Release 4.14 net/wireless/sme.c

// SPDX-License-Identifier: GPL-2.0
/*
 * SME code for cfg80211
 * both driver SME event handling and the SME implementation
 * (for nl80211's connect() and wext)
 *
 * Copyright 2009       Johannes Berg <johannes@sipsolutions.net>
 * Copyright (C) 2009   Intel Corporation. All rights reserved.
 * Copyright 2017       Intel Deutschland GmbH
 */

#include <linux/etherdevice.h>
#include <linux/if_arp.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/wireless.h>
#include <linux/export.h>
#include <net/iw_handler.h>
#include <net/cfg80211.h>
#include <net/rtnetlink.h>
#include "nl80211.h"
#include "reg.h"
#include "rdev-ops.h"

/*
 * Software SME in cfg80211, using auth/assoc/deauth calls to the
 * driver. This is is for implementing nl80211's connect/disconnect
 * and wireless extensions (if configured.)
 */


struct cfg80211_conn {
	
struct cfg80211_connect_params params;
	/* these are sub-states of the _CONNECTING sme_state */
	enum {
		
CFG80211_CONN_SCANNING,
		
CFG80211_CONN_SCAN_AGAIN,
		
CFG80211_CONN_AUTHENTICATE_NEXT,
		
CFG80211_CONN_AUTHENTICATING,
		
CFG80211_CONN_AUTH_FAILED_TIMEOUT,
		
CFG80211_CONN_ASSOCIATE_NEXT,
		
CFG80211_CONN_ASSOCIATING,
		
CFG80211_CONN_ASSOC_FAILED,
		
CFG80211_CONN_ASSOC_FAILED_TIMEOUT,
		
CFG80211_CONN_DEAUTH,
		
CFG80211_CONN_ABANDON,
		
CFG80211_CONN_CONNECTED,
        } 
state;
	

u8 bssid[ETH_ALEN], prev_bssid[ETH_ALEN];
	
const u8 *ie;
	
size_t ie_len;
	

bool auto_auth, prev_bssid_valid;
};



static void cfg80211_sme_free(struct wireless_dev *wdev)
{
	if (!wdev->conn)
		return;

	kfree(wdev->conn->ie);
	kfree(wdev->conn);
	wdev->conn = NULL;
}

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static int cfg80211_conn_scan(struct wireless_dev *wdev)
{
	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
	struct cfg80211_scan_request *request;
	int n_channels, err;

	ASSERT_RTNL();
	ASSERT_WDEV_LOCK(wdev);

	if (rdev->scan_req || rdev->scan_msg)
		return -EBUSY;

	if (wdev->conn->params.channel)
		n_channels = 1;
	else
		n_channels = ieee80211_get_num_supported_channels(wdev->wiphy);

	request = kzalloc(sizeof(*request) + sizeof(request->ssids[0]) +
			  sizeof(request->channels[0]) * n_channels,
			  GFP_KERNEL);
	if (!request)
		return -ENOMEM;

	if (wdev->conn->params.channel) {
		enum nl80211_band band = wdev->conn->params.channel->band;
		struct ieee80211_supported_band *sband =
			wdev->wiphy->bands[band];

		if (!sband) {
			kfree(request);
			return -EINVAL;
		}
		request->channels[0] = wdev->conn->params.channel;
		request->rates[band] = (1 << sband->n_bitrates) - 1;
	} else {
		int i = 0, j;
		enum nl80211_band band;
		struct ieee80211_supported_band *bands;
		struct ieee80211_channel *channel;

		for (band = 0; band < NUM_NL80211_BANDS; band++) {
			bands = wdev->wiphy->bands[band];
			if (!bands)
				continue;
			for (j = 0; j < bands->n_channels; j++) {
				channel = &bands->channels[j];
				if (channel->flags & IEEE80211_CHAN_DISABLED)
					continue;
				request->channels[i++] = channel;
			}
			request->rates[band] = (1 << bands->n_bitrates) - 1;
		}
		n_channels = i;
	}
	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;

	eth_broadcast_addr(request->bssid);

	request->wdev = wdev;
	request->wiphy = &rdev->wiphy;
	request->scan_start = jiffies;

	rdev->scan_req = request;

	err = rdev_scan(rdev, request);
	if (!err) {
		wdev->conn->state = CFG80211_CONN_SCANNING;
		nl80211_send_scan_start(rdev, wdev);
		dev_hold(wdev->netdev);
	} else {
		rdev->scan_req = NULL;
		kfree(request);
	}
	return err;
}

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6
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static int cfg80211_conn_do_work(struct wireless_dev *wdev,
				 enum nl80211_timeout_reason *treason)
{
	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
	struct cfg80211_connect_params *params;
	struct cfg80211_assoc_request req = {};
	int err;

