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 m_freem(n);
219 m_freem(opts);
220 return;
221 }
222 }
223 m_adj(n, off);
224 if (nstat_collect) {
225 stats_functional_type ifnet_count_type = IFNET_COUNT_TYPE(ifp);
226 INP_ADD_STAT(last, ifnet_count_type, rxpackets, 1);
227 INP_ADD_STAT(last, ifnet_count_type, rxbytes, n->m_pkthdr.len);
228 inp_set_activity_bitmap(last);
229 }
230 so_recv_data_stat(last->in6p_socket, n, 0);
231 if (sbappendaddr(&last->in6p_socket->so_rcv,
232 SA(udp_in6), n, opts, NULL) == 0) {
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_none;
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_IP_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_IP_BAD_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 }
437 if (skipit == 0)
438 #endif /* NECP */
439 {
440 struct mbuf *__single n = NULL;
441 /*
442 * KAME NOTE: do not
443 * m_copy(m, offset, ...) below.
444 * sbappendaddr() expects M_PKTHDR,
445 * and m_copy() will copy M_PKTHDR
446 * only if offset is 0.
447 */
448 if (reuse_sock) {
449 n = m_copy(m, 0, M_COPYALL);
450 }
451 udp6_append(in6p, ip6, &udp_in6, m,
452 off + sizeof(struct udphdr), ifp);
453 mcast_delivered++;
454 m = n;
455 }
456 if (is_wake_pkt) {
457 soevent(in6p->in6p_socket,
458 SO_FILT_HINT_LOCKED | SO_FILT_HINT_WAKE_PKT);
459 }
460 udp_unlock(in6p->in6p_socket, 1, 0);
461
462 /*
463 * Don't look for additional matches if this one does
464 * not have either the SO_REUSEPORT or SO_REUSEADDR
465 * socket options set. This heuristic avoids searching
466 * through all pcbs in the common case of a non-shared
467 * port. It assumes that an application will never
468 * clear these options after setting them.
469 */
470 if (reuse_sock == 0 || m == NULL) {
471 break;
472 }
473
474 /*
475 * Expect 32-bit aligned data pointer on strict-align
476 * platforms.
477 */
478 MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m);
479
480 /*
481 * Recompute IP and UDP header pointers for new mbuf
482 */
483 ip6 = mtod(m, struct ip6_hdr *);
484 uh = (struct udphdr *)(void *)((caddr_t)ip6 + off);
485 }
486 lck_rw_done(&pcbinfo->ipi_lock);
487
488 if (mcast_delivered == 0) {
489 /*
490 * No matching pcb found; discard datagram.
491 * (No need to send an ICMP Port Unreachable
492 * for a broadcast or multicast datgram.)
493 */
494 udpstat.udps_noport++;
495 udpstat.udps_noportmcast++;
496 IF_UDP_STATINC(ifp, port_unreach);
497 drop_reason = DROP_REASON_IP_UNREACHABLE_PORT;
498 goto bad;
499 }
500
501 /* free the extra copy of mbuf or skipped by NECP */
502 if (m != NULL) {
503 m_freem(m);
504 }
505 return IPPROTO_DONE;
506 }
507
508 #if IPSEC
509 /*
510 * UDP to port 4500 with a payload where the first four bytes are
511 * not zero is a UDP encapsulated IPsec packet. Packets where
512 * the payload is one byte and that byte is 0xFF are NAT keepalive
513 * packets. Decapsulate the ESP packet and carry on with IPsec input
514 * or discard the NAT keep-alive.
515 */
516 if (ipsec_bypass == 0 && (esp_udp_encap_port & 0xFFFF) != 0 &&
517 (uh->uh_dport == ntohs((u_short)esp_udp_encap_port) ||
518 uh->uh_sport == ntohs((u_short)esp_udp_encap_port))) {
519 union sockaddr_in_4_6 src = {};
520 union sockaddr_in_4_6 dst = {};
521
522 ipsec_fill_ip6_sockaddr_4_6_with_ifscope(&src, &ip6->ip6_src,
523 uh->uh_sport, ip6_input_getsrcifscope(m));
524 ipsec_fill_ip6_sockaddr_4_6_with_ifscope(&dst, &ip6->ip6_dst,
525 uh->uh_dport, ip6_input_getdstifscope(m));
526
527 /*
528 * Check if ESP or keepalive:
529 * 1. If the destination port of the incoming packet is 4500.
530 * 2. If the source port of the incoming packet is 4500,
531 * then check the SADB to match IP address and port.
