1 /*
2 * Copyright (c) 2000-2024 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 #include <net/droptap.h>
117
118 #include <netinet/in.h>
119 #include <netinet/in_systm.h>
120 #include <netinet/ip.h>
121 #include <netinet/in_pcb.h>
122 #include <netinet/in_var.h>
123 #include <netinet/ip_var.h>
124 #include <netinet/udp.h>
125 #include <netinet/udp_var.h>
126 #include <netinet/udp_log.h>
127
128 #include <netinet/ip6.h>
129 #include <netinet6/ip6_var.h>
130 #include <netinet6/in6_pcb.h>
131 #include <netinet/icmp6.h>
132 #include <netinet6/udp6_var.h>
133 #include <netinet6/ip6protosw.h>
134
135 #if IPSEC
136 #include <netinet6/ipsec.h>
137 #include <netinet6/ipsec6.h>
138 #include <netinet6/esp6.h>
139 #include <netkey/key.h>
140 extern int ipsec_bypass;
141 extern int esp_udp_encap_port;
142 #endif /* IPSEC */
143
144 #if NECP
145 #include <net/necp.h>
146 #endif /* NECP */
147
148 #if FLOW_DIVERT
149 #include <netinet/flow_divert.h>
150 #endif /* FLOW_DIVERT */
151
152 #if CONTENT_FILTER
153 #include <net/content_filter.h>
154 #endif /* CONTENT_FILTER */
155
156 #if SKYWALK
157 #include <skywalk/core/skywalk_var.h>
158 #endif /* SKYWALK */
159
160 #include <net/sockaddr_utils.h>
161
162 /*
163 * UDP protocol inplementation.
164 * Per RFC 768, August, 1980.
165 */
166
167 static int udp6_abort(struct socket *);
168 static int udp6_attach(struct socket *, int, struct proc *);
169 static int udp6_bind(struct socket *, struct sockaddr *, struct proc *);
170 static int udp6_connectx(struct socket *, struct sockaddr *,
171 struct sockaddr *, struct proc *, uint32_t, sae_associd_t,
172 sae_connid_t *, uint32_t, void *, uint32_t, struct uio *, user_ssize_t *);
173 static int udp6_detach(struct socket *);
174 static int udp6_disconnect(struct socket *);
175 static int udp6_disconnectx(struct socket *, sae_associd_t, sae_connid_t);
176 static int udp6_send(struct socket *, int, struct mbuf *, struct sockaddr *,
177 struct mbuf *, struct proc *);
178 static void udp6_append(struct inpcb *, struct ip6_hdr *,
179 struct sockaddr_in6 *, struct mbuf *, int, struct ifnet *);
180 static int udp6_input_checksum(struct mbuf *, struct udphdr *, int, int);
181 static int udp6_defunct(struct socket *);
182
183 struct pr_usrreqs udp6_usrreqs = {
184 .pru_abort = udp6_abort,
185 .pru_attach = udp6_attach,
186 .pru_bind = udp6_bind,
187 .pru_connect = udp6_connect,
188 .pru_connectx = udp6_connectx,
189 .pru_control = in6_control,
190 .pru_detach = udp6_detach,
191 .pru_disconnect = udp6_disconnect,
192 .pru_disconnectx = udp6_disconnectx,
193 .pru_peeraddr = in6_mapped_peeraddr,
194 .pru_send = udp6_send,
195 .pru_shutdown = udp_shutdown,
196 .pru_sockaddr = in6_mapped_sockaddr,
197 .pru_sosend = sosend,
198 .pru_soreceive = soreceive,
199 .pru_defunct = udp6_defunct,
200 };
201
202 /*
203 * subroutine of udp6_input(), mainly for source code readability.
204 */
205 static void
udp6_append(struct inpcb * last,struct ip6_hdr * ip6,struct sockaddr_in6 * udp_in6,struct mbuf * n,int off,struct ifnet * ifp)206 udp6_append(struct inpcb *last, struct ip6_hdr *ip6,
207 struct sockaddr_in6 *udp_in6, struct mbuf *n, int off, struct ifnet *ifp)
208 {
209 #pragma unused(ip6)
210 struct mbuf *__single opts = NULL;
211 int ret = 0;
212
213 if ((last->in6p_flags & INP_CONTROLOPTS) != 0 ||
214 SOFLOW_ENABLED(last->in6p_socket) ||
215 SO_RECV_CONTROL_OPTS(last->in6p_socket)) {
216 ret = ip6_savecontrol(last, n, &opts);
217 if (ret != 0) {
218 UDP_LOG(last, "ip_savecontrol error %d", ret);
219 m_freem(n);
220 m_freem(opts);
221 return;
222 }
223 }
224 m_adj(n, off);
225 if (nstat_collect) {
226 stats_functional_type ifnet_count_type = IFNET_COUNT_TYPE(ifp);
227 INP_ADD_RXSTAT(last, ifnet_count_type, 1, n->m_pkthdr.len);
228 }
229 so_recv_data_stat(last->in6p_socket, n, 0);
230 if (sbappendaddr(&last->in6p_socket->so_rcv,
231 SA(udp_in6), n, opts, NULL) == 0) {
232 UDP_LOG(last, "sbappendaddr full receive socket buffer");
233 udpstat.udps_fullsock++;
234 } else {
235 sorwakeup(last->in6p_socket);
236 }
237 }
238
239 int
udp6_input(struct mbuf ** mp,int * offp,int proto)240 udp6_input(struct mbuf **mp, int *offp, int proto)
241 {
242 #pragma unused(proto)
243 struct mbuf *m = *mp;
244 struct ifnet *__single ifp;
245 struct ip6_hdr *ip6;
246 struct udphdr *uh;
247 struct inpcb *__single in6p;
248 struct mbuf *__single opts = NULL;
249 int off = *offp;
250 int plen, ulen, ret = 0;
251 stats_functional_type ifnet_count_type = stats_functional_type_unclassified;
252 struct sockaddr_in6 udp_in6;
253 struct inpcbinfo *__single pcbinfo = &udbinfo;
254 struct sockaddr_in6 fromsa;
255 u_int16_t pf_tag = 0;
256 boolean_t is_wake_pkt = false;
257 drop_reason_t drop_reason = DROP_REASON_UNSPECIFIED;
258
259 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), return IPPROTO_DONE);
260
261 /* Expect 32-bit aligned data pointer on strict-align platforms */
262 MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m);
263
264 ifp = m->m_pkthdr.rcvif;
265 ip6 = mtod(m, struct ip6_hdr *);
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 drop_reason = DROP_REASON_IP_BAD_LENGTH;
284 goto bad;
285 }
286
287 /* destination port of 0 is illegal, based on RFC768. */
288 if (uh->uh_dport == 0) {
289 IF_UDP_STATINC(ifp, port0);
290 drop_reason = DROP_REASON_IP6_ILLEGAL_PORT;
291 goto bad;
292 }
293
294 /*
295 * Checksum extended UDP header and data.
