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isis_lsp.c
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/*
* 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; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 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 "srcdest_table.h"
#include "lib_errors.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_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"
#include "isisd/isis_mt.h"
#include "isisd/isis_tlvs.h"
#include "isisd/isis_te.h"
#include "isisd/isis_sr.h"
#include "isisd/fabricd.h"
#include "isisd/isis_tx_queue.h"
#include "isisd/isis_nb.h"
static int lsp_refresh(struct thread *thread);
static int lsp_l1_refresh_pseudo(struct thread *thread);
static int lsp_l2_refresh_pseudo(struct thread *thread);
static void lsp_destroy(struct isis_lsp *lsp);
int lsp_id_cmp(uint8_t *id1, uint8_t *id2)
{
return memcmp(id1, id2, ISIS_SYS_ID_LEN + 2);
}
int lspdb_compare(const struct isis_lsp *a, const struct isis_lsp *b)
{
return memcmp(a->hdr.lsp_id, b->hdr.lsp_id, sizeof(a->hdr.lsp_id));
}
void lsp_db_init(struct lspdb_head *head)
{
lspdb_init(head);
}
void lsp_db_fini(struct lspdb_head *head)
{
struct isis_lsp *lsp;
while ((lsp = lspdb_pop(head)))
lsp_destroy(lsp);
lspdb_fini(head);
}
struct isis_lsp *lsp_search(struct lspdb_head *head, const uint8_t *id)
{
struct isis_lsp searchfor;
memcpy(searchfor.hdr.lsp_id, id, sizeof(searchfor.hdr.lsp_id));
return lspdb_find(head, &searchfor);
}
static void lsp_clear_data(struct isis_lsp *lsp)
{
if (!lsp)
return;
isis_free_tlvs(lsp->tlvs);
lsp->tlvs = NULL;
}
static void lsp_remove_frags(struct lspdb_head *head, struct list *frags);
static void lsp_destroy(struct isis_lsp *lsp)
{
struct listnode *cnode;
struct isis_circuit *circuit;
if (!lsp)
return;
for (ALL_LIST_ELEMENTS_RO(lsp->area->circuit_list, cnode, circuit))
isis_tx_queue_del(circuit->tx_queue, lsp);
ISIS_FLAGS_CLEAR_ALL(lsp->SSNflags);
lsp_clear_data(lsp);
if (!LSP_FRAGMENT(lsp->hdr.lsp_id)) {
if (lsp->lspu.frags) {
lsp_remove_frags(&lsp->area->lspdb[lsp->level - 1],
lsp->lspu.frags);
list_delete(&lsp->lspu.frags);
}
} else {
if (lsp->lspu.zero_lsp
&& lsp->lspu.zero_lsp->lspu.frags) {
listnode_delete(lsp->lspu.zero_lsp->lspu.frags, lsp);
}
}
isis_spf_schedule(lsp->area, lsp->level);
if (lsp->pdu)
stream_free(lsp->pdu);
fabricd_lsp_free(lsp);
XFREE(MTYPE_ISIS_LSP, lsp);
}
/*
* Remove all the frags belonging to the given lsp
*/
static void lsp_remove_frags(struct lspdb_head *head, struct list *frags)
{
struct listnode *lnode, *lnnode;
struct isis_lsp *lsp;
for (ALL_LIST_ELEMENTS(frags, lnode, lnnode, lsp)) {
lsp = lsp_search(head, lsp->hdr.lsp_id);
lspdb_del(head, lsp);
lsp_destroy(lsp);
}
}
void lsp_search_and_destroy(struct lspdb_head *head, const uint8_t *id)
{
struct isis_lsp *lsp;
lsp = lsp_search(head, id);
if (lsp) {
lspdb_del(head, lsp);
/*
* If this is a zero lsp, remove all the frags now
*/
if (LSP_FRAGMENT(lsp->hdr.lsp_id) == 0) {
if (lsp->lspu.frags)
lsp_remove_frags(head, lsp->lspu.frags);
