1 /*
2 * Copyright (c) 2000-2022 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 #include <sys/domain.h>
71 #include <sys/priv.h>
72 #include <sys/socket.h>
73 #include <sys/socketvar.h>
74 #include <sys/protosw.h>
75 #include <sys/syslog.h>
76
77 #include <net/if.h>
78 #include <net/route.h>
79 #include <net/ntstat.h>
80 #include <net/content_filter.h>
81 #include <net/multi_layer_pkt_log.h>
82
83 #include <netinet/in.h>
84 #include <netinet/in_systm.h>
85 #include <netinet/ip6.h>
86 #include <netinet/in_pcb.h>
87 #include <netinet6/in6_pcb.h>
88 #include <netinet/in_var.h>
89 #include <netinet/ip_var.h>
90 #include <netinet6/ip6_var.h>
91 #include <netinet/tcp.h>
92 #include <netinet/tcp_fsm.h>
93 #include <netinet/tcp_seq.h>
94 #include <netinet/tcp_timer.h>
95 #include <netinet/tcp_var.h>
96 #include <netinet/tcpip.h>
97 #include <netinet/tcp_cc.h>
98 #include <netinet/tcp_log.h>
99 #include <mach/sdt.h>
100 #if TCPDEBUG
101 #include <netinet/tcp_debug.h>
102 #endif
103 #if MPTCP
104 #include <netinet/mptcp_var.h>
105 #endif /* MPTCP */
106
107 #if IPSEC
108 #include <netinet6/ipsec.h>
109 #endif /*IPSEC*/
110
111 #if FLOW_DIVERT
112 #include <netinet/flow_divert.h>
113 #endif /* FLOW_DIVERT */
114
115 #if SKYWALK
116 #include <libkern/sysctl.h>
117 #include <skywalk/os_stats_private.h>
118 #endif /* SKYWALK */
119
120 extern char *proc_name_address(void *p);
121
122 errno_t tcp_fill_info_for_info_tuple(struct info_tuple *, struct tcp_info *);
123
124 static int tcp_sysctl_info(struct sysctl_oid *, void *, int, struct sysctl_req *);
125 static void tcp_connection_fill_info(struct tcpcb *tp,
126 struct tcp_connection_info *tci);
127 static int tcp_get_mpkl_send_info(struct mbuf *, struct so_mpkl_send_info *);
128
129 /*
130 * TCP protocol interface to socket abstraction.
131 */
132 static int tcp_attach(struct socket *, struct proc *);
133 static int tcp_connect(struct tcpcb *, struct sockaddr *, struct proc *);
134 static int tcp6_connect(struct tcpcb *, struct sockaddr *, struct proc *);
135 static int tcp6_usr_connect(struct socket *, struct sockaddr *,
136 struct proc *);
137 static struct tcpcb *tcp_disconnect(struct tcpcb *);
138 static struct tcpcb *tcp_usrclosed(struct tcpcb *);
139 extern void tcp_sbrcv_trim(struct tcpcb *tp, struct sockbuf *sb);
140
141 #if TCPDEBUG
142 #define TCPDEBUG0 int ostate = 0
143 #define TCPDEBUG1() ostate = tp ? tp->t_state : 0
144 #define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \
145 tcp_trace(TA_USER, ostate, tp, 0, 0, req)
146 #else
147 #define TCPDEBUG0
148 #define TCPDEBUG1()
149 #define TCPDEBUG2(req)
150 #endif
151
152 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, info,
153 CTLFLAG_RW | CTLFLAG_LOCKED | CTLFLAG_ANYBODY | CTLFLAG_KERN,
154 0, 0, tcp_sysctl_info, "S", "TCP info per tuple");
155
156 int faster_mcopy = 0;
157 SYSCTL_INT(_net_inet_tcp, OID_AUTO, faster_mcopy,
158 CTLFLAG_RW | CTLFLAG_LOCKED, &faster_mcopy, 0,
159 "Speed up m_copym");
160
161 /*
162 * TCP attaches to socket via pru_attach(), reserving space,
163 * and an internet control block.
164 *
165 * Returns: 0 Success
166 * EISCONN
167 * tcp_attach:ENOBUFS
168 * tcp_attach:ENOMEM
169 * tcp_attach:??? [IPSEC specific]
170 */
171 static int
tcp_usr_attach(struct socket * so,__unused int proto,struct proc * p)172 tcp_usr_attach(struct socket *so, __unused int proto, struct proc *p)
173 {
174 int error;
175 struct inpcb *inp = sotoinpcb(so);
176 struct tcpcb *tp = 0;
177 TCPDEBUG0;
178
179 TCPDEBUG1();
180 if (inp) {
181 error = EISCONN;
182 goto out;
183 }
184
185 error = tcp_attach(so, p);
186 if (error) {
187 goto out;
188 }
189
190 if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
191 so->so_linger = (short)(TCP_LINGERTIME * hz);
192 }
193 if (faster_mcopy) {
194 so->so_snd.sb_flags |= SB_SENDHEAD;
195 so->so_snd.sb_sendhead = NULL;
196 so->so_snd.sb_sendoff = 0;
197 }
198
199 tp = sototcpcb(so);
200 out:
201 TCPDEBUG2(PRU_ATTACH);
202 return error;
203 }
204
205 /*
206 * pru_detach() detaches the TCP protocol from the socket.
207 * If the protocol state is non-embryonic, then can't
208 * do this directly: have to initiate a pru_disconnect(),
209 * which may finish later; embryonic TCB's can just
210 * be discarded here.
211 */
212 static int
tcp_usr_detach(struct socket * so)213 tcp_usr_detach(struct socket *so)
214 {
215 int error = 0;
216 struct inpcb *inp = sotoinpcb(so);
217 struct tcpcb *tp;
218 TCPDEBUG0;
219
220 if (inp == 0 || (inp->inp_state == INPCB_STATE_DEAD)) {
221 return EINVAL; /* XXX */
222 }
223 socket_lock_assert_owned(so);
224 tp = intotcpcb(inp);
225 /* In case we got disconnected from the peer */
226 if (tp == NULL) {
227 goto out;
228 }
229 TCPDEBUG1();
230
231 calculate_tcp_clock();
232
233 tp = tcp_disconnect(tp);
234 out:
235 TCPDEBUG2(PRU_DETACH);
236 return error;
237 }
238
239 #if NECP
240 #define COMMON_START_ALLOW_FLOW_DIVERT(allow) TCPDEBUG0; \
241 do { \
242 if (inp == NULL || inp->inp_state == INPCB_STATE_DEAD) \
243 return (EINVAL); \
244 if (!(allow) && necp_socket_should_use_flow_divert(inp)) \
245 return (EPROTOTYPE); \
246 tp = intotcpcb(inp); \
247 TCPDEBUG1(); \
248 calculate_tcp_clock(); \
249 } while (0)
250 #else /* NECP */
251 #define COMMON_START_ALLOW_FLOW_DIVERT(allow) TCPDEBUG0; \
252 do { \
253 if (inp == NULL || inp->inp_state == INPCB_STATE_DEAD) \
254 return (EINVAL); \
255 tp = intotcpcb(inp); \
256 TCPDEBUG1(); \
257 calculate_tcp_clock(); \
258 } while (0)
259 #endif /* !NECP */
260
261 #define COMMON_START() COMMON_START_ALLOW_FLOW_DIVERT(false)
262 #define COMMON_END(req) out: TCPDEBUG2(req); return error; goto out
263
264
265 /*
266 * Give the socket an address.
267 *
268 * Returns: 0 Success
269 * EINVAL Invalid argument [COMMON_START]
270 * EAFNOSUPPORT Address family not supported
271 * in_pcbbind:EADDRNOTAVAIL Address not available.
272 * in_pcbbind:EINVAL Invalid argument
273 * in_pcbbind:EAFNOSUPPORT Address family not supported [notdef]
274 * in_pcbbind:EACCES Permission denied
275 * in_pcbbind:EADDRINUSE Address in use
276 * in_pcbbind:EAGAIN Resource unavailable, try again
277 * in_pcbbind:EPERM Operation not permitted
278 */
279 static int
tcp_usr_bind(struct socket * so,struct sockaddr * nam,struct proc * p)280 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
281 {
282 int error = 0;
283 struct inpcb *inp = sotoinpcb(so);
284 struct tcpcb *tp;
285 struct sockaddr_in *sinp;
286
287 COMMON_START_ALLOW_FLOW_DIVERT(true);
288
289 if (nam->sa_family != 0 && nam->sa_family != AF_INET) {
290 error = EAFNOSUPPORT;
291 goto out;
292 }
293 /*
294 * Must check for multicast and broadcast addresses and disallow binding
295 * to them.
296 */
297 sinp = (struct sockaddr_in *)(void *)nam;
298 if (sinp->sin_family == AF_INET &&
299 (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)) ||
300 sinp->sin_addr.s_addr == INADDR_BROADCAST)) {
301 error = EAFNOSUPPORT;
302 goto out;
303 }
304
305 error = in_pcbbind(inp, nam, p);
306 if (error) {
307 goto out;
308 }
309
310 #if NECP
311 /* Update NECP client with bind result if not in middle of connect */
312 if ((inp->inp_flags2 & INP2_CONNECT_IN_PROGRESS) &&
313 !uuid_is_null(inp->necp_client_uuid)) {
314 socket_unlock(so, 0);
315 necp_client_assign_from_socket(so->last_pid, inp->necp_client_uuid, inp);
316 socket_lock(so, 0);
317 }
318 #endif /* NECP */
319
320 COMMON_END(PRU_BIND);
321 }
322
323 static int
tcp6_usr_bind(struct socket * so,struct sockaddr * nam,struct proc * p)324 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
325 {
326 int error = 0;
327 struct inpcb *inp = sotoinpcb(so);
328 const uint8_t old_flags = inp->inp_vflag;
329 struct tcpcb *tp;
330 struct sockaddr_in6 *sin6p;
331
332 COMMON_START_ALLOW_FLOW_DIVERT(true);
333
334 if (nam->sa_family != 0 && nam->sa_family != AF_INET6) {
335 error = EAFNOSUPPORT;
336 goto out;
337 }
338 /*
339 * Must check for multicast and broadcast addresses and disallow binding
340 * to them.
341 */
342 sin6p = (struct sockaddr_in6 *)(void *)nam;
343 if (sin6p->sin6_family == AF_INET6 &&
344 (IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr) ||
345 ((IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr) ||
346 IN6_IS_ADDR_V4COMPAT(&sin6p->sin6_addr)) &&
347 (IN_MULTICAST(ntohl(sin6p->sin6_addr.s6_addr32[3])) ||
348 sin6p->sin6_addr.s6_addr32[3] == INADDR_BROADCAST)))) {
349 error = EAFNOSUPPORT;
350 goto out;
351 }
352
353 /*
354 * Another thread won the binding race so do not change inp_vflag
355 */
356 if (inp->inp_flags2 & INP2_BIND_IN_PROGRESS) {
357 error = EINVAL;
358 goto out;
359 }
360
361 inp->inp_vflag &= ~INP_IPV4;
362 inp->inp_vflag |= INP_IPV6;
363 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
364 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr)) {
365 inp->inp_vflag |= INP_IPV4;
366 } else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
367 struct sockaddr_in sin;
368
369 in6_sin6_2_sin(&sin, sin6p);
370 inp->inp_vflag |= INP_IPV4;
371 inp->inp_vflag &= ~INP_IPV6;
372
373 error = in_pcbbind(inp, (struct sockaddr *)&sin, p);
374 if (error != 0) {
375 inp->inp_vflag = old_flags;
376 route_clear(&inp->inp_route);
377 }
378 goto out;
379 }
380 }
381 error = in6_pcbbind(inp, nam, p);
382 if (error) {
383 inp->inp_vflag = old_flags;
384 route_clear(&inp->inp_route);
385 goto out;
386 }
387
388 COMMON_END(PRU_BIND);
389 }
390
391 /*
392 * Prepare to accept connections.
393 *
394 * Returns: 0 Success
395 * EINVAL [COMMON_START]
396 * in_pcbbind:EADDRNOTAVAIL Address not available.
397 * in_pcbbind:EINVAL Invalid argument
398 * in_pcbbind:EAFNOSUPPORT Address family not supported [notdef]
399 * in_pcbbind:EACCES Permission denied
400 * in_pcbbind:EADDRINUSE Address in use
401 * in_pcbbind:EAGAIN Resource unavailable, try again
402 * in_pcbbind:EPERM Operation not permitted
403 */
404 static int
tcp_usr_listen(struct socket * so,struct proc * p)405 tcp_usr_listen(struct socket *so, struct proc *p)
406 {
407 int error = 0;
408 struct inpcb *inp = sotoinpcb(so);
409 struct tcpcb *tp;
410
411 COMMON_START_ALLOW_FLOW_DIVERT(true);
412 if (inp->inp_lport == 0) {
413 error = in_pcbbind(inp, NULL, p);
414 }
415 if (error == 0) {
416 TCP_LOG_STATE(tp, TCPS_LISTEN);
417 tp->t_state = TCPS_LISTEN;
418 if (nstat_collect) {
419 nstat_pcb_event(inp, NSTAT_EVENT_SRC_FLOW_STATE_LISTEN);
420 }
421 }
422 TCP_LOG_LISTEN(tp, error);
423 COMMON_END(PRU_LISTEN);
424 }
425
426 static int
tcp6_usr_listen(struct socket * so,struct proc * p)427 tcp6_usr_listen(struct socket *so, struct proc *p)
428 {
429 int error = 0;
430 struct inpcb *inp = sotoinpcb(so);
431 struct tcpcb *tp;
432
433 COMMON_START_ALLOW_FLOW_DIVERT(true);
434 if (inp->inp_lport == 0) {
435 inp->inp_vflag &= ~INP_IPV4;
436 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
437 inp->inp_vflag |= INP_IPV4;
438 }
439 error = in6_pcbbind(inp, NULL, p);
440 }
441 if (error == 0) {
442 TCP_LOG_STATE(tp, TCPS_LISTEN);
443 tp->t_state = TCPS_LISTEN;
444 if (nstat_collect) {
445 nstat_pcb_event(inp, NSTAT_EVENT_SRC_FLOW_STATE_LISTEN);
446 }
447 }
448 TCP_LOG_LISTEN(tp, error);
449 COMMON_END(PRU_LISTEN);
450 }
451
452 static int
tcp_connect_complete(struct socket * so)453 tcp_connect_complete(struct socket *so)
454 {
455 struct tcpcb *tp = sototcpcb(so);
456 struct inpcb *inp = sotoinpcb(so);
457 int error = 0;
458
459 /* TFO delays the tcp_output until later, when the app calls write() */
460 if (so->so_flags1 & SOF1_PRECONNECT_DATA) {
461 if (!necp_socket_is_allowed_to_send_recv(sotoinpcb(so), NULL, 0, NULL, NULL, NULL, NULL)) {
462 TCP_LOG_DROP_NECP(NULL, NULL, tp, true);
463 return EHOSTUNREACH;
464 }
465
466 /* Initialize enough state so that we can actually send data */
467 tcp_mss(tp, -1, IFSCOPE_NONE);
468 tp->snd_wnd = tp->t_maxseg;
469 tp->max_sndwnd = tp->snd_wnd;
470 } else {
471 tp->t_flagsext |= TF_USR_OUTPUT;
472 error = tcp_output(tp);
473 tp->t_flagsext &= ~TF_USR_OUTPUT;
474 }
475
476 #if NECP
477 /* Update NECP client with connected five-tuple */
478 if (error == 0 && !uuid_is_null(inp->necp_client_uuid)) {
479 socket_unlock(so, 0);
480 necp_client_assign_from_socket(so->last_pid, inp->necp_client_uuid, inp);
481 socket_lock(so, 0);
482 }
483 #endif /* NECP */
484
485 return error;
486 }
487
488 __attribute__((noinline))
489 static void
tcp_log_address_error(int error,struct sockaddr * nam,struct proc * p)490 tcp_log_address_error(int error, struct sockaddr *nam, struct proc *p)
491 {
492 char buffer[MAX_IPv6_STR_LEN];
493
494 if (nam->sa_family == AF_INET6) {
495 struct sockaddr_in6 *sin6p = (struct sockaddr_in6 *)(void *)nam;
496
497 inet_ntop(AF_INET6, &sin6p->sin6_addr, buffer, sizeof(buffer));
498 } else {
499 struct sockaddr_in *sinp = (struct sockaddr_in *)(void *)nam;
500
501 inet_ntop(AF_INET, &sinp->sin_addr, buffer, sizeof(buffer));
502 }
503 if (p == NULL) {
504 p = current_proc();
505 }
506 os_log(OS_LOG_DEFAULT, "connect address error %d for %s process %s:%u",
507 error, buffer, proc_name_address(p), proc_pid(p));
508 }
509
510 /*
511 * Note that connecting to the all-zeros address is OK and is treated as the
512 * loopback address
513 */
514 static int
tcp_usr_connect_common(struct socket * so,struct tcpcb * tp,struct sockaddr * nam,struct proc * p,bool isipv6,bool need_connect_complete)515 tcp_usr_connect_common(struct socket *so, struct tcpcb *tp, struct sockaddr *nam,
516 struct proc *p, bool isipv6, bool need_connect_complete)
517 {
518 int error = 0;
519 struct inpcb *inp = sotoinpcb(so);
520
521 if (isipv6 == 0) {
522 struct sockaddr_in *sinp;
523
524 if (nam->sa_family != 0 && nam->sa_family != AF_INET) {
525 error = EAFNOSUPPORT;
526 goto out;
527 }
528 /*
529 * Disallow connecting to multicast and broadcast addresses.
