2 * IS-IS Rout(e)ing protocol - isis_pdu.c
5 * Copyright (C) 2001,2002 Sampo Saaristo
6 * Tampere University of Technology
7 * Institute of Communications Engineering
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public Licenseas published by the Free
11 * Software Foundation; either version 2 of the License, or (at your option)
14 * This program is distributed in the hope that it will be useful,but WITHOUT
15 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
38 #include "isisd/dict.h"
39 #include "isisd/include-netbsd/iso.h"
40 #include "isisd/isis_constants.h"
41 #include "isisd/isis_common.h"
42 #include "isisd/isis_flags.h"
43 #include "isisd/isis_adjacency.h"
44 #include "isisd/isis_circuit.h"
45 #include "isisd/isis_network.h"
46 #include "isisd/isis_misc.h"
47 #include "isisd/isis_dr.h"
48 #include "isisd/isis_tlv.h"
49 #include "isisd/isisd.h"
50 #include "isisd/isis_dynhn.h"
51 #include "isisd/isis_lsp.h"
52 #include "isisd/isis_pdu.h"
53 #include "isisd/iso_checksum.h"
54 #include "isisd/isis_csm.h"
55 #include "isisd/isis_events.h"
56 #include "isisd/isis_te.h"
58 #define ISIS_MINIMUM_FIXED_HDR_LEN 15
59 #define ISIS_MIN_PDU_LEN 13 /* partial seqnum pdu with id_len=2 */
65 /* Utility mask array. */
66 static const u_char maskbit[] = {
67 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff
75 * Compares two sets of area addresses
78 area_match (struct list *left, struct list *right)
80 struct area_addr *addr1, *addr2;
81 struct listnode *node1, *node2;
83 for (ALL_LIST_ELEMENTS_RO (left, node1, addr1))
85 for (ALL_LIST_ELEMENTS_RO (right, node2, addr2))
87 if (addr1->addr_len == addr2->addr_len &&
88 !memcmp (addr1->area_addr, addr2->area_addr, (int) addr1->addr_len))
93 return 0; /* mismatch */
97 * Check if ip2 is in the ip1's network (function like Prefix.h:prefix_match() )
98 * param ip1 the IS interface ip address structure
99 * param ip2 the IIH's ip address
100 * return 0 the IIH's IP is not in the IS's subnetwork
101 * 1 the IIH's IP is in the IS's subnetwork
104 ip_same_subnet (struct prefix_ipv4 *ip1, struct in_addr *ip2)
106 u_char *addr1, *addr2;
107 int shift, offset, offsetloop;
110 addr1 = (u_char *) & ip1->prefix.s_addr;
111 addr2 = (u_char *) & ip2->s_addr;
112 len = ip1->prefixlen;
115 offsetloop = offset = len / PNBBY;
118 if (addr1[offsetloop] != addr2[offsetloop])
122 if (maskbit[shift] & (addr1[offset] ^ addr2[offset]))
125 return 1; /* match */
129 * Compares two set of ip addresses
130 * param left the local interface's ip addresses
131 * param right the iih interface's ip address
136 ip_match (struct list *left, struct list *right)
138 struct prefix_ipv4 *ip1;
140 struct listnode *node1, *node2;
142 if ((left == NULL) || (right == NULL))
145 for (ALL_LIST_ELEMENTS_RO (left, node1, ip1))
147 for (ALL_LIST_ELEMENTS_RO (right, node2, ip2))
149 if (ip_same_subnet (ip1, ip2))
151 return 1; /* match */
160 * Checks whether we should accept a PDU of given level
163 accept_level (int level, int circuit_t)
165 int retval = ((circuit_t & level) == level); /* simple approach */
171 * Verify authentication information
172 * Support cleartext and HMAC MD5 authentication
175 authentication_check (struct isis_passwd *remote, struct isis_passwd *local,
176 struct stream *stream, uint32_t auth_tlv_offset)
178 unsigned char digest[ISIS_AUTH_MD5_SIZE];
180 /* Auth fail () - passwd type mismatch */
181 if (local->type != remote->type)
186 /* No authentication required */
187 case ISIS_PASSWD_TYPE_UNUSED:
190 /* Cleartext (ISO 10589) */
191 case ISIS_PASSWD_TYPE_CLEARTXT:
192 /* Auth fail () - passwd len mismatch */
193 if (remote->len != local->len)
195 return memcmp (local->passwd, remote->passwd, local->len);
197 /* HMAC MD5 (RFC 3567) */
198 case ISIS_PASSWD_TYPE_HMAC_MD5:
199 /* Auth fail () - passwd len mismatch */
200 if (remote->len != ISIS_AUTH_MD5_SIZE)
202 /* Set the authentication value to 0 before the check */
203 memset (STREAM_DATA (stream) + auth_tlv_offset + 3, 0,
205 /* Compute the digest */
206 hmac_md5 (STREAM_DATA (stream), stream_get_endp (stream),
207 (unsigned char *) &(local->passwd), local->len,
208 (unsigned char *) &digest);
209 /* Copy back the authentication value after the check */
210 memcpy (STREAM_DATA (stream) + auth_tlv_offset + 3,
211 remote->passwd, ISIS_AUTH_MD5_SIZE);
212 return memcmp (digest, remote->passwd, ISIS_AUTH_MD5_SIZE);
215 zlog_err ("Unsupported authentication type");
219 /* Authentication pass when no authentication is configured */
224 lsp_authentication_check (struct stream *stream, struct isis_area *area,
225 int level, struct isis_passwd *passwd)
227 struct isis_link_state_hdr *hdr;
228 uint32_t expected = 0, found = 0, auth_tlv_offset = 0;
229 uint16_t checksum, rem_lifetime, pdu_len;
231 int retval = ISIS_OK;
233 hdr = (struct isis_link_state_hdr *) (STREAM_PNT (stream));
234 pdu_len = ntohs (hdr->pdu_len);
235 expected |= TLVFLAG_AUTH_INFO;
236 auth_tlv_offset = stream_get_getp (stream) + ISIS_LSP_HDR_LEN;
237 retval = parse_tlvs (area->area_tag, STREAM_PNT (stream) + ISIS_LSP_HDR_LEN,
238 pdu_len - ISIS_FIXED_HDR_LEN - ISIS_LSP_HDR_LEN,
239 &expected, &found, &tlvs, &auth_tlv_offset);
241 if (retval != ISIS_OK)
243 zlog_err ("ISIS-Upd (%s): Parse failed L%d LSP %s, seq 0x%08x, "
244 "cksum 0x%04x, lifetime %us, len %u",
245 area->area_tag, level, rawlspid_print (hdr->lsp_id),
246 ntohl (hdr->seq_num), ntohs (hdr->checksum),
247 ntohs (hdr->rem_lifetime), pdu_len);
248 if ((isis->debugs & DEBUG_UPDATE_PACKETS) &&
249 (isis->debugs & DEBUG_PACKET_DUMP))
250 zlog_dump_data (STREAM_DATA (stream), stream_get_endp (stream));
254 if (!(found & TLVFLAG_AUTH_INFO))
256 zlog_err ("No authentication tlv in LSP");
260 if (tlvs.auth_info.type != ISIS_PASSWD_TYPE_CLEARTXT &&
261 tlvs.auth_info.type != ISIS_PASSWD_TYPE_HMAC_MD5)
263 zlog_err ("Unknown authentication type in LSP");
268 * RFC 5304 set checksum and remaining lifetime to zero before
269 * verification and reset to old values after verification.
271 checksum = hdr->checksum;
272 rem_lifetime = hdr->rem_lifetime;
274 hdr->rem_lifetime = 0;
275 retval = authentication_check (&tlvs.auth_info, passwd, stream,
277 hdr->checksum = checksum;
278 hdr->rem_lifetime = rem_lifetime;
284 * Processing helper functions
289 XFREE (MTYPE_ISIS_TMP, val);
293 tlvs_to_adj_area_addrs (struct tlvs *tlvs, struct isis_adjacency *adj)
295 struct listnode *node;
296 struct area_addr *area_addr, *malloced;
300 adj->area_addrs->del = del_addr;
301 list_delete (adj->area_addrs);
303 adj->area_addrs = list_new ();
304 if (tlvs->area_addrs)
306 for (ALL_LIST_ELEMENTS_RO (tlvs->area_addrs, node, area_addr))
308 malloced = XMALLOC (MTYPE_ISIS_TMP, sizeof (struct area_addr));
309 memcpy (malloced, area_addr, sizeof (struct area_addr));
310 listnode_add (adj->area_addrs, malloced);
316 tlvs_to_adj_nlpids (struct tlvs *tlvs, struct isis_adjacency *adj)
319 struct nlpids *tlv_nlpids;
324 tlv_nlpids = tlvs->nlpids;
325 if (tlv_nlpids->count > array_size (adj->nlpids.nlpids))
328 adj->nlpids.count = tlv_nlpids->count;
330 for (i = 0; i < tlv_nlpids->count; i++)
332 adj->nlpids.nlpids[i] = tlv_nlpids->nlpids[i];
339 tlvs_to_adj_ipv4_addrs (struct tlvs *tlvs, struct isis_adjacency *adj)
341 struct listnode *node;
342 struct in_addr *ipv4_addr, *malloced;
346 adj->ipv4_addrs->del = del_addr;
347 list_delete (adj->ipv4_addrs);
349 adj->ipv4_addrs = list_new ();
350 if (tlvs->ipv4_addrs)
352 for (ALL_LIST_ELEMENTS_RO (tlvs->ipv4_addrs, node, ipv4_addr))
354 malloced = XMALLOC (MTYPE_ISIS_TMP, sizeof (struct in_addr));
355 memcpy (malloced, ipv4_addr, sizeof (struct in_addr));
356 listnode_add (adj->ipv4_addrs, malloced);
363 tlvs_to_adj_ipv6_addrs (struct tlvs *tlvs, struct isis_adjacency *adj)
365 struct listnode *node;
366 struct in6_addr *ipv6_addr, *malloced;
370 adj->ipv6_addrs->del = del_addr;
371 list_delete (adj->ipv6_addrs);
373 adj->ipv6_addrs = list_new ();
374 if (tlvs->ipv6_addrs)
376 for (ALL_LIST_ELEMENTS_RO (tlvs->ipv6_addrs, node, ipv6_addr))
378 malloced = XMALLOC (MTYPE_ISIS_TMP, sizeof (struct in6_addr));
379 memcpy (malloced, ipv6_addr, sizeof (struct in6_addr));
380 listnode_add (adj->ipv6_addrs, malloced);
385 #endif /* HAVE_IPV6 */
394 * Section 8.2.5 - Receiving point-to-point IIH PDUs
398 process_p2p_hello (struct isis_circuit *circuit)
400 int retval = ISIS_OK;
401 struct isis_p2p_hello_hdr *hdr;
402 struct isis_adjacency *adj;
403 u_int32_t expected = 0, found = 0, auth_tlv_offset = 0;
406 int v4_usable = 0, v6_usable = 0;
408 if (isis->debugs & DEBUG_ADJ_PACKETS)
410 zlog_debug ("ISIS-Adj (%s): Rcvd P2P IIH on %s, cirType %s, cirID %u",
411 circuit->area->area_tag, circuit->interface->name,
412 circuit_t2string (circuit->is_type), circuit->circuit_id);
413 if (isis->debugs & DEBUG_PACKET_DUMP)
414 zlog_dump_data (STREAM_DATA (circuit->rcv_stream),
415 stream_get_endp (circuit->rcv_stream));
418 if (circuit->circ_type != CIRCUIT_T_P2P)
420 zlog_warn ("p2p hello on non p2p circuit");
424 if ((stream_get_endp (circuit->rcv_stream) -
425 stream_get_getp (circuit->rcv_stream)) < ISIS_P2PHELLO_HDRLEN)
427 zlog_warn ("Packet too short");
431 /* 8.2.5.1 PDU acceptance tests */
433 /* 8.2.5.1 a) external domain untrue */
434 /* FIXME: not useful at all? */
436 /* 8.2.5.1 b) ID Length mismatch */
437 /* checked at the handle_pdu */
439 /* 8.2.5.2 IIH PDU Processing */
441 /* 8.2.5.2 a) 1) Maximum Area Addresses */
442 /* Already checked, and can also be ommited */
447 hdr = (struct isis_p2p_hello_hdr *) STREAM_PNT (circuit->rcv_stream);
448 pdu_len = ntohs (hdr->pdu_len);
450 if (pdu_len < (ISIS_FIXED_HDR_LEN + ISIS_P2PHELLO_HDRLEN) ||
451 pdu_len > ISO_MTU(circuit) ||
452 pdu_len > stream_get_endp (circuit->rcv_stream))
454 zlog_warn ("ISIS-Adj (%s): Rcvd P2P IIH from (%s) with "
455 "invalid pdu length %d",
456 circuit->area->area_tag, circuit->interface->name, pdu_len);
461 * Set the stream endp to PDU length, ignoring additional padding
462 * introduced by transport chips.
