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1 | /* | |
2 | * EIGRP Sending and Receiving EIGRP Hello Packets. | |
3 | * Copyright (C) 2013-2016 | |
4 | * Authors: | |
5 | * Donnie Savage | |
6 | * Jan Janovic | |
7 | * Matej Perina | |
8 | * Peter Orsag | |
9 | * Peter Paluch | |
10 | * Frantisek Gazo | |
11 | * Tomas Hvorkovy | |
12 | * Martin Kontsek | |
13 | * Lukas Koribsky | |
14 | * | |
15 | * This file is part of GNU Zebra. | |
16 | * | |
17 | * GNU Zebra is free software; you can redistribute it and/or modify it | |
18 | * under the terms of the GNU General Public License as published by the | |
19 | * Free Software Foundation; either version 2, or (at your option) any | |
20 | * later version. | |
21 | * | |
22 | * GNU Zebra is distributed in the hope that it will be useful, but | |
23 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
24 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
25 | * General Public License for more details. | |
26 | * | |
27 | * You should have received a copy of the GNU General Public License along | |
28 | * with this program; see the file COPYING; if not, write to the Free Software | |
29 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
30 | */ | |
31 | ||
32 | #include <zebra.h> | |
33 | ||
34 | #include "thread.h" | |
35 | #include "memory.h" | |
36 | #include "linklist.h" | |
37 | #include "prefix.h" | |
38 | #include "if.h" | |
39 | #include "table.h" | |
40 | #include "sockunion.h" | |
41 | #include "stream.h" | |
42 | #include "log.h" | |
43 | #include "sockopt.h" | |
44 | #include "checksum.h" | |
45 | #include "vty.h" | |
46 | #include "md5.h" | |
47 | ||
48 | #include "eigrpd/eigrp_structs.h" | |
49 | #include "eigrpd/eigrpd.h" | |
50 | #include "eigrpd/eigrp_interface.h" | |
51 | #include "eigrpd/eigrp_neighbor.h" | |
52 | #include "eigrpd/eigrp_packet.h" | |
53 | #include "eigrpd/eigrp_zebra.h" | |
54 | #include "eigrpd/eigrp_vty.h" | |
55 | #include "eigrpd/eigrp_dump.h" | |
56 | #include "eigrpd/eigrp_macros.h" | |
57 | #include "eigrpd/eigrp_errors.h" | |
58 | ||
59 | /* Packet Type String. */ | |
60 | static const struct message eigrp_general_tlv_type_str[] = { | |
61 | {EIGRP_TLV_PARAMETER, "PARAMETER"}, | |
62 | {EIGRP_TLV_AUTH, "AUTH"}, | |
63 | {EIGRP_TLV_SEQ, "SEQ"}, | |
64 | {EIGRP_TLV_SW_VERSION, "SW_VERSION"}, | |
65 | {EIGRP_TLV_NEXT_MCAST_SEQ, "NEXT_MCAST_SEQ"}, | |
66 | {EIGRP_TLV_PEER_TERMINATION, "PEER_TERMINATION"}, | |
67 | {EIGRP_TLV_PEER_MTRLIST, "PEER_MTRLIST"}, | |
68 | {EIGRP_TLV_PEER_TIDLIST, "PEER_TIDLIST"}, | |
69 | {0}}; | |
70 | ||
71 | ||
72 | /* | |
73 | * @fn eigrp_hello_timer | |
74 | * | |
75 | * @param[in] thread current execution thread timer is associated with | |
76 | * | |
77 | * @return int always returns 0 | |
78 | * | |
79 | * @par | |
80 | * Called once per "hello" time interval, default 5 seconds | |
81 | * Sends hello packet via multicast for all interfaces eigrp | |
82 | * is configured for | |
83 | */ | |
84 | int eigrp_hello_timer(struct thread *thread) | |
85 | { | |
86 | struct eigrp_interface *ei; | |
87 | ||
88 | ei = THREAD_ARG(thread); | |
89 | ei->t_hello = NULL; | |
90 | ||
91 | if (IS_DEBUG_EIGRP(0, TIMERS)) | |
92 | zlog_debug("Start Hello Timer (%s) Expire [%u]", IF_NAME(ei), | |
93 | ei->params.v_hello); | |
94 | ||
95 | /* Sending hello packet. */ | |
96 | eigrp_hello_send(ei, EIGRP_HELLO_NORMAL, NULL); | |
