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netfilter: nft_meta: use skb_to_full_sk() helper 

SYNACK packets might be attached to request sockets.

Fixes: ca6fb06518 ("tcp: attach SYNACK messages to request sockets instead of listener")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2015-11-08 10:54:12 -08:00 committed by David S. Miller
parent 02a56c81cf
commit 3aed822591
1 changed files with 20 additions and 16 deletions
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36
net/netfilter/nft_meta.c
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@ -31,6 +31,7 @@ void nft_meta_get_eval(const struct nft_expr *expr,
const struct nft_meta *priv = nft_expr_priv(expr);
const struct sk_buff *skb = pkt->skb;
const struct net_device *in = pkt->in, *out = pkt->out;
struct sock *sk;
u32 *dest = &regs->data[priv->dreg];
switch (priv->key) {
@ -86,33 +87,35 @@ void nft_meta_get_eval(const struct nft_expr *expr,
*(u16 *)dest = out->type;
break;
case NFT_META_SKUID:
if (skb->sk == NULL || !sk_fullsock(skb->sk))
sk = skb_to_full_sk(skb);
if (!sk || !sk_fullsock(sk))
goto err;
read_lock_bh(&skb->sk->sk_callback_lock);
if (skb->sk->sk_socket == NULL ||
skb->sk->sk_socket->file == NULL) {
read_unlock_bh(&skb->sk->sk_callback_lock);
read_lock_bh(&sk->sk_callback_lock);
if (sk->sk_socket == NULL ||
sk->sk_socket->file == NULL) {
read_unlock_bh(&sk->sk_callback_lock);
goto err;
}
*dest = from_kuid_munged(&init_user_ns,
skb->sk->sk_socket->file->f_cred->fsuid);
read_unlock_bh(&skb->sk->sk_callback_lock);
sk->sk_socket->file->f_cred->fsuid);
read_unlock_bh(&sk->sk_callback_lock);
break;
case NFT_META_SKGID:
if (skb->sk == NULL || !sk_fullsock(skb->sk))
sk = skb_to_full_sk(skb);
if (!sk || !sk_fullsock(sk))
goto err;
read_lock_bh(&skb->sk->sk_callback_lock);
if (skb->sk->sk_socket == NULL ||
skb->sk->sk_socket->file == NULL) {
read_unlock_bh(&skb->sk->sk_callback_lock);
read_lock_bh(&sk->sk_callback_lock);
if (sk->sk_socket == NULL ||
sk->sk_socket->file == NULL) {
read_unlock_bh(&sk->sk_callback_lock);
goto err;
}
*dest = from_kgid_munged(&init_user_ns,
skb->sk->sk_socket->file->f_cred->fsgid);
read_unlock_bh(&skb->sk->sk_callback_lock);
sk->sk_socket->file->f_cred->fsgid);
read_unlock_bh(&sk->sk_callback_lock);
break;
#ifdef CONFIG_IP_ROUTE_CLASSID
case NFT_META_RTCLASSID: {
@ -168,9 +171,10 @@ void nft_meta_get_eval(const struct nft_expr *expr,
break;
#ifdef CONFIG_CGROUP_NET_CLASSID
case NFT_META_CGROUP:
if (skb->sk == NULL || !sk_fullsock(skb->sk))
sk = skb_to_full_sk(skb);
if (!sk || !sk_fullsock(sk))
goto err;
*dest = skb->sk->sk_classid;
*dest = sk->sk_classid;
break;
#endif
default: