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netfilter: nf_tables: fix goto action 

This patch fixes a crash when trying to access the counters and the
default chain policy from the non-base chain that we have reached
via the goto chain. Fix this by falling back on the original base
chain after returning from the custom chain.

While fixing this, kill the inline function to account chain statistics
to improve source code readability.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2014-05-10 18:33:11 +02:00
parent d088be8042
commit 5467a51221
1 changed files with 10 additions and 18 deletions
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28
net/netfilter/nf_tables_core.c
View File

@ -66,20 +66,6 @@ struct nft_jumpstack {
int rulenum;
};
static inline void
nft_chain_stats(const struct nft_chain *this, const struct nft_pktinfo *pkt,
struct nft_jumpstack *jumpstack, unsigned int stackptr)
{
struct nft_stats __percpu *stats;
const struct nft_chain *chain = stackptr ? jumpstack[0].chain : this;
rcu_read_lock_bh();
stats = rcu_dereference(nft_base_chain(chain)->stats);
__this_cpu_inc(stats->pkts);
__this_cpu_add(stats->bytes, pkt->skb->len);
rcu_read_unlock_bh();
}
enum nft_trace {
NFT_TRACE_RULE,
NFT_TRACE_RETURN,
@ -117,12 +103,13 @@ static void nft_trace_packet(const struct nft_pktinfo *pkt,
unsigned int
nft_do_chain(struct nft_pktinfo *pkt, const struct nf_hook_ops *ops)
{
const struct nft_chain *chain = ops->priv;
const struct nft_chain *chain = ops->priv, *basechain = chain;
const struct nft_rule *rule;
const struct nft_expr *expr, *last;
struct nft_data data[NFT_REG_MAX + 1];
unsigned int stackptr = 0;
struct nft_jumpstack jumpstack[NFT_JUMP_STACK_SIZE];
struct nft_stats __percpu *stats;
int rulenum;
/*
* Cache cursor to avoid problems in case that the cursor is updated
@ -209,12 +196,17 @@ nft_do_chain(struct nft_pktinfo *pkt, const struct nf_hook_ops *ops)
rulenum = jumpstack[stackptr].rulenum;
goto next_rule;
}
nft_chain_stats(chain, pkt, jumpstack, stackptr);
if (unlikely(pkt->skb->nf_trace))
nft_trace_packet(pkt, chain, ++rulenum, NFT_TRACE_POLICY);
nft_trace_packet(pkt, basechain, ++rulenum, NFT_TRACE_POLICY);
return nft_base_chain(chain)->policy;
rcu_read_lock_bh();
stats = rcu_dereference(nft_base_chain(basechain)->stats);
__this_cpu_inc(stats->pkts);
__this_cpu_add(stats->bytes, pkt->skb->len);
rcu_read_unlock_bh();
return nft_base_chain(basechain)->policy;
}
EXPORT_SYMBOL_GPL(nft_do_chain);