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: releng/7.4/sys/netinet6/udp6_usrreq.c 202914 2010-01-24 10:08:54Z bz $");
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
89 #include <net/if.h>
90 #include <net/if_types.h>
91 #include <net/route.h>
92
93 #include <netinet/in.h>
94 #include <netinet/in_pcb.h>
95 #include <netinet/in_systm.h>
96 #include <netinet/in_var.h>
97 #include <netinet/ip.h>
98 #include <netinet/ip_icmp.h>
99 #include <netinet/ip6.h>
100 #include <netinet/icmp_var.h>
101 #include <netinet/icmp6.h>
102 #include <netinet/ip_var.h>
103 #include <netinet/udp.h>
104 #include <netinet/udp_var.h>
105 #include <netinet6/ip6protosw.h>
106 #include <netinet6/ip6_var.h>
107 #include <netinet6/in6_pcb.h>
108 #include <netinet6/udp6_var.h>
109 #include <netinet6/scope6_var.h>
110
111 #ifdef IPSEC
112 #include <netipsec/ipsec.h>
113 #include <netipsec/ipsec6.h>
114 #endif /* IPSEC */
115
116 #include <security/mac/mac_framework.h>
117
118 /*
119 * UDP protocol implementation.
120 * Per RFC 768, August, 1980.
121 */
122
123 extern struct protosw inetsw[];
124 static void udp6_detach(struct socket *so);
125
126 static void
127 udp6_append(struct inpcb *inp, struct mbuf *n, int off,
128 struct sockaddr_in6 *fromsa)
129 {
130 struct socket *so;
131 struct mbuf *opts;
132
133 INP_LOCK_ASSERT(inp);
134
135 #ifdef IPSEC
136 /* Check AH/ESP integrity. */
137 if (ipsec6_in_reject(n, inp)) {
138 m_freem(n);
139 ipsec6stat.in_polvio++;
140 return;
141 }
142 #endif /* IPSEC */
143 #ifdef MAC
144 if (mac_check_inpcb_deliver(inp, n) != 0) {
145 m_freem(n);
146 return;
147 }
148 #endif
149 opts = NULL;
150 if (inp->inp_flags & INP_CONTROLOPTS ||
151 inp->inp_socket->so_options & SO_TIMESTAMP)
152 ip6_savecontrol(inp, n, &opts);
153 m_adj(n, off + sizeof(struct udphdr));
154
155 so = inp->inp_socket;
156 SOCKBUF_LOCK(&so->so_rcv);
157 if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)fromsa, n,
158 opts) == 0) {
159 SOCKBUF_UNLOCK(&so->so_rcv);
160 m_freem(n);
161 if (opts)
162 m_freem(opts);
163 udpstat.udps_fullsock++;
164 } else
165 sorwakeup_locked(so);
166 }
167
168 int
169 udp6_input(struct mbuf **mp, int *offp, int proto)
170 {
171 struct mbuf *m = *mp;
172 struct ip6_hdr *ip6;
173 struct udphdr *uh;
174 struct inpcb *inp;
175 int off = *offp;
176 int plen, ulen;
177 struct sockaddr_in6 fromsa;
178
179 ip6 = mtod(m, struct ip6_hdr *);
180
181 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
182 /* XXX send icmp6 host/port unreach? */
183 m_freem(m);
184 return (IPPROTO_DONE);
185 }
186
187 #ifndef PULLDOWN_TEST
188 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
189 ip6 = mtod(m, struct ip6_hdr *);
190 uh = (struct udphdr *)((caddr_t)ip6 + off);
191 #else
192 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh));
193 if (!uh)
194 return (IPPROTO_DONE);
195 #endif
196
197 udpstat.udps_ipackets++;
198
199 /*
200 * Destination port of 0 is illegal, based on RFC768.
201 */
202 if (uh->uh_dport == 0)
203 goto badunlocked;
204
205 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
206 ulen = ntohs((u_short)uh->uh_ulen);
207
208 if (plen != ulen) {
209 udpstat.udps_badlen++;
210 goto badunlocked;
211 }
212
213 /*
214 * Checksum extended UDP header and data.
215 */
216 if (uh->uh_sum == 0) {
217 udpstat.udps_nosum++;
218 goto badunlocked;
219 }
220 if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
221 udpstat.udps_badsum++;
222 goto badunlocked;
223 }
224
225 /*
226 * Construct sockaddr format source address.
