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eigrpd: Setup eigrp to send FRR version
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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
58 /* Packet Type String. */
59 static const struct message eigrp_general_tlv_type_str[] = {
60 {EIGRP_TLV_PARAMETER, "PARAMETER"},
61 {EIGRP_TLV_AUTH, "AUTH"},
62 {EIGRP_TLV_SEQ, "SEQ"},
63 {EIGRP_TLV_SW_VERSION, "SW_VERSION"},
64 {EIGRP_TLV_NEXT_MCAST_SEQ, "NEXT_MCAST_SEQ"},
65 {EIGRP_TLV_PEER_TERMINATION, "PEER_TERMINATION"},
66 {EIGRP_TLV_PEER_MTRLIST, "PEER_MTRLIST"},
67 {EIGRP_TLV_PEER_TIDLIST, "PEER_TIDLIST"},
68 {0}};
69
70
71 /*
72 * @fn eigrp_hello_timer
73 *
74 * @param[in] thread current execution thread timer is associated with
75 *
76 * @return int always returns 0
77 *
78 * @par
79 * Called once per "hello" time interval, default 5 seconds
80 * Sends hello packet via multicast for all interfaces eigrp
81 * is configured for
82 */
83 int eigrp_hello_timer(struct thread *thread)
84 {
85 struct eigrp_interface *ei;
86
87 ei = THREAD_ARG(thread);
88 ei->t_hello = NULL;
89
90 if (IS_DEBUG_EIGRP(0, TIMERS))
91 zlog_debug("Start Hello Timer (%s) Expire [%u]", IF_NAME(ei),
92 EIGRP_IF_PARAM(ei, v_hello));
93
94 /* Sending hello packet. */
95 eigrp_hello_send(ei, EIGRP_HELLO_NORMAL, NULL);
96
97 /* Hello timer set. */
98 ei->t_hello = NULL;
99 thread_add_timer(master, eigrp_hello_timer, ei,
100 EIGRP_IF_PARAM(ei, v_hello), &ei->t_hello);
101
102 return 0;
103 }
104
105 /**
106 * @fn eigrp_hello_parameter_decode
107 *
108 * @param[in] nbr neighbor the ACK should be sent to
109 * @param[in] param pointer packet TLV is stored to
110 *
111 * @return u_int16_t number of bytes added to packet stream
112 *
113 * @par
114 * Encode Parameter TLV, used to convey metric weights and the hold time.
115 *
116 * @usage
117 * Note the addition of K6 for the new extended metrics, and does not apply to
118 * older TLV packet formats.
119 */
120 static struct eigrp_neighbor *
121 eigrp_hello_parameter_decode(struct eigrp_neighbor *nbr,
122 struct eigrp_tlv_hdr_type *tlv)
123 {
124 struct eigrp *eigrp = nbr->ei->eigrp;
125 struct TLV_Parameter_Type *param = (struct TLV_Parameter_Type *)tlv;
126
127 /* copy over the values passed in by the neighbor */
128 nbr->K1 = param->K1;
129 nbr->K2 = param->K2;
130 nbr->K3 = param->K3;
131 nbr->K4 = param->K4;
132 nbr->K5 = param->K5;
133 nbr->K6 = param->K6;
134 nbr->v_holddown = ntohs(param->hold_time);
135
136 /*
137 * Check K1-K5 have the correct values to be able to become neighbors
138 * K6 does not have to match
139 */
140 if ((eigrp->k_values[0] == nbr->K1) && (eigrp->k_values[1] == nbr->K2)
141 && (eigrp->k_values[2] == nbr->K3)
142 && (eigrp->k_values[3] == nbr->K4)
143 && (eigrp->k_values[4] == nbr->K5)) {
144
145 if (eigrp_nbr_state_get(nbr) == EIGRP_NEIGHBOR_DOWN) {
146 zlog_info("Neighbor %s (%s) is pending: new adjacency",
147 inet_ntoa(nbr->src),
148 ifindex2ifname(nbr->ei->ifp->ifindex,
149 VRF_DEFAULT));
150
151 /* Expedited hello sent */
152 eigrp_hello_send(nbr->ei, EIGRP_HELLO_NORMAL, NULL);
153
154 // if(ntohl(nbr->ei->address->u.prefix4.s_addr) >
155 // ntohl(nbr->src.s_addr))
156 eigrp_update_send_init(nbr);
157
158 eigrp_nbr_state_set(nbr, EIGRP_NEIGHBOR_PENDING);
159 }
160 } else {
161 if (eigrp_nbr_state_get(nbr) != EIGRP_NEIGHBOR_DOWN) {
162 if ((param->K1 & param->K2 & param->K3 & param->K4
163 & param->K5)
164 == 255) {
165 zlog_info(
166 "Neighbor %s (%s) is down: Interface PEER-TERMINATION received",
167 inet_ntoa(nbr->src),
168 ifindex2ifname(nbr->ei->ifp->ifindex,
169 VRF_DEFAULT));
170 eigrp_nbr_delete(nbr);
171 return NULL;
172 } else {
173 zlog_info(
174 "Neighbor %s (%s) going down: Kvalue mismatch",
175 inet_ntoa(nbr->src),
176 ifindex2ifname(nbr->ei->ifp->ifindex,
177 VRF_DEFAULT));
178 eigrp_nbr_state_set(nbr, EIGRP_NEIGHBOR_DOWN);
179 }
180 }
181 }
182
183 return nbr;
184 }
185
186 static u_char
187 eigrp_hello_authentication_decode(struct stream *s,
188 struct eigrp_tlv_hdr_type *tlv_header,
189 struct eigrp_neighbor *nbr)
190 {
191 struct TLV_MD5_Authentication_Type *md5;
192
193 md5 = (struct TLV_MD5_Authentication_Type *)tlv_header;
194
195 if (md5->auth_type == EIGRP_AUTH_TYPE_MD5)
196 return eigrp_check_md5_digest(s, md5, nbr,
197 EIGRP_AUTH_BASIC_HELLO_FLAG);
198 else if (md5->auth_type == EIGRP_AUTH_TYPE_SHA256)
199 return eigrp_check_sha256_digest(
200 s, (struct TLV_SHA256_Authentication_Type *)tlv_header,
201 nbr, EIGRP_AUTH_BASIC_HELLO_FLAG);
202
203 return 0;
204 }
205
206 /**
207 * @fn eigrp_sw_version_decode
208 *
209 * @param[in] nbr neighbor the ACK shoudl be sent to
210 * @param[in] param pointer to TLV software version information
211 *
212 * @return void
213 *
214 * @par
215 * Read the software version in the specified location.
216 * This consists of two bytes of OS version, and two bytes of EIGRP
217 * revision number.
218 */
219 static void eigrp_sw_version_decode(struct eigrp_neighbor *nbr,
220 struct eigrp_tlv_hdr_type *tlv)
221 {
222 struct TLV_Software_Type *version = (struct TLV_Software_Type *)tlv;
223
224 nbr->os_rel_major = version->vender_major;
225 nbr->os_rel_minor = version->vender_minor;
226 nbr->tlv_rel_major = version->eigrp_major;
227 nbr->tlv_rel_minor = version->eigrp_minor;
228 return;
229 }
230
231 /**
232 * @fn eigrp_peer_termination_decode
233 *
234 * @param[in] nbr neighbor the ACK shoudl be sent to
235 * @param[in] tlv pointer to TLV software version information
236 *
237 * @return void
238 *
239 * @par
240 * Read the address in the TLV and match to out address. If
241 * a match is found, move the sending neighbor to the down state. If
242 * out address is not in the TLV, then ignore the peer termination
243 */
244 static void eigrp_peer_termination_decode(struct eigrp_neighbor *nbr,
245 struct eigrp_tlv_hdr_type *tlv)
246 {
247 struct TLV_Peer_Termination_type *param =
248 (struct TLV_Peer_Termination_type *)tlv;
249
250 uint32_t my_ip = nbr->ei->address->u.prefix4.s_addr;
251 uint32_t received_ip = param->neighbor_ip;
252
253 if (my_ip == received_ip) {
254 zlog_info("Neighbor %s (%s) is down: Peer Termination received",
255 inet_ntoa(nbr->src),
256 ifindex2ifname(nbr->ei->ifp->ifindex, VRF_DEFAULT));
257 /* set neighbor to DOWN */
258 nbr->state = EIGRP_NEIGHBOR_DOWN;
259 /* delete neighbor */
260 eigrp_nbr_delete(nbr);
261 }
262 }
263
264 /**
265 * @fn eigrp_peer_termination_encode
266 *
267 * @param[in,out] s packet stream TLV is stored to
268 * @param[in] nbr_addr pointer to neighbor address for Peer
269 * Termination TLV
270 *
271 * @return u_int16_t number of bytes added to packet stream
272 *
273 * @par
274 * Function used to encode Peer Termination TLV to Hello packet.
275 */
276 static u_int16_t eigrp_peer_termination_encode(struct stream *s,
277 struct in_addr *nbr_addr)
278 {
279 u_int16_t length = EIGRP_TLV_PEER_TERMINATION_LEN;
280
281 /* fill in type and length */
282 stream_putw(s, EIGRP_TLV_PEER_TERMINATION);
283 stream_putw(s, length);
284
285 /* fill in unknown field 0x04 */
286 stream_putc(s, 0x04);
287
288 /* finally neighbor IP address */
289 stream_put_ipv4(s, nbr_addr->s_addr);
290
291 return (length);
292 }
293
294 /*
295 * @fn eigrp_hello_receive
296 *
297 * @param[in] eigrp eigrp routing process
298 * @param[in] iph pointer to ip header
299 * @param[in] eigrph pointer to eigrp header
300 * @param[in] s input ip stream
301 * @param[in] ei eigrp interface packet arrived on
302 * @param[in] size size of eigrp packet
303 *
304 * @return void
305 *
306 * @par
307 * This is the main worker function for processing hello packets. It
308 * will validate the peer associated with the src ip address of the ip
309 * header, and then decode each of the general TLVs which the packet
310 * may contain.
311 *
312 * @usage
313 * Not all TLVs are current decoder. This is a work in progress..
314 */
315 void eigrp_hello_receive(struct eigrp *eigrp, struct ip *iph,
316 struct eigrp_header *eigrph, struct stream *s,
317 struct eigrp_interface *ei, int size)
318 {
319 struct eigrp_tlv_hdr_type *tlv_header;
320 struct eigrp_neighbor *nbr;
321 uint16_t type;
322 uint16_t length;
323
324 /* get neighbor struct */
325 nbr = eigrp_nbr_get(ei, eigrph, iph);
326
327 /* neighbor must be valid, eigrp_nbr_get creates if none existed */
328 assert(nbr);
329
330 if (IS_DEBUG_EIGRP_PACKET(eigrph->opcode - 1, RECV))
331 zlog_debug("Processing Hello size[%u] int(%s) nbr(%s)", size,
332 ifindex2ifname(nbr->ei->ifp->ifindex, VRF_DEFAULT),
333 inet_ntoa(nbr->src));
334
335 size -= EIGRP_HEADER_LEN;
336 if (size < 0)
337 return;
338
339 tlv_header = (struct eigrp_tlv_hdr_type *)eigrph->tlv;
340
341 do {
342 type = ntohs(tlv_header->type);
343 length = ntohs(tlv_header->length);
344
345 if ((length > 0) && (length <= size)) {
346 if (IS_DEBUG_EIGRP_PACKET(0, RECV))
347 zlog_debug(
348 " General TLV(%s)",
349 lookup_msg(eigrp_general_tlv_type_str,
350 type, NULL));
351
352 // determine what General TLV is being processed
353 switch (type) {
354 case EIGRP_TLV_PARAMETER:
355 nbr = eigrp_hello_parameter_decode(nbr,
356 tlv_header);
357 if (!nbr)
358 return;
359 break;
360 case EIGRP_TLV_AUTH: {
