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_kern_tls.h"
48 #include "opt_tcpdebug.h"
49
50 #include <sys/param.h>
51 #include <sys/systm.h>
52 #include <sys/arb.h>
53 #include <sys/limits.h>
54 #include <sys/malloc.h>
55 #include <sys/refcount.h>
56 #include <sys/kernel.h>
57 #include <sys/ktls.h>
58 #include <sys/qmath.h>
59 #include <sys/sysctl.h>
60 #include <sys/mbuf.h>
61 #ifdef INET6
62 #include <sys/domain.h>
63 #endif /* INET6 */
64 #include <sys/socket.h>
65 #include <sys/socketvar.h>
66 #include <sys/protosw.h>
67 #include <sys/proc.h>
68 #include <sys/jail.h>
69 #include <sys/syslog.h>
70 #include <sys/stats.h>
71
72 #ifdef DDB
73 #include <ddb/ddb.h>
74 #endif
75
76 #include <net/if.h>
77 #include <net/if_var.h>
78 #include <net/route.h>
79 #include <net/vnet.h>
80
81 #include <netinet/in.h>
82 #include <netinet/in_kdtrace.h>
83 #include <netinet/in_pcb.h>
84 #include <netinet/in_systm.h>
85 #include <netinet/in_var.h>
86 #include <netinet/ip_var.h>
87 #ifdef INET6
88 #include <netinet/ip6.h>
89 #include <netinet6/in6_pcb.h>
90 #include <netinet6/ip6_var.h>
91 #include <netinet6/scope6_var.h>
92 #endif
93 #include <netinet/tcp.h>
94 #include <netinet/tcp_fsm.h>
95 #include <netinet/tcp_seq.h>
96 #include <netinet/tcp_timer.h>
97 #include <netinet/tcp_var.h>
98 #include <netinet/tcp_log_buf.h>
99 #include <netinet/tcpip.h>
100 #include <netinet/cc/cc.h>
101 #include <netinet/tcp_fastopen.h>
102 #include <netinet/tcp_hpts.h>
103 #ifdef TCPPCAP
104 #include <netinet/tcp_pcap.h>
105 #endif
106 #ifdef TCPDEBUG
107 #include <netinet/tcp_debug.h>
108 #endif
109 #ifdef TCP_OFFLOAD
110 #include <netinet/tcp_offload.h>
111 #endif
112 #include <netipsec/ipsec_support.h>
113
114 #include <vm/vm.h>
115 #include <vm/vm_param.h>
116 #include <vm/pmap.h>
117 #include <vm/vm_extern.h>
118 #include <vm/vm_map.h>
119 #include <vm/vm_page.h>
120
121 /*
122 * TCP protocol interface to socket abstraction.
123 */
124 #ifdef INET
125 static int tcp_connect(struct tcpcb *, struct sockaddr *,
126 struct thread *td);
127 #endif /* INET */
128 #ifdef INET6
129 static int tcp6_connect(struct tcpcb *, struct sockaddr *,
130 struct thread *td);
131 #endif /* INET6 */
132 static void tcp_disconnect(struct tcpcb *);
133 static void tcp_usrclosed(struct tcpcb *);
134 static void tcp_fill_info(struct tcpcb *, struct tcp_info *);
135
136 static int tcp_pru_options_support(struct tcpcb *tp, int flags);
137
138 #ifdef TCPDEBUG
139 #define TCPDEBUG0 int ostate = 0
140 #define TCPDEBUG1() ostate = tp ? tp->t_state : 0
141 #define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \
142 tcp_trace(TA_USER, ostate, tp, 0, 0, req)
143 #else
144 #define TCPDEBUG0
145 #define TCPDEBUG1()
146 #define TCPDEBUG2(req)
147 #endif
148
149 /*
150 * tcp_require_unique port requires a globally-unique source port for each
151 * outgoing connection. The default is to require the 4-tuple to be unique.
152 */
153 VNET_DEFINE(int, tcp_require_unique_port) = 0;
154 SYSCTL_INT(_net_inet_tcp, OID_AUTO, require_unique_port,
155 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(tcp_require_unique_port), 0,
156 "Require globally-unique ephemeral port for outgoing connections");
157 #define V_tcp_require_unique_port VNET(tcp_require_unique_port)
158
159 /*
160 * TCP attaches to socket via pru_attach(), reserving space,
161 * and an internet control block.
162 */
163 static int
tcp_usr_attach(struct socket * so,int proto,struct thread * td)164 tcp_usr_attach(struct socket *so, int proto, struct thread *td)
165 {
166 struct inpcb *inp;
167 struct tcpcb *tp = NULL;
168 int error;
169 TCPDEBUG0;
170
171 inp = sotoinpcb(so);
172 KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL"));
173 TCPDEBUG1();
174
175 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
176 error = soreserve(so, V_tcp_sendspace, V_tcp_recvspace);
177 if (error)
178 goto out;
179 }
180
181 so->so_rcv.sb_flags |= SB_AUTOSIZE;
182 so->so_snd.sb_flags |= SB_AUTOSIZE;
183 error = in_pcballoc(so, &V_tcbinfo);
184 if (error)
185 goto out;
186 inp = sotoinpcb(so);
187 #ifdef INET6
188 if (inp->inp_vflag & INP_IPV6PROTO) {
189 inp->inp_vflag |= INP_IPV6;
190 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
191 inp->inp_vflag |= INP_IPV4;
192 inp->in6p_hops = -1; /* use kernel default */
193 }
194 else
195 #endif
196 inp->inp_vflag |= INP_IPV4;
197 tp = tcp_newtcpcb(inp);
198 if (tp == NULL) {
199 error = ENOBUFS;
200 in_pcbdetach(inp);
201 in_pcbfree(inp);
202 goto out;
203 }
204 tp->t_state = TCPS_CLOSED;
205 INP_WUNLOCK(inp);
206 TCPSTATES_INC(TCPS_CLOSED);
207 out:
208 TCPDEBUG2(PRU_ATTACH);
209 TCP_PROBE2(debug__user, tp, PRU_ATTACH);
210 return (error);
211 }
212
213 /*
214 * tcp_usr_detach is called when the socket layer loses its final reference
215 * to the socket, be it a file descriptor reference, a reference from TCP,
216 * etc. At this point, there is only one case in which we will keep around
217 * inpcb state: time wait.
218 */
219 static void
tcp_usr_detach(struct socket * so)220 tcp_usr_detach(struct socket *so)
221 {
222 struct inpcb *inp;
223 struct tcpcb *tp;
224
225 inp = sotoinpcb(so);
226 KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
227 INP_WLOCK(inp);
228 KASSERT(so->so_pcb == inp && inp->inp_socket == so,
229 ("%s: socket %p inp %p mismatch", __func__, so, inp));
230
231 tp = intotcpcb(inp);
232
233 if (inp->inp_flags & INP_TIMEWAIT) {
234 /*
235 * There are two cases to handle: one in which the time wait
236 * state is being discarded (INP_DROPPED), and one in which
237 * this connection will remain in timewait. In the former,
238 * it is time to discard all state (except tcptw, which has
239 * already been discarded by the timewait close code, which
240 * should be further up the call stack somewhere). In the
241 * latter case, we detach from the socket, but leave the pcb
242 * present until timewait ends.
243 *
244 * XXXRW: Would it be cleaner to free the tcptw here?
245 *
246 * Astute question indeed, from twtcp perspective there are
247 * four cases to consider:
248 *
249 * #1 tcp_usr_detach is called at tcptw creation time by
250 * tcp_twstart, then do not discard the newly created tcptw
251 * and leave inpcb present until timewait ends
252 * #2 tcp_usr_detach is called at tcptw creation time by
253 * tcp_twstart, but connection is local and tw will be
254 * discarded immediately
255 * #3 tcp_usr_detach is called at timewait end (or reuse) by
256 * tcp_twclose, then the tcptw has already been discarded
257 * (or reused) and inpcb is freed here
258 * #4 tcp_usr_detach is called() after timewait ends (or reuse)
259 * (e.g. by soclose), then tcptw has already been discarded
260 * (or reused) and inpcb is freed here
261 *
262 * In all three cases the tcptw should not be freed here.
263 */
264 if (inp->inp_flags & INP_DROPPED) {
265 in_pcbdetach(inp);
266 if (__predict_true(tp == NULL)) {
267 in_pcbfree(inp);
268 } else {
269 /*
270 * This case should not happen as in TIMEWAIT
271 * state the inp should not be destroyed before
272 * its tcptw. If INVARIANTS is defined, panic.
273 */
274 #ifdef INVARIANTS
275 panic("%s: Panic before an inp double-free: "
276 "INP_TIMEWAIT && INP_DROPPED && tp != NULL"
277 , __func__);
278 #else
279 log(LOG_ERR, "%s: Avoid an inp double-free: "
280 "INP_TIMEWAIT && INP_DROPPED && tp != NULL"
281 , __func__);
282 #endif
283 INP_WUNLOCK(inp);
284 }
285 } else {
286 in_pcbdetach(inp);
287 INP_WUNLOCK(inp);
288 }
289 } else {
290 /*
291 * If the connection is not in timewait, we consider two
292 * two conditions: one in which no further processing is
293 * necessary (dropped || embryonic), and one in which TCP is
294 * not yet done, but no longer requires the socket, so the
295 * pcb will persist for the time being.
296 *
297 * XXXRW: Does the second case still occur?
298 */
299 if (inp->inp_flags & INP_DROPPED ||
300 tp->t_state < TCPS_SYN_SENT) {
301 tcp_discardcb(tp);
302 in_pcbdetach(inp);
303 in_pcbfree(inp);
304 } else {
305 in_pcbdetach(inp);
306 INP_WUNLOCK(inp);
307 }
308 }
309 }
310
311 #ifdef INET
312 /*
313 * Give the socket an address.
314 */
315 static int
tcp_usr_bind(struct socket * so,struct sockaddr * nam,struct thread * td)316 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
317 {
318 int error = 0;
319 struct inpcb *inp;
320 struct tcpcb *tp = NULL;
321 struct sockaddr_in *sinp;
322
323 sinp = (struct sockaddr_in *)nam;
324 if (nam->sa_family != AF_INET) {
325 /*
326 * Preserve compatibility with old programs.
327 */
328 if (nam->sa_family != AF_UNSPEC ||
329 nam->sa_len < offsetof(struct sockaddr_in, sin_zero) ||
330 sinp->sin_addr.s_addr != INADDR_ANY)
331 return (EAFNOSUPPORT);
332 nam->sa_family = AF_INET;
333 }
334 if (nam->sa_len != sizeof(*sinp))
335 return (EINVAL);
336
337 /*
338 * Must check for multicast addresses and disallow binding
339 * to them.
340 */
341 if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
342 return (EAFNOSUPPORT);
343
344 TCPDEBUG0;
345 inp = sotoinpcb(so);
346 KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL"));
347 INP_WLOCK(inp);
348 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
349 error = EINVAL;
350 goto out;
351 }
352 tp = intotcpcb(inp);
353 TCPDEBUG1();
354 INP_HASH_WLOCK(&V_tcbinfo);
355 error = in_pcbbind(inp, nam, td->td_ucred);
356 INP_HASH_WUNLOCK(&V_tcbinfo);
357 out:
358 TCPDEBUG2(PRU_BIND);
359 TCP_PROBE2(debug__user, tp, PRU_BIND);
360 INP_WUNLOCK(inp);
361
362 return (error);
363 }
364 #endif /* INET */
365
366 #ifdef INET6
367 static int
tcp6_usr_bind(struct socket * so,struct sockaddr * nam,struct thread * td)368 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
369 {
370 int error = 0;
371 struct inpcb *inp;
372 struct tcpcb *tp = NULL;
373 struct sockaddr_in6 *sin6;
374 u_char vflagsav;
375
376 sin6 = (struct sockaddr_in6 *)nam;
377 if (nam->sa_family != AF_INET6)
378 return (EAFNOSUPPORT);
379 if (nam->sa_len != sizeof(*sin6))
380 return (EINVAL);
381
382 /*
383 * Must check for multicast addresses and disallow binding
384 * to them.
385 */
386 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
387 return (EAFNOSUPPORT);
388
389 TCPDEBUG0;
390 inp = sotoinpcb(so);
391 KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL"));
392 INP_WLOCK(inp);
393 vflagsav = inp->inp_vflag;
394 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
395 error = EINVAL;
396 goto out;
397 }
398 tp = intotcpcb(inp);
399 TCPDEBUG1();
400 INP_HASH_WLOCK(&V_tcbinfo);
401 inp->inp_vflag &= ~INP_IPV4;
402 inp->inp_vflag |= INP_IPV6;
403 #ifdef INET
404 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
405 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
406 inp->inp_vflag |= INP_IPV4;
407 else if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
408 struct sockaddr_in sin;
409
410 in6_sin6_2_sin(&sin, sin6);
411 if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
412 error = EAFNOSUPPORT;
413 INP_HASH_WUNLOCK(&V_tcbinfo);
414 goto out;
415 }
416 inp->inp_vflag |= INP_IPV4;
417 inp->inp_vflag &= ~INP_IPV6;
418 error = in_pcbbind(inp, (struct sockaddr *)&sin,
419 td->td_ucred);
420 INP_HASH_WUNLOCK(&V_tcbinfo);
421 goto out;
422 }
423 }
424 #endif
425 error = in6_pcbbind(inp, nam, td->td_ucred);
426 INP_HASH_WUNLOCK(&V_tcbinfo);
427 out:
428 if (error != 0)
429 inp->inp_vflag = vflagsav;
430 TCPDEBUG2(PRU_BIND);
431 TCP_PROBE2(debug__user, tp, PRU_BIND);
432 INP_WUNLOCK(inp);
433 return (error);
434 }
435 #endif /* INET6 */
436
437 #ifdef INET
438 /*
439 * Prepare to accept connections.
