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authorLennart Poettering <lennart@poettering.net>2016-02-21 14:11:34 +0100
committerLennart Poettering <lennart@poettering.net>2016-02-21 20:40:58 +0100
commitb553a6b13c68cb72addde48281abe3f3b46e16a4 (patch)
treed8f8548603e1bd3a2812257eae233fba546e2e24 /src/libsystemd-network/sd-lldp.c
parent33859a6bf5fd2b62a562a751a509708617e19776 (diff)
sd-lldp: filter out LLDP messages coming from our own MAC address
Let's not get confused should we be connected to some bridge that mirrors back our packets.
Diffstat (limited to 'src/libsystemd-network/sd-lldp.c')
-rw-r--r--src/libsystemd-network/sd-lldp.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/src/libsystemd-network/sd-lldp.c b/src/libsystemd-network/sd-lldp.c
index 65cfa4e184..3af6133a4e 100644
--- a/src/libsystemd-network/sd-lldp.c
+++ b/src/libsystemd-network/sd-lldp.c
@@ -28,6 +28,7 @@
#include "lldp-neighbor.h"
#include "lldp-network.h"
#include "socket-util.h"
+#include "ether-addr-util.h"
#define LLDP_DEFAULT_NEIGHBORS_MAX 128U
@@ -99,6 +100,11 @@ static int lldp_add_neighbor(sd_lldp *lldp, sd_lldp_neighbor *n) {
if (n->ttl <= 0)
return changed;
+ /* Filter out the filter address */
+ if (!ether_addr_is_null(&lldp->filter_address) &&
+ ether_addr_equal(&lldp->filter_address, &n->source_address))
+ return changed;
+
/* Only add if the neighbor has a capability we are interested in. Note that we also store all neighbors with
* no caps field set. */
if (n->has_capabilities &&
@@ -438,3 +444,18 @@ _public_ int sd_lldp_match_capabilities(sd_lldp *lldp, uint16_t mask) {
return 0;
}
+
+_public_ int sd_lldp_set_filter_address(sd_lldp *lldp, const struct ether_addr *addr) {
+ assert_return(lldp, -EINVAL);
+
+ /* In order to deal nicely with bridges that send back our own packets, allow one address to be filtered, so
+ * that our own can be filtered out here. */
+
+ if (!addr) {
+ zero(lldp->filter_address);
+ return 0;
+ }
+
+ lldp->filter_address = *addr;
+ return 0;
+}