@@ -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 @@ next_rule:
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);
+
+ 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(chain)->policy;
+ return nft_base_chain(basechain)->policy;
}
EXPORT_SYMBOL_GPL(nft_do_chain);
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> --- net/netfilter/nf_tables_core.c | 28 ++++++++++------------------ 1 file changed, 10 insertions(+), 18 deletions(-)