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1 /*
2 * Copyright (c) 2000-2017 Apple Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28 /*
29 * Copyright (c) 1982, 1986, 1988, 1993
30 * The Regents of the University of California. All rights reserved.
31 *
32 * Redistribution and use in source and binary forms, with or without
33 * modification, are permitted provided that the following conditions
34 * are met:
35 * 1. Redistributions of source code must retain the above copyright
36 * notice, this list of conditions and the following disclaimer.
37 * 2. Redistributions in binary form must reproduce the above copyright
38 * notice, this list of conditions and the following disclaimer in the
39 * documentation and/or other materials provided with the distribution.
40 * 3. All advertising materials mentioning features or use of this software
41 * must display the following acknowledgement:
42 * This product includes software developed by the University of
43 * California, Berkeley and its contributors.
44 * 4. Neither the name of the University nor the names of its contributors
45 * may be used to endorse or promote products derived from this software
46 * without specific prior written permission.
47 *
48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 * SUCH DAMAGE.
59 *
60 * From: @(#)tcp_usrreq.c 8.2 (Berkeley) 1/3/94
61 * $FreeBSD: src/sys/netinet/tcp_usrreq.c,v 1.51.2.9 2001/08/22 00:59:12 silby Exp $
62 */
63
64
65 #include <sys/param.h>
66 #include <sys/systm.h>
67 #include <sys/kernel.h>
68 #include <sys/sysctl.h>
69 #include <sys/mbuf.h>
70 #if INET6
71 #include <sys/domain.h>
72 #endif /* INET6 */
73 #if !CONFIG_EMBEDDED
74 #include <sys/kasl.h>
75 #endif
76 #include <sys/socket.h>
77 #include <sys/socketvar.h>
78 #include <sys/protosw.h>
79 #include <sys/syslog.h>
80
81 #include <net/if.h>
82 #include <net/route.h>
83 #include <net/ntstat.h>
84 #include <net/content_filter.h>
85
86 #include <netinet/in.h>
87 #include <netinet/in_systm.h>
88 #if INET6
89 #include <netinet/ip6.h>
90 #endif
91 #include <netinet/in_pcb.h>
92 #if INET6
93 #include <netinet6/in6_pcb.h>
94 #endif
95 #include <netinet/in_var.h>
96 #include <netinet/ip_var.h>
97 #if INET6
98 #include <netinet6/ip6_var.h>
99 #endif
100 #include <netinet/tcp.h>
101 #include <netinet/tcp_fsm.h>
102 #include <netinet/tcp_seq.h>
103 #include <netinet/tcp_timer.h>
104 #include <netinet/tcp_var.h>
105 #include <netinet/tcpip.h>
106 #include <netinet/tcp_cc.h>
107 #include <mach/sdt.h>
108 #if TCPDEBUG
109 #include <netinet/tcp_debug.h>
110 #endif
111 #if MPTCP
112 #include <netinet/mptcp_var.h>
113 #endif /* MPTCP */
114
115 #if IPSEC
116 #include <netinet6/ipsec.h>
117 #endif /*IPSEC*/
118
119 #if FLOW_DIVERT
120 #include <netinet/flow_divert.h>
121 #endif /* FLOW_DIVERT */
122
123 errno_t tcp_fill_info_for_info_tuple(struct info_tuple *, struct tcp_info *);
124
125 int tcp_sysctl_info(struct sysctl_oid *, void *, int , struct sysctl_req *);
126 static void tcp_connection_fill_info(struct tcpcb *tp,
127 struct tcp_connection_info *tci);
128
129 /*
130 * TCP protocol interface to socket abstraction.
131 */
132 extern char *tcpstates[]; /* XXX ??? */
133
134 static int tcp_attach(struct socket *, struct proc *);
135 static int tcp_connect(struct tcpcb *, struct sockaddr *, struct proc *);
136 #if INET6
137 static int tcp6_connect(struct tcpcb *, struct sockaddr *, struct proc *);
138 static int tcp6_usr_connect(struct socket *, struct sockaddr *,
139 struct proc *);
140 #endif /* INET6 */
141 static struct tcpcb *tcp_disconnect(struct tcpcb *);
142 static struct tcpcb *tcp_usrclosed(struct tcpcb *);
143 extern void tcp_sbrcv_trim(struct tcpcb *tp, struct sockbuf *sb);
144
145 #if TCPDEBUG
146 #define TCPDEBUG0 int ostate = 0
147 #define TCPDEBUG1() ostate = tp ? tp->t_state : 0
148 #define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \
149 tcp_trace(TA_USER, ostate, tp, 0, 0, req)
150 #else
151 #define TCPDEBUG0
152 #define TCPDEBUG1()
153 #define TCPDEBUG2(req)
154 #endif
155
156 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, info,
157 CTLFLAG_RW | CTLFLAG_LOCKED | CTLFLAG_ANYBODY | CTLFLAG_KERN,
158 0 , 0, tcp_sysctl_info, "S", "TCP info per tuple");
159
160 /*
161 * TCP attaches to socket via pru_attach(), reserving space,
162 * and an internet control block.
163 *
164 * Returns: 0 Success
165 * EISCONN
166 * tcp_attach:ENOBUFS
167 * tcp_attach:ENOMEM
168 * tcp_attach:??? [IPSEC specific]
169 */
170 static int
171 tcp_usr_attach(struct socket *so, __unused int proto, struct proc *p)
172 {
173 int error;
174 struct inpcb *inp = sotoinpcb(so);
175 struct tcpcb *tp = 0;
176 TCPDEBUG0;
177
178 TCPDEBUG1();
179 if (inp) {
180 error = EISCONN;
181 goto out;
182 }
183
184 error = tcp_attach(so, p);
185 if (error)
186 goto out;
187
188 if ((so->so_options & SO_LINGER) && so->so_linger == 0)
189 so->so_linger = TCP_LINGERTIME * hz;
190 tp = sototcpcb(so);
191 out:
192 TCPDEBUG2(PRU_ATTACH);
193 return error;
194 }
195
196 /*
197 * pru_detach() detaches the TCP protocol from the socket.
198 * If the protocol state is non-embryonic, then can't
199 * do this directly: have to initiate a pru_disconnect(),
200 * which may finish later; embryonic TCB's can just
201 * be discarded here.
202 */
203 static int
204 tcp_usr_detach(struct socket *so)
205 {
206 int error = 0;
207 struct inpcb *inp = sotoinpcb(so);
208 struct tcpcb *tp;
209 TCPDEBUG0;
210
211 if (inp == 0 || (inp->inp_state == INPCB_STATE_DEAD)) {
212 return EINVAL; /* XXX */
213 }
214 socket_lock_assert_owned(so);
215 tp = intotcpcb(inp);
216 /* In case we got disconnected from the peer */
217 if (tp == NULL)
218 goto out;
219 TCPDEBUG1();
220
221 calculate_tcp_clock();
222
223 tp = tcp_disconnect(tp);
224 out:
225 TCPDEBUG2(PRU_DETACH);
226 return error;
227 }
228
229 #if NECP
230 #define COMMON_START() TCPDEBUG0; \
231 do { \
232 if (inp == NULL || inp->inp_state == INPCB_STATE_DEAD) \
233 return (EINVAL); \
234 if (necp_socket_should_use_flow_divert(inp)) \
235 return (EPROTOTYPE); \
236 tp = intotcpcb(inp); \
237 TCPDEBUG1(); \
238 calculate_tcp_clock(); \
239 } while (0)
240 #else /* NECP */
241 #define COMMON_START() TCPDEBUG0; \
242 do { \
243 if (inp == NULL || inp->inp_state == INPCB_STATE_DEAD) \
244 return (EINVAL); \
245 tp = intotcpcb(inp); \
246 TCPDEBUG1(); \
247 calculate_tcp_clock(); \
248 } while (0)
249 #endif /* !NECP */
250
251 #define COMMON_END(req) out: TCPDEBUG2(req); return error; goto out
252
253
254 /*
255 * Give the socket an address.
256 *
257 * Returns: 0 Success
258 * EINVAL Invalid argument [COMMON_START]
259 * EAFNOSUPPORT Address family not supported
260 * in_pcbbind:EADDRNOTAVAIL Address not available.
261 * in_pcbbind:EINVAL Invalid argument
262 * in_pcbbind:EAFNOSUPPORT Address family not supported [notdef]
263 * in_pcbbind:EACCES Permission denied
264 * in_pcbbind:EADDRINUSE Address in use
265 * in_pcbbind:EAGAIN Resource unavailable, try again
266 * in_pcbbind:EPERM Operation not permitted
267 */
268 static int
269 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
270 {
271 int error = 0;
272 struct inpcb *inp = sotoinpcb(so);
273 struct tcpcb *tp;
274 struct sockaddr_in *sinp;
275
276 COMMON_START();
277
278 if (nam->sa_family != 0 && nam->sa_family != AF_INET) {
279 error = EAFNOSUPPORT;
280 goto out;
281 }
282
283 /*
284 * Must check for multicast addresses and disallow binding
285 * to them.
286 */
287 sinp = (struct sockaddr_in *)(void *)nam;
288 if (sinp->sin_family == AF_INET &&
289 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
290 error = EAFNOSUPPORT;
291 goto out;
292 }
293 error = in_pcbbind(inp, nam, p);
294 if (error)
295 goto out;
296
297 #if NECP
298 /* Update NECP client with bind result if not in middle of connect */
299 if ((inp->inp_flags2 & INP2_CONNECT_IN_PROGRESS) &&
300 !uuid_is_null(inp->necp_client_uuid)) {
301 socket_unlock(so, 0);
302 necp_client_assign_from_socket(so->last_pid, inp->necp_client_uuid, inp);
303 socket_lock(so, 0);
304 }
305 #endif /* NECP */
306
307 COMMON_END(PRU_BIND);
308
309 }
310
311 #if INET6
312 static int
313 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
314 {
315 int error = 0;
316 struct inpcb *inp = sotoinpcb(so);
317 struct tcpcb *tp;
318 struct sockaddr_in6 *sin6p;
319
320 COMMON_START();
321
322 if (nam->sa_family != 0 && nam->sa_family != AF_INET6) {
323 error = EAFNOSUPPORT;
324 goto out;
325 }
326
327 /*
328 * Must check for multicast addresses and disallow binding
329 * to them.
330 */
331 sin6p = (struct sockaddr_in6 *)(void *)nam;
332 if (sin6p->sin6_family == AF_INET6 &&
333 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
334 error = EAFNOSUPPORT;
335 goto out;
336 }
337 inp->inp_vflag &= ~INP_IPV4;
338 inp->inp_vflag |= INP_IPV6;
339 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
340 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr))
341 inp->inp_vflag |= INP_IPV4;
342 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
343 struct sockaddr_in sin;
344
345 in6_sin6_2_sin(&sin, sin6p);
346 inp->inp_vflag |= INP_IPV4;
347 inp->inp_vflag &= ~INP_IPV6;
348 error = in_pcbbind(inp, (struct sockaddr *)&sin, p);
349 goto out;
350 }
351 }
352 error = in6_pcbbind(inp, nam, p);
353 if (error)
354 goto out;
355 COMMON_END(PRU_BIND);
356 }
357 #endif /* INET6 */
358
359 /*
360 * Prepare to accept connections.
361 *
362 * Returns: 0 Success
363 * EINVAL [COMMON_START]
364 * in_pcbbind:EADDRNOTAVAIL Address not available.
365 * in_pcbbind:EINVAL Invalid argument
366 * in_pcbbind:EAFNOSUPPORT Address family not supported [notdef]
367 * in_pcbbind:EACCES Permission denied
368 * in_pcbbind:EADDRINUSE Address in use
369 * in_pcbbind:EAGAIN Resource unavailable, try again
370 * in_pcbbind:EPERM Operation not permitted
371 */
372 static int
373 tcp_usr_listen(struct socket *so, struct proc *p)
374 {
375 int error = 0;
376 struct inpcb *inp = sotoinpcb(so);
377 struct tcpcb *tp;
378
379 COMMON_START();
380 if (inp->inp_lport == 0)
381 error = in_pcbbind(inp, NULL, p);
382 if (error == 0)
383 tp->t_state = TCPS_LISTEN;
384 COMMON_END(PRU_LISTEN);
385 }
386
387 #if INET6
388 static int
389 tcp6_usr_listen(struct socket *so, struct proc *p)
390 {
391 int error = 0;
392 struct inpcb *inp = sotoinpcb(so);
393 struct tcpcb *tp;
394
395 COMMON_START();
396 if (inp->inp_lport == 0) {
397 inp->inp_vflag &= ~INP_IPV4;
398 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
399 inp->inp_vflag |= INP_IPV4;
400 error = in6_pcbbind(inp, NULL, p);
401 }
402 if (error == 0)
403 tp->t_state = TCPS_LISTEN;
404 COMMON_END(PRU_LISTEN);
405 }
406 #endif /* INET6 */
407
408 static int
409 tcp_connect_complete(struct socket *so)
410 {
411 struct tcpcb *tp = sototcpcb(so);
412 struct inpcb *inp = sotoinpcb(so);
413 int error = 0;
414
415 /* TFO delays the tcp_output until later, when the app calls write() */
416 if (so->so_flags1 & SOF1_PRECONNECT_DATA) {
417 if (!necp_socket_is_allowed_to_send_recv(sotoinpcb(so), NULL, NULL, NULL))
418 return (EHOSTUNREACH);
419
420 /* Initialize enough state so that we can actually send data */
421 tcp_mss(tp, -1, IFSCOPE_NONE);
422 tp->snd_wnd = tp->t_maxseg;
423 tp->max_sndwnd = tp->snd_wnd;
424 } else {
425 error = tcp_output(tp);
426 }
427
428 #if NECP
429 /* Update NECP client with connected five-tuple */
430 if (error == 0 && !uuid_is_null(inp->necp_client_uuid)) {
431 socket_unlock(so, 0);
432 necp_client_assign_from_socket(so->last_pid, inp->necp_client_uuid, inp);
433 socket_lock(so, 0);
434 }
435 #endif /* NECP */
436
437 return (error);
438 }
439
440 /*
441 * Initiate connection to peer.
442 * Create a template for use in transmissions on this connection.
443 * Enter SYN_SENT state, and mark socket as connecting.
444 * Start keep-alive timer, and seed output sequence space.
445 * Send initial segment on connection.
446 */
447 static int
448 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct proc *p)
449 {
450 int error = 0;
451 struct inpcb *inp = sotoinpcb(so);
452 struct tcpcb *tp;
453 struct sockaddr_in *sinp;
454
455 TCPDEBUG0;
456 if (inp == NULL) {
457 return EINVAL;
458 } else if (inp->inp_state == INPCB_STATE_DEAD) {
459 if (so->so_error) {
460 error = so->so_error;
461 so->so_error = 0;
462 return error;
463 } else
464 return EINVAL;
465 }
466 #if NECP
467 #if FLOW_DIVERT
468 else if (necp_socket_should_use_flow_divert(inp)) {
469 uint32_t fd_ctl_unit = necp_socket_get_flow_divert_control_unit(inp);
470 if (fd_ctl_unit > 0) {
471 error = flow_divert_pcb_init(so, fd_ctl_unit);
472 if (error == 0) {
473 error = flow_divert_connect_out(so, nam, p);
474 }
475 } else {
476 error = ENETDOWN;
477 }
478
479 return error;
480 }
481 #endif /* FLOW_DIVERT */
482 #if CONTENT_FILTER
483 error = cfil_sock_attach(so);
484 if (error != 0)
485 return error;
486 #endif /* CONTENT_FILTER */
487 #endif /* NECP */
488 tp = intotcpcb(inp);
489 TCPDEBUG1();
490
491 calculate_tcp_clock();
492
493 if (nam->sa_family != 0 && nam->sa_family != AF_INET) {
494 error = EAFNOSUPPORT;
495 goto out;
496 }
497 /*
498 * Must disallow TCP ``connections'' to multicast addresses.
499 */
500 sinp = (struct sockaddr_in *)(void *)nam;
501 if (sinp->sin_family == AF_INET
502 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
503 error = EAFNOSUPPORT;
504 goto out;
505 }
506
507 if ((error = tcp_connect(tp, nam, p)) != 0)
508 goto out;
509
510 error = tcp_connect_complete(so);
511
512 COMMON_END(PRU_CONNECT);
513 }
514
515 static int
516 tcp_usr_connectx_common(struct socket *so, int af,
517 struct sockaddr *src, struct sockaddr *dst,
518 struct proc *p, uint32_t ifscope, sae_associd_t aid, sae_connid_t *pcid,
519 uint32_t flags, void *arg, uint32_t arglen, struct uio *auio,
520 user_ssize_t *bytes_written)
521 {
522 #pragma unused(aid, flags, arg, arglen)
523 struct inpcb *inp = sotoinpcb(so);
524 int error = 0;
525 user_ssize_t datalen = 0;
526
527 if (inp == NULL)
528 return (EINVAL);
529
530 VERIFY(dst != NULL);
531
532 ASSERT(!(inp->inp_flags2 & INP2_CONNECT_IN_PROGRESS));
533 inp->inp_flags2 |= INP2_CONNECT_IN_PROGRESS;
534
535 #if NECP
536 inp_update_necp_policy(inp, src, dst, ifscope);
537 #endif /* NECP */
538
539 if ((so->so_flags1 & SOF1_DATA_IDEMPOTENT) &&
540 (tcp_fastopen & TCP_FASTOPEN_CLIENT))
541 sototcpcb(so)->t_flagsext |= TF_FASTOPEN;
542
543 /* bind socket to the specified interface, if requested */
544 if (ifscope != IFSCOPE_NONE &&
545 (error = inp_bindif(inp, ifscope, NULL)) != 0) {
546 goto done;
547 }
548
549 /* if source address and/or port is specified, bind to it */
550 if (src != NULL) {
551 error = sobindlock(so, src, 0); /* already locked */
552 if (error != 0) {
553 goto done;
554 }
555 }
556
557 switch (af) {
558 case AF_INET:
559 error = tcp_usr_connect(so, dst, p);
560 break;
561 #if INET6
562 case AF_INET6:
563 error = tcp6_usr_connect(so, dst, p);
564 break;
565 #endif /* INET6 */
566 default:
567 VERIFY(0);
568 /* NOTREACHED */
569 }
570
571 if (error != 0) {
572 goto done;
573 }
574
575 /* if there is data, copy it */
576 if (auio != NULL) {
577 socket_unlock(so, 0);
578
579 VERIFY(bytes_written != NULL);
580
581 datalen = uio_resid(auio);
582 error = so->so_proto->pr_usrreqs->pru_sosend(so, NULL,
583 (uio_t)auio, NULL, NULL, 0);
584 socket_lock(so, 0);
585
586 if (error == 0 || error == EWOULDBLOCK)
587 *bytes_written = datalen - uio_resid(auio);
588
589 /*
590 * sosend returns EWOULDBLOCK if it's a non-blocking
591 * socket or a timeout occured (this allows to return
592 * the amount of queued data through sendit()).
593 *
594 * However, connectx() returns EINPROGRESS in case of a
595 * blocking socket. So we change the return value here.
596 */
597 if (error == EWOULDBLOCK)
598 error = EINPROGRESS;
599 }
600
601 if (error == 0 && pcid != NULL)
602 *pcid = 1; /* there is only one connection in regular TCP */
603
604 done:
605 if (error && error != EINPROGRESS)
606 so->so_flags1 &= ~SOF1_PRECONNECT_DATA;
607
608 inp->inp_flags2 &= ~INP2_CONNECT_IN_PROGRESS;
609 return (error);
610 }
611
612 static int
613 tcp_usr_connectx(struct socket *so, struct sockaddr *src,
614 struct sockaddr *dst, struct proc *p, uint32_t ifscope,
615 sae_associd_t aid, sae_connid_t *pcid, uint32_t flags, void *arg,
616 uint32_t arglen, struct uio *uio, user_ssize_t *bytes_written)
617 {
618 return (tcp_usr_connectx_common(so, AF_INET, src, dst, p, ifscope, aid,
619 pcid, flags, arg, arglen, uio, bytes_written));
620 }
621
622 #if INET6
623 static int
624 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct proc *p)
625 {
626 int error = 0;
627 struct inpcb *inp = sotoinpcb(so);
628 struct tcpcb *tp;
629 struct sockaddr_in6 *sin6p;
630
631 TCPDEBUG0;
632 if (inp == NULL) {
633 return EINVAL;
634 } else if (inp->inp_state == INPCB_STATE_DEAD) {
635 if (so->so_error) {
636 error = so->so_error;
637 so->so_error = 0;
638 return error;
639 } else
640 return EINVAL;
641 }
642 #if NECP
643 #if FLOW_DIVERT
644 else if (necp_socket_should_use_flow_divert(inp)) {
645 uint32_t fd_ctl_unit = necp_socket_get_flow_divert_control_unit(inp);
646 if (fd_ctl_unit > 0) {
647 error = flow_divert_pcb_init(so, fd_ctl_unit);
648 if (error == 0) {
649 error = flow_divert_connect_out(so, nam, p);
650 }
651 } else {
652 error = ENETDOWN;
653 }
654
655 return error;
656 }
657 #endif /* FLOW_DIVERT */
658 #if CONTENT_FILTER
659 error = cfil_sock_attach(so);
660 if (error != 0)
661 return error;
662 #endif /* CONTENT_FILTER */
663 #endif /* NECP */
664
665 tp = intotcpcb(inp);
666 TCPDEBUG1();
667
668 calculate_tcp_clock();
669
670 if (nam->sa_family != 0 && nam->sa_family != AF_INET6) {
671 error = EAFNOSUPPORT;
672 goto out;
673 }
674
675 /*
676 * Must disallow TCP ``connections'' to multicast addresses.
677 */
678 sin6p = (struct sockaddr_in6 *)(void *)nam;
679 if (sin6p->sin6_family == AF_INET6
680 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
681 error = EAFNOSUPPORT;
682 goto out;
683 }
684
685 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
686 struct sockaddr_in sin;
687
688 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0)
689 return (EINVAL);
690
691 in6_sin6_2_sin(&sin, sin6p);
692 inp->inp_vflag |= INP_IPV4;
693 inp->inp_vflag &= ~INP_IPV6;
694 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, p)) != 0)
695 goto out;
696
697 error = tcp_connect_complete(so);
698 goto out;
699 }
700 inp->inp_vflag &= ~INP_IPV4;
701 inp->inp_vflag |= INP_IPV6;
702 if ((error = tcp6_connect(tp, nam, p)) != 0)
703 goto out;
704
705 error = tcp_connect_complete(so);
706 COMMON_END(PRU_CONNECT);
707 }
708
709 static int
710 tcp6_usr_connectx(struct socket *so, struct sockaddr*src,
711 struct sockaddr *dst, struct proc *p, uint32_t ifscope,
712 sae_associd_t aid, sae_connid_t *pcid, uint32_t flags, void *arg,
713 uint32_t arglen, struct uio *uio, user_ssize_t *bytes_written)
714 {
715 return (tcp_usr_connectx_common(so, AF_INET6, src, dst, p, ifscope, aid,
716 pcid, flags, arg, arglen, uio, bytes_written));
717 }
718 #endif /* INET6 */
719
720 /*
721 * Initiate disconnect from peer.
722 * If connection never passed embryonic stage, just drop;
723 * else if don't need to let data drain, then can just drop anyways,
724 * else have to begin TCP shutdown process: mark socket disconnecting,
725 * drain unread data, state switch to reflect user close, and
726 * send segment (e.g. FIN) to peer. Socket will be really disconnected
727 * when peer sends FIN and acks ours.
728 *
729 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
730 */
731 static int
732 tcp_usr_disconnect(struct socket *so)
733 {
734 int error = 0;
735 struct inpcb *inp = sotoinpcb(so);
736 struct tcpcb *tp;
737
738 socket_lock_assert_owned(so);
739 COMMON_START();
740 /* In case we got disconnected from the peer */
741 if (tp == NULL)
742 goto out;
743 tp = tcp_disconnect(tp);
744 COMMON_END(PRU_DISCONNECT);
745 }
746
747 /*
748 * User-protocol pru_disconnectx callback.
749 */
750 static int
751 tcp_usr_disconnectx(struct socket *so, sae_associd_t aid, sae_connid_t cid)
752 {
753 #pragma unused(cid)
754 if (aid != SAE_ASSOCID_ANY && aid != SAE_ASSOCID_ALL)
755 return (EINVAL);
756
757 return (tcp_usr_disconnect(so));
758 }
759
760 /*
761 * Accept a connection. Essentially all the work is
762 * done at higher levels; just return the address
763 * of the peer, storing through addr.
764 */
765 static int
766 tcp_usr_accept(struct socket *so, struct sockaddr **nam)
767 {
768 int error = 0;
769 struct inpcb *inp = sotoinpcb(so);
770 struct tcpcb *tp = NULL;
771 TCPDEBUG0;
772
773 in_getpeeraddr(so, nam);
774
775 if (so->so_state & SS_ISDISCONNECTED) {
776 error = ECONNABORTED;
777 goto out;
778 }
779 if (inp == NULL || inp->inp_state == INPCB_STATE_DEAD)
780 return (EINVAL);
781 #if NECP
782 else if (necp_socket_should_use_flow_divert(inp))
783 return (EPROTOTYPE);
784 #if CONTENT_FILTER
785 error = cfil_sock_attach(so);
786 if (error != 0)
787 return (error);
788 #endif /* CONTENT_FILTER */
789 #endif /* NECP */
790
791 tp = intotcpcb(inp);
792 TCPDEBUG1();
793
794 calculate_tcp_clock();
795
796 COMMON_END(PRU_ACCEPT);
797 }
798
799 #if INET6
800 static int
801 tcp6_usr_accept(struct socket *so, struct sockaddr **nam)
802 {
803 int error = 0;
804 struct inpcb *inp = sotoinpcb(so);
805 struct tcpcb *tp = NULL;
806 TCPDEBUG0;
807
808 if (so->so_state & SS_ISDISCONNECTED) {
809 error = ECONNABORTED;
810 goto out;
811 }
812 if (inp == NULL || inp->inp_state == INPCB_STATE_DEAD)
813 return (EINVAL);
814 #if NECP
815 else if (necp_socket_should_use_flow_divert(inp))
816 return (EPROTOTYPE);
817 #if CONTENT_FILTER
818 error = cfil_sock_attach(so);
819 if (error != 0)
820 return (error);
821 #endif /* CONTENT_FILTER */
822 #endif /* NECP */
823
824 tp = intotcpcb(inp);
825 TCPDEBUG1();
826
827 calculate_tcp_clock();
828
829 in6_mapped_peeraddr(so, nam);
830 COMMON_END(PRU_ACCEPT);
831 }
832 #endif /* INET6 */
833
834 /*
835 * Mark the connection as being incapable of further output.
836 *
837 * Returns: 0 Success
838 * EINVAL [COMMON_START]
839 * tcp_output:EADDRNOTAVAIL
840 * tcp_output:ENOBUFS
841 * tcp_output:EMSGSIZE
842 * tcp_output:EHOSTUNREACH
843 * tcp_output:ENETUNREACH
844 * tcp_output:ENETDOWN
845 * tcp_output:ENOMEM
846 * tcp_output:EACCES
847 * tcp_output:EMSGSIZE
848 * tcp_output:ENOBUFS
849 * tcp_output:??? [ignorable: mostly IPSEC/firewall/DLIL]
850 */
851 static int
852 tcp_usr_shutdown(struct socket *so)
853 {
854 int error = 0;
855 struct inpcb *inp = sotoinpcb(so);
856 struct tcpcb *tp;
857
858 TCPDEBUG0;
859 if (inp == NULL || inp->inp_state == INPCB_STATE_DEAD)
860 return (EINVAL);
861
862 socantsendmore(so);
863
864 /*
865 * In case we got disconnected from the peer, or if this is
866 * a socket that is to be flow-diverted (but not yet).
