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718e3744 | 1 | /* Kernel routing table updates using netlink over GNU/Linux system. |
2 | * Copyright (C) 1997, 98, 99 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 | /* Hack for GNU libc version 2. */ | |
25 | #ifndef MSG_TRUNC | |
26 | #define MSG_TRUNC 0x20 | |
27 | #endif /* MSG_TRUNC */ | |
28 | ||
29 | #include "linklist.h" | |
30 | #include "if.h" | |
31 | #include "log.h" | |
32 | #include "prefix.h" | |
33 | #include "connected.h" | |
34 | #include "table.h" | |
35 | #include "rib.h" | |
e04ab74d | 36 | #include "thread.h" |
edd7c245 | 37 | #include "privs.h" |
718e3744 | 38 | |
39 | #include "zebra/zserv.h" | |
40 | #include "zebra/redistribute.h" | |
41 | #include "zebra/interface.h" | |
42 | #include "zebra/debug.h" | |
43 | ||
44 | /* Socket interface to kernel */ | |
45 | struct nlsock | |
46 | { | |
47 | int sock; | |
48 | int seq; | |
49 | struct sockaddr_nl snl; | |
fce954f8 | 50 | const char *name; |
7021c425 | 51 | } netlink = { -1, 0, {0}, "netlink-listen"}, /* kernel messages */ |
1ada8198 | 52 | netlink_cmd = { -1, 0, {0}, "netlink-cmd"}; /* command channel */ |
718e3744 | 53 | |
7021c425 | 54 | struct message nlmsg_str[] = { |
718e3744 | 55 | {RTM_NEWROUTE, "RTM_NEWROUTE"}, |
56 | {RTM_DELROUTE, "RTM_DELROUTE"}, | |
57 | {RTM_GETROUTE, "RTM_GETROUTE"}, | |
58 | {RTM_NEWLINK, "RTM_NEWLINK"}, | |
59 | {RTM_DELLINK, "RTM_DELLINK"}, | |
60 | {RTM_GETLINK, "RTM_GETLINK"}, | |
61 | {RTM_NEWADDR, "RTM_NEWADDR"}, | |
62 | {RTM_DELADDR, "RTM_DELADDR"}, | |
63 | {RTM_GETADDR, "RTM_GETADDR"}, | |
7021c425 | 64 | {0, NULL} |
65 | }; | |
66 | ||
fce954f8 | 67 | const char *nexthop_types_desc[] = |
7021c425 | 68 | { |
69 | "none", | |
70 | "Directly connected", | |
71 | "Interface route", | |
72 | "IPv4 nexthop", | |
73 | "IPv4 nexthop with ifindex", | |
74 | "IPv4 nexthop with ifname", | |
fa59980f | 75 | "IPv6 nexthop", |
7021c425 | 76 | "IPv6 nexthop with ifindex", |
77 | "IPv6 nexthop with ifname", | |
78 | "Null0 nexthop", | |
718e3744 | 79 | }; |
80 | ||
7021c425 | 81 | |
b21b19c5 | 82 | extern struct zebra_t zebrad; |
718e3744 | 83 | |
edd7c245 | 84 | extern struct zebra_privs_t zserv_privs; |
85 | ||
c34b6b57 | 86 | extern u_int32_t nl_rcvbufsize; |
87 | ||
d2fc8896 | 88 | /* Note: on netlink systems, there should be a 1-to-1 mapping between interface |
89 | names and ifindex values. */ | |
90 | static void | |
91 | set_ifindex(struct interface *ifp, unsigned int ifi_index) | |
92 | { | |
93 | struct interface *oifp; | |
94 | ||
95 | if (((oifp = if_lookup_by_index(ifi_index)) != NULL) && (oifp != ifp)) | |
96 | { | |
97 | if (ifi_index == IFINDEX_INTERNAL) | |
98 | zlog_err("Netlink is setting interface %s ifindex to reserved " | |
99 | "internal value %u", ifp->name, ifi_index); | |
100 | else | |
101 | { | |
102 | if (IS_ZEBRA_DEBUG_KERNEL) | |
103 | zlog_debug("interface index %d was renamed from %s to %s", | |
104 | ifi_index, oifp->name, ifp->name); | |
105 | if (if_is_up(oifp)) | |
106 | zlog_err("interface rename detected on up interface: index %d " | |
107 | "was renamed from %s to %s, results are uncertain!", | |
108 | ifi_index, oifp->name, ifp->name); | |
109 | if_delete_update(oifp); | |
110 | } | |
111 | } | |
112 | ifp->ifindex = ifi_index; | |
113 | } | |
114 | ||
718e3744 | 115 | /* Make socket for Linux netlink interface. */ |
116 | static int | |
117 | netlink_socket (struct nlsock *nl, unsigned long groups) | |
118 | { | |
119 | int ret; | |
120 | struct sockaddr_nl snl; | |
121 | int sock; | |
122 | int namelen; | |
4be019d5 | 123 | int save_errno; |
718e3744 | 124 | |
125 | sock = socket (AF_NETLINK, SOCK_RAW, NETLINK_ROUTE); | |
126 | if (sock < 0) | |
127 | { | |
128 | zlog (NULL, LOG_ERR, "Can't open %s socket: %s", nl->name, | |
6099b3b5 | 129 | safe_strerror (errno)); |
718e3744 | 130 | return -1; |
131 | } | |
132 | ||
133 | ret = fcntl (sock, F_SETFL, O_NONBLOCK); | |
134 | if (ret < 0) | |
135 | { | |
136 | zlog (NULL, LOG_ERR, "Can't set %s socket flags: %s", nl->name, | |
6099b3b5 | 137 | safe_strerror (errno)); |
718e3744 | 138 | close (sock); |
139 | return -1; | |
140 | } | |
7021c425 | 141 | |
c34b6b57 | 142 | /* Set receive buffer size if it's set from command line */ |
143 | if (nl_rcvbufsize) | |
144 | { | |
145 | u_int32_t oldsize, oldlen; | |
146 | u_int32_t newsize, newlen; | |
147 | ||
148 | oldlen = sizeof(oldsize); | |
149 | newlen = sizeof(newsize); | |
150 | ||
151 | ret = getsockopt(sock, SOL_SOCKET, SO_RCVBUF, &oldsize, &oldlen); | |
152 | if (ret < 0) | |
153 | { | |
154 | zlog (NULL, LOG_ERR, "Can't get %s receive buffer size: %s", nl->name, | |
6099b3b5 | 155 | safe_strerror (errno)); |
c34b6b57 | 156 | close (sock); |
157 | return -1; | |
158 | } | |
159 | ||
160 | ret = setsockopt(sock, SOL_SOCKET, SO_RCVBUF, &nl_rcvbufsize, | |
161 | sizeof(nl_rcvbufsize)); | |
162 | if (ret < 0) | |
163 | { | |
164 | zlog (NULL, LOG_ERR, "Can't set %s receive buffer size: %s", nl->name, | |
6099b3b5 | 165 | safe_strerror (errno)); |
c34b6b57 | 166 | close (sock); |
167 | return -1; | |
168 | } | |
169 | ||
170 | ret = getsockopt(sock, SOL_SOCKET, SO_RCVBUF, &newsize, &newlen); | |
171 | if (ret < 0) | |
172 | { | |
173 | zlog (NULL, LOG_ERR, "Can't get %s receive buffer size: %s", nl->name, | |
6099b3b5 | 174 | safe_strerror (errno)); |
c34b6b57 | 175 | close (sock); |
176 | return -1; | |
177 | } | |
178 | ||
179 | zlog (NULL, LOG_INFO, | |
180 | "Setting netlink socket receive buffer size: %u -> %u", | |
181 | oldsize, newsize); | |
182 | } | |
183 | ||
718e3744 | 184 | memset (&snl, 0, sizeof snl); |
185 | snl.nl_family = AF_NETLINK; | |
186 | snl.nl_groups = groups; | |
187 | ||
188 | /* Bind the socket to the netlink structure for anything. */ | |
7021c425 | 189 | if (zserv_privs.change (ZPRIVS_RAISE)) |
190 | { | |
191 | zlog (NULL, LOG_ERR, "Can't raise privileges"); | |
192 | return -1; | |
193 | } | |
edd7c245 | 194 | |
718e3744 | 195 | ret = bind (sock, (struct sockaddr *) &snl, sizeof snl); |
4be019d5 | 196 | save_errno = errno; |
55e7ecd1 | 197 | if (zserv_privs.change (ZPRIVS_LOWER)) |
198 | zlog (NULL, LOG_ERR, "Can't lower privileges"); | |
199 | ||
718e3744 | 200 | if (ret < 0) |
201 | { | |
7021c425 | 202 | zlog (NULL, LOG_ERR, "Can't bind %s socket to group 0x%x: %s", |
4be019d5 | 203 | nl->name, snl.nl_groups, safe_strerror (save_errno)); |
718e3744 | 204 | close (sock); |
205 | return -1; | |
206 | } | |
7021c425 | 207 | |
718e3744 | 208 | /* multiple netlink sockets will have different nl_pid */ |
209 | namelen = sizeof snl; | |
c9e52be3 | 210 | ret = getsockname (sock, (struct sockaddr *) &snl, (socklen_t *) &namelen); |
718e3744 | 211 | if (ret < 0 || namelen != sizeof snl) |
212 | { | |
213 | zlog (NULL, LOG_ERR, "Can't get %s socket name: %s", nl->name, | |
6099b3b5 | 214 | safe_strerror (errno)); |
718e3744 | 215 | close (sock); |
216 | return -1; | |
217 | } | |
218 | ||
219 | nl->snl = snl; | |
220 | nl->sock = sock; | |
221 | return ret; | |
222 | } | |
223 | ||
7021c425 | 224 | int |
225 | set_netlink_blocking (struct nlsock *nl, int *flags) | |
5f37d86f | 226 | { |
227 | ||
228 | /* Change socket flags for blocking I/O. */ | |
7021c425 | 229 | if ((*flags = fcntl (nl->sock, F_GETFL, 0)) < 0) |
5f37d86f | 230 | { |
7021c425 | 231 | zlog (NULL, LOG_ERR, "%s:%i F_GETFL error: %s", |
6099b3b5 | 232 | __FUNCTION__, __LINE__, safe_strerror (errno)); |
5f37d86f | 233 | return -1; |
234 | } | |
235 | *flags &= ~O_NONBLOCK; | |
7021c425 | 236 | if (fcntl (nl->sock, F_SETFL, *flags) < 0) |
5f37d86f | 237 | { |
7021c425 | 238 | zlog (NULL, LOG_ERR, "%s:%i F_SETFL error: %s", |
6099b3b5 | 239 | __FUNCTION__, __LINE__, safe_strerror (errno)); |
5f37d86f | 240 | return -1; |
241 | } | |
242 | return 0; | |
243 | } | |
244 | ||
7021c425 | 245 | int |
246 | set_netlink_nonblocking (struct nlsock *nl, int *flags) | |
247 | { | |
5f37d86f | 248 | /* Restore socket flags for nonblocking I/O */ |
249 | *flags |= O_NONBLOCK; | |
7021c425 | 250 | if (fcntl (nl->sock, F_SETFL, *flags) < 0) |
5f37d86f | 251 | { |
7021c425 | 252 | zlog (NULL, LOG_ERR, "%s:%i F_SETFL error: %s", |
6099b3b5 | 253 | __FUNCTION__, __LINE__, safe_strerror (errno)); |
5f37d86f | 254 | return -1; |
