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 /* $FreeBSD: src/sys/netinet6/udp6_usrreq.c,v 1.6.2.6 2001/07/29 19:32:40 ume Exp $ */
30 /* $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $ */
31
32 /*
33 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
34 * All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 * 1. Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in the
43 * documentation and/or other materials provided with the distribution.
44 * 3. Neither the name of the project 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 PROJECT 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 PROJECT 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
61 /*
62 * Copyright (c) 1982, 1986, 1989, 1993
63 * The Regents of the University of California. All rights reserved.
64 *
65 * Redistribution and use in source and binary forms, with or without
66 * modification, are permitted provided that the following conditions
67 * are met:
68 * 1. Redistributions of source code must retain the above copyright
69 * notice, this list of conditions and the following disclaimer.
70 * 2. Redistributions in binary form must reproduce the above copyright
71 * notice, this list of conditions and the following disclaimer in the
72 * documentation and/or other materials provided with the distribution.
73 * 3. All advertising materials mentioning features or use of this software
74 * must display the following acknowledgement:
75 * This product includes software developed by the University of
76 * California, Berkeley and its contributors.
77 * 4. Neither the name of the University nor the names of its contributors
78 * may be used to endorse or promote products derived from this software
79 * without specific prior written permission.
80 *
81 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
82 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
83 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
84 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
85 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
86 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
87 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
88 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
89 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
90 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
91 * SUCH DAMAGE.
92 *
93 * @(#)udp_var.h 8.1 (Berkeley) 6/10/93
94 */
95 #include <sys/kernel.h>
96 #include <sys/malloc.h>
97 #include <sys/mbuf.h>
98 #include <sys/param.h>
99 #include <sys/protosw.h>
100 #include <sys/socket.h>
101 #include <sys/socketvar.h>
102 #include <sys/sysctl.h>
103 #include <sys/errno.h>
104 #include <sys/stat.h>
105 #include <sys/systm.h>
106 #include <sys/syslog.h>
107 #include <sys/proc.h>
108 #include <sys/kauth.h>
109
110 #include <net/if.h>
111 #include <net/route.h>
112 #include <net/if_types.h>
113 #include <net/ntstat.h>
114 #include <net/dlil.h>
115 #include <net/net_api_stats.h>
116
117 #include <netinet/in.h>
118 #include <netinet/in_systm.h>
119 #include <netinet/ip.h>
120 #include <netinet/in_pcb.h>
121 #include <netinet/in_var.h>
122 #include <netinet/ip_var.h>
123 #include <netinet/udp.h>
124 #include <netinet/udp_var.h>
125 #include <netinet/ip6.h>
126 #include <netinet6/ip6_var.h>
127 #include <netinet6/in6_pcb.h>
128 #include <netinet/icmp6.h>
129 #include <netinet6/udp6_var.h>
130 #include <netinet6/ip6protosw.h>
131
132 #if IPSEC
133 #include <netinet6/ipsec.h>
134 #include <netinet6/ipsec6.h>
135 #include <netinet6/esp6.h>
136 #include <netkey/key.h>
137 extern int ipsec_bypass;
138 extern int esp_udp_encap_port;
139 #endif /* IPSEC */
140
141 #if NECP
142 #include <net/necp.h>
143 #endif /* NECP */
144
145 #if FLOW_DIVERT
146 #include <netinet/flow_divert.h>
147 #endif /* FLOW_DIVERT */
148
149 #if CONTENT_FILTER
150 #include <net/content_filter.h>
151 #endif /* CONTENT_FILTER */
152
153 #if SKYWALK
154 #include <skywalk/core/skywalk_var.h>
155 #endif /* SKYWALK */
156
157 /*
158 * UDP protocol inplementation.
159 * Per RFC 768, August, 1980.
160 */
161
162 static int udp6_abort(struct socket *);
163 static int udp6_attach(struct socket *, int, struct proc *);
164 static int udp6_bind(struct socket *, struct sockaddr *, struct proc *);
165 static int udp6_connectx(struct socket *, struct sockaddr *,
166 struct sockaddr *, struct proc *, uint32_t, sae_associd_t,
167 sae_connid_t *, uint32_t, void *, uint32_t, struct uio *, user_ssize_t *);
168 static int udp6_detach(struct socket *);
169 static int udp6_disconnect(struct socket *);
170 static int udp6_disconnectx(struct socket *, sae_associd_t, sae_connid_t);
171 static int udp6_send(struct socket *, int, struct mbuf *, struct sockaddr *,
172 struct mbuf *, struct proc *);
173 static void udp6_append(struct inpcb *, struct ip6_hdr *,
174 struct sockaddr_in6 *, struct mbuf *, int, struct ifnet *);
175 static int udp6_input_checksum(struct mbuf *, struct udphdr *, int, int);
176 static int udp6_defunct(struct socket *);
177
178 struct pr_usrreqs udp6_usrreqs = {
179 .pru_abort = udp6_abort,
180 .pru_attach = udp6_attach,
181 .pru_bind = udp6_bind,
182 .pru_connect = udp6_connect,
183 .pru_connectx = udp6_connectx,
184 .pru_control = in6_control,
185 .pru_detach = udp6_detach,
186 .pru_disconnect = udp6_disconnect,
187 .pru_disconnectx = udp6_disconnectx,
188 .pru_peeraddr = in6_mapped_peeraddr,
189 .pru_send = udp6_send,
190 .pru_shutdown = udp_shutdown,
191 .pru_sockaddr = in6_mapped_sockaddr,
192 .pru_sosend = sosend,
193 .pru_soreceive = soreceive,
194 .pru_soreceive_list = soreceive_list,
195 .pru_defunct = udp6_defunct,
196 };
197
198 /*
199 * subroutine of udp6_input(), mainly for source code readability.
