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iwd/src/netdev.c
James Prestwood 3f2c84c2a2 netdev: fix segfault due to roaming before connected 
In this situation the kernel is sending a low RSSI event which netdev
picks up, but since we set netdev->connected so early the event is
forwarded to station before IWD has fully connected. Station then
tries to get a neighbor report, which may fail and cause a known
frequency scan. If this is a new network the frequency scan tries to
get any known frequencies in network_info which will be unset and
cause a segfault.

This can be avoided by only sending RSSI events when netdev->operational
is set rather than netdev->connected.
2020-05-01 20:42:58 -05:00

4805 lines
118 KiB
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/*
*
* Wireless daemon for Linux
*
* Copyright (C) 2013-2019 Intel Corporation. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <alloca.h>
#include <stdio.h>
#include <linux/rtnetlink.h>
#include <net/if_arp.h>
#include <linux/if.h>
#include <linux/if_packet.h>
#include <linux/if_ether.h>
#include <arpa/inet.h>
#include <linux/filter.h>
#include <sys/socket.h>
#include <errno.h>
#include <ell/ell.h>
#include "linux/nl80211.h"
#include "src/iwd.h"
#include "src/module.h"
#include "src/wiphy.h"
#include "src/ie.h"
#include "src/mpdu.h"
#include "src/eapol.h"
#include "src/handshake.h"
#include "src/crypto.h"
#include "src/scan.h"
#include "src/netdev.h"
#include "src/ft.h"
#include "src/util.h"
#include "src/watchlist.h"
#include "src/sae.h"
#include "src/nl80211util.h"
#include "src/nl80211cmd.h"
#include "src/owe.h"
#include "src/fils.h"
#include "src/auth-proto.h"
#include "src/frame-xchg.h"
#ifndef ENOTSUPP
#define ENOTSUPP 524
#endif
static uint32_t unicast_watch;
struct netdev_handshake_state {
struct handshake_state super;
uint32_t pairwise_new_key_cmd_id;
uint32_t group_new_key_cmd_id;
uint32_t group_management_new_key_cmd_id;
uint32_t set_station_cmd_id;
bool ptk_installed;
bool gtk_installed;
bool igtk_installed;
bool complete;
struct netdev *netdev;
};
struct netdev {
uint32_t index;
uint64_t wdev_id;
char name[IFNAMSIZ];
uint32_t type;
uint8_t addr[ETH_ALEN];
struct wiphy *wiphy;
unsigned int ifi_flags;
uint32_t frequency;
uint32_t prev_frequency;
netdev_event_func_t event_filter;
netdev_connect_cb_t connect_cb;
netdev_disconnect_cb_t disconnect_cb;
netdev_neighbor_report_cb_t neighbor_report_cb;
netdev_command_cb_t adhoc_cb;
void *user_data;
struct eapol_sm *sm;
struct sae_sm *sae_sm;
struct auth_proto *ap;
struct handshake_state *handshake;
uint32_t connect_cmd_id;
uint32_t disconnect_cmd_id;
uint32_t join_adhoc_cmd_id;
uint32_t leave_adhoc_cmd_id;
uint32_t set_interface_cmd_id;
uint32_t rekey_offload_cmd_id;
uint32_t qos_map_cmd_id;
uint32_t mac_change_cmd_id;
enum netdev_result result;
uint16_t last_code; /* reason or status, depending on result */
struct l_timeout *neighbor_report_timeout;
struct l_timeout *sa_query_timeout;
struct l_timeout *group_handshake_timeout;
struct l_timeout *gas_timeout;
uint16_t sa_query_id;
uint8_t prev_bssid[ETH_ALEN];
uint8_t prev_snonce[32];
int8_t rssi_levels[16];
uint8_t rssi_levels_num;
uint8_t cur_rssi_level_idx;
int8_t cur_rssi;
struct l_timeout *rssi_poll_timeout;
uint32_t rssi_poll_cmd_id;
uint8_t set_mac_once[6];
uint32_t set_powered_cmd_id;
netdev_command_cb_t set_powered_cb;
void *set_powered_user_data;
netdev_destroy_func_t set_powered_destroy;
struct watchlist station_watches;
struct l_io *pae_io; /* for drivers without EAPoL over NL80211 */
bool connected : 1;
bool operational : 1;
bool rekey_offload_support : 1;
bool pae_over_nl80211 : 1;
bool in_ft : 1;
bool cur_rssi_low : 1;
bool use_4addr : 1;
bool ignore_connect_event : 1;
bool expect_connect_failure : 1;
bool aborting : 1;
bool events_ready : 1;
};
struct netdev_preauth_state {
netdev_preauthenticate_cb_t cb;
void *user_data;
struct netdev *netdev;
};
struct netdev_watch {
uint32_t id;
netdev_watch_func_t callback;
void *user_data;
};
static struct l_netlink *rtnl = NULL;
static struct l_genl_family *nl80211;
static struct l_queue *netdev_list;
static struct watchlist netdev_watches;
static bool pae_over_nl80211;
static bool mac_per_ssid;
/* Cancels ongoing GTK/IGTK related commands (if any) */
static void netdev_handshake_state_cancel_rekey(
struct netdev_handshake_state *nhs)
{
if (nhs->group_new_key_cmd_id) {
l_genl_family_cancel(nl80211, nhs->group_new_key_cmd_id);
nhs->group_new_key_cmd_id = 0;
}
if (nhs->group_management_new_key_cmd_id) {
l_genl_family_cancel(nl80211,
nhs->group_management_new_key_cmd_id);
nhs->group_management_new_key_cmd_id = 0;
}
}
static void netdev_handshake_state_cancel_all(
struct netdev_handshake_state *nhs)
{
if (nhs->pairwise_new_key_cmd_id) {
l_genl_family_cancel(nl80211, nhs->pairwise_new_key_cmd_id);
nhs->pairwise_new_key_cmd_id = 0;
}
netdev_handshake_state_cancel_rekey(nhs);
if (nhs->set_station_cmd_id) {
l_genl_family_cancel(nl80211, nhs->set_station_cmd_id);
nhs->set_station_cmd_id = 0;
}
}
static void netdev_handshake_state_free(struct handshake_state *hs)
{
struct netdev_handshake_state *nhs =
l_container_of(hs, struct netdev_handshake_state, super);
netdev_handshake_state_cancel_all(nhs);
l_free(nhs);
}
struct handshake_state *netdev_handshake_state_new(struct netdev *netdev)
{
struct netdev_handshake_state *nhs;
nhs = l_new(struct netdev_handshake_state, 1);
nhs->super.ifindex = netdev->index;
nhs->super.free = netdev_handshake_state_free;
nhs->netdev = netdev;
/*
* Since GTK/IGTK are optional (NO_GROUP_TRAFFIC), we set them as
* 'installed' upon initialization. If/When the gtk/igtk callback is
* called they will get set to false until we have received a successful
* callback from nl80211. From these callbacks we can check that all
* the keys have been installed, and only then trigger the handshake
* complete callback.
*/
nhs->gtk_installed = true;
nhs->igtk_installed = true;
return &nhs->super;
}
struct wiphy *netdev_get_wiphy(struct netdev *netdev)
{
return netdev->wiphy;
}
const uint8_t *netdev_get_address(struct netdev *netdev)
{
return netdev->addr;
}
uint32_t netdev_get_ifindex(struct netdev *netdev)
{
return netdev->index;
}
uint64_t netdev_get_wdev_id(struct netdev *netdev)
{
return netdev->wdev_id;
}
enum netdev_iftype netdev_get_iftype(struct netdev *netdev)
{
switch (netdev->type) {
case NL80211_IFTYPE_STATION:
return NETDEV_IFTYPE_STATION;
case NL80211_IFTYPE_AP:
return NETDEV_IFTYPE_AP;
case NL80211_IFTYPE_ADHOC:
return NETDEV_IFTYPE_ADHOC;
case NL80211_IFTYPE_P2P_CLIENT:
return NETDEV_IFTYPE_P2P_CLIENT;
case NL80211_IFTYPE_P2P_GO:
return NETDEV_IFTYPE_P2P_GO;
default:
/* can't really do much here */
l_error("unknown iftype %u", netdev->type);
return NETDEV_IFTYPE_STATION;
}
}
const char *netdev_get_name(struct netdev *netdev)
{
return netdev->name;
}
bool netdev_get_is_up(struct netdev *netdev)
{
bool powered = (netdev->ifi_flags & IFF_UP) != 0;
/*
* If we are in the middle of changing the MAC we are in somewhat of a
* no mans land. Technically the iface may be down, but since we are
* not emitting any netdev DOWN events we want netdev_get_is_up to
* reflect the same state. Once MAC changing finishes any pending
* DOWN events will be emitted.
*/
if (netdev->mac_change_cmd_id && !powered)
return true;
return powered;
}
struct handshake_state *netdev_get_handshake(struct netdev *netdev)
{
return netdev->handshake;
}
const char *netdev_get_path(struct netdev *netdev)
{
static char path[256];
L_WARN_ON(snprintf(path, sizeof(path), "%s/%u",
wiphy_get_path(netdev->wiphy),
netdev->index) >= (int) sizeof(path));
path[sizeof(path) - 1] = '\0';
return path;
}
static void netdev_set_powered_result(int error, uint16_t type,
const void *data,
uint32_t len, void *user_data)
{
struct netdev *netdev = user_data;
if (netdev->set_powered_cb)
netdev->set_powered_cb(netdev, error,
netdev->set_powered_user_data);
netdev->set_powered_cb = NULL;
}
static void netdev_set_powered_destroy(void *user_data)
{
struct netdev *netdev = user_data;
netdev->set_powered_cmd_id = 0;
if (netdev->set_powered_destroy)
netdev->set_powered_destroy(netdev->set_powered_user_data);
netdev->set_powered_destroy = NULL;
netdev->set_powered_user_data = NULL;
}
int netdev_set_powered(struct netdev *netdev, bool powered,
netdev_command_cb_t callback, void *user_data,
netdev_destroy_func_t destroy)
{
if (netdev->set_powered_cmd_id ||
netdev->set_interface_cmd_id)
return -EBUSY;
netdev->set_powered_cmd_id =
l_rtnl_set_powered(rtnl, netdev->index, powered,
netdev_set_powered_result, netdev,
netdev_set_powered_destroy);
if (!netdev->set_powered_cmd_id)
return -EIO;
netdev->set_powered_cb = callback;
netdev->set_powered_user_data = user_data;
netdev->set_powered_destroy = destroy;
return 0;
}
static void netdev_set_rssi_level_idx(struct netdev *netdev)
{
uint8_t new_level;
for (new_level = 0; new_level < netdev->rssi_levels_num; new_level++)
if (netdev->cur_rssi >= netdev->rssi_levels[new_level])
break;
netdev->cur_rssi_level_idx = new_level;
}
static void netdev_rssi_poll_cb(struct l_genl_msg *msg, void *user_data)
{
struct netdev *netdev = user_data;
struct l_genl_attr attr, nested;
uint16_t type, len;
const void *data;
bool found;
uint8_t prev_rssi_level_idx = netdev->cur_rssi_level_idx;
netdev->rssi_poll_cmd_id = 0;
if (!l_genl_attr_init(&attr, msg))
goto done;
found = false;
while (l_genl_attr_next(&attr, &type, &len, &data)) {
if (type != NL80211_ATTR_STA_INFO)
continue;
found = true;
break;
}
if (!found || !l_genl_attr_recurse(&attr, &nested))
goto done;
found = false;
while (l_genl_attr_next(&nested, &type, &len, &data)) {
if (type != NL80211_STA_INFO_SIGNAL_AVG)
continue;
if (len != 1)
continue;
found = true;
netdev->cur_rssi = *(const int8_t *) data;
break;
}
if (!found)
goto done;
/*
* Note we don't have to handle LOW_SIGNAL_THRESHOLD here. The
* CQM single threshold RSSI monitoring should work even if the
* kernel driver doesn't support multiple thresholds. So the
* polling only handles the client-supplied threshold list.
*/
netdev_set_rssi_level_idx(netdev);
if (netdev->cur_rssi_level_idx != prev_rssi_level_idx)
netdev->event_filter(netdev, NETDEV_EVENT_RSSI_LEVEL_NOTIFY,
&netdev->cur_rssi_level_idx,
netdev->user_data);
done:
/* Rearm timer */
l_timeout_modify(netdev->rssi_poll_timeout, 6);
}
static void netdev_rssi_poll(struct l_timeout *timeout, void *user_data)
{
struct netdev *netdev = user_data;
struct l_genl_msg *msg;
msg = l_genl_msg_new_sized(NL80211_CMD_GET_STATION, 64);
l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &netdev->index);
l_genl_msg_append_attr(msg, NL80211_ATTR_MAC, ETH_ALEN,
netdev->handshake->aa);
netdev->rssi_poll_cmd_id = l_genl_family_send(nl80211, msg,
netdev_rssi_poll_cb,
netdev, NULL);
}
/* To be called whenever operational or rssi_levels_num are updated */
static void netdev_rssi_polling_update(struct netdev *netdev)
{
if (wiphy_has_ext_feature(netdev->wiphy,
NL80211_EXT_FEATURE_CQM_RSSI_LIST))
return;
if (netdev->operational && netdev->rssi_levels_num > 0) {
if (netdev->rssi_poll_timeout)
return;
netdev->rssi_poll_timeout =
l_timeout_create(1, netdev_rssi_poll, netdev, NULL);
} else {
if (!netdev->rssi_poll_timeout)
return;
l_timeout_remove(netdev->rssi_poll_timeout);
netdev->rssi_poll_timeout = NULL;
if (netdev->rssi_poll_cmd_id) {
l_genl_family_cancel(nl80211, netdev->rssi_poll_cmd_id);
netdev->rssi_poll_cmd_id = 0;
}
}
}
static void netdev_preauth_destroy(void *data)
{
struct netdev_preauth_state *state = data;
if (state->cb)
state->cb(state->netdev, NETDEV_RESULT_ABORTED, NULL,
state->user_data);
l_free(state);
}
static void netdev_connect_free(struct netdev *netdev)
{
if (netdev->sm) {
eapol_sm_free(netdev->sm);
netdev->sm = NULL;
}
if (netdev->ap) {
auth_proto_free(netdev->ap);
netdev->ap = NULL;
}
eapol_preauth_cancel(netdev->index);
if (netdev->handshake) {
handshake_state_free(netdev->handshake);
netdev->handshake = NULL;
}
if (netdev->neighbor_report_cb) {
netdev->neighbor_report_cb(netdev, -ENOTCONN, NULL, 0,
netdev->user_data);
netdev->neighbor_report_cb = NULL;
l_timeout_remove(netdev->neighbor_report_timeout);
}
if (netdev->sa_query_timeout) {
l_timeout_remove(netdev->sa_query_timeout);
netdev->sa_query_timeout = NULL;
}
if (netdev->group_handshake_timeout) {
l_timeout_remove(netdev->group_handshake_timeout);
netdev->group_handshake_timeout = NULL;
}
netdev->operational = false;
netdev->connected = false;
netdev->connect_cb = NULL;
netdev->event_filter = NULL;
netdev->user_data = NULL;
netdev->result = NETDEV_RESULT_OK;
netdev->last_code = 0;
netdev->in_ft = false;
netdev->ignore_connect_event = false;
netdev->expect_connect_failure = false;
netdev_rssi_polling_update(netdev);
if (netdev->connect_cmd_id) {
l_genl_family_cancel(nl80211, netdev->connect_cmd_id);
netdev->connect_cmd_id = 0;
} else if (netdev->disconnect_cmd_id) {
l_genl_family_cancel(nl80211, netdev->disconnect_cmd_id);
netdev->disconnect_cmd_id = 0;
}
}
static void netdev_connect_failed(struct netdev *netdev,
enum netdev_result result,
uint16_t status_or_reason)
{
netdev_connect_cb_t connect_cb = netdev->connect_cb;
netdev_event_func_t event_filter = netdev->event_filter;
void *connect_data = netdev->user_data;
netdev->disconnect_cmd_id = 0;
/* Done this way to allow re-entrant netdev_connect calls */
netdev_connect_free(netdev);
if (connect_cb)
connect_cb(netdev, result, &status_or_reason, connect_data);
else if (event_filter)
event_filter(netdev, NETDEV_EVENT_DISCONNECT_BY_SME,
&status_or_reason,
connect_data);
}
static void netdev_disconnect_cb(struct l_genl_msg *msg, void *user_data)
{
struct netdev *netdev = user_data;
netdev_connect_failed(netdev, netdev->result, netdev->last_code);
}
static void netdev_free(void *data)
{
struct netdev *netdev = data;
l_debug("Freeing netdev %s[%d]", netdev->name, netdev->index);
if (netdev->neighbor_report_cb) {
netdev->neighbor_report_cb(netdev, -ENODEV, NULL, 0,
netdev->user_data);
netdev->neighbor_report_cb = NULL;
l_timeout_remove(netdev->neighbor_report_timeout);
}
if (netdev->connected)
netdev_connect_free(netdev);
else if (netdev->disconnect_cmd_id) {
l_genl_family_cancel(nl80211, netdev->disconnect_cmd_id);
netdev->disconnect_cmd_id = 0;
if (netdev->disconnect_cb)
netdev->disconnect_cb(netdev, true, netdev->user_data);
netdev->disconnect_cb = NULL;
netdev->user_data = NULL;
}
if (netdev->join_adhoc_cmd_id) {
l_genl_family_cancel(nl80211, netdev->join_adhoc_cmd_id);
netdev->join_adhoc_cmd_id = 0;
}
if (netdev->leave_adhoc_cmd_id) {
l_genl_family_cancel(nl80211, netdev->leave_adhoc_cmd_id);
netdev->leave_adhoc_cmd_id = 0;
}
if (netdev->set_powered_cmd_id) {
l_netlink_cancel(rtnl, netdev->set_powered_cmd_id);
netdev->set_powered_cmd_id = 0;
}
if (netdev->rekey_offload_cmd_id) {
l_genl_family_cancel(nl80211, netdev->rekey_offload_cmd_id);
netdev->rekey_offload_cmd_id = 0;
}
if (netdev->qos_map_cmd_id) {
l_genl_family_cancel(nl80211, netdev->qos_map_cmd_id);
netdev->qos_map_cmd_id = 0;
}
if (netdev->mac_change_cmd_id) {
l_netlink_cancel(rtnl, netdev->mac_change_cmd_id);
netdev->mac_change_cmd_id = 0;
}
if (netdev->events_ready)
WATCHLIST_NOTIFY(&netdev_watches, netdev_watch_func_t,
netdev, NETDEV_WATCH_EVENT_DEL);
scan_wdev_remove(netdev->wdev_id);
watchlist_destroy(&netdev->station_watches);
l_io_destroy(netdev->pae_io);
l_free(netdev);
}
static void netdev_shutdown_one(void *data, void *user_data)
{
struct netdev *netdev = data;
if (netdev_get_is_up(netdev))
l_rtnl_set_powered(rtnl, netdev->index, false,
NULL, NULL, NULL);
}
static bool netdev_match(const void *a, const void *b)
{
const struct netdev *netdev = a;
uint32_t ifindex = L_PTR_TO_UINT(b);
return (netdev->index == ifindex);
}
struct netdev *netdev_find(int ifindex)
{
return l_queue_find(netdev_list, netdev_match, L_UINT_TO_PTR(ifindex));
}
static void netdev_lost_beacon(struct netdev *netdev)
{
if (!netdev->connected)
return;
if (netdev->event_filter)
netdev->event_filter(netdev, NETDEV_EVENT_LOST_BEACON, NULL,
netdev->user_data);
}
/* Threshold RSSI for roaming to trigger, configurable in main.conf */
static int LOW_SIGNAL_THRESHOLD;
static void netdev_cqm_event_rssi_threshold(struct netdev *netdev,
uint32_t rssi_event)
{
int event;
if (!netdev->operational)
return;
if (rssi_event != NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW &&
rssi_event != NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH)
return;
if (!netdev->event_filter)
return;
netdev->cur_rssi_low =
(rssi_event == NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW);
event = netdev->cur_rssi_low ? NETDEV_EVENT_RSSI_THRESHOLD_LOW :
NETDEV_EVENT_RSSI_THRESHOLD_HIGH;
netdev->event_filter(netdev, event, NULL, netdev->user_data);
}
static void netdev_rssi_level_init(struct netdev *netdev)
{
if (netdev->connected && netdev->rssi_levels_num)
netdev_set_rssi_level_idx(netdev);
}
static void netdev_cqm_event_rssi_value(struct netdev *netdev, int rssi_val)
{
bool new_rssi_low;
uint8_t prev_rssi_level_idx = netdev->cur_rssi_level_idx;
if (!netdev->connected)
return;
if (rssi_val > 127)
rssi_val = 127;
else if (rssi_val < -127)
rssi_val = -127;
netdev->cur_rssi = rssi_val;
if (!netdev->event_filter)
return;
new_rssi_low = rssi_val < LOW_SIGNAL_THRESHOLD;
if (netdev->cur_rssi_low != new_rssi_low) {
int event = new_rssi_low ?
