Function bridge_ioctl

freebsd/net/if_bridge.c:789–930

* bridge_ioctl: * * Handle a control request from the operator. */

 *	Handle a control request from the operator.
 */
static int
bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
	struct bridge_softc *sc = ifp->if_softc;
	struct ifreq *ifr = (struct ifreq *)data;
	struct bridge_iflist *bif;
	struct thread *td = curthread;
	union {
		struct ifbreq ifbreq;
		struct ifbifconf ifbifconf;
		struct ifbareq ifbareq;
		struct ifbaconf ifbaconf;
		struct ifbrparam ifbrparam;
		struct ifbropreq ifbropreq;
	} args;
	struct ifdrv *ifd = (struct ifdrv *) data;
	const struct bridge_control *bc;
	int error = 0, oldmtu;

	BRIDGE_LOCK(sc);

	switch (cmd) {
	case SIOCADDMULTI:
	case SIOCDELMULTI:
		break;

	case SIOCGDRVSPEC:
	case SIOCSDRVSPEC:
		if (ifd->ifd_cmd >= bridge_control_table_size) {
			error = EINVAL;
			break;
		}
		bc = &bridge_control_table[ifd->ifd_cmd];

		if (cmd == SIOCGDRVSPEC &&
		    (bc->bc_flags & BC_F_COPYOUT) == 0) {
			error = EINVAL;
			break;
		}
		else if (cmd == SIOCSDRVSPEC &&
		    (bc->bc_flags & BC_F_COPYOUT) != 0) {
			error = EINVAL;
			break;
		}

		if (bc->bc_flags & BC_F_SUSER) {
			error = priv_check(td, PRIV_NET_BRIDGE);
			if (error)
				break;
		}

		if (ifd->ifd_len != bc->bc_argsize ||
		    ifd->ifd_len > sizeof(args)) {
			error = EINVAL;
			break;
		}

		bzero(&args, sizeof(args));