Change vlan interfaces to cope more usefully with the parent interface being

renamed.  Previously the vlan interfaces would lose their configuration as if
the parent interface had been physically removed.  Now vlan interfaces ignore
rename events.
- Add a new ifnet flag (IFF_RENAMING) that is set while an ifnet is being
  renamed.  This flag can be checked in ifnet departure/arrival event
  handlers to treat rename events differently.
- Change the ifnet departure event handler in the if_vlan(4) driver to
  ignore departure events due to a trunk interface being renamed.

Reviewed by:	brooks, rwatson
MFC after:	1 week
This commit is contained in:
jhb 2009-12-29 13:35:18 +00:00
parent aa28c32138
commit 3ce93dcb7c
3 changed files with 17 additions and 1 deletions

View File

@ -2095,6 +2095,14 @@ ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td)
return (EINVAL);
if (ifunit(new_name) != NULL)
return (EEXIST);
/*
* XXX: Locking. Nothing else seems to lock if_flags,
* and there are numerous other races with the
* ifunit() checks not being atomic with namespace
* changes (renames, vmoves, if_attach, etc).
*/
ifp->if_flags |= IFF_RENAMING;
/* Announce the departure of the interface. */
rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
@ -2129,6 +2137,8 @@ ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td)
EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp);
/* Announce the return of the interface. */
rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
ifp->if_flags &= ~IFF_RENAMING;
break;
#ifdef VIMAGE

View File

@ -150,6 +150,7 @@ struct if_data {
#define IFF_MONITOR 0x40000 /* (n) user-requested monitor mode */
#define IFF_STATICARP 0x80000 /* (n) static ARP */
#define IFF_DYING 0x200000 /* (n) interface is winding down */
#define IFF_RENAMING 0x400000 /* (n) interface is being renamed */
/*
* Old names for driver flags so that user space tools can continue to use

View File

@ -466,7 +466,8 @@ vlan_setmulti(struct ifnet *ifp)
* A handler for network interface departure events.
* Track departure of trunks here so that we don't access invalid
* pointers or whatever if a trunk is ripped from under us, e.g.,
* by ejecting its hot-plug card.
* by ejecting its hot-plug card. However, if an ifnet is simply
* being renamed, then there's no need to tear down the state.
*/
static void
vlan_ifdetach(void *arg __unused, struct ifnet *ifp)
@ -481,6 +482,10 @@ vlan_ifdetach(void *arg __unused, struct ifnet *ifp)
if (ifp->if_vlantrunk == NULL)
return;
/* If the ifnet is just being renamed, don't do anything. */
if (ifp->if_flags & IFF_RENAMING)
return;
VLAN_LOCK();
/*
* OK, it's a trunk. Loop over and detach all vlan's on it.