464 if (pdu_len < stream_get_endp (circuit->rcv_stream))
465 stream_set_endp (circuit->rcv_stream, pdu_len);
467 stream_forward_getp (circuit->rcv_stream, ISIS_P2PHELLO_HDRLEN);
470 * Lets get the TLVS now
472 expected |= TLVFLAG_AREA_ADDRS;
473 expected |= TLVFLAG_AUTH_INFO;
474 expected |= TLVFLAG_NLPID;
475 expected |= TLVFLAG_IPV4_ADDR;
476 expected |= TLVFLAG_IPV6_ADDR;
478 auth_tlv_offset = stream_get_getp (circuit->rcv_stream);
479 retval = parse_tlvs (circuit->area->area_tag,
480 STREAM_PNT (circuit->rcv_stream),
481 pdu_len - ISIS_P2PHELLO_HDRLEN - ISIS_FIXED_HDR_LEN,
482 &expected, &found, &tlvs, &auth_tlv_offset);
484 if (retval > ISIS_WARNING)
486 zlog_warn ("parse_tlvs() failed");
491 if (!(found & TLVFLAG_AREA_ADDRS))
493 zlog_warn ("No Area addresses TLV in P2P IS to IS hello");
498 if (!(found & TLVFLAG_NLPID))
500 zlog_warn ("No supported protocols TLV in P2P IS to IS hello");
505 /* 8.2.5.1 c) Authentication */
506 if (circuit->passwd.type)
508 if (!(found & TLVFLAG_AUTH_INFO) ||
509 authentication_check (&tlvs.auth_info, &circuit->passwd,
510 circuit->rcv_stream, auth_tlv_offset))
512 isis_event_auth_failure (circuit->area->area_tag,
513 "P2P hello authentication failure",
521 * check if it's own interface ip match iih ip addrs
523 if (found & TLVFLAG_IPV4_ADDR)
525 if (ip_match (circuit->ip_addrs, tlvs.ipv4_addrs))
528 zlog_warn ("ISIS-Adj: IPv4 addresses present but no overlap "
529 "in P2P IIH from %s\n", circuit->interface->name);
532 else /* !(found & TLVFLAG_IPV4_ADDR) */
533 zlog_warn ("ISIS-Adj: no IPv4 in P2P IIH from %s "
534 "(this isisd has no IPv6)\n", circuit->interface->name);
537 if (found & TLVFLAG_IPV6_ADDR)
539 /* TBA: check that we have a linklocal ourselves? */
540 struct listnode *node;
542 for (ALL_LIST_ELEMENTS_RO (tlvs.ipv6_addrs, node, ip))
543 if (IN6_IS_ADDR_LINKLOCAL (ip))
550 zlog_warn ("ISIS-Adj: IPv6 addresses present but no link-local "
551 "in P2P IIH from %s\n", circuit->interface->name);
554 if (!(found & (TLVFLAG_IPV4_ADDR | TLVFLAG_IPV6_ADDR)))
555 zlog_warn ("ISIS-Adj: neither IPv4 nor IPv6 addr in P2P IIH from %s\n",
556 circuit->interface->name);
559 if (!v6_usable && !v4_usable)
566 * it's own p2p IIH PDU - discard
568 if (!memcmp (hdr->source_id, isis->sysid, ISIS_SYS_ID_LEN))
570 zlog_warn ("ISIS-Adj (%s): it's own IIH PDU - discarded",
571 circuit->area->area_tag);
577 * My interpertation of the ISO, if no adj exists we will create one for
580 adj = circuit->u.p2p.neighbor;
581 /* If an adjacency exists, check it is with the source of the hello
585 if (memcmp(hdr->source_id, adj->sysid, ISIS_SYS_ID_LEN))
587 zlog_debug("hello source and adjacency do not match, set adj down\n");
588 isis_adj_state_change (adj, ISIS_ADJ_DOWN, "adj do not exist");
592 if (!adj || adj->level != hdr->circuit_t)
596 adj = isis_new_adj (hdr->source_id, NULL, hdr->circuit_t, circuit);
602 adj->level = hdr->circuit_t;
604 circuit->u.p2p.neighbor = adj;
605 /* Build lsp with the new neighbor entry when a new
606 * adjacency is formed. Set adjacency circuit type to
607 * IIH PDU header circuit type before lsp is regenerated
608 * when an adjacency is up. This will result in the new
609 * adjacency entry getting added to the lsp tlv neighbor list.
611 adj->circuit_t = hdr->circuit_t;
612 isis_adj_state_change (adj, ISIS_ADJ_INITIALIZING, NULL);
613 adj->sys_type = ISIS_SYSTYPE_UNKNOWN;
616 /* 8.2.6 Monitoring point-to-point adjacencies */
617 adj->hold_time = ntohs (hdr->hold_time);
618 adj->last_upd = time (NULL);
620 /* we do this now because the adj may not survive till the end... */
621 tlvs_to_adj_area_addrs (&tlvs, adj);
623 /* which protocol are spoken ??? */
624 if (tlvs_to_adj_nlpids (&tlvs, adj))
630 /* we need to copy addresses to the adj */
631 if (found & TLVFLAG_IPV4_ADDR)
632 tlvs_to_adj_ipv4_addrs (&tlvs, adj);
634 /* Update MPLS TE Remote IP address parameter if possible */
635 if (IS_MPLS_TE(isisMplsTE) && circuit->mtc && IS_CIRCUIT_TE(circuit->mtc))
636 if (adj->ipv4_addrs != NULL && listcount(adj->ipv4_addrs) != 0)
638 struct in_addr *ip_addr;
639 ip_addr = (struct in_addr *)listgetdata ((struct listnode *)listhead (adj->ipv4_addrs));
640 set_circuitparams_rmt_ipaddr (circuit->mtc, *ip_addr);
644 if (found & TLVFLAG_IPV6_ADDR)
645 tlvs_to_adj_ipv6_addrs (&tlvs, adj);
646 #endif /* HAVE_IPV6 */
648 /* lets take care of the expiry */
649 THREAD_TIMER_OFF (adj->t_expire);
650 THREAD_TIMER_ON (master, adj->t_expire, isis_adj_expire, adj,
651 (long) adj->hold_time);
653 /* 8.2.5.2 a) a match was detected */
654 if (area_match (circuit->area->area_addrs, tlvs.area_addrs))
656 /* 8.2.5.2 a) 2) If the system is L1 - table 5 */
657 if (circuit->area->is_type == IS_LEVEL_1)
659 switch (hdr->circuit_t)
662 case IS_LEVEL_1_AND_2:
663 if (adj->adj_state != ISIS_ADJ_UP)
665 /* (4) adj state up */
666 isis_adj_state_change (adj, ISIS_ADJ_UP, NULL);
667 /* (5) adj usage level 1 */
668 adj->adj_usage = ISIS_ADJ_LEVEL1;
670 else if (adj->adj_usage == ISIS_ADJ_LEVEL1)
676 if (adj->adj_state != ISIS_ADJ_UP)
678 /* (7) reject - wrong system type event */
679 zlog_warn ("wrongSystemType");
681 return ISIS_WARNING; /* Reject */
683 else if (adj->adj_usage == ISIS_ADJ_LEVEL1)
685 /* (6) down - wrong system */
686 isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Wrong System");
692 /* 8.2.5.2 a) 3) If the system is L1L2 - table 6 */
693 if (circuit->area->is_type == IS_LEVEL_1_AND_2)
695 switch (hdr->circuit_t)
698 if (adj->adj_state != ISIS_ADJ_UP)
700 /* (6) adj state up */
701 isis_adj_state_change (adj, ISIS_ADJ_UP, NULL);
702 /* (7) adj usage level 1 */
703 adj->adj_usage = ISIS_ADJ_LEVEL1;
705 else if (adj->adj_usage == ISIS_ADJ_LEVEL1)
709 else if ((adj->adj_usage == ISIS_ADJ_LEVEL1AND2) ||
710 (adj->adj_usage == ISIS_ADJ_LEVEL2))
712 /* (8) down - wrong system */
713 isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Wrong System");
717 if (adj->adj_state != ISIS_ADJ_UP)
719 /* (6) adj state up */
720 isis_adj_state_change (adj, ISIS_ADJ_UP, NULL);
721 /* (9) adj usage level 2 */
722 adj->adj_usage = ISIS_ADJ_LEVEL2;
724 else if ((adj->adj_usage == ISIS_ADJ_LEVEL1) ||
725 (adj->adj_usage == ISIS_ADJ_LEVEL1AND2))
727 /* (8) down - wrong system */
728 isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Wrong System");
730 else if (adj->adj_usage == ISIS_ADJ_LEVEL2)
735 case IS_LEVEL_1_AND_2:
736 if (adj->adj_state != ISIS_ADJ_UP)
738 /* (6) adj state up */
739 isis_adj_state_change (adj, ISIS_ADJ_UP, NULL);
740 /* (10) adj usage level 1 */
741 adj->adj_usage = ISIS_ADJ_LEVEL1AND2;
743 else if ((adj->adj_usage == ISIS_ADJ_LEVEL1) ||
744 (adj->adj_usage == ISIS_ADJ_LEVEL2))
746 /* (8) down - wrong system */
747 isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Wrong System");
749 else if (adj->adj_usage == ISIS_ADJ_LEVEL1AND2)
757 /* 8.2.5.2 a) 4) If the system is L2 - table 7 */
758 if (circuit->area->is_type == IS_LEVEL_2)
760 switch (hdr->circuit_t)
763 if (adj->adj_state != ISIS_ADJ_UP)
765 /* (5) reject - wrong system type event */
766 zlog_warn ("wrongSystemType");
768 return ISIS_WARNING; /* Reject */
770 else if ((adj->adj_usage == ISIS_ADJ_LEVEL1AND2) ||
771 (adj->adj_usage == ISIS_ADJ_LEVEL2))
773 /* (6) down - wrong system */
774 isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Wrong System");
777 case IS_LEVEL_1_AND_2:
779 if (adj->adj_state != ISIS_ADJ_UP)
781 /* (7) adj state up */
782 isis_adj_state_change (adj, ISIS_ADJ_UP, NULL);
783 /* (8) adj usage level 2 */
784 adj->adj_usage = ISIS_ADJ_LEVEL2;
786 else if (adj->adj_usage == ISIS_ADJ_LEVEL1AND2)
788 /* (6) down - wrong system */
789 isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Wrong System");
791 else if (adj->adj_usage == ISIS_ADJ_LEVEL2)
799 /* 8.2.5.2 b) if no match was detected */
800 else if (listcount (circuit->area->area_addrs) > 0)
802 if (circuit->area->is_type == IS_LEVEL_1)
804 /* 8.2.5.2 b) 1) is_type L1 and adj is not up */
805 if (adj->adj_state != ISIS_ADJ_UP)
807 isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Area Mismatch");
808 /* 8.2.5.2 b) 2)is_type L1 and adj is up */
812 isis_adj_state_change (adj, ISIS_ADJ_DOWN,
813 "Down - Area Mismatch");
816 /* 8.2.5.2 b 3 If the system is L2 or L1L2 - table 8 */
819 switch (hdr->circuit_t)
822 if (adj->adj_state != ISIS_ADJ_UP)
824 /* (6) reject - Area Mismatch event */
825 zlog_warn ("AreaMismatch");
827 return ISIS_WARNING; /* Reject */
829 else if (adj->adj_usage == ISIS_ADJ_LEVEL1)
831 /* (7) down - area mismatch */
832 isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Area Mismatch");
835 else if ((adj->adj_usage == ISIS_ADJ_LEVEL1AND2) ||
836 (adj->adj_usage == ISIS_ADJ_LEVEL2))
838 /* (7) down - wrong system */
839 isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Wrong System");
842 case IS_LEVEL_1_AND_2:
844 if (adj->adj_state != ISIS_ADJ_UP)
846 /* (8) adj state up */
847 isis_adj_state_change (adj, ISIS_ADJ_UP, NULL);
848 /* (9) adj usage level 2 */
849 adj->adj_usage = ISIS_ADJ_LEVEL2;
851 else if (adj->adj_usage == ISIS_ADJ_LEVEL1)
853 /* (7) down - wrong system */
854 isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Wrong System");
856 else if (adj->adj_usage == ISIS_ADJ_LEVEL1AND2)
858 if (hdr->circuit_t == IS_LEVEL_2)
860 /* (7) down - wrong system */
861 isis_adj_state_change (adj, ISIS_ADJ_DOWN,
866 /* (7) down - area mismatch */
867 isis_adj_state_change (adj, ISIS_ADJ_DOWN,
871 else if (adj->adj_usage == ISIS_ADJ_LEVEL2)
881 /* down - area mismatch */
882 isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Area Mismatch");
884 /* 8.2.5.2 c) if the action was up - comparing circuit IDs */
885 /* FIXME - Missing parts */
887 /* some of my own understanding of the ISO, why the heck does
888 * it not say what should I change the system_type to...
