xref: /freebsd/sys/netinet/tcp_usrreq.c (revision a91a246563dffa876a52f53a98de4af9fa364c52)
1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
3  *
4  * Copyright (c) 1982, 1986, 1988, 1993
5  *	The Regents of the University of California.
6  * Copyright (c) 2006-2007 Robert N. M. Watson
7  * Copyright (c) 2010-2011 Juniper Networks, Inc.
8  * All rights reserved.
9  *
10  * Portions of this software were developed by Robert N. M. Watson under
11  * contract to Juniper Networks, Inc.
12  *
13  * Redistribution and use in source and binary forms, with or without
14  * modification, are permitted provided that the following conditions
15  * are met:
16  * 1. Redistributions of source code must retain the above copyright
17  *    notice, this list of conditions and the following disclaimer.
18  * 2. Redistributions in binary form must reproduce the above copyright
19  *    notice, this list of conditions and the following disclaimer in the
20  *    documentation and/or other materials provided with the distribution.
21  * 3. Neither the name of the University nor the names of its contributors
22  *    may be used to endorse or promote products derived from this software
23  *    without specific prior written permission.
24  *
25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35  * SUCH DAMAGE.
36  */
37 
38 #include <sys/cdefs.h>
39 #include "opt_ddb.h"
40 #include "opt_inet.h"
41 #include "opt_inet6.h"
42 #include "opt_ipsec.h"
43 #include "opt_kern_tls.h"
44 
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/arb.h>
48 #include <sys/limits.h>
49 #include <sys/malloc.h>
50 #include <sys/refcount.h>
51 #include <sys/kernel.h>
52 #include <sys/ktls.h>
53 #include <sys/qmath.h>
54 #include <sys/sysctl.h>
55 #include <sys/mbuf.h>
56 #ifdef INET6
57 #include <sys/domain.h>
58 #endif /* INET6 */
59 #include <sys/socket.h>
60 #include <sys/socketvar.h>
61 #include <sys/protosw.h>
62 #include <sys/proc.h>
63 #include <sys/jail.h>
64 #include <sys/stats.h>
65 
66 #ifdef DDB
67 #include <ddb/ddb.h>
68 #endif
69 
70 #include <net/if.h>
71 #include <net/if_var.h>
72 #include <net/route.h>
73 #include <net/vnet.h>
74 
75 #include <netinet/in.h>
76 #include <netinet/in_kdtrace.h>
77 #include <netinet/in_pcb.h>
78 #include <netinet/in_systm.h>
79 #include <netinet/in_var.h>
80 #include <netinet/ip.h>
81 #include <netinet/ip_var.h>
82 #ifdef INET6
83 #include <netinet/ip6.h>
84 #include <netinet6/in6_pcb.h>
85 #include <netinet6/ip6_var.h>
86 #include <netinet6/scope6_var.h>
87 #endif
88 #include <netinet/tcp.h>
89 #include <netinet/tcp_fsm.h>
90 #include <netinet/tcp_seq.h>
91 #include <netinet/tcp_timer.h>
92 #include <netinet/tcp_var.h>
93 #include <netinet/tcp_log_buf.h>
94 #include <netinet/tcpip.h>
95 #include <netinet/cc/cc.h>
96 #include <netinet/tcp_fastopen.h>
97 #include <netinet/tcp_hpts.h>
98 #ifdef TCPPCAP
99 #include <netinet/tcp_pcap.h>
100 #endif
101 #ifdef TCP_OFFLOAD
102 #include <netinet/tcp_offload.h>
103 #endif
104 #include <netipsec/ipsec_support.h>
105 
106 #include <vm/vm.h>
107 #include <vm/vm_param.h>
108 #include <vm/pmap.h>
109 #include <vm/vm_extern.h>
110 #include <vm/vm_map.h>
111 #include <vm/vm_page.h>
112 
113 /*
114  * TCP protocol interface to socket abstraction.
115  */
116 #ifdef INET
117 static int	tcp_connect(struct tcpcb *, struct sockaddr_in *,
118 		    struct thread *td);
119 #endif /* INET */
120 #ifdef INET6
121 static int	tcp6_connect(struct tcpcb *, struct sockaddr_in6 *,
122 		    struct thread *td);
123 #endif /* INET6 */
124 static void	tcp_disconnect(struct tcpcb *);
125 static void	tcp_usrclosed(struct tcpcb *);
126 static void	tcp_fill_info(const struct tcpcb *, struct tcp_info *);
127 
128 static int	tcp_pru_options_support(struct tcpcb *tp, int flags);
129 
130 static void
131 tcp_bblog_pru(struct tcpcb *tp, uint32_t pru, int error)
132 {
133 	struct tcp_log_buffer *lgb;
134 
135 	KASSERT(tp != NULL, ("tcp_bblog_pru: tp == NULL"));
136 	INP_WLOCK_ASSERT(tptoinpcb(tp));
137 	if (tcp_bblogging_on(tp)) {
138 		lgb = tcp_log_event(tp, NULL, NULL, NULL, TCP_LOG_PRU, error,
139 		    0, NULL, false, NULL, NULL, 0, NULL);
140 	} else {
141 		lgb = NULL;
142 	}
143 	if (lgb != NULL) {
144 		if (error >= 0) {
145 			lgb->tlb_errno = (uint32_t)error;
146 		}
147 		lgb->tlb_flex1 = pru;
148 	}
149 }
150 
151 /*
152  * TCP attaches to socket via pru_attach(), reserving space,
153  * and an internet control block.
154  */
155 static int
156 tcp_usr_attach(struct socket *so, int proto, struct thread *td)
157 {
158 	struct inpcb *inp;
159 	struct tcpcb *tp = NULL;
160 	int error;
161 
162 	inp = sotoinpcb(so);
163 	KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL"));
164 
165 	error = soreserve(so, V_tcp_sendspace, V_tcp_recvspace);
166 	if (error)
167 		goto out;
168 
169 	so->so_rcv.sb_flags |= SB_AUTOSIZE;
170 	so->so_snd.sb_flags |= SB_AUTOSIZE;
171 	error = in_pcballoc(so, &V_tcbinfo);
172 	if (error)
173 		goto out;
174 	inp = sotoinpcb(so);
175 	tp = tcp_newtcpcb(inp);
176 	if (tp == NULL) {
177 		error = ENOBUFS;
178 		in_pcbfree(inp);
179 		goto out;
180 	}
181 	tp->t_state = TCPS_CLOSED;
182 	/* Can we inherit anything from the listener? */
183 	if ((so->so_listen != NULL) &&
184 	    (so->so_listen->so_pcb != NULL) &&
185 	    (tp->t_fb->tfb_inherit != NULL)) {
186 		(*tp->t_fb->tfb_inherit)(tp, sotoinpcb(so->so_listen));
187 	}
188 	tcp_bblog_pru(tp, PRU_ATTACH, error);
189 	INP_WUNLOCK(inp);
190 	TCPSTATES_INC(TCPS_CLOSED);
191 out:
192 	TCP_PROBE2(debug__user, tp, PRU_ATTACH);
193 	return (error);
194 }
195 
196 /*
197  * tcp_usr_detach is called when the socket layer loses its final reference
198  * to the socket, be it a file descriptor reference, a reference from TCP,
199  * etc.  At this point, there is only one case in which we will keep around
200  * inpcb state: time wait.
201  */
202 static void
203 tcp_usr_detach(struct socket *so)
204 {
205 	struct inpcb *inp;
206 	struct tcpcb *tp;
207 
208 	inp = sotoinpcb(so);
209 	KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
210 	INP_WLOCK(inp);
211 	KASSERT(so->so_pcb == inp && inp->inp_socket == so,
212 		("%s: socket %p inp %p mismatch", __func__, so, inp));
213 
214 	tp = intotcpcb(inp);
215 
216 	KASSERT(inp->inp_flags & INP_DROPPED ||
217 	    tp->t_state < TCPS_SYN_SENT,
218 	    ("%s: inp %p not dropped or embryonic", __func__, inp));
219 
220 	tcp_discardcb(tp);
221 	in_pcbfree(inp);
222 }
223 
224 #ifdef INET
225 /*
226  * Give the socket an address.
227  */
228 static int
229 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
230 {
231 	int error = 0;
232 	struct inpcb *inp;
233 	struct tcpcb *tp;
234 	struct sockaddr_in *sinp;
235 
236 	inp = sotoinpcb(so);
237 	KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL"));
238 	INP_WLOCK(inp);
239 	if (inp->inp_flags & INP_DROPPED) {
240 		INP_WUNLOCK(inp);
241 		return (EINVAL);
242 	}
243 	tp = intotcpcb(inp);
244 
245 	sinp = (struct sockaddr_in *)nam;
246 	if (nam->sa_family != AF_INET) {
247 		/*
248 		 * Preserve compatibility with old programs.
249 		 */
250 		if (nam->sa_family != AF_UNSPEC ||
251 		    nam->sa_len < offsetof(struct sockaddr_in, sin_zero) ||
252 		    sinp->sin_addr.s_addr != INADDR_ANY) {
253 			error = EAFNOSUPPORT;
254 			goto out;
255 		}
256 		nam->sa_family = AF_INET;
257 	}
258 	if (nam->sa_len != sizeof(*sinp)) {
259 		error = EINVAL;
260 		goto out;
261 	}
262 	/*
263 	 * Must check for multicast addresses and disallow binding
264 	 * to them.
265 	 */
266 	if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
267 		error = EAFNOSUPPORT;
268 		goto out;
269 	}
270 	INP_HASH_WLOCK(&V_tcbinfo);
271 	error = in_pcbbind(inp, sinp, td->td_ucred);
272 	INP_HASH_WUNLOCK(&V_tcbinfo);
273 out:
274 	tcp_bblog_pru(tp, PRU_BIND, error);
275 	TCP_PROBE2(debug__user, tp, PRU_BIND);
276 	INP_WUNLOCK(inp);
277 
278 	return (error);
279 }
280 #endif /* INET */
281 
282 #ifdef INET6
283 static int
284 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
285 {
286 	int error = 0;
287 	struct inpcb *inp;
288 	struct tcpcb *tp;
289 	struct sockaddr_in6 *sin6;
290 	u_char vflagsav;
291 
292 	inp = sotoinpcb(so);
293 	KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL"));
294 	INP_WLOCK(inp);
295 	if (inp->inp_flags & INP_DROPPED) {
296 		INP_WUNLOCK(inp);
297 		return (EINVAL);
298 	}
299 	tp = intotcpcb(inp);
300 
301 	vflagsav = inp->inp_vflag;
302 
303 	sin6 = (struct sockaddr_in6 *)nam;
304 	if (nam->sa_family != AF_INET6) {
305 		error = EAFNOSUPPORT;
306 		goto out;
307 	}
308 	if (nam->sa_len != sizeof(*sin6)) {
309 		error = EINVAL;
310 		goto out;
311 	}
312 	/*
313 	 * Must check for multicast addresses and disallow binding
314 	 * to them.
315 	 */
316 	if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
317 		error = EAFNOSUPPORT;
318 		goto out;
319 	}
320 
321 	INP_HASH_WLOCK(&V_tcbinfo);
322 	inp->inp_vflag &= ~INP_IPV4;
323 	inp->inp_vflag |= INP_IPV6;
324 #ifdef INET
325 	if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
326 		if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
327 			inp->inp_vflag |= INP_IPV4;
328 		else if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
329 			struct sockaddr_in sin;
330 
331 			in6_sin6_2_sin(&sin, sin6);
332 			if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
333 				error = EAFNOSUPPORT;
334 				INP_HASH_WUNLOCK(&V_tcbinfo);
335 				goto out;
336 			}
337 			inp->inp_vflag |= INP_IPV4;
338 			inp->inp_vflag &= ~INP_IPV6;
339 			error = in_pcbbind(inp, &sin, td->td_ucred);
340 			INP_HASH_WUNLOCK(&V_tcbinfo);
341 			goto out;
342 		}
343 	}
344 #endif
345 	error = in6_pcbbind(inp, sin6, td->td_ucred);
346 	INP_HASH_WUNLOCK(&V_tcbinfo);
347 out:
348 	if (error != 0)
349 		inp->inp_vflag = vflagsav;
350 	tcp_bblog_pru(tp, PRU_BIND, error);
351 	TCP_PROBE2(debug__user, tp, PRU_BIND);
352 	INP_WUNLOCK(inp);
353 	return (error);
354 }
355 #endif /* INET6 */
356 
357 #ifdef INET
358 /*
359  * Prepare to accept connections.
360  */
361 static int
362 tcp_usr_listen(struct socket *so, int backlog, struct thread *td)
363 {
364 	int error = 0;
365 	struct inpcb *inp;
366 	struct tcpcb *tp;
367 
368 	inp = sotoinpcb(so);
369 	KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL"));
370 	INP_WLOCK(inp);
371 	if (inp->inp_flags & INP_DROPPED) {
372 		INP_WUNLOCK(inp);
373 		return (EINVAL);
374 	}
375 	tp = intotcpcb(inp);
376 
377 	SOCK_LOCK(so);
378 	error = solisten_proto_check(so);
379 	if (error != 0) {
380 		SOCK_UNLOCK(so);
381 		goto out;
382 	}
383 	if (inp->inp_lport == 0) {
384 		INP_HASH_WLOCK(&V_tcbinfo);
385 		error = in_pcbbind(inp, NULL, td->td_ucred);
386 		INP_HASH_WUNLOCK(&V_tcbinfo);
387 	}
388 	if (error == 0) {
389 		tcp_state_change(tp, TCPS_LISTEN);
390 		solisten_proto(so, backlog);
391 #ifdef TCP_OFFLOAD
392 		if ((so->so_options & SO_NO_OFFLOAD) == 0)
393 			tcp_offload_listen_start(tp);
394 #endif
395 	} else {
396 		solisten_proto_abort(so);
397 	}
398 	SOCK_UNLOCK(so);
399 
400 	if (IS_FASTOPEN(tp->t_flags))
401 		tp->t_tfo_pending = tcp_fastopen_alloc_counter();
402 
403 out:
404 	tcp_bblog_pru(tp, PRU_LISTEN, error);
405 	TCP_PROBE2(debug__user, tp, PRU_LISTEN);
406 	INP_WUNLOCK(inp);
407 	return (error);
408 }
409 #endif /* INET */
410 
411 #ifdef INET6
412 static int
413 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td)
414 {
415 	int error = 0;
416 	struct inpcb *inp;
417 	struct tcpcb *tp;
418 	u_char vflagsav;
419 
420 	inp = sotoinpcb(so);
421 	KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL"));
422 	INP_WLOCK(inp);
423 	if (inp->inp_flags & INP_DROPPED) {
424 		INP_WUNLOCK(inp);
425 		return (EINVAL);
426 	}
427 	tp = intotcpcb(inp);
428 
429 	vflagsav = inp->inp_vflag;
430 
431 	SOCK_LOCK(so);
432 	error = solisten_proto_check(so);
433 	if (error != 0) {
434 		SOCK_UNLOCK(so);
435 		goto out;
436 	}
437 	INP_HASH_WLOCK(&V_tcbinfo);
438 	if (inp->inp_lport == 0) {
439 		inp->inp_vflag &= ~INP_IPV4;
440 		if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
441 			inp->inp_vflag |= INP_IPV4;
442 		error = in6_pcbbind(inp, NULL, td->td_ucred);
443 	}
444 	INP_HASH_WUNLOCK(&V_tcbinfo);
445 	if (error == 0) {
446 		tcp_state_change(tp, TCPS_LISTEN);
447 		solisten_proto(so, backlog);
448 #ifdef TCP_OFFLOAD
449 		if ((so->so_options & SO_NO_OFFLOAD) == 0)
450 			tcp_offload_listen_start(tp);
451 #endif
452 	} else {
453 		solisten_proto_abort(so);
454 	}
455 	SOCK_UNLOCK(so);
456 
457 	if (IS_FASTOPEN(tp->t_flags))
458 		tp->t_tfo_pending = tcp_fastopen_alloc_counter();
459 
460 	if (error != 0)
461 		inp->inp_vflag = vflagsav;
462 
463 out:
464 	tcp_bblog_pru(tp, PRU_LISTEN, error);
465 	TCP_PROBE2(debug__user, tp, PRU_LISTEN);
466 	INP_WUNLOCK(inp);
467 	return (error);
468 }
469 #endif /* INET6 */
470 
471 #ifdef INET
472 /*
473  * Initiate connection to peer.
474  * Create a template for use in transmissions on this connection.
475  * Enter SYN_SENT state, and mark socket as connecting.
476  * Start keep-alive timer, and seed output sequence space.
477  * Send initial segment on connection.
478  */
479 static int
480 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
481 {
482 	struct epoch_tracker et;
483 	int error = 0;
484 	struct inpcb *inp;
485 	struct tcpcb *tp;
486 	struct sockaddr_in *sinp;
487 
488 	inp = sotoinpcb(so);
489 	KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL"));
490 	INP_WLOCK(inp);
491 	if (inp->inp_flags & INP_DROPPED) {
492 		INP_WUNLOCK(inp);
493 		return (ECONNREFUSED);
494 	}
495 	tp = intotcpcb(inp);
496 
497 	sinp = (struct sockaddr_in *)nam;
498 	if (nam->sa_family != AF_INET) {
499 		error = EAFNOSUPPORT;
500 		goto out;
501 	}
502 	if (nam->sa_len != sizeof (*sinp)) {
503 		error = EINVAL;
504 		goto out;
505 	}
506 	/*
507 	 * Must disallow TCP ``connections'' to multicast addresses.
508 	 */
509 	if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
510 		error = EAFNOSUPPORT;
511 		goto out;
512 	}
513 	if (ntohl(sinp->sin_addr.s_addr) == INADDR_BROADCAST) {
514 		error = EACCES;
515 		goto out;
516 	}
517 	if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0)
518 		goto out;
519 	if (SOLISTENING(so)) {
520 		error = EOPNOTSUPP;
521 		goto out;
522 	}
523 	NET_EPOCH_ENTER(et);
524 	if ((error = tcp_connect(tp, sinp, td)) != 0)
525 		goto out_in_epoch;
526 #ifdef TCP_OFFLOAD
527 	if (registered_toedevs > 0 &&
528 	    (so->so_options & SO_NO_OFFLOAD) == 0 &&
529 	    (error = tcp_offload_connect(so, nam)) == 0)
530 		goto out_in_epoch;
531 #endif
532 	tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp));
533 	error = tcp_output(tp);
534 	KASSERT(error >= 0, ("TCP stack %s requested tcp_drop(%p) at connect()"
535 	    ", error code %d", tp->t_fb->tfb_tcp_block_name, tp, -error));
536 out_in_epoch:
537 	NET_EPOCH_EXIT(et);
538 out:
539 	tcp_bblog_pru(tp, PRU_CONNECT, error);
540 	TCP_PROBE2(debug__user, tp, PRU_CONNECT);
541 	INP_WUNLOCK(inp);
542 	return (error);
543 }
544 #endif /* INET */
545 
546 #ifdef INET6
547 static int
548 tcp6_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;
554 	struct sockaddr_in6 *sin6;
555 	u_int8_t incflagsav;
556 	u_char vflagsav;
557 
558 	inp = sotoinpcb(so);
559 	KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL"));
560 	INP_WLOCK(inp);
561 	if (inp->inp_flags & INP_DROPPED) {
562 		INP_WUNLOCK(inp);
563 		return (ECONNREFUSED);
564 	}
565 	tp = intotcpcb(inp);
566 
567 	vflagsav = inp->inp_vflag;
568 	incflagsav = inp->inp_inc.inc_flags;
569 
570 	sin6 = (struct sockaddr_in6 *)nam;
571 	if (nam->sa_family != AF_INET6) {
572 		error = EAFNOSUPPORT;
573 		goto out;
574 	}
575 	if (nam->sa_len != sizeof (*sin6)) {
576 		error = EINVAL;
577 		goto out;
578 	}
579 	/*
580 	 * Must disallow TCP ``connections'' to multicast addresses.
581 	 */
582 	if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
583 		error = EAFNOSUPPORT;
584 		goto out;
585 	}
586 	if (SOLISTENING(so)) {
587 		error = EINVAL;
588 		goto out;
589 	}
590 #ifdef INET
591 	/*
592 	 * XXXRW: Some confusion: V4/V6 flags relate to binding, and
593 	 * therefore probably require the hash lock, which isn't held here.
594 	 * Is this a significant problem?
595 	 */
596 	if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
597 		struct sockaddr_in sin;
598 
599 		if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
600 			error = EINVAL;
601 			goto out;
602 		}
603 		if ((inp->inp_vflag & INP_IPV4) == 0) {
604 			error = EAFNOSUPPORT;
605 			goto out;
606 		}
607 
608 		in6_sin6_2_sin(&sin, sin6);
609 		if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
610 			error = EAFNOSUPPORT;
611 			goto out;
612 		}
613 		if (ntohl(sin.sin_addr.s_addr) == INADDR_BROADCAST) {
614 			error = EACCES;
615 			goto out;
616 		}
617 		if ((error = prison_remote_ip4(td->td_ucred,
618 		    &sin.sin_addr)) != 0)
619 			goto out;
620 		inp->inp_vflag |= INP_IPV4;
621 		inp->inp_vflag &= ~INP_IPV6;
622 		NET_EPOCH_ENTER(et);
623 		if ((error = tcp_connect(tp, &sin, td)) != 0)
624 			goto out_in_epoch;
625 #ifdef TCP_OFFLOAD
626 		if (registered_toedevs > 0 &&
627 		    (so->so_options & SO_NO_OFFLOAD) == 0 &&
628 		    (error = tcp_offload_connect(so, nam)) == 0)
629 			goto out_in_epoch;
630 #endif
631 		error = tcp_output(tp);
632 		goto out_in_epoch;
633 	} else {
634 		if ((inp->inp_vflag & INP_IPV6) == 0) {
635 			error = EAFNOSUPPORT;
636 			goto out;
637 		}
638 	}
639 #endif
640 	if ((error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr)) != 0)
641 		goto out;
642 	inp->inp_vflag &= ~INP_IPV4;
643 	inp->inp_vflag |= INP_IPV6;
644 	inp->inp_inc.inc_flags |= INC_ISIPV6;
645 	NET_EPOCH_ENTER(et);
646 	if ((error = tcp6_connect(tp, sin6, td)) != 0)
647 		goto out_in_epoch;
648 #ifdef TCP_OFFLOAD
649 	if (registered_toedevs > 0 &&
650 	    (so->so_options & SO_NO_OFFLOAD) == 0 &&
651 	    (error = tcp_offload_connect(so, nam)) == 0)
652 		goto out_in_epoch;
653 #endif
654 	tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp));
655 	error = tcp_output(tp);
656 out_in_epoch:
657 	NET_EPOCH_EXIT(et);
658 out:
659 	KASSERT(error >= 0, ("TCP stack %s requested tcp_drop(%p) at connect()"
660 	    ", error code %d", tp->t_fb->tfb_tcp_block_name, tp, -error));
661 	/*
662 	 * If the implicit bind in the connect call fails, restore
663 	 * the flags we modified.
664 	 */
665 	if (error != 0 && inp->inp_lport == 0) {
666 		inp->inp_vflag = vflagsav;
667 		inp->inp_inc.inc_flags = incflagsav;
668 	}
669 
670 	tcp_bblog_pru(tp, PRU_CONNECT, error);
671 	TCP_PROBE2(debug__user, tp, PRU_CONNECT);
672 	INP_WUNLOCK(inp);
673 	return (error);
674 }
675 #endif /* INET6 */
676 
677 /*
678  * Initiate disconnect from peer.
679  * If connection never passed embryonic stage, just drop;
680  * else if don't need to let data drain, then can just drop anyways,
681  * else have to begin TCP shutdown process: mark socket disconnecting,
682  * drain unread data, state switch to reflect user close, and
683  * send segment (e.g. FIN) to peer.  Socket will be really disconnected
684  * when peer sends FIN and acks ours.
685  *
686  * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
687  */
688 static int
689 tcp_usr_disconnect(struct socket *so)
690 {
691 	struct inpcb *inp;
692 	struct tcpcb *tp = NULL;
693 	struct epoch_tracker et;
694 	int error = 0;
695 
696 	NET_EPOCH_ENTER(et);
697 	inp = sotoinpcb(so);
698 	KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL"));
699 	INP_WLOCK(inp);
700 	if (inp->inp_flags & INP_DROPPED) {
701 		INP_WUNLOCK(inp);
702 		NET_EPOCH_EXIT(et);
703 		return (ECONNRESET);
704 	}
705 	tp = intotcpcb(inp);
706 
707 	if (tp->t_state == TCPS_TIME_WAIT)
708 		goto out;
709 	tcp_disconnect(tp);
710 out:
711 	tcp_bblog_pru(tp, PRU_DISCONNECT, error);
712 	TCP_PROBE2(debug__user, tp, PRU_DISCONNECT);
713 	INP_WUNLOCK(inp);
714 	NET_EPOCH_EXIT(et);
715 	return (error);
716 }
717 
718 #ifdef INET
719 /*
720  * Accept a connection.  Essentially all the work is done at higher levels;
721  * just return the address of the peer, storing through addr.
722  */
723 static int
724 tcp_usr_accept(struct socket *so, struct sockaddr *sa)
725 {
726 	struct inpcb *inp;
727 	struct tcpcb *tp;
728 	int error = 0;
729 
730 	inp = sotoinpcb(so);
731 	KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL"));
732 	INP_WLOCK(inp);
733 	if (inp->inp_flags & INP_DROPPED) {
734 		INP_WUNLOCK(inp);
735 		return (ECONNABORTED);
736 	}
737 	tp = intotcpcb(inp);
738 
739 	if (so->so_state & SS_ISDISCONNECTED)
740 		error = ECONNABORTED;
741 	else
742 		*(struct sockaddr_in *)sa = (struct sockaddr_in ){
743 			.sin_family = AF_INET,
744 			.sin_len = sizeof(struct sockaddr_in),
745 			.sin_port = inp->inp_fport,
746 			.sin_addr = inp->inp_faddr,
747 		};
748 	tcp_bblog_pru(tp, PRU_ACCEPT, error);
749 	TCP_PROBE2(debug__user, tp, PRU_ACCEPT);
750 	INP_WUNLOCK(inp);
751 
752 	return (error);
753 }
754 #endif /* INET */
755 
756 #ifdef INET6
757 static int
758 tcp6_usr_accept(struct socket *so, struct sockaddr *sa)
759 {
760 	struct inpcb *inp;
761 	struct tcpcb *tp;
762 	int error = 0;
763 
764 	inp = sotoinpcb(so);
765 	KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL"));
766 	INP_WLOCK(inp);
767 	if (inp->inp_flags & INP_DROPPED) {
768 		INP_WUNLOCK(inp);
769 		return (ECONNABORTED);
770 	}
771 	tp = intotcpcb(inp);
772 
773 	if (so->so_state & SS_ISDISCONNECTED) {
774 		error = ECONNABORTED;
775 	} else {
776 		if (inp->inp_vflag & INP_IPV4) {
777 			struct sockaddr_in sin = {
778 				.sin_family = AF_INET,
779 				.sin_len = sizeof(struct sockaddr_in),
780 				.sin_port = inp->inp_fport,
781 				.sin_addr = inp->inp_faddr,
782 			};
783 			in6_sin_2_v4mapsin6(&sin, (struct sockaddr_in6 *)sa);
784 		} else {
785 			*(struct sockaddr_in6 *)sa = (struct sockaddr_in6 ){
786 				.sin6_family = AF_INET6,
787 				.sin6_len = sizeof(struct sockaddr_in6),
788 				.sin6_port = inp->inp_fport,
789 				.sin6_addr = inp->in6p_faddr,
790 			};
791 			/* XXX: should catch errors */
792 			(void)sa6_recoverscope((struct sockaddr_in6 *)sa);
793 		}
794 	}
795 
796 	tcp_bblog_pru(tp, PRU_ACCEPT, error);
797 	TCP_PROBE2(debug__user, tp, PRU_ACCEPT);
798 	INP_WUNLOCK(inp);
799 
800 	return (error);
801 }
802 #endif /* INET6 */
803 
804 /*
805  * Mark the connection as being incapable of further output.
806  */
807 static int
808 tcp_usr_shutdown(struct socket *so, enum shutdown_how how)
809 {
810 	struct epoch_tracker et;
811 	struct inpcb *inp = sotoinpcb(so);
812 	struct tcpcb *tp = intotcpcb(inp);
813 	int error = 0;
814 
815 	SOCK_LOCK(so);
816 	if (SOLISTENING(so)) {
817 		if (how != SHUT_WR) {
818 			so->so_error = ECONNABORTED;
819 			solisten_wakeup(so);	/* unlocks so */
820 		} else
821 			SOCK_UNLOCK(so);
822 		return (ENOTCONN);
823 	} else if ((so->so_state &
824 	    (SS_ISCONNECTED | SS_ISCONNECTING | SS_ISDISCONNECTING)) == 0) {
825 		SOCK_UNLOCK(so);
826 		return (ENOTCONN);
827 	}
828 	SOCK_UNLOCK(so);
829 
830 	switch (how) {
831 	case SHUT_RD:
832 		sorflush(so);
833 		break;
834 	case SHUT_RDWR:
835 		sorflush(so);
836 		/* FALLTHROUGH */
837 	case SHUT_WR:
838 		/*
839 		 * XXXGL: mimicing old soshutdown() here. But shouldn't we
840 		 * return ECONNRESEST for SHUT_RD as well?
841 		 */
842 		INP_WLOCK(inp);
843 		if (inp->inp_flags & INP_DROPPED) {
844 			INP_WUNLOCK(inp);
845 			return (ECONNRESET);
846 		}
847 
848 		socantsendmore(so);
849 		NET_EPOCH_ENTER(et);
850 		tcp_usrclosed(tp);
851 		error = tcp_output_nodrop(tp);
852 		tcp_bblog_pru(tp, PRU_SHUTDOWN, error);
853 		TCP_PROBE2(debug__user, tp, PRU_SHUTDOWN);
854 		error = tcp_unlock_or_drop(tp, error);
855 		NET_EPOCH_EXIT(et);
856 	}
857 	wakeup(&so->so_timeo);
858 
859 	return (error);
860 }
861 
862 /*
863  * After a receive, possibly send window update to peer.