530 */
531 sinp = (struct sockaddr_in *)(void *)nam;
532 if (sinp->sin_family == AF_INET &&
533 (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)) ||
534 sinp->sin_addr.s_addr == INADDR_BROADCAST)) {
535 error = EAFNOSUPPORT;
536 goto out;
537 }
538
539 if ((error = tcp_connect(tp, nam, p)) != 0) {
540 goto out;
541 }
542 } else {
543 struct sockaddr_in6 *sin6p;
544
545 if (nam->sa_family != 0 && nam->sa_family != AF_INET6) {
546 error = EAFNOSUPPORT;
547 goto out;
548 }
549
550 /*
551 * Disallow connecting to multicast and broadcast addresses.
552 */
553 sin6p = (struct sockaddr_in6 *)(void *)nam;
554 if (sin6p->sin6_family == AF_INET6 &&
555 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
556 error = EAFNOSUPPORT;
557 goto out;
558 }
559
560 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
561 struct sockaddr_in sin;
562
563 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
564 error = EINVAL;
565 goto out;
566 }
567
568 in6_sin6_2_sin(&sin, sin6p);
569 /*
570 * Disallow connecting to multicast and broadcast addresses.
571 */
572 if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr)) ||
573 sin.sin_addr.s_addr == INADDR_BROADCAST) {
574 error = EAFNOSUPPORT;
575 goto out;
576 }
577 inp->inp_vflag |= INP_IPV4;
578 inp->inp_vflag &= ~INP_IPV6;
579 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, p)) != 0) {
580 goto out;
581 }
582
583 goto out;
584 } else if (IN6_IS_ADDR_V4COMPAT(&sin6p->sin6_addr)) {
585 /*
586 * Disallow connecting to multicast and broadcast addresses.
587 */
588 if (IN_MULTICAST(ntohl(sin6p->sin6_addr.s6_addr32[3])) ||
589 sin6p->sin6_addr.s6_addr32[3] == INADDR_BROADCAST) {
590 error = EAFNOSUPPORT;
591 goto out;
592 }
593 }
594
595 inp->inp_vflag &= ~INP_IPV4;
596 inp->inp_vflag |= INP_IPV6;
597 if ((error = tcp6_connect(tp, nam, p)) != 0) {
598 goto out;
599 }
600 }
601 out:
602 if (need_connect_complete && error == 0) {
603 error = tcp_connect_complete(so);
604 }
605 TCP_LOG_CONNECT(tp, true, error);
606 if (error == EAFNOSUPPORT) {
607 tcp_log_address_error(error, nam, p);
608 }
609 return error;
610 }
611
612 /*
613 * Initiate connection to peer.
614 * Create a template for use in transmissions on this connection.
615 * Enter SYN_SENT state, and mark socket as connecting.
616 * Start keep-alive timer, and seed output sequence space.
617 * Send initial segment on connection.
618 */
619 static int
tcp_usr_connect(struct socket * so,struct sockaddr * nam,struct proc * p)620 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct proc *p)
621 {
622 int error = 0;
623 struct inpcb *inp = sotoinpcb(so);
624 struct tcpcb *tp;
625
626 TCPDEBUG0;
627 if (inp == NULL) {
628 return EINVAL;
629 } else if (inp->inp_state == INPCB_STATE_DEAD) {
630 if (so->so_error) {
631 error = so->so_error;
632 so->so_error = 0;
633 return error;
634 } else {
635 return EINVAL;
636 }
637 }
638 #if NECP
639 #if CONTENT_FILTER
640 error = cfil_sock_attach(so, NULL, nam, CFS_CONNECTION_DIR_OUT);
641 if (error != 0) {
642 return error;
643 }
644 #endif /* CONTENT_FILTER */
645 #if FLOW_DIVERT
646 if (necp_socket_should_use_flow_divert(inp)) {
647 error = flow_divert_pcb_init(so);
648 if (error == 0) {
649 error = flow_divert_connect_out(so, nam, p);
650 }
651 return error;
652 }
653 #endif /* FLOW_DIVERT */
654 #endif /* NECP */
655 tp = intotcpcb(inp);
656 TCPDEBUG1();
657
658 calculate_tcp_clock();
659
660 error = tcp_usr_connect_common(so, tp, nam, p, false, true);
661 if (error != 0) {
662 goto out;
663 }
664
665 COMMON_END(PRU_CONNECT);
666 }
667
668 static int
tcp_usr_connectx_common(struct socket * so,int af,struct sockaddr * src,struct sockaddr * dst,struct proc * p,uint32_t ifscope,sae_associd_t aid,sae_connid_t * pcid,uint32_t flags,void * arg,uint32_t arglen,struct uio * auio,user_ssize_t * bytes_written)669 tcp_usr_connectx_common(struct socket *so, int af,
670 struct sockaddr *src, struct sockaddr *dst,
671 struct proc *p, uint32_t ifscope, sae_associd_t aid, sae_connid_t *pcid,
672 uint32_t flags, void *arg, uint32_t arglen, struct uio *auio,
673 user_ssize_t *bytes_written)
674 {
675 #pragma unused(aid, flags, arg, arglen)
676 struct inpcb *inp = sotoinpcb(so);
677 int error = 0;
678 user_ssize_t datalen = 0;
679
680 if (inp == NULL) {
681 return EINVAL;
682 }
683
684 VERIFY(dst != NULL);
685
686 ASSERT(!(inp->inp_flags2 & INP2_CONNECT_IN_PROGRESS));
687 inp->inp_flags2 |= INP2_CONNECT_IN_PROGRESS;
688
689 #if NECP
690 inp_update_necp_policy(inp, src, dst, ifscope);
691 #endif /* NECP */
692
693 if ((so->so_flags1 & SOF1_DATA_IDEMPOTENT) &&
694 (tcp_fastopen & TCP_FASTOPEN_CLIENT)) {
695 sototcpcb(so)->t_flagsext |= TF_FASTOPEN;
696 }
697
698 /* bind socket to the specified interface, if requested */
699 if (ifscope != IFSCOPE_NONE &&
700 (error = inp_bindif(inp, ifscope, NULL)) != 0) {
701 goto done;
702 }
703
704 /* if source address and/or port is specified, bind to it */
705 if (src != NULL) {
706 error = sobindlock(so, src, 0); /* already locked */
707 if (error != 0) {
708 goto done;
709 }
710 }
711
712 switch (af) {
713 case AF_INET:
714 error = tcp_usr_connect(so, dst, p);
715 break;
716 case AF_INET6:
717 error = tcp6_usr_connect(so, dst, p);
718 break;
719 default:
720 VERIFY(0);
721 /* NOTREACHED */
722 }
723
724 if (error != 0) {
725 goto done;
726 }
727
728 /* if there is data, copy it */
729 if (auio != NULL) {
730 socket_unlock(so, 0);
731
732 VERIFY(bytes_written != NULL);
733
734 datalen = uio_resid(auio);
735 error = so->so_proto->pr_usrreqs->pru_sosend(so, NULL,
736 (uio_t)auio, NULL, NULL, 0);
737 socket_lock(so, 0);
738
739 if (error == 0 || error == EWOULDBLOCK) {
740 *bytes_written = datalen - uio_resid(auio);
741 }
742
743 /*
744 * sosend returns EWOULDBLOCK if it's a non-blocking
745 * socket or a timeout occured (this allows to return
746 * the amount of queued data through sendit()).
747 *
748 * However, connectx() returns EINPROGRESS in case of a
749 * blocking socket. So we change the return value here.
750 */
751 if (error == EWOULDBLOCK) {
752 error = EINPROGRESS;
753 }
754 }
755
756 if (error == 0 && pcid != NULL) {
757 *pcid = 1; /* there is only one connection in regular TCP */
758 }
759 done:
760 if (error && error != EINPROGRESS) {
761 so->so_flags1 &= ~SOF1_PRECONNECT_DATA;
762 }
763
764 inp->inp_flags2 &= ~INP2_CONNECT_IN_PROGRESS;
765 return error;
766 }
767
768 static int
tcp_usr_connectx(struct socket * so,struct sockaddr * src,struct sockaddr * dst,struct proc * p,uint32_t ifscope,sae_associd_t aid,sae_connid_t * pcid,uint32_t flags,void * arg,uint32_t arglen,struct uio * uio,user_ssize_t * bytes_written)769 tcp_usr_connectx(struct socket *so, struct sockaddr *src,
770 struct sockaddr *dst, struct proc *p, uint32_t ifscope,
771 sae_associd_t aid, sae_connid_t *pcid, uint32_t flags, void *arg,
772 uint32_t arglen, struct uio *uio, user_ssize_t *bytes_written)
773 {
774 return tcp_usr_connectx_common(so, AF_INET, src, dst, p, ifscope, aid,
775 pcid, flags, arg, arglen, uio, bytes_written);
776 }
777
778 static int
tcp6_usr_connect(struct socket * so,struct sockaddr * nam,struct proc * p)779 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct proc *p)
780 {
781 int error = 0;
782 struct inpcb *inp = sotoinpcb(so);
783 struct tcpcb *tp;
784
785 TCPDEBUG0;
786 if (inp == NULL) {
787 return EINVAL;
788 } else if (inp->inp_state == INPCB_STATE_DEAD) {
789 if (so->so_error) {
790 error = so->so_error;
791 so->so_error = 0;
792 return error;
793 } else {
794 return EINVAL;
795 }
796 }
797 #if NECP
798 #if CONTENT_FILTER
799 error = cfil_sock_attach(so, NULL, nam, CFS_CONNECTION_DIR_OUT);
800 if (error != 0) {
801 return error;
802 }
803 #endif /* CONTENT_FILTER */
804 #if FLOW_DIVERT
805 if (necp_socket_should_use_flow_divert(inp)) {
806 error = flow_divert_pcb_init(so);
807 if (error == 0) {
808 error = flow_divert_connect_out(so, nam, p);
809 }
810 return error;
811 }
812 #endif /* FLOW_DIVERT */
813 #endif /* NECP */
814
815 tp = intotcpcb(inp);
816 TCPDEBUG1();
817
818 calculate_tcp_clock();
819
820 error = tcp_usr_connect_common(so, tp, nam, p, true, true);
821 if (error != 0) {
822 route_clear(&inp->inp_route);
823 goto out;
824 }
825
826 COMMON_END(PRU_CONNECT);
827 }
828
829 static int
tcp6_usr_connectx(struct socket * so,struct sockaddr * src,struct sockaddr * dst,struct proc * p,uint32_t ifscope,sae_associd_t aid,sae_connid_t * pcid,uint32_t flags,void * arg,uint32_t arglen,struct uio * uio,user_ssize_t * bytes_written)830 tcp6_usr_connectx(struct socket *so, struct sockaddr*src,
831 struct sockaddr *dst, struct proc *p, uint32_t ifscope,
832 sae_associd_t aid, sae_connid_t *pcid, uint32_t flags, void *arg,
833 uint32_t arglen, struct uio *uio, user_ssize_t *bytes_written)
834 {
835 return tcp_usr_connectx_common(so, AF_INET6, src, dst, p, ifscope, aid,
836 pcid, flags, arg, arglen, uio, bytes_written);
837 }
838
839 /*
840 * Initiate disconnect from peer.
841 * If connection never passed embryonic stage, just drop;
842 * else if don't need to let data drain, then can just drop anyways,
843 * else have to begin TCP shutdown process: mark socket disconnecting,
844 * drain unread data, state switch to reflect user close, and
845 * send segment (e.g. FIN) to peer. Socket will be really disconnected
846 * when peer sends FIN and acks ours.
847 *
848 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
849 */
850 static int
tcp_usr_disconnect(struct socket * so)851 tcp_usr_disconnect(struct socket *so)
852 {
853 int error = 0;
854 struct inpcb *inp = sotoinpcb(so);
855 struct tcpcb *tp;
856
857 socket_lock_assert_owned(so);
858 COMMON_START();
859 /* In case we got disconnected from the peer */
860 if (tp == NULL) {
861 goto out;
862 }
863 tp = tcp_disconnect(tp);
864 COMMON_END(PRU_DISCONNECT);
865 }
866
867 /*
868 * User-protocol pru_disconnectx callback.
869 */
870 static int
tcp_usr_disconnectx(struct socket * so,sae_associd_t aid,sae_connid_t cid)871 tcp_usr_disconnectx(struct socket *so, sae_associd_t aid, sae_connid_t cid)
872 {
873 #pragma unused(cid)
874 if (aid != SAE_ASSOCID_ANY && aid != SAE_ASSOCID_ALL) {
875 return EINVAL;
876 }
877
878 return tcp_usr_disconnect(so);
879 }
880
881 /*
882 * Accept a connection. Essentially all the work is
883 * done at higher levels; just return the address
884 * of the peer, storing through addr.
885 */
886 static int
tcp_usr_accept(struct socket * so,struct sockaddr ** nam)887 tcp_usr_accept(struct socket *so, struct sockaddr **nam)
888 {
889 int error = 0;
890 struct inpcb *inp = sotoinpcb(so);
891 struct tcpcb *tp = NULL;
892 TCPDEBUG0;
893
894 in_getpeeraddr(so, nam);
895
896 if (so->so_state & SS_ISDISCONNECTED) {
897 error = ECONNABORTED;
898 goto out;
899 }
900 if (inp == NULL || inp->inp_state == INPCB_STATE_DEAD) {
901 return EINVAL;
902 }
903 #if NECP
904 else if (necp_socket_should_use_flow_divert(inp)) {
905 return EPROTOTYPE;
906 }
907
908 #endif /* NECP */
909
910 tp = intotcpcb(inp);
911 TCPDEBUG1();
912
913 TCP_LOG_ACCEPT(tp, 0);
914
915 calculate_tcp_clock();
916
917 COMMON_END(PRU_ACCEPT);
918 }
919
920 static int
tcp6_usr_accept(struct socket * so,struct sockaddr ** nam)921 tcp6_usr_accept(struct socket *so, struct sockaddr **nam)
922 {
923 int error = 0;
924 struct inpcb *inp = sotoinpcb(so);
925 struct tcpcb *tp = NULL;
926 TCPDEBUG0;
927
928 if (so->so_state & SS_ISDISCONNECTED) {
929 error = ECONNABORTED;
930 goto out;
931 }
932 if (inp == NULL || inp->inp_state == INPCB_STATE_DEAD) {
933 return EINVAL;
934 }
935 #if NECP
936 else if (necp_socket_should_use_flow_divert(inp)) {
937 return EPROTOTYPE;
938 }
939
940 #endif /* NECP */
941
942 tp = intotcpcb(inp);
943 TCPDEBUG1();
944
945 TCP_LOG_ACCEPT(tp, 0);
946
947 calculate_tcp_clock();
948
949 in6_mapped_peeraddr(so, nam);
950 COMMON_END(PRU_ACCEPT);
951 }
952
953 /*
954 * Mark the connection as being incapable of further output.
955 *
956 * Returns: 0 Success
957 * EINVAL [COMMON_START]
958 * tcp_output:EADDRNOTAVAIL
959 * tcp_output:ENOBUFS
960 * tcp_output:EMSGSIZE
961 * tcp_output:EHOSTUNREACH
962 * tcp_output:ENETUNREACH
963 * tcp_output:ENETDOWN
964 * tcp_output:ENOMEM
965 * tcp_output:EACCES
966 * tcp_output:EMSGSIZE
967 * tcp_output:ENOBUFS
968 * tcp_output:??? [ignorable: mostly IPSEC/firewall/DLIL]
969 */
970 static int
tcp_usr_shutdown(struct socket * so)971 tcp_usr_shutdown(struct socket *so)
972 {
973 int error = 0;
974 struct inpcb *inp = sotoinpcb(so);
975 struct tcpcb *tp;
976
977 TCPDEBUG0;
978 if (inp == NULL || inp->inp_state == INPCB_STATE_DEAD) {
979 return EINVAL;
980 }
981
982 socantsendmore(so);
983
984 /*
985 * In case we got disconnected from the peer, or if this is
986 * a socket that is to be flow-diverted (but not yet).
