1/* $FreeBSD: head/usr.sbin/rtadvd/if.c 78064 2001-06-11 12:39:29Z ume $ */
| 1/* $FreeBSD: head/usr.sbin/rtadvd/if.c 118660 2003-08-08 16:38:23Z ume $ */
|
2/* $KAME: if.c,v 1.17 2001/01/21 15:27:30 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#include <sys/param.h>
34#include <sys/socket.h>
35#include <sys/sysctl.h>
36#include <sys/ioctl.h>
37#include <net/if.h>
38#include <net/if_types.h>
39#ifdef __FreeBSD__
40# include <net/ethernet.h>
41#endif
42#include <ifaddrs.h>
43#ifdef __NetBSD__
44#include <net/if_ether.h>
45#endif
46#include <net/route.h>
47#include <net/if_dl.h>
48#include <netinet/in.h>
49#include <netinet/icmp6.h>
50#ifdef __bsdi__
51# include <netinet/if_ether.h>
52#endif
53#ifdef __OpenBSD__
54#include <netinet/if_ether.h>
55#endif
56#include <unistd.h>
57#include <errno.h>
58#include <stdlib.h>
59#include <string.h>
60#include <syslog.h>
61#include "rtadvd.h"
62#include "if.h"
63
64#define ROUNDUP(a, size) \
65 (((a) & ((size)-1)) ? (1 + ((a) | ((size)-1))) : (a))
66
67#define NEXT_SA(ap) (ap) = (struct sockaddr *) \
68 ((caddr_t)(ap) + ((ap)->sa_len ? ROUNDUP((ap)->sa_len,\
69 sizeof(u_long)) :\
70 sizeof(u_long)))
71
72struct if_msghdr **iflist;
73int iflist_init_ok;
74size_t ifblock_size;
75char *ifblock;
76
77static void get_iflist __P((char **buf, size_t *size));
78static void parse_iflist __P((struct if_msghdr ***ifmlist_p, char *buf,
79 size_t bufsize));
80
81static void
82get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
83{
84 int i;
85
86 for (i = 0; i < RTAX_MAX; i++) {
87 if (addrs & (1 << i)) {
88 rti_info[i] = sa;
89 NEXT_SA(sa);
90 }
91 else
92 rti_info[i] = NULL;
93 }
94}
95
96struct sockaddr_dl *
97if_nametosdl(char *name)
98{
99 int mib[6] = {CTL_NET, AF_ROUTE, 0, 0, NET_RT_IFLIST, 0};
100 char *buf, *next, *lim;
101 size_t len;
102 struct if_msghdr *ifm;
103 struct sockaddr *sa, *rti_info[RTAX_MAX];
104 struct sockaddr_dl *sdl = NULL, *ret_sdl;
105
106 if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
107 return(NULL);
108 if ((buf = malloc(len)) == NULL)
109 return(NULL);
110 if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
111 free(buf);
112 return(NULL);
113 }
114
115 lim = buf + len;
116 for (next = buf; next < lim; next += ifm->ifm_msglen) {
117 ifm = (struct if_msghdr *)next;
118 if (ifm->ifm_type == RTM_IFINFO) {
119 sa = (struct sockaddr *)(ifm + 1);
120 get_rtaddrs(ifm->ifm_addrs, sa, rti_info);
121 if ((sa = rti_info[RTAX_IFP]) != NULL) {
122 if (sa->sa_family == AF_LINK) {
123 sdl = (struct sockaddr_dl *)sa;
124 if (strlen(name) != sdl->sdl_nlen)
125 continue; /* not same len */
126 if (strncmp(&sdl->sdl_data[0],
127 name,
128 sdl->sdl_nlen) == 0) {
129 break;
130 }
131 }
132 }
133 }
134 }
135 if (next == lim) {
136 /* search failed */
137 free(buf);
138 return(NULL);
139 }
140
141 if ((ret_sdl = malloc(sdl->sdl_len)) == NULL)
142 return(NULL);
143 memcpy((caddr_t)ret_sdl, (caddr_t)sdl, sdl->sdl_len);
144 return(ret_sdl);
145}
146
147int
148if_getmtu(char *name)
149{
150 struct ifaddrs *ifap, *ifa;
151 struct if_data *ifd;
152 u_long mtu = 0;
153
154 if (getifaddrs(&ifap) < 0)
155 return(0);
156 for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
157 if (strcmp(ifa->ifa_name, name) == 0) {
158 ifd = ifa->ifa_data;
159 if (ifd)
160 mtu = ifd->ifi_mtu;
161 break;
162 }
163 }
