networkd: add basic LLDP transmission support

Let's add some minimalistic LLDP sender support. The idea is that this is
either on or off, and all fields determined automatically rather than
configured explicitly.

1 files changed, 27 insertions, 2 deletions

diff --git a/src/network/networkd-link.c b/src/network/networkd-link.c
index 2bc6e3c842..86fa4f07f2 100644
--- a/src/network/networkd-link.c
+++ b/src/network/networkd-link.c
@@ -30,6 +30,7 @@
 #include "netlink-util.h"
 #include "network-internal.h"
 #include "networkd-link.h"
+#include "networkd-lldp-tx.h"
 #include "networkd-netdev.h"
 #include "set.h"
 #include "socket-util.h"
@@ -99,7 +100,7 @@ static bool link_ipv6ll_enabled(Link *link) {
         return link->network->link_local & ADDRESS_FAMILY_IPV6;
 }
 
-static bool link_lldp_enabled(Link *link) {
+static bool link_lldp_rx_enabled(Link *link) {
         assert(link);
 
         if (link->flags & IFF_LOOPBACK)
@@ -117,6 +118,21 @@ static bool link_lldp_enabled(Link *link) {
         return link->network->lldp_mode != LLDP_MODE_NO;
 }
 
+static bool link_lldp_tx_enabled(Link *link) {
+        assert(link);
+
+        if (link->flags & IFF_LOOPBACK)
+                return false;
+
+        if (link->iftype != ARPHRD_ETHER)
+                return false;
+
+        if (!link->network)
+                return false;
+
+        return link->network->lldp_emit;
+}
+
 static bool link_ipv4_forward_enabled(Link *link) {
         assert(link);
 
@@ -419,6 +435,8 @@ static void link_free(Link *link) {
         sd_dhcp_client_unref(link->dhcp_client);
         sd_dhcp_lease_unref(link->dhcp_lease);
 
+        link_lldp_tx_stop(link);
+
         free(link->lease_file);
 
         sd_lldp_unref(link->lldp);
@@ -546,6 +564,7 @@ static int link_stop_clients(Link *link) {
                         r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
         }
 
+        link_lldp_tx_stop(link);
         return r;
 }
 
@@ -1383,6 +1402,12 @@ static int link_acquire_conf(Link *link) {
                         return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
         }
 
+        if (link_lldp_tx_enabled(link)) {
+                r = link_lldp_tx_start(link);
+                if (r < 0)
+                        return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
+        }
+
         return 0;
 }
 
@@ -2191,7 +2216,7 @@ static int link_configure(Link *link) {
                         return r;
         }
 
-        if (link_lldp_enabled(link)) {
+        if (link_lldp_rx_enabled(link)) {
                 r = sd_lldp_new(&link->lldp, link->ifindex);
                 if (r < 0)
                         return r;