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root/net/mac80211/cfg.c

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DEFINITIONS

This source file includes following definitions.
  1. wiphy_to_hw
  2. nl80211_type_check
  3. ieee80211_add_iface
  4. ieee80211_del_iface
  5. ieee80211_change_iface
  6. ieee80211_add_key
  7. ieee80211_del_key
  8. ieee80211_get_key
  9. ieee80211_config_default_key
  10. sta_set_sinfo
  11. ieee80211_dump_station
  12. ieee80211_get_station
  13. ieee80211_config_beacon
  14. ieee80211_add_beacon
  15. ieee80211_set_beacon
  16. ieee80211_del_beacon
  17. ieee80211_send_layer2_update
  18. sta_apply_parameters
  19. ieee80211_add_station
  20. ieee80211_del_station
  21. ieee80211_change_station
  22. ieee80211_add_mpath
  23. ieee80211_del_mpath
  24. ieee80211_change_mpath
  25. mpath_set_pinfo
  26. ieee80211_get_mpath
  27. ieee80211_dump_mpath
  28. ieee80211_change_bss

/*
 * mac80211 configuration hooks for cfg80211
 *
 * Copyright 2006, 2007 Johannes Berg <johannes@sipsolutions.net>
 *
 * This file is GPLv2 as found in COPYING.
 */

#include <linux/ieee80211.h>
#include <linux/nl80211.h>
#include <linux/rtnetlink.h>
#include <net/net_namespace.h>
#include <linux/rcupdate.h>
#include <net/cfg80211.h>
#include "ieee80211_i.h"
#include "cfg.h"
#include "rate.h"
#include "mesh.h"

struct ieee80211_hw *wiphy_to_hw(struct wiphy *wiphy)
{
        struct ieee80211_local *local = wiphy_priv(wiphy);
        return &local->hw;
}
EXPORT_SYMBOL(wiphy_to_hw);

static bool nl80211_type_check(enum nl80211_iftype type)
{
        switch (type) {
        case NL80211_IFTYPE_ADHOC:
        case NL80211_IFTYPE_STATION:
        case NL80211_IFTYPE_MONITOR:
#ifdef CONFIG_MAC80211_MESH
        case NL80211_IFTYPE_MESH_POINT:
#endif
        case NL80211_IFTYPE_WDS:
                return true;
        default:
                return false;
        }
}

static int ieee80211_add_iface(struct wiphy *wiphy, char *name,
                               enum nl80211_iftype type, u32 *flags,
                               struct vif_params *params)
{
        struct ieee80211_local *local = wiphy_priv(wiphy);
        struct net_device *dev;
        struct ieee80211_sub_if_data *sdata;
        int err;

        if (!nl80211_type_check(type))
                return -EINVAL;

        err = ieee80211_if_add(local, name, &dev, type, params);
        if (err || type != NL80211_IFTYPE_MONITOR || !flags)
                return err;

        sdata = IEEE80211_DEV_TO_SUB_IF(dev);
        sdata->u.mntr_flags = *flags;
        return 0;
}

static int ieee80211_del_iface(struct wiphy *wiphy, int ifindex)
{
        struct net_device *dev;
        struct ieee80211_sub_if_data *sdata;

        /* we're under RTNL */
        dev = __dev_get_by_index(&init_net, ifindex);
        if (!dev)
                return -ENODEV;

        sdata = IEEE80211_DEV_TO_SUB_IF(dev);

        ieee80211_if_remove(sdata);

        return 0;
}

static int ieee80211_change_iface(struct wiphy *wiphy, int ifindex,
                                  enum nl80211_iftype type, u32 *flags,
                                  struct vif_params *params)
{
        struct net_device *dev;
        struct ieee80211_sub_if_data *sdata;
        int ret;

