, 0);
1753 }
1754 #ifdef TCPHPTS
1755 /* Assure that we are not on any hpts */
1756 tcp_hpts_remove(tp->t_inpcb, HPTS_REMOVE_ALL);
1757 #endif
1758 if (blk->tfb_tcp_fb_init) {
1759 error = (*blk->tfb_tcp_fb_init)(tp);
1760 if (error) {
1761 refcount_release(&blk->tfb_refcnt);
1762 if (tp->t_fb->tfb_tcp_fb_init) {
1763 if((*tp->t_fb->tfb_tcp_fb_init)(tp) != 0) {
1764 /* Fall back failed, drop the connection */
1765 INP_WUNLOCK(inp);
1766 soabort(so);
1767 return(error);
1768 }
1769 }
1770 goto err_out;
1771 }
1772 }
1773 refcount_release(&tp->t_fb->tfb_refcnt);
1774 tp->t_fb = blk;
1775 #ifdef TCP_OFFLOAD
1776 if (tp->t_flags & TF_TOE) {
1777 tcp_offload_ctloutput(tp, sopt->sopt_dir,
1778 sopt->sopt_name);
1779 }
1780 #endif
1781 err_out:
1782 INP_WUNLOCK(inp);
1783 return (error);
1784 } else if ((sopt->sopt_dir == SOPT_GET) &&
1785 (sopt->sopt_name == TCP_FUNCTION_BLK)) {
1786 strncpy(fsn.function_set_name, tp->t_fb->tfb_tcp_block_name,
1787 TCP_FUNCTION_NAME_LEN_MAX);
1788 fsn.function_set_name[TCP_FUNCTION_NAME_LEN_MAX - 1] = '\0';
1789 fsn.pcbcnt = tp->t_fb->tfb_refcnt;
1790 INP_WUNLOCK(inp);
1791 error = sooptcopyout(sopt, &fsn, sizeof fsn);
1792 return (error);
1793 }
1794 /* Pass in the INP locked, called must unlock it */
1795 return (tp->t_fb->tfb_tcp_ctloutput(so, sopt, inp, tp));
1796 }
1797
1798 /*
1799 * If this assert becomes untrue, we need to change the size of the buf
1800 * variable in tcp_default_ctloutput().
1801 */
1802 #ifdef CTASSERT
1803 CTASSERT(TCP_CA_NAME_MAX <= TCP_LOG_ID_LEN);
1804 CTASSERT(TCP_LOG_REASON_LEN <= TCP_LOG_ID_LEN);
1805 #endif
1806
1807 int
tcp_default_ctloutput(struct socket * so,struct sockopt * sopt,struct inpcb * inp,struct tcpcb * tp)1808 tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp)
1809 {
1810 int error, opt, optval;
1811 u_int ui;
1812 struct tcp_info ti;
1813 struct cc_algo *algo;
1814 char *pbuf, buf[TCP_LOG_ID_LEN];
1815 size_t len;
1816
1817 /*
1818 * For TCP_CCALGOOPT forward the control to CC module, for both
1819 * SOPT_SET and SOPT_GET.
1820 */
1821 switch (sopt->sopt_name) {
1822 case TCP_CCALGOOPT:
1823 INP_WUNLOCK(inp);
1824 if (sopt->sopt_valsize > CC_ALGOOPT_LIMIT)
1825 return (EINVAL);
1826 pbuf = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK | M_ZERO);
1827 error = sooptcopyin(sopt, pbuf, sopt->sopt_valsize,
1828 sopt->sopt_valsize);
1829 if (error) {
1830 free(pbuf, M_TEMP);
1831 return (error);
1832 }
1833 INP_WLOCK_RECHECK_CLEANUP(inp, free(pbuf, M_TEMP));
1834 if (CC_ALGO(tp)->ctl_output != NULL)
1835 error = CC_ALGO(tp)->ctl_output(tp->ccv, sopt, pbuf);
1836 else
1837 error = ENOENT;
1838 INP_WUNLOCK(inp);
1839 if (error == 0 && sopt->sopt_dir == SOPT_GET)
1840 error = sooptcopyout(sopt, pbuf, sopt->sopt_valsize);
1841 free(pbuf, M_TEMP);
1842 return (error);
1843 }
1844
1845 switch (sopt->sopt_dir) {
1846 case SOPT_SET:
1847 switch (sopt->sopt_name) {
1848 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
1849 case TCP_MD5SIG:
1850 if (!TCPMD5_ENABLED()) {
1851 INP_WUNLOCK(inp);
1852 return (ENOPROTOOPT);
1853 }
1854 error = TCPMD5_PCBCTL(inp, sopt);
1855 if (error)
1856 return (error);
1857 goto unlock_and_done;
1858 #endif /* IPSEC */
1859
1860 case TCP_NODELAY:
