Function in_aifaddr_ioctl

freebsd/netinet/in.c:341–549

}

static int
in_aifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td)
{
	const struct in_aliasreq *ifra = (struct in_aliasreq *)data;
	const struct sockaddr_in *addr = &ifra->ifra_addr;
	const struct sockaddr_in *broadaddr = &ifra->ifra_broadaddr;
	const struct sockaddr_in *mask = &ifra->ifra_mask;
	const struct sockaddr_in *dstaddr = &ifra->ifra_dstaddr;
	const int vhid = (cmd == SIOCAIFADDR) ? ifra->ifra_vhid : 0;
	struct epoch_tracker et;
	struct ifaddr *ifa;
	struct in_ifaddr *ia;
	bool iaIsFirst;
	int error = 0;

	error = priv_check(td, PRIV_NET_ADDIFADDR);
	if (error)
		return (error);

	/*
	 * ifra_addr must be present and be of INET family.
	 * ifra_broadaddr/ifra_dstaddr and ifra_mask are optional.
	 */
	if (addr->sin_len != sizeof(struct sockaddr_in) ||
	    addr->sin_family != AF_INET)
		return (EINVAL);
	if (broadaddr->sin_len != 0 &&
	    (broadaddr->sin_len != sizeof(struct sockaddr_in) ||
	    broadaddr->sin_family != AF_INET))
		return (EINVAL);
	if (mask->sin_len != 0 &&
	    (mask->sin_len != sizeof(struct sockaddr_in) ||
	    mask->sin_family != AF_INET))
		return (EINVAL);
	if ((ifp->if_flags & IFF_POINTOPOINT) &&
	    (dstaddr->sin_len != sizeof(struct sockaddr_in) ||
	     dstaddr->sin_addr.s_addr == INADDR_ANY))
		return (EDESTADDRREQ);
	if (vhid > 0 && carp_attach_p == NULL)
		return (EPROTONOSUPPORT);

	/*
	 * See whether address already exist.
	 */
	iaIsFirst = true;
	ia = NULL;
	NET_EPOCH_ENTER(et);
	CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
		struct in_ifaddr *it;

		if (ifa->ifa_addr->sa_family != AF_INET)
			continue;

		it = (struct in_ifaddr *)ifa;
		if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
		    prison_check_ip4(td->td_ucred, &addr->sin_addr) == 0)
			ia = it;
		else