1 /*-
2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
3 * Copyright (c) 2010-2011 Juniper Networks, Inc.
4 * All rights reserved.
5 *
6 * Portions of this software were developed by Robert N. M. Watson under
7 * contract to Juniper Networks, Inc.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $
34 * $KAME: udp6_output.c,v 1.31 2001/05/21 16:39:15 jinmei Exp $
35 */
36
37 /*-
38 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
39 * The Regents of the University of California.
40 * All rights reserved.
41 *
42 * Redistribution and use in source and binary forms, with or without
43 * modification, are permitted provided that the following conditions
44 * are met:
45 * 1. Redistributions of source code must retain the above copyright
46 * notice, this list of conditions and the following disclaimer.
47 * 2. Redistributions in binary form must reproduce the above copyright
48 * notice, this list of conditions and the following disclaimer in the
49 * documentation and/or other materials provided with the distribution.
50 * 4. Neither the name of the University nor the names of its contributors
51 * may be used to endorse or promote products derived from this software
52 * without specific prior written permission.
53 *
54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
64 * SUCH DAMAGE.
65 *
66 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95
67 */
68
69 #include <sys/cdefs.h>
70 __FBSDID("$FreeBSD$");
71
72 #include "opt_inet.h"
73 #include "opt_inet6.h"
74 #include "opt_ipfw.h"
75 #include "opt_ipsec.h"
76
77 #include <sys/param.h>
78 #include <sys/jail.h>
79 #include <sys/kernel.h>
80 #include <sys/lock.h>
81 #include <sys/mbuf.h>
82 #include <sys/priv.h>
83 #include <sys/proc.h>
84 #include <sys/protosw.h>
85 #include <sys/signalvar.h>
86 #include <sys/socket.h>
87 #include <sys/socketvar.h>
88 #include <sys/sx.h>
89 #include <sys/sysctl.h>
90 #include <sys/syslog.h>
91 #include <sys/systm.h>
92
93 #include <net/if.h>
94 #include <net/if_types.h>
95 #include <net/route.h>
96
97 #include <netinet/in.h>
98 #include <netinet/in_pcb.h>
99 #include <netinet/in_systm.h>
100 #include <netinet/in_var.h>
101 #include <netinet/ip.h>
102 #include <netinet/ip_icmp.h>
103 #include <netinet/ip6.h>
104 #include <netinet/icmp_var.h>
105 #include <netinet/icmp6.h>
106 #include <netinet/ip_var.h>
107 #include <netinet/udp.h>
108 #include <netinet/udp_var.h>
109
110 #include <netinet6/ip6protosw.h>
111 #include <netinet6/ip6_var.h>
112 #include <netinet6/in6_pcb.h>
113 #include <netinet6/udp6_var.h>
114 #include <netinet6/scope6_var.h>
115
116 #ifdef IPSEC
117 #include <netipsec/ipsec.h>
118 #include <netipsec/ipsec6.h>
119 #endif /* IPSEC */
120
121 #include <security/mac/mac_framework.h>
122
123 /*
124 * UDP protocol implementation.
125 * Per RFC 768, August, 1980.
126 */
127
128 extern struct protosw inetsw[];
129 static void udp6_detach(struct socket *so);
130
131 static void
132 udp6_append(struct inpcb *inp, struct mbuf *n, int off,
133 struct sockaddr_in6 *fromsa)
134 {
135 struct socket *so;
136 struct mbuf *opts;
137
138 INP_LOCK_ASSERT(inp);
139
140 #ifdef IPSEC
141 /* Check AH/ESP integrity. */
142 if (ipsec6_in_reject(n, inp)) {
143 m_freem(n);
144 IPSEC6STAT_INC(in_polvio);
145 return;
146 }
147 #endif /* IPSEC */
148 #ifdef MAC
149 if (mac_inpcb_check_deliver(inp, n) != 0) {
150 m_freem(n);
151 return;
152 }
153 #endif
154 opts = NULL;
155 if (inp->inp_flags & INP_CONTROLOPTS ||
156 inp->inp_socket->so_options & SO_TIMESTAMP)
157 ip6_savecontrol(inp, n, &opts);
158 m_adj(n, off + sizeof(struct udphdr));
159
160 so = inp->inp_socket;
161 SOCKBUF_LOCK(&so->so_rcv);
162 if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)fromsa, n,
163 opts) == 0) {
164 SOCKBUF_UNLOCK(&so->so_rcv);
165 m_freem(n);
166 if (opts)
167 m_freem(opts);
168 UDPSTAT_INC(udps_fullsock);
169 } else
170 sorwakeup_locked(so);
171 }
172
173 int
174 udp6_input(struct mbuf **mp, int *offp, int proto)
175 {
176 struct mbuf *m = *mp;
177 struct ifnet *ifp;
178 struct ip6_hdr *ip6;
179 struct udphdr *uh;
180 struct inpcb *inp;
181 struct udpcb *up;
182 int off = *offp;
183 int plen, ulen;
184 struct sockaddr_in6 fromsa;
185 struct m_tag *fwd_tag;
186 uint16_t uh_sum;
187
188 ifp = m->m_pkthdr.rcvif;
189 ip6 = mtod(m, struct ip6_hdr *);
190
191 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
192 /* XXX send icmp6 host/port unreach? */
193 m_freem(m);
194 return (IPPROTO_DONE);
195 }
196
197 #ifndef PULLDOWN_TEST
198 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
199 ip6 = mtod(m, struct ip6_hdr *);
200 uh = (struct udphdr *)((caddr_t)ip6 + off);
201 #else
202 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh));
203 if (!uh)
204 return (IPPROTO_DONE);
205 #endif
206
207 UDPSTAT_INC(udps_ipackets);
208
209 /*
210 * Destination port of 0 is illegal, based on RFC768.
