/*
* 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"
#ifdef CRYPTO_INTERNAL
#include "md5.h"
#endif
#include "table.h"
#include "srcdest_table.h"
#include "lib_errors.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_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_te.h"
#include "isisd/isis_mt.h"
#include "isisd/isis_tlvs.h"
#include "isisd/fabricd.h"
#include "isisd/isis_tx_queue.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);
int lsp_id_cmp(uint8_t *id1, uint8_t *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(uint8_t *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((uint8_t *)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;
isis_free_tlvs(lsp->tlvs);
lsp->tlvs = NULL;
}
static void lsp_remove_frags(struct list *frags, dict_t *lspdb);
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->lspu.frags,
lsp->area->lspdb[lsp->level - 1]);
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);
}
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->hdr.lsp_id);
lsp_destroy(lsp);
dnode_destroy(dict_delete(lspdb, dnode));
}
}
void lsp_search_and_destroy(uint8_t *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->hdr.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, 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(lspid, area->lspdb[level - 1]);
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 isis_lsp *lsp, dict_t *lspdb)
{
dict_alloc_insert(lspdb, lsp->hdr.lsp_id, 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(uint8_t *start_id, uint8_t *stop_id,
struct list *list, dict_t *lspdb)
{
for (dnode_t *curr = dict_lower_bound(lspdb, start_id);
curr; curr = dict_next(lspdb, curr)) {
struct isis_lsp *lsp = curr->dict_data;
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;
uint8_t id[SYSID_STRLEN];
if (dynhost)
dyn = dynhn_find_by_id(lsp_id);
else
dyn = NULL;
if (dyn)
sprintf((char *)id, "%.14s", dyn->hostname);
else if (!memcmp(isis->sysid, lsp_id, ISIS_SYS_ID_LEN) && dynhost)
sprintf((char *)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, 8, "(%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, 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;
}
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)
isis_tlvs_add_extended_ip_reach(lsp->tlvs, ipv4,
metric);
}
}
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) {
isis_tlvs_add_ipv6_reach(lsp->tlvs,
isis_area_ipv6_topology(area),
p, metric);
} 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(frag_id, area->lspdb[level - 1]);
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(lsp, area->lspdb[level - 1]);
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);
}
/* 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) {
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);
/* 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);
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),
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;
}
uint32_t metric = area->oldmetric
? circuit->metric[level - 1]
: circuit->te_metric[level - 1];
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);
struct listnode *ipnode;
struct prefix_ipv4 *ipv4;
for (ALL_LIST_ELEMENTS_RO(circuit->ip_addrs, ipnode,
ipv4)) {
if (area->oldmetric) {
lsp_debug(
"ISIS (%s): Adding old-style IP reachability for %s",
area->area_tag,