867 */
868 tp = intotcpcb(inp);
869 TCPDEBUG1();
870
871 if (tp == NULL
872 #if NECP
873 || (necp_socket_should_use_flow_divert(inp))
874 #endif /* NECP */
875 ) {
876 if (tp != NULL)
877 error = EPROTOTYPE;
878 goto out;
879 }
880
881 calculate_tcp_clock();
882
883 tp = tcp_usrclosed(tp);
884 #if MPTCP
885 /* A reset has been sent but socket exists, do not send FIN */
886 if ((so->so_flags & SOF_MP_SUBFLOW) &&
887 (tp) && (tp->t_mpflags & TMPF_RESET)) {
888 goto out;
889 }
890 #endif
891 #if CONTENT_FILTER
892 /* Don't send a FIN yet */
893 if (tp && !(so->so_state & SS_ISDISCONNECTED) &&
894 cfil_sock_data_pending(&so->so_snd))
895 goto out;
896 #endif /* CONTENT_FILTER */
897 if (tp)
898 error = tcp_output(tp);
899 COMMON_END(PRU_SHUTDOWN);
900 }
901
902 /*
903 * After a receive, possibly send window update to peer.
904 */
905 static int
906 tcp_usr_rcvd(struct socket *so, __unused int flags)
907 {
908 int error = 0;
909 struct inpcb *inp = sotoinpcb(so);
910 struct tcpcb *tp;
911
912 COMMON_START();
913 /* In case we got disconnected from the peer */
914 if (tp == NULL)
915 goto out;
916 tcp_sbrcv_trim(tp, &so->so_rcv);
917
918 /*
919 * This tcp_output is solely there to trigger window-updates.
920 * However, we really do not want these window-updates while we
921 * are still in SYN_SENT or SYN_RECEIVED.
922 */
923 if (TCPS_HAVEESTABLISHED(tp->t_state))
924 tcp_output(tp);
925
926 #if CONTENT_FILTER
927 cfil_sock_buf_update(&so->so_rcv);
928 #endif /* CONTENT_FILTER */
929
930 COMMON_END(PRU_RCVD);
931 }
932
933 /*
934 * Do a send by putting data in output queue and updating urgent
935 * marker if URG set. Possibly send more data. Unlike the other
936 * pru_*() routines, the mbuf chains are our responsibility. We
937 * must either enqueue them or free them. The other pru_* routines
938 * generally are caller-frees.
939 *
940 * Returns: 0 Success
941 * ECONNRESET
942 * EINVAL
943 * ENOBUFS
944 * tcp_connect:EADDRINUSE Address in use
945 * tcp_connect:EADDRNOTAVAIL Address not available.
946 * tcp_connect:EINVAL Invalid argument
947 * tcp_connect:EAFNOSUPPORT Address family not supported [notdef]
948 * tcp_connect:EACCES Permission denied
949 * tcp_connect:EAGAIN Resource unavailable, try again
950 * tcp_connect:EPERM Operation not permitted
951 * tcp_output:EADDRNOTAVAIL
952 * tcp_output:ENOBUFS
953 * tcp_output:EMSGSIZE
954 * tcp_output:EHOSTUNREACH
955 * tcp_output:ENETUNREACH
956 * tcp_output:ENETDOWN
957 * tcp_output:ENOMEM
958 * tcp_output:EACCES
959 * tcp_output:EMSGSIZE
960 * tcp_output:ENOBUFS
961 * tcp_output:??? [ignorable: mostly IPSEC/firewall/DLIL]
962 * tcp6_connect:??? [IPV6 only]
963 */
964 static int
965 tcp_usr_send(struct socket *so, int flags, struct mbuf *m,
966 struct sockaddr *nam, struct mbuf *control, struct proc *p)
967 {
968 int error = 0;
969 struct inpcb *inp = sotoinpcb(so);
970 struct tcpcb *tp;
971 uint32_t msgpri = MSG_PRI_DEFAULT;
972 #if INET6
973 int isipv6;
974 #endif
975 TCPDEBUG0;
976
977 if (inp == NULL || inp->inp_state == INPCB_STATE_DEAD
978 #if NECP
979 || (necp_socket_should_use_flow_divert(inp))
980 #endif /* NECP */
981 ) {
982 /*
983 * OOPS! we lost a race, the TCP session got reset after
984 * we checked SS_CANTSENDMORE, eg: while doing uiomove or a
985 * network interrupt in the non-splnet() section of sosend().
986 */
987 if (m != NULL)
988 m_freem(m);
989 if (control != NULL) {
990 m_freem(control);
991 control = NULL;
992 }
993
994 if (inp == NULL)
995 error = ECONNRESET; /* XXX EPIPE? */
996 else
997 error = EPROTOTYPE;
998 tp = NULL;
999 TCPDEBUG1();
1000 goto out;
1001 }
1002 #if INET6
1003 isipv6 = nam && nam->sa_family == AF_INET6;
1004 #endif /* INET6 */
1005 tp = intotcpcb(inp);
1006 TCPDEBUG1();
1007
1008 calculate_tcp_clock();
1009
1010 if (control != NULL) {
1011 if (so->so_flags & SOF_ENABLE_MSGS) {
1012 /* Get the msg priority from control mbufs */
1013 error = tcp_get_msg_priority(control, &msgpri);
1014 if (error) {
1015 m_freem(control);
1016 if (m != NULL)
1017 m_freem(m);
1018 control = NULL;
1019 m = NULL;
1020 goto out;
1021 }
1022 m_freem(control);
1023 control = NULL;
1024 } else if (control->m_len) {
1025 /*
1026 * if not unordered, TCP should not have
1027 * control mbufs
1028 */
1029 m_freem(control);
1030 if (m != NULL)
1031 m_freem(m);
1032 control = NULL;
1033 m = NULL;
1034 error = EINVAL;
1035 goto out;
1036 }
1037 }
1038
1039 if (so->so_flags & SOF_ENABLE_MSGS) {
1040 VERIFY(m->m_flags & M_PKTHDR);
1041 m->m_pkthdr.msg_pri = msgpri;
1042 }
1043
1044 /* MPTCP sublow socket buffers must not be compressed */
1045 VERIFY(!(so->so_flags & SOF_MP_SUBFLOW) ||
1046 (so->so_snd.sb_flags & SB_NOCOMPRESS));
1047
1048 if(!(flags & PRUS_OOB) || (so->so_flags1 & SOF1_PRECONNECT_DATA)) {
1049 /* Call msg send if message delivery is enabled */
1050 if (so->so_flags & SOF_ENABLE_MSGS)
1051 sbappendmsg_snd(&so->so_snd, m);
1052 else
1053 sbappendstream(&so->so_snd, m);
1054
1055 if (nam && tp->t_state < TCPS_SYN_SENT) {
1056
1057 /*
1058 * Do implied connect if not yet connected,
1059 * initialize window to default value, and
1060 * initialize maxseg/maxopd using peer's cached
1061 * MSS.
1062 */
1063 #if INET6
1064 if (isipv6)
1065 error = tcp6_connect(tp, nam, p);
1066 else
1067 #endif /* INET6 */
1068 error = tcp_connect(tp, nam, p);
1069 if (error)
1070 goto out;
1071 tp->snd_wnd = TTCP_CLIENT_SND_WND;
1072 tp->max_sndwnd = tp->snd_wnd;
1073 tcp_mss(tp, -1, IFSCOPE_NONE);
1074 }
1075
1076 if (flags & PRUS_EOF) {
1077 /*
1078 * Close the send side of the connection after
1079 * the data is sent.
1080 */
1081 socantsendmore(so);
1082 tp = tcp_usrclosed(tp);
1083 }
1084 if (tp != NULL) {
1085 if (flags & PRUS_MORETOCOME)
1086 tp->t_flags |= TF_MORETOCOME;
1087 error = tcp_output(tp);
1088 if (flags & PRUS_MORETOCOME)
1089 tp->t_flags &= ~TF_MORETOCOME;
1090 }
1091 } else {
1092 if (sbspace(&so->so_snd) == 0) {
1093 /* if no space is left in sockbuf,
1094 * do not try to squeeze in OOB traffic */
1095 m_freem(m);
1096 error = ENOBUFS;
1097 goto out;
1098 }
1099 /*
1100 * According to RFC961 (Assigned Protocols),
1101 * the urgent pointer points to the last octet
1102 * of urgent data. We continue, however,
1103 * to consider it to indicate the first octet
1104 * of data past the urgent section.
1105 * Otherwise, snd_up should be one lower.
1106 */
1107 sbappendstream(&so->so_snd, m);
1108 if (nam && tp->t_state < TCPS_SYN_SENT) {
1109 /*
1110 * Do implied connect if not yet connected,
1111 * initialize window to default value, and
1112 * initialize maxseg/maxopd using peer's cached
1113 * MSS.
1114 */
1115 #if INET6
1116 if (isipv6)
1117 error = tcp6_connect(tp, nam, p);
1118 else
1119 #endif /* INET6 */
1120 error = tcp_connect(tp, nam, p);
1121 if (error)
1122 goto out;
1123 tp->snd_wnd = TTCP_CLIENT_SND_WND;
1124 tp->max_sndwnd = tp->snd_wnd;
1125 tcp_mss(tp, -1, IFSCOPE_NONE);
1126 }
1127 tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
1128 tp->t_flagsext |= TF_FORCE;
1129 error = tcp_output(tp);
1130 tp->t_flagsext &= ~TF_FORCE;
1131 }
1132
1133
1134 /*
1135 * We wait for the socket to successfully connect before returning.
1136 * This allows us to signal a timeout to the application.
1137 */
1138 if (so->so_state & SS_ISCONNECTING) {
1139 if (so->so_state & SS_NBIO)
1140 error = EWOULDBLOCK;
1141 else
1142 error = sbwait(&so->so_snd);
1143 }
1144
1145 COMMON_END((flags & PRUS_OOB) ? PRU_SENDOOB :
1146 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
1147 }
1148
1149 /*
1150 * Abort the TCP.
1151 */
1152 static int
1153 tcp_usr_abort(struct socket *so)
1154 {
1155 int error = 0;
1156 struct inpcb *inp = sotoinpcb(so);
1157 struct tcpcb *tp;
1158
1159 COMMON_START();
1160 /* In case we got disconnected from the peer */
1161 if (tp == NULL)
1162 goto out;
1163 tp = tcp_drop(tp, ECONNABORTED);
1164 VERIFY(so->so_usecount > 0);
1165 so->so_usecount--;
1166 COMMON_END(PRU_ABORT);
1167 }
1168
1169 /*
1170 * Receive out-of-band data.
1171 *
1172 * Returns: 0 Success
1173 * EINVAL [COMMON_START]
1174 * EINVAL
1175 * EWOULDBLOCK
1176 */
1177 static int
1178 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags)
1179 {
1180 int error = 0;
1181 struct inpcb *inp = sotoinpcb(so);
1182 struct tcpcb *tp;
1183
1184 COMMON_START();
1185 if ((so->so_oobmark == 0 &&
1186 (so->so_state & SS_RCVATMARK) == 0) ||
1187 so->so_options & SO_OOBINLINE ||
1188 tp->t_oobflags & TCPOOB_HADDATA) {
1189 error = EINVAL;
1190 goto out;
1191 }
1192 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
1193 error = EWOULDBLOCK;
1194 goto out;
1195 }
1196 m->m_len = 1;
1197 *mtod(m, caddr_t) = tp->t_iobc;
1198 so->so_state &= ~SS_RCVATMARK;
1199 if ((flags & MSG_PEEK) == 0)
1200 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
1201 COMMON_END(PRU_RCVOOB);
1202 }
1203
1204 static int
1205 tcp_usr_preconnect(struct socket *so)
1206 {
1207 struct inpcb *inp = sotoinpcb(so);
1208 int error = 0;
1209
1210 #if NECP
1211 if (necp_socket_should_use_flow_divert(inp)) {
1212 /* May happen, if in tcp_usr_connect we did not had a chance
1213 * to set the usrreqs (due to some error). So, let's get out
1214 * of here.
1215 */
1216 goto out;
1217 }
1218 #endif /* NECP */
1219
1220 error = tcp_output(sototcpcb(so));
1221
1222 soclearfastopen(so);
1223
1224 COMMON_END(PRU_PRECONNECT);
1225 }
1226
1227 /* xxx - should be const */
1228 struct pr_usrreqs tcp_usrreqs = {
1229 .pru_abort = tcp_usr_abort,
1230 .pru_accept = tcp_usr_accept,
1231 .pru_attach = tcp_usr_attach,
1232 .pru_bind = tcp_usr_bind,
1233 .pru_connect = tcp_usr_connect,
1234 .pru_connectx = tcp_usr_connectx,
1235 .pru_control = in_control,
1236 .pru_detach = tcp_usr_detach,
1237 .pru_disconnect = tcp_usr_disconnect,
1238 .pru_disconnectx = tcp_usr_disconnectx,
1239 .pru_listen = tcp_usr_listen,
1240 .pru_peeraddr = in_getpeeraddr,
1241 .pru_rcvd = tcp_usr_rcvd,
1242 .pru_rcvoob = tcp_usr_rcvoob,
1243 .pru_send = tcp_usr_send,
1244 .pru_shutdown = tcp_usr_shutdown,
1245 .pru_sockaddr = in_getsockaddr,
1246 .pru_sosend = sosend,
1247 .pru_soreceive = soreceive,
1248 .pru_preconnect = tcp_usr_preconnect,
1249 };
1250
1251 #if INET6
1252 struct pr_usrreqs tcp6_usrreqs = {
1253 .pru_abort = tcp_usr_abort,
1254 .pru_accept = tcp6_usr_accept,
1255 .pru_attach = tcp_usr_attach,
1256 .pru_bind = tcp6_usr_bind,
1257 .pru_connect = tcp6_usr_connect,
1258 .pru_connectx = tcp6_usr_connectx,
1259 .pru_control = in6_control,
1260 .pru_detach = tcp_usr_detach,
1261 .pru_disconnect = tcp_usr_disconnect,
1262 .pru_disconnectx = tcp_usr_disconnectx,
1263 .pru_listen = tcp6_usr_listen,
1264 .pru_peeraddr = in6_mapped_peeraddr,
1265 .pru_rcvd = tcp_usr_rcvd,
1266 .pru_rcvoob = tcp_usr_rcvoob,
1267 .pru_send = tcp_usr_send,
1268 .pru_shutdown = tcp_usr_shutdown,
1269 .pru_sockaddr = in6_mapped_sockaddr,
1270 .pru_sosend = sosend,
1271 .pru_soreceive = soreceive,
1272 .pru_preconnect = tcp_usr_preconnect,
1273 };
1274 #endif /* INET6 */
1275
1276 /*
1277 * Common subroutine to open a TCP connection to remote host specified
1278 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local
1279 * port number if needed. Call in_pcbladdr to do the routing and to choose
1280 * a local host address (interface). If there is an existing incarnation
1281 * of the same connection in TIME-WAIT state and if the remote host was
1282 * sending CC options and if the connection duration was < MSL, then
1283 * truncate the previous TIME-WAIT state and proceed.
