1 /*-
2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
3 * Copyright (c) 2010-2011 Juniper Networks, Inc.
4 * Copyright (c) 2014 Kevin Lo
5 * All rights reserved.
6 *
7 * Portions of this software were developed by Robert N. M. Watson under
8 * contract to Juniper Networks, Inc.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the project nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $
35 * $KAME: udp6_output.c,v 1.31 2001/05/21 16:39:15 jinmei Exp $
36 */
37
38 /*-
39 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
40 * The Regents of the University of California.
41 * All rights reserved.
42 *
43 * Redistribution and use in source and binary forms, with or without
44 * modification, are permitted provided that the following conditions
45 * are met:
46 * 1. Redistributions of source code must retain the above copyright
47 * notice, this list of conditions and the following disclaimer.
48 * 2. Redistributions in binary form must reproduce the above copyright
49 * notice, this list of conditions and the following disclaimer in the
50 * documentation and/or other materials provided with the distribution.
51 * 4. Neither the name of the University nor the names of its contributors
52 * may be used to endorse or promote products derived from this software
53 * without specific prior written permission.
54 *
55 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
56 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
57 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
58 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
59 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
60 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
61 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
62 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
63 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
65 * SUCH DAMAGE.
66 *
67 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95
68 */
69
70 #include <sys/cdefs.h>
71 __FBSDID("$FreeBSD: releng/10.3/sys/netinet6/udp6_usrreq.c 277789 2015-01-27 06:19:30Z bryanv $");
72
73 #include "opt_inet.h"
74 #include "opt_inet6.h"
75 #include "opt_ipfw.h"
76 #include "opt_ipsec.h"
77 #include "opt_kdtrace.h"
78
79 #include <sys/param.h>
80 #include <sys/jail.h>
81 #include <sys/kernel.h>
82 #include <sys/lock.h>
83 #include <sys/mbuf.h>
84 #include <sys/priv.h>
85 #include <sys/proc.h>
86 #include <sys/protosw.h>
87 #include <sys/sdt.h>
88 #include <sys/signalvar.h>
89 #include <sys/socket.h>
90 #include <sys/socketvar.h>
91 #include <sys/sx.h>
92 #include <sys/sysctl.h>
93 #include <sys/syslog.h>
94 #include <sys/systm.h>
95
96 #include <net/if.h>
97 #include <net/if_types.h>
98 #include <net/route.h>
99
100 #include <netinet/in.h>
101 #include <netinet/in_kdtrace.h>
102 #include <netinet/in_pcb.h>
103 #include <netinet/in_systm.h>
104 #include <netinet/in_var.h>
105 #include <netinet/ip.h>
106 #include <netinet/ip_icmp.h>
107 #include <netinet/ip6.h>
108 #include <netinet/icmp_var.h>
109 #include <netinet/icmp6.h>
110 #include <netinet/ip_var.h>
111 #include <netinet/udp.h>
112 #include <netinet/udp_var.h>
113 #include <netinet/udplite.h>
114
115 #include <netinet6/ip6protosw.h>
116 #include <netinet6/ip6_var.h>
117 #include <netinet6/in6_pcb.h>
118 #include <netinet6/udp6_var.h>
119 #include <netinet6/scope6_var.h>
120
121 #ifdef IPSEC
122 #include <netipsec/ipsec.h>
123 #include <netipsec/ipsec6.h>
124 #endif /* IPSEC */
125
126 #include <security/mac/mac_framework.h>
127
128 /*
129 * UDP protocol implementation.
130 * Per RFC 768, August, 1980.
131 */
132
133 extern struct protosw inetsw[];
134 static void udp6_detach(struct socket *so);
135
136 static void
137 udp6_append(struct inpcb *inp, struct mbuf *n, int off,
138 struct sockaddr_in6 *fromsa)
139 {
140 struct socket *so;
141 struct mbuf *opts;
142 struct udpcb *up;
143
144 INP_LOCK_ASSERT(inp);
145
146 /*
147 * Engage the tunneling protocol.
