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("$FreeBSD$");
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
udp6_append(struct inpcb * inp,struct mbuf * n,int off,struct sockaddr_in6 * fromsa)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
udp6_input(struct mbuf ** mp,int * offp,int proto)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 UDP_PROBE(receive, NULL, NULL, ip6, NULL, uh);
460 UDPSTAT_INC(udps_noport);
461 if (m->m_flags & M_MCAST) {
462 printf("UDP6: M_MCAST is set in a unicast packet.\n");
463 UDPSTAT_INC(udps_noportmcast);
464 goto badunlocked;
465 }
466 if (V_udp_blackhole)
467 goto badunlocked;
468 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
469 return (IPPROTO_DONE);
470 }
471 INP_RLOCK_ASSERT(inp);
472 up = intoudpcb(inp);
473 if (cscov_partial) {
474 if (up->u_rxcslen == 0 || up->u_rxcslen > ulen) {
475 INP_RUNLOCK(inp);
476 m_freem(m);
477 return (IPPROTO_DONE);
478 }
479 }
480 UDP_PROBE(receive, NULL, inp, ip6, inp, uh);
481 if (udp6_append(inp, m, off, &fromsa) == 0)
482 INP_RUNLOCK(inp);
483 return (IPPROTO_DONE);
484
485 badheadlocked:
486 INP_INFO_RUNLOCK(pcbinfo);
487 badunlocked:
488 if (m)
489 m_freem(m);
490 return (IPPROTO_DONE);
491 }
492
493 static void
udp6_common_ctlinput(int cmd,struct sockaddr * sa,void * d,struct inpcbinfo * pcbinfo)494 udp6_common_ctlinput(int cmd, struct sockaddr *sa, void *d,
495 struct inpcbinfo *pcbinfo)
496 {
497 struct udphdr uh;
498 struct ip6_hdr *ip6;
499 struct mbuf *m;
500 int off = 0;
501 struct ip6ctlparam *ip6cp = NULL;
502 const struct sockaddr_in6 *sa6_src = NULL;
503 void *cmdarg;
504 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify;
505 struct udp_portonly {
506 u_int16_t uh_sport;
507 u_int16_t uh_dport;
508 } *uhp;
509
510 if (sa->sa_family != AF_INET6 ||
511 sa->sa_len != sizeof(struct sockaddr_in6))
512 return;
513
514 if ((unsigned)cmd >= PRC_NCMDS)
515 return;
516 if (PRC_IS_REDIRECT(cmd))
517 notify = in6_rtchange, d = NULL;
518 else if (cmd == PRC_HOSTDEAD)
519 d = NULL;
520 else if (inet6ctlerrmap[cmd] == 0)
521 return;
522
523 /* if the parameter is from icmp6, decode it. */
524 if (d != NULL) {
525 ip6cp = (struct ip6ctlparam *)d;
526 m = ip6cp->ip6c_m;
527 ip6 = ip6cp->ip6c_ip6;
528 off = ip6cp->ip6c_off;
529 cmdarg = ip6cp->ip6c_cmdarg;
530 sa6_src = ip6cp->ip6c_src;
531 } else {
532 m = NULL;
533 ip6 = NULL;
534 cmdarg = NULL;
535 sa6_src = &sa6_any;
536 }
537
538 if (ip6) {
539 /*
540 * XXX: We assume that when IPV6 is non NULL,
541 * M and OFF are valid.
542 */
543
544 /* Check if we can safely examine src and dst ports. */
545 if (m->m_pkthdr.len < off + sizeof(*uhp))
546 return;
547
548 bzero(&uh, sizeof(uh));
549 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
550
551 if (!PRC_IS_REDIRECT(cmd)) {
552 /* Check to see if its tunneled */
553 struct inpcb *inp;
554 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_dst,
555 uh.uh_dport, &ip6->ip6_src, uh.uh_sport,
556 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB,
557 m->m_pkthdr.rcvif, m);
558 if (inp != NULL) {
559 struct udpcb *up;
560
561 up = intoudpcb(inp);
562 if (up->u_icmp_func) {
563 /* Yes it is. */
564 INP_RUNLOCK(inp);
565 (*up->u_icmp_func)(cmd, (struct sockaddr *)ip6cp->ip6c_src,
566 d, up->u_tun_ctx);
567 return;
568 } else {
569 /* Can't find it. */
570 INP_RUNLOCK(inp);
571 }
572 }
573 }
574 (void)in6_pcbnotify(pcbinfo, sa, uh.uh_dport,
575 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd,
576 cmdarg, notify);
577 } else
578 (void)in6_pcbnotify(pcbinfo, sa, 0,
579 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
580 }
581
582 void
udp6_ctlinput(int cmd,struct sockaddr * sa,void * d)583 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
584 {
585
586 return (udp6_common_ctlinput(cmd, sa, d, &V_udbinfo));
587 }
588
589 void
udplite6_ctlinput(int cmd,struct sockaddr * sa,void * d)590 udplite6_ctlinput(int cmd, struct sockaddr *sa, void *d)
591 {
592
593 return (udp6_common_ctlinput(cmd, sa, d, &V_ulitecbinfo));
594 }
595
596 static int
udp6_getcred(SYSCTL_HANDLER_ARGS)597 udp6_getcred(SYSCTL_HANDLER_ARGS)
598 {
599 struct xucred xuc;
600 struct sockaddr_in6 addrs[2];
601 struct inpcb *inp;
602 int error;
603
604 error = priv_check(req->td, PRIV_NETINET_GETCRED);
605 if (error)
606 return (error);
607
608 if (req->newlen != sizeof(addrs))
609 return (EINVAL);
610 if (req->oldlen != sizeof(struct xucred))
611 return (EINVAL);
612 error = SYSCTL_IN(req, addrs, sizeof(addrs));
613 if (error)
614 return (error);
615 if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 ||
616 (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) {
617 return (error);
618 }
619 inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr,
620 addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port,
621 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
622 if (inp != NULL) {
623 INP_RLOCK_ASSERT(inp);
624 if (inp->inp_socket == NULL)
625 error = ENOENT;
626 if (error == 0)
627 error = cr_canseesocket(req->td->td_ucred,
628 inp->inp_socket);
629 if (error == 0)
630 cru2x(inp->inp_cred, &xuc);
631 INP_RUNLOCK(inp);
632 } else
633 error = ENOENT;
634 if (error == 0)
635 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
636 return (error);
637 }
638
639 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0,
640 0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection");
641
642 static int
udp6_output(struct inpcb * inp,struct mbuf * m,struct sockaddr * addr6,struct mbuf * control,struct thread * td)643 udp6_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr6,
644 struct mbuf *control, struct thread *td)
645 {
646 u_int32_t ulen = m->m_pkthdr.len;
647 u_int32_t plen = sizeof(struct udphdr) + ulen;
648 struct ip6_hdr *ip6;
649 struct udphdr *udp6;
650 struct in6_addr *laddr, *faddr, in6a;
651 struct sockaddr_in6 *sin6 = NULL;
652 int cscov_partial = 0;
653 int scope_ambiguous = 0;
654 u_short fport;
655 int error = 0;
656 uint8_t nxt;
657 uint16_t cscov = 0;
658 struct ip6_pktopts *optp, opt;
659 int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
660 int flags;
661 struct sockaddr_in6 tmp;
662
663 INP_WLOCK_ASSERT(inp);
664 INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
665
666 if (addr6) {
667 /* addr6 has been validated in udp6_send(). */
668 sin6 = (struct sockaddr_in6 *)addr6;
669
670 /* protect *sin6 from overwrites */
671 tmp = *sin6;
672 sin6 = &tmp;
673
674 /*
675 * Application should provide a proper zone ID or the use of
676 * default zone IDs should be enabled. Unfortunately, some
677 * applications do not behave as it should, so we need a
678 * workaround. Even if an appropriate ID is not determined,
679 * we'll see if we can determine the outgoing interface. If we
680 * can, determine the zone ID based on the interface below.
