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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" | |
6621ca86 | 40 | #include "zebra/rt.h" |
718e3744 | 41 | #include "zebra/redistribute.h" |
42 | #include "zebra/interface.h" | |
43 | #include "zebra/debug.h" | |
44 | ||
45 | /* Socket interface to kernel */ | |
46 | struct nlsock | |
47 | { | |
48 | int sock; | |
49 | int seq; | |
50 | struct sockaddr_nl snl; | |
fce954f8 | 51 | const char *name; |
7021c425 | 52 | } netlink = { -1, 0, {0}, "netlink-listen"}, /* kernel messages */ |
1ada8198 | 53 | netlink_cmd = { -1, 0, {0}, "netlink-cmd"}; /* command 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", | |
fa59980f | 76 | "IPv6 nexthop", |
7021c425 | 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 | ||
d2fc8896 | 89 | /* Note: on netlink systems, there should be a 1-to-1 mapping between interface |
90 | names and ifindex values. */ | |
91 | static void | |
92 | set_ifindex(struct interface *ifp, unsigned int ifi_index) | |
93 | { | |
94 | struct interface *oifp; | |
95 | ||
96 | if (((oifp = if_lookup_by_index(ifi_index)) != NULL) && (oifp != ifp)) | |
97 | { | |
98 | if (ifi_index == IFINDEX_INTERNAL) | |
99 | zlog_err("Netlink is setting interface %s ifindex to reserved " | |
100 | "internal value %u", ifp->name, ifi_index); | |
101 | else | |
102 | { | |
103 | if (IS_ZEBRA_DEBUG_KERNEL) | |
104 | zlog_debug("interface index %d was renamed from %s to %s", | |
105 | ifi_index, oifp->name, ifp->name); | |
106 | if (if_is_up(oifp)) | |
107 | zlog_err("interface rename detected on up interface: index %d " | |
108 | "was renamed from %s to %s, results are uncertain!", | |
109 | ifi_index, oifp->name, ifp->name); | |
110 | if_delete_update(oifp); | |
111 | } | |
112 | } | |
113 | ifp->ifindex = ifi_index; | |
114 | } | |
115 | ||
718e3744 | 116 | /* Make socket for Linux netlink interface. */ |
117 | static int | |
118 | netlink_socket (struct nlsock *nl, unsigned long groups) | |
119 | { | |
120 | int ret; | |
121 | struct sockaddr_nl snl; | |
122 | int sock; | |
123 | int namelen; | |
4be019d5 | 124 | int save_errno; |
718e3744 | 125 | |
126 | sock = socket (AF_NETLINK, SOCK_RAW, NETLINK_ROUTE); | |
127 | if (sock < 0) | |
128 | { | |
129 | zlog (NULL, LOG_ERR, "Can't open %s socket: %s", nl->name, | |
6099b3b5 | 130 | safe_strerror (errno)); |
718e3744 | 131 | return -1; |
132 | } | |
133 | ||
134 | ret = fcntl (sock, F_SETFL, O_NONBLOCK); | |
135 | if (ret < 0) | |
136 | { | |
137 | zlog (NULL, LOG_ERR, "Can't set %s socket flags: %s", nl->name, | |
6099b3b5 | 138 | safe_strerror (errno)); |
718e3744 | 139 | close (sock); |
140 | return -1; | |
141 | } | |
7021c425 | 142 | |
c34b6b57 | 143 | /* Set receive buffer size if it's set from command line */ |
144 | if (nl_rcvbufsize) | |
145 | { | |
146 | u_int32_t oldsize, oldlen; | |
147 | u_int32_t newsize, newlen; | |
148 | ||
149 | oldlen = sizeof(oldsize); | |
150 | newlen = sizeof(newsize); | |
151 | ||
152 | ret = getsockopt(sock, SOL_SOCKET, SO_RCVBUF, &oldsize, &oldlen); | |
153 | if (ret < 0) | |
154 | { | |
155 | zlog (NULL, LOG_ERR, "Can't get %s receive buffer size: %s", nl->name, | |
6099b3b5 | 156 | safe_strerror (errno)); |
c34b6b57 | 157 | close (sock); |
158 | return -1; | |
159 | } | |
160 | ||
161 | ret = setsockopt(sock, SOL_SOCKET, SO_RCVBUF, &nl_rcvbufsize, | |
162 | sizeof(nl_rcvbufsize)); | |
163 | if (ret < 0) | |
164 | { | |
165 | zlog (NULL, LOG_ERR, "Can't set %s receive buffer size: %s", nl->name, | |
6099b3b5 | 166 | safe_strerror (errno)); |
c34b6b57 | 167 | close (sock); |
168 | return -1; | |
169 | } | |
170 | ||
171 | ret = getsockopt(sock, SOL_SOCKET, SO_RCVBUF, &newsize, &newlen); | |
172 | if (ret < 0) | |
173 | { | |
174 | zlog (NULL, LOG_ERR, "Can't get %s receive buffer size: %s", nl->name, | |
6099b3b5 | 175 | safe_strerror (errno)); |
c34b6b57 | 176 | close (sock); |
177 | return -1; | |
178 | } | |
179 | ||
180 | zlog (NULL, LOG_INFO, | |
181 | "Setting netlink socket receive buffer size: %u -> %u", | |
182 | oldsize, newsize); | |
183 | } | |
184 | ||
718e3744 | 185 | memset (&snl, 0, sizeof snl); |
186 | snl.nl_family = AF_NETLINK; | |
187 | snl.nl_groups = groups; | |
188 | ||
189 | /* Bind the socket to the netlink structure for anything. */ | |
7021c425 | 190 | if (zserv_privs.change (ZPRIVS_RAISE)) |
191 | { | |
192 | zlog (NULL, LOG_ERR, "Can't raise privileges"); | |
193 | return -1; | |
194 | } | |
edd7c245 | 195 | |
718e3744 | 196 | ret = bind (sock, (struct sockaddr *) &snl, sizeof snl); |
4be019d5 | 197 | save_errno = errno; |
55e7ecd1 | 198 | if (zserv_privs.change (ZPRIVS_LOWER)) |
199 | zlog (NULL, LOG_ERR, "Can't lower privileges"); | |
200 | ||
718e3744 | 201 | if (ret < 0) |
202 | { | |
7021c425 | 203 | zlog (NULL, LOG_ERR, "Can't bind %s socket to group 0x%x: %s", |
4be019d5 | 204 | nl->name, snl.nl_groups, safe_strerror (save_errno)); |
718e3744 | 205 | close (sock); |
206 | return -1; | |
207 | } | |
7021c425 | 208 | |
718e3744 | 209 | /* multiple netlink sockets will have different nl_pid */ |
210 | namelen = sizeof snl; | |
c9e52be3 | 211 | ret = getsockname (sock, (struct sockaddr *) &snl, (socklen_t *) &namelen); |
718e3744 | 212 | if (ret < 0 || namelen != sizeof snl) |
213 | { | |
214 | zlog (NULL, LOG_ERR, "Can't get %s socket name: %s", nl->name, | |
6099b3b5 | 215 | safe_strerror (errno)); |
718e3744 | 216 | close (sock); |
217 | return -1; | |
218 | } | |
219 | ||
220 | nl->snl = snl; | |
221 | nl->sock = sock; | |
222 | return ret; | |
223 | } | |
224 | ||
7021c425 | 225 | int |
226 | set_netlink_blocking (struct nlsock *nl, int *flags) | |
5f37d86f | 227 | { |
228 | ||
229 | /* Change socket flags for blocking I/O. */ | |
7021c425 | 230 | if ((*flags = fcntl (nl->sock, F_GETFL, 0)) < 0) |
5f37d86f | 231 | { |
7021c425 | 232 | zlog (NULL, LOG_ERR, "%s:%i F_GETFL error: %s", |
6099b3b5 | 233 | __FUNCTION__, __LINE__, safe_strerror (errno)); |
5f37d86f | 234 | return -1; |
235 | } | |
236 | *flags &= ~O_NONBLOCK; | |
7021c425 | 237 | if (fcntl (nl->sock, F_SETFL, *flags) < 0) |
5f37d86f | 238 | { |
7021c425 | 239 | zlog (NULL, LOG_ERR, "%s:%i F_SETFL error: %s", |
6099b3b5 | 240 | __FUNCTION__, __LINE__, safe_strerror (errno)); |
5f37d86f | 241 | return -1; |
242 | } | |
243 | return 0; | |
244 | } | |
245 | ||
7021c425 | 246 | int |
247 | set_netlink_nonblocking (struct nlsock *nl, int *flags) | |
248 | { | |
5f37d86f | 249 | /* Restore socket flags for nonblocking I/O */ |
250 | *flags |= O_NONBLOCK; | |
7021c425 | 251 | if (fcntl (nl->sock, F_SETFL, *flags) < 0) |
5f37d86f | 252 | { |
7021c425 | 253 | zlog (NULL, LOG_ERR, "%s:%i F_SETFL error: %s", |
6099b3b5 | 254 | __FUNCTION__, __LINE__, safe_strerror (errno)); |
5f37d86f | 255 | return -1; |
256 | } | |
257 | return 0; | |
258 | } | |
259 | ||
718e3744 | 260 | /* Get type specified information from netlink. */ |
261 | static int | |
262 | netlink_request (int family, int type, struct nlsock *nl) | |
263 | { | |
264 | int ret; | |
265 | struct sockaddr_nl snl; | |
4be019d5 | 266 | int save_errno; |
718e3744 | 267 | |
268 | struct | |
269 | { | |
270 | struct nlmsghdr nlh; | |
271 | struct rtgenmsg g; | |
272 | } req; | |
273 | ||
274 | ||
275 | /* Check netlink socket. */ | |
276 | if (nl->sock < 0) | |
277 | { | |
278 | zlog (NULL, LOG_ERR, "%s socket isn't active.", nl->name); | |
279 | return -1; | |
280 | } | |
281 | ||
282 | memset (&snl, 0, sizeof snl); | |
283 | snl.nl_family = AF_NETLINK; | |
284 | ||
c05612b9 | 285 | memset (&req, 0, sizeof req); |
718e3744 | 286 | req.nlh.nlmsg_len = sizeof req; |
287 | req.nlh.nlmsg_type = type; | |
288 | req.nlh.nlmsg_flags = NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST; | |
289 | req.nlh.nlmsg_pid = 0; | |
290 | req.nlh.nlmsg_seq = ++nl->seq; | |
291 | req.g.rtgen_family = family; | |
edd7c245 | 292 | |
293 | /* linux appears to check capabilities on every message | |
294 | * have to raise caps for every message sent | |
295 | */ | |
7021c425 | 296 | if (zserv_privs.change (ZPRIVS_RAISE)) |
edd7c245 | 297 | { |