1861 case TCP_NOOPT:
1862 INP_WUNLOCK(inp);
1863 error = sooptcopyin(sopt, &optval, sizeof optval,
1864 sizeof optval);
1865 if (error)
1866 return (error);
1867
1868 INP_WLOCK_RECHECK(inp);
1869 switch (sopt->sopt_name) {
1870 case TCP_NODELAY:
1871 opt = TF_NODELAY;
1872 break;
1873 case TCP_NOOPT:
1874 opt = TF_NOOPT;
1875 break;
1876 default:
1877 opt = 0; /* dead code to fool gcc */
1878 break;
1879 }
1880
1881 if (optval)
1882 tp->t_flags |= opt;
1883 else
1884 tp->t_flags &= ~opt;
1885 unlock_and_done:
1886 #ifdef TCP_OFFLOAD
1887 if (tp->t_flags & TF_TOE) {
1888 tcp_offload_ctloutput(tp, sopt->sopt_dir,
1889 sopt->sopt_name);
1890 }
1891 #endif
1892 INP_WUNLOCK(inp);
1893 break;
1894
1895 case TCP_NOPUSH:
1896 INP_WUNLOCK(inp);
1897 error = sooptcopyin(sopt, &optval, sizeof optval,
1898 sizeof optval);
1899 if (error)
1900 return (error);
1901
1902 INP_WLOCK_RECHECK(inp);
1903 if (optval)
1904 tp->t_flags |= TF_NOPUSH;
1905 else if (tp->t_flags & TF_NOPUSH) {
1906 tp->t_flags &= ~TF_NOPUSH;
1907 if (TCPS_HAVEESTABLISHED(tp->t_state))
1908 error = tp->t_fb->tfb_tcp_output(tp);
1909 }
1910 goto unlock_and_done;
1911
1912 case TCP_MAXSEG:
1913 INP_WUNLOCK(inp);
1914 error = sooptcopyin(sopt, &optval, sizeof optval,
1915 sizeof optval);
1916 if (error)
1917 return (error);
1918
1919 INP_WLOCK_RECHECK(inp);
1920 if (optval > 0 && optval <= tp->t_maxseg &&
1921 optval + 40 >= V_tcp_minmss)
1922 tp->t_maxseg = optval;
1923 else
1924 error = EINVAL;
1925 goto unlock_and_done;
1926
1927 case TCP_INFO:
1928 INP_WUNLOCK(inp);
1929 error = EINVAL;
1930 break;
1931
1932 case TCP_CONGESTION:
1933 INP_WUNLOCK(inp);
1934 error = sooptcopyin(sopt, buf, TCP_CA_NAME_MAX - 1, 1);
1935 if (error)
1936 break;
1937 buf[sopt->sopt_valsize] = '\0';
1938 INP_WLOCK_RECHECK(inp);
1939 CC_LIST_RLOCK();
1940 STAILQ_FOREACH(algo, &cc_list, entries)
1941 if (strncmp(buf, algo->name,
1942 TCP_CA_NAME_MAX) == 0)
1943 break;
1944 CC_LIST_RUNLOCK();
1945 if (algo == NULL) {
1946 INP_WUNLOCK(inp);
1947 error = EINVAL;
1948 break;
1949 }
1950 /*
1951 * We hold a write lock over the tcb so it's safe to
1952 * do these things without ordering concerns.
1953 */
1954 if (CC_ALGO(tp)->cb_destroy != NULL)
1955 CC_ALGO(tp)->cb_destroy(tp->ccv);
1956 CC_DATA(tp) = NULL;
1957 CC_ALGO(tp) = algo;
1958 /*
1959 * If something goes pear shaped initialising the new
1960 * algo, fall back to newreno (which does not
1961 * require initialisation).
1962 */
1963 if (algo->cb_init != NULL &&
1964 algo->cb_init(tp->ccv) != 0) {
1965 CC_ALGO(tp) = &newreno_cc_algo;
1966 /*
1967 * The only reason init should fail is
1968 * because of malloc.
1969 */
1970 error = ENOMEM;
1971 }
1972 INP_WUNLOCK(inp);
1973 break;
1974
1975 case TCP_KEEPIDLE:
1976 case TCP_KEEPINTVL:
1977 case TCP_KEEPINIT:
1978 INP_WUNLOCK(inp);
1979 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
1980 if (error)
1981 return (error);
1982
1983 if (ui > (UINT_MAX / hz)) {
1984 error = EINVAL;
1985 break;
1986 }
1987 ui *= hz;
1988
1989 INP_WLOCK_RECHECK(inp);
1990 switch (sopt->sopt_name) {
1991 case TCP_KEEPIDLE:
1992 tp->t_keepidle = ui;
1993 /*
1994 * XXX: better check current remaining
1995 * timeout and "merge" it with new value.
1996 */
1997 if ((tp->t_state > TCPS_LISTEN) &&
1998 (tp->t_state <= TCPS_CLOSING))
1999 tcp_timer_activate(tp, TT_KEEP,
2000 TP_KEEPIDLE(tp));
2001 break;
2002 case TCP_KEEPINTVL:
2003 tp->t_keepintvl = ui;
2004 if ((tp->t_state == TCPS_FIN_WAIT_2) &&
2005 (TP_MAXIDLE(tp) > 0))
2006 tcp_timer_activate(tp, TT_2MSL,
2007 TP_MAXIDLE(tp));
2008 break;
2009 case TCP_KEEPINIT:
2010 tp->t_keepinit = ui;
2011 if (tp->t_state == TCPS_SYN_RECEIVED ||
2012 tp->t_state == TCPS_SYN_SENT)
2013 tcp_timer_activate(tp, TT_KEEP,
2014 TP_KEEPINIT(tp));
2015 break;
2016 }
2017 goto unlock_and_done;
2018
2019 case TCP_KEEPCNT:
2020 INP_WUNLOCK(inp);
2021 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
2022 if (error)
2023 return (error);
2024
2025 INP_WLOCK_RECHECK(inp);
2026 tp->t_keepcnt = ui;
2027 if ((tp->t_state == TCPS_FIN_WAIT_2) &&
2028 (TP_MAXIDLE(tp) > 0))
2029 tcp_timer_activate(tp, TT_2MSL,
2030 TP_MAXIDLE(tp));
2031 goto unlock_and_done;
2032
2033 #ifdef TCPPCAP
2034 case TCP_PCAP_OUT:
2035 case TCP_PCAP_IN:
2036 INP_WUNLOCK(inp);
2037 error = sooptcopyin(sopt, &optval, sizeof optval,
2038 sizeof optval);
2039 if (error)
2040 return (error);
2041
2042 INP_WLOCK_RECHECK(inp);
2043 if (optval >= 0)
2044 tcp_pcap_set_sock_max(TCP_PCAP_OUT ?
2045 &(tp->t_outpkts) : &(tp->t_inpkts),
2046 optval);
2047 else
2048 error = EINVAL;
2049 goto unlock_and_done;
2050 #endif
2051
2052 case TCP_FASTOPEN: {
2053 struct tcp_fastopen tfo_optval;
2054
2055 INP_WUNLOCK(inp);
2056 if (!V_tcp_fastopen_client_enable &&
2057 !V_tcp_fastopen_server_enable)
2058 return (EPERM);
2059
2060 error = sooptcopyin(sopt, &tfo_optval,
2061 sizeof(tfo_optval), sizeof(int));
2062 if (error)
2063 return (error);
2064
2065 INP_WLOCK_RECHECK(inp);
2066 if (tfo_optval.enable) {
2067 if (tp->t_state == TCPS_LISTEN) {
2068 if (!V_tcp_fastopen_server_enable) {
2069 error = EPERM;
2070 goto unlock_and_done;
2071 }
2072
2073 tp->t_flags |= TF_FASTOPEN;
2074 if (tp->t_tfo_pending == NULL)
2075 tp->t_tfo_pending =
2076 tcp_fastopen_alloc_counter();
2077 } else {
2078 /*
2079 * If a pre-shared key was provided,
2080 * stash it in the client cookie
2081 * field of the tcpcb for use during
2082 * connect.
2083 */
2084 if (sopt->sopt_valsize ==
2085 sizeof(tfo_optval)) {
2086 memcpy(tp->t_tfo_cookie.client,
2087 tfo_optval.psk,
2088 TCP_FASTOPEN_PSK_LEN);
2089 tp->t_tfo_client_cookie_len =
2090 TCP_FASTOPEN_PSK_LEN;
2091 }
2092 tp->t_flags |= TF_FASTOPEN;
2093 }
2094 } else
2095 tp->t_flags &= ~TF_FASTOPEN;
2096 goto unlock_and_done;
2097 }
2098
2099 #ifdef TCP_BLACKBOX
2100 case TCP_LOG:
2101 INP_WUNLOCK(inp);
2102 error = sooptcopyin(sopt, &optval, sizeof optval,
2103 sizeof optval);
2104 if (error)
2105 return (error);
2106
2107 INP_WLOCK_RECHECK(inp);
2108 error = tcp_log_state_change(tp, optval);
2109 goto unlock_and_done;
2110
2111 case TCP_LOGBUF:
2112 INP_WUNLOCK(inp);
2113 error = EINVAL;
2114 break;
2115
2116 case TCP_LOGID:
2117 INP_WUNLOCK(inp);
2118 error = sooptcopyin(sopt, buf, TCP_LOG_ID_LEN - 1, 0);
2119 if (error)
2120 break;
2121 buf[sopt->sopt_valsize] = '\0';
2122 INP_WLOCK_RECHECK(inp);
2123 error = tcp_log_set_id(tp, buf);
2124 /* tcp_log_set_id() unlocks the INP. */
2125 break;
2126
2127 case TCP_LOGDUMP:
2128 case TCP_LOGDUMPID:
2129 INP_WUNLOCK(inp);
2130 error =
2131 sooptcopyin(sopt, buf, TCP_LOG_REASON_LEN - 1, 0);
2132 if (error)
2133 break;
2134 buf[sopt->sopt_valsize] = '\0';
2135 INP_WLOCK_RECHECK(inp);
2136 if (sopt->sopt_name == TCP_LOGDUMP) {
2137 error = tcp_log_dump_tp_logbuf(tp, buf,
2138 M_WAITOK, true);
2139 INP_WUNLOCK(inp);
2140 } else {
2141 tcp_log_dump_tp_bucket_logbufs(tp, buf);
2142 /*
2143 * tcp_log_dump_tp_bucket_logbufs() drops the
2144 * INP lock.
