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gerrit.opencord.org / quagga / a3936d04942795bb92f04fefd25957c327e31c20 / . / isisd / isis_lsp.c
blob: 4665490be20a3a472051933f3905dd9fc2e0d802 [file] [log] [blame]
/*
* IS-IS Rout(e)ing protocol - isis_lsp.c
* LSP processing
*
* Copyright (C) 2001,2002 Sampo Saaristo
* Tampere University of Technology
* Institute of Communications Engineering
* Copyright (C) 2013-2015 Christian Franke <chris@opensourcerouting.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as 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 "linklist.h"
#include "thread.h"
#include "vty.h"
#include "stream.h"
#include "memory.h"
#include "log.h"
#include "prefix.h"
#include "command.h"
#include "hash.h"
#include "if.h"
#include "checksum.h"
#include "md5.h"
#include "table.h"
#include "isisd/dict.h"
#include "isisd/isis_constants.h"
#include "isisd/isis_common.h"
#include "isisd/isis_flags.h"
#include "isisd/isis_circuit.h"
#include "isisd/isisd.h"
#include "isisd/isis_tlv.h"
#include "isisd/isis_lsp.h"
#include "isisd/isis_pdu.h"
#include "isisd/isis_dynhn.h"
#include "isisd/isis_misc.h"
#include "isisd/isis_csm.h"
#include "isisd/isis_adjacency.h"
#include "isisd/isis_spf.h"
#ifdef TOPOLOGY_GENERATE
#include "spgrid.h"
#endif
/* staticly assigned vars for printing purposes */
char lsp_bits_string[200]; /* FIXME: enough ? */
static int lsp_l1_refresh (struct thread *thread);
static int lsp_l2_refresh (struct thread *thread);
static int lsp_l1_refresh_pseudo (struct thread *thread);
static int lsp_l2_refresh_pseudo (struct thread *thread);
int
lsp_id_cmp (u_char * id1, u_char * id2)
{
return memcmp (id1, id2, ISIS_SYS_ID_LEN + 2);
}
dict_t *
lsp_db_init (void)
{
dict_t *dict;
dict = dict_create (DICTCOUNT_T_MAX, (dict_comp_t) lsp_id_cmp);
return dict;
}
struct isis_lsp *
lsp_search (u_char * id, dict_t * lspdb)
{
dnode_t *node;
#ifdef EXTREME_DEBUG
dnode_t *dn;
zlog_debug ("searching db");
for (dn = dict_first (lspdb); dn; dn = dict_next (lspdb, dn))
{
zlog_debug ("%s\t%pX", rawlspid_print ((u_char *) dnode_getkey (dn)),
dnode_get (dn));
}
#endif /* EXTREME DEBUG */
node = dict_lookup (lspdb, id);
if (node)
return (struct isis_lsp *) dnode_get (node);
return NULL;
}
static void
lsp_clear_data (struct isis_lsp *lsp)
{
if (!lsp)
return;
if (lsp->tlv_data.hostname)
isis_dynhn_remove (lsp->lsp_header->lsp_id);
if (lsp->own_lsp)
{
if (lsp->tlv_data.nlpids)
XFREE (MTYPE_ISIS_TLV, lsp->tlv_data.nlpids);
if (lsp->tlv_data.hostname)
XFREE (MTYPE_ISIS_TLV, lsp->tlv_data.hostname);
if (lsp->tlv_data.router_id)
XFREE (MTYPE_ISIS_TLV, lsp->tlv_data.router_id);
}
free_tlvs (&lsp->tlv_data);
}
static void
lsp_destroy (struct isis_lsp *lsp)
{
struct listnode *cnode, *lnode, *lnnode;
struct isis_lsp *lsp_in_list;
struct isis_circuit *circuit;
if (!lsp)
return;
if (lsp->area->circuit_list) {
for (ALL_LIST_ELEMENTS_RO (lsp->area->circuit_list, cnode, circuit))
{
if (circuit->lsp_queue == NULL)
continue;
for (ALL_LIST_ELEMENTS (circuit->lsp_queue, lnode, lnnode, lsp_in_list))
if (lsp_in_list == lsp)
list_delete_node(circuit->lsp_queue, lnode);
}
}
ISIS_FLAGS_CLEAR_ALL (lsp->SSNflags);
ISIS_FLAGS_CLEAR_ALL (lsp->SRMflags);
lsp_clear_data (lsp);
if (LSP_FRAGMENT (lsp->lsp_header->lsp_id) == 0 && lsp->lspu.frags)
{
list_delete (lsp->lspu.frags);
lsp->lspu.frags = NULL;
}
isis_spf_schedule (lsp->area, lsp->level);
#ifdef HAVE_IPV6
isis_spf_schedule6 (lsp->area, lsp->level);
#endif
if (lsp->pdu)
stream_free (lsp->pdu);
XFREE (MTYPE_ISIS_LSP, lsp);
}
void
lsp_db_destroy (dict_t * lspdb)
{
dnode_t *dnode, *next;
struct isis_lsp *lsp;
dnode = dict_first (lspdb);
while (dnode)
{
next = dict_next (lspdb, dnode);
lsp = dnode_get (dnode);
lsp_destroy (lsp);
dict_delete_free (lspdb, dnode);
dnode = next;
}
dict_free (lspdb);
return;
}
/*
* Remove all the frags belonging to the given lsp
*/
static void
lsp_remove_frags (struct list *frags, dict_t * lspdb)
{
dnode_t *dnode;
struct listnode *lnode, *lnnode;
struct isis_lsp *lsp;
for (ALL_LIST_ELEMENTS (frags, lnode, lnnode, lsp))
{
dnode = dict_lookup (lspdb, lsp->lsp_header->lsp_id);
lsp_destroy (lsp);
dnode_destroy (dict_delete (lspdb, dnode));
}
list_delete_all_node (frags);
return;
}
void
lsp_search_and_destroy (u_char * id, dict_t * lspdb)
{
dnode_t *node;
struct isis_lsp *lsp;
node = dict_lookup (lspdb, id);
if (node)
{
node = dict_delete (lspdb, node);
lsp = dnode_get (node);
/*
* If this is a zero lsp, remove all the frags now
*/
if (LSP_FRAGMENT (lsp->lsp_header->lsp_id) == 0)
{
if (lsp->lspu.frags)
lsp_remove_frags (lsp->lspu.frags, lspdb);
}
else
{
/*
* else just remove this frag, from the zero lsps' frag list
*/
if (lsp->lspu.zero_lsp && lsp->lspu.zero_lsp->lspu.frags)
listnode_delete (lsp->lspu.zero_lsp->lspu.frags, lsp);
}
lsp_destroy (lsp);
dnode_destroy (node);
}
}
/*
* Compares a LSP to given values
* Params are given in net order
*/
int
lsp_compare (char *areatag, struct isis_lsp *lsp, u_int32_t seq_num,
u_int16_t checksum, u_int16_t rem_lifetime)
{
/* no point in double ntohl on seqnum */
if (lsp->lsp_header->seq_num == seq_num &&
lsp->lsp_header->checksum == checksum &&
/*comparing with 0, no need to do ntohl */
((lsp->lsp_header->rem_lifetime == 0 && rem_lifetime == 0) ||
(lsp->lsp_header->rem_lifetime != 0 && rem_lifetime != 0)))
{
if (isis->debugs & DEBUG_SNP_PACKETS)
{
zlog_debug ("ISIS-Snp (%s): Compare LSP %s seq 0x%08x, cksum 0x%04x,"
" lifetime %us",
areatag,
rawlspid_print (lsp->lsp_header->lsp_id),
ntohl (lsp->lsp_header->seq_num),
ntohs (lsp->lsp_header->checksum),
ntohs (lsp->lsp_header->rem_lifetime));
zlog_debug ("ISIS-Snp (%s): is equal to ours seq 0x%08x,"
" cksum 0x%04x, lifetime %us",
areatag,
ntohl (seq_num), ntohs (checksum), ntohs (rem_lifetime));
}
return LSP_EQUAL;
}
/*
* LSPs with identical checksums should only be treated as newer if:
* a) The current LSP has a remaining lifetime != 0 and the other LSP has a
* remaining lifetime == 0. In this case, we should participate in the purge
* and should not treat the current LSP with remaining lifetime == 0 as older.
* b) The LSP has an incorrect checksum. In this case, we need to react as given
* in 7.3.16.2.
*/
if (ntohl (seq_num) > ntohl (lsp->lsp_header->seq_num)
|| (ntohl(seq_num) == ntohl(lsp->lsp_header->seq_num)
&& ( (lsp->lsp_header->rem_lifetime != 0
&& rem_lifetime == 0)
|| lsp->lsp_header->checksum != checksum)))
{
if (isis->debugs & DEBUG_SNP_PACKETS)
{
zlog_debug ("ISIS-Snp (%s): Compare LSP %s seq 0x%08x, cksum 0x%04x,"
" lifetime %us",
areatag,
rawlspid_print (lsp->lsp_header->lsp_id),
ntohl (seq_num), ntohs (checksum), ntohs (rem_lifetime));
zlog_debug ("ISIS-Snp (%s): is newer than ours seq 0x%08x, "
"cksum 0x%04x, lifetime %us",
areatag,
ntohl (lsp->lsp_header->seq_num),
ntohs (lsp->lsp_header->checksum),
ntohs (lsp->lsp_header->rem_lifetime));
}
return LSP_NEWER;
}
if (isis->debugs & DEBUG_SNP_PACKETS)
{
zlog_debug
("ISIS-Snp (%s): Compare LSP %s seq 0x%08x, cksum 0x%04x, lifetime %us",
areatag, rawlspid_print (lsp->lsp_header->lsp_id), ntohl (seq_num),
ntohs (checksum), ntohs (rem_lifetime));
zlog_debug ("ISIS-Snp (%s): is older than ours seq 0x%08x,"
" cksum 0x%04x, lifetime %us", areatag,
ntohl (lsp->lsp_header->seq_num),
ntohs (lsp->lsp_header->checksum),
ntohs (lsp->lsp_header->rem_lifetime));
}
return LSP_OLDER;
}
static void
lsp_auth_add (struct isis_lsp *lsp)
{
struct isis_passwd *passwd;
unsigned char hmac_md5_hash[ISIS_AUTH_MD5_SIZE];
/*
* Add the authentication info if its present
*/
(lsp->level == IS_LEVEL_1) ? (passwd = &lsp->area->area_passwd) :
(passwd = &lsp->area->domain_passwd);
switch (passwd->type)
{
/* Cleartext */
case ISIS_PASSWD_TYPE_CLEARTXT:
memcpy (&lsp->tlv_data.auth_info, passwd, sizeof (struct isis_passwd));
tlv_add_authinfo (passwd->type, passwd->len, passwd->passwd, lsp->pdu);
break;
/* HMAC MD5 */
case ISIS_PASSWD_TYPE_HMAC_MD5:
/* Remember where TLV is written so we can later
* overwrite the MD5 hash */
lsp->auth_tlv_offset = stream_get_endp (lsp->pdu);
memset(&hmac_md5_hash, 0, ISIS_AUTH_MD5_SIZE);
lsp->tlv_data.auth_info.type = ISIS_PASSWD_TYPE_HMAC_MD5;
lsp->tlv_data.auth_info.len = ISIS_AUTH_MD5_SIZE;
memcpy (&lsp->tlv_data.auth_info.passwd, hmac_md5_hash,
ISIS_AUTH_MD5_SIZE);
tlv_add_authinfo (passwd->type, ISIS_AUTH_MD5_SIZE, hmac_md5_hash,
lsp->pdu);
break;
default:
break;
}
}
static void
lsp_auth_update (struct isis_lsp *lsp)
{
struct isis_passwd *passwd;
unsigned char hmac_md5_hash[ISIS_AUTH_MD5_SIZE];
uint16_t checksum, rem_lifetime;
/* For HMAC MD5 we need to recompute the md5 hash and store it */
(lsp->level == IS_LEVEL_1) ? (passwd = &lsp->area->area_passwd) :
(passwd = &lsp->area->domain_passwd);
if (passwd->type != ISIS_PASSWD_TYPE_HMAC_MD5)
return;
/*
* In transient conditions (when net is configured where authentication
* config and lsp regenerate schedule is not yet run), there could be
* an own_lsp with auth_tlv_offset set to 0. In such a case, simply
* return, when lsp_regenerate is run, lsp will have auth tlv.
*/
if (lsp->auth_tlv_offset == 0)
return;
/*
* RFC 5304 set auth value, checksum and remaining lifetime to zero
* before computation and reset to old values after computation.
*/
checksum = lsp->lsp_header->checksum;
rem_lifetime = lsp->lsp_header->rem_lifetime;
lsp->lsp_header->checksum = 0;
lsp->lsp_header->rem_lifetime = 0;
/* Set the authentication value as well to zero */
memset (STREAM_DATA (lsp->pdu) + lsp->auth_tlv_offset + 3,
0, ISIS_AUTH_MD5_SIZE);
/* Compute autentication value */
hmac_md5 (STREAM_DATA (lsp->pdu), stream_get_endp(lsp->pdu),
(unsigned char *) &passwd->passwd, passwd->len,
(unsigned char *) &hmac_md5_hash);
/* Copy the hash into the stream */
memcpy (STREAM_DATA (lsp->pdu) + lsp->auth_tlv_offset + 3,
hmac_md5_hash, ISIS_AUTH_MD5_SIZE);
memcpy (&lsp->tlv_data.auth_info.passwd, hmac_md5_hash,
ISIS_AUTH_MD5_SIZE);
/* Copy back the checksum and remaining lifetime */
lsp->lsp_header->checksum = checksum;
lsp->lsp_header->rem_lifetime = rem_lifetime;
}
void
lsp_inc_seqnum (struct isis_lsp *lsp, u_int32_t seq_num)
{
u_int32_t newseq;
if (seq_num == 0 || ntohl (lsp->lsp_header->seq_num) > seq_num)
newseq = ntohl (lsp->lsp_header->seq_num) + 1;
else
newseq = seq_num + 1;
lsp->lsp_header->seq_num = htonl (newseq);
/* Recompute authentication and checksum information */
lsp_auth_update (lsp);
/* ISO 10589 - 7.3.11 Generation of the checksum
* The checksum shall be computed over all fields in the LSP which appear
* after the Remaining Lifetime field. This field (and those appearing
* before it) are excluded so that the LSP may be aged by systems without
* requiring recomputation.