681 */
682 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone)
683 scope_ambiguous = 1;
684 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
685 return (error);
686 }
687
688 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
689 IPPROTO_UDP : IPPROTO_UDPLITE;
690 if (control) {
691 if ((error = ip6_setpktopts(control, &opt,
692 inp->in6p_outputopts, td->td_ucred, nxt)) != 0)
693 goto release;
694 optp = &opt;
695 } else
696 optp = inp->in6p_outputopts;
697
698 if (sin6) {
699 faddr = &sin6->sin6_addr;
700
701 /*
702 * Since we saw no essential reason for calling in_pcbconnect,
703 * we get rid of such kind of logic, and call in6_selectsrc
704 * and in6_pcbsetport in order to fill in the local address
705 * and the local port.
706 */
707 if (sin6->sin6_port == 0) {
708 error = EADDRNOTAVAIL;
709 goto release;
710 }
711
712 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
713 /* how about ::ffff:0.0.0.0 case? */
714 error = EISCONN;
715 goto release;
716 }
717
718 fport = sin6->sin6_port; /* allow 0 port */
719
720 if (IN6_IS_ADDR_V4MAPPED(faddr)) {
721 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
722 /*
723 * I believe we should explicitly discard the
724 * packet when mapped addresses are disabled,
725 * rather than send the packet as an IPv6 one.
726 * If we chose the latter approach, the packet
727 * might be sent out on the wire based on the
728 * default route, the situation which we'd
729 * probably want to avoid.
730 * (20010421 jinmei@kame.net)
731 */
732 error = EINVAL;
733 goto release;
734 }
735 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
736 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) {
737 /*
738 * when remote addr is an IPv4-mapped address,
739 * local addr should not be an IPv6 address,
740 * since you cannot determine how to map IPv6
741 * source address to IPv4.
742 */
743 error = EINVAL;
744 goto release;
745 }
746
747 af = AF_INET;
748 }
749
750 if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
751 error = in6_selectsrc_socket(sin6, optp, inp,
752 td->td_ucred, scope_ambiguous, &in6a, NULL);
753 if (error)
754 goto release;
755 laddr = &in6a;
756 } else
757 laddr = &inp->in6p_laddr; /* XXX */
758 if (laddr == NULL) {
759 if (error == 0)
760 error = EADDRNOTAVAIL;
761 goto release;
762 }
763 if (inp->inp_lport == 0 &&
764 (error = in6_pcbsetport(laddr, inp, td->td_ucred)) != 0) {
765 /* Undo an address bind that may have occurred. */
766 inp->in6p_laddr = in6addr_any;
767 goto release;
768 }
769 } else {
770 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
771 error = ENOTCONN;
772 goto release;
773 }
774 if (IN6_IS_ADDR_V4MAPPED(&inp->in6p_faddr)) {
775 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
776 /*
777 * XXX: this case would happen when the
778 * application sets the V6ONLY flag after
779 * connecting the foreign address.
780 * Such applications should be fixed,
781 * so we bark here.
782 */
783 log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
784 "option was set for a connected socket\n");
785 error = EINVAL;
786 goto release;
787 } else
788 af = AF_INET;
789 }
790 laddr = &inp->in6p_laddr;
791 faddr = &inp->in6p_faddr;
792 fport = inp->inp_fport;
793 }
794
795 if (af == AF_INET)
796 hlen = sizeof(struct ip);
797
798 /*
799 * Calculate data length and get a mbuf
800 * for UDP and IP6 headers.
801 */
802 M_PREPEND(m, hlen + sizeof(struct udphdr), M_NOWAIT);
803 if (m == NULL) {
804 error = ENOBUFS;
805 goto release;
806 }
807
808 /*
809 * Stuff checksum and output datagram.
810 */
811 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
812 udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */
813 udp6->uh_dport = fport;
814 if (nxt == IPPROTO_UDPLITE) {
815 struct udpcb *up;
816
817 up = intoudpcb(inp);
818 cscov = up->u_txcslen;
819 if (cscov >= plen)
820 cscov = 0;
821 udp6->uh_ulen = htons(cscov);
822 /*
823 * For UDP-Lite, checksum coverage length of zero means
824 * the entire UDPLite packet is covered by the checksum.
