netfilter: nf_tables: fix racy rule deletion

We may lost race if we flush the rule-set (which happens asynchronously
via call_rcu) and we try to remove the table (that userspace assumes
to be empty).

Fix this by recovering synchronous rule and chain deletion. This was
introduced time ago before we had no batch support, and synchronous
rule deletion performance was not good. Now that we have the batch
support, we can just postpone the purge of old rule in a second step
in the commit phase. All object deletions are synchronous after this
patch.

As a side effect, we save memory as we don't need rcu_head per rule
anymore.

Cc: Patrick McHardy <kaber@trash.net>
Reported-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 23 insertions, 17 deletions

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 113c469..3a2e480 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -1008,10 +1008,8 @@ notify:
 	return 0;
 }
 
-static void nf_tables_rcu_chain_destroy(struct rcu_head *head)
+static void nf_tables_chain_destroy(struct nft_chain *chain)
 {
-	struct nft_chain *chain = container_of(head, struct nft_chain, rcu_head);
-
 	BUG_ON(chain->use > 0);
 
 	if (chain->flags & NFT_BASE_CHAIN) {
@@ -1059,7 +1057,9 @@ static int nf_tables_delchain(struct sock *nlsk, struct sk_buff *skb,
 			       family);
 
 	/* Make sure all rule references are gone before this is released */
-	call_rcu(&chain->rcu_head, nf_tables_rcu_chain_destroy);
+	synchronize_rcu();
+
+	nf_tables_chain_destroy(chain);
 	return 0;
 }
 
@@ -1531,9 +1531,8 @@ err:
 	return err;
 }
 
-static void nf_tables_rcu_rule_destroy(struct rcu_head *head)
+static void nf_tables_rule_destroy(struct nft_rule *rule)
 {
-	struct nft_rule *rule = container_of(head, struct nft_rule, rcu_head);
 	struct nft_expr *expr;
 
 	/*
@@ -1548,11 +1547,6 @@ static void nf_tables_rcu_rule_destroy(struct rcu_head *head)
 	kfree(rule);
 }
 
-static void nf_tables_rule_destroy(struct nft_rule *rule)
-{
-	call_rcu(&rule->rcu_head, nf_tables_rcu_rule_destroy);
-}
-
 #define NFT_RULE_MAXEXPRS	128
 
 static struct nft_expr_info *info;
@@ -1819,9 +1813,6 @@ static int nf_tables_commit(struct sk_buff *skb)
 	synchronize_rcu();
 
 	list_for_each_entry_safe(rupd, tmp, &net->nft.commit_list, list) {
-		/* Delete this rule from the dirty list */
-		list_del(&rupd->list);
-
 		/* This rule was inactive in the past and just became active.
 		 * Clear the next bit of the genmask since its meaning has
 		 * changed, now it is the future.
@@ -1832,6 +1823,7 @@ static int nf_tables_commit(struct sk_buff *skb)
 					      rupd->chain, rupd->rule,
 					      NFT_MSG_NEWRULE, 0,
 					      rupd->family);
+			list_del(&rupd->list);
 			kfree(rupd);
 			continue;
 		}
@@ -1841,7 +1833,15 @@ static int nf_tables_commit(struct sk_buff *skb)
 		nf_tables_rule_notify(skb, rupd->nlh, rupd->table, rupd->chain,
 				      rupd->rule, NFT_MSG_DELRULE, 0,
 				      rupd->family);
+	}
+
+	/* Make sure we don't see any packet traversing old rules */
+	synchronize_rcu();
+
+	/* Now we can safely release unused old rules */
+	list_for_each_entry_safe(rupd, tmp, &net->nft.commit_list, list) {
 		nf_tables_rule_destroy(rupd->rule);
+		list_del(&rupd->list);
 		kfree(rupd);
 	}
 
@@ -1854,20 +1854,26 @@ static int nf_tables_abort(struct sk_buff *skb)
 	struct nft_rule_trans *rupd, *tmp;
 
 	list_for_each_entry_safe(rupd, tmp, &net->nft.commit_list, list) {
-		/* Delete all rules from the dirty list */
-		list_del(&rupd->list);
-
 		if (!nft_rule_is_active_next(net, rupd->rule)) {
 			nft_rule_clear(net, rupd->rule);
+			list_del(&rupd->list);
 			kfree(rupd);
 			continue;
 		}
 
 		/* This rule is inactive, get rid of it */
 		list_del_rcu(&rupd->rule->list);
+	}
+
+	/* Make sure we don't see any packet accessing aborted rules */
+	synchronize_rcu();
+
+	list_for_each_entry_safe(rupd, tmp, &net->nft.commit_list, list) {
 		nf_tables_rule_destroy(rupd->rule);
+		list_del(&rupd->list);
 		kfree(rupd);
 	}
+
 	return 0;
 }