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isis_spf.c
1598 lines (1389 loc) · 40.3 KB
/
isis_spf.c
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/*
* 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>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public Licenseas published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; 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 "thread.h"
#include "linklist.h"
#include "vty.h"
#include "log.h"
#include "command.h"
#include "memory.h"
#include "prefix.h"
#include "hash.h"
#include "if.h"
#include "table.h"
#include "spf_backoff.h"
#include "jhash.h"
#include "skiplist.h"
#include "isis_constants.h"
#include "isis_common.h"
#include "isis_flags.h"
#include "dict.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"
DEFINE_MTYPE_STATIC(ISISD, ISIS_SPF_RUN, "ISIS SPF Run Info");
enum vertextype {
VTYPE_PSEUDO_IS = 1,
VTYPE_PSEUDO_TE_IS,
VTYPE_NONPSEUDO_IS,
VTYPE_NONPSEUDO_TE_IS,
VTYPE_ES,
VTYPE_IPREACH_INTERNAL,
VTYPE_IPREACH_EXTERNAL,
VTYPE_IPREACH_TE,
VTYPE_IP6REACH_INTERNAL,
VTYPE_IP6REACH_EXTERNAL
};
#define VTYPE_IS(t) ((t) >= VTYPE_PSEUDO_IS && (t) <= VTYPE_NONPSEUDO_TE_IS)
#define VTYPE_ES(t) ((t) == VTYPE_ES)
#define VTYPE_IP(t) ((t) >= VTYPE_IPREACH_INTERNAL && (t) <= VTYPE_IP6REACH_EXTERNAL)
/*
* Triple <N, d(N), {Adj(N)}>
*/
struct isis_vertex {
enum vertextype type;
union {
u_char id[ISIS_SYS_ID_LEN + 1];
struct prefix prefix;
} N;
u_int32_t d_N; /* d(N) Distance from this IS */
u_int16_t depth; /* The depth in the imaginary tree */
struct list *Adj_N; /* {Adj(N)} next hop or neighbor list */
struct list *parents; /* list of parents for ECMP */
uint64_t insert_counter;
};
/* Vertex Queue and associated functions */
struct isis_vertex_queue {
union {
struct skiplist *slist;
struct list *list;
} l;
struct hash *hash;
uint64_t insert_counter;
};
static unsigned isis_vertex_queue_hash_key(void *vp)
{
struct isis_vertex *vertex = vp;
if (VTYPE_IP(vertex->type))
return prefix_hash_key(&vertex->N.prefix);
return jhash(vertex->N.id, ISIS_SYS_ID_LEN + 1, 0x55aa5a5a);
}
static int isis_vertex_queue_hash_cmp(const void *a, const void *b)
{
const struct isis_vertex *va = a, *vb = b;
if (va->type != vb->type)
return 0;
if (VTYPE_IP(va->type))
return prefix_cmp(&va->N.prefix, &vb->N.prefix) == 0;
return memcmp(va->N.id, vb->N.id, ISIS_SYS_ID_LEN + 1) == 0;
}
/*
* Compares vertizes for sorting in the TENT list. Returns true
* if candidate should be considered before current, false otherwise.
