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/11.0/sys/netinet6/udp6_usrreq.c 304642 2016-08-22 22:29:57Z karels $");
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/ip_icmp.h>
108 #include <netinet/ip6.h>
109 #include <netinet/icmp_var.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 #ifdef IPSEC
124 #include <netipsec/ipsec.h>
125 #include <netipsec/ipsec6.h>
126 #endif /* IPSEC */
127
128 #include <security/mac/mac_framework.h>
129
130 /*
131 * UDP protocol implementation.
132 * Per RFC 768, August, 1980.
133 */
134
135 extern struct protosw inetsw[];
136 static void udp6_detach(struct socket *so);
137
138 static int
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;
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 in_pcbref(inp);
154 INP_RUNLOCK(inp);
155 (*up->u_tun_func)(n, off, inp, (struct sockaddr *)fromsa,
156 up->u_tun_ctx);
157 INP_RLOCK(inp);
158 return (in_pcbrele_rlocked(inp));
159 }
160 #ifdef IPSEC
161 /* Check AH/ESP integrity. */
162 if (ipsec6_in_reject(n, inp)) {
163 m_freem(n);
164 return (0);
165 }
166 #endif /* IPSEC */
167 #ifdef MAC
168 if (mac_inpcb_check_deliver(inp, n) != 0) {
169 m_freem(n);
170 return (0);
171 }
172 #endif
173 opts = NULL;
174 if (inp->inp_flags & INP_CONTROLOPTS ||
175 inp->inp_socket->so_options & SO_TIMESTAMP)
176 ip6_savecontrol(inp, n, &opts);
177 m_adj(n, off + sizeof(struct udphdr));
178
179 so = inp->inp_socket;
180 SOCKBUF_LOCK(&so->so_rcv);
181 if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)fromsa, n,
182 opts) == 0) {
183 SOCKBUF_UNLOCK(&so->so_rcv);
184 m_freem(n);
185 if (opts)
186 m_freem(opts);
187 UDPSTAT_INC(udps_fullsock);
188 } else
189 sorwakeup_locked(so);
190 return (0);
191 }
192
193 int
194 udp6_input(struct mbuf **mp, int *offp, int proto)
195 {
196 struct mbuf *m = *mp;
197 struct ifnet *ifp;
198 struct ip6_hdr *ip6;
199 struct udphdr *uh;
200 struct inpcb *inp;
201 struct inpcbinfo *pcbinfo;
202 struct udpcb *up;
203 int off = *offp;
204 int cscov_partial;
205 int plen, ulen;
206 struct sockaddr_in6 fromsa;
207 struct m_tag *fwd_tag;
208 uint16_t uh_sum;
209 uint8_t nxt;
210
211 ifp = m->m_pkthdr.rcvif;
212 ip6 = mtod(m, struct ip6_hdr *);
213
214 #ifndef PULLDOWN_TEST
215 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
216 ip6 = mtod(m, struct ip6_hdr *);
217 uh = (struct udphdr *)((caddr_t)ip6 + off);
218 #else
219 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh));
220 if (!uh)
221 return (IPPROTO_DONE);
222 #endif
223
224 UDPSTAT_INC(udps_ipackets);
225
226 /*
227 * Destination port of 0 is illegal, based on RFC768.
228 */
229 if (uh->uh_dport == 0)
230 goto badunlocked;
231
232 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
233 ulen = ntohs((u_short)uh->uh_ulen);
234
235 nxt = proto;
236 cscov_partial = (nxt == IPPROTO_UDPLITE) ? 1 : 0;
237 if (nxt == IPPROTO_UDPLITE) {
238 /* Zero means checksum over the complete packet. */
239 if (ulen == 0)
240 ulen = plen;
241 if (ulen == plen)
242 cscov_partial = 0;
243 if ((ulen < sizeof(struct udphdr)) || (ulen > plen)) {
244 /* XXX: What is the right UDPLite MIB counter? */
245 goto badunlocked;
246 }
247 if (uh->uh_sum == 0) {
248 /* XXX: What is the right UDPLite MIB counter? */
249 goto badunlocked;
250 }
251 } else {
252 if ((ulen < sizeof(struct udphdr)) || (plen != ulen)) {
253 UDPSTAT_INC(udps_badlen);
254 goto badunlocked;
255 }
256 if (uh->uh_sum == 0) {
257 UDPSTAT_INC(udps_nosum);
258 goto badunlocked;
259 }
260 }
261
262 if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID_IPV6) &&
263 !cscov_partial) {
264 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
265 uh_sum = m->m_pkthdr.csum_data;
266 else
267 uh_sum = in6_cksum_pseudo(ip6, ulen, nxt,
268 m->m_pkthdr.csum_data);
269 uh_sum ^= 0xffff;
270 } else
271 uh_sum = in6_cksum_partial(m, nxt, off, plen, ulen);
272
273 if (uh_sum != 0) {
274 UDPSTAT_INC(udps_badsum);
275 goto badunlocked;
276 }
277
278 /*
279 * Construct sockaddr format source address.
