1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * Copyright (c) 2010-2011 Juniper Networks, Inc.
6 * Copyright (c) 2014 Kevin Lo
7 * All rights reserved.
8 *
9 * Portions of this software were developed by Robert N. M. Watson under
10 * contract to Juniper Networks, Inc.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the project nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $
37 * $KAME: udp6_output.c,v 1.31 2001/05/21 16:39:15 jinmei Exp $
38 */
39
40 /*-
41 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
42 * The Regents of the University of California.
43 * All rights reserved.
44 *
45 * Redistribution and use in source and binary forms, with or without
46 * modification, are permitted provided that the following conditions
47 * are met:
48 * 1. Redistributions of source code must retain the above copyright
49 * notice, this list of conditions and the following disclaimer.
50 * 2. Redistributions in binary form must reproduce the above copyright
51 * notice, this list of conditions and the following disclaimer in the
52 * documentation and/or other materials provided with the distribution.
53 * 3. Neither the name of the University nor the names of its contributors
54 * may be used to endorse or promote products derived from this software
55 * without specific prior written permission.
56 *
57 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
58 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
59 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
60 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
61 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
62 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
63 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
64 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
65 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
66 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
67 * SUCH DAMAGE.
68 *
69 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95
70 */
71
72 #include <sys/cdefs.h>
73 __FBSDID("$FreeBSD$");
74
75 #include "opt_inet.h"
76 #include "opt_inet6.h"
77 #include "opt_ipsec.h"
78 #include "opt_route.h"
79 #include "opt_rss.h"
80
81 #include <sys/param.h>
82 #include <sys/jail.h>
83 #include <sys/kernel.h>
84 #include <sys/lock.h>
85 #include <sys/mbuf.h>
86 #include <sys/priv.h>
87 #include <sys/proc.h>
88 #include <sys/protosw.h>
89 #include <sys/sdt.h>
90 #include <sys/signalvar.h>
91 #include <sys/socket.h>
92 #include <sys/socketvar.h>
93 #include <sys/sx.h>
94 #include <sys/sysctl.h>
95 #include <sys/syslog.h>
96 #include <sys/systm.h>
97
98 #include <net/if.h>
99 #include <net/if_var.h>
100 #include <net/if_types.h>
101 #include <net/route.h>
102 #include <net/rss_config.h>
103
104 #include <netinet/in.h>
105 #include <netinet/in_kdtrace.h>
106 #include <netinet/in_pcb.h>
107 #include <netinet/in_systm.h>
108 #include <netinet/in_var.h>
109 #include <netinet/ip.h>
110 #include <netinet/ip6.h>
111 #include <netinet/icmp6.h>
112 #include <netinet/ip_var.h>
113 #include <netinet/udp.h>
114 #include <netinet/udp_var.h>
115 #include <netinet/udplite.h>
116
117 #include <netinet6/ip6protosw.h>
118 #include <netinet6/ip6_var.h>
119 #include <netinet6/in6_fib.h>
120 #include <netinet6/in6_pcb.h>
121 #include <netinet6/in6_rss.h>
122 #include <netinet6/udp6_var.h>
123 #include <netinet6/scope6_var.h>
124
125 #include <netipsec/ipsec_support.h>
126
127 #include <security/mac/mac_framework.h>
128
129 VNET_DEFINE(int, zero_checksum_port) = 0;
130 #define V_zero_checksum_port VNET(zero_checksum_port)
131 SYSCTL_INT(_net_inet6_udp6, OID_AUTO, rfc6935_port, CTLFLAG_VNET | CTLFLAG_RW,
132 &VNET_NAME(zero_checksum_port), 0,
133 "Zero UDP checksum allowed for traffic to/from this port.");
134 /*
135 * UDP protocol implementation.
136 * Per RFC 768, August, 1980.
137 */
138
139 extern struct protosw inetsw[];
140 static void udp6_detach(struct socket *so);
141
142 static int
143 udp6_append(struct inpcb *inp, struct mbuf *n, int off,
144 struct sockaddr_in6 *fromsa)
145 {
146 struct socket *so;
147 struct mbuf *opts = NULL, *tmp_opts;
148 struct udpcb *up;
149
150 INP_LOCK_ASSERT(inp);
151
152 /*
153 * Engage the tunneling protocol.
