1 /*-
2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
3 * Copyright (c) 2010-2011 Juniper Networks, Inc.
4 * Copyright (c) 2014 Kevin Lo
5 * All rights reserved.
6 *
7 * Portions of this software were developed by Robert N. M. Watson under
8 * contract to Juniper Networks, Inc.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the project nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $
35 * $KAME: udp6_output.c,v 1.31 2001/05/21 16:39:15 jinmei Exp $
36 */
37
38 /*-
39 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
40 * The Regents of the University of California.
41 * All rights reserved.
42 *
43 * Redistribution and use in source and binary forms, with or without
44 * modification, are permitted provided that the following conditions
45 * are met:
46 * 1. Redistributions of source code must retain the above copyright
47 * notice, this list of conditions and the following disclaimer.
48 * 2. Redistributions in binary form must reproduce the above copyright
49 * notice, this list of conditions and the following disclaimer in the
50 * documentation and/or other materials provided with the distribution.
51 * 4. Neither the name of the University nor the names of its contributors
52 * may be used to endorse or promote products derived from this software
53 * without specific prior written permission.
54 *
55 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
56 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
57 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
58 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
59 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
60 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
61 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
62 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
63 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
65 * SUCH DAMAGE.
66 *
67 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95
68 */
69
70 #include <sys/cdefs.h>
71 __FBSDID("$FreeBSD: releng/11.2/sys/netinet6/udp6_usrreq.c 338980 2018-09-27 18:34:42Z gordon $");
72
73 #include "opt_inet.h"
74 #include "opt_inet6.h"
75 #include "opt_ipsec.h"
76 #include "opt_rss.h"
77
78 #include <sys/param.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/ip6protosw.h>
115 #include <netinet6/ip6_var.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 /*
126 * UDP protocol implementation.
127 * Per RFC 768, August, 1980.
128 */
129
130 extern struct protosw inetsw[];
131 static void udp6_detach(struct socket *so);
132
133 static int
134 udp6_append(struct inpcb *inp, struct mbuf *n, int off,
135 struct sockaddr_in6 *fromsa)
136 {
137 struct socket *so;
138 struct mbuf *opts;
139 struct udpcb *up;
140
141 INP_LOCK_ASSERT(inp);
142
143 /*
144 * Engage the tunneling protocol.
145 */
146 up = intoudpcb(inp);
147 if (up->u_tun_func != NULL) {
148 in_pcbref(inp);
149 INP_RUNLOCK(inp);
150 (*up->u_tun_func)(n, off, inp, (struct sockaddr *)fromsa,
151 up->u_tun_ctx);
152 INP_RLOCK(inp);
153 return (in_pcbrele_rlocked(inp));
154 }
155 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
156 /* Check AH/ESP integrity. */
157 if (IPSEC_ENABLED(ipv6)) {
158 if (IPSEC_CHECK_POLICY(ipv6, n, inp) != 0) {
159 m_freem(n);
160 return (0);
161 }
162 }
163 #endif /* IPSEC */
164 #ifdef MAC
165 if (mac_inpcb_check_deliver(inp, n) != 0) {
166 m_freem(n);
167 return (0);
168 }
169 #endif
170 opts = NULL;
171 if (inp->inp_flags & INP_CONTROLOPTS ||
172 inp->inp_socket->so_options & SO_TIMESTAMP)
173 ip6_savecontrol(inp, n, &opts);
174 m_adj(n, off + sizeof(struct udphdr));
175
176 so = inp->inp_socket;
177 SOCKBUF_LOCK(&so->so_rcv);
178 if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)fromsa, n,
179 opts) == 0) {
180 SOCKBUF_UNLOCK(&so->so_rcv);
181 m_freem(n);
182 if (opts)
183 m_freem(opts);
184 UDPSTAT_INC(udps_fullsock);
185 } else
186 sorwakeup_locked(so);
187 return (0);
188 }
189
190 int
191 udp6_input(struct mbuf **mp, int *offp, int proto)
192 {
193 struct mbuf *m = *mp;
194 struct ifnet *ifp;
195 struct ip6_hdr *ip6;
196 struct udphdr *uh;
197 struct inpcb *inp;
198 struct inpcbinfo *pcbinfo;
199 struct udpcb *up;
200 int off = *offp;
201 int cscov_partial;
202 int plen, ulen;
203 struct sockaddr_in6 fromsa;
204 struct m_tag *fwd_tag;
205 uint16_t uh_sum;
206 uint8_t nxt;
207
208 ifp = m->m_pkthdr.rcvif;
209
210 #ifndef PULLDOWN_TEST
211 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
212 ip6 = mtod(m, struct ip6_hdr *);
213 uh = (struct udphdr *)((caddr_t)ip6 + off);
214 #else
215 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh));
216 if (!uh)
217 return (IPPROTO_DONE);
218 ip6 = mtod(m, struct ip6_hdr *);
219 #endif
220
221 UDPSTAT_INC(udps_ipackets);
222
223 /*
224 * Destination port of 0 is illegal, based on RFC768.
