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 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95
70 */
71
72 #include <sys/cdefs.h>
73 __FBSDID("$FreeBSD: releng/12.0/sys/netinet6/udp6_usrreq.c 339251 2018-10-09 13:26:06Z jtl $");
74
75 #include "opt_inet.h"
76 #include "opt_inet6.h"
77 #include "opt_ipsec.h"
78 #include "opt_rss.h"
79
80 #include <sys/param.h>
81 #include <sys/jail.h>
82 #include <sys/kernel.h>
83 #include <sys/lock.h>
84 #include <sys/mbuf.h>
85 #include <sys/priv.h>
86 #include <sys/proc.h>
87 #include <sys/protosw.h>
88 #include <sys/sdt.h>
89 #include <sys/signalvar.h>
90 #include <sys/socket.h>
91 #include <sys/socketvar.h>
92 #include <sys/sx.h>
93 #include <sys/sysctl.h>
94 #include <sys/syslog.h>
95 #include <sys/systm.h>
96
97 #include <net/if.h>
98 #include <net/if_var.h>
99 #include <net/if_types.h>
100 #include <net/route.h>
101 #include <net/rss_config.h>
102
103 #include <netinet/in.h>
104 #include <netinet/in_kdtrace.h>
105 #include <netinet/in_pcb.h>
106 #include <netinet/in_systm.h>
107 #include <netinet/in_var.h>
108 #include <netinet/ip.h>
109 #include <netinet/ip6.h>
110 #include <netinet/icmp6.h>
111 #include <netinet/ip_var.h>
112 #include <netinet/udp.h>
113 #include <netinet/udp_var.h>
114 #include <netinet/udplite.h>
115
116 #include <netinet6/ip6protosw.h>
117 #include <netinet6/ip6_var.h>
118 #include <netinet6/in6_pcb.h>
119 #include <netinet6/in6_rss.h>
120 #include <netinet6/udp6_var.h>
121 #include <netinet6/scope6_var.h>
122
123 #include <netipsec/ipsec_support.h>
124
125 #include <security/mac/mac_framework.h>
126
127 /*
128 * UDP protocol implementation.
129 * Per RFC 768, August, 1980.
130 */
131
132 extern struct protosw inetsw[];
133 static void udp6_detach(struct socket *so);
134
135 static int
136 udp6_append(struct inpcb *inp, struct mbuf *n, int off,
137 struct sockaddr_in6 *fromsa)
138 {
139 struct socket *so;
140 struct mbuf *opts = NULL, *tmp_opts;
141 struct udpcb *up;
142
143 INP_LOCK_ASSERT(inp);
144
145 /*
146 * Engage the tunneling protocol.
147 */
148 up = intoudpcb(inp);
149 if (up->u_tun_func != NULL) {
150 in_pcbref(inp);
151 INP_RUNLOCK(inp);
152 (*up->u_tun_func)(n, off, inp, (struct sockaddr *)&fromsa[0],
153 up->u_tun_ctx);
154 INP_RLOCK(inp);
155 return (in_pcbrele_rlocked(inp));
156 }
157 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
158 /* Check AH/ESP integrity. */
159 if (IPSEC_ENABLED(ipv6)) {
160 if (IPSEC_CHECK_POLICY(ipv6, n, inp) != 0) {
161 m_freem(n);
162 return (0);
163 }
164 }
165 #endif /* IPSEC */
166 #ifdef MAC
167 if (mac_inpcb_check_deliver(inp, n) != 0) {
168 m_freem(n);
169 return (0);
170 }
171 #endif
172 opts = NULL;
173 if (inp->inp_flags & INP_CONTROLOPTS ||
174 inp->inp_socket->so_options & SO_TIMESTAMP)
175 ip6_savecontrol(inp, n, &opts);
176 if ((inp->inp_vflag & INP_IPV6) && (inp->inp_flags2 & INP_ORIGDSTADDR)) {
177 tmp_opts = sbcreatecontrol((caddr_t)&fromsa[1],
178 sizeof(struct sockaddr_in6), IPV6_ORIGDSTADDR, IPPROTO_IPV6);
179 if (tmp_opts) {
180 if (opts) {
181 tmp_opts->m_next = opts;
182 opts = tmp_opts;
183 } else
184 opts = tmp_opts;
185 }
186
187 }
188 m_adj(n, off + sizeof(struct udphdr));
189
190 so = inp->inp_socket;
191 SOCKBUF_LOCK(&so->so_rcv);
192 if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)&fromsa[0], n,
193 opts) == 0) {
194 SOCKBUF_UNLOCK(&so->so_rcv);
195 m_freem(n);
196 if (opts)
197 m_freem(opts);
198 UDPSTAT_INC(udps_fullsock);
199 } else
200 sorwakeup_locked(so);
201 return (0);
202 }
203
204 int
205 udp6_input(struct mbuf **mp, int *offp, int proto)
206 {
207 struct mbuf *m = *mp;
208 struct ifnet *ifp;
209 struct ip6_hdr *ip6;
210 struct udphdr *uh;
211 struct inpcb *inp;
212 struct inpcbinfo *pcbinfo;
213 struct udpcb *up;
214 int off = *offp;
215 int cscov_partial;
216 int plen, ulen;
217 struct epoch_tracker et;
218 struct sockaddr_in6 fromsa[2];
219 struct m_tag *fwd_tag;
220 uint16_t uh_sum;
221 uint8_t nxt;
222
223 ifp = m->m_pkthdr.rcvif;
224
225 #ifndef PULLDOWN_TEST
226 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
227 ip6 = mtod(m, struct ip6_hdr *);
228 uh = (struct udphdr *)((caddr_t)ip6 + off);
229 #else
230 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh));
231 if (!uh)
232 return (IPPROTO_DONE);
233 ip6 = mtod(m, struct ip6_hdr *);
234 #endif
235
236 UDPSTAT_INC(udps_ipackets);
237
238 /*
239 * Destination port of 0 is illegal, based on RFC768.
240 */
241 if (uh->uh_dport == 0)
242 goto badunlocked;
243
244 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
245 ulen = ntohs((u_short)uh->uh_ulen);
246
247 nxt = proto;
248 cscov_partial = (nxt == IPPROTO_UDPLITE) ? 1 : 0;
249 if (nxt == IPPROTO_UDPLITE) {
250 /* Zero means checksum over the complete packet. */
251 if (ulen == 0)
252 ulen = plen;
253 if (ulen == plen)
254 cscov_partial = 0;
255 if ((ulen < sizeof(struct udphdr)) || (ulen > plen)) {
256 /* XXX: What is the right UDPLite MIB counter? */
257 goto badunlocked;
258 }
259 if (uh->uh_sum == 0) {
260 /* XXX: What is the right UDPLite MIB counter? */
261 goto badunlocked;
262 }
263 } else {
264 if ((ulen < sizeof(struct udphdr)) || (plen != ulen)) {
265 UDPSTAT_INC(udps_badlen);
266 goto badunlocked;
267 }
268 if (uh->uh_sum == 0) {
269 UDPSTAT_INC(udps_nosum);
270 goto badunlocked;
271 }
272 }
273
274 if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID_IPV6) &&
275 !cscov_partial) {
276 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
277 uh_sum = m->m_pkthdr.csum_data;
278 else
279 uh_sum = in6_cksum_pseudo(ip6, ulen, nxt,
280 m->m_pkthdr.csum_data);
281 uh_sum ^= 0xffff;
282 } else
283 uh_sum = in6_cksum_partial(m, nxt, off, plen, ulen);
284
285 if (uh_sum != 0) {
286 UDPSTAT_INC(udps_badsum);
287 goto badunlocked;
288 }
289
290 /*
291 * Construct sockaddr format source address.
292 */
293 init_sin6(&fromsa[0], m, 0);
294 fromsa[0].sin6_port = uh->uh_sport;
295 init_sin6(&fromsa[1], m, 1);
296 fromsa[1].sin6_port = uh->uh_dport;
297
298 pcbinfo = udp_get_inpcbinfo(nxt);
299 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
300 struct inpcb *last;
301 struct inpcbhead *pcblist;
302 struct ip6_moptions *imo;
303
304 INP_INFO_RLOCK_ET(pcbinfo, et);
305 /*
306 * In the event that laddr should be set to the link-local
307 * address (this happens in RIPng), the multicast address
308 * specified in the received packet will not match laddr. To
309 * handle this situation, matching is relaxed if the
310 * receiving interface is the same as one specified in the
311 * socket and if the destination multicast address matches
312 * one of the multicast groups specified in the socket.
313 */
314
315 /*
316 * KAME note: traditionally we dropped udpiphdr from mbuf
317 * here. We need udphdr for IPsec processing so we do that
318 * later.
319 */
320 pcblist = udp_get_pcblist(nxt);
321 last = NULL;
322 CK_LIST_FOREACH(inp, pcblist, inp_list) {
323 if ((inp->inp_vflag & INP_IPV6) == 0)
324 continue;
325 if (inp->inp_lport != uh->uh_dport)
326 continue;
327 if (inp->inp_fport != 0 &&
328 inp->inp_fport != uh->uh_sport)
329 continue;
330 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
331 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
332 &ip6->ip6_dst))
333 continue;
334 }
335 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
336 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
337 &ip6->ip6_src) ||
338 inp->inp_fport != uh->uh_sport)
339 continue;
340 }
341
342 /*
343 * XXXRW: Because we weren't holding either the inpcb
344 * or the hash lock when we checked for a match
345 * before, we should probably recheck now that the
346 * inpcb lock is (supposed to be) held.
347 */
348
349 /*
350 * Handle socket delivery policy for any-source
351 * and source-specific multicast. [RFC3678]
352 */
353 imo = inp->in6p_moptions;
354 if (imo && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
355 struct sockaddr_in6 mcaddr;
356 int blocked;
357
358 INP_RLOCK(inp);
359 if (__predict_false(inp->inp_flags2 & INP_FREED)) {
360 INP_RUNLOCK(inp);
361 continue;
362 }
363
364 bzero(&mcaddr, sizeof(struct sockaddr_in6));
365 mcaddr.sin6_len = sizeof(struct sockaddr_in6);
366 mcaddr.sin6_family = AF_INET6;
367 mcaddr.sin6_addr = ip6->ip6_dst;
368
369 blocked = im6o_mc_filter(imo, ifp,
370 (struct sockaddr *)&mcaddr,
371 (struct sockaddr *)&fromsa[0]);
372 if (blocked != MCAST_PASS) {
373 if (blocked == MCAST_NOTGMEMBER)
374 IP6STAT_INC(ip6s_notmember);
375 if (blocked == MCAST_NOTSMEMBER ||
376 blocked == MCAST_MUTED)
377 UDPSTAT_INC(udps_filtermcast);
378 INP_RUNLOCK(inp); /* XXX */
379 continue;
380 }
381
382 INP_RUNLOCK(inp);
383 }
384 if (last != NULL) {
385 struct mbuf *n;
386
387 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) !=
388 NULL) {
389 INP_RLOCK(last);
390 if (__predict_true(last->inp_flags2 & INP_FREED) == 0) {
391 if (nxt == IPPROTO_UDPLITE)
392 UDPLITE_PROBE(receive, NULL, last,
393 ip6, last, uh);
394 else
395 UDP_PROBE(receive, NULL, last,
396 ip6, last, uh);
397 if (udp6_append(last, n, off, fromsa))
398 goto inp_lost;
399 }
400 INP_RUNLOCK(last);
401 }
402 }
403 last = inp;
404 /*
405 * Don't look for additional matches if this one does
406 * not have either the SO_REUSEPORT or SO_REUSEADDR
407 * socket options set. This heuristic avoids
408 * searching through all pcbs in the common case of a
409 * non-shared port. It assumes that an application
410 * will never clear these options after setting them.