440 */
441 static int
tcp_usr_listen(struct socket * so,int backlog,struct thread * td)442 tcp_usr_listen(struct socket *so, int backlog, struct thread *td)
443 {
444 int error = 0;
445 struct inpcb *inp;
446 struct tcpcb *tp = NULL;
447
448 TCPDEBUG0;
449 inp = sotoinpcb(so);
450 KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL"));
451 INP_WLOCK(inp);
452 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
453 error = EINVAL;
454 goto out;
455 }
456 tp = intotcpcb(inp);
457 TCPDEBUG1();
458 SOCK_LOCK(so);
459 error = solisten_proto_check(so);
460 INP_HASH_WLOCK(&V_tcbinfo);
461 if (error == 0 && inp->inp_lport == 0)
462 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
463 INP_HASH_WUNLOCK(&V_tcbinfo);
464 if (error == 0) {
465 tcp_state_change(tp, TCPS_LISTEN);
466 solisten_proto(so, backlog);
467 #ifdef TCP_OFFLOAD
468 if ((so->so_options & SO_NO_OFFLOAD) == 0)
469 tcp_offload_listen_start(tp);
470 #endif
471 }
472 SOCK_UNLOCK(so);
473
474 if (IS_FASTOPEN(tp->t_flags))
475 tp->t_tfo_pending = tcp_fastopen_alloc_counter();
476
477 out:
478 TCPDEBUG2(PRU_LISTEN);
479 TCP_PROBE2(debug__user, tp, PRU_LISTEN);
480 INP_WUNLOCK(inp);
481 return (error);
482 }
483 #endif /* INET */
484
485 #ifdef INET6
486 static int
tcp6_usr_listen(struct socket * so,int backlog,struct thread * td)487 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td)
488 {
489 int error = 0;
490 struct inpcb *inp;
491 struct tcpcb *tp = NULL;
492 u_char vflagsav;
493
494 TCPDEBUG0;
495 inp = sotoinpcb(so);
496 KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL"));
497 INP_WLOCK(inp);
498 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
499 error = EINVAL;
500 goto out;
501 }
502 vflagsav = inp->inp_vflag;
503 tp = intotcpcb(inp);
504 TCPDEBUG1();
505 SOCK_LOCK(so);
506 error = solisten_proto_check(so);
507 INP_HASH_WLOCK(&V_tcbinfo);
508 if (error == 0 && inp->inp_lport == 0) {
509 inp->inp_vflag &= ~INP_IPV4;
510 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
511 inp->inp_vflag |= INP_IPV4;
512 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
513 }
514 INP_HASH_WUNLOCK(&V_tcbinfo);
515 if (error == 0) {
516 tcp_state_change(tp, TCPS_LISTEN);
517 solisten_proto(so, backlog);
518 #ifdef TCP_OFFLOAD
519 if ((so->so_options & SO_NO_OFFLOAD) == 0)
520 tcp_offload_listen_start(tp);
521 #endif
522 }
523 SOCK_UNLOCK(so);
524
525 if (IS_FASTOPEN(tp->t_flags))
526 tp->t_tfo_pending = tcp_fastopen_alloc_counter();
527
528 if (error != 0)
529 inp->inp_vflag = vflagsav;
530
531 out:
532 TCPDEBUG2(PRU_LISTEN);
533 TCP_PROBE2(debug__user, tp, PRU_LISTEN);
534 INP_WUNLOCK(inp);
535 return (error);
536 }
537 #endif /* INET6 */
538
539 #ifdef INET
540 /*
541 * Initiate connection to peer.
542 * Create a template for use in transmissions on this connection.
543 * Enter SYN_SENT state, and mark socket as connecting.
544 * Start keep-alive timer, and seed output sequence space.
545 * Send initial segment on connection.
546 */
547 static int
tcp_usr_connect(struct socket * so,struct sockaddr * nam,struct thread * td)548 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
549 {
550 struct epoch_tracker et;
551 int error = 0;
552 struct inpcb *inp;
553 struct tcpcb *tp = NULL;
554 struct sockaddr_in *sinp;
555
556 sinp = (struct sockaddr_in *)nam;
557 if (nam->sa_family != AF_INET)
558 return (EAFNOSUPPORT);
559 if (nam->sa_len != sizeof (*sinp))
560 return (EINVAL);
561
562 /*
563 * Must disallow TCP ``connections'' to multicast addresses.
564 */
565 if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
566 return (EAFNOSUPPORT);
567 if (ntohl(sinp->sin_addr.s_addr) == INADDR_BROADCAST)
568 return (EACCES);
569 if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0)
570 return (error);
571
572 TCPDEBUG0;
573 inp = sotoinpcb(so);
574 KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL"));
575 INP_WLOCK(inp);
576 if (inp->inp_flags & INP_TIMEWAIT) {
577 error = EADDRINUSE;
578 goto out;
579 }
580 if (inp->inp_flags & INP_DROPPED) {
581 error = ECONNREFUSED;
582 goto out;
583 }
584 tp = intotcpcb(inp);
585 TCPDEBUG1();
586 NET_EPOCH_ENTER(et);
587 if ((error = tcp_connect(tp, nam, td)) != 0)
588 goto out_in_epoch;
589 #ifdef TCP_OFFLOAD
590 if (registered_toedevs > 0 &&
591 (so->so_options & SO_NO_OFFLOAD) == 0 &&
592 (error = tcp_offload_connect(so, nam)) == 0)
593 goto out_in_epoch;
594 #endif
595 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp));
596 error = tp->t_fb->tfb_tcp_output(tp);
597 out_in_epoch:
598 NET_EPOCH_EXIT(et);
599 out:
600 TCPDEBUG2(PRU_CONNECT);
601 TCP_PROBE2(debug__user, tp, PRU_CONNECT);
602 INP_WUNLOCK(inp);
603 return (error);
604 }
605 #endif /* INET */
606
607 #ifdef INET6
608 static int
tcp6_usr_connect(struct socket * so,struct sockaddr * nam,struct thread * td)609 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
610 {
611 struct epoch_tracker et;
612 int error = 0;
613 struct inpcb *inp;
614 struct tcpcb *tp = NULL;
615 struct sockaddr_in6 *sin6;
616 u_int8_t incflagsav;
617 u_char vflagsav;
618
619 TCPDEBUG0;
620
621 sin6 = (struct sockaddr_in6 *)nam;
622 if (nam->sa_family != AF_INET6)
623 return (EAFNOSUPPORT);
624 if (nam->sa_len != sizeof (*sin6))
625 return (EINVAL);
626
627 /*
628 * Must disallow TCP ``connections'' to multicast addresses.
629 */
630 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
631 return (EAFNOSUPPORT);
632
633 inp = sotoinpcb(so);
634 KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL"));
635 INP_WLOCK(inp);
636 vflagsav = inp->inp_vflag;
637 incflagsav = inp->inp_inc.inc_flags;
638 if (inp->inp_flags & INP_TIMEWAIT) {
639 error = EADDRINUSE;
640 goto out;
641 }
642 if (inp->inp_flags & INP_DROPPED) {
643 error = ECONNREFUSED;
644 goto out;
645 }
646 tp = intotcpcb(inp);
647 TCPDEBUG1();
648 #ifdef INET
649 /*
650 * XXXRW: Some confusion: V4/V6 flags relate to binding, and
651 * therefore probably require the hash lock, which isn't held here.
652 * Is this a significant problem?
653 */
654 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
655 struct sockaddr_in sin;
656
657 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
658 error = EINVAL;
659 goto out;
660 }
661 if ((inp->inp_vflag & INP_IPV4) == 0) {
662 error = EAFNOSUPPORT;
663 goto out;
664 }
665
666 in6_sin6_2_sin(&sin, sin6);
667 if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
668 error = EAFNOSUPPORT;
669 goto out;
670 }
671 if (ntohl(sin.sin_addr.s_addr) == INADDR_BROADCAST) {
672 error = EACCES;
673 goto out;
674 }
675 if ((error = prison_remote_ip4(td->td_ucred,
676 &sin.sin_addr)) != 0)
677 goto out;
678 inp->inp_vflag |= INP_IPV4;
679 inp->inp_vflag &= ~INP_IPV6;
680 NET_EPOCH_ENTER(et);
681 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0)
682 goto out_in_epoch;
683 #ifdef TCP_OFFLOAD
684 if (registered_toedevs > 0 &&
685 (so->so_options & SO_NO_OFFLOAD) == 0 &&
686 (error = tcp_offload_connect(so, nam)) == 0)
687 goto out_in_epoch;
688 #endif
689 error = tp->t_fb->tfb_tcp_output(tp);
690 goto out_in_epoch;
691 } else {
692 if ((inp->inp_vflag & INP_IPV6) == 0) {
693 error = EAFNOSUPPORT;
694 goto out;
695 }
696 }
697 #endif
698 if ((error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr)) != 0)
699 goto out;
700 inp->inp_vflag &= ~INP_IPV4;
701 inp->inp_vflag |= INP_IPV6;
702 inp->inp_inc.inc_flags |= INC_ISIPV6;
703 if ((error = tcp6_connect(tp, nam, td)) != 0)
704 goto out;
705 #ifdef TCP_OFFLOAD
706 if (registered_toedevs > 0 &&
707 (so->so_options & SO_NO_OFFLOAD) == 0 &&
708 (error = tcp_offload_connect(so, nam)) == 0)
709 goto out;
710 #endif
711 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp));
712 NET_EPOCH_ENTER(et);
713 error = tp->t_fb->tfb_tcp_output(tp);
714 #ifdef INET
715 out_in_epoch:
716 #endif
717 NET_EPOCH_EXIT(et);
718 out:
719 /*
720 * If the implicit bind in the connect call fails, restore
721 * the flags we modified.
722 */
723 if (error != 0 && inp->inp_lport == 0) {
724 inp->inp_vflag = vflagsav;
725 inp->inp_inc.inc_flags = incflagsav;
726 }
727
728 TCPDEBUG2(PRU_CONNECT);
729 TCP_PROBE2(debug__user, tp, PRU_CONNECT);
730 INP_WUNLOCK(inp);
731 return (error);
732 }
733 #endif /* INET6 */
734
735 /*
736 * Initiate disconnect from peer.
737 * If connection never passed embryonic stage, just drop;
738 * else if don't need to let data drain, then can just drop anyways,
739 * else have to begin TCP shutdown process: mark socket disconnecting,
740 * drain unread data, state switch to reflect user close, and
741 * send segment (e.g. FIN) to peer. Socket will be really disconnected
742 * when peer sends FIN and acks ours.
743 *
744 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
745 */
746 static int
tcp_usr_disconnect(struct socket * so)747 tcp_usr_disconnect(struct socket *so)
748 {
749 struct inpcb *inp;
750 struct tcpcb *tp = NULL;
751 struct epoch_tracker et;
752 int error = 0;
753
754 TCPDEBUG0;
755 NET_EPOCH_ENTER(et);
756 inp = sotoinpcb(so);
757 KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL"));
758 INP_WLOCK(inp);
759 if (inp->inp_flags & INP_TIMEWAIT)
760 goto out;
761 if (inp->inp_flags & INP_DROPPED) {
762 error = ECONNRESET;
763 goto out;
764 }
765 tp = intotcpcb(inp);
766 TCPDEBUG1();
767 tcp_disconnect(tp);
768 out:
769 TCPDEBUG2(PRU_DISCONNECT);
770 TCP_PROBE2(debug__user, tp, PRU_DISCONNECT);
771 INP_WUNLOCK(inp);
772 NET_EPOCH_EXIT(et);
773 return (error);
774 }
775
776 #ifdef INET
777 /*
778 * Accept a connection. Essentially all the work is done at higher levels;
779 * just return the address of the peer, storing through addr.
780 */
781 static int
tcp_usr_accept(struct socket * so,struct sockaddr ** nam)782 tcp_usr_accept(struct socket *so, struct sockaddr **nam)
783 {
784 int error = 0;
785 struct inpcb *inp = NULL;
786 struct tcpcb *tp = NULL;
787 struct in_addr addr;
788 in_port_t port = 0;
789 TCPDEBUG0;
790
791 if (so->so_state & SS_ISDISCONNECTED)
792 return (ECONNABORTED);
793
794 inp = sotoinpcb(so);
795 KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL"));
796 INP_WLOCK(inp);
797 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
798 error = ECONNABORTED;
799 goto out;
800 }
801 tp = intotcpcb(inp);
802 TCPDEBUG1();
803
804 /*
805 * We inline in_getpeeraddr and COMMON_END here, so that we can
806 * copy the data of interest and defer the malloc until after we
807 * release the lock.
808 */
809 port = inp->inp_fport;
810 addr = inp->inp_faddr;
811
812 out:
813 TCPDEBUG2(PRU_ACCEPT);
814 TCP_PROBE2(debug__user, tp, PRU_ACCEPT);
815 INP_WUNLOCK(inp);
816 if (error == 0)
817 *nam = in_sockaddr(port, &addr);
818 return error;
819 }
820 #endif /* INET */
821
822 #ifdef INET6
823 static int
tcp6_usr_accept(struct socket * so,struct sockaddr ** nam)824 tcp6_usr_accept(struct socket *so, struct sockaddr **nam)
825 {
826 struct inpcb *inp = NULL;
827 int error = 0;
828 struct tcpcb *tp = NULL;
829 struct in_addr addr;
830 struct in6_addr addr6;
831 struct epoch_tracker et;
832 in_port_t port = 0;
833 int v4 = 0;
834 TCPDEBUG0;
835
836 if (so->so_state & SS_ISDISCONNECTED)
837 return (ECONNABORTED);
838
839 inp = sotoinpcb(so);
840 KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL"));
841 NET_EPOCH_ENTER(et);
842 INP_WLOCK(inp);
843 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
844 error = ECONNABORTED;
845 goto out;
846 }
847 tp = intotcpcb(inp);
848 TCPDEBUG1();
849
850 /*
851 * We inline in6_mapped_peeraddr and COMMON_END here, so that we can
852 * copy the data of interest and defer the malloc until after we
853 * release the lock.
