1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * Copyright (c) 2010-2011 Juniper Networks, Inc.
6 * Copyright (c) 2014 Kevin Lo
7 * All rights reserved.
8 *
9 * Portions of this software were developed by Robert N. M. Watson under
10 * contract to Juniper Networks, Inc.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the project nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $
37 * $KAME: udp6_output.c,v 1.31 2001/05/21 16:39:15 jinmei Exp $
38 */
39
40 /*-
41 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
42 * The Regents of the University of California.
43 * All rights reserved.
44 *
45 * Redistribution and use in source and binary forms, with or without
46 * modification, are permitted provided that the following conditions
47 * are met:
48 * 1. Redistributions of source code must retain the above copyright
49 * notice, this list of conditions and the following disclaimer.
50 * 2. Redistributions in binary form must reproduce the above copyright
51 * notice, this list of conditions and the following disclaimer in the
52 * documentation and/or other materials provided with the distribution.
53 * 3. Neither the name of the University nor the names of its contributors
54 * may be used to endorse or promote products derived from this software
55 * without specific prior written permission.
56 *
57 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
58 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
59 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
60 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
61 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
62 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
63 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
64 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
65 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
66 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
67 * SUCH DAMAGE.
68 */
69
70 #include <sys/cdefs.h>
71 #include "opt_inet.h"
72 #include "opt_inet6.h"
73 #include "opt_ipsec.h"
74 #include "opt_route.h"
75 #include "opt_rss.h"
76
77 #include <sys/param.h>
78 #include <sys/domain.h>
79 #include <sys/jail.h>
80 #include <sys/kernel.h>
81 #include <sys/lock.h>
82 #include <sys/mbuf.h>
83 #include <sys/priv.h>
84 #include <sys/proc.h>
85 #include <sys/protosw.h>
86 #include <sys/sdt.h>
87 #include <sys/signalvar.h>
88 #include <sys/socket.h>
89 #include <sys/socketvar.h>
90 #include <sys/sx.h>
91 #include <sys/sysctl.h>
92 #include <sys/syslog.h>
93 #include <sys/systm.h>
94
95 #include <net/if.h>
96 #include <net/if_var.h>
97 #include <net/if_types.h>
98 #include <net/route.h>
99 #include <net/rss_config.h>
100
101 #include <netinet/in.h>
102 #include <netinet/in_kdtrace.h>
103 #include <netinet/in_pcb.h>
104 #include <netinet/in_systm.h>
105 #include <netinet/in_var.h>
106 #include <netinet/ip.h>
107 #include <netinet/ip6.h>
108 #include <netinet/icmp6.h>
109 #include <netinet/ip_var.h>
110 #include <netinet/udp.h>
111 #include <netinet/udp_var.h>
112 #include <netinet/udplite.h>
113
114 #include <netinet6/ip6_var.h>
115 #include <netinet6/in6_fib.h>
116 #include <netinet6/in6_pcb.h>
117 #include <netinet6/in6_rss.h>
118 #include <netinet6/udp6_var.h>
119 #include <netinet6/scope6_var.h>
120
121 #include <netipsec/ipsec_support.h>
122
123 #include <security/mac/mac_framework.h>
124
125 VNET_DEFINE(int, zero_checksum_port) = 0;
126 #define V_zero_checksum_port VNET(zero_checksum_port)
127 SYSCTL_INT(_net_inet6_udp6, OID_AUTO, rfc6935_port, CTLFLAG_VNET | CTLFLAG_RW,
128 &VNET_NAME(zero_checksum_port), 0,
129 "Zero UDP checksum allowed for traffic to/from this port.");
130
131 /*
132 * UDP protocol implementation.
133 * Per RFC 768, August, 1980.
134 */
135
136 static void udp6_detach(struct socket *so);
137
138 static int
udp6_append(struct inpcb * inp,struct mbuf * n,int off,struct sockaddr_in6 * fromsa)139 udp6_append(struct inpcb *inp, struct mbuf *n, int off,
140 struct sockaddr_in6 *fromsa)
141 {
142 struct socket *so;
143 struct mbuf *opts = NULL, *tmp_opts;
144 struct udpcb *up;
145 bool filtered;
146
147 INP_LOCK_ASSERT(inp);
148
149 /*
150 * Engage the tunneling protocol.