280 */
281 init_sin6(&fromsa, m);
282 fromsa.sin6_port = uh->uh_sport;
283
284 pcbinfo = udp_get_inpcbinfo(nxt);
285 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
286 struct inpcb *last;
287 struct inpcbhead *pcblist;
288 struct ip6_moptions *imo;
289
290 INP_INFO_RLOCK(pcbinfo);
291 /*
292 * In the event that laddr should be set to the link-local
293 * address (this happens in RIPng), the multicast address
294 * specified in the received packet will not match laddr. To
295 * handle this situation, matching is relaxed if the
296 * receiving interface is the same as one specified in the
297 * socket and if the destination multicast address matches
298 * one of the multicast groups specified in the socket.
299 */
300
301 /*
302 * KAME note: traditionally we dropped udpiphdr from mbuf
303 * here. We need udphdr for IPsec processing so we do that
304 * later.
305 */
306 pcblist = udp_get_pcblist(nxt);
307 last = NULL;
308 LIST_FOREACH(inp, pcblist, inp_list) {
309 if ((inp->inp_vflag & INP_IPV6) == 0)
310 continue;
311 if (inp->inp_lport != uh->uh_dport)
312 continue;
313 if (inp->inp_fport != 0 &&
314 inp->inp_fport != uh->uh_sport)
315 continue;
316 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
317 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
318 &ip6->ip6_dst))
319 continue;
320 }
321 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
322 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
323 &ip6->ip6_src) ||
324 inp->inp_fport != uh->uh_sport)
325 continue;
326 }
327
328 /*
329 * XXXRW: Because we weren't holding either the inpcb
330 * or the hash lock when we checked for a match
331 * before, we should probably recheck now that the
332 * inpcb lock is (supposed to be) held.
333 */
334
335 /*
336 * Handle socket delivery policy for any-source
337 * and source-specific multicast. [RFC3678]
338 */
339 imo = inp->in6p_moptions;
340 if (imo && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
341 struct sockaddr_in6 mcaddr;
342 int blocked;
343
344 INP_RLOCK(inp);
345
346 bzero(&mcaddr, sizeof(struct sockaddr_in6));
347 mcaddr.sin6_len = sizeof(struct sockaddr_in6);
348 mcaddr.sin6_family = AF_INET6;
349 mcaddr.sin6_addr = ip6->ip6_dst;
350
351 blocked = im6o_mc_filter(imo, ifp,
352 (struct sockaddr *)&mcaddr,
353 (struct sockaddr *)&fromsa);
354 if (blocked != MCAST_PASS) {
355 if (blocked == MCAST_NOTGMEMBER)
356 IP6STAT_INC(ip6s_notmember);
357 if (blocked == MCAST_NOTSMEMBER ||
358 blocked == MCAST_MUTED)
359 UDPSTAT_INC(udps_filtermcast);
360 INP_RUNLOCK(inp); /* XXX */
361 continue;
362 }
363
364 INP_RUNLOCK(inp);
365 }
366 if (last != NULL) {
367 struct mbuf *n;
368
369 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
370 INP_RLOCK(last);
371 UDP_PROBE(receive, NULL, last, ip6,
372 last, uh);
373 if (udp6_append(last, n, off, &fromsa))
374 goto inp_lost;
375 INP_RUNLOCK(last);
376 }
377 }
378 last = inp;
379 /*
380 * Don't look for additional matches if this one does
381 * not have either the SO_REUSEPORT or SO_REUSEADDR
382 * socket options set. This heuristic avoids
383 * searching through all pcbs in the common case of a
384 * non-shared port. It assumes that an application
385 * will never clear these options after setting them.
386 */
387 if ((last->inp_socket->so_options &
388 (SO_REUSEPORT|SO_REUSEADDR)) == 0)
389 break;
390 }
391
392 if (last == NULL) {
393 /*
394 * No matching pcb found; discard datagram. (No need
395 * to send an ICMP Port Unreachable for a broadcast
396 * or multicast datgram.)
397 */
398 UDPSTAT_INC(udps_noport);
399 UDPSTAT_INC(udps_noportmcast);
400 goto badheadlocked;
401 }
402 INP_RLOCK(last);
403 INP_INFO_RUNLOCK(pcbinfo);
404 UDP_PROBE(receive, NULL, last, ip6, last, uh);
405 if (udp6_append(last, m, off, &fromsa) == 0)
406 INP_RUNLOCK(last);
407 inp_lost:
408 return (IPPROTO_DONE);
409 }
410 /*
411 * Locate pcb for datagram.