200 */
201 static void
udp6_append(struct inpcb * last,struct ip6_hdr * ip6,struct sockaddr_in6 * udp_in6,struct mbuf * n,int off,struct ifnet * ifp)202 udp6_append(struct inpcb *last, struct ip6_hdr *ip6,
203 struct sockaddr_in6 *udp_in6, struct mbuf *n, int off, struct ifnet *ifp)
204 {
205 #pragma unused(ip6)
206 struct mbuf *opts = NULL;
207 int ret = 0;
208 boolean_t cell = IFNET_IS_CELLULAR(ifp);
209 boolean_t wifi = (!cell && IFNET_IS_WIFI(ifp));
210 boolean_t wired = (!wifi && IFNET_IS_WIRED(ifp));
211
212 if ((last->in6p_flags & INP_CONTROLOPTS) != 0 ||
213 SOFLOW_ENABLED(last->in6p_socket) ||
214 SO_RECV_CONTROL_OPTS(last->in6p_socket)) {
215 ret = ip6_savecontrol(last, n, &opts);
216 if (ret != 0) {
217 m_freem(n);
218 m_freem(opts);
219 return;
220 }
221 }
222 m_adj(n, off);
223 if (nstat_collect) {
224 INP_ADD_STAT(last, cell, wifi, wired, rxpackets, 1);
225 INP_ADD_STAT(last, cell, wifi, wired, rxbytes, n->m_pkthdr.len);
226 inp_set_activity_bitmap(last);
227 }
228 so_recv_data_stat(last->in6p_socket, n, 0);
229 if (sbappendaddr(&last->in6p_socket->so_rcv,
230 (struct sockaddr *)udp_in6, n, opts, NULL) == 0) {
231 udpstat.udps_fullsock++;
232 } else {
233 sorwakeup(last->in6p_socket);
234 }
235 }
236
237 int
udp6_input(struct mbuf ** mp,int * offp,int proto)238 udp6_input(struct mbuf **mp, int *offp, int proto)
239 {
240 #pragma unused(proto)
241 struct mbuf *m = *mp;
242 struct ifnet *ifp;
243 struct ip6_hdr *ip6;
244 struct udphdr *uh;
245 struct inpcb *in6p;
246 struct mbuf *opts = NULL;
247 int off = *offp;
248 int plen, ulen, ret = 0;
249 boolean_t cell, wifi, wired;
250 struct sockaddr_in6 udp_in6;
251 struct inpcbinfo *pcbinfo = &udbinfo;
252 struct sockaddr_in6 fromsa;
253 u_int16_t pf_tag = 0;
254 boolean_t is_wake_pkt = false;
255
256 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), return IPPROTO_DONE);
257
258 /* Expect 32-bit aligned data pointer on strict-align platforms */
259 MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m);
260
261 ifp = m->m_pkthdr.rcvif;
262 ip6 = mtod(m, struct ip6_hdr *);
263 cell = IFNET_IS_CELLULAR(ifp);
264 wifi = (!cell && IFNET_IS_WIFI(ifp));
265 wired = (!wifi && IFNET_IS_WIRED(ifp));
266
267 if (m->m_flags & M_PKTHDR) {
268 pf_tag = m_pftag(m)->pftag_tag;
269 if (m->m_pkthdr.pkt_flags & PKTF_WAKE_PKT) {
270 is_wake_pkt = true;
271 }
272 }
273
274 udpstat.udps_ipackets++;
275
276 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
277 uh = (struct udphdr *)(void *)((caddr_t)ip6 + off);
278 ulen = ntohs((u_short)uh->uh_ulen);
279
280 if (plen != ulen) {
281 udpstat.udps_badlen++;
282 IF_UDP_STATINC(ifp, badlength);
283 goto bad;
284 }
285
286 /* destination port of 0 is illegal, based on RFC768. */
287 if (uh->uh_dport == 0) {
288 IF_UDP_STATINC(ifp, port0);
289 goto bad;
290 }
291
292 /*
293 * Checksum extended UDP header and data.
294 */
295 if (udp6_input_checksum(m, uh, off, ulen)) {
296 goto bad;
297 }
298
299 /*
300 * Construct sockaddr format source address.
301 */
302 init_sin6(&fromsa, m);
303 fromsa.sin6_port = uh->uh_sport;
304
305 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
306 int reuse_sock = 0, mcast_delivered = 0;
307 struct ip6_moptions *imo;
308
309 /*
310 * Deliver a multicast datagram to all sockets
311 * for which the local and remote addresses and ports match
312 * those of the incoming datagram. This allows more than
313 * one process to receive multicasts on the same port.
314 * (This really ought to be done for unicast datagrams as
315 * well, but that would cause problems with existing
316 * applications that open both address-specific sockets and
317 * a wildcard socket listening to the same port -- they would
318 * end up receiving duplicates of every unicast datagram.
319 * Those applications open the multiple sockets to overcome an
320 * inadequacy of the UDP socket interface, but for backwards
321 * compatibility we avoid the problem here rather than
322 * fixing the interface. Maybe 4.5BSD will remedy this?)
323 */
324
325 /*
326 * In a case that laddr should be set to the link-local
327 * address (this happens in RIPng), the multicast address
328 * specified in the received packet does not match with
329 * laddr. To cure this situation, the matching is relaxed
330 * if the receiving interface is the same as one specified
331 * in the socket and if the destination multicast address
332 * matches one of the multicast groups specified in the socket.
333 */
334
335 /*
336 * Construct sockaddr format source address.
337 */
338 init_sin6(&udp_in6, m); /* general init */
339 udp_in6.sin6_port = uh->uh_sport;
340 /*
341 * KAME note: usually we drop udphdr from mbuf here.
342 * We need udphdr for IPsec processing so we do that later.
343 */
344
345 /*
346 * Locate pcb(s) for datagram.
347 * (Algorithm copied from raw_intr().)