2145 */
2146 }
2147 break;
2148 #endif
2149
2150 default:
2151 INP_WUNLOCK(inp);
2152 error = ENOPROTOOPT;
2153 break;
2154 }
2155 break;
2156
2157 case SOPT_GET:
2158 tp = intotcpcb(inp);
2159 switch (sopt->sopt_name) {
2160 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
2161 case TCP_MD5SIG:
2162 if (!TCPMD5_ENABLED()) {
2163 INP_WUNLOCK(inp);
2164 return (ENOPROTOOPT);
2165 }
2166 error = TCPMD5_PCBCTL(inp, sopt);
2167 break;
2168 #endif
2169
2170 case TCP_NODELAY:
2171 optval = tp->t_flags & TF_NODELAY;
2172 INP_WUNLOCK(inp);
2173 error = sooptcopyout(sopt, &optval, sizeof optval);
2174 break;
2175 case TCP_MAXSEG:
2176 optval = tp->t_maxseg;
2177 INP_WUNLOCK(inp);
2178 error = sooptcopyout(sopt, &optval, sizeof optval);
2179 break;
2180 case TCP_NOOPT:
2181 optval = tp->t_flags & TF_NOOPT;
2182 INP_WUNLOCK(inp);
2183 error = sooptcopyout(sopt, &optval, sizeof optval);
2184 break;
2185 case TCP_NOPUSH:
2186 optval = tp->t_flags & TF_NOPUSH;
2187 INP_WUNLOCK(inp);
2188 error = sooptcopyout(sopt, &optval, sizeof optval);
2189 break;
2190 case TCP_INFO:
2191 tcp_fill_info(tp, &ti);
2192 INP_WUNLOCK(inp);
2193 error = sooptcopyout(sopt, &ti, sizeof ti);
2194 break;
2195 case TCP_CONGESTION:
2196 len = strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX);
2197 INP_WUNLOCK(inp);
2198 error = sooptcopyout(sopt, buf, len + 1);
2199 break;
2200 case TCP_KEEPIDLE:
2201 case TCP_KEEPINTVL:
2202 case TCP_KEEPINIT:
2203 case TCP_KEEPCNT:
2204 switch (sopt->sopt_name) {
2205 case TCP_KEEPIDLE:
2206 ui = TP_KEEPIDLE(tp) / hz;
2207 break;
2208 case TCP_KEEPINTVL:
2209 ui = TP_KEEPINTVL(tp) / hz;
2210 break;
2211 case TCP_KEEPINIT:
2212 ui = TP_KEEPINIT(tp) / hz;
2213 break;
2214 case TCP_KEEPCNT:
2215 ui = TP_KEEPCNT(tp);
2216 break;
2217 }
2218 INP_WUNLOCK(inp);
2219 error = sooptcopyout(sopt, &ui, sizeof(ui));
2220 break;
2221 #ifdef TCPPCAP
2222 case TCP_PCAP_OUT:
2223 case TCP_PCAP_IN:
2224 optval = tcp_pcap_get_sock_max(TCP_PCAP_OUT ?
2225 &(tp->t_outpkts) : &(tp->t_inpkts));
2226 INP_WUNLOCK(inp);
2227 error = sooptcopyout(sopt, &optval, sizeof optval);
2228 break;
2229 #endif
2230 case TCP_FASTOPEN:
2231 optval = tp->t_flags & TF_FASTOPEN;
2232 INP_WUNLOCK(inp);
2233 error = sooptcopyout(sopt, &optval, sizeof optval);
2234 break;
2235 #ifdef TCP_BLACKBOX
2236 case TCP_LOG:
2237 optval = tp->t_logstate;
2238 INP_WUNLOCK(inp);
2239 error = sooptcopyout(sopt, &optval, sizeof(optval));
2240 break;
2241 case TCP_LOGBUF:
2242 /* tcp_log_getlogbuf() does INP_WUNLOCK(inp) */
2243 error = tcp_log_getlogbuf(sopt, tp);
2244 break;
2245 case TCP_LOGID:
2246 len = tcp_log_get_id(tp, buf);
2247 INP_WUNLOCK(inp);
2248 error = sooptcopyout(sopt, buf, len + 1);
2249 break;
2250 case TCP_LOGDUMP:
2251 case TCP_LOGDUMPID:
2252 INP_WUNLOCK(inp);
2253 error = EINVAL;
2254 break;
2255 #endif
2256 default:
2257 INP_WUNLOCK(inp);
2258 error = ENOPROTOOPT;
2259 break;
2260 }
2261 break;
2262 }
2263 return (error);
2264 }
2265 #undef INP_WLOCK_RECHECK
2266 #undef INP_WLOCK_RECHECK_CLEANUP
2267
2268 /*
2269 * Attach TCP protocol to socket, allocating
2270 * internet protocol control block, tcp control block,
2271 * bufer space, and entering LISTEN state if to accept connections.