1284 * Initialize connection parameters and enter SYN-SENT state.
1285 *
1286 * Returns: 0 Success
1287 * EADDRINUSE
1288 * EINVAL
1289 * in_pcbbind:EADDRNOTAVAIL Address not available.
1290 * in_pcbbind:EINVAL Invalid argument
1291 * in_pcbbind:EAFNOSUPPORT Address family not supported [notdef]
1292 * in_pcbbind:EACCES Permission denied
1293 * in_pcbbind:EADDRINUSE Address in use
1294 * in_pcbbind:EAGAIN Resource unavailable, try again
1295 * in_pcbbind:EPERM Operation not permitted
1296 * in_pcbladdr:EINVAL Invalid argument
1297 * in_pcbladdr:EAFNOSUPPORT Address family not supported
1298 * in_pcbladdr:EADDRNOTAVAIL Address not available
1299 */
1300 static int
1301 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct proc *p)
1302 {
1303 struct inpcb *inp = tp->t_inpcb, *oinp;
1304 struct socket *so = inp->inp_socket;
1305 struct tcpcb *otp;
1306 struct sockaddr_in *sin = (struct sockaddr_in *)(void *)nam;
1307 struct in_addr laddr;
1308 int error = 0;
1309 struct ifnet *outif = NULL;
1310
1311 if (inp->inp_lport == 0) {
1312 error = in_pcbbind(inp, NULL, p);
1313 if (error)
1314 goto done;
1315 }
1316
1317 /*
1318 * Cannot simply call in_pcbconnect, because there might be an
1319 * earlier incarnation of this same connection still in
1320 * TIME_WAIT state, creating an ADDRINUSE error.
1321 */
1322 error = in_pcbladdr(inp, nam, &laddr, IFSCOPE_NONE, &outif, 0);
1323 if (error)
1324 goto done;
1325
1326 socket_unlock(inp->inp_socket, 0);
1327 oinp = in_pcblookup_hash(inp->inp_pcbinfo,
1328 sin->sin_addr, sin->sin_port,
1329 inp->inp_laddr.s_addr != INADDR_ANY ? inp->inp_laddr : laddr,
1330 inp->inp_lport, 0, NULL);
1331
1332 socket_lock(inp->inp_socket, 0);
1333 if (oinp) {
1334 if (oinp != inp) /* 4143933: avoid deadlock if inp == oinp */
1335 socket_lock(oinp->inp_socket, 1);
1336 if (in_pcb_checkstate(oinp, WNT_RELEASE, 1) == WNT_STOPUSING) {
1337 if (oinp != inp)
1338 socket_unlock(oinp->inp_socket, 1);
1339 goto skip_oinp;
1340 }
1341
1342 if (oinp != inp && (otp = intotcpcb(oinp)) != NULL &&
1343 otp->t_state == TCPS_TIME_WAIT &&
1344 ((int)(tcp_now - otp->t_starttime)) < tcp_msl &&
1345 (otp->t_flags & TF_RCVD_CC)) {
1346 otp = tcp_close(otp);
1347 } else {
1348 printf("tcp_connect: inp=0x%llx err=EADDRINUSE\n",
1349 (uint64_t)VM_KERNEL_ADDRPERM(inp));
1350 if (oinp != inp)
1351 socket_unlock(oinp->inp_socket, 1);
1352 error = EADDRINUSE;
1353 goto done;
1354 }
1355 if (oinp != inp)
1356 socket_unlock(oinp->inp_socket, 1);
1357 }
1358 skip_oinp:
1359 if ((inp->inp_laddr.s_addr == INADDR_ANY ? laddr.s_addr :
1360 inp->inp_laddr.s_addr) == sin->sin_addr.s_addr &&
1361 inp->inp_lport == sin->sin_port) {
1362 error = EINVAL;
1363 goto done;
1364 }
1365 if (!lck_rw_try_lock_exclusive(inp->inp_pcbinfo->ipi_lock)) {
1366 /*lock inversion issue, mostly with udp multicast packets */
1367 socket_unlock(inp->inp_socket, 0);
1368 lck_rw_lock_exclusive(inp->inp_pcbinfo->ipi_lock);
1369 socket_lock(inp->inp_socket, 0);
1370 }
1371 if (inp->inp_laddr.s_addr == INADDR_ANY) {
1372 inp->inp_laddr = laddr;
1373 /* no reference needed */
1374 inp->inp_last_outifp = outif;
1375
1376 inp->inp_flags |= INP_INADDR_ANY;
1377 }
1378 inp->inp_faddr = sin->sin_addr;
1379 inp->inp_fport = sin->sin_port;
1380 in_pcbrehash(inp);
1381 lck_rw_done(inp->inp_pcbinfo->ipi_lock);
1382
1383 if (inp->inp_flowhash == 0)
1384 inp->inp_flowhash = inp_calc_flowhash(inp);
1385
1386 tcp_set_max_rwinscale(tp, so, outif);
1387
1388 soisconnecting(so);
1389 tcpstat.tcps_connattempt++;
1390 tp->t_state = TCPS_SYN_SENT;
1391 tp->t_timer[TCPT_KEEP] = OFFSET_FROM_START(tp, TCP_CONN_KEEPINIT(tp));
1392 tp->iss = tcp_new_isn(tp);
1393 tcp_sendseqinit(tp);
1394 if (nstat_collect)
1395 nstat_route_connect_attempt(inp->inp_route.ro_rt);
1396
1397 done:
1398 if (outif != NULL)
1399 ifnet_release(outif);
1400
1401 return (error);
1402 }
1403
1404 #if INET6
1405 static int
1406 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct proc *p)
1407 {
1408 struct inpcb *inp = tp->t_inpcb, *oinp;
1409 struct socket *so = inp->inp_socket;
1410 struct tcpcb *otp;
1411 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)(void *)nam;
1412 struct in6_addr addr6;
1413 int error = 0;
1414 struct ifnet *outif = NULL;
1415
1416 if (inp->inp_lport == 0) {
1417 error = in6_pcbbind(inp, NULL, p);
1418 if (error)
1419 goto done;
1420 }
1421
1422 /*
1423 * Cannot simply call in_pcbconnect, because there might be an
1424 * earlier incarnation of this same connection still in
1425 * TIME_WAIT state, creating an ADDRINUSE error.
1426 *
1427 * in6_pcbladdr() might return an ifp with its reference held
1428 * even in the error case, so make sure that it's released
1429 * whenever it's non-NULL.
1430 */
1431 error = in6_pcbladdr(inp, nam, &addr6, &outif);
1432 if (error)
1433 goto done;
1434 socket_unlock(inp->inp_socket, 0);
1435 oinp = in6_pcblookup_hash(inp->inp_pcbinfo,
1436 &sin6->sin6_addr, sin6->sin6_port,
1437 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
1438 ? &addr6
1439 : &inp->in6p_laddr,
1440 inp->inp_lport, 0, NULL);
1441 socket_lock(inp->inp_socket, 0);
1442 if (oinp) {
1443 if (oinp != inp && (otp = intotcpcb(oinp)) != NULL &&
1444 otp->t_state == TCPS_TIME_WAIT &&
1445 ((int)(tcp_now - otp->t_starttime)) < tcp_msl &&
1446 (otp->t_flags & TF_RCVD_CC)) {
1447 otp = tcp_close(otp);
1448 } else {
1449 error = EADDRINUSE;
1450 goto done;
1451 }
1452 }
1453 if (!lck_rw_try_lock_exclusive(inp->inp_pcbinfo->ipi_lock)) {
1454 /*lock inversion issue, mostly with udp multicast packets */
1455 socket_unlock(inp->inp_socket, 0);
1456 lck_rw_lock_exclusive(inp->inp_pcbinfo->ipi_lock);
1457 socket_lock(inp->inp_socket, 0);
1458 }
1459 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
1460 inp->in6p_laddr = addr6;
1461 inp->in6p_last_outifp = outif; /* no reference needed */
1462 inp->in6p_flags |= INP_IN6ADDR_ANY;
1463 }
1464 inp->in6p_faddr = sin6->sin6_addr;
1465 inp->inp_fport = sin6->sin6_port;
1466 if ((sin6->sin6_flowinfo & IPV6_FLOWINFO_MASK) != 0)
1467 inp->inp_flow = sin6->sin6_flowinfo;
1468 in_pcbrehash(inp);
1469 lck_rw_done(inp->inp_pcbinfo->ipi_lock);
1470
1471 if (inp->inp_flowhash == 0)
1472 inp->inp_flowhash = inp_calc_flowhash(inp);
1473 /* update flowinfo - RFC 6437 */
1474 if (inp->inp_flow == 0 && inp->in6p_flags & IN6P_AUTOFLOWLABEL) {
1475 inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
1476 inp->inp_flow |=
1477 (htonl(inp->inp_flowhash) & IPV6_FLOWLABEL_MASK);
1478 }
1479
1480 tcp_set_max_rwinscale(tp, so, outif);
1481
1482 soisconnecting(so);
1483 tcpstat.tcps_connattempt++;
1484 tp->t_state = TCPS_SYN_SENT;
1485 tp->t_timer[TCPT_KEEP] = OFFSET_FROM_START(tp,
1486 TCP_CONN_KEEPINIT(tp));
1487 tp->iss = tcp_new_isn(tp);
1488 tcp_sendseqinit(tp);
1489 if (nstat_collect)
1490 nstat_route_connect_attempt(inp->inp_route.ro_rt);
1491
1492 done:
1493 if (outif != NULL)
1494 ifnet_release(outif);
1495
1496 return (error);
1497 }
1498 #endif /* INET6 */
1499
1500 /*
1501 * Export TCP internal state information via a struct tcp_info
1502 */
1503 void
1504 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti)
1505 {
1506 struct inpcb *inp = tp->t_inpcb;
1507
1508 bzero(ti, sizeof(*ti));
1509
1510 ti->tcpi_state = tp->t_state;
1511 ti->tcpi_flowhash = inp->inp_flowhash;
1512
1513 if (tp->t_state > TCPS_LISTEN) {
1514 if (TSTMP_SUPPORTED(tp))
1515 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS;
1516 if (SACK_ENABLED(tp))
1517 ti->tcpi_options |= TCPI_OPT_SACK;
1518 if (TCP_WINDOW_SCALE_ENABLED(tp)) {
1519 ti->tcpi_options |= TCPI_OPT_WSCALE;
1520 ti->tcpi_snd_wscale = tp->snd_scale;
1521 ti->tcpi_rcv_wscale = tp->rcv_scale;
1522 }
1523 if (TCP_ECN_ENABLED(tp))
1524 ti->tcpi_options |= TCPI_OPT_ECN;
1525
1526 /* Are we in retranmission episode */
1527 if (IN_FASTRECOVERY(tp) || tp->t_rxtshift > 0)
1528 ti->tcpi_flags |= TCPI_FLAG_LOSSRECOVERY;
1529
1530 if (tp->t_flags & TF_STREAMING_ON)