348 */
349 lck_rw_lock_shared(&pcbinfo->ipi_lock);
350
351 LIST_FOREACH(in6p, &udb, inp_list) {
352 #if IPSEC
353 int skipit;
354 #endif /* IPSEC */
355
356 if ((in6p->inp_vflag & INP_IPV6) == 0) {
357 continue;
358 }
359
360 if (inp_restricted_recv(in6p, ifp)) {
361 continue;
362 }
363 /*
364 * Skip unbound sockets before taking the lock on the socket as
365 * the test with the destination port in the header will fail
366 */
367 if (in6p->in6p_lport == 0) {
368 continue;
369 }
370
371 if (in_pcb_checkstate(in6p, WNT_ACQUIRE, 0) ==
372 WNT_STOPUSING) {
373 continue;
374 }
375
376 udp_lock(in6p->in6p_socket, 1, 0);
377
378 if (in_pcb_checkstate(in6p, WNT_RELEASE, 1) ==
379 WNT_STOPUSING) {
380 udp_unlock(in6p->in6p_socket, 1, 0);
381 continue;
382 }
383 if (in6p->in6p_lport != uh->uh_dport) {
384 udp_unlock(in6p->in6p_socket, 1, 0);
385 continue;
386 }
387
388 /*
389 * Handle socket delivery policy for any-source
390 * and source-specific multicast. [RFC3678]
391 */
392 imo = in6p->in6p_moptions;
393 if (imo && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
394 struct sockaddr_in6 mcaddr;
395 int blocked;
396
397 IM6O_LOCK(imo);
398 bzero(&mcaddr, sizeof(struct sockaddr_in6));
399 mcaddr.sin6_len = sizeof(struct sockaddr_in6);
400 mcaddr.sin6_family = AF_INET6;
401 mcaddr.sin6_addr = ip6->ip6_dst;
402
403 blocked = im6o_mc_filter(imo, ifp,
404 &mcaddr, &fromsa);
405 IM6O_UNLOCK(imo);
406 if (blocked != MCAST_PASS) {
407 udp_unlock(in6p->in6p_socket, 1, 0);
408 if (blocked == MCAST_NOTSMEMBER ||
409 blocked == MCAST_MUTED) {
410 udpstat.udps_filtermcast++;
411 }
412 continue;
413 }
414 }
415 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
416 (!in6_are_addr_equal_scoped(&in6p->in6p_faddr,
417 &ip6->ip6_src, in6p->inp_fifscope, ifp->if_index) ||
418 in6p->in6p_fport != uh->uh_sport)) {
419 udp_unlock(in6p->in6p_socket, 1, 0);
420 continue;
421 }
422
423 reuse_sock = in6p->inp_socket->so_options &
424 (SO_REUSEPORT | SO_REUSEADDR);
425
426 #if NECP
427 skipit = 0;
428 if (!necp_socket_is_allowed_to_send_recv_v6(in6p,
429 uh->uh_dport, uh->uh_sport, &ip6->ip6_dst,
430 &ip6->ip6_src, ifp, pf_tag, NULL, NULL, NULL, NULL)) {
431 /* do not inject data to pcb */
432 skipit = 1;
433 }
434 if (skipit == 0)
435 #endif /* NECP */
436 {
437 struct mbuf *n = NULL;
438 /*
439 * KAME NOTE: do not
440 * m_copy(m, offset, ...) below.
441 * sbappendaddr() expects M_PKTHDR,
442 * and m_copy() will copy M_PKTHDR
443 * only if offset is 0.
444 */
445 if (reuse_sock) {
446 n = m_copy(m, 0, M_COPYALL);
447 }
448 udp6_append(in6p, ip6, &udp_in6, m,
449 off + sizeof(struct udphdr), ifp);
450 mcast_delivered++;
451 m = n;
452 }
453 if (is_wake_pkt) {
454 soevent(in6p->in6p_socket,
455 SO_FILT_HINT_LOCKED | SO_FILT_HINT_WAKE_PKT);
456 }
457 udp_unlock(in6p->in6p_socket, 1, 0);
458
459 /*
460 * Don't look for additional matches if this one does
461 * not have either the SO_REUSEPORT or SO_REUSEADDR
462 * socket options set. This heuristic avoids searching
463 * through all pcbs in the common case of a non-shared
464 * port. It assumes that an application will never
465 * clear these options after setting them.
466 */
467 if (reuse_sock == 0 || m == NULL) {
468 break;
469 }
470
471 /*
472 * Expect 32-bit aligned data pointer on strict-align
473 * platforms.
474 */
475 MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m);
476
477 /*
478 * Recompute IP and UDP header pointers for new mbuf
479 */
480 ip6 = mtod(m, struct ip6_hdr *);
481 uh = (struct udphdr *)(void *)((caddr_t)ip6 + off);
482 }
483 lck_rw_done(&pcbinfo->ipi_lock);
484
485 if (mcast_delivered == 0) {
486 /*
487 * No matching pcb found; discard datagram.
488 * (No need to send an ICMP Port Unreachable
489 * for a broadcast or multicast datgram.)
490 */
491 udpstat.udps_noport++;
492 udpstat.udps_noportmcast++;
493 IF_UDP_STATINC(ifp, port_unreach);
494 goto bad;
495 }
496
497 /* free the extra copy of mbuf or skipped by NECP */
498 if (m != NULL) {
499 m_freem(m);
500 }
501 return IPPROTO_DONE;
502 }
503
504 #if IPSEC
505 /*
506 * UDP to port 4500 with a payload where the first four bytes are
507 * not zero is a UDP encapsulated IPsec packet. Packets where
508 * the payload is one byte and that byte is 0xFF are NAT keepalive
509 * packets. Decapsulate the ESP packet and carry on with IPsec input
510 * or discard the NAT keep-alive.
511 */
512 if (ipsec_bypass == 0 && (esp_udp_encap_port & 0xFFFF) != 0 &&
513 (uh->uh_dport == ntohs((u_short)esp_udp_encap_port) ||
514 uh->uh_sport == ntohs((u_short)esp_udp_encap_port))) {
515 /*
516 * Check if ESP or keepalive:
517 * 1. If the destination port of the incoming packet is 4500.
518 * 2. If the source port of the incoming packet is 4500,
519 * then check the SADB to match IP address and port.
520 */
521 bool check_esp = true;
522 if (uh->uh_dport != ntohs((u_short)esp_udp_encap_port)) {
523 check_esp = key_checksa_present(AF_INET6, (caddr_t)&ip6->ip6_dst,
524 (caddr_t)&ip6->ip6_src, uh->uh_dport,
525 uh->uh_sport, ip6_input_getdstifscope(m), ip6_input_getsrcifscope(m));
526 }
527
528 if (check_esp) {
529 int payload_len = ulen - sizeof(struct udphdr) > 4 ? 4 :
530 ulen - sizeof(struct udphdr);
531
532 if (m->m_len < off + sizeof(struct udphdr) + payload_len) {
533 if ((m = m_pullup(m, off + sizeof(struct udphdr) +
534 payload_len)) == NULL) {
535 udpstat.udps_hdrops++;
536 goto bad;
537 }
538 /*
539 * Expect 32-bit aligned data pointer on strict-align
540 * platforms.
