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ospf_interface.c
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/*
* OSPF Interface functions.
* Copyright (C) 1999, 2000 Toshiaki Takada
*
* This file is part of GNU Zebra.
*
* GNU Zebra 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, or (at your
* option) any later version.
*
* GNU Zebra 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 "prefix.h"
#include "if.h"
#include "table.h"
#include "memory.h"
#include "command.h"
#include "stream.h"
#include "log.h"
#include "zclient.h"
#include "bfd.h"
#include "ldp_sync.h"
#include "ospfd/ospfd.h"
#include "ospfd/ospf_spf.h"
#include "ospfd/ospf_interface.h"
#include "ospfd/ospf_ism.h"
#include "ospfd/ospf_asbr.h"
#include "ospfd/ospf_lsa.h"
#include "ospfd/ospf_lsdb.h"
#include "ospfd/ospf_neighbor.h"
#include "ospfd/ospf_nsm.h"
#include "ospfd/ospf_packet.h"
#include "ospfd/ospf_abr.h"
#include "ospfd/ospf_network.h"
#include "ospfd/ospf_dump.h"
#include "ospfd/ospf_ldp_sync.h"
DEFINE_QOBJ_TYPE(ospf_interface)
DEFINE_HOOK(ospf_vl_add, (struct ospf_vl_data * vd), (vd))
DEFINE_HOOK(ospf_vl_delete, (struct ospf_vl_data * vd), (vd))
DEFINE_HOOK(ospf_if_update, (struct interface * ifp), (ifp))
DEFINE_HOOK(ospf_if_delete, (struct interface * ifp), (ifp))
int ospf_interface_neighbor_count(struct ospf_interface *oi)
{
int count = 0;
struct route_node *rn;
struct ospf_neighbor *nbr = NULL;
for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) {
nbr = rn->info;
if (nbr) {
/* Do not show myself. */
if (nbr == oi->nbr_self)
continue;
/* Down state is not shown. */
if (nbr->state == NSM_Down)
continue;
count++;
}
}
return count;
}
int ospf_if_get_output_cost(struct ospf_interface *oi)
{
/* If all else fails, use default OSPF cost */
uint32_t cost;
uint32_t bw, refbw;
/* if LDP-IGP Sync is running on interface set cost so interface
* is used only as last resort
*/
if (ldp_sync_if_is_enabled(IF_DEF_PARAMS(oi->ifp)->ldp_sync_info))
return (LDP_OSPF_LSINFINITY);
/* ifp speed and bw can be 0 in some platforms, use ospf default bw
if bw is configured under interface it would be used.
*/
if (!oi->ifp->bandwidth && oi->ifp->speed)
bw = oi->ifp->speed;
else
bw = oi->ifp->bandwidth ? oi->ifp->bandwidth
: OSPF_DEFAULT_BANDWIDTH;
refbw = oi->ospf->ref_bandwidth;
/* A specifed ip ospf cost overrides a calculated one. */
if (OSPF_IF_PARAM_CONFIGURED(IF_DEF_PARAMS(oi->ifp), output_cost_cmd)
|| OSPF_IF_PARAM_CONFIGURED(oi->params, output_cost_cmd))
cost = OSPF_IF_PARAM(oi, output_cost_cmd);
/* See if a cost can be calculated from the zebra processes
interface bandwidth field. */
else {
cost = (uint32_t)((double)refbw / (double)bw + (double)0.5);
if (cost < 1)
cost = 1;
else if (cost > 65535)
cost = 65535;
}
return cost;
}
void ospf_if_recalculate_output_cost(struct interface *ifp)
{
uint32_t newcost;
struct route_node *rn;
for (rn = route_top(IF_OIFS(ifp)); rn; rn = route_next(rn)) {
struct ospf_interface *oi;
if ((oi = rn->info) == NULL)
continue;
newcost = ospf_if_get_output_cost(oi);
/* Is actual output cost changed? */
if (oi->output_cost != newcost) {
oi->output_cost = newcost;
ospf_router_lsa_update_area(oi->area);
}
}
}
/* Simulate down/up on the interface. This is needed, for example, when
the MTU changes. */
void ospf_if_reset(struct interface *ifp)
{
struct route_node *rn;
for (rn = route_top(IF_OIFS(ifp)); rn; rn = route_next(rn)) {
struct ospf_interface *oi;
if ((oi = rn->info) == NULL)
continue;
ospf_if_down(oi);
ospf_if_up(oi);
}
}
void ospf_if_reset_variables(struct ospf_interface *oi)
{
/* Set default values. */
/* don't clear this flag. oi->flag = OSPF_IF_DISABLE; */
if (oi->vl_data)
oi->type = OSPF_IFTYPE_VIRTUALLINK;
else
/* preserve network-type */
if (oi->type != OSPF_IFTYPE_NBMA)
oi->type = OSPF_IFTYPE_BROADCAST;
oi->state = ISM_Down;
oi->crypt_seqnum = 0;
/* This must be short, (less than RxmtInterval)
- RFC 2328 Section 13.5 para 3. Set to 1 second to avoid Acks being
held back for too long - MAG */
oi->v_ls_ack = 1;
}
/* lookup oi for specified prefix/ifp */
struct ospf_interface *ospf_if_table_lookup(struct interface *ifp,
struct prefix *prefix)
{
struct prefix p;
struct route_node *rn;
struct ospf_interface *rninfo = NULL;
p = *prefix;
p.prefixlen = IPV4_MAX_PREFIXLEN;
/* route_node_get implicitely locks */
if ((rn = route_node_lookup(IF_OIFS(ifp), &p))) {
rninfo = (struct ospf_interface *)rn->info;
route_unlock_node(rn);
}
return rninfo;
}
static void ospf_add_to_if(struct interface *ifp, struct ospf_interface *oi)
{
struct route_node *rn;
struct prefix p;
p = *oi->address;
p.prefixlen = IPV4_MAX_PREFIXLEN;
apply_mask(&p);
rn = route_node_get(IF_OIFS(ifp), &p);
/* rn->info should either be NULL or equal to this oi
* as route_node_get may return an existing node
*/
assert(!rn->info || rn->info == oi);
rn->info = oi;
}
static void ospf_delete_from_if(struct interface *ifp,
struct ospf_interface *oi)
{
struct route_node *rn;
struct prefix p;
p = *oi->address;
p.prefixlen = IPV4_MAX_PREFIXLEN;
rn = route_node_lookup(IF_OIFS(oi->ifp), &p);
assert(rn);
assert(rn->info);
rn->info = NULL;
route_unlock_node(rn);
route_unlock_node(rn);
}
struct ospf_interface *ospf_if_new(struct ospf *ospf, struct interface *ifp,
struct prefix *p)
{
struct ospf_interface *oi;
oi = ospf_if_table_lookup(ifp, p);
if (oi)
return oi;
oi = XCALLOC(MTYPE_OSPF_IF, sizeof(struct ospf_interface));
oi->obuf = ospf_fifo_new();
/* Set zebra interface pointer. */
oi->ifp = ifp;
oi->address = p;
ospf_add_to_if(ifp, oi);
listnode_add(ospf->oiflist, oi);
/* Initialize neighbor list. */
oi->nbrs = route_table_init();
/* Initialize static neighbor list. */
oi->nbr_nbma = list_new();
/* Initialize Link State Acknowledgment list. */
oi->ls_ack = list_new();
oi->ls_ack_direct.ls_ack = list_new();
/* Set default values. */
ospf_if_reset_variables(oi);
