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ospf_lsa.c
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/*
* OSPF Link State Advertisement
* 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 "monotime.h"
#include "linklist.h"
#include "prefix.h"
#include "if.h"
#include "table.h"
#include "memory.h"
#include "stream.h"
#include "log.h"
#include "thread.h"
#include "hash.h"
#include "sockunion.h" /* for inet_aton() */
#include "checksum.h"
#include "ospfd/ospfd.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_flood.h"
#include "ospfd/ospf_packet.h"
#include "ospfd/ospf_spf.h"
#include "ospfd/ospf_dump.h"
#include "ospfd/ospf_route.h"
#include "ospfd/ospf_ase.h"
#include "ospfd/ospf_zebra.h"
#include "ospfd/ospf_abr.h"
#include "ospfd/ospf_errors.h"
uint32_t get_metric(uint8_t *metric)
{
uint32_t m;
m = metric[0];
m = (m << 8) + metric[1];
m = (m << 8) + metric[2];
return m;
}
struct timeval int2tv(int a)
{
struct timeval ret;
ret.tv_sec = a;
ret.tv_usec = 0;
return ret;
}
struct timeval msec2tv(int a)
{
struct timeval ret;
ret.tv_sec = a / 1000;
ret.tv_usec = (a % 1000) * 1000;
return ret;
}
int ospf_lsa_refresh_delay(struct ospf_lsa *lsa)
{
struct timeval delta;
int delay = 0;
if (monotime_since(&lsa->tv_orig, &delta)
< OSPF_MIN_LS_INTERVAL * 1000LL) {
struct timeval minv = msec2tv(OSPF_MIN_LS_INTERVAL);
timersub(&minv, &delta, &minv);
/* TBD: remove padding to full sec, return timeval instead */
delay = minv.tv_sec + !!minv.tv_usec;
if (IS_DEBUG_OSPF(lsa, LSA_GENERATE))
zlog_debug(
"LSA[Type%d:%s]: Refresh timer delay %d seconds",
lsa->data->type, inet_ntoa(lsa->data->id),
delay);
assert(delay > 0);
}
return delay;
}
int get_age(struct ospf_lsa *lsa)
{
struct timeval rel;
monotime_since(&lsa->tv_recv, &rel);
return ntohs(lsa->data->ls_age) + rel.tv_sec;
}
/* Fletcher Checksum -- Refer to RFC1008. */
/* All the offsets are zero-based. The offsets in the RFC1008 are
one-based. */
uint16_t ospf_lsa_checksum(struct lsa_header *lsa)
{
uint8_t *buffer = (uint8_t *)&lsa->options;
int options_offset = buffer - (uint8_t *)&lsa->ls_age; /* should be 2 */
/* Skip the AGE field */
uint16_t len = ntohs(lsa->length) - options_offset;
/* Checksum offset starts from "options" field, not the beginning of the
lsa_header struct. The offset is 14, rather than 16. */
int checksum_offset = (uint8_t *)&lsa->checksum - buffer;
return fletcher_checksum(buffer, len, checksum_offset);
}
int ospf_lsa_checksum_valid(struct lsa_header *lsa)
{
uint8_t *buffer = (uint8_t *)&lsa->options;
int options_offset = buffer - (uint8_t *)&lsa->ls_age; /* should be 2 */
/* Skip the AGE field */
uint16_t len = ntohs(lsa->length) - options_offset;
return (fletcher_checksum(buffer, len, FLETCHER_CHECKSUM_VALIDATE)
== 0);
}
/* Create OSPF LSA. */
struct ospf_lsa *ospf_lsa_new(void)
{
struct ospf_lsa *new;
new = XCALLOC(MTYPE_OSPF_LSA, sizeof(struct ospf_lsa));
new->flags = 0;
new->lock = 1;
new->retransmit_counter = 0;
monotime(&new->tv_recv);
new->tv_orig = new->tv_recv;
new->refresh_list = -1;
new->vrf_id = VRF_DEFAULT;
return new;
}
struct ospf_lsa *ospf_lsa_new_and_data(size_t size)
{
struct ospf_lsa *new;
new = ospf_lsa_new();
new->data = ospf_lsa_data_new(size);
return new;
}
/* Duplicate OSPF LSA. */
struct ospf_lsa *ospf_lsa_dup(struct ospf_lsa *lsa)
{
struct ospf_lsa *new;
if (lsa == NULL)
return NULL;
new = XCALLOC(MTYPE_OSPF_LSA, sizeof(struct ospf_lsa));
memcpy(new, lsa, sizeof(struct ospf_lsa));
UNSET_FLAG(new->flags, OSPF_LSA_DISCARD);
new->lock = 1;
new->retransmit_counter = 0;
new->data = ospf_lsa_data_dup(lsa->data);
/* kevinm: Clear the refresh_list, otherwise there are going
to be problems when we try to remove the LSA from the
queue (which it's not a member of.)
XXX: Should we add the LSA to the refresh_list queue? */
new->refresh_list = -1;
if (IS_DEBUG_OSPF(lsa, LSA))
zlog_debug("LSA: duplicated %p (new: %p)", (void *)lsa,
(void *)new);
return new;
}
/* Free OSPF LSA. */
void ospf_lsa_free(struct ospf_lsa *lsa)
{
assert(lsa->lock == 0);
if (IS_DEBUG_OSPF(lsa, LSA))
zlog_debug("LSA: freed %p", (void *)lsa);
/* Delete LSA data. */
if (lsa->data != NULL)
ospf_lsa_data_free(lsa->data);
assert(lsa->refresh_list < 0);
memset(lsa, 0, sizeof(struct ospf_lsa));
XFREE(MTYPE_OSPF_LSA, lsa);
}
/* Lock LSA. */
struct ospf_lsa *ospf_lsa_lock(struct ospf_lsa *lsa)
{
lsa->lock++;
return lsa;
}
/* Unlock LSA. */
void ospf_lsa_unlock(struct ospf_lsa **lsa)
{
/* This is sanity check. */
if (!lsa || !*lsa)
return;
(*lsa)->lock--;
assert((*lsa)->lock >= 0);
if ((*lsa)->lock == 0) {
assert(CHECK_FLAG((*lsa)->flags, OSPF_LSA_DISCARD));
ospf_lsa_free(*lsa);
*lsa = NULL;
}
}
/* Check discard flag. */
void ospf_lsa_discard(struct ospf_lsa *lsa)
{
if (!CHECK_FLAG(lsa->flags, OSPF_LSA_DISCARD)) {
SET_FLAG(lsa->flags, OSPF_LSA_DISCARD);
ospf_lsa_unlock(&lsa);
}
}
/* Create LSA data. */
struct lsa_header *ospf_lsa_data_new(size_t size)
{
return XCALLOC(MTYPE_OSPF_LSA_DATA, size);
}
/* Duplicate LSA data. */
struct lsa_header *ospf_lsa_data_dup(struct lsa_header *lsah)
{
struct lsa_header *new;
new = ospf_lsa_data_new(ntohs(lsah->length));
memcpy(new, lsah, ntohs(lsah->length));
return new;
}
/* Free LSA data. */
void ospf_lsa_data_free(struct lsa_header *lsah)
{
if (IS_DEBUG_OSPF(lsa, LSA))
zlog_debug("LSA[Type%d:%s]: data freed %p", lsah->type,
inet_ntoa(lsah->id), (void *)lsah);
XFREE(MTYPE_OSPF_LSA_DATA, lsah);
}
/* LSA general functions. */
const char *dump_lsa_key(struct ospf_lsa *lsa)
{
static char buf[] = {"Type255,id(255.255.255.255),ar(255.255.255.255)"};
struct lsa_header *lsah;
if (lsa != NULL && (lsah = lsa->data) != NULL) {
char id[INET_ADDRSTRLEN], ar[INET_ADDRSTRLEN];
strlcpy(id, inet_ntoa(lsah->id), sizeof(id));
strlcpy(ar, inet_ntoa(lsah->adv_router), sizeof(ar));
sprintf(buf, "Type%d,id(%s),ar(%s)", lsah->type, id, ar);
} else
strlcpy(buf, "NULL", sizeof(buf));
return buf;
}
uint32_t lsa_seqnum_increment(struct ospf_lsa *lsa)
{
uint32_t seqnum;
seqnum = ntohl(lsa->data->ls_seqnum) + 1;
return htonl(seqnum);
}
void lsa_header_set(struct stream *s, uint8_t options, uint8_t type,
struct in_addr id, struct in_addr router_id)
{
struct lsa_header *lsah;
lsah = (struct lsa_header *)STREAM_DATA(s);
lsah->ls_age = htons(OSPF_LSA_INITIAL_AGE);
lsah->options = options;
lsah->type = type;
lsah->id = id;
lsah->adv_router = router_id;
lsah->ls_seqnum = htonl(OSPF_INITIAL_SEQUENCE_NUMBER);
stream_forward_endp(s, OSPF_LSA_HEADER_SIZE);
}
/* router-LSA related functions. */
/* Get router-LSA flags. */
static uint8_t router_lsa_flags(struct ospf_area *area)
{
uint8_t flags;
flags = area->ospf->flags;
/* Set virtual link flag. */
if (ospf_full_virtual_nbrs(area))
SET_FLAG(flags, ROUTER_LSA_VIRTUAL);
else
/* Just sanity check */
UNSET_FLAG(flags, ROUTER_LSA_VIRTUAL);
/* Set Shortcut ABR behabiour flag. */
UNSET_FLAG(flags, ROUTER_LSA_SHORTCUT);
if (area->ospf->abr_type == OSPF_ABR_SHORTCUT)
if (!OSPF_IS_AREA_BACKBONE(area))
if ((area->shortcut_configured == OSPF_SHORTCUT_DEFAULT
&& area->ospf->backbone == NULL)
|| area->shortcut_configured
== OSPF_SHORTCUT_ENABLE)
SET_FLAG(flags, ROUTER_LSA_SHORTCUT);
/* ASBR can't exit in stub area. */
if (area->external_routing == OSPF_AREA_STUB)
UNSET_FLAG(flags, ROUTER_LSA_EXTERNAL);
/* If ASBR set External flag */
else if (IS_OSPF_ASBR(area->ospf))
SET_FLAG(flags, ROUTER_LSA_EXTERNAL);
/* Set ABR dependent flags */
if (IS_OSPF_ABR(area->ospf)) {
SET_FLAG(flags, ROUTER_LSA_BORDER);
/* If Area is NSSA and we are both ABR and unconditional
* translator,
* set Nt bit to inform other routers.
*/
if ((area->external_routing == OSPF_AREA_NSSA)
&& (area->NSSATranslatorRole == OSPF_NSSA_ROLE_ALWAYS))
SET_FLAG(flags, ROUTER_LSA_NT);
}
return flags;
}
/* Lookup neighbor other than myself.
And check neighbor count,
Point-to-Point link must have only 1 neighbor. */
struct ospf_neighbor *ospf_nbr_lookup_ptop(struct ospf_interface *oi)
{
struct ospf_neighbor *nbr = NULL;
struct route_node *rn;
/* Search neighbor, there must be one of two nbrs. */
for (rn = route_top(oi->nbrs); rn; rn = route_next(rn))
if ((nbr = rn->info))
if (!IPV4_ADDR_SAME(&nbr->router_id,
&oi->ospf->router_id))
if (nbr->state == NSM_Full) {
route_unlock_node(rn);
break;
}
/* PtoP link must have only 1 neighbor. */
if (ospf_nbr_count(oi, 0) > 1)
flog_warn(EC_OSPF_PTP_NEIGHBOR,
"Point-to-Point link has more than 1 neighobrs.");
return nbr;
}
/* Determine cost of link, taking RFC3137 stub-router support into
* consideration
*/
static uint16_t ospf_link_cost(struct ospf_interface *oi)
{
/* RFC3137 stub router support */
if (!CHECK_FLAG(oi->area->stub_router_state, OSPF_AREA_IS_STUB_ROUTED))
return oi->output_cost;
else
return OSPF_OUTPUT_COST_INFINITE;
}
/* Set a link information. */
static char link_info_set(struct stream **s, struct in_addr id,
struct in_addr data, uint8_t type, uint8_t tos,
uint16_t cost)
{
/* LSA stream is initially allocated to OSPF_MAX_LSA_SIZE, suits
* vast majority of cases. Some rare routers with lots of links need
* more.
* we try accomodate those here.
*/
if (STREAM_WRITEABLE(*s) < OSPF_ROUTER_LSA_LINK_SIZE) {
size_t ret = OSPF_MAX_LSA_SIZE;
/* Can we enlarge the stream still? */
if (STREAM_SIZE(*s) == OSPF_MAX_LSA_SIZE) {
/* we futz the size here for simplicity, really we need
* to account
* for just:
* IP Header - (sizeof (struct ip))
* OSPF Header - OSPF_HEADER_SIZE
* LSA Header - OSPF_LSA_HEADER_SIZE
* MD5 auth data, if MD5 is configured -
* OSPF_AUTH_MD5_SIZE.
*
* Simpler just to subtract OSPF_MAX_LSA_SIZE though.
*/
ret = stream_resize_inplace(
s, OSPF_MAX_PACKET_SIZE - OSPF_MAX_LSA_SIZE);
}
if (ret == OSPF_MAX_LSA_SIZE) {
flog_warn(
EC_OSPF_LSA_SIZE,
"%s: Out of space in LSA stream, left %zd, size %zd",
__func__, STREAM_WRITEABLE(*s),
STREAM_SIZE(*s));
return 0;
}
}
/* TOS based routing is not supported. */
stream_put_ipv4(*s, id.s_addr); /* Link ID. */
stream_put_ipv4(*s, data.s_addr); /* Link Data. */
stream_putc(*s, type); /* Link Type. */
stream_putc(*s, tos); /* TOS = 0. */
stream_putw(*s, cost); /* Link Cost. */
return 1;
}
/* Describe Point-to-Point link (Section 12.4.1.1). */
static int lsa_link_ptop_set(struct stream **s, struct ospf_interface *oi)
{
int links = 0;
struct ospf_neighbor *nbr;
struct in_addr id, mask, data;
uint16_t cost = ospf_link_cost(oi);
if (IS_DEBUG_OSPF(lsa, LSA_GENERATE))
zlog_debug("LSA[Type1]: Set link Point-to-Point");
if ((nbr = ospf_nbr_lookup_ptop(oi)))
if (nbr->state == NSM_Full) {
if (CHECK_FLAG(oi->connected->flags,
ZEBRA_IFA_UNNUMBERED)) {
/* For unnumbered point-to-point networks, the
Link Data field
should specify the interface's MIB-II ifIndex
value. */
data.s_addr = htonl(oi->ifp->ifindex);
links += link_info_set(
s, nbr->router_id, data,
LSA_LINK_TYPE_POINTOPOINT, 0, cost);
} else {
links += link_info_set(
s, nbr->router_id,
oi->address->u.prefix4,
LSA_LINK_TYPE_POINTOPOINT, 0, cost);
}
}
/* no need for a stub link for unnumbered interfaces */
if (!CHECK_FLAG(oi->connected->flags, ZEBRA_IFA_UNNUMBERED)) {
/* Regardless of the state of the neighboring router, we must
add a Type 3 link (stub network).
