Function if_free

freebsd/net/if.c:714–731

* Deregister an interface and free the associated storage. */

 * Deregister an interface and free the associated storage.
 */
void
if_free(struct ifnet *ifp)
{

	ifp->if_flags |= IFF_DYING;			/* XXX: Locking */

	CURVNET_SET_QUIET(ifp->if_vnet);
	IFNET_WLOCK();
	KASSERT(ifp == ifnet_byindex(ifp->if_index),
	    ("%s: freeing unallocated ifnet", ifp->if_xname));

	ifindex_free_locked(ifp->if_index);
	IFNET_WUNLOCK();

	if (refcount_release(&ifp->if_refcount))
		NET_EPOCH_CALL(if_destroy, &ifp->if_epoch_ctx);
	CURVNET_RESTORE();
}

/*
 * Interfaces to keep an ifnet type-stable despite the possibility of the