netfilter: add connlabel conntrack extension
similar to connmarks, except labels are bit-based; i.e.
all labels may be attached to a flow at the same time.
Up to 128 labels are supported. Supporting more labels
is possible, but requires increasing the ct offset delta
from u8 to u16 type due to increased extension sizes.
Mapping of bit-identifier to label name is done in userspace.
The extension is enabled at run-time once "-m connlabel" netfilter
rules are added.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
diff --git a/include/net/netfilter/nf_conntrack_extend.h b/include/net/netfilter/nf_conntrack_extend.h
index 8b4d1fc2..977bc8a 100644
--- a/include/net/netfilter/nf_conntrack_extend.h
+++ b/include/net/netfilter/nf_conntrack_extend.h
@@ -23,6 +23,9 @@
#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
NF_CT_EXT_TIMEOUT,
#endif
+#ifdef CONFIG_NF_CONNTRACK_LABELS
+ NF_CT_EXT_LABELS,
+#endif
NF_CT_EXT_NUM,
};
@@ -33,6 +36,7 @@
#define NF_CT_EXT_ZONE_TYPE struct nf_conntrack_zone
#define NF_CT_EXT_TSTAMP_TYPE struct nf_conn_tstamp
#define NF_CT_EXT_TIMEOUT_TYPE struct nf_conn_timeout
+#define NF_CT_EXT_LABELS_TYPE struct nf_conn_labels
/* Extensions: optional stuff which isn't permanently in struct. */
struct nf_ct_ext {