411 */
412 if ((last->inp_socket->so_options &
413 (SO_REUSEPORT|SO_REUSEPORT_LB|SO_REUSEADDR)) == 0)
414 break;
415 }
416
417 if (last == NULL) {
418 /*
419 * No matching pcb found; discard datagram. (No need
420 * to send an ICMP Port Unreachable for a broadcast
421 * or multicast datgram.)
422 */
423 UDPSTAT_INC(udps_noport);
424 UDPSTAT_INC(udps_noportmcast);
425 goto badheadlocked;
426 }
427 INP_RLOCK(last);
428 if (__predict_true(last->inp_flags2 & INP_FREED) == 0) {
429 if (nxt == IPPROTO_UDPLITE)
430 UDPLITE_PROBE(receive, NULL, last, ip6, last, uh);
431 else
432 UDP_PROBE(receive, NULL, last, ip6, last, uh);
433 if (udp6_append(last, m, off, fromsa) == 0)
434 INP_RUNLOCK(last);
435 } else
436 INP_RUNLOCK(last);
437 inp_lost:
438 INP_INFO_RUNLOCK_ET(pcbinfo, et);
439 return (IPPROTO_DONE);
440 }
441 /*
442 * Locate pcb for datagram.
443 */
444
445 /*
446 * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
447 */
448 if ((m->m_flags & M_IP6_NEXTHOP) &&
449 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
450 struct sockaddr_in6 *next_hop6;
451
452 next_hop6 = (struct sockaddr_in6 *)(fwd_tag + 1);
453
454 /*
455 * Transparently forwarded. Pretend to be the destination.
456 * Already got one like this?
457 */
458 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src,
459 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
460 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif, m);
461 if (!inp) {
462 /*
463 * It's new. Try to find the ambushing socket.
464 * Because we've rewritten the destination address,
465 * any hardware-generated hash is ignored.
466 */
467 inp = in6_pcblookup(pcbinfo, &ip6->ip6_src,
468 uh->uh_sport, &next_hop6->sin6_addr,
469 next_hop6->sin6_port ? htons(next_hop6->sin6_port) :
470 uh->uh_dport, INPLOOKUP_WILDCARD |
471 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif);
472 }
473 /* Remove the tag from the packet. We don't need it anymore. */
474 m_tag_delete(m, fwd_tag);
475 m->m_flags &= ~M_IP6_NEXTHOP;
476 } else
477 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src,
478 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
479 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB,
480 m->m_pkthdr.rcvif, m);
481 if (inp == NULL) {
482 if (udp_log_in_vain) {
483 char ip6bufs[INET6_ADDRSTRLEN];
484 char ip6bufd[INET6_ADDRSTRLEN];
485
486 log(LOG_INFO,
487 "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
488 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
489 ntohs(uh->uh_dport),
490 ip6_sprintf(ip6bufs, &ip6->ip6_src),
491 ntohs(uh->uh_sport));
492 }
493 if (nxt == IPPROTO_UDPLITE)
494 UDPLITE_PROBE(receive, NULL, NULL, ip6, NULL, uh);
495 else
496 UDP_PROBE(receive, NULL, NULL, ip6, NULL, uh);
497 UDPSTAT_INC(udps_noport);
498 if (m->m_flags & M_MCAST) {
499 printf("UDP6: M_MCAST is set in a unicast packet.\n");
500 UDPSTAT_INC(udps_noportmcast);
501 goto badunlocked;
502 }
503 if (V_udp_blackhole)
504 goto badunlocked;
505 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
506 return (IPPROTO_DONE);
507 }
508 INP_RLOCK_ASSERT(inp);
509 up = intoudpcb(inp);
510 if (cscov_partial) {
511 if (up->u_rxcslen == 0 || up->u_rxcslen > ulen) {
512 INP_RUNLOCK(inp);
513 m_freem(m);
514 return (IPPROTO_DONE);
515 }
516 }
517 if (nxt == IPPROTO_UDPLITE)
518 UDPLITE_PROBE(receive, NULL, inp, ip6, inp, uh);
519 else
520 UDP_PROBE(receive, NULL, inp, ip6, inp, uh);
521 if (udp6_append(inp, m, off, fromsa) == 0)
522 INP_RUNLOCK(inp);
523 return (IPPROTO_DONE);
524
525 badheadlocked:
526 INP_INFO_RUNLOCK_ET(pcbinfo, et);
527 badunlocked:
528 if (m)
529 m_freem(m);
530 return (IPPROTO_DONE);
531 }
532
533 static void
534 udp6_common_ctlinput(int cmd, struct sockaddr *sa, void *d,
535 struct inpcbinfo *pcbinfo)
536 {
537 struct udphdr uh;
538 struct ip6_hdr *ip6;
539 struct mbuf *m;
540 int off = 0;
541 struct ip6ctlparam *ip6cp = NULL;
542 const struct sockaddr_in6 *sa6_src = NULL;
543 void *cmdarg;
544 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify;
545 struct udp_portonly {
546 u_int16_t uh_sport;
547 u_int16_t uh_dport;
548 } *uhp;
549
550 if (sa->sa_family != AF_INET6 ||
551 sa->sa_len != sizeof(struct sockaddr_in6))
552 return;
553
554 if ((unsigned)cmd >= PRC_NCMDS)
555 return;
556 if (PRC_IS_REDIRECT(cmd))
557 notify = in6_rtchange, d = NULL;
558 else if (cmd == PRC_HOSTDEAD)
559 d = NULL;
560 else if (inet6ctlerrmap[cmd] == 0)
561 return;
562
563 /* if the parameter is from icmp6, decode it. */
564 if (d != NULL) {
565 ip6cp = (struct ip6ctlparam *)d;
566 m = ip6cp->ip6c_m;
567 ip6 = ip6cp->ip6c_ip6;
568 off = ip6cp->ip6c_off;
569 cmdarg = ip6cp->ip6c_cmdarg;
570 sa6_src = ip6cp->ip6c_src;
571 } else {
572 m = NULL;
573 ip6 = NULL;
574 cmdarg = NULL;
575 sa6_src = &sa6_any;
576 }
577
578 if (ip6) {
579 /*
580 * XXX: We assume that when IPV6 is non NULL,
581 * M and OFF are valid.