296 */
297 if (udp6_input_checksum(m, uh, off, ulen)) {
298 drop_reason = DROP_REASON_IP6_BAD_UDP_CHECKSUM;
299 goto bad;
300 }
301
302 /*
303 * Construct sockaddr format source address.
304 */
305 init_sin6(&fromsa, m);
306 fromsa.sin6_port = uh->uh_sport;
307
308 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
309 int reuse_sock = 0, mcast_delivered = 0;
310 struct ip6_moptions *imo;
311
312 /*
313 * Deliver a multicast datagram to all sockets
314 * for which the local and remote addresses and ports match
315 * those of the incoming datagram. This allows more than
316 * one process to receive multicasts on the same port.
317 * (This really ought to be done for unicast datagrams as
318 * well, but that would cause problems with existing
319 * applications that open both address-specific sockets and
320 * a wildcard socket listening to the same port -- they would
321 * end up receiving duplicates of every unicast datagram.
322 * Those applications open the multiple sockets to overcome an
323 * inadequacy of the UDP socket interface, but for backwards
324 * compatibility we avoid the problem here rather than
325 * fixing the interface. Maybe 4.5BSD will remedy this?)
326 */
327
328 /*
329 * In a case that laddr should be set to the link-local
330 * address (this happens in RIPng), the multicast address
331 * specified in the received packet does not match with
332 * laddr. To cure this situation, the matching is relaxed
333 * if the receiving interface is the same as one specified
334 * in the socket and if the destination multicast address
335 * matches one of the multicast groups specified in the socket.
336 */
337
338 /*
339 * Construct sockaddr format source address.
340 */
341 init_sin6(&udp_in6, m); /* general init */
342 udp_in6.sin6_port = uh->uh_sport;
343 /*
344 * KAME note: usually we drop udphdr from mbuf here.
345 * We need udphdr for IPsec processing so we do that later.
346 */
347
348 /*
349 * Locate pcb(s) for datagram.
350 * (Algorithm copied from raw_intr().)
351 */
352 lck_rw_lock_shared(&pcbinfo->ipi_lock);
353
354 LIST_FOREACH(in6p, &udb, inp_list) {
355 #if IPSEC
356 int skipit;
357 #endif /* IPSEC */
358
359 if ((in6p->inp_vflag & INP_IPV6) == 0) {
360 continue;
361 }
362
363 if (inp_restricted_recv(in6p, ifp)) {
364 continue;
365 }
366 /*
367 * Skip unbound sockets before taking the lock on the socket as
368 * the test with the destination port in the header will fail
369 */
370 if (in6p->in6p_lport == 0) {
371 continue;
372 }
373
374 if (in_pcb_checkstate(in6p, WNT_ACQUIRE, 0) ==
375 WNT_STOPUSING) {
376 continue;
377 }
378
379 udp_lock(in6p->in6p_socket, 1, 0);
380
381 if (in_pcb_checkstate(in6p, WNT_RELEASE, 1) ==
382 WNT_STOPUSING) {
383 udp_unlock(in6p->in6p_socket, 1, 0);
384 continue;
385 }
386 if (in6p->in6p_lport != uh->uh_dport) {
387 udp_unlock(in6p->in6p_socket, 1, 0);
388 continue;
389 }
390
391 /*
392 * Handle socket delivery policy for any-source
393 * and source-specific multicast. [RFC3678]
394 */
395 imo = in6p->in6p_moptions;
396 if (imo && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
397 struct sockaddr_in6 mcaddr;
398 int blocked;
399
400 IM6O_LOCK(imo);
401 SOCKADDR_ZERO(&mcaddr, sizeof(struct sockaddr_in6));
402 mcaddr.sin6_len = sizeof(struct sockaddr_in6);
403 mcaddr.sin6_family = AF_INET6;
404 mcaddr.sin6_addr = ip6->ip6_dst;
405
406 blocked = im6o_mc_filter(imo, ifp,
407 &mcaddr, &fromsa);
408 IM6O_UNLOCK(imo);
409 if (blocked != MCAST_PASS) {
410 udp_unlock(in6p->in6p_socket, 1, 0);
411 if (blocked == MCAST_NOTSMEMBER ||
412 blocked == MCAST_MUTED) {
413 udpstat.udps_filtermcast++;
414 }
415 continue;
416 }
417 }
418 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
419 (!in6_are_addr_equal_scoped(&in6p->in6p_faddr,
420 &ip6->ip6_src, in6p->inp_fifscope, ifp->if_index) ||
421 in6p->in6p_fport != uh->uh_sport)) {
422 udp_unlock(in6p->in6p_socket, 1, 0);
423 continue;
424 }
425
426 reuse_sock = in6p->inp_socket->so_options &
427 (SO_REUSEPORT | SO_REUSEADDR);
428
429 #if NECP
430 skipit = 0;
431 if (!necp_socket_is_allowed_to_send_recv_v6(in6p,
432 uh->uh_dport, uh->uh_sport, &ip6->ip6_dst,
433 &ip6->ip6_src, ifp, pf_tag, NULL, NULL, NULL, NULL)) {
434 /* do not inject data to pcb */
435 skipit = 1;
436 UDP_LOG_DROP_NECP(ip6, uh, in6p, false);
437 }
438 if (skipit == 0)
439 #endif /* NECP */
440 {
441 struct mbuf *__single n = NULL;
442 /*
443 * KAME NOTE: do not
444 * m_copy(m, offset, ...) below.
445 * sbappendaddr() expects M_PKTHDR,
446 * and m_copy() will copy M_PKTHDR
447 * only if offset is 0.