N.B. Options 1 & 2 share basically the same logic. */
masklen2ip(oi->address->prefixlen, &mask);
id.s_addr = CONNECTED_PREFIX(oi->connected)->u.prefix4.s_addr
& mask.s_addr;
links += link_info_set(s, id, mask, LSA_LINK_TYPE_STUB, 0,
oi->output_cost);
}
return links;
}
/* Describe Broadcast Link. */
static int lsa_link_broadcast_set(struct stream **s, struct ospf_interface *oi)
{
struct ospf_neighbor *dr;
struct in_addr id, mask;
uint16_t cost = ospf_link_cost(oi);
/* Describe Type 3 Link. */
if (oi->state == ISM_Waiting) {
if (IS_DEBUG_OSPF(lsa, LSA_GENERATE))
zlog_debug(
"LSA[Type1]: Interface %s is in state Waiting. "
"Adding stub interface",
oi->ifp->name);
masklen2ip(oi->address->prefixlen, &mask);
id.s_addr = oi->address->u.prefix4.s_addr & mask.s_addr;
return link_info_set(s, id, mask, LSA_LINK_TYPE_STUB, 0,
oi->output_cost);
}
dr = ospf_nbr_lookup_by_addr(oi->nbrs, &DR(oi));
/* Describe Type 2 link. */
if (dr && (dr->state == NSM_Full
|| IPV4_ADDR_SAME(&oi->address->u.prefix4, &DR(oi)))
&& ospf_nbr_count(oi, NSM_Full) > 0) {
if (IS_DEBUG_OSPF(lsa, LSA_GENERATE))
zlog_debug(
"LSA[Type1]: Interface %s has a DR. "
"Adding transit interface",
oi->ifp->name);
return link_info_set(s, DR(oi), oi->address->u.prefix4,
LSA_LINK_TYPE_TRANSIT, 0, cost);
}
/* Describe type 3 link. */
else {
if (IS_DEBUG_OSPF(lsa, LSA_GENERATE))
zlog_debug(
"LSA[Type1]: Interface %s has no DR. "
"Adding stub interface",
oi->ifp->name);
masklen2ip(oi->address->prefixlen, &mask);
id.s_addr = oi->address->u.prefix4.s_addr & mask.s_addr;
return link_info_set(s, id, mask, LSA_LINK_TYPE_STUB, 0,
oi->output_cost);
}
}
static int lsa_link_loopback_set(struct stream **s, struct ospf_interface *oi)
{
struct in_addr id, mask;
/* Describe Type 3 Link. */
if (oi->state != ISM_Loopback)
return 0;
mask.s_addr = 0xffffffff;
id.s_addr = oi->address->u.prefix4.s_addr;
return link_info_set(s, id, mask, LSA_LINK_TYPE_STUB, 0, 0);
}
/* Describe Virtual Link. */
static int lsa_link_virtuallink_set(struct stream **s,
struct ospf_interface *oi)
{
struct ospf_neighbor *nbr;
uint16_t cost = ospf_link_cost(oi);
if (oi->state == ISM_PointToPoint)
if ((nbr = ospf_nbr_lookup_ptop(oi)))
if (nbr->state == NSM_Full) {
return link_info_set(s, nbr->router_id,
oi->address->u.prefix4,
LSA_LINK_TYPE_VIRTUALLINK,
0, cost);
}
return 0;
}
#define lsa_link_nbma_set(S,O) lsa_link_broadcast_set (S, O)
/* this function add for support point-to-multipoint ,see rfc2328
12.4.1.4.*/
/* from "edward rrr" <edward_rrr@hotmail.com>
http://marc.theaimsgroup.com/?l=zebra&m=100739222210507&w=2 */
static int lsa_link_ptomp_set(struct stream **s, struct ospf_interface *oi)
{
int links = 0;
struct route_node *rn;
struct ospf_neighbor *nbr = NULL;
struct in_addr id, mask;
uint16_t cost = ospf_link_cost(oi);
mask.s_addr = 0xffffffff;
id.s_addr = oi->address->u.prefix4.s_addr;
links += link_info_set(s, id, mask, LSA_LINK_TYPE_STUB, 0, 0);
if (IS_DEBUG_OSPF(lsa, LSA_GENERATE))
zlog_debug("PointToMultipoint: running ptomultip_set");
/* Search neighbor, */
for (rn = route_top(oi->nbrs); rn; rn = route_next(rn))