*/
static int isis_vertex_queue_tent_cmp(void *a, void *b)
{
struct isis_vertex *va = a;
struct isis_vertex *vb = b;
if (va->d_N < vb->d_N)
return -1;
if (va->d_N > vb->d_N)
return 1;
if (va->type < vb->type)
return -1;
if (va->type > vb->type)
return 1;
if (va->insert_counter < vb->insert_counter)
return -1;
if (va->insert_counter > vb->insert_counter)
return 1;
return 0;
}
static struct skiplist *isis_vertex_queue_skiplist(void)
{
return skiplist_new(0, isis_vertex_queue_tent_cmp, NULL);
}
static void isis_vertex_queue_init(struct isis_vertex_queue *queue,
const char *name, bool ordered)
{
if (ordered) {
queue->insert_counter = 1;
queue->l.slist = isis_vertex_queue_skiplist();
} else {
queue->insert_counter = 0;
queue->l.list = list_new();
}
queue->hash = hash_create(isis_vertex_queue_hash_key,
isis_vertex_queue_hash_cmp, name);
}
static void isis_vertex_del(struct isis_vertex *vertex);
static void isis_vertex_queue_clear(struct isis_vertex_queue *queue)
{
hash_clean(queue->hash, NULL);
if (queue->insert_counter) {
struct isis_vertex *vertex;
while (0 == skiplist_first(queue->l.slist, NULL,
(void **)&vertex)) {
isis_vertex_del(vertex);
skiplist_delete_first(queue->l.slist);
}
queue->insert_counter = 1;
} else {
queue->l.list->del = (void (*)(void *))isis_vertex_del;
list_delete_all_node(queue->l.list);
queue->l.list->del = NULL;
}
}
static void isis_vertex_queue_free(struct isis_vertex_queue *queue)
{
isis_vertex_queue_clear(queue);
hash_free(queue->hash);
queue->hash = NULL;
if (queue->insert_counter) {
skiplist_free(queue->l.slist);
queue->l.slist = NULL;
} else
list_delete_and_null(&queue->l.list);
}
static unsigned int isis_vertex_queue_count(struct isis_vertex_queue *queue)
{
return hashcount(queue->hash);
}
static void isis_vertex_queue_append(struct isis_vertex_queue *queue,
struct isis_vertex *vertex)
{
assert(!queue->insert_counter);
listnode_add(queue->l.list, vertex);
struct isis_vertex *inserted;
inserted = hash_get(queue->hash, vertex, hash_alloc_intern);
assert(inserted == vertex);
}
static void isis_vertex_queue_insert(struct isis_vertex_queue *queue,
struct isis_vertex *vertex)
{
assert(queue->insert_counter);
vertex->insert_counter = queue->insert_counter++;
assert(queue->insert_counter != (uint64_t)-1);
skiplist_insert(queue->l.slist, vertex, vertex);
struct isis_vertex *inserted;
inserted = hash_get(queue->hash, vertex, hash_alloc_intern);
assert(inserted == vertex);
}
static struct isis_vertex *
isis_vertex_queue_pop(struct isis_vertex_queue *queue)
{
assert(queue->insert_counter);
struct isis_vertex *rv;
if (skiplist_first(queue->l.slist, NULL, (void **)&rv))
return NULL;
skiplist_delete_first(queue->l.slist);
hash_release(queue->hash, rv);
return rv;
}
static void isis_vertex_queue_delete(struct isis_vertex_queue *queue,
struct isis_vertex *vertex)
{
assert(queue->insert_counter);
skiplist_delete(queue->l.slist, vertex, vertex);
hash_release(queue->hash, vertex);
}
#define ALL_QUEUE_ELEMENTS_RO(queue, node, data) \
ALL_LIST_ELEMENTS_RO((queue)->l.list, node, data)
/* End of vertex queue definitions */
struct isis_spftree {
struct isis_vertex_queue paths; /* the SPT */
struct isis_vertex_queue tents; /* TENT */
struct isis_area *area; /* back pointer to area */
unsigned int runcount; /* number of runs since uptime */
time_t last_run_timestamp; /* last run timestamp as wall time for
display */
time_t last_run_monotime; /* last run as monotime for scheduling */
time_t last_run_duration; /* last run duration in msec */
uint16_t mtid;
int family;
int level;
};
/*
* 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_adjacency *adj, *candidate = NULL;
int comp;
for (ALL_LIST_ELEMENTS_RO(adjs, node, adj)) {
if (excess == NULL)
excess = node;
candidate = listgetdata(excess);
if (candidate->sys_type < adj->sys_type) {
excess = node;
continue;
}
if (candidate->sys_type > adj->sys_type)
continue;
comp = memcmp(candidate->sysid, adj->sysid, ISIS_SYS_ID_LEN);
if (comp > 0) {
excess = node;
continue;
}
if (comp < 0)
continue;
if (candidate->circuit->circuit_id > adj->circuit->circuit_id) {
excess = node;
continue;
}
if (candidate->circuit->circuit_id < adj->circuit->circuit_id)
continue;
comp = memcmp(candidate->snpa, adj->snpa, ETH_ALEN);
if (comp > 0) {
excess = node;
continue;
}
}
list_delete_node(adjs, excess);
return;
}
static const char *vtype2string(enum vertextype vtype)
{
switch (vtype) {
case VTYPE_PSEUDO_IS:
return "pseudo_IS";
break;
case VTYPE_PSEUDO_TE_IS:
return "pseudo_TE-IS";
break;
case VTYPE_NONPSEUDO_IS:
return "IS";
break;
case VTYPE_NONPSEUDO_TE_IS:
return "TE-IS";
break;
case VTYPE_ES:
return "ES";
break;
case VTYPE_IPREACH_INTERNAL:
return "IP internal";
break;
case VTYPE_IPREACH_EXTERNAL:
return "IP external";
break;
case VTYPE_IPREACH_TE:
return "IP TE";
break;
case VTYPE_IP6REACH_INTERNAL:
return "IP6 internal";
break;
case VTYPE_IP6REACH_EXTERNAL:
return "IP6 external";
break;
default:
return "UNKNOWN";
}
return NULL; /* Not reached */
}
static const char *vid2string(struct isis_vertex *vertex, char *buff, int size)
{
if (VTYPE_IS(vertex->type) || VTYPE_ES(vertex->type)) {
return print_sys_hostname(vertex->N.id);
}
if (VTYPE_IP(vertex->type)) {
prefix2str((struct prefix *)&vertex->N.prefix, buff, size);
return buff;
}
return "UNKNOWN";
}
static void isis_vertex_id_init(struct isis_vertex *vertex, void *id,
enum vertextype vtype)
{
vertex->type = vtype;
if (VTYPE_IS(vtype) || VTYPE_ES(vtype)) {
memcpy(vertex->N.id, (u_char *)id, ISIS_SYS_ID_LEN + 1);
} else if (VTYPE_IP(vtype)) {
memcpy(&vertex->N.prefix, (struct prefix *)id,
sizeof(struct prefix));
} else {
zlog_err("WTF!");
}
}
static struct isis_vertex *isis_vertex_new(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->parents = list_new();
return vertex;
}
static void isis_vertex_del(struct isis_vertex *vertex)
{
list_delete_and_null(&vertex->Adj_N);
list_delete_and_null(&vertex->parents);
memset(vertex, 0, sizeof(struct isis_vertex));
XFREE(MTYPE_ISIS_VERTEX, vertex);
return;
}
static void isis_vertex_adj_del(struct isis_vertex *vertex,
struct isis_adjacency *adj)
{
struct listnode *node, *nextnode;
if (!vertex)
return;
for (node = listhead(vertex->Adj_N); node; node = nextnode) {
nextnode = listnextnode(node);
if (listgetdata(node) == adj)
list_delete_node(vertex->Adj_N, node);
}
return;
}
struct isis_spftree *isis_spftree_new(struct isis_area *area)
{
struct isis_spftree *tree;
tree = XCALLOC(MTYPE_ISIS_SPFTREE, sizeof(struct isis_spftree));
if (tree == NULL) {
zlog_err("ISIS-Spf: isis_spftree_new Out of memory!");
return NULL;
}
isis_vertex_queue_init(&tree->tents, "IS-IS SPF tents", true);
isis_vertex_queue_init(&tree->paths, "IS-IS SPF paths", false);
tree->area = area;
tree->last_run_timestamp = 0;
tree->last_run_monotime = 0;
tree->last_run_duration = 0;
tree->runcount = 0;
return tree;
}
void isis_spftree_del(struct isis_spftree *spftree)
{
isis_vertex_queue_free(&spftree->tents);
isis_vertex_queue_free(&spftree->paths);
XFREE(MTYPE_ISIS_SPFTREE, spftree);
return;
}
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)
{
if (area->is_type & IS_LEVEL_1) {
if (area->spftree[0] == NULL)
area->spftree[0] = isis_spftree_new(area);
if (area->spftree6[0] == NULL)
area->spftree6[0] = isis_spftree_new(area);
}
if (area->is_type & IS_LEVEL_2) {
if (area->spftree[1] == NULL)
area->spftree[1] = isis_spftree_new(area);
if (area->spftree6[1] == NULL)
area->spftree6[1] = isis_spftree_new(area);
}
return;
}
void spftree_area_del(struct isis_area *area)
{
if (area->is_type & IS_LEVEL_1) {
if (area->spftree[0] != NULL) {
isis_spftree_del(area->spftree[0]);
area->spftree[0] = NULL;
}
if (area->spftree6[0]) {
isis_spftree_del(area->spftree6[0]);
area->spftree6[0] = NULL;
}
}
if (area->is_type & IS_LEVEL_2) {
if (area->spftree[1] != NULL) {
isis_spftree_del(area->spftree[1]);
area->spftree[1] = NULL;
}
if (area->spftree6[1] != NULL) {
isis_spftree_del(area->spftree6[1]);
area->spftree6[1] = NULL;
}
}
return;
}
void spftree_area_adj_del(struct isis_area *area, struct isis_adjacency *adj)
{
if (area->is_type & IS_LEVEL_1) {
if (area->spftree[0] != NULL)
isis_spftree_adj_del(area->spftree[0], adj);
if (area->spftree6[0] != NULL)
isis_spftree_adj_del(area->spftree6[0], adj);
}
if (area->is_type & IS_LEVEL_2) {
if (area->spftree[1] != NULL)
isis_spftree_adj_del(area->spftree[1], adj);
if (area->spftree6[1] != NULL)
isis_spftree_adj_del(area->spftree6[1], adj);
}
return;
}
/*
* Find the system LSP: returns the LSP in our LSP database
* associated with the given system ID.
