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isis_pdu.c
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/*
* IS-IS Rout(e)ing protocol - isis_pdu.c
* PDU processing
*
* Copyright (C) 2001,2002 Sampo Saaristo
* Tampere University of Technology
* Institute of Communications Engineering
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public Licenseas published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <zebra.h>
#include "memory.h"
#include "thread.h"
#include "linklist.h"
#include "log.h"
#include "stream.h"
#include "vty.h"
#include "hash.h"
#include "prefix.h"
#include "if.h"
#include "checksum.h"
#include "md5.h"
#include "isisd/dict.h"
#include "isisd/include-netbsd/iso.h"
#include "isisd/isis_constants.h"
#include "isisd/isis_common.h"
#include "isisd/isis_flags.h"
#include "isisd/isis_adjacency.h"
#include "isisd/isis_circuit.h"
#include "isisd/isis_network.h"
#include "isisd/isis_misc.h"
#include "isisd/isis_dr.h"
#include "isisd/isis_tlv.h"
#include "isisd/isisd.h"
#include "isisd/isis_dynhn.h"
#include "isisd/isis_lsp.h"
#include "isisd/isis_pdu.h"
#include "isisd/iso_checksum.h"
#include "isisd/isis_csm.h"
#include "isisd/isis_events.h"
#define ISIS_MINIMUM_FIXED_HDR_LEN 15
#define ISIS_MIN_PDU_LEN 13 /* partial seqnum pdu with id_len=2 */
#ifndef PNBBY
#define PNBBY 8
#endif /* PNBBY */
/* Utility mask array. */
static u_char maskbit[] = {
0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff
};
/*
* HELPER FUNCS
*/
/*
* Compares two sets of area addresses
*/
static int
area_match (struct list *left, struct list *right)
{
struct area_addr *addr1, *addr2;
struct listnode *node1, *node2;
for (ALL_LIST_ELEMENTS_RO (left, node1, addr1))
{
for (ALL_LIST_ELEMENTS_RO (right, node2, addr2))
{
if (addr1->addr_len == addr2->addr_len &&
!memcmp (addr1->area_addr, addr2->area_addr, (int) addr1->addr_len))
return 1; /* match */
}
}
return 0; /* mismatch */
}
/*
* Check if ip2 is in the ip1's network (function like Prefix.h:prefix_match() )
* param ip1 the IS interface ip address structure
* param ip2 the IIH's ip address
* return 0 the IIH's IP is not in the IS's subnetwork
* 1 the IIH's IP is in the IS's subnetwork
*/
static int
ip_same_subnet (struct prefix_ipv4 *ip1, struct in_addr *ip2)
{
u_char *addr1, *addr2;
int shift, offset, offsetloop;
int len;
addr1 = (u_char *) & ip1->prefix.s_addr;
addr2 = (u_char *) & ip2->s_addr;
len = ip1->prefixlen;
shift = len % PNBBY;
offsetloop = offset = len / PNBBY;
while (offsetloop--)
if (addr1[offsetloop] != addr2[offsetloop])
return 0;
if (shift)
if (maskbit[shift] & (addr1[offset] ^ addr2[offset]))
return 0;
return 1; /* match */
}
/*
* Compares two set of ip addresses
* param left the local interface's ip addresses
* param right the iih interface's ip address
* return 0 no match;
* 1 match;
*/
static int
ip_match (struct list *left, struct list *right)
{
struct prefix_ipv4 *ip1;
struct in_addr *ip2;
struct listnode *node1, *node2;
if ((left == NULL) || (right == NULL))
return 0;
for (ALL_LIST_ELEMENTS_RO (left, node1, ip1))
{
for (ALL_LIST_ELEMENTS_RO (right, node2, ip2))
{
if (ip_same_subnet (ip1, ip2))
{
return 1; /* match */
}
}
}
