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/*
* ipconfig/netdev.c
*
* ioctl-based device configuration
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <netinet/in.h>
#include <net/route.h>
#include "netdev.h"
static int cfd = -1;
static void copy_name(struct netdev *dev, struct ifreq *ifr)
{
strncpy(ifr->ifr_name, dev->name, sizeof(ifr->ifr_name));
ifr->ifr_name[sizeof(ifr->ifr_name) - 1] = '\0';
}
int netdev_getflags(struct netdev *dev, short *flags)
{
struct ifreq ifr;
copy_name(dev, &ifr);
if (ioctl(cfd, SIOCGIFFLAGS, &ifr) == -1) {
perror("SIOCGIFFLAGS");
return -1;
}
*flags = ifr.ifr_flags;
return 0;
}
static int netdev_sif_addr(struct ifreq *ifr, int cmd, __u32 addr)
{
struct sockaddr_in *sin = (struct sockaddr_in *)&ifr->ifr_addr;
sin->sin_family = AF_INET;
sin->sin_addr.s_addr = addr;
return ioctl(cfd, cmd, ifr);
}
int netdev_setaddress(struct netdev *dev)
{
struct ifreq ifr;
copy_name(dev, &ifr);
if (dev->ip_addr != INADDR_ANY &&
netdev_sif_addr(&ifr, SIOCSIFADDR, dev->ip_addr) == -1) {
perror("SIOCSIFADDR");
return -1;
}
if (dev->ip_broadcast != INADDR_ANY &&
netdev_sif_addr(&ifr, SIOCSIFBRDADDR, dev->ip_broadcast) == -1) {
perror("SIOCSIFBRDADDR");
return -1;
}
if (dev->ip_netmask != INADDR_ANY &&
netdev_sif_addr(&ifr, SIOCSIFNETMASK, dev->ip_netmask) == -1) {
perror("SIOCSIFNETMASK");
return -1;
}
return 0;
}
int netdev_setdefaultroute(struct netdev *dev)
{
struct rtentry r;
if (dev->ip_gateway == INADDR_ANY)
return 0;
memset(&r, 0, sizeof(r));
((struct sockaddr_in *)&r.rt_dst)->sin_family = AF_INET;
((struct sockaddr_in *)&r.rt_dst)->sin_addr.s_addr = INADDR_ANY;
((struct sockaddr_in *)&r.rt_gateway)->sin_family = AF_INET;
((struct sockaddr_in *)&r.rt_gateway)->sin_addr.s_addr = dev->ip_gateway;
((struct sockaddr_in *)&r.rt_genmask)->sin_family = AF_INET;
((struct sockaddr_in *)&r.rt_genmask)->sin_addr.s_addr = INADDR_ANY;
r.rt_flags = RTF_UP | RTF_GATEWAY;
if (ioctl(cfd, SIOCADDRT, &r) == -1 && errno != EEXIST) {
perror("SIOCADDRT");
return -1;
}
return 0;
}
int netdev_setmtu(struct netdev *dev)
{
struct ifreq ifr;
copy_name(dev, &ifr);
ifr.ifr_mtu = dev->mtu;
return ioctl(cfd, SIOCSIFMTU, &ifr);
}
static int netdev_gif_addr(struct ifreq *ifr, int cmd, __u32 *ptr)
{
struct sockaddr_in *sin = (struct sockaddr_in *)&ifr->ifr_addr;
if (ioctl(cfd, cmd, ifr) == -1)
return -1;
*ptr = sin->sin_addr.s_addr;
return 0;
}
int netdev_up(struct netdev *dev)
{
struct ifreq ifr;
copy_name(dev, &ifr);
if (ioctl(cfd, SIOCGIFFLAGS, &ifr) == -1) {
perror("SIOCGIFFLAGS");
return -1;
}
ifr.ifr_flags |= IFF_UP;
if (ioctl(cfd, SIOCSIFFLAGS, &ifr) == -1) {
perror("SIOCSIFFLAGS");
return -1;
}
return 0;
}
int netdev_down(struct netdev *dev)
{
struct ifreq ifr;
copy_name(dev, &ifr);
if (ioctl(cfd, SIOCGIFFLAGS, &ifr) == -1) {
perror("SIOCGIFFLAGS");
return -1;
}
ifr.ifr_flags &= ~IFF_UP;
if (ioctl(cfd, SIOCSIFFLAGS, &ifr) == -1) {
perror("SIOCSIFFLAGS");
return -1;
}
return 0;
}
int netdev_init_if(struct netdev *dev)
{
struct ifreq ifr;
if (cfd == -1)
cfd = socket(AF_INET, SOCK_DGRAM, 0);
if (cfd == -1) {
perror("socket(AF_INET)");
return -1;
}
copy_name(dev, &ifr);
if (ioctl(cfd, SIOCGIFINDEX, &ifr) == -1) {
perror("SIOCGIFINDEX");
return -1;
}
dev->ifindex = ifr.ifr_ifindex;
if (ioctl(cfd, SIOCGIFMTU, &ifr) == -1) {
perror("SIOCGIFMTU");
return -1;
}
dev->mtu = ifr.ifr_mtu;
if (ioctl(cfd, SIOCGIFHWADDR, &ifr) == -1) {
perror("SIOCGIFHWADDR");
return -1;
}
dev->hwtype = ifr.ifr_hwaddr.sa_family;
dev->hwlen = 0;
switch (dev->hwtype) {
case ARPHRD_ETHER:
dev->hwlen = 6;
break;
case ARPHRD_EUI64:
dev->hwlen = 8;
break;
case ARPHRD_LOOPBACK:
dev->hwlen = 0;
break;
default:
return -1;
}
memcpy(dev->hwaddr, ifr.ifr_hwaddr.sa_data, dev->hwlen);
memset(dev->hwbrd, 0xff, dev->hwlen);
/*
* Try to get the current interface information.
*/
if (dev->ip_addr == INADDR_NONE &&
netdev_gif_addr(&ifr, SIOCGIFADDR, &dev->ip_addr) == -1) {
perror("SIOCGIFADDR");
dev->ip_addr = 0;
dev->ip_broadcast = 0;
dev->ip_netmask = 0;
return 0;
}
if (dev->ip_broadcast == INADDR_NONE &&
netdev_gif_addr(&ifr, SIOCGIFBRDADDR, &dev->ip_broadcast) == -1) {
perror("SIOCGIFBRDADDR");
dev->ip_broadcast = 0;
}
if (dev->ip_netmask == INADDR_NONE &&
netdev_gif_addr(&ifr, SIOCGIFNETMASK, &dev->ip_netmask) == -1) {
perror("SIOCGIFNETMASK");
dev->ip_netmask = 0;
}
return 0;
}
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