532 */
533 bool check_esp = true;
534 if (uh->uh_dport != ntohs((u_short)esp_udp_encap_port)) {
535 check_esp = key_checksa_present(&dst, &src);
536 }
537
538 if (check_esp) {
539 int payload_len = ulen - sizeof(struct udphdr) > 4 ? 4 :
540 ulen - sizeof(struct udphdr);
541
542 if (m->m_len < off + sizeof(struct udphdr) + payload_len) {
543 if ((m = m_pullup(m, off + sizeof(struct udphdr) +
544 payload_len)) == NULL) {
545 udpstat.udps_hdrops++;
546 goto bad;
547 }
548 /*
549 * Expect 32-bit aligned data pointer on strict-align
550 * platforms.
551 */
552 MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m);
553
554 ip6 = mtod(m, struct ip6_hdr *);
555 uh = (struct udphdr *)(void *)((caddr_t)ip6 + off);
556 }
557 /* Check for NAT keepalive packet */
558 if (payload_len == 1 && *(u_int8_t*)
559 ((caddr_t)uh + sizeof(struct udphdr)) == 0xFF) {
560 goto bad;
561 } else if (payload_len == 4 && *(u_int32_t*)(void *)
562 ((caddr_t)uh + sizeof(struct udphdr)) != 0) {
563 /* UDP encapsulated IPsec packet to pass through NAT */
564 /* preserve the udp header */
565 *offp = off + sizeof(struct udphdr);
566 return esp6_input(mp, offp, IPPROTO_UDP);
567 }
568 }
569 }
570 #endif /* IPSEC */
571
572 /*
573 * Locate pcb for datagram.
574 */
575 in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport, ip6_input_getsrcifscope(m),
576 &ip6->ip6_dst, uh->uh_dport, ip6_input_getdstifscope(m), 1, m->m_pkthdr.rcvif);
577 if (in6p == NULL) {
578 IF_UDP_STATINC(ifp, port_unreach);
579
580 if (udp_log_in_vain) {
581 char buf[INET6_ADDRSTRLEN];
582
583 strlcpy(buf, ip6_sprintf(&ip6->ip6_dst), sizeof(buf));
584 if (udp_log_in_vain < 3) {
585 log(LOG_INFO, "Connection attempt to UDP "
586 "%s:%d from %s:%d\n", buf,
587 ntohs(uh->uh_dport),
588 ip6_sprintf(&ip6->ip6_src),
589 ntohs(uh->uh_sport));
590 } else if (!(m->m_flags & (M_BCAST | M_MCAST)) &&
591 !in6_are_addr_equal_scoped(&ip6->ip6_dst, &ip6->ip6_src, ip6_input_getdstifscope(m), ip6_input_getsrcifscope(m))) {
592 log(LOG_INFO, "Connection attempt "
593 "to UDP %s:%d from %s:%d\n", buf,
594 ntohs(uh->uh_dport),
595 ip6_sprintf(&ip6->ip6_src),
596 ntohs(uh->uh_sport));
597 }
598 }
599 udpstat.udps_noport++;
600 if (m->m_flags & M_MCAST) {
601 printf("UDP6: M_MCAST is set in a unicast packet.\n");
602 udpstat.udps_noportmcast++;
603 IF_UDP_STATINC(ifp, badmcast);
604 drop_reason = DROP_REASON_IP_MULTICAST_NO_PORT;
605 goto bad;
606 }
607 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
608 return IPPROTO_DONE;
609 }
610
611 /*
612 * Construct sockaddr format source address.
613 * Stuff source address and datagram in user buffer.