	ASSERT_WDEV_LOCK(wdev);

	if (!wdev->conn)
		return 0;

	params = &wdev->conn->params;

	switch (wdev->conn->state) {
	case CFG80211_CONN_SCANNING:
		/* didn't find it during scan ... */
		return -ENOENT;
	case CFG80211_CONN_SCAN_AGAIN:
		return cfg80211_conn_scan(wdev);
	case CFG80211_CONN_AUTHENTICATE_NEXT:
		if (WARN_ON(!rdev->ops->auth))
			return -EOPNOTSUPP;
		wdev->conn->state = CFG80211_CONN_AUTHENTICATING;
		return cfg80211_mlme_auth(rdev, wdev->netdev,
					  params->channel, params->auth_type,
					  params->bssid,
					  params->ssid, params->ssid_len,
					  NULL, 0,
					  params->key, params->key_len,
					  params->key_idx, NULL, 0);
	case CFG80211_CONN_AUTH_FAILED_TIMEOUT:
		*treason = NL80211_TIMEOUT_AUTH;
		return -ENOTCONN;
	case CFG80211_CONN_ASSOCIATE_NEXT:
		if (WARN_ON(!rdev->ops->assoc))
			return -EOPNOTSUPP;
		wdev->conn->state = CFG80211_CONN_ASSOCIATING;
		if (wdev->conn->prev_bssid_valid)
			req.prev_bssid = wdev->conn->prev_bssid;
		req.ie = params->ie;
		req.ie_len = params->ie_len;
		req.use_mfp = params->mfp != NL80211_MFP_NO;
		req.crypto = params->crypto;
		req.flags = params->flags;
		req.ht_capa = params->ht_capa;
		req.ht_capa_mask = params->ht_capa_mask;
		req.vht_capa = params->vht_capa;
		req.vht_capa_mask = params->vht_capa_mask;

		err = cfg80211_mlme_assoc(rdev, wdev->netdev, params->channel,
					  params->bssid, params->ssid,
					  params->ssid_len, &req);
		if (err)
			cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
					     NULL, 0,
					     WLAN_REASON_DEAUTH_LEAVING,
					     false);
		return err;
	case CFG80211_CONN_ASSOC_FAILED_TIMEOUT:
		*treason = NL80211_TIMEOUT_ASSOC;
		/* fall through */
	case CFG80211_CONN_ASSOC_FAILED:
		cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
				     NULL, 0,
				     WLAN_REASON_DEAUTH_LEAVING, false);
		return -ENOTCONN;
	case CFG80211_CONN_DEAUTH:
		cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
				     NULL, 0,
				     WLAN_REASON_DEAUTH_LEAVING, false);
		/* fall through */
	case CFG80211_CONN_ABANDON:
		/* free directly, disconnected event already sent */
		cfg80211_sme_free(wdev);
		return 0;
	default:
		return 0;
	}
}

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void cfg80211_conn_work(struct work_struct *work)
{
	struct cfg80211_registered_device *rdev =
		container_of(work, struct cfg80211_registered_device, conn_work);
	struct wireless_dev *wdev;
	u8 bssid_buf[ETH_ALEN], *bssid = NULL;
	enum nl80211_timeout_reason treason;

	rtnl_lock();

	list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
		if (!wdev->netdev)
			continue;

		wdev_lock(wdev);
		if (!netif_running(wdev->netdev)) {
			wdev_unlock(wdev);
			continue;
		}
		if (!wdev->conn ||
		    wdev->conn->state == CFG80211_CONN_CONNECTED) {
			wdev_unlock(wdev);
			continue;
		}
		if (wdev->conn->params.bssid) {
			memcpy(bssid_buf, wdev->conn->params.bssid, ETH_ALEN);
			bssid = bssid_buf;
		}
		treason = NL80211_TIMEOUT_UNSPECIFIED;
		if (cfg80211_conn_do_work(wdev, &treason)) {
			struct cfg80211_connect_resp_params cr;

			memset(&cr, 0, sizeof(cr));
			cr.status = -1;
			cr.bssid = bssid;
			cr.timeout_reason = treason;
			__cfg80211_connect_result(wdev->netdev, &cr, false);
		}
		wdev_unlock(wdev);
	}

	rtnl_unlock();
}

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/* Returned bss is reference counted and must be cleaned up appropriately. */


static struct cfg80211_bss *cfg80211_get_conn_bss(struct wireless_dev *wdev)
{
	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
	struct cfg80211_bss *bss;

	ASSERT_WDEV_LOCK(wdev);

	bss = cfg80211_get_bss(wdev->wiphy, wdev->conn->params.channel,
			       wdev->conn->params.bssid,
			       wdev->conn->params.ssid,
			       wdev->conn->params.ssid_len,
			       wdev->conn_bss_type,
			       IEEE80211_PRIVACY(wdev->conn->params.privacy));
	if (!bss)
		return NULL;

