]>
Commit | Line | Data |
---|---|---|
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; | |
50 | 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 | ||
68 | char *nexthop_types_desc[] = | |
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 | ||
718e3744 | 87 | /* Make socket for Linux netlink interface. */ |
88 | static int | |
89 | netlink_socket (struct nlsock *nl, unsigned long groups) | |
90 | { | |
91 | int ret; | |
92 | struct sockaddr_nl snl; | |
93 | int sock; | |
94 | int namelen; | |
95 | ||
96 | sock = socket (AF_NETLINK, SOCK_RAW, NETLINK_ROUTE); | |
97 | if (sock < 0) | |
98 | { | |
99 | zlog (NULL, LOG_ERR, "Can't open %s socket: %s", nl->name, | |
7021c425 | 100 | strerror (errno)); |
718e3744 | 101 | return -1; |
102 | } | |
103 | ||
104 | ret = fcntl (sock, F_SETFL, O_NONBLOCK); | |
105 | if (ret < 0) | |
106 | { | |
107 | zlog (NULL, LOG_ERR, "Can't set %s socket flags: %s", nl->name, | |
7021c425 | 108 | strerror (errno)); |
718e3744 | 109 | close (sock); |
110 | return -1; | |
111 | } | |
7021c425 | 112 | |
718e3744 | 113 | memset (&snl, 0, sizeof snl); |
114 | snl.nl_family = AF_NETLINK; | |
115 | snl.nl_groups = groups; | |
116 | ||
117 | /* Bind the socket to the netlink structure for anything. */ | |
7021c425 | 118 | if (zserv_privs.change (ZPRIVS_RAISE)) |
119 | { | |
120 | zlog (NULL, LOG_ERR, "Can't raise privileges"); | |
121 | return -1; | |
122 | } | |
edd7c245 | 123 | |
718e3744 | 124 | ret = bind (sock, (struct sockaddr *) &snl, sizeof snl); |
125 | if (ret < 0) | |
126 | { | |
7021c425 | 127 | if (zserv_privs.change (ZPRIVS_LOWER)) |
edd7c245 | 128 | zlog (NULL, LOG_ERR, "Can't lower privileges"); |
7021c425 | 129 | zlog (NULL, LOG_ERR, "Can't bind %s socket to group 0x%x: %s", |
130 | nl->name, snl.nl_groups, strerror (errno)); | |
718e3744 | 131 | close (sock); |
132 | return -1; | |
133 | } | |
7021c425 | 134 | |
135 | if (zserv_privs.change (ZPRIVS_LOWER)) | |
edd7c245 | 136 | zlog (NULL, LOG_ERR, "Can't lower privileges"); |
718e3744 | 137 | |
138 | /* multiple netlink sockets will have different nl_pid */ | |
139 | namelen = sizeof snl; | |
140 | ret = getsockname (sock, (struct sockaddr *) &snl, &namelen); | |
141 | if (ret < 0 || namelen != sizeof snl) | |
142 | { | |
143 | zlog (NULL, LOG_ERR, "Can't get %s socket name: %s", nl->name, | |
7021c425 | 144 | strerror (errno)); |
718e3744 | 145 | close (sock); |
146 | return -1; | |
147 | } | |
148 | ||
149 | nl->snl = snl; | |
150 | nl->sock = sock; | |
151 | return ret; | |
152 | } | |
153 | ||
7021c425 | 154 | int |
155 | set_netlink_blocking (struct nlsock *nl, int *flags) | |
5f37d86f | 156 | { |
157 | ||
158 | /* Change socket flags for blocking I/O. */ | |
7021c425 | 159 | if ((*flags = fcntl (nl->sock, F_GETFL, 0)) < 0) |
5f37d86f | 160 | { |
7021c425 | 161 | zlog (NULL, LOG_ERR, "%s:%i F_GETFL error: %s", |
162 | __FUNCTION__, __LINE__, strerror (errno)); | |
5f37d86f | 163 | return -1; |
164 | } | |
165 | *flags &= ~O_NONBLOCK; | |
7021c425 | 166 | if (fcntl (nl->sock, F_SETFL, *flags) < 0) |
5f37d86f | 167 | { |
7021c425 | 168 | zlog (NULL, LOG_ERR, "%s:%i F_SETFL error: %s", |
169 | __FUNCTION__, __LINE__, strerror (errno)); | |
5f37d86f | 170 | return -1; |
171 | } | |
172 | return 0; | |
173 | } | |
174 | ||
7021c425 | 175 | int |
176 | set_netlink_nonblocking (struct nlsock *nl, int *flags) | |
177 | { | |
5f37d86f | 178 | /* Restore socket flags for nonblocking I/O */ |
179 | *flags |= O_NONBLOCK; | |
7021c425 | 180 | if (fcntl (nl->sock, F_SETFL, *flags) < 0) |
5f37d86f | 181 | { |
7021c425 | 182 | zlog (NULL, LOG_ERR, "%s:%i F_SETFL error: %s", |
183 | __FUNCTION__, __LINE__, strerror (errno)); | |
5f37d86f | 184 | return -1; |
185 | } | |
186 | return 0; | |
187 | } | |
188 | ||
718e3744 | 189 | /* Get type specified information from netlink. */ |
190 | static int | |
191 | netlink_request (int family, int type, struct nlsock *nl) | |
192 | { | |
193 | int ret; | |
194 | struct sockaddr_nl snl; | |
195 | ||
196 | struct | |
197 | { | |
198 | struct nlmsghdr nlh; | |
199 | struct rtgenmsg g; | |
200 | } req; | |
201 | ||
202 | ||
203 | /* Check netlink socket. */ | |
204 | if (nl->sock < 0) | |
205 | { | |
206 | zlog (NULL, LOG_ERR, "%s socket isn't active.", nl->name); | |
207 | return -1; | |
208 | } | |
209 | ||
210 | memset (&snl, 0, sizeof snl); | |
211 | snl.nl_family = AF_NETLINK; | |
212 | ||
213 | req.nlh.nlmsg_len = sizeof req; | |
214 | req.nlh.nlmsg_type = type; | |
215 | req.nlh.nlmsg_flags = NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST; | |
216 | req.nlh.nlmsg_pid = 0; | |
217 | req.nlh.nlmsg_seq = ++nl->seq; | |
218 | req.g.rtgen_family = family; | |
edd7c245 | 219 | |
220 | /* linux appears to check capabilities on every message | |
221 | * have to raise caps for every message sent | |
222 | */ | |
7021c425 | 223 | if (zserv_privs.change (ZPRIVS_RAISE)) |
edd7c245 | 224 | { |
225 | zlog (NULL, LOG_ERR, "Can't raise privileges"); | |
226 | return -1; | |
227 | } | |
7021c425 | 228 | |
229 | ret = sendto (nl->sock, (void *) &req, sizeof req, 0, | |
230 | (struct sockaddr *) &snl, sizeof snl); | |
231 | ||
232 | if (zserv_privs.change (ZPRIVS_LOWER)) | |
233 | zlog (NULL, LOG_ERR, "Can't lower privileges"); | |
234 | ||
718e3744 | 235 | if (ret < 0) |
7021c425 | 236 | { |
237 | zlog (NULL, LOG_ERR, "%s sendto failed: %s", nl->name, | |
238 | strerror (errno)); | |
718e3744 | 239 | return -1; |
240 | } | |
edd7c245 | 241 | |
718e3744 | 242 | return 0; |
243 | } | |
244 | ||
245 | /* Receive message from netlink interface and pass those information | |
246 | to the given function. */ | |
247 | static int | |
248 | netlink_parse_info (int (*filter) (struct sockaddr_nl *, struct nlmsghdr *), | |
7021c425 | 249 | struct nlsock *nl) |
718e3744 | 250 | { |
251 | int status; | |
252 | int ret = 0; | |
253 | int error; | |
254 | ||
255 | while (1) | |
256 | { | |
257 | char buf[4096]; | |
258 | struct iovec iov = { buf, sizeof buf }; | |
259 | struct sockaddr_nl snl; | |
7021c425 | 260 | struct msghdr msg = { (void *) &snl, sizeof snl, &iov, 1, NULL, 0, 0 }; |
718e3744 | 261 | struct nlmsghdr *h; |
262 | ||
7021c425 | 263 | if (zserv_privs.change (ZPRIVS_RAISE)) |
edd7c245 | 264 | zlog (NULL, LOG_ERR, "Can't raise privileges"); |
7021c425 | 265 | |
718e3744 | 266 | status = recvmsg (nl->sock, &msg, 0); |
7021c425 | 267 | |
268 | if (zserv_privs.change (ZPRIVS_LOWER)) | |
edd7c245 | 269 | zlog (NULL, LOG_ERR, "Can't lower privileges"); |
718e3744 | 270 | |
271 | if (status < 0) | |
7021c425 | 272 | { |
273 | if (errno == EINTR) | |
274 | continue; | |
275 | if (errno == EWOULDBLOCK || errno == EAGAIN) | |
276 | break; | |
277 | zlog (NULL, LOG_ERR, "%s recvmsg overrun", nl->name); | |
278 | continue; | |
279 | } | |
718e3744 | 280 | |
281 | if (status == 0) | |
7021c425 | 282 | { |
283 | zlog (NULL, LOG_ERR, "%s EOF", nl->name); | |
284 | return -1; | |
285 | } | |
718e3744 | 286 | |
