1/* $NetBSD: udp6_usrreq.c,v 1.126 2016/11/18 06:50:04 knakahara Exp $ */
2/* $KAME: udp6_usrreq.c,v 1.86 2001/05/27 17:33:00 itojun Exp $ */
3
4/*
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33/*
34 * Copyright (c) 1982, 1986, 1989, 1993
35 * The Regents of the University of California. All rights reserved.
36 *
37 * Redistribution and use in source and binary forms, with or without
38 * modification, are permitted provided that the following conditions
39 * are met:
40 * 1. Redistributions of source code must retain the above copyright
41 * notice, this list of conditions and the following disclaimer.
42 * 2. Redistributions in binary form must reproduce the above copyright
43 * notice, this list of conditions and the following disclaimer in the
44 * documentation and/or other materials provided with the distribution.
45 * 3. Neither the name of the University nor the names of its contributors
46 * may be used to endorse or promote products derived from this software
47 * without specific prior written permission.
48 *
49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
59 * SUCH DAMAGE.
60 *
61 * @(#)udp_var.h 8.1 (Berkeley) 6/10/93
62 */
63
64#include <sys/cdefs.h>
65__KERNEL_RCSID(0, "$NetBSD: udp6_usrreq.c,v 1.126 2016/11/18 06:50:04 knakahara Exp $");
66
67#ifdef _KERNEL_OPT
68#include "opt_inet.h"
69#include "opt_inet_csum.h"
70#include "opt_ipsec.h"
71#include "opt_net_mpsafe.h"
72#endif
73
74#include <sys/param.h>
75#include <sys/mbuf.h>
76#include <sys/protosw.h>
77#include <sys/socket.h>
78#include <sys/socketvar.h>
79#include <sys/systm.h>
80#include <sys/proc.h>
81#include <sys/syslog.h>
82#include <sys/domain.h>
83#include <sys/sysctl.h>
84
85#include <net/if.h>
86#include <net/if_types.h>
87
88#include <netinet/in.h>
89#include <netinet/in_var.h>
90#include <netinet/in_systm.h>
91#include <netinet/in_offload.h>
92#include <netinet/ip.h>
93#include <netinet/ip_var.h>
94#include <netinet/in_pcb.h>
95#include <netinet/udp.h>
96#include <netinet/udp_var.h>
97#include <netinet/udp_private.h>
98
99#include <netinet/ip6.h>
100#include <netinet/icmp6.h>
101#include <netinet6/ip6_var.h>
102#include <netinet6/ip6_private.h>
103#include <netinet6/in6_pcb.h>
104#include <netinet6/udp6_var.h>
105#include <netinet6/udp6_private.h>
106#include <netinet6/ip6protosw.h>
107#include <netinet6/scope6_var.h>
108
109#ifdef IPSEC
110#include <netipsec/ipsec.h>
111#include <netipsec/ipsec_var.h>
112#include <netipsec/ipsec_private.h>
113#ifdef INET6
114#include <netipsec/ipsec6.h>
115#endif
116#endif /* IPSEC */
117
118#include "faith.h"
119#if defined(NFAITH) && NFAITH > 0
120#include <net/if_faith.h>
121#endif
122
123/*
124 * UDP protocol implementation.
125 * Per RFC 768, August, 1980.
126 */
127
128extern struct inpcbtable udbtable;
129
130percpu_t *udp6stat_percpu;
131
132/* UDP on IP6 parameters */
133static int udp6_sendspace = 9216; /* really max datagram size */
134static int udp6_recvspace = 40 * (1024 + sizeof(struct sockaddr_in6));
135 /* 40 1K datagrams */
136
137static void udp6_notify(struct in6pcb *, int);
138static void sysctl_net_inet6_udp6_setup(struct sysctllog **);
139
140#ifdef UDP_CSUM_COUNTERS
141#include <sys/device.h>
142struct evcnt udp6_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
143 NULL, "udp6", "hwcsum bad");
144struct evcnt udp6_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
145 NULL, "udp6", "hwcsum ok");
146struct evcnt udp6_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
147 NULL, "udp6", "hwcsum data");
148struct evcnt udp6_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
149 NULL, "udp6", "swcsum");
150
151EVCNT_ATTACH_STATIC(udp6_hwcsum_bad);
152EVCNT_ATTACH_STATIC(udp6_hwcsum_ok);
153EVCNT_ATTACH_STATIC(udp6_hwcsum_data);
154EVCNT_ATTACH_STATIC(udp6_swcsum);
155
156#define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
157#else
158#define UDP_CSUM_COUNTER_INCR(ev) /* nothing */
159#endif
160
161void
162udp6_init(void)
163{
164 sysctl_net_inet6_udp6_setup(NULL);
165 udp6stat_percpu = percpu_alloc(sizeof(uint64_t) * UDP6_NSTATS);
166
167 udp_init_common();
168}
169
170/*
171 * Notify a udp user of an asynchronous error;
172 * just wake up so that he can collect error status.