890 switch (adj->adj_usage)
892 case ISIS_ADJ_LEVEL1:
893 adj->sys_type = ISIS_SYSTYPE_L1_IS;
895 case ISIS_ADJ_LEVEL2:
896 adj->sys_type = ISIS_SYSTYPE_L2_IS;
898 case ISIS_ADJ_LEVEL1AND2:
899 adj->sys_type = ISIS_SYSTYPE_L2_IS;
902 adj->sys_type = ISIS_SYSTYPE_UNKNOWN;
907 if (isis->debugs & DEBUG_ADJ_PACKETS)
909 zlog_debug ("ISIS-Adj (%s): Rcvd P2P IIH from (%s), cir type %s,"
910 " cir id %02d, length %d",
911 circuit->area->area_tag, circuit->interface->name,
912 circuit_t2string (circuit->is_type),
913 circuit->circuit_id, pdu_len);
922 * Process IS-IS LAN Level 1/2 Hello PDU
925 process_lan_hello (int level, struct isis_circuit *circuit, const u_char *ssnpa)
927 int retval = ISIS_OK;
928 struct isis_lan_hello_hdr hdr;
929 struct isis_adjacency *adj;
930 u_int32_t expected = 0, found = 0, auth_tlv_offset = 0;
933 struct listnode *node;
934 int v4_usable = 0, v6_usable = 0;
936 if (isis->debugs & DEBUG_ADJ_PACKETS)
938 zlog_debug ("ISIS-Adj (%s): Rcvd L%d LAN IIH on %s, cirType %s, "
940 circuit->area->area_tag, level, circuit->interface->name,
941 circuit_t2string (circuit->is_type), circuit->circuit_id);
942 if (isis->debugs & DEBUG_PACKET_DUMP)
943 zlog_dump_data (STREAM_DATA (circuit->rcv_stream),
944 stream_get_endp (circuit->rcv_stream));
947 if (circuit->circ_type != CIRCUIT_T_BROADCAST)
949 zlog_warn ("lan hello on non broadcast circuit");
953 if ((stream_get_endp (circuit->rcv_stream) -
954 stream_get_getp (circuit->rcv_stream)) < ISIS_LANHELLO_HDRLEN)
956 zlog_warn ("Packet too short");
960 if (circuit->ext_domain)
962 zlog_debug ("level %d LAN Hello received over circuit with "
963 "externalDomain = true", level);
967 if (!accept_level (level, circuit->is_type))
969 if (isis->debugs & DEBUG_ADJ_PACKETS)
971 zlog_debug ("ISIS-Adj (%s): Interface level mismatch, %s",
972 circuit->area->area_tag, circuit->interface->name);
978 /* Cisco's debug message compatability */
979 if (!accept_level (level, circuit->area->is_type))
981 if (isis->debugs & DEBUG_ADJ_PACKETS)
983 zlog_debug ("ISIS-Adj (%s): is type mismatch",
984 circuit->area->area_tag);
992 hdr.circuit_t = stream_getc (circuit->rcv_stream);
993 stream_get (hdr.source_id, circuit->rcv_stream, ISIS_SYS_ID_LEN);
994 hdr.hold_time = stream_getw (circuit->rcv_stream);
995 hdr.pdu_len = stream_getw (circuit->rcv_stream);
996 hdr.prio = stream_getc (circuit->rcv_stream);
997 stream_get (hdr.lan_id, circuit->rcv_stream, ISIS_SYS_ID_LEN + 1);
999 if (hdr.pdu_len < (ISIS_FIXED_HDR_LEN + ISIS_LANHELLO_HDRLEN) ||
1000 hdr.pdu_len > ISO_MTU(circuit) ||
1001 hdr.pdu_len > stream_get_endp (circuit->rcv_stream))
1003 zlog_warn ("ISIS-Adj (%s): Rcvd LAN IIH from (%s) with "
1004 "invalid pdu length %d",
1005 circuit->area->area_tag, circuit->interface->name,
1007 return ISIS_WARNING;
1011 * Set the stream endp to PDU length, ignoring additional padding
1012 * introduced by transport chips.
1014 if (hdr.pdu_len < stream_get_endp (circuit->rcv_stream))
1015 stream_set_endp (circuit->rcv_stream, hdr.pdu_len);
1017 if (hdr.circuit_t != IS_LEVEL_1 &&
1018 hdr.circuit_t != IS_LEVEL_2 &&
1019 hdr.circuit_t != IS_LEVEL_1_AND_2 &&
1020 (level & hdr.circuit_t) == 0)
1022 zlog_err ("Level %d LAN Hello with Circuit Type %d", level,
1030 expected |= TLVFLAG_AUTH_INFO;
1031 expected |= TLVFLAG_AREA_ADDRS;
1032 expected |= TLVFLAG_LAN_NEIGHS;
1033 expected |= TLVFLAG_NLPID;
1034 expected |= TLVFLAG_IPV4_ADDR;
1035 expected |= TLVFLAG_IPV6_ADDR;
1037 auth_tlv_offset = stream_get_getp (circuit->rcv_stream);
1038 retval = parse_tlvs (circuit->area->area_tag,
1039 STREAM_PNT (circuit->rcv_stream),
1040 hdr.pdu_len - ISIS_LANHELLO_HDRLEN - ISIS_FIXED_HDR_LEN,
1041 &expected, &found, &tlvs,
1044 if (retval > ISIS_WARNING)
1046 zlog_warn ("parse_tlvs() failed");
1050 if (!(found & TLVFLAG_AREA_ADDRS))
1052 zlog_warn ("No Area addresses TLV in Level %d LAN IS to IS hello",
1054 retval = ISIS_WARNING;
1058 if (!(found & TLVFLAG_NLPID))
1060 zlog_warn ("No supported protocols TLV in Level %d LAN IS to IS hello",
1062 retval = ISIS_WARNING;
1066 /* Verify authentication, either cleartext of HMAC MD5 */
1067 if (circuit->passwd.type)
1069 if (!(found & TLVFLAG_AUTH_INFO) ||
1070 authentication_check (&tlvs.auth_info, &circuit->passwd,
1071 circuit->rcv_stream, auth_tlv_offset))
1073 isis_event_auth_failure (circuit->area->area_tag,
1074 "LAN hello authentication failure",
1076 retval = ISIS_WARNING;
1081 if (!memcmp (hdr.source_id, isis->sysid, ISIS_SYS_ID_LEN))
1083 zlog_warn ("ISIS-Adj (%s): duplicate system ID on interface %s",
1084 circuit->area->area_tag, circuit->interface->name);
1085 return ISIS_WARNING;
1089 * Accept the level 1 adjacency only if a match between local and
1090 * remote area addresses is found
1092 if (listcount (circuit->area->area_addrs) == 0 ||
1093 (level == IS_LEVEL_1 &&
1094 area_match (circuit->area->area_addrs, tlvs.area_addrs) == 0))
1096 if (isis->debugs & DEBUG_ADJ_PACKETS)
1098 zlog_debug ("ISIS-Adj (%s): Area mismatch, level %d IIH on %s",
1099 circuit->area->area_tag, level,
1100 circuit->interface->name);
1107 * it's own IIH PDU - discard silently
1109 if (!memcmp (circuit->u.bc.snpa, ssnpa, ETH_ALEN))
1111 zlog_debug ("ISIS-Adj (%s): it's own IIH PDU - discarded",
1112 circuit->area->area_tag);
1119 * check if it's own interface ip match iih ip addrs
1121 if (found & TLVFLAG_IPV4_ADDR)
1123 if (ip_match (circuit->ip_addrs, tlvs.ipv4_addrs))
1126 zlog_warn ("ISIS-Adj: IPv4 addresses present but no overlap "
1127 "in LAN IIH from %s\n", circuit->interface->name);
1130 else /* !(found & TLVFLAG_IPV4_ADDR) */
1131 zlog_warn ("ISIS-Adj: no IPv4 in LAN IIH from %s "
1132 "(this isisd has no IPv6)\n", circuit->interface->name);
1135 if (found & TLVFLAG_IPV6_ADDR)
1137 /* TBA: check that we have a linklocal ourselves? */
1138 struct listnode *node;
1139 struct in6_addr *ip;
1140 for (ALL_LIST_ELEMENTS_RO (tlvs.ipv6_addrs, node, ip))
1141 if (IN6_IS_ADDR_LINKLOCAL (ip))
1148 zlog_warn ("ISIS-Adj: IPv6 addresses present but no link-local "
1149 "in LAN IIH from %s\n", circuit->interface->name);
1152 if (!(found & (TLVFLAG_IPV4_ADDR | TLVFLAG_IPV6_ADDR)))
1153 zlog_warn ("ISIS-Adj: neither IPv4 nor IPv6 addr in LAN IIH from %s\n",
1154 circuit->interface->name);
1157 if (!v6_usable && !v4_usable)
1160 return ISIS_WARNING;
1164 adj = isis_adj_lookup (hdr.source_id, circuit->u.bc.adjdb[level - 1]);
1165 if ((adj == NULL) || (memcmp(adj->snpa, ssnpa, ETH_ALEN)) ||
1166 (adj->level != level))
1173 adj = isis_new_adj (hdr.source_id, ssnpa, level, circuit);
1176 retval = ISIS_ERROR;
1183 memcpy (adj->snpa, ssnpa, 6);
1185 memset (adj->snpa, ' ', 6);
1189 isis_adj_state_change (adj, ISIS_ADJ_INITIALIZING, NULL);
1191 if (level == IS_LEVEL_1)
1192 adj->sys_type = ISIS_SYSTYPE_L1_IS;
1194 adj->sys_type = ISIS_SYSTYPE_L2_IS;
1195 list_delete_all_node (circuit->u.bc.lan_neighs[level - 1]);
1196 isis_adj_build_neigh_list (circuit->u.bc.adjdb[level - 1],
1197 circuit->u.bc.lan_neighs[level - 1]);
1200 if(adj->dis_record[level-1].dis==ISIS_IS_DIS)
1204 if (memcmp (circuit->u.bc.l1_desig_is, hdr.lan_id, ISIS_SYS_ID_LEN + 1))
1206 thread_add_event (master, isis_event_dis_status_change, circuit, 0);
1207 memcpy (&circuit->u.bc.l1_desig_is, hdr.lan_id,
1208 ISIS_SYS_ID_LEN + 1);
1212 if (memcmp (circuit->u.bc.l2_desig_is, hdr.lan_id, ISIS_SYS_ID_LEN + 1))
1214 thread_add_event (master, isis_event_dis_status_change, circuit, 0);
1215 memcpy (&circuit->u.bc.l2_desig_is, hdr.lan_id,
1216 ISIS_SYS_ID_LEN + 1);
1221 adj->hold_time = hdr.hold_time;
1222 adj->last_upd = time (NULL);
1223 adj->prio[level - 1] = hdr.prio;
1225 memcpy (adj->lanid, hdr.lan_id, ISIS_SYS_ID_LEN + 1);
1227 tlvs_to_adj_area_addrs (&tlvs, adj);
1229 /* which protocol are spoken ??? */
1230 if (tlvs_to_adj_nlpids (&tlvs, adj))
1232 retval = ISIS_WARNING;
1236 /* we need to copy addresses to the adj */
1237 if (found & TLVFLAG_IPV4_ADDR)
1238 tlvs_to_adj_ipv4_addrs (&tlvs, adj);
1241 if (found & TLVFLAG_IPV6_ADDR)
1242 tlvs_to_adj_ipv6_addrs (&tlvs, adj);
1243 #endif /* HAVE_IPV6 */
1245 adj->circuit_t = hdr.circuit_t;
1247 /* lets take care of the expiry */
1248 THREAD_TIMER_OFF (adj->t_expire);
1249 THREAD_TIMER_ON (master, adj->t_expire, isis_adj_expire, adj,
1250 (long) adj->hold_time);
1253 * If the snpa for this circuit is found from LAN Neighbours TLV
1254 * we have two-way communication -> adjacency can be put to state "up"
1257 if (found & TLVFLAG_LAN_NEIGHS)
1259 if (adj->adj_state != ISIS_ADJ_UP)
1261 for (ALL_LIST_ELEMENTS_RO (tlvs.lan_neighs, node, snpa))
1263 if (!memcmp (snpa, circuit->u.bc.snpa, ETH_ALEN))
1265 isis_adj_state_change (adj, ISIS_ADJ_UP,
1266 "own SNPA found in LAN Neighbours TLV");
1273 for (ALL_LIST_ELEMENTS_RO (tlvs.lan_neighs, node, snpa))
1274 if (!memcmp (snpa, circuit->u.bc.snpa, ETH_ALEN))
1280 isis_adj_state_change (adj, ISIS_ADJ_INITIALIZING,
1281 "own SNPA not found in LAN Neighbours TLV");
1284 else if (adj->adj_state == ISIS_ADJ_UP)
1286 isis_adj_state_change (adj, ISIS_ADJ_INITIALIZING,
1287 "no LAN Neighbours TLV found");
1291 if (isis->debugs & DEBUG_ADJ_PACKETS)
1293 zlog_debug ("ISIS-Adj (%s): Rcvd L%d LAN IIH from %s on %s, cirType %s, "
1294 "cirID %u, length %zd",
1295 circuit->area->area_tag,
1296 level, snpa_print (ssnpa), circuit->interface->name,
1297 circuit_t2string (circuit->is_type),
1298 circuit->circuit_id,
1299 stream_get_endp (circuit->rcv_stream));
1308 * Process Level 1/2 Link State
1310 * Section 7.3.15.1 - Action on receipt of a link state PDU
1313 process_lsp (int level, struct isis_circuit *circuit, const u_char *ssnpa)
1315 struct isis_link_state_hdr *hdr;
1316 struct isis_adjacency *adj = NULL;
1317 struct isis_lsp *lsp, *lsp0 = NULL;
1318 int retval = ISIS_OK, comp = 0;
1319 u_char lspid[ISIS_SYS_ID_LEN + 2];
1320 struct isis_passwd *passwd;
1324 if (isis->debugs & DEBUG_UPDATE_PACKETS)
1326 zlog_debug ("ISIS-Upd (%s): Rcvd L%d LSP on %s, cirType %s, cirID %u",
1327 circuit->area->area_tag, level, circuit->interface->name,
1328 circuit_t2string (circuit->is_type), circuit->circuit_id);
1329 if (isis->debugs & DEBUG_PACKET_DUMP)
1330 zlog_dump_data (STREAM_DATA (circuit->rcv_stream),
1331 stream_get_endp (circuit->rcv_stream));
1334 if ((stream_get_endp (circuit->rcv_stream) -
1335 stream_get_getp (circuit->rcv_stream)) < ISIS_LSP_HDR_LEN)
1337 zlog_warn ("Packet too short");
1338 return ISIS_WARNING;
1341 /* Reference the header */
1342 hdr = (struct isis_link_state_hdr *) STREAM_PNT (circuit->rcv_stream);
1343 pdu_len = ntohs (hdr->pdu_len);
1345 /* lsp length check */
1346 if (pdu_len < (ISIS_FIXED_HDR_LEN + ISIS_LSP_HDR_LEN) ||
1347 pdu_len > ISO_MTU(circuit) ||
1348 pdu_len > stream_get_endp (circuit->rcv_stream))
1350 zlog_debug ("ISIS-Upd (%s): LSP %s invalid LSP length %d",
1351 circuit->area->area_tag,
1352 rawlspid_print (hdr->lsp_id), pdu_len);
1354 return ISIS_WARNING;
1358 * Set the stream endp to PDU length, ignoring additional padding
1359 * introduced by transport chips.
