blob: d4e0b4065cbc4d76f534d984b87db7601061a2eb [file] [log] [blame]
/*
* SME code for cfg80211's connect emulation.
*
* Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
* Copyright (C) 2009 Intel Corporation. All rights reserved.
*/
#include <linux/etherdevice.h>
#include <linux/if_arp.h>
#include <linux/workqueue.h>
#include <net/cfg80211.h>
#include <net/rtnetlink.h>
#include "nl80211.h"
struct cfg80211_conn {
struct cfg80211_connect_params params;
/* these are sub-states of the _CONNECTING sme_state */
enum {
CFG80211_CONN_IDLE,
CFG80211_CONN_SCANNING,
CFG80211_CONN_SCAN_AGAIN,
CFG80211_CONN_AUTHENTICATE_NEXT,
CFG80211_CONN_AUTHENTICATING,
CFG80211_CONN_ASSOCIATE_NEXT,
CFG80211_CONN_ASSOCIATING,
} state;
u8 bssid[ETH_ALEN];
u8 *ie;
size_t ie_len;
bool auto_auth;
};
static int cfg80211_conn_scan(struct wireless_dev *wdev)
{
struct cfg80211_registered_device *drv = wiphy_to_dev(wdev->wiphy);
struct cfg80211_scan_request *request;
int n_channels, err;
ASSERT_RTNL();
if (drv->scan_req)
return -EBUSY;
if (wdev->conn->params.channel) {
n_channels = 1;
} else {
enum ieee80211_band band;
n_channels = 0;
for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
if (!wdev->wiphy->bands[band])
continue;
n_channels += wdev->wiphy->bands[band]->n_channels;
}
}
request = kzalloc(sizeof(*request) + sizeof(request->ssids[0]) +
sizeof(request->channels[0]) * n_channels,
GFP_KERNEL);
if (!request)
return -ENOMEM;
request->channels = (void *)((char *)request + sizeof(*request));
if (wdev->conn->params.channel)
request->channels[0] = wdev->conn->params.channel;
else {
int i = 0, j;
enum ieee80211_band band;
for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
if (!wdev->wiphy->bands[band])
continue;
for (j = 0; j < wdev->wiphy->bands[band]->n_channels;
i++, j++)
request->channels[i] =
&wdev->wiphy->bands[band]->channels[j];
}
}
request->n_channels = n_channels;
request->ssids = (void *)(request->channels + n_channels);
request->n_ssids = 1;
memcpy(request->ssids[0].ssid, wdev->conn->params.ssid,
wdev->conn->params.ssid_len);
request->ssids[0].ssid_len = wdev->conn->params.ssid_len;
request->ifidx = wdev->netdev->ifindex;
request->wiphy = &drv->wiphy;
drv->scan_req = request;
err = drv->ops->scan(wdev->wiphy, wdev->netdev, request);
if (!err) {
wdev->conn->state = CFG80211_CONN_SCANNING;
nl80211_send_scan_start(drv, wdev->netdev);
} else {
drv->scan_req = NULL;
kfree(request);
}
return err;
}
static int cfg80211_conn_do_work(struct wireless_dev *wdev)
{
struct cfg80211_registered_device *drv = wiphy_to_dev(wdev->wiphy);
union {
struct cfg80211_auth_request auth_req;
struct cfg80211_assoc_request assoc_req;
} u;
memset(&u, 0, sizeof(u));
if (!wdev->conn)
return 0;
switch (wdev->conn->state) {
case CFG80211_CONN_SCAN_AGAIN:
return cfg80211_conn_scan(wdev);
case CFG80211_CONN_AUTHENTICATE_NEXT:
u.auth_req.chan = wdev->conn->params.channel;
u.auth_req.peer_addr = wdev->conn->params.bssid;
u.auth_req.ssid = wdev->conn->params.ssid;
u.auth_req.ssid_len = wdev->conn->params.ssid_len;
u.auth_req.auth_type = wdev->conn->params.auth_type;
u.auth_req.ie = NULL;
u.auth_req.ie_len = 0;
wdev->conn->state = CFG80211_CONN_AUTHENTICATING;
BUG_ON(!drv->ops->auth);
return drv->ops->auth(wdev->wiphy, wdev->netdev, &u.auth_req);
case CFG80211_CONN_ASSOCIATE_NEXT:
u.assoc_req.chan = wdev->conn->params.channel;
u.assoc_req.peer_addr = wdev->conn->params.bssid;
u.assoc_req.ssid = wdev->conn->params.ssid;
u.assoc_req.ssid_len = wdev->conn->params.ssid_len;
u.assoc_req.ie = wdev->conn->params.ie;
u.assoc_req.ie_len = wdev->conn->params.ie_len;
u.assoc_req.use_mfp = false;
memcpy(&u.assoc_req.crypto, &wdev->conn->params.crypto,
sizeof(u.assoc_req.crypto));
wdev->conn->state = CFG80211_CONN_ASSOCIATING;
BUG_ON(!drv->ops->assoc);
return drv->ops->assoc(wdev->wiphy, wdev->netdev,
&u.assoc_req);
default:
return 0;
}
}
void cfg80211_conn_work(struct work_struct *work)
{
struct cfg80211_registered_device *drv =
container_of(work, struct cfg80211_registered_device, conn_work);
struct wireless_dev *wdev;
rtnl_lock();
mutex_lock(&drv->devlist_mtx);
list_for_each_entry(wdev, &drv->netdev_list, list) {
if (!netif_running(wdev->netdev))
continue;
if (wdev->sme_state != CFG80211_SME_CONNECTING)
continue;
if (cfg80211_conn_do_work(wdev))
cfg80211_connect_result(wdev->netdev,
wdev->conn->params.bssid,
NULL, 0, NULL, 0,
WLAN_STATUS_UNSPECIFIED_FAILURE,
GFP_ATOMIC);
}
mutex_unlock(&drv->devlist_mtx);
rtnl_unlock();
}
static bool cfg80211_get_conn_bss(struct wireless_dev *wdev)
{
struct cfg80211_registered_device *drv = wiphy_to_dev(wdev->wiphy);
struct cfg80211_bss *bss;
u16 capa = WLAN_CAPABILITY_ESS;
if (wdev->conn->params.privacy)
capa |= WLAN_CAPABILITY_PRIVACY;
bss = cfg80211_get_bss(wdev->wiphy, NULL, wdev->conn->params.bssid,
wdev->conn->params.ssid,
wdev->conn->params.ssid_len,
WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
capa);
if (!bss)
return false;
memcpy(wdev->conn->bssid, bss->bssid, ETH_ALEN);
wdev->conn->params.bssid = wdev->conn->bssid;
wdev->conn->params.channel = bss->channel;
wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
schedule_work(&drv->conn_work);
cfg80211_put_bss(bss);
return true;
}
void cfg80211_sme_scan_done(struct net_device *dev)
{
struct wireless_dev *wdev = dev->ieee80211_ptr;
struct cfg80211_registered_device *drv = wiphy_to_dev(wdev->wiphy);
if (wdev->sme_state != CFG80211_SME_CONNECTING)
return;
if (WARN_ON(!wdev->conn))
return;
if (wdev->conn->state != CFG80211_CONN_SCANNING &&
wdev->conn->state != CFG80211_CONN_SCAN_AGAIN)
return;
if (!cfg80211_get_conn_bss(wdev)) {
/* not found */
if (wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)
schedule_work(&drv->conn_work);
else
cfg80211_connect_result(dev, wdev->conn->params.bssid,
NULL, 0, NULL, 0,
WLAN_STATUS_UNSPECIFIED_FAILURE,
GFP_ATOMIC);
return;
}
}
void cfg80211_sme_rx_auth(struct net_device *dev, const u8 *buf, size_t len)
{
struct wireless_dev *wdev = dev->ieee80211_ptr;
struct wiphy *wiphy = wdev->wiphy;
struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
u16 status_code = le16_to_cpu(mgmt->u.auth.status_code);
/* should only RX auth frames when connecting */
if (wdev->sme_state != CFG80211_SME_CONNECTING)
return;
if (WARN_ON(!wdev->conn))
return;
