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isis_circuit.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* IS-IS Rout(e)ing protocol - isis_circuit.h
*
* Copyright (C) 2001,2002 Sampo Saaristo
* Tampere University of Technology
* Institute of Communications Engineering
*/
#include <zebra.h>
#ifdef GNU_LINUX
#include <net/ethernet.h>
#else
#include <netinet/if_ether.h>
#endif
#include "log.h"
#include "memory.h"
#include "vrf.h"
#include "if.h"
#include "linklist.h"
#include "command.h"
#include "frrevent.h"
#include "vty.h"
#include "hash.h"
#include "prefix.h"
#include "stream.h"
#include "qobj.h"
#include "lib/northbound_cli.h"
#include "isisd/isis_constants.h"
#include "isisd/isis_common.h"
#include "isisd/isis_flags.h"
#include "isisd/isis_circuit.h"
#include "isisd/isis_lsp.h"
#include "isisd/isis_pdu.h"
#include "isisd/isis_network.h"
#include "isisd/isis_misc.h"
#include "isisd/isis_constants.h"
#include "isisd/isis_adjacency.h"
#include "isisd/isis_dr.h"
#include "isisd/isisd.h"
#include "isisd/isis_csm.h"
#include "isisd/isis_events.h"
#include "isisd/isis_srv6.h"
#include "isisd/isis_te.h"
#include "isisd/isis_mt.h"
#include "isisd/isis_errors.h"
#include "isisd/isis_tx_queue.h"
#include "isisd/isis_nb.h"
#include "isisd/isis_ldp_sync.h"
DEFINE_MTYPE_STATIC(ISISD, ISIS_CIRCUIT, "ISIS circuit");
DEFINE_QOBJ_TYPE(isis_circuit);
DEFINE_HOOK(isis_if_new_hook, (struct interface *ifp), (ifp));
/*
* Prototypes.
*/
int isis_if_new_hook(struct interface *);
int isis_if_delete_hook(struct interface *);
DEFINE_HOOK(isis_circuit_new_hook, (struct isis_circuit *circuit), (circuit));
DEFINE_HOOK(isis_circuit_del_hook, (struct isis_circuit *circuit), (circuit));
static void isis_circuit_enable(struct isis_circuit *circuit)
{
struct isis_area *area = circuit->area;
struct interface *ifp = circuit->interface;
if (!area) {
area = isis_area_lookup(circuit->tag, ifp->vrf->vrf_id);
if (area)
isis_area_add_circuit(area, circuit);
}
if (if_is_operative(ifp))
isis_csm_state_change(IF_UP_FROM_Z, circuit, ifp);
}
static void isis_circuit_disable(struct isis_circuit *circuit)
{
struct isis_area *area = circuit->area;
struct interface *ifp = circuit->interface;
if (if_is_operative(ifp))
isis_csm_state_change(IF_DOWN_FROM_Z, circuit, ifp);
if (area)
isis_area_del_circuit(area, circuit);
}
struct isis_circuit *isis_circuit_new(struct interface *ifp, const char *tag)
{
struct isis_circuit *circuit;
int i;
circuit = XCALLOC(MTYPE_ISIS_CIRCUIT, sizeof(struct isis_circuit));
circuit->tag = XSTRDUP(MTYPE_ISIS_CIRCUIT, tag);
/*
* Default values
*/
#ifndef FABRICD
circuit->is_type_config = yang_get_default_enum(
"/frr-interface:lib/interface/frr-isisd:isis/circuit-type");
circuit->flags = 0;
circuit->pad_hellos = yang_get_default_enum(
"/frr-interface:lib/interface/frr-isisd:isis/hello/padding");
circuit->hello_interval[0] = yang_get_default_uint32(
"/frr-interface:lib/interface/frr-isisd:isis/hello/interval/level-1");
circuit->hello_interval[1] = yang_get_default_uint32(
"/frr-interface:lib/interface/frr-isisd:isis/hello/interval/level-2");
circuit->hello_multiplier[0] = yang_get_default_uint32(
"/frr-interface:lib/interface/frr-isisd:isis/hello/multiplier/level-1");
circuit->hello_multiplier[1] = yang_get_default_uint32(
"/frr-interface:lib/interface/frr-isisd:isis/hello/multiplier/level-2");
circuit->csnp_interval[0] = yang_get_default_uint16(
