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("$FreeBSD$");
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 /* Undo an address bind that may have occurred. */
602 inp->in6p_laddr = in6addr_any;
603 goto release;
604 }
605 } else {
606 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
607 error = ENOTCONN;
608 goto release;
609 }
610 if (IN6_IS_ADDR_V4MAPPED(&inp->in6p_faddr)) {
611 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
612 /*
613 * XXX: this case would happen when the
614 * application sets the V6ONLY flag after
615 * connecting the foreign address.
616 * Such applications should be fixed,
617 * so we bark here.
618 */
619 log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
620 "option was set for a connected socket\n");
621 error = EINVAL;
622 goto release;
623 } else
624 af = AF_INET;
625 }
626 laddr = &inp->in6p_laddr;
627 faddr = &inp->in6p_faddr;
628 fport = inp->inp_fport;
629 }
630
631 if (af == AF_INET)
632 hlen = sizeof(struct ip);
633
634 /*
635 * Calculate data length and get a mbuf
636 * for UDP and IP6 headers.
637 */
638 M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT);
639 if (m == 0) {
640 error = ENOBUFS;
641 goto release;
642 }
643
644 /*
645 * Stuff checksum and output datagram.
646 */
647 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
648 udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */
649 udp6->uh_dport = fport;
650 if (plen <= 0xffff)
651 udp6->uh_ulen = htons((u_short)plen);
652 else
653 udp6->uh_ulen = 0;
654 udp6->uh_sum = 0;
655
656 switch (af) {
657 case AF_INET6:
658 ip6 = mtod(m, struct ip6_hdr *);
659 ip6->ip6_flow = inp->inp_flow & IPV6_FLOWINFO_MASK;
660 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
661 ip6->ip6_vfc |= IPV6_VERSION;
662 #if 0 /* ip6_plen will be filled in ip6_output. */
663 ip6->ip6_plen = htons((u_short)plen);
664 #endif
665 ip6->ip6_nxt = IPPROTO_UDP;
666 ip6->ip6_hlim = in6_selecthlim(inp, NULL);
667 ip6->ip6_src = *laddr;
668 ip6->ip6_dst = *faddr;
669
670 if ((udp6->uh_sum = in6_cksum(m, IPPROTO_UDP,
671 sizeof(struct ip6_hdr), plen)) == 0) {
672 udp6->uh_sum = 0xffff;
673 }
674
675 flags = 0;
676
677 udpstat.udps_opackets++;
678 error = ip6_output(m, optp, NULL, flags, inp->in6p_moptions,
679 NULL, inp);
680 break;
681 case AF_INET:
682 error = EAFNOSUPPORT;
683 goto release;
684 }
685 goto releaseopt;
686
687 release:
688 m_freem(m);
689
690 releaseopt:
691 if (control) {
692 ip6_clearpktopts(&opt, -1);
693 m_freem(control);
694 }
695 return (error);
696 }
697
698 static void
699 udp6_abort(struct socket *so)
700 {
701 struct inpcb *inp;
702
703 inp = sotoinpcb(so);
704 KASSERT(inp != NULL, ("udp6_abort: inp == NULL"));
705
706 #ifdef INET
707 if (inp->inp_vflag & INP_IPV4) {
708 struct pr_usrreqs *pru;
709
710 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
711 (*pru->pru_abort)(so);
712 return;
713 }
714 #endif
715
716 INP_INFO_WLOCK(&udbinfo);
717 INP_WLOCK(inp);
718 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
719 in6_pcbdisconnect(inp);
720 inp->in6p_laddr = in6addr_any;
721 soisdisconnected(so);
722 }
723 INP_WUNLOCK(inp);
724 INP_INFO_WUNLOCK(&udbinfo);
725 }
726
727 static int
728 udp6_attach(struct socket *so, int proto, struct thread *td)
729 {
730 struct inpcb *inp;
731 int error;
732
733 inp = sotoinpcb(so);
734 KASSERT(inp == NULL, ("udp6_attach: inp != NULL"));
735
736 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
737 error = soreserve(so, udp_sendspace, udp_recvspace);
738 if (error)
739 return (error);
740 }
741 INP_INFO_WLOCK(&udbinfo);
742 error = in_pcballoc(so, &udbinfo);
743 if (error) {
744 INP_INFO_WUNLOCK(&udbinfo);
745 return (error);
746 }
747 inp = (struct inpcb *)so->so_pcb;
748 inp->inp_vflag |= INP_IPV6;
749 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
750 inp->inp_vflag |= INP_IPV4;
751 inp->in6p_hops = -1; /* use kernel default */
752 inp->in6p_cksum = -1; /* just to be sure */
753 /*
754 * XXX: ugly!!
