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netfilter: nft_meta: move cgroup handling to helper 

Reduce size of main eval function.

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 12:05:16 +01:00 committed by Pablo Neira Ayuso
parent 726b44f044
commit b1327fbc29
1 changed files with 15 additions and 5 deletions
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20
net/netfilter/nft_meta.c
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@ -161,6 +161,20 @@ nft_meta_get_eval_skugid(enum nft_meta_keys key,
return true;
}
#ifdef CONFIG_CGROUP_NET_CLASSID
static noinline bool
nft_meta_get_eval_cgroup(u32 *dest, const struct nft_pktinfo *pkt)
{
struct sock *sk = skb_to_full_sk(pkt->skb);
if (!sk || !sk_fullsock(sk) || !net_eq(nft_net(pkt), sock_net(sk)))
return false;
*dest = sock_cgroup_classid(&sk->sk_cgrp_data);
return true;
}
#endif
void nft_meta_get_eval(const struct nft_expr *expr,
struct nft_regs *regs,
const struct nft_pktinfo *pkt)
@ -168,7 +182,6 @@ 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 = nft_in(pkt), *out = nft_out(pkt);
struct sock *sk;
u32 *dest = &regs->data[priv->dreg];
switch (priv->key) {
@ -258,11 +271,8 @@ void nft_meta_get_eval(const struct nft_expr *expr,
break;
#ifdef CONFIG_CGROUP_NET_CLASSID
case NFT_META_CGROUP:
sk = skb_to_full_sk(skb);
if (!sk || !sk_fullsock(sk) ||
!net_eq(nft_net(pkt), sock_net(sk)))
if (!nft_meta_get_eval_cgroup(dest, pkt))
goto err;
*dest = sock_cgroup_classid(&sk->sk_cgrp_data);
break;
#endif
case NFT_META_PRANDOM: {