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tcp: md5: use sock_kmalloc() to limit md5 keys 

There is no limit on number of MD5 keys an application can attach to a
tcp socket.

This patch adds a per tcp socket limit based
on /proc/sys/net/core/optmem_max

With current default optmem_max values, this allows about 150 keys on
64bit arches, and 88 keys on 32bit arches.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2012-01-31 10:56:48 +00:00 committed by David S. Miller
parent a915da9b69
commit 5f3d9cb296
1 changed files with 4 additions and 2 deletions
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6
net/ipv4/tcp_ipv4.c
View File

@ -943,11 +943,11 @@ int tcp_md5_do_add(struct sock *sk, const union tcp_md5_addr *addr,
tp->md5sig_info = md5sig;
}
key = kmalloc(sizeof(*key), gfp);
key = sock_kmalloc(sk, sizeof(*key), gfp);
if (!key)
return -ENOMEM;
if (hlist_empty(&md5sig->head) && !tcp_alloc_md5sig_pool(sk)) {
kfree(key);
sock_kfree_s(sk, key, sizeof(*key));
return -ENOMEM;
}
@ -971,6 +971,7 @@ int tcp_md5_do_del(struct sock *sk, const union tcp_md5_addr *addr, int family)
if (!key)
return -ENOENT;
hlist_del_rcu(&key->node);
atomic_sub(sizeof(*key), &sk->sk_omem_alloc);
kfree_rcu(key, rcu);
if (hlist_empty(&tp->md5sig_info->head))
tcp_free_md5sig_pool();
@ -988,6 +989,7 @@ void tcp_clear_md5_list(struct sock *sk)
tcp_free_md5sig_pool();
hlist_for_each_entry_safe(key, pos, n, &tp->md5sig_info->head, node) {
hlist_del_rcu(&key->node);
atomic_sub(sizeof(*key), &sk->sk_omem_alloc);
kfree_rcu(key, rcu);
}
}