        /* we're under RTNL */
        dev = __dev_get_by_index(&init_net, ifindex);
        if (!dev)
                return -ENODEV;

        if (!nl80211_type_check(type))
                return -EINVAL;

        sdata = IEEE80211_DEV_TO_SUB_IF(dev);

        ret = ieee80211_if_change_type(sdata, type);
        if (ret)
                return ret;

        if (netif_running(sdata->dev))
                return -EBUSY;

        if (ieee80211_vif_is_mesh(&sdata->vif) && params->mesh_id_len)
                ieee80211_sdata_set_mesh_id(sdata,
                                            params->mesh_id_len,
                                            params->mesh_id);

        if (sdata->vif.type != NL80211_IFTYPE_MONITOR || !flags)
                return 0;

        sdata->u.mntr_flags = *flags;
        return 0;
}

static int ieee80211_add_key(struct wiphy *wiphy, struct net_device *dev,
                             u8 key_idx, u8 *mac_addr,
                             struct key_params *params)
{
        struct ieee80211_sub_if_data *sdata;
        struct sta_info *sta = NULL;
        enum ieee80211_key_alg alg;
        struct ieee80211_key *key;
        int err;

        sdata = IEEE80211_DEV_TO_SUB_IF(dev);

        switch (params->cipher) {
        case WLAN_CIPHER_SUITE_WEP40:
        case WLAN_CIPHER_SUITE_WEP104:
                alg = ALG_WEP;
                break;
        case WLAN_CIPHER_SUITE_TKIP:
                alg = ALG_TKIP;
                break;
        case WLAN_CIPHER_SUITE_CCMP:
                alg = ALG_CCMP;
                break;
        default:
                return -EINVAL;
        }

        key = ieee80211_key_alloc(alg, key_idx, params->key_len, params->key);
        if (!key)
                return -ENOMEM;

        rcu_read_lock();

        if (mac_addr) {
                sta = sta_info_get(sdata->local, mac_addr);
                if (!sta) {
                        ieee80211_key_free(key);
                        err = -ENOENT;
                        goto out_unlock;
                }
        }

        ieee80211_key_link(key, sdata, sta);

        err = 0;
 out_unlock:
        rcu_read_unlock();

        return err;
}

static int ieee80211_del_key(struct wiphy *wiphy, struct net_device *dev,
                             u8 key_idx, u8 *mac_addr)
{
        struct ieee80211_sub_if_data *sdata;
        struct sta_info *sta;
        int ret;

        sdata = IEEE80211_DEV_TO_SUB_IF(dev);

        rcu_read_lock();

        if (mac_addr) {
                ret = -ENOENT;

                sta = sta_info_get(sdata->local, mac_addr);
                if (!sta)
                        goto out_unlock;

                if (sta->key) {
                        ieee80211_key_free(sta->key);
                        WARN_ON(sta->key);
                        ret = 0;
                }

                goto out_unlock;
        }

        if (!sdata->keys[key_idx]) {
                ret = -ENOENT;
                goto out_unlock;
        }

        ieee80211_key_free(sdata->keys[key_idx]);
        WARN_ON(sdata->keys[key_idx]);

        ret = 0;
 out_unlock:
        rcu_read_unlock();

        return ret;
}

static int ieee80211_get_key(struct wiphy *wiphy, struct net_device *dev,
                             u8 key_idx, u8 *mac_addr, void *cookie,
                             void (*callback)(void *cookie,
                                              struct key_params *params))
{
        struct ieee80211_sub_if_data *sdata;
        struct sta_info *sta = NULL;
        u8 seq[6] = {0};
        struct key_params params;
        struct ieee80211_key *key;
        u32 iv32;
        u16 iv16;
        int err = -ENOENT;

        sdata = IEEE80211_DEV_TO_SUB_IF(dev);

        rcu_read_lock();

        if (mac_addr) {
                sta = sta_info_get(sdata->local, mac_addr);
                if (!sta)
                        goto out;

                key = sta->key;
        } else
                key = sdata->keys[key_idx];

        if (!key)
                goto out;

        memset(&params, 0, sizeof(params));

        switch (key->conf.alg) {
        case ALG_TKIP:
                params.cipher = WLAN_CIPHER_SUITE_TKIP;

                iv32 = key->u.tkip.tx.iv32;
                iv16 = key->u.tkip.tx.iv16;