NETDEV_EVENT_RSSI_THRESHOLD_LOW :
NETDEV_EVENT_RSSI_THRESHOLD_HIGH;
netdev->cur_rssi_low = new_rssi_low;
netdev->event_filter(netdev, event, NULL, netdev->user_data);
}
if (!netdev->rssi_levels_num)
return;
netdev_set_rssi_level_idx(netdev);
if (netdev->cur_rssi_level_idx != prev_rssi_level_idx)
netdev->event_filter(netdev, NETDEV_EVENT_RSSI_LEVEL_NOTIFY,
&netdev->cur_rssi_level_idx,
netdev->user_data);
}
static void netdev_cqm_event(struct l_genl_msg *msg, struct netdev *netdev)
{
struct l_genl_attr attr;
struct l_genl_attr nested;
uint16_t type, len;
const void *data;
uint32_t *rssi_event = NULL;
int32_t *rssi_val = NULL;
if (!l_genl_attr_init(&attr, msg))
return;
while (l_genl_attr_next(&attr, &type, &len, &data)) {
switch (type) {
case NL80211_ATTR_CQM:
if (!l_genl_attr_recurse(&attr, &nested))
return;
while (l_genl_attr_next(&nested, &type, &len, &data)) {
switch (type) {
case NL80211_ATTR_CQM_BEACON_LOSS_EVENT:
netdev_lost_beacon(netdev);
break;
case NL80211_ATTR_CQM_RSSI_THRESHOLD_EVENT:
if (len != 4)
continue;
rssi_event = (uint32_t *) data;
break;
case NL80211_ATTR_CQM_RSSI_LEVEL:
if (len != 4)
continue;
rssi_val = (int32_t *) data;
break;
}
}
break;
}
}
if (rssi_event) {
if (rssi_val)
netdev_cqm_event_rssi_value(netdev, *rssi_val);
else
netdev_cqm_event_rssi_threshold(netdev, *rssi_event);
}
}
static void netdev_rekey_offload_event(struct l_genl_msg *msg,
struct netdev *netdev)
{
struct l_genl_attr attr;
struct l_genl_attr nested;
uint16_t type, len;
const void *data;
uint64_t replay_ctr;
if (!l_genl_attr_init(&attr, msg))
return;
while (l_genl_attr_next(&attr, &type, &len, &data)) {
if (type != NL80211_ATTR_REKEY_DATA)
continue;
if (!l_genl_attr_recurse(&attr, &nested))
return;
while (l_genl_attr_next(&nested, &type, &len, &data)) {
if (type != NL80211_REKEY_DATA_REPLAY_CTR)
continue;
if (len != sizeof(uint64_t)) {
l_warn("Invalid replay_ctr");
return;
}
replay_ctr = *((uint64_t *) data);
__eapol_update_replay_counter(netdev->index,
netdev->addr,
netdev->handshake->aa,
replay_ctr);
return;
}
}
}
static void netdev_disconnect_event(struct l_genl_msg *msg,
struct netdev *netdev)
{
struct l_genl_attr attr;
uint16_t type, len;
const void *data;
uint16_t reason_code = 0;
bool disconnect_by_ap = false;
netdev_event_func_t event_filter;
void *event_data;
l_debug("");
if (!netdev->connected || netdev->disconnect_cmd_id > 0 ||
netdev->in_ft)
return;
if (!l_genl_attr_init(&attr, msg)) {
l_error("attr init failed");
return;
}
while (l_genl_attr_next(&attr, &type, &len, &data)) {
switch (type) {
case NL80211_ATTR_REASON_CODE:
if (len != sizeof(uint16_t))
l_warn("Invalid reason code attribute");
else
reason_code = *((uint16_t *) data);
break;
case NL80211_ATTR_DISCONNECTED_BY_AP:
disconnect_by_ap = true;
break;
}
}
l_info("Received Deauthentication event, reason: %hu, from_ap: %s",
reason_code, disconnect_by_ap ? "true" : "false");
event_filter = netdev->event_filter;
event_data = netdev->user_data;
netdev_connect_free(netdev);
if (!event_filter)
return;
if (disconnect_by_ap)
event_filter(netdev, NETDEV_EVENT_DISCONNECT_BY_AP,
&reason_code, event_data);
else
event_filter(netdev, NETDEV_EVENT_DISCONNECT_BY_SME,
&reason_code, event_data);
}
static void netdev_cmd_disconnect_cb(struct l_genl_msg *msg, void *user_data)
{
struct netdev *netdev = user_data;
void *disconnect_data;
netdev_disconnect_cb_t disconnect_cb;
bool r;
netdev->disconnect_cmd_id = 0;
netdev->aborting = false;
if (!netdev->disconnect_cb) {
netdev->user_data = NULL;
return;
}
disconnect_data = netdev->user_data;
disconnect_cb = netdev->disconnect_cb;
netdev->user_data = NULL;
netdev->disconnect_cb = NULL;
if (l_genl_msg_get_error(msg) < 0)
r = false;
else
r = true;
disconnect_cb(netdev, r, disconnect_data);
}
static struct l_genl_msg *netdev_build_cmd_disconnect(struct netdev *netdev,
uint16_t reason_code)
{
struct l_genl_msg *msg;
msg = l_genl_msg_new_sized(NL80211_CMD_DISCONNECT, 64);
l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &netdev->index);
l_genl_msg_append_attr(msg, NL80211_ATTR_REASON_CODE, 2, &reason_code);
return msg;
}
static void netdev_deauthenticate_event(struct l_genl_msg *msg,
struct netdev *netdev)
{
l_debug("");
}
static struct l_genl_msg *netdev_build_cmd_deauthenticate(struct netdev *netdev,
uint16_t reason_code)
{
struct l_genl_msg *msg;
msg = l_genl_msg_new_sized(NL80211_CMD_DEAUTHENTICATE, 128);
l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &netdev->index);
l_genl_msg_append_attr(msg, NL80211_ATTR_REASON_CODE, 2, &reason_code);
l_genl_msg_append_attr(msg, NL80211_ATTR_MAC, ETH_ALEN,
netdev->handshake->aa);
return msg;
}
static struct l_genl_msg *netdev_build_cmd_del_station(struct netdev *netdev,
const uint8_t *sta,
uint16_t reason_code,
bool disassociate)
{
struct l_genl_msg *msg;
uint8_t subtype = disassociate ?
MPDU_MANAGEMENT_SUBTYPE_DISASSOCIATION :
MPDU_MANAGEMENT_SUBTYPE_DEAUTHENTICATION;
msg = l_genl_msg_new_sized(NL80211_CMD_DEL_STATION, 64);
l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &netdev->index);
l_genl_msg_append_attr(msg, NL80211_ATTR_MAC, 6, sta);
l_genl_msg_append_attr(msg, NL80211_ATTR_MGMT_SUBTYPE, 1, &subtype);
l_genl_msg_append_attr(msg, NL80211_ATTR_REASON_CODE, 2, &reason_code);
return msg;
}
static void netdev_del_sta_cb(struct l_genl_msg *msg, void *user_data)
{
int err = l_genl_msg_get_error(msg);
const char *ext_error;
if (err >= 0)
return;
ext_error = l_genl_msg_get_extended_error(msg);
l_error("DEL_STATION failed: %s",
ext_error ? ext_error : strerror(-err));
}
int netdev_del_station(struct netdev *netdev, const uint8_t *sta,
uint16_t reason_code, bool disassociate)
{
struct l_genl_msg *msg;
msg = netdev_build_cmd_del_station(netdev, sta, reason_code,
disassociate);
if (!l_genl_family_send(nl80211, msg, netdev_del_sta_cb, NULL, NULL))
return -EIO;
return 0;
}
static void netdev_operstate_cb(int error, uint16_t type,
const void *data,
uint32_t len, void *user_data)
{
if (!error)
return;
l_debug("netdev: %u, error: %s", L_PTR_TO_UINT(user_data),
strerror(-error));
}
static void netdev_connect_ok(struct netdev *netdev)
{
l_rtnl_set_linkmode_and_operstate(rtnl, netdev->index,
IF_LINK_MODE_DORMANT, IF_OPER_UP,
netdev_operstate_cb,
L_UINT_TO_PTR(netdev->index), NULL);
netdev->operational = true;
if (netdev->connect_cb) {
netdev->connect_cb(netdev, NETDEV_RESULT_OK, NULL,
netdev->user_data);
netdev->connect_cb = NULL;
}
netdev_rssi_polling_update(netdev);
}
static void netdev_setting_keys_failed(struct netdev_handshake_state *nhs,
int err)
{
struct netdev *netdev = nhs->netdev;
struct l_genl_msg *msg;
/*
* Something went wrong with our sequence:
* 1. new_key(ptk)
* 2. new_key(gtk) [optional]
* 3. new_key(igtk) [optional]
* 4. rekey offload [optional]
* 5. set_station
*
* Cancel all pending commands, then de-authenticate
*/
netdev_handshake_state_cancel_all(nhs);
if (netdev->rekey_offload_cmd_id) {
l_genl_family_cancel(nl80211, netdev->rekey_offload_cmd_id);
netdev->rekey_offload_cmd_id = 0;
}
if (netdev->group_handshake_timeout) {
l_timeout_remove(netdev->group_handshake_timeout);
netdev->group_handshake_timeout = NULL;
}
netdev->result = NETDEV_RESULT_KEY_SETTING_FAILED;
handshake_event(&nhs->super, HANDSHAKE_EVENT_SETTING_KEYS_FAILED, &err);
switch (netdev->type) {
case NL80211_IFTYPE_STATION:
case NL80211_IFTYPE_P2P_CLIENT:
msg = netdev_build_cmd_disconnect(netdev,
MMPDU_REASON_CODE_UNSPECIFIED);
netdev->disconnect_cmd_id = l_genl_family_send(nl80211, msg,
netdev_disconnect_cb,
netdev, NULL);
break;
case NL80211_IFTYPE_AP:
msg = netdev_build_cmd_del_station(netdev, nhs->super.spa,
MMPDU_REASON_CODE_UNSPECIFIED, false);
if (!l_genl_family_send(nl80211, msg, NULL, NULL, NULL))
l_error("error sending DEL_STATION");
}
}
static void try_handshake_complete(struct netdev_handshake_state *nhs)
{
if (nhs->ptk_installed && nhs->gtk_installed && nhs->igtk_installed &&
!nhs->complete) {
nhs->complete = true;
handshake_event(&nhs->super, HANDSHAKE_EVENT_COMPLETE);
netdev_connect_ok(nhs->netdev);
}
}
static void netdev_set_station_cb(struct l_genl_msg *msg, void *user_data)
{
struct netdev_handshake_state *nhs = user_data;
struct netdev *netdev = nhs->netdev;
int err;
nhs->set_station_cmd_id = 0;
nhs->ptk_installed = true;
if (netdev->type == NL80211_IFTYPE_STATION && !netdev->connected)
return;
err = l_genl_msg_get_error(msg);
if (err == -EOPNOTSUPP || err == -ENOTSUPP)
goto done;
if (err < 0) {
const char *ext_error = l_genl_msg_get_extended_error(msg);
l_error("Set Station failed for ifindex %d:%s", netdev->index,
ext_error ? ext_error : strerror(-err));
netdev_setting_keys_failed(nhs, err);
return;
}
done:
try_handshake_complete(nhs);
}
static void netdev_new_group_key_cb(struct l_genl_msg *msg, void *data)
{
struct netdev_handshake_state *nhs = data;
struct netdev *netdev = nhs->netdev;
int err = l_genl_msg_get_error(msg);
nhs->group_new_key_cmd_id = 0;
if (err < 0) {
const char *ext_error = l_genl_msg_get_extended_error(msg);
l_error("New Key for Group Key failed for ifindex: %d:%s",
netdev->index,
ext_error ? ext_error : strerror(-err));
netdev_setting_keys_failed(nhs, err);
return;
}
nhs->gtk_installed = true;
try_handshake_complete(nhs);
}
static void netdev_new_group_management_key_cb(struct l_genl_msg *msg,
void *data)
{
struct netdev_handshake_state *nhs = data;
struct netdev *netdev = nhs->netdev;
int err = l_genl_msg_get_error(msg);
nhs->group_management_new_key_cmd_id = 0;
if (err < 0) {
const char *ext_error = l_genl_msg_get_extended_error(msg);
l_error("New Key for Group Mgmt failed for ifindex: %d:%s",
netdev->index,
ext_error ? ext_error : strerror(-err));
netdev_setting_keys_failed(nhs, err);
return;
}
nhs->igtk_installed = true;
try_handshake_complete(nhs);
}
static bool netdev_copy_tk(uint8_t *tk_buf, const uint8_t *tk,
uint32_t cipher, bool authenticator)
{
switch (cipher) {
case CRYPTO_CIPHER_CCMP:
/*
* 802.11-2016 12.8.3 Mapping PTK to CCMP keys:
* "A STA shall use the temporal key as the CCMP key
* for MPDUs between the two communicating STAs."
*/
memcpy(tk_buf, tk, 16);
break;
case CRYPTO_CIPHER_TKIP:
/*
* 802.11-2016 12.8.1 Mapping PTK to TKIP keys:
* "A STA shall use bits 0-127 of the temporal key as its
* input to the TKIP Phase 1 and Phase 2 mixing functions.
*
* A STA shall use bits 128-191 of the temporal key as
* the michael key for MSDUs from the Authenticator's STA
* to the Supplicant's STA.
*
* A STA shall use bits 192-255 of the temporal key as
* the michael key for MSDUs from the Supplicant's STA
* to the Authenticator's STA."
