2 /* $KAME: if.c,v 1.17 2001/01/21 15:27:30 itojun Exp $ */
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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
33 #include <sys/param.h>
34 #include <sys/socket.h>
35 #include <sys/sysctl.h>
36 #include <sys/ioctl.h>
38 #include <net/if_types.h>
39 #include <net/ethernet.h>
41 #include <net/route.h>
42 #include <net/if_dl.h>
43 #include <netinet/in.h>
44 #include <netinet/icmp6.h>
54 #define ROUNDUP(a, size) \
55 (((a) & ((size)-1)) ? (1 + ((a) | ((size)-1))) : (a))
57 #define NEXT_SA(ap) (ap) = (struct sockaddr *) \
58 ((caddr_t)(ap) + ((ap)->sa_len ? ROUNDUP((ap)->sa_len,\
62 struct if_msghdr **iflist;
67 static void get_iflist(char **buf, size_t *size);
68 static void parse_iflist(struct if_msghdr ***ifmlist_p, char *buf,
72 get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
76 for (i = 0; i < RTAX_MAX; i++) {
77 if (addrs & (1 << i)) {
87 if_nametosdl(char *name)
89 int mib[6] = {CTL_NET, AF_ROUTE, 0, 0, NET_RT_IFLIST, 0};
90 char *buf, *next, *lim;
92 struct if_msghdr *ifm;
93 struct sockaddr *sa, *rti_info[RTAX_MAX];
94 struct sockaddr_dl *sdl = NULL, *ret_sdl;
96 if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
98 if ((buf = malloc(len)) == NULL)
100 if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
106 for (next = buf; next < lim; next += ifm->ifm_msglen) {
107 ifm = (struct if_msghdr *)next;
108 if (ifm->ifm_type == RTM_IFINFO) {
109 sa = (struct sockaddr *)(ifm + 1);
110 get_rtaddrs(ifm->ifm_addrs, sa, rti_info);
111 if ((sa = rti_info[RTAX_IFP]) != NULL) {
112 if (sa->sa_family == AF_LINK) {
113 sdl = (struct sockaddr_dl *)sa;
114 if (strlen(name) != sdl->sdl_nlen)
115 continue; /* not same len */
116 if (strncmp(&sdl->sdl_data[0],
118 sdl->sdl_nlen) == 0) {
131 if ((ret_sdl = malloc(sdl->sdl_len)) == NULL)
133 memcpy((caddr_t)ret_sdl, (caddr_t)sdl, sdl->sdl_len);
141 if_getmtu(char *name)
143 struct ifaddrs *ifap, *ifa;
147 if (getifaddrs(&ifap) < 0)
149 for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
150 if (strcmp(ifa->ifa_name, name) == 0) {
159 #ifdef SIOCGIFMTU /* XXX: this ifdef may not be necessary */
164 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0)
167 ifr.ifr_addr.sa_family = AF_INET6;
168 strncpy(ifr.ifr_name, name,
169 sizeof(ifr.ifr_name));
170 if (ioctl(s, SIOCGIFMTU, (caddr_t)&ifr) < 0) {
183 /* give interface index and its old flags, then new flags returned */
185 if_getflags(int ifindex, int oifflags)
190 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
191 syslog(LOG_ERR, "<%s> socket: %s", __func__,
193 return (oifflags & ~IFF_UP);
196 if_indextoname(ifindex, ifr.ifr_name);
197 if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
198 syslog(LOG_ERR, "<%s> ioctl:SIOCGIFFLAGS: failed for %s",
199 __func__, ifr.ifr_name);
201 return (oifflags & ~IFF_UP);
204 return (ifr.ifr_flags);
207 #define ROUNDUP8(a) (1 + (((a) - 1) | 7))
209 lladdropt_length(struct sockaddr_dl *sdl)
211 switch (sdl->sdl_type) {
213 return(ROUNDUP8(ETHER_ADDR_LEN + 2));
220 lladdropt_fill(struct sockaddr_dl *sdl, struct nd_opt_hdr *ndopt)
224 ndopt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; /* fixed */
226 switch (sdl->sdl_type) {
228 ndopt->nd_opt_len = (ROUNDUP8(ETHER_ADDR_LEN + 2)) >> 3;
229 addr = (char *)(ndopt + 1);
230 memcpy(addr, LLADDR(sdl), ETHER_ADDR_LEN);
233 syslog(LOG_ERR, "<%s> unsupported link type(%d)",
234 __func__, sdl->sdl_type);
246 int mib[6] = {CTL_NET, AF_ROUTE, 0, AF_INET6, NET_RT_DUMP, 0};
248 if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
254 #define FILTER_MATCH(type, filter) ((0x1 << type) & filter)
255 #define SIN6(s) ((struct sockaddr_in6 *)(s))
256 #define SDL(s) ((struct sockaddr_dl *)(s))
258 get_next_msg(char *buf, char *lim, int ifindex, size_t *lenp, int filter)
260 struct rt_msghdr *rtm;
261 struct ifa_msghdr *ifam;
262 struct sockaddr *sa, *dst, *gw, *ifa, *rti_info[RTAX_MAX];
265 for (rtm = (struct rt_msghdr *)buf;
266 rtm < (struct rt_msghdr *)lim;
267 rtm = (struct rt_msghdr *)(((char *)rtm) + rtm->rtm_msglen)) {
268 /* just for safety */
269 if (!rtm->rtm_msglen) {
270 syslog(LOG_WARNING, "<%s> rtm_msglen is 0 "
271 "(buf=%p lim=%p rtm=%p)", __func__,
275 if (FILTER_MATCH(rtm->rtm_type, filter) == 0) {
279 switch (rtm->rtm_type) {
283 /* address related checks */
284 sa = (struct sockaddr *)(rtm + 1);
285 get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
286 if ((dst = rti_info[RTAX_DST]) == NULL ||
287 dst->sa_family != AF_INET6)
290 if (IN6_IS_ADDR_LINKLOCAL(&SIN6(dst)->sin6_addr) ||
291 IN6_IS_ADDR_MULTICAST(&SIN6(dst)->sin6_addr))
294 if ((gw = rti_info[RTAX_GATEWAY]) == NULL ||
295 gw->sa_family != AF_LINK)
297 if (ifindex && SDL(gw)->sdl_index != ifindex)
300 if (rti_info[RTAX_NETMASK] == NULL)
304 *lenp = rtm->rtm_msglen;
309 ifam = (struct ifa_msghdr *)rtm;
311 /* address related checks */
312 sa = (struct sockaddr *)(ifam + 1);
313 get_rtaddrs(ifam->ifam_addrs, sa, rti_info);
314 if ((ifa = rti_info[RTAX_IFA]) == NULL ||
315 (ifa->sa_family != AF_INET &&
316 ifa->sa_family != AF_INET6))
319 if (ifa->sa_family == AF_INET6 &&
320 (IN6_IS_ADDR_LINKLOCAL(&SIN6(ifa)->sin6_addr) ||
321 IN6_IS_ADDR_MULTICAST(&SIN6(ifa)->sin6_addr)))
324 if (ifindex && ifam->ifam_index != ifindex)
328 *lenp = ifam->ifam_msglen;
333 *lenp = rtm->rtm_msglen;
346 struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
347 struct sockaddr *sa, *rti_info[RTAX_MAX];
349 sa = (struct sockaddr *)(rtm + 1);
350 get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
352 return(&SIN6(rti_info[RTAX_DST])->sin6_addr);
356 get_rtm_ifindex(char *buf)
358 struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
359 struct sockaddr *sa, *rti_info[RTAX_MAX];
361 sa = (struct sockaddr *)(rtm + 1);
362 get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
364 return(((struct sockaddr_dl *)rti_info[RTAX_GATEWAY])->sdl_index);
368 get_ifm_ifindex(char *buf)
370 struct if_msghdr *ifm = (struct if_msghdr *)buf;
372 return ((int)ifm->ifm_index);
376 get_ifam_ifindex(char *buf)
378 struct ifa_msghdr *ifam = (struct ifa_msghdr *)buf;
380 return ((int)ifam->ifam_index);
384 get_ifm_flags(char *buf)
386 struct if_msghdr *ifm = (struct if_msghdr *)buf;
388 return (ifm->ifm_flags);
392 get_prefixlen(char *buf)
394 struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
395 struct sockaddr *sa, *rti_info[RTAX_MAX];
398 sa = (struct sockaddr *)(rtm + 1);
399 get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
400 sa = rti_info[RTAX_NETMASK];
402 p = (u_char *)(&SIN6(sa)->sin6_addr);
403 lim = (u_char *)sa + sa->sa_len;
404 return prefixlen(p, lim);
408 prefixlen(u_char *p, u_char *lim)
412 for (masklen = 0; p < lim; p++) {
449 rtmsg_type(char *buf)
451 struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
453 return(rtm->rtm_type);
459 struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
461 return(rtm->rtm_msglen);
467 struct if_msghdr *ifm = (struct if_msghdr *)buf;
469 return(ifm->ifm_msglen);
473 * alloc buffer and get if_msghdrs block from kernel,
474 * and put them into the buffer
477 get_iflist(char **buf, size_t *size)
485 mib[4] = NET_RT_IFLIST;
488 if (sysctl(mib, 6, NULL, size, NULL, 0) < 0) {
489 syslog(LOG_ERR, "<%s> sysctl: iflist size get failed",
493 if ((*buf = malloc(*size)) == NULL) {
494 syslog(LOG_ERR, "<%s> malloc failed", __func__);
497 if (sysctl(mib, 6, *buf, size, NULL, 0) < 0) {
498 syslog(LOG_ERR, "<%s> sysctl: iflist get failed",
506 * alloc buffer and parse if_msghdrs block passed as arg,
507 * and init the buffer as list of pointers ot each of the if_msghdr.
510 parse_iflist(struct if_msghdr ***ifmlist_p, char *buf, size_t bufsize)
512 int iflentry_size, malloc_size;
513 struct if_msghdr *ifm;
514 struct ifa_msghdr *ifam;
518 * Estimate least size of an iflist entry, to be obtained from kernel.
519 * Should add sizeof(sockaddr) ??
521 iflentry_size = sizeof(struct if_msghdr);
522 /* roughly estimate max list size of pointers to each if_msghdr */
523 malloc_size = (bufsize/iflentry_size) * sizeof(size_t);
524 if ((*ifmlist_p = (struct if_msghdr **)malloc(malloc_size)) == NULL) {
525 syslog(LOG_ERR, "<%s> malloc failed", __func__);
530 for (ifm = (struct if_msghdr *)buf; ifm < (struct if_msghdr *)lim;) {
531 if (ifm->ifm_msglen == 0) {
532 syslog(LOG_WARNING, "<%s> ifm_msglen is 0 "
533 "(buf=%p lim=%p ifm=%p)", __func__,
538 if (ifm->ifm_type == RTM_IFINFO) {
539 (*ifmlist_p)[ifm->ifm_index] = ifm;
541 syslog(LOG_ERR, "out of sync parsing NET_RT_IFLIST\n"
542 "expected %d, got %d\n msglen = %d\n"
543 "buf:%p, ifm:%p, lim:%p\n",
544 RTM_IFINFO, ifm->ifm_type, ifm->ifm_msglen,
548 for (ifam = (struct ifa_msghdr *)
549 ((char *)ifm + ifm->ifm_msglen);
550 ifam < (struct ifa_msghdr *)lim;
551 ifam = (struct ifa_msghdr *)
552 ((char *)ifam + ifam->ifam_msglen)) {
553 /* just for safety */
554 if (!ifam->ifam_msglen) {
555 syslog(LOG_WARNING, "<%s> ifa_msglen is 0 "
556 "(buf=%p lim=%p ifam=%p)", __func__,
560 if (ifam->ifam_type != RTM_NEWADDR)
563 ifm = (struct if_msghdr *)ifam;
576 /* get iflist block from kernel */
577 get_iflist(&ifblock, &ifblock_size);
579 /* make list of pointers to each if_msghdr */
580 parse_iflist(&iflist, ifblock, ifblock_size);