                if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE &&
                    sdata->local->ops->get_tkip_seq)
                        sdata->local->ops->get_tkip_seq(
                                local_to_hw(sdata->local),
                                key->conf.hw_key_idx,
                                &iv32, &iv16);

                seq[0] = iv16 & 0xff;
                seq[1] = (iv16 >> 8) & 0xff;
                seq[2] = iv32 & 0xff;
                seq[3] = (iv32 >> 8) & 0xff;
                seq[4] = (iv32 >> 16) & 0xff;
                seq[5] = (iv32 >> 24) & 0xff;
                params.seq = seq;
                params.seq_len = 6;
                break;
        case ALG_CCMP:
                params.cipher = WLAN_CIPHER_SUITE_CCMP;
                seq[0] = key->u.ccmp.tx_pn[5];
                seq[1] = key->u.ccmp.tx_pn[4];
                seq[2] = key->u.ccmp.tx_pn[3];
                seq[3] = key->u.ccmp.tx_pn[2];
                seq[4] = key->u.ccmp.tx_pn[1];
                seq[5] = key->u.ccmp.tx_pn[0];
                params.seq = seq;
                params.seq_len = 6;
                break;
        case ALG_WEP:
                if (key->conf.keylen == 5)
                        params.cipher = WLAN_CIPHER_SUITE_WEP40;
                else
                        params.cipher = WLAN_CIPHER_SUITE_WEP104;
                break;
        }

        params.key = key->conf.key;
        params.key_len = key->conf.keylen;

        callback(cookie, &params);
        err = 0;

 out:
        rcu_read_unlock();
        return err;
}

static int ieee80211_config_default_key(struct wiphy *wiphy,
                                        struct net_device *dev,
                                        u8 key_idx)
{
        struct ieee80211_sub_if_data *sdata;

        rcu_read_lock();

        sdata = IEEE80211_DEV_TO_SUB_IF(dev);
        ieee80211_set_default_key(sdata, key_idx);

        rcu_read_unlock();

        return 0;
}

static void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo)
{
        struct ieee80211_sub_if_data *sdata = sta->sdata;

        sinfo->filled = STATION_INFO_INACTIVE_TIME |
                        STATION_INFO_RX_BYTES |
                        STATION_INFO_TX_BYTES;

        sinfo->inactive_time = jiffies_to_msecs(jiffies - sta->last_rx);
        sinfo->rx_bytes = sta->rx_bytes;
        sinfo->tx_bytes = sta->tx_bytes;

        if (ieee80211_vif_is_mesh(&sdata->vif)) {
#ifdef CONFIG_MAC80211_MESH
                sinfo->filled |= STATION_INFO_LLID |
                                 STATION_INFO_PLID |
                                 STATION_INFO_PLINK_STATE;

                sinfo->llid = le16_to_cpu(sta->llid);
                sinfo->plid = le16_to_cpu(sta->plid);
                sinfo->plink_state = sta->plink_state;
#endif
        }
}


static int ieee80211_dump_station(struct wiphy *wiphy, struct net_device *dev,
                                 int idx, u8 *mac, struct station_info *sinfo)
{
        struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
        struct sta_info *sta;
        int ret = -ENOENT;

        rcu_read_lock();

        sta = sta_info_get_by_idx(local, idx, dev);
        if (sta) {
                ret = 0;
                memcpy(mac, sta->sta.addr, ETH_ALEN);
                sta_set_sinfo(sta, sinfo);
        }

        rcu_read_unlock();

        return ret;
}

static int ieee80211_get_station(struct wiphy *wiphy, struct net_device *dev,
                                 u8 *mac, struct station_info *sinfo)
{
        struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
        struct sta_info *sta;
        int ret = -ENOENT;

        rcu_read_lock();

