cfg80211: basic support for PBSS network type

PBSS (Personal Basic Service Set) is a new BSS type for DMG
networks. It is similar to infrastructure BSS, having an AP-like
entity called PCP (PBSS Control Point), but it has few differences.
PBSS support is mandatory for 11ad devices.

Add support for PBSS by introducing a new PBSS flag attribute.
The PBSS flag is used in the START_AP command to request starting
a PCP instead of an AP, and in the CONNECT command to request
connecting to a PCP instead of an AP.

Signed-off-by: Lior David <liord@codeaurora.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/drivers/net/wireless/ath/wil6210/cfg80211.c b/drivers/net/wireless/ath/wil6210/cfg80211.c
index 20d07ef..1f231cd 100644 (file)
--- a/drivers/net/wireless/ath/wil6210/cfg80211.c
+++ b/drivers/net/wireless/ath/wil6210/cfg80211.c
@@ -422,6 +422,11 @@ static int wil_cfg80211_connect(struct wiphy *wiphy,
        if (sme->privacy && !rsn_eid)
                wil_info(wil, "WSC connection\n");
 
+       if (sme->pbss) {
+               wil_err(wil, "connect - PBSS not yet supported\n");
+               return -EOPNOTSUPP;
+       }
+
        bss = cfg80211_get_bss(wiphy, sme->channel, sme->bssid,
                               sme->ssid, sme->ssid_len,
                               IEEE80211_BSS_TYPE_ESS, IEEE80211_PRIVACY_ANY);
@@ -870,6 +875,11 @@ static int wil_cfg80211_start_ap(struct wiphy *wiphy,
                return -EINVAL;
        }
 
+       if (info->pbss) {
+               wil_err(wil, "AP: PBSS not yet supported\n");
+               return -EOPNOTSUPP;
+       }
+
        switch (info->hidden_ssid) {
        case NL80211_HIDDEN_SSID_NOT_IN_USE:
                hidden_ssid = WMI_HIDDEN_SSID_DISABLED;

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 9bcaaf7..9e1b24c 100644 (file)
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -712,6 +712,8 @@ struct cfg80211_acl_data {
  * @p2p_opp_ps: P2P opportunistic PS
  * @acl: ACL configuration used by the drivers which has support for
  *     MAC address based access control
+ * @pbss: If set, start as a PCP instead of AP. Relevant for DMG
+ *     networks.
  */
 struct cfg80211_ap_settings {
        struct cfg80211_chan_def chandef;
@@ -730,6 +732,7 @@ struct cfg80211_ap_settings {
        u8 p2p_ctwindow;
        bool p2p_opp_ps;
        const struct cfg80211_acl_data *acl;
+       bool pbss;
 };
 
 /**
@@ -1888,6 +1891,8 @@ struct cfg80211_ibss_params {
  * @ht_capa_mask:  The bits of ht_capa which are to be used.
  * @vht_capa:  VHT Capability overrides
  * @vht_capa_mask: The bits of vht_capa which are to be used.
+ * @pbss: if set, connect to a PCP instead of AP. Valid for DMG
+ *     networks.
  */
 struct cfg80211_connect_params {
        struct ieee80211_channel *channel;
@@ -1910,6 +1915,7 @@ struct cfg80211_connect_params {
        struct ieee80211_ht_cap ht_capa_mask;
        struct ieee80211_vht_cap vht_capa;
        struct ieee80211_vht_cap vht_capa_mask;
+       bool pbss;
 };
 
 /**
@@ -3489,6 +3495,7 @@ struct cfg80211_cached_keys;
  *     registered for unexpected class 3 frames (AP mode)
  * @conn: (private) cfg80211 software SME connection state machine data
  * @connect_keys: (private) keys to set after connection is established
+ * @conn_bss_type: connecting/connected BSS type
  * @ibss_fixed: (private) IBSS is using fixed BSSID
  * @ibss_dfs_possible: (private) IBSS may change to a DFS channel
  * @event_list: (private) list for internal event processing
@@ -3519,6 +3526,7 @@ struct wireless_dev {
        u8 ssid_len, mesh_id_len, mesh_id_up_len;
        struct cfg80211_conn *conn;
        struct cfg80211_cached_keys *connect_keys;
+       enum ieee80211_bss_type conn_bss_type;
 
        struct list_head event_list;
        spinlock_t event_lock;

diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 5b7b5eb..7758969 100644 (file)
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -1789,6 +1789,10 @@ enum nl80211_commands {
  *     thus it must not specify the number of iterations, only the interval
  *     between scans. The scan plans are executed sequentially.
  *     Each scan plan is a nested attribute of &enum nl80211_sched_scan_plan.
+ * @NL80211_ATTR_PBSS: flag attribute. If set it means operate
+ *     in a PBSS. Specified in %NL80211_CMD_CONNECT to request
+ *     connecting to a PCP, and in %NL80211_CMD_START_AP to start
+ *     a PCP instead of AP. Relevant for DMG networks only.
  *
  * @NUM_NL80211_ATTR: total number of nl80211_attrs available
  * @NL80211_ATTR_MAX: highest attribute number currently defined
@@ -2164,6 +2168,8 @@ enum nl80211_attrs {
        NL80211_ATTR_MAX_SCAN_PLAN_ITERATIONS,
        NL80211_ATTR_SCHED_SCAN_PLANS,
 