return 0;
}
/*
* Checks whether we should accept a PDU of given level
*/
static int
accept_level (int level, int circuit_t)
{
int retval = ((circuit_t & level) == level); /* simple approach */
return retval;
}
/*
* Verify authentication information
* Support cleartext and HMAC MD5 authentication
*/
static int
authentication_check (struct isis_passwd *remote, struct isis_passwd *local,
struct stream *stream, uint32_t auth_tlv_offset)
{
unsigned char digest[ISIS_AUTH_MD5_SIZE];
/* Auth fail () - passwd type mismatch */
if (local->type != remote->type)
return ISIS_ERROR;
switch (local->type)
{
/* No authentication required */
case ISIS_PASSWD_TYPE_UNUSED:
break;
/* Cleartext (ISO 10589) */
case ISIS_PASSWD_TYPE_CLEARTXT:
/* Auth fail () - passwd len mismatch */
if (remote->len != local->len)
return ISIS_ERROR;
return memcmp (local->passwd, remote->passwd, local->len);
/* HMAC MD5 (RFC 3567) */
case ISIS_PASSWD_TYPE_HMAC_MD5:
/* Auth fail () - passwd len mismatch */
if (remote->len != ISIS_AUTH_MD5_SIZE)
return ISIS_ERROR;
/* Set the authentication value to 0 before the check */
memset (STREAM_DATA (stream) + auth_tlv_offset + 3, 0,
ISIS_AUTH_MD5_SIZE);
/* Compute the digest */
hmac_md5 (STREAM_DATA (stream), stream_get_endp (stream),
(unsigned char *) &(local->passwd), local->len,
(caddr_t) &digest);
/* Copy back the authentication value after the check */
memcpy (STREAM_DATA (stream) + auth_tlv_offset + 3,
remote->passwd, ISIS_AUTH_MD5_SIZE);
return memcmp (digest, remote->passwd, ISIS_AUTH_MD5_SIZE);
default:
zlog_err ("Unsupported authentication type");
return ISIS_ERROR;
}
/* Authentication pass when no authentication is configured */
return ISIS_OK;
}
static int
lsp_authentication_check (struct stream *stream, struct isis_area *area,
int level, struct isis_passwd *passwd)
{
struct isis_link_state_hdr *hdr;
uint32_t expected = 0, found = 0, auth_tlv_offset = 0;
uint16_t checksum, rem_lifetime, pdu_len;
struct tlvs tlvs;
int retval = ISIS_OK;
hdr = (struct isis_link_state_hdr *) (STREAM_PNT (stream));
pdu_len = ntohs (hdr->pdu_len);
expected |= TLVFLAG_AUTH_INFO;
auth_tlv_offset = stream_get_getp (stream) + ISIS_LSP_HDR_LEN;
retval = parse_tlvs (area->area_tag, STREAM_PNT (stream) + ISIS_LSP_HDR_LEN,
pdu_len - ISIS_FIXED_HDR_LEN - ISIS_LSP_HDR_LEN,
&expected, &found, &tlvs, &auth_tlv_offset);
if (retval != ISIS_OK)
{
zlog_err ("ISIS-Upd (%s): Parse failed L%d LSP %s, seq 0x%08x, "
"cksum 0x%04x, lifetime %us, len %u",
area->area_tag, level, rawlspid_print (hdr->lsp_id),
ntohl (hdr->seq_num), ntohs (hdr->checksum),
ntohs (hdr->rem_lifetime), pdu_len);
if ((isis->debugs & DEBUG_UPDATE_PACKETS) &&
(isis->debugs & DEBUG_PACKET_DUMP))
zlog_dump_data (STREAM_DATA (stream), stream_get_endp (stream));
return retval;
}
if (!(found & TLVFLAG_AUTH_INFO))
{
zlog_err ("No authentication tlv in LSP");
return ISIS_ERROR;
}
if (tlvs.auth_info.type != ISIS_PASSWD_TYPE_CLEARTXT &&
tlvs.auth_info.type != ISIS_PASSWD_TYPE_HMAC_MD5)
{
zlog_err ("Unknown authentication type in LSP");
return ISIS_ERROR;
}
/*
* RFC 5304 set checksum and remaining lifetime to zero before
* verification and reset to old values after verification.
*/
checksum = hdr->checksum;
rem_lifetime = hdr->rem_lifetime;
hdr->checksum = 0;
hdr->rem_lifetime = 0;
retval = authentication_check (&tlvs.auth_info, passwd, stream,
auth_tlv_offset);
hdr->checksum = checksum;
hdr->rem_lifetime = rem_lifetime;
return retval;
}
/*
* Processing helper functions
*/
static void
del_addr (void *val)
{
XFREE (MTYPE_ISIS_TMP, val);
}
static void
tlvs_to_adj_area_addrs (struct tlvs *tlvs, struct isis_adjacency *adj)
{
struct listnode *node;
struct area_addr *area_addr, *malloced;
if (adj->area_addrs)
{
adj->area_addrs->del = del_addr;
list_delete (adj->area_addrs);
}
adj->area_addrs = list_new ();
if (tlvs->area_addrs)
{
for (ALL_LIST_ELEMENTS_RO (tlvs->area_addrs, node, area_addr))
{
malloced = XMALLOC (MTYPE_ISIS_TMP, sizeof (struct area_addr));
memcpy (malloced, area_addr, sizeof (struct area_addr));
listnode_add (adj->area_addrs, malloced);
}
}
}
static int
tlvs_to_adj_nlpids (struct tlvs *tlvs, struct isis_adjacency *adj)
{
int i;
struct nlpids *tlv_nlpids;
if (tlvs->nlpids)
{
tlv_nlpids = tlvs->nlpids;
if (tlv_nlpids->count > array_size (adj->nlpids.nlpids))
return 1;
adj->nlpids.count = tlv_nlpids->count;
for (i = 0; i < tlv_nlpids->count; i++)
{
adj->nlpids.nlpids[i] = tlv_nlpids->nlpids[i];
}
}
return 0;
}
static void
tlvs_to_adj_ipv4_addrs (struct tlvs *tlvs, struct isis_adjacency *adj)
{
struct listnode *node;
struct in_addr *ipv4_addr, *malloced;
if (adj->ipv4_addrs)
{
adj->ipv4_addrs->del = del_addr;
list_delete (adj->ipv4_addrs);
}
adj->ipv4_addrs = list_new ();
if (tlvs->ipv4_addrs)
{
for (ALL_LIST_ELEMENTS_RO (tlvs->ipv4_addrs, node, ipv4_addr))
{
malloced = XMALLOC (MTYPE_ISIS_TMP, sizeof (struct in_addr));
memcpy (malloced, ipv4_addr, sizeof (struct in_addr));
listnode_add (adj->ipv4_addrs, malloced);
}
}
}
#ifdef HAVE_IPV6
static void
tlvs_to_adj_ipv6_addrs (struct tlvs *tlvs, struct isis_adjacency *adj)
{
struct listnode *node;
struct in6_addr *ipv6_addr, *malloced;
if (adj->ipv6_addrs)
{
adj->ipv6_addrs->del = del_addr;
list_delete (adj->ipv6_addrs);
}
adj->ipv6_addrs = list_new ();
if (tlvs->ipv6_addrs)
{
for (ALL_LIST_ELEMENTS_RO (tlvs->ipv6_addrs, node, ipv6_addr))
{
malloced = XMALLOC (MTYPE_ISIS_TMP, sizeof (struct in6_addr));
memcpy (malloced, ipv6_addr, sizeof (struct in6_addr));
listnode_add (adj->ipv6_addrs, malloced);
}
}
}
#endif /* HAVE_IPV6 */
/*
* RECEIVE SIDE
*/
/*
* Process P2P IIH
* ISO - 10589
* Section 8.2.5 - Receiving point-to-point IIH PDUs
*
*/
static int
process_p2p_hello (struct isis_circuit *circuit)
{
int retval = ISIS_OK;
struct isis_p2p_hello_hdr *hdr;
struct isis_adjacency *adj;
u_int32_t expected = 0, found = 0, auth_tlv_offset = 0;
uint16_t pdu_len;
struct tlvs tlvs;
int v4_usable = 0, v6_usable = 0;
if (isis->debugs & DEBUG_ADJ_PACKETS)
{
zlog_debug ("ISIS-Adj (%s): Rcvd P2P IIH on %s, cirType %s, cirID %u",
circuit->area->area_tag, circuit->interface->name,
circuit_t2string (circuit->is_type), circuit->circuit_id);
if (isis->debugs & DEBUG_PACKET_DUMP)
zlog_dump_data (STREAM_DATA (circuit->rcv_stream),
stream_get_endp (circuit->rcv_stream));
}
if (circuit->circ_type != CIRCUIT_T_P2P)
{
zlog_warn ("p2p hello on non p2p circuit");
return ISIS_WARNING;
}
if ((stream_get_endp (circuit->rcv_stream) -
stream_get_getp (circuit->rcv_stream)) < ISIS_P2PHELLO_HDRLEN)
{
zlog_warn ("Packet too short");
return ISIS_WARNING;
}
/* 8.2.5.1 PDU acceptance tests */
/* 8.2.5.1 a) external domain untrue */
/* FIXME: not useful at all? */
/* 8.2.5.1 b) ID Length mismatch */
/* checked at the handle_pdu */
/* 8.2.5.2 IIH PDU Processing */
/* 8.2.5.2 a) 1) Maximum Area Addresses */
/* Already checked, and can also be ommited */
/*
* Get the header
*/
hdr = (struct isis_p2p_hello_hdr *) STREAM_PNT (circuit->rcv_stream);
pdu_len = ntohs (hdr->pdu_len);
if (pdu_len < (ISIS_FIXED_HDR_LEN + ISIS_P2PHELLO_HDRLEN) ||
pdu_len > ISO_MTU(circuit) ||
pdu_len > stream_get_endp (circuit->rcv_stream))
{
zlog_warn ("ISIS-Adj (%s): Rcvd P2P IIH from (%s) with "
"invalid pdu length %d",
circuit->area->area_tag, circuit->interface->name, pdu_len);
return ISIS_WARNING;
}
/*
* Set the stream endp to PDU length, ignoring additional padding
* introduced by transport chips.
*/
if (pdu_len < stream_get_endp (circuit->rcv_stream))
stream_set_endp (circuit->rcv_stream, pdu_len);
stream_forward_getp (circuit->rcv_stream, ISIS_P2PHELLO_HDRLEN);
/*
* Lets get the TLVS now
*/
expected |= TLVFLAG_AREA_ADDRS;
expected |= TLVFLAG_AUTH_INFO;
expected |= TLVFLAG_NLPID;
expected |= TLVFLAG_IPV4_ADDR;
expected |= TLVFLAG_IPV6_ADDR;
auth_tlv_offset = stream_get_getp (circuit->rcv_stream);
retval = parse_tlvs (circuit->area->area_tag,
STREAM_PNT (circuit->rcv_stream),
pdu_len - ISIS_P2PHELLO_HDRLEN - ISIS_FIXED_HDR_LEN,
&expected, &found, &tlvs, &auth_tlv_offset);
if (retval > ISIS_WARNING)
{
zlog_warn ("parse_tlvs() failed");
free_tlvs (&tlvs);
return retval;
};
if (!(found & TLVFLAG_AREA_ADDRS))
{
zlog_warn ("No Area addresses TLV in P2P IS to IS hello");
free_tlvs (&tlvs);
return ISIS_WARNING;
}
if (!(found & TLVFLAG_NLPID))
{
zlog_warn ("No supported protocols TLV in P2P IS to IS hello");
free_tlvs (&tlvs);
return ISIS_WARNING;
}
/* 8.2.5.1 c) Authentication */
if (circuit->passwd.type)
{
if (!(found & TLVFLAG_AUTH_INFO) ||
authentication_check (&tlvs.auth_info, &circuit->passwd,
circuit->rcv_stream, auth_tlv_offset))
{
isis_event_auth_failure (circuit->area->area_tag,
"P2P hello authentication failure",
hdr->source_id);
free_tlvs (&tlvs);
return ISIS_OK;
}
}
/*
* check if it's own interface ip match iih ip addrs
*/
if (found & TLVFLAG_IPV4_ADDR)
{
