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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" | |
edd7c245 | 34 | #include "privs.h" |
718e3744 | 35 | |
36 | #include "zebra/interface.h" | |
37 | #include "zebra/zserv.h" | |
38 | #include "zebra/debug.h" | |
39 | ||
edd7c245 | 40 | extern struct zebra_privs_t zserv_privs; |
9bcdb638 | 41 | extern struct zebra_t zebrad; |
edd7c245 | 42 | |
718e3744 | 43 | /* Socket length roundup function. */ |
44 | #define ROUNDUP(a) \ | |
45 | ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) | |
46 | ||
47 | /* And this macro is wrapper for handling sa_len. */ | |
30be8028 | 48 | #if defined(HAVE_SA_LEN) |
718e3744 | 49 | #define WRAPUP(X) ROUNDUP(((struct sockaddr *)(X))->sa_len) |
30be8028 | 50 | #elif defined(HAVE_IPV6) |
3e95a074 | 51 | #define WRAPUP(X) \ |
30be8028 | 52 | do { \ |
3e95a074 | 53 | (((struct sockaddr *)(X))->sa_family == AF_INET ? \ |
54 | ROUNDUP(sizeof(struct sockaddr_in)):\ | |
55 | (((struct sockaddr *)(X))->sa_family == AF_INET6 ? \ | |
56 | ROUNDUP(sizeof(struct sockaddr_in6)) : \ | |
57 | (((struct sockaddr *)(X))->sa_family == AF_LINK ? \ | |
30be8028 | 58 | ROUNDUP(sizeof(struct sockaddr_dl)) : sizeof(struct sockaddr)))) \ |
59 | } while (0) | |
60 | #else /* HAVE_IPV6 */ | |
61 | #define WRAPUP(X) \ | |
62 | (((struct sockaddr *)(X))->sa_family == AF_INET ? \ | |
63 | ROUNDUP(sizeof(struct sockaddr_in)):\ | |
64 | (((struct sockaddr *)(X))->sa_family == AF_LINK ? \ | |
65 | ROUNDUP(sizeof(struct sockaddr_dl)) : sizeof(struct sockaddr))) | |
718e3744 | 66 | #endif /* HAVE_SA_LEN */ |
67 | ||
68 | /* Routing socket message types. */ | |
69 | struct message rtm_type_str[] = | |
70 | { | |
71 | {RTM_ADD, "RTM_ADD"}, | |
72 | {RTM_DELETE, "RTM_DELETE"}, | |
73 | {RTM_CHANGE, "RTM_CHANGE"}, | |
74 | {RTM_GET, "RTM_GET"}, | |
75 | {RTM_LOSING, "RTM_LOSING"}, | |
76 | {RTM_REDIRECT, "RTM_REDIRECT"}, | |
77 | {RTM_MISS, "RTM_MISS"}, | |
78 | {RTM_LOCK, "RTM_LOCK"}, | |
79 | {RTM_OLDADD, "RTM_OLDADD"}, | |
80 | {RTM_OLDDEL, "RTM_OLDDEL"}, | |
81 | {RTM_RESOLVE, "RTM_RESOLVE"}, | |
82 | {RTM_NEWADDR, "RTM_NEWADDR"}, | |
83 | {RTM_DELADDR, "RTM_DELADDR"}, | |
84 | {RTM_IFINFO, "RTM_IFINFO"}, | |
85 | #ifdef RTM_OIFINFO | |
86 | {RTM_OIFINFO, "RTM_OIFINFO"}, | |
87 | #endif /* RTM_OIFINFO */ | |
88 | #ifdef RTM_NEWMADDR | |
89 | {RTM_NEWMADDR, "RTM_NEWMADDR"}, | |
90 | #endif /* RTM_NEWMADDR */ | |
91 | #ifdef RTM_DELMADDR | |
92 | {RTM_DELMADDR, "RTM_DELMADDR"}, | |
93 | #endif /* RTM_DELMADDR */ | |
94 | #ifdef RTM_IFANNOUNCE | |
95 | {RTM_IFANNOUNCE, "RTM_IFANNOUNCE"}, | |
96 | #endif /* RTM_IFANNOUNCE */ | |
97 | {0, NULL} | |
98 | }; | |
99 | ||
100 | struct message rtm_flag_str[] = | |
101 | { | |
102 | {RTF_UP, "UP"}, | |
103 | {RTF_GATEWAY, "GATEWAY"}, | |
104 | {RTF_HOST, "HOST"}, | |
105 | {RTF_REJECT, "REJECT"}, | |
106 | {RTF_DYNAMIC, "DYNAMIC"}, | |
107 | {RTF_MODIFIED, "MODIFIED"}, | |
108 | {RTF_DONE, "DONE"}, | |
109 | #ifdef RTF_MASK | |
110 | {RTF_MASK, "MASK"}, | |
111 | #endif /* RTF_MASK */ | |
112 | {RTF_CLONING, "CLONING"}, | |
113 | {RTF_XRESOLVE, "XRESOLVE"}, | |
114 | {RTF_LLINFO, "LLINFO"}, | |
115 | {RTF_STATIC, "STATIC"}, | |
116 | {RTF_BLACKHOLE, "BLACKHOLE"}, | |
117 | {RTF_PROTO1, "PROTO1"}, | |
118 | {RTF_PROTO2, "PROTO2"}, | |
119 | #ifdef RTF_PRCLONING | |
120 | {RTF_PRCLONING, "PRCLONING"}, | |
121 | #endif /* RTF_PRCLONING */ | |
122 | #ifdef RTF_WASCLONED | |
123 | {RTF_WASCLONED, "WASCLONED"}, | |
124 | #endif /* RTF_WASCLONED */ | |
125 | #ifdef RTF_PROTO3 | |
126 | {RTF_PROTO3, "PROTO3"}, | |
127 | #endif /* RTF_PROTO3 */ | |
128 | #ifdef RTF_PINNED | |
129 | {RTF_PINNED, "PINNED"}, | |
130 | #endif /* RTF_PINNED */ | |
131 | #ifdef RTF_LOCAL | |
132 | {RTF_LOCAL, "LOCAL"}, | |
133 | #endif /* RTF_LOCAL */ | |
134 | #ifdef RTF_BROADCAST | |
135 | {RTF_BROADCAST, "BROADCAST"}, | |
136 | #endif /* RTF_BROADCAST */ | |