151 */
152 up = intoudpcb(inp);
153 if (up->u_tun_func != NULL) {
154 in_pcbref(inp);
155 INP_RUNLOCK(inp);
156 filtered = (*up->u_tun_func)(n, off, inp,
157 (struct sockaddr *)&fromsa[0], up->u_tun_ctx);
158 INP_RLOCK(inp);
159 if (filtered)
160 return (in_pcbrele_rlocked(inp));
161 }
162
163 off += sizeof(struct udphdr);
164
165 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
166 /* Check AH/ESP integrity. */
167 if (IPSEC_ENABLED(ipv6)) {
168 if (IPSEC_CHECK_POLICY(ipv6, n, inp) != 0) {
169 m_freem(n);
170 return (0);
171 }
172
173 /* IPSec UDP encaps. */
174 if ((up->u_flags & UF_ESPINUDP) != 0 &&
175 UDPENCAP_INPUT(ipv6, n, off, AF_INET6) != 0) {
176 return (0); /* Consumed. */
177 }
178 }
179 #endif /* IPSEC */
180 #ifdef MAC
181 if (mac_inpcb_check_deliver(inp, n) != 0) {
182 m_freem(n);
183 return (0);
184 }
185 #endif
186 opts = NULL;
187 if (inp->inp_flags & INP_CONTROLOPTS ||
188 inp->inp_socket->so_options & SO_TIMESTAMP)
189 ip6_savecontrol(inp, n, &opts);
190 if ((inp->inp_vflag & INP_IPV6) && (inp->inp_flags2 & INP_ORIGDSTADDR)) {
191 tmp_opts = sbcreatecontrol(&fromsa[1],
192 sizeof(struct sockaddr_in6), IPV6_ORIGDSTADDR,
193 IPPROTO_IPV6, M_NOWAIT);
194 if (tmp_opts) {
195 if (opts) {
196 tmp_opts->m_next = opts;
197 opts = tmp_opts;
198 } else
199 opts = tmp_opts;
200 }
201 }
202 m_adj(n, off);
203
204 so = inp->inp_socket;
205 SOCKBUF_LOCK(&so->so_rcv);
206 if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)&fromsa[0], n,
207 opts) == 0) {
208 soroverflow_locked(so);
209 m_freem(n);
210 if (opts)
211 m_freem(opts);
212 UDPSTAT_INC(udps_fullsock);
213 } else
214 sorwakeup_locked(so);
215 return (0);
216 }
217
218 struct udp6_multi_match_ctx {
219 struct ip6_hdr *ip6;
220 struct udphdr *uh;
221 };
222
223 static bool
udp6_multi_match(const struct inpcb * inp,void * v)224 udp6_multi_match(const struct inpcb *inp, void *v)
225 {
226 struct udp6_multi_match_ctx *ctx = v;
227
228 if ((inp->inp_vflag & INP_IPV6) == 0)
229 return(false);
230 if (inp->inp_lport != ctx->uh->uh_dport)
231 return(false);
232 if (inp->inp_fport != 0 && inp->inp_fport != ctx->uh->uh_sport)
233 return(false);
234 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
235 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &ctx->ip6->ip6_dst))
236 return (false);
237 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
238 (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &ctx->ip6->ip6_src) ||
239 inp->inp_fport != ctx->uh->uh_sport))
240 return (false);
241
242 return (true);
243 }
244
245 static int
udp6_multi_input(struct mbuf * m,int off,int proto,struct sockaddr_in6 * fromsa)246 udp6_multi_input(struct mbuf *m, int off, int proto,
247 struct sockaddr_in6 *fromsa)
248 {
249 struct udp6_multi_match_ctx ctx;
250 struct inpcb_iterator inpi = INP_ITERATOR(udp_get_inpcbinfo(proto),
251 INPLOOKUP_RLOCKPCB, udp6_multi_match, &ctx);
252 struct inpcb *inp;
253 struct ip6_moptions *imo;
254 struct mbuf *n;
255 int appends = 0;
256
257 /*
258 * In the event that laddr should be set to the link-local
259 * address (this happens in RIPng), the multicast address
260 * specified in the received packet will not match laddr. To
261 * handle this situation, matching is relaxed if the
262 * receiving interface is the same as one specified in the
263 * socket and if the destination multicast address matches
264 * one of the multicast groups specified in the socket.
265 */
266
267 /*
268 * KAME note: traditionally we dropped udpiphdr from mbuf
269 * here. We need udphdr for IPsec processing so we do that
270 * later.
271 */
272 ctx.ip6 = mtod(m, struct ip6_hdr *);
273 ctx.uh = (struct udphdr *)((char *)ctx.ip6 + off);
274 while ((inp = inp_next(&inpi)) != NULL) {
275 INP_RLOCK_ASSERT(inp);
276 /*
277 * XXXRW: Because we weren't holding either the inpcb
278 * or the hash lock when we checked for a match
279 * before, we should probably recheck now that the
280 * inpcb lock is (supposed to be) held.
281 */
282 /*
283 * Handle socket delivery policy for any-source
284 * and source-specific multicast. [RFC3678]
285 */
286 if ((imo = inp->in6p_moptions) != NULL) {
287 struct sockaddr_in6 mcaddr;
288 int blocked;
289
290 bzero(&mcaddr, sizeof(struct sockaddr_in6));
291 mcaddr.sin6_len = sizeof(struct sockaddr_in6);
292 mcaddr.sin6_family = AF_INET6;
293 mcaddr.sin6_addr = ctx.ip6->ip6_dst;
294
295 blocked = im6o_mc_filter(imo, m->m_pkthdr.rcvif,
296 (struct sockaddr *)&mcaddr,
297 (struct sockaddr *)&fromsa[0]);
298 if (blocked != MCAST_PASS) {
299 if (blocked == MCAST_NOTGMEMBER)
300 IP6STAT_INC(ip6s_notmember);
301 if (blocked == MCAST_NOTSMEMBER ||
302 blocked == MCAST_MUTED)
303 UDPSTAT_INC(udps_filtermcast);
304 continue;
305 }
306 }
307 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) != NULL) {
308 if (proto == IPPROTO_UDPLITE)
309 UDPLITE_PROBE(receive, NULL, inp, ctx.ip6,
310 inp, ctx.uh);
311 else
312 UDP_PROBE(receive, NULL, inp, ctx.ip6, inp,
313 ctx.uh);
314 if (udp6_append(inp, n, off, fromsa)) {
315 break;
316 } else
317 appends++;
318 }
319 /*
320 * Don't look for additional matches if this one does
321 * not have either the SO_REUSEPORT or SO_REUSEADDR
322 * socket options set. This heuristic avoids
323 * searching through all pcbs in the common case of a
324 * non-shared port. It assumes that an application
325 * will never clear these options after setting them.
