Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf

Pablo Neira Ayuso says:

====================
Netfilter fixes for net

The following patchset contains three Netfilter fixes for your net tree,
they are:

* Fix missing generation sequence initialization which results in a splat
  if lockdep is enabled, it was introduced in the recent works to improve
  nf_conntrack scalability, from Andrey Vagin.

* Don't flush the GRE keymap list in nf_conntrack when the pptp helper is
  disabled otherwise this crashes due to a double release, from Andrey
  Vagin.

* Fix nf_tables cmp fast in big endian, from Patrick McHardy.
====================
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/linux/netfilter/nf_conntrack_proto_gre.h

@@ -87,7 +87,6 @@ int nf_ct_gre_keymap_add(struct nf_conn *ct, enum ip_conntrack_dir dir,
 /* delete keymap entries */
 void nf_ct_gre_keymap_destroy(struct nf_conn *ct);
 
-void nf_ct_gre_keymap_flush(struct net *net);
 void nf_nat_need_gre(void);
 
 #endif /* __KERNEL__ */

include/net/netfilter/nf_tables_core.h

@@ -13,6 +13,16 @@ struct nft_cmp_fast_expr {
 	u8			len;
 };
 
+/* Calculate the mask for the nft_cmp_fast expression. On big endian the
+ * mask needs to include the *upper* bytes when interpreting that data as
+ * something smaller than the full u32, therefore a cpu_to_le32 is done.
+ */
+static inline u32 nft_cmp_fast_mask(unsigned int len)
+{
+	return cpu_to_le32(~0U >> (FIELD_SIZEOF(struct nft_cmp_fast_expr,
+						data) * BITS_PER_BYTE - len));
+}
+
 extern const struct nft_expr_ops nft_cmp_fast_ops;
 
 int nft_cmp_module_init(void);

net/netfilter/nf_conntrack_core.c

@@ -1795,6 +1795,7 @@ int nf_conntrack_init_net(struct net *net)
 	int cpu;
 
 	atomic_set(&net->ct.count, 0);
+	seqcount_init(&net->ct.generation);
 
 	net->ct.pcpu_lists = alloc_percpu(struct ct_pcpu);
 	if (!net->ct.pcpu_lists)

net/netfilter/nf_conntrack_pptp.c

@@ -605,32 +605,14 @@ static struct nf_conntrack_helper pptp __read_mostly = {
 	.expect_policy		= &pptp_exp_policy,
 };
 
-static void nf_conntrack_pptp_net_exit(struct net *net)
-{
-	nf_ct_gre_keymap_flush(net);
-}
-
-static struct pernet_operations nf_conntrack_pptp_net_ops = {
-	.exit = nf_conntrack_pptp_net_exit,
-};
-
 static int __init nf_conntrack_pptp_init(void)
 {
-	int rv;
-
-	rv = nf_conntrack_helper_register(&pptp);
-	if (rv < 0)
-		return rv;
-	rv = register_pernet_subsys(&nf_conntrack_pptp_net_ops);
-	if (rv < 0)
-		nf_conntrack_helper_unregister(&pptp);
-	return rv;
+	return nf_conntrack_helper_register(&pptp);
 }
 
 static void __exit nf_conntrack_pptp_fini(void)
 {
 	nf_conntrack_helper_unregister(&pptp);
-	unregister_pernet_subsys(&nf_conntrack_pptp_net_ops);
 }
 
 module_init(nf_conntrack_pptp_init);

net/netfilter/nf_conntrack_proto_gre.c

@@ -66,7 +66,7 @@ static inline struct netns_proto_gre *gre_pernet(struct net *net)
 	return net_generic(net, proto_gre_net_id);
 }
 
-void nf_ct_gre_keymap_flush(struct net *net)
+static void nf_ct_gre_keymap_flush(struct net *net)
 {
 	struct netns_proto_gre *net_gre = gre_pernet(net);
 	struct nf_ct_gre_keymap *km, *tmp;
@@ -78,7 +78,6 @@ void nf_ct_gre_keymap_flush(struct net *net)
 	}
 	write_unlock_bh(&net_gre->keymap_lock);
 }
-EXPORT_SYMBOL(nf_ct_gre_keymap_flush);
 
 static inline int gre_key_cmpfn(const struct nf_ct_gre_keymap *km,
 				const struct nf_conntrack_tuple *t)

net/netfilter/nf_tables_core.c

@@ -25,9 +25,8 @@ static void nft_cmp_fast_eval(const struct nft_expr *expr,
 			      struct nft_data data[NFT_REG_MAX + 1])
 {
 	const struct nft_cmp_fast_expr *priv = nft_expr_priv(expr);
-	u32 mask;
+	u32 mask = nft_cmp_fast_mask(priv->len);
 
-	mask = ~0U >> (sizeof(priv->data) * BITS_PER_BYTE - priv->len);
 	if ((data[priv->sreg].data[0] & mask) == priv->data)
 		return;
 	data[NFT_REG_VERDICT].verdict = NFT_BREAK;

net/netfilter/nft_cmp.c

@@ -128,7 +128,7 @@ static int nft_cmp_fast_init(const struct nft_ctx *ctx,
 	BUG_ON(err < 0);
 	desc.len *= BITS_PER_BYTE;
 
-	mask = ~0U >> (sizeof(priv->data) * BITS_PER_BYTE - desc.len);
+	mask = nft_cmp_fast_mask(desc.len);
 	priv->data = data.data[0] & mask;
 	priv->len  = desc.len;
 	return 0;