} 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);
}
}
/*
* Compares a LSP to given values
* Params are given in net order
*/
int lsp_compare(char *areatag, struct isis_lsp *lsp, uint32_t seqno,
uint16_t checksum, uint16_t rem_lifetime)
{
if (lsp->hdr.seqno == seqno && lsp->hdr.checksum == checksum
&& ((lsp->hdr.rem_lifetime == 0 && rem_lifetime == 0)
|| (lsp->hdr.rem_lifetime != 0 && rem_lifetime != 0))) {
if (isis->debugs & DEBUG_SNP_PACKETS) {
zlog_debug(
"ISIS-Snp (%s): Compare LSP %s seq 0x%08" PRIx32
", cksum 0x%04" PRIx16 ", lifetime %" PRIu16
"s",
areatag, rawlspid_print(lsp->hdr.lsp_id),
lsp->hdr.seqno, lsp->hdr.checksum,
lsp->hdr.rem_lifetime);
zlog_debug(
"ISIS-Snp (%s): is equal to ours seq 0x%08" PRIx32
", cksum 0x%04" PRIx16 ", lifetime %" PRIu16
"s",
areatag, seqno, checksum, 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 (seqno > lsp->hdr.seqno
|| (seqno == lsp->hdr.seqno
&& ((lsp->hdr.rem_lifetime != 0 && rem_lifetime == 0)
|| (lsp->hdr.checksum != checksum
&& lsp->hdr.rem_lifetime)))) {
if (isis->debugs & DEBUG_SNP_PACKETS) {
zlog_debug(
"ISIS-Snp (%s): Compare LSP %s seq 0x%08" PRIx32
", cksum 0x%04" PRIx16 ", lifetime %" PRIu16
"s",
areatag, rawlspid_print(lsp->hdr.lsp_id), seqno,
checksum, rem_lifetime);
zlog_debug(
"ISIS-Snp (%s): is newer than ours seq 0x%08" PRIx32
", cksum 0x%04" PRIx16 ", lifetime %" PRIu16
"s",
areatag, lsp->hdr.seqno, lsp->hdr.checksum,
lsp->hdr.rem_lifetime);
}
return LSP_NEWER;
}
if (isis->debugs & DEBUG_SNP_PACKETS) {
zlog_debug("ISIS-Snp (%s): Compare LSP %s seq 0x%08" PRIx32
", cksum 0x%04" PRIx16 ", lifetime %" PRIu16 "s",
areatag, rawlspid_print(lsp->hdr.lsp_id), seqno,
checksum, rem_lifetime);
zlog_debug(
"ISIS-Snp (%s): is older than ours seq 0x%08" PRIx32
", cksum 0x%04" PRIx16 ", lifetime %" PRIu16 "s",
areatag, lsp->hdr.seqno, lsp->hdr.checksum,
lsp->hdr.rem_lifetime);
}
return LSP_OLDER;
}
static void put_lsp_hdr(struct isis_lsp *lsp, size_t *len_pointer, bool keep)
{
uint8_t pdu_type =
(lsp->level == IS_LEVEL_1) ? L1_LINK_STATE : L2_LINK_STATE;
struct isis_lsp_hdr *hdr = &lsp->hdr;
struct stream *stream = lsp->pdu;
size_t orig_getp = 0, orig_endp = 0;
if (keep) {
orig_getp = stream_get_getp(lsp->pdu);
orig_endp = stream_get_endp(lsp->pdu);
}
stream_set_getp(lsp->pdu, 0);
stream_set_endp(lsp->pdu, 0);
fill_fixed_hdr(pdu_type, stream);
if (len_pointer)
*len_pointer = stream_get_endp(stream);
stream_putw(stream, hdr->pdu_len);
stream_putw(stream, hdr->rem_lifetime);
stream_put(stream, hdr->lsp_id, sizeof(hdr->lsp_id));
stream_putl(stream, hdr->seqno);
stream_putw(stream, hdr->checksum);
stream_putc(stream, hdr->lsp_bits);
if (keep) {
stream_set_endp(lsp->pdu, orig_endp);
stream_set_getp(lsp->pdu, orig_getp);
}
}
static void lsp_add_auth(struct isis_lsp *lsp)
{
struct isis_passwd *passwd;
passwd = (lsp->level == IS_LEVEL_1) ? &lsp->area->area_passwd
: &lsp->area->domain_passwd;
isis_tlvs_add_auth(lsp->tlvs, passwd);
}
static void lsp_pack_pdu(struct isis_lsp *lsp)
{
if (!lsp->tlvs)
lsp->tlvs = isis_alloc_tlvs();
