Function ether_ioctl

freebsd/net/if_ethersubr.c:1138–1201

}

int
ether_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
{
	struct ifaddr *ifa = (struct ifaddr *) data;
	struct ifreq *ifr = (struct ifreq *) data;
	int error = 0;

	switch (command) {
	case SIOCSIFADDR:
		ifp->if_flags |= IFF_UP;

		switch (ifa->ifa_addr->sa_family) {
#ifdef INET
		case AF_INET:
			ifp->if_init(ifp->if_softc);	/* before arpwhohas */
			arp_ifinit(ifp, ifa);
			break;
#endif
		default:
			ifp->if_init(ifp->if_softc);
			break;
		}
		break;

	case SIOCGIFADDR:
		bcopy(IF_LLADDR(ifp), &ifr->ifr_addr.sa_data[0],
		    ETHER_ADDR_LEN);
		break;

	case SIOCSIFMTU:
		/*
		 * Set the interface MTU.
		 */
		if (ifr->ifr_mtu > ETHERMTU) {
			error = EINVAL;
		} else {
			ifp->if_mtu = ifr->ifr_mtu;
		}
		break;

	case SIOCSLANPCP:
		error = priv_check(curthread, PRIV_NET_SETLANPCP);
		if (error != 0)
			break;
		if (ifr->ifr_lan_pcp > 7 &&
		    ifr->ifr_lan_pcp != IFNET_PCP_NONE) {
			error = EINVAL;
		} else {
			ifp->if_pcp = ifr->ifr_lan_pcp;
			/* broadcast event about PCP change */
			EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_PCP);
		}
		break;

	case SIOCGLANPCP:
		ifr->ifr_lan_pcp = ifp->if_pcp;
		break;