+       NL80211_ATTR_PBSS,
+
        /* add attributes here, update the policy in nl80211.c */
 
        __NL80211_ATTR_AFTER_LAST,

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index d4786f2..268cb49 100644 (file)
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -401,6 +401,7 @@ static const struct nla_policy nl80211_policy[NUM_NL80211_ATTR] = {
        [NL80211_ATTR_NETNS_FD] = { .type = NLA_U32 },
        [NL80211_ATTR_SCHED_SCAN_DELAY] = { .type = NLA_U32 },
        [NL80211_ATTR_REG_INDOOR] = { .type = NLA_FLAG },
+       [NL80211_ATTR_PBSS] = { .type = NLA_FLAG },
 };
 
 /* policy for the key attributes */
@@ -3461,6 +3462,10 @@ static int nl80211_start_ap(struct sk_buff *skb, struct genl_info *info)
                        return PTR_ERR(params.acl);
        }
 
+       params.pbss = nla_get_flag(info->attrs[NL80211_ATTR_PBSS]);
+       if (params.pbss && !rdev->wiphy.bands[IEEE80211_BAND_60GHZ])
+               return -EOPNOTSUPP;
+
        wdev_lock(wdev);
        err = rdev_start_ap(rdev, dev, &params);
        if (!err) {
@@ -7980,6 +7985,12 @@ static int nl80211_connect(struct sk_buff *skb, struct genl_info *info)
                connect.flags |= ASSOC_REQ_USE_RRM;
        }
 
+       connect.pbss = nla_get_flag(info->attrs[NL80211_ATTR_PBSS]);
+       if (connect.pbss && !rdev->wiphy.bands[IEEE80211_BAND_60GHZ]) {
+               kzfree(connkeys);
+               return -EOPNOTSUPP;
+       }
+
        wdev_lock(dev->ieee80211_ptr);
        err = cfg80211_connect(rdev, dev, &connect, connkeys, NULL);
        wdev_unlock(dev->ieee80211_ptr);

diff --git a/net/wireless/sme.c b/net/wireless/sme.c
index 8020b5b..79bd3a1 100644 (file)
--- a/net/wireless/sme.c
+++ b/net/wireless/sme.c
@@ -264,7 +264,7 @@ static struct cfg80211_bss *cfg80211_get_conn_bss(struct wireless_dev *wdev)
                               wdev->conn->params.bssid,
                               wdev->conn->params.ssid,
                               wdev->conn->params.ssid_len,
-                              IEEE80211_BSS_TYPE_ESS,
+                              wdev->conn_bss_type,
                               IEEE80211_PRIVACY(wdev->conn->params.privacy));
        if (!bss)
                return NULL;
@@ -687,7 +687,7 @@ void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
                WARN_ON_ONCE(!wiphy_to_rdev(wdev->wiphy)->ops->connect);
                bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
                                       wdev->ssid, wdev->ssid_len,
-                                      IEEE80211_BSS_TYPE_ESS,
+                                      wdev->conn_bss_type,
                                       IEEE80211_PRIVACY_ANY);
                if (bss)
                        cfg80211_hold_bss(bss_from_pub(bss));
@@ -846,7 +846,7 @@ void cfg80211_roamed(struct net_device *dev,
 
        bss = cfg80211_get_bss(wdev->wiphy, channel, bssid, wdev->ssid,
                               wdev->ssid_len,
-                              IEEE80211_BSS_TYPE_ESS, IEEE80211_PRIVACY_ANY);
+                              wdev->conn_bss_type, IEEE80211_PRIVACY_ANY);
        if (WARN_ON(!bss))
                return;
 
@@ -1017,6 +1017,9 @@ int cfg80211_connect(struct cfg80211_registered_device *rdev,
        memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
        wdev->ssid_len = connect->ssid_len;
 
+       wdev->conn_bss_type = connect->pbss ? IEEE80211_BSS_TYPE_PBSS :
+                                             IEEE80211_BSS_TYPE_ESS;
+
        if (!rdev->ops->connect)
                err = cfg80211_sme_connect(wdev, connect, prev_bssid);
        else