541 */
542 MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m);
543
544 ip6 = mtod(m, struct ip6_hdr *);
545 uh = (struct udphdr *)(void *)((caddr_t)ip6 + off);
546 }
547 /* Check for NAT keepalive packet */
548 if (payload_len == 1 && *(u_int8_t*)
549 ((caddr_t)uh + sizeof(struct udphdr)) == 0xFF) {
550 goto bad;
551 } else if (payload_len == 4 && *(u_int32_t*)(void *)
552 ((caddr_t)uh + sizeof(struct udphdr)) != 0) {
553 /* UDP encapsulated IPsec packet to pass through NAT */
554 /* preserve the udp header */
555 *offp = off + sizeof(struct udphdr);
556 return esp6_input(mp, offp, IPPROTO_UDP);
557 }
558 }
559 }
560 #endif /* IPSEC */
561
562 /*
563 * Locate pcb for datagram.
564 */
565 in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport, ip6_input_getsrcifscope(m),
566 &ip6->ip6_dst, uh->uh_dport, ip6_input_getdstifscope(m), 1, m->m_pkthdr.rcvif);
567 if (in6p == NULL) {
568 IF_UDP_STATINC(ifp, port_unreach);
569
570 if (udp_log_in_vain) {
571 char buf[INET6_ADDRSTRLEN];
572
573 strlcpy(buf, ip6_sprintf(&ip6->ip6_dst), sizeof(buf));
574 if (udp_log_in_vain < 3) {
575 log(LOG_INFO, "Connection attempt to UDP "
576 "%s:%d from %s:%d\n", buf,
577 ntohs(uh->uh_dport),
578 ip6_sprintf(&ip6->ip6_src),
579 ntohs(uh->uh_sport));
580 } else if (!(m->m_flags & (M_BCAST | M_MCAST)) &&
581 !in6_are_addr_equal_scoped(&ip6->ip6_dst, &ip6->ip6_src, ip6_input_getdstifscope(m), ip6_input_getsrcifscope(m))) {
582 log(LOG_INFO, "Connection attempt "
583 "to UDP %s:%d from %s:%d\n", buf,
584 ntohs(uh->uh_dport),
585 ip6_sprintf(&ip6->ip6_src),
586 ntohs(uh->uh_sport));
587 }
588 }
589 udpstat.udps_noport++;
590 if (m->m_flags & M_MCAST) {
591 printf("UDP6: M_MCAST is set in a unicast packet.\n");
592 udpstat.udps_noportmcast++;
593 IF_UDP_STATINC(ifp, badmcast);
594 goto bad;
595 }
596 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
597 return IPPROTO_DONE;
598 }
599 #if NECP
600 if (!necp_socket_is_allowed_to_send_recv_v6(in6p, uh->uh_dport,
601 uh->uh_sport, &ip6->ip6_dst, &ip6->ip6_src, ifp, pf_tag, NULL, NULL, NULL, NULL)) {
602 in_pcb_checkstate(in6p, WNT_RELEASE, 0);
603 IF_UDP_STATINC(ifp, badipsec);
604 goto bad;
605 }
606 #endif /* NECP */
607
608 /*
609 * Construct sockaddr format source address.
610 * Stuff source address and datagram in user buffer.
611 */
612 udp_lock(in6p->in6p_socket, 1, 0);
613
614 if (in_pcb_checkstate(in6p, WNT_RELEASE, 1) == WNT_STOPUSING) {
615 udp_unlock(in6p->in6p_socket, 1, 0);
616 IF_UDP_STATINC(ifp, cleanup);
617 goto bad;
618 }
619
620 init_sin6(&udp_in6, m); /* general init */
621 udp_in6.sin6_port = uh->uh_sport;
622 if ((in6p->in6p_flags & INP_CONTROLOPTS) != 0 ||
623 SOFLOW_ENABLED(in6p->in6p_socket) ||
624 SO_RECV_CONTROL_OPTS(in6p->in6p_socket)) {
625 ret = ip6_savecontrol(in6p, m, &opts);
626 if (ret != 0) {
627 udp_unlock(in6p->in6p_socket, 1, 0);
628 goto bad;
629 }
630 }
631 m_adj(m, off + sizeof(struct udphdr));
632 if (nstat_collect) {
633 INP_ADD_STAT(in6p, cell, wifi, wired, rxpackets, 1);
634 INP_ADD_STAT(in6p, cell, wifi, wired, rxbytes, m->m_pkthdr.len);
635 inp_set_activity_bitmap(in6p);
636 }
637 so_recv_data_stat(in6p->in6p_socket, m, 0);
638 if (sbappendaddr(&in6p->in6p_socket->so_rcv,
639 (struct sockaddr *)&udp_in6, m, opts, NULL) == 0) {
640 m = NULL;
641 opts = NULL;
642 udpstat.udps_fullsock++;
643 udp_unlock(in6p->in6p_socket, 1, 0);
644 goto bad;
645 }
646 if (is_wake_pkt) {
647 soevent(in6p->in6p_socket, SO_FILT_HINT_LOCKED | SO_FILT_HINT_WAKE_PKT);
648 }
649 sorwakeup(in6p->in6p_socket);
650 udp_unlock(in6p->in6p_socket, 1, 0);
651 return IPPROTO_DONE;
652 bad:
653 if (m != NULL) {
654 m_freem(m);
655 }
656 if (opts != NULL) {
657 m_freem(opts);
658 }
659 return IPPROTO_DONE;
660 }
661
662 void
udp6_ctlinput(int cmd,struct sockaddr * sa,void * d,__unused struct ifnet * ifp)663 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d, __unused struct ifnet *ifp)
664 {
665 struct udphdr uh;
666 struct ip6_hdr *ip6;
667 struct mbuf *m;
668 int off = 0;
669 struct ip6ctlparam *ip6cp = NULL;
670 struct icmp6_hdr *icmp6 = NULL;
671 const struct sockaddr_in6 *sa6_src = NULL;
672 void *cmdarg = NULL;
673 void (*notify)(struct inpcb *, int) = udp_notify;
674 struct inpcb *in6p;
675 struct udp_portonly {
676 u_int16_t uh_sport;
677 u_int16_t uh_dport;
678 } *uhp;
679
680 if (sa->sa_family != AF_INET6 ||
681 sa->sa_len != sizeof(struct sockaddr_in6)) {
682 return;
683 }
684
685 if ((unsigned)cmd >= PRC_NCMDS) {
686 return;
687 }
688 if (PRC_IS_REDIRECT(cmd)) {
689 notify = in6_rtchange;
690 d = NULL;
691 } else if (cmd == PRC_HOSTDEAD) {
692 d = NULL;
693 } else if (inet6ctlerrmap[cmd] == 0) {
694 return;
695 }
696
697 /* if the parameter is from icmp6, decode it. */
698 if (d != NULL) {
699 ip6cp = (struct ip6ctlparam *)d;
700 icmp6 = ip6cp->ip6c_icmp6;
701 m = ip6cp->ip6c_m;
702 ip6 = ip6cp->ip6c_ip6;
703 off = ip6cp->ip6c_off;
704 cmdarg = ip6cp->ip6c_cmdarg;
705 sa6_src = ip6cp->ip6c_src;
706 } else {
707 m = NULL;
708 ip6 = NULL;
709 cmdarg = NULL;
710 sa6_src = &sa6_any;
711 }
712
713 if (ip6 != NULL) {
714 #if SKYWALK
715 union sockaddr_in_4_6 sock_laddr;
716 struct protoctl_ev_val prctl_ev_val;
717 #endif /* SKYWALK */
718 /*
719 * XXX: We assume that when IPV6 is non NULL,
720 * M and OFF are valid.