if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG &&
wdev->conn->auto_auth &&
wdev->conn->params.auth_type != NL80211_AUTHTYPE_NETWORK_EAP) {
/* select automatically between only open, shared, leap */
switch (wdev->conn->params.auth_type) {
case NL80211_AUTHTYPE_OPEN_SYSTEM:
wdev->conn->params.auth_type =
NL80211_AUTHTYPE_SHARED_KEY;
break;
case NL80211_AUTHTYPE_SHARED_KEY:
wdev->conn->params.auth_type =
NL80211_AUTHTYPE_NETWORK_EAP;
break;
default:
/* huh? */
wdev->conn->params.auth_type =
NL80211_AUTHTYPE_OPEN_SYSTEM;
break;
}
wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
schedule_work(&rdev->conn_work);
} else if (status_code != WLAN_STATUS_SUCCESS)
wdev->sme_state = CFG80211_SME_IDLE;
else if (wdev->sme_state == CFG80211_SME_CONNECTING &&
wdev->conn->state == CFG80211_CONN_AUTHENTICATING) {
wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
schedule_work(&rdev->conn_work);
}
}
static void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
const u8 *req_ie, size_t req_ie_len,
const u8 *resp_ie, size_t resp_ie_len,
u16 status, bool wextev, gfp_t gfp)
{
struct wireless_dev *wdev = dev->ieee80211_ptr;
struct cfg80211_bss *bss;
#ifdef CONFIG_WIRELESS_EXT
union iwreq_data wrqu;
#endif
if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
return;
if (wdev->sme_state == CFG80211_SME_CONNECTED)
nl80211_send_roamed(wiphy_to_dev(wdev->wiphy), dev,
bssid, req_ie, req_ie_len,
resp_ie, resp_ie_len, gfp);
else
nl80211_send_connect_result(wiphy_to_dev(wdev->wiphy), dev,
bssid, req_ie, req_ie_len,
resp_ie, resp_ie_len,
status, gfp);
#ifdef CONFIG_WIRELESS_EXT
if (wextev) {
if (req_ie && status == WLAN_STATUS_SUCCESS) {
memset(&wrqu, 0, sizeof(wrqu));
wrqu.data.length = req_ie_len;
wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu, req_ie);
}
if (resp_ie && status == WLAN_STATUS_SUCCESS) {
memset(&wrqu, 0, sizeof(wrqu));
wrqu.data.length = resp_ie_len;
wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu, resp_ie);
}
memset(&wrqu, 0, sizeof(wrqu));
wrqu.ap_addr.sa_family = ARPHRD_ETHER;
if (bssid && status == WLAN_STATUS_SUCCESS)
memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
}
#endif
if (status == WLAN_STATUS_SUCCESS &&
wdev->sme_state == CFG80211_SME_IDLE) {
wdev->sme_state = CFG80211_SME_CONNECTED;
return;
}
if (wdev->sme_state != CFG80211_SME_CONNECTING)
return;
if (wdev->current_bss) {
cfg80211_unhold_bss(wdev->current_bss);
cfg80211_put_bss(wdev->current_bss);
wdev->current_bss = NULL;
}
if (status == WLAN_STATUS_SUCCESS) {
bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
wdev->ssid, wdev->ssid_len,
WLAN_CAPABILITY_ESS,
WLAN_CAPABILITY_ESS);
if (WARN_ON(!bss))
return;
cfg80211_hold_bss(bss);
wdev->current_bss = bss;
wdev->sme_state = CFG80211_SME_CONNECTED;
} else {
wdev->sme_state = CFG80211_SME_IDLE;
}
if (wdev->conn)
wdev->conn->state = CFG80211_CONN_IDLE;
}
void cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
const u8 *req_ie, size_t req_ie_len,
const u8 *resp_ie, size_t resp_ie_len,
u16 status, gfp_t gfp)
{
bool wextev = status == WLAN_STATUS_SUCCESS;
__cfg80211_connect_result(dev, bssid, req_ie, req_ie_len, resp_ie, resp_ie_len, status, wextev, gfp);
}
EXPORT_SYMBOL(cfg80211_connect_result);
void cfg80211_roamed(struct net_device *dev, const u8 *bssid,
const u8 *req_ie, size_t req_ie_len,
const u8 *resp_ie, size_t resp_ie_len, gfp_t gfp)
{
struct wireless_dev *wdev = dev->ieee80211_ptr;
struct cfg80211_bss *bss;
#ifdef CONFIG_WIRELESS_EXT
union iwreq_data wrqu;
#endif
if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
return;
if (WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED))
return;
/* internal error -- how did we get to CONNECTED w/o BSS? */
if (WARN_ON(!wdev->current_bss)) {
return;
}
cfg80211_unhold_bss(wdev->current_bss);
cfg80211_put_bss(wdev->current_bss);
wdev->current_bss = NULL;
bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
wdev->ssid, wdev->ssid_len,
WLAN_CAPABILITY_ESS, WLAN_CAPABILITY_ESS);
if (WARN_ON(!bss))
return;
cfg80211_hold_bss(bss);
wdev->current_bss = bss;
nl80211_send_roamed(wiphy_to_dev(wdev->wiphy), dev, bssid,
req_ie, req_ie_len, resp_ie, resp_ie_len, gfp);
#ifdef CONFIG_WIRELESS_EXT
if (req_ie) {
memset(&wrqu, 0, sizeof(wrqu));
wrqu.data.length = req_ie_len;
wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu, req_ie);
}
if (resp_ie) {
memset(&wrqu, 0, sizeof(wrqu));
wrqu.data.length = resp_ie_len;
wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu, resp_ie);
}
memset(&wrqu, 0, sizeof(wrqu));
wrqu.ap_addr.sa_family = ARPHRD_ETHER;
memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
#endif
}
EXPORT_SYMBOL(cfg80211_roamed);
void __cfg80211_disconnected(struct net_device *dev, gfp_t gfp, u8 *ie,
size_t ie_len, u16 reason, bool from_ap)
{
struct wireless_dev *wdev = dev->ieee80211_ptr;
#ifdef CONFIG_WIRELESS_EXT
union iwreq_data wrqu;
#endif
if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
return;
if (WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED))
return;
if (wdev->current_bss) {
cfg80211_unhold_bss(wdev->current_bss);
cfg80211_put_bss(wdev->current_bss);
}
wdev->current_bss = NULL;
wdev->sme_state = CFG80211_SME_IDLE;
if (wdev->conn) {
kfree(wdev->conn->ie);
wdev->conn->ie = NULL;
}
nl80211_send_disconnected(wiphy_to_dev(wdev->wiphy), dev,
reason, ie, ie_len, from_ap, gfp);
#ifdef CONFIG_WIRELESS_EXT
memset(&wrqu, 0, sizeof(wrqu));
wrqu.ap_addr.sa_family = ARPHRD_ETHER;
wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
#endif
}
void cfg80211_disconnected(struct net_device *dev, u16 reason,
u8 *ie, size_t ie_len, gfp_t gfp)
{
__cfg80211_disconnected(dev, gfp, ie, ie_len, reason, true);
}
EXPORT_SYMBOL(cfg80211_disconnected);
int cfg80211_connect(struct cfg80211_registered_device *rdev,
struct net_device *dev,
struct cfg80211_connect_params *connect)
{
int err;
struct wireless_dev *wdev = dev->ieee80211_ptr;
if (wdev->sme_state != CFG80211_SME_IDLE)
return -EALREADY;
if (!rdev->ops->connect) {
if (!rdev->ops->auth || !rdev->ops->assoc)
return -EOPNOTSUPP;
if (!wdev->conn) {
wdev->conn = kzalloc(sizeof(*wdev->conn), GFP_KERNEL);
if (!wdev->conn)
return -ENOMEM;
} else
memset(wdev->conn, 0, sizeof(*wdev->conn));
/*
* Copy all parameters, and treat explicitly IEs, BSSID, SSID.