211 */
212 if (uh->uh_dport == 0)
213 goto badunlocked;
214
215 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
216 ulen = ntohs((u_short)uh->uh_ulen);
217
218 if (plen != ulen) {
219 UDPSTAT_INC(udps_badlen);
220 goto badunlocked;
221 }
222
223 /*
224 * Checksum extended UDP header and data.
225 */
226 if (uh->uh_sum == 0) {
227 UDPSTAT_INC(udps_nosum);
228 goto badunlocked;
229 }
230
231 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID_IPV6) {
232 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
233 uh_sum = m->m_pkthdr.csum_data;
234 else
235 uh_sum = in6_cksum_pseudo(ip6, ulen,
236 IPPROTO_UDP, m->m_pkthdr.csum_data);
237 uh_sum ^= 0xffff;
238 } else
239 uh_sum = in6_cksum(m, IPPROTO_UDP, off, ulen);
240
241 if (uh_sum != 0) {
242 UDPSTAT_INC(udps_badsum);
243 goto badunlocked;
244 }
245
246 /*
247 * Construct sockaddr format source address.
248 */
249 init_sin6(&fromsa, m);
250 fromsa.sin6_port = uh->uh_sport;
251
252 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
253 struct inpcb *last;
254 struct ip6_moptions *imo;
255
256 INP_INFO_RLOCK(&V_udbinfo);
257 /*
258 * In the event that laddr should be set to the link-local
259 * address (this happens in RIPng), the multicast address
260 * specified in the received packet will not match laddr. To
261 * handle this situation, matching is relaxed if the
262 * receiving interface is the same as one specified in the
263 * socket and if the destination multicast address matches
264 * one of the multicast groups specified in the socket.
265 */
266
267 /*
268 * KAME note: traditionally we dropped udpiphdr from mbuf
269 * here. We need udphdr for IPsec processing so we do that
270 * later.
271 */
272 last = NULL;
273 LIST_FOREACH(inp, &V_udb, inp_list) {
274 if ((inp->inp_vflag & INP_IPV6) == 0)
275 continue;
276 if (inp->inp_lport != uh->uh_dport)
277 continue;
278 if (inp->inp_fport != 0 &&
279 inp->inp_fport != uh->uh_sport)
280 continue;
281 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
282 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
283 &ip6->ip6_dst))
284 continue;
285 }
286 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
287 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
288 &ip6->ip6_src) ||
289 inp->inp_fport != uh->uh_sport)
290 continue;
291 }
292
293 /*
294 * XXXRW: Because we weren't holding either the inpcb
295 * or the hash lock when we checked for a match
296 * before, we should probably recheck now that the
297 * inpcb lock is (supposed to be) held.