825 */
826 cscov_partial = (cscov == 0) ? 0 : 1;
827 } else if (plen <= 0xffff)
828 udp6->uh_ulen = htons((u_short)plen);
829 else
830 udp6->uh_ulen = 0;
831 udp6->uh_sum = 0;
832
833 switch (af) {
834 case AF_INET6:
835 ip6 = mtod(m, struct ip6_hdr *);
836 ip6->ip6_flow = inp->inp_flow & IPV6_FLOWINFO_MASK;
837 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
838 ip6->ip6_vfc |= IPV6_VERSION;
839 ip6->ip6_plen = htons((u_short)plen);
840 ip6->ip6_nxt = nxt;
841 ip6->ip6_hlim = in6_selecthlim(inp, NULL);
842 ip6->ip6_src = *laddr;
843 ip6->ip6_dst = *faddr;
844
845 if (cscov_partial) {
846 if ((udp6->uh_sum = in6_cksum_partial(m, nxt,
847 sizeof(struct ip6_hdr), plen, cscov)) == 0)
848 udp6->uh_sum = 0xffff;
849 } else {
850 udp6->uh_sum = in6_cksum_pseudo(ip6, plen, nxt, 0);
851 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6;
852 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
853 }
854
855 #ifdef RSS
856 {
857 uint32_t hash_val, hash_type;
858 uint8_t pr;
859
860 pr = inp->inp_socket->so_proto->pr_protocol;
861 /*
862 * Calculate an appropriate RSS hash for UDP and
863 * UDP Lite.
864 *
865 * The called function will take care of figuring out
866 * whether a 2-tuple or 4-tuple hash is required based
867 * on the currently configured scheme.
868 *
869 * Later later on connected socket values should be
870 * cached in the inpcb and reused, rather than constantly
871 * re-calculating it.
872 *
873 * UDP Lite is a different protocol number and will
874 * likely end up being hashed as a 2-tuple until
875 * RSS / NICs grow UDP Lite protocol awareness.
876 */
877 if (rss_proto_software_hash_v6(faddr, laddr, fport,
878 inp->inp_lport, pr, &hash_val, &hash_type) == 0) {
879 m->m_pkthdr.flowid = hash_val;
880 M_HASHTYPE_SET(m, hash_type);
881 }
882 }
883 #endif
884 flags = 0;
885 #ifdef RSS
886 /*
887 * Don't override with the inp cached flowid.
888 *
889 * Until the whole UDP path is vetted, it may actually
890 * be incorrect.
891 */
892 flags |= IP_NODEFAULTFLOWID;
893 #endif
894
895 UDP_PROBE(send, NULL, inp, ip6, inp, udp6);
896 UDPSTAT_INC(udps_opackets);
897 error = ip6_output(m, optp, &inp->inp_route6, flags,
898 inp->in6p_moptions, NULL, inp);
899 break;
900 case AF_INET:
901 error = EAFNOSUPPORT;
902 goto release;
903 }
904 goto releaseopt;
905
906 release:
907 m_freem(m);
908
909 releaseopt:
910 if (control) {
911 ip6_clearpktopts(&opt, -1);
912 m_freem(control);
913 }
914 return (error);
915 }
916
917 static void
udp6_abort(struct socket * so)918 udp6_abort(struct socket *so)
919 {
920 struct inpcb *inp;
921 struct inpcbinfo *pcbinfo;
922
923 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
924 inp = sotoinpcb(so);
925 KASSERT(inp != NULL, ("udp6_abort: inp == NULL"));
926
927 INP_WLOCK(inp);
928 #ifdef INET
929 if (inp->inp_vflag & INP_IPV4) {
930 struct pr_usrreqs *pru;
931 uint8_t nxt;
932
933 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
934 IPPROTO_UDP : IPPROTO_UDPLITE;
935 INP_WUNLOCK(inp);
936 pru = inetsw[ip_protox[nxt]].pr_usrreqs;
937 (*pru->pru_abort)(so);
938 return;
939 }
940 #endif
941
942 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
943 INP_HASH_WLOCK(pcbinfo);
944 in6_pcbdisconnect(inp);
945 inp->in6p_laddr = in6addr_any;
946 INP_HASH_WUNLOCK(pcbinfo);
947 soisdisconnected(so);
948 }
949 INP_WUNLOCK(inp);
950 }
951
952 static int
udp6_attach(struct socket * so,int proto,struct thread * td)953 udp6_attach(struct socket *so, int proto, struct thread *td)
954 {
955 struct inpcb *inp;
956 struct inpcbinfo *pcbinfo;
957 int error;
958
959 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
960 inp = sotoinpcb(so);
961 KASSERT(inp == NULL, ("udp6_attach: inp != NULL"));
962
963 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
964 error = soreserve(so, udp_sendspace, udp_recvspace);
965 if (error)
966 return (error);
967 }
968 INP_INFO_WLOCK(pcbinfo);
969 error = in_pcballoc(so, pcbinfo);
970 if (error) {
971 INP_INFO_WUNLOCK(pcbinfo);
972 return (error);
973 }
974 inp = (struct inpcb *)so->so_pcb;
975 inp->inp_vflag |= INP_IPV6;
976 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
977 inp->inp_vflag |= INP_IPV4;
978 inp->in6p_hops = -1; /* use kernel default */
979 inp->in6p_cksum = -1; /* just to be sure */
980 /*
981 * XXX: ugly!!
982 * IPv4 TTL initialization is necessary for an IPv6 socket as well,
983 * because the socket may be bound to an IPv6 wildcard address,
984 * which may match an IPv4-mapped IPv6 address.
985 */
986 inp->inp_ip_ttl = V_ip_defttl;
987
988 error = udp_newudpcb(inp);
989 if (error) {
990 in_pcbdetach(inp);
991 in_pcbfree(inp);
992 INP_INFO_WUNLOCK(pcbinfo);
993 return (error);
994 }
995 INP_WUNLOCK(inp);
996 INP_INFO_WUNLOCK(pcbinfo);
997 return (0);
998 }
999
1000 static int
udp6_bind(struct socket * so,struct sockaddr * nam,struct thread * td)1001 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
1002 {
1003 struct inpcb *inp;
1004 struct inpcbinfo *pcbinfo;
1005 int error;
1006 u_char vflagsav;
1007
1008 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1009 inp = sotoinpcb(so);
1010 KASSERT(inp != NULL, ("udp6_bind: inp == NULL"));
1011
1012 INP_WLOCK(inp);
1013 INP_HASH_WLOCK(pcbinfo);
1014 vflagsav = inp->inp_vflag;
1015 inp->inp_vflag &= ~INP_IPV4;
1016 inp->inp_vflag |= INP_IPV6;
1017 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
1018 struct sockaddr_in6 *sin6_p;
1019
1020 sin6_p = (struct sockaddr_in6 *)nam;
1021
1022 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
1023 inp->inp_vflag |= INP_IPV4;
1024 #ifdef INET
1025 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
1026 struct sockaddr_in sin;
1027
1028 in6_sin6_2_sin(&sin, sin6_p);
1029 inp->inp_vflag |= INP_IPV4;
1030 inp->inp_vflag &= ~INP_IPV6;
1031 error = in_pcbbind(inp, (struct sockaddr *)&sin,
1032 td->td_ucred);
1033 goto out;
1034 }
1035 #endif
1036 }
1037
1038 error = in6_pcbbind(inp, nam, td->td_ucred);
1039 #ifdef INET
1040 out:
1041 #endif
1042 if (error != 0)
1043 inp->inp_vflag = vflagsav;
1044 INP_HASH_WUNLOCK(pcbinfo);
1045 INP_WUNLOCK(inp);
1046 return (error);
1047 }
1048
1049 static void
udp6_close(struct socket * so)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
udp6_connect(struct socket * so,struct sockaddr * nam,struct thread * td)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 u_char vflagsav;
1091
1092 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1093 inp = sotoinpcb(so);
1094 sin6 = (struct sockaddr_in6 *)nam;
1095 KASSERT(inp != NULL, ("udp6_connect: inp == NULL"));
1096
1097 /*
1098 * XXXRW: Need to clarify locking of v4/v6 flags.
