1 /*-
2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $
30 * $KAME: udp6_output.c,v 1.31 2001/05/21 16:39:15 jinmei Exp $
31 */
32
33 /*-
34 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
35 * The Regents of the University of California.
36 * All rights reserved.
37 *
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
40 * are met:
41 * 1. Redistributions of source code must retain the above copyright
42 * notice, this list of conditions and the following disclaimer.
43 * 2. Redistributions in binary form must reproduce the above copyright
44 * notice, this list of conditions and the following disclaimer in the
45 * documentation and/or other materials provided with the distribution.
46 * 4. Neither the name of the University nor the names of its contributors
47 * may be used to endorse or promote products derived from this software
48 * without specific prior written permission.
49 *
50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60 * SUCH DAMAGE.
61 *
62 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95
63 */
64
65 #include <sys/cdefs.h>
66 __FBSDID("$FreeBSD: src/sys/netinet6/udp6_usrreq.c,v 1.101 2008/12/02 21:37:28 bz Exp $");
67
68 #include "opt_inet.h"
69 #include "opt_inet6.h"
70 #include "opt_ipsec.h"
71 #include "opt_mac.h"
72
73 #include <sys/param.h>
74 #include <sys/jail.h>
75 #include <sys/kernel.h>
76 #include <sys/lock.h>
77 #include <sys/mbuf.h>
78 #include <sys/priv.h>
79 #include <sys/proc.h>
80 #include <sys/protosw.h>
81 #include <sys/signalvar.h>
82 #include <sys/socket.h>
83 #include <sys/socketvar.h>
84 #include <sys/sx.h>
85 #include <sys/sysctl.h>
86 #include <sys/syslog.h>
87 #include <sys/systm.h>
88 #include <sys/vimage.h>
89
90 #include <net/if.h>
91 #include <net/if_types.h>
92 #include <net/route.h>
93
94 #include <netinet/in.h>
95 #include <netinet/in_pcb.h>
96 #include <netinet/in_systm.h>
97 #include <netinet/in_var.h>
98 #include <netinet/ip.h>
99 #include <netinet/ip_icmp.h>
100 #include <netinet/ip6.h>
101 #include <netinet/icmp_var.h>
102 #include <netinet/icmp6.h>
103 #include <netinet/ip_var.h>
104 #include <netinet/udp.h>
105 #include <netinet/udp_var.h>
106 #include <netinet/vinet.h>
107
108 #include <netinet6/ip6protosw.h>
109 #include <netinet6/ip6_var.h>
110 #include <netinet6/in6_pcb.h>
111 #include <netinet6/udp6_var.h>
112 #include <netinet6/scope6_var.h>
113 #include <netinet6/vinet6.h>
114
115 #ifdef IPSEC
116 #include <netipsec/ipsec.h>
117 #include <netipsec/ipsec6.h>
118 #endif /* IPSEC */
119
120 #include <security/mac/mac_framework.h>
121
122 /*
123 * UDP protocol implementation.
124 * Per RFC 768, August, 1980.