if (ip_match (circuit->ip_addrs, tlvs.ipv4_addrs))
v4_usable = 1;
else
zlog_warn ("ISIS-Adj: IPv4 addresses present but no overlap "
"in P2P IIH from %s\n", circuit->interface->name);
}
#ifndef HAVE_IPV6
else /* !(found & TLVFLAG_IPV4_ADDR) */
zlog_warn ("ISIS-Adj: no IPv4 in P2P IIH from %s "
"(this isisd has no IPv6)\n", circuit->interface->name);
#else
if (found & TLVFLAG_IPV6_ADDR)
{
/* TBA: check that we have a linklocal ourselves? */
struct listnode *node;
struct in6_addr *ip;
for (ALL_LIST_ELEMENTS_RO (tlvs.ipv6_addrs, node, ip))
if (IN6_IS_ADDR_LINKLOCAL (ip))
{
v6_usable = 1;
break;
}
if (!v6_usable)
zlog_warn ("ISIS-Adj: IPv6 addresses present but no link-local "
"in P2P IIH from %s\n", circuit->interface->name);
}
if (!(found & (TLVFLAG_IPV4_ADDR | TLVFLAG_IPV6_ADDR)))
zlog_warn ("ISIS-Adj: neither IPv4 nor IPv6 addr in P2P IIH from %s\n",
circuit->interface->name);
#endif
if (!v6_usable && !v4_usable)
{
free_tlvs (&tlvs);
return ISIS_WARNING;
}
/*
* My interpertation of the ISO, if no adj exists we will create one for
* the circuit
*/
adj = circuit->u.p2p.neighbor;
if (!adj || adj->level != hdr->circuit_t)
{
if (!adj)
{
adj = isis_new_adj (hdr->source_id, NULL, hdr->circuit_t, circuit);
if (adj == NULL)
return ISIS_ERROR;
}
else
{
adj->level = hdr->circuit_t;
}
circuit->u.p2p.neighbor = adj;
isis_adj_state_change (adj, ISIS_ADJ_INITIALIZING, NULL);
adj->sys_type = ISIS_SYSTYPE_UNKNOWN;
}
/* 8.2.6 Monitoring point-to-point adjacencies */
adj->hold_time = ntohs (hdr->hold_time);
adj->last_upd = time (NULL);
/* we do this now because the adj may not survive till the end... */
tlvs_to_adj_area_addrs (&tlvs, adj);
/* which protocol are spoken ??? */
if (tlvs_to_adj_nlpids (&tlvs, adj))
{
free_tlvs (&tlvs);
return ISIS_WARNING;
}
/* we need to copy addresses to the adj */
if (found & TLVFLAG_IPV4_ADDR)
tlvs_to_adj_ipv4_addrs (&tlvs, adj);
#ifdef HAVE_IPV6
if (found & TLVFLAG_IPV6_ADDR)
tlvs_to_adj_ipv6_addrs (&tlvs, adj);
#endif /* HAVE_IPV6 */
/* lets take care of the expiry */
THREAD_TIMER_OFF (adj->t_expire);
THREAD_TIMER_ON (master, adj->t_expire, isis_adj_expire, adj,
(long) adj->hold_time);
/* 8.2.5.2 a) a match was detected */
if (area_match (circuit->area->area_addrs, tlvs.area_addrs))
{
/* 8.2.5.2 a) 2) If the system is L1 - table 5 */
if (circuit->area->is_type == IS_LEVEL_1)
{
switch (hdr->circuit_t)
{
case IS_LEVEL_1:
case IS_LEVEL_1_AND_2:
if (adj->adj_state != ISIS_ADJ_UP)
{
/* (4) adj state up */
isis_adj_state_change (adj, ISIS_ADJ_UP, NULL);
/* (5) adj usage level 1 */
adj->adj_usage = ISIS_ADJ_LEVEL1;
}
else if (adj->adj_usage == ISIS_ADJ_LEVEL1)
{
; /* accept */
}
break;
case IS_LEVEL_2:
if (adj->adj_state != ISIS_ADJ_UP)
{
/* (7) reject - wrong system type event */
zlog_warn ("wrongSystemType");
free_tlvs (&tlvs);