287 | if (msg.msg_namelen != sizeof snl) | |
7021c425 | 288 | { |
289 | zlog (NULL, LOG_ERR, "%s sender address length error: length %d", | |
290 | nl->name, msg.msg_namelen); | |
291 | return -1; | |
292 | } | |
293 | ||
294 | for (h = (struct nlmsghdr *) buf; NLMSG_OK (h, status); | |
295 | h = NLMSG_NEXT (h, status)) | |
296 | { | |
297 | /* Finish of reading. */ | |
298 | if (h->nlmsg_type == NLMSG_DONE) | |
299 | return ret; | |
300 | ||
301 | /* Error handling. */ | |
302 | if (h->nlmsg_type == NLMSG_ERROR) | |
303 | { | |
304 | struct nlmsgerr *err = (struct nlmsgerr *) NLMSG_DATA (h); | |
305 | ||
718e3744 | 306 | /* If the error field is zero, then this is an ACK */ |
7021c425 | 307 | if (err->error == 0) |
718e3744 | 308 | { |
7021c425 | 309 | if (IS_ZEBRA_DEBUG_KERNEL) |
310 | { | |
311 | zlog_info ("%s: %s ACK: type=%s(%u), seq=%u, pid=%d", | |
312 | __FUNCTION__, nl->name, | |
313 | lookup (nlmsg_str, err->msg.nlmsg_type), | |
314 | err->msg.nlmsg_type, err->msg.nlmsg_seq, | |
315 | err->msg.nlmsg_pid); | |
718e3744 | 316 | } |
7021c425 | 317 | |
318 | /* return if not a multipart message, otherwise continue */ | |
319 | if (!(h->nlmsg_flags & NLM_F_MULTI)) | |
320 | { | |
321 | return 0; | |
718e3744 | 322 | } |
7021c425 | 323 | continue; |
718e3744 | 324 | } |
7021c425 | 325 | |
718e3744 | 326 | if (h->nlmsg_len < NLMSG_LENGTH (sizeof (struct nlmsgerr))) |
7021c425 | 327 | { |
328 | zlog (NULL, LOG_ERR, "%s error: message truncated", | |
329 | nl->name); | |
330 | return -1; | |
331 | } | |
332 | ||
333 | /* Deal with Error Noise - MAG */ | |
334 | { | |
335 | int loglvl = LOG_ERR; | |
336 | int errnum = err->error; | |
337 | int msg_type = err->msg.nlmsg_type; | |
338 | ||
339 | if (nl == &netlink_cmd | |
340 | && (-errnum == ENODEV || -errnum == ESRCH) | |
341 | && (msg_type == RTM_NEWROUTE || msg_type == RTM_DELROUTE)) | |
342 | loglvl = LOG_DEBUG; | |
343 | ||
344 | zlog (NULL, loglvl, "%s error: %s, type=%s(%u), " | |
345 | "seq=%u, pid=%d", | |
346 | nl->name, strerror (-errnum), | |
347 | lookup (nlmsg_str, msg_type), | |
348 | msg_type, err->msg.nlmsg_seq, err->msg.nlmsg_pid); | |
349 | } | |
350 | /* | |
351 | ret = -1; | |
352 | continue; | |
353 | */ | |
354 | return -1; | |
355 | } | |
356 | ||
357 | /* OK we got netlink message. */ | |
358 | if (IS_ZEBRA_DEBUG_KERNEL) | |
359 | zlog_info ("netlink_parse_info: %s type %s(%u), seq=%u, pid=%d", | |
360 | nl->name, | |
361 | lookup (nlmsg_str, h->nlmsg_type), h->nlmsg_type, | |
362 | h->nlmsg_seq, h->nlmsg_pid); | |
363 | ||
364 | /* skip unsolicited messages originating from command socket */ | |
365 | if (nl != &netlink_cmd && h->nlmsg_pid == netlink_cmd.snl.nl_pid) | |
366 | { | |
367 | if (IS_ZEBRA_DEBUG_KERNEL) | |
368 | zlog_info ("netlink_parse_info: %s packet comes from %s", | |
369 | nl->name, netlink_cmd.name); | |
370 | continue; | |
371 | } | |
372 | ||
373 | error = (*filter) (&snl, h); | |
374 | if (error < 0) | |
375 | { | |
376 | zlog (NULL, LOG_ERR, "%s filter function error", nl->name); | |
377 | ret = error; | |
378 | } | |
379 | } | |
718e3744 | 380 | |
381 | /* After error care. */ | |
382 | if (msg.msg_flags & MSG_TRUNC) | |
7021c425 | 383 | { |
384 | zlog (NULL, LOG_ERR, "%s error: message truncated", nl->name); | |
385 | continue; | |
386 | } | |
718e3744 | 387 | if (status) |
7021c425 | 388 | { |
389 | zlog (NULL, LOG_ERR, "%s error: data remnant size %d", nl->name, | |
390 | status); | |
391 | return -1; | |
392 | } | |
718e3744 | 393 | } |
394 | return ret; | |
395 | } | |
396 | ||
397 | /* Utility function for parse rtattr. */ | |
398 | static void | |
7021c425 | 399 | netlink_parse_rtattr (struct rtattr **tb, int max, struct rtattr *rta, |
400 | int len) | |
718e3744 | 401 | { |
7021c425 | 402 | while (RTA_OK (rta, len)) |
718e3744 | 403 | { |
404 | if (rta->rta_type <= max) | |
7021c425 | 405 | tb[rta->rta_type] = rta; |
406 | rta = RTA_NEXT (rta, len); | |
718e3744 | 407 | } |
408 | } | |
409 | ||
410 | /* Called from interface_lookup_netlink(). This function is only used | |
411 | during bootstrap. */ | |
412 | int | |
413 | netlink_interface (struct sockaddr_nl *snl, struct nlmsghdr *h) | |
414 | { | |
415 | int len; | |
416 | struct ifinfomsg *ifi; | |
417 | struct rtattr *tb[IFLA_MAX + 1]; | |
418 | struct interface *ifp; | |
419 | char *name; | |
420 | int i; | |
421 | ||
422 | ifi = NLMSG_DATA (h); | |
423 | ||
424 | if (h->nlmsg_type != RTM_NEWLINK) | |
425 | return 0; | |
426 | ||
427 | len = h->nlmsg_len - NLMSG_LENGTH (sizeof (struct ifinfomsg)); | |
428 | if (len < 0) | |
429 | return -1; | |
430 | ||
431 | /* Looking up interface name. */ | |
432 | memset (tb, 0, sizeof tb); | |
433 | netlink_parse_rtattr (tb, IFLA_MAX, IFLA_RTA (ifi), len); | |
434 | if (tb[IFLA_IFNAME] == NULL) | |
435 | return -1; | |
7021c425 | 436 | name = (char *) RTA_DATA (tb[IFLA_IFNAME]); |
718e3744 | 437 | |
438 | /* Add interface. */ | |
439 | ifp = if_get_by_name (name); | |
7021c425 | 440 | |
718e3744 | 441 | ifp->ifindex = ifi->ifi_index; |
442 | ifp->flags = ifi->ifi_flags & 0x0000fffff; | |
7021c425 | 443 | ifp->mtu = *(int *) RTA_DATA (tb[IFLA_MTU]); |
718e3744 | 444 | ifp->metric = 1; |
445 | ||
446 | /* Hardware type and address. */ | |
447 | ifp->hw_type = ifi->ifi_type; | |
448 | ||
449 | if (tb[IFLA_ADDRESS]) | |
450 | { | |
451 | int hw_addr_len; | |
452 | ||
7021c425 | 453 | hw_addr_len = RTA_PAYLOAD (tb[IFLA_ADDRESS]); |
718e3744 | 454 | |
455 | if (hw_addr_len > INTERFACE_HWADDR_MAX) | |
7021c425 | 456 | zlog_warn ("Hardware address is too large: %d", hw_addr_len); |
718e3744 | 457 | else |
7021c425 | 458 | { |
459 | ifp->hw_addr_len = hw_addr_len; | |
460 | memcpy (ifp->hw_addr, RTA_DATA (tb[IFLA_ADDRESS]), hw_addr_len); | |
461 | ||
462 | for (i = 0; i < hw_addr_len; i++) | |
463 | if (ifp->hw_addr[i] != 0) | |
464 | break; | |
465 | ||
466 | if (i == hw_addr_len) | |
467 | ifp->hw_addr_len = 0; | |
468 | else | |
469 | ifp->hw_addr_len = hw_addr_len; | |
470 | } | |
718e3744 | 471 | } |
472 | ||
473 | if_add_update (ifp); | |
474 | ||
475 | return 0; | |
476 | } | |
477 | ||
478 | /* Lookup interface IPv4/IPv6 address. */ | |
479 | int | |
480 | netlink_interface_addr (struct sockaddr_nl *snl, struct nlmsghdr *h) | |
481 | { | |
482 | int len; | |
483 | struct ifaddrmsg *ifa; | |
7021c425 | 484 | struct rtattr *tb[IFA_MAX + 1]; |
718e3744 | 485 | struct interface *ifp; |
486 | void *addr = NULL; | |
487 | void *broad = NULL; | |
488 | u_char flags = 0; | |
489 | char *label = NULL; | |
00df0c1e | 490 | int peeronly = 0; |
718e3744 | 491 | |
492 | ifa = NLMSG_DATA (h); | |
493 | ||
7021c425 | 494 | if (ifa->ifa_family != AF_INET |
718e3744 | 495 | #ifdef HAVE_IPV6 |
496 | && ifa->ifa_family != AF_INET6 | |
497 | #endif /* HAVE_IPV6 */ | |
7021c425 | 498 | ) |
718e3744 | 499 | return 0; |
500 | ||
501 | if (h->nlmsg_type != RTM_NEWADDR && h->nlmsg_type != RTM_DELADDR) | |
502 | return 0; | |
503 | ||
7021c425 | 504 | len = h->nlmsg_len - NLMSG_LENGTH (sizeof (struct ifaddrmsg)); |
718e3744 | 505 | if (len < 0) |
506 | return -1; | |
507 | ||
508 | memset (tb, 0, sizeof tb); | |
509 | netlink_parse_rtattr (tb, IFA_MAX, IFA_RTA (ifa), len); | |
510 | ||
511 | ifp = if_lookup_by_index (ifa->ifa_index); | |
512 | if (ifp == NULL) | |
513 | { | |
514 | zlog_err ("netlink_interface_addr can't find interface by index %d", | |
7021c425 | 515 | ifa->ifa_index); |
718e3744 | 516 | return -1; |
517 | } | |
518 | ||
7021c425 | 519 | if (IS_ZEBRA_DEBUG_KERNEL) /* remove this line to see initial ifcfg */ |
718e3744 | 520 | { |
00df0c1e | 521 | char buf[BUFSIZ]; |
522 | zlog_info ("netlink_interface_addr %s %s/%d:", | |
7021c425 | 523 | lookup (nlmsg_str, h->nlmsg_type), |
524 | ifp->name, ifa->ifa_prefixlen); | |
718e3744 | 525 | if (tb[IFA_LOCAL]) |
7021c425 | 526 | zlog_info (" IFA_LOCAL %s", inet_ntop (ifa->ifa_family, |
527 | RTA_DATA (tb[IFA_LOCAL]), | |
528 | buf, BUFSIZ)); | |
718e3744 | 529 | if (tb[IFA_ADDRESS]) |
7021c425 | 530 | zlog_info (" IFA_ADDRESS %s", inet_ntop (ifa->ifa_family, |
531 | RTA_DATA (tb | |
532 | [IFA_ADDRESS]), | |
533 | buf, BUFSIZ)); | |
718e3744 | 534 | if (tb[IFA_BROADCAST]) |
7021c425 | 535 | zlog_info (" IFA_BROADCAST %s", inet_ntop (ifa->ifa_family, |
536 | RTA_DATA (tb | |
537 | [IFA_BROADCAST]), | |
538 | buf, BUFSIZ)); | |
00df0c1e | 539 | if (tb[IFA_LABEL] && strcmp (ifp->name, RTA_DATA (tb[IFA_LABEL]))) |
7021c425 | 540 | zlog_info (" IFA_LABEL %s", RTA_DATA (tb[IFA_LABEL])); |
718e3744 | 541 | } |
542 | ||
00df0c1e | 543 | /* peer or broadcast network? */ |
544 | if (ifa->ifa_family == AF_INET) | |
545 | peeronly = if_is_pointopoint (ifp) || | |
7021c425 | 546 | ifa->ifa_prefixlen >= IPV4_MAX_PREFIXLEN - 1; |
00df0c1e | 547 | #ifdef HAVE_IPV6 |
7021c425 | 548 | if (ifa->ifa_family == AF_INET6) |
549 | { | |
550 | peeronly = if_is_pointopoint (ifp) || | |
551 | ifa->ifa_prefixlen >= IPV6_MAX_PREFIXLEN - 1; | |
552 | } | |
553 | #endif /* HAVE_IPV6 */ | |
554 | if (!(tb[IFA_LOCAL] && tb[IFA_ADDRESS])) | |
555 | { | |
556 | /* FIXME: IPv6 Appears to have only IFA_ADDRESS */ | |
557 | peeronly = 0; | |
558 | } | |
00df0c1e | 559 | |
560 | /* network. prefixlen applies to IFA_ADDRESS rather than IFA_LOCAL */ | |
561 | if (tb[IFA_ADDRESS] && !peeronly) | |
562 | addr = RTA_DATA (tb[IFA_ADDRESS]); | |
563 | else if (tb[IFA_LOCAL]) | |
564 | addr = RTA_DATA (tb[IFA_LOCAL]); | |
565 | else | |
566 | addr = NULL; | |
567 | ||
568 | /* broadcast/peer */ | |
569 | if (tb[IFA_BROADCAST]) | |
570 | broad = RTA_DATA (tb[IFA_BROADCAST]); | |
571 | else if (tb[IFA_ADDRESS] && peeronly) | |
7021c425 | 572 | broad = RTA_DATA (tb[IFA_ADDRESS]); /* peer address specified */ |
00df0c1e | 573 | else |
574 | broad = NULL; | |
575 | ||
718e3744 | 576 | /* Flags. */ |
577 | if (ifa->ifa_flags & IFA_F_SECONDARY) | |
578 | SET_FLAG (flags, ZEBRA_IFA_SECONDARY); | |
579 | ||
580 | /* Label */ | |
581 | if (tb[IFA_LABEL]) | |
582 | label = (char *) RTA_DATA (tb[IFA_LABEL]); | |
583 | ||
584 | if (ifp && label && strcmp (ifp->name, label) == 0) | |
585 | label = NULL; | |
586 | ||
587 | /* Register interface address to the interface. */ | |
588 | if (ifa->ifa_family == AF_INET) | |
589 | { | |
7021c425 | 590 | if (h->nlmsg_type == RTM_NEWADDR) |
591 | connected_add_ipv4 (ifp, flags, | |
592 | (struct in_addr *) addr, ifa->ifa_prefixlen, | |
593 | (struct in_addr *) broad, label); | |
594 | else | |
595 | connected_delete_ipv4 (ifp, flags, | |
596 | (struct in_addr *) addr, ifa->ifa_prefixlen, | |
597 | (struct in_addr *) broad, label); | |
718e3744 | 598 | } |
599 | #ifdef HAVE_IPV6 | |
600 | if (ifa->ifa_family == AF_INET6) | |
601 | { | |
602 | if (h->nlmsg_type == RTM_NEWADDR) | |
7021c425 | 603 | connected_add_ipv6 (ifp, |
604 | (struct in6_addr *) addr, ifa->ifa_prefixlen, | |
605 | (struct in6_addr *) broad); | |
718e3744 | 606 | else |
7021c425 | 607 | connected_delete_ipv6 (ifp, |
608 | (struct in6_addr *) addr, ifa->ifa_prefixlen, | |
609 | (struct in6_addr *) broad); | |
718e3744 | 610 | } |
7021c425 | 611 | #endif /* HAVE_IPV6 */ |
718e3744 | 612 | |
613 | return 0; | |
614 | } | |
615 | ||
616 | /* Looking up routing table by netlink interface. */ | |
617 | int | |
618 | netlink_routing_table (struct sockaddr_nl *snl, struct nlmsghdr *h) | |
619 | { | |
620 | int len; | |
621 | struct rtmsg *rtm; | |
7021c425 | 622 | struct rtattr *tb[RTA_MAX + 1]; |
718e3744 | 623 | u_char flags = 0; |
7021c425 | 624 | |
625 | char anyaddr[16] = { 0 }; | |
718e3744 | 626 | |
627 | int index; | |
628 | int table; | |
629 | void *dest; | |
630 | void *gate; | |
631 | ||
632 | rtm = NLMSG_DATA (h); | |
633 | ||
634 | if (h->nlmsg_type != RTM_NEWROUTE) | |
635 | return 0; | |
636 | if (rtm->rtm_type != RTN_UNICAST) | |
637 | return 0; | |
638 | ||
639 | table = rtm->rtm_table; | |
7021c425 | 640 | #if 0 /* we weed them out later in rib_weed_tables () */ |
b21b19c5 | 641 | if (table != RT_TABLE_MAIN && table != zebrad.rtm_table_default) |
718e3744 | 642 | return 0; |
643 | #endif | |
644 | ||
7021c425 | 645 | len = h->nlmsg_len - NLMSG_LENGTH (sizeof (struct rtmsg)); |
718e3744 | 646 | if (len < 0) |
647 | return -1; | |
648 | ||
649 | memset (tb, 0, sizeof tb); | |
650 | netlink_parse_rtattr (tb, RTA_MAX, RTM_RTA (rtm), len); | |
651 | ||
652 | if (rtm->rtm_flags & RTM_F_CLONED) | |
653 | return 0; | |
654 | if (rtm->rtm_protocol == RTPROT_REDIRECT) | |
655 | return 0; | |
656 | if (rtm->rtm_protocol == RTPROT_KERNEL) | |
657 | return 0; | |
658 | ||
659 | if (rtm->rtm_src_len != 0) | |
660 | return 0; | |
661 | ||
662 | /* Route which inserted by Zebra. */ | |
663 | if (rtm->rtm_protocol == RTPROT_ZEBRA) | |
664 | flags |= ZEBRA_FLAG_SELFROUTE; | |
7021c425 | 665 | |
718e3744 | 666 | index = 0; |
667 | dest = NULL; | |
668 | gate = NULL; | |
669 | ||
670 | if (tb[RTA_OIF]) | |
671 | index = *(int *) RTA_DATA (tb[RTA_OIF]); | |
672 | ||
673 | if (tb[RTA_DST]) | |
674 | dest = RTA_DATA (tb[RTA_DST]); | |
675 | else | |
676 | dest = anyaddr; | |
677 | ||
678 | /* Multipath treatment is needed. */ | |
679 | if (tb[RTA_GATEWAY]) | |
680 | gate = RTA_DATA (tb[RTA_GATEWAY]); | |
681 | ||
682 | if (rtm->rtm_family == AF_INET) | |
683 | { | |
684 | struct prefix_ipv4 p; | |
685 | p.family = AF_INET; | |
686 | memcpy (&p.prefix, dest, 4); | |
687 | p.prefixlen = rtm->rtm_dst_len; | |
688 | ||
689 | rib_add_ipv4 (ZEBRA_ROUTE_KERNEL, flags, &p, gate, index, table, 0, 0); | |
690 | } | |
691 | #ifdef HAVE_IPV6 | |
692 | if (rtm->rtm_family == AF_INET6) | |
693 | { | |
694 | struct prefix_ipv6 p; | |
695 | p.family = AF_INET6; | |
696 | memcpy (&p.prefix, dest, 16); | |
697 | p.prefixlen = rtm->rtm_dst_len; | |
698 | ||
699 | rib_add_ipv6 (ZEBRA_ROUTE_KERNEL, flags, &p, gate, index, table); | |
700 | } | |
701 | #endif /* HAVE_IPV6 */ | |
702 | ||
703 | return 0; | |
704 | } | |
705 | ||
7021c425 | 706 | struct message rtproto_str[] = { |
718e3744 | 707 | {RTPROT_REDIRECT, "redirect"}, |
708 | {RTPROT_KERNEL, "kernel"}, | |
709 | {RTPROT_BOOT, "boot"}, | |
710 | {RTPROT_STATIC, "static"}, | |
711 | {RTPROT_GATED, "GateD"}, | |
712 | {RTPROT_RA, "router advertisement"}, | |
713 | {RTPROT_MRT, "MRT"}, | |
714 | {RTPROT_ZEBRA, "Zebra"}, | |
715 | #ifdef RTPROT_BIRD | |
716 | {RTPROT_BIRD, "BIRD"}, | |
717 | #endif /* RTPROT_BIRD */ | |
718 | {0, NULL} | |
719 | }; | |
720 | ||
721 | /* Routing information change from the kernel. */ | |
722 | int | |
723 | netlink_route_change (struct sockaddr_nl *snl, struct nlmsghdr *h) | |
724 | { | |
725 | int len; | |
726 | struct rtmsg *rtm; | |
7021c425 | 727 | struct rtattr *tb[RTA_MAX + 1]; |
728 | ||
729 | char anyaddr[16] = { 0 }; | |
718e3744 | 730 | |
731 | int index; | |
732 | int table; | |
733 | void *dest; | |
734 | void *gate; | |
735 | ||
736 | rtm = NLMSG_DATA (h); | |
737 | ||
7021c425 | 738 | if (!(h->nlmsg_type == RTM_NEWROUTE || h->nlmsg_type == RTM_DELROUTE)) |
718e3744 | 739 | { |
740 | /* If this is not route add/delete message print warning. */ | |
741 | zlog_warn ("Kernel message: %d\n", h->nlmsg_type); | |
742 | return 0; | |
743 | } | |
744 | ||
745 | /* Connected route. */ | |
746 | if (IS_ZEBRA_DEBUG_KERNEL) | |
747 | zlog_info ("%s %s %s proto %s", | |
7021c425 | 748 | h->nlmsg_type == |
749 | RTM_NEWROUTE ? "RTM_NEWROUTE" : "RTM_DELROUTE", | |
750 | rtm->rtm_family == AF_INET ? "ipv4" : "ipv6", | |
751 | rtm->rtm_type == RTN_UNICAST ? "unicast" : "multicast", | |
752 | lookup (rtproto_str, rtm->rtm_protocol)); | |
718e3744 | 753 | |
754 | if (rtm->rtm_type != RTN_UNICAST) | |
755 | { | |
756 | return 0; | |
757 | } | |
758 | ||
759 | table = rtm->rtm_table; | |
b21b19c5 | 760 | if (table != RT_TABLE_MAIN && table != zebrad.rtm_table_default) |
718e3744 | 761 | { |
762 | return 0; | |
763 | } | |
764 | ||
7021c425 | 765 | len = h->nlmsg_len - NLMSG_LENGTH (sizeof (struct rtmsg)); |
718e3744 | 766 | if (len < 0) |
767 | return -1; | |
768 | ||
769 | memset (tb, 0, sizeof tb); | |
770 | netlink_parse_rtattr (tb, RTA_MAX, RTM_RTA (rtm), len); | |
771 | ||
772 | if (rtm->rtm_flags & RTM_F_CLONED) | |
773 | return 0; | |
774 | if (rtm->rtm_protocol == RTPROT_REDIRECT) | |
775 | return 0; | |
776 | if (rtm->rtm_protocol == RTPROT_KERNEL) | |
777 | return 0; | |
778 | ||
779 | if (rtm->rtm_protocol == RTPROT_ZEBRA && h->nlmsg_type == RTM_NEWROUTE) | |
780 | return 0; | |
781 | ||
782 | if (rtm->rtm_src_len != 0) | |
783 | { | |
784 | zlog_warn ("netlink_route_change(): no src len"); | |
785 | return 0; | |
786 | } | |
7021c425 | 787 | |
718e3744 | 788 | index = 0; |
789 | dest = NULL; | |
790 | gate = NULL; | |
791 | ||
792 | if (tb[RTA_OIF]) | |
793 | index = *(int *) RTA_DATA (tb[RTA_OIF]); | |
794 | ||
795 | if (tb[RTA_DST]) | |
796 | dest = RTA_DATA (tb[RTA_DST]); | |
797 | else | |
798 | dest = anyaddr; | |
799 | ||
800 | if (tb[RTA_GATEWAY]) | |
801 | gate = RTA_DATA (tb[RTA_GATEWAY]); | |
802 | ||
803 | if (rtm->rtm_family == AF_INET) | |
804 | { | |
805 | struct prefix_ipv4 p; | |
806 | p.family = AF_INET; | |
807 | memcpy (&p.prefix, dest, 4); | |
808 | p.prefixlen = rtm->rtm_dst_len; | |
809 | ||
810 | if (IS_ZEBRA_DEBUG_KERNEL) | |
7021c425 | 811 | { |
812 | if (h->nlmsg_type == RTM_NEWROUTE) | |
813 | zlog_info ("RTM_NEWROUTE %s/%d", | |
814 | inet_ntoa (p.prefix), p.prefixlen); | |
815 | else | |
816 | zlog_info ("RTM_DELROUTE %s/%d", | |
817 | inet_ntoa (p.prefix), p.prefixlen); | |
818 | } | |
718e3744 | 819 | |
820 | if (h->nlmsg_type == RTM_NEWROUTE) | |
7021c425 | 821 | rib_add_ipv4 (ZEBRA_ROUTE_KERNEL, 0, &p, gate, index, table, 0, 0); |
718e3744 | 822 | else |
7021c425 | 823 | rib_delete_ipv4 (ZEBRA_ROUTE_KERNEL, 0, &p, gate, index, table); |
718e3744 | 824 | } |
825 | ||
826 | #ifdef HAVE_IPV6 | |
827 | if (rtm->rtm_family == AF_INET6) | |
828 | { | |
829 | struct prefix_ipv6 p; | |
830 | char buf[BUFSIZ]; | |
831 | ||
832 | p.family = AF_INET6; | |
833 | memcpy (&p.prefix, dest, 16); | |
834 | p.prefixlen = rtm->rtm_dst_len; | |
835 | ||
836 | if (IS_ZEBRA_DEBUG_KERNEL) | |
7021c425 | 837 | { |
838 | if (h->nlmsg_type == RTM_NEWROUTE) | |
839 | zlog_info ("RTM_NEWROUTE %s/%d", | |
840 | inet_ntop (AF_INET6, &p.prefix, buf, BUFSIZ), | |
841 | p.prefixlen); | |
842 | else | |
843 | zlog_info ("RTM_DELROUTE %s/%d", | |
844 | inet_ntop (AF_INET6, &p.prefix, buf, BUFSIZ), | |
845 | p.prefixlen); | |
846 | } | |
718e3744 | 847 | |
848 | if (h->nlmsg_type == RTM_NEWROUTE) | |
7021c425 | 849 | rib_add_ipv6 (ZEBRA_ROUTE_KERNEL, 0, &p, gate, index, 0); |
718e3744 | 850 | else |
7021c425 | 851 | rib_delete_ipv6 (ZEBRA_ROUTE_KERNEL, 0, &p, gate, index, 0); |
718e3744 | 852 | } |
853 | #endif /* HAVE_IPV6 */ | |
854 | ||
855 | return 0; | |
856 | } | |
857 | ||
858 | int | |
859 | netlink_link_change (struct sockaddr_nl *snl, struct nlmsghdr *h) | |
860 | { | |
861 | int len; | |
862 | struct ifinfomsg *ifi; | |
7021c425 | 863 | struct rtattr *tb[IFLA_MAX + 1]; |
718e3744 | 864 | struct interface *ifp; |
865 | char *name; | |
866 | ||
867 | ifi = NLMSG_DATA (h); | |
868 | ||
7021c425 | 869 | if (!(h->nlmsg_type == RTM_NEWLINK || h->nlmsg_type == RTM_DELLINK)) |
718e3744 | 870 | { |
871 | /* If this is not link add/delete message so print warning. */ | |
872 | zlog_warn ("netlink_link_change: wrong kernel message %d\n", | |
7021c425 | 873 | h->nlmsg_type); |
718e3744 | 874 | return 0; |
875 | } | |
876 | ||
877 | len = h->nlmsg_len - NLMSG_LENGTH (sizeof (struct ifinfomsg)); | |
878 | if (len < 0) | |
879 | return -1; | |
880 | ||
881 | /* Looking up interface name. */ | |
882 | memset (tb, 0, sizeof tb); | |
883 | netlink_parse_rtattr (tb, IFLA_MAX, IFLA_RTA (ifi), len); | |
884 | if (tb[IFLA_IFNAME] == NULL) | |
885 | return -1; | |
7021c425 | 886 | name = (char *) RTA_DATA (tb[IFLA_IFNAME]); |
718e3744 | 887 | |
888 | /* Add interface. */ | |
889 | if (h->nlmsg_type == RTM_NEWLINK) | |
890 | { | |
891 | ifp = if_lookup_by_name (name); | |
892 | ||
7021c425 | 893 | if (ifp == NULL || !CHECK_FLAG (ifp->status, ZEBRA_INTERFACE_ACTIVE)) |
894 | { | |
895 | if (ifp == NULL) | |
896 | ifp = if_get_by_name (name); | |
718e3744 | 897 | |
7021c425 | 898 | ifp->ifindex = ifi->ifi_index; |
899 | ifp->flags = ifi->ifi_flags & 0x0000fffff; | |
900 | ifp->mtu = *(int *) RTA_DATA (tb[IFLA_MTU]); | |
901 | ifp->metric = 1; | |
718e3744 | 902 | |
7021c425 | 903 | /* If new link is added. */ |
904 | if_add_update (ifp); | |
905 | } | |
718e3744 | 906 | else |
7021c425 | 907 | { |
908 | /* Interface status change. */ | |
909 | ifp->ifindex = ifi->ifi_index; | |
910 | ifp->mtu = *(int *) RTA_DATA (tb[IFLA_MTU]); | |
911 | ifp->metric = 1; | |
912 | ||
913 | if (if_is_operative (ifp)) | |
914 | { | |
915 | ifp->flags = ifi->ifi_flags & 0x0000fffff; | |
916 | if (!if_is_operative (ifp)) | |
917 | if_down (ifp); | |
918 | } | |
919 | else | |
920 | { | |
921 | ifp->flags = ifi->ifi_flags & 0x0000fffff; | |
922 | if (if_is_operative (ifp)) | |
923 | if_up (ifp); | |
924 | } | |
925 | } | |
718e3744 | 926 | } |
927 | else | |
928 | { | |
929 | /* RTM_DELLINK. */ | |
930 | ifp = if_lookup_by_name (name); | |
931 | ||
932 | if (ifp == NULL) | |
7021c425 | 933 | { |
934 | zlog (NULL, LOG_WARNING, "interface %s is deleted but can't find", | |
718e3744 | 935 | name); |
7021c425 | 936 | return 0; |
937 | } | |
938 | ||
718e3744 | 939 | if_delete_update (ifp); |
940 | } | |
941 | ||
942 | return 0; | |
943 | } | |
944 | ||
945 | int | |
946 | netlink_information_fetch (struct sockaddr_nl *snl, struct nlmsghdr *h) | |
947 | { | |
948 | switch (h->nlmsg_type) | |
949 | { | |
950 | case RTM_NEWROUTE: | |
951 | return netlink_route_change (snl, h); | |
952 | break; | |
953 | case RTM_DELROUTE: | |
954 | return netlink_route_change (snl, h); | |
955 | break; | |
956 | case RTM_NEWLINK: | |
957 | return netlink_link_change (snl, h); | |
958 | break; | |
959 | case RTM_DELLINK: | |
960 | return netlink_link_change (snl, h); | |
961 | break; | |
962 | case RTM_NEWADDR: | |
963 | return netlink_interface_addr (snl, h); | |
964 | break; | |
965 | case RTM_DELADDR: | |
966 | return netlink_interface_addr (snl, h); | |
967 | break; | |
968 | default: | |
969 | zlog_warn ("Unknown netlink nlmsg_type %d\n", h->nlmsg_type); | |
970 | break; | |
971 | } | |
972 | return 0; | |
973 | } | |
974 | ||
975 | /* Interface lookup by netlink socket. */ | |
976 | int | |
977 | interface_lookup_netlink () | |
978 | { | |
979 | int ret; | |
5f37d86f | 980 | int flags; |
981 | int snb_ret; | |
7021c425 | 982 | |
5f37d86f | 983 | /* |
984 | * Change netlink socket flags to blocking to ensure we get | |
985 | * a reply via nelink_parse_info | |
7021c425 | 986 | */ |
987 | snb_ret = set_netlink_blocking (&netlink_cmd, &flags); | |
988 | if (snb_ret < 0) | |
989 | zlog (NULL, LOG_WARNING, | |
990 | "%s:%i Warning: Could not set netlink socket to blocking.", | |
991 | __FUNCTION__, __LINE__); | |
992 | ||
718e3744 | 993 | /* Get interface information. */ |
994 | ret = netlink_request (AF_PACKET, RTM_GETLINK, &netlink_cmd); | |
995 | if (ret < 0) | |
996 | return ret; | |
997 | ret = netlink_parse_info (netlink_interface, &netlink_cmd); | |
998 | if (ret < 0) | |
999 | return ret; | |
1000 | ||
1001 | /* Get IPv4 address of the interfaces. */ | |
1002 | ret = netlink_request (AF_INET, RTM_GETADDR, &netlink_cmd); | |
1003 | if (ret < 0) | |
1004 | return ret; | |
1005 | ret = netlink_parse_info (netlink_interface_addr, &netlink_cmd); | |
1006 | if (ret < 0) | |
1007 | return ret; | |
1008 | ||
1009 | #ifdef HAVE_IPV6 | |
1010 | /* Get IPv6 address of the interfaces. */ | |
1011 | ret = netlink_request (AF_INET6, RTM_GETADDR, &netlink_cmd); | |
1012 | if (ret < 0) | |
1013 | return ret; | |
1014 | ret = netlink_parse_info (netlink_interface_addr, &netlink_cmd); | |
1015 | if (ret < 0) | |
1016 | return ret; | |
1017 | #endif /* HAVE_IPV6 */ | |
1018 | ||
7021c425 | 1019 | /* restore socket flags */ |
1020 | if (snb_ret == 0) | |
1021 | set_netlink_nonblocking (&netlink_cmd, &flags); | |
718e3744 | 1022 | return 0; |
1023 | } | |
1024 | ||
1025 | /* Routing table read function using netlink interface. Only called | |
1026 | bootstrap time. */ | |
1027 | int | |
1028 | netlink_route_read () | |
1029 | { | |
1030 | int ret; | |
5f37d86f | 1031 | int flags; |
1032 | int snb_ret; | |
7021c425 | 1033 | |
5f37d86f | 1034 | /* |
1035 | * Change netlink socket flags to blocking to ensure we get | |
1036 | * a reply via nelink_parse_info | |
7021c425 | 1037 | */ |
1038 | snb_ret = set_netlink_blocking (&netlink_cmd, &flags); | |
1039 | if (snb_ret < 0) | |
1040 | zlog (NULL, LOG_WARNING, | |
1041 | "%s:%i Warning: Could not set netlink socket to blocking.", | |
1042 | __FUNCTION__, __LINE__); | |
1043 | ||
718e3744 | 1044 | /* Get IPv4 routing table. */ |
1045 | ret = netlink_request (AF_INET, RTM_GETROUTE, &netlink_cmd); | |
1046 | if (ret < 0) | |
1047 | return ret; | |
1048 | ret = netlink_parse_info (netlink_routing_table, &netlink_cmd); | |
1049 | if (ret < 0) | |
1050 | return ret; | |
1051 | ||
1052 | #ifdef HAVE_IPV6 | |
1053 | /* Get IPv6 routing table. */ | |
1054 | ret = netlink_request (AF_INET6, RTM_GETROUTE, &netlink_cmd); | |
1055 | if (ret < 0) | |
1056 | return ret; | |
1057 | ret = netlink_parse_info (netlink_routing_table, &netlink_cmd); | |
1058 | if (ret < 0) | |
1059 | return ret; | |
1060 | #endif /* HAVE_IPV6 */ | |
1061 | ||
5f37d86f | 1062 | /* restore flags */ |
7021c425 | 1063 | if (snb_ret == 0) |
1064 | set_netlink_nonblocking (&netlink_cmd, &flags); | |
718e3744 | 1065 | return 0; |
1066 | } | |
1067 | ||
1068 | /* Utility function comes from iproute2. | |
1069 | Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> */ | |
1070 | int | |
1071 | addattr_l (struct nlmsghdr *n, int maxlen, int type, void *data, int alen) | |
1072 | { | |
1073 | int len; | |
1074 | struct rtattr *rta; | |
1075 | ||
7021c425 | 1076 | len = RTA_LENGTH (alen); |
718e3744 | 1077 | |
7021c425 | 1078 | if (NLMSG_ALIGN (n->nlmsg_len) + len > maxlen) |
718e3744 | 1079 | return -1; |
1080 | ||
7021c425 | 1081 | rta = (struct rtattr *) (((char *) n) + NLMSG_ALIGN (n->nlmsg_len)); |
718e3744 | 1082 | rta->rta_type = type; |
1083 | rta->rta_len = len; | |
7021c425 | 1084 | memcpy (RTA_DATA (rta), data, alen); |
718e3744 | 1085 | n->nlmsg_len = NLMSG_ALIGN (n->nlmsg_len) + len; |
1086 | ||
1087 | return 0; | |
1088 | } | |
1089 | ||
1090 | int | |
1091 | rta_addattr_l (struct rtattr *rta, int maxlen, int type, void *data, int alen) | |
1092 | { | |
1093 | int len; | |
1094 | struct rtattr *subrta; | |
1095 | ||
7021c425 | 1096 | len = RTA_LENGTH (alen); |
718e3744 | 1097 | |
7021c425 | 1098 | if (RTA_ALIGN (rta->rta_len) + len > maxlen) |
718e3744 | 1099 | return -1; |
1100 | ||
7021c425 | 1101 | subrta = (struct rtattr *) (((char *) rta) + RTA_ALIGN (rta->rta_len)); |
718e3744 | 1102 | subrta->rta_type = type; |
1103 | subrta->rta_len = len; | |
7021c425 | 1104 | memcpy (RTA_DATA (subrta), data, alen); |
718e3744 | 1105 | rta->rta_len = NLMSG_ALIGN (rta->rta_len) + len; |
1106 | ||
1107 | return 0; | |
1108 | } | |
1109 | ||
1110 | /* Utility function comes from iproute2. | |
1111 | Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> */ | |
1112 | int | |
1113 | addattr32 (struct nlmsghdr *n, int maxlen, int type, int data) | |
1114 | { | |
1115 | int len; | |
1116 | struct rtattr *rta; | |
7021c425 | 1117 | |
1118 | len = RTA_LENGTH (4); | |
1119 | ||
718e3744 | 1120 | if (NLMSG_ALIGN (n->nlmsg_len) + len > maxlen) |
1121 | return -1; | |
1122 | ||
7021c425 | 1123 | rta = (struct rtattr *) (((char *) n) + NLMSG_ALIGN (n->nlmsg_len)); |
718e3744 | 1124 | rta->rta_type = type; |
1125 | rta->rta_len = len; | |
7021c425 | 1126 | memcpy (RTA_DATA (rta), &data, 4); |
718e3744 | 1127 | n->nlmsg_len = NLMSG_ALIGN (n->nlmsg_len) + len; |
1128 | ||
1129 | return 0; | |
1130 | } | |
1131 | ||
1132 | static int | |
1133 | netlink_talk_filter (struct sockaddr_nl *snl, struct nlmsghdr *h) | |
1134 | { | |
1135 | zlog_warn ("netlink_talk: ignoring message type 0x%04x", h->nlmsg_type); | |
1136 | return 0; | |
1137 | } | |
1138 | ||
1139 | /* sendmsg() to netlink socket then recvmsg(). */ | |
1140 | int | |
1141 | netlink_talk (struct nlmsghdr *n, struct nlsock *nl) | |
1142 | { | |
1143 | int status; | |
1144 | struct sockaddr_nl snl; | |
7021c425 | 1145 | struct iovec iov = { (void *) n, n->nlmsg_len }; |
1146 | struct msghdr msg = { (void *) &snl, sizeof snl, &iov, 1, NULL, 0, 0 }; | |
718e3744 | 1147 | int flags = 0; |
5f37d86f | 1148 | int snb_ret; |
7021c425 | 1149 | |
718e3744 | 1150 | memset (&snl, 0, sizeof snl); |
1151 | snl.nl_family = AF_NETLINK; | |
7021c425 | 1152 | |
718e3744 | 1153 | n->nlmsg_seq = ++netlink_cmd.seq; |
1154 | ||
1155 | /* Request an acknowledgement by setting NLM_F_ACK */ | |
1156 | n->nlmsg_flags |= NLM_F_ACK; | |
7021c425 | 1157 | |
1158 | if (IS_ZEBRA_DEBUG_KERNEL) | |
718e3744 | 1159 | zlog_info ("netlink_talk: %s type %s(%u), seq=%u", netlink_cmd.name, |
7021c425 | 1160 | lookup (nlmsg_str, n->nlmsg_type), n->nlmsg_type, |
1161 | n->nlmsg_seq); | |
718e3744 | 1162 | |
1163 | /* Send message to netlink interface. */ | |
7021c425 | 1164 | if (zserv_privs.change (ZPRIVS_RAISE)) |
1165 | zlog (NULL, LOG_ERR, "Can't raise privileges"); | |
718e3744 | 1166 | status = sendmsg (nl->sock, &msg, 0); |
7021c425 | 1167 | if (zserv_privs.change (ZPRIVS_LOWER)) |
1168 | zlog (NULL, LOG_ERR, "Can't lower privileges"); | |
1169 | ||
718e3744 | 1170 | if (status < 0) |
1171 | { | |
1172 | zlog (NULL, LOG_ERR, "netlink_talk sendmsg() error: %s", | |
7021c425 | 1173 | strerror (errno)); |
718e3744 | 1174 | return -1; |
1175 | } | |
7021c425 | 1176 | |
718e3744 | 1177 | /* |
1178 | * Change socket flags for blocking I/O. | |
1179 | * This ensures we wait for a reply in netlink_parse_info(). | |
1180 | */ | |
7021c425 | 1181 | snb_ret = set_netlink_blocking (nl, &flags); |
1182 | if (snb_ret < 0) | |
1183 | zlog (NULL, LOG_WARNING, | |
1184 | "%s:%i Warning: Could not set netlink socket to blocking.", | |
1185 | __FUNCTION__, __LINE__); | |
718e3744 | 1186 | |
1187 | /* | |
1188 | * Get reply from netlink socket. | |
1189 | * The reply should either be an acknowlegement or an error. | |
1190 | */ | |
1191 | status = netlink_parse_info (netlink_talk_filter, nl); | |
7021c425 | 1192 | |
718e3744 | 1193 | /* Restore socket flags for nonblocking I/O */ |
7021c425 | 1194 | if (snb_ret == 0) |
1195 | set_netlink_nonblocking (nl, &flags); | |
1196 | ||
718e3744 | 1197 | return status; |
1198 | } | |
1199 | ||
1200 | /* Routing table change via netlink interface. */ | |
1201 | int | |
1202 | netlink_route (int cmd, int family, void *dest, int length, void *gate, | |
7021c425 | 1203 | int index, int zebra_flags, int table) |
718e3744 | 1204 | { |
1205 | int ret; | |
1206 | int bytelen; | |
1207 | struct sockaddr_nl snl; | |
1208 | int discard; | |
1209 | ||
7021c425 | 1210 | struct |
718e3744 | 1211 | { |
1212 | struct nlmsghdr n; | |
1213 | struct rtmsg r; | |
1214 | char buf[1024]; | |
1215 | } req; | |
1216 | ||
1217 | memset (&req, 0, sizeof req); | |
1218 | ||
1219 | bytelen = (family == AF_INET ? 4 : 16); | |
1220 | ||
1221 | req.n.nlmsg_len = NLMSG_LENGTH (sizeof (struct rtmsg)); | |
1222 | req.n.nlmsg_flags = NLM_F_CREATE | NLM_F_REQUEST; | |
1223 | req.n.nlmsg_type = cmd; | |
1224 | req.r.rtm_family = family; | |
1225 | req.r.rtm_table = table; | |
1226 | req.r.rtm_dst_len = length; | |
1227 | ||
81dfcaa2 | 1228 | if ((zebra_flags & ZEBRA_FLAG_BLACKHOLE) |
1229 | || (zebra_flags & ZEBRA_FLAG_REJECT)) | |
718e3744 | 1230 | discard = 1; |
1231 | else | |
1232 | discard = 0; | |
1233 | ||
7021c425 | 1234 | if (cmd == RTM_NEWROUTE) |
718e3744 | 1235 | { |
1236 | req.r.rtm_protocol = RTPROT_ZEBRA; | |
1237 | req.r.rtm_scope = RT_SCOPE_UNIVERSE; | |
1238 | ||
7021c425 | 1239 | if (discard) |
595db7f1 | 1240 | { |
1241 | if (zebra_flags & ZEBRA_FLAG_BLACKHOLE) | |
1242 | req.r.rtm_type = RTN_BLACKHOLE; | |
1243 | else if (zebra_flags & ZEBRA_FLAG_REJECT) | |
1244 | req.r.rtm_type = RTN_UNREACHABLE; | |
7021c425 | 1245 | else |
1246 | assert (RTN_BLACKHOLE != RTN_UNREACHABLE); /* false */ | |
1247 | } | |
595db7f1 | 1248 | else |
7021c425 | 1249 | req.r.rtm_type = RTN_UNICAST; |
718e3744 | 1250 | } |
1251 | ||
1252 | if (dest) | |
1253 | addattr_l (&req.n, sizeof req, RTA_DST, dest, bytelen); | |
1254 | ||
7021c425 | 1255 | if (!discard) |
718e3744 | 1256 | { |
1257 | if (gate) | |
7021c425 | 1258 | addattr_l (&req.n, sizeof req, RTA_GATEWAY, gate, bytelen); |
718e3744 | 1259 | if (index > 0) |
7021c425 | 1260 | addattr32 (&req.n, sizeof req, RTA_OIF, index); |
718e3744 | 1261 | } |
1262 | ||
1263 | /* Destination netlink address. */ | |
1264 | memset (&snl, 0, sizeof snl); | |
1265 | snl.nl_family = AF_NETLINK; | |
1266 | ||
1267 | /* Talk to netlink socket. */ | |
1268 | ret = netlink_talk (&req.n, &netlink); | |
1269 | if (ret < 0) | |
1270 | return -1; | |
1271 | ||
1272 | return 0; | |
1273 | } | |
1274 | ||
1275 | /* Routing table change via netlink interface. */ | |
1276 | int | |
1277 | netlink_route_multipath (int cmd, struct prefix *p, struct rib *rib, | |
7021c425 | 1278 | int family) |
718e3744 | 1279 | { |
1280 | int bytelen; | |
1281 | struct sockaddr_nl snl; | |
1282 | struct nexthop *nexthop = NULL; | |
1283 | int nexthop_num = 0; | |
1284 | struct nlsock *nl; | |
1285 | int discard; | |
1286 | ||
7021c425 | 1287 | struct |
718e3744 | 1288 | { |
1289 | struct nlmsghdr n; | |
1290 | struct rtmsg r; | |
1291 | char buf[1024]; | |
1292 | } req; | |
1293 | ||
1294 | memset (&req, 0, sizeof req); | |
1295 | ||
1296 | bytelen = (family == AF_INET ? 4 : 16); | |
1297 | ||
1298 | req.n.nlmsg_len = NLMSG_LENGTH (sizeof (struct rtmsg)); | |
1299 | req.n.nlmsg_flags = NLM_F_CREATE | NLM_F_REQUEST; | |
1300 | req.n.nlmsg_type = cmd; | |
1301 | req.r.rtm_family = family; | |
1302 | req.r.rtm_table = rib->table; | |
1303 | req.r.rtm_dst_len = p->prefixlen; | |
1304 | ||
13766da4 | 1305 | #ifdef RTM_F_EQUALIZE |
1306 | req.r.rtm_flags |= RTM_F_EQUALIZE; | |
1307 | #endif /* RTM_F_EQUALIZE */ | |
1308 | ||
7021c425 | 1309 | if ((rib->flags & ZEBRA_FLAG_BLACKHOLE) || (rib->flags & ZEBRA_FLAG_REJECT)) |
718e3744 | 1310 | discard = 1; |
1311 | else | |
1312 | discard = 0; | |
1313 | ||
7021c425 | 1314 | if (cmd == RTM_NEWROUTE) |
718e3744 | 1315 | { |
1316 | req.r.rtm_protocol = RTPROT_ZEBRA; | |
1317 | req.r.rtm_scope = RT_SCOPE_UNIVERSE; | |
1318 | ||
7021c425 | 1319 | if (discard) |
595db7f1 | 1320 | { |
1321 | if (rib->flags & ZEBRA_FLAG_BLACKHOLE) | |
1322 | req.r.rtm_type = RTN_BLACKHOLE; | |
1323 | else if (rib->flags & ZEBRA_FLAG_REJECT) | |
1324 | req.r.rtm_type = RTN_UNREACHABLE; | |
7021c425 | 1325 | else |
1326 | assert (RTN_BLACKHOLE != RTN_UNREACHABLE); /* false */ | |
1327 | } | |
