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718e3744 | 1 | /* ICMP Router Discovery Messages |
2 | * Copyright (C) 1997, 2000 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 | #include <netinet/ip_icmp.h> | |
25 | ||
26 | #include "if.h" | |
27 | #include "stream.h" | |
28 | #include "memory.h" | |
29 | #include "command.h" | |
30 | #include "log.h" | |
31 | #include "sockunion.h" | |
32 | #include "sockopt.h" | |
33 | ||
34 | #include "zebra/irdp.h" | |
35 | ||
36 | /* Default does nothing. */ | |
37 | int irdp_mode = IRDP_NONE; | |
38 | ||
39 | /* Timer interval of irdp. */ | |
40 | int irdp_timer_interval = IRDP_DEFAULT_INTERVAL; | |
41 | ||
42 | /* Max solicitations */ | |
43 | int max_solicitations = MAX_SOLICITATIONS; | |
44 | ||
45 | #define IRDP_SOLICIT_PACKET_SIZE 8 | |
46 | ||
47 | static struct irdp *irdp_head = NULL; | |
48 | ||
49 | extern int in_cksum (void *ptr, int nbytes); | |
50 | ||
51 | char *icmp_type_str[] = | |
52 | { | |
53 | "Echo Reply", | |
54 | "ICMP 1", | |
55 | "ICMP 2", | |
56 | "Dest Unreachable", | |
57 | "Source Quench", | |
58 | "Redirect", | |
59 | "ICMP 6", | |
60 | "ICMP 7", | |
61 | "Echo", | |
62 | "Router Advertise", | |
63 | "Router Solicitation", | |
64 | "Time Exceeded", | |
65 | "Parameter Problem", | |
66 | "Timestamp", | |
67 | "Timestamp Reply", | |
68 | "Info Request", | |
69 | "Info Reply", | |
70 | "Netmask Request", | |
71 | "Netmask Reply", | |
72 | }; | |
73 | ||
74 | char * | |
75 | icmp_type (int type) | |
76 | { | |
77 | if (type < 0 || type >= (sizeof icmp_type_str / sizeof (char *))) { | |
78 | return "OUT-OF-RANGE"; | |
79 | } | |
80 | return icmp_type_str [type]; | |
81 | } | |
82 | ||
83 | /* */ | |
84 | void | |
85 | irdp_add_interface () | |
86 | { | |
87 | ; | |
88 | } | |
89 | ||
90 | /* */ | |
91 | void | |
92 | irdp_delete_interface () | |
93 | { | |
94 | ||
95 | } | |
96 | ||
97 | struct irdp * | |
98 | irdp_route_new () | |
99 | { | |
100 | struct irdp *new = XMALLOC (0, sizeof (struct irdp)); | |
101 | memset (new, 0, sizeof (struct irdp)); | |
102 | return new; | |
103 | } | |
104 | ||
105 | void | |
106 | irdp_route_free (struct irdp *route) | |
107 | { | |
108 | XFREE (0, route); | |
109 | } | |
110 | ||
111 | void | |
112 | route_delete () | |
113 | { | |
114 | ||
115 | } | |
116 | ||
117 | void | |
118 | route_init () | |
119 | { | |
120 | ||
121 | } | |
122 | ||
123 | void | |
124 | route_add (struct in_addr addr, unsigned long pref) | |
125 | { | |
126 | struct irdp *new = irdp_route_new(); | |
127 | ||
128 | new->prefix = addr; | |
129 | new->pref = pref; | |
130 | ||
131 | printf ("address %s\n", inet_ntoa (new->prefix)); | |
132 | printf ("pref %ld\n", new->pref); | |
133 | } | |
134 | ||
135 | void | |
136 | route_age (int time) | |
137 | { | |
138 | struct irdp *p; | |
139 | ||
140 | for (p = irdp_head; p != NULL; p = p->next) { | |
141 | if (p->timer < time) { | |
142 | /* fire */ | |
143 | } else { | |
144 | p->timer -= time; | |
145 | } | |
146 | } | |
147 | } | |
148 | ||
149 | #define FLAG_TEST(a) ((ifp->flags & (a)) == (a)) | |
150 | ||
151 | void | |
152 | send_multicast (struct interface *ifp, int sock, struct stream *s, int size) | |
153 | { | |
154 | struct sockaddr_in sin; | |
155 | struct in_addr addr; | |
156 | int nbytes; | |
157 | struct connected *connected; | |
158 | listnode node; | |
159 | ||
160 | for (node = listhead (ifp->connected); node; nextnode (node)) | |
161 | { | |
162 | connected = getdata (node); | |
163 | } | |
164 | ||
165 | if (setsockopt_multicast_ipv4 (sock, IP_MULTICAST_IF, | |
166 | addr, 0, ifp->ifindex) < 0) | |
167 | { | |
168 | perror ("setsockopt"); | |
169 | exit (1); | |
170 | } | |
171 | ||
172 | sin.sin_addr.s_addr = htonl (INADDR_ALLRTRS_GROUP); | |
173 | sin.sin_family = AF_INET; | |
174 | ||
175 | nbytes = sendto (sock, s->data, size, 0, | |
176 | (struct sockaddr *) &sin, sizeof (struct sockaddr)); | |
177 | ||
178 | if (nbytes != size) | |
179 | { | |
180 | perror ("sendto"); | |
181 | exit (1); | |
182 | } | |
183 | } | |
184 | ||
185 | void | |
186 | send_broadcast () | |
187 | { | |
188 | struct sockaddr_in sin; | |
189 | ||
190 | printf ("broadcast\n"); | |
191 | inet_aton ("255.255.255.255", &sin.sin_addr); | |
192 | } | |
193 | ||
194 | void | |
195 | irdp_send_solicit (int sock, struct stream *s, int size) | |
196 | { | |
197 | struct interface *ifp; | |
198 | listnode node; | |
199 | ||
200 | for (node = listhead (iflist); node; nextnode (node)) | |
201 | { | |
202 | ifp = getdata (node); | |
203 | if (FLAG_TEST (IFF_UP | IFF_MULTICAST)) | |
204 | { | |
205 | send_multicast (ifp, sock, s, size); | |
206 | } | |
207 | else if (FLAG_TEST (IFF_UP | IFF_BROADCAST)) | |
208 | { | |
209 | send_broadcast (); | |
210 | } | |
211 | } | |
212 | } | |
213 | ||
214 | int | |
215 | ipv4_multicast_join (int sock, | |
216 | struct in_addr group, | |
217 | struct in_addr ifa, | |
218 | unsigned int ifindex) | |
219 | { | |
220 | int ret; | |
221 | ||
222 | ret = setsockopt_multicast_ipv4 (sock, IP_ADD_MEMBERSHIP, | |
223 | ifa, group.saddr, ifindex); | |
224 | ||
225 | if (ret < 0) | |
226 | zlog (NULL, LOG_INFO, "can't setsockopt IP_ADD_MEMBERSHIP"); | |
227 | ||
228 | return ret; | |
229 | } | |
230 | ||
231 | /* multicast packet recieve socket */ | |
232 | int | |
233 | irdp_multicast_socket (int sock, struct in_addr group) | |
234 | { | |
235 | struct interface *ifp; | |
236 | listnode node; | |
237 | struct in_addr addr; | |
238 | ||
239 | for (node = listhead (iflist); node; nextnode (node)) | |
240 | { | |
241 | ifp = getdata (node); | |
242 | ||
243 | if ((ifp->flags & IFF_UP) && (ifp->flags & IFF_MULTICAST)) | |
244 | { | |
245 | ipv4_multicast_join (sock, group, addr, ifp->ifindex); | |
246 | } | |
247 | } | |
248 | return 0; | |
249 | } | |
250 | ||
251 | struct | |
252 | { | |
253 | u_char type; | |
254 | u_char code; | |
255 | u_int16_t checksum; | |
256 | u_char number; | |
257 | u_char entry; | |
258 | u_int16_t lifetime; | |
259 | } radv; | |
260 | ||
261 | void | |
262 | irdp_set (int sock) | |
263 | { | |
264 | struct in_addr irdp_group; | |
265 | ||
266 | switch (irdp_mode) | |
267 | { | |
268 | case IRDP_HOST: | |
269 | irdp_group.s_addr = htonl (INADDR_ALLHOSTS_GROUP); | |
270 | break; | |
271 | case IRDP_ROUTER: | |
272 | irdp_group.s_addr = htonl (INADDR_ALLRTRS_GROUP); | |
273 | break; | |
274 | case IRDP_NONE: | |
275 | default: | |
276 | return; | |
277 | } | |
278 | irdp_multicast_socket (sock, irdp_group); | |
279 | } | |
280 | ||
281 | /* Make ICMP Router Solicitation Message. */ | |
282 | int | |
283 | make_solicit_packet (struct stream *s) | |
284 | { | |
285 | int size; | |
286 | int checksum; | |
287 | ||
288 | stream_putc (s, ICMP_ROUTERSOLICIT); /* Type. */ | |
289 | stream_putc (s, 0); /* Code. */ | |
290 | stream_putw (s, 0); /* Checksum. */ | |
291 | stream_putl (s, 0); /* Reserved. */ | |
292 | ||
293 | /* in_cksum return network byte order value */ | |
294 | size = IRDP_SOLICIT_PACKET_SIZE; | |
295 | checksum = in_cksum (s->data, size); | |
296 | stream_putw_at (s, checksum, 2); | |
297 | ||
298 | return IRDP_SOLICIT_PACKET_SIZE; | |
299 | } | |
300 | ||
301 | void | |
302 | irdp_solicit (int sock) | |
303 | { | |
304 | struct stream *s; | |
305 | ||
306 | s = stream_new (IRDP_SOLICIT_PACKET_SIZE); | |
307 | make_solicit_packet (s); | |
308 | irdp_send_solicit (sock, s, IRDP_SOLICIT_PACKET_SIZE); | |
309 | } | |
310 | ||
311 | #define ICMP_MINLEN 8 | |
312 | ||
313 | /* check validity of the packet */ | |
314 | int | |
315 | irdp_valid_check (char *packet, size_t size, struct sockaddr_in *from) | |
316 | { | |
317 | struct icmp *icmp; | |
318 | ||
319 | icmp = (struct icmp *) packet; | |
320 | ||
321 | if (in_cksum (packet, size)) { | |
322 | zlog_warn ("ICMP %s packet from %s: Bad checksum, silently ignored", | |
323 | icmp_type (icmp->icmp_type), | |
324 | inet_ntoa (from->sin_addr)); | |
325 | return -1; | |
326 | } | |
327 | ||
328 | if (icmp->icmp_code != 0) { | |
329 | zlog_warn ("ICMP %s packet from %s: Bad ICMP type code, silently ignored", | |
330 | icmp_type (icmp->icmp_type), | |
331 | inet_ntoa (from->sin_addr)); | |
332 | return -1; | |
333 | } | |
334 | ||
335 | if (size < ICMP_MINLEN) { | |
336 | zlog_warn ("ICMP %s packet from %s: IMCP message length is short", | |
337 | icmp_type (icmp->icmp_type), | |
338 | inet_ntoa (from->sin_addr)); | |
339 | return -1; | |
340 | } | |
341 | return 0; | |
342 | } | |
343 | ||
344 | int | |
345 | irdp_solicit_recv (struct stream *s, int size, struct sockaddr_in *from) | |
346 | { | |
347 | if (irdp_valid_check (s->data, size, from)) { | |
348 | return 1; | |
349 | } | |
350 | return 0; | |
351 | } | |
352 | ||
353 | void | |
354 | irdp_advert_recv (struct stream *s, int size, struct sockaddr_in *from) | |
355 | { | |
356 | int i; | |
357 | struct in_addr addr; | |
358 | long pref; | |
359 | ||
360 | if (irdp_valid_check (s->data, size, from) < 0) { | |
361 | return; | |
362 | } | |
363 | ||
364 | radv.type = stream_getc (s); | |
365 | radv.code = stream_getc (s); | |
366 | radv.checksum = stream_getw (s); | |
367 | radv.number = stream_getc (s); | |
368 | radv.entry = stream_getc (s); | |
369 | radv.lifetime = stream_getw (s); | |
370 | ||
371 | printf ("type : %s\n", icmp_type (radv.type)); | |
372 | printf ("number: %d\n", radv.number); | |
373 | printf ("entry: %d\n", radv.entry); | |
374 | printf ("lifetime: %d\n", radv.entry); | |
375 | ||
376 | for (i = 0; i < radv.number; i++) | |
377 | { | |
378 | addr.s_addr = stream_getl (s); | |
379 | pref = stream_getl (s); | |
380 | route_add (addr, ntohl (pref)); | |
381 | } | |
382 | /* Packet size check is needed at here. */ | |
383 | } | |
384 | ||
385 | void | |
386 | irdp_packet_process (char *buf, int size, struct sockaddr_in *from) | |
387 | { | |
388 | struct ip *ip; | |
389 | struct icmp *icmp; | |
390 | int hlen; | |
391 | struct stream *s = NULL; | |
392 | ||
393 | ip = (struct ip *)buf; | |
394 | hlen = ip->ip_hl << 2; | |
395 | ||
396 | if (size < hlen + ICMP_MINLEN) | |
397 | zlog_err ("ICMP relpy length is short\n"); | |
398 | ||
399 | icmp = (struct icmp *)(buf + hlen); | |
400 | ||
401 | stream_forward (s, hlen); | |
402 | ||
403 | switch (icmp->icmp_type) | |
404 | { | |
405 | case ICMP_ROUTERADVERT: | |
406 | irdp_advert_recv (s, size - hlen, from); | |
407 | break; | |
408 | case ICMP_ROUTERSOLICIT: | |
409 | irdp_solicit_recv (s, size - hlen, from); | |
410 | break; | |
411 | } | |
412 | } | |
413 | ||
414 | /* Make socket for ICMP Router Discovery. */ | |
415 | int | |
416 | irdp_make_socket () | |
417 | { | |
418 | int sock; | |
419 | struct protoent *pent; | |
420 | ||
421 | if ((pent = getprotobyname ("icmp")) == NULL) { | |
422 | perror ("getprotobyname"); | |
423 | exit (1); | |
424 | } | |
425 | ||
426 | if ((sock = socket (AF_INET, SOCK_RAW, pent->p_proto)) < 0) | |
427 | { | |
428 | perror ("socket"); | |
429 | exit (1); | |
430 | } | |
431 | ||
432 | return sock; | |
433 | } | |
434 | ||
435 | /* recv routine */ | |
436 | int | |
437 | irdp_recv (int sock) | |
438 | { | |
439 | #define PACKET_BUF 4096 | |
440 | int nbytes; | |
441 | struct sockaddr_in from; | |
442 | int fromlen; | |
443 | char buf[PACKET_BUF]; | |
444 | ||
445 | fromlen = sizeof (from); | |
446 | nbytes = recvfrom (sock, (char *)buf, PACKET_BUF, 0, | |
447 | (struct sockaddr *)&from, &fromlen); | |
448 | ||
449 | if (nbytes < 0) | |
450 | { | |
451 | perror ("recvfrom"); | |
452 | exit (1); | |
453 | } | |
454 | ||
455 | irdp_packet_process (buf, nbytes, &from); | |
456 | ||
457 | return 0; | |
458 | } | |
459 | ||
460 | /* irdp packet recv loop */ | |
461 | void | |
462 | irdp_loop (int sock) | |
463 | { | |
464 | while (1) | |
465 | { | |
466 | irdp_recv (sock); | |
467 | } | |
468 | } | |
469 | \f | |
470 | DEFUN (ip_irdp, | |
471 | ip_irdp_cmd, | |
472 | "ip irdp", | |
473 | IP_STR | |
474 | "ICMP Router discovery on this interface\n") | |
475 | { | |
476 | return CMD_SUCCESS; | |
477 | } | |
478 | ||
479 | DEFUN (ip_irdp_multicast, | |
480 | ip_irdp_multicast_cmd, | |
481 | "ip irdp multicast", | |
482 | IP_STR | |
483 | "ICMP Router discovery on this interface\n" | |
484 | "Send IRDP advertisement to the multicast address\n") | |
485 | { | |
486 | return CMD_SUCCESS; | |
487 | } | |
488 | ||
489 | DEFUN (ip_irdp_holdtime, | |
490 | ip_irdp_holdtime_cmd, | |
491 | "ip irdp holdtime <0-9000>", | |
492 | IP_STR | |
493 | "ICMP Router discovery on this interface\n" | |
494 | "Set holdtime value\n" | |
495 | "Holdtime value in seconds. Default is 1800 seconds\n") | |
496 | { | |
497 | return CMD_SUCCESS; | |
498 | } | |
499 | ||
500 | DEFUN (ip_irdp_maxadvertinterval, | |
501 | ip_irdp_maxadvertinterval_cmd, | |
502 | "ip irdp maxadvertinterval (0|<4-1800>)", | |
503 | IP_STR | |
504 | "ICMP Router discovery on this interface\n" | |
505 | "Set maximum time between advertisement\n" | |
506 | "Maximum advertisement interval in seconds\n") | |
507 | { | |
508 | return CMD_SUCCESS; | |
509 | } | |
510 | ||
511 | DEFUN (ip_irdp_minadvertinterval, | |
512 | ip_irdp_minadvertinterval_cmd, | |
513 | "ip irdp minadvertinterval <3-1800>", | |
514 | IP_STR | |
515 | "ICMP Router discovery on this interface\n" | |
516 | "Set minimum time between advertisement\n" | |
517 | "Minimum advertisement interval in seconds\n") | |
518 | { | |
519 | return CMD_SUCCESS; | |
520 | } | |
521 | ||
522 | DEFUN (ip_irdp_preference, | |
523 | ip_irdp_preference_cmd, | |
524 | /* "ip irdp preference <-2147483648-2147483647>", */ | |
525 | "ip irdp preference <0-2147483647>", | |
526 | IP_STR | |
527 | "ICMP Router discovery on this interface\n" | |
528 | "Set default preference level for this interface\n" | |
529 | "Preference level\n") | |
530 | { | |
531 | return CMD_SUCCESS; | |
532 | } | |
533 | ||
534 | #if 0 | |
535 | DEFUN (ip_irdp_address, | |
536 | ip_irdp_address_cmd, | |
537 | "ip irdp address A.B.C.D", | |
538 | IP_STR | |
539 | "ICMP Router discovery on this interface\n" | |
540 | "Specify IRDP address and preference to proxy-advertise\n" | |
541 | "Set IRDP address for proxy-advertise\n") | |
542 | { | |
543 | return CMD_SUCCESS; | |
544 | } | |
545 | #endif /* 0 */ | |
546 | ||
547 | DEFUN (ip_irdp_address_preference, | |
548 | ip_irdp_address_preference_cmd, | |
549 | "ip irdp address A.B.C.D <0-2147483647>", | |
550 | IP_STR | |
551 | "ICMP Router discovery on this interface\n" | |
552 | "Specify IRDP address and preference to proxy-advertise\n" | |
553 | "Set IRDP address for proxy-advertise\n" | |
554 | "Preference level\n") | |
555 | { | |
556 | return CMD_SUCCESS; | |
557 | } | |
558 | \f | |
559 | void | |
560 | irdp_init () | |
561 | { | |
562 | install_element (INTERFACE_NODE, &ip_irdp_cmd); | |
563 | install_element (INTERFACE_NODE, &ip_irdp_multicast_cmd); | |
564 | install_element (INTERFACE_NODE, &ip_irdp_holdtime_cmd); | |
565 | install_element (INTERFACE_NODE, &ip_irdp_maxadvertinterval_cmd); | |
566 | install_element (INTERFACE_NODE, &ip_irdp_minadvertinterval_cmd); | |
567 | install_element (INTERFACE_NODE, &ip_irdp_preference_cmd); | |
568 | install_element (INTERFACE_NODE, &ip_irdp_address_preference_cmd); | |
569 | } |