Function if_attach_internal

freebsd/net/if.c:857–994

}

static void
if_attach_internal(struct ifnet *ifp, int vmove, struct if_clone *ifc)
{
	unsigned socksize, ifasize;
	int namelen, masklen;
	struct sockaddr_dl *sdl;
	struct ifaddr *ifa;

	if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index))
		panic ("%s: BUG: if_attach called without if_alloc'd input()\n",
		    ifp->if_xname);

#ifdef VIMAGE
	ifp->if_vnet = curvnet;
	if (ifp->if_home_vnet == NULL)
		ifp->if_home_vnet = curvnet;
#endif

	if_addgroup(ifp, IFG_ALL);

	/* Restore group membership for cloned interfaces. */
	if (vmove && ifc != NULL)
		if_clone_addgroup(ifp, ifc);

	getmicrotime(&ifp->if_lastchange);
	ifp->if_epoch = time_uptime;

	KASSERT((ifp->if_transmit == NULL && ifp->if_qflush == NULL) ||
	    (ifp->if_transmit != NULL && ifp->if_qflush != NULL),
	    ("transmit and qflush must both either be set or both be NULL"));
	if (ifp->if_transmit == NULL) {
		ifp->if_transmit = if_transmit;
		ifp->if_qflush = if_qflush;
	}
	if (ifp->if_input == NULL)
		ifp->if_input = if_input_default;

	if (ifp->if_requestencap == NULL)
		ifp->if_requestencap = if_requestencap_default;

	if (!vmove) {
#ifdef MAC
		mac_ifnet_create(ifp);
#endif

		/*
		 * Create a Link Level name for this device.
		 */
		namelen = strlen(ifp->if_xname);
		/*
		 * Always save enough space for any possiable name so we
		 * can do a rename in place later.
		 */
		masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ;
		socksize = masklen + ifp->if_addrlen;
		if (socksize < sizeof(*sdl))
			socksize = sizeof(*sdl);
		socksize = roundup2(socksize, sizeof(long));