lsp_add_auth(lsp);
size_t len_pointer;
put_lsp_hdr(lsp, &len_pointer, false);
isis_pack_tlvs(lsp->tlvs, lsp->pdu, len_pointer, false, true);
lsp->hdr.pdu_len = stream_get_endp(lsp->pdu);
lsp->hdr.checksum =
ntohs(fletcher_checksum(STREAM_DATA(lsp->pdu) + 12,
stream_get_endp(lsp->pdu) - 12, 12));
}
void lsp_inc_seqno(struct isis_lsp *lsp, uint32_t seqno)
{
uint32_t newseq;
if (seqno == 0 || lsp->hdr.seqno > seqno)
newseq = lsp->hdr.seqno + 1;
else
newseq = seqno + 1;
#ifndef FABRICD
/* check for overflow */
if (newseq < lsp->hdr.seqno) {
/* send northbound notification */
isis_notif_lsp_exceed_max(lsp->area,
rawlspid_print(lsp->hdr.lsp_id));
}
#endif /* ifndef FABRICD */
lsp->hdr.seqno = newseq;
lsp_pack_pdu(lsp);
isis_spf_schedule(lsp->area, lsp->level);
}
static void lsp_purge_add_poi(struct isis_lsp *lsp,
const uint8_t *sender)
{
if (!lsp->area->purge_originator)
return;
/* add purge originator identification */
if (!lsp->tlvs)
lsp->tlvs = isis_alloc_tlvs();
isis_tlvs_set_purge_originator(lsp->tlvs, isis->sysid, sender);
isis_tlvs_set_dynamic_hostname(lsp->tlvs, cmd_hostname_get());
}
static void lsp_purge(struct isis_lsp *lsp, int level,
const uint8_t *sender)
{
/* reset stream */
lsp_clear_data(lsp);
stream_reset(lsp->pdu);
/* update header */
lsp->hdr.checksum = 0;
lsp->hdr.rem_lifetime = 0;
lsp->level = level;
lsp->age_out = lsp->area->max_lsp_lifetime[level - 1];
lsp->area->lsp_purge_count[level - 1]++;
lsp_purge_add_poi(lsp, sender);
lsp_pack_pdu(lsp);
lsp_flood(lsp, NULL);
}
/*
* Generates checksum for LSP and its frags
*/
static void lsp_seqno_update(struct isis_lsp *lsp0)
{
struct isis_lsp *lsp;
struct listnode *node;
lsp_inc_seqno(lsp0, 0);
if (!lsp0->lspu.frags)
return;
for (ALL_LIST_ELEMENTS_RO(lsp0->lspu.frags, node, lsp)) {
if (lsp->tlvs)
lsp_inc_seqno(lsp, 0);
else if (lsp->hdr.rem_lifetime) {
/* Purge should only be applied when the fragment has
* non-zero remaining lifetime.
*/
lsp_purge(lsp, lsp0->level, NULL);
}
}
return;
}
static uint8_t lsp_bits_generate(int level, int overload_bit, int attached_bit)
{
uint8_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 isis_lsp_hdr *hdr,
struct isis_tlvs *tlvs, struct stream *stream,
struct isis_area *area, int level)
{
/* 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);
memcpy(&lsp->hdr, hdr, sizeof(lsp->hdr));
lsp->area = area;
lsp->level = level;
lsp->age_out = ZERO_AGE_LIFETIME;
lsp->installed = time(NULL);
lsp->tlvs = tlvs;
if (area->dynhostname && lsp->tlvs->hostname
&& lsp->hdr.rem_lifetime) {
isis_dynhn_insert(lsp->hdr.lsp_id, lsp->tlvs->hostname,
(lsp->hdr.lsp_bits & LSPBIT_IST)
== IS_LEVEL_1_AND_2
? IS_LEVEL_2
: IS_LEVEL_1);
}
return;
}
static void lsp_link_fragment(struct isis_lsp *lsp, struct isis_lsp *lsp0)
{
if (!LSP_FRAGMENT(lsp->hdr.lsp_id)) {
/* zero lsp -> create list to store fragments */
lsp->lspu.frags = list_new();
} else {
/* fragment -> set backpointer and add to zero lsps list */
assert(lsp0);
lsp->lspu.zero_lsp = lsp0;
listnode_add(lsp0->lspu.frags, lsp);
}
}
