Release 4.11 net/wireless/mlme.c

/*
 * cfg80211 MLME SAP interface
 *
 * Copyright (c) 2009, Jouni Malinen <j@w1.fi>
 * Copyright (c) 2015           Intel Deutschland GmbH
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/etherdevice.h>
#include <linux/netdevice.h>
#include <linux/nl80211.h>
#include <linux/slab.h>
#include <linux/wireless.h>
#include <net/cfg80211.h>
#include <net/iw_handler.h>
#include "core.h"
#include "nl80211.h"
#include "rdev-ops.h"




void cfg80211_rx_assoc_resp(struct net_device *dev, struct cfg80211_bss *bss,
			    const u8 *buf, size_t len, int uapsd_queues)
{
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	struct wiphy *wiphy = wdev->wiphy;
	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
	u8 *ie = mgmt->u.assoc_resp.variable;
	int ieoffs = offsetof(struct ieee80211_mgmt, u.assoc_resp.variable);
	u16 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);

	trace_cfg80211_send_rx_assoc(dev, bss);

	/*
         * This is a bit of a hack, we don't notify userspace of
         * a (re-)association reply if we tried to send a reassoc
         * and got a reject -- we only try again with an assoc
         * frame instead of reassoc.
         */
	if (cfg80211_sme_rx_assoc_resp(wdev, status_code)) {
		cfg80211_unhold_bss(bss_from_pub(bss));
		cfg80211_put_bss(wiphy, bss);
		return;
	}

	nl80211_send_rx_assoc(rdev, dev, buf, len, GFP_KERNEL, uapsd_queues);
	/* update current_bss etc., consumes the bss reference */
	__cfg80211_connect_result(dev, mgmt->bssid, NULL, 0, ie, len - ieoffs,
				  status_code,
				  status_code == WLAN_STATUS_SUCCESS, bss,
				  NL80211_TIMEOUT_UNSPECIFIED);
}
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EXPORT_SYMBOL(cfg80211_rx_assoc_resp);



static void cfg80211_process_auth(struct wireless_dev *wdev,
				  const u8 *buf, size_t len)
{
	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);

	nl80211_send_rx_auth(rdev, wdev->netdev, buf, len, GFP_KERNEL);
	cfg80211_sme_rx_auth(wdev, buf, len);
}

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static void cfg80211_process_deauth(struct wireless_dev *wdev,
				    const u8 *buf, size_t len)
{
	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
	const u8 *bssid = mgmt->bssid;
	u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
	bool from_ap = !ether_addr_equal(mgmt->sa, wdev->netdev->dev_addr);

	nl80211_send_deauth(rdev, wdev->netdev, buf, len, GFP_KERNEL);

	if (!wdev->current_bss ||
	    !ether_addr_equal(wdev->current_bss->pub.bssid, bssid))
		return;

	__cfg80211_disconnected(wdev->netdev, NULL, 0, reason_code, from_ap);
	cfg80211_sme_deauth(wdev);
}

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static void cfg80211_process_disassoc(struct wireless_dev *wdev,
				      const u8 *buf, size_t len)
{
	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
	const u8 *bssid = mgmt->bssid;
	u16 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
	bool from_ap = !ether_addr_equal(mgmt->sa, wdev->netdev->dev_addr);

	nl80211_send_disassoc(rdev, wdev->netdev, buf, len, GFP_KERNEL);

	if (WARN_ON(!wdev->current_bss ||
		    !ether_addr_equal(wdev->current_bss->pub.bssid, bssid)))
		return;

	__cfg80211_disconnected(wdev->netdev, NULL, 0, reason_code, from_ap);
	cfg80211_sme_disassoc(wdev);
}

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void cfg80211_rx_mlme_mgmt(struct net_device *dev, const u8 *buf, size_t len)
{
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	struct ieee80211_mgmt *mgmt = (void *)buf;