*/
if (authenticator) {
memcpy(tk_buf + NL80211_TKIP_DATA_OFFSET_ENCR_KEY,
tk, 16);
memcpy(tk_buf + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY,
tk + 16, 8);
memcpy(tk_buf + NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY,
tk + 24, 8);
} else {
memcpy(tk_buf + NL80211_TKIP_DATA_OFFSET_ENCR_KEY,
tk, 16);
memcpy(tk_buf + NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY,
tk + 16, 8);
memcpy(tk_buf + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY,
tk + 24, 8);
}
break;
default:
l_error("Unexpected cipher: %x", cipher);
return false;
}
return true;
}
static const uint8_t *netdev_choose_key_address(
struct netdev_handshake_state *nhs)
{
return (nhs->super.authenticator) ? nhs->super.spa : nhs->super.aa;
}
static void netdev_set_gtk(struct handshake_state *hs, uint16_t key_index,
const uint8_t *gtk, uint8_t gtk_len,
const uint8_t *rsc, uint8_t rsc_len,
uint32_t cipher)
{
struct netdev_handshake_state *nhs =
l_container_of(hs, struct netdev_handshake_state, super);
struct netdev *netdev = nhs->netdev;
uint8_t gtk_buf[32];
struct l_genl_msg *msg;
const uint8_t *addr = (netdev->type == NL80211_IFTYPE_ADHOC) ?
nhs->super.aa : NULL;
nhs->gtk_installed = false;
l_debug("%d", netdev->index);
if (crypto_cipher_key_len(cipher) != gtk_len) {
l_error("Unexpected key length: %d", gtk_len);
netdev_setting_keys_failed(nhs, -ERANGE);
return;
}
if (!netdev_copy_tk(gtk_buf, gtk, cipher, false)) {
netdev_setting_keys_failed(nhs, -ENOENT);
return;
}
if (hs->wait_for_gtk) {
l_timeout_remove(netdev->group_handshake_timeout);
netdev->group_handshake_timeout = NULL;
}
msg = nl80211_build_new_key_group(netdev->index, cipher, key_index,
gtk_buf, gtk_len, rsc, rsc_len, addr);
nhs->group_new_key_cmd_id =
l_genl_family_send(nl80211, msg, netdev_new_group_key_cb,
nhs, NULL);
if (nhs->group_new_key_cmd_id > 0)
return;
l_genl_msg_unref(msg);
netdev_setting_keys_failed(nhs, -EIO);
}
static void netdev_set_igtk(struct handshake_state *hs, uint16_t key_index,
const uint8_t *igtk, uint8_t igtk_len,
const uint8_t *ipn, uint8_t ipn_len,
uint32_t cipher)
{
struct netdev_handshake_state *nhs =
l_container_of(hs, struct netdev_handshake_state, super);
uint8_t igtk_buf[16];
struct netdev *netdev = nhs->netdev;
struct l_genl_msg *msg;
nhs->igtk_installed = false;
l_debug("%d", netdev->index);
if (crypto_cipher_key_len(cipher) != igtk_len) {
l_error("Unexpected key length: %d", igtk_len);
netdev_setting_keys_failed(nhs, -ERANGE);
return;
}
switch (cipher) {
case CRYPTO_CIPHER_BIP:
memcpy(igtk_buf, igtk, 16);
break;
default:
l_error("Unexpected cipher: %x", cipher);
netdev_setting_keys_failed(nhs, -ENOENT);
return;
}
if (key_index == 0x0400 || key_index == 0x0500) {
l_warn("Received an invalid IGTK key index (%04hx)"
" that is likely in"
" big endian format. Trying to fix and"
" proceed anyway", key_index);
key_index = bswap_16(key_index);
}
msg = nl80211_build_new_key_group(netdev->index, cipher, key_index,
igtk_buf, igtk_len, ipn, ipn_len, NULL);
nhs->group_management_new_key_cmd_id =
l_genl_family_send(nl80211, msg,
netdev_new_group_management_key_cb,
nhs, NULL);
if (nhs->group_management_new_key_cmd_id > 0)
return;
l_genl_msg_unref(msg);
netdev_setting_keys_failed(nhs, -EIO);
}
static void netdev_new_pairwise_key_cb(struct l_genl_msg *msg, void *data)
{
struct netdev_handshake_state *nhs = data;
struct netdev *netdev = nhs->netdev;
const uint8_t *addr = netdev_choose_key_address(nhs);
int err = l_genl_msg_get_error(msg);
nhs->pairwise_new_key_cmd_id = 0;
if (err < 0) {
const char *ext_error = l_genl_msg_get_extended_error(msg);
l_error("New Key for Pairwise Key failed for ifindex: %d:%s",
netdev->index,
ext_error ? ext_error : strerror(-err));
goto error;
}
/*
* Set the AUTHORIZED flag using a SET_STATION command even if
* we're already operational, it will not hurt during re-keying
* and is necessary after an FT.
*/
msg = nl80211_build_set_station_authorized(netdev->index, addr);
nhs->set_station_cmd_id =
l_genl_family_send(nl80211, msg, netdev_set_station_cb,
nhs, NULL);
if (nhs->set_station_cmd_id > 0)
return;
l_genl_msg_unref(msg);
err = -EIO;
error:
netdev_setting_keys_failed(nhs, err);
}
static struct l_genl_msg *netdev_build_cmd_new_key_pairwise(
struct netdev *netdev,
uint32_t cipher,
const uint8_t *aa,
const uint8_t *tk,
size_t tk_len)
{
uint8_t key_id = 0;
struct l_genl_msg *msg;
msg = l_genl_msg_new_sized(NL80211_CMD_NEW_KEY, 512);
l_genl_msg_append_attr(msg, NL80211_ATTR_KEY_DATA, tk_len, tk);
l_genl_msg_append_attr(msg, NL80211_ATTR_KEY_CIPHER, 4, &cipher);
l_genl_msg_append_attr(msg, NL80211_ATTR_MAC, ETH_ALEN, aa);
l_genl_msg_append_attr(msg, NL80211_ATTR_KEY_IDX, 1, &key_id);
l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &netdev->index);
return msg;
}
static void netdev_group_timeout_cb(struct l_timeout *timeout, void *user_data)
{
struct netdev_handshake_state *nhs = user_data;
/*
* There was a problem with the ptk, this should have triggered a key
* setting failure event already.
*/
if (!nhs->ptk_installed)
return;
/*
* If this happens, we never completed the group handshake. We can still
* complete the connection, but we will not have group traffic.
*/
l_warn("completing connection with no group traffic on ifindex %d",
nhs->netdev->index);
nhs->complete = true;
handshake_event(&nhs->super, HANDSHAKE_EVENT_COMPLETE);
netdev_connect_ok(nhs->netdev);
}
static void netdev_set_tk(struct handshake_state *hs,
const uint8_t *tk, uint32_t cipher)
{
struct netdev_handshake_state *nhs =
l_container_of(hs, struct netdev_handshake_state, super);
uint8_t tk_buf[32];
struct netdev *netdev = nhs->netdev;
struct l_genl_msg *msg;
const uint8_t *addr = netdev_choose_key_address(nhs);
int err;
/*
* WPA1 does the group handshake after the 4-way finishes so we can't
* rely on the gtk/igtk being set immediately after the ptk. Since
* 'gtk_installed' is initially set to true (to handle NO_GROUP_TRAFFIC)
* we must set it false so we don't notify that the connection was
* successful until we get the gtk/igtk callbacks. Note that we do not
* need to set igtk_installed false because the igtk could not happen at
* all.
*/
if (hs->wait_for_gtk) {
nhs->gtk_installed = false;
netdev->group_handshake_timeout = l_timeout_create(2,
netdev_group_timeout_cb, nhs, NULL);
}
/*
* 802.11 Section 4.10.4.3:
* Because in an IBSS there are two 4-way handshakes between
* any two Supplicants and Authenticators, the pairwise key used
* between any two STAs is from the 4-way handshake initiated
* by the STA Authenticator with the higher MAC address...
*/
if (netdev->type == NL80211_IFTYPE_ADHOC &&
memcmp(nhs->super.aa, nhs->super.spa, 6) < 0) {
nhs->ptk_installed = true;
try_handshake_complete(nhs);
return;
}
l_debug("%d", netdev->index);
err = -ENOENT;
if (!netdev_copy_tk(tk_buf, tk, cipher, false))
goto invalid_key;
msg = netdev_build_cmd_new_key_pairwise(netdev, cipher, addr, tk_buf,
crypto_cipher_key_len(cipher));
nhs->pairwise_new_key_cmd_id =
l_genl_family_send(nl80211, msg, netdev_new_pairwise_key_cb,
nhs, NULL);
if (nhs->pairwise_new_key_cmd_id > 0)
return;
err = -EIO;
l_genl_msg_unref(msg);
invalid_key:
netdev_setting_keys_failed(nhs, err);
}
void netdev_handshake_failed(struct handshake_state *hs, uint16_t reason_code)
{
struct netdev_handshake_state *nhs =
l_container_of(hs, struct netdev_handshake_state, super);
struct netdev *netdev = nhs->netdev;
struct l_genl_msg *msg;
l_error("4-Way handshake failed for ifindex: %d, reason: %u",
netdev->index, reason_code);
netdev->sm = NULL;
netdev->result = NETDEV_RESULT_HANDSHAKE_FAILED;
netdev->last_code = reason_code;
switch (netdev->type) {
case NL80211_IFTYPE_STATION:
case NL80211_IFTYPE_P2P_CLIENT:
msg = netdev_build_cmd_disconnect(netdev, reason_code);
netdev->disconnect_cmd_id = l_genl_family_send(nl80211, msg,
netdev_disconnect_cb,
netdev, NULL);
break;
case NL80211_IFTYPE_AP:
case NL80211_IFTYPE_P2P_GO:
msg = netdev_build_cmd_del_station(netdev, nhs->super.spa,
reason_code, false);
if (!l_genl_family_send(nl80211, msg, NULL, NULL, NULL))
l_error("error sending DEL_STATION");
}
}
static void hardware_rekey_cb(struct l_genl_msg *msg, void *data)
{
struct netdev *netdev = data;
int err;
netdev->rekey_offload_cmd_id = 0;
err = l_genl_msg_get_error(msg);
if (err < 0) {
if (err == -EOPNOTSUPP) {
l_error("hardware_rekey not supported");
netdev->rekey_offload_support = false;
}
/*
* TODO: Ignore all other errors for now, until WoWLAN is
* supported properly
*/
}
}
static struct l_genl_msg *netdev_build_cmd_replay_counter(struct netdev *netdev,
const uint8_t *kek,
const uint8_t *kck,
uint64_t replay_ctr)
{
struct l_genl_msg *msg;
msg = l_genl_msg_new_sized(NL80211_CMD_SET_REKEY_OFFLOAD, 512);
l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &netdev->index);
l_genl_msg_enter_nested(msg, NL80211_ATTR_REKEY_DATA);
l_genl_msg_append_attr(msg, NL80211_REKEY_DATA_KEK,
NL80211_KEK_LEN, kek);
l_genl_msg_append_attr(msg, NL80211_REKEY_DATA_KCK,
NL80211_KCK_LEN, kck);
l_genl_msg_append_attr(msg, NL80211_REKEY_DATA_REPLAY_CTR,
NL80211_REPLAY_CTR_LEN, &replay_ctr);
l_genl_msg_leave_nested(msg);
return msg;
}
static void netdev_set_rekey_offload(uint32_t ifindex,
const uint8_t *kek,
const uint8_t *kck,
uint64_t replay_counter,
void *user_data)
{
struct netdev *netdev;
struct l_genl_msg *msg;
netdev = netdev_find(ifindex);
if (!netdev)
return;
if (netdev->type != NL80211_IFTYPE_STATION)
return;
if (!netdev->rekey_offload_support)
return;
l_debug("%d", netdev->index);
msg = netdev_build_cmd_replay_counter(netdev, kek, kck, replay_counter);
netdev->rekey_offload_cmd_id = l_genl_family_send(nl80211, msg,
hardware_rekey_cb,
netdev, NULL);
}
static void netdev_qos_map_cb(struct l_genl_msg *msg, void *user_data)
{
struct netdev *netdev = user_data;
int err = l_genl_msg_get_error(msg);
const char *ext_error;
netdev->qos_map_cmd_id = 0;
if (err >= 0)
return;
ext_error = l_genl_msg_get_extended_error(msg);
l_error("Couuld not set QoS Map in kernel: %s",
ext_error ? ext_error : strerror(-err));
}
/*
* TODO: Fix this in the kernel:
*
* The QoS Map is really of no use to IWD. The kernel requires it to map QoS
* network values properly to what it puts into the IP header. The way we have
* to let the kernel know is to receive the IE, then give it right back...
*
* The kernel/driver/firmware *could* simply obtain this information as the
* frame comes in and not require userspace to forward it back... but that's a
* battle for another day.
*/
static void netdev_send_qos_map_set(struct netdev *netdev,
const uint8_t *qos_set, size_t qos_len)
{
struct l_genl_msg *msg;
if (!wiphy_supports_qos_set_map(netdev->wiphy)) {
l_warn("AP sent QoS Map, but capability was not advertised!");
return;
}
/*
* Since this IE comes in on either a management frame or during
* Association response we could have potentially already set this.
*/
if (netdev->qos_map_cmd_id)
return;
msg = l_genl_msg_new_sized(NL80211_CMD_SET_QOS_MAP, 128 + qos_len);
l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &netdev->index);
l_genl_msg_append_attr(msg, NL80211_ATTR_QOS_MAP, qos_len, qos_set);
netdev->qos_map_cmd_id = l_genl_family_send(nl80211, msg,
netdev_qos_map_cb,
netdev, NULL);
}
static void netdev_connect_event(struct l_genl_msg *msg, struct netdev *netdev)
{
struct l_genl_attr attr;
uint16_t type, len;
const void *data;
const uint16_t *status_code = NULL;
const uint8_t *ies = NULL;
size_t ies_len = 0;
struct ie_tlv_iter iter;
const uint8_t *resp_ies = NULL;
size_t resp_ies_len;
l_debug("");
if (netdev->aborting)
return;
if (netdev->ignore_connect_event)
return;
if (!netdev->connected) {
l_warn("Unexpected connection related event -- "
"is another supplicant running?");
return;
}
if (!l_genl_attr_init(&attr, msg)) {
l_debug("attr init failed");
goto error;
}
while (l_genl_attr_next(&attr, &type, &len, &data)) {
switch (type) {
case NL80211_ATTR_TIMED_OUT:
l_warn("authentication timed out");
goto error;
case NL80211_ATTR_STATUS_CODE:
if (len == sizeof(uint16_t))
status_code = data;
break;
case NL80211_ATTR_REQ_IE:
ies = data;
ies_len = len;
break;
case NL80211_ATTR_RESP_IE:
resp_ies = data;
resp_ies_len = len;
break;
}
}
if (netdev->expect_connect_failure) {
/*
* The kernel may think we are connected when we are actually
* expecting a failure here, e.g. if Authenticate/Associate had
* previously failed. If so we need to deauth to let the kernel
* know.
*/
if (status_code && *status_code == 0)
goto deauth;
else
goto error;
}
/* AP Rejected the authenticate / associate */
if (!status_code || *status_code != 0)
goto error;
if (!ies)
goto process_resp_ies;
/*
* The driver may have modified the IEs we passed to CMD_CONNECT
* before sending them out, the actual IE sent is reflected in the
* ATTR_REQ_IE sequence. These are the values EAPoL will need to use.
*/
ie_tlv_iter_init(&iter, ies, ies_len);
while (ie_tlv_iter_next(&iter)) {
data = ie_tlv_iter_get_data(&iter);
switch (ie_tlv_iter_get_tag(&iter)) {
case IE_TYPE_RSN:
handshake_state_set_supplicant_ie(netdev->handshake,
data - 2);
break;
case IE_TYPE_VENDOR_SPECIFIC:
if (!is_ie_wpa_ie(data, ie_tlv_iter_get_length(&iter)))
break;
handshake_state_set_supplicant_ie(netdev->handshake,
data - 2);
break;
case IE_TYPE_MOBILITY_DOMAIN:
handshake_state_set_mde(netdev->handshake, data - 2);
break;
}
}
process_resp_ies:
if (resp_ies) {
const uint8_t *fte = NULL;
const uint8_t *qos_set = NULL;
size_t qos_len = 0;
struct ie_ft_info ft_info;
ie_tlv_iter_init(&iter, resp_ies, resp_ies_len);
while (ie_tlv_iter_next(&iter)) {
data = ie_tlv_iter_get_data(&iter);
switch (ie_tlv_iter_get_tag(&iter)) {
case IE_TYPE_FAST_BSS_TRANSITION:
fte = data - 2;
break;
case IE_TYPE_QOS_MAP_SET:
qos_set = data;
qos_len = ie_tlv_iter_get_length(&iter);
break;
}
}
/* FILS handles its own FT key derivation */
if (fte && !(netdev->handshake->akm_suite &
(IE_RSN_AKM_SUITE_FT_OVER_FILS_SHA256 |
IE_RSN_AKM_SUITE_FT_OVER_FILS_SHA384))) {
uint32_t kck_len =
handshake_state_get_kck_len(netdev->handshake);
/*
* If we are here, then most likely we have a FullMac
* hw performing initial mobility association. We need
* to set the FTE element or the handshake will fail
* The firmware accepted the FTE element, so do not
* sanitize the contents and just assume they're okay.
*/
if (ie_parse_fast_bss_transition_from_data(fte,
fte[1] + 2, kck_len, &ft_info) >= 0) {
handshake_state_set_fte(netdev->handshake, fte);
handshake_state_set_kh_ids(netdev->handshake,
ft_info.r0khid,
ft_info.r0khid_len,
ft_info.r1khid);
} else {
l_info("CMD_CONNECT Succeeded, but parsing FTE"
" failed. Expect handshake failure");
}
}
if (qos_set)
netdev_send_qos_map_set(netdev, qos_set, qos_len);
}
if (netdev->sm) {
/*
* Start processing EAPoL frames now that the state machine
* has all the input data even in FT mode.