97 | ||
98 | /* Hello timer set. */ | |
99 | ei->t_hello = NULL; | |
100 | thread_add_timer(master, eigrp_hello_timer, ei, ei->params.v_hello, | |
101 | &ei->t_hello); | |
102 | ||
103 | return 0; | |
104 | } | |
105 | ||
106 | /** | |
107 | * @fn eigrp_hello_parameter_decode | |
108 | * | |
109 | * @param[in] nbr neighbor the ACK should be sent to | |
110 | * @param[in] param pointer packet TLV is stored to | |
111 | * | |
112 | * @return uint16_t number of bytes added to packet stream | |
113 | * | |
114 | * @par | |
115 | * Encode Parameter TLV, used to convey metric weights and the hold time. | |
116 | * | |
117 | * @usage | |
118 | * Note the addition of K6 for the new extended metrics, and does not apply to | |
119 | * older TLV packet formats. | |
120 | */ | |
121 | static struct eigrp_neighbor * | |
122 | eigrp_hello_parameter_decode(struct eigrp_neighbor *nbr, | |
123 | struct eigrp_tlv_hdr_type *tlv) | |
124 | { | |
125 | struct eigrp *eigrp = nbr->ei->eigrp; | |
126 | struct TLV_Parameter_Type *param = (struct TLV_Parameter_Type *)tlv; | |
127 | ||
128 | /* copy over the values passed in by the neighbor */ | |
129 | nbr->K1 = param->K1; | |
130 | nbr->K2 = param->K2; | |
131 | nbr->K3 = param->K3; | |
132 | nbr->K4 = param->K4; | |
133 | nbr->K5 = param->K5; | |
134 | nbr->K6 = param->K6; | |
135 | nbr->v_holddown = ntohs(param->hold_time); | |
136 | ||
137 | /* | |
138 | * Check K1-K5 have the correct values to be able to become neighbors | |
139 | * K6 does not have to match | |
140 | */ | |
141 | if ((eigrp->k_values[0] == nbr->K1) && (eigrp->k_values[1] == nbr->K2) | |
142 | && (eigrp->k_values[2] == nbr->K3) | |
143 | && (eigrp->k_values[3] == nbr->K4) | |
144 | && (eigrp->k_values[4] == nbr->K5)) { | |
145 | ||
146 | if (eigrp_nbr_state_get(nbr) == EIGRP_NEIGHBOR_DOWN) { | |
147 | zlog_info("Neighbor %s (%s) is pending: new adjacency", | |
148 | inet_ntoa(nbr->src), | |
149 | ifindex2ifname(nbr->ei->ifp->ifindex, | |
150 | VRF_DEFAULT)); | |
151 | ||
152 | /* Expedited hello sent */ | |
153 | eigrp_hello_send(nbr->ei, EIGRP_HELLO_NORMAL, NULL); | |
154 | ||
155 | // if(ntohl(nbr->ei->address->u.prefix4.s_addr) > | |
156 | // ntohl(nbr->src.s_addr)) | |
157 | eigrp_update_send_init(nbr); | |
158 | ||
159 | eigrp_nbr_state_set(nbr, EIGRP_NEIGHBOR_PENDING); | |
160 | } | |
161 | } else { | |
162 | if (eigrp_nbr_state_get(nbr) != EIGRP_NEIGHBOR_DOWN) { | |
163 | if ((param->K1 & param->K2 & param->K3 & param->K4 | |
164 | & param->K5) | |
165 | == 255) { | |
166 | zlog_info( | |
167 | "Neighbor %s (%s) is down: Interface PEER-TERMINATION received", | |
168 | inet_ntoa(nbr->src), | |
169 | ifindex2ifname(nbr->ei->ifp->ifindex, | |
170 | VRF_DEFAULT)); | |
171 | eigrp_nbr_delete(nbr); | |
172 | return NULL; | |
173 | } else { | |
174 | zlog_info( | |
175 | "Neighbor %s (%s) going down: Kvalue mismatch", | |
176 | inet_ntoa(nbr->src), | |
177 | ifindex2ifname(nbr->ei->ifp->ifindex, | |
178 | VRF_DEFAULT)); | |
179 | eigrp_nbr_state_set(nbr, EIGRP_NEIGHBOR_DOWN); | |
180 | } | |
181 | } | |
182 | } | |
183 | ||
184 | return nbr; | |
185 | } | |
186 | ||
187 | static uint8_t | |
188 | eigrp_hello_authentication_decode(struct stream *s, | |
189 | struct eigrp_tlv_hdr_type *tlv_header, | |
190 | struct eigrp_neighbor *nbr) | |
191 | { | |
192 | struct TLV_MD5_Authentication_Type *md5; | |
193 | ||
194 | md5 = (struct TLV_MD5_Authentication_Type *)tlv_header; | |
195 | ||
196 | if (md5->auth_type == EIGRP_AUTH_TYPE_MD5) | |
197 | return eigrp_check_md5_digest(s, md5, nbr, | |
198 | EIGRP_AUTH_BASIC_HELLO_FLAG); | |
199 | else if (md5->auth_type == EIGRP_AUTH_TYPE_SHA256) | |
200 | return eigrp_check_sha256_digest( | |
201 | s, (struct TLV_SHA256_Authentication_Type *)tlv_header, | |
202 | nbr, EIGRP_AUTH_BASIC_HELLO_FLAG); | |
203 | ||
204 | return 0; | |
205 | } | |
206 | ||
207 | /** | |
208 | * @fn eigrp_sw_version_decode | |
209 | * | |
210 | * @param[in] nbr neighbor the ACK shoudl be sent to | |
211 | * @param[in] param pointer to TLV software version information | |
212 | * | |
213 | * @return void | |
214 | * | |
215 | * @par | |
216 | * Read the software version in the specified location. | |
217 | * This consists of two bytes of OS version, and two bytes of EIGRP | |
218 | * revision number. | |
219 | */ | |
220 | static void eigrp_sw_version_decode(struct eigrp_neighbor *nbr, | |
221 | struct eigrp_tlv_hdr_type *tlv) | |
222 | { | |
223 | struct TLV_Software_Type *version = (struct TLV_Software_Type *)tlv; | |
224 | ||
225 | nbr->os_rel_major = version->vender_major; | |
226 | nbr->os_rel_minor = version->vender_minor; | |
227 | nbr->tlv_rel_major = version->eigrp_major; | |
228 | nbr->tlv_rel_minor = version->eigrp_minor; | |
229 | return; | |
230 | } | |
231 | ||
232 | /** | |
233 | * @fn eigrp_peer_termination_decode | |
234 | * | |
235 | * @param[in] nbr neighbor the ACK shoudl be sent to | |
236 | * @param[in] tlv pointer to TLV software version information | |
237 | * | |
238 | * @return void | |
239 | * | |
240 | * @par | |
241 | * Read the address in the TLV and match to out address. If | |
242 | * a match is found, move the sending neighbor to the down state. If | |
243 | * out address is not in the TLV, then ignore the peer termination | |
244 | */ | |
245 | static void eigrp_peer_termination_decode(struct eigrp_neighbor *nbr, | |
246 | struct eigrp_tlv_hdr_type *tlv) | |
247 | { | |
248 | struct TLV_Peer_Termination_type *param = | |
249 | (struct TLV_Peer_Termination_type *)tlv; | |
250 | ||
251 | uint32_t my_ip = nbr->ei->address.u.prefix4.s_addr; | |
252 | uint32_t received_ip = param->neighbor_ip; | |
253 | ||
254 | if (my_ip == received_ip) { | |
255 | zlog_info("Neighbor %s (%s) is down: Peer Termination received", | |
256 | inet_ntoa(nbr->src), | |
257 | ifindex2ifname(nbr->ei->ifp->ifindex, VRF_DEFAULT)); | |
258 | /* set neighbor to DOWN */ | |
259 | nbr->state = EIGRP_NEIGHBOR_DOWN; | |
260 | /* delete neighbor */ | |
261 | eigrp_nbr_delete(nbr); | |
262 | } | |
263 | } | |
264 | ||
265 | /** | |
266 | * @fn eigrp_peer_termination_encode | |
267 | * | |
268 | * @param[in,out] s packet stream TLV is stored to | |
269 | * @param[in] nbr_addr pointer to neighbor address for Peer | |
270 | * Termination TLV | |
271 | * | |
272 | * @return uint16_t number of bytes added to packet stream | |
273 | * | |
274 | * @par | |
275 | * Function used to encode Peer Termination TLV to Hello packet. | |
276 | */ | |
277 | static uint16_t eigrp_peer_termination_encode(struct stream *s, | |
278 | struct in_addr *nbr_addr) | |
279 | { | |
280 | uint16_t length = EIGRP_TLV_PEER_TERMINATION_LEN; | |
281 | ||
282 | /* fill in type and length */ | |
283 | stream_putw(s, EIGRP_TLV_PEER_TERMINATION); | |
284 | stream_putw(s, length); | |
285 | ||
286 | /* fill in unknown field 0x04 */ | |
287 | stream_putc(s, 0x04); | |
288 | ||
289 | /* finally neighbor IP address */ | |
290 | stream_put_ipv4(s, nbr_addr->s_addr); | |
291 | ||
292 | return (length); | |
293 | } | |
294 | ||
295 | /* | |
296 | * @fn eigrp_hello_receive | |
297 | * | |
298 | * @param[in] eigrp eigrp routing process | |
299 | * @param[in] iph pointer to ip header | |
300 | * @param[in] eigrph pointer to eigrp header | |
301 | * @param[in] s input ip stream | |
302 | * @param[in] ei eigrp interface packet arrived on | |
303 | * @param[in] size size of eigrp packet | |
304 | * | |
305 | * @return void | |
306 | * | |
307 | * @par | |
308 | * This is the main worker function for processing hello packets. It | |
309 | * will validate the peer associated with the src ip address of the ip | |
310 | * header, and then decode each of the general TLVs which the packet | |
311 | * may contain. | |
312 | * | |
313 | * @usage | |
314 | * Not all TLVs are current decoder. This is a work in progress.. | |
315 | */ | |
316 | void eigrp_hello_receive(struct eigrp *eigrp, struct ip *iph, | |
317 | struct eigrp_header *eigrph, struct stream *s, | |
318 | struct eigrp_interface *ei, int size) | |
319 | { | |
320 | struct eigrp_tlv_hdr_type *tlv_header; | |
321 | struct eigrp_neighbor *nbr; | |
322 | uint16_t type; | |
323 | uint16_t length; | |
324 | ||
325 | /* get neighbor struct */ | |
326 | nbr = eigrp_nbr_get(ei, eigrph, iph); | |
327 | ||
328 | /* neighbor must be valid, eigrp_nbr_get creates if none existed */ | |
329 | assert(nbr); | |
330 | ||
331 | if (IS_DEBUG_EIGRP_PACKET(eigrph->opcode - 1, RECV)) | |
332 | zlog_debug("Processing Hello size[%u] int(%s) nbr(%s)", size, | |
333 | ifindex2ifname(nbr->ei->ifp->ifindex, VRF_DEFAULT), | |
334 | inet_ntoa(nbr->src)); | |
335 | ||
336 | size -= EIGRP_HEADER_LEN; | |
337 | if (size < 0) | |
338 | return; | |
339 | ||
340 | tlv_header = (struct eigrp_tlv_hdr_type *)eigrph->tlv; | |
341 | ||
342 | do { | |
343 | type = ntohs(tlv_header->type); | |
344 | length = ntohs(tlv_header->length); | |
345 | ||
346 | if ((length > 0) && (length <= size)) { | |
347 | if (IS_DEBUG_EIGRP_PACKET(0, RECV)) | |
348 | zlog_debug( | |
349 | " General TLV(%s)", | |
350 | lookup_msg(eigrp_general_tlv_type_str, | |
351 | type, NULL)); | |
352 | ||
353 | // determine what General TLV is being processed | |
354 | switch (type) { | |
355 | case EIGRP_TLV_PARAMETER: | |
356 | nbr = eigrp_hello_parameter_decode(nbr, | |
357 | tlv_header); | |
358 | if (!nbr) | |
359 | return; | |
360 | break; | |
361 | case EIGRP_TLV_AUTH: { | |
362 | if (eigrp_hello_authentication_decode( | |
363 | s, tlv_header, nbr) | |
364 | == 0) | |
365 | return; | |
366 | else | |
367 | break; | |
368 | break; | |
369 | } | |
370 | case EIGRP_TLV_SEQ: | |
371 | break; | |
372 | case EIGRP_TLV_SW_VERSION: | |
373 | eigrp_sw_version_decode(nbr, tlv_header); | |
374 | break; | |
375 | case EIGRP_TLV_NEXT_MCAST_SEQ: | |
376 | break; | |
377 | case EIGRP_TLV_PEER_TERMINATION: | |
378 | eigrp_peer_termination_decode(nbr, tlv_header); | |
379 | return; | |
380 | break; | |
381 | case EIGRP_TLV_PEER_MTRLIST: | |
382 | case EIGRP_TLV_PEER_TIDLIST: | |
383 | break; | |
384 | default: | |
385 | break; | |
386 | } | |
387 | } | |
388 | ||
389 | tlv_header = (struct eigrp_tlv_hdr_type *)(((char *)tlv_header) | |
390 | + length); | |
391 | size -= length; | |