173 */
174static void
175udp6_notify(struct in6pcb *in6p, int errno)
176{
177 in6p->in6p_socket->so_error = errno;
178 sorwakeup(in6p->in6p_socket);
179 sowwakeup(in6p->in6p_socket);
180}
181
182void *
183udp6_ctlinput(int cmd, const struct sockaddr *sa, void *d)
184{
185 struct udphdr uh;
186 struct ip6_hdr *ip6;
187 const struct sockaddr_in6 *sa6 = (const struct sockaddr_in6 *)sa;
188 struct mbuf *m;
189 int off;
190 void *cmdarg;
191 struct ip6ctlparam *ip6cp = NULL;
192 const struct sockaddr_in6 *sa6_src = NULL;
193 void (*notify)(struct in6pcb *, int) = udp6_notify;
194 struct udp_portonly {
195 u_int16_t uh_sport;
196 u_int16_t uh_dport;
197 } *uhp;
198
199 if (sa->sa_family != AF_INET6 ||
200 sa->sa_len != sizeof(struct sockaddr_in6))
201 return NULL;
202
203 if ((unsigned)cmd >= PRC_NCMDS)
204 return NULL;
205 if (PRC_IS_REDIRECT(cmd))
206 notify = in6_rtchange, d = NULL;
207 else if (cmd == PRC_HOSTDEAD)
208 d = NULL;
209 else if (cmd == PRC_MSGSIZE) {
210 /* special code is present, see below */
211 notify = in6_rtchange;
212 }
213 else if (inet6ctlerrmap[cmd] == 0)
214 return NULL;
215
216 /* if the parameter is from icmp6, decode it. */
217 if (d != NULL) {
218 ip6cp = (struct ip6ctlparam *)d;
219 m = ip6cp->ip6c_m;
220 ip6 = ip6cp->ip6c_ip6;
221 off = ip6cp->ip6c_off;
222 cmdarg = ip6cp->ip6c_cmdarg;
223 sa6_src = ip6cp->ip6c_src;
224 } else {
225 m = NULL;
226 ip6 = NULL;
227 cmdarg = NULL;
228 sa6_src = &sa6_any;
229 off = 0;
230 }
231
232 if (ip6) {
233 /*
234 * XXX: We assume that when IPV6 is non NULL,
235 * M and OFF are valid.
236 */
237
238 /* check if we can safely examine src and dst ports */
239 if (m->m_pkthdr.len < off + sizeof(*uhp)) {
240 if (cmd == PRC_MSGSIZE)
241 icmp6_mtudisc_update((struct ip6ctlparam *)d, 0);
242 return NULL;
243 }
244
245 memset(&uh, 0, sizeof(uh));
246 m_copydata(m, off, sizeof(*uhp), (void *)&uh);
247
248 if (cmd == PRC_MSGSIZE) {
249 int valid = 0;
250
251 /*
252 * Check to see if we have a valid UDP socket
253 * corresponding to the address in the ICMPv6 message
254 * payload.
255 */
256 if (in6_pcblookup_connect(&udbtable, &sa6->sin6_addr,
257 uh.uh_dport, (const struct in6_addr *)&sa6_src->sin6_addr,
258 uh.uh_sport, 0, 0))
259 valid++;
260#if 0
261 /*
262 * As the use of sendto(2) is fairly popular,
263 * we may want to allow non-connected pcb too.
