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isis_spf.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* IS-IS Rout(e)ing protocol - isis_spf.c
* The SPT algorithm
*
* Copyright (C) 2001,2002 Sampo Saaristo
* Tampere University of Technology
* Institute of Communications Engineering
* Copyright (C) 2017 Christian Franke <chris@opensourcerouting.org>
*/
#include <zebra.h>
#include "frrevent.h"
#include "linklist.h"
#include "vty.h"
#include "log.h"
#include "command.h"
#include "termtable.h"
#include "memory.h"
#include "prefix.h"
#include "filter.h"
#include "if.h"
#include "hash.h"
#include "table.h"
#include "spf_backoff.h"
#include "srcdest_table.h"
#include "vrf.h"
#include "lib/json.h"
#include "isis_errors.h"
#include "isis_constants.h"
#include "isis_common.h"
#include "isis_flags.h"
#include "isisd.h"
#include "isis_misc.h"
#include "isis_adjacency.h"
#include "isis_circuit.h"
#include "isis_pdu.h"
#include "isis_lsp.h"
#include "isis_dynhn.h"
#include "isis_spf.h"
#include "isis_route.h"
#include "isis_csm.h"
#include "isis_mt.h"
#include "isis_tlvs.h"
#include "isis_flex_algo.h"
#include "isis_zebra.h"
#include "fabricd.h"
#include "isis_spf_private.h"
DEFINE_MTYPE_STATIC(ISISD, ISIS_SPFTREE, "ISIS SPFtree");
DEFINE_MTYPE_STATIC(ISISD, ISIS_SPF_RUN, "ISIS SPF Run Info");
DEFINE_MTYPE_STATIC(ISISD, ISIS_SPF_ADJ, "ISIS SPF Adjacency");
DEFINE_MTYPE_STATIC(ISISD, ISIS_VERTEX, "ISIS vertex");
DEFINE_MTYPE_STATIC(ISISD, ISIS_VERTEX_ADJ, "ISIS SPF Vertex Adjacency");
static void spf_adj_list_parse_lsp(struct isis_spftree *spftree,
struct list *adj_list, struct isis_lsp *lsp,
const uint8_t *pseudo_nodeid,
uint32_t pseudo_metric);
/*
* supports the given af ?
*/
static bool speaks(uint8_t *protocols, uint8_t count, int family)
{
for (uint8_t i = 0; i < count; i++) {
if (family == AF_INET && protocols[i] == NLPID_IP)
return true;
if (family == AF_INET6 && protocols[i] == NLPID_IPV6)
return true;
}
return false;
}
struct isis_spf_run {
struct isis_area *area;
int level;
};
/* 7.2.7 */
static void remove_excess_adjs(struct list *adjs)
{
struct listnode *node, *excess = NULL;
struct isis_vertex_adj *vadj, *candidate = NULL;
int comp;
for (ALL_LIST_ELEMENTS_RO(adjs, node, vadj)) {
struct isis_adjacency *adj, *candidate_adj;
adj = vadj->sadj->adj;
assert(adj);
if (excess == NULL)
excess = node;
candidate = listgetdata(excess);
candidate_adj = candidate->sadj->adj;
if (candidate_adj->sys_type < adj->sys_type) {
excess = node;
continue;
}
if (candidate_adj->sys_type > adj->sys_type)
continue;
comp = memcmp(candidate_adj->sysid, adj->sysid,
ISIS_SYS_ID_LEN);
if (comp > 0) {
excess = node;
continue;
}
if (comp < 0)
continue;
if (candidate_adj->circuit->idx > adj->circuit->idx) {
excess = node;
continue;
}
if (candidate_adj->circuit->idx < adj->circuit->idx)
continue;
comp = memcmp(candidate_adj->snpa, adj->snpa, ETH_ALEN);
if (comp > 0) {
excess = node;
continue;
}
}
list_delete_node(adjs, excess);