864  */
865 static int
866 tcp_usr_rcvd(struct socket *so, int flags)
867 {
868 	struct epoch_tracker et;
869 	struct inpcb *inp;
870 	struct tcpcb *tp;
871 	int outrv = 0, error = 0;
872 
873 	inp = sotoinpcb(so);
874 	KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL"));
875 	INP_WLOCK(inp);
876 	if (inp->inp_flags & INP_DROPPED) {
877 		INP_WUNLOCK(inp);
878 		return (ECONNRESET);
879 	}
880 	tp = intotcpcb(inp);
881 
882 	NET_EPOCH_ENTER(et);
883 	/*
884 	 * For passively-created TFO connections, don't attempt a window
885 	 * update while still in SYN_RECEIVED as this may trigger an early
886 	 * SYN|ACK.  It is preferable to have the SYN|ACK be sent along with
887 	 * application response data, or failing that, when the DELACK timer
888 	 * expires.
889 	 */
890 	if (IS_FASTOPEN(tp->t_flags) &&
891 	    (tp->t_state == TCPS_SYN_RECEIVED))
892 		goto out;
893 #ifdef TCP_OFFLOAD
894 	if (tp->t_flags & TF_TOE)
895 		tcp_offload_rcvd(tp);
896 	else
897 #endif
898 		outrv = tcp_output_nodrop(tp);
899 out:
900 	tcp_bblog_pru(tp, PRU_RCVD, error);
901 	TCP_PROBE2(debug__user, tp, PRU_RCVD);
902 	(void) tcp_unlock_or_drop(tp, outrv);
903 	NET_EPOCH_EXIT(et);
904 	return (error);
905 }
906 
907 /*
908  * Do a send by putting data in output queue and updating urgent
909  * marker if URG set.  Possibly send more data.  Unlike the other
910  * pru_*() routines, the mbuf chains are our responsibility.  We
911  * must either enqueue them or free them.  The other pru_* routines
912  * generally are caller-frees.
913  */
914 static int
915 tcp_usr_send(struct socket *so, int flags, struct mbuf *m,
916     struct sockaddr *nam, struct mbuf *control, struct thread *td)
917 {
918 	struct epoch_tracker et;
919 	int error = 0;
920 	struct inpcb *inp;
921 	struct tcpcb *tp;
922 #ifdef INET
923 #ifdef INET6
924 	struct sockaddr_in sin;
925 #endif
926 	struct sockaddr_in *sinp;
927 #endif
928 #ifdef INET6
929 	struct sockaddr_in6 *sin6;
930 	int isipv6;
931 #endif
932 	u_int8_t incflagsav;
933 	u_char vflagsav;
934 	bool restoreflags;
935 
936 	inp = sotoinpcb(so);
937 	KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL"));
938 	INP_WLOCK(inp);
939 	if (inp->inp_flags & INP_DROPPED) {
940 		if (m != NULL && (flags & PRUS_NOTREADY) == 0)
941 			m_freem(m);
942 		INP_WUNLOCK(inp);
943 		return (ECONNRESET);
944 	}
945 	tp = intotcpcb(inp);
946 
947 	vflagsav = inp->inp_vflag;
948 	incflagsav = inp->inp_inc.inc_flags;
949 	restoreflags = false;
950 
951 	NET_EPOCH_ENTER(et);
952 	if (control != NULL) {
953 		/* TCP doesn't do control messages (rights, creds, etc) */
954 		if (control->m_len > 0) {
955 			m_freem(control);
956 			error = EINVAL;
957 			goto out;
958 		}
959 		m_freem(control);	/* empty control, just free it */
960 	}
961 
962 	if ((flags & PRUS_OOB) != 0 &&
963 	    (error = tcp_pru_options_support(tp, PRUS_OOB)) != 0)
964 		goto out;
965 
966 	if (nam != NULL && tp->t_state < TCPS_SYN_SENT) {
967 		if (tp->t_state == TCPS_LISTEN) {
968 			error = EINVAL;
969 			goto out;
970 		}
971 		switch (nam->sa_family) {
972 #ifdef INET
973 		case AF_INET:
974 			sinp = (struct sockaddr_in *)nam;
975 			if (sinp->sin_len != sizeof(struct sockaddr_in)) {
976 				error = EINVAL;
977 				goto out;
978 			}
979 			if ((inp->inp_vflag & INP_IPV6) != 0) {
980 				error = EAFNOSUPPORT;
981 				goto out;
982 			}
983 			if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
984 				error = EAFNOSUPPORT;
985 				goto out;
986 			}
987 			if (ntohl(sinp->sin_addr.s_addr) == INADDR_BROADCAST) {
988 				error = EACCES;
989 				goto out;
990 			}
991 			if ((error = prison_remote_ip4(td->td_ucred,
992 			    &sinp->sin_addr)))
993 				goto out;
994 #ifdef INET6
995 			isipv6 = 0;
996 #endif
997 			break;
998 #endif /* INET */
999 #ifdef INET6
1000 		case AF_INET6:
1001 			sin6 = (struct sockaddr_in6 *)nam;
1002 			if (sin6->sin6_len != sizeof(*sin6)) {
1003 				error = EINVAL;
1004 				goto out;
1005 			}
1006 			if ((inp->inp_vflag & INP_IPV6PROTO) == 0) {
1007 				error = EAFNOSUPPORT;
1008 				goto out;
1009 			}
1010 			if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
1011 				error = EAFNOSUPPORT;
1012 				goto out;
1013 			}
1014 			if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
1015 #ifdef INET
1016 				if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
1017 					error = EINVAL;
1018 					goto out;
1019 				}
1020 				if ((inp->inp_vflag & INP_IPV4) == 0) {
1021 					error = EAFNOSUPPORT;
1022 					goto out;
1023 				}
1024 				restoreflags = true;
1025 				inp->inp_vflag &= ~INP_IPV6;
1026 				sinp = &sin;
1027 				in6_sin6_2_sin(sinp, sin6);
1028 				if (IN_MULTICAST(
1029 				    ntohl(sinp->sin_addr.s_addr))) {
1030 					error = EAFNOSUPPORT;
1031 					goto out;
1032 				}
1033 				if ((error = prison_remote_ip4(td->td_ucred,
1034 				    &sinp->sin_addr)))
1035 					goto out;
1036 				isipv6 = 0;
1037 #else /* !INET */
1038 				error = EAFNOSUPPORT;
1039 				goto out;
1040 #endif /* INET */
1041 			} else {
1042 				if ((inp->inp_vflag & INP_IPV6) == 0) {
1043 					error = EAFNOSUPPORT;
1044 					goto out;
1045 				}
1046 				restoreflags = true;
1047 				inp->inp_vflag &= ~INP_IPV4;
1048 				inp->inp_inc.inc_flags |= INC_ISIPV6;
1049 				if ((error = prison_remote_ip6(td->td_ucred,
1050 				    &sin6->sin6_addr)))
1051 					goto out;
1052 				isipv6 = 1;
1053 			}
1054 			break;
1055 #endif /* INET6 */
1056 		default:
1057 			error = EAFNOSUPPORT;
1058 			goto out;
1059 		}
1060 	}
1061 	if (!(flags & PRUS_OOB)) {
1062 		if (tp->t_acktime == 0)
1063 			tp->t_acktime = ticks;
1064 		sbappendstream(&so->so_snd, m, flags);
1065 		m = NULL;
1066 		if (nam && tp->t_state < TCPS_SYN_SENT) {
1067 			KASSERT(tp->t_state == TCPS_CLOSED,
1068 			    ("%s: tp %p is listening", __func__, tp));
1069 
1070 			/*
1071 			 * Do implied connect if not yet connected,
1072 			 * initialize window to default value, and
1073 			 * initialize maxseg using peer's cached MSS.
1074 			 */
1075 #ifdef INET6
1076 			if (isipv6)
1077 				error = tcp6_connect(tp, sin6, td);
1078 #endif /* INET6 */
1079 #if defined(INET6) && defined(INET)
1080 			else
1081 #endif
1082 #ifdef INET
1083 				error = tcp_connect(tp, sinp, td);
1084 #endif
1085 			/*
1086 			 * The bind operation in tcp_connect succeeded. We
1087 			 * no longer want to restore the flags if later
1088 			 * operations fail.
1089 			 */
1090 			if (error == 0 || inp->inp_lport != 0)
1091 				restoreflags = false;
1092 
1093 			if (error) {
1094 				/* m is freed if PRUS_NOTREADY is unset. */
1095 				sbflush(&so->so_snd);
1096 				goto out;
1097 			}
1098 			if (IS_FASTOPEN(tp->t_flags))
1099 				tcp_fastopen_connect(tp);
1100 			else {
1101 				tp->snd_wnd = TTCP_CLIENT_SND_WND;
1102 				tcp_mss(tp, -1);
1103 			}
1104 		}
1105 		if (flags & PRUS_EOF) {
1106 			/*
1107 			 * Close the send side of the connection after
1108 			 * the data is sent.
1109 			 */
1110 			socantsendmore(so);
1111 			tcp_usrclosed(tp);
1112 		}
1113 		if (TCPS_HAVEESTABLISHED(tp->t_state) &&
1114 		    ((tp->t_flags2 & TF2_FBYTES_COMPLETE) == 0) &&
1115 		    (tp->t_fbyte_out == 0) &&
1116 		    (so->so_snd.sb_ccc > 0)) {
1117 			tp->t_fbyte_out = ticks;
1118 			if (tp->t_fbyte_out == 0)
1119 				tp->t_fbyte_out = 1;
1120 			if (tp->t_fbyte_out && tp->t_fbyte_in)
1121 				tp->t_flags2 |= TF2_FBYTES_COMPLETE;
1122 		}
1123 		if (!(inp->inp_flags & INP_DROPPED) &&
1124 		    !(flags & PRUS_NOTREADY)) {
1125 			if (flags & PRUS_MORETOCOME)
1126 				tp->t_flags |= TF_MORETOCOME;
1127 			error = tcp_output_nodrop(tp);
1128 			if (flags & PRUS_MORETOCOME)
1129 				tp->t_flags &= ~TF_MORETOCOME;
1130 		}
1131 	} else {
1132 		/*
1133 		 * XXXRW: PRUS_EOF not implemented with PRUS_OOB?
1134 		 */
1135 		SOCKBUF_LOCK(&so->so_snd);
1136 		if (sbspace(&so->so_snd) < -512) {
1137 			SOCKBUF_UNLOCK(&so->so_snd);
1138 			error = ENOBUFS;
1139 			goto out;
1140 		}
1141 		/*
1142 		 * According to RFC961 (Assigned Protocols),
1143 		 * the urgent pointer points to the last octet
1144 		 * of urgent data.  We continue, however,
1145 		 * to consider it to indicate the first octet
1146 		 * of data past the urgent section.
1147 		 * Otherwise, snd_up should be one lower.
1148 		 */
1149 		if (tp->t_acktime == 0)
1150 			tp->t_acktime = ticks;
1151 		sbappendstream_locked(&so->so_snd, m, flags);
1152 		SOCKBUF_UNLOCK(&so->so_snd);
1153 		m = NULL;
1154 		if (nam && tp->t_state < TCPS_SYN_SENT) {
1155 			/*
1156 			 * Do implied connect if not yet connected,
1157 			 * initialize window to default value, and
1158 			 * initialize maxseg using peer's cached MSS.
1159 			 */
1160 
1161 			/*
1162 			 * Not going to contemplate SYN|URG
1163 			 */
1164 			if (IS_FASTOPEN(tp->t_flags))
1165 				tp->t_flags &= ~TF_FASTOPEN;
1166 #ifdef INET6
1167 			if (isipv6)
1168 				error = tcp6_connect(tp, sin6, td);
1169 #endif /* INET6 */
1170 #if defined(INET6) && defined(INET)
1171 			else
1172 #endif
1173 #ifdef INET
1174 				error = tcp_connect(tp, sinp, td);
1175 #endif
1176 			/*
1177 			 * The bind operation in tcp_connect succeeded. We
1178 			 * no longer want to restore the flags if later
1179 			 * operations fail.
1180 			 */
1181 			if (error == 0 || inp->inp_lport != 0)
1182 				restoreflags = false;
1183 
1184 			if (error != 0) {
1185 				/* m is freed if PRUS_NOTREADY is unset. */
1186 				sbflush(&so->so_snd);
1187 				goto out;
1188 			}
1189 			tp->snd_wnd = TTCP_CLIENT_SND_WND;
1190 			tcp_mss(tp, -1);
1191 		}
1192 		tp->snd_up = tp->snd_una + sbavail(&so->so_snd);
1193 		if ((flags & PRUS_NOTREADY) == 0) {
1194 			tp->t_flags |= TF_FORCEDATA;
1195 			error = tcp_output_nodrop(tp);
1196 			tp->t_flags &= ~TF_FORCEDATA;
1197 		}
1198 	}
1199 	TCP_LOG_EVENT(tp, NULL,
1200 	    &inp->inp_socket->so_rcv,
1201 	    &inp->inp_socket->so_snd,
1202 	    TCP_LOG_USERSEND, error,
1203 	    0, NULL, false);
1204 
1205 out:
1206 	/*
1207 	 * In case of PRUS_NOTREADY, the caller or tcp_usr_ready() is
1208 	 * responsible for freeing memory.
1209 	 */
1210 	if (m != NULL && (flags & PRUS_NOTREADY) == 0)
1211 		m_freem(m);
1212 
1213 	/*
1214 	 * If the request was unsuccessful and we changed flags,
1215 	 * restore the original flags.
1216 	 */
1217 	if (error != 0 && restoreflags) {
1218 		inp->inp_vflag = vflagsav;
1219 		inp->inp_inc.inc_flags = incflagsav;
1220 	}
1221 	tcp_bblog_pru(tp, (flags & PRUS_OOB) ? PRU_SENDOOB :
1222 		      ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND), error);
1223 	TCP_PROBE2(debug__user, tp, (flags & PRUS_OOB) ? PRU_SENDOOB :
1224 		   ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
1225 	error = tcp_unlock_or_drop(tp, error);
1226 	NET_EPOCH_EXIT(et);
1227 	return (error);
1228 }
1229 
1230 static int
1231 tcp_usr_ready(struct socket *so, struct mbuf *m, int count)
1232 {
1233 	struct epoch_tracker et;
1234 	struct inpcb *inp;
1235 	struct tcpcb *tp;
1236 	int error;
1237 
1238 	inp = sotoinpcb(so);
1239 	INP_WLOCK(inp);
1240 	if (inp->inp_flags & INP_DROPPED) {
1241 		INP_WUNLOCK(inp);
1242 		mb_free_notready(m, count);
1243 		return (ECONNRESET);
1244 	}
1245 	tp = intotcpcb(inp);
1246 
1247 	SOCKBUF_LOCK(&so->so_snd);
1248 	error = sbready(&so->so_snd, m, count);
1249 	SOCKBUF_UNLOCK(&so->so_snd);
1250 	if (error) {
1251 		INP_WUNLOCK(inp);
1252 		return (error);
1253 	}
1254 	NET_EPOCH_ENTER(et);
1255 	error = tcp_output_unlock(tp);
1256 	NET_EPOCH_EXIT(et);
1257 
1258 	return (error);
1259 }
1260 
1261 /*
1262  * Abort the TCP.  Drop the connection abruptly.
1263  */
1264 static void
1265 tcp_usr_abort(struct socket *so)
1266 {
1267 	struct inpcb *inp;
1268 	struct tcpcb *tp;
1269 	struct epoch_tracker et;
1270 
1271 	inp = sotoinpcb(so);
1272 	KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL"));
1273 
1274 	NET_EPOCH_ENTER(et);
1275 	INP_WLOCK(inp);
1276 	KASSERT(inp->inp_socket != NULL,
1277 	    ("tcp_usr_abort: inp_socket == NULL"));
1278 
1279 	/*
1280 	 * If we still have full TCP state, and we're not dropped, drop.