264 * But it could be too weak against attacks...
265 * We should at least check if the local address (= s)
266 * is really ours.
267 */
268 else if (in6_pcblookup_bind(&udbtable, &sa6->sin6_addr,
269 uh.uh_dport, 0))
270 valid++;
271#endif
272
273 /*
274 * Depending on the value of "valid" and routing table
275 * size (mtudisc_{hi,lo}wat), we will:
276 * - recalculate the new MTU and create the
277 * corresponding routing entry, or
278 * - ignore the MTU change notification.
279 */
280 icmp6_mtudisc_update((struct ip6ctlparam *)d, valid);
281
282 /*
283 * regardless of if we called
284 * icmp6_mtudisc_update(), we need to call
285 * in6_pcbnotify(), to notify path MTU change
286 * to the userland (RFC3542), because some
287 * unconnected sockets may share the same
288 * destination and want to know the path MTU.
289 */
290 }
291
292 (void) in6_pcbnotify(&udbtable, sa, uh.uh_dport,
293 sin6tocsa(sa6_src), uh.uh_sport, cmd, cmdarg,
294 notify);
295 } else {
296 (void) in6_pcbnotify(&udbtable, sa, 0,
297 sin6tocsa(sa6_src), 0, cmd, cmdarg, notify);
298 }
299 return NULL;
300}
301
302int
303udp6_ctloutput(int op, struct socket *so, struct sockopt *sopt)
304{
305 int s;
306 int error = 0;
307 int family;
308
309 family = so->so_proto->pr_domain->dom_family;
310
311 s = splsoftnet();
312 switch (family) {
313#ifdef INET
314 case PF_INET:
315 if (sopt->sopt_level != IPPROTO_UDP) {
316 error = ip_ctloutput(op, so, sopt);
317 goto end;
318 }
319 break;
320#endif
321#ifdef INET6
322 case PF_INET6:
323 if (sopt->sopt_level != IPPROTO_UDP) {
324 error = ip6_ctloutput(op, so, sopt);
325 goto end;
326 }
327 break;
328#endif
329 default:
330 error = EAFNOSUPPORT;
331 goto end;
332 }
333 error = EINVAL;
334
335end:
336 splx(s);
337 return error;
338}
339
340static void
341udp6_sendup(struct mbuf *m, int off /* offset of data portion */,
342 struct sockaddr *src, struct socket *so)
343{
344 struct mbuf *opts = NULL;
345 struct mbuf *n;
346 struct in6pcb *in6p = NULL;
347
348 if (!so)
349 return;
350 if (so->so_proto->pr_domain->dom_family != AF_INET6)
351 return;
352 in6p = sotoin6pcb(so);
353
354#if defined(IPSEC)
355 /* check AH/ESP integrity. */
356 if (ipsec_used && so != NULL && ipsec6_in_reject_so(m, so)) {
357 IPSEC6_STATINC(IPSEC_STAT_IN_POLVIO);
358 if ((n = m_copypacket(m, M_DONTWAIT)) != NULL)
359 icmp6_error(n, ICMP6_DST_UNREACH,
360 ICMP6_DST_UNREACH_ADMIN, 0);
361 return;
362 }
363#endif /*IPSEC*/
364
365 if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) {
366 if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS
367#ifdef SO_OTIMESTAMP
368 || in6p->in6p_socket->so_options & SO_OTIMESTAMP
369#endif
370 || in6p->in6p_socket->so_options & SO_TIMESTAMP)) {
371 struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *);
372 ip6_savecontrol(in6p, &opts, ip6, n);
373 }
374
375 m_adj(n, off);
376 if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) {
377 m_freem(n);
378 if (opts)
379 m_freem(opts);
380 so->so_rcv.sb_overflowed++;
381 UDP6_STATINC(UDP6_STAT_FULLSOCK);
382 } else
383 sorwakeup(so);
384 }
385}
386
387int
388udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst,
389 struct mbuf *m, int off)
390{
391 u_int16_t sport, dport;
392 int rcvcnt;
393 struct in6_addr src6, *dst6;
394 const struct in_addr *dst4;
395 struct inpcb_hdr *inph;
396 struct in6pcb *in6p;
397
398 rcvcnt = 0;
399 off += sizeof(struct udphdr); /* now, offset of payload */
400
401 if (af != AF_INET && af != AF_INET6)
402 goto bad;
403 if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6)
404 goto bad;
405
406 src6 = src->sin6_addr;
407 if (sa6_recoverscope(src) != 0) {
408 /* XXX: should be impossible. */
409 goto bad;
410 }
411 sport = src->sin6_port;
412
413 dport = dst->sin6_port;
414 dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12];
415 dst6 = &dst->sin6_addr;
416
417 if (IN6_IS_ADDR_MULTICAST(dst6) ||
418 (af == AF_INET && IN_MULTICAST(dst4->s_addr))) {
419 /*
420 * Deliver a multicast or broadcast datagram to *all* sockets
421 * for which the local and remote addresses and ports match
422 * those of the incoming datagram. This allows more than
423 * one process to receive multi/broadcasts on the same port.