*/
if (!eapol_start(netdev->sm))
goto error;
return;
}
netdev_connect_ok(netdev);
return;
error:
netdev_connect_failed(netdev, NETDEV_RESULT_ASSOCIATION_FAILED,
(status_code) ? *status_code :
MMPDU_STATUS_CODE_UNSPECIFIED);
return;
deauth:
msg = netdev_build_cmd_deauthenticate(netdev,
MMPDU_REASON_CODE_UNSPECIFIED);
netdev->disconnect_cmd_id = l_genl_family_send(nl80211,
msg,
netdev_disconnect_cb,
netdev, NULL);
}
static unsigned int ie_rsn_akm_suite_to_nl80211(enum ie_rsn_akm_suite akm)
{
switch (akm) {
case IE_RSN_AKM_SUITE_8021X:
return CRYPTO_AKM_8021X;
case IE_RSN_AKM_SUITE_PSK:
return CRYPTO_AKM_PSK;
case IE_RSN_AKM_SUITE_FT_OVER_8021X:
return CRYPTO_AKM_FT_OVER_8021X;
case IE_RSN_AKM_SUITE_FT_USING_PSK:
return CRYPTO_AKM_FT_USING_PSK;
case IE_RSN_AKM_SUITE_8021X_SHA256:
return CRYPTO_AKM_8021X_SHA256;
case IE_RSN_AKM_SUITE_PSK_SHA256:
return CRYPTO_AKM_PSK_SHA256;
case IE_RSN_AKM_SUITE_TDLS:
return CRYPTO_AKM_TDLS;
case IE_RSN_AKM_SUITE_SAE_SHA256:
return CRYPTO_AKM_SAE_SHA256;
case IE_RSN_AKM_SUITE_FT_OVER_SAE_SHA256:
return CRYPTO_AKM_FT_OVER_SAE_SHA256;
case IE_RSN_AKM_SUITE_AP_PEER_KEY_SHA256:
return CRYPTO_AKM_AP_PEER_KEY_SHA256;
case IE_RSN_AKM_SUITE_8021X_SUITE_B_SHA256:
return CRYPTO_AKM_8021X_SUITE_B_SHA256;
case IE_RSN_AKM_SUITE_8021X_SUITE_B_SHA384:
return CRYPTO_AKM_8021X_SUITE_B_SHA384;
case IE_RSN_AKM_SUITE_FT_OVER_8021X_SHA384:
return CRYPTO_AKM_FT_OVER_8021X_SHA384;
case IE_RSN_AKM_SUITE_FILS_SHA256:
return CRYPTO_AKM_FILS_SHA256;
case IE_RSN_AKM_SUITE_FILS_SHA384:
return CRYPTO_AKM_FILS_SHA384;
case IE_RSN_AKM_SUITE_FT_OVER_FILS_SHA256:
return CRYPTO_AKM_FT_OVER_FILS_SHA256;
case IE_RSN_AKM_SUITE_FT_OVER_FILS_SHA384:
return CRYPTO_AKM_FT_OVER_FILS_SHA384;
case IE_RSN_AKM_SUITE_OWE:
return CRYPTO_AKM_OWE;
case IE_RSN_AKM_SUITE_OSEN:
return CRYPTO_AKM_OSEN;
}
return 0;
}
static struct l_genl_msg *netdev_build_cmd_associate_common(
struct netdev *netdev)
{
struct handshake_state *hs = netdev->handshake;
bool is_rsn = hs->supplicant_ie != NULL;
struct l_genl_msg *msg;
msg = l_genl_msg_new_sized(NL80211_CMD_ASSOCIATE, 600);
l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &netdev->index);
l_genl_msg_append_attr(msg, NL80211_ATTR_WIPHY_FREQ, 4,
&netdev->frequency);
l_genl_msg_append_attr(msg, NL80211_ATTR_MAC, ETH_ALEN, hs->aa);
l_genl_msg_append_attr(msg, NL80211_ATTR_SSID, hs->ssid_len, hs->ssid);
l_genl_msg_append_attr(msg, NL80211_ATTR_SOCKET_OWNER, 0, NULL);
if (is_rsn) {
uint32_t nl_cipher;
uint32_t nl_akm;
uint32_t wpa_version;
l_genl_msg_append_attr(msg, NL80211_ATTR_CONTROL_PORT, 0, NULL);
if (netdev->pae_over_nl80211)
l_genl_msg_append_attr(msg,
NL80211_ATTR_CONTROL_PORT_OVER_NL80211,
0, NULL);
if (hs->pairwise_cipher == IE_RSN_CIPHER_SUITE_CCMP)
nl_cipher = CRYPTO_CIPHER_CCMP;
else
nl_cipher = CRYPTO_CIPHER_TKIP;
l_genl_msg_append_attr(msg, NL80211_ATTR_CIPHER_SUITES_PAIRWISE,
4, &nl_cipher);
if (hs->group_cipher == IE_RSN_CIPHER_SUITE_CCMP)
nl_cipher = CRYPTO_CIPHER_CCMP;
else
nl_cipher = CRYPTO_CIPHER_TKIP;
l_genl_msg_append_attr(msg, NL80211_ATTR_CIPHER_SUITE_GROUP,
4, &nl_cipher);
if (hs->mfp) {
uint32_t use_mfp = NL80211_MFP_REQUIRED;
l_genl_msg_append_attr(msg, NL80211_ATTR_USE_MFP,
4, &use_mfp);
}
nl_akm = ie_rsn_akm_suite_to_nl80211(hs->akm_suite);
if (nl_akm)
l_genl_msg_append_attr(msg, NL80211_ATTR_AKM_SUITES,
4, &nl_akm);
if (hs->wpa_ie)
wpa_version = NL80211_WPA_VERSION_1;
else
wpa_version = NL80211_WPA_VERSION_2;
l_genl_msg_append_attr(msg, NL80211_ATTR_WPA_VERSIONS,
4, &wpa_version);
}
return msg;
}
static void netdev_cmd_ft_reassociate_cb(struct l_genl_msg *msg,
void *user_data)
{
struct netdev *netdev = user_data;
netdev->connect_cmd_id = 0;
if (l_genl_msg_get_error(msg) < 0) {
struct l_genl_msg *cmd_deauth;
netdev->result = NETDEV_RESULT_ASSOCIATION_FAILED;
netdev->last_code = MMPDU_STATUS_CODE_UNSPECIFIED;
cmd_deauth = netdev_build_cmd_deauthenticate(netdev,
MMPDU_REASON_CODE_UNSPECIFIED);
netdev->disconnect_cmd_id = l_genl_family_send(nl80211,
cmd_deauth,
netdev_disconnect_cb,
netdev, NULL);
}
}
static void netdev_authenticate_event(struct l_genl_msg *msg,
struct netdev *netdev)
{
struct l_genl_attr attr;
uint16_t type, len;
const void *data;
const uint8_t *frame = NULL;
size_t frame_len = 0;
int ret;
uint16_t status_code = MMPDU_STATUS_CODE_UNSPECIFIED;
l_debug("");
if (netdev->aborting)
return;
if (!netdev->connected) {
l_warn("Unexpected connection related event -- "
"is another supplicant running?");
return;
}
/*
* During Fast Transition we use the authenticate event to start the
* reassociation step because the FTE necessary before we can build
* the FT Associate command is included in the attached frame and is
* not available in the Authenticate command callback.
*/
if (!netdev->ap)
return;
if (!l_genl_attr_init(&attr, msg)) {
l_debug("attr init failed");
goto auth_error;
}
while (l_genl_attr_next(&attr, &type, &len, &data)) {
switch (type) {
case NL80211_ATTR_TIMED_OUT:
l_warn("authentication timed out");
if (auth_proto_auth_timeout(netdev->ap))
return;
goto auth_error;
case NL80211_ATTR_FRAME:
if (frame)
goto auth_error;
frame = data;
frame_len = len;
break;
}
}
if (!frame)
goto auth_error;
if (netdev->ap) {
ret = auth_proto_rx_authenticate(netdev->ap, frame, frame_len);
if (ret == 0 || ret == -EAGAIN)
return;
else if (ret > 0)
status_code = (uint16_t)ret;
goto auth_error;
} else
goto auth_error;
return;
auth_error:
netdev_connect_failed(netdev, NETDEV_RESULT_AUTHENTICATION_FAILED,
status_code);
}
static void netdev_associate_event(struct l_genl_msg *msg,
struct netdev *netdev)
{
struct l_genl_attr attr;
uint16_t type, len;
const void *data;
size_t frame_len = 0;
const uint8_t *frame = NULL;
uint16_t status_code = MMPDU_STATUS_CODE_UNSPECIFIED;
int ret;
l_debug("");
if (!netdev->connected || netdev->aborting)
return;
if (!netdev->ap)
return;
if (!l_genl_attr_init(&attr, msg)) {
l_debug("attr init failed");
return;
}
while (l_genl_attr_next(&attr, &type, &len, &data)) {
switch (type) {
case NL80211_ATTR_TIMED_OUT:
l_warn("association timed out");
if (auth_proto_assoc_timeout(netdev->ap))
return;
goto assoc_failed;
case NL80211_ATTR_FRAME:
frame = data;
frame_len = len;
break;
}
}
if (!frame)
goto assoc_failed;
if (netdev->ap) {
ret = auth_proto_rx_associate(netdev->ap, frame, frame_len);
if (ret == 0) {
auth_proto_free(netdev->ap);
netdev->ap = NULL;
netdev->sm = eapol_sm_new(netdev->handshake);
eapol_register(netdev->sm);
/* Just in case this was a retry */
netdev->ignore_connect_event = false;
/*
* If in FT we need to prevent the 4-way handshake from
* happening, and instead just wait for rekeys
*/
if (netdev->in_ft) {
eapol_sm_set_require_handshake(netdev->sm,
false);
netdev->in_ft = false;
}
return;
} else if (ret == -EAGAIN) {
/*
* Here to support OWE retries. OWE will retry
* internally, but a connect even will still be emitted.
*/
netdev->ignore_connect_event = true;
return;
} else if (ret > 0)
status_code = (uint16_t)ret;
goto assoc_failed;
}
return;
assoc_failed:
netdev->result = NETDEV_RESULT_ASSOCIATION_FAILED;
netdev->last_code = status_code;
netdev->expect_connect_failure = true;
}
static void netdev_cmd_connect_cb(struct l_genl_msg *msg, void *user_data)
{
struct netdev *netdev = user_data;
netdev->connect_cmd_id = 0;
/* Wait for connect event */
if (l_genl_msg_get_error(msg) >= 0) {
netdev->connected = true;
if (netdev->event_filter)
netdev->event_filter(netdev,
NETDEV_EVENT_ASSOCIATING,
NULL,
netdev->user_data);
/*
* We register the eapol state machine here, in case the PAE
* socket receives EAPoL packets before the nl80211 socket
* receives the connected event. The logical sequence of
* events can be reversed (e.g. connect_event, then PAE data)
* due to scheduling
*/
if (netdev->sm)
eapol_register(netdev->sm);
return;
}
netdev_connect_failed(netdev, NETDEV_RESULT_ASSOCIATION_FAILED,
MMPDU_STATUS_CODE_UNSPECIFIED);
}
static struct l_genl_msg *netdev_build_cmd_authenticate(struct netdev *netdev,
uint32_t auth_type,
const uint8_t *addr)
{
struct handshake_state *hs = netdev->handshake;
struct l_genl_msg *msg;
msg = l_genl_msg_new_sized(NL80211_CMD_AUTHENTICATE, 512);
l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &netdev->index);
l_genl_msg_append_attr(msg, NL80211_ATTR_WIPHY_FREQ,
4, &netdev->frequency);
l_genl_msg_append_attr(msg, NL80211_ATTR_MAC, ETH_ALEN, addr);
l_genl_msg_append_attr(msg, NL80211_ATTR_SSID, hs->ssid_len, hs->ssid);
l_genl_msg_append_attr(msg, NL80211_ATTR_AUTH_TYPE, 4, &auth_type);
l_genl_msg_append_attr(msg, NL80211_ATTR_IE, hs->supplicant_ie[1] + 2,
hs->supplicant_ie);
return msg;
}
static void netdev_auth_cb(struct l_genl_msg *msg, void *user_data)
{
struct netdev *netdev = user_data;
if (l_genl_msg_get_error(msg) < 0) {
l_error("Error sending CMD_AUTHENTICATE");
netdev_connect_failed(netdev,
NETDEV_RESULT_AUTHENTICATION_FAILED,
MMPDU_STATUS_CODE_UNSPECIFIED);
return;
}
}
static void netdev_assoc_cb(struct l_genl_msg *msg, void *user_data)
{
struct netdev *netdev = user_data;
if (l_genl_msg_get_error(msg) < 0) {
l_error("Error sending CMD_ASSOCIATE");
netdev_connect_failed(netdev, NETDEV_RESULT_ASSOCIATION_FAILED,
MMPDU_STATUS_CODE_UNSPECIFIED);
}
}
static void netdev_sae_tx_authenticate(const uint8_t *body,
size_t body_len, void *user_data)
{
struct netdev *netdev = user_data;
struct l_genl_msg *msg;
msg = netdev_build_cmd_authenticate(netdev, NL80211_AUTHTYPE_SAE,
netdev->handshake->aa);
l_genl_msg_append_attr(msg, NL80211_ATTR_AUTH_DATA, body_len, body);
if (!l_genl_family_send(nl80211, msg, netdev_auth_cb, netdev, NULL)) {
l_genl_msg_unref(msg);
netdev_connect_failed(netdev,
NETDEV_RESULT_AUTHENTICATION_FAILED,
MMPDU_STATUS_CODE_UNSPECIFIED);
}
}
static void netdev_sae_tx_associate(void *user_data)
{
struct netdev *netdev = user_data;
struct l_genl_msg *msg;
struct iovec iov[2];
int iov_elems = 0;
msg = netdev_build_cmd_associate_common(netdev);
iov[iov_elems].iov_base = netdev->handshake->supplicant_ie;
iov[iov_elems].iov_len = netdev->handshake->supplicant_ie[1] + 2;
iov_elems++;
if (netdev->handshake->mde) {
iov[iov_elems].iov_base = netdev->handshake->mde;
iov[iov_elems].iov_len = netdev->handshake->mde[1] + 2;
iov_elems++;
}
l_genl_msg_append_attrv(msg, NL80211_ATTR_IE, iov, iov_elems);
if (!l_genl_family_send(nl80211, msg, netdev_assoc_cb, netdev, NULL)) {
l_genl_msg_unref(msg);
netdev_connect_failed(netdev, NETDEV_RESULT_ASSOCIATION_FAILED,
MMPDU_STATUS_CODE_UNSPECIFIED);
}
}
static void netdev_owe_tx_authenticate(void *user_data)
{
struct netdev *netdev = user_data;
struct l_genl_msg *msg;
msg = netdev_build_cmd_authenticate(netdev,
NL80211_AUTHTYPE_OPEN_SYSTEM,
netdev->handshake->aa);
if (!l_genl_family_send(nl80211, msg, netdev_auth_cb,
netdev, NULL)) {
l_genl_msg_unref(msg);
netdev_connect_failed(netdev,
NETDEV_RESULT_AUTHENTICATION_FAILED,
MMPDU_STATUS_CODE_UNSPECIFIED);
}
}
static void netdev_owe_tx_associate(struct iovec *ie_iov, size_t iov_len,
void *user_data)
{
struct netdev *netdev = user_data;
struct l_genl_msg *msg;
msg = netdev_build_cmd_associate_common(netdev);
l_genl_msg_append_attrv(msg, NL80211_ATTR_IE, ie_iov, iov_len);
if (!l_genl_family_send(nl80211, msg, netdev_assoc_cb,
netdev, NULL)) {
l_genl_msg_unref(msg);
netdev_connect_failed(netdev, NETDEV_RESULT_ASSOCIATION_FAILED,
MMPDU_STATUS_CODE_UNSPECIFIED);
}
}
static void netdev_fils_tx_authenticate(const uint8_t *body,
size_t body_len,
void *user_data)
{
struct netdev *netdev = user_data;
struct l_genl_msg *msg;
msg = netdev_build_cmd_authenticate(netdev, NL80211_AUTHTYPE_FILS_SK,
netdev->handshake->aa);
l_genl_msg_append_attr(msg, NL80211_ATTR_AUTH_DATA, body_len, body);
if (!l_genl_family_send(nl80211, msg, netdev_auth_cb,
netdev, NULL)) {
l_genl_msg_unref(msg);
netdev_connect_failed(netdev,
NETDEV_RESULT_AUTHENTICATION_FAILED,
MMPDU_STATUS_CODE_UNSPECIFIED);
}
}
static void netdev_fils_tx_associate(struct iovec *iov, size_t iov_len,
const uint8_t *kek, size_t kek_len,
const uint8_t *nonces, size_t nonces_len,
void *user_data)
{
struct netdev *netdev = user_data;
struct l_genl_msg *msg;
msg = netdev_build_cmd_associate_common(netdev);
l_genl_msg_append_attrv(msg, NL80211_ATTR_IE, iov, iov_len);
l_genl_msg_append_attr(msg, NL80211_ATTR_FILS_KEK, kek_len, kek);
l_genl_msg_append_attr(msg, NL80211_ATTR_FILS_NONCES, nonces_len, nonces);
if (!l_genl_family_send(nl80211, msg, netdev_assoc_cb,
netdev, NULL)) {
l_genl_msg_unref(msg);
netdev_connect_failed(netdev, NETDEV_RESULT_ASSOCIATION_FAILED,
MMPDU_STATUS_CODE_UNSPECIFIED);
}
}
static struct l_genl_msg *netdev_build_cmd_connect(struct netdev *netdev,
struct scan_bss *bss,
struct handshake_state *hs,
const uint8_t *prev_bssid,
const struct iovec *vendor_ies,
size_t num_vendor_ies)
{
uint32_t auth_type = NL80211_AUTHTYPE_OPEN_SYSTEM;
struct l_genl_msg *msg;
struct iovec iov[4 + num_vendor_ies];
int iov_elems = 0;
bool is_rsn = hs->supplicant_ie != NULL;
const uint8_t *extended_capabilities;
const uint8_t *rm_enabled_capabilities;
msg = l_genl_msg_new_sized(NL80211_CMD_CONNECT, 512);
l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &netdev->index);
l_genl_msg_append_attr(msg, NL80211_ATTR_WIPHY_FREQ,
4, &bss->frequency);
l_genl_msg_append_attr(msg, NL80211_ATTR_MAC, ETH_ALEN, bss->addr);
l_genl_msg_append_attr(msg, NL80211_ATTR_SSID,
bss->ssid_len, bss->ssid);
l_genl_msg_append_attr(msg, NL80211_ATTR_AUTH_TYPE, 4, &auth_type);
if (prev_bssid)
l_genl_msg_append_attr(msg, NL80211_ATTR_PREV_BSSID, ETH_ALEN,
prev_bssid);
if (bss->capability & IE_BSS_CAP_PRIVACY)
l_genl_msg_append_attr(msg, NL80211_ATTR_PRIVACY, 0, NULL);
l_genl_msg_append_attr(msg, NL80211_ATTR_SOCKET_OWNER, 0, NULL);
if (is_rsn) {
uint32_t nl_cipher;
uint32_t nl_akm;
uint32_t wpa_version;
if (hs->pairwise_cipher == IE_RSN_CIPHER_SUITE_CCMP)
nl_cipher = CRYPTO_CIPHER_CCMP;
else
nl_cipher = CRYPTO_CIPHER_TKIP;
l_genl_msg_append_attr(msg, NL80211_ATTR_CIPHER_SUITES_PAIRWISE,
4, &nl_cipher);
if (hs->group_cipher == IE_RSN_CIPHER_SUITE_CCMP)
nl_cipher = CRYPTO_CIPHER_CCMP;
else
nl_cipher = CRYPTO_CIPHER_TKIP;
l_genl_msg_append_attr(msg, NL80211_ATTR_CIPHER_SUITE_GROUP,
4, &nl_cipher);
if (hs->mfp) {
uint32_t use_mfp = NL80211_MFP_REQUIRED;
l_genl_msg_append_attr(msg, NL80211_ATTR_USE_MFP,
4, &use_mfp);
}
nl_akm = ie_rsn_akm_suite_to_nl80211(hs->akm_suite);
if (nl_akm)
l_genl_msg_append_attr(msg, NL80211_ATTR_AKM_SUITES,
4, &nl_akm);
if (hs->wpa_ie)
wpa_version = NL80211_WPA_VERSION_1;
else
wpa_version = NL80211_WPA_VERSION_2;
l_genl_msg_append_attr(msg, NL80211_ATTR_WPA_VERSIONS,
4, &wpa_version);
l_genl_msg_append_attr(msg, NL80211_ATTR_CONTROL_PORT, 0, NULL);
iov[iov_elems].iov_base = (void *) hs->supplicant_ie;
iov[iov_elems].iov_len = hs->supplicant_ie[1] + 2;
iov_elems += 1;
}
if (netdev->pae_over_nl80211)
l_genl_msg_append_attr(msg,
NL80211_ATTR_CONTROL_PORT_OVER_NL80211,
0, NULL);
rm_enabled_capabilities =
wiphy_get_rm_enabled_capabilities(netdev->wiphy);
if (rm_enabled_capabilities && bss->capability & IE_BSS_CAP_RM) {
iov[iov_elems].iov_base = (void *) rm_enabled_capabilities;
iov[iov_elems].iov_len = rm_enabled_capabilities[1] + 2;
iov_elems += 1;
l_genl_msg_append_attr(msg, NL80211_ATTR_USE_RRM, 0, NULL);
}
if (hs->mde) {
iov[iov_elems].iov_base = (void *) hs->mde;
iov[iov_elems].iov_len = hs->mde[1] + 2;
iov_elems += 1;
}
/*
* This element should be added after MDE
* See 802.11-2016, Section 9.3.3.6
*/
extended_capabilities = wiphy_get_extended_capabilities(netdev->wiphy,
netdev->type);
iov[iov_elems].iov_base = (void *) extended_capabilities;
iov[iov_elems].iov_len = extended_capabilities[1] + 2;
iov_elems += 1;
if (vendor_ies) {
memcpy(iov + iov_elems, vendor_ies,
sizeof(*vendor_ies) * num_vendor_ies);
iov_elems += num_vendor_ies;
}
if (iov_elems)
l_genl_msg_append_attrv(msg, NL80211_ATTR_IE, iov, iov_elems);
return msg;
}
struct rtnl_data {
struct netdev *netdev;
struct l_genl_msg *cmd_connect;
uint8_t addr[ETH_ALEN];
int ref;
};
static int netdev_begin_connection(struct netdev *netdev,
struct l_genl_msg *cmd_connect)
{
if (cmd_connect) {
netdev->connect_cmd_id = l_genl_family_send(nl80211,
cmd_connect, netdev_cmd_connect_cb,
netdev, NULL);
if (!netdev->connect_cmd_id) {
l_genl_msg_unref(cmd_connect);
return -EIO;
}
}
handshake_state_set_supplicant_address(netdev->handshake, netdev->addr);
/* set connected since the auth protocols cannot do so internally */
if (netdev->ap && auth_proto_start(netdev->ap))
netdev->connected = true;
return 0;
}
static void netdev_mac_change_failed(struct netdev *netdev,
struct rtnl_data *req, int error)
{
l_error("Error setting mac address on %d: %s", netdev->index,
strerror(-error));
/*
* If the interface is down and we failed to up it we need to notify
* any watchers since we have been skipping the notification while
* mac_change_cmd_id was set.
*/
if (!netdev_get_is_up(netdev)) {
l_genl_msg_unref(req->cmd_connect);
WATCHLIST_NOTIFY(&netdev_watches, netdev_watch_func_t,
netdev, NETDEV_WATCH_EVENT_DOWN);
goto failed;
} else {
/*
* If the interface is up we can still try and connect. This
* is a very rare case and most likely will never happen.
*/
l_info("Interface still up after failing to change the MAC, "
"continuing with connection");
if (netdev_begin_connection(netdev, req->cmd_connect) < 0)
goto failed;
return;
}
failed:
netdev_connect_failed(netdev, NETDEV_RESULT_ABORTED,
MMPDU_STATUS_CODE_UNSPECIFIED);
}
static void netdev_mac_destroy(void *user_data)
{
struct rtnl_data *req = user_data;
req->ref--;
/* still pending requests? */
if (req->ref)
return;
l_free(req);
}
static void netdev_mac_power_up_cb(int error, uint16_t type,
const void *data, uint32_t len,
void *user_data)
{
struct rtnl_data *req = user_data;
struct netdev *netdev = req->netdev;
netdev->mac_change_cmd_id = 0;
if (error) {
l_error("Error taking interface %u up for per-network MAC "
"generation: %s", netdev->index, strerror(-error));
netdev_mac_change_failed(netdev, req, error);
return;
}
/*
* Pick up where we left off in netdev_connect_commmon.
*/
if (netdev_begin_connection(netdev, req->cmd_connect) < 0) {
l_error("Failed to connect after changing MAC");
netdev_connect_failed(netdev, NETDEV_RESULT_ASSOCIATION_FAILED,
MMPDU_STATUS_CODE_UNSPECIFIED);
}
}
static void netdev_mac_power_down_cb(int error, uint16_t type,
const void *data, uint32_t len,
void *user_data)
{
struct rtnl_data *req = user_data;
struct netdev *netdev = req->netdev;
netdev->mac_change_cmd_id = 0;
if (error) {
l_error("Error taking interface %u down for per-network MAC "
"generation: %s", netdev->index, strerror(-error));
netdev_mac_change_failed(netdev, req, error);
return;
}
l_debug("Setting generated address on ifindex: %d to: "MAC,
netdev->index, MAC_STR(req->addr));
netdev->mac_change_cmd_id = l_rtnl_set_mac(rtnl, netdev->index,
req->addr, true,
netdev_mac_power_up_cb, req,
netdev_mac_destroy);
if (!netdev->mac_change_cmd_id) {
netdev_mac_change_failed(netdev, req, -EIO);
return;
}
req->ref++;
}
/*
* TODO: There are some potential race conditions that are being ignored. There
* is nothing that IWD itself can do to solve these, they require kernel
* changes:
*
* 1. A perfectly timed ifdown could be ignored. If an external process
* brings down an interface just before calling this function we would only
* get a single newlink event since there is no state change doing a second
* ifdown (nor an error from the kernel). This newlink event would be ignored
* since IWD thinks its from our own doing. This would result in IWD changing
* the MAC and bringing the interface back up which would look very strange
* and unexpected to someone who just tried to ifdown an interface.
*
* 2. A perfectly timed ifup could result in a failed connection. If an external
* process ifup's just after IWD ifdown's but before changing the MAC this
* would cause the MAC change to fail. This failure would result in a failed
* connection.
*
* Returns 0 if a MAC change procedure was started.
* Returns -EALREADY if the requested MAC matched our current MAC
* Returns -EIO if there was an IO error when powering down
*/
static int netdev_start_powered_mac_change(struct netdev *netdev,
struct scan_bss *bss,
struct l_genl_msg *cmd_connect)
{
struct rtnl_data *req;
uint8_t new_addr[6];
/* No address set in handshake, use per-network MAC generation */
if (util_mem_is_zero(netdev->handshake->spa, ETH_ALEN))
wiphy_generate_address_from_ssid(netdev->wiphy,
(const char *)bss->ssid,
new_addr);
else
memcpy(new_addr, netdev->handshake->spa, ETH_ALEN);
/*
* MAC has already been changed previously, no need to again
*/
if (!memcmp(new_addr, netdev->addr, sizeof(new_addr)))
return -EALREADY;
req = l_new(struct rtnl_data, 1);
req->netdev = netdev;
/* This message will need to be unreffed upon any error */
req->cmd_connect = cmd_connect;
req->ref++;
memcpy(req->addr, new_addr, sizeof(req->addr));
netdev->mac_change_cmd_id = l_rtnl_set_powered(rtnl, netdev->index,
false, netdev_mac_power_down_cb,
req, netdev_mac_destroy);
if (!netdev->mac_change_cmd_id) {
l_genl_msg_unref(req->cmd_connect);
l_free(req);
return -EIO;
}
return 0;
}
static int netdev_connect_common(struct netdev *netdev,
struct l_genl_msg *cmd_connect,
struct scan_bss *bss,
struct handshake_state *hs,
struct eapol_sm *sm,
netdev_event_func_t event_filter,
netdev_connect_cb_t cb, void *user_data)
{
netdev->event_filter = event_filter;
netdev->connect_cb = cb;
netdev->user_data = user_data;
netdev->handshake = hs;
netdev->sm = sm;
netdev->frequency = bss->frequency;
netdev->cur_rssi_low = false; /* Gets updated on the 1st CQM event */
netdev->cur_rssi = bss->signal_strength / 100;
netdev_rssi_level_init(netdev);
handshake_state_set_authenticator_address(hs, bss->addr);
if (!wiphy_has_ext_feature(netdev->wiphy,
NL80211_EXT_FEATURE_CAN_REPLACE_PTK0))
handshake_state_set_no_rekey(hs, true);
if (mac_per_ssid) {
int ret = netdev_start_powered_mac_change(netdev, bss,
cmd_connect);
if (ret != -EALREADY)
return ret;
}
return netdev_begin_connection(netdev, cmd_connect);
}
int netdev_connect(struct netdev *netdev, struct scan_bss *bss,
struct handshake_state *hs,
const struct iovec *vendor_ies,
size_t num_vendor_ies,
netdev_event_func_t event_filter,
netdev_connect_cb_t cb, void *user_data)
{
struct l_genl_msg *cmd_connect = NULL;
struct eapol_sm *sm = NULL;
bool is_rsn = hs->supplicant_ie != NULL;
if (netdev->type != NL80211_IFTYPE_STATION &&
netdev->type != NL80211_IFTYPE_P2P_CLIENT)
return -ENOTSUP;
if (netdev->connected || netdev->connect_cmd_id)
return -EISCONN;
switch (hs->akm_suite) {
case IE_RSN_AKM_SUITE_SAE_SHA256:
case IE_RSN_AKM_SUITE_FT_OVER_SAE_SHA256:
netdev->ap = sae_sm_new(hs, netdev_sae_tx_authenticate,
netdev_sae_tx_associate,
netdev);
break;
case IE_RSN_AKM_SUITE_OWE:
netdev->ap = owe_sm_new(hs, netdev_owe_tx_authenticate,
netdev_owe_tx_associate,
netdev);
break;
case IE_RSN_AKM_SUITE_FILS_SHA256:
case IE_RSN_AKM_SUITE_FILS_SHA384:
case IE_RSN_AKM_SUITE_FT_OVER_FILS_SHA256:
case IE_RSN_AKM_SUITE_FT_OVER_FILS_SHA384:
netdev->ap = fils_sm_new(hs, netdev_fils_tx_authenticate,
netdev_fils_tx_associate,
netdev);
break;
default:
cmd_connect = netdev_build_cmd_connect(netdev, bss, hs,
NULL, vendor_ies, num_vendor_ies);
if (!cmd_connect)
return -EINVAL;
if (is_rsn || hs->settings_8021x)
sm = eapol_sm_new(hs);
}
return netdev_connect_common(netdev, cmd_connect, bss, hs, sm,
event_filter, cb, user_data);
}
int netdev_disconnect(struct netdev *netdev,
netdev_disconnect_cb_t cb, void *user_data)
{
struct l_genl_msg *disconnect;
if (netdev->type != NL80211_IFTYPE_STATION &&
netdev->type != NL80211_IFTYPE_P2P_CLIENT)
return -ENOTSUP;
if (!netdev->connected)
return -ENOTCONN;
if (netdev->disconnect_cmd_id)
return -EINPROGRESS;
/* Only perform this if we haven't successfully fully associated yet */
if (!netdev->operational) {
if (netdev->connect_cmd_id) {
l_genl_family_cancel(nl80211, netdev->connect_cmd_id);
netdev->connect_cmd_id = 0;
}
netdev_connect_failed(netdev, NETDEV_RESULT_ABORTED,
MMPDU_REASON_CODE_UNSPECIFIED);
} else {
netdev_connect_free(netdev);
}
disconnect = netdev_build_cmd_disconnect(netdev,
MMPDU_REASON_CODE_DEAUTH_LEAVING);
netdev->disconnect_cmd_id = l_genl_family_send(nl80211, disconnect,
netdev_cmd_disconnect_cb, netdev, NULL);
if (!netdev->disconnect_cmd_id) {
l_genl_msg_unref(disconnect);
return -EIO;
}
netdev->disconnect_cb = cb;
netdev->user_data = user_data;
netdev->aborting = true;
return 0;
}
int netdev_reassociate(struct netdev *netdev, struct scan_bss *target_bss,
struct scan_bss *orig_bss, struct handshake_state *hs,
netdev_event_func_t event_filter,
netdev_connect_cb_t cb, void *user_data)
{
struct l_genl_msg *cmd_connect;
struct netdev_handshake_state;
struct handshake_state *old_hs;
struct eapol_sm *sm = NULL, *old_sm;
bool is_rsn = hs->supplicant_ie != NULL;
int err;
cmd_connect = netdev_build_cmd_connect(netdev, target_bss, hs,
orig_bss->addr, NULL, 0);
if (!cmd_connect)
return -EINVAL;
if (is_rsn)
sm = eapol_sm_new(hs);
old_sm = netdev->sm;
old_hs = netdev->handshake;
err = netdev_connect_common(netdev, cmd_connect, target_bss, hs, sm,
event_filter, cb, user_data);
if (err < 0)
return err;
memcpy(netdev->prev_bssid, orig_bss->addr, ETH_ALEN);
netdev->operational = false;
netdev_rssi_polling_update(netdev);
if (old_sm)
eapol_sm_free(old_sm);
if (old_hs)
handshake_state_free(old_hs);
return err;
}
static void netdev_join_adhoc_cb(struct l_genl_msg *msg, void *user_data)
{
struct netdev *netdev = user_data;
netdev->join_adhoc_cmd_id = 0;
if (netdev->adhoc_cb)
netdev->adhoc_cb(netdev, l_genl_msg_get_error(msg),
netdev->user_data);
}
int netdev_join_adhoc(struct netdev *netdev, const char *ssid,
struct iovec *extra_ie, size_t extra_ie_elems,
bool control_port, netdev_command_cb_t cb,
void *user_data)
{
struct l_genl_msg *cmd;
uint32_t ifindex = netdev->index;
uint32_t ch_freq = scan_channel_to_freq(6, SCAN_BAND_2_4_GHZ);
uint32_t ch_type = NL80211_CHAN_HT20;
if (netdev->type != NL80211_IFTYPE_ADHOC) {
l_error("iftype is invalid for adhoc: %u",
netdev_get_iftype(netdev));
return -ENOTSUP;
}
if (netdev->join_adhoc_cmd_id || netdev->leave_adhoc_cmd_id)
return -EBUSY;
netdev->adhoc_cb = cb;
netdev->user_data = user_data;
cmd = l_genl_msg_new_sized(NL80211_CMD_JOIN_IBSS, 128);
l_genl_msg_append_attr(cmd, NL80211_ATTR_IFINDEX, 4, &ifindex);
l_genl_msg_append_attr(cmd, NL80211_ATTR_SSID, strlen(ssid), ssid);
l_genl_msg_append_attr(cmd, NL80211_ATTR_WIPHY_FREQ, 4, &ch_freq);
l_genl_msg_append_attr(cmd, NL80211_ATTR_WIPHY_CHANNEL_TYPE, 4,
&ch_type);
l_genl_msg_append_attrv(cmd, NL80211_ATTR_IE, extra_ie, extra_ie_elems);
l_genl_msg_append_attr(cmd, NL80211_ATTR_SOCKET_OWNER, 0, NULL);
if (control_port) {
l_genl_msg_append_attr(cmd, NL80211_ATTR_CONTROL_PORT, 0, NULL);
if (netdev->pae_over_nl80211)
l_genl_msg_append_attr(cmd,
NL80211_ATTR_CONTROL_PORT_OVER_NL80211,
0, NULL);
}
netdev->join_adhoc_cmd_id = l_genl_family_send(nl80211, cmd,
netdev_join_adhoc_cb, netdev, NULL);
if (!netdev->join_adhoc_cmd_id) {
netdev->adhoc_cb = NULL;
netdev->user_data = NULL;
return -EIO;
}
return 0;
}
static void netdev_leave_adhoc_cb(struct l_genl_msg *msg, void *user_data)
{
struct netdev *netdev = user_data;
netdev->leave_adhoc_cmd_id = 0;
if (netdev->adhoc_cb)
netdev->adhoc_cb(netdev, l_genl_msg_get_error(msg),
netdev->user_data);
netdev->adhoc_cb = NULL;
}
int netdev_leave_adhoc(struct netdev *netdev, netdev_command_cb_t cb,
void *user_data)
{
struct l_genl_msg *cmd;
if (netdev->type != NL80211_IFTYPE_ADHOC) {
l_error("iftype is invalid for adhoc: %u",
netdev_get_iftype(netdev));
return -ENOTSUP;
}
if (netdev->join_adhoc_cmd_id || netdev->leave_adhoc_cmd_id)
return -EBUSY;
netdev->adhoc_cb = cb;
netdev->user_data = user_data;
cmd = l_genl_msg_new_sized(NL80211_CMD_LEAVE_IBSS, 64);
l_genl_msg_append_attr(cmd, NL80211_ATTR_IFINDEX, 4, &netdev->index);
netdev->leave_adhoc_cmd_id = l_genl_family_send(nl80211, cmd,
netdev_leave_adhoc_cb, netdev,
NULL);
if (!netdev->leave_adhoc_cmd_id)
return -EIO;
return 0;
}
static uint32_t netdev_send_action_framev(struct netdev *netdev,
const uint8_t *to,
struct iovec *iov, size_t iov_len,
uint32_t freq,
l_genl_msg_func_t callback)
{
uint32_t id;
struct l_genl_msg *msg = nl80211_build_cmd_frame(netdev->index,
netdev->addr,
to, freq,
iov, iov_len);
id = l_genl_family_send(nl80211, msg, callback, netdev, NULL);
if (!id)
l_genl_msg_unref(msg);
return id;
}
static uint32_t netdev_send_action_frame(struct netdev *netdev,
const uint8_t *to,
const uint8_t *body, size_t body_len,
uint32_t freq,
l_genl_msg_func_t callback)
{
struct iovec iov[1];
iov[0].iov_base = (void *)body;
iov[0].iov_len = body_len;
return netdev_send_action_framev(netdev, to, iov, 1, freq, callback);
}
/*
* Build an FT Authentication Request frame according to 12.5.2 / 12.5.4:
* RSN or non-RSN Over-the-air FT Protocol, with the IE contents
* according to 12.8.2: FT authentication sequence: contents of first message.