2272 */
2273 static int
tcp_attach(struct socket * so)2274 tcp_attach(struct socket *so)
2275 {
2276 struct tcpcb *tp;
2277 struct inpcb *inp;
2278 struct epoch_tracker et;
2279 int error;
2280
2281 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
2282 error = soreserve(so, V_tcp_sendspace, V_tcp_recvspace);
2283 if (error)
2284 return (error);
2285 }
2286 so->so_rcv.sb_flags |= SB_AUTOSIZE;
2287 so->so_snd.sb_flags |= SB_AUTOSIZE;
2288 INP_INFO_RLOCK_ET(&V_tcbinfo, et);
2289 error = in_pcballoc(so, &V_tcbinfo);
2290 if (error) {
2291 INP_INFO_RUNLOCK_ET(&V_tcbinfo, et);
2292 return (error);
2293 }
2294 inp = sotoinpcb(so);
2295 #ifdef INET6
2296 if (inp->inp_vflag & INP_IPV6PROTO) {
2297 inp->inp_vflag |= INP_IPV6;
2298 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
2299 inp->inp_vflag |= INP_IPV4;
2300 inp->in6p_hops = -1; /* use kernel default */
2301 }
2302 else
2303 #endif
2304 inp->inp_vflag |= INP_IPV4;
2305 tp = tcp_newtcpcb(inp);
2306 if (tp == NULL) {
2307 in_pcbdetach(inp);
2308 in_pcbfree(inp);
2309 INP_INFO_RUNLOCK_ET(&V_tcbinfo, et);
2310 return (ENOBUFS);
2311 }
2312 tp->t_state = TCPS_CLOSED;
2313 INP_WUNLOCK(inp);
2314 INP_INFO_RUNLOCK_ET(&V_tcbinfo, et);
2315 TCPSTATES_INC(TCPS_CLOSED);
2316 return (0);
2317 }
2318
2319 /*
2320 * Initiate (or continue) disconnect.
2321 * If embryonic state, just send reset (once).
2322 * If in ``let data drain'' option and linger null, just drop.
2323 * Otherwise (hard), mark socket disconnecting and drop
2324 * current input data; switch states based on user close, and
2325 * send segment to peer (with FIN).
2326 */
2327 static void
tcp_disconnect(struct tcpcb * tp)2328 tcp_disconnect(struct tcpcb *tp)
2329 {
2330 struct inpcb *inp = tp->t_inpcb;
2331 struct socket *so = inp->inp_socket;
2332
2333 INP_INFO_RLOCK_ASSERT(&V_tcbinfo);
2334 INP_WLOCK_ASSERT(inp);
2335
2336 /*
2337 * Neither tcp_close() nor tcp_drop() should return NULL, as the
2338 * socket is still open.
2339 */
2340 if (tp->t_state < TCPS_ESTABLISHED &&
2341 !(tp->t_state > TCPS_LISTEN && IS_FASTOPEN(tp->t_flags))) {
2342 tp = tcp_close(tp);
2343 KASSERT(tp != NULL,
2344 ("tcp_disconnect: tcp_close() returned NULL"));
2345 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
2346 tp = tcp_drop(tp, 0);
2347 KASSERT(tp != NULL,
2348 ("tcp_disconnect: tcp_drop() returned NULL"));
2349 } else {
2350 soisdisconnecting(so);
2351 sbflush(&so->so_rcv);
2352 tcp_usrclosed(tp);
2353 if (!(inp->inp_flags & INP_DROPPED))
2354 tp->t_fb->tfb_tcp_output(tp);
2355 }
2356 }
2357
2358 /*
2359 * User issued close, and wish to trail through shutdown states:
2360 * if never received SYN, just forget it. If got a SYN from peer,
2361 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
2362 * If already got a FIN from peer, then almost done; go to LAST_ACK
2363 * state. In all other cases, have already sent FIN to peer (e.g.
2364 * after PRU_SHUTDOWN), and just have to play tedious game waiting
2365 * for peer to send FIN or not respond to keep-alives, etc.
2366 * We can let the user exit from the close as soon as the FIN is acked.