/* Set pseudo neighbor to Null */
oi->nbr_self = NULL;
oi->ls_upd_queue = route_table_init();
oi->t_ls_upd_event = NULL;
oi->t_ls_ack_direct = NULL;
oi->crypt_seqnum = time(NULL);
ospf_opaque_type9_lsa_init(oi);
oi->ospf = ospf;
QOBJ_REG(oi, ospf_interface);
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("%s: ospf interface %s vrf %s id %u created",
__func__, ifp->name, ospf_get_name(ospf),
ospf->vrf_id);
return oi;
}
/* Restore an interface to its pre UP state
Used from ism_interface_down only */
void ospf_if_cleanup(struct ospf_interface *oi)
{
struct route_node *rn;
struct listnode *node, *nnode;
struct ospf_neighbor *nbr;
struct ospf_nbr_nbma *nbr_nbma;
struct ospf_lsa *lsa;
/* oi->nbrs and oi->nbr_nbma should be deleted on InterfaceDown event */
/* delete all static neighbors attached to this interface */
for (ALL_LIST_ELEMENTS(oi->nbr_nbma, node, nnode, nbr_nbma)) {
OSPF_POLL_TIMER_OFF(nbr_nbma->t_poll);
if (nbr_nbma->nbr) {
nbr_nbma->nbr->nbr_nbma = NULL;
nbr_nbma->nbr = NULL;
}
nbr_nbma->oi = NULL;
listnode_delete(oi->nbr_nbma, nbr_nbma);
}
/* send Neighbor event KillNbr to all associated neighbors. */
for (rn = route_top(oi->nbrs); rn; rn = route_next(rn))
if ((nbr = rn->info) != NULL)
if (nbr != oi->nbr_self)
OSPF_NSM_EVENT_EXECUTE(nbr, NSM_KillNbr);
/* Cleanup Link State Acknowlegdment list. */
for (ALL_LIST_ELEMENTS(oi->ls_ack, node, nnode, lsa))
ospf_lsa_unlock(&lsa); /* oi->ls_ack */
list_delete_all_node(oi->ls_ack);
oi->crypt_seqnum = 0;
/* Empty link state update queue */
ospf_ls_upd_queue_empty(oi);
/* Reset pseudo neighbor. */
ospf_nbr_self_reset(oi, oi->ospf->router_id);
}
void ospf_if_free(struct ospf_interface *oi)
{
ospf_if_down(oi);
ospf_fifo_free(oi->obuf);
assert(oi->state == ISM_Down);
ospf_opaque_type9_lsa_term(oi);
QOBJ_UNREG(oi);
/* Free Pseudo Neighbour */
ospf_nbr_delete(oi->nbr_self);
route_table_finish(oi->nbrs);
route_table_finish(oi->ls_upd_queue);
/* Free any lists that should be freed */
list_delete(&oi->nbr_nbma);
list_delete(&oi->ls_ack);
list_delete(&oi->ls_ack_direct.ls_ack);
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("%s: ospf interface %s vrf %s id %u deleted",
__func__, oi->ifp->name,
ospf_vrf_id_to_name(oi->ifp->vrf_id),
oi->ifp->vrf_id);
ospf_delete_from_if(oi->ifp, oi);
listnode_delete(oi->ospf->oiflist, oi);
listnode_delete(oi->area->oiflist, oi);
thread_cancel_event(master, oi);
memset(oi, 0, sizeof(*oi));
XFREE(MTYPE_OSPF_IF, oi);
}
int ospf_if_is_up(struct ospf_interface *oi)
{
return if_is_up(oi->ifp);
}
struct ospf_interface *ospf_if_exists(struct ospf_interface *oic)
{
struct listnode *node;
struct ospf *ospf;
struct ospf_interface *oi;
if (!oic)
return NULL;
ospf = oic->ospf;
if (ospf == NULL)
return NULL;
for (ALL_LIST_ELEMENTS_RO(ospf->oiflist, node, oi))
if (oi == oic)
return oi;
return NULL;
}
/* Lookup OSPF interface by router LSA posistion */