1281 	 */
1282 	if (!(inp->inp_flags & INP_DROPPED)) {
1283 		tp = intotcpcb(inp);
1284 		tp = tcp_drop(tp, ECONNABORTED);
1285 		if (tp == NULL)
1286 			goto dropped;
1287 		tcp_bblog_pru(tp, PRU_ABORT, 0);
1288 		TCP_PROBE2(debug__user, tp, PRU_ABORT);
1289 	}
1290 	if (!(inp->inp_flags & INP_DROPPED)) {
1291 		soref(so);
1292 		inp->inp_flags |= INP_SOCKREF;
1293 	}
1294 	INP_WUNLOCK(inp);
1295 dropped:
1296 	NET_EPOCH_EXIT(et);
1297 }
1298 
1299 /*
1300  * TCP socket is closed.  Start friendly disconnect.
1301  */
1302 static void
1303 tcp_usr_close(struct socket *so)
1304 {
1305 	struct inpcb *inp;
1306 	struct tcpcb *tp;
1307 	struct epoch_tracker et;
1308 
1309 	inp = sotoinpcb(so);
1310 	KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL"));
1311 
1312 	NET_EPOCH_ENTER(et);
1313 	INP_WLOCK(inp);
1314 	KASSERT(inp->inp_socket != NULL,
1315 	    ("tcp_usr_close: inp_socket == NULL"));
1316 
1317 	/*
1318 	 * If we are still connected and we're not dropped, initiate
1319 	 * a disconnect.
1320 	 */
1321 	if (!(inp->inp_flags & INP_DROPPED)) {
1322 		tp = intotcpcb(inp);
1323 		if (tp->t_state != TCPS_TIME_WAIT) {
1324 			tp->t_flags |= TF_CLOSED;
1325 			tcp_disconnect(tp);
1326 			tcp_bblog_pru(tp, PRU_CLOSE, 0);
1327 			TCP_PROBE2(debug__user, tp, PRU_CLOSE);
1328 		}
1329 	}
1330 	if (!(inp->inp_flags & INP_DROPPED)) {
1331 		soref(so);
1332 		inp->inp_flags |= INP_SOCKREF;
1333 	}
1334 	INP_WUNLOCK(inp);
1335 	NET_EPOCH_EXIT(et);
1336 }
1337 
1338 static int
1339 tcp_pru_options_support(struct tcpcb *tp, int flags)
1340 {
1341 	/*
1342 	 * If the specific TCP stack has a pru_options
1343 	 * specified then it does not always support
1344 	 * all the PRU_XX options and we must ask it.
1345 	 * If the function is not specified then all
1346 	 * of the PRU_XX options are supported.
1347 	 */
1348 	int ret = 0;
1349 
1350 	if (tp->t_fb->tfb_pru_options) {
1351 		ret = (*tp->t_fb->tfb_pru_options)(tp, flags);
1352 	}
1353 	return (ret);
1354 }
1355 
1356 /*
1357  * Receive out-of-band data.
1358  */
1359 static int
1360 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags)
1361 {
1362 	int error = 0;
1363 	struct inpcb *inp;
1364 	struct tcpcb *tp;
1365 
1366 	inp = sotoinpcb(so);
1367 	KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL"));
1368 	INP_WLOCK(inp);
1369 	if (inp->inp_flags & INP_DROPPED) {
1370 		INP_WUNLOCK(inp);
1371 		return (ECONNRESET);
1372 	}
1373 	tp = intotcpcb(inp);
1374 
1375 	error = tcp_pru_options_support(tp, PRUS_OOB);
1376 	if (error) {
1377 		goto out;
1378 	}
1379 	if ((so->so_oobmark == 0 &&
1380 	     (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) ||
1381 	    so->so_options & SO_OOBINLINE ||
1382 	    tp->t_oobflags & TCPOOB_HADDATA) {
1383 		error = EINVAL;
1384 		goto out;
1385 	}
1386 	if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
1387 		error = EWOULDBLOCK;
1388 		goto out;
1389 	}
1390 	m->m_len = 1;
1391 	*mtod(m, caddr_t) = tp->t_iobc;
1392 	if ((flags & MSG_PEEK) == 0)
1393 		tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
1394 
1395 out:
1396 	tcp_bblog_pru(tp, PRU_RCVOOB, error);
1397 	TCP_PROBE2(debug__user, tp, PRU_RCVOOB);
1398 	INP_WUNLOCK(inp);
1399 	return (error);
1400 }
1401 
1402 #ifdef INET
1403 struct protosw tcp_protosw = {
1404 	.pr_type =		SOCK_STREAM,
1405 	.pr_protocol =		IPPROTO_TCP,
1406 	.pr_flags =		PR_CONNREQUIRED | PR_IMPLOPCL | PR_WANTRCVD |
1407 				    PR_CAPATTACH,
1408 	.pr_ctloutput =		tcp_ctloutput,
1409 	.pr_abort =		tcp_usr_abort,
1410 	.pr_accept =		tcp_usr_accept,
1411 	.pr_attach =		tcp_usr_attach,
1412 	.pr_bind =		tcp_usr_bind,
1413 	.pr_connect =		tcp_usr_connect,
1414 	.pr_control =		in_control,
1415 	.pr_detach =		tcp_usr_detach,
1416 	.pr_disconnect =	tcp_usr_disconnect,
1417 	.pr_listen =		tcp_usr_listen,
1418 	.pr_peeraddr =		in_getpeeraddr,
1419 	.pr_rcvd =		tcp_usr_rcvd,
1420 	.pr_rcvoob =		tcp_usr_rcvoob,
1421 	.pr_send =		tcp_usr_send,
1422 	.pr_ready =		tcp_usr_ready,
1423 	.pr_shutdown =		tcp_usr_shutdown,
1424 	.pr_sockaddr =		in_getsockaddr,
1425 	.pr_sosetlabel =	in_pcbsosetlabel,
1426 	.pr_close =		tcp_usr_close,
1427 };
1428 #endif /* INET */
1429 
1430 #ifdef INET6
1431 struct protosw tcp6_protosw = {
1432 	.pr_type =		SOCK_STREAM,
1433 	.pr_protocol =		IPPROTO_TCP,
1434 	.pr_flags =		PR_CONNREQUIRED | PR_IMPLOPCL |PR_WANTRCVD |
1435 				    PR_CAPATTACH,
1436 	.pr_ctloutput =		tcp_ctloutput,
1437 	.pr_abort =		tcp_usr_abort,
1438 	.pr_accept =		tcp6_usr_accept,
1439 	.pr_attach =		tcp_usr_attach,
1440 	.pr_bind =		tcp6_usr_bind,
1441 	.pr_connect =		tcp6_usr_connect,
1442 	.pr_control =		in6_control,
1443 	.pr_detach =		tcp_usr_detach,
1444 	.pr_disconnect =	tcp_usr_disconnect,
1445 	.pr_listen =		tcp6_usr_listen,
1446 	.pr_peeraddr =		in6_mapped_peeraddr,
1447 	.pr_rcvd =		tcp_usr_rcvd,
1448 	.pr_rcvoob =		tcp_usr_rcvoob,
1449 	.pr_send =		tcp_usr_send,
1450 	.pr_ready =		tcp_usr_ready,
1451 	.pr_shutdown =		tcp_usr_shutdown,
1452 	.pr_sockaddr =		in6_mapped_sockaddr,
1453 	.pr_sosetlabel =	in_pcbsosetlabel,
1454 	.pr_close =		tcp_usr_close,
1455 };
1456 #endif /* INET6 */
1457 
1458 #ifdef INET
1459 /*
1460  * Common subroutine to open a TCP connection to remote host specified
1461  * by struct sockaddr_in.  Call in_pcbconnect() to choose local host address
1462  * and assign a local port number and install the inpcb into the hash.
1463  * Initialize connection parameters and enter SYN-SENT state.
1464  */
1465 static int
1466 tcp_connect(struct tcpcb *tp, struct sockaddr_in *sin, struct thread *td)
1467 {
1468 	struct inpcb *inp = tptoinpcb(tp);
1469 	struct socket *so = tptosocket(tp);
1470 	int error;
1471 
1472 	NET_EPOCH_ASSERT();
1473 	INP_WLOCK_ASSERT(inp);
1474 
1475 	if (__predict_false((so->so_state &
1476 	    (SS_ISCONNECTING | SS_ISCONNECTED | SS_ISDISCONNECTING |
1477 	    SS_ISDISCONNECTED)) != 0))
1478 		return (EISCONN);
1479 
1480 	INP_HASH_WLOCK(&V_tcbinfo);
1481 	error = in_pcbconnect(inp, sin, td->td_ucred, true);
1482 	INP_HASH_WUNLOCK(&V_tcbinfo);
1483 	if (error != 0)
1484 		return (error);
1485 
1486 	/*
1487 	 * Compute window scaling to request:
1488 	 * Scale to fit into sweet spot.  See tcp_syncache.c.
1489 	 * XXX: This should move to tcp_output().
1490 	 */
1491 	while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1492 	    (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1493 		tp->request_r_scale++;
1494 
1495 	soisconnecting(so);
1496 	TCPSTAT_INC(tcps_connattempt);
1497 	tcp_state_change(tp, TCPS_SYN_SENT);
1498 	tp->iss = tcp_new_isn(&inp->inp_inc);
1499 	if (tp->t_flags & TF_REQ_TSTMP)
1500 		tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc);
1501 	tcp_sendseqinit(tp);
1502 
1503 	return (0);
1504 }
1505 #endif /* INET */
1506 
1507 #ifdef INET6
1508 static int
1509 tcp6_connect(struct tcpcb *tp, struct sockaddr_in6 *sin6, struct thread *td)
1510 {
1511 	struct inpcb *inp = tptoinpcb(tp);
1512 	struct socket *so = tptosocket(tp);
1513 	int error;
1514 
1515 	NET_EPOCH_ASSERT();
1516 	INP_WLOCK_ASSERT(inp);
1517 
1518 	if (__predict_false((so->so_state &
1519 	    (SS_ISCONNECTING | SS_ISCONNECTED)) != 0))
1520 		return (EISCONN);
1521 
1522 	INP_HASH_WLOCK(&V_tcbinfo);
1523 	error = in6_pcbconnect(inp, sin6, td->td_ucred, true);
1524 	INP_HASH_WUNLOCK(&V_tcbinfo);
1525 	if (error != 0)
1526 		return (error);
1527 
1528 	/* Compute window scaling to request.  */
1529 	while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1530 	    (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1531 		tp->request_r_scale++;
1532 
1533 	soisconnecting(so);
1534 	TCPSTAT_INC(tcps_connattempt);
1535 	tcp_state_change(tp, TCPS_SYN_SENT);
1536 	tp->iss = tcp_new_isn(&inp->inp_inc);
1537 	if (tp->t_flags & TF_REQ_TSTMP)
1538 		tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc);
1539 	tcp_sendseqinit(tp);
1540 
1541 	return (0);
1542 }
1543 #endif /* INET6 */
1544 
1545 /*
1546  * Export TCP internal state information via a struct tcp_info, based on the
1547  * Linux 2.6 API.  Not ABI compatible as our constants are mapped differently
1548  * (TCP state machine, etc).  We export all information using FreeBSD-native
1549  * constants -- for example, the numeric values for tcpi_state will differ
1550  * from Linux.
1551  */
1552 void
1553 tcp_fill_info(const struct tcpcb *tp, struct tcp_info *ti)
1554 {
1555 
1556 	INP_LOCK_ASSERT(tptoinpcb(tp));
1557 	bzero(ti, sizeof(*ti));
1558 
1559 	ti->tcpi_state = tp->t_state;
1560 	if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP))
1561 		ti->tcpi_options |= TCPI_OPT_TIMESTAMPS;
1562 	if (tp->t_flags & TF_SACK_PERMIT)
1563 		ti->tcpi_options |= TCPI_OPT_SACK;
1564 	if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) {
1565 		ti->tcpi_options |= TCPI_OPT_WSCALE;
1566 		ti->tcpi_snd_wscale = tp->snd_scale;
1567 		ti->tcpi_rcv_wscale = tp->rcv_scale;
1568 	}
1569 	switch (tp->t_flags2 & (TF2_ECN_PERMIT | TF2_ACE_PERMIT)) {
1570 		case TF2_ECN_PERMIT:
1571 			ti->tcpi_options |= TCPI_OPT_ECN;
1572 			break;
1573 		case TF2_ACE_PERMIT:
1574 			/* FALLTHROUGH */
1575 		case TF2_ECN_PERMIT | TF2_ACE_PERMIT:
1576 			ti->tcpi_options |= TCPI_OPT_ACE;
1577 			break;
1578 		default:
1579 			break;
1580 	}
1581 	if (IS_FASTOPEN(tp->t_flags))
1582 		ti->tcpi_options |= TCPI_OPT_TFO;
1583 
1584 	ti->tcpi_rto = tp->t_rxtcur * tick;
1585 	ti->tcpi_last_data_recv = ((uint32_t)ticks - tp->t_rcvtime) * tick;
1586 	ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT;
1587 	ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT;
1588 
1589 	ti->tcpi_snd_ssthresh = tp->snd_ssthresh;
1590 	ti->tcpi_snd_cwnd = tp->snd_cwnd;
1591 
1592 	/*
1593 	 * FreeBSD-specific extension fields for tcp_info.
1594 	 */
1595 	ti->tcpi_rcv_space = tp->rcv_wnd;
1596 	ti->tcpi_rcv_nxt = tp->rcv_nxt;
1597 	ti->tcpi_snd_wnd = tp->snd_wnd;
1598 	ti->tcpi_snd_bwnd = 0;		/* Unused, kept for compat. */
1599 	ti->tcpi_snd_nxt = tp->snd_nxt;
1600 	ti->tcpi_snd_mss = tp->t_maxseg;
1601 	ti->tcpi_rcv_mss = tp->t_maxseg;
1602 	ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack;
1603 	ti->tcpi_rcv_ooopack = tp->t_rcvoopack;
1604 	ti->tcpi_snd_zerowin = tp->t_sndzerowin;
1605 	ti->tcpi_snd_una = tp->snd_una;
1606 	ti->tcpi_snd_max = tp->snd_max;
1607 	ti->tcpi_rcv_numsacks = tp->rcv_numsacks;
1608 	ti->tcpi_rcv_adv = tp->rcv_adv;
1609 	ti->tcpi_dupacks = tp->t_dupacks;
1610 	ti->tcpi_rttmin = tp->t_rttlow;
1611 #ifdef TCP_OFFLOAD
1612 	if (tp->t_flags & TF_TOE) {
1613 		ti->tcpi_options |= TCPI_OPT_TOE;
1614 		tcp_offload_tcp_info(tp, ti);
1615 	}
1616 #endif
1617 	/*
1618 	 * AccECN related counters.
1619 	 */
1620 	if ((tp->t_flags2 & (TF2_ECN_PERMIT | TF2_ACE_PERMIT)) ==
1621 	    (TF2_ECN_PERMIT | TF2_ACE_PERMIT))
1622 		/*
1623 		 * Internal counter starts at 5 for AccECN
1624 		 * but 0 for RFC3168 ECN.
