hostap/src/drivers/linux_ioctl.c
Jouni Malinen 0f0120148a Verify that readlink() did not truncate result
linux_br_get() was forcing null termination on the buffer, but did not
check whether the string could have been truncated. Make this more
strict by rejecting any truncation case.

Signed-hostap: Jouni Malinen <j@w1.fi>
2013-10-26 15:55:39 +03:00

221 lines
4.5 KiB
C

/*
* Linux ioctl helper functions for driver wrappers
* Copyright (c) 2002-2010, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "utils/includes.h"
#include <sys/ioctl.h>
#include <net/if.h>
#include <net/if_arp.h>
#include "utils/common.h"
#include "linux_ioctl.h"
int linux_set_iface_flags(int sock, const char *ifname, int dev_up)
{
struct ifreq ifr;
int ret;
if (sock < 0)
return -1;
os_memset(&ifr, 0, sizeof(ifr));
os_strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
if (ioctl(sock, SIOCGIFFLAGS, &ifr) != 0) {
ret = errno ? -errno : -999;
wpa_printf(MSG_ERROR, "Could not read interface %s flags: %s",
ifname, strerror(errno));
return ret;
}
if (dev_up) {
if (ifr.ifr_flags & IFF_UP)
return 0;
ifr.ifr_flags |= IFF_UP;
} else {
if (!(ifr.ifr_flags & IFF_UP))
return 0;
ifr.ifr_flags &= ~IFF_UP;
}
if (ioctl(sock, SIOCSIFFLAGS, &ifr) != 0) {
ret = errno ? -errno : -999;
wpa_printf(MSG_ERROR, "Could not set interface %s flags (%s): "
"%s",
ifname, dev_up ? "UP" : "DOWN", strerror(errno));
return ret;
}
return 0;
}
int linux_iface_up(int sock, const char *ifname)
{
struct ifreq ifr;
int ret;
if (sock < 0)
return -1;
os_memset(&ifr, 0, sizeof(ifr));
os_strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
if (ioctl(sock, SIOCGIFFLAGS, &ifr) != 0) {
ret = errno ? -errno : -999;
wpa_printf(MSG_ERROR, "Could not read interface %s flags: %s",
ifname, strerror(errno));
return ret;
}
return !!(ifr.ifr_flags & IFF_UP);
}
int linux_get_ifhwaddr(int sock, const char *ifname, u8 *addr)
{
struct ifreq ifr;
os_memset(&ifr, 0, sizeof(ifr));
os_strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
if (ioctl(sock, SIOCGIFHWADDR, &ifr)) {
wpa_printf(MSG_ERROR, "Could not get interface %s hwaddr: %s",
ifname, strerror(errno));
return -1;
}
if (ifr.ifr_hwaddr.sa_family != ARPHRD_ETHER) {
wpa_printf(MSG_ERROR, "%s: Invalid HW-addr family 0x%04x",
ifname, ifr.ifr_hwaddr.sa_family);
return -1;
}
os_memcpy(addr, ifr.ifr_hwaddr.sa_data, ETH_ALEN);
return 0;
}
int linux_set_ifhwaddr(int sock, const char *ifname, const u8 *addr)
{
struct ifreq ifr;
os_memset(&ifr, 0, sizeof(ifr));
os_strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
os_memcpy(ifr.ifr_hwaddr.sa_data, addr, ETH_ALEN);
ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
if (ioctl(sock, SIOCSIFHWADDR, &ifr)) {
wpa_printf(MSG_DEBUG, "Could not set interface %s hwaddr: %s",
ifname, strerror(errno));
return -1;
}
return 0;
}
#ifndef SIOCBRADDBR
#define SIOCBRADDBR 0x89a0
#endif
#ifndef SIOCBRDELBR
#define SIOCBRDELBR 0x89a1
#endif
#ifndef SIOCBRADDIF
#define SIOCBRADDIF 0x89a2
#endif
#ifndef SIOCBRDELIF
#define SIOCBRDELIF 0x89a3
#endif
int linux_br_add(int sock, const char *brname)
{
if (ioctl(sock, SIOCBRADDBR, brname) < 0) {
wpa_printf(MSG_DEBUG, "Could not add bridge %s: %s",
brname, strerror(errno));
return -1;
}
return 0;
}
int linux_br_del(int sock, const char *brname)
{
if (ioctl(sock, SIOCBRDELBR, brname) < 0) {
wpa_printf(MSG_DEBUG, "Could not remove bridge %s: %s",
brname, strerror(errno));
return -1;
}
return 0;
}
int linux_br_add_if(int sock, const char *brname, const char *ifname)
{
struct ifreq ifr;
int ifindex;
ifindex = if_nametoindex(ifname);
if (ifindex == 0)
return -1;
os_memset(&ifr, 0, sizeof(ifr));
os_strlcpy(ifr.ifr_name, brname, IFNAMSIZ);
ifr.ifr_ifindex = ifindex;
if (ioctl(sock, SIOCBRADDIF, &ifr) < 0) {
wpa_printf(MSG_DEBUG, "Could not add interface %s into bridge "
"%s: %s", ifname, brname, strerror(errno));
return -1;
}
return 0;
}
int linux_br_del_if(int sock, const char *brname, const char *ifname)
{
struct ifreq ifr;
int ifindex;
ifindex = if_nametoindex(ifname);
if (ifindex == 0)
return -1;
os_memset(&ifr, 0, sizeof(ifr));
os_strlcpy(ifr.ifr_name, brname, IFNAMSIZ);
ifr.ifr_ifindex = ifindex;
if (ioctl(sock, SIOCBRDELIF, &ifr) < 0) {
wpa_printf(MSG_DEBUG, "Could not remove interface %s from "
"bridge %s: %s", ifname, brname, strerror(errno));
return -1;
}
return 0;
}
int linux_br_get(char *brname, const char *ifname)
{
char path[128], brlink[128], *pos;
ssize_t res;
os_snprintf(path, sizeof(path), "/sys/class/net/%s/brport/bridge",
ifname);
res = readlink(path, brlink, sizeof(brlink));
if (res < 0 || (size_t) res >= sizeof(brlink))
return -1;
brlink[res] = '\0';
pos = os_strrchr(brlink, '/');
if (pos == NULL)
return -1;
pos++;
os_strlcpy(brname, pos, IFNAMSIZ);
return 0;
}