return;
}
const char *vtype2string(enum vertextype vtype)
{
switch (vtype) {
case VTYPE_PSEUDO_IS:
return "pseudo_IS";
case VTYPE_PSEUDO_TE_IS:
return "pseudo_TE-IS";
case VTYPE_NONPSEUDO_IS:
return "IS";
case VTYPE_NONPSEUDO_TE_IS:
return "TE-IS";
case VTYPE_ES:
return "ES";
case VTYPE_IPREACH_INTERNAL:
return "IP internal";
case VTYPE_IPREACH_EXTERNAL:
return "IP external";
case VTYPE_IPREACH_TE:
return "IP TE";
case VTYPE_IP6REACH_INTERNAL:
return "IP6 internal";
case VTYPE_IP6REACH_EXTERNAL:
return "IP6 external";
default:
return "UNKNOWN";
}
return NULL; /* Not reached */
}
const char *vid2string(const struct isis_vertex *vertex, char *buff, int size)
{
if (VTYPE_IS(vertex->type) || VTYPE_ES(vertex->type)) {
const char *hostname = print_sys_hostname(vertex->N.id);
strlcpy(buff, hostname, size);
return buff;
}
if (VTYPE_IP(vertex->type)) {
srcdest2str(&vertex->N.ip.p.dest, &vertex->N.ip.p.src, buff,
size);
return buff;
}
return "UNKNOWN";
}
static bool prefix_sid_cmp(const void *value1, const void *value2)
{
const struct isis_vertex *c1 = value1;
const struct isis_vertex *c2 = value2;
if (CHECK_FLAG(c1->N.ip.sr.sid.flags,
ISIS_PREFIX_SID_VALUE | ISIS_PREFIX_SID_LOCAL)
!= CHECK_FLAG(c2->N.ip.sr.sid.flags,
ISIS_PREFIX_SID_VALUE | ISIS_PREFIX_SID_LOCAL))
return false;
return c1->N.ip.sr.sid.value == c2->N.ip.sr.sid.value;
}
static unsigned int prefix_sid_key_make(const void *value)
{
const struct isis_vertex *vertex = value;
return jhash_1word(vertex->N.ip.sr.sid.value, 0);
}
struct isis_vertex *isis_spf_prefix_sid_lookup(struct isis_spftree *spftree,
struct isis_prefix_sid *psid)
{
struct isis_vertex lookup = {};
lookup.N.ip.sr.sid = *psid;
return hash_lookup(spftree->prefix_sids, &lookup);
}
void isis_vertex_adj_free(void *arg)
{
struct isis_vertex_adj *vadj = arg;
XFREE(MTYPE_ISIS_VERTEX_ADJ, vadj);
}
static struct isis_vertex *isis_vertex_new(struct isis_spftree *spftree,
void *id,
enum vertextype vtype)
{
struct isis_vertex *vertex;
vertex = XCALLOC(MTYPE_ISIS_VERTEX, sizeof(struct isis_vertex));
isis_vertex_id_init(vertex, id, vtype);
vertex->Adj_N = list_new();
vertex->Adj_N->del = isis_vertex_adj_free;
vertex->parents = list_new();
if (CHECK_FLAG(spftree->flags, F_SPFTREE_HOPCOUNT_METRIC)) {
vertex->firsthops = hash_create(isis_vertex_queue_hash_key,
isis_vertex_queue_hash_cmp,
NULL);
}
return vertex;
}
void isis_vertex_del(struct isis_vertex *vertex)
{
list_delete(&vertex->Adj_N);
list_delete(&vertex->parents);
hash_clean_and_free(&vertex->firsthops, NULL);
memset(vertex, 0, sizeof(struct isis_vertex));
XFREE(MTYPE_ISIS_VERTEX, vertex);
}
struct isis_vertex_adj *
isis_vertex_adj_add(struct isis_spftree *spftree, struct isis_vertex *vertex,
struct list *vadj_list, struct isis_spf_adj *sadj,
struct isis_prefix_sid *psid, bool last_hop)
{
struct isis_vertex_adj *vadj;
vadj = XCALLOC(MTYPE_ISIS_VERTEX_ADJ, sizeof(*vadj));
vadj->sadj = sadj;
if (spftree->area->srdb.enabled && psid) {