137 | #ifdef RTF_MULTICAST | |
138 | {RTF_MULTICAST, "MULTICAST"}, | |
139 | #endif /* RTF_MULTICAST */ | |
140 | {0, NULL} | |
141 | }; | |
142 | ||
143 | /* Kernel routing update socket. */ | |
144 | int routing_sock = -1; | |
145 | ||
146 | /* Yes I'm checking ugly routing socket behavior. */ | |
147 | /* #define DEBUG */ | |
148 | ||
149 | /* Supported address family check. */ | |
150 | static int | |
151 | af_check (int family) | |
152 | { | |
153 | if (family == AF_INET) | |
154 | return 1; | |
155 | #ifdef HAVE_IPV6 | |
156 | if (family == AF_INET6) | |
157 | return 1; | |
158 | #endif /* HAVE_IPV6 */ | |
159 | return 0; | |
160 | } | |
161 | \f | |
162 | /* Dump routing table flag for debug purpose. */ | |
163 | void | |
164 | rtm_flag_dump (int flag) | |
165 | { | |
166 | struct message *mes; | |
167 | static char buf[BUFSIZ]; | |
168 | ||
81dfcaa2 | 169 | buf[0] = '0'; |
718e3744 | 170 | for (mes = rtm_flag_str; mes->key != 0; mes++) |
171 | { | |
172 | if (mes->key & flag) | |
173 | { | |
174 | strlcat (buf, mes->str, BUFSIZ); | |
175 | strlcat (buf, " ", BUFSIZ); | |
176 | } | |
177 | } | |
178 | zlog_info ("Kernel: %s", buf); | |
179 | } | |
180 | ||
181 | #ifdef RTM_IFANNOUNCE | |
182 | /* Interface adding function */ | |
183 | int | |
184 | ifan_read (struct if_announcemsghdr *ifan) | |
185 | { | |
186 | struct interface *ifp; | |
187 | ||
188 | ifp = if_lookup_by_index (ifan->ifan_index); | |
189 | if (ifp == NULL && ifan->ifan_what == IFAN_ARRIVAL) | |
190 | { | |
191 | /* Create Interface */ | |
192 | ifp = if_get_by_name (ifan->ifan_name); | |
193 | ifp->ifindex = ifan->ifan_index; | |
194 | ||
195 | if_add_update (ifp); | |
196 | } | |
197 | else if (ifp != NULL && ifan->ifan_what == IFAN_DEPARTURE) | |
198 | { | |
199 | if_delete_update (ifp); | |
200 | if_delete (ifp); | |
201 | } | |
202 | ||
203 | if_get_flags (ifp); | |
204 | if_get_mtu (ifp); | |
205 | if_get_metric (ifp); | |
206 | ||
207 | if (IS_ZEBRA_DEBUG_KERNEL) | |
208 | zlog_info ("interface %s index %d", ifp->name, ifp->ifindex); | |
209 | ||
210 | return 0; | |
211 | } | |
212 | #endif /* RTM_IFANNOUNCE */ | |
213 | ||
da26e3b6 | 214 | /* |
215 | * Handle struct if_msghdr obtained from reading routing socket or | |
216 | * sysctl (from interface_list). There may or may not be sockaddrs | |
217 | * present after the header. | |
218 | */ | |
718e3744 | 219 | int |
220 | ifm_read (struct if_msghdr *ifm) | |
221 | { | |
3e95a074 | 222 | struct interface *ifp = NULL; |
718e3744 | 223 | struct sockaddr_dl *sdl = NULL; |
3e95a074 | 224 | char ifname[IFNAMSIZ]; |
225 | ||
da26e3b6 | 226 | /* paranoia: sanity check structure */ |
227 | if (ifm->ifm_msglen < sizeof(struct if_msghdr)) | |
228 | { | |
229 | zlog_err ("ifm_read: ifm->ifm_msglen %d too short\n", | |
230 | ifm->ifm_msglen); | |
231 | return -1; | |
232 | } | |
233 | ||
234 | /* | |
235 | * Check for a sockaddr_dl following the message. | |
236 | */ | |
3e95a074 | 237 | #ifdef SUNOS_5 |
238 | int i; | |
239 | struct sockaddr *sa; | |
240 | u_char *cp = (u_char *)(ifm + 1); | |
718e3744 | 241 | |
3e95a074 | 242 | /* |
243 | * if_msghdr_t on 64 bit kernels in Solaris 9 and earlier versions | |
244 | * is 12 bytes larger than the 32 bit version, so make adjustment | |
245 | * here. | |
246 | */ | |
247 | sa = (struct sockaddr *)cp; | |
248 | if (sa->sa_family == AF_UNSPEC) | |
249 | cp = cp + 12; | |
250 | ||
251 | for (i = 1; i != 0; i <<= 1) | |
252 | { | |
253 | if (i & ifm->ifm_addrs) | |
254 | { | |
255 | sa = (struct sockaddr *)cp; | |
256 | cp += WRAPUP(sa); | |
257 | if (i & RTA_IFP) | |
258 | { | |
259 | sdl = (struct sockaddr_dl *)sa; | |
260 | break; | |
261 | } | |
262 | } | |
263 | } | |
da26e3b6 | 264 | /* |
265 | * After here, If RTA_IFP was set in ifm_addrs, sdl should point to | |
266 | * the sockaddr_dl. | |
267 | */ | |
3e95a074 | 268 | #else |
da26e3b6 | 269 | /* sockaddrs_present? */ |