*/
fletcher_checksum(STREAM_DATA (lsp->pdu) + 12,
ntohs (lsp->lsp_header->pdu_len) - 12, 12);
isis_spf_schedule (lsp->area, lsp->level);
#ifdef HAVE_IPV6
isis_spf_schedule6 (lsp->area, lsp->level);
#endif
return;
}
/*
* Genetates checksum for LSP and its frags
*/
static void
lsp_seqnum_update (struct isis_lsp *lsp0)
{
struct isis_lsp *lsp;
struct listnode *node;
lsp_inc_seqnum (lsp0, 0);
if (!lsp0->lspu.frags)
return;
for (ALL_LIST_ELEMENTS_RO (lsp0->lspu.frags, node, lsp))
lsp_inc_seqnum (lsp, 0);
return;
}
static u_int8_t
lsp_bits_generate (int level, int overload_bit, int attached_bit)
{
u_int8_t lsp_bits = 0;
if (level == IS_LEVEL_1)
lsp_bits = IS_LEVEL_1;
else
lsp_bits = IS_LEVEL_1_AND_2;
if (overload_bit)
lsp_bits |= overload_bit;
if (attached_bit)
lsp_bits |= attached_bit;
return lsp_bits;
}
static void
lsp_update_data (struct isis_lsp *lsp, struct stream *stream,
struct isis_area *area, int level)
{
uint32_t expected = 0, found;
int retval;
/* free the old lsp data */
lsp_clear_data (lsp);
/* copying only the relevant part of our stream */
if (lsp->pdu != NULL)
stream_free (lsp->pdu);
lsp->pdu = stream_dup (stream);
/* setting pointers to the correct place */
lsp->isis_header = (struct isis_fixed_hdr *) (STREAM_DATA (lsp->pdu));
lsp->lsp_header = (struct isis_link_state_hdr *) (STREAM_DATA (lsp->pdu) +
ISIS_FIXED_HDR_LEN);
lsp->area = area;
lsp->level = level;
lsp->age_out = ZERO_AGE_LIFETIME;
lsp->installed = time (NULL);
/*
* Get LSP data i.e. TLVs
*/
expected |= TLVFLAG_AUTH_INFO;
expected |= TLVFLAG_AREA_ADDRS;
expected |= TLVFLAG_IS_NEIGHS;
expected |= TLVFLAG_NLPID;
if (area->dynhostname)
expected |= TLVFLAG_DYN_HOSTNAME;
if (area->newmetric)
{
expected |= TLVFLAG_TE_IS_NEIGHS;
expected |= TLVFLAG_TE_IPV4_REACHABILITY;
expected |= TLVFLAG_TE_ROUTER_ID;
}
expected |= TLVFLAG_IPV4_ADDR;
expected |= TLVFLAG_IPV4_INT_REACHABILITY;
expected |= TLVFLAG_IPV4_EXT_REACHABILITY;
#ifdef HAVE_IPV6
expected |= TLVFLAG_IPV6_ADDR;
expected |= TLVFLAG_IPV6_REACHABILITY;
#endif /* HAVE_IPV6 */
retval = parse_tlvs (area->area_tag, STREAM_DATA (lsp->pdu) +
ISIS_FIXED_HDR_LEN + ISIS_LSP_HDR_LEN,
ntohs (lsp->lsp_header->pdu_len) -
ISIS_FIXED_HDR_LEN - ISIS_LSP_HDR_LEN,
&expected, &found, &lsp->tlv_data,
NULL);
if (retval != ISIS_OK)
{
zlog_warn ("Could not parse LSP");
return;
}
if ((found & TLVFLAG_DYN_HOSTNAME) && (area->dynhostname))
{
isis_dynhn_insert (lsp->lsp_header->lsp_id, lsp->tlv_data.hostname,
(lsp->lsp_header->lsp_bits & LSPBIT_IST) ==
IS_LEVEL_1_AND_2 ? IS_LEVEL_2 : IS_LEVEL_1);
}
return;
}
void
lsp_update (struct isis_lsp *lsp, struct stream *stream,
struct isis_area *area, int level)
{
dnode_t *dnode = NULL;
/* Remove old LSP from database. This is required since the
* lsp_update_data will free the lsp->pdu (which has the key, lsp_id)
* and will update it with the new data in the stream. */
dnode = dict_lookup (area->lspdb[level - 1], lsp->lsp_header->lsp_id);
if (dnode)
dnode_destroy (dict_delete (area->lspdb[level - 1], dnode));
/* rebuild the lsp data */
lsp_update_data (lsp, stream, area, level);
/* insert the lsp back into the database */
lsp_insert (lsp, area->lspdb[level - 1]);
}
/* creation of LSP directly from what we received */
struct isis_lsp *
lsp_new_from_stream_ptr (struct stream *stream,
u_int16_t pdu_len, struct isis_lsp *lsp0,
struct isis_area *area, int level)
{
struct isis_lsp *lsp;
lsp = XCALLOC (MTYPE_ISIS_LSP, sizeof (struct isis_lsp));
lsp_update_data (lsp, stream, area, level);
if (lsp0 == NULL)
{
/*
* zero lsp -> create the list for fragments
*/
lsp->lspu.frags = list_new ();
}
else
{
/*
* a fragment -> set the backpointer and add this to zero lsps frag list
*/
lsp->lspu.zero_lsp = lsp0;
listnode_add (lsp0->lspu.frags, lsp);
}
return lsp;
}
struct isis_lsp *
lsp_new(struct isis_area *area, u_char * lsp_id,
u_int16_t rem_lifetime, u_int32_t seq_num,
u_int8_t lsp_bits, u_int16_t checksum, int level)
{
struct isis_lsp *lsp;
lsp = XCALLOC (MTYPE_ISIS_LSP, sizeof (struct isis_lsp));
lsp->area = area;
lsp->pdu = stream_new(LLC_LEN + area->lsp_mtu);
if (LSP_FRAGMENT (lsp_id) == 0)
lsp->lspu.frags = list_new ();
lsp->isis_header = (struct isis_fixed_hdr *) (STREAM_DATA (lsp->pdu));
lsp->lsp_header = (struct isis_link_state_hdr *)
(STREAM_DATA (lsp->pdu) + ISIS_FIXED_HDR_LEN);
/* at first we fill the FIXED HEADER */
(level == IS_LEVEL_1) ? fill_fixed_hdr (lsp->isis_header, L1_LINK_STATE) :
fill_fixed_hdr (lsp->isis_header, L2_LINK_STATE);
/* now for the LSP HEADER */
/* Minimal LSP PDU size */
lsp->lsp_header->pdu_len = htons (ISIS_FIXED_HDR_LEN + ISIS_LSP_HDR_LEN);
memcpy (lsp->lsp_header->lsp_id, lsp_id, ISIS_SYS_ID_LEN + 2);
lsp->lsp_header->checksum = checksum; /* Provided in network order */
lsp->lsp_header->seq_num = htonl (seq_num);
lsp->lsp_header->rem_lifetime = htons (rem_lifetime);
lsp->lsp_header->lsp_bits = lsp_bits;
lsp->level = level;
lsp->age_out = ZERO_AGE_LIFETIME;
stream_forward_endp (lsp->pdu, ISIS_FIXED_HDR_LEN + ISIS_LSP_HDR_LEN);
if (isis->debugs & DEBUG_EVENTS)
zlog_debug ("New LSP with ID %s-%02x-%02x len %d seqnum %08x",
sysid_print (lsp_id), LSP_PSEUDO_ID (lsp->lsp_header->lsp_id),
LSP_FRAGMENT (lsp->lsp_header->lsp_id),
ntohl (lsp->lsp_header->pdu_len),
ntohl (lsp->lsp_header->seq_num));
return lsp;
}
void
lsp_insert (struct isis_lsp *lsp, dict_t * lspdb)
{
dict_alloc_insert (lspdb, lsp->lsp_header->lsp_id, lsp);
if (lsp->lsp_header->seq_num != 0)
{
isis_spf_schedule (lsp->area, lsp->level);
#ifdef HAVE_IPV6
isis_spf_schedule6 (lsp->area, lsp->level);
#endif
}
}
/*
* Build a list of LSPs with non-zero ht bounded by start and stop ids
*/
void
lsp_build_list_nonzero_ht (u_char * start_id, u_char * stop_id,
struct list *list, dict_t * lspdb)
{
dnode_t *first, *last, *curr;
first = dict_lower_bound (lspdb, start_id);
if (!first)
return;
last = dict_upper_bound (lspdb, stop_id);
curr = first;
if (((struct isis_lsp *) (curr->dict_data))->lsp_header->rem_lifetime)
listnode_add (list, first->dict_data);
while (curr)
{
curr = dict_next (lspdb, curr);
if (curr &&
((struct isis_lsp *) (curr->dict_data))->lsp_header->rem_lifetime)
listnode_add (list, curr->dict_data);
if (curr == last)
break;
}
return;
}
/*
* Build a list of num_lsps LSPs bounded by start_id and stop_id.
*/
void
lsp_build_list (u_char * start_id, u_char * stop_id, u_char num_lsps,
struct list *list, dict_t * lspdb)
{
u_char count;
dnode_t *first, *last, *curr;
first = dict_lower_bound (lspdb, start_id);
if (!first)
return;
last = dict_upper_bound (lspdb, stop_id);
curr = first;
listnode_add (list, first->dict_data);
count = 1;
while (curr)
{
curr = dict_next (lspdb, curr);
if (curr)
{
listnode_add (list, curr->dict_data);
count++;
}
if (count == num_lsps || curr == last)
break;
}
return;
}
/*
* Build a list of LSPs with SSN flag set for the given circuit
*/
void
lsp_build_list_ssn (struct isis_circuit *circuit, u_char num_lsps,
struct list *list, dict_t * lspdb)
{
dnode_t *dnode, *next;
struct isis_lsp *lsp;
u_char count = 0;
dnode = dict_first (lspdb);
while (dnode != NULL)
{
next = dict_next (lspdb, dnode);
lsp = dnode_get (dnode);
if (ISIS_CHECK_FLAG (lsp->SSNflags, circuit))
{
listnode_add (list, lsp);
++count;
}
if (count == num_lsps)
break;
dnode = next;
}
return;
}
static void
lsp_set_time (struct isis_lsp *lsp)
{
assert (lsp);
if (lsp->lsp_header->rem_lifetime == 0)
{
if (lsp->age_out > 0)
lsp->age_out--;
return;
}
lsp->lsp_header->rem_lifetime =
htons (ntohs (lsp->lsp_header->rem_lifetime) - 1);
}
static void
lspid_print (u_char * lsp_id, u_char * trg, char dynhost, char frag)
{
struct isis_dynhn *dyn = NULL;
u_char id[SYSID_STRLEN];
if (dynhost)
dyn = dynhn_find_by_id (lsp_id);
else
dyn = NULL;
if (dyn)
sprintf ((char *)id, "%.14s", dyn->name.name);
else if (!memcmp (isis->sysid, lsp_id, ISIS_SYS_ID_LEN) && dynhost)
sprintf ((char *)id, "%.14s", unix_hostname ());
else
memcpy (id, sysid_print (lsp_id), 15);
if (frag)
sprintf ((char *)trg, "%s.%02x-%02x", id, LSP_PSEUDO_ID (lsp_id),
LSP_FRAGMENT (lsp_id));
else
sprintf ((char *)trg, "%s.%02x", id, LSP_PSEUDO_ID (lsp_id));
}
/* Convert the lsp attribute bits to attribute string */
const char *
lsp_bits2string (u_char * lsp_bits)
{
char *pos = lsp_bits_string;
if (!*lsp_bits)
return " none";
/* we only focus on the default metric */
pos += sprintf (pos, "%d/",
ISIS_MASK_LSP_ATT_DEFAULT_BIT (*lsp_bits) ? 1 : 0);
pos += sprintf (pos, "%d/",
ISIS_MASK_LSP_PARTITION_BIT (*lsp_bits) ? 1 : 0);
pos += sprintf (pos, "%d", ISIS_MASK_LSP_OL_BIT (*lsp_bits) ? 1 : 0);
*(pos) = '\0';
return lsp_bits_string;
}
/* this function prints the lsp on show isis database */
void
lsp_print (struct isis_lsp *lsp, struct vty *vty, char dynhost)
{
u_char LSPid[255];
char age_out[8];
lspid_print (lsp->lsp_header->lsp_id, LSPid, dynhost, 1);
vty_out (vty, "%-21s%c ", LSPid, lsp->own_lsp ? '*' : ' ');
vty_out (vty, "%5u ", ntohs (lsp->lsp_header->pdu_len));
vty_out (vty, "0x%08x ", ntohl (lsp->lsp_header->seq_num));
vty_out (vty, "0x%04x ", ntohs (lsp->lsp_header->checksum));
if (ntohs (lsp->lsp_header->rem_lifetime) == 0)
{
snprintf (age_out, 8, "(%u)", lsp->age_out);
age_out[7] = '\0';
vty_out (vty, "%7s ", age_out);
}
else
vty_out (vty, " %5u ", ntohs (lsp->lsp_header->rem_lifetime));
vty_out (vty, "%s%s",
lsp_bits2string (&lsp->lsp_header->lsp_bits), VTY_NEWLINE);
}
void
lsp_print_detail (struct isis_lsp *lsp, struct vty *vty, char dynhost)
{
struct area_addr *area_addr;
int i;
struct listnode *lnode;
struct is_neigh *is_neigh;
struct te_is_neigh *te_is_neigh;
struct ipv4_reachability *ipv4_reach;
struct in_addr *ipv4_addr;
struct te_ipv4_reachability *te_ipv4_reach;
#ifdef HAVE_IPV6
struct ipv6_reachability *ipv6_reach;
struct in6_addr in6;
u_char buff[BUFSIZ];
#endif
u_char LSPid[255];
u_char hostname[255];
u_char ipv4_reach_prefix[20];
u_char ipv4_reach_mask[20];
u_char ipv4_address[20];
lspid_print (lsp->lsp_header->lsp_id, LSPid, dynhost, 1);
lsp_print (lsp, vty, dynhost);
/* for all area address */
if (lsp->tlv_data.area_addrs)
for (ALL_LIST_ELEMENTS_RO (lsp->tlv_data.area_addrs, lnode, area_addr))
{
vty_out (vty, " Area Address: %s%s",
isonet_print (area_addr->area_addr, area_addr->addr_len),
VTY_NEWLINE);
}
/* for the nlpid tlv */
if (lsp->tlv_data.nlpids)
{
for (i = 0; i < lsp->tlv_data.nlpids->count; i++)
{
switch (lsp->tlv_data.nlpids->nlpids[i])
{
case NLPID_IP:
case NLPID_IPV6:
vty_out (vty, " NLPID : 0x%X%s",
lsp->tlv_data.nlpids->nlpids[i], VTY_NEWLINE);
break;
default:
vty_out (vty, " NLPID : %s%s", "unknown", VTY_NEWLINE);
break;
}
}
}
/* for the hostname tlv */
if (lsp->tlv_data.hostname)
{
bzero (hostname, sizeof (hostname));
memcpy (hostname, lsp->tlv_data.hostname->name,
lsp->tlv_data.hostname->namelen);
vty_out (vty, " Hostname : %s%s", hostname, VTY_NEWLINE);
}
/* authentication tlv */
if (lsp->tlv_data.auth_info.type != ISIS_PASSWD_TYPE_UNUSED)
{
if (lsp->tlv_data.auth_info.type == ISIS_PASSWD_TYPE_HMAC_MD5)
vty_out (vty, " Auth type : md5%s", VTY_NEWLINE);
else if (lsp->tlv_data.auth_info.type == ISIS_PASSWD_TYPE_CLEARTXT)
vty_out (vty, " Auth type : clear text%s", VTY_NEWLINE);
}
/* TE router id */
if (lsp->tlv_data.router_id)
{
memcpy (ipv4_address, inet_ntoa (lsp->tlv_data.router_id->id),
sizeof (ipv4_address));
vty_out (vty, " Router ID : %s%s", ipv4_address, VTY_NEWLINE);
}
if (lsp->tlv_data.ipv4_addrs)
for (ALL_LIST_ELEMENTS_RO (lsp->tlv_data.ipv4_addrs, lnode, ipv4_addr))
{
memcpy (ipv4_address, inet_ntoa (*ipv4_addr), sizeof (ipv4_address));
vty_out (vty, " IPv4 Address: %s%s", ipv4_address, VTY_NEWLINE);
}
/* for the IS neighbor tlv */
if (lsp->tlv_data.is_neighs)
for (ALL_LIST_ELEMENTS_RO (lsp->tlv_data.is_neighs, lnode, is_neigh))
{
lspid_print (is_neigh->neigh_id, LSPid, dynhost, 0);
vty_out (vty, " Metric : %-8d IS : %s%s",
is_neigh->metrics.metric_default, LSPid, VTY_NEWLINE);
}
/* for the internal reachable tlv */
if (lsp->tlv_data.ipv4_int_reachs)
for (ALL_LIST_ELEMENTS_RO (lsp->tlv_data.ipv4_int_reachs, lnode,
ipv4_reach))
{
memcpy (ipv4_reach_prefix, inet_ntoa (ipv4_reach->prefix),
sizeof (ipv4_reach_prefix));
memcpy (ipv4_reach_mask, inet_ntoa (ipv4_reach->mask),
sizeof (ipv4_reach_mask));
vty_out (vty, " Metric : %-8d IPv4-Internal : %s %s%s",
ipv4_reach->metrics.metric_default, ipv4_reach_prefix,
ipv4_reach_mask, VTY_NEWLINE);
}
/* for the external reachable tlv */
if (lsp->tlv_data.ipv4_ext_reachs)
for (ALL_LIST_ELEMENTS_RO (lsp->tlv_data.ipv4_ext_reachs, lnode,
ipv4_reach))
{
memcpy (ipv4_reach_prefix, inet_ntoa (ipv4_reach->prefix),
sizeof (ipv4_reach_prefix));
memcpy (ipv4_reach_mask, inet_ntoa (ipv4_reach->mask),
sizeof (ipv4_reach_mask));
vty_out (vty, " Metric : %-8d IPv4-External : %s %s%s",
ipv4_reach->metrics.metric_default, ipv4_reach_prefix,
ipv4_reach_mask, VTY_NEWLINE);
}
/* IPv6 tlv */
#ifdef HAVE_IPV6
if (lsp->tlv_data.ipv6_reachs)
for (ALL_LIST_ELEMENTS_RO (lsp->tlv_data.ipv6_reachs, lnode, ipv6_reach))
{
memset (&in6, 0, sizeof (in6));
memcpy (in6.s6_addr, ipv6_reach->prefix,
PSIZE (ipv6_reach->prefix_len));
inet_ntop (AF_INET6, &in6, (char *)buff, BUFSIZ);
if ((ipv6_reach->control_info &
CTRL_INFO_DISTRIBUTION) == DISTRIBUTION_INTERNAL)
vty_out (vty, " Metric : %-8d IPv6-Internal : %s/%d%s",
ntohl (ipv6_reach->metric),
buff, ipv6_reach->prefix_len, VTY_NEWLINE);
else
vty_out (vty, " Metric : %-8d IPv6-External : %s/%d%s",
ntohl (ipv6_reach->metric),
buff, ipv6_reach->prefix_len, VTY_NEWLINE);
}
#endif
/* TE IS neighbor tlv */
if (lsp->tlv_data.te_is_neighs)
for (ALL_LIST_ELEMENTS_RO (lsp->tlv_data.te_is_neighs, lnode, te_is_neigh))
{
lspid_print (te_is_neigh->neigh_id, LSPid, dynhost, 0);
vty_out (vty, " Metric : %-8d IS-Extended : %s%s",
GET_TE_METRIC(te_is_neigh), LSPid, VTY_NEWLINE);
}
/* TE IPv4 tlv */
if (lsp->tlv_data.te_ipv4_reachs)
for (ALL_LIST_ELEMENTS_RO (lsp->tlv_data.te_ipv4_reachs, lnode,
te_ipv4_reach))
{
/* FIXME: There should be better way to output this stuff. */
vty_out (vty, " Metric : %-8d IPv4-Extended : %s/%d%s",
ntohl (te_ipv4_reach->te_metric),
inet_ntoa (newprefix2inaddr (&te_ipv4_reach->prefix_start,
te_ipv4_reach->control)),
te_ipv4_reach->control & 0x3F, VTY_NEWLINE);
}
vty_out (vty, "%s", VTY_NEWLINE);
return;
}
/* print all the lsps info in the local lspdb */
int
lsp_print_all (struct vty *vty, dict_t * lspdb, char detail, char dynhost)
{
dnode_t *node = dict_first (lspdb), *next;
int lsp_count = 0;
if (detail == ISIS_UI_LEVEL_BRIEF)
{
while (node != NULL)
{
/* I think it is unnecessary, so I comment it out */
/* dict_contains (lspdb, node); */
next = dict_next (lspdb, node);
lsp_print (dnode_get (node), vty, dynhost);
node = next;
lsp_count++;
}
}
else if (detail == ISIS_UI_LEVEL_DETAIL)
{
while (node != NULL)
{
next = dict_next (lspdb, node);
lsp_print_detail (dnode_get (node), vty, dynhost);
node = next;
lsp_count++;
}
}
return lsp_count;
}
#define FRAG_THOLD(S,T) \
((STREAM_SIZE(S)*T)/100)
/* stream*, area->lsp_frag_threshold, increment */
#define FRAG_NEEDED(S,T,I) \
(STREAM_SIZE(S)-STREAM_REMAIN(S)+(I) > FRAG_THOLD(S,T))
/* FIXME: It shouldn't be necessary to pass tlvsize here, TLVs can have
* variable length (TE TLVs, sub TLVs). */
static void
lsp_tlv_fit (struct isis_lsp *lsp, struct list **from, struct list **to,
int tlvsize, int frag_thold,
int tlv_build_func (struct list *, struct stream *))
{
int count, i;
/* can we fit all ? */
if (!FRAG_NEEDED (lsp->pdu, frag_thold, listcount (*from) * tlvsize + 2))
{
tlv_build_func (*from, lsp->pdu);
if (listcount (*to) != 0)
{
struct listnode *node, *nextnode;
void *elem;
for (ALL_LIST_ELEMENTS (*from, node, nextnode, elem))
{
listnode_add (*to, elem);
list_delete_node (*from, node);
}
}
else
{
list_free (*to);
*to = *from;
*from = NULL;
}
}
else if (!FRAG_NEEDED (lsp->pdu, frag_thold, tlvsize + 2))
{
/* fit all we can */
count = FRAG_THOLD (lsp->pdu, frag_thold) - 2 -
(STREAM_SIZE (lsp->pdu) - STREAM_REMAIN (lsp->pdu));
count = count / tlvsize;
if (count > (int)listcount (*from))
count = listcount (*from);
for (i = 0; i < count; i++)
{
listnode_add (*to, listgetdata (listhead (*from)));
listnode_delete (*from, listgetdata (listhead (*from)));
}
tlv_build_func (*to, lsp->pdu);
}
lsp->lsp_header->pdu_len = htons (stream_get_endp (lsp->pdu));
return;
}
static u_int16_t
lsp_rem_lifetime (struct isis_area *area, int level)
{
u_int16_t rem_lifetime;
/* Add jitter to configured LSP lifetime */
rem_lifetime = isis_jitter (area->max_lsp_lifetime[level - 1],
MAX_AGE_JITTER);
/* No jitter if the max refresh will be less than configure gen interval */
/* N.B. this calucation is acceptable since rem_lifetime is in [332,65535] at
* this point */
if (area->lsp_gen_interval[level - 1] > (rem_lifetime - 300))
rem_lifetime = area->max_lsp_lifetime[level - 1];
return rem_lifetime;
}
static u_int16_t
lsp_refresh_time (struct isis_lsp *lsp, u_int16_t rem_lifetime)
{
struct isis_area *area = lsp->area;
int level = lsp->level;
u_int16_t refresh_time;
/* Add jitter to LSP refresh time */
refresh_time = isis_jitter (area->lsp_refresh[level - 1],
MAX_LSP_GEN_JITTER);
/* RFC 4444 : make sure the refresh time is at least less than 300
* of the remaining lifetime and more than gen interval */
if (refresh_time <= area->lsp_gen_interval[level - 1] ||
refresh_time > (rem_lifetime - 300))
refresh_time = rem_lifetime - 300;
/* In cornercases, refresh_time might be <= lsp_gen_interval, however
* we accept this violation to satisfy refresh_time <= rem_lifetime - 300 */
return refresh_time;
}
static struct isis_lsp *
lsp_next_frag (u_char frag_num, struct isis_lsp *lsp0, struct isis_area *area,
int level)
{
struct isis_lsp *lsp;
u_char frag_id[ISIS_SYS_ID_LEN + 2];
memcpy (frag_id, lsp0->lsp_header->lsp_id, ISIS_SYS_ID_LEN + 1);
LSP_FRAGMENT (frag_id) = frag_num;
/* FIXME add authentication TLV for fragment LSPs */
lsp = lsp_search (frag_id, area->lspdb[level - 1]);
if (lsp)
{
/* Clear the TLVs */
lsp_clear_data (lsp);
return lsp;
}
lsp = lsp_new (area, frag_id, ntohs(lsp0->lsp_header->rem_lifetime), 0,
lsp_bits_generate (level, area->overload_bit,
area->attached_bit), 0, level);
lsp->area = area;
lsp->own_lsp = 1;
lsp_insert (lsp, area->lspdb[level - 1]);
listnode_add (lsp0->lspu.frags, lsp);
lsp->lspu.zero_lsp = lsp0;
return lsp;
}
static void
lsp_build_ext_reach_ipv4(struct isis_lsp *lsp, struct isis_area *area,
struct tlvs *tlv_data)
{
struct route_table *er_table;
struct route_node *rn;
struct prefix_ipv4 *ipv4;
struct isis_ext_info *info;
struct ipv4_reachability *ipreach;
struct te_ipv4_reachability *te_ipreach;
er_table = get_ext_reach(area, AF_INET, lsp->level);
if (!er_table)
return;
for (rn = route_top(er_table); rn; rn = route_next(rn))
{
if (!rn->info)
continue;
ipv4 = (struct prefix_ipv4*)&rn->p;
info = rn->info;
if (area->oldmetric)
{
if (tlv_data->ipv4_ext_reachs == NULL)
{
tlv_data->ipv4_ext_reachs = list_new();
tlv_data->ipv4_ext_reachs->del = free_tlv;
}
ipreach = XMALLOC(MTYPE_ISIS_TLV, sizeof(*ipreach));
ipreach->prefix.s_addr = ipv4->prefix.s_addr;
masklen2ip(ipv4->prefixlen, &ipreach->mask);
ipreach->prefix.s_addr &= ipreach->mask.s_addr;
if ((info->metric & 0x3f) != info->metric)
ipreach->metrics.metric_default = 0x3f;
else
ipreach->metrics.metric_default = info->metric;
ipreach->metrics.metric_expense = METRICS_UNSUPPORTED;
ipreach->metrics.metric_error = METRICS_UNSUPPORTED;
ipreach->metrics.metric_delay = METRICS_UNSUPPORTED;
listnode_add(tlv_data->ipv4_ext_reachs, ipreach);
}
if (area->newmetric)
{
if (tlv_data->te_ipv4_reachs == NULL)
{
tlv_data->te_ipv4_reachs = list_new();
tlv_data->te_ipv4_reachs->del = free_tlv;
}
te_ipreach =
XCALLOC(MTYPE_ISIS_TLV,
sizeof(*te_ipreach) - 1 + PSIZE(ipv4->prefixlen));
if (info->metric > MAX_WIDE_PATH_METRIC)
te_ipreach->te_metric = htonl(MAX_WIDE_PATH_METRIC);
else
te_ipreach->te_metric = htonl(info->metric);
te_ipreach->control = ipv4->prefixlen & 0x3f;
memcpy(&te_ipreach->prefix_start, &ipv4->prefix.s_addr,
PSIZE(ipv4->prefixlen));
listnode_add(tlv_data->te_ipv4_reachs, te_ipreach);
}
}
}
static void
lsp_build_ext_reach_ipv6(struct isis_lsp *lsp, struct isis_area *area,
struct tlvs *tlv_data)
{
struct route_table *er_table;
struct route_node *rn;
struct prefix_ipv6 *ipv6;
struct isis_ext_info *info;
struct ipv6_reachability *ip6reach;
er_table = get_ext_reach(area, AF_INET6, lsp->level);
if (!er_table)
return;
for (rn = route_top(er_table); rn; rn = route_next(rn))
{
if (!rn->info)
continue;
ipv6 = (struct prefix_ipv6*)&rn->p;
info = rn->info;
if (tlv_data->ipv6_reachs == NULL)
{
tlv_data->ipv6_reachs = list_new();
tlv_data->ipv6_reachs->del = free_tlv;
}
ip6reach = XCALLOC(MTYPE_ISIS_TLV, sizeof(*ip6reach));
if (info->metric > MAX_WIDE_PATH_METRIC)
ip6reach->metric = htonl(MAX_WIDE_PATH_METRIC);
else
ip6reach->metric = htonl(info->metric);
ip6reach->control_info = DISTRIBUTION_EXTERNAL;
ip6reach->prefix_len = ipv6->prefixlen;
memcpy(ip6reach->prefix, ipv6->prefix.s6_addr, sizeof(ip6reach->prefix));
listnode_add(tlv_data->ipv6_reachs, ip6reach);
}
}
static void
lsp_build_ext_reach (struct isis_lsp *lsp, struct isis_area *area,
struct tlvs *tlv_data)
{
lsp_build_ext_reach_ipv4(lsp, area, tlv_data);
lsp_build_ext_reach_ipv6(lsp, area, tlv_data);
}
/*
* Builds the LSP data part. This func creates a new frag whenever
* area->lsp_frag_threshold is exceeded.