        /* XXX: verify sta->dev == dev */

        sta = sta_info_get(local, mac);
        if (sta) {
                ret = 0;
                sta_set_sinfo(sta, sinfo);
        }

        rcu_read_unlock();

        return ret;
}

/*
 * This handles both adding a beacon and setting new beacon info
 */
static int ieee80211_config_beacon(struct ieee80211_sub_if_data *sdata,
                                   struct beacon_parameters *params)
{
        struct beacon_data *new, *old;
        int new_head_len, new_tail_len;
        int size;
        int err = -EINVAL;

        old = sdata->u.ap.beacon;

        /* head must not be zero-length */
        if (params->head && !params->head_len)
                return -EINVAL;

        /*
         * This is a kludge. beacon interval should really be part
         * of the beacon information.
         */
        if (params->interval) {
                sdata->local->hw.conf.beacon_int = params->interval;
                if (ieee80211_hw_config(sdata->local))
                        return -EINVAL;
                /*
                 * We updated some parameter so if below bails out
                 * it's not an error.
                 */
                err = 0;
        }

        /* Need to have a beacon head if we don't have one yet */
        if (!params->head && !old)
                return err;

        /* sorry, no way to start beaconing without dtim period */
        if (!params->dtim_period && !old)
                return err;

        /* new or old head? */
        if (params->head)
                new_head_len = params->head_len;
        else
                new_head_len = old->head_len;

        /* new or old tail? */
        if (params->tail || !old)
                /* params->tail_len will be zero for !params->tail */
                new_tail_len = params->tail_len;
        else
                new_tail_len = old->tail_len;

        size = sizeof(*new) + new_head_len + new_tail_len;

        new = kzalloc(size, GFP_KERNEL);
        if (!new)
                return -ENOMEM;

        /* start filling the new info now */

        /* new or old dtim period? */
        if (params->dtim_period)
                new->dtim_period = params->dtim_period;
        else
                new->dtim_period = old->dtim_period;

        /*
         * pointers go into the block we allocated,
         * memory is | beacon_data | head | tail |
         */
        new->head = ((u8 *) new) + sizeof(*new);
        new->tail = new->head + new_head_len;
        new->head_len = new_head_len;
        new->tail_len = new_tail_len;

        /* copy in head */
        if (params->head)
                memcpy(new->head, params->head, new_head_len);
        else
                memcpy(new->head, old->head, new_head_len);

        /* copy in optional tail */
        if (params->tail)
                memcpy(new->tail, params->tail, new_tail_len);
        else
                if (old)
                        memcpy(new->tail, old->tail, new_tail_len);

        rcu_assign_pointer(sdata->u.ap.beacon, new);

        synchronize_rcu();

        kfree(old);

        return ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
}

static int ieee80211_add_beacon(struct wiphy *wiphy, struct net_device *dev,
                                struct beacon_parameters *params)
{
        struct ieee80211_sub_if_data *sdata;
        struct beacon_data *old;

        sdata = IEEE80211_DEV_TO_SUB_IF(dev);

        if (sdata->vif.type != NL80211_IFTYPE_AP)
                return -EINVAL;

        old = sdata->u.ap.beacon;

        if (old)
                return -EALREADY;

        return ieee80211_config_beacon(sdata, params);
}

static int ieee80211_set_beacon(struct wiphy *wiphy, struct net_device *dev,
                                struct beacon_parameters *params)
{
        struct ieee80211_sub_if_data *sdata;
        struct beacon_data *old;

        sdata = IEEE80211_DEV_TO_SUB_IF(dev);

        if (sdata->vif.type != NL80211_IFTYPE_AP)
                return -EINVAL;

        old = sdata->u.ap.beacon;

        if (!old)
                return -ENOENT;

        return ieee80211_config_beacon(sdata, params);
}

static int ieee80211_del_beacon(struct wiphy *wiphy, struct net_device *dev)
{
        struct ieee80211_sub_if_data *sdata;
        struct beacon_data *old;

        sdata = IEEE80211_DEV_TO_SUB_IF(dev);

        if (sdata->vif.type != NL80211_IFTYPE_AP)
                return -EINVAL;

        old = sdata->u.ap.beacon;

        if (!old)
                return -ENOENT;

        rcu_assign_pointer(sdata->u.ap.beacon, NULL);
        synchronize_rcu();
        kfree(old);

        return ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
}

/* Layer 2 Update frame (802.2 Type 1 LLC XID Update response) */
struct iapp_layer2_update {
        u8 da[ETH_ALEN];        /* broadcast */
        u8 sa[ETH_ALEN];        /* STA addr */
        __be16 len;             /* 6 */
        u8 dsap;                /* 0 */
        u8 ssap;                /* 0 */
        u8 control;
        u8 xid_info[3];
} __attribute__ ((packed));

static void ieee80211_send_layer2_update(struct sta_info *sta)
{
        struct iapp_layer2_update *msg;
        struct sk_buff *skb;

        /* Send Level 2 Update Frame to update forwarding tables in layer 2
         * bridge devices */

        skb = dev_alloc_skb(sizeof(*msg));
        if (!skb)
                return;
        msg = (struct iapp_layer2_update *)skb_put(skb, sizeof(*msg));

        /* 802.2 Type 1 Logical Link Control (LLC) Exchange Identifier (XID)
         * Update response frame; IEEE Std 802.2-1998, 5.4.1.2.1 */

        memset(msg->da, 0xff, ETH_ALEN);
        memcpy(msg->sa, sta->sta.addr, ETH_ALEN);
        msg->len = htons(6);
        msg->dsap = 0;
        msg->ssap = 0x01;       /* NULL LSAP, CR Bit: Response */
        msg->control = 0xaf;    /* XID response lsb.1111F101.
                                 * F=0 (no poll command; unsolicited frame) */
        msg->xid_info[0] = 0x81;        /* XID format identifier */
        msg->xid_info[1] = 1;   /* LLC types/classes: Type 1 LLC */
        msg->xid_info[2] = 0;   /* XID sender's receive window size (RW) */

        skb->dev = sta->sdata->dev;
        skb->protocol = eth_type_trans(skb, sta->sdata->dev);
        memset(skb->cb, 0, sizeof(skb->cb));
        netif_rx(skb);
}

static void sta_apply_parameters(struct ieee80211_local *local,
                                 struct sta_info *sta,
                                 struct station_parameters *params)
{
        u32 rates;
        int i, j;
        struct ieee80211_supported_band *sband;
        struct ieee80211_sub_if_data *sdata = sta->sdata;

        /*
         * FIXME: updating the flags is racy when this function is
         *        called from ieee80211_change_station(), this will
         *        be resolved in a future patch.
         */

        if (params->station_flags & STATION_FLAG_CHANGED) {
                spin_lock_bh(&sta->lock);
                sta->flags &= ~WLAN_STA_AUTHORIZED;
                if (params->station_flags & STATION_FLAG_AUTHORIZED)
                        sta->flags |= WLAN_STA_AUTHORIZED;

                sta->flags &= ~WLAN_STA_SHORT_PREAMBLE;
                if (params->station_flags & STATION_FLAG_SHORT_PREAMBLE)
                        sta->flags |= WLAN_STA_SHORT_PREAMBLE;

                sta->flags &= ~WLAN_STA_WME;
                if (params->station_flags & STATION_FLAG_WME)
                        sta->flags |= WLAN_STA_WME;
                spin_unlock_bh(&sta->lock);
        }

        /*
         * FIXME: updating the following information is racy when this
         *        function is called from ieee80211_change_station().
         *        However, all this information should be static so
         *        maybe we should just reject attemps to change it.
         */

        if (params->aid) {
                sta->sta.aid = params->aid;
                if (sta->sta.aid > IEEE80211_MAX_AID)
                        sta->sta.aid = 0; /* XXX: should this be an error? */
        }

        if (params->listen_interval >= 0)
                sta->listen_interval = params->listen_interval;

        if (params->supported_rates) {
                rates = 0;
                sband = local->hw.wiphy->bands[local->oper_channel->band];

                for (i = 0; i < params->supported_rates_len; i++) {
                        int rate = (params->supported_rates[i] & 0x7f) * 5;
                        for (j = 0; j < sband->n_bitrates; j++) {
                                if (sband->bitrates[j].bitrate == rate)
                                        rates |= BIT(j);
                        }
                }
                sta->sta.supp_rates[local->oper_channel->band] = rates;
        }