1361 if (pdu_len < stream_get_endp (circuit->rcv_stream))
1362 stream_set_endp (circuit->rcv_stream, pdu_len);
1364 if (isis->debugs & DEBUG_UPDATE_PACKETS)
1366 zlog_debug ("ISIS-Upd (%s): Rcvd L%d LSP %s, seq 0x%08x, cksum 0x%04x, "
1367 "lifetime %us, len %u, on %s",
1368 circuit->area->area_tag,
1370 rawlspid_print (hdr->lsp_id),
1371 ntohl (hdr->seq_num),
1372 ntohs (hdr->checksum),
1373 ntohs (hdr->rem_lifetime),
1375 circuit->interface->name);
1378 /* lsp is_type check */
1379 if ((hdr->lsp_bits & IS_LEVEL_1_AND_2) != IS_LEVEL_1 &&
1380 (hdr->lsp_bits & IS_LEVEL_1_AND_2) != IS_LEVEL_1_AND_2)
1382 zlog_debug ("ISIS-Upd (%s): LSP %s invalid LSP is type %x",
1383 circuit->area->area_tag,
1384 rawlspid_print (hdr->lsp_id), hdr->lsp_bits);
1385 /* continue as per RFC1122 Be liberal in what you accept, and
1386 * conservative in what you send */
1389 /* Checksum sanity check - FIXME: move to correct place */
1390 /* 12 = sysid+pdu+remtime */
1391 if (iso_csum_verify (STREAM_PNT (circuit->rcv_stream) + 4,
1392 pdu_len - 12, &hdr->checksum))
1394 zlog_debug ("ISIS-Upd (%s): LSP %s invalid LSP checksum 0x%04x",
1395 circuit->area->area_tag,
1396 rawlspid_print (hdr->lsp_id), ntohs (hdr->checksum));
1398 return ISIS_WARNING;
1401 /* 7.3.15.1 a) 1 - external domain circuit will discard lsps */
1402 if (circuit->ext_domain)
1405 ("ISIS-Upd (%s): LSP %s received at level %d over circuit with "
1406 "externalDomain = true", circuit->area->area_tag,
1407 rawlspid_print (hdr->lsp_id), level);
1409 return ISIS_WARNING;
1412 /* 7.3.15.1 a) 2,3 - manualL2OnlyMode not implemented */
1413 if (!accept_level (level, circuit->is_type))
1415 zlog_debug ("ISIS-Upd (%s): LSP %s received at level %d over circuit of"
1417 circuit->area->area_tag,
1418 rawlspid_print (hdr->lsp_id),
1419 level, circuit_t2string (circuit->is_type));
1421 return ISIS_WARNING;
1424 /* 7.3.15.1 a) 4 - need to make sure IDLength matches */
1426 /* 7.3.15.1 a) 5 - maximum area match, can be ommited since we only use 3 */
1428 /* 7.3.15.1 a) 7 - password check */
1429 (level == IS_LEVEL_1) ? (passwd = &circuit->area->area_passwd) :
1430 (passwd = &circuit->area->domain_passwd);
1433 if (lsp_authentication_check (circuit->rcv_stream, circuit->area,
1436 isis_event_auth_failure (circuit->area->area_tag,
1437 "LSP authentication failure", hdr->lsp_id);
1438 return ISIS_WARNING;
1441 /* Find the LSP in our database and compare it to this Link State header */
1442 lsp = lsp_search (hdr->lsp_id, circuit->area->lspdb[level - 1]);
1444 comp = lsp_compare (circuit->area->area_tag, lsp, hdr->seq_num,
1445 hdr->checksum, hdr->rem_lifetime);
1446 if (lsp && (lsp->own_lsp
1447 #ifdef TOPOLOGY_GENERATE
1448 || lsp->from_topology
1449 #endif /* TOPOLOGY_GENERATE */
1453 /* 7.3.15.1 a) 6 - Must check that we have an adjacency of the same level */
1454 /* for broadcast circuits, snpa should be compared */
1456 if (circuit->circ_type == CIRCUIT_T_BROADCAST)
1458 adj = isis_adj_lookup_snpa (ssnpa, circuit->u.bc.adjdb[level - 1]);
1461 zlog_debug ("(%s): DS ======= LSP %s, seq 0x%08x, cksum 0x%04x, "
1462 "lifetime %us on %s",
1463 circuit->area->area_tag,
1464 rawlspid_print (hdr->lsp_id),
1465 ntohl (hdr->seq_num),
1466 ntohs (hdr->checksum),
1467 ntohs (hdr->rem_lifetime), circuit->interface->name);
1468 return ISIS_WARNING; /* Silently discard */
1471 /* for non broadcast, we just need to find same level adj */
1474 /* If no adj, or no sharing of level */
1475 if (!circuit->u.p2p.neighbor)
1477 return ISIS_OK; /* Silently discard */
1481 if (((level == IS_LEVEL_1) &&
1482 (circuit->u.p2p.neighbor->adj_usage == ISIS_ADJ_LEVEL2)) ||
1483 ((level == IS_LEVEL_2) &&
1484 (circuit->u.p2p.neighbor->adj_usage == ISIS_ADJ_LEVEL1)))
1485 return ISIS_WARNING; /* Silently discard */
1486 adj = circuit->u.p2p.neighbor;
1491 /* 7.3.15.1 a) 7 - Passwords for level 1 - not implemented */
1493 /* 7.3.15.1 a) 8 - Passwords for level 2 - not implemented */
1495 /* 7.3.15.1 a) 9 - OriginatingLSPBufferSize - not implemented FIXME: do it */
1497 /* 7.3.16.2 - If this is an LSP from another IS with identical seq_num but
1498 * wrong checksum, initiate a purge. */
1500 && (lsp->lsp_header->seq_num == hdr->seq_num)
1501 && (lsp->lsp_header->checksum != hdr->checksum))
1503 zlog_warn("ISIS-Upd (%s): LSP %s seq 0x%08x with confused checksum received.",
1504 circuit->area->area_tag, rawlspid_print(hdr->lsp_id),
1505 ntohl(hdr->seq_num));
1506 hdr->rem_lifetime = 0;
1512 /* 7.3.15.1 b) - If the remaining life time is 0, we perform 7.3.16.4 */
1513 if (hdr->rem_lifetime == 0)
1517 /* 7.3.16.4 a) 1) No LSP in db -> send an ack, but don't save */
1518 /* only needed on explicit update, eg - p2p */
1519 if (circuit->circ_type == CIRCUIT_T_P2P)
1520 ack_lsp (hdr, circuit, level);
1521 return retval; /* FIXME: do we need a purge? */
1525 if (memcmp (hdr->lsp_id, isis->sysid, ISIS_SYS_ID_LEN))
1527 /* LSP by some other system -> do 7.3.16.4 b) */
1528 /* 7.3.16.4 b) 1) */
1529 if (comp == LSP_NEWER)
1531 lsp_update (lsp, circuit->rcv_stream, circuit->area, level);
1533 lsp_set_all_srmflags (lsp);
1535 ISIS_FLAGS_CLEAR_ALL (lsp->SSNflags); /* FIXME: OTHER than c */
1537 /* For the case of lsp confusion, flood the purge back to its
1538 * originator so that it can react. Otherwise, don't reflood
1539 * through incoming circuit as usual */
1543 ISIS_CLEAR_FLAG (lsp->SRMflags, circuit);
1545 if (circuit->circ_type != CIRCUIT_T_BROADCAST)
1546 ISIS_SET_FLAG (lsp->SSNflags, circuit);
1548 } /* 7.3.16.4 b) 2) */
1549 else if (comp == LSP_EQUAL)
1552 ISIS_CLEAR_FLAG (lsp->SRMflags, circuit);
1554 if (circuit->circ_type != CIRCUIT_T_BROADCAST)
1555 ISIS_SET_FLAG (lsp->SSNflags, circuit);
1556 } /* 7.3.16.4 b) 3) */
1559 ISIS_SET_FLAG (lsp->SRMflags, circuit);
1560 ISIS_CLEAR_FLAG (lsp->SSNflags, circuit);
1563 else if (lsp->lsp_header->rem_lifetime != 0)
1565 /* our own LSP -> 7.3.16.4 c) */
1566 if (comp == LSP_NEWER)
1568 lsp_inc_seqnum (lsp, ntohl (hdr->seq_num));
1569 lsp_set_all_srmflags (lsp);
1573 ISIS_SET_FLAG (lsp->SRMflags, circuit);
1574 ISIS_CLEAR_FLAG (lsp->SSNflags, circuit);
1576 if (isis->debugs & DEBUG_UPDATE_PACKETS)
1577 zlog_debug ("ISIS-Upd (%s): (1) re-originating LSP %s new "
1578 "seq 0x%08x", circuit->area->area_tag,
1579 rawlspid_print (hdr->lsp_id),
1580 ntohl (lsp->lsp_header->seq_num));
1585 /* 7.3.15.1 c) - If this is our own lsp and we don't have it initiate a
1587 if (memcmp (hdr->lsp_id, isis->sysid, ISIS_SYS_ID_LEN) == 0)
1591 /* 7.3.16.4: initiate a purge */
1592 lsp_purge_non_exist(level, hdr, circuit->area);
1595 /* 7.3.15.1 d) - If this is our own lsp and we have it */
1597 /* In 7.3.16.1, If an Intermediate system R somewhere in the domain
1598 * has information that the current sequence number for source S is
1599 * "greater" than that held by S, ... */
1601 if (ntohl (hdr->seq_num) > ntohl (lsp->lsp_header->seq_num))
1604 lsp_inc_seqnum (lsp, ntohl (hdr->seq_num));
1605 if (isis->debugs & DEBUG_UPDATE_PACKETS)
1606 zlog_debug ("ISIS-Upd (%s): (2) re-originating LSP %s new seq "
1607 "0x%08x", circuit->area->area_tag,
1608 rawlspid_print (hdr->lsp_id),
1609 ntohl (lsp->lsp_header->seq_num));
1611 /* If the received LSP is older or equal,
1612 * resend the LSP which will act as ACK */
1613 lsp_set_all_srmflags (lsp);
1617 /* 7.3.15.1 e) - This lsp originated on another system */
1619 /* 7.3.15.1 e) 1) LSP newer than the one in db or no LSP in db */
1620 if ((!lsp || comp == LSP_NEWER))
1623 * If this lsp is a frag, need to see if we have zero lsp present
1625 if (LSP_FRAGMENT (hdr->lsp_id) != 0)
1627 memcpy (lspid, hdr->lsp_id, ISIS_SYS_ID_LEN + 1);
1628 LSP_FRAGMENT (lspid) = 0;
1629 lsp0 = lsp_search (lspid, circuit->area->lspdb[level - 1]);
1632 zlog_debug ("Got lsp frag, while zero lsp not in database");
1639 lsp = lsp_new_from_stream_ptr (circuit->rcv_stream,
1641 circuit->area, level);
1642 lsp_insert (lsp, circuit->area->lspdb[level - 1]);
1644 else /* exists, so we overwrite */
1646 lsp_update (lsp, circuit->rcv_stream, circuit->area, level);
1649 lsp_set_all_srmflags (lsp);
1651 ISIS_CLEAR_FLAG (lsp->SRMflags, circuit);
1654 if (circuit->circ_type != CIRCUIT_T_BROADCAST)
1655 ISIS_SET_FLAG (lsp->SSNflags, circuit);
1658 /* 7.3.15.1 e) 2) LSP equal to the one in db */
1659 else if (comp == LSP_EQUAL)
1661 ISIS_CLEAR_FLAG (lsp->SRMflags, circuit);
1662 lsp_update (lsp, circuit->rcv_stream, circuit->area, level);
1663 if (circuit->circ_type != CIRCUIT_T_BROADCAST)
1664 ISIS_SET_FLAG (lsp->SSNflags, circuit);
1666 /* 7.3.15.1 e) 3) LSP older than the one in db */
1669 ISIS_SET_FLAG (lsp->SRMflags, circuit);
1670 ISIS_CLEAR_FLAG (lsp->SSNflags, circuit);
1677 * Process Sequence Numbers
1679 * Section 7.3.15.2 - Action on receipt of a sequence numbers PDU
1683 process_snp (int snp_type, int level, struct isis_circuit *circuit,
1684 const u_char *ssnpa)
1686 int retval = ISIS_OK;
1688 char typechar = ' ';
1690 struct isis_adjacency *adj;
1691 struct isis_complete_seqnum_hdr *chdr = NULL;
1692 struct isis_partial_seqnum_hdr *phdr = NULL;
1693 uint32_t found = 0, expected = 0, auth_tlv_offset = 0;
1694 struct isis_lsp *lsp;
1695 struct lsp_entry *entry;
1696 struct listnode *node, *nnode;
1697 struct listnode *node2, *nnode2;
1699 struct list *lsp_list = NULL;
1700 struct isis_passwd *passwd;
1702 if (snp_type == ISIS_SNP_CSNP_FLAG)
1704 /* getting the header info */
1707 (struct isis_complete_seqnum_hdr *) STREAM_PNT (circuit->rcv_stream);
1708 stream_forward_getp (circuit->rcv_stream, ISIS_CSNP_HDRLEN);
1709 pdu_len = ntohs (chdr->pdu_len);
1710 if (pdu_len < (ISIS_FIXED_HDR_LEN + ISIS_CSNP_HDRLEN) ||
1711 pdu_len > ISO_MTU(circuit) ||
1712 pdu_len > stream_get_endp (circuit->rcv_stream))
1714 zlog_warn ("Received a CSNP with bogus length %d", pdu_len);
1715 return ISIS_WARNING;
1722 (struct isis_partial_seqnum_hdr *) STREAM_PNT (circuit->rcv_stream);
1723 stream_forward_getp (circuit->rcv_stream, ISIS_PSNP_HDRLEN);
1724 pdu_len = ntohs (phdr->pdu_len);
1725 if (pdu_len < (ISIS_FIXED_HDR_LEN + ISIS_PSNP_HDRLEN) ||
1726 pdu_len > ISO_MTU(circuit) ||
1727 pdu_len > stream_get_endp (circuit->rcv_stream))
1729 zlog_warn ("Received a PSNP with bogus length %d", pdu_len);
1730 return ISIS_WARNING;
1735 * Set the stream endp to PDU length, ignoring additional padding
1736 * introduced by transport chips.
1738 if (pdu_len < stream_get_endp (circuit->rcv_stream))
1739 stream_set_endp (circuit->rcv_stream, pdu_len);
1741 /* 7.3.15.2 a) 1 - external domain circuit will discard snp pdu */
1742 if (circuit->ext_domain)
1745 zlog_debug ("ISIS-Snp (%s): Rcvd L%d %cSNP on %s, "
1746 "skipping: circuit externalDomain = true",
1747 circuit->area->area_tag,
1748 level, typechar, circuit->interface->name);
1753 /* 7.3.15.2 a) 2,3 - manualL2OnlyMode not implemented */
1754 if (!accept_level (level, circuit->is_type))
1757 zlog_debug ("ISIS-Snp (%s): Rcvd L%d %cSNP on %s, "
1758 "skipping: circuit type %s does not match level %d",
1759 circuit->area->area_tag,
1762 circuit->interface->name,
1763 circuit_t2string (circuit->is_type), level);
1768 /* 7.3.15.2 a) 4 - not applicable for CSNP only PSNPs on broadcast */
1769 if ((snp_type == ISIS_SNP_PSNP_FLAG) &&
1770 (circuit->circ_type == CIRCUIT_T_BROADCAST) &&
1771 (!circuit->u.bc.is_dr[level - 1]))
1773 zlog_debug ("ISIS-Snp (%s): Rcvd L%d %cSNP from %s on %s, "
1774 "skipping: we are not the DIS",
1775 circuit->area->area_tag,
1777 typechar, snpa_print (ssnpa), circuit->interface->name);
1782 /* 7.3.15.2 a) 5 - need to make sure IDLength matches - already checked */
1784 /* 7.3.15.2 a) 6 - maximum area match, can be ommited since we only use 3
1785 * - already checked */
1787 /* 7.3.15.2 a) 7 - Must check that we have an adjacency of the same level */
1788 /* for broadcast circuits, snpa should be compared */
1789 /* FIXME : Do we need to check SNPA? */
1790 if (circuit->circ_type == CIRCUIT_T_BROADCAST)
1792 if (snp_type == ISIS_SNP_CSNP_FLAG)
1795 isis_adj_lookup (chdr->source_id, circuit->u.bc.adjdb[level - 1]);
1799 /* a psnp on a broadcast, how lovely of Juniper :) */
1801 isis_adj_lookup (phdr->source_id, circuit->u.bc.adjdb[level - 1]);
1804 return ISIS_OK; /* Silently discard */
1808 if (!circuit->u.p2p.neighbor)
1810 zlog_warn ("no p2p neighbor on circuit %s", circuit->interface->name);
1811 return ISIS_OK; /* Silently discard */
1815 /* 7.3.15.2 a) 8 - Passwords for level 1 - not implemented */
1817 /* 7.3.15.2 a) 9 - Passwords for level 2 - not implemented */
1819 memset (&tlvs, 0, sizeof (struct tlvs));
1822 expected |= TLVFLAG_LSP_ENTRIES;
1823 expected |= TLVFLAG_AUTH_INFO;
1825 auth_tlv_offset = stream_get_getp (circuit->rcv_stream);
1826 retval = parse_tlvs (circuit->area->area_tag,
1827 STREAM_PNT (circuit->rcv_stream),
1828 pdu_len - stream_get_getp (circuit->rcv_stream),
1829 &expected, &found, &tlvs, &auth_tlv_offset);
1831 if (retval > ISIS_WARNING)
1833 zlog_warn ("something went very wrong processing SNP");
1838 if (level == IS_LEVEL_1)
1839 passwd = &circuit->area->area_passwd;
1841 passwd = &circuit->area->domain_passwd;
1843 if (CHECK_FLAG(passwd->snp_auth, SNP_AUTH_RECV))
1847 if (!(found & TLVFLAG_AUTH_INFO) ||
1848 authentication_check (&tlvs.auth_info, passwd,
1849 circuit->rcv_stream, auth_tlv_offset))
1851 isis_event_auth_failure (circuit->area->area_tag,
1852 "SNP authentication" " failure",
1853 phdr ? phdr->source_id :
1861 /* debug isis snp-packets */
1862 if (isis->debugs & DEBUG_SNP_PACKETS)
1864 zlog_debug ("ISIS-Snp (%s): Rcvd L%d %cSNP from %s on %s",
1865 circuit->area->area_tag,
1867 typechar, snpa_print (ssnpa), circuit->interface->name);
1868 if (tlvs.lsp_entries)
1870 for (ALL_LIST_ELEMENTS_RO (tlvs.lsp_entries, node, entry))
1872 zlog_debug ("ISIS-Snp (%s): %cSNP entry %s, seq 0x%08x,"
1873 " cksum 0x%04x, lifetime %us",
1874 circuit->area->area_tag,
1876 rawlspid_print (entry->lsp_id),
1877 ntohl (entry->seq_num),
1878 ntohs (entry->checksum), ntohs (entry->rem_lifetime));
1883 /* 7.3.15.2 b) Actions on LSP_ENTRIES reported */
1884 if (tlvs.lsp_entries)
1886 for (ALL_LIST_ELEMENTS_RO (tlvs.lsp_entries, node, entry))
1888 lsp = lsp_search (entry->lsp_id, circuit->area->lspdb[level - 1]);
1889 own_lsp = !memcmp (entry->lsp_id, isis->sysid, ISIS_SYS_ID_LEN);
1892 /* 7.3.15.2 b) 1) is this LSP newer */
1893 cmp = lsp_compare (circuit->area->area_tag, lsp, entry->seq_num,
1894 entry->checksum, entry->rem_lifetime);
1895 /* 7.3.15.2 b) 2) if it equals, clear SRM on p2p */
1896 if (cmp == LSP_EQUAL)
1898 /* if (circuit->circ_type != CIRCUIT_T_BROADCAST) */
1899 ISIS_CLEAR_FLAG (lsp->SRMflags, circuit);
1901 /* 7.3.15.2 b) 3) if it is older, clear SSN and set SRM */
1902 else if (cmp == LSP_OLDER)
1904 ISIS_CLEAR_FLAG (lsp->SSNflags, circuit);
1905 ISIS_SET_FLAG (lsp->SRMflags, circuit);
1907 /* 7.3.15.2 b) 4) if it is newer, set SSN and clear SRM on p2p */
1912 lsp_inc_seqnum (lsp, ntohl (entry->seq_num));
1913 ISIS_SET_FLAG (lsp->SRMflags, circuit);
1917 ISIS_SET_FLAG (lsp->SSNflags, circuit);
1918 /* if (circuit->circ_type != CIRCUIT_T_BROADCAST) */
1919 ISIS_CLEAR_FLAG (lsp->SRMflags, circuit);
1925 /* 7.3.15.2 b) 5) if it was not found, and all of those are not 0,
1926 * insert it and set SSN on it */
1927 if (entry->rem_lifetime && entry->checksum && entry->seq_num &&
1928 memcmp (entry->lsp_id, isis->sysid, ISIS_SYS_ID_LEN))
1930 lsp = lsp_new(circuit->area, entry->lsp_id,
1931 ntohs(entry->rem_lifetime),
1932 0, 0, entry->checksum, level);
1933 lsp_insert (lsp, circuit->area->lspdb[level - 1]);
1934 ISIS_FLAGS_CLEAR_ALL (lsp->SRMflags);
1935 ISIS_SET_FLAG (lsp->SSNflags, circuit);
1941 /* 7.3.15.2 c) on CSNP set SRM for all in range which were not reported */
1942 if (snp_type == ISIS_SNP_CSNP_FLAG)
1945 * Build a list from our own LSP db bounded with
1946 * start_lsp_id and stop_lsp_id
1948 lsp_list = list_new ();
1949 lsp_build_list_nonzero_ht (chdr->start_lsp_id, chdr->stop_lsp_id,
1950 lsp_list, circuit->area->lspdb[level - 1]);
1952 /* Fixme: Find a better solution */
1953 if (tlvs.lsp_entries)
1955 for (ALL_LIST_ELEMENTS (tlvs.lsp_entries, node, nnode, entry))
1957 for (ALL_LIST_ELEMENTS (lsp_list, node2, nnode2, lsp))
1959 if (lsp_id_cmp (lsp->lsp_header->lsp_id, entry->lsp_id) == 0)
1961 list_delete_node (lsp_list, node2);
1967 /* on remaining LSPs we set SRM (neighbor knew not of) */
1968 for (ALL_LIST_ELEMENTS_RO (lsp_list, node, lsp))
1969 ISIS_SET_FLAG (lsp->SRMflags, circuit);
1971 list_delete (lsp_list);
1980 process_csnp (int level, struct isis_circuit *circuit, const u_char *ssnpa)
1982 if (isis->debugs & DEBUG_SNP_PACKETS)
1984 zlog_debug ("ISIS-Snp (%s): Rcvd L%d CSNP on %s, cirType %s, cirID %u",
1985 circuit->area->area_tag, level, circuit->interface->name,
1986 circuit_t2string (circuit->is_type), circuit->circuit_id);
1987 if (isis->debugs & DEBUG_PACKET_DUMP)
1988 zlog_dump_data (STREAM_DATA (circuit->rcv_stream),
1989 stream_get_endp (circuit->rcv_stream));
1992 /* Sanity check - FIXME: move to correct place */
1993 if ((stream_get_endp (circuit->rcv_stream) -
1994 stream_get_getp (circuit->rcv_stream)) < ISIS_CSNP_HDRLEN)
1996 zlog_warn ("Packet too short ( < %d)", ISIS_CSNP_HDRLEN);
1997 return ISIS_WARNING;
2000 return process_snp (ISIS_SNP_CSNP_FLAG, level, circuit, ssnpa);
2004 process_psnp (int level, struct isis_circuit *circuit, const u_char *ssnpa)
2006 if (isis->debugs & DEBUG_SNP_PACKETS)
2008 zlog_debug ("ISIS-Snp (%s): Rcvd L%d PSNP on %s, cirType %s, cirID %u",
2009 circuit->area->area_tag, level, circuit->interface->name,
2010 circuit_t2string (circuit->is_type), circuit->circuit_id);
2011 if (isis->debugs & DEBUG_PACKET_DUMP)
2012 zlog_dump_data (STREAM_DATA (circuit->rcv_stream),
2013 stream_get_endp (circuit->rcv_stream));
2016 if ((stream_get_endp (circuit->rcv_stream) -
2017 stream_get_getp (circuit->rcv_stream)) < ISIS_PSNP_HDRLEN)
2019 zlog_warn ("Packet too short ( < %d)", ISIS_PSNP_HDRLEN);
2020 return ISIS_WARNING;
2023 return process_snp (ISIS_SNP_PSNP_FLAG, level, circuit, ssnpa);
2031 isis_handle_pdu (struct isis_circuit *circuit, u_char * ssnpa)
2033 struct isis_fixed_hdr *hdr;
2035 int retval = ISIS_OK;
2038 * Let's first read data from stream to the header
2040 hdr = (struct isis_fixed_hdr *) STREAM_DATA (circuit->rcv_stream);
2042 if ((hdr->idrp != ISO10589_ISIS) && (hdr->idrp != ISO9542_ESIS))
2044 zlog_err ("Not an IS-IS or ES-IS packet IDRP=%02x", hdr->idrp);
2048 /* now we need to know if this is an ISO 9542 packet and
2049 * take real good care of it, waaa!
