Declare a new EVENTHANDLER called iflladdr_event which signals that the L2

address on an interface has changed. This lets stacked interfaces such as
vlan(4) detect that their lower interface has changed and adjust things in
order to keep working. Previously this situation broke at least vlan(4) and
lagg(4) configurations.

The EVENTHANDLER_INVOKE call was not placed within if_setlladdr() due to the
risk of a loop.

PR:		kern/142927
Submitted by:	Nikolay Denev

3 files changed, 3 insertions, 0 deletions

diff --git a/sys/netgraph/ng_eiface.c b/sys/netgraph/ng_eiface.c
index 5c91b81..72cc55c 100644
--- a/sys/netgraph/ng_eiface.c
+++ b/sys/netgraph/ng_eiface.c
@@ -431,6 +431,7 @@ ng_eiface_rcvmsg(node_p node, item_p item, hook_p lasthook)
 			}
 			error = if_setlladdr(priv->ifp,
 			    (u_char *)msg->data, ETHER_ADDR_LEN);
+			EVENTHANDLER_INVOKE(iflladdr_event, priv->ifp);
 			break;
 		    }
 
diff --git a/sys/netgraph/ng_ether.c b/sys/netgraph/ng_ether.c
index dc38d41..5abc5aa 100644
--- a/sys/netgraph/ng_ether.c
+++ b/sys/netgraph/ng_ether.c
@@ -481,6 +481,7 @@ ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook)
 			}
 			error = if_setlladdr(priv->ifp,
 			    (u_char *)msg->data, ETHER_ADDR_LEN);
+			EVENTHANDLER_INVOKE(iflladdr_event, priv->ifp);
 			break;
 		    }
 		case NGM_ETHER_GET_PROMISC:
diff --git a/sys/netgraph/ng_fec.c b/sys/netgraph/ng_fec.c
index c1760d1..919947a 100644
--- a/sys/netgraph/ng_fec.c
+++ b/sys/netgraph/ng_fec.c
@@ -433,6 +433,7 @@ ng_fec_addport(struct ng_fec_private *priv, char *iface)
 
 	/* Set up phony MAC address. */
 	if_setlladdr(bifp, IF_LLADDR(ifp), ETHER_ADDR_LEN);
+	EVENTHANDLER_INVOKE(iflladdr_event, bifp);
 
 	/* Save original input vector */
 	new->fec_if_input = bifp->if_input;