prefix2str(ipv4, buf,
sizeof(buf)));
isis_tlvs_add_oldstyle_ip_reach(
lsp->tlvs, ipv4, metric);
}
if (area->newmetric) {
lsp_debug(
"ISIS (%s): Adding te-style IP reachability for %s",
area->area_tag,
prefix2str(ipv4, buf,
sizeof(buf)));
isis_tlvs_add_extended_ip_reach(
lsp->tlvs, ipv4, metric);
}
}
}
if (circuit->ipv6_router && circuit->ipv6_non_link
&& circuit->ipv6_non_link->count > 0) {
struct listnode *ipnode;
struct prefix_ipv6 *ipv6;
for (ALL_LIST_ELEMENTS_RO(circuit->ipv6_non_link,
ipnode, ipv6)) {
lsp_debug(
"ISIS (%s): Adding IPv6 reachability for %s",
area->area_tag,
prefix2str(ipv6, buf, sizeof(buf)));
isis_tlvs_add_ipv6_reach(
lsp->tlvs,
isis_area_ipv6_topology(area), ipv6,
metric);
}
}
switch (circuit->circ_type) {
case CIRCUIT_T_BROADCAST:
if (level & circuit->is_type) {
uint8_t *ne_id =
(level == IS_LEVEL_1)
? circuit->u.bc.l1_desig_is
: circuit->u.bc.l2_desig_is;
if (LSP_PSEUDO_ID(ne_id)) {
if (area->oldmetric) {
lsp_debug(
"ISIS (%s): Adding DIS %s.%02x as old-style neighbor",
area->area_tag,
sysid_print(ne_id),
LSP_PSEUDO_ID(ne_id));
isis_tlvs_add_oldstyle_reach(
lsp->tlvs, ne_id,
metric);
}
if (area->newmetric) {
uint8_t subtlvs[256];
uint8_t subtlv_len;
if (IS_MPLS_TE(isisMplsTE)
&& circuit->interface
&& HAS_LINK_PARAMS(
circuit->interface))
subtlv_len = add_te_subtlvs(
subtlvs,
circuit->mtc);
else
subtlv_len = 0;
tlvs_add_mt_bcast(
lsp->tlvs, circuit,
level, ne_id, metric,
subtlvs, subtlv_len);
}
}
} else {
lsp_debug(
"ISIS (%s): Circuit is not active for current level. Not adding IS neighbors",
area->area_tag);
}
break;
case CIRCUIT_T_P2P: {
struct isis_adjacency *nei = circuit->u.p2p.neighbor;
if (nei && nei->adj_state == ISIS_ADJ_UP
&& (level & nei->circuit_t)) {
uint8_t ne_id[7];
memcpy(ne_id, nei->sysid, ISIS_SYS_ID_LEN);
LSP_PSEUDO_ID(ne_id) = 0;
if (area->oldmetric) {
lsp_debug(
"ISIS (%s): Adding old-style is reach for %s",
area->area_tag,
sysid_print(ne_id));
isis_tlvs_add_oldstyle_reach(
lsp->tlvs, ne_id, metric);
}
if (area->newmetric) {
uint8_t subtlvs[256];
uint8_t subtlv_len;
if (IS_MPLS_TE(isisMplsTE)
&& circuit->interface != NULL
&& HAS_LINK_PARAMS(
circuit->interface))
/* Update Local and Remote IP
* address for MPLS TE circuit
* parameters */
/* NOTE sure that it is the
* pertinent place for that
* updates */
/* Local IP address could be
* updated in isis_circuit.c -
* isis_circuit_add_addr() */
/* But, where update remote IP
* address ? in isis_pdu.c -
* process_p2p_hello() ? */
/* Add SubTLVs & Adjust real
* size of SubTLVs */
subtlv_len = add_te_subtlvs(
subtlvs, circuit->mtc);
else
/* Or keep only TE metric with
* no SubTLVs if MPLS_TE is off
*/
subtlv_len = 0;
uint32_t neighbor_metric;
if (fabricd_tier(area) == 0) {
neighbor_metric = 0xffe;
} else {
neighbor_metric = metric;
}
tlvs_add_mt_p2p(lsp->tlvs, circuit,
ne_id, neighbor_metric,
subtlvs, subtlv_len);
}
} 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);
struct isis_tlvs *tlvs = lsp->tlvs;
lsp->tlvs = NULL;
lsp_adjust_stream(lsp);
lsp_pack_pdu(lsp);
size_t tlv_space = STREAM_WRITEABLE(lsp->pdu) - LLC_LEN;
lsp_clear_data(lsp);
struct list *fragments = isis_fragment_tlvs(tlvs, tlv_space);
if (!fragments) {
zlog_warn("BUG: could not fragment own LSP:");
log_multiline(LOG_WARNING, " ", "%s",
isis_format_tlvs(tlvs));
isis_free_tlvs(tlvs);
