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
146 INP_LOCK_ASSERT(inp);
147
148 /*
149 * Engage the tunneling protocol.
150 */
151 up = intoudpcb(inp);
152 if (up->u_tun_func != NULL) {
153 bool filtered;
154
155 in_pcbref(inp);
156 INP_RUNLOCK(inp);
157 filtered = (*up->u_tun_func)(n, off, inp,
158 (struct sockaddr *)&fromsa[0], up->u_tun_ctx);
159 INP_RLOCK(inp);
160 if (in_pcbrele_rlocked(inp))
161 return (1);
162 if (filtered) {
163 INP_RUNLOCK(inp);
164 return (1);
165 }
166 }
167
168 off += sizeof(struct udphdr);
169
170 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
171 /* Check AH/ESP integrity. */
172 if (IPSEC_ENABLED(ipv6)) {
173 if (IPSEC_CHECK_POLICY(ipv6, n, inp) != 0) {
174 m_freem(n);
175 return (0);
176 }
177
178 /* IPSec UDP encaps. */
179 if ((up->u_flags & UF_ESPINUDP) != 0 &&
180 UDPENCAP_INPUT(ipv6, n, off, AF_INET6) != 0) {
181 return (0); /* Consumed. */
182 }
183 }
184 #endif /* IPSEC */
185 #ifdef MAC
186 if (mac_inpcb_check_deliver(inp, n) != 0) {
187 m_freem(n);
188 return (0);
189 }
190 #endif
191 opts = NULL;
192 if (inp->inp_flags & INP_CONTROLOPTS ||
193 inp->inp_socket->so_options & SO_TIMESTAMP)
194 ip6_savecontrol(inp, n, &opts);
195 if ((inp->inp_vflag & INP_IPV6) && (inp->inp_flags2 & INP_ORIGDSTADDR)) {
196 tmp_opts = sbcreatecontrol(&fromsa[1],
197 sizeof(struct sockaddr_in6), IPV6_ORIGDSTADDR,
198 IPPROTO_IPV6, M_NOWAIT);
199 if (tmp_opts) {
200 if (opts) {
201 tmp_opts->m_next = opts;
202 opts = tmp_opts;
203 } else
204 opts = tmp_opts;
205 }
206 }
207 m_adj(n, off);
208
209 so = inp->inp_socket;
210 SOCKBUF_LOCK(&so->so_rcv);
211 if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)&fromsa[0], n,
212 opts) == 0) {
213 soroverflow_locked(so);
214 m_freem(n);
215 if (opts)
216 m_freem(opts);
217 UDPSTAT_INC(udps_fullsock);
218 } else
219 sorwakeup_locked(so);
220 return (0);
221 }
222
223 struct udp6_multi_match_ctx {
224 struct ip6_hdr *ip6;
225 struct udphdr *uh;
226 };
227
228 static bool
udp6_multi_match(const struct inpcb * inp,void * v)229 udp6_multi_match(const struct inpcb *inp, void *v)
230 {
231 struct udp6_multi_match_ctx *ctx = v;
232
233 if ((inp->inp_vflag & INP_IPV6) == 0)
234 return(false);
235 if (inp->inp_lport != ctx->uh->uh_dport)
236 return(false);
237 if (inp->inp_fport != 0 && inp->inp_fport != ctx->uh->uh_sport)
238 return(false);
239 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
240 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &ctx->ip6->ip6_dst))
241 return (false);
242 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
243 (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &ctx->ip6->ip6_src) ||
244 inp->inp_fport != ctx->uh->uh_sport))
245 return (false);
246
247 return (true);
248 }
249
250 static int
udp6_multi_input(struct mbuf * m,int off,int proto,struct sockaddr_in6 * fromsa)251 udp6_multi_input(struct mbuf *m, int off, int proto,
252 struct sockaddr_in6 *fromsa)
253 {
254 struct udp6_multi_match_ctx ctx;
255 struct inpcb_iterator inpi = INP_ITERATOR(udp_get_inpcbinfo(proto),
256 INPLOOKUP_RLOCKPCB, udp6_multi_match, &ctx);
257 struct inpcb *inp;
258 struct ip6_moptions *imo;
259 struct mbuf *n;
260 int appends = 0;
261
262 /*
263 * In the event that laddr should be set to the link-local
264 * address (this happens in RIPng), the multicast address
265 * specified in the received packet will not match laddr. To
266 * handle this situation, matching is relaxed if the
267 * receiving interface is the same as one specified in the
268 * socket and if the destination multicast address matches
269 * one of the multicast groups specified in the socket.
270 */
271
272 /*
273 * KAME note: traditionally we dropped udpiphdr from mbuf
274 * here. We need udphdr for IPsec processing so we do that
275 * later.
276 */
277 ctx.ip6 = mtod(m, struct ip6_hdr *);
278 ctx.uh = (struct udphdr *)((char *)ctx.ip6 + off);
279 while ((inp = inp_next(&inpi)) != NULL) {
280 INP_RLOCK_ASSERT(inp);
281 /*
282 * XXXRW: Because we weren't holding either the inpcb
283 * or the hash lock when we checked for a match
284 * before, we should probably recheck now that the
285 * inpcb lock is (supposed to be) held.