154 */
155 up = intoudpcb(inp);
156 if (up->u_tun_func != NULL) {
157 in_pcbref(inp);
158 INP_RUNLOCK(inp);
159 (*up->u_tun_func)(n, off, inp, (struct sockaddr *)&fromsa[0],
160 up->u_tun_ctx);
161 INP_RLOCK(inp);
162 return (in_pcbrele_rlocked(inp));
163 }
164 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
165 /* Check AH/ESP integrity. */
166 if (IPSEC_ENABLED(ipv6)) {
167 if (IPSEC_CHECK_POLICY(ipv6, n, inp) != 0) {
168 m_freem(n);
169 return (0);
170 }
171 }
172 #endif /* IPSEC */
173 #ifdef MAC
174 if (mac_inpcb_check_deliver(inp, n) != 0) {
175 m_freem(n);
176 return (0);
177 }
178 #endif
179 opts = NULL;
180 if (inp->inp_flags & INP_CONTROLOPTS ||
181 inp->inp_socket->so_options & SO_TIMESTAMP)
182 ip6_savecontrol(inp, n, &opts);
183 if ((inp->inp_vflag & INP_IPV6) && (inp->inp_flags2 & INP_ORIGDSTADDR)) {
184 tmp_opts = sbcreatecontrol((caddr_t)&fromsa[1],
185 sizeof(struct sockaddr_in6), IPV6_ORIGDSTADDR, IPPROTO_IPV6);
186 if (tmp_opts) {
187 if (opts) {
188 tmp_opts->m_next = opts;
189 opts = tmp_opts;
190 } else
191 opts = tmp_opts;
192 }
193 }
194 m_adj(n, off + sizeof(struct udphdr));
195
196 so = inp->inp_socket;
197 SOCKBUF_LOCK(&so->so_rcv);
198 if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)&fromsa[0], n,
199 opts) == 0) {
200 soroverflow_locked(so);
201 m_freem(n);
202 if (opts)
203 m_freem(opts);
204 UDPSTAT_INC(udps_fullsock);
205 } else
206 sorwakeup_locked(so);
207 return (0);
208 }
209
210 int
211 udp6_input(struct mbuf **mp, int *offp, int proto)
212 {
213 struct mbuf *m = *mp;
214 struct ifnet *ifp;
215 struct ip6_hdr *ip6;
216 struct udphdr *uh;
217 struct inpcb *inp;
218 struct inpcbinfo *pcbinfo;
219 struct udpcb *up;
220 int off = *offp;
221 int cscov_partial;
222 int plen, ulen;
223 struct sockaddr_in6 fromsa[2];
224 struct m_tag *fwd_tag;
225 uint16_t uh_sum;
226 uint8_t nxt;
227
228 NET_EPOCH_ASSERT();
229
230 ifp = m->m_pkthdr.rcvif;
231
232 if (m->m_len < off + sizeof(struct udphdr)) {
233 m = m_pullup(m, off + sizeof(struct udphdr));
234 if (m == NULL) {
235 IP6STAT_INC(ip6s_exthdrtoolong);
236 *mp = NULL;
237 return (IPPROTO_DONE);
238 }
239 }
240 ip6 = mtod(m, struct ip6_hdr *);
241 uh = (struct udphdr *)((caddr_t)ip6 + off);
242
243 UDPSTAT_INC(udps_ipackets);
244
245 /*
246 * Destination port of 0 is illegal, based on RFC768.
247 */
248 if (uh->uh_dport == 0)
249 goto badunlocked;
250
251 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
252 ulen = ntohs((u_short)uh->uh_ulen);
253
254 nxt = proto;
255 cscov_partial = (nxt == IPPROTO_UDPLITE) ? 1 : 0;
256 if (nxt == IPPROTO_UDPLITE) {
257 /* Zero means checksum over the complete packet. */
258 if (ulen == 0)
259 ulen = plen;
260 if (ulen == plen)
261 cscov_partial = 0;
262 if ((ulen < sizeof(struct udphdr)) || (ulen > plen)) {
263 /* XXX: What is the right UDPLite MIB counter? */
264 goto badunlocked;
265 }
266 if (uh->uh_sum == 0) {
267 /* XXX: What is the right UDPLite MIB counter? */
268 goto badunlocked;
269 }
270 } else {
271 if ((ulen < sizeof(struct udphdr)) || (plen != ulen)) {
272 UDPSTAT_INC(udps_badlen);
273 goto badunlocked;
274 }
275 if (uh->uh_sum == 0) {
276 UDPSTAT_INC(udps_nosum);
277 /*
278 * dport 0 was rejected earlier so this is OK even if
279 * zero_checksum_port is 0 (which is its default value).
280 */
281 if (ntohs(uh->uh_dport) == V_zero_checksum_port)
282 goto skip_checksum;
283 else
284 goto badunlocked;
285 }
286 }
287
288 if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID_IPV6) &&
289 !cscov_partial) {
290 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
291 uh_sum = m->m_pkthdr.csum_data;
292 else
293 uh_sum = in6_cksum_pseudo(ip6, ulen, nxt,
294 m->m_pkthdr.csum_data);
295 uh_sum ^= 0xffff;
296 } else
297 uh_sum = in6_cksum_partial(m, nxt, off, plen, ulen);
298
299 if (uh_sum != 0) {
300 UDPSTAT_INC(udps_badsum);
301 goto badunlocked;
302 }
303
304 skip_checksum:
305 /*
306 * Construct sockaddr format source address.
307 */
308 init_sin6(&fromsa[0], m, 0);
309 fromsa[0].sin6_port = uh->uh_sport;
310 init_sin6(&fromsa[1], m, 1);
311 fromsa[1].sin6_port = uh->uh_dport;
312
313 pcbinfo = udp_get_inpcbinfo(nxt);
314 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
315 struct inpcb *last;
316 struct inpcbhead *pcblist;
317 struct ip6_moptions *imo;
318
319 /*
320 * In the event that laddr should be set to the link-local
321 * address (this happens in RIPng), the multicast address
322 * specified in the received packet will not match laddr. To
323 * handle this situation, matching is relaxed if the
324 * receiving interface is the same as one specified in the
325 * socket and if the destination multicast address matches
326 * one of the multicast groups specified in the socket.
327 */
328
329 /*
330 * KAME note: traditionally we dropped udpiphdr from mbuf
331 * here. We need udphdr for IPsec processing so we do that
332 * later.
333 */
334 pcblist = udp_get_pcblist(nxt);
335 last = NULL;
336 CK_LIST_FOREACH(inp, pcblist, inp_list) {
337 if ((inp->inp_vflag & INP_IPV6) == 0)
338 continue;
339 if (inp->inp_lport != uh->uh_dport)
340 continue;
341 if (inp->inp_fport != 0 &&
342 inp->inp_fport != uh->uh_sport)
343 continue;
344 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
345 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
346 &ip6->ip6_dst))
347 continue;
348 }
349 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
350 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
351 &ip6->ip6_src) ||
352 inp->inp_fport != uh->uh_sport)
353 continue;
354 }
355
356 INP_RLOCK(inp);
357
358 if (__predict_false(inp->inp_flags2 & INP_FREED)) {
359 INP_RUNLOCK(inp);
360 continue;
361 }
362
363 /*
364 * XXXRW: Because we weren't holding either the inpcb
365 * or the hash lock when we checked for a match
366 * before, we should probably recheck now that the
367 * inpcb lock is (supposed to be) held.