return;
}
isis_free_tlvs(tlvs);
bool fragment_overflow = false;
frag = lsp;
for (ALL_LIST_ELEMENTS_RO(fragments, node, tlvs)) {
if (node != listhead(fragments)) {
if (LSP_FRAGMENT(frag->hdr.lsp_id) == 255) {
if (!fragment_overflow) {
fragment_overflow = true;
zlog_warn(
"ISIS (%s): Too much information for 256 fragments",
area->area_tag);
}
isis_free_tlvs(tlvs);
continue;
}
frag = lsp_next_frag(LSP_FRAGMENT(frag->hdr.lsp_id) + 1,
lsp, area, level);
lsp_adjust_stream(frag);
}
frag->tlvs = tlvs;
}
list_delete(&fragments);
lsp_debug("ISIS (%s): LSP construction is complete. Serializing...",
area->area_tag);
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;
uint32_t seq_num = 0;
uint8_t lspid[ISIS_SYS_ID_LEN + 2];
uint16_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 = oldlsp->hdr.seqno;
lsp_search_and_destroy(oldlsp->hdr.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, NULL, 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_seqno_update(newlsp);
newlsp->last_generated = time(NULL);
lsp_flood(newlsp, NULL);
area->lsp_gen_count[level - 1]++;
refresh_time = lsp_refresh_time(newlsp, rem_lifetime);
THREAD_TIMER_OFF(area->t_lsp_refresh[level - 1]);
area->lsp_regenerate_pending[level - 1] = 0;
thread_add_timer(master, lsp_refresh,
&area->lsp_refresh_arg[level - 1], refresh_time,
&area->t_lsp_refresh[level - 1]);
if (isis->debugs & DEBUG_UPDATE_PACKETS) {
zlog_debug("ISIS-Upd (%s): Building L%d LSP %s, len %" PRIu16
", seq 0x%08" PRIx32 ", cksum 0x%04" PRIx16
", lifetime %" PRIu16 "s refresh %" PRIu16 "s",
area->area_tag, level,
rawlspid_print(newlsp->hdr.lsp_id),
newlsp->hdr.pdu_len, newlsp->hdr.seqno,
newlsp->hdr.checksum, newlsp->hdr.rem_lifetime,
refresh_time);
}
sched_debug(
"ISIS (%s): Built L%d LSP. Set triggered regenerate to non-pending.",
area->area_tag, level);
#ifndef FABRICD
/* send northbound notification */
isis_notif_lsp_gen(area, rawlspid_print(newlsp->hdr.lsp_id),
newlsp->hdr.seqno, newlsp->last_generated);
#endif /* ifndef FABRICD */
return ISIS_OK;
}
/*
* Search own LSPs, update holding time and flood
*/
static int lsp_regenerate(struct isis_area *area, int level)
{
dict_t *lspdb;
struct isis_lsp *lsp, *frag;
struct listnode *node;
uint8_t lspid[ISIS_SYS_ID_LEN + 2];
uint16_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) {
flog_err(EC_LIB_DEVELOPMENT,
"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);
rem_lifetime = lsp_rem_lifetime(area, level);
lsp->hdr.rem_lifetime = rem_lifetime;
lsp->last_generated = time(NULL);
lsp_flood(lsp, NULL);
area->lsp_gen_count[level - 1]++;
for (ALL_LIST_ELEMENTS_RO(lsp->lspu.frags, node, frag)) {
if (!frag->tlvs) {
/* Updating and flooding should only affect fragments
* carrying data
*/
continue;
}
frag->hdr.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->hdr.rem_lifetime = rem_lifetime;
frag->age_out = ZERO_AGE_LIFETIME;
lsp_flood(frag, NULL);
}
lsp_seqno_update(lsp);
refresh_time = lsp_refresh_time(lsp, rem_lifetime);
thread_add_timer(master, lsp_refresh,
&area->lsp_refresh_arg[level - 1], refresh_time,
&area->t_lsp_refresh[level - 1]);
area->lsp_regenerate_pending[level - 1] = 0;
if (isis->debugs & DEBUG_UPDATE_PACKETS) {
zlog_debug(
"ISIS-Upd (%s): Refreshed our L%d LSP %s, len %" PRIu16
", seq 0x%08" PRIx32 ", cksum 0x%04" PRIx16
