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718e3744 | 1 | /* Zebra's client library. |
2 | * Copyright (C) 1999 Kunihiro Ishiguro | |
634f9ea2 | 3 | * Copyright (C) 2005 Andrew J. Schorr |
718e3744 | 4 | * |
5 | * This file is part of GNU Zebra. | |
6 | * | |
7 | * GNU Zebra is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published | |
9 | * by the Free Software Foundation; either version 2, or (at your | |
10 | * option) any later version. | |
11 | * | |
12 | * GNU Zebra is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with GNU Zebra; see the file COPYING. If not, write to the | |
19 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, | |
20 | * MA 02111-1307, USA. | |
21 | */ | |
22 | ||
23 | #include <zebra.h> | |
24 | ||
25 | #include "prefix.h" | |
26 | #include "stream.h" | |
634f9ea2 | 27 | #include "buffer.h" |
718e3744 | 28 | #include "network.h" |
29 | #include "if.h" | |
30 | #include "log.h" | |
31 | #include "thread.h" | |
32 | #include "zclient.h" | |
33 | #include "memory.h" | |
34 | #include "table.h" | |
718e3744 | 35 | \f |
36 | /* Zebra client events. */ | |
37 | enum event {ZCLIENT_SCHEDULE, ZCLIENT_READ, ZCLIENT_CONNECT}; | |
38 | ||
39 | /* Prototype for event manager. */ | |
40 | static void zclient_event (enum event, struct zclient *); | |
41 | ||
634f9ea2 | 42 | extern struct thread_master *master; |
43 | ||
718e3744 | 44 | /* This file local debug flag. */ |
45 | int zclient_debug = 0; | |
46 | \f | |
47 | /* Allocate zclient structure. */ | |
48 | struct zclient * | |
49 | zclient_new () | |
50 | { | |
51 | struct zclient *zclient; | |
52 | zclient = XMALLOC (MTYPE_ZCLIENT, sizeof (struct zclient)); | |
53 | memset (zclient, 0, sizeof (struct zclient)); | |
54 | ||
55 | zclient->ibuf = stream_new (ZEBRA_MAX_PACKET_SIZ); | |
56 | zclient->obuf = stream_new (ZEBRA_MAX_PACKET_SIZ); | |
634f9ea2 | 57 | zclient->wb = buffer_new(0); |
718e3744 | 58 | |
59 | return zclient; | |
60 | } | |
61 | ||
634f9ea2 | 62 | #if 0 |
63 | /* This function is never used. And it must not be used, because | |
64 | many parts of the code do not check for I/O errors, so they could | |
65 | reference an invalid pointer if the structure was ever freed. | |
66 | */ | |
67 | ||
718e3744 | 68 | /* Free zclient structure. */ |
69 | void | |
70 | zclient_free (struct zclient *zclient) | |
71 | { | |
634f9ea2 | 72 | if (zclient->ibuf) |
73 | stream_free(zclient->ibuf); | |
74 | if (zclient->obuf) | |
75 | stream_free(zclient->obuf); | |
76 | if (zclient->wb) | |
77 | buffer_free(zclient->wb); | |
78 | ||
718e3744 | 79 | XFREE (MTYPE_ZCLIENT, zclient); |
80 | } | |
634f9ea2 | 81 | #endif |
718e3744 | 82 | |
83 | /* Initialize zebra client. Argument redist_default is unwanted | |
84 | redistribute route type. */ | |
85 | void | |
86 | zclient_init (struct zclient *zclient, int redist_default) | |
87 | { | |
88 | int i; | |
89 | ||
90 | /* Enable zebra client connection by default. */ | |
91 | zclient->enable = 1; | |
92 | ||
93 | /* Set -1 to the default socket value. */ | |
94 | zclient->sock = -1; | |
95 | ||
96 | /* Clear redistribution flags. */ | |
97 | for (i = 0; i < ZEBRA_ROUTE_MAX; i++) | |
98 | zclient->redist[i] = 0; | |
99 | ||
100 | /* Set unwanted redistribute route. bgpd does not need BGP route | |
101 | redistribution. */ | |
102 | zclient->redist_default = redist_default; | |
103 | zclient->redist[redist_default] = 1; | |
104 | ||
105 | /* Set default-information redistribute to zero. */ | |
106 | zclient->default_information = 0; | |
107 | ||
108 | /* Schedule first zclient connection. */ | |
109 | if (zclient_debug) | |
8ddca704 | 110 | zlog_debug ("zclient start scheduled"); |
718e3744 | 111 | |
112 | zclient_event (ZCLIENT_SCHEDULE, zclient); | |
113 | } | |
114 | ||
115 | /* Stop zebra client services. */ | |
116 | void | |
117 | zclient_stop (struct zclient *zclient) | |
118 | { | |
119 | if (zclient_debug) | |
8ddca704 | 120 | zlog_debug ("zclient stopped"); |
718e3744 | 121 | |
122 | /* Stop threads. */ | |
634f9ea2 | 123 | THREAD_OFF(zclient->t_read); |
124 | THREAD_OFF(zclient->t_connect); | |
125 | THREAD_OFF(zclient->t_write); | |
126 | ||
127 | /* Reset streams. */ | |
128 | stream_reset(zclient->ibuf); | |
129 | stream_reset(zclient->obuf); | |
130 | ||
131 | /* Empty the write buffer. */ | |
132 | buffer_reset(zclient->wb); | |
718e3744 | 133 | |
134 | /* Close socket. */ | |
135 | if (zclient->sock >= 0) | |
136 | { | |
137 | close (zclient->sock); | |
138 | zclient->sock = -1; | |
139 | } | |
140 | zclient->fail = 0; | |
141 | } | |
142 | ||
143 | void | |
144 | zclient_reset (struct zclient *zclient) | |
145 | { | |
146 | zclient_stop (zclient); | |
147 | zclient_init (zclient, zclient->redist_default); | |
148 | } | |
149 | ||
150 | /* Make socket to zebra daemon. Return zebra socket. */ | |
151 | int | |
634f9ea2 | 152 | zclient_socket(void) |
718e3744 | 153 | { |
154 | int sock; | |
155 | int ret; | |
156 | struct sockaddr_in serv; | |
157 | ||
158 | /* We should think about IPv6 connection. */ | |
159 | sock = socket (AF_INET, SOCK_STREAM, 0); | |
160 | if (sock < 0) | |
161 | return -1; | |
162 | ||
163 | /* Make server socket. */ | |
164 | memset (&serv, 0, sizeof (struct sockaddr_in)); | |
165 | serv.sin_family = AF_INET; | |
166 | serv.sin_port = htons (ZEBRA_PORT); | |
167 | #ifdef HAVE_SIN_LEN | |
168 | serv.sin_len = sizeof (struct sockaddr_in); | |
169 | #endif /* HAVE_SIN_LEN */ | |
170 | serv.sin_addr.s_addr = htonl (INADDR_LOOPBACK); | |
171 | ||
172 | /* Connect to zebra. */ | |
173 | ret = connect (sock, (struct sockaddr *) &serv, sizeof (serv)); | |
174 | if (ret < 0) | |
175 | { | |
176 | close (sock); | |
177 | return -1; | |
178 | } | |
179 | return sock; | |
180 | } | |
181 | ||
182 | /* For sockaddr_un. */ | |
183 | #include <sys/un.h> | |
184 | ||
185 | int | |
8c328f11 | 186 | zclient_socket_un (const char *path) |
718e3744 | 187 | { |
188 | int ret; | |
189 | int sock, len; | |
190 | struct sockaddr_un addr; | |
191 | ||
192 | sock = socket (AF_UNIX, SOCK_STREAM, 0); | |
193 | if (sock < 0) | |
194 | return -1; | |
195 | ||
196 | /* Make server socket. */ | |
197 | memset (&addr, 0, sizeof (struct sockaddr_un)); | |
198 | addr.sun_family = AF_UNIX; | |
199 | strncpy (addr.sun_path, path, strlen (path)); | |
200 | #ifdef HAVE_SUN_LEN | |
201 | len = addr.sun_len = SUN_LEN(&addr); | |
202 | #else | |
203 | len = sizeof (addr.sun_family) + strlen (addr.sun_path); | |
204 | #endif /* HAVE_SUN_LEN */ | |
205 | ||
206 | ret = connect (sock, (struct sockaddr *) &addr, len); | |
207 | if (ret < 0) | |
208 | { | |
209 | close (sock); | |
210 | return -1; | |
211 | } | |
212 | return sock; | |
213 | } | |
214 | ||
634f9ea2 | 215 | static int |
216 | zclient_failed(struct zclient *zclient) | |
217 | { | |
218 | zclient->fail++; | |
219 | zclient_stop(zclient); | |
220 | zclient_event(ZCLIENT_CONNECT, zclient); | |
221 | return -1; | |
222 | } | |
223 | ||
224 | static int | |
225 | zclient_flush_data(struct thread *thread) | |
226 | { | |
227 | struct zclient *zclient = THREAD_ARG(thread); | |
228 | ||
229 | zclient->t_write = NULL; | |
230 | if (zclient->sock < 0) | |
231 | return -1; | |
232 | switch (buffer_flush_available(zclient->wb, zclient->sock)) | |
233 | { | |
234 | case BUFFER_ERROR: | |
235 | zlog_warn("%s: buffer_flush_available failed on zclient fd %d, closing", | |
236 | __func__, zclient->sock); | |
237 | return zclient_failed(zclient); | |
238 | break; | |
239 | case BUFFER_PENDING: | |
240 | zclient->t_write = thread_add_write(master, zclient_flush_data, | |
241 | zclient, zclient->sock); | |
242 | break; | |
243 | case BUFFER_EMPTY: | |
244 | break; | |
245 | } | |
246 | return 0; | |
247 | } | |
248 | ||
718e3744 | 249 | int |
634f9ea2 | 250 | zclient_send_message(struct zclient *zclient) |
251 | { | |
252 | if (zclient->sock < 0) | |
253 | return -1; | |
254 | switch (buffer_write(zclient->wb, zclient->sock, STREAM_DATA(zclient->obuf), | |
255 | stream_get_endp(zclient->obuf))) | |
256 | { | |
257 | case BUFFER_ERROR: | |
258 | zlog_warn("%s: buffer_write failed to zclient fd %d, closing", | |
259 | __func__, zclient->sock); | |
260 | return zclient_failed(zclient); | |
261 | break; | |
262 | case BUFFER_EMPTY: | |
263 | THREAD_OFF(zclient->t_write); | |
264 | break; | |
265 | case BUFFER_PENDING: | |
266 | THREAD_WRITE_ON(master, zclient->t_write, | |
267 | zclient_flush_data, zclient, zclient->sock); | |
268 | break; | |
269 | } | |
270 | return 0; | |
271 | } | |
272 | ||
d211086a | 273 | void |
c1b9800a | 274 | zclient_create_header (struct stream *s, uint16_t command) |
275 | { | |
276 | /* length placeholder, caller can update */ | |
277 | stream_putw (s, ZEBRA_HEADER_SIZE); | |
278 | stream_putc (s, ZEBRA_HEADER_MARKER); | |
279 | stream_putc (s, ZSERV_VERSION); | |
280 | stream_putw (s, command); | |
281 | } | |
282 | ||
634f9ea2 | 283 | /* Send simple Zebra message. */ |
284 | static int | |
718e3744 | 285 | zebra_message_send (struct zclient *zclient, int command) |
286 | { | |
287 | struct stream *s; | |
288 | ||
289 | /* Get zclient output buffer. */ | |
290 | s = zclient->obuf; | |
291 | stream_reset (s); | |
292 | ||
293 | /* Send very simple command only Zebra message. */ | |
c1b9800a | 294 | zclient_create_header (s, command); |
295 | ||
634f9ea2 | 296 | return zclient_send_message(zclient); |
718e3744 | 297 | } |
298 | ||
299 | /* Make connection to zebra daemon. */ | |
300 | int | |
301 | zclient_start (struct zclient *zclient) | |
302 | { | |
303 | int i; | |
304 | ||
305 | if (zclient_debug) | |
8ddca704 | 306 | zlog_debug ("zclient_start is called"); |
718e3744 | 307 | |
308 | /* zclient is disabled. */ | |
309 | if (! zclient->enable) | |
310 | return 0; | |
311 | ||
312 | /* If already connected to the zebra. */ | |
313 | if (zclient->sock >= 0) | |
314 | return 0; | |
315 | ||
316 | /* Check connect thread. */ | |
317 | if (zclient->t_connect) | |
318 | return 0; | |
319 | ||
320 | /* Make socket. */ | |
321 | #ifdef HAVE_TCP_ZEBRA | |
322 | zclient->sock = zclient_socket (); | |
323 | #else | |
324 | zclient->sock = zclient_socket_un (ZEBRA_SERV_PATH); | |
325 | #endif /* HAVE_TCP_ZEBRA */ | |
326 | if (zclient->sock < 0) | |
327 | { | |
328 | if (zclient_debug) | |
8ddca704 | 329 | zlog_debug ("zclient connection fail"); |
718e3744 | 330 | zclient->fail++; |
331 | zclient_event (ZCLIENT_CONNECT, zclient); | |
332 | return -1; | |
333 | } | |
334 | ||
634f9ea2 | 335 | if (set_nonblocking(zclient->sock) < 0) |
336 | zlog_warn("%s: set_nonblocking(%d) failed", __func__, zclient->sock); | |
337 | ||
718e3744 | 338 | /* Clear fail count. */ |
339 | zclient->fail = 0; | |
340 | if (zclient_debug) | |
8ddca704 | 341 | zlog_debug ("zclient connect success with socket [%d]", zclient->sock); |
718e3744 | 342 | |
343 | /* Create read thread. */ | |
344 | zclient_event (ZCLIENT_READ, zclient); | |
345 | ||
346 | /* We need interface information. */ | |
347 | zebra_message_send (zclient, ZEBRA_INTERFACE_ADD); | |
348 | ||
18a6dce6 | 349 | /* We need router-id information. */ |
350 | zebra_message_send (zclient, ZEBRA_ROUTER_ID_ADD); | |
351 | ||
718e3744 | 352 | /* Flush all redistribute request. */ |
353 | for (i = 0; i < ZEBRA_ROUTE_MAX; i++) | |
354 | if (i != zclient->redist_default && zclient->redist[i]) | |
634f9ea2 | 355 | zebra_redistribute_send (ZEBRA_REDISTRIBUTE_ADD, zclient, i); |
718e3744 | 356 | |
357 | /* If default information is needed. */ | |
358 | if (zclient->default_information) | |
359 | zebra_message_send (zclient, ZEBRA_REDISTRIBUTE_DEFAULT_ADD); | |
360 | ||
361 | return 0; | |
362 | } | |
363 | ||
364 | /* This function is a wrapper function for calling zclient_start from | |
365 | timer or event thread. */ | |
634f9ea2 | 366 | static int |
718e3744 | 367 | zclient_connect (struct thread *t) |
368 | { | |
369 | struct zclient *zclient; | |
370 | ||
371 | zclient = THREAD_ARG (t); | |
372 | zclient->t_connect = NULL; | |
373 | ||
374 | if (zclient_debug) | |
8ddca704 | 375 | zlog_debug ("zclient_connect is called"); |
718e3744 | 376 | |
377 | return zclient_start (zclient); | |
378 | } | |
379 | \f | |
0a589359 | 380 | /* |
381 | * "xdr_encode"-like interface that allows daemon (client) to send | |
382 | * a message to zebra server for a route that needs to be | |
383 | * added/deleted to the kernel. Info about the route is specified | |
384 | * by the caller in a struct zapi_ipv4. zapi_ipv4_read() then writes | |
385 | * the info down the zclient socket using the stream_* functions. | |
386 | * | |
387 | * The corresponding read ("xdr_decode") function on the server | |
388 | * side is zread_ipv4_add()/zread_ipv4_delete(). | |
389 | * | |
390 | * 0 1 2 3 4 5 6 7 8 9 A B C D E F 0 1 2 3 4 5 6 7 8 9 A B C D E F | |
391 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
392 | * | Length (2) | Command | Route Type | | |
393 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
394 | * | ZEBRA Flags | Message Flags | Prefix length | | |
395 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
396 | * | Destination IPv4 Prefix for route | | |
397 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
398 | * | Nexthop count | | |
399 | * +-+-+-+-+-+-+-+-+ | |
400 | * | |
401 | * | |
402 | * A number of IPv4 nexthop(s) or nexthop interface index(es) are then | |
403 | * described, as per the Nexthop count. Each nexthop described as: | |
404 | * | |
405 | * +-+-+-+-+-+-+-+-+ | |
406 | * | Nexthop Type | Set to one of ZEBRA_NEXTHOP_* | |
407 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
408 | * | IPv4 Nexthop address or Interface Index number | | |
409 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
410 | * | |
411 | * Alternatively, if the flags field has ZEBRA_FLAG_BLACKHOLE or | |
412 | * ZEBRA_FLAG_REJECT is set then Nexthop count is set to 1, then _no_ | |
413 | * nexthop information is provided, and the message describes a prefix | |
414 | * to blackhole or reject route. | |
415 | * | |
416 | * If ZAPI_MESSAGE_DISTANCE is set, the distance value is written as a 1 | |
417 | * byte value. | |
418 | * | |
419 | * If ZAPI_MESSAGE_METRIC is set, the metric value is written as an 8 | |
420 | * byte value. | |
421 | * | |
422 | * XXX: No attention paid to alignment. | |
423 | */ | |
718e3744 | 424 | int |
0a589359 | 425 | zapi_ipv4_route (u_char cmd, struct zclient *zclient, struct prefix_ipv4 *p, |
426 | struct zapi_ipv4 *api) | |
718e3744 | 427 | { |
428 | int i; | |
429 | int psize; | |
430 | struct stream *s; | |
431 | ||
432 | /* Reset stream. */ | |
433 | s = zclient->obuf; | |
434 | stream_reset (s); | |
c1b9800a | 435 | |
436 | zclient_create_header (s, cmd); | |
437 | ||
438 | /* Put type and nexthop. */ | |
718e3744 | 439 | stream_putc (s, api->type); |
440 | stream_putc (s, api->flags); | |
441 | stream_putc (s, api->message); | |
718e3744 | 442 | |
718e3744 | 443 | /* Put prefix information. */ |
444 | psize = PSIZE (p->prefixlen); | |
445 | stream_putc (s, p->prefixlen); | |
0a589359 | 446 | stream_write (s, (u_char *) & p->prefix, psize); |
718e3744 | 447 | |
448 | /* Nexthop, ifindex, distance and metric information. */ | |
449 | if (CHECK_FLAG (api->message, ZAPI_MESSAGE_NEXTHOP)) | |
450 | { | |
595db7f1 | 451 | if (CHECK_FLAG (api->flags, ZEBRA_FLAG_BLACKHOLE)) |
452 | { | |
453 | stream_putc (s, 1); | |
454 | stream_putc (s, ZEBRA_NEXTHOP_BLACKHOLE); | |
0a589359 | 455 | /* XXX assert(api->nexthop_num == 0); */ |
456 | /* XXX assert(api->ifindex_num == 0); */ | |
595db7f1 | 457 | } |
458 | else | |
459 | stream_putc (s, api->nexthop_num + api->ifindex_num); | |
718e3744 | 460 | |
461 | for (i = 0; i < api->nexthop_num; i++) | |
595db7f1 | 462 | { |
463 | stream_putc (s, ZEBRA_NEXTHOP_IPV4); | |
464 | stream_put_in_addr (s, api->nexthop[i]); | |
465 | } | |
718e3744 | 466 | for (i = 0; i < api->ifindex_num; i++) |
595db7f1 | 467 | { |
468 | stream_putc (s, ZEBRA_NEXTHOP_IFINDEX); | |
469 | stream_putl (s, api->ifindex[i]); | |
470 | } | |
718e3744 | 471 | } |
472 | ||
473 | if (CHECK_FLAG (api->message, ZAPI_MESSAGE_DISTANCE)) | |
474 | stream_putc (s, api->distance); | |
475 | if (CHECK_FLAG (api->message, ZAPI_MESSAGE_METRIC)) | |
476 | stream_putl (s, api->metric); | |
477 | ||
478 | /* Put length at the first point of the stream. */ | |
479 | stream_putw_at (s, 0, stream_get_endp (s)); | |
480 | ||
634f9ea2 | 481 | return zclient_send_message(zclient); |
718e3744 | 482 | } |
483 | ||
484 | #ifdef HAVE_IPV6 | |
485 | int | |
0a589359 | 486 | zapi_ipv6_route (u_char cmd, struct zclient *zclient, struct prefix_ipv6 *p, |
718e3744 | 487 | struct zapi_ipv6 *api) |
488 | { | |
489 | int i; | |
490 | int psize; | |
491 | struct stream *s; | |
492 | ||
493 | /* Reset stream. */ | |
494 | s = zclient->obuf; | |
495 | stream_reset (s); | |
496 | ||
c1b9800a | 497 | zclient_create_header (s, cmd); |
718e3744 | 498 | |
c1b9800a | 499 | /* Put type and nexthop. */ |
718e3744 | 500 | stream_putc (s, api->type); |
501 | stream_putc (s, api->flags); | |
502 | stream_putc (s, api->message); | |
503 | ||
504 | /* Put prefix information. */ | |
505 | psize = PSIZE (p->prefixlen); | |
506 | stream_putc (s, p->prefixlen); | |
507 | stream_write (s, (u_char *)&p->prefix, psize); | |
508 | ||
509 | /* Nexthop, ifindex, distance and metric information. */ | |
510 | if (CHECK_FLAG (api->message, ZAPI_MESSAGE_NEXTHOP)) | |
511 | { | |
512 | stream_putc (s, api->nexthop_num + api->ifindex_num); | |
513 | ||
514 | for (i = 0; i < api->nexthop_num; i++) | |
515 | { | |
516 | stream_putc (s, ZEBRA_NEXTHOP_IPV6); | |
517 | stream_write (s, (u_char *)api->nexthop[i], 16); | |
518 | } | |
519 | for (i = 0; i < api->ifindex_num; i++) | |
520 | { | |
521 | stream_putc (s, ZEBRA_NEXTHOP_IFINDEX); | |
522 | stream_putl (s, api->ifindex[i]); | |
523 | } | |
524 | } | |
525 | ||
526 | if (CHECK_FLAG (api->message, ZAPI_MESSAGE_DISTANCE)) | |
527 | stream_putc (s, api->distance); | |
528 | if (CHECK_FLAG (api->message, ZAPI_MESSAGE_METRIC)) | |
529 | stream_putl (s, api->metric); | |
530 | ||
531 | /* Put length at the first point of the stream. */ | |
532 | stream_putw_at (s, 0, stream_get_endp (s)); | |
533 | ||
634f9ea2 | 534 | return zclient_send_message(zclient); |
718e3744 | 535 | } |
718e3744 | 536 | #endif /* HAVE_IPV6 */ |
537 | ||
0a589359 | 538 | /* |
539 | * send a ZEBRA_REDISTRIBUTE_ADD or ZEBRA_REDISTRIBUTE_DELETE | |
540 | * for the route type (ZEBRA_ROUTE_KERNEL etc.). The zebra server will | |
541 | * then set/unset redist[type] in the client handle (a struct zserv) for the | |
542 | * sending client | |
543 | */ | |
718e3744 | 544 | int |
634f9ea2 | 545 | zebra_redistribute_send (int command, struct zclient *zclient, int type) |
718e3744 | 546 | { |
718e3744 | 547 | struct stream *s; |
548 | ||
634f9ea2 | 549 | s = zclient->obuf; |
550 | stream_reset(s); | |
718e3744 | 551 | |
c1b9800a | 552 | zclient_create_header (s, command); |
718e3744 | 553 | stream_putc (s, type); |
c1b9800a | 554 | |
555 | stream_putw_at (s, 0, stream_get_endp (s)); | |
556 | ||
634f9ea2 | 557 | return zclient_send_message(zclient); |
718e3744 | 558 | } |
559 | ||
18a6dce6 | 560 | /* Router-id update from zebra daemon. */ |
561 | void | |
562 | zebra_router_id_update_read (struct stream *s, struct prefix *rid) | |
563 | { | |
564 | int plen; | |
565 | ||
566 | /* Fetch interface address. */ | |
567 | rid->family = stream_getc (s); | |
568 | ||
569 | plen = prefix_blen (rid); | |
570 | stream_get (&rid->u.prefix, s, plen); | |
571 | rid->prefixlen = stream_getc (s); | |
572 | } | |
573 | ||
718e3744 | 574 | /* Interface addition from zebra daemon. */ |
0a589359 | 575 | /* |
576 | * The format of the message sent with type ZEBRA_INTERFACE_ADD or | |
577 | * ZEBRA_INTERFACE_DELETE from zebra to the client is: | |
578 | * 0 1 2 3 | |
579 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
580 | * +-+-+-+-+-+-+-+-+ | |
581 | * | type | | |
582 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
583 | * | ifname | | |
584 | * | | | |
585 | * | | | |
586 | * | | | |
587 | * | | | |
588 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
589 | * | ifindex | | |
590 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
591 | * | if_flags | | |
c77d4546 | 592 | * | | |
0a589359 | 593 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
594 | * | metric | | |
595 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
596 | * | ifmtu | | |
597 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
598 | * | ifmtu6 | | |
599 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
600 | * | bandwidth | | |
601 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
602 | * | sockaddr_dl | | |
603 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
604 | */ | |
605 | ||
718e3744 | 606 | struct interface * |
607 | zebra_interface_add_read (struct stream *s) | |
608 | { | |
609 | struct interface *ifp; | |
02ff83c5 | 610 | char ifname_tmp[INTERFACE_NAMSIZ]; |
718e3744 | 611 | |
612 | /* Read interface name. */ | |
613 | stream_get (ifname_tmp, s, INTERFACE_NAMSIZ); | |
614 | ||
a349198f | 615 | /* Lookup/create interface by name. */ |
616 | ifp = if_get_by_name_len (ifname_tmp, strnlen(ifname_tmp, INTERFACE_NAMSIZ)); | |
718e3744 | 617 | |
618 | /* Read interface's index. */ | |
619 | ifp->ifindex = stream_getl (s); | |
620 | ||
621 | /* Read interface's value. */ | |
2e3b2e47 | 622 | ifp->status = stream_getc (s); |
c77d4546 | 623 | ifp->flags = stream_getq (s); |
718e3744 | 624 | ifp->metric = stream_getl (s); |
625 | ifp->mtu = stream_getl (s); | |
0a589359 | 626 | ifp->mtu6 = stream_getl (s); |
718e3744 | 627 | ifp->bandwidth = stream_getl (s); |
628 | #ifdef HAVE_SOCKADDR_DL | |
629 | stream_get (&ifp->sdl, s, sizeof (ifp->sdl)); | |
630 | #else | |
631 | ifp->hw_addr_len = stream_getl (s); | |
632 | if (ifp->hw_addr_len) | |
633 | stream_get (ifp->hw_addr, s, ifp->hw_addr_len); | |
634 | #endif /* HAVE_SOCKADDR_DL */ | |
635 | ||
636 | return ifp; | |
637 | } | |
638 | ||
0a589359 | 639 | /* |
640 | * Read interface up/down msg (ZEBRA_INTERFACE_UP/ZEBRA_INTERFACE_DOWN) | |
641 | * from zebra server. The format of this message is the same as | |
642 | * that sent for ZEBRA_INTERFACE_ADD/ZEBRA_INTERFACE_DELETE (see | |
643 | * comments for zebra_interface_add_read), except that no sockaddr_dl | |
644 | * is sent at the tail of the message. | |
645 | */ | |
718e3744 | 646 | struct interface * |
647 | zebra_interface_state_read (struct stream *s) | |
648 | { | |
649 | struct interface *ifp; | |
02ff83c5 | 650 | char ifname_tmp[INTERFACE_NAMSIZ]; |
718e3744 | 651 | |
652 | /* Read interface name. */ | |
653 | stream_get (ifname_tmp, s, INTERFACE_NAMSIZ); | |
654 | ||
655 | /* Lookup this by interface index. */ | |
a349198f | 656 | ifp = if_lookup_by_name_len (ifname_tmp, |
657 | strnlen(ifname_tmp, INTERFACE_NAMSIZ)); | |
718e3744 | 658 | |
659 | /* If such interface does not exist, indicate an error */ | |
660 | if (! ifp) | |
661 | return NULL; | |
662 | ||
663 | /* Read interface's index. */ | |
664 | ifp->ifindex = stream_getl (s); | |
665 | ||
666 | /* Read interface's value. */ | |
2e3b2e47 | 667 | ifp->status = stream_getc (s); |
c77d4546 | 668 | ifp->flags = stream_getq (s); |
718e3744 | 669 | ifp->metric = stream_getl (s); |
670 | ifp->mtu = stream_getl (s); | |
0a589359 | 671 | ifp->mtu6 = stream_getl (s); |
718e3744 | 672 | ifp->bandwidth = stream_getl (s); |
673 | ||
674 | return ifp; | |
675 | } | |
676 | ||
0a589359 | 677 | /* |
678 | * format of message for address additon is: | |
679 | * 0 | |
680 | * 0 1 2 3 4 5 6 7 | |
681 | * +-+-+-+-+-+-+-+-+ | |
682 | * | type | ZEBRA_INTERFACE_ADDRESS_ADD or | |
683 | * +-+-+-+-+-+-+-+-+ ZEBRA_INTERFACE_ADDRES_DELETE | |
684 | * | | | |
685 | * + + | |
686 | * | ifindex | | |
687 | * + + | |
688 | * | | | |
689 | * + + | |
690 | * | | | |
691 | * +-+-+-+-+-+-+-+-+ | |
692 | * | ifc_flags | flags for connected address | |
693 | * +-+-+-+-+-+-+-+-+ | |
694 | * | addr_family | | |
695 | * +-+-+-+-+-+-+-+-+ | |
696 | * | addr... | | |
697 | * : : | |
698 | * | | | |
699 | * +-+-+-+-+-+-+-+-+ | |
700 | * | addr_len | len of addr. E.g., addr_len = 4 for ipv4 addrs. | |
701 | * +-+-+-+-+-+-+-+-+ | |
702 | * | daddr.. | | |
703 | * : : | |
704 | * | | | |
705 | * +-+-+-+-+-+-+-+-+ | |
706 | * | |
707 | */ | |
708 | ||
18a6dce6 | 709 | void |
710 | zebra_interface_if_set_value (struct stream *s, struct interface *ifp) | |
711 | { | |
712 | /* Read interface's index. */ | |
713 | ifp->ifindex = stream_getl (s); | |
508ec910 | 714 | ifp->status = stream_getc (s); |
18a6dce6 | 715 | |
716 | /* Read interface's value. */ | |
c77d4546 | 717 | ifp->flags = stream_getq (s); |
18a6dce6 | 718 | ifp->metric = stream_getl (s); |
719 | ifp->mtu = stream_getl (s); | |
508ec910 | 720 | ifp->mtu6 = stream_getl (s); |
18a6dce6 | 721 | ifp->bandwidth = stream_getl (s); |
722 | } | |
723 | ||
3fb9cd6e | 724 | static int |
725 | memconstant(const void *s, int c, size_t n) | |
726 | { | |
727 | const u_char *p = s; | |
728 | ||
729 | while (n-- > 0) | |
730 | if (*p++ != c) | |
731 | return 0; | |
732 | return 1; | |
733 | } | |
734 | ||
718e3744 | 735 | struct connected * |
0a589359 | 736 | zebra_interface_address_read (int type, struct stream *s) |
718e3744 | 737 | { |
738 | unsigned int ifindex; | |
739 | struct interface *ifp; | |
740 | struct connected *ifc; | |
0a589359 | 741 | struct prefix p, d; |
718e3744 | 742 | int family; |
743 | int plen; | |
0a589359 | 744 | u_char ifc_flags; |
718e3744 | 745 | |
0a589359 | 746 | memset (&p, 0, sizeof(p)); |
747 | memset (&d, 0, sizeof(d)); | |
718e3744 | 748 | |
749 | /* Get interface index. */ | |
750 | ifindex = stream_getl (s); | |
751 | ||
752 | /* Lookup index. */ | |
753 | ifp = if_lookup_by_index (ifindex); | |
754 | if (ifp == NULL) | |
755 | { | |
0a589359 | 756 | zlog_warn ("zebra_interface_address_read(%s): " |
757 | "Can't find interface by ifindex: %d ", | |
758 | (type == ZEBRA_INTERFACE_ADDRESS_ADD? "ADD" : "DELETE"), | |
759 | ifindex); | |
718e3744 | 760 | return NULL; |
761 | } | |
762 | ||
763 | /* Fetch flag. */ | |
0a589359 | 764 | ifc_flags = stream_getc (s); |
718e3744 | 765 | |
766 | /* Fetch interface address. */ | |
767 | family = p.family = stream_getc (s); | |
768 | ||
0a589359 | 769 | plen = prefix_blen (&p); |
770 | stream_get (&p.u.prefix, s, plen); | |
718e3744 | 771 | p.prefixlen = stream_getc (s); |
772 | ||
773 | /* Fetch destination address. */ | |
0a589359 | 774 | stream_get (&d.u.prefix, s, plen); |
718e3744 | 775 | d.family = family; |
776 | ||
0a589359 | 777 | if (type == ZEBRA_INTERFACE_ADDRESS_ADD) |
778 | { | |
3fb9cd6e | 779 | /* N.B. NULL destination pointers are encoded as all zeroes */ |
780 | ifc = connected_add_by_prefix(ifp, &p,(memconstant(&d.u.prefix,0,plen) ? | |
781 | NULL : &d)); | |
0a589359 | 782 | if (ifc != NULL) |
783 | ifc->flags = ifc_flags; | |
784 | } | |
785 | else | |
786 | { | |
787 | assert (type == ZEBRA_INTERFACE_ADDRESS_DELETE); | |
788 | ifc = connected_delete_by_prefix(ifp, &p); | |
789 | } | |
718e3744 | 790 | |
791 | return ifc; | |
792 | } | |
0a589359 | 793 | |
718e3744 | 794 | \f |
795 | /* Zebra client message read function. */ | |
634f9ea2 | 796 | static int |
718e3744 | 797 | zclient_read (struct thread *thread) |
798 | { | |
799 | int ret; | |
634f9ea2 | 800 | size_t already; |
c1b9800a | 801 | uint16_t length, command; |
802 | uint8_t marker, version; | |
718e3744 | 803 | struct zclient *zclient; |
804 | ||
805 | /* Get socket to zebra. */ | |
718e3744 | 806 | zclient = THREAD_ARG (thread); |
807 | zclient->t_read = NULL; | |
808 | ||
634f9ea2 | 809 | /* Read zebra header (if we don't have it already). */ |
810 | if ((already = stream_get_endp(zclient->ibuf)) < ZEBRA_HEADER_SIZE) | |
718e3744 | 811 | { |
634f9ea2 | 812 | ssize_t nbyte; |
813 | if (((nbyte = stream_read_try(zclient->ibuf, zclient->sock, | |
814 | ZEBRA_HEADER_SIZE-already)) == 0) || | |
815 | (nbyte == -1)) | |
816 | { | |
817 | if (zclient_debug) | |
818 | zlog_debug ("zclient connection closed socket [%d].", zclient->sock); | |
819 | return zclient_failed(zclient); | |
820 | } | |
821 | if (nbyte != (ssize_t)(ZEBRA_HEADER_SIZE-already)) | |
822 | { | |
823 | /* Try again later. */ | |
824 | zclient_event (ZCLIENT_READ, zclient); | |
825 | return 0; | |
826 | } | |
827 | already = ZEBRA_HEADER_SIZE; | |
718e3744 | 828 | } |
829 | ||
634f9ea2 | 830 | /* Reset to read from the beginning of the incoming packet. */ |
831 | stream_set_getp(zclient->ibuf, 0); | |
718e3744 | 832 | |
c1b9800a | 833 | /* Fetch header values. */ |
718e3744 | 834 | length = stream_getw (zclient->ibuf); |
c1b9800a | 835 | marker = stream_getc (zclient->ibuf); |
836 | version = stream_getc (zclient->ibuf); | |
837 | command = stream_getw (zclient->ibuf); | |
838 | ||
839 | if (marker != ZEBRA_HEADER_MARKER || version != ZSERV_VERSION) | |
840 | { | |
841 | zlog_err("%s: socket %d version mismatch, marker %d, version %d", | |
842 | __func__, zclient->sock, marker, version); | |
843 | return zclient_failed(zclient); | |
844 | } | |
845 | ||
634f9ea2 | 846 | if (length < ZEBRA_HEADER_SIZE) |
847 | { | |
848 | zlog_err("%s: socket %d message length %u is less than %d ", | |
849 | __func__, zclient->sock, length, ZEBRA_HEADER_SIZE); | |
850 | return zclient_failed(zclient); | |
851 | } | |
852 | ||
718e3744 | 853 | /* Length check. */ |
634f9ea2 | 854 | if (length > STREAM_SIZE(zclient->ibuf)) |
718e3744 | 855 | { |
634f9ea2 | 856 | struct stream *ns; |
857 | zlog_warn("%s: message size %u exceeds buffer size %lu, expanding...", | |
858 | __func__, length, (u_long)STREAM_SIZE(zclient->ibuf)); | |
859 | ns = stream_new(length); | |
860 | stream_copy(ns, zclient->ibuf); | |
718e3744 | 861 | stream_free (zclient->ibuf); |
634f9ea2 | 862 | zclient->ibuf = ns; |
718e3744 | 863 | } |
718e3744 | 864 | |
865 | /* Read rest of zebra packet. */ | |
634f9ea2 | 866 | if (already < length) |
867 | { | |
868 | ssize_t nbyte; | |
869 | if (((nbyte = stream_read_try(zclient->ibuf, zclient->sock, | |
870 | length-already)) == 0) || | |
871 | (nbyte == -1)) | |
872 | { | |
873 | if (zclient_debug) | |
874 | zlog_debug("zclient connection closed socket [%d].", zclient->sock); | |
875 | return zclient_failed(zclient); | |
876 | } | |
877 | if (nbyte != (ssize_t)(length-already)) | |
878 | { | |
879 | /* Try again later. */ | |
880 | zclient_event (ZCLIENT_READ, zclient); | |
881 | return 0; | |
882 | } | |
883 | } | |
884 | ||
885 | length -= ZEBRA_HEADER_SIZE; | |
718e3744 | 886 | |
0a589359 | 887 | if (zclient_debug) |
8ddca704 | 888 | zlog_debug("zclient 0x%p command 0x%x \n", zclient, command); |
0a589359 | 889 | |
718e3744 | 890 | switch (command) |
891 | { | |
18a6dce6 | 892 | case ZEBRA_ROUTER_ID_UPDATE: |
893 | if (zclient->router_id_update) | |