392 | ||
393 | } while (size > 0); | |
394 | ||
395 | ||
396 | /*If received packet is hello with Parameter TLV*/ | |
397 | if (ntohl(eigrph->ack) == 0) { | |
398 | /* increment statistics. */ | |
399 | ei->hello_in++; | |
400 | if (nbr) | |
401 | eigrp_nbr_state_update(nbr); | |
402 | } | |
403 | ||
404 | if (IS_DEBUG_EIGRP_PACKET(0, RECV)) | |
405 | zlog_debug("Hello Packet received from %s", | |
406 | inet_ntoa(nbr->src)); | |
407 | } | |
408 | ||
409 | uint32_t FRR_MAJOR; | |
410 | uint32_t FRR_MINOR; | |
411 | ||
412 | void eigrp_sw_version_initialize(void) | |
413 | { | |
414 | char ver_string[] = VERSION; | |
415 | char *dash = strstr(ver_string, "-"); | |
416 | int ret; | |
417 | ||
418 | if (dash) | |
419 | dash[0] = '\0'; | |
420 | ||
421 | ret = sscanf(ver_string, "%" SCNu32 ".%" SCNu32, &FRR_MAJOR, | |
422 | &FRR_MINOR); | |
423 | if (ret != 2) | |
424 | flog_err(EC_EIGRP_PACKET, | |
425 | "Did not Properly parse %s, please fix VERSION string", | |
426 | VERSION); | |
427 | } | |
428 | ||
429 | /** | |
430 | * @fn eigrp_sw_version_encode | |
431 | * | |
432 | * @param[in,out] s packet stream TLV is stored to | |
433 | * | |
434 | * @return uint16_t number of bytes added to packet stream | |
435 | * | |
436 | * @par | |
437 | * Store the software version in the specified location. | |
438 | * This consists of two bytes of OS version, and two bytes of EIGRP | |
439 | * revision number. | |
440 | */ | |
441 | static uint16_t eigrp_sw_version_encode(struct stream *s) | |
442 | { | |
443 | uint16_t length = EIGRP_TLV_SW_VERSION_LEN; | |
444 | ||
445 | // setup the tlv fields | |
446 | stream_putw(s, EIGRP_TLV_SW_VERSION); | |
447 | stream_putw(s, length); | |
448 | ||
449 | stream_putc(s, FRR_MAJOR); //!< major os version | |
450 | stream_putc(s, FRR_MINOR); //!< minor os version | |
451 | ||
452 | /* and the core eigrp version */ | |
453 | stream_putc(s, EIGRP_MAJOR_VERSION); | |
454 | stream_putc(s, EIGRP_MINOR_VERSION); | |
455 | ||
456 | return (length); | |
457 | } | |
458 | ||
459 | /** | |
460 | * @fn eigrp_tidlist_encode | |
461 | * | |
462 | * @param[in,out] s packet stream TLV is stored to | |
463 | * | |
464 | * @return void | |
465 | * | |
466 | * @par | |
467 | * If doing mutli-topology, then store the supported TID list. | |
468 | * This is currently a place holder function | |
469 | */ | |
470 | static uint16_t eigrp_tidlist_encode(struct stream *s) | |
471 | { | |
472 | // uint16_t length = EIGRP_TLV_SW_VERSION_LEN; | |
473 | return 0; | |
474 | } | |
475 | ||
476 | /** | |
477 | * @fn eigrp_sequence_encode | |
478 | * | |
479 | * @param[in,out] s packet stream TLV is stored to | |
480 | * | |
481 | * @return uint16_t number of bytes added to packet stream | |
482 | * | |
483 | * @par | |
484 | * Part of conditional receive process | |
485 | * | |
486 | */ | |
487 | static uint16_t eigrp_sequence_encode(struct stream *s) | |
488 | { | |
489 | uint16_t length = EIGRP_TLV_SEQ_BASE_LEN; | |
490 | struct eigrp *eigrp; | |
491 | struct eigrp_interface *ei; | |
492 | struct listnode *node, *node2, *nnode2; | |
493 | struct eigrp_neighbor *nbr; | |
494 | size_t backup_end, size_end; | |
495 | int found; | |
496 | ||
497 | eigrp = eigrp_lookup(); | |
498 | if (eigrp == NULL) { | |
499 | return 0; | |
500 | } | |
501 | ||
502 | // add in the parameters TLV | |
503 | backup_end = stream_get_endp(s); | |
504 | stream_putw(s, EIGRP_TLV_SEQ); | |
505 | size_end = s->endp; | |
506 | stream_putw(s, 0x0000); | |
507 | stream_putc(s, IPV4_MAX_BYTELEN); | |
508 | ||
509 | found = 0; | |
510 | for (ALL_LIST_ELEMENTS_RO(eigrp->eiflist, node, ei)) { | |
511 | for (ALL_LIST_ELEMENTS(ei->nbrs, node2, nnode2, nbr)) { | |
512 | if (nbr->multicast_queue->count > 0) { | |
513 | length += (uint16_t)stream_put_ipv4( | |
514 | s, nbr->src.s_addr); | |
515 | found = 1; | |
516 | } | |
517 | } | |
518 | } | |
519 | ||
520 | if (found == 0) { | |
521 | stream_set_endp(s, backup_end); | |
522 | return 0; | |
523 | } | |
524 | ||
525 | backup_end = stream_get_endp(s); | |
526 | stream_set_endp(s, size_end); | |
527 | stream_putw(s, length); | |
528 | stream_set_endp(s, backup_end); | |
529 | ||
530 | return length; | |
531 | } | |
532 | ||
533 | /** | |
534 | * @fn eigrp_sequence_encode | |
535 | * | |
536 | * @param[in,out] s packet stream TLV is stored to | |
537 | * | |
538 | * @return uint16_t number of bytes added to packet stream | |
539 | * | |
540 | * @par | |
541 | * Part of conditional receive process | |
542 | * | |
543 | */ | |
544 | static uint16_t eigrp_next_sequence_encode(struct stream *s) | |
545 | { | |
546 | uint16_t length = EIGRP_NEXT_SEQUENCE_TLV_SIZE; | |
547 | struct eigrp *eigrp; | |
548 | ||
549 | eigrp = eigrp_lookup(); | |
550 | if (eigrp == NULL) { | |
551 | return 0; | |
552 | } | |
553 | ||
554 | // add in the parameters TLV | |
555 | stream_putw(s, EIGRP_TLV_NEXT_MCAST_SEQ); | |
556 | stream_putw(s, EIGRP_NEXT_SEQUENCE_TLV_SIZE); | |
557 | stream_putl(s, eigrp->sequence_number + 1); | |
558 | ||
559 | return length; | |
560 | } | |
561 | ||
562 | /** | |
563 | * @fn eigrp_hello_parameter_encode | |
564 | * | |
565 | * @param[in] ei pointer to interface hello packet came in on | |
566 | * @param[in,out] s packet stream TLV is stored to | |
567 | * | |
568 | * @return uint16_t number of bytes added to packet stream | |
569 | * | |
570 | * @par | |
571 | * Encode Parameter TLV, used to convey metric weights and the hold time. | |
572 | * | |
573 | * @usage | |
574 | * Note the addition of K6 for the new extended metrics, and does not apply to | |
575 | * older TLV packet formats. | |
576 | */ | |
577 | static uint16_t eigrp_hello_parameter_encode(struct eigrp_interface *ei, | |
578 | struct stream *s, uint8_t flags) | |
579 | { | |
580 | // add in the parameters TLV | |
581 | stream_putw(s, EIGRP_TLV_PARAMETER); | |
582 | stream_putw(s, EIGRP_TLV_PARAMETER_LEN); | |
583 | ||
584 | // if graceful shutdown is needed to be announced, send all 255 in K | |
585 | // values | |
586 | if (flags & EIGRP_HELLO_GRACEFUL_SHUTDOWN) { | |
587 | stream_putc(s, 0xff); /* K1 */ | |
588 | stream_putc(s, 0xff); /* K2 */ | |
589 | stream_putc(s, 0xff); /* K3 */ | |
590 | stream_putc(s, 0xff); /* K4 */ | |
591 | stream_putc(s, 0xff); /* K5 */ | |
592 | stream_putc(s, 0xff); /* K6 */ | |
593 | } else // set k values | |
594 | { | |
595 | stream_putc(s, ei->eigrp->k_values[0]); /* K1 */ | |
596 | stream_putc(s, ei->eigrp->k_values[1]); /* K2 */ | |
597 | stream_putc(s, ei->eigrp->k_values[2]); /* K3 */ | |
598 | stream_putc(s, ei->eigrp->k_values[3]); /* K4 */ | |
599 | stream_putc(s, ei->eigrp->k_values[4]); /* K5 */ | |
600 | stream_putc(s, ei->eigrp->k_values[5]); /* K6 */ | |
601 | } | |
602 | ||
603 | // and set hold time value.. | |
604 | stream_putw(s, ei->params.v_wait); | |
605 | ||
606 | return EIGRP_TLV_PARAMETER_LEN; | |
607 | } | |
608 | ||
609 | /** | |
610 | * @fn eigrp_hello_encode | |
611 | * | |
612 | * @param[in] ei pointer to interface hello packet came in on | |
613 | * @param[in] s packet stream TLV is stored to | |
614 | * @param[in] ack if non-zero, neigbors sequence packet to ack | |
615 | * @param[in] flags type of hello packet | |
616 | * @param[in] nbr_addr pointer to neighbor address for Peer | |
617 | * Termination TLV | |
618 | * | |
619 | * @return eigrp_packet pointer initialize hello packet | |
620 | * | |
621 | * @par | |
622 | * Allocate an EIGRP hello packet, and add in the the approperate TLVs | |
623 | * | |
624 | */ | |
625 | static struct eigrp_packet *eigrp_hello_encode(struct eigrp_interface *ei, | |
626 | in_addr_t addr, uint32_t ack, | |
627 | uint8_t flags, | |
628 | struct in_addr *nbr_addr) | |
629 | { | |
630 | struct eigrp_packet *ep; | |
631 | uint16_t length = EIGRP_HEADER_LEN; | |
632 | ||
633 | // allocate a new packet to be sent | |
634 | ep = eigrp_packet_new(EIGRP_PACKET_MTU(ei->ifp->mtu), NULL); | |
635 | ||
636 | if (ep) { | |
637 | // encode common header feilds | |
638 | eigrp_packet_header_init(EIGRP_OPC_HELLO, ei->eigrp, ep->s, 0, | |
639 | 0, ack); | |
640 | ||
641 | // encode Authentication TLV | |
642 | if ((ei->params.auth_type == EIGRP_AUTH_TYPE_MD5) | |
643 | && (ei->params.auth_keychain != NULL)) { | |
644 | length += eigrp_add_authTLV_MD5_to_stream(ep->s, ei); | |
645 | } else if ((ei->params.auth_type == EIGRP_AUTH_TYPE_SHA256) | |
646 | && (ei->params.auth_keychain != NULL)) { | |
647 | length += eigrp_add_authTLV_SHA256_to_stream(ep->s, ei); | |
648 | } | |
649 | ||
650 | /* encode appropriate parameters to Hello packet */ | |
651 | if (flags & EIGRP_HELLO_GRACEFUL_SHUTDOWN) | |
652 | length += eigrp_hello_parameter_encode( | |
653 | ei, ep->s, EIGRP_HELLO_GRACEFUL_SHUTDOWN); | |
654 | else | |
655 | length += eigrp_hello_parameter_encode( | |
656 | ei, ep->s, EIGRP_HELLO_NORMAL); | |
657 | ||
658 | // figure out the version of code we're running | |
659 | length += eigrp_sw_version_encode(ep->s); | |
660 | ||
661 | if (flags & EIGRP_HELLO_ADD_SEQUENCE) { | |
662 | length += eigrp_sequence_encode(ep->s); | |
663 | length += eigrp_next_sequence_encode(ep->s); | |
664 | } | |
665 | ||
666 | // add in the TID list if doing multi-topology | |
667 | length += eigrp_tidlist_encode(ep->s); | |
668 | ||
669 | /* encode Peer Termination TLV if needed */ | |
670 | if (flags & EIGRP_HELLO_GRACEFUL_SHUTDOWN_NBR) | |
671 | length += | |
672 | eigrp_peer_termination_encode(ep->s, nbr_addr); | |
673 | ||
674 | // Set packet length | |
675 | ep->length = length; | |
676 | ||
677 | // set soruce address for the hello packet | |
678 | ep->dst.s_addr = addr; | |
679 | ||
680 | if ((ei->params.auth_type == EIGRP_AUTH_TYPE_MD5) | |
681 | && (ei->params.auth_keychain != NULL)) { | |
682 | eigrp_make_md5_digest(ei, ep->s, | |
683 | EIGRP_AUTH_BASIC_HELLO_FLAG); | |
684 | } else if ((ei->params.auth_type == EIGRP_AUTH_TYPE_SHA256) | |
685 | && (ei->params.auth_keychain != NULL)) { | |
686 | eigrp_make_sha256_digest(ei, ep->s, | |
687 | EIGRP_AUTH_BASIC_HELLO_FLAG); | |
688 | } | |
689 | ||
690 | // EIGRP Checksum | |
691 | eigrp_packet_checksum(ei, ep->s, length); | |
692 | } | |
693 | ||
694 | return (ep); | |
695 | } | |
696 | ||
697 | /** | |