368 */
369
370 /*
371 * Handle socket delivery policy for any-source
372 * and source-specific multicast. [RFC3678]
373 */
374 imo = inp->in6p_moptions;
375 if (imo != NULL) {
376 struct sockaddr_in6 mcaddr;
377 int blocked;
378
379 bzero(&mcaddr, sizeof(struct sockaddr_in6));
380 mcaddr.sin6_len = sizeof(struct sockaddr_in6);
381 mcaddr.sin6_family = AF_INET6;
382 mcaddr.sin6_addr = ip6->ip6_dst;
383
384 blocked = im6o_mc_filter(imo, ifp,
385 (struct sockaddr *)&mcaddr,
386 (struct sockaddr *)&fromsa[0]);
387 if (blocked != MCAST_PASS) {
388 if (blocked == MCAST_NOTGMEMBER)
389 IP6STAT_INC(ip6s_notmember);
390 if (blocked == MCAST_NOTSMEMBER ||
391 blocked == MCAST_MUTED)
392 UDPSTAT_INC(udps_filtermcast);
393 INP_RUNLOCK(inp);
394 continue;
395 }
396 }
397
398 if (last != NULL) {
399 struct mbuf *n;
400
401 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) !=
402 NULL) {
403 if (nxt == IPPROTO_UDPLITE)
404 UDPLITE_PROBE(receive, NULL,
405 last, ip6, last, uh);
406 else
407 UDP_PROBE(receive, NULL, last,
408 ip6, last, uh);
409 if (udp6_append(last, n, off,
410 fromsa)) {
411 INP_RUNLOCK(inp);
412 goto badunlocked;
413 }
414 }
415 /* Release PCB lock taken on previous pass. */
416 INP_RUNLOCK(last);
417 }
418 last = inp;
419 /*
420 * Don't look for additional matches if this one does
421 * not have either the SO_REUSEPORT or SO_REUSEADDR
422 * socket options set. This heuristic avoids
423 * searching through all pcbs in the common case of a
424 * non-shared port. It assumes that an application
425 * will never clear these options after setting them.
426 */
427 if ((last->inp_socket->so_options &
428 (SO_REUSEPORT|SO_REUSEPORT_LB|SO_REUSEADDR)) == 0)
429 break;
430 }
431
432 if (last == NULL) {
433 /*
434 * No matching pcb found; discard datagram. (No need
435 * to send an ICMP Port Unreachable for a broadcast
436 * or multicast datgram.)
437 */
438 UDPSTAT_INC(udps_noport);
439 UDPSTAT_INC(udps_noportmcast);
440 goto badunlocked;
441 }
442
443 if (nxt == IPPROTO_UDPLITE)
444 UDPLITE_PROBE(receive, NULL, last, ip6, last, uh);
445 else
446 UDP_PROBE(receive, NULL, last, ip6, last, uh);
447 if (udp6_append(last, m, off, fromsa) == 0)
448 INP_RUNLOCK(last);
449 *mp = NULL;
450 return (IPPROTO_DONE);
451 }
452 /*
453 * Locate pcb for datagram.
454 */
455
456 /*
457 * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
458 */
459 if ((m->m_flags & M_IP6_NEXTHOP) &&
460 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
461 struct sockaddr_in6 *next_hop6;
462
463 next_hop6 = (struct sockaddr_in6 *)(fwd_tag + 1);
464
465 /*
466 * Transparently forwarded. Pretend to be the destination.
467 * Already got one like this?
468 */
469 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src,
470 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
471 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif, m);
472 if (!inp) {
473 /*
474 * It's new. Try to find the ambushing socket.
475 * Because we've rewritten the destination address,
476 * any hardware-generated hash is ignored.
477 */
478 inp = in6_pcblookup(pcbinfo, &ip6->ip6_src,
479 uh->uh_sport, &next_hop6->sin6_addr,
480 next_hop6->sin6_port ? htons(next_hop6->sin6_port) :
481 uh->uh_dport, INPLOOKUP_WILDCARD |
482 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif);
483 }
484 /* Remove the tag from the packet. We don't need it anymore. */
485 m_tag_delete(m, fwd_tag);
486 m->m_flags &= ~M_IP6_NEXTHOP;
487 } else
488 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src,
489 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
490 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB,
491 m->m_pkthdr.rcvif, m);
492 if (inp == NULL) {
493 if (V_udp_log_in_vain) {
494 char ip6bufs[INET6_ADDRSTRLEN];
495 char ip6bufd[INET6_ADDRSTRLEN];
496
497 log(LOG_INFO,
498 "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
499 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
500 ntohs(uh->uh_dport),
501 ip6_sprintf(ip6bufs, &ip6->ip6_src),
502 ntohs(uh->uh_sport));
503 }
504 if (nxt == IPPROTO_UDPLITE)
505 UDPLITE_PROBE(receive, NULL, NULL, ip6, NULL, uh);
506 else
507 UDP_PROBE(receive, NULL, NULL, ip6, NULL, uh);
508 UDPSTAT_INC(udps_noport);
509 if (m->m_flags & M_MCAST) {
510 printf("UDP6: M_MCAST is set in a unicast packet.\n");
511 UDPSTAT_INC(udps_noportmcast);
512 goto badunlocked;
513 }
514 if (V_udp_blackhole)
515 goto badunlocked;
516 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
517 *mp = NULL;
518 return (IPPROTO_DONE);
519 }
520 INP_RLOCK_ASSERT(inp);
521 up = intoudpcb(inp);
522 if (cscov_partial) {
523 if (up->u_rxcslen == 0 || up->u_rxcslen > ulen) {
524 INP_RUNLOCK(inp);
525 m_freem(m);
526 *mp = NULL;
527 return (IPPROTO_DONE);
528 }
529 }
530 if (nxt == IPPROTO_UDPLITE)
531 UDPLITE_PROBE(receive, NULL, inp, ip6, inp, uh);
532 else
533 UDP_PROBE(receive, NULL, inp, ip6, inp, uh);
534 if (udp6_append(inp, m, off, fromsa) == 0)
535 INP_RUNLOCK(inp);
536 *mp = NULL;