return ISIS_WARNING; /* Reject */
}
else if (adj->adj_usage == ISIS_ADJ_LEVEL1)
{
/* (6) down - wrong system */
isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Wrong System");
}
break;
}
}
/* 8.2.5.2 a) 3) If the system is L1L2 - table 6 */
if (circuit->area->is_type == IS_LEVEL_1_AND_2)
{
switch (hdr->circuit_t)
{
case IS_LEVEL_1:
if (adj->adj_state != ISIS_ADJ_UP)
{
/* (6) adj state up */
isis_adj_state_change (adj, ISIS_ADJ_UP, NULL);
/* (7) adj usage level 1 */
adj->adj_usage = ISIS_ADJ_LEVEL1;
}
else if (adj->adj_usage == ISIS_ADJ_LEVEL1)
{
; /* accept */
}
else if ((adj->adj_usage == ISIS_ADJ_LEVEL1AND2) ||
(adj->adj_usage == ISIS_ADJ_LEVEL2))
{
/* (8) down - wrong system */
isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Wrong System");
}
break;
case IS_LEVEL_2:
if (adj->adj_state != ISIS_ADJ_UP)
{
/* (6) adj state up */
isis_adj_state_change (adj, ISIS_ADJ_UP, NULL);
/* (9) adj usage level 2 */
adj->adj_usage = ISIS_ADJ_LEVEL2;
}
else if ((adj->adj_usage == ISIS_ADJ_LEVEL1) ||
(adj->adj_usage == ISIS_ADJ_LEVEL1AND2))
{
/* (8) down - wrong system */
isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Wrong System");
}
else if (adj->adj_usage == ISIS_ADJ_LEVEL2)
{
; /* Accept */
}
break;
case IS_LEVEL_1_AND_2:
if (adj->adj_state != ISIS_ADJ_UP)
{
/* (6) adj state up */
isis_adj_state_change (adj, ISIS_ADJ_UP, NULL);
/* (10) adj usage level 1 */
adj->adj_usage = ISIS_ADJ_LEVEL1AND2;
}
else if ((adj->adj_usage == ISIS_ADJ_LEVEL1) ||
(adj->adj_usage == ISIS_ADJ_LEVEL2))
{
/* (8) down - wrong system */
isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Wrong System");
}
else if (adj->adj_usage == ISIS_ADJ_LEVEL1AND2)
{
; /* Accept */
}
break;
}
}
/* 8.2.5.2 a) 4) If the system is L2 - table 7 */
if (circuit->area->is_type == IS_LEVEL_2)
{
switch (hdr->circuit_t)
{
case IS_LEVEL_1:
if (adj->adj_state != ISIS_ADJ_UP)
{
/* (5) reject - wrong system type event */
zlog_warn ("wrongSystemType");
free_tlvs (&tlvs);
return ISIS_WARNING; /* Reject */
}
else if ((adj->adj_usage == ISIS_ADJ_LEVEL1AND2) ||
(adj->adj_usage == ISIS_ADJ_LEVEL2))
{
/* (6) down - wrong system */
isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Wrong System");
}
break;
case IS_LEVEL_1_AND_2:
case IS_LEVEL_2:
if (adj->adj_state != ISIS_ADJ_UP)
{
/* (7) adj state up */
isis_adj_state_change (adj, ISIS_ADJ_UP, NULL);
/* (8) adj usage level 2 */
adj->adj_usage = ISIS_ADJ_LEVEL2;
}
else if (adj->adj_usage == ISIS_ADJ_LEVEL1AND2)
{
/* (6) down - wrong system */
isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Wrong System");
}
else if (adj->adj_usage == ISIS_ADJ_LEVEL2)
{
; /* Accept */
}
break;
}
}
}
/* 8.2.5.2 b) if no match was detected */
else if (listcount (circuit->area->area_addrs) > 0)
{
if (circuit->area->is_type == IS_LEVEL_1)
{
