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netfilter: nft_meta: move sk uid/git handling to helper 

Not a hot path.  Also, both have copy&paste case statements,
so use a common helper for both.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2019-12-18 12:05:15 +01:00 committed by Pablo Neira Ayuso
parent 4a54594abd
commit 726b44f044
1 changed files with 36 additions and 29 deletions
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65
net/netfilter/nft_meta.c
View File

@ -126,6 +126,41 @@ nft_meta_get_eval_pkttype_lo(const struct nft_pktinfo *pkt,
return true;
}
static noinline bool
nft_meta_get_eval_skugid(enum nft_meta_keys key,
u32 *dest,
const struct nft_pktinfo *pkt)
{
struct sock *sk = skb_to_full_sk(pkt->skb);
struct socket *sock;
if (!sk || !sk_fullsock(sk) || !net_eq(nft_net(pkt), sock_net(sk)))
return false;
read_lock_bh(&sk->sk_callback_lock);
sock = sk->sk_socket;
if (!sock || !sock->file) {
read_unlock_bh(&sk->sk_callback_lock);
return false;
}
switch (key) {
case NFT_META_SKUID:
*dest = from_kuid_munged(&init_user_ns,
sock->file->f_cred->fsuid);
break;
case NFT_META_SKGID:
*dest = from_kgid_munged(&init_user_ns,
sock->file->f_cred->fsgid);
break;
default:
break;
}
read_unlock_bh(&sk->sk_callback_lock);
return true;
}
void nft_meta_get_eval(const struct nft_expr *expr,
struct nft_regs *regs,
const struct nft_pktinfo *pkt)
@ -180,37 +215,9 @@ void nft_meta_get_eval(const struct nft_expr *expr,
nft_reg_store16(dest, out->type);
break;
case NFT_META_SKUID:
sk = skb_to_full_sk(skb);
if (!sk || !sk_fullsock(sk) ||
!net_eq(nft_net(pkt), sock_net(sk)))
goto err;
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,
sk->sk_socket->file->f_cred->fsuid);
read_unlock_bh(&sk->sk_callback_lock);
break;
case NFT_META_SKGID:
sk = skb_to_full_sk(skb);
if (!sk || !sk_fullsock(sk) ||
!net_eq(nft_net(pkt), sock_net(sk)))
if (!nft_meta_get_eval_skugid(priv->key, dest, pkt))
goto err;
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,
sk->sk_socket->file->f_cred->fsgid);
read_unlock_bh(&sk->sk_callback_lock);
break;
#ifdef CONFIG_IP_ROUTE_CLASSID
case NFT_META_RTCLASSID: {