        if (params->ht_capa) {
                ieee80211_ht_cap_ie_to_ht_info(params->ht_capa,
                                               &sta->sta.ht_info);
        }

        if (ieee80211_vif_is_mesh(&sdata->vif) && params->plink_action) {
                switch (params->plink_action) {
                case PLINK_ACTION_OPEN:
                        mesh_plink_open(sta);
                        break;
                case PLINK_ACTION_BLOCK:
                        mesh_plink_block(sta);
                        break;
                }
        }
}

static int ieee80211_add_station(struct wiphy *wiphy, struct net_device *dev,
                                 u8 *mac, struct station_parameters *params)
{
        struct ieee80211_local *local = wiphy_priv(wiphy);
        struct sta_info *sta;
        struct ieee80211_sub_if_data *sdata;
        int err;

        /* Prevent a race with changing the rate control algorithm */
        if (!netif_running(dev))
                return -ENETDOWN;

        if (params->vlan) {
                sdata = IEEE80211_DEV_TO_SUB_IF(params->vlan);

                if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
                    sdata->vif.type != NL80211_IFTYPE_AP)
                        return -EINVAL;
        } else
                sdata = IEEE80211_DEV_TO_SUB_IF(dev);

        if (compare_ether_addr(mac, dev->dev_addr) == 0)
                return -EINVAL;

        if (is_multicast_ether_addr(mac))
                return -EINVAL;

        sta = sta_info_alloc(sdata, mac, GFP_KERNEL);
        if (!sta)
                return -ENOMEM;

        sta->flags = WLAN_STA_AUTH | WLAN_STA_ASSOC;

        sta_apply_parameters(local, sta, params);

        rate_control_rate_init(sta);

        rcu_read_lock();

        err = sta_info_insert(sta);
        if (err) {
                /* STA has been freed */
                rcu_read_unlock();
                return err;
        }

        if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
            sdata->vif.type == NL80211_IFTYPE_AP)
                ieee80211_send_layer2_update(sta);

        rcu_read_unlock();

        return 0;
}

static int ieee80211_del_station(struct wiphy *wiphy, struct net_device *dev,
                                 u8 *mac)
{
        struct ieee80211_local *local = wiphy_priv(wiphy);
        struct ieee80211_sub_if_data *sdata;
        struct sta_info *sta;

        sdata = IEEE80211_DEV_TO_SUB_IF(dev);

        if (mac) {
                rcu_read_lock();

                /* XXX: get sta belonging to dev */
                sta = sta_info_get(local, mac);
                if (!sta) {
                        rcu_read_unlock();
                        return -ENOENT;
                }

                sta_info_unlink(&sta);
                rcu_read_unlock();

                sta_info_destroy(sta);
        } else
                sta_info_flush(local, sdata);

        return 0;
}

static int ieee80211_change_station(struct wiphy *wiphy,
                                    struct net_device *dev,
                                    u8 *mac,
                                    struct station_parameters *params)
{
        struct ieee80211_local *local = wiphy_priv(wiphy);
        struct sta_info *sta;
        struct ieee80211_sub_if_data *vlansdata;

        rcu_read_lock();

        /* XXX: get sta belonging to dev */
        sta = sta_info_get(local, mac);
        if (!sta) {
                rcu_read_unlock();
                return -ENOENT;
        }

        if (params->vlan && params->vlan != sta->sdata->dev) {
                vlansdata = IEEE80211_DEV_TO_SUB_IF(params->vlan);

                if (vlansdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
                    vlansdata->vif.type != NL80211_IFTYPE_AP) {
                        rcu_read_unlock();
                        return -EINVAL;
                }

                sta->sdata = vlansdata;
                ieee80211_send_layer2_update(sta);
        }

        sta_apply_parameters(local, sta, params);

        rcu_read_unlock();