/* 8.2.5.2 b) 1) is_type L1 and adj is not up */
if (adj->adj_state != ISIS_ADJ_UP)
{
isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Area Mismatch");
/* 8.2.5.2 b) 2)is_type L1 and adj is up */
}
else
{
isis_adj_state_change (adj, ISIS_ADJ_DOWN,
"Down - Area Mismatch");
}
}
/* 8.2.5.2 b 3 If the system is L2 or L1L2 - table 8 */
else
{
switch (hdr->circuit_t)
{
case IS_LEVEL_1:
if (adj->adj_state != ISIS_ADJ_UP)
{
/* (6) reject - Area Mismatch event */
zlog_warn ("AreaMismatch");
free_tlvs (&tlvs);
return ISIS_WARNING; /* Reject */
}
else if (adj->adj_usage == ISIS_ADJ_LEVEL1)
{
/* (7) down - area mismatch */
isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Area Mismatch");
}
else if ((adj->adj_usage == ISIS_ADJ_LEVEL1AND2) ||
(adj->adj_usage == ISIS_ADJ_LEVEL2))
{
/* (7) down - wrong system */
isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Wrong System");
}
break;
case IS_LEVEL_1_AND_2:
case IS_LEVEL_2:
if (adj->adj_state != ISIS_ADJ_UP)
{
/* (8) adj state up */
isis_adj_state_change (adj, ISIS_ADJ_UP, NULL);
/* (9) adj usage level 2 */
adj->adj_usage = ISIS_ADJ_LEVEL2;
}
else if (adj->adj_usage == ISIS_ADJ_LEVEL1)
{
/* (7) down - wrong system */
isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Wrong System");
}
else if (adj->adj_usage == ISIS_ADJ_LEVEL1AND2)
{
if (hdr->circuit_t == IS_LEVEL_2)
{
/* (7) down - wrong system */
isis_adj_state_change (adj, ISIS_ADJ_DOWN,
"Wrong System");
}
else
{
/* (7) down - area mismatch */
isis_adj_state_change (adj, ISIS_ADJ_DOWN,
"Area Mismatch");
}
}
else if (adj->adj_usage == ISIS_ADJ_LEVEL2)
{
; /* Accept */
}
break;
}
}
}
else
{
/* down - area mismatch */
isis_adj_state_change (adj, ISIS_ADJ_DOWN, "Area Mismatch");
}
/* 8.2.5.2 c) if the action was up - comparing circuit IDs */
/* FIXME - Missing parts */
/* some of my own understanding of the ISO, why the heck does
* it not say what should I change the system_type to...
*/
switch (adj->adj_usage)
{
case ISIS_ADJ_LEVEL1:
adj->sys_type = ISIS_SYSTYPE_L1_IS;
break;
case ISIS_ADJ_LEVEL2:
adj->sys_type = ISIS_SYSTYPE_L2_IS;
break;
case ISIS_ADJ_LEVEL1AND2:
adj->sys_type = ISIS_SYSTYPE_L2_IS;
break;
case ISIS_ADJ_NONE:
adj->sys_type = ISIS_SYSTYPE_UNKNOWN;
break;
}
adj->circuit_t = hdr->circuit_t;
if (isis->debugs & DEBUG_ADJ_PACKETS)
{
zlog_debug ("ISIS-Adj (%s): Rcvd P2P IIH from (%s), cir type %s,"
" cir id %02d, length %d",
circuit->area->area_tag, circuit->interface->name,
circuit_t2string (circuit->is_type),
circuit->circuit_id, pdu_len);
}
free_tlvs (&tlvs);
return retval;
}
/*
* Process IS-IS LAN Level 1/2 Hello PDU
*/
static int
process_lan_hello (int level, struct isis_circuit *circuit, u_char * ssnpa)
{
int retval = ISIS_OK;
struct isis_lan_hello_hdr hdr;
struct isis_adjacency *adj;
u_int32_t expected = 0, found = 0, auth_tlv_offset = 0;