326 */
327 if ((inp->inp_socket->so_options &
328 (SO_REUSEPORT|SO_REUSEPORT_LB|SO_REUSEADDR)) == 0) {
329 INP_RUNLOCK(inp);
330 break;
331 }
332 }
333 m_freem(m);
334
335 if (appends == 0) {
336 /*
337 * No matching pcb found; discard datagram. (No need
338 * to send an ICMP Port Unreachable for a broadcast
339 * or multicast datgram.)
340 */
341 UDPSTAT_INC(udps_noport);
342 UDPSTAT_INC(udps_noportmcast);
343 }
344
345 return (IPPROTO_DONE);
346 }
347
348 int
udp6_input(struct mbuf ** mp,int * offp,int proto)349 udp6_input(struct mbuf **mp, int *offp, int proto)
350 {
351 struct mbuf *m = *mp;
352 struct ip6_hdr *ip6;
353 struct udphdr *uh;
354 struct inpcb *inp;
355 struct inpcbinfo *pcbinfo;
356 struct udpcb *up;
357 int off = *offp;
358 int cscov_partial;
359 int plen, ulen;
360 struct sockaddr_in6 fromsa[2];
361 struct m_tag *fwd_tag;
362 uint16_t uh_sum;
363 uint8_t nxt;
364
365 NET_EPOCH_ASSERT();
366
367 if (m->m_len < off + sizeof(struct udphdr)) {
368 m = m_pullup(m, off + sizeof(struct udphdr));
369 if (m == NULL) {
370 IP6STAT_INC(ip6s_exthdrtoolong);
371 *mp = NULL;
372 return (IPPROTO_DONE);
373 }
374 }
375 ip6 = mtod(m, struct ip6_hdr *);
376 uh = (struct udphdr *)((caddr_t)ip6 + off);
377
378 UDPSTAT_INC(udps_ipackets);
379
380 /*
381 * Destination port of 0 is illegal, based on RFC768.
382 */
383 if (uh->uh_dport == 0)
384 goto badunlocked;
385
386 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
387 ulen = ntohs((u_short)uh->uh_ulen);
388
389 nxt = proto;
390 cscov_partial = (nxt == IPPROTO_UDPLITE) ? 1 : 0;
391 if (nxt == IPPROTO_UDPLITE) {
392 /* Zero means checksum over the complete packet. */
393 if (ulen == 0)
394 ulen = plen;
395 if (ulen == plen)
396 cscov_partial = 0;
397 if ((ulen < sizeof(struct udphdr)) || (ulen > plen)) {
398 /* XXX: What is the right UDPLite MIB counter? */
399 goto badunlocked;
400 }
401 if (uh->uh_sum == 0) {
402 /* XXX: What is the right UDPLite MIB counter? */
403 goto badunlocked;
404 }
405 } else {
406 if ((ulen < sizeof(struct udphdr)) || (plen != ulen)) {
407 UDPSTAT_INC(udps_badlen);
408 goto badunlocked;
409 }
410 if (uh->uh_sum == 0) {
411 UDPSTAT_INC(udps_nosum);
412 /*
413 * dport 0 was rejected earlier so this is OK even if
414 * zero_checksum_port is 0 (which is its default value).
415 */
416 if (ntohs(uh->uh_dport) == V_zero_checksum_port)
417 goto skip_checksum;
418 else
419 goto badunlocked;
420 }
421 }
422
423 if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID_IPV6) &&
424 !cscov_partial) {
425 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
426 uh_sum = m->m_pkthdr.csum_data;
427 else
428 uh_sum = in6_cksum_pseudo(ip6, ulen, nxt,
429 m->m_pkthdr.csum_data);
430 uh_sum ^= 0xffff;
431 } else
432 uh_sum = in6_cksum_partial(m, nxt, off, plen, ulen);
433
434 if (uh_sum != 0) {
435 UDPSTAT_INC(udps_badsum);
436 goto badunlocked;
437 }
438
439 skip_checksum:
440 /*
441 * Construct sockaddr format source address.
442 */
443 init_sin6(&fromsa[0], m, 0);
444 fromsa[0].sin6_port = uh->uh_sport;
445 init_sin6(&fromsa[1], m, 1);
446 fromsa[1].sin6_port = uh->uh_dport;
447
448 pcbinfo = udp_get_inpcbinfo(nxt);
449 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
450 *mp = NULL;
451 return (udp6_multi_input(m, off, proto, fromsa));
452 }
453
454 /*
455 * Locate pcb for datagram.
456 */
457
458 /*
459 * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
460 */
461 if ((m->m_flags & M_IP6_NEXTHOP) &&
462 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
463 struct sockaddr_in6 *next_hop6;
464
465 next_hop6 = (struct sockaddr_in6 *)(fwd_tag + 1);
466
467 /*
468 * Transparently forwarded. Pretend to be the destination.
469 * Already got one like this?
470 */
471 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src,
472 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
473 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif, m);
474 if (!inp) {
475 /*
476 * It's new. Try to find the ambushing socket.
477 * Because we've rewritten the destination address,
478 * any hardware-generated hash is ignored.
479 */
480 inp = in6_pcblookup(pcbinfo, &ip6->ip6_src,
481 uh->uh_sport, &next_hop6->sin6_addr,
482 next_hop6->sin6_port ? htons(next_hop6->sin6_port) :
483 uh->uh_dport, INPLOOKUP_WILDCARD |
484 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif);
485 }
486 /* Remove the tag from the packet. We don't need it anymore. */
487 m_tag_delete(m, fwd_tag);
488 m->m_flags &= ~M_IP6_NEXTHOP;
489 } else
490 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src,
491 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
492 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB,
493 m->m_pkthdr.rcvif, m);
494 if (inp == NULL) {
495 if (V_udp_log_in_vain) {
496 char ip6bufs[INET6_ADDRSTRLEN];
497 char ip6bufd[INET6_ADDRSTRLEN];
498
499 log(LOG_INFO,
500 "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
501 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
502 ntohs(uh->uh_dport),
503 ip6_sprintf(ip6bufs, &ip6->ip6_src),
504 ntohs(uh->uh_sport));
505 }
506 if (nxt == IPPROTO_UDPLITE)
507 UDPLITE_PROBE(receive, NULL, NULL, ip6, NULL, uh);
508 else
509 UDP_PROBE(receive, NULL, NULL, ip6, NULL, uh);
510 UDPSTAT_INC(udps_noport);
511 if (m->m_flags & M_MCAST) {
512 printf("UDP6: M_MCAST is set in a unicast packet.\n");
513 UDPSTAT_INC(udps_noportmcast);
514 goto badunlocked;
515 }
516 if (V_udp_blackhole && (V_udp_blackhole_local ||
517 !in6_localaddr(&ip6->ip6_src)))
518 goto badunlocked;
519 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
520 *mp = NULL;
521 return (IPPROTO_DONE);
522 }
523 INP_RLOCK_ASSERT(inp);
524 up = intoudpcb(inp);
525 if (cscov_partial) {
526 if (up->u_rxcslen == 0 || up->u_rxcslen > ulen) {
527 INP_RUNLOCK(inp);
528 m_freem(m);
529 *mp = NULL;
530 return (IPPROTO_DONE);
531 }
532 }
533 if (nxt == IPPROTO_UDPLITE)
534 UDPLITE_PROBE(receive, NULL, inp, ip6, inp, uh);
535 else
536 UDP_PROBE(receive, NULL, inp, ip6, inp, uh);
537 if (udp6_append(inp, m, off, fromsa) == 0)
538 INP_RUNLOCK(inp);
539 *mp = NULL;
540 return (IPPROTO_DONE);
541
542 badunlocked:
543 m_freem(m);
544 *mp = NULL;
545 return (IPPROTO_DONE);
546 }
547
548 static void
udp6_common_ctlinput(struct ip6ctlparam * ip6cp,struct inpcbinfo * pcbinfo)549 udp6_common_ctlinput(struct ip6ctlparam *ip6cp, struct inpcbinfo *pcbinfo)
550 {
551 struct udphdr uh;
552 struct ip6_hdr *ip6;
553 struct mbuf *m;
554 struct inpcb *inp;
555 int errno, off = 0;
556 struct udp_portonly {
557 u_int16_t uh_sport;
558 u_int16_t uh_dport;
559 } *uhp;
560
561 if ((errno = icmp6_errmap(ip6cp->ip6c_icmp6)) == 0)
562 return;
563
564 m = ip6cp->ip6c_m;
565 ip6 = ip6cp->ip6c_ip6;
566 off = ip6cp->ip6c_off;
567
568 /* Check if we can safely examine src and dst ports. */
569 if (m->m_pkthdr.len < off + sizeof(*uhp))
570 return;
571
572 bzero(&uh, sizeof(uh));
573 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
574
575 /* Check to see if its tunneled */
576 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_dst, uh.uh_dport,
577 &ip6->ip6_src, uh.uh_sport, INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB,
578 m->m_pkthdr.rcvif, m);
579 if (inp != NULL) {
580 struct udpcb *up;
581 udp_tun_icmp_t *func;
582
583 up = intoudpcb(inp);
584 func = up->u_icmp_func;
585 INP_RUNLOCK(inp);
586 if (func != NULL)
587 func(ip6cp);
588 }
589 in6_pcbnotify(pcbinfo, ip6cp->ip6c_finaldst, uh.uh_dport,
590 ip6cp->ip6c_src, uh.uh_sport, errno, ip6cp->ip6c_cmdarg,
591 udp_notify);
592 }
593
594 static void
udp6_ctlinput(struct ip6ctlparam * ctl)595 udp6_ctlinput(struct ip6ctlparam *ctl)
596 {
597
598 return (udp6_common_ctlinput(ctl, &V_udbinfo));
599 }
600
601 static void
udplite6_ctlinput(struct ip6ctlparam * ctl)602 udplite6_ctlinput(struct ip6ctlparam *ctl)
603 {
604
605 return (udp6_common_ctlinput(ctl, &V_ulitecbinfo));
606 }
607
608 static int
udp6_getcred(SYSCTL_HANDLER_ARGS)609 udp6_getcred(SYSCTL_HANDLER_ARGS)
610 {
611 struct xucred xuc;
612 struct sockaddr_in6 addrs[2];
613 struct epoch_tracker et;
614 struct inpcb *inp;
615 int error;
616
617 error = priv_check(req->td, PRIV_NETINET_GETCRED);
618 if (error)
619 return (error);
620
621 if (req->newlen != sizeof(addrs))
622 return (EINVAL);
623 if (req->oldlen != sizeof(struct xucred))
624 return (EINVAL);
625 error = SYSCTL_IN(req, addrs, sizeof(addrs));
626 if (error)
627 return (error);
628 if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 ||
629 (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) {
630 return (error);
631 }
632 NET_EPOCH_ENTER(et);
633 inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr,
634 addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port,
635 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
636 NET_EPOCH_EXIT(et);
637 if (inp != NULL) {
638 INP_RLOCK_ASSERT(inp);
639 if (inp->inp_socket == NULL)
640 error = ENOENT;
641 if (error == 0)
642 error = cr_canseesocket(req->td->td_ucred,
643 inp->inp_socket);
644 if (error == 0)
645 cru2x(inp->inp_cred, &xuc);
646 INP_RUNLOCK(inp);
647 } else
648 error = ENOENT;
649 if (error == 0)
650 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