854 */
855 if (inp->inp_vflag & INP_IPV4) {
856 v4 = 1;
857 port = inp->inp_fport;
858 addr = inp->inp_faddr;
859 } else {
860 port = inp->inp_fport;
861 addr6 = inp->in6p_faddr;
862 }
863
864 out:
865 TCPDEBUG2(PRU_ACCEPT);
866 TCP_PROBE2(debug__user, tp, PRU_ACCEPT);
867 INP_WUNLOCK(inp);
868 NET_EPOCH_EXIT(et);
869 if (error == 0) {
870 if (v4)
871 *nam = in6_v4mapsin6_sockaddr(port, &addr);
872 else
873 *nam = in6_sockaddr(port, &addr6);
874 }
875 return error;
876 }
877 #endif /* INET6 */
878
879 /*
880 * Mark the connection as being incapable of further output.
881 */
882 static int
tcp_usr_shutdown(struct socket * so)883 tcp_usr_shutdown(struct socket *so)
884 {
885 int error = 0;
886 struct inpcb *inp;
887 struct tcpcb *tp = NULL;
888 struct epoch_tracker et;
889
890 TCPDEBUG0;
891 NET_EPOCH_ENTER(et);
892 inp = sotoinpcb(so);
893 KASSERT(inp != NULL, ("inp == NULL"));
894 INP_WLOCK(inp);
895 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
896 error = ECONNRESET;
897 goto out;
898 }
899 tp = intotcpcb(inp);
900 TCPDEBUG1();
901 socantsendmore(so);
902 tcp_usrclosed(tp);
903 if (!(inp->inp_flags & INP_DROPPED))
904 error = tp->t_fb->tfb_tcp_output(tp);
905
906 out:
907 TCPDEBUG2(PRU_SHUTDOWN);
908 TCP_PROBE2(debug__user, tp, PRU_SHUTDOWN);
909 INP_WUNLOCK(inp);
910 NET_EPOCH_EXIT(et);
911
912 return (error);
913 }
914
915 /*
916 * After a receive, possibly send window update to peer.
917 */
918 static int
tcp_usr_rcvd(struct socket * so,int flags)919 tcp_usr_rcvd(struct socket *so, int flags)
920 {
921 struct epoch_tracker et;
922 struct inpcb *inp;
923 struct tcpcb *tp = NULL;
924 int error = 0;
925
926 TCPDEBUG0;
927 inp = sotoinpcb(so);
928 KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL"));
929 INP_WLOCK(inp);
930 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
931 error = ECONNRESET;
932 goto out;
933 }
934 tp = intotcpcb(inp);
935 TCPDEBUG1();
936 /*
937 * For passively-created TFO connections, don't attempt a window
938 * update while still in SYN_RECEIVED as this may trigger an early
939 * SYN|ACK. It is preferable to have the SYN|ACK be sent along with
940 * application response data, or failing that, when the DELACK timer
941 * expires.
942 */
943 if (IS_FASTOPEN(tp->t_flags) &&
944 (tp->t_state == TCPS_SYN_RECEIVED))
945 goto out;
946 NET_EPOCH_ENTER(et);
947 #ifdef TCP_OFFLOAD
948 if (tp->t_flags & TF_TOE)
949 tcp_offload_rcvd(tp);
950 else
951 #endif
952 tp->t_fb->tfb_tcp_output(tp);
953 NET_EPOCH_EXIT(et);
954 out:
955 TCPDEBUG2(PRU_RCVD);
956 TCP_PROBE2(debug__user, tp, PRU_RCVD);
957 INP_WUNLOCK(inp);
958 return (error);
959 }
960
961 /*
962 * Do a send by putting data in output queue and updating urgent
963 * marker if URG set. Possibly send more data. Unlike the other
964 * pru_*() routines, the mbuf chains are our responsibility. We
965 * must either enqueue them or free them. The other pru_* routines
966 * generally are caller-frees.
967 */
968 static int
tcp_usr_send(struct socket * so,int flags,struct mbuf * m,struct sockaddr * nam,struct mbuf * control,struct thread * td)969 tcp_usr_send(struct socket *so, int flags, struct mbuf *m,
970 struct sockaddr *nam, struct mbuf *control, struct thread *td)
971 {
972 struct epoch_tracker et;
973 int error = 0;
974 struct inpcb *inp;
975 struct tcpcb *tp = NULL;
976 #ifdef INET
977 #ifdef INET6
978 struct sockaddr_in sin;
979 #endif
980 struct sockaddr_in *sinp;
981 #endif
982 #ifdef INET6
983 int isipv6;
984 #endif
985 u_int8_t incflagsav;
986 u_char vflagsav;
987 bool restoreflags;
988 TCPDEBUG0;
989
990 /*
991 * We require the pcbinfo "read lock" if we will close the socket
992 * as part of this call.
993 */
994 NET_EPOCH_ENTER(et);
995 inp = sotoinpcb(so);
996 KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL"));
997 INP_WLOCK(inp);
998 vflagsav = inp->inp_vflag;
999 incflagsav = inp->inp_inc.inc_flags;
1000 restoreflags = false;
1001 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1002 if (control)
1003 m_freem(control);
1004 error = ECONNRESET;
1005 goto out;
1006 }
1007 if (control != NULL) {
1008 /* TCP doesn't do control messages (rights, creds, etc) */
1009 if (control->m_len) {
1010 m_freem(control);
1011 error = EINVAL;
1012 goto out;
1013 }
1014 m_freem(control); /* empty control, just free it */
1015 control = NULL;
1016 }
1017 tp = intotcpcb(inp);
1018 if ((flags & PRUS_OOB) != 0 &&
1019 (error = tcp_pru_options_support(tp, PRUS_OOB)) != 0)
1020 goto out;
1021
1022 TCPDEBUG1();
1023 if (nam != NULL && tp->t_state < TCPS_SYN_SENT) {
1024 switch (nam->sa_family) {
1025 #ifdef INET
1026 case AF_INET:
1027 sinp = (struct sockaddr_in *)nam;
1028 if (sinp->sin_len != sizeof(struct sockaddr_in)) {
1029 error = EINVAL;
1030 goto out;
1031 }
1032 if ((inp->inp_vflag & INP_IPV6) != 0) {
1033 error = EAFNOSUPPORT;
1034 goto out;
1035 }
1036 if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
1037 error = EAFNOSUPPORT;
1038 goto out;
1039 }
1040 if (ntohl(sinp->sin_addr.s_addr) == INADDR_BROADCAST) {
1041 error = EACCES;
1042 goto out;
1043 }
1044 if ((error = prison_remote_ip4(td->td_ucred,
1045 &sinp->sin_addr)))
1046 goto out;
1047 #ifdef INET6
1048 isipv6 = 0;
1049 #endif
1050 break;
1051 #endif /* INET */
1052 #ifdef INET6
1053 case AF_INET6:
1054 {
1055 struct sockaddr_in6 *sin6;
1056
1057 sin6 = (struct sockaddr_in6 *)nam;
1058 if (sin6->sin6_len != sizeof(*sin6)) {
1059 error = EINVAL;
1060 goto out;
1061 }
1062 if ((inp->inp_vflag & INP_IPV6PROTO) == 0) {
1063 error = EAFNOSUPPORT;
1064 goto out;
1065 }
1066 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
1067 error = EAFNOSUPPORT;
1068 goto out;
1069 }
1070 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
1071 #ifdef INET
1072 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
1073 error = EINVAL;
1074 goto out;
1075 }
1076 if ((inp->inp_vflag & INP_IPV4) == 0) {
1077 error = EAFNOSUPPORT;
1078 goto out;
1079 }
1080 restoreflags = true;
1081 inp->inp_vflag &= ~INP_IPV6;
1082 sinp = &sin;
1083 in6_sin6_2_sin(sinp, sin6);
1084 if (IN_MULTICAST(
1085 ntohl(sinp->sin_addr.s_addr))) {
1086 error = EAFNOSUPPORT;
1087 goto out;
1088 }
1089 if ((error = prison_remote_ip4(td->td_ucred,
1090 &sinp->sin_addr)))
1091 goto out;
1092 isipv6 = 0;
1093 #else /* !INET */
1094 error = EAFNOSUPPORT;
1095 goto out;
1096 #endif /* INET */
1097 } else {
1098 if ((inp->inp_vflag & INP_IPV6) == 0) {
1099 error = EAFNOSUPPORT;
1100 goto out;
1101 }
1102 restoreflags = true;
1103 inp->inp_vflag &= ~INP_IPV4;
1104 inp->inp_inc.inc_flags |= INC_ISIPV6;
1105 if ((error = prison_remote_ip6(td->td_ucred,
1106 &sin6->sin6_addr)))
1107 goto out;
1108 isipv6 = 1;
1109 }
1110 break;
1111 }
1112 #endif /* INET6 */
1113 default:
1114 error = EAFNOSUPPORT;
1115 goto out;
1116 }
1117 }
1118 if (!(flags & PRUS_OOB)) {
1119 sbappendstream(&so->so_snd, m, flags);
1120 m = NULL;
1121 if (nam && tp->t_state < TCPS_SYN_SENT) {
1122 /*
1123 * Do implied connect if not yet connected,
1124 * initialize window to default value, and
1125 * initialize maxseg using peer's cached MSS.
1126 */
1127 #ifdef INET6
1128 if (isipv6)
1129 error = tcp6_connect(tp, nam, td);
1130 #endif /* INET6 */
1131 #if defined(INET6) && defined(INET)
1132 else
1133 #endif
1134 #ifdef INET
1135 error = tcp_connect(tp,
1136 (struct sockaddr *)sinp, td);
1137 #endif
1138 /*
1139 * The bind operation in tcp_connect succeeded. We
1140 * no longer want to restore the flags if later
1141 * operations fail.
1142 */
1143 if (error == 0 || inp->inp_lport != 0)
1144 restoreflags = false;
1145
1146 if (error) {
1147 /* m is freed if PRUS_NOTREADY is unset. */
1148 sbflush(&so->so_snd);
1149 goto out;
1150 }
1151 if (IS_FASTOPEN(tp->t_flags))
1152 tcp_fastopen_connect(tp);
1153 else {
1154 tp->snd_wnd = TTCP_CLIENT_SND_WND;
1155 tcp_mss(tp, -1);
1156 }
1157 }
1158 if (flags & PRUS_EOF) {
1159 /*
1160 * Close the send side of the connection after
1161 * the data is sent.
1162 */
1163 socantsendmore(so);
1164 tcp_usrclosed(tp);
1165 }
1166 if (TCPS_HAVEESTABLISHED(tp->t_state) &&
1167 ((tp->t_flags2 & TF2_FBYTES_COMPLETE) == 0) &&
1168 (tp->t_fbyte_out == 0) &&
1169 (so->so_snd.sb_ccc > 0)) {
1170 tp->t_fbyte_out = ticks;
1171 if (tp->t_fbyte_out == 0)
1172 tp->t_fbyte_out = 1;
1173 if (tp->t_fbyte_out && tp->t_fbyte_in)
1174 tp->t_flags2 |= TF2_FBYTES_COMPLETE;
1175 }
1176 if (!(inp->inp_flags & INP_DROPPED) &&
1177 !(flags & PRUS_NOTREADY)) {
1178 if (flags & PRUS_MORETOCOME)
1179 tp->t_flags |= TF_MORETOCOME;
1180 error = tp->t_fb->tfb_tcp_output(tp);
1181 if (flags & PRUS_MORETOCOME)
1182 tp->t_flags &= ~TF_MORETOCOME;
1183 }
1184 } else {
1185 /*
1186 * XXXRW: PRUS_EOF not implemented with PRUS_OOB?
1187 */
1188 SOCKBUF_LOCK(&so->so_snd);
1189 if (sbspace(&so->so_snd) < -512) {
1190 SOCKBUF_UNLOCK(&so->so_snd);
1191 error = ENOBUFS;
1192 goto out;
1193 }
1194 /*
1195 * According to RFC961 (Assigned Protocols),
1196 * the urgent pointer points to the last octet
1197 * of urgent data. We continue, however,
1198 * to consider it to indicate the first octet
1199 * of data past the urgent section.
1200 * Otherwise, snd_up should be one lower.
1201 */
1202 sbappendstream_locked(&so->so_snd, m, flags);
1203 SOCKBUF_UNLOCK(&so->so_snd);
1204 m = NULL;
1205 if (nam && tp->t_state < TCPS_SYN_SENT) {
1206 /*
1207 * Do implied connect if not yet connected,
1208 * initialize window to default value, and
1209 * initialize maxseg using peer's cached MSS.
1210 */
1211
1212 /*
1213 * Not going to contemplate SYN|URG
1214 */
1215 if (IS_FASTOPEN(tp->t_flags))
1216 tp->t_flags &= ~TF_FASTOPEN;
1217 #ifdef INET6
1218 if (isipv6)
1219 error = tcp6_connect(tp, nam, td);
1220 #endif /* INET6 */
1221 #if defined(INET6) && defined(INET)
1222 else
1223 #endif
1224 #ifdef INET
1225 error = tcp_connect(tp,
1226 (struct sockaddr *)sinp, td);
1227 #endif
1228 /*
1229 * The bind operation in tcp_connect succeeded. We
1230 * no longer want to restore the flags if later
1231 * operations fail.
1232 */
1233 if (error == 0 || inp->inp_lport != 0)
1234 restoreflags = false;
1235
1236 if (error != 0) {
1237 /* m is freed if PRUS_NOTREADY is unset. */
1238 sbflush(&so->so_snd);
1239 goto out;
1240 }
1241 tp->snd_wnd = TTCP_CLIENT_SND_WND;
1242 tcp_mss(tp, -1);
1243 }
1244 tp->snd_up = tp->snd_una + sbavail(&so->so_snd);
1245 if ((flags & PRUS_NOTREADY) == 0) {
1246 tp->t_flags |= TF_FORCEDATA;
1247 error = tp->t_fb->tfb_tcp_output(tp);
1248 tp->t_flags &= ~TF_FORCEDATA;
1249 }
1250 }
1251 TCP_LOG_EVENT(tp, NULL,
1252 &inp->inp_socket->so_rcv,
1253 &inp->inp_socket->so_snd,
1254 TCP_LOG_USERSEND, error,
1255 0, NULL, false);
1256
1257 out:
1258 /*
1259 * In case of PRUS_NOTREADY, the caller or tcp_usr_ready() is
1260 * responsible for freeing memory.
1261 */
1262 if (m != NULL && (flags & PRUS_NOTREADY) == 0)
1263 m_freem(m);
1264
1265 /*
1266 * If the request was unsuccessful and we changed flags,
1267 * restore the original flags.
1268 */
1269 if (error != 0 && restoreflags) {
1270 inp->inp_vflag = vflagsav;
1271 inp->inp_inc.inc_flags = incflagsav;
1272 }
1273 TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB :
1274 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
1275 TCP_PROBE2(debug__user, tp, (flags & PRUS_OOB) ? PRU_SENDOOB :
1276 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
1277 INP_WUNLOCK(inp);
1278 NET_EPOCH_EXIT(et);
1279 return (error);
1280 }
1281
1282 static int
tcp_usr_ready(struct socket * so,struct mbuf * m,int count)1283 tcp_usr_ready(struct socket *so, struct mbuf *m, int count)
1284 {
1285 struct epoch_tracker et;
1286 struct inpcb *inp;
1287 struct tcpcb *tp;
1288 int error;
1289
1290 inp = sotoinpcb(so);
1291 INP_WLOCK(inp);
1292 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1293 INP_WUNLOCK(inp);
1294 mb_free_notready(m, count);
1295 return (ECONNRESET);
1296 }
1297 tp = intotcpcb(inp);
1298
1299 SOCKBUF_LOCK(&so->so_snd);
1300 error = sbready(&so->so_snd, m, count);
1301 SOCKBUF_UNLOCK(&so->so_snd);
1302 if (error == 0) {
1303 NET_EPOCH_ENTER(et);
1304 error = tp->t_fb->tfb_tcp_output(tp);
1305 NET_EPOCH_EXIT(et);
1306 }
1307 INP_WUNLOCK(inp);
1308
1309 return (error);
1310 }
1311
1312 /*
1313 * Abort the TCP. Drop the connection abruptly.
1314 */
1315 static void
tcp_usr_abort(struct socket * so)1316 tcp_usr_abort(struct socket *so)
1317 {
1318 struct inpcb *inp;
1319 struct tcpcb *tp = NULL;
1320 struct epoch_tracker et;
1321 TCPDEBUG0;
1322
1323 inp = sotoinpcb(so);
1324 KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL"));
1325
1326 NET_EPOCH_ENTER(et);
1327 INP_WLOCK(inp);
1328 KASSERT(inp->inp_socket != NULL,
1329 ("tcp_usr_abort: inp_socket == NULL"));
1330
1331 /*
1332 * If we still have full TCP state, and we're not dropped, drop.
1333 */
1334 if (!(inp->inp_flags & INP_TIMEWAIT) &&
1335 !(inp->inp_flags & INP_DROPPED)) {
1336 tp = intotcpcb(inp);
1337 TCPDEBUG1();
1338 tp = tcp_drop(tp, ECONNABORTED);
1339 if (tp == NULL)
1340 goto dropped;
1341 TCPDEBUG2(PRU_ABORT);
1342 TCP_PROBE2(debug__user, tp, PRU_ABORT);
1343 }
1344 if (!(inp->inp_flags & INP_DROPPED)) {
1345 SOCK_LOCK(so);
1346 so->so_state |= SS_PROTOREF;
1347 SOCK_UNLOCK(so);
1348 inp->inp_flags |= INP_SOCKREF;
1349 }
1350 INP_WUNLOCK(inp);
1351 dropped:
1352 NET_EPOCH_EXIT(et);
1353 }
1354
1355 /*
1356 * TCP socket is closed. Start friendly disconnect.
1357 */
1358 static void
tcp_usr_close(struct socket * so)1359 tcp_usr_close(struct socket *so)
1360 {
1361 struct inpcb *inp;
1362 struct tcpcb *tp = NULL;
1363 struct epoch_tracker et;
1364 TCPDEBUG0;
1365
1366 inp = sotoinpcb(so);
1367 KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL"));
1368
1369 NET_EPOCH_ENTER(et);
1370 INP_WLOCK(inp);
1371 KASSERT(inp->inp_socket != NULL,
1372 ("tcp_usr_close: inp_socket == NULL"));
1373
1374 /*
1375 * If we still have full TCP state, and we're not dropped, initiate
1376 * a disconnect.
1377 */
1378 if (!(inp->inp_flags & INP_TIMEWAIT) &&
1379 !(inp->inp_flags & INP_DROPPED)) {
1380 tp = intotcpcb(inp);
1381 TCPDEBUG1();
1382 tcp_disconnect(tp);
1383 TCPDEBUG2(PRU_CLOSE);
1384 TCP_PROBE2(debug__user, tp, PRU_CLOSE);
1385 }
1386 if (!(inp->inp_flags & INP_DROPPED)) {
1387 SOCK_LOCK(so);
1388 so->so_state |= SS_PROTOREF;
1389 SOCK_UNLOCK(so);
1390 inp->inp_flags |= INP_SOCKREF;
1391 }
1392 INP_WUNLOCK(inp);
1393 NET_EPOCH_EXIT(et);
1394 }
1395
1396 static int
tcp_pru_options_support(struct tcpcb * tp,int flags)1397 tcp_pru_options_support(struct tcpcb *tp, int flags)
1398 {
1399 /*
1400 * If the specific TCP stack has a pru_options
1401 * specified then it does not always support
1402 * all the PRU_XX options and we must ask it.
1403 * If the function is not specified then all
1404 * of the PRU_XX options are supported.
1405 */
1406 int ret = 0;
1407
1408 if (tp->t_fb->tfb_pru_options) {
1409 ret = (*tp->t_fb->tfb_pru_options)(tp, flags);
1410 }
1411 return (ret);
1412 }
1413
1414 /*
1415 * Receive out-of-band data.
1416 */
1417 static int
tcp_usr_rcvoob(struct socket * so,struct mbuf * m,int flags)1418 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags)
1419 {
1420 int error = 0;
1421 struct inpcb *inp;
1422 struct tcpcb *tp = NULL;
1423
1424 TCPDEBUG0;
1425 inp = sotoinpcb(so);
1426 KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL"));
1427 INP_WLOCK(inp);
1428 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1429 error = ECONNRESET;
1430 goto out;
1431 }
1432 tp = intotcpcb(inp);
1433 error = tcp_pru_options_support(tp, PRUS_OOB);
1434 if (error) {
1435 goto out;
1436 }
1437 TCPDEBUG1();
1438 if ((so->so_oobmark == 0 &&
1439 (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) ||
1440 so->so_options & SO_OOBINLINE ||
1441 tp->t_oobflags & TCPOOB_HADDATA) {
1442 error = EINVAL;
1443 goto out;
1444 }
1445 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
1446 error = EWOULDBLOCK;
1447 goto out;
1448 }
1449 m->m_len = 1;
1450 *mtod(m, caddr_t) = tp->t_iobc;
1451 if ((flags & MSG_PEEK) == 0)
1452 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
1453
1454 out:
1455 TCPDEBUG2(PRU_RCVOOB);
1456 TCP_PROBE2(debug__user, tp, PRU_RCVOOB);
1457 INP_WUNLOCK(inp);
1458 return (error);
1459 }
1460
1461 #ifdef INET
1462 struct pr_usrreqs tcp_usrreqs = {
1463 .pru_abort = tcp_usr_abort,
1464 .pru_accept = tcp_usr_accept,
1465 .pru_attach = tcp_usr_attach,
1466 .pru_bind = tcp_usr_bind,
1467 .pru_connect = tcp_usr_connect,
1468 .pru_control = in_control,
1469 .pru_detach = tcp_usr_detach,
1470 .pru_disconnect = tcp_usr_disconnect,
1471 .pru_listen = tcp_usr_listen,
1472 .pru_peeraddr = in_getpeeraddr,
1473 .pru_rcvd = tcp_usr_rcvd,
1474 .pru_rcvoob = tcp_usr_rcvoob,
1475 .pru_send = tcp_usr_send,
1476 .pru_ready = tcp_usr_ready,
1477 .pru_shutdown = tcp_usr_shutdown,
1478 .pru_sockaddr = in_getsockaddr,
1479 .pru_sosetlabel = in_pcbsosetlabel,
1480 .pru_close = tcp_usr_close,
1481 };
1482 #endif /* INET */
1483
1484 #ifdef INET6
1485 struct pr_usrreqs tcp6_usrreqs = {
1486 .pru_abort = tcp_usr_abort,
1487 .pru_accept = tcp6_usr_accept,
1488 .pru_attach = tcp_usr_attach,
1489 .pru_bind = tcp6_usr_bind,
1490 .pru_connect = tcp6_usr_connect,
1491 .pru_control = in6_control,
1492 .pru_detach = tcp_usr_detach,
1493 .pru_disconnect = tcp_usr_disconnect,
1494 .pru_listen = tcp6_usr_listen,
1495 .pru_peeraddr = in6_mapped_peeraddr,
1496 .pru_rcvd = tcp_usr_rcvd,
1497 .pru_rcvoob = tcp_usr_rcvoob,
1498 .pru_send = tcp_usr_send,
1499 .pru_ready = tcp_usr_ready,
1500 .pru_shutdown = tcp_usr_shutdown,
1501 .pru_sockaddr = in6_mapped_sockaddr,
1502 .pru_sosetlabel = in_pcbsosetlabel,
1503 .pru_close = tcp_usr_close,
1504 };
1505 #endif /* INET6 */
1506
1507 #ifdef INET
1508 /*
1509 * Common subroutine to open a TCP connection to remote host specified
1510 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local
1511 * port number if needed. Call in_pcbconnect_setup to do the routing and
1512 * to choose a local host address (interface). If there is an existing
1513 * incarnation of the same connection in TIME-WAIT state and if the remote
1514 * host was sending CC options and if the connection duration was < MSL, then
1515 * truncate the previous TIME-WAIT state and proceed.
1516 * Initialize connection parameters and enter SYN-SENT state.
1517 */
1518 static int
tcp_connect(struct tcpcb * tp,struct sockaddr * nam,struct thread * td)1519 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1520 {
1521 struct inpcb *inp = tp->t_inpcb, *oinp;
1522 struct socket *so = inp->inp_socket;
1523 struct in_addr laddr;
1524 u_short lport;
1525 int error;
1526
1527 NET_EPOCH_ASSERT();
1528 INP_WLOCK_ASSERT(inp);
1529 INP_HASH_WLOCK(&V_tcbinfo);
1530
1531 if (V_tcp_require_unique_port && inp->inp_lport == 0) {
1532 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1533 if (error)
1534 goto out;
1535 }
1536
1537 /*
1538 * Cannot simply call in_pcbconnect, because there might be an
1539 * earlier incarnation of this same connection still in
1540 * TIME_WAIT state, creating an ADDRINUSE error.
1541 */
1542 laddr = inp->inp_laddr;
1543 lport = inp->inp_lport;
1544 error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport,
1545 &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred);
1546 if (error && oinp == NULL)
1547 goto out;
1548 if (oinp) {
1549 error = EADDRINUSE;
1550 goto out;
1551 }
1552 /* Handle initial bind if it hadn't been done in advance. */
1553 if (inp->inp_lport == 0) {
1554 inp->inp_lport = lport;
1555 if (in_pcbinshash(inp) != 0) {
1556 inp->inp_lport = 0;
1557 error = EAGAIN;
1558 goto out;
1559 }
1560 }
1561 inp->inp_laddr = laddr;
1562 in_pcbrehash(inp);
1563 INP_HASH_WUNLOCK(&V_tcbinfo);
1564
1565 /*
1566 * Compute window scaling to request:
1567 * Scale to fit into sweet spot. See tcp_syncache.c.
1568 * XXX: This should move to tcp_output().