255 | } | |
256 | return 0; | |
257 | } | |
258 | ||
718e3744 | 259 | /* Get type specified information from netlink. */ |
260 | static int | |
261 | netlink_request (int family, int type, struct nlsock *nl) | |
262 | { | |
263 | int ret; | |
264 | struct sockaddr_nl snl; | |
4be019d5 | 265 | int save_errno; |
718e3744 | 266 | |
267 | struct | |
268 | { | |
269 | struct nlmsghdr nlh; | |
270 | struct rtgenmsg g; | |
271 | } req; | |
272 | ||
273 | ||
274 | /* Check netlink socket. */ | |
275 | if (nl->sock < 0) | |
276 | { | |
277 | zlog (NULL, LOG_ERR, "%s socket isn't active.", nl->name); | |
278 | return -1; | |
279 | } | |
280 | ||
281 | memset (&snl, 0, sizeof snl); | |
282 | snl.nl_family = AF_NETLINK; | |
283 | ||
c05612b9 | 284 | memset (&req, 0, sizeof req); |
718e3744 | 285 | req.nlh.nlmsg_len = sizeof req; |
286 | req.nlh.nlmsg_type = type; | |
287 | req.nlh.nlmsg_flags = NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST; | |
288 | req.nlh.nlmsg_pid = 0; | |
289 | req.nlh.nlmsg_seq = ++nl->seq; | |
290 | req.g.rtgen_family = family; | |
edd7c245 | 291 | |
292 | /* linux appears to check capabilities on every message | |
293 | * have to raise caps for every message sent | |
294 | */ | |
7021c425 | 295 | if (zserv_privs.change (ZPRIVS_RAISE)) |
edd7c245 | 296 | { |
297 | zlog (NULL, LOG_ERR, "Can't raise privileges"); | |
298 | return -1; | |
299 | } | |
7021c425 | 300 | |
301 | ret = sendto (nl->sock, (void *) &req, sizeof req, 0, | |
302 | (struct sockaddr *) &snl, sizeof snl); | |
4be019d5 | 303 | save_errno = errno; |
7021c425 | 304 | |
305 | if (zserv_privs.change (ZPRIVS_LOWER)) | |
306 | zlog (NULL, LOG_ERR, "Can't lower privileges"); | |
307 | ||
718e3744 | 308 | if (ret < 0) |
7021c425 | 309 | { |
310 | zlog (NULL, LOG_ERR, "%s sendto failed: %s", nl->name, | |
4be019d5 | 311 | safe_strerror (save_errno)); |
718e3744 | 312 | return -1; |
313 | } | |
edd7c245 | 314 | |
718e3744 | 315 | return 0; |
316 | } | |
317 | ||
318 | /* Receive message from netlink interface and pass those information | |
319 | to the given function. */ | |
320 | static int | |
321 | netlink_parse_info (int (*filter) (struct sockaddr_nl *, struct nlmsghdr *), | |
7021c425 | 322 | struct nlsock *nl) |
718e3744 | 323 | { |
324 | int status; | |
325 | int ret = 0; | |
326 | int error; | |
327 | ||
328 | while (1) | |
329 | { | |
330 | char buf[4096]; | |
331 | struct iovec iov = { buf, sizeof buf }; | |
332 | struct sockaddr_nl snl; | |
7021c425 | 333 | struct msghdr msg = { (void *) &snl, sizeof snl, &iov, 1, NULL, 0, 0 }; |
718e3744 | 334 | struct nlmsghdr *h; |
4be019d5 | 335 | int save_errno; |
718e3744 | 336 | |
7021c425 | 337 | if (zserv_privs.change (ZPRIVS_RAISE)) |
edd7c245 | 338 | zlog (NULL, LOG_ERR, "Can't raise privileges"); |
7021c425 | 339 | |
718e3744 | 340 | status = recvmsg (nl->sock, &msg, 0); |
4be019d5 | 341 | save_errno = errno; |
7021c425 | 342 | |
343 | if (zserv_privs.change (ZPRIVS_LOWER)) | |
edd7c245 | 344 | zlog (NULL, LOG_ERR, "Can't lower privileges"); |
718e3744 | 345 | |
346 | if (status < 0) | |
7021c425 | 347 | { |
4be019d5 | 348 | if (save_errno == EINTR) |
7021c425 | 349 | continue; |
4be019d5 | 350 | if (save_errno == EWOULDBLOCK || save_errno == EAGAIN) |
7021c425 | 351 | break; |
4be019d5 | 352 | zlog (NULL, LOG_ERR, "%s recvmsg overrun: %s", |
353 | nl->name, safe_strerror(save_errno)); | |
7021c425 | 354 | continue; |
355 | } | |
718e3744 | 356 | |
357 | if (status == 0) | |
7021c425 | 358 | { |
359 | zlog (NULL, LOG_ERR, "%s EOF", nl->name); | |
360 | return -1; | |
361 | } | |
718e3744 | 362 | |
363 | if (msg.msg_namelen != sizeof snl) | |
7021c425 | 364 | { |
365 | zlog (NULL, LOG_ERR, "%s sender address length error: length %d", | |
366 | nl->name, msg.msg_namelen); | |
367 | return -1; | |
368 | } | |
b84d3a1b | 369 | |
370 | /* JF: Ignore messages that aren't from the kernel */ | |
371 | if ( snl.nl_pid != 0 ) | |
372 | { | |
373 | zlog ( NULL, LOG_ERR, "Ignoring message from pid %u", snl.nl_pid ); | |
374 | continue; | |
375 | } | |
7021c425 | 376 | |
206d8055 | 377 | for (h = (struct nlmsghdr *) buf; NLMSG_OK (h, (unsigned int) status); |
7021c425 | 378 | h = NLMSG_NEXT (h, status)) |
379 | { | |
380 | /* Finish of reading. */ | |
381 | if (h->nlmsg_type == NLMSG_DONE) | |
382 | return ret; | |
383 | ||
384 | /* Error handling. */ | |
385 | if (h->nlmsg_type == NLMSG_ERROR) | |
386 | { | |
387 | struct nlmsgerr *err = (struct nlmsgerr *) NLMSG_DATA (h); | |
388 | ||
718e3744 | 389 | /* If the error field is zero, then this is an ACK */ |
7021c425 | 390 | if (err->error == 0) |
718e3744 | 391 | { |
7021c425 | 392 | if (IS_ZEBRA_DEBUG_KERNEL) |
393 | { | |
1ada8198 | 394 | zlog_debug ("%s: %s ACK: type=%s(%u), seq=%u, pid=%u", |
7021c425 | 395 | __FUNCTION__, nl->name, |
396 | lookup (nlmsg_str, err->msg.nlmsg_type), | |
397 | err->msg.nlmsg_type, err->msg.nlmsg_seq, | |
398 | err->msg.nlmsg_pid); | |
718e3744 | 399 | } |
7021c425 | 400 | |
401 | /* return if not a multipart message, otherwise continue */ | |
402 | if (!(h->nlmsg_flags & NLM_F_MULTI)) | |
403 | { | |
404 | return 0; | |
718e3744 | 405 | } |
7021c425 | 406 | continue; |
718e3744 | 407 | } |
7021c425 | 408 | |
718e3744 | 409 | if (h->nlmsg_len < NLMSG_LENGTH (sizeof (struct nlmsgerr))) |
7021c425 | 410 | { |
411 | zlog (NULL, LOG_ERR, "%s error: message truncated", | |
412 | nl->name); | |
413 | return -1; | |
414 | } | |
415 | ||
416 | /* Deal with Error Noise - MAG */ | |
417 | { | |
418 | int loglvl = LOG_ERR; | |
419 | int errnum = err->error; | |
420 | int msg_type = err->msg.nlmsg_type; | |
421 | ||
422 | if (nl == &netlink_cmd | |
423 | && (-errnum == ENODEV || -errnum == ESRCH) | |
424 | && (msg_type == RTM_NEWROUTE || msg_type == RTM_DELROUTE)) | |
425 | loglvl = LOG_DEBUG; | |
426 | ||
427 | zlog (NULL, loglvl, "%s error: %s, type=%s(%u), " | |
1ada8198 | 428 | "seq=%u, pid=%u", |
6099b3b5 | 429 | nl->name, safe_strerror (-errnum), |
7021c425 | 430 | lookup (nlmsg_str, msg_type), |
431 | msg_type, err->msg.nlmsg_seq, err->msg.nlmsg_pid); | |
432 | } | |
433 | /* | |
434 | ret = -1; | |
435 | continue; | |
436 | */ | |
437 | return -1; | |
438 | } | |
439 | ||
440 | /* OK we got netlink message. */ | |
441 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1ada8198 | 442 | zlog_debug ("netlink_parse_info: %s type %s(%u), seq=%u, pid=%u", |
7021c425 | 443 | nl->name, |
444 | lookup (nlmsg_str, h->nlmsg_type), h->nlmsg_type, | |
445 | h->nlmsg_seq, h->nlmsg_pid); | |
446 | ||
447 | /* skip unsolicited messages originating from command socket */ | |
448 | if (nl != &netlink_cmd && h->nlmsg_pid == netlink_cmd.snl.nl_pid) | |
449 | { | |
450 | if (IS_ZEBRA_DEBUG_KERNEL) | |
b6178002 | 451 | zlog_debug ("netlink_parse_info: %s packet comes from %s", |
1ada8198 | 452 | netlink_cmd.name, nl->name); |
7021c425 | 453 | continue; |
454 | } | |
455 | ||
456 | error = (*filter) (&snl, h); | |
457 | if (error < 0) | |
458 | { | |
459 | zlog (NULL, LOG_ERR, "%s filter function error", nl->name); | |
460 | ret = error; | |
461 | } | |
462 | } | |
718e3744 | 463 | |
464 | /* After error care. */ | |
465 | if (msg.msg_flags & MSG_TRUNC) | |
7021c425 | 466 | { |
467 | zlog (NULL, LOG_ERR, "%s error: message truncated", nl->name); | |
468 | continue; | |
469 | } | |
718e3744 | 470 | if (status) |
7021c425 | 471 | { |
472 | zlog (NULL, LOG_ERR, "%s error: data remnant size %d", nl->name, | |
473 | status); | |
474 | return -1; | |
475 | } | |
718e3744 | 476 | } |
477 | return ret; | |
478 | } | |
479 | ||
480 | /* Utility function for parse rtattr. */ | |
481 | static void | |
7021c425 | 482 | netlink_parse_rtattr (struct rtattr **tb, int max, struct rtattr *rta, |
483 | int len) | |
718e3744 | 484 | { |
7021c425 | 485 | while (RTA_OK (rta, len)) |
718e3744 | 486 | { |
487 | if (rta->rta_type <= max) | |
7021c425 | 488 | tb[rta->rta_type] = rta; |
489 | rta = RTA_NEXT (rta, len); | |
718e3744 | 490 | } |
491 | } | |
492 | ||
493 | /* Called from interface_lookup_netlink(). This function is only used | |
494 | during bootstrap. */ | |
495 | int | |
496 | netlink_interface (struct sockaddr_nl *snl, struct nlmsghdr *h) | |
497 | { | |
498 | int len; | |
499 | struct ifinfomsg *ifi; | |
500 | struct rtattr *tb[IFLA_MAX + 1]; | |
501 | struct interface *ifp; | |
502 | char *name; | |
503 | int i; | |
504 | ||
505 | ifi = NLMSG_DATA (h); | |
506 | ||
507 | if (h->nlmsg_type != RTM_NEWLINK) | |
508 | return 0; | |
509 | ||
510 | len = h->nlmsg_len - NLMSG_LENGTH (sizeof (struct ifinfomsg)); | |
511 | if (len < 0) | |
512 | return -1; | |
513 | ||
514 | /* Looking up interface name. */ | |
515 | memset (tb, 0, sizeof tb); | |
516 | netlink_parse_rtattr (tb, IFLA_MAX, IFLA_RTA (ifi), len); | |
c15cb242 | 517 | |
1e193152 | 518 | #ifdef IFLA_WIRELESS |
c15cb242 | 519 | /* check for wireless messages to ignore */ |
520 | if ((tb[IFLA_WIRELESS] != NULL) && (ifi->ifi_change == 0)) | |
521 | { | |
522 | if (IS_ZEBRA_DEBUG_KERNEL) | |
523 | zlog_debug ("%s: ignoring IFLA_WIRELESS message", __func__); | |
524 | return 0; | |
525 | } | |
1e193152 | 526 | #endif /* IFLA_WIRELESS */ |
c15cb242 | 527 | |
718e3744 | 528 | if (tb[IFLA_IFNAME] == NULL) |
529 | return -1; | |
7021c425 | 530 | name = (char *) RTA_DATA (tb[IFLA_IFNAME]); |
718e3744 | 531 | |
532 | /* Add interface. */ | |
533 | ifp = if_get_by_name (name); | |
d2fc8896 | 534 | set_ifindex(ifp, ifi->ifi_index); |
718e3744 | 535 | ifp->flags = ifi->ifi_flags & 0x0000fffff; |
44145db3 | 536 | ifp->mtu6 = ifp->mtu = *(int *) RTA_DATA (tb[IFLA_MTU]); |
718e3744 | 537 | ifp->metric = 1; |
538 | ||
539 | /* Hardware type and address. */ | |
540 | ifp->hw_type = ifi->ifi_type; | |
541 | ||
542 | if (tb[IFLA_ADDRESS]) | |
543 | { | |
544 | int hw_addr_len; | |
545 | ||
7021c425 | 546 | hw_addr_len = RTA_PAYLOAD (tb[IFLA_ADDRESS]); |
718e3744 | 547 | |
548 | if (hw_addr_len > INTERFACE_HWADDR_MAX) | |
7021c425 | 549 | zlog_warn ("Hardware address is too large: %d", hw_addr_len); |
718e3744 | 550 | else |
7021c425 | 551 | { |
552 | ifp->hw_addr_len = hw_addr_len; | |
553 | memcpy (ifp->hw_addr, RTA_DATA (tb[IFLA_ADDRESS]), hw_addr_len); | |
554 | ||
555 | for (i = 0; i < hw_addr_len; i++) | |
556 | if (ifp->hw_addr[i] != 0) | |
557 | break; | |
558 | ||
559 | if (i == hw_addr_len) | |
560 | ifp->hw_addr_len = 0; | |
561 | else | |
562 | ifp->hw_addr_len = hw_addr_len; | |
563 | } | |
718e3744 | 564 | } |
565 | ||
566 | if_add_update (ifp); | |
567 | ||
568 | return 0; | |
569 | } | |
570 | ||
571 | /* Lookup interface IPv4/IPv6 address. */ | |
572 | int | |
573 | netlink_interface_addr (struct sockaddr_nl *snl, struct nlmsghdr *h) | |
574 | { | |
575 | int len; | |
576 | struct ifaddrmsg *ifa; | |
7021c425 | 577 | struct rtattr *tb[IFA_MAX + 1]; |
718e3744 | 578 | struct interface *ifp; |
579 | void *addr = NULL; | |
580 | void *broad = NULL; | |
581 | u_char flags = 0; | |
582 | char *label = NULL; | |
583 | ||
584 | ifa = NLMSG_DATA (h); | |
585 | ||
7021c425 | 586 | if (ifa->ifa_family != AF_INET |
718e3744 | 587 | #ifdef HAVE_IPV6 |
588 | && ifa->ifa_family != AF_INET6 | |
589 | #endif /* HAVE_IPV6 */ | |
7021c425 | 590 | ) |
718e3744 | 591 | return 0; |
592 | ||
593 | if (h->nlmsg_type != RTM_NEWADDR && h->nlmsg_type != RTM_DELADDR) | |
594 | return 0; | |
595 | ||
7021c425 | 596 | len = h->nlmsg_len - NLMSG_LENGTH (sizeof (struct ifaddrmsg)); |
718e3744 | 597 | if (len < 0) |
598 | return -1; | |
599 | ||
600 | memset (tb, 0, sizeof tb); | |
601 | netlink_parse_rtattr (tb, IFA_MAX, IFA_RTA (ifa), len); | |
602 | ||
603 | ifp = if_lookup_by_index (ifa->ifa_index); | |
604 | if (ifp == NULL) | |
605 | { | |
606 | zlog_err ("netlink_interface_addr can't find interface by index %d", | |
7021c425 | 607 | ifa->ifa_index); |
718e3744 | 608 | return -1; |
609 | } | |
610 | ||
7021c425 | 611 | if (IS_ZEBRA_DEBUG_KERNEL) /* remove this line to see initial ifcfg */ |
718e3744 | 612 | { |
00df0c1e | 613 | char buf[BUFSIZ]; |
206d8055 | 614 | zlog_debug ("netlink_interface_addr %s %s:", |
615 | lookup (nlmsg_str, h->nlmsg_type), ifp->name); | |
718e3744 | 616 | if (tb[IFA_LOCAL]) |
206d8055 | 617 | zlog_debug (" IFA_LOCAL %s/%d", |
618 | inet_ntop (ifa->ifa_family, RTA_DATA (tb[IFA_LOCAL]), | |
619 | buf, BUFSIZ), ifa->ifa_prefixlen); | |
718e3744 | 620 | if (tb[IFA_ADDRESS]) |
206d8055 | 621 | zlog_debug (" IFA_ADDRESS %s/%d", |
622 | inet_ntop (ifa->ifa_family, RTA_DATA (tb[IFA_ADDRESS]), | |
623 | buf, BUFSIZ), ifa->ifa_prefixlen); | |
718e3744 | 624 | if (tb[IFA_BROADCAST]) |
206d8055 | 625 | zlog_debug (" IFA_BROADCAST %s/%d", |
626 | inet_ntop (ifa->ifa_family, RTA_DATA (tb[IFA_BROADCAST]), | |
627 | buf, BUFSIZ), ifa->ifa_prefixlen); | |
00df0c1e | 628 | if (tb[IFA_LABEL] && strcmp (ifp->name, RTA_DATA (tb[IFA_LABEL]))) |
b6178002 | 629 | zlog_debug (" IFA_LABEL %s", (char *)RTA_DATA (tb[IFA_LABEL])); |
718e3744 | 630 | } |
31a476c7 | 631 | |
632 | if (tb[IFA_ADDRESS] == NULL) | |
633 | tb[IFA_ADDRESS] = tb[IFA_LOCAL]; | |
634 | ||
635 | if (ifp->flags & IFF_POINTOPOINT) | |
7021c425 | 636 | { |
31a476c7 | 637 | if (tb[IFA_LOCAL]) |
638 | { | |
639 | addr = RTA_DATA (tb[IFA_LOCAL]); | |
3fb9cd6e | 640 | if (tb[IFA_ADDRESS] && |
641 | memcmp(RTA_DATA(tb[IFA_ADDRESS]),RTA_DATA(tb[IFA_LOCAL]),4)) | |
642 | /* if IFA_ADDRESS != IFA_LOCAL, then it's the peer address */ | |
31a476c7 | 643 | broad = RTA_DATA (tb[IFA_ADDRESS]); |
644 | else | |
645 | broad = NULL; | |
646 | } | |
647 | else | |
648 | { | |
649 | if (tb[IFA_ADDRESS]) | |
650 | addr = RTA_DATA (tb[IFA_ADDRESS]); | |
651 | else | |
652 | addr = NULL; | |
653 | } | |
7021c425 | 654 | } |
31a476c7 | 655 | else |
7021c425 | 656 | { |
31a476c7 | 657 | if (tb[IFA_ADDRESS]) |
658 | addr = RTA_DATA (tb[IFA_ADDRESS]); | |
659 | else | |
660 | addr = NULL; | |
661 | ||
662 | if (tb[IFA_BROADCAST]) | |
663 | broad = RTA_DATA(tb[IFA_BROADCAST]); | |
664 | else | |
665 | broad = NULL; | |
7021c425 | 666 | } |
00df0c1e | 667 | |
718e3744 | 668 | /* Flags. */ |
669 | if (ifa->ifa_flags & IFA_F_SECONDARY) | |
670 | SET_FLAG (flags, ZEBRA_IFA_SECONDARY); | |
671 | ||
672 | /* Label */ | |
673 | if (tb[IFA_LABEL]) | |
674 | label = (char *) RTA_DATA (tb[IFA_LABEL]); | |
675 | ||
676 | if (ifp && label && strcmp (ifp->name, label) == 0) | |
677 | label = NULL; | |
678 | ||
679 | /* Register interface address to the interface. */ | |
680 | if (ifa->ifa_family == AF_INET) | |
681 | { | |
7021c425 | 682 | if (h->nlmsg_type == RTM_NEWADDR) |
683 | connected_add_ipv4 (ifp, flags, | |
684 | (struct in_addr *) addr, ifa->ifa_prefixlen, | |
685 | (struct in_addr *) broad, label); | |
686 | else | |
687 | connected_delete_ipv4 (ifp, flags, | |
688 | (struct in_addr *) addr, ifa->ifa_prefixlen, | |
0752ef0b | 689 | (struct in_addr *) broad); |
718e3744 | 690 | } |
691 | #ifdef HAVE_IPV6 | |
692 | if (ifa->ifa_family == AF_INET6) | |
693 | { | |
694 | if (h->nlmsg_type == RTM_NEWADDR) | |
7021c425 | 695 | connected_add_ipv6 (ifp, |
696 | (struct in6_addr *) addr, ifa->ifa_prefixlen, | |
0752ef0b | 697 | (struct in6_addr *) broad, label); |
718e3744 | 698 | else |
7021c425 | 699 | connected_delete_ipv6 (ifp, |
700 | (struct in6_addr *) addr, ifa->ifa_prefixlen, | |
701 | (struct in6_addr *) broad); | |
718e3744 | 702 | } |
7021c425 | 703 | #endif /* HAVE_IPV6 */ |
718e3744 | 704 | |
705 | return 0; | |
706 | } | |
707 | ||
708 | /* Looking up routing table by netlink interface. */ | |
709 | int | |
710 | netlink_routing_table (struct sockaddr_nl *snl, struct nlmsghdr *h) | |
711 | { | |
712 | int len; | |
713 | struct rtmsg *rtm; | |
7021c425 | 714 | struct rtattr *tb[RTA_MAX + 1]; |
718e3744 | 715 | u_char flags = 0; |
7021c425 | 716 | |
717 | char anyaddr[16] = { 0 }; | |
718e3744 | 718 | |
719 | int index; | |
720 | int table; | |
34195bf6 | 721 | int metric; |
722 | ||
718e3744 | 723 | void *dest; |
724 | void *gate; | |
725 | ||
726 | rtm = NLMSG_DATA (h); | |
727 | ||
728 | if (h->nlmsg_type != RTM_NEWROUTE) | |
729 | return 0; | |
730 | if (rtm->rtm_type != RTN_UNICAST) | |
731 | return 0; | |
732 | ||
733 | table = rtm->rtm_table; | |
7021c425 | 734 | #if 0 /* we weed them out later in rib_weed_tables () */ |
b21b19c5 | 735 | if (table != RT_TABLE_MAIN && table != zebrad.rtm_table_default) |
718e3744 | 736 | return 0; |
737 | #endif | |
738 | ||
7021c425 | 739 | len = h->nlmsg_len - NLMSG_LENGTH (sizeof (struct rtmsg)); |
718e3744 | 740 | if (len < 0) |
741 | return -1; | |
742 | ||
743 | memset (tb, 0, sizeof tb); | |
744 | netlink_parse_rtattr (tb, RTA_MAX, RTM_RTA (rtm), len); | |
745 | ||
746 | if (rtm->rtm_flags & RTM_F_CLONED) | |
747 | return 0; | |
748 | if (rtm->rtm_protocol == RTPROT_REDIRECT) | |
749 | return 0; | |
750 | if (rtm->rtm_protocol == RTPROT_KERNEL) | |
751 | return 0; | |
752 | ||
753 | if (rtm->rtm_src_len != 0) | |
754 | return 0; | |
755 | ||
756 | /* Route which inserted by Zebra. */ | |
757 | if (rtm->rtm_protocol == RTPROT_ZEBRA) | |
758 | flags |= ZEBRA_FLAG_SELFROUTE; | |
7021c425 | 759 | |
718e3744 | 760 | index = 0; |
34195bf6 | 761 | metric = 0; |
718e3744 | 762 | dest = NULL; |
763 | gate = NULL; | |
764 | ||
765 | if (tb[RTA_OIF]) | |
766 | index = *(int *) RTA_DATA (tb[RTA_OIF]); | |
767 | ||
768 | if (tb[RTA_DST]) | |
769 | dest = RTA_DATA (tb[RTA_DST]); | |
770 | else | |
771 | dest = anyaddr; | |
772 | ||
773 | /* Multipath treatment is needed. */ | |
774 | if (tb[RTA_GATEWAY]) | |
775 | gate = RTA_DATA (tb[RTA_GATEWAY]); | |
776 | ||
34195bf6 | 777 | if (tb[RTA_PRIORITY]) |
778 | metric = *(int *) RTA_DATA(tb[RTA_PRIORITY]); | |
779 | ||
718e3744 | 780 | if (rtm->rtm_family == AF_INET) |
781 | { | |
782 | struct prefix_ipv4 p; | |
783 | p.family = AF_INET; | |
784 | memcpy (&p.prefix, dest, 4); | |
785 | p.prefixlen = rtm->rtm_dst_len; | |
786 | ||
34195bf6 | 787 | rib_add_ipv4 (ZEBRA_ROUTE_KERNEL, flags, &p, gate, index, table, metric, 0); |
718e3744 | 788 | } |
789 | #ifdef HAVE_IPV6 | |
790 | if (rtm->rtm_family == AF_INET6) | |
791 | { | |
792 | struct prefix_ipv6 p; | |
793 | p.family = AF_INET6; | |
794 | memcpy (&p.prefix, dest, 16); | |
795 | p.prefixlen = rtm->rtm_dst_len; | |
796 | ||
be61c4eb | 797 | rib_add_ipv6 (ZEBRA_ROUTE_KERNEL, flags, &p, gate, index, table, |
798 | metric, 0); | |
718e3744 | 799 | } |
800 | #endif /* HAVE_IPV6 */ | |
801 | ||
802 | return 0; | |
803 | } | |
804 | ||
7021c425 | 805 | struct message rtproto_str[] = { |
718e3744 | 806 | {RTPROT_REDIRECT, "redirect"}, |
807 | {RTPROT_KERNEL, "kernel"}, | |
808 | {RTPROT_BOOT, "boot"}, | |
809 | {RTPROT_STATIC, "static"}, | |
810 | {RTPROT_GATED, "GateD"}, | |
811 | {RTPROT_RA, "router advertisement"}, | |
812 | {RTPROT_MRT, "MRT"}, | |
813 | {RTPROT_ZEBRA, "Zebra"}, | |
814 | #ifdef RTPROT_BIRD | |
815 | {RTPROT_BIRD, "BIRD"}, | |
816 | #endif /* RTPROT_BIRD */ | |
817 | {0, NULL} | |
818 | }; | |
819 | ||
820 | /* Routing information change from the kernel. */ | |
821 | int | |
822 | netlink_route_change (struct sockaddr_nl *snl, struct nlmsghdr *h) | |
823 | { | |
824 | int len; | |
825 | struct rtmsg *rtm; | |
7021c425 | 826 | struct rtattr *tb[RTA_MAX + 1]; |
827 | ||
828 | char anyaddr[16] = { 0 }; | |
718e3744 | 829 | |
830 | int index; | |
831 | int table; | |
832 | void *dest; | |
833 | void *gate; | |
834 | ||
835 | rtm = NLMSG_DATA (h); | |
836 | ||
7021c425 | 837 | if (!(h->nlmsg_type == RTM_NEWROUTE || h->nlmsg_type == RTM_DELROUTE)) |
718e3744 | 838 | { |
839 | /* If this is not route add/delete message print warning. */ | |
840 | zlog_warn ("Kernel message: %d\n", h->nlmsg_type); | |
841 | return 0; | |
842 | } | |
843 | ||
844 | /* Connected route. */ | |
845 | if (IS_ZEBRA_DEBUG_KERNEL) | |
b6178002 | 846 | zlog_debug ("%s %s %s proto %s", |
7021c425 | 847 | h->nlmsg_type == |
848 | RTM_NEWROUTE ? "RTM_NEWROUTE" : "RTM_DELROUTE", | |
849 | rtm->rtm_family == AF_INET ? "ipv4" : "ipv6", | |
850 | rtm->rtm_type == RTN_UNICAST ? "unicast" : "multicast", | |
851 | lookup (rtproto_str, rtm->rtm_protocol)); | |
718e3744 | 852 | |
853 | if (rtm->rtm_type != RTN_UNICAST) | |
854 | { | |
855 | return 0; | |
856 | } | |
857 | ||
858 | table = rtm->rtm_table; | |
b21b19c5 | 859 | if (table != RT_TABLE_MAIN && table != zebrad.rtm_table_default) |
718e3744 | 860 | { |
861 | return 0; | |
862 | } | |
863 | ||
7021c425 | 864 | len = h->nlmsg_len - NLMSG_LENGTH (sizeof (struct rtmsg)); |
718e3744 | 865 | if (len < 0) |
866 | return -1; | |
867 | ||
868 | memset (tb, 0, sizeof tb); | |
869 | netlink_parse_rtattr (tb, RTA_MAX, RTM_RTA (rtm), len); | |
870 | ||
871 | if (rtm->rtm_flags & RTM_F_CLONED) | |
872 | return 0; | |
873 | if (rtm->rtm_protocol == RTPROT_REDIRECT) | |
874 | return 0; | |
875 | if (rtm->rtm_protocol == RTPROT_KERNEL) | |
876 | return 0; | |
877 | ||
878 | if (rtm->rtm_protocol == RTPROT_ZEBRA && h->nlmsg_type == RTM_NEWROUTE) | |
879 | return 0; | |
880 | ||
881 | if (rtm->rtm_src_len != 0) | |
882 | { | |
883 | zlog_warn ("netlink_route_change(): no src len"); | |
884 | return 0; | |
885 | } | |
7021c425 | 886 | |
718e3744 | 887 | index = 0; |
888 | dest = NULL; | |
889 | gate = NULL; | |
890 | ||
891 | if (tb[RTA_OIF]) | |
892 | index = *(int *) RTA_DATA (tb[RTA_OIF]); | |
893 | ||
894 | if (tb[RTA_DST]) | |
895 | dest = RTA_DATA (tb[RTA_DST]); | |
896 | else | |
897 | dest = anyaddr; | |
898 | ||
899 | if (tb[RTA_GATEWAY]) | |
900 | gate = RTA_DATA (tb[RTA_GATEWAY]); | |
901 | ||
902 | if (rtm->rtm_family == AF_INET) | |
903 | { | |
904 | struct prefix_ipv4 p; | |
905 | p.family = AF_INET; | |
906 | memcpy (&p.prefix, dest, 4); | |
907 | p.prefixlen = rtm->rtm_dst_len; | |
908 | ||
909 | if (IS_ZEBRA_DEBUG_KERNEL) | |
7021c425 | 910 | { |
911 | if (h->nlmsg_type == RTM_NEWROUTE) | |
b6178002 | 912 | zlog_debug ("RTM_NEWROUTE %s/%d", |
7021c425 | 913 | inet_ntoa (p.prefix), p.prefixlen); |
914 | else | |
b6178002 | 915 | zlog_debug ("RTM_DELROUTE %s/%d", |
7021c425 | 916 | inet_ntoa (p.prefix), p.prefixlen); |
917 | } | |
718e3744 | 918 | |
919 | if (h->nlmsg_type == RTM_NEWROUTE) | |
7021c425 | 920 | rib_add_ipv4 (ZEBRA_ROUTE_KERNEL, 0, &p, gate, index, table, 0, 0); |
718e3744 | 921 | else |
7021c425 | 922 | rib_delete_ipv4 (ZEBRA_ROUTE_KERNEL, 0, &p, gate, index, table); |
718e3744 | 923 | } |
924 | ||
925 | #ifdef HAVE_IPV6 | |
926 | if (rtm->rtm_family == AF_INET6) | |
927 | { | |
928 | struct prefix_ipv6 p; | |
929 | char buf[BUFSIZ]; | |
930 | ||
931 | p.family = AF_INET6; | |
932 | memcpy (&p.prefix, dest, 16); | |
933 | p.prefixlen = rtm->rtm_dst_len; | |
934 | ||
935 | if (IS_ZEBRA_DEBUG_KERNEL) | |
7021c425 | 936 | { |
937 | if (h->nlmsg_type == RTM_NEWROUTE) | |
b6178002 | 938 | zlog_debug ("RTM_NEWROUTE %s/%d", |
7021c425 | 939 | inet_ntop (AF_INET6, &p.prefix, buf, BUFSIZ), |
940 | p.prefixlen); | |
941 | else | |
b6178002 | 942 | zlog_debug ("RTM_DELROUTE %s/%d", |
7021c425 | 943 | inet_ntop (AF_INET6, &p.prefix, buf, BUFSIZ), |
944 | p.prefixlen); | |
945 | } | |
718e3744 | 946 | |
947 | if (h->nlmsg_type == RTM_NEWROUTE) | |
be61c4eb | 948 | rib_add_ipv6 (ZEBRA_ROUTE_KERNEL, 0, &p, gate, index, 0, 0, 0); |
718e3744 | 949 | else |
7021c425 | 950 | rib_delete_ipv6 (ZEBRA_ROUTE_KERNEL, 0, &p, gate, index, 0); |
718e3744 | 951 | } |
952 | #endif /* HAVE_IPV6 */ | |
953 | ||
954 | return 0; | |
955 | } | |
956 | ||
957 | int | |
958 | netlink_link_change (struct sockaddr_nl *snl, struct nlmsghdr *h) | |
959 | { | |
960 | int len; | |
961 | struct ifinfomsg *ifi; | |
7021c425 | 962 | struct rtattr *tb[IFLA_MAX + 1]; |
718e3744 | 963 | struct interface *ifp; |
964 | char *name; | |
965 | ||
966 | ifi = NLMSG_DATA (h); | |
967 | ||
7021c425 | 968 | if (!(h->nlmsg_type == RTM_NEWLINK || h->nlmsg_type == RTM_DELLINK)) |
718e3744 | 969 | { |
970 | /* If this is not link add/delete message so print warning. */ | |
971 | zlog_warn ("netlink_link_change: wrong kernel message %d\n", | |
7021c425 | 972 | h->nlmsg_type); |
718e3744 | 973 | return 0; |
974 | } | |
975 | ||
976 | len = h->nlmsg_len - NLMSG_LENGTH (sizeof (struct ifinfomsg)); | |
977 | if (len < 0) | |
978 | return -1; | |
979 | ||
980 | /* Looking up interface name. */ | |
981 | memset (tb, 0, sizeof tb); | |
982 | netlink_parse_rtattr (tb, IFLA_MAX, IFLA_RTA (ifi), len); | |
c15cb242 | 983 | |
1e193152 | 984 | #ifdef IFLA_WIRELESS |
c15cb242 | 985 | /* check for wireless messages to ignore */ |
986 | if ((tb[IFLA_WIRELESS] != NULL) && (ifi->ifi_change == 0)) | |
987 | { | |
988 | if (IS_ZEBRA_DEBUG_KERNEL) | |
989 | zlog_debug ("%s: ignoring IFLA_WIRELESS message", __func__); | |
990 | return 0; | |
991 | } | |
1e193152 | 992 | #endif /* IFLA_WIRELESS */ |
c15cb242 | 993 | |
718e3744 | 994 | if (tb[IFLA_IFNAME] == NULL) |
995 | return -1; | |
7021c425 | 996 | name = (char *) RTA_DATA (tb[IFLA_IFNAME]); |