595db7f1 | 1328 | else |
7021c425 | 1329 | req.r.rtm_type = RTN_UNICAST; |
718e3744 | 1330 | } |
1331 | ||
1332 | addattr_l (&req.n, sizeof req, RTA_DST, &p->u.prefix, bytelen); | |
1333 | ||
1334 | /* Metric. */ | |
1335 | addattr32 (&req.n, sizeof req, RTA_PRIORITY, rib->metric); | |
1336 | ||
1337 | if (discard) | |
1338 | { | |
1339 | if (cmd == RTM_NEWROUTE) | |
7021c425 | 1340 | for (nexthop = rib->nexthop; nexthop; nexthop = nexthop->next) |
1341 | SET_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB); | |
718e3744 | 1342 | goto skip; |
1343 | } | |
1344 | ||
1345 | /* Multipath case. */ | |
1346 | if (rib->nexthop_active_num == 1 || MULTIPATH_NUM == 1) | |
1347 | { | |
1348 | for (nexthop = rib->nexthop; nexthop; nexthop = nexthop->next) | |
7021c425 | 1349 | { |
1350 | ||
1351 | if ((cmd == RTM_NEWROUTE | |
1352 | && CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_ACTIVE)) | |
1353 | || (cmd == RTM_DELROUTE | |
1354 | && CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB))) | |
1355 | { | |
1356 | ||
1357 | if (CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_RECURSIVE)) | |
1358 | { | |
1359 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1360 | { | |
1361 | zlog_info | |
1362 | ("netlink_route_multipath() (recursive, 1 hop): " | |
1363 | "%s %s/%d via %s if %u, type %s", | |
1364 | lookup (nlmsg_str, cmd), inet_ntoa (p->u.prefix4), | |
1365 | p->prefixlen, inet_ntoa (nexthop->rgate.ipv4), | |
1366 | nexthop->rifindex, | |
1367 | nexthop_types_desc[nexthop->rtype]); | |
1368 | } | |
1369 | ||
1370 | if (nexthop->rtype == NEXTHOP_TYPE_IPV4 | |
1371 | || nexthop->rtype == NEXTHOP_TYPE_IPV4_IFINDEX) | |
1372 | addattr_l (&req.n, sizeof req, RTA_GATEWAY, | |
1373 | &nexthop->rgate.ipv4, bytelen); | |
718e3744 | 1374 | #ifdef HAVE_IPV6 |
7021c425 | 1375 | if (nexthop->rtype == NEXTHOP_TYPE_IPV6 |
1376 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFINDEX | |
1377 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFNAME) | |
1378 | addattr_l (&req.n, sizeof req, RTA_GATEWAY, | |
1379 | &nexthop->rgate.ipv6, bytelen); | |
718e3744 | 1380 | #endif /* HAVE_IPV6 */ |
7021c425 | 1381 | if (nexthop->rtype == NEXTHOP_TYPE_IFINDEX |
1382 | || nexthop->rtype == NEXTHOP_TYPE_IFNAME | |
1383 | || nexthop->rtype == NEXTHOP_TYPE_IPV4_IFINDEX | |
1384 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFINDEX | |
1385 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFNAME) | |
1386 | addattr32 (&req.n, sizeof req, RTA_OIF, | |
1387 | nexthop->rifindex); | |
1388 | } | |
1389 | else | |
1390 | { | |
1391 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1392 | { | |
1393 | zlog_info | |
1394 | ("netlink_route_multipath(): (single hop)" | |
1395 | "%s %s/%d via %s if %u, type %s", | |
1396 | lookup (nlmsg_str, cmd), inet_ntoa (p->u.prefix4), | |
1397 | p->prefixlen, inet_ntoa (nexthop->gate.ipv4), | |
1398 | nexthop->ifindex, | |
1399 | nexthop_types_desc[nexthop->type]); | |
1400 | } | |
1401 | ||
1402 | if (nexthop->type == NEXTHOP_TYPE_IPV4 | |
1403 | || nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX) | |
1404 | addattr_l (&req.n, sizeof req, RTA_GATEWAY, | |
1405 | &nexthop->gate.ipv4, bytelen); | |
718e3744 | 1406 | #ifdef HAVE_IPV6 |
7021c425 | 1407 | if (nexthop->type == NEXTHOP_TYPE_IPV6 |
1408 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFNAME | |
1409 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX) | |
1410 | addattr_l (&req.n, sizeof req, RTA_GATEWAY, | |
1411 | &nexthop->gate.ipv6, bytelen); | |
718e3744 | 1412 | #endif /* HAVE_IPV6 */ |
7021c425 | 1413 | if (nexthop->type == NEXTHOP_TYPE_IFINDEX |
1414 | || nexthop->type == NEXTHOP_TYPE_IFNAME | |
1415 | || nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX | |
1416 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX | |
1417 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFNAME) | |
1418 | addattr32 (&req.n, sizeof req, RTA_OIF, nexthop->ifindex); | |
1419 | } | |
1420 | ||
1421 | if (cmd == RTM_NEWROUTE) | |
1422 | SET_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB); | |
1423 | ||
1424 | nexthop_num++; | |
1425 | break; | |
1426 | } | |
1427 | } | |
718e3744 | 1428 | } |
1429 | else | |
1430 | { | |
1431 | char buf[1024]; | |
1432 | struct rtattr *rta = (void *) buf; | |
1433 | struct rtnexthop *rtnh; | |
1434 | ||
1435 | rta->rta_type = RTA_MULTIPATH; | |
7021c425 | 1436 | rta->rta_len = RTA_LENGTH (0); |
1437 | rtnh = RTA_DATA (rta); | |
718e3744 | 1438 | |
1439 | nexthop_num = 0; | |
1440 | for (nexthop = rib->nexthop; | |
7021c425 | 1441 | nexthop && (MULTIPATH_NUM == 0 || nexthop_num < MULTIPATH_NUM); |
1442 | nexthop = nexthop->next) | |
1443 | { | |
1444 | if ((cmd == RTM_NEWROUTE | |
1445 | && CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_ACTIVE)) | |
1446 | || (cmd == RTM_DELROUTE | |
1447 | && CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB))) | |
1448 | { | |
1449 | nexthop_num++; | |
1450 | ||
1451 | rtnh->rtnh_len = sizeof (*rtnh); | |
1452 | rtnh->rtnh_flags = 0; | |
1453 | rtnh->rtnh_hops = 0; | |
1454 | rta->rta_len += rtnh->rtnh_len; | |
1455 | ||
1456 | if (CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_RECURSIVE)) | |
1457 | { | |
1458 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1459 | { | |
1460 | zlog_info ("netlink_route_multipath() " | |
1461 | "(recursive, multihop): " | |
1462 | "%s %s/%d via %s if %u, type %s", | |
1463 | lookup (nlmsg_str, cmd), inet_ntoa (p->u.prefix4), | |
1464 | p->prefixlen, inet_ntoa (nexthop->rgate.ipv4), | |
1465 | nexthop->rifindex, | |
1466 | nexthop_types_desc[nexthop->type]); | |
1467 | } | |
1468 | if (nexthop->rtype == NEXTHOP_TYPE_IPV4 | |
1469 | || nexthop->rtype == NEXTHOP_TYPE_IPV4_IFINDEX) | |
1470 | { | |
1471 | rta_addattr_l (rta, 4096, RTA_GATEWAY, | |
1472 | &nexthop->rgate.ipv4, bytelen); | |
1473 | rtnh->rtnh_len += sizeof (struct rtattr) + 4; | |
1474 | } | |
718e3744 | 1475 | #ifdef HAVE_IPV6 |
7021c425 | 1476 | if (nexthop->rtype == NEXTHOP_TYPE_IPV6 |
1477 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFNAME | |
1478 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFINDEX) | |
1479 | rta_addattr_l (rta, 4096, RTA_GATEWAY, | |
1480 | &nexthop->rgate.ipv6, bytelen); | |
718e3744 | 1481 | #endif /* HAVE_IPV6 */ |
7021c425 | 1482 | /* ifindex */ |
1483 | if (nexthop->rtype == NEXTHOP_TYPE_IFINDEX | |
1484 | || nexthop->rtype == NEXTHOP_TYPE_IFNAME | |
1485 | || nexthop->rtype == NEXTHOP_TYPE_IPV4_IFINDEX | |
1486 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFINDEX | |
1487 | || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFNAME) | |
1488 | rtnh->rtnh_ifindex = nexthop->rifindex; | |
1489 | else | |
1490 | rtnh->rtnh_ifindex = 0; | |
1491 | } | |
1492 | else | |
1493 | { | |
1494 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1495 | { | |
1496 | zlog_info ("netlink_route_multipath() " | |
1497 | "(multihop): " | |
1498 | "%s %s/%d via %s if %u, type %s", | |