298 | zlog (NULL, LOG_ERR, "Can't raise privileges"); | |
299 | return -1; | |
300 | } | |
7021c425 | 301 | |
302 | ret = sendto (nl->sock, (void *) &req, sizeof req, 0, | |
303 | (struct sockaddr *) &snl, sizeof snl); | |
4be019d5 | 304 | save_errno = errno; |
7021c425 | 305 | |
306 | if (zserv_privs.change (ZPRIVS_LOWER)) | |
307 | zlog (NULL, LOG_ERR, "Can't lower privileges"); | |
308 | ||
718e3744 | 309 | if (ret < 0) |
7021c425 | 310 | { |
311 | zlog (NULL, LOG_ERR, "%s sendto failed: %s", nl->name, | |
4be019d5 | 312 | safe_strerror (save_errno)); |
718e3744 | 313 | return -1; |
314 | } | |
edd7c245 | 315 | |
718e3744 | 316 | return 0; |
317 | } | |
318 | ||
319 | /* Receive message from netlink interface and pass those information | |
320 | to the given function. */ | |
321 | static int | |
322 | netlink_parse_info (int (*filter) (struct sockaddr_nl *, struct nlmsghdr *), | |
7021c425 | 323 | struct nlsock *nl) |
718e3744 | 324 | { |
325 | int status; | |
326 | int ret = 0; | |
327 | int error; | |
328 | ||
329 | while (1) | |
330 | { | |
331 | char buf[4096]; | |
332 | struct iovec iov = { buf, sizeof buf }; | |
333 | struct sockaddr_nl snl; | |
7021c425 | 334 | struct msghdr msg = { (void *) &snl, sizeof snl, &iov, 1, NULL, 0, 0 }; |
718e3744 | 335 | struct nlmsghdr *h; |
4be019d5 | 336 | int save_errno; |
718e3744 | 337 | |
7021c425 | 338 | if (zserv_privs.change (ZPRIVS_RAISE)) |
edd7c245 | 339 | zlog (NULL, LOG_ERR, "Can't raise privileges"); |
7021c425 | 340 | |
718e3744 | 341 | status = recvmsg (nl->sock, &msg, 0); |
4be019d5 | 342 | save_errno = errno; |
7021c425 | 343 | |
344 | if (zserv_privs.change (ZPRIVS_LOWER)) | |
edd7c245 | 345 | zlog (NULL, LOG_ERR, "Can't lower privileges"); |
718e3744 | 346 | |
347 | if (status < 0) | |
7021c425 | 348 | { |
4be019d5 | 349 | if (save_errno == EINTR) |
7021c425 | 350 | continue; |
4be019d5 | 351 | if (save_errno == EWOULDBLOCK || save_errno == EAGAIN) |
7021c425 | 352 | break; |
4be019d5 | 353 | zlog (NULL, LOG_ERR, "%s recvmsg overrun: %s", |
354 | nl->name, safe_strerror(save_errno)); | |
7021c425 | 355 | continue; |
356 | } | |
718e3744 | 357 | |
358 | if (status == 0) | |
7021c425 | 359 | { |
360 | zlog (NULL, LOG_ERR, "%s EOF", nl->name); | |
361 | return -1; | |
362 | } | |
718e3744 | 363 | |
364 | if (msg.msg_namelen != sizeof snl) | |
7021c425 | 365 | { |
366 | zlog (NULL, LOG_ERR, "%s sender address length error: length %d", | |
367 | nl->name, msg.msg_namelen); | |
368 | return -1; | |
369 | } | |
b84d3a1b | 370 | |
371 | /* JF: Ignore messages that aren't from the kernel */ | |
372 | if ( snl.nl_pid != 0 ) | |
373 | { | |
374 | zlog ( NULL, LOG_ERR, "Ignoring message from pid %u", snl.nl_pid ); | |
375 | continue; | |
376 | } | |
7021c425 | 377 | |
206d8055 | 378 | for (h = (struct nlmsghdr *) buf; NLMSG_OK (h, (unsigned int) status); |
7021c425 | 379 | h = NLMSG_NEXT (h, status)) |
380 | { | |
381 | /* Finish of reading. */ | |
382 | if (h->nlmsg_type == NLMSG_DONE) | |
383 | return ret; | |
384 | ||
385 | /* Error handling. */ | |
386 | if (h->nlmsg_type == NLMSG_ERROR) | |
387 | { | |
388 | struct nlmsgerr *err = (struct nlmsgerr *) NLMSG_DATA (h); | |
389 | ||
718e3744 | 390 | /* If the error field is zero, then this is an ACK */ |
7021c425 | 391 | if (err->error == 0) |
718e3744 | 392 | { |
7021c425 | 393 | if (IS_ZEBRA_DEBUG_KERNEL) |
394 | { | |
1ada8198 | 395 | zlog_debug ("%s: %s ACK: type=%s(%u), seq=%u, pid=%u", |
7021c425 | 396 | __FUNCTION__, nl->name, |
397 | lookup (nlmsg_str, err->msg.nlmsg_type), | |
398 | err->msg.nlmsg_type, err->msg.nlmsg_seq, | |
399 | err->msg.nlmsg_pid); | |
718e3744 | 400 | } |
7021c425 | 401 | |
402 | /* return if not a multipart message, otherwise continue */ | |
403 | if (!(h->nlmsg_flags & NLM_F_MULTI)) | |
404 | { | |
405 | return 0; | |
718e3744 | 406 | } |
7021c425 | 407 | continue; |
718e3744 | 408 | } |
7021c425 | 409 | |
718e3744 | 410 | if (h->nlmsg_len < NLMSG_LENGTH (sizeof (struct nlmsgerr))) |
7021c425 | 411 | { |
412 | zlog (NULL, LOG_ERR, "%s error: message truncated", | |
413 | nl->name); | |
414 | return -1; | |
415 | } | |
416 | ||
417 | /* Deal with Error Noise - MAG */ | |
418 | { | |
419 | int loglvl = LOG_ERR; | |
420 | int errnum = err->error; | |
421 | int msg_type = err->msg.nlmsg_type; | |
422 | ||
423 | if (nl == &netlink_cmd | |
424 | && (-errnum == ENODEV || -errnum == ESRCH) | |
425 | && (msg_type == RTM_NEWROUTE || msg_type == RTM_DELROUTE)) | |
426 | loglvl = LOG_DEBUG; | |
427 | ||
428 | zlog (NULL, loglvl, "%s error: %s, type=%s(%u), " | |
1ada8198 | 429 | "seq=%u, pid=%u", |
6099b3b5 | 430 | nl->name, safe_strerror (-errnum), |
7021c425 | 431 | lookup (nlmsg_str, msg_type), |
432 | msg_type, err->msg.nlmsg_seq, err->msg.nlmsg_pid); | |
433 | } | |
434 | /* | |
435 | ret = -1; | |
436 | continue; | |
437 | */ | |
438 | return -1; | |
439 | } | |
440 | ||
441 | /* OK we got netlink message. */ | |
442 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1ada8198 | 443 | zlog_debug ("netlink_parse_info: %s type %s(%u), seq=%u, pid=%u", |
7021c425 | 444 | nl->name, |
445 | lookup (nlmsg_str, h->nlmsg_type), h->nlmsg_type, | |
446 | h->nlmsg_seq, h->nlmsg_pid); | |
447 | ||
448 | /* skip unsolicited messages originating from command socket */ | |
449 | if (nl != &netlink_cmd && h->nlmsg_pid == netlink_cmd.snl.nl_pid) | |
450 | { | |
451 | if (IS_ZEBRA_DEBUG_KERNEL) | |
b6178002 | 452 | zlog_debug ("netlink_parse_info: %s packet comes from %s", |
1ada8198 | 453 | netlink_cmd.name, nl->name); |
7021c425 | 454 | continue; |
455 | } | |
456 | ||
457 | error = (*filter) (&snl, h); | |
458 | if (error < 0) | |
459 | { | |
460 | zlog (NULL, LOG_ERR, "%s filter function error", nl->name); | |
461 | ret = error; | |
462 | } | |
463 | } | |
718e3744 | 464 | |
465 | /* After error care. */ | |
466 | if (msg.msg_flags & MSG_TRUNC) | |
7021c425 | 467 | { |
468 | zlog (NULL, LOG_ERR, "%s error: message truncated", nl->name); | |
469 | continue; | |
470 | } | |
718e3744 | 471 | if (status) |
7021c425 | 472 | { |
473 | zlog (NULL, LOG_ERR, "%s error: data remnant size %d", nl->name, | |
474 | status); | |
475 | return -1; | |
476 | } | |
718e3744 | 477 | } |
478 | return ret; | |
479 | } | |
480 | ||
481 | /* Utility function for parse rtattr. */ | |
482 | static void | |
7021c425 | 483 | netlink_parse_rtattr (struct rtattr **tb, int max, struct rtattr *rta, |
484 | int len) | |
718e3744 | 485 | { |
7021c425 | 486 | while (RTA_OK (rta, len)) |
718e3744 | 487 | { |
488 | if (rta->rta_type <= max) | |
7021c425 | 489 | tb[rta->rta_type] = rta; |
490 | rta = RTA_NEXT (rta, len); | |
718e3744 | 491 | } |
492 | } | |
493 | ||
494 | /* Called from interface_lookup_netlink(). This function is only used | |
495 | during bootstrap. */ | |
496 | int | |
497 | netlink_interface (struct sockaddr_nl *snl, struct nlmsghdr *h) | |
498 | { | |
499 | int len; | |
500 | struct ifinfomsg *ifi; | |
501 | struct rtattr *tb[IFLA_MAX + 1]; | |
502 | struct interface *ifp; | |
503 | char *name; | |
504 | int i; | |
505 | ||
506 | ifi = NLMSG_DATA (h); | |
507 | ||
508 | if (h->nlmsg_type != RTM_NEWLINK) | |
509 | return 0; | |
510 | ||
511 | len = h->nlmsg_len - NLMSG_LENGTH (sizeof (struct ifinfomsg)); | |
512 | if (len < 0) | |
513 | return -1; | |
514 | ||
515 | /* Looking up interface name. */ | |
516 | memset (tb, 0, sizeof tb); | |
517 | netlink_parse_rtattr (tb, IFLA_MAX, IFLA_RTA (ifi), len); | |
c15cb242 | 518 | |
1e193152 | 519 | #ifdef IFLA_WIRELESS |
c15cb242 | 520 | /* check for wireless messages to ignore */ |
521 | if ((tb[IFLA_WIRELESS] != NULL) && (ifi->ifi_change == 0)) | |
522 | { | |
523 | if (IS_ZEBRA_DEBUG_KERNEL) | |
524 | zlog_debug ("%s: ignoring IFLA_WIRELESS message", __func__); | |
525 | return 0; | |
526 | } | |
1e193152 | 527 | #endif /* IFLA_WIRELESS */ |
c15cb242 | 528 | |
718e3744 | 529 | if (tb[IFLA_IFNAME] == NULL) |
530 | return -1; | |
7021c425 | 531 | name = (char *) RTA_DATA (tb[IFLA_IFNAME]); |
718e3744 | 532 | |
533 | /* Add interface. */ | |
534 | ifp = if_get_by_name (name); | |