"/frr-interface:lib/interface/frr-isisd:isis/csnp-interval/level-1");
circuit->csnp_interval[1] = yang_get_default_uint16(
"/frr-interface:lib/interface/frr-isisd:isis/csnp-interval/level-2");
circuit->psnp_interval[0] = yang_get_default_uint16(
"/frr-interface:lib/interface/frr-isisd:isis/psnp-interval/level-1");
circuit->psnp_interval[1] = yang_get_default_uint16(
"/frr-interface:lib/interface/frr-isisd:isis/psnp-interval/level-2");
circuit->priority[0] = yang_get_default_uint8(
"/frr-interface:lib/interface/frr-isisd:isis/priority/level-1");
circuit->priority[1] = yang_get_default_uint8(
"/frr-interface:lib/interface/frr-isisd:isis/priority/level-2");
circuit->metric[0] = yang_get_default_uint32(
"/frr-interface:lib/interface/frr-isisd:isis/metric/level-1");
circuit->metric[1] = yang_get_default_uint32(
"/frr-interface:lib/interface/frr-isisd:isis/metric/level-2");
circuit->te_metric[0] = yang_get_default_uint32(
"/frr-interface:lib/interface/frr-isisd:isis/metric/level-1");
circuit->te_metric[1] = yang_get_default_uint32(
"/frr-interface:lib/interface/frr-isisd:isis/metric/level-2");
for (i = 0; i < 2; i++) {
circuit->level_arg[i].level = i + 1;
circuit->level_arg[i].circuit = circuit;
}
#else
circuit->is_type_config = IS_LEVEL_1_AND_2;
circuit->flags = 0;
circuit->pad_hellos = ISIS_HELLO_PADDING_ALWAYS;
for (i = 0; i < 2; i++) {
circuit->hello_interval[i] = DEFAULT_HELLO_INTERVAL;
circuit->hello_multiplier[i] = DEFAULT_HELLO_MULTIPLIER;
circuit->csnp_interval[i] = DEFAULT_CSNP_INTERVAL;
circuit->psnp_interval[i] = DEFAULT_PSNP_INTERVAL;
circuit->priority[i] = DEFAULT_PRIORITY;
circuit->metric[i] = DEFAULT_CIRCUIT_METRIC;
circuit->te_metric[i] = DEFAULT_CIRCUIT_METRIC;
circuit->level_arg[i].level = i + 1;
circuit->level_arg[i].circuit = circuit;
}
#endif /* ifndef FABRICD */
circuit->is_type = circuit->is_type_config;
circuit_mt_init(circuit);
isis_lfa_excluded_ifaces_init(circuit, ISIS_LEVEL1);
isis_lfa_excluded_ifaces_init(circuit, ISIS_LEVEL2);
circuit->ldp_sync_info = ldp_sync_info_create();
circuit->ldp_sync_info->enabled = LDP_IGP_SYNC_ENABLED;
QOBJ_REG(circuit, isis_circuit);
isis_circuit_if_bind(circuit, ifp);
circuit->ip_addrs = list_new();
circuit->ipv6_link = list_new();
circuit->ipv6_non_link = list_new();
if (ifp->ifindex != IFINDEX_INTERNAL)
isis_circuit_enable(circuit);
return circuit;
}
void isis_circuit_del(struct isis_circuit *circuit)
{
if (!circuit)
return;
if (circuit->interface->ifindex != IFINDEX_INTERNAL)
isis_circuit_disable(circuit);
isis_circuit_if_unbind(circuit, circuit->interface);
QOBJ_UNREG(circuit);
ldp_sync_info_free(&circuit->ldp_sync_info);
circuit_mt_finish(circuit);
isis_lfa_excluded_ifaces_delete(circuit, ISIS_LEVEL1);
isis_lfa_excluded_ifaces_delete(circuit, ISIS_LEVEL2);
list_delete(&circuit->ip_addrs);
list_delete(&circuit->ipv6_link);
list_delete(&circuit->ipv6_non_link);
if (circuit->ext) {
isis_del_ext_subtlvs(circuit->ext);
circuit->ext = NULL;
}
XFREE(MTYPE_TMP, circuit->bfd_config.profile);
XFREE(MTYPE_ISIS_CIRCUIT, circuit->tag);
/* and lastly the circuit itself */
XFREE(MTYPE_ISIS_CIRCUIT, circuit);
return;
}
void isis_circuit_configure(struct isis_circuit *circuit,
struct isis_area *area)
{
assert(area);
circuit->isis = area->isis;
circuit->area = area;
/*
* Whenever the is-type of an area is changed, the is-type of each
* circuit
* in that area is updated to a non-empty subset of the area is-type.