        return 0;
}

#ifdef CONFIG_MAC80211_MESH
static int ieee80211_add_mpath(struct wiphy *wiphy, struct net_device *dev,
                                 u8 *dst, u8 *next_hop)
{
        struct ieee80211_local *local = wiphy_priv(wiphy);
        struct ieee80211_sub_if_data *sdata;
        struct mesh_path *mpath;
        struct sta_info *sta;
        int err;

        if (!netif_running(dev))
                return -ENETDOWN;

        sdata = IEEE80211_DEV_TO_SUB_IF(dev);

        if (sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
                return -ENOTSUPP;

        rcu_read_lock();
        sta = sta_info_get(local, next_hop);
        if (!sta) {
                rcu_read_unlock();
                return -ENOENT;
        }

        err = mesh_path_add(dst, sdata);
        if (err) {
                rcu_read_unlock();
                return err;
        }

        mpath = mesh_path_lookup(dst, sdata);
        if (!mpath) {
                rcu_read_unlock();
                return -ENXIO;
        }
        mesh_path_fix_nexthop(mpath, sta);

        rcu_read_unlock();
        return 0;
}

static int ieee80211_del_mpath(struct wiphy *wiphy, struct net_device *dev,
                                 u8 *dst)
{
        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);

        if (dst)
                return mesh_path_del(dst, sdata);

        mesh_path_flush(sdata);
        return 0;
}

static int ieee80211_change_mpath(struct wiphy *wiphy,
                                    struct net_device *dev,
                                    u8 *dst, u8 *next_hop)
{
        struct ieee80211_local *local = wiphy_priv(wiphy);
        struct ieee80211_sub_if_data *sdata;
        struct mesh_path *mpath;
        struct sta_info *sta;

        if (!netif_running(dev))
                return -ENETDOWN;

        sdata = IEEE80211_DEV_TO_SUB_IF(dev);

        if (sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
                return -ENOTSUPP;

        rcu_read_lock();

        sta = sta_info_get(local, next_hop);
        if (!sta) {
                rcu_read_unlock();
                return -ENOENT;
        }

        mpath = mesh_path_lookup(dst, sdata);
        if (!mpath) {
                rcu_read_unlock();
                return -ENOENT;
        }

        mesh_path_fix_nexthop(mpath, sta);

        rcu_read_unlock();
        return 0;
}

static void mpath_set_pinfo(struct mesh_path *mpath, u8 *next_hop,
                            struct mpath_info *pinfo)
{
        if (mpath->next_hop)
                memcpy(next_hop, mpath->next_hop->sta.addr, ETH_ALEN);
        else
                memset(next_hop, 0, ETH_ALEN);

        pinfo->filled = MPATH_INFO_FRAME_QLEN |
                        MPATH_INFO_DSN |
                        MPATH_INFO_METRIC |
                        MPATH_INFO_EXPTIME |
                        MPATH_INFO_DISCOVERY_TIMEOUT |
                        MPATH_INFO_DISCOVERY_RETRIES |
                        MPATH_INFO_FLAGS;

        pinfo->frame_qlen = mpath->frame_queue.qlen;
        pinfo->dsn = mpath->dsn;
        pinfo->metric = mpath->metric;
        if (time_before(jiffies, mpath->exp_time))
                pinfo->exptime = jiffies_to_msecs(mpath->exp_time - jiffies);
        pinfo->discovery_timeout =
                        jiffies_to_msecs(mpath->discovery_timeout);
        pinfo->discovery_retries = mpath->discovery_retries;
        pinfo->flags = 0;
        if (mpath->flags & MESH_PATH_ACTIVE)
                pinfo->flags |= NL80211_MPATH_FLAG_ACTIVE;
        if (mpath->flags & MESH_PATH_RESOLVING)
                pinfo->flags |= NL80211_MPATH_FLAG_RESOLVING;
        if (mpath->flags & MESH_PATH_DSN_VALID)
                pinfo->flags |= NL80211_MPATH_FLAG_DSN_VALID;
        if (mpath->flags & MESH_PATH_FIXED)
                pinfo->flags |= NL80211_MPATH_FLAG_FIXED;
        if (mpath->flags & MESH_PATH_RESOLVING)
                pinfo->flags |= NL80211_MPATH_FLAG_RESOLVING;

        pinfo->flags = mpath->flags;
}

static int ieee80211_get_mpath(struct wiphy *wiphy, struct net_device *dev,
                               u8 *dst, u8 *next_hop, struct mpath_info *pinfo)