struct ospf_interface *ospf_if_lookup_by_lsa_pos(struct ospf_area *area,
int lsa_pos)
{
struct listnode *node;
struct ospf_interface *oi;
for (ALL_LIST_ELEMENTS_RO(area->oiflist, node, oi)) {
if (lsa_pos >= oi->lsa_pos_beg && lsa_pos < oi->lsa_pos_end)
return oi;
}
return NULL;
}
struct ospf_interface *ospf_if_lookup_by_local_addr(struct ospf *ospf,
struct interface *ifp,
struct in_addr address)
{
struct listnode *node;
struct ospf_interface *oi;
for (ALL_LIST_ELEMENTS_RO(ospf->oiflist, node, oi))
if (oi->type != OSPF_IFTYPE_VIRTUALLINK) {
if (ifp && oi->ifp != ifp)
continue;
if (IPV4_ADDR_SAME(&address, &oi->address->u.prefix4))
return oi;
}
return NULL;
}
struct ospf_interface *ospf_if_lookup_by_prefix(struct ospf *ospf,
struct prefix_ipv4 *p)
{
struct listnode *node;
struct ospf_interface *oi;
/* Check each Interface. */
for (ALL_LIST_ELEMENTS_RO(ospf->oiflist, node, oi)) {
if (oi->type != OSPF_IFTYPE_VIRTUALLINK) {
struct prefix ptmp;
prefix_copy(&ptmp, CONNECTED_PREFIX(oi->connected));
apply_mask(&ptmp);
if (prefix_same(&ptmp, (struct prefix *)p))
return oi;
}
}
return NULL;
}
/* determine receiving interface by ifp and source address */
struct ospf_interface *ospf_if_lookup_recv_if(struct ospf *ospf,
struct in_addr src,
struct interface *ifp)
{
struct route_node *rn;
struct prefix_ipv4 addr;
struct ospf_interface *oi, *match;
addr.family = AF_INET;
addr.prefix = src;
addr.prefixlen = IPV4_MAX_BITLEN;
match = NULL;
for (rn = route_top(IF_OIFS(ifp)); rn; rn = route_next(rn)) {
oi = rn->info;
if (!oi) /* oi can be NULL for PtP aliases */
continue;
if (oi->type == OSPF_IFTYPE_VIRTUALLINK)
continue;
if (if_is_loopback(oi->ifp) || if_is_vrf(oi->ifp))
continue;
if (CHECK_FLAG(oi->connected->flags, ZEBRA_IFA_UNNUMBERED))
match = oi;
else if (prefix_match(CONNECTED_PREFIX(oi->connected),
(struct prefix *)&addr)) {
if ((match == NULL) || (match->address->prefixlen
< oi->address->prefixlen))
match = oi;
}
}
return match;
}
static void ospf_if_reset_stats(struct ospf_interface *oi)
{
oi->hello_in = oi->hello_out = 0;
oi->db_desc_in = oi->db_desc_out = 0;
oi->ls_req_in = oi->ls_req_out = 0;
oi->ls_upd_in = oi->ls_upd_out = 0;
oi->ls_ack_in = oi->ls_ack_out = 0;
}
void ospf_if_stream_unset(struct ospf_interface *oi)
{
struct ospf *ospf = oi->ospf;
/* flush the interface packet queue */
ospf_fifo_flush(oi->obuf);
/*reset protocol stats */
ospf_if_reset_stats(oi);
if (oi->on_write_q) {
listnode_delete(ospf->oi_write_q, oi);
if (list_isempty(ospf->oi_write_q))
OSPF_TIMER_OFF(ospf->t_write);
oi->on_write_q = 0;
}
}
static struct ospf_if_params *ospf_new_if_params(void)
{
struct ospf_if_params *oip;
oip = XCALLOC(MTYPE_OSPF_IF_PARAMS, sizeof(struct ospf_if_params));
UNSET_IF_PARAM(oip, output_cost_cmd);
UNSET_IF_PARAM(oip, transmit_delay);
UNSET_IF_PARAM(oip, retransmit_interval);
UNSET_IF_PARAM(oip, passive_interface);
UNSET_IF_PARAM(oip, v_hello);
UNSET_IF_PARAM(oip, fast_hello);
UNSET_IF_PARAM(oip, v_wait);
UNSET_IF_PARAM(oip, priority);
UNSET_IF_PARAM(oip, type);
UNSET_IF_PARAM(oip, auth_simple);
UNSET_IF_PARAM(oip, auth_crypt);
UNSET_IF_PARAM(oip, auth_type);
UNSET_IF_PARAM(oip, if_area);
oip->auth_crypt = list_new();
oip->network_lsa_seqnum = htonl(OSPF_INITIAL_SEQUENCE_NUMBER);
oip->is_v_wait_set = false;
return oip;
}
void ospf_del_if_params(struct ospf_if_params *oip)
{
list_delete(&oip->auth_crypt);
bfd_info_free(&(oip->bfd_info));
ldp_sync_info_free(&(oip->ldp_sync_info));
XFREE(MTYPE_OSPF_IF_PARAMS, oip);
}
void ospf_free_if_params(struct interface *ifp, struct in_addr addr)
{
struct ospf_if_params *oip;
struct prefix_ipv4 p;
struct route_node *rn;
p.family = AF_INET;
p.prefixlen = IPV4_MAX_PREFIXLEN;
p.prefix = addr;
rn = route_node_lookup(IF_OIFS_PARAMS(ifp), (struct prefix *)&p);
if (!rn || !rn->info)
return;
oip = rn->info;
route_unlock_node(rn);
if (!OSPF_IF_PARAM_CONFIGURED(oip, output_cost_cmd)
&& !OSPF_IF_PARAM_CONFIGURED(oip, transmit_delay)
&& !OSPF_IF_PARAM_CONFIGURED(oip, retransmit_interval)
&& !OSPF_IF_PARAM_CONFIGURED(oip, passive_interface)
&& !OSPF_IF_PARAM_CONFIGURED(oip, v_hello)
&& !OSPF_IF_PARAM_CONFIGURED(oip, fast_hello)
&& !OSPF_IF_PARAM_CONFIGURED(oip, v_wait)
&& !OSPF_IF_PARAM_CONFIGURED(oip, priority)
&& !OSPF_IF_PARAM_CONFIGURED(oip, type)
&& !OSPF_IF_PARAM_CONFIGURED(oip, auth_simple)
&& !OSPF_IF_PARAM_CONFIGURED(oip, auth_type)
&& !OSPF_IF_PARAM_CONFIGURED(oip, if_area)
&& listcount(oip->auth_crypt) == 0) {
ospf_del_if_params(oip);
rn->info = NULL;
route_unlock_node(rn);
}
}
struct ospf_if_params *ospf_lookup_if_params(struct interface *ifp,
struct in_addr addr)
{
struct prefix_ipv4 p;
struct route_node *rn;
p.family = AF_INET;
p.prefixlen = IPV4_MAX_PREFIXLEN;
p.prefix = addr;
rn = route_node_lookup(IF_OIFS_PARAMS(ifp), (struct prefix *)&p);
if (rn) {
route_unlock_node(rn);
return rn->info;
}
return NULL;
}
struct ospf_if_params *ospf_get_if_params(struct interface *ifp,
struct in_addr addr)
{
struct prefix_ipv4 p;
struct route_node *rn;
p.family = AF_INET;
p.prefixlen = IPV4_MAX_PREFIXLEN;
p.prefix = addr;
apply_mask_ipv4(&p);
rn = route_node_get(IF_OIFS_PARAMS(ifp), (struct prefix *)&p);
if (rn->info == NULL)
rn->info = ospf_new_if_params();
else
route_unlock_node(rn);
return rn->info;
}
void ospf_if_update_params(struct interface *ifp, struct in_addr addr)
{
struct route_node *rn;
struct ospf_interface *oi;
for (rn = route_top(IF_OIFS(ifp)); rn; rn = route_next(rn)) {
if ((oi = rn->info) == NULL)
continue;
if (IPV4_ADDR_SAME(&oi->address->u.prefix4, &addr))
oi->params = ospf_lookup_if_params(
ifp, oi->address->u.prefix4);
}
}
int ospf_if_new_hook(struct interface *ifp)
{
int rc = 0;
struct ospf_if_info *oii;
ifp->info = XCALLOC(MTYPE_OSPF_IF_INFO, sizeof(struct ospf_if_info));
oii = ifp->info;
oii->curr_mtu = ifp->mtu;
IF_OIFS(ifp) = route_table_init();
IF_OIFS_PARAMS(ifp) = route_table_init();
IF_DEF_PARAMS(ifp) = ospf_new_if_params();
SET_IF_PARAM(IF_DEF_PARAMS(ifp), transmit_delay);
IF_DEF_PARAMS(ifp)->transmit_delay = OSPF_TRANSMIT_DELAY_DEFAULT;
SET_IF_PARAM(IF_DEF_PARAMS(ifp), retransmit_interval);
IF_DEF_PARAMS(ifp)->retransmit_interval =
OSPF_RETRANSMIT_INTERVAL_DEFAULT;
SET_IF_PARAM(IF_DEF_PARAMS(ifp), priority);
IF_DEF_PARAMS(ifp)->priority = OSPF_ROUTER_PRIORITY_DEFAULT;
IF_DEF_PARAMS(ifp)->mtu_ignore = OSPF_MTU_IGNORE_DEFAULT;
SET_IF_PARAM(IF_DEF_PARAMS(ifp), v_hello);
IF_DEF_PARAMS(ifp)->v_hello = OSPF_HELLO_INTERVAL_DEFAULT;
SET_IF_PARAM(IF_DEF_PARAMS(ifp), fast_hello);
IF_DEF_PARAMS(ifp)->fast_hello = OSPF_FAST_HELLO_DEFAULT;
SET_IF_PARAM(IF_DEF_PARAMS(ifp), v_wait);
IF_DEF_PARAMS(ifp)->v_wait = OSPF_ROUTER_DEAD_INTERVAL_DEFAULT;
SET_IF_PARAM(IF_DEF_PARAMS(ifp), auth_simple);
memset(IF_DEF_PARAMS(ifp)->auth_simple, 0, OSPF_AUTH_SIMPLE_SIZE);
SET_IF_PARAM(IF_DEF_PARAMS(ifp), auth_type);
IF_DEF_PARAMS(ifp)->auth_type = OSPF_AUTH_NOTSET;
rc = ospf_opaque_new_if(ifp);
return rc;
}
static int ospf_if_delete_hook(struct interface *ifp)
{
int rc = 0;
struct route_node *rn;
rc = ospf_opaque_del_if(ifp);
route_table_finish(IF_OIFS(ifp));
for (rn = route_top(IF_OIFS_PARAMS(ifp)); rn; rn = route_next(rn))
if (rn->info)
ospf_del_if_params(rn->info);
route_table_finish(IF_OIFS_PARAMS(ifp));
ospf_del_if_params((struct ospf_if_params *)IF_DEF_PARAMS(ifp));
XFREE(MTYPE_OSPF_IF_INFO, ifp->info);
return rc;
}
int ospf_if_is_enable(struct ospf_interface *oi)
{
if (!(if_is_loopback(oi->ifp) || if_is_vrf(oi->ifp)))
if (if_is_up(oi->ifp))
return 1;
return 0;
}
void ospf_if_set_multicast(struct ospf_interface *oi)
{
if ((oi->state > ISM_Loopback) && (oi->type != OSPF_IFTYPE_LOOPBACK)
&& (oi->type != OSPF_IFTYPE_VIRTUALLINK)
&& (OSPF_IF_PASSIVE_STATUS(oi) == OSPF_IF_ACTIVE)) {
/* The interface should belong to the OSPF-all-routers group. */
if (!OI_MEMBER_CHECK(oi, MEMBER_ALLROUTERS)
&& (ospf_if_add_allspfrouters(oi->ospf, oi->address,
oi->ifp->ifindex)
>= 0))
/* Set the flag only if the system call to join
* succeeded. */
OI_MEMBER_JOINED(oi, MEMBER_ALLROUTERS);
} else {
/* The interface should NOT belong to the OSPF-all-routers
* group. */
if (OI_MEMBER_CHECK(oi, MEMBER_ALLROUTERS)) {
/* Only actually drop if this is the last reference */
if (OI_MEMBER_COUNT(oi, MEMBER_ALLROUTERS) == 1)
ospf_if_drop_allspfrouters(oi->ospf,
oi->address,
oi->ifp->ifindex);
/* Unset the flag regardless of whether the system call
to leave
the group succeeded, since it's much safer to assume
that
we are not a member. */
OI_MEMBER_LEFT(oi, MEMBER_ALLROUTERS);
}
}
if (((oi->type == OSPF_IFTYPE_BROADCAST)
|| (oi->type == OSPF_IFTYPE_POINTOPOINT))
&& ((oi->state == ISM_DR) || (oi->state == ISM_Backup))
&& (OSPF_IF_PASSIVE_STATUS(oi) == OSPF_IF_ACTIVE)) {
/* The interface should belong to the OSPF-designated-routers
* group. */
if (!OI_MEMBER_CHECK(oi, MEMBER_DROUTERS)