*/
static void
lsp_build (struct isis_lsp *lsp, struct isis_area *area)
{
struct is_neigh *is_neigh;
struct te_is_neigh *te_is_neigh;
struct listnode *node, *ipnode;
int level = lsp->level;
struct isis_circuit *circuit;
struct prefix_ipv4 *ipv4;
struct ipv4_reachability *ipreach;
struct te_ipv4_reachability *te_ipreach;
struct isis_adjacency *nei;
#ifdef HAVE_IPV6
struct prefix_ipv6 *ipv6, ip6prefix;
struct ipv6_reachability *ip6reach;
#endif /* HAVE_IPV6 */
struct tlvs tlv_data;
struct isis_lsp *lsp0 = lsp;
struct in_addr *routerid;
uint32_t expected = 0, found = 0;
uint32_t metric;
u_char zero_id[ISIS_SYS_ID_LEN + 1];
int retval = ISIS_OK;
char buf[BUFSIZ];
lsp_debug("ISIS (%s): Constructing local system LSP for level %d", area->area_tag, level);
/*
* Building the zero lsp
*/
memset (zero_id, 0, ISIS_SYS_ID_LEN + 1);
/* Reset stream endp. Stream is always there and on every LSP refresh only
* TLV part of it is overwritten. So we must seek past header we will not
* touch. */
stream_reset (lsp->pdu);
stream_forward_endp (lsp->pdu, ISIS_FIXED_HDR_LEN + ISIS_LSP_HDR_LEN);
/*
* Add the authentication info if its present
*/
lsp_auth_add (lsp);
/*
* First add the tlvs related to area
*/
/* Area addresses */
if (lsp->tlv_data.area_addrs == NULL)
lsp->tlv_data.area_addrs = list_new ();
list_add_list (lsp->tlv_data.area_addrs, area->area_addrs);
if (listcount (lsp->tlv_data.area_addrs) > 0)
tlv_add_area_addrs (lsp->tlv_data.area_addrs, lsp->pdu);
/* Protocols Supported */
if (area->ip_circuits > 0
#ifdef HAVE_IPV6
|| area->ipv6_circuits > 0
#endif /* HAVE_IPV6 */
)
{
lsp->tlv_data.nlpids = XCALLOC (MTYPE_ISIS_TLV, sizeof (struct nlpids));
lsp->tlv_data.nlpids->count = 0;
if (area->ip_circuits > 0)
{
lsp_debug("ISIS (%s): Found IPv4 circuit, adding IPv4 to NLPIDs", area->area_tag);
lsp->tlv_data.nlpids->count++;
lsp->tlv_data.nlpids->nlpids[0] = NLPID_IP;
}
#ifdef HAVE_IPV6
if (area->ipv6_circuits > 0)
{
lsp_debug("ISIS (%s): Found IPv6 circuit, adding IPv6 to NLPIDs", area->area_tag);
lsp->tlv_data.nlpids->count++;
lsp->tlv_data.nlpids->nlpids[lsp->tlv_data.nlpids->count - 1] =
NLPID_IPV6;
}
#endif /* HAVE_IPV6 */
tlv_add_nlpid (lsp->tlv_data.nlpids, lsp->pdu);
}
/* Dynamic Hostname */
if (area->dynhostname)
{
const char *hostname = unix_hostname();
size_t hostname_len = strlen(hostname);
lsp->tlv_data.hostname = XMALLOC (MTYPE_ISIS_TLV,
sizeof (struct hostname));
strncpy((char *)lsp->tlv_data.hostname->name, hostname,
sizeof(lsp->tlv_data.hostname->name));
if (hostname_len <= MAX_TLV_LEN)
lsp->tlv_data.hostname->namelen = hostname_len;
else
lsp->tlv_data.hostname->namelen = MAX_TLV_LEN;
lsp_debug("ISIS (%s): Adding dynamic hostname '%.*s'", area->area_tag,
lsp->tlv_data.hostname->namelen, lsp->tlv_data.hostname->name);
tlv_add_dynamic_hostname (lsp->tlv_data.hostname, lsp->pdu);
}
else
{
lsp_debug("ISIS (%s): Not adding dynamic hostname (disabled)", area->area_tag);
}
/* IPv4 address and TE router ID TLVs. In case of the first one we don't
* follow "C" vendor, but "J" vendor behavior - one IPv4 address is put into
* LSP and this address is same as router id. */
if (isis->router_id != 0)
{
inet_ntop(AF_INET, &isis->router_id, buf, sizeof(buf));
lsp_debug("ISIS (%s): Adding router ID %s as IPv4 tlv.", area->area_tag, buf);
if (lsp->tlv_data.ipv4_addrs == NULL)
{
lsp->tlv_data.ipv4_addrs = list_new ();
lsp->tlv_data.ipv4_addrs->del = free_tlv;
}
routerid = XMALLOC (MTYPE_ISIS_TLV, sizeof (struct in_addr));
routerid->s_addr = isis->router_id;
listnode_add (lsp->tlv_data.ipv4_addrs, routerid);
tlv_add_in_addr (routerid, lsp->pdu, IPV4_ADDR);
/* Exactly same data is put into TE router ID TLV, but only if new style
* TLV's are in use. */
if (area->newmetric)
{
lsp_debug("ISIS (%s): Adding router ID also as TE router ID tlv.", area->area_tag);
lsp->tlv_data.router_id = XMALLOC (MTYPE_ISIS_TLV,
sizeof (struct in_addr));
lsp->tlv_data.router_id->id.s_addr = isis->router_id;
tlv_add_in_addr (&lsp->tlv_data.router_id->id, lsp->pdu,
TE_ROUTER_ID);
}
}
else
{
lsp_debug("ISIS (%s): Router ID is unset. Not adding tlv.", area->area_tag);
}
memset (&tlv_data, 0, sizeof (struct tlvs));
#ifdef TOPOLOGY_GENERATE
/* If topology exists (and we create topology for level 1 only), create
* (hardcoded) link to topology. */
if (area->topology && level == IS_LEVEL_1)
{
if (tlv_data.is_neighs == NULL)
{
tlv_data.is_neighs = list_new ();
tlv_data.is_neighs->del = free_tlv;
}
is_neigh = XCALLOC (MTYPE_ISIS_TLV, sizeof (struct is_neigh));
memcpy (&is_neigh->neigh_id, area->topology_baseis, ISIS_SYS_ID_LEN);
is_neigh->neigh_id[ISIS_SYS_ID_LEN - 1] = (1 & 0xFF);
is_neigh->neigh_id[ISIS_SYS_ID_LEN - 2] = ((1 >> 8) & 0xFF);
is_neigh->metrics.metric_default = 0x01;
is_neigh->metrics.metric_delay = METRICS_UNSUPPORTED;
is_neigh->metrics.metric_expense = METRICS_UNSUPPORTED;
is_neigh->metrics.metric_error = METRICS_UNSUPPORTED;
listnode_add (tlv_data.is_neighs, is_neigh);
}
#endif /* TOPOLOGY_GENERATE */
lsp_debug("ISIS (%s): Adding circuit specific information.", area->area_tag);
/*
* Then build lists of tlvs related to circuits
*/
for (ALL_LIST_ELEMENTS_RO (area->circuit_list, node, circuit))
{
if (!circuit->interface)
lsp_debug("ISIS (%s): Processing %s circuit %p with unknown interface",
area->area_tag, circuit_type2string(circuit->circ_type), circuit);
else
lsp_debug("ISIS (%s): Processing %s circuit %s",
area->area_tag, circuit_type2string(circuit->circ_type), circuit->interface->name);
if (circuit->state != C_STATE_UP)
{
lsp_debug("ISIS (%s): Circuit is not up, ignoring.", area->area_tag);
continue;
}
/*
* Add IPv4 internal reachability of this circuit
*/
if (circuit->ip_router && circuit->ip_addrs &&
circuit->ip_addrs->count > 0)
{
lsp_debug("ISIS (%s): Circuit has IPv4 active, adding respective TLVs.", area->area_tag);
if (area->oldmetric)
{
if (tlv_data.ipv4_int_reachs == NULL)
{
tlv_data.ipv4_int_reachs = list_new ();
tlv_data.ipv4_int_reachs->del = free_tlv;
}
for (ALL_LIST_ELEMENTS_RO (circuit->ip_addrs, ipnode, ipv4))
{
ipreach =
XMALLOC (MTYPE_ISIS_TLV, sizeof (struct ipv4_reachability));
ipreach->metrics = circuit->metrics[level - 1];
masklen2ip (ipv4->prefixlen, &ipreach->mask);
ipreach->prefix.s_addr = ((ipreach->mask.s_addr) &
(ipv4->prefix.s_addr));
inet_ntop(AF_INET, &ipreach->prefix.s_addr, buf, sizeof(buf));
lsp_debug("ISIS (%s): Adding old-style IP reachability for %s/%d",
area->area_tag, buf, ipv4->prefixlen);
listnode_add (tlv_data.ipv4_int_reachs, ipreach);
}
}
if (area->newmetric)
{
if (tlv_data.te_ipv4_reachs == NULL)
{
tlv_data.te_ipv4_reachs = list_new ();
tlv_data.te_ipv4_reachs->del = free_tlv;
}
for (ALL_LIST_ELEMENTS_RO (circuit->ip_addrs, ipnode, ipv4))
{
/* FIXME All this assumes that we have no sub TLVs. */
te_ipreach = XCALLOC (MTYPE_ISIS_TLV,
sizeof (struct te_ipv4_reachability) +
((ipv4->prefixlen + 7)/8) - 1);
if (area->oldmetric)
te_ipreach->te_metric = htonl (circuit->metrics[level - 1].metric_default);
else
te_ipreach->te_metric = htonl (circuit->te_metric[level - 1]);
te_ipreach->control = (ipv4->prefixlen & 0x3F);
memcpy (&te_ipreach->prefix_start, &ipv4->prefix.s_addr,
(ipv4->prefixlen + 7)/8);
inet_ntop(AF_INET, &ipv4->prefix.s_addr, buf, sizeof(buf));
lsp_debug("ISIS (%s): Adding te-style IP reachability for %s/%d",
area->area_tag, buf, ipv4->prefixlen);
listnode_add (tlv_data.te_ipv4_reachs, te_ipreach);
}
}
}
#ifdef HAVE_IPV6
/*
* Add IPv6 reachability of this circuit
*/
if (circuit->ipv6_router && circuit->ipv6_non_link &&
circuit->ipv6_non_link->count > 0)
{
if (tlv_data.ipv6_reachs == NULL)
{
tlv_data.ipv6_reachs = list_new ();
tlv_data.ipv6_reachs->del = free_tlv;
}
for (ALL_LIST_ELEMENTS_RO (circuit->ipv6_non_link, ipnode, ipv6))
{
ip6reach =
XCALLOC (MTYPE_ISIS_TLV, sizeof (struct ipv6_reachability));
if (area->oldmetric)
ip6reach->metric =
htonl (circuit->metrics[level - 1].metric_default);
else
ip6reach->metric = htonl (circuit->te_metric[level - 1]);
ip6reach->control_info = 0;
ip6reach->prefix_len = ipv6->prefixlen;
memcpy(&ip6prefix, ipv6, sizeof(ip6prefix));
apply_mask_ipv6(&ip6prefix);
inet_ntop(AF_INET6, &ip6prefix.prefix.s6_addr, buf, sizeof(buf));
lsp_debug("ISIS (%s): Adding IPv6 reachability for %s/%d",
area->area_tag, buf, ipv6->prefixlen);
memcpy (ip6reach->prefix, ip6prefix.prefix.s6_addr,
sizeof (ip6reach->prefix));
listnode_add (tlv_data.ipv6_reachs, ip6reach);
}
}
#endif /* HAVE_IPV6 */
switch (circuit->circ_type)
{
case CIRCUIT_T_BROADCAST:
if (level & circuit->is_type)
{
if (area->oldmetric)
{
if (tlv_data.is_neighs == NULL)
{
tlv_data.is_neighs = list_new ();
tlv_data.is_neighs->del = free_tlv;
}
is_neigh = XCALLOC (MTYPE_ISIS_TLV, sizeof (struct is_neigh));
if (level == IS_LEVEL_1)
memcpy (is_neigh->neigh_id,
circuit->u.bc.l1_desig_is, ISIS_SYS_ID_LEN + 1);
else
memcpy (is_neigh->neigh_id,
circuit->u.bc.l2_desig_is, ISIS_SYS_ID_LEN + 1);
is_neigh->metrics = circuit->metrics[level - 1];
if (!memcmp (is_neigh->neigh_id, zero_id,
ISIS_SYS_ID_LEN + 1))
{
XFREE (MTYPE_ISIS_TLV, is_neigh);
lsp_debug("ISIS (%s): No DIS for circuit, not adding old-style IS neighbor.",
area->area_tag);
}
else
{
listnode_add (tlv_data.is_neighs, is_neigh);