", lifetime %" PRIu16 "s refresh %" PRIu16 "s",
area->area_tag, level, rawlspid_print(lsp->hdr.lsp_id),
lsp->hdr.pdu_len, lsp->hdr.seqno, lsp->hdr.checksum,
lsp->hdr.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_refresh(struct thread *thread)
{
struct lsp_refresh_arg *arg = THREAD_ARG(thread);
assert(arg);
struct isis_area *area = arg->area;
assert(area);
int level = arg->level;
area->t_lsp_refresh[level - 1] = NULL;
area->lsp_regenerate_pending[level - 1] = 0;
if ((area->is_type & level) == 0)
return ISIS_ERROR;
if (monotime_since(&area->last_lsp_refresh_event[level - 1], NULL) < 100000L) {
sched_debug("ISIS (%s): Still unstable, postpone LSP L%d refresh",
area->area_tag, level);
_lsp_regenerate_schedule(area, level, 0, false,
__func__, __FILE__, __LINE__);
return 0;
}
sched_debug(
"ISIS (%s): LSP L%d refresh timer expired. Refreshing LSP...",
area->area_tag, level);
return lsp_regenerate(area, level);
}
int _lsp_regenerate_schedule(struct isis_area *area, int level,
int all_pseudo, bool postpone,
const char *func, const char *file,
int line)
{
struct isis_lsp *lsp;
uint8_t 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"
" Caller: %s %s:%d",
area->area_tag, circuit_t2string(level),
all_pseudo ? "" : "not ",
func, file, line);
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;
if (postpone) {
monotime(&area->last_lsp_refresh_event[lvl - 1]);
}
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;
thread_add_timer_msec(master, lsp_refresh,
&area->lsp_refresh_arg[lvl - 1],
timeout,
&area->t_lsp_refresh[lvl - 1]);
}
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 list *adj_list;
struct listnode *node;
struct isis_area *area = circuit->area;
lsp_clear_data(lsp);
lsp->tlvs = isis_alloc_tlvs();
lsp_debug(
"ISIS (%s): Constructing pseudo LSP %s for interface %s level %d",
area->area_tag, rawlspid_print(lsp->hdr.lsp_id),
circuit->interface->name, level);
lsp->level = level;
/* RFC3787 section 4 SHOULD not set overload bit in pseudo LSPs */
lsp->hdr.lsp_bits =
lsp_bits_generate(level, 0, circuit->area->attached_bit);
/*
* add self to IS neighbours
*/
uint8_t ne_id[ISIS_SYS_ID_LEN + 1];
memcpy(ne_id, isis->sysid, ISIS_SYS_ID_LEN);
LSP_PSEUDO_ID(ne_id) = 0;
if (circuit->area->oldmetric) {
isis_tlvs_add_oldstyle_reach(lsp->tlvs, ne_id, 0);
lsp_debug(
"ISIS (%s): Adding %s.%02x as old-style neighbor (self)",
area->area_tag, sysid_print(ne_id),
LSP_PSEUDO_ID(ne_id));
}
if (circuit->area->newmetric) {
isis_tlvs_add_extended_reach(lsp->tlvs, ISIS_MT_IPV4_UNICAST,
ne_id, 0, NULL, 0);
lsp_debug(
"ISIS (%s): Adding %s.%02x as te-style neighbor (self)",
area->area_tag, sysid_print(ne_id),
LSP_PSEUDO_ID(ne_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)) {
lsp_debug(
"ISIS (%s): Ignoring neighbor %s, level does not intersect",
area->area_tag, sysid_print(adj->sysid));
continue;
}
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)) {
lsp_debug(
"ISIS (%s): Ignoring neighbor %s, level does not match",
area->area_tag, sysid_print(adj->sysid));
continue;
}
memcpy(ne_id, adj->sysid, ISIS_SYS_ID_LEN);
if (circuit->area->oldmetric) {
isis_tlvs_add_oldstyle_reach(lsp->tlvs, ne_id, 0);
lsp_debug(
"ISIS (%s): Adding %s.%02x as old-style neighbor (peer)",
area->area_tag, sysid_print(ne_id),
LSP_PSEUDO_ID(ne_id));
}
if (circuit->area->newmetric) {