&& (ospf_if_add_alldrouters(oi->ospf, oi->address,
oi->ifp->ifindex)
>= 0))
/* Set the flag only if the system call to join
* succeeded. */
OI_MEMBER_JOINED(oi, MEMBER_DROUTERS);
} else {
/* The interface should NOT belong to the
* OSPF-designated-routers group */
if (OI_MEMBER_CHECK(oi, MEMBER_DROUTERS)) {
/* drop only if last reference */
if (OI_MEMBER_COUNT(oi, MEMBER_DROUTERS) == 1)
ospf_if_drop_alldrouters(oi->ospf, oi->address,
oi->ifp->ifindex);
/* Unset the flag regardless of whether the system call
to leave
the group succeeded, since it's much safer to assume
that
we are not a member. */
OI_MEMBER_LEFT(oi, MEMBER_DROUTERS);
}
}
}
int ospf_if_up(struct ospf_interface *oi)
{
if (oi == NULL)
return 0;
if (oi->type == OSPF_IFTYPE_LOOPBACK)
OSPF_ISM_EVENT_SCHEDULE(oi, ISM_LoopInd);
else {
OSPF_ISM_EVENT_SCHEDULE(oi, ISM_InterfaceUp);
}
return 1;
}
int ospf_if_down(struct ospf_interface *oi)
{
struct ospf *ospf;
if (oi == NULL)
return 0;
ospf = oi->ospf;
/* Cease the HELPER role for all the neighbours
* of this interface.
*/
if (ospf->is_helper_supported) {
struct route_node *rn = NULL;
if (ospf_interface_neighbor_count(oi)) {
for (rn = route_top(oi->nbrs); rn;
rn = route_next(rn)) {
struct ospf_neighbor *nbr = NULL;
if (!rn->info)
continue;
nbr = rn->info;
if (OSPF_GR_IS_ACTIVE_HELPER(nbr))
ospf_gr_helper_exit(
nbr, OSPF_GR_HELPER_TOPO_CHG);
}
}
}
OSPF_ISM_EVENT_EXECUTE(oi, ISM_InterfaceDown);
/* delete position in router LSA */
oi->lsa_pos_beg = 0;
oi->lsa_pos_end = 0;
/* Shutdown packet reception and sending */
ospf_if_stream_unset(oi);
return 1;
}
/* Virtual Link related functions. */
struct ospf_vl_data *ospf_vl_data_new(struct ospf_area *area,
struct in_addr vl_peer)
{
struct ospf_vl_data *vl_data;
vl_data = XCALLOC(MTYPE_OSPF_VL_DATA, sizeof(struct ospf_vl_data));
vl_data->vl_peer.s_addr = vl_peer.s_addr;
vl_data->vl_area_id = area->area_id;
vl_data->vl_area_id_fmt = area->area_id_fmt;
return vl_data;
}
void ospf_vl_data_free(struct ospf_vl_data *vl_data)
{
XFREE(MTYPE_OSPF_VL_DATA, vl_data);
}
unsigned int vlink_count = 0;
struct ospf_interface *ospf_vl_new(struct ospf *ospf,
struct ospf_vl_data *vl_data)
{
struct ospf_interface *voi;
struct interface *vi;
char ifname[INTERFACE_NAMSIZ];
struct ospf_area *area;
struct in_addr area_id;
struct connected *co;
struct prefix_ipv4 *p;
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("ospf_vl_new()(%s): Start", ospf_get_name(ospf));
if (vlink_count == OSPF_VL_MAX_COUNT) {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_vl_new(): Alarm: cannot create more than OSPF_MAX_VL_COUNT virtual links");
return NULL;
}
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_vl_new(): creating pseudo zebra interface vrf id %u",
ospf->vrf_id);
snprintf(ifname, sizeof(ifname), "VLINK%u", vlink_count);
vi = if_create_name(ifname, ospf->vrf_id);
/*
* if_create_name sets ZEBRA_INTERFACE_LINKDETECTION
* virtual links don't need this.