148 */
149 up = intoudpcb(inp);
150 if (up->u_tun_func != NULL) {
151 (*up->u_tun_func)(n, off, inp, (struct sockaddr *)fromsa,
152 up->u_tun_ctx);
153 return;
154 }
155 #ifdef IPSEC
156 /* Check AH/ESP integrity. */
157 if (ipsec6_in_reject(n, inp)) {
158 m_freem(n);
159 IPSEC6STAT_INC(ips_in_polvio);
160 return;
161 }
162 #endif /* IPSEC */
163 #ifdef MAC
164 if (mac_inpcb_check_deliver(inp, n) != 0) {
165 m_freem(n);
166 return;
167 }
168 #endif
169 opts = NULL;
170 if (inp->inp_flags & INP_CONTROLOPTS ||
171 inp->inp_socket->so_options & SO_TIMESTAMP)
172 ip6_savecontrol(inp, n, &opts);
173 m_adj(n, off + sizeof(struct udphdr));
174
175 so = inp->inp_socket;
176 SOCKBUF_LOCK(&so->so_rcv);
177 if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)fromsa, n,
178 opts) == 0) {
179 SOCKBUF_UNLOCK(&so->so_rcv);
180 m_freem(n);
181 if (opts)
182 m_freem(opts);
183 UDPSTAT_INC(udps_fullsock);
184 } else
185 sorwakeup_locked(so);
186 }
187
188 int
189 udp6_input(struct mbuf **mp, int *offp, int proto)
190 {
191 struct mbuf *m = *mp;
192 struct ifnet *ifp;
193 struct ip6_hdr *ip6;
194 struct udphdr *uh;
195 struct inpcb *inp;
196 struct inpcbinfo *pcbinfo;
197 struct udpcb *up;
198 int off = *offp;
199 int cscov_partial;
200 int plen, ulen;
201 struct sockaddr_in6 fromsa;
202 struct m_tag *fwd_tag;
203 uint16_t uh_sum;
204 uint8_t nxt;
205
206 ifp = m->m_pkthdr.rcvif;
207 ip6 = mtod(m, struct ip6_hdr *);
208
209 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
210 /* XXX send icmp6 host/port unreach? */
211 m_freem(m);
212 return (IPPROTO_DONE);
213 }
214
215 #ifndef PULLDOWN_TEST
216 IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
217 ip6 = mtod(m, struct ip6_hdr *);
218 uh = (struct udphdr *)((caddr_t)ip6 + off);
219 #else
220 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh));
221 if (!uh)
222 return (IPPROTO_DONE);
223 #endif
224
225 UDPSTAT_INC(udps_ipackets);
226
227 /*
228 * Destination port of 0 is illegal, based on RFC768.
229 */
230 if (uh->uh_dport == 0)
231 goto badunlocked;
232
233 plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
234 ulen = ntohs((u_short)uh->uh_ulen);
235
236 nxt = ip6->ip6_nxt;
237 cscov_partial = (nxt == IPPROTO_UDPLITE) ? 1 : 0;
238 if (nxt == IPPROTO_UDPLITE) {
239 /* Zero means checksum over the complete packet. */
240 if (ulen == 0)
241 ulen = plen;
242 if (ulen == plen)
243 cscov_partial = 0;
244 if ((ulen < sizeof(struct udphdr)) || (ulen > plen)) {
245 /* XXX: What is the right UDPLite MIB counter? */
246 goto badunlocked;
247 }
248 if (uh->uh_sum == 0) {
249 /* XXX: What is the right UDPLite MIB counter? */
250 goto badunlocked;
251 }
252 } else {
253 if ((ulen < sizeof(struct udphdr)) || (plen != ulen)) {
254 UDPSTAT_INC(udps_badlen);
255 goto badunlocked;
256 }
257 if (uh->uh_sum == 0) {
258 UDPSTAT_INC(udps_nosum);
259 goto badunlocked;
260 }
261 }
262
263 if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID_IPV6) &&
264 !cscov_partial) {
265 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
266 uh_sum = m->m_pkthdr.csum_data;
267 else
268 uh_sum = in6_cksum_pseudo(ip6, ulen, nxt,
269 m->m_pkthdr.csum_data);
270 uh_sum ^= 0xffff;
271 } else
272 uh_sum = in6_cksum_partial(m, nxt, off, plen, ulen);
273
274 if (uh_sum != 0) {
275 UDPSTAT_INC(udps_badsum);
276 goto badunlocked;
277 }
278
279 /*
280 * Construct sockaddr format source address.
281 */
282 init_sin6(&fromsa, m);
283 fromsa.sin6_port = uh->uh_sport;
284
285 pcbinfo = get_inpcbinfo(nxt);
286 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
287 struct inpcb *last;
288 struct inpcbhead *pcblist;
289 struct ip6_moptions *imo;
290
291 INP_INFO_RLOCK(pcbinfo);
292 /*
293 * In the event that laddr should be set to the link-local
294 * address (this happens in RIPng), the multicast address
295 * specified in the received packet will not match laddr. To
296 * handle this situation, matching is relaxed if the
297 * receiving interface is the same as one specified in the
298 * socket and if the destination multicast address matches
299 * one of the multicast groups specified in the socket.
300 */
301
302 /*
303 * KAME note: traditionally we dropped udpiphdr from mbuf
304 * here. We need udphdr for IPsec processing so we do that
305 * later.
306 */
307 pcblist = get_pcblist(nxt);
308 last = NULL;
309 LIST_FOREACH(inp, pcblist, inp_list) {
310 if ((inp->inp_vflag & INP_IPV6) == 0)
311 continue;
312 if (inp->inp_lport != uh->uh_dport)
313 continue;
314 if (inp->inp_fport != 0 &&
315 inp->inp_fport != uh->uh_sport)
316 continue;
317 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
318 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
319 &ip6->ip6_dst))
320 continue;
321 }
322 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
323 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
324 &ip6->ip6_src) ||
325 inp->inp_fport != uh->uh_sport)
326 continue;
327 }
328
329 /*
330 * XXXRW: Because we weren't holding either the inpcb
331 * or the hash lock when we checked for a match
332 * before, we should probably recheck now that the
333 * inpcb lock is (supposed to be) held.
