diff mbox

[2/2] mac80211: reply to AUTH frame with a DEAUTH if sta allocation fails

Message ID 1345995273-27358-2-git-send-email-ordex@autistici.org (mailing list archive)
State Not Applicable, archived
Headers show

Commit Message

Antonio Quartulli Aug. 26, 2012, 3:34 p.m. UTC
Whenever a host gets an AUTH frame it first allocates a new station and then
replies with another AUTH frame. However, if sta allocations fails the host
should send a DEAUTH frame instead to tell the other end that something went
wrong

Signed-off-by: Antonio Quartulli <ordex@autistici.org>
---
 net/mac80211/ibss.c | 33 ++++++++++++++++++++++++++++++++-
 1 file changed, 32 insertions(+), 1 deletion(-)

Comments

Johannes Berg Sept. 5, 2012, 1:58 p.m. UTC | #1
On Sun, 2012-08-26 at 17:34 +0200, Antonio Quartulli wrote:
> Whenever a host gets an AUTH frame it first allocates a new station and then
> replies with another AUTH frame. However, if sta allocations fails the host
> should send a DEAUTH frame instead to tell the other end that something went
> wrong

Well, ok, but...

>  	/*
> +	 * if we have any problem in allocating the new station, we reply with a
> +	 * DEAUTH frame to tell the other end that we had a problem
> +	 */
> +	if (!sta) {
> +		ieee80211_send_deauth_disassoc(sdata, sdata->u.ibss.bssid,
> +					       IEEE80211_STYPE_DEAUTH,
> +					       WLAN_REASON_UNSPECIFIED, true,
> +					       deauth_frame_buf);

You can't call the function in IBSS mode, it accesses sdata->u.mgd. You
should probably fix that in the first patch and make it conditional on
the sdata->vif.type actually being station mode.

johannes

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Antonio Quartulli Sept. 5, 2012, 2:37 p.m. UTC | #2
On Wed, Sep 05, 2012 at 03:58:23 +0200, Johannes Berg wrote:
> On Sun, 2012-08-26 at 17:34 +0200, Antonio Quartulli wrote:
> > Whenever a host gets an AUTH frame it first allocates a new station and then
> > replies with another AUTH frame. However, if sta allocations fails the host
> > should send a DEAUTH frame instead to tell the other end that something went
> > wrong
> 
> Well, ok, but...
> 
> >  	/*
> > +	 * if we have any problem in allocating the new station, we reply with a
> > +	 * DEAUTH frame to tell the other end that we had a problem
> > +	 */
> > +	if (!sta) {
> > +		ieee80211_send_deauth_disassoc(sdata, sdata->u.ibss.bssid,
> > +					       IEEE80211_STYPE_DEAUTH,
> > +					       WLAN_REASON_UNSPECIFIED, true,
> > +					       deauth_frame_buf);
> 
> You can't call the function in IBSS mode, it accesses sdata->u.mgd. You
> should probably fix that in the first patch and make it conditional on
> the sdata->vif.type actually being station mode.

argh ok. I see the problem. Will fix and send v2.

Thank you
diff mbox

Patch

diff --git a/net/mac80211/ibss.c b/net/mac80211/ibss.c
index a9d9328..7c08251 100644
--- a/net/mac80211/ibss.c
+++ b/net/mac80211/ibss.c
@@ -332,11 +332,27 @@  ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
 	return ieee80211_ibss_finish_sta(sta, auth);
 }
 
+static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
+					  struct ieee80211_mgmt *mgmt,
+					  size_t len)
+{
+	u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);
+
+	if (len < IEEE80211_DEAUTH_FRAME_LEN)
+		return;
+
+	ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
+		 mgmt->sa, mgmt->da, mgmt->bssid, reason);
+	sta_info_destroy_addr(sdata, mgmt->sa);
+}
+
 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
 					struct ieee80211_mgmt *mgmt,
 					size_t len)
 {
 	u16 auth_alg, auth_transaction;
+	struct sta_info *sta;
+	u8 deauth_frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
 
 	lockdep_assert_held(&sdata->u.ibss.mtx);
 
@@ -352,10 +368,22 @@  static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
 		 "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
 		 mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
 	sta_info_destroy_addr(sdata, mgmt->sa);
-	ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 0, false);
+	sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 0, false);
 	rcu_read_unlock();
 
 	/*
+	 * if we have any problem in allocating the new station, we reply with a
+	 * DEAUTH frame to tell the other end that we had a problem
+	 */
+	if (!sta) {
+		ieee80211_send_deauth_disassoc(sdata, sdata->u.ibss.bssid,
+					       IEEE80211_STYPE_DEAUTH,
+					       WLAN_REASON_UNSPECIFIED, true,
+					       deauth_frame_buf);
+		return;
+	}
+
+	/*
 	 * IEEE 802.11 standard does not require authentication in IBSS
 	 * networks and most implementations do not seem to use it.
 	 * However, try to reply to authentication attempts if someone
@@ -902,6 +930,9 @@  void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
 	case IEEE80211_STYPE_AUTH:
 		ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
 		break;
+	case IEEE80211_STYPE_DEAUTH:
+		ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
+		break;
 	}
 
  mgmt_out: