Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf
Pablo Neira Ayuso says:
====================
Netfilter/nftables fixes for net
The following patchset contains nftables fixes for your net tree, they
are:
1) Fix crash when using the goto action in a rule by making sure that
we always fall back on the base chain. Otherwise, this may try to
access the counter memory area of non-base chains, which does not
exists.
2) Fix several aspects of the rule tracing that are currently broken:
* Reset rule number counter after goto/jump action, otherwise the
tracing reports a bogus rule number.
* Fix tracing of the goto action.
* Fix bogus rule number counter after goto.
* Fix missing return trace after finishing the walk through the
non-base chain.
* Fix missing trace when matching non-terminal rule.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/netfilter/nf_tables_core.c b/net/netfilter/nf_tables_core.c
index 8041053..345acfb 100644
--- a/net/netfilter/nf_tables_core.c
+++ b/net/netfilter/nf_tables_core.c
@@ -66,20 +66,6 @@
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,
@@ -117,13 +103,14 @@
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];
- int rulenum = 0;
+ struct nft_stats __percpu *stats;
+ int rulenum;
/*
* Cache cursor to avoid problems in case that the cursor is updated
* while traversing the ruleset.
@@ -131,6 +118,7 @@
unsigned int gencursor = ACCESS_ONCE(chain->net->nft.gencursor);
do_chain:
+ rulenum = 0;
rule = list_entry(&chain->rules, struct nft_rule, list);
next_rule:
data[NFT_REG_VERDICT].verdict = NFT_CONTINUE;
@@ -156,8 +144,10 @@
switch (data[NFT_REG_VERDICT].verdict) {
case NFT_BREAK:
data[NFT_REG_VERDICT].verdict = NFT_CONTINUE;
- /* fall through */
+ continue;
case NFT_CONTINUE:
+ if (unlikely(pkt->skb->nf_trace))
+ nft_trace_packet(pkt, chain, rulenum, NFT_TRACE_RULE);
continue;
}
break;
@@ -183,37 +173,44 @@
jumpstack[stackptr].rule = rule;
jumpstack[stackptr].rulenum = rulenum;
stackptr++;
- /* fall through */
+ chain = data[NFT_REG_VERDICT].chain;
+ goto do_chain;
case NFT_GOTO:
+ if (unlikely(pkt->skb->nf_trace))
+ nft_trace_packet(pkt, chain, rulenum, NFT_TRACE_RULE);
+
chain = data[NFT_REG_VERDICT].chain;
goto do_chain;
case NFT_RETURN:
if (unlikely(pkt->skb->nf_trace))
nft_trace_packet(pkt, chain, rulenum, NFT_TRACE_RETURN);
-
- /* fall through */
+ break;
case NFT_CONTINUE:
+ if (unlikely(pkt->skb->nf_trace && !(chain->flags & NFT_BASE_CHAIN)))
+ nft_trace_packet(pkt, chain, ++rulenum, NFT_TRACE_RETURN);
break;
default:
WARN_ON(1);
}
if (stackptr > 0) {
- if (unlikely(pkt->skb->nf_trace))
- nft_trace_packet(pkt, chain, ++rulenum, NFT_TRACE_RETURN);
-
stackptr--;
chain = jumpstack[stackptr].chain;
rule = jumpstack[stackptr].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, -1, 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);