* Inversely, when configuring a new circuit, this property should be
* ensured as well.
*/
if (area->is_type != IS_LEVEL_1_AND_2)
circuit->is_type = area->is_type;
/*
* Add the circuit into area
*/
listnode_add(area->circuit_list, circuit);
circuit->idx = flags_get_index(&area->flags);
hook_call(isis_circuit_new_hook, circuit);
return;
}
void isis_circuit_deconfigure(struct isis_circuit *circuit,
struct isis_area *area)
{
hook_call(isis_circuit_del_hook, circuit);
/* Free the index of SRM and SSN flags */
flags_free_index(&area->flags, circuit->idx);
circuit->idx = 0;
/* Reset IS type to configured */
circuit->is_type = circuit->is_type_config;
/* Remove circuit from area */
assert(circuit->area == area);
listnode_delete(area->circuit_list, circuit);
circuit->area = NULL;
circuit->isis = NULL;
return;
}
struct isis_circuit *circuit_scan_by_ifp(struct interface *ifp)
{
return (struct isis_circuit *)ifp->info;
}
DEFINE_HOOK(isis_circuit_add_addr_hook, (struct isis_circuit *circuit),
(circuit));
void isis_circuit_add_addr(struct isis_circuit *circuit,
struct connected *connected)
{
struct listnode *node;
struct prefix_ipv4 *ipv4;
struct prefix_ipv6 *ipv6;
if (connected->address->family == AF_INET) {
uint32_t addr = connected->address->u.prefix4.s_addr;
addr = ntohl(addr);
if (IPV4_NET0(addr) || IPV4_NET127(addr) || IN_CLASSD(addr))
return;
for (ALL_LIST_ELEMENTS_RO(circuit->ip_addrs, node, ipv4))
if (prefix_same((struct prefix *)ipv4,
connected->address))
return;
ipv4 = prefix_ipv4_new();
ipv4->prefixlen = connected->address->prefixlen;
ipv4->prefix = connected->address->u.prefix4;
listnode_add(circuit->ip_addrs, ipv4);
/* Update Local IP address parameter if MPLS TE is enable */
if (circuit->ext && circuit->area
&& IS_MPLS_TE(circuit->area->mta)) {
circuit->ext->local_addr.s_addr = ipv4->prefix.s_addr;
SET_SUBTLV(circuit->ext, EXT_LOCAL_ADDR);
}
if (circuit->area)
lsp_regenerate_schedule(circuit->area, circuit->is_type,
0);
#ifdef EXTREME_DEBUG
if (IS_DEBUG_EVENTS)
zlog_debug("Added IP address %pFX to circuit %s",
connected->address,
circuit->interface->name);
#endif /* EXTREME_DEBUG */
}
if (connected->address->family == AF_INET6) {
if (IN6_IS_ADDR_LOOPBACK(&connected->address->u.prefix6))
return;
for (ALL_LIST_ELEMENTS_RO(circuit->ipv6_link, node, ipv6))
if (prefix_same((struct prefix *)ipv6,
connected->address))
return;
for (ALL_LIST_ELEMENTS_RO(circuit->ipv6_non_link, node, ipv6))
if (prefix_same((struct prefix *)ipv6,
connected->address))
return;
ipv6 = prefix_ipv6_new();
ipv6->prefixlen = connected->address->prefixlen;
ipv6->prefix = connected->address->u.prefix6;
if (IN6_IS_ADDR_LINKLOCAL(&ipv6->prefix))
listnode_add(circuit->ipv6_link, ipv6);
else {
listnode_add(circuit->ipv6_non_link, ipv6);
/* Update Local IPv6 address param. if MPLS TE is on */
if (circuit->ext && circuit->area
&& IS_MPLS_TE(circuit->area->mta)) {
IPV6_ADDR_COPY(&circuit->ext->local_addr6,
&ipv6->prefix);
SET_SUBTLV(circuit->ext, EXT_LOCAL_ADDR6);
}
}
