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Babel: Seqno requests are properly decoupled from neighbors when the underlying interface disappears 

When an interface disappears, all the neighbors are freed as well. Seqno
requests were anyway not decoupled from them, leading to strange
segfaults. This fix adds a proper seqno request list inside neighbors to
make sure that no pointer to neighbor is kept after free.
This commit is contained in:
Maria Matejka 2021-05-30 13:07:16 +02:00
parent 10498b8e89
commit ebd5751cde
3 changed files with 22 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
lib/lists.h
View File

@ -59,6 +59,8 @@ typedef union list { /* In fact two overlayed nodes */
/* WALK_LIST_FIRST supposes that called code removes each processed node */
#define WALK_LIST_FIRST(n,list) \
while(n=HEAD(list), (NODE (n))->next)
#define WALK_LIST_FIRST2(n,pos,list) \
while(n=SKIP_BACK(typeof(*n),pos,HEAD(list)), (n)->pos.next)
#define WALK_LIST_BACKWARDS(n,list) for(n=TAIL(list);(NODE (n))->prev; \
n=(void *)((NODE (n))->prev))
#define WALK_LIST_BACKWARDS_DELSAFE(n,prv,list) \

30
proto/babel/babel.c
View File

@ -56,13 +56,6 @@ static void babel_update_cost(struct babel_neighbor *n);
static inline void babel_kick_timer(struct babel_proto *p);
static inline void babel_iface_kick_timer(struct babel_iface *ifa);
static inline void babel_lock_neighbor(struct babel_neighbor *nbr)
{ if (nbr) nbr->uc++; }
static inline void babel_unlock_neighbor(struct babel_neighbor *nbr)
{ if (nbr && !--nbr->uc) mb_free(nbr); }
/*
* Functions to maintain data structures
*/
@ -316,8 +309,9 @@ babel_add_seqno_request(struct babel_proto *p, struct babel_entry *e,
return;
/* Found older */
babel_unlock_neighbor(sr->nbr);
rem_node(NODE sr);
rem_node(&sr->nbr_node);
goto found;
}
@ -330,7 +324,10 @@ found:
sr->hop_count = hop_count;
sr->count = 0;
sr->expires = current_time() + BABEL_SEQNO_REQUEST_EXPIRY;
babel_lock_neighbor(sr->nbr = nbr);
if (sr->nbr = nbr)
add_tail(&nbr->requests, &sr->nbr_node);
add_tail(&e->requests, NODE sr);
babel_send_seqno_request(p, e, sr);
@ -339,7 +336,9 @@ found:
static void
babel_remove_seqno_request(struct babel_proto *p, struct babel_seqno_request *sr)
{
babel_unlock_neighbor(sr->nbr);
if (sr->nbr)
rem_node(&sr->nbr_node);
rem_node(NODE sr);
sl_free(p->seqno_slab, sr);
}
@ -427,7 +426,7 @@ babel_get_neighbor(struct babel_iface *ifa, ip_addr addr)
nbr->txcost = BABEL_INFINITY;
nbr->cost = BABEL_INFINITY;
init_list(&nbr->routes);
babel_lock_neighbor(nbr);
init_list(&nbr->requests);
add_tail(&ifa->neigh_list, NODE nbr);
return nbr;
@ -448,9 +447,16 @@ babel_flush_neighbor(struct babel_proto *p, struct babel_neighbor *nbr)
babel_flush_route(p, r);
}
struct babel_seqno_request *sr;
WALK_LIST_FIRST2(sr, nbr_node, nbr->requests)
{
sr->nbr = NULL;
rem_node(&sr->nbr_node);
}
nbr->ifa = NULL;
rem_node(NODE nbr);
babel_unlock_neighbor(nbr);
mb_free(nbr);
}
static void

3
proto/babel/babel.h
View File

@ -198,7 +198,6 @@ struct babel_neighbor {
struct babel_iface *ifa;
ip_addr addr;
uint uc; /* Reference counter for seqno requests */
u16 rxcost; /* Sent in last IHU */
u16 txcost; /* Received in last IHU */
u16 cost; /* Computed neighbor cost */
@ -212,6 +211,7 @@ struct babel_neighbor {
btime ihu_expiry;
list routes; /* Routes this neighbour has sent us (struct babel_route) */
list requests; /* Seqno requests bound to this neighbor */
};
struct babel_source {
@ -241,6 +241,7 @@ struct babel_route {
struct babel_seqno_request {
node n;
node nbr_node;
u64 router_id;
u16 seqno;
u8 hop_count;