718e3744 | 997 | |
998 | /* Add interface. */ | |
999 | if (h->nlmsg_type == RTM_NEWLINK) | |
1000 | { | |
1001 | ifp = if_lookup_by_name (name); | |
1002 | ||
7021c425 | 1003 | if (ifp == NULL || !CHECK_FLAG (ifp->status, ZEBRA_INTERFACE_ACTIVE)) |
1004 | { | |
1005 | if (ifp == NULL) | |
1006 | ifp = if_get_by_name (name); | |
718e3744 | 1007 | |
d2fc8896 | 1008 | set_ifindex(ifp, ifi->ifi_index); |
7021c425 | 1009 | ifp->flags = ifi->ifi_flags & 0x0000fffff; |
44145db3 | 1010 | ifp->mtu6 = ifp->mtu = *(int *) RTA_DATA (tb[IFLA_MTU]); |
7021c425 | 1011 | ifp->metric = 1; |
718e3744 | 1012 | |
7021c425 | 1013 | /* If new link is added. */ |
1014 | if_add_update (ifp); | |
1015 | } | |
718e3744 | 1016 | else |
7021c425 | 1017 | { |
1018 | /* Interface status change. */ | |
d2fc8896 | 1019 | set_ifindex(ifp, ifi->ifi_index); |
44145db3 | 1020 | ifp->mtu6 = ifp->mtu = *(int *) RTA_DATA (tb[IFLA_MTU]); |
7021c425 | 1021 | ifp->metric = 1; |
1022 | ||
1023 | if (if_is_operative (ifp)) | |
1024 | { | |
1025 | ifp->flags = ifi->ifi_flags & 0x0000fffff; | |
1026 | if (!if_is_operative (ifp)) | |
1027 | if_down (ifp); | |
a608bbf2 | 1028 | else |
1029 | /* Must notify client daemons of new interface status. */ | |
1030 | zebra_interface_up_update (ifp); | |
7021c425 | 1031 | } |
1032 | else | |
1033 | { | |
1034 | ifp->flags = ifi->ifi_flags & 0x0000fffff; | |
1035 | if (if_is_operative (ifp)) | |
1036 | if_up (ifp); | |
1037 | } | |
1038 | } | |
718e3744 | 1039 | } |
1040 | else | |
1041 | { | |
1042 | /* RTM_DELLINK. */ | |
1043 | ifp = if_lookup_by_name (name); | |
1044 | ||
1045 | if (ifp == NULL) | |
7021c425 | 1046 | { |
1047 | zlog (NULL, LOG_WARNING, "interface %s is deleted but can't find", | |
718e3744 | 1048 | name); |
7021c425 | 1049 | return 0; |
1050 | } | |
1051 | ||
718e3744 | 1052 | if_delete_update (ifp); |
1053 | } | |
1054 | ||
1055 | return 0; | |
1056 | } | |
1057 | ||
1058 | int | |
1059 | netlink_information_fetch (struct sockaddr_nl *snl, struct nlmsghdr *h) | |
1060 | { | |
1061 | switch (h->nlmsg_type) | |
1062 | { | |
1063 | case RTM_NEWROUTE: | |
1064 | return netlink_route_change (snl, h); | |
1065 | break; | |
1066 | case RTM_DELROUTE: | |
1067 | return netlink_route_change (snl, h); | |
1068 | break; | |
1069 | case RTM_NEWLINK: | |
1070 | return netlink_link_change (snl, h); | |
1071 | break; | |
1072 | case RTM_DELLINK: | |
1073 | return netlink_link_change (snl, h); | |
1074 | break; | |
1075 | case RTM_NEWADDR: | |
1076 | return netlink_interface_addr (snl, h); | |
1077 | break; | |
1078 | case RTM_DELADDR: | |
1079 | return netlink_interface_addr (snl, h); | |
1080 | break; | |
1081 | default: | |
1082 | zlog_warn ("Unknown netlink nlmsg_type %d\n", h->nlmsg_type); | |
1083 | break; | |
1084 | } | |
1085 | return 0; | |
1086 | } | |
1087 | ||
1088 | /* Interface lookup by netlink socket. */ | |
1089 | int | |
1090 | interface_lookup_netlink () | |
1091 | { | |
1092 | int ret; | |
5f37d86f | 1093 | int flags; |
1094 | int snb_ret; | |
7021c425 | 1095 | |
5f37d86f | 1096 | /* |
1097 | * Change netlink socket flags to blocking to ensure we get | |
1098 | * a reply via nelink_parse_info | |
7021c425 | 1099 | */ |
1100 | snb_ret = set_netlink_blocking (&netlink_cmd, &flags); | |
1101 | if (snb_ret < 0) | |
1102 | zlog (NULL, LOG_WARNING, | |
1103 | "%s:%i Warning: Could not set netlink socket to blocking.", | |
1104 | __FUNCTION__, __LINE__); | |
1105 | ||
718e3744 | 1106 | /* Get interface information. */ |
1107 | ret = netlink_request (AF_PACKET, RTM_GETLINK, &netlink_cmd); | |
1108 | if (ret < 0) | |
1109 | return ret; | |
1110 | ret = netlink_parse_info (netlink_interface, &netlink_cmd); | |
1111 | if (ret < 0) | |
1112 | return ret; | |
1113 | ||
1114 | /* Get IPv4 address of the interfaces. */ | |
1115 | ret = netlink_request (AF_INET, RTM_GETADDR, &netlink_cmd); | |
1116 | if (ret < 0) | |
1117 | return ret; | |
1118 | ret = netlink_parse_info (netlink_interface_addr, &netlink_cmd); | |
1119 | if (ret < 0) | |
1120 | return ret; | |
1121 | ||
1122 | #ifdef HAVE_IPV6 | |
1123 | /* Get IPv6 address of the interfaces. */ | |
1124 | ret = netlink_request (AF_INET6, RTM_GETADDR, &netlink_cmd); | |
1125 | if (ret < 0) | |
1126 | return ret; | |
1127 | ret = netlink_parse_info (netlink_interface_addr, &netlink_cmd); | |
1128 | if (ret < 0) | |
1129 | return ret; | |
1130 | #endif /* HAVE_IPV6 */ | |
1131 | ||
7021c425 | 1132 | /* restore socket flags */ |
1133 | if (snb_ret == 0) | |
1134 | set_netlink_nonblocking (&netlink_cmd, &flags); | |
718e3744 | 1135 | return 0; |
1136 | } | |
1137 | ||
1138 | /* Routing table read function using netlink interface. Only called | |
1139 | bootstrap time. */ | |
1140 | int | |
1141 | netlink_route_read () | |
1142 | { | |
1143 | int ret; | |
5f37d86f | 1144 | int flags; |
1145 | int snb_ret; | |
7021c425 | 1146 | |
5f37d86f | 1147 | /* |
1148 | * Change netlink socket flags to blocking to ensure we get | |
1149 | * a reply via nelink_parse_info | |
7021c425 | 1150 | */ |
1151 | snb_ret = set_netlink_blocking (&netlink_cmd, &flags); | |
1152 | if (snb_ret < 0) | |
1153 | zlog (NULL, LOG_WARNING, | |
1154 | "%s:%i Warning: Could not set netlink socket to blocking.", | |
1155 | __FUNCTION__, __LINE__); | |
1156 | ||
718e3744 | 1157 | /* Get IPv4 routing table. */ |
1158 | ret = netlink_request (AF_INET, RTM_GETROUTE, &netlink_cmd); | |
1159 | if (ret < 0) | |
1160 | return ret; | |
1161 | ret = netlink_parse_info (netlink_routing_table, &netlink_cmd); | |
1162 | if (ret < 0) | |
1163 | return ret; | |
1164 | ||
1165 | #ifdef HAVE_IPV6 | |
1166 | /* Get IPv6 routing table. */ | |
1167 | ret = netlink_request (AF_INET6, RTM_GETROUTE, &netlink_cmd); | |
1168 | if (ret < 0) | |
1169 | return ret; | |
1170 | ret = netlink_parse_info (netlink_routing_table, &netlink_cmd); | |
1171 | if (ret < 0) | |
1172 | return ret; | |
1173 | #endif /* HAVE_IPV6 */ | |
1174 | ||
5f37d86f | 1175 | /* restore flags */ |
7021c425 | 1176 | if (snb_ret == 0) |
1177 | set_netlink_nonblocking (&netlink_cmd, &flags); | |
718e3744 | 1178 | return 0; |
1179 | } | |
1180 | ||
1181 | /* Utility function comes from iproute2. | |
1182 | Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> */ | |
1183 | int | |
1184 | addattr_l (struct nlmsghdr *n, int maxlen, int type, void *data, int alen) | |
1185 | { | |
1186 | int len; | |
1187 | struct rtattr *rta; | |
1188 | ||
7021c425 | 1189 | len = RTA_LENGTH (alen); |
718e3744 | 1190 | |
7021c425 | 1191 | if (NLMSG_ALIGN (n->nlmsg_len) + len > maxlen) |
718e3744 | 1192 | return -1; |
1193 | ||
7021c425 | 1194 | rta = (struct rtattr *) (((char *) n) + NLMSG_ALIGN (n->nlmsg_len)); |
718e3744 | 1195 | rta->rta_type = type; |
1196 | rta->rta_len = len; | |
7021c425 | 1197 | memcpy (RTA_DATA (rta), data, alen); |
718e3744 | 1198 | n->nlmsg_len = NLMSG_ALIGN (n->nlmsg_len) + len; |
1199 | ||
1200 | return 0; | |
1201 | } | |
1202 | ||
1203 | int | |
1204 | rta_addattr_l (struct rtattr *rta, int maxlen, int type, void *data, int alen) | |
1205 | { | |
1206 | int len; | |
1207 | struct rtattr *subrta; | |
1208 | ||
7021c425 | 1209 | len = RTA_LENGTH (alen); |
718e3744 | 1210 | |
7021c425 | 1211 | if (RTA_ALIGN (rta->rta_len) + len > maxlen) |
718e3744 | 1212 | return -1; |
1213 | ||
7021c425 | 1214 | subrta = (struct rtattr *) (((char *) rta) + RTA_ALIGN (rta->rta_len)); |
718e3744 | 1215 | subrta->rta_type = type; |
1216 | subrta->rta_len = len; | |
7021c425 | 1217 | memcpy (RTA_DATA (subrta), data, alen); |
718e3744 | 1218 | rta->rta_len = NLMSG_ALIGN (rta->rta_len) + len; |
1219 | ||
1220 | return 0; | |
1221 | } | |
1222 | ||
1223 | /* Utility function comes from iproute2. | |
1224 | Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> */ | |
1225 | int | |
1226 | addattr32 (struct nlmsghdr *n, int maxlen, int type, int data) | |
1227 | { | |
1228 | int len; | |
1229 | struct rtattr *rta; | |
7021c425 | 1230 | |
1231 | len = RTA_LENGTH (4); | |
1232 | ||
718e3744 | 1233 | if (NLMSG_ALIGN (n->nlmsg_len) + len > maxlen) |
1234 | return -1; | |
1235 | ||
7021c425 | 1236 | rta = (struct rtattr *) (((char *) n) + NLMSG_ALIGN (n->nlmsg_len)); |
718e3744 | 1237 | rta->rta_type = type; |