d2fc8896 | 535 | set_ifindex(ifp, ifi->ifi_index); |
718e3744 | 536 | ifp->flags = ifi->ifi_flags & 0x0000fffff; |
44145db3 | 537 | ifp->mtu6 = ifp->mtu = *(int *) RTA_DATA (tb[IFLA_MTU]); |
718e3744 | 538 | ifp->metric = 1; |
539 | ||
540 | /* Hardware type and address. */ | |
541 | ifp->hw_type = ifi->ifi_type; | |
542 | ||
543 | if (tb[IFLA_ADDRESS]) | |
544 | { | |
545 | int hw_addr_len; | |
546 | ||
7021c425 | 547 | hw_addr_len = RTA_PAYLOAD (tb[IFLA_ADDRESS]); |
718e3744 | 548 | |
549 | if (hw_addr_len > INTERFACE_HWADDR_MAX) | |
7021c425 | 550 | zlog_warn ("Hardware address is too large: %d", hw_addr_len); |
718e3744 | 551 | else |
7021c425 | 552 | { |
553 | ifp->hw_addr_len = hw_addr_len; | |
554 | memcpy (ifp->hw_addr, RTA_DATA (tb[IFLA_ADDRESS]), hw_addr_len); | |
555 | ||
556 | for (i = 0; i < hw_addr_len; i++) | |
557 | if (ifp->hw_addr[i] != 0) | |
558 | break; | |
559 | ||
560 | if (i == hw_addr_len) | |
561 | ifp->hw_addr_len = 0; | |
562 | else | |
563 | ifp->hw_addr_len = hw_addr_len; | |
564 | } | |
718e3744 | 565 | } |
566 | ||
567 | if_add_update (ifp); | |
568 | ||
569 | return 0; | |
570 | } | |
571 | ||
572 | /* Lookup interface IPv4/IPv6 address. */ | |
573 | int | |
574 | netlink_interface_addr (struct sockaddr_nl *snl, struct nlmsghdr *h) | |
575 | { | |
576 | int len; | |
577 | struct ifaddrmsg *ifa; | |
7021c425 | 578 | struct rtattr *tb[IFA_MAX + 1]; |
718e3744 | 579 | struct interface *ifp; |
580 | void *addr = NULL; | |
581 | void *broad = NULL; | |
582 | u_char flags = 0; | |
583 | char *label = NULL; | |
584 | ||
585 | ifa = NLMSG_DATA (h); | |
586 | ||
7021c425 | 587 | if (ifa->ifa_family != AF_INET |
718e3744 | 588 | #ifdef HAVE_IPV6 |
589 | && ifa->ifa_family != AF_INET6 | |
590 | #endif /* HAVE_IPV6 */ | |
7021c425 | 591 | ) |
718e3744 | 592 | return 0; |
593 | ||
594 | if (h->nlmsg_type != RTM_NEWADDR && h->nlmsg_type != RTM_DELADDR) | |
595 | return 0; | |
596 | ||
7021c425 | 597 | len = h->nlmsg_len - NLMSG_LENGTH (sizeof (struct ifaddrmsg)); |
718e3744 | 598 | if (len < 0) |
599 | return -1; | |
600 | ||
601 | memset (tb, 0, sizeof tb); | |
602 | netlink_parse_rtattr (tb, IFA_MAX, IFA_RTA (ifa), len); | |
603 | ||
604 | ifp = if_lookup_by_index (ifa->ifa_index); | |
605 | if (ifp == NULL) | |
606 | { | |
607 | zlog_err ("netlink_interface_addr can't find interface by index %d", | |
7021c425 | 608 | ifa->ifa_index); |
718e3744 | 609 | return -1; |
610 | } | |
611 | ||
7021c425 | 612 | if (IS_ZEBRA_DEBUG_KERNEL) /* remove this line to see initial ifcfg */ |
718e3744 | 613 | { |
00df0c1e | 614 | char buf[BUFSIZ]; |
206d8055 | 615 | zlog_debug ("netlink_interface_addr %s %s:", |
616 | lookup (nlmsg_str, h->nlmsg_type), ifp->name); | |
718e3744 | 617 | if (tb[IFA_LOCAL]) |
206d8055 | 618 | zlog_debug (" IFA_LOCAL %s/%d", |
619 | inet_ntop (ifa->ifa_family, RTA_DATA (tb[IFA_LOCAL]), | |
620 | buf, BUFSIZ), ifa->ifa_prefixlen); | |
718e3744 | 621 | if (tb[IFA_ADDRESS]) |
206d8055 | 622 | zlog_debug (" IFA_ADDRESS %s/%d", |
623 | inet_ntop (ifa->ifa_family, RTA_DATA (tb[IFA_ADDRESS]), | |
624 | buf, BUFSIZ), ifa->ifa_prefixlen); | |
718e3744 | 625 | if (tb[IFA_BROADCAST]) |
206d8055 | 626 | zlog_debug (" IFA_BROADCAST %s/%d", |
627 | inet_ntop (ifa->ifa_family, RTA_DATA (tb[IFA_BROADCAST]), | |
628 | buf, BUFSIZ), ifa->ifa_prefixlen); | |
00df0c1e | 629 | if (tb[IFA_LABEL] && strcmp (ifp->name, RTA_DATA (tb[IFA_LABEL]))) |
b6178002 | 630 | zlog_debug (" IFA_LABEL %s", (char *)RTA_DATA (tb[IFA_LABEL])); |
718e3744 | 631 | } |
31a476c7 | 632 | |
633 | if (tb[IFA_ADDRESS] == NULL) | |
634 | tb[IFA_ADDRESS] = tb[IFA_LOCAL]; | |
635 | ||
636 | if (ifp->flags & IFF_POINTOPOINT) | |
7021c425 | 637 | { |
31a476c7 | 638 | if (tb[IFA_LOCAL]) |
639 | { | |
640 | addr = RTA_DATA (tb[IFA_LOCAL]); | |
3fb9cd6e | 641 | if (tb[IFA_ADDRESS] && |
642 | memcmp(RTA_DATA(tb[IFA_ADDRESS]),RTA_DATA(tb[IFA_LOCAL]),4)) | |
643 | /* if IFA_ADDRESS != IFA_LOCAL, then it's the peer address */ | |
31a476c7 | 644 | broad = RTA_DATA (tb[IFA_ADDRESS]); |
645 | else | |
646 | broad = NULL; | |
647 | } | |
648 | else | |
649 | { | |
650 | if (tb[IFA_ADDRESS]) | |
651 | addr = RTA_DATA (tb[IFA_ADDRESS]); | |
652 | else | |
653 | addr = NULL; | |
654 | } | |
7021c425 | 655 | } |
31a476c7 | 656 | else |
7021c425 | 657 | { |
31a476c7 | 658 | if (tb[IFA_ADDRESS]) |
659 | addr = RTA_DATA (tb[IFA_ADDRESS]); | |
660 | else | |
661 | addr = NULL; | |
662 | ||
663 | if (tb[IFA_BROADCAST]) | |
664 | broad = RTA_DATA(tb[IFA_BROADCAST]); | |
665 | else | |
666 | broad = NULL; | |
7021c425 | 667 | } |
00df0c1e | 668 | |
718e3744 | 669 | /* Flags. */ |
670 | if (ifa->ifa_flags & IFA_F_SECONDARY) | |
671 | SET_FLAG (flags, ZEBRA_IFA_SECONDARY); | |
672 | ||
673 | /* Label */ | |
674 | if (tb[IFA_LABEL]) | |
675 | label = (char *) RTA_DATA (tb[IFA_LABEL]); | |
676 | ||
677 | if (ifp && label && strcmp (ifp->name, label) == 0) | |
678 | label = NULL; | |
679 | ||
680 | /* Register interface address to the interface. */ | |
681 | if (ifa->ifa_family == AF_INET) | |
682 | { | |
7021c425 | 683 | if (h->nlmsg_type == RTM_NEWADDR) |
684 | connected_add_ipv4 (ifp, flags, | |
685 | (struct in_addr *) addr, ifa->ifa_prefixlen, | |
686 | (struct in_addr *) broad, label); | |
687 | else | |
688 | connected_delete_ipv4 (ifp, flags, | |
689 | (struct in_addr *) addr, ifa->ifa_prefixlen, | |
0752ef0b | 690 | (struct in_addr *) broad); |
718e3744 | 691 | } |
692 | #ifdef HAVE_IPV6 | |
693 | if (ifa->ifa_family == AF_INET6) | |
694 | { | |
695 | if (h->nlmsg_type == RTM_NEWADDR) | |
7021c425 | 696 | connected_add_ipv6 (ifp, |
697 | (struct in6_addr *) addr, ifa->ifa_prefixlen, | |
0752ef0b | 698 | (struct in6_addr *) broad, label); |
718e3744 | 699 | else |
7021c425 | 700 | connected_delete_ipv6 (ifp, |
701 | (struct in6_addr *) addr, ifa->ifa_prefixlen, | |
702 | (struct in6_addr *) broad); | |
718e3744 | 703 | } |
7021c425 | 704 | #endif /* HAVE_IPV6 */ |
718e3744 | 705 | |
706 | return 0; | |
707 | } | |
708 | ||
709 | /* Looking up routing table by netlink interface. */ | |
710 | int | |
711 | netlink_routing_table (struct sockaddr_nl *snl, struct nlmsghdr *h) | |
712 | { | |
713 | int len; | |
714 | struct rtmsg *rtm; | |
7021c425 | 715 | struct rtattr *tb[RTA_MAX + 1]; |
718e3744 | 716 | u_char flags = 0; |
7021c425 | 717 | |
718 | char anyaddr[16] = { 0 }; | |
718e3744 | 719 | |
720 | int index; | |
721 | int table; | |
34195bf6 | 722 | int metric; |
723 | ||
718e3744 | 724 | void *dest; |
725 | void *gate; | |
726 | ||
727 | rtm = NLMSG_DATA (h); | |
728 | ||
729 | if (h->nlmsg_type != RTM_NEWROUTE) | |
730 | return 0; | |
731 | if (rtm->rtm_type != RTN_UNICAST) | |
732 | return 0; | |
733 | ||
734 | table = rtm->rtm_table; | |
7021c425 | 735 | #if 0 /* we weed them out later in rib_weed_tables () */ |
b21b19c5 | 736 | if (table != RT_TABLE_MAIN && table != zebrad.rtm_table_default) |
718e3744 | 737 | return 0; |
738 | #endif | |
739 | ||
7021c425 | 740 | len = h->nlmsg_len - NLMSG_LENGTH (sizeof (struct rtmsg)); |
718e3744 | 741 | if (len < 0) |
742 | return -1; | |
743 | ||
744 | memset (tb, 0, sizeof tb); | |
745 | netlink_parse_rtattr (tb, RTA_MAX, RTM_RTA (rtm), len); | |
746 | ||
747 | if (rtm->rtm_flags & RTM_F_CLONED) | |
748 | return 0; | |
749 | if (rtm->rtm_protocol == RTPROT_REDIRECT) | |
750 | return 0; | |
751 | if (rtm->rtm_protocol == RTPROT_KERNEL) | |
752 | return 0; | |
753 | ||
754 | if (rtm->rtm_src_len != 0) | |
755 | return 0; | |
756 | ||
757 | /* Route which inserted by Zebra. */ | |
758 | if (rtm->rtm_protocol == RTPROT_ZEBRA) | |
759 | flags |= ZEBRA_FLAG_SELFROUTE; | |
7021c425 | 760 | |
718e3744 | 761 | index = 0; |
34195bf6 | 762 | metric = 0; |
718e3744 | 763 | dest = NULL; |
764 | gate = NULL; | |
765 | ||
766 | if (tb[RTA_OIF]) | |
767 | index = *(int *) RTA_DATA (tb[RTA_OIF]); | |
768 | ||
769 | if (tb[RTA_DST]) | |
770 | dest = RTA_DATA (tb[RTA_DST]); | |
771 | else | |
772 | dest = anyaddr; | |
773 | ||
774 | /* Multipath treatment is needed. */ | |
775 | if (tb[RTA_GATEWAY]) | |