537 return (IPPROTO_DONE);
538
539 badunlocked:
540 m_freem(m);
541 *mp = NULL;
542 return (IPPROTO_DONE);
543 }
544
545 static void
546 udp6_common_ctlinput(int cmd, struct sockaddr *sa, void *d,
547 struct inpcbinfo *pcbinfo)
548 {
549 struct udphdr uh;
550 struct ip6_hdr *ip6;
551 struct mbuf *m;
552 int off = 0;
553 struct ip6ctlparam *ip6cp = NULL;
554 const struct sockaddr_in6 *sa6_src = NULL;
555 void *cmdarg;
556 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify;
557 struct udp_portonly {
558 u_int16_t uh_sport;
559 u_int16_t uh_dport;
560 } *uhp;
561
562 if (sa->sa_family != AF_INET6 ||
563 sa->sa_len != sizeof(struct sockaddr_in6))
564 return;
565
566 if ((unsigned)cmd >= PRC_NCMDS)
567 return;
568 if (PRC_IS_REDIRECT(cmd))
569 notify = in6_rtchange, d = NULL;
570 else if (cmd == PRC_HOSTDEAD)
571 d = NULL;
572 else if (inet6ctlerrmap[cmd] == 0)
573 return;
574
575 /* if the parameter is from icmp6, decode it. */
576 if (d != NULL) {
577 ip6cp = (struct ip6ctlparam *)d;
578 m = ip6cp->ip6c_m;
579 ip6 = ip6cp->ip6c_ip6;
580 off = ip6cp->ip6c_off;
581 cmdarg = ip6cp->ip6c_cmdarg;
582 sa6_src = ip6cp->ip6c_src;
583 } else {
584 m = NULL;
585 ip6 = NULL;
586 cmdarg = NULL;
587 sa6_src = &sa6_any;
588 }
589
590 if (ip6) {
591 /*
592 * XXX: We assume that when IPV6 is non NULL,
593 * M and OFF are valid.
594 */
595
596 /* Check if we can safely examine src and dst ports. */
597 if (m->m_pkthdr.len < off + sizeof(*uhp))
598 return;
599
600 bzero(&uh, sizeof(uh));
601 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
602
603 if (!PRC_IS_REDIRECT(cmd)) {
604 /* Check to see if its tunneled */
605 struct inpcb *inp;
606 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_dst,
607 uh.uh_dport, &ip6->ip6_src, uh.uh_sport,
608 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB,
609 m->m_pkthdr.rcvif, m);
610 if (inp != NULL) {
611 struct udpcb *up;
612
613 up = intoudpcb(inp);
614 if (up->u_icmp_func) {
615 /* Yes it is. */
616 INP_RUNLOCK(inp);
617 (*up->u_icmp_func)(cmd, (struct sockaddr *)ip6cp->ip6c_src,
618 d, up->u_tun_ctx);
619 return;
620 } else {
621 /* Can't find it. */
622 INP_RUNLOCK(inp);
623 }
624 }
625 }
626 (void)in6_pcbnotify(pcbinfo, sa, uh.uh_dport,
627 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd,
628 cmdarg, notify);
629 } else
630 (void)in6_pcbnotify(pcbinfo, sa, 0,
631 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
632 }
633
634 void
635 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
636 {
637
638 return (udp6_common_ctlinput(cmd, sa, d, &V_udbinfo));
639 }
640
641 void
642 udplite6_ctlinput(int cmd, struct sockaddr *sa, void *d)
643 {
644
645 return (udp6_common_ctlinput(cmd, sa, d, &V_ulitecbinfo));
646 }
647
648 static int
649 udp6_getcred(SYSCTL_HANDLER_ARGS)
650 {
651 struct xucred xuc;
652 struct sockaddr_in6 addrs[2];
653 struct epoch_tracker et;
654 struct inpcb *inp;
655 int error;
656
657 error = priv_check(req->td, PRIV_NETINET_GETCRED);
658 if (error)
659 return (error);
660
661 if (req->newlen != sizeof(addrs))
662 return (EINVAL);
663 if (req->oldlen != sizeof(struct xucred))
664 return (EINVAL);
665 error = SYSCTL_IN(req, addrs, sizeof(addrs));
666 if (error)
667 return (error);
668 if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 ||
669 (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) {
670 return (error);
671 }
672 NET_EPOCH_ENTER(et);
673 inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr,
674 addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port,
675 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
676 NET_EPOCH_EXIT(et);
677 if (inp != NULL) {
678 INP_RLOCK_ASSERT(inp);
679 if (inp->inp_socket == NULL)
680 error = ENOENT;
681 if (error == 0)
682 error = cr_canseesocket(req->td->td_ucred,
683 inp->inp_socket);
684 if (error == 0)
685 cru2x(inp->inp_cred, &xuc);
686 INP_RUNLOCK(inp);
687 } else
688 error = ENOENT;
689 if (error == 0)
690 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
691 return (error);
692 }
693
694 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred,
695 CTLTYPE_OPAQUE | CTLFLAG_RW | CTLFLAG_MPSAFE,
696 0, 0, udp6_getcred, "S,xucred",
697 "Get the xucred of a UDP6 connection");
698
699 static int
700 udp6_output(struct socket *so, int flags_arg, struct mbuf *m,
701 struct sockaddr *addr6, struct mbuf *control, struct thread *td)
702 {
703 struct inpcb *inp;
704 struct ip6_hdr *ip6;
705 struct udphdr *udp6;
706 struct in6_addr *laddr, *faddr, in6a;
707 struct ip6_pktopts *optp, opt;
708 struct sockaddr_in6 *sin6, tmp;
709 struct epoch_tracker et;
710 int cscov_partial, error, flags, hlen, scope_ambiguous;
711 u_int32_t ulen, plen;
712 uint16_t cscov;
713 u_short fport;
714 uint8_t nxt;
715
716 /* addr6 has been validated in udp6_send(). */
717 sin6 = (struct sockaddr_in6 *)addr6;
718
719 /*
720 * In contrast to to IPv4 we do not validate the max. packet length
721 * here due to IPv6 Jumbograms (RFC2675).
