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platform_system_core/libnetutils/ifc_utils.c

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/*
* 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 <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <sys/socket.h>
#include <sys/select.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <linux/if.h>
#include <linux/if_ether.h>
#include <linux/if_arp.h>
#include <linux/sockios.h>
#include <linux/route.h>
#include <linux/ipv6_route.h>
#include <netdb.h>
#include <linux/wireless.h>
#ifdef ANDROID
#define LOG_TAG "NetUtils"
#include <cutils/log.h>
#include <cutils/properties.h>
#else
#include <stdio.h>
#include <string.h>
#define LOGD printf
#define LOGW printf
#endif
static int ifc_ctl_sock = -1;
static int ifc_ctl_sock6 = -1;
void printerr(char *fmt, ...);
#define DBG 0
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)
{
mask = ntohl(mask);
int prefixLength = 0;
uint32_t m = (uint32_t)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 ifc_init(void)
{
int ret;
if (ifc_ctl_sock == -1) {
ifc_ctl_sock = socket(AF_INET, SOCK_DGRAM, 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)
{
if (ifc_ctl_sock6 == -1) {
ifc_ctl_sock6 = socket(AF_INET6, SOCK_DGRAM, 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;
}
}
void ifc_close6(void)
{
if (ifc_ctl_sock6 != -1) {
(void)close(ifc_ctl_sock6);
ifc_ctl_sock6 = -1;
}
}
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;
}
int ifc_set_hwaddr(const char *name, const void *ptr)
{
int r;
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((int)
((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) {
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;
}
/* deprecated v4-only */
int ifc_add_host_route(const char *name, in_addr_t dst)
{
struct in_addr in_dst, in_gw;
in_dst.s_addr = dst;
in_gw.s_addr = 0;
return ifc_act_on_ipv4_route(SIOCADDRT, name, in_dst, 32, in_gw);
}
int ifc_enable(const char *ifname)
{
int result;
ifc_init();
result = ifc_up(ifname);
ifc_close();
return result;
}
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)
{
#ifdef HAVE_ANDROID_OS
int result, success;
in_addr_t myaddr;
struct ifreq ifr;
struct in6_ifreq ifr6;
/* IPv4. Clear connections on the IP address. */
ifc_init();
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();
/*
* 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
}
/*
* Remove the routes associated with the named interface.
*/
int ifc_remove_host_routes(const char *name)
{
char ifname[64];
in_addr_t dest, gway, mask;
int flags, refcnt, use, metric, mtu, win, irtt;
struct rtentry rt;
FILE *fp;
struct in_addr addr;
fp = fopen("/proc/net/route", "r");
if (fp == NULL)
return -1;
/* Skip the header line */
if (fscanf(fp, "%*[^\n]\n") < 0) {
fclose(fp);
return -1;
}
ifc_init();
for (;;) {
int nread = fscanf(fp, "%63s%X%X%X%d%d%d%X%d%d%d\n",
ifname, &dest, &gway, &flags, &refcnt, &use, &metric, &mask,
&mtu, &win, &irtt);
if (nread != 11) {
break;
}
if ((flags & (RTF_UP|RTF_HOST)) != (RTF_UP|RTF_HOST)
|| strcmp(ifname, name) != 0) {
continue;
}
memset(&rt, 0, sizeof(rt));
rt.rt_dev = (void *)name;
init_sockaddr_in(&rt.rt_dst, dest);
init_sockaddr_in(&rt.rt_gateway, gway);
init_sockaddr_in(&rt.rt_genmask, mask);
addr.s_addr = dest;
if (ioctl(ifc_ctl_sock, SIOCDELRT, &rt) < 0) {
LOGD("failed to remove route for %s to %s: %s",
ifname, inet_ntoa(addr), strerror(errno));
}
}
fclose(fp);
ifc_close();
return 0;
}
/*
* Return the address of the default gateway
*
* TODO: factor out common code from this and remove_host_routes()
* so that we only scan /proc/net/route in one place.
*
* DEPRECATED
*/
int ifc_get_default_route(const char *ifname)
{
char name[64];
in_addr_t dest, gway, mask;
int flags, refcnt, use, metric, mtu, win, irtt;
int result;
FILE *fp;
fp = fopen("/proc/net/route", "r");
if (fp == NULL)
return 0;
/* Skip the header line */
if (fscanf(fp, "%*[^\n]\n") < 0) {
fclose(fp);
return 0;
}
ifc_init();
result = 0;
for (;;) {
int nread = fscanf(fp, "%63s%X%X%X%d%d%d%X%d%d%d\n",
name, &dest, &gway, &flags, &refcnt, &use, &metric, &mask,
&mtu, &win, &irtt);
if (nread != 11) {
break;
}
if ((flags & (RTF_UP|RTF_GATEWAY)) == (RTF_UP|RTF_GATEWAY)
&& dest == 0
&& strcmp(ifname, name) == 0) {
result = gway;
break;
}
}
fclose(fp);
ifc_close();
return result;
}
/*
* Sets the specified gateway as the default route for the named interface.