*/
UNSET_FLAG(vi->status, ZEBRA_INTERFACE_LINKDETECTION);
co = connected_new();
co->ifp = vi;
listnode_add(vi->connected, co);
p = prefix_ipv4_new();
p->family = AF_INET;
p->prefix.s_addr = INADDR_ANY;
p->prefixlen = 0;
co->address = (struct prefix *)p;
voi = ospf_if_new(ospf, vi, co->address);
if (voi == NULL) {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_vl_new(): Alarm: OSPF int structure is not created");
return NULL;
}
voi->connected = co;
voi->vl_data = vl_data;
voi->ifp->mtu = OSPF_VL_MTU;
voi->type = OSPF_IFTYPE_VIRTUALLINK;
vlink_count++;
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("ospf_vl_new(): Created name: %s", ifname);
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("ospf_vl_new(): set if->name to %s", vi->name);
area_id.s_addr = INADDR_ANY;
area = ospf_area_get(ospf, area_id);
voi->area = area;
if (IS_DEBUG_OSPF_EVENT)
zlog_debug(
"ospf_vl_new(): set associated area to the backbone");
/* Add pseudo neighbor. */
ospf_nbr_self_reset(voi, voi->ospf->router_id);
ospf_area_add_if(voi->area, voi);
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("ospf_vl_new(): Stop");
return voi;
}
static void ospf_vl_if_delete(struct ospf_vl_data *vl_data)
{
struct interface *ifp = vl_data->vl_oi->ifp;
vl_data->vl_oi->address->u.prefix4.s_addr = INADDR_ANY;
vl_data->vl_oi->address->prefixlen = 0;
ospf_if_free(vl_data->vl_oi);
if_delete(&ifp);
vlink_count--;
}
/* for a defined area, count the number of configured vl
*/
int ospf_vl_count(struct ospf *ospf, struct ospf_area *area)
{
int count = 0;
struct ospf_vl_data *vl_data;
struct listnode *node;
for (ALL_LIST_ELEMENTS_RO(ospf->vlinks, node, vl_data)) {
if (area
&& !IPV4_ADDR_SAME(&vl_data->vl_area_id, &area->area_id))
continue;
count++;
}
return count;
}
/* Look up vl_data for given peer, optionally qualified to be in the
* specified area. NULL area returns first found..
*/
struct ospf_vl_data *ospf_vl_lookup(struct ospf *ospf, struct ospf_area *area,
struct in_addr vl_peer)
{
struct ospf_vl_data *vl_data;
struct listnode *node;
if (IS_DEBUG_OSPF_EVENT) {
zlog_debug("%s: Looking for %s", __func__, inet_ntoa(vl_peer));
if (area)
zlog_debug("%s: in area %s", __func__,
inet_ntoa(area->area_id));
}
for (ALL_LIST_ELEMENTS_RO(ospf->vlinks, node, vl_data)) {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("%s: VL %s, peer %s", __func__,
vl_data->vl_oi->ifp->name,
inet_ntoa(vl_data->vl_peer));
if (area
&& !IPV4_ADDR_SAME(&vl_data->vl_area_id, &area->area_id))
continue;
if (IPV4_ADDR_SAME(&vl_data->vl_peer, &vl_peer))
return vl_data;
}