2 /* $KAME: if.c,v 1.17 2001/01/21 15:27:30 itojun Exp $ */
5 * SPDX-License-Identifier: BSD-3-Clause
7 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
8 * Copyright (C) 2011 Hiroki Sato <hrs@FreeBSD.org>
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the project nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 #include <sys/param.h>
37 #include <sys/socket.h>
38 #include <sys/sysctl.h>
39 #include <sys/ioctl.h>
41 #include <net/if_dl.h>
42 #include <net/if_types.h>
43 #include <net/ethernet.h>
44 #include <net/route.h>
45 #include <netinet/in.h>
46 #include <netinet/in_var.h>
47 #include <netinet/ip6.h>
48 #include <netinet/icmp6.h>
49 #include <netinet6/nd6.h>
57 #include "pathnames.h"
61 #define ROUNDUP(a, size) \
62 (((a) & ((size)-1)) ? (1 + ((a) | ((size)-1))) : (a))
65 (ap) = (struct sockaddr *)((caddr_t)(ap) + \
66 ((ap)->sa_len ? ROUNDUP((ap)->sa_len, sizeof(u_long)) : \
69 struct sockaddr_in6 sin6_linklocal_allnodes = {
70 .sin6_len = sizeof(sin6_linklocal_allnodes),
71 .sin6_family = AF_INET6,
72 .sin6_addr = IN6ADDR_LINKLOCAL_ALLNODES_INIT,
75 struct sockaddr_in6 sin6_linklocal_allrouters = {
76 .sin6_len = sizeof(sin6_linklocal_allrouters),
77 .sin6_family = AF_INET6,
78 .sin6_addr = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT,
81 struct sockaddr_in6 sin6_sitelocal_allrouters = {
82 .sin6_len = sizeof(sin6_sitelocal_allrouters),
83 .sin6_family = AF_INET6,
84 .sin6_addr = IN6ADDR_SITELOCAL_ALLROUTERS_INIT,
87 struct sockinfo sock = { .si_fd = -1, .si_name = NULL };
88 struct sockinfo rtsock = { .si_fd = -1, .si_name = NULL };
89 struct sockinfo ctrlsock = { .si_fd = -1, .si_name = _PATH_CTRL_SOCK };
93 static void get_rtaddrs(int, struct sockaddr *,
95 static struct if_msghdr *get_next_msghdr(struct if_msghdr *,
99 get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
103 for (i = 0; i < RTAX_MAX; i++) {
104 if (addrs & (1 << i)) {
113 #define ROUNDUP8(a) (1 + (((a) - 1) | 7))
115 lladdropt_length(struct sockaddr_dl *sdl)
117 switch (sdl->sdl_type) {
121 return (ROUNDUP8(ETHER_ADDR_LEN + 2));
128 lladdropt_fill(struct sockaddr_dl *sdl, struct nd_opt_hdr *ndopt)
132 ndopt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; /* fixed */
134 switch (sdl->sdl_type) {
138 ndopt->nd_opt_len = (ROUNDUP8(ETHER_ADDR_LEN + 2)) >> 3;
139 addr = (char *)(ndopt + 1);
140 memcpy(addr, LLADDR(sdl), ETHER_ADDR_LEN);
143 syslog(LOG_ERR, "<%s> unsupported link type(%d)",
144 __func__, sdl->sdl_type);
155 int mib[6] = {CTL_NET, AF_ROUTE, 0, AF_INET6, NET_RT_DUMP, 0};
157 if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
163 #define FILTER_MATCH(type, filter) ((0x1 << type) & filter)
164 #define SIN6(s) ((struct sockaddr_in6 *)(s))
165 #define SDL(s) ((struct sockaddr_dl *)(s))
167 get_next_msg(char *buf, char *lim, int ifindex, size_t *lenp, int filter)
169 struct rt_msghdr *rtm;
170 struct ifa_msghdr *ifam;
171 struct sockaddr *sa, *dst, *gw, *ifa, *rti_info[RTAX_MAX];
174 for (rtm = (struct rt_msghdr *)buf;
175 rtm < (struct rt_msghdr *)lim;
176 rtm = (struct rt_msghdr *)(((char *)rtm) + rtm->rtm_msglen)) {
177 /* just for safety */
178 if (!rtm->rtm_msglen) {
179 syslog(LOG_WARNING, "<%s> rtm_msglen is 0 "
180 "(buf=%p lim=%p rtm=%p)", __func__,
184 if (((struct rt_msghdr *)buf)->rtm_version != RTM_VERSION) {
186 "<%s> routing message version mismatch "
187 "(buf=%p lim=%p rtm=%p)", __func__,
192 if (FILTER_MATCH(rtm->rtm_type, filter) == 0)
195 switch (rtm->rtm_type) {
199 /* address related checks */
200 sa = (struct sockaddr *)(rtm + 1);
201 get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
202 if ((dst = rti_info[RTAX_DST]) == NULL ||