755 * IPv4 TTL initialization is necessary for an IPv6 socket as well,
756 * because the socket may be bound to an IPv6 wildcard address,
757 * which may match an IPv4-mapped IPv6 address.
758 */
759 inp->inp_ip_ttl = ip_defttl;
760
761 error = udp_newudpcb(inp);
762 if (error) {
763 in_pcbdetach(inp);
764 in_pcbfree(inp);
765 INP_INFO_WUNLOCK(&udbinfo);
766 return (error);
767 }
768 INP_WUNLOCK(inp);
769 INP_INFO_WUNLOCK(&udbinfo);
770 return (0);
771 }
772
773 static int
774 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
775 {
776 struct inpcb *inp;
777 int error;
778
779 inp = sotoinpcb(so);
780 KASSERT(inp != NULL, ("udp6_bind: inp == NULL"));
781
782 INP_INFO_WLOCK(&udbinfo);
783 INP_WLOCK(inp);
784 inp->inp_vflag &= ~INP_IPV4;
785 inp->inp_vflag |= INP_IPV6;
786 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
787 struct sockaddr_in6 *sin6_p;
788
789 sin6_p = (struct sockaddr_in6 *)nam;
790
791 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
792 inp->inp_vflag |= INP_IPV4;
793 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
794 struct sockaddr_in sin;
795
796 in6_sin6_2_sin(&sin, sin6_p);
797 inp->inp_vflag |= INP_IPV4;
798 inp->inp_vflag &= ~INP_IPV6;
799 error = in_pcbbind(inp, (struct sockaddr *)&sin,
800 td->td_ucred);
801 goto out;
802 }
803 }
804
805 error = in6_pcbbind(inp, nam, td->td_ucred);
806 out:
807 INP_WUNLOCK(inp);
808 INP_INFO_WUNLOCK(&udbinfo);
809 return (error);
810 }
811
812 static void
813 udp6_close(struct socket *so)
814 {
815 struct inpcb *inp;
816
817 inp = sotoinpcb(so);
818 KASSERT(inp != NULL, ("udp6_close: inp == NULL"));
819
820 #ifdef INET
821 if (inp->inp_vflag & INP_IPV4) {
822 struct pr_usrreqs *pru;
823
824 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
825 (*pru->pru_disconnect)(so);
826 return;
827 }
828 #endif
829 INP_INFO_WLOCK(&udbinfo);
830 INP_WLOCK(inp);
831 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
832 in6_pcbdisconnect(inp);
833 inp->in6p_laddr = in6addr_any;
834 soisdisconnected(so);
835 }
836 INP_WUNLOCK(inp);
837 INP_INFO_WUNLOCK(&udbinfo);
838 }
839
840 static int
841 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
842 {
843 struct inpcb *inp;
844 struct sockaddr_in6 *sin6;
845 int error;
846
847 inp = sotoinpcb(so);
848 sin6 = (struct sockaddr_in6 *)nam;
849 KASSERT(inp != NULL, ("udp6_connect: inp == NULL"));
850
851 INP_INFO_WLOCK(&udbinfo);
852 INP_WLOCK(inp);
853 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
854 struct sockaddr_in sin;
855
856 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
857 error = EINVAL;
858 goto out;
859 }
860 if (inp->inp_faddr.s_addr != INADDR_ANY) {
861 error = EISCONN;
862 goto out;
863 }
864 in6_sin6_2_sin(&sin, sin6);
865 inp->inp_vflag |= INP_IPV4;
866 inp->inp_vflag &= ~INP_IPV6;
867 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr);
868 if (error != 0)
869 goto out;
870 error = in_pcbconnect(inp, (struct sockaddr *)&sin,
871 td->td_ucred);
872 if (error == 0)
873 soisconnected(so);
874 goto out;
875 }
876 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
877 error = EISCONN;
878 goto out;
879 }
880 inp->inp_vflag &= ~INP_IPV4;
881 inp->inp_vflag |= INP_IPV6;
882 error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr);
883 if (error != 0)
884 goto out;
885 error = in6_pcbconnect(inp, nam, td->td_ucred);
886 if (error == 0)
887 soisconnected(so);
888 out:
889 INP_WUNLOCK(inp);
890 INP_INFO_WUNLOCK(&udbinfo);
891 return (error);
892 }
893
894 static void
895 udp6_detach(struct socket *so)
896 {
897 struct inpcb *inp;
898 struct udpcb *up;
899