651 return (error);
652 }
653
654 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred,
655 CTLTYPE_OPAQUE | CTLFLAG_RW | CTLFLAG_MPSAFE,
656 0, 0, udp6_getcred, "S,xucred",
657 "Get the xucred of a UDP6 connection");
658
659 static int
udp6_send(struct socket * so,int flags_arg,struct mbuf * m,struct sockaddr * addr6,struct mbuf * control,struct thread * td)660 udp6_send(struct socket *so, int flags_arg, struct mbuf *m,
661 struct sockaddr *addr6, struct mbuf *control, struct thread *td)
662 {
663 struct inpcb *inp;
664 struct ip6_hdr *ip6;
665 struct udphdr *udp6;
666 struct in6_addr *laddr, *faddr, in6a;
667 struct ip6_pktopts *optp, opt;
668 struct sockaddr_in6 *sin6, tmp;
669 struct epoch_tracker et;
670 int cscov_partial, error, flags, hlen, scope_ambiguous;
671 u_int32_t ulen, plen;
672 uint16_t cscov;
673 u_short fport;
674 uint8_t nxt;
675
676 if (addr6) {
677 error = 0;
678 if (addr6->sa_family != AF_INET6)
679 error = EAFNOSUPPORT;
680 else if (addr6->sa_len != sizeof(struct sockaddr_in6))
681 error = EINVAL;
682 if (__predict_false(error != 0)) {
683 m_freem(control);
684 m_freem(m);
685 return (error);
686 }
687 }
688
689 sin6 = (struct sockaddr_in6 *)addr6;
690
691 /*
692 * In contrast to IPv4 we do not validate the max. packet length
693 * here due to IPv6 Jumbograms (RFC2675).
694 */
695
696 scope_ambiguous = 0;
697 if (sin6) {
698 /* Protect *addr6 from overwrites. */
699 tmp = *sin6;
700 sin6 = &tmp;
701
702 /*
703 * Application should provide a proper zone ID or the use of
704 * default zone IDs should be enabled. Unfortunately, some
705 * applications do not behave as it should, so we need a
706 * workaround. Even if an appropriate ID is not determined,
707 * we'll see if we can determine the outgoing interface. If we
708 * can, determine the zone ID based on the interface below.
709 */
710 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone)
711 scope_ambiguous = 1;
712 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0) {
713 if (control)
714 m_freem(control);
715 m_freem(m);
716 return (error);
717 }
718 }
719
720 inp = sotoinpcb(so);
721 KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
722 /*
723 * In the following cases we want a write lock on the inp for either
724 * local operations or for possible route cache updates in the IPv6
725 * output path:
726 * - on connected sockets (sin6 is NULL) for route cache updates,
727 * - when we are not bound to an address and source port (it is
728 * in6_pcbsetport() which will require the write lock).
729 *
730 * We check the inp fields before actually locking the inp, so
731 * here exists a race, and we may WLOCK the inp and end with already
732 * bound one by other thread. This is fine.
733 */
734 if (sin6 == NULL || (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
735 inp->inp_lport == 0))
736 INP_WLOCK(inp);
737 else
738 INP_RLOCK(inp);
739
740 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
741 IPPROTO_UDP : IPPROTO_UDPLITE;
742
743 #ifdef INET
744 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
745 int hasv4addr;
746
747 if (sin6 == NULL)
748 hasv4addr = (inp->inp_vflag & INP_IPV4);
749 else
750 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
751 ? 1 : 0;
752 if (hasv4addr) {
753 /*
754 * XXXRW: We release UDP-layer locks before calling
755 * udp_send() in order to avoid recursion. However,
756 * this does mean there is a short window where inp's
757 * fields are unstable. Could this lead to a
758 * potential race in which the factors causing us to
759 * select the UDPv4 output routine are invalidated?
760 */
761 INP_UNLOCK(inp);
762 if (sin6)
763 in6_sin6_2_sin_in_sock((struct sockaddr *)sin6);
764 /* addr will just be freed in sendit(). */
765 return (udp_send(so, flags_arg | PRUS_IPV6, m,
766 (struct sockaddr *)sin6, control, td));
767 }
768 } else
769 #endif
770 if (sin6 && IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
771 /*
772 * Given this is either an IPv6-only socket or no INET is
773 * supported we will fail the send if the given destination
774 * address is a v4mapped address.
775 */
776 INP_UNLOCK(inp);
777 m_freem(m);
778 m_freem(control);
779 return (EINVAL);
780 }
781
782 NET_EPOCH_ENTER(et);
783 if (control) {
784 if ((error = ip6_setpktopts(control, &opt,
785 inp->in6p_outputopts, td->td_ucred, nxt)) != 0) {
786 goto release;
787 }
788 optp = &opt;
789 } else
790 optp = inp->in6p_outputopts;
791
792 if (sin6) {
793 /*
794 * Since we saw no essential reason for calling in_pcbconnect,
795 * we get rid of such kind of logic, and call in6_selectsrc
796 * and in6_pcbsetport in order to fill in the local address
797 * and the local port.
798 */
799 if (sin6->sin6_port == 0) {
800 error = EADDRNOTAVAIL;
801 goto release;
802 }
803
804 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
805 /* how about ::ffff:0.0.0.0 case? */
806 error = EISCONN;
807 goto release;
808 }
809
810 /*
811 * Given we handle the v4mapped case in the INET block above
812 * assert here that it must not happen anymore.