227 */
228 init_sin6(&fromsa, m);
229 fromsa.sin6_port = uh->uh_sport;
230
231 INP_INFO_RLOCK(&udbinfo);
232 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
233 struct inpcb *last;
234
235 /*
236 * In the event that laddr should be set to the link-local
237 * address (this happens in RIPng), the multicast address
238 * specified in the received packet will not match laddr. To
239 * handle this situation, matching is relaxed if the
240 * receiving interface is the same as one specified in the
241 * socket and if the destination multicast address matches
242 * one of the multicast groups specified in the socket.
243 */
244
245 /*
246 * KAME note: traditionally we dropped udpiphdr from mbuf
247 * here. We need udphdr for IPsec processing so we do that
248 * later.
249 */
250 last = NULL;
251 LIST_FOREACH(inp, &udb, inp_list) {
252 if ((inp->inp_vflag & INP_IPV6) == 0)
253 continue;
254 if (inp->inp_lport != uh->uh_dport)
255 continue;
256 /*
257 * XXX: Do not check source port of incoming datagram
258 * unless inp_connect() has been called to bind the
259 * fport part of the 4-tuple; the source could be
260 * trying to talk to us with an ephemeral port.
261 */
262 if (inp->inp_fport != 0 &&
263 inp->inp_fport != uh->uh_sport)
264 continue;
265 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
266 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
267 &ip6->ip6_dst))
268 continue;
269 }
270 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
271 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
272 &ip6->ip6_src) ||
273 inp->inp_fport != uh->uh_sport)
274 continue;
275 }
276
277 if (last != NULL) {
278 struct mbuf *n;
279
280 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
281 INP_RLOCK(last);
282 udp6_append(last, n, off, &fromsa);
283 INP_RUNLOCK(last);
284 }
285 }
286 last = inp;
287 /*
288 * Don't look for additional matches if this one does
289 * not have either the SO_REUSEPORT or SO_REUSEADDR
290 * socket options set. This heuristic avoids
291 * searching through all pcbs in the common case of a
292 * non-shared port. It assumes that an application
293 * will never clear these options after setting them.
294 */
295 if ((last->inp_socket->so_options &
296 (SO_REUSEPORT|SO_REUSEADDR)) == 0)
297 break;
298 }
299
300 if (last == NULL) {
301 /*
302 * No matching pcb found; discard datagram. (No need
303 * to send an ICMP Port Unreachable for a broadcast
304 * or multicast datgram.)
305 */
306 udpstat.udps_noport++;
307 udpstat.udps_noportmcast++;
308 goto badheadlocked;
309 }
310 INP_RLOCK(last);
311 INP_INFO_RUNLOCK(&udbinfo);
312 udp6_append(last, m, off, &fromsa);
313 INP_RUNLOCK(last);
314 return (IPPROTO_DONE);
315 }
316 /*
317 * Locate pcb for datagram.
318 */
319 inp = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport,
320 &ip6->ip6_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif);
321 if (inp == NULL) {
322 if (udp_log_in_vain) {
323 char ip6bufs[INET6_ADDRSTRLEN];
324 char ip6bufd[INET6_ADDRSTRLEN];
325
326 log(LOG_INFO,
327 "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
328 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
329 ntohs(uh->uh_dport),
330 ip6_sprintf(ip6bufs, &ip6->ip6_src),
331 ntohs(uh->uh_sport));
332 }
333 udpstat.udps_noport++;
334 if (m->m_flags & M_MCAST) {
335 printf("UDP6: M_MCAST is set in a unicast packet.\n");
336 udpstat.udps_noportmcast++;
337 goto badheadlocked;
338 }
339 INP_INFO_RUNLOCK(&udbinfo);
340 if (udp_blackhole)
341 goto badunlocked;
342 if (badport_bandlim(BANDLIM_ICMP6_UNREACH) < 0)
343 goto badunlocked;
344 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
345 return (IPPROTO_DONE);
346 }
347 INP_RLOCK(inp);
348 INP_INFO_RUNLOCK(&udbinfo);
349 udp6_append(inp, m, off, &fromsa);
350 INP_RUNLOCK(inp);
351 return (IPPROTO_DONE);
352
353 badheadlocked:
354 INP_INFO_RUNLOCK(&udbinfo);
355 badunlocked:
356 if (m)
357 m_freem(m);
358 return (IPPROTO_DONE);
359 }
360
361 void
362 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
363 {
364 struct udphdr uh;
365 struct ip6_hdr *ip6;
366 struct mbuf *m;
367 int off = 0;