286 */
287 /*
288 * Handle socket delivery policy for any-source
289 * and source-specific multicast. [RFC3678]
290 */
291 if ((imo = inp->in6p_moptions) != NULL) {
292 struct sockaddr_in6 mcaddr;
293 int blocked;
294
295 bzero(&mcaddr, sizeof(struct sockaddr_in6));
296 mcaddr.sin6_len = sizeof(struct sockaddr_in6);
297 mcaddr.sin6_family = AF_INET6;
298 mcaddr.sin6_addr = ctx.ip6->ip6_dst;
299
300 blocked = im6o_mc_filter(imo, m->m_pkthdr.rcvif,
301 (struct sockaddr *)&mcaddr,
302 (struct sockaddr *)&fromsa[0]);
303 if (blocked != MCAST_PASS) {
304 if (blocked == MCAST_NOTGMEMBER)
305 IP6STAT_INC(ip6s_notmember);
306 if (blocked == MCAST_NOTSMEMBER ||
307 blocked == MCAST_MUTED)
308 UDPSTAT_INC(udps_filtermcast);
309 continue;
310 }
311 }
312 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) != NULL) {
313 if (proto == IPPROTO_UDPLITE)
314 UDPLITE_PROBE(receive, NULL, inp, ctx.ip6,
315 inp, ctx.uh);
316 else
317 UDP_PROBE(receive, NULL, inp, ctx.ip6, inp,
318 ctx.uh);
319 if (udp6_append(inp, n, off, fromsa)) {
320 break;
321 } else
322 appends++;
323 }
324 /*
325 * Don't look for additional matches if this one does
326 * not have either the SO_REUSEPORT or SO_REUSEADDR
327 * socket options set. This heuristic avoids
328 * searching through all pcbs in the common case of a
329 * non-shared port. It assumes that an application
330 * will never clear these options after setting them.
331 */
332 if ((inp->inp_socket->so_options &
333 (SO_REUSEPORT|SO_REUSEPORT_LB|SO_REUSEADDR)) == 0) {
334 INP_RUNLOCK(inp);
335 break;
336 }
337 }
338 m_freem(m);
339
340 if (appends == 0) {
341 /*
342 * No matching pcb found; discard datagram. (No need
343 * to send an ICMP Port Unreachable for a broadcast
344 * or multicast datgram.)
345 */
346 UDPSTAT_INC(udps_noport);
347 UDPSTAT_INC(udps_noportmcast);
348 }
349
350 return (IPPROTO_DONE);
351 }
352
353 int
udp6_input(struct mbuf ** mp,int * offp,int proto)354 udp6_input(struct mbuf **mp, int *offp, int proto)
355 {
356 struct mbuf *m = *mp;
357 struct ip6_hdr *ip6;
358 struct udphdr *uh;
359 struct inpcb *inp;
360 struct inpcbinfo *pcbinfo;
361 struct udpcb *up;
362 int off = *offp;
363 int cscov_partial;
364 int plen, ulen;
365 int lookupflags;
366 struct sockaddr_in6 fromsa[2];
367 struct m_tag *fwd_tag;
368 uint16_t uh_sum;
369 uint8_t nxt;
370
371 NET_EPOCH_ASSERT();
372
373 if (m->m_len < off + sizeof(struct udphdr)) {
374 m = m_pullup(m, off + sizeof(struct udphdr));
375 if (m == NULL) {
376 IP6STAT_INC(ip6s_exthdrtoolong);
377 *mp = NULL;
378 return (IPPROTO_DONE);
379 }
380 }
381 ip6 = mtod(m, struct ip6_hdr *);
382 uh = (struct udphdr *)((caddr_t)ip6 + off);
383
384 UDPSTAT_INC(udps_ipackets);
385
386 /*
387 * Destination port of 0 is illegal, based on RFC768.
388 */
389 if (uh->uh_dport == 0)
390 goto badunlocked;
391
392 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
393 ulen = ntohs((u_short)uh->uh_ulen);
394
395 nxt = proto;
396 cscov_partial = (nxt == IPPROTO_UDPLITE) ? 1 : 0;
397 if (nxt == IPPROTO_UDPLITE) {
398 /* Zero means checksum over the complete packet. */
399 if (ulen == 0)
400 ulen = plen;
401 if (ulen == plen)
402 cscov_partial = 0;
403 if ((ulen < sizeof(struct udphdr)) || (ulen > plen)) {
404 /* XXX: What is the right UDPLite MIB counter? */
405 goto badunlocked;
406 }
407 if (uh->uh_sum == 0) {
408 /* XXX: What is the right UDPLite MIB counter? */
409 goto badunlocked;
410 }
411 } else {
412 if ((ulen < sizeof(struct udphdr)) || (plen != ulen)) {
413 UDPSTAT_INC(udps_badlen);
414 goto badunlocked;
415 }
416 if (uh->uh_sum == 0) {
417 UDPSTAT_INC(udps_nosum);
418 /*
419 * dport 0 was rejected earlier so this is OK even if
420 * zero_checksum_port is 0 (which is its default value).
