Patchwork [PATCH-resent] nl80211: Run TKIP countermeasures in correct hostapd_data context

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Submitter Sven Eckelmann
Date Dec. 20, 2012, 6:08 p.m.
Message ID <1356026890-2775-1-git-send-email-sven@open-mesh.com>
Download mbox | patch
Permalink /patch/207694/
State Accepted
Commit a5e1eb2092953e4a7717a547cbe0ccb2457e6ce0
Headers show

Comments

Sven Eckelmann - Dec. 20, 2012, 6:08 p.m.
From: Sven Eckelmann <sven@open-mesh.com>

hostapd can run with different VIF when using nl80211. Events about MIC
failures have to be processed in context of the VIF which received it and not
in context of the primary VIF. Otherwise the station belonging to this VIF may
not be found in the primary VIF station hash and therefore no countermeasures
are started or the countermeasures are started for the wrong VIF.

Signed-hostap: Sven Eