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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 | |
4bfbea8c | 43 | /* |
44 | * Given a sockaddr length, round it up to include pad bytes following | |
45 | * it. Assumes the kernel pads to sizeof(long). | |
46 | * | |
47 | * XXX: why is ROUNDUP(0) sizeof(long)? 0 is an illegal sockaddr | |
48 | * length anyway (< sizeof (struct sockaddr)), so this shouldn't | |
49 | * matter. | |
50 | */ | |
718e3744 | 51 | #define ROUNDUP(a) \ |
52 | ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) | |
53 | ||
4bfbea8c | 54 | /* |
55 | * Given a pointer (sockaddr or void *), return the number of bytes | |
56 | * taken up by the sockaddr and any padding needed for alignment. | |
57 | */ | |
30be8028 | 58 | #if defined(HAVE_SA_LEN) |
4bfbea8c | 59 | #define SAROUNDUP(X) ROUNDUP(((struct sockaddr *)(X))->sa_len) |
30be8028 | 60 | #elif defined(HAVE_IPV6) |
4bfbea8c | 61 | /* |
62 | * One would hope all fixed-size structure definitions are aligned, | |
63 | * but round them up nonetheless. | |
64 | */ | |
65 | #define SAROUNDUP(X) \ | |
3e95a074 | 66 | (((struct sockaddr *)(X))->sa_family == AF_INET ? \ |
67 | ROUNDUP(sizeof(struct sockaddr_in)):\ | |
68 | (((struct sockaddr *)(X))->sa_family == AF_INET6 ? \ | |
69 | ROUNDUP(sizeof(struct sockaddr_in6)) : \ | |
70 | (((struct sockaddr *)(X))->sa_family == AF_LINK ? \ | |
c50ae8ba | 71 | ROUNDUP(sizeof(struct sockaddr_dl)) : sizeof(struct sockaddr)))) |
30be8028 | 72 | #else /* HAVE_IPV6 */ |
4bfbea8c | 73 | #define SAROUNDUP(X) \ |
30be8028 | 74 | (((struct sockaddr *)(X))->sa_family == AF_INET ? \ |
75 | ROUNDUP(sizeof(struct sockaddr_in)):\ | |
76 | (((struct sockaddr *)(X))->sa_family == AF_LINK ? \ | |
77 | ROUNDUP(sizeof(struct sockaddr_dl)) : sizeof(struct sockaddr))) | |
718e3744 | 78 | #endif /* HAVE_SA_LEN */ |
79 | ||
62debbbe | 80 | #define RTA_ADDR_GET(DEST, RTA, RTMADDRS, PNT) \ |
81 | if ((RTMADDRS) & (RTA)) \ | |
82 | { \ | |
83 | int len = SAROUNDUP ((PNT)); \ | |
ea6f82b9 | 84 | if ( ((DEST) != NULL) && \ |
62debbbe | 85 | af_check (((struct sockaddr *)(PNT))->sa_family)) \ |
86 | memcpy ((caddr_t)(DEST), (PNT), len); \ | |
87 | (PNT) += len; \ | |
88 | } | |
89 | #define RTA_ATTR_GET(DEST, RTA, RTMADDRS, PNT) \ | |
90 | if ((RTMADDRS) & (RTA)) \ | |
91 | { \ | |
92 | int len = SAROUNDUP ((PNT)); \ | |
ea6f82b9 | 93 | if ( ((DEST) != NULL) ) \ |
62debbbe | 94 | memcpy ((caddr_t)(DEST), (PNT), len); \ |
95 | (PNT) += len; \ | |
96 | } | |
97 | ||
718e3744 | 98 | /* Routing socket message types. */ |
99 | struct message rtm_type_str[] = | |
100 | { | |
101 | {RTM_ADD, "RTM_ADD"}, | |
102 | {RTM_DELETE, "RTM_DELETE"}, | |
103 | {RTM_CHANGE, "RTM_CHANGE"}, | |
104 | {RTM_GET, "RTM_GET"}, | |
105 | {RTM_LOSING, "RTM_LOSING"}, | |
106 | {RTM_REDIRECT, "RTM_REDIRECT"}, | |
107 | {RTM_MISS, "RTM_MISS"}, | |
108 | {RTM_LOCK, "RTM_LOCK"}, | |
109 | {RTM_OLDADD, "RTM_OLDADD"}, | |
110 | {RTM_OLDDEL, "RTM_OLDDEL"}, | |
111 | {RTM_RESOLVE, "RTM_RESOLVE"}, | |
112 | {RTM_NEWADDR, "RTM_NEWADDR"}, | |
113 | {RTM_DELADDR, "RTM_DELADDR"}, | |
114 | {RTM_IFINFO, "RTM_IFINFO"}, | |
115 | #ifdef RTM_OIFINFO | |
116 | {RTM_OIFINFO, "RTM_OIFINFO"}, | |
117 | #endif /* RTM_OIFINFO */ | |
118 | #ifdef RTM_NEWMADDR | |
119 | {RTM_NEWMADDR, "RTM_NEWMADDR"}, | |
120 | #endif /* RTM_NEWMADDR */ | |
121 | #ifdef RTM_DELMADDR | |
122 | {RTM_DELMADDR, "RTM_DELMADDR"}, | |
123 | #endif /* RTM_DELMADDR */ | |
124 | #ifdef RTM_IFANNOUNCE | |
125 | {RTM_IFANNOUNCE, "RTM_IFANNOUNCE"}, | |
126 | #endif /* RTM_IFANNOUNCE */ | |
127 | {0, NULL} | |
128 | }; | |
129 | ||
130 | struct message rtm_flag_str[] = | |
131 | { | |
132 | {RTF_UP, "UP"}, | |
133 | {RTF_GATEWAY, "GATEWAY"}, | |
134 | {RTF_HOST, "HOST"}, | |
135 | {RTF_REJECT, "REJECT"}, | |
136 | {RTF_DYNAMIC, "DYNAMIC"}, | |
137 | {RTF_MODIFIED, "MODIFIED"}, | |
138 | {RTF_DONE, "DONE"}, | |
139 | #ifdef RTF_MASK | |
140 | {RTF_MASK, "MASK"}, | |
141 | #endif /* RTF_MASK */ | |
142 | {RTF_CLONING, "CLONING"}, | |
143 | {RTF_XRESOLVE, "XRESOLVE"}, | |
144 | {RTF_LLINFO, "LLINFO"}, | |
145 | {RTF_STATIC, "STATIC"}, | |
146 | {RTF_BLACKHOLE, "BLACKHOLE"}, | |
147 | {RTF_PROTO1, "PROTO1"}, | |
148 | {RTF_PROTO2, "PROTO2"}, | |
149 | #ifdef RTF_PRCLONING | |
150 | {RTF_PRCLONING, "PRCLONING"}, | |
151 | #endif /* RTF_PRCLONING */ | |
152 | #ifdef RTF_WASCLONED | |
153 | {RTF_WASCLONED, "WASCLONED"}, | |
154 | #endif /* RTF_WASCLONED */ | |
155 | #ifdef RTF_PROTO3 | |
156 | {RTF_PROTO3, "PROTO3"}, | |
157 | #endif /* RTF_PROTO3 */ | |
158 | #ifdef RTF_PINNED | |
159 | {RTF_PINNED, "PINNED"}, | |
160 | #endif /* RTF_PINNED */ | |
161 | #ifdef RTF_LOCAL | |
162 | {RTF_LOCAL, "LOCAL"}, | |
163 | #endif /* RTF_LOCAL */ | |
164 | #ifdef RTF_BROADCAST | |
165 | {RTF_BROADCAST, "BROADCAST"}, | |
166 | #endif /* RTF_BROADCAST */ | |
167 | #ifdef RTF_MULTICAST | |
168 | {RTF_MULTICAST, "MULTICAST"}, | |
169 | #endif /* RTF_MULTICAST */ | |
170 | {0, NULL} | |
171 | }; | |
172 | ||
173 | /* Kernel routing update socket. */ | |
174 | int routing_sock = -1; | |
175 | ||
176 | /* Yes I'm checking ugly routing socket behavior. */ | |
177 | /* #define DEBUG */ | |
178 | ||
179 | /* Supported address family check. */ | |
62debbbe | 180 | static int inline |
718e3744 | 181 | af_check (int family) |
182 | { | |
183 | if (family == AF_INET) | |
184 | return 1; | |
185 | #ifdef HAVE_IPV6 | |
186 | if (family == AF_INET6) | |
187 | return 1; | |
188 | #endif /* HAVE_IPV6 */ | |
189 | return 0; | |
190 | } | |
191 | \f | |
192 | /* Dump routing table flag for debug purpose. */ | |
b6178002 | 193 | static void |
718e3744 | 194 | rtm_flag_dump (int flag) |
195 | { | |
196 | struct message *mes; | |
197 | static char buf[BUFSIZ]; | |
198 | ||
cced60dd | 199 | buf[0] = '\0'; |
718e3744 | 200 | for (mes = rtm_flag_str; mes->key != 0; mes++) |
201 | { | |
202 | if (mes->key & flag) | |
203 | { | |
204 | strlcat (buf, mes->str, BUFSIZ); | |
205 | strlcat (buf, " ", BUFSIZ); | |
206 | } | |
207 | } | |
b6178002 | 208 | zlog_debug ("Kernel: %s", buf); |
718e3744 | 209 | } |
210 | ||
211 | #ifdef RTM_IFANNOUNCE | |
212 | /* Interface adding function */ | |
213 | int | |
214 | ifan_read (struct if_announcemsghdr *ifan) | |
215 | { | |
216 | struct interface *ifp; | |
217 | ||
218 | ifp = if_lookup_by_index (ifan->ifan_index); | |
219 | if (ifp == NULL && ifan->ifan_what == IFAN_ARRIVAL) | |
220 | { | |
221 | /* Create Interface */ | |
08dbfb69 | 222 | ifp = if_get_by_name_len(ifan->ifan_name, |
223 | strnlen(ifan->ifan_name, | |
224 | sizeof(ifan->ifan_name))); | |
718e3744 | 225 | ifp->ifindex = ifan->ifan_index; |
226 | ||
227 | if_add_update (ifp); | |
228 | } | |
229 | else if (ifp != NULL && ifan->ifan_what == IFAN_DEPARTURE) | |
6eb8827d | 230 | if_delete_update (ifp); |
718e3744 | 231 | |
232 | if_get_flags (ifp); | |
233 | if_get_mtu (ifp); | |
234 | if_get_metric (ifp); | |
235 | ||
236 | if (IS_ZEBRA_DEBUG_KERNEL) | |
b6178002 | 237 | zlog_debug ("interface %s index %d", ifp->name, ifp->ifindex); |
718e3744 | 238 | |
239 | return 0; | |
240 | } | |
241 | #endif /* RTM_IFANNOUNCE */ | |
242 | ||
da26e3b6 | 243 | /* |
244 | * Handle struct if_msghdr obtained from reading routing socket or | |
245 | * sysctl (from interface_list). There may or may not be sockaddrs | |
246 | * present after the header. | |
247 | */ | |
718e3744 | 248 | int |
249 | ifm_read (struct if_msghdr *ifm) | |
250 | { | |
3e95a074 | 251 | struct interface *ifp = NULL; |
718e3744 | 252 | struct sockaddr_dl *sdl = NULL; |
4bfbea8c | 253 | void *cp; |
254 | unsigned int i; | |
3e95a074 | 255 | |
da26e3b6 | 256 | /* paranoia: sanity check structure */ |
257 | if (ifm->ifm_msglen < sizeof(struct if_msghdr)) | |
258 | { | |
259 | zlog_err ("ifm_read: ifm->ifm_msglen %d too short\n", | |
260 | ifm->ifm_msglen); | |
261 | return -1; | |
262 | } | |
263 | ||
264 | /* | |
4bfbea8c | 265 | * Check for a sockaddr_dl following the message. First, point to |
266 | * where a socakddr might be if one follows the message. | |
da26e3b6 | 267 | */ |
4bfbea8c | 268 | cp = (void *)(ifm + 1); |
718e3744 | 269 | |
4bfbea8c | 270 | #ifdef SUNOS_5 |
3e95a074 | 271 | /* |
4bfbea8c | 272 | * XXX This behavior should be narrowed to only the kernel versions |
273 | * for which the structures returned do not match the headers. | |
274 | * | |
3e95a074 | 275 | * if_msghdr_t on 64 bit kernels in Solaris 9 and earlier versions |
4bfbea8c | 276 | * is 12 bytes larger than the 32 bit version. |
3e95a074 | 277 | */ |
4bfbea8c | 278 | if (((struct sockaddr *) cp)->sa_family == AF_UNSPEC) |
3e95a074 | 279 | cp = cp + 12; |
4bfbea8c | 280 | #endif |
3e95a074 | 281 | |
4bfbea8c | 282 | /* |
283 | * Check for each sockaddr in turn, advancing over it. After this | |
284 | * loop, sdl should point to a sockaddr_dl iff one was present. | |
285 | */ | |
3e95a074 | 286 | for (i = 1; i != 0; i <<= 1) |
287 | { | |
4bfbea8c | 288 | if (i & ifm->ifm_addrs) |
3e95a074 | 289 | { |
4bfbea8c | 290 | if (i == RTA_IFP) |
3e95a074 | 291 | { |
4bfbea8c | 292 | sdl = (struct sockaddr_dl *)cp; |
3e95a074 | 293 | break; |
294 | } | |
6a250b09 | 295 | /* XXX warning: pointer of type `void *' used in arithmetic */ |
4bfbea8c | 296 | cp += SAROUNDUP(cp); |
3e95a074 | 297 | } |
298 | } | |
4bfbea8c | 299 | |
300 | /* Ensure that sdl, if present, is actually a sockaddr_dl. */ | |
301 | if (sdl != NULL && sdl->sdl_family != AF_LINK) | |
da26e3b6 | 302 | { |
4bfbea8c | 303 | zlog_err ("ifm_read: sockaddr_dl bad AF %d\n", |
304 | sdl->sdl_family); | |
305 | return -1; | |
da26e3b6 | 306 | } |
da26e3b6 | 307 | |
3e95a074 | 308 | /* |
4bfbea8c | 309 | * Look up on ifindex first, because ifindices are the primary |
310 | * handle for interfaces across the user/kernel boundary. (Some | |
311 | * messages, such as up/down status changes on NetBSD, do not | |
312 | * include a sockaddr_dl). | |
3e95a074 | 313 | */ |
4bfbea8c | 314 | ifp = if_lookup_by_index (ifm->ifm_index); |
da26e3b6 | 315 | |
da26e3b6 | 316 | /* |
317 | * If lookup by index was unsuccessful and we have a name, try | |
318 | * looking up by name. Interfaces specified in the configuration | |
319 | * file for which the ifindex has not been determined will have | |
d2fc8896 | 320 | * ifindex == IFINDEX_INTERNAL, and such interfaces are found by this search, |
321 | * and then their ifindex values can be filled in. | |
da26e3b6 | 322 | */ |
cb42c035 | 323 | if (ifp == NULL && sdl != NULL) |
3e95a074 | 324 | { |
da26e3b6 | 325 | /* |
326 | * paranoia: sanity check name length. nlen does not include | |
327 | * trailing zero, but IFNAMSIZ max length does. | |
a349198f | 328 | * |
329 | * XXX Is this test correct? Should it be '>=' or '>'? And is it even | |
330 | * necessary now that we are using if_lookup_by_name_len? | |
da26e3b6 | 331 | */ |
332 | if (sdl->sdl_nlen >= IFNAMSIZ) | |
333 | { | |
334 | zlog_err ("ifm_read: illegal sdl_nlen %d\n", sdl->sdl_nlen); | |
335 | return -1; | |
336 | } | |
337 | ||
a349198f | 338 | ifp = if_lookup_by_name_len (sdl->sdl_data, sdl->sdl_nlen); |
3e95a074 | 339 | } |
718e3744 | 340 | |
da26e3b6 | 341 | /* |
d2fc8896 | 342 | * If ifp does not exist or has an invalid index (IFINDEX_INTERNAL), create or |
da26e3b6 | 343 | * fill in an interface. |
344 | */ | |
d2fc8896 | 345 | if ((ifp == NULL) || (ifp->ifindex == IFINDEX_INTERNAL)) |
718e3744 | 346 | { |
da26e3b6 | 347 | /* |
4bfbea8c | 348 | * To create or fill in an interface, a sockaddr_dl (via |
349 | * RTA_IFP) is required. | |
da26e3b6 | 350 | */ |
351 | if (sdl == NULL) | |
352 | { | |
4bfbea8c | 353 | zlog_warn ("Interface index %d (new) missing RTA_IFP sockaddr_dl\n", |
354 | ifm->ifm_index); | |
da26e3b6 | 355 | return -1; |
356 | } | |
357 | ||
3e95a074 | 358 | if (ifp == NULL) |
4bfbea8c | 359 | /* Interface that zebra was not previously aware of, so create. */ |
3e95a074 | 360 | ifp = if_create (sdl->sdl_data, sdl->sdl_nlen); |
718e3744 | 361 | |
4bfbea8c | 362 | /* |
363 | * Fill in newly created interface structure, or larval | |
d2fc8896 | 364 | * structure with ifindex IFINDEX_INTERNAL. |
4bfbea8c | 365 | */ |
718e3744 | 366 | ifp->ifindex = ifm->ifm_index; |
367 | ifp->flags = ifm->ifm_flags; | |
368 | #if defined(__bsdi__) | |
369 | if_kvm_get_mtu (ifp); | |
370 | #else | |
371 | if_get_mtu (ifp); | |
372 | #endif /* __bsdi__ */ | |
373 | if_get_metric (ifp); | |
374 | ||
4bfbea8c | 375 | /* |
376 | * XXX sockaddr_dl contents can be larger than the structure | |
377 | * definition, so the user of the stored structure must be | |
378 | * careful not to read off the end. | |
379 | */ | |
718e3744 | 380 | memcpy (&ifp->sdl, sdl, sizeof (struct sockaddr_dl)); |
381 | ||
382 | if_add_update (ifp); | |
383 | } | |
384 | else | |
da26e3b6 | 385 | /* |
386 | * Interface structure exists. Adjust stored flags from | |
387 | * notification. If interface has up->down or down->up | |
388 | * transition, call state change routines (to adjust routes, | |
389 | * notify routing daemons, etc.). (Other flag changes are stored | |
390 | * but apparently do not trigger action.) | |
391 | */ | |
718e3744 | 392 | { |
718e3744 | 393 | if (if_is_up (ifp)) |
394 | { | |
395 | ifp->flags = ifm->ifm_flags; | |
396 | if (! if_is_up (ifp)) | |
6eb8827d | 397 | { |
398 | if_down (ifp); | |
399 | #ifndef RTM_IFANNOUNCE | |
400 | /* No RTM_IFANNOUNCE on this platform, so we can never | |
401 | * distinguish between down and delete. We must presume | |
402 | * it has been deleted. | |
403 | * Eg, Solaris will not notify us of unplumb. | |
404 | * | |
405 | * XXX: Fixme - this should be runtime detected | |
406 | * So that a binary compiled on a system with IFANNOUNCE | |
407 | * will still behave correctly if run on a platform without | |
408 | */ | |
409 | if_delete_update (ifp); | |
410 | #endif /* RTM_IFANNOUNCE */ | |
411 | } | |
718e3744 | 412 | } |
413 | else | |
414 | { | |
415 | ifp->flags = ifm->ifm_flags; | |
416 | if (if_is_up (ifp)) | |
417 | if_up (ifp); | |
418 | } | |
419 | } | |
420 | ||
421 | #ifdef HAVE_NET_RT_IFLIST | |
422 | ifp->stats = ifm->ifm_data; | |
423 | #endif /* HAVE_NET_RT_IFLIST */ | |
424 | ||
425 | if (IS_ZEBRA_DEBUG_KERNEL) | |
b6178002 | 426 | zlog_debug ("interface %s index %d", ifp->name, ifp->ifindex); |
718e3744 | 427 | |
428 | return 0; | |
429 | } | |
430 | \f | |
431 | /* Address read from struct ifa_msghdr. */ | |
432 | void | |
433 | ifam_read_mesg (struct ifa_msghdr *ifm, | |
434 | union sockunion *addr, | |
435 | union sockunion *mask, | |
436 | union sockunion *dest) | |
437 | { | |
438 | caddr_t pnt, end; | |
439 | ||
440 | pnt = (caddr_t)(ifm + 1); | |
441 | end = ((caddr_t)ifm) + ifm->ifam_msglen; | |
442 | ||
718e3744 | 443 | /* Be sure structure is cleared */ |
444 | memset (mask, 0, sizeof (union sockunion)); | |
445 | memset (addr, 0, sizeof (union sockunion)); | |
446 | memset (dest, 0, sizeof (union sockunion)); | |
447 | ||
448 | /* We fetch each socket variable into sockunion. */ | |
62debbbe | 449 | RTA_ADDR_GET (NULL, RTA_DST, ifm->ifam_addrs, pnt); |
450 | RTA_ADDR_GET (NULL, RTA_GATEWAY, ifm->ifam_addrs, pnt); | |
451 | RTA_ATTR_GET (mask, RTA_NETMASK, ifm->ifam_addrs, pnt); | |
452 | RTA_ADDR_GET (NULL, RTA_GENMASK, ifm->ifam_addrs, pnt); | |
453 | RTA_ADDR_GET (NULL, RTA_IFP, ifm->ifam_addrs, pnt); | |
454 | RTA_ADDR_GET (addr, RTA_IFA, ifm->ifam_addrs, pnt); | |
455 | RTA_ADDR_GET (NULL, RTA_AUTHOR, ifm->ifam_addrs, pnt); | |
456 | RTA_ADDR_GET (dest, RTA_BRD, ifm->ifam_addrs, pnt); | |
718e3744 | 457 | |
458 | /* Assert read up end point matches to end point */ | |
459 | if (pnt != end) | |
460 | zlog_warn ("ifam_read() does't read all socket data"); | |
461 | } | |
462 | ||
463 | /* Interface's address information get. */ | |
464 | int | |
465 | ifam_read (struct ifa_msghdr *ifam) | |
466 | { | |
467 | struct interface *ifp; | |
468 | union sockunion addr, mask, gate; | |
469 | ||
470 | /* Check does this interface exist or not. */ | |
471 | ifp = if_lookup_by_index (ifam->ifam_index); | |
472 | if (ifp == NULL) | |
473 | { | |
474 | zlog_warn ("no interface for index %d", ifam->ifam_index); | |
475 | return -1; | |
476 | } | |
477 | ||
478 | /* Allocate and read address information. */ | |
479 | ifam_read_mesg (ifam, &addr, &mask, &gate); | |
480 | ||
481 | /* Check interface flag for implicit up of the interface. */ | |
482 | if_refresh (ifp); | |
483 | ||
484 | /* Add connected address. */ | |
485 | switch (sockunion_family (&addr)) | |
486 | { | |
487 | case AF_INET: | |
488 | if (ifam->ifam_type == RTM_NEWADDR) | |
489 | connected_add_ipv4 (ifp, 0, &addr.sin.sin_addr, | |
490 | ip_masklen (mask.sin.sin_addr), | |
491 | &gate.sin.sin_addr, NULL); | |
492 | else | |
493 | connected_delete_ipv4 (ifp, 0, &addr.sin.sin_addr, | |
494 | ip_masklen (mask.sin.sin_addr), | |
495 | &gate.sin.sin_addr, NULL); | |
496 | break; | |
497 | #ifdef HAVE_IPV6 | |
498 | case AF_INET6: | |
499 | /* Unset interface index from link-local address when IPv6 stack | |
500 | is KAME. */ | |
501 | if (IN6_IS_ADDR_LINKLOCAL (&addr.sin6.sin6_addr)) | |
502 | SET_IN6_LINKLOCAL_IFINDEX (addr.sin6.sin6_addr, 0); | |
503 | ||
504 | if (ifam->ifam_type == RTM_NEWADDR) | |
505 | connected_add_ipv6 (ifp, | |
506 | &addr.sin6.sin6_addr, | |
507 | ip6_masklen (mask.sin6.sin6_addr), | |
508 | &gate.sin6.sin6_addr); | |
509 | else | |
510 | connected_delete_ipv6 (ifp, | |
511 | &addr.sin6.sin6_addr, | |
512 | ip6_masklen (mask.sin6.sin6_addr), | |
513 | &gate.sin6.sin6_addr); | |
514 | break; | |
515 | #endif /* HAVE_IPV6 */ | |
516 | default: | |
517 | /* Unsupported family silently ignore... */ | |
518 | break; | |
519 | } | |
520 | return 0; | |
521 | } | |
522 | \f | |
523 | /* Interface function for reading kernel routing table information. */ | |
524 | int | |
525 | rtm_read_mesg (struct rt_msghdr *rtm, | |
526 | union sockunion *dest, | |
527 | union sockunion *mask, | |
528 | union sockunion *gate) | |
529 | { | |
530 | caddr_t pnt, end; | |
531 | ||
532 | /* Pnt points out socket data start point. */ | |
533 | pnt = (caddr_t)(rtm + 1); | |
534 | end = ((caddr_t)rtm) + rtm->rtm_msglen; | |
535 | ||
536 | /* rt_msghdr version check. */ | |
537 | if (rtm->rtm_version != RTM_VERSION) | |
538 | zlog (NULL, LOG_WARNING, | |
539 | "Routing message version different %d should be %d." | |
540 | "This may cause problem\n", rtm->rtm_version, RTM_VERSION); | |
62debbbe | 541 | |
718e3744 | 542 | /* Be sure structure is cleared */ |
543 | memset (dest, 0, sizeof (union sockunion)); | |
544 | memset (gate, 0, sizeof (union sockunion)); | |
545 | memset (mask, 0, sizeof (union sockunion)); | |
546 | ||
547 | /* We fetch each socket variable into sockunion. */ | |
62debbbe | 548 | RTA_ADDR_GET (dest, RTA_DST, rtm->rtm_addrs, pnt); |
549 | RTA_ADDR_GET (gate, RTA_GATEWAY, rtm->rtm_addrs, pnt); | |
550 | RTA_ATTR_GET (mask, RTA_NETMASK, rtm->rtm_addrs, pnt); | |
551 | RTA_ADDR_GET (NULL, RTA_GENMASK, rtm->rtm_addrs, pnt); | |
552 | RTA_ADDR_GET (NULL, RTA_IFP, rtm->rtm_addrs, pnt); | |
553 | RTA_ADDR_GET (NULL, RTA_IFA, rtm->rtm_addrs, pnt); | |
554 | RTA_ADDR_GET (NULL, RTA_AUTHOR, rtm->rtm_addrs, pnt); | |
555 | RTA_ADDR_GET (NULL, RTA_BRD, rtm->rtm_addrs, pnt); | |
718e3744 | 556 | |
557 | /* If there is netmask information set it's family same as | |
558 | destination family*/ | |
559 | if (rtm->rtm_addrs & RTA_NETMASK) | |
560 | mask->sa.sa_family = dest->sa.sa_family; | |
561 | ||
562 | /* Assert read up to the end of pointer. */ | |
563 | if (pnt != end) | |
564 | zlog (NULL, LOG_WARNING, "rtm_read() does't read all socket data."); | |
565 | ||
566 | return rtm->rtm_flags; | |
567 | } | |
568 | ||
569 | void | |
570 | rtm_read (struct rt_msghdr *rtm) | |
571 | { | |
572 | int flags; | |
573 | u_char zebra_flags; | |
574 | union sockunion dest, mask, gate; | |
575 | ||
576 | zebra_flags = 0; | |
577 | ||
578 | /* Discard self send message. */ | |
579 | if (rtm->rtm_type != RTM_GET | |
580 | && (rtm->rtm_pid == pid || rtm->rtm_pid == old_pid)) | |
581 | return; | |
582 | ||
583 | /* Read destination and netmask and gateway from rtm message | |
584 | structure. */ | |
585 | flags = rtm_read_mesg (rtm, &dest, &mask, &gate); | |
586 | ||
587 | #ifdef RTF_CLONED /*bsdi, netbsd 1.6*/ | |
588 | if (flags & RTF_CLONED) | |
589 | return; | |
590 | #endif | |
591 | #ifdef RTF_WASCLONED /*freebsd*/ | |
592 | if (flags & RTF_WASCLONED) | |
593 | return; | |
594 | #endif | |
595 | ||
596 | if ((rtm->rtm_type == RTM_ADD) && ! (flags & RTF_UP)) | |
597 | return; | |
598 | ||
599 | /* This is connected route. */ | |
600 | if (! (flags & RTF_GATEWAY)) | |
601 | return; | |
602 | ||
603 | if (flags & RTF_PROTO1) | |
604 | SET_FLAG (zebra_flags, ZEBRA_FLAG_SELFROUTE); | |
605 | ||
606 | /* This is persistent route. */ | |
607 | if (flags & RTF_STATIC) | |
608 | SET_FLAG (zebra_flags, ZEBRA_FLAG_STATIC); | |
609 | ||
81dfcaa2 | 610 | /* This is a reject or blackhole route */ |
611 | if (flags & RTF_REJECT) | |
612 | SET_FLAG (zebra_flags, ZEBRA_FLAG_REJECT); | |
613 | if (flags & RTF_BLACKHOLE) | |
614 | SET_FLAG (zebra_flags, ZEBRA_FLAG_BLACKHOLE); | |
615 | ||
718e3744 | 616 | if (dest.sa.sa_family == AF_INET) |
617 | { | |
618 | struct prefix_ipv4 p; | |
619 | ||
620 | p.family = AF_INET; | |
621 | p.prefix = dest.sin.sin_addr; | |
622 | if (flags & RTF_HOST) | |
623 | p.prefixlen = IPV4_MAX_PREFIXLEN; | |
624 | else | |
625 | p.prefixlen = ip_masklen (mask.sin.sin_addr); | |
626 | ||
627 | if (rtm->rtm_type == RTM_GET || rtm->rtm_type == RTM_ADD) | |
628 | rib_add_ipv4 (ZEBRA_ROUTE_KERNEL, zebra_flags, | |
629 | &p, &gate.sin.sin_addr, 0, 0, 0, 0); | |
630 | else | |
631 | rib_delete_ipv4 (ZEBRA_ROUTE_KERNEL, zebra_flags, | |
632 | &p, &gate.sin.sin_addr, 0, 0); | |
633 | } | |
634 | #ifdef HAVE_IPV6 | |
635 | if (dest.sa.sa_family == AF_INET6) | |
636 | { | |
637 | struct prefix_ipv6 p; | |
638 | unsigned int ifindex = 0; | |
639 | ||
640 | p.family = AF_INET6; | |
641 | p.prefix = dest.sin6.sin6_addr; | |
642 | if (flags & RTF_HOST) | |
643 | p.prefixlen = IPV6_MAX_PREFIXLEN; | |
644 | else | |
645 | p.prefixlen = ip6_masklen (mask.sin6.sin6_addr); | |
646 | ||
647 | #ifdef KAME | |
648 | if (IN6_IS_ADDR_LINKLOCAL (&gate.sin6.sin6_addr)) | |
649 | { | |
650 | ifindex = IN6_LINKLOCAL_IFINDEX (gate.sin6.sin6_addr); | |
651 | SET_IN6_LINKLOCAL_IFINDEX (gate.sin6.sin6_addr, 0); | |
652 | } | |
653 | #endif /* KAME */ | |
654 | ||
655 | if (rtm->rtm_type == RTM_GET || rtm->rtm_type == RTM_ADD) | |
656 | rib_add_ipv6 (ZEBRA_ROUTE_KERNEL, zebra_flags, | |
be61c4eb | 657 | &p, &gate.sin6.sin6_addr, ifindex, 0, 0, 0); |
718e3744 | 658 | else |
659 | rib_delete_ipv6 (ZEBRA_ROUTE_KERNEL, zebra_flags, | |
660 | &p, &gate.sin6.sin6_addr, ifindex, 0); | |
661 | } | |
662 | #endif /* HAVE_IPV6 */ | |
663 | } | |
664 | ||
665 | /* Interface function for the kernel routing table updates. Support | |
666 | for RTM_CHANGE will be needed. */ | |
667 | int | |
668 | rtm_write (int message, | |
669 | union sockunion *dest, | |
670 | union sockunion *mask, | |
671 | union sockunion *gate, | |
672 | unsigned int index, | |
673 | int zebra_flags, | |
674 | int metric) | |
675 | { | |
676 | int ret; | |
677 | caddr_t pnt; | |
678 | struct interface *ifp; | |
679 | struct sockaddr_in tmp_gate; | |
680 | #ifdef HAVE_IPV6 | |
681 | struct sockaddr_in6 tmp_gate6; | |
682 | #endif /* HAVE_IPV6 */ | |
683 | ||
684 | /* Sequencial number of routing message. */ | |
685 | static int msg_seq = 0; | |
686 | ||
687 | /* Struct of rt_msghdr and buffer for storing socket's data. */ | |
688 | struct | |
689 | { | |
690 | struct rt_msghdr rtm; | |
691 | char buf[512]; | |
692 | } msg; | |
693 | ||
694 | memset (&tmp_gate, 0, sizeof (struct sockaddr_in)); | |
695 | tmp_gate.sin_family = AF_INET; | |
696 | #ifdef HAVE_SIN_LEN | |
697 | tmp_gate.sin_len = sizeof (struct sockaddr_in); | |
698 | #endif /* HAVE_SIN_LEN */ | |
699 | ||
700 | #ifdef HAVE_IPV6 | |
701 | memset (&tmp_gate6, 0, sizeof (struct sockaddr_in6)); | |
702 | tmp_gate6.sin6_family = AF_INET6; | |
703 | #ifdef SIN6_LEN | |
704 | tmp_gate6.sin6_len = sizeof (struct sockaddr_in6); | |
705 | #endif /* SIN6_LEN */ | |
706 | #endif /* HAVE_IPV6 */ | |
707 | ||
708 | if (routing_sock < 0) | |
709 | return ZEBRA_ERR_EPERM; | |
710 | ||
711 | /* Clear and set rt_msghdr values */ | |
712 | memset (&msg, 0, sizeof (struct rt_msghdr)); | |
713 | msg.rtm.rtm_version = RTM_VERSION; | |
714 | msg.rtm.rtm_type = message; | |
715 | msg.rtm.rtm_seq = msg_seq++; | |
716 | msg.rtm.rtm_addrs = RTA_DST; | |
717 | msg.rtm.rtm_addrs |= RTA_GATEWAY; | |
718 | msg.rtm.rtm_flags = RTF_UP; | |
719 | msg.rtm.rtm_index = index; | |
720 | ||
721 | if (metric != 0) | |
722 | { | |
723 | msg.rtm.rtm_rmx.rmx_hopcount = metric; | |
724 | msg.rtm.rtm_inits |= RTV_HOPCOUNT; | |
725 | } | |
726 | ||
727 | ifp = if_lookup_by_index (index); | |