2367 */
2368 static void
tcp_usrclosed(struct tcpcb * tp)2369 tcp_usrclosed(struct tcpcb *tp)
2370 {
2371
2372 INP_INFO_RLOCK_ASSERT(&V_tcbinfo);
2373 INP_WLOCK_ASSERT(tp->t_inpcb);
2374
2375 switch (tp->t_state) {
2376 case TCPS_LISTEN:
2377 #ifdef TCP_OFFLOAD
2378 tcp_offload_listen_stop(tp);
2379 #endif
2380 tcp_state_change(tp, TCPS_CLOSED);
2381 /* FALLTHROUGH */
2382 case TCPS_CLOSED:
2383 tp = tcp_close(tp);
2384 /*
2385 * tcp_close() should never return NULL here as the socket is
2386 * still open.
2387 */
2388 KASSERT(tp != NULL,
2389 ("tcp_usrclosed: tcp_close() returned NULL"));
2390 break;
2391
2392 case TCPS_SYN_SENT:
2393 case TCPS_SYN_RECEIVED:
2394 tp->t_flags |= TF_NEEDFIN;
2395 break;
2396
2397 case TCPS_ESTABLISHED:
2398 tcp_state_change(tp, TCPS_FIN_WAIT_1);
2399 break;
2400
2401 case TCPS_CLOSE_WAIT:
2402 tcp_state_change(tp, TCPS_LAST_ACK);
2403 break;
2404 }
2405 if (tp->t_state >= TCPS_FIN_WAIT_2) {
2406 soisdisconnected(tp->t_inpcb->inp_socket);
2407 /* Prevent the connection hanging in FIN_WAIT_2 forever. */
2408 if (tp->t_state == TCPS_FIN_WAIT_2) {
2409 int timeout;
2410
2411 timeout = (tcp_fast_finwait2_recycle) ?
2412 tcp_finwait2_timeout : TP_MAXIDLE(tp);
2413 tcp_timer_activate(tp, TT_2MSL, timeout);
2414 }
2415 }
2416 }
2417
2418 #ifdef DDB
2419 static void
db_print_indent(int indent)2420 db_print_indent(int indent)
2421 {
2422 int i;
2423
2424 for (i = 0; i < indent; i++)
2425 db_printf(" ");
2426 }
2427
2428 static void
db_print_tstate(int t_state)2429 db_print_tstate(int t_state)
2430 {
2431
2432 switch (t_state) {
2433 case TCPS_CLOSED:
2434 db_printf("TCPS_CLOSED");
2435 return;
2436
2437 case TCPS_LISTEN:
2438 db_printf("TCPS_LISTEN");
2439 return;
2440
2441 case TCPS_SYN_SENT:
2442 db_printf("TCPS_SYN_SENT");
2443 return;
2444
2445 case TCPS_SYN_RECEIVED:
2446 db_printf("TCPS_SYN_RECEIVED");
2447 return;
2448
2449 case TCPS_ESTABLISHED:
2450 db_printf("TCPS_ESTABLISHED");
2451 return;
2452
2453 case TCPS_CLOSE_WAIT:
2454 db_printf("TCPS_CLOSE_WAIT");
2455 return;
2456
2457 case TCPS_FIN_WAIT_1:
2458 db_printf("TCPS_FIN_WAIT_1");
2459 return;
2460
2461 case TCPS_CLOSING:
2462 db_printf("TCPS_CLOSING");
2463 return;
2464
2465 case TCPS_LAST_ACK:
2466 db_printf("TCPS_LAST_ACK");
2467 return;
2468
2469 case TCPS_FIN_WAIT_2:
2470 db_printf("TCPS_FIN_WAIT_2");
2471 return;
2472
2473 case TCPS_TIME_WAIT:
2474 db_printf("TCPS_TIME_WAIT");
2475 return;
2476
2477 default:
2478 db_printf("unknown");
2479 return;
2480 }
2481 }
2482
2483 static void
db_print_tflags(u_int t_flags)2484 db_print_tflags(u_int t_flags)
2485 {
2486 int comma;
2487
2488 comma = 0;
2489 if (t_flags & TF_ACKNOW) {
2490 db_printf("%sTF_ACKNOW", comma ? ", " : "");
2491 comma = 1;
2492 }
2493 if (t_flags & TF_DELACK) {
2494 db_printf("%sTF_DELACK", comma ? ", " : "");
2495 comma = 1;
2496 }
2497 if (t_flags & TF_NODELAY) {
2498 db_printf("%sTF_NODELAY", comma ? ", " : "");
2499 comma = 1;
2500 }
2501 if (t_flags & TF_NOOPT) {
2502 db_printf("%sTF_NOOPT", comma ? ", " : "");
2503 comma = 1;
2504 }
2505 if (t_flags & TF_SENTFIN) {
2506 db_printf("%sTF_SENTFIN", comma ? ", " : "");
2507 comma = 1;
2508 }
2509 if (t_flags & TF_REQ_SCALE) {
2510 db_printf("%sTF_REQ_SCALE", comma ? ", " : "");
2511 comma = 1;
2512 }
2513 if (t_flags & TF_RCVD_SCALE) {
2514 db_printf("%sTF_RECVD_SCALE", comma ? ", " : "");