448 */
449 if (reuse_sock) {
450 n = m_copy(m, 0, M_COPYALL);
451 }
452 udp6_append(in6p, ip6, &udp_in6, m,
453 off + sizeof(struct udphdr), ifp);
454 mcast_delivered++;
455 m = n;
456 }
457 if (is_wake_pkt) {
458 soevent(in6p->in6p_socket,
459 SO_FILT_HINT_LOCKED | SO_FILT_HINT_WAKE_PKT);
460 }
461 udp_unlock(in6p->in6p_socket, 1, 0);
462
463 /*
464 * Don't look for additional matches if this one does
465 * not have either the SO_REUSEPORT or SO_REUSEADDR
466 * socket options set. This heuristic avoids searching
467 * through all pcbs in the common case of a non-shared
468 * port. It assumes that an application will never
469 * clear these options after setting them.
470 */
471 if (reuse_sock == 0 || m == NULL) {
472 break;
473 }
474
475 /*
476 * Expect 32-bit aligned data pointer on strict-align
477 * platforms.
478 */
479 MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m);
480
481 /*
482 * Recompute IP and UDP header pointers for new mbuf
483 */
484 ip6 = mtod(m, struct ip6_hdr *);
485 uh = (struct udphdr *)(void *)((caddr_t)ip6 + off);
486 }
487 lck_rw_done(&pcbinfo->ipi_lock);
488
489 if (mcast_delivered == 0) {
490 /*
491 * No matching pcb found; discard datagram.
492 * (No need to send an ICMP Port Unreachable
493 * for a broadcast or multicast datgram.)
494 */
495 udpstat.udps_noport++;
496 udpstat.udps_noportmcast++;
497 IF_UDP_STATINC(ifp, port_unreach);
498 drop_reason = DROP_REASON_IP_UNREACHABLE_PORT;
499 goto bad;
500 }
501
502 /* free the extra copy of mbuf or skipped by NECP */
503 if (m != NULL) {
504 m_freem(m);
505 }
506 return IPPROTO_DONE;
507 }
508
509 #if IPSEC
510 /*
511 * UDP to port 4500 with a payload where the first four bytes are
512 * not zero is a UDP encapsulated IPsec packet. Packets where
513 * the payload is one byte and that byte is 0xFF are NAT keepalive
514 * packets. Decapsulate the ESP packet and carry on with IPsec input
515 * or discard the NAT keep-alive.
516 */
517 if (ipsec_bypass == 0 && (esp_udp_encap_port & 0xFFFF) != 0 &&
518 (uh->uh_dport == ntohs((u_short)esp_udp_encap_port) ||
519 uh->uh_sport == ntohs((u_short)esp_udp_encap_port))) {
520 union sockaddr_in_4_6 src = {};
521 union sockaddr_in_4_6 dst = {};
522
523 ipsec_fill_ip6_sockaddr_4_6_with_ifscope(&src, &ip6->ip6_src,
524 uh->uh_sport, ip6_input_getsrcifscope(m));
525 ipsec_fill_ip6_sockaddr_4_6_with_ifscope(&dst, &ip6->ip6_dst,
526 uh->uh_dport, ip6_input_getdstifscope(m));
527
528 /*
529 * Check if ESP or keepalive:
530 * 1. If the destination port of the incoming packet is 4500.
531 * 2. If the source port of the incoming packet is 4500,
532 * then check the SADB to match IP address and port.
533 */
534 bool check_esp = true;
535 if (uh->uh_dport != ntohs((u_short)esp_udp_encap_port)) {
536 check_esp = key_checksa_present(&dst, &src);
537 }
538
539 if (check_esp) {
540 int payload_len = ulen - sizeof(struct udphdr) > 4 ? 4 :
541 ulen - sizeof(struct udphdr);
542
543 if (m->m_len < off + sizeof(struct udphdr) + payload_len) {
544 if ((m = m_pullup(m, off + sizeof(struct udphdr) +
545 payload_len)) == NULL) {
546 udpstat.udps_hdrops++;
547 drop_reason = DROP_REASON_UDP_PACKET_SHORTER_THAN_HEADER;
548 goto bad;
549 }
550 /*
551 * Expect 32-bit aligned data pointer on strict-align
552 * platforms.
553 */
554 MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m);
555
556 ip6 = mtod(m, struct ip6_hdr *);
557 uh = (struct udphdr *)(void *)((caddr_t)ip6 + off);
558 }
559 /* Check for NAT keepalive packet */
560 if (payload_len == 1 && *(u_int8_t*)
561 ((caddr_t)uh + sizeof(struct udphdr)) == 0xFF) {
562 drop_reason = DROP_REASON_UDP_PACKET_SHORTER_THAN_HEADER;
563 goto bad;
564 } else if (payload_len == 4 && *(u_int32_t*)(void *)
565 ((caddr_t)uh + sizeof(struct udphdr)) != 0) {
566 /* UDP encapsulated IPsec packet to pass through NAT */
567 /* preserve the udp header */
568 *offp = off + sizeof(struct udphdr);
569 return esp6_input(mp, offp, IPPROTO_UDP);
570 }
571 }
572 }
573 #endif /* IPSEC */
574
575 /*
576 * Locate pcb for datagram.
577 */
578 in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport, ip6_input_getsrcifscope(m),
579 &ip6->ip6_dst, uh->uh_dport, ip6_input_getdstifscope(m), 1, m->m_pkthdr.rcvif);
580 if (in6p == NULL) {
581 IF_UDP_STATINC(ifp, port_unreach);
582
583 if (udp_log_in_vain) {
584 char buf[INET6_ADDRSTRLEN];
585
586 strlcpy(buf, ip6_sprintf(&ip6->ip6_dst), sizeof(buf));
587 if (udp_log_in_vain < 3) {
588 log(LOG_INFO, "Connection attempt to UDP "
589 "%s:%d from %s:%d\n", buf,
590 ntohs(uh->uh_dport),
591 ip6_sprintf(&ip6->ip6_src),
592 ntohs(uh->uh_sport));
593 } else if (!(m->m_flags & (M_BCAST | M_MCAST)) &&
594 !in6_are_addr_equal_scoped(&ip6->ip6_dst, &ip6->ip6_src, ip6_input_getdstifscope(m), ip6_input_getsrcifscope(m))) {
595 log(LOG_INFO, "Connection attempt "
596 "to UDP %s:%d from %s:%d\n", buf,
597 ntohs(uh->uh_dport),
598 ip6_sprintf(&ip6->ip6_src),
599 ntohs(uh->uh_sport));
600 }
601 }
602 udpstat.udps_noport++;
603 if (m->m_flags & M_MCAST) {
604 printf("UDP6: M_MCAST is set in a unicast packet.\n");
605 udpstat.udps_noportmcast++;
606 IF_UDP_STATINC(ifp, badmcast);
607 drop_reason = DROP_REASON_IP_MULTICAST_NO_PORT;
608 goto bad;
609 }
610
611 if (udp6_port_unreach_rlc_compress(&ip6->ip6_src, uh->uh_sport,
612 &ip6->ip6_dst, uh->uh_dport) == true) {
613 drop_reason = DROP_REASON_IP_UNREACHABLE_PORT;
614 goto bad;
615 }
616 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
617 return IPPROTO_DONE;
618 }
619
620 /*
621 * Construct sockaddr format source address.