1531 ti->tcpi_flags |= TCPI_FLAG_STREAMING_ON;
1532
1533 ti->tcpi_rto = tp->t_timer[TCPT_REXMT] ? tp->t_rxtcur : 0;
1534 ti->tcpi_snd_mss = tp->t_maxseg;
1535 ti->tcpi_rcv_mss = tp->t_maxseg;
1536
1537 ti->tcpi_rttcur = tp->t_rttcur;
1538 ti->tcpi_srtt = tp->t_srtt >> TCP_RTT_SHIFT;
1539 ti->tcpi_rttvar = tp->t_rttvar >> TCP_RTTVAR_SHIFT;
1540 ti->tcpi_rttbest = tp->t_rttbest >> TCP_RTT_SHIFT;
1541
1542 ti->tcpi_snd_ssthresh = tp->snd_ssthresh;
1543 ti->tcpi_snd_cwnd = tp->snd_cwnd;
1544 ti->tcpi_snd_sbbytes = inp->inp_socket->so_snd.sb_cc;
1545
1546 ti->tcpi_rcv_space = tp->rcv_wnd;
1547
1548 ti->tcpi_snd_wnd = tp->snd_wnd;
1549 ti->tcpi_snd_nxt = tp->snd_nxt;
1550 ti->tcpi_rcv_nxt = tp->rcv_nxt;
1551
1552 /* convert bytes/msec to bits/sec */
1553 if ((tp->t_flagsext & TF_MEASURESNDBW) != 0 &&
1554 tp->t_bwmeas != NULL) {
1555 ti->tcpi_snd_bw = (tp->t_bwmeas->bw_sndbw * 8000);
1556 }
1557
1558 ti->tcpi_last_outif = (tp->t_inpcb->inp_last_outifp == NULL) ? 0 :
1559 tp->t_inpcb->inp_last_outifp->if_index;
1560
1561 //atomic_get_64(ti->tcpi_txbytes, &inp->inp_stat->txbytes);
1562 ti->tcpi_txpackets = inp->inp_stat->txpackets;
1563 ti->tcpi_txbytes = inp->inp_stat->txbytes;
1564 ti->tcpi_txretransmitbytes = tp->t_stat.txretransmitbytes;
1565 ti->tcpi_txretransmitpackets = tp->t_stat.rxmitpkts;
1566 ti->tcpi_txunacked = tp->snd_max - tp->snd_una;
1567
1568 //atomic_get_64(ti->tcpi_rxbytes, &inp->inp_stat->rxbytes);
1569 ti->tcpi_rxpackets = inp->inp_stat->rxpackets;
1570 ti->tcpi_rxbytes = inp->inp_stat->rxbytes;
1571 ti->tcpi_rxduplicatebytes = tp->t_stat.rxduplicatebytes;
1572 ti->tcpi_rxoutoforderbytes = tp->t_stat.rxoutoforderbytes;
1573
1574 if (tp->t_state > TCPS_LISTEN) {
1575 ti->tcpi_synrexmits = tp->t_stat.synrxtshift;
1576 }
1577 ti->tcpi_cell_rxpackets = inp->inp_cstat->rxpackets;
1578 ti->tcpi_cell_rxbytes = inp->inp_cstat->rxbytes;
1579 ti->tcpi_cell_txpackets = inp->inp_cstat->txpackets;
1580 ti->tcpi_cell_txbytes = inp->inp_cstat->txbytes;
1581
1582 ti->tcpi_wifi_rxpackets = inp->inp_wstat->rxpackets;
1583 ti->tcpi_wifi_rxbytes = inp->inp_wstat->rxbytes;
1584 ti->tcpi_wifi_txpackets = inp->inp_wstat->txpackets;
1585 ti->tcpi_wifi_txbytes = inp->inp_wstat->txbytes;
1586
1587 ti->tcpi_wired_rxpackets = inp->inp_Wstat->rxpackets;
1588 ti->tcpi_wired_rxbytes = inp->inp_Wstat->rxbytes;
1589 ti->tcpi_wired_txpackets = inp->inp_Wstat->txpackets;
1590 ti->tcpi_wired_txbytes = inp->inp_Wstat->txbytes;
1591 tcp_get_connectivity_status(tp, &ti->tcpi_connstatus);
1592
1593 ti->tcpi_tfo_syn_data_rcv = !!(tp->t_tfo_stats & TFO_S_SYNDATA_RCV);
1594 ti->tcpi_tfo_cookie_req_rcv = !!(tp->t_tfo_stats & TFO_S_COOKIEREQ_RECV);
1595 ti->tcpi_tfo_cookie_sent = !!(tp->t_tfo_stats & TFO_S_COOKIE_SENT);
1596 ti->tcpi_tfo_cookie_invalid = !!(tp->t_tfo_stats & TFO_S_COOKIE_INVALID);
1597
1598 ti->tcpi_tfo_cookie_req = !!(tp->t_tfo_stats & TFO_S_COOKIE_REQ);
1599 ti->tcpi_tfo_cookie_rcv = !!(tp->t_tfo_stats & TFO_S_COOKIE_RCV);
1600 ti->tcpi_tfo_syn_data_sent = !!(tp->t_tfo_stats & TFO_S_SYN_DATA_SENT);
1601 ti->tcpi_tfo_syn_data_acked = !!(tp->t_tfo_stats & TFO_S_SYN_DATA_ACKED);
1602 ti->tcpi_tfo_syn_loss = !!(tp->t_tfo_stats & TFO_S_SYN_LOSS);
1603 ti->tcpi_tfo_cookie_wrong = !!(tp->t_tfo_stats & TFO_S_COOKIE_WRONG);
1604 ti->tcpi_tfo_no_cookie_rcv = !!(tp->t_tfo_stats & TFO_S_NO_COOKIE_RCV);
1605 ti->tcpi_tfo_heuristics_disable = !!(tp->t_tfo_stats & TFO_S_HEURISTICS_DISABLE);
1606 ti->tcpi_tfo_send_blackhole = !!(tp->t_tfo_stats & TFO_S_SEND_BLACKHOLE);
1607 ti->tcpi_tfo_recv_blackhole = !!(tp->t_tfo_stats & TFO_S_RECV_BLACKHOLE);
1608 ti->tcpi_tfo_onebyte_proxy = !!(tp->t_tfo_stats & TFO_S_ONE_BYTE_PROXY);
1609
1610 ti->tcpi_ecn_client_setup = !!(tp->ecn_flags & TE_SETUPSENT);
1611 ti->tcpi_ecn_server_setup = !!(tp->ecn_flags & TE_SETUPRECEIVED);
1612 ti->tcpi_ecn_success = (tp->ecn_flags & TE_ECN_ON) == TE_ECN_ON ? 1 : 0;
1613 ti->tcpi_ecn_lost_syn = !!(tp->ecn_flags & TE_LOST_SYN);
1614 ti->tcpi_ecn_lost_synack = !!(tp->ecn_flags & TE_LOST_SYNACK);
1615
1616 ti->tcpi_local_peer = !!(tp->t_flags & TF_LOCAL);
1617
1618 if (tp->t_inpcb->inp_last_outifp != NULL) {
1619 if (IFNET_IS_CELLULAR(tp->t_inpcb->inp_last_outifp))
1620 ti->tcpi_if_cell = 1;
1621 if (IFNET_IS_WIFI(tp->t_inpcb->inp_last_outifp))
1622 ti->tcpi_if_wifi = 1;
1623 if (IFNET_IS_WIRED(tp->t_inpcb->inp_last_outifp))
1624 ti->tcpi_if_wired = 1;
1625 if (IFNET_IS_WIFI_INFRA(tp->t_inpcb->inp_last_outifp))
1626 ti->tcpi_if_wifi_infra = 1;
1627 if (tp->t_inpcb->inp_last_outifp->if_eflags & IFEF_AWDL)
1628 ti->tcpi_if_wifi_awdl = 1;
1629 }
1630 if (tp->tcp_cc_index == TCP_CC_ALGO_BACKGROUND_INDEX)
1631 ti->tcpi_snd_background = 1;
1632 if (tcp_recv_bg == 1 ||
1633 IS_TCP_RECV_BG(tp->t_inpcb->inp_socket))
1634 ti->tcpi_rcv_background = 1;
1635
1636 ti->tcpi_ecn_recv_ce = tp->t_ecn_recv_ce;
1637 ti->tcpi_ecn_recv_cwr = tp->t_ecn_recv_cwr;
1638
1639 ti->tcpi_rcvoopack = tp->t_rcvoopack;
1640 ti->tcpi_pawsdrop = tp->t_pawsdrop;
1641 ti->tcpi_sack_recovery_episode = tp->t_sack_recovery_episode;
1642 ti->tcpi_reordered_pkts = tp->t_reordered_pkts;
1643 ti->tcpi_dsack_sent = tp->t_dsack_sent;
1644 ti->tcpi_dsack_recvd = tp->t_dsack_recvd;
1645 }
1646 }
1647
1648 __private_extern__ errno_t
1649 tcp_fill_info_for_info_tuple(struct info_tuple *itpl, struct tcp_info *ti)
1650 {
1651 struct inpcbinfo *pcbinfo = NULL;
1652 struct inpcb *inp = NULL;
1653 struct socket *so;
1654 struct tcpcb *tp;
1655
1656 if (itpl->itpl_proto == IPPROTO_TCP)
1657 pcbinfo = &tcbinfo;
1658 else
1659 return EINVAL;
1660
1661 if (itpl->itpl_local_sa.sa_family == AF_INET &&
1662 itpl->itpl_remote_sa.sa_family == AF_INET) {
1663 inp = in_pcblookup_hash(pcbinfo,
1664 itpl->itpl_remote_sin.sin_addr,
1665 itpl->itpl_remote_sin.sin_port,
1666 itpl->itpl_local_sin.sin_addr,
1667 itpl->itpl_local_sin.sin_port,
1668 0, NULL);
1669 } else if (itpl->itpl_local_sa.sa_family == AF_INET6 &&
1670 itpl->itpl_remote_sa.sa_family == AF_INET6) {
1671 struct in6_addr ina6_local;
1672 struct in6_addr ina6_remote;
1673
1674 ina6_local = itpl->itpl_local_sin6.sin6_addr;
1675 if (IN6_IS_SCOPE_LINKLOCAL(&ina6_local) &&
1676 itpl->itpl_local_sin6.sin6_scope_id)
1677 ina6_local.s6_addr16[1] = htons(itpl->itpl_local_sin6.sin6_scope_id);
1678
1679 ina6_remote = itpl->itpl_remote_sin6.sin6_addr;
1680 if (IN6_IS_SCOPE_LINKLOCAL(&ina6_remote) &&
1681 itpl->itpl_remote_sin6.sin6_scope_id)
1682 ina6_remote.s6_addr16[1] = htons(itpl->itpl_remote_sin6.sin6_scope_id);
1683
1684 inp = in6_pcblookup_hash(pcbinfo,
1685 &ina6_remote,
1686 itpl->itpl_remote_sin6.sin6_port,
1687 &ina6_local,
1688 itpl->itpl_local_sin6.sin6_port,
1689 0, NULL);
1690 } else {
1691 return EINVAL;
1692 }
1693 if (inp == NULL || (so = inp->inp_socket) == NULL)
1694 return ENOENT;
1695
1696 socket_lock(so, 0);
1697 if (in_pcb_checkstate(inp, WNT_RELEASE, 1) == WNT_STOPUSING) {
1698 socket_unlock(so, 0);
1699 return ENOENT;
1700 }
1701 tp = intotcpcb(inp);
1702
1703 tcp_fill_info(tp, ti);
1704 socket_unlock(so, 0);
1705
1706 return 0;
1707 }
1708
1709 static void
1710 tcp_connection_fill_info(struct tcpcb *tp, struct tcp_connection_info *tci)
1711 {
1712 struct inpcb *inp = tp->t_inpcb;
1713
1714 bzero(tci, sizeof(*tci));
1715 tci->tcpi_state = tp->t_state;
1716 if (tp->t_state > TCPS_LISTEN) {
1717 if (TSTMP_SUPPORTED(tp))
1718 tci->tcpi_options |= TCPCI_OPT_TIMESTAMPS;
1719 if (SACK_ENABLED(tp))
1720 tci->tcpi_options |= TCPCI_OPT_SACK;
1721 if (TCP_WINDOW_SCALE_ENABLED(tp)) {
1722 tci->tcpi_options |= TCPCI_OPT_WSCALE;
1723 tci->tcpi_snd_wscale = tp->snd_scale;
1724 tci->tcpi_rcv_wscale = tp->rcv_scale;
1725 }
1726 if (TCP_ECN_ENABLED(tp))
1727 tci->tcpi_options |= TCPCI_OPT_ECN;
1728 if (IN_FASTRECOVERY(tp) || tp->t_rxtshift > 0)
1729 tci->tcpi_flags |= TCPCI_FLAG_LOSSRECOVERY;
1730 if (tp->t_flagsext & TF_PKTS_REORDERED)
1731 tci->tcpi_flags |= TCPCI_FLAG_REORDERING_DETECTED;
1732 tci->tcpi_rto = (tp->t_timer[TCPT_REXMT] > 0) ?