368 struct ip6ctlparam *ip6cp = NULL;
369 const struct sockaddr_in6 *sa6_src = NULL;
370 void *cmdarg;
371 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify;
372 struct udp_portonly {
373 u_int16_t uh_sport;
374 u_int16_t uh_dport;
375 } *uhp;
376
377 if (sa->sa_family != AF_INET6 ||
378 sa->sa_len != sizeof(struct sockaddr_in6))
379 return;
380
381 if ((unsigned)cmd >= PRC_NCMDS)
382 return;
383 if (PRC_IS_REDIRECT(cmd))
384 notify = in6_rtchange, d = NULL;
385 else if (cmd == PRC_HOSTDEAD)
386 d = NULL;
387 else if (inet6ctlerrmap[cmd] == 0)
388 return;
389
390 /* if the parameter is from icmp6, decode it. */
391 if (d != NULL) {
392 ip6cp = (struct ip6ctlparam *)d;
393 m = ip6cp->ip6c_m;
394 ip6 = ip6cp->ip6c_ip6;
395 off = ip6cp->ip6c_off;
396 cmdarg = ip6cp->ip6c_cmdarg;
397 sa6_src = ip6cp->ip6c_src;
398 } else {
399 m = NULL;
400 ip6 = NULL;
401 cmdarg = NULL;
402 sa6_src = &sa6_any;
403 }
404
405 if (ip6) {
406 /*
407 * XXX: We assume that when IPV6 is non NULL,
408 * M and OFF are valid.
409 */
410
411 /* Check if we can safely examine src and dst ports. */
412 if (m->m_pkthdr.len < off + sizeof(*uhp))
413 return;
414
415 bzero(&uh, sizeof(uh));
416 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
417
418 (void) in6_pcbnotify(&udbinfo, sa, uh.uh_dport,
419 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd,
420 cmdarg, notify);
421 } else
422 (void) in6_pcbnotify(&udbinfo, sa, 0,
423 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
424 }
425
426 static int
427 udp6_getcred(SYSCTL_HANDLER_ARGS)
428 {
429 struct xucred xuc;
430 struct sockaddr_in6 addrs[2];
431 struct inpcb *inp;
432 int error;
433
434 error = priv_check(req->td, PRIV_NETINET_GETCRED);
435 if (error)
436 return (error);
437
438 if (req->newlen != sizeof(addrs))
439 return (EINVAL);
440 if (req->oldlen != sizeof(struct xucred))
441 return (EINVAL);
442 error = SYSCTL_IN(req, addrs, sizeof(addrs));
443 if (error)
444 return (error);
445 if ((error = sa6_embedscope(&addrs[0], ip6_use_defzone)) != 0 ||
446 (error = sa6_embedscope(&addrs[1], ip6_use_defzone)) != 0) {
447 return (error);
448 }
449 INP_INFO_RLOCK(&udbinfo);
450 inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr,
451 addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port, 1,
452 NULL);
453 if (inp != NULL) {
454 INP_RLOCK(inp);
455 INP_INFO_RUNLOCK(&udbinfo);
456 if (inp->inp_socket == NULL)
457 error = ENOENT;
458 if (error == 0)
459 error = cr_canseesocket(req->td->td_ucred,
460 inp->inp_socket);
461 if (error == 0)
462 cru2x(inp->inp_cred, &xuc);
463 INP_RUNLOCK(inp);
464 } else {
465 INP_INFO_RUNLOCK(&udbinfo);
466 error = ENOENT;
467 }
468 if (error == 0)
469 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
470 return (error);
471 }
472
473 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0,
474 0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection");
475
476 static int
477 udp6_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr6,
478 struct mbuf *control, struct thread *td)
479 {
480 u_int32_t ulen = m->m_pkthdr.len;
481 u_int32_t plen = sizeof(struct udphdr) + ulen;
482 struct ip6_hdr *ip6;
483 struct udphdr *udp6;
484 struct in6_addr *laddr, *faddr, in6a;
485 struct sockaddr_in6 *sin6 = NULL;
486 struct ifnet *oifp = NULL;
487 int scope_ambiguous = 0;
488 u_short fport;
489 int error = 0;
490 struct ip6_pktopts *optp, opt;
491 int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
492 int flags;
493 struct sockaddr_in6 tmp;
494
495 INP_WLOCK_ASSERT(inp);
496
497 if (addr6) {
498 /* addr6 has been validated in udp6_send(). */
499 sin6 = (struct sockaddr_in6 *)addr6;
500
501 /* protect *sin6 from overwrites */
502 tmp = *sin6;
503 sin6 = &tmp;
504
505 /*
506 * Application should provide a proper zone ID or the use of
507 * default zone IDs should be enabled. Unfortunately, some
508 * applications do not behave as it should, so we need a
509 * workaround. Even if an appropriate ID is not determined,
510 * we'll see if we can determine the outgoing interface. If we
511 * can, determine the zone ID based on the interface below.