582 */
583
584 /* Check if we can safely examine src and dst ports. */
585 if (m->m_pkthdr.len < off + sizeof(*uhp))
586 return;
587
588 bzero(&uh, sizeof(uh));
589 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
590
591 if (!PRC_IS_REDIRECT(cmd)) {
592 /* Check to see if its tunneled */
593 struct inpcb *inp;
594 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_dst,
595 uh.uh_dport, &ip6->ip6_src, uh.uh_sport,
596 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB,
597 m->m_pkthdr.rcvif, m);
598 if (inp != NULL) {
599 struct udpcb *up;
600
601 up = intoudpcb(inp);
602 if (up->u_icmp_func) {
603 /* Yes it is. */
604 INP_RUNLOCK(inp);
605 (*up->u_icmp_func)(cmd, (struct sockaddr *)ip6cp->ip6c_src,
606 d, up->u_tun_ctx);
607 return;
608 } else {
609 /* Can't find it. */
610 INP_RUNLOCK(inp);
611 }
612 }
613 }
614 (void)in6_pcbnotify(pcbinfo, sa, uh.uh_dport,
615 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd,
616 cmdarg, notify);
617 } else
618 (void)in6_pcbnotify(pcbinfo, sa, 0,
619 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
620 }
621
622 void
623 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
624 {
625
626 return (udp6_common_ctlinput(cmd, sa, d, &V_udbinfo));
627 }
628
629 void
630 udplite6_ctlinput(int cmd, struct sockaddr *sa, void *d)
631 {
632
633 return (udp6_common_ctlinput(cmd, sa, d, &V_ulitecbinfo));
634 }
635
636 static int
637 udp6_getcred(SYSCTL_HANDLER_ARGS)
638 {
639 struct xucred xuc;
640 struct sockaddr_in6 addrs[2];
641 struct inpcb *inp;
642 int error;
643
644 error = priv_check(req->td, PRIV_NETINET_GETCRED);
645 if (error)
646 return (error);
647
648 if (req->newlen != sizeof(addrs))
649 return (EINVAL);
650 if (req->oldlen != sizeof(struct xucred))
651 return (EINVAL);
652 error = SYSCTL_IN(req, addrs, sizeof(addrs));
653 if (error)
654 return (error);
655 if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 ||
656 (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) {
657 return (error);
658 }
659 inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr,
660 addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port,
661 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
662 if (inp != NULL) {
663 INP_RLOCK_ASSERT(inp);
664 if (inp->inp_socket == NULL)
665 error = ENOENT;
666 if (error == 0)
667 error = cr_canseesocket(req->td->td_ucred,
668 inp->inp_socket);
669 if (error == 0)
670 cru2x(inp->inp_cred, &xuc);
671 INP_RUNLOCK(inp);
672 } else
673 error = ENOENT;
674 if (error == 0)
675 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
676 return (error);
677 }
678
679 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0,
680 0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection");
681
682 #define UH_WLOCKED 2
683 #define UH_RLOCKED 1
684 #define UH_UNLOCKED 0
685 static int
686 udp6_output(struct socket *so, int flags_arg, struct mbuf *m,
687 struct sockaddr *addr6, struct mbuf *control, struct thread *td)
688 {
689 struct inpcbinfo *pcbinfo;
690 struct inpcb *inp;
691 struct ip6_hdr *ip6;
692 struct udphdr *udp6;
693 struct in6_addr *laddr, *faddr, in6a;
694 struct ip6_pktopts *optp, opt;
695 struct sockaddr_in6 *sin6, tmp;
696 struct epoch_tracker et;
697 int cscov_partial, error, flags, hlen, scope_ambiguous;
698 u_int32_t ulen, plen;
699 uint16_t cscov;
700 u_short fport;
701 uint8_t nxt, unlock_inp, unlock_udbinfo;
702
703 /* addr6 has been validated in udp6_send(). */
704 sin6 = (struct sockaddr_in6 *)addr6;
705
706 /*
707 * In contrast to to IPv4 we do not validate the max. packet length
708 * here due to IPv6 Jumbograms (RFC2675).
709 */
710
711 scope_ambiguous = 0;
712 if (sin6) {
713 /* Protect *addr6 from overwrites. */
714 tmp = *sin6;
715 sin6 = &tmp;
716
717 /*
718 * Application should provide a proper zone ID or the use of
719 * default zone IDs should be enabled. Unfortunately, some
720 * applications do not behave as it should, so we need a
721 * workaround. Even if an appropriate ID is not determined,
722 * we'll see if we can determine the outgoing interface. If we
723 * can, determine the zone ID based on the interface below.
724 */
725 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone)
726 scope_ambiguous = 1;
727 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0) {
728 if (control)
729 m_freem(control);
730 m_freem(m);
731 return (error);
732 }
733 }
734
735 inp = sotoinpcb(so);
736 KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
737 /*
738 * In the following cases we want a write lock on the inp for either
739 * local operations or for possible route cache updates in the IPv6
740 * output path:
741 * - on connected sockets (sin6 is NULL) for route cache updates,
742 * - when we are not bound to an address and source port (it is
743 * in6_pcbsetport() which will require the write lock).
744 */
745 if (sin6 == NULL || (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
746 inp->inp_lport == 0)) {
747 INP_WLOCK(inp);
748 unlock_inp = UH_WLOCKED;
749 } else {
750 INP_RLOCK(inp);
751 unlock_inp = UH_RLOCKED;
752 }
753 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
754 IPPROTO_UDP : IPPROTO_UDPLITE;
755
756 #ifdef INET
757 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
758 int hasv4addr;
759
760 if (sin6 == NULL)
761 hasv4addr = (inp->inp_vflag & INP_IPV4);
762 else
763 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
764 ? 1 : 0;
765 if (hasv4addr) {
766 struct pr_usrreqs *pru;
767
768 /*
769 * XXXRW: We release UDP-layer locks before calling
770 * udp_send() in order to avoid recursion. However,
771 * this does mean there is a short window where inp's
772 * fields are unstable. Could this lead to a
773 * potential race in which the factors causing us to
774 * select the UDPv4 output routine are invalidated?
775 */
776 if (unlock_inp == UH_WLOCKED)
777 INP_WUNLOCK(inp);
778 else
779 INP_RUNLOCK(inp);
780 if (sin6)
781 in6_sin6_2_sin_in_sock((struct sockaddr *)sin6);
782 pru = inetsw[ip_protox[nxt]].pr_usrreqs;
783 /* addr will just be freed in sendit(). */
784 return ((*pru->pru_send)(so, flags_arg, m,
785 (struct sockaddr *)sin6, control, td));
786 }
787 } else
788 #endif
789 if (sin6 && IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
790 /*
791 * Given this is either an IPv6-only socket or no INET is
792 * supported we will fail the send if the given destination
793 * address is a v4mapped address.
794 */
795 if (unlock_inp == UH_WLOCKED)
796 INP_WUNLOCK(inp);
797 else
798 INP_RUNLOCK(inp);
799 return (EINVAL);
800 }
801
802 if (control) {
803 if ((error = ip6_setpktopts(control, &opt,
804 inp->in6p_outputopts, td->td_ucred, nxt)) != 0) {
805 if (unlock_inp == UH_WLOCKED)
806 INP_WUNLOCK(inp);
807 else
808 INP_RUNLOCK(inp);
809 ip6_clearpktopts(&opt, -1);
810 if (control)
811 m_freem(control);
812 m_freem(m);
813 return (error);
814 }
815 optp = &opt;
816 } else
817 optp = inp->in6p_outputopts;
818
819 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
820 if (sin6 != NULL &&
821 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && inp->inp_lport == 0) {
822 INP_HASH_WLOCK(pcbinfo);
823 unlock_udbinfo = UH_WLOCKED;
824 } else if (sin6 != NULL &&
825 (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) ||
826 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) ||
827 inp->inp_lport == 0)) {
828 INP_HASH_RLOCK_ET(pcbinfo, et);
829 unlock_udbinfo = UH_RLOCKED;
830 } else
831 unlock_udbinfo = UH_UNLOCKED;
832
833 if (sin6) {
834
835 /*
836 * Since we saw no essential reason for calling in_pcbconnect,
837 * we get rid of such kind of logic, and call in6_selectsrc
838 * and in6_pcbsetport in order to fill in the local address
839 * and the local port.
840 */
841 if (sin6->sin6_port == 0) {
842 error = EADDRNOTAVAIL;
843 goto release;
844 }
845
846 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
847 /* how about ::ffff:0.0.0.0 case? */
848 error = EISCONN;
849 goto release;
850 }
851
852 /*
853 * Given we handle the v4mapped case in the INET block above
854 * assert here that it must not happen anymore.
855 */
856 KASSERT(!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr),
857 ("%s: sin6(%p)->sin6_addr is v4mapped which we "
858 "should have handled.", __func__, sin6));
859
860 /* This only requires read-locking. */
861 error = in6_selectsrc_socket(sin6, optp, inp,
862 td->td_ucred, scope_ambiguous, &in6a, NULL);
863 if (error)
864 goto release;
865 laddr = &in6a;
866
867 if (inp->inp_lport == 0) {
868
869 INP_WLOCK_ASSERT(inp);
870 error = in6_pcbsetport(laddr, inp, td->td_ucred);
871 if (error != 0) {
872 /* Undo an address bind that may have occurred. */
873 inp->in6p_laddr = in6addr_any;
874 goto release;
875 }
876 }
877 faddr = &sin6->sin6_addr;
878 fport = sin6->sin6_port; /* allow 0 port */
879
880 } else {
881 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
882 error = ENOTCONN;
883 goto release;
884 }
885 laddr = &inp->in6p_laddr;
886 faddr = &inp->in6p_faddr;
887 fport = inp->inp_fport;
888 }
889
890 ulen = m->m_pkthdr.len;
891 plen = sizeof(struct udphdr) + ulen;
892 hlen = sizeof(struct ip6_hdr);
893
894 /*
895 * Calculate data length and get a mbuf
896 * for UDP and IP6 headers.
897 */
898 M_PREPEND(m, hlen + sizeof(struct udphdr), M_NOWAIT);
899 if (m == NULL) {
900 error = ENOBUFS;
901 goto release;
902 }
903
904 /*
905 * Stuff checksum and output datagram.