*/
static struct l_genl_msg *netdev_build_cmd_ft_authenticate(
struct netdev *netdev,
const struct handshake_state *hs)
{
uint32_t auth_type = NL80211_AUTHTYPE_FT;
struct l_genl_msg *msg;
msg = l_genl_msg_new_sized(NL80211_CMD_AUTHENTICATE, 512);
l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &netdev->index);
l_genl_msg_append_attr(msg, NL80211_ATTR_WIPHY_FREQ,
4, &netdev->frequency);
l_genl_msg_append_attr(msg, NL80211_ATTR_MAC, ETH_ALEN, hs->aa);
l_genl_msg_append_attr(msg, NL80211_ATTR_SSID, hs->ssid_len, hs->ssid);
l_genl_msg_append_attr(msg, NL80211_ATTR_AUTH_TYPE, 4, &auth_type);
return msg;
}
static void netdev_cmd_authenticate_ft_cb(struct l_genl_msg *msg,
void *user_data)
{
struct netdev *netdev = user_data;
netdev->connect_cmd_id = 0;
if (l_genl_msg_get_error(msg) < 0)
netdev_connect_failed(netdev,
NETDEV_RESULT_AUTHENTICATION_FAILED,
MMPDU_STATUS_CODE_UNSPECIFIED);
}
static void netdev_ft_tx_authenticate(struct iovec *iov,
size_t iov_len, void *user_data)
{
struct netdev *netdev = user_data;
struct l_genl_msg *cmd_authenticate;
cmd_authenticate = netdev_build_cmd_ft_authenticate(netdev,
netdev->handshake);
if (!cmd_authenticate)
goto restore_snonce;
l_genl_msg_append_attrv(cmd_authenticate, NL80211_ATTR_IE, iov,
iov_len);
netdev->connect_cmd_id = l_genl_family_send(nl80211,
cmd_authenticate,
netdev_cmd_authenticate_ft_cb,
netdev, NULL);
if (!netdev->connect_cmd_id) {
l_genl_msg_unref(cmd_authenticate);
goto restore_snonce;
}
return;
restore_snonce:
memcpy(netdev->handshake->snonce, netdev->prev_snonce, 32);
netdev_connect_failed(netdev, NETDEV_RESULT_AUTHENTICATION_FAILED,
MMPDU_STATUS_CODE_UNSPECIFIED);
}
static void netdev_ft_tx_associate(struct iovec *ie_iov, size_t iov_len,
void *user_data)
{
struct netdev *netdev = user_data;
struct l_genl_msg *msg;
msg = netdev_build_cmd_associate_common(netdev);
l_genl_msg_append_attr(msg, NL80211_ATTR_PREV_BSSID, ETH_ALEN,
netdev->prev_bssid);
l_genl_msg_append_attrv(msg, NL80211_ATTR_IE, ie_iov, iov_len);
netdev->connect_cmd_id = l_genl_family_send(nl80211, msg,
netdev_cmd_ft_reassociate_cb,
netdev, NULL);
if (!netdev->connect_cmd_id) {
l_genl_msg_unref(msg);
netdev_connect_failed(netdev, NETDEV_RESULT_ASSOCIATION_FAILED,
MMPDU_STATUS_CODE_UNSPECIFIED);
return;
}
}
static void netdev_ft_request_cb(struct l_genl_msg *msg, void *user_data)
{
struct netdev *netdev = user_data;
if (l_genl_msg_get_error(msg) < 0) {
l_error("Could not send CMD_FRAME");
netdev_connect_failed(netdev,
NETDEV_RESULT_AUTHENTICATION_FAILED,
MMPDU_STATUS_CODE_UNSPECIFIED);
}
}
static void netdev_ft_response_frame_event(const struct mmpdu_header *hdr,
const void *body, size_t body_len,
int rssi, void *user_data)
{
int ret;
uint16_t status_code = MMPDU_STATUS_CODE_UNSPECIFIED;
struct netdev *netdev = user_data;
if (!netdev->ap || !netdev->in_ft)
return;
ret = auth_proto_rx_authenticate(netdev->ap, body, body_len);
if (ret < 0)
goto ft_error;
else if (ret > 0) {
status_code = (uint16_t)ret;
goto ft_error;
}
return;
ft_error:
netdev_connect_failed(netdev, NETDEV_RESULT_AUTHENTICATION_FAILED,
status_code);
return;
}
static void netdev_qos_map_frame_event(const struct mmpdu_header *hdr,
const void *body, size_t body_len,
int rssi, void *user_data)
{
struct netdev *netdev = user_data;
/* No point telling the kernel */
if (!netdev->connected)
return;
if (memcmp(netdev->handshake->aa, hdr->address_2, ETH_ALEN))
return;
if (body_len < 5)
return;
if (l_get_u8(body + 2) != IE_TYPE_QOS_MAP_SET)
return;
netdev_send_qos_map_set(netdev, body + 4, body_len - 4);
}
static void netdev_ft_over_ds_tx_authenticate(struct iovec *iov,
size_t iov_len, void *user_data)
{
struct netdev *netdev = user_data;
uint8_t ft_req[14];
struct handshake_state *hs = netdev->handshake;
struct iovec iovs[iov_len + 1];
ft_req[0] = 6; /* FT category */
ft_req[1] = 1; /* FT Request action */
memcpy(ft_req + 2, netdev->addr, 6);
memcpy(ft_req + 8, hs->aa, 6);
iovs[0].iov_base = ft_req;
iovs[0].iov_len = sizeof(ft_req);
memcpy(iovs + 1, iov, sizeof(*iov) * iov_len);
netdev_send_action_framev(netdev, netdev->prev_bssid, iovs, iov_len + 1,
netdev->prev_frequency,
netdev_ft_request_cb);
}
static int fast_transition(struct netdev *netdev, struct scan_bss *target_bss,
bool over_air,
netdev_connect_cb_t cb)
{
struct netdev_handshake_state *nhs;
int err = -EINVAL;
if (!netdev->operational)
return -ENOTCONN;
if (!netdev->handshake->mde || !target_bss->mde_present ||
l_get_le16(netdev->handshake->mde + 2) !=
l_get_le16(target_bss->mde))
return -EINVAL;
/*
* We reuse the handshake_state object and reset what's needed.
* Could also create a new object and copy most of the state but
* we would end up doing more work.
*/
memcpy(netdev->prev_bssid, netdev->handshake->aa, ETH_ALEN);
memcpy(netdev->prev_snonce, netdev->handshake->snonce, 32);
handshake_state_new_snonce(netdev->handshake);
netdev->prev_frequency = netdev->frequency;
netdev->frequency = target_bss->frequency;
handshake_state_set_authenticator_address(netdev->handshake,
target_bss->addr);
if (target_bss->rsne)
handshake_state_set_authenticator_ie(netdev->handshake,
target_bss->rsne);
memcpy(netdev->handshake->mde + 2, target_bss->mde, 3);
netdev->operational = false;
netdev->in_ft = true;
netdev->connect_cb = cb;
/*
* Cancel commands that could be running because of EAPoL activity
* like re-keying, this way the callbacks for those commands don't
* have to check if failures resulted from the transition.
*/
nhs = l_container_of(netdev->handshake,
struct netdev_handshake_state, super);
/* reset key states just as we do in initialization */
nhs->complete = false;
nhs->ptk_installed = false;
nhs->gtk_installed = true;
nhs->igtk_installed = true;
if (nhs->group_new_key_cmd_id) {
l_genl_family_cancel(nl80211, nhs->group_new_key_cmd_id);
nhs->group_new_key_cmd_id = 0;
}
if (nhs->group_management_new_key_cmd_id) {
l_genl_family_cancel(nl80211,
nhs->group_management_new_key_cmd_id);
nhs->group_management_new_key_cmd_id = 0;
}
if (netdev->rekey_offload_cmd_id) {
l_genl_family_cancel(nl80211, netdev->rekey_offload_cmd_id);
netdev->rekey_offload_cmd_id = 0;
}
netdev_rssi_polling_update(netdev);
if (netdev->sm) {
eapol_sm_free(netdev->sm);
netdev->sm = NULL;
}
if (over_air)
netdev->ap = ft_over_air_sm_new(netdev->handshake,
netdev_ft_tx_authenticate,
netdev_ft_tx_associate, netdev);
else
netdev->ap = ft_over_ds_sm_new(netdev->handshake,
netdev_ft_over_ds_tx_authenticate,
netdev_ft_tx_associate, netdev);
if (!auth_proto_start(netdev->ap))
goto restore_snonce;
return 0;
restore_snonce:
memcpy(netdev->handshake->snonce, netdev->prev_snonce, 32);
return err;
}
int netdev_fast_transition(struct netdev *netdev, struct scan_bss *target_bss,
netdev_connect_cb_t cb)
{
return fast_transition(netdev, target_bss, true, cb);
}
int netdev_fast_transition_over_ds(struct netdev *netdev,
struct scan_bss *target_bss,
netdev_connect_cb_t cb)
{
return fast_transition(netdev, target_bss, false, cb);
}
static void netdev_preauth_cb(const uint8_t *pmk, void *user_data)
{
struct netdev_preauth_state *preauth = user_data;
netdev_preauthenticate_cb_t cb = preauth->cb;
preauth->cb = NULL;
cb(preauth->netdev,
pmk ? NETDEV_RESULT_OK : NETDEV_RESULT_HANDSHAKE_FAILED,
pmk, preauth->user_data);
}
int netdev_preauthenticate(struct netdev *netdev, struct scan_bss *target_bss,
netdev_preauthenticate_cb_t cb, void *user_data)
{
struct netdev_preauth_state *preauth;
if (!netdev->operational)
return -ENOTCONN;
preauth = l_new(struct netdev_preauth_state, 1);
if (!eapol_preauth_start(target_bss->addr, netdev->handshake,
netdev_preauth_cb, preauth,
netdev_preauth_destroy)) {
l_free(preauth);
return -EIO;
}
preauth->cb = cb;
preauth->user_data = user_data;
preauth->netdev = netdev;
return 0;
}
static void netdev_neighbor_report_req_cb(struct l_genl_msg *msg,
void *user_data)
{
struct netdev *netdev = user_data;
if (!netdev->neighbor_report_cb)
return;
if (l_genl_msg_get_error(msg) < 0) {
netdev->neighbor_report_cb(netdev, l_genl_msg_get_error(msg),
NULL, 0, netdev->user_data);
netdev->neighbor_report_cb = NULL;
l_timeout_remove(netdev->neighbor_report_timeout);
}
}
static void netdev_neighbor_report_timeout(struct l_timeout *timeout,
void *user_data)
{
struct netdev *netdev = user_data;
netdev->neighbor_report_cb(netdev, -ETIMEDOUT, NULL, 0,
netdev->user_data);
netdev->neighbor_report_cb = NULL;
l_timeout_remove(netdev->neighbor_report_timeout);
}
int netdev_neighbor_report_req(struct netdev *netdev,
netdev_neighbor_report_cb_t cb)
{
const uint8_t action_frame[] = {
0x05, /* Category: Radio Measurement */
0x04, /* Radio Measurement Action: Neighbor Report Request */
0x01, /* Dialog Token: a non-zero value (unused) */
};
if (netdev->neighbor_report_cb || !netdev->connected)
return -EBUSY;
if (!netdev_send_action_frame(netdev, netdev->handshake->aa,
action_frame, sizeof(action_frame),
netdev->frequency,
netdev_neighbor_report_req_cb))
return -EIO;
netdev->neighbor_report_cb = cb;
/* Set a 3-second timeout */
netdev->neighbor_report_timeout =
l_timeout_create(3, netdev_neighbor_report_timeout,
netdev, NULL);
return 0;
}
static void netdev_neighbor_report_frame_event(const struct mmpdu_header *hdr,
const void *body, size_t body_len,
int rssi, void *user_data)
{
struct netdev *netdev = user_data;
if (body_len < 3) {
l_debug("Neighbor Report frame too short");
return;
}
if (!netdev->neighbor_report_cb)
return;
/*
* Don't use the dialog token (byte 3), return the first Neighbor
* Report Response received.
*
* Byte 1 is 0x05 for Radio Measurement, byte 2 is 0x05 for
* Neighbor Report.
*/
netdev->neighbor_report_cb(netdev, 0, body + 3, body_len - 3,
netdev->user_data);
netdev->neighbor_report_cb = NULL;
l_timeout_remove(netdev->neighbor_report_timeout);
}
static void netdev_sa_query_resp_cb(struct l_genl_msg *msg, void *user_data)
{
int err = l_genl_msg_get_error(msg);
const char *ext_error;
if (err >= 0)
return;
ext_error = l_genl_msg_get_extended_error(msg);
l_debug("error sending SA Query request: %s",
ext_error ? ext_error : strerror(-err));
}
static void netdev_sa_query_req_frame_event(const struct mmpdu_header *hdr,
const void *body, size_t body_len,
int rssi, void *user_data)
{
uint8_t sa_resp[4];
uint16_t transaction;
struct netdev *netdev = user_data;
if (body_len < 4) {
l_debug("SA Query request too short");
return;
}
if (!netdev->connected)
return;
/* only care about SA Queries from our connected AP */
if (memcmp(hdr->address_2, netdev->handshake->aa, 6))
return;
transaction = l_get_u16(body + 2);
sa_resp[0] = 0x08; /* SA Query */
sa_resp[1] = 0x01; /* Response */
memcpy(sa_resp + 2, &transaction, 2);
l_info("received SA Query request from "MAC", transaction=%u",
MAC_STR(hdr->address_2), transaction);
if (!netdev_send_action_frame(netdev, netdev->handshake->aa,
sa_resp, sizeof(sa_resp),
netdev->frequency,
netdev_sa_query_resp_cb)) {
l_error("error sending SA Query response");
return;
}
}
static void netdev_sa_query_resp_frame_event(const struct mmpdu_header *hdr,
const void *body, size_t body_len,
int rssi, void *user_data)
{
struct netdev *netdev = user_data;
if (body_len < 4) {
l_debug("SA Query frame too short");
return;
}
l_debug("SA Query src="MAC" dest="MAC" bssid="MAC" transaction=%u",
MAC_STR(hdr->address_2), MAC_STR(hdr->address_1),
MAC_STR(hdr->address_3), l_get_u16(body + 2));
if (!netdev->sa_query_timeout) {
l_debug("no SA Query request sent");
return;
}
/* check if this is from our connected BSS */
if (memcmp(hdr->address_2, netdev->handshake->aa, 6)) {
l_debug("received SA Query from non-connected AP");
return;
}
if (memcmp(body + 2, &netdev->sa_query_id, 2)) {
l_debug("SA Query transaction ID's did not match");
return;
}
l_info("SA Query response from connected BSS received, "
"keeping the connection active");
l_timeout_remove(netdev->sa_query_timeout);
netdev->sa_query_timeout = NULL;
}
static void netdev_sa_query_req_cb(struct l_genl_msg *msg, void *user_data)
{
struct netdev *netdev = user_data;
int err = l_genl_msg_get_error(msg);
const char *ext_error;
if (err >= 0)
return;
ext_error = l_genl_msg_get_extended_error(msg);
l_debug("error sending SA Query request: %s",
ext_error ? ext_error : strerror(-err));
l_timeout_remove(netdev->sa_query_timeout);
netdev->sa_query_timeout = NULL;
}
static void netdev_sa_query_timeout(struct l_timeout *timeout,
void *user_data)
{
struct netdev *netdev = user_data;
struct l_genl_msg *msg;
l_info("SA Query timed out, connection is invalid. Disconnecting...");
l_timeout_remove(netdev->sa_query_timeout);
netdev->sa_query_timeout = NULL;
msg = netdev_build_cmd_disconnect(netdev,
MMPDU_REASON_CODE_PREV_AUTH_NOT_VALID);
netdev->disconnect_cmd_id = l_genl_family_send(nl80211, msg,
netdev_disconnect_cb, netdev, NULL);
}
static void netdev_unprot_disconnect_event(struct l_genl_msg *msg,
struct netdev *netdev)
{
const struct mmpdu_header *hdr = NULL;
struct l_genl_attr attr;
uint16_t type;
uint16_t len;
const void *data;
uint8_t action_frame[4];
uint8_t reason_code;
if (!netdev->connected)
return;
/* ignore excessive disassociate requests */
if (netdev->sa_query_timeout)
return;
if (!l_genl_attr_init(&attr, msg))
return;
while (l_genl_attr_next(&attr, &type, &len, &data)) {
switch (type) {
case NL80211_ATTR_FRAME:
hdr = mpdu_validate(data, len);
break;
}
}
/* check that ATTR_FRAME was actually included */
if (!hdr)
return;
/* get reason code, first byte of frame */
reason_code = l_get_u8(mmpdu_body(hdr));
l_info("disconnect event, src="MAC" dest="MAC" bssid="MAC" reason=%u",
MAC_STR(hdr->address_2), MAC_STR(hdr->address_1),
MAC_STR(hdr->address_3), reason_code);
if (memcmp(hdr->address_2, netdev->handshake->aa, 6)) {
l_debug("received invalid disassociate frame");
return;
}
if (reason_code != MMPDU_REASON_CODE_CLASS2_FRAME_FROM_NONAUTH_STA &&
reason_code !=
MMPDU_REASON_CODE_CLASS3_FRAME_FROM_NONASSOC_STA) {
l_debug("invalid reason code %u", reason_code);
return;
}
action_frame[0] = 0x08; /* Category: SA Query */
action_frame[1] = 0x00; /* SA Query Action: Request */
/* Transaction ID */
l_getrandom(action_frame + 2, 2);
if (!netdev_send_action_frame(netdev, netdev->handshake->aa,
action_frame, sizeof(action_frame),
netdev->frequency,
netdev_sa_query_req_cb)) {
l_error("error sending SA Query action frame");
return;
}
netdev->sa_query_id = l_get_u16(action_frame + 2);
netdev->sa_query_timeout = l_timeout_create(3,
netdev_sa_query_timeout, netdev, NULL);
}
static void netdev_station_event(struct l_genl_msg *msg,
struct netdev *netdev, bool added)
{
struct l_genl_attr attr;
uint16_t type;
uint16_t len;
const void *data;
const uint8_t *mac = NULL;
if (netdev_get_iftype(netdev) != NETDEV_IFTYPE_ADHOC)
return;
if (!l_genl_attr_init(&attr, msg))
return;
while (l_genl_attr_next(&attr, &type, &len, &data)) {
switch (type) {
case NL80211_ATTR_MAC:
mac = data;
break;
}
}
if (!mac) {
l_error("%s station event did not include MAC attribute",
added ? "new" : "del");
return;
}
WATCHLIST_NOTIFY(&netdev->station_watches,
netdev_station_watch_func_t, netdev, mac, added);
}
static void netdev_mlme_notify(struct l_genl_msg *msg, void *user_data)
{
struct netdev *netdev = NULL;
struct l_genl_attr attr;
uint16_t type, len;
const void *data;
uint8_t cmd;
cmd = l_genl_msg_get_command(msg);
l_debug("MLME notification %s(%u)", nl80211cmd_to_string(cmd), cmd);
if (!l_genl_attr_init(&attr, msg))
return;
while (l_genl_attr_next(&attr, &type, &len, &data)) {
switch (type) {
case NL80211_ATTR_IFINDEX:
if (len != sizeof(uint32_t)) {
l_warn("Invalid interface index attribute");
return;