722 */
723
724 scope_ambiguous = 0;
725 if (sin6) {
726 /* Protect *addr6 from overwrites. */
727 tmp = *sin6;
728 sin6 = &tmp;
729
730 /*
731 * Application should provide a proper zone ID or the use of
732 * default zone IDs should be enabled. Unfortunately, some
733 * applications do not behave as it should, so we need a
734 * workaround. Even if an appropriate ID is not determined,
735 * we'll see if we can determine the outgoing interface. If we
736 * can, determine the zone ID based on the interface below.
737 */
738 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone)
739 scope_ambiguous = 1;
740 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0) {
741 if (control)
742 m_freem(control);
743 m_freem(m);
744 return (error);
745 }
746 }
747
748 inp = sotoinpcb(so);
749 KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
750 /*
751 * In the following cases we want a write lock on the inp for either
752 * local operations or for possible route cache updates in the IPv6
753 * output path:
754 * - on connected sockets (sin6 is NULL) for route cache updates,
755 * - when we are not bound to an address and source port (it is
756 * in6_pcbsetport() which will require the write lock).
757 *
758 * We check the inp fields before actually locking the inp, so
759 * here exists a race, and we may WLOCK the inp and end with already
760 * bound one by other thread. This is fine.
761 */
762 if (sin6 == NULL || (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
763 inp->inp_lport == 0))
764 INP_WLOCK(inp);
765 else
766 INP_RLOCK(inp);
767
768 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
769 IPPROTO_UDP : IPPROTO_UDPLITE;
770
771 #ifdef INET
772 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
773 int hasv4addr;
774
775 if (sin6 == NULL)
776 hasv4addr = (inp->inp_vflag & INP_IPV4);
777 else
778 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
779 ? 1 : 0;
780 if (hasv4addr) {
781 struct pr_usrreqs *pru;
782
783 /*
784 * XXXRW: We release UDP-layer locks before calling
785 * udp_send() in order to avoid recursion. However,
786 * this does mean there is a short window where inp's
787 * fields are unstable. Could this lead to a
788 * potential race in which the factors causing us to
789 * select the UDPv4 output routine are invalidated?
790 */
791 INP_UNLOCK(inp);
792 if (sin6)
793 in6_sin6_2_sin_in_sock((struct sockaddr *)sin6);
794 pru = inetsw[ip_protox[nxt]].pr_usrreqs;
795 /* addr will just be freed in sendit(). */
796 return ((*pru->pru_send)(so, flags_arg | PRUS_IPV6, m,
797 (struct sockaddr *)sin6, control, td));
798 }
799 } else
800 #endif
801 if (sin6 && IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
802 /*
803 * Given this is either an IPv6-only socket or no INET is
804 * supported we will fail the send if the given destination
805 * address is a v4mapped address.
806 *
807 * XXXGL: do we leak m and control?
808 */
809 INP_UNLOCK(inp);
810 return (EINVAL);
811 }
812
813 if (control) {
814 if ((error = ip6_setpktopts(control, &opt,
815 inp->in6p_outputopts, td->td_ucred, nxt)) != 0) {
816 INP_UNLOCK(inp);
817 ip6_clearpktopts(&opt, -1);
818 if (control)
819 m_freem(control);
820 m_freem(m);
821 return (error);
822 }
823 optp = &opt;
824 } else
825 optp = inp->in6p_outputopts;
826
827 NET_EPOCH_ENTER(et);
828 if (sin6) {
829 /*
830 * Since we saw no essential reason for calling in_pcbconnect,
831 * we get rid of such kind of logic, and call in6_selectsrc
832 * and in6_pcbsetport in order to fill in the local address
833 * and the local port.
834 */
835 if (sin6->sin6_port == 0) {
836 error = EADDRNOTAVAIL;
837 goto release;
838 }
839
840 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
841 /* how about ::ffff:0.0.0.0 case? */
842 error = EISCONN;
843 goto release;
844 }
845
846 /*
847 * Given we handle the v4mapped case in the INET block above
848 * assert here that it must not happen anymore.
849 */
850 KASSERT(!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr),
851 ("%s: sin6(%p)->sin6_addr is v4mapped which we "
852 "should have handled.", __func__, sin6));
853
854 /* This only requires read-locking. */
855 error = in6_selectsrc_socket(sin6, optp, inp,
856 td->td_ucred, scope_ambiguous, &in6a, NULL);
857 if (error)
858 goto release;
859 laddr = &in6a;
860
861 if (inp->inp_lport == 0) {
862 struct inpcbinfo *pcbinfo;
863
864 INP_WLOCK_ASSERT(inp);
865
866 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
867 INP_HASH_WLOCK(pcbinfo);
868 error = in6_pcbsetport(laddr, inp, td->td_ucred);
869 INP_HASH_WUNLOCK(pcbinfo);
870 if (error != 0) {
871 /* Undo an address bind that may have occurred. */
872 inp->in6p_laddr = in6addr_any;
873 goto release;
874 }
875 }
876 faddr = &sin6->sin6_addr;
877 fport = sin6->sin6_port; /* allow 0 port */
878
879 } else {
880 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
881 error = ENOTCONN;
882 goto release;
883 }
884 laddr = &inp->in6p_laddr;
885 faddr = &inp->in6p_faddr;
886 fport = inp->inp_fport;
887 }
888
889 ulen = m->m_pkthdr.len;
890 plen = sizeof(struct udphdr) + ulen;
891 hlen = sizeof(struct ip6_hdr);
892
893 /*
894 * Calculate data length and get a mbuf
895 * for UDP and IP6 headers.
