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 $
32 * $DragonFly: src/usr.sbin/rtadvd/if.c,v 1.6 2005/12/05 00:56:37 swildner Exp $
35 #include <sys/param.h>
36 #include <sys/socket.h>
37 #include <sys/sysctl.h>
38 #include <sys/ioctl.h>
40 #include <net/if_types.h>
42 # include <net/ethernet.h>
46 #include <net/if_ether.h>
48 #include <net/route.h>
49 #include <net/if_dl.h>
50 #include <netinet/in.h>
51 #include <netinet/icmp6.h>
53 # include <netinet/if_ether.h>
56 #include <netinet/if_ether.h>
66 struct if_msghdr **iflist;
71 static void get_iflist(char **buf, size_t *size);
72 static void parse_iflist(struct if_msghdr ***ifmlist_p, char *buf,
76 get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
80 for (i = 0; i < RTAX_MAX; i++) {
81 if (addrs & (1 << i)) {
91 if_nametosdl(char *name)
93 int mib[6] = {CTL_NET, AF_ROUTE, 0, 0, NET_RT_IFLIST, 0};
94 char *buf, *next, *lim;
96 struct if_msghdr *ifm;
97 struct sockaddr *sa, *rti_info[RTAX_MAX];
98 struct sockaddr_dl *sdl = NULL, *ret_sdl;
100 if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
102 if ((buf = malloc(len)) == NULL)
104 if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
110 for (next = buf; next < lim; next += ifm->ifm_msglen) {
111 ifm = (struct if_msghdr *)next;
112 if (ifm->ifm_type == RTM_IFINFO) {
113 sa = (struct sockaddr *)(ifm + 1);
114 get_rtaddrs(ifm->ifm_addrs, sa, rti_info);
115 if ((sa = rti_info[RTAX_IFP]) != NULL) {
116 if (sa->sa_family == AF_LINK) {
117 sdl = (struct sockaddr_dl *)sa;
118 if (strlen(name) != sdl->sdl_nlen)
119 continue; /* not same len */
120 if (strncmp(&sdl->sdl_data[0],
122 sdl->sdl_nlen) == 0) {
135 if ((ret_sdl = malloc(sdl->sdl_len)) == NULL)
137 memcpy((caddr_t)ret_sdl, (caddr_t)sdl, sdl->sdl_len);
142 if_getmtu(char *name)
144 struct ifaddrs *ifap, *ifa;
148 if (getifaddrs(&ifap) < 0)
150 for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
151 if (strcmp(ifa->ifa_name, name) == 0) {
160 #ifdef SIOCGIFMTU /* XXX: this ifdef may not be necessary */
165 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0)
168 ifr.ifr_addr.sa_family = AF_INET6;
169 strncpy(ifr.ifr_name, name,
170 sizeof(ifr.ifr_name));
171 if (ioctl(s, SIOCGIFMTU, (caddr_t)&ifr) < 0) {
184 /* give interface index and its old flags, then new flags returned */
186 if_getflags(int ifindex, int oifflags)
191 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
192 syslog(LOG_ERR, "<%s> socket: %s", __func__,
194 return (oifflags & ~IFF_UP);
197 if_indextoname(ifindex, ifr.ifr_name);
198 if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
199 syslog(LOG_ERR, "<%s> ioctl:SIOCGIFFLAGS: failed for %s",
200 __func__, ifr.ifr_name);
202 return (oifflags & ~IFF_UP);
205 return (ifr.ifr_flags);
208 #define ROUNDUP8(a) (1 + (((a) - 1) | 7))
210 lladdropt_length(struct sockaddr_dl *sdl)
212 switch(sdl->sdl_type) {
214 return(ROUNDUP8(ETHER_ADDR_LEN + 2));
221 lladdropt_fill(struct sockaddr_dl *sdl, struct nd_opt_hdr *ndopt)
225 ndopt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; /* fixed */
227 switch(sdl->sdl_type) {
229 ndopt->nd_opt_len = (ROUNDUP8(ETHER_ADDR_LEN + 2)) >> 3;
230 addr = (char *)(ndopt + 1);
231 memcpy(addr, LLADDR(sdl), ETHER_ADDR_LEN);
235 "<%s> unsupported link type(%d)",
236 __func__, sdl->sdl_type);
248 int mib[6] = {CTL_NET, AF_ROUTE, 0, AF_INET6, NET_RT_DUMP, 0};
250 if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
256 #define FILTER_MATCH(type, filter) ((0x1 << type) & filter)
257 #define SIN6(s) ((struct sockaddr_in6 *)(s))
258 #define SDL(s) ((struct sockaddr_dl *)(s))
260 get_next_msg(char *buf, char *lim, int ifindex, size_t *lenp, int filter)
262 struct rt_msghdr *rtm;
263 struct ifa_msghdr *ifam;
264 struct sockaddr *sa, *dst, *gw, *ifa, *rti_info[RTAX_MAX];
267 for (rtm = (struct rt_msghdr *)buf;
268 rtm < (struct rt_msghdr *)lim;
269 rtm = (struct rt_msghdr *)(((char *)rtm) + rtm->rtm_msglen)) {
270 /* just for safety */
271 if (!rtm->rtm_msglen) {
272 syslog(LOG_WARNING, "<%s> rtm_msglen is 0 "
273 "(buf=%p lim=%p rtm=%p)", __func__,
277 if (FILTER_MATCH(rtm->rtm_type, filter) == 0) {
281 switch (rtm->rtm_type) {
285 /* address related checks */
286 sa = (struct sockaddr *)(rtm + 1);
287 get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
288 if ((dst = rti_info[RTAX_DST]) == NULL ||
289 dst->sa_family != AF_INET6)
292 if (IN6_IS_ADDR_LINKLOCAL(&SIN6(dst)->sin6_addr) ||
293 IN6_IS_ADDR_MULTICAST(&SIN6(dst)->sin6_addr))
296 if ((gw = rti_info[RTAX_GATEWAY]) == NULL ||
297 gw->sa_family != AF_LINK)
299 if (ifindex && SDL(gw)->sdl_index != ifindex)
302 if (rti_info[RTAX_NETMASK] == NULL)
306 *lenp = rtm->rtm_msglen;
311 ifam = (struct ifa_msghdr *)rtm;
313 /* address related checks */
314 sa = (struct sockaddr *)(ifam + 1);
315 get_rtaddrs(ifam->ifam_addrs, sa, rti_info);
316 if ((ifa = rti_info[RTAX_IFA]) == NULL ||
317 (ifa->sa_family != AF_INET &&
318 ifa->sa_family != AF_INET6))
321 if (ifa->sa_family == AF_INET6 &&
322 (IN6_IS_ADDR_LINKLOCAL(&SIN6(ifa)->sin6_addr) ||
323 IN6_IS_ADDR_MULTICAST(&SIN6(ifa)->sin6_addr)))
326 if (ifindex && ifam->ifam_index != ifindex)
330 *lenp = ifam->ifam_msglen;
335 *lenp = rtm->rtm_msglen;
348 struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
349 struct sockaddr *sa, *rti_info[RTAX_MAX];
351 sa = (struct sockaddr *)(rtm + 1);
352 get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
354 return(&SIN6(rti_info[RTAX_DST])->sin6_addr);
358 get_rtm_ifindex(char *buf)
360 struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
361 struct sockaddr *sa, *rti_info[RTAX_MAX];
363 sa = (struct sockaddr *)(rtm + 1);
364 get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
366 return(((struct sockaddr_dl *)rti_info[RTAX_GATEWAY])->sdl_index);
370 get_ifm_ifindex(char *buf)
372 struct if_msghdr *ifm = (struct if_msghdr *)buf;
374 return ((int)ifm->ifm_index);
378 get_ifam_ifindex(char *buf)
380 struct ifa_msghdr *ifam = (struct ifa_msghdr *)buf;
382 return ((int)ifam->ifam_index);
386 get_ifm_flags(char *buf)
388 struct if_msghdr *ifm = (struct if_msghdr *)buf;
390 return (ifm->ifm_flags);
394 get_prefixlen(char *buf)
396 struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
397 struct sockaddr *sa, *rti_info[RTAX_MAX];
400 sa = (struct sockaddr *)(rtm + 1);
401 get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
402 sa = rti_info[RTAX_NETMASK];
404 p = (u_char *)(&SIN6(sa)->sin6_addr);
405 lim = (u_char *)sa + sa->sa_len;
406 return prefixlen(p, lim);
410 prefixlen(u_char *p, u_char *lim)
414 for (masklen = 0; p < lim; p++) {
451 rtmsg_type(char *buf)
453 struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
455 return(rtm->rtm_type);
461 struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
463 return(rtm->rtm_msglen);
469 struct if_msghdr *ifm = (struct if_msghdr *)buf;
471 return(ifm->ifm_msglen);
475 * alloc buffer and get if_msghdrs block from kernel,
476 * and put them into the buffer
479 get_iflist(char **buf, size_t *size)
487 mib[4] = NET_RT_IFLIST;
490 if (sysctl(mib, 6, NULL, size, NULL, 0) < 0) {
491 syslog(LOG_ERR, "<%s> sysctl: iflist size get failed",
495 if ((*buf = malloc(*size)) == NULL) {
496 syslog(LOG_ERR, "<%s> malloc failed", __func__);
499 if (sysctl(mib, 6, *buf, size, NULL, 0) < 0) {
500 syslog(LOG_ERR, "<%s> sysctl: iflist get failed",
508 * alloc buffer and parse if_msghdrs block passed as arg,
509 * and init the buffer as list of pointers ot each of the if_msghdr.
512 parse_iflist(struct if_msghdr ***ifmlist_p, char *buf, size_t bufsize)
514 int iflentry_size, malloc_size;
515 struct if_msghdr *ifm;
516 struct ifa_msghdr *ifam;
520 * Estimate least size of an iflist entry, to be obtained from kernel.
521 * Should add sizeof(sockaddr) ??
523 iflentry_size = sizeof(struct if_msghdr);
524 /* roughly estimate max list size of pointers to each if_msghdr */
525 malloc_size = (bufsize/iflentry_size) * sizeof(size_t);
526 if ((*ifmlist_p = (struct if_msghdr **)malloc(malloc_size)) == NULL) {
527 syslog(LOG_ERR, "<%s> malloc failed", __func__);
532 for (ifm = (struct if_msghdr *)buf; ifm < (struct if_msghdr *)lim;) {
533 if (ifm->ifm_msglen == 0) {
534 syslog(LOG_WARNING, "<%s> ifm_msglen is 0 "
535 "(buf=%p lim=%p ifm=%p)", __func__,
540 if (ifm->ifm_type == RTM_IFINFO) {
541 (*ifmlist_p)[ifm->ifm_index] = ifm;
543 syslog(LOG_ERR, "out of sync parsing NET_RT_IFLIST\n"
544 "expected %d, got %d\n msglen = %d\n"
545 "buf:%p, ifm:%p, lim:%p\n",
546 RTM_IFINFO, ifm->ifm_type, ifm->ifm_msglen,
550 for (ifam = (struct ifa_msghdr *)
551 ((char *)ifm + ifm->ifm_msglen);
552 ifam < (struct ifa_msghdr *)lim;
553 ifam = (struct ifa_msghdr *)
554 ((char *)ifam + ifam->ifam_msglen)) {
555 /* just for safety */
556 if (!ifam->ifam_msglen) {
557 syslog(LOG_WARNING, "<%s> ifa_msglen is 0 "
558 "(buf=%p lim=%p ifam=%p)", __func__,
562 if (ifam->ifam_type != RTM_NEWADDR)
565 ifm = (struct if_msghdr *)ifam;
578 /* get iflist block from kernel */
579 get_iflist(&ifblock, &ifblock_size);
581 /* make list of pointers to each if_msghdr */
582 parse_iflist(&iflist, ifblock, ifblock_size);