987 */
988 tp = intotcpcb(inp);
989 TCPDEBUG1();
990
991 if (tp == NULL
992 #if NECP
993 || (necp_socket_should_use_flow_divert(inp))
994 #endif /* NECP */
995 ) {
996 if (tp != NULL) {
997 error = EPROTOTYPE;
998 }
999 goto out;
1000 }
1001
1002 calculate_tcp_clock();
1003
1004 tp = tcp_usrclosed(tp);
1005 #if MPTCP
1006 /* A reset has been sent but socket exists, do not send FIN */
1007 if ((so->so_flags & SOF_MP_SUBFLOW) &&
1008 (tp) && (tp->t_mpflags & TMPF_RESET)) {
1009 goto out;
1010 }
1011 #endif
1012 #if CONTENT_FILTER
1013 /* Don't send a FIN yet */
1014 if (tp && !(so->so_state & SS_ISDISCONNECTED) &&
1015 cfil_sock_data_pending(&so->so_snd)) {
1016 goto out;
1017 }
1018 #endif /* CONTENT_FILTER */
1019 if (tp) {
1020 error = tcp_output(tp);
1021 }
1022 COMMON_END(PRU_SHUTDOWN);
1023 }
1024
1025 /*
1026 * After a receive, possibly send window update to peer.
1027 */
1028 static int
tcp_usr_rcvd(struct socket * so,int flags)1029 tcp_usr_rcvd(struct socket *so, int flags)
1030 {
1031 int error = 0;
1032 struct inpcb *inp = sotoinpcb(so);
1033 struct tcpcb *tp;
1034
1035 COMMON_START();
1036 /* In case we got disconnected from the peer */
1037 if (tp == NULL) {
1038 goto out;
1039 }
1040 tcp_sbrcv_trim(tp, &so->so_rcv);
1041
1042 if ((flags & MSG_WAITALL) && SEQ_LT(tp->last_ack_sent, tp->rcv_nxt)) {
1043 tp->t_flags |= TF_ACKNOW;
1044 }
1045
1046 /*
1047 * This tcp_output is solely there to trigger window-updates.
1048 * However, we really do not want these window-updates while we
1049 * are still in SYN_SENT or SYN_RECEIVED.
1050 */
1051 if (TCPS_HAVEESTABLISHED(tp->t_state)) {
1052 tcp_output(tp);
1053 }
1054
1055 #if CONTENT_FILTER
1056 cfil_sock_buf_update(&so->so_rcv);
1057 #endif /* CONTENT_FILTER */
1058
1059 COMMON_END(PRU_RCVD);
1060 }
1061
1062 __attribute__((noinline))
1063 static int
tcp_send_implied_connect(struct socket * so,struct tcpcb * tp,struct sockaddr * nam,struct proc * p,bool isipv6)1064 tcp_send_implied_connect(struct socket *so, struct tcpcb *tp, struct sockaddr *nam,
1065 struct proc *p, bool isipv6)
1066 {
1067 int error = 0;
1068
1069 error = tcp_usr_connect_common(so, tp, nam, p, isipv6, false);
1070 if (error != 0) {
1071 goto out;
1072 }
1073 /*
1074 * initialize window to default value, and
1075 * initialize maxseg/maxopd using peer's cached
1076 * MSS.
1077 */
1078 tp->snd_wnd = TTCP_CLIENT_SND_WND;
1079 tp->max_sndwnd = tp->snd_wnd;
1080 tcp_mss(tp, -1, IFSCOPE_NONE);
1081 out:
1082 return error;
1083 }
1084
1085 __attribute__((noinline))
1086 static void
mpkl_tcp_send(struct socket * so,struct tcpcb * tp,uint32_t mpkl_seq,uint32_t mpkl_len,struct so_mpkl_send_info * mpkl_send_info)1087 mpkl_tcp_send(struct socket *so, struct tcpcb *tp, uint32_t mpkl_seq, uint32_t mpkl_len,
1088 struct so_mpkl_send_info *mpkl_send_info)
1089 {
1090 struct inpcb *inp = tp->t_inpcb;
1091
1092 if (inp == NULL) {
1093 return;
1094 }
1095
1096 if ((inp->inp_last_outifp != NULL &&
1097 (inp->inp_last_outifp->if_xflags & IFXF_MPK_LOG)) ||
1098 (inp->inp_boundifp != NULL &&
1099 (inp->inp_boundifp->if_xflags & IFXF_MPK_LOG))) {
1100 MPKL_TCP_SEND(tcp_mpkl_log_object,
1101 mpkl_send_info->mpkl_proto,
1102 mpkl_send_info->mpkl_uuid,
1103 ntohs(inp->inp_lport),
1104 ntohs(inp->inp_fport),
1105 mpkl_seq,
1106 mpkl_len,
1107 so->last_pid,
1108 so->so_log_seqn++);
1109 }
1110 }
1111
1112 /*
1113 * Do a send by putting data in output queue and updating urgent
1114 * marker if URG set. Possibly send more data. Unlike the other
1115 * pru_*() routines, the mbuf chains are our responsibility. We
1116 * must either enqueue them or free them. The other pru_* routines
1117 * generally are caller-frees.
1118 *
1119 * Returns: 0 Success
1120 * ECONNRESET
1121 * EINVAL
1122 * ENOBUFS
1123 * tcp_connect:EADDRINUSE Address in use
1124 * tcp_connect:EADDRNOTAVAIL Address not available.
1125 * tcp_connect:EINVAL Invalid argument
1126 * tcp_connect:EAFNOSUPPORT Address family not supported [notdef]
1127 * tcp_connect:EACCES Permission denied
1128 * tcp_connect:EAGAIN Resource unavailable, try again
1129 * tcp_connect:EPERM Operation not permitted
1130 * tcp_output:EADDRNOTAVAIL
1131 * tcp_output:ENOBUFS
1132 * tcp_output:EMSGSIZE
1133 * tcp_output:EHOSTUNREACH
1134 * tcp_output:ENETUNREACH
1135 * tcp_output:ENETDOWN
1136 * tcp_output:ENOMEM
1137 * tcp_output:EACCES
1138 * tcp_output:EMSGSIZE
1139 * tcp_output:ENOBUFS
1140 * tcp_output:??? [ignorable: mostly IPSEC/firewall/DLIL]
1141 * tcp6_connect:??? [IPV6 only]
1142 */
1143 static int
tcp_usr_send(struct socket * so,int flags,struct mbuf * m,struct sockaddr * nam,struct mbuf * control,struct proc * p)1144 tcp_usr_send(struct socket *so, int flags, struct mbuf *m,
1145 struct sockaddr *nam, struct mbuf *control, struct proc *p)
1146 {
1147 int error = 0;
1148 struct inpcb *inp = sotoinpcb(so);
1149 struct tcpcb *tp;
1150 uint32_t mpkl_len = 0; /* length of mbuf chain */
1151 uint32_t mpkl_seq = 0; /* sequence number where new data is added */
1152 struct so_mpkl_send_info mpkl_send_info = {};
1153 bool isipv6;
1154
1155 TCPDEBUG0;
1156
1157 if (inp == NULL || inp->inp_state == INPCB_STATE_DEAD
1158 #if NECP
1159 || (necp_socket_should_use_flow_divert(inp))
1160 #endif /* NECP */
1161 ) {
1162 /*
1163 * OOPS! we lost a race, the TCP session got reset after
1164 * we checked SS_CANTSENDMORE, eg: while doing uiomove or a
1165 * network interrupt in the non-splnet() section of sosend().
1166 */
1167 if (m != NULL) {
1168 m_freem(m);
1169 }
1170 if (control != NULL) {
1171 m_freem(control);
1172 control = NULL;
1173 }
1174
1175 if (inp == NULL || inp->inp_state == INPCB_STATE_DEAD) {
1176 error = ECONNRESET; /* XXX EPIPE? */
1177 } else {
1178 error = EPROTOTYPE;
1179 }
1180 tp = NULL;
1181 TCPDEBUG1();
1182 goto out;
1183 }
1184 isipv6 = nam && nam->sa_family == AF_INET6 ? true : false;
1185 tp = intotcpcb(inp);
1186 TCPDEBUG1();
1187
1188 calculate_tcp_clock();
1189
1190 if (net_mpklog_enabled) {
1191 mpkl_seq = tp->snd_una + so->so_snd.sb_cc;
1192 if (m) {
1193 mpkl_len = m_length(m);
1194 }
1195 if (so->so_flags1 & SOF1_MPKL_SEND_INFO) {
1196 uuid_copy(mpkl_send_info.mpkl_uuid, so->so_mpkl_send_uuid);
1197 mpkl_send_info.mpkl_proto = so->so_mpkl_send_proto;
1198 }
1199 }
1200
1201 if (control != NULL) {
1202 if (control->m_len > 0 && net_mpklog_enabled) {
1203 error = tcp_get_mpkl_send_info(control, &mpkl_send_info);
1204 /*
1205 * Intepretation of the returned code:
1206 * 0: client wants us to use value passed in SCM_MPKL_SEND_INFO
1207 * 1: SCM_MPKL_SEND_INFO was not present
1208 * other: failure
1209 */
1210 if (error != 0 && error != ENOMSG) {
1211 m_freem(control);
1212 if (m != NULL) {
1213 m_freem(m);
1214 }
1215 control = NULL;
1216 m = NULL;
1217 goto out;
1218 }
1219 }
1220 /*
1221 * Silently drop unsupported ancillary data messages
1222 */
1223 m_freem(control);
1224 control = NULL;
1225 }
1226
1227 /* MPTCP sublow socket buffers must not be compressed */
1228 VERIFY(!(so->so_flags & SOF_MP_SUBFLOW) ||
1229 (so->so_snd.sb_flags & SB_NOCOMPRESS));
1230
1231 if (!(flags & PRUS_OOB) || (so->so_flags1 & SOF1_PRECONNECT_DATA)) {
1232 sbappendstream(&so->so_snd, m);
1233
1234 if (nam && tp->t_state < TCPS_SYN_SENT) {
1235 /*
1236 * Do implied connect if not yet connected,
1237 */
1238 error = tcp_send_implied_connect(so, tp, nam, p, isipv6);
1239 if (error != 0) {
1240 goto out;
1241 }
1242 /* The sequence number of the data is past the SYN */
1243 mpkl_seq = tp->iss + 1;
1244 }
1245
1246 if (flags & PRUS_EOF) {
1247 /*
1248 * Close the send side of the connection after
1249 * the data is sent.
1250 */
1251 socantsendmore(so);
1252 tp = tcp_usrclosed(tp);
1253 }
1254 if (tp != NULL) {
1255 if (flags & PRUS_MORETOCOME) {
1256 tp->t_flags |= TF_MORETOCOME;
1257 }
1258 tp->t_flagsext |= TF_USR_OUTPUT;
1259 error = tcp_output(tp);
1260 tp->t_flagsext &= ~TF_USR_OUTPUT;
1261 if (flags & PRUS_MORETOCOME) {
1262 tp->t_flags &= ~TF_MORETOCOME;
1263 }
1264 }
1265 } else {
1266 if (sbspace(&so->so_snd) == 0) {
1267 /* if no space is left in sockbuf,
1268 * do not try to squeeze in OOB traffic */
1269 m_freem(m);
1270 error = ENOBUFS;
1271 goto out;
1272 }
1273 /*
1274 * According to RFC961 (Assigned Protocols),
1275 * the urgent pointer points to the last octet
1276 * of urgent data. We continue, however,
1277 * to consider it to indicate the first octet
1278 * of data past the urgent section.
1279 * Otherwise, snd_up should be one lower.
1280 */
1281 sbappendstream(&so->so_snd, m);
1282 if (nam && tp->t_state < TCPS_SYN_SENT) {
1283 /*
1284 * Do implied connect if not yet connected,
1285 * initialize window to default value, and
1286 * initialize maxseg/maxopd using peer's cached
1287 * MSS.
1288 */
1289 error = tcp_send_implied_connect(so, tp, nam, p, isipv6);
1290 if (error != 0) {
1291 goto out;
1292 }
1293 }
1294 tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
1295 tp->t_flagsext |= TF_FORCE;
1296 tp->t_flagsext |= TF_USR_OUTPUT;
1297 error = tcp_output(tp);
1298 tp->t_flagsext &= ~TF_USR_OUTPUT;
1299 tp->t_flagsext &= ~TF_FORCE;
1300 }
1301
1302 if (net_mpklog_enabled) {
1303 mpkl_tcp_send(so, tp, mpkl_seq, mpkl_len, &mpkl_send_info);
1304 }
1305
1306 /*
1307 * We wait for the socket to successfully connect before returning.
1308 * This allows us to signal a timeout to the application.
1309 */
1310 if (so->so_state & SS_ISCONNECTING) {
1311 if (so->so_state & SS_NBIO) {
1312 error = EWOULDBLOCK;
1313 } else {
1314 error = sbwait(&so->so_snd);
1315 }
1316 }
1317
1318 COMMON_END((flags & PRUS_OOB) ? PRU_SENDOOB :
1319 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
1320 }
1321
1322 /*
1323 * Abort the TCP.
1324 */
1325 static int
tcp_usr_abort(struct socket * so)1326 tcp_usr_abort(struct socket *so)
1327 {
1328 int error = 0;
1329 struct inpcb *inp = sotoinpcb(so);
1330 struct tcpcb *tp;
1331
1332 COMMON_START();
1333 /* In case we got disconnected from the peer */
1334 if (tp == NULL) {
1335 goto out;
1336 }
1337 tp = tcp_drop(tp, ECONNABORTED);
1338 VERIFY(so->so_usecount > 0);
1339 so->so_usecount--;
1340 COMMON_END(PRU_ABORT);
1341 }
1342
1343 /*
1344 * Receive out-of-band data.
1345 *
1346 * Returns: 0 Success
1347 * EINVAL [COMMON_START]
1348 * EINVAL
1349 * EWOULDBLOCK
1350 */
1351 static int
tcp_usr_rcvoob(struct socket * so,struct mbuf * m,int flags)1352 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags)
1353 {
1354 int error = 0;
1355 struct inpcb *inp = sotoinpcb(so);
1356 struct tcpcb *tp;
1357
1358 COMMON_START();
1359 if ((so->so_oobmark == 0 &&
1360 (so->so_state & SS_RCVATMARK) == 0) ||
1361 so->so_options & SO_OOBINLINE ||
1362 tp->t_oobflags & TCPOOB_HADDATA) {
1363 error = EINVAL;
1364 goto out;
1365 }
1366 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
1367 error = EWOULDBLOCK;
1368 goto out;
1369 }
1370 m->m_len = 1;
1371 *mtod(m, caddr_t) = tp->t_iobc;
1372 so->so_state &= ~SS_RCVATMARK;
1373 if ((flags & MSG_PEEK) == 0) {
1374 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
1375 }
1376 COMMON_END(PRU_RCVOOB);
1377 }
1378
1379 static int
tcp_usr_preconnect(struct socket * so)1380 tcp_usr_preconnect(struct socket *so)
1381 {
1382 struct inpcb *inp = sotoinpcb(so);
1383 int error = 0;
1384
1385 #if NECP
1386 if (necp_socket_should_use_flow_divert(inp)) {
1387 /* May happen, if in tcp_usr_connect we did not had a chance
1388 * to set the usrreqs (due to some error). So, let's get out
1389 * of here.
1390 */
1391 goto out;
1392 }
1393 #endif /* NECP */
1394
1395 error = tcp_output(sototcpcb(so));
1396
1397 soclearfastopen(so);
1398
1399 COMMON_END(PRU_PRECONNECT);
1400 }
1401
1402 /* xxx - should be const */
1403 struct pr_usrreqs tcp_usrreqs = {
1404 .pru_abort = tcp_usr_abort,
1405 .pru_accept = tcp_usr_accept,
1406 .pru_attach = tcp_usr_attach,
1407 .pru_bind = tcp_usr_bind,
1408 .pru_connect = tcp_usr_connect,
1409 .pru_connectx = tcp_usr_connectx,
1410 .pru_control = in_control,
1411 .pru_detach = tcp_usr_detach,
1412 .pru_disconnect = tcp_usr_disconnect,
1413 .pru_disconnectx = tcp_usr_disconnectx,
1414 .pru_listen = tcp_usr_listen,
1415 .pru_peeraddr = in_getpeeraddr,
1416 .pru_rcvd = tcp_usr_rcvd,
1417 .pru_rcvoob = tcp_usr_rcvoob,
1418 .pru_send = tcp_usr_send,
1419 .pru_shutdown = tcp_usr_shutdown,
1420 .pru_sockaddr = in_getsockaddr,
1421 .pru_sosend = sosend,
1422 .pru_soreceive = soreceive,
1423 .pru_preconnect = tcp_usr_preconnect,
1424 };
1425
1426 struct pr_usrreqs tcp6_usrreqs = {
1427 .pru_abort = tcp_usr_abort,
1428 .pru_accept = tcp6_usr_accept,
1429 .pru_attach = tcp_usr_attach,
1430 .pru_bind = tcp6_usr_bind,
1431 .pru_connect = tcp6_usr_connect,
1432 .pru_connectx = tcp6_usr_connectx,
1433 .pru_control = in6_control,
1434 .pru_detach = tcp_usr_detach,
1435 .pru_disconnect = tcp_usr_disconnect,
1436 .pru_disconnectx = tcp_usr_disconnectx,
1437 .pru_listen = tcp6_usr_listen,
1438 .pru_peeraddr = in6_mapped_peeraddr,
1439 .pru_rcvd = tcp_usr_rcvd,
1440 .pru_rcvoob = tcp_usr_rcvoob,
1441 .pru_send = tcp_usr_send,
1442 .pru_shutdown = tcp_usr_shutdown,
1443 .pru_sockaddr = in6_mapped_sockaddr,
1444 .pru_sosend = sosend,
1445 .pru_soreceive = soreceive,
1446 .pru_preconnect = tcp_usr_preconnect,
1447 };
1448
1449 /*
1450 * Common subroutine to open a TCP connection to remote host specified
1451 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local
1452 * port number if needed. Call in_pcbladdr to do the routing and to choose
1453 * a local host address (interface). If there is an existing incarnation
1454 * of the same connection in TIME-WAIT state and if the remote host was
1455 * sending CC options and if the connection duration was < MSL, then
1456 * truncate the previous TIME-WAIT state and proceed.
1457 * Initialize connection parameters and enter SYN-SENT state.
1458 *
1459 * Returns: 0 Success
1460 * EADDRINUSE
1461 * EINVAL
1462 * in_pcbbind:EADDRNOTAVAIL Address not available.
1463 * in_pcbbind:EINVAL Invalid argument
1464 * in_pcbbind:EAFNOSUPPORT Address family not supported [notdef]
1465 * in_pcbbind:EACCES Permission denied
1466 * in_pcbbind:EADDRINUSE Address in use
1467 * in_pcbbind:EAGAIN Resource unavailable, try again
1468 * in_pcbbind:EPERM Operation not permitted
1469 * in_pcbladdr:EINVAL Invalid argument
1470 * in_pcbladdr:EAFNOSUPPORT Address family not supported
1471 * in_pcbladdr:EADDRNOTAVAIL Address not available
1472 */
1473 static int
tcp_connect(struct tcpcb * tp,struct sockaddr * nam,struct proc * p)1474 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct proc *p)
1475 {
1476 struct inpcb *inp = tp->t_inpcb, *oinp;
1477 struct socket *so = inp->inp_socket;
1478 struct tcpcb *otp;
1479 struct sockaddr_in *sin = (struct sockaddr_in *)(void *)nam;
1480 struct in_addr laddr;
1481 int error = 0;
1482 struct ifnet *outif = NULL;
1483
1484 if (inp->inp_lport == 0) {
1485 error = in_pcbbind(inp, NULL, p);
1486 if (error) {
1487 goto done;
1488 }
1489 }
1490
1491 /*
1492 * Cannot simply call in_pcbconnect, because there might be an
1493 * earlier incarnation of this same connection still in
1494 * TIME_WAIT state, creating an ADDRINUSE error.
1495 */
1496 error = in_pcbladdr(inp, nam, &laddr, IFSCOPE_NONE, &outif, 0);
1497 if (error) {
1498 goto done;
1499 }
1500
1501 socket_unlock(inp->inp_socket, 0);
1502 oinp = in_pcblookup_hash(inp->inp_pcbinfo,
1503 sin->sin_addr, sin->sin_port,
1504 inp->inp_laddr.s_addr != INADDR_ANY ? inp->inp_laddr : laddr,
1505 inp->inp_lport, 0, NULL);
1506
1507 socket_lock(inp->inp_socket, 0);
1508 if (oinp) {
1509 if (oinp != inp) { /* 4143933: avoid deadlock if inp == oinp */
1510 socket_lock(oinp->inp_socket, 1);
1511 }
1512 if (in_pcb_checkstate(oinp, WNT_RELEASE, 1) == WNT_STOPUSING) {
1513 if (oinp != inp) {
1514 socket_unlock(oinp->inp_socket, 1);
1515 }
1516 goto skip_oinp;
1517 }
1518
1519 if (oinp != inp && (otp = intotcpcb(oinp)) != NULL &&
1520 otp->t_state == TCPS_TIME_WAIT &&
1521 ((int)(tcp_now - otp->t_starttime)) < tcp_msl &&
1522 (otp->t_flags & TF_RCVD_CC)) {
1523 otp = tcp_close(otp);
1524 } else {
1525 printf("tcp_connect: inp=0x%llx err=EADDRINUSE\n",
1526 (uint64_t)VM_KERNEL_ADDRPERM(inp));
1527 if (oinp != inp) {
1528 socket_unlock(oinp->inp_socket, 1);
1529 }
1530 error = EADDRINUSE;
1531 goto done;
1532 }
1533 if (oinp != inp) {
1534 socket_unlock(oinp->inp_socket, 1);
1535 }
1536 }
1537 skip_oinp:
1538 if ((inp->inp_laddr.s_addr == INADDR_ANY ? laddr.s_addr :
1539 inp->inp_laddr.s_addr) == sin->sin_addr.s_addr &&
1540 inp->inp_lport == sin->sin_port) {
1541 error = EINVAL;
1542 goto done;
1543 }
1544 #if SKYWALK
1545 if (!NETNS_TOKEN_VALID(&inp->inp_netns_token)) {
1546 error = netns_reserve_in(&inp->inp_netns_token,
1547 inp->inp_laddr.s_addr != INADDR_ANY ?
1548 inp->inp_laddr : laddr,
1549 IPPROTO_TCP, inp->inp_lport, NETNS_BSD, NULL);
1550 if (error) {
1551 goto done;
1552 }
1553 }
1554 #endif /* SKYWALK */
1555 if (!lck_rw_try_lock_exclusive(&inp->inp_pcbinfo->ipi_lock)) {
1556 /*lock inversion issue, mostly with udp multicast packets */
1557 socket_unlock(inp->inp_socket, 0);
1558 lck_rw_lock_exclusive(&inp->inp_pcbinfo->ipi_lock);
1559 socket_lock(inp->inp_socket, 0);
1560 }
1561 if (inp->inp_laddr.s_addr == INADDR_ANY) {
1562 inp->inp_laddr = laddr;
1563 /* no reference needed */
1564 inp->inp_last_outifp = outif;
1565 #if SKYWALK
1566 if (NETNS_TOKEN_VALID(&inp->inp_netns_token)) {
1567 netns_set_ifnet(&inp->inp_netns_token, inp->inp_last_outifp);
1568 }
1569 #endif /* SKYWALK */
1570
1571 inp->inp_flags |= INP_INADDR_ANY;
1572 }
1573 inp->inp_faddr = sin->sin_addr;
1574 inp->inp_fport = sin->sin_port;
1575 in_pcbrehash(inp);
1576 lck_rw_done(&inp->inp_pcbinfo->ipi_lock);
1577
1578 if (inp->inp_flowhash == 0) {
1579 inp_calc_flowhash(inp);
1580 ASSERT(inp->inp_flowhash != 0);
1581 }
1582
1583 tcp_set_max_rwinscale(tp, so);
1584
1585 soisconnecting(so);
1586 tcpstat.tcps_connattempt++;
1587 TCP_LOG_STATE(tp, TCPS_SYN_SENT);
1588 tp->t_state = TCPS_SYN_SENT;
1589 tp->t_timer[TCPT_KEEP] = OFFSET_FROM_START(tp, TCP_CONN_KEEPINIT(tp));
1590 tp->iss = tcp_new_isn(tp);
1591 tcp_sendseqinit(tp);
1592 tp->t_connect_time = tcp_now;
1593 if (nstat_collect) {
1594 nstat_pcb_event(inp, NSTAT_EVENT_SRC_FLOW_STATE_OUTBOUND);
1595 nstat_route_connect_attempt(inp->inp_route.ro_rt);
1596 }
1597
1598 tcp_add_fsw_flow(tp, outif);
1599
1600 done:
1601 if (outif != NULL) {
1602 ifnet_release(outif);
1603 }
1604
1605 return error;
1606 }
1607
1608 static int
tcp6_connect(struct tcpcb * tp,struct sockaddr * nam,struct proc * p)1609 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct proc *p)
1610 {
1611 struct inpcb *inp = tp->t_inpcb, *oinp;
1612 struct socket *so = inp->inp_socket;
1613 struct tcpcb *otp;
1614 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)(void *)nam;
1615 struct in6_addr addr6;
1616 int error = 0;
1617 struct ifnet *outif = NULL;
1618
1619 if (inp->inp_lport == 0) {
1620 error = in6_pcbbind(inp, NULL, p);
1621 if (error) {
1622 goto done;
1623 }
1624 }
1625
1626 /*
1627 * Cannot simply call in_pcbconnect, because there might be an
1628 * earlier incarnation of this same connection still in
1629 * TIME_WAIT state, creating an ADDRINUSE error.
1630 *
1631 * in6_pcbladdr() might return an ifp with its reference held
1632 * even in the error case, so make sure that it's released
1633 * whenever it's non-NULL.
1634 */
1635 error = in6_pcbladdr(inp, nam, &addr6, &outif);
1636 if (error) {
1637 goto done;
1638 }
1639 socket_unlock(inp->inp_socket, 0);
1640
1641 uint32_t lifscope = IFSCOPE_NONE;
1642 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
1643 lifscope = inp->inp_lifscope;
1644 } else if (sin6->sin6_scope_id != IFSCOPE_NONE) {
1645 lifscope = sin6->sin6_scope_id;
1646 } else if (outif != NULL) {
1647 lifscope = outif->if_index;
1648 }
1649 oinp = in6_pcblookup_hash(inp->inp_pcbinfo,
1650 &sin6->sin6_addr, sin6->sin6_port, sin6->sin6_scope_id,
1651 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
1652 ? &addr6
1653 : &inp->in6p_laddr,
1654 inp->inp_lport, lifscope, 0, NULL);
1655 socket_lock(inp->inp_socket, 0);
1656 if (oinp) {
1657 if (oinp != inp && (otp = intotcpcb(oinp)) != NULL &&
1658 otp->t_state == TCPS_TIME_WAIT &&
1659 ((int)(tcp_now - otp->t_starttime)) < tcp_msl &&
1660 (otp->t_flags & TF_RCVD_CC)) {
1661 otp = tcp_close(otp);
1662 } else {
1663 error = EADDRINUSE;
1664 goto done;
1665 }
1666 }
1667 #if SKYWALK
1668 if (!NETNS_TOKEN_VALID(&inp->inp_netns_token)) {
1669 error = netns_reserve_in6(&inp->inp_netns_token,
1670 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) ?
1671 addr6 : inp->in6p_laddr,
1672 IPPROTO_TCP, inp->inp_lport, NETNS_BSD, NULL);
1673 if (error) {
1674 goto done;
1675 }
1676 }
1677 #endif /* SKYWALK */
1678 if (!lck_rw_try_lock_exclusive(&inp->inp_pcbinfo->ipi_lock)) {
1679 /*lock inversion issue, mostly with udp multicast packets */
1680 socket_unlock(inp->inp_socket, 0);
1681 lck_rw_lock_exclusive(&inp->inp_pcbinfo->ipi_lock);
1682 socket_lock(inp->inp_socket, 0);
1683 }
1684 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
1685 inp->in6p_laddr = addr6;
1686 inp->in6p_last_outifp = outif; /* no reference needed */
1687 inp->inp_lifscope = lifscope;
1688 in6_verify_ifscope(&inp->in6p_laddr, inp->inp_lifscope);
1689 #if SKYWALK
1690 if (NETNS_TOKEN_VALID(&inp->inp_netns_token)) {
1691 netns_set_ifnet(&inp->inp_netns_token, inp->in6p_last_outifp);
1692 }
1693 #endif /* SKYWALK */
1694 inp->in6p_flags |= INP_IN6ADDR_ANY;
1695 }
1696 inp->in6p_faddr = sin6->sin6_addr;
1697 inp->inp_fport = sin6->sin6_port;
1698 inp->inp_fifscope = sin6->sin6_scope_id;
1699 in6_verify_ifscope(&inp->in6p_faddr, inp->inp_fifscope);
1700 if ((sin6->sin6_flowinfo & IPV6_FLOWINFO_MASK) != 0) {
1701 inp->inp_flow = sin6->sin6_flowinfo;
1702 }
1703 in_pcbrehash(inp);
1704 lck_rw_done(&inp->inp_pcbinfo->ipi_lock);
1705
1706 if (inp->inp_flowhash == 0) {
1707 inp_calc_flowhash(inp);
1708 ASSERT(inp->inp_flowhash != 0);
1709 }
1710 /* update flowinfo - RFC 6437 */
1711 if (inp->inp_flow == 0 && inp->in6p_flags & IN6P_AUTOFLOWLABEL) {
1712 inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
1713 inp->inp_flow |=
1714 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
1715 }
1716
1717 tcp_set_max_rwinscale(tp, so);
1718
1719 soisconnecting(so);
1720 tcpstat.tcps_connattempt++;
1721 TCP_LOG_STATE(tp, TCPS_SYN_SENT);
1722 tp->t_state = TCPS_SYN_SENT;
1723 tp->t_timer[TCPT_KEEP] = OFFSET_FROM_START(tp,
1724 TCP_CONN_KEEPINIT(tp));
1725 tp->iss = tcp_new_isn(tp);
1726 tcp_sendseqinit(tp);
1727 tp->t_connect_time = tcp_now;
1728 if (nstat_collect) {
1729 nstat_pcb_event(inp, NSTAT_EVENT_SRC_FLOW_STATE_OUTBOUND);
1730 nstat_route_connect_attempt(inp->inp_route.ro_rt);
1731 }
1732
1733 tcp_add_fsw_flow(tp, outif);
1734
1735 done:
1736 if (outif != NULL) {
1737 ifnet_release(outif);
1738 }
1739
1740 return error;
1741 }
1742
1743 /*
1744 * Export TCP internal state information via a struct tcp_info
1745 */
1746 void
tcp_fill_info(struct tcpcb * tp,struct tcp_info * ti)1747 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti)
1748 {
1749 struct inpcb *inp = tp->t_inpcb;
1750
1751 bzero(ti, sizeof(*ti));
1752
1753 ti->tcpi_state = (uint8_t)tp->t_state;
1754 ti->tcpi_flowhash = inp != NULL ? inp->inp_flowhash: 0;
1755
1756 if (TSTMP_SUPPORTED(tp)) {
1757 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS;
1758 }
1759 if (SACK_ENABLED(tp)) {
1760 ti->tcpi_options |= TCPI_OPT_SACK;
1761 }
1762 if (TCP_WINDOW_SCALE_ENABLED(tp)) {
1763 ti->tcpi_options |= TCPI_OPT_WSCALE;
1764 ti->tcpi_snd_wscale = tp->snd_scale;
1765 ti->tcpi_rcv_wscale = tp->rcv_scale;
1766 }
1767 if (TCP_ECN_ENABLED(tp)) {
1768 ti->tcpi_options |= TCPI_OPT_ECN;
1769 }
1770
1771 /* Are we in retranmission episode */
1772 if (IN_FASTRECOVERY(tp) || tp->t_rxtshift > 0) {
1773 ti->tcpi_flags |= TCPI_FLAG_LOSSRECOVERY;
1774 }
1775
1776 if (tp->t_flags & TF_STREAMING_ON) {
1777 ti->tcpi_flags |= TCPI_FLAG_STREAMING_ON;
1778 }
1779
1780 ti->tcpi_rto = tp->t_timer[TCPT_REXMT] ? tp->t_rxtcur : 0;
1781 ti->tcpi_snd_mss = tp->t_maxseg;
1782 ti->tcpi_rcv_mss = tp->t_maxseg;
1783
1784 ti->tcpi_rttcur = tp->t_rttcur;
1785 ti->tcpi_srtt = tp->t_srtt >> TCP_RTT_SHIFT;
1786 ti->tcpi_rcv_srtt = tp->rcv_srtt >> TCP_RTT_SHIFT;
1787 ti->tcpi_rttvar = tp->t_rttvar >> TCP_RTTVAR_SHIFT;
1788 ti->tcpi_rttbest = tp->t_rttbest >> TCP_RTT_SHIFT;
1789
1790 ti->tcpi_snd_ssthresh = tp->snd_ssthresh;
1791 ti->tcpi_snd_cwnd = tp->snd_cwnd;
1792 if (inp != NULL && inp->inp_socket != NULL) {
1793 ti->tcpi_snd_sbbytes = inp->inp_socket->so_snd.sb_cc;
1794 }
1795
1796 ti->tcpi_rcv_space = tp->rcv_adv > tp->rcv_nxt ?