203 dst->sa_family != AF_INET6)
206 if (IN6_IS_ADDR_LINKLOCAL(&SIN6(dst)->sin6_addr) ||
207 IN6_IS_ADDR_MULTICAST(&SIN6(dst)->sin6_addr))
210 if ((gw = rti_info[RTAX_GATEWAY]) == NULL ||
211 gw->sa_family != AF_LINK)
213 if (ifindex && SDL(gw)->sdl_index != ifindex)
216 if (rti_info[RTAX_NETMASK] == NULL)
220 *lenp = rtm->rtm_msglen;
225 ifam = (struct ifa_msghdr *)rtm;
227 /* address related checks */
228 sa = (struct sockaddr *)(ifam + 1);
229 get_rtaddrs(ifam->ifam_addrs, sa, rti_info);
230 if ((ifa = rti_info[RTAX_IFA]) == NULL ||
231 (ifa->sa_family != AF_INET &&
232 ifa->sa_family != AF_INET6))
235 if (ifa->sa_family == AF_INET6 &&
236 (IN6_IS_ADDR_LINKLOCAL(&SIN6(ifa)->sin6_addr) ||
237 IN6_IS_ADDR_MULTICAST(&SIN6(ifa)->sin6_addr)))
240 if (ifindex && ifam->ifam_index != ifindex)
244 *lenp = ifam->ifam_msglen;
250 *lenp = rtm->rtm_msglen;
256 return ((char *)rtm);
263 struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
264 struct sockaddr *sa, *rti_info[RTAX_MAX];
266 sa = (struct sockaddr *)(rtm + 1);
267 get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
269 return (&SIN6(rti_info[RTAX_DST])->sin6_addr);
273 get_rtm_ifindex(char *buf)
275 struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
276 struct sockaddr *sa, *rti_info[RTAX_MAX];
278 sa = (struct sockaddr *)(rtm + 1);
279 get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
281 return (((struct sockaddr_dl *)rti_info[RTAX_GATEWAY])->sdl_index);
285 get_prefixlen(char *buf)
287 struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
288 struct sockaddr *sa, *rti_info[RTAX_MAX];
291 sa = (struct sockaddr *)(rtm + 1);
292 get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
293 sa = rti_info[RTAX_NETMASK];
295 p = (char *)(&SIN6(sa)->sin6_addr);
296 lim = (char *)sa + sa->sa_len;
297 return prefixlen(p, lim);
301 prefixlen(unsigned char *p, unsigned char *lim)
305 for (masklen = 0; p < lim; p++) {
342 update_persist_ifinfo(struct ifilist_head_t *ifi_head, const char *ifname)
348 ifindex = if_nametoindex(ifname);
349 TAILQ_FOREACH(ifi, ifi_head, ifi_next) {
351 if (ifindex == ifi->ifi_ifindex)
354 if (strncmp(ifname, ifi->ifi_ifname,
355 sizeof(ifi->ifi_ifname)) == 0)
361 /* A new ifinfo element is needed. */
362 syslog(LOG_DEBUG, "<%s> new entry: %s", __func__,
365 ELM_MALLOC(ifi, exit(1));
366 ifi->ifi_ifindex = 0;
367 strlcpy(ifi->ifi_ifname, ifname, sizeof(ifi->ifi_ifname));
368 ifi->ifi_rainfo = NULL;
369 ifi->ifi_state = IFI_STATE_UNCONFIGURED;
370 TAILQ_INSERT_TAIL(ifi_head, ifi, ifi_next);
373 ifi->ifi_persist = 1;
375 syslog(LOG_DEBUG, "<%s> %s is marked PERSIST", __func__,
377 syslog(LOG_DEBUG, "<%s> %s is state = %d", __func__,
378 ifi->ifi_ifname, ifi->ifi_state);
383 update_ifinfo_nd_flags(struct ifinfo *ifi)
385 struct in6_ndireq nd;
389 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
391 "<%s> socket() failed.", __func__);
395 memset(&nd, 0, sizeof(nd));
396 strlcpy(nd.ifname, ifi->ifi_ifname,
398 error = ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd);
401 if (errno != EPFNOSUPPORT)
402 syslog(LOG_ERR, "<%s> ioctl() failed.", __func__);
405 ifi->ifi_nd_flags = nd.ndi.flags;
411 #define MAX_SYSCTL_TRY 5
414 update_ifinfo(struct ifilist_head_t *ifi_head, int ifindex)
416 struct if_msghdr *ifm;
417 struct ifinfo *ifi = NULL;
419 struct sockaddr *rti_info[RTAX_MAX];
423 int mib[] = { CTL_NET, PF_ROUTE, 0, AF_INET6, NET_RT_IFLIST, 0 };
426 syslog(LOG_DEBUG, "<%s> enter", __func__);
431 * We'll try to get addresses several times in case that
432 * the number of addresses is unexpectedly increased during
433 * the two sysctl calls. This should rarely happen.
434 * Portability note: since FreeBSD does not add margin of
435 * memory at the first sysctl, the possibility of failure on
436 * the second sysctl call is a bit higher.
439 if (sysctl(mib, nitems(mib), NULL, &len, NULL, 0) < 0) {
441 "<%s> sysctl: NET_RT_IFLIST size get failed",
445 if ((msg = malloc(len)) == NULL) {
446 syslog(LOG_ERR, "<%s> malloc failed", __func__);
449 if (sysctl(mib, nitems(mib), msg, &len, NULL, 0) < 0) {
450 if (errno != ENOMEM || ++ntry >= MAX_SYSCTL_TRY) {
453 "<%s> sysctl: NET_RT_IFLIST get failed",
460 } while (msg == NULL);
463 for (ifm = (struct if_msghdr *)msg;
464 ifm != NULL && ifm < (struct if_msghdr *)lim;
465 ifm = get_next_msghdr(ifm,(struct if_msghdr *)lim)) {
468 syslog(LOG_DEBUG, "<%s> ifm = %p, lim = %p, diff = %zu",
469 __func__, ifm, lim, (char *)lim - (char *)ifm);
471 if (ifm->ifm_version != RTM_VERSION) {
473 "<%s> ifm_vesrion mismatch", __func__);
476 if (ifm->ifm_msglen == 0) {
478 "<%s> ifm_msglen is 0", __func__);
484 if (ifm->ifm_type == RTM_IFINFO) {
487 char ifname[IFNAMSIZ];
489 syslog(LOG_DEBUG, "<%s> RTM_IFINFO found. "
490 "ifm_index = %d, ifindex = %d",
491 __func__, ifm->ifm_index, ifindex);
493 /* when ifindex is specified */
494 if (ifindex != UPDATE_IFINFO_ALL &&
495 ifindex != ifm->ifm_index)
499 if (if_indextoname(ifm->ifm_index, ifname) == NULL) {
501 "<%s> ifname not found (idx=%d)",
502 __func__, ifm->ifm_index);
506 /* lookup an entry with the same ifindex */
507 TAILQ_FOREACH(ifi, ifi_head, ifi_next) {
508 if (ifm->ifm_index == ifi->ifi_ifindex)
510 if (strncmp(ifname, ifi->ifi_ifname,
511 sizeof(ifname)) == 0)
516 "<%s> new entry for idx=%d",
517 __func__, ifm->ifm_index);
518 ELM_MALLOC(ifi, exit(1));
519 ifi->ifi_rainfo = NULL;
520 ifi->ifi_state = IFI_STATE_UNCONFIGURED;
521 ifi->ifi_persist = 0;
525 ifi->ifi_ifindex = ifm->ifm_index;
528 strlcpy(ifi->ifi_ifname, ifname, IFNAMSIZ);
530 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
532 "<%s> socket() failed.", __func__);
539 ifi->ifi_phymtu = ifm->ifm_data.ifi_mtu;
540 if (ifi->ifi_phymtu == 0) {
541 memset(&ifr, 0, sizeof(ifr));
542 ifr.ifr_addr.sa_family = AF_INET6;
543 strlcpy(ifr.ifr_name, ifi->ifi_ifname,
544 sizeof(ifr.ifr_name));
545 error = ioctl(s, SIOCGIFMTU, (caddr_t)&ifr);
549 "<%s> ioctl() failed.",
555 ifi->ifi_phymtu = ifr.ifr_mtu;
556 if (ifi->ifi_phymtu == 0) {
558 "<%s> no interface mtu info"
559 " on %s. %d will be used.",
560 __func__, ifi->ifi_ifname,
562 ifi->ifi_phymtu = IPV6_MMTU;
568 error = update_ifinfo_nd_flags(ifi);
576 sa = (struct sockaddr *)(ifm + 1);
577 get_rtaddrs(ifm->ifm_addrs, sa, rti_info);
578 if ((sa = rti_info[RTAX_IFP]) != NULL) {
579 if (sa->sa_family == AF_LINK) {
580 memcpy(&ifi->ifi_sdl,
581 (struct sockaddr_dl *)sa,
582 sizeof(ifi->ifi_sdl));
585 memset(&ifi->ifi_sdl, 0,
586 sizeof(ifi->ifi_sdl));
589 ifi->ifi_flags = ifm->ifm_flags;
592 ifi->ifi_type = ifm->ifm_type;
595 "out of sync parsing NET_RT_IFLIST\n"
596 "expected %d, got %d\n msglen = %d\n",
597 RTM_IFINFO, ifm->ifm_type, ifm->ifm_msglen);
603 "<%s> adding %s(idx=%d) to ifilist",
604 __func__, ifi->ifi_ifname, ifi->ifi_ifindex);
605 TAILQ_INSERT_TAIL(ifi_head, ifi, ifi_next);
610 if (mcastif != NULL) {
611 error = sock_mc_rr_update(&sock, mcastif);
619 static struct if_msghdr *
620 get_next_msghdr(struct if_msghdr *ifm, struct if_msghdr *lim)
622 struct ifa_msghdr *ifam;
624 for (ifam = (struct ifa_msghdr *)((char *)ifm + ifm->ifm_msglen);
625 ifam < (struct ifa_msghdr *)lim;
626 ifam = (struct ifa_msghdr *)((char *)ifam + ifam->ifam_msglen)) {
627 if (!ifam->ifam_msglen) {
629 "<%s> ifa_msglen is 0", __func__);
632 if (ifam->ifam_type != RTM_NEWADDR)
636 return ((struct if_msghdr *)ifam);
640 getinet6sysctl(int code)
642 int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 };
647 size = sizeof(value);
648 if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &value, &size, NULL, 0)
650 syslog(LOG_ERR, "<%s>: failed to get ip6 sysctl(%d): %s",
661 sock_mc_join(struct sockinfo *s, int ifindex)
663 struct ipv6_mreq mreq;
664 char ifname[IFNAMSIZ];
666 syslog(LOG_DEBUG, "<%s> enter", __func__);
672 * join all routers multicast address on each advertising
675 memset(&mreq, 0, sizeof(mreq));
677 memcpy(&mreq.ipv6mr_multiaddr.s6_addr,
678 &sin6_linklocal_allrouters.sin6_addr,
679 sizeof(mreq.ipv6mr_multiaddr.s6_addr));
681 mreq.ipv6mr_interface = ifindex;
682 if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq,
685 "<%s> IPV6_JOIN_GROUP(link) on %s: %s",
686 __func__, if_indextoname(ifindex, ifname),
691 "<%s> %s: join link-local all-routers MC group",
692 __func__, if_indextoname(ifindex, ifname));
698 sock_mc_leave(struct sockinfo *s, int ifindex)
700 struct ipv6_mreq mreq;
701 char ifname[IFNAMSIZ];
703 syslog(LOG_DEBUG, "<%s> enter", __func__);
709 * join all routers multicast address on each advertising
713 memset(&mreq, 0, sizeof(mreq));
715 memcpy(&mreq.ipv6mr_multiaddr.s6_addr,
716 &sin6_linklocal_allrouters.sin6_addr,
717 sizeof(mreq.ipv6mr_multiaddr.s6_addr));
719 mreq.ipv6mr_interface = ifindex;
720 if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_LEAVE_GROUP, &mreq,
723 "<%s> IPV6_JOIN_LEAVE(link) on %s: %s",
724 __func__, if_indextoname(ifindex, ifname),
729 "<%s> %s: leave link-local all-routers MC group",
730 __func__, if_indextoname(ifindex, ifname));
736 sock_mc_rr_update(struct sockinfo *s, char *mif)
738 struct ipv6_mreq mreq;
740 syslog(LOG_DEBUG, "<%s> enter", __func__);
745 * When attending router renumbering, join all-routers site-local
749 memcpy(&mreq.ipv6mr_multiaddr.s6_addr,
750 &sin6_sitelocal_allrouters.sin6_addr,
751 sizeof(mreq.ipv6mr_multiaddr.s6_addr));
752 if ((mreq.ipv6mr_interface = if_nametoindex(mif)) == 0) {
754 "<%s> invalid interface: %s",
759 if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_JOIN_GROUP,
760 &mreq, sizeof(mreq)) < 0) {
762 "<%s> IPV6_JOIN_GROUP(site) on %s: %s",
763 __func__, mif, strerror(errno));
768 "<%s> %s: join site-local all-routers MC group",