421 */
422 if (ntohs(uh->uh_dport) == V_zero_checksum_port)
423 goto skip_checksum;
424 else
425 goto badunlocked;
426 }
427 }
428
429 if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID_IPV6) &&
430 !cscov_partial) {
431 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
432 uh_sum = m->m_pkthdr.csum_data;
433 else
434 uh_sum = in6_cksum_pseudo(ip6, ulen, nxt,
435 m->m_pkthdr.csum_data);
436 uh_sum ^= 0xffff;
437 } else if (m->m_pkthdr.csum_flags & CSUM_IP6_UDP) {
438 /*
439 * Packet from local host (maybe from a VM).
440 * Checksum not required.
441 */
442 uh_sum = 0;
443 } else
444 uh_sum = in6_cksum_partial(m, nxt, off, plen, ulen);
445
446 if (uh_sum != 0) {
447 UDPSTAT_INC(udps_badsum);
448 goto badunlocked;
449 }
450
451 skip_checksum:
452 /*
453 * Construct sockaddr format source address.
454 */
455 init_sin6(&fromsa[0], m, 0);
456 fromsa[0].sin6_port = uh->uh_sport;
457 init_sin6(&fromsa[1], m, 1);
458 fromsa[1].sin6_port = uh->uh_dport;
459
460 pcbinfo = udp_get_inpcbinfo(nxt);
461 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
462 *mp = NULL;
463 return (udp6_multi_input(m, off, proto, fromsa));
464 }
465
466 /*
467 * Locate pcb for datagram.
468 */
469 lookupflags = INPLOOKUP_RLOCKPCB |
470 (V_udp_bind_all_fibs ? 0 : INPLOOKUP_FIB);
471
472 /*
473 * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
474 */
475 if ((m->m_flags & M_IP6_NEXTHOP) &&
476 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
477 struct sockaddr_in6 *next_hop6;
478
479 next_hop6 = (struct sockaddr_in6 *)(fwd_tag + 1);
480
481 /*
482 * Transparently forwarded. Pretend to be the destination.
483 * Already got one like this?
484 */
485 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src,
486 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
487 lookupflags, m->m_pkthdr.rcvif, m);
488 if (!inp) {
489 /*
490 * It's new. Try to find the ambushing socket.
491 * Because we've rewritten the destination address,
492 * any hardware-generated hash is ignored.
493 */
494 inp = in6_pcblookup(pcbinfo, &ip6->ip6_src,
495 uh->uh_sport, &next_hop6->sin6_addr,
496 next_hop6->sin6_port ? htons(next_hop6->sin6_port) :
497 uh->uh_dport, INPLOOKUP_WILDCARD | lookupflags,
498 m->m_pkthdr.rcvif);
499 }
500 /* Remove the tag from the packet. We don't need it anymore. */
501 m_tag_delete(m, fwd_tag);
502 m->m_flags &= ~M_IP6_NEXTHOP;
503 } else
504 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src,
505 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
506 INPLOOKUP_WILDCARD | lookupflags,
507 m->m_pkthdr.rcvif, m);
508 if (inp == NULL) {
509 if (V_udp_log_in_vain) {
510 char ip6bufs[INET6_ADDRSTRLEN];
511 char ip6bufd[INET6_ADDRSTRLEN];
512
513 log(LOG_INFO,
514 "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
515 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
516 ntohs(uh->uh_dport),
517 ip6_sprintf(ip6bufs, &ip6->ip6_src),
518 ntohs(uh->uh_sport));
519 }
520 if (nxt == IPPROTO_UDPLITE)
521 UDPLITE_PROBE(receive, NULL, NULL, ip6, NULL, uh);
522 else
523 UDP_PROBE(receive, NULL, NULL, ip6, NULL, uh);
524 UDPSTAT_INC(udps_noport);
525 if (m->m_flags & M_MCAST) {
526 printf("UDP6: M_MCAST is set in a unicast packet.\n");
527 UDPSTAT_INC(udps_noportmcast);
528 goto badunlocked;
529 }
530 if (V_udp_blackhole && (V_udp_blackhole_local ||
531 !in6_localip(&ip6->ip6_src)))
532 goto badunlocked;
533 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
534 *mp = NULL;
535 return (IPPROTO_DONE);
536 }
537 INP_RLOCK_ASSERT(inp);
538 up = intoudpcb(inp);
539 if (cscov_partial) {
540 if (up->u_rxcslen == 0 || up->u_rxcslen > ulen) {
541 INP_RUNLOCK(inp);
542 m_freem(m);
543 *mp = NULL;
544 return (IPPROTO_DONE);
545 }
546 }
547 if (nxt == IPPROTO_UDPLITE)
548 UDPLITE_PROBE(receive, NULL, inp, ip6, inp, uh);
549 else
550 UDP_PROBE(receive, NULL, inp, ip6, inp, uh);
551 if (udp6_append(inp, m, off, fromsa) == 0)
552 INP_RUNLOCK(inp);
553 *mp = NULL;
554 return (IPPROTO_DONE);
555
556 badunlocked:
557 m_freem(m);
558 *mp = NULL;
559 return (IPPROTO_DONE);
560 }
561
562 static void
udp6_common_ctlinput(struct ip6ctlparam * ip6cp,struct inpcbinfo * pcbinfo)563 udp6_common_ctlinput(struct ip6ctlparam *ip6cp, struct inpcbinfo *pcbinfo)