424 * (This really ought to be done for unicast datagrams as
425 * well, but that would cause problems with existing
426 * applications that open both address-specific sockets and
427 * a wildcard socket listening to the same port -- they would
428 * end up receiving duplicates of every unicast datagram.
429 * Those applications open the multiple sockets to overcome an
430 * inadequacy of the UDP socket interface, but for backwards
431 * compatibility we avoid the problem here rather than
432 * fixing the interface. Maybe 4.5BSD will remedy this?)
433 */
434
435 /*
436 * KAME note: traditionally we dropped udpiphdr from mbuf here.
437 * we need udpiphdr for IPsec processing so we do that later.
438 */
439 /*
440 * Locate pcb(s) for datagram.
441 */
442 TAILQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
443 in6p = (struct in6pcb *)inph;
444 if (in6p->in6p_af != AF_INET6)
445 continue;
446
447 if (in6p->in6p_lport != dport)
448 continue;
449 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
450 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
451 dst6))
452 continue;
453 } else {
454 if (IN6_IS_ADDR_V4MAPPED(dst6) &&
455 (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
456 continue;
457 }
458 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
459 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
460 &src6) || in6p->in6p_fport != sport)
461 continue;
462 } else {
463 if (IN6_IS_ADDR_V4MAPPED(&src6) &&
464 (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
465 continue;
466 }
467
468 udp6_sendup(m, off, sin6tosa(src), in6p->in6p_socket);
469 rcvcnt++;
470
471 /*
472 * Don't look for additional matches if this one does
473 * not have either the SO_REUSEPORT or SO_REUSEADDR
474 * socket options set. This heuristic avoids searching
475 * through all pcbs in the common case of a non-shared
476 * port. It assumes that an application will never
477 * clear these options after setting them.
478 */
479 if ((in6p->in6p_socket->so_options &
480 (SO_REUSEPORT|SO_REUSEADDR)) == 0)
481 break;
482 }
483 } else {
484 /*
485 * Locate pcb for datagram.
486 */
487 in6p = in6_pcblookup_connect(&udbtable, &src6, sport, dst6,
488 dport, 0, 0);
489 if (in6p == 0) {
490 UDP_STATINC(UDP_STAT_PCBHASHMISS);
491 in6p = in6_pcblookup_bind(&udbtable, dst6, dport, 0);
492 if (in6p == 0)
493 return rcvcnt;
494 }
495
496 udp6_sendup(m, off, sin6tosa(src), in6p->in6p_socket);
497 rcvcnt++;
498 }
499
500bad:
501 return rcvcnt;
502}
503
504int
505udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len)
506{
507
508 /*
509 * XXX it's better to record and check if this mbuf is
510 * already checked.
511 */
512
513 if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) {
514 goto good;
515 }
516 if (uh->uh_sum == 0) {
517 UDP6_STATINC(UDP6_STAT_NOSUM);
518 goto bad;
519 }
520
521 switch (m->m_pkthdr.csum_flags &
522 ((m_get_rcvif_NOMPSAFE(m)->if_csum_flags_rx & M_CSUM_UDPv6) |
523 M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
524 case M_CSUM_UDPv6|M_CSUM_TCP_UDP_BAD:
525 UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_bad);
526 UDP6_STATINC(UDP6_STAT_BADSUM);
527 goto bad;
528
529#if 0 /* notyet */
530 case M_CSUM_UDPv6|M_CSUM_DATA:
531#endif
532
533 case M_CSUM_UDPv6:
534 /* Checksum was okay. */
535 UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_ok);
536 break;
537
538 default:
539 /*
540 * Need to compute it ourselves. Maybe skip checksum
541 * on loopback interfaces.
542 */
543 UDP_CSUM_COUNTER_INCR(&udp6_swcsum);
544 if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) {
545 UDP6_STATINC(UDP6_STAT_BADSUM);
546 goto bad;
547 }
548 }
549
550good:
551 return 0;
552bad:
553 return -1;
554}
555
556int
557udp6_input(struct mbuf **mp, int *offp, int proto)
558{
559 struct mbuf *m = *mp;
560 int off = *offp;
561 struct sockaddr_in6 src, dst;
562 struct ip6_hdr *ip6;
563 struct udphdr *uh;
564 u_int32_t plen, ulen;
565
566 ip6 = mtod(m, struct ip6_hdr *);
567
568#if defined(NFAITH) && 0 < NFAITH
569 if (faithprefix(&ip6->ip6_dst)) {
570 /* send icmp6 host unreach? */
571 m_freem(m);
572 return IPPROTO_DONE;
573 }
574#endif
575
576 UDP6_STATINC(UDP6_STAT_IPACKETS);
577
578 /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */
579 plen = m->m_pkthdr.len - off;
580 IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr));
581 if (uh == NULL) {
582 IP6_STATINC(IP6_STAT_TOOSHORT);
583 return IPPROTO_DONE;
584 }
585 /*
586 * Enforce alignment requirements that are violated in
587 * some cases, see kern/50766 for details.
588 */
589 if (UDP_HDR_ALIGNED_P(uh) == 0) {
590 m = m_copyup(m, off + sizeof(struct udphdr), 0);
591 if (m == NULL) {
592 IP6_STATINC(IP6_STAT_TOOSHORT);
593 return IPPROTO_DONE;
594 }
595 ip6 = mtod(m, struct ip6_hdr *);
596 uh = (struct udphdr *)(mtod(m, char *) + off);
597 }
598 KASSERT(UDP_HDR_ALIGNED_P(uh));
599 ulen = ntohs((u_short)uh->uh_ulen);
600 /*
601 * RFC2675 section 4: jumbograms will have 0 in the UDP header field,
602 * iff payload length > 0xffff.
603 */
604 if (ulen == 0 && plen > 0xffff)
605 ulen = plen;
606
607 if (plen != ulen) {
608 UDP6_STATINC(UDP6_STAT_BADLEN);
609 goto bad;
610 }
611
612 /* destination port of 0 is illegal, based on RFC768. */
613 if (uh->uh_dport == 0)
614 goto bad;
615
616 /* Be proactive about malicious use of IPv4 mapped address */
617 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
618 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
619 /* XXX stat */
620 goto bad;
621 }
622
623 /*
624 * Checksum extended UDP header and data. Maybe skip checksum
625 * on loopback interfaces.
626 */
627 if (udp6_input_checksum(m, uh, off, ulen))
628 goto bad;
629
630 /*
631 * Construct source and dst sockaddrs.
632 */
633 memset(&src, 0, sizeof(src));
634 src.sin6_family = AF_INET6;
635 src.sin6_len = sizeof(struct sockaddr_in6);
636 src.sin6_addr = ip6->ip6_src;
637 src.sin6_port = uh->uh_sport;
638 memset(&dst, 0, sizeof(dst));
639 dst.sin6_family = AF_INET6;
640 dst.sin6_len = sizeof(struct sockaddr_in6);
641 dst.sin6_addr = ip6->ip6_dst;
642 dst.sin6_port = uh->uh_dport;
643
644 if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) {
645 if (m->m_flags & M_MCAST) {
646 UDP6_STATINC(UDP6_STAT_NOPORTMCAST);
647 goto bad;
648 }
649 UDP6_STATINC(UDP6_STAT_NOPORT);
650 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
651 m = NULL;
652 }
653
654bad:
655 if (m)
656 m_freem(m);
657 return IPPROTO_DONE;
658}
659
660static int
661udp6_attach(struct socket *so, int proto)
662{
663 struct in6pcb *in6p;
664 int s, error;
665
666 KASSERT(sotoin6pcb(so) == NULL);
667 sosetlock(so);
668
669 /*
670 * MAPPED_ADDR implementation spec:
671 * Always attach for IPv6, and only when necessary for IPv4.
672 */
673 s = splsoftnet();
674 error = in6_pcballoc(so, &udbtable);
675 splx(s);
676 if (error) {
677 return error;
678 }
679 error = soreserve(so, udp6_sendspace, udp6_recvspace);
680 if (error) {
681 return error;
682 }
683 in6p = sotoin6pcb(so);
684 in6p->in6p_cksum = -1; /* just to be sure */
685
686 KASSERT(solocked(so));
687 return 0;
688}
689
690static void
691udp6_detach(struct socket *so)
692{
693 struct in6pcb *in6p = sotoin6pcb(so);
694 int s;
695
696 KASSERT(solocked(so));
697 KASSERT(in6p != NULL);
698
699 s = splsoftnet();
700 in6_pcbdetach(in6p);
701 splx(s);
702}
703
704static int
705udp6_accept(struct socket *so, struct sockaddr *nam)
706{
707 KASSERT(solocked(so));
708
709 return EOPNOTSUPP;
710}
711
712static int
713udp6_bind(struct socket *so, struct sockaddr *nam, struct lwp *l)
714{
715 struct in6pcb *in6p = sotoin6pcb(so);
716 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
717 int error = 0;
718 int s;
719
720 KASSERT(solocked(so));
721 KASSERT(in6p != NULL);
722
723 s = splsoftnet();
724 error = in6_pcbbind(in6p, sin6, l);
725 splx(s);
726 return error;
727}
728
729static int
730udp6_listen(struct socket *so, struct lwp *l)
731{
732 KASSERT(solocked(so));
733
734 return EOPNOTSUPP;
735}
736
737static int
738udp6_connect(struct socket *so, struct sockaddr *nam, struct lwp *l)
739{
740 struct in6pcb *in6p = sotoin6pcb(so);
741 int error = 0;
742 int s;
743
744 KASSERT(solocked(so));
745 KASSERT(in6p != NULL);
746
747 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr))
748 return EISCONN;
749 s = splsoftnet();
750 error = in6_pcbconnect(in6p, (struct sockaddr_in6 *)nam, l);
751 splx(s);
752 if (error == 0)
753 soisconnected(so);
754
755 return error;
756}
757
758static int
759udp6_connect2(struct socket *so, struct socket *so2)
760{
761 KASSERT(solocked(so));
762
763 return EOPNOTSUPP;
764}
765
766static int
767udp6_disconnect(struct socket *so)
768{
769 struct in6pcb *in6p = sotoin6pcb(so);
770 int s;
771
772 KASSERT(solocked(so));
773 KASSERT(in6p != NULL);
774
775 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr))
776 return ENOTCONN;
777
778 s = splsoftnet();
779 in6_pcbdisconnect(in6p);
780 memset((void *)&in6p->in6p_laddr, 0, sizeof(in6p->in6p_laddr));
781 splx(s);
782
783 so->so_state &= ~SS_ISCONNECTED; /* XXX */
784 in6_pcbstate(in6p, IN6P_BOUND); /* XXX */
785 return 0;
786}
787
788static int
789udp6_shutdown(struct socket *so)
790{
791 int s;
792
793 s = splsoftnet();
794 socantsendmore(so);
795 splx(s);
796
797 return 0;
798}
799
800static int
801udp6_abort(struct socket *so)
802{
803 int s;
804
805 KASSERT(solocked(so));
806 KASSERT(sotoin6pcb(so) != NULL);
807
808 s = splsoftnet();
809 soisdisconnected(so);
810 in6_pcbdetach(sotoin6pcb(so));
811 splx(s);
812
813 return 0;
814}
815
816static int
817udp6_ioctl(struct socket *so, u_long cmd, void *addr6, struct ifnet *ifp)
818{
819 /*
820 * MAPPED_ADDR implementation info:
821 * Mapped addr support for PRU_CONTROL is not necessary.
822 * Because typical user of PRU_CONTROL is such as ifconfig,
823 * and they don't associate any addr to their socket. Then
824 * socket family is only hint about the PRU_CONTROL'ed address
825 * family, especially when getting addrs from kernel.
826 * So AF_INET socket need to be used to control AF_INET addrs,
827 * and AF_INET6 socket for AF_INET6 addrs.
828 */
829 return in6_control(so, cmd, addr6, ifp);
830}
831
832static int
833udp6_stat(struct socket *so, struct stat *ub)
834{
835 KASSERT(solocked(so));
836
837 /* stat: don't bother with a blocksize */
838 return 0;
839}
840
841static int
842udp6_peeraddr(struct socket *so, struct sockaddr *nam)
843{
844 KASSERT(solocked(so));
845 KASSERT(sotoin6pcb(so) != NULL);
846 KASSERT(nam != NULL);
847
848 in6_setpeeraddr(sotoin6pcb(so), (struct sockaddr_in6 *)nam);
849 return 0;
850}
851
852static int
853udp6_sockaddr(struct socket *so, struct sockaddr *nam)
854{
855 KASSERT(solocked(so));
856 KASSERT(sotoin6pcb(so) != NULL);
857 KASSERT(nam != NULL);
858
859 in6_setsockaddr(sotoin6pcb(so), (struct sockaddr_in6 *)nam);
860 return 0;
861}
862
863static int
864udp6_rcvd(struct socket *so, int flags, struct lwp *l)
865{
866 KASSERT(solocked(so));
867
868 return EOPNOTSUPP;
869}
870
871static int
872udp6_recvoob(struct socket *so, struct mbuf *m, int flags)
873{
874 KASSERT(solocked(so));
875
876 return EOPNOTSUPP;
877}
878
879static int
880udp6_send(struct socket *so, struct mbuf *m, struct sockaddr *nam,
881 struct mbuf *control, struct lwp *l)
882{
883 struct in6pcb *in6p = sotoin6pcb(so);
884 int error = 0;
885 int s;
886
887 KASSERT(solocked(so));
888 KASSERT(in6p != NULL);
889 KASSERT(m != NULL);
890
891 s = splsoftnet();
892 error = udp6_output(in6p, m, (struct sockaddr_in6 *)nam, control, l);
893 splx(s);
894
895 return error;
896}
897
898static int
899udp6_sendoob(struct socket *so, struct mbuf *m, struct mbuf *control)
900{
901 KASSERT(solocked(so));
902
903 if (m)
904 m_freem(m);
905 if (control)
906 m_freem(control);
907
908 return EOPNOTSUPP;
909}
910
911static int
912udp6_purgeif(struct socket *so, struct ifnet *ifp)
913{
914
915#ifndef NET_MPSAFE
916 mutex_enter(softnet_lock);
917#endif
918 in6_pcbpurgeif0(&udbtable, ifp);
919 in6_purgeif(ifp);
920 in6_pcbpurgeif(&udbtable, ifp);
921#ifndef NET_MPSAFE
922 mutex_exit(softnet_lock);
923#endif
924
925 return 0;
926}
927
928static int
929sysctl_net_inet6_udp6_stats(SYSCTLFN_ARGS)
930{
931
932 return (NETSTAT_SYSCTL(udp6stat_percpu, UDP6_NSTATS));
933}
934
935static void
936sysctl_net_inet6_udp6_setup(struct sysctllog **clog)
937{
938
939 sysctl_createv(clog, 0, NULL, NULL,
940 CTLFLAG_PERMANENT,
941 CTLTYPE_NODE, "inet6", NULL,
942 NULL, 0, NULL, 0,
943 CTL_NET, PF_INET6, CTL_EOL);
944 sysctl_createv(clog, 0, NULL, NULL,
945 CTLFLAG_PERMANENT,
946 CTLTYPE_NODE, "udp6",
947 SYSCTL_DESCR("UDPv6 related settings"),
948 NULL, 0, NULL, 0,
949 CTL_NET, PF_INET6, IPPROTO_UDP, CTL_EOL);
950
951 sysctl_createv(clog, 0, NULL, NULL,
952 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
953 CTLTYPE_INT, "sendspace",
954 SYSCTL_DESCR("Default UDP send buffer size"),
955 NULL, 0, &udp6_sendspace, 0,
956 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_SENDSPACE,
957 CTL_EOL);
958 sysctl_createv(clog, 0, NULL, NULL,
959 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
960 CTLTYPE_INT, "recvspace",
961 SYSCTL_DESCR("Default UDP receive buffer size"),
962 NULL, 0, &udp6_recvspace, 0,
963 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_RECVSPACE,
964 CTL_EOL);
965 sysctl_createv(clog, 0, NULL, NULL,
966 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
967 CTLTYPE_INT, "do_loopback_cksum",
968 SYSCTL_DESCR("Perform UDP checksum on loopback"),
969 NULL, 0, &udp_do_loopback_cksum, 0,
970 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_LOOPBACKCKSUM,
971 CTL_EOL);
972 sysctl_createv(clog, 0, NULL, NULL,
973 CTLFLAG_PERMANENT,
974 CTLTYPE_STRUCT, "pcblist",
975 SYSCTL_DESCR("UDP protocol control block list"),
976 sysctl_inpcblist, 0, &udbtable, 0,
977 CTL_NET, PF_INET6, IPPROTO_UDP, CTL_CREATE,
978 CTL_EOL);
979 sysctl_createv(clog, 0, NULL, NULL,
980 CTLFLAG_PERMANENT,
981 CTLTYPE_STRUCT, "stats",
982 SYSCTL_DESCR("UDPv6 statistics"),
983 sysctl_net_inet6_udp6_stats, 0, NULL, 0,
984 CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_STATS,
985 CTL_EOL);
986}
987
988void
989udp6_statinc(u_int stat)
990{
991
992 KASSERT(stat < UDP6_NSTATS);
993 UDP6_STATINC(stat);
994}
995
996PR_WRAP_USRREQS(udp6)
997#define udp6_attach udp6_attach_wrapper
998#define udp6_detach udp6_detach_wrapper
999#define udp6_accept udp6_accept_wrapper
1000#define udp6_bind udp6_bind_wrapper
1001#define udp6_listen udp6_listen_wrapper
1002#define udp6_connect udp6_connect_wrapper
1003#define udp6_connect2 udp6_connect2_wrapper
1004#define udp6_disconnect udp6_disconnect_wrapper
1005#define udp6_shutdown udp6_shutdown_wrapper
1006#define udp6_abort udp6_abort_wrapper
1007#define udp6_ioctl udp6_ioctl_wrapper
1008#define udp6_stat udp6_stat_wrapper
1009#define udp6_peeraddr udp6_peeraddr_wrapper
1010#define udp6_sockaddr udp6_sockaddr_wrapper
1011#define udp6_rcvd udp6_rcvd_wrapper
1012#define udp6_recvoob udp6_recvoob_wrapper
1013#define udp6_send udp6_send_wrapper
1014#define udp6_sendoob udp6_sendoob_wrapper
1015#define udp6_purgeif udp6_purgeif_wrapper
1016
1017const struct pr_usrreqs udp6_usrreqs = {
1018 .pr_attach = udp6_attach,
1019 .pr_detach = udp6_detach,
1020 .pr_accept = udp6_accept,
1021 .pr_bind = udp6_bind,
1022 .pr_listen = udp6_listen,
1023 .pr_connect = udp6_connect,
1024 .pr_connect2 = udp6_connect2,
1025 .pr_disconnect = udp6_disconnect,
1026 .pr_shutdown = udp6_shutdown,
1027 .pr_abort = udp6_abort,
1028 .pr_ioctl = udp6_ioctl,
1029 .pr_stat = udp6_stat,
1030 .pr_peeraddr = udp6_peeraddr,
1031 .pr_sockaddr = udp6_sockaddr,
1032 .pr_rcvd = udp6_rcvd,
1033 .pr_recvoob = udp6_recvoob,
1034 .pr_send = udp6_send,
1035 .pr_sendoob = udp6_sendoob,
1036 .pr_purgeif = udp6_purgeif,
1037};
1038