125 */
126
127 extern struct protosw inetsw[];
128 static void udp6_detach(struct socket *so);
129
130 static void
131 udp6_append(struct inpcb *inp, struct mbuf *n, int off,
132 struct sockaddr_in6 *fromsa)
133 {
134 INIT_VNET_INET(inp->inp_vnet);
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 INIT_VNET_IPSEC(inp->inp_vnet);
144 m_freem(n);
145 V_ipsec6stat.in_polvio++;
146 return;
147 }
148 #endif /* IPSEC */
149 #ifdef MAC
150 if (mac_inpcb_check_deliver(inp, n) != 0) {
151 m_freem(n);
152 return;
153 }
154 #endif
155 opts = NULL;
156 if (inp->in6p_flags & IN6P_CONTROLOPTS ||
157 inp->inp_socket->so_options & SO_TIMESTAMP)
158 ip6_savecontrol(inp, n, &opts);
159 m_adj(n, off + sizeof(struct udphdr));
160
161 so = inp->inp_socket;
162 SOCKBUF_LOCK(&so->so_rcv);
163 if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)fromsa, n,
164 opts) == 0) {
165 SOCKBUF_UNLOCK(&so->so_rcv);
166 m_freem(n);
167 if (opts)
168 m_freem(opts);
169 V_udpstat.udps_fullsock++;
170 } else
171 sorwakeup_locked(so);
172 }
173
174 int
175 udp6_input(struct mbuf **mp, int *offp, int proto)
176 {
177 INIT_VNET_INET(curvnet);
178 INIT_VNET_INET6(curvnet);
179 struct mbuf *m = *mp;
180 struct ip6_hdr *ip6;
181 struct udphdr *uh;
182 struct inpcb *inp;
183 int off = *offp;
184 int plen, ulen;
185 struct sockaddr_in6 fromsa;
186
187 ip6 = mtod(m, struct ip6_hdr *);
188
189 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
190 /* XXX send icmp6 host/port unreach? */
191 m_freem(m);
192 return (IPPROTO_DONE);
193 }
194
195 #ifndef PULLDOWN_TEST
196 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
197 ip6 = mtod(m, struct ip6_hdr *);
198 uh = (struct udphdr *)((caddr_t)ip6 + off);
199 #else
200 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh));
201 if (!uh)
202 return (IPPROTO_DONE);
203 #endif
204
205 V_udpstat.udps_ipackets++;
206
207 /*
208 * Destination port of 0 is illegal, based on RFC768.
209 */
210 if (uh->uh_dport == 0)
211 goto badunlocked;
212
213 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
214 ulen = ntohs((u_short)uh->uh_ulen);
215
216 if (plen != ulen) {
217 V_udpstat.udps_badlen++;
218 goto badunlocked;
219 }
220
221 /*
222 * Checksum extended UDP header and data.
223 */
224 if (uh->uh_sum == 0) {
225 V_udpstat.udps_nosum++;
226 goto badunlocked;
227 }
228 if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
229 V_udpstat.udps_badsum++;
230 goto badunlocked;
231 }
232
233 /*
234 * Construct sockaddr format source address.
235 */
236 init_sin6(&fromsa, m);
237 fromsa.sin6_port = uh->uh_sport;
238
239 INP_INFO_RLOCK(&V_udbinfo);
240 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
241 struct inpcb *last;
242
243 /*
244 * In the event that laddr should be set to the link-local
245 * address (this happens in RIPng), the multicast address
246 * specified in the received packet will not match laddr. To
247 * handle this situation, matching is relaxed if the
248 * receiving interface is the same as one specified in the
249 * socket and if the destination multicast address matches
250 * one of the multicast groups specified in the socket.
251 */
252
253 /*
254 * KAME note: traditionally we dropped udpiphdr from mbuf
255 * here. We need udphdr for IPsec processing so we do that
256 * later.
257 */
258 last = NULL;
259 LIST_FOREACH(inp, &V_udb, inp_list) {
260 if ((inp->inp_vflag & INP_IPV6) == 0)
261 continue;
262 if (inp->in6p_lport != uh->uh_dport)
263 continue;
264 /*
265 * XXX: Do not check source port of incoming datagram
266 * unless inp_connect() has been called to bind the
267 * fport part of the 4-tuple; the source could be
268 * trying to talk to us with an ephemeral port.
269 */
270 if (inp->inp_fport != 0 &&
271 inp->inp_fport != uh->uh_sport)
272 continue;
273 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
274 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
275 &ip6->ip6_dst))
276 continue;
277 }
278 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
279 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
280 &ip6->ip6_src) ||
281 inp->in6p_fport != uh->uh_sport)
282 continue;
283 }
284
285 if (last != NULL) {
286 struct mbuf *n;
287
288 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
289 INP_RLOCK(last);
290 udp6_append(last, n, off, &fromsa);
291 INP_RUNLOCK(last);
292 }
293 }
294 last = inp;
295 /*
296 * Don't look for additional matches if this one does
297 * not have either the SO_REUSEPORT or SO_REUSEADDR
298 * socket options set. This heuristic avoids
299 * searching through all pcbs in the common case of a
300 * non-shared port. It assumes that an application
301 * will never clear these options after setting them.
302 */
303 if ((last->inp_socket->so_options &
304 (SO_REUSEPORT|SO_REUSEADDR)) == 0)
305 break;
306 }
307
308 if (last == NULL) {
309 /*
310 * No matching pcb found; discard datagram. (No need
311 * to send an ICMP Port Unreachable for a broadcast
312 * or multicast datgram.)
313 */
314 V_udpstat.udps_noport++;
315 V_udpstat.udps_noportmcast++;
316 goto badheadlocked;
317 }
318 INP_RLOCK(last);
319 INP_INFO_RUNLOCK(&V_udbinfo);
320 udp6_append(last, m, off, &fromsa);
321 INP_RUNLOCK(last);
322 return (IPPROTO_DONE);
323 }
324 /*
325 * Locate pcb for datagram.
326 */
327 inp = in6_pcblookup_hash(&V_udbinfo, &ip6->ip6_src, uh->uh_sport,
328 &ip6->ip6_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif);
329 if (inp == NULL) {
330 if (udp_log_in_vain) {
331 char ip6bufs[INET6_ADDRSTRLEN];
332 char ip6bufd[INET6_ADDRSTRLEN];
333
334 log(LOG_INFO,
335 "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
336 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
337 ntohs(uh->uh_dport),
338 ip6_sprintf(ip6bufs, &ip6->ip6_src),
339 ntohs(uh->uh_sport));
340 }
341 V_udpstat.udps_noport++;
342 if (m->m_flags & M_MCAST) {
343 printf("UDP6: M_MCAST is set in a unicast packet.\n");
344 V_udpstat.udps_noportmcast++;
345 goto badheadlocked;
346 }
347 INP_INFO_RUNLOCK(&V_udbinfo);
348 if (V_udp_blackhole)
349 goto badunlocked;
350 if (badport_bandlim(BANDLIM_ICMP6_UNREACH) < 0)
351 goto badunlocked;
352 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
353 return (IPPROTO_DONE);
354 }
355 INP_RLOCK(inp);
356 INP_INFO_RUNLOCK(&V_udbinfo);
357 udp6_append(inp, m, off, &fromsa);
358 INP_RUNLOCK(inp);
359 return (IPPROTO_DONE);
360
361 badheadlocked:
362 INP_INFO_RUNLOCK(&V_udbinfo);
363 badunlocked:
364 if (m)
365 m_freem(m);
366 return (IPPROTO_DONE);
367 }
368
369 void
370 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
371 {
372 INIT_VNET_INET(curvnet);
373 struct udphdr uh;
374 struct ip6_hdr *ip6;
375 struct mbuf *m;
376 int off = 0;
377 struct ip6ctlparam *ip6cp = NULL;
378 const struct sockaddr_in6 *sa6_src = NULL;
379 void *cmdarg;
380 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify;
381 struct udp_portonly {
382 u_int16_t uh_sport;
383 u_int16_t uh_dport;
384 } *uhp;
385
386 if (sa->sa_family != AF_INET6 ||
387 sa->sa_len != sizeof(struct sockaddr_in6))
388 return;
389
390 if ((unsigned)cmd >= PRC_NCMDS)
391 return;
392 if (PRC_IS_REDIRECT(cmd))
393 notify = in6_rtchange, d = NULL;
394 else if (cmd == PRC_HOSTDEAD)
395 d = NULL;
396 else if (inet6ctlerrmap[cmd] == 0)
397 return;
398
399 /* if the parameter is from icmp6, decode it. */
400 if (d != NULL) {
401 ip6cp = (struct ip6ctlparam *)d;
402 m = ip6cp->ip6c_m;
403 ip6 = ip6cp->ip6c_ip6;
404 off = ip6cp->ip6c_off;
405 cmdarg = ip6cp->ip6c_cmdarg;
406 sa6_src = ip6cp->ip6c_src;
407 } else {
408 m = NULL;
409 ip6 = NULL;
410 cmdarg = NULL;
411 sa6_src = &sa6_any;
412 }
413
414 if (ip6) {
415 /*
416 * XXX: We assume that when IPV6 is non NULL,
417 * M and OFF are valid.
