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Fix OSPF protocol error recovery behavior.

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When OSPF neighbor state drops down to EXSTART,
clear LSA request and retransmit lists, as specified
by RFC. I hope that this will prevent oscillations
between EXSTART and LOADING states, which sometimes
happened.

It also contains related fix from Yury Shevchuk that
properly resets DB summary list iterator.
This commit is contained in:
Ondrej Zajicek 2009-01-13 19:15:49 +01:00
parent f15cb99c79
commit 0844b65d13
4 changed files with 51 additions and 21 deletions
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4
proto/ospf/dbdes.c
View file

@ -113,8 +113,8 @@ ospf_dbdes_send(struct ospf_neighbor *n)
DBG("M bit unset.\n");
n->myimms.bit.m = 0; /* Unset more bit */
}
else
s_put(&(n->dbsi), sn);
s_put(&(n->dbsi), sn);
}
pkt->imms.byte = n->myimms.byte;

63
proto/ospf/neighbor.c
View file

@ -25,15 +25,42 @@ const char *ospf_inm[] =
"inactivity timer", "line down"
};
static void neigh_chstate(struct ospf_neighbor *n, u8 state);
static struct ospf_neighbor *electbdr(list nl);
static struct ospf_neighbor *electdr(list nl);
static void neighbor_timer_hook(timer * timer);
static void rxmt_timer_hook(timer * timer);
static void ackd_timer_hook(timer * t);
void neighbor_timer_hook(timer * timer);
void rxmt_timer_hook(timer * timer);
void ackd_timer_hook(timer * t);
static void
init_lists(struct ospf_neighbor *n)
{
s_init_list(&(n->lsrql));
n->lsrqh = ospf_top_new(n->pool);
s_init(&(n->lsrqi), &(n->lsrql));
s_init_list(&(n->lsrtl));
n->lsrth = ospf_top_new(n->pool);
s_init(&(n->lsrti), &(n->lsrtl));
}
/* Resets LSA request and retransmit list.
* We do not reset DB summary list iterator here,
* it is reset during entering EXCHANGE state.
*/
static void
reset_lists(struct ospf_neighbor *n)
{
ospf_top_free(n->lsrqh);
ospf_top_free(n->lsrth);
init_lists(n);
}
struct ospf_neighbor *
ospf_neighbor_new(struct ospf_iface *ifa)
{
struct proto *p = (struct proto *) (ifa->oa->po);
struct proto_ospf *po = ifa->oa->po;
struct pool *pool = rp_new(p->pool, "OSPF Neighbor");
struct ospf_neighbor *n = mb_allocz(pool, sizeof(struct ospf_neighbor));
@ -45,6 +72,9 @@ ospf_neighbor_new(struct ospf_iface *ifa)
n->ldbdes = mb_allocz(pool, ifa->iface->mtu);
n->state = NEIGHBOR_DOWN;
init_lists(n);
s_init(&(n->dbsi), &(po->lsal));
n->inactim = tm_new(pool);
n->inactim->data = n;
n->inactim->randomize = 0;
@ -57,12 +87,6 @@ ospf_neighbor_new(struct ospf_iface *ifa)
n->rxmt_timer->randomize = 0;
n->rxmt_timer->hook = rxmt_timer_hook;
n->rxmt_timer->recurrent = ifa->rxmtint;
s_init_list(&(n->lsrql));
n->lsrqh = ospf_top_new(pool);
s_init_list(&(n->lsrtl));
n->lsrth = ospf_top_new(pool);
s_init(&(n->lsrqi), &(n->lsrql));