564 {
565 struct udphdr uh;
566 struct ip6_hdr *ip6;
567 struct mbuf *m;
568 struct inpcb *inp;
569 int errno, off = 0;
570 struct udp_portonly {
571 u_int16_t uh_sport;
572 u_int16_t uh_dport;
573 } *uhp;
574
575 if ((errno = icmp6_errmap(ip6cp->ip6c_icmp6)) == 0)
576 return;
577
578 m = ip6cp->ip6c_m;
579 ip6 = ip6cp->ip6c_ip6;
580 off = ip6cp->ip6c_off;
581
582 /* Check if we can safely examine src and dst ports. */
583 if (m->m_pkthdr.len < off + sizeof(*uhp))
584 return;
585
586 bzero(&uh, sizeof(uh));
587 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
588
589 /* Check to see if its tunneled */
590 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_dst, uh.uh_dport,
591 &ip6->ip6_src, uh.uh_sport, INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB,
592 m->m_pkthdr.rcvif, m);
593 if (inp != NULL) {
594 struct udpcb *up;
595 udp_tun_icmp_t *func;
596
597 up = intoudpcb(inp);
598 func = up->u_icmp_func;
599 INP_RUNLOCK(inp);
600 if (func != NULL)
601 func(ip6cp);
602 }
603 in6_pcbnotify(pcbinfo, ip6cp->ip6c_finaldst, uh.uh_dport,
604 ip6cp->ip6c_src, uh.uh_sport, errno, ip6cp->ip6c_cmdarg,
605 udp_notify);
606 }
607
608 static void
udp6_ctlinput(struct ip6ctlparam * ctl)609 udp6_ctlinput(struct ip6ctlparam *ctl)
610 {
611
612 return (udp6_common_ctlinput(ctl, &V_udbinfo));
613 }
614
615 static void
udplite6_ctlinput(struct ip6ctlparam * ctl)616 udplite6_ctlinput(struct ip6ctlparam *ctl)
617 {
618
619 return (udp6_common_ctlinput(ctl, &V_ulitecbinfo));
620 }
621
622 static int
udp6_getcred(SYSCTL_HANDLER_ARGS)623 udp6_getcred(SYSCTL_HANDLER_ARGS)
624 {
625 struct xucred xuc;
626 struct sockaddr_in6 addrs[2];
627 struct epoch_tracker et;
628 struct inpcb *inp;
629 int error;
630
631 if (req->newptr == NULL)
632 return (EINVAL);
633 error = priv_check(req->td, PRIV_NETINET_GETCRED);
634 if (error)
635 return (error);
636
637 if (req->newlen != sizeof(addrs))
638 return (EINVAL);
639 if (req->oldlen != sizeof(struct xucred))
640 return (EINVAL);
641 error = SYSCTL_IN(req, addrs, sizeof(addrs));
642 if (error)
643 return (error);
644 if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 ||
645 (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) {
646 return (error);
647 }
648 NET_EPOCH_ENTER(et);
649 inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr,
650 addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port,
651 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
652 NET_EPOCH_EXIT(et);
653 if (inp != NULL) {
654 INP_RLOCK_ASSERT(inp);
655 if (inp->inp_socket == NULL)
656 error = ENOENT;
657 if (error == 0)
658 error = cr_canseesocket(req->td->td_ucred,
659 inp->inp_socket);
660 if (error == 0)
661 cru2x(inp->inp_cred, &xuc);
662 INP_RUNLOCK(inp);
663 } else
664 error = ENOENT;
665 if (error == 0)
666 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
667 return (error);
668 }
669
670 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred,
671 CTLTYPE_OPAQUE | CTLFLAG_RW | CTLFLAG_MPSAFE,
672 0, 0, udp6_getcred, "S,xucred",
673 "Get the xucred of a UDP6 connection");
674
675 static int
udp6_send(struct socket * so,int flags_arg,struct mbuf * m,struct sockaddr * addr6,struct mbuf * control,struct thread * td)676 udp6_send(struct socket *so, int flags_arg, struct mbuf *m,
677 struct sockaddr *addr6, struct mbuf *control, struct thread *td)
678 {
679 struct inpcb *inp;
680 struct ip6_hdr *ip6;
681 struct udphdr *udp6;
682 struct in6_addr *laddr, *faddr, in6a;
683 struct ip6_pktopts *optp, opt;
684 struct sockaddr_in6 *sin6, tmp;
685 struct epoch_tracker et;
686 int cscov_partial, error, flags, hlen, scope_ambiguous;
687 u_int32_t ulen, plen;
688 uint16_t cscov;
689 u_short fport;
690 uint8_t nxt;
691
692 if (addr6) {
693 error = 0;
694 if (addr6->sa_family != AF_INET6)
695 error = EAFNOSUPPORT;
696 else if (addr6->sa_len != sizeof(struct sockaddr_in6))
697 error = EINVAL;
698 if (__predict_false(error != 0)) {
699 m_freem(control);
700 m_freem(m);
701 return (error);
702 }
703 }
704
705 sin6 = (struct sockaddr_in6 *)addr6;
706
707 /*
708 * In contrast to IPv4 we do not validate the max. packet length
709 * here due to IPv6 Jumbograms (RFC2675).
710 */
711
712 scope_ambiguous = 0;
713 if (sin6) {
714 /* Protect *addr6 from overwrites. */
715 tmp = *sin6;
716 sin6 = &tmp;
717
718 /*
719 * Application should provide a proper zone ID or the use of
720 * default zone IDs should be enabled. Unfortunately, some
721 * applications do not behave as it should, so we need a
722 * workaround. Even if an appropriate ID is not determined,
723 * we'll see if we can determine the outgoing interface. If we
724 * can, determine the zone ID based on the interface below.
725 */
726 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone)
727 scope_ambiguous = 1;
728 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0) {
729 if (control)
730 m_freem(control);
731 m_freem(m);
732 return (error);
733 }
734 }
735
736 inp = sotoinpcb(so);
737 KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
738 /*
739 * In the following cases we want a write lock on the inp for either
740 * local operations or for possible route cache updates in the IPv6
741 * output path:
742 * - on connected sockets (sin6 is NULL) for route cache updates,
743 * - when we are not bound to an address and source port (it is
744 * in6_pcbsetport() which will require the write lock).
745 *
746 * We check the inp fields before actually locking the inp, so
747 * here exists a race, and we may WLOCK the inp and end with already
748 * bound one by other thread. This is fine.
749 */
750 if (sin6 == NULL || (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
751 inp->inp_lport == 0))
752 INP_WLOCK(inp);
753 else
754 INP_RLOCK(inp);
755
756 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
757 IPPROTO_UDP : IPPROTO_UDPLITE;
758
759 #ifdef INET
760 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
761 int hasv4addr;
762
763 if (sin6 == NULL)
764 hasv4addr = (inp->inp_vflag & INP_IPV4);
765 else
766 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
767 ? 1 : 0;
768 if (hasv4addr) {
769 /*
770 * XXXRW: We release UDP-layer locks before calling
771 * udp_send() in order to avoid recursion. However,
772 * this does mean there is a short window where inp's
773 * fields are unstable. Could this lead to a
774 * potential race in which the factors causing us to
775 * select the UDPv4 output routine are invalidated?
776 */
777 INP_UNLOCK(inp);
778 if (sin6)
779 in6_sin6_2_sin_in_sock((struct sockaddr *)sin6);
780 /* addr will just be freed in sendit(). */
781 return (udp_send(so, flags_arg | PRUS_IPV6, m,
782 (struct sockaddr *)sin6, control, td));
783 }
784 } else
785 #endif
786 if (sin6 && IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
787 /*
788 * Given this is either an IPv6-only socket or no INET is
789 * supported we will fail the send if the given destination
790 * address is a v4mapped address.
791 */
792 INP_UNLOCK(inp);
793 m_freem(m);
794 m_freem(control);
795 return (EINVAL);
796 }
797
798 NET_EPOCH_ENTER(et);
799 if (control) {
800 if ((error = ip6_setpktopts(control, &opt,
801 inp->in6p_outputopts, td->td_ucred, nxt)) != 0) {
802 goto release;
803 }
804 optp = &opt;
805 } else
806 optp = inp->in6p_outputopts;
807
808 if (sin6) {
809 /*
810 * Since we saw no essential reason for calling in_pcbconnect,
811 * we get rid of such kind of logic, and call in6_selectsrc
812 * and in6_pcbsetport in order to fill in the local address
813 * and the local port.
814 */
815 if (sin6->sin6_port == 0) {
816 error = EADDRNOTAVAIL;
817 goto release;
818 }
819
820 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
821 /* how about ::ffff:0.0.0.0 case? */
822 error = EISCONN;
823 goto release;
824 }
825
826 /*
827 * Given we handle the v4mapped case in the INET block above
828 * assert here that it must not happen anymore.
829 */
830 KASSERT(!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr),
831 ("%s: sin6(%p)->sin6_addr is v4mapped which we "
832 "should have handled.", __func__, sin6));
833
834 /* This only requires read-locking. */
835 error = in6_selectsrc_socket(sin6, optp, inp,
836 td->td_ucred, scope_ambiguous, &in6a, NULL);
837 if (error)
838 goto release;
839 laddr = &in6a;
840
841 if (inp->inp_lport == 0) {
842 struct inpcbinfo *pcbinfo;
843
844 INP_WLOCK_ASSERT(inp);
845
846 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
847 INP_HASH_WLOCK(pcbinfo);
848 error = in6_pcbsetport(laddr, inp, td->td_ucred);
849 INP_HASH_WUNLOCK(pcbinfo);
850 if (error != 0) {
851 /* Undo an address bind that may have occurred. */
852 inp->in6p_laddr = in6addr_any;
853 goto release;
854 }
855 }
856 faddr = &sin6->sin6_addr;
857 fport = sin6->sin6_port; /* allow 0 port */
858
859 } else {
860 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
861 error = ENOTCONN;
862 goto release;
863 }
864 laddr = &inp->in6p_laddr;
865 faddr = &inp->in6p_faddr;
866 fport = inp->inp_fport;
867 }
868
869 ulen = m->m_pkthdr.len;
870 plen = sizeof(struct udphdr) + ulen;
871 hlen = sizeof(struct ip6_hdr);
872
873 /*
874 * Calculate data length and get a mbuf for UDP, IP6, and possible
875 * link-layer headers. Immediate slide the data pointer back forward
876 * since we won't use that space at this layer.