418 */
419
420 /* Check if we can safely examine src and dst ports. */
421 if (m->m_pkthdr.len < off + sizeof(*uhp))
422 return;
423
424 bzero(&uh, sizeof(uh));
425 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
426
427 (void) in6_pcbnotify(&V_udbinfo, sa, uh.uh_dport,
428 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd,
429 cmdarg, notify);
430 } else
431 (void) in6_pcbnotify(&V_udbinfo, sa, 0,
432 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
433 }
434
435 static int
436 udp6_getcred(SYSCTL_HANDLER_ARGS)
437 {
438 INIT_VNET_INET(curvnet);
439 INIT_VNET_INET6(curvnet);
440 struct xucred xuc;
441 struct sockaddr_in6 addrs[2];
442 struct inpcb *inp;
443 int error;
444
445 error = priv_check(req->td, PRIV_NETINET_GETCRED);
446 if (error)
447 return (error);
448
449 if (req->newlen != sizeof(addrs))
450 return (EINVAL);
451 if (req->oldlen != sizeof(struct xucred))
452 return (EINVAL);
453 error = SYSCTL_IN(req, addrs, sizeof(addrs));
454 if (error)
455 return (error);
456 if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 ||
457 (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) {
458 return (error);
459 }
460 INP_INFO_RLOCK(&V_udbinfo);
461 inp = in6_pcblookup_hash(&V_udbinfo, &addrs[1].sin6_addr,
462 addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port, 1,
463 NULL);
464 if (inp != NULL) {
465 INP_RLOCK(inp);
466 INP_INFO_RUNLOCK(&V_udbinfo);
467 if (inp->inp_socket == NULL)
468 error = ENOENT;
469 if (error == 0)
470 error = cr_canseesocket(req->td->td_ucred,
471 inp->inp_socket);
472 if (error == 0)
473 cru2x(inp->inp_cred, &xuc);
474 INP_RUNLOCK(inp);
475 } else {
476 INP_INFO_RUNLOCK(&V_udbinfo);
477 error = ENOENT;
478 }
479 if (error == 0)
480 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
481 return (error);
482 }
483
484 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0,
485 0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection");
486
487 static int
488 udp6_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr6,
489 struct mbuf *control, struct thread *td)
490 {
491 INIT_VNET_INET(curvnet);
492 INIT_VNET_INET6(curvnet);
493 u_int32_t ulen = m->m_pkthdr.len;
494 u_int32_t plen = sizeof(struct udphdr) + ulen;
495 struct ip6_hdr *ip6;
496 struct udphdr *udp6;
497 struct in6_addr *laddr, *faddr;
498 struct sockaddr_in6 *sin6 = NULL;
499 struct ifnet *oifp = NULL;
500 int scope_ambiguous = 0;
501 u_short fport;
502 int error = 0;
503 struct ip6_pktopts *optp, opt;
504 int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
505 int flags;
506 struct sockaddr_in6 tmp;
507
508 INP_WLOCK_ASSERT(inp);
509
510 if (addr6) {
511 /* addr6 has been validated in udp6_send(). */
512 sin6 = (struct sockaddr_in6 *)addr6;
513
514 /* protect *sin6 from overwrites */
515 tmp = *sin6;
516 sin6 = &tmp;
517
518 /*
519 * Application should provide a proper zone ID or the use of
520 * default zone IDs should be enabled. Unfortunately, some
521 * applications do not behave as it should, so we need a
522 * workaround. Even if an appropriate ID is not determined,
523 * we'll see if we can determine the outgoing interface. If we
524 * can, determine the zone ID based on the interface below.
525 */
526 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone)
527 scope_ambiguous = 1;
528 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
529 return (error);
530 }
531
532 if (control) {
533 if ((error = ip6_setpktopts(control, &opt,
534 inp->in6p_outputopts, td->td_ucred, IPPROTO_UDP)) != 0)
535 goto release;
536 optp = &opt;
537 } else
538 optp = inp->in6p_outputopts;
539
540 if (sin6) {
541 faddr = &sin6->sin6_addr;
542
543 /*
544 * IPv4 version of udp_output calls in_pcbconnect in this case,
545 * which needs splnet and affects performance.