}
netdev = netdev_find(*((uint32_t *) data));
break;
}
}
if (!netdev)
return;
switch (cmd) {
case NL80211_CMD_AUTHENTICATE:
netdev_authenticate_event(msg, netdev);
break;
case NL80211_CMD_DEAUTHENTICATE:
netdev_deauthenticate_event(msg, netdev);
break;
case NL80211_CMD_ASSOCIATE:
netdev_associate_event(msg, netdev);
break;
case NL80211_CMD_CONNECT:
netdev_connect_event(msg, netdev);
break;
case NL80211_CMD_DISCONNECT:
netdev_disconnect_event(msg, netdev);
break;
case NL80211_CMD_NOTIFY_CQM:
netdev_cqm_event(msg, netdev);
break;
case NL80211_CMD_SET_REKEY_OFFLOAD:
netdev_rekey_offload_event(msg, netdev);
break;
case NL80211_CMD_UNPROT_DEAUTHENTICATE:
case NL80211_CMD_UNPROT_DISASSOCIATE:
netdev_unprot_disconnect_event(msg, netdev);
break;
case NL80211_CMD_NEW_STATION:
netdev_station_event(msg, netdev, true);
break;
case NL80211_CMD_DEL_STATION:
netdev_station_event(msg, netdev, false);
break;
}
}
static void netdev_pae_destroy(void *user_data)
{
struct netdev *netdev = user_data;
netdev->pae_io = NULL;
}
static bool netdev_pae_read(struct l_io *io, void *user_data)
{
int fd = l_io_get_fd(io);
struct sockaddr_ll sll;
socklen_t sll_len;
ssize_t bytes;
uint8_t frame[IEEE80211_MAX_DATA_LEN];
memset(&sll, 0, sizeof(sll));
sll_len = sizeof(sll);
bytes = recvfrom(fd, frame, sizeof(frame), 0,
(struct sockaddr *) &sll, &sll_len);
if (bytes <= 0) {
l_error("EAPoL read socket: %s", strerror(errno));
return false;
}
if (sll.sll_halen != ETH_ALEN)
return true;
__eapol_rx_packet(sll.sll_ifindex, sll.sll_addr,
ntohs(sll.sll_protocol), frame, bytes, false);
return true;
}
static void netdev_control_port_frame_event(struct l_genl_msg *msg,
struct netdev *netdev)
{
struct l_genl_attr attr;
uint16_t type;
uint16_t len;
const void *data;
const uint8_t *frame = NULL;
uint16_t frame_len = 0;
const uint8_t *src = NULL;
uint16_t proto = 0;
bool unencrypted = false;
l_debug("");
if (!l_genl_attr_init(&attr, msg))
return;
while (l_genl_attr_next(&attr, &type, &len, &data)) {
switch (type) {
case NL80211_ATTR_FRAME:
if (frame)
return;
frame = data;
frame_len = len;
break;
case NL80211_ATTR_MAC:
if (src)
return;
src = data;
break;
case NL80211_ATTR_CONTROL_PORT_ETHERTYPE:
if (len != sizeof(proto))
return;
proto = *((const uint16_t *) data);
break;
case NL80211_ATTR_CONTROL_PORT_NO_ENCRYPT:
unencrypted = true;
break;
}
}
if (!src || !frame || !proto)
return;
__eapol_rx_packet(netdev->index, src, proto,
frame, frame_len, unencrypted);
}
static struct l_genl_msg *netdev_build_control_port_frame(struct netdev *netdev,
const uint8_t *to,
uint16_t proto,
bool unencrypted,
const void *body,
size_t body_len)
{
struct l_genl_msg *msg;
msg = l_genl_msg_new_sized(NL80211_CMD_CONTROL_PORT_FRAME,
128 + body_len);
l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &netdev->index);
l_genl_msg_append_attr(msg, NL80211_ATTR_FRAME, body_len, body);
l_genl_msg_append_attr(msg, NL80211_ATTR_CONTROL_PORT_ETHERTYPE, 2,
&proto);
l_genl_msg_append_attr(msg, NL80211_ATTR_MAC, ETH_ALEN, to);
if (unencrypted)
l_genl_msg_append_attr(msg,
NL80211_ATTR_CONTROL_PORT_NO_ENCRYPT, 0, NULL);
return msg;
}
static void netdev_control_port_frame_cb(struct l_genl_msg *msg,
void *user_data)
{
int err = l_genl_msg_get_error(msg);
const char *ext_error;
if (err >= 0)
return;
ext_error = l_genl_msg_get_extended_error(msg);
l_error("CMD_CONTROL_PORT failed: %s",
ext_error ? ext_error : strerror(-err));
}
static int netdev_control_port_write_pae(struct netdev *netdev,
const uint8_t *dest,
uint16_t proto,
const struct eapol_frame *ef,
bool noencrypt)
{
int fd = l_io_get_fd(netdev->pae_io);
struct sockaddr_ll sll;
size_t frame_size = sizeof(struct eapol_header) +
L_BE16_TO_CPU(ef->header.packet_len);
ssize_t r;
memset(&sll, 0, sizeof(sll));
sll.sll_family = AF_PACKET;
sll.sll_ifindex = netdev->index;
sll.sll_protocol = htons(proto);
sll.sll_halen = ETH_ALEN;
memcpy(sll.sll_addr, dest, ETH_ALEN);
r = sendto(fd, ef, frame_size, 0,
(struct sockaddr *) &sll, sizeof(sll));
if (r < 0)
l_error("EAPoL write socket: %s", strerror(errno));
return r;
}
static int netdev_control_port_frame(uint32_t ifindex,
const uint8_t *dest, uint16_t proto,
const struct eapol_frame *ef,
bool noencrypt,
void *user_data)
{
struct l_genl_msg *msg;
struct netdev *netdev;
size_t frame_size;
netdev = netdev_find(ifindex);
if (!netdev)
return -ENOENT;
frame_size = sizeof(struct eapol_header) +
L_BE16_TO_CPU(ef->header.packet_len);
if (!netdev->pae_over_nl80211)
return netdev_control_port_write_pae(netdev, dest, proto,
ef, noencrypt);
msg = netdev_build_control_port_frame(netdev, dest, proto, noencrypt,
ef, frame_size);
if (!msg)
return -ENOMEM;
if (!l_genl_family_send(nl80211, msg, netdev_control_port_frame_cb,
netdev, NULL)) {
l_genl_msg_unref(msg);
return -EINVAL;
}
return 0;
}
static void netdev_unicast_notify(struct l_genl_msg *msg, void *user_data)
{
struct netdev *netdev = NULL;
struct l_genl_attr attr;
uint16_t type, len;
const void *data;
uint8_t cmd;
cmd = l_genl_msg_get_command(msg);
if (!cmd)
return;
l_debug("Unicast notification %u", cmd);
if (!l_genl_attr_init(&attr, msg))
return;
while (l_genl_attr_next(&attr, &type, &len, &data)) {
switch (type) {
case NL80211_ATTR_IFINDEX:
if (len != sizeof(uint32_t)) {
l_warn("Invalid interface index attribute");
return;
}
netdev = netdev_find(*((uint32_t *) data));
break;
}
}
if (!netdev)
return;
switch (cmd) {
case NL80211_CMD_CONTROL_PORT_FRAME:
netdev_control_port_frame_event(msg, netdev);
break;
}
}
static struct l_genl_msg *netdev_build_cmd_cqm_rssi_update(
struct netdev *netdev,
const int8_t *levels,
size_t levels_num)
{
struct l_genl_msg *msg;
uint32_t hyst = 5;
int thold_count;
int32_t thold_list[levels_num + 2];
if (levels_num == 0) {
thold_list[0] = LOW_SIGNAL_THRESHOLD;
thold_count = 1;
} else {
/*
* Build the list of all the threshold values we care about:
* - the low/high level threshold,
* - the value ranges requested by
* netdev_set_rssi_report_levels
*/
unsigned int i;
bool low_sig_added = false;
thold_count = 0;
for (i = 0; i < levels_num; i++) {
int32_t val = levels[levels_num - i - 1];
if (i && thold_list[thold_count - 1] >= val)
return NULL;
if (val >= LOW_SIGNAL_THRESHOLD && !low_sig_added) {
thold_list[thold_count++] =
LOW_SIGNAL_THRESHOLD;
low_sig_added = true;
/* Duplicate values are not allowed */
if (val == LOW_SIGNAL_THRESHOLD)
continue;
}
thold_list[thold_count++] = val;
}
}
msg = l_genl_msg_new_sized(NL80211_CMD_SET_CQM, 32 + thold_count * 4);
l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &netdev->index);
l_genl_msg_enter_nested(msg, NL80211_ATTR_CQM);
l_genl_msg_append_attr(msg, NL80211_ATTR_CQM_RSSI_THOLD,
thold_count * 4, thold_list);
l_genl_msg_append_attr(msg, NL80211_ATTR_CQM_RSSI_HYST, 4, &hyst);
l_genl_msg_leave_nested(msg);
return msg;
}
static void netdev_cmd_set_cqm_cb(struct l_genl_msg *msg, void *user_data)
{
int err = l_genl_msg_get_error(msg);
const char *ext_error;
if (err >= 0)
return;
ext_error = l_genl_msg_get_extended_error(msg);
l_error("CMD_SET_CQM failed: %s",
ext_error ? ext_error : strerror(-err));
}
int netdev_set_rssi_report_levels(struct netdev *netdev, const int8_t *levels,
size_t levels_num)
{
struct l_genl_msg *cmd_set_cqm;
l_debug("ifindex: %d, num_levels: %zu", netdev->index, levels_num);
if (levels_num > L_ARRAY_SIZE(netdev->rssi_levels))
return -ENOSPC;
if (!wiphy_has_ext_feature(netdev->wiphy,
NL80211_EXT_FEATURE_CQM_RSSI_LIST))
goto done;
cmd_set_cqm = netdev_build_cmd_cqm_rssi_update(netdev, levels,
levels_num);
if (!cmd_set_cqm)
return -EINVAL;
if (!l_genl_family_send(nl80211, cmd_set_cqm, netdev_cmd_set_cqm_cb,
NULL, NULL)) {
l_genl_msg_unref(cmd_set_cqm);
return -EIO;
}
done:
if (levels_num)
memcpy(netdev->rssi_levels, levels, levels_num);
netdev->rssi_levels_num = levels_num;
netdev_rssi_level_init(netdev);
netdev_rssi_polling_update(netdev);
return 0;
}
static int netdev_cqm_rssi_update(struct netdev *netdev)
{
struct l_genl_msg *msg;
l_debug("");
if (!wiphy_has_ext_feature(netdev->wiphy,
NL80211_EXT_FEATURE_CQM_RSSI_LIST))
return 0;
msg = netdev_build_cmd_cqm_rssi_update(netdev, netdev->rssi_levels,
netdev->rssi_levels_num);
if (!msg)
return -EINVAL;
if (!l_genl_family_send(nl80211, msg, netdev_cmd_set_cqm_cb,
NULL, NULL)) {
l_genl_msg_unref(msg);
return -EIO;
}
return 0;
}
static struct l_genl_msg *netdev_build_cmd_set_interface(struct netdev *netdev,
uint32_t iftype)
{
struct l_genl_msg *msg =
l_genl_msg_new_sized(NL80211_CMD_SET_INTERFACE, 32);
l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &netdev->index);
l_genl_msg_append_attr(msg, NL80211_ATTR_IFTYPE, 4, &iftype);
return msg;
}
struct netdev_set_iftype_request {
netdev_command_cb_t cb;
void *user_data;
netdev_destroy_func_t destroy;
uint32_t pending_type;
uint32_t ref;
struct netdev *netdev;
bool bring_up;
};
static void netdev_set_iftype_request_destroy(void *user_data)
{
struct netdev_set_iftype_request *req = user_data;
struct netdev *netdev = req->netdev;
req->ref--;
if (req->ref)
return;
netdev->set_powered_cmd_id = 0;
netdev->set_interface_cmd_id = 0;
if (req->destroy)
req->destroy(req->user_data);
l_free(req);
}
static void netdev_set_iftype_up_cb(int error, uint16_t type,
const void *data,
uint32_t len, void *user_data)
{
struct netdev_set_iftype_request *req = user_data;
struct netdev *netdev = req->netdev;
if (req->cb)
req->cb(netdev, error, req->user_data);
}
static void netdev_set_iftype_cb(struct l_genl_msg *msg, void *user_data)
{
struct netdev_set_iftype_request *req = user_data;
struct netdev *netdev = req->netdev;
int error = l_genl_msg_get_error(msg);
if (error != 0)
goto done;
netdev->type = req->pending_type;
/* Set RSSI threshold for CQM notifications */
if (netdev->type == NL80211_IFTYPE_STATION)
netdev_cqm_rssi_update(netdev);
/* If the netdev was down originally, we're done */
if (!req->bring_up)
goto done;
netdev->set_powered_cmd_id =
l_rtnl_set_powered(rtnl, netdev->index, true,
netdev_set_iftype_up_cb, req,
netdev_set_iftype_request_destroy);
if (!netdev->set_powered_cmd_id) {
error = -EIO;
goto done;
}
req->ref++;
netdev->set_interface_cmd_id = 0;
return;
done:
if (req->cb)
req->cb(netdev, error, req->user_data);
}
static void netdev_set_iftype_down_cb(int error, uint16_t type,
const void *data,
uint32_t len, void *user_data)
{
struct netdev_set_iftype_request *req = user_data;
struct netdev *netdev = req->netdev;
struct l_genl_msg *msg;
if (error != 0)
goto error;
msg = netdev_build_cmd_set_interface(netdev, req->pending_type);
netdev->set_interface_cmd_id =
l_genl_family_send(nl80211, msg, netdev_set_iftype_cb, req,
netdev_set_iftype_request_destroy);
if (!netdev->set_interface_cmd_id) {
l_genl_msg_unref(msg);
error = -EIO;
goto error;
}
req->ref++;
netdev->set_powered_cmd_id = 0;
return;
error:
if (req->cb)
req->cb(netdev, error, req->user_data);
}
int netdev_set_iftype(struct netdev *netdev, enum netdev_iftype type,
netdev_command_cb_t cb, void *user_data,
netdev_destroy_func_t destroy)
{
uint32_t iftype;
struct netdev_set_iftype_request *req;
switch (type) {
case NETDEV_IFTYPE_AP:
iftype = NL80211_IFTYPE_AP;
break;
case NETDEV_IFTYPE_ADHOC:
iftype = NL80211_IFTYPE_ADHOC;
break;
case NETDEV_IFTYPE_STATION:
iftype = NL80211_IFTYPE_STATION;
break;
default:
l_error("unsupported iftype %u", type);
return -EINVAL;
}
if (netdev->set_powered_cmd_id ||
netdev->set_interface_cmd_id)
return -EBUSY;
req = l_new(struct netdev_set_iftype_request, 1);
req->cb = cb;
req->user_data = user_data;
req->destroy = destroy;
req->pending_type = iftype;
req->netdev = netdev;
req->ref = 1;
req->bring_up = netdev_get_is_up(netdev);
if (!req->bring_up) {
struct l_genl_msg *msg =
netdev_build_cmd_set_interface(netdev, iftype);
netdev->set_interface_cmd_id =
l_genl_family_send(nl80211, msg,
netdev_set_iftype_cb, req,
netdev_set_iftype_request_destroy);
if (netdev->set_interface_cmd_id)
return 0;
l_genl_msg_unref(msg);
} else {
netdev->set_powered_cmd_id =
l_rtnl_set_powered(rtnl, netdev->index, false,
netdev_set_iftype_down_cb, req,
netdev_set_iftype_request_destroy);
if (netdev->set_powered_cmd_id)
return 0;
}
l_free(req);
return -EIO;
}
static void netdev_bridge_port_event(const struct ifinfomsg *ifi, int bytes,
bool added)
{
struct netdev *netdev;
struct rtattr *attr;
uint32_t master = 0;
netdev = netdev_find(ifi->ifi_index);
if (!netdev)
return;
for (attr = IFLA_RTA(ifi); RTA_OK(attr, bytes);
attr = RTA_NEXT(attr, bytes)) {
switch (attr->rta_type) {
case IFLA_MASTER:
memcpy(&master, RTA_DATA(attr), sizeof(master));
break;
}
}
l_debug("netdev: %d %s bridge: %d", ifi->ifi_index,
(added ? "added to" : "removed from"), master);
}
struct set_4addr_cb_data {
struct netdev *netdev;
bool value;
netdev_command_cb_t callback;
void *user_data;
netdev_destroy_func_t destroy;
};
static void netdev_set_4addr_cb(struct l_genl_msg *msg, void *user_data)
{
struct set_4addr_cb_data *cb_data = user_data;
int error = l_genl_msg_get_error(msg);
if (!cb_data)
return;
/* cache the value that has just been set */
if (!error)
cb_data->netdev->use_4addr = cb_data->value;
cb_data->callback(cb_data->netdev, error, cb_data->user_data);
}
static void netdev_set_4addr_destroy(void *user_data)
{
struct set_4addr_cb_data *cb_data = user_data;
if (!cb_data)
return;
if (cb_data->destroy)
cb_data->destroy(cb_data->user_data);
l_free(cb_data);
}
int netdev_set_4addr(struct netdev *netdev, bool use_4addr,
netdev_command_cb_t cb, void *user_data,
netdev_destroy_func_t destroy)
{
struct set_4addr_cb_data *cb_data = NULL;
uint8_t attr_4addr = (use_4addr ? 1 : 0);
struct l_genl_msg *msg;
l_debug("netdev: %d use_4addr: %d", netdev->index, use_4addr);
msg = l_genl_msg_new_sized(NL80211_CMD_SET_INTERFACE, 32);
l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &netdev->index);
l_genl_msg_append_attr(msg, NL80211_ATTR_4ADDR, 1, &attr_4addr);
if (cb) {
cb_data = l_new(struct set_4addr_cb_data, 1);
cb_data->netdev = netdev;
cb_data->value = use_4addr;
cb_data->callback = cb;
cb_data->user_data = user_data;
cb_data->destroy = destroy;
}
if (!l_genl_family_send(nl80211, msg, netdev_set_4addr_cb, cb_data,
netdev_set_4addr_destroy)) {
l_error("CMD_SET_INTERFACE (4addr) failed");
l_genl_msg_unref(msg);
l_free(cb_data);
return -EIO;
}
return 0;
}
bool netdev_get_4addr(struct netdev *netdev)
{
return netdev->use_4addr;
}
static void netdev_newlink_notify(const struct ifinfomsg *ifi, int bytes)
{
struct netdev *netdev;
bool old_up, new_up;
char old_name[IFNAMSIZ];
uint8_t old_addr[ETH_ALEN];
struct rtattr *attr;
if (ifi->ifi_family == AF_BRIDGE) {
netdev_bridge_port_event(ifi, bytes, true);
return;
}
netdev = netdev_find(ifi->ifi_index);
if (!netdev)
return;
old_up = netdev_get_is_up(netdev);
strcpy(old_name, netdev->name);
memcpy(old_addr, netdev->addr, ETH_ALEN);
netdev->ifi_flags = ifi->ifi_flags;
for (attr = IFLA_RTA(ifi); RTA_OK(attr, bytes);
attr = RTA_NEXT(attr, bytes)) {
switch (attr->rta_type) {
case IFLA_IFNAME:
strcpy(netdev->name, RTA_DATA(attr));
break;
case IFLA_ADDRESS:
if (RTA_PAYLOAD(attr) < ETH_ALEN)
break;
memcpy(netdev->addr, RTA_DATA(attr), ETH_ALEN);
break;
}
}
if (!netdev->events_ready) /* Did we send NETDEV_WATCH_EVENT_NEW yet? */
return;
new_up = netdev_get_is_up(netdev);
/*
* If mac_change_cmd_id is set we are in the process of changing the
* MAC address and this event is a result of powering down/up. In this
* case we do not want to emit a netdev DOWN/UP event as this would
* cause other modules to behave as such. We do, however, want to emit
* address changes so other modules get the new MAC address updated.