412 */
413
414 /*
415 * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
416 */
417 if ((m->m_flags & M_IP6_NEXTHOP) &&
418 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
419 struct sockaddr_in6 *next_hop6;
420
421 next_hop6 = (struct sockaddr_in6 *)(fwd_tag + 1);
422
423 /*
424 * Transparently forwarded. Pretend to be the destination.
425 * Already got one like this?
426 */
427 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src,
428 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
429 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif, m);
430 if (!inp) {
431 /*
432 * It's new. Try to find the ambushing socket.
433 * Because we've rewritten the destination address,
434 * any hardware-generated hash is ignored.
435 */
436 inp = in6_pcblookup(pcbinfo, &ip6->ip6_src,
437 uh->uh_sport, &next_hop6->sin6_addr,
438 next_hop6->sin6_port ? htons(next_hop6->sin6_port) :
439 uh->uh_dport, INPLOOKUP_WILDCARD |
440 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif);
441 }
442 /* Remove the tag from the packet. We don't need it anymore. */
443 m_tag_delete(m, fwd_tag);
444 m->m_flags &= ~M_IP6_NEXTHOP;
445 } else
446 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src,
447 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
448 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB,
449 m->m_pkthdr.rcvif, m);
450 if (inp == NULL) {
451 if (udp_log_in_vain) {
452 char ip6bufs[INET6_ADDRSTRLEN];
453 char ip6bufd[INET6_ADDRSTRLEN];
454
455 log(LOG_INFO,
456 "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
457 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
458 ntohs(uh->uh_dport),
459 ip6_sprintf(ip6bufs, &ip6->ip6_src),
460 ntohs(uh->uh_sport));
461 }
462 UDPSTAT_INC(udps_noport);
463 if (m->m_flags & M_MCAST) {
464 printf("UDP6: M_MCAST is set in a unicast packet.\n");
465 UDPSTAT_INC(udps_noportmcast);
466 goto badunlocked;
467 }
468 if (V_udp_blackhole)
469 goto badunlocked;
470 if (badport_bandlim(BANDLIM_ICMP6_UNREACH) < 0)
471 goto badunlocked;
472 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
473 return (IPPROTO_DONE);
474 }
475 INP_RLOCK_ASSERT(inp);
476 up = intoudpcb(inp);
477 if (cscov_partial) {
478 if (up->u_rxcslen == 0 || up->u_rxcslen > ulen) {
479 INP_RUNLOCK(inp);
480 m_freem(m);
481 return (IPPROTO_DONE);
482 }
483 }
484 UDP_PROBE(receive, NULL, inp, ip6, inp, uh);
485 if (udp6_append(inp, m, off, &fromsa) == 0)
486 INP_RUNLOCK(inp);
487 return (IPPROTO_DONE);
488
489 badheadlocked:
490 INP_INFO_RUNLOCK(pcbinfo);
491 badunlocked:
492 if (m)
493 m_freem(m);
494 return (IPPROTO_DONE);
495 }
496
497 static void
498 udp6_common_ctlinput(int cmd, struct sockaddr *sa, void *d,
499 struct inpcbinfo *pcbinfo)
500 {
501 struct udphdr uh;
502 struct ip6_hdr *ip6;
503 struct mbuf *m;
504 int off = 0;
505 struct ip6ctlparam *ip6cp = NULL;
506 const struct sockaddr_in6 *sa6_src = NULL;
507 void *cmdarg;
508 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify;
509 struct udp_portonly {
510 u_int16_t uh_sport;
511 u_int16_t uh_dport;
512 } *uhp;
513
514 if (sa->sa_family != AF_INET6 ||
515 sa->sa_len != sizeof(struct sockaddr_in6))
516 return;
517
518 if ((unsigned)cmd >= PRC_NCMDS)
519 return;
520 if (PRC_IS_REDIRECT(cmd))
521 notify = in6_rtchange, d = NULL;
522 else if (cmd == PRC_HOSTDEAD)
523 d = NULL;
524 else if (inet6ctlerrmap[cmd] == 0)
525 return;
526
527 /* if the parameter is from icmp6, decode it. */
528 if (d != NULL) {
529 ip6cp = (struct ip6ctlparam *)d;
530 m = ip6cp->ip6c_m;
531 ip6 = ip6cp->ip6c_ip6;
532 off = ip6cp->ip6c_off;
533 cmdarg = ip6cp->ip6c_cmdarg;
534 sa6_src = ip6cp->ip6c_src;
535 } else {
536 m = NULL;
537 ip6 = NULL;
538 cmdarg = NULL;
539 sa6_src = &sa6_any;
540 }
541
542 if (ip6) {
543 /*
544 * XXX: We assume that when IPV6 is non NULL,
545 * M and OFF are valid.