361 if (eigrp_hello_authentication_decode(
362 s, tlv_header, nbr)
363 == 0)
364 return;
365 else
366 break;
367 break;
368 }
369 case EIGRP_TLV_SEQ:
370 break;
371 case EIGRP_TLV_SW_VERSION:
372 eigrp_sw_version_decode(nbr, tlv_header);
373 break;
374 case EIGRP_TLV_NEXT_MCAST_SEQ:
375 break;
376 case EIGRP_TLV_PEER_TERMINATION:
377 eigrp_peer_termination_decode(nbr, tlv_header);
378 return;
379 break;
380 case EIGRP_TLV_PEER_MTRLIST:
381 case EIGRP_TLV_PEER_TIDLIST:
382 break;
383 default:
384 break;
385 }
386 }
387
388 tlv_header = (struct eigrp_tlv_hdr_type *)(((char *)tlv_header)
389 + length);
390 size -= length;
391
392 } while (size > 0);
393
394
395 /*If received packet is hello with Parameter TLV*/
396 if (ntohl(eigrph->ack) == 0) {
397 /* increment statistics. */
398 ei->hello_in++;
399 if (nbr)
400 eigrp_nbr_state_update(nbr);
401 }
402
403 if (IS_DEBUG_EIGRP_PACKET(0, RECV))
404 zlog_debug("Hello Packet received from %s",
405 inet_ntoa(nbr->src));
406 }
407
408 u_int32_t FRR_MAJOR;
409 u_int32_t FRR_MINOR;
410
411 void eigrp_sw_version_initialize(void)
412 {
413 char ver_string[] = VERSION;
414 char *dash = strstr(ver_string, "-");
415
416 if (dash)
417 dash[0] = '\0';
418
419 sscanf(ver_string, "%d.%d", &FRR_MAJOR, &FRR_MINOR);
420 }
421
422 /**
423 * @fn eigrp_sw_version_encode
424 *
425 * @param[in,out] s packet stream TLV is stored to
426 *
427 * @return u_int16_t number of bytes added to packet stream
428 *
429 * @par
430 * Store the software version in the specified location.
431 * This consists of two bytes of OS version, and two bytes of EIGRP
432 * revision number.
433 */
434 static u_int16_t eigrp_sw_version_encode(struct stream *s)
435 {
436 u_int16_t length = EIGRP_TLV_SW_VERSION_LEN;
437
438 // setup the tlv fields
439 stream_putw(s, EIGRP_TLV_SW_VERSION);
440 stream_putw(s, length);
441
442 // encode the version of quagga we're running
443 // DVS: need to figure out a cleaner way to do this
444 stream_putc(s, FRR_MAJOR); //!< major os version
445 stream_putc(s, FRR_MINOR); //!< minor os version
446
447 /* and the core eigrp version */
448 stream_putc(s, EIGRP_MAJOR_VERSION);
449 stream_putc(s, EIGRP_MINOR_VERSION);
450
451 return (length);
452 }
453
454 /**
455 * @fn eigrp_tidlist_encode
456 *
457 * @param[in,out] s packet stream TLV is stored to
458 *
459 * @return void
460 *
461 * @par
462 * If doing mutli-topology, then store the supported TID list.