if (circuit->area)
lsp_regenerate_schedule(circuit->area, circuit->is_type,
0);
#ifdef EXTREME_DEBUG
if (IS_DEBUG_EVENTS)
zlog_debug("Added IPv6 address %pFX to circuit %s",
connected->address,
circuit->interface->name);
#endif /* EXTREME_DEBUG */
}
hook_call(isis_circuit_add_addr_hook, circuit);
return;
}
void isis_circuit_del_addr(struct isis_circuit *circuit,
struct connected *connected)
{
struct prefix_ipv4 *ipv4, *ip = NULL;
struct listnode *node;
struct prefix_ipv6 *ipv6, *ip6 = NULL;
int found = 0;
if (connected->address->family == AF_INET) {
ipv4 = prefix_ipv4_new();
ipv4->prefixlen = connected->address->prefixlen;
ipv4->prefix = connected->address->u.prefix4;
for (ALL_LIST_ELEMENTS_RO(circuit->ip_addrs, node, ip))
if (prefix_same((struct prefix *)ip,
(struct prefix *)ipv4))
break;
if (ip) {
listnode_delete(circuit->ip_addrs, ip);
prefix_ipv4_free(&ip);
if (circuit->area)
lsp_regenerate_schedule(circuit->area,
circuit->is_type, 0);
} else {
zlog_warn(
"Nonexistent ip address %pFX removal attempt from circuit %s",
connected->address, circuit->interface->name);
zlog_warn("Current ip addresses on %s:",
circuit->interface->name);
for (ALL_LIST_ELEMENTS_RO(circuit->ip_addrs, node,
ip)) {
zlog_warn(" %pFX", ip);
}
zlog_warn("End of addresses");
}
prefix_ipv4_free(&ipv4);
}
if (connected->address->family == AF_INET6) {
ipv6 = prefix_ipv6_new();
ipv6->prefixlen = connected->address->prefixlen;
ipv6->prefix = connected->address->u.prefix6;
if (IN6_IS_ADDR_LINKLOCAL(&ipv6->prefix)) {
for (ALL_LIST_ELEMENTS_RO(circuit->ipv6_link, node,
ip6)) {
if (prefix_same((struct prefix *)ip6,
(struct prefix *)ipv6))
break;
}
if (ip6) {
listnode_delete(circuit->ipv6_link, ip6);
prefix_ipv6_free(&ip6);
found = 1;
}
} else {
for (ALL_LIST_ELEMENTS_RO(circuit->ipv6_non_link, node,
ip6)) {
if (prefix_same((struct prefix *)ip6,
(struct prefix *)ipv6))
break;
}
if (ip6) {
listnode_delete(circuit->ipv6_non_link, ip6);
prefix_ipv6_free(&ip6);
found = 1;
}
}
if (!found) {
zlog_warn(
"Nonexistent ip address %pFX removal attempt from circuit %s",
connected->address, circuit->interface->name);
zlog_warn("Current ip addresses on %s:",
circuit->interface->name);
for (ALL_LIST_ELEMENTS_RO(circuit->ipv6_link, node,
ip6))
zlog_warn(" %pFX", (struct prefix *)ip6);
zlog_warn(" -----");
for (ALL_LIST_ELEMENTS_RO(circuit->ipv6_non_link, node,
ip6))
zlog_warn(" %pFX", (struct prefix *)ip6);
zlog_warn("End of addresses");
} else if (circuit->area)
lsp_regenerate_schedule(circuit->area, circuit->is_type,
0);
prefix_ipv6_free(&ipv6);
}
return;
}
static uint8_t isis_circuit_id_gen(struct isis *isis, struct interface *ifp)
{
/* Circuit ids MUST be unique for any broadcast circuits. Otherwise,
* Pseudo-Node LSPs cannot be generated correctly.
*
* Currently, allocate one circuit ID for any circuit, limiting the total
* numer of circuits IS-IS can run on to 255.
*
* We should revisit this when implementing 3-way adjacencies for p2p, since
* we then have extended interface IDs available.