776 | gate = RTA_DATA (tb[RTA_GATEWAY]); | |
777 | ||
34195bf6 | 778 | if (tb[RTA_PRIORITY]) |
779 | metric = *(int *) RTA_DATA(tb[RTA_PRIORITY]); | |
780 | ||
718e3744 | 781 | if (rtm->rtm_family == AF_INET) |
782 | { | |
783 | struct prefix_ipv4 p; | |
784 | p.family = AF_INET; | |
785 | memcpy (&p.prefix, dest, 4); | |
786 | p.prefixlen = rtm->rtm_dst_len; | |
787 | ||
34195bf6 | 788 | rib_add_ipv4 (ZEBRA_ROUTE_KERNEL, flags, &p, gate, index, table, metric, 0); |
718e3744 | 789 | } |
790 | #ifdef HAVE_IPV6 | |
791 | if (rtm->rtm_family == AF_INET6) | |
792 | { | |
793 | struct prefix_ipv6 p; | |
794 | p.family = AF_INET6; | |
795 | memcpy (&p.prefix, dest, 16); | |
796 | p.prefixlen = rtm->rtm_dst_len; | |
797 | ||
be61c4eb | 798 | rib_add_ipv6 (ZEBRA_ROUTE_KERNEL, flags, &p, gate, index, table, |
799 | metric, 0); | |
718e3744 | 800 | } |
801 | #endif /* HAVE_IPV6 */ | |
802 | ||
803 | return 0; | |
804 | } | |
805 | ||
7021c425 | 806 | struct message rtproto_str[] = { |
718e3744 | 807 | {RTPROT_REDIRECT, "redirect"}, |
808 | {RTPROT_KERNEL, "kernel"}, | |
809 | {RTPROT_BOOT, "boot"}, | |
810 | {RTPROT_STATIC, "static"}, | |
811 | {RTPROT_GATED, "GateD"}, | |
812 | {RTPROT_RA, "router advertisement"}, | |
813 | {RTPROT_MRT, "MRT"}, | |
814 | {RTPROT_ZEBRA, "Zebra"}, | |
815 | #ifdef RTPROT_BIRD | |
816 | {RTPROT_BIRD, "BIRD"}, | |
817 | #endif /* RTPROT_BIRD */ | |
818 | {0, NULL} | |
819 | }; | |
820 | ||
821 | /* Routing information change from the kernel. */ | |
822 | int | |
823 | netlink_route_change (struct sockaddr_nl *snl, struct nlmsghdr *h) | |
824 | { | |
825 | int len; | |
826 | struct rtmsg *rtm; | |
7021c425 | 827 | struct rtattr *tb[RTA_MAX + 1]; |
828 | ||
829 | char anyaddr[16] = { 0 }; | |
718e3744 | 830 | |
831 | int index; | |
832 | int table; | |
833 | void *dest; | |
834 | void *gate; | |
835 | ||
836 | rtm = NLMSG_DATA (h); | |
837 | ||
7021c425 | 838 | if (!(h->nlmsg_type == RTM_NEWROUTE || h->nlmsg_type == RTM_DELROUTE)) |
718e3744 | 839 | { |
840 | /* If this is not route add/delete message print warning. */ | |
841 | zlog_warn ("Kernel message: %d\n", h->nlmsg_type); | |
842 | return 0; | |
843 | } | |
844 | ||
845 | /* Connected route. */ | |
846 | if (IS_ZEBRA_DEBUG_KERNEL) | |
b6178002 | 847 | zlog_debug ("%s %s %s proto %s", |
7021c425 | 848 | h->nlmsg_type == |
849 | RTM_NEWROUTE ? "RTM_NEWROUTE" : "RTM_DELROUTE", | |
850 | rtm->rtm_family == AF_INET ? "ipv4" : "ipv6", | |
851 | rtm->rtm_type == RTN_UNICAST ? "unicast" : "multicast", | |
852 | lookup (rtproto_str, rtm->rtm_protocol)); | |
718e3744 | 853 | |
854 | if (rtm->rtm_type != RTN_UNICAST) | |
855 | { | |
856 | return 0; | |
857 | } | |
858 | ||
859 | table = rtm->rtm_table; | |
b21b19c5 | 860 | if (table != RT_TABLE_MAIN && table != zebrad.rtm_table_default) |
718e3744 | 861 | { |
862 | return 0; | |
863 | } | |
864 | ||
7021c425 | 865 | len = h->nlmsg_len - NLMSG_LENGTH (sizeof (struct rtmsg)); |
718e3744 | 866 | if (len < 0) |
867 | return -1; | |
868 | ||
869 | memset (tb, 0, sizeof tb); | |
870 | netlink_parse_rtattr (tb, RTA_MAX, RTM_RTA (rtm), len); | |
871 | ||
872 | if (rtm->rtm_flags & RTM_F_CLONED) | |
873 | return 0; | |
874 | if (rtm->rtm_protocol == RTPROT_REDIRECT) | |
875 | return 0; | |
876 | if (rtm->rtm_protocol == RTPROT_KERNEL) | |
877 | return 0; | |
878 | ||
879 | if (rtm->rtm_protocol == RTPROT_ZEBRA && h->nlmsg_type == RTM_NEWROUTE) | |
880 | return 0; | |
881 | ||
882 | if (rtm->rtm_src_len != 0) | |
883 | { | |
884 | zlog_warn ("netlink_route_change(): no src len"); | |
885 | return 0; | |
886 | } | |
7021c425 | 887 | |
718e3744 | 888 | index = 0; |
889 | dest = NULL; | |
890 | gate = NULL; | |
891 | ||
892 | if (tb[RTA_OIF]) | |
893 | index = *(int *) RTA_DATA (tb[RTA_OIF]); | |
894 | ||
895 | if (tb[RTA_DST]) | |
896 | dest = RTA_DATA (tb[RTA_DST]); | |
897 | else | |
898 | dest = anyaddr; | |
899 | ||
900 | if (tb[RTA_GATEWAY]) | |
901 | gate = RTA_DATA (tb[RTA_GATEWAY]); | |
902 | ||
903 | if (rtm->rtm_family == AF_INET) | |
904 | { | |
905 | struct prefix_ipv4 p; | |
906 | p.family = AF_INET; | |
907 | memcpy (&p.prefix, dest, 4); | |
908 | p.prefixlen = rtm->rtm_dst_len; | |
909 | ||
910 | if (IS_ZEBRA_DEBUG_KERNEL) | |
7021c425 | 911 | { |
912 | if (h->nlmsg_type == RTM_NEWROUTE) | |
b6178002 | 913 | zlog_debug ("RTM_NEWROUTE %s/%d", |
7021c425 | 914 | inet_ntoa (p.prefix), p.prefixlen); |
915 | else | |
b6178002 | 916 | zlog_debug ("RTM_DELROUTE %s/%d", |
7021c425 | 917 | inet_ntoa (p.prefix), p.prefixlen); |
918 | } | |
718e3744 | 919 | |
920 | if (h->nlmsg_type == RTM_NEWROUTE) | |
7021c425 | 921 | rib_add_ipv4 (ZEBRA_ROUTE_KERNEL, 0, &p, gate, index, table, 0, 0); |
718e3744 | 922 | else |
7021c425 | 923 | rib_delete_ipv4 (ZEBRA_ROUTE_KERNEL, 0, &p, gate, index, table); |
718e3744 | 924 | } |
925 | ||
926 | #ifdef HAVE_IPV6 | |
927 | if (rtm->rtm_family == AF_INET6) | |
928 | { | |
929 | struct prefix_ipv6 p; | |
930 | char buf[BUFSIZ]; | |
931 | ||
932 | p.family = AF_INET6; | |
933 | memcpy (&p.prefix, dest, 16); | |
934 | p.prefixlen = rtm->rtm_dst_len; | |
935 | ||
936 | if (IS_ZEBRA_DEBUG_KERNEL) | |
7021c425 | 937 | { |
938 | if (h->nlmsg_type == RTM_NEWROUTE) | |
b6178002 | 939 | zlog_debug ("RTM_NEWROUTE %s/%d", |
7021c425 | 940 | inet_ntop (AF_INET6, &p.prefix, buf, BUFSIZ), |
941 | p.prefixlen); | |
942 | else | |
b6178002 | 943 | zlog_debug ("RTM_DELROUTE %s/%d", |
7021c425 | 944 | inet_ntop (AF_INET6, &p.prefix, buf, BUFSIZ), |
945 | p.prefixlen); | |
946 | } | |
718e3744 | 947 | |
948 | if (h->nlmsg_type == RTM_NEWROUTE) | |
be61c4eb | 949 | rib_add_ipv6 (ZEBRA_ROUTE_KERNEL, 0, &p, gate, index, 0, 0, 0); |
718e3744 | 950 | else |
7021c425 | 951 | rib_delete_ipv6 (ZEBRA_ROUTE_KERNEL, 0, &p, gate, index, 0); |
718e3744 | 952 | } |
953 | #endif /* HAVE_IPV6 */ | |
954 | ||
955 | return 0; | |
956 | } | |
957 | ||
958 | int | |
959 | netlink_link_change (struct sockaddr_nl *snl, struct nlmsghdr *h) | |
960 | { | |
961 | int len; | |
962 | struct ifinfomsg *ifi; | |
7021c425 | 963 | struct rtattr *tb[IFLA_MAX + 1]; |
718e3744 | 964 | struct interface *ifp; |
965 | char *name; | |
966 | ||
967 | ifi = NLMSG_DATA (h); | |
968 | ||
7021c425 | 969 | if (!(h->nlmsg_type == RTM_NEWLINK || h->nlmsg_type == RTM_DELLINK)) |
718e3744 | 970 | { |
971 | /* If this is not link add/delete message so print warning. */ | |
972 | zlog_warn ("netlink_link_change: wrong kernel message %d\n", | |
7021c425 | 973 | h->nlmsg_type); |
718e3744 | 974 | return 0; |
975 | } | |
976 | ||
977 | len = h->nlmsg_len - NLMSG_LENGTH (sizeof (struct ifinfomsg)); | |
978 | if (len < 0) | |
979 | return -1; | |
980 | ||
981 | /* Looking up interface name. */ | |
982 | memset (tb, 0, sizeof tb); | |
983 | netlink_parse_rtattr (tb, IFLA_MAX, IFLA_RTA (ifi), len); | |
c15cb242 | 984 | |
1e193152 | 985 | #ifdef IFLA_WIRELESS |
c15cb242 | 986 | /* check for wireless messages to ignore */ |
987 | if ((tb[IFLA_WIRELESS] != NULL) && (ifi->ifi_change == 0)) | |
988 | { | |
989 | if (IS_ZEBRA_DEBUG_KERNEL) | |
990 | zlog_debug ("%s: ignoring IFLA_WIRELESS message", __func__); | |
991 | return 0; | |
992 | } | |
1e193152 | 993 | #endif /* IFLA_WIRELESS */ |
c15cb242 | 994 | |
718e3744 | 995 | if (tb[IFLA_IFNAME] == NULL) |
996 | return -1; | |
7021c425 | 997 | name = (char *) RTA_DATA (tb[IFLA_IFNAME]); |
718e3744 | 998 | |
999 | /* Add interface. */ | |
1000 | if (h->nlmsg_type == RTM_NEWLINK) | |
1001 | { | |
1002 | ifp = if_lookup_by_name (name); | |
1003 | ||
7021c425 | 1004 | if (ifp == NULL || !CHECK_FLAG (ifp->status, ZEBRA_INTERFACE_ACTIVE)) |
1005 | { | |
1006 | if (ifp == NULL) | |
1007 | ifp = if_get_by_name (name); | |
718e3744 | 1008 | |
d2fc8896 | 1009 | set_ifindex(ifp, ifi->ifi_index); |
7021c425 | 1010 | ifp->flags = ifi->ifi_flags & 0x0000fffff; |
44145db3 | 1011 | ifp->mtu6 = ifp->mtu = *(int *) RTA_DATA (tb[IFLA_MTU]); |
7021c425 | 1012 | ifp->metric = 1; |
718e3744 | 1013 | |
7021c425 | 1014 | /* If new link is added. */ |
1015 | if_add_update (ifp); | |
1016 | } | |
718e3744 | 1017 | else |
7021c425 | 1018 | { |