298 */
299
300 /*
301 * Handle socket delivery policy for any-source
302 * and source-specific multicast. [RFC3678]
303 */
304 imo = inp->in6p_moptions;
305 if (imo && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
306 struct sockaddr_in6 mcaddr;
307 int blocked;
308
309 INP_RLOCK(inp);
310
311 bzero(&mcaddr, sizeof(struct sockaddr_in6));
312 mcaddr.sin6_len = sizeof(struct sockaddr_in6);
313 mcaddr.sin6_family = AF_INET6;
314 mcaddr.sin6_addr = ip6->ip6_dst;
315
316 blocked = im6o_mc_filter(imo, ifp,
317 (struct sockaddr *)&mcaddr,
318 (struct sockaddr *)&fromsa);
319 if (blocked != MCAST_PASS) {
320 if (blocked == MCAST_NOTGMEMBER)
321 IP6STAT_INC(ip6s_notmember);
322 if (blocked == MCAST_NOTSMEMBER ||
323 blocked == MCAST_MUTED)
324 UDPSTAT_INC(udps_filtermcast);
325 INP_RUNLOCK(inp); /* XXX */
326 continue;
327 }
328
329 INP_RUNLOCK(inp);
330 }
331 if (last != NULL) {
332 struct mbuf *n;
333
334 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
335 INP_RLOCK(last);
336 up = intoudpcb(last);
337 if (up->u_tun_func == NULL) {
338 udp6_append(last, n, off, &fromsa);
339 } else {
340 /*
341 * Engage the tunneling
342 * protocol we will have to
343 * leave the info_lock up,
344 * since we are hunting
345 * through multiple UDP's.
346 *
347 */
348 (*up->u_tun_func)(n, off, last);
349 }
350 INP_RUNLOCK(last);
351 }
352 }
353 last = inp;
354 /*
355 * Don't look for additional matches if this one does
356 * not have either the SO_REUSEPORT or SO_REUSEADDR
357 * socket options set. This heuristic avoids
358 * searching through all pcbs in the common case of a
359 * non-shared port. It assumes that an application
360 * will never clear these options after setting them.
361 */
362 if ((last->inp_socket->so_options &
363 (SO_REUSEPORT|SO_REUSEADDR)) == 0)
364 break;
365 }
366
367 if (last == NULL) {
368 /*
369 * No matching pcb found; discard datagram. (No need
370 * to send an ICMP Port Unreachable for a broadcast
371 * or multicast datgram.)
372 */
373 UDPSTAT_INC(udps_noport);
374 UDPSTAT_INC(udps_noportmcast);
375 goto badheadlocked;
376 }
377 INP_RLOCK(last);
378 INP_INFO_RUNLOCK(&V_udbinfo);
379 up = intoudpcb(last);
380 if (up->u_tun_func == NULL) {
381 udp6_append(last, m, off, &fromsa);
382 } else {
383 /*
384 * Engage the tunneling protocol.
385 */
386 (*up->u_tun_func)(m, off, last);
387 }
388 INP_RUNLOCK(last);
389 return (IPPROTO_DONE);
390 }
391 /*
392 * Locate pcb for datagram.
393 */
394
395 /*
396 * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
397 */
398 if ((m->m_flags & M_IP6_NEXTHOP) &&
399 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
400 struct sockaddr_in6 *next_hop6;
401
402 next_hop6 = (struct sockaddr_in6 *)(fwd_tag + 1);
403
404 /*
405 * Transparently forwarded. Pretend to be the destination.
406 * Already got one like this?
407 */
408 inp = in6_pcblookup_mbuf(&V_udbinfo,
409 &ip6->ip6_src, uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
410 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif, m);
411 if (!inp) {
412 /*
413 * It's new. Try to find the ambushing socket.
414 * Because we've rewritten the destination address,
415 * any hardware-generated hash is ignored.
416 */
417 inp = in6_pcblookup(&V_udbinfo, &ip6->ip6_src,
418 uh->uh_sport, &next_hop6->sin6_addr,
419 next_hop6->sin6_port ? htons(next_hop6->sin6_port) :
420 uh->uh_dport, INPLOOKUP_WILDCARD |
421 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif);
422 }
423 /* Remove the tag from the packet. We don't need it anymore. */
424 m_tag_delete(m, fwd_tag);
425 m->m_flags &= ~M_IP6_NEXTHOP;
426 } else
427 inp = in6_pcblookup_mbuf(&V_udbinfo, &ip6->ip6_src,
428 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
429 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB,
430 m->m_pkthdr.rcvif, m);
431 if (inp == NULL) {
432 if (udp_log_in_vain) {
433 char ip6bufs[INET6_ADDRSTRLEN];
434 char ip6bufd[INET6_ADDRSTRLEN];
435
436 log(LOG_INFO,
437 "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
438 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
439 ntohs(uh->uh_dport),
440 ip6_sprintf(ip6bufs, &ip6->ip6_src),
441 ntohs(uh->uh_sport));
442 }
443 UDPSTAT_INC(udps_noport);
444 if (m->m_flags & M_MCAST) {
445 printf("UDP6: M_MCAST is set in a unicast packet.\n");
446 UDPSTAT_INC(udps_noportmcast);
447 goto badunlocked;
448 }
449 if (V_udp_blackhole)
450 goto badunlocked;
451 if (badport_bandlim(BANDLIM_ICMP6_UNREACH) < 0)
452 goto badunlocked;
453 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
454 return (IPPROTO_DONE);
455 }
456 INP_RLOCK_ASSERT(inp);
457 up = intoudpcb(inp);
458 if (up->u_tun_func == NULL) {
459 udp6_append(inp, m, off, &fromsa);
460 } else {
461 /*
462 * Engage the tunneling protocol.