1797 tp->rcv_adv - tp->rcv_nxt : 0;
1798
1799 ti->tcpi_snd_wnd = tp->snd_wnd;
1800 ti->tcpi_snd_nxt = tp->snd_nxt;
1801 ti->tcpi_rcv_nxt = tp->rcv_nxt;
1802
1803 /* convert bytes/msec to bits/sec */
1804 if ((tp->t_flagsext & TF_MEASURESNDBW) != 0 &&
1805 tp->t_bwmeas != NULL) {
1806 ti->tcpi_snd_bw = (tp->t_bwmeas->bw_sndbw * 8000);
1807 }
1808
1809 ti->tcpi_txpackets = inp != NULL ? inp->inp_stat->txpackets : 0;
1810 ti->tcpi_txbytes = inp != NULL ? inp->inp_stat->txbytes : 0;
1811 ti->tcpi_txretransmitbytes = tp->t_stat.txretransmitbytes;
1812 ti->tcpi_txretransmitpackets = tp->t_stat.rxmitpkts;
1813 ti->tcpi_txunacked = tp->snd_max - tp->snd_una;
1814
1815 ti->tcpi_rxpackets = inp != NULL ? inp->inp_stat->rxpackets : 0;
1816 ti->tcpi_rxbytes = inp != NULL ? inp->inp_stat->rxbytes : 0;
1817 ti->tcpi_rxduplicatebytes = tp->t_stat.rxduplicatebytes;
1818 ti->tcpi_rxoutoforderbytes = tp->t_stat.rxoutoforderbytes;
1819
1820 if (tp->t_state > TCPS_LISTEN) {
1821 ti->tcpi_synrexmits = (uint8_t)tp->t_stat.rxmitsyns;
1822 }
1823 if (inp != NULL) {
1824 ti->tcpi_cell_rxpackets = inp->inp_cstat->rxpackets;
1825 ti->tcpi_cell_rxbytes = inp->inp_cstat->rxbytes;
1826 ti->tcpi_cell_txpackets = inp->inp_cstat->txpackets;
1827 ti->tcpi_cell_txbytes = inp->inp_cstat->txbytes;
1828
1829 ti->tcpi_wifi_rxpackets = inp->inp_wstat->rxpackets;
1830 ti->tcpi_wifi_rxbytes = inp->inp_wstat->rxbytes;
1831 ti->tcpi_wifi_txpackets = inp->inp_wstat->txpackets;
1832 ti->tcpi_wifi_txbytes = inp->inp_wstat->txbytes;
1833
1834 ti->tcpi_wired_rxpackets = inp->inp_Wstat->rxpackets;
1835 ti->tcpi_wired_rxbytes = inp->inp_Wstat->rxbytes;
1836 ti->tcpi_wired_txpackets = inp->inp_Wstat->txpackets;
1837 ti->tcpi_wired_txbytes = inp->inp_Wstat->txbytes;
1838 }
1839 tcp_get_connectivity_status(tp, &ti->tcpi_connstatus);
1840
1841 ti->tcpi_tfo_syn_data_rcv = !!(tp->t_tfo_stats & TFO_S_SYNDATA_RCV);
1842 ti->tcpi_tfo_cookie_req_rcv = !!(tp->t_tfo_stats & TFO_S_COOKIEREQ_RECV);
1843 ti->tcpi_tfo_cookie_sent = !!(tp->t_tfo_stats & TFO_S_COOKIE_SENT);
1844 ti->tcpi_tfo_cookie_invalid = !!(tp->t_tfo_stats & TFO_S_COOKIE_INVALID);
1845
1846 ti->tcpi_tfo_cookie_req = !!(tp->t_tfo_stats & TFO_S_COOKIE_REQ);
1847 ti->tcpi_tfo_cookie_rcv = !!(tp->t_tfo_stats & TFO_S_COOKIE_RCV);
1848 ti->tcpi_tfo_syn_data_sent = !!(tp->t_tfo_stats & TFO_S_SYN_DATA_SENT);
1849 ti->tcpi_tfo_syn_data_acked = !!(tp->t_tfo_stats & TFO_S_SYN_DATA_ACKED);
1850 ti->tcpi_tfo_syn_loss = !!(tp->t_tfo_stats & TFO_S_SYN_LOSS);
1851 ti->tcpi_tfo_cookie_wrong = !!(tp->t_tfo_stats & TFO_S_COOKIE_WRONG);
1852 ti->tcpi_tfo_no_cookie_rcv = !!(tp->t_tfo_stats & TFO_S_NO_COOKIE_RCV);
1853 ti->tcpi_tfo_heuristics_disable = !!(tp->t_tfo_stats & TFO_S_HEURISTICS_DISABLE);
1854 ti->tcpi_tfo_send_blackhole = !!(tp->t_tfo_stats & TFO_S_SEND_BLACKHOLE);
1855 ti->tcpi_tfo_recv_blackhole = !!(tp->t_tfo_stats & TFO_S_RECV_BLACKHOLE);
1856 ti->tcpi_tfo_onebyte_proxy = !!(tp->t_tfo_stats & TFO_S_ONE_BYTE_PROXY);
1857
1858 ti->tcpi_ecn_client_setup = !!(tp->ecn_flags & (TE_SETUPSENT | TE_ACE_SETUPSENT));
1859 ti->tcpi_ecn_server_setup = !!(tp->ecn_flags & (TE_SETUPRECEIVED | TE_ACE_SETUPRECEIVED));
1860 ti->tcpi_ecn_success = (TCP_ECN_ENABLED(tp) || TCP_ACC_ECN_ON(tp)) ? 1 : 0;
1861 ti->tcpi_ecn_lost_syn = !!(tp->ecn_flags & TE_LOST_SYN);
1862 ti->tcpi_ecn_lost_synack = !!(tp->ecn_flags & TE_LOST_SYNACK);
1863
1864 ti->tcpi_local_peer = !!(tp->t_flags & TF_LOCAL);
1865
1866 if (inp != NULL && inp->inp_last_outifp != NULL) {
1867 ti->tcpi_last_outif = inp->inp_last_outifp->if_index;
1868
1869 if (IFNET_IS_CELLULAR(inp->inp_last_outifp)) {
1870 ti->tcpi_if_cell = 1;
1871 }
1872 if (IFNET_IS_WIFI(inp->inp_last_outifp)) {
1873 ti->tcpi_if_wifi = 1;
1874 }
1875 if (IFNET_IS_WIRED(inp->inp_last_outifp)) {
1876 ti->tcpi_if_wired = 1;
1877 }
1878 if (IFNET_IS_WIFI_INFRA(inp->inp_last_outifp)) {
1879 ti->tcpi_if_wifi_infra = 1;
1880 }
1881 if (inp->inp_last_outifp->if_eflags & IFEF_AWDL) {
1882 ti->tcpi_if_wifi_awdl = 1;
1883 }
1884 }
1885 if (tp->tcp_cc_index == TCP_CC_ALGO_BACKGROUND_INDEX) {
1886 ti->tcpi_snd_background = 1;
1887 }
1888 if (tcp_recv_bg == 1 || (inp != NULL && inp->inp_socket != NULL &&
1889 IS_TCP_RECV_BG(inp->inp_socket))) {
1890 ti->tcpi_rcv_background = 1;
1891 }
1892
1893 ti->tcpi_ecn_recv_ce = tp->t_ecn_recv_ce;
1894 ti->tcpi_ecn_recv_cwr = tp->t_ecn_recv_cwr;
1895
1896 ti->tcpi_rcvoopack = tp->t_rcvoopack;
1897 ti->tcpi_pawsdrop = tp->t_pawsdrop;
1898 ti->tcpi_sack_recovery_episode = tp->t_sack_recovery_episode;
1899 ti->tcpi_reordered_pkts = tp->t_reordered_pkts;
1900 ti->tcpi_dsack_sent = tp->t_dsack_sent;
1901 ti->tcpi_dsack_recvd = tp->t_dsack_recvd;
1902
1903 ti->tcpi_client_accecn_state = tp->t_client_accecn_state;
1904 ti->tcpi_server_accecn_state = tp->t_server_accecn_state;
1905 ti->tcpi_ecn_capable_packets_sent = tp->t_ecn_capable_packets_sent;
1906 ti->tcpi_ecn_capable_packets_acked = tp->t_ecn_capable_packets_acked;
1907 ti->tcpi_ecn_capable_packets_marked = tp->t_ecn_capable_packets_marked;
1908 ti->tcpi_ecn_capable_packets_lost = tp->t_ecn_capable_packets_lost;
1909 }
1910
1911 __private_extern__ errno_t
tcp_fill_info_for_info_tuple(struct info_tuple * itpl,struct tcp_info * ti)1912 tcp_fill_info_for_info_tuple(struct info_tuple *itpl, struct tcp_info *ti)
1913 {
1914 struct inpcbinfo *pcbinfo = NULL;
1915 struct inpcb *inp = NULL;
1916 struct socket *so;
1917 struct tcpcb *tp;
1918
1919 if (itpl->itpl_proto == IPPROTO_TCP) {
1920 pcbinfo = &tcbinfo;
1921 } else {
1922 return EINVAL;
1923 }
1924
1925 if (itpl->itpl_local_sa.sa_family == AF_INET &&
1926 itpl->itpl_remote_sa.sa_family == AF_INET) {
1927 inp = in_pcblookup_hash(pcbinfo,
1928 itpl->itpl_remote_sin.sin_addr,
1929 itpl->itpl_remote_sin.sin_port,
1930 itpl->itpl_local_sin.sin_addr,
1931 itpl->itpl_local_sin.sin_port,
1932 0, NULL);
1933 } else if (itpl->itpl_local_sa.sa_family == AF_INET6 &&
1934 itpl->itpl_remote_sa.sa_family == AF_INET6) {
1935 struct in6_addr ina6_local;
1936 struct in6_addr ina6_remote;
1937
1938 ina6_local = itpl->itpl_local_sin6.sin6_addr;
1939 if (in6_embedded_scope && IN6_IS_SCOPE_LINKLOCAL(&ina6_local) &&
1940 itpl->itpl_local_sin6.sin6_scope_id) {
1941 ina6_local.s6_addr16[1] = htons((uint16_t)itpl->itpl_local_sin6.sin6_scope_id);
1942 }
1943
1944 ina6_remote = itpl->itpl_remote_sin6.sin6_addr;
1945 if (in6_embedded_scope && IN6_IS_SCOPE_LINKLOCAL(&ina6_remote) &&
1946 itpl->itpl_remote_sin6.sin6_scope_id) {
1947 ina6_remote.s6_addr16[1] = htons((uint16_t)itpl->itpl_remote_sin6.sin6_scope_id);
1948 }
1949
1950 inp = in6_pcblookup_hash(pcbinfo,
1951 &ina6_remote,
1952 itpl->itpl_remote_sin6.sin6_port,
1953 itpl->itpl_remote_sin6.sin6_scope_id,
1954 &ina6_local,
1955 itpl->itpl_local_sin6.sin6_port,
1956 itpl->itpl_local_sin6.sin6_scope_id,
1957 0, NULL);
1958 } else {
1959 return EINVAL;
1960 }
1961
1962 if (inp != NULL) {
1963 if ((so = inp->inp_socket) == NULL) {
1964 return ENOENT;
1965 }
1966 socket_lock(so, 0);
1967 if (in_pcb_checkstate(inp, WNT_RELEASE, 1) == WNT_STOPUSING) {
1968 socket_unlock(so, 0);
1969 return ENOENT;
1970 }
1971 tp = intotcpcb(inp);
1972
1973 tcp_fill_info(tp, ti);
1974 socket_unlock(so, 0);
1975
1976 return 0;
1977 }
1978 #if SKYWALK
1979 else {
1980 /* if no pcb found, check for flowswitch for uTCP flow */
1981 int error;
1982 struct nexus_mib_filter nmf = {
1983 .nmf_type = NXMIB_FLOW,
1984 .nmf_bitmap = NXMIB_FILTER_INFO_TUPLE,
1985 .nmf_info_tuple = *itpl,
1986 };
1987 struct sk_stats_flow sf;
1988 size_t len = sizeof(sf);
1989 error = kernel_sysctlbyname(SK_STATS_FLOW, &sf, &len, &nmf, sizeof(nmf));
1990 if (error != 0) {
1991 printf("kernel_sysctlbyname err %d\n", error);
1992 return error;
1993 }
1994 if (len != sizeof(sf)) {
1995 printf("kernel_sysctlbyname invalid len %zu\n", len);
1996 return ENOENT;
1997 }
1998
1999 /*
2000 * This is what flow tracker can offer right now, which is good
2001 * for mDNS TCP keep alive offload.