*/
memcpy(&wdev->conn->params, connect, sizeof(*connect));
if (connect->bssid) {
wdev->conn->params.bssid = wdev->conn->bssid;
memcpy(wdev->conn->bssid, connect->bssid, ETH_ALEN);
}
if (connect->ie) {
wdev->conn->ie = kmemdup(connect->ie, connect->ie_len,
GFP_KERNEL);
wdev->conn->params.ie = wdev->conn->ie;
if (!wdev->conn->ie)
return -ENOMEM;
}
if (connect->auth_type == NL80211_AUTHTYPE_AUTOMATIC) {
wdev->conn->auto_auth = true;
/* start with open system ... should mostly work */
wdev->conn->params.auth_type =
NL80211_AUTHTYPE_OPEN_SYSTEM;
} else {
wdev->conn->auto_auth = false;
}
memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
wdev->ssid_len = connect->ssid_len;
wdev->conn->params.ssid = wdev->ssid;
wdev->conn->params.ssid_len = connect->ssid_len;
/* don't care about result -- but fill bssid & channel */
if (!wdev->conn->params.bssid || !wdev->conn->params.channel)
cfg80211_get_conn_bss(wdev);
wdev->sme_state = CFG80211_SME_CONNECTING;
/* we're good if we have both BSSID and channel */
if (wdev->conn->params.bssid && wdev->conn->params.channel) {
wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
err = cfg80211_conn_do_work(wdev);
} else {
/* otherwise we'll need to scan for the AP first */
err = cfg80211_conn_scan(wdev);
/*
* If we can't scan right now, then we need to scan again
* after the current scan finished, since the parameters
* changed (unless we find a good AP anyway).
*/
if (err == -EBUSY) {
err = 0;
wdev->conn->state = CFG80211_CONN_SCAN_AGAIN;
}
}
if (err)
wdev->sme_state = CFG80211_SME_IDLE;
return err;
} else {
wdev->sme_state = CFG80211_SME_CONNECTING;
err = rdev->ops->connect(&rdev->wiphy, dev, connect);
if (err) {
wdev->sme_state = CFG80211_SME_IDLE;
return err;
}
memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
wdev->ssid_len = connect->ssid_len;
return 0;
}
}
int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
struct net_device *dev, u16 reason, bool wextev)
{
struct wireless_dev *wdev = dev->ieee80211_ptr;
int err;
if (wdev->sme_state == CFG80211_SME_IDLE)
return -EINVAL;
if (!rdev->ops->disconnect) {
struct cfg80211_deauth_request deauth;
u8 bssid[ETH_ALEN];
/* internal bug. */
if (WARN_ON(!wdev->conn))
return -EINVAL;
if (wdev->sme_state == CFG80211_SME_CONNECTING &&
(wdev->conn->state == CFG80211_CONN_SCANNING ||
wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)) {
wdev->sme_state = CFG80211_SME_IDLE;
return 0;
}
if (!rdev->ops->deauth)
return -EOPNOTSUPP;
memset(&deauth, 0, sizeof(deauth));
/* wdev->conn->params.bssid must be set if > SCANNING */
memcpy(bssid, wdev->conn->params.bssid, ETH_ALEN);
deauth.peer_addr = bssid;
deauth.reason_code = reason;
err = rdev->ops->deauth(&rdev->wiphy, dev, &deauth);
if (err)
return err;
} else {
err = rdev->ops->disconnect(&rdev->wiphy, dev, reason);
if (err)
return err;
}
if (wdev->sme_state == CFG80211_SME_CONNECTED)
__cfg80211_disconnected(dev, GFP_KERNEL, NULL, 0, 0, false);
else if (wdev->sme_state == CFG80211_SME_CONNECTING)
__cfg80211_connect_result(dev, NULL, NULL, 0, NULL, 0,
WLAN_STATUS_UNSPECIFIED_FAILURE,
wextev, GFP_KERNEL);
return 0;
}