lsp_debug("ISIS (%s): Adding DIS %s.%02x as old-style neighbor",
area->area_tag, sysid_print(is_neigh->neigh_id),
LSP_PSEUDO_ID(is_neigh->neigh_id));
}
}
if (area->newmetric)
{
if (tlv_data.te_is_neighs == NULL)
{
tlv_data.te_is_neighs = list_new ();
tlv_data.te_is_neighs->del = free_tlv;
}
te_is_neigh = XCALLOC (MTYPE_ISIS_TLV,
sizeof (struct te_is_neigh));
if (level == IS_LEVEL_1)
memcpy (te_is_neigh->neigh_id,
circuit->u.bc.l1_desig_is, ISIS_SYS_ID_LEN + 1);
else
memcpy (te_is_neigh->neigh_id,
circuit->u.bc.l2_desig_is, ISIS_SYS_ID_LEN + 1);
if (area->oldmetric)
metric = circuit->metrics[level - 1].metric_default;
else
metric = circuit->te_metric[level - 1];
SET_TE_METRIC(te_is_neigh, metric);
if (!memcmp (te_is_neigh->neigh_id, zero_id,
ISIS_SYS_ID_LEN + 1))
{
XFREE (MTYPE_ISIS_TLV, te_is_neigh);
lsp_debug("ISIS (%s): No DIS for circuit, not adding te-style IS neighbor.",
area->area_tag);
}
else
{
listnode_add (tlv_data.te_is_neighs, te_is_neigh);
lsp_debug("ISIS (%s): Adding DIS %s.%02x as te-style neighbor",
area->area_tag, sysid_print(te_is_neigh->neigh_id),
LSP_PSEUDO_ID(te_is_neigh->neigh_id));
}
}
}
else
{
lsp_debug("ISIS (%s): Circuit is not active for current level. Not adding IS neighbors",
area->area_tag);
}
break;
case CIRCUIT_T_P2P:
nei = circuit->u.p2p.neighbor;
if (nei && (level & nei->circuit_t))
{
if (area->oldmetric)
{
if (tlv_data.is_neighs == NULL)
{
tlv_data.is_neighs = list_new ();
tlv_data.is_neighs->del = free_tlv;
}
is_neigh = XCALLOC (MTYPE_ISIS_TLV, sizeof (struct is_neigh));
memcpy (is_neigh->neigh_id, nei->sysid, ISIS_SYS_ID_LEN);
is_neigh->metrics = circuit->metrics[level - 1];
listnode_add (tlv_data.is_neighs, is_neigh);
lsp_debug("ISIS (%s): Adding old-style is reach for %s", area->area_tag,
sysid_print(is_neigh->neigh_id));
}
if (area->newmetric)
{
uint32_t metric;
if (tlv_data.te_is_neighs == NULL)
{
tlv_data.te_is_neighs = list_new ();
tlv_data.te_is_neighs->del = free_tlv;
}
te_is_neigh = XCALLOC (MTYPE_ISIS_TLV,
sizeof (struct te_is_neigh));
memcpy (te_is_neigh->neigh_id, nei->sysid, ISIS_SYS_ID_LEN);
metric = circuit->te_metric[level - 1];
SET_TE_METRIC(te_is_neigh, metric);
listnode_add (tlv_data.te_is_neighs, te_is_neigh);
lsp_debug("ISIS (%s): Adding te-style is reach for %s", area->area_tag,
sysid_print(te_is_neigh->neigh_id));
}
}
else
{
lsp_debug("ISIS (%s): No adjacency for given level on this circuit. Not adding IS neighbors",
area->area_tag);
}
break;
case CIRCUIT_T_LOOPBACK:
break;
default:
zlog_warn ("lsp_area_create: unknown circuit type");
}
}
lsp_build_ext_reach(lsp, area, &tlv_data);
lsp_debug("ISIS (%s): LSP construction is complete. Serializing...", area->area_tag);
while (tlv_data.ipv4_int_reachs && listcount (tlv_data.ipv4_int_reachs))
{
if (lsp->tlv_data.ipv4_int_reachs == NULL)
lsp->tlv_data.ipv4_int_reachs = list_new ();
lsp_tlv_fit (lsp, &tlv_data.ipv4_int_reachs,
&lsp->tlv_data.ipv4_int_reachs,
IPV4_REACH_LEN, area->lsp_frag_threshold,
tlv_add_ipv4_int_reachs);
if (tlv_data.ipv4_int_reachs && listcount (tlv_data.ipv4_int_reachs))
lsp = lsp_next_frag (LSP_FRAGMENT (lsp->lsp_header->lsp_id) + 1,
lsp0, area, level);
}
while (tlv_data.ipv4_ext_reachs && listcount (tlv_data.ipv4_ext_reachs))
{
if (lsp->tlv_data.ipv4_ext_reachs == NULL)
lsp->tlv_data.ipv4_ext_reachs = list_new ();
lsp_tlv_fit (lsp, &tlv_data.ipv4_ext_reachs,
&lsp->tlv_data.ipv4_ext_reachs,
IPV4_REACH_LEN, area->lsp_frag_threshold,
tlv_add_ipv4_ext_reachs);
if (tlv_data.ipv4_ext_reachs && listcount (tlv_data.ipv4_ext_reachs))
lsp = lsp_next_frag (LSP_FRAGMENT (lsp->lsp_header->lsp_id) + 1,
lsp0, area, level);
}
/* FIXME: We pass maximum te_ipv4_reachability length to the lsp_tlv_fit()
* for now. lsp_tlv_fit() needs to be fixed to deal with variable length
* TLVs (sub TLVs!). */
while (tlv_data.te_ipv4_reachs && listcount (tlv_data.te_ipv4_reachs))
{
if (lsp->tlv_data.te_ipv4_reachs == NULL)
lsp->tlv_data.te_ipv4_reachs = list_new ();
lsp_tlv_fit (lsp, &tlv_data.te_ipv4_reachs,
&lsp->tlv_data.te_ipv4_reachs,
TE_IPV4_REACH_LEN, area->lsp_frag_threshold,
tlv_add_te_ipv4_reachs);
if (tlv_data.te_ipv4_reachs && listcount (tlv_data.te_ipv4_reachs))
lsp = lsp_next_frag (LSP_FRAGMENT (lsp->lsp_header->lsp_id) + 1,
lsp0, area, level);
}
#ifdef HAVE_IPV6
while (tlv_data.ipv6_reachs && listcount (tlv_data.ipv6_reachs))
{
if (lsp->tlv_data.ipv6_reachs == NULL)
lsp->tlv_data.ipv6_reachs = list_new ();
lsp_tlv_fit (lsp, &tlv_data.ipv6_reachs,
&lsp->tlv_data.ipv6_reachs,
IPV6_REACH_LEN, area->lsp_frag_threshold,
tlv_add_ipv6_reachs);
if (tlv_data.ipv6_reachs && listcount (tlv_data.ipv6_reachs))
lsp = lsp_next_frag (LSP_FRAGMENT (lsp->lsp_header->lsp_id) + 1,
lsp0, area, level);
}
#endif /* HAVE_IPV6 */
while (tlv_data.is_neighs && listcount (tlv_data.is_neighs))
{
if (lsp->tlv_data.is_neighs == NULL)
lsp->tlv_data.is_neighs = list_new ();
lsp_tlv_fit (lsp, &tlv_data.is_neighs,
&lsp->tlv_data.is_neighs,
IS_NEIGHBOURS_LEN, area->lsp_frag_threshold,
tlv_add_is_neighs);
if (tlv_data.is_neighs && listcount (tlv_data.is_neighs))
lsp = lsp_next_frag (LSP_FRAGMENT (lsp->lsp_header->lsp_id) + 1,
lsp0, area, level);
}
while (tlv_data.te_is_neighs && listcount (tlv_data.te_is_neighs))
{
if (lsp->tlv_data.te_is_neighs == NULL)
lsp->tlv_data.te_is_neighs = list_new ();
lsp_tlv_fit (lsp, &tlv_data.te_is_neighs, &lsp->tlv_data.te_is_neighs,
IS_NEIGHBOURS_LEN, area->lsp_frag_threshold,
tlv_add_te_is_neighs);
if (tlv_data.te_is_neighs && listcount (tlv_data.te_is_neighs))
lsp = lsp_next_frag (LSP_FRAGMENT (lsp->lsp_header->lsp_id) + 1,
lsp0, area, level);
}
lsp->lsp_header->pdu_len = htons (stream_get_endp (lsp->pdu));
free_tlvs (&tlv_data);
/* Validate the LSP */
retval = parse_tlvs (area->area_tag, STREAM_DATA (lsp->pdu) +
ISIS_FIXED_HDR_LEN + ISIS_LSP_HDR_LEN,
stream_get_endp (lsp->pdu) -
ISIS_FIXED_HDR_LEN - ISIS_LSP_HDR_LEN,
&expected, &found, &tlv_data, NULL);
assert (retval == ISIS_OK);
return;
}
/*
* 7.3.7 and 7.3.9 Generation on non-pseudonode LSPs
*/
int
lsp_generate (struct isis_area *area, int level)
{
struct isis_lsp *oldlsp, *newlsp;
u_int32_t seq_num = 0;
u_char lspid[ISIS_SYS_ID_LEN + 2];
u_int16_t rem_lifetime, refresh_time;
if ((area == NULL) || (area->is_type & level) != level)
return ISIS_ERROR;
memset (&lspid, 0, ISIS_SYS_ID_LEN + 2);
memcpy (&lspid, isis->sysid, ISIS_SYS_ID_LEN);
/* only builds the lsp if the area shares the level */
oldlsp = lsp_search (lspid, area->lspdb[level - 1]);
if (oldlsp)
{
/* FIXME: we should actually initiate a purge */
seq_num = ntohl (oldlsp->lsp_header->seq_num);
lsp_search_and_destroy (oldlsp->lsp_header->lsp_id,
area->lspdb[level - 1]);
}
rem_lifetime = lsp_rem_lifetime (area, level);
newlsp = lsp_new (area, lspid, rem_lifetime, seq_num,
area->is_type | area->overload_bit | area->attached_bit,
0, level);
newlsp->area = area;
newlsp->own_lsp = 1;
lsp_insert (newlsp, area->lspdb[level - 1]);
/* build_lsp_data (newlsp, area); */
lsp_build (newlsp, area);
/* time to calculate our checksum */
lsp_seqnum_update (newlsp);
newlsp->last_generated = time(NULL);
lsp_set_all_srmflags (newlsp);
refresh_time = lsp_refresh_time (newlsp, rem_lifetime);
THREAD_TIMER_OFF (area->t_lsp_refresh[level - 1]);
area->lsp_regenerate_pending[level - 1] = 0;
if (level == IS_LEVEL_1)
THREAD_TIMER_ON (master, area->t_lsp_refresh[level - 1],
lsp_l1_refresh, area, refresh_time);
else if (level == IS_LEVEL_2)
THREAD_TIMER_ON (master, area->t_lsp_refresh[level - 1],
lsp_l2_refresh, area, refresh_time);
if (isis->debugs & DEBUG_UPDATE_PACKETS)
{
zlog_debug ("ISIS-Upd (%s): Building L%d LSP %s, len %d, "
"seq 0x%08x, cksum 0x%04x, lifetime %us refresh %us",
area->area_tag, level,
rawlspid_print (newlsp->lsp_header->lsp_id),
ntohl (newlsp->lsp_header->pdu_len),
ntohl (newlsp->lsp_header->seq_num),
ntohs (newlsp->lsp_header->checksum),
ntohs (newlsp->lsp_header->rem_lifetime),
refresh_time);
}
sched_debug("ISIS (%s): Built L%d LSP. Set triggered regenerate to non-pending.",
area->area_tag, level);
return ISIS_OK;
}
/*
* Search own LSPs, update holding time and set SRM
*/
static int
lsp_regenerate (struct isis_area *area, int level)
{
dict_t *lspdb;
struct isis_lsp *lsp, *frag;
struct listnode *node;
u_char lspid[ISIS_SYS_ID_LEN + 2];
u_int16_t rem_lifetime, refresh_time;
if ((area == NULL) || (area->is_type & level) != level)
return ISIS_ERROR;
lspdb = area->lspdb[level - 1];
memset (lspid, 0, ISIS_SYS_ID_LEN + 2);
memcpy (lspid, isis->sysid, ISIS_SYS_ID_LEN);
lsp = lsp_search (lspid, lspdb);
if (!lsp)
{
zlog_err ("ISIS-Upd (%s): lsp_regenerate: no L%d LSP found!",
area->area_tag, level);
return ISIS_ERROR;
}
lsp_clear_data (lsp);
lsp_build (lsp, area);
lsp->lsp_header->lsp_bits = lsp_bits_generate (level, area->overload_bit,
area->attached_bit);
rem_lifetime = lsp_rem_lifetime (area, level);
lsp->lsp_header->rem_lifetime = htons (rem_lifetime);
lsp_seqnum_update (lsp);
lsp->last_generated = time (NULL);
lsp_set_all_srmflags (lsp);
for (ALL_LIST_ELEMENTS_RO (lsp->lspu.frags, node, frag))
{
frag->lsp_header->lsp_bits = lsp_bits_generate (level,
area->overload_bit,
area->attached_bit);
/* Set the lifetime values of all the fragments to the same value,
* so that no fragment expires before the lsp is refreshed.
*/
frag->lsp_header->rem_lifetime = htons (rem_lifetime);
lsp_set_all_srmflags (frag);
}
refresh_time = lsp_refresh_time (lsp, rem_lifetime);
if (level == IS_LEVEL_1)
THREAD_TIMER_ON (master, area->t_lsp_refresh[level - 1],
lsp_l1_refresh, area, refresh_time);
else if (level == IS_LEVEL_2)
THREAD_TIMER_ON (master, area->t_lsp_refresh[level - 1],
lsp_l2_refresh, area, refresh_time);
area->lsp_regenerate_pending[level - 1] = 0;
if (isis->debugs & DEBUG_UPDATE_PACKETS)
{
zlog_debug ("ISIS-Upd (%s): Refreshing our L%d LSP %s, len %d, "
"seq 0x%08x, cksum 0x%04x, lifetime %us refresh %us",
area->area_tag, level,
rawlspid_print (lsp->lsp_header->lsp_id),
ntohl (lsp->lsp_header->pdu_len),
ntohl (lsp->lsp_header->seq_num),
ntohs (lsp->lsp_header->checksum),
ntohs (lsp->lsp_header->rem_lifetime),
refresh_time);
}
sched_debug("ISIS (%s): Rebuilt L%d LSP. Set triggered regenerate to non-pending.",
area->area_tag, level);
return ISIS_OK;
}
/*
* Something has changed or periodic refresh -> regenerate LSP
*/
static int
lsp_l1_refresh (struct thread *thread)
{
struct isis_area *area;
area = THREAD_ARG (thread);
assert (area);
area->t_lsp_refresh[0] = NULL;
area->lsp_regenerate_pending[0] = 0;
if ((area->is_type & IS_LEVEL_1) == 0)
return ISIS_ERROR;
sched_debug("ISIS (%s): LSP L1 refresh timer expired. Refreshing LSP...", area->area_tag);
return lsp_regenerate (area, IS_LEVEL_1);
}
static int
lsp_l2_refresh (struct thread *thread)
{
struct isis_area *area;
area = THREAD_ARG (thread);
assert (area);
area->t_lsp_refresh[1] = NULL;
area->lsp_regenerate_pending[1] = 0;
if ((area->is_type & IS_LEVEL_2) == 0)
return ISIS_ERROR;
sched_debug("ISIS (%s): LSP L2 refresh timer expired. Refreshing LSP...", area->area_tag);
return lsp_regenerate (area, IS_LEVEL_2);
}
int
lsp_regenerate_schedule (struct isis_area *area, int level, int all_pseudo)
{
struct isis_lsp *lsp;
u_char id[ISIS_SYS_ID_LEN + 2];
time_t now, diff;
long timeout;
struct listnode *cnode;
struct isis_circuit *circuit;
int lvl;
if (area == NULL)
return ISIS_ERROR;
sched_debug("ISIS (%s): Scheduling regeneration of %s LSPs, %sincluding PSNs",
area->area_tag, circuit_t2string(level), all_pseudo ? "" : "not ");
memcpy (id, isis->sysid, ISIS_SYS_ID_LEN);
LSP_PSEUDO_ID (id) = LSP_FRAGMENT (id) = 0;
now = time (NULL);
for (lvl = IS_LEVEL_1; lvl <= IS_LEVEL_2; lvl++)
{
if (!((level & lvl) && (area->is_type & lvl)))
continue;
sched_debug("ISIS (%s): Checking whether L%d needs to be scheduled",
area->area_tag, lvl);
if (area->lsp_regenerate_pending[lvl - 1])
{
struct timeval remain = thread_timer_remain(area->t_lsp_refresh[lvl - 1]);
sched_debug("ISIS (%s): Regeneration is already pending, nothing todo."
" (Due in %lld.%03lld seconds)", area->area_tag,
(long long)remain.tv_sec, (long long)remain.tv_usec / 1000);
continue;
}
lsp = lsp_search (id, area->lspdb[lvl - 1]);
if (!lsp)
{
sched_debug("ISIS (%s): We do not have any LSPs to regenerate, nothing todo.",
area->area_tag);
continue;
}
/*
* Throttle avoidance
*/
sched_debug("ISIS (%s): Will schedule regen timer. Last run was: %lld, Now is: %lld",
area->area_tag, (long long)lsp->last_generated, (long long)now);
THREAD_TIMER_OFF (area->t_lsp_refresh[lvl - 1]);
diff = now - lsp->last_generated;
if (diff < area->lsp_gen_interval[lvl - 1])
{
timeout = 1000 * (area->lsp_gen_interval[lvl - 1] - diff);
sched_debug("ISIS (%s): Scheduling in %ld ms to match configured lsp_gen_interval",
area->area_tag, timeout);
}
else
{
/*
* lsps are not regenerated if lsp_regenerate function is called
* directly. However if the lsp_regenerate call is queued for
* later execution it works.
*/
timeout = 100;
sched_debug("ISIS (%s): Last generation was more than lsp_gen_interval ago."
" Scheduling for execution in %ld ms.", area->area_tag, timeout);
}
area->lsp_regenerate_pending[lvl - 1] = 1;
if (lvl == IS_LEVEL_1)
{
THREAD_TIMER_MSEC_ON(master, area->t_lsp_refresh[lvl - 1],
lsp_l1_refresh, area, timeout);
}
else if (lvl == IS_LEVEL_2)
{
THREAD_TIMER_MSEC_ON(master, area->t_lsp_refresh[lvl - 1],
lsp_l2_refresh, area, timeout);
}
}
if (all_pseudo)
{
for (ALL_LIST_ELEMENTS_RO (area->circuit_list, cnode, circuit))
lsp_regenerate_schedule_pseudo (circuit, level);
}
return ISIS_OK;
}
/*
* Funcs for pseudonode LSPs
*/
/*
* 7.3.8 and 7.3.10 Generation of level 1 and 2 pseudonode LSPs
*/
static void
lsp_build_pseudo (struct isis_lsp *lsp, struct isis_circuit *circuit,
int level)
{
struct isis_adjacency *adj;
struct is_neigh *is_neigh;
struct te_is_neigh *te_is_neigh;
struct es_neigh *es_neigh;
struct list *adj_list;
struct listnode *node;
struct isis_area *area = circuit->area;
lsp_debug("ISIS (%s): Constructing pseudo LSP %s for interface %s level %d",
area->area_tag, rawlspid_print(lsp->lsp_header->lsp_id),
circuit->interface->name, level);
lsp->level = level;
/* RFC3787 section 4 SHOULD not set overload bit in pseudo LSPs */
lsp->lsp_header->lsp_bits = lsp_bits_generate (level, 0,
circuit->area->attached_bit);
/*
* add self to IS neighbours
*/
if (circuit->area->oldmetric)
{
if (lsp->tlv_data.is_neighs == NULL)
{
lsp->tlv_data.is_neighs = list_new ();
lsp->tlv_data.is_neighs->del = free_tlv;
}
is_neigh = XCALLOC (MTYPE_ISIS_TLV, sizeof (struct is_neigh));
memcpy (&is_neigh->neigh_id, isis->sysid, ISIS_SYS_ID_LEN);
listnode_add (lsp->tlv_data.is_neighs, is_neigh);
lsp_debug("ISIS (%s): Adding %s.%02x as old-style neighbor (self)",
area->area_tag, sysid_print(is_neigh->neigh_id),
LSP_PSEUDO_ID(is_neigh->neigh_id));
}
if (circuit->area->newmetric)
{
if (lsp->tlv_data.te_is_neighs == NULL)
{
lsp->tlv_data.te_is_neighs = list_new ();
lsp->tlv_data.te_is_neighs->del = free_tlv;
}
te_is_neigh = XCALLOC (MTYPE_ISIS_TLV, sizeof (struct te_is_neigh));
memcpy (&te_is_neigh->neigh_id, isis->sysid, ISIS_SYS_ID_LEN);
listnode_add (lsp->tlv_data.te_is_neighs, te_is_neigh);
lsp_debug("ISIS (%s): Adding %s.%02x as te-style neighbor (self)",
area->area_tag, sysid_print(te_is_neigh->neigh_id),
LSP_PSEUDO_ID(te_is_neigh->neigh_id));
}
adj_list = list_new ();
isis_adj_build_up_list (circuit->u.bc.adjdb[level - 1], adj_list);
for (ALL_LIST_ELEMENTS_RO (adj_list, node, adj))
{
if (adj->level & level)
{
if ((level == IS_LEVEL_1 && adj->sys_type == ISIS_SYSTYPE_L1_IS) ||
(level == IS_LEVEL_1 && adj->sys_type == ISIS_SYSTYPE_L2_IS &&
adj->adj_usage == ISIS_ADJ_LEVEL1AND2) ||
(level == IS_LEVEL_2 && adj->sys_type == ISIS_SYSTYPE_L2_IS))
{
/* an IS neighbour -> add it */
if (circuit->area->oldmetric)
{
is_neigh = XCALLOC (MTYPE_ISIS_TLV, sizeof (struct is_neigh));
memcpy (&is_neigh->neigh_id, adj->sysid, ISIS_SYS_ID_LEN);
listnode_add (lsp->tlv_data.is_neighs, is_neigh);
lsp_debug("ISIS (%s): Adding %s.%02x as old-style neighbor (peer)",
area->area_tag, sysid_print(is_neigh->neigh_id),
LSP_PSEUDO_ID(is_neigh->neigh_id));
}
if (circuit->area->newmetric)
{
te_is_neigh = XCALLOC (MTYPE_ISIS_TLV,
sizeof (struct te_is_neigh));
memcpy (&te_is_neigh->neigh_id, adj->sysid, ISIS_SYS_ID_LEN);
listnode_add (lsp->tlv_data.te_is_neighs, te_is_neigh);
lsp_debug("ISIS (%s): Adding %s.%02x as te-style neighbor (peer)",
area->area_tag, sysid_print(te_is_neigh->neigh_id),
LSP_PSEUDO_ID(te_is_neigh->neigh_id));
}
}
else if (level == IS_LEVEL_1 && adj->sys_type == ISIS_SYSTYPE_ES)
{
/* an ES neigbour add it, if we are building level 1 LSP */
/* FIXME: the tlv-format is hard to use here */
if (lsp->tlv_data.es_neighs == NULL)
{
lsp->tlv_data.es_neighs = list_new ();
lsp->tlv_data.es_neighs->del = free_tlv;
}
es_neigh = XCALLOC (MTYPE_ISIS_TLV, sizeof (struct es_neigh));
memcpy (&es_neigh->first_es_neigh, adj->sysid, ISIS_SYS_ID_LEN);
listnode_add (lsp->tlv_data.es_neighs, es_neigh);
lsp_debug("ISIS (%s): Adding %s as ES neighbor (peer)",
area->area_tag, sysid_print(es_neigh->first_es_neigh));
}
else
{
lsp_debug("ISIS (%s): Ignoring neighbor %s, level does not match",
area->area_tag, sysid_print(adj->sysid));
}
}
else
{
lsp_debug("ISIS (%s): Ignoring neighbor %s, level does not intersect",
area->area_tag, sysid_print(adj->sysid));
}
}
list_delete (adj_list);
lsp_debug("ISIS (%s): Pseudo LSP construction is complete.", area->area_tag);
/* Reset endp of stream to overwrite only TLV part of it. */
stream_reset (lsp->pdu);
stream_forward_endp (lsp->pdu, ISIS_FIXED_HDR_LEN + ISIS_LSP_HDR_LEN);
/*
* Add the authentication info if it's present
*/
lsp_auth_add (lsp);
if (lsp->tlv_data.is_neighs && listcount (lsp->tlv_data.is_neighs) > 0)
tlv_add_is_neighs (lsp->tlv_data.is_neighs, lsp->pdu);
if (lsp->tlv_data.te_is_neighs && listcount (lsp->tlv_data.te_is_neighs) > 0)
tlv_add_te_is_neighs (lsp->tlv_data.te_is_neighs, lsp->pdu);
if (lsp->tlv_data.es_neighs && listcount (lsp->tlv_data.es_neighs) > 0)
tlv_add_is_neighs (lsp->tlv_data.es_neighs, lsp->pdu);
lsp->lsp_header->pdu_len = htons (stream_get_endp (lsp->pdu));
/* Recompute authentication and checksum information */
lsp_auth_update (lsp);
fletcher_checksum(STREAM_DATA (lsp->pdu) + 12,
ntohs (lsp->lsp_header->pdu_len) - 12, 12);
return;
}
int
lsp_generate_pseudo (struct isis_circuit *circuit, int level)
{
dict_t *lspdb = circuit->area->lspdb[level - 1];
struct isis_lsp *lsp;
u_char lsp_id[ISIS_SYS_ID_LEN + 2];
u_int16_t rem_lifetime, refresh_time;
if ((circuit->is_type & level) != level ||
(circuit->state != C_STATE_UP) ||
(circuit->circ_type != CIRCUIT_T_BROADCAST) ||
(circuit->u.bc.is_dr[level - 1] == 0))
return ISIS_ERROR;
memcpy (lsp_id, isis->sysid, ISIS_SYS_ID_LEN);
LSP_FRAGMENT (lsp_id) = 0;
LSP_PSEUDO_ID (lsp_id) = circuit->circuit_id;
/*
* If for some reason have a pseudo LSP in the db already -> regenerate
*/
if (lsp_search (lsp_id, lspdb))
return lsp_regenerate_schedule_pseudo (circuit, level);
rem_lifetime = lsp_rem_lifetime (circuit->area, level);
/* RFC3787 section 4 SHOULD not set overload bit in pseudo LSPs */
lsp = lsp_new (circuit->area, lsp_id, rem_lifetime, 1,
circuit->area->is_type | circuit->area->attached_bit,
0, level);
lsp->area = circuit->area;
lsp_build_pseudo (lsp, circuit, level);
lsp->own_lsp = 1;
lsp_insert (lsp, lspdb);
lsp_set_all_srmflags (lsp);
refresh_time = lsp_refresh_time (lsp, rem_lifetime);
THREAD_TIMER_OFF (circuit->u.bc.t_refresh_pseudo_lsp[level - 1]);
circuit->lsp_regenerate_pending[level - 1] = 0;
if (level == IS_LEVEL_1)
THREAD_TIMER_ON (master, circuit->u.bc.t_refresh_pseudo_lsp[level - 1],