2002 */
2003 ti->tcpi_snd_nxt = sf.sf_lseq;
2004 ti->tcpi_rcv_nxt = sf.sf_rseq;
2005 ti->tcpi_rcv_space = (uint32_t)(sf.sf_lmax_win << sf.sf_lwscale);
2006 ti->tcpi_rcv_wscale = sf.sf_lwscale;
2007 ti->tcpi_last_outif = (int32_t)sf.sf_if_index;
2008
2009 return 0;
2010 }
2011 #endif /* SKYWALK */
2012
2013 return ENOENT;
2014 }
2015
2016 static void
tcp_connection_fill_info(struct tcpcb * tp,struct tcp_connection_info * tci)2017 tcp_connection_fill_info(struct tcpcb *tp, struct tcp_connection_info *tci)
2018 {
2019 struct inpcb *inp = tp->t_inpcb;
2020
2021 bzero(tci, sizeof(*tci));
2022 tci->tcpi_state = (uint8_t)tp->t_state;
2023
2024 if (TSTMP_SUPPORTED(tp)) {
2025 tci->tcpi_options |= TCPCI_OPT_TIMESTAMPS;
2026 }
2027 if (SACK_ENABLED(tp)) {
2028 tci->tcpi_options |= TCPCI_OPT_SACK;
2029 }
2030 if (TCP_WINDOW_SCALE_ENABLED(tp)) {
2031 tci->tcpi_options |= TCPCI_OPT_WSCALE;
2032 tci->tcpi_snd_wscale = tp->snd_scale;
2033 tci->tcpi_rcv_wscale = tp->rcv_scale;
2034 }
2035 if (TCP_ECN_ENABLED(tp)) {
2036 tci->tcpi_options |= TCPCI_OPT_ECN;
2037 }
2038 if (IN_FASTRECOVERY(tp) || tp->t_rxtshift > 0) {
2039 tci->tcpi_flags |= TCPCI_FLAG_LOSSRECOVERY;
2040 }
2041 if (tp->t_flagsext & TF_PKTS_REORDERED) {
2042 tci->tcpi_flags |= TCPCI_FLAG_REORDERING_DETECTED;
2043 }
2044 tci->tcpi_rto = tp->t_timer[TCPT_REXMT] > 0 ? tp->t_rxtcur : 0;
2045 tci->tcpi_maxseg = tp->t_maxseg;
2046 tci->tcpi_snd_ssthresh = tp->snd_ssthresh;
2047 tci->tcpi_snd_cwnd = tp->snd_cwnd;
2048 tci->tcpi_snd_wnd = tp->snd_wnd;
2049 if (inp != NULL && inp->inp_socket != NULL) {
2050 tci->tcpi_snd_sbbytes = inp->inp_socket->so_snd.sb_cc;
2051 }
2052 tci->tcpi_rcv_wnd = tp->rcv_adv > tp->rcv_nxt ? tp->rcv_adv - tp->rcv_nxt : 0;
2053 tci->tcpi_rttcur = tp->t_rttcur;
2054 tci->tcpi_srtt = (tp->t_srtt >> TCP_RTT_SHIFT);
2055 tci->tcpi_rttvar = (tp->t_rttvar >> TCP_RTTVAR_SHIFT);
2056 tci->tcpi_txpackets = inp != NULL ? inp->inp_stat->txpackets : 0;
2057 tci->tcpi_txbytes = inp != NULL ? inp->inp_stat->txbytes : 0;
2058 tci->tcpi_txretransmitbytes = tp->t_stat.txretransmitbytes;
2059 tci->tcpi_txretransmitpackets = tp->t_stat.rxmitpkts;
2060 tci->tcpi_rxpackets = inp != NULL ? inp->inp_stat->rxpackets : 0;
2061 tci->tcpi_rxbytes = inp != NULL ? inp->inp_stat->rxbytes : 0;
2062 tci->tcpi_rxoutoforderbytes = tp->t_stat.rxoutoforderbytes;
2063
2064 tci->tcpi_tfo_syn_data_rcv = !!(tp->t_tfo_stats & TFO_S_SYNDATA_RCV);
2065 tci->tcpi_tfo_cookie_req_rcv = !!(tp->t_tfo_stats & TFO_S_COOKIEREQ_RECV);
2066 tci->tcpi_tfo_cookie_sent = !!(tp->t_tfo_stats & TFO_S_COOKIE_SENT);
2067 tci->tcpi_tfo_cookie_invalid = !!(tp->t_tfo_stats & TFO_S_COOKIE_INVALID);
2068 tci->tcpi_tfo_cookie_req = !!(tp->t_tfo_stats & TFO_S_COOKIE_REQ);
2069 tci->tcpi_tfo_cookie_rcv = !!(tp->t_tfo_stats & TFO_S_COOKIE_RCV);
2070 tci->tcpi_tfo_syn_data_sent = !!(tp->t_tfo_stats & TFO_S_SYN_DATA_SENT);
2071 tci->tcpi_tfo_syn_data_acked = !!(tp->t_tfo_stats & TFO_S_SYN_DATA_ACKED);
2072 tci->tcpi_tfo_syn_loss = !!(tp->t_tfo_stats & TFO_S_SYN_LOSS);
2073 tci->tcpi_tfo_cookie_wrong = !!(tp->t_tfo_stats & TFO_S_COOKIE_WRONG);
2074 tci->tcpi_tfo_no_cookie_rcv = !!(tp->t_tfo_stats & TFO_S_NO_COOKIE_RCV);
2075 tci->tcpi_tfo_heuristics_disable = !!(tp->t_tfo_stats & TFO_S_HEURISTICS_DISABLE);
2076 tci->tcpi_tfo_send_blackhole = !!(tp->t_tfo_stats & TFO_S_SEND_BLACKHOLE);
2077 tci->tcpi_tfo_recv_blackhole = !!(tp->t_tfo_stats & TFO_S_RECV_BLACKHOLE);
2078 tci->tcpi_tfo_onebyte_proxy = !!(tp->t_tfo_stats & TFO_S_ONE_BYTE_PROXY);
2079 }
2080
2081
2082 __private_extern__ int
tcp_sysctl_info(__unused struct sysctl_oid * oidp,__unused void * arg1,__unused int arg2,struct sysctl_req * req)2083 tcp_sysctl_info(__unused struct sysctl_oid *oidp, __unused void *arg1, __unused int arg2, struct sysctl_req *req)
2084 {
2085 int error;
2086 struct tcp_info ti = {};
2087 struct info_tuple itpl;
2088
2089 if (req->newptr == USER_ADDR_NULL) {
2090 return EINVAL;
2091 }
2092 if (req->newlen < sizeof(struct info_tuple)) {
2093 return EINVAL;
2094 }
2095 error = SYSCTL_IN(req, &itpl, sizeof(struct info_tuple));
2096 if (error != 0) {
2097 return error;
2098 }
2099 error = tcp_fill_info_for_info_tuple(&itpl, &ti);
2100 if (error != 0) {
2101 return error;
2102 }
2103 error = SYSCTL_OUT(req, &ti, sizeof(struct tcp_info));
2104 if (error != 0) {
2105 return error;
2106 }
2107
2108 return 0;
2109 }
2110
2111 static int
tcp_lookup_peer_pid_locked(struct socket * so,pid_t * out_pid)2112 tcp_lookup_peer_pid_locked(struct socket *so, pid_t *out_pid)
2113 {
2114 int error = EHOSTUNREACH;
2115 *out_pid = -1;
2116 if ((so->so_state & SS_ISCONNECTED) == 0) {
2117 return ENOTCONN;
2118 }
2119
2120 struct inpcb *inp = (struct inpcb*)so->so_pcb;
2121 uint16_t lport = inp->inp_lport;
2122 uint16_t fport = inp->inp_fport;
2123 uint32_t fifscope = inp->inp_fifscope;
2124 uint32_t lifscope = inp->inp_lifscope;
2125
2126 struct inpcb *finp = NULL;
2127 struct in6_addr laddr6, faddr6;
2128 struct in_addr laddr4, faddr4;
2129
2130 if (inp->inp_vflag & INP_IPV6) {
2131 laddr6 = inp->in6p_laddr;
2132 faddr6 = inp->in6p_faddr;
2133 } else if (inp->inp_vflag & INP_IPV4) {
2134 laddr4 = inp->inp_laddr;
2135 faddr4 = inp->inp_faddr;
2136 }
2137
2138 socket_unlock(so, 0);
2139 if (inp->inp_vflag & INP_IPV6) {
2140 finp = in6_pcblookup_hash(&tcbinfo, &laddr6, lport, lifscope, &faddr6, fport, fifscope, 0, NULL);
2141 } else if (inp->inp_vflag & INP_IPV4) {
2142 finp = in_pcblookup_hash(&tcbinfo, laddr4, lport, faddr4, fport, 0, NULL);
2143 }
2144
2145 if (finp) {
2146 *out_pid = finp->inp_socket->last_pid;
2147 error = 0;
2148 in_pcb_checkstate(finp, WNT_RELEASE, 0);
2149 }
2150 socket_lock(so, 0);
2151
2152 return error;
2153 }
2154
2155 void
tcp_getconninfo(struct socket * so,struct conninfo_tcp * tcp_ci)2156 tcp_getconninfo(struct socket *so, struct conninfo_tcp *tcp_ci)
2157 {
2158 tcp_fill_info(sototcpcb(so), &tcp_ci->tcpci_tcp_info);
2159 }
2160
2161 void
tcp_clear_keep_alive_offload(struct socket * so)2162 tcp_clear_keep_alive_offload(struct socket *so)
2163 {
2164 struct inpcb *inp;
2165 struct ifnet *ifp;
2166
2167 inp = sotoinpcb(so);
2168 if (inp == NULL) {
2169 return;
2170 }
2171
2172 if ((inp->inp_flags2 & INP2_KEEPALIVE_OFFLOAD) == 0) {
2173 return;
2174 }
2175
2176 ifp = inp->inp_boundifp != NULL ? inp->inp_boundifp :
2177 inp->inp_last_outifp;
2178 if (ifp == NULL) {
2179 panic("%s: so %p inp %p ifp NULL",
2180 __func__, so, inp);
2181 }
2182
2183 ifnet_lock_exclusive(ifp);
2184
2185 if (ifp->if_tcp_kao_cnt == 0) {
2186 panic("%s: so %p inp %p ifp %p if_tcp_kao_cnt == 0",
2187 __func__, so, inp, ifp);
2188 }
2189 ifp->if_tcp_kao_cnt--;
2190 inp->inp_flags2 &= ~INP2_KEEPALIVE_OFFLOAD;
2191
2192 ifnet_lock_done(ifp);
2193 }
2194
2195 static int
tcp_set_keep_alive_offload(struct socket * so,struct proc * proc)2196 tcp_set_keep_alive_offload(struct socket *so, struct proc *proc)
2197 {
2198 int error = 0;
2199 struct inpcb *inp;
2200 struct ifnet *ifp;
2201
2202 inp = sotoinpcb(so);
2203 if (inp == NULL) {
2204 return ECONNRESET;
2205 }
2206 if ((inp->inp_flags2 & INP2_KEEPALIVE_OFFLOAD) != 0) {
2207 return 0;
2208 }
2209
2210 ifp = inp->inp_boundifp != NULL ? inp->inp_boundifp :
2211 inp->inp_last_outifp;
2212 if (ifp == NULL) {
2213 error = ENXIO;
2214 os_log_info(OS_LOG_DEFAULT,
2215 "%s: error %d for proc %s[%u] out ifp is not set\n",
2216 __func__, error,
2217 proc != NULL ? proc->p_comm : "kernel",
2218 proc != NULL ? proc_getpid(proc) : 0);
2219 return ENXIO;
2220 }
2221
2222 error = if_get_tcp_kao_max(ifp);
2223 if (error != 0) {
2224 return error;
2225 }
2226
2227 ifnet_lock_exclusive(ifp);
2228 if (ifp->if_tcp_kao_cnt < ifp->if_tcp_kao_max) {
2229 ifp->if_tcp_kao_cnt++;
2230 inp->inp_flags2 |= INP2_KEEPALIVE_OFFLOAD;
2231 } else {
2232 error = ETOOMANYREFS;
2233 os_log_info(OS_LOG_DEFAULT,
2234 "%s: error %d for proc %s[%u] if_tcp_kao_max %u\n",
2235 __func__, error,
2236 proc != NULL ? proc->p_comm : "kernel",
2237 proc != NULL ? proc_getpid(proc) : 0,
2238 ifp->if_tcp_kao_max);
2239 }
2240 ifnet_lock_done(ifp);
2241
2242 return error;
2243 }
2244
2245 /*
2246 * The new sockopt interface makes it possible for us to block in the
2247 * copyin/out step (if we take a page fault). Taking a page fault at
2248 * splnet() is probably a Bad Thing. (Since sockets and pcbs both now
2249 * use TSM, there probably isn't any need for this function to run at
2250 * splnet() any more. This needs more examination.)
2251 */
2252 int
tcp_ctloutput(struct socket * so,struct sockopt * sopt)2253 tcp_ctloutput(struct socket *so, struct sockopt *sopt)
2254 {
2255 int error = 0, opt = 0, optval = 0;
2256 struct inpcb *inp;
2257 struct tcpcb *tp;
2258
2259 inp = sotoinpcb(so);
2260 if (inp == NULL) {
2261 return ECONNRESET;
2262 }
2263 /* Allow <SOL_SOCKET,SO_FLUSH/SO_TRAFFIC_MGT_BACKGROUND> at this level */
2264 if (sopt->sopt_level != IPPROTO_TCP &&
2265 !(sopt->sopt_level == SOL_SOCKET && (sopt->sopt_name == SO_FLUSH ||
2266 sopt->sopt_name == SO_TRAFFIC_MGT_BACKGROUND))) {
2267 if (SOCK_CHECK_DOM(so, PF_INET6)) {
2268 error = ip6_ctloutput(so, sopt);
2269 } else {
2270 error = ip_ctloutput(so, sopt);
2271 }
2272 return error;
2273 }
2274 tp = intotcpcb(inp);
2275 if (tp == NULL) {
2276 return ECONNRESET;
2277 }
2278
2279 calculate_tcp_clock();
2280
2281 switch (sopt->sopt_dir) {
2282 case SOPT_SET:
2283 switch (sopt->sopt_name) {
2284 case TCP_NODELAY:
2285 case TCP_NOOPT:
2286 case TCP_NOPUSH:
2287 error = sooptcopyin(sopt, &optval, sizeof optval,
2288 sizeof optval);
2289 if (error) {
2290 break;
2291 }
2292
2293 switch (sopt->sopt_name) {
2294 case TCP_NODELAY:
2295 opt = TF_NODELAY;
2296 break;
2297 case TCP_NOOPT:
2298 opt = TF_NOOPT;
2299 break;
2300 case TCP_NOPUSH:
2301 opt = TF_NOPUSH;
2302 break;
2303 default:
2304 opt = 0; /* dead code to fool gcc */
2305 break;
2306 }
2307
2308 if (optval) {
2309 tp->t_flags |= opt;
2310 } else {
2311 tp->t_flags &= ~opt;
2312 }
2313 break;
2314 case TCP_RXT_FINDROP:
2315 case TCP_NOTIMEWAIT:
2316 error = sooptcopyin(sopt, &optval, sizeof optval,
2317 sizeof optval);
2318 if (error) {
2319 break;
2320 }
2321 switch (sopt->sopt_name) {
2322 case TCP_RXT_FINDROP:
2323 opt = TF_RXTFINDROP;
2324 break;
2325 case TCP_NOTIMEWAIT:
2326 opt = TF_NOTIMEWAIT;
2327 break;
2328 default:
2329 opt = 0;
2330 break;
2331 }
2332 if (optval) {
2333 tp->t_flagsext |= opt;
2334 } else {
2335 tp->t_flagsext &= ~opt;
2336 }
2337 break;
2338 case TCP_MEASURE_SND_BW:
2339 error = sooptcopyin(sopt, &optval, sizeof optval,
2340 sizeof optval);
2341 if (error) {
2342 break;
2343 }
2344 opt = TF_MEASURESNDBW;
2345 if (optval) {
2346 if (tp->t_bwmeas == NULL) {
2347 tp->t_bwmeas = tcp_bwmeas_alloc(tp);
2348 if (tp->t_bwmeas == NULL) {
2349 error = ENOMEM;
2350 break;
2351 }
2352 }
2353 tp->t_flagsext |= opt;
2354 } else {
2355 tp->t_flagsext &= ~opt;
2356 /* Reset snd bw measurement state */
2357 tp->t_flagsext &= ~(TF_BWMEAS_INPROGRESS);
2358 if (tp->t_bwmeas != NULL) {
2359 tcp_bwmeas_free(tp);
2360 }
2361 }
2362 break;
2363 case TCP_MEASURE_BW_BURST: {
2364 struct tcp_measure_bw_burst in;
2365 uint32_t minpkts, maxpkts;
2366 bzero(&in, sizeof(in));
2367
2368 error = sooptcopyin(sopt, &in, sizeof(in),
2369 sizeof(in));
2370 if (error) {
2371 break;
2372 }
2373 if ((tp->t_flagsext & TF_MEASURESNDBW) == 0 ||
2374 tp->t_bwmeas == NULL) {
2375 error = EINVAL;
2376 break;
2377 }
2378 minpkts = (in.min_burst_size != 0) ? in.min_burst_size :
2379 tp->t_bwmeas->bw_minsizepkts;
2380 maxpkts = (in.max_burst_size != 0) ? in.max_burst_size :
2381 tp->t_bwmeas->bw_maxsizepkts;
2382 if (minpkts > maxpkts) {
2383 error = EINVAL;
2384 break;
2385 }
2386 tp->t_bwmeas->bw_minsizepkts = minpkts;
2387 tp->t_bwmeas->bw_maxsizepkts = maxpkts;
2388 tp->t_bwmeas->bw_minsize = (minpkts * tp->t_maxseg);
2389 tp->t_bwmeas->bw_maxsize = (maxpkts * tp->t_maxseg);
2390 break;
2391 }
2392 case TCP_MAXSEG:
2393 error = sooptcopyin(sopt, &optval, sizeof optval,
2394 sizeof optval);
2395 if (error) {
2396 break;
2397 }
2398
2399 if (optval > 0 && optval <= tp->t_maxseg &&
2400 optval + 40 >= tcp_minmss) {
2401 tp->t_maxseg = optval;
2402 } else {
2403 error = EINVAL;
2404 }
2405 break;
2406
2407 case TCP_KEEPALIVE:
2408 error = sooptcopyin(sopt, &optval, sizeof optval,
2409 sizeof optval);
2410 if (error) {
2411 break;
2412 }
2413 if (optval < 0 || optval > UINT32_MAX / TCP_RETRANSHZ) {
2414 error = EINVAL;
2415 } else {
2416 tp->t_keepidle = optval * TCP_RETRANSHZ;
2417 /* reset the timer to new value */
2418 if (TCPS_HAVEESTABLISHED(tp->t_state)) {
2419 tp->t_timer[TCPT_KEEP] = OFFSET_FROM_START(tp,
2420 TCP_CONN_KEEPIDLE(tp));
2421 tcp_check_timer_state(tp);
2422 }
2423 }
2424 break;
2425
2426 case TCP_CONNECTIONTIMEOUT:
2427 error = sooptcopyin(sopt, &optval, sizeof optval,
2428 sizeof optval);
2429 if (error) {
2430 break;
2431 }
2432 if (optval < 0 || optval > UINT32_MAX / TCP_RETRANSHZ) {
2433 error = EINVAL;
2434 } else {
2435 tp->t_keepinit = optval * TCP_RETRANSHZ;
2436 if (tp->t_state == TCPS_SYN_RECEIVED ||
2437 tp->t_state == TCPS_SYN_SENT) {
2438 tp->t_timer[TCPT_KEEP] = OFFSET_FROM_START(tp,
2439 TCP_CONN_KEEPINIT(tp));
2440 tcp_check_timer_state(tp);
2441 }
2442 }
2443 break;
2444
2445 case TCP_KEEPINTVL:
2446 error = sooptcopyin(sopt, &optval, sizeof(optval),