721 */
722 /* check if we can safely examine src and dst ports */
723 if (m->m_pkthdr.len < off + sizeof(*uhp)) {
724 return;
725 }
726
727 bzero(&uh, sizeof(uh));
728 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
729
730 in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_dst, uh.uh_dport, ip6_input_getdstifscope(m),
731 &ip6->ip6_src, uh.uh_sport, ip6_input_getsrcifscope(m), 0, NULL);
732 if (cmd == PRC_MSGSIZE && in6p != NULL && !uuid_is_null(in6p->necp_client_uuid)) {
733 uuid_t null_uuid;
734 uuid_clear(null_uuid);
735 necp_update_flow_protoctl_event(null_uuid, in6p->necp_client_uuid,
736 PRC_MSGSIZE, ntohl(icmp6->icmp6_mtu), 0);
737 /*
738 * Avoid setting so_error when using Network.framework
739 * since the notification of PRC_MSGSIZE has been delivered
740 * through NECP.
741 */
742 in6_pcbnotify(&udbinfo, sa, uh.uh_dport,
743 (struct sockaddr*)ip6cp->ip6c_src, uh.uh_sport,
744 cmd, cmdarg, NULL);
745 } else {
746 in6_pcbnotify(&udbinfo, sa, uh.uh_dport,
747 (struct sockaddr*)ip6cp->ip6c_src, uh.uh_sport,
748 cmd, cmdarg, notify);
749 }
750 #if SKYWALK
751 bzero(&prctl_ev_val, sizeof(prctl_ev_val));
752 bzero(&sock_laddr, sizeof(sock_laddr));
753
754 if (cmd == PRC_MSGSIZE && icmp6 != NULL) {
755 prctl_ev_val.val = ntohl(icmp6->icmp6_mtu);
756 }
757 sock_laddr.sin6.sin6_family = AF_INET6;
758 sock_laddr.sin6.sin6_len = sizeof(sock_laddr.sin6);
759 sock_laddr.sin6.sin6_addr = ip6->ip6_src;
760
761 protoctl_event_enqueue_nwk_wq_entry(ifp,
762 (struct sockaddr *)&sock_laddr, sa,
763 uh.uh_sport, uh.uh_dport, IPPROTO_UDP,
764 cmd, &prctl_ev_val);
765 #endif /* SKYWALK */
766 }
767 /*
768 * XXX The else condition here was broken for a long time.
769 * Fixing it made us deliver notification correctly but broke
770 * some frameworks that didn't handle it well.
771 * For now we have removed it and will revisit it later.
772 */
773 }
774
775 static int
udp6_abort(struct socket * so)776 udp6_abort(struct socket *so)
777 {
778 struct inpcb *inp;
779
780 inp = sotoinpcb(so);
781 if (inp == NULL) {
782 panic("%s: so=%p null inp", __func__, so);
783 /* NOTREACHED */
784 }
785 soisdisconnected(so);
786 in6_pcbdetach(inp);
787 return 0;
788 }
789
790 static int
udp6_attach(struct socket * so,int proto,struct proc * p)791 udp6_attach(struct socket *so, int proto, struct proc *p)
792 {
793 #pragma unused(proto)
794 struct inpcb *inp;
795 int error;
796
797 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
798 error = soreserve(so, udp_sendspace, udp_recvspace);
799 if (error) {
800 return error;
801 }
802 }
803
804 inp = sotoinpcb(so);
805 if (inp != NULL) {
806 return EINVAL;
807 }
808
809 error = in_pcballoc(so, &udbinfo, p);
810 if (error) {
811 return error;
812 }
813
814 inp = (struct inpcb *)so->so_pcb;
815 inp->inp_vflag |= INP_IPV6;
816 if (ip6_mapped_addr_on) {
817 inp->inp_vflag |= INP_IPV4;
818 }
819 inp->in6p_hops = -1; /* use kernel default */
820 inp->in6p_cksum = -1; /* just to be sure */
821 /*
822 * XXX: ugly!!
823 * IPv4 TTL initialization is necessary for an IPv6 socket as well,
824 * because the socket may be bound to an IPv6 wildcard address,
825 * which may match an IPv4-mapped IPv6 address.