s_init(&(n->lsrti), &(n->lsrtl));
tm_start(n->rxmt_timer, n->ifa->rxmtint);
DBG("%s: Installing rxmt timer.\n", p->name);
@ -88,7 +112,7 @@ ospf_neighbor_new(struct ospf_iface *ifa)
* starts rxmt timers, call interface state machine etc.
*/
void
static void
neigh_chstate(struct ospf_neighbor *n, u8 state)
{
u8 oldstate;
@ -143,7 +167,7 @@ neigh_chstate(struct ospf_neighbor *n, u8 state)
}
}
struct ospf_neighbor *
static struct ospf_neighbor *
electbdr(list nl)
{
struct ospf_neighbor *neigh, *n1, *n2;
@ -194,7 +218,7 @@ electbdr(list nl)
return (n1);
}
struct ospf_neighbor *
static struct ospf_neighbor *
electdr(list nl)
{
struct ospf_neighbor *neigh, *n;
@ -323,7 +347,11 @@ ospf_neigh_sm(struct ospf_neighbor *n, int event)
if (n->state == NEIGHBOR_EXSTART)
{
neigh_chstate(n, NEIGHBOR_EXCHANGE);
/* Reset DB summary list iterator */
s_get(&(n->dbsi));
s_init(&(n->dbsi), &po->lsal);
while (!EMPTY_LIST(n->ackl[ACKL_DELAY]))
{
struct lsah_n *no;
@ -355,6 +383,7 @@ ospf_neigh_sm(struct ospf_neighbor *n, int event)
if (n->state >= NEIGHBOR_EXSTART)
if (!can_do_adj(n))
{
reset_lists(n);
neigh_chstate(n, NEIGHBOR_2WAY);
}
break;
@ -364,15 +393,18 @@ ospf_neigh_sm(struct ospf_neighbor *n, int event)
case INM_BADLSREQ:
if (n->state >= NEIGHBOR_EXCHANGE)
{
reset_lists(n);
neigh_chstate(n, NEIGHBOR_EXSTART);
}
break;
case INM_KILLNBR:
case INM_LLDOWN:
case INM_INACTTIM:
reset_lists(n);
neigh_chstate(n, NEIGHBOR_DOWN);
break;
case INM_1WAYREC:
reset_lists(n);
neigh_chstate(n, NEIGHBOR_INIT);
break;
default:
@ -539,7 +571,7 @@ ospf_find_area(struct proto_ospf *po, u32 aid)
}
/* Neighbor is inactive for a long time. Remove it. */
void
static void
neighbor_timer_hook(timer * timer)
{
struct ospf_neighbor *n = (struct ospf_neighbor *) timer->data;
@ -558,6 +590,7 @@ ospf_neigh_remove(struct ospf_neighbor *n)
struct ospf_iface *ifa = n->ifa;
struct proto *p = &ifa->oa->po->proto;
s_get(&(n->dbsi));
neigh_chstate(n, NEIGHBOR_DOWN);
rem_node(NODE n);
rfree(n->pool);
@ -596,7 +629,7 @@ ospf_sh_neigh_info(struct ospf_neighbor *n)
(ifa->type == OSPF_IT_VLINK ? "vlink" : ifa->iface->name));
}
void
static void
rxmt_timer_hook(timer * timer)
{
struct ospf_neighbor *n = (struct ospf_neighbor *) timer->data;
@ -649,7 +682,7 @@ rxmt_timer_hook(timer * timer)
}
}
void
static void
ackd_timer_hook(timer * t)
{
struct ospf_neighbor *n = t->data;

3
proto/ospf/neighbor.h
View file

@ -11,9 +11,6 @@
#define _BIRD_OSPF_NEIGHBOR_H_
struct ospf_neighbor *ospf_neighbor_new(struct ospf_iface *ifa);
void neigh_chstate(struct ospf_neighbor *n, u8 state);
struct ospf_neighbor *electbdr(list nl);
struct ospf_neighbor *electdr(list nl);
void ospf_neigh_sm(struct ospf_neighbor *n, int event);
void bdr_election(struct ospf_iface *ifa);
struct ospf_neighbor *find_neigh(struct ospf_iface *ifa, u32 rid);