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718e3744 | 1 | /* Kernel communication using routing socket. |
2 | * Copyright (C) 1999 Kunihiro Ishiguro | |
3 | * | |
4 | * This file is part of GNU Zebra. | |
5 | * | |
6 | * GNU Zebra is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the | |
8 | * Free Software Foundation; either version 2, or (at your option) any | |
9 | * later version. | |
10 | * | |
11 | * GNU Zebra is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with GNU Zebra; see the file COPYING. If not, write to the Free | |
18 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
19 | * 02111-1307, USA. | |
20 | */ | |
21 | ||
22 | #include <zebra.h> | |
23 | ||
24 | #include "if.h" | |
25 | #include "prefix.h" | |
26 | #include "sockunion.h" | |
27 | #include "connected.h" | |
28 | #include "memory.h" | |
29 | #include "ioctl.h" | |
30 | #include "log.h" | |
31 | #include "str.h" | |
32 | #include "table.h" | |
33 | #include "rib.h" | |
34 | ||
35 | #include "zebra/interface.h" | |
36 | #include "zebra/zserv.h" | |
37 | #include "zebra/debug.h" | |
38 | ||
39 | /* Socket length roundup function. */ | |
40 | #define ROUNDUP(a) \ | |
41 | ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) | |
42 | ||
43 | /* And this macro is wrapper for handling sa_len. */ | |
44 | #ifdef HAVE_SA_LEN | |
45 | #define WRAPUP(X) ROUNDUP(((struct sockaddr *)(X))->sa_len) | |
46 | #else | |
47 | #define WRAPUP(X) ROUNDUP(sizeof (struct sockaddr)) | |
48 | #endif /* HAVE_SA_LEN */ | |
49 | ||
50 | /* Routing socket message types. */ | |
51 | struct message rtm_type_str[] = | |
52 | { | |
53 | {RTM_ADD, "RTM_ADD"}, | |
54 | {RTM_DELETE, "RTM_DELETE"}, | |
55 | {RTM_CHANGE, "RTM_CHANGE"}, | |
56 | {RTM_GET, "RTM_GET"}, | |
57 | {RTM_LOSING, "RTM_LOSING"}, | |
58 | {RTM_REDIRECT, "RTM_REDIRECT"}, | |
59 | {RTM_MISS, "RTM_MISS"}, | |
60 | {RTM_LOCK, "RTM_LOCK"}, | |
61 | {RTM_OLDADD, "RTM_OLDADD"}, | |
62 | {RTM_OLDDEL, "RTM_OLDDEL"}, | |
63 | {RTM_RESOLVE, "RTM_RESOLVE"}, | |
64 | {RTM_NEWADDR, "RTM_NEWADDR"}, | |
65 | {RTM_DELADDR, "RTM_DELADDR"}, | |
66 | {RTM_IFINFO, "RTM_IFINFO"}, | |
67 | #ifdef RTM_OIFINFO | |
68 | {RTM_OIFINFO, "RTM_OIFINFO"}, | |
69 | #endif /* RTM_OIFINFO */ | |
70 | #ifdef RTM_NEWMADDR | |
71 | {RTM_NEWMADDR, "RTM_NEWMADDR"}, | |
72 | #endif /* RTM_NEWMADDR */ | |
73 | #ifdef RTM_DELMADDR | |
74 | {RTM_DELMADDR, "RTM_DELMADDR"}, | |
75 | #endif /* RTM_DELMADDR */ | |
76 | #ifdef RTM_IFANNOUNCE | |
77 | {RTM_IFANNOUNCE, "RTM_IFANNOUNCE"}, | |
78 | #endif /* RTM_IFANNOUNCE */ | |
79 | {0, NULL} | |
80 | }; | |
81 | ||
82 | struct message rtm_flag_str[] = | |
83 | { | |
84 | {RTF_UP, "UP"}, | |
85 | {RTF_GATEWAY, "GATEWAY"}, | |
86 | {RTF_HOST, "HOST"}, | |
87 | {RTF_REJECT, "REJECT"}, | |
88 | {RTF_DYNAMIC, "DYNAMIC"}, | |
89 | {RTF_MODIFIED, "MODIFIED"}, | |
90 | {RTF_DONE, "DONE"}, | |
91 | #ifdef RTF_MASK | |
92 | {RTF_MASK, "MASK"}, | |
93 | #endif /* RTF_MASK */ | |
94 | {RTF_CLONING, "CLONING"}, | |
95 | {RTF_XRESOLVE, "XRESOLVE"}, | |
96 | {RTF_LLINFO, "LLINFO"}, | |
97 | {RTF_STATIC, "STATIC"}, | |
98 | {RTF_BLACKHOLE, "BLACKHOLE"}, | |