622 * Stuff source address and datagram in user buffer.
623 */
624 udp_lock(in6p->in6p_socket, 1, 0);
625
626 #if NECP
627 if (!necp_socket_is_allowed_to_send_recv_v6(in6p, uh->uh_dport,
628 uh->uh_sport, &ip6->ip6_dst, &ip6->ip6_src, ifp, pf_tag, NULL, NULL, NULL, NULL)) {
629 in_pcb_checkstate(in6p, WNT_RELEASE, 1);
630 UDP_LOG_DROP_NECP(ip6, uh, in6p, false);
631 udp_unlock(in6p->in6p_socket, 1, 0);
632 IF_UDP_STATINC(ifp, badipsec);
633 drop_reason = DROP_REASON_IP_NECP_POLICY_DROP;
634 goto bad;
635 }
636 #endif /* NECP */
637
638 if (in_pcb_checkstate(in6p, WNT_RELEASE, 1) == WNT_STOPUSING) {
639 udp_unlock(in6p->in6p_socket, 1, 0);
640 IF_UDP_STATINC(ifp, cleanup);
641 drop_reason = DROP_REASON_UDP_PCB_GARBAGE_COLLECTED;
642 goto bad;
643 }
644
645 init_sin6(&udp_in6, m); /* general init */
646 udp_in6.sin6_port = uh->uh_sport;
647 if ((in6p->in6p_flags & INP_CONTROLOPTS) != 0 ||
648 SOFLOW_ENABLED(in6p->in6p_socket) ||
649 SO_RECV_CONTROL_OPTS(in6p->in6p_socket)) {
650 ret = ip6_savecontrol(in6p, m, &opts);
651 if (ret != 0) {
652 UDP_LOG(in6p, "ip_savecontrol error %d", ret);
653 udp_unlock(in6p->in6p_socket, 1, 0);
654 drop_reason = DROP_REASON_IP_ENOBUFS;
655 goto bad;
656 }
657 }
658 m_adj(m, off + sizeof(struct udphdr));
659 if (nstat_collect) {
660 ifnet_count_type = IFNET_COUNT_TYPE(ifp);
661 INP_ADD_RXSTAT(in6p, ifnet_count_type, 1, m->m_pkthdr.len);
662 }
663 so_recv_data_stat(in6p->in6p_socket, m, 0);
664 if (sbappendaddr(&in6p->in6p_socket->so_rcv,
665 SA(&udp_in6), m, opts, NULL) == 0) {
666 UDP_LOG(in6p, "sbappendaddr full receive socket buffer");
667 m = NULL;
668 opts = NULL;
669 udpstat.udps_fullsock++;
670 udp_unlock(in6p->in6p_socket, 1, 0);
671 goto bad;
672 }
673 if (is_wake_pkt) {
674 soevent(in6p->in6p_socket, SO_FILT_HINT_LOCKED | SO_FILT_HINT_WAKE_PKT);
675 }
676 sorwakeup(in6p->in6p_socket);
677 udp_unlock(in6p->in6p_socket, 1, 0);
678 return IPPROTO_DONE;
679 bad:
680 if (m != NULL) {
681 m_drop(m, DROPTAP_FLAG_DIR_IN | DROPTAP_FLAG_L2_MISSING, drop_reason, NULL, 0);
682 }
683 if (opts != NULL) {
684 m_freem(opts);
685 }
686 return IPPROTO_DONE;
687 }
688
689 void
udp6_ctlinput(int cmd,struct sockaddr * sa,void * d,__unused struct ifnet * ifp)690 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d, __unused struct ifnet *ifp)
691 {
692 struct udphdr uh;
693 struct ip6_hdr *ip6;
694 struct mbuf *m;
695 int off = 0;
696 struct ip6ctlparam *__single ip6cp = NULL;
697 struct icmp6_hdr *__single icmp6 = NULL;
698 const struct sockaddr_in6 *__single sa6_src = NULL;
699 void *__single cmdarg = NULL;
700 void (*notify)(struct inpcb *, int) = udp_notify;
701 struct inpcb *__single in6p;
702 struct udp_portonly {
703 u_int16_t uh_sport;
704 u_int16_t uh_dport;
705 } *uhp;
706
707 if (sa->sa_family != AF_INET6 ||
708 sa->sa_len != sizeof(struct sockaddr_in6)) {
709 return;
710 }
711
712 if ((unsigned)cmd >= PRC_NCMDS) {
713 return;
714 }
715 if (PRC_IS_REDIRECT(cmd)) {
716 notify = in6_rtchange;
717 d = NULL;
718 } else if (cmd == PRC_HOSTDEAD) {
719 d = NULL;
720 } else if (inet6ctlerrmap[cmd] == 0) {
721 return;
722 }
723
724 /* if the parameter is from icmp6, decode it. */
725 if (d != NULL) {
726 ip6cp = (struct ip6ctlparam *)d;
727 icmp6 = ip6cp->ip6c_icmp6;
728 m = ip6cp->ip6c_m;
729 ip6 = ip6cp->ip6c_ip6;
730 off = ip6cp->ip6c_off;
731 cmdarg = ip6cp->ip6c_cmdarg;
732 sa6_src = ip6cp->ip6c_src;
733 } else {
734 m = NULL;
735 ip6 = NULL;
736 cmdarg = NULL;
737 sa6_src = &sa6_any;
738 }
739
740 if (ip6 != NULL) {
741 #if SKYWALK
742 union sockaddr_in_4_6 sock_laddr;
743 struct protoctl_ev_val prctl_ev_val;
744 #endif /* SKYWALK */
745 /*
746 * XXX: We assume that when IPV6 is non NULL,
747 * M and OFF are valid.