826 */
827 inp->inp_ip_ttl = (u_char)ip_defttl;
828 if (nstat_collect) {
829 nstat_udp_new_pcb(inp);
830 }
831 return 0;
832 }
833
834 static int
udp6_bind(struct socket * so,struct sockaddr * nam,struct proc * p)835 udp6_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
836 {
837 struct inpcb *inp;
838 int error;
839
840 inp = sotoinpcb(so);
841 if (inp == NULL) {
842 return EINVAL;
843 }
844
845 const uint8_t old_flags = inp->inp_vflag;
846 inp->inp_vflag &= ~INP_IPV4;
847 inp->inp_vflag |= INP_IPV6;
848
849 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
850 struct sockaddr_in6 *sin6_p;
851
852 sin6_p = (struct sockaddr_in6 *)(void *)nam;
853
854 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
855 inp->inp_vflag |= INP_IPV4;
856 inp->inp_vflag &= ~INP_V4MAPPEDV6;
857 } else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
858 struct sockaddr_in sin;
859
860 in6_sin6_2_sin(&sin, sin6_p);
861 inp->inp_vflag |= INP_IPV4;
862 inp->inp_vflag &= ~INP_IPV6;
863 inp->inp_vflag |= INP_V4MAPPEDV6;
864
865 error = in_pcbbind(inp, (struct sockaddr *)&sin, p);
866 if (error != 0) {
867 inp->inp_vflag = old_flags;
868 }
869 return error;
870 }
871 }
872
873 error = in6_pcbbind(inp, nam, p);
874 if (error != 0) {
875 inp->inp_vflag = old_flags;
876 }
877 return error;
878 }
879
880 int
udp6_connect(struct socket * so,struct sockaddr * nam,struct proc * p)881 udp6_connect(struct socket *so, struct sockaddr *nam, struct proc *p)
882 {
883 struct inpcb *inp;
884 int error;
885 struct sockaddr_in6 *sin6_p = (struct sockaddr_in6 *)(void *)nam;
886
887 #if defined(NECP) && defined(FLOW_DIVERT)
888 int should_use_flow_divert = 0;
889 #endif /* defined(NECP) && defined(FLOW_DIVERT) */
890
891 inp = sotoinpcb(so);
892 if (inp == NULL) {
893 return EINVAL;
894 }
895
896 #if defined(NECP) && defined(FLOW_DIVERT)
897 should_use_flow_divert = necp_socket_should_use_flow_divert(inp);
898 #endif /* defined(NECP) && defined(FLOW_DIVERT) */
899
900 /*
901 * It is possible that the socket is bound to v4 mapped v6 address.
902 * Post that do not allow connect to a v6 endpoint.
903 */
904 if (inp->inp_vflag & INP_V4MAPPEDV6 &&
905 !IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
906 return EINVAL;
907 }
908
909 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
910 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
911 struct sockaddr_in sin;
912 const uint8_t old_flags = inp->inp_vflag;
913
914 if (inp->inp_faddr.s_addr != INADDR_ANY) {
915 return EISCONN;
916 }
917
918 if (!(so->so_flags1 & SOF1_CONNECT_COUNTED)) {
919 so->so_flags1 |= SOF1_CONNECT_COUNTED;
920 INC_ATOMIC_INT64_LIM(net_api_stats.nas_socket_inet_dgram_connected);
921 }
922
923 in6_sin6_2_sin(&sin, sin6_p);
924 #if defined(NECP) && defined(FLOW_DIVERT)
925 if (should_use_flow_divert) {
926 goto do_flow_divert;
927 }
928 #endif /* defined(NECP) && defined(FLOW_DIVERT) */
929 inp->inp_vflag |= INP_IPV4;
930 inp->inp_vflag &= ~INP_IPV6;
931 inp->inp_vflag |= INP_V4MAPPEDV6;
932
933 error = in_pcbconnect(inp, (struct sockaddr *)&sin,
934 p, IFSCOPE_NONE, NULL);
935 if (error == 0) {
936 #if NECP
937 /* Update NECP client with connected five-tuple */
938 if (!uuid_is_null(inp->necp_client_uuid)) {
939 socket_unlock(so, 0);
940 necp_client_assign_from_socket(so->last_pid, inp->necp_client_uuid, inp);
941 socket_lock(so, 0);
942 }
943 #endif /* NECP */
944 soisconnected(so);
945 } else {
946 inp->inp_vflag = old_flags;
947 }
948 return error;
949 }
950 }
951
952 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
953 return EISCONN;
954 }
955
956 if (!(so->so_flags1 & SOF1_CONNECT_COUNTED)) {
957 so->so_flags1 |= SOF1_CONNECT_COUNTED;
958 INC_ATOMIC_INT64_LIM(net_api_stats.nas_socket_inet6_dgram_connected);
959 }
960
961 #if defined(NECP) && defined(FLOW_DIVERT)
962 do_flow_divert:
963 if (should_use_flow_divert) {
964 error = flow_divert_pcb_init(so);
965 if (error == 0) {
966 error = flow_divert_connect_out(so, nam, p);
967 }
968 return error;
969 }
970 #endif /* defined(NECP) && defined(FLOW_DIVERT) */
971
972 error = in6_pcbconnect(inp, nam, p);
973 if (error == 0) {
974 /* should be non mapped addr */
975 if (ip6_mapped_addr_on ||
976 (inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
977 inp->inp_vflag &= ~INP_IPV4;
978 inp->inp_vflag |= INP_IPV6;
979 }
980 #if NECP
981 /* Update NECP client with connected five-tuple */
982 if (!uuid_is_null(inp->necp_client_uuid)) {
983 socket_unlock(so, 0);
984 necp_client_assign_from_socket(so->last_pid, inp->necp_client_uuid, inp);
985 socket_lock(so, 0);
986 }
987 #endif /* NECP */
988 soisconnected(so);
989 if (inp->inp_flowhash == 0) {
990 inp_calc_flowhash(inp);
991 ASSERT(inp->inp_flowhash != 0);
992 }
993 /* update flowinfo - RFC 6437 */
994 if (inp->inp_flow == 0 &&
995 inp->in6p_flags & IN6P_AUTOFLOWLABEL) {
996 inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
997 inp->inp_flow |=
998 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
999 }
1000 }
1001 return error;
1002 }
1003
1004 static int
udp6_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)1005 udp6_connectx(struct socket *so, struct sockaddr *src,
1006 struct sockaddr *dst, struct proc *p, uint32_t ifscope,
1007 sae_associd_t aid, sae_connid_t *pcid, uint32_t flags, void *arg,