463 * This is currently a place holder function
464 */
465 static u_int16_t eigrp_tidlist_encode(struct stream *s)
466 {
467 // u_int16_t length = EIGRP_TLV_SW_VERSION_LEN;
468 return 0;
469 }
470
471 /**
472 * @fn eigrp_sequence_encode
473 *
474 * @param[in,out] s packet stream TLV is stored to
475 *
476 * @return u_int16_t number of bytes added to packet stream
477 *
478 * @par
479 * Part of conditional receive process
480 *
481 */
482 static u_int16_t eigrp_sequence_encode(struct stream *s)
483 {
484 u_int16_t length = EIGRP_TLV_SEQ_BASE_LEN;
485 struct eigrp *eigrp;
486 struct eigrp_interface *ei;
487 struct listnode *node, *node2, *nnode2;
488 struct eigrp_neighbor *nbr;
489 size_t backup_end, size_end;
490 int found;
491
492 eigrp = eigrp_lookup();
493 if (eigrp == NULL) {
494 return 0;
495 }
496
497 // add in the parameters TLV
498 backup_end = stream_get_endp(s);
499 stream_putw(s, EIGRP_TLV_SEQ);
500 size_end = s->endp;
501 stream_putw(s, 0x0000);
502 stream_putc(s, IPV4_MAX_BYTELEN);
503
504 found = 0;
505 for (ALL_LIST_ELEMENTS_RO(eigrp->eiflist, node, ei)) {
506 for (ALL_LIST_ELEMENTS(ei->nbrs, node2, nnode2, nbr)) {
507 if (nbr->multicast_queue->count > 0) {
508 length += (u_int16_t)stream_put_ipv4(
509 s, nbr->src.s_addr);
510 found = 1;
511 }
512 }
513 }
514
515 if (found == 0) {
516 stream_set_endp(s, backup_end);
517 return 0;
518 }
519
520 backup_end = stream_get_endp(s);
521 stream_set_endp(s, size_end);
522 stream_putw(s, length);
523 stream_set_endp(s, backup_end);
524
525 return length;
526 }
527
528 /**
529 * @fn eigrp_sequence_encode
530 *
531 * @param[in,out] s packet stream TLV is stored to
532 *
533 * @return u_int16_t number of bytes added to packet stream
534 *
535 * @par
536 * Part of conditional receive process
537 *
538 */
539 static u_int16_t eigrp_next_sequence_encode(struct stream *s)
540 {
541 u_int16_t length = EIGRP_NEXT_SEQUENCE_TLV_SIZE;
542 struct eigrp *eigrp;
543
544 eigrp = eigrp_lookup();
545 if (eigrp == NULL) {
546 return 0;
547 }
548
549 // add in the parameters TLV
550 stream_putw(s, EIGRP_TLV_NEXT_MCAST_SEQ);
551 stream_putw(s, EIGRP_NEXT_SEQUENCE_TLV_SIZE);
552 stream_putl(s, eigrp->sequence_number + 1);
553
554 return length;
555 }
556
557 /**
558 * @fn eigrp_hello_parameter_encode
559 *
560 * @param[in] ei pointer to interface hello packet came in on
561 * @param[in,out] s packet stream TLV is stored to
562 *
563 * @return u_int16_t number of bytes added to packet stream
564 *
565 * @par
566 * Encode Parameter TLV, used to convey metric weights and the hold time.
567 *
568 * @usage
569 * Note the addition of K6 for the new extended metrics, and does not apply to
570 * older TLV packet formats.
571 */
572 static u_int16_t eigrp_hello_parameter_encode(struct eigrp_interface *ei,
573 struct stream *s, u_char flags)
574 {
575 u_int16_t length = EIGRP_TLV_PARAMETER_LEN;
576
577 // add in the parameters TLV
578 stream_putw(s, EIGRP_TLV_PARAMETER);
579 stream_putw(s, EIGRP_TLV_PARAMETER_LEN);
580
581 // if graceful shutdown is needed to be announced, send all 255 in K
582 // values
583 if (flags & EIGRP_HELLO_GRACEFUL_SHUTDOWN) {
584 stream_putc(s, 0xff); /* K1 */
585 stream_putc(s, 0xff); /* K2 */
586 stream_putc(s, 0xff); /* K3 */
587 stream_putc(s, 0xff); /* K4 */
588 stream_putc(s, 0xff); /* K5 */
589 stream_putc(s, 0xff); /* K6 */
590 } else // set k values
591 {
592 stream_putc(s, ei->eigrp->k_values[0]); /* K1 */
593 stream_putc(s, ei->eigrp->k_values[1]); /* K2 */
594 stream_putc(s, ei->eigrp->k_values[2]); /* K3 */
595 stream_putc(s, ei->eigrp->k_values[3]); /* K4 */
596 stream_putc(s, ei->eigrp->k_values[4]); /* K5 */
597 stream_putc(s, ei->eigrp->k_values[5]); /* K6 */
598 }
599
600 // and set hold time value..
601 stream_putw(s, IF_DEF_PARAMS(ei->ifp)->v_wait);
602
603 return length;
604 }
605
606 /**
607 * @fn eigrp_hello_encode
608 *
609 * @param[in] ei pointer to interface hello packet came in on
610 * @param[in] s packet stream TLV is stored to
611 * @param[in] ack if non-zero, neigbors sequence packet to ack
612 * @param[in] flags type of hello packet
613 * @param[in] nbr_addr pointer to neighbor address for Peer
614 * Termination TLV
615 *
616 * @return eigrp_packet pointer initialize hello packet
617 *
618 * @par
619 * Allocate an EIGRP hello packet, and add in the the approperate TLVs
620 *
621 */
622 static struct eigrp_packet *eigrp_hello_encode(struct eigrp_interface *ei,
623 in_addr_t addr, u_int32_t ack,
624 u_char flags,
625 struct in_addr *nbr_addr)
626 {
627 struct eigrp_packet *ep;
628 u_int16_t length = EIGRP_HEADER_LEN;
629
630 // allocate a new packet to be sent
631 ep = eigrp_packet_new(ei->ifp->mtu, NULL);
632
633 if (ep) {
634 // encode common header feilds
635 eigrp_packet_header_init(EIGRP_OPC_HELLO, ei->eigrp, ep->s, 0, 0, ack);
636
637 // encode Authentication TLV
638 if ((IF_DEF_PARAMS(ei->ifp)->auth_type == EIGRP_AUTH_TYPE_MD5)
639 && (IF_DEF_PARAMS(ei->ifp)->auth_keychain != NULL)) {
640 length += eigrp_add_authTLV_MD5_to_stream(ep->s, ei);
641 } else if ((IF_DEF_PARAMS(ei->ifp)->auth_type
642 == EIGRP_AUTH_TYPE_SHA256)
643 && (IF_DEF_PARAMS(ei->ifp)->auth_keychain != NULL)) {
644 length += eigrp_add_authTLV_SHA256_to_stream(ep->s, ei);
645 }
646
647 /* encode appropriate parameters to Hello packet */
648 if (flags & EIGRP_HELLO_GRACEFUL_SHUTDOWN)
649 length += eigrp_hello_parameter_encode(
650 ei, ep->s, EIGRP_HELLO_GRACEFUL_SHUTDOWN);
651 else
652 length += eigrp_hello_parameter_encode(
653 ei, ep->s, EIGRP_HELLO_NORMAL);
654
655 // figure out the version of code we're running
656 length += eigrp_sw_version_encode(ep->s);
657
658 if (flags & EIGRP_HELLO_ADD_SEQUENCE) {
659 length += eigrp_sequence_encode(ep->s);
660 length += eigrp_next_sequence_encode(ep->s);
661 }
662
663 // add in the TID list if doing multi-topology
664 length += eigrp_tidlist_encode(ep->s);
665
666 /* encode Peer Termination TLV if needed */
667 if (flags & EIGRP_HELLO_GRACEFUL_SHUTDOWN_NBR)
668 length +=
669 eigrp_peer_termination_encode(ep->s, nbr_addr);
670
671 // Set packet length
672 ep->length = length;
673
674 // set soruce address for the hello packet
675 ep->dst.s_addr = addr;
676
677 if ((IF_DEF_PARAMS(ei->ifp)->auth_type == EIGRP_AUTH_TYPE_MD5)
678 && (IF_DEF_PARAMS(ei->ifp)->auth_keychain != NULL)) {
679 eigrp_make_md5_digest(ei, ep->s,
680 EIGRP_AUTH_BASIC_HELLO_FLAG);
681 } else if ((IF_DEF_PARAMS(ei->ifp)->auth_type
682 == EIGRP_AUTH_TYPE_SHA256)
683 && (IF_DEF_PARAMS(ei->ifp)->auth_keychain != NULL)) {
684 eigrp_make_sha256_digest(ei, ep->s,
685 EIGRP_AUTH_BASIC_HELLO_FLAG);
686 }
687
688 // EIGRP Checksum
689 eigrp_packet_checksum(ei, ep->s, length);
690 }