if (vertex->N.ip.sr.present
&& vertex->N.ip.sr.sid.value != psid->value)
zlog_warn(
"ISIS-SPF: ignoring different Prefix-SID for route %pFX",
&vertex->N.ip.p.dest);
else {
vadj->sr.sid = *psid;
vadj->sr.label = sr_prefix_out_label(
spftree->lspdb, vertex->N.ip.p.dest.family,
psid, sadj->id, last_hop);
if (vadj->sr.label != MPLS_INVALID_LABEL)
vadj->sr.present = true;
}
}
listnode_add(vadj_list, vadj);
return vadj;
}
static void isis_vertex_adj_del(struct isis_vertex *vertex,
struct isis_adjacency *adj)
{
struct isis_vertex_adj *vadj;
struct listnode *node, *nextnode;
if (!vertex)
return;
for (ALL_LIST_ELEMENTS(vertex->Adj_N, node, nextnode, vadj)) {
if (vadj->sadj->adj == adj) {
listnode_delete(vertex->Adj_N, vadj);
isis_vertex_adj_free(vadj);
}
}
return;
}
bool isis_vertex_adj_exists(const struct isis_spftree *spftree,
const struct isis_vertex *vertex,
const struct isis_spf_adj *sadj)
{
struct isis_vertex_adj *tmp;
struct listnode *node;
for (ALL_LIST_ELEMENTS_RO(vertex->Adj_N, node, tmp)) {
if (CHECK_FLAG(spftree->flags, F_SPFTREE_NO_ADJACENCIES)) {
if (memcmp(sadj->id, tmp->sadj->id, sizeof(sadj->id))
== 0)
return true;
} else {
if (sadj->adj == tmp->sadj->adj)
return true;
}
}
return false;
}
static void isis_spf_adj_free(void *arg)
{
struct isis_spf_adj *sadj = arg;
XFREE(MTYPE_ISIS_SPF_ADJ, sadj);
}
static void _isis_spftree_init(struct isis_spftree *tree)
{
isis_vertex_queue_init(&tree->tents, "IS-IS SPF tents", true);
isis_vertex_queue_init(&tree->paths, "IS-IS SPF paths", false);
tree->route_table = srcdest_table_init();
tree->route_table->cleanup = isis_route_node_cleanup;
tree->route_table->info = isis_route_table_info_alloc(tree->algorithm);
tree->route_table_backup = srcdest_table_init();
tree->route_table_backup->info =
isis_route_table_info_alloc(tree->algorithm);
tree->route_table_backup->cleanup = isis_route_node_cleanup;
tree->prefix_sids = hash_create(prefix_sid_key_make, prefix_sid_cmp,
"SR Prefix-SID Entries");
tree->sadj_list = list_new();
tree->sadj_list->del = isis_spf_adj_free;
isis_rlfa_list_init(tree);
tree->lfa.remote.pc_spftrees = list_new();
tree->lfa.remote.pc_spftrees->del = (void (*)(void *))isis_spftree_del;
if (tree->type == SPF_TYPE_RLFA || tree->type == SPF_TYPE_TI_LFA) {
isis_spf_node_list_init(&tree->lfa.p_space);
isis_spf_node_list_init(&tree->lfa.q_space);
}
}
struct isis_spftree *
isis_spftree_new(struct isis_area *area, struct lspdb_head *lspdb,
const uint8_t *sysid, int level, enum spf_tree_id tree_id,
enum spf_type type, uint8_t flags, uint8_t algorithm)
{
struct isis_spftree *tree;
tree = XCALLOC(MTYPE_ISIS_SPFTREE, sizeof(struct isis_spftree));
tree->area = area;
tree->lspdb = lspdb;
tree->last_run_timestamp = 0;
tree->last_run_monotime = 0;
tree->last_run_duration = 0;
tree->runcount = 0;
tree->type = type;
memcpy(tree->sysid, sysid, ISIS_SYS_ID_LEN);
tree->level = level;
tree->tree_id = tree_id;