512 */
513 if (sin6->sin6_scope_id == 0 && !ip6_use_defzone)
514 scope_ambiguous = 1;
515 if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0)
516 return (error);
517 }
518
519 if (control) {
520 if ((error = ip6_setpktopts(control, &opt,
521 inp->in6p_outputopts, td->td_ucred, IPPROTO_UDP)) != 0)
522 goto release;
523 optp = &opt;
524 } else
525 optp = inp->in6p_outputopts;
526
527 if (sin6) {
528 faddr = &sin6->sin6_addr;
529
530 /*
531 * IPv4 version of udp_output calls in_pcbconnect in this case,
532 * which needs splnet and affects performance.
533 * Since we saw no essential reason for calling in_pcbconnect,
534 * we get rid of such kind of logic, and call in6_selectsrc
535 * and in6_pcbsetport in order to fill in the local address
536 * and the local port.
537 */
538 if (sin6->sin6_port == 0) {
539 error = EADDRNOTAVAIL;
540 goto release;
541 }
542
543 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
544 /* how about ::ffff:0.0.0.0 case? */
545 error = EISCONN;
546 goto release;
547 }
548
549 fport = sin6->sin6_port; /* allow 0 port */
550
551 if (IN6_IS_ADDR_V4MAPPED(faddr)) {
552 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
553 /*
554 * I believe we should explicitly discard the
555 * packet when mapped addresses are disabled,
556 * rather than send the packet as an IPv6 one.
557 * If we chose the latter approach, the packet
558 * might be sent out on the wire based on the
559 * default route, the situation which we'd
560 * probably want to avoid.
561 * (20010421 jinmei@kame.net)
562 */
563 error = EINVAL;
564 goto release;
565 }
566 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
567 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) {
568 /*
569 * when remote addr is an IPv4-mapped address,
570 * local addr should not be an IPv6 address,
571 * since you cannot determine how to map IPv6
572 * source address to IPv4.
573 */
574 error = EINVAL;
575 goto release;
576 }
577
578 af = AF_INET;
579 }
580
581 if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
582 error = in6_selectsrc(sin6, optp, inp, NULL,
583 td->td_ucred, &oifp, &in6a);
584 if (error)
585 goto release;
586 if (oifp && scope_ambiguous &&
587 (error = in6_setscope(&sin6->sin6_addr,
588 oifp, NULL))) {
589 goto release;
590 }
591 laddr = &in6a;
592 } else
593 laddr = &inp->in6p_laddr; /* XXX */
594 if (laddr == NULL) {
595 if (error == 0)
596 error = EADDRNOTAVAIL;
597 goto release;
598 }
599 if (inp->inp_lport == 0 &&
600 (error = in6_pcbsetport(laddr, inp, td->td_ucred)) != 0)
601 goto release;
602 } else {
603 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
604 error = ENOTCONN;
605 goto release;
606 }
607 if (IN6_IS_ADDR_V4MAPPED(&inp->in6p_faddr)) {
608 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
609 /*
610 * XXX: this case would happen when the
611 * application sets the V6ONLY flag after
612 * connecting the foreign address.
613 * Such applications should be fixed,
614 * so we bark here.
615 */
616 log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
617 "option was set for a connected socket\n");
618 error = EINVAL;
619 goto release;
620 } else
621 af = AF_INET;
622 }
623 laddr = &inp->in6p_laddr;
624 faddr = &inp->in6p_faddr;
625 fport = inp->inp_fport;
626 }
627
628 if (af == AF_INET)
629 hlen = sizeof(struct ip);
630
631 /*
632 * Calculate data length and get a mbuf
633 * for UDP and IP6 headers.