463 */
464
465 (*up->u_tun_func)(m, off, inp);
466 }
467 INP_RUNLOCK(inp);
468 return (IPPROTO_DONE);
469
470 badheadlocked:
471 INP_INFO_RUNLOCK(&V_udbinfo);
472 badunlocked:
473 if (m)
474 m_freem(m);
475 return (IPPROTO_DONE);
476 }
477
478 void
479 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
480 {
481 struct udphdr uh;
482 struct ip6_hdr *ip6;
483 struct mbuf *m;
484 int off = 0;
485 struct ip6ctlparam *ip6cp = NULL;
486 const struct sockaddr_in6 *sa6_src = NULL;
487 void *cmdarg;
488 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify;
489 struct udp_portonly {
490 u_int16_t uh_sport;
491 u_int16_t uh_dport;
492 } *uhp;
493
494 if (sa->sa_family != AF_INET6 ||
495 sa->sa_len != sizeof(struct sockaddr_in6))
496 return;
497
498 if ((unsigned)cmd >= PRC_NCMDS)
499 return;
500 if (PRC_IS_REDIRECT(cmd))
501 notify = in6_rtchange, d = NULL;
502 else if (cmd == PRC_HOSTDEAD)
503 d = NULL;
504 else if (inet6ctlerrmap[cmd] == 0)
505 return;
506
507 /* if the parameter is from icmp6, decode it. */
508 if (d != NULL) {
509 ip6cp = (struct ip6ctlparam *)d;
510 m = ip6cp->ip6c_m;
511 ip6 = ip6cp->ip6c_ip6;
512 off = ip6cp->ip6c_off;
513 cmdarg = ip6cp->ip6c_cmdarg;
514 sa6_src = ip6cp->ip6c_src;
515 } else {
516 m = NULL;
517 ip6 = NULL;
518 cmdarg = NULL;
519 sa6_src = &sa6_any;
520 }
521
522 if (ip6) {
523 /*
524 * XXX: We assume that when IPV6 is non NULL,
525 * M and OFF are valid.
526 */
527
528 /* Check if we can safely examine src and dst ports. */
529 if (m->m_pkthdr.len < off + sizeof(*uhp))
530 return;
531
532 bzero(&uh, sizeof(uh));
533 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
534
535 (void) in6_pcbnotify(&V_udbinfo, sa, uh.uh_dport,
536 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd,
537 cmdarg, notify);
538 } else
539 (void) in6_pcbnotify(&V_udbinfo, sa, 0,
540 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
541 }
542
543 static int
544 udp6_getcred(SYSCTL_HANDLER_ARGS)
545 {
546 struct xucred xuc;
547 struct sockaddr_in6 addrs[2];
548 struct inpcb *inp;
549 int error;
550
551 error = priv_check(req->td, PRIV_NETINET_GETCRED);
552 if (error)
553 return (error);
554
555 if (req->newlen != sizeof(addrs))
556 return (EINVAL);
557 if (req->oldlen != sizeof(struct xucred))
558 return (EINVAL);
559 error = SYSCTL_IN(req, addrs, sizeof(addrs));
560 if (error)
561 return (error);
562 if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 ||
563 (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) {
564 return (error);
565 }
566 inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr,
567 addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port,
568 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
569 if (inp != NULL) {
570 INP_RLOCK_ASSERT(inp);
571 if (inp->inp_socket == NULL)
572 error = ENOENT;
573 if (error == 0)
574 error = cr_canseesocket(req->td->td_ucred,
575 inp->inp_socket);
576 if (error == 0)
577 cru2x(inp->inp_cred, &xuc);
578 INP_RUNLOCK(inp);
579 } else
580 error = ENOENT;
581 if (error == 0)
582 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
583 return (error);
584 }
585
586 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0,
587 0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection");
588
589 static int
590 udp6_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr6,
591 struct mbuf *control, struct thread *td)
592 {
593 u_int32_t ulen = m->m_pkthdr.len;
594 u_int32_t plen = sizeof(struct udphdr) + ulen;
595 struct ip6_hdr *ip6;
596 struct udphdr *udp6;
597 struct in6_addr *laddr, *faddr, in6a;
598 struct sockaddr_in6 *sin6 = NULL;
599 struct ifnet *oifp = NULL;
600 int scope_ambiguous = 0;
601 u_short fport;
602 int error = 0;
603 struct ip6_pktopts *optp, opt;
604 int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
605 int flags;
606 struct sockaddr_in6 tmp;
607
608 INP_WLOCK_ASSERT(inp);
609 INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
610
611 if (addr6) {
612 /* addr6 has been validated in udp6_send(). */
613 sin6 = (struct sockaddr_in6 *)addr6;
614
615 /* protect *sin6 from overwrites */
616 tmp = *sin6;
617 sin6 = &tmp;
618
619 /*
620 * Application should provide a proper zone ID or the use of
621 * default zone IDs should be enabled. Unfortunately, some
622 * applications do not behave as it should, so we need a
623 * workaround. Even if an appropriate ID is not determined,
624 * we'll see if we can determine the outgoing interface. If we
625 * can, determine the zone ID based on the interface below.
626 */
627 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone)
628 scope_ambiguous = 1;
629 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
630 return (error);
631 }
632
633 if (control) {
634 if ((error = ip6_setpktopts(control, &opt,
635 inp->in6p_outputopts, td->td_ucred, IPPROTO_UDP)) != 0)
636 goto release;
637 optp = &opt;
638 } else
639 optp = inp->in6p_outputopts;
640
641 if (sin6) {
642 faddr = &sin6->sin6_addr;
643
644 /*
645 * IPv4 version of udp_output calls in_pcbconnect in this case,
646 * which needs splnet and affects performance.
647 * Since we saw no essential reason for calling in_pcbconnect,
648 * we get rid of such kind of logic, and call in6_selectsrc
649 * and in6_pcbsetport in order to fill in the local address
650 * and the local port.
651 */
652 if (sin6->sin6_port == 0) {
653 error = EADDRNOTAVAIL;
654 goto release;
655 }
656
657 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
658 /* how about ::ffff:0.0.0.0 case? */
659 error = EISCONN;
660 goto release;
661 }
662
663 fport = sin6->sin6_port; /* allow 0 port */
664
665 if (IN6_IS_ADDR_V4MAPPED(faddr)) {
666 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
667 /*
668 * I believe we should explicitly discard the
669 * packet when mapped addresses are disabled,
670 * rather than send the packet as an IPv6 one.
671 * If we chose the latter approach, the packet
672 * might be sent out on the wire based on the
673 * default route, the situation which we'd
674 * probably want to avoid.
675 * (20010421 jinmei@kame.net)
676 */
677 error = EINVAL;
678 goto release;
679 }
680 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
681 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) {
682 /*
683 * when remote addr is an IPv4-mapped address,
684 * local addr should not be an IPv6 address,
685 * since you cannot determine how to map IPv6
686 * source address to IPv4.
687 */
688 error = EINVAL;
689 goto release;
690 }
691
692 af = AF_INET;
693 }
694
695 if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
696 error = in6_selectsrc(sin6, optp, inp, NULL,
697 td->td_ucred, &oifp, &in6a);
698 if (error)
699 goto release;
700 if (oifp && scope_ambiguous &&
701 (error = in6_setscope(&sin6->sin6_addr,
702 oifp, NULL))) {
703 goto release;
704 }
705 laddr = &in6a;
706 } else
707 laddr = &inp->in6p_laddr; /* XXX */
708 if (laddr == NULL) {
709 if (error == 0)
710 error = EADDRNOTAVAIL;
711 goto release;
712 }
713 if (inp->inp_lport == 0 &&
714 (error = in6_pcbsetport(laddr, inp, td->td_ucred)) != 0) {
715 /* Undo an address bind that may have occurred. */
716 inp->in6p_laddr = in6addr_any;
717 goto release;
718 }
719 } else {
720 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
721 error = ENOTCONN;
722 goto release;
723 }
724 if (IN6_IS_ADDR_V4MAPPED(&inp->in6p_faddr)) {
725 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
726 /*
727 * XXX: this case would happen when the
728 * application sets the V6ONLY flag after
729 * connecting the foreign address.
730 * Such applications should be fixed,
731 * so we bark here.