748 */
749 /* check if we can safely examine src and dst ports */
750 if (m->m_pkthdr.len < off + sizeof(*uhp)) {
751 return;
752 }
753
754 bzero(&uh, sizeof(uh));
755 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
756
757 in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_dst, uh.uh_dport, ip6_input_getdstifscope(m),
758 &ip6->ip6_src, uh.uh_sport, ip6_input_getsrcifscope(m), 0, NULL);
759 if (cmd == PRC_MSGSIZE && in6p != NULL && !uuid_is_null(in6p->necp_client_uuid)) {
760 uuid_t null_uuid;
761 uuid_clear(null_uuid);
762 necp_update_flow_protoctl_event(null_uuid, in6p->necp_client_uuid,
763 PRC_MSGSIZE, ntohl(icmp6->icmp6_mtu), 0);
764 /*
765 * Avoid setting so_error when using Network.framework
766 * since the notification of PRC_MSGSIZE has been delivered
767 * through NECP.
768 */
769 in6_pcbnotify(&udbinfo, sa, uh.uh_dport,
770 SA(ip6cp->ip6c_src), uh.uh_sport,
771 cmd, cmdarg, NULL);
772 } else {
773 in6_pcbnotify(&udbinfo, sa, uh.uh_dport,
774 SA(ip6cp->ip6c_src), uh.uh_sport,
775 cmd, cmdarg, notify);
776 }
777 #if SKYWALK
778 bzero(&prctl_ev_val, sizeof(prctl_ev_val));
779 bzero(&sock_laddr, sizeof(sock_laddr));
780
781 if (cmd == PRC_MSGSIZE && icmp6 != NULL) {
782 prctl_ev_val.val = ntohl(icmp6->icmp6_mtu);
783 }
784 sock_laddr.sin6.sin6_family = AF_INET6;
785 sock_laddr.sin6.sin6_len = sizeof(sock_laddr.sin6);
786 sock_laddr.sin6.sin6_addr = ip6->ip6_src;
787
788 protoctl_event_enqueue_nwk_wq_entry(ifp,
789 SA(&sock_laddr), sa,
790 uh.uh_sport, uh.uh_dport, IPPROTO_UDP,
791 cmd, &prctl_ev_val);
792 #endif /* SKYWALK */
793 }
794 /*
795 * XXX The else condition here was broken for a long time.
796 * Fixing it made us deliver notification correctly but broke
797 * some frameworks that didn't handle it well.
798 * For now we have removed it and will revisit it later.
799 */
800 }
801
802 static int
udp6_abort(struct socket * so)803 udp6_abort(struct socket *so)
804 {
805 struct inpcb *__single inp;
806
807 inp = sotoinpcb(so);
808 if (inp == NULL) {
809 panic("%s: so=%p null inp", __func__, so);
810 /* NOTREACHED */
811 }
812 soisdisconnected(so);
813 in6_pcbdetach(inp);
814 return 0;
815 }
816
817 static int
udp6_attach(struct socket * so,int proto,struct proc * p)818 udp6_attach(struct socket *so, int proto, struct proc *p)
819 {
820 #pragma unused(proto)
821 struct inpcb *__single inp;
822 int error;
823
824 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
825 error = soreserve(so, udp_sendspace, udp_recvspace);
826 if (error) {
827 return error;
828 }
829 }
830
831 inp = sotoinpcb(so);
832 if (inp != NULL) {
833 return EINVAL;
834 }
835
836 error = in_pcballoc(so, &udbinfo, p);
837 if (error) {
838 return error;
839 }
840
841 inp = (struct inpcb *)so->so_pcb;
842 inp->inp_vflag |= INP_IPV6;
843 if (ip6_mapped_addr_on) {
844 inp->inp_vflag |= INP_IPV4;
845 }
846 inp->in6p_hops = -1; /* use kernel default */
847 inp->in6p_cksum = -1; /* just to be sure */
848 /*
849 * XXX: ugly!!
850 * IPv4 TTL initialization is necessary for an IPv6 socket as well,
851 * because the socket may be bound to an IPv6 wildcard address,
852 * which may match an IPv4-mapped IPv6 address.
853 */
854 inp->inp_ip_ttl = (u_char)ip_defttl;
855 if (nstat_collect) {
856 nstat_udp_new_pcb(inp);
857 }
858 return 0;
859 }
860
861 static int
udp6_bind(struct socket * so,struct sockaddr * nam,struct proc * p)862 udp6_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
863 {
864 struct inpcb *__single inp;
865 int error;
866
867 inp = sotoinpcb(so);
868 if (inp == NULL) {
869 return EINVAL;
870 }
871 inp_enter_bind_in_progress(so);
872
873 const uint8_t old_flags = inp->inp_vflag;
874 inp->inp_vflag &= ~INP_IPV4;
875 inp->inp_vflag |= INP_IPV6;
876
877 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
878 struct sockaddr_in6 *__single sin6_p;
879
880 sin6_p = SIN6(nam);
881
882 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
883 inp->inp_vflag |= INP_IPV4;
884 inp->inp_vflag &= ~INP_V4MAPPEDV6;
885 } else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
886 struct sockaddr_in sin;
887
888 in6_sin6_2_sin(&sin, sin6_p);
889 inp->inp_vflag |= INP_IPV4;
890 inp->inp_vflag &= ~INP_IPV6;
891 inp->inp_vflag |= INP_V4MAPPEDV6;
892
893 error = in_pcbbind(inp, SA(&sin), NULL, p);
894 if (error != 0) {
895 inp->inp_vflag = old_flags;
896 }
897 goto out;
898 }
899 }
900
901 error = in6_pcbbind(inp, nam, NULL, p);
902 if (error != 0) {
903 inp->inp_vflag = old_flags;
904 }
905 out:
906 UDP_LOG_BIND(inp, error);
907
908 inp_exit_bind_in_progress(so);
909
910 return error;
911 }
912
913 int
udp6_connect(struct socket * so,struct sockaddr * nam,struct proc * p)914 udp6_connect(struct socket *so, struct sockaddr *nam, struct proc *p)
915 {
916 struct inpcb *__single inp;
917 int error;
918 struct sockaddr_in6 *__single sin6_p = SIN6(nam);
919
920 #if defined(NECP) && defined(FLOW_DIVERT)
921 int should_use_flow_divert = 0;
922 #endif /* defined(NECP) && defined(FLOW_DIVERT) */
923
924 inp = sotoinpcb(so);
925 if (inp == NULL) {
926 return EINVAL;
927 }
928
929 inp_enter_bind_in_progress(so);
930
931 #if defined(NECP) && defined(FLOW_DIVERT)
932 should_use_flow_divert = necp_socket_should_use_flow_divert(inp);
933 #endif /* defined(NECP) && defined(FLOW_DIVERT) */
934
935 /*
936 * It is possible that the socket is bound to v4 mapped v6 address.