225 */
226 if (uh->uh_dport == 0)
227 goto badunlocked;
228
229 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
230 ulen = ntohs((u_short)uh->uh_ulen);
231
232 nxt = proto;
233 cscov_partial = (nxt == IPPROTO_UDPLITE) ? 1 : 0;
234 if (nxt == IPPROTO_UDPLITE) {
235 /* Zero means checksum over the complete packet. */
236 if (ulen == 0)
237 ulen = plen;
238 if (ulen == plen)
239 cscov_partial = 0;
240 if ((ulen < sizeof(struct udphdr)) || (ulen > plen)) {
241 /* XXX: What is the right UDPLite MIB counter? */
242 goto badunlocked;
243 }
244 if (uh->uh_sum == 0) {
245 /* XXX: What is the right UDPLite MIB counter? */
246 goto badunlocked;
247 }
248 } else {
249 if ((ulen < sizeof(struct udphdr)) || (plen != ulen)) {
250 UDPSTAT_INC(udps_badlen);
251 goto badunlocked;
252 }
253 if (uh->uh_sum == 0) {
254 UDPSTAT_INC(udps_nosum);
255 goto badunlocked;
256 }
257 }
258
259 if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID_IPV6) &&
260 !cscov_partial) {
261 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
262 uh_sum = m->m_pkthdr.csum_data;
263 else
264 uh_sum = in6_cksum_pseudo(ip6, ulen, nxt,
265 m->m_pkthdr.csum_data);
266 uh_sum ^= 0xffff;
267 } else
268 uh_sum = in6_cksum_partial(m, nxt, off, plen, ulen);
269
270 if (uh_sum != 0) {
271 UDPSTAT_INC(udps_badsum);
272 goto badunlocked;
273 }
274
275 /*
276 * Construct sockaddr format source address.
277 */
278 init_sin6(&fromsa, m);
279 fromsa.sin6_port = uh->uh_sport;
280
281 pcbinfo = udp_get_inpcbinfo(nxt);
282 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
283 struct inpcb *last;
284 struct inpcbhead *pcblist;
285 struct ip6_moptions *imo;
286
287 INP_INFO_RLOCK(pcbinfo);
288 /*
289 * In the event that laddr should be set to the link-local
290 * address (this happens in RIPng), the multicast address
291 * specified in the received packet will not match laddr. To
292 * handle this situation, matching is relaxed if the
293 * receiving interface is the same as one specified in the
294 * socket and if the destination multicast address matches
295 * one of the multicast groups specified in the socket.
296 */
297
298 /*
299 * KAME note: traditionally we dropped udpiphdr from mbuf
300 * here. We need udphdr for IPsec processing so we do that
301 * later.
302 */
303 pcblist = udp_get_pcblist(nxt);
304 last = NULL;
305 LIST_FOREACH(inp, pcblist, inp_list) {
306 if ((inp->inp_vflag & INP_IPV6) == 0)
307 continue;
308 if (inp->inp_lport != uh->uh_dport)
309 continue;
310 if (inp->inp_fport != 0 &&
311 inp->inp_fport != uh->uh_sport)
312 continue;
313 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
314 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
315 &ip6->ip6_dst))
316 continue;
317 }
318 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
319 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
320 &ip6->ip6_src) ||
321 inp->inp_fport != uh->uh_sport)
322 continue;
323 }
324
325 /*
326 * XXXRW: Because we weren't holding either the inpcb
327 * or the hash lock when we checked for a match
328 * before, we should probably recheck now that the
329 * inpcb lock is (supposed to be) held.
330 */
331
332 /*
333 * Handle socket delivery policy for any-source
334 * and source-specific multicast. [RFC3678]
335 */
336 imo = inp->in6p_moptions;
337 if (imo && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
338 struct sockaddr_in6 mcaddr;
339 int blocked;
340
341 INP_RLOCK(inp);
342
343 bzero(&mcaddr, sizeof(struct sockaddr_in6));
344 mcaddr.sin6_len = sizeof(struct sockaddr_in6);
345 mcaddr.sin6_family = AF_INET6;
346 mcaddr.sin6_addr = ip6->ip6_dst;
347
348 blocked = im6o_mc_filter(imo, ifp,
349 (struct sockaddr *)&mcaddr,
350 (struct sockaddr *)&fromsa);
351 if (blocked != MCAST_PASS) {
352 if (blocked == MCAST_NOTGMEMBER)
353 IP6STAT_INC(ip6s_notmember);
354 if (blocked == MCAST_NOTSMEMBER ||
355 blocked == MCAST_MUTED)
356 UDPSTAT_INC(udps_filtermcast);
357 INP_RUNLOCK(inp); /* XXX */
358 continue;
359 }
360
361 INP_RUNLOCK(inp);
362 }
363 if (last != NULL) {
364 struct mbuf *n;
365
366 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
367 INP_RLOCK(last);
368 UDP_PROBE(receive, NULL, last, ip6,
369 last, uh);
370 if (udp6_append(last, n, off, &fromsa))
371 goto inp_lost;
372 INP_RUNLOCK(last);
373 }
374 }
375 last = inp;
376 /*
377 * Don't look for additional matches if this one does
378 * not have either the SO_REUSEPORT or SO_REUSEADDR
379 * socket options set. This heuristic avoids
380 * searching through all pcbs in the common case of a
381 * non-shared port. It assumes that an application
382 * will never clear these options after setting them.