1008 uint32_t arglen, struct uio *uio, user_ssize_t *bytes_written)
1009 {
1010 return udp_connectx_common(so, AF_INET6, src, dst,
1011 p, ifscope, aid, pcid, flags, arg, arglen, uio, bytes_written);
1012 }
1013
1014 static int
udp6_detach(struct socket * so)1015 udp6_detach(struct socket *so)
1016 {
1017 struct inpcb *inp;
1018
1019 inp = sotoinpcb(so);
1020 if (inp == NULL) {
1021 return EINVAL;
1022 }
1023 in6_pcbdetach(inp);
1024 return 0;
1025 }
1026
1027 static int
udp6_disconnect(struct socket * so)1028 udp6_disconnect(struct socket *so)
1029 {
1030 struct inpcb *inp;
1031
1032 inp = sotoinpcb(so);
1033 if (inp == NULL
1034 #if NECP
1035 || (necp_socket_should_use_flow_divert(inp))
1036 #endif /* NECP */
1037 ) {
1038 return inp == NULL ? EINVAL : EPROTOTYPE;
1039 }
1040
1041 if (inp->inp_vflag & INP_IPV4) {
1042 struct pr_usrreqs *pru;
1043
1044 pru = ip_protox[IPPROTO_UDP]->pr_usrreqs;
1045 return (*pru->pru_disconnect)(so);
1046 }
1047
1048 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1049 return ENOTCONN;
1050 }
1051
1052 in6_pcbdisconnect(inp);
1053
1054 /* reset flow-controlled state, just in case */
1055 inp_reset_fc_state(inp);
1056
1057 inp->in6p_laddr = in6addr_any;
1058 inp->inp_lifscope = IFSCOPE_NONE;
1059 inp->in6p_last_outifp = NULL;
1060 #if SKYWALK
1061 if (NETNS_TOKEN_VALID(&inp->inp_netns_token)) {
1062 netns_set_ifnet(&inp->inp_netns_token, NULL);
1063 }
1064 #endif /* SKYWALK */
1065
1066 so->so_state &= ~SS_ISCONNECTED; /* XXX */
1067 return 0;
1068 }
1069
1070 static int
udp6_disconnectx(struct socket * so,sae_associd_t aid,sae_connid_t cid)1071 udp6_disconnectx(struct socket *so, sae_associd_t aid, sae_connid_t cid)
1072 {
1073 #pragma unused(cid)
1074 if (aid != SAE_ASSOCID_ANY && aid != SAE_ASSOCID_ALL) {
1075 return EINVAL;
1076 }
1077
1078 return udp6_disconnect(so);
1079 }
1080
1081 static int
udp6_send(struct socket * so,int flags,struct mbuf * m,struct sockaddr * addr,struct mbuf * control,struct proc * p)1082 udp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
1083 struct mbuf *control, struct proc *p)
1084 {
1085 struct inpcb *inp;
1086 int error = 0;
1087 #if defined(NECP) && defined(FLOW_DIVERT)
1088 int should_use_flow_divert = 0;
1089 #endif /* defined(NECP) && defined(FLOW_DIVERT) */
1090 #if CONTENT_FILTER
1091 struct m_tag *cfil_tag = NULL;
1092 struct sockaddr *cfil_faddr = NULL;
1093 #endif
1094
1095 inp = sotoinpcb(so);
1096 if (inp == NULL) {
1097 error = EINVAL;
1098 goto bad;
1099 }
1100
1101 #if CONTENT_FILTER
1102 //If socket is subject to UDP Content Filter and unconnected, get addr from tag.
1103 if (CFIL_DGRAM_FILTERED(so) && !addr && IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1104 cfil_tag = cfil_dgram_get_socket_state(m, NULL, NULL, &cfil_faddr, NULL);
1105 if (cfil_tag) {
1106 addr = (struct sockaddr *)cfil_faddr;
1107 }
1108 }
1109 #endif
1110
1111 #if defined(NECP) && defined(FLOW_DIVERT)
1112 should_use_flow_divert = necp_socket_should_use_flow_divert(inp);
1113 #endif /* defined(NECP) && defined(FLOW_DIVERT) */
1114
1115 if (addr != NULL) {
1116 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
1117 error = EINVAL;
1118 goto bad;
1119 }
1120 if (addr->sa_family != AF_INET6) {
1121 error = EAFNOSUPPORT;
1122 goto bad;
1123 }
1124 }
1125
1126 if (ip6_mapped_addr_on || (inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
1127 int hasv4addr;
1128 struct sockaddr_in6 *sin6 = NULL;
1129
1130 if (addr == NULL) {
1131 hasv4addr = (inp->inp_vflag & INP_IPV4);
1132 } else {
1133 sin6 = (struct sockaddr_in6 *)(void *)addr;
1134 hasv4addr =
1135 IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) ? 1 : 0;
1136 }
1137 if (hasv4addr) {
1138 struct pr_usrreqs *pru;
1139
1140 if (sin6 != NULL) {
1141 in6_sin6_2_sin_in_sock(addr);
1142 }
1143 #if defined(NECP) && defined(FLOW_DIVERT)
1144 if (should_use_flow_divert) {
1145 goto do_flow_divert;
1146 }
1147 #endif /* defined(NECP) && defined(FLOW_DIVERT) */
1148 pru = ip_protox[IPPROTO_UDP]->pr_usrreqs;
1149 error = ((*pru->pru_send)(so, flags, m, addr,
1150 control, p));
1151 #if CONTENT_FILTER
1152 if (cfil_tag) {
1153 m_tag_free(cfil_tag);
1154 }
1155 #endif
1156 /* addr will just be freed in sendit(). */
1157 return error;
1158 }
1159 }
1160
1161 #if defined(NECP) && defined(FLOW_DIVERT)
1162 do_flow_divert:
1163 if (should_use_flow_divert) {
1164 /* Implicit connect */
1165 error = flow_divert_implicit_data_out(so, flags, m, addr, control, p);
1166 #if CONTENT_FILTER
1167 if (cfil_tag) {
1168 m_tag_free(cfil_tag);
1169 }
1170 #endif
1171 return error;
1172 }
1173 #endif /* defined(NECP) && defined(FLOW_DIVERT) */
1174
1175 #if SKYWALK
1176 sk_protect_t protect = sk_async_transmit_protect();
1177 #endif /* SKYWALK */
1178 error = udp6_output(inp, m, addr, control, p);
1179 #if SKYWALK
1180 sk_async_transmit_unprotect(protect);
1181 #endif /* SKYWALK */
1182
1183 #if CONTENT_FILTER
1184 if (cfil_tag) {
1185 m_tag_free(cfil_tag);
1186 }
1187 #endif
1188 return error;
1189
1190 bad:
1191 VERIFY(error != 0);
1192
1193 if (m != NULL) {
1194 m_freem(m);
1195 }
1196 if (control != NULL) {
1197 m_freem(control);
1198 }
1199 #if CONTENT_FILTER
1200 if (cfil_tag) {
1201 m_tag_free(cfil_tag);
1202 }
1203 #endif
1204 return error;
1205 }
1206
1207 /*
1208 * Checksum extended UDP header and data.