1733 tp->t_rxtcur : 0;
1734 tci->tcpi_maxseg = tp->t_maxseg;
1735 tci->tcpi_snd_ssthresh = tp->snd_ssthresh;
1736 tci->tcpi_snd_cwnd = tp->snd_cwnd;
1737 tci->tcpi_snd_wnd = tp->snd_wnd;
1738 tci->tcpi_snd_sbbytes = inp->inp_socket->so_snd.sb_cc;
1739 tci->tcpi_rcv_wnd = tp->rcv_wnd;
1740 tci->tcpi_rttcur = tp->t_rttcur;
1741 tci->tcpi_srtt = (tp->t_srtt >> TCP_RTT_SHIFT);
1742 tci->tcpi_rttvar = (tp->t_rttvar >> TCP_RTTVAR_SHIFT);
1743 tci->tcpi_txpackets = inp->inp_stat->txpackets;
1744 tci->tcpi_txbytes = inp->inp_stat->txbytes;
1745 tci->tcpi_txretransmitbytes = tp->t_stat.txretransmitbytes;
1746 tci->tcpi_txretransmitpackets = tp->t_stat.rxmitpkts;
1747 tci->tcpi_rxpackets = inp->inp_stat->rxpackets;
1748 tci->tcpi_rxbytes = inp->inp_stat->rxbytes;
1749 tci->tcpi_rxoutoforderbytes = tp->t_stat.rxoutoforderbytes;
1750
1751 tci->tcpi_tfo_syn_data_rcv = !!(tp->t_tfo_stats & TFO_S_SYNDATA_RCV);
1752 tci->tcpi_tfo_cookie_req_rcv = !!(tp->t_tfo_stats & TFO_S_COOKIEREQ_RECV);
1753 tci->tcpi_tfo_cookie_sent = !!(tp->t_tfo_stats & TFO_S_COOKIE_SENT);
1754 tci->tcpi_tfo_cookie_invalid = !!(tp->t_tfo_stats & TFO_S_COOKIE_INVALID);
1755 tci->tcpi_tfo_cookie_req = !!(tp->t_tfo_stats & TFO_S_COOKIE_REQ);
1756 tci->tcpi_tfo_cookie_rcv = !!(tp->t_tfo_stats & TFO_S_COOKIE_RCV);
1757 tci->tcpi_tfo_syn_data_sent = !!(tp->t_tfo_stats & TFO_S_SYN_DATA_SENT);
1758 tci->tcpi_tfo_syn_data_acked = !!(tp->t_tfo_stats & TFO_S_SYN_DATA_ACKED);
1759 tci->tcpi_tfo_syn_loss = !!(tp->t_tfo_stats & TFO_S_SYN_LOSS);
1760 tci->tcpi_tfo_cookie_wrong = !!(tp->t_tfo_stats & TFO_S_COOKIE_WRONG);
1761 tci->tcpi_tfo_no_cookie_rcv = !!(tp->t_tfo_stats & TFO_S_NO_COOKIE_RCV);
1762 tci->tcpi_tfo_heuristics_disable = !!(tp->t_tfo_stats & TFO_S_HEURISTICS_DISABLE);
1763 tci->tcpi_tfo_send_blackhole = !!(tp->t_tfo_stats & TFO_S_SEND_BLACKHOLE);
1764 tci->tcpi_tfo_recv_blackhole = !!(tp->t_tfo_stats & TFO_S_RECV_BLACKHOLE);
1765 tci->tcpi_tfo_onebyte_proxy = !!(tp->t_tfo_stats & TFO_S_ONE_BYTE_PROXY);
1766 }
1767 }
1768
1769
1770 __private_extern__ int
1771 tcp_sysctl_info(__unused struct sysctl_oid *oidp, __unused void *arg1, __unused int arg2, struct sysctl_req *req)
1772 {
1773 int error;
1774 struct tcp_info ti = {};
1775 struct info_tuple itpl;
1776 #if !CONFIG_EMBEDDED
1777 proc_t caller = PROC_NULL;
1778 proc_t caller_parent = PROC_NULL;
1779 char command_name[MAXCOMLEN + 1] = "";
1780 char parent_name[MAXCOMLEN + 1] = "";
1781
1782 if ((caller = proc_self()) != PROC_NULL) {
1783 /* get process name */
1784 strlcpy(command_name, caller->p_comm, sizeof(command_name));
1785
1786 /* get parent process name if possible */
1787 if ((caller_parent = proc_find(caller->p_ppid)) != PROC_NULL) {
1788 strlcpy(parent_name, caller_parent->p_comm,
1789 sizeof(parent_name));
1790 proc_rele(caller_parent);
1791 }
1792
1793 if ((escape_str(command_name, strlen(command_name) + 1,
1794 sizeof(command_name)) == 0) &&
1795 (escape_str(parent_name, strlen(parent_name) + 1,
1796 sizeof(parent_name)) == 0)) {
1797 kern_asl_msg(LOG_DEBUG, "messagetracer",
1798 5,
1799 "com.apple.message.domain",
1800 "com.apple.kernel.tcpstat", /* 1 */
1801 "com.apple.message.signature",
1802 "tcpinfo", /* 2 */
1803 "com.apple.message.signature2", command_name, /* 3 */
1804 "com.apple.message.signature3", parent_name, /* 4 */
1805 "com.apple.message.summarize", "YES", /* 5 */
1806 NULL);
1807 }
1808 }
1809
1810 if (caller != PROC_NULL)
1811 proc_rele(caller);
1812 #endif /* !CONFIG_EMBEDDED */
1813
1814 if (req->newptr == USER_ADDR_NULL) {
1815 return EINVAL;
1816 }
1817 if (req->newlen < sizeof(struct info_tuple)) {
1818 return EINVAL;
1819 }
1820 error = SYSCTL_IN(req, &itpl, sizeof(struct info_tuple));
1821 if (error != 0) {
1822 return error;
1823 }
1824 error = tcp_fill_info_for_info_tuple(&itpl, &ti);
1825 if (error != 0) {
1826 return error;
1827 }
1828 error = SYSCTL_OUT(req, &ti, sizeof(struct tcp_info));
1829 if (error != 0) {
1830 return error;
1831 }
1832
1833 return 0;
1834 }
1835
1836 static int
1837 tcp_lookup_peer_pid_locked(struct socket *so, pid_t *out_pid)
1838 {
1839 int error = EHOSTUNREACH;
1840 *out_pid = -1;
1841 if ((so->so_state & SS_ISCONNECTED) == 0) return ENOTCONN;
1842
1843 struct inpcb *inp = (struct inpcb*)so->so_pcb;
1844 uint16_t lport = inp->inp_lport;
1845 uint16_t fport = inp->inp_fport;
1846 struct inpcb *finp = NULL;
1847 struct in6_addr laddr6, faddr6;
1848 struct in_addr laddr4, faddr4;
1849
1850 if (inp->inp_vflag & INP_IPV6) {
1851 laddr6 = inp->in6p_laddr;
1852 faddr6 = inp->in6p_faddr;
1853 } else if (inp->inp_vflag & INP_IPV4) {
1854 laddr4 = inp->inp_laddr;
1855 faddr4 = inp->inp_faddr;
1856 }
1857
1858 socket_unlock(so, 0);
1859 if (inp->inp_vflag & INP_IPV6) {
1860 finp = in6_pcblookup_hash(&tcbinfo, &laddr6, lport, &faddr6, fport, 0, NULL);
1861 } else if (inp->inp_vflag & INP_IPV4) {
1862 finp = in_pcblookup_hash(&tcbinfo, laddr4, lport, faddr4, fport, 0, NULL);
1863 }
1864
1865 if (finp) {
1866 *out_pid = finp->inp_socket->last_pid;
1867 error = 0;
1868 in_pcb_checkstate(finp, WNT_RELEASE, 0);
1869 }
1870 socket_lock(so, 0);
1871
1872 return error;
1873 }
1874
1875 void
1876 tcp_getconninfo(struct socket *so, struct conninfo_tcp *tcp_ci)
1877 {
1878 (void) tcp_lookup_peer_pid_locked(so, &tcp_ci->tcpci_peer_pid);
1879 tcp_fill_info(sototcpcb(so), &tcp_ci->tcpci_tcp_info);
1880 }
1881
1882 /*
1883 * The new sockopt interface makes it possible for us to block in the
1884 * copyin/out step (if we take a page fault). Taking a page fault at
1885 * splnet() is probably a Bad Thing. (Since sockets and pcbs both now
1886 * use TSM, there probably isn't any need for this function to run at
1887 * splnet() any more. This needs more examination.)
1888 */
1889 int
1890 tcp_ctloutput(struct socket *so, struct sockopt *sopt)
1891 {
1892 int error = 0, opt = 0, optval = 0;
1893 struct inpcb *inp;
1894 struct tcpcb *tp;
1895
1896 inp = sotoinpcb(so);
1897 if (inp == NULL) {
1898 return (ECONNRESET);
1899 }
1900 /* Allow <SOL_SOCKET,SO_FLUSH/SO_TRAFFIC_MGT_BACKGROUND> at this level */
1901 if (sopt->sopt_level != IPPROTO_TCP &&
1902 !(sopt->sopt_level == SOL_SOCKET && (sopt->sopt_name == SO_FLUSH ||
1903 sopt->sopt_name == SO_TRAFFIC_MGT_BACKGROUND))) {
1904 #if INET6
1905 if (SOCK_CHECK_DOM(so, PF_INET6))
1906 error = ip6_ctloutput(so, sopt);
1907 else
1908 #endif /* INET6 */
1909 error = ip_ctloutput(so, sopt);
1910 return (error);
1911 }
1912 tp = intotcpcb(inp);
1913 if (tp == NULL) {
1914 return (ECONNRESET);
1915 }
1916
1917 calculate_tcp_clock();
1918
1919 switch (sopt->sopt_dir) {
1920 case SOPT_SET:
1921 switch (sopt->sopt_name) {
1922 case TCP_NODELAY:
1923 case TCP_NOOPT:
1924 case TCP_NOPUSH:
1925 error = sooptcopyin(sopt, &optval, sizeof optval,
1926 sizeof optval);
1927 if (error)
1928 break;
1929
1930 switch (sopt->sopt_name) {
1931 case TCP_NODELAY:
1932 opt = TF_NODELAY;
1933 break;
1934 case TCP_NOOPT:
1935 opt = TF_NOOPT;
1936 break;
1937 case TCP_NOPUSH:
1938 opt = TF_NOPUSH;
1939 break;
1940 default:
1941 opt = 0; /* dead code to fool gcc */
1942 break;
1943 }
1944
1945 if (optval)
1946 tp->t_flags |= opt;
1947 else
1948 tp->t_flags &= ~opt;
1949 break;
1950 case TCP_RXT_FINDROP:
1951 case TCP_NOTIMEWAIT:
1952 error = sooptcopyin(sopt, &optval, sizeof optval,
1953 sizeof optval);
1954 if (error)
1955 break;
1956 switch (sopt->sopt_name) {
1957 case TCP_RXT_FINDROP:
1958 opt = TF_RXTFINDROP;
1959 break;
1960 case TCP_NOTIMEWAIT:
1961 opt = TF_NOTIMEWAIT;
1962 break;
1963 default:
1964 opt = 0;
1965 break;
1966 }
1967 if (optval)
1968 tp->t_flagsext |= opt;
1969 else
1970 tp->t_flagsext &= ~opt;
1971 break;
1972 case TCP_MEASURE_SND_BW:
1973 error = sooptcopyin(sopt, &optval, sizeof optval,
1974 sizeof optval);
1975 if (error)
1976 break;
1977 opt = TF_MEASURESNDBW;
1978 if (optval) {
1979 if (tp->t_bwmeas == NULL) {
1980 tp->t_bwmeas = tcp_bwmeas_alloc(tp);
1981 if (tp->t_bwmeas == NULL) {
1982 error = ENOMEM;
1983 break;
1984 }
1985 }
1986 tp->t_flagsext |= opt;
1987 } else {
1988 tp->t_flagsext &= ~opt;
1989 /* Reset snd bw measurement state */
1990 tp->t_flagsext &= ~(TF_BWMEAS_INPROGRESS);
1991 if (tp->t_bwmeas != NULL) {
1992 tcp_bwmeas_free(tp);
1993 }
1994 }
1995 break;
1996 case TCP_MEASURE_BW_BURST: {
1997 struct tcp_measure_bw_burst in;
1998 uint32_t minpkts, maxpkts;
1999 bzero(&in, sizeof(in));
2000
2001 error = sooptcopyin(sopt, &in, sizeof(in),
2002 sizeof(in));
2003 if (error)
2004 break;
2005 if ((tp->t_flagsext & TF_MEASURESNDBW) == 0 ||
2006 tp->t_bwmeas == NULL) {
2007 error = EINVAL;
2008 break;
2009 }
2010 minpkts = (in.min_burst_size != 0) ? in.min_burst_size :
2011 tp->t_bwmeas->bw_minsizepkts;
2012 maxpkts = (in.max_burst_size != 0) ? in.max_burst_size :
2013 tp->t_bwmeas->bw_maxsizepkts;
2014 if (minpkts > maxpkts) {
2015 error = EINVAL;
2016 break;
2017 }
2018 tp->t_bwmeas->bw_minsizepkts = minpkts;
2019 tp->t_bwmeas->bw_maxsizepkts = maxpkts;
2020 tp->t_bwmeas->bw_minsize = (minpkts * tp->t_maxseg);
2021 tp->t_bwmeas->bw_maxsize = (maxpkts * tp->t_maxseg);
2022 break;
2023 }
2024 case TCP_MAXSEG:
2025 error = sooptcopyin(sopt, &optval, sizeof optval,
2026 sizeof optval);
2027 if (error)
2028 break;
2029
2030 if (optval > 0 && optval <= tp->t_maxseg &&
2031 optval + 40 >= tcp_minmss)
2032 tp->t_maxseg = optval;
2033 else
2034 error = EINVAL;
2035 break;
2036
2037 case TCP_KEEPALIVE:
2038 error = sooptcopyin(sopt, &optval, sizeof optval,
2039 sizeof optval);
2040 if (error)
2041 break;
2042 if (optval < 0 || optval > UINT32_MAX/TCP_RETRANSHZ) {
2043 error = EINVAL;
2044 } else {
2045 tp->t_keepidle = optval * TCP_RETRANSHZ;
2046 /* reset the timer to new value */
2047 tp->t_timer[TCPT_KEEP] = OFFSET_FROM_START(tp,
2048 TCP_CONN_KEEPIDLE(tp));
2049 tcp_check_timer_state(tp);
2050 }
2051 break;
2052
2053 case TCP_CONNECTIONTIMEOUT:
2054 error = sooptcopyin(sopt, &optval, sizeof optval,
2055 sizeof optval);
2056 if (error)
2057 break;
2058 if (optval < 0 || optval > UINT32_MAX/TCP_RETRANSHZ) {
2059 error = EINVAL;
2060 } else {
2061 tp->t_keepinit = optval * TCP_RETRANSHZ;
2062 if (tp->t_state == TCPS_SYN_RECEIVED ||
2063 tp->t_state == TCPS_SYN_SENT) {
2064 tp->t_timer[TCPT_KEEP] = OFFSET_FROM_START(tp,
2065 TCP_CONN_KEEPINIT(tp));
2066 tcp_check_timer_state(tp);
2067 }
2068 }
2069 break;
2070
2071 case TCP_KEEPINTVL:
2072 error = sooptcopyin(sopt, &optval, sizeof(optval),
2073 sizeof(optval));
2074 if (error)
2075 break;
2076 if (optval < 0 || optval > UINT32_MAX/TCP_RETRANSHZ) {
2077 error = EINVAL;
2078 } else {
2079 tp->t_keepintvl = optval * TCP_RETRANSHZ;
2080 if (tp->t_state == TCPS_FIN_WAIT_2 &&
2081 TCP_CONN_MAXIDLE(tp) > 0) {
2082 tp->t_timer[TCPT_2MSL] = OFFSET_FROM_START(tp,
2083 TCP_CONN_MAXIDLE(tp));
2084 tcp_check_timer_state(tp);
2085 }
2086 }
2087 break;
2088
2089 case TCP_KEEPCNT:
2090 error = sooptcopyin(sopt, &optval, sizeof(optval),
2091 sizeof(optval));
2092 if (error)
2093 break;
2094 if (optval < 0 || optval > INT32_MAX) {
2095 error = EINVAL;
2096 } else {
2097 tp->t_keepcnt = optval;
2098 if (tp->t_state == TCPS_FIN_WAIT_2 &&
2099 TCP_CONN_MAXIDLE(tp) > 0) {
2100 tp->t_timer[TCPT_2MSL] = OFFSET_FROM_START(tp,
2101 TCP_CONN_MAXIDLE(tp));
2102 tcp_check_timer_state(tp);
2103 }
2104 }
2105 break;
2106
2107 case TCP_KEEPALIVE_OFFLOAD:
2108 error = sooptcopyin(sopt, &optval, sizeof(optval),
2109 sizeof(optval));
2110 if (error)
2111 break;
2112 if (optval < 0 || optval > INT32_MAX) {
2113 error = EINVAL;
2114 break;
2115 }
2116 if (optval != 0)
2117 inp->inp_flags2 |= INP2_KEEPALIVE_OFFLOAD;
2118 else
2119 inp->inp_flags2 &= ~INP2_KEEPALIVE_OFFLOAD;
2120 break;
2121
2122 case PERSIST_TIMEOUT:
2123 error = sooptcopyin(sopt, &optval, sizeof optval,
2124 sizeof optval);
2125 if (error)
2126 break;
2127 if (optval < 0)
2128 error = EINVAL;
2129 else
2130 tp->t_persist_timeout = optval * TCP_RETRANSHZ;
2131 break;
2132 case TCP_RXT_CONNDROPTIME:
2133 error = sooptcopyin(sopt, &optval, sizeof(optval),
2134 sizeof(optval));
2135 if (error)
2136 break;
2137 if (optval < 0)
2138 error = EINVAL;
2139 else
2140 tp->t_rxt_conndroptime = optval * TCP_RETRANSHZ;
2141 break;
2142 case TCP_NOTSENT_LOWAT:
2143 error = sooptcopyin(sopt, &optval, sizeof(optval),
2144 sizeof(optval));
2145 if (error)
2146 break;
2147 if (optval < 0) {
2148 error = EINVAL;
2149 break;
2150 } else {
2151 if (optval == 0) {
2152 so->so_flags &= ~(SOF_NOTSENT_LOWAT);
2153 tp->t_notsent_lowat = 0;
2154 } else {
2155 so->so_flags |= SOF_NOTSENT_LOWAT;
2156 tp->t_notsent_lowat = optval;
2157 }
2158 }
2159 break;
2160 case TCP_ADAPTIVE_READ_TIMEOUT:
2161 error = sooptcopyin(sopt, &optval, sizeof (optval),
2162 sizeof(optval));
2163 if (error)
2164 break;
2165 if (optval < 0 ||
2166 optval > TCP_ADAPTIVE_TIMEOUT_MAX) {
2167 error = EINVAL;
2168 break;
2169 } else if (optval == 0) {
2170 tp->t_adaptive_rtimo = 0;
2171 tcp_keepalive_reset(tp);
2172
2173 if (tp->t_mpsub)
2174 mptcp_reset_keepalive(tp);
2175 } else {
2176 tp->t_adaptive_rtimo = optval;
2177 }
2178 break;
2179 case TCP_ADAPTIVE_WRITE_TIMEOUT:
2180 error = sooptcopyin(sopt, &optval, sizeof (optval),
2181 sizeof (optval));
2182 if (error)
2183 break;
2184 if (optval < 0 ||
2185 optval > TCP_ADAPTIVE_TIMEOUT_MAX) {
2186 error = EINVAL;
2187 break;
2188 } else {
2189 tp->t_adaptive_wtimo = optval;
2190 }
2191 break;
2192 case TCP_ENABLE_MSGS:
2193 error = sooptcopyin(sopt, &optval, sizeof(optval),
2194 sizeof(optval));
2195 if (error)
2196 break;
2197 if (optval < 0 || optval > 1) {
2198 error = EINVAL;
2199 } else if (optval == 1) {
2200 /*
2201 * Check if messages option is already
2202 * enabled, if so return.