270 | if (ifm->ifm_addrs) | |
271 | { | |
272 | if (ifm->ifm_addrs == RTA_IFP) | |
273 | { | |
274 | /* just the one we want */ | |
275 | sdl = (struct sockaddr_dl *)(ifm + 1); | |
276 | } | |
277 | else | |
278 | { | |
279 | /* | |
280 | * Not strictly an error, but more complicated parsing than | |
281 | * is implemented is required to handle this case. | |
282 | */ | |
283 | zlog_err ("ifm_read: addrs %x != RTA_IFP (unhandled, ignoring)\n", | |
284 | ifm->ifm_addrs); | |
285 | return -1; | |
286 | } | |
287 | } | |
288 | /* | |
289 | * Past here, either ifm_addrs == 0 or ifm_addrs == RTA_IFP and sdl | |
290 | * points to a RTA_IFP sockaddr. | |
291 | */ | |
3e95a074 | 292 | #endif |
718e3744 | 293 | |
da26e3b6 | 294 | /* Check that sdl, if present, is actually a sockaddr_dl before use. */ |
295 | if (sdl != NULL) | |
296 | switch (sdl->sdl_family) | |
297 | { | |
298 | case AF_LINK: | |
299 | /* Standard AF for link-layer address sockaddrs. */ | |
300 | case AF_DLI: | |
301 | /* | |
302 | * XXX Comment in NetBSD net/if_dl.h says AF_DLI, but this | |
303 | * seems wrong. Accept it for now. | |
304 | */ | |
305 | break; | |
306 | ||
307 | default: | |
308 | zlog_err ("ifm_read: sockaddr_dl bad AF %d\n", | |
309 | sdl->sdl_family); | |
310 | return -1; | |
311 | } | |
312 | ||
3e95a074 | 313 | /* |
da26e3b6 | 314 | * Look up on ifindex. This is useful if this is an up/down |
315 | * notification for an interface of which we are already aware. | |
316 | * (This happens on NetBSD 1.6.2, for example.) | |
3e95a074 | 317 | */ |
da26e3b6 | 318 | if (ifp == NULL) |
319 | ifp = if_lookup_by_index (ifm->ifm_index); | |
320 | ||
da26e3b6 | 321 | /* |
322 | * If lookup by index was unsuccessful and we have a name, try | |
323 | * looking up by name. Interfaces specified in the configuration | |
324 | * file for which the ifindex has not been determined will have | |
325 | * ifindex == -1, and such interfaces are found by this search, and | |
326 | * then their ifindex values can be filled in. | |
327 | */ | |
cb42c035 | 328 | if (ifp == NULL && sdl != NULL) |
3e95a074 | 329 | { |
da26e3b6 | 330 | /* |
331 | * paranoia: sanity check name length. nlen does not include | |
332 | * trailing zero, but IFNAMSIZ max length does. | |
333 | */ | |
334 | if (sdl->sdl_nlen >= IFNAMSIZ) | |
335 | { | |
336 | zlog_err ("ifm_read: illegal sdl_nlen %d\n", sdl->sdl_nlen); | |
337 | return -1; | |
338 | } | |
339 | ||
30be8028 | 340 | memcpy (ifname, sdl->sdl_data, sdl->sdl_nlen); |
3e95a074 | 341 | ifname[sdl->sdl_nlen] = '\0'; |
342 | ifp = if_lookup_by_name (ifname); | |
343 | } | |
718e3744 | 344 | |
da26e3b6 | 345 | /* |
346 | * If ifp does not exist or has an invalid index (-1), create or | |
347 | * fill in an interface. | |
348 | */ | |
3e95a074 | 349 | if ((ifp == NULL) || (ifp->ifindex == -1)) |
718e3744 | 350 | { |
351 | /* Check interface's address.*/ | |
352 | if (! (ifm->ifm_addrs & RTA_IFP)) | |
353 | { | |
da26e3b6 | 354 | zlog_warn ("Interface index %d (new) missing RTA_IFP sockaddr\n", |
718e3744 | 355 | ifm->ifm_index); |
356 | return -1; | |
357 | } | |
358 | ||
da26e3b6 | 359 | /* |
360 | * paranoia: sdl-finding code above guarantees that sdl is | |
361 | * non-NULL and valid if RTA_IFP is set in ifm_addrs, so this | |
362 | * check is in theory not necessary. | |
363 | */ | |
364 | if (sdl == NULL) | |
365 | { | |
366 | zlog_warn ("ifm_read: no sockaddr_dl present"); | |
367 | return -1; | |
368 | } | |
369 | ||
3e95a074 | 370 | if (ifp == NULL) |
371 | ifp = if_create (sdl->sdl_data, sdl->sdl_nlen); | |
718e3744 | 372 | |
718e3744 | 373 | ifp->ifindex = ifm->ifm_index; |
374 | ifp->flags = ifm->ifm_flags; | |
375 | #if defined(__bsdi__) | |
376 | if_kvm_get_mtu (ifp); | |
377 | #else | |
378 | if_get_mtu (ifp); | |
379 | #endif /* __bsdi__ */ | |
380 | if_get_metric (ifp); | |
381 | ||
382 | /* Fetch hardware address. */ | |
383 | if (sdl->sdl_family != AF_LINK) | |
384 | { | |
385 | zlog_warn ("sockaddr_dl->sdl_family is not AF_LINK"); | |
386 | return -1; | |
387 | } | |
da26e3b6 | 388 | /* XXX sockaddr_dl can be larger than base structure */ |
718e3744 | 389 | memcpy (&ifp->sdl, sdl, sizeof (struct sockaddr_dl)); |
390 | ||
391 | if_add_update (ifp); | |
392 | } | |
393 | else | |
da26e3b6 | 394 | /* |
395 | * Interface structure exists. Adjust stored flags from | |
396 | * notification. If interface has up->down or down->up | |
397 | * transition, call state change routines (to adjust routes, | |
398 | * notify routing daemons, etc.). (Other flag changes are stored | |
399 | * but apparently do not trigger action.) | |
400 | */ | |
718e3744 | 401 | { |
718e3744 | 402 | if (if_is_up (ifp)) |
403 | { | |
404 | ifp->flags = ifm->ifm_flags; | |
405 | if (! if_is_up (ifp)) | |
406 | if_down (ifp); | |
407 | } | |
408 | else | |
409 | { | |
410 | ifp->flags = ifm->ifm_flags; | |
411 | if (if_is_up (ifp)) | |
412 | if_up (ifp); | |
413 | } | |
414 | } | |
415 | ||
416 | #ifdef HAVE_NET_RT_IFLIST | |
417 | ifp->stats = ifm->ifm_data; | |
418 | #endif /* HAVE_NET_RT_IFLIST */ | |
419 | ||
420 | if (IS_ZEBRA_DEBUG_KERNEL) | |
421 | zlog_info ("interface %s index %d", ifp->name, ifp->ifindex); | |
422 | ||
423 | return 0; | |
424 | } | |
425 | \f | |
426 | /* Address read from struct ifa_msghdr. */ | |
427 | void | |
428 | ifam_read_mesg (struct ifa_msghdr *ifm, | |
429 | union sockunion *addr, | |
430 | union sockunion *mask, | |
431 | union sockunion *dest) | |
432 | { | |
433 | caddr_t pnt, end; | |
434 | ||
435 | pnt = (caddr_t)(ifm + 1); | |
436 | end = ((caddr_t)ifm) + ifm->ifam_msglen; | |
437 | ||
438 | #define IFAMADDRGET(X,R) \ | |
439 | if (ifm->ifam_addrs & (R)) \ | |
440 | { \ | |
441 | int len = WRAPUP(pnt); \ | |
442 | if (((X) != NULL) && af_check (((struct sockaddr *)pnt)->sa_family)) \ | |
443 | memcpy ((caddr_t)(X), pnt, len); \ | |
444 | pnt += len; \ | |
445 | } | |
446 | #define IFAMMASKGET(X,R) \ | |
447 | if (ifm->ifam_addrs & (R)) \ | |
448 | { \ | |
449 | int len = WRAPUP(pnt); \ | |
450 | if ((X) != NULL) \ | |
451 | memcpy ((caddr_t)(X), pnt, len); \ | |
452 | pnt += len; \ | |
453 | } | |
454 | ||
455 | /* Be sure structure is cleared */ | |
456 | memset (mask, 0, sizeof (union sockunion)); | |
457 | memset (addr, 0, sizeof (union sockunion)); | |
458 | memset (dest, 0, sizeof (union sockunion)); | |
459 | ||
460 | /* We fetch each socket variable into sockunion. */ | |
461 | IFAMADDRGET (NULL, RTA_DST); | |
462 | IFAMADDRGET (NULL, RTA_GATEWAY); | |
463 | IFAMMASKGET (mask, RTA_NETMASK); | |
464 | IFAMADDRGET (NULL, RTA_GENMASK); | |
465 | IFAMADDRGET (NULL, RTA_IFP); | |
466 | IFAMADDRGET (addr, RTA_IFA); | |
467 | IFAMADDRGET (NULL, RTA_AUTHOR); | |
468 | IFAMADDRGET (dest, RTA_BRD); | |
469 | ||
470 | /* Assert read up end point matches to end point */ | |
471 | if (pnt != end) | |
472 | zlog_warn ("ifam_read() does't read all socket data"); | |
473 | } | |
474 | ||
475 | /* Interface's address information get. */ | |
476 | int | |
477 | ifam_read (struct ifa_msghdr *ifam) | |
478 | { | |
479 | struct interface *ifp; | |
480 | union sockunion addr, mask, gate; | |
481 | ||
482 | /* Check does this interface exist or not. */ | |
483 | ifp = if_lookup_by_index (ifam->ifam_index); | |
484 | if (ifp == NULL) | |
485 | { | |
486 | zlog_warn ("no interface for index %d", ifam->ifam_index); | |
487 | return -1; | |
488 | } | |
489 | ||
490 | /* Allocate and read address information. */ | |
491 | ifam_read_mesg (ifam, &addr, &mask, &gate); | |
492 | ||
493 | /* Check interface flag for implicit up of the interface. */ | |
494 | if_refresh (ifp); | |
495 | ||
496 | /* Add connected address. */ | |
497 | switch (sockunion_family (&addr)) | |
498 | { | |
499 | case AF_INET: | |
500 | if (ifam->ifam_type == RTM_NEWADDR) | |
501 | connected_add_ipv4 (ifp, 0, &addr.sin.sin_addr, | |
502 | ip_masklen (mask.sin.sin_addr), | |
503 | &gate.sin.sin_addr, NULL); | |
504 | else | |
505 | connected_delete_ipv4 (ifp, 0, &addr.sin.sin_addr, | |
506 | ip_masklen (mask.sin.sin_addr), | |
507 | &gate.sin.sin_addr, NULL); | |
508 | break; | |
509 | #ifdef HAVE_IPV6 | |
510 | case AF_INET6: | |
511 | /* Unset interface index from link-local address when IPv6 stack | |
512 | is KAME. */ | |
513 | if (IN6_IS_ADDR_LINKLOCAL (&addr.sin6.sin6_addr)) | |
514 | SET_IN6_LINKLOCAL_IFINDEX (addr.sin6.sin6_addr, 0); | |
515 | ||
516 | if (ifam->ifam_type == RTM_NEWADDR) | |
517 | connected_add_ipv6 (ifp, | |
518 | &addr.sin6.sin6_addr, | |
519 | ip6_masklen (mask.sin6.sin6_addr), | |
520 | &gate.sin6.sin6_addr); | |
521 | else | |
522 | connected_delete_ipv6 (ifp, | |
523 | &addr.sin6.sin6_addr, | |
524 | ip6_masklen (mask.sin6.sin6_addr), | |
525 | &gate.sin6.sin6_addr); | |
526 | break; | |
527 | #endif /* HAVE_IPV6 */ | |
528 | default: | |
529 | /* Unsupported family silently ignore... */ | |
530 | break; | |
531 | } | |
532 | return 0; | |
533 | } | |
534 | \f | |
535 | /* Interface function for reading kernel routing table information. */ | |
536 | int | |
537 | rtm_read_mesg (struct rt_msghdr *rtm, | |
538 | union sockunion *dest, | |
539 | union sockunion *mask, | |
540 | union sockunion *gate) | |
541 | { | |
542 | caddr_t pnt, end; | |
543 | ||
544 | /* Pnt points out socket data start point. */ | |
545 | pnt = (caddr_t)(rtm + 1); | |
546 | end = ((caddr_t)rtm) + rtm->rtm_msglen; | |
547 | ||
548 | /* rt_msghdr version check. */ | |
549 | if (rtm->rtm_version != RTM_VERSION) | |
550 | zlog (NULL, LOG_WARNING, | |
551 | "Routing message version different %d should be %d." | |
552 | "This may cause problem\n", rtm->rtm_version, RTM_VERSION); | |
553 | ||
554 | #define RTMADDRGET(X,R) \ | |
555 | if (rtm->rtm_addrs & (R)) \ | |
556 | { \ | |
557 | int len = WRAPUP (pnt); \ | |
558 | if (((X) != NULL) && af_check (((struct sockaddr *)pnt)->sa_family)) \ | |
559 | memcpy ((caddr_t)(X), pnt, len); \ | |
560 | pnt += len; \ | |
561 | } | |
562 | #define RTMMASKGET(X,R) \ | |
563 | if (rtm->rtm_addrs & (R)) \ | |
564 | { \ | |
565 | int len = WRAPUP (pnt); \ | |
566 | if ((X) != NULL) \ | |
567 | memcpy ((caddr_t)(X), pnt, len); \ | |
568 | pnt += len; \ | |
569 | } | |
570 | ||
571 | /* Be sure structure is cleared */ | |
572 | memset (dest, 0, sizeof (union sockunion)); | |
573 | memset (gate, 0, sizeof (union sockunion)); | |
574 | memset (mask, 0, sizeof (union sockunion)); | |
575 | ||
576 | /* We fetch each socket variable into sockunion. */ | |
577 | RTMADDRGET (dest, RTA_DST); | |
578 | RTMADDRGET (gate, RTA_GATEWAY); | |
579 | RTMMASKGET (mask, RTA_NETMASK); | |
580 | RTMADDRGET (NULL, RTA_GENMASK); | |
581 | RTMADDRGET (NULL, RTA_IFP); | |
582 | RTMADDRGET (NULL, RTA_IFA); | |
583 | RTMADDRGET (NULL, RTA_AUTHOR); | |
584 | RTMADDRGET (NULL, RTA_BRD); | |
585 | ||
586 | /* If there is netmask information set it's family same as | |
587 | destination family*/ | |
588 | if (rtm->rtm_addrs & RTA_NETMASK) | |
589 | mask->sa.sa_family = dest->sa.sa_family; | |
590 | ||
591 | /* Assert read up to the end of pointer. */ | |
592 | if (pnt != end) | |
593 | zlog (NULL, LOG_WARNING, "rtm_read() does't read all socket data."); | |
594 | ||
595 | return rtm->rtm_flags; | |
596 | } | |
597 | ||
598 | void | |
599 | rtm_read (struct rt_msghdr *rtm) | |
600 | { | |
601 | int flags; | |
602 | u_char zebra_flags; | |
603 | union sockunion dest, mask, gate; | |
604 | ||
605 | zebra_flags = 0; | |
606 | ||
607 | /* Discard self send message. */ | |
608 | if (rtm->rtm_type != RTM_GET | |
609 | && (rtm->rtm_pid == pid || rtm->rtm_pid == old_pid)) | |
610 | return; | |
611 | ||
612 | /* Read destination and netmask and gateway from rtm message | |
613 | structure. */ | |
614 | flags = rtm_read_mesg (rtm, &dest, &mask, &gate); | |
615 | ||
616 | #ifdef RTF_CLONED /*bsdi, netbsd 1.6*/ | |
617 | if (flags & RTF_CLONED) | |
618 | return; | |
619 | #endif | |
620 | #ifdef RTF_WASCLONED /*freebsd*/ | |
621 | if (flags & RTF_WASCLONED) | |
622 | return; | |
623 | #endif | |
624 | ||
625 | if ((rtm->rtm_type == RTM_ADD) && ! (flags & RTF_UP)) | |
626 | return; | |
627 | ||
628 | /* This is connected route. */ | |
629 | if (! (flags & RTF_GATEWAY)) | |
630 | return; | |
631 | ||
632 | if (flags & RTF_PROTO1) | |
633 | SET_FLAG (zebra_flags, ZEBRA_FLAG_SELFROUTE); | |
634 | ||
635 | /* This is persistent route. */ | |
636 | if (flags & RTF_STATIC) | |
637 | SET_FLAG (zebra_flags, ZEBRA_FLAG_STATIC); | |
638 | ||
81dfcaa2 | 639 | /* This is a reject or blackhole route */ |
640 | if (flags & RTF_REJECT) | |
641 | SET_FLAG (zebra_flags, ZEBRA_FLAG_REJECT); | |
642 | if (flags & RTF_BLACKHOLE) | |
643 | SET_FLAG (zebra_flags, ZEBRA_FLAG_BLACKHOLE); | |
644 | ||
718e3744 | 645 | if (dest.sa.sa_family == AF_INET) |
646 | { | |
647 | struct prefix_ipv4 p; | |
648 | ||
649 | p.family = AF_INET; | |
650 | p.prefix = dest.sin.sin_addr; | |
651 | if (flags & RTF_HOST) | |
652 | p.prefixlen = IPV4_MAX_PREFIXLEN; | |
653 | else | |
654 | p.prefixlen = ip_masklen (mask.sin.sin_addr); | |
655 | ||
656 | if (rtm->rtm_type == RTM_GET || rtm->rtm_type == RTM_ADD) | |
657 | rib_add_ipv4 (ZEBRA_ROUTE_KERNEL, zebra_flags, | |
658 | &p, &gate.sin.sin_addr, 0, 0, 0, 0); | |
659 | else | |
660 | rib_delete_ipv4 (ZEBRA_ROUTE_KERNEL, zebra_flags, | |
661 | &p, &gate.sin.sin_addr, 0, 0); | |
662 | } | |
663 | #ifdef HAVE_IPV6 | |
664 | if (dest.sa.sa_family == AF_INET6) | |
665 | { | |
666 | struct prefix_ipv6 p; | |
667 | unsigned int ifindex = 0; | |
668 | ||
669 | p.family = AF_INET6; | |
670 | p.prefix = dest.sin6.sin6_addr; | |
671 | if (flags & RTF_HOST) | |
672 | p.prefixlen = IPV6_MAX_PREFIXLEN; | |
673 | else | |
674 | p.prefixlen = ip6_masklen (mask.sin6.sin6_addr); | |
675 | ||
676 | #ifdef KAME | |
677 | if (IN6_IS_ADDR_LINKLOCAL (&gate.sin6.sin6_addr)) | |
678 | { | |
679 | ifindex = IN6_LINKLOCAL_IFINDEX (gate.sin6.sin6_addr); | |
680 | SET_IN6_LINKLOCAL_IFINDEX (gate.sin6.sin6_addr, 0); | |
681 | } | |
682 | #endif /* KAME */ | |
683 | ||
684 | if (rtm->rtm_type == RTM_GET || rtm->rtm_type == RTM_ADD) | |
685 | rib_add_ipv6 (ZEBRA_ROUTE_KERNEL, zebra_flags, | |
686 | &p, &gate.sin6.sin6_addr, ifindex, 0); | |
687 | else | |
688 | rib_delete_ipv6 (ZEBRA_ROUTE_KERNEL, zebra_flags, | |
689 | &p, &gate.sin6.sin6_addr, ifindex, 0); | |
690 | } | |
691 | #endif /* HAVE_IPV6 */ | |
692 | } | |
693 | ||
694 | /* Interface function for the kernel routing table updates. Support | |
695 | for RTM_CHANGE will be needed. */ | |
696 | int | |
697 | rtm_write (int message, | |
698 | union sockunion *dest, | |
699 | union sockunion *mask, | |
700 | union sockunion *gate, | |
701 | unsigned int index, | |
702 | int zebra_flags, | |
703 | int metric) | |
704 | { | |
705 | int ret; | |
706 | caddr_t pnt; | |
707 | struct interface *ifp; | |
708 | struct sockaddr_in tmp_gate; | |
709 | #ifdef HAVE_IPV6 | |
710 | struct sockaddr_in6 tmp_gate6; | |
711 | #endif /* HAVE_IPV6 */ | |
712 | ||
713 | /* Sequencial number of routing message. */ | |
714 | static int msg_seq = 0; | |
715 | ||
716 | /* Struct of rt_msghdr and buffer for storing socket's data. */ | |
717 | struct | |
718 | { | |
719 | struct rt_msghdr rtm; | |
720 | char buf[512]; | |
721 | } msg; | |
722 | ||
723 | memset (&tmp_gate, 0, sizeof (struct sockaddr_in)); | |
724 | tmp_gate.sin_family = AF_INET; | |
725 | #ifdef HAVE_SIN_LEN | |
726 | tmp_gate.sin_len = sizeof (struct sockaddr_in); | |
727 | #endif /* HAVE_SIN_LEN */ | |
728 | ||
729 | #ifdef HAVE_IPV6 | |
730 | memset (&tmp_gate6, 0, sizeof (struct sockaddr_in6)); | |
731 | tmp_gate6.sin6_family = AF_INET6; | |
732 | #ifdef SIN6_LEN | |
733 | tmp_gate6.sin6_len = sizeof (struct sockaddr_in6); | |
734 | #endif /* SIN6_LEN */ | |
735 | #endif /* HAVE_IPV6 */ | |
736 | ||
737 | if (routing_sock < 0) | |
738 | return ZEBRA_ERR_EPERM; | |
739 | ||
740 | /* Clear and set rt_msghdr values */ | |
741 | memset (&msg, 0, sizeof (struct rt_msghdr)); | |
742 | msg.rtm.rtm_version = RTM_VERSION; | |
743 | msg.rtm.rtm_type = message; | |
744 | msg.rtm.rtm_seq = msg_seq++; | |
745 | msg.rtm.rtm_addrs = RTA_DST; | |
746 | msg.rtm.rtm_addrs |= RTA_GATEWAY; | |
747 | msg.rtm.rtm_flags = RTF_UP; | |
748 | msg.rtm.rtm_index = index; | |
749 | ||
750 | if (metric != 0) | |
751 | { | |
752 | msg.rtm.rtm_rmx.rmx_hopcount = metric; | |
753 | msg.rtm.rtm_inits |= RTV_HOPCOUNT; | |
754 | } | |
755 | ||
756 | ifp = if_lookup_by_index (index); | |
757 | ||
758 | if (gate && message == RTM_ADD) | |
759 | msg.rtm.rtm_flags |= RTF_GATEWAY; | |
760 | ||
761 | if (! gate && message == RTM_ADD && ifp && | |
762 | (ifp->flags & IFF_POINTOPOINT) == 0) | |
763 | msg.rtm.rtm_flags |= RTF_CLONING; | |
764 | ||
765 | /* If no protocol specific gateway is specified, use link | |
766 | address for gateway. */ | |
767 | if (! gate) | |
768 | { | |
769 | if (!ifp) | |
770 | { | |
771 | zlog_warn ("no gateway found for interface index %d", index); | |
772 | return -1; | |
773 | } | |
774 | gate = (union sockunion *) & ifp->sdl; | |
775 | } | |
776 | ||
777 | if (mask) | |
778 | msg.rtm.rtm_addrs |= RTA_NETMASK; | |
779 | else if (message == RTM_ADD) | |
780 | msg.rtm.rtm_flags |= RTF_HOST; | |
781 | ||
782 | /* Tagging route with flags */ | |
783 | msg.rtm.rtm_flags |= (RTF_PROTO1); | |
784 | ||
785 | /* Additional flags. */ | |
786 | if (zebra_flags & ZEBRA_FLAG_BLACKHOLE) | |
787 | msg.rtm.rtm_flags |= RTF_BLACKHOLE; | |
81dfcaa2 | 788 | if (zebra_flags & ZEBRA_FLAG_REJECT) |
789 | msg.rtm.rtm_flags |= RTF_REJECT; | |
790 | ||
718e3744 | 791 | |
792 | #ifdef HAVE_SIN_LEN | |
793 | #define SOCKADDRSET(X,R) \ | |
794 | if (msg.rtm.rtm_addrs & (R)) \ | |
795 | { \ | |
796 | int len = ROUNDUP ((X)->sa.sa_len); \ | |
797 | memcpy (pnt, (caddr_t)(X), len); \ | |
798 | pnt += len; \ | |
799 | } | |
800 | #else | |
801 | #define SOCKADDRSET(X,R) \ | |
802 | if (msg.rtm.rtm_addrs & (R)) \ | |
803 | { \ | |
804 | int len = ROUNDUP (sizeof((X)->sa)); \ | |
805 | memcpy (pnt, (caddr_t)(X), len); \ | |
806 | pnt += len; \ | |
807 | } | |
808 | #endif /* HAVE_SIN_LEN */ | |
809 | ||
810 | pnt = (caddr_t) msg.buf; | |
811 | ||
812 | /* Write each socket data into rtm message buffer */ | |
813 | SOCKADDRSET (dest, RTA_DST); | |
814 | SOCKADDRSET (gate, RTA_GATEWAY); | |
815 | SOCKADDRSET (mask, RTA_NETMASK); | |
816 | ||
817 | msg.rtm.rtm_msglen = pnt - (caddr_t) &msg; | |
818 | ||
819 | ret = write (routing_sock, &msg, msg.rtm.rtm_msglen); | |
820 | ||
821 | if (ret != msg.rtm.rtm_msglen) | |
822 | { | |
823 | if (errno == EEXIST) | |
824 | return ZEBRA_ERR_RTEXIST; | |
825 | if (errno == ENETUNREACH) | |
826 | return ZEBRA_ERR_RTUNREACH; | |
827 | ||
828 | zlog_warn ("write : %s (%d)", strerror (errno), errno); | |
829 | return -1; | |
830 | } | |
831 | return 0; | |
832 | } | |
833 | ||
834 | \f | |
835 | #include "thread.h" | |
836 | #include "zebra/zserv.h" | |
837 | ||
718e3744 | 838 | /* For debug purpose. */ |
839 | void | |
840 | rtmsg_debug (struct rt_msghdr *rtm) | |
841 | { | |
842 | char *type = "Unknown"; | |
843 | struct message *mes; | |
844 | ||
845 | for (mes = rtm_type_str; mes->str; mes++) | |
846 | if (mes->key == rtm->rtm_type) | |
847 | { | |
848 | type = mes->str; | |
849 | break; | |
850 | } | |
851 | ||
852 | zlog_info ("Kernel: Len: %d Type: %s", rtm->rtm_msglen, type); | |
853 | rtm_flag_dump (rtm->rtm_flags); | |
854 | zlog_info ("Kernel: message seq %d", rtm->rtm_seq); | |
855 | zlog_info ("Kernel: pid %d", rtm->rtm_pid); | |
856 | } | |
857 | ||
858 | /* This is pretty gross, better suggestions welcome -- mhandler */ | |
859 | #ifndef RTAX_MAX | |
860 | #ifdef RTA_NUMBITS | |
861 | #define RTAX_MAX RTA_NUMBITS | |
862 | #else | |
863 | #define RTAX_MAX 8 | |
864 | #endif /* RTA_NUMBITS */ | |
865 | #endif /* RTAX_MAX */ | |
866 | ||
867 | /* Kernel routing table and interface updates via routing socket. */ | |
868 | int | |
869 | kernel_read (struct thread *thread) | |
870 | { | |
871 | int sock; | |
872 | int nbytes; | |
873 | struct rt_msghdr *rtm; | |
874 | ||
875 | union | |
876 | { | |
877 | /* Routing information. */ | |
878 | struct | |
879 | { | |
880 | struct rt_msghdr rtm; | |
881 | struct sockaddr addr[RTAX_MAX]; | |
882 | } r; | |
883 | ||
884 | /* Interface information. */ | |
885 | struct | |
886 | { | |
887 | struct if_msghdr ifm; | |
888 | struct sockaddr addr[RTAX_MAX]; | |
889 | } im; | |
890 | ||
891 | /* Interface address information. */ | |
892 | struct | |
893 | { | |
894 | struct ifa_msghdr ifa; | |
895 | struct sockaddr addr[RTAX_MAX]; | |
896 | } ia; | |
897 | ||
898 | #ifdef RTM_IFANNOUNCE | |
899 | /* Interface arrival/departure */ | |
900 | struct | |
901 | { | |
902 | struct if_announcemsghdr ifan; | |
903 | struct sockaddr addr[RTAX_MAX]; | |
904 | } ian; | |
905 | #endif /* RTM_IFANNOUNCE */ | |
906 | ||
907 | } buf; | |
908 | ||
909 | /* Fetch routing socket. */ | |
910 | sock = THREAD_FD (thread); | |
911 | ||
912 | nbytes= read (sock, &buf, sizeof buf); | |
913 | ||
914 | if (nbytes <= 0) | |
915 | { | |
916 | if (nbytes < 0 && errno != EWOULDBLOCK && errno != EAGAIN) | |
917 | zlog_warn ("routing socket error: %s", strerror (errno)); | |
918 | return 0; | |
919 | } | |
920 | ||
9bcdb638 | 921 | thread_add_read (zebrad.master, kernel_read, NULL, sock); |
718e3744 | 922 | |
726f9b2b | 923 | if (IS_ZEBRA_DEBUG_KERNEL) |
924 | rtmsg_debug (&buf.r.rtm); | |
718e3744 | 925 | |
926 | rtm = &buf.r.rtm; | |
927 | ||
da26e3b6 | 928 | if (rtm->rtm_msglen != nbytes) |
929 | { | |
930 | zlog_warn ("kernel_read: rtm->rtm_msglen %d, nbytes %d, type %d\n", | |
931 | rtm->rtm_msglen, nbytes, rtm->rtm_type); | |
932 | return -1; | |
933 | } | |
934 | ||
718e3744 | 935 | switch (rtm->rtm_type) |
936 | { | |
937 | case RTM_ADD: | |
938 | case RTM_DELETE: | |
939 | rtm_read (rtm); | |
940 | break; | |
941 | case RTM_IFINFO: | |
942 | ifm_read (&buf.im.ifm); | |
943 | break; | |
944 | case RTM_NEWADDR: | |
945 | case RTM_DELADDR: | |
946 | ifam_read (&buf.ia.ifa); | |
947 | break; | |
948 | #ifdef RTM_IFANNOUNCE | |
949 | case RTM_IFANNOUNCE: | |
950 | ifan_read (&buf.ian.ifan); | |
951 | break; | |
952 | #endif /* RTM_IFANNOUNCE */ | |
953 | default: | |
726f9b2b | 954 | if (IS_ZEBRA_DEBUG_KERNEL) |
955 | zlog_info("Unprocessed RTM_type: %d", rtm->rtm_type); | |
718e3744 | 956 | break; |
957 | } | |
958 | return 0; | |
959 | } | |
960 | ||
961 | /* Make routing socket. */ | |
962 | void | |
963 | routing_socket () | |
964 | { | |
edd7c245 | 965 | if ( zserv_privs.change (ZPRIVS_RAISE) ) |
966 | zlog_err ("routing_socket: Can't raise privileges"); | |
967 | ||
718e3744 | 968 | routing_sock = socket (AF_ROUTE, SOCK_RAW, 0); |
969 | ||
970 | if (routing_sock < 0) | |
971 | { | |
edd7c245 | 972 | if ( zserv_privs.change (ZPRIVS_LOWER) ) |
973 | zlog_err ("routing_socket: Can't lower privileges"); | |
718e3744 | 974 | zlog_warn ("Can't init kernel routing socket"); |
975 | return; | |
976 | } | |
977 | ||
978 | if (fcntl (routing_sock, F_SETFL, O_NONBLOCK) < 0) | |
979 | zlog_warn ("Can't set O_NONBLOCK to routing socket"); | |
edd7c245 | 980 | if ( zserv_privs.change (ZPRIVS_LOWER) ) |
981 | zlog_err ("routing_socket: Can't lower privileges"); | |
718e3744 | 982 | |
983 | /* kernel_read needs rewrite. */ | |
9bcdb638 | 984 | thread_add_read (zebrad.master, kernel_read, NULL, routing_sock); |
718e3744 | 985 | } |
986 | ||
987 | /* Exported interface function. This function simply calls | |
988 | routing_socket (). */ | |
989 | void | |
990 | kernel_init () | |
991 | { | |
992 | routing_socket (); | |
993 | } |