691
692 return (ep);
693 }
694
695 /**
696 * @fn eigrp_hello_send
697 *
698 * @param[in] nbr neighbor the ACK should be sent to
699 *
700 * @return void
701 *
702 * @par
703 * Send (unicast) a hello packet with the destination address
704 * associated with the neighbor. The eigrp header ACK feild will be
705 * updated to the neighbor's sequence number to acknolodge any
706 * outstanding packets
707 */
708 void eigrp_hello_send_ack(struct eigrp_neighbor *nbr)
709 {
710 struct eigrp_packet *ep;
711
712 /* if packet succesfully created, add it to the interface queue */
713 ep = eigrp_hello_encode(nbr->ei, nbr->src.s_addr,
714 nbr->recv_sequence_number, EIGRP_HELLO_NORMAL,
715 NULL);
716
717 if (ep) {
718 if (IS_DEBUG_EIGRP_PACKET(0, SEND))
719 zlog_debug("Queueing [Hello] Ack Seq [%u] nbr [%s]",
720 nbr->recv_sequence_number,
721 inet_ntoa(nbr->src));
722
723 /* Add packet to the top of the interface output queue*/
724 eigrp_fifo_push(nbr->ei->obuf, ep);
725
726 /* Hook thread to write packet. */
727 if (nbr->ei->on_write_q == 0) {
728 listnode_add(nbr->ei->eigrp->oi_write_q, nbr->ei);
729 nbr->ei->on_write_q = 1;
730 }
731 thread_add_write(master, eigrp_write, nbr->ei->eigrp,
732 nbr->ei->eigrp->fd, &nbr->ei->eigrp->t_write);
733 }
734 }
735
736 /**
737 * @fn eigrp_hello_send
738 *
739 * @param[in] ei pointer to interface hello should be sent
740 * @param[in] flags type of hello packet
741 * @param[in] nbr_addr pointer to neighbor address for Peer
742 * Termination TLV
743 *
744 * @return void
745 *
746 * @par
747 * Build and enqueue a generic (multicast) periodic hello packet for
748 * sending. If no packets are currently queues, the packet will be
749 * sent immadiatly
750 */
751 void eigrp_hello_send(struct eigrp_interface *ei, u_char flags,
752 struct in_addr *nbr_addr)
753 {
754 struct eigrp_packet *ep = NULL;
755
756 /* If this is passive interface, do not send EIGRP Hello.
757 if ((EIGRP_IF_PASSIVE_STATUS (ei) == EIGRP_IF_PASSIVE) ||
758 (ei->type != EIGRP_IFTYPE_NBMA))
759 return;
760 */
761
762 if (IS_DEBUG_EIGRP_PACKET(0, SEND))
763 zlog_debug("Queueing [Hello] Interface(%s)", IF_NAME(ei));
764
765 /* if packet was succesfully created, then add it to the interface queue
766 */
767 ep = eigrp_hello_encode(ei, htonl(EIGRP_MULTICAST_ADDRESS), 0, flags,
768 nbr_addr);
769
770 if (ep) {
771 // Add packet to the top of the interface output queue
772 eigrp_fifo_push(ei->obuf, ep);
773
774 /* Hook thread to write packet. */
775 if (ei->on_write_q == 0) {
776 listnode_add(ei->eigrp->oi_write_q, ei);
777 ei->on_write_q = 1;
778 }
779
780 if (ei->eigrp->t_write == NULL) {
781 if (flags & EIGRP_HELLO_GRACEFUL_SHUTDOWN) {
782 thread_execute(master, eigrp_write, ei->eigrp,
783 ei->eigrp->fd);
784 } else {
785 thread_add_write(master, eigrp_write, ei->eigrp,
786 ei->eigrp->fd,
787 &ei->eigrp->t_write);
788 }
789 }
790 }
791 }
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