1019 | /* Interface status change. */ | |
d2fc8896 | 1020 | set_ifindex(ifp, ifi->ifi_index); |
44145db3 | 1021 | ifp->mtu6 = ifp->mtu = *(int *) RTA_DATA (tb[IFLA_MTU]); |
7021c425 | 1022 | ifp->metric = 1; |
1023 | ||
1024 | if (if_is_operative (ifp)) | |
1025 | { | |
1026 | ifp->flags = ifi->ifi_flags & 0x0000fffff; | |
1027 | if (!if_is_operative (ifp)) | |
1028 | if_down (ifp); | |
a608bbf2 | 1029 | else |
1030 | /* Must notify client daemons of new interface status. */ | |
1031 | zebra_interface_up_update (ifp); | |
7021c425 | 1032 | } |
1033 | else | |
1034 | { | |
1035 | ifp->flags = ifi->ifi_flags & 0x0000fffff; | |
1036 | if (if_is_operative (ifp)) | |
1037 | if_up (ifp); | |
1038 | } | |
1039 | } | |
718e3744 | 1040 | } |
1041 | else | |
1042 | { | |
1043 | /* RTM_DELLINK. */ | |
1044 | ifp = if_lookup_by_name (name); | |
1045 | ||
1046 | if (ifp == NULL) | |
7021c425 | 1047 | { |
1048 | zlog (NULL, LOG_WARNING, "interface %s is deleted but can't find", | |
718e3744 | 1049 | name); |
7021c425 | 1050 | return 0; |
1051 | } | |
1052 | ||
718e3744 | 1053 | if_delete_update (ifp); |
1054 | } | |
1055 | ||
1056 | return 0; | |
1057 | } | |
1058 | ||
1059 | int | |
1060 | netlink_information_fetch (struct sockaddr_nl *snl, struct nlmsghdr *h) | |
1061 | { | |
1062 | switch (h->nlmsg_type) | |
1063 | { | |
1064 | case RTM_NEWROUTE: | |
1065 | return netlink_route_change (snl, h); | |
1066 | break; | |
1067 | case RTM_DELROUTE: | |
1068 | return netlink_route_change (snl, h); | |
1069 | break; | |
1070 | case RTM_NEWLINK: | |
1071 | return netlink_link_change (snl, h); | |
1072 | break; | |
1073 | case RTM_DELLINK: | |
1074 | return netlink_link_change (snl, h); | |
1075 | break; | |
1076 | case RTM_NEWADDR: | |
1077 | return netlink_interface_addr (snl, h); | |
1078 | break; | |
1079 | case RTM_DELADDR: | |
1080 | return netlink_interface_addr (snl, h); | |
1081 | break; | |
1082 | default: | |
1083 | zlog_warn ("Unknown netlink nlmsg_type %d\n", h->nlmsg_type); | |
1084 | break; | |
1085 | } | |
1086 | return 0; | |
1087 | } | |
1088 | ||
1089 | /* Interface lookup by netlink socket. */ | |
1090 | int | |
6621ca86 | 1091 | interface_lookup_netlink (void) |
718e3744 | 1092 | { |
1093 | int ret; | |
5f37d86f | 1094 | int flags; |
1095 | int snb_ret; | |
7021c425 | 1096 | |
5f37d86f | 1097 | /* |
1098 | * Change netlink socket flags to blocking to ensure we get | |
1099 | * a reply via nelink_parse_info | |
7021c425 | 1100 | */ |
1101 | snb_ret = set_netlink_blocking (&netlink_cmd, &flags); | |
1102 | if (snb_ret < 0) | |
1103 | zlog (NULL, LOG_WARNING, | |
1104 | "%s:%i Warning: Could not set netlink socket to blocking.", | |
1105 | __FUNCTION__, __LINE__); | |
1106 | ||
718e3744 | 1107 | /* Get interface information. */ |
1108 | ret = netlink_request (AF_PACKET, RTM_GETLINK, &netlink_cmd); | |
1109 | if (ret < 0) | |
1110 | return ret; | |
1111 | ret = netlink_parse_info (netlink_interface, &netlink_cmd); | |
1112 | if (ret < 0) | |
1113 | return ret; | |
1114 | ||
1115 | /* Get IPv4 address of the interfaces. */ | |
1116 | ret = netlink_request (AF_INET, RTM_GETADDR, &netlink_cmd); | |
1117 | if (ret < 0) | |
1118 | return ret; | |
1119 | ret = netlink_parse_info (netlink_interface_addr, &netlink_cmd); | |
1120 | if (ret < 0) | |
1121 | return ret; | |
1122 | ||
1123 | #ifdef HAVE_IPV6 | |
1124 | /* Get IPv6 address of the interfaces. */ | |
1125 | ret = netlink_request (AF_INET6, RTM_GETADDR, &netlink_cmd); | |
1126 | if (ret < 0) | |
1127 | return ret; | |
1128 | ret = netlink_parse_info (netlink_interface_addr, &netlink_cmd); | |
1129 | if (ret < 0) | |
1130 | return ret; | |
1131 | #endif /* HAVE_IPV6 */ | |
1132 | ||
7021c425 | 1133 | /* restore socket flags */ |
1134 | if (snb_ret == 0) | |
1135 | set_netlink_nonblocking (&netlink_cmd, &flags); | |
718e3744 | 1136 | return 0; |
1137 | } | |
1138 | ||
1139 | /* Routing table read function using netlink interface. Only called | |
1140 | bootstrap time. */ | |
1141 | int | |
6621ca86 | 1142 | netlink_route_read (void) |
718e3744 | 1143 | { |
1144 | int ret; | |
5f37d86f | 1145 | int flags; |
1146 | int snb_ret; | |
7021c425 | 1147 | |
5f37d86f | 1148 | /* |
1149 | * Change netlink socket flags to blocking to ensure we get | |
1150 | * a reply via nelink_parse_info | |
7021c425 | 1151 | */ |
1152 | snb_ret = set_netlink_blocking (&netlink_cmd, &flags); | |
1153 | if (snb_ret < 0) | |
1154 | zlog (NULL, LOG_WARNING, | |
1155 | "%s:%i Warning: Could not set netlink socket to blocking.", | |
1156 | __FUNCTION__, __LINE__); | |
1157 | ||
718e3744 | 1158 | /* Get IPv4 routing table. */ |
1159 | ret = netlink_request (AF_INET, RTM_GETROUTE, &netlink_cmd); | |
1160 | if (ret < 0) | |
1161 | return ret; | |
1162 | ret = netlink_parse_info (netlink_routing_table, &netlink_cmd); | |
1163 | if (ret < 0) | |
1164 | return ret; | |
1165 | ||
1166 | #ifdef HAVE_IPV6 | |
1167 | /* Get IPv6 routing table. */ | |
1168 | ret = netlink_request (AF_INET6, RTM_GETROUTE, &netlink_cmd); | |
1169 | if (ret < 0) | |
1170 | return ret; | |
1171 | ret = netlink_parse_info (netlink_routing_table, &netlink_cmd); | |
1172 | if (ret < 0) | |
1173 | return ret; | |
1174 | #endif /* HAVE_IPV6 */ | |
1175 | ||
5f37d86f | 1176 | /* restore flags */ |
7021c425 | 1177 | if (snb_ret == 0) |
1178 | set_netlink_nonblocking (&netlink_cmd, &flags); | |
718e3744 | 1179 | return 0; |
1180 | } | |
1181 | ||
1182 | /* Utility function comes from iproute2. | |
1183 | Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> */ | |
1184 | int | |
1185 | addattr_l (struct nlmsghdr *n, int maxlen, int type, void *data, int alen) | |
1186 | { | |
1187 | int len; | |
1188 | struct rtattr *rta; | |
1189 | ||
7021c425 | 1190 | len = RTA_LENGTH (alen); |
718e3744 | 1191 | |
7021c425 | 1192 | if (NLMSG_ALIGN (n->nlmsg_len) + len > maxlen) |
718e3744 | 1193 | return -1; |
1194 | ||
7021c425 | 1195 | rta = (struct rtattr *) (((char *) n) + NLMSG_ALIGN (n->nlmsg_len)); |
718e3744 | 1196 | rta->rta_type = type; |
1197 | rta->rta_len = len; | |
7021c425 | 1198 | memcpy (RTA_DATA (rta), data, alen); |
718e3744 | 1199 | n->nlmsg_len = NLMSG_ALIGN (n->nlmsg_len) + len; |
1200 | ||
1201 | return 0; | |
1202 | } | |
1203 | ||
1204 | int | |
1205 | rta_addattr_l (struct rtattr *rta, int maxlen, int type, void *data, int alen) | |
1206 | { | |
1207 | int len; | |
1208 | struct rtattr *subrta; | |
1209 | ||
7021c425 | 1210 | len = RTA_LENGTH (alen); |
718e3744 | 1211 | |
7021c425 | 1212 | if (RTA_ALIGN (rta->rta_len) + len > maxlen) |
718e3744 | 1213 | return -1; |
1214 | ||
7021c425 | 1215 | subrta = (struct rtattr *) (((char *) rta) + RTA_ALIGN (rta->rta_len)); |
718e3744 | 1216 | subrta->rta_type = type; |
1217 | subrta->rta_len = len; | |
7021c425 | 1218 | memcpy (RTA_DATA (subrta), data, alen); |
718e3744 | 1219 | rta->rta_len = NLMSG_ALIGN (rta->rta_len) + len; |
1220 | ||
1221 | return 0; | |
1222 | } | |
1223 | ||
1224 | /* Utility function comes from iproute2. | |
1225 | Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> */ | |
1226 | int | |
1227 | addattr32 (struct nlmsghdr *n, int maxlen, int type, int data) | |
1228 | { | |
1229 | int len; | |
1230 | struct rtattr *rta; | |
7021c425 | 1231 | |
1232 | len = RTA_LENGTH (4); | |
1233 | ||
718e3744 | 1234 | if (NLMSG_ALIGN (n->nlmsg_len) + len > maxlen) |
1235 | return -1; | |
1236 | ||
7021c425 | 1237 | rta = (struct rtattr *) (((char *) n) + NLMSG_ALIGN (n->nlmsg_len)); |
718e3744 | 1238 | rta->rta_type = type; |
1239 | rta->rta_len = len; | |
7021c425 | 1240 | memcpy (RTA_DATA (rta), &data, 4); |
718e3744 | 1241 | n->nlmsg_len = NLMSG_ALIGN (n->nlmsg_len) + len; |
1242 | ||
1243 | return 0; | |
1244 | } | |
1245 | ||
1246 | static int | |
1247 | netlink_talk_filter (struct sockaddr_nl *snl, struct nlmsghdr *h) | |
1248 | { | |
b7ed1ec7 | 1249 | zlog_warn ("netlink_talk: ignoring message type 0x%04x", h->nlmsg_type); |
718e3744 | 1250 | return 0; |
1251 | } | |
1252 | ||
1253 | /* sendmsg() to netlink socket then recvmsg(). */ | |
1254 | int | |
1255 | netlink_talk (struct nlmsghdr *n, struct nlsock *nl) | |
1256 | { | |
1257 | int status; | |
1258 | struct sockaddr_nl snl; | |
7021c425 | 1259 | struct iovec iov = { (void *) n, n->nlmsg_len }; |
1260 | struct msghdr msg = { (void *) &snl, sizeof snl, &iov, 1, NULL, 0, 0 }; | |
718e3744 | 1261 | int flags = 0; |
5f37d86f | 1262 | int snb_ret; |
4be019d5 | 1263 | int save_errno; |
7021c425 | 1264 | |
718e3744 | 1265 | memset (&snl, 0, sizeof snl); |
1266 | snl.nl_family = AF_NETLINK; | |
7021c425 | 1267 | |
b7ed1ec7 | 1268 | n->nlmsg_seq = ++nl->seq; |
718e3744 | 1269 | |
1270 | /* Request an acknowledgement by setting NLM_F_ACK */ | |
1271 | n->nlmsg_flags |= NLM_F_ACK; | |
7021c425 | 1272 | |
1273 | if (IS_ZEBRA_DEBUG_KERNEL) | |
b7ed1ec7 | 1274 | zlog_debug ("netlink_talk: %s type %s(%u), seq=%u", nl->name, |
7021c425 | 1275 | lookup (nlmsg_str, n->nlmsg_type), n->nlmsg_type, |
1276 | n->nlmsg_seq); | |
718e3744 | 1277 | |
1278 | /* Send message to netlink interface. */ | |
7021c425 | 1279 | if (zserv_privs.change (ZPRIVS_RAISE)) |
1280 | zlog (NULL, LOG_ERR, "Can't raise privileges"); | |
718e3744 | 1281 | status = sendmsg (nl->sock, &msg, 0); |
4be019d5 | 1282 | save_errno = errno; |
7021c425 | 1283 | if (zserv_privs.change (ZPRIVS_LOWER)) |
1284 | zlog (NULL, LOG_ERR, "Can't lower privileges"); | |
1285 | ||
718e3744 | 1286 | if (status < 0) |
1287 | { | |
1288 | zlog (NULL, LOG_ERR, "netlink_talk sendmsg() error: %s", | |
4be019d5 | 1289 | safe_strerror (save_errno)); |
718e3744 | 1290 | return -1; |
1291 | } | |
7021c425 | 1292 | |
718e3744 | 1293 | /* |
1294 | * Change socket flags for blocking I/O. | |
1295 | * This ensures we wait for a reply in netlink_parse_info(). | |
1296 | */ | |
7021c425 | 1297 | snb_ret = set_netlink_blocking (nl, &flags); |
1298 | if (snb_ret < 0) | |
1299 | zlog (NULL, LOG_WARNING, | |
1300 | "%s:%i Warning: Could not set netlink socket to blocking.", | |
1301 | __FUNCTION__, __LINE__); | |
718e3744 | 1302 | |
1303 | /* | |
1304 | * Get reply from netlink socket. | |
1305 | * The reply should either be an acknowlegement or an error. | |
1306 | */ | |
1307 | status = netlink_parse_info (netlink_talk_filter, nl); | |
7021c425 | 1308 | |
718e3744 | 1309 | /* Restore socket flags for nonblocking I/O */ |
7021c425 | 1310 | if (snb_ret == 0) |
1311 | set_netlink_nonblocking (nl, &flags); | |
1312 | ||
718e3744 | 1313 | return status; |
1314 | } | |
1315 | ||
1316 | /* Routing table change via netlink interface. */ | |
1317 | int | |
1318 | netlink_route (int cmd, int family, void *dest, int length, void *gate, | |
7021c425 | 1319 | int index, int zebra_flags, int table) |
718e3744 | 1320 | { |
1321 | int ret; | |
1322 | int bytelen; | |
1323 | struct sockaddr_nl snl; | |
1324 | int discard; | |
1325 | ||
7021c425 | 1326 | struct |
718e3744 | 1327 | { |
1328 | struct nlmsghdr n; | |
1329 | struct rtmsg r; | |
1330 | char buf[1024]; | |
1331 | } req; | |
1332 | ||
1333 | memset (&req, 0, sizeof req); | |
1334 | ||
1335 | bytelen = (family == AF_INET ? 4 : 16); | |
1336 | ||
1337 | req.n.nlmsg_len = NLMSG_LENGTH (sizeof (struct rtmsg)); | |
1338 | req.n.nlmsg_flags = NLM_F_CREATE | NLM_F_REQUEST; | |
1339 | req.n.nlmsg_type = cmd; | |
1340 | req.r.rtm_family = family; | |
1341 | req.r.rtm_table = table; | |
1342 | req.r.rtm_dst_len = length; | |
1343 | ||
81dfcaa2 | 1344 | if ((zebra_flags & ZEBRA_FLAG_BLACKHOLE) |
1345 | || (zebra_flags & ZEBRA_FLAG_REJECT)) | |
718e3744 | 1346 | discard = 1; |
1347 | else | |
1348 | discard = 0; | |
1349 | ||
7021c425 | 1350 | if (cmd == RTM_NEWROUTE) |
718e3744 | 1351 | { |
1352 | req.r.rtm_protocol = RTPROT_ZEBRA; | |
1353 | req.r.rtm_scope = RT_SCOPE_UNIVERSE; | |
1354 | ||
7021c425 | 1355 | if (discard) |
595db7f1 | 1356 | { |
1357 | if (zebra_flags & ZEBRA_FLAG_BLACKHOLE) | |
1358 | req.r.rtm_type = RTN_BLACKHOLE; | |
1359 | else if (zebra_flags & ZEBRA_FLAG_REJECT) | |
1360 | req.r.rtm_type = RTN_UNREACHABLE; | |
7021c425 | 1361 | else |
1362 | assert (RTN_BLACKHOLE != RTN_UNREACHABLE); /* false */ | |
1363 | } | |
595db7f1 | 1364 | else |
7021c425 | 1365 | req.r.rtm_type = RTN_UNICAST; |
718e3744 | 1366 | } |
1367 | ||
1368 | if (dest) | |
1369 | addattr_l (&req.n, sizeof req, RTA_DST, dest, bytelen); | |
1370 | ||
7021c425 | 1371 | if (!discard) |
718e3744 | 1372 | { |
1373 | if (gate) | |
7021c425 | 1374 | addattr_l (&req.n, sizeof req, RTA_GATEWAY, gate, bytelen); |
718e3744 | 1375 | if (index > 0) |
7021c425 | 1376 | addattr32 (&req.n, sizeof req, RTA_OIF, index); |
718e3744 | 1377 | } |
1378 | ||
1379 | /* Destination netlink address. */ | |
1380 | memset (&snl, 0, sizeof snl); | |
1381 | snl.nl_family = AF_NETLINK; | |
1382 | ||
1383 | /* Talk to netlink socket. */ | |
b7ed1ec7 | 1384 | ret = netlink_talk (&req.n, &netlink_cmd); |
718e3744 | 1385 | if (ret < 0) |
1386 | return -1; | |
1387 | ||
1388 | return 0; | |
1389 | } | |
1390 | ||
1391 | /* Routing table change via netlink interface. */ | |
1392 | int | |
1393 | netlink_route_multipath (int cmd, struct prefix *p, struct rib *rib, | |
7021c425 | 1394 | int family) |
718e3744 | 1395 | { |
1396 | int bytelen; | |
1397 | struct sockaddr_nl snl; | |
1398 | struct nexthop *nexthop = NULL; | |
1399 | int nexthop_num = 0; | |
718e3744 | 1400 | int discard; |
1401 | ||
7021c425 | 1402 | struct |
718e3744 | 1403 | { |
1404 | struct nlmsghdr n; | |
1405 | struct rtmsg r; | |
1406 | char buf[1024]; | |
1407 | } req; | |
1408 | ||
1409 | memset (&req, 0, sizeof req); | |
1410 | ||
1411 | bytelen = (family == AF_INET ? 4 : 16); | |
1412 | ||
1413 | req.n.nlmsg_len = NLMSG_LENGTH (sizeof (struct rtmsg)); | |
1414 | req.n.nlmsg_flags = NLM_F_CREATE | NLM_F_REQUEST; | |
1415 | req.n.nlmsg_type = cmd; | |
1416 | req.r.rtm_family = family; | |
1417 | req.r.rtm_table = rib->table; | |
1418 | req.r.rtm_dst_len = p->prefixlen; | |
1419 | ||
7021c425 | 1420 | if ((rib->flags & ZEBRA_FLAG_BLACKHOLE) || (rib->flags & ZEBRA_FLAG_REJECT)) |
718e3744 | 1421 | discard = 1; |
1422 | else | |
1423 | discard = 0; | |
1424 | ||
7021c425 | 1425 | if (cmd == RTM_NEWROUTE) |
718e3744 | 1426 | { |
1427 | req.r.rtm_protocol = RTPROT_ZEBRA; | |
1428 | req.r.rtm_scope = RT_SCOPE_UNIVERSE; | |
1429 | ||
7021c425 | 1430 | if (discard) |
595db7f1 | 1431 | { |
1432 | if (rib->flags & ZEBRA_FLAG_BLACKHOLE) | |
1433 | req.r.rtm_type = RTN_BLACKHOLE; | |
1434 | else if (rib->flags & ZEBRA_FLAG_REJECT) | |
1435 | req.r.rtm_type = RTN_UNREACHABLE; | |
7021c425 | 1436 | else |
1437 | assert (RTN_BLACKHOLE != RTN_UNREACHABLE); /* false */ | |
1438 | } | |
595db7f1 | 1439 | else |
7021c425 | 1440 | req.r.rtm_type = RTN_UNICAST; |
718e3744 | 1441 | } |
1442 | ||
1443 | addattr_l (&req.n, sizeof req, RTA_DST, &p->u.prefix, bytelen); | |
1444 | ||
1445 | /* Metric. */ | |
1446 | addattr32 (&req.n, sizeof req, RTA_PRIORITY, rib->metric); | |
1447 | ||
1448 | if (discard) | |
1449 | { | |
1450 | if (cmd == RTM_NEWROUTE) | |
7021c425 | 1451 | for (nexthop = rib->nexthop; nexthop; nexthop = nexthop->next) |
1452 | SET_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB); | |
718e3744 | 1453 | goto skip; |
1454 | } | |
1455 | ||
1456 | /* Multipath case. */ | |
1457 | if (rib->nexthop_active_num == 1 || MULTIPATH_NUM == 1) | |
1458 | { | |
1459 | for (nexthop = rib->nexthop; nexthop; nexthop = nexthop->next) | |
7021c425 | 1460 | { |
1461 | ||
1462 | if ((cmd == RTM_NEWROUTE | |
1463 | && CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_ACTIVE)) | |
1464 | || (cmd == RTM_DELROUTE | |
1465 | && CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB))) | |
1466 | { | |
1467 | ||
1468 | if (CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_RECURSIVE)) | |
1469 | { | |
1470 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1471 | { | |
b6178002 | 1472 | zlog_debug |
7021c425 | 1473 | ("netlink_route_multipath() (recursive, 1 hop): " |
206d8055 | 1474 | "%s %s/%d, type %s", lookup (nlmsg_str, cmd), |
1ada8198 | 1475 | #ifdef HAVE_IPV6 |
206d8055 | 1476 | (family == AF_INET) ? inet_ntoa (p->u.prefix4) : |
1ada8198 | 1477 | inet6_ntoa (p->u.prefix6), |
