networkd: add multicast membership to lldp socket (#5282)

1 files changed, 21 insertions, 0 deletions

diff --git a/src/libsystemd-network/lldp-network.c b/src/libsystemd-network/lldp-network.c
index 59c25598e9..ae2f6744d5 100644
--- a/src/libsystemd-network/lldp-network.c
+++ b/src/libsystemd-network/lldp-network.c
@@ -47,6 +47,13 @@ int lldp_network_bind_raw_socket(int ifindex) {
                 .filter = (struct sock_filter*) filter,
         };
 
+        struct packet_mreq mreq = {
+                .mr_ifindex = ifindex,
+                .mr_type = PACKET_MR_MULTICAST,
+                .mr_alen = ETH_ALEN,
+                .mr_address = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x00 }
+        };
+
         union sockaddr_union saddrll = {
                 .ll.sll_family = AF_PACKET,
                 .ll.sll_ifindex = ifindex,
@@ -66,6 +73,20 @@ int lldp_network_bind_raw_socket(int ifindex) {
         if (r < 0)
                 return -errno;
 
+        r = setsockopt(fd, SOL_PACKET, PACKET_ADD_MEMBERSHIP, &mreq, sizeof(mreq));
+        if (r < 0)
+                return -errno;
+
+        mreq.mr_address[ETH_ALEN - 1] = 0x03;
+        r = setsockopt(fd, SOL_PACKET, PACKET_ADD_MEMBERSHIP, &mreq, sizeof(mreq));
+        if (r < 0)
+                return -errno;
+
+        mreq.mr_address[ETH_ALEN - 1] = 0x0E;
+        r = setsockopt(fd, SOL_PACKET, PACKET_ADD_MEMBERSHIP, &mreq, sizeof(mreq));
+        if (r < 0)
+                return -errno;
+
         r = bind(fd, &saddrll.sa, sizeof(saddrll.ll));
         if (r < 0)
                 return -errno;