nl80211: advertise GTK rekey support, new triggers

Since we now have the necessary API in place to support
GTK rekeying, applications will need to know whether it
is supported by a device. Add a pseudo-trigger that is
used only to advertise that capability. Also, add some
new triggers that match what iwlagn devices can do.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

4 files changed, 90 insertions, 6 deletions

diff --git a/include/linux/nl80211.h b/include/linux/nl80211.h
index 8cb025a00094..c5f577e9ee27 100644
--- a/include/linux/nl80211.h
+++ b/include/linux/nl80211.h
@@ -989,8 +989,8 @@ enum nl80211_commands {
  *      driving the peer link management state machine.
  *      @NL80211_MESH_SETUP_USERSPACE_AMPE must be enabled.
  *
- * @NL80211_ATTR_WOWLAN_SUPPORTED: indicates, as part of the wiphy capabilities,
- *      the supported WoWLAN triggers
+ * @NL80211_ATTR_WOWLAN_TRIGGERS_SUPPORTED: indicates, as part of the wiphy
+ *      capabilities, the supported WoWLAN triggers
  * @NL80211_ATTR_WOWLAN_TRIGGERS: used by %NL80211_CMD_SET_WOWLAN to
  *      indicate which WoW triggers should be enabled. This is also
  *      used by %NL80211_CMD_GET_WOWLAN to get the currently enabled WoWLAN
@@ -2255,6 +2255,16 @@ struct nl80211_wowlan_pattern_support {
  *
  *      In %NL80211_ATTR_WOWLAN_TRIGGERS_SUPPORTED, it is a binary attribute
  *      carrying a &struct nl80211_wowlan_pattern_support.
+ * @NL80211_WOWLAN_TRIG_GTK_REKEY_SUPPORTED: Not a real trigger, and cannot be
+ *      used when setting, used only to indicate that GTK rekeying is supported
+ *      by the device (flag)
+ * @NL80211_WOWLAN_TRIG_GTK_REKEY_FAILURE: wake up on GTK rekey failure (if
+ *      done by the device) (flag)
+ * @NL80211_WOWLAN_TRIG_EAP_IDENT_REQUEST: wake up on EAP Identity Request
+ *      packet (flag)
+ * @NL80211_WOWLAN_TRIG_4WAY_HANDSHAKE: wake up on 4-way handshake (flag)
+ * @NL80211_WOWLAN_TRIG_RFKILL_RELEASE: wake up when rfkill is released
+ *      (on devices that have rfkill in the device) (flag)
  * @NUM_NL80211_WOWLAN_TRIG: number of wake on wireless triggers
  * @MAX_NL80211_WOWLAN_TRIG: highest wowlan trigger attribute number
  */
@@ -2264,6 +2274,11 @@ enum nl80211_wowlan_triggers {
         NL80211_WOWLAN_TRIG_DISCONNECT,
         NL80211_WOWLAN_TRIG_MAGIC_PKT,
         NL80211_WOWLAN_TRIG_PKT_PATTERN,
+        NL80211_WOWLAN_TRIG_GTK_REKEY_SUPPORTED,
+        NL80211_WOWLAN_TRIG_GTK_REKEY_FAILURE,
+        NL80211_WOWLAN_TRIG_EAP_IDENT_REQUEST,
+        NL80211_WOWLAN_TRIG_4WAY_HANDSHAKE,
+        NL80211_WOWLAN_TRIG_RFKILL_RELEASE,
 