546 */
547
548 /* Check if we can safely examine src and dst ports. */
549 if (m->m_pkthdr.len < off + sizeof(*uhp))
550 return;
551
552 bzero(&uh, sizeof(uh));
553 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
554
555 if (!PRC_IS_REDIRECT(cmd)) {
556 /* Check to see if its tunneled */
557 struct inpcb *inp;
558 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_dst,
559 uh.uh_dport, &ip6->ip6_src, uh.uh_sport,
560 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB,
561 m->m_pkthdr.rcvif, m);
562 if (inp != NULL) {
563 struct udpcb *up;
564
565 up = intoudpcb(inp);
566 if (up->u_icmp_func) {
567 /* Yes it is. */
568 INP_RUNLOCK(inp);
569 (*up->u_icmp_func)(cmd, (struct sockaddr *)ip6cp->ip6c_src,
570 d, up->u_tun_ctx);
571 return;
572 } else {
573 /* Can't find it. */
574 INP_RUNLOCK(inp);
575 }
576 }
577 }
578 (void)in6_pcbnotify(pcbinfo, sa, uh.uh_dport,
579 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd,
580 cmdarg, notify);
581 } else
582 (void)in6_pcbnotify(pcbinfo, sa, 0,
583 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
584 }
585
586 void
587 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
588 {
589
590 return (udp6_common_ctlinput(cmd, sa, d, &V_udbinfo));
591 }
592
593 void
594 udplite6_ctlinput(int cmd, struct sockaddr *sa, void *d)
595 {
596
597 return (udp6_common_ctlinput(cmd, sa, d, &V_ulitecbinfo));
598 }
599
600 static int
601 udp6_getcred(SYSCTL_HANDLER_ARGS)
602 {
603 struct xucred xuc;
604 struct sockaddr_in6 addrs[2];
605 struct inpcb *inp;
606 int error;
607
608 error = priv_check(req->td, PRIV_NETINET_GETCRED);
609 if (error)
610 return (error);
611
612 if (req->newlen != sizeof(addrs))
613 return (EINVAL);
614 if (req->oldlen != sizeof(struct xucred))
615 return (EINVAL);
616 error = SYSCTL_IN(req, addrs, sizeof(addrs));
617 if (error)
618 return (error);
619 if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 ||
620 (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) {
621 return (error);
622 }
623 inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr,
624 addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port,
625 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
626 if (inp != NULL) {
627 INP_RLOCK_ASSERT(inp);
628 if (inp->inp_socket == NULL)
629 error = ENOENT;
630 if (error == 0)
631 error = cr_canseesocket(req->td->td_ucred,
632 inp->inp_socket);
633 if (error == 0)
634 cru2x(inp->inp_cred, &xuc);
635 INP_RUNLOCK(inp);
636 } else
637 error = ENOENT;
638 if (error == 0)
639 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
640 return (error);
641 }
642
643 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0,
644 0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection");
645
646 static int
647 udp6_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr6,
648 struct mbuf *control, struct thread *td)
649 {
650 u_int32_t ulen = m->m_pkthdr.len;
651 u_int32_t plen = sizeof(struct udphdr) + ulen;
652 struct ip6_hdr *ip6;
653 struct udphdr *udp6;
654 struct in6_addr *laddr, *faddr, in6a;
655 struct sockaddr_in6 *sin6 = NULL;
656 int cscov_partial = 0;
657 int scope_ambiguous = 0;
658 u_short fport;
659 int error = 0;
660 uint8_t nxt;
661 uint16_t cscov = 0;
662 struct ip6_pktopts *optp, opt;
663 int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
664 int flags;
665 struct sockaddr_in6 tmp;
666
667 INP_WLOCK_ASSERT(inp);
668 INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
669
670 if (addr6) {
671 /* addr6 has been validated in udp6_send(). */
672 sin6 = (struct sockaddr_in6 *)addr6;
673
674 /* protect *sin6 from overwrites */
675 tmp = *sin6;
676 sin6 = &tmp;
677
678 /*
679 * Application should provide a proper zone ID or the use of
680 * default zone IDs should be enabled. Unfortunately, some
681 * applications do not behave as it should, so we need a
682 * workaround. Even if an appropriate ID is not determined,
683 * we'll see if we can determine the outgoing interface. If we
684 * can, determine the zone ID based on the interface below.
685 */
686 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone)
687 scope_ambiguous = 1;
688 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
689 return (error);
690 }
691
692 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
693 IPPROTO_UDP : IPPROTO_UDPLITE;
694 if (control) {
695 if ((error = ip6_setpktopts(control, &opt,
696 inp->in6p_outputopts, td->td_ucred, nxt)) != 0)
697 goto release;
698 optp = &opt;
699 } else
700 optp = inp->in6p_outputopts;
701
702 if (sin6) {
703 faddr = &sin6->sin6_addr;
704
705 /*
706 * Since we saw no essential reason for calling in_pcbconnect,
707 * we get rid of such kind of logic, and call in6_selectsrc
708 * and in6_pcbsetport in order to fill in the local address
709 * and the local port.