1099 */
1100 INP_WLOCK(inp);
1101 #ifdef INET
1102 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
1103 struct sockaddr_in sin;
1104
1105 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
1106 error = EINVAL;
1107 goto out;
1108 }
1109 if ((inp->inp_vflag & INP_IPV4) == 0) {
1110 error = EAFNOSUPPORT;
1111 goto out;
1112 }
1113 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1114 error = EISCONN;
1115 goto out;
1116 }
1117 in6_sin6_2_sin(&sin, sin6);
1118 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr);
1119 if (error != 0)
1120 goto out;
1121 vflagsav = inp->inp_vflag;
1122 inp->inp_vflag |= INP_IPV4;
1123 inp->inp_vflag &= ~INP_IPV6;
1124 INP_HASH_WLOCK(pcbinfo);
1125 error = in_pcbconnect(inp, (struct sockaddr *)&sin,
1126 td->td_ucred);
1127 INP_HASH_WUNLOCK(pcbinfo);
1128 /*
1129 * If connect succeeds, mark socket as connected. If
1130 * connect fails and socket is unbound, reset inp_vflag
1131 * field.
1132 */
1133 if (error == 0)
1134 soisconnected(so);
1135 else if (inp->inp_laddr.s_addr == INADDR_ANY &&
1136 inp->inp_lport == 0)
1137 inp->inp_vflag = vflagsav;
1138 goto out;
1139 } else {
1140 if ((inp->inp_vflag & INP_IPV6) == 0) {
1141 error = EAFNOSUPPORT;
1142 goto out;
1143 }
1144 }
1145 #endif
1146 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1147 error = EISCONN;
1148 goto out;
1149 }
1150 error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr);
1151 if (error != 0)
1152 goto out;
1153 vflagsav = inp->inp_vflag;
1154 inp->inp_vflag &= ~INP_IPV4;
1155 inp->inp_vflag |= INP_IPV6;
1156 INP_HASH_WLOCK(pcbinfo);
1157 error = in6_pcbconnect(inp, nam, td->td_ucred);
1158 INP_HASH_WUNLOCK(pcbinfo);
1159 /*
1160 * If connect succeeds, mark socket as connected. If
1161 * connect fails and socket is unbound, reset inp_vflag
1162 * field.
1163 */
1164 if (error == 0)
1165 soisconnected(so);
1166 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
1167 inp->inp_lport == 0)
1168 inp->inp_vflag = vflagsav;
1169 out:
1170 INP_WUNLOCK(inp);
1171 return (error);
1172 }
1173
1174 static void
udp6_detach(struct socket * so)1175 udp6_detach(struct socket *so)
1176 {
1177 struct inpcb *inp;
1178 struct inpcbinfo *pcbinfo;
1179 struct udpcb *up;
1180
1181 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1182 inp = sotoinpcb(so);
1183 KASSERT(inp != NULL, ("udp6_detach: inp == NULL"));
1184
1185 INP_INFO_WLOCK(pcbinfo);
1186 INP_WLOCK(inp);
1187 up = intoudpcb(inp);
1188 KASSERT(up != NULL, ("%s: up == NULL", __func__));
1189 in_pcbdetach(inp);
1190 in_pcbfree(inp);
1191 INP_INFO_WUNLOCK(pcbinfo);
1192 udp_discardcb(up);
1193 }
1194
1195 static int
udp6_disconnect(struct socket * so)1196 udp6_disconnect(struct socket *so)
1197 {
1198 struct inpcb *inp;
1199 struct inpcbinfo *pcbinfo;
1200 int error;
1201
1202 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1203 inp = sotoinpcb(so);
1204 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL"));
1205
1206 INP_WLOCK(inp);
1207 #ifdef INET
1208 if (inp->inp_vflag & INP_IPV4) {
1209 struct pr_usrreqs *pru;
1210 uint8_t nxt;
1211
1212 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
1213 IPPROTO_UDP : IPPROTO_UDPLITE;
1214 INP_WUNLOCK(inp);
1215 pru = inetsw[ip_protox[nxt]].pr_usrreqs;
