diff --git a/ap/app/clatd/ifc_utils.c b/ap/app/clatd/ifc_utils.c
new file mode 100755
index 0000000..02304e5
--- /dev/null
+++ b/ap/app/clatd/ifc_utils.c
@@ -0,0 +1,759 @@
+/*
+ * Copyright 2008, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <arpa/inet.h>
+#include <errno.h>
+#include <linux/if.h>
+#include <linux/if_ether.h>
+#include <linux/if_arp.h>
+#include <linux/netlink.h>
+#include <linux/route.h>
+#include <linux/ipv6_route.h>
+#include <linux/rtnetlink.h>
+#include <linux/sockios.h>
+//#include <net/if.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/select.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdarg.h>
+#include <sys/ioctl.h>
+
+#ifdef ANDROID
+#define LOG_TAG "NetUtils"
+#include <cutils/properties.h>
+#include <log/log.h>
+#else
+#define ALOGD printf
+#define ALOGW printf
+#endif
+
+#include "ifc.h"
+
+/* Deprecated. In Android O and above, there's no limit on property name length. */
+#define PROP_NAME_MAX   32
+
+/* System properties are *small* name value pairs managed by the
+** property service.  If your data doesn't fit in the provided
+** space it is not appropriate for a system property.
+**
+** WARNING: system/bionic/include/sys/system_properties.h also defines
+**          these, but with different names.  (TODO: fix that)
+*/
+#define PROPERTY_KEY_MAX   PROP_NAME_MAX
+#define PROPERTY_VALUE_MAX  PROP_VALUE_MAX
+
+int property_set(const char *key, const char *value) {
+    return 0;
+}
+
+void printerr(char *fmt, ...)
+{
+    va_list ap;
+    char tmp_buf[256] = {0};
+    va_start(ap, fmt);
+    vsnprintf(tmp_buf, sizeof(tmp_buf), fmt, ap);
+    va_end(ap);
+
+    printf("%s\n", tmp_buf);
+}
+
+#if defined(__ANDROID__)
+/* SIOCKILLADDR is an Android extension. */
+#define SIOCKILLADDR 0x8939
+#endif
+
+static int ifc_ctl_sock = -1;
+static int ifc_ctl_sock6 = -1;
+//static pthread_mutex_t ifc_sock_mutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
+//static pthread_mutex_t ifc_sock6_mutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
+static pthread_mutex_t ifc_sock_mutex = PTHREAD_MUTEX_INITIALIZER;
+static pthread_mutex_t ifc_sock6_mutex = PTHREAD_MUTEX_INITIALIZER;
+void printerr(char *fmt, ...);
+
+#define DBG 0
+#define INET_ADDRLEN 4
+#define INET6_ADDRLEN 16
+
+in_addr_t prefixLengthToIpv4Netmask(int prefix_length)
+{
+    in_addr_t mask = 0;
+
+    // C99 (6.5.7): shifts of 32 bits have undefined results
+    if (prefix_length <= 0 || prefix_length > 32) {
+        return 0;
+    }
+
+    mask = ~mask << (32 - prefix_length);
+    mask = htonl(mask);
+
+    return mask;
+}
+
+int ipv4NetmaskToPrefixLength(in_addr_t mask)
+{
+    int prefixLength = 0;
+    uint32_t m = (uint32_t)ntohl(mask);
+    while (m & 0x80000000) {
+        prefixLength++;
+        m = m << 1;
+    }
+    return prefixLength;
+}
+
+static const char *ipaddr_to_string(in_addr_t addr)
+{
+    struct in_addr in_addr;
+
+    in_addr.s_addr = addr;
+    return inet_ntoa(in_addr);
+}
+
+int string_to_ip(const char *string, struct sockaddr_storage *ss) {
+    struct addrinfo hints, *ai;
+    int ret;
+
+    if (ss == NULL) {
+        return -EFAULT;
+    }
+
+    memset(&hints, 0, sizeof(hints));
+    hints.ai_family = AF_UNSPEC;
+    hints.ai_flags = AI_NUMERICHOST;
+    hints.ai_socktype = SOCK_DGRAM;