*/
uint8_t id = ifp->ifindex;
unsigned int i;
for (i = 0; i < 256; i++) {
if (id && !_ISIS_CHECK_FLAG(isis->circuit_ids_used, id))
break;
id++;
}
if (i == 256) {
zlog_warn("Could not allocate a circuit id for '%s'",
ifp->name);
return 0;
}
_ISIS_SET_FLAG(isis->circuit_ids_used, id);
return id;
}
void isis_circuit_if_add(struct isis_circuit *circuit, struct interface *ifp)
{
struct connected *conn;
if (if_is_broadcast(ifp)) {
if (fabricd || circuit->circ_type_config == CIRCUIT_T_P2P)
circuit->circ_type = CIRCUIT_T_P2P;
else
circuit->circ_type = CIRCUIT_T_BROADCAST;
} else if (if_is_pointopoint(ifp)) {
circuit->circ_type = CIRCUIT_T_P2P;
} else if (if_is_loopback(ifp)) {
circuit->circ_type = CIRCUIT_T_LOOPBACK;
circuit->is_passive = 1;
} else {
/* It's normal in case of loopback etc. */
if (IS_DEBUG_EVENTS)
zlog_debug("%s: unsupported media", __func__);
circuit->circ_type = CIRCUIT_T_UNKNOWN;
}
frr_each (if_connected, ifp->connected, conn)
isis_circuit_add_addr(circuit, conn);
}
void isis_circuit_if_del(struct isis_circuit *circuit, struct interface *ifp)
{
struct connected *conn;
assert(circuit->interface == ifp);
/* destroy addresses */
frr_each_safe (if_connected, ifp->connected, conn)
isis_circuit_del_addr(circuit, conn);
circuit->circ_type = CIRCUIT_T_UNKNOWN;
}
void isis_circuit_if_bind(struct isis_circuit *circuit, struct interface *ifp)
{
assert(circuit != NULL);
assert(ifp != NULL);
if (circuit->interface)
assert(circuit->interface == ifp);
else
circuit->interface = ifp;
if (ifp->info)
assert(ifp->info == circuit);
else
ifp->info = circuit;
}
void isis_circuit_if_unbind(struct isis_circuit *circuit, struct interface *ifp)
{
assert(circuit != NULL);
assert(ifp != NULL);
assert(circuit->interface == ifp);
assert(ifp->info == circuit);
circuit->interface = NULL;
ifp->info = NULL;
}
static void isis_circuit_update_all_srmflags(struct isis_circuit *circuit,
int is_set)
{
struct isis_area *area;
struct isis_lsp *lsp;
int level;
assert(circuit);
area = circuit->area;
assert(area);
for (level = ISIS_LEVEL1; level <= ISIS_LEVEL2; level++) {
if (!(level & circuit->is_type))
continue;
if (!lspdb_count(&area->lspdb[level - 1]))
continue;
frr_each (lspdb, &area->lspdb[level - 1], lsp) {
if (is_set) {
isis_tx_queue_add(circuit->tx_queue, lsp,
TX_LSP_NORMAL);
} else {
isis_tx_queue_del(circuit->tx_queue, lsp);
}
}
}
}
size_t isis_circuit_pdu_size(struct isis_circuit *circuit)
{
return ISO_MTU(circuit);
}
static bool isis_circuit_lfa_enabled(struct isis_circuit *circuit, int level)
{
return (circuit->lfa_protection[level - 1] ||
circuit->rlfa_protection[level - 1] ||
circuit->tilfa_protection[level - 1]);
}
void isis_circuit_switchover_routes(struct isis_circuit *circuit, int family,
union g_addr *nexthop_ip, ifindex_t ifindex)
{
char is_type;
if (!circuit->area)
return;
is_type = circuit->area->is_type;
if ((is_type == IS_LEVEL_1 || is_type == IS_LEVEL_1_AND_2) &&
isis_circuit_lfa_enabled(circuit, IS_LEVEL_1))
isis_area_switchover_routes(circuit->area, family, nexthop_ip,
ifindex, IS_LEVEL_1);
if ((is_type == IS_LEVEL_2 || is_type == IS_LEVEL_1_AND_2) &&
isis_circuit_lfa_enabled(circuit, IS_LEVEL_2))
isis_area_switchover_routes(circuit->area, family, nexthop_ip,
ifindex, IS_LEVEL_2);
}
void isis_circuit_stream(struct isis_circuit *circuit, struct stream **stream)
{
size_t stream_size = isis_circuit_pdu_size(circuit);
if (!*stream) {