1478 | #else | |
1479 | inet_ntoa (p->u.prefix4), | |
1480 | #endif /* HAVE_IPV6 */ | |
1481 | ||
1482 | p->prefixlen, nexthop_types_desc[nexthop->rtype]); | |
7021c425 | 1483 | } |
1484 | ||
1485 | if (nexthop->rtype == NEXTHOP_TYPE_IPV4 | |
1486 | || nexthop->rtype == NEXTHOP_TYPE_IPV4_IFINDEX) | |
206d8055 | 1487 | { |
1488 | addattr_l (&req.n, sizeof req, RTA_GATEWAY, | |
1489 | &nexthop->rgate.ipv4, bytelen); | |
1490 | ||
1491 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1492 | zlog_debug("netlink_route_multipath() (recursive, " | |
1493 | "1 hop): nexthop via %s if %u", | |
1494 | inet_ntoa (nexthop->rgate.ipv4), | |
1495 | nexthop->rifindex); | |
1496 | } | |
718e3744 | 1497 | #ifdef HAVE_IPV6 |
7021c425 | 1498 | if (nexthop->rtype == NEXTHOP_TYPE_IPV6 |
1499 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFINDEX | |
1500 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFNAME) | |
206d8055 | 1501 | { |
1502 | addattr_l (&req.n, sizeof req, RTA_GATEWAY, | |
1503 | &nexthop->rgate.ipv6, bytelen); | |
1504 | ||
1505 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1506 | zlog_debug("netlink_route_multipath() (recursive, " | |
1507 | "1 hop): nexthop via %s if %u", | |
1508 | inet6_ntoa (nexthop->rgate.ipv6), | |
1509 | nexthop->rifindex); | |
1510 | } | |
718e3744 | 1511 | #endif /* HAVE_IPV6 */ |
7021c425 | 1512 | if (nexthop->rtype == NEXTHOP_TYPE_IFINDEX |
1513 | || nexthop->rtype == NEXTHOP_TYPE_IFNAME | |
1514 | || nexthop->rtype == NEXTHOP_TYPE_IPV4_IFINDEX | |
1515 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFINDEX | |
1516 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFNAME) | |
206d8055 | 1517 | { |
1518 | addattr32 (&req.n, sizeof req, RTA_OIF, | |
1519 | nexthop->rifindex); | |
1520 | ||
1521 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1522 | zlog_debug("netlink_route_multipath() (recursive, " | |
1523 | "1 hop): nexthop via if %u", | |
1524 | nexthop->rifindex); | |
1525 | } | |
7021c425 | 1526 | } |
1527 | else | |
1528 | { | |
1529 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1530 | { | |
b6178002 | 1531 | zlog_debug |
206d8055 | 1532 | ("netlink_route_multipath() (single hop): " |
1533 | "%s %s/%d, type %s", lookup (nlmsg_str, cmd), | |
1ada8198 | 1534 | #ifdef HAVE_IPV6 |
206d8055 | 1535 | (family == AF_INET) ? inet_ntoa (p->u.prefix4) : |
1ada8198 | 1536 | inet6_ntoa (p->u.prefix6), |
1537 | #else | |
1538 | inet_ntoa (p->u.prefix4), | |
1539 | #endif /* HAVE_IPV6 */ | |
1540 | p->prefixlen, nexthop_types_desc[nexthop->type]); | |
7021c425 | 1541 | } |
1542 | ||
1543 | if (nexthop->type == NEXTHOP_TYPE_IPV4 | |
1544 | || nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX) | |
206d8055 | 1545 | { |
1546 | addattr_l (&req.n, sizeof req, RTA_GATEWAY, | |
1547 | &nexthop->gate.ipv4, bytelen); | |
1548 | ||
1549 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1550 | zlog_debug("netlink_route_multipath() (single hop): " | |
1551 | "nexthop via %s if %u", | |
1552 | inet_ntoa (nexthop->gate.ipv4), | |
1553 | nexthop->ifindex); | |
1554 | } | |
718e3744 | 1555 | #ifdef HAVE_IPV6 |
7021c425 | 1556 | if (nexthop->type == NEXTHOP_TYPE_IPV6 |
1557 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFNAME | |
1558 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX) | |
206d8055 | 1559 | { |
1560 | addattr_l (&req.n, sizeof req, RTA_GATEWAY, | |
1561 | &nexthop->gate.ipv6, bytelen); | |
1562 | ||
1563 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1564 | zlog_debug("netlink_route_multipath() (single hop): " | |
1565 | "nexthop via %s if %u", | |
1566 | inet6_ntoa (nexthop->gate.ipv6), | |
1567 | nexthop->ifindex); | |
1568 | } | |
718e3744 | 1569 | #endif /* HAVE_IPV6 */ |
7021c425 | 1570 | if (nexthop->type == NEXTHOP_TYPE_IFINDEX |
1571 | || nexthop->type == NEXTHOP_TYPE_IFNAME | |
1572 | || nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX | |
1573 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX | |
1574 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFNAME) | |
206d8055 | 1575 | { |
1576 | addattr32 (&req.n, sizeof req, RTA_OIF, nexthop->ifindex); | |
1577 | ||
1578 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1579 | zlog_debug("netlink_route_multipath() (single hop): " | |
1580 | "nexthop via if %u", nexthop->ifindex); | |
1581 | } | |
7021c425 | 1582 | } |
1583 | ||
1584 | if (cmd == RTM_NEWROUTE) | |
1585 | SET_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB); | |
1586 | ||
1587 | nexthop_num++; | |
1588 | break; | |
1589 | } | |
1590 | } | |
718e3744 | 1591 | } |
1592 | else | |
1593 | { | |
1594 | char buf[1024]; | |
1595 | struct rtattr *rta = (void *) buf; | |
1596 | struct rtnexthop *rtnh; | |
1597 | ||
1598 | rta->rta_type = RTA_MULTIPATH; | |
7021c425 | 1599 | rta->rta_len = RTA_LENGTH (0); |
1600 | rtnh = RTA_DATA (rta); | |
718e3744 | 1601 | |
1602 | nexthop_num = 0; | |
1603 | for (nexthop = rib->nexthop; | |
7021c425 | 1604 | nexthop && (MULTIPATH_NUM == 0 || nexthop_num < MULTIPATH_NUM); |
1605 | nexthop = nexthop->next) | |
1606 | { | |
1607 | if ((cmd == RTM_NEWROUTE | |
1608 | && CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_ACTIVE)) | |
1609 | || (cmd == RTM_DELROUTE | |
1610 | && CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB))) | |
1611 | { | |
1612 | nexthop_num++; | |
1613 | ||
1614 | rtnh->rtnh_len = sizeof (*rtnh); | |
1615 | rtnh->rtnh_flags = 0; | |
1616 | rtnh->rtnh_hops = 0; | |
1617 | rta->rta_len += rtnh->rtnh_len; | |
1618 | ||
1619 | if (CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_RECURSIVE)) | |
1620 | { | |
1621 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1622 | { | |
b6178002 | 1623 | zlog_debug ("netlink_route_multipath() " |
206d8055 | 1624 | "(recursive, multihop): %s %s/%d type %s", |
1ada8198 | 1625 | lookup (nlmsg_str, cmd), |
1626 | #ifdef HAVE_IPV6 | |
1627 | (family == AF_INET) ? inet_ntoa (p->u.prefix4) : | |
1628 | inet6_ntoa (p->u.prefix6), | |
1629 | #else | |
1630 | inet_ntoa (p->u.prefix4), | |
1631 | #endif /* HAVE_IPV6 */ | |
206d8055 | 1632 | p->prefixlen, nexthop_types_desc[nexthop->rtype]); |
7021c425 | 1633 | } |
1634 | if (nexthop->rtype == NEXTHOP_TYPE_IPV4 | |
1635 | || nexthop->rtype == NEXTHOP_TYPE_IPV4_IFINDEX) | |
1636 | { | |
1637 | rta_addattr_l (rta, 4096, RTA_GATEWAY, | |
1638 | &nexthop->rgate.ipv4, bytelen); | |
1639 | rtnh->rtnh_len += sizeof (struct rtattr) + 4; | |
206d8055 | 1640 | |
1641 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1642 | zlog_debug("netlink_route_multipath() (recursive, " | |
1643 | "multihop): nexthop via %s if %u", | |
1644 | inet_ntoa (nexthop->rgate.ipv4), | |
1645 | nexthop->rifindex); | |
7021c425 | 1646 | } |
718e3744 | 1647 | #ifdef HAVE_IPV6 |
7021c425 | 1648 | if (nexthop->rtype == NEXTHOP_TYPE_IPV6 |
1649 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFNAME | |
1650 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFINDEX) | |
206d8055 | 1651 | { |
1652 | rta_addattr_l (rta, 4096, RTA_GATEWAY, | |
1653 | &nexthop->rgate.ipv6, bytelen); | |
1654 | ||
1655 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1656 | zlog_debug("netlink_route_multipath() (recursive, " | |
1657 | "multihop): nexthop via %s if %u", | |
1658 | inet6_ntoa (nexthop->rgate.ipv6), | |
1659 | nexthop->rifindex); | |
1660 | } | |
718e3744 | 1661 | #endif /* HAVE_IPV6 */ |
7021c425 | 1662 | /* ifindex */ |
1663 | if (nexthop->rtype == NEXTHOP_TYPE_IFINDEX | |
1664 | || nexthop->rtype == NEXTHOP_TYPE_IFNAME | |
1665 | || nexthop->rtype == NEXTHOP_TYPE_IPV4_IFINDEX | |
1666 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFINDEX | |
1667 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFNAME) | |
206d8055 | 1668 | { |
1669 | rtnh->rtnh_ifindex = nexthop->rifindex; | |
1670 | ||
1671 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1672 | zlog_debug("netlink_route_multipath() (recursive, " | |
1673 | "multihop): nexthop via if %u", | |
1674 | nexthop->rifindex); | |
1675 | } | |
7021c425 | 1676 | else |
206d8055 | 1677 | { |
1678 | rtnh->rtnh_ifindex = 0; | |