1499 | lookup (nlmsg_str, cmd), inet_ntoa (p->u.prefix4), | |
1500 | p->prefixlen, inet_ntoa (nexthop->rgate.ipv4), | |
1501 | nexthop->rifindex, | |
1502 | nexthop_types_desc[nexthop->type]); | |
1503 | } | |
1504 | if (nexthop->type == NEXTHOP_TYPE_IPV4 | |
1505 | || nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX) | |
1506 | { | |
1507 | rta_addattr_l (rta, 4096, RTA_GATEWAY, | |
1508 | &nexthop->gate.ipv4, bytelen); | |
1509 | rtnh->rtnh_len += sizeof (struct rtattr) + 4; | |
1510 | } | |
718e3744 | 1511 | #ifdef HAVE_IPV6 |
7021c425 | 1512 | if (nexthop->type == NEXTHOP_TYPE_IPV6 |
1513 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFNAME | |
1514 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX) | |
1515 | rta_addattr_l (rta, 4096, RTA_GATEWAY, | |
1516 | &nexthop->gate.ipv6, bytelen); | |
718e3744 | 1517 | #endif /* HAVE_IPV6 */ |
7021c425 | 1518 | /* ifindex */ |
1519 | if (nexthop->type == NEXTHOP_TYPE_IFINDEX | |
1520 | || nexthop->type == NEXTHOP_TYPE_IFNAME | |
1521 | || nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX | |
1522 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFNAME | |
1523 | || nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX) | |
1524 | rtnh->rtnh_ifindex = nexthop->ifindex; | |
1525 | else | |
1526 | rtnh->rtnh_ifindex = 0; | |
1527 | } | |
1528 | rtnh = RTNH_NEXT (rtnh); | |
1529 | ||
1530 | if (cmd == RTM_NEWROUTE) | |
1531 | SET_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB); | |
1532 | } | |
1533 | } | |
718e3744 | 1534 | |
1535 | if (rta->rta_len > RTA_LENGTH (0)) | |
7021c425 | 1536 | addattr_l (&req.n, 1024, RTA_MULTIPATH, RTA_DATA (rta), |
1537 | RTA_PAYLOAD (rta)); | |
718e3744 | 1538 | } |
1539 | ||
1540 | /* If there is no useful nexthop then return. */ | |
1541 | if (nexthop_num == 0) | |
1542 | { | |
1543 | if (IS_ZEBRA_DEBUG_KERNEL) | |
7021c425 | 1544 | zlog_info ("netlink_route_multipath(): No useful nexthop."); |
718e3744 | 1545 | return 0; |
1546 | } | |
1547 | ||
7021c425 | 1548 | skip: |
718e3744 | 1549 | |
1550 | /* Destination netlink address. */ | |
1551 | memset (&snl, 0, sizeof snl); | |
1552 | snl.nl_family = AF_NETLINK; | |
1553 | ||
1554 | if (family == AF_INET) | |
1555 | nl = &netlink_cmd; | |
1556 | else | |
1557 | nl = &netlink; | |
1558 | ||
1559 | /* Talk to netlink socket. */ | |
1560 | return netlink_talk (&req.n, nl); | |
1561 | } | |
1562 | ||
1563 | int | |
1564 | kernel_add_ipv4 (struct prefix *p, struct rib *rib) | |
1565 | { | |
1566 | return netlink_route_multipath (RTM_NEWROUTE, p, rib, AF_INET); | |
1567 | } | |
1568 | ||
1569 | int | |
1570 | kernel_delete_ipv4 (struct prefix *p, struct rib *rib) | |
1571 | { | |
1572 | return netlink_route_multipath (RTM_DELROUTE, p, rib, AF_INET); | |
1573 | } | |
1574 | ||
1575 | #ifdef HAVE_IPV6 | |
1576 | int | |
1577 | kernel_add_ipv6 (struct prefix *p, struct rib *rib) | |
1578 | { | |
1579 | return netlink_route_multipath (RTM_NEWROUTE, p, rib, AF_INET6); | |
1580 | } | |
1581 | ||
1582 | int | |
1583 | kernel_delete_ipv6 (struct prefix *p, struct rib *rib) | |
1584 | { | |
1585 | return netlink_route_multipath (RTM_DELROUTE, p, rib, AF_INET6); | |
1586 | } | |
1587 | ||
1588 | /* Delete IPv6 route from the kernel. */ | |
1589 | int | |
1590 | kernel_delete_ipv6_old (struct prefix_ipv6 *dest, struct in6_addr *gate, | |
7021c425 | 1591 | int index, int flags, int table) |
718e3744 | 1592 | { |
7021c425 | 1593 | return netlink_route (RTM_DELROUTE, AF_INET6, &dest->prefix, |
1594 | dest->prefixlen, gate, index, flags, table); | |
718e3744 | 1595 | } |
1596 | #endif /* HAVE_IPV6 */ | |
1597 | \f | |
1598 | /* Interface address modification. */ | |
1599 | int | |
1600 | netlink_address (int cmd, int family, struct interface *ifp, | |
7021c425 | 1601 | struct connected *ifc) |
718e3744 | 1602 | { |
1603 | int bytelen; | |
1604 | struct prefix *p; | |
1605 | ||
7021c425 | 1606 | struct |
718e3744 | 1607 | { |
1608 | struct nlmsghdr n; | |
1609 | struct ifaddrmsg ifa; | |
1610 | char buf[1024]; | |
1611 | } req; | |
1612 | ||
1613 | p = ifc->address; | |
1614 | memset (&req, 0, sizeof req); | |
1615 | ||
1616 | bytelen = (family == AF_INET ? 4 : 16); | |
1617 | ||
7021c425 | 1618 | req.n.nlmsg_len = NLMSG_LENGTH (sizeof (struct ifaddrmsg)); |
718e3744 | 1619 | req.n.nlmsg_flags = NLM_F_REQUEST; |
1620 | req.n.nlmsg_type = cmd; | |
1621 | req.ifa.ifa_family = family; | |
1622 | ||
1623 | req.ifa.ifa_index = ifp->ifindex; | |
1624 | req.ifa.ifa_prefixlen = p->prefixlen; | |
1625 | ||
1626 | addattr_l (&req.n, sizeof req, IFA_LOCAL, &p->u.prefix, bytelen); | |
1627 | ||
1628 | if (family == AF_INET && cmd == RTM_NEWADDR) | |
1629 | { | |
1630 | if (if_is_broadcast (ifp) && ifc->destination) | |
7021c425 | 1631 | { |
1632 | p = ifc->destination; | |
1633 | addattr_l (&req.n, sizeof req, IFA_BROADCAST, &p->u.prefix, | |
1634 | bytelen); | |
1635 | } | |
718e3744 | 1636 | } |
1637 | ||
1638 | if (CHECK_FLAG (ifc->flags, ZEBRA_IFA_SECONDARY)) | |
1639 | SET_FLAG (req.ifa.ifa_flags, IFA_F_SECONDARY); | |
7021c425 | 1640 | |
718e3744 | 1641 | if (ifc->label) |
1642 | addattr_l (&req.n, sizeof req, IFA_LABEL, ifc->label, | |
7021c425 | 1643 | strlen (ifc->label) + 1); |
718e3744 | 1644 | |
1645 | return netlink_talk (&req.n, &netlink_cmd); | |
1646 | } | |
1647 | ||
1648 | int | |
1649 | kernel_address_add_ipv4 (struct interface *ifp, struct connected *ifc) | |
1650 | { | |
1651 | return netlink_address (RTM_NEWADDR, AF_INET, ifp, ifc); | |
1652 | } | |
1653 | ||
1654 | int | |
1655 | kernel_address_delete_ipv4 (struct interface *ifp, struct connected *ifc) | |
1656 | { | |
1657 | return netlink_address (RTM_DELADDR, AF_INET, ifp, ifc); | |
1658 | } | |
1659 | ||
718e3744 | 1660 | |
1661 | extern struct thread_master *master; | |
1662 | ||
1663 | /* Kernel route reflection. */ | |
1664 | int | |
1665 | kernel_read (struct thread *thread) | |
1666 | { | |
1667 | int ret; | |
1668 | int sock; | |
1669 | ||
1670 | sock = THREAD_FD (thread); | |
1671 | ret = netlink_parse_info (netlink_information_fetch, &netlink); | |
b21b19c5 | 1672 | thread_add_read (zebrad.master, kernel_read, NULL, netlink.sock); |
718e3744 | 1673 | |
1674 | return 0; | |
1675 | } | |
1676 | ||
1677 | /* Exported interface function. This function simply calls | |
1678 | netlink_socket (). */ | |
1679 | void | |
1680 | kernel_init () | |
1681 | { | |
1682 | unsigned long groups; | |
1683 | ||
7021c425 | 1684 | groups = RTMGRP_LINK | RTMGRP_IPV4_ROUTE | RTMGRP_IPV4_IFADDR; |
718e3744 | 1685 | #ifdef HAVE_IPV6 |
7021c425 | 1686 | groups |= RTMGRP_IPV6_ROUTE | RTMGRP_IPV6_IFADDR; |
718e3744 | 1687 | #endif /* HAVE_IPV6 */ |
1688 | netlink_socket (&netlink, groups); | |
1689 | netlink_socket (&netlink_cmd, 0); | |
1690 | ||
1691 | /* Register kernel socket. */ | |
1692 | if (netlink.sock > 0) | |
b21b19c5 | 1693 | thread_add_read (zebrad.master, kernel_read, NULL, netlink.sock); |
718e3744 | 1694 | } |