sd-netlink: always append new bridge FDB entries

This partially reverts 192a9d95ea3e058afd824d38a9cea16ad0a84a57 (#19432).

Fixes #20305.

(cherry picked from commit 74c1ab841fbad9d4f237c819577fcd1d46a072b6)
(cherry picked from commit 38388b95d71b7701922f90854ce568f74e11ed12)
(cherry picked from commit 2e27dd58a85c3e8bd9d0e7ff200a2e07f422743df)

diff --git a/src/libsystemd/sd-netlink/rtnl-message.c b/src/libsystemd/sd-netlink/rtnl-message.c
index c9d0c9b1e77ce9842cd9417a0fa36943d3c43915..f62b31889ebfc36b9a88d6c39986e83b75c20015 100644 (file)
--- a/src/libsystemd/sd-netlink/rtnl-message.c
+++ b/src/libsystemd/sd-netlink/rtnl-message.c
@@ -444,8 +444,12 @@ int sd_rtnl_message_new_neigh(sd_netlink *rtnl, sd_netlink_message **ret, uint16
         if (r < 0)
                 return r;
 
-        if (nlmsg_type == RTM_NEWNEIGH)
-                (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_REPLACE;
+        if (nlmsg_type == RTM_NEWNEIGH) {
+                if (ndm_family == AF_BRIDGE)
+                        (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_APPEND;
+                else
+                        (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_REPLACE;
+        }
 
         ndm = NLMSG_DATA((*ret)->hdr);