1679 | } | |
7021c425 | 1680 | } |
1681 | else | |
1682 | { | |
1683 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1684 | { | |
206d8055 | 1685 | zlog_debug ("netlink_route_multipath() (multihop): " |
1686 | "%s %s/%d, type %s", lookup (nlmsg_str, cmd), | |
1ada8198 | 1687 | #ifdef HAVE_IPV6 |
206d8055 | 1688 | (family == AF_INET) ? inet_ntoa (p->u.prefix4) : |
1ada8198 | 1689 | inet6_ntoa (p->u.prefix6), |
1690 | #else | |
1691 | inet_ntoa (p->u.prefix4), | |
1692 | #endif /* HAVE_IPV6 */ | |
1693 | p->prefixlen, nexthop_types_desc[nexthop->type]); | |
7021c425 | 1694 | } |
1695 | if (nexthop->type == NEXTHOP_TYPE_IPV4 | |
1696 | || nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX) | |
1697 | { | |
206d8055 | 1698 | rta_addattr_l (rta, 4096, RTA_GATEWAY, |
1699 | &nexthop->gate.ipv4, bytelen); | |
1700 | rtnh->rtnh_len += sizeof (struct rtattr) + 4; | |
1701 | ||
1702 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1703 | zlog_debug("netlink_route_multipath() (multihop): " | |
1704 | "nexthop via %s if %u", | |
1705 | inet_ntoa (nexthop->gate.ipv4), | |
1706 | nexthop->ifindex); | |
7021c425 | 1707 | } |
718e3744 | 1708 | #ifdef HAVE_IPV6 |
7021c425 | 1709 | if (nexthop->type == NEXTHOP_TYPE_IPV6 |
1710 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFNAME | |
1711 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX) | |
206d8055 | 1712 | { |
1713 | rta_addattr_l (rta, 4096, RTA_GATEWAY, | |
1714 | &nexthop->gate.ipv6, bytelen); | |
1715 | ||
1716 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1717 | zlog_debug("netlink_route_multipath() (multihop): " | |
1718 | "nexthop via %s if %u", | |
1719 | inet6_ntoa (nexthop->gate.ipv6), | |
1720 | nexthop->ifindex); | |
1721 | } | |
718e3744 | 1722 | #endif /* HAVE_IPV6 */ |
7021c425 | 1723 | /* ifindex */ |
1724 | if (nexthop->type == NEXTHOP_TYPE_IFINDEX | |
1725 | || nexthop->type == NEXTHOP_TYPE_IFNAME | |
1726 | || nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX | |
1727 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFNAME | |
1728 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX) | |
206d8055 | 1729 | { |
1730 | rtnh->rtnh_ifindex = nexthop->ifindex; | |
1731 | ||
1732 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1733 | zlog_debug("netlink_route_multipath() (multihop): " | |
1734 | "nexthop via if %u", nexthop->ifindex); | |
1735 | } | |
7021c425 | 1736 | else |
206d8055 | 1737 | { |
1738 | rtnh->rtnh_ifindex = 0; | |
1739 | } | |
7021c425 | 1740 | } |
1741 | rtnh = RTNH_NEXT (rtnh); | |
1742 | ||
1743 | if (cmd == RTM_NEWROUTE) | |
1744 | SET_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB); | |
1745 | } | |
1746 | } | |
718e3744 | 1747 | |
1748 | if (rta->rta_len > RTA_LENGTH (0)) | |
7021c425 | 1749 | addattr_l (&req.n, 1024, RTA_MULTIPATH, RTA_DATA (rta), |
1750 | RTA_PAYLOAD (rta)); | |
718e3744 | 1751 | } |
1752 | ||
1753 | /* If there is no useful nexthop then return. */ | |
1754 | if (nexthop_num == 0) | |
1755 | { | |
1756 | if (IS_ZEBRA_DEBUG_KERNEL) | |
b6178002 | 1757 | zlog_debug ("netlink_route_multipath(): No useful nexthop."); |
718e3744 | 1758 | return 0; |
1759 | } | |
1760 | ||
7021c425 | 1761 | skip: |
718e3744 | 1762 | |
1763 | /* Destination netlink address. */ | |
1764 | memset (&snl, 0, sizeof snl); | |
1765 | snl.nl_family = AF_NETLINK; | |
1766 | ||
718e3744 | 1767 | /* Talk to netlink socket. */ |
b7ed1ec7 | 1768 | return netlink_talk (&req.n, &netlink_cmd); |
718e3744 | 1769 | } |
1770 | ||
1771 | int | |
1772 | kernel_add_ipv4 (struct prefix *p, struct rib *rib) | |
1773 | { | |
1774 | return netlink_route_multipath (RTM_NEWROUTE, p, rib, AF_INET); | |
1775 | } | |
1776 | ||
1777 | int | |
1778 | kernel_delete_ipv4 (struct prefix *p, struct rib *rib) | |
1779 | { | |
1780 | return netlink_route_multipath (RTM_DELROUTE, p, rib, AF_INET); | |
1781 | } | |
1782 | ||
1783 | #ifdef HAVE_IPV6 | |
1784 | int | |
1785 | kernel_add_ipv6 (struct prefix *p, struct rib *rib) | |
1786 | { | |
1787 | return netlink_route_multipath (RTM_NEWROUTE, p, rib, AF_INET6); | |
1788 | } | |
1789 | ||
1790 | int | |
1791 | kernel_delete_ipv6 (struct prefix *p, struct rib *rib) | |
1792 | { | |
1793 | return netlink_route_multipath (RTM_DELROUTE, p, rib, AF_INET6); | |
1794 | } | |
1795 | ||
1796 | /* Delete IPv6 route from the kernel. */ | |
1797 | int | |
1798 | kernel_delete_ipv6_old (struct prefix_ipv6 *dest, struct in6_addr *gate, | |
6621ca86 | 1799 | unsigned int index, int flags, int table) |
718e3744 | 1800 | { |
7021c425 | 1801 | return netlink_route (RTM_DELROUTE, AF_INET6, &dest->prefix, |
1802 | dest->prefixlen, gate, index, flags, table); | |
718e3744 | 1803 | } |
1804 | #endif /* HAVE_IPV6 */ | |
1805 | \f | |
1806 | /* Interface address modification. */ | |
1807 | int | |
1808 | netlink_address (int cmd, int family, struct interface *ifp, | |
7021c425 | 1809 | struct connected *ifc) |
718e3744 | 1810 | { |
1811 | int bytelen; | |
1812 | struct prefix *p; | |
1813 | ||
7021c425 | 1814 | struct |
718e3744 | 1815 | { |
1816 | struct nlmsghdr n; | |
1817 | struct ifaddrmsg ifa; | |
1818 | char buf[1024]; | |
1819 | } req; | |
1820 | ||
1821 | p = ifc->address; | |
1822 | memset (&req, 0, sizeof req); | |
1823 | ||
1824 | bytelen = (family == AF_INET ? 4 : 16); | |
1825 | ||
7021c425 | 1826 | req.n.nlmsg_len = NLMSG_LENGTH (sizeof (struct ifaddrmsg)); |
718e3744 | 1827 | req.n.nlmsg_flags = NLM_F_REQUEST; |
1828 | req.n.nlmsg_type = cmd; | |
1829 | req.ifa.ifa_family = family; | |
1830 | ||
1831 | req.ifa.ifa_index = ifp->ifindex; | |
1832 | req.ifa.ifa_prefixlen = p->prefixlen; | |
1833 | ||
1834 | addattr_l (&req.n, sizeof req, IFA_LOCAL, &p->u.prefix, bytelen); | |
1835 | ||
1836 | if (family == AF_INET && cmd == RTM_NEWADDR) | |
1837 | { | |
1838 | if (if_is_broadcast (ifp) && ifc->destination) | |
7021c425 | 1839 | { |
1840 | p = ifc->destination; | |
1841 | addattr_l (&req.n, sizeof req, IFA_BROADCAST, &p->u.prefix, | |
1842 | bytelen); | |
1843 | } | |
718e3744 | 1844 | } |
1845 | ||
1846 | if (CHECK_FLAG (ifc->flags, ZEBRA_IFA_SECONDARY)) | |
1847 | SET_FLAG (req.ifa.ifa_flags, IFA_F_SECONDARY); | |
7021c425 | 1848 | |
718e3744 | 1849 | if (ifc->label) |
1850 | addattr_l (&req.n, sizeof req, IFA_LABEL, ifc->label, | |
7021c425 | 1851 | strlen (ifc->label) + 1); |
718e3744 | 1852 | |
1853 | return netlink_talk (&req.n, &netlink_cmd); | |
1854 | } | |
1855 | ||
1856 | int | |
1857 | kernel_address_add_ipv4 (struct interface *ifp, struct connected *ifc) | |
1858 | { | |
1859 | return netlink_address (RTM_NEWADDR, AF_INET, ifp, ifc); | |
1860 | } | |
1861 | ||
1862 | int | |
1863 | kernel_address_delete_ipv4 (struct interface *ifp, struct connected *ifc) | |
1864 | { | |
1865 | return netlink_address (RTM_DELADDR, AF_INET, ifp, ifc); | |
1866 | } | |
1867 | ||
718e3744 | 1868 | |
1869 | extern struct thread_master *master; | |
1870 | ||
1871 | /* Kernel route reflection. */ | |
1872 | int | |
1873 | kernel_read (struct thread *thread) | |
1874 | { | |
1875 | int ret; | |
1876 | int sock; | |
1877 | ||
1878 | sock = THREAD_FD (thread); | |
1879 | ret = netlink_parse_info (netlink_information_fetch, &netlink); | |
b21b19c5 | 1880 | thread_add_read (zebrad.master, kernel_read, NULL, netlink.sock); |
718e3744 | 1881 | |
1882 | return 0; | |
1883 | } | |
1884 | ||
1885 | /* Exported interface function. This function simply calls | |
1886 | netlink_socket (). */ | |
1887 | void | |
6621ca86 | 1888 | kernel_init (void) |
718e3744 | 1889 | { |
1890 | unsigned long groups; | |
1891 | ||
7021c425 | 1892 | groups = RTMGRP_LINK | RTMGRP_IPV4_ROUTE | RTMGRP_IPV4_IFADDR; |
718e3744 | 1893 | #ifdef HAVE_IPV6 |
7021c425 | 1894 | groups |= RTMGRP_IPV6_ROUTE | RTMGRP_IPV6_IFADDR; |
718e3744 | 1895 | #endif /* HAVE_IPV6 */ |
1896 | netlink_socket (&netlink, groups); | |
1897 | netlink_socket (&netlink_cmd, 0); | |
1898 | ||
1899 | /* Register kernel socket. */ | |
1900 | if (netlink.sock > 0) | |
b21b19c5 | 1901 | thread_add_read (zebrad.master, kernel_read, NULL, netlink.sock); |
718e3744 | 1902 | } |