614 */
615 udp_lock(in6p->in6p_socket, 1, 0);
616
617 #if NECP
618 if (!necp_socket_is_allowed_to_send_recv_v6(in6p, uh->uh_dport,
619 uh->uh_sport, &ip6->ip6_dst, &ip6->ip6_src, ifp, pf_tag, NULL, NULL, NULL, NULL)) {
620 in_pcb_checkstate(in6p, WNT_RELEASE, 1);
621 udp_unlock(in6p->in6p_socket, 1, 0);
622 IF_UDP_STATINC(ifp, badipsec);
623 drop_reason = DROP_REASON_IP_NECP_POLICY_DROP;
624 goto bad;
625 }
626 #endif /* NECP */
627
628 if (in_pcb_checkstate(in6p, WNT_RELEASE, 1) == WNT_STOPUSING) {
629 udp_unlock(in6p->in6p_socket, 1, 0);
630 IF_UDP_STATINC(ifp, cleanup);
631 goto bad;
632 }
633
634 init_sin6(&udp_in6, m); /* general init */
635 udp_in6.sin6_port = uh->uh_sport;
636 if ((in6p->in6p_flags & INP_CONTROLOPTS) != 0 ||
637 SOFLOW_ENABLED(in6p->in6p_socket) ||
638 SO_RECV_CONTROL_OPTS(in6p->in6p_socket)) {
639 ret = ip6_savecontrol(in6p, m, &opts);
640 if (ret != 0) {
641 udp_unlock(in6p->in6p_socket, 1, 0);
642 drop_reason = DROP_REASON_IP_ENOBUFS;
643 goto bad;
644 }
645 }
646 m_adj(m, off + sizeof(struct udphdr));
647 if (nstat_collect) {
648 ifnet_count_type = IFNET_COUNT_TYPE(ifp);
649 INP_ADD_STAT(in6p, ifnet_count_type, rxpackets, 1);
650 INP_ADD_STAT(in6p, ifnet_count_type, rxbytes, m->m_pkthdr.len);
651 inp_set_activity_bitmap(in6p);
652 }
653 so_recv_data_stat(in6p->in6p_socket, m, 0);
654 if (sbappendaddr(&in6p->in6p_socket->so_rcv,
655 SA(&udp_in6), m, opts, NULL) == 0) {
656 m = NULL;
657 opts = NULL;
658 udpstat.udps_fullsock++;
659 udp_unlock(in6p->in6p_socket, 1, 0);
660 goto bad;
661 }
662 if (is_wake_pkt) {
663 soevent(in6p->in6p_socket, SO_FILT_HINT_LOCKED | SO_FILT_HINT_WAKE_PKT);
664 }
665 sorwakeup(in6p->in6p_socket);
666 udp_unlock(in6p->in6p_socket, 1, 0);
667 return IPPROTO_DONE;
668 bad:
669 if (m != NULL) {
670 m_drop(m, DROPTAP_FLAG_DIR_IN | DROPTAP_FLAG_L2_MISSING, drop_reason, NULL, 0);
671 }
672 if (opts != NULL) {
673 m_freem(opts);
674 }
675 return IPPROTO_DONE;
676 }
677
678 void
udp6_ctlinput(int cmd,struct sockaddr * sa,void * d,__unused struct ifnet * ifp)679 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d, __unused struct ifnet *ifp)
680 {
681 struct udphdr uh;
682 struct ip6_hdr *ip6;
683 struct mbuf *m;
684 int off = 0;
685 struct ip6ctlparam *__single ip6cp = NULL;
686 struct icmp6_hdr *__single icmp6 = NULL;
687 const struct sockaddr_in6 *__single sa6_src = NULL;
688 void *__single cmdarg = NULL;
689 void (*notify)(struct inpcb *, int) = udp_notify;
690 struct inpcb *__single in6p;
691 struct udp_portonly {
692 u_int16_t uh_sport;
693 u_int16_t uh_dport;
694 } *uhp;
695
696 if (sa->sa_family != AF_INET6 ||
697 sa->sa_len != sizeof(struct sockaddr_in6)) {
698 return;
699 }
700
701 if ((unsigned)cmd >= PRC_NCMDS) {
702 return;
703 }
704 if (PRC_IS_REDIRECT(cmd)) {
705 notify = in6_rtchange;
706 d = NULL;
707 } else if (cmd == PRC_HOSTDEAD) {
708 d = NULL;
709 } else if (inet6ctlerrmap[cmd] == 0) {
710 return;
711 }
712
713 /* if the parameter is from icmp6, decode it. */
714 if (d != NULL) {
715 ip6cp = (struct ip6ctlparam *)d;
716 icmp6 = ip6cp->ip6c_icmp6;
717 m = ip6cp->ip6c_m;
718 ip6 = ip6cp->ip6c_ip6;
719 off = ip6cp->ip6c_off;
720 cmdarg = ip6cp->ip6c_cmdarg;
721 sa6_src = ip6cp->ip6c_src;
722 } else {
723 m = NULL;
724 ip6 = NULL;
725 cmdarg = NULL;
726 sa6_src = &sa6_any;
727 }
728
729 if (ip6 != NULL) {
730 #if SKYWALK
731 union sockaddr_in_4_6 sock_laddr;
732 struct protoctl_ev_val prctl_ev_val;
733 #endif /* SKYWALK */
734 /*
735 * XXX: We assume that when IPV6 is non NULL,
736 * M and OFF are valid.
737 */
738 /* check if we can safely examine src and dst ports */
739 if (m->m_pkthdr.len < off + sizeof(*uhp)) {
740 return;
741 }
742
743 bzero(&uh, sizeof(uh));
744 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
745
746 in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_dst, uh.uh_dport, ip6_input_getdstifscope(m),
747 &ip6->ip6_src, uh.uh_sport, ip6_input_getsrcifscope(m), 0, NULL);
748 if (cmd == PRC_MSGSIZE && in6p != NULL && !uuid_is_null(in6p->necp_client_uuid)) {
749 uuid_t null_uuid;
750 uuid_clear(null_uuid);
751 necp_update_flow_protoctl_event(null_uuid, in6p->necp_client_uuid,
752 PRC_MSGSIZE, ntohl(icmp6->icmp6_mtu), 0);
753 /*
754 * Avoid setting so_error when using Network.framework
755 * since the notification of PRC_MSGSIZE has been delivered
756 * through NECP.
757 */
758 in6_pcbnotify(&udbinfo, sa, uh.uh_dport,
759 SA(ip6cp->ip6c_src), uh.uh_sport,
760 cmd, cmdarg, NULL);
761 } else {
762 in6_pcbnotify(&udbinfo, sa, uh.uh_dport,
763 SA(ip6cp->ip6c_src), uh.uh_sport,
764 cmd, cmdarg, notify);
765 }
766 #if SKYWALK
767 bzero(&prctl_ev_val, sizeof(prctl_ev_val));
768 bzero(&sock_laddr, sizeof(sock_laddr));
769
770 if (cmd == PRC_MSGSIZE && icmp6 != NULL) {
771 prctl_ev_val.val = ntohl(icmp6->icmp6_mtu);
772 }
773 sock_laddr.sin6.sin6_family = AF_INET6;
774 sock_laddr.sin6.sin6_len = sizeof(sock_laddr.sin6);
775 sock_laddr.sin6.sin6_addr = ip6->ip6_src;
776
777 protoctl_event_enqueue_nwk_wq_entry(ifp,
778 SA(&sock_laddr), sa,
779 uh.uh_sport, uh.uh_dport, IPPROTO_UDP,
780 cmd, &prctl_ev_val);
781 #endif /* SKYWALK */
782 }
783 /*
784 * XXX The else condition here was broken for a long time.
785 * Fixing it made us deliver notification correctly but broke
786 * some frameworks that didn't handle it well.
787 * For now we have removed it and will revisit it later.
788 */
789 }
790
791 static int
udp6_abort(struct socket * so)792 udp6_abort(struct socket *so)
793 {
794 struct inpcb *__single inp;
795
796 inp = sotoinpcb(so);
797 if (inp == NULL) {
798 panic("%s: so=%p null inp", __func__, so);
799 /* NOTREACHED */
800 }
801 soisdisconnected(so);
802 in6_pcbdetach(inp);
803 return 0;
804 }
805
806 static int
udp6_attach(struct socket * so,int proto,struct proc * p)807 udp6_attach(struct socket *so, int proto, struct proc *p)
808 {
809 #pragma unused(proto)
810 struct inpcb *__single inp;
811 int error;
812
813 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
814 error = soreserve(so, udp_sendspace, udp_recvspace);
815 if (error) {
816 return error;
817 }
818 }
819
820 inp = sotoinpcb(so);
821 if (inp != NULL) {
822 return EINVAL;
823 }
824
825 error = in_pcballoc(so, &udbinfo, p);
826 if (error) {
827 return error;
828 }
829
830 inp = (struct inpcb *)so->so_pcb;
831 inp->inp_vflag |= INP_IPV6;
832 if (ip6_mapped_addr_on) {
833 inp->inp_vflag |= INP_IPV4;
834 }
835 inp->in6p_hops = -1; /* use kernel default */
836 inp->in6p_cksum = -1; /* just to be sure */
837 /*
838 * XXX: ugly!!
839 * IPv4 TTL initialization is necessary for an IPv6 socket as well,
840 * because the socket may be bound to an IPv6 wildcard address,
841 * which may match an IPv4-mapped IPv6 address.