710 */
711 if (sin6->sin6_port == 0) {
712 error = EADDRNOTAVAIL;
713 goto release;
714 }
715
716 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
717 /* how about ::ffff:0.0.0.0 case? */
718 error = EISCONN;
719 goto release;
720 }
721
722 fport = sin6->sin6_port; /* allow 0 port */
723
724 if (IN6_IS_ADDR_V4MAPPED(faddr)) {
725 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
726 /*
727 * I believe we should explicitly discard the
728 * packet when mapped addresses are disabled,
729 * rather than send the packet as an IPv6 one.
730 * If we chose the latter approach, the packet
731 * might be sent out on the wire based on the
732 * default route, the situation which we'd
733 * probably want to avoid.
734 * (20010421 jinmei@kame.net)
735 */
736 error = EINVAL;
737 goto release;
738 }
739 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
740 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) {
741 /*
742 * when remote addr is an IPv4-mapped address,
743 * local addr should not be an IPv6 address,
744 * since you cannot determine how to map IPv6
745 * source address to IPv4.
746 */
747 error = EINVAL;
748 goto release;
749 }
750
751 af = AF_INET;
752 }
753
754 if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
755 error = in6_selectsrc_socket(sin6, optp, inp,
756 td->td_ucred, scope_ambiguous, &in6a, NULL);
757 if (error)
758 goto release;
759 laddr = &in6a;
760 } else
761 laddr = &inp->in6p_laddr; /* XXX */
762 if (laddr == NULL) {
763 if (error == 0)
764 error = EADDRNOTAVAIL;
765 goto release;
766 }
767 if (inp->inp_lport == 0 &&
768 (error = in6_pcbsetport(laddr, inp, td->td_ucred)) != 0) {
769 /* Undo an address bind that may have occurred. */
770 inp->in6p_laddr = in6addr_any;
771 goto release;
772 }
773 } else {
774 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
775 error = ENOTCONN;
776 goto release;
777 }
778 if (IN6_IS_ADDR_V4MAPPED(&inp->in6p_faddr)) {
779 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
780 /*
781 * XXX: this case would happen when the
782 * application sets the V6ONLY flag after
783 * connecting the foreign address.
784 * Such applications should be fixed,
785 * so we bark here.
786 */
787 log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
788 "option was set for a connected socket\n");
789 error = EINVAL;
790 goto release;
791 } else
792 af = AF_INET;
793 }
794 laddr = &inp->in6p_laddr;
795 faddr = &inp->in6p_faddr;
796 fport = inp->inp_fport;
797 }
798
799 if (af == AF_INET)
800 hlen = sizeof(struct ip);
801
802 /*
803 * Calculate data length and get a mbuf
804 * for UDP and IP6 headers.
805 */
806 M_PREPEND(m, hlen + sizeof(struct udphdr), M_NOWAIT);
807 if (m == NULL) {
808 error = ENOBUFS;
809 goto release;
810 }
811
812 /*
813 * Stuff checksum and output datagram.
814 */
815 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
816 udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */
817 udp6->uh_dport = fport;
818 if (nxt == IPPROTO_UDPLITE) {
819 struct udpcb *up;
820
821 up = intoudpcb(inp);
822 cscov = up->u_txcslen;
823 if (cscov >= plen)
824 cscov = 0;
825 udp6->uh_ulen = htons(cscov);
826 /*
827 * For UDP-Lite, checksum coverage length of zero means
828 * the entire UDPLite packet is covered by the checksum.
829 */
830 cscov_partial = (cscov == 0) ? 0 : 1;
831 } else if (plen <= 0xffff)
832 udp6->uh_ulen = htons((u_short)plen);
833 else
834 udp6->uh_ulen = 0;
835 udp6->uh_sum = 0;
836
837 switch (af) {
838 case AF_INET6:
839 ip6 = mtod(m, struct ip6_hdr *);
840 ip6->ip6_flow = inp->inp_flow & IPV6_FLOWINFO_MASK;
841 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
842 ip6->ip6_vfc |= IPV6_VERSION;
843 ip6->ip6_plen = htons((u_short)plen);
844 ip6->ip6_nxt = nxt;
845 ip6->ip6_hlim = in6_selecthlim(inp, NULL);
846 ip6->ip6_src = *laddr;
847 ip6->ip6_dst = *faddr;
848
849 if (cscov_partial) {
850 if ((udp6->uh_sum = in6_cksum_partial(m, nxt,
851 sizeof(struct ip6_hdr), plen, cscov)) == 0)
852 udp6->uh_sum = 0xffff;
853 } else {
854 udp6->uh_sum = in6_cksum_pseudo(ip6, plen, nxt, 0);
855 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6;
856 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
857 }
858
859 #ifdef RSS
860 {
861 uint32_t hash_val, hash_type;
862 uint8_t pr;
863
864 pr = inp->inp_socket->so_proto->pr_protocol;
865 /*
866 * Calculate an appropriate RSS hash for UDP and
867 * UDP Lite.