*/
if (old_up != new_up && !netdev->mac_change_cmd_id)
WATCHLIST_NOTIFY(&netdev_watches, netdev_watch_func_t,
netdev, new_up ? NETDEV_WATCH_EVENT_UP :
NETDEV_WATCH_EVENT_DOWN);
if (strcmp(old_name, netdev->name))
WATCHLIST_NOTIFY(&netdev_watches, netdev_watch_func_t,
netdev, NETDEV_WATCH_EVENT_NAME_CHANGE);
if (memcmp(old_addr, netdev->addr, ETH_ALEN))
WATCHLIST_NOTIFY(&netdev_watches, netdev_watch_func_t,
netdev, NETDEV_WATCH_EVENT_ADDRESS_CHANGE);
}
static void netdev_dellink_notify(const struct ifinfomsg *ifi, int bytes)
{
struct netdev *netdev;
if (ifi->ifi_family == AF_BRIDGE) {
netdev_bridge_port_event(ifi, bytes, false);
return;
}
netdev = l_queue_remove_if(netdev_list, netdev_match,
L_UINT_TO_PTR(ifi->ifi_index));
if (!netdev)
return;
netdev_free(netdev);
}
static void netdev_initial_up_cb(int error, uint16_t type, const void *data,
uint32_t len, void *user_data)
{
struct netdev *netdev = user_data;
netdev->set_powered_cmd_id = 0;
if (!error)
netdev->ifi_flags |= IFF_UP;
else {
l_error("Error bringing interface %i up: %s", netdev->index,
strerror(-error));
if (error != -ERFKILL)
return;
}
l_rtnl_set_linkmode_and_operstate(rtnl, netdev->index,
IF_LINK_MODE_DORMANT, IF_OPER_DOWN,
netdev_operstate_cb,
L_UINT_TO_PTR(netdev->index), NULL);
/*
* we don't know the initial status of the 4addr property on this
* netdev, therefore we set it to zero by default.
*/
netdev_set_4addr(netdev, netdev->use_4addr, NULL, NULL, NULL);
l_debug("Interface %i initialized", netdev->index);
scan_wdev_add(netdev->wdev_id);
WATCHLIST_NOTIFY(&netdev_watches, netdev_watch_func_t,
netdev, NETDEV_WATCH_EVENT_NEW);
netdev->events_ready = true;
}
static bool netdev_check_set_mac(struct netdev *netdev)
{
if (util_mem_is_zero(netdev->set_mac_once, 6))
return false;
l_debug("Setting initial address on ifindex: %d to: " MAC,
netdev->index, MAC_STR(netdev->set_mac_once));
netdev->set_powered_cmd_id =
l_rtnl_set_mac(rtnl, netdev->index, netdev->set_mac_once, true,
netdev_initial_up_cb, netdev, NULL);
memset(netdev->set_mac_once, 0, 6);
return true;
}
static void netdev_initial_down_cb(int error, uint16_t type, const void *data,
uint32_t len, void *user_data)
{
struct netdev *netdev = user_data;
if (!error)
netdev->ifi_flags &= ~IFF_UP;
else {
l_error("Error taking interface %i down: %s", netdev->index,
strerror(-error));
netdev->set_powered_cmd_id = 0;
return;
}
if (netdev_check_set_mac(netdev))
return;
netdev->set_powered_cmd_id =
l_rtnl_set_powered(rtnl, netdev->index, true,
netdev_initial_up_cb, netdev, NULL);
}
static void netdev_getlink_cb(int error, uint16_t type, const void *data,
uint32_t len, void *user_data)
{
const struct ifinfomsg *ifi = data;
unsigned int bytes;
struct netdev *netdev;
l_netlink_command_func_t cb;
bool powered;
if (error != 0) {
l_error("RTM_GETLINK error %i: %s", error, strerror(-error));
return;
}
if (ifi->ifi_type != ARPHRD_ETHER || type != RTM_NEWLINK) {
l_debug("Non-ethernet address or not newlink message -- "
"ifi_type: %i, type: %i", ifi->ifi_type, type);
return;
}
netdev = netdev_find(ifi->ifi_index);
if (!netdev)
return;
bytes = len - NLMSG_ALIGN(sizeof(struct ifinfomsg));
netdev_newlink_notify(ifi, bytes);
/*
* If the interface is UP, reset it to ensure a clean state.
* Otherwise, if we need to set a random mac, do so. If not, just
* bring the interface UP.
*/
powered = netdev_get_is_up(netdev);
if (!powered && netdev_check_set_mac(netdev))
return;
cb = powered ? netdev_initial_down_cb : netdev_initial_up_cb;
netdev->set_powered_cmd_id =
l_rtnl_set_powered(rtnl, ifi->ifi_index, !powered, cb, netdev,
NULL);
}
static struct l_io *pae_open(uint32_t ifindex)
{
/*
* BPF filter to match skb->dev->type == 1 (ARPHRD_ETHER) and
* match skb->protocol == 0x888e (PAE) or 0x88c7 (preauthentication).
*/
struct sock_filter pae_filter[] = {
{ 0x20, 0, 0, 0xfffff008 }, /* ld #ifidx */
{ 0x15, 0, 6, 0x00000000 }, /* jne #0, drop */
{ 0x28, 0, 0, 0xfffff01c }, /* ldh #hatype */
{ 0x15, 0, 4, 0x00000001 }, /* jne #1, drop */
{ 0x28, 0, 0, 0xfffff000 }, /* ldh #proto */
{ 0x15, 1, 0, 0x0000888e }, /* je #0x888e, keep */
{ 0x15, 0, 1, 0x000088c7 }, /* jne #0x88c7, drop */
{ 0x06, 0, 0, 0xffffffff }, /* keep: ret #-1 */
{ 0x06, 0, 0, 0000000000 }, /* drop: ret #0 */
};
const struct sock_fprog pae_fprog = {
.len = L_ARRAY_SIZE(pae_filter),
.filter = pae_filter
};
struct l_io *io;
int fd;
fd = socket(PF_PACKET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
htons(ETH_P_ALL));
if (fd < 0)
return NULL;
/*
* Here we modify the k value in the BPF program above to match the
* given ifindex. We do it this way instead of using bind to attach
* to a specific interface index to avoid having to re-open the fd
* whenever the device is powered down / up
*/
pae_filter[1].k = ifindex;
if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER,
&pae_fprog, sizeof(pae_fprog)) < 0)
goto error;
io = l_io_new(fd);
l_io_set_close_on_destroy(io, true);
return io;
error:
close(fd);
return NULL;
}
struct netdev *netdev_create_from_genl(struct l_genl_msg *msg,
const uint8_t *set_mac)
{
const char *ifname;
const uint8_t *ifaddr;
uint32_t ifindex;
uint32_t iftype;
uint64_t wdev;
uint32_t wiphy_id;
struct netdev *netdev;
struct wiphy *wiphy = NULL;
struct ifinfomsg *rtmmsg;
size_t bufsize;
const uint8_t action_neighbor_report_prefix[2] = { 0x05, 0x05 };
const uint8_t action_sa_query_resp_prefix[2] = { 0x08, 0x01 };
const uint8_t action_sa_query_req_prefix[2] = { 0x08, 0x00 };
const uint8_t action_ft_response_prefix[] = { 0x06, 0x02 };
const uint8_t action_qos_map_prefix[] = { 0x01, 0x04 };
struct l_io *pae_io = NULL;
if (nl80211_parse_attrs(msg, NL80211_ATTR_IFINDEX, &ifindex,
NL80211_ATTR_WDEV, &wdev,
NL80211_ATTR_IFNAME, &ifname,
NL80211_ATTR_WIPHY, &wiphy_id,
NL80211_ATTR_IFTYPE, &iftype,
NL80211_ATTR_MAC, &ifaddr,
NL80211_ATTR_UNSPEC) < 0) {
l_warn("Required attributes missing");
return NULL;
}
wiphy = wiphy_find(wiphy_id);
if (!wiphy) {
l_warn("No wiphy: %d", wiphy_id);
return NULL;
}
if (netdev_find(ifindex)) {
l_debug("Skipping duplicate netdev %s[%d]", ifname, ifindex);
return NULL;
}
if (!wiphy_has_ext_feature(wiphy,
NL80211_EXT_FEATURE_CONTROL_PORT_OVER_NL80211) ||
!pae_over_nl80211) {
pae_io = pae_open(ifindex);
if (!pae_io) {
l_error("Unable to open PAE interface");
return NULL;
}
}
netdev = l_new(struct netdev, 1);
netdev->index = ifindex;
netdev->wdev_id = wdev;
netdev->type = iftype;
netdev->rekey_offload_support = true;
memcpy(netdev->addr, ifaddr, sizeof(netdev->addr));
l_strlcpy(netdev->name, ifname, IFNAMSIZ);
netdev->wiphy = wiphy;
netdev->pae_over_nl80211 = pae_io == NULL;
if (set_mac)
memcpy(netdev->set_mac_once, set_mac, 6);
if (pae_io) {
netdev->pae_io = pae_io;
l_io_set_read_handler(netdev->pae_io, netdev_pae_read, netdev,
netdev_pae_destroy);
}
watchlist_init(&netdev->station_watches, NULL);
l_queue_push_tail(netdev_list, netdev);
l_debug("Created interface %s[%d %" PRIx64 "]", netdev->name,
netdev->index, netdev->wdev_id);
/* Query interface flags */
bufsize = NLMSG_ALIGN(sizeof(struct ifinfomsg));
rtmmsg = l_malloc(bufsize);
memset(rtmmsg, 0, bufsize);
rtmmsg->ifi_family = AF_UNSPEC;
rtmmsg->ifi_index = ifindex;
l_netlink_send(rtnl, RTM_GETLINK, 0, rtmmsg, bufsize,
netdev_getlink_cb, NULL, NULL);
l_free(rtmmsg);
/* Subscribe to Management -> Action -> RM -> Neighbor Report frames */
frame_watch_add(wdev, 0, 0x00d0, action_neighbor_report_prefix,
sizeof(action_neighbor_report_prefix),
netdev_neighbor_report_frame_event, netdev, NULL);
frame_watch_add(wdev, 0, 0x00d0, action_sa_query_resp_prefix,
sizeof(action_sa_query_resp_prefix),
netdev_sa_query_resp_frame_event, netdev, NULL);
frame_watch_add(wdev, 0, 0x00d0, action_sa_query_req_prefix,
sizeof(action_sa_query_req_prefix),
netdev_sa_query_req_frame_event, netdev, NULL);
frame_watch_add(wdev, 0, 0x00d0, action_ft_response_prefix,
sizeof(action_ft_response_prefix),
netdev_ft_response_frame_event, netdev, NULL);
if (wiphy_supports_qos_set_map(netdev->wiphy))
frame_watch_add(wdev, 0, 0x00d0, action_qos_map_prefix,
sizeof(action_qos_map_prefix),
netdev_qos_map_frame_event, netdev, NULL);
/* Set RSSI threshold for CQM notifications */
if (netdev->type == NL80211_IFTYPE_STATION)
netdev_cqm_rssi_update(netdev);
return netdev;
}
bool netdev_destroy(struct netdev *netdev)
{
if (!l_queue_remove(netdev_list, netdev))
return false;
netdev_free(netdev);
return true;
}
static void netdev_link_notify(uint16_t type, const void *data, uint32_t len,
void *user_data)
{
const struct ifinfomsg *ifi = data;
unsigned int bytes;
if (ifi->ifi_type != ARPHRD_ETHER)
return;
l_debug("event %u on ifindex %u", type, ifi->ifi_index);
bytes = len - NLMSG_ALIGN(sizeof(struct ifinfomsg));
switch (type) {
case RTM_NEWLINK:
netdev_newlink_notify(ifi, bytes);
break;
case RTM_DELLINK:
netdev_dellink_notify(ifi, bytes);
break;
}
}
uint32_t netdev_station_watch_add(struct netdev *netdev,
netdev_station_watch_func_t func, void *user_data)
{
return watchlist_add(&netdev->station_watches, func, user_data, NULL);
}
bool netdev_station_watch_remove(struct netdev *netdev, uint32_t id)
{
return watchlist_remove(&netdev->station_watches, id);
}
uint32_t netdev_watch_add(netdev_watch_func_t func,
void *user_data, netdev_destroy_func_t destroy)
{
return watchlist_add(&netdev_watches, func, user_data, destroy);
}
bool netdev_watch_remove(uint32_t id)
{
return watchlist_remove(&netdev_watches, id);
}
static int netdev_init(void)
{
struct l_genl *genl = iwd_get_genl();
const struct l_settings *settings = iwd_get_config();
const char *rand_addr_str;
if (rtnl)
return -EALREADY;
rtnl = iwd_get_rtnl();
if (!l_netlink_register(rtnl, RTNLGRP_LINK,
netdev_link_notify, NULL, NULL)) {
l_error("Failed to register for RTNL link notifications");
goto fail_netlink;
}
nl80211 = l_genl_family_new(genl, NL80211_GENL_NAME);
if (!nl80211) {
l_error("Failed to obtain nl80211");
goto fail_netlink;
}
if (!l_settings_get_int(settings, "General", "RoamThreshold",
&LOW_SIGNAL_THRESHOLD))
LOW_SIGNAL_THRESHOLD = -70;
if (!l_settings_get_bool(settings, "General", "ControlPortOverNL80211",
&pae_over_nl80211))
pae_over_nl80211 = true;
rand_addr_str = l_settings_get_value(settings, "General",
"AddressRandomization");
if (rand_addr_str && !strcmp(rand_addr_str, "network"))
mac_per_ssid = true;
watchlist_init(&netdev_watches, NULL);
netdev_list = l_queue_new();
__handshake_set_install_tk_func(netdev_set_tk);
__handshake_set_install_gtk_func(netdev_set_gtk);
__handshake_set_install_igtk_func(netdev_set_igtk);
__eapol_set_rekey_offload_func(netdev_set_rekey_offload);
__eapol_set_tx_packet_func(netdev_control_port_frame);
unicast_watch = l_genl_add_unicast_watch(genl, NL80211_GENL_NAME,
netdev_unicast_notify,
NULL, NULL);
if (!unicast_watch)
l_error("Registering for unicast notification failed");
if (!l_genl_family_register(nl80211, "mlme", netdev_mlme_notify,
NULL, NULL))
l_error("Registering for MLME notification failed");
return 0;
fail_netlink:
rtnl = NULL;
return -EIO;
}
static void netdev_exit(void)
{
struct l_genl *genl = iwd_get_genl();
if (!rtnl)
return;
l_genl_remove_unicast_watch(genl, unicast_watch);
watchlist_destroy(&netdev_watches);
l_genl_family_free(nl80211);
nl80211 = NULL;
rtnl = NULL;
}
void netdev_shutdown(void)
{
if (!rtnl)
return;
l_queue_foreach(netdev_list, netdev_shutdown_one, NULL);
l_queue_destroy(netdev_list, netdev_free);
netdev_list = NULL;
}
IWD_MODULE(netdev, netdev_init, netdev_exit);
IWD_MODULE_DEPENDS(netdev, eapol);
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