842 */
843 inp->inp_ip_ttl = (u_char)ip_defttl;
844 if (nstat_collect) {
845 nstat_udp_new_pcb(inp);
846 }
847 return 0;
848 }
849
850 static int
udp6_bind(struct socket * so,struct sockaddr * nam,struct proc * p)851 udp6_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
852 {
853 struct inpcb *__single inp;
854 int error;
855
856 inp = sotoinpcb(so);
857 if (inp == NULL) {
858 return EINVAL;
859 }
860 /*
861 * Another thread won the binding race so do not change inp_vflag
862 */
863 if (inp->inp_flags2 & INP2_BIND_IN_PROGRESS) {
864 return EINVAL;
865 }
866
867 const uint8_t old_flags = inp->inp_vflag;
868 inp->inp_vflag &= ~INP_IPV4;
869 inp->inp_vflag |= INP_IPV6;
870
871 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
872 struct sockaddr_in6 *__single sin6_p;
873
874 sin6_p = SIN6(nam);
875
876 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
877 inp->inp_vflag |= INP_IPV4;
878 inp->inp_vflag &= ~INP_V4MAPPEDV6;
879 } else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
880 struct sockaddr_in sin;
881
882 in6_sin6_2_sin(&sin, sin6_p);
883 inp->inp_vflag |= INP_IPV4;
884 inp->inp_vflag &= ~INP_IPV6;
885 inp->inp_vflag |= INP_V4MAPPEDV6;
886
887 error = in_pcbbind(inp, SA(&sin), NULL, p);
888 if (error != 0) {
889 inp->inp_vflag = old_flags;
890 }
891 return error;
892 }
893 }
894
895 error = in6_pcbbind(inp, nam, NULL, p);
896 if (error != 0) {
897 inp->inp_vflag = old_flags;
898 }
899
900 UDP_LOG_BIND(inp, error);
901
902 return error;
903 }
904
905 int
udp6_connect(struct socket * so,struct sockaddr * nam,struct proc * p)906 udp6_connect(struct socket *so, struct sockaddr *nam, struct proc *p)
907 {
908 struct inpcb *__single inp;
909 int error;
910 struct sockaddr_in6 *__single sin6_p = SIN6(nam);
911
912 #if defined(NECP) && defined(FLOW_DIVERT)
913 int should_use_flow_divert = 0;
914 #endif /* defined(NECP) && defined(FLOW_DIVERT) */
915
916 inp = sotoinpcb(so);
917 if (inp == NULL) {
918 return EINVAL;
919 }
920
921 #if defined(NECP) && defined(FLOW_DIVERT)
922 should_use_flow_divert = necp_socket_should_use_flow_divert(inp);
923 #endif /* defined(NECP) && defined(FLOW_DIVERT) */
924
925 /*
926 * It is possible that the socket is bound to v4 mapped v6 address.
927 * Post that do not allow connect to a v6 endpoint.
928 */
929 if (inp->inp_vflag & INP_V4MAPPEDV6 &&
930 !IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
931 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
932 sin6_p->sin6_addr.s6_addr[10] = 0xff;
933 sin6_p->sin6_addr.s6_addr[11] = 0xff;
934 } else {
935 return EINVAL;
936 }
937 }
938
939 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
940 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
941 struct sockaddr_in sin;
942 const uint8_t old_flags = inp->inp_vflag;
943
944 if (inp->inp_faddr.s_addr != INADDR_ANY) {
945 return EISCONN;
946 }
947
948 if (!(so->so_flags1 & SOF1_CONNECT_COUNTED)) {
949 so->so_flags1 |= SOF1_CONNECT_COUNTED;
950 INC_ATOMIC_INT64_LIM(net_api_stats.nas_socket_inet_dgram_connected);
951 }
952
953 in6_sin6_2_sin(&sin, sin6_p);
954 #if defined(NECP) && defined(FLOW_DIVERT)
955 if (should_use_flow_divert) {
956 goto do_flow_divert;
957 }
958 #endif /* defined(NECP) && defined(FLOW_DIVERT) */
959 inp->inp_vflag |= INP_IPV4;
960 inp->inp_vflag &= ~INP_IPV6;
961 inp->inp_vflag |= INP_V4MAPPEDV6;
962
963 error = in_pcbconnect(inp, SA(&sin), p, IFSCOPE_NONE, NULL);
964 if (error == 0) {
965 #if NECP
966 /* Update NECP client with connected five-tuple */
967 if (!uuid_is_null(inp->necp_client_uuid)) {
968 socket_unlock(so, 0);
969 necp_client_assign_from_socket(so->last_pid, inp->necp_client_uuid, inp);
970 socket_lock(so, 0);
971 }
972 #endif /* NECP */
973 soisconnected(so);
974 } else {
975 inp->inp_vflag = old_flags;
976 }
977 UDP_LOG_CONNECT(inp, error);
978 return error;
979 }
980 }
981
982 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
983 return EISCONN;