877 */
878 M_PREPEND(m, hlen + sizeof(struct udphdr) + max_linkhdr, M_NOWAIT);
879 if (m == NULL) {
880 error = ENOBUFS;
881 goto release;
882 }
883 m->m_data += max_linkhdr;
884 m->m_len -= max_linkhdr;
885 m->m_pkthdr.len -= max_linkhdr;
886
887 /*
888 * Stuff checksum and output datagram.
889 */
890 cscov = cscov_partial = 0;
891 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
892 udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */
893 udp6->uh_dport = fport;
894 if (nxt == IPPROTO_UDPLITE) {
895 struct udpcb *up;
896
897 up = intoudpcb(inp);
898 cscov = up->u_txcslen;
899 if (cscov >= plen)
900 cscov = 0;
901 udp6->uh_ulen = htons(cscov);
902 /*
903 * For UDP-Lite, checksum coverage length of zero means
904 * the entire UDPLite packet is covered by the checksum.
905 */
906 cscov_partial = (cscov == 0) ? 0 : 1;
907 } else if (plen <= 0xffff)
908 udp6->uh_ulen = htons((u_short)plen);
909 else
910 udp6->uh_ulen = 0;
911 udp6->uh_sum = 0;
912
913 ip6 = mtod(m, struct ip6_hdr *);
914 ip6->ip6_flow = inp->inp_flow & IPV6_FLOWINFO_MASK;
915 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
916 ip6->ip6_vfc |= IPV6_VERSION;
917 ip6->ip6_plen = htons((u_short)plen);
918 ip6->ip6_nxt = nxt;
919 ip6->ip6_hlim = in6_selecthlim(inp, NULL);
920 ip6->ip6_src = *laddr;
921 ip6->ip6_dst = *faddr;
922
923 #ifdef MAC
924 mac_inpcb_create_mbuf(inp, m);
925 #endif
926
927 if (cscov_partial) {
928 if ((udp6->uh_sum = in6_cksum_partial(m, nxt,
929 sizeof(struct ip6_hdr), plen, cscov)) == 0)
930 udp6->uh_sum = 0xffff;
931 } else {
932 udp6->uh_sum = in6_cksum_pseudo(ip6, plen, nxt, 0);
933 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6;
934 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
935 }
936
937 flags = 0;
938 #if defined(ROUTE_MPATH) || defined(RSS)
939 if (CALC_FLOWID_OUTBOUND_SENDTO) {
940 uint32_t hash_type, hash_val;
941 uint8_t pr;
942
943 pr = inp->inp_socket->so_proto->pr_protocol;
944
945 hash_val = fib6_calc_packet_hash(laddr, faddr,
946 inp->inp_lport, fport, pr, &hash_type);
947 m->m_pkthdr.flowid = hash_val;
948 M_HASHTYPE_SET(m, hash_type);
949 }
950 /* do not use inp flowid */
951 flags |= IP_NODEFAULTFLOWID;
952 #endif
953
954 UDPSTAT_INC(udps_opackets);
955 if (nxt == IPPROTO_UDPLITE)
956 UDPLITE_PROBE(send, NULL, inp, ip6, inp, udp6);
957 else
958 UDP_PROBE(send, NULL, inp, ip6, inp, udp6);
959 error = ip6_output(m, optp,
960 INP_WLOCKED(inp) ? &inp->inp_route6 : NULL, flags,
961 inp->in6p_moptions, NULL, inp);
962 INP_UNLOCK(inp);
963 NET_EPOCH_EXIT(et);
964
965 if (control) {
966 ip6_clearpktopts(&opt, -1);
967 m_freem(control);
968 }
969 return (error);
970
971 release:
972 INP_UNLOCK(inp);
973 NET_EPOCH_EXIT(et);
974 if (control) {
975 ip6_clearpktopts(&opt, -1);
976 m_freem(control);
977 }
978 m_freem(m);
979
980 return (error);
981 }
982
983 static void
udp6_abort(struct socket * so)984 udp6_abort(struct socket *so)
985 {
986 struct inpcb *inp;
987 struct inpcbinfo *pcbinfo;
988
989 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
990 inp = sotoinpcb(so);
991 KASSERT(inp != NULL, ("udp6_abort: inp == NULL"));
992
993 INP_WLOCK(inp);
994 #ifdef INET
995 if (inp->inp_vflag & INP_IPV4) {
996 INP_WUNLOCK(inp);
997 udp_abort(so);
998 return;
999 }
1000 #endif
1001
1002 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1003 INP_HASH_WLOCK(pcbinfo);
1004 in6_pcbdisconnect(inp);
1005 INP_HASH_WUNLOCK(pcbinfo);
1006 soisdisconnected(so);
1007 }
1008 INP_WUNLOCK(inp);
1009 }
1010
1011 static int
udp6_attach(struct socket * so,int proto,struct thread * td)1012 udp6_attach(struct socket *so, int proto, struct thread *td)
1013 {
1014 struct inpcbinfo *pcbinfo;
1015 struct inpcb *inp;
1016 struct udpcb *up;
1017 int error;
1018
1019 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1020 inp = sotoinpcb(so);
1021 KASSERT(inp == NULL, ("udp6_attach: inp != NULL"));
1022
1023 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1024 error = soreserve(so, udp_sendspace, udp_recvspace);
1025 if (error)
1026 return (error);
1027 }
1028 error = in_pcballoc(so, pcbinfo);
1029 if (error)
1030 return (error);
1031 inp = (struct inpcb *)so->so_pcb;
1032 inp->in6p_cksum = -1; /* just to be sure */
1033 /*
1034 * XXX: ugly!!