1569 */
1570 while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1571 (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1572 tp->request_r_scale++;
1573
1574 soisconnecting(so);
1575 TCPSTAT_INC(tcps_connattempt);
1576 tcp_state_change(tp, TCPS_SYN_SENT);
1577 tp->iss = tcp_new_isn(&inp->inp_inc);
1578 if (tp->t_flags & TF_REQ_TSTMP)
1579 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc);
1580 tcp_sendseqinit(tp);
1581
1582 return 0;
1583
1584 out:
1585 INP_HASH_WUNLOCK(&V_tcbinfo);
1586 return (error);
1587 }
1588 #endif /* INET */
1589
1590 #ifdef INET6
1591 static int
tcp6_connect(struct tcpcb * tp,struct sockaddr * nam,struct thread * td)1592 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1593 {
1594 struct inpcb *inp = tp->t_inpcb;
1595 int error;
1596
1597 INP_WLOCK_ASSERT(inp);
1598 INP_HASH_WLOCK(&V_tcbinfo);
1599
1600 if (V_tcp_require_unique_port && inp->inp_lport == 0) {
1601 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1602 if (error)
1603 goto out;
1604 }
1605 error = in6_pcbconnect(inp, nam, td->td_ucred);
1606 if (error != 0)
1607 goto out;
1608 INP_HASH_WUNLOCK(&V_tcbinfo);
1609
1610 /* Compute window scaling to request. */
1611 while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1612 (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1613 tp->request_r_scale++;
1614
1615 soisconnecting(inp->inp_socket);
1616 TCPSTAT_INC(tcps_connattempt);
1617 tcp_state_change(tp, TCPS_SYN_SENT);
1618 tp->iss = tcp_new_isn(&inp->inp_inc);
1619 if (tp->t_flags & TF_REQ_TSTMP)
1620 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc);
1621 tcp_sendseqinit(tp);
1622
1623 return 0;
1624
1625 out:
1626 INP_HASH_WUNLOCK(&V_tcbinfo);
1627 return error;
1628 }
1629 #endif /* INET6 */
1630
1631 /*
1632 * Export TCP internal state information via a struct tcp_info, based on the
1633 * Linux 2.6 API. Not ABI compatible as our constants are mapped differently
1634 * (TCP state machine, etc). We export all information using FreeBSD-native
1635 * constants -- for example, the numeric values for tcpi_state will differ
1636 * from Linux.
1637 */
1638 static void
tcp_fill_info(struct tcpcb * tp,struct tcp_info * ti)1639 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti)
1640 {
1641
1642 INP_WLOCK_ASSERT(tp->t_inpcb);
1643 bzero(ti, sizeof(*ti));
1644
1645 ti->tcpi_state = tp->t_state;
1646 if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP))
1647 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS;
1648 if (tp->t_flags & TF_SACK_PERMIT)
1649 ti->tcpi_options |= TCPI_OPT_SACK;
1650 if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) {
1651 ti->tcpi_options |= TCPI_OPT_WSCALE;
1652 ti->tcpi_snd_wscale = tp->snd_scale;
1653 ti->tcpi_rcv_wscale = tp->rcv_scale;
1654 }
1655 if (tp->t_flags2 & TF2_ECN_PERMIT)
1656 ti->tcpi_options |= TCPI_OPT_ECN;
1657
1658 ti->tcpi_rto = tp->t_rxtcur * tick;
1659 ti->tcpi_last_data_recv = ((uint32_t)ticks - tp->t_rcvtime) * tick;
1660 ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT;
1661 ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT;
1662
1663 ti->tcpi_snd_ssthresh = tp->snd_ssthresh;
1664 ti->tcpi_snd_cwnd = tp->snd_cwnd;
1665
1666 /*
1667 * FreeBSD-specific extension fields for tcp_info.
1668 */
1669 ti->tcpi_rcv_space = tp->rcv_wnd;
1670 ti->tcpi_rcv_nxt = tp->rcv_nxt;
1671 ti->tcpi_snd_wnd = tp->snd_wnd;
1672 ti->tcpi_snd_bwnd = 0; /* Unused, kept for compat. */
1673 ti->tcpi_snd_nxt = tp->snd_nxt;
1674 ti->tcpi_snd_mss = tp->t_maxseg;
1675 ti->tcpi_rcv_mss = tp->t_maxseg;
1676 ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack;
1677 ti->tcpi_rcv_ooopack = tp->t_rcvoopack;
1678 ti->tcpi_snd_zerowin = tp->t_sndzerowin;
1679 #ifdef TCP_OFFLOAD
1680 if (tp->t_flags & TF_TOE) {
1681 ti->tcpi_options |= TCPI_OPT_TOE;
1682 tcp_offload_tcp_info(tp, ti);
1683 }
1684 #endif
1685 }
1686
1687 /*
1688 * tcp_ctloutput() must drop the inpcb lock before performing copyin on
1689 * socket option arguments. When it re-acquires the lock after the copy, it
1690 * has to revalidate that the connection is still valid for the socket
1691 * option.
1692 */
1693 #define INP_WLOCK_RECHECK_CLEANUP(inp, cleanup) do { \
1694 INP_WLOCK(inp); \
1695 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { \
1696 INP_WUNLOCK(inp); \
1697 cleanup; \
1698 return (ECONNRESET); \
1699 } \
1700 tp = intotcpcb(inp); \
1701 } while(0)
1702 #define INP_WLOCK_RECHECK(inp) INP_WLOCK_RECHECK_CLEANUP((inp), /* noop */)
1703
1704 int
tcp_ctloutput(struct socket * so,struct sockopt * sopt)1705 tcp_ctloutput(struct socket *so, struct sockopt *sopt)
1706 {
1707 int error;
1708 struct inpcb *inp;
1709 struct tcpcb *tp;
1710 struct tcp_function_block *blk;
1711 struct tcp_function_set fsn;
1712
1713 error = 0;
1714 inp = sotoinpcb(so);
1715 KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL"));
1716 if (sopt->sopt_level != IPPROTO_TCP) {
1717 #ifdef INET6
1718 if (inp->inp_vflag & INP_IPV6PROTO) {
1719 error = ip6_ctloutput(so, sopt);
1720 /*
1721 * In case of the IPV6_USE_MIN_MTU socket option,
1722 * the INC_IPV6MINMTU flag to announce a corresponding
1723 * MSS during the initial handshake.
1724 * If the TCP connection is not in the front states,
1725 * just reduce the MSS being used.
1726 * This avoids the sending of TCP segments which will
1727 * be fragmented at the IPv6 layer.
1728 */
1729 if ((error == 0) &&
1730 (sopt->sopt_dir == SOPT_SET) &&
1731 (sopt->sopt_level == IPPROTO_IPV6) &&
1732 (sopt->sopt_name == IPV6_USE_MIN_MTU)) {
1733 INP_WLOCK(inp);
1734 if ((inp->inp_flags &
1735 (INP_TIMEWAIT | INP_DROPPED))) {
1736 INP_WUNLOCK(inp);
1737 return (ECONNRESET);
1738 }
1739 inp->inp_inc.inc_flags |= INC_IPV6MINMTU;
1740 tp = intotcpcb(inp);
1741 if ((tp->t_state >= TCPS_SYN_SENT) &&
1742 (inp->inp_inc.inc_flags & INC_ISIPV6)) {
1743 struct ip6_pktopts *opt;
1744
1745 opt = inp->in6p_outputopts;
1746 if ((opt != NULL) &&
1747 (opt->ip6po_minmtu ==
1748 IP6PO_MINMTU_ALL)) {
1749 if (tp->t_maxseg > TCP6_MSS) {
1750 tp->t_maxseg = TCP6_MSS;
1751 }
1752 }
1753 }
1754 INP_WUNLOCK(inp);
1755 }
1756 }
1757 #endif /* INET6 */
1758 #if defined(INET6) && defined(INET)
1759 else
1760 #endif
1761 #ifdef INET
1762 {
1763 error = ip_ctloutput(so, sopt);
1764 }
1765 #endif
1766 return (error);
1767 }
1768 INP_WLOCK(inp);
1769 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1770 INP_WUNLOCK(inp);
1771 return (ECONNRESET);
1772 }
1773 tp = intotcpcb(inp);
1774 /*
1775 * Protect the TCP option TCP_FUNCTION_BLK so
1776 * that a sub-function can *never* overwrite this.
1777 */
1778 if ((sopt->sopt_dir == SOPT_SET) &&
1779 (sopt->sopt_name == TCP_FUNCTION_BLK)) {
1780 INP_WUNLOCK(inp);
1781 error = sooptcopyin(sopt, &fsn, sizeof fsn,
1782 sizeof fsn);
1783 if (error)
1784 return (error);
1785 INP_WLOCK_RECHECK(inp);
1786 blk = find_and_ref_tcp_functions(&fsn);
1787 if (blk == NULL) {
1788 INP_WUNLOCK(inp);
1789 return (ENOENT);
1790 }
1791 if (tp->t_fb == blk) {
1792 /* You already have this */
1793 refcount_release(&blk->tfb_refcnt);
1794 INP_WUNLOCK(inp);
1795 return (0);
1796 }
1797 if (tp->t_state != TCPS_CLOSED) {
1798 /*
1799 * The user has advanced the state
1800 * past the initial point, we may not
1801 * be able to switch.
1802 */
1803 if (blk->tfb_tcp_handoff_ok != NULL) {
1804 /*
1805 * Does the stack provide a
1806 * query mechanism, if so it may
1807 * still be possible?
1808 */
1809 error = (*blk->tfb_tcp_handoff_ok)(tp);
1810 } else
1811 error = EINVAL;
1812 if (error) {
1813 refcount_release(&blk->tfb_refcnt);
1814 INP_WUNLOCK(inp);
1815 return(error);
1816 }
1817 }
1818 if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) {
1819 refcount_release(&blk->tfb_refcnt);
1820 INP_WUNLOCK(inp);
1821 return (ENOENT);
1822 }
1823 /*
1824 * Release the old refcnt, the
1825 * lookup acquired a ref on the
1826 * new one already.
1827 */
1828 if (tp->t_fb->tfb_tcp_fb_fini) {
1829 struct epoch_tracker et;
1830 /*
1831 * Tell the stack to cleanup with 0 i.e.
1832 * the tcb is not going away.
1833 */
1834 NET_EPOCH_ENTER(et);
1835 (*tp->t_fb->tfb_tcp_fb_fini)(tp, 0);
1836 NET_EPOCH_EXIT(et);
1837 }
1838 #ifdef TCPHPTS
1839 /* Assure that we are not on any hpts */
1840 tcp_hpts_remove(tp->t_inpcb, HPTS_REMOVE_ALL);
1841 #endif
1842 if (blk->tfb_tcp_fb_init) {
1843 error = (*blk->tfb_tcp_fb_init)(tp);
1844 if (error) {
1845 refcount_release(&blk->tfb_refcnt);
1846 if (tp->t_fb->tfb_tcp_fb_init) {
1847 if((*tp->t_fb->tfb_tcp_fb_init)(tp) != 0) {
1848 /* Fall back failed, drop the connection */
1849 INP_WUNLOCK(inp);
1850 soabort(so);
1851 return(error);
1852 }
1853 }
1854 goto err_out;
1855 }
1856 }
1857 refcount_release(&tp->t_fb->tfb_refcnt);
1858 tp->t_fb = blk;
1859 #ifdef TCP_OFFLOAD
1860 if (tp->t_flags & TF_TOE) {
1861 tcp_offload_ctloutput(tp, sopt->sopt_dir,
1862 sopt->sopt_name);
1863 }
1864 #endif
1865 err_out:
1866 INP_WUNLOCK(inp);
1867 return (error);
1868 } else if ((sopt->sopt_dir == SOPT_GET) &&
1869 (sopt->sopt_name == TCP_FUNCTION_BLK)) {
1870 strncpy(fsn.function_set_name, tp->t_fb->tfb_tcp_block_name,
1871 TCP_FUNCTION_NAME_LEN_MAX);
1872 fsn.function_set_name[TCP_FUNCTION_NAME_LEN_MAX - 1] = '\0';
1873 fsn.pcbcnt = tp->t_fb->tfb_refcnt;
1874 INP_WUNLOCK(inp);
1875 error = sooptcopyout(sopt, &fsn, sizeof fsn);
1876 return (error);
1877 }
1878 /* Pass in the INP locked, called must unlock it */
1879 return (tp->t_fb->tfb_tcp_ctloutput(so, sopt, inp, tp));
1880 }
1881
1882 /*
1883 * If this assert becomes untrue, we need to change the size of the buf
1884 * variable in tcp_default_ctloutput().
1885 */
1886 #ifdef CTASSERT
1887 CTASSERT(TCP_CA_NAME_MAX <= TCP_LOG_ID_LEN);
1888 CTASSERT(TCP_LOG_REASON_LEN <= TCP_LOG_ID_LEN);
1889 #endif
1890
1891 #ifdef KERN_TLS
1892 static int
copyin_tls_enable(struct sockopt * sopt,struct tls_enable * tls)1893 copyin_tls_enable(struct sockopt *sopt, struct tls_enable *tls)
1894 {
1895 struct tls_enable_v0 tls_v0;
1896 int error;
1897
1898 if (sopt->sopt_valsize == sizeof(tls_v0)) {
1899 error = sooptcopyin(sopt, &tls_v0, sizeof(tls_v0),
1900 sizeof(tls_v0));
1901 if (error)
1902 return (error);
1903 memset(tls, 0, sizeof(*tls));
1904 tls->cipher_key = tls_v0.cipher_key;
1905 tls->iv = tls_v0.iv;
1906 tls->auth_key = tls_v0.auth_key;
1907 tls->cipher_algorithm = tls_v0.cipher_algorithm;
1908 tls->cipher_key_len = tls_v0.cipher_key_len;
1909 tls->iv_len = tls_v0.iv_len;
1910 tls->auth_algorithm = tls_v0.auth_algorithm;
1911 tls->auth_key_len = tls_v0.auth_key_len;
1912 tls->flags = tls_v0.flags;
1913 tls->tls_vmajor = tls_v0.tls_vmajor;
1914 tls->tls_vminor = tls_v0.tls_vminor;
1915 return (0);
1916 }
1917
1918 return (sooptcopyin(sopt, tls, sizeof(*tls), sizeof(*tls)));
1919 }
1920 #endif
1921
1922 int
tcp_default_ctloutput(struct socket * so,struct sockopt * sopt,struct inpcb * inp,struct tcpcb * tp)1923 tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp)
1924 {
1925 int error, opt, optval;
1926 u_int ui;
1927 struct tcp_info ti;
1928 #ifdef KERN_TLS
1929 struct tls_enable tls;
1930 #endif
1931 struct cc_algo *algo;
1932 char *pbuf, buf[TCP_LOG_ID_LEN];
1933 #ifdef STATS
1934 struct statsblob *sbp;
1935 #endif
1936 size_t len;
1937
1938 /*
1939 * For TCP_CCALGOOPT forward the control to CC module, for both
1940 * SOPT_SET and SOPT_GET.