if ((nbr = rn->info) != NULL)
/* Ignore myself. */
if (!IPV4_ADDR_SAME(&nbr->router_id,
&oi->ospf->router_id))
if (nbr->state == NSM_Full)
{
links += link_info_set(
s, nbr->router_id,
oi->address->u.prefix4,
LSA_LINK_TYPE_POINTOPOINT, 0,
cost);
if (IS_DEBUG_OSPF(lsa, LSA_GENERATE))
zlog_debug(
"PointToMultipoint: set link to %s",
inet_ntoa(
oi->address->u
.prefix4));
}
return links;
}
/* Set router-LSA link information. */
static int router_lsa_link_set(struct stream **s, struct ospf_area *area)
{
struct listnode *node;
struct ospf_interface *oi;
int links = 0;
for (ALL_LIST_ELEMENTS_RO(area->oiflist, node, oi)) {
struct interface *ifp = oi->ifp;
/* Check interface is up, OSPF is enable. */
if (if_is_operative(ifp)) {
if (oi->state != ISM_Down) {
oi->lsa_pos_beg = links;
/* Describe each link. */
switch (oi->type) {
case OSPF_IFTYPE_POINTOPOINT:
links += lsa_link_ptop_set(s, oi);
break;
case OSPF_IFTYPE_BROADCAST:
links += lsa_link_broadcast_set(s, oi);
break;
case OSPF_IFTYPE_NBMA:
links += lsa_link_nbma_set(s, oi);
break;
case OSPF_IFTYPE_POINTOMULTIPOINT:
links += lsa_link_ptomp_set(s, oi);
break;
case OSPF_IFTYPE_VIRTUALLINK:
links +=
lsa_link_virtuallink_set(s, oi);
break;
case OSPF_IFTYPE_LOOPBACK:
links += lsa_link_loopback_set(s, oi);
}
oi->lsa_pos_end = links;
}
}
}
return links;
}
/* Set router-LSA body. */
static void ospf_router_lsa_body_set(struct stream **s, struct ospf_area *area)
{
unsigned long putp;
uint16_t cnt;
/* Set flags. */
stream_putc(*s, router_lsa_flags(area));
/* Set Zero fields. */
stream_putc(*s, 0);
/* Keep pointer to # links. */
putp = stream_get_endp(*s);
/* Forward word */
stream_putw(*s, 0);
/* Set all link information. */
cnt = router_lsa_link_set(s, area);
/* Set # of links here. */
stream_putw_at(*s, putp, cnt);
}
static int ospf_stub_router_timer(struct thread *t)
{
struct ospf_area *area = THREAD_ARG(t);
area->t_stub_router = NULL;
SET_FLAG(area->stub_router_state, OSPF_AREA_WAS_START_STUB_ROUTED);
/* clear stub route state and generate router-lsa refresh, don't
* clobber an administratively set stub-router state though.
*/
if (CHECK_FLAG(area->stub_router_state, OSPF_AREA_ADMIN_STUB_ROUTED))
return 0;
UNSET_FLAG(area->stub_router_state, OSPF_AREA_IS_STUB_ROUTED);
ospf_router_lsa_update_area(area);
return 0;
}
static void ospf_stub_router_check(struct ospf_area *area)
{
/* area must either be administratively configured to be stub
* or startup-time stub-router must be configured and we must in a
* pre-stub
* state.
*/
if (CHECK_FLAG(area->stub_router_state, OSPF_AREA_ADMIN_STUB_ROUTED)) {
SET_FLAG(area->stub_router_state, OSPF_AREA_IS_STUB_ROUTED);
return;
}
/* not admin-stubbed, check whether startup stubbing is configured and
* whether it's not been done yet
*/
if (CHECK_FLAG(area->stub_router_state,
OSPF_AREA_WAS_START_STUB_ROUTED))
return;
if (area->ospf->stub_router_startup_time
== OSPF_STUB_ROUTER_UNCONFIGURED) {
/* stub-router is hence done forever for this area, even if
* someone
* tries configure it (take effect next restart).