937 * Post that do not allow connect to a v6 endpoint.
938 */
939 if (inp->inp_vflag & INP_V4MAPPEDV6 &&
940 !IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
941 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
942 sin6_p->sin6_addr.s6_addr[10] = 0xff;
943 sin6_p->sin6_addr.s6_addr[11] = 0xff;
944 } else {
945 error = EINVAL;
946 goto done;
947 }
948 }
949
950 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
951 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
952 struct sockaddr_in sin;
953 const uint8_t old_flags = inp->inp_vflag;
954
955 if (inp->inp_faddr.s_addr != INADDR_ANY) {
956 error = EISCONN;
957 goto done;
958 }
959 /*
960 * If bound to an IPv6 address, we cannot connect to
961 * an IPv4 mapped address
962 */
963 if (inp->inp_vflag == INP_IPV6) {
964 error = EINVAL;
965 goto done;
966 }
967
968 if (!(so->so_flags1 & SOF1_CONNECT_COUNTED)) {
969 so->so_flags1 |= SOF1_CONNECT_COUNTED;
970 INC_ATOMIC_INT64_LIM(net_api_stats.nas_socket_inet_dgram_connected);
971 }
972
973 in6_sin6_2_sin(&sin, sin6_p);
974 #if defined(NECP) && defined(FLOW_DIVERT)
975 if (should_use_flow_divert) {
976 goto do_flow_divert;
977 }
978 #endif /* defined(NECP) && defined(FLOW_DIVERT) */
979 inp->inp_vflag |= INP_IPV4;
980 inp->inp_vflag &= ~INP_IPV6;
981 inp->inp_vflag |= INP_V4MAPPEDV6;
982
983 error = in_pcbconnect(inp, SA(&sin), p, IFSCOPE_NONE, NULL);
984 if (error == 0) {
985 #if NECP
986 /* Update NECP client with connected five-tuple */
987 if (!uuid_is_null(inp->necp_client_uuid)) {
988 socket_unlock(so, 0);
989 necp_client_assign_from_socket(so->last_pid, inp->necp_client_uuid, inp);
990 socket_lock(so, 0);
991 }
992 #endif /* NECP */
993 soisconnected(so);
994 } else {
995 inp->inp_vflag = old_flags;
996 }
997 goto done;
998 }
999 }
1000
1001 /*
1002 * If bound to an IPv4 mapped address, we cannot connect to
1003 * an IPv6 address
1004 */
1005 if (inp->inp_vflag == INP_IPV4) {
1006 error = EINVAL;
1007 goto done;
1008 }
1009
1010 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1011 error = EISCONN;
1012 goto done;
1013 }
1014
1015 if (!(so->so_flags1 & SOF1_CONNECT_COUNTED)) {
1016 so->so_flags1 |= SOF1_CONNECT_COUNTED;
1017 INC_ATOMIC_INT64_LIM(net_api_stats.nas_socket_inet6_dgram_connected);
1018 }
1019
1020 #if defined(NECP) && defined(FLOW_DIVERT)
1021 do_flow_divert:
1022 if (should_use_flow_divert) {
1023 error = flow_divert_pcb_init(so);
1024 if (error == 0) {
1025 error = flow_divert_connect_out(so, nam, p);
1026 }
1027 goto done;
1028 }
1029 #endif /* defined(NECP) && defined(FLOW_DIVERT) */
1030
1031 error = in6_pcbconnect(inp, nam, p);
1032 if (error == 0) {
1033 /* should be non mapped addr */
1034 if (ip6_mapped_addr_on ||
1035 (inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
1036 inp->inp_vflag &= ~INP_IPV4;
1037 inp->inp_vflag |= INP_IPV6;
1038 }
1039 #if NECP
1040 /* Update NECP client with connected five-tuple */
1041 if (!uuid_is_null(inp->necp_client_uuid)) {
1042 socket_unlock(so, 0);
1043 necp_client_assign_from_socket(so->last_pid, inp->necp_client_uuid, inp);
1044 socket_lock(so, 0);
1045 }
1046 #endif /* NECP */
1047 soisconnected(so);
1048 if (inp->inp_flowhash == 0) {
1049 inp_calc_flowhash(inp);
1050 ASSERT(inp->inp_flowhash != 0);
1051 }
1052 /* update flowinfo - RFC 6437 */
1053 if (inp->inp_flow == 0 &&
1054 inp->in6p_flags & IN6P_AUTOFLOWLABEL) {
1055 inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
1056 inp->inp_flow |=
1057 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
1058 }
1059 inp->inp_connect_timestamp = mach_continuous_time();
1060 }
1061 done:
1062 UDP_LOG_CONNECT(inp, error);
1063
1064 inp_exit_bind_in_progress(so);
1065
1066 return error;
1067 }
1068
1069 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)1070 udp6_connectx(struct socket *so, struct sockaddr *src,
1071 struct sockaddr *dst, struct proc *p, uint32_t ifscope,
1072 sae_associd_t aid, sae_connid_t *pcid, uint32_t flags, void *arg,
1073 uint32_t arglen, struct uio *uio, user_ssize_t *bytes_written)
1074 {
1075 return udp_connectx_common(so, AF_INET6, src, dst,
1076 p, ifscope, aid, pcid, flags, arg, arglen, uio, bytes_written);
1077 }
1078
1079 static int
udp6_detach(struct socket * so)1080 udp6_detach(struct socket *so)
1081 {
1082 struct inpcb *__single inp;
1083
1084 inp = sotoinpcb(so);
1085 if (inp == NULL) {
1086 return EINVAL;
1087 }
1088
1089 UDP_LOG_CONNECTION_SUMMARY(inp);
1090
1091 in6_pcbdetach(inp);
1092 return 0;
1093 }
1094
1095 static int
udp6_disconnect(struct socket * so)1096 udp6_disconnect(struct socket *so)
1097 {
1098 struct inpcb *__single inp;
1099
1100 inp = sotoinpcb(so);
1101 if (inp == NULL
1102 #if NECP
1103 || (necp_socket_should_use_flow_divert(inp))
1104 #endif /* NECP */
1105 ) {
1106 return inp == NULL ? EINVAL : EPROTOTYPE;
1107 }
1108
1109 if (inp->inp_vflag & INP_IPV4) {
1110 struct pr_usrreqs *__single pru;
1111
1112 pru = ip_protox[IPPROTO_UDP]->pr_usrreqs;
1113 return (*pru->pru_disconnect)(so);
1114 }
1115
1116 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1117 return ENOTCONN;
1118 }
1119
1120 UDP_LOG_CONNECTION_SUMMARY(inp);
1121
1122 in6_pcbdisconnect(inp);
1123
1124 /* reset flow-controlled state, just in case */
1125 inp_reset_fc_state(inp);
1126
1127 inp->in6p_laddr = in6addr_any;
1128 inp->inp_lifscope = IFSCOPE_NONE;
1129 inp->in6p_last_outifp = NULL;
1130 #if SKYWALK
1131 if (NETNS_TOKEN_VALID(&inp->inp_netns_token)) {
1132 netns_set_ifnet(&inp->inp_netns_token, NULL);
1133 }
1134 #endif /* SKYWALK */
1135
1136 so->so_state &= ~SS_ISCONNECTED; /* XXX */
1137 return 0;
1138 }
1139
1140 static int
udp6_disconnectx(struct socket * so,sae_associd_t aid,sae_connid_t cid)1141 udp6_disconnectx(struct socket *so, sae_associd_t aid, sae_connid_t cid)
1142 {
1143 #pragma unused(cid)
1144 if (aid != SAE_ASSOCID_ANY && aid != SAE_ASSOCID_ALL) {
1145 return EINVAL;
1146 }
1147
1148 return udp6_disconnect(so);
1149 }
1150
1151 static int
udp6_send(struct socket * so,int flags,struct mbuf * m,struct sockaddr * addr,struct mbuf * control,struct proc * p)1152 udp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
1153 struct mbuf *control, struct proc *p)
1154 {
1155 struct inpcb *__single inp;
1156 int error = 0;
1157 #if defined(NECP) && defined(FLOW_DIVERT)
1158 int should_use_flow_divert = 0;
1159 #endif /* defined(NECP) && defined(FLOW_DIVERT) */
1160 #if CONTENT_FILTER
1161 struct m_tag *__single cfil_tag = NULL;
1162 struct sockaddr *__single cfil_faddr = NULL;
1163 #endif
1164
1165 inp = sotoinpcb(so);
1166 if (inp == NULL) {
1167 error = EINVAL;
1168 goto bad;
1169 }
1170
1171 #if CONTENT_FILTER
1172 /* If socket is subject to UDP Content Filter and unconnected, get addr from tag. */
1173 if (CFIL_DGRAM_FILTERED(so) && !addr && IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1174 cfil_tag = cfil_dgram_get_socket_state(m, NULL, NULL, &cfil_faddr, NULL);
1175 if (cfil_tag) {
1176 addr = SA(cfil_faddr);
1177 }
1178 }
1179 #endif
1180
1181 #if defined(NECP) && defined(FLOW_DIVERT)
1182 should_use_flow_divert = necp_socket_should_use_flow_divert(inp);
1183 #endif /* defined(NECP) && defined(FLOW_DIVERT) */
1184
1185 if (addr != NULL) {
1186 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
1187 error = EINVAL;
1188 goto bad;
1189 }
1190 if (addr->sa_family != AF_INET6) {
1191 error = EAFNOSUPPORT;
1192 goto bad;
1193 }
1194 }
1195
1196 if (ip6_mapped_addr_on || (inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
1197 int hasv4addr;
1198 struct sockaddr_in6 *__single sin6 = NULL;
1199
1200 if (addr == NULL) {
1201 hasv4addr = (inp->inp_vflag & INP_IPV4);
1202 } else {
1203 sin6 = SIN6(addr);
1204 hasv4addr =
1205 IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) ? 1 : 0;
1206 }
1207 if (hasv4addr) {
1208 struct pr_usrreqs *__single pru;
1209
1210 if (sin6 != NULL) {
1211 in6_sin6_2_sin_in_sock(addr);
1212 }
1213 #if defined(NECP) && defined(FLOW_DIVERT)
1214 if (should_use_flow_divert) {
1215 goto do_flow_divert;
1216 }
1217 #endif /* defined(NECP) && defined(FLOW_DIVERT) */
1218 pru = ip_protox[IPPROTO_UDP]->pr_usrreqs;
1219 error = ((*pru->pru_send)(so, flags, m, addr,
1220 control, p));
1221 if (error == EJUSTRETURN) {
1222 error = 0;
1223 }
1224 #if CONTENT_FILTER
1225 if (cfil_tag) {
1226 m_tag_free(cfil_tag);
1227 }
1228 #endif
1229 /* addr will just be freed in sendit(). */
1230 return error;
1231 }
1232 }
1233
1234 #if defined(NECP) && defined(FLOW_DIVERT)
1235 do_flow_divert:
1236 if (should_use_flow_divert) {
1237 /* Implicit connect */
1238 error = flow_divert_implicit_data_out(so, flags, m, addr, control, p);
1239 #if CONTENT_FILTER
1240 if (cfil_tag) {
1241 m_tag_free(cfil_tag);
1242 }
1243 #endif
1244 return error;
1245 }
1246 #endif /* defined(NECP) && defined(FLOW_DIVERT) */
1247
1248 so_update_tx_data_stats(so, 1, m->m_pkthdr.len);
1249
1250 in_pcb_check_management_entitled(inp);
1251 in_pcb_check_ultra_constrained_entitled(inp);
1252
1253 #if SKYWALK
1254 sk_protect_t __single protect = sk_async_transmit_protect();
1255 #endif /* SKYWALK */
1256 error = udp6_output(inp, m, addr, control, p);
1257 #if SKYWALK
1258 sk_async_transmit_unprotect(protect);
1259 #endif /* SKYWALK */
1260
1261 #if CONTENT_FILTER
1262 if (cfil_tag) {
1263 m_tag_free(cfil_tag);
1264 }
1265 #endif
1266 return error;
1267
1268 bad:
1269 VERIFY(error != 0);
1270
1271 if (m != NULL) {
1272 m_freem(m);
1273 }
1274 if (control != NULL) {
1275 m_freem(control);
1276 }
1277 #if CONTENT_FILTER
1278 if (cfil_tag) {
1279 m_tag_free(cfil_tag);
1280 }
1281 #endif
1282 return error;
1283 }
1284
1285 /*
1286 * Checksum extended UDP header and data.