tree->family = (tree->tree_id == SPFTREE_IPV4) ? AF_INET : AF_INET6;
tree->flags = flags;
tree->algorithm = algorithm;
_isis_spftree_init(tree);
return tree;
}
static void _isis_spftree_del(struct isis_spftree *spftree)
{
hash_clean_and_free(&spftree->prefix_sids, NULL);
isis_zebra_rlfa_unregister_all(spftree);
isis_rlfa_list_clear(spftree);
list_delete(&spftree->lfa.remote.pc_spftrees);
if (spftree->type == SPF_TYPE_RLFA
|| spftree->type == SPF_TYPE_TI_LFA) {
isis_spf_node_list_clear(&spftree->lfa.q_space);
isis_spf_node_list_clear(&spftree->lfa.p_space);
}
isis_spf_node_list_clear(&spftree->adj_nodes);
list_delete(&spftree->sadj_list);
isis_vertex_queue_free(&spftree->tents);
isis_vertex_queue_free(&spftree->paths);
isis_route_table_info_free(spftree->route_table->info);
isis_route_table_info_free(spftree->route_table_backup->info);
route_table_finish(spftree->route_table);
route_table_finish(spftree->route_table_backup);
}
void isis_spftree_del(struct isis_spftree *spftree)
{
_isis_spftree_del(spftree);
spftree->route_table = NULL;
XFREE(MTYPE_ISIS_SPFTREE, spftree);
return;
}
#ifndef FABRICD
static void isis_spftree_clear(struct isis_spftree *spftree)
{
_isis_spftree_del(spftree);
_isis_spftree_init(spftree);
}
#endif /* ifndef FABRICD */
static void isis_spftree_adj_del(struct isis_spftree *spftree,
struct isis_adjacency *adj)
{
struct listnode *node;
struct isis_vertex *v;
if (!adj)
return;
assert(!isis_vertex_queue_count(&spftree->tents));
for (ALL_QUEUE_ELEMENTS_RO(&spftree->paths, node, v))
isis_vertex_adj_del(v, adj);
return;
}
void spftree_area_init(struct isis_area *area)
{
for (int tree = SPFTREE_IPV4; tree < SPFTREE_COUNT; tree++) {
for (int level = ISIS_LEVEL1; level <= ISIS_LEVEL2; level++) {
if (!(area->is_type & level))
continue;
if (area->spftree[tree][level - 1])
continue;
area->spftree[tree][level - 1] = isis_spftree_new(
area, &area->lspdb[level - 1],
area->isis->sysid, level, tree,
SPF_TYPE_FORWARD, 0, SR_ALGORITHM_SPF);
}
}
}
void spftree_area_del(struct isis_area *area)
{
for (int tree = SPFTREE_IPV4; tree < SPFTREE_COUNT; tree++) {
for (int level = ISIS_LEVEL1; level <= ISIS_LEVEL2; level++) {
if (!(area->is_type & level))
continue;
if (!area->spftree[tree][level - 1])
continue;
isis_spftree_del(area->spftree[tree][level - 1]);
}
}
}
static int spf_adj_state_change(struct isis_adjacency *adj)
{
struct isis_area *area = adj->circuit->area;
if (adj->adj_state == ISIS_ADJ_UP)
return 0;
/* Remove adjacency from all SPF trees. */
for (int tree = SPFTREE_IPV4; tree < SPFTREE_COUNT; tree++) {
for (int level = ISIS_LEVEL1; level <= ISIS_LEVEL2; level++) {
if (!(area->is_type & level))
continue;
if (!area->spftree[tree][level - 1])
continue;
isis_spftree_adj_del(area->spftree[tree][level - 1],
adj);
}
}
if (fabricd_spftree(area) != NULL)
isis_spftree_adj_del(fabricd_spftree(area), adj);
return 0;
}
/*
* Find the system LSP: returns the LSP in our LSP database
* associated with the given system ID.
