lldp: add sd_lldp_tlv_packet_get_destination_type()

It can be useful to know the destination address of a LLDP frame
because it determines the scope of propagation of the frame and thus
this information be used to know whether the neighbor is connected to
the same physical link.

See clause 7.1 of IEEE Std 802.1AB-2009.

1 files changed, 8 insertions, 0 deletions

diff --git a/src/systemd/sd-lldp.h b/src/systemd/sd-lldp.h
index e472cbece9..bf6dfc1ee0 100644
--- a/src/systemd/sd-lldp.h
+++ b/src/systemd/sd-lldp.h
@@ -28,6 +28,12 @@ enum {
         SD_LLDP_EVENT_UPDATE_INFO       = 0,
 };
 
+enum {
+        SD_LLDP_DESTINATION_TYPE_NEAREST_BRIDGE,
+        SD_LLDP_DESTINATION_TYPE_NEAREST_NON_TPMR_BRIDGE,
+        SD_LLDP_DESTINATION_TYPE_NEAREST_CUSTOMER_BRIDGE,
+};
+
 typedef struct sd_lldp sd_lldp;
 typedef struct tlv_packet sd_lldp_packet;
 
@@ -56,4 +62,6 @@ int sd_lldp_packet_read_port_description(sd_lldp_packet *tlv, char **data, uint1
 sd_lldp_packet *sd_lldp_packet_ref(sd_lldp_packet *tlv);
 sd_lldp_packet *sd_lldp_packet_unref(sd_lldp_packet *tlv);
 
+int sd_lldp_packet_get_destination_type(sd_lldp_packet *tlv, int *dest);
+
 int sd_lldp_get_packets(sd_lldp *lldp, sd_lldp_packet ***tlvs);