1287 */
1288 static int
udp6_input_checksum(struct mbuf * m,struct udphdr * uh,int off,int ulen)1289 udp6_input_checksum(struct mbuf *m, struct udphdr *uh, int off, int ulen)
1290 {
1291 struct ifnet *__single ifp = m->m_pkthdr.rcvif;
1292 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1293
1294 if (!(m->m_pkthdr.csum_flags & CSUM_DATA_VALID) &&
1295 uh->uh_sum == 0) {
1296 /* UDP/IPv6 checksum is mandatory (RFC2460) */
1297
1298 /*
1299 * If checksum was already validated, ignore this check.
1300 * This is necessary for transport-mode ESP, which may be
1301 * getting UDP payloads without checksums when the network
1302 * has a NAT64.
1303 */
1304 udpstat.udps_nosum++;
1305 goto badsum;
1306 }
1307
1308 if ((hwcksum_rx || (ifp->if_flags & IFF_LOOPBACK) ||
1309 (m->m_pkthdr.pkt_flags & PKTF_LOOP)) &&
1310 (m->m_pkthdr.csum_flags & CSUM_DATA_VALID)) {
1311 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
1312 uh->uh_sum = m->m_pkthdr.csum_rx_val;
1313 } else {
1314 uint32_t sum = m->m_pkthdr.csum_rx_val;
1315 uint32_t start = m->m_pkthdr.csum_rx_start;
1316 int32_t trailer = (m_pktlen(m) - (off + ulen));
1317
1318 /*
1319 * Perform 1's complement adjustment of octets
1320 * that got included/excluded in the hardware-
1321 * calculated checksum value. Also take care
1322 * of any trailing bytes and subtract out
1323 * their partial sum.
1324 */
1325 ASSERT(trailer >= 0);
1326 if ((m->m_pkthdr.csum_flags & CSUM_PARTIAL) &&
1327 (start != off || trailer != 0)) {
1328 uint32_t swbytes = (uint32_t)trailer;
1329 uint16_t s = 0, d = 0;
1330
1331 if (IN6_IS_SCOPE_EMBED(&ip6->ip6_src)) {
1332 s = ip6->ip6_src.s6_addr16[1];
1333 ip6->ip6_src.s6_addr16[1] = 0;
1334 }
1335 if (IN6_IS_SCOPE_EMBED(&ip6->ip6_dst)) {
1336 d = ip6->ip6_dst.s6_addr16[1];
1337 ip6->ip6_dst.s6_addr16[1] = 0;
1338 }
1339
1340 /* callee folds in sum */
1341 sum = m_adj_sum16(m, start, off, ulen, sum);
1342 if (off > start) {
1343 swbytes += (off - start);
1344 } else {
1345 swbytes += (start - off);
1346 }
1347
1348 if (IN6_IS_SCOPE_EMBED(&ip6->ip6_src)) {
1349 ip6->ip6_src.s6_addr16[1] = s;
1350 }
1351 if (IN6_IS_SCOPE_EMBED(&ip6->ip6_dst)) {
1352 ip6->ip6_dst.s6_addr16[1] = d;
1353 }
1354
1355 if (swbytes != 0) {
1356 udp_in_cksum_stats(swbytes);
1357 }
1358 if (trailer != 0) {
1359 m_adj(m, -trailer);
1360 }
1361 }
1362
1363 uh->uh_sum = in6_pseudo(&ip6->ip6_src, &ip6->ip6_dst,
1364 sum + htonl(ulen + IPPROTO_UDP));
1365 }
1366 uh->uh_sum ^= 0xffff;
1367 } else {
1368 udp_in6_cksum_stats(ulen);
1369 uh->uh_sum = in6_cksum(m, IPPROTO_UDP, off, ulen);
1370 }
1371
1372 if (uh->uh_sum != 0) {
1373 badsum:
1374 udpstat.udps_badsum++;
1375 IF_UDP_STATINC(ifp, badchksum);
1376 return -1;
1377 }
1378
1379 return 0;
1380 }
1381
1382 int
udp6_defunct(struct socket * so)1383 udp6_defunct(struct socket *so)
1384 {
1385 struct ip_moptions *__single imo;
1386 struct ip6_moptions *__single im6o;
1387 struct inpcb *__single inp;
1388
1389 inp = sotoinpcb(so);
1390 if (inp == NULL) {
1391 return EINVAL;
1392 }
1393
1394 im6o = inp->in6p_moptions;
1395 inp->in6p_moptions = NULL;
1396 if (im6o != NULL) {
1397 struct proc *p = current_proc();
1398
1399 SODEFUNCTLOG("%s[%d, %s]: defuncting so 0x%llu drop ipv6 multicast memberships",
1400 __func__, proc_pid(p), proc_best_name(p),
1401 so->so_gencnt);
1402 IM6O_REMREF(im6o);
1403 }
1404 imo = inp->inp_moptions;
1405 if (imo != NULL) {
1406 struct proc *__single p = current_proc();
1407
1408 SODEFUNCTLOG("%s[%d, %s]: defuncting so 0x%llu drop ipv4 multicast memberships",
1409 __func__, proc_pid(p), proc_best_name(p),
1410 so->so_gencnt);
1411
1412 inp->inp_moptions = NULL;
1413
1414 IMO_REMREF(imo);
1415 }
1416
1417 return 0;
1418 }
1419