868 *
869 * The called function will take care of figuring out
870 * whether a 2-tuple or 4-tuple hash is required based
871 * on the currently configured scheme.
872 *
873 * Later later on connected socket values should be
874 * cached in the inpcb and reused, rather than constantly
875 * re-calculating it.
876 *
877 * UDP Lite is a different protocol number and will
878 * likely end up being hashed as a 2-tuple until
879 * RSS / NICs grow UDP Lite protocol awareness.
880 */
881 if (rss_proto_software_hash_v6(faddr, laddr, fport,
882 inp->inp_lport, pr, &hash_val, &hash_type) == 0) {
883 m->m_pkthdr.flowid = hash_val;
884 M_HASHTYPE_SET(m, hash_type);
885 }
886 }
887 #endif
888 flags = 0;
889 #ifdef RSS
890 /*
891 * Don't override with the inp cached flowid.
892 *
893 * Until the whole UDP path is vetted, it may actually
894 * be incorrect.
895 */
896 flags |= IP_NODEFAULTFLOWID;
897 #endif
898
899 UDP_PROBE(send, NULL, inp, ip6, inp, udp6);
900 UDPSTAT_INC(udps_opackets);
901 error = ip6_output(m, optp, NULL, flags,
902 inp->in6p_moptions, NULL, inp);
903 break;
904 case AF_INET:
905 error = EAFNOSUPPORT;
906 goto release;
907 }
908 goto releaseopt;
909
910 release:
911 m_freem(m);
912
913 releaseopt:
914 if (control) {
915 ip6_clearpktopts(&opt, -1);
916 m_freem(control);
917 }
918 return (error);
919 }
920
921 static void
922 udp6_abort(struct socket *so)
923 {
924 struct inpcb *inp;
925 struct inpcbinfo *pcbinfo;
926
927 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
928 inp = sotoinpcb(so);
929 KASSERT(inp != NULL, ("udp6_abort: inp == NULL"));
930
931 INP_WLOCK(inp);
932 #ifdef INET
933 if (inp->inp_vflag & INP_IPV4) {
934 struct pr_usrreqs *pru;
935 uint8_t nxt;
936
937 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
938 IPPROTO_UDP : IPPROTO_UDPLITE;
939 INP_WUNLOCK(inp);
940 pru = inetsw[ip_protox[nxt]].pr_usrreqs;
941 (*pru->pru_abort)(so);
942 return;
943 }
944 #endif
945
946 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
947 INP_HASH_WLOCK(pcbinfo);
948 in6_pcbdisconnect(inp);
949 inp->in6p_laddr = in6addr_any;
950 INP_HASH_WUNLOCK(pcbinfo);
951 soisdisconnected(so);
952 }
953 INP_WUNLOCK(inp);
954 }
955
956 static int
957 udp6_attach(struct socket *so, int proto, struct thread *td)
958 {
959 struct inpcb *inp;
960 struct inpcbinfo *pcbinfo;
961 int error;
962
963 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
964 inp = sotoinpcb(so);
965 KASSERT(inp == NULL, ("udp6_attach: inp != NULL"));
966
967 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
968 error = soreserve(so, udp_sendspace, udp_recvspace);
969 if (error)
970 return (error);
971 }
972 INP_INFO_WLOCK(pcbinfo);
973 error = in_pcballoc(so, pcbinfo);
974 if (error) {
975 INP_INFO_WUNLOCK(pcbinfo);
976 return (error);
977 }
978 inp = (struct inpcb *)so->so_pcb;
979 inp->inp_vflag |= INP_IPV6;
980 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
981 inp->inp_vflag |= INP_IPV4;
982 inp->in6p_hops = -1; /* use kernel default */
983 inp->in6p_cksum = -1; /* just to be sure */
984 /*
985 * XXX: ugly!!
986 * IPv4 TTL initialization is necessary for an IPv6 socket as well,
987 * because the socket may be bound to an IPv6 wildcard address,
988 * which may match an IPv4-mapped IPv6 address.