634 */
635 M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT);
636 if (m == 0) {
637 error = ENOBUFS;
638 goto release;
639 }
640
641 /*
642 * Stuff checksum and output datagram.
643 */
644 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
645 udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */
646 udp6->uh_dport = fport;
647 if (plen <= 0xffff)
648 udp6->uh_ulen = htons((u_short)plen);
649 else
650 udp6->uh_ulen = 0;
651 udp6->uh_sum = 0;
652
653 switch (af) {
654 case AF_INET6:
655 ip6 = mtod(m, struct ip6_hdr *);
656 ip6->ip6_flow = inp->inp_flow & IPV6_FLOWINFO_MASK;
657 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
658 ip6->ip6_vfc |= IPV6_VERSION;
659 #if 0 /* ip6_plen will be filled in ip6_output. */
660 ip6->ip6_plen = htons((u_short)plen);
661 #endif
662 ip6->ip6_nxt = IPPROTO_UDP;
663 ip6->ip6_hlim = in6_selecthlim(inp, NULL);
664 ip6->ip6_src = *laddr;
665 ip6->ip6_dst = *faddr;
666
667 if ((udp6->uh_sum = in6_cksum(m, IPPROTO_UDP,
668 sizeof(struct ip6_hdr), plen)) == 0) {
669 udp6->uh_sum = 0xffff;
670 }
671
672 flags = 0;
673
674 udpstat.udps_opackets++;
675 error = ip6_output(m, optp, NULL, flags, inp->in6p_moptions,
676 NULL, inp);
677 break;
678 case AF_INET:
679 error = EAFNOSUPPORT;
680 goto release;
681 }
682 goto releaseopt;
683
684 release:
685 m_freem(m);
686
687 releaseopt:
688 if (control) {
689 ip6_clearpktopts(&opt, -1);
690 m_freem(control);
691 }
692 return (error);
693 }
694
695 static void
696 udp6_abort(struct socket *so)
697 {
698 struct inpcb *inp;
699
700 inp = sotoinpcb(so);
701 KASSERT(inp != NULL, ("udp6_abort: inp == NULL"));
702
703 #ifdef INET
704 if (inp->inp_vflag & INP_IPV4) {
705 struct pr_usrreqs *pru;
706
707 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
708 (*pru->pru_abort)(so);
709 return;
710 }
711 #endif
712
713 INP_INFO_WLOCK(&udbinfo);
714 INP_WLOCK(inp);
715 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
716 in6_pcbdisconnect(inp);
717 inp->in6p_laddr = in6addr_any;
718 soisdisconnected(so);
719 }
720 INP_WUNLOCK(inp);
721 INP_INFO_WUNLOCK(&udbinfo);
722 }
723
724 static int
725 udp6_attach(struct socket *so, int proto, struct thread *td)
726 {
727 struct inpcb *inp;
728 int error;
729
730 inp = sotoinpcb(so);
731 KASSERT(inp == NULL, ("udp6_attach: inp != NULL"));
732
733 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
734 error = soreserve(so, udp_sendspace, udp_recvspace);
735 if (error)
736 return (error);
737 }
738 INP_INFO_WLOCK(&udbinfo);
739 error = in_pcballoc(so, &udbinfo);
740 if (error) {
741 INP_INFO_WUNLOCK(&udbinfo);
742 return (error);
743 }
744 inp = (struct inpcb *)so->so_pcb;
745 inp->inp_vflag |= INP_IPV6;
746 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
747 inp->inp_vflag |= INP_IPV4;
748 inp->in6p_hops = -1; /* use kernel default */
749 inp->in6p_cksum = -1; /* just to be sure */
750 /*
751 * XXX: ugly!!
752 * IPv4 TTL initialization is necessary for an IPv6 socket as well,
753 * because the socket may be bound to an IPv6 wildcard address,
754 * which may match an IPv4-mapped IPv6 address.