	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(&rdev->conn_work);

	return bss;
}

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static void __cfg80211_sme_scan_done(struct net_device *dev)
{
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
	struct cfg80211_bss *bss;

	ASSERT_WDEV_LOCK(wdev);

	if (!wdev->conn)
		return;

	if (wdev->conn->state != CFG80211_CONN_SCANNING &&
	    wdev->conn->state != CFG80211_CONN_SCAN_AGAIN)
		return;

	bss = cfg80211_get_conn_bss(wdev);
	if (bss)
		cfg80211_put_bss(&rdev->wiphy, bss);
	else
		schedule_work(&rdev->conn_work);
}

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void cfg80211_sme_scan_done(struct net_device *dev)
{
	struct wireless_dev *wdev = dev->ieee80211_ptr;

	wdev_lock(wdev);
	__cfg80211_sme_scan_done(dev);
	wdev_unlock(wdev);
}

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void cfg80211_sme_rx_auth(struct wireless_dev *wdev, const u8 *buf, size_t len)
{
	struct wiphy *wiphy = wdev->wiphy;
	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
	u16 status_code = le16_to_cpu(mgmt->u.auth.status_code);

	ASSERT_WDEV_LOCK(wdev);

	if (!wdev->conn || wdev->conn->state == CFG80211_CONN_CONNECTED)
		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:
			if (wdev->connect_keys)
				wdev->conn->params.auth_type =
					NL80211_AUTHTYPE_SHARED_KEY;
			else
				wdev->conn->params.auth_type =
					NL80211_AUTHTYPE_NETWORK_EAP;
			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) {
		struct cfg80211_connect_resp_params cr;

		memset(&cr, 0, sizeof(cr));
		cr.status = status_code;
		cr.bssid = mgmt->bssid;
		cr.timeout_reason = NL80211_TIMEOUT_UNSPECIFIED;
		__cfg80211_connect_result(wdev->netdev, &cr, false);
	} else if (wdev->conn->state == CFG80211_CONN_AUTHENTICATING) {
		wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
		schedule_work(&rdev->conn_work);
	}
}

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bool cfg80211_sme_rx_assoc_resp(struct wireless_dev *wdev, u16 status)
{
	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);

	if (!wdev->conn)
		return false;

	if (status == WLAN_STATUS_SUCCESS) {
		wdev->conn->state = CFG80211_CONN_CONNECTED;
		return false;
	}

	if (wdev->conn->prev_bssid_valid) {
		/*
                 * Some stupid APs don't accept reassoc, so we
                 * need to fall back to trying regular assoc;
                 * return true so no event is sent to userspace.
                 */
		wdev->conn->prev_bssid_valid = false;
		wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
		schedule_work(&rdev->conn_work);
		return true;
	}

	wdev->conn->state = CFG80211_CONN_ASSOC_FAILED;
	schedule_work(&rdev->conn_work);
	return false;
}

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void cfg80211_sme_deauth(struct wireless_dev *wdev)
{
	cfg80211_sme_free(wdev);
}

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void cfg80211_sme_auth_timeout(struct wireless_dev *wdev)
{
	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);

	if (!wdev->conn)
		return;

	wdev->conn->state = CFG80211_CONN_AUTH_FAILED_TIMEOUT;
	schedule_work(&rdev->conn_work);
}

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void cfg80211_sme_disassoc(struct wireless_dev *wdev)
{
	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);

	if (!wdev->conn)
		return;

	wdev->conn->state = CFG80211_CONN_DEAUTH;
	schedule_work(&rdev->conn_work);
}

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void cfg80211_sme_assoc_timeout(struct wireless_dev *wdev)
{
	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);

	if (!wdev->conn)
		return;

	wdev->conn->state = CFG80211_CONN_ASSOC_FAILED_TIMEOUT;
	schedule_work(&rdev->conn_work);
}

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void cfg80211_sme_abandon_assoc(struct wireless_dev *wdev)
{
	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);

	if (!wdev->conn)
		return;

	wdev->conn->state = CFG80211_CONN_ABANDON;
	schedule_work(&rdev->conn_work);
}

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static int cfg80211_sme_get_conn_ies(struct wireless_dev *wdev,
				     const u8 *ies, size_t ies_len,
				     const u8 **out_ies, size_t *out_ies_len)
{
	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
	u8 *buf;
	size_t offs;

	if (!rdev->wiphy.extended_capabilities_len ||
	    (ies && cfg80211_find_ie(WLAN_EID_EXT_CAPABILITY, ies, ies_len))) {
		*out_ies = kmemdup(ies, ies_len, GFP_KERNEL);
		if (!*out_ies)
			return -ENOMEM;
		*out_ies_len = ies_len;
		return 0;
	}