1216 (void)(*pru->pru_disconnect)(so);
1217 return (0);
1218 }
1219 #endif
1220
1221 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1222 error = ENOTCONN;
1223 goto out;
1224 }
1225
1226 INP_HASH_WLOCK(pcbinfo);
1227 in6_pcbdisconnect(inp);
1228 inp->in6p_laddr = in6addr_any;
1229 INP_HASH_WUNLOCK(pcbinfo);
1230 SOCK_LOCK(so);
1231 so->so_state &= ~SS_ISCONNECTED; /* XXX */
1232 SOCK_UNLOCK(so);
1233 out:
1234 INP_WUNLOCK(inp);
1235 return (0);
1236 }
1237
1238 static int
udp6_send(struct socket * so,int flags,struct mbuf * m,struct sockaddr * addr,struct mbuf * control,struct thread * td)1239 udp6_send(struct socket *so, int flags, struct mbuf *m,
1240 struct sockaddr *addr, struct mbuf *control, struct thread *td)
1241 {
1242 struct inpcb *inp;
1243 struct inpcbinfo *pcbinfo;
1244 int error = 0;
1245
1246 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1247 inp = sotoinpcb(so);
1248 KASSERT(inp != NULL, ("udp6_send: inp == NULL"));
1249
1250 INP_WLOCK(inp);
1251 if (addr) {
1252 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
1253 error = EINVAL;
1254 goto bad;
1255 }
1256 if (addr->sa_family != AF_INET6) {
1257 error = EAFNOSUPPORT;
1258 goto bad;
1259 }
1260 }
1261
1262 #ifdef INET
1263 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
1264 int hasv4addr;
1265 struct sockaddr_in6 *sin6 = NULL;
1266
1267 if (addr == NULL)
1268 hasv4addr = (inp->inp_vflag & INP_IPV4);
1269 else {
1270 sin6 = (struct sockaddr_in6 *)addr;
1271 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
1272 ? 1 : 0;
1273 }
1274 if (hasv4addr) {
1275 struct pr_usrreqs *pru;
1276 uint8_t nxt;
1277
1278 nxt = (inp->inp_socket->so_proto->pr_protocol ==
1279 IPPROTO_UDP) ? IPPROTO_UDP : IPPROTO_UDPLITE;
1280 /*
1281 * XXXRW: We release UDP-layer locks before calling
1282 * udp_send() in order to avoid recursion. However,
1283 * this does mean there is a short window where inp's
1284 * fields are unstable. Could this lead to a
1285 * potential race in which the factors causing us to
1286 * select the UDPv4 output routine are invalidated?
1287 */
1288 INP_WUNLOCK(inp);
1289 if (sin6)
1290 in6_sin6_2_sin_in_sock(addr);
1291 pru = inetsw[ip_protox[nxt]].pr_usrreqs;
1292 /* addr will just be freed in sendit(). */
1293 return ((*pru->pru_send)(so, flags, m, addr, control,
1294 td));
1295 }
1296 }
1297 #endif
1298 #ifdef MAC
1299 mac_inpcb_create_mbuf(inp, m);
1300 #endif
1301 INP_HASH_WLOCK(pcbinfo);
1302 error = udp6_output(inp, m, addr, control, td);
1303 INP_HASH_WUNLOCK(pcbinfo);
1304 INP_WUNLOCK(inp);
1305 return (error);
1306
1307 bad:
1308 INP_WUNLOCK(inp);
1309 m_freem(m);
1310 return (error);
1311 }
1312
1313 struct pr_usrreqs udp6_usrreqs = {
1314 .pru_abort = udp6_abort,
1315 .pru_attach = udp6_attach,
1316 .pru_bind = udp6_bind,
1317 .pru_connect = udp6_connect,
1318 .pru_control = in6_control,
1319 .pru_detach = udp6_detach,
1320 .pru_disconnect = udp6_disconnect,
1321 .pru_peeraddr = in6_mapped_peeraddr,
1322 .pru_send = udp6_send,
1323 .pru_shutdown = udp_shutdown,
1324 .pru_sockaddr = in6_mapped_sockaddr,
1325 .pru_soreceive = soreceive_dgram,
1326 .pru_sosend = sosend_dgram,
1327 .pru_sosetlabel = in_pcbsosetlabel,
1328 .pru_close = udp6_close
1329 };
1330