813 */
814 KASSERT(!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr),
815 ("%s: sin6(%p)->sin6_addr is v4mapped which we "
816 "should have handled.", __func__, sin6));
817
818 /* This only requires read-locking. */
819 error = in6_selectsrc_socket(sin6, optp, inp,
820 td->td_ucred, scope_ambiguous, &in6a, NULL);
821 if (error)
822 goto release;
823 laddr = &in6a;
824
825 if (inp->inp_lport == 0) {
826 struct inpcbinfo *pcbinfo;
827
828 INP_WLOCK_ASSERT(inp);
829
830 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
831 INP_HASH_WLOCK(pcbinfo);
832 error = in6_pcbsetport(laddr, inp, td->td_ucred);
833 INP_HASH_WUNLOCK(pcbinfo);
834 if (error != 0) {
835 /* Undo an address bind that may have occurred. */
836 inp->in6p_laddr = in6addr_any;
837 goto release;
838 }
839 }
840 faddr = &sin6->sin6_addr;
841 fport = sin6->sin6_port; /* allow 0 port */
842
843 } else {
844 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
845 error = ENOTCONN;
846 goto release;
847 }
848 laddr = &inp->in6p_laddr;
849 faddr = &inp->in6p_faddr;
850 fport = inp->inp_fport;
851 }
852
853 ulen = m->m_pkthdr.len;
854 plen = sizeof(struct udphdr) + ulen;
855 hlen = sizeof(struct ip6_hdr);
856
857 /*
858 * Calculate data length and get a mbuf
859 * for UDP and IP6 headers.
860 */
861 M_PREPEND(m, hlen + sizeof(struct udphdr), M_NOWAIT);
862 if (m == NULL) {
863 error = ENOBUFS;
864 goto release;
865 }
866
867 /*
868 * Stuff checksum and output datagram.
869 */
870 cscov = cscov_partial = 0;
871 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
872 udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */
873 udp6->uh_dport = fport;
874 if (nxt == IPPROTO_UDPLITE) {
875 struct udpcb *up;
876
877 up = intoudpcb(inp);
878 cscov = up->u_txcslen;
879 if (cscov >= plen)
880 cscov = 0;
881 udp6->uh_ulen = htons(cscov);
882 /*
883 * For UDP-Lite, checksum coverage length of zero means
884 * the entire UDPLite packet is covered by the checksum.
885 */
886 cscov_partial = (cscov == 0) ? 0 : 1;
887 } else if (plen <= 0xffff)
888 udp6->uh_ulen = htons((u_short)plen);
889 else
890 udp6->uh_ulen = 0;
891 udp6->uh_sum = 0;
892
893 ip6 = mtod(m, struct ip6_hdr *);
894 ip6->ip6_flow = inp->inp_flow & IPV6_FLOWINFO_MASK;
895 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
896 ip6->ip6_vfc |= IPV6_VERSION;
897 ip6->ip6_plen = htons((u_short)plen);
898 ip6->ip6_nxt = nxt;
899 ip6->ip6_hlim = in6_selecthlim(inp, NULL);
900 ip6->ip6_src = *laddr;
901 ip6->ip6_dst = *faddr;
902
903 #ifdef MAC
904 mac_inpcb_create_mbuf(inp, m);
905 #endif
906
907 if (cscov_partial) {
908 if ((udp6->uh_sum = in6_cksum_partial(m, nxt,
909 sizeof(struct ip6_hdr), plen, cscov)) == 0)
910 udp6->uh_sum = 0xffff;
911 } else {
912 udp6->uh_sum = in6_cksum_pseudo(ip6, plen, nxt, 0);
913 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6;
914 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
915 }
916
917 flags = 0;
918 #if defined(ROUTE_MPATH) || defined(RSS)
919 if (CALC_FLOWID_OUTBOUND_SENDTO) {
920 uint32_t hash_type, hash_val;
921 uint8_t pr;
922
923 pr = inp->inp_socket->so_proto->pr_protocol;
924
925 hash_val = fib6_calc_packet_hash(laddr, faddr,
926 inp->inp_lport, fport, pr, &hash_type);
927 m->m_pkthdr.flowid = hash_val;
928 M_HASHTYPE_SET(m, hash_type);
929 }
930 /* do not use inp flowid */
931 flags |= IP_NODEFAULTFLOWID;
932 #endif
933
934 UDPSTAT_INC(udps_opackets);
935 if (nxt == IPPROTO_UDPLITE)
936 UDPLITE_PROBE(send, NULL, inp, ip6, inp, udp6);
937 else
938 UDP_PROBE(send, NULL, inp, ip6, inp, udp6);
939 error = ip6_output(m, optp,
940 INP_WLOCKED(inp) ? &inp->inp_route6 : NULL, flags,
941 inp->in6p_moptions, NULL, inp);
942 INP_UNLOCK(inp);
943 NET_EPOCH_EXIT(et);
944
945 if (control) {
946 ip6_clearpktopts(&opt, -1);
947 m_freem(control);
948 }
949 return (error);
950
951 release:
952 INP_UNLOCK(inp);
953 NET_EPOCH_EXIT(et);
954 if (control) {
955 ip6_clearpktopts(&opt, -1);
956 m_freem(control);
957 }
958 m_freem(m);
959
960 return (error);
961 }
962
963 static void
udp6_abort(struct socket * so)964 udp6_abort(struct socket *so)
965 {
966 struct inpcb *inp;
967 struct inpcbinfo *pcbinfo;
968
969 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
970 inp = sotoinpcb(so);
971 KASSERT(inp != NULL, ("udp6_abort: inp == NULL"));
972
973 INP_WLOCK(inp);
974 #ifdef INET
975 if (inp->inp_vflag & INP_IPV4) {
976 INP_WUNLOCK(inp);
977 udp_abort(so);
978 return;
979 }
980 #endif
981
982 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
983 INP_HASH_WLOCK(pcbinfo);
984 in6_pcbdisconnect(inp);
985 INP_HASH_WUNLOCK(pcbinfo);
986 soisdisconnected(so);
987 }
988 INP_WUNLOCK(inp);
989 }
990
991 static int
udp6_attach(struct socket * so,int proto,struct thread * td)992 udp6_attach(struct socket *so, int proto, struct thread *td)
993 {
994 struct inpcbinfo *pcbinfo;
995 struct inpcb *inp;
996 struct udpcb *up;
997 int error;
998
999 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1000 inp = sotoinpcb(so);
1001 KASSERT(inp == NULL, ("udp6_attach: inp != NULL"));
1002
1003 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1004 error = soreserve(so, udp_sendspace, udp_recvspace);
1005 if (error)
1006 return (error);
1007 }
1008 error = in_pcballoc(so, pcbinfo);
1009 if (error)
1010 return (error);
1011 inp = (struct inpcb *)so->so_pcb;
1012 inp->in6p_cksum = -1; /* just to be sure */
1013 /*
1014 * XXX: ugly!!