984 }
985
986 if (!(so->so_flags1 & SOF1_CONNECT_COUNTED)) {
987 so->so_flags1 |= SOF1_CONNECT_COUNTED;
988 INC_ATOMIC_INT64_LIM(net_api_stats.nas_socket_inet6_dgram_connected);
989 }
990
991 #if defined(NECP) && defined(FLOW_DIVERT)
992 do_flow_divert:
993 if (should_use_flow_divert) {
994 error = flow_divert_pcb_init(so);
995 if (error == 0) {
996 error = flow_divert_connect_out(so, nam, p);
997 }
998 return error;
999 }
1000 #endif /* defined(NECP) && defined(FLOW_DIVERT) */
1001
1002 error = in6_pcbconnect(inp, nam, p);
1003 if (error == 0) {
1004 /* should be non mapped addr */
1005 if (ip6_mapped_addr_on ||
1006 (inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
1007 inp->inp_vflag &= ~INP_IPV4;
1008 inp->inp_vflag |= INP_IPV6;
1009 }
1010 #if NECP
1011 /* Update NECP client with connected five-tuple */
1012 if (!uuid_is_null(inp->necp_client_uuid)) {
1013 socket_unlock(so, 0);
1014 necp_client_assign_from_socket(so->last_pid, inp->necp_client_uuid, inp);
1015 socket_lock(so, 0);
1016 }
1017 #endif /* NECP */
1018 soisconnected(so);
1019 if (inp->inp_flowhash == 0) {
1020 inp_calc_flowhash(inp);
1021 ASSERT(inp->inp_flowhash != 0);
1022 }
1023 /* update flowinfo - RFC 6437 */
1024 if (inp->inp_flow == 0 &&
1025 inp->in6p_flags & IN6P_AUTOFLOWLABEL) {
1026 inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
1027 inp->inp_flow |=
1028 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
1029 }
1030 inp->inp_connect_timestamp = mach_continuous_time();
1031 }
1032 UDP_LOG_CONNECT(inp, error);
1033 return error;
1034 }
1035
1036 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)1037 udp6_connectx(struct socket *so, struct sockaddr *src,
1038 struct sockaddr *dst, struct proc *p, uint32_t ifscope,
1039 sae_associd_t aid, sae_connid_t *pcid, uint32_t flags, void *arg,
1040 uint32_t arglen, struct uio *uio, user_ssize_t *bytes_written)
1041 {
1042 return udp_connectx_common(so, AF_INET6, src, dst,
1043 p, ifscope, aid, pcid, flags, arg, arglen, uio, bytes_written);
1044 }
1045
1046 static int
udp6_detach(struct socket * so)1047 udp6_detach(struct socket *so)
1048 {
1049 struct inpcb *__single inp;
1050
1051 inp = sotoinpcb(so);
1052 if (inp == NULL) {
1053 return EINVAL;
1054 }
1055
1056 UDP_LOG_CONNECTION_SUMMARY(inp);
1057
1058 in6_pcbdetach(inp);
1059 return 0;
1060 }
1061
1062 static int
udp6_disconnect(struct socket * so)1063 udp6_disconnect(struct socket *so)
1064 {
1065 struct inpcb *__single inp;
1066
1067 inp = sotoinpcb(so);
1068 if (inp == NULL
1069 #if NECP
1070 || (necp_socket_should_use_flow_divert(inp))
1071 #endif /* NECP */
1072 ) {
1073 return inp == NULL ? EINVAL : EPROTOTYPE;
1074 }
1075
1076 if (inp->inp_vflag & INP_IPV4) {
1077 struct pr_usrreqs *__single pru;
1078
1079 pru = ip_protox[IPPROTO_UDP]->pr_usrreqs;
1080 return (*pru->pru_disconnect)(so);
1081 }
1082
1083 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1084 return ENOTCONN;
1085 }
1086
1087 UDP_LOG_CONNECTION_SUMMARY(inp);
1088
1089 in6_pcbdisconnect(inp);
1090
1091 /* reset flow-controlled state, just in case */
1092 inp_reset_fc_state(inp);
1093
1094 inp->in6p_laddr = in6addr_any;
1095 inp->inp_lifscope = IFSCOPE_NONE;
1096 inp->in6p_last_outifp = NULL;
1097 #if SKYWALK
1098 if (NETNS_TOKEN_VALID(&inp->inp_netns_token)) {
1099 netns_set_ifnet(&inp->inp_netns_token, NULL);
1100 }
1101 #endif /* SKYWALK */
1102
1103 so->so_state &= ~SS_ISCONNECTED; /* XXX */
1104 return 0;
1105 }
1106
1107 static int
udp6_disconnectx(struct socket * so,sae_associd_t aid,sae_connid_t cid)1108 udp6_disconnectx(struct socket *so, sae_associd_t aid, sae_connid_t cid)
1109 {
1110 #pragma unused(cid)
1111 if (aid != SAE_ASSOCID_ANY && aid != SAE_ASSOCID_ALL) {
1112 return EINVAL;
1113 }
1114
1115 return udp6_disconnect(so);
1116 }
1117
1118 static int
udp6_send(struct socket * so,int flags,struct mbuf * m,struct sockaddr * addr,struct mbuf * control,struct proc * p)1119 udp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
1120 struct mbuf *control, struct proc *p)
1121 {
1122 struct inpcb *__single inp;
1123 int error = 0;
1124 #if defined(NECP) && defined(FLOW_DIVERT)
1125 int should_use_flow_divert = 0;
1126 #endif /* defined(NECP) && defined(FLOW_DIVERT) */
1127 #if CONTENT_FILTER
1128 struct m_tag *__single cfil_tag = NULL;
1129 struct sockaddr *__single cfil_faddr = NULL;
1130 #endif
1131
1132 inp = sotoinpcb(so);
1133 if (inp == NULL) {
1134 error = EINVAL;
1135 goto bad;
1136 }
1137
1138 #if CONTENT_FILTER
1139 /* If socket is subject to UDP Content Filter and unconnected, get addr from tag. */
1140 if (CFIL_DGRAM_FILTERED(so) && !addr && IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1141 cfil_tag = cfil_dgram_get_socket_state(m, NULL, NULL, &cfil_faddr, NULL);
1142 if (cfil_tag) {
1143 addr = SA(cfil_faddr);
1144 }
1145 }
1146 #endif
1147
1148 #if defined(NECP) && defined(FLOW_DIVERT)
1149 should_use_flow_divert = necp_socket_should_use_flow_divert(inp);
1150 #endif /* defined(NECP) && defined(FLOW_DIVERT) */
1151
1152 if (addr != NULL) {
1153 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
1154 error = EINVAL;
1155 goto bad;
1156 }
1157 if (addr->sa_family != AF_INET6) {
1158 error = EAFNOSUPPORT;
1159 goto bad;
1160 }
1161 }
1162
1163 if (ip6_mapped_addr_on || (inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
1164 int hasv4addr;
1165 struct sockaddr_in6 *__single sin6 = NULL;
1166
1167 if (addr == NULL) {
1168 hasv4addr = (inp->inp_vflag & INP_IPV4);
1169 } else {
1170 sin6 = SIN6(addr);
1171 hasv4addr =
1172 IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) ? 1 : 0;
1173 }
1174 if (hasv4addr) {
1175 struct pr_usrreqs *__single pru;
1176
1177 if (sin6 != NULL) {
1178 in6_sin6_2_sin_in_sock(addr);
1179 }
1180 #if defined(NECP) && defined(FLOW_DIVERT)
1181 if (should_use_flow_divert) {
1182 goto do_flow_divert;
1183 }
1184 #endif /* defined(NECP) && defined(FLOW_DIVERT) */
1185 pru = ip_protox[IPPROTO_UDP]->pr_usrreqs;
1186 error = ((*pru->pru_send)(so, flags, m, addr,
1187 control, p));
1188 #if CONTENT_FILTER
1189 if (cfil_tag) {
1190 m_tag_free(cfil_tag);
1191 }
1192 #endif
1193 /* addr will just be freed in sendit(). */
1194 return error;
1195 }
1196 }
1197
1198 #if defined(NECP) && defined(FLOW_DIVERT)
1199 do_flow_divert:
1200 if (should_use_flow_divert) {
1201 /* Implicit connect */
1202 error = flow_divert_implicit_data_out(so, flags, m, addr, control, p);
1203 #if CONTENT_FILTER
1204 if (cfil_tag) {
1205 m_tag_free(cfil_tag);
1206 }
1207 #endif
1208 return error;
1209 }
1210 #endif /* defined(NECP) && defined(FLOW_DIVERT) */
1211
1212 so_update_tx_data_stats(so, 1, m->m_pkthdr.len);
1213
1214 #if SKYWALK
1215 sk_protect_t __single protect = sk_async_transmit_protect();
1216 #endif /* SKYWALK */
1217 error = udp6_output(inp, m, addr, control, p);
1218 #if SKYWALK
1219 sk_async_transmit_unprotect(protect);
1220 #endif /* SKYWALK */
1221
1222 #if CONTENT_FILTER
1223 if (cfil_tag) {
1224 m_tag_free(cfil_tag);
1225 }
1226 #endif
1227 return error;
1228
1229 bad:
1230 VERIFY(error != 0);
1231
1232 if (m != NULL) {
1233 m_freem(m);
1234 }
1235 if (control != NULL) {
1236 m_freem(control);
1237 }
1238 #if CONTENT_FILTER
1239 if (cfil_tag) {
1240 m_tag_free(cfil_tag);
1241 }
1242 #endif
1243 return error;
1244 }
1245
1246 /*
1247 * Checksum extended UDP header and data.
1248 */
1249 static int
udp6_input_checksum(struct mbuf * m,struct udphdr * uh,int off,int ulen)1250 udp6_input_checksum(struct mbuf *m, struct udphdr *uh, int off, int ulen)
1251 {
1252 struct ifnet *__single ifp = m->m_pkthdr.rcvif;
1253 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1254
1255 if (!(m->m_pkthdr.csum_flags & CSUM_DATA_VALID) &&
1256 uh->uh_sum == 0) {
1257 /* UDP/IPv6 checksum is mandatory (RFC2460) */
1258
1259 /*
1260 * If checksum was already validated, ignore this check.