2447 sizeof(optval));
2448 if (error) {
2449 break;
2450 }
2451 if (optval < 0 || optval > UINT32_MAX / TCP_RETRANSHZ) {
2452 error = EINVAL;
2453 } else {
2454 tp->t_keepintvl = optval * TCP_RETRANSHZ;
2455 if (tp->t_state == TCPS_FIN_WAIT_2 &&
2456 TCP_CONN_MAXIDLE(tp) > 0) {
2457 tp->t_timer[TCPT_2MSL] = OFFSET_FROM_START(tp,
2458 TCP_CONN_MAXIDLE(tp));
2459 tcp_check_timer_state(tp);
2460 }
2461 }
2462 break;
2463
2464 case TCP_KEEPCNT:
2465 error = sooptcopyin(sopt, &optval, sizeof(optval),
2466 sizeof(optval));
2467 if (error) {
2468 break;
2469 }
2470 if (optval < 0 || optval > INT32_MAX) {
2471 error = EINVAL;
2472 } else {
2473 tp->t_keepcnt = optval;
2474 if (tp->t_state == TCPS_FIN_WAIT_2 &&
2475 TCP_CONN_MAXIDLE(tp) > 0) {
2476 tp->t_timer[TCPT_2MSL] = OFFSET_FROM_START(tp,
2477 TCP_CONN_MAXIDLE(tp));
2478 tcp_check_timer_state(tp);
2479 }
2480 }
2481 break;
2482
2483 case TCP_KEEPALIVE_OFFLOAD:
2484 if ((error = priv_check_cred(kauth_cred_get(),
2485 PRIV_NETINET_TCP_KA_OFFLOAD, 0)) != 0) {
2486 break;
2487 }
2488 error = sooptcopyin(sopt, &optval, sizeof(optval),
2489 sizeof(optval));
2490 if (error) {
2491 break;
2492 }
2493 if (optval < 0 || optval > INT32_MAX) {
2494 error = EINVAL;
2495 break;
2496 }
2497 if (optval != 0) {
2498 error = tcp_set_keep_alive_offload(so,
2499 sopt->sopt_p);
2500 } else {
2501 tcp_clear_keep_alive_offload(so);
2502 }
2503 break;
2504
2505 case PERSIST_TIMEOUT:
2506 error = sooptcopyin(sopt, &optval, sizeof optval,
2507 sizeof optval);
2508 if (error) {
2509 break;
2510 }
2511 if (optval < 0) {
2512 error = EINVAL;
2513 } else {
2514 tp->t_persist_timeout = optval * TCP_RETRANSHZ;
2515 }
2516 break;
2517 case TCP_RXT_CONNDROPTIME:
2518 error = sooptcopyin(sopt, &optval, sizeof(optval),
2519 sizeof(optval));
2520 if (error) {
2521 break;
2522 }
2523 if (optval < 0) {
2524 error = EINVAL;
2525 } else {
2526 tp->t_rxt_conndroptime = optval * TCP_RETRANSHZ;
2527 }
2528 break;
2529 case TCP_NOTSENT_LOWAT:
2530 error = sooptcopyin(sopt, &optval, sizeof(optval),
2531 sizeof(optval));
2532 if (error) {
2533 break;
2534 }
2535 if (optval < 0) {
2536 error = EINVAL;
2537 break;
2538 } else {
2539 if (optval == 0) {
2540 so->so_flags &= ~(SOF_NOTSENT_LOWAT);
2541 tp->t_notsent_lowat = 0;
2542 } else {
2543 so->so_flags |= SOF_NOTSENT_LOWAT;
2544 tp->t_notsent_lowat = optval;
2545 }
2546 }
2547 break;
2548 case TCP_ADAPTIVE_READ_TIMEOUT:
2549 error = sooptcopyin(sopt, &optval, sizeof(optval),
2550 sizeof(optval));
2551 if (error) {
2552 break;
2553 }
2554 if (optval < 0 ||
2555 optval > TCP_ADAPTIVE_TIMEOUT_MAX) {
2556 error = EINVAL;
2557 break;
2558 } else if (optval == 0) {
2559 tp->t_adaptive_rtimo = 0;
2560 tcp_keepalive_reset(tp);
2561
2562 if (tp->t_mpsub) {
2563 mptcp_reset_keepalive(tp);
2564 }
2565 } else {
2566 tp->t_adaptive_rtimo = (uint8_t)optval;
2567 }
2568 break;
2569 case TCP_ADAPTIVE_WRITE_TIMEOUT:
2570 error = sooptcopyin(sopt, &optval, sizeof(optval),
2571 sizeof(optval));
2572 if (error) {
2573 break;
2574 }
2575 if (optval < 0 ||
2576 optval > TCP_ADAPTIVE_TIMEOUT_MAX) {
2577 error = EINVAL;
2578 break;
2579 } else {
2580 tp->t_adaptive_wtimo = (uint8_t)optval;
2581 }
2582 break;
2583 case TCP_SENDMOREACKS:
2584 error = sooptcopyin(sopt, &optval, sizeof(optval),
2585 sizeof(optval));
2586 if (error) {
2587 break;
2588 }
2589 if (optval < 0 || optval > 1) {
2590 error = EINVAL;
2591 } else if (optval == 0) {
2592 tp->t_flagsext &= ~(TF_NOSTRETCHACK);
2593 } else {
2594 tp->t_flagsext |= TF_NOSTRETCHACK;
2595 }
2596 break;
2597 case TCP_DISABLE_BLACKHOLE_DETECTION:
2598 error = sooptcopyin(sopt, &optval, sizeof(optval),
2599 sizeof(optval));
2600 if (error) {
2601 break;
2602 }
2603 if (optval < 0 || optval > 1) {
2604 error = EINVAL;
2605 } else if (optval == 0) {
2606 tp->t_flagsext &= ~TF_NOBLACKHOLE_DETECTION;
2607 } else {
2608 tp->t_flagsext |= TF_NOBLACKHOLE_DETECTION;
2609 if ((tp->t_flags & TF_BLACKHOLE) &&
2610 tp->t_pmtud_saved_maxopd > 0) {
2611 tcp_pmtud_revert_segment_size(tp);
2612 }
2613 }
2614 break;
2615 case TCP_FASTOPEN:
2616 if (!(tcp_fastopen & TCP_FASTOPEN_SERVER)) {
2617 error = ENOTSUP;
2618 break;
2619 }
2620
2621 error = sooptcopyin(sopt, &optval, sizeof(optval),
2622 sizeof(optval));
2623 if (error) {
2624 break;
2625 }
2626 if (optval < 0 || optval > 1) {
2627 error = EINVAL;
2628 break;
2629 }
2630 if (tp->t_state != TCPS_LISTEN) {
2631 error = EINVAL;
2632 break;
2633 }
2634 if (optval) {
2635 tp->t_flagsext |= TF_FASTOPEN;
2636 } else {
2637 tcp_disable_tfo(tp);
2638 }
2639 break;
2640 case TCP_FASTOPEN_FORCE_HEURISTICS:
2641
2642 break;
2643 case TCP_FASTOPEN_FORCE_ENABLE:
2644 error = sooptcopyin(sopt, &optval, sizeof(optval),
2645 sizeof(optval));
2646
2647 if (error) {
2648 break;
2649 }
2650 if (optval < 0 || optval > 1) {
2651 error = EINVAL;
2652 break;
2653 }
2654
2655 if (tp->t_state != TCPS_CLOSED) {
2656 error = EINVAL;
2657 break;
2658 }
2659 if (optval) {
2660 tp->t_flagsext |= TF_FASTOPEN_FORCE_ENABLE;
2661 } else {
2662 tp->t_flagsext &= ~TF_FASTOPEN_FORCE_ENABLE;
2663 }
2664
2665 break;
2666 case TCP_ENABLE_ECN:
2667 error = sooptcopyin(sopt, &optval, sizeof optval,
2668 sizeof optval);
2669 if (error) {
2670 break;
2671 }
2672 if (optval) {
2673 tp->ecn_flags |= TE_ECN_MODE_ENABLE;
2674 tp->ecn_flags &= ~TE_ECN_MODE_DISABLE;
2675 } else {
2676 tp->ecn_flags &= ~TE_ECN_MODE_ENABLE;
2677 tp->ecn_flags |= TE_ECN_MODE_DISABLE;
2678 }
2679 break;
2680 case TCP_ECN_MODE:
2681 error = sooptcopyin(sopt, &optval, sizeof optval,
2682 sizeof optval);
2683 if (error) {
2684 break;
2685 }
2686 if (optval == ECN_MODE_DEFAULT) {
2687 tp->ecn_flags &= ~TE_ECN_MODE_ENABLE;
2688 tp->ecn_flags &= ~TE_ECN_MODE_DISABLE;
2689 } else if (optval == ECN_MODE_ENABLE) {
2690 tp->ecn_flags |= TE_ECN_MODE_ENABLE;
2691 tp->ecn_flags &= ~TE_ECN_MODE_DISABLE;
2692 } else if (optval == ECN_MODE_DISABLE) {
2693 tp->ecn_flags &= ~TE_ECN_MODE_ENABLE;
2694 tp->ecn_flags |= TE_ECN_MODE_DISABLE;
2695 } else {
2696 error = EINVAL;
2697 }
2698 break;
2699 case TCP_ENABLE_L4S:
2700 error = sooptcopyin(sopt, &optval, sizeof optval,
2701 sizeof optval);
2702 if (error) {
2703 break;
2704 }
2705 if (optval < 0 || optval > 1) {
2706 error = EINVAL;
2707 break;
2708 }
2709 if (tp->t_state != TCPS_CLOSED) {
2710 error = EINVAL;
2711 break;
2712 }
2713 if (optval == 1) {
2714 tp->t_flagsext |= TF_L4S_ENABLED;
2715 tp->t_flagsext &= ~TF_L4S_DISABLED;
2716 } else {
2717 tp->t_flagsext &= ~TF_L4S_ENABLED;
2718 tp->t_flagsext |= TF_L4S_DISABLED;
2719 }
2720 break;
2721 case TCP_NOTIFY_ACKNOWLEDGEMENT:
2722 error = sooptcopyin(sopt, &optval,
2723 sizeof(optval), sizeof(optval));
2724 if (error) {
2725 break;
2726 }
2727 if (optval <= 0) {
2728 error = EINVAL;
2729 break;
2730 }
2731 if (tp->t_notify_ack_count >= TCP_MAX_NOTIFY_ACK) {
2732 error = ETOOMANYREFS;
2733 break;
2734 }
2735
2736 /*
2737 * validate that the given marker id is not
2738 * a duplicate to avoid ambiguity
2739 */
2740 if ((error = tcp_notify_ack_id_valid(tp, so,
2741 optval)) != 0) {
2742 break;
2743 }
2744 error = tcp_add_notify_ack_marker(tp, optval);
2745 break;
2746 case SO_FLUSH:
2747 if ((error = sooptcopyin(sopt, &optval, sizeof(optval),
2748 sizeof(optval))) != 0) {
2749 break;
2750 }
2751
2752 error = inp_flush(inp, optval);
2753 break;
2754
2755 case SO_TRAFFIC_MGT_BACKGROUND:
2756 if ((error = sooptcopyin(sopt, &optval, sizeof(optval),
2757 sizeof(optval))) != 0) {
2758 break;
2759 }
2760
2761 if (optval) {
2762 socket_set_traffic_mgt_flags_locked(so,
2763 TRAFFIC_MGT_SO_BACKGROUND);
2764 } else {
2765 socket_clear_traffic_mgt_flags_locked(so,
2766 TRAFFIC_MGT_SO_BACKGROUND);
2767 }
2768 break;
2769 case TCP_RXT_MINIMUM_TIMEOUT:
2770 error = sooptcopyin(sopt, &optval, sizeof(optval),
2771 sizeof(optval));
2772 if (error) {
2773 break;
2774 }
2775 if (optval < 0) {
2776 error = EINVAL;
2777 break;
2778 }
2779 if (optval == 0) {
2780 tp->t_rxt_minimum_timeout = 0;
2781 } else {
2782 tp->t_rxt_minimum_timeout = min(optval,
2783 TCP_RXT_MINIMUM_TIMEOUT_LIMIT);
2784 /* convert to milliseconds */
2785 tp->t_rxt_minimum_timeout *= TCP_RETRANSHZ;
2786 }
2787 break;
2788 default:
2789 error = ENOPROTOOPT;
2790 break;
2791 }
2792 break;
2793
2794 case SOPT_GET:
2795 switch (sopt->sopt_name) {
2796 case TCP_NODELAY:
2797 optval = tp->t_flags & TF_NODELAY;
2798 break;
2799 case TCP_MAXSEG:
2800 optval = tp->t_maxseg;
2801 break;
2802 case TCP_KEEPALIVE:
2803 if (tp->t_keepidle > 0) {
2804 optval = tp->t_keepidle / TCP_RETRANSHZ;
2805 } else {
2806 optval = tcp_keepidle / TCP_RETRANSHZ;
2807 }
2808 break;
2809 case TCP_KEEPINTVL:
2810 if (tp->t_keepintvl > 0) {
2811 optval = tp->t_keepintvl / TCP_RETRANSHZ;
2812 } else {
2813 optval = tcp_keepintvl / TCP_RETRANSHZ;
2814 }
2815 break;
2816 case TCP_KEEPCNT:
2817 if (tp->t_keepcnt > 0) {
2818 optval = tp->t_keepcnt;
2819 } else {
2820 optval = tcp_keepcnt;
2821 }
2822 break;
2823 case TCP_KEEPALIVE_OFFLOAD:
2824 optval = !!(inp->inp_flags2 & INP2_KEEPALIVE_OFFLOAD);
2825 break;
2826 case TCP_NOOPT:
2827 optval = tp->t_flags & TF_NOOPT;
2828 break;
2829 case TCP_NOPUSH:
2830 optval = tp->t_flags & TF_NOPUSH;
2831 break;
2832 case TCP_ENABLE_ECN:
2833 optval = (tp->ecn_flags & TE_ECN_MODE_ENABLE) ? 1 : 0;
2834 break;
2835 case TCP_ECN_MODE:
2836 if (tp->ecn_flags & TE_ECN_MODE_ENABLE) {
2837 optval = ECN_MODE_ENABLE;
2838 } else if (tp->ecn_flags & TE_ECN_MODE_DISABLE) {
2839 optval = ECN_MODE_DISABLE;
2840 } else {
2841 optval = ECN_MODE_DEFAULT;
2842 }
2843 break;
2844 case TCP_ENABLE_L4S:
2845 optval = (tp->t_flagsext & TF_L4S_ENABLED) ? 1 : 0;
2846 break;
2847 case TCP_CONNECTIONTIMEOUT:
2848 optval = tp->t_keepinit / TCP_RETRANSHZ;
2849 break;
2850 case PERSIST_TIMEOUT:
2851 optval = tp->t_persist_timeout / TCP_RETRANSHZ;
2852 break;
2853 case TCP_RXT_CONNDROPTIME:
2854 optval = tp->t_rxt_conndroptime / TCP_RETRANSHZ;
2855 break;
2856 case TCP_RXT_FINDROP:
2857 optval = tp->t_flagsext & TF_RXTFINDROP;
2858 break;
2859 case TCP_NOTIMEWAIT:
2860 optval = (tp->t_flagsext & TF_NOTIMEWAIT) ? 1 : 0;
2861 break;
2862 case TCP_FASTOPEN:
2863 if (tp->t_state != TCPS_LISTEN ||
2864 !(tcp_fastopen & TCP_FASTOPEN_SERVER)) {
2865 error = ENOTSUP;
2866 break;
2867 }
2868 optval = tfo_enabled(tp);
2869 break;
2870 case TCP_FASTOPEN_FORCE_HEURISTICS:
2871 optval = 0;
2872 break;
2873 case TCP_FASTOPEN_FORCE_ENABLE:
2874 optval = (tp->t_flagsext & TF_FASTOPEN_FORCE_ENABLE) ? 1 : 0;
2875 break;
2876 case TCP_MEASURE_SND_BW:
2877 optval = tp->t_flagsext & TF_MEASURESNDBW;
2878 break;
2879 case TCP_INFO: {
2880 struct tcp_info ti;
2881
2882 tcp_fill_info(tp, &ti);
2883 error = sooptcopyout(sopt, &ti, sizeof(struct tcp_info));
2884 goto done;
2885 /* NOT REACHED */
2886 }
2887 case TCP_CONNECTION_INFO: {
2888 struct tcp_connection_info tci;
2889 tcp_connection_fill_info(tp, &tci);
2890 error = sooptcopyout(sopt, &tci,
2891 sizeof(struct tcp_connection_info));
2892 goto done;
2893 }
2894 case TCP_MEASURE_BW_BURST: {
2895 struct tcp_measure_bw_burst out = {};
2896 if ((tp->t_flagsext & TF_MEASURESNDBW) == 0 ||
2897 tp->t_bwmeas == NULL) {
2898 error = EINVAL;
2899 break;
2900 }
2901 out.min_burst_size = tp->t_bwmeas->bw_minsizepkts;
2902 out.max_burst_size = tp->t_bwmeas->bw_maxsizepkts;
2903 error = sooptcopyout(sopt, &out, sizeof(out));
2904 goto done;
2905 }
2906 case TCP_NOTSENT_LOWAT:
2907 if ((so->so_flags & SOF_NOTSENT_LOWAT) != 0) {
2908 optval = tp->t_notsent_lowat;
2909 } else {
2910 optval = 0;
2911 }
2912 break;
2913 case TCP_SENDMOREACKS:
2914 if (tp->t_flagsext & TF_NOSTRETCHACK) {
2915 optval = 1;
2916 } else {
2917 optval = 0;
2918 }
2919 break;
2920 case TCP_DISABLE_BLACKHOLE_DETECTION:
2921 if (tp->t_flagsext & TF_NOBLACKHOLE_DETECTION) {
2922 optval = 1;
2923 } else {
2924 optval = 0;
2925 }
2926 break;
2927 case TCP_PEER_PID: {
2928 pid_t pid;
2929 error = tcp_lookup_peer_pid_locked(so, &pid);
2930 if (error == 0) {
2931 error = sooptcopyout(sopt, &pid, sizeof(pid));
2932 }
2933 goto done;
2934 }
2935 case TCP_ADAPTIVE_READ_TIMEOUT:
2936 optval = tp->t_adaptive_rtimo;
2937 break;
2938 case TCP_ADAPTIVE_WRITE_TIMEOUT:
2939 optval = tp->t_adaptive_wtimo;
2940 break;
2941 case SO_TRAFFIC_MGT_BACKGROUND:
2942 optval = (so->so_flags1 &
2943 SOF1_TRAFFIC_MGT_SO_BACKGROUND) ? 1 : 0;
2944 break;
2945 case TCP_NOTIFY_ACKNOWLEDGEMENT: {
2946 struct tcp_notify_ack_complete retid;
2947
2948 if (sopt->sopt_valsize != sizeof(retid)) {
2949 error = EINVAL;
2950 break;
2951 }
2952 bzero(&retid, sizeof(retid));
2953 tcp_get_notify_ack_count(tp, &retid);
2954 if (retid.notify_complete_count > 0) {
2955 tcp_get_notify_ack_ids(tp, &retid);
2956 }
2957
2958 error = sooptcopyout(sopt, &retid, sizeof(retid));
2959 goto done;
2960 }
2961 case TCP_RXT_MINIMUM_TIMEOUT:
2962 optval = tp->t_rxt_minimum_timeout / TCP_RETRANSHZ;
2963 break;
2964 default:
2965 error = ENOPROTOOPT;
2966 break;
2967 }
2968 if (error == 0) {
2969 error = sooptcopyout(sopt, &optval, sizeof optval);
2970 }
2971 break;
2972 }
2973 done:
2974 return error;
2975 }
2976
2977 /*
2978 * tcp_sendspace and tcp_recvspace are the default send and receive window
2979 * sizes, respectively. These are obsolescent (this information should
2980 * be set by the route).