*/
struct isis_lsp *isis_root_system_lsp(struct lspdb_head *lspdb,
const uint8_t *sysid)
{
struct isis_lsp *lsp;
uint8_t lspid[ISIS_SYS_ID_LEN + 2];
memcpy(lspid, sysid, ISIS_SYS_ID_LEN);
LSP_PSEUDO_ID(lspid) = 0;
LSP_FRAGMENT(lspid) = 0;
lsp = lsp_search(lspdb, lspid);
if (lsp && lsp->hdr.rem_lifetime != 0)
return lsp;
return NULL;
}
/*
* Add this IS to the root of SPT
*/
static struct isis_vertex *isis_spf_add_root(struct isis_spftree *spftree)
{
struct isis_vertex *vertex;
#ifdef EXTREME_DEBUG
char buff[VID2STR_BUFFER];
#endif /* EXTREME_DEBUG */
vertex = isis_vertex_new(spftree, spftree->sysid,
spftree->area->oldmetric
? VTYPE_NONPSEUDO_IS
: VTYPE_NONPSEUDO_TE_IS);
isis_vertex_queue_append(&spftree->paths, vertex);
#ifdef EXTREME_DEBUG
if (IS_DEBUG_SPF_EVENTS)
zlog_debug(
"ISIS-SPF: A:%hhu added this IS %s %s depth %d dist %d to PATHS",
spftree->algorithm, vtype2string(vertex->type),
vid2string(vertex, buff, sizeof(buff)), vertex->depth,
vertex->d_N);
#endif /* EXTREME_DEBUG */
return vertex;
}
static void vertex_add_parent_firsthop(struct hash_bucket *bucket, void *arg)
{
struct isis_vertex *vertex = arg;
struct isis_vertex *hop = bucket->data;
(void)hash_get(vertex->firsthops, hop, hash_alloc_intern);
}
static void vertex_update_firsthops(struct isis_vertex *vertex,
struct isis_vertex *parent)
{
if (vertex->d_N <= 2)
(void)hash_get(vertex->firsthops, vertex, hash_alloc_intern);
if (vertex->d_N < 2 || !parent)
return;
hash_iterate(parent->firsthops, vertex_add_parent_firsthop, vertex);
}
/*
* Add a vertex to TENT sorted by cost and by vertextype on tie break situation
*/
static struct isis_vertex *
isis_spf_add2tent(struct isis_spftree *spftree, enum vertextype vtype, void *id,
uint32_t cost, int depth, struct isis_spf_adj *sadj,
struct isis_prefix_sid *psid, struct isis_vertex *parent)
{
struct isis_vertex *vertex;
struct listnode *node;
bool last_hop;
char buff[VID2STR_BUFFER];
vertex = isis_find_vertex(&spftree->paths, id, vtype);
if (vertex != NULL) {
zlog_err(
"%s: vertex %s of type %s already in PATH; check for sysId collisions with established neighbors",
__func__, vid2string(vertex, buff, sizeof(buff)),
vtype2string(vertex->type));
return NULL;
}
vertex = isis_find_vertex(&spftree->tents, id, vtype);
if (vertex != NULL) {
zlog_err(
"%s: vertex %s of type %s already in TENT; check for sysId collisions with established neighbors",
__func__, vid2string(vertex, buff, sizeof(buff)),
vtype2string(vertex->type));
return NULL;
}
vertex = isis_vertex_new(spftree, id, vtype);
vertex->d_N = cost;
vertex->depth = depth;
if (VTYPE_IP(vtype) && spftree->area->srdb.enabled && psid) {
struct isis_area *area = spftree->area;
struct isis_vertex *vertex_psid;
/*
* Check if the Prefix-SID is already in use by another prefix.
*/
vertex_psid = isis_spf_prefix_sid_lookup(spftree, psid);
if (vertex_psid
&& !prefix_same(&vertex_psid->N.ip.p.dest,
&vertex->N.ip.p.dest)) {
flog_warn(
EC_ISIS_SID_COLLISION,
"ISIS-Sr (%s): collision detected, prefixes %pFX and %pFX share the same SID %s (%u)",
area->area_tag, &vertex->N.ip.p.dest,
&vertex_psid->N.ip.p.dest,
CHECK_FLAG(psid->flags, ISIS_PREFIX_SID_VALUE)
? "label"
: "index",
psid->value);
psid = NULL;
} else {
bool local;
local = (vertex->depth == 1);
vertex->N.ip.sr.sid = *psid;
vertex->N.ip.sr.label =
sr_prefix_in_label(area, psid, local);
vertex->N.ip.sr.algorithm = psid->algorithm;
if (vertex->N.ip.sr.label != MPLS_INVALID_LABEL)
vertex->N.ip.sr.present = true;
#ifndef FABRICD
if (flex_algo_id_valid(spftree->algorithm) &&
!isis_flex_algo_elected_supported(
spftree->algorithm, spftree->area)) {
vertex->N.ip.sr.present = false;
vertex->N.ip.sr.label = MPLS_INVALID_LABEL;
}
#endif /* ifndef FABRICD */
(void)hash_get(spftree->prefix_sids, vertex,
hash_alloc_intern);
}
}
if (parent) {
listnode_add(vertex->parents, parent);
}
if (CHECK_FLAG(spftree->flags, F_SPFTREE_HOPCOUNT_METRIC))
vertex_update_firsthops(vertex, parent);
last_hop = (vertex->depth == 2);
if (parent && parent->Adj_N && listcount(parent->Adj_N) > 0) {
struct isis_vertex_adj *parent_vadj;
for (ALL_LIST_ELEMENTS_RO(parent->Adj_N, node, parent_vadj))
isis_vertex_adj_add(spftree, vertex, vertex->Adj_N,
parent_vadj->sadj, psid, last_hop);
} else if (sadj) {
isis_vertex_adj_add(spftree, vertex, vertex->Adj_N, sadj, psid,
last_hop);
}
#ifdef EXTREME_DEBUG
if (IS_DEBUG_SPF_EVENTS)
zlog_debug(
"ISIS-SPF: A:%hhu add to TENT %s %s %s depth %d dist %d adjcount %d",
spftree->algorithm, print_sys_hostname(vertex->N.id),
vtype2string(vertex->type),
vid2string(vertex, buff, sizeof(buff)), vertex->depth,
vertex->d_N, listcount(vertex->Adj_N));
#endif /* EXTREME_DEBUG */
isis_vertex_queue_insert(&spftree->tents, vertex);
return vertex;
}
static void isis_spf_add_local(struct isis_spftree *spftree,
enum vertextype vtype, void *id,
struct isis_spf_adj *sadj, uint32_t cost,
struct isis_prefix_sid *psid,
struct isis_vertex *parent)
{
struct isis_vertex *vertex;
vertex = isis_find_vertex(&spftree->tents, id, vtype);
if (vertex) {
/* C.2.5 c) */
if (vertex->d_N == cost) {
if (sadj) {
bool last_hop = (vertex->depth == 2);
isis_vertex_adj_add(spftree, vertex,
vertex->Adj_N, sadj, psid,
last_hop);
}
/* d) */
if (!CHECK_FLAG(spftree->flags,
F_SPFTREE_NO_ADJACENCIES)
&& listcount(vertex->Adj_N) > ISIS_MAX_PATH_SPLITS)
remove_excess_adjs(vertex->Adj_N);
if (parent && (listnode_lookup(vertex->parents, parent)
== NULL))
listnode_add(vertex->parents, parent);
return;
} else if (vertex->d_N < cost) {
/* e) do nothing */
return;
} else { /* vertex->d_N > cost */
/* f) */
isis_vertex_queue_delete(&spftree->tents, vertex);
isis_vertex_del(vertex);
}
}
isis_spf_add2tent(spftree, vtype, id, cost, 1, sadj, psid, parent);
return;
}
static void process_N(struct isis_spftree *spftree, enum vertextype vtype,
void *id, uint32_t dist, uint16_t depth,
struct isis_prefix_sid *psid, struct isis_vertex *parent)
{
struct isis_vertex *vertex;
#ifdef EXTREME_DEBUG
char buff[VID2STR_BUFFER];
#endif
assert(spftree && parent);
if (CHECK_FLAG(spftree->flags, F_SPFTREE_HOPCOUNT_METRIC)
&& !VTYPE_IS(vtype))
return;
struct prefix_pair p;
if (vtype >= VTYPE_IPREACH_INTERNAL) {
memcpy(&p, id, sizeof(p));
apply_mask(&p.dest);
apply_mask(&p.src);
id = &p;
}
/* RFC3787 section 5.1 */
if (spftree->area->newmetric == 1) {
if (dist > MAX_WIDE_PATH_METRIC)
return;
}
/* C.2.6 b) */
else if (spftree->area->oldmetric == 1) {
if (dist > MAX_NARROW_PATH_METRIC)
return;
}
/* c) */
vertex = isis_find_vertex(&spftree->paths, id, vtype);
if (vertex) {
#ifdef EXTREME_DEBUG
if (IS_DEBUG_SPF_EVENTS)
zlog_debug(
"ISIS-SPF: A:%hhu process_N %s %s %s dist %d already found from PATH",
spftree->algorithm,
print_sys_hostname(vertex->N.id),
vtype2string(vtype),
vid2string(vertex, buff, sizeof(buff)), dist);
#endif /* EXTREME_DEBUG */
assert(dist >= vertex->d_N);
return;
}
vertex = isis_find_vertex(&spftree->tents, id, vtype);
/* d) */
if (vertex) {
/* 1) */
#ifdef EXTREME_DEBUG
if (IS_DEBUG_SPF_EVENTS)
zlog_debug(
"ISIS-SPF: A:%hhu process_N %s %s %s dist %d parent %s adjcount %d",
spftree->algorithm,
print_sys_hostname(vertex->N.id),
vtype2string(vtype),
vid2string(vertex, buff, sizeof(buff)), dist,
(parent ? print_sys_hostname(parent->N.id)
: "null"),
(parent ? listcount(parent->Adj_N) : 0));
#endif /* EXTREME_DEBUG */
if (vertex->d_N == dist) {
struct listnode *node;
struct isis_vertex_adj *parent_vadj;
for (ALL_LIST_ELEMENTS_RO(parent->Adj_N, node,
parent_vadj))
if (!isis_vertex_adj_exists(
spftree, vertex,
parent_vadj->sadj)) {
bool last_hop = (vertex->depth == 2);
isis_vertex_adj_add(spftree, vertex,
vertex->Adj_N,
parent_vadj->sadj,
psid, last_hop);
}
if (CHECK_FLAG(spftree->flags,
F_SPFTREE_HOPCOUNT_METRIC))
vertex_update_firsthops(vertex, parent);
/* 2) */
if (!CHECK_FLAG(spftree->flags,
F_SPFTREE_NO_ADJACENCIES)
&& listcount(vertex->Adj_N) > ISIS_MAX_PATH_SPLITS)
remove_excess_adjs(vertex->Adj_N);
if (listnode_lookup(vertex->parents, parent) == NULL)
listnode_add(vertex->parents, parent);
return;
} else if (vertex->d_N < dist) {
return;
/* 4) */
} else {
isis_vertex_queue_delete(&spftree->tents, vertex);
isis_vertex_del(vertex);
}
}
#ifdef EXTREME_DEBUG
if (IS_DEBUG_SPF_EVENTS)
zlog_debug(
"ISIS-SPF: A:%hhu process_N add2tent %s %s dist %d parent %s",
spftree->algorithm, print_sys_hostname(id),
vtype2string(vtype), dist,
(parent ? print_sys_hostname(parent->N.id) : "null"));
#endif /* EXTREME_DEBUG */
isis_spf_add2tent(spftree, vtype, id, dist, depth, NULL, psid, parent);
return;
}
/*
* C.2.6 Step 1
*/
static int isis_spf_process_lsp(struct isis_spftree *spftree,
struct isis_lsp *lsp, uint32_t cost,
uint16_t depth, uint8_t *root_sysid,
struct isis_vertex *parent)
{
bool pseudo_lsp = LSP_PSEUDO_ID(lsp->hdr.lsp_id);
struct listnode *fragnode = NULL;
uint32_t dist;
enum vertextype vtype;
static const uint8_t null_sysid[ISIS_SYS_ID_LEN];
struct isis_mt_router_info *mt_router_info = NULL;
struct prefix_pair ip_info;
bool has_valid_psid;
if (isis_lfa_excise_node_check(spftree, lsp->hdr.lsp_id)) {
if (IS_DEBUG_LFA)
zlog_debug("ISIS-LFA: excising node %s",
print_sys_hostname(lsp->hdr.lsp_id));
return ISIS_OK;
}
if (!lsp->tlvs)
return ISIS_OK;
if (spftree->mtid != ISIS_MT_IPV4_UNICAST)
mt_router_info = isis_tlvs_lookup_mt_router_info(lsp->tlvs,
spftree->mtid);
if (!pseudo_lsp && (spftree->mtid == ISIS_MT_IPV4_UNICAST
&& !speaks(lsp->tlvs->protocols_supported.protocols,
lsp->tlvs->protocols_supported.count,
spftree->family))
&& !mt_router_info)
return ISIS_OK;
/* RFC3787 section 4 SHOULD ignore overload bit in pseudo LSPs */
bool no_overload = (pseudo_lsp
|| (spftree->mtid == ISIS_MT_IPV4_UNICAST
&& !ISIS_MASK_LSP_OL_BIT(lsp->hdr.lsp_bits))
|| (mt_router_info && !mt_router_info->overload));
lspfragloop:
if (lsp->hdr.seqno == 0) {
zlog_warn("%s: lsp with 0 seq_num - ignore", __func__);
return ISIS_WARNING;
}
#ifdef EXTREME_DEBUG
if (IS_DEBUG_SPF_EVENTS)
zlog_debug("ISIS-SPF: A:%hhu process_lsp %s",
spftree->algorithm,
print_sys_hostname(lsp->hdr.lsp_id));
#endif /* EXTREME_DEBUG */
if (no_overload) {
if ((pseudo_lsp || spftree->mtid == ISIS_MT_IPV4_UNICAST)
&& spftree->area->oldmetric) {
struct isis_oldstyle_reach *r;
for (r = (struct isis_oldstyle_reach *)
lsp->tlvs->oldstyle_reach.head;
r; r = r->next) {
if (fabricd)
continue;
/* C.2.6 a) */
/* Two way connectivity */
if (!LSP_PSEUDO_ID(r->id)
&& !memcmp(r->id, root_sysid,
ISIS_SYS_ID_LEN))
continue;
if (!pseudo_lsp
&& !memcmp(r->id, null_sysid,
ISIS_SYS_ID_LEN))
continue;
dist = cost + r->metric;
process_N(spftree,
LSP_PSEUDO_ID(r->id)
? VTYPE_PSEUDO_IS
: VTYPE_NONPSEUDO_IS,
(void *)r->id, dist, depth + 1, NULL,
parent);
}
}
if (spftree->area->newmetric) {
struct isis_item_list *te_neighs = NULL;
if (pseudo_lsp || spftree->mtid == ISIS_MT_IPV4_UNICAST)
te_neighs = &lsp->tlvs->extended_reach;
else
te_neighs = isis_lookup_mt_items(
&lsp->tlvs->mt_reach, spftree->mtid);
struct isis_extended_reach *er;
for (er = te_neighs ? (struct isis_extended_reach *)
te_neighs->head
: NULL;
er; er = er->next) {
/* C.2.6 a) */
/* Two way connectivity */
if (!LSP_PSEUDO_ID(er->id)
&& !memcmp(er->id, root_sysid,
ISIS_SYS_ID_LEN))
continue;
if (!pseudo_lsp
&& !memcmp(er->id, null_sysid,
ISIS_SYS_ID_LEN))
continue;
#ifndef FABRICD
if (flex_algo_id_valid(spftree->algorithm) &&
(!sr_algorithm_participated(
lsp, spftree->algorithm) ||
isis_flex_algo_constraint_drop(spftree,
lsp, er)))
continue;
#endif /* ifndef FABRICD */
dist = cost
+ (CHECK_FLAG(spftree->flags,
F_SPFTREE_HOPCOUNT_METRIC)
? 1
: er->metric);
process_N(spftree,
LSP_PSEUDO_ID(er->id)
? VTYPE_PSEUDO_TE_IS
: VTYPE_NONPSEUDO_TE_IS,
(void *)er->id, dist, depth + 1, NULL,
parent);
}
}
}
if (!fabricd && !pseudo_lsp && spftree->family == AF_INET
&& spftree->mtid == ISIS_MT_IPV4_UNICAST
&& spftree->area->oldmetric) {
struct isis_item_list *reachs[] = {
&lsp->tlvs->oldstyle_ip_reach,
&lsp->tlvs->oldstyle_ip_reach_ext};
for (unsigned int i = 0; i < array_size(reachs); i++) {
vtype = i ? VTYPE_IPREACH_EXTERNAL
: VTYPE_IPREACH_INTERNAL;
memset(&ip_info, 0, sizeof(ip_info));
ip_info.dest.family = AF_INET;
struct isis_oldstyle_ip_reach *r;
for (r = (struct isis_oldstyle_ip_reach *)reachs[i]
->head;
r; r = r->next) {
dist = cost + r->metric;
ip_info.dest.u.prefix4 = r->prefix.prefix;
ip_info.dest.prefixlen = r->prefix.prefixlen;
process_N(spftree, vtype, &ip_info,
dist, depth + 1, NULL, parent);
}
}
}
/* we can skip all the rest if we're using metric style narrow */
if (!spftree->area->newmetric)
goto end;
if (!pseudo_lsp && spftree->family == AF_INET) {
struct isis_item_list *ipv4_reachs;
if (spftree->mtid == ISIS_MT_IPV4_UNICAST)
ipv4_reachs = &lsp->tlvs->extended_ip_reach;
else
ipv4_reachs = isis_lookup_mt_items(
&lsp->tlvs->mt_ip_reach, spftree->mtid);
memset(&ip_info, 0, sizeof(ip_info));
ip_info.dest.family = AF_INET;