896 */
897 M_PREPEND(m, hlen + sizeof(struct udphdr), M_NOWAIT);
898 if (m == NULL) {
899 error = ENOBUFS;
900 goto release;
901 }
902
903 /*
904 * Stuff checksum and output datagram.
905 */
906 cscov = cscov_partial = 0;
907 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
908 udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */
909 udp6->uh_dport = fport;
910 if (nxt == IPPROTO_UDPLITE) {
911 struct udpcb *up;
912
913 up = intoudpcb(inp);
914 cscov = up->u_txcslen;
915 if (cscov >= plen)
916 cscov = 0;
917 udp6->uh_ulen = htons(cscov);
918 /*
919 * For UDP-Lite, checksum coverage length of zero means
920 * the entire UDPLite packet is covered by the checksum.
921 */
922 cscov_partial = (cscov == 0) ? 0 : 1;
923 } else if (plen <= 0xffff)
924 udp6->uh_ulen = htons((u_short)plen);
925 else
926 udp6->uh_ulen = 0;
927 udp6->uh_sum = 0;
928
929 ip6 = mtod(m, struct ip6_hdr *);
930 ip6->ip6_flow = inp->inp_flow & IPV6_FLOWINFO_MASK;
931 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
932 ip6->ip6_vfc |= IPV6_VERSION;
933 ip6->ip6_plen = htons((u_short)plen);
934 ip6->ip6_nxt = nxt;
935 ip6->ip6_hlim = in6_selecthlim(inp, NULL);
936 ip6->ip6_src = *laddr;
937 ip6->ip6_dst = *faddr;
938
939 #ifdef MAC
940 mac_inpcb_create_mbuf(inp, m);
941 #endif
942
943 if (cscov_partial) {
944 if ((udp6->uh_sum = in6_cksum_partial(m, nxt,
945 sizeof(struct ip6_hdr), plen, cscov)) == 0)
946 udp6->uh_sum = 0xffff;
947 } else {
948 udp6->uh_sum = in6_cksum_pseudo(ip6, plen, nxt, 0);
949 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6;
950 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
951 }
952
953 flags = 0;
954 #if defined(ROUTE_MPATH) || defined(RSS)
955 if (CALC_FLOWID_OUTBOUND_SENDTO) {
956 uint32_t hash_type, hash_val;
957 uint8_t pr;
958
959 pr = inp->inp_socket->so_proto->pr_protocol;
960
961 hash_val = fib6_calc_packet_hash(laddr, faddr,
962 inp->inp_lport, fport, pr, &hash_type);
963 m->m_pkthdr.flowid = hash_val;
964 M_HASHTYPE_SET(m, hash_type);
965 }
966 /* do not use inp flowid */
967 flags |= IP_NODEFAULTFLOWID;
968 #endif
969
970 UDPSTAT_INC(udps_opackets);
971 if (nxt == IPPROTO_UDPLITE)
972 UDPLITE_PROBE(send, NULL, inp, ip6, inp, udp6);
973 else
974 UDP_PROBE(send, NULL, inp, ip6, inp, udp6);
975 error = ip6_output(m, optp,
976 INP_WLOCKED(inp) ? &inp->inp_route6 : NULL, flags,
977 inp->in6p_moptions, NULL, inp);
978 INP_UNLOCK(inp);
979 NET_EPOCH_EXIT(et);
980
981 if (control) {
982 ip6_clearpktopts(&opt, -1);
983 m_freem(control);
984 }
985 return (error);
986
987 release:
988 INP_UNLOCK(inp);
989 NET_EPOCH_EXIT(et);
990 if (control) {
991 ip6_clearpktopts(&opt, -1);
992 m_freem(control);
993 }
994 m_freem(m);
995
996 return (error);
997 }
998
999 static void
1000 udp6_abort(struct socket *so)
1001 {
1002 struct inpcb *inp;
1003 struct inpcbinfo *pcbinfo;
1004
1005 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1006 inp = sotoinpcb(so);
1007 KASSERT(inp != NULL, ("udp6_abort: inp == NULL"));
1008
1009 INP_WLOCK(inp);
1010 #ifdef INET
1011 if (inp->inp_vflag & INP_IPV4) {
1012 struct pr_usrreqs *pru;
1013 uint8_t nxt;
1014
1015 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
1016 IPPROTO_UDP : IPPROTO_UDPLITE;
1017 INP_WUNLOCK(inp);
1018 pru = inetsw[ip_protox[nxt]].pr_usrreqs;
1019 (*pru->pru_abort)(so);
1020 return;
1021 }
1022 #endif
1023
1024 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1025 INP_HASH_WLOCK(pcbinfo);
1026 in6_pcbdisconnect(inp);
1027 inp->in6p_laddr = in6addr_any;
1028 INP_HASH_WUNLOCK(pcbinfo);
1029 soisdisconnected(so);
1030 }
1031 INP_WUNLOCK(inp);
1032 }
1033
1034 static int
1035 udp6_attach(struct socket *so, int proto, struct thread *td)
1036 {
1037 struct inpcb *inp;
1038 struct inpcbinfo *pcbinfo;
1039 int error;
1040
1041 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1042 inp = sotoinpcb(so);
1043 KASSERT(inp == NULL, ("udp6_attach: inp != NULL"));
1044
1045 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1046 error = soreserve(so, udp_sendspace, udp_recvspace);
1047 if (error)
1048 return (error);
1049 }
1050 INP_INFO_WLOCK(pcbinfo);
1051 error = in_pcballoc(so, pcbinfo);
1052 if (error) {
1053 INP_INFO_WUNLOCK(pcbinfo);
1054 return (error);
1055 }
1056 inp = (struct inpcb *)so->so_pcb;
1057 inp->inp_vflag |= INP_IPV6;
1058 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
1059 inp->inp_vflag |= INP_IPV4;
1060 inp->in6p_hops = -1; /* use kernel default */
1061 inp->in6p_cksum = -1; /* just to be sure */
1062 /*
1063 * XXX: ugly!!