755 */
756 inp->inp_ip_ttl = ip_defttl;
757
758 error = udp_newudpcb(inp);
759 if (error) {
760 in_pcbdetach(inp);
761 in_pcbfree(inp);
762 INP_INFO_WUNLOCK(&udbinfo);
763 return (error);
764 }
765 INP_WUNLOCK(inp);
766 INP_INFO_WUNLOCK(&udbinfo);
767 return (0);
768 }
769
770 static int
771 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
772 {
773 struct inpcb *inp;
774 int error;
775
776 inp = sotoinpcb(so);
777 KASSERT(inp != NULL, ("udp6_bind: inp == NULL"));
778
779 INP_INFO_WLOCK(&udbinfo);
780 INP_WLOCK(inp);
781 inp->inp_vflag &= ~INP_IPV4;
782 inp->inp_vflag |= INP_IPV6;
783 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
784 struct sockaddr_in6 *sin6_p;
785
786 sin6_p = (struct sockaddr_in6 *)nam;
787
788 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
789 inp->inp_vflag |= INP_IPV4;
790 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
791 struct sockaddr_in sin;
792
793 in6_sin6_2_sin(&sin, sin6_p);
794 inp->inp_vflag |= INP_IPV4;
795 inp->inp_vflag &= ~INP_IPV6;
796 error = in_pcbbind(inp, (struct sockaddr *)&sin,
797 td->td_ucred);
798 goto out;
799 }
800 }
801
802 error = in6_pcbbind(inp, nam, td->td_ucred);
803 out:
804 INP_WUNLOCK(inp);
805 INP_INFO_WUNLOCK(&udbinfo);
806 return (error);
807 }
808
809 static void
810 udp6_close(struct socket *so)
811 {
812 struct inpcb *inp;
813
814 inp = sotoinpcb(so);
815 KASSERT(inp != NULL, ("udp6_close: inp == NULL"));
816
817 #ifdef INET
818 if (inp->inp_vflag & INP_IPV4) {
819 struct pr_usrreqs *pru;
820
821 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
822 (*pru->pru_disconnect)(so);
823 return;
824 }
825 #endif
826 INP_INFO_WLOCK(&udbinfo);
827 INP_WLOCK(inp);
828 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
829 in6_pcbdisconnect(inp);
830 inp->in6p_laddr = in6addr_any;
831 soisdisconnected(so);
832 }
833 INP_WUNLOCK(inp);
834 INP_INFO_WUNLOCK(&udbinfo);
835 }
836
837 static int
838 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
839 {
840 struct inpcb *inp;
841 struct sockaddr_in6 *sin6;
842 int error;
843
844 inp = sotoinpcb(so);
845 sin6 = (struct sockaddr_in6 *)nam;
846 KASSERT(inp != NULL, ("udp6_connect: inp == NULL"));
847
848 INP_INFO_WLOCK(&udbinfo);
849 INP_WLOCK(inp);
850 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
851 IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
852 struct sockaddr_in sin;
853
854 if (inp->inp_faddr.s_addr != INADDR_ANY) {
855 error = EISCONN;
856 goto out;
857 }
858 in6_sin6_2_sin(&sin, sin6);
859 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr);
860 if (error != 0)
861 goto out;
862 error = in_pcbconnect(inp, (struct sockaddr *)&sin,
863 td->td_ucred);
864 if (error == 0) {
865 inp->inp_vflag |= INP_IPV4;
866 inp->inp_vflag &= ~INP_IPV6;
867 soisconnected(so);
868 }
869 goto out;
870 }
871 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
872 error = EISCONN;
873 goto out;
874 }
875 error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr);
876 if (error != 0)
877 goto out;
878 error = in6_pcbconnect(inp, nam, td->td_ucred);
879 if (error == 0) {
880 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
881 /* should be non mapped addr */
882 inp->inp_vflag &= ~INP_IPV4;
883 inp->inp_vflag |= INP_IPV6;
884 }
885 soisconnected(so);
886 }
887 out:
888 INP_WUNLOCK(inp);
889 INP_INFO_WUNLOCK(&udbinfo);
890 return (error);
891 }
892
893 static void
894 udp6_detach(struct socket *so)
895 {
896 struct inpcb *inp;
897 struct udpcb *up;
898
899 inp = sotoinpcb(so);
900 KASSERT(inp != NULL, ("udp6_detach: inp == NULL"));
901
902 INP_INFO_WLOCK(&udbinfo);
903 INP_WLOCK(inp);
904 up = intoudpcb(inp);
905 KASSERT(up != NULL, ("%s: up == NULL", __func__));
906 in_pcbdetach(inp);
907 in_pcbfree(inp);