2203 */
2204 if (so->so_flags & SOF_ENABLE_MSGS) {
2205 VERIFY(so->so_msg_state != NULL);
2206 break;
2207 }
2208
2209 /*
2210 * allocate memory for storing message
2211 * related state
2212 */
2213 VERIFY(so->so_msg_state == NULL);
2214 MALLOC(so->so_msg_state,
2215 struct msg_state *,
2216 sizeof(struct msg_state),
2217 M_TEMP, M_WAITOK | M_ZERO);
2218 if (so->so_msg_state == NULL) {
2219 error = ENOMEM;
2220 break;
2221 }
2222
2223 /* Enable message delivery */
2224 so->so_flags |= SOF_ENABLE_MSGS;
2225 } else {
2226 /*
2227 * Can't disable message delivery on socket
2228 * because of restrictions imposed by
2229 * encoding/decoding
2230 */
2231 error = EINVAL;
2232 }
2233 break;
2234 case TCP_SENDMOREACKS:
2235 error = sooptcopyin(sopt, &optval, sizeof(optval),
2236 sizeof(optval));
2237 if (error)
2238 break;
2239 if (optval < 0 || optval > 1) {
2240 error = EINVAL;
2241 } else if (optval == 0) {
2242 tp->t_flagsext &= ~(TF_NOSTRETCHACK);
2243 } else {
2244 tp->t_flagsext |= TF_NOSTRETCHACK;
2245 }
2246 break;
2247 case TCP_DISABLE_BLACKHOLE_DETECTION:
2248 error = sooptcopyin(sopt, &optval, sizeof(optval),
2249 sizeof(optval));
2250 if (error)
2251 break;
2252 if (optval < 0 || optval > 1) {
2253 error = EINVAL;
2254 } else if (optval == 0) {
2255 tp->t_flagsext &= ~TF_NOBLACKHOLE_DETECTION;
2256 } else {
2257 tp->t_flagsext |= TF_NOBLACKHOLE_DETECTION;
2258 if ((tp->t_flags & TF_BLACKHOLE) &&
2259 tp->t_pmtud_saved_maxopd > 0)
2260 tcp_pmtud_revert_segment_size(tp);
2261 }
2262 break;
2263 case TCP_FASTOPEN:
2264 if (!(tcp_fastopen & TCP_FASTOPEN_SERVER)) {
2265 error = ENOTSUP;
2266 break;
2267 }
2268
2269 error = sooptcopyin(sopt, &optval, sizeof(optval),
2270 sizeof(optval));
2271 if (error)
2272 break;
2273 if (optval < 0 || optval > 1) {
2274 error = EINVAL;
2275 break;
2276 }
2277 if (tp->t_state != TCPS_LISTEN) {
2278 error = EINVAL;
2279 break;
2280 }
2281 if (optval)
2282 tp->t_flagsext |= TF_FASTOPEN;
2283 else
2284 tcp_disable_tfo(tp);
2285 break;
2286 case TCP_FASTOPEN_FORCE_HEURISTICS:
2287 error = sooptcopyin(sopt, &optval, sizeof(optval),
2288 sizeof(optval));
2289
2290 if (error)
2291 break;
2292 if (optval < 0 || optval > 1) {
2293 error = EINVAL;
2294 break;
2295 }
2296
2297 if (tp->t_state != TCPS_CLOSED) {
2298 error = EINVAL;
2299 break;
2300 }
2301 if (optval)
2302 tp->t_flagsext |= TF_FASTOPEN_HEUR;
2303 else
2304 tp->t_flagsext &= ~TF_FASTOPEN_HEUR;
2305
2306 break;
2307 case TCP_ENABLE_ECN:
2308 error = sooptcopyin(sopt, &optval, sizeof optval,
2309 sizeof optval);
2310 if (error)
2311 break;
2312 if (optval) {
2313 tp->ecn_flags |= TE_ECN_MODE_ENABLE;
2314 tp->ecn_flags &= ~TE_ECN_MODE_DISABLE;
2315 } else {
2316 tp->ecn_flags &= ~TE_ECN_MODE_ENABLE;
2317 tp->ecn_flags |= TE_ECN_MODE_DISABLE;
2318 }
2319 break;
2320 case TCP_ECN_MODE:
2321 error = sooptcopyin(sopt, &optval, sizeof optval,
2322 sizeof optval);
2323 if (error)
2324 break;
2325 if (optval == ECN_MODE_DEFAULT) {
2326 tp->ecn_flags &= ~TE_ECN_MODE_ENABLE;
2327 tp->ecn_flags &= ~TE_ECN_MODE_DISABLE;
2328 } else if (optval == ECN_MODE_ENABLE) {
2329 tp->ecn_flags |= TE_ECN_MODE_ENABLE;
2330 tp->ecn_flags &= ~TE_ECN_MODE_DISABLE;
2331 } else if (optval == ECN_MODE_DISABLE) {
2332 tp->ecn_flags &= ~TE_ECN_MODE_ENABLE;
2333 tp->ecn_flags |= TE_ECN_MODE_DISABLE;
2334 } else {
2335 error = EINVAL;
2336 }
2337 break;
2338 case TCP_NOTIFY_ACKNOWLEDGEMENT:
2339 error = sooptcopyin(sopt, &optval,
2340 sizeof(optval), sizeof(optval));
2341 if (error)
2342 break;
2343 if (optval <= 0) {
2344 error = EINVAL;
2345 break;
2346 }
2347 if (tp->t_notify_ack_count >= TCP_MAX_NOTIFY_ACK) {
2348 error = ETOOMANYREFS;
2349 break;
2350 }
2351
2352 /*
2353 * validate that the given marker id is not
2354 * a duplicate to avoid ambiguity
2355 */
2356 if ((error = tcp_notify_ack_id_valid(tp, so,
2357 optval)) != 0) {
2358 break;
2359 }
2360 error = tcp_add_notify_ack_marker(tp, optval);
2361 break;
2362 case SO_FLUSH:
2363 if ((error = sooptcopyin(sopt, &optval, sizeof (optval),
2364 sizeof (optval))) != 0)
2365 break;
2366
2367 error = inp_flush(inp, optval);
2368 break;
2369
2370 case SO_TRAFFIC_MGT_BACKGROUND:
2371 if ((error = sooptcopyin(sopt, &optval, sizeof (optval),
2372 sizeof (optval))) != 0)
2373 break;
2374
2375 if (optval) {
2376 socket_set_traffic_mgt_flags_locked(so,
2377 TRAFFIC_MGT_SO_BACKGROUND);
2378 } else {
2379 socket_clear_traffic_mgt_flags_locked(so,
2380 TRAFFIC_MGT_SO_BACKGROUND);
2381 }
2382 break;
2383 case TCP_RXT_MINIMUM_TIMEOUT:
2384 error = sooptcopyin(sopt, &optval, sizeof(optval),
2385 sizeof(optval));
2386 if (error)
2387 break;
2388 if (optval < 0) {
2389 error = EINVAL;
2390 break;
2391 }
2392 if (optval == 0) {
2393 tp->t_rxt_minimum_timeout = 0;
2394 } else {
2395 tp->t_rxt_minimum_timeout = min(optval,
2396 TCP_RXT_MINIMUM_TIMEOUT_LIMIT);
2397 /* convert to milliseconds */
2398 tp->t_rxt_minimum_timeout *= TCP_RETRANSHZ;
2399 }
2400 break;
2401 default:
2402 error = ENOPROTOOPT;
2403 break;
2404 }
2405 break;
2406
2407 case SOPT_GET:
2408 switch (sopt->sopt_name) {
2409 case TCP_NODELAY:
2410 optval = tp->t_flags & TF_NODELAY;
2411 break;
2412 case TCP_MAXSEG:
2413 optval = tp->t_maxseg;
2414 break;
2415 case TCP_KEEPALIVE:
2416 if (tp->t_keepidle > 0)
2417 optval = tp->t_keepidle / TCP_RETRANSHZ;
2418 else
2419 optval = tcp_keepidle / TCP_RETRANSHZ;
2420 break;
2421 case TCP_KEEPINTVL:
2422 if (tp->t_keepintvl > 0)
2423 optval = tp->t_keepintvl / TCP_RETRANSHZ;
2424 else
2425 optval = tcp_keepintvl / TCP_RETRANSHZ;
2426 break;
2427 case TCP_KEEPCNT:
2428 if (tp->t_keepcnt > 0)
2429 optval = tp->t_keepcnt;
2430 else
2431 optval = tcp_keepcnt;
2432 break;
2433 case TCP_KEEPALIVE_OFFLOAD:
2434 optval = !!(inp->inp_flags2 & INP2_KEEPALIVE_OFFLOAD);
2435 break;
2436 case TCP_NOOPT:
2437 optval = tp->t_flags & TF_NOOPT;
2438 break;
2439 case TCP_NOPUSH:
2440 optval = tp->t_flags & TF_NOPUSH;
2441 break;
2442 case TCP_ENABLE_ECN:
2443 optval = (tp->ecn_flags & TE_ECN_MODE_ENABLE) ? 1 : 0;
2444 break;
2445 case TCP_ECN_MODE:
2446 if (tp->ecn_flags & TE_ECN_MODE_ENABLE)
2447 optval = ECN_MODE_ENABLE;
2448 else if (tp->ecn_flags & TE_ECN_MODE_DISABLE)
2449 optval = ECN_MODE_DISABLE;
2450 else
2451 optval = ECN_MODE_DEFAULT;
2452 break;
2453 case TCP_CONNECTIONTIMEOUT:
2454 optval = tp->t_keepinit / TCP_RETRANSHZ;
2455 break;
2456 case PERSIST_TIMEOUT:
2457 optval = tp->t_persist_timeout / TCP_RETRANSHZ;
2458 break;
2459 case TCP_RXT_CONNDROPTIME:
2460 optval = tp->t_rxt_conndroptime / TCP_RETRANSHZ;
2461 break;
2462 case TCP_RXT_FINDROP:
2463 optval = tp->t_flagsext & TF_RXTFINDROP;
2464 break;
2465 case TCP_NOTIMEWAIT:
2466 optval = (tp->t_flagsext & TF_NOTIMEWAIT) ? 1 : 0;
2467 break;
2468 case TCP_FASTOPEN:
2469 if (tp->t_state != TCPS_LISTEN ||
2470 !(tcp_fastopen & TCP_FASTOPEN_SERVER)) {
2471 error = ENOTSUP;
2472 break;
2473 }
2474 optval = tfo_enabled(tp);
2475 break;
2476 case TCP_FASTOPEN_FORCE_HEURISTICS:
2477 optval = (tp->t_flagsext & TF_FASTOPEN_HEUR) ? 1 : 0;
2478 break;
2479 case TCP_MEASURE_SND_BW:
2480 optval = tp->t_flagsext & TF_MEASURESNDBW;
2481 break;
2482 case TCP_INFO: {
2483 struct tcp_info ti;
2484
2485 tcp_fill_info(tp, &ti);
2486 error = sooptcopyout(sopt, &ti, sizeof(struct tcp_info));
2487 goto done;
2488 /* NOT REACHED */
2489 }
2490 case TCP_CONNECTION_INFO: {
2491 struct tcp_connection_info tci;
2492 tcp_connection_fill_info(tp, &tci);
2493 error = sooptcopyout(sopt, &tci,
2494 sizeof(struct tcp_connection_info));
2495 goto done;
2496 }
2497 case TCP_MEASURE_BW_BURST: {
2498 struct tcp_measure_bw_burst out = {};
2499 if ((tp->t_flagsext & TF_MEASURESNDBW) == 0 ||
2500 tp->t_bwmeas == NULL) {
2501 error = EINVAL;
2502 break;
2503 }
2504 out.min_burst_size = tp->t_bwmeas->bw_minsizepkts;
2505 out.max_burst_size = tp->t_bwmeas->bw_maxsizepkts;
2506 error = sooptcopyout(sopt, &out, sizeof(out));
2507 goto done;
2508 }
2509 case TCP_NOTSENT_LOWAT:
2510 if ((so->so_flags & SOF_NOTSENT_LOWAT) != 0) {
2511 optval = tp->t_notsent_lowat;
2512 } else {
2513 optval = 0;
2514 }
2515 break;
2516
2517 case TCP_ENABLE_MSGS:
2518 if (so->so_flags & SOF_ENABLE_MSGS) {
2519 optval = 1;
2520 } else {
2521 optval = 0;
2522 }
2523 break;
2524 case TCP_SENDMOREACKS:
2525 if (tp->t_flagsext & TF_NOSTRETCHACK)
2526 optval = 1;
2527 else
2528 optval = 0;
2529 break;
2530 case TCP_DISABLE_BLACKHOLE_DETECTION:
2531 if (tp->t_flagsext & TF_NOBLACKHOLE_DETECTION)
2532 optval = 1;
2533 else
2534 optval = 0;
2535 break;
2536 case TCP_PEER_PID: {
2537 pid_t pid;
2538 error = tcp_lookup_peer_pid_locked(so, &pid);
2539 if (error == 0)
2540 error = sooptcopyout(sopt, &pid, sizeof(pid));
2541 goto done;
2542 }
2543 case TCP_ADAPTIVE_READ_TIMEOUT:
2544 optval = tp->t_adaptive_rtimo;
2545 break;
2546 case TCP_ADAPTIVE_WRITE_TIMEOUT:
2547 optval = tp->t_adaptive_wtimo;
2548 break;
2549 case SO_TRAFFIC_MGT_BACKGROUND:
2550 optval = (so->so_flags1 &
2551 SOF1_TRAFFIC_MGT_SO_BACKGROUND) ? 1 : 0;
2552 break;
2553 case TCP_NOTIFY_ACKNOWLEDGEMENT: {
2554 struct tcp_notify_ack_complete retid;
2555
2556 if (sopt->sopt_valsize != sizeof (retid)) {
2557 error = EINVAL;
2558 break;
2559 }
2560 bzero(&retid, sizeof (retid));
2561 tcp_get_notify_ack_count(tp, &retid);
2562 if (retid.notify_complete_count > 0)
2563 tcp_get_notify_ack_ids(tp, &retid);
2564
2565 error = sooptcopyout(sopt, &retid, sizeof (retid));
2566 goto done;
2567 }
2568 case TCP_RXT_MINIMUM_TIMEOUT:
2569 optval = tp->t_rxt_minimum_timeout / TCP_RETRANSHZ;
2570 break;
2571 default:
2572 error = ENOPROTOOPT;
2573 break;
2574 }
2575 if (error == 0)
2576 error = sooptcopyout(sopt, &optval, sizeof optval);
2577 break;
2578 }
2579 done:
2580 return (error);
2581 }
2582
2583 /*
2584 * tcp_sendspace and tcp_recvspace are the default send and receive window
2585 * sizes, respectively. These are obsolescent (this information should
2586 * be set by the route).
