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