+
+    ret = getaddrinfo(string, NULL, &hints, &ai);
+    if (ret == 0) {
+        memcpy(ss, ai->ai_addr, ai->ai_addrlen);
+        freeaddrinfo(ai);
+    }
+
+    return ret;
+}
+
+int ifc_init(void)
+{
+    int ret;
+
+    pthread_mutex_lock(&ifc_sock_mutex);
+    if (ifc_ctl_sock == -1) {
+        ifc_ctl_sock = socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0);
+        if (ifc_ctl_sock < 0) {
+            printerr("socket() failed: %s\n", strerror(errno));
+        }
+    }
+
+    ret = ifc_ctl_sock < 0 ? -1 : 0;
+    if (DBG) printerr("ifc_init_returning %d", ret);
+    return ret;
+}
+
+int ifc_init6(void)
+{
+    pthread_mutex_lock(&ifc_sock6_mutex);
+    if (ifc_ctl_sock6 == -1) {
+        ifc_ctl_sock6 = socket(AF_INET6, SOCK_DGRAM | SOCK_CLOEXEC, 0);
+        if (ifc_ctl_sock6 < 0) {
+            printerr("socket() failed: %s\n", strerror(errno));
+        }
+    }
+    return ifc_ctl_sock6 < 0 ? -1 : 0;
+}
+
+void ifc_close(void)
+{
+    if (DBG) printerr("ifc_close");
+    if (ifc_ctl_sock != -1) {
+        (void)close(ifc_ctl_sock);
+        ifc_ctl_sock = -1;
+    }
+    pthread_mutex_unlock(&ifc_sock_mutex);
+}
+
+void ifc_close6(void)
+{
+    if (ifc_ctl_sock6 != -1) {
+        (void)close(ifc_ctl_sock6);
+        ifc_ctl_sock6 = -1;
+    }
+    pthread_mutex_unlock(&ifc_sock6_mutex);
+}
+
+static void ifc_init_ifr(const char *name, struct ifreq *ifr)
+{
+    memset(ifr, 0, sizeof(struct ifreq));
+    strncpy(ifr->ifr_name, name, IFNAMSIZ);
+    ifr->ifr_name[IFNAMSIZ - 1] = 0;
+}
+
+int ifc_get_hwaddr(const char *name, void *ptr)
+{
+    int r;
+    struct ifreq ifr;
+    ifc_init_ifr(name, &ifr);
+
+    r = ioctl(ifc_ctl_sock, SIOCGIFHWADDR, &ifr);
+    if(r < 0) return -1;
+
+    memcpy(ptr, &ifr.ifr_hwaddr.sa_data, ETH_ALEN);
+    return 0;
+}
+
+int ifc_get_ifindex(const char *name, int *if_indexp)
+{
+    int r;
+    struct ifreq ifr;
+    ifc_init_ifr(name, &ifr);
+
+    r = ioctl(ifc_ctl_sock, SIOCGIFINDEX, &ifr);
+    if(r < 0) return -1;
+
+    *if_indexp = ifr.ifr_ifindex;
+    return 0;
+}
+
+static int ifc_set_flags(const char *name, unsigned set, unsigned clr)
+{
+    struct ifreq ifr;
+    ifc_init_ifr(name, &ifr);
+
+    if(ioctl(ifc_ctl_sock, SIOCGIFFLAGS, &ifr) < 0) return -1;
+    ifr.ifr_flags = (ifr.ifr_flags & (~clr)) | set;
+    return ioctl(ifc_ctl_sock, SIOCSIFFLAGS, &ifr);
+}
+
+int ifc_up(const char *name)
+{
+    int ret = ifc_set_flags(name, IFF_UP, 0);
+    if (DBG) printerr("ifc_up(%s) = %d", name, ret);
+    return ret;
+}
+
+int ifc_down(const char *name)
+{
+    int ret = ifc_set_flags(name, 0, IFF_UP);
+    if (DBG) printerr("ifc_down(%s) = %d", name, ret);
+    return ret;
+}
+
+static void init_sockaddr_in(struct sockaddr *sa, in_addr_t addr)
+{
+    struct sockaddr_in *sin = (struct sockaddr_in *) sa;
+    sin->sin_family = AF_INET;
+    sin->sin_port = 0;
+    sin->sin_addr.s_addr = addr;
+}
+
+int ifc_set_addr(const char *name, in_addr_t addr)
+{
+    struct ifreq ifr;
+    int ret;
+
+    ifc_init_ifr(name, &ifr);
+    init_sockaddr_in(&ifr.ifr_addr, addr);
+
+    ret = ioctl(ifc_ctl_sock, SIOCSIFADDR, &ifr);
+    if (DBG) printerr("ifc_set_addr(%s, xx) = %d", name, ret);
+    return ret;
+}
+
+/*
+ * Adds or deletes an IP address on an interface.
+ *
+ * Action is one of:
+ * - RTM_NEWADDR (to add a new address)
+ * - RTM_DELADDR (to delete an existing address)
+ *
+ * Returns zero on success and negative errno on failure.
+ */
+int ifc_act_on_address(int action, const char *name, const char *address,
+                       int prefixlen) {
+    int ifindex, s, len, ret;
+    struct sockaddr_storage ss;
+    int saved_errno;
+    void *addr;
+    size_t addrlen;
+    struct {
+        struct nlmsghdr n;
+        struct ifaddrmsg r;
+        // Allow for IPv6 address, headers, IPv4 broadcast addr and padding.
+        char attrbuf[NLMSG_ALIGN(sizeof(struct nlmsghdr)) +
+                     NLMSG_ALIGN(sizeof(struct rtattr)) +
+                     NLMSG_ALIGN(INET6_ADDRLEN) +
+                     NLMSG_ALIGN(sizeof(struct rtattr)) +
+                     NLMSG_ALIGN(INET_ADDRLEN)];
+    } req;
+    struct rtattr *rta;
+    struct nlmsghdr *nh;
+    struct nlmsgerr *err;
+    char buf[NLMSG_ALIGN(sizeof(struct nlmsghdr)) +
+             NLMSG_ALIGN(sizeof(struct nlmsgerr)) +
+             NLMSG_ALIGN(sizeof(struct nlmsghdr))];
+
+    // Get interface ID.
+    ifindex = if_nametoindex(name);
+    if (ifindex == 0) {
+        return -errno;
+    }
+
+    // Convert string representation to sockaddr_storage.
+    ret = string_to_ip(address, &ss);
+    if (ret) {
+        return ret;
+    }
+
+    // Determine address type and length.
+    if (ss.ss_family == AF_INET) {
+        struct sockaddr_in *sin = (struct sockaddr_in *) &ss;
+        addr = &sin->sin_addr;
+        addrlen = INET_ADDRLEN;
+    } else if (ss.ss_family == AF_INET6) {
+        struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) &ss;
+        addr = &sin6->sin6_addr;
+        addrlen = INET6_ADDRLEN;
+    } else {
+        return -EAFNOSUPPORT;
+    }
+
+    // Fill in netlink structures.
+    memset(&req, 0, sizeof(req));
+
+    // Netlink message header.
+    req.n.nlmsg_len = NLMSG_LENGTH(sizeof(req.r));
+    req.n.nlmsg_type = action;
+    req.n.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
+    req.n.nlmsg_pid = getpid();
+
+    // Interface address message header.
+    req.r.ifa_family = ss.ss_family;
+    req.r.ifa_prefixlen = prefixlen;
+    req.r.ifa_index = ifindex;
+
+    // Routing attribute. Contains the actual IP address.
+    rta = (struct rtattr *) (((char *) &req) + NLMSG_ALIGN(req.n.nlmsg_len));
+    rta->rta_type = IFA_LOCAL;
+    rta->rta_len = RTA_LENGTH(addrlen);
+    req.n.nlmsg_len = NLMSG_ALIGN(req.n.nlmsg_len) + RTA_LENGTH(addrlen);
+    memcpy(RTA_DATA(rta), addr, addrlen);
+
+    // Add an explicit IFA_BROADCAST for IPv4 RTM_NEWADDRs.
+    if (ss.ss_family == AF_INET && action == RTM_NEWADDR) {
+        rta = (struct rtattr *) (((char *) &req) + NLMSG_ALIGN(req.n.nlmsg_len));
+        rta->rta_type = IFA_BROADCAST;
+        rta->rta_len = RTA_LENGTH(addrlen);
+        req.n.nlmsg_len = NLMSG_ALIGN(req.n.nlmsg_len) + RTA_LENGTH(addrlen);
+        ((struct in_addr *)addr)->s_addr |= htonl((1<<(32-prefixlen))-1);
+        memcpy(RTA_DATA(rta), addr, addrlen);
+    }
+
+    s = socket(PF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, NETLINK_ROUTE);
+    if (s < 0) {
+        return -errno;
+    }
+
+    if (send(s, &req, req.n.nlmsg_len, 0) < 0) {
+        saved_errno = errno;
+        close(s);
+        return -saved_errno;
+    }
+
+    len = recv(s, buf, sizeof(buf), 0);
+    saved_errno = errno;
+    close(s);
+    if (len < 0) {
+        return -saved_errno;
+    }
+
+    // Parse the acknowledgement to find the return code.