	ASSERT_WDEV_LOCK(wdev);

	trace_cfg80211_rx_mlme_mgmt(dev, buf, len);

	if (WARN_ON(len < 2))
		return;

	if (ieee80211_is_auth(mgmt->frame_control))
		cfg80211_process_auth(wdev, buf, len);
	else if (ieee80211_is_deauth(mgmt->frame_control))
		cfg80211_process_deauth(wdev, buf, len);
	else if (ieee80211_is_disassoc(mgmt->frame_control))
		cfg80211_process_disassoc(wdev, buf, len);
}
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EXPORT_SYMBOL(cfg80211_rx_mlme_mgmt);



void cfg80211_auth_timeout(struct net_device *dev, const u8 *addr)
{
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	struct wiphy *wiphy = wdev->wiphy;
	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);

	trace_cfg80211_send_auth_timeout(dev, addr);

	nl80211_send_auth_timeout(rdev, dev, addr, GFP_KERNEL);
	cfg80211_sme_auth_timeout(wdev);
}
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EXPORT_SYMBOL(cfg80211_auth_timeout);



void cfg80211_assoc_timeout(struct net_device *dev, struct cfg80211_bss *bss)
{
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	struct wiphy *wiphy = wdev->wiphy;
	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);

	trace_cfg80211_send_assoc_timeout(dev, bss->bssid);

	nl80211_send_assoc_timeout(rdev, dev, bss->bssid, GFP_KERNEL);
	cfg80211_sme_assoc_timeout(wdev);

	cfg80211_unhold_bss(bss_from_pub(bss));
	cfg80211_put_bss(wiphy, bss);
}
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EXPORT_SYMBOL(cfg80211_assoc_timeout);



void cfg80211_abandon_assoc(struct net_device *dev, struct cfg80211_bss *bss)
{
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	struct wiphy *wiphy = wdev->wiphy;

	cfg80211_sme_abandon_assoc(wdev);

	cfg80211_unhold_bss(bss_from_pub(bss));
	cfg80211_put_bss(wiphy, bss);
}
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EXPORT_SYMBOL(cfg80211_abandon_assoc);



void cfg80211_tx_mlme_mgmt(struct net_device *dev, const u8 *buf, size_t len)
{
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	struct ieee80211_mgmt *mgmt = (void *)buf;

	ASSERT_WDEV_LOCK(wdev);

	trace_cfg80211_tx_mlme_mgmt(dev, buf, len);

	if (WARN_ON(len < 2))
		return;

	if (ieee80211_is_deauth(mgmt->frame_control))
		cfg80211_process_deauth(wdev, buf, len);
	else
		cfg80211_process_disassoc(wdev, buf, len);
}
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EXPORT_SYMBOL(cfg80211_tx_mlme_mgmt);



void cfg80211_michael_mic_failure(struct net_device *dev, const u8 *addr,
				  enum nl80211_key_type key_type, int key_id,
				  const u8 *tsc, gfp_t gfp)
{
	struct wiphy *wiphy = dev->ieee80211_ptr->wiphy;
	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
#ifdef CONFIG_CFG80211_WEXT
	union iwreq_data wrqu;
	char *buf = kmalloc(128, gfp);

	if (buf) {
		sprintf(buf, "MLME-MICHAELMICFAILURE.indication("
			"keyid=%d %scast addr=%pM)", key_id,
			key_type == NL80211_KEYTYPE_GROUP ? "broad" : "uni",
			addr);
		memset(&wrqu, 0, sizeof(wrqu));
		wrqu.data.length = strlen(buf);
		wireless_send_event(dev, IWEVCUSTOM, &wrqu, buf);
		kfree(buf);
	}
#endif

	trace_cfg80211_michael_mic_failure(dev, addr, key_type, key_id, tsc);
	nl80211_michael_mic_failure(rdev, dev, addr, key_type, key_id, tsc, gfp);
}
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EXPORT_SYMBOL(cfg80211_michael_mic_failure);

/* some MLME handling for userspace SME */


int cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
		       struct net_device *dev,
		       struct ieee80211_channel *chan,
		       enum nl80211_auth_type auth_type,
		       const u8 *bssid,
		       const u8 *ssid, int ssid_len,
		       const u8 *ie, int ie_len,
		       const u8 *key, int key_len, int key_idx,
		       const u8 *auth_data, int auth_data_len)
{
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	struct cfg80211_auth_request req = {
		.ie = ie,
		.ie_len = ie_len,
		.auth_data = auth_data,
		.auth_data_len = auth_data_len,
		.auth_type = auth_type,
		.key = key,
		.key_len = key_len,
		.key_idx = key_idx,
        };
	int err;

