Function if_clone_destroyif

freebsd/net/if_clone.c:303–349

* Destroy a clone network interface. */

 * Destroy a clone network interface.
 */
int
if_clone_destroyif(struct if_clone *ifc, struct ifnet *ifp)
{
	int err;
	struct ifnet *ifcifp;

	if (ifc->ifc_type == ADVANCED && ifc->ifc_destroy == NULL)
		return(EOPNOTSUPP);

	/*
	 * Given that the cloned ifnet might be attached to a different
	 * vnet from where its cloner was registered, we have to
	 * switch to the vnet context of the target vnet.
	 */
	CURVNET_SET_QUIET(ifp->if_vnet);

	IF_CLONE_LOCK(ifc);
	LIST_FOREACH(ifcifp, &ifc->ifc_iflist, if_clones) {
		if (ifcifp == ifp) {
			IFC_IFLIST_REMOVE(ifc, ifp);
			break;
		}
	}
	IF_CLONE_UNLOCK(ifc);
	if (ifcifp == NULL) {
		CURVNET_RESTORE();
		return (ENXIO);		/* ifp is not on the list. */
	}
	if ((ifc->ifc_flags & IFC_NOGROUP) == 0)
		if_delgroup(ifp, ifc->ifc_name);

	if (ifc->ifc_type == SIMPLE)
		err = ifc_simple_destroy(ifc, ifp);
	else
		err = (*ifc->ifc_destroy)(ifc, ifp);

	if (err != 0) {
		if ((ifc->ifc_flags & IFC_NOGROUP) == 0)
			if_addgroup(ifp, ifc->ifc_name);

		IF_CLONE_LOCK(ifc);
		IFC_IFLIST_INSERT(ifc, ifp);
		IF_CLONE_UNLOCK(ifc);
	}
	CURVNET_RESTORE();
	return (err);
}

static struct if_clone *
if_clone_alloc(const char *name, int maxunit)