isis_tlvs_add_extended_reach(lsp->tlvs,
ISIS_MT_IPV4_UNICAST,
ne_id, 0, NULL, 0);
lsp_debug(
"ISIS (%s): Adding %s.%02x as te-style neighbor (peer)",
area->area_tag, sysid_print(ne_id),
LSP_PSEUDO_ID(ne_id));
}
}
list_delete(&adj_list);
return;
}
int lsp_generate_pseudo(struct isis_circuit *circuit, int level)
{
dict_t *lspdb = circuit->area->lspdb[level - 1];
struct isis_lsp *lsp;
uint8_t lsp_id[ISIS_SYS_ID_LEN + 2];
uint16_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,
NULL, level);
lsp->area = circuit->area;
lsp_build_pseudo(lsp, circuit, level);
lsp_pack_pdu(lsp);
lsp->own_lsp = 1;
lsp_insert(lsp, lspdb);
lsp_flood(lsp, NULL);
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_add_timer(
master, lsp_l1_refresh_pseudo, circuit, refresh_time,
&circuit->u.bc.t_refresh_pseudo_lsp[level - 1]);
else if (level == IS_LEVEL_2)
thread_add_timer(
master, lsp_l2_refresh_pseudo, circuit, refresh_time,
&circuit->u.bc.t_refresh_pseudo_lsp[level - 1]);
if (isis->debugs & DEBUG_UPDATE_PACKETS) {
zlog_debug(
"ISIS-Upd (%s): Built L%d Pseudo LSP %s, len %" PRIu16
", seq 0x%08" PRIx32 ", cksum 0x%04" PRIx16
", lifetime %" PRIu16 "s, refresh %" PRIu16 "s",
circuit->area->area_tag, level,
rawlspid_print(lsp->hdr.lsp_id), lsp->hdr.pdu_len,
lsp->hdr.seqno, lsp->hdr.checksum,
lsp->hdr.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;
uint8_t lsp_id[ISIS_SYS_ID_LEN + 2];
uint16_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) {
flog_err(EC_LIB_DEVELOPMENT,
"lsp_regenerate_pseudo: no l%d LSP %s found!", level,
rawlspid_print(lsp_id));
return ISIS_ERROR;
}
rem_lifetime = lsp_rem_lifetime(circuit->area, level);
lsp->hdr.rem_lifetime = rem_lifetime;
lsp_build_pseudo(lsp, circuit, level);
lsp_inc_seqno(lsp, 0);
lsp->last_generated = time(NULL);
lsp_flood(lsp, NULL);
refresh_time = lsp_refresh_time(lsp, rem_lifetime);
if (level == IS_LEVEL_1)
thread_add_timer(
master, lsp_l1_refresh_pseudo, circuit, refresh_time,
&circuit->u.bc.t_refresh_pseudo_lsp[level - 1]);
else if (level == IS_LEVEL_2)
thread_add_timer(
master, lsp_l2_refresh_pseudo, circuit, refresh_time,
&circuit->u.bc.t_refresh_pseudo_lsp[level - 1]);
if (isis->debugs & DEBUG_UPDATE_PACKETS) {
zlog_debug(
"ISIS-Upd (%s): Refreshed L%d Pseudo LSP %s, len %" PRIu16
", seq 0x%08" PRIx32 ", cksum 0x%04" PRIx16
", lifetime %" PRIu16 "s, refresh %" PRIu16 "s",
circuit->area->area_tag, level,
rawlspid_print(lsp->hdr.lsp_id), lsp->hdr.pdu_len,
lsp->hdr.seqno, lsp->hdr.checksum,
lsp->hdr.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;
uint8_t 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;
uint8_t 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;
uint8_t lsp_id[ISIS_SYS_ID_LEN + 2];
time_t now, diff;
long timeout;
int lvl;
struct isis_area *area = circuit->area;
if (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_add_timer_msec(
master, lsp_l1_refresh_pseudo, circuit, timeout,
&circuit->u.bc.t_refresh_pseudo_lsp[lvl - 1]);
} else if (lvl == IS_LEVEL_2) {
thread_add_timer_msec(
master, lsp_l2_refresh_pseudo, circuit, timeout,
&circuit->u.bc.t_refresh_pseudo_lsp[lvl - 1]);
}
}
return ISIS_OK;
}
/*
* Walk through LSPs for an area
* - set remaining lifetime
*/
int lsp_tick(struct thread *thread)
{
struct isis_area *area;
struct isis_lsp *lsp;
dnode_t *dnode, *dnode_next;
int level;