728 | ||
729 | if (gate && message == RTM_ADD) | |
730 | msg.rtm.rtm_flags |= RTF_GATEWAY; | |
731 | ||
732 | if (! gate && message == RTM_ADD && ifp && | |
733 | (ifp->flags & IFF_POINTOPOINT) == 0) | |
734 | msg.rtm.rtm_flags |= RTF_CLONING; | |
735 | ||
736 | /* If no protocol specific gateway is specified, use link | |
737 | address for gateway. */ | |
738 | if (! gate) | |
739 | { | |
740 | if (!ifp) | |
741 | { | |
742 | zlog_warn ("no gateway found for interface index %d", index); | |
743 | return -1; | |
744 | } | |
745 | gate = (union sockunion *) & ifp->sdl; | |
746 | } | |
747 | ||
748 | if (mask) | |
749 | msg.rtm.rtm_addrs |= RTA_NETMASK; | |
750 | else if (message == RTM_ADD) | |
751 | msg.rtm.rtm_flags |= RTF_HOST; | |
752 | ||
753 | /* Tagging route with flags */ | |
754 | msg.rtm.rtm_flags |= (RTF_PROTO1); | |
755 | ||
756 | /* Additional flags. */ | |
757 | if (zebra_flags & ZEBRA_FLAG_BLACKHOLE) | |
758 | msg.rtm.rtm_flags |= RTF_BLACKHOLE; | |
81dfcaa2 | 759 | if (zebra_flags & ZEBRA_FLAG_REJECT) |
760 | msg.rtm.rtm_flags |= RTF_REJECT; | |
761 | ||
718e3744 | 762 | |
763 | #ifdef HAVE_SIN_LEN | |
764 | #define SOCKADDRSET(X,R) \ | |
765 | if (msg.rtm.rtm_addrs & (R)) \ | |
766 | { \ | |
767 | int len = ROUNDUP ((X)->sa.sa_len); \ | |
768 | memcpy (pnt, (caddr_t)(X), len); \ | |
769 | pnt += len; \ | |
770 | } | |
771 | #else | |
772 | #define SOCKADDRSET(X,R) \ | |
773 | if (msg.rtm.rtm_addrs & (R)) \ | |
774 | { \ | |
775 | int len = ROUNDUP (sizeof((X)->sa)); \ | |
776 | memcpy (pnt, (caddr_t)(X), len); \ | |
777 | pnt += len; \ | |
778 | } | |
779 | #endif /* HAVE_SIN_LEN */ | |
780 | ||
781 | pnt = (caddr_t) msg.buf; | |
782 | ||
783 | /* Write each socket data into rtm message buffer */ | |
784 | SOCKADDRSET (dest, RTA_DST); | |
785 | SOCKADDRSET (gate, RTA_GATEWAY); | |
786 | SOCKADDRSET (mask, RTA_NETMASK); | |
787 | ||
788 | msg.rtm.rtm_msglen = pnt - (caddr_t) &msg; | |
789 | ||
790 | ret = write (routing_sock, &msg, msg.rtm.rtm_msglen); | |
791 | ||
792 | if (ret != msg.rtm.rtm_msglen) | |
793 | { | |
794 | if (errno == EEXIST) | |
795 | return ZEBRA_ERR_RTEXIST; | |
796 | if (errno == ENETUNREACH) | |
797 | return ZEBRA_ERR_RTUNREACH; | |
798 | ||
6099b3b5 | 799 | zlog_warn ("write : %s (%d)", safe_strerror (errno), errno); |
718e3744 | 800 | return -1; |
801 | } | |
802 | return 0; | |
803 | } | |
804 | ||
805 | \f | |
806 | #include "thread.h" | |
807 | #include "zebra/zserv.h" | |
808 | ||
718e3744 | 809 | /* For debug purpose. */ |
b6178002 | 810 | static void |
718e3744 | 811 | rtmsg_debug (struct rt_msghdr *rtm) |
812 | { | |
6a250b09 | 813 | const char *type = "Unknown"; |
718e3744 | 814 | struct message *mes; |
815 | ||
816 | for (mes = rtm_type_str; mes->str; mes++) | |
817 | if (mes->key == rtm->rtm_type) | |
818 | { | |
819 | type = mes->str; | |
820 | break; | |
821 | } | |
822 | ||
b6178002 | 823 | zlog_debug ("Kernel: Len: %d Type: %s", rtm->rtm_msglen, type); |
718e3744 | 824 | rtm_flag_dump (rtm->rtm_flags); |
b6178002 | 825 | zlog_debug ("Kernel: message seq %d", rtm->rtm_seq); |
826 | zlog_debug ("Kernel: pid %d", rtm->rtm_pid); | |
718e3744 | 827 | } |
828 | ||
829 | /* This is pretty gross, better suggestions welcome -- mhandler */ | |
830 | #ifndef RTAX_MAX | |
831 | #ifdef RTA_NUMBITS | |
832 | #define RTAX_MAX RTA_NUMBITS | |
833 | #else | |
834 | #define RTAX_MAX 8 | |
835 | #endif /* RTA_NUMBITS */ | |
836 | #endif /* RTAX_MAX */ | |
837 | ||
838 | /* Kernel routing table and interface updates via routing socket. */ | |
839 | int | |
840 | kernel_read (struct thread *thread) | |
841 | { | |
842 | int sock; | |
843 | int nbytes; | |
844 | struct rt_msghdr *rtm; | |
845 | ||
dbee01fe | 846 | /* |
847 | * This must be big enough for any message the kernel might send. | |
b27900b7 | 848 | * Rather than determining how many sockaddrs of what size might be |
849 | * in each particular message, just use RTAX_MAX of sockaddr_storage | |
850 | * for each. Note that the sockaddrs must be after each message | |
851 | * definition, or rather after whichever happens to be the largest, | |
852 | * since the buffer needs to be big enough for a message and the | |
