When moving an ethernet ifnet from one vnet to another, destroy the

associated ng_ether netgraph node in the current vnet, and create a
new one in the target vnet.

Reviewed by:	julian
MFC after:	3 days

2 files changed, 34 insertions, 0 deletions

diff --git a/sys/net/if.c b/sys/net/if.c
index c1c6ee9..c387dbf 100644
--- a/sys/net/if.c
+++ b/sys/net/if.c
@@ -956,12 +956,21 @@ if_vmove(struct ifnet *ifp, struct vnet *new_vnet)
 	 */
 	IFNET_WLOCK();
 	ifindex_free_locked(ifp->if_index);
+	IFNET_WUNLOCK();
+
+	/*
+	 * Perform interface-specific reassignment tasks, if provided by
+	 * the driver.
+	 */
+	if (ifp->if_reassign != NULL)
+		ifp->if_reassign(ifp, new_vnet, NULL);
 
 	/*
 	 * Switch to the context of the target vnet.
 	 */
 	CURVNET_SET_QUIET(new_vnet);
 
+	IFNET_WLOCK();
 	if (ifindex_alloc_locked(&idx) != 0) {
 		IFNET_WUNLOCK();
 		panic("if_index overflow");
diff --git a/sys/net/if_ethersubr.c b/sys/net/if_ethersubr.c
index d284d11..5e5a548 100644
--- a/sys/net/if_ethersubr.c
+++ b/sys/net/if_ethersubr.c
@@ -129,6 +129,9 @@ static const u_char etherbroadcastaddr[ETHER_ADDR_LEN] =
 
 static	int ether_resolvemulti(struct ifnet *, struct sockaddr **,
 		struct sockaddr *);
+#ifdef VIMAGE
+static	void ether_reassign(struct ifnet *, struct vnet *, char *);
+#endif
 
 /* XXX: should be in an arp support file, not here */
 MALLOC_DEFINE(M_ARPCOM, "arpcom", "802.* interface internals");
@@ -944,6 +947,9 @@ ether_ifattach(struct ifnet *ifp, const u_int8_t *lla)
 	ifp->if_output = ether_output;
 	ifp->if_input = ether_input;
 	ifp->if_resolvemulti = ether_resolvemulti;
+#ifdef VIMAGE
+	ifp->if_reassign = ether_reassign;
+#endif
 	if (ifp->if_baudrate == 0)
 		ifp->if_baudrate = IF_Mbps(10);		/* just a default */
 	ifp->if_broadcastaddr = etherbroadcastaddr;
@@ -983,6 +989,25 @@ ether_ifdetach(struct ifnet *ifp)
 	if_detach(ifp);
 }
 
+#ifdef VIMAGE
+void
+ether_reassign(struct ifnet *ifp, struct vnet *new_vnet, char *unused __unused)
+{
+
+	if (IFP2AC(ifp)->ac_netgraph != NULL) {
+		KASSERT(ng_ether_detach_p != NULL,
+		    ("ng_ether_detach_p is NULL"));
+		(*ng_ether_detach_p)(ifp);
+	}
+
+	if (ng_ether_attach_p != NULL) {
+		CURVNET_SET_QUIET(new_vnet);
+		(*ng_ether_attach_p)(ifp);
+		CURVNET_RESTORE();
+	}
+}
+#endif
+
 SYSCTL_DECL(_net_link);
 SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet");
 #if defined(INET) || defined(INET6)