164 freeifaddrs(ifap);
165
166#ifdef SIOCGIFMTU /* XXX: this ifdef may not be necessary */
167 if (mtu == 0) {
168 struct ifreq ifr;
169 int s;
170
171 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0)
172 return(0);
173
174 ifr.ifr_addr.sa_family = AF_INET6;
175 strncpy(ifr.ifr_name, name,
176 sizeof(ifr.ifr_name));
177 if (ioctl(s, SIOCGIFMTU, (caddr_t)&ifr) < 0) {
178 close(s);
179 return(0);
180 }
181 close(s);
182
183 mtu = ifr.ifr_mtu;
184 }
185#endif
186
187 return(mtu);
188}
189
190/* give interface index and its old flags, then new flags returned */
191int
192if_getflags(int ifindex, int oifflags)
193{
194 struct ifreq ifr;
195 int s;
196
197 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
| 2/* $KAME: if.c,v 1.17 2001/01/21 15:27:30 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#include <sys/param.h>
34#include <sys/socket.h>
35#include <sys/sysctl.h>
36#include <sys/ioctl.h>
37#include <net/if.h>
38#include <net/if_types.h>
39#ifdef __FreeBSD__
40# include <net/ethernet.h>
41#endif
42#include <ifaddrs.h>
43#ifdef __NetBSD__
44#include <net/if_ether.h>
45#endif
46#include <net/route.h>
47#include <net/if_dl.h>
48#include <netinet/in.h>
49#include <netinet/icmp6.h>
50#ifdef __bsdi__
51# include <netinet/if_ether.h>
52#endif
53#ifdef __OpenBSD__
54#include <netinet/if_ether.h>
55#endif
56#include <unistd.h>
57#include <errno.h>
58#include <stdlib.h>
59#include <string.h>
60#include <syslog.h>
61#include "rtadvd.h"
62#include "if.h"
63
64#define ROUNDUP(a, size) \
65 (((a) & ((size)-1)) ? (1 + ((a) | ((size)-1))) : (a))
66
67#define NEXT_SA(ap) (ap) = (struct sockaddr *) \
68 ((caddr_t)(ap) + ((ap)->sa_len ? ROUNDUP((ap)->sa_len,\
69 sizeof(u_long)) :\
70 sizeof(u_long)))
71
72struct if_msghdr **iflist;
73int iflist_init_ok;
74size_t ifblock_size;
75char *ifblock;
76
77static void get_iflist __P((char **buf, size_t *size));
78static void parse_iflist __P((struct if_msghdr ***ifmlist_p, char *buf,
79 size_t bufsize));
80
81static void
82get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
83{
84 int i;
85
86 for (i = 0; i < RTAX_MAX; i++) {
87 if (addrs & (1 << i)) {
88 rti_info[i] = sa;
89 NEXT_SA(sa);
90 }
91 else
92 rti_info[i] = NULL;
93 }
94}
95
96struct sockaddr_dl *
97if_nametosdl(char *name)
98{
99 int mib[6] = {CTL_NET, AF_ROUTE, 0, 0, NET_RT_IFLIST, 0};
100 char *buf, *next, *lim;
101 size_t len;
102 struct if_msghdr *ifm;
103 struct sockaddr *sa, *rti_info[RTAX_MAX];
104 struct sockaddr_dl *sdl = NULL, *ret_sdl;
105
106 if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
107 return(NULL);
108 if ((buf = malloc(len)) == NULL)
109 return(NULL);
110 if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
111 free(buf);
112 return(NULL);
113 }
114
115 lim = buf + len;
116 for (next = buf; next < lim; next += ifm->ifm_msglen) {
117 ifm = (struct if_msghdr *)next;
118 if (ifm->ifm_type == RTM_IFINFO) {
119 sa = (struct sockaddr *)(ifm + 1);
120 get_rtaddrs(ifm->ifm_addrs, sa, rti_info);
121 if ((sa = rti_info[RTAX_IFP]) != NULL) {
122 if (sa->sa_family == AF_LINK) {
123 sdl = (struct sockaddr_dl *)sa;
124 if (strlen(name) != sdl->sdl_nlen)
125 continue; /* not same len */
126 if (strncmp(&sdl->sdl_data[0],
127 name,
128 sdl->sdl_nlen) == 0) {
129 break;
130 }
131 }
132 }
133 }
134 }
135 if (next == lim) {
136 /* search failed */
137 free(buf);
138 return(NULL);
139 }
140
141 if ((ret_sdl = malloc(sdl->sdl_len)) == NULL)
142 return(NULL);
143 memcpy((caddr_t)ret_sdl, (caddr_t)sdl, sdl->sdl_len);
144 return(ret_sdl);
145}
146
147int
148if_getmtu(char *name)
149{
150 struct ifaddrs *ifap, *ifa;
151 struct if_data *ifd;
152 u_long mtu = 0;
153
154 if (getifaddrs(&ifap) < 0)
155 return(0);
156 for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
157 if (strcmp(ifa->ifa_name, name) == 0) {
158 ifd = ifa->ifa_data;
159 if (ifd)
160 mtu = ifd->ifi_mtu;
161 break;
162 }
163 }
164 freeifaddrs(ifap);
165
166#ifdef SIOCGIFMTU /* XXX: this ifdef may not be necessary */
167 if (mtu == 0) {
168 struct ifreq ifr;
169 int s;
170
171 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0)
172 return(0);
173
174 ifr.ifr_addr.sa_family = AF_INET6;
175 strncpy(ifr.ifr_name, name,
176 sizeof(ifr.ifr_name));
177 if (ioctl(s, SIOCGIFMTU, (caddr_t)&ifr) < 0) {
178 close(s);
179 return(0);
180 }
181 close(s);
182
183 mtu = ifr.ifr_mtu;
184 }
185#endif
186
187 return(mtu);
188}
189
190/* give interface index and its old flags, then new flags returned */
191int
192if_getflags(int ifindex, int oifflags)
193{
194 struct ifreq ifr;
195 int s;
196
197 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
|
198 syslog(LOG_ERR, "<%s> socket: %s", __FUNCTION__,
| 198 syslog(LOG_ERR, "<%s> socket: %s", __func__,
|
199 strerror(errno));
200 return (oifflags & ~IFF_UP);
201 }
202
203 if_indextoname(ifindex, ifr.ifr_name);
204 if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
205 syslog(LOG_ERR, "<%s> ioctl:SIOCGIFFLAGS: failed for %s",
| 199 strerror(errno));
200 return (oifflags & ~IFF_UP);
201 }
202
203 if_indextoname(ifindex, ifr.ifr_name);
204 if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
205 syslog(LOG_ERR, "<%s> ioctl:SIOCGIFFLAGS: failed for %s",
|
206 __FUNCTION__, ifr.ifr_name);
| 206 __func__, ifr.ifr_name);
|
207 close(s);
208 return (oifflags & ~IFF_UP);
209 }
210 close(s);
211 return (ifr.ifr_flags);
212}
213
214#define ROUNDUP8(a) (1 + (((a) - 1) | 7))
215int
216lladdropt_length(struct sockaddr_dl *sdl)
217{
218 switch(sdl->sdl_type) {
219 case IFT_ETHER:
220 return(ROUNDUP8(ETHER_ADDR_LEN + 2));
221 default:
222 return(0);
223 }
224}
225
226void
227lladdropt_fill(struct sockaddr_dl *sdl, struct nd_opt_hdr *ndopt)
228{
229 char *addr;
230
231 ndopt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; /* fixed */
232
233 switch(sdl->sdl_type) {
234 case IFT_ETHER:
235 ndopt->nd_opt_len = (ROUNDUP8(ETHER_ADDR_LEN + 2)) >> 3;
236 addr = (char *)(ndopt + 1);
237 memcpy(addr, LLADDR(sdl), ETHER_ADDR_LEN);
238 break;
239 default:
240 syslog(LOG_ERR,
241 "<%s> unsupported link type(%d)",
| 207 close(s);
208 return (oifflags & ~IFF_UP);
209 }
210 close(s);
211 return (ifr.ifr_flags);
212}
213
214#define ROUNDUP8(a) (1 + (((a) - 1) | 7))
215int
216lladdropt_length(struct sockaddr_dl *sdl)
217{
218 switch(sdl->sdl_type) {
219 case IFT_ETHER:
220 return(ROUNDUP8(ETHER_ADDR_LEN + 2));
221 default:
222 return(0);
223 }
224}
225
226void
227lladdropt_fill(struct sockaddr_dl *sdl, struct nd_opt_hdr *ndopt)
228{
229 char *addr;
230
231 ndopt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; /* fixed */
232
233 switch(sdl->sdl_type) {
234 case IFT_ETHER:
235 ndopt->nd_opt_len = (ROUNDUP8(ETHER_ADDR_LEN + 2)) >> 3;
236 addr = (char *)(ndopt + 1);
237 memcpy(addr, LLADDR(sdl), ETHER_ADDR_LEN);
238 break;
239 default:
240 syslog(LOG_ERR,
241 "<%s> unsupported link type(%d)",
|
242 __FUNCTION__, sdl->sdl_type);
| 242 __func__, sdl->sdl_type);
|
243 exit(1);
244 }
245
246 return;
247}
248
249int
250rtbuf_len()
251{
252 size_t len;
253
254 int mib[6] = {CTL_NET, AF_ROUTE, 0, AF_INET6, NET_RT_DUMP, 0};
255
256 if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
257 return(-1);
258
259 return(len);
260}
261
262#define FILTER_MATCH(type, filter) ((0x1 << type) & filter)
263#define SIN6(s) ((struct sockaddr_in6 *)(s))
264#define SDL(s) ((struct sockaddr_dl *)(s))
265char *
266get_next_msg(char *buf, char *lim, int ifindex, size_t *lenp, int filter)
267{
268 struct rt_msghdr *rtm;
269 struct ifa_msghdr *ifam;
270 struct sockaddr *sa, *dst, *gw, *ifa, *rti_info[RTAX_MAX];
271
272 *lenp = 0;
273 for (rtm = (struct rt_msghdr *)buf;
274 rtm < (struct rt_msghdr *)lim;
275 rtm = (struct rt_msghdr *)(((char *)rtm) + rtm->rtm_msglen)) {
276 /* just for safety */
277 if (!rtm->rtm_msglen) {
278 syslog(LOG_WARNING, "<%s> rtm_msglen is 0 "
| 243 exit(1);
244 }
245
246 return;
247}
248
249int
250rtbuf_len()
251{
252 size_t len;
253
254 int mib[6] = {CTL_NET, AF_ROUTE, 0, AF_INET6, NET_RT_DUMP, 0};
255
256 if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
257 return(-1);
258
259 return(len);
260}
261
262#define FILTER_MATCH(type, filter) ((0x1 << type) & filter)
263#define SIN6(s) ((struct sockaddr_in6 *)(s))
264#define SDL(s) ((struct sockaddr_dl *)(s))
265char *
266get_next_msg(char *buf, char *lim, int ifindex, size_t *lenp, int filter)
267{
268 struct rt_msghdr *rtm;
269 struct ifa_msghdr *ifam;
270 struct sockaddr *sa, *dst, *gw, *ifa, *rti_info[RTAX_MAX];
271
272 *lenp = 0;
273 for (rtm = (struct rt_msghdr *)buf;
274 rtm < (struct rt_msghdr *)lim;
275 rtm = (struct rt_msghdr *)(((char *)rtm) + rtm->rtm_msglen)) {
276 /* just for safety */
277 if (!rtm->rtm_msglen) {
278 syslog(LOG_WARNING, "<%s> rtm_msglen is 0 "
|
279 "(buf=%p lim=%p rtm=%p)", __FUNCTION__,
| 279 "(buf=%p lim=%p rtm=%p)", __func__,
|
280 buf, lim, rtm);
281 break;
282 }
283 if (FILTER_MATCH(rtm->rtm_type, filter) == 0) {
284 continue;
285 }
286
287 switch (rtm->rtm_type) {
288 case RTM_GET:
289 case RTM_ADD:
290 case RTM_DELETE:
291 /* address related checks */
292 sa = (struct sockaddr *)(rtm + 1);
293 get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
294 if ((dst = rti_info[RTAX_DST]) == NULL ||
295 dst->sa_family != AF_INET6)
296 continue;
297
298 if (IN6_IS_ADDR_LINKLOCAL(&SIN6(dst)->sin6_addr) ||
299 IN6_IS_ADDR_MULTICAST(&SIN6(dst)->sin6_addr))
300 continue;
301
302 if ((gw = rti_info[RTAX_GATEWAY]) == NULL ||
303 gw->sa_family != AF_LINK)
304 continue;
305 if (ifindex && SDL(gw)->sdl_index != ifindex)
306 continue;
307
308 if (rti_info[RTAX_NETMASK] == NULL)
309 continue;
310
311 /* found */
312 *lenp = rtm->rtm_msglen;
313 return (char *)rtm;
314 /* NOTREACHED */
315 case RTM_NEWADDR:
316 case RTM_DELADDR:
317 ifam = (struct ifa_msghdr *)rtm;
318
319 /* address related checks */
320 sa = (struct sockaddr *)(ifam + 1);
321 get_rtaddrs(ifam->ifam_addrs, sa, rti_info);
322 if ((ifa = rti_info[RTAX_IFA]) == NULL ||
323 (ifa->sa_family != AF_INET &&
324 ifa->sa_family != AF_INET6))
325 continue;
326
327 if (ifa->sa_family == AF_INET6 &&
328 (IN6_IS_ADDR_LINKLOCAL(&SIN6(ifa)->sin6_addr) ||
329 IN6_IS_ADDR_MULTICAST(&SIN6(ifa)->sin6_addr)))
330 continue;
331
332 if (ifindex && ifam->ifam_index != ifindex)
333 continue;
334
335 /* found */
336 *lenp = ifam->ifam_msglen;
337 return (char *)rtm;
338 /* NOTREACHED */
339 case RTM_IFINFO:
340 /* found */
341 *lenp = rtm->rtm_msglen;
342 return (char *)rtm;
343 /* NOTREACHED */
344 }
345 }
346
347 return (char *)rtm;
348}
349#undef FILTER_MATCH
350
351struct in6_addr *
352get_addr(char *buf)
353{
354 struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
355 struct sockaddr *sa, *rti_info[RTAX_MAX];
356
357 sa = (struct sockaddr *)(rtm + 1);
358 get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
359
360 return(&SIN6(rti_info[RTAX_DST])->sin6_addr);
361}
362
363int
364get_rtm_ifindex(char *buf)
365{
366 struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
367 struct sockaddr *sa, *rti_info[RTAX_MAX];
368
369 sa = (struct sockaddr *)(rtm + 1);
370 get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
371
372 return(((struct sockaddr_dl *)rti_info[RTAX_GATEWAY])->sdl_index);
373}
374
375int
376get_ifm_ifindex(char *buf)
377{
378 struct if_msghdr *ifm = (struct if_msghdr *)buf;
379
380 return ((int)ifm->ifm_index);
381}
382
383int
384get_ifam_ifindex(char *buf)
385{
386 struct ifa_msghdr *ifam = (struct ifa_msghdr *)buf;
387
388 return ((int)ifam->ifam_index);
389}
390
391int
392get_ifm_flags(char *buf)
393{
394 struct if_msghdr *ifm = (struct if_msghdr *)buf;
395
396 return (ifm->ifm_flags);
397}
398
399int
400get_prefixlen(char *buf)
401{
402 struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
403 struct sockaddr *sa, *rti_info[RTAX_MAX];
404 u_char *p, *lim;
405
406 sa = (struct sockaddr *)(rtm + 1);
407 get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
408 sa = rti_info[RTAX_NETMASK];
409
410 p = (u_char *)(&SIN6(sa)->sin6_addr);
411 lim = (u_char *)sa + sa->sa_len;
412 return prefixlen(p, lim);
413}
414
415int
416prefixlen(u_char *p, u_char *lim)
417{
418 int masklen;
419
420 for (masklen = 0; p < lim; p++) {
421 switch (*p) {
422 case 0xff:
423 masklen += 8;
424 break;
425 case 0xfe:
426 masklen += 7;
427 break;
428 case 0xfc:
429 masklen += 6;
430 break;
431 case 0xf8:
432 masklen += 5;
433 break;
434 case 0xf0:
435 masklen += 4;
436 break;
437 case 0xe0:
438 masklen += 3;
439 break;
440 case 0xc0:
441 masklen += 2;
442 break;
443 case 0x80:
444 masklen += 1;
445 break;
446 case 0x00:
447 break;
448 default:
449 return(-1);
450 }
451 }
452
453 return(masklen);
454}
455
456int
457rtmsg_type(char *buf)
458{
459 struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
460
461 return(rtm->rtm_type);
462}
463
464int
465rtmsg_len(char *buf)
466{
467 struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
468
469 return(rtm->rtm_msglen);
470}
471
472int
473ifmsg_len(char *buf)
474{
475 struct if_msghdr *ifm = (struct if_msghdr *)buf;
476
477 return(ifm->ifm_msglen);
478}
479
480/*
481 * alloc buffer and get if_msghdrs block from kernel,
482 * and put them into the buffer
483 */
484static void
485get_iflist(char **buf, size_t *size)
486{
487 int mib[6];
488
489 mib[0] = CTL_NET;
490 mib[1] = PF_ROUTE;
491 mib[2] = 0;
492 mib[3] = AF_INET6;
493 mib[4] = NET_RT_IFLIST;
494 mib[5] = 0;
495
496 if (sysctl(mib, 6, NULL, size, NULL, 0) < 0) {
497 syslog(LOG_ERR, "<%s> sysctl: iflist size get failed",
| 280 buf, lim, rtm);
281 break;
282 }
283 if (FILTER_MATCH(rtm->rtm_type, filter) == 0) {
284 continue;
285 }
286
287 switch (rtm->rtm_type) {
288 case RTM_GET:
289 case RTM_ADD:
290 case RTM_DELETE:
291 /* address related checks */
292 sa = (struct sockaddr *)(rtm + 1);
293 get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
294 if ((dst = rti_info[RTAX_DST]) == NULL ||
295 dst->sa_family != AF_INET6)
296 continue;
297
298 if (IN6_IS_ADDR_LINKLOCAL(&SIN6(dst)->sin6_addr) ||
299 IN6_IS_ADDR_MULTICAST(&SIN6(dst)->sin6_addr))
300 continue;
301
302 if ((gw = rti_info[RTAX_GATEWAY]) == NULL ||
303 gw->sa_family != AF_LINK)
304 continue;
305 if (ifindex && SDL(gw)->sdl_index != ifindex)
306 continue;
307
308 if (rti_info[RTAX_NETMASK] == NULL)
309 continue;
310
311 /* found */
312 *lenp = rtm->rtm_msglen;
313 return (char *)rtm;
314 /* NOTREACHED */
315 case RTM_NEWADDR:
316 case RTM_DELADDR:
317 ifam = (struct ifa_msghdr *)rtm;
318
319 /* address related checks */
320 sa = (struct sockaddr *)(ifam + 1);
321 get_rtaddrs(ifam->ifam_addrs, sa, rti_info);
322 if ((ifa = rti_info[RTAX_IFA]) == NULL ||
323 (ifa->sa_family != AF_INET &&
324 ifa->sa_family != AF_INET6))
325 continue;
326
327 if (ifa->sa_family == AF_INET6 &&
328 (IN6_IS_ADDR_LINKLOCAL(&SIN6(ifa)->sin6_addr) ||
329 IN6_IS_ADDR_MULTICAST(&SIN6(ifa)->sin6_addr)))
330 continue;
331
332 if (ifindex && ifam->ifam_index != ifindex)
333 continue;
334
335 /* found */
336 *lenp = ifam->ifam_msglen;
337 return (char *)rtm;
338 /* NOTREACHED */
339 case RTM_IFINFO:
340 /* found */
341 *lenp = rtm->rtm_msglen;
342 return (char *)rtm;
343 /* NOTREACHED */
344 }
345 }
346
347 return (char *)rtm;
348}
349#undef FILTER_MATCH
350
351struct in6_addr *
352get_addr(char *buf)
353{
354 struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
355 struct sockaddr *sa, *rti_info[RTAX_MAX];
356
357 sa = (struct sockaddr *)(rtm + 1);
358 get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
359
360 return(&SIN6(rti_info[RTAX_DST])->sin6_addr);
361}
362
363int
364get_rtm_ifindex(char *buf)
365{
366 struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
367 struct sockaddr *sa, *rti_info[RTAX_MAX];
368
369 sa = (struct sockaddr *)(rtm + 1);
370 get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
371
372 return(((struct sockaddr_dl *)rti_info[RTAX_GATEWAY])->sdl_index);
373}
374
375int
376get_ifm_ifindex(char *buf)
377{
378 struct if_msghdr *ifm = (struct if_msghdr *)buf;
379
380 return ((int)ifm->ifm_index);
381}
382
383int
384get_ifam_ifindex(char *buf)
385{
386 struct ifa_msghdr *ifam = (struct ifa_msghdr *)buf;
387
388 return ((int)ifam->ifam_index);
389}
390
391int
392get_ifm_flags(char *buf)
393{
394 struct if_msghdr *ifm = (struct if_msghdr *)buf;
395
396 return (ifm->ifm_flags);
397}
398
399int
400get_prefixlen(char *buf)
401{
402 struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
403 struct sockaddr *sa, *rti_info[RTAX_MAX];
404 u_char *p, *lim;
405
406 sa = (struct sockaddr *)(rtm + 1);
407 get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
408 sa = rti_info[RTAX_NETMASK];
409
410 p = (u_char *)(&SIN6(sa)->sin6_addr);
411 lim = (u_char *)sa + sa->sa_len;
412 return prefixlen(p, lim);
413}
414
415int
416prefixlen(u_char *p, u_char *lim)
417{
418 int masklen;
419
420 for (masklen = 0; p < lim; p++) {
421 switch (*p) {
422 case 0xff:
423 masklen += 8;
424 break;
425 case 0xfe:
426 masklen += 7;
427 break;
428 case 0xfc:
429 masklen += 6;
430 break;
431 case 0xf8:
432 masklen += 5;
433 break;
434 case 0xf0:
435 masklen += 4;
436 break;
437 case 0xe0:
438 masklen += 3;
439 break;
440 case 0xc0:
441 masklen += 2;
442 break;
443 case 0x80:
444 masklen += 1;
445 break;
446 case 0x00:
447 break;
448 default:
449 return(-1);
450 }
451 }
452
453 return(masklen);
454}
455
456int
457rtmsg_type(char *buf)
458{
459 struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
460
461 return(rtm->rtm_type);
462}
463
464int
465rtmsg_len(char *buf)
466{
467 struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
468
469 return(rtm->rtm_msglen);
470}
471
472int
473ifmsg_len(char *buf)
474{
475 struct if_msghdr *ifm = (struct if_msghdr *)buf;
476
477 return(ifm->ifm_msglen);
478}
479
480/*
481 * alloc buffer and get if_msghdrs block from kernel,
482 * and put them into the buffer
483 */
484static void
485get_iflist(char **buf, size_t *size)
486{
487 int mib[6];
488
489 mib[0] = CTL_NET;
490 mib[1] = PF_ROUTE;
491 mib[2] = 0;
492 mib[3] = AF_INET6;
493 mib[4] = NET_RT_IFLIST;
494 mib[5] = 0;
495
496 if (sysctl(mib, 6, NULL, size, NULL, 0) < 0) {
497 syslog(LOG_ERR, "<%s> sysctl: iflist size get failed",
|
498 __FUNCTION__);
| 498 __func__);
|
499 exit(1);
500 }
501 if ((*buf = malloc(*size)) == NULL) {
| 499 exit(1);
500 }
501 if ((*buf = malloc(*size)) == NULL) {
|
502 syslog(LOG_ERR, "<%s> malloc failed", __FUNCTION__);
| 502 syslog(LOG_ERR, "<%s> malloc failed", __func__);
|
503 exit(1);
504 }
505 if (sysctl(mib, 6, *buf, size, NULL, 0) < 0) {
506 syslog(LOG_ERR, "<%s> sysctl: iflist get failed",
| 503 exit(1);
504 }
505 if (sysctl(mib, 6, *buf, size, NULL, 0) < 0) {
506 syslog(LOG_ERR, "<%s> sysctl: iflist get failed",
|
507 __FUNCTION__);
| 507 __func__);
|
508 exit(1);
509 }
510 return;
511}
512
513/*
514 * alloc buffer and parse if_msghdrs block passed as arg,
515 * and init the buffer as list of pointers ot each of the if_msghdr.
516 */
517static void
518parse_iflist(struct if_msghdr ***ifmlist_p, char *buf, size_t bufsize)
519{
520 int iflentry_size, malloc_size;
521 struct if_msghdr *ifm;
522 struct ifa_msghdr *ifam;
523 char *lim;
524
525 /*
526 * Estimate least size of an iflist entry, to be obtained from kernel.
527 * Should add sizeof(sockaddr) ??
528 */
529 iflentry_size = sizeof(struct if_msghdr);
530 /* roughly estimate max list size of pointers to each if_msghdr */
531 malloc_size = (bufsize/iflentry_size) * sizeof(size_t);
532 if ((*ifmlist_p = (struct if_msghdr **)malloc(malloc_size)) == NULL) {
| 508 exit(1);
509 }
510 return;
511}
512
513/*
514 * alloc buffer and parse if_msghdrs block passed as arg,
515 * and init the buffer as list of pointers ot each of the if_msghdr.
516 */
517static void
518parse_iflist(struct if_msghdr ***ifmlist_p, char *buf, size_t bufsize)
519{
520 int iflentry_size, malloc_size;
521 struct if_msghdr *ifm;
522 struct ifa_msghdr *ifam;
523 char *lim;
524
525 /*
526 * Estimate least size of an iflist entry, to be obtained from kernel.
527 * Should add sizeof(sockaddr) ??
528 */
529 iflentry_size = sizeof(struct if_msghdr);
530 /* roughly estimate max list size of pointers to each if_msghdr */
531 malloc_size = (bufsize/iflentry_size) * sizeof(size_t);
532 if ((*ifmlist_p = (struct if_msghdr **)malloc(malloc_size)) == NULL) {
|
533 syslog(LOG_ERR, "<%s> malloc failed", __FUNCTION__);
| 533 syslog(LOG_ERR, "<%s> malloc failed", __func__);
|
534 exit(1);
535 }
536
537 lim = buf + bufsize;
538 for (ifm = (struct if_msghdr *)buf; ifm < (struct if_msghdr *)lim;) {
539 if (ifm->ifm_msglen == 0) {
540 syslog(LOG_WARNING, "<%s> ifm_msglen is 0 "
| 534 exit(1);
535 }
536
537 lim = buf + bufsize;
538 for (ifm = (struct if_msghdr *)buf; ifm < (struct if_msghdr *)lim;) {
539 if (ifm->ifm_msglen == 0) {
540 syslog(LOG_WARNING, "<%s> ifm_msglen is 0 "
|
541 "(buf=%p lim=%p ifm=%p)", __FUNCTION__,
| 541 "(buf=%p lim=%p ifm=%p)", __func__,
|
542 buf, lim, ifm);
543 return;
544 }
545
546 if (ifm->ifm_type == RTM_IFINFO) {
547 (*ifmlist_p)[ifm->ifm_index] = ifm;
548 } else {
549 syslog(LOG_ERR, "out of sync parsing NET_RT_IFLIST\n"
550 "expected %d, got %d\n msglen = %d\n"
551 "buf:%p, ifm:%p, lim:%p\n",
552 RTM_IFINFO, ifm->ifm_type, ifm->ifm_msglen,
553 buf, ifm, lim);
554 exit (1);
555 }
556 for (ifam = (struct ifa_msghdr *)
557 ((char *)ifm + ifm->ifm_msglen);
558 ifam < (struct ifa_msghdr *)lim;
559 ifam = (struct ifa_msghdr *)
560 ((char *)ifam + ifam->ifam_msglen)) {
561 /* just for safety */
562 if (!ifam->ifam_msglen) {
563 syslog(LOG_WARNING, "<%s> ifa_msglen is 0 "
| 542 buf, lim, ifm);
543 return;
544 }
545
546 if (ifm->ifm_type == RTM_IFINFO) {
547 (*ifmlist_p)[ifm->ifm_index] = ifm;
548 } else {
549 syslog(LOG_ERR, "out of sync parsing NET_RT_IFLIST\n"
550 "expected %d, got %d\n msglen = %d\n"
551 "buf:%p, ifm:%p, lim:%p\n",
552 RTM_IFINFO, ifm->ifm_type, ifm->ifm_msglen,
553 buf, ifm, lim);
554 exit (1);
555 }
556 for (ifam = (struct ifa_msghdr *)
557 ((char *)ifm + ifm->ifm_msglen);
558 ifam < (struct ifa_msghdr *)lim;
559 ifam = (struct ifa_msghdr *)
560 ((char *)ifam + ifam->ifam_msglen)) {
561 /* just for safety */
562 if (!ifam->ifam_msglen) {
563 syslog(LOG_WARNING, "<%s> ifa_msglen is 0 "
|
564 "(buf=%p lim=%p ifam=%p)", __FUNCTION__,
| 564 "(buf=%p lim=%p ifam=%p)", __func__,
|
565 buf, lim, ifam);
566 return;
567 }
568 if (ifam->ifam_type != RTM_NEWADDR)
569 break;
570 }
571 ifm = (struct if_msghdr *)ifam;
572 }
573}
574
575void
576init_iflist()
577{
578 if (ifblock) {
579 free(ifblock);
580 ifblock_size = 0;
581 }
582 if (iflist)
583 free(iflist);
584 /* get iflist block from kernel */
585 get_iflist(&ifblock, &ifblock_size);
586
587 /* make list of pointers to each if_msghdr */
588 parse_iflist(&iflist, ifblock, ifblock_size);
589}
| 565 buf, lim, ifam);
566 return;
567 }
568 if (ifam->ifam_type != RTM_NEWADDR)
569 break;
570 }
571 ifm = (struct if_msghdr *)ifam;
572 }
573}
574
575void
576init_iflist()
577{
578 if (ifblock) {
579 free(ifblock);
580 ifblock_size = 0;
581 }
582 if (iflist)
583 free(iflist);
584 /* get iflist block from kernel */
585 get_iflist(&ifblock, &ifblock_size);
586
587 /* make list of pointers to each if_msghdr */
588 parse_iflist(&iflist, ifblock, ifblock_size);
589}
|