853 | * sockaddrs together. | |
dbee01fe | 854 | */ |
718e3744 | 855 | union |
856 | { | |
857 | /* Routing information. */ | |
858 | struct | |
859 | { | |
860 | struct rt_msghdr rtm; | |
b27900b7 | 861 | struct sockaddr_storage addr[RTAX_MAX]; |
718e3744 | 862 | } r; |
863 | ||
864 | /* Interface information. */ | |
865 | struct | |
866 | { | |
867 | struct if_msghdr ifm; | |
b27900b7 | 868 | struct sockaddr_storage addr[RTAX_MAX]; |
718e3744 | 869 | } im; |
870 | ||
871 | /* Interface address information. */ | |
872 | struct | |
873 | { | |
874 | struct ifa_msghdr ifa; | |
b27900b7 | 875 | struct sockaddr_storage addr[RTAX_MAX]; |
718e3744 | 876 | } ia; |
877 | ||
878 | #ifdef RTM_IFANNOUNCE | |
879 | /* Interface arrival/departure */ | |
880 | struct | |
881 | { | |
882 | struct if_announcemsghdr ifan; | |
b27900b7 | 883 | struct sockaddr_storage addr[RTAX_MAX]; |
718e3744 | 884 | } ian; |
885 | #endif /* RTM_IFANNOUNCE */ | |
886 | ||
887 | } buf; | |
888 | ||
889 | /* Fetch routing socket. */ | |
890 | sock = THREAD_FD (thread); | |
891 | ||
892 | nbytes= read (sock, &buf, sizeof buf); | |
893 | ||
894 | if (nbytes <= 0) | |
895 | { | |
896 | if (nbytes < 0 && errno != EWOULDBLOCK && errno != EAGAIN) | |
6099b3b5 | 897 | zlog_warn ("routing socket error: %s", safe_strerror (errno)); |
718e3744 | 898 | return 0; |
899 | } | |
900 | ||
9bcdb638 | 901 | thread_add_read (zebrad.master, kernel_read, NULL, sock); |
718e3744 | 902 | |
726f9b2b | 903 | if (IS_ZEBRA_DEBUG_KERNEL) |
904 | rtmsg_debug (&buf.r.rtm); | |
718e3744 | 905 | |
906 | rtm = &buf.r.rtm; | |
907 | ||
b27900b7 | 908 | /* |
909 | * Ensure that we didn't drop any data, so that processing routines | |
910 | * can assume they have the whole message. | |
911 | */ | |
da26e3b6 | 912 | if (rtm->rtm_msglen != nbytes) |
913 | { | |
914 | zlog_warn ("kernel_read: rtm->rtm_msglen %d, nbytes %d, type %d\n", | |
915 | rtm->rtm_msglen, nbytes, rtm->rtm_type); | |
916 | return -1; | |
917 | } | |
918 | ||
718e3744 | 919 | switch (rtm->rtm_type) |
920 | { | |
921 | case RTM_ADD: | |
922 | case RTM_DELETE: | |
923 | rtm_read (rtm); | |
924 | break; | |
925 | case RTM_IFINFO: | |
926 | ifm_read (&buf.im.ifm); | |
927 | break; | |
928 | case RTM_NEWADDR: | |
929 | case RTM_DELADDR: | |
930 | ifam_read (&buf.ia.ifa); | |
931 | break; | |
932 | #ifdef RTM_IFANNOUNCE | |
933 | case RTM_IFANNOUNCE: | |
934 | ifan_read (&buf.ian.ifan); | |
935 | break; | |
936 | #endif /* RTM_IFANNOUNCE */ | |
937 | default: | |
726f9b2b | 938 | if (IS_ZEBRA_DEBUG_KERNEL) |
b6178002 | 939 | zlog_debug("Unprocessed RTM_type: %d", rtm->rtm_type); |
718e3744 | 940 | break; |
941 | } | |
942 | return 0; | |
943 | } | |
944 | ||
945 | /* Make routing socket. */ | |
946 | void | |
947 | routing_socket () | |
948 | { | |
edd7c245 | 949 | if ( zserv_privs.change (ZPRIVS_RAISE) ) |
950 | zlog_err ("routing_socket: Can't raise privileges"); | |
951 | ||
718e3744 | 952 | routing_sock = socket (AF_ROUTE, SOCK_RAW, 0); |
953 | ||
954 | if (routing_sock < 0) | |
955 | { | |
edd7c245 | 956 | if ( zserv_privs.change (ZPRIVS_LOWER) ) |
957 | zlog_err ("routing_socket: Can't lower privileges"); | |
718e3744 | 958 | zlog_warn ("Can't init kernel routing socket"); |
959 | return; | |
960 | } | |
961 | ||
865b852c | 962 | /* XXX: Socket should be NONBLOCK, however as we currently |
963 | * discard failed writes, this will lead to inconsistencies. | |
964 | * For now, socket must be blocking. | |
965 | */ | |
966 | /*if (fcntl (routing_sock, F_SETFL, O_NONBLOCK) < 0) | |
967 | zlog_warn ("Can't set O_NONBLOCK to routing socket");*/ | |
968 | ||
edd7c245 | 969 | if ( zserv_privs.change (ZPRIVS_LOWER) ) |
970 | zlog_err ("routing_socket: Can't lower privileges"); | |
718e3744 | 971 | |
972 | /* kernel_read needs rewrite. */ | |
9bcdb638 | 973 | thread_add_read (zebrad.master, kernel_read, NULL, routing_sock); |
718e3744 | 974 | } |
975 | ||
976 | /* Exported interface function. This function simply calls | |
977 | routing_socket (). */ | |
978 | void | |
979 | kernel_init () | |
980 | { | |
981 | routing_socket (); | |
982 | } |