void lsp_update(struct isis_lsp *lsp, struct isis_lsp_hdr *hdr,
struct isis_tlvs *tlvs, struct stream *stream,
struct isis_area *area, int level, bool confusion)
{
if (lsp->own_lsp) {
flog_err(
EC_LIB_DEVELOPMENT,
"ISIS-Upd (%s): BUG updating LSP %s still marked as own LSP",
area->area_tag, rawlspid_print(lsp->hdr.lsp_id));
lsp_clear_data(lsp);
lsp->own_lsp = 0;
}
if (confusion) {
lsp_purge(lsp, level, NULL);
} else {
lsp_update_data(lsp, hdr, tlvs, stream, area, level);
}
if (LSP_FRAGMENT(lsp->hdr.lsp_id) && !lsp->lspu.zero_lsp) {
uint8_t lspid[ISIS_SYS_ID_LEN + 2];
struct isis_lsp *lsp0;
memcpy(lspid, lsp->hdr.lsp_id, ISIS_SYS_ID_LEN + 1);
LSP_FRAGMENT(lspid) = 0;
lsp0 = lsp_search(&area->lspdb[level - 1], lspid);
if (lsp0)
lsp_link_fragment(lsp, lsp0);
}
if (lsp->hdr.seqno)
isis_spf_schedule(lsp->area, lsp->level);
}
/* creation of LSP directly from what we received */
struct isis_lsp *lsp_new_from_recv(struct isis_lsp_hdr *hdr,
struct isis_tlvs *tlvs,
struct stream *stream, 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, hdr, tlvs, stream, area, level);
lsp_link_fragment(lsp, lsp0);
return lsp;
}
static void lsp_adjust_stream(struct isis_lsp *lsp)
{
if (lsp->pdu) {
if (STREAM_SIZE(lsp->pdu) == LLC_LEN + lsp->area->lsp_mtu)
return;
stream_free(lsp->pdu);
}
lsp->pdu = stream_new(LLC_LEN + lsp->area->lsp_mtu);
}
struct isis_lsp *lsp_new(struct isis_area *area, uint8_t *lsp_id,
uint16_t rem_lifetime, uint32_t seqno,
uint8_t lsp_bits, uint16_t checksum,
struct isis_lsp *lsp0, int level)
{
struct isis_lsp *lsp;
lsp = XCALLOC(MTYPE_ISIS_LSP, sizeof(struct isis_lsp));
lsp->area = area;
lsp_adjust_stream(lsp);
/* Minimal LSP PDU size */
lsp->hdr.pdu_len = ISIS_FIXED_HDR_LEN + ISIS_LSP_HDR_LEN;
memcpy(lsp->hdr.lsp_id, lsp_id, sizeof(lsp->hdr.lsp_id));
lsp->hdr.checksum = checksum;
lsp->hdr.seqno = seqno;
lsp->hdr.rem_lifetime = rem_lifetime;
lsp->hdr.lsp_bits = lsp_bits;
lsp->level = level;
lsp->age_out = ZERO_AGE_LIFETIME;
lsp_link_fragment(lsp, lsp0);
put_lsp_hdr(lsp, NULL, false);
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->hdr.lsp_id),
LSP_FRAGMENT(lsp->hdr.lsp_id), lsp->hdr.pdu_len,
lsp->hdr.seqno);
return lsp;
}
void lsp_insert(struct lspdb_head *head, struct isis_lsp *lsp)
{
lspdb_add(head, lsp);
if (lsp->hdr.seqno)
isis_spf_schedule(lsp->area, lsp->level);
}
/*
* Build a list of LSPs with non-zero ht bounded by start and stop ids
*/
void lsp_build_list_nonzero_ht(struct lspdb_head *head, const uint8_t *start_id,
const uint8_t *stop_id, struct list *list)
{
struct isis_lsp searchfor;
struct isis_lsp *lsp, *start;
memcpy(&searchfor.hdr.lsp_id, start_id, sizeof(searchfor.hdr.lsp_id));
start = lspdb_find_gteq(head, &searchfor);
frr_each_from (lspdb, head, lsp, start) {
if (memcmp(lsp->hdr.lsp_id, stop_id,
ISIS_SYS_ID_LEN + 2) > 0)
break;
if (lsp->hdr.rem_lifetime)
listnode_add(list, lsp);
}
}
static void lsp_set_time(struct isis_lsp *lsp)
{
assert(lsp);
if (lsp->hdr.rem_lifetime == 0) {
if (lsp->age_out > 0)
lsp->age_out--;
return;
}
lsp->hdr.rem_lifetime--;