698 | * @fn eigrp_hello_send | |
699 | * | |
700 | * @param[in] nbr neighbor the ACK should be sent to | |
701 | * | |
702 | * @return void | |
703 | * | |
704 | * @par | |
705 | * Send (unicast) a hello packet with the destination address | |
706 | * associated with the neighbor. The eigrp header ACK feild will be | |
707 | * updated to the neighbor's sequence number to acknolodge any | |
708 | * outstanding packets | |
709 | */ | |
710 | void eigrp_hello_send_ack(struct eigrp_neighbor *nbr) | |
711 | { | |
712 | struct eigrp_packet *ep; | |
713 | ||
714 | /* if packet succesfully created, add it to the interface queue */ | |
715 | ep = eigrp_hello_encode(nbr->ei, nbr->src.s_addr, | |
716 | nbr->recv_sequence_number, EIGRP_HELLO_NORMAL, | |
717 | NULL); | |
718 | ||
719 | if (ep) { | |
720 | if (IS_DEBUG_EIGRP_PACKET(0, SEND)) | |
721 | zlog_debug("Queueing [Hello] Ack Seq [%u] nbr [%s]", | |
722 | nbr->recv_sequence_number, | |
723 | inet_ntoa(nbr->src)); | |
724 | ||
725 | /* Add packet to the top of the interface output queue*/ | |
726 | eigrp_fifo_push(nbr->ei->obuf, ep); | |
727 | ||
728 | /* Hook thread to write packet. */ | |
729 | if (nbr->ei->on_write_q == 0) { | |
730 | listnode_add(nbr->ei->eigrp->oi_write_q, nbr->ei); | |
731 | nbr->ei->on_write_q = 1; | |
732 | } | |
733 | thread_add_write(master, eigrp_write, nbr->ei->eigrp, | |
734 | nbr->ei->eigrp->fd, &nbr->ei->eigrp->t_write); | |
735 | } | |
736 | } | |
737 | ||
738 | /** | |
739 | * @fn eigrp_hello_send | |
740 | * | |
741 | * @param[in] ei pointer to interface hello should be sent | |
742 | * @param[in] flags type of hello packet | |
743 | * @param[in] nbr_addr pointer to neighbor address for Peer | |
744 | * Termination TLV | |
745 | * | |
746 | * @return void | |
747 | * | |
748 | * @par | |
749 | * Build and enqueue a generic (multicast) periodic hello packet for | |
750 | * sending. If no packets are currently queues, the packet will be | |
751 | * sent immadiatly | |
752 | */ | |
753 | void eigrp_hello_send(struct eigrp_interface *ei, uint8_t flags, | |
754 | struct in_addr *nbr_addr) | |
755 | { | |
756 | struct eigrp_packet *ep = NULL; | |
757 | ||
758 | /* If this is passive interface, do not send EIGRP Hello. | |
759 | if ((EIGRP_IF_PASSIVE_STATUS (ei) == EIGRP_IF_PASSIVE) || | |
760 | (ei->type != EIGRP_IFTYPE_NBMA)) | |
761 | return; | |
762 | */ | |
763 | ||
764 | if (IS_DEBUG_EIGRP_PACKET(0, SEND)) | |
765 | zlog_debug("Queueing [Hello] Interface(%s)", IF_NAME(ei)); | |
766 | ||
767 | /* if packet was succesfully created, then add it to the interface queue | |
768 | */ | |
769 | ep = eigrp_hello_encode(ei, htonl(EIGRP_MULTICAST_ADDRESS), 0, flags, | |
770 | nbr_addr); | |
771 | ||
772 | if (ep) { | |
773 | // Add packet to the top of the interface output queue | |
774 | eigrp_fifo_push(ei->obuf, ep); | |
775 | ||
776 | /* Hook thread to write packet. */ | |
777 | if (ei->on_write_q == 0) { | |
778 | listnode_add(ei->eigrp->oi_write_q, ei); | |
779 | ei->on_write_q = 1; | |
780 | } | |
781 | ||
782 | if (ei->eigrp->t_write == NULL) { | |
783 | if (flags & EIGRP_HELLO_GRACEFUL_SHUTDOWN) { | |
784 | thread_execute(master, eigrp_write, ei->eigrp, | |
785 | ei->eigrp->fd); | |
786 | } else { | |
787 | thread_add_write(master, eigrp_write, ei->eigrp, | |
788 | ei->eigrp->fd, | |
789 | &ei->eigrp->t_write); | |
790 | } | |
791 | } | |
792 | } | |
793 | } |