1238 | rta->rta_len = len; | |
7021c425 | 1239 | memcpy (RTA_DATA (rta), &data, 4); |
718e3744 | 1240 | n->nlmsg_len = NLMSG_ALIGN (n->nlmsg_len) + len; |
1241 | ||
1242 | return 0; | |
1243 | } | |
1244 | ||
1245 | static int | |
1246 | netlink_talk_filter (struct sockaddr_nl *snl, struct nlmsghdr *h) | |
1247 | { | |
b7ed1ec7 | 1248 | zlog_warn ("netlink_talk: ignoring message type 0x%04x", h->nlmsg_type); |
718e3744 | 1249 | return 0; |
1250 | } | |
1251 | ||
1252 | /* sendmsg() to netlink socket then recvmsg(). */ | |
1253 | int | |
1254 | netlink_talk (struct nlmsghdr *n, struct nlsock *nl) | |
1255 | { | |
1256 | int status; | |
1257 | struct sockaddr_nl snl; | |
7021c425 | 1258 | struct iovec iov = { (void *) n, n->nlmsg_len }; |
1259 | struct msghdr msg = { (void *) &snl, sizeof snl, &iov, 1, NULL, 0, 0 }; | |
718e3744 | 1260 | int flags = 0; |
5f37d86f | 1261 | int snb_ret; |
4be019d5 | 1262 | int save_errno; |
7021c425 | 1263 | |
718e3744 | 1264 | memset (&snl, 0, sizeof snl); |
1265 | snl.nl_family = AF_NETLINK; | |
7021c425 | 1266 | |
b7ed1ec7 | 1267 | n->nlmsg_seq = ++nl->seq; |
718e3744 | 1268 | |
1269 | /* Request an acknowledgement by setting NLM_F_ACK */ | |
1270 | n->nlmsg_flags |= NLM_F_ACK; | |
7021c425 | 1271 | |
1272 | if (IS_ZEBRA_DEBUG_KERNEL) | |
b7ed1ec7 | 1273 | zlog_debug ("netlink_talk: %s type %s(%u), seq=%u", nl->name, |
7021c425 | 1274 | lookup (nlmsg_str, n->nlmsg_type), n->nlmsg_type, |
1275 | n->nlmsg_seq); | |
718e3744 | 1276 | |
1277 | /* Send message to netlink interface. */ | |
7021c425 | 1278 | if (zserv_privs.change (ZPRIVS_RAISE)) |
1279 | zlog (NULL, LOG_ERR, "Can't raise privileges"); | |
718e3744 | 1280 | status = sendmsg (nl->sock, &msg, 0); |
4be019d5 | 1281 | save_errno = errno; |
7021c425 | 1282 | if (zserv_privs.change (ZPRIVS_LOWER)) |
1283 | zlog (NULL, LOG_ERR, "Can't lower privileges"); | |
1284 | ||
718e3744 | 1285 | if (status < 0) |
1286 | { | |
1287 | zlog (NULL, LOG_ERR, "netlink_talk sendmsg() error: %s", | |
4be019d5 | 1288 | safe_strerror (save_errno)); |
718e3744 | 1289 | return -1; |
1290 | } | |
7021c425 | 1291 | |
718e3744 | 1292 | /* |
1293 | * Change socket flags for blocking I/O. | |
1294 | * This ensures we wait for a reply in netlink_parse_info(). | |
1295 | */ | |
7021c425 | 1296 | snb_ret = set_netlink_blocking (nl, &flags); |
1297 | if (snb_ret < 0) | |
1298 | zlog (NULL, LOG_WARNING, | |
1299 | "%s:%i Warning: Could not set netlink socket to blocking.", | |
1300 | __FUNCTION__, __LINE__); | |
718e3744 | 1301 | |
1302 | /* | |
1303 | * Get reply from netlink socket. | |
1304 | * The reply should either be an acknowlegement or an error. | |
1305 | */ | |
1306 | status = netlink_parse_info (netlink_talk_filter, nl); | |
7021c425 | 1307 | |
718e3744 | 1308 | /* Restore socket flags for nonblocking I/O */ |
7021c425 | 1309 | if (snb_ret == 0) |
1310 | set_netlink_nonblocking (nl, &flags); | |
1311 | ||
718e3744 | 1312 | return status; |
1313 | } | |
1314 | ||
1315 | /* Routing table change via netlink interface. */ | |
1316 | int | |
1317 | netlink_route (int cmd, int family, void *dest, int length, void *gate, | |
7021c425 | 1318 | int index, int zebra_flags, int table) |
718e3744 | 1319 | { |
1320 | int ret; | |
1321 | int bytelen; | |
1322 | struct sockaddr_nl snl; | |
1323 | int discard; | |
1324 | ||
7021c425 | 1325 | struct |
718e3744 | 1326 | { |
1327 | struct nlmsghdr n; | |
1328 | struct rtmsg r; | |
1329 | char buf[1024]; | |
1330 | } req; | |
1331 | ||
1332 | memset (&req, 0, sizeof req); | |
1333 | ||
1334 | bytelen = (family == AF_INET ? 4 : 16); | |
1335 | ||
1336 | req.n.nlmsg_len = NLMSG_LENGTH (sizeof (struct rtmsg)); | |
1337 | req.n.nlmsg_flags = NLM_F_CREATE | NLM_F_REQUEST; | |
1338 | req.n.nlmsg_type = cmd; | |
1339 | req.r.rtm_family = family; | |
1340 | req.r.rtm_table = table; | |
1341 | req.r.rtm_dst_len = length; | |
1342 | ||
81dfcaa2 | 1343 | if ((zebra_flags & ZEBRA_FLAG_BLACKHOLE) |
1344 | || (zebra_flags & ZEBRA_FLAG_REJECT)) | |
718e3744 | 1345 | discard = 1; |
1346 | else | |
1347 | discard = 0; | |
1348 | ||
7021c425 | 1349 | if (cmd == RTM_NEWROUTE) |
718e3744 | 1350 | { |
1351 | req.r.rtm_protocol = RTPROT_ZEBRA; | |
1352 | req.r.rtm_scope = RT_SCOPE_UNIVERSE; | |
1353 | ||
7021c425 | 1354 | if (discard) |
595db7f1 | 1355 | { |
1356 | if (zebra_flags & ZEBRA_FLAG_BLACKHOLE) | |
1357 | req.r.rtm_type = RTN_BLACKHOLE; | |
1358 | else if (zebra_flags & ZEBRA_FLAG_REJECT) | |
1359 | req.r.rtm_type = RTN_UNREACHABLE; | |
7021c425 | 1360 | else |
1361 | assert (RTN_BLACKHOLE != RTN_UNREACHABLE); /* false */ | |
1362 | } | |
595db7f1 | 1363 | else |
7021c425 | 1364 | req.r.rtm_type = RTN_UNICAST; |
718e3744 | 1365 | } |
1366 | ||
1367 | if (dest) | |
1368 | addattr_l (&req.n, sizeof req, RTA_DST, dest, bytelen); | |
1369 | ||
7021c425 | 1370 | if (!discard) |
718e3744 | 1371 | { |
1372 | if (gate) | |
7021c425 | 1373 | addattr_l (&req.n, sizeof req, RTA_GATEWAY, gate, bytelen); |
718e3744 | 1374 | if (index > 0) |
7021c425 | 1375 | addattr32 (&req.n, sizeof req, RTA_OIF, index); |
718e3744 | 1376 | } |
1377 | ||
1378 | /* Destination netlink address. */ | |
1379 | memset (&snl, 0, sizeof snl); | |
1380 | snl.nl_family = AF_NETLINK; | |
1381 | ||
1382 | /* Talk to netlink socket. */ | |
b7ed1ec7 | 1383 | ret = netlink_talk (&req.n, &netlink_cmd); |
718e3744 | 1384 | if (ret < 0) |
1385 | return -1; | |
1386 | ||
1387 | return 0; | |
1388 | } | |
1389 | ||
1390 | /* Routing table change via netlink interface. */ | |
1391 | int | |
1392 | netlink_route_multipath (int cmd, struct prefix *p, struct rib *rib, | |
7021c425 | 1393 | int family) |
718e3744 | 1394 | { |
1395 | int bytelen; | |
1396 | struct sockaddr_nl snl; | |
1397 | struct nexthop *nexthop = NULL; | |
1398 | int nexthop_num = 0; | |
718e3744 | 1399 | int discard; |
1400 | ||
7021c425 | 1401 | struct |
718e3744 | 1402 | { |
1403 | struct nlmsghdr n; | |
1404 | struct rtmsg r; | |
1405 | char buf[1024]; | |
1406 | } req; | |
1407 | ||
1408 | memset (&req, 0, sizeof req); | |
1409 | ||
1410 | bytelen = (family == AF_INET ? 4 : 16); | |
1411 | ||
1412 | req.n.nlmsg_len = NLMSG_LENGTH (sizeof (struct rtmsg)); | |
1413 | req.n.nlmsg_flags = NLM_F_CREATE | NLM_F_REQUEST; | |
1414 | req.n.nlmsg_type = cmd; | |
1415 | req.r.rtm_family = family; | |
1416 | req.r.rtm_table = rib->table; | |
1417 | req.r.rtm_dst_len = p->prefixlen; | |
1418 | ||
7021c425 | 1419 | if ((rib->flags & ZEBRA_FLAG_BLACKHOLE) || (rib->flags & ZEBRA_FLAG_REJECT)) |
718e3744 | 1420 | discard = 1; |
1421 | else | |
1422 | discard = 0; | |
1423 | ||
7021c425 | 1424 | if (cmd == RTM_NEWROUTE) |
718e3744 | 1425 | { |
1426 | req.r.rtm_protocol = RTPROT_ZEBRA; | |
1427 | req.r.rtm_scope = RT_SCOPE_UNIVERSE; | |
1428 | ||
7021c425 | 1429 | if (discard) |
595db7f1 | 1430 | { |
1431 | if (rib->flags & ZEBRA_FLAG_BLACKHOLE) | |
1432 | req.r.rtm_type = RTN_BLACKHOLE; | |
1433 | else if (rib->flags & ZEBRA_FLAG_REJECT) | |
1434 | req.r.rtm_type = RTN_UNREACHABLE; | |
7021c425 | 1435 | else |
1436 | assert (RTN_BLACKHOLE != RTN_UNREACHABLE); /* false */ | |
1437 | } | |
595db7f1 | 1438 | else |
7021c425 | 1439 | req.r.rtm_type = RTN_UNICAST; |
718e3744 | 1440 | } |
1441 | ||
1442 | addattr_l (&req.n, sizeof req, RTA_DST, &p->u.prefix, bytelen); | |
1443 | ||
1444 | /* Metric. */ | |
1445 | addattr32 (&req.n, sizeof req, RTA_PRIORITY, rib->metric); | |
1446 | ||
1447 | if (discard) | |
1448 | { | |
1449 | if (cmd == RTM_NEWROUTE) | |
7021c425 | 1450 | for (nexthop = rib->nexthop; nexthop; nexthop = nexthop->next) |
1451 | SET_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB); | |
718e3744 | 1452 | goto skip; |
1453 | } | |
1454 | ||
1455 | /* Multipath case. */ | |
1456 | if (rib->nexthop_active_num == 1 || MULTIPATH_NUM == 1) | |
1457 | { | |
1458 | for (nexthop = rib->nexthop; nexthop; nexthop = nexthop->next) | |
7021c425 | 1459 | { |
1460 | ||
1461 | if ((cmd == RTM_NEWROUTE | |
1462 | && CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_ACTIVE)) | |
1463 | || (cmd == RTM_DELROUTE | |
1464 | && CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB))) | |
1465 | { | |
1466 | ||
1467 | if (CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_RECURSIVE)) | |
1468 | { | |