334 */
335
336 /*
337 * Handle socket delivery policy for any-source
338 * and source-specific multicast. [RFC3678]
339 */
340 imo = inp->in6p_moptions;
341 if (imo && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
342 struct sockaddr_in6 mcaddr;
343 int blocked;
344
345 INP_RLOCK(inp);
346
347 bzero(&mcaddr, sizeof(struct sockaddr_in6));
348 mcaddr.sin6_len = sizeof(struct sockaddr_in6);
349 mcaddr.sin6_family = AF_INET6;
350 mcaddr.sin6_addr = ip6->ip6_dst;
351
352 blocked = im6o_mc_filter(imo, ifp,
353 (struct sockaddr *)&mcaddr,
354 (struct sockaddr *)&fromsa);
355 if (blocked != MCAST_PASS) {
356 if (blocked == MCAST_NOTGMEMBER)
357 IP6STAT_INC(ip6s_notmember);
358 if (blocked == MCAST_NOTSMEMBER ||
359 blocked == MCAST_MUTED)
360 UDPSTAT_INC(udps_filtermcast);
361 INP_RUNLOCK(inp); /* XXX */
362 continue;
363 }
364
365 INP_RUNLOCK(inp);
366 }
367 if (last != NULL) {
368 struct mbuf *n;
369
370 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
371 INP_RLOCK(last);
372 UDP_PROBE(receive, NULL, last, ip6,
373 last, uh);
374 udp6_append(last, n, off, &fromsa);
375 INP_RUNLOCK(last);
376 }
377 }
378 last = inp;
379 /*
380 * Don't look for additional matches if this one does
381 * not have either the SO_REUSEPORT or SO_REUSEADDR
382 * socket options set. This heuristic avoids
383 * searching through all pcbs in the common case of a
384 * non-shared port. It assumes that an application
385 * will never clear these options after setting them.
386 */
387 if ((last->inp_socket->so_options &
388 (SO_REUSEPORT|SO_REUSEADDR)) == 0)
389 break;
390 }
391
392 if (last == NULL) {
393 /*
394 * No matching pcb found; discard datagram. (No need
395 * to send an ICMP Port Unreachable for a broadcast
396 * or multicast datgram.)
397 */
398 UDPSTAT_INC(udps_noport);
399 UDPSTAT_INC(udps_noportmcast);
400 goto badheadlocked;
401 }
402 INP_RLOCK(last);
403 INP_INFO_RUNLOCK(pcbinfo);
404 UDP_PROBE(receive, NULL, last, ip6, last, uh);
405 udp6_append(last, m, off, &fromsa);
406 INP_RUNLOCK(last);
407 return (IPPROTO_DONE);
408 }
409 /*
410 * Locate pcb for datagram.
411 */
412
413 /*
414 * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
415 */
416 if ((m->m_flags & M_IP6_NEXTHOP) &&
417 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
418 struct sockaddr_in6 *next_hop6;
419
420 next_hop6 = (struct sockaddr_in6 *)(fwd_tag + 1);
421
422 /*
423 * Transparently forwarded. Pretend to be the destination.
424 * Already got one like this?
425 */
426 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src,
427 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
428 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif, m);
429 if (!inp) {
430 /*
431 * It's new. Try to find the ambushing socket.
432 * Because we've rewritten the destination address,
433 * any hardware-generated hash is ignored.