{
        struct ieee80211_sub_if_data *sdata;
        struct mesh_path *mpath;

        sdata = IEEE80211_DEV_TO_SUB_IF(dev);

        if (sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
                return -ENOTSUPP;

        rcu_read_lock();
        mpath = mesh_path_lookup(dst, sdata);
        if (!mpath) {
                rcu_read_unlock();
                return -ENOENT;
        }
        memcpy(dst, mpath->dst, ETH_ALEN);
        mpath_set_pinfo(mpath, next_hop, pinfo);
        rcu_read_unlock();
        return 0;
}

static int ieee80211_dump_mpath(struct wiphy *wiphy, struct net_device *dev,
                                 int idx, u8 *dst, u8 *next_hop,
                                 struct mpath_info *pinfo)
{
        struct ieee80211_sub_if_data *sdata;
        struct mesh_path *mpath;

        sdata = IEEE80211_DEV_TO_SUB_IF(dev);

        if (sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
                return -ENOTSUPP;

        rcu_read_lock();
        mpath = mesh_path_lookup_by_idx(idx, sdata);
        if (!mpath) {
                rcu_read_unlock();
                return -ENOENT;
        }
        memcpy(dst, mpath->dst, ETH_ALEN);
        mpath_set_pinfo(mpath, next_hop, pinfo);
        rcu_read_unlock();
        return 0;
}
#endif

static int ieee80211_change_bss(struct wiphy *wiphy,
                                struct net_device *dev,
                                struct bss_parameters *params)
{
        struct ieee80211_sub_if_data *sdata;
        u32 changed = 0;

        sdata = IEEE80211_DEV_TO_SUB_IF(dev);

        if (sdata->vif.type != NL80211_IFTYPE_AP)
                return -EINVAL;

        if (params->use_cts_prot >= 0) {
                sdata->bss_conf.use_cts_prot = params->use_cts_prot;
                changed |= BSS_CHANGED_ERP_CTS_PROT;
        }
        if (params->use_short_preamble >= 0) {
                sdata->bss_conf.use_short_preamble =
                        params->use_short_preamble;
                changed |= BSS_CHANGED_ERP_PREAMBLE;
        }
        if (params->use_short_slot_time >= 0) {
                sdata->bss_conf.use_short_slot =
                        params->use_short_slot_time;
                changed |= BSS_CHANGED_ERP_SLOT;
        }

        ieee80211_bss_info_change_notify(sdata, changed);

        return 0;
}

struct cfg80211_ops mac80211_config_ops = {
        .add_virtual_intf = ieee80211_add_iface,
        .del_virtual_intf = ieee80211_del_iface,
        .change_virtual_intf = ieee80211_change_iface,
        .add_key = ieee80211_add_key,
        .del_key = ieee80211_del_key,
        .get_key = ieee80211_get_key,
        .set_default_key = ieee80211_config_default_key,
        .add_beacon = ieee80211_add_beacon,
        .set_beacon = ieee80211_set_beacon,
        .del_beacon = ieee80211_del_beacon,
        .add_station = ieee80211_add_station,
        .del_station = ieee80211_del_station,
        .change_station = ieee80211_change_station,
        .get_station = ieee80211_get_station,
        .dump_station = ieee80211_dump_station,
#ifdef CONFIG_MAC80211_MESH
        .add_mpath = ieee80211_add_mpath,
        .del_mpath = ieee80211_del_mpath,
        .change_mpath = ieee80211_change_mpath,
        .get_mpath = ieee80211_get_mpath,
        .dump_mpath = ieee80211_dump_mpath,
#endif
        .change_bss = ieee80211_change_bss,
};

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