1941 */
1942 switch (sopt->sopt_name) {
1943 case TCP_CCALGOOPT:
1944 INP_WUNLOCK(inp);
1945 if (sopt->sopt_valsize > CC_ALGOOPT_LIMIT)
1946 return (EINVAL);
1947 pbuf = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK | M_ZERO);
1948 error = sooptcopyin(sopt, pbuf, sopt->sopt_valsize,
1949 sopt->sopt_valsize);
1950 if (error) {
1951 free(pbuf, M_TEMP);
1952 return (error);
1953 }
1954 INP_WLOCK_RECHECK_CLEANUP(inp, free(pbuf, M_TEMP));
1955 if (CC_ALGO(tp)->ctl_output != NULL)
1956 error = CC_ALGO(tp)->ctl_output(tp->ccv, sopt, pbuf);
1957 else
1958 error = ENOENT;
1959 INP_WUNLOCK(inp);
1960 if (error == 0 && sopt->sopt_dir == SOPT_GET)
1961 error = sooptcopyout(sopt, pbuf, sopt->sopt_valsize);
1962 free(pbuf, M_TEMP);
1963 return (error);
1964 }
1965
1966 switch (sopt->sopt_dir) {
1967 case SOPT_SET:
1968 switch (sopt->sopt_name) {
1969 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
1970 case TCP_MD5SIG:
1971 if (!TCPMD5_ENABLED()) {
1972 INP_WUNLOCK(inp);
1973 return (ENOPROTOOPT);
1974 }
1975 error = TCPMD5_PCBCTL(inp, sopt);
1976 if (error)
1977 return (error);
1978 goto unlock_and_done;
1979 #endif /* IPSEC */
1980
1981 case TCP_NODELAY:
1982 case TCP_NOOPT:
1983 INP_WUNLOCK(inp);
1984 error = sooptcopyin(sopt, &optval, sizeof optval,
1985 sizeof optval);
1986 if (error)
1987 return (error);
1988
1989 INP_WLOCK_RECHECK(inp);
1990 switch (sopt->sopt_name) {
1991 case TCP_NODELAY:
1992 opt = TF_NODELAY;
1993 break;
1994 case TCP_NOOPT:
1995 opt = TF_NOOPT;
1996 break;
1997 default:
1998 opt = 0; /* dead code to fool gcc */
1999 break;
2000 }
2001
2002 if (optval)
2003 tp->t_flags |= opt;
2004 else
2005 tp->t_flags &= ~opt;
2006 unlock_and_done:
2007 #ifdef TCP_OFFLOAD
2008 if (tp->t_flags & TF_TOE) {
2009 tcp_offload_ctloutput(tp, sopt->sopt_dir,
2010 sopt->sopt_name);
2011 }
2012 #endif
2013 INP_WUNLOCK(inp);
2014 break;
2015
2016 case TCP_NOPUSH:
2017 INP_WUNLOCK(inp);
2018 error = sooptcopyin(sopt, &optval, sizeof optval,
2019 sizeof optval);
2020 if (error)
2021 return (error);
2022
2023 INP_WLOCK_RECHECK(inp);
2024 if (optval)
2025 tp->t_flags |= TF_NOPUSH;
2026 else if (tp->t_flags & TF_NOPUSH) {
2027 tp->t_flags &= ~TF_NOPUSH;
2028 if (TCPS_HAVEESTABLISHED(tp->t_state)) {
2029 struct epoch_tracker et;
2030
2031 NET_EPOCH_ENTER(et);
2032 error = tp->t_fb->tfb_tcp_output(tp);
2033 NET_EPOCH_EXIT(et);
2034 }
2035 }
2036 goto unlock_and_done;
2037
2038 case TCP_REMOTE_UDP_ENCAPS_PORT:
2039 INP_WUNLOCK(inp);
2040 error = sooptcopyin(sopt, &optval, sizeof optval,
2041 sizeof optval);
2042 if (error)
2043 return (error);
2044 if ((optval < TCP_TUNNELING_PORT_MIN) ||
2045 (optval > TCP_TUNNELING_PORT_MAX)) {
2046 /* Its got to be in range */
2047 return (EINVAL);
2048 }
2049 if ((V_tcp_udp_tunneling_port == 0) && (optval != 0)) {
2050 /* You have to have enabled a UDP tunneling port first */
2051 return (EINVAL);
2052 }
2053 INP_WLOCK_RECHECK(inp);
2054 if (tp->t_state != TCPS_CLOSED) {
2055 /* You can't change after you are connected */
2056 error = EINVAL;
2057 } else {
2058 /* Ok we are all good set the port */
2059 tp->t_port = htons(optval);
2060 }
2061 goto unlock_and_done;
2062
2063 case TCP_MAXSEG:
2064 INP_WUNLOCK(inp);
2065 error = sooptcopyin(sopt, &optval, sizeof optval,
2066 sizeof optval);
2067 if (error)
2068 return (error);
2069
2070 INP_WLOCK_RECHECK(inp);
2071 if (optval > 0 && optval <= tp->t_maxseg &&
2072 optval + 40 >= V_tcp_minmss)
2073 tp->t_maxseg = optval;
2074 else
2075 error = EINVAL;
2076 goto unlock_and_done;
2077
2078 case TCP_INFO:
2079 INP_WUNLOCK(inp);
2080 error = EINVAL;
2081 break;
2082
2083 case TCP_STATS:
2084 INP_WUNLOCK(inp);
2085 #ifdef STATS
2086 error = sooptcopyin(sopt, &optval, sizeof optval,
2087 sizeof optval);
2088 if (error)
2089 return (error);
2090
2091 if (optval > 0)
2092 sbp = stats_blob_alloc(
2093 V_tcp_perconn_stats_dflt_tpl, 0);
2094 else
2095 sbp = NULL;
2096
2097 INP_WLOCK_RECHECK(inp);
2098 if ((tp->t_stats != NULL && sbp == NULL) ||
2099 (tp->t_stats == NULL && sbp != NULL)) {
2100 struct statsblob *t = tp->t_stats;
2101 tp->t_stats = sbp;
2102 sbp = t;
2103 }
2104 INP_WUNLOCK(inp);
2105
2106 stats_blob_destroy(sbp);
2107 #else
2108 return (EOPNOTSUPP);
2109 #endif /* !STATS */
2110 break;
2111
2112 case TCP_CONGESTION:
2113 INP_WUNLOCK(inp);
2114 error = sooptcopyin(sopt, buf, TCP_CA_NAME_MAX - 1, 1);
2115 if (error)
2116 break;
2117 buf[sopt->sopt_valsize] = '\0';
2118 INP_WLOCK_RECHECK(inp);
2119 CC_LIST_RLOCK();
2120 STAILQ_FOREACH(algo, &cc_list, entries)
2121 if (strncmp(buf, algo->name,
2122 TCP_CA_NAME_MAX) == 0)
2123 break;
2124 CC_LIST_RUNLOCK();
2125 if (algo == NULL) {
2126 INP_WUNLOCK(inp);
2127 error = EINVAL;
2128 break;
2129 }
2130 /*
2131 * We hold a write lock over the tcb so it's safe to
2132 * do these things without ordering concerns.
2133 */
2134 if (CC_ALGO(tp)->cb_destroy != NULL)
2135 CC_ALGO(tp)->cb_destroy(tp->ccv);
2136 CC_DATA(tp) = NULL;
2137 CC_ALGO(tp) = algo;
2138 /*
2139 * If something goes pear shaped initialising the new
2140 * algo, fall back to newreno (which does not
2141 * require initialisation).
2142 */
2143 if (algo->cb_init != NULL &&
2144 algo->cb_init(tp->ccv) != 0) {
2145 CC_ALGO(tp) = &newreno_cc_algo;
2146 /*
2147 * The only reason init should fail is
2148 * because of malloc.
2149 */
2150 error = ENOMEM;
2151 }
2152 INP_WUNLOCK(inp);
2153 break;
2154
2155 case TCP_REUSPORT_LB_NUMA:
2156 INP_WUNLOCK(inp);
2157 error = sooptcopyin(sopt, &optval, sizeof(optval),
2158 sizeof(optval));
2159 INP_WLOCK_RECHECK(inp);
2160 if (!error)
2161 error = in_pcblbgroup_numa(inp, optval);
2162 INP_WUNLOCK(inp);
2163 break;
2164
2165 #ifdef KERN_TLS
2166 case TCP_TXTLS_ENABLE:
2167 INP_WUNLOCK(inp);
2168 error = copyin_tls_enable(sopt, &tls);
2169 if (error)
2170 break;
2171 error = ktls_enable_tx(so, &tls);
2172 break;
2173 case TCP_TXTLS_MODE:
2174 INP_WUNLOCK(inp);
2175 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
2176 if (error)
2177 return (error);
2178
2179 INP_WLOCK_RECHECK(inp);
2180 error = ktls_set_tx_mode(so, ui);
2181 INP_WUNLOCK(inp);
2182 break;
2183 case TCP_RXTLS_ENABLE:
2184 INP_WUNLOCK(inp);
2185 error = sooptcopyin(sopt, &tls, sizeof(tls),
2186 sizeof(tls));
2187 if (error)
2188 break;
2189 error = ktls_enable_rx(so, &tls);
2190 break;
2191 #endif
2192
2193 case TCP_KEEPIDLE:
2194 case TCP_KEEPINTVL:
2195 case TCP_KEEPINIT:
2196 INP_WUNLOCK(inp);
2197 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
2198 if (error)
2199 return (error);
2200
2201 if (ui > (UINT_MAX / hz)) {
2202 error = EINVAL;
2203 break;
2204 }
2205 ui *= hz;
2206
2207 INP_WLOCK_RECHECK(inp);
2208 switch (sopt->sopt_name) {
2209 case TCP_KEEPIDLE:
2210 tp->t_keepidle = ui;
2211 /*
2212 * XXX: better check current remaining
2213 * timeout and "merge" it with new value.
2214 */
2215 if ((tp->t_state > TCPS_LISTEN) &&
2216 (tp->t_state <= TCPS_CLOSING))
2217 tcp_timer_activate(tp, TT_KEEP,
2218 TP_KEEPIDLE(tp));
2219 break;
2220 case TCP_KEEPINTVL:
2221 tp->t_keepintvl = ui;
2222 if ((tp->t_state == TCPS_FIN_WAIT_2) &&
2223 (TP_MAXIDLE(tp) > 0))
2224 tcp_timer_activate(tp, TT_2MSL,
2225 TP_MAXIDLE(tp));
2226 break;
2227 case TCP_KEEPINIT:
2228 tp->t_keepinit = ui;
2229 if (tp->t_state == TCPS_SYN_RECEIVED ||
2230 tp->t_state == TCPS_SYN_SENT)
2231 tcp_timer_activate(tp, TT_KEEP,
2232 TP_KEEPINIT(tp));
2233 break;
2234 }
2235 goto unlock_and_done;
2236
2237 case TCP_KEEPCNT:
2238 INP_WUNLOCK(inp);
2239 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
2240 if (error)
2241 return (error);
2242
2243 INP_WLOCK_RECHECK(inp);
2244 tp->t_keepcnt = ui;
2245 if ((tp->t_state == TCPS_FIN_WAIT_2) &&
2246 (TP_MAXIDLE(tp) > 0))
2247 tcp_timer_activate(tp, TT_2MSL,
2248 TP_MAXIDLE(tp));
2249 goto unlock_and_done;
2250
2251 #ifdef TCPPCAP
2252 case TCP_PCAP_OUT:
2253 case TCP_PCAP_IN:
2254 INP_WUNLOCK(inp);
2255 error = sooptcopyin(sopt, &optval, sizeof optval,
2256 sizeof optval);
2257 if (error)
2258 return (error);
2259
2260 INP_WLOCK_RECHECK(inp);
2261 if (optval >= 0)
2262 tcp_pcap_set_sock_max(TCP_PCAP_OUT ?
2263 &(tp->t_outpkts) : &(tp->t_inpkts),
2264 optval);
2265 else
2266 error = EINVAL;
2267 goto unlock_and_done;
2268 #endif
2269
2270 case TCP_FASTOPEN: {
2271 struct tcp_fastopen tfo_optval;
2272
2273 INP_WUNLOCK(inp);
2274 if (!V_tcp_fastopen_client_enable &&
2275 !V_tcp_fastopen_server_enable)
2276 return (EPERM);
2277
2278 error = sooptcopyin(sopt, &tfo_optval,
2279 sizeof(tfo_optval), sizeof(int));
2280 if (error)
2281 return (error);
2282
2283 INP_WLOCK_RECHECK(inp);
2284 if ((tp->t_state != TCPS_CLOSED) &&
2285 (tp->t_state != TCPS_LISTEN)) {
2286 error = EINVAL;
2287 goto unlock_and_done;
2288 }
2289 if (tfo_optval.enable) {
2290 if (tp->t_state == TCPS_LISTEN) {
2291 if (!V_tcp_fastopen_server_enable) {
2292 error = EPERM;
2293 goto unlock_and_done;
2294 }
2295
2296 if (tp->t_tfo_pending == NULL)
2297 tp->t_tfo_pending =
2298 tcp_fastopen_alloc_counter();
2299 } else {
2300 /*
2301 * If a pre-shared key was provided,
2302 * stash it in the client cookie
2303 * field of the tcpcb for use during
2304 * connect.