383 */
384 if ((last->inp_socket->so_options &
385 (SO_REUSEPORT|SO_REUSEADDR)) == 0)
386 break;
387 }
388
389 if (last == NULL) {
390 /*
391 * No matching pcb found; discard datagram. (No need
392 * to send an ICMP Port Unreachable for a broadcast
393 * or multicast datgram.)
394 */
395 UDPSTAT_INC(udps_noport);
396 UDPSTAT_INC(udps_noportmcast);
397 goto badheadlocked;
398 }
399 INP_RLOCK(last);
400 INP_INFO_RUNLOCK(pcbinfo);
401 UDP_PROBE(receive, NULL, last, ip6, last, uh);
402 if (udp6_append(last, m, off, &fromsa) == 0)
403 INP_RUNLOCK(last);
404 inp_lost:
405 return (IPPROTO_DONE);
406 }
407 /*
408 * Locate pcb for datagram.
409 */
410
411 /*
412 * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
413 */
414 if ((m->m_flags & M_IP6_NEXTHOP) &&
415 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
416 struct sockaddr_in6 *next_hop6;
417
418 next_hop6 = (struct sockaddr_in6 *)(fwd_tag + 1);
419
420 /*
421 * Transparently forwarded. Pretend to be the destination.
422 * Already got one like this?
423 */
424 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src,
425 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
426 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif, m);
427 if (!inp) {
428 /*
429 * It's new. Try to find the ambushing socket.
430 * Because we've rewritten the destination address,
431 * any hardware-generated hash is ignored.
432 */
433 inp = in6_pcblookup(pcbinfo, &ip6->ip6_src,
434 uh->uh_sport, &next_hop6->sin6_addr,
435 next_hop6->sin6_port ? htons(next_hop6->sin6_port) :
436 uh->uh_dport, INPLOOKUP_WILDCARD |
437 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif);
438 }
439 /* Remove the tag from the packet. We don't need it anymore. */
440 m_tag_delete(m, fwd_tag);
441 m->m_flags &= ~M_IP6_NEXTHOP;
442 } else
443 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src,
444 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
445 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB,
446 m->m_pkthdr.rcvif, m);
447 if (inp == NULL) {
448 if (udp_log_in_vain) {
449 char ip6bufs[INET6_ADDRSTRLEN];
450 char ip6bufd[INET6_ADDRSTRLEN];
451
452 log(LOG_INFO,
453 "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
454 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
455 ntohs(uh->uh_dport),
456 ip6_sprintf(ip6bufs, &ip6->ip6_src),
457 ntohs(uh->uh_sport));
458 }
459 UDPSTAT_INC(udps_noport);
460 if (m->m_flags & M_MCAST) {
461 printf("UDP6: M_MCAST is set in a unicast packet.\n");
462 UDPSTAT_INC(udps_noportmcast);
463 goto badunlocked;
464 }
465 if (V_udp_blackhole)
466 goto badunlocked;
467 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
468 return (IPPROTO_DONE);
469 }
470 INP_RLOCK_ASSERT(inp);
471 up = intoudpcb(inp);
472 if (cscov_partial) {
473 if (up->u_rxcslen == 0 || up->u_rxcslen > ulen) {
474 INP_RUNLOCK(inp);
475 m_freem(m);
476 return (IPPROTO_DONE);
477 }
478 }
479 UDP_PROBE(receive, NULL, inp, ip6, inp, uh);
480 if (udp6_append(inp, m, off, &fromsa) == 0)
481 INP_RUNLOCK(inp);
482 return (IPPROTO_DONE);
483
484 badheadlocked:
485 INP_INFO_RUNLOCK(pcbinfo);
486 badunlocked:
487 if (m)
488 m_freem(m);
489 return (IPPROTO_DONE);
490 }
491
492 static void
493 udp6_common_ctlinput(int cmd, struct sockaddr *sa, void *d,
494 struct inpcbinfo *pcbinfo)
495 {
496 struct udphdr uh;
497 struct ip6_hdr *ip6;
498 struct mbuf *m;
499 int off = 0;
500 struct ip6ctlparam *ip6cp = NULL;
501 const struct sockaddr_in6 *sa6_src = NULL;
502 void *cmdarg;
503 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify;
504 struct udp_portonly {
505 u_int16_t uh_sport;
506 u_int16_t uh_dport;
507 } *uhp;
508
509 if (sa->sa_family != AF_INET6 ||
510 sa->sa_len != sizeof(struct sockaddr_in6))
511 return;
512
513 if ((unsigned)cmd >= PRC_NCMDS)
514 return;
515 if (PRC_IS_REDIRECT(cmd))
516 notify = in6_rtchange, d = NULL;
517 else if (cmd == PRC_HOSTDEAD)
518 d = NULL;
519 else if (inet6ctlerrmap[cmd] == 0)
520 return;
521
522 /* if the parameter is from icmp6, decode it. */
523 if (d != NULL) {
524 ip6cp = (struct ip6ctlparam *)d;
525 m = ip6cp->ip6c_m;
526 ip6 = ip6cp->ip6c_ip6;
527 off = ip6cp->ip6c_off;
528 cmdarg = ip6cp->ip6c_cmdarg;
529 sa6_src = ip6cp->ip6c_src;
530 } else {
531 m = NULL;
532 ip6 = NULL;
533 cmdarg = NULL;
534 sa6_src = &sa6_any;
535 }
536
537 if (ip6) {
538 /*
539 * XXX: We assume that when IPV6 is non NULL,
540 * M and OFF are valid.
541 */
542
543 /* Check if we can safely examine src and dst ports. */
544 if (m->m_pkthdr.len < off + sizeof(*uhp))
545 return;
546
547 bzero(&uh, sizeof(uh));
548 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
549
550 if (!PRC_IS_REDIRECT(cmd)) {
551 /* Check to see if its tunneled */
552 struct inpcb *inp;
553 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_dst,
554 uh.uh_dport, &ip6->ip6_src, uh.uh_sport,
555 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB,
556 m->m_pkthdr.rcvif, m);
557 if (inp != NULL) {
558 struct udpcb *up;
559
560 up = intoudpcb(inp);
561 if (up->u_icmp_func) {
562 /* Yes it is. */
563 INP_RUNLOCK(inp);
564 (*up->u_icmp_func)(cmd, (struct sockaddr *)ip6cp->ip6c_src,
565 d, up->u_tun_ctx);
566 return;
567 } else {
568 /* Can't find it. */
569 INP_RUNLOCK(inp);
570 }
571 }
572 }
573 (void)in6_pcbnotify(pcbinfo, sa, uh.uh_dport,
574 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd,
575 cmdarg, notify);
576 } else
577 (void)in6_pcbnotify(pcbinfo, sa, 0,
578 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
579 }
580
581 void
582 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
583 {
584
585 return (udp6_common_ctlinput(cmd, sa, d, &V_udbinfo));
586 }
587
588 void
589 udplite6_ctlinput(int cmd, struct sockaddr *sa, void *d)
590 {
591
592 return (udp6_common_ctlinput(cmd, sa, d, &V_ulitecbinfo));
593 }
594
595 static int
596 udp6_getcred(SYSCTL_HANDLER_ARGS)
597 {
598 struct xucred xuc;
599 struct sockaddr_in6 addrs[2];
600 struct inpcb *inp;
601 int error;
602
603 error = priv_check(req->td, PRIV_NETINET_GETCRED);
604 if (error)
605 return (error);
606
607 if (req->newlen != sizeof(addrs))
608 return (EINVAL);
609 if (req->oldlen != sizeof(struct xucred))
610 return (EINVAL);
611 error = SYSCTL_IN(req, addrs, sizeof(addrs));
612 if (error)
613 return (error);
614 if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 ||
615 (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) {
616 return (error);
617 }
618 inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr,
619 addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port,
620 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
621 if (inp != NULL) {
622 INP_RLOCK_ASSERT(inp);
623 if (inp->inp_socket == NULL)
624 error = ENOENT;
625 if (error == 0)
626 error = cr_canseesocket(req->td->td_ucred,
627 inp->inp_socket);
628 if (error == 0)
629 cru2x(inp->inp_cred, &xuc);
630 INP_RUNLOCK(inp);
631 } else
632 error = ENOENT;
633 if (error == 0)
634 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
635 return (error);
636 }
637
638 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0,
639 0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection");
640
641 static int
642 udp6_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr6,
643 struct mbuf *control, struct thread *td)
644 {
645 u_int32_t ulen = m->m_pkthdr.len;
646 u_int32_t plen = sizeof(struct udphdr) + ulen;
647 struct ip6_hdr *ip6;
648 struct udphdr *udp6;
649 struct in6_addr *laddr, *faddr, in6a;
650 struct sockaddr_in6 *sin6 = NULL;
651 int cscov_partial = 0;
652 int scope_ambiguous = 0;
653 u_short fport;
654 int error = 0;
655 uint8_t nxt;
656 uint16_t cscov = 0;
657 struct ip6_pktopts *optp, opt;
658 int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
659 int flags;
660 struct sockaddr_in6 tmp;
661
662 INP_WLOCK_ASSERT(inp);
663 INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
664
665 if (addr6) {
666 /* addr6 has been validated in udp6_send(). */
667 sin6 = (struct sockaddr_in6 *)addr6;
668
669 /* protect *sin6 from overwrites */
670 tmp = *sin6;
671 sin6 = &tmp;
672
673 /*
674 * Application should provide a proper zone ID or the use of
675 * default zone IDs should be enabled. Unfortunately, some
676 * applications do not behave as it should, so we need a
677 * workaround. Even if an appropriate ID is not determined,
678 * we'll see if we can determine the outgoing interface. If we
679 * can, determine the zone ID based on the interface below.
680 */
681 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone)
682 scope_ambiguous = 1;
683 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
684 return (error);
685 }
686
687 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
688 IPPROTO_UDP : IPPROTO_UDPLITE;
689 if (control) {
690 if ((error = ip6_setpktopts(control, &opt,
691 inp->in6p_outputopts, td->td_ucred, nxt)) != 0)
692 goto release;
693 optp = &opt;
694 } else
695 optp = inp->in6p_outputopts;
696
697 if (sin6) {
698 faddr = &sin6->sin6_addr;
699
700 /*
701 * Since we saw no essential reason for calling in_pcbconnect,
702 * we get rid of such kind of logic, and call in6_selectsrc
703 * and in6_pcbsetport in order to fill in the local address
704 * and the local port.