434 */
435 inp = in6_pcblookup(pcbinfo, &ip6->ip6_src,
436 uh->uh_sport, &next_hop6->sin6_addr,
437 next_hop6->sin6_port ? htons(next_hop6->sin6_port) :
438 uh->uh_dport, INPLOOKUP_WILDCARD |
439 INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif);
440 }
441 /* Remove the tag from the packet. We don't need it anymore. */
442 m_tag_delete(m, fwd_tag);
443 m->m_flags &= ~M_IP6_NEXTHOP;
444 } else
445 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src,
446 uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
447 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB,
448 m->m_pkthdr.rcvif, m);
449 if (inp == NULL) {
450 if (udp_log_in_vain) {
451 char ip6bufs[INET6_ADDRSTRLEN];
452 char ip6bufd[INET6_ADDRSTRLEN];
453
454 log(LOG_INFO,
455 "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
456 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
457 ntohs(uh->uh_dport),
458 ip6_sprintf(ip6bufs, &ip6->ip6_src),
459 ntohs(uh->uh_sport));
460 }
461 UDPSTAT_INC(udps_noport);
462 if (m->m_flags & M_MCAST) {
463 printf("UDP6: M_MCAST is set in a unicast packet.\n");
464 UDPSTAT_INC(udps_noportmcast);
465 goto badunlocked;
466 }
467 if (V_udp_blackhole)
468 goto badunlocked;
469 if (badport_bandlim(BANDLIM_ICMP6_UNREACH) < 0)
470 goto badunlocked;
471 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
472 return (IPPROTO_DONE);
473 }
474 INP_RLOCK_ASSERT(inp);
475 up = intoudpcb(inp);
476 if (cscov_partial) {
477 if (up->u_rxcslen == 0 || up->u_rxcslen > ulen) {
478 INP_RUNLOCK(inp);
479 m_freem(m);
480 return (IPPROTO_DONE);
481 }
482 }
483 UDP_PROBE(receive, NULL, inp, ip6, inp, uh);
484 udp6_append(inp, m, off, &fromsa);
485 INP_RUNLOCK(inp);
486 return (IPPROTO_DONE);
487
488 badheadlocked:
489 INP_INFO_RUNLOCK(pcbinfo);
490 badunlocked:
491 if (m)
492 m_freem(m);
493 return (IPPROTO_DONE);
494 }
495
496 static void
497 udp6_common_ctlinput(int cmd, struct sockaddr *sa, void *d,
498 struct inpcbinfo *pcbinfo)
499 {
500 struct udphdr uh;
501 struct ip6_hdr *ip6;
502 struct mbuf *m;
503 int off = 0;
504 struct ip6ctlparam *ip6cp = NULL;
505 const struct sockaddr_in6 *sa6_src = NULL;
506 void *cmdarg;
507 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify;
508 struct udp_portonly {
509 u_int16_t uh_sport;
510 u_int16_t uh_dport;
511 } *uhp;
512
513 if (sa->sa_family != AF_INET6 ||
514 sa->sa_len != sizeof(struct sockaddr_in6))
515 return;
516
517 if ((unsigned)cmd >= PRC_NCMDS)
518 return;
519 if (PRC_IS_REDIRECT(cmd))
520 notify = in6_rtchange, d = NULL;
521 else if (cmd == PRC_HOSTDEAD)
522 d = NULL;
523 else if (inet6ctlerrmap[cmd] == 0)
524 return;
525
526 /* if the parameter is from icmp6, decode it. */
527 if (d != NULL) {
528 ip6cp = (struct ip6ctlparam *)d;
529 m = ip6cp->ip6c_m;
530 ip6 = ip6cp->ip6c_ip6;
531 off = ip6cp->ip6c_off;
532 cmdarg = ip6cp->ip6c_cmdarg;
533 sa6_src = ip6cp->ip6c_src;
534 } else {
535 m = NULL;
536 ip6 = NULL;
537 cmdarg = NULL;
538 sa6_src = &sa6_any;
539 }
540
541 if (ip6) {
542 /*
543 * XXX: We assume that when IPV6 is non NULL,
544 * M and OFF are valid.
545 */
546
547 /* Check if we can safely examine src and dst ports. */
548 if (m->m_pkthdr.len < off + sizeof(*uhp))
549 return;
550
551 bzero(&uh, sizeof(uh));
552 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
553
554 (void)in6_pcbnotify(pcbinfo, sa, uh.uh_dport,
555 (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd,
556 cmdarg, notify);
557 } else
558 (void)in6_pcbnotify(pcbinfo, sa, 0,
559 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
560 }
561
562 void
563 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
564 {
565
566 return (udp6_common_ctlinput(cmd, sa, d, &V_udbinfo));
567 }
568
569 void
570 udplite6_ctlinput(int cmd, struct sockaddr *sa, void *d)
571 {
572
573 return (udp6_common_ctlinput(cmd, sa, d, &V_ulitecbinfo));
574 }
575
576 static int
577 udp6_getcred(SYSCTL_HANDLER_ARGS)
578 {
579 struct xucred xuc;
580 struct sockaddr_in6 addrs[2];
581 struct inpcb *inp;
582 int error;
583
584 error = priv_check(req->td, PRIV_NETINET_GETCRED);
585 if (error)
586 return (error);
587
588 if (req->newlen != sizeof(addrs))
589 return (EINVAL);
590 if (req->oldlen != sizeof(struct xucred))
591 return (EINVAL);
592 error = SYSCTL_IN(req, addrs, sizeof(addrs));
593 if (error)
594 return (error);
595 if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 ||
596 (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) {
597 return (error);
598 }
599 inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr,
600 addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port,
601 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
602 if (inp != NULL) {
603 INP_RLOCK_ASSERT(inp);
604 if (inp->inp_socket == NULL)
605 error = ENOENT;
606 if (error == 0)
607 error = cr_canseesocket(req->td->td_ucred,
608 inp->inp_socket);
609 if (error == 0)
610 cru2x(inp->inp_cred, &xuc);
611 INP_RUNLOCK(inp);
612 } else
613 error = ENOENT;
614 if (error == 0)
615 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
616 return (error);
617 }
618
619 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0,
620 0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection");
621
622 static int
623 udp6_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr6,
624 struct mbuf *control, struct thread *td)
625 {
626 u_int32_t ulen = m->m_pkthdr.len;
627 u_int32_t plen = sizeof(struct udphdr) + ulen;
628 struct ip6_hdr *ip6;
629 struct udphdr *udp6;
630 struct in6_addr *laddr, *faddr, in6a;
631 struct sockaddr_in6 *sin6 = NULL;
632 struct ifnet *oifp = NULL;
633 int cscov_partial = 0;
634 int scope_ambiguous = 0;
635 u_short fport;
636 int error = 0;
637 uint8_t nxt;
638 uint16_t cscov = 0;
639 struct ip6_pktopts *optp, opt;
640 int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
641 int flags;
642 struct sockaddr_in6 tmp;
643
644 INP_WLOCK_ASSERT(inp);
645 INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
646
647 if (addr6) {
648 /* addr6 has been validated in udp6_send(). */
649 sin6 = (struct sockaddr_in6 *)addr6;
650
651 /* protect *sin6 from overwrites */
652 tmp = *sin6;
653 sin6 = &tmp;
654
655 /*
656 * Application should provide a proper zone ID or the use of
657 * default zone IDs should be enabled. Unfortunately, some
658 * applications do not behave as it should, so we need a
659 * workaround. Even if an appropriate ID is not determined,
660 * we'll see if we can determine the outgoing interface. If we
661 * can, determine the zone ID based on the interface below.
662 */
663 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone)
664 scope_ambiguous = 1;
665 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
666 return (error);
667 }
668
669 if (control) {
670 if ((error = ip6_setpktopts(control, &opt,
671 inp->in6p_outputopts, td->td_ucred, IPPROTO_UDP)) != 0)
672 goto release;
673 optp = &opt;
674 } else
675 optp = inp->in6p_outputopts;
676
677 if (sin6) {
678 faddr = &sin6->sin6_addr;
679
680 /*
681 * Since we saw no essential reason for calling in_pcbconnect,
682 * we get rid of such kind of logic, and call in6_selectsrc
683 * and in6_pcbsetport in order to fill in the local address
684 * and the local port.
685 */
686 if (sin6->sin6_port == 0) {
687 error = EADDRNOTAVAIL;
688 goto release;
689 }
690
691 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
692 /* how about ::ffff:0.0.0.0 case? */
693 error = EISCONN;
694 goto release;
695 }
696
697 fport = sin6->sin6_port; /* allow 0 port */
698
699 if (IN6_IS_ADDR_V4MAPPED(faddr)) {
700 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
701 /*
702 * I believe we should explicitly discard the
703 * packet when mapped addresses are disabled,
704 * rather than send the packet as an IPv6 one.
705 * If we chose the latter approach, the packet
706 * might be sent out on the wire based on the
707 * default route, the situation which we'd
708 * probably want to avoid.
709 * (20010421 jinmei@kame.net)
710 */
711 error = EINVAL;
712 goto release;
713 }
714 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
715 !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) {
716 /*
717 * when remote addr is an IPv4-mapped address,
718 * local addr should not be an IPv6 address,
719 * since you cannot determine how to map IPv6
720 * source address to IPv4.
721 */
722 error = EINVAL;
723 goto release;
724 }
725
726 af = AF_INET;
727 }
728
729 if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
730 error = in6_selectsrc(sin6, optp, inp, NULL,
731 td->td_ucred, &oifp, &in6a);
732 if (error)
733 goto release;
734 if (oifp && scope_ambiguous &&
735 (error = in6_setscope(&sin6->sin6_addr,
736 oifp, NULL))) {
737 goto release;
738 }
739 laddr = &in6a;
740 } else
741 laddr = &inp->in6p_laddr; /* XXX */
742 if (laddr == NULL) {
743 if (error == 0)
744 error = EADDRNOTAVAIL;
745 goto release;
746 }
747 if (inp->inp_lport == 0 &&
748 (error = in6_pcbsetport(laddr, inp, td->td_ucred)) != 0) {
749 /* Undo an address bind that may have occurred. */
750 inp->in6p_laddr = in6addr_any;
751 goto release;
752 }
753 } else {
754 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
755 error = ENOTCONN;
756 goto release;
757 }
758 if (IN6_IS_ADDR_V4MAPPED(&inp->in6p_faddr)) {
759 if ((inp->inp_flags & IN6P_IPV6_V6ONLY)) {
760 /*
761 * XXX: this case would happen when the
762 * application sets the V6ONLY flag after
763 * connecting the foreign address.
764 * Such applications should be fixed,
765 * so we bark here.
766 */
767 log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
768 "option was set for a connected socket\n");
769 error = EINVAL;
770 goto release;
771 } else
772 af = AF_INET;
773 }
774 laddr = &inp->in6p_laddr;
775 faddr = &inp->in6p_faddr;
776 fport = inp->inp_fport;
777 }
778
779 if (af == AF_INET)
780 hlen = sizeof(struct ip);
781
782 /*
783 * Calculate data length and get a mbuf
784 * for UDP and IP6 headers.
