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/*
* netsniff-ng - the packet sniffing beast
* Copyright 2012 Daniel Borkmann.
* Subject to the GPL, version 2.
* Parts derived from iw, subject to ISC license.
* Copyright 2007, 2008 Johannes Berg
* Copyright 2007 Andy Lutomirski
* Copyright 2007 Mike Kershaw
* Copyright 2008-2009 Luis R. Rodriguez
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <limits.h>
#include <linux/nl80211.h>
#include <libnl3/netlink/genl/genl.h>
#include <libnl3/netlink/genl/family.h>
#include <libnl3/netlink/genl/ctrl.h>
#include <libnl3/netlink/msg.h>
#include <libnl3/netlink/attr.h>
#include "die.h"
#include "xutils.h"
#include "mac80211.h"
#include "xmalloc.h"
#include "built_in.h"
struct nl80211_state {
struct nl_sock *nl_sock;
struct nl_cache *nl_cache;
struct genl_family *nl80211;
};
static void get_mac80211_phydev(const char *device, char *phydev_path,
size_t phydev_len)
{
int ret;
char *pathstr;
ssize_t num;
ret = asprintf(&pathstr, "/sys/class/net/%s/phy80211", device);
if (ret < 0)
panic("Can't generate path name string for /sys/class/net device");
num = readlink(pathstr, phydev_path, phydev_len);
if (num < 0) {
if (errno == ENOENT || errno == EINVAL)
panic("It's probably not a mac80211 device!\n");
panic("Can't readlink %s: %s!\n", pathstr, strerror(errno));
}
xfree(pathstr);
phydev_path[min(num, phydev_len - 1)] = 0;
}
static inline struct nl_msg *nl80211_nlmsg_xalloc(void)
{
struct nl_msg *ret = nlmsg_alloc();
if (!ret)
panic("Cannot allocate nlmsg memory!\n");
return ret;
}
static inline struct nl_sock *nl80211_nl_socket_xalloc(void)
{
struct nl_sock *ret = nl_socket_alloc();
if (!ret)
panic("Cannot allocate nl socket memory!\n");
return ret;
}
static void nl80211_init(struct nl80211_state *state, const char *device)
{
int ret;
state->nl_sock = nl80211_nl_socket_xalloc();
ret = genl_connect(state->nl_sock);
if (ret)
panic("Cannot connect generic netlink!\n");
ret = genl_ctrl_alloc_cache(state->nl_sock, &state->nl_cache);
if (ret < 0)
panic("Failed to allocate generic netlink cache: %s!",
nl_geterror(-ret));
state->nl80211 = genl_ctrl_search_by_name(state->nl_cache, "nl80211");
if (!state->nl80211)
panic("nl80211 not found in netlink cache!\n");
}
static void nl80211_cleanup(struct nl80211_state *state)
{
genl_family_put(state->nl80211);
nl_cache_free(state->nl_cache);
nl_socket_free(state->nl_sock);
}
static int nl80211_add_mon_if(struct nl80211_state *state, const char *device,
const char *mondevice)
{
int ifindex, ret;
struct nl_msg *msg;
ifindex = device_ifindex(device);
msg = nl80211_nlmsg_xalloc();
genlmsg_put(msg, 0, 0, genl_family_get_id(state->nl80211), 0,
0, NL80211_CMD_NEW_INTERFACE, 0);
NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, ifindex);
NLA_PUT_STRING(msg, NL80211_ATTR_IFNAME, mondevice);
NLA_PUT_U32(msg, NL80211_ATTR_IFTYPE, NL80211_IFTYPE_MONITOR);
ret = nl_send_auto_complete(state->nl_sock, msg);
if (ret < 0) {
if (ret == -ENFILE) {
nlmsg_free(msg);
return -EBUSY;
}
panic("Cannot send_auto_complete!\n");
}
ret = nl_wait_for_ack(state->nl_sock);
if (ret < 0) {
if (ret == -ENFILE) {
nlmsg_free(msg);
return -EBUSY;
}
panic("Waiting for netlink ack failed!\n");
}
nlmsg_free(msg);
return 0;
nla_put_failure:
panic("nla put failure!\n");
return -EIO; /* dummy */
}
static int nl80211_del_mon_if(struct nl80211_state *state, const char *device,
const char *mondevice)
{
int ifindex, ret;
struct nl_msg *msg;
ifindex = device_ifindex(mondevice);
msg = nl80211_nlmsg_xalloc();
genlmsg_put(msg, 0, 0, genl_family_get_id(state->nl80211), 0,
0, NL80211_CMD_DEL_INTERFACE, 0);
NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, ifindex);
ret = nl_send_auto_complete(state->nl_sock, msg);
if (ret < 0)
panic("Cannot send_auto_complete!\n");
ret = nl_wait_for_ack(state->nl_sock);
if (ret < 0)
panic("Waiting for netlink ack failed!\n");
nlmsg_free(msg);
return 0;
nla_put_failure:
panic("nla put failure!\n");
return -EIO; /* dummy */
}
void enter_rfmon_mac80211(const char *device, char **mondev)
{
int ret;
short flags;
uint32_t n;
char phydev_path[256];
struct nl80211_state nlstate;
/* XXX: is this already a monN device? */
get_mac80211_phydev(device, phydev_path, sizeof(phydev_path));
nl80211_init(&nlstate, device);
for (n = 0; n < UINT_MAX; n++) {
char mondevice[32];
slprintf(mondevice, sizeof(mondevice), "mon%u", n);
ret = nl80211_add_mon_if(&nlstate, device, mondevice);
if (ret == 0) {
*mondev = xstrdup(mondevice);
flags = device_get_flags(*mondev);
flags |= IFF_UP | IFF_RUNNING;
device_set_flags(*mondev, flags);
nl80211_cleanup(&nlstate);
return;
}
}
panic("No free monN interfaces!\n");
}
void leave_rfmon_mac80211(const char *device, const char *mondev)
{
short flags;
struct nl80211_state nlstate;
flags = device_get_flags(mondev);
flags &= ~(IFF_UP | IFF_RUNNING);
device_set_flags(mondev, flags);
nl80211_init(&nlstate, device);
nl80211_del_mon_if(&nlstate, device, mondev);
nl80211_cleanup(&nlstate);
}
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