1015 * IPv4 TTL initialization is necessary for an IPv6 socket as well,
1016 * because the socket may be bound to an IPv6 wildcard address,
1017 * which may match an IPv4-mapped IPv6 address.
1018 */
1019 inp->inp_ip_ttl = V_ip_defttl;
1020 up = intoudpcb(inp);
1021 bzero(&up->u_start_zero, u_zero_size);
1022 INP_WUNLOCK(inp);
1023 return (0);
1024 }
1025
1026 static int
udp6_bind(struct socket * so,struct sockaddr * nam,struct thread * td)1027 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
1028 {
1029 struct sockaddr_in6 *sin6_p;
1030 struct inpcb *inp;
1031 struct inpcbinfo *pcbinfo;
1032 int error;
1033 u_char vflagsav;
1034
1035 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1036 inp = sotoinpcb(so);
1037 KASSERT(inp != NULL, ("udp6_bind: inp == NULL"));
1038
1039 if (nam->sa_family != AF_INET6)
1040 return (EAFNOSUPPORT);
1041 if (nam->sa_len != sizeof(struct sockaddr_in6))
1042 return (EINVAL);
1043
1044 sin6_p = (struct sockaddr_in6 *)nam;
1045
1046 INP_WLOCK(inp);
1047 INP_HASH_WLOCK(pcbinfo);
1048 vflagsav = inp->inp_vflag;
1049 inp->inp_vflag &= ~INP_IPV4;
1050 inp->inp_vflag |= INP_IPV6;
1051 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
1052 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
1053 inp->inp_vflag |= INP_IPV4;
1054 #ifdef INET
1055 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
1056 struct sockaddr_in sin;
1057
1058 in6_sin6_2_sin(&sin, sin6_p);
1059 inp->inp_vflag |= INP_IPV4;
1060 inp->inp_vflag &= ~INP_IPV6;
1061 error = in_pcbbind(inp, &sin, td->td_ucred);
1062 goto out;
1063 }
1064 #endif
1065 }
1066
1067 error = in6_pcbbind(inp, sin6_p, td->td_ucred);
1068 #ifdef INET
1069 out:
1070 #endif
1071 if (error != 0)
1072 inp->inp_vflag = vflagsav;
1073 INP_HASH_WUNLOCK(pcbinfo);
1074 INP_WUNLOCK(inp);
1075 return (error);
1076 }
1077
1078 static void
udp6_close(struct socket * so)1079 udp6_close(struct socket *so)
1080 {
1081 struct inpcb *inp;
1082 struct inpcbinfo *pcbinfo;
1083
1084 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1085 inp = sotoinpcb(so);
1086 KASSERT(inp != NULL, ("udp6_close: inp == NULL"));
1087
1088 INP_WLOCK(inp);
1089 #ifdef INET
1090 if (inp->inp_vflag & INP_IPV4) {
1091 INP_WUNLOCK(inp);
1092 (void)udp_disconnect(so);
1093 return;
1094 }
1095 #endif
1096 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1097 INP_HASH_WLOCK(pcbinfo);
1098 in6_pcbdisconnect(inp);
1099 INP_HASH_WUNLOCK(pcbinfo);
1100 soisdisconnected(so);
1101 }
1102 INP_WUNLOCK(inp);
1103 }
1104
1105 static int
udp6_connect(struct socket * so,struct sockaddr * nam,struct thread * td)1106 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1107 {
1108 struct epoch_tracker et;
1109 struct inpcb *inp;
1110 struct inpcbinfo *pcbinfo;
1111 struct sockaddr_in6 *sin6;
1112 int error;
1113 u_char vflagsav;
1114
1115 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1116 inp = sotoinpcb(so);
1117 KASSERT(inp != NULL, ("udp6_connect: inp == NULL"));
1118
1119 sin6 = (struct sockaddr_in6 *)nam;
1120 if (sin6->sin6_family != AF_INET6)
1121 return (EAFNOSUPPORT);
1122 if (sin6->sin6_len != sizeof(*sin6))
1123 return (EINVAL);
1124
1125 /*
1126 * XXXRW: Need to clarify locking of v4/v6 flags.
