Merge branch 'master' of git://1984.lsi.us.es/nf-next

Pablo Neira Ayuso says:

====================
This batch contains netfilter updates for you net-next tree, they are:

* The new connlabel extension for x_tables, that allows us to attach
  labels to each conntrack flow. The kernel implementation uses a
  bitmask and there's a file in user-space that maps the bits with the
  corresponding string for each existing label. By now, you can attach
  up to 128 overlapping labels. From Florian Westphal.

* A new round of improvements for the netns support for conntrack.
  Gao feng has moved many of the initialization code of each module
  of the netns init path. He also made several code refactoring, that
  code looks cleaner to me now.

* Added documentation for all possible tweaks for nf_conntrack via
  sysctl, from Jiri Pirko.

* Cisco 7941/7945 IP phone support for our SIP conntrack helper,
  from Kevin Cernekee.

* Missing header file in the snmp helper, from Stephen Hemminger.

* Finally, a couple of fixes to resolve minor issues with these
  changes, from myself.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 58 insertions, 0 deletions

diff --git a/include/net/netfilter/nf_conntrack_labels.h b/include/net/netfilter/nf_conntrack_labels.h
new file mode 100644
index 00000000000..c985695283b
--- /dev/null
+++ b/include/net/netfilter/nf_conntrack_labels.h
@@ -0,0 +1,58 @@
+#include <linux/types.h>
+#include <net/net_namespace.h>
+#include <linux/netfilter/nf_conntrack_common.h>
+#include <linux/netfilter/nf_conntrack_tuple_common.h>
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_conntrack_extend.h>
+
+#include <uapi/linux/netfilter/xt_connlabel.h>
+
+struct nf_conn_labels {
+	u8 words;
+	unsigned long bits[];
+};
+
+static inline struct nf_conn_labels *nf_ct_labels_find(const struct nf_conn *ct)
+{
+#ifdef CONFIG_NF_CONNTRACK_LABELS
+	return nf_ct_ext_find(ct, NF_CT_EXT_LABELS);
+#else
+	return NULL;
+#endif
+}
+
+static inline struct nf_conn_labels *nf_ct_labels_ext_add(struct nf_conn *ct)
+{
+#ifdef CONFIG_NF_CONNTRACK_LABELS
+	struct nf_conn_labels *cl_ext;
+	struct net *net = nf_ct_net(ct);
+	u8 words;
+
+	words = ACCESS_ONCE(net->ct.label_words);
+	if (words == 0 || WARN_ON_ONCE(words > 8))
+		return NULL;
+
+	cl_ext = nf_ct_ext_add_length(ct, NF_CT_EXT_LABELS,
+				      words * sizeof(long), GFP_ATOMIC);
+	if (cl_ext != NULL)
+		cl_ext->words = words;
+
+	return cl_ext;
+#else
+	return NULL;
+#endif
+}
+
+bool nf_connlabel_match(const struct nf_conn *ct, u16 bit);
+int nf_connlabel_set(struct nf_conn *ct, u16 bit);
+
+int nf_connlabels_replace(struct nf_conn *ct,
+			  const u32 *data, const u32 *mask, unsigned int words);
+
+#ifdef CONFIG_NF_CONNTRACK_LABELS
+int nf_conntrack_labels_init(void);
+void nf_conntrack_labels_fini(void);
+#else
+static inline int nf_conntrack_labels_init(void) { return 0; }
+static inline void nf_conntrack_labels_fini(void) {}
+#endif