705 */
706 if (sin6->sin6_port == 0) {
707 error = EADDRNOTAVAIL;
708 goto release;
709 }
710
711 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
712 /* how about ::ffff:0.0.0.0 case? */
713 error = EISCONN;
714 goto release;
715 }
716
717 fport = sin6->sin6_port; /* allow 0 port */
718
719 if (IN6_IS_ADDR_V4MAPPED(faddr)) {
720 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
721 /*
722 * I believe we should explicitly discard the
723 * packet when mapped addresses are disabled,
724 * rather than send the packet as an IPv6 one.
725 * If we chose the latter approach, the packet
726 * might be sent out on the wire based on the
727 * default route, the situation which we'd
728 * probably want to avoid.
729 * (20010421 jinmei@kame.net)
730 */
731 error = EINVAL;
732 goto release;
733 }
734 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
735 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) {
736 /*
737 * when remote addr is an IPv4-mapped address,
738 * local addr should not be an IPv6 address,
739 * since you cannot determine how to map IPv6
740 * source address to IPv4.
741 */
742 error = EINVAL;
743 goto release;
744 }
745
746 af = AF_INET;
747 }
748
749 if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
750 error = in6_selectsrc_socket(sin6, optp, inp,
751 td->td_ucred, scope_ambiguous, &in6a, NULL);
752 if (error)
753 goto release;
754 laddr = &in6a;
755 } else
756 laddr = &inp->in6p_laddr; /* XXX */
757 if (laddr == NULL) {
758 if (error == 0)
759 error = EADDRNOTAVAIL;
760 goto release;
761 }
762 if (inp->inp_lport == 0 &&
763 (error = in6_pcbsetport(laddr, inp, td->td_ucred)) != 0) {
764 /* Undo an address bind that may have occurred. */
765 inp->in6p_laddr = in6addr_any;
766 goto release;
767 }
768 } else {
769 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
770 error = ENOTCONN;
771 goto release;
772 }
773 if (IN6_IS_ADDR_V4MAPPED(&inp->in6p_faddr)) {
774 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
775 /*
776 * XXX: this case would happen when the
777 * application sets the V6ONLY flag after
778 * connecting the foreign address.
779 * Such applications should be fixed,
780 * so we bark here.
781 */
782 log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
783 "option was set for a connected socket\n");
784 error = EINVAL;
785 goto release;
786 } else
787 af = AF_INET;
788 }
789 laddr = &inp->in6p_laddr;
790 faddr = &inp->in6p_faddr;
791 fport = inp->inp_fport;
792 }
793
794 if (af == AF_INET)
795 hlen = sizeof(struct ip);
796
797 /*
798 * Calculate data length and get a mbuf
799 * for UDP and IP6 headers.
800 */
801 M_PREPEND(m, hlen + sizeof(struct udphdr), M_NOWAIT);
802 if (m == NULL) {
803 error = ENOBUFS;
804 goto release;
805 }
806
807 /*
808 * Stuff checksum and output datagram.
809 */
810 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
811 udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */
812 udp6->uh_dport = fport;
813 if (nxt == IPPROTO_UDPLITE) {
814 struct udpcb *up;
815
816 up = intoudpcb(inp);
817 cscov = up->u_txcslen;
818 if (cscov >= plen)
819 cscov = 0;
820 udp6->uh_ulen = htons(cscov);
821 /*
822 * For UDP-Lite, checksum coverage length of zero means
823 * the entire UDPLite packet is covered by the checksum.
824 */
825 cscov_partial = (cscov == 0) ? 0 : 1;
826 } else if (plen <= 0xffff)
827 udp6->uh_ulen = htons((u_short)plen);
828 else
829 udp6->uh_ulen = 0;
830 udp6->uh_sum = 0;
831
832 switch (af) {
833 case AF_INET6:
834 ip6 = mtod(m, struct ip6_hdr *);
835 ip6->ip6_flow = inp->inp_flow & IPV6_FLOWINFO_MASK;
836 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
837 ip6->ip6_vfc |= IPV6_VERSION;
838 ip6->ip6_plen = htons((u_short)plen);
839 ip6->ip6_nxt = nxt;
840 ip6->ip6_hlim = in6_selecthlim(inp, NULL);
841 ip6->ip6_src = *laddr;
842 ip6->ip6_dst = *faddr;
843
844 if (cscov_partial) {
845 if ((udp6->uh_sum = in6_cksum_partial(m, nxt,
846 sizeof(struct ip6_hdr), plen, cscov)) == 0)
847 udp6->uh_sum = 0xffff;
848 } else {
849 udp6->uh_sum = in6_cksum_pseudo(ip6, plen, nxt, 0);
850 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6;
851 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
852 }
853
854 #ifdef RSS
855 {
856 uint32_t hash_val, hash_type;
857 uint8_t pr;
858
859 pr = inp->inp_socket->so_proto->pr_protocol;
860 /*
861 * Calculate an appropriate RSS hash for UDP and
862 * UDP Lite.
863 *
864 * The called function will take care of figuring out
865 * whether a 2-tuple or 4-tuple hash is required based
866 * on the currently configured scheme.
867 *
868 * Later later on connected socket values should be
869 * cached in the inpcb and reused, rather than constantly
870 * re-calculating it.
871 *
872 * UDP Lite is a different protocol number and will
873 * likely end up being hashed as a 2-tuple until
874 * RSS / NICs grow UDP Lite protocol awareness.
875 */
876 if (rss_proto_software_hash_v6(faddr, laddr, fport,
877 inp->inp_lport, pr, &hash_val, &hash_type) == 0) {
878 m->m_pkthdr.flowid = hash_val;
879 M_HASHTYPE_SET(m, hash_type);
880 }
881 }
882 #endif
883 flags = 0;
884 #ifdef RSS
885 /*
886 * Don't override with the inp cached flowid.
887 *
888 * Until the whole UDP path is vetted, it may actually
889 * be incorrect.
890 */
891 flags |= IP_NODEFAULTFLOWID;
892 #endif
893
894 UDP_PROBE(send, NULL, inp, ip6, inp, udp6);
895 UDPSTAT_INC(udps_opackets);
896 error = ip6_output(m, optp, &inp->inp_route6, flags,
897 inp->in6p_moptions, NULL, inp);
898 break;
899 case AF_INET:
900 error = EAFNOSUPPORT;
901 goto release;
902 }
903 goto releaseopt;
904
905 release:
906 m_freem(m);
907
908 releaseopt:
909 if (control) {
910 ip6_clearpktopts(&opt, -1);
911 m_freem(control);
912 }
913 return (error);
914 }
915
916 static void
917 udp6_abort(struct socket *so)
918 {
919 struct inpcb *inp;
920 struct inpcbinfo *pcbinfo;
921
922 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
923 inp = sotoinpcb(so);
924 KASSERT(inp != NULL, ("udp6_abort: inp == NULL"));
925
926 INP_WLOCK(inp);
927 #ifdef INET
928 if (inp->inp_vflag & INP_IPV4) {
929 struct pr_usrreqs *pru;
930 uint8_t nxt;
931
932 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
933 IPPROTO_UDP : IPPROTO_UDPLITE;
934 INP_WUNLOCK(inp);
935 pru = inetsw[ip_protox[nxt]].pr_usrreqs;
936 (*pru->pru_abort)(so);
937 return;
938 }
939 #endif
940
941 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
942 INP_HASH_WLOCK(pcbinfo);
943 in6_pcbdisconnect(inp);
944 inp->in6p_laddr = in6addr_any;
945 INP_HASH_WUNLOCK(pcbinfo);
946 soisdisconnected(so);
947 }
948 INP_WUNLOCK(inp);
949 }
950
951 static int
952 udp6_attach(struct socket *so, int proto, struct thread *td)
953 {
954 struct inpcb *inp;
955 struct inpcbinfo *pcbinfo;
956 int error;
957
958 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
959 inp = sotoinpcb(so);
960 KASSERT(inp == NULL, ("udp6_attach: inp != NULL"));
961
962 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
963 error = soreserve(so, udp_sendspace, udp_recvspace);
964 if (error)
965 return (error);
966 }
967 INP_INFO_WLOCK(pcbinfo);
968 error = in_pcballoc(so, pcbinfo);
969 if (error) {
970 INP_INFO_WUNLOCK(pcbinfo);
971 return (error);
972 }
973 inp = (struct inpcb *)so->so_pcb;
974 inp->inp_vflag |= INP_IPV6;
975 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
976 inp->inp_vflag |= INP_IPV4;
977 inp->in6p_hops = -1; /* use kernel default */
978 inp->in6p_cksum = -1; /* just to be sure */
979 /*
980 * XXX: ugly!!
981 * IPv4 TTL initialization is necessary for an IPv6 socket as well,
982 * because the socket may be bound to an IPv6 wildcard address,
983 * which may match an IPv4-mapped IPv6 address.