732 */
733 log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
734 "option was set for a connected socket\n");
735 error = EINVAL;
736 goto release;
737 } else
738 af = AF_INET;
739 }
740 laddr = &inp->in6p_laddr;
741 faddr = &inp->in6p_faddr;
742 fport = inp->inp_fport;
743 }
744
745 if (af == AF_INET)
746 hlen = sizeof(struct ip);
747
748 /*
749 * Calculate data length and get a mbuf
750 * for UDP and IP6 headers.
751 */
752 M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT);
753 if (m == 0) {
754 error = ENOBUFS;
755 goto release;
756 }
757
758 /*
759 * Stuff checksum and output datagram.
760 */
761 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
762 udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */
763 udp6->uh_dport = fport;
764 if (plen <= 0xffff)
765 udp6->uh_ulen = htons((u_short)plen);
766 else
767 udp6->uh_ulen = 0;
768 udp6->uh_sum = 0;
769
770 switch (af) {
771 case AF_INET6:
772 ip6 = mtod(m, struct ip6_hdr *);
773 ip6->ip6_flow = inp->inp_flow & IPV6_FLOWINFO_MASK;
774 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
775 ip6->ip6_vfc |= IPV6_VERSION;
776 #if 0 /* ip6_plen will be filled in ip6_output. */
777 ip6->ip6_plen = htons((u_short)plen);
778 #endif
779 ip6->ip6_nxt = IPPROTO_UDP;
780 ip6->ip6_hlim = in6_selecthlim(inp, NULL);
781 ip6->ip6_src = *laddr;
782 ip6->ip6_dst = *faddr;
783
784 udp6->uh_sum = in6_cksum_pseudo(ip6, plen, IPPROTO_UDP, 0);
785 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6;
786 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
787
788 flags = 0;
789
790 UDPSTAT_INC(udps_opackets);
791 error = ip6_output(m, optp, NULL, flags, inp->in6p_moptions,
792 NULL, inp);
793 break;
794 case AF_INET:
795 error = EAFNOSUPPORT;
796 goto release;
797 }
798 goto releaseopt;
799
800 release:
801 m_freem(m);
802
803 releaseopt:
804 if (control) {
805 ip6_clearpktopts(&opt, -1);
806 m_freem(control);
807 }
808 return (error);
809 }
810
811 static void
812 udp6_abort(struct socket *so)
813 {
814 struct inpcb *inp;
815
816 inp = sotoinpcb(so);
817 KASSERT(inp != NULL, ("udp6_abort: inp == NULL"));
818
819 #ifdef INET
820 if (inp->inp_vflag & INP_IPV4) {
821 struct pr_usrreqs *pru;
822
823 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
824 (*pru->pru_abort)(so);
825 return;
826 }
827 #endif
828
829 INP_WLOCK(inp);
830 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
831 INP_HASH_WLOCK(&V_udbinfo);
832 in6_pcbdisconnect(inp);
833 inp->in6p_laddr = in6addr_any;
834 INP_HASH_WUNLOCK(&V_udbinfo);
835 soisdisconnected(so);
836 }
837 INP_WUNLOCK(inp);
838 }
839
840 static int
841 udp6_attach(struct socket *so, int proto, struct thread *td)
842 {
843 struct inpcb *inp;
844 int error;
845
846 inp = sotoinpcb(so);
847 KASSERT(inp == NULL, ("udp6_attach: inp != NULL"));
848
849 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
850 error = soreserve(so, udp_sendspace, udp_recvspace);
851 if (error)
852 return (error);
853 }
854 INP_INFO_WLOCK(&V_udbinfo);
855 error = in_pcballoc(so, &V_udbinfo);
856 if (error) {
857 INP_INFO_WUNLOCK(&V_udbinfo);
858 return (error);
859 }
860 inp = (struct inpcb *)so->so_pcb;
861 inp->inp_vflag |= INP_IPV6;
862 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
863 inp->inp_vflag |= INP_IPV4;
864 inp->in6p_hops = -1; /* use kernel default */
865 inp->in6p_cksum = -1; /* just to be sure */
866 /*
867 * XXX: ugly!!
868 * IPv4 TTL initialization is necessary for an IPv6 socket as well,
869 * because the socket may be bound to an IPv6 wildcard address,
870 * which may match an IPv4-mapped IPv6 address.