lsp_l1_refresh_pseudo, circuit, refresh_time);
else if (level == IS_LEVEL_2)
THREAD_TIMER_ON (master, circuit->u.bc.t_refresh_pseudo_lsp[level - 1],
lsp_l2_refresh_pseudo, circuit, refresh_time);
if (isis->debugs & DEBUG_UPDATE_PACKETS)
{
zlog_debug ("ISIS-Upd (%s): Building L%d Pseudo LSP %s, len %d, "
"seq 0x%08x, cksum 0x%04x, lifetime %us, refresh %us",
circuit->area->area_tag, level,
rawlspid_print (lsp->lsp_header->lsp_id),
ntohl (lsp->lsp_header->pdu_len),
ntohl (lsp->lsp_header->seq_num),
ntohs (lsp->lsp_header->checksum),
ntohs (lsp->lsp_header->rem_lifetime),
refresh_time);
}
return ISIS_OK;
}
static int
lsp_regenerate_pseudo (struct isis_circuit *circuit, int level)
{
dict_t *lspdb = circuit->area->lspdb[level - 1];
struct isis_lsp *lsp;
u_char lsp_id[ISIS_SYS_ID_LEN + 2];
u_int16_t rem_lifetime, refresh_time;
if ((circuit->is_type & level) != level ||
(circuit->state != C_STATE_UP) ||
(circuit->circ_type != CIRCUIT_T_BROADCAST) ||
(circuit->u.bc.is_dr[level - 1] == 0))
return ISIS_ERROR;
memcpy (lsp_id, isis->sysid, ISIS_SYS_ID_LEN);
LSP_PSEUDO_ID (lsp_id) = circuit->circuit_id;
LSP_FRAGMENT (lsp_id) = 0;
lsp = lsp_search (lsp_id, lspdb);
if (!lsp)
{
zlog_err ("lsp_regenerate_pseudo: no l%d LSP %s found!",
level, rawlspid_print (lsp_id));
return ISIS_ERROR;
}
lsp_clear_data (lsp);
lsp_build_pseudo (lsp, circuit, level);
/* RFC3787 section 4 SHOULD not set overload bit in pseudo LSPs */
lsp->lsp_header->lsp_bits = lsp_bits_generate (level, 0,
circuit->area->attached_bit);
rem_lifetime = lsp_rem_lifetime (circuit->area, level);
lsp->lsp_header->rem_lifetime = htons (rem_lifetime);
lsp_inc_seqnum (lsp, 0);
lsp->last_generated = time (NULL);
lsp_set_all_srmflags (lsp);
refresh_time = lsp_refresh_time (lsp, rem_lifetime);
if (level == IS_LEVEL_1)
THREAD_TIMER_ON (master, circuit->u.bc.t_refresh_pseudo_lsp[level - 1],
lsp_l1_refresh_pseudo, circuit, refresh_time);
else if (level == IS_LEVEL_2)
THREAD_TIMER_ON (master, circuit->u.bc.t_refresh_pseudo_lsp[level - 1],
lsp_l2_refresh_pseudo, circuit, refresh_time);
if (isis->debugs & DEBUG_UPDATE_PACKETS)
{
zlog_debug ("ISIS-Upd (%s): Refreshing L%d Pseudo LSP %s, len %d, "
"seq 0x%08x, cksum 0x%04x, lifetime %us, refresh %us",
circuit->area->area_tag, level,
rawlspid_print (lsp->lsp_header->lsp_id),
ntohl (lsp->lsp_header->pdu_len),
ntohl (lsp->lsp_header->seq_num),
ntohs (lsp->lsp_header->checksum),
ntohs (lsp->lsp_header->rem_lifetime),
refresh_time);
}
return ISIS_OK;
}
/*
* Something has changed or periodic refresh -> regenerate pseudo LSP
*/
static int
lsp_l1_refresh_pseudo (struct thread *thread)
{
struct isis_circuit *circuit;
u_char id[ISIS_SYS_ID_LEN + 2];
circuit = THREAD_ARG (thread);
circuit->u.bc.t_refresh_pseudo_lsp[0] = NULL;
circuit->lsp_regenerate_pending[0] = 0;
if ((circuit->u.bc.is_dr[0] == 0) ||
(circuit->is_type & IS_LEVEL_1) == 0)
{
memcpy (id, isis->sysid, ISIS_SYS_ID_LEN);
LSP_PSEUDO_ID (id) = circuit->circuit_id;
LSP_FRAGMENT (id) = 0;
lsp_purge_pseudo (id, circuit, IS_LEVEL_1);
return ISIS_ERROR;
}
return lsp_regenerate_pseudo (circuit, IS_LEVEL_1);
}
static int
lsp_l2_refresh_pseudo (struct thread *thread)
{
struct isis_circuit *circuit;
u_char id[ISIS_SYS_ID_LEN + 2];
circuit = THREAD_ARG (thread);
circuit->u.bc.t_refresh_pseudo_lsp[1] = NULL;
circuit->lsp_regenerate_pending[1] = 0;
if ((circuit->u.bc.is_dr[1] == 0) ||
(circuit->is_type & IS_LEVEL_2) == 0)
{
memcpy (id, isis->sysid, ISIS_SYS_ID_LEN);
LSP_PSEUDO_ID (id) = circuit->circuit_id;
LSP_FRAGMENT (id) = 0;
lsp_purge_pseudo (id, circuit, IS_LEVEL_2);
return ISIS_ERROR;
}
return lsp_regenerate_pseudo (circuit, IS_LEVEL_2);
}
int
lsp_regenerate_schedule_pseudo (struct isis_circuit *circuit, int level)
{
struct isis_lsp *lsp;
u_char lsp_id[ISIS_SYS_ID_LEN + 2];
time_t now, diff;
long timeout;
int lvl;
struct isis_area *area = circuit->area;
if (circuit == NULL ||
circuit->circ_type != CIRCUIT_T_BROADCAST ||
circuit->state != C_STATE_UP)
return ISIS_OK;
sched_debug("ISIS (%s): Scheduling regeneration of %s pseudo LSP for interface %s",
area->area_tag, circuit_t2string(level), circuit->interface->name);
memcpy (lsp_id, isis->sysid, ISIS_SYS_ID_LEN);
LSP_PSEUDO_ID (lsp_id) = circuit->circuit_id;
LSP_FRAGMENT (lsp_id) = 0;
now = time (NULL);
for (lvl = IS_LEVEL_1; lvl <= IS_LEVEL_2; lvl++)
{
sched_debug("ISIS (%s): Checking whether L%d pseudo LSP needs to be scheduled",
area->area_tag, lvl);
if (!((level & lvl) && (circuit->is_type & lvl)))
{
sched_debug("ISIS (%s): Level is not active on circuit",
area->area_tag);
continue;
}
if (circuit->u.bc.is_dr[lvl - 1] == 0)
{
sched_debug("ISIS (%s): This IS is not DR, nothing to do.",
area->area_tag);
continue;
}
if (circuit->lsp_regenerate_pending[lvl - 1])
{
struct timeval remain =
thread_timer_remain(circuit->u.bc.t_refresh_pseudo_lsp[lvl - 1]);
sched_debug("ISIS (%s): Regenerate is already pending, nothing todo."
" (Due in %lld.%03lld seconds)", area->area_tag,
(long long)remain.tv_sec, (long long)remain.tv_usec/1000);
continue;
}
lsp = lsp_search (lsp_id, circuit->area->lspdb[lvl - 1]);
if (!lsp)
{
sched_debug("ISIS (%s): Pseudonode LSP does not exist yet, nothing to regenerate.",
area->area_tag);
continue;
}
/*
* Throttle avoidance
*/
sched_debug("ISIS (%s): Will schedule PSN regen timer. Last run was: %lld, Now is: %lld",
area->area_tag, (long long)lsp->last_generated, (long long) now);
THREAD_TIMER_OFF (circuit->u.bc.t_refresh_pseudo_lsp[lvl - 1]);
diff = now - lsp->last_generated;
if (diff < circuit->area->lsp_gen_interval[lvl - 1])
{
timeout = 1000 * (circuit->area->lsp_gen_interval[lvl - 1] - diff);
sched_debug("ISIS (%s): Sechduling in %ld ms to match configured lsp_gen_interval",
area->area_tag, timeout);
}
else
{
timeout = 100;
sched_debug("ISIS (%s): Last generation was more than lsp_gen_interval ago."
" Scheduling for execution in %ld ms.", area->area_tag, timeout);
}
circuit->lsp_regenerate_pending[lvl - 1] = 1;
if (lvl == IS_LEVEL_1)
{
THREAD_TIMER_MSEC_ON(master,
circuit->u.bc.t_refresh_pseudo_lsp[lvl - 1],
lsp_l1_refresh_pseudo, circuit, timeout);
}
else if (lvl == IS_LEVEL_2)
{
THREAD_TIMER_MSEC_ON(master,
circuit->u.bc.t_refresh_pseudo_lsp[lvl - 1],
lsp_l2_refresh_pseudo, circuit, timeout);
}
}
return ISIS_OK;
}
/*
* Walk through LSPs for an area
* - set remaining lifetime
* - set LSPs with SRMflag set for sending
*/
int
lsp_tick (struct thread *thread)
{
struct isis_area *area;
struct isis_circuit *circuit;
struct isis_lsp *lsp;
struct list *lsp_list;
struct listnode *lspnode, *cnode;
dnode_t *dnode, *dnode_next;
int level;
u_int16_t rem_lifetime;
lsp_list = list_new ();
area = THREAD_ARG (thread);
assert (area);
area->t_tick = NULL;
THREAD_TIMER_ON (master, area->t_tick, lsp_tick, area, 1);
/*
* Build a list of LSPs with (any) SRMflag set
* and removed the ones that have aged out
*/
for (level = 0; level < ISIS_LEVELS; level++)
{
if (area->lspdb[level] && dict_count (area->lspdb[level]) > 0)
{
for (dnode = dict_first (area->lspdb[level]);
dnode != NULL; dnode = dnode_next)
{
dnode_next = dict_next (area->lspdb[level], dnode);
lsp = dnode_get (dnode);
/*
* The lsp rem_lifetime is kept at 0 for MaxAge or
* ZeroAgeLifetime depending on explicit purge or
* natural age out. So schedule spf only once when
* the first time rem_lifetime becomes 0.
*/
rem_lifetime = ntohs(lsp->lsp_header->rem_lifetime);
lsp_set_time (lsp);
/*
* Schedule may run spf which should be done only after
* the lsp rem_lifetime becomes 0 for the first time.
* ISO 10589 - 7.3.16.4 first paragraph.
*/
if (rem_lifetime == 1 && lsp->lsp_header->seq_num != 0)
{
/* 7.3.16.4 a) set SRM flags on all */
lsp_set_all_srmflags (lsp);
/* 7.3.16.4 b) retain only the header FIXME */
/* 7.3.16.4 c) record the time to purge FIXME */
/* run/schedule spf */
/* isis_spf_schedule is called inside lsp_destroy() below;
* so it is not needed here. */
/* isis_spf_schedule (lsp->area, lsp->level); */
}
if (lsp->age_out == 0)
{
zlog_debug ("ISIS-Upd (%s): L%u LSP %s seq 0x%08x aged out",
area->area_tag,
lsp->level,
rawlspid_print (lsp->lsp_header->lsp_id),
ntohl (lsp->lsp_header->seq_num));
#ifdef TOPOLOGY_GENERATE
if (lsp->from_topology)
THREAD_TIMER_OFF (lsp->t_lsp_top_ref);
#endif /* TOPOLOGY_GENERATE */
lsp_destroy (lsp);
lsp = NULL;
dict_delete_free (area->lspdb[level], dnode);
}
else if (flags_any_set (lsp->SRMflags))
listnode_add (lsp_list, lsp);
}
/*
* Send LSPs on circuits indicated by the SRMflags
*/
if (listcount (lsp_list) > 0)
{
for (ALL_LIST_ELEMENTS_RO (area->circuit_list, cnode, circuit))
{
int diff = time (NULL) - circuit->lsp_queue_last_cleared;
if (circuit->lsp_queue == NULL ||
diff < MIN_LSP_TRANS_INTERVAL)
continue;
for (ALL_LIST_ELEMENTS_RO (lsp_list, lspnode, lsp))
{
if (circuit->upadjcount[lsp->level - 1] &&
ISIS_CHECK_FLAG (lsp->SRMflags, circuit))
{
/* Add the lsp only if it is not already in lsp
* queue */
if (! listnode_lookup (circuit->lsp_queue, lsp))
{
listnode_add (circuit->lsp_queue, lsp);
thread_add_event (master, send_lsp, circuit, 0);
}
}
}
}
list_delete_all_node (lsp_list);
}
}
}
list_delete (lsp_list);
return ISIS_OK;
}
void
lsp_purge_pseudo (u_char * id, struct isis_circuit *circuit, int level)
{
struct isis_lsp *lsp;
u_int16_t seq_num;
u_int8_t lsp_bits;
lsp = lsp_search (id, circuit->area->lspdb[level - 1]);
if (!lsp)
return;
/* store old values */
seq_num = lsp->lsp_header->seq_num;
lsp_bits = lsp->lsp_header->lsp_bits;
/* reset stream */
lsp_clear_data (lsp);
stream_reset (lsp->pdu);
/* update header */
lsp->lsp_header->pdu_len = htons (ISIS_FIXED_HDR_LEN + ISIS_LSP_HDR_LEN);
memcpy (lsp->lsp_header->lsp_id, id, ISIS_SYS_ID_LEN + 2);
lsp->lsp_header->checksum = 0;
lsp->lsp_header->seq_num = seq_num;
lsp->lsp_header->rem_lifetime = 0;
lsp->lsp_header->lsp_bits = lsp_bits;
lsp->level = level;
lsp->age_out = lsp->area->max_lsp_lifetime[level-1];
stream_forward_endp (lsp->pdu, ISIS_FIXED_HDR_LEN + ISIS_LSP_HDR_LEN);
/*
* Add and update the authentication info if its present
*/
lsp_auth_add (lsp);
lsp->lsp_header->pdu_len = htons (stream_get_endp (lsp->pdu));
lsp_auth_update (lsp);
fletcher_checksum(STREAM_DATA (lsp->pdu) + 12,
ntohs (lsp->lsp_header->pdu_len) - 12, 12);
lsp_set_all_srmflags (lsp);
return;
}
/*
* Purge own LSP that is received and we don't have.
* -> Do as in 7.3.16.4
*/
void
lsp_purge_non_exist (int level,
struct isis_link_state_hdr *lsp_hdr,
struct isis_area *area)
{
struct isis_lsp *lsp;
/*
* We need to create the LSP to be purged
*/
lsp = XCALLOC (MTYPE_ISIS_LSP, sizeof (struct isis_lsp));
lsp->area = area;
lsp->level = level;
lsp->pdu = stream_new(LLC_LEN + area->lsp_mtu);
lsp->isis_header = (struct isis_fixed_hdr *) STREAM_DATA (lsp->pdu);
fill_fixed_hdr (lsp->isis_header, (lsp->level == IS_LEVEL_1) ? L1_LINK_STATE
: L2_LINK_STATE);
lsp->lsp_header = (struct isis_link_state_hdr *) (STREAM_DATA (lsp->pdu) +
ISIS_FIXED_HDR_LEN);
memcpy (lsp->lsp_header, lsp_hdr, ISIS_LSP_HDR_LEN);
stream_forward_endp (lsp->pdu, ISIS_FIXED_HDR_LEN + ISIS_LSP_HDR_LEN);
/*
* Set the remaining lifetime to 0
*/
lsp->lsp_header->rem_lifetime = 0;
/*
* Add and update the authentication info if its present
*/
lsp_auth_add (lsp);
lsp_auth_update (lsp);
/*
* Update the PDU length to header plus any authentication TLV.
*/
lsp->lsp_header->pdu_len = htons (stream_get_endp (lsp->pdu));
/*
* Put the lsp into LSPdb
*/
lsp_insert (lsp, area->lspdb[lsp->level - 1]);
/*
* Send in to whole area
*/
lsp_set_all_srmflags (lsp);
return;
}
void lsp_set_all_srmflags (struct isis_lsp *lsp)
{
struct listnode *node;
struct isis_circuit *circuit;
assert (lsp);
ISIS_FLAGS_CLEAR_ALL(lsp->SRMflags);
if (lsp->area)
{
struct list *circuit_list = lsp->area->circuit_list;
for (ALL_LIST_ELEMENTS_RO (circuit_list, node, circuit))
{
ISIS_SET_FLAG(lsp->SRMflags, circuit);
}
}
}
#ifdef TOPOLOGY_GENERATE
static int
top_lsp_refresh (struct thread *thread)
{
struct isis_lsp *lsp;
u_int16_t rem_lifetime;
lsp = THREAD_ARG (thread);
assert (lsp);
lsp->t_lsp_top_ref = NULL;
lsp_seqnum_update (lsp);
lsp_set_all_srmflags (lsp);
if (isis->debugs & DEBUG_UPDATE_PACKETS)
{
zlog_debug ("ISIS-Upd (): refreshing Topology L1 %s",
rawlspid_print (lsp->lsp_header->lsp_id));
}
/* Refresh dynamic hostname in the cache. */
isis_dynhn_insert (lsp->lsp_header->lsp_id, lsp->tlv_data.hostname,
IS_LEVEL_1);
lsp->lsp_header->lsp_bits = lsp_bits_generate (lsp->level,
lsp->area->overload_bit,
lsp->area->attached_bit);
rem_lifetime = lsp_rem_lifetime (lsp->area, IS_LEVEL_1);
lsp->lsp_header->rem_lifetime = htons (rem_lifetime);
/* refresh_time = lsp_refresh_time (lsp, rem_lifetime); */
THREAD_TIMER_ON (master, lsp->t_lsp_top_ref, top_lsp_refresh, lsp,
lsp->area->lsp_refresh[0]);
return ISIS_OK;
}
void
generate_topology_lsps (struct isis_area *area)
{
struct listnode *node;
int i, max = 0;
struct arc *arc;
u_char lspid[ISIS_SYS_ID_LEN + 2];
struct isis_lsp *lsp;
u_int16_t rem_lifetime, refresh_time;
/* first we find the maximal node */
for (ALL_LIST_ELEMENTS_RO (area->topology, node, arc))
{
if (arc->from_node > max)
max = arc->from_node;
if (arc->to_node > max)
max = arc->to_node;
}
for (i = 1; i < (max + 1); i++)
{
memcpy (lspid, area->topology_baseis, ISIS_SYS_ID_LEN);
LSP_PSEUDO_ID (lspid) = 0x00;
LSP_FRAGMENT (lspid) = 0x00;
lspid[ISIS_SYS_ID_LEN - 1] = (i & 0xFF);
lspid[ISIS_SYS_ID_LEN - 2] = ((i >> 8) & 0xFF);
rem_lifetime = lsp_rem_lifetime (area, IS_LEVEL_1);
lsp = lsp_new (area, lspid, rem_lifetime, 1,
IS_LEVEL_1 | area->overload_bit | area->attached_bit,
0, 1);
if (!lsp)
return;
lsp->from_topology = 1;
/* Creating LSP data based on topology info. */
build_topology_lsp_data (lsp, area, i);
/* Checksum is also calculated here. */
lsp_seqnum_update (lsp);
/* Take care of inserting dynamic hostname into cache. */
isis_dynhn_insert (lspid, lsp->tlv_data.hostname, IS_LEVEL_1);
refresh_time = lsp_refresh_time (lsp, rem_lifetime);
THREAD_TIMER_ON (master, lsp->t_lsp_top_ref, top_lsp_refresh, lsp,
refresh_time);
lsp_set_all_srmflags (lsp);
lsp_insert (lsp, area->lspdb[0]);
}
}
void
remove_topology_lsps (struct isis_area *area)
{
struct isis_lsp *lsp;
dnode_t *dnode, *dnode_next;
dnode = dict_first (area->lspdb[0]);
while (dnode != NULL)
{
dnode_next = dict_next (area->lspdb[0], dnode);
lsp = dnode_get (dnode);
if (lsp->from_topology)
{
THREAD_TIMER_OFF (lsp->t_lsp_top_ref);
lsp_destroy (lsp);
dict_delete (area->lspdb[0], dnode);
}
dnode = dnode_next;
}
}
void
build_topology_lsp_data (struct isis_lsp *lsp, struct isis_area *area,
int lsp_top_num)
{
struct listnode *node;
struct arc *arc;
struct is_neigh *is_neigh;
struct te_is_neigh *te_is_neigh;
char buff[200];
struct tlvs tlv_data;
struct isis_lsp *lsp0 = lsp;
/* Add area addresses. FIXME: Is it needed at all? */
if (lsp->tlv_data.area_addrs == NULL)
lsp->tlv_data.area_addrs = list_new ();
list_add_list (lsp->tlv_data.area_addrs, area->area_addrs);
if (lsp->tlv_data.nlpids == NULL)
lsp->tlv_data.nlpids = XMALLOC (MTYPE_ISIS_TLV, sizeof (struct nlpids));
lsp->tlv_data.nlpids->count = 1;
lsp->tlv_data.nlpids->nlpids[0] = NLPID_IP;
if (area->dynhostname)
{
lsp->tlv_data.hostname = XMALLOC (MTYPE_ISIS_TLV,
sizeof (struct hostname));
memset (buff, 0x00, 200);
sprintf (buff, "%s%d", area->topology_basedynh ? area->topology_basedynh :
"feedme", lsp_top_num);
memcpy (lsp->tlv_data.hostname->name, buff, strlen (buff));
lsp->tlv_data.hostname->namelen = strlen (buff);
}
if (lsp->tlv_data.nlpids)
tlv_add_nlpid (lsp->tlv_data.nlpids, lsp->pdu);
if (lsp->tlv_data.hostname)
tlv_add_dynamic_hostname (lsp->tlv_data.hostname, lsp->pdu);
if (lsp->tlv_data.area_addrs && listcount (lsp->tlv_data.area_addrs) > 0)
tlv_add_area_addrs (lsp->tlv_data.area_addrs, lsp->pdu);
memset (&tlv_data, 0, sizeof (struct tlvs));
if (tlv_data.is_neighs == NULL)
{
tlv_data.is_neighs = list_new ();
tlv_data.is_neighs->del = free_tlv;
}
/* Add reachability for this IS for simulated 1. */
if (lsp_top_num == 1)
{
is_neigh = XCALLOC (MTYPE_ISIS_TLV, sizeof (struct is_neigh));
memcpy (&is_neigh->neigh_id, isis->sysid, ISIS_SYS_ID_LEN);
LSP_PSEUDO_ID (is_neigh->neigh_id) = 0x00;
/* Metric MUST NOT be 0, unless it's not alias TLV. */
is_neigh->metrics.metric_default = 0x01;
is_neigh->metrics.metric_delay = METRICS_UNSUPPORTED;
is_neigh->metrics.metric_expense = METRICS_UNSUPPORTED;
is_neigh->metrics.metric_error = METRICS_UNSUPPORTED;
listnode_add (tlv_data.is_neighs, is_neigh);
}
/* Add IS reachabilities. */
for (ALL_LIST_ELEMENTS_RO (area->topology, node, arc))
{
int to_lsp = 0;
if ((lsp_top_num != arc->from_node) && (lsp_top_num != arc->to_node))
continue;
if (lsp_top_num == arc->from_node)
to_lsp = arc->to_node;
else
to_lsp = arc->from_node;
if (area->oldmetric)
{
is_neigh = XCALLOC (MTYPE_ISIS_TLV, sizeof (struct is_neigh));
memcpy (&is_neigh->neigh_id, area->topology_baseis, ISIS_SYS_ID_LEN);
is_neigh->neigh_id[ISIS_SYS_ID_LEN - 1] = (to_lsp & 0xFF);
is_neigh->neigh_id[ISIS_SYS_ID_LEN - 2] = ((to_lsp >> 8) & 0xFF);
is_neigh->metrics.metric_default = arc->distance;
is_neigh->metrics.metric_delay = METRICS_UNSUPPORTED;
is_neigh->metrics.metric_expense = METRICS_UNSUPPORTED;
is_neigh->metrics.metric_error = METRICS_UNSUPPORTED;
listnode_add (tlv_data.is_neighs, is_neigh);
}
if (area->newmetric)
{
if (tlv_data.te_is_neighs == NULL)
{
tlv_data.te_is_neighs = list_new ();
tlv_data.te_is_neighs->del = free_tlv;
}
te_is_neigh = XCALLOC (MTYPE_ISIS_TLV, sizeof (struct te_is_neigh));
memcpy (&te_is_neigh->neigh_id, area->topology_baseis,
ISIS_SYS_ID_LEN);
te_is_neigh->neigh_id[ISIS_SYS_ID_LEN - 1] = (to_lsp & 0xFF);
te_is_neigh->neigh_id[ISIS_SYS_ID_LEN - 2] = ((to_lsp >> 8) & 0xFF);
SET_TE_METRIC(te_is_neigh, arc->distance);
listnode_add (tlv_data.te_is_neighs, te_is_neigh);
}
}
while (tlv_data.is_neighs && listcount (tlv_data.is_neighs))
{
if (lsp->tlv_data.is_neighs == NULL)
lsp->tlv_data.is_neighs = list_new ();
lsp_tlv_fit (lsp, &tlv_data.is_neighs, &lsp->tlv_data.is_neighs,
IS_NEIGHBOURS_LEN, area->lsp_frag_threshold,
tlv_add_is_neighs);
if (tlv_data.is_neighs && listcount (tlv_data.is_neighs))
lsp = lsp_next_frag (LSP_FRAGMENT (lsp->lsp_header->lsp_id) + 1,
lsp0, area, IS_LEVEL_1);
}
while (tlv_data.te_is_neighs && listcount (tlv_data.te_is_neighs))
{
if (lsp->tlv_data.te_is_neighs == NULL)
lsp->tlv_data.te_is_neighs = list_new ();
lsp_tlv_fit (lsp, &tlv_data.te_is_neighs, &lsp->tlv_data.te_is_neighs,
IS_NEIGHBOURS_LEN, area->lsp_frag_threshold,
tlv_add_te_is_neighs);
if (tlv_data.te_is_neighs && listcount (tlv_data.te_is_neighs))
lsp = lsp_next_frag (LSP_FRAGMENT (lsp->lsp_header->lsp_id) + 1,
lsp0, area, IS_LEVEL_1);
}
free_tlvs (&tlv_data);
return;
}
#endif /* TOPOLOGY_GENERATE */