546 * Since we saw no essential reason for calling in_pcbconnect,
547 * we get rid of such kind of logic, and call in6_selectsrc
548 * and in6_pcbsetport in order to fill in the local address
549 * and the local port.
550 */
551 if (sin6->sin6_port == 0) {
552 error = EADDRNOTAVAIL;
553 goto release;
554 }
555
556 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
557 /* how about ::ffff:0.0.0.0 case? */
558 error = EISCONN;
559 goto release;
560 }
561
562 fport = sin6->sin6_port; /* allow 0 port */
563
564 if (IN6_IS_ADDR_V4MAPPED(faddr)) {
565 if ((inp->in6p_flags & IN6P_IPV6_V6ONLY)) {
566 /*
567 * I believe we should explicitly discard the
568 * packet when mapped addresses are disabled,
569 * rather than send the packet as an IPv6 one.
570 * If we chose the latter approach, the packet
571 * might be sent out on the wire based on the
572 * default route, the situation which we'd
573 * probably want to avoid.
574 * (20010421 jinmei@kame.net)
575 */
576 error = EINVAL;
577 goto release;
578 }
579 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
580 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) {
581 /*
582 * when remote addr is an IPv4-mapped address,
583 * local addr should not be an IPv6 address,
584 * since you cannot determine how to map IPv6
585 * source address to IPv4.
586 */
587 error = EINVAL;
588 goto release;
589 }
590
591 af = AF_INET;
592 }
593
594 if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
595 laddr = in6_selectsrc(sin6, optp, inp, NULL,
596 td->td_ucred, &oifp, &error);
597 if (oifp && scope_ambiguous &&
598 (error = in6_setscope(&sin6->sin6_addr,
599 oifp, NULL))) {
600 goto release;
601 }
602 } else
603 laddr = &inp->in6p_laddr; /* XXX */
604 if (laddr == NULL) {
605 if (error == 0)
606 error = EADDRNOTAVAIL;
607 goto release;
608 }
609 if (inp->in6p_lport == 0 &&
610 (error = in6_pcbsetport(laddr, inp, td->td_ucred)) != 0)
611 goto release;
612 } else {
613 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
614 error = ENOTCONN;
615 goto release;
616 }
617 if (IN6_IS_ADDR_V4MAPPED(&inp->in6p_faddr)) {
618 if ((inp->in6p_flags & IN6P_IPV6_V6ONLY)) {
619 /*
620 * XXX: this case would happen when the
621 * application sets the V6ONLY flag after
622 * connecting the foreign address.
623 * Such applications should be fixed,
624 * so we bark here.
625 */
626 log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
627 "option was set for a connected socket\n");
628 error = EINVAL;
629 goto release;
630 } else
631 af = AF_INET;
632 }
633 laddr = &inp->in6p_laddr;
634 faddr = &inp->in6p_faddr;
635 fport = inp->in6p_fport;
636 }
637
638 if (af == AF_INET)
639 hlen = sizeof(struct ip);
640
641 /*
642 * Calculate data length and get a mbuf
643 * for UDP and IP6 headers.
644 */
645 M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT);
646 if (m == 0) {
647 error = ENOBUFS;
648 goto release;
649 }
650
651 /*
652 * Stuff checksum and output datagram.