785 */
786 M_PREPEND(m, hlen + sizeof(struct udphdr), M_NOWAIT);
787 if (m == 0) {
788 error = ENOBUFS;
789 goto release;
790 }
791
792 /*
793 * Stuff checksum and output datagram.
794 */
795 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
796 IPPROTO_UDP : IPPROTO_UDPLITE;
797 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
798 udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */
799 udp6->uh_dport = fport;
800 if (nxt == IPPROTO_UDPLITE) {
801 struct udpcb *up;
802
803 up = intoudpcb(inp);
804 cscov = up->u_txcslen;
805 if (cscov >= plen)
806 cscov = 0;
807 udp6->uh_ulen = htons(cscov);
808 /*
809 * For UDP-Lite, checksum coverage length of zero means
810 * the entire UDPLite packet is covered by the checksum.
811 */
812 cscov_partial = (cscov == 0) ? 0 : 1;
813 } else if (plen <= 0xffff)
814 udp6->uh_ulen = htons((u_short)plen);
815 else
816 udp6->uh_ulen = 0;
817 udp6->uh_sum = 0;
818
819 switch (af) {
820 case AF_INET6:
821 ip6 = mtod(m, struct ip6_hdr *);
822 ip6->ip6_flow = inp->inp_flow & IPV6_FLOWINFO_MASK;
823 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
824 ip6->ip6_vfc |= IPV6_VERSION;
825 ip6->ip6_plen = htons((u_short)plen);
826 ip6->ip6_nxt = nxt;
827 ip6->ip6_hlim = in6_selecthlim(inp, NULL);
828 ip6->ip6_src = *laddr;
829 ip6->ip6_dst = *faddr;
830
831 if (cscov_partial) {
832 if ((udp6->uh_sum = in6_cksum_partial(m, nxt,
833 sizeof(struct ip6_hdr), plen, cscov)) == 0)
834 udp6->uh_sum = 0xffff;
835 } else {
836 udp6->uh_sum = in6_cksum_pseudo(ip6, plen, nxt, 0);
837 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6;
838 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
839 }
840
841 flags = 0;
842
843 UDP_PROBE(send, NULL, inp, ip6, inp, udp6);
844 UDPSTAT_INC(udps_opackets);
845 error = ip6_output(m, optp, NULL, flags, inp->in6p_moptions,
846 NULL, inp);
847 break;
848 case AF_INET:
849 error = EAFNOSUPPORT;
850 goto release;
851 }
852 goto releaseopt;
853
854 release:
855 m_freem(m);
856
857 releaseopt:
858 if (control) {
859 ip6_clearpktopts(&opt, -1);
860 m_freem(control);
861 }
862 return (error);
863 }
864
865 static void
866 udp6_abort(struct socket *so)
867 {
868 struct inpcb *inp;
869 struct inpcbinfo *pcbinfo;
870
871 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
872 inp = sotoinpcb(so);
873 KASSERT(inp != NULL, ("udp6_abort: inp == NULL"));
874
875 #ifdef INET
876 if (inp->inp_vflag & INP_IPV4) {
877 struct pr_usrreqs *pru;
878
879 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
880 (*pru->pru_abort)(so);
881 return;
882 }
883 #endif
884
885 INP_WLOCK(inp);
886 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
887 INP_HASH_WLOCK(pcbinfo);
888 in6_pcbdisconnect(inp);
889 inp->in6p_laddr = in6addr_any;
890 INP_HASH_WUNLOCK(pcbinfo);
891 soisdisconnected(so);
892 }
893 INP_WUNLOCK(inp);
894 }
895
896 static int
897 udp6_attach(struct socket *so, int proto, struct thread *td)
898 {
899 struct inpcb *inp;
900 struct inpcbinfo *pcbinfo;
901 int error;
902
903 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
904 inp = sotoinpcb(so);
905 KASSERT(inp == NULL, ("udp6_attach: inp != NULL"));
906
907 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
908 error = soreserve(so, udp_sendspace, udp_recvspace);
909 if (error)
910 return (error);
911 }
912 INP_INFO_WLOCK(pcbinfo);
913 error = in_pcballoc(so, pcbinfo);
914 if (error) {
915 INP_INFO_WUNLOCK(pcbinfo);
916 return (error);
917 }
918 inp = (struct inpcb *)so->so_pcb;
919 inp->inp_vflag |= INP_IPV6;
920 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
921 inp->inp_vflag |= INP_IPV4;
922 inp->in6p_hops = -1; /* use kernel default */
923 inp->in6p_cksum = -1; /* just to be sure */
924 /*
925 * XXX: ugly!!
926 * IPv4 TTL initialization is necessary for an IPv6 socket as well,
927 * because the socket may be bound to an IPv6 wildcard address,
928 * which may match an IPv4-mapped IPv6 address.
929 */
930 inp->inp_ip_ttl = V_ip_defttl;
931
932 error = udp_newudpcb(inp);
933 if (error) {
934 in_pcbdetach(inp);
935 in_pcbfree(inp);
936 INP_INFO_WUNLOCK(pcbinfo);
937 return (error);
938 }
939 INP_WUNLOCK(inp);
940 INP_INFO_WUNLOCK(pcbinfo);
941 return (0);
942 }
943
944 static int
945 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
946 {
947 struct inpcb *inp;
948 struct inpcbinfo *pcbinfo;
949 int error;
950
951 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
952 inp = sotoinpcb(so);
953 KASSERT(inp != NULL, ("udp6_bind: inp == NULL"));
954
955 INP_WLOCK(inp);
956 INP_HASH_WLOCK(pcbinfo);
957 inp->inp_vflag &= ~INP_IPV4;
958 inp->inp_vflag |= INP_IPV6;
959 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
960 struct sockaddr_in6 *sin6_p;
961
962 sin6_p = (struct sockaddr_in6 *)nam;
963
964 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
965 inp->inp_vflag |= INP_IPV4;
966 #ifdef INET
967 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
968 struct sockaddr_in sin;
969
970 in6_sin6_2_sin(&sin, sin6_p);
971 inp->inp_vflag |= INP_IPV4;
972 inp->inp_vflag &= ~INP_IPV6;
973 error = in_pcbbind(inp, (struct sockaddr *)&sin,
974 td->td_ucred);
975 goto out;
976 }
977 #endif
978 }
979
980 error = in6_pcbbind(inp, nam, td->td_ucred);
981 #ifdef INET
982 out:
983 #endif
984 INP_HASH_WUNLOCK(pcbinfo);
985 INP_WUNLOCK(inp);
986 return (error);
987 }
988
989 static void
990 udp6_close(struct socket *so)
991 {
992 struct inpcb *inp;
993 struct inpcbinfo *pcbinfo;
994
995 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
996 inp = sotoinpcb(so);
997 KASSERT(inp != NULL, ("udp6_close: inp == NULL"));
998
999 #ifdef INET
1000 if (inp->inp_vflag & INP_IPV4) {
1001 struct pr_usrreqs *pru;
1002
1003 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
1004 (*pru->pru_disconnect)(so);
1005 return;
1006 }
1007 #endif
1008 INP_WLOCK(inp);
1009 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1010 INP_HASH_WLOCK(pcbinfo);
1011 in6_pcbdisconnect(inp);
1012 inp->in6p_laddr = in6addr_any;
1013 INP_HASH_WUNLOCK(pcbinfo);
1014 soisdisconnected(so);
1015 }
1016 INP_WUNLOCK(inp);
1017 }
1018
1019 static int
1020 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1021 {
1022 struct inpcb *inp;
1023 struct inpcbinfo *pcbinfo;
1024 struct sockaddr_in6 *sin6;
1025 int error;
1026
1027 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1028 inp = sotoinpcb(so);
1029 sin6 = (struct sockaddr_in6 *)nam;
1030 KASSERT(inp != NULL, ("udp6_connect: inp == NULL"));
1031
1032 /*
1033 * XXXRW: Need to clarify locking of v4/v6 flags.
1034 */
1035 INP_WLOCK(inp);
1036 #ifdef INET
1037 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
1038 struct sockaddr_in sin;
1039
1040 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
1041 error = EINVAL;
1042 goto out;
1043 }
1044 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1045 error = EISCONN;
1046 goto out;
1047 }
1048 in6_sin6_2_sin(&sin, sin6);
1049 inp->inp_vflag |= INP_IPV4;
1050 inp->inp_vflag &= ~INP_IPV6;
1051 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr);
1052 if (error != 0)
1053 goto out;
1054 INP_HASH_WLOCK(pcbinfo);
1055 error = in_pcbconnect(inp, (struct sockaddr *)&sin,
1056 td->td_ucred);
1057 INP_HASH_WUNLOCK(pcbinfo);
1058 if (error == 0)
1059 soisconnected(so);
1060 goto out;
1061 }
1062 #endif
1063 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1064 error = EISCONN;
1065 goto out;
1066 }
1067 inp->inp_vflag &= ~INP_IPV4;
1068 inp->inp_vflag |= INP_IPV6;
1069 error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr);
1070 if (error != 0)
1071 goto out;
1072 INP_HASH_WLOCK(pcbinfo);
1073 error = in6_pcbconnect(inp, nam, td->td_ucred);
1074 INP_HASH_WUNLOCK(pcbinfo);
1075 if (error == 0)
1076 soisconnected(so);
1077 out:
1078 INP_WUNLOCK(inp);
1079 return (error);
1080 }
1081
1082 static void
1083 udp6_detach(struct socket *so)
1084 {
1085 struct inpcb *inp;
1086 struct inpcbinfo *pcbinfo;
1087 struct udpcb *up;
