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tun-device: use host_create_netmask() to calculate interface netmask

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This commit is contained in:
Martin Willi 2013-04-16 12:09:18 +02:00
parent 2d8a01d1c6
commit d947d0d61a
1 changed files with 12 additions and 49 deletions
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61
src/libstrongswan/networking/tun_device.c
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@ -75,61 +75,16 @@ struct private_tun_device_t {
int mtu;
};
/**
* Set the sockaddr_t from the given netmask
*/
static void set_netmask(struct ifreq *ifr, int family, u_int8_t netmask)
{
int len, bytes, bits;
char *target;
switch (family)
{
case AF_INET:
{
struct sockaddr_in *addr = (struct sockaddr_in*)&ifr->ifr_addr;
target = (char*)&addr->sin_addr;
len = 4;
break;
}
case AF_INET6:
{
struct sockaddr_in6 *addr = (struct sockaddr_in6*)&ifr->ifr_addr;
target = (char*)&addr->sin6_addr;
len = 16;
break;
}
default:
return;
}
ifr->ifr_addr.sa_family = family;
bytes = (netmask + 7) / 8;
bits = (bytes * 8) - netmask;
memset(target, 0xff, bytes);
memset(target + bytes, 0x00, len - bytes);
target[bytes - 1] = bits ? (u_int8_t)(0xff << bits) : 0xff;
}
METHOD(tun_device_t, set_address, bool,
private_tun_device_t *this, host_t *addr, u_int8_t netmask)
{
struct ifreq ifr;
int family;
family = addr->get_family(addr);
if ((netmask > 32 && family == AF_INET) || netmask > 128)
{
DBG1(DBG_LIB, "failed to set address on %s: invalid netmask",
this->if_name);
return FALSE;
}
host_t *mask;
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, this->if_name, IFNAMSIZ);
memcpy(&ifr.ifr_addr, addr->get_sockaddr(addr), sizeof(sockaddr_t));
memcpy(&ifr.ifr_addr, addr->get_sockaddr(addr),
*addr->get_sockaddr_len(addr));
if (ioctl(this->sock, SIOCSIFADDR, &ifr) < 0)
{
@ -146,7 +101,15 @@ METHOD(tun_device_t, set_address, bool,
}
#endif /* __APPLE__ */
set_netmask(&ifr, family, netmask);
mask = host_create_netmask(addr->get_family(addr), netmask);
if (!mask)
{
DBG1(DBG_LIB, "invalid netmask: %d", netmask);
return FALSE;
}
memcpy(&ifr.ifr_addr, mask->get_sockaddr(mask),
*mask->get_sockaddr_len(mask));
mask->destroy(mask);
if (ioctl(this->sock, SIOCSIFNETMASK, &ifr) < 0)
{