1625 		 */
1626 		ti->tcpi_delivered_ce = tp->t_scep - 5;
1627 	else
1628 		ti->tcpi_delivered_ce = tp->t_scep;
1629 	ti->tcpi_received_ce = tp->t_rcep;
1630 }
1631 
1632 /*
1633  * tcp_ctloutput() must drop the inpcb lock before performing copyin on
1634  * socket option arguments.  When it re-acquires the lock after the copy, it
1635  * has to revalidate that the connection is still valid for the socket
1636  * option.
1637  */
1638 #define INP_WLOCK_RECHECK_CLEANUP(inp, cleanup) do {			\
1639 	INP_WLOCK(inp);							\
1640 	if (inp->inp_flags & INP_DROPPED) {				\
1641 		INP_WUNLOCK(inp);					\
1642 		cleanup;						\
1643 		return (ECONNRESET);					\
1644 	}								\
1645 	tp = intotcpcb(inp);						\
1646 } while(0)
1647 #define INP_WLOCK_RECHECK(inp) INP_WLOCK_RECHECK_CLEANUP((inp), /* noop */)
1648 
1649 int
1650 tcp_ctloutput_set(struct inpcb *inp, struct sockopt *sopt)
1651 {
1652 	struct socket *so = inp->inp_socket;
1653 	struct tcpcb *tp = intotcpcb(inp);
1654 	int error = 0;
1655 
1656 	MPASS(sopt->sopt_dir == SOPT_SET);
1657 	INP_WLOCK_ASSERT(inp);
1658 	KASSERT((inp->inp_flags & INP_DROPPED) == 0,
1659 	    ("inp_flags == %x", inp->inp_flags));
1660 	KASSERT(so != NULL, ("inp_socket == NULL"));
1661 
1662 	if (sopt->sopt_level != IPPROTO_TCP) {
1663 		INP_WUNLOCK(inp);
1664 #ifdef INET6
1665 		if (inp->inp_vflag & INP_IPV6PROTO)
1666 			error = ip6_ctloutput(so, sopt);
1667 #endif
1668 #if defined(INET6) && defined(INET)
1669 		else
1670 #endif
1671 #ifdef INET
1672 			error = ip_ctloutput(so, sopt);
1673 #endif
1674 		/*
1675 		 * When an IP-level socket option affects TCP, pass control
1676 		 * down to stack tfb_tcp_ctloutput, otherwise return what
1677 		 * IP level returned.
1678 		 */
1679 		switch (sopt->sopt_level) {
1680 #ifdef INET6
1681 		case IPPROTO_IPV6:
1682 			if ((inp->inp_vflag & INP_IPV6PROTO) == 0)
1683 				return (error);
1684 			switch (sopt->sopt_name) {
1685 			case IPV6_TCLASS:
1686 				/* Notify tcp stacks that care (e.g. RACK). */
1687 				break;
1688 			case IPV6_USE_MIN_MTU:
1689 				/* Update t_maxseg accordingly. */
1690 				break;
1691 			default:
1692 				return (error);
1693 			}
1694 			break;
1695 #endif
1696 #ifdef INET
1697 		case IPPROTO_IP:
1698 			switch (sopt->sopt_name) {
1699 			case IP_TOS:
1700 				inp->inp_ip_tos &= ~IPTOS_ECN_MASK;
1701 				break;
1702 			case IP_TTL:
1703 				/* Notify tcp stacks that care (e.g. RACK). */
1704 				break;
1705 			default:
1706 				return (error);
1707 			}
1708 			break;
1709 #endif
1710 		default:
1711 			return (error);
1712 		}
1713 		INP_WLOCK(inp);
1714 		if (inp->inp_flags & INP_DROPPED) {
1715 			INP_WUNLOCK(inp);
1716 			return (ECONNRESET);
1717 		}
1718 	} else if (sopt->sopt_name == TCP_FUNCTION_BLK) {
1719 		/*
1720 		 * Protect the TCP option TCP_FUNCTION_BLK so
1721 		 * that a sub-function can *never* overwrite this.
1722 		 */
1723 		struct tcp_function_set fsn;
1724 		struct tcp_function_block *blk;
1725 		void *ptr = NULL;
1726 
1727 		INP_WUNLOCK(inp);
1728 		error = sooptcopyin(sopt, &fsn, sizeof fsn, sizeof fsn);
1729 		if (error)
1730 			return (error);
1731 
1732 		INP_WLOCK(inp);
1733 		tp = intotcpcb(inp);
1734 
1735 		blk = find_and_ref_tcp_functions(&fsn);
1736 		if (blk == NULL) {
1737 			INP_WUNLOCK(inp);
1738 			return (ENOENT);
1739 		}
1740 		if (tp->t_fb == blk) {
1741 			/* You already have this */
1742 			refcount_release(&blk->tfb_refcnt);
1743 			INP_WUNLOCK(inp);
1744 			return (0);
1745 		}
1746 		if (tp->t_state != TCPS_CLOSED) {
1747 			/*
1748 			 * The user has advanced the state
1749 			 * past the initial point, we may not
1750 			 * be able to switch.
1751 			 */
1752 			if (blk->tfb_tcp_handoff_ok != NULL) {
1753 				/*
1754 				 * Does the stack provide a
1755 				 * query mechanism, if so it may
1756 				 * still be possible?
1757 				 */
1758 				error = (*blk->tfb_tcp_handoff_ok)(tp);
1759 			} else
1760 				error = EINVAL;
1761 			if (error) {
1762 				refcount_release(&blk->tfb_refcnt);
1763 				INP_WUNLOCK(inp);
1764 				return(error);
1765 			}
1766 		}
1767 		if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) {
1768 			refcount_release(&blk->tfb_refcnt);
1769 			INP_WUNLOCK(inp);
1770 			return (ENOENT);
1771 		}
1772 		/*
1773 		 * Ensure the new stack takes ownership with a
1774 		 * clean slate on peak rate threshold.
1775 		 */
1776 		if (tp->t_fb->tfb_tcp_timer_stop_all != NULL)
1777 			tp->t_fb->tfb_tcp_timer_stop_all(tp);
1778 		if (blk->tfb_tcp_fb_init) {
1779 			error = (*blk->tfb_tcp_fb_init)(tp, &ptr);
1780 			if (error) {
1781 				/*
1782 				 * Release the ref count the lookup
1783 				 * acquired.
1784 				 */
1785 				refcount_release(&blk->tfb_refcnt);
1786 				/*
1787 				 * Now there is a chance that the
1788 				 * init() function mucked with some
1789 				 * things before it failed, such as
1790 				 * hpts or inp_flags2 or timer granularity.
1791 				 * It should not of, but lets give the old
1792 				 * stack a chance to reset to a known good state.
1793 				 */
1794 				if (tp->t_fb->tfb_switch_failed) {
1795 					(*tp->t_fb->tfb_switch_failed)(tp);
1796 				}
1797 			 	goto err_out;
1798 			}
1799 		}
1800 		if (tp->t_fb->tfb_tcp_fb_fini) {
1801 			struct epoch_tracker et;
1802 			/*
1803 			 * Tell the stack to cleanup with 0 i.e.
1804 			 * the tcb is not going away.
1805 			 */
1806 			NET_EPOCH_ENTER(et);
1807 			(*tp->t_fb->tfb_tcp_fb_fini)(tp, 0);
1808 			NET_EPOCH_EXIT(et);
1809 		}
1810 		/*
1811 		 * Release the old refcnt, the
1812 		 * lookup acquired a ref on the
1813 		 * new one already.
1814 		 */
1815 		refcount_release(&tp->t_fb->tfb_refcnt);
1816 		/*
1817 		 * Set in the new stack.
1818 		 */
1819 		tp->t_fb = blk;
1820 		tp->t_fb_ptr = ptr;
1821 #ifdef TCP_OFFLOAD
1822 		if (tp->t_flags & TF_TOE) {
1823 			tcp_offload_ctloutput(tp, sopt->sopt_dir,
1824 			     sopt->sopt_name);
1825 		}
1826 #endif
1827 err_out:
1828 		INP_WUNLOCK(inp);
1829 		return (error);
1830 
1831 	}
1832 
1833 	/* Pass in the INP locked, callee must unlock it. */
1834 	return (tp->t_fb->tfb_tcp_ctloutput(tp, sopt));
1835 }
1836 
1837 static int
1838 tcp_ctloutput_get(struct inpcb *inp, struct sockopt *sopt)
1839 {
1840 	struct socket *so = inp->inp_socket;
1841 	struct tcpcb *tp = intotcpcb(inp);
1842 	int error = 0;
1843 
1844 	MPASS(sopt->sopt_dir == SOPT_GET);
1845 	INP_WLOCK_ASSERT(inp);
1846 	KASSERT((inp->inp_flags & INP_DROPPED) == 0,
1847 	    ("inp_flags == %x", inp->inp_flags));
1848 	KASSERT(so != NULL, ("inp_socket == NULL"));
1849 
1850 	if (sopt->sopt_level != IPPROTO_TCP) {
1851 		INP_WUNLOCK(inp);
1852 #ifdef INET6
1853 		if (inp->inp_vflag & INP_IPV6PROTO)
1854 			error = ip6_ctloutput(so, sopt);
1855 #endif /* INET6 */
1856 #if defined(INET6) && defined(INET)
1857 		else
1858 #endif
1859 #ifdef INET
1860 			error = ip_ctloutput(so, sopt);
1861 #endif
1862 		return (error);
1863 	}
1864 	if (((sopt->sopt_name == TCP_FUNCTION_BLK) ||
1865 	     (sopt->sopt_name == TCP_FUNCTION_ALIAS))) {
1866 		struct tcp_function_set fsn;
1867 
1868 		if (sopt->sopt_name == TCP_FUNCTION_ALIAS) {
1869 			memset(&fsn, 0, sizeof(fsn));
1870 			find_tcp_function_alias(tp->t_fb, &fsn);
1871 		} else {
1872 			strncpy(fsn.function_set_name,
1873 			    tp->t_fb->tfb_tcp_block_name,
1874 			    TCP_FUNCTION_NAME_LEN_MAX);
1875 			fsn.function_set_name[TCP_FUNCTION_NAME_LEN_MAX - 1] = '\0';
1876 		}
1877 		fsn.pcbcnt = tp->t_fb->tfb_refcnt;
1878 		INP_WUNLOCK(inp);
1879 		error = sooptcopyout(sopt, &fsn, sizeof fsn);
1880 		return (error);
1881 	}
1882 
1883 	/* Pass in the INP locked, callee must unlock it. */
1884 	return (tp->t_fb->tfb_tcp_ctloutput(tp, sopt));
1885 }
1886 
1887 int
1888 tcp_ctloutput(struct socket *so, struct sockopt *sopt)
1889 {
1890 	struct	inpcb *inp;
1891 
1892 	inp = sotoinpcb(so);
1893 	KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL"));
1894 
1895 	INP_WLOCK(inp);
1896 	if (inp->inp_flags & INP_DROPPED) {
1897 		INP_WUNLOCK(inp);
1898 		return (ECONNRESET);
1899 	}
1900 	if (sopt->sopt_dir == SOPT_SET)
1901 		return (tcp_ctloutput_set(inp, sopt));
1902 	else if (sopt->sopt_dir == SOPT_GET)
1903 		return (tcp_ctloutput_get(inp, sopt));
1904 	else
1905 		panic("%s: sopt_dir $%d", __func__, sopt->sopt_dir);
1906 }
1907 
1908 /*
1909  * If this assert becomes untrue, we need to change the size of the buf
1910  * variable in tcp_default_ctloutput().
1911  */
1912 #ifdef CTASSERT
1913 CTASSERT(TCP_CA_NAME_MAX <= TCP_LOG_ID_LEN);
1914 CTASSERT(TCP_LOG_REASON_LEN <= TCP_LOG_ID_LEN);
1915 #endif
1916 
1917 extern struct cc_algo newreno_cc_algo;
1918 
1919 static int
1920 tcp_set_cc_mod(struct inpcb *inp, struct sockopt *sopt)
1921 {
1922 	struct cc_algo *algo;
1923 	void *ptr = NULL;
1924 	struct tcpcb *tp;
1925 	struct cc_var cc_mem;
1926 	char	buf[TCP_CA_NAME_MAX];
1927 	size_t mem_sz;
1928 	int error;
1929 
1930 	INP_WUNLOCK(inp);
1931 	error = sooptcopyin(sopt, buf, TCP_CA_NAME_MAX - 1, 1);
1932 	if (error)
1933 		return(error);
1934 	buf[sopt->sopt_valsize] = '\0';
1935 	CC_LIST_RLOCK();
1936 	STAILQ_FOREACH(algo, &cc_list, entries) {
1937 		if (strncmp(buf, algo->name,
1938 			    TCP_CA_NAME_MAX) == 0) {
1939 			if (algo->flags & CC_MODULE_BEING_REMOVED) {
1940 				/* We can't "see" modules being unloaded */
1941 				continue;
1942 			}
1943 			break;
1944 		}
1945 	}
1946 	if (algo == NULL) {
1947 		CC_LIST_RUNLOCK();
1948 		return(ESRCH);
1949 	}
1950 	/*
1951 	 * With a reference the algorithm cannot be removed
1952 	 * so we hold a reference through the change process.
1953 	 */
1954 	cc_refer(algo);
1955 	CC_LIST_RUNLOCK();
1956 	if (algo->cb_init != NULL) {
1957 		/* We can now pre-get the memory for the CC */
1958 		mem_sz = (*algo->cc_data_sz)();
1959 		if (mem_sz == 0) {
1960 			goto no_mem_needed;
1961 		}
1962 		ptr = malloc(mem_sz, M_CC_MEM, M_WAITOK);
1963 	} else {
1964 no_mem_needed:
1965 		mem_sz = 0;
1966 		ptr = NULL;
1967 	}
1968 	/*
1969 	 * Make sure its all clean and zero and also get
1970 	 * back the inplock.
1971 	 */
1972 	memset(&cc_mem, 0, sizeof(cc_mem));
1973 	INP_WLOCK(inp);
1974 	if (inp->inp_flags & INP_DROPPED) {
1975 		INP_WUNLOCK(inp);
1976 		if (ptr)
1977 			free(ptr, M_CC_MEM);
1978 		/* Release our temp reference */
1979 		CC_LIST_RLOCK();
1980 		cc_release(algo);
1981 		CC_LIST_RUNLOCK();
1982 		return (ECONNRESET);
1983 	}
1984 	tp = intotcpcb(inp);
1985 	if (ptr != NULL)
1986 		memset(ptr, 0, mem_sz);
1987 	cc_mem.ccvc.tcp = tp;
1988 	/*
1989 	 * We once again hold a write lock over the tcb so it's
1990 	 * safe to do these things without ordering concerns.
1991 	 * Note here we init into stack memory.
1992 	 */
1993 	if (algo->cb_init != NULL)
1994 		error = algo->cb_init(&cc_mem, ptr);
1995 	else
1996 		error = 0;
1997 	/*
1998 	 * The CC algorithms, when given their memory
1999 	 * should not fail we could in theory have a
2000 	 * KASSERT here.
2001 	 */
2002 	if (error == 0) {
2003 		/*
2004 		 * Touchdown, lets go ahead and move the
2005 		 * connection to the new CC module by
2006 		 * copying in the cc_mem after we call
2007 		 * the old ones cleanup (if any).