2515 comma = 1;
2516 }
2517 if (t_flags & TF_REQ_TSTMP) {
2518 db_printf("%sTF_REQ_TSTMP", comma ? ", " : "");
2519 comma = 1;
2520 }
2521 if (t_flags & TF_RCVD_TSTMP) {
2522 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : "");
2523 comma = 1;
2524 }
2525 if (t_flags & TF_SACK_PERMIT) {
2526 db_printf("%sTF_SACK_PERMIT", comma ? ", " : "");
2527 comma = 1;
2528 }
2529 if (t_flags & TF_NEEDSYN) {
2530 db_printf("%sTF_NEEDSYN", comma ? ", " : "");
2531 comma = 1;
2532 }
2533 if (t_flags & TF_NEEDFIN) {
2534 db_printf("%sTF_NEEDFIN", comma ? ", " : "");
2535 comma = 1;
2536 }
2537 if (t_flags & TF_NOPUSH) {
2538 db_printf("%sTF_NOPUSH", comma ? ", " : "");
2539 comma = 1;
2540 }
2541 if (t_flags & TF_MORETOCOME) {
2542 db_printf("%sTF_MORETOCOME", comma ? ", " : "");
2543 comma = 1;
2544 }
2545 if (t_flags & TF_LQ_OVERFLOW) {
2546 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : "");
2547 comma = 1;
2548 }
2549 if (t_flags & TF_LASTIDLE) {
2550 db_printf("%sTF_LASTIDLE", comma ? ", " : "");
2551 comma = 1;
2552 }
2553 if (t_flags & TF_RXWIN0SENT) {
2554 db_printf("%sTF_RXWIN0SENT", comma ? ", " : "");
2555 comma = 1;
2556 }
2557 if (t_flags & TF_FASTRECOVERY) {
2558 db_printf("%sTF_FASTRECOVERY", comma ? ", " : "");
2559 comma = 1;
2560 }
2561 if (t_flags & TF_CONGRECOVERY) {
2562 db_printf("%sTF_CONGRECOVERY", comma ? ", " : "");
2563 comma = 1;
2564 }
2565 if (t_flags & TF_WASFRECOVERY) {
2566 db_printf("%sTF_WASFRECOVERY", comma ? ", " : "");
2567 comma = 1;
2568 }
2569 if (t_flags & TF_SIGNATURE) {
2570 db_printf("%sTF_SIGNATURE", comma ? ", " : "");
2571 comma = 1;
2572 }
2573 if (t_flags & TF_FORCEDATA) {
2574 db_printf("%sTF_FORCEDATA", comma ? ", " : "");
2575 comma = 1;
2576 }
2577 if (t_flags & TF_TSO) {
2578 db_printf("%sTF_TSO", comma ? ", " : "");
2579 comma = 1;
2580 }
2581 if (t_flags & TF_ECN_PERMIT) {
2582 db_printf("%sTF_ECN_PERMIT", comma ? ", " : "");
2583 comma = 1;
2584 }
2585 if (t_flags & TF_FASTOPEN) {
2586 db_printf("%sTF_FASTOPEN", comma ? ", " : "");
2587 comma = 1;
2588 }
2589 }
2590
2591 static void
db_print_toobflags(char t_oobflags)2592 db_print_toobflags(char t_oobflags)
2593 {
2594 int comma;
2595
2596 comma = 0;
2597 if (t_oobflags & TCPOOB_HAVEDATA) {
2598 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : "");
2599 comma = 1;
2600 }
2601 if (t_oobflags & TCPOOB_HADDATA) {
2602 db_printf("%sTCPOOB_HADDATA", comma ? ", " : "");
2603 comma = 1;
2604 }
2605 }
2606
2607 static void
db_print_tcpcb(struct tcpcb * tp,const char * name,int indent)2608 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent)
2609 {
2610
2611 db_print_indent(indent);
2612 db_printf("%s at %p\n", name, tp);
2613
2614 indent += 2;
2615
2616 db_print_indent(indent);
2617 db_printf("t_segq first: %p t_segqlen: %d t_dupacks: %d\n",
2618 TAILQ_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks);
2619
2620 db_print_indent(indent);
2621 db_printf("tt_rexmt: %p tt_persist: %p tt_keep: %p\n",
2622 &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep);
2623
2624 db_print_indent(indent);
2625 db_printf("tt_2msl: %p tt_delack: %p t_inpcb: %p\n", &tp->t_timers->tt_2msl,
2626 &tp->t_timers->tt_delack, tp->t_inpcb);
2627
2628 db_print_indent(indent);
2629 db_printf("t_state: %d (", tp->t_state);
2630 db_print_tstate(tp->t_state);
2631 db_printf(")\n");
2632