*stream = stream_new(stream_size);
} else {
if (STREAM_SIZE(*stream) != stream_size)
stream_resize_inplace(stream, stream_size);
stream_reset(*stream);
}
}
void isis_circuit_prepare(struct isis_circuit *circuit)
{
#if ISIS_METHOD != ISIS_METHOD_DLPI
event_add_read(master, isis_receive, circuit, circuit->fd,
&circuit->t_read);
#else
event_add_timer_msec(master, isis_receive, circuit,
listcount(circuit->area->circuit_list) * 100,
&circuit->t_read);
#endif
}
int isis_circuit_up(struct isis_circuit *circuit)
{
int retv;
/* Set the flags for all the lsps of the circuit. */
isis_circuit_update_all_srmflags(circuit, 1);
if (circuit->state == C_STATE_UP)
return ISIS_OK;
if (circuit->is_passive) {
circuit->last_uptime = time(NULL);
/* make sure the union fields are initialized, else we
* could end with garbage values from a previous circuit
* type, which would then cause a segfault when building
* LSPs or computing the SPF tree
*/
if (circuit->circ_type == CIRCUIT_T_BROADCAST) {
circuit->u.bc.adjdb[0] = list_new();
circuit->u.bc.adjdb[1] = list_new();
} else if (circuit->circ_type == CIRCUIT_T_P2P) {
circuit->u.p2p.neighbor = NULL;
}
return ISIS_OK;
}
if (circuit->area->lsp_mtu > isis_circuit_pdu_size(circuit)) {
flog_err(
EC_ISIS_CONFIG,
"Interface MTU %zu on %s is too low to support area lsp mtu %u!",
isis_circuit_pdu_size(circuit),
circuit->interface->name, circuit->area->lsp_mtu);
/* Allow ISIS to continue configuration. With this
* configuration failure ISIS will attempt to send lsp
* packets but will fail until the mtu is configured properly
*/
}
if (circuit->circ_type == CIRCUIT_T_BROADCAST) {
circuit->circuit_id =
isis_circuit_id_gen(circuit->isis, circuit->interface);
if (!circuit->circuit_id) {
flog_err(
EC_ISIS_CONFIG,
"There are already 255 broadcast circuits active!");
return ISIS_ERROR;
}
/*
* Get the Hardware Address
*/
if (circuit->interface->hw_addr_len != ETH_ALEN) {
zlog_warn("unsupported link layer");
} else {
memcpy(circuit->u.bc.snpa, circuit->interface->hw_addr,
ETH_ALEN);
}
#ifdef EXTREME_DEGUG
if (IS_DEBUG_EVENTS)
zlog_debug("%s: if_id %d, isomtu %d snpa %pSY",
__func__, circuit->interface->ifindex,
ISO_MTU(circuit), circuit->u.bc.snpa);
#endif /* EXTREME_DEBUG */
circuit->u.bc.adjdb[0] = list_new();
circuit->u.bc.adjdb[1] = list_new();
/*
* ISO 10589 - 8.4.1 Enabling of broadcast circuits
*/
/* initilizing the hello sending threads
* for a broadcast IF
*/
/* 8.4.1 a) commence sending of IIH PDUs */
for (int level = ISIS_LEVEL1; level <= ISIS_LEVEL2; level++) {
if (!(circuit->is_type & level))
continue;
send_hello_sched(circuit, level, TRIGGERED_IIH_DELAY);
circuit->u.bc.lan_neighs[level - 1] = list_new();
event_add_timer(master, isis_run_dr,
&circuit->level_arg[level - 1],
2 * circuit->hello_interval[level - 1],
&circuit->u.bc.t_run_dr[level - 1]);
}
/* 8.4.1 b) FIXME: solicit ES - 8.4.6 */
/* 8.4.1 c) FIXME: listen for ESH PDUs */
} else if (circuit->circ_type == CIRCUIT_T_P2P) {
/* initializing the hello send threads
* for a ptp IF
*/
circuit->u.p2p.neighbor = NULL;
send_hello_sched(circuit, 0, TRIGGERED_IIH_DELAY);
}
/* initializing PSNP timers */
if (circuit->is_type & IS_LEVEL_1)
event_add_timer(
master, send_l1_psnp, circuit,
isis_jitter(circuit->psnp_interval[0], PSNP_JITTER),
&circuit->t_send_psnp[0]);
if (circuit->is_type & IS_LEVEL_2)
event_add_timer(
master, send_l2_psnp, circuit,
isis_jitter(circuit->psnp_interval[1], PSNP_JITTER),