	ASSERT_WDEV_LOCK(wdev);

	if (auth_type == NL80211_AUTHTYPE_SHARED_KEY)
		if (!key || !key_len || key_idx < 0 || key_idx > 3)
			return -EINVAL;

	if (wdev->current_bss &&
	    ether_addr_equal(bssid, wdev->current_bss->pub.bssid))
		return -EALREADY;

	req.bss = cfg80211_get_bss(&rdev->wiphy, chan, bssid, ssid, ssid_len,
				   IEEE80211_BSS_TYPE_ESS,
				   IEEE80211_PRIVACY_ANY);
	if (!req.bss)
		return -ENOENT;

	err = rdev_auth(rdev, dev, &req);

	cfg80211_put_bss(&rdev->wiphy, req.bss);
	return err;
}

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/*  Do a logical ht_capa &= ht_capa_mask.  */


void cfg80211_oper_and_ht_capa(struct ieee80211_ht_cap *ht_capa,
			       const struct ieee80211_ht_cap *ht_capa_mask)
{
	int i;
	u8 *p1, *p2;
	if (!ht_capa_mask) {
		memset(ht_capa, 0, sizeof(*ht_capa));
		return;
	}

	p1 = (u8*)(ht_capa);
	p2 = (u8*)(ht_capa_mask);
	for (i = 0; i<sizeof(*ht_capa); i++)
		p1[i] &= p2[i];
}

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/*  Do a logical ht_capa &= ht_capa_mask.  */


void cfg80211_oper_and_vht_capa(struct ieee80211_vht_cap *vht_capa,
				const struct ieee80211_vht_cap *vht_capa_mask)
{
	int i;
	u8 *p1, *p2;
	if (!vht_capa_mask) {
		memset(vht_capa, 0, sizeof(*vht_capa));
		return;
	}

	p1 = (u8*)(vht_capa);
	p2 = (u8*)(vht_capa_mask);
	for (i = 0; i < sizeof(*vht_capa); i++)
		p1[i] &= p2[i];
}

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int cfg80211_mlme_assoc(struct cfg80211_registered_device *rdev,
			struct net_device *dev,
			struct ieee80211_channel *chan,
			const u8 *bssid,
			const u8 *ssid, int ssid_len,
			struct cfg80211_assoc_request *req)
{
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	int err;

	ASSERT_WDEV_LOCK(wdev);

	if (wdev->current_bss &&
	    (!req->prev_bssid || !ether_addr_equal(wdev->current_bss->pub.bssid,
						   req->prev_bssid)))
		return -EALREADY;

	cfg80211_oper_and_ht_capa(&req->ht_capa_mask,
				  rdev->wiphy.ht_capa_mod_mask);
	cfg80211_oper_and_vht_capa(&req->vht_capa_mask,
				   rdev->wiphy.vht_capa_mod_mask);

	req->bss = cfg80211_get_bss(&rdev->wiphy, chan, bssid, ssid, ssid_len,
				    IEEE80211_BSS_TYPE_ESS,
				    IEEE80211_PRIVACY_ANY);
	if (!req->bss)
		return -ENOENT;

	err = rdev_assoc(rdev, dev, req);
	if (!err)
		cfg80211_hold_bss(bss_from_pub(req->bss));
	else
		cfg80211_put_bss(&rdev->wiphy, req->bss);

	return err;
}

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int cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
			 struct net_device *dev, const u8 *bssid,
			 const u8 *ie, int ie_len, u16 reason,
			 bool local_state_change)
{
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	struct cfg80211_deauth_request req = {
		.bssid = bssid,
		.reason_code = reason,
		.ie = ie,
		.ie_len = ie_len,
		.local_state_change = local_state_change,
        };

	ASSERT_WDEV_LOCK(wdev);

	if (local_state_change &&
	    (!wdev->current_bss ||
	     !ether_addr_equal(wdev->current_bss->pub.bssid, bssid)))
		return 0;

	if (ether_addr_equal(wdev->disconnect_bssid, bssid) ||
	    (wdev->current_bss &&
	     ether_addr_equal(wdev->current_bss->pub.bssid, bssid)))
		wdev->conn_owner_nlportid = 0;

	return rdev_deauth(rdev, dev, &req);
}

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int cfg80211_mlme_disassoc(struct cfg80211_registered_device *rdev,
			   struct net_device *dev, const u8 *bssid,
			   const u8 *ie, int ie_len, u16 reason,
			   bool local_state_change)
{
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	struct cfg80211_disassoc_request req = {
		.reason_code = reason,
		.local_state_change = local_state_change,
		.ie = ie,
		.ie_len = ie_len,
        };
	int err;

	ASSERT_WDEV_LOCK(wdev);

	if (!wdev->current_bss)
		return -ENOTCONN;

	if (ether_addr_equal(wdev->current_bss->pub.bssid, bssid))
		req.bss = &wdev->current_bss->pub;
	else
		return -ENOTCONN;

	err = rdev_disassoc(rdev, dev, &req);
	if (err)
		return err;

	/* driver should have reported the disassoc */
	WARN_ON(wdev->current_bss);
	return 0;
}

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void cfg80211_mlme_down(struct cfg80211_registered_device *rdev,
			struct net_device *dev)
{
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	u8 bssid[ETH_ALEN];

	ASSERT_WDEV_LOCK(wdev);

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

	if (!wdev->current_bss)
		return;

	memcpy(bssid, wdev->current_bss->pub.bssid, ETH_ALEN);
	cfg80211_mlme_deauth(rdev, dev, bssid, NULL, 0,
			     WLAN_REASON_DEAUTH_LEAVING, false);
}

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struct cfg80211_mgmt_registration {
	
struct list_head list;
	
struct wireless_dev *wdev;

	
u32 nlportid;

	
int match_len;

	
__le16 frame_type;

	
u8 match[];
};


static void

cfg80211_process_mlme_unregistrations(struct cfg80211_registered_device *rdev)
{
	struct cfg80211_mgmt_registration *reg;

	ASSERT_RTNL();

	spin_lock_bh(&rdev->mlme_unreg_lock);
	while ((reg = list_first_entry_or_null(&rdev->mlme_unreg,
					       struct cfg80211_mgmt_registration,
					       list))) {
		list_del(&reg->list);
		spin_unlock_bh(&rdev->mlme_unreg_lock);

		if (rdev->ops->mgmt_frame_register) {
			u16 frame_type = le16_to_cpu(reg->frame_type);

			rdev_mgmt_frame_register(rdev, reg->wdev,
						 frame_type, false);
		}

		kfree(reg);

		spin_lock_bh(&rdev->mlme_unreg_lock);
	}
	spin_unlock_bh(&rdev->mlme_unreg_lock);
}

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void cfg80211_mlme_unreg_wk(struct work_struct *wk)
{
	struct cfg80211_registered_device *rdev;

	rdev = container_of(wk, struct cfg80211_registered_device,
			    mlme_unreg_wk);

	rtnl_lock();
	cfg80211_process_mlme_unregistrations(rdev);
	rtnl_unlock();
}

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int cfg80211_mlme_register_mgmt(struct wireless_dev *wdev, u32 snd_portid,
				u16 frame_type, const u8 *match_data,
				int match_len)
{
	struct wiphy *wiphy = wdev->wiphy;
	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
	struct cfg80211_mgmt_registration *reg, *nreg;
	int err = 0;
	u16 mgmt_type;

	if (!wdev->wiphy->mgmt_stypes)
		return -EOPNOTSUPP;

	if ((frame_type & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT)
		return -EINVAL;

	if (frame_type & ~(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE))
		return -EINVAL;

	mgmt_type = (frame_type & IEEE80211_FCTL_STYPE) >> 4;
	if (!(wdev->wiphy->mgmt_stypes[wdev->iftype].rx & BIT(mgmt_type)))
		return -EINVAL;