1469 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1470 | { | |
b6178002 | 1471 | zlog_debug |
7021c425 | 1472 | ("netlink_route_multipath() (recursive, 1 hop): " |
206d8055 | 1473 | "%s %s/%d, type %s", lookup (nlmsg_str, cmd), |
1ada8198 | 1474 | #ifdef HAVE_IPV6 |
206d8055 | 1475 | (family == AF_INET) ? inet_ntoa (p->u.prefix4) : |
1ada8198 | 1476 | inet6_ntoa (p->u.prefix6), |
1477 | #else | |
1478 | inet_ntoa (p->u.prefix4), | |
1479 | #endif /* HAVE_IPV6 */ | |
1480 | ||
1481 | p->prefixlen, nexthop_types_desc[nexthop->rtype]); | |
7021c425 | 1482 | } |
1483 | ||
1484 | if (nexthop->rtype == NEXTHOP_TYPE_IPV4 | |
1485 | || nexthop->rtype == NEXTHOP_TYPE_IPV4_IFINDEX) | |
206d8055 | 1486 | { |
1487 | addattr_l (&req.n, sizeof req, RTA_GATEWAY, | |
1488 | &nexthop->rgate.ipv4, bytelen); | |
1489 | ||
1490 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1491 | zlog_debug("netlink_route_multipath() (recursive, " | |
1492 | "1 hop): nexthop via %s if %u", | |
1493 | inet_ntoa (nexthop->rgate.ipv4), | |
1494 | nexthop->rifindex); | |
1495 | } | |
718e3744 | 1496 | #ifdef HAVE_IPV6 |
7021c425 | 1497 | if (nexthop->rtype == NEXTHOP_TYPE_IPV6 |
1498 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFINDEX | |
1499 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFNAME) | |
206d8055 | 1500 | { |
1501 | addattr_l (&req.n, sizeof req, RTA_GATEWAY, | |
1502 | &nexthop->rgate.ipv6, bytelen); | |
1503 | ||
1504 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1505 | zlog_debug("netlink_route_multipath() (recursive, " | |
1506 | "1 hop): nexthop via %s if %u", | |
1507 | inet6_ntoa (nexthop->rgate.ipv6), | |
1508 | nexthop->rifindex); | |
1509 | } | |
718e3744 | 1510 | #endif /* HAVE_IPV6 */ |
7021c425 | 1511 | if (nexthop->rtype == NEXTHOP_TYPE_IFINDEX |
1512 | || nexthop->rtype == NEXTHOP_TYPE_IFNAME | |
1513 | || nexthop->rtype == NEXTHOP_TYPE_IPV4_IFINDEX | |
1514 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFINDEX | |
1515 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFNAME) | |
206d8055 | 1516 | { |
1517 | addattr32 (&req.n, sizeof req, RTA_OIF, | |
1518 | nexthop->rifindex); | |
1519 | ||
1520 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1521 | zlog_debug("netlink_route_multipath() (recursive, " | |
1522 | "1 hop): nexthop via if %u", | |
1523 | nexthop->rifindex); | |
1524 | } | |
7021c425 | 1525 | } |
1526 | else | |
1527 | { | |
1528 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1529 | { | |
b6178002 | 1530 | zlog_debug |
206d8055 | 1531 | ("netlink_route_multipath() (single hop): " |
1532 | "%s %s/%d, type %s", lookup (nlmsg_str, cmd), | |
1ada8198 | 1533 | #ifdef HAVE_IPV6 |
206d8055 | 1534 | (family == AF_INET) ? inet_ntoa (p->u.prefix4) : |
1ada8198 | 1535 | inet6_ntoa (p->u.prefix6), |
1536 | #else | |
1537 | inet_ntoa (p->u.prefix4), | |
1538 | #endif /* HAVE_IPV6 */ | |
1539 | p->prefixlen, nexthop_types_desc[nexthop->type]); | |
7021c425 | 1540 | } |
1541 | ||
1542 | if (nexthop->type == NEXTHOP_TYPE_IPV4 | |
1543 | || nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX) | |
206d8055 | 1544 | { |
1545 | addattr_l (&req.n, sizeof req, RTA_GATEWAY, | |
1546 | &nexthop->gate.ipv4, bytelen); | |
1547 | ||
1548 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1549 | zlog_debug("netlink_route_multipath() (single hop): " | |
1550 | "nexthop via %s if %u", | |
1551 | inet_ntoa (nexthop->gate.ipv4), | |
1552 | nexthop->ifindex); | |
1553 | } | |
718e3744 | 1554 | #ifdef HAVE_IPV6 |
7021c425 | 1555 | if (nexthop->type == NEXTHOP_TYPE_IPV6 |
1556 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFNAME | |
1557 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX) | |
206d8055 | 1558 | { |
1559 | addattr_l (&req.n, sizeof req, RTA_GATEWAY, | |
1560 | &nexthop->gate.ipv6, bytelen); | |
1561 | ||
1562 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1563 | zlog_debug("netlink_route_multipath() (single hop): " | |
1564 | "nexthop via %s if %u", | |
1565 | inet6_ntoa (nexthop->gate.ipv6), | |
1566 | nexthop->ifindex); | |
1567 | } | |
718e3744 | 1568 | #endif /* HAVE_IPV6 */ |
7021c425 | 1569 | if (nexthop->type == NEXTHOP_TYPE_IFINDEX |
1570 | || nexthop->type == NEXTHOP_TYPE_IFNAME | |
1571 | || nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX | |
1572 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX | |
1573 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFNAME) | |
206d8055 | 1574 | { |
1575 | addattr32 (&req.n, sizeof req, RTA_OIF, nexthop->ifindex); | |
1576 | ||
1577 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1578 | zlog_debug("netlink_route_multipath() (single hop): " | |
1579 | "nexthop via if %u", nexthop->ifindex); | |
1580 | } | |
7021c425 | 1581 | } |
1582 | ||
1583 | if (cmd == RTM_NEWROUTE) | |
1584 | SET_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB); | |
1585 | ||
1586 | nexthop_num++; | |
1587 | break; | |
1588 | } | |
1589 | } | |
718e3744 | 1590 | } |
1591 | else | |
1592 | { | |
1593 | char buf[1024]; | |
1594 | struct rtattr *rta = (void *) buf; | |
1595 | struct rtnexthop *rtnh; | |
1596 | ||
1597 | rta->rta_type = RTA_MULTIPATH; | |
7021c425 | 1598 | rta->rta_len = RTA_LENGTH (0); |
1599 | rtnh = RTA_DATA (rta); | |
718e3744 | 1600 | |
1601 | nexthop_num = 0; | |
1602 | for (nexthop = rib->nexthop; | |
7021c425 | 1603 | nexthop && (MULTIPATH_NUM == 0 || nexthop_num < MULTIPATH_NUM); |
1604 | nexthop = nexthop->next) | |
1605 | { | |
1606 | if ((cmd == RTM_NEWROUTE | |
1607 | && CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_ACTIVE)) | |
1608 | || (cmd == RTM_DELROUTE | |
1609 | && CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB))) | |
1610 | { | |
1611 | nexthop_num++; | |
1612 | ||
1613 | rtnh->rtnh_len = sizeof (*rtnh); | |
1614 | rtnh->rtnh_flags = 0; | |
1615 | rtnh->rtnh_hops = 0; | |
1616 | rta->rta_len += rtnh->rtnh_len; | |
1617 | ||
1618 | if (CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_RECURSIVE)) | |
1619 | { | |
1620 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1621 | { | |
b6178002 | 1622 | zlog_debug ("netlink_route_multipath() " |
206d8055 | 1623 | "(recursive, multihop): %s %s/%d type %s", |
1ada8198 | 1624 | lookup (nlmsg_str, cmd), |
1625 | #ifdef HAVE_IPV6 | |
1626 | (family == AF_INET) ? inet_ntoa (p->u.prefix4) : | |
1627 | inet6_ntoa (p->u.prefix6), | |
1628 | #else | |
1629 | inet_ntoa (p->u.prefix4), | |
1630 | #endif /* HAVE_IPV6 */ | |
206d8055 | 1631 | p->prefixlen, nexthop_types_desc[nexthop->rtype]); |
7021c425 | 1632 | } |
1633 | if (nexthop->rtype == NEXTHOP_TYPE_IPV4 | |
1634 | || nexthop->rtype == NEXTHOP_TYPE_IPV4_IFINDEX) | |
1635 | { | |
1636 | rta_addattr_l (rta, 4096, RTA_GATEWAY, | |
1637 | &nexthop->rgate.ipv4, bytelen); | |
1638 | rtnh->rtnh_len += sizeof (struct rtattr) + 4; | |
206d8055 | 1639 | |
1640 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1641 | zlog_debug("netlink_route_multipath() (recursive, " | |
1642 | "multihop): nexthop via %s if %u", | |
1643 | inet_ntoa (nexthop->rgate.ipv4), | |
1644 | nexthop->rifindex); | |
7021c425 | 1645 | } |
718e3744 | 1646 | #ifdef HAVE_IPV6 |
7021c425 | 1647 | if (nexthop->rtype == NEXTHOP_TYPE_IPV6 |
1648 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFNAME | |
1649 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFINDEX) | |
206d8055 | 1650 | { |
1651 | rta_addattr_l (rta, 4096, RTA_GATEWAY, | |
1652 | &nexthop->rgate.ipv6, bytelen); | |
1653 | ||
1654 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1655 | zlog_debug("netlink_route_multipath() (recursive, " | |
1656 | "multihop): nexthop via %s if %u", | |
1657 | inet6_ntoa (nexthop->rgate.ipv6), | |
1658 | nexthop->rifindex); | |
1659 | } | |
718e3744 | 1660 | #endif /* HAVE_IPV6 */ |
7021c425 | 1661 | /* ifindex */ |
1662 | if (nexthop->rtype == NEXTHOP_TYPE_IFINDEX | |
1663 | || nexthop->rtype == NEXTHOP_TYPE_IFNAME | |
1664 | || nexthop->rtype == NEXTHOP_TYPE_IPV4_IFINDEX | |
1665 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFINDEX | |
1666 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFNAME) | |
206d8055 | 1667 | { |
1668 | rtnh->rtnh_ifindex = nexthop->rifindex; | |
1669 | ||
1670 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1671 | zlog_debug("netlink_route_multipath() (recursive, " | |