&circuit->t_send_psnp[1]);
/* unified init for circuits; ignore warnings below this level */
retv = isis_sock_init(circuit);
if (retv != ISIS_OK) {
isis_circuit_down(circuit);
return retv;
}
/* initialize the circuit streams after opening connection */
isis_circuit_stream(circuit, &circuit->rcv_stream);
isis_circuit_stream(circuit, &circuit->snd_stream);
isis_circuit_prepare(circuit);
circuit->tx_queue = isis_tx_queue_new(circuit, send_lsp);
circuit->last_uptime = time(NULL);
if (circuit->area->mta && circuit->area->mta->status)
isis_link_params_update(circuit, circuit->interface);
isis_if_ldp_sync_enable(circuit);
#ifndef FABRICD
/* send northbound notification */
isis_notif_if_state_change(circuit, false);
#endif /* ifndef FABRICD */
return ISIS_OK;
}
void isis_circuit_down(struct isis_circuit *circuit)
{
#ifndef FABRICD
/* send northbound notification */
isis_notif_if_state_change(circuit, true);
#endif /* ifndef FABRICD */
isis_if_ldp_sync_disable(circuit);
/* log adjacency changes if configured to do so */
if (circuit->area->log_adj_changes) {
struct isis_adjacency *adj = NULL;
if (circuit->circ_type == CIRCUIT_T_P2P) {
adj = circuit->u.p2p.neighbor;
if (adj)
isis_log_adj_change(
adj, adj->adj_state, ISIS_ADJ_DOWN,
"circuit is being brought down");
} else if (circuit->circ_type == CIRCUIT_T_BROADCAST) {
struct list *adj_list;
struct listnode *node;
if (circuit->u.bc.adjdb[0]) {
adj_list = list_new();
isis_adj_build_up_list(circuit->u.bc.adjdb[0],
adj_list);
for (ALL_LIST_ELEMENTS_RO(adj_list, node, adj))
isis_log_adj_change(
adj, adj->adj_state,
ISIS_ADJ_DOWN,
"circuit is being brought down");
list_delete(&adj_list);
}
if (circuit->u.bc.adjdb[1]) {
adj_list = list_new();
isis_adj_build_up_list(circuit->u.bc.adjdb[1],
adj_list);
for (ALL_LIST_ELEMENTS_RO(adj_list, node, adj))
isis_log_adj_change(
adj, adj->adj_state,
ISIS_ADJ_DOWN,
"circuit is being brought down");
list_delete(&adj_list);
}
}
}
/* Clear the flags for all the lsps of the circuit. */
isis_circuit_update_all_srmflags(circuit, 0);
if (circuit->circ_type == CIRCUIT_T_BROADCAST) {
/* destroy neighbour lists */
if (circuit->u.bc.lan_neighs[0]) {
list_delete(&circuit->u.bc.lan_neighs[0]);
circuit->u.bc.lan_neighs[0] = NULL;
}
if (circuit->u.bc.lan_neighs[1]) {
list_delete(&circuit->u.bc.lan_neighs[1]);
circuit->u.bc.lan_neighs[1] = NULL;
}
/* destroy adjacency databases */
if (circuit->u.bc.adjdb[0]) {
circuit->u.bc.adjdb[0]->del = isis_delete_adj;
list_delete(&circuit->u.bc.adjdb[0]);
circuit->u.bc.adjdb[0] = NULL;
}
if (circuit->u.bc.adjdb[1]) {
circuit->u.bc.adjdb[1]->del = isis_delete_adj;
list_delete(&circuit->u.bc.adjdb[1]);
circuit->u.bc.adjdb[1] = NULL;
}
if (circuit->u.bc.is_dr[0]) {
isis_dr_resign(circuit, 1);
circuit->u.bc.is_dr[0] = 0;
}
memset(circuit->u.bc.l1_desig_is, 0, ISIS_SYS_ID_LEN + 1);
if (circuit->u.bc.is_dr[1]) {
isis_dr_resign(circuit, 2);
circuit->u.bc.is_dr[1] = 0;
}
memset(circuit->u.bc.l2_desig_is, 0, ISIS_SYS_ID_LEN + 1);
memset(circuit->u.bc.snpa, 0, ETH_ALEN);
EVENT_OFF(circuit->u.bc.t_send_lan_hello[0]);
EVENT_OFF(circuit->u.bc.t_send_lan_hello[1]);
EVENT_OFF(circuit->u.bc.t_run_dr[0]);
EVENT_OFF(circuit->u.bc.t_run_dr[1]);
EVENT_OFF(circuit->u.bc.t_refresh_pseudo_lsp[0]);
EVENT_OFF(circuit->u.bc.t_refresh_pseudo_lsp[1]);
circuit->lsp_regenerate_pending[0] = 0;
circuit->lsp_regenerate_pending[1] = 0;
_ISIS_CLEAR_FLAG(circuit->isis->circuit_ids_used,