871 */
872 inp->inp_ip_ttl = V_ip_defttl;
873
874 error = udp_newudpcb(inp);
875 if (error) {
876 in_pcbdetach(inp);
877 in_pcbfree(inp);
878 INP_INFO_WUNLOCK(&V_udbinfo);
879 return (error);
880 }
881 INP_WUNLOCK(inp);
882 INP_INFO_WUNLOCK(&V_udbinfo);
883 return (0);
884 }
885
886 static int
887 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
888 {
889 struct inpcb *inp;
890 int error;
891
892 inp = sotoinpcb(so);
893 KASSERT(inp != NULL, ("udp6_bind: inp == NULL"));
894
895 INP_WLOCK(inp);
896 INP_HASH_WLOCK(&V_udbinfo);
897 inp->inp_vflag &= ~INP_IPV4;
898 inp->inp_vflag |= INP_IPV6;
899 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
900 struct sockaddr_in6 *sin6_p;
901
902 sin6_p = (struct sockaddr_in6 *)nam;
903
904 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
905 inp->inp_vflag |= INP_IPV4;
906 #ifdef INET
907 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
908 struct sockaddr_in sin;
909
910 in6_sin6_2_sin(&sin, sin6_p);
911 inp->inp_vflag |= INP_IPV4;
912 inp->inp_vflag &= ~INP_IPV6;
913 error = in_pcbbind(inp, (struct sockaddr *)&sin,
914 td->td_ucred);
915 goto out;
916 }
917 #endif
918 }
919
920 error = in6_pcbbind(inp, nam, td->td_ucred);
921 #ifdef INET
922 out:
923 #endif
924 INP_HASH_WUNLOCK(&V_udbinfo);
925 INP_WUNLOCK(inp);
926 return (error);
927 }
928
929 static void
930 udp6_close(struct socket *so)
931 {
932 struct inpcb *inp;
933
934 inp = sotoinpcb(so);
935 KASSERT(inp != NULL, ("udp6_close: inp == NULL"));
936
937 #ifdef INET
938 if (inp->inp_vflag & INP_IPV4) {
939 struct pr_usrreqs *pru;
940
941 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
942 (*pru->pru_disconnect)(so);
943 return;
944 }
945 #endif
946 INP_WLOCK(inp);
947 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
948 INP_HASH_WLOCK(&V_udbinfo);
949 in6_pcbdisconnect(inp);
950 inp->in6p_laddr = in6addr_any;
951 INP_HASH_WUNLOCK(&V_udbinfo);
952 soisdisconnected(so);
953 }
954 INP_WUNLOCK(inp);
955 }
956
957 static int
958 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
959 {
960 struct inpcb *inp;
961 struct sockaddr_in6 *sin6;
962 int error;
963
964 inp = sotoinpcb(so);
965 sin6 = (struct sockaddr_in6 *)nam;
966 KASSERT(inp != NULL, ("udp6_connect: inp == NULL"));
967
968 /*
969 * XXXRW: Need to clarify locking of v4/v6 flags.
970 */
971 INP_WLOCK(inp);
972 #ifdef INET
973 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
974 struct sockaddr_in sin;
975
976 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
977 error = EINVAL;
978 goto out;
979 }
980 if (inp->inp_faddr.s_addr != INADDR_ANY) {
981 error = EISCONN;
982 goto out;
983 }
984 in6_sin6_2_sin(&sin, sin6);
985 inp->inp_vflag |= INP_IPV4;
986 inp->inp_vflag &= ~INP_IPV6;
987 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr);
988 if (error != 0)
989 goto out;
990 INP_HASH_WLOCK(&V_udbinfo);
991 error = in_pcbconnect(inp, (struct sockaddr *)&sin,
992 td->td_ucred);
993 INP_HASH_WUNLOCK(&V_udbinfo);
994 if (error == 0)
995 soisconnected(so);
996 goto out;
997 }
998 #endif
999 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1000 error = EISCONN;
1001 goto out;
1002 }
1003 inp->inp_vflag &= ~INP_IPV4;
1004 inp->inp_vflag |= INP_IPV6;
1005 error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr);
1006 if (error != 0)
1007 goto out;
1008 INP_HASH_WLOCK(&V_udbinfo);
1009 error = in6_pcbconnect(inp, nam, td->td_ucred);
1010 INP_HASH_WUNLOCK(&V_udbinfo);
1011 if (error == 0)
1012 soisconnected(so);
1013 out:
1014 INP_WUNLOCK(inp);
1015 return (error);
1016 }
1017
1018 static void
1019 udp6_detach(struct socket *so)
1020 {
1021 struct inpcb *inp;
1022 struct udpcb *up;
1023
1024 inp = sotoinpcb(so);