*/
static struct isis_lsp *isis_root_system_lsp(struct isis_area *area, int level,
u_char *sysid)
{
struct isis_lsp *lsp;
u_char 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(lspid, area->lspdb[level - 1]);
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,
u_char *sysid)
{
struct isis_vertex *vertex;
struct isis_lsp *lsp;
#ifdef EXTREME_DEBUG
char buff[PREFIX2STR_BUFFER];
#endif /* EXTREME_DEBUG */
u_char id[ISIS_SYS_ID_LEN + 1];
memcpy(id, sysid, ISIS_SYS_ID_LEN);
LSP_PSEUDO_ID(id) = 0;
lsp = isis_root_system_lsp(spftree->area, spftree->level, sysid);
if (lsp == NULL)
zlog_warn("ISIS-Spf: could not find own l%d LSP!",
spftree->level);
vertex = isis_vertex_new(id,
spftree->area->oldmetric
? VTYPE_NONPSEUDO_IS
: VTYPE_NONPSEUDO_TE_IS);
isis_vertex_queue_append(&spftree->paths, vertex);
#ifdef EXTREME_DEBUG
zlog_debug("ISIS-Spf: added this IS %s %s depth %d dist %d to PATHS",
vtype2string(vertex->type),
vid2string(vertex, buff, sizeof(buff)), vertex->depth,
vertex->d_N);
#endif /* EXTREME_DEBUG */
return vertex;
}
static struct isis_vertex *isis_find_vertex(struct isis_vertex_queue *queue,
void *id, enum vertextype vtype)
{
struct isis_vertex querier;
isis_vertex_id_init(&querier, id, vtype);
return hash_lookup(queue->hash, &querier);
}
/*
* 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_adjacency *adj,
struct isis_vertex *parent)
{
struct isis_vertex *vertex;
struct listnode *node;
struct isis_adjacency *parent_adj;
#ifdef EXTREME_DEBUG
char buff[PREFIX2STR_BUFFER];
#endif
assert(isis_find_vertex(&spftree->paths, id, vtype) == NULL);
assert(isis_find_vertex(&spftree->tents, id, vtype) == NULL);
vertex = isis_vertex_new(id, vtype);
vertex->d_N = cost;
vertex->depth = depth;
if (parent) {
listnode_add(vertex->parents, parent);
}
if (parent && parent->Adj_N && listcount(parent->Adj_N) > 0) {
for (ALL_LIST_ELEMENTS_RO(parent->Adj_N, node, parent_adj))
listnode_add(vertex->Adj_N, parent_adj);
} else if (adj) {
listnode_add(vertex->Adj_N, adj);
}
#ifdef EXTREME_DEBUG
zlog_debug(
"ISIS-Spf: add to TENT %s %s %s depth %d dist %d adjcount %d",
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_adjacency *adj, uint32_t cost,
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 (adj)
listnode_add(vertex->Adj_N, adj);
/* d) */
if (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, adj, parent);
return;
}
static void process_N(struct isis_spftree *spftree, enum vertextype vtype,
void *id, uint32_t dist, uint16_t depth,
struct isis_vertex *parent)
{
struct isis_vertex *vertex;
#ifdef EXTREME_DEBUG
char buff[PREFIX2STR_BUFFER];
#endif
assert(spftree && parent);
struct prefix p;
if (vtype >= VTYPE_IPREACH_INTERNAL) {
prefix_copy(&p, id);
apply_mask(&p);
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
zlog_debug(
"ISIS-Spf: process_N %s %s %s dist %d already found from PATH",
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
zlog_debug(
"ISIS-Spf: process_N %s %s %s dist %d parent %s adjcount %d",
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_adjacency *parent_adj;
for (ALL_LIST_ELEMENTS_RO(parent->Adj_N, node,
parent_adj))
if (listnode_lookup(vertex->Adj_N, parent_adj)
== NULL)
listnode_add(vertex->Adj_N, parent_adj);
/* 2) */
if (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
zlog_debug("ISIS-Spf: process_N add2tent %s %s dist %d parent %s",
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, 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, u_char *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 u_char null_sysid[ISIS_SYS_ID_LEN];
struct isis_mt_router_info *mt_router_info = NULL;
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(
"isis_spf_process_lsp(): lsp with 0 seq_num - ignore");
return ISIS_WARNING;
}
#ifdef EXTREME_DEBUG
zlog_debug("ISIS-Spf: process_lsp %s",
print_sys_hostname(lsp->hdr.lsp_id));
#endif /* EXTREME_DEBUG */
if (no_overload) {
if (pseudo_lsp || spftree->mtid == ISIS_MT_IPV4_UNICAST) {
struct isis_oldstyle_reach *r;
for (r = (struct isis_oldstyle_reach *)
lsp->tlvs->oldstyle_reach.head;
r; r = r->next) {
/* C.2.6 a) */
/* Two way connectivity */
if (!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,
parent);
}
}
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) {
if (!memcmp(er->id, root_sysid, ISIS_SYS_ID_LEN))
continue;
if (!pseudo_lsp
&& !memcmp(er->id, null_sysid, ISIS_SYS_ID_LEN))
continue;
dist = cost + er->metric;
process_N(spftree,
LSP_PSEUDO_ID(er->id) ? VTYPE_PSEUDO_TE_IS
: VTYPE_NONPSEUDO_TE_IS,
(void *)er->id, dist, depth + 1, parent);
}
}
if (!pseudo_lsp && spftree->family == AF_INET
&& spftree->mtid == ISIS_MT_IPV4_UNICAST) {
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;
struct isis_oldstyle_ip_reach *r;
for (r = (struct isis_oldstyle_ip_reach *)reachs[i]
->head;
r; r = r->next) {
dist = cost + r->metric;
process_N(spftree, vtype, (void *)&r->prefix,
dist, depth + 1, parent);
}
}
}
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);
struct isis_extended_ip_reach *r;
for (r = ipv4_reachs
? (struct isis_extended_ip_reach *)
ipv4_reachs->head
: NULL;
r; r = r->next) {
dist = cost + r->metric;
process_N(spftree, VTYPE_IPREACH_TE, (void *)&r->prefix,
dist, depth + 1, parent);
}
}
if (!pseudo_lsp && spftree->family == AF_INET6) {
struct isis_item_list *ipv6_reachs;
if (spftree->mtid == ISIS_MT_IPV4_UNICAST)
ipv6_reachs = &lsp->tlvs->ipv6_reach;
else
ipv6_reachs = isis_lookup_mt_items(
&lsp->tlvs->mt_ipv6_reach, spftree->mtid);
struct isis_ipv6_reach *r;
for (r = ipv6_reachs
? (struct isis_ipv6_reach *)ipv6_reachs->head
: NULL;
r; r = r->next) {
dist = cost + r->metric;
vtype = r->external ? VTYPE_IP6REACH_EXTERNAL
: VTYPE_IP6REACH_INTERNAL;
process_N(spftree, vtype, (void *)&r->prefix, dist,
depth + 1, parent);
}
}
if (fragnode == NULL)
fragnode = listhead(lsp->lspu.frags);
else
fragnode = listnextnode(fragnode);
if (fragnode) {
lsp = listgetdata(fragnode);
goto lspfragloop;
}
return ISIS_OK;
}
static int isis_spf_preload_tent(struct isis_spftree *spftree,
u_char *root_sysid, struct isis_vertex *parent)
{
struct isis_circuit *circuit;
struct listnode *cnode, *anode, *ipnode;
struct isis_adjacency *adj;
struct isis_lsp *lsp;
struct list *adj_list;
struct list *adjdb;
struct prefix_ipv4 *ipv4;
struct prefix prefix;
int retval = ISIS_OK;
u_char lsp_id[ISIS_SYS_ID_LEN + 2];
static u_char null_lsp_id[ISIS_SYS_ID_LEN + 2];
struct prefix_ipv6 *ipv6;
struct isis_circuit_mt_setting *circuit_mt;
for (ALL_LIST_ELEMENTS_RO(spftree->area->circuit_list, cnode,
circuit)) {
circuit_mt = circuit_lookup_mt_setting(circuit, spftree->mtid);
if (circuit_mt && !circuit_mt->enabled)
continue;
if (circuit->state != C_STATE_UP)
continue;
if (!(circuit->is_type & spftree->level))