1 /* $KAME: if.c,v 1.17 2001/01/21 15:27:30 itojun Exp $ */
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * $FreeBSD: src/usr.sbin/rtadvd/if.c,v 1.2.2.3 2001/07/03 11:02:14 ume Exp $
34 #include <sys/param.h>
35 #include <sys/socket.h>
36 #include <sys/sysctl.h>
37 #include <sys/ioctl.h>
39 #include <net/if_types.h>
41 # include <net/ethernet.h>
45 #include <net/if_ether.h>
47 #include <net/route.h>
48 #include <net/if_dl.h>
49 #include <netinet/in.h>
50 #include <netinet/icmp6.h>
52 # include <netinet/if_ether.h>
55 #include <netinet/if_ether.h>
65 #define ROUNDUP(a, size) \
66 (((a) & ((size)-1)) ? (1 + ((a) | ((size)-1))) : (a))
68 #define NEXT_SA(ap) (ap) = (struct sockaddr *) \
69 ((caddr_t)(ap) + ((ap)->sa_len ? ROUNDUP((ap)->sa_len,\
73 struct if_msghdr **iflist;
78 static void get_iflist __P((char **buf, size_t *size));
79 static void parse_iflist __P((struct if_msghdr ***ifmlist_p, char *buf,
83 get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
87 for (i = 0; i < RTAX_MAX; i++) {
88 if (addrs & (1 << i)) {
98 if_nametosdl(char *name)
100 int mib[6] = {CTL_NET, AF_ROUTE, 0, 0, NET_RT_IFLIST, 0};
101 char *buf, *next, *lim;
103 struct if_msghdr *ifm;
104 struct sockaddr *sa, *rti_info[RTAX_MAX];
105 struct sockaddr_dl *sdl = NULL, *ret_sdl;
107 if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
109 if ((buf = malloc(len)) == NULL)
111 if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
117 for (next = buf; next < lim; next += ifm->ifm_msglen) {
118 ifm = (struct if_msghdr *)next;
119 if (ifm->ifm_type == RTM_IFINFO) {
120 sa = (struct sockaddr *)(ifm + 1);
121 get_rtaddrs(ifm->ifm_addrs, sa, rti_info);
122 if ((sa = rti_info[RTAX_IFP]) != NULL) {
123 if (sa->sa_family == AF_LINK) {
124 sdl = (struct sockaddr_dl *)sa;
125 if (strlen(name) != sdl->sdl_nlen)
126 continue; /* not same len */
127 if (strncmp(&sdl->sdl_data[0],
129 sdl->sdl_nlen) == 0) {
142 if ((ret_sdl = malloc(sdl->sdl_len)) == NULL)
144 memcpy((caddr_t)ret_sdl, (caddr_t)sdl, sdl->sdl_len);
149 if_getmtu(char *name)
151 struct ifaddrs *ifap, *ifa;
155 if (getifaddrs(&ifap) < 0)
157 for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
158 if (strcmp(ifa->ifa_name, name) == 0) {
167 #ifdef SIOCGIFMTU /* XXX: this ifdef may not be necessary */
172 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0)
175 ifr.ifr_addr.sa_family = AF_INET6;
176 strncpy(ifr.ifr_name, name,
177 sizeof(ifr.ifr_name));
178 if (ioctl(s, SIOCGIFMTU, (caddr_t)&ifr) < 0) {
191 /* give interface index and its old flags, then new flags returned */
193 if_getflags(int ifindex, int oifflags)
198 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
199 syslog(LOG_ERR, "<%s> socket: %s", __FUNCTION__,
201 return (oifflags & ~IFF_UP);
204 if_indextoname(ifindex, ifr.ifr_name);
205 if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
206 syslog(LOG_ERR, "<%s> ioctl:SIOCGIFFLAGS: failed for %s",
207 __FUNCTION__, ifr.ifr_name);
209 return (oifflags & ~IFF_UP);
212 return (ifr.ifr_flags);
215 #define ROUNDUP8(a) (1 + (((a) - 1) | 7))
217 lladdropt_length(struct sockaddr_dl *sdl)
219 switch(sdl->sdl_type) {
221 return(ROUNDUP8(ETHER_ADDR_LEN + 2));
228 lladdropt_fill(struct sockaddr_dl *sdl, struct nd_opt_hdr *ndopt)
232 ndopt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; /* fixed */
234 switch(sdl->sdl_type) {
236 ndopt->nd_opt_len = (ROUNDUP8(ETHER_ADDR_LEN + 2)) >> 3;
237 addr = (char *)(ndopt + 1);
238 memcpy(addr, LLADDR(sdl), ETHER_ADDR_LEN);
242 "<%s> unsupported link type(%d)",
243 __FUNCTION__, sdl->sdl_type);
255 int mib[6] = {CTL_NET, AF_ROUTE, 0, AF_INET6, NET_RT_DUMP, 0};
257 if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
263 #define FILTER_MATCH(type, filter) ((0x1 << type) & filter)
264 #define SIN6(s) ((struct sockaddr_in6 *)(s))
265 #define SDL(s) ((struct sockaddr_dl *)(s))
267 get_next_msg(char *buf, char *lim, int ifindex, size_t *lenp, int filter)
269 struct rt_msghdr *rtm;
270 struct ifa_msghdr *ifam;
271 struct sockaddr *sa, *dst, *gw, *ifa, *rti_info[RTAX_MAX];
274 for (rtm = (struct rt_msghdr *)buf;
275 rtm < (struct rt_msghdr *)lim;
276 rtm = (struct rt_msghdr *)(((char *)rtm) + rtm->rtm_msglen)) {
277 /* just for safety */
278 if (!rtm->rtm_msglen) {
279 syslog(LOG_WARNING, "<%s> rtm_msglen is 0 "
280 "(buf=%p lim=%p rtm=%p)", __FUNCTION__,
284 if (FILTER_MATCH(rtm->rtm_type, filter) == 0) {
288 switch (rtm->rtm_type) {
292 /* address related checks */
293 sa = (struct sockaddr *)(rtm + 1);
294 get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
295 if ((dst = rti_info[RTAX_DST]) == NULL ||
296 dst->sa_family != AF_INET6)
299 if (IN6_IS_ADDR_LINKLOCAL(&SIN6(dst)->sin6_addr) ||
300 IN6_IS_ADDR_MULTICAST(&SIN6(dst)->sin6_addr))
303 if ((gw = rti_info[RTAX_GATEWAY]) == NULL ||
304 gw->sa_family != AF_LINK)
306 if (ifindex && SDL(gw)->sdl_index != ifindex)
309 if (rti_info[RTAX_NETMASK] == NULL)
313 *lenp = rtm->rtm_msglen;
318 ifam = (struct ifa_msghdr *)rtm;
320 /* address related checks */
321 sa = (struct sockaddr *)(ifam + 1);
322 get_rtaddrs(ifam->ifam_addrs, sa, rti_info);
323 if ((ifa = rti_info[RTAX_IFA]) == NULL ||
324 (ifa->sa_family != AF_INET &&
325 ifa->sa_family != AF_INET6))
328 if (ifa->sa_family == AF_INET6 &&
329 (IN6_IS_ADDR_LINKLOCAL(&SIN6(ifa)->sin6_addr) ||
330 IN6_IS_ADDR_MULTICAST(&SIN6(ifa)->sin6_addr)))
333 if (ifindex && ifam->ifam_index != ifindex)
337 *lenp = ifam->ifam_msglen;
342 *lenp = rtm->rtm_msglen;
355 struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
356 struct sockaddr *sa, *rti_info[RTAX_MAX];
358 sa = (struct sockaddr *)(rtm + 1);
359 get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
361 return(&SIN6(rti_info[RTAX_DST])->sin6_addr);
365 get_rtm_ifindex(char *buf)
367 struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
368 struct sockaddr *sa, *rti_info[RTAX_MAX];
370 sa = (struct sockaddr *)(rtm + 1);
371 get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
373 return(((struct sockaddr_dl *)rti_info[RTAX_GATEWAY])->sdl_index);
377 get_ifm_ifindex(char *buf)
379 struct if_msghdr *ifm = (struct if_msghdr *)buf;
381 return ((int)ifm->ifm_index);
385 get_ifam_ifindex(char *buf)
387 struct ifa_msghdr *ifam = (struct ifa_msghdr *)buf;
389 return ((int)ifam->ifam_index);
393 get_ifm_flags(char *buf)
395 struct if_msghdr *ifm = (struct if_msghdr *)buf;
397 return (ifm->ifm_flags);
401 get_prefixlen(char *buf)
403 struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
404 struct sockaddr *sa, *rti_info[RTAX_MAX];
407 sa = (struct sockaddr *)(rtm + 1);
408 get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
409 sa = rti_info[RTAX_NETMASK];
411 p = (u_char *)(&SIN6(sa)->sin6_addr);
412 lim = (u_char *)sa + sa->sa_len;
413 return prefixlen(p, lim);
417 prefixlen(u_char *p, u_char *lim)
421 for (masklen = 0; p < lim; p++) {
458 rtmsg_type(char *buf)
460 struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
462 return(rtm->rtm_type);
468 struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
470 return(rtm->rtm_msglen);
476 struct if_msghdr *ifm = (struct if_msghdr *)buf;
478 return(ifm->ifm_msglen);
482 * alloc buffer and get if_msghdrs block from kernel,
483 * and put them into the buffer
486 get_iflist(char **buf, size_t *size)
494 mib[4] = NET_RT_IFLIST;
497 if (sysctl(mib, 6, NULL, size, NULL, 0) < 0) {
498 syslog(LOG_ERR, "<%s> sysctl: iflist size get failed",
502 if ((*buf = malloc(*size)) == NULL) {
503 syslog(LOG_ERR, "<%s> malloc failed", __FUNCTION__);
506 if (sysctl(mib, 6, *buf, size, NULL, 0) < 0) {
507 syslog(LOG_ERR, "<%s> sysctl: iflist get failed",
515 * alloc buffer and parse if_msghdrs block passed as arg,
516 * and init the buffer as list of pointers ot each of the if_msghdr.
519 parse_iflist(struct if_msghdr ***ifmlist_p, char *buf, size_t bufsize)
521 int iflentry_size, malloc_size;
522 struct if_msghdr *ifm;
523 struct ifa_msghdr *ifam;
527 * Estimate least size of an iflist entry, to be obtained from kernel.
528 * Should add sizeof(sockaddr) ??
530 iflentry_size = sizeof(struct if_msghdr);
531 /* roughly estimate max list size of pointers to each if_msghdr */
532 malloc_size = (bufsize/iflentry_size) * sizeof(size_t);
533 if ((*ifmlist_p = (struct if_msghdr **)malloc(malloc_size)) == NULL) {
534 syslog(LOG_ERR, "<%s> malloc failed", __FUNCTION__);
539 for (ifm = (struct if_msghdr *)buf; ifm < (struct if_msghdr *)lim;) {
540 if (ifm->ifm_msglen == 0) {
541 syslog(LOG_WARNING, "<%s> ifm_msglen is 0 "
542 "(buf=%p lim=%p ifm=%p)", __FUNCTION__,
547 if (ifm->ifm_type == RTM_IFINFO) {
548 (*ifmlist_p)[ifm->ifm_index] = ifm;
550 syslog(LOG_ERR, "out of sync parsing NET_RT_IFLIST\n"
551 "expected %d, got %d\n msglen = %d\n"
552 "buf:%p, ifm:%p, lim:%p\n",
553 RTM_IFINFO, ifm->ifm_type, ifm->ifm_msglen,
557 for (ifam = (struct ifa_msghdr *)
558 ((char *)ifm + ifm->ifm_msglen);
559 ifam < (struct ifa_msghdr *)lim;
560 ifam = (struct ifa_msghdr *)
561 ((char *)ifam + ifam->ifam_msglen)) {
562 /* just for safety */
563 if (!ifam->ifam_msglen) {
564 syslog(LOG_WARNING, "<%s> ifa_msglen is 0 "
565 "(buf=%p lim=%p ifam=%p)", __FUNCTION__,
569 if (ifam->ifam_type != RTM_NEWADDR)
572 ifm = (struct if_msghdr *)ifam;
585 /* get iflist block from kernel */
586 get_iflist(&ifblock, &ifblock_size);
588 /* make list of pointers to each if_msghdr */
589 parse_iflist(&iflist, ifblock, ifblock_size);