2981 */
2982 uint32_t tcp_sendspace = 1448 * 256;
2983 uint32_t tcp_recvspace = 1448 * 384;
2984
2985 /* During attach, the size of socket buffer allocated is limited to
2986 * sb_max in sbreserve. Disallow setting the tcp send and recv space
2987 * to be more than sb_max because that will cause tcp_attach to fail
2988 * (see radar 5713060)
2989 */
2990 static int
sysctl_tcp_sospace(struct sysctl_oid * oidp,__unused void * arg1,int arg2,struct sysctl_req * req)2991 sysctl_tcp_sospace(struct sysctl_oid *oidp, __unused void *arg1,
2992 int arg2, struct sysctl_req *req)
2993 {
2994 #pragma unused(arg2)
2995 u_int32_t new_value = 0, *space_p = NULL;
2996 int changed = 0, error = 0;
2997 u_quad_t sb_effective_max = (sb_max / (SB_MSIZE_ADJ + MCLBYTES)) * MCLBYTES;
2998
2999 switch (oidp->oid_number) {
3000 case TCPCTL_SENDSPACE:
3001 space_p = &tcp_sendspace;
3002 break;
3003 case TCPCTL_RECVSPACE:
3004 space_p = &tcp_recvspace;
3005 break;
3006 default:
3007 return EINVAL;
3008 }
3009 error = sysctl_io_number(req, *space_p, sizeof(u_int32_t),
3010 &new_value, &changed);
3011 if (changed) {
3012 if (new_value > 0 && new_value <= sb_effective_max) {
3013 *space_p = new_value;
3014 SYSCTL_SKMEM_UPDATE_AT_OFFSET(arg2, new_value);
3015 } else {
3016 error = ERANGE;
3017 }
3018 }
3019 return error;
3020 }
3021
3022 #if SYSCTL_SKMEM
3023 SYSCTL_PROC(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace,
3024 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED | CTLFLAG_KERN, &tcp_sendspace,
3025 offsetof(skmem_sysctl, tcp.sendspace), sysctl_tcp_sospace,
3026 "IU", "Maximum outgoing TCP datagram size");
3027 SYSCTL_PROC(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace,
3028 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED | CTLFLAG_KERN, &tcp_recvspace,
3029 offsetof(skmem_sysctl, tcp.recvspace), sysctl_tcp_sospace,
3030 "IU", "Maximum incoming TCP datagram size");
3031 #else /* SYSCTL_SKMEM */
3032 SYSCTL_PROC(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace,
3033 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED | CTLFLAG_KERN,
3034 &tcp_sendspace, 0, &sysctl_tcp_sospace, "IU", "Maximum outgoing TCP datagram size");
3035 SYSCTL_PROC(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace,
3036 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED | CTLFLAG_KERN,
3037 &tcp_recvspace, 0, &sysctl_tcp_sospace, "IU", "Maximum incoming TCP datagram size");
3038 #endif /* SYSCTL_SKMEM */
3039
3040 /*
3041 * Attach TCP protocol to socket, allocating
3042 * internet protocol control block, tcp control block,
3043 * bufer space, and entering LISTEN state if to accept connections.
3044 *
3045 * Returns: 0 Success
3046 * in_pcballoc:ENOBUFS
3047 * in_pcballoc:ENOMEM
3048 * in_pcballoc:??? [IPSEC specific]
3049 * soreserve:ENOBUFS
3050 */
3051 static int
tcp_attach(struct socket * so,struct proc * p)3052 tcp_attach(struct socket *so, struct proc *p)
3053 {
3054 struct tcpcb *tp;
3055 struct inpcb *inp;
3056 int error;
3057 int isipv6 = SOCK_CHECK_DOM(so, PF_INET6) != 0;
3058
3059 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
3060 error = soreserve(so, tcp_sendspace, tcp_recvspace);
3061 if (error) {
3062 return error;
3063 }
3064 }
3065
3066 error = in_pcballoc(so, &tcbinfo, p);
3067 if (error) {
3068 return error;
3069 }
3070
3071 inp = sotoinpcb(so);
3072
3073 if (so->so_snd.sb_preconn_hiwat == 0) {
3074 soreserve_preconnect(so, 2048);
3075 }
3076
3077 if ((so->so_rcv.sb_flags & SB_USRSIZE) == 0) {
3078 so->so_rcv.sb_flags |= SB_AUTOSIZE;
3079 }
3080 if ((so->so_snd.sb_flags & SB_USRSIZE) == 0) {
3081 so->so_snd.sb_flags |= SB_AUTOSIZE;
3082 }
3083
3084 if (isipv6) {
3085 inp->inp_vflag |= INP_IPV6;
3086 inp->in6p_hops = -1; /* use kernel default */
3087 } else {
3088 inp->inp_vflag |= INP_IPV4;
3089 }
3090 tp = tcp_newtcpcb(inp);
3091 if (tp == NULL) {
3092 int nofd = so->so_state & SS_NOFDREF; /* XXX */
3093
3094 so->so_state &= ~SS_NOFDREF; /* don't free the socket yet */
3095 if (isipv6) {
3096 in6_pcbdetach(inp);
3097 } else {
3098 in_pcbdetach(inp);
3099 }
3100 so->so_state |= nofd;
3101 return ENOBUFS;
3102 }
3103 if (nstat_collect) {
3104 nstat_tcp_new_pcb(inp);
3105 }
3106 TCP_LOG_STATE(tp, TCPS_CLOSED);
3107 tp->t_state = TCPS_CLOSED;
3108 return 0;
3109 }
3110
3111 /*
3112 * Initiate (or continue) disconnect.
3113 * If embryonic state, just send reset (once).
3114 * If in ``let data drain'' option and linger null, just drop.
3115 * Otherwise (hard), mark socket disconnecting and drop
3116 * current input data; switch states based on user close, and
3117 * send segment to peer (with FIN).
3118 */
3119 static struct tcpcb *
tcp_disconnect(struct tcpcb * tp)3120 tcp_disconnect(struct tcpcb *tp)
3121 {
3122 struct socket *so = tp->t_inpcb->inp_socket;
3123
3124 if (so->so_rcv.sb_cc != 0 || tp->t_reassqlen != 0 ||
3125 so->so_flags1 & SOF1_DEFUNCTINPROG) {
3126 return tcp_drop(tp, 0);
3127 }
3128
3129 if (tp->t_state < TCPS_ESTABLISHED) {
3130 tp = tcp_close(tp);
3131 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
3132 tp = tcp_drop(tp, 0);
3133 } else {
3134 soisdisconnecting(so);
3135 sbflush(&so->so_rcv);
3136 tp = tcp_usrclosed(tp);
3137 #if MPTCP
3138 /* A reset has been sent but socket exists, do not send FIN */
3139 if ((so->so_flags & SOF_MP_SUBFLOW) &&
3140 (tp) && (tp->t_mpflags & TMPF_RESET)) {
3141 return tp;
3142 }
3143 #endif
3144 if (tp) {
3145 (void) tcp_output(tp);
3146 }
3147 }
3148 return tp;
3149 }
3150
3151 /*
3152 * User issued close, and wish to trail through shutdown states:
3153 * if never received SYN, just forget it. If got a SYN from peer,
3154 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
3155 * If already got a FIN from peer, then almost done; go to LAST_ACK
3156 * state. In all other cases, have already sent FIN to peer (e.g.
3157 * after PRU_SHUTDOWN), and just have to play tedious game waiting
3158 * for peer to send FIN or not respond to keep-alives, etc.
3159 * We can let the user exit from the close as soon as the FIN is acked.
3160 */
3161 static struct tcpcb *
tcp_usrclosed(struct tcpcb * tp)3162 tcp_usrclosed(struct tcpcb *tp)
3163 {
3164 switch (tp->t_state) {
3165 case TCPS_CLOSED:
3166 case TCPS_LISTEN:
3167 case TCPS_SYN_SENT:
3168 tp = tcp_close(tp);
3169 break;
3170
3171 case TCPS_SYN_RECEIVED:
3172 tp->t_flags |= TF_NEEDFIN;
3173 break;
3174
3175 case TCPS_ESTABLISHED:
3176 DTRACE_TCP4(state__change, void, NULL,
3177 struct inpcb *, tp->t_inpcb,
3178 struct tcpcb *, tp,
3179 int32_t, TCPS_FIN_WAIT_1);
3180 TCP_LOG_STATE(tp, TCPS_FIN_WAIT_1);
3181 tp->t_state = TCPS_FIN_WAIT_1;
3182 TCP_LOG_CONNECTION_SUMMARY(tp);
3183 break;
3184
3185 case TCPS_CLOSE_WAIT:
3186 DTRACE_TCP4(state__change, void, NULL,
3187 struct inpcb *, tp->t_inpcb,
3188 struct tcpcb *, tp,
3189 int32_t, TCPS_LAST_ACK);
3190 TCP_LOG_STATE(tp, TCPS_LAST_ACK);
3191 tp->t_state = TCPS_LAST_ACK;
3192 TCP_LOG_CONNECTION_SUMMARY(tp);
3193 break;
3194 }
3195 if (tp && tp->t_state >= TCPS_FIN_WAIT_2) {
3196 soisdisconnected(tp->t_inpcb->inp_socket);
3197 /* To prevent the connection hanging in FIN_WAIT_2 forever. */
3198 if (tp->t_state == TCPS_FIN_WAIT_2) {
3199 tcp_set_finwait_timeout(tp);
3200 }
3201 }
3202 return tp;
3203 }
3204
3205 void
tcp_in_cksum_stats(u_int32_t len)3206 tcp_in_cksum_stats(u_int32_t len)
3207 {
3208 tcpstat.tcps_rcv_swcsum++;
3209 tcpstat.tcps_rcv_swcsum_bytes += len;
3210 }
3211
3212 void
tcp_out_cksum_stats(u_int32_t len)3213 tcp_out_cksum_stats(u_int32_t len)
3214 {
3215 tcpstat.tcps_snd_swcsum++;
3216 tcpstat.tcps_snd_swcsum_bytes += len;
3217 }
3218
3219 void
tcp_in6_cksum_stats(u_int32_t len)3220 tcp_in6_cksum_stats(u_int32_t len)
3221 {
3222 tcpstat.tcps_rcv6_swcsum++;
3223 tcpstat.tcps_rcv6_swcsum_bytes += len;
3224 }
3225
3226 void
tcp_out6_cksum_stats(u_int32_t len)3227 tcp_out6_cksum_stats(u_int32_t len)
3228 {
3229 tcpstat.tcps_snd6_swcsum++;
3230 tcpstat.tcps_snd6_swcsum_bytes += len;
3231 }
3232
3233 int
tcp_get_mpkl_send_info(struct mbuf * control,struct so_mpkl_send_info * mpkl_send_info)3234 tcp_get_mpkl_send_info(struct mbuf *control,
3235 struct so_mpkl_send_info *mpkl_send_info)
3236 {
3237 struct cmsghdr *cm;
3238
3239 if (control == NULL || mpkl_send_info == NULL) {
3240 return EINVAL;
3241 }
3242
3243 for (cm = M_FIRST_CMSGHDR(control); cm;
3244 cm = M_NXT_CMSGHDR(control, cm)) {
3245 if (cm->cmsg_len < sizeof(struct cmsghdr) ||
3246 cm->cmsg_len > control->m_len) {
3247 return EINVAL;
3248 }
3249 if (cm->cmsg_level != SOL_SOCKET ||
3250 cm->cmsg_type != SCM_MPKL_SEND_INFO) {
3251 continue;
3252 }
3253 if (cm->cmsg_len != CMSG_LEN(sizeof(struct so_mpkl_send_info))) {
3254 return EINVAL;
3255 }
3256 memcpy(mpkl_send_info, CMSG_DATA(cm),
3257 sizeof(struct so_mpkl_send_info));
3258 return 0;
3259 }
3260 return ENOMSG;
3261 }
3262
3263 /*
3264 * tcp socket options.
3265 *
3266 * The switch statement below does nothing at runtime, as it serves as a
3267 * compile time check to ensure that all of the tcp socket options are
3268 * unique. This works as long as this routine gets updated each time a
3269 * new tcp socket option gets added.
3270 *
3271 * Any failures at compile time indicates duplicated tcp socket option
3272 * values.
3273 */
3274 static __attribute__((unused)) void
tcpsockopt_cassert(void)3275 tcpsockopt_cassert(void)
3276 {
3277 /*
3278 * This is equivalent to _CASSERT() and the compiler wouldn't
3279 * generate any instructions, thus for compile time only.
3280 */
3281 switch ((int)0) {
3282 case 0:
3283
3284 /* bsd/netinet/tcp.h */
3285 case TCP_NODELAY:
3286 case TCP_MAXSEG:
3287 case TCP_NOPUSH:
3288 case TCP_NOOPT:
3289 case TCP_KEEPALIVE:
3290 case TCP_CONNECTIONTIMEOUT:
3291 case PERSIST_TIMEOUT:
3292 case TCP_RXT_CONNDROPTIME:
3293 case TCP_RXT_FINDROP:
3294 case TCP_KEEPINTVL:
3295 case TCP_KEEPCNT:
3296 case TCP_SENDMOREACKS:
3297 case TCP_ENABLE_ECN:
3298 case TCP_FASTOPEN:
3299 case TCP_CONNECTION_INFO:
3300 case TCP_NOTSENT_LOWAT:
3301
3302 /* bsd/netinet/tcp_private.h */
3303 case TCP_INFO:
3304 case TCP_MEASURE_SND_BW:
3305 case TCP_MEASURE_BW_BURST:
3306 case TCP_PEER_PID:
3307 case TCP_ADAPTIVE_READ_TIMEOUT:
3308 case TCP_OPTION_UNUSED_0:
3309 case TCP_ADAPTIVE_WRITE_TIMEOUT:
3310 case TCP_NOTIMEWAIT:
3311 case TCP_DISABLE_BLACKHOLE_DETECTION:
3312 case TCP_ECN_MODE:
3313 case TCP_KEEPALIVE_OFFLOAD:
3314 ;
3315 }
3316 }
3317