1209 */
1210 static int
udp6_input_checksum(struct mbuf * m,struct udphdr * uh,int off,int ulen)1211 udp6_input_checksum(struct mbuf *m, struct udphdr *uh, int off, int ulen)
1212 {
1213 struct ifnet *ifp = m->m_pkthdr.rcvif;
1214 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1215
1216 if (!(m->m_pkthdr.csum_flags & CSUM_DATA_VALID) &&
1217 uh->uh_sum == 0) {
1218 /* UDP/IPv6 checksum is mandatory (RFC2460) */
1219
1220 /*
1221 * If checksum was already validated, ignore this check.
1222 * This is necessary for transport-mode ESP, which may be
1223 * getting UDP payloads without checksums when the network
1224 * has a NAT64.
1225 */
1226 udpstat.udps_nosum++;
1227 goto badsum;
1228 }
1229
1230 if ((hwcksum_rx || (ifp->if_flags & IFF_LOOPBACK) ||
1231 (m->m_pkthdr.pkt_flags & PKTF_LOOP)) &&
1232 (m->m_pkthdr.csum_flags & CSUM_DATA_VALID)) {
1233 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
1234 uh->uh_sum = m->m_pkthdr.csum_rx_val;
1235 } else {
1236 uint32_t sum = m->m_pkthdr.csum_rx_val;
1237 uint32_t start = m->m_pkthdr.csum_rx_start;
1238 int32_t trailer = (m_pktlen(m) - (off + ulen));
1239
1240 /*
1241 * Perform 1's complement adjustment of octets
1242 * that got included/excluded in the hardware-
1243 * calculated checksum value. Also take care
1244 * of any trailing bytes and subtract out
1245 * their partial sum.
1246 */
1247 ASSERT(trailer >= 0);
1248 if ((m->m_pkthdr.csum_flags & CSUM_PARTIAL) &&
1249 (start != off || trailer != 0)) {
1250 uint32_t swbytes = (uint32_t)trailer;
1251 uint16_t s = 0, d = 0;
1252
1253 if (IN6_IS_SCOPE_EMBED(&ip6->ip6_src)) {
1254 s = ip6->ip6_src.s6_addr16[1];
1255 ip6->ip6_src.s6_addr16[1] = 0;
1256 }
1257 if (IN6_IS_SCOPE_EMBED(&ip6->ip6_dst)) {
1258 d = ip6->ip6_dst.s6_addr16[1];
1259 ip6->ip6_dst.s6_addr16[1] = 0;
1260 }
1261
1262 /* callee folds in sum */
1263 sum = m_adj_sum16(m, start, off, ulen, sum);
1264 if (off > start) {
1265 swbytes += (off - start);
1266 } else {
1267 swbytes += (start - off);
1268 }
1269
1270 if (IN6_IS_SCOPE_EMBED(&ip6->ip6_src)) {
1271 ip6->ip6_src.s6_addr16[1] = s;
1272 }
1273 if (IN6_IS_SCOPE_EMBED(&ip6->ip6_dst)) {
1274 ip6->ip6_dst.s6_addr16[1] = d;
1275 }
1276
1277 if (swbytes != 0) {
1278 udp_in_cksum_stats(swbytes);
1279 }
1280 if (trailer != 0) {
1281 m_adj(m, -trailer);
1282 }
1283 }
1284
1285 uh->uh_sum = in6_pseudo(&ip6->ip6_src, &ip6->ip6_dst,
1286 sum + htonl(ulen + IPPROTO_UDP));
1287 }
1288 uh->uh_sum ^= 0xffff;
1289 } else {
1290 udp_in6_cksum_stats(ulen);
1291 uh->uh_sum = in6_cksum(m, IPPROTO_UDP, off, ulen);
1292 }
1293
1294 if (uh->uh_sum != 0) {
1295 badsum:
1296 udpstat.udps_badsum++;
1297 IF_UDP_STATINC(ifp, badchksum);
1298 return -1;
1299 }
1300
1301 return 0;
1302 }
1303
1304 int
udp6_defunct(struct socket * so)1305 udp6_defunct(struct socket *so)
1306 {
1307 struct ip_moptions *imo;
1308 struct ip6_moptions *im6o;
1309 struct inpcb *inp;
1310
1311 inp = sotoinpcb(so);
1312 if (inp == NULL) {
1313 return EINVAL;
1314 }
1315
1316 im6o = inp->in6p_moptions;
1317 inp->in6p_moptions = NULL;
1318 if (im6o != NULL) {
1319 struct proc *p = current_proc();
1320
1321 SODEFUNCTLOG("%s[%d, %s]: defuncting so 0x%llu drop ipv6 multicast memberships",
1322 __func__, proc_pid(p), proc_best_name(p),
1323 so->so_gencnt);
1324 IM6O_REMREF(im6o);
1325 }
1326 imo = inp->inp_moptions;
1327 if (imo != NULL) {
1328 struct proc *p = current_proc();
1329
1330 SODEFUNCTLOG("%s[%d, %s]: defuncting so 0x%llu drop ipv4 multicast memberships",
1331 __func__, proc_pid(p), proc_best_name(p),
1332 so->so_gencnt);
1333
1334 inp->inp_moptions = NULL;
1335
1336 IMO_REMREF(imo);
1337 }
1338
1339 return 0;
1340 }
1341