2305 */
2306 if (sopt->sopt_valsize ==
2307 sizeof(tfo_optval)) {
2308 memcpy(tp->t_tfo_cookie.client,
2309 tfo_optval.psk,
2310 TCP_FASTOPEN_PSK_LEN);
2311 tp->t_tfo_client_cookie_len =
2312 TCP_FASTOPEN_PSK_LEN;
2313 }
2314 }
2315 tp->t_flags |= TF_FASTOPEN;
2316 } else
2317 tp->t_flags &= ~TF_FASTOPEN;
2318 goto unlock_and_done;
2319 }
2320
2321 #ifdef TCP_BLACKBOX
2322 case TCP_LOG:
2323 INP_WUNLOCK(inp);
2324 error = sooptcopyin(sopt, &optval, sizeof optval,
2325 sizeof optval);
2326 if (error)
2327 return (error);
2328
2329 INP_WLOCK_RECHECK(inp);
2330 error = tcp_log_state_change(tp, optval);
2331 goto unlock_and_done;
2332
2333 case TCP_LOGBUF:
2334 INP_WUNLOCK(inp);
2335 error = EINVAL;
2336 break;
2337
2338 case TCP_LOGID:
2339 INP_WUNLOCK(inp);
2340 error = sooptcopyin(sopt, buf, TCP_LOG_ID_LEN - 1, 0);
2341 if (error)
2342 break;
2343 buf[sopt->sopt_valsize] = '\0';
2344 INP_WLOCK_RECHECK(inp);
2345 error = tcp_log_set_id(tp, buf);
2346 /* tcp_log_set_id() unlocks the INP. */
2347 break;
2348
2349 case TCP_LOGDUMP:
2350 case TCP_LOGDUMPID:
2351 INP_WUNLOCK(inp);
2352 error =
2353 sooptcopyin(sopt, buf, TCP_LOG_REASON_LEN - 1, 0);
2354 if (error)
2355 break;
2356 buf[sopt->sopt_valsize] = '\0';
2357 INP_WLOCK_RECHECK(inp);
2358 if (sopt->sopt_name == TCP_LOGDUMP) {
2359 error = tcp_log_dump_tp_logbuf(tp, buf,
2360 M_WAITOK, true);
2361 INP_WUNLOCK(inp);
2362 } else {
2363 tcp_log_dump_tp_bucket_logbufs(tp, buf);
2364 /*
2365 * tcp_log_dump_tp_bucket_logbufs() drops the
2366 * INP lock.
2367 */
2368 }
2369 break;
2370 #endif
2371
2372 default:
2373 INP_WUNLOCK(inp);
2374 error = ENOPROTOOPT;
2375 break;
2376 }
2377 break;
2378
2379 case SOPT_GET:
2380 tp = intotcpcb(inp);
2381 switch (sopt->sopt_name) {
2382 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
2383 case TCP_MD5SIG:
2384 if (!TCPMD5_ENABLED()) {
2385 INP_WUNLOCK(inp);
2386 return (ENOPROTOOPT);
2387 }
2388 error = TCPMD5_PCBCTL(inp, sopt);
2389 break;
2390 #endif
2391
2392 case TCP_NODELAY:
2393 optval = tp->t_flags & TF_NODELAY;
2394 INP_WUNLOCK(inp);
2395 error = sooptcopyout(sopt, &optval, sizeof optval);
2396 break;
2397 case TCP_MAXSEG:
2398 optval = tp->t_maxseg;
2399 INP_WUNLOCK(inp);
2400 error = sooptcopyout(sopt, &optval, sizeof optval);
2401 break;
2402 case TCP_REMOTE_UDP_ENCAPS_PORT:
2403 optval = ntohs(tp->t_port);
2404 INP_WUNLOCK(inp);
2405 error = sooptcopyout(sopt, &optval, sizeof optval);
2406 break;
2407 case TCP_NOOPT:
2408 optval = tp->t_flags & TF_NOOPT;
2409 INP_WUNLOCK(inp);
2410 error = sooptcopyout(sopt, &optval, sizeof optval);
2411 break;
2412 case TCP_NOPUSH:
2413 optval = tp->t_flags & TF_NOPUSH;
2414 INP_WUNLOCK(inp);
2415 error = sooptcopyout(sopt, &optval, sizeof optval);
2416 break;
2417 case TCP_INFO:
2418 tcp_fill_info(tp, &ti);
2419 INP_WUNLOCK(inp);
2420 error = sooptcopyout(sopt, &ti, sizeof ti);
2421 break;
2422 case TCP_STATS:
2423 {
2424 #ifdef STATS
2425 int nheld;
2426 TYPEOF_MEMBER(struct statsblob, flags) sbflags = 0;
2427
2428 error = 0;
2429 socklen_t outsbsz = sopt->sopt_valsize;
2430 if (tp->t_stats == NULL)
2431 error = ENOENT;
2432 else if (outsbsz >= tp->t_stats->cursz)
2433 outsbsz = tp->t_stats->cursz;
2434 else if (outsbsz >= sizeof(struct statsblob))
2435 outsbsz = sizeof(struct statsblob);
2436 else
2437 error = EINVAL;
2438 INP_WUNLOCK(inp);
2439 if (error)
2440 break;
2441
2442 sbp = sopt->sopt_val;
2443 nheld = atop(round_page(((vm_offset_t)sbp) +
2444 (vm_size_t)outsbsz) - trunc_page((vm_offset_t)sbp));
2445 vm_page_t ma[nheld];
2446 if (vm_fault_quick_hold_pages(
2447 &curproc->p_vmspace->vm_map, (vm_offset_t)sbp,
2448 outsbsz, VM_PROT_READ | VM_PROT_WRITE, ma,
2449 nheld) < 0) {
2450 error = EFAULT;
2451 break;
2452 }
2453
2454 if ((error = copyin_nofault(&(sbp->flags), &sbflags,
2455 SIZEOF_MEMBER(struct statsblob, flags))))
2456 goto unhold;
2457
2458 INP_WLOCK_RECHECK(inp);
2459 error = stats_blob_snapshot(&sbp, outsbsz, tp->t_stats,
2460 sbflags | SB_CLONE_USRDSTNOFAULT);
2461 INP_WUNLOCK(inp);
2462 sopt->sopt_valsize = outsbsz;
2463 unhold:
2464 vm_page_unhold_pages(ma, nheld);
2465 #else
2466 INP_WUNLOCK(inp);
2467 error = EOPNOTSUPP;
2468 #endif /* !STATS */
2469 break;
2470 }
2471 case TCP_CONGESTION:
2472 len = strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX);
2473 INP_WUNLOCK(inp);
2474 error = sooptcopyout(sopt, buf, len + 1);
2475 break;
2476 case TCP_KEEPIDLE:
2477 case TCP_KEEPINTVL:
2478 case TCP_KEEPINIT:
2479 case TCP_KEEPCNT:
2480 switch (sopt->sopt_name) {
2481 case TCP_KEEPIDLE:
2482 ui = TP_KEEPIDLE(tp) / hz;
2483 break;
2484 case TCP_KEEPINTVL:
2485 ui = TP_KEEPINTVL(tp) / hz;
2486 break;
2487 case TCP_KEEPINIT:
2488 ui = TP_KEEPINIT(tp) / hz;
2489 break;
2490 case TCP_KEEPCNT:
2491 ui = TP_KEEPCNT(tp);
2492 break;
2493 }
2494 INP_WUNLOCK(inp);
2495 error = sooptcopyout(sopt, &ui, sizeof(ui));
2496 break;
2497 #ifdef TCPPCAP
2498 case TCP_PCAP_OUT:
2499 case TCP_PCAP_IN:
2500 optval = tcp_pcap_get_sock_max(TCP_PCAP_OUT ?
2501 &(tp->t_outpkts) : &(tp->t_inpkts));
2502 INP_WUNLOCK(inp);
2503 error = sooptcopyout(sopt, &optval, sizeof optval);
2504 break;
2505 #endif
2506 case TCP_FASTOPEN:
2507 optval = tp->t_flags & TF_FASTOPEN;
2508 INP_WUNLOCK(inp);
2509 error = sooptcopyout(sopt, &optval, sizeof optval);
2510 break;
2511 #ifdef TCP_BLACKBOX
2512 case TCP_LOG:
2513 optval = tp->t_logstate;
2514 INP_WUNLOCK(inp);
2515 error = sooptcopyout(sopt, &optval, sizeof(optval));
2516 break;
2517 case TCP_LOGBUF:
2518 /* tcp_log_getlogbuf() does INP_WUNLOCK(inp) */
2519 error = tcp_log_getlogbuf(sopt, tp);
2520 break;
2521 case TCP_LOGID:
2522 len = tcp_log_get_id(tp, buf);
2523 INP_WUNLOCK(inp);
2524 error = sooptcopyout(sopt, buf, len + 1);
2525 break;
2526 case TCP_LOGDUMP:
2527 case TCP_LOGDUMPID:
2528 INP_WUNLOCK(inp);
2529 error = EINVAL;
2530 break;
2531 #endif
2532 #ifdef KERN_TLS
2533 case TCP_TXTLS_MODE:
2534 optval = ktls_get_tx_mode(so);
2535 INP_WUNLOCK(inp);
2536 error = sooptcopyout(sopt, &optval, sizeof(optval));
2537 break;
2538 case TCP_RXTLS_MODE:
2539 optval = ktls_get_rx_mode(so);
2540 INP_WUNLOCK(inp);
2541 error = sooptcopyout(sopt, &optval, sizeof(optval));
2542 break;
2543 #endif
2544 default:
2545 INP_WUNLOCK(inp);
2546 error = ENOPROTOOPT;
2547 break;
2548 }
2549 break;
2550 }
2551 return (error);
2552 }
2553 #undef INP_WLOCK_RECHECK
2554 #undef INP_WLOCK_RECHECK_CLEANUP
2555
2556 /*
2557 * Initiate (or continue) disconnect.
2558 * If embryonic state, just send reset (once).
2559 * If in ``let data drain'' option and linger null, just drop.
2560 * Otherwise (hard), mark socket disconnecting and drop
2561 * current input data; switch states based on user close, and
2562 * send segment to peer (with FIN).
2563 */
2564 static void
tcp_disconnect(struct tcpcb * tp)2565 tcp_disconnect(struct tcpcb *tp)
2566 {
2567 struct inpcb *inp = tp->t_inpcb;
2568 struct socket *so = inp->inp_socket;
2569
2570 NET_EPOCH_ASSERT();
2571 INP_WLOCK_ASSERT(inp);
2572
2573 /*
2574 * Neither tcp_close() nor tcp_drop() should return NULL, as the
2575 * socket is still open.
2576 */
2577 if (tp->t_state < TCPS_ESTABLISHED &&
2578 !(tp->t_state > TCPS_LISTEN && IS_FASTOPEN(tp->t_flags))) {
2579 tp = tcp_close(tp);
2580 KASSERT(tp != NULL,
2581 ("tcp_disconnect: tcp_close() returned NULL"));
2582 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
2583 tp = tcp_drop(tp, 0);
2584 KASSERT(tp != NULL,
2585 ("tcp_disconnect: tcp_drop() returned NULL"));
2586 } else {
2587 soisdisconnecting(so);
2588 sbflush(&so->so_rcv);
2589 tcp_usrclosed(tp);
2590 if (!(inp->inp_flags & INP_DROPPED))
2591 tp->t_fb->tfb_tcp_output(tp);
2592 }
2593 }
2594
2595 /*
2596 * User issued close, and wish to trail through shutdown states:
2597 * if never received SYN, just forget it. If got a SYN from peer,
2598 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
2599 * If already got a FIN from peer, then almost done; go to LAST_ACK
2600 * state. In all other cases, have already sent FIN to peer (e.g.
2601 * after PRU_SHUTDOWN), and just have to play tedious game waiting
2602 * for peer to send FIN or not respond to keep-alives, etc.
2603 * We can let the user exit from the close as soon as the FIN is acked.
2604 */
2605 static void
tcp_usrclosed(struct tcpcb * tp)2606 tcp_usrclosed(struct tcpcb *tp)
2607 {
2608
2609 NET_EPOCH_ASSERT();
2610 INP_WLOCK_ASSERT(tp->t_inpcb);
2611
2612 switch (tp->t_state) {
2613 case TCPS_LISTEN:
2614 #ifdef TCP_OFFLOAD
2615 tcp_offload_listen_stop(tp);
2616 #endif
2617 tcp_state_change(tp, TCPS_CLOSED);
2618 /* FALLTHROUGH */
2619 case TCPS_CLOSED:
2620 tp = tcp_close(tp);
2621 /*
2622 * tcp_close() should never return NULL here as the socket is
2623 * still open.