2008 		 */
2009 		if (CC_ALGO(tp)->cb_destroy != NULL)
2010 			CC_ALGO(tp)->cb_destroy(&tp->t_ccv);
2011 		/* Detach the old CC from the tcpcb  */
2012 		cc_detach(tp);
2013 		/* Copy in our temp memory that was inited */
2014 		memcpy(&tp->t_ccv, &cc_mem, sizeof(struct cc_var));
2015 		/* Now attach the new, which takes a reference */
2016 		cc_attach(tp, algo);
2017 		/* Ok now are we where we have gotten past any conn_init? */
2018 		if (TCPS_HAVEESTABLISHED(tp->t_state) && (CC_ALGO(tp)->conn_init != NULL)) {
2019 			/* Yep run the connection init for the new CC */
2020 			CC_ALGO(tp)->conn_init(&tp->t_ccv);
2021 		}
2022 	} else if (ptr)
2023 		free(ptr, M_CC_MEM);
2024 	INP_WUNLOCK(inp);
2025 	/* Now lets release our temp reference */
2026 	CC_LIST_RLOCK();
2027 	cc_release(algo);
2028 	CC_LIST_RUNLOCK();
2029 	return (error);
2030 }
2031 
2032 int
2033 tcp_default_ctloutput(struct tcpcb *tp, struct sockopt *sopt)
2034 {
2035 	struct inpcb *inp = tptoinpcb(tp);
2036 	int	error, opt, optval;
2037 	u_int	ui;
2038 	struct	tcp_info ti;
2039 #ifdef KERN_TLS
2040 	struct tls_enable tls;
2041 	struct socket *so = inp->inp_socket;
2042 #endif
2043 	char	*pbuf, buf[TCP_LOG_ID_LEN];
2044 #ifdef STATS
2045 	struct statsblob *sbp;
2046 #endif
2047 	size_t	len;
2048 
2049 	INP_WLOCK_ASSERT(inp);
2050 	KASSERT((inp->inp_flags & INP_DROPPED) == 0,
2051 	    ("inp_flags == %x", inp->inp_flags));
2052 	KASSERT(inp->inp_socket != NULL, ("inp_socket == NULL"));
2053 
2054 	switch (sopt->sopt_level) {
2055 #ifdef INET6
2056 	case IPPROTO_IPV6:
2057 		MPASS(inp->inp_vflag & INP_IPV6PROTO);
2058 		switch (sopt->sopt_name) {
2059 		case IPV6_USE_MIN_MTU:
2060 			tcp6_use_min_mtu(tp);
2061 			/* FALLTHROUGH */
2062 		}
2063 		INP_WUNLOCK(inp);
2064 		return (0);
2065 #endif
2066 #ifdef INET
2067 	case IPPROTO_IP:
2068 		INP_WUNLOCK(inp);
2069 		return (0);
2070 #endif
2071 	}
2072 
2073 	/*
2074 	 * For TCP_CCALGOOPT forward the control to CC module, for both
2075 	 * SOPT_SET and SOPT_GET.
2076 	 */
2077 	switch (sopt->sopt_name) {
2078 	case TCP_CCALGOOPT:
2079 		INP_WUNLOCK(inp);
2080 		if (sopt->sopt_valsize > CC_ALGOOPT_LIMIT)
2081 			return (EINVAL);
2082 		pbuf = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK | M_ZERO);
2083 		error = sooptcopyin(sopt, pbuf, sopt->sopt_valsize,
2084 		    sopt->sopt_valsize);
2085 		if (error) {
2086 			free(pbuf, M_TEMP);
2087 			return (error);
2088 		}
2089 		INP_WLOCK_RECHECK_CLEANUP(inp, free(pbuf, M_TEMP));
2090 		if (CC_ALGO(tp)->ctl_output != NULL)
2091 			error = CC_ALGO(tp)->ctl_output(&tp->t_ccv, sopt, pbuf);
2092 		else
2093 			error = ENOENT;
2094 		INP_WUNLOCK(inp);
2095 		if (error == 0 && sopt->sopt_dir == SOPT_GET)
2096 			error = sooptcopyout(sopt, pbuf, sopt->sopt_valsize);
2097 		free(pbuf, M_TEMP);
2098 		return (error);
2099 	}
2100 
2101 	switch (sopt->sopt_dir) {
2102 	case SOPT_SET:
2103 		switch (sopt->sopt_name) {
2104 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
2105 		case TCP_MD5SIG:
2106 			INP_WUNLOCK(inp);
2107 			if (!TCPMD5_ENABLED())
2108 				return (ENOPROTOOPT);
2109 			error = TCPMD5_PCBCTL(inp, sopt);
2110 			if (error)
2111 				return (error);
2112 			INP_WLOCK_RECHECK(inp);
2113 			goto unlock_and_done;
2114 #endif /* IPSEC */
2115 
2116 		case TCP_NODELAY:
2117 		case TCP_NOOPT:
2118 			INP_WUNLOCK(inp);
2119 			error = sooptcopyin(sopt, &optval, sizeof optval,
2120 			    sizeof optval);
2121 			if (error)
2122 				return (error);
2123 
2124 			INP_WLOCK_RECHECK(inp);
2125 			switch (sopt->sopt_name) {
2126 			case TCP_NODELAY:
2127 				opt = TF_NODELAY;
2128 				break;
2129 			case TCP_NOOPT:
2130 				opt = TF_NOOPT;
2131 				break;
2132 			default:
2133 				opt = 0; /* dead code to fool gcc */
2134 				break;
2135 			}
2136 
2137 			if (optval)
2138 				tp->t_flags |= opt;
2139 			else
2140 				tp->t_flags &= ~opt;
2141 unlock_and_done:
2142 #ifdef TCP_OFFLOAD
2143 			if (tp->t_flags & TF_TOE) {
2144 				tcp_offload_ctloutput(tp, sopt->sopt_dir,
2145 				    sopt->sopt_name);
2146 			}
2147 #endif
2148 			INP_WUNLOCK(inp);
2149 			break;
2150 
2151 		case TCP_NOPUSH:
2152 			INP_WUNLOCK(inp);
2153 			error = sooptcopyin(sopt, &optval, sizeof optval,
2154 			    sizeof optval);
2155 			if (error)
2156 				return (error);
2157 
2158 			INP_WLOCK_RECHECK(inp);
2159 			if (optval)
2160 				tp->t_flags |= TF_NOPUSH;
2161 			else if (tp->t_flags & TF_NOPUSH) {
2162 				tp->t_flags &= ~TF_NOPUSH;
2163 				if (TCPS_HAVEESTABLISHED(tp->t_state)) {
2164 					struct epoch_tracker et;
2165 
2166 					NET_EPOCH_ENTER(et);
2167 					error = tcp_output_nodrop(tp);
2168 					NET_EPOCH_EXIT(et);
2169 				}
2170 			}
2171 			goto unlock_and_done;
2172 
2173 		case TCP_REMOTE_UDP_ENCAPS_PORT:
2174 			INP_WUNLOCK(inp);
2175 			error = sooptcopyin(sopt, &optval, sizeof optval,
2176 			    sizeof optval);
2177 			if (error)
2178 				return (error);
2179 			if ((optval < TCP_TUNNELING_PORT_MIN) ||
2180 			    (optval > TCP_TUNNELING_PORT_MAX)) {
2181 				/* Its got to be in range */
2182 				return (EINVAL);
2183 			}
2184 			if ((V_tcp_udp_tunneling_port == 0) && (optval != 0)) {
2185 				/* You have to have enabled a UDP tunneling port first */
2186 				return (EINVAL);
2187 			}
2188 			INP_WLOCK_RECHECK(inp);
2189 			if (tp->t_state != TCPS_CLOSED) {
2190 				/* You can't change after you are connected */
2191 				error = EINVAL;
2192 			} else {
2193 				/* Ok we are all good set the port */
2194 				tp->t_port = htons(optval);
2195 			}
2196 			goto unlock_and_done;
2197 
2198 		case TCP_MAXSEG:
2199 			INP_WUNLOCK(inp);
2200 			error = sooptcopyin(sopt, &optval, sizeof optval,
2201 			    sizeof optval);
2202 			if (error)
2203 				return (error);
2204 
2205 			INP_WLOCK_RECHECK(inp);
2206 			if (optval > 0 && optval <= tp->t_maxseg &&
2207 			    optval + 40 >= V_tcp_minmss)
2208 				tp->t_maxseg = optval;
2209 			else
2210 				error = EINVAL;
2211 			goto unlock_and_done;
2212 
2213 		case TCP_INFO:
2214 			INP_WUNLOCK(inp);
2215 			error = EINVAL;
2216 			break;
2217 
2218 		case TCP_STATS:
2219 			INP_WUNLOCK(inp);
2220 #ifdef STATS
2221 			error = sooptcopyin(sopt, &optval, sizeof optval,
2222 			    sizeof optval);
2223 			if (error)
2224 				return (error);
2225 
2226 			if (optval > 0)
2227 				sbp = stats_blob_alloc(
2228 				    V_tcp_perconn_stats_dflt_tpl, 0);
2229 			else
2230 				sbp = NULL;
2231 
2232 			INP_WLOCK_RECHECK(inp);
2233 			if ((tp->t_stats != NULL && sbp == NULL) ||
2234 			    (tp->t_stats == NULL && sbp != NULL)) {
2235 				struct statsblob *t = tp->t_stats;
2236 				tp->t_stats = sbp;
2237 				sbp = t;
2238 			}
2239 			INP_WUNLOCK(inp);
2240 
2241 			stats_blob_destroy(sbp);
2242 #else
2243 			return (EOPNOTSUPP);
2244 #endif /* !STATS */
2245 			break;
2246 
2247 		case TCP_CONGESTION:
2248 			error = tcp_set_cc_mod(inp, sopt);
2249 			break;
2250 
2251 		case TCP_REUSPORT_LB_NUMA:
2252 			INP_WUNLOCK(inp);
2253 			error = sooptcopyin(sopt, &optval, sizeof(optval),
2254 			    sizeof(optval));
2255 			INP_WLOCK_RECHECK(inp);
2256 			if (!error)
2257 				error = in_pcblbgroup_numa(inp, optval);
2258 			INP_WUNLOCK(inp);
2259 			break;
2260 
2261 #ifdef KERN_TLS
2262 		case TCP_TXTLS_ENABLE:
2263 			INP_WUNLOCK(inp);
2264 			error = ktls_copyin_tls_enable(sopt, &tls);
2265 			if (error != 0)
2266 				break;
2267 			error = ktls_enable_tx(so, &tls);
2268 			ktls_cleanup_tls_enable(&tls);
2269 			break;
2270 		case TCP_TXTLS_MODE:
2271 			INP_WUNLOCK(inp);
2272 			error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
2273 			if (error != 0)
2274 				return (error);
2275 
2276 			INP_WLOCK_RECHECK(inp);
2277 			error = ktls_set_tx_mode(so, ui);
2278 			INP_WUNLOCK(inp);
2279 			break;
2280 		case TCP_RXTLS_ENABLE:
2281 			INP_WUNLOCK(inp);
2282 			error = ktls_copyin_tls_enable(sopt, &tls);
2283 			if (error != 0)
2284 				break;
2285 			error = ktls_enable_rx(so, &tls);
2286 			ktls_cleanup_tls_enable(&tls);
2287 			break;
2288 #endif
2289 		case TCP_MAXUNACKTIME:
2290 		case TCP_KEEPIDLE:
2291 		case TCP_KEEPINTVL:
2292 		case TCP_KEEPINIT:
2293 			INP_WUNLOCK(inp);
2294 			error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
2295 			if (error)
2296 				return (error);
2297 
2298 			if (ui > (UINT_MAX / hz)) {
2299 				error = EINVAL;
2300 				break;
2301 			}
2302 			ui *= hz;
2303 
2304 			INP_WLOCK_RECHECK(inp);
2305 			switch (sopt->sopt_name) {
2306 			case TCP_MAXUNACKTIME:
2307 				tp->t_maxunacktime = ui;
2308 				break;
2309 
2310 			case TCP_KEEPIDLE:
2311 				tp->t_keepidle = ui;
2312 				/*
2313 				 * XXX: better check current remaining
2314 				 * timeout and "merge" it with new value.
2315 				 */
2316 				if ((tp->t_state > TCPS_LISTEN) &&
2317 				    (tp->t_state <= TCPS_CLOSING))
2318 					tcp_timer_activate(tp, TT_KEEP,
2319 					    TP_KEEPIDLE(tp));
2320 				break;
2321 			case TCP_KEEPINTVL:
2322 				tp->t_keepintvl = ui;
2323 				if ((tp->t_state == TCPS_FIN_WAIT_2) &&
2324 				    (TP_MAXIDLE(tp) > 0))
2325 					tcp_timer_activate(tp, TT_2MSL,
2326 					    TP_MAXIDLE(tp));
2327 				break;
2328 			case TCP_KEEPINIT:
2329 				tp->t_keepinit = ui;
2330 				if (tp->t_state == TCPS_SYN_RECEIVED ||
2331 				    tp->t_state == TCPS_SYN_SENT)
2332 					tcp_timer_activate(tp, TT_KEEP,
2333 					    TP_KEEPINIT(tp));
2334 				break;
2335 			}
2336 			goto unlock_and_done;
2337 
2338 		case TCP_KEEPCNT:
2339 			INP_WUNLOCK(inp);
2340 			error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
2341 			if (error)
2342 				return (error);
2343 
2344 			INP_WLOCK_RECHECK(inp);
2345 			tp->t_keepcnt = ui;
2346 			if ((tp->t_state == TCPS_FIN_WAIT_2) &&
2347 			    (TP_MAXIDLE(tp) > 0))
2348 				tcp_timer_activate(tp, TT_2MSL,
2349 				    TP_MAXIDLE(tp));
2350 			goto unlock_and_done;
2351 
2352 #ifdef TCPPCAP
2353 		case TCP_PCAP_OUT:
2354 		case TCP_PCAP_IN:
2355 			INP_WUNLOCK(inp);
2356 			error = sooptcopyin(sopt, &optval, sizeof optval,
2357 			    sizeof optval);
2358 			if (error)
2359 				return (error);
2360 
2361 			INP_WLOCK_RECHECK(inp);
2362 			if (optval >= 0)
2363 				tcp_pcap_set_sock_max(
2364 					(sopt->sopt_name == TCP_PCAP_OUT) ?
2365 					&(tp->t_outpkts) : &(tp->t_inpkts),
2366 					optval);
2367 			else
2368 				error = EINVAL;
2369 			goto unlock_and_done;
2370 #endif
2371 
2372 		case TCP_FASTOPEN: {
2373 			struct tcp_fastopen tfo_optval;
2374 
2375 			INP_WUNLOCK(inp);
2376 			if (!V_tcp_fastopen_client_enable &&
2377 			    !V_tcp_fastopen_server_enable)
2378 				return (EPERM);
2379 
2380 			error = sooptcopyin(sopt, &tfo_optval,
2381 				    sizeof(tfo_optval), sizeof(int));
2382 			if (error)
2383 				return (error);
2384 
2385 			INP_WLOCK_RECHECK(inp);
2386 			if ((tp->t_state != TCPS_CLOSED) &&
2387 			    (tp->t_state != TCPS_LISTEN)) {
2388 				error = EINVAL;
2389 				goto unlock_and_done;
2390 			}
2391 			if (tfo_optval.enable) {
2392 				if (tp->t_state == TCPS_LISTEN) {
2393 					if (!V_tcp_fastopen_server_enable) {
2394 						error = EPERM;
2395 						goto unlock_and_done;
2396 					}
2397 
2398 					if (tp->t_tfo_pending == NULL)
2399 						tp->t_tfo_pending =
2400 						    tcp_fastopen_alloc_counter();
2401 				} else {
2402 					/*
2403 					 * If a pre-shared key was provided,
2404 					 * stash it in the client cookie
2405 					 * field of the tcpcb for use during
2406 					 * connect.