	buf = kmalloc(ies_len + rdev->wiphy.extended_capabilities_len + 2,
		      GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	if (ies_len) {
		static const u8 before_extcapa[] = {
			/* not listing IEs expected to be created by driver */
			WLAN_EID_RSN,
			WLAN_EID_QOS_CAPA,
			WLAN_EID_RRM_ENABLED_CAPABILITIES,
			WLAN_EID_MOBILITY_DOMAIN,
			WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
			WLAN_EID_BSS_COEX_2040,
                };

		offs = ieee80211_ie_split(ies, ies_len, before_extcapa,
					  ARRAY_SIZE(before_extcapa), 0);
		memcpy(buf, ies, offs);
		/* leave a whole for extended capabilities IE */
		memcpy(buf + offs + rdev->wiphy.extended_capabilities_len + 2,
		       ies + offs, ies_len - offs);
	} else {
		offs = 0;
	}

	/* place extended capabilities IE (with only driver capabilities) */
	buf[offs] = WLAN_EID_EXT_CAPABILITY;
	buf[offs + 1] = rdev->wiphy.extended_capabilities_len;
	memcpy(buf + offs + 2,
	       rdev->wiphy.extended_capabilities,
	       rdev->wiphy.extended_capabilities_len);

	*out_ies = buf;
	*out_ies_len = ies_len + rdev->wiphy.extended_capabilities_len + 2;

	return 0;
}

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static int cfg80211_sme_connect(struct wireless_dev *wdev,
				struct cfg80211_connect_params *connect,
				const u8 *prev_bssid)
{
	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
	struct cfg80211_bss *bss;
	int err;

	if (!rdev->ops->auth || !rdev->ops->assoc)
		return -EOPNOTSUPP;

	if (wdev->current_bss) {
		cfg80211_unhold_bss(wdev->current_bss);
		cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
		wdev->current_bss = NULL;

		cfg80211_sme_free(wdev);
	}

	if (WARN_ON(wdev->conn))
		return -EINPROGRESS;

	wdev->conn = kzalloc(sizeof(*wdev->conn), GFP_KERNEL);
	if (!wdev->conn)
		return -ENOMEM;

	/*
         * 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 (cfg80211_sme_get_conn_ies(wdev, connect->ie, connect->ie_len,
				      &wdev->conn->ie,
				      &wdev->conn->params.ie_len)) {
		kfree(wdev->conn);
		wdev->conn = NULL;
		return -ENOMEM;
	}
	wdev->conn->params.ie = wdev->conn->ie;

	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;
	}

	wdev->conn->params.ssid = wdev->ssid;
	wdev->conn->params.ssid_len = wdev->ssid_len;

	/* see if we have the bss already */
	bss = cfg80211_get_conn_bss(wdev);

	if (prev_bssid) {
		memcpy(wdev->conn->prev_bssid, prev_bssid, ETH_ALEN);
		wdev->conn->prev_bssid_valid = true;
	}

	/* we're good if we have a matching bss struct */
	if (bss) {
		enum nl80211_timeout_reason treason;

		err = cfg80211_conn_do_work(wdev, &treason);
		cfg80211_put_bss(wdev->wiphy, bss);
	} 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)
		cfg80211_sme_free(wdev);

	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Johannes Berg
371
85.09%
16
66.67%
Jouni Malinen
38
8.72%
2
8.33%
Luis R. Rodriguez
10
2.29%
2
8.33%
David Kilroy
8
1.83%
1
4.17%
Purushottam Kushwaha
7
1.61%
1
4.17%
Zhao, Gang
2
0.46%
2
8.33%
Total
436
100.00%
24
100.00%



static int cfg80211_sme_disconnect(struct wireless_dev *wdev, u16 reason)
{
	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
	int err;

	if (!wdev->conn)
		return 0;

	if (!rdev->ops->deauth)
		return -EOPNOTSUPP;

	if (wdev->conn->state == CFG80211_CONN_SCANNING ||
	    wdev->conn->state == CFG80211_CONN_SCAN_AGAIN) {
		err = 0;
		goto out;
	}

	/* wdev->conn->params.bssid must be set if > SCANNING */
	err = cfg80211_mlme_deauth(rdev, wdev->netdev,
				   wdev->conn->params.bssid,
				   NULL, 0, reason, false);
 out:
	cfg80211_sme_free(wdev);
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Johannes Berg
111
94.87%
5
71.43%
Nishant Sarmukadam
5
4.27%
1
14.29%
Zhao, Gang
1
0.85%
1
14.29%
Total
117
100.00%
7
100.00%

/*
 * code shared for in-device and software SME
 */



static bool cfg80211_is_all_idle(void)
{
	struct cfg80211_registered_device *rdev;
	struct wireless_dev *wdev;
	bool is_all_idle = true;