1025 KASSERT(inp != NULL, ("udp6_detach: inp == NULL"));
1026
1027 INP_INFO_WLOCK(&V_udbinfo);
1028 INP_WLOCK(inp);
1029 up = intoudpcb(inp);
1030 KASSERT(up != NULL, ("%s: up == NULL", __func__));
1031 in_pcbdetach(inp);
1032 in_pcbfree(inp);
1033 INP_INFO_WUNLOCK(&V_udbinfo);
1034 udp_discardcb(up);
1035 }
1036
1037 static int
1038 udp6_disconnect(struct socket *so)
1039 {
1040 struct inpcb *inp;
1041 int error;
1042
1043 inp = sotoinpcb(so);
1044 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL"));
1045
1046 #ifdef INET
1047 if (inp->inp_vflag & INP_IPV4) {
1048 struct pr_usrreqs *pru;
1049
1050 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
1051 (void)(*pru->pru_disconnect)(so);
1052 return (0);
1053 }
1054 #endif
1055
1056 INP_WLOCK(inp);
1057
1058 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1059 error = ENOTCONN;
1060 goto out;
1061 }
1062
1063 INP_HASH_WLOCK(&V_udbinfo);
1064 in6_pcbdisconnect(inp);
1065 inp->in6p_laddr = in6addr_any;
1066 INP_HASH_WUNLOCK(&V_udbinfo);
1067 SOCK_LOCK(so);
1068 so->so_state &= ~SS_ISCONNECTED; /* XXX */
1069 SOCK_UNLOCK(so);
1070 out:
1071 INP_WUNLOCK(inp);
1072 return (0);
1073 }
1074
1075 static int
1076 udp6_send(struct socket *so, int flags, struct mbuf *m,
1077 struct sockaddr *addr, struct mbuf *control, struct thread *td)
1078 {
1079 struct inpcb *inp;
1080 int error = 0;
1081
1082 inp = sotoinpcb(so);
1083 KASSERT(inp != NULL, ("udp6_send: inp == NULL"));
1084
1085 INP_WLOCK(inp);
1086 if (addr) {
1087 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
1088 error = EINVAL;
1089 goto bad;
1090 }
1091 if (addr->sa_family != AF_INET6) {
1092 error = EAFNOSUPPORT;
1093 goto bad;
1094 }
1095 }
1096
1097 #ifdef INET
1098 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
1099 int hasv4addr;
1100 struct sockaddr_in6 *sin6 = 0;
1101
1102 if (addr == 0)
1103 hasv4addr = (inp->inp_vflag & INP_IPV4);
1104 else {
1105 sin6 = (struct sockaddr_in6 *)addr;
1106 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
1107 ? 1 : 0;
1108 }
1109 if (hasv4addr) {
1110 struct pr_usrreqs *pru;
1111
1112 /*
1113 * XXXRW: We release UDP-layer locks before calling
1114 * udp_send() in order to avoid recursion. However,
1115 * this does mean there is a short window where inp's
1116 * fields are unstable. Could this lead to a
1117 * potential race in which the factors causing us to
1118 * select the UDPv4 output routine are invalidated?
1119 */
1120 INP_WUNLOCK(inp);
1121 if (sin6)
1122 in6_sin6_2_sin_in_sock(addr);
1123 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
1124 /* addr will just be freed in sendit(). */
1125 return ((*pru->pru_send)(so, flags, m, addr, control,
1126 td));
1127 }
1128 }
1129 #endif
1130 #ifdef MAC
1131 mac_inpcb_create_mbuf(inp, m);
1132 #endif
1133 INP_HASH_WLOCK(&V_udbinfo);
1134 error = udp6_output(inp, m, addr, control, td);
1135 INP_HASH_WUNLOCK(&V_udbinfo);
1136 #ifdef INET
1137 #endif
1138 INP_WUNLOCK(inp);
1139 return (error);
1140
1141 bad:
1142 INP_WUNLOCK(inp);
1143 m_freem(m);
1144 return (error);
1145 }
1146
1147 struct pr_usrreqs udp6_usrreqs = {
1148 .pru_abort = udp6_abort,
1149 .pru_attach = udp6_attach,
1150 .pru_bind = udp6_bind,
1151 .pru_connect = udp6_connect,
1152 .pru_control = in6_control,
1153 .pru_detach = udp6_detach,
1154 .pru_disconnect = udp6_disconnect,
1155 .pru_peeraddr = in6_mapped_peeraddr,
1156 .pru_send = udp6_send,
1157 .pru_shutdown = udp_shutdown,
1158 .pru_sockaddr = in6_mapped_sockaddr,
1159 .pru_soreceive = soreceive_dgram,
1160 .pru_sosend = sosend_dgram,
1161 .pru_sosetlabel = in_pcbsosetlabel,
1162 .pru_close = udp6_close
1163 };
Cache object: 42f6d0a15997b8243424c3bec7a15b99
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