         /* keep last */
         NUM_NL80211_WOWLAN_TRIG,
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 5390e3245a1a..83d5c387755d 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1146,9 +1146,15 @@ struct cfg80211_wowlan_trig_pkt_pattern {
  * @magic_pkt: wake up on receiving magic packet
  * @patterns: wake up on receiving packet matching a pattern
  * @n_patterns: number of patterns
+ * @gtk_rekey_failure: wake up on GTK rekey failure
+ * @eap_identity_req: wake up on EAP identity request packet
+ * @four_way_handshake: wake up on 4-way handshake
+ * @rfkill_release: wake up when rfkill is released
  */
 struct cfg80211_wowlan {
-        bool any, disconnect, magic_pkt;
+        bool any, disconnect, magic_pkt, gtk_rekey_failure,
+             eap_identity_req, four_way_handshake,
+             rfkill_release;
         struct cfg80211_wowlan_trig_pkt_pattern *patterns;
         int n_patterns;
 };
@@ -1673,11 +1679,21 @@ struct ieee80211_txrx_stypes {
  * @WIPHY_WOWLAN_MAGIC_PKT: supports wakeup on magic packet
  *      (see nl80211.h)
  * @WIPHY_WOWLAN_DISCONNECT: supports wakeup on disconnect
+ * @WIPHY_WOWLAN_SUPPORTS_GTK_REKEY: supports GTK rekeying while asleep
+ * @WIPHY_WOWLAN_GTK_REKEY_FAILURE: supports wakeup on GTK rekey failure
+ * @WIPHY_WOWLAN_EAP_IDENTITY_REQ: supports wakeup on EAP identity request
+ * @WIPHY_WOWLAN_4WAY_HANDSHAKE: supports wakeup on 4-way handshake failure
+ * @WIPHY_WOWLAN_RFKILL_RELEASE: supports wakeup on RF-kill release
  */
 enum wiphy_wowlan_support_flags {
-        WIPHY_WOWLAN_ANY        = BIT(0),
-        WIPHY_WOWLAN_MAGIC_PKT  = BIT(1),
-        WIPHY_WOWLAN_DISCONNECT = BIT(2),
+        WIPHY_WOWLAN_ANY                = BIT(0),
+        WIPHY_WOWLAN_MAGIC_PKT          = BIT(1),
+        WIPHY_WOWLAN_DISCONNECT         = BIT(2),
+        WIPHY_WOWLAN_SUPPORTS_GTK_REKEY = BIT(3),
+        WIPHY_WOWLAN_GTK_REKEY_FAILURE  = BIT(4),
+        WIPHY_WOWLAN_EAP_IDENTITY_REQ   = BIT(5),
+        WIPHY_WOWLAN_4WAY_HANDSHAKE     = BIT(6),
+        WIPHY_WOWLAN_RFKILL_RELEASE     = BIT(7),
 };
 
 /**
diff --git a/net/wireless/core.c b/net/wireless/core.c
index 880dbe2e6f94..112959d5256a 100644
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -488,6 +488,10 @@ int wiphy_register(struct wiphy *wiphy)
         int i;
         u16 ifmodes = wiphy->interface_modes;
 
+        if (WARN_ON((wiphy->wowlan.flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
+                    !(wiphy->wowlan.flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
+                return -EINVAL;
+
         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
                 return -EINVAL;
 
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 6a82c898f831..a2e1e49c9196 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -205,6 +205,10 @@ nl80211_wowlan_policy[NUM_NL80211_WOWLAN_TRIG] = {
         [NL80211_WOWLAN_TRIG_DISCONNECT] = { .type = NLA_FLAG },
         [NL80211_WOWLAN_TRIG_MAGIC_PKT] = { .type = NLA_FLAG },
         [NL80211_WOWLAN_TRIG_PKT_PATTERN] = { .type = NLA_NESTED },
+        [NL80211_WOWLAN_TRIG_GTK_REKEY_FAILURE] = { .type = NLA_FLAG },
+        [NL80211_WOWLAN_TRIG_EAP_IDENT_REQUEST] = { .type = NLA_FLAG },
+        [NL80211_WOWLAN_TRIG_4WAY_HANDSHAKE] = { .type = NLA_FLAG },
+        [NL80211_WOWLAN_TRIG_RFKILL_RELEASE] = { .type = NLA_FLAG },
 };
 
 /* policy for GTK rekey offload attributes */
@@ -929,6 +933,16 @@ static int nl80211_send_wiphy(struct sk_buff *msg, u32 pid, u32 seq, int flags,
                         NLA_PUT_FLAG(msg, NL80211_WOWLAN_TRIG_DISCONNECT);
                 if (dev->wiphy.wowlan.flags & WIPHY_WOWLAN_MAGIC_PKT)
                         NLA_PUT_FLAG(msg, NL80211_WOWLAN_TRIG_MAGIC_PKT);
+                if (dev->wiphy.wowlan.flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)
+                        NLA_PUT_FLAG(msg, NL80211_WOWLAN_TRIG_GTK_REKEY_SUPPORTED);
+                if (dev->wiphy.wowlan.flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE)
+                        NLA_PUT_FLAG(msg, NL80211_WOWLAN_TRIG_GTK_REKEY_FAILURE);
+                if (dev->wiphy.wowlan.flags & WIPHY_WOWLAN_EAP_IDENTITY_REQ)
+                        NLA_PUT_FLAG(msg, NL80211_WOWLAN_TRIG_EAP_IDENT_REQUEST);
+                if (dev->wiphy.wowlan.flags & WIPHY_WOWLAN_4WAY_HANDSHAKE)
+                        NLA_PUT_FLAG(msg, NL80211_WOWLAN_TRIG_4WAY_HANDSHAKE);
+                if (dev->wiphy.wowlan.flags & WIPHY_WOWLAN_RFKILL_RELEASE)
+                        NLA_PUT_FLAG(msg, NL80211_WOWLAN_TRIG_RFKILL_RELEASE);
                 if (dev->wiphy.wowlan.n_patterns) {
                         struct nl80211_wowlan_pattern_support pat = {
                                 .max_patterns = dev->wiphy.wowlan.n_patterns,
@@ -5272,6 +5286,14 @@ static int nl80211_get_wowlan(struct sk_buff *skb, struct genl_info *info)
                         NLA_PUT_FLAG(msg, NL80211_WOWLAN_TRIG_DISCONNECT);
                 if (rdev->wowlan->magic_pkt)
                         NLA_PUT_FLAG(msg, NL80211_WOWLAN_TRIG_MAGIC_PKT);
+                if (rdev->wowlan->gtk_rekey_failure)
+                        NLA_PUT_FLAG(msg, NL80211_WOWLAN_TRIG_GTK_REKEY_FAILURE);
+                if (rdev->wowlan->eap_identity_req)
+                        NLA_PUT_FLAG(msg, NL80211_WOWLAN_TRIG_EAP_IDENT_REQUEST);
+                if (rdev->wowlan->four_way_handshake)
+                        NLA_PUT_FLAG(msg, NL80211_WOWLAN_TRIG_4WAY_HANDSHAKE);
+                if (rdev->wowlan->rfkill_release)
+                        NLA_PUT_FLAG(msg, NL80211_WOWLAN_TRIG_RFKILL_RELEASE);
                 if (rdev->wowlan->n_patterns) {
                         struct nlattr *nl_pats, *nl_pat;
                         int i, pat_len;
@@ -5348,6 +5370,33 @@ static int nl80211_set_wowlan(struct sk_buff *skb, struct genl_info *info)
                 new_triggers.magic_pkt = true;
         }
 
+        if (tb[NL80211_WOWLAN_TRIG_GTK_REKEY_SUPPORTED])
+                return -EINVAL;
+
+        if (tb[NL80211_WOWLAN_TRIG_GTK_REKEY_FAILURE]) {
+                if (!(wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE))
+                        return -EINVAL;
+                new_triggers.gtk_rekey_failure = true;
+        }
+
+        if (tb[NL80211_WOWLAN_TRIG_EAP_IDENT_REQUEST]) {
+                if (!(wowlan->flags & WIPHY_WOWLAN_EAP_IDENTITY_REQ))
+                        return -EINVAL;
+                new_triggers.eap_identity_req = true;
+        }
+
+        if (tb[NL80211_WOWLAN_TRIG_4WAY_HANDSHAKE]) {
+                if (!(wowlan->flags & WIPHY_WOWLAN_4WAY_HANDSHAKE))
+                        return -EINVAL;
+                new_triggers.four_way_handshake = true;
+        }
+
+        if (tb[NL80211_WOWLAN_TRIG_RFKILL_RELEASE]) {
+                if (!(wowlan->flags & WIPHY_WOWLAN_RFKILL_RELEASE))
+                        return -EINVAL;
+                new_triggers.rfkill_release = true;
+        }
+
         if (tb[NL80211_WOWLAN_TRIG_PKT_PATTERN]) {
                 struct nlattr *pat;
                 int n_patterns = 0;