1127 */
1128 INP_WLOCK(inp);
1129 #ifdef INET
1130 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
1131 struct sockaddr_in sin;
1132
1133 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
1134 error = EINVAL;
1135 goto out;
1136 }
1137 if ((inp->inp_vflag & INP_IPV4) == 0) {
1138 error = EAFNOSUPPORT;
1139 goto out;
1140 }
1141 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1142 error = EISCONN;
1143 goto out;
1144 }
1145 in6_sin6_2_sin(&sin, sin6);
1146 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr);
1147 if (error != 0)
1148 goto out;
1149 vflagsav = inp->inp_vflag;
1150 inp->inp_vflag |= INP_IPV4;
1151 inp->inp_vflag &= ~INP_IPV6;
1152 NET_EPOCH_ENTER(et);
1153 INP_HASH_WLOCK(pcbinfo);
1154 error = in_pcbconnect(inp, &sin, td->td_ucred, true);
1155 INP_HASH_WUNLOCK(pcbinfo);
1156 NET_EPOCH_EXIT(et);
1157 /*
1158 * If connect succeeds, mark socket as connected. If
1159 * connect fails and socket is unbound, reset inp_vflag
1160 * field.
1161 */
1162 if (error == 0)
1163 soisconnected(so);
1164 else if (inp->inp_laddr.s_addr == INADDR_ANY &&
1165 inp->inp_lport == 0)
1166 inp->inp_vflag = vflagsav;
1167 goto out;
1168 } else {
1169 if ((inp->inp_vflag & INP_IPV6) == 0) {
1170 error = EAFNOSUPPORT;
1171 goto out;
1172 }
1173 }
1174 #endif
1175 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1176 error = EISCONN;
1177 goto out;
1178 }
1179 error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr);
1180 if (error != 0)
1181 goto out;
1182 vflagsav = inp->inp_vflag;
1183 inp->inp_vflag &= ~INP_IPV4;
1184 inp->inp_vflag |= INP_IPV6;
1185 NET_EPOCH_ENTER(et);
1186 INP_HASH_WLOCK(pcbinfo);
1187 error = in6_pcbconnect(inp, sin6, td->td_ucred, true);
1188 INP_HASH_WUNLOCK(pcbinfo);
1189 NET_EPOCH_EXIT(et);
1190 /*
1191 * If connect succeeds, mark socket as connected. If
1192 * connect fails and socket is unbound, reset inp_vflag
1193 * field.
1194 */
1195 if (error == 0)
1196 soisconnected(so);
1197 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
1198 inp->inp_lport == 0)
1199 inp->inp_vflag = vflagsav;
1200 out:
1201 INP_WUNLOCK(inp);
1202 return (error);
1203 }
1204
1205 static void
udp6_detach(struct socket * so)1206 udp6_detach(struct socket *so)
1207 {
1208 struct inpcb *inp;
1209
1210 inp = sotoinpcb(so);
1211 KASSERT(inp != NULL, ("udp6_detach: inp == NULL"));
1212
1213 INP_WLOCK(inp);
1214 in_pcbfree(inp);
1215 }
1216
1217 static int
udp6_disconnect(struct socket * so)1218 udp6_disconnect(struct socket *so)
1219 {
1220 struct inpcb *inp;
1221 struct inpcbinfo *pcbinfo;
1222
1223 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1224 inp = sotoinpcb(so);
1225 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL"));
1226
1227 INP_WLOCK(inp);
1228 #ifdef INET
1229 if (inp->inp_vflag & INP_IPV4) {
1230 INP_WUNLOCK(inp);
1231 (void)udp_disconnect(so);
1232 return (0);
1233 }
1234 #endif
1235
1236 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1237 INP_WUNLOCK(inp);
1238 return (ENOTCONN);
1239 }
1240
1241 INP_HASH_WLOCK(pcbinfo);
1242 in6_pcbdisconnect(inp);
1243 INP_HASH_WUNLOCK(pcbinfo);
1244 SOCK_LOCK(so);
1245 so->so_state &= ~SS_ISCONNECTED; /* XXX */
1246 SOCK_UNLOCK(so);
1247 INP_WUNLOCK(inp);
1248 return (0);
1249 }
1250
1251 #define UDP6_PROTOSW \
1252 .pr_type = SOCK_DGRAM, \
1253 .pr_flags = PR_ATOMIC|PR_ADDR|PR_CAPATTACH, \
1254 .pr_ctloutput = udp_ctloutput, \
1255 .pr_abort = udp6_abort, \
1256 .pr_attach = udp6_attach, \
1257 .pr_bind = udp6_bind, \
1258 .pr_connect = udp6_connect, \
1259 .pr_control = in6_control, \
1260 .pr_detach = udp6_detach, \
1261 .pr_disconnect = udp6_disconnect, \
1262 .pr_peeraddr = in6_mapped_peeraddr, \
1263 .pr_send = udp6_send, \
1264 .pr_shutdown = udp_shutdown, \
1265 .pr_sockaddr = in6_mapped_sockaddr, \
1266 .pr_soreceive = soreceive_dgram, \
1267 .pr_sosend = sosend_dgram, \
1268 .pr_sosetlabel = in_pcbsosetlabel, \
1269 .pr_close = udp6_close
1270
1271 struct protosw udp6_protosw = {
1272 .pr_protocol = IPPROTO_UDP,
1273 UDP6_PROTOSW
1274 };
1275
1276 struct protosw udplite6_protosw = {
1277 .pr_protocol = IPPROTO_UDPLITE,
1278 UDP6_PROTOSW
1279 };
1280
1281 static void
udp6_init(void * arg __unused)1282 udp6_init(void *arg __unused)
1283 {
1284
1285 IP6PROTO_REGISTER(IPPROTO_UDP, udp6_input, udp6_ctlinput);
1286 IP6PROTO_REGISTER(IPPROTO_UDPLITE, udp6_input, udplite6_ctlinput);
1287 }
1288 SYSINIT(udp6_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, udp6_init, NULL);
1289