1064 * IPv4 TTL initialization is necessary for an IPv6 socket as well,
1065 * because the socket may be bound to an IPv6 wildcard address,
1066 * which may match an IPv4-mapped IPv6 address.
1067 */
1068 inp->inp_ip_ttl = V_ip_defttl;
1069
1070 error = udp_newudpcb(inp);
1071 if (error) {
1072 in_pcbdetach(inp);
1073 in_pcbfree(inp);
1074 INP_INFO_WUNLOCK(pcbinfo);
1075 return (error);
1076 }
1077 INP_WUNLOCK(inp);
1078 INP_INFO_WUNLOCK(pcbinfo);
1079 return (0);
1080 }
1081
1082 static int
1083 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
1084 {
1085 struct inpcb *inp;
1086 struct inpcbinfo *pcbinfo;
1087 int error;
1088 u_char vflagsav;
1089
1090 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1091 inp = sotoinpcb(so);
1092 KASSERT(inp != NULL, ("udp6_bind: inp == NULL"));
1093
1094 if (nam->sa_family != AF_INET6)
1095 return (EAFNOSUPPORT);
1096 if (nam->sa_len != sizeof(struct sockaddr_in6))
1097 return (EINVAL);
1098
1099 INP_WLOCK(inp);
1100 INP_HASH_WLOCK(pcbinfo);
1101 vflagsav = inp->inp_vflag;
1102 inp->inp_vflag &= ~INP_IPV4;
1103 inp->inp_vflag |= INP_IPV6;
1104 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
1105 struct sockaddr_in6 *sin6_p;
1106
1107 sin6_p = (struct sockaddr_in6 *)nam;
1108
1109 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
1110 inp->inp_vflag |= INP_IPV4;
1111 #ifdef INET
1112 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
1113 struct sockaddr_in sin;
1114
1115 in6_sin6_2_sin(&sin, sin6_p);
1116 inp->inp_vflag |= INP_IPV4;
1117 inp->inp_vflag &= ~INP_IPV6;
1118 error = in_pcbbind(inp, (struct sockaddr *)&sin,
1119 td->td_ucred);
1120 goto out;
1121 }
1122 #endif
1123 }
1124
1125 error = in6_pcbbind(inp, nam, td->td_ucred);
1126 #ifdef INET
1127 out:
1128 #endif
1129 if (error != 0)
1130 inp->inp_vflag = vflagsav;
1131 INP_HASH_WUNLOCK(pcbinfo);
1132 INP_WUNLOCK(inp);
1133 return (error);
1134 }
1135
1136 static void
1137 udp6_close(struct socket *so)
1138 {
1139 struct inpcb *inp;
1140 struct inpcbinfo *pcbinfo;
1141
1142 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1143 inp = sotoinpcb(so);
1144 KASSERT(inp != NULL, ("udp6_close: inp == NULL"));
1145
1146 INP_WLOCK(inp);
1147 #ifdef INET
1148 if (inp->inp_vflag & INP_IPV4) {
1149 struct pr_usrreqs *pru;
1150 uint8_t nxt;
1151
1152 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
1153 IPPROTO_UDP : IPPROTO_UDPLITE;
1154 INP_WUNLOCK(inp);
1155 pru = inetsw[ip_protox[nxt]].pr_usrreqs;
1156 (*pru->pru_disconnect)(so);
1157 return;
1158 }
1159 #endif
1160 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1161 INP_HASH_WLOCK(pcbinfo);
1162 in6_pcbdisconnect(inp);
1163 inp->in6p_laddr = in6addr_any;
1164 INP_HASH_WUNLOCK(pcbinfo);
1165 soisdisconnected(so);
1166 }
1167 INP_WUNLOCK(inp);
1168 }
1169
1170 static int
1171 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1172 {
1173 #ifdef INET
1174 struct epoch_tracker et;
1175 #endif
1176 struct inpcb *inp;
1177 struct inpcbinfo *pcbinfo;
1178 struct sockaddr_in6 *sin6;
1179 int error;
1180 u_char vflagsav;
1181
1182 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1183 inp = sotoinpcb(so);
1184 KASSERT(inp != NULL, ("udp6_connect: inp == NULL"));
1185
1186 sin6 = (struct sockaddr_in6 *)nam;
1187 if (sin6->sin6_family != AF_INET6)
1188 return (EAFNOSUPPORT);
1189 if (sin6->sin6_len != sizeof(*sin6))
1190 return (EINVAL);
1191
1192 /*
1193 * XXXRW: Need to clarify locking of v4/v6 flags.