+    nh = (struct nlmsghdr *) buf;
+    if (!NLMSG_OK(nh, (unsigned) len) || nh->nlmsg_type != NLMSG_ERROR) {
+        return -EINVAL;
+    }
+    err = NLMSG_DATA(nh);
+
+    // Return code is negative errno.
+    return err->error;
+}
+
+int ifc_add_address(const char *name, const char *address, int prefixlen) {
+    return ifc_act_on_address(RTM_NEWADDR, name, address, prefixlen);
+}
+
+int ifc_del_address(const char *name, const char * address, int prefixlen) {
+    return ifc_act_on_address(RTM_DELADDR, name, address, prefixlen);
+}
+
+/*
+ * Clears IPv6 addresses on the specified interface.
+ */
+int ifc_clear_ipv6_addresses(const char *name) {
+    char rawaddrstr[INET6_ADDRSTRLEN], addrstr[INET6_ADDRSTRLEN];
+    unsigned int prefixlen;
+    int lasterror = 0, i, j, ret;
+    char ifname[64];  // Currently, IFNAMSIZ = 16.
+    FILE *f = fopen("/proc/net/if_inet6", "r");
+    if (!f) {
+        return -errno;
+    }
+
+    // Format:
+    // 20010db8000a0001fc446aa4b5b347ed 03 40 00 01    wlan0
+    while (fscanf(f, "%32s %*02x %02x %*02x %*02x %63s\n",
+                  rawaddrstr, &prefixlen, ifname) == 3) {
+        // Is this the interface we're looking for?
+        if (strcmp(name, ifname)) {
+            continue;
+        }
+
+        // Put the colons back into the address.
+        for (i = 0, j = 0; i < 32; i++, j++) {
+            addrstr[j] = rawaddrstr[i];
+            if (i % 4 == 3) {
+                addrstr[++j] = ':';
+            }
+        }
+        addrstr[j - 1] = '\0';
+
+        // Don't delete the link-local address as well, or it will disable IPv6
+        // on the interface.
+        if (strncmp(addrstr, "fe80:", 5) == 0) {
+            continue;
+        }
+
+        ret = ifc_del_address(ifname, addrstr, prefixlen);
+        if (ret) {
+            printf("Deleting address %s/%d on %s: %s", addrstr, prefixlen, ifname,
+                 strerror(-ret));
+            lasterror = ret;
+        }
+    }
+
+    fclose(f);
+    return lasterror;
+}
+
+/*
+ * Clears IPv4 addresses on the specified interface.
+ */
+void ifc_clear_ipv4_addresses(const char *name) {
+    unsigned count, addr;
+    ifc_init();
+    for (count=0, addr=1;((addr != 0) && (count < 255)); count++) {
+        if (ifc_get_addr(name, &addr) < 0)
+            break;
+        if (addr)
+            ifc_set_addr(name, 0);
+    }
+    ifc_close();
+}
+
+/*
+ * Clears all IP addresses on the specified interface.
+ */
+int ifc_clear_addresses(const char *name) {
+    ifc_clear_ipv4_addresses(name);
+    return ifc_clear_ipv6_addresses(name);
+}
+
+int ifc_set_hwaddr(const char *name, const void *ptr)
+{
+    struct ifreq ifr;
+    ifc_init_ifr(name, &ifr);
+
+    ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
+    memcpy(&ifr.ifr_hwaddr.sa_data, ptr, ETH_ALEN);
+    return ioctl(ifc_ctl_sock, SIOCSIFHWADDR, &ifr);
+}
+
+int ifc_set_mask(const char *name, in_addr_t mask)
+{
+    struct ifreq ifr;
+    int ret;
+
+    ifc_init_ifr(name, &ifr);
+    init_sockaddr_in(&ifr.ifr_addr, mask);
+
+    ret = ioctl(ifc_ctl_sock, SIOCSIFNETMASK, &ifr);
+    if (DBG) printerr("ifc_set_mask(%s, xx) = %d", name, ret);
+    return ret;
+}
+
+int ifc_set_prefixLength(const char *name, int prefixLength)
+{
+    struct ifreq ifr;
+    // TODO - support ipv6
+    if (prefixLength > 32 || prefixLength < 0) return -1;
+
+    in_addr_t mask = prefixLengthToIpv4Netmask(prefixLength);
+    ifc_init_ifr(name, &ifr);
+    init_sockaddr_in(&ifr.ifr_addr, mask);
+
+    return ioctl(ifc_ctl_sock, SIOCSIFNETMASK, &ifr);
+}
+
+int ifc_get_addr(const char *name, in_addr_t *addr)
+{
+    struct ifreq ifr;
+    int ret = 0;
+
+    ifc_init_ifr(name, &ifr);
+    if (addr != NULL) {
+        ret = ioctl(ifc_ctl_sock, SIOCGIFADDR, &ifr);
+        if (ret < 0) {
+            *addr = 0;
+        } else {
+            *addr = ((struct sockaddr_in*) &ifr.ifr_addr)->sin_addr.s_addr;
+        }
+    }
+    return ret;
+}
+
+int ifc_get_info(const char *name, in_addr_t *addr, int *prefixLength, unsigned *flags)
+{
+    struct ifreq ifr;
+    ifc_init_ifr(name, &ifr);
+
+    if (addr != NULL) {
+        if(ioctl(ifc_ctl_sock, SIOCGIFADDR, &ifr) < 0) {
+            *addr = 0;
+        } else {
+            *addr = ((struct sockaddr_in*) &ifr.ifr_addr)->sin_addr.s_addr;
+        }
+    }
+
+    if (prefixLength != NULL) {
+        if(ioctl(ifc_ctl_sock, SIOCGIFNETMASK, &ifr) < 0) {
+            *prefixLength = 0;
+        } else {
+            *prefixLength = ipv4NetmaskToPrefixLength(
+                    ((struct sockaddr_in*) &ifr.ifr_addr)->sin_addr.s_addr);
+        }
+    }
+
+    if (flags != NULL) {
+        if(ioctl(ifc_ctl_sock, SIOCGIFFLAGS, &ifr) < 0) {
+            *flags = 0;
+        } else {
+            *flags = ifr.ifr_flags;
+        }
+    }
+
+    return 0;
+}
+
+int ifc_act_on_ipv4_route(int action, const char *ifname, struct in_addr dst, int prefix_length,
+      struct in_addr gw)
+{
+    struct rtentry rt;
+    int result;
+    in_addr_t netmask;
+
+    memset(&rt, 0, sizeof(rt));
+
+    rt.rt_dst.sa_family = AF_INET;
+    rt.rt_dev = (void*) ifname;
+
+    netmask = prefixLengthToIpv4Netmask(prefix_length);
+    init_sockaddr_in(&rt.rt_genmask, netmask);
+    init_sockaddr_in(&rt.rt_dst, dst.s_addr);
+    rt.rt_flags = RTF_UP;
+
+    if (prefix_length == 32) {
+        rt.rt_flags |= RTF_HOST;
+    }
+
+    if (gw.s_addr != 0) {
+        rt.rt_flags |= RTF_GATEWAY;
+        init_sockaddr_in(&rt.rt_gateway, gw.s_addr);
+    }
+
+    ifc_init();
+
+    if (ifc_ctl_sock < 0) {
+        ifc_close();
+        return -errno;
+    }
+
+    result = ioctl(ifc_ctl_sock, action, &rt);
+    if (result < 0) {
+        if (errno == EEXIST) {
+            result = 0;
+        } else {
+            result = -errno;
+        }
+    }
+    ifc_close();
+    return result;
+}
+
+/* deprecated - v4 only */
+int ifc_create_default_route(const char *name, in_addr_t gw)
+{
+    struct in_addr in_dst, in_gw;
+
+    in_dst.s_addr = 0;
+    in_gw.s_addr = gw;
+
+    int ret = ifc_act_on_ipv4_route(SIOCADDRT, name, in_dst, 0, in_gw);
+    if (DBG) printerr("ifc_create_default_route(%s, %d) = %d", name, gw, ret);
+    return ret;
+}
+
+// Needed by code in hidden partner repositories / branches, so don't delete.
+int ifc_enable(const char *ifname)
+{
+    int result;
+
+    ifc_init();
+    result = ifc_up(ifname);
+    ifc_close();
+    return result;
+}
+
+// Needed by code in hidden partner repositories / branches, so don't delete.
+int ifc_disable(const char *ifname)
+{
+    unsigned addr, count;
+    int result;
+
+    ifc_init();
+    result = ifc_down(ifname);
+
+    ifc_set_addr(ifname, 0);
+    for (count=0, addr=1;((addr != 0) && (count < 255)); count++) {
+       if (ifc_get_addr(ifname, &addr) < 0)
+            break;
+       if (addr)
+          ifc_set_addr(ifname, 0);
+    }
+
+    ifc_close();
+    return result;
+}
+
+int ifc_reset_connections(const char *ifname, const int reset_mask)
+{
+#if defined(__ANDROID__)
+    int result, success;
+    in_addr_t myaddr = 0;
+    struct ifreq ifr;
+    struct in6_ifreq ifr6;
+
+    if (reset_mask & RESET_IPV4_ADDRESSES) {
+        /* IPv4. Clear connections on the IP address. */
+        ifc_init();
+        if (!(reset_mask & RESET_IGNORE_INTERFACE_ADDRESS)) {
+            ifc_get_info(ifname, &myaddr, NULL, NULL);
+        }
+        ifc_init_ifr(ifname, &ifr);
+        init_sockaddr_in(&ifr.ifr_addr, myaddr);
+        result = ioctl(ifc_ctl_sock, SIOCKILLADDR,  &ifr);
+        ifc_close();
+    } else {
+        result = 0;
+    }
+
+    if (reset_mask & RESET_IPV6_ADDRESSES) {
+        /*
+         * IPv6. On Linux, when an interface goes down it loses all its IPv6
+         * addresses, so we don't know which connections belonged to that interface
+         * So we clear all unused IPv6 connections on the device by specifying an
+         * empty IPv6 address.
+         */
+        ifc_init6();
+        // This implicitly specifies an address of ::, i.e., kill all IPv6 sockets.
+        memset(&ifr6, 0, sizeof(ifr6));
+        success = ioctl(ifc_ctl_sock6, SIOCKILLADDR,  &ifr6);
+        if (result == 0) {
+            result = success;
+        }
+        ifc_close6();
+    }
+
+    return result;
+#else
+    return 0;
+#endif
+}
+
+/*
+ * Removes the default route for the named interface.
+ */
+int ifc_remove_default_route(const char *ifname)
+{
+    struct rtentry rt;
+    int result;
+
+    ifc_init();
+    memset(&rt, 0, sizeof(rt));
+    rt.rt_dev = (void *)ifname;
+    rt.rt_flags = RTF_UP|RTF_GATEWAY;
+    init_sockaddr_in(&rt.rt_dst, 0);
+    if ((result = ioctl(ifc_ctl_sock, SIOCDELRT, &rt)) < 0) {
+        ALOGD("failed to remove default route for %s: %s", ifname, strerror(errno));
+    }
+    ifc_close();
+    return result;
+}
+
+int
+ifc_configure(const char *ifname,
+        in_addr_t address,
+        uint32_t prefixLength,
+        in_addr_t gateway,
+        in_addr_t dns1,
+        in_addr_t dns2) {
+
+    char dns_prop_name[PROPERTY_KEY_MAX];
+
+    ifc_init();
+
+    if (ifc_up(ifname)) {
+        printerr("failed to turn on interface %s: %s\n", ifname, strerror(errno));
+        ifc_close();
+        return -1;
+    }
+    if (ifc_set_addr(ifname, address)) {
+        printerr("failed to set ipaddr %s: %s\n", ipaddr_to_string(address), strerror(errno));
+        ifc_close();
+        return -1;
+    }
+    if (ifc_set_prefixLength(ifname, prefixLength)) {
+        printerr("failed to set prefixLength %d: %s\n", prefixLength, strerror(errno));
+        ifc_close();
+        return -1;
+    }
+    if (ifc_create_default_route(ifname, gateway)) {
+        printerr("failed to set default route %s: %s\n", ipaddr_to_string(gateway), strerror(errno));
+        ifc_close();
+        return -1;
+    }
+
+    ifc_close();
+
+    snprintf(dns_prop_name, sizeof(dns_prop_name), "net.%s.dns1", ifname);
+    property_set(dns_prop_name, dns1 ? ipaddr_to_string(dns1) : "");
+    snprintf(dns_prop_name, sizeof(dns_prop_name), "net.%s.dns2", ifname);
+    property_set(dns_prop_name, dns2 ? ipaddr_to_string(dns2) : "");
+
+    return 0;
+}