*/
SET_FLAG(area->stub_router_state,
OSPF_AREA_WAS_START_STUB_ROUTED);
return;
}
/* startup stub-router configured and not yet done */
SET_FLAG(area->stub_router_state, OSPF_AREA_IS_STUB_ROUTED);
OSPF_AREA_TIMER_ON(area->t_stub_router, ospf_stub_router_timer,
area->ospf->stub_router_startup_time);
}
/* Create new router-LSA. */
static struct ospf_lsa *ospf_router_lsa_new(struct ospf_area *area)
{
struct ospf *ospf = area->ospf;
struct stream *s;
struct lsa_header *lsah;
struct ospf_lsa *new;
int length;
if (IS_DEBUG_OSPF(lsa, LSA_GENERATE))
zlog_debug("LSA[Type1]: Create router-LSA instance");
/* check whether stub-router is desired, and if this is the first
* router LSA.
*/
ospf_stub_router_check(area);
/* Create a stream for LSA. */
s = stream_new(OSPF_MAX_LSA_SIZE);
/* Set LSA common header fields. */
lsa_header_set(s, LSA_OPTIONS_GET(area) | LSA_OPTIONS_NSSA_GET(area),
OSPF_ROUTER_LSA, ospf->router_id, ospf->router_id);
/* Set router-LSA body fields. */
ospf_router_lsa_body_set(&s, area);
/* Set length. */
length = stream_get_endp(s);
lsah = (struct lsa_header *)STREAM_DATA(s);
lsah->length = htons(length);
/* Now, create OSPF LSA instance. */
new = ospf_lsa_new_and_data(length);
new->area = area;
SET_FLAG(new->flags, OSPF_LSA_SELF | OSPF_LSA_SELF_CHECKED);
new->vrf_id = area->ospf->vrf_id;
/* Copy LSA data to store, discard stream. */
memcpy(new->data, lsah, length);
stream_free(s);
return new;
}
/* Originate Router-LSA. */
static struct ospf_lsa *ospf_router_lsa_originate(struct ospf_area *area)
{
struct ospf_lsa *new;
/* Create new router-LSA instance. */
if ((new = ospf_router_lsa_new(area)) == NULL) {
zlog_err("%s: ospf_router_lsa_new returned NULL", __func__);
return NULL;
}
/* Sanity check. */
if (new->data->adv_router.s_addr == 0) {
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("LSA[Type1]: AdvRouter is 0, discard");
ospf_lsa_discard(new);
return NULL;
}
/* Install LSA to LSDB. */
new = ospf_lsa_install(area->ospf, NULL, new);
/* Update LSA origination count. */
area->ospf->lsa_originate_count++;
/* Flooding new LSA through area. */
ospf_flood_through_area(area, NULL, new);
if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) {
zlog_debug("LSA[Type%d:%s]: Originate router-LSA %p",
new->data->type, inet_ntoa(new->data->id),
(void *)new);
ospf_lsa_header_dump(new->data);
}
return new;
}
/* Refresh router-LSA. */
static struct ospf_lsa *ospf_router_lsa_refresh(struct ospf_lsa *lsa)
{
struct ospf_area *area = lsa->area;
struct ospf_lsa *new;
/* Sanity check. */
assert(lsa->data);
/* Delete LSA from neighbor retransmit-list. */
ospf_ls_retransmit_delete_nbr_area(area, lsa);
/* Unregister LSA from refresh-list */
ospf_refresher_unregister_lsa(area->ospf, lsa);
/* Create new router-LSA instance. */
if ((new = ospf_router_lsa_new(area)) == NULL) {
zlog_err("%s: ospf_router_lsa_new returned NULL", __func__);
return NULL;
}
new->data->ls_seqnum = lsa_seqnum_increment(lsa);
ospf_lsa_install(area->ospf, NULL, new);
/* Flood LSA through area. */
ospf_flood_through_area(area, NULL, new);
/* Debug logging. */
if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) {
zlog_debug("LSA[Type%d:%s]: router-LSA refresh",
