path: root/src/conntrack/build_mnl.c
diff options
authorFlorian Westphal <>2012-11-06 17:06:39 +0100
committerFlorian Westphal <>2013-05-06 21:34:15 +0200
commit6510a98f4139f112a0c76c71ff889ef93eac41fb (patch)
tree01e2ee90772ff378629bd889d51a509a26d3098e /src/conntrack/build_mnl.c
parent013a5284c901a6ce80320f499685b89d15eeed9e (diff)
api: add connlabel api and attribute
adds new labelmap api to create a name <-> bit mapping from a text file (default: /etc/xtables/connlabel.conf). nfct_labelmap_new(filename) is used to create the map, nfct_labelmap_destroy() releases the resources allocated for the map. Two functions are added to make map lookups: nfct_labelmap_get_name(map, bit) returns the name of a bit, nfct_labelmap_get_bit returns the bit associated with a name. The connlabel attribute is represented by a nfct_bitmask object, the nfct_bitmask api can be used to test/set/get individual bits ("labels"). The exisiting nfct_attr_get/set interfaces can be used to read or replace the existing labels associated with a conntrack with a new set. Signed-off-by: Florian Westphal <>
Diffstat (limited to 'src/conntrack/build_mnl.c')
1 files changed, 12 insertions, 0 deletions
diff --git a/src/conntrack/build_mnl.c b/src/conntrack/build_mnl.c
index 46aec8a..a666e01 100644
--- a/src/conntrack/build_mnl.c
+++ b/src/conntrack/build_mnl.c
@@ -10,6 +10,7 @@
#include "internal/internal.h"
+#include <limits.h>
#include <libmnl/libmnl.h>
static int
@@ -379,6 +380,14 @@ nfct_build_zone(struct nlmsghdr *nlh, const struct nf_conntrack *ct)
return 0;
+static void
+nfct_build_labels(struct nlmsghdr *nlh, const struct nf_conntrack *ct)
+ struct nfct_bitmask *b = ct->connlabels;
+ unsigned int size = b->words * sizeof(b->bits[0]);
+ mnl_attr_put(nlh, CTA_LABELS, size, b->bits);
nfct_nlmsg_build(struct nlmsghdr *nlh, const struct nf_conntrack *ct)
@@ -475,5 +484,8 @@ nfct_nlmsg_build(struct nlmsghdr *nlh, const struct nf_conntrack *ct)
if (test_bit(ATTR_ZONE, ct->head.set))
nfct_build_zone(nlh, ct);
+ if (test_bit(ATTR_CONNLABELS, ct->head.set))
+ nfct_build_labels(nlh, ct);
return 0;