circuit->circuit_id);
circuit->circuit_id = 0;
} else if (circuit->circ_type == CIRCUIT_T_P2P) {
isis_delete_adj(circuit->u.p2p.neighbor);
circuit->u.p2p.neighbor = NULL;
EVENT_OFF(circuit->u.p2p.t_send_p2p_hello);
}
/*
* All adjacencies have to be gone, delete snmp list
* and reset snmpd idx generator
*/
if (circuit->snmp_adj_list != NULL)
list_delete(&circuit->snmp_adj_list);
circuit->snmp_adj_idx_gen = 0;
/* Cancel all active threads */
EVENT_OFF(circuit->t_send_csnp[0]);
EVENT_OFF(circuit->t_send_csnp[1]);
EVENT_OFF(circuit->t_send_psnp[0]);
EVENT_OFF(circuit->t_send_psnp[1]);
EVENT_OFF(circuit->t_read);
if (circuit->tx_queue) {
isis_tx_queue_free(circuit->tx_queue);
circuit->tx_queue = NULL;
}
/* send one gratuitous hello to spead up convergence */
if (circuit->state == C_STATE_UP) {
if (circuit->is_type & IS_LEVEL_1)
send_hello(circuit, IS_LEVEL_1);
if (circuit->is_type & IS_LEVEL_2)
send_hello(circuit, IS_LEVEL_2);
}
circuit->upadjcount[0] = 0;
circuit->upadjcount[1] = 0;
/* close the socket */
if (circuit->fd) {
close(circuit->fd);
circuit->fd = 0;
}
if (circuit->rcv_stream != NULL) {
stream_free(circuit->rcv_stream);
circuit->rcv_stream = NULL;
}
if (circuit->snd_stream != NULL) {
stream_free(circuit->snd_stream);
circuit->snd_stream = NULL;
}
event_cancel_event(master, circuit);
return;
}
void circuit_update_nlpids(struct isis_circuit *circuit)
{
circuit->nlpids.count = 0;
if (circuit->ip_router) {
circuit->nlpids.nlpids[0] = NLPID_IP;
circuit->nlpids.count++;
}
if (circuit->ipv6_router) {
circuit->nlpids.nlpids[circuit->nlpids.count] = NLPID_IPV6;
circuit->nlpids.count++;
}
return;
}
void isis_circuit_print_json(struct isis_circuit *circuit,
struct json_object *json, char detail)
{
int level;
json_object *iface_json, *ipv4_addr_json, *ipv6_link_json,
*ipv6_non_link_json, *hold_json, *lan_prio_json, *levels_json,
*level_json;
char buf_prx[INET6_BUFSIZ];
char buf[255];
snprintfrr(buf, sizeof(buf), "0x%x", circuit->circuit_id);
if (detail == ISIS_UI_LEVEL_BRIEF) {
iface_json = json_object_new_object();
json_object_object_add(json, "interface", iface_json);
json_object_string_add(iface_json, "name",
circuit->interface->name);
json_object_string_add(iface_json, "circuit-id", buf);
json_object_string_add(iface_json, "state",
circuit_state2string(circuit->state));
json_object_string_add(iface_json, "type",
circuit_type2string(circuit->circ_type));
json_object_string_add(iface_json, "level",
circuit_t2string(circuit->is_type));
}
if (detail == ISIS_UI_LEVEL_DETAIL) {
struct listnode *node;
struct prefix *ip_addr;
iface_json = json_object_new_object();
json_object_object_add(json, "interface", iface_json);
json_object_string_add(iface_json, "name",
circuit->interface->name);
json_object_string_add(iface_json, "state",
circuit_state2string(circuit->state));
if (circuit->is_passive)
json_object_string_add(iface_json, "is-passive",
"passive");
else
json_object_string_add(iface_json, "is-passive",
"active");
json_object_string_add(iface_json, "circuit-id", buf);
json_object_string_add(iface_json, "type",
circuit_type2string(circuit->circ_type));
json_object_string_add(iface_json, "level",
circuit_t2string(circuit->is_type));
if (circuit->circ_type == CIRCUIT_T_BROADCAST)
json_object_string_addf(iface_json, "snpa", "%pSY",
circuit->u.bc.snpa);
levels_json = json_object_new_array();
json_object_object_add(iface_json, "levels", levels_json);