	nreg = kzalloc(sizeof(*reg) + match_len, GFP_KERNEL);
	if (!nreg)
		return -ENOMEM;

	spin_lock_bh(&wdev->mgmt_registrations_lock);

	list_for_each_entry(reg, &wdev->mgmt_registrations, list) {
		int mlen = min(match_len, reg->match_len);

		if (frame_type != le16_to_cpu(reg->frame_type))
			continue;

		if (memcmp(reg->match, match_data, mlen) == 0) {
			err = -EALREADY;
			break;
		}
	}

	if (err) {
		kfree(nreg);
		goto out;
	}

	memcpy(nreg->match, match_data, match_len);
	nreg->match_len = match_len;
	nreg->nlportid = snd_portid;
	nreg->frame_type = cpu_to_le16(frame_type);
	nreg->wdev = wdev;
	list_add(&nreg->list, &wdev->mgmt_registrations);
	spin_unlock_bh(&wdev->mgmt_registrations_lock);

	/* process all unregistrations to avoid driver confusion */
	cfg80211_process_mlme_unregistrations(rdev);

	if (rdev->ops->mgmt_frame_register)
		rdev_mgmt_frame_register(rdev, wdev, frame_type, true);

	return 0;

 out:
	spin_unlock_bh(&wdev->mgmt_registrations_lock);

	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Johannes Berg
274
80.35%
4
50.00%
Jouni Malinen
53
15.54%
2
25.00%
Beni Lev
13
3.81%
1
12.50%
Zhao, Gang
1
0.29%
1
12.50%
Total
341
100.00%
8
100.00%



void cfg80211_mlme_unregister_socket(struct wireless_dev *wdev, u32 nlportid)
{
	struct wiphy *wiphy = wdev->wiphy;
	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
	struct cfg80211_mgmt_registration *reg, *tmp;

	spin_lock_bh(&wdev->mgmt_registrations_lock);

	list_for_each_entry_safe(reg, tmp, &wdev->mgmt_registrations, list) {
		if (reg->nlportid != nlportid)
			continue;

		list_del(&reg->list);
		spin_lock(&rdev->mlme_unreg_lock);
		list_add_tail(&reg->list, &rdev->mlme_unreg);
		spin_unlock(&rdev->mlme_unreg_lock);

		schedule_work(&rdev->mlme_unreg_wk);
	}

	spin_unlock_bh(&wdev->mgmt_registrations_lock);

	if (nlportid && rdev->crit_proto_nlportid == nlportid) {
		rdev->crit_proto_nlportid = 0;
		rdev_crit_proto_stop(rdev, wdev);
	}

	if (nlportid == wdev->ap_unexpected_nlportid)
		wdev->ap_unexpected_nlportid = 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Johannes Berg
100
62.11%
2
28.57%
Pandiyarajan Pitchaimuthu
33
20.50%
1
14.29%
Arend Van Spriel
25
15.53%
1
14.29%
Jouni Malinen
1
0.62%
1
14.29%
Zhao, Gang
1
0.62%
1
14.29%
Eric W. Biedermann
1
0.62%
1
14.29%
Total
161
100.00%
7
100.00%



void cfg80211_mlme_purge_registrations(struct wireless_dev *wdev)
{
	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);

	spin_lock_bh(&wdev->mgmt_registrations_lock);
	spin_lock(&rdev->mlme_unreg_lock);
	list_splice_tail_init(&wdev->mgmt_registrations, &rdev->mlme_unreg);
	spin_unlock(&rdev->mlme_unreg_lock);
	spin_unlock_bh(&wdev->mgmt_registrations_lock);

	cfg80211_process_mlme_unregistrations(rdev);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Johannes Berg
62
86.11%
2
66.67%
Jouni Malinen
10
13.89%
1
33.33%
Total
72
100.00%
3
100.00%



int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
			  struct wireless_dev *wdev,
			  struct cfg80211_mgmt_tx_params *params, u64 *cookie)
{
	const struct ieee80211_mgmt *mgmt;
	u16 stype;

	if (!wdev->wiphy->mgmt_stypes)
		return -EOPNOTSUPP;

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

	if (params->