if (lsp->pdu && stream_get_endp(lsp->pdu) >= 12)
stream_putw_at(lsp->pdu, 10, lsp->hdr.rem_lifetime);
}
void lspid_print(uint8_t *lsp_id, char *dest, char dynhost, char frag)
{
struct isis_dynhn *dyn = NULL;
char id[SYSID_STRLEN];
if (dynhost)
dyn = dynhn_find_by_id(lsp_id);
else
dyn = NULL;
if (dyn)
snprintf(id, sizeof(id), "%.14s", dyn->hostname);
else if (!memcmp(isis->sysid, lsp_id, ISIS_SYS_ID_LEN) && dynhost)
snprintf(id, sizeof(id), "%.14s", cmd_hostname_get());
else
memcpy(id, sysid_print(lsp_id), 15);
if (frag)
sprintf(dest, "%s.%02x-%02x", id, LSP_PSEUDO_ID(lsp_id),
LSP_FRAGMENT(lsp_id));
else
sprintf(dest, "%s.%02x", id, LSP_PSEUDO_ID(lsp_id));
}
/* Convert the lsp attribute bits to attribute string */
static const char *lsp_bits2string(uint8_t lsp_bits, char *buf, size_t buf_size)
{
char *pos = buf;
if (!lsp_bits)
return " none";
if (buf_size < 2 * 3)
return " error";
/* 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);
sprintf(pos, "%d", ISIS_MASK_LSP_OL_BIT(lsp_bits) ? 1 : 0);
return buf;
}
/* this function prints the lsp on show isis database */
void lsp_print(struct isis_lsp *lsp, struct vty *vty, char dynhost)
{
char LSPid[255];
char age_out[8];
char b[200];
lspid_print(lsp->hdr.lsp_id, LSPid, dynhost, 1);
vty_out(vty, "%-21s%c ", LSPid, lsp->own_lsp ? '*' : ' ');
vty_out(vty, "%5" PRIu16 " ", lsp->hdr.pdu_len);
vty_out(vty, "0x%08" PRIx32 " ", lsp->hdr.seqno);
vty_out(vty, "0x%04" PRIx16 " ", lsp->hdr.checksum);
if (lsp->hdr.rem_lifetime == 0) {
snprintf(age_out, sizeof(age_out), "(%d)", lsp->age_out);
age_out[7] = '\0';
vty_out(vty, "%7s ", age_out);
} else
vty_out(vty, " %5" PRIu16 " ", lsp->hdr.rem_lifetime);
vty_out(vty, "%s\n", lsp_bits2string(lsp->hdr.lsp_bits, b, sizeof(b)));
}
void lsp_print_detail(struct isis_lsp *lsp, struct vty *vty, char dynhost)
{
lsp_print(lsp, vty, dynhost);
if (lsp->tlvs)
vty_multiline(vty, " ", "%s", isis_format_tlvs(lsp->tlvs));
vty_out(vty, "\n");
}
/* print all the lsps info in the local lspdb */
int lsp_print_all(struct vty *vty, struct lspdb_head *head, char detail,
char dynhost)
{
struct isis_lsp *lsp;
int lsp_count = 0;
if (detail == ISIS_UI_LEVEL_BRIEF) {
frr_each (lspdb, head, lsp) {
lsp_print(lsp, vty, dynhost);
lsp_count++;
}
} else if (detail == ISIS_UI_LEVEL_DETAIL) {
frr_each (lspdb, head, lsp) {
lsp_print_detail(lsp, vty, dynhost);
lsp_count++;
}
}
return lsp_count;
}
static uint16_t lsp_rem_lifetime(struct isis_area *area, int level)
{
uint16_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 uint16_t lsp_refresh_time(struct isis_lsp *lsp, uint16_t rem_lifetime)
{
struct isis_area *area = lsp->area;
int level = lsp->level;
uint16_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 void lsp_build_ext_reach_ipv4(struct isis_lsp *lsp,
struct isis_area *area)
{
struct route_table *er_table = get_ext_reach(area, AF_INET, lsp->level);
if (!er_table)
return;
for (struct route_node *rn = route_top(er_table); rn;
rn = route_next(rn)) {
if (!rn->info)
continue;
struct prefix_ipv4 *ipv4 = (struct prefix_ipv4 *)&rn->p;