2624 */
2625 KASSERT(tp != NULL,
2626 ("tcp_usrclosed: tcp_close() returned NULL"));
2627 break;
2628
2629 case TCPS_SYN_SENT:
2630 case TCPS_SYN_RECEIVED:
2631 tp->t_flags |= TF_NEEDFIN;
2632 break;
2633
2634 case TCPS_ESTABLISHED:
2635 tcp_state_change(tp, TCPS_FIN_WAIT_1);
2636 break;
2637
2638 case TCPS_CLOSE_WAIT:
2639 tcp_state_change(tp, TCPS_LAST_ACK);
2640 break;
2641 }
2642 if (tp->t_state >= TCPS_FIN_WAIT_2) {
2643 soisdisconnected(tp->t_inpcb->inp_socket);
2644 /* Prevent the connection hanging in FIN_WAIT_2 forever. */
2645 if (tp->t_state == TCPS_FIN_WAIT_2) {
2646 int timeout;
2647
2648 timeout = (tcp_fast_finwait2_recycle) ?
2649 tcp_finwait2_timeout : TP_MAXIDLE(tp);
2650 tcp_timer_activate(tp, TT_2MSL, timeout);
2651 }
2652 }
2653 }
2654
2655 #ifdef DDB
2656 static void
db_print_indent(int indent)2657 db_print_indent(int indent)
2658 {
2659 int i;
2660
2661 for (i = 0; i < indent; i++)
2662 db_printf(" ");
2663 }
2664
2665 static void
db_print_tstate(int t_state)2666 db_print_tstate(int t_state)
2667 {
2668
2669 switch (t_state) {
2670 case TCPS_CLOSED:
2671 db_printf("TCPS_CLOSED");
2672 return;
2673
2674 case TCPS_LISTEN:
2675 db_printf("TCPS_LISTEN");
2676 return;
2677
2678 case TCPS_SYN_SENT:
2679 db_printf("TCPS_SYN_SENT");
2680 return;
2681
2682 case TCPS_SYN_RECEIVED:
2683 db_printf("TCPS_SYN_RECEIVED");
2684 return;
2685
2686 case TCPS_ESTABLISHED:
2687 db_printf("TCPS_ESTABLISHED");
2688 return;
2689
2690 case TCPS_CLOSE_WAIT:
2691 db_printf("TCPS_CLOSE_WAIT");
2692 return;
2693
2694 case TCPS_FIN_WAIT_1:
2695 db_printf("TCPS_FIN_WAIT_1");
2696 return;
2697
2698 case TCPS_CLOSING:
2699 db_printf("TCPS_CLOSING");
2700 return;
2701
2702 case TCPS_LAST_ACK:
2703 db_printf("TCPS_LAST_ACK");
2704 return;
2705
2706 case TCPS_FIN_WAIT_2:
2707 db_printf("TCPS_FIN_WAIT_2");
2708 return;
2709
2710 case TCPS_TIME_WAIT:
2711 db_printf("TCPS_TIME_WAIT");
2712 return;
2713
2714 default:
2715 db_printf("unknown");
2716 return;
2717 }
2718 }
2719
2720 static void
db_print_tflags(u_int t_flags)2721 db_print_tflags(u_int t_flags)
2722 {
2723 int comma;
2724
2725 comma = 0;
2726 if (t_flags & TF_ACKNOW) {
2727 db_printf("%sTF_ACKNOW", comma ? ", " : "");
2728 comma = 1;
2729 }
2730 if (t_flags & TF_DELACK) {
2731 db_printf("%sTF_DELACK", comma ? ", " : "");
2732 comma = 1;
2733 }
2734 if (t_flags & TF_NODELAY) {
2735 db_printf("%sTF_NODELAY", comma ? ", " : "");
2736 comma = 1;
2737 }
2738 if (t_flags & TF_NOOPT) {
2739 db_printf("%sTF_NOOPT", comma ? ", " : "");
2740 comma = 1;
2741 }
2742 if (t_flags & TF_SENTFIN) {
2743 db_printf("%sTF_SENTFIN", comma ? ", " : "");
2744 comma = 1;
2745 }
2746 if (t_flags & TF_REQ_SCALE) {
2747 db_printf("%sTF_REQ_SCALE", comma ? ", " : "");
2748 comma = 1;
2749 }
2750 if (t_flags & TF_RCVD_SCALE) {
2751 db_printf("%sTF_RECVD_SCALE", comma ? ", " : "");
2752 comma = 1;
2753 }
2754 if (t_flags & TF_REQ_TSTMP) {
2755 db_printf("%sTF_REQ_TSTMP", comma ? ", " : "");
2756 comma = 1;
2757 }
2758 if (t_flags & TF_RCVD_TSTMP) {
2759 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : "");
2760 comma = 1;
2761 }
2762 if (t_flags & TF_SACK_PERMIT) {
2763 db_printf("%sTF_SACK_PERMIT", comma ? ", " : "");
2764 comma = 1;
2765 }
2766 if (t_flags & TF_NEEDSYN) {
2767 db_printf("%sTF_NEEDSYN", comma ? ", " : "");
2768 comma = 1;
2769 }
2770 if (t_flags & TF_NEEDFIN) {
2771 db_printf("%sTF_NEEDFIN", comma ? ", " : "");
2772 comma = 1;
2773 }
2774 if (t_flags & TF_NOPUSH) {
2775 db_printf("%sTF_NOPUSH", comma ? ", " : "");
2776 comma = 1;
2777 }
2778 if (t_flags & TF_MORETOCOME) {
2779 db_printf("%sTF_MORETOCOME", comma ? ", " : "");
2780 comma = 1;
2781 }
2782 if (t_flags & TF_LQ_OVERFLOW) {
2783 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : "");
2784 comma = 1;
2785 }
2786 if (t_flags & TF_LASTIDLE) {
2787 db_printf("%sTF_LASTIDLE", comma ? ", " : "");
2788 comma = 1;
2789 }
2790 if (t_flags & TF_RXWIN0SENT) {
2791 db_printf("%sTF_RXWIN0SENT", comma ? ", " : "");
2792 comma = 1;
2793 }
2794 if (t_flags & TF_FASTRECOVERY) {
2795 db_printf("%sTF_FASTRECOVERY", comma ? ", " : "");
2796 comma = 1;
2797 }
2798 if (t_flags & TF_CONGRECOVERY) {
2799 db_printf("%sTF_CONGRECOVERY", comma ? ", " : "");
2800 comma = 1;
2801 }
2802 if (t_flags & TF_WASFRECOVERY) {
2803 db_printf("%sTF_WASFRECOVERY", comma ? ", " : "");
2804 comma = 1;
2805 }
2806 if (t_flags & TF_SIGNATURE) {
2807 db_printf("%sTF_SIGNATURE", comma ? ", " : "");
2808 comma = 1;
2809 }
2810 if (t_flags & TF_FORCEDATA) {
2811 db_printf("%sTF_FORCEDATA", comma ? ", " : "");
2812 comma = 1;
2813 }
2814 if (t_flags & TF_TSO) {
2815 db_printf("%sTF_TSO", comma ? ", " : "");
2816 comma = 1;
2817 }
2818 if (t_flags & TF_FASTOPEN) {
2819 db_printf("%sTF_FASTOPEN", comma ? ", " : "");
2820 comma = 1;
2821 }
2822 }
2823
2824 static void
db_print_tflags2(u_int t_flags2)2825 db_print_tflags2(u_int t_flags2)
2826 {
2827 int comma;
2828
2829 comma = 0;
2830 if (t_flags2 & TF2_ECN_PERMIT) {
2831 db_printf("%sTF2_ECN_PERMIT", comma ? ", " : "");
2832 comma = 1;
2833 }
2834 }
2835
2836 static void
db_print_toobflags(char t_oobflags)2837 db_print_toobflags(char t_oobflags)
2838 {
2839 int comma;
2840
2841 comma = 0;
2842 if (t_oobflags & TCPOOB_HAVEDATA) {
2843 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : "");
2844 comma = 1;
2845 }
2846 if (t_oobflags & TCPOOB_HADDATA) {
2847 db_printf("%sTCPOOB_HADDATA", comma ? ", " : "");
2848 comma = 1;
2849 }
2850 }
2851
2852 static void
db_print_tcpcb(struct tcpcb * tp,const char * name,int indent)2853 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent)
2854 {
2855
2856 db_print_indent(indent);
2857 db_printf("%s at %p\n", name, tp);
2858
2859 indent += 2;
2860
2861 db_print_indent(indent);
2862 db_printf("t_segq first: %p t_segqlen: %d t_dupacks: %d\n",
2863 TAILQ_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks);
2864
2865 db_print_indent(indent);
2866 db_printf("tt_rexmt: %p tt_persist: %p tt_keep: %p\n",
2867 &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep);
2868
2869 db_print_indent(indent);
2870 db_printf("tt_2msl: %p tt_delack: %p t_inpcb: %p\n", &tp->t_timers->tt_2msl,
2871 &tp->t_timers->tt_delack, tp->t_inpcb);
2872
2873 db_print_indent(indent);
2874 db_printf("t_state: %d (", tp->t_state);
2875 db_print_tstate(tp->t_state);
2876 db_printf(")\n");
2877
2878 db_print_indent(indent);
2879 db_printf("t_flags: 0x%x (", tp->t_flags);
2880 db_print_tflags(tp->t_flags);
2881 db_printf(")\n");
2882
2883 db_print_indent(indent);
2884 db_printf("t_flags2: 0x%x (", tp->t_flags2);
2885 db_print_tflags2(tp->t_flags2);
2886 db_printf(")\n");
2887
2888 db_print_indent(indent);
2889 db_printf("snd_una: 0x%08x snd_max: 0x%08x snd_nxt: x0%08x\n",
2890 tp->snd_una, tp->snd_max, tp->snd_nxt);
2891
2892 db_print_indent(indent);
2893 db_printf("snd_up: 0x%08x snd_wl1: 0x%08x snd_wl2: 0x%08x\n",
2894 tp->snd_up, tp->snd_wl1, tp->snd_wl2);
2895
2896 db_print_indent(indent);
2897 db_printf("iss: 0x%08x irs: 0x%08x rcv_nxt: 0x%08x\n",
2898 tp->iss, tp->irs, tp->rcv_nxt);
2899
2900 db_print_indent(indent);
2901 db_printf("rcv_adv: 0x%08x rcv_wnd: %u rcv_up: 0x%08x\n",
2902 tp->rcv_adv, tp->rcv_wnd, tp->rcv_up);
2903
2904 db_print_indent(indent);
2905 db_printf("snd_wnd: %u snd_cwnd: %u\n",
2906 tp->snd_wnd, tp->snd_cwnd);
2907
2908 db_print_indent(indent);
2909 db_printf("snd_ssthresh: %u snd_recover: "
2910 "0x%08x\n", tp->snd_ssthresh, tp->snd_recover);
2911
2912 db_print_indent(indent);
2913 db_printf("t_rcvtime: %u t_startime: %u\n",
2914 tp->t_rcvtime, tp->t_starttime);
2915
2916 db_print_indent(indent);
2917 db_printf("t_rttime: %u t_rtsq: 0x%08x\n",
2918 tp->t_rtttime, tp->t_rtseq);
2919
2920 db_print_indent(indent);
2921 db_printf("t_rxtcur: %d t_maxseg: %u t_srtt: %d\n",
2922 tp->t_rxtcur, tp->t_maxseg, tp->t_srtt);
2923
2924 db_print_indent(indent);
2925 db_printf("t_rttvar: %d t_rxtshift: %d t_rttmin: %u "
2926 "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin,
2927 tp->t_rttbest);
2928
2929 db_print_indent(indent);
2930 db_printf("t_rttupdated: %lu max_sndwnd: %u t_softerror: %d\n",
2931 tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror);
2932
2933 db_print_indent(indent);
2934 db_printf("t_oobflags: 0x%x (", tp->t_oobflags);
2935 db_print_toobflags(tp->t_oobflags);
2936 db_printf(") t_iobc: 0x%02x\n", tp->t_iobc);
2937
2938 db_print_indent(indent);
2939 db_printf("snd_scale: %u rcv_scale: %u request_r_scale: %u\n",
2940 tp->snd_scale, tp->rcv_scale, tp->request_r_scale);
2941
2942 db_print_indent(indent);
2943 db_printf("ts_recent: %u ts_recent_age: %u\n",
2944 tp->ts_recent, tp->ts_recent_age);
2945
2946 db_print_indent(indent);
2947 db_printf("ts_offset: %u last_ack_sent: 0x%08x snd_cwnd_prev: "
2948 "%u\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev);
2949
2950 db_print_indent(indent);
2951 db_printf("snd_ssthresh_prev: %u snd_recover_prev: 0x%08x "
2952 "t_badrxtwin: %u\n", tp->snd_ssthresh_prev,
2953 tp->snd_recover_prev, tp->t_badrxtwin);
2954
2955 db_print_indent(indent);
2956 db_printf("snd_numholes: %d snd_holes first: %p\n",
2957 tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes));
2958
2959 db_print_indent(indent);
2960 db_printf("snd_fack: 0x%08x rcv_numsacks: %d\n",
2961 tp->snd_fack, tp->rcv_numsacks);
2962
2963 /* Skip sackblks, sackhint. */
2964
2965 db_print_indent(indent);
2966 db_printf("t_rttlow: %d rfbuf_ts: %u rfbuf_cnt: %d\n",
2967 tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt);
2968 }
2969
DB_SHOW_COMMAND(tcpcb,db_show_tcpcb)2970 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb)
2971 {
2972 struct tcpcb *tp;
2973
2974 if (!have_addr) {
2975 db_printf("usage: show tcpcb <addr>\n");
2976 return;
2977 }
2978 tp = (struct tcpcb *)addr;
2979
2980 db_print_tcpcb(tp, "tcpcb", 0);
2981 }
2982 #endif
2983