struct tlvs tlvs;
u_char *snpa;
struct listnode *node;
int v4_usable = 0, v6_usable = 0;
if (isis->debugs & DEBUG_ADJ_PACKETS)
{
zlog_debug ("ISIS-Adj (%s): Rcvd L%d LAN IIH on %s, cirType %s, "
"cirID %u",
circuit->area->area_tag, level, circuit->interface->name,
circuit_t2string (circuit->is_type), circuit->circuit_id);
if (isis->debugs & DEBUG_PACKET_DUMP)
zlog_dump_data (STREAM_DATA (circuit->rcv_stream),
stream_get_endp (circuit->rcv_stream));
}
if (circuit->circ_type != CIRCUIT_T_BROADCAST)
{
zlog_warn ("lan hello on non broadcast circuit");
return ISIS_WARNING;
}
if ((stream_get_endp (circuit->rcv_stream) -
stream_get_getp (circuit->rcv_stream)) < ISIS_LANHELLO_HDRLEN)
{
zlog_warn ("Packet too short");
return ISIS_WARNING;
}
if (circuit->ext_domain)
{
zlog_debug ("level %d LAN Hello received over circuit with "
"externalDomain = true", level);
return ISIS_WARNING;
}
if (!accept_level (level, circuit->is_type))
{
if (isis->debugs & DEBUG_ADJ_PACKETS)
{
zlog_debug ("ISIS-Adj (%s): Interface level mismatch, %s",
circuit->area->area_tag, circuit->interface->name);
}
return ISIS_WARNING;
}
#if 0
/* Cisco's debug message compatability */
if (!accept_level (level, circuit->area->is_type))
{
if (isis->debugs & DEBUG_ADJ_PACKETS)
{
zlog_debug ("ISIS-Adj (%s): is type mismatch",
circuit->area->area_tag);
}
return ISIS_WARNING;
}
#endif
/*
* Fill the header
*/
hdr.circuit_t = stream_getc (circuit->rcv_stream);
stream_get (hdr.source_id, circuit->rcv_stream, ISIS_SYS_ID_LEN);
hdr.hold_time = stream_getw (circuit->rcv_stream);
hdr.pdu_len = stream_getw (circuit->rcv_stream);
hdr.prio = stream_getc (circuit->rcv_stream);
stream_get (hdr.lan_id, circuit->rcv_stream, ISIS_SYS_ID_LEN + 1);
if (hdr.pdu_len < (ISIS_FIXED_HDR_LEN + ISIS_LANHELLO_HDRLEN) ||
hdr.pdu_len > ISO_MTU(circuit) ||
hdr.pdu_len > stream_get_endp (circuit->rcv_stream))
{
zlog_warn ("ISIS-Adj (%s): Rcvd LAN IIH from (%s) with "
"invalid pdu length %d",
circuit->area->area_tag, circuit->interface->name,
hdr.pdu_len);
return ISIS_WARNING;
}
/*
* Set the stream endp to PDU length, ignoring additional padding
* introduced by transport chips.
*/
if (hdr.pdu_len < stream_get_endp (circuit->rcv_stream))
stream_set_endp (circuit->rcv_stream, hdr.pdu_len);
if (hdr.circuit_t != IS_LEVEL_1 &&
hdr.circuit_t != IS_LEVEL_2 &&
hdr.circuit_t != IS_LEVEL_1_AND_2 &&
(level & hdr.circuit_t) == 0)
{
zlog_err ("Level %d LAN Hello with Circuit Type %d", level,
hdr.circuit_t);
return ISIS_ERROR;
}
/*
* Then get the tlvs
*/
expected |= TLVFLAG_AUTH_INFO;
expected |= TLVFLAG_AREA_ADDRS;
expected |= TLVFLAG_LAN_NEIGHS;
expected |= TLVFLAG_NLPID;
expected |= TLVFLAG_IPV4_ADDR;
expected |= TLVFLAG_IPV6_ADDR;
auth_tlv_offset = stream_get_getp (circuit->rcv_stream);
retval = parse_tlvs (circuit->area->area_tag,