906 */
907 cscov = cscov_partial = 0;
908 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
909 udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */
910 udp6->uh_dport = fport;
911 if (nxt == IPPROTO_UDPLITE) {
912 struct udpcb *up;
913
914 up = intoudpcb(inp);
915 cscov = up->u_txcslen;
916 if (cscov >= plen)
917 cscov = 0;
918 udp6->uh_ulen = htons(cscov);
919 /*
920 * For UDP-Lite, checksum coverage length of zero means
921 * the entire UDPLite packet is covered by the checksum.
922 */
923 cscov_partial = (cscov == 0) ? 0 : 1;
924 } else if (plen <= 0xffff)
925 udp6->uh_ulen = htons((u_short)plen);
926 else
927 udp6->uh_ulen = 0;
928 udp6->uh_sum = 0;
929
930 ip6 = mtod(m, struct ip6_hdr *);
931 ip6->ip6_flow = inp->inp_flow & IPV6_FLOWINFO_MASK;
932 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
933 ip6->ip6_vfc |= IPV6_VERSION;
934 ip6->ip6_plen = htons((u_short)plen);
935 ip6->ip6_nxt = nxt;
936 ip6->ip6_hlim = in6_selecthlim(inp, NULL);
937 ip6->ip6_src = *laddr;
938 ip6->ip6_dst = *faddr;
939
940 #ifdef MAC
941 mac_inpcb_create_mbuf(inp, m);
942 #endif
943
944 if (cscov_partial) {
945 if ((udp6->uh_sum = in6_cksum_partial(m, nxt,
946 sizeof(struct ip6_hdr), plen, cscov)) == 0)
947 udp6->uh_sum = 0xffff;
948 } else {
949 udp6->uh_sum = in6_cksum_pseudo(ip6, plen, nxt, 0);
950 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6;
951 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
952 }
953
954 flags = 0;
955 #ifdef RSS
956 {
957 uint32_t hash_val, hash_type;
958 uint8_t pr;
959
960 pr = inp->inp_socket->so_proto->pr_protocol;
961 /*
962 * Calculate an appropriate RSS hash for UDP and
963 * UDP Lite.
964 *
965 * The called function will take care of figuring out
966 * whether a 2-tuple or 4-tuple hash is required based
967 * on the currently configured scheme.
968 *
969 * Later later on connected socket values should be
970 * cached in the inpcb and reused, rather than constantly
971 * re-calculating it.
972 *
973 * UDP Lite is a different protocol number and will
974 * likely end up being hashed as a 2-tuple until
975 * RSS / NICs grow UDP Lite protocol awareness.
976 */
977 if (rss_proto_software_hash_v6(faddr, laddr, fport,
978 inp->inp_lport, pr, &hash_val, &hash_type) == 0) {
979 m->m_pkthdr.flowid = hash_val;
980 M_HASHTYPE_SET(m, hash_type);
981 }
982
983 /*
984 * Don't override with the inp cached flowid.
985 *
986 * Until the whole UDP path is vetted, it may actually
987 * be incorrect.
988 */
989 flags |= IP_NODEFAULTFLOWID;
990 }
991 #endif
992
993 UDPSTAT_INC(udps_opackets);
994 if (unlock_udbinfo == UH_WLOCKED)
995 INP_HASH_WUNLOCK(pcbinfo);
996 else if (unlock_udbinfo == UH_RLOCKED)
997 INP_HASH_RUNLOCK_ET(pcbinfo, et);
998 if (nxt == IPPROTO_UDPLITE)
999 UDPLITE_PROBE(send, NULL, inp, ip6, inp, udp6);
1000 else
1001 UDP_PROBE(send, NULL, inp, ip6, inp, udp6);
1002 error = ip6_output(m, optp,
1003 (unlock_inp == UH_WLOCKED) ? &inp->inp_route6 : NULL, flags,
1004 inp->in6p_moptions, NULL, inp);
1005 if (unlock_inp == UH_WLOCKED)
1006 INP_WUNLOCK(inp);
1007 else
1008 INP_RUNLOCK(inp);
1009
1010 if (control) {
1011 ip6_clearpktopts(&opt, -1);
1012 m_freem(control);
1013 }
1014 return (error);
1015
1016 release:
1017 if (unlock_udbinfo == UH_WLOCKED) {
1018 KASSERT(unlock_inp == UH_WLOCKED, ("%s: excl udbinfo lock, "
1019 "non-excl inp lock: pcbinfo %p %#x inp %p %#x",
1020 __func__, pcbinfo, unlock_udbinfo, inp, unlock_inp));
1021 INP_HASH_WUNLOCK(pcbinfo);
1022 INP_WUNLOCK(inp);
1023 } else if (unlock_udbinfo == UH_RLOCKED) {
1024 KASSERT(unlock_inp == UH_RLOCKED, ("%s: non-excl udbinfo lock, "
1025 "excl inp lock: pcbinfo %p %#x inp %p %#x",
1026 __func__, pcbinfo, unlock_udbinfo, inp, unlock_inp));
1027 INP_HASH_RUNLOCK_ET(pcbinfo, et);
1028 INP_RUNLOCK(inp);
1029 } else if (unlock_inp == UH_WLOCKED)
1030 INP_WUNLOCK(inp);
1031 else
1032 INP_RUNLOCK(inp);
1033 if (control) {
1034 ip6_clearpktopts(&opt, -1);
1035 m_freem(control);
1036 }
1037 m_freem(m);
1038
1039 return (error);
1040 }
1041
1042 static void
1043 udp6_abort(struct socket *so)
1044 {
1045 struct inpcb *inp;
1046 struct inpcbinfo *pcbinfo;
1047
1048 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1049 inp = sotoinpcb(so);
1050 KASSERT(inp != NULL, ("udp6_abort: inp == NULL"));
1051
1052 INP_WLOCK(inp);
1053 #ifdef INET
1054 if (inp->inp_vflag & INP_IPV4) {
1055 struct pr_usrreqs *pru;
1056 uint8_t nxt;
1057
1058 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
1059 IPPROTO_UDP : IPPROTO_UDPLITE;
1060 INP_WUNLOCK(inp);
1061 pru = inetsw[ip_protox[nxt]].pr_usrreqs;
1062 (*pru->pru_abort)(so);
1063 return;
1064 }
1065 #endif
1066
1067 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1068 INP_HASH_WLOCK(pcbinfo);
1069 in6_pcbdisconnect(inp);
1070 inp->in6p_laddr = in6addr_any;
1071 INP_HASH_WUNLOCK(pcbinfo);
1072 soisdisconnected(so);
1073 }
1074 INP_WUNLOCK(inp);
1075 }
1076
1077 static int
1078 udp6_attach(struct socket *so, int proto, struct thread *td)
1079 {
1080 struct inpcb *inp;
1081 struct inpcbinfo *pcbinfo;
1082 int error;
1083
1084 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1085 inp = sotoinpcb(so);
1086 KASSERT(inp == NULL, ("udp6_attach: inp != NULL"));
1087
1088 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1089 error = soreserve(so, udp_sendspace, udp_recvspace);
1090 if (error)
1091 return (error);
1092 }
1093 INP_INFO_WLOCK(pcbinfo);
1094 error = in_pcballoc(so, pcbinfo);
1095 if (error) {
1096 INP_INFO_WUNLOCK(pcbinfo);
1097 return (error);
1098 }
1099 inp = (struct inpcb *)so->so_pcb;
1100 inp->inp_vflag |= INP_IPV6;
1101 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
1102 inp->inp_vflag |= INP_IPV4;
1103 inp->in6p_hops = -1; /* use kernel default */
1104 inp->in6p_cksum = -1; /* just to be sure */
1105 /*
1106 * XXX: ugly!!
1107 * IPv4 TTL initialization is necessary for an IPv6 socket as well,
1108 * because the socket may be bound to an IPv6 wildcard address,
1109 * which may match an IPv4-mapped IPv6 address.
1110 */
1111 inp->inp_ip_ttl = V_ip_defttl;
1112
1113 error = udp_newudpcb(inp);
1114 if (error) {
1115 in_pcbdetach(inp);
1116 in_pcbfree(inp);
1117 INP_INFO_WUNLOCK(pcbinfo);
1118 return (error);
1119 }
1120 INP_WUNLOCK(inp);
1121 INP_INFO_WUNLOCK(pcbinfo);
1122 return (0);
1123 }
1124
1125 static int
1126 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
1127 {
1128 struct inpcb *inp;
1129 struct inpcbinfo *pcbinfo;
1130 int error;
1131
1132 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1133 inp = sotoinpcb(so);
1134 KASSERT(inp != NULL, ("udp6_bind: inp == NULL"));
1135
1136 INP_WLOCK(inp);
1137 INP_HASH_WLOCK(pcbinfo);
1138 inp->inp_vflag &= ~INP_IPV4;
1139 inp->inp_vflag |= INP_IPV6;
1140 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
1141 struct sockaddr_in6 *sin6_p;
1142
1143 sin6_p = (struct sockaddr_in6 *)nam;
1144
1145 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
1146 inp->inp_vflag |= INP_IPV4;
1147 #ifdef INET
1148 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
1149 struct sockaddr_in sin;
1150
1151 in6_sin6_2_sin(&sin, sin6_p);
1152 inp->inp_vflag |= INP_IPV4;
1153 inp->inp_vflag &= ~INP_IPV6;
1154 error = in_pcbbind(inp, (struct sockaddr *)&sin,
1155 td->td_ucred);
1156 goto out;
1157 }
1158 #endif
1159 }
1160
1161 error = in6_pcbbind(inp, nam, td->td_ucred);
1162 #ifdef INET
1163 out:
1164 #endif
1165 INP_HASH_WUNLOCK(pcbinfo);
1166 INP_WUNLOCK(inp);
1167 return (error);
1168 }
1169
1170 static void
1171 udp6_close(struct socket *so)
1172 {
1173 struct inpcb *inp;
1174 struct inpcbinfo *pcbinfo;
1175
1176 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1177 inp = sotoinpcb(so);
1178 KASSERT(inp != NULL, ("udp6_close: inp == NULL"));
1179
1180 INP_WLOCK(inp);
1181 #ifdef INET
1182 if (inp->inp_vflag & INP_IPV4) {
1183 struct pr_usrreqs *pru;
1184 uint8_t nxt;
1185
1186 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
1187 IPPROTO_UDP : IPPROTO_UDPLITE;
1188 INP_WUNLOCK(inp);
1189 pru = inetsw[ip_protox[nxt]].pr_usrreqs;
1190 (*pru->pru_disconnect)(so);
1191 return;
1192 }
1193 #endif
1194 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1195 INP_HASH_WLOCK(pcbinfo);
1196 in6_pcbdisconnect(inp);
1197 inp->in6p_laddr = in6addr_any;
1198 INP_HASH_WUNLOCK(pcbinfo);
1199 soisdisconnected(so);
1200 }
1201 INP_WUNLOCK(inp);
1202 }
1203
1204 static int
1205 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1206 {
1207 struct inpcb *inp;
1208 struct inpcbinfo *pcbinfo;
1209 struct sockaddr_in6 *sin6;
1210 int error;
1211
1212 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1213 inp = sotoinpcb(so);
1214 sin6 = (struct sockaddr_in6 *)nam;
1215 KASSERT(inp != NULL, ("udp6_connect: inp == NULL"));
1216
1217 /*
1218 * XXXRW: Need to clarify locking of v4/v6 flags.