1035 * IPv4 TTL initialization is necessary for an IPv6 socket as well,
1036 * because the socket may be bound to an IPv6 wildcard address,
1037 * which may match an IPv4-mapped IPv6 address.
1038 */
1039 inp->inp_ip_ttl = V_ip_defttl;
1040 up = intoudpcb(inp);
1041 bzero(&up->u_start_zero, u_zero_size);
1042 INP_WUNLOCK(inp);
1043 return (0);
1044 }
1045
1046 static int
udp6_bind(struct socket * so,struct sockaddr * nam,struct thread * td)1047 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
1048 {
1049 struct sockaddr_in6 *sin6_p;
1050 struct inpcb *inp;
1051 struct inpcbinfo *pcbinfo;
1052 int error;
1053 u_char vflagsav;
1054
1055 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1056 inp = sotoinpcb(so);
1057 KASSERT(inp != NULL, ("udp6_bind: inp == NULL"));
1058
1059 if (nam->sa_family != AF_INET6)
1060 return (EAFNOSUPPORT);
1061 if (nam->sa_len != sizeof(struct sockaddr_in6))
1062 return (EINVAL);
1063
1064 sin6_p = (struct sockaddr_in6 *)nam;
1065
1066 INP_WLOCK(inp);
1067 INP_HASH_WLOCK(pcbinfo);
1068 vflagsav = inp->inp_vflag;
1069 inp->inp_vflag &= ~INP_IPV4;
1070 inp->inp_vflag |= INP_IPV6;
1071 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
1072 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
1073 inp->inp_vflag |= INP_IPV4;
1074 #ifdef INET
1075 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
1076 struct sockaddr_in sin;
1077
1078 in6_sin6_2_sin(&sin, sin6_p);
1079 inp->inp_vflag |= INP_IPV4;
1080 inp->inp_vflag &= ~INP_IPV6;
1081 error = in_pcbbind(inp, &sin,
1082 V_udp_bind_all_fibs ? 0 : INPBIND_FIB,
1083 td->td_ucred);
1084 goto out;
1085 }
1086 #endif
1087 }
1088
1089 error = in6_pcbbind(inp, sin6_p, V_udp_bind_all_fibs ? 0 : INPBIND_FIB,
1090 td->td_ucred);
1091 #ifdef INET
1092 out:
1093 #endif
1094 if (error != 0)
1095 inp->inp_vflag = vflagsav;
1096 INP_HASH_WUNLOCK(pcbinfo);
1097 INP_WUNLOCK(inp);
1098 return (error);
1099 }
1100
1101 static void
udp6_close(struct socket * so)1102 udp6_close(struct socket *so)
1103 {
1104 struct inpcb *inp;
1105 struct inpcbinfo *pcbinfo;
1106
1107 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1108 inp = sotoinpcb(so);
1109 KASSERT(inp != NULL, ("udp6_close: inp == NULL"));
1110
1111 INP_WLOCK(inp);
1112 #ifdef INET
1113 if (inp->inp_vflag & INP_IPV4) {
1114 INP_WUNLOCK(inp);
1115 (void)udp_disconnect(so);
1116 return;
1117 }
1118 #endif
1119 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1120 INP_HASH_WLOCK(pcbinfo);
1121 in6_pcbdisconnect(inp);
1122 INP_HASH_WUNLOCK(pcbinfo);
1123 soisdisconnected(so);
1124 }
1125 INP_WUNLOCK(inp);
1126 }
1127
1128 static int
udp6_connect(struct socket * so,struct sockaddr * nam,struct thread * td)1129 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1130 {
1131 struct epoch_tracker et;
1132 struct inpcb *inp;
1133 struct inpcbinfo *pcbinfo;
1134 struct sockaddr_in6 *sin6;
1135 int error;
1136 u_char vflagsav;
1137
1138 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1139 inp = sotoinpcb(so);
1140 KASSERT(inp != NULL, ("udp6_connect: inp == NULL"));
1141
1142 sin6 = (struct sockaddr_in6 *)nam;
1143 if (sin6->sin6_family != AF_INET6)
1144 return (EAFNOSUPPORT);
1145 if (sin6->sin6_len != sizeof(*sin6))
1146 return (EINVAL);
1147
1148 /*
1149 * XXXRW: Need to clarify locking of v4/v6 flags.
1150 */
1151 INP_WLOCK(inp);
1152 #ifdef INET
1153 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
1154 struct sockaddr_in sin;
1155
1156 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
1157 error = EINVAL;
1158 goto out;
1159 }
1160 if ((inp->inp_vflag & INP_IPV4) == 0) {
1161 error = EAFNOSUPPORT;
1162 goto out;
1163 }
1164 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1165 error = EISCONN;
1166 goto out;
1167 }
1168 in6_sin6_2_sin(&sin, sin6);
1169 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr);
1170 if (error != 0)
1171 goto out;
1172 vflagsav = inp->inp_vflag;
1173 inp->inp_vflag |= INP_IPV4;
1174 inp->inp_vflag &= ~INP_IPV6;
1175 NET_EPOCH_ENTER(et);
1176 INP_HASH_WLOCK(pcbinfo);
1177 error = in_pcbconnect(inp, &sin, td->td_ucred);
1178 INP_HASH_WUNLOCK(pcbinfo);
1179 NET_EPOCH_EXIT(et);
1180 /*
1181 * If connect succeeds, mark socket as connected. If
1182 * connect fails and socket is unbound, reset inp_vflag
1183 * field.
1184 */
1185 if (error == 0)
1186 soisconnected(so);
1187 else if (inp->inp_laddr.s_addr == INADDR_ANY &&
1188 inp->inp_lport == 0)
1189 inp->inp_vflag = vflagsav;
1190 goto out;
1191 } else {
1192 if ((inp->inp_vflag & INP_IPV6) == 0) {
1193 error = EAFNOSUPPORT;
1194 goto out;
1195 }
1196 }
1197 #endif
1198 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1199 error = EISCONN;
1200 goto out;
1201 }
1202 error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr);
1203 if (error != 0)
1204 goto out;
1205 vflagsav = inp->inp_vflag;
1206 inp->inp_vflag &= ~INP_IPV4;
1207 inp->inp_vflag |= INP_IPV6;
1208 NET_EPOCH_ENTER(et);
1209 INP_HASH_WLOCK(pcbinfo);
1210 error = in6_pcbconnect(inp, sin6, td->td_ucred, true);
1211 INP_HASH_WUNLOCK(pcbinfo);
1212 NET_EPOCH_EXIT(et);
1213 /*
1214 * If connect succeeds, mark socket as connected. If
1215 * connect fails and socket is unbound, reset inp_vflag
1216 * field.
1217 */
1218 if (error == 0)
1219 soisconnected(so);
1220 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
1221 inp->inp_lport == 0)
1222 inp->inp_vflag = vflagsav;
1223 out:
1224 INP_WUNLOCK(inp);
1225 return (error);
1226 }
1227
1228 static void
udp6_detach(struct socket * so)1229 udp6_detach(struct socket *so)
1230 {
1231 struct inpcb *inp;
1232
1233 inp = sotoinpcb(so);
1234 KASSERT(inp != NULL, ("udp6_detach: inp == NULL"));
1235
1236 INP_WLOCK(inp);
1237 in_pcbfree(inp);
1238 }
1239
1240 static int
udp6_disconnect(struct socket * so)1241 udp6_disconnect(struct socket *so)
1242 {
1243 struct inpcb *inp;
1244 struct inpcbinfo *pcbinfo;
1245
1246 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1247 inp = sotoinpcb(so);
1248 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL"));
1249
1250 INP_WLOCK(inp);
1251 #ifdef INET
1252 if (inp->inp_vflag & INP_IPV4) {
1253 INP_WUNLOCK(inp);
1254 (void)udp_disconnect(so);
1255 return (0);
1256 }
1257 #endif
1258
1259 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1260 INP_WUNLOCK(inp);
1261 return (ENOTCONN);
1262 }
1263
1264 INP_HASH_WLOCK(pcbinfo);
1265 in6_pcbdisconnect(inp);
1266 INP_HASH_WUNLOCK(pcbinfo);
1267 SOCK_LOCK(so);
1268 so->so_state &= ~SS_ISCONNECTED; /* XXX */
1269 SOCK_UNLOCK(so);
1270 INP_WUNLOCK(inp);
1271 return (0);
1272 }
1273
1274 #define UDP6_PROTOSW \
1275 .pr_type = SOCK_DGRAM, \
1276 .pr_flags = PR_ATOMIC|PR_ADDR|PR_CAPATTACH, \
1277 .pr_ctloutput = udp_ctloutput, \
1278 .pr_abort = udp6_abort, \
1279 .pr_attach = udp6_attach, \
1280 .pr_bind = udp6_bind, \
1281 .pr_connect = udp6_connect, \
1282 .pr_control = in6_control, \
1283 .pr_detach = udp6_detach, \
1284 .pr_disconnect = udp6_disconnect, \
1285 .pr_peeraddr = in6_mapped_peeraddr, \
1286 .pr_send = udp6_send, \
1287 .pr_shutdown = udp_shutdown, \
1288 .pr_sockaddr = in6_mapped_sockaddr, \
1289 .pr_soreceive = soreceive_dgram, \
1290 .pr_sosend = sosend_dgram, \
1291 .pr_sosetlabel = in_pcbsosetlabel, \
1292 .pr_close = udp6_close
1293
1294 struct protosw udp6_protosw = {
1295 .pr_protocol = IPPROTO_UDP,
1296 UDP6_PROTOSW
1297 };
1298
1299 struct protosw udplite6_protosw = {
1300 .pr_protocol = IPPROTO_UDPLITE,
1301 UDP6_PROTOSW
1302 };
1303
1304 static void
udp6_init(void * arg __unused)1305 udp6_init(void *arg __unused)
1306 {
1307
1308 IP6PROTO_REGISTER(IPPROTO_UDP, udp6_input, udp6_ctlinput);
1309 IP6PROTO_REGISTER(IPPROTO_UDPLITE, udp6_input, udplite6_ctlinput);
1310 }
1311 SYSINIT(udp6_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, udp6_init, NULL);
1312