984 */
985 inp->inp_ip_ttl = V_ip_defttl;
986
987 error = udp_newudpcb(inp);
988 if (error) {
989 in_pcbdetach(inp);
990 in_pcbfree(inp);
991 INP_INFO_WUNLOCK(pcbinfo);
992 return (error);
993 }
994 INP_WUNLOCK(inp);
995 INP_INFO_WUNLOCK(pcbinfo);
996 return (0);
997 }
998
999 static int
1000 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
1001 {
1002 struct inpcb *inp;
1003 struct inpcbinfo *pcbinfo;
1004 int error;
1005 u_char vflagsav;
1006
1007 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1008 inp = sotoinpcb(so);
1009 KASSERT(inp != NULL, ("udp6_bind: inp == NULL"));
1010
1011 INP_WLOCK(inp);
1012 INP_HASH_WLOCK(pcbinfo);
1013 vflagsav = inp->inp_vflag;
1014 inp->inp_vflag &= ~INP_IPV4;
1015 inp->inp_vflag |= INP_IPV6;
1016 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
1017 struct sockaddr_in6 *sin6_p;
1018
1019 sin6_p = (struct sockaddr_in6 *)nam;
1020
1021 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
1022 inp->inp_vflag |= INP_IPV4;
1023 #ifdef INET
1024 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
1025 struct sockaddr_in sin;
1026
1027 in6_sin6_2_sin(&sin, sin6_p);
1028 inp->inp_vflag |= INP_IPV4;
1029 inp->inp_vflag &= ~INP_IPV6;
1030 error = in_pcbbind(inp, (struct sockaddr *)&sin,
1031 td->td_ucred);
1032 goto out;
1033 }
1034 #endif
1035 }
1036
1037 error = in6_pcbbind(inp, nam, td->td_ucred);
1038 #ifdef INET
1039 out:
1040 #endif
1041 if (error != 0)
1042 inp->inp_vflag = vflagsav;
1043 INP_HASH_WUNLOCK(pcbinfo);
1044 INP_WUNLOCK(inp);
1045 return (error);
1046 }
1047
1048 static void
1049 udp6_close(struct socket *so)
1050 {
1051 struct inpcb *inp;
1052 struct inpcbinfo *pcbinfo;
1053
1054 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1055 inp = sotoinpcb(so);
1056 KASSERT(inp != NULL, ("udp6_close: inp == NULL"));
1057
1058 INP_WLOCK(inp);
1059 #ifdef INET
1060 if (inp->inp_vflag & INP_IPV4) {
1061 struct pr_usrreqs *pru;
1062 uint8_t nxt;
1063
1064 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
1065 IPPROTO_UDP : IPPROTO_UDPLITE;
1066 INP_WUNLOCK(inp);
1067 pru = inetsw[ip_protox[nxt]].pr_usrreqs;
1068 (*pru->pru_disconnect)(so);
1069 return;
1070 }
1071 #endif
1072 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1073 INP_HASH_WLOCK(pcbinfo);
1074 in6_pcbdisconnect(inp);
1075 inp->in6p_laddr = in6addr_any;
1076 INP_HASH_WUNLOCK(pcbinfo);
1077 soisdisconnected(so);
1078 }
1079 INP_WUNLOCK(inp);
1080 }
1081
1082 static int
1083 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1084 {
1085 struct inpcb *inp;
1086 struct inpcbinfo *pcbinfo;
1087 struct sockaddr_in6 *sin6;
1088 int error;
1089 u_char vflagsav;
1090
1091 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1092 inp = sotoinpcb(so);
1093 sin6 = (struct sockaddr_in6 *)nam;
1094 KASSERT(inp != NULL, ("udp6_connect: inp == NULL"));
1095
1096 /*
1097 * XXXRW: Need to clarify locking of v4/v6 flags.
1098 */
1099 INP_WLOCK(inp);
1100 #ifdef INET
1101 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
1102 struct sockaddr_in sin;
1103
1104 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
1105 error = EINVAL;
1106 goto out;
1107 }
1108 if ((inp->inp_vflag & INP_IPV4) == 0) {
1109 error = EAFNOSUPPORT;
1110 goto out;
1111 }
1112 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1113 error = EISCONN;
1114 goto out;
1115 }
1116 in6_sin6_2_sin(&sin, sin6);
1117 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr);
1118 if (error != 0)
1119 goto out;
1120 vflagsav = inp->inp_vflag;
1121 inp->inp_vflag |= INP_IPV4;
1122 inp->inp_vflag &= ~INP_IPV6;
1123 INP_HASH_WLOCK(pcbinfo);
1124 error = in_pcbconnect(inp, (struct sockaddr *)&sin,
1125 td->td_ucred);
1126 INP_HASH_WUNLOCK(pcbinfo);
1127 /*
1128 * If connect succeeds, mark socket as connected. If
1129 * connect fails and socket is unbound, reset inp_vflag
1130 * field.
1131 */
1132 if (error == 0)
1133 soisconnected(so);
1134 else if (inp->inp_laddr.s_addr == INADDR_ANY &&
1135 inp->inp_lport == 0)
1136 inp->inp_vflag = vflagsav;
1137 goto out;
1138 } else {
1139 if ((inp->inp_vflag & INP_IPV6) == 0) {
1140 error = EAFNOSUPPORT;
1141 goto out;
1142 }
1143 }
1144 #endif
1145 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1146 error = EISCONN;
1147 goto out;
1148 }
1149 error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr);
1150 if (error != 0)
1151 goto out;
1152 vflagsav = inp->inp_vflag;
1153 inp->inp_vflag &= ~INP_IPV4;
1154 inp->inp_vflag |= INP_IPV6;
1155 INP_HASH_WLOCK(pcbinfo);
1156 error = in6_pcbconnect(inp, nam, td->td_ucred);
1157 INP_HASH_WUNLOCK(pcbinfo);
1158 /*
1159 * If connect succeeds, mark socket as connected. If
1160 * connect fails and socket is unbound, reset inp_vflag
1161 * field.
