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ipv4: use rcu in ip_fib_check_default()

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fib_info_devhash[] is not resized in fib_info_hash_move().

fib_nh structs are already freed after an rcu grace period.

This will allow to remove fib_info_lock in the following patch.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://patch.msgid.link/20241004134720.579244-3-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2024-10-04 13:47:18 +00:00 committed by Jakub Kicinski
parent 8a0f62fdeb
commit fc38b28365
1 changed files with 4 additions and 9 deletions
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13
net/ipv4/fib_semantics.c
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@ -275,7 +275,7 @@ void fib_release_info(struct fib_info *fi)
change_nexthops(fi) {
if (!nexthop_nh->fib_nh_dev)
continue;
hlist_del(&nexthop_nh->nh_hash);
hlist_del_rcu(&nexthop_nh->nh_hash);
} endfor_nexthops(fi)
}
/* Paired with READ_ONCE() from fib_table_lookup() */
@ -431,28 +431,23 @@ static struct fib_info *fib_find_info(struct fib_info *nfi)
}
/* Check, that the gateway is already configured.
* Used only by redirect accept routine.
* Used only by redirect accept routine, under rcu_read_lock();
*/
int ip_fib_check_default(__be32 gw, struct net_device *dev)
{
struct hlist_head *head;
struct fib_nh *nh;
spin_lock(&fib_info_lock);
head = fib_info_devhash_bucket(dev);
hlist_for_each_entry(nh, head, nh_hash) {
hlist_for_each_entry_rcu(nh, head, nh_hash) {
if (nh->fib_nh_dev == dev &&
nh->fib_nh_gw4 == gw &&
!(nh->fib_nh_flags & RTNH_F_DEAD)) {
spin_unlock(&fib_info_lock);
return 0;
}
}
spin_unlock(&fib_info_lock);
return -1;
}
@ -1606,7 +1601,7 @@ struct fib_info *fib_create_info(struct fib_config *cfg,
if (!nexthop_nh->fib_nh_dev)
continue;
head = fib_info_devhash_bucket(nexthop_nh->fib_nh_dev);
hlist_add_head(&nexthop_nh->nh_hash, head);
hlist_add_head_rcu(&nexthop_nh->nh_hash, head);
} endfor_nexthops(fi)
}
spin_unlock_bh(&fib_info_lock);