1219 */
1220 INP_WLOCK(inp);
1221 #ifdef INET
1222 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
1223 struct sockaddr_in sin;
1224
1225 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
1226 error = EINVAL;
1227 goto out;
1228 }
1229 if ((inp->inp_vflag & INP_IPV4) == 0) {
1230 error = EAFNOSUPPORT;
1231 goto out;
1232 }
1233 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1234 error = EISCONN;
1235 goto out;
1236 }
1237 in6_sin6_2_sin(&sin, sin6);
1238 inp->inp_vflag |= INP_IPV4;
1239 inp->inp_vflag &= ~INP_IPV6;
1240 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr);
1241 if (error != 0)
1242 goto out;
1243 INP_HASH_WLOCK(pcbinfo);
1244 error = in_pcbconnect(inp, (struct sockaddr *)&sin,
1245 td->td_ucred);
1246 INP_HASH_WUNLOCK(pcbinfo);
1247 if (error == 0)
1248 soisconnected(so);
1249 goto out;
1250 } else {
1251 if ((inp->inp_vflag & INP_IPV6) == 0) {
1252 error = EAFNOSUPPORT;
1253 goto out;
1254 }
1255 }
1256 #endif
1257 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1258 error = EISCONN;
1259 goto out;
1260 }
1261 inp->inp_vflag &= ~INP_IPV4;
1262 inp->inp_vflag |= INP_IPV6;
1263 error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr);
1264 if (error != 0)
1265 goto out;
1266 INP_HASH_WLOCK(pcbinfo);
1267 error = in6_pcbconnect(inp, nam, td->td_ucred);
1268 INP_HASH_WUNLOCK(pcbinfo);
1269 if (error == 0)
1270 soisconnected(so);
1271 out:
1272 INP_WUNLOCK(inp);
1273 return (error);
1274 }
1275
1276 static void
1277 udp6_detach(struct socket *so)
1278 {
1279 struct inpcb *inp;
1280 struct inpcbinfo *pcbinfo;
1281 struct udpcb *up;
1282
1283 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1284 inp = sotoinpcb(so);
1285 KASSERT(inp != NULL, ("udp6_detach: inp == NULL"));
1286
1287 INP_INFO_WLOCK(pcbinfo);
1288 INP_WLOCK(inp);
1289 up = intoudpcb(inp);
1290 KASSERT(up != NULL, ("%s: up == NULL", __func__));
1291 in_pcbdetach(inp);
1292 in_pcbfree(inp);
1293 INP_INFO_WUNLOCK(pcbinfo);
1294 udp_discardcb(up);
1295 }
1296
1297 static int
1298 udp6_disconnect(struct socket *so)
1299 {
1300 struct inpcb *inp;
1301 struct inpcbinfo *pcbinfo;
1302
1303 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1304 inp = sotoinpcb(so);
1305 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL"));
1306
1307 INP_WLOCK(inp);
1308 #ifdef INET
1309 if (inp->inp_vflag & INP_IPV4) {
1310 struct pr_usrreqs *pru;
1311 uint8_t nxt;
1312
1313 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
1314 IPPROTO_UDP : IPPROTO_UDPLITE;
1315 INP_WUNLOCK(inp);
1316 pru = inetsw[ip_protox[nxt]].pr_usrreqs;
1317 (void)(*pru->pru_disconnect)(so);
1318 return (0);
1319 }
1320 #endif
1321
1322 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1323 INP_WUNLOCK(inp);
1324 return (ENOTCONN);
1325 }
1326
1327 INP_HASH_WLOCK(pcbinfo);
1328 in6_pcbdisconnect(inp);
1329 inp->in6p_laddr = in6addr_any;
1330 INP_HASH_WUNLOCK(pcbinfo);
1331 SOCK_LOCK(so);
1332 so->so_state &= ~SS_ISCONNECTED; /* XXX */
1333 SOCK_UNLOCK(so);
1334 INP_WUNLOCK(inp);
1335 return (0);
1336 }
1337
1338 static int
1339 udp6_send(struct socket *so, int flags, struct mbuf *m,
1340 struct sockaddr *addr, struct mbuf *control, struct thread *td)
1341 {
1342 int error;
1343
1344 if (addr) {
1345 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
1346 error = EINVAL;
1347 goto bad;
1348 }
1349 if (addr->sa_family != AF_INET6) {
1350 error = EAFNOSUPPORT;
1351 goto bad;
1352 }
1353 }
1354
1355 return (udp6_output(so, flags, m, addr, control, td));
1356
1357 bad:
1358 if (control)
1359 m_freem(control);
1360 m_freem(m);
1361 return (error);
1362 }
1363
1364 struct pr_usrreqs udp6_usrreqs = {
1365 .pru_abort = udp6_abort,
1366 .pru_attach = udp6_attach,
1367 .pru_bind = udp6_bind,
1368 .pru_connect = udp6_connect,
1369 .pru_control = in6_control,
1370 .pru_detach = udp6_detach,
1371 .pru_disconnect = udp6_disconnect,
1372 .pru_peeraddr = in6_mapped_peeraddr,
1373 .pru_send = udp6_send,
1374 .pru_shutdown = udp_shutdown,
1375 .pru_sockaddr = in6_mapped_sockaddr,
1376 .pru_soreceive = soreceive_dgram,
1377 .pru_sosend = sosend_dgram,
1378 .pru_sosetlabel = in_pcbsosetlabel,
1379 .pru_close = udp6_close
1380 };
Cache object: b8376a4832ee0a0512ae96d26d9bd85a
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