1088
1089 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1090 inp = sotoinpcb(so);
1091 KASSERT(inp != NULL, ("udp6_detach: inp == NULL"));
1092
1093 INP_INFO_WLOCK(pcbinfo);
1094 INP_WLOCK(inp);
1095 up = intoudpcb(inp);
1096 KASSERT(up != NULL, ("%s: up == NULL", __func__));
1097 in_pcbdetach(inp);
1098 in_pcbfree(inp);
1099 INP_INFO_WUNLOCK(pcbinfo);
1100 udp_discardcb(up);
1101 }
1102
1103 static int
1104 udp6_disconnect(struct socket *so)
1105 {
1106 struct inpcb *inp;
1107 struct inpcbinfo *pcbinfo;
1108 int error;
1109
1110 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1111 inp = sotoinpcb(so);
1112 KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL"));
1113
1114 #ifdef INET
1115 if (inp->inp_vflag & INP_IPV4) {
1116 struct pr_usrreqs *pru;
1117
1118 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
1119 (void)(*pru->pru_disconnect)(so);
1120 return (0);
1121 }
1122 #endif
1123
1124 INP_WLOCK(inp);
1125
1126 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
1127 error = ENOTCONN;
1128 goto out;
1129 }
1130
1131 INP_HASH_WLOCK(pcbinfo);
1132 in6_pcbdisconnect(inp);
1133 inp->in6p_laddr = in6addr_any;
1134 INP_HASH_WUNLOCK(pcbinfo);
1135 SOCK_LOCK(so);
1136 so->so_state &= ~SS_ISCONNECTED; /* XXX */
1137 SOCK_UNLOCK(so);
1138 out:
1139 INP_WUNLOCK(inp);
1140 return (0);
1141 }
1142
1143 static int
1144 udp6_send(struct socket *so, int flags, struct mbuf *m,
1145 struct sockaddr *addr, struct mbuf *control, struct thread *td)
1146 {
1147 struct inpcb *inp;
1148 struct inpcbinfo *pcbinfo;
1149 int error = 0;
1150
1151 pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1152 inp = sotoinpcb(so);
1153 KASSERT(inp != NULL, ("udp6_send: inp == NULL"));
1154
1155 INP_WLOCK(inp);
1156 if (addr) {
1157 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
1158 error = EINVAL;
1159 goto bad;
1160 }
1161 if (addr->sa_family != AF_INET6) {
1162 error = EAFNOSUPPORT;
1163 goto bad;
1164 }
1165 }
1166
1167 #ifdef INET
1168 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
1169 int hasv4addr;
1170 struct sockaddr_in6 *sin6 = 0;
1171
1172 if (addr == 0)
1173 hasv4addr = (inp->inp_vflag & INP_IPV4);
1174 else {
1175 sin6 = (struct sockaddr_in6 *)addr;
1176 hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
1177 ? 1 : 0;
1178 }
1179 if (hasv4addr) {
1180 struct pr_usrreqs *pru;
1181
1182 /*
1183 * XXXRW: We release UDP-layer locks before calling
1184 * udp_send() in order to avoid recursion. However,
1185 * this does mean there is a short window where inp's
1186 * fields are unstable. Could this lead to a
1187 * potential race in which the factors causing us to
1188 * select the UDPv4 output routine are invalidated?
1189 */
1190 INP_WUNLOCK(inp);
1191 if (sin6)
1192 in6_sin6_2_sin_in_sock(addr);
1193 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
1194 /* addr will just be freed in sendit(). */
1195 return ((*pru->pru_send)(so, flags, m, addr, control,
1196 td));
1197 }
1198 }
1199 #endif
1200 #ifdef MAC
1201 mac_inpcb_create_mbuf(inp, m);
1202 #endif
1203 INP_HASH_WLOCK(pcbinfo);
1204 error = udp6_output(inp, m, addr, control, td);
1205 INP_HASH_WUNLOCK(pcbinfo);
1206 #ifdef INET
1207 #endif
1208 INP_WUNLOCK(inp);
1209 return (error);
1210
1211 bad:
1212 INP_WUNLOCK(inp);
1213 m_freem(m);
1214 return (error);
1215 }
1216
1217 struct pr_usrreqs udp6_usrreqs = {
1218 .pru_abort = udp6_abort,
1219 .pru_attach = udp6_attach,
1220 .pru_bind = udp6_bind,
1221 .pru_connect = udp6_connect,
1222 .pru_control = in6_control,
1223 .pru_detach = udp6_detach,
1224 .pru_disconnect = udp6_disconnect,
1225 .pru_peeraddr = in6_mapped_peeraddr,
1226 .pru_send = udp6_send,
1227 .pru_shutdown = udp_shutdown,
1228 .pru_sockaddr = in6_mapped_sockaddr,
1229 .pru_soreceive = soreceive_dgram,
1230 .pru_sosend = sosend_dgram,
1231 .pru_sosetlabel = in_pcbsosetlabel,
1232 .pru_close = udp6_close
1233 };
Cache object: 12e6eb2e80772860ad3247cbbe7f17bc
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