2407 					 */
2408 					if (sopt->sopt_valsize ==
2409 					    sizeof(tfo_optval)) {
2410 						memcpy(tp->t_tfo_cookie.client,
2411 						       tfo_optval.psk,
2412 						       TCP_FASTOPEN_PSK_LEN);
2413 						tp->t_tfo_client_cookie_len =
2414 						    TCP_FASTOPEN_PSK_LEN;
2415 					}
2416 				}
2417 				tp->t_flags |= TF_FASTOPEN;
2418 			} else
2419 				tp->t_flags &= ~TF_FASTOPEN;
2420 			goto unlock_and_done;
2421 		}
2422 
2423 #ifdef TCP_BLACKBOX
2424 		case TCP_LOG:
2425 			INP_WUNLOCK(inp);
2426 			error = sooptcopyin(sopt, &optval, sizeof optval,
2427 			    sizeof optval);
2428 			if (error)
2429 				return (error);
2430 
2431 			INP_WLOCK_RECHECK(inp);
2432 			error = tcp_log_state_change(tp, optval);
2433 			goto unlock_and_done;
2434 
2435 		case TCP_LOGBUF:
2436 			INP_WUNLOCK(inp);
2437 			error = EINVAL;
2438 			break;
2439 
2440 		case TCP_LOGID:
2441 			INP_WUNLOCK(inp);
2442 			error = sooptcopyin(sopt, buf, TCP_LOG_ID_LEN - 1, 0);
2443 			if (error)
2444 				break;
2445 			buf[sopt->sopt_valsize] = '\0';
2446 			INP_WLOCK_RECHECK(inp);
2447 			error = tcp_log_set_id(tp, buf);
2448 			/* tcp_log_set_id() unlocks the INP. */
2449 			break;
2450 
2451 		case TCP_LOGDUMP:
2452 		case TCP_LOGDUMPID:
2453 			INP_WUNLOCK(inp);
2454 			error =
2455 			    sooptcopyin(sopt, buf, TCP_LOG_REASON_LEN - 1, 0);
2456 			if (error)
2457 				break;
2458 			buf[sopt->sopt_valsize] = '\0';
2459 			INP_WLOCK_RECHECK(inp);
2460 			if (sopt->sopt_name == TCP_LOGDUMP) {
2461 				error = tcp_log_dump_tp_logbuf(tp, buf,
2462 				    M_WAITOK, true);
2463 				INP_WUNLOCK(inp);
2464 			} else {
2465 				tcp_log_dump_tp_bucket_logbufs(tp, buf);
2466 				/*
2467 				 * tcp_log_dump_tp_bucket_logbufs() drops the
2468 				 * INP lock.
2469 				 */
2470 			}
2471 			break;
2472 #endif
2473 
2474 		default:
2475 			INP_WUNLOCK(inp);
2476 			error = ENOPROTOOPT;
2477 			break;
2478 		}
2479 		break;
2480 
2481 	case SOPT_GET:
2482 		tp = intotcpcb(inp);
2483 		switch (sopt->sopt_name) {
2484 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
2485 		case TCP_MD5SIG:
2486 			INP_WUNLOCK(inp);
2487 			if (!TCPMD5_ENABLED())
2488 				return (ENOPROTOOPT);
2489 			error = TCPMD5_PCBCTL(inp, sopt);
2490 			break;
2491 #endif
2492 
2493 		case TCP_NODELAY:
2494 			optval = tp->t_flags & TF_NODELAY;
2495 			INP_WUNLOCK(inp);
2496 			error = sooptcopyout(sopt, &optval, sizeof optval);
2497 			break;
2498 		case TCP_MAXSEG:
2499 			optval = tp->t_maxseg;
2500 			INP_WUNLOCK(inp);
2501 			error = sooptcopyout(sopt, &optval, sizeof optval);
2502 			break;
2503 		case TCP_REMOTE_UDP_ENCAPS_PORT:
2504 			optval = ntohs(tp->t_port);
2505 			INP_WUNLOCK(inp);
2506 			error = sooptcopyout(sopt, &optval, sizeof optval);
2507 			break;
2508 		case TCP_NOOPT:
2509 			optval = tp->t_flags & TF_NOOPT;
2510 			INP_WUNLOCK(inp);
2511 			error = sooptcopyout(sopt, &optval, sizeof optval);
2512 			break;
2513 		case TCP_NOPUSH:
2514 			optval = tp->t_flags & TF_NOPUSH;
2515 			INP_WUNLOCK(inp);
2516 			error = sooptcopyout(sopt, &optval, sizeof optval);
2517 			break;
2518 		case TCP_INFO:
2519 			tcp_fill_info(tp, &ti);
2520 			INP_WUNLOCK(inp);
2521 			error = sooptcopyout(sopt, &ti, sizeof ti);
2522 			break;
2523 		case TCP_STATS:
2524 			{
2525 #ifdef STATS
2526 			int nheld;
2527 			TYPEOF_MEMBER(struct statsblob, flags) sbflags = 0;
2528 
2529 			error = 0;
2530 			socklen_t outsbsz = sopt->sopt_valsize;
2531 			if (tp->t_stats == NULL)
2532 				error = ENOENT;
2533 			else if (outsbsz >= tp->t_stats->cursz)
2534 				outsbsz = tp->t_stats->cursz;
2535 			else if (outsbsz >= sizeof(struct statsblob))
2536 				outsbsz = sizeof(struct statsblob);
2537 			else
2538 				error = EINVAL;
2539 			INP_WUNLOCK(inp);
2540 			if (error)
2541 				break;
2542 
2543 			sbp = sopt->sopt_val;
2544 			nheld = atop(round_page(((vm_offset_t)sbp) +
2545 			    (vm_size_t)outsbsz) - trunc_page((vm_offset_t)sbp));
2546 			vm_page_t ma[nheld];
2547 			if (vm_fault_quick_hold_pages(
2548 			    &curproc->p_vmspace->vm_map, (vm_offset_t)sbp,
2549 			    outsbsz, VM_PROT_READ | VM_PROT_WRITE, ma,
2550 			    nheld) < 0) {
2551 				error = EFAULT;
2552 				break;
2553 			}
2554 
2555 			if ((error = copyin_nofault(&(sbp->flags), &sbflags,
2556 			    SIZEOF_MEMBER(struct statsblob, flags))))
2557 				goto unhold;
2558 
2559 			INP_WLOCK_RECHECK(inp);
2560 			error = stats_blob_snapshot(&sbp, outsbsz, tp->t_stats,
2561 			    sbflags | SB_CLONE_USRDSTNOFAULT);
2562 			INP_WUNLOCK(inp);
2563 			sopt->sopt_valsize = outsbsz;
2564 unhold:
2565 			vm_page_unhold_pages(ma, nheld);
2566 #else
2567 			INP_WUNLOCK(inp);
2568 			error = EOPNOTSUPP;
2569 #endif /* !STATS */
2570 			break;
2571 			}
2572 		case TCP_CONGESTION:
2573 			len = strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX);
2574 			INP_WUNLOCK(inp);
2575 			error = sooptcopyout(sopt, buf, len + 1);
2576 			break;
2577 		case TCP_MAXUNACKTIME:
2578 		case TCP_KEEPIDLE:
2579 		case TCP_KEEPINTVL:
2580 		case TCP_KEEPINIT:
2581 		case TCP_KEEPCNT:
2582 			switch (sopt->sopt_name) {
2583 			case TCP_MAXUNACKTIME:
2584 				ui = TP_MAXUNACKTIME(tp) / hz;
2585 				break;
2586 			case TCP_KEEPIDLE:
2587 				ui = TP_KEEPIDLE(tp) / hz;
2588 				break;
2589 			case TCP_KEEPINTVL:
2590 				ui = TP_KEEPINTVL(tp) / hz;
2591 				break;
2592 			case TCP_KEEPINIT:
2593 				ui = TP_KEEPINIT(tp) / hz;
2594 				break;
2595 			case TCP_KEEPCNT:
2596 				ui = TP_KEEPCNT(tp);
2597 				break;
2598 			}
2599 			INP_WUNLOCK(inp);
2600 			error = sooptcopyout(sopt, &ui, sizeof(ui));
2601 			break;
2602 #ifdef TCPPCAP
2603 		case TCP_PCAP_OUT:
2604 		case TCP_PCAP_IN:
2605 			optval = tcp_pcap_get_sock_max(
2606 					(sopt->sopt_name == TCP_PCAP_OUT) ?
2607 					&(tp->t_outpkts) : &(tp->t_inpkts));
2608 			INP_WUNLOCK(inp);
2609 			error = sooptcopyout(sopt, &optval, sizeof optval);
2610 			break;
2611 #endif
2612 		case TCP_FASTOPEN:
2613 			optval = tp->t_flags & TF_FASTOPEN;
2614 			INP_WUNLOCK(inp);
2615 			error = sooptcopyout(sopt, &optval, sizeof optval);
2616 			break;
2617 #ifdef TCP_BLACKBOX
2618 		case TCP_LOG:
2619 			optval = tcp_get_bblog_state(tp);
2620 			INP_WUNLOCK(inp);
2621 			error = sooptcopyout(sopt, &optval, sizeof(optval));
2622 			break;
2623 		case TCP_LOGBUF:
2624 			/* tcp_log_getlogbuf() does INP_WUNLOCK(inp) */
2625 			error = tcp_log_getlogbuf(sopt, tp);
2626 			break;
2627 		case TCP_LOGID:
2628 			len = tcp_log_get_id(tp, buf);
2629 			INP_WUNLOCK(inp);
2630 			error = sooptcopyout(sopt, buf, len + 1);
2631 			break;
2632 		case TCP_LOGDUMP:
2633 		case TCP_LOGDUMPID:
2634 			INP_WUNLOCK(inp);
2635 			error = EINVAL;
2636 			break;
2637 #endif
2638 #ifdef KERN_TLS
2639 		case TCP_TXTLS_MODE:
2640 			error = ktls_get_tx_mode(so, &optval);
2641 			INP_WUNLOCK(inp);
2642 			if (error == 0)
2643 				error = sooptcopyout(sopt, &optval,
2644 				    sizeof(optval));
2645 			break;
2646 		case TCP_RXTLS_MODE:
2647 			error = ktls_get_rx_mode(so, &optval);
2648 			INP_WUNLOCK(inp);
2649 			if (error == 0)
2650 				error = sooptcopyout(sopt, &optval,
2651 				    sizeof(optval));
2652 			break;
2653 #endif
2654 		default:
2655 			INP_WUNLOCK(inp);
2656 			error = ENOPROTOOPT;
2657 			break;
2658 		}
2659 		break;
2660 	}
2661 	return (error);
2662 }
2663 #undef INP_WLOCK_RECHECK
2664 #undef INP_WLOCK_RECHECK_CLEANUP
2665 
2666 /*
2667  * Initiate (or continue) disconnect.
2668  * If embryonic state, just send reset (once).
2669  * If in ``let data drain'' option and linger null, just drop.
2670  * Otherwise (hard), mark socket disconnecting and drop
2671  * current input data; switch states based on user close, and
2672  * send segment to peer (with FIN).
2673  */
2674 static void
2675 tcp_disconnect(struct tcpcb *tp)
2676 {
2677 	struct inpcb *inp = tptoinpcb(tp);
2678 	struct socket *so = tptosocket(tp);
2679 
2680 	NET_EPOCH_ASSERT();
2681 	INP_WLOCK_ASSERT(inp);
2682 
2683 	/*
2684 	 * Neither tcp_close() nor tcp_drop() should return NULL, as the
2685 	 * socket is still open.
2686 	 */
2687 	if (tp->t_state < TCPS_ESTABLISHED &&
2688 	    !(tp->t_state > TCPS_LISTEN && IS_FASTOPEN(tp->t_flags))) {
2689 		tp = tcp_close(tp);
2690 		KASSERT(tp != NULL,
2691 		    ("tcp_disconnect: tcp_close() returned NULL"));
2692 	} else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
2693 		tp = tcp_drop(tp, 0);
2694 		KASSERT(tp != NULL,
2695 		    ("tcp_disconnect: tcp_drop() returned NULL"));
2696 	} else {
2697 		soisdisconnecting(so);
2698 		sbflush(&so->so_rcv);
2699 		tcp_usrclosed(tp);
2700 		if (!(inp->inp_flags & INP_DROPPED))
2701 			/* Ignore stack's drop request, we already at it. */
2702 			(void)tcp_output_nodrop(tp);
2703 	}
2704 }
2705 
2706 /*
2707  * User issued close, and wish to trail through shutdown states:
2708  * if never received SYN, just forget it.  If got a SYN from peer,
2709  * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
2710  * If already got a FIN from peer, then almost done; go to LAST_ACK
2711  * state.  In all other cases, have already sent FIN to peer (e.g.
2712  * after PRU_SHUTDOWN), and just have to play tedious game waiting
2713  * for peer to send FIN or not respond to keep-alives, etc.
2714  * We can let the user exit from the close as soon as the FIN is acked.
2715  */
2716 static void
2717 tcp_usrclosed(struct tcpcb *tp)
2718 {
2719 
2720 	NET_EPOCH_ASSERT();
2721 	INP_WLOCK_ASSERT(tptoinpcb(tp));
2722 
2723 	switch (tp->t_state) {
2724 	case TCPS_LISTEN:
2725 #ifdef TCP_OFFLOAD
2726 		tcp_offload_listen_stop(tp);
2727 #endif
2728 		tcp_state_change(tp, TCPS_CLOSED);
2729 		/* FALLTHROUGH */
2730 	case TCPS_CLOSED:
2731 		tp = tcp_close(tp);
2732 		/*
2733 		 * tcp_close() should never return NULL here as the socket is
2734 		 * still open.
2735 		 */
2736 		KASSERT(tp != NULL,
2737 		    ("tcp_usrclosed: tcp_close() returned NULL"));
2738 		break;
2739 
2740 	case TCPS_SYN_SENT:
2741 	case TCPS_SYN_RECEIVED:
2742 		tp->t_flags |= TF_NEEDFIN;
2743 		break;
2744 
2745 	case TCPS_ESTABLISHED:
2746 		tcp_state_change(tp, TCPS_FIN_WAIT_1);
2747 		break;
2748 
2749 	case TCPS_CLOSE_WAIT:
2750 		tcp_state_change(tp, TCPS_LAST_ACK);
2751 		break;
2752 	}
2753 	if (tp->t_acktime == 0)
2754 		tp->t_acktime = ticks;
2755 	if (tp->t_state >= TCPS_FIN_WAIT_2) {
2756 		tcp_free_sackholes(tp);
2757 		soisdisconnected(tptosocket(tp));
2758 		/* Prevent the connection hanging in FIN_WAIT_2 forever. */
2759 		if (tp->t_state == TCPS_FIN_WAIT_2) {
2760 			int timeout;
2761 
2762 			timeout = (tcp_fast_finwait2_recycle) ?