* DEPRECATED
*/
int ifc_set_default_route(const char *ifname, in_addr_t gateway)
{
struct in_addr addr;
int result;
ifc_init();
addr.s_addr = gateway;
if ((result = ifc_create_default_route(ifname, gateway)) < 0) {
LOGD("failed to add %s as default route for %s: %s",
inet_ntoa(addr), ifname, strerror(errno));
}
ifc_close();
return result;
}
/*
* 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) {
LOGD("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;
}
int ifc_act_on_ipv6_route(int action, const char *ifname, struct in6_addr dst, int prefix_length,
struct in6_addr gw)
{
struct in6_rtmsg rtmsg;
int result;
int ifindex;
memset(&rtmsg, 0, sizeof(rtmsg));
ifindex = if_nametoindex(ifname);
if (ifindex == 0) {
printerr("if_nametoindex() failed: interface %s\n", ifname);
return -ENXIO;
}
rtmsg.rtmsg_ifindex = ifindex;
rtmsg.rtmsg_dst = dst;
rtmsg.rtmsg_dst_len = prefix_length;
rtmsg.rtmsg_flags = RTF_UP;
if (prefix_length == 128) {
rtmsg.rtmsg_flags |= RTF_HOST;
}
if (memcmp(&gw, &in6addr_any, sizeof(in6addr_any))) {
rtmsg.rtmsg_flags |= RTF_GATEWAY;
rtmsg.rtmsg_gateway = gw;
}
ifc_init6();
if (ifc_ctl_sock6 < 0) {
return -errno;
}
result = ioctl(ifc_ctl_sock6, action, &rtmsg);
if (result < 0) {
if (errno == EEXIST) {
result = 0;
} else {
result = -errno;
}
}
ifc_close6();
return result;
}
int ifc_act_on_route(int action, const char *ifname, const char *dst, int prefix_length,
const char *gw)
{
int ret = 0;
struct sockaddr_in ipv4_dst, ipv4_gw;
struct sockaddr_in6 ipv6_dst, ipv6_gw;
struct addrinfo hints, *addr_ai, *gw_ai;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC; /* Allow IPv4 or IPv6 */
hints.ai_flags = AI_NUMERICHOST;
ret = getaddrinfo(dst, NULL, &hints, &addr_ai);
if (ret != 0) {
printerr("getaddrinfo failed: invalid address %s\n", dst);
return -EINVAL;
}
if (gw == NULL || (strlen(gw) == 0)) {
if (addr_ai->ai_family == AF_INET6) {
gw = "::";
} else if (addr_ai->ai_family == AF_INET) {
gw = "0.0.0.0";
}
}
if (((addr_ai->ai_family == AF_INET6) && (prefix_length < 0 || prefix_length > 128)) ||
((addr_ai->ai_family == AF_INET) && (prefix_length < 0 || prefix_length > 32))) {
printerr("ifc_add_route: invalid prefix length");
freeaddrinfo(addr_ai);
return -EINVAL;
}
ret = getaddrinfo(gw, NULL, &hints, &gw_ai);
if (ret != 0) {
printerr("getaddrinfo failed: invalid gateway %s\n", gw);
freeaddrinfo(addr_ai);
return -EINVAL;
}
if (addr_ai->ai_family != gw_ai->ai_family) {
printerr("ifc_add_route: different address families: %s and %s\n", dst, gw);
freeaddrinfo(addr_ai);
freeaddrinfo(gw_ai);
return -EINVAL;
}
if (addr_ai->ai_family == AF_INET6) {
memcpy(&ipv6_dst, addr_ai->ai_addr, sizeof(struct sockaddr_in6));
memcpy(&ipv6_gw, gw_ai->ai_addr, sizeof(struct sockaddr_in6));
ret = ifc_act_on_ipv6_route(action, ifname, ipv6_dst.sin6_addr,
prefix_length, ipv6_gw.sin6_addr);
} else if (addr_ai->ai_family == AF_INET) {
memcpy(&ipv4_dst, addr_ai->ai_addr, sizeof(struct sockaddr_in));
memcpy(&ipv4_gw, gw_ai->ai_addr, sizeof(struct sockaddr_in));
ret = ifc_act_on_ipv4_route(action, ifname, ipv4_dst.sin_addr,
prefix_length, ipv4_gw.sin_addr);
} else {
printerr("ifc_add_route: getaddrinfo returned un supported address family %d\n",
addr_ai->ai_family);
ret = -EAFNOSUPPORT;
}
freeaddrinfo(addr_ai);
freeaddrinfo(gw_ai);
return ret;
}
/*
* DEPRECATED
*/
int ifc_add_ipv4_route(const char *ifname, struct in_addr dst, int prefix_length,
struct in_addr gw)
{
int i =ifc_act_on_ipv4_route(SIOCADDRT, ifname, dst, prefix_length, gw);
printerr("ifc_add_ipv4_route(%s, xx, %d, xx) = %d", ifname, prefix_length, i);
return i;
}
/*
* DEPRECATED
*/
int ifc_add_ipv6_route(const char *ifname, struct in6_addr dst, int prefix_length,
struct in6_addr gw)
{
return ifc_act_on_ipv6_route(SIOCADDRT, ifname, dst, prefix_length, gw);
}
int ifc_add_route(const char *ifname, const char *dst, int prefix_length, const char *gw)
{
int i = ifc_act_on_route(SIOCADDRT, ifname, dst, prefix_length, gw);
printerr("ifc_add_route(%s, %s, %d, %s) = %d", ifname, dst, prefix_length, gw, i);
return i;
}
int ifc_remove_route(const char *ifname, const char*dst, int prefix_length, const char *gw)
{
return ifc_act_on_route(SIOCDELRT, ifname, dst, prefix_length, gw);
}
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