908 INP_INFO_WUNLOCK(&udbinfo);
909 udp_discardcb(up);
910 }
911
912 static int
913 udp6_disconnect(struct socket *so)
914 {
915 struct inpcb *inp;
916 int error;
917
918 inp = sotoinpcb(so);
919 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL"));
920
921 INP_INFO_WLOCK(&udbinfo);
922 INP_WLOCK(inp);
923
924 #ifdef INET
925 if (inp->inp_vflag & INP_IPV4) {
926 struct pr_usrreqs *pru;
927
928 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
929 error = (*pru->pru_disconnect)(so);
930 goto out;
931 }
932 #endif
933
934 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
935 error = ENOTCONN;
936 goto out;
937 }
938
939 in6_pcbdisconnect(inp);
940 inp->in6p_laddr = in6addr_any;
941 SOCK_LOCK(so);
942 so->so_state &= ~SS_ISCONNECTED; /* XXX */
943 SOCK_UNLOCK(so);
944 out:
945 INP_WUNLOCK(inp);
946 INP_INFO_WUNLOCK(&udbinfo);
947 return (0);
948 }
949
950 static int
951 udp6_send(struct socket *so, int flags, struct mbuf *m,
952 struct sockaddr *addr, struct mbuf *control, struct thread *td)
953 {
954 struct inpcb *inp;
955 int error = 0;
956
957 inp = sotoinpcb(so);
958 KASSERT(inp != NULL, ("udp6_send: inp == NULL"));
959
960 INP_INFO_WLOCK(&udbinfo);
961 INP_WLOCK(inp);
962 if (addr) {
963 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
964 error = EINVAL;
965 goto bad;
966 }
967 if (addr->sa_family != AF_INET6) {
968 error = EAFNOSUPPORT;
969 goto bad;
970 }
971 }
972
973 #ifdef INET
974 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
975 int hasv4addr;
976 struct sockaddr_in6 *sin6 = 0;
977
978 if (addr == 0)
979 hasv4addr = (inp->inp_vflag & INP_IPV4);
980 else {
981 sin6 = (struct sockaddr_in6 *)addr;
982 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
983 ? 1 : 0;
984 }
985 if (hasv4addr) {
986 struct pr_usrreqs *pru;
987
988 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
989 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) {
990 /*
991 * When remote addr is IPv4-mapped address,
992 * local addr should not be an IPv6 address;
993 * since you cannot determine how to map IPv6
994 * source address to IPv4.
995 */
996 error = EINVAL;
997 goto out;
998 }
999
1000 /*
1001 * XXXRW: We release UDP-layer locks before calling
1002 * udp_send() in order to avoid recursion. However,
1003 * this does mean there is a short window where inp's
1004 * fields are unstable. Could this lead to a
1005 * potential race in which the factors causing us to
1006 * select the UDPv4 output routine are invalidated?
1007 */
1008 INP_WUNLOCK(inp);
1009 INP_INFO_WUNLOCK(&udbinfo);
1010 if (sin6)
1011 in6_sin6_2_sin_in_sock(addr);
1012 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
1013 /* addr will just be freed in sendit(). */
1014 return ((*pru->pru_send)(so, flags, m, addr, control,
1015 td));
1016 }
1017 }
1018 #endif
1019 #ifdef MAC
1020 mac_create_mbuf_from_inpcb(inp, m);
1021 #endif
1022 error = udp6_output(inp, m, addr, control, td);
1023 out:
1024 INP_WUNLOCK(inp);
1025 INP_INFO_WUNLOCK(&udbinfo);
1026 return (error);
1027
1028 bad:
1029 INP_WUNLOCK(inp);
1030 INP_INFO_WUNLOCK(&udbinfo);
1031 m_freem(m);
1032 return (error);
1033 }
1034
1035 struct pr_usrreqs udp6_usrreqs = {
1036 .pru_abort = udp6_abort,
1037 .pru_attach = udp6_attach,
1038 .pru_bind = udp6_bind,
1039 .pru_connect = udp6_connect,
1040 .pru_control = in6_control,
1041 .pru_detach = udp6_detach,
1042 .pru_disconnect = udp6_disconnect,
1043 .pru_peeraddr = in6_mapped_peeraddr,
1044 .pru_send = udp6_send,
1045 .pru_shutdown = udp_shutdown,
1046 .pru_sockaddr = in6_mapped_sockaddr,
1047 .pru_sosend = sosend_dgram,
1048 .pru_sosetlabel = in_pcbsosetlabel,
1049 .pru_close = udp6_close
1050 };
Cache object: 7c9f85df1c021d07b8474c9af5f940ad
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