struct isis_ext_info *info = rn->info;
uint32_t metric = info->metric;
if (metric > MAX_WIDE_PATH_METRIC)
metric = MAX_WIDE_PATH_METRIC;
if (area->oldmetric && metric > 0x3f)
metric = 0x3f;
if (area->oldmetric)
isis_tlvs_add_oldstyle_ip_reach(lsp->tlvs, ipv4,
metric);
if (area->newmetric) {
struct sr_prefix_cfg *pcfg = NULL;
if (area->srdb.enabled)
pcfg = isis_sr_cfg_prefix_find(area, ipv4);
isis_tlvs_add_extended_ip_reach(lsp->tlvs, ipv4, metric,
true, pcfg);
}
}
}
static void lsp_build_ext_reach_ipv6(struct isis_lsp *lsp,
struct isis_area *area)
{
struct route_table *er_table =
get_ext_reach(area, AF_INET6, lsp->level);
if (!er_table)
return;
for (struct route_node *rn = route_top(er_table); rn;
rn = srcdest_route_next(rn)) {
if (!rn->info)
continue;
struct isis_ext_info *info = rn->info;
struct prefix_ipv6 *p, *src_p;
srcdest_rnode_prefixes(rn, (const struct prefix **)&p,
(const struct prefix **)&src_p);
uint32_t metric = info->metric;
if (info->metric > MAX_WIDE_PATH_METRIC)
metric = MAX_WIDE_PATH_METRIC;
if (!src_p || !src_p->prefixlen) {
struct sr_prefix_cfg *pcfg = NULL;
if (area->srdb.enabled)
pcfg = isis_sr_cfg_prefix_find(area, p);
isis_tlvs_add_ipv6_reach(lsp->tlvs,
isis_area_ipv6_topology(area),
p, metric, true, pcfg);
} else if (isis_area_ipv6_dstsrc_enabled(area)) {
isis_tlvs_add_ipv6_dstsrc_reach(lsp->tlvs,
ISIS_MT_IPV6_DSTSRC,
p, src_p, metric);
}
}
}
static void lsp_build_ext_reach(struct isis_lsp *lsp, struct isis_area *area)
{
lsp_build_ext_reach_ipv4(lsp, area);
lsp_build_ext_reach_ipv6(lsp, area);
}
static struct isis_lsp *lsp_next_frag(uint8_t frag_num, struct isis_lsp *lsp0,
struct isis_area *area, int level)
{
struct isis_lsp *lsp;
uint8_t frag_id[ISIS_SYS_ID_LEN + 2];
memcpy(frag_id, lsp0->hdr.lsp_id, ISIS_SYS_ID_LEN + 1);
LSP_FRAGMENT(frag_id) = frag_num;
lsp = lsp_search(&area->lspdb[level - 1], frag_id);
if (lsp) {
lsp_clear_data(lsp);
if (!lsp->lspu.zero_lsp)
lsp_link_fragment(lsp, lsp0);
return lsp;
}
lsp = lsp_new(area, frag_id, lsp0->hdr.rem_lifetime, 0,
lsp_bits_generate(level, area->overload_bit,
area->attached_bit),
0, lsp0, level);
lsp->own_lsp = 1;
lsp_insert(&area->lspdb[level - 1], lsp);
return lsp;
}
/*
* 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)
{
int level = lsp->level;
char buf[PREFIX2STR_BUFFER];
struct listnode *node;
struct isis_lsp *frag;
lsp_clear_data(lsp);
for (ALL_LIST_ELEMENTS_RO(lsp->lspu.frags, node, frag))
lsp_clear_data(frag);
lsp->tlvs = isis_alloc_tlvs();
lsp_debug("ISIS (%s): Constructing local system LSP for level %d",
area->area_tag, level);
lsp->hdr.lsp_bits = lsp_bits_generate(level, area->overload_bit,
area->attached_bit);
lsp_add_auth(lsp);
isis_tlvs_add_area_addresses(lsp->tlvs, area->area_addrs);
/* Protocols Supported */
if (area->ip_circuits > 0 || area->ipv6_circuits > 0) {
struct nlpids nlpids = {.count = 0};
if (area->ip_circuits > 0) {
lsp_debug(
"ISIS (%s): Found IPv4 circuit, adding IPv4 to NLPIDs",
area->area_tag);
nlpids.nlpids[nlpids.count] = NLPID_IP;
nlpids.count++;
}
if (area->ipv6_circuits > 0) {
lsp_debug(
"ISIS (%s): Found IPv6 circuit, adding IPv6 to NLPIDs",
area->area_tag);
nlpids.nlpids[nlpids.count] = NLPID_IPV6;
nlpids.count++;
}
isis_tlvs_set_protocols_supported(lsp->tlvs, &nlpids);
}
if (area_is_mt(area)) {
lsp_debug("ISIS (%s): Adding MT router tlv...", area->area_tag);
struct isis_area_mt_setting **mt_settings;
unsigned int mt_count;
mt_settings = area_mt_settings(area, &mt_count);
for (unsigned int i = 0; i < mt_count; i++) {
isis_tlvs_add_mt_router_info(
lsp->tlvs, mt_settings[i]->mtid,
mt_settings[i]->overload, false);
lsp_debug("ISIS (%s): MT %s", area->area_tag,
isis_mtid2str(mt_settings[i]->mtid));
}
} else {
lsp_debug("ISIS (%s): Not adding MT router tlv (disabled)",
area->area_tag);
}
/* Dynamic Hostname */
if (area->dynhostname) {
isis_tlvs_set_dynamic_hostname(lsp->tlvs, cmd_hostname_get());
lsp_debug("ISIS (%s): Adding dynamic hostname '%s'",
area->area_tag, cmd_hostname_get());
} else {
lsp_debug("ISIS (%s): Not adding dynamic hostname (disabled)",
area->area_tag);
}
/* Add Router Capability TLV. */
if (isis->router_id != 0) {
struct isis_router_cap cap = {};
cap.router_id.s_addr = isis->router_id;
/* Add SR Sub-TLVs if SR is enabled. */
if (area->srdb.enabled) {
struct isis_sr_db *srdb = &area->srdb;
uint32_t range_size;
range_size = srdb->config.srgb_upper_bound
- srdb->config.srgb_lower_bound + 1;
cap.srgb.flags = ISIS_SUBTLV_SRGB_FLAG_I
| ISIS_SUBTLV_SRGB_FLAG_V;
cap.srgb.range_size = range_size;
cap.srgb.lower_bound = srdb->config.srgb_lower_bound;
cap.algo[0] = SR_ALGORITHM_SPF;
cap.algo[1] = SR_ALGORITHM_UNSET;
cap.msd = srdb->config.msd;
}
isis_tlvs_set_router_capability(lsp->tlvs, &cap);
lsp_debug("ISIS (%s): Adding Router Capabilities information",
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. TE router ID will be the same if MPLS-TE
* is not activate or MPLS-TE router-id not specified
*/
if (isis->router_id != 0) {
struct in_addr id = {.s_addr = isis->router_id};
inet_ntop(AF_INET, &id, buf, sizeof(buf));
lsp_debug("ISIS (%s): Adding router ID %s as IPv4 tlv.",
area->area_tag, buf);
isis_tlvs_add_ipv4_address(lsp->tlvs, &id);
/* If new style TLV's are in use, add TE router ID TLV
* Check if MPLS-TE is activate and mpls-te router-id set
* otherwise add exactly same data as for IPv4 address
*/
if (area->newmetric) {
if (IS_MPLS_TE(area->mta)
&& area->mta->router_id.s_addr != 0)
id.s_addr = area->mta->router_id.s_addr;
lsp_debug(
"ISIS (%s): Adding router ID also as TE router ID tlv.",
area->area_tag);
isis_tlvs_set_te_router_id(lsp->tlvs, &id);
}
} else {
lsp_debug("ISIS (%s): Router ID is unset. Not adding tlv.",
area->area_tag);
}
lsp_debug("ISIS (%s): Adding circuit specific information.",
area->area_tag);
if (fabricd) {
lsp_debug(
"ISIS (%s): Adding tier %" PRIu8 " spine-leaf-extension tlv.",
area->area_tag, fabricd_tier(area));
isis_tlvs_add_spine_leaf(lsp->tlvs, fabricd_tier(area), true,
false, false, false);
}
struct isis_circuit *circuit;
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),