653 */
654 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
655 udp6->uh_sport = inp->in6p_lport; /* lport is always set in the PCB */
656 udp6->uh_dport = fport;
657 if (plen <= 0xffff)
658 udp6->uh_ulen = htons((u_short)plen);
659 else
660 udp6->uh_ulen = 0;
661 udp6->uh_sum = 0;
662
663 switch (af) {
664 case AF_INET6:
665 ip6 = mtod(m, struct ip6_hdr *);
666 ip6->ip6_flow = inp->in6p_flowinfo & IPV6_FLOWINFO_MASK;
667 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
668 ip6->ip6_vfc |= IPV6_VERSION;
669 #if 0 /* ip6_plen will be filled in ip6_output. */
670 ip6->ip6_plen = htons((u_short)plen);
671 #endif
672 ip6->ip6_nxt = IPPROTO_UDP;
673 ip6->ip6_hlim = in6_selecthlim(inp, NULL);
674 ip6->ip6_src = *laddr;
675 ip6->ip6_dst = *faddr;
676
677 if ((udp6->uh_sum = in6_cksum(m, IPPROTO_UDP,
678 sizeof(struct ip6_hdr), plen)) == 0) {
679 udp6->uh_sum = 0xffff;
680 }
681
682 flags = 0;
683
684 V_udpstat.udps_opackets++;
685 error = ip6_output(m, optp, NULL, flags, inp->in6p_moptions,
686 NULL, inp);
687 break;
688 case AF_INET:
689 error = EAFNOSUPPORT;
690 goto release;
691 }
692 goto releaseopt;
693
694 release:
695 m_freem(m);
696
697 releaseopt:
698 if (control) {
699 ip6_clearpktopts(&opt, -1);
700 m_freem(control);
701 }
702 return (error);
703 }
704
705 static void
706 udp6_abort(struct socket *so)
707 {
708 INIT_VNET_INET(so->so_vnet);
709 struct inpcb *inp;
710
711 inp = sotoinpcb(so);
712 KASSERT(inp != NULL, ("udp6_abort: inp == NULL"));
713
714 #ifdef INET
715 if (inp->inp_vflag & INP_IPV4) {
716 struct pr_usrreqs *pru;
717
718 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
719 (*pru->pru_abort)(so);
720 return;
721 }
722 #endif
723
724 INP_INFO_WLOCK(&V_udbinfo);
725 INP_WLOCK(inp);
726 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
727 in6_pcbdisconnect(inp);
728 inp->in6p_laddr = in6addr_any;
729 soisdisconnected(so);
730 }
731 INP_WUNLOCK(inp);
732 INP_INFO_WUNLOCK(&V_udbinfo);
733 }
734
735 static int
736 udp6_attach(struct socket *so, int proto, struct thread *td)
737 {
738 INIT_VNET_INET(so->so_vnet);
739 struct inpcb *inp;
740 int error;
741
742 inp = sotoinpcb(so);
743 KASSERT(inp == NULL, ("udp6_attach: inp != NULL"));
744
745 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
746 error = soreserve(so, udp_sendspace, udp_recvspace);
747 if (error)
748 return (error);
749 }
750 INP_INFO_WLOCK(&V_udbinfo);
751 error = in_pcballoc(so, &V_udbinfo);
752 if (error) {
753 INP_INFO_WUNLOCK(&V_udbinfo);
754 return (error);
755 }
756 inp = (struct inpcb *)so->so_pcb;
757 INP_INFO_WUNLOCK(&V_udbinfo);
758 inp->inp_vflag |= INP_IPV6;
759 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
760 inp->inp_vflag |= INP_IPV4;
761 inp->in6p_hops = -1; /* use kernel default */
762 inp->in6p_cksum = -1; /* just to be sure */
763 /*
764 * XXX: ugly!!
765 * IPv4 TTL initialization is necessary for an IPv6 socket as well,
766 * because the socket may be bound to an IPv6 wildcard address,
767 * which may match an IPv4-mapped IPv6 address.
768 */
769 inp->inp_ip_ttl = V_ip_defttl;
770 INP_WUNLOCK(inp);
771 return (0);
772 }
773
774 static int
775 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
776 {
777 INIT_VNET_INET(so->so_vnet);
778 struct inpcb *inp;
779 int error;
780
781 inp = sotoinpcb(so);
782 KASSERT(inp != NULL, ("udp6_bind: inp == NULL"));
783
784 INP_INFO_WLOCK(&V_udbinfo);
785 INP_WLOCK(inp);
786 inp->inp_vflag &= ~INP_IPV4;
787 inp->inp_vflag |= INP_IPV6;
788 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
789 struct sockaddr_in6 *sin6_p;
790
791 sin6_p = (struct sockaddr_in6 *)nam;
792
793 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
794 inp->inp_vflag |= INP_IPV4;
795 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
796 struct sockaddr_in sin;
797
798 in6_sin6_2_sin(&sin, sin6_p);
799 inp->inp_vflag |= INP_IPV4;
800 inp->inp_vflag &= ~INP_IPV6;
801 error = in_pcbbind(inp, (struct sockaddr *)&sin,
802 td->td_ucred);
803 goto out;
804 }
805 }
806
807 error = in6_pcbbind(inp, nam, td->td_ucred);
808 out:
809 INP_WUNLOCK(inp);
810 INP_INFO_WUNLOCK(&V_udbinfo);
811 return (error);
812 }
813
814 static void
815 udp6_close(struct socket *so)
816 {
817 INIT_VNET_INET(so->so_vnet);
818 struct inpcb *inp;
819
820 inp = sotoinpcb(so);
821 KASSERT(inp != NULL, ("udp6_close: inp == NULL"));
822
823 #ifdef INET
824 if (inp->inp_vflag & INP_IPV4) {
825 struct pr_usrreqs *pru;
826
827 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
828 (*pru->pru_disconnect)(so);
829 return;
830 }
831 #endif
832 INP_INFO_WLOCK(&V_udbinfo);
833 INP_WLOCK(inp);
834 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
835 in6_pcbdisconnect(inp);
836 inp->in6p_laddr = in6addr_any;
837 soisdisconnected(so);
838 }
839 INP_WUNLOCK(inp);
840 INP_INFO_WUNLOCK(&V_udbinfo);
841 }
842
843 static int
844 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
845 {
846 INIT_VNET_INET(so->so_vnet);
847 struct inpcb *inp;
848 int error;
849
850 inp = sotoinpcb(so);
851 KASSERT(inp != NULL, ("udp6_connect: inp == NULL"));
852
853 INP_INFO_WLOCK(&V_udbinfo);
854 INP_WLOCK(inp);
855 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
856 struct sockaddr_in6 *sin6_p;
857
858 sin6_p = (struct sockaddr_in6 *)nam;
859 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
860 struct sockaddr_in sin;
861
862 if (inp->inp_faddr.s_addr != INADDR_ANY) {
863 error = EISCONN;
864 goto out;
865 }
866 in6_sin6_2_sin(&sin, sin6_p);
867 if (td && jailed(td->td_ucred))
868 if (prison_remote_ip4(td->td_ucred,
869 &sin.sin_addr) != 0) {
870 error = EAFNOSUPPORT;
871 goto out;
872 }
873 error = in_pcbconnect(inp, (struct sockaddr *)&sin,
874 td->td_ucred);
875 if (error == 0) {
876 inp->inp_vflag |= INP_IPV4;
877 inp->inp_vflag &= ~INP_IPV6;
878 soisconnected(so);
879 }
880 goto out;
881 }
882 }
883 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
884 error = EISCONN;
885 goto out;
886 }
887 if (td && jailed(td->td_ucred)) {
888 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
889 if (prison_remote_ip6(td->td_ucred, &sin6->sin6_addr) != 0) {
890 error = EAFNOSUPPORT;
891 goto out;
892 }
893 }
894 error = in6_pcbconnect(inp, nam, td->td_ucred);
895 if (error == 0) {
896 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
897 /* should be non mapped addr */
898 inp->inp_vflag &= ~INP_IPV4;
899 inp->inp_vflag |= INP_IPV6;
900 }
901 soisconnected(so);
902 }
903 out:
904 INP_WUNLOCK(inp);
905 INP_INFO_WUNLOCK(&V_udbinfo);
906 return (error);
907 }
908
909 static void
910 udp6_detach(struct socket *so)
911 {
912 INIT_VNET_INET(so->so_vnet);
913 struct inpcb *inp;
914
915 inp = sotoinpcb(so);
916 KASSERT(inp != NULL, ("udp6_detach: inp == NULL"));
917
918 INP_INFO_WLOCK(&V_udbinfo);
919 INP_WLOCK(inp);
920 in_pcbdetach(inp);
921 in_pcbfree(inp);
922 INP_INFO_WUNLOCK(&V_udbinfo);
923 }
924
925 static int
926 udp6_disconnect(struct socket *so)
927 {
928 INIT_VNET_INET(so->so_vnet);
929 struct inpcb *inp;
930 int error;
931
932 inp = sotoinpcb(so);
933 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL"));
934
935 INP_INFO_WLOCK(&V_udbinfo);
936 INP_WLOCK(inp);
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