2051 if (hdr->idrp == ISO9542_ESIS)
2053 zlog_err ("No support for ES-IS packet IDRP=%02x", hdr->idrp);
2056 stream_set_getp (circuit->rcv_stream, ISIS_FIXED_HDR_LEN);
2059 * and then process it
2062 if (hdr->length < ISIS_MINIMUM_FIXED_HDR_LEN)
2064 zlog_err ("Fixed header length = %d", hdr->length);
2068 if (hdr->version1 != 1)
2070 zlog_warn ("Unsupported ISIS version %u", hdr->version1);
2071 return ISIS_WARNING;
2074 if ((hdr->id_len != 0) && (hdr->id_len != ISIS_SYS_ID_LEN))
2077 ("IDFieldLengthMismatch: ID Length field in a received PDU %u, "
2078 "while the parameter for this IS is %u", hdr->id_len,
2083 if (hdr->version2 != 1)
2085 zlog_warn ("Unsupported ISIS version %u", hdr->version2);
2086 return ISIS_WARNING;
2089 if (circuit->is_passive)
2091 zlog_warn ("Received ISIS PDU on passive circuit %s",
2092 circuit->interface->name);
2093 return ISIS_WARNING;
2097 if ((hdr->max_area_addrs != 0)
2098 && (hdr->max_area_addrs != isis->max_area_addrs))
2100 zlog_err ("maximumAreaAddressesMismatch: maximumAreaAdresses in a "
2101 "received PDU %u while the parameter for this IS is %u",
2102 hdr->max_area_addrs, isis->max_area_addrs);
2106 switch (hdr->pdu_type)
2109 retval = process_lan_hello (ISIS_LEVEL1, circuit, ssnpa);
2112 retval = process_lan_hello (ISIS_LEVEL2, circuit, ssnpa);
2115 retval = process_p2p_hello (circuit);
2118 retval = process_lsp (ISIS_LEVEL1, circuit, ssnpa);
2121 retval = process_lsp (ISIS_LEVEL2, circuit, ssnpa);
2123 case L1_COMPLETE_SEQ_NUM:
2124 retval = process_csnp (ISIS_LEVEL1, circuit, ssnpa);
2126 case L2_COMPLETE_SEQ_NUM:
2127 retval = process_csnp (ISIS_LEVEL2, circuit, ssnpa);
2129 case L1_PARTIAL_SEQ_NUM:
2130 retval = process_psnp (ISIS_LEVEL1, circuit, ssnpa);
2132 case L2_PARTIAL_SEQ_NUM:
2133 retval = process_psnp (ISIS_LEVEL2, circuit, ssnpa);
2144 isis_receive (struct thread *thread)
2146 struct isis_circuit *circuit;
2147 u_char ssnpa[ETH_ALEN];
2153 circuit = THREAD_ARG (thread);
2156 isis_circuit_stream(circuit, &circuit->rcv_stream);
2158 retval = circuit->rx (circuit, ssnpa);
2159 circuit->t_read = NULL;
2161 if (retval == ISIS_OK)
2162 retval = isis_handle_pdu (circuit, ssnpa);
2165 * prepare for next packet.
2167 if (!circuit->is_passive)
2169 THREAD_READ_ON (master, circuit->t_read, isis_receive, circuit,
2178 isis_receive (struct thread *thread)
2180 struct isis_circuit *circuit;
2181 u_char ssnpa[ETH_ALEN];
2187 circuit = THREAD_ARG (thread);
2190 circuit->t_read = NULL;
2192 isis_circuit_stream(circuit, &circuit->rcv_stream);
2194 retval = circuit->rx (circuit, ssnpa);
2196 if (retval == ISIS_OK)
2197 retval = isis_handle_pdu (circuit, ssnpa);
2200 * prepare for next packet.
2202 if (!circuit->is_passive)
2204 circuit->t_read = thread_add_timer_msec (master, isis_receive, circuit,
2206 (circuit->area->circuit_list) *
2215 /* filling of the fixed isis header */
2217 fill_fixed_hdr (struct isis_fixed_hdr *hdr, u_char pdu_type)
2219 memset (hdr, 0, sizeof (struct isis_fixed_hdr));
2221 hdr->idrp = ISO10589_ISIS;
2227 hdr->length = ISIS_LANHELLO_HDRLEN;
2230 hdr->length = ISIS_P2PHELLO_HDRLEN;
2234 hdr->length = ISIS_LSP_HDR_LEN;
2236 case L1_COMPLETE_SEQ_NUM:
2237 case L2_COMPLETE_SEQ_NUM:
2238 hdr->length = ISIS_CSNP_HDRLEN;
2240 case L1_PARTIAL_SEQ_NUM:
2241 case L2_PARTIAL_SEQ_NUM:
2242 hdr->length = ISIS_PSNP_HDRLEN;
2245 zlog_warn ("fill_fixed_hdr(): unknown pdu type %d", pdu_type);
2248 hdr->length += ISIS_FIXED_HDR_LEN;
2249 hdr->pdu_type = pdu_type;
2251 hdr->id_len = 0; /* ISIS_SYS_ID_LEN - 0==6 */
2253 hdr->max_area_addrs = 0; /* isis->max_area_addrs - 0==3 */
2260 fill_fixed_hdr_andstream (struct isis_fixed_hdr *hdr, u_char pdu_type,
2261 struct stream *stream)
2263 fill_fixed_hdr (hdr, pdu_type);
2265 stream_putc (stream, hdr->idrp);
2266 stream_putc (stream, hdr->length);
2267 stream_putc (stream, hdr->version1);
2268 stream_putc (stream, hdr->id_len);
2269 stream_putc (stream, hdr->pdu_type);
2270 stream_putc (stream, hdr->version2);
2271 stream_putc (stream, hdr->reserved);
2272 stream_putc (stream, hdr->max_area_addrs);
2278 send_hello (struct isis_circuit *circuit, int level)
2280 struct isis_fixed_hdr fixed_hdr;
2281 struct isis_lan_hello_hdr hello_hdr;
2282 struct isis_p2p_hello_hdr p2p_hello_hdr;
2283 unsigned char hmac_md5_hash[ISIS_AUTH_MD5_SIZE];
2284 size_t len_pointer, length, auth_tlv_offset = 0;
2288 if (circuit->is_passive)
2291 if (circuit->interface->mtu == 0)
2293 zlog_warn ("circuit has zero MTU");
2294 return ISIS_WARNING;
2297 isis_circuit_stream(circuit, &circuit->snd_stream);
2299 if (circuit->circ_type == CIRCUIT_T_BROADCAST)
2300 if (level == IS_LEVEL_1)
2301 fill_fixed_hdr_andstream (&fixed_hdr, L1_LAN_HELLO,
2302 circuit->snd_stream);
2304 fill_fixed_hdr_andstream (&fixed_hdr, L2_LAN_HELLO,
2305 circuit->snd_stream);
2307 fill_fixed_hdr_andstream (&fixed_hdr, P2P_HELLO, circuit->snd_stream);
2310 * Fill LAN Level 1 or 2 Hello PDU header
2312 memset (&hello_hdr, 0, sizeof (struct isis_lan_hello_hdr));
2313 interval = circuit->hello_multiplier[level - 1] *
2314 circuit->hello_interval[level - 1];
2315 if (interval > USHRT_MAX)
2316 interval = USHRT_MAX;
2317 hello_hdr.circuit_t = circuit->is_type;
2318 memcpy (hello_hdr.source_id, isis->sysid, ISIS_SYS_ID_LEN);
2319 hello_hdr.hold_time = htons ((u_int16_t) interval);
2321 hello_hdr.pdu_len = 0; /* Update the PDU Length later */
2322 len_pointer = stream_get_endp (circuit->snd_stream) + 3 + ISIS_SYS_ID_LEN;
2324 /* copy the shared part of the hello to the p2p hello if needed */
2325 if (circuit->circ_type == CIRCUIT_T_P2P)
2327 memcpy (&p2p_hello_hdr, &hello_hdr, 5 + ISIS_SYS_ID_LEN);
2328 p2p_hello_hdr.local_id = circuit->circuit_id;
2329 /* FIXME: need better understanding */
2330 stream_put (circuit->snd_stream, &p2p_hello_hdr, ISIS_P2PHELLO_HDRLEN);
2334 hello_hdr.prio = circuit->priority[level - 1];
2335 if (level == IS_LEVEL_1)
2337 memcpy (hello_hdr.lan_id, circuit->u.bc.l1_desig_is,
2338 ISIS_SYS_ID_LEN + 1);
2340 else if (level == IS_LEVEL_2)
2342 memcpy (hello_hdr.lan_id, circuit->u.bc.l2_desig_is,
2343 ISIS_SYS_ID_LEN + 1);
2345 stream_put (circuit->snd_stream, &hello_hdr, ISIS_LANHELLO_HDRLEN);
2349 * Then the variable length part.
2352 /* add circuit password */
2353 switch (circuit->passwd.type)
2356 case ISIS_PASSWD_TYPE_CLEARTXT:
2357 if (tlv_add_authinfo (circuit->passwd.type, circuit->passwd.len,
2358 circuit->passwd.passwd, circuit->snd_stream))
2359 return ISIS_WARNING;
2363 case ISIS_PASSWD_TYPE_HMAC_MD5:
2364 /* Remember where TLV is written so we can later overwrite the MD5 hash */
2365 auth_tlv_offset = stream_get_endp (circuit->snd_stream);
2366 memset(&hmac_md5_hash, 0, ISIS_AUTH_MD5_SIZE);
2367 if (tlv_add_authinfo (circuit->passwd.type, ISIS_AUTH_MD5_SIZE,
2368 hmac_md5_hash, circuit->snd_stream))
2369 return ISIS_WARNING;
2376 /* Area Addresses TLV */
2377 if (listcount (circuit->area->area_addrs) == 0)
2378 return ISIS_WARNING;
2379 if (tlv_add_area_addrs (circuit->area->area_addrs, circuit->snd_stream))
2380 return ISIS_WARNING;
2382 /* LAN Neighbors TLV */
2383 if (circuit->circ_type == CIRCUIT_T_BROADCAST)
2385 if (level == IS_LEVEL_1 && circuit->u.bc.lan_neighs[0] &&
2386 listcount (circuit->u.bc.lan_neighs[0]) > 0)
2387 if (tlv_add_lan_neighs (circuit->u.bc.lan_neighs[0],
2388 circuit->snd_stream))
2389 return ISIS_WARNING;
2390 if (level == IS_LEVEL_2 && circuit->u.bc.lan_neighs[1] &&
2391 listcount (circuit->u.bc.lan_neighs[1]) > 0)
2392 if (tlv_add_lan_neighs (circuit->u.bc.lan_neighs[1],
2393 circuit->snd_stream))
2394 return ISIS_WARNING;
2397 /* Protocols Supported TLV */
2398 if (circuit->nlpids.count > 0)
2399 if (tlv_add_nlpid (&circuit->nlpids, circuit->snd_stream))
2400 return ISIS_WARNING;
2401 /* IP interface Address TLV */
2402 if (circuit->ip_router && circuit->ip_addrs &&
2403 listcount (circuit->ip_addrs) > 0)
2404 if (tlv_add_ip_addrs (circuit->ip_addrs, circuit->snd_stream))
2405 return ISIS_WARNING;
2408 /* IPv6 Interface Address TLV */
2409 if (circuit->ipv6_router && circuit->ipv6_link &&
2410 listcount (circuit->ipv6_link) > 0)
2411 if (tlv_add_ipv6_addrs (circuit->ipv6_link, circuit->snd_stream))
2412 return ISIS_WARNING;
2413 #endif /* HAVE_IPV6 */
2415 if (circuit->pad_hellos)
2416 if (tlv_add_padding (circuit->snd_stream))
2417 return ISIS_WARNING;
2419 length = stream_get_endp (circuit->snd_stream);
2420 /* Update PDU length */
2421 stream_putw_at (circuit->snd_stream, len_pointer, (u_int16_t) length);
2423 /* For HMAC MD5 we need to compute the md5 hash and store it */
2424 if (circuit->passwd.type == ISIS_PASSWD_TYPE_HMAC_MD5)
2426 hmac_md5 (STREAM_DATA (circuit->snd_stream),
2427 stream_get_endp (circuit->snd_stream),
2428 (unsigned char *) &circuit->passwd.passwd, circuit->passwd.len,
2429 (unsigned char *) &hmac_md5_hash);