1194 */
1195 INP_WLOCK(inp);
1196 #ifdef INET
1197 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
1198 struct sockaddr_in sin;
1199
1200 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
1201 error = EINVAL;
1202 goto out;
1203 }
1204 if ((inp->inp_vflag & INP_IPV4) == 0) {
1205 error = EAFNOSUPPORT;
1206 goto out;
1207 }
1208 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1209 error = EISCONN;
1210 goto out;
1211 }
1212 in6_sin6_2_sin(&sin, sin6);
1213 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr);
1214 if (error != 0)
1215 goto out;
1216 vflagsav = inp->inp_vflag;
1217 inp->inp_vflag |= INP_IPV4;
1218 inp->inp_vflag &= ~INP_IPV6;
1219 NET_EPOCH_ENTER(et);
1220 INP_HASH_WLOCK(pcbinfo);
1221 error = in_pcbconnect(inp, (struct sockaddr *)&sin,
1222 td->td_ucred);
1223 INP_HASH_WUNLOCK(pcbinfo);
1224 NET_EPOCH_EXIT(et);
1225 /*
1226 * If connect succeeds, mark socket as connected. If
1227 * connect fails and socket is unbound, reset inp_vflag
1228 * field.
1229 */
1230 if (error == 0)
1231 soisconnected(so);
1232 else if (inp->inp_laddr.s_addr == INADDR_ANY &&
1233 inp->inp_lport == 0)
1234 inp->inp_vflag = vflagsav;
1235 goto out;
1236 } else {
1237 if ((inp->inp_vflag & INP_IPV6) == 0) {
1238 error = EAFNOSUPPORT;
1239 goto out;
1240 }
1241 }
1242 #endif
1243 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1244 error = EISCONN;
1245 goto out;
1246 }
1247 error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr);
1248 if (error != 0)
1249 goto out;
1250 vflagsav = inp->inp_vflag;
1251 inp->inp_vflag &= ~INP_IPV4;
1252 inp->inp_vflag |= INP_IPV6;
1253 INP_HASH_WLOCK(pcbinfo);
1254 error = in6_pcbconnect(inp, nam, td->td_ucred);
1255 INP_HASH_WUNLOCK(pcbinfo);
1256 /*
1257 * If connect succeeds, mark socket as connected. If
1258 * connect fails and socket is unbound, reset inp_vflag
1259 * field.
1260 */
1261 if (error == 0)
1262 soisconnected(so);
1263 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
1264 inp->inp_lport == 0)
1265 inp->inp_vflag = vflagsav;
1266 out:
1267 INP_WUNLOCK(inp);
1268 return (error);
1269 }
1270
1271 static void
1272 udp6_detach(struct socket *so)
1273 {
1274 struct inpcb *inp;
1275 struct inpcbinfo *pcbinfo;
1276 struct udpcb *up;
1277
1278 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1279 inp = sotoinpcb(so);
1280 KASSERT(inp != NULL, ("udp6_detach: inp == NULL"));
1281
1282 INP_INFO_WLOCK(pcbinfo);
1283 INP_WLOCK(inp);
1284 up = intoudpcb(inp);
1285 KASSERT(up != NULL, ("%s: up == NULL", __func__));
1286 in_pcbdetach(inp);
1287 in_pcbfree(inp);
1288 INP_INFO_WUNLOCK(pcbinfo);
1289 udp_discardcb(up);
1290 }
1291
1292 static int
1293 udp6_disconnect(struct socket *so)
1294 {
1295 struct inpcb *inp;
1296 struct inpcbinfo *pcbinfo;
1297
1298 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1299 inp = sotoinpcb(so);
1300 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL"));
1301
1302 INP_WLOCK(inp);
1303 #ifdef INET
1304 if (inp->inp_vflag & INP_IPV4) {
1305 struct pr_usrreqs *pru;
1306 uint8_t nxt;
1307
1308 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
1309 IPPROTO_UDP : IPPROTO_UDPLITE;
1310 INP_WUNLOCK(inp);
1311 pru = inetsw[ip_protox[nxt]].pr_usrreqs;
1312 (void)(*pru->pru_disconnect)(so);
1313 return (0);
1314 }
1315 #endif
1316
1317 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1318 INP_WUNLOCK(inp);
1319 return (ENOTCONN);
1320 }
1321
1322 INP_HASH_WLOCK(pcbinfo);
1323 in6_pcbdisconnect(inp);
1324 inp->in6p_laddr = in6addr_any;
1325 INP_HASH_WUNLOCK(pcbinfo);
1326 SOCK_LOCK(so);
1327 so->so_state &= ~SS_ISCONNECTED; /* XXX */
1328 SOCK_UNLOCK(so);
1329 INP_WUNLOCK(inp);
1330 return (0);
1331 }
1332
1333 static int
1334 udp6_send(struct socket *so, int flags, struct mbuf *m,
1335 struct sockaddr *addr, struct mbuf *control, struct thread *td)
1336 {
1337 int error;
1338
1339 if (addr) {
1340 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
1341 error = EINVAL;
1342 goto bad;
1343 }
1344 if (addr->sa_family != AF_INET6) {
1345 error = EAFNOSUPPORT;
1346 goto bad;
1347 }
1348 }
1349
1350 return (udp6_output(so, flags, m, addr, control, td));
1351
1352 bad:
1353 if (control)
1354 m_freem(control);
1355 m_freem(m);
1356 return (error);
1357 }
1358
1359 struct pr_usrreqs udp6_usrreqs = {
1360 .pru_abort = udp6_abort,
1361 .pru_attach = udp6_attach,
1362 .pru_bind = udp6_bind,
1363 .pru_connect = udp6_connect,
1364 .pru_control = in6_control,
1365 .pru_detach = udp6_detach,
1366 .pru_disconnect = udp6_disconnect,
1367 .pru_peeraddr = in6_mapped_peeraddr,
1368 .pru_send = udp6_send,
1369 .pru_shutdown = udp_shutdown,
1370 .pru_sockaddr = in6_mapped_sockaddr,
1371 .pru_soreceive = soreceive_dgram,
1372 .pru_sosend = sosend_dgram,
1373 .pru_sosetlabel = in_pcbsosetlabel,
1374 .pru_close = udp6_close
1375 };
Cache object: 2a16b9f9508c3baf699e98ae94e11b91
|