1162 */
1163 if (error == 0)
1164 soisconnected(so);
1165 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
1166 inp->inp_lport == 0)
1167 inp->inp_vflag = vflagsav;
1168 out:
1169 INP_WUNLOCK(inp);
1170 return (error);
1171 }
1172
1173 static void
1174 udp6_detach(struct socket *so)
1175 {
1176 struct inpcb *inp;
1177 struct inpcbinfo *pcbinfo;
1178 struct udpcb *up;
1179
1180 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1181 inp = sotoinpcb(so);
1182 KASSERT(inp != NULL, ("udp6_detach: inp == NULL"));
1183
1184 INP_INFO_WLOCK(pcbinfo);
1185 INP_WLOCK(inp);
1186 up = intoudpcb(inp);
1187 KASSERT(up != NULL, ("%s: up == NULL", __func__));
1188 in_pcbdetach(inp);
1189 in_pcbfree(inp);
1190 INP_INFO_WUNLOCK(pcbinfo);
1191 udp_discardcb(up);
1192 }
1193
1194 static int
1195 udp6_disconnect(struct socket *so)
1196 {
1197 struct inpcb *inp;
1198 struct inpcbinfo *pcbinfo;
1199 int error;
1200
1201 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1202 inp = sotoinpcb(so);
1203 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL"));
1204
1205 INP_WLOCK(inp);
1206 #ifdef INET
1207 if (inp->inp_vflag & INP_IPV4) {
1208 struct pr_usrreqs *pru;
1209 uint8_t nxt;
1210
1211 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
1212 IPPROTO_UDP : IPPROTO_UDPLITE;
1213 INP_WUNLOCK(inp);
1214 pru = inetsw[ip_protox[nxt]].pr_usrreqs;
1215 (void)(*pru->pru_disconnect)(so);
1216 return (0);
1217 }
1218 #endif
1219
1220 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1221 error = ENOTCONN;
1222 goto out;
1223 }
1224
1225 INP_HASH_WLOCK(pcbinfo);
1226 in6_pcbdisconnect(inp);
1227 inp->in6p_laddr = in6addr_any;
1228 INP_HASH_WUNLOCK(pcbinfo);
1229 SOCK_LOCK(so);
1230 so->so_state &= ~SS_ISCONNECTED; /* XXX */
1231 SOCK_UNLOCK(so);
1232 out:
1233 INP_WUNLOCK(inp);
1234 return (0);
1235 }
1236
1237 static int
1238 udp6_send(struct socket *so, int flags, struct mbuf *m,
1239 struct sockaddr *addr, struct mbuf *control, struct thread *td)
1240 {
1241 struct inpcb *inp;
1242 struct inpcbinfo *pcbinfo;
1243 int error = 0;
1244
1245 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1246 inp = sotoinpcb(so);
1247 KASSERT(inp != NULL, ("udp6_send: inp == NULL"));
1248
1249 INP_WLOCK(inp);
1250 if (addr) {
1251 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
1252 error = EINVAL;
1253 goto bad;
1254 }
1255 if (addr->sa_family != AF_INET6) {
1256 error = EAFNOSUPPORT;
1257 goto bad;
1258 }
1259 }
1260
1261 #ifdef INET
1262 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
1263 int hasv4addr;
1264 struct sockaddr_in6 *sin6 = NULL;
1265
1266 if (addr == NULL)
1267 hasv4addr = (inp->inp_vflag & INP_IPV4);
1268 else {
1269 sin6 = (struct sockaddr_in6 *)addr;
1270 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
1271 ? 1 : 0;
1272 }
1273 if (hasv4addr) {
1274 struct pr_usrreqs *pru;
1275 uint8_t nxt;
1276
1277 nxt = (inp->inp_socket->so_proto->pr_protocol ==
1278 IPPROTO_UDP) ? IPPROTO_UDP : IPPROTO_UDPLITE;
1279 /*
1280 * XXXRW: We release UDP-layer locks before calling
1281 * udp_send() in order to avoid recursion. However,
1282 * this does mean there is a short window where inp's
1283 * fields are unstable. Could this lead to a
1284 * potential race in which the factors causing us to
1285 * select the UDPv4 output routine are invalidated?
1286 */
1287 INP_WUNLOCK(inp);
1288 if (sin6)
1289 in6_sin6_2_sin_in_sock(addr);
1290 pru = inetsw[ip_protox[nxt]].pr_usrreqs;
1291 /* addr will just be freed in sendit(). */
1292 return ((*pru->pru_send)(so, flags, m, addr, control,
1293 td));
1294 }
1295 }
1296 #endif
1297 #ifdef MAC
1298 mac_inpcb_create_mbuf(inp, m);
1299 #endif
1300 INP_HASH_WLOCK(pcbinfo);
1301 error = udp6_output(inp, m, addr, control, td);
1302 INP_HASH_WUNLOCK(pcbinfo);
1303 INP_WUNLOCK(inp);
1304 return (error);
1305
1306 bad:
1307 INP_WUNLOCK(inp);
1308 m_freem(m);
1309 return (error);
1310 }
1311
1312 struct pr_usrreqs udp6_usrreqs = {
1313 .pru_abort = udp6_abort,
1314 .pru_attach = udp6_attach,
1315 .pru_bind = udp6_bind,
1316 .pru_connect = udp6_connect,
1317 .pru_control = in6_control,
1318 .pru_detach = udp6_detach,
1319 .pru_disconnect = udp6_disconnect,
1320 .pru_peeraddr = in6_mapped_peeraddr,
1321 .pru_send = udp6_send,
1322 .pru_shutdown = udp_shutdown,
1323 .pru_sockaddr = in6_mapped_sockaddr,
1324 .pru_soreceive = soreceive_dgram,
1325 .pru_sosend = sosend_dgram,
1326 .pru_sosetlabel = in_pcbsosetlabel,
1327 .pru_close = udp6_close
1328 };
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