99 | {RTF_PROTO1, "PROTO1"}, | |
100 | {RTF_PROTO2, "PROTO2"}, | |
101 | #ifdef RTF_PRCLONING | |
102 | {RTF_PRCLONING, "PRCLONING"}, | |
103 | #endif /* RTF_PRCLONING */ | |
104 | #ifdef RTF_WASCLONED | |
105 | {RTF_WASCLONED, "WASCLONED"}, | |
106 | #endif /* RTF_WASCLONED */ | |
107 | #ifdef RTF_PROTO3 | |
108 | {RTF_PROTO3, "PROTO3"}, | |
109 | #endif /* RTF_PROTO3 */ | |
110 | #ifdef RTF_PINNED | |
111 | {RTF_PINNED, "PINNED"}, | |
112 | #endif /* RTF_PINNED */ | |
113 | #ifdef RTF_LOCAL | |
114 | {RTF_LOCAL, "LOCAL"}, | |
115 | #endif /* RTF_LOCAL */ | |
116 | #ifdef RTF_BROADCAST | |
117 | {RTF_BROADCAST, "BROADCAST"}, | |
118 | #endif /* RTF_BROADCAST */ | |
119 | #ifdef RTF_MULTICAST | |
120 | {RTF_MULTICAST, "MULTICAST"}, | |
121 | #endif /* RTF_MULTICAST */ | |
122 | {0, NULL} | |
123 | }; | |
124 | ||
125 | /* Kernel routing update socket. */ | |
126 | int routing_sock = -1; | |
127 | ||
128 | /* Yes I'm checking ugly routing socket behavior. */ | |
129 | /* #define DEBUG */ | |
130 | ||
131 | /* Supported address family check. */ | |
132 | static int | |
133 | af_check (int family) | |
134 | { | |
135 | if (family == AF_INET) | |
136 | return 1; | |
137 | #ifdef HAVE_IPV6 | |
138 | if (family == AF_INET6) | |
139 | return 1; | |
140 | #endif /* HAVE_IPV6 */ | |
141 | return 0; | |
142 | } | |
143 | \f | |
144 | /* Dump routing table flag for debug purpose. */ | |
145 | void | |
146 | rtm_flag_dump (int flag) | |
147 | { | |
148 | struct message *mes; | |
149 | static char buf[BUFSIZ]; | |
150 | ||
151 | for (mes = rtm_flag_str; mes->key != 0; mes++) | |
152 | { | |
153 | if (mes->key & flag) | |
154 | { | |
155 | strlcat (buf, mes->str, BUFSIZ); | |
156 | strlcat (buf, " ", BUFSIZ); | |
157 | } | |
158 | } | |
159 | zlog_info ("Kernel: %s", buf); | |
160 | } | |
161 | ||
162 | #ifdef RTM_IFANNOUNCE | |
163 | /* Interface adding function */ | |
164 | int | |
165 | ifan_read (struct if_announcemsghdr *ifan) | |
166 | { | |
167 | struct interface *ifp; | |
168 | ||
169 | ifp = if_lookup_by_index (ifan->ifan_index); | |
170 | if (ifp == NULL && ifan->ifan_what == IFAN_ARRIVAL) | |
171 | { | |
172 | /* Create Interface */ | |
173 | ifp = if_get_by_name (ifan->ifan_name); | |
174 | ifp->ifindex = ifan->ifan_index; | |
175 | ||
176 | if_add_update (ifp); | |
177 | } | |
178 | else if (ifp != NULL && ifan->ifan_what == IFAN_DEPARTURE) | |
179 | { | |
180 | if_delete_update (ifp); | |
181 | if_delete (ifp); | |
182 | } | |
183 | ||
184 | if_get_flags (ifp); | |
185 | if_get_mtu (ifp); | |
186 | if_get_metric (ifp); | |
187 | ||
188 | if (IS_ZEBRA_DEBUG_KERNEL) | |
189 | zlog_info ("interface %s index %d", ifp->name, ifp->ifindex); | |
190 | ||
191 | return 0; | |
192 | } | |
193 | #endif /* RTM_IFANNOUNCE */ | |
194 | ||
195 | /* Interface adding function called from interface_list. */ | |
196 | int | |
197 | ifm_read (struct if_msghdr *ifm) | |
198 | { | |
199 | struct interface *ifp; | |
200 | struct sockaddr_dl *sdl = NULL; | |
201 | ||
202 | sdl = (struct sockaddr_dl *)(ifm + 1); | |
203 | ||
204 | /* Use sdl index. */ | |
205 | ifp = if_lookup_by_index (ifm->ifm_index); | |
206 | ||
207 | if (ifp == NULL) | |
208 | { | |
209 | /* Check interface's address.*/ | |
210 | if (! (ifm->ifm_addrs & RTA_IFP)) | |
211 | { | |
212 | zlog_warn ("There must be RTA_IFP address for ifindex %d\n", | |
213 | ifm->ifm_index); | |
214 | return -1; | |
215 | } | |
216 | ||
217 | ifp = if_create (); | |
218 | ||
219 | strncpy (ifp->name, sdl->sdl_data, sdl->sdl_nlen); | |
220 | ifp->ifindex = ifm->ifm_index; | |
221 | ifp->flags = ifm->ifm_flags; | |
222 | #if defined(__bsdi__) | |
223 | if_kvm_get_mtu (ifp); | |
224 | #else | |
225 | if_get_mtu (ifp); | |
226 | #endif /* __bsdi__ */ | |
227 | if_get_metric (ifp); | |
228 | ||
229 | /* Fetch hardware address. */ | |
230 | if (sdl->sdl_family != AF_LINK) | |
231 | { | |
232 | zlog_warn ("sockaddr_dl->sdl_family is not AF_LINK"); | |
233 | return -1; | |
234 | } | |
235 | memcpy (&ifp->sdl, sdl, sizeof (struct sockaddr_dl)); | |
236 | ||
237 | if_add_update (ifp); | |
238 | } | |
239 | else | |
240 | { | |
241 | /* There is a case of promisc, allmulti flag modification. */ | |
242 | if (if_is_up (ifp)) | |
243 | { | |
244 | ifp->flags = ifm->ifm_flags; | |
245 | if (! if_is_up (ifp)) | |
246 | if_down (ifp); | |
247 | } | |
248 | else | |
249 | { | |
250 | ifp->flags = ifm->ifm_flags; | |
251 | if (if_is_up (ifp)) | |
252 | if_up (ifp); | |
253 | } | |
254 | } | |
255 | ||
256 | #ifdef HAVE_NET_RT_IFLIST | |
257 | ifp->stats = ifm->ifm_data; | |
258 | #endif /* HAVE_NET_RT_IFLIST */ | |
259 | ||
260 | if (IS_ZEBRA_DEBUG_KERNEL) | |
261 | zlog_info ("interface %s index %d", ifp->name, ifp->ifindex); | |
262 | ||
263 | return 0; | |
264 | } | |
265 | \f | |
266 | /* Address read from struct ifa_msghdr. */ | |
267 | void | |
268 | ifam_read_mesg (struct ifa_msghdr *ifm, | |
269 | union sockunion *addr, | |
270 | union sockunion *mask, | |
271 | union sockunion *dest) | |
272 | { | |
273 | caddr_t pnt, end; | |
274 | ||
275 | pnt = (caddr_t)(ifm + 1); | |
276 | end = ((caddr_t)ifm) + ifm->ifam_msglen; | |
277 | ||
278 | #define IFAMADDRGET(X,R) \ | |
279 | if (ifm->ifam_addrs & (R)) \ | |
280 | { \ | |
281 | int len = WRAPUP(pnt); \ | |
282 | if (((X) != NULL) && af_check (((struct sockaddr *)pnt)->sa_family)) \ | |
283 | memcpy ((caddr_t)(X), pnt, len); \ | |
284 | pnt += len; \ | |
285 | } | |
286 | #define IFAMMASKGET(X,R) \ | |
287 | if (ifm->ifam_addrs & (R)) \ | |
288 | { \ | |
289 | int len = WRAPUP(pnt); \ | |
290 | if ((X) != NULL) \ | |
291 | memcpy ((caddr_t)(X), pnt, len); \ | |
292 | pnt += len; \ | |
293 | } | |
294 | ||
295 | /* Be sure structure is cleared */ | |
296 | memset (mask, 0, sizeof (union sockunion)); | |
297 | memset (addr, 0, sizeof (union sockunion)); | |
298 | memset (dest, 0, sizeof (union sockunion)); | |
299 | ||
300 | /* We fetch each socket variable into sockunion. */ | |
301 | IFAMADDRGET (NULL, RTA_DST); | |
302 | IFAMADDRGET (NULL, RTA_GATEWAY); | |
303 | IFAMMASKGET (mask, RTA_NETMASK); | |
304 | IFAMADDRGET (NULL, RTA_GENMASK); | |
305 | IFAMADDRGET (NULL, RTA_IFP); | |
306 | IFAMADDRGET (addr, RTA_IFA); | |
307 | IFAMADDRGET (NULL, RTA_AUTHOR); | |
308 | IFAMADDRGET (dest, RTA_BRD); | |
309 | ||
310 | /* Assert read up end point matches to end point */ | |
311 | if (pnt != end) | |
312 | zlog_warn ("ifam_read() does't read all socket data"); | |
313 | } | |
314 | ||
315 | /* Interface's address information get. */ | |
316 | int | |
317 | ifam_read (struct ifa_msghdr *ifam) | |
318 | { | |
319 | struct interface *ifp; | |
320 | union sockunion addr, mask, gate; | |
321 | ||
322 | /* Check does this interface exist or not. */ | |
323 | ifp = if_lookup_by_index (ifam->ifam_index); | |
324 | if (ifp == NULL) | |
325 | { | |
326 | zlog_warn ("no interface for index %d", ifam->ifam_index); | |
327 | return -1; | |
328 | } | |
329 | ||
330 | /* Allocate and read address information. */ | |
331 | ifam_read_mesg (ifam, &addr, &mask, &gate); | |
332 | ||
333 | /* Check interface flag for implicit up of the interface. */ | |
334 | if_refresh (ifp); | |
335 | ||
336 | /* Add connected address. */ | |
337 | switch (sockunion_family (&addr)) | |
338 | { | |
339 | case AF_INET: | |
340 | if (ifam->ifam_type == RTM_NEWADDR) | |
341 | connected_add_ipv4 (ifp, 0, &addr.sin.sin_addr, | |
342 | ip_masklen (mask.sin.sin_addr), | |
343 | &gate.sin.sin_addr, NULL); | |
344 | else | |
345 | connected_delete_ipv4 (ifp, 0, &addr.sin.sin_addr, | |
346 | ip_masklen (mask.sin.sin_addr), | |
347 | &gate.sin.sin_addr, NULL); | |
348 | break; | |
349 | #ifdef HAVE_IPV6 | |
350 | case AF_INET6: | |
351 | /* Unset interface index from link-local address when IPv6 stack | |
352 | is KAME. */ | |
353 | if (IN6_IS_ADDR_LINKLOCAL (&addr.sin6.sin6_addr)) | |
354 | SET_IN6_LINKLOCAL_IFINDEX (addr.sin6.sin6_addr, 0); | |
355 | ||
356 | if (ifam->ifam_type == RTM_NEWADDR) | |
357 | connected_add_ipv6 (ifp, | |
358 | &addr.sin6.sin6_addr, | |
359 | ip6_masklen (mask.sin6.sin6_addr), | |
360 | &gate.sin6.sin6_addr); | |
361 | else | |
362 | connected_delete_ipv6 (ifp, | |
363 | &addr.sin6.sin6_addr, | |
364 | ip6_masklen (mask.sin6.sin6_addr), | |
365 | &gate.sin6.sin6_addr); | |
366 | break; | |
367 | #endif /* HAVE_IPV6 */ | |
368 | default: | |
369 | /* Unsupported family silently ignore... */ | |
370 | break; | |
371 | } | |
372 | return 0; | |
373 | } | |
374 | \f | |
375 | /* Interface function for reading kernel routing table information. */ | |
376 | int | |
377 | rtm_read_mesg (struct rt_msghdr *rtm, | |
378 | union sockunion *dest, | |
379 | union sockunion *mask, | |
380 | union sockunion *gate) | |
381 | { | |
382 | caddr_t pnt, end; | |
383 | ||
384 | /* Pnt points out socket data start point. */ | |
385 | pnt = (caddr_t)(rtm + 1); | |
386 | end = ((caddr_t)rtm) + rtm->rtm_msglen; | |
387 | ||
388 | /* rt_msghdr version check. */ | |
389 | if (rtm->rtm_version != RTM_VERSION) | |
390 | zlog (NULL, LOG_WARNING, | |
391 | "Routing message version different %d should be %d." | |
392 | "This may cause problem\n", rtm->rtm_version, RTM_VERSION); | |
393 | ||
394 | #define RTMADDRGET(X,R) \ | |
395 | if (rtm->rtm_addrs & (R)) \ | |
396 | { \ | |
397 | int len = WRAPUP (pnt); \ | |
398 | if (((X) != NULL) && af_check (((struct sockaddr *)pnt)->sa_family)) \ | |
399 | memcpy ((caddr_t)(X), pnt, len); \ | |
400 | pnt += len; \ | |
401 | } | |
402 | #define RTMMASKGET(X,R) \ | |
403 | if (rtm->rtm_addrs & (R)) \ | |
404 | { \ | |
405 | int len = WRAPUP (pnt); \ | |
406 | if ((X) != NULL) \ | |
407 | memcpy ((caddr_t)(X), pnt, len); \ | |
408 | pnt += len; \ | |
409 | } | |
410 | ||
411 | /* Be sure structure is cleared */ | |
412 | memset (dest, 0, sizeof (union sockunion)); | |
413 | memset (gate, 0, sizeof (union sockunion)); | |
414 | memset (mask, 0, sizeof (union sockunion)); | |
415 | ||
416 | /* We fetch each socket variable into sockunion. */ | |
417 | RTMADDRGET (dest, RTA_DST); | |
418 | RTMADDRGET (gate, RTA_GATEWAY); | |
419 | RTMMASKGET (mask, RTA_NETMASK); | |
420 | RTMADDRGET (NULL, RTA_GENMASK); | |
421 | RTMADDRGET (NULL, RTA_IFP); | |
422 | RTMADDRGET (NULL, RTA_IFA); | |
423 | RTMADDRGET (NULL, RTA_AUTHOR); | |
424 | RTMADDRGET (NULL, RTA_BRD); | |
425 | ||
426 | /* If there is netmask information set it's family same as | |
427 | destination family*/ | |
428 | if (rtm->rtm_addrs & RTA_NETMASK) | |
429 | mask->sa.sa_family = dest->sa.sa_family; | |
430 | ||
431 | /* Assert read up to the end of pointer. */ | |
432 | if (pnt != end) | |
433 | zlog (NULL, LOG_WARNING, "rtm_read() does't read all socket data."); | |
434 | ||
435 | return rtm->rtm_flags; | |
436 | } | |
437 | ||
438 | void | |
439 | rtm_read (struct rt_msghdr *rtm) | |
440 | { | |
441 | int flags; | |
442 | u_char zebra_flags; | |
443 | union sockunion dest, mask, gate; | |
444 | ||
445 | zebra_flags = 0; | |
446 | ||
447 | /* Discard self send message. */ | |
448 | if (rtm->rtm_type != RTM_GET | |
449 | && (rtm->rtm_pid == pid || rtm->rtm_pid == old_pid)) | |
450 | return; | |
451 | ||
452 | /* Read destination and netmask and gateway from rtm message | |
453 | structure. */ | |
454 | flags = rtm_read_mesg (rtm, &dest, &mask, &gate); | |
455 | ||
456 | #ifdef RTF_CLONED /*bsdi, netbsd 1.6*/ | |
457 | if (flags & RTF_CLONED) | |
458 | return; | |
459 | #endif | |
460 | #ifdef RTF_WASCLONED /*freebsd*/ | |
461 | if (flags & RTF_WASCLONED) | |
462 | return; | |
463 | #endif | |
464 | ||
465 | if ((rtm->rtm_type == RTM_ADD) && ! (flags & RTF_UP)) | |
466 | return; | |
467 | ||
468 | /* This is connected route. */ | |
469 | if (! (flags & RTF_GATEWAY)) | |
470 | return; | |
471 | ||
472 | if (flags & RTF_PROTO1) | |
473 | SET_FLAG (zebra_flags, ZEBRA_FLAG_SELFROUTE); | |
474 | ||
475 | /* This is persistent route. */ | |
476 | if (flags & RTF_STATIC) | |
477 | SET_FLAG (zebra_flags, ZEBRA_FLAG_STATIC); | |
478 | ||
479 | if (dest.sa.sa_family == AF_INET) | |
480 | { | |
481 | struct prefix_ipv4 p; | |
482 | ||
483 | p.family = AF_INET; | |
484 | p.prefix = dest.sin.sin_addr; | |
485 | if (flags & RTF_HOST) | |
486 | p.prefixlen = IPV4_MAX_PREFIXLEN; | |
487 | else | |
488 | p.prefixlen = ip_masklen (mask.sin.sin_addr); | |
489 | ||
490 | if (rtm->rtm_type == RTM_GET || rtm->rtm_type == RTM_ADD) | |
491 | rib_add_ipv4 (ZEBRA_ROUTE_KERNEL, zebra_flags, | |
492 | &p, &gate.sin.sin_addr, 0, 0, 0, 0); | |
493 | else | |
494 | rib_delete_ipv4 (ZEBRA_ROUTE_KERNEL, zebra_flags, | |
495 | &p, &gate.sin.sin_addr, 0, 0); | |
496 | } | |
497 | #ifdef HAVE_IPV6 | |
498 | if (dest.sa.sa_family == AF_INET6) | |
499 | { | |
500 | struct prefix_ipv6 p; | |
501 | unsigned int ifindex = 0; | |
502 | ||
503 | p.family = AF_INET6; | |
504 | p.prefix = dest.sin6.sin6_addr; | |
505 | if (flags & RTF_HOST) | |
506 | p.prefixlen = IPV6_MAX_PREFIXLEN; | |
507 | else | |
508 | p.prefixlen = ip6_masklen (mask.sin6.sin6_addr); | |
509 | ||
510 | #ifdef KAME | |
511 | if (IN6_IS_ADDR_LINKLOCAL (&gate.sin6.sin6_addr)) | |
512 | { | |
513 | ifindex = IN6_LINKLOCAL_IFINDEX (gate.sin6.sin6_addr); | |
514 | SET_IN6_LINKLOCAL_IFINDEX (gate.sin6.sin6_addr, 0); | |
515 | } | |
516 | #endif /* KAME */ | |
517 | ||
518 | if (rtm->rtm_type == RTM_GET || rtm->rtm_type == RTM_ADD) | |
519 | rib_add_ipv6 (ZEBRA_ROUTE_KERNEL, zebra_flags, | |
520 | &p, &gate.sin6.sin6_addr, ifindex, 0); | |
521 | else | |
522 | rib_delete_ipv6 (ZEBRA_ROUTE_KERNEL, zebra_flags, | |
523 | &p, &gate.sin6.sin6_addr, ifindex, 0); | |
524 | } | |
525 | #endif /* HAVE_IPV6 */ | |
526 | } | |
527 | ||
528 | /* Interface function for the kernel routing table updates. Support | |
529 | for RTM_CHANGE will be needed. */ | |
530 | int | |
531 | rtm_write (int message, | |
532 | union sockunion *dest, | |
533 | union sockunion *mask, | |
534 | union sockunion *gate, | |
535 | unsigned int index, | |
536 | int zebra_flags, | |
537 | int metric) | |
538 | { | |
539 | int ret; | |
540 | caddr_t pnt; | |
541 | struct interface *ifp; | |
542 | struct sockaddr_in tmp_gate; | |
543 | #ifdef HAVE_IPV6 | |
544 | struct sockaddr_in6 tmp_gate6; | |
545 | #endif /* HAVE_IPV6 */ | |
546 | ||
547 | /* Sequencial number of routing message. */ | |
548 | static int msg_seq = 0; | |
549 | ||
550 | /* Struct of rt_msghdr and buffer for storing socket's data. */ | |
551 | struct | |
552 | { | |
553 | struct rt_msghdr rtm; | |
554 | char buf[512]; | |
555 | } msg; | |
556 | ||
557 | memset (&tmp_gate, 0, sizeof (struct sockaddr_in)); | |
558 | tmp_gate.sin_family = AF_INET; | |
559 | #ifdef HAVE_SIN_LEN | |
560 | tmp_gate.sin_len = sizeof (struct sockaddr_in); | |
561 | #endif /* HAVE_SIN_LEN */ | |
562 | ||
563 | #ifdef HAVE_IPV6 | |
564 | memset (&tmp_gate6, 0, sizeof (struct sockaddr_in6)); | |
565 | tmp_gate6.sin6_family = AF_INET6; | |
566 | #ifdef SIN6_LEN | |
567 | tmp_gate6.sin6_len = sizeof (struct sockaddr_in6); | |
568 | #endif /* SIN6_LEN */ | |
569 | #endif /* HAVE_IPV6 */ | |
570 | ||
571 | if (routing_sock < 0) | |
572 | return ZEBRA_ERR_EPERM; | |
573 | ||
574 | /* Clear and set rt_msghdr values */ | |
575 | memset (&msg, 0, sizeof (struct rt_msghdr)); | |
576 | msg.rtm.rtm_version = RTM_VERSION; | |
577 | msg.rtm.rtm_type = message; | |
578 | msg.rtm.rtm_seq = msg_seq++; | |
579 | msg.rtm.rtm_addrs = RTA_DST; | |
580 | msg.rtm.rtm_addrs |= RTA_GATEWAY; | |
581 | msg.rtm.rtm_flags = RTF_UP; | |
582 | msg.rtm.rtm_index = index; | |
583 | ||
584 | if (metric != 0) | |
585 | { | |
586 | msg.rtm.rtm_rmx.rmx_hopcount = metric; | |
587 | msg.rtm.rtm_inits |= RTV_HOPCOUNT; | |
588 | } | |
589 | ||
590 | ifp = if_lookup_by_index (index); | |
591 | ||
592 | if (gate && message == RTM_ADD) | |
593 | msg.rtm.rtm_flags |= RTF_GATEWAY; | |
594 | ||
595 | if (! gate && message == RTM_ADD && ifp && | |
596 | (ifp->flags & IFF_POINTOPOINT) == 0) | |
597 | msg.rtm.rtm_flags |= RTF_CLONING; | |
598 | ||
599 | /* If no protocol specific gateway is specified, use link | |
600 | address for gateway. */ | |
601 | if (! gate) | |
602 | { | |
603 | if (!ifp) | |
604 | { | |
605 | zlog_warn ("no gateway found for interface index %d", index); | |
606 | return -1; | |
607 | } | |
608 | gate = (union sockunion *) & ifp->sdl; | |
609 | } | |
610 | ||
611 | if (mask) | |
612 | msg.rtm.rtm_addrs |= RTA_NETMASK; | |
613 | else if (message == RTM_ADD) | |
614 | msg.rtm.rtm_flags |= RTF_HOST; | |
615 | ||
616 | /* Tagging route with flags */ | |
617 | msg.rtm.rtm_flags |= (RTF_PROTO1); | |
618 | ||
619 | /* Additional flags. */ | |
620 | if (zebra_flags & ZEBRA_FLAG_BLACKHOLE) | |
621 | msg.rtm.rtm_flags |= RTF_BLACKHOLE; | |
622 | ||
623 | #ifdef HAVE_SIN_LEN | |
624 | #define SOCKADDRSET(X,R) \ | |
625 | if (msg.rtm.rtm_addrs & (R)) \ | |
626 | { \ | |
627 | int len = ROUNDUP ((X)->sa.sa_len); \ | |
628 | memcpy (pnt, (caddr_t)(X), len); \ | |
629 | pnt += len; \ | |
630 | } | |
631 | #else | |
632 | #define SOCKADDRSET(X,R) \ | |
633 | if (msg.rtm.rtm_addrs & (R)) \ | |
634 | { \ | |
635 | int len = ROUNDUP (sizeof((X)->sa)); \ | |
636 | memcpy (pnt, (caddr_t)(X), len); \ | |
637 | pnt += len; \ | |
638 | } | |
639 | #endif /* HAVE_SIN_LEN */ | |
640 | ||
641 | pnt = (caddr_t) msg.buf; | |
642 | ||
643 | /* Write each socket data into rtm message buffer */ | |
644 | SOCKADDRSET (dest, RTA_DST); | |
645 | SOCKADDRSET (gate, RTA_GATEWAY); | |
646 | SOCKADDRSET (mask, RTA_NETMASK); | |
647 | ||
648 | msg.rtm.rtm_msglen = pnt - (caddr_t) &msg; | |
649 | ||
650 | ret = write (routing_sock, &msg, msg.rtm.rtm_msglen); | |
651 | ||
652 | if (ret != msg.rtm.rtm_msglen) | |
653 | { | |
654 | if (errno == EEXIST) | |
655 | return ZEBRA_ERR_RTEXIST; | |
656 | if (errno == ENETUNREACH) | |
657 | return ZEBRA_ERR_RTUNREACH; | |
658 | ||
659 | zlog_warn ("write : %s (%d)", strerror (errno), errno); | |
660 | return -1; | |
661 | } | |
662 | return 0; | |
663 | } | |
664 | ||
665 | \f | |
666 | #include "thread.h" | |
667 | #include "zebra/zserv.h" | |
668 | ||
669 | extern struct thread_master *master; | |
670 | ||
671 | /* For debug purpose. */ | |
672 | void | |
673 | rtmsg_debug (struct rt_msghdr *rtm) | |
674 | { | |
675 | char *type = "Unknown"; | |
676 | struct message *mes; | |
677 | ||
678 | for (mes = rtm_type_str; mes->str; mes++) | |
679 | if (mes->key == rtm->rtm_type) | |
680 | { | |
681 | type = mes->str; | |
682 | break; | |
683 | } | |
684 | ||
685 | zlog_info ("Kernel: Len: %d Type: %s", rtm->rtm_msglen, type); | |
686 | rtm_flag_dump (rtm->rtm_flags); | |
687 | zlog_info ("Kernel: message seq %d", rtm->rtm_seq); | |
688 | zlog_info ("Kernel: pid %d", rtm->rtm_pid); | |
689 | } | |
690 | ||
691 | /* This is pretty gross, better suggestions welcome -- mhandler */ | |
692 | #ifndef RTAX_MAX | |
693 | #ifdef RTA_NUMBITS | |
694 | #define RTAX_MAX RTA_NUMBITS | |
695 | #else | |
696 | #define RTAX_MAX 8 | |
697 | #endif /* RTA_NUMBITS */ | |
698 | #endif /* RTAX_MAX */ | |
699 | ||
700 | /* Kernel routing table and interface updates via routing socket. */ | |
701 | int | |
702 | kernel_read (struct thread *thread) | |
703 | { | |
704 | int sock; | |
705 | int nbytes; | |
706 | struct rt_msghdr *rtm; | |
707 | ||
708 | union | |
709 | { | |
710 | /* Routing information. */ | |
711 | struct | |
712 | { | |
713 | struct rt_msghdr rtm; | |
714 | struct sockaddr addr[RTAX_MAX]; | |
715 | } r; | |
716 | ||
717 | /* Interface information. */ | |
718 | struct | |
719 | { | |
720 | struct if_msghdr ifm; | |
721 | struct sockaddr addr[RTAX_MAX]; | |
722 | } im; | |
723 | ||
724 | /* Interface address information. */ | |
725 | struct | |
726 | { | |
727 | struct ifa_msghdr ifa; | |
728 | struct sockaddr addr[RTAX_MAX]; | |
729 | } ia; | |
730 | ||
731 | #ifdef RTM_IFANNOUNCE | |
732 | /* Interface arrival/departure */ | |
733 | struct | |
734 | { | |
735 | struct if_announcemsghdr ifan; | |
736 | struct sockaddr addr[RTAX_MAX]; | |
737 | } ian; | |
738 | #endif /* RTM_IFANNOUNCE */ | |
739 | ||
740 | } buf; | |
741 | ||
742 | /* Fetch routing socket. */ | |
743 | sock = THREAD_FD (thread); | |
744 | ||
745 | nbytes= read (sock, &buf, sizeof buf); | |
746 | ||
747 | if (nbytes <= 0) | |
748 | { | |
749 | if (nbytes < 0 && errno != EWOULDBLOCK && errno != EAGAIN) | |
750 | zlog_warn ("routing socket error: %s", strerror (errno)); | |
751 | return 0; | |
752 | } | |
753 | ||
754 | thread_add_read (master, kernel_read, NULL, sock); | |
755 | ||
756 | #ifdef DEBUG | |
757 | rtmsg_debug (&buf.r.rtm); | |
758 | #endif /* DEBUG */ | |
759 | ||
760 | rtm = &buf.r.rtm; | |
761 | ||
762 | switch (rtm->rtm_type) | |
763 | { | |
764 | case RTM_ADD: | |
765 | case RTM_DELETE: | |
766 | rtm_read (rtm); | |
767 | break; | |
768 | case RTM_IFINFO: | |
769 | ifm_read (&buf.im.ifm); | |
770 | break; | |
771 | case RTM_NEWADDR: | |
772 | case RTM_DELADDR: | |
773 | ifam_read (&buf.ia.ifa); | |
774 | break; | |
775 | #ifdef RTM_IFANNOUNCE | |
776 | case RTM_IFANNOUNCE: | |
777 | ifan_read (&buf.ian.ifan); | |
778 | break; | |
779 | #endif /* RTM_IFANNOUNCE */ | |
780 | default: | |
781 | break; | |
782 | } | |
783 | return 0; | |
784 | } | |
785 | ||
786 | /* Make routing socket. */ | |
787 | void | |
788 | routing_socket () | |
789 | { | |
790 | routing_sock = socket (AF_ROUTE, SOCK_RAW, 0); | |
791 | ||
792 | if (routing_sock < 0) | |
793 | { | |
794 | zlog_warn ("Can't init kernel routing socket"); | |
795 | return; | |
796 | } | |
797 | ||
798 | if (fcntl (routing_sock, F_SETFL, O_NONBLOCK) < 0) | |
799 | zlog_warn ("Can't set O_NONBLOCK to routing socket"); | |
800 | ||
801 | /* kernel_read needs rewrite. */ | |
802 | thread_add_read (master, kernel_read, NULL, routing_sock); | |
803 | } | |
804 | ||
805 | /* Exported interface function. This function simply calls | |
806 | routing_socket (). */ | |
807 | void | |
808 | kernel_init () | |
809 | { | |
810 | routing_socket (); | |
811 | } |