2430 /* Copy the hash into the stream */
2431 memcpy (STREAM_DATA (circuit->snd_stream) + auth_tlv_offset + 3,
2432 hmac_md5_hash, ISIS_AUTH_MD5_SIZE);
2435 if (isis->debugs & DEBUG_ADJ_PACKETS)
2437 if (circuit->circ_type == CIRCUIT_T_BROADCAST)
2439 zlog_debug ("ISIS-Adj (%s): Sending L%d LAN IIH on %s, length %zd",
2440 circuit->area->area_tag, level, circuit->interface->name,
2445 zlog_debug ("ISIS-Adj (%s): Sending P2P IIH on %s, length %zd",
2446 circuit->area->area_tag, circuit->interface->name,
2449 if (isis->debugs & DEBUG_PACKET_DUMP)
2450 zlog_dump_data (STREAM_DATA (circuit->snd_stream),
2451 stream_get_endp (circuit->snd_stream));
2454 retval = circuit->tx (circuit, level);
2455 if (retval != ISIS_OK)
2456 zlog_err ("ISIS-Adj (%s): Send L%d IIH on %s failed",
2457 circuit->area->area_tag, level, circuit->interface->name);
2463 send_lan_l1_hello (struct thread *thread)
2465 struct isis_circuit *circuit;
2468 circuit = THREAD_ARG (thread);
2470 circuit->u.bc.t_send_lan_hello[0] = NULL;
2472 if (!(circuit->area->is_type & IS_LEVEL_1))
2474 zlog_warn ("ISIS-Hello (%s): Trying to send L1 IIH in L2-only area",
2475 circuit->area->area_tag);
2479 if (circuit->u.bc.run_dr_elect[0])
2480 retval = isis_dr_elect (circuit, 1);
2482 retval = send_hello (circuit, 1);
2484 /* set next timer thread */
2485 THREAD_TIMER_ON (master, circuit->u.bc.t_send_lan_hello[0],
2486 send_lan_l1_hello, circuit,
2487 isis_jitter (circuit->hello_interval[0], IIH_JITTER));
2493 send_lan_l2_hello (struct thread *thread)
2495 struct isis_circuit *circuit;
2498 circuit = THREAD_ARG (thread);
2500 circuit->u.bc.t_send_lan_hello[1] = NULL;
2502 if (!(circuit->area->is_type & IS_LEVEL_2))
2504 zlog_warn ("ISIS-Hello (%s): Trying to send L2 IIH in L1 area",
2505 circuit->area->area_tag);
2509 if (circuit->u.bc.run_dr_elect[1])
2510 retval = isis_dr_elect (circuit, 2);
2512 retval = send_hello (circuit, 2);
2514 /* set next timer thread */
2515 THREAD_TIMER_ON (master, circuit->u.bc.t_send_lan_hello[1],
2516 send_lan_l2_hello, circuit,
2517 isis_jitter (circuit->hello_interval[1], IIH_JITTER));
2523 send_p2p_hello (struct thread *thread)
2525 struct isis_circuit *circuit;
2527 circuit = THREAD_ARG (thread);
2529 circuit->u.p2p.t_send_p2p_hello = NULL;
2531 send_hello (circuit, 1);
2533 /* set next timer thread */
2534 THREAD_TIMER_ON (master, circuit->u.p2p.t_send_p2p_hello, send_p2p_hello,
2535 circuit, isis_jitter (circuit->hello_interval[1],
2542 build_csnp (int level, u_char * start, u_char * stop, struct list *lsps,
2543 struct isis_circuit *circuit)
2545 struct isis_fixed_hdr fixed_hdr;
2546 struct isis_passwd *passwd;
2549 unsigned char hmac_md5_hash[ISIS_AUTH_MD5_SIZE];
2550 unsigned long auth_tlv_offset = 0;
2551 int retval = ISIS_OK;
2553 isis_circuit_stream(circuit, &circuit->snd_stream);
2555 if (level == IS_LEVEL_1)
2556 fill_fixed_hdr_andstream (&fixed_hdr, L1_COMPLETE_SEQ_NUM,
2557 circuit->snd_stream);
2559 fill_fixed_hdr_andstream (&fixed_hdr, L2_COMPLETE_SEQ_NUM,
2560 circuit->snd_stream);
2563 * Fill Level 1 or 2 Complete Sequence Numbers header
2566 lenp = stream_get_endp (circuit->snd_stream);
2567 stream_putw (circuit->snd_stream, 0); /* PDU length - when we know it */
2568 /* no need to send the source here, it is always us if we csnp */
2569 stream_put (circuit->snd_stream, isis->sysid, ISIS_SYS_ID_LEN);
2570 /* with zero circuit id - ref 9.10, 9.11 */
2571 stream_putc (circuit->snd_stream, 0x00);
2573 stream_put (circuit->snd_stream, start, ISIS_SYS_ID_LEN + 2);
2574 stream_put (circuit->snd_stream, stop, ISIS_SYS_ID_LEN + 2);
2579 if (level == IS_LEVEL_1)
2580 passwd = &circuit->area->area_passwd;
2582 passwd = &circuit->area->domain_passwd;
2584 if (CHECK_FLAG(passwd->snp_auth, SNP_AUTH_SEND))
2586 switch (passwd->type)
2589 case ISIS_PASSWD_TYPE_CLEARTXT:
2590 if (tlv_add_authinfo (ISIS_PASSWD_TYPE_CLEARTXT, passwd->len,
2591 passwd->passwd, circuit->snd_stream))
2592 return ISIS_WARNING;
2596 case ISIS_PASSWD_TYPE_HMAC_MD5:
2597 /* Remember where TLV is written so we can later overwrite the MD5 hash */
2598 auth_tlv_offset = stream_get_endp (circuit->snd_stream);
2599 memset(&hmac_md5_hash, 0, ISIS_AUTH_MD5_SIZE);
2600 if (tlv_add_authinfo (ISIS_PASSWD_TYPE_HMAC_MD5, ISIS_AUTH_MD5_SIZE,
2601 hmac_md5_hash, circuit->snd_stream))
2602 return ISIS_WARNING;
2610 retval = tlv_add_lsp_entries (lsps, circuit->snd_stream);
2611 if (retval != ISIS_OK)
2614 length = (u_int16_t) stream_get_endp (circuit->snd_stream);
2615 /* Update PU length */
2616 stream_putw_at (circuit->snd_stream, lenp, length);
2618 /* For HMAC MD5 we need to compute the md5 hash and store it */
2619 if (CHECK_FLAG(passwd->snp_auth, SNP_AUTH_SEND) &&
2620 passwd->type == ISIS_PASSWD_TYPE_HMAC_MD5)
2622 hmac_md5 (STREAM_DATA (circuit->snd_stream),
2623 stream_get_endp(circuit->snd_stream),
2624 (unsigned char *) &passwd->passwd, passwd->len,
2625 (unsigned char *) &hmac_md5_hash);
2626 /* Copy the hash into the stream */
2627 memcpy (STREAM_DATA (circuit->snd_stream) + auth_tlv_offset + 3,
2628 hmac_md5_hash, ISIS_AUTH_MD5_SIZE);
2635 * Count the maximum number of lsps that can be accomodated by a given size.
2638 get_max_lsp_count (uint16_t size)
2642 uint16_t remaining_size;
2644 /* First count the full size TLVs */
2645 tlv_count = size / MAX_LSP_ENTRIES_TLV_SIZE;
2646 lsp_count = tlv_count * (MAX_LSP_ENTRIES_TLV_SIZE / LSP_ENTRIES_LEN);
2648 /* The last TLV, if any */
2649 remaining_size = size % MAX_LSP_ENTRIES_TLV_SIZE;
2650 if (remaining_size - 2 >= LSP_ENTRIES_LEN)
2651 lsp_count += (remaining_size - 2) / LSP_ENTRIES_LEN;
2657 * Calculate the length of Authentication Info. TLV.
2660 auth_tlv_length (int level, struct isis_circuit *circuit)
2662 struct isis_passwd *passwd;
2665 if (level == IS_LEVEL_1)
2666 passwd = &circuit->area->area_passwd;
2668 passwd = &circuit->area->domain_passwd;
2670 /* Also include the length of TLV header */
2671 length = AUTH_INFO_HDRLEN;
2672 if (CHECK_FLAG(passwd->snp_auth, SNP_AUTH_SEND))
2674 switch (passwd->type)
2677 case ISIS_PASSWD_TYPE_CLEARTXT:
2678 length += passwd->len;
2682 case ISIS_PASSWD_TYPE_HMAC_MD5:
2683 length += ISIS_AUTH_MD5_SIZE;
2695 * Calculate the maximum number of lsps that can be accomodated in a CSNP/PSNP.
2698 max_lsps_per_snp (int snp_type, int level, struct isis_circuit *circuit)
2704 snp_hdr_len = ISIS_FIXED_HDR_LEN;
2705 if (snp_type == ISIS_SNP_CSNP_FLAG)
2706 snp_hdr_len += ISIS_CSNP_HDRLEN;
2708 snp_hdr_len += ISIS_PSNP_HDRLEN;
2710 auth_tlv_len = auth_tlv_length (level, circuit);
2711 lsp_count = get_max_lsp_count (
2712 stream_get_size (circuit->snd_stream) - snp_hdr_len - auth_tlv_len);
2717 * FIXME: support multiple CSNPs
2721 send_csnp (struct isis_circuit *circuit, int level)
2723 u_char start[ISIS_SYS_ID_LEN + 2];
2724 u_char stop[ISIS_SYS_ID_LEN + 2];
2725 struct list *list = NULL;
2726 struct listnode *node;
2727 struct isis_lsp *lsp;
2728 u_char num_lsps, loop = 1;
2729 int i, retval = ISIS_OK;
2731 if (circuit->area->lspdb[level - 1] == NULL ||
2732 dict_count (circuit->area->lspdb[level - 1]) == 0)
2735 memset (start, 0x00, ISIS_SYS_ID_LEN + 2);
2736 memset (stop, 0xff, ISIS_SYS_ID_LEN + 2);
2738 num_lsps = max_lsps_per_snp (ISIS_SNP_CSNP_FLAG, level, circuit);
2743 lsp_build_list (start, stop, num_lsps, list,
2744 circuit->area->lspdb[level - 1]);
2746 * Update the stop lsp_id before encoding this CSNP.
2748 if (listcount (list) < num_lsps)
2750 memset (stop, 0xff, ISIS_SYS_ID_LEN + 2);
2754 node = listtail (list);
2755 lsp = listgetdata (node);
2756 memcpy (stop, lsp->lsp_header->lsp_id, ISIS_SYS_ID_LEN + 2);
2759 retval = build_csnp (level, start, stop, list, circuit);
2760 if (retval != ISIS_OK)
2762 zlog_err ("ISIS-Snp (%s): Build L%d CSNP on %s failed",
2763 circuit->area->area_tag, level, circuit->interface->name);
2768 if (isis->debugs & DEBUG_SNP_PACKETS)
2770 zlog_debug ("ISIS-Snp (%s): Sending L%d CSNP on %s, length %zd",
2771 circuit->area->area_tag, level, circuit->interface->name,
2772 stream_get_endp (circuit->snd_stream));
2773 for (ALL_LIST_ELEMENTS_RO (list, node, lsp))
2775 zlog_debug ("ISIS-Snp (%s): CSNP entry %s, seq 0x%08x,"
2776 " cksum 0x%04x, lifetime %us",
2777 circuit->area->area_tag,
2778 rawlspid_print (lsp->lsp_header->lsp_id),
2779 ntohl (lsp->lsp_header->seq_num),
2780 ntohs (lsp->lsp_header->checksum),
2781 ntohs (lsp->lsp_header->rem_lifetime));
2783 if (isis->debugs & DEBUG_PACKET_DUMP)
2784 zlog_dump_data (STREAM_DATA (circuit->snd_stream),
2785 stream_get_endp (circuit->snd_stream));
2788 retval = circuit->tx (circuit, level);
2789 if (retval != ISIS_OK)
2791 zlog_err ("ISIS-Snp (%s): Send L%d CSNP on %s failed",
2792 circuit->area->area_tag, level,
2793 circuit->interface->name);
2799 * Start lsp_id of the next CSNP should be one plus the
2800 * stop lsp_id in this current CSNP.