2763 			    tcp_finwait2_timeout : TP_MAXIDLE(tp);
2764 			tcp_timer_activate(tp, TT_2MSL, timeout);
2765 		}
2766 	}
2767 }
2768 
2769 #ifdef DDB
2770 static void
2771 db_print_indent(int indent)
2772 {
2773 	int i;
2774 
2775 	for (i = 0; i < indent; i++)
2776 		db_printf(" ");
2777 }
2778 
2779 static void
2780 db_print_tstate(int t_state)
2781 {
2782 
2783 	switch (t_state) {
2784 	case TCPS_CLOSED:
2785 		db_printf("TCPS_CLOSED");
2786 		return;
2787 
2788 	case TCPS_LISTEN:
2789 		db_printf("TCPS_LISTEN");
2790 		return;
2791 
2792 	case TCPS_SYN_SENT:
2793 		db_printf("TCPS_SYN_SENT");
2794 		return;
2795 
2796 	case TCPS_SYN_RECEIVED:
2797 		db_printf("TCPS_SYN_RECEIVED");
2798 		return;
2799 
2800 	case TCPS_ESTABLISHED:
2801 		db_printf("TCPS_ESTABLISHED");
2802 		return;
2803 
2804 	case TCPS_CLOSE_WAIT:
2805 		db_printf("TCPS_CLOSE_WAIT");
2806 		return;
2807 
2808 	case TCPS_FIN_WAIT_1:
2809 		db_printf("TCPS_FIN_WAIT_1");
2810 		return;
2811 
2812 	case TCPS_CLOSING:
2813 		db_printf("TCPS_CLOSING");
2814 		return;
2815 
2816 	case TCPS_LAST_ACK:
2817 		db_printf("TCPS_LAST_ACK");
2818 		return;
2819 
2820 	case TCPS_FIN_WAIT_2:
2821 		db_printf("TCPS_FIN_WAIT_2");
2822 		return;
2823 
2824 	case TCPS_TIME_WAIT:
2825 		db_printf("TCPS_TIME_WAIT");
2826 		return;
2827 
2828 	default:
2829 		db_printf("unknown");
2830 		return;
2831 	}
2832 }
2833 
2834 static void
2835 db_print_tflags(u_int t_flags)
2836 {
2837 	int comma;
2838 
2839 	comma = 0;
2840 	if (t_flags & TF_ACKNOW) {
2841 		db_printf("%sTF_ACKNOW", comma ? ", " : "");
2842 		comma = 1;
2843 	}
2844 	if (t_flags & TF_DELACK) {
2845 		db_printf("%sTF_DELACK", comma ? ", " : "");
2846 		comma = 1;
2847 	}
2848 	if (t_flags & TF_NODELAY) {
2849 		db_printf("%sTF_NODELAY", comma ? ", " : "");
2850 		comma = 1;
2851 	}
2852 	if (t_flags & TF_NOOPT) {
2853 		db_printf("%sTF_NOOPT", comma ? ", " : "");
2854 		comma = 1;
2855 	}
2856 	if (t_flags & TF_SENTFIN) {
2857 		db_printf("%sTF_SENTFIN", comma ? ", " : "");
2858 		comma = 1;
2859 	}
2860 	if (t_flags & TF_REQ_SCALE) {
2861 		db_printf("%sTF_REQ_SCALE", comma ? ", " : "");
2862 		comma = 1;
2863 	}
2864 	if (t_flags & TF_RCVD_SCALE) {
2865 		db_printf("%sTF_RECVD_SCALE", comma ? ", " : "");
2866 		comma = 1;
2867 	}
2868 	if (t_flags & TF_REQ_TSTMP) {
2869 		db_printf("%sTF_REQ_TSTMP", comma ? ", " : "");
2870 		comma = 1;
2871 	}
2872 	if (t_flags & TF_RCVD_TSTMP) {
2873 		db_printf("%sTF_RCVD_TSTMP", comma ? ", " : "");
2874 		comma = 1;
2875 	}
2876 	if (t_flags & TF_SACK_PERMIT) {
2877 		db_printf("%sTF_SACK_PERMIT", comma ? ", " : "");
2878 		comma = 1;
2879 	}
2880 	if (t_flags & TF_NEEDSYN) {
2881 		db_printf("%sTF_NEEDSYN", comma ? ", " : "");
2882 		comma = 1;
2883 	}
2884 	if (t_flags & TF_NEEDFIN) {
2885 		db_printf("%sTF_NEEDFIN", comma ? ", " : "");
2886 		comma = 1;
2887 	}
2888 	if (t_flags & TF_NOPUSH) {
2889 		db_printf("%sTF_NOPUSH", comma ? ", " : "");
2890 		comma = 1;
2891 	}
2892 	if (t_flags & TF_PREVVALID) {
2893 		db_printf("%sTF_PREVVALID", comma ? ", " : "");
2894 		comma = 1;
2895 	}
2896 	if (t_flags & TF_MORETOCOME) {
2897 		db_printf("%sTF_MORETOCOME", comma ? ", " : "");
2898 		comma = 1;
2899 	}
2900 	if (t_flags & TF_SONOTCONN) {
2901 		db_printf("%sTF_SONOTCONN", comma ? ", " : "");
2902 		comma = 1;
2903 	}
2904 	if (t_flags & TF_LASTIDLE) {
2905 		db_printf("%sTF_LASTIDLE", comma ? ", " : "");
2906 		comma = 1;
2907 	}
2908 	if (t_flags & TF_RXWIN0SENT) {
2909 		db_printf("%sTF_RXWIN0SENT", comma ? ", " : "");
2910 		comma = 1;
2911 	}
2912 	if (t_flags & TF_FASTRECOVERY) {
2913 		db_printf("%sTF_FASTRECOVERY", comma ? ", " : "");
2914 		comma = 1;
2915 	}
2916 	if (t_flags & TF_CONGRECOVERY) {
2917 		db_printf("%sTF_CONGRECOVERY", comma ? ", " : "");
2918 		comma = 1;
2919 	}
2920 	if (t_flags & TF_WASFRECOVERY) {
2921 		db_printf("%sTF_WASFRECOVERY", comma ? ", " : "");
2922 		comma = 1;
2923 	}
2924 	if (t_flags & TF_WASCRECOVERY) {
2925 		db_printf("%sTF_WASCRECOVERY", comma ? ", " : "");
2926 		comma = 1;
2927 	}
2928 	if (t_flags & TF_SIGNATURE) {
2929 		db_printf("%sTF_SIGNATURE", comma ? ", " : "");
2930 		comma = 1;
2931 	}
2932 	if (t_flags & TF_FORCEDATA) {
2933 		db_printf("%sTF_FORCEDATA", comma ? ", " : "");
2934 		comma = 1;
2935 	}
2936 	if (t_flags & TF_TSO) {
2937 		db_printf("%sTF_TSO", comma ? ", " : "");
2938 		comma = 1;
2939 	}
2940 	if (t_flags & TF_FASTOPEN) {
2941 		db_printf("%sTF_FASTOPEN", comma ? ", " : "");
2942 		comma = 1;
2943 	}
2944 }
2945 
2946 static void
2947 db_print_tflags2(u_int t_flags2)
2948 {
2949 	int comma;
2950 
2951 	comma = 0;
2952 	if (t_flags2 & TF2_PLPMTU_BLACKHOLE) {
2953 		db_printf("%sTF2_PLPMTU_BLACKHOLE", comma ? ", " : "");
2954 		comma = 1;
2955 	}
2956 	if (t_flags2 & TF2_PLPMTU_PMTUD) {
2957 		db_printf("%sTF2_PLPMTU_PMTUD", comma ? ", " : "");
2958 		comma = 1;
2959 	}
2960 	if (t_flags2 & TF2_PLPMTU_MAXSEGSNT) {
2961 		db_printf("%sTF2_PLPMTU_MAXSEGSNT", comma ? ", " : "");
2962 		comma = 1;
2963 	}
2964 	if (t_flags2 & TF2_LOG_AUTO) {
2965 		db_printf("%sTF2_LOG_AUTO", comma ? ", " : "");
2966 		comma = 1;
2967 	}
2968 	if (t_flags2 & TF2_DROP_AF_DATA) {
2969 		db_printf("%sTF2_DROP_AF_DATA", comma ? ", " : "");
2970 		comma = 1;
2971 	}
2972 	if (t_flags2 & TF2_ECN_PERMIT) {
2973 		db_printf("%sTF2_ECN_PERMIT", comma ? ", " : "");
2974 		comma = 1;
2975 	}
2976 	if (t_flags2 & TF2_ECN_SND_CWR) {
2977 		db_printf("%sTF2_ECN_SND_CWR", comma ? ", " : "");
2978 		comma = 1;
2979 	}
2980 	if (t_flags2 & TF2_ECN_SND_ECE) {
2981 		db_printf("%sTF2_ECN_SND_ECE", comma ? ", " : "");
2982 		comma = 1;
2983 	}
2984 	if (t_flags2 & TF2_ACE_PERMIT) {
2985 		db_printf("%sTF2_ACE_PERMIT", comma ? ", " : "");
2986 		comma = 1;
2987 	}
2988 	if (t_flags2 & TF2_FBYTES_COMPLETE) {
2989 		db_printf("%sTF2_FBYTES_COMPLETE", comma ? ", " : "");
2990 		comma = 1;
2991 	}
2992 }
2993 
2994 static void
2995 db_print_toobflags(char t_oobflags)
2996 {
2997 	int comma;
2998 
2999 	comma = 0;
3000 	if (t_oobflags & TCPOOB_HAVEDATA) {
3001 		db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : "");
3002 		comma = 1;
3003 	}
3004 	if (t_oobflags & TCPOOB_HADDATA) {
3005 		db_printf("%sTCPOOB_HADDATA", comma ? ", " : "");
3006 		comma = 1;
3007 	}
3008 }
3009 
3010 static void
3011 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent)
3012 {
3013 
3014 	db_print_indent(indent);
3015 	db_printf("%s at %p\n", name, tp);
3016 
3017 	indent += 2;
3018 
3019 	db_print_indent(indent);
3020 	db_printf("t_segq first: %p   t_segqlen: %d   t_dupacks: %d\n",
3021 	   TAILQ_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks);
3022 
3023 	db_print_indent(indent);
3024 	db_printf("t_callout: %p   t_timers: %p\n",
3025 	    &tp->t_callout, &tp->t_timers);
3026 
3027 	db_print_indent(indent);
3028 	db_printf("t_state: %d (", tp->t_state);
3029 	db_print_tstate(tp->t_state);
3030 	db_printf(")\n");
3031 
3032 	db_print_indent(indent);
3033 	db_printf("t_flags: 0x%x (", tp->t_flags);
3034 	db_print_tflags(tp->t_flags);
3035 	db_printf(")\n");
3036 
3037 	db_print_indent(indent);
3038 	db_printf("t_flags2: 0x%x (", tp->t_flags2);
3039 	db_print_tflags2(tp->t_flags2);
3040 	db_printf(")\n");
3041 
3042 	db_print_indent(indent);
3043 	db_printf("snd_una: 0x%08x   snd_max: 0x%08x   snd_nxt: 0x%08x\n",
3044 	    tp->snd_una, tp->snd_max, tp->snd_nxt);
3045 
3046 	db_print_indent(indent);
3047 	db_printf("snd_up: 0x%08x   snd_wl1: 0x%08x   snd_wl2: 0x%08x\n",
3048 	   tp->snd_up, tp->snd_wl1, tp->snd_wl2);
3049 
3050 	db_print_indent(indent);
3051 	db_printf("iss: 0x%08x   irs: 0x%08x   rcv_nxt: 0x%08x\n",
3052 	    tp->iss, tp->irs, tp->rcv_nxt);
3053 
3054 	db_print_indent(indent);
3055 	db_printf("rcv_adv: 0x%08x   rcv_wnd: %u   rcv_up: 0x%08x\n",
3056 	    tp->rcv_adv, tp->rcv_wnd, tp->rcv_up);
3057 
3058 	db_print_indent(indent);
3059 	db_printf("snd_wnd: %u   snd_cwnd: %u\n",
3060 	   tp->snd_wnd, tp->snd_cwnd);
3061 
3062 	db_print_indent(indent);
3063 	db_printf("snd_ssthresh: %u   snd_recover: "
3064 	    "0x%08x\n", tp->snd_ssthresh, tp->snd_recover);
3065 
3066 	db_print_indent(indent);
3067 	db_printf("t_rcvtime: %u   t_startime: %u\n",
3068 	    tp->t_rcvtime, tp->t_starttime);
3069 
3070 	db_print_indent(indent);
3071 	db_printf("t_rttime: %u   t_rtsq: 0x%08x\n",
3072 	    tp->t_rtttime, tp->t_rtseq);
3073 
3074 	db_print_indent(indent);
3075 	db_printf("t_rxtcur: %d   t_maxseg: %u   t_srtt: %d\n",
3076 	    tp->t_rxtcur, tp->t_maxseg, tp->t_srtt);
3077 
3078 	db_print_indent(indent);
3079 	db_printf("t_rttvar: %d   t_rxtshift: %d   t_rttmin: %u\n",
3080 	    tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin);
3081 
3082 	db_print_indent(indent);
3083 	db_printf("t_rttupdated: %u   max_sndwnd: %u   t_softerror: %d\n",
3084 	    tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror);
3085 
3086 	db_print_indent(indent);
3087 	db_printf("t_oobflags: 0x%x (", tp->t_oobflags);
3088 	db_print_toobflags(tp->t_oobflags);
3089 	db_printf(")   t_iobc: 0x%02x\n", tp->t_iobc);
3090 
3091 	db_print_indent(indent);
3092 	db_printf("snd_scale: %u   rcv_scale: %u   request_r_scale: %u\n",
3093 	    tp->snd_scale, tp->rcv_scale, tp->request_r_scale);
3094 
3095 	db_print_indent(indent);
3096 	db_printf("ts_recent: %u   ts_recent_age: %u\n",
3097 	    tp->ts_recent, tp->ts_recent_age);
3098 
3099 	db_print_indent(indent);
3100 	db_printf("ts_offset: %u   last_ack_sent: 0x%08x   snd_cwnd_prev: "
3101 	    "%u\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev);
3102 
3103 	db_print_indent(indent);
3104 	db_printf("snd_ssthresh_prev: %u   snd_recover_prev: 0x%08x   "
3105 	    "t_badrxtwin: %u\n", tp->snd_ssthresh_prev,
3106 	    tp->snd_recover_prev, tp->t_badrxtwin);
3107 
3108 	db_print_indent(indent);
3109 	db_printf("snd_numholes: %d  snd_holes first: %p\n",
3110 	    tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes));
3111 
3112 	db_print_indent(indent);
3113 	db_printf("snd_fack: 0x%08x   rcv_numsacks: %d\n",
3114 	    tp->snd_fack, tp->rcv_numsacks);
3115 
3116 	/* Skip sackblks, sackhint. */
3117 
3118 	db_print_indent(indent);
3119 	db_printf("t_rttlow: %d   rfbuf_ts: %u   rfbuf_cnt: %d\n",
3120 	    tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt);
3121 }
3122 
3123 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb)
3124 {
3125 	struct tcpcb *tp;
3126 
3127 	if (!have_addr) {
3128 		db_printf("usage: show tcpcb <addr>\n");
3129 		return;
3130 	}
3131 	tp = (struct tcpcb *)addr;
3132 
3133 	db_print_tcpcb(tp, "tcpcb", 0);
3134 }
3135 #endif
3136