2633 db_print_indent(indent);
2634 db_printf("t_flags: 0x%x (", tp->t_flags);
2635 db_print_tflags(tp->t_flags);
2636 db_printf(")\n");
2637
2638 db_print_indent(indent);
2639 db_printf("snd_una: 0x%08x snd_max: 0x%08x snd_nxt: x0%08x\n",
2640 tp->snd_una, tp->snd_max, tp->snd_nxt);
2641
2642 db_print_indent(indent);
2643 db_printf("snd_up: 0x%08x snd_wl1: 0x%08x snd_wl2: 0x%08x\n",
2644 tp->snd_up, tp->snd_wl1, tp->snd_wl2);
2645
2646 db_print_indent(indent);
2647 db_printf("iss: 0x%08x irs: 0x%08x rcv_nxt: 0x%08x\n",
2648 tp->iss, tp->irs, tp->rcv_nxt);
2649
2650 db_print_indent(indent);
2651 db_printf("rcv_adv: 0x%08x rcv_wnd: %u rcv_up: 0x%08x\n",
2652 tp->rcv_adv, tp->rcv_wnd, tp->rcv_up);
2653
2654 db_print_indent(indent);
2655 db_printf("snd_wnd: %u snd_cwnd: %u\n",
2656 tp->snd_wnd, tp->snd_cwnd);
2657
2658 db_print_indent(indent);
2659 db_printf("snd_ssthresh: %u snd_recover: "
2660 "0x%08x\n", tp->snd_ssthresh, tp->snd_recover);
2661
2662 db_print_indent(indent);
2663 db_printf("t_rcvtime: %u t_startime: %u\n",
2664 tp->t_rcvtime, tp->t_starttime);
2665
2666 db_print_indent(indent);
2667 db_printf("t_rttime: %u t_rtsq: 0x%08x\n",
2668 tp->t_rtttime, tp->t_rtseq);
2669
2670 db_print_indent(indent);
2671 db_printf("t_rxtcur: %d t_maxseg: %u t_srtt: %d\n",
2672 tp->t_rxtcur, tp->t_maxseg, tp->t_srtt);
2673
2674 db_print_indent(indent);
2675 db_printf("t_rttvar: %d t_rxtshift: %d t_rttmin: %u "
2676 "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin,
2677 tp->t_rttbest);
2678
2679 db_print_indent(indent);
2680 db_printf("t_rttupdated: %lu max_sndwnd: %u t_softerror: %d\n",
2681 tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror);
2682
2683 db_print_indent(indent);
2684 db_printf("t_oobflags: 0x%x (", tp->t_oobflags);
2685 db_print_toobflags(tp->t_oobflags);
2686 db_printf(") t_iobc: 0x%02x\n", tp->t_iobc);
2687
2688 db_print_indent(indent);
2689 db_printf("snd_scale: %u rcv_scale: %u request_r_scale: %u\n",
2690 tp->snd_scale, tp->rcv_scale, tp->request_r_scale);
2691
2692 db_print_indent(indent);
2693 db_printf("ts_recent: %u ts_recent_age: %u\n",
2694 tp->ts_recent, tp->ts_recent_age);
2695
2696 db_print_indent(indent);
2697 db_printf("ts_offset: %u last_ack_sent: 0x%08x snd_cwnd_prev: "
2698 "%u\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev);
2699
2700 db_print_indent(indent);
2701 db_printf("snd_ssthresh_prev: %u snd_recover_prev: 0x%08x "
2702 "t_badrxtwin: %u\n", tp->snd_ssthresh_prev,
2703 tp->snd_recover_prev, tp->t_badrxtwin);
2704
2705 db_print_indent(indent);
2706 db_printf("snd_numholes: %d snd_holes first: %p\n",
2707 tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes));
2708
2709 db_print_indent(indent);
2710 db_printf("snd_fack: 0x%08x rcv_numsacks: %d sack_newdata: "
2711 "0x%08x\n", tp->snd_fack, tp->rcv_numsacks, tp->sack_newdata);
2712
2713 /* Skip sackblks, sackhint. */
2714
2715 db_print_indent(indent);
2716 db_printf("t_rttlow: %d rfbuf_ts: %u rfbuf_cnt: %d\n",
2717 tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt);
2718 }
2719
DB_SHOW_COMMAND(tcpcb,db_show_tcpcb)2720 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb)
2721 {
2722 struct tcpcb *tp;
2723
2724 if (!have_addr) {
2725 db_printf("usage: show tcpcb <addr>\n");
2726 return;
2727 }
2728 tp = (struct tcpcb *)addr;
2729
2730 db_print_tcpcb(tp, "tcpcb", 0);
2731 }
2732 #endif
2733