2802 memcpy (start, stop, ISIS_SYS_ID_LEN + 2);
2804 for (i = ISIS_SYS_ID_LEN + 1; i >= 0; --i)
2806 if (start[i] < (u_char)0xff)
2813 memset (stop, 0xff, ISIS_SYS_ID_LEN + 2);
2821 send_l1_csnp (struct thread *thread)
2823 struct isis_circuit *circuit;
2824 int retval = ISIS_OK;
2826 circuit = THREAD_ARG (thread);
2829 circuit->t_send_csnp[0] = NULL;
2831 if (circuit->circ_type == CIRCUIT_T_BROADCAST && circuit->u.bc.is_dr[0])
2833 send_csnp (circuit, 1);
2835 /* set next timer thread */
2836 THREAD_TIMER_ON (master, circuit->t_send_csnp[0], send_l1_csnp, circuit,
2837 isis_jitter (circuit->csnp_interval[0], CSNP_JITTER));
2843 send_l2_csnp (struct thread *thread)
2845 struct isis_circuit *circuit;
2846 int retval = ISIS_OK;
2848 circuit = THREAD_ARG (thread);
2851 circuit->t_send_csnp[1] = NULL;
2853 if (circuit->circ_type == CIRCUIT_T_BROADCAST && circuit->u.bc.is_dr[1])
2855 send_csnp (circuit, 2);
2857 /* set next timer thread */
2858 THREAD_TIMER_ON (master, circuit->t_send_csnp[1], send_l2_csnp, circuit,
2859 isis_jitter (circuit->csnp_interval[1], CSNP_JITTER));
2865 build_psnp (int level, struct isis_circuit *circuit, struct list *lsps)
2867 struct isis_fixed_hdr fixed_hdr;
2870 struct isis_lsp *lsp;
2871 struct isis_passwd *passwd;
2872 struct listnode *node;
2873 unsigned char hmac_md5_hash[ISIS_AUTH_MD5_SIZE];
2874 unsigned long auth_tlv_offset = 0;
2875 int retval = ISIS_OK;
2877 isis_circuit_stream(circuit, &circuit->snd_stream);
2879 if (level == IS_LEVEL_1)
2880 fill_fixed_hdr_andstream (&fixed_hdr, L1_PARTIAL_SEQ_NUM,
2881 circuit->snd_stream);
2883 fill_fixed_hdr_andstream (&fixed_hdr, L2_PARTIAL_SEQ_NUM,
2884 circuit->snd_stream);
2887 * Fill Level 1 or 2 Partial Sequence Numbers header
2889 lenp = stream_get_endp (circuit->snd_stream);
2890 stream_putw (circuit->snd_stream, 0); /* PDU length - when we know it */
2891 stream_put (circuit->snd_stream, isis->sysid, ISIS_SYS_ID_LEN);
2892 stream_putc (circuit->snd_stream, circuit->idx);
2898 if (level == IS_LEVEL_1)
2899 passwd = &circuit->area->area_passwd;
2901 passwd = &circuit->area->domain_passwd;
2903 if (CHECK_FLAG(passwd->snp_auth, SNP_AUTH_SEND))
2905 switch (passwd->type)
2908 case ISIS_PASSWD_TYPE_CLEARTXT:
2909 if (tlv_add_authinfo (ISIS_PASSWD_TYPE_CLEARTXT, passwd->len,
2910 passwd->passwd, circuit->snd_stream))
2911 return ISIS_WARNING;
2915 case ISIS_PASSWD_TYPE_HMAC_MD5:
2916 /* Remember where TLV is written so we can later overwrite the MD5 hash */
2917 auth_tlv_offset = stream_get_endp (circuit->snd_stream);
2918 memset(&hmac_md5_hash, 0, ISIS_AUTH_MD5_SIZE);
2919 if (tlv_add_authinfo (ISIS_PASSWD_TYPE_HMAC_MD5, ISIS_AUTH_MD5_SIZE,
2920 hmac_md5_hash, circuit->snd_stream))
2921 return ISIS_WARNING;
2929 retval = tlv_add_lsp_entries (lsps, circuit->snd_stream);
2930 if (retval != ISIS_OK)
2933 if (isis->debugs & DEBUG_SNP_PACKETS)
2935 for (ALL_LIST_ELEMENTS_RO (lsps, node, lsp))
2937 zlog_debug ("ISIS-Snp (%s): PSNP entry %s, seq 0x%08x,"
2938 " cksum 0x%04x, lifetime %us",
2939 circuit->area->area_tag,
2940 rawlspid_print (lsp->lsp_header->lsp_id),
2941 ntohl (lsp->lsp_header->seq_num),
2942 ntohs (lsp->lsp_header->checksum),
2943 ntohs (lsp->lsp_header->rem_lifetime));
2947 length = (u_int16_t) stream_get_endp (circuit->snd_stream);
2948 /* Update PDU length */
2949 stream_putw_at (circuit->snd_stream, lenp, length);
2951 /* For HMAC MD5 we need to compute the md5 hash and store it */
2952 if (CHECK_FLAG(passwd->snp_auth, SNP_AUTH_SEND) &&
2953 passwd->type == ISIS_PASSWD_TYPE_HMAC_MD5)
2955 hmac_md5 (STREAM_DATA (circuit->snd_stream),
2956 stream_get_endp(circuit->snd_stream),
2957 (unsigned char *) &passwd->passwd, passwd->len,
2958 (unsigned char *) &hmac_md5_hash);
2959 /* Copy the hash into the stream */
2960 memcpy (STREAM_DATA (circuit->snd_stream) + auth_tlv_offset + 3,
2961 hmac_md5_hash, ISIS_AUTH_MD5_SIZE);
2968 * 7.3.15.4 action on expiration of partial SNP interval
2972 send_psnp (int level, struct isis_circuit *circuit)
2974 struct isis_lsp *lsp;
2975 struct list *list = NULL;
2976 struct listnode *node;
2978 int retval = ISIS_OK;
2980 if (circuit->circ_type == CIRCUIT_T_BROADCAST &&
2981 circuit->u.bc.is_dr[level - 1])
2984 if (circuit->area->lspdb[level - 1] == NULL ||
2985 dict_count (circuit->area->lspdb[level - 1]) == 0)
2988 if (! circuit->snd_stream)
2991 num_lsps = max_lsps_per_snp (ISIS_SNP_PSNP_FLAG, level, circuit);
2996 lsp_build_list_ssn (circuit, num_lsps, list,
2997 circuit->area->lspdb[level - 1]);
2999 if (listcount (list) == 0)
3005 retval = build_psnp (level, circuit, list);
3006 if (retval != ISIS_OK)
3008 zlog_err ("ISIS-Snp (%s): Build L%d PSNP on %s failed",
3009 circuit->area->area_tag, level, circuit->interface->name);
3014 if (isis->debugs & DEBUG_SNP_PACKETS)
3016 zlog_debug ("ISIS-Snp (%s): Sending L%d PSNP on %s, length %zd",
3017 circuit->area->area_tag, level,
3018 circuit->interface->name,
3019 stream_get_endp (circuit->snd_stream));
3020 if (isis->debugs & DEBUG_PACKET_DUMP)
3021 zlog_dump_data (STREAM_DATA (circuit->snd_stream),
3022 stream_get_endp (circuit->snd_stream));
3025 retval = circuit->tx (circuit, level);
3026 if (retval != ISIS_OK)
3028 zlog_err ("ISIS-Snp (%s): Send L%d PSNP on %s failed",
3029 circuit->area->area_tag, level,
3030 circuit->interface->name);
3036 * sending succeeded, we can clear SSN flags of this circuit
3037 * for the LSPs in list
3039 for (ALL_LIST_ELEMENTS_RO (list, node, lsp))
3040 ISIS_CLEAR_FLAG (lsp->SSNflags, circuit);
3048 send_l1_psnp (struct thread *thread)
3051 struct isis_circuit *circuit;
3052 int retval = ISIS_OK;
3054 circuit = THREAD_ARG (thread);
3057 circuit->t_send_psnp[0] = NULL;
3059 send_psnp (1, circuit);
3060 /* set next timer thread */
3061 THREAD_TIMER_ON (master, circuit->t_send_psnp[0], send_l1_psnp, circuit,
3062 isis_jitter (circuit->psnp_interval[0], PSNP_JITTER));
3068 * 7.3.15.4 action on expiration of partial SNP interval
3072 send_l2_psnp (struct thread *thread)
3074 struct isis_circuit *circuit;
3075 int retval = ISIS_OK;
3077 circuit = THREAD_ARG (thread);
3080 circuit->t_send_psnp[1] = NULL;
3082 send_psnp (2, circuit);
3084 /* set next timer thread */
3085 THREAD_TIMER_ON (master, circuit->t_send_psnp[1], send_l2_psnp, circuit,
3086 isis_jitter (circuit->psnp_interval[1], PSNP_JITTER));
3092 * ISO 10589 - 7.3.14.3
3095 send_lsp (struct thread *thread)
3097 struct isis_circuit *circuit;
3098 struct isis_lsp *lsp;
3099 struct listnode *node;
3101 int retval = ISIS_OK;
3103 circuit = THREAD_ARG (thread);
3106 if (!circuit->lsp_queue)
3109 node = listhead (circuit->lsp_queue);
3112 * Handle case where there are no LSPs on the queue. This can
3113 * happen, for instance, if an adjacency goes down before this
3114 * thread gets a chance to run.
3120 * Delete LSP from lsp_queue. If it's still in queue, it is assumed
3121 * as 'transmit pending', but send_lsp may never be called again.
3122 * Retry will happen because SRM flag will not be cleared.
3124 lsp = listgetdata(node);
3125 list_delete_node (circuit->lsp_queue, node);
3127 /* Set the last-cleared time if the queue is empty. */
3128 /* TODO: Is is possible that new lsps keep being added to the queue
3129 * that the queue is never empty? */
3130 if (list_isempty (circuit->lsp_queue))
3131 circuit->lsp_queue_last_cleared = time (NULL);
3133 if (circuit->state != C_STATE_UP || circuit->is_passive == 1)
3137 * Do not send if levels do not match
3139 if (!(lsp->level & circuit->is_type))
3143 * Do not send if we do not have adjacencies in state up on the circuit
3145 if (circuit->upadjcount[lsp->level - 1] == 0)
3148 /* stream_copy will assert and stop program execution if LSP is larger than
3149 * the circuit's MTU. So handle and log this case here. */
3150 if (stream_get_endp(lsp->pdu) > stream_get_size(circuit->snd_stream))
3152 zlog_err("ISIS-Upd (%s): Can't send L%d LSP %s, seq 0x%08x,"
3153 " cksum 0x%04x, lifetime %us on %s. LSP Size is %zu"
3154 " while interface stream size is %zu.",
3155 circuit->area->area_tag, lsp->level,
3156 rawlspid_print(lsp->lsp_header->lsp_id),
3157 ntohl(lsp->lsp_header->seq_num),
3158 ntohs(lsp->lsp_header->checksum),
3159 ntohs(lsp->lsp_header->rem_lifetime),
3160 circuit->interface->name,
3161 stream_get_endp(lsp->pdu),
3162 stream_get_size(circuit->snd_stream));
3163 if (isis->debugs & DEBUG_PACKET_DUMP)
3164 zlog_dump_data(STREAM_DATA(lsp->pdu), stream_get_endp(lsp->pdu));
3165 retval = ISIS_ERROR;
3169 /* copy our lsp to the send buffer */
3170 stream_copy (circuit->snd_stream, lsp->pdu);
3172 if (isis->debugs & DEBUG_UPDATE_PACKETS)
3175 ("ISIS-Upd (%s): Sending L%d LSP %s, seq 0x%08x, cksum 0x%04x,"
3176 " lifetime %us on %s", circuit->area->area_tag, lsp->level,
3177 rawlspid_print (lsp->lsp_header->lsp_id),
3178 ntohl (lsp->lsp_header->seq_num),
3179 ntohs (lsp->lsp_header->checksum),
3180 ntohs (lsp->lsp_header->rem_lifetime),
3181 circuit->interface->name);
3182 if (isis->debugs & DEBUG_PACKET_DUMP)
3183 zlog_dump_data (STREAM_DATA (circuit->snd_stream),
3184 stream_get_endp (circuit->snd_stream));
3188 retval = circuit->tx (circuit, lsp->level);
3189 if (retval != ISIS_OK)
3191 zlog_err ("ISIS-Upd (%s): Send L%d LSP on %s failed %s",
3192 circuit->area->area_tag, lsp->level,
3193 circuit->interface->name,
3194 (retval == ISIS_WARNING) ? "temporarily" : "permanently");
3199 || (retval == ISIS_OK && circuit->circ_type == CIRCUIT_T_BROADCAST)
3200 || (retval != ISIS_OK && retval != ISIS_WARNING))
3202 /* SRM flag will trigger retransmission. We will not retransmit if we
3203 * encountered a fatal error.
3204 * On success, they should only be cleared if it's a broadcast circuit.
3205 * On a P2P circuit, we will wait for the ack from the neighbor to clear
3208 ISIS_CLEAR_FLAG (lsp->SRMflags, circuit);
3215 ack_lsp (struct isis_link_state_hdr *hdr, struct isis_circuit *circuit,
3221 struct isis_fixed_hdr fixed_hdr;
3223 isis_circuit_stream(circuit, &circuit->snd_stream);
3225 // fill_llc_hdr (stream);
3226 if (level == IS_LEVEL_1)
3227 fill_fixed_hdr_andstream (&fixed_hdr, L1_PARTIAL_SEQ_NUM,
3228 circuit->snd_stream);
3230 fill_fixed_hdr_andstream (&fixed_hdr, L2_PARTIAL_SEQ_NUM,
3231 circuit->snd_stream);
3234 lenp = stream_get_endp (circuit->snd_stream);
3235 stream_putw (circuit->snd_stream, 0); /* PDU length */
3236 stream_put (circuit->snd_stream, isis->sysid, ISIS_SYS_ID_LEN);
3237 stream_putc (circuit->snd_stream, circuit->idx);
3238 stream_putc (circuit->snd_stream, 9); /* code */
3239 stream_putc (circuit->snd_stream, 16); /* len */
3241 stream_putw (circuit->snd_stream, ntohs (hdr->rem_lifetime));
3242 stream_put (circuit->snd_stream, hdr->lsp_id, ISIS_SYS_ID_LEN + 2);
3243 stream_putl (circuit->snd_stream, ntohl (hdr->seq_num));
3244 stream_putw (circuit->snd_stream, ntohs (hdr->checksum));
3246 length = (u_int16_t) stream_get_endp (circuit->snd_stream);
3247 /* Update PDU length */
3248 stream_putw_at (circuit->snd_stream, lenp, length);
3250 retval = circuit->tx (circuit, level);
3251 if (retval != ISIS_OK)
3252 zlog_err ("ISIS-Upd (%s): Send L%d LSP PSNP on %s failed",
3253 circuit->area->area_tag, level,
3254 circuit->interface->name);