989 */
990 inp->inp_ip_ttl = V_ip_defttl;
991
992 error = udp_newudpcb(inp);
993 if (error) {
994 in_pcbdetach(inp);
995 in_pcbfree(inp);
996 INP_INFO_WUNLOCK(pcbinfo);
997 return (error);
998 }
999 INP_WUNLOCK(inp);
1000 INP_INFO_WUNLOCK(pcbinfo);
1001 return (0);
1002 }
1003
1004 static int
1005 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
1006 {
1007 struct inpcb *inp;
1008 struct inpcbinfo *pcbinfo;
1009 int error;
1010
1011 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1012 inp = sotoinpcb(so);
1013 KASSERT(inp != NULL, ("udp6_bind: inp == NULL"));
1014
1015 INP_WLOCK(inp);
1016 INP_HASH_WLOCK(pcbinfo);
1017 inp->inp_vflag &= ~INP_IPV4;
1018 inp->inp_vflag |= INP_IPV6;
1019 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
1020 struct sockaddr_in6 *sin6_p;
1021
1022 sin6_p = (struct sockaddr_in6 *)nam;
1023
1024 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
1025 inp->inp_vflag |= INP_IPV4;
1026 #ifdef INET
1027 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
1028 struct sockaddr_in sin;
1029
1030 in6_sin6_2_sin(&sin, sin6_p);
1031 inp->inp_vflag |= INP_IPV4;
1032 inp->inp_vflag &= ~INP_IPV6;
1033 error = in_pcbbind(inp, (struct sockaddr *)&sin,
1034 td->td_ucred);
1035 goto out;
1036 }
1037 #endif
1038 }
1039
1040 error = in6_pcbbind(inp, nam, td->td_ucred);
1041 #ifdef INET
1042 out:
1043 #endif
1044 INP_HASH_WUNLOCK(pcbinfo);
1045 INP_WUNLOCK(inp);
1046 return (error);
1047 }
1048
1049 static void
1050 udp6_close(struct socket *so)
1051 {
1052 struct inpcb *inp;
1053 struct inpcbinfo *pcbinfo;
1054
1055 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1056 inp = sotoinpcb(so);
1057 KASSERT(inp != NULL, ("udp6_close: inp == NULL"));
1058
1059 INP_WLOCK(inp);
1060 #ifdef INET
1061 if (inp->inp_vflag & INP_IPV4) {
1062 struct pr_usrreqs *pru;
1063 uint8_t nxt;
1064
1065 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
1066 IPPROTO_UDP : IPPROTO_UDPLITE;
1067 INP_WUNLOCK(inp);
1068 pru = inetsw[ip_protox[nxt]].pr_usrreqs;
1069 (*pru->pru_disconnect)(so);
1070 return;
1071 }
1072 #endif
1073 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1074 INP_HASH_WLOCK(pcbinfo);
1075 in6_pcbdisconnect(inp);
1076 inp->in6p_laddr = in6addr_any;
1077 INP_HASH_WUNLOCK(pcbinfo);
1078 soisdisconnected(so);
1079 }
1080 INP_WUNLOCK(inp);
1081 }
1082
1083 static int
1084 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1085 {
1086 struct inpcb *inp;
1087 struct inpcbinfo *pcbinfo;
1088 struct sockaddr_in6 *sin6;
1089 int error;
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_faddr.s_addr != INADDR_ANY) {
1109 error = EISCONN;
1110 goto out;
1111 }
1112 in6_sin6_2_sin(&sin, sin6);
1113 inp->inp_vflag |= INP_IPV4;
1114 inp->inp_vflag &= ~INP_IPV6;
1115 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr);
1116 if (error != 0)
1117 goto out;
1118 INP_HASH_WLOCK(pcbinfo);
1119 error = in_pcbconnect(inp, (struct sockaddr *)&sin,
1120 td->td_ucred);
1121 INP_HASH_WUNLOCK(pcbinfo);
1122 if (error == 0)
1123 soisconnected(so);
1124 goto out;
1125 }
1126 #endif
1127 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1128 error = EISCONN;
1129 goto out;
1130 }
1131 inp->inp_vflag &= ~INP_IPV4;
1132 inp->inp_vflag |= INP_IPV6;
1133 error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr);
1134 if (error != 0)
1135 goto out;
1136 INP_HASH_WLOCK(pcbinfo);
1137 error = in6_pcbconnect(inp, nam, td->td_ucred);
1138 INP_HASH_WUNLOCK(pcbinfo);
1139 if (error == 0)
1140 soisconnected(so);
1141 out:
1142 INP_WUNLOCK(inp);
1143 return (error);
1144 }
1145
1146 static void
1147 udp6_detach(struct socket *so)
1148 {
1149 struct inpcb *inp;
1150 struct inpcbinfo *pcbinfo;
1151 struct udpcb *up;
1152
1153 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1154 inp = sotoinpcb(so);
1155 KASSERT(inp != NULL, ("udp6_detach: inp == NULL"));
1156
1157 INP_INFO_WLOCK(pcbinfo);
1158 INP_WLOCK(inp);
1159 up = intoudpcb(inp);