900 inp = sotoinpcb(so);
901 KASSERT(inp != NULL, ("udp6_detach: inp == NULL"));
902
903 INP_INFO_WLOCK(&udbinfo);
904 INP_WLOCK(inp);
905 up = intoudpcb(inp);
906 KASSERT(up != NULL, ("%s: up == NULL", __func__));
907 in_pcbdetach(inp);
908 in_pcbfree(inp);
909 INP_INFO_WUNLOCK(&udbinfo);
910 udp_discardcb(up);
911 }
912
913 static int
914 udp6_disconnect(struct socket *so)
915 {
916 struct inpcb *inp;
917 int error;
918
919 inp = sotoinpcb(so);
920 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL"));
921
922 INP_INFO_WLOCK(&udbinfo);
923 INP_WLOCK(inp);
924
925 #ifdef INET
926 if (inp->inp_vflag & INP_IPV4) {
927 struct pr_usrreqs *pru;
928
929 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
930 error = (*pru->pru_disconnect)(so);
931 goto out;
932 }
933 #endif
934
935 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
936 error = ENOTCONN;
937 goto out;
938 }
939
940 in6_pcbdisconnect(inp);
941 inp->in6p_laddr = in6addr_any;
942 SOCK_LOCK(so);
943 so->so_state &= ~SS_ISCONNECTED; /* XXX */
944 SOCK_UNLOCK(so);
945 out:
946 INP_WUNLOCK(inp);
947 INP_INFO_WUNLOCK(&udbinfo);
948 return (0);
949 }
950
951 static int
952 udp6_send(struct socket *so, int flags, struct mbuf *m,
953 struct sockaddr *addr, struct mbuf *control, struct thread *td)
954 {
955 struct inpcb *inp;
956 int error = 0;
957
958 inp = sotoinpcb(so);
959 KASSERT(inp != NULL, ("udp6_send: inp == NULL"));
960
961 INP_INFO_WLOCK(&udbinfo);
962 INP_WLOCK(inp);
963 if (addr) {
964 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
965 error = EINVAL;
966 goto bad;
967 }
968 if (addr->sa_family != AF_INET6) {
969 error = EAFNOSUPPORT;
970 goto bad;
971 }
972 }
973
974 #ifdef INET
975 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
976 int hasv4addr;
977 struct sockaddr_in6 *sin6 = 0;
978
979 if (addr == 0)
980 hasv4addr = (inp->inp_vflag & INP_IPV4);
981 else {
982 sin6 = (struct sockaddr_in6 *)addr;
983 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
984 ? 1 : 0;
985 }
986 if (hasv4addr) {
987 struct pr_usrreqs *pru;
988
989 /*
990 * XXXRW: We release UDP-layer locks before calling
991 * udp_send() in order to avoid recursion. However,
992 * this does mean there is a short window where inp's
993 * fields are unstable. Could this lead to a
994 * potential race in which the factors causing us to
995 * select the UDPv4 output routine are invalidated?
996 */
997 INP_WUNLOCK(inp);
998 INP_INFO_WUNLOCK(&udbinfo);
999 if (sin6)
1000 in6_sin6_2_sin_in_sock(addr);
1001 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
1002 /* addr will just be freed in sendit(). */
1003 return ((*pru->pru_send)(so, flags, m, addr, control,
1004 td));
1005 }
1006 }
1007 #endif
1008 #ifdef MAC
1009 mac_create_mbuf_from_inpcb(inp, m);
1010 #endif
1011 error = udp6_output(inp, m, addr, control, td);
1012 INP_WUNLOCK(inp);
1013 INP_INFO_WUNLOCK(&udbinfo);
1014 return (error);
1015
1016 bad:
1017 INP_WUNLOCK(inp);
1018 INP_INFO_WUNLOCK(&udbinfo);
1019 m_freem(m);
1020 return (error);
1021 }
1022
1023 struct pr_usrreqs udp6_usrreqs = {
1024 .pru_abort = udp6_abort,
1025 .pru_attach = udp6_attach,
1026 .pru_bind = udp6_bind,
1027 .pru_connect = udp6_connect,
1028 .pru_control = in6_control,
1029 .pru_detach = udp6_detach,
1030 .pru_disconnect = udp6_disconnect,
1031 .pru_peeraddr = in6_mapped_peeraddr,
1032 .pru_send = udp6_send,
1033 .pru_shutdown = udp_shutdown,
1034 .pru_sockaddr = in6_mapped_sockaddr,
1035 .pru_sosend = sosend_dgram,
1036 .pru_sosetlabel = in_pcbsosetlabel,
1037 .pru_close = udp6_close
1038 };
Cache object: 48b3ce361ead3d2464ea45e1a7620a05
|