new->data->type, inet_ntoa(new->data->id));
ospf_lsa_header_dump(new->data);
}
return NULL;
}
int ospf_router_lsa_update_area(struct ospf_area *area)
{
if (IS_DEBUG_OSPF_EVENT)
zlog_debug("[router-LSA]: (router-LSA area update)");
/* Now refresh router-LSA. */
if (area->router_lsa_self)
ospf_lsa_refresh(area->ospf, area->router_lsa_self);
/* Newly originate router-LSA. */
else
ospf_router_lsa_originate(area);
return 0;
}
int ospf_router_lsa_update(struct ospf *ospf)
{
struct listnode *node, *nnode;
struct ospf_area *area;
if (IS_DEBUG_OSPF(lsa, LSA_GENERATE))
zlog_debug("Timer[router-LSA Update]: (timer expire)");
for (ALL_LIST_ELEMENTS(ospf->areas, node, nnode, area)) {
struct ospf_lsa *lsa = area->router_lsa_self;
struct router_lsa *rl;
const char *area_str;
/* Keep Area ID string. */
area_str = AREA_NAME(area);
/* If LSA not exist in this Area, originate new. */
if (lsa == NULL) {
if (IS_DEBUG_OSPF(lsa, LSA_GENERATE))
zlog_debug(
"LSA[Type1]: Create router-LSA for Area %s",
area_str);
ospf_router_lsa_originate(area);
}
/* If router-ID is changed, Link ID must change.
First flush old LSA, then originate new. */
else if (!IPV4_ADDR_SAME(&lsa->data->id, &ospf->router_id)) {
if (IS_DEBUG_OSPF(lsa, LSA_GENERATE))
zlog_debug(
"LSA[Type%d:%s]: Refresh router-LSA for Area %s",
lsa->data->type,
inet_ntoa(lsa->data->id), area_str);
ospf_refresher_unregister_lsa(ospf, lsa);
ospf_lsa_flush_area(lsa, area);
ospf_lsa_unlock(&area->router_lsa_self);
area->router_lsa_self = NULL;
/* Refresh router-LSA, (not install) and flood through
* area. */
ospf_router_lsa_update_area(area);
} else {
rl = (struct router_lsa *)lsa->data;
/* Refresh router-LSA, (not install) and flood through
* area. */
if (rl->flags != ospf->flags)
ospf_router_lsa_update_area(area);
}
}
return 0;
}
/* network-LSA related functions. */
/* Originate Network-LSA. */
static void ospf_network_lsa_body_set(struct stream *s,
struct ospf_interface *oi)
{
struct in_addr mask;
struct route_node *rn;
struct ospf_neighbor *nbr;
masklen2ip(oi->address->prefixlen, &mask);
stream_put_ipv4(s, mask.s_addr);
/* The network-LSA lists those routers that are fully adjacent to
the Designated Router; each fully adjacent router is identified by
its OSPF Router ID. The Designated Router includes itself in this
list. RFC2328, Section 12.4.2 */
for (rn = route_top(oi->nbrs); rn; rn = route_next(rn))
if ((nbr = rn->info) != NULL)
if (nbr->state == NSM_Full || nbr == oi->nbr_self)
stream_put_ipv4(s, nbr->router_id.s_addr);
}
static struct ospf_lsa *ospf_network_lsa_new(struct ospf_interface *oi)
{
struct stream *s;
struct ospf_lsa *new;
struct lsa_header *lsah;
struct ospf_if_params *oip;
int length;
/* If there are no neighbours on this network (the net is stub),
the router does not originate network-LSA (see RFC 12.4.2) */
if (oi->full_nbrs == 0)
return NULL;
if (IS_DEBUG_OSPF(lsa, LSA_GENERATE))
zlog_debug("LSA[Type2]: Create network-LSA instance");
/* Create new stream for LSA. */
s = stream_new(OSPF_MAX_LSA_SIZE);
lsah = (struct lsa_header *)STREAM_DATA(s);
lsa_header_set(s, (OPTIONS(oi) | LSA_OPTIONS_GET(oi->area)),
OSPF_NETWORK_LSA, DR(oi), oi->ospf->router_id);