1160 KASSERT(up != NULL, ("%s: up == NULL", __func__));
1161 in_pcbdetach(inp);
1162 in_pcbfree(inp);
1163 INP_INFO_WUNLOCK(pcbinfo);
1164 udp_discardcb(up);
1165 }
1166
1167 static int
1168 udp6_disconnect(struct socket *so)
1169 {
1170 struct inpcb *inp;
1171 struct inpcbinfo *pcbinfo;
1172 int error;
1173
1174 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1175 inp = sotoinpcb(so);
1176 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL"));
1177
1178 INP_WLOCK(inp);
1179 #ifdef INET
1180 if (inp->inp_vflag & INP_IPV4) {
1181 struct pr_usrreqs *pru;
1182 uint8_t nxt;
1183
1184 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
1185 IPPROTO_UDP : IPPROTO_UDPLITE;
1186 INP_WUNLOCK(inp);
1187 pru = inetsw[ip_protox[nxt]].pr_usrreqs;
1188 (void)(*pru->pru_disconnect)(so);
1189 return (0);
1190 }
1191 #endif
1192
1193 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1194 error = ENOTCONN;
1195 goto out;
1196 }
1197
1198 INP_HASH_WLOCK(pcbinfo);
1199 in6_pcbdisconnect(inp);
1200 inp->in6p_laddr = in6addr_any;
1201 INP_HASH_WUNLOCK(pcbinfo);
1202 SOCK_LOCK(so);
1203 so->so_state &= ~SS_ISCONNECTED; /* XXX */
1204 SOCK_UNLOCK(so);
1205 out:
1206 INP_WUNLOCK(inp);
1207 return (0);
1208 }
1209
1210 static int
1211 udp6_send(struct socket *so, int flags, struct mbuf *m,
1212 struct sockaddr *addr, struct mbuf *control, struct thread *td)
1213 {
1214 struct inpcb *inp;
1215 struct inpcbinfo *pcbinfo;
1216 int error = 0;
1217
1218 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1219 inp = sotoinpcb(so);
1220 KASSERT(inp != NULL, ("udp6_send: inp == NULL"));
1221
1222 INP_WLOCK(inp);
1223 if (addr) {
1224 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
1225 error = EINVAL;
1226 goto bad;
1227 }
1228 if (addr->sa_family != AF_INET6) {
1229 error = EAFNOSUPPORT;
1230 goto bad;
1231 }
1232 }
1233
1234 #ifdef INET
1235 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
1236 int hasv4addr;
1237 struct sockaddr_in6 *sin6 = NULL;
1238
1239 if (addr == NULL)
1240 hasv4addr = (inp->inp_vflag & INP_IPV4);
1241 else {
1242 sin6 = (struct sockaddr_in6 *)addr;
1243 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
1244 ? 1 : 0;
1245 }
1246 if (hasv4addr) {
1247 struct pr_usrreqs *pru;
1248 uint8_t nxt;
1249
1250 nxt = (inp->inp_socket->so_proto->pr_protocol ==
1251 IPPROTO_UDP) ? IPPROTO_UDP : IPPROTO_UDPLITE;
1252 /*
1253 * XXXRW: We release UDP-layer locks before calling
1254 * udp_send() in order to avoid recursion. However,
1255 * this does mean there is a short window where inp's
1256 * fields are unstable. Could this lead to a
1257 * potential race in which the factors causing us to
1258 * select the UDPv4 output routine are invalidated?
1259 */
1260 INP_WUNLOCK(inp);
1261 if (sin6)
1262 in6_sin6_2_sin_in_sock(addr);
1263 pru = inetsw[ip_protox[nxt]].pr_usrreqs;
1264 /* addr will just be freed in sendit(). */
1265 return ((*pru->pru_send)(so, flags, m, addr, control,
1266 td));
1267 }
1268 }
1269 #endif
1270 #ifdef MAC
1271 mac_inpcb_create_mbuf(inp, m);
1272 #endif
1273 INP_HASH_WLOCK(pcbinfo);
1274 error = udp6_output(inp, m, addr, control, td);
1275 INP_HASH_WUNLOCK(pcbinfo);
1276 INP_WUNLOCK(inp);
1277 return (error);
1278
1279 bad:
1280 INP_WUNLOCK(inp);
1281 m_freem(m);
1282 return (error);
1283 }
1284
1285 struct pr_usrreqs udp6_usrreqs = {
1286 .pru_abort = udp6_abort,
1287 .pru_attach = udp6_attach,
1288 .pru_bind = udp6_bind,
1289 .pru_connect = udp6_connect,
1290 .pru_control = in6_control,
1291 .pru_detach = udp6_detach,
1292 .pru_disconnect = udp6_disconnect,
1293 .pru_peeraddr = in6_mapped_peeraddr,
1294 .pru_send = udp6_send,
1295 .pru_shutdown = udp_shutdown,
1296 .pru_sockaddr = in6_mapped_sockaddr,
1297 .pru_soreceive = soreceive_dgram,
1298 .pru_sosend = sosend_dgram,
1299 .pru_sosetlabel = in_pcbsosetlabel,
1300 .pru_close = udp6_close
1301 };
Cache object: 742493cdcc50ffbe17ca509b5864716e
|