894 | ret = (*zclient->router_id_update) (command, zclient, length); | |
895 | break; | |
718e3744 | 896 | case ZEBRA_INTERFACE_ADD: |
897 | if (zclient->interface_add) | |
898 | ret = (*zclient->interface_add) (command, zclient, length); | |
899 | break; | |
900 | case ZEBRA_INTERFACE_DELETE: | |
901 | if (zclient->interface_delete) | |
902 | ret = (*zclient->interface_delete) (command, zclient, length); | |
903 | break; | |
904 | case ZEBRA_INTERFACE_ADDRESS_ADD: | |
905 | if (zclient->interface_address_add) | |
906 | ret = (*zclient->interface_address_add) (command, zclient, length); | |
907 | break; | |
908 | case ZEBRA_INTERFACE_ADDRESS_DELETE: | |
909 | if (zclient->interface_address_delete) | |
910 | ret = (*zclient->interface_address_delete) (command, zclient, length); | |
911 | break; | |
912 | case ZEBRA_INTERFACE_UP: | |
913 | if (zclient->interface_up) | |
914 | ret = (*zclient->interface_up) (command, zclient, length); | |
915 | break; | |
916 | case ZEBRA_INTERFACE_DOWN: | |
917 | if (zclient->interface_down) | |
918 | ret = (*zclient->interface_down) (command, zclient, length); | |
919 | break; | |
920 | case ZEBRA_IPV4_ROUTE_ADD: | |
921 | if (zclient->ipv4_route_add) | |
922 | ret = (*zclient->ipv4_route_add) (command, zclient, length); | |
923 | break; | |
924 | case ZEBRA_IPV4_ROUTE_DELETE: | |
925 | if (zclient->ipv4_route_delete) | |
926 | ret = (*zclient->ipv4_route_delete) (command, zclient, length); | |
927 | break; | |
928 | case ZEBRA_IPV6_ROUTE_ADD: | |
929 | if (zclient->ipv6_route_add) | |
930 | ret = (*zclient->ipv6_route_add) (command, zclient, length); | |
931 | break; | |
932 | case ZEBRA_IPV6_ROUTE_DELETE: | |
933 | if (zclient->ipv6_route_delete) | |
934 | ret = (*zclient->ipv6_route_delete) (command, zclient, length); | |
935 | break; | |
936 | default: | |
937 | break; | |
938 | } | |
939 | ||
634f9ea2 | 940 | if (zclient->sock < 0) |
941 | /* Connection was closed during packet processing. */ | |
942 | return -1; | |
943 | ||
718e3744 | 944 | /* Register read thread. */ |
634f9ea2 | 945 | stream_reset(zclient->ibuf); |
718e3744 | 946 | zclient_event (ZCLIENT_READ, zclient); |
947 | ||
948 | return 0; | |
949 | } | |
950 | ||
951 | void | |
0a589359 | 952 | zclient_redistribute (int command, struct zclient *zclient, int type) |
718e3744 | 953 | { |
718e3744 | 954 | |
0a589359 | 955 | if (command == ZEBRA_REDISTRIBUTE_ADD) |
956 | { | |
957 | if (zclient->redist[type]) | |
958 | return; | |
959 | zclient->redist[type] = 1; | |
960 | } | |
961 | else | |
962 | { | |
963 | if (!zclient->redist[type]) | |
964 | return; | |
965 | zclient->redist[type] = 0; | |
966 | } | |
718e3744 | 967 | |
968 | if (zclient->sock > 0) | |
634f9ea2 | 969 | zebra_redistribute_send (command, zclient, type); |
718e3744 | 970 | } |
971 | ||
718e3744 | 972 | |
973 | void | |
0a589359 | 974 | zclient_redistribute_default (int command, struct zclient *zclient) |
718e3744 | 975 | { |
718e3744 | 976 | |
0a589359 | 977 | if (command == ZEBRA_REDISTRIBUTE_DEFAULT_ADD) |
978 | { | |
979 | if (zclient->default_information) | |
980 | return; | |
981 | zclient->default_information = 1; | |
982 | } | |
983 | else | |
984 | { | |
985 | if (!zclient->default_information) | |
986 | return; | |
987 | zclient->default_information = 0; | |
988 | } | |
718e3744 | 989 | |
990 | if (zclient->sock > 0) | |
0a589359 | 991 | zebra_message_send (zclient, command); |
718e3744 | 992 | } |
993 | ||
718e3744 | 994 | static void |
995 | zclient_event (enum event event, struct zclient *zclient) | |
996 | { | |
997 | switch (event) | |
998 | { | |
999 | case ZCLIENT_SCHEDULE: | |
1000 | if (! zclient->t_connect) | |
1001 | zclient->t_connect = | |
1002 | thread_add_event (master, zclient_connect, zclient, 0); | |
1003 | break; | |
1004 | case ZCLIENT_CONNECT: | |
1005 | if (zclient->fail >= 10) | |
1006 | return; | |
1007 | if (zclient_debug) | |
8ddca704 | 1008 | zlog_debug ("zclient connect schedule interval is %d", |
718e3744 | 1009 | zclient->fail < 3 ? 10 : 60); |
1010 | if (! zclient->t_connect) | |
1011 | zclient->t_connect = | |
1012 | thread_add_timer (master, zclient_connect, zclient, | |
1013 | zclient->fail < 3 ? 10 : 60); | |
1014 | break; | |
1015 | case ZCLIENT_READ: | |
1016 | zclient->t_read = | |
1017 | thread_add_read (master, zclient_read, zclient, zclient->sock); | |
1018 | break; | |
1019 | } | |
1020 | } |