2587 */
2588 u_int32_t tcp_sendspace = 1448*256;
2589 u_int32_t tcp_recvspace = 1448*384;
2590
2591 /* During attach, the size of socket buffer allocated is limited to
2592 * sb_max in sbreserve. Disallow setting the tcp send and recv space
2593 * to be more than sb_max because that will cause tcp_attach to fail
2594 * (see radar 5713060)
2595 */
2596 static int
2597 sysctl_tcp_sospace(struct sysctl_oid *oidp, __unused void *arg1,
2598 int arg2, struct sysctl_req *req)
2599 {
2600 #pragma unused(arg2)
2601 u_int32_t new_value = 0, *space_p = NULL;
2602 int changed = 0, error = 0;
2603 u_quad_t sb_effective_max = (sb_max / (MSIZE+MCLBYTES)) * MCLBYTES;
2604
2605 switch (oidp->oid_number) {
2606 case TCPCTL_SENDSPACE:
2607 space_p = &tcp_sendspace;
2608 break;
2609 case TCPCTL_RECVSPACE:
2610 space_p = &tcp_recvspace;
2611 break;
2612 default:
2613 return EINVAL;
2614 }
2615 error = sysctl_io_number(req, *space_p, sizeof(u_int32_t),
2616 &new_value, &changed);
2617 if (changed) {
2618 if (new_value > 0 && new_value <= sb_effective_max) {
2619 *space_p = new_value;
2620 SYSCTL_SKMEM_UPDATE_AT_OFFSET(arg2, new_value);
2621 } else {
2622 error = ERANGE;
2623 }
2624 }
2625 return error;
2626 }
2627
2628 #if SYSCTL_SKMEM
2629 SYSCTL_PROC(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace,
2630 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, &tcp_sendspace,
2631 offsetof(skmem_sysctl, tcp.sendspace), sysctl_tcp_sospace,
2632 "IU", "Maximum outgoing TCP datagram size");
2633 SYSCTL_PROC(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace,
2634 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, &tcp_recvspace,
2635 offsetof(skmem_sysctl, tcp.recvspace), sysctl_tcp_sospace,
2636 "IU", "Maximum incoming TCP datagram size");
2637 #else /* SYSCTL_SKMEM */
2638 SYSCTL_PROC(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED,
2639 &tcp_sendspace , 0, &sysctl_tcp_sospace, "IU", "Maximum outgoing TCP datagram size");
2640 SYSCTL_PROC(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED,
2641 &tcp_recvspace , 0, &sysctl_tcp_sospace, "IU", "Maximum incoming TCP datagram size");
2642 #endif /* SYSCTL_SKMEM */
2643
2644 /*
2645 * Attach TCP protocol to socket, allocating
2646 * internet protocol control block, tcp control block,
2647 * bufer space, and entering LISTEN state if to accept connections.
2648 *
2649 * Returns: 0 Success
2650 * in_pcballoc:ENOBUFS
2651 * in_pcballoc:ENOMEM
2652 * in_pcballoc:??? [IPSEC specific]
2653 * soreserve:ENOBUFS
2654 */
2655 static int
2656 tcp_attach(struct socket *so, struct proc *p)
2657 {
2658 struct tcpcb *tp;
2659 struct inpcb *inp;
2660 int error;
2661 #if INET6
2662 int isipv6 = SOCK_CHECK_DOM(so, PF_INET6) != 0;
2663 #endif
2664
2665 error = in_pcballoc(so, &tcbinfo, p);
2666 if (error)
2667 return (error);
2668
2669 inp = sotoinpcb(so);
2670
2671 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
2672 error = soreserve(so, tcp_sendspace, tcp_recvspace);
2673 if (error)
2674 return (error);
2675 }
2676
2677 if (so->so_snd.sb_preconn_hiwat == 0) {
2678 soreserve_preconnect(so, 2048);
2679 }
2680
2681 if ((so->so_rcv.sb_flags & SB_USRSIZE) == 0)
2682 so->so_rcv.sb_flags |= SB_AUTOSIZE;
2683 if ((so->so_snd.sb_flags & SB_USRSIZE) == 0)
2684 so->so_snd.sb_flags |= SB_AUTOSIZE;
2685
2686 #if INET6
2687 if (isipv6) {
2688 inp->inp_vflag |= INP_IPV6;
2689 inp->in6p_hops = -1; /* use kernel default */
2690 }
2691 else
2692 #endif /* INET6 */
2693 inp->inp_vflag |= INP_IPV4;
2694 tp = tcp_newtcpcb(inp);
2695 if (tp == NULL) {
2696 int nofd = so->so_state & SS_NOFDREF; /* XXX */
2697
2698 so->so_state &= ~SS_NOFDREF; /* don't free the socket yet */
2699 #if INET6
2700 if (isipv6)
2701 in6_pcbdetach(inp);
2702 else
2703 #endif /* INET6 */
2704 in_pcbdetach(inp);
2705 so->so_state |= nofd;
2706 return (ENOBUFS);
2707 }
2708 if (nstat_collect)
2709 nstat_tcp_new_pcb(inp);
2710 tp->t_state = TCPS_CLOSED;
2711 return (0);
2712 }
2713
2714 /*
2715 * Initiate (or continue) disconnect.
2716 * If embryonic state, just send reset (once).
2717 * If in ``let data drain'' option and linger null, just drop.
2718 * Otherwise (hard), mark socket disconnecting and drop
2719 * current input data; switch states based on user close, and
2720 * send segment to peer (with FIN).
2721 */
2722 static struct tcpcb *
2723 tcp_disconnect(struct tcpcb *tp)
2724 {
2725 struct socket *so = tp->t_inpcb->inp_socket;
2726
2727 if (so->so_rcv.sb_cc != 0 || tp->t_reassqlen != 0)
2728 return tcp_drop(tp, 0);
2729
2730 if (tp->t_state < TCPS_ESTABLISHED)
2731 tp = tcp_close(tp);
2732 else if ((so->so_options & SO_LINGER) && so->so_linger == 0)
2733 tp = tcp_drop(tp, 0);
2734 else {
2735 soisdisconnecting(so);
2736 sbflush(&so->so_rcv);
2737 tp = tcp_usrclosed(tp);
2738 #if MPTCP
2739 /* A reset has been sent but socket exists, do not send FIN */
2740 if ((so->so_flags & SOF_MP_SUBFLOW) &&
2741 (tp) && (tp->t_mpflags & TMPF_RESET))
2742 return (tp);
2743 #endif
2744 if (tp)
2745 (void) tcp_output(tp);
2746 }
2747 return (tp);
2748 }
2749
2750 /*
2751 * User issued close, and wish to trail through shutdown states:
2752 * if never received SYN, just forget it. If got a SYN from peer,
2753 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
2754 * If already got a FIN from peer, then almost done; go to LAST_ACK
2755 * state. In all other cases, have already sent FIN to peer (e.g.
2756 * after PRU_SHUTDOWN), and just have to play tedious game waiting
2757 * for peer to send FIN or not respond to keep-alives, etc.
2758 * We can let the user exit from the close as soon as the FIN is acked.
2759 */
2760 static struct tcpcb *
2761 tcp_usrclosed(struct tcpcb *tp)
2762 {
2763 switch (tp->t_state) {
2764
2765 case TCPS_CLOSED:
2766 case TCPS_LISTEN:
2767 case TCPS_SYN_SENT:
2768 tp = tcp_close(tp);
2769 break;
2770
2771 case TCPS_SYN_RECEIVED:
2772 tp->t_flags |= TF_NEEDFIN;
2773 break;
2774
2775 case TCPS_ESTABLISHED:
2776 DTRACE_TCP4(state__change, void, NULL,
2777 struct inpcb *, tp->t_inpcb,
2778 struct tcpcb *, tp,
2779 int32_t, TCPS_FIN_WAIT_1);
2780 tp->t_state = TCPS_FIN_WAIT_1;
2781 break;
2782
2783 case TCPS_CLOSE_WAIT:
2784 DTRACE_TCP4(state__change, void, NULL,
2785 struct inpcb *, tp->t_inpcb,
2786 struct tcpcb *, tp,
2787 int32_t, TCPS_LAST_ACK);
2788 tp->t_state = TCPS_LAST_ACK;
2789 break;
2790 }
2791 if (tp && tp->t_state >= TCPS_FIN_WAIT_2) {
2792 soisdisconnected(tp->t_inpcb->inp_socket);
2793 /* To prevent the connection hanging in FIN_WAIT_2 forever. */
2794 if (tp->t_state == TCPS_FIN_WAIT_2)
2795 tp->t_timer[TCPT_2MSL] = OFFSET_FROM_START(tp,
2796 TCP_CONN_MAXIDLE(tp));
2797 }
2798 return (tp);
2799 }
2800
2801 void
2802 tcp_in_cksum_stats(u_int32_t len)
2803 {
2804 tcpstat.tcps_rcv_swcsum++;
2805 tcpstat.tcps_rcv_swcsum_bytes += len;
2806 }
2807
2808 void
2809 tcp_out_cksum_stats(u_int32_t len)
2810 {
2811 tcpstat.tcps_snd_swcsum++;
2812 tcpstat.tcps_snd_swcsum_bytes += len;
2813 }
2814
2815 #if INET6
2816 void
2817 tcp_in6_cksum_stats(u_int32_t len)
2818 {
2819 tcpstat.tcps_rcv6_swcsum++;
2820 tcpstat.tcps_rcv6_swcsum_bytes += len;
2821 }
2822
2823 void
2824 tcp_out6_cksum_stats(u_int32_t len)
2825 {
2826 tcpstat.tcps_snd6_swcsum++;
2827 tcpstat.tcps_snd6_swcsum_bytes += len;
2828 }
2829
2830 /*
2831 * When messages are enabled on a TCP socket, the message priority
2832 * is sent as a control message. This function will extract it.
2833 */
2834 int
2835 tcp_get_msg_priority(struct mbuf *control, uint32_t *msgpri)
2836 {
2837 struct cmsghdr *cm;
2838 if (control == NULL)
2839 return(EINVAL);
2840
2841 for (cm = M_FIRST_CMSGHDR(control); cm;
2842 cm = M_NXT_CMSGHDR(control, cm)) {
2843 if (cm->cmsg_len < sizeof(struct cmsghdr) ||
2844 cm->cmsg_len > control->m_len) {
2845 return (EINVAL);
2846 }
2847 if (cm->cmsg_level == SOL_SOCKET &&
2848 cm->cmsg_type == SCM_MSG_PRIORITY) {
2849 *msgpri = *(unsigned int *)(void *)CMSG_DATA(cm);
2850 break;
2851 }
2852 }
2853
2854 VERIFY(*msgpri >= MSG_PRI_MIN && *msgpri <= MSG_PRI_MAX);
2855 return (0);
2856 }
2857 #endif /* INET6 */
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