1672 | "multihop): nexthop via if %u", | |
1673 | nexthop->rifindex); | |
1674 | } | |
7021c425 | 1675 | else |
206d8055 | 1676 | { |
1677 | rtnh->rtnh_ifindex = 0; | |
1678 | } | |
7021c425 | 1679 | } |
1680 | else | |
1681 | { | |
1682 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1683 | { | |
206d8055 | 1684 | zlog_debug ("netlink_route_multipath() (multihop): " |
1685 | "%s %s/%d, type %s", lookup (nlmsg_str, cmd), | |
1ada8198 | 1686 | #ifdef HAVE_IPV6 |
206d8055 | 1687 | (family == AF_INET) ? inet_ntoa (p->u.prefix4) : |
1ada8198 | 1688 | inet6_ntoa (p->u.prefix6), |
1689 | #else | |
1690 | inet_ntoa (p->u.prefix4), | |
1691 | #endif /* HAVE_IPV6 */ | |
1692 | p->prefixlen, nexthop_types_desc[nexthop->type]); | |
7021c425 | 1693 | } |
1694 | if (nexthop->type == NEXTHOP_TYPE_IPV4 | |
1695 | || nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX) | |
1696 | { | |
206d8055 | 1697 | rta_addattr_l (rta, 4096, RTA_GATEWAY, |
1698 | &nexthop->gate.ipv4, bytelen); | |
1699 | rtnh->rtnh_len += sizeof (struct rtattr) + 4; | |
1700 | ||
1701 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1702 | zlog_debug("netlink_route_multipath() (multihop): " | |
1703 | "nexthop via %s if %u", | |
1704 | inet_ntoa (nexthop->gate.ipv4), | |
1705 | nexthop->ifindex); | |
7021c425 | 1706 | } |
718e3744 | 1707 | #ifdef HAVE_IPV6 |
7021c425 | 1708 | if (nexthop->type == NEXTHOP_TYPE_IPV6 |
1709 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFNAME | |
1710 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX) | |
206d8055 | 1711 | { |
1712 | rta_addattr_l (rta, 4096, RTA_GATEWAY, | |
1713 | &nexthop->gate.ipv6, bytelen); | |
1714 | ||
1715 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1716 | zlog_debug("netlink_route_multipath() (multihop): " | |
1717 | "nexthop via %s if %u", | |
1718 | inet6_ntoa (nexthop->gate.ipv6), | |
1719 | nexthop->ifindex); | |
1720 | } | |
718e3744 | 1721 | #endif /* HAVE_IPV6 */ |
7021c425 | 1722 | /* ifindex */ |
1723 | if (nexthop->type == NEXTHOP_TYPE_IFINDEX | |
1724 | || nexthop->type == NEXTHOP_TYPE_IFNAME | |
1725 | || nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX | |
1726 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFNAME | |
1727 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX) | |
206d8055 | 1728 | { |
1729 | rtnh->rtnh_ifindex = nexthop->ifindex; | |
1730 | ||
1731 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1732 | zlog_debug("netlink_route_multipath() (multihop): " | |
1733 | "nexthop via if %u", nexthop->ifindex); | |
1734 | } | |
7021c425 | 1735 | else |
206d8055 | 1736 | { |
1737 | rtnh->rtnh_ifindex = 0; | |
1738 | } | |
7021c425 | 1739 | } |
1740 | rtnh = RTNH_NEXT (rtnh); | |
1741 | ||
1742 | if (cmd == RTM_NEWROUTE) | |
1743 | SET_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB); | |
1744 | } | |
1745 | } | |
718e3744 | 1746 | |
1747 | if (rta->rta_len > RTA_LENGTH (0)) | |
7021c425 | 1748 | addattr_l (&req.n, 1024, RTA_MULTIPATH, RTA_DATA (rta), |
1749 | RTA_PAYLOAD (rta)); | |
718e3744 | 1750 | } |
1751 | ||
1752 | /* If there is no useful nexthop then return. */ | |
1753 | if (nexthop_num == 0) | |
1754 | { | |
1755 | if (IS_ZEBRA_DEBUG_KERNEL) | |
b6178002 | 1756 | zlog_debug ("netlink_route_multipath(): No useful nexthop."); |
718e3744 | 1757 | return 0; |
1758 | } | |
1759 | ||
7021c425 | 1760 | skip: |
718e3744 | 1761 | |
1762 | /* Destination netlink address. */ | |
1763 | memset (&snl, 0, sizeof snl); | |
1764 | snl.nl_family = AF_NETLINK; | |
1765 | ||
718e3744 | 1766 | /* Talk to netlink socket. */ |
b7ed1ec7 | 1767 | return netlink_talk (&req.n, &netlink_cmd); |
718e3744 | 1768 | } |
1769 | ||
1770 | int | |
1771 | kernel_add_ipv4 (struct prefix *p, struct rib *rib) | |
1772 | { | |
1773 | return netlink_route_multipath (RTM_NEWROUTE, p, rib, AF_INET); | |
1774 | } | |
1775 | ||
1776 | int | |
1777 | kernel_delete_ipv4 (struct prefix *p, struct rib *rib) | |
1778 | { | |
1779 | return netlink_route_multipath (RTM_DELROUTE, p, rib, AF_INET); | |
1780 | } | |
1781 | ||
1782 | #ifdef HAVE_IPV6 | |
1783 | int | |
1784 | kernel_add_ipv6 (struct prefix *p, struct rib *rib) | |
1785 | { | |
1786 | return netlink_route_multipath (RTM_NEWROUTE, p, rib, AF_INET6); | |
1787 | } | |
1788 | ||
1789 | int | |
1790 | kernel_delete_ipv6 (struct prefix *p, struct rib *rib) | |
1791 | { | |
1792 | return netlink_route_multipath (RTM_DELROUTE, p, rib, AF_INET6); | |
1793 | } | |
1794 | ||
1795 | /* Delete IPv6 route from the kernel. */ | |
1796 | int | |
1797 | kernel_delete_ipv6_old (struct prefix_ipv6 *dest, struct in6_addr *gate, | |
7021c425 | 1798 | int index, int flags, int table) |
718e3744 | 1799 | { |
7021c425 | 1800 | return netlink_route (RTM_DELROUTE, AF_INET6, &dest->prefix, |
1801 | dest->prefixlen, gate, index, flags, table); | |
718e3744 | 1802 | } |
1803 | #endif /* HAVE_IPV6 */ | |
1804 | \f | |
1805 | /* Interface address modification. */ | |
1806 | int | |
1807 | netlink_address (int cmd, int family, struct interface *ifp, | |
7021c425 | 1808 | struct connected *ifc) |
718e3744 | 1809 | { |
1810 | int bytelen; | |
1811 | struct prefix *p; | |
1812 | ||
7021c425 | 1813 | struct |
718e3744 | 1814 | { |
1815 | struct nlmsghdr n; | |
1816 | struct ifaddrmsg ifa; | |
1817 | char buf[1024]; | |
1818 | } req; | |
1819 | ||
1820 | p = ifc->address; | |
1821 | memset (&req, 0, sizeof req); | |
1822 | ||
1823 | bytelen = (family == AF_INET ? 4 : 16); | |
1824 | ||
7021c425 | 1825 | req.n.nlmsg_len = NLMSG_LENGTH (sizeof (struct ifaddrmsg)); |
718e3744 | 1826 | req.n.nlmsg_flags = NLM_F_REQUEST; |
1827 | req.n.nlmsg_type = cmd; | |
1828 | req.ifa.ifa_family = family; | |
1829 | ||
1830 | req.ifa.ifa_index = ifp->ifindex; | |
1831 | req.ifa.ifa_prefixlen = p->prefixlen; | |
1832 | ||
1833 | addattr_l (&req.n, sizeof req, IFA_LOCAL, &p->u.prefix, bytelen); | |
1834 | ||
1835 | if (family == AF_INET && cmd == RTM_NEWADDR) | |
1836 | { | |
1837 | if (if_is_broadcast (ifp) && ifc->destination) | |
7021c425 | 1838 | { |
1839 | p = ifc->destination; | |
1840 | addattr_l (&req.n, sizeof req, IFA_BROADCAST, &p->u.prefix, | |
1841 | bytelen); | |
1842 | } | |
718e3744 | 1843 | } |
1844 | ||
1845 | if (CHECK_FLAG (ifc->flags, ZEBRA_IFA_SECONDARY)) | |
1846 | SET_FLAG (req.ifa.ifa_flags, IFA_F_SECONDARY); | |
7021c425 | 1847 | |
718e3744 | 1848 | if (ifc->label) |
1849 | addattr_l (&req.n, sizeof req, IFA_LABEL, ifc->label, | |
7021c425 | 1850 | strlen (ifc->label) + 1); |
718e3744 | 1851 | |
1852 | return netlink_talk (&req.n, &netlink_cmd); | |
1853 | } | |
1854 | ||
1855 | int | |
1856 | kernel_address_add_ipv4 (struct interface *ifp, struct connected *ifc) | |
1857 | { | |
1858 | return netlink_address (RTM_NEWADDR, AF_INET, ifp, ifc); | |
1859 | } | |
1860 | ||
1861 | int | |
1862 | kernel_address_delete_ipv4 (struct interface *ifp, struct connected *ifc) | |
1863 | { | |
1864 | return netlink_address (RTM_DELADDR, AF_INET, ifp, ifc); | |
1865 | } | |
1866 | ||
718e3744 | 1867 | |
1868 | extern struct thread_master *master; | |
1869 | ||
1870 | /* Kernel route reflection. */ | |
1871 | int | |
1872 | kernel_read (struct thread *thread) | |
1873 | { | |
1874 | int ret; | |
1875 | int sock; | |
1876 | ||
1877 | sock = THREAD_FD (thread); | |
1878 | ret = netlink_parse_info (netlink_information_fetch, &netlink); | |
b21b19c5 | 1879 | thread_add_read (zebrad.master, kernel_read, NULL, netlink.sock); |
718e3744 | 1880 | |
1881 | return 0; | |
1882 | } | |
1883 | ||
1884 | /* Exported interface function. This function simply calls | |
1885 | netlink_socket (). */ | |
1886 | void | |
1887 | kernel_init () | |
1888 | { | |
1889 | unsigned long groups; | |
1890 | ||
7021c425 | 1891 | groups = RTMGRP_LINK | RTMGRP_IPV4_ROUTE | RTMGRP_IPV4_IFADDR; |
718e3744 | 1892 | #ifdef HAVE_IPV6 |
7021c425 | 1893 | groups |= RTMGRP_IPV6_ROUTE | RTMGRP_IPV6_IFADDR; |
718e3744 | 1894 | #endif /* HAVE_IPV6 */ |
1895 | netlink_socket (&netlink, groups); | |
1896 | netlink_socket (&netlink_cmd, 0); | |
1897 | ||
1898 | /* Register kernel socket. */ | |
1899 | if (netlink.sock > 0) | |
b21b19c5 | 1900 | thread_add_read (zebrad.master, kernel_read, NULL, netlink.sock); |
718e3744 | 1901 | } |