networkd: reworkd LLDP emission to allow control of propagation level

This allows selecting the propagation level of emitted LLDP packets
(specifically: the destination MAC address of the packets). This is useful
because it allows generating LLDP packets that optionally cross certain types
of bridges.

See 802.11ab-2009, Table 7-1 for details.

1 files changed, 12 insertions, 2 deletions

diff --git a/src/network/networkd-lldp-tx.h b/src/network/networkd-lldp-tx.h
index 8c7f403005..4680c9d950 100644
--- a/src/network/networkd-lldp-tx.h
+++ b/src/network/networkd-lldp-tx.h
@@ -21,5 +21,15 @@
 
 #include "networkd-link.h"
 
-int link_lldp_tx_start(Link *link);
-void link_lldp_tx_stop(Link *link);
+typedef enum LLDPEmit {
+        LLDP_EMIT_NO,
+        LLDP_EMIT_NEAREST_BRIDGE,
+        LLDP_EMIT_NON_TPMR_BRIDGE,
+        LLDP_EMIT_CUSTOMER_BRIDGE,
+        _LLDP_EMIT_MAX,
+} LLDPEmit;
+
+int link_lldp_emit_start(Link *link);
+void link_lldp_emit_stop(Link *link);
+
+int config_parse_lldp_emit(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);