uint16_t rem_lifetime;
bool fabricd_sync_incomplete = false;
area = THREAD_ARG(thread);
assert(area);
area->t_tick = NULL;
thread_add_timer(master, lsp_tick, area, 1, &area->t_tick);
struct isis_circuit *fabricd_init_c = fabricd_initial_sync_circuit(area);
/*
* Remove LSPs which 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 = lsp->hdr.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->hdr.seqno != 0) {
/* 7.3.16.4 a) set SRM flags on all */
/* 7.3.16.4 b) retain only the header */
if (lsp->area->purge_originator)
lsp_purge(lsp, lsp->level, NULL);
else
lsp_flood(lsp, NULL);
/* 7.3.16.4 c) record the time to purge
* FIXME */
isis_spf_schedule(lsp->area, lsp->level);
}
if (lsp->age_out == 0) {
zlog_debug(
"ISIS-Upd (%s): L%u LSP %s seq "
"0x%08" PRIx32 " aged out",
area->area_tag, lsp->level,
rawlspid_print(lsp->hdr.lsp_id),
lsp->hdr.seqno);
/* if we're aging out fragment 0,
* lsp_destroy() below will delete all
* other fragments too, so we need to
* skip over those
*/
while (!LSP_FRAGMENT(lsp->hdr.lsp_id)
&& dnode_next) {
struct isis_lsp *nextlsp;
nextlsp = dnode_get(dnode_next);
if (memcmp(nextlsp->hdr.lsp_id,
lsp->hdr.lsp_id,
ISIS_SYS_ID_LEN + 1))
break;
dnode_next = dict_next(
area->lspdb[level],
dnode_next);
}
lsp_destroy(lsp);
lsp = NULL;
dict_delete_free(area->lspdb[level],
dnode);
}
if (fabricd_init_c && lsp) {
fabricd_sync_incomplete |=
ISIS_CHECK_FLAG(lsp->SSNflags,
fabricd_init_c);
}
}
}
}
if (fabricd_init_c
&& !fabricd_sync_incomplete
&& !isis_tx_queue_len(fabricd_init_c->tx_queue)) {
fabricd_initial_sync_finish(area);
}
return ISIS_OK;
}
void lsp_purge_pseudo(uint8_t *id, struct isis_circuit *circuit, int level)
{
struct isis_lsp *lsp;
lsp = lsp_search(id, circuit->area->lspdb[level - 1]);
if (!lsp)
return;
lsp_purge(lsp, level, NULL);
}
/*
* 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_lsp_hdr *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_adjust_stream(lsp);
lsp->age_out = ZERO_AGE_LIFETIME;
lsp->area->lsp_purge_count[level - 1]++;
memcpy(&lsp->hdr, hdr, sizeof(lsp->hdr));
lsp->hdr.rem_lifetime = 0;
lsp_purge_add_poi(lsp, NULL);
lsp_pack_pdu(lsp);
lsp_insert(lsp, area->lspdb[lsp->level - 1]);
lsp_flood(lsp, NULL);
return;
}
void lsp_set_all_srmflags(struct isis_lsp *lsp, bool set)
{
struct listnode *node;
struct isis_circuit *circuit;
assert(lsp);
if (!lsp->area)
return;
struct list *circuit_list = lsp->area->circuit_list;
for (ALL_LIST_ELEMENTS_RO(circuit_list, node, circuit)) {
if (set) {
isis_tx_queue_add(circuit->tx_queue, lsp,
TX_LSP_NORMAL);
} else {
isis_tx_queue_del(circuit->tx_queue, lsp);
}
}
}
void _lsp_flood(struct isis_lsp *lsp, struct isis_circuit *circuit,
const char *func, const char *file, int line)
{
if (isis->debugs & DEBUG_FLOODING) {
zlog_debug("Flooding LSP %s%s%s (From %s %s:%d)",
rawlspid_print(lsp->hdr.lsp_id),
circuit ? " except on " : "",
circuit ? circuit->interface->name : "",
func, file, line);
}
if (!fabricd)
lsp_set_all_srmflags(lsp, true);
else
fabricd_lsp_flood(lsp, circuit);
if (circuit)
isis_tx_queue_del(circuit->tx_queue, lsp);
}
static int lsp_handle_adj_state_change(struct isis_adjacency *adj)
{
lsp_regenerate_schedule(adj->circuit->area, IS_LEVEL_1 | IS_LEVEL_2, 0);
return 0;
}
void lsp_init(void)
{
hook_register(isis_adj_state_change_hook,
lsp_handle_adj_state_change);
}