1261 * This is necessary for transport-mode ESP, which may be
1262 * getting UDP payloads without checksums when the network
1263 * has a NAT64.
1264 */
1265 udpstat.udps_nosum++;
1266 goto badsum;
1267 }
1268
1269 if ((hwcksum_rx || (ifp->if_flags & IFF_LOOPBACK) ||
1270 (m->m_pkthdr.pkt_flags & PKTF_LOOP)) &&
1271 (m->m_pkthdr.csum_flags & CSUM_DATA_VALID)) {
1272 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
1273 uh->uh_sum = m->m_pkthdr.csum_rx_val;
1274 } else {
1275 uint32_t sum = m->m_pkthdr.csum_rx_val;
1276 uint32_t start = m->m_pkthdr.csum_rx_start;
1277 int32_t trailer = (m_pktlen(m) - (off + ulen));
1278
1279 /*
1280 * Perform 1's complement adjustment of octets
1281 * that got included/excluded in the hardware-
1282 * calculated checksum value. Also take care
1283 * of any trailing bytes and subtract out
1284 * their partial sum.
1285 */
1286 ASSERT(trailer >= 0);
1287 if ((m->m_pkthdr.csum_flags & CSUM_PARTIAL) &&
1288 (start != off || trailer != 0)) {
1289 uint32_t swbytes = (uint32_t)trailer;
1290 uint16_t s = 0, d = 0;
1291
1292 if (IN6_IS_SCOPE_EMBED(&ip6->ip6_src)) {
1293 s = ip6->ip6_src.s6_addr16[1];
1294 ip6->ip6_src.s6_addr16[1] = 0;
1295 }
1296 if (IN6_IS_SCOPE_EMBED(&ip6->ip6_dst)) {
1297 d = ip6->ip6_dst.s6_addr16[1];
1298 ip6->ip6_dst.s6_addr16[1] = 0;
1299 }
1300
1301 /* callee folds in sum */
1302 sum = m_adj_sum16(m, start, off, ulen, sum);
1303 if (off > start) {
1304 swbytes += (off - start);
1305 } else {
1306 swbytes += (start - off);
1307 }
1308
1309 if (IN6_IS_SCOPE_EMBED(&ip6->ip6_src)) {
1310 ip6->ip6_src.s6_addr16[1] = s;
1311 }
1312 if (IN6_IS_SCOPE_EMBED(&ip6->ip6_dst)) {
1313 ip6->ip6_dst.s6_addr16[1] = d;
1314 }
1315
1316 if (swbytes != 0) {
1317 udp_in_cksum_stats(swbytes);
1318 }
1319 if (trailer != 0) {
1320 m_adj(m, -trailer);
1321 }
1322 }
1323
1324 uh->uh_sum = in6_pseudo(&ip6->ip6_src, &ip6->ip6_dst,
1325 sum + htonl(ulen + IPPROTO_UDP));
1326 }
1327 uh->uh_sum ^= 0xffff;
1328 } else {
1329 udp_in6_cksum_stats(ulen);
1330 uh->uh_sum = in6_cksum(m, IPPROTO_UDP, off, ulen);
1331 }
1332
1333 if (uh->uh_sum != 0) {
1334 badsum:
1335 udpstat.udps_badsum++;
1336 IF_UDP_STATINC(ifp, badchksum);
1337 return -1;
1338 }
1339
1340 return 0;
1341 }
1342
1343 int
udp6_defunct(struct socket * so)1344 udp6_defunct(struct socket *so)
1345 {
1346 struct ip_moptions *__single imo;
1347 struct ip6_moptions *__single im6o;
1348 struct inpcb *__single inp;
1349
1350 inp = sotoinpcb(so);
1351 if (inp == NULL) {
1352 return EINVAL;
1353 }
1354
1355 im6o = inp->in6p_moptions;
1356 inp->in6p_moptions = NULL;
1357 if (im6o != NULL) {
1358 struct proc *p = current_proc();
1359
1360 SODEFUNCTLOG("%s[%d, %s]: defuncting so 0x%llu drop ipv6 multicast memberships",
1361 __func__, proc_pid(p), proc_best_name(p),
1362 so->so_gencnt);
1363 IM6O_REMREF(im6o);
1364 }
1365 imo = inp->inp_moptions;
1366 if (imo != NULL) {
1367 struct proc *__single p = current_proc();
1368
1369 SODEFUNCTLOG("%s[%d, %s]: defuncting so 0x%llu drop ipv4 multicast memberships",
1370 __func__, proc_pid(p), proc_best_name(p),
1371 so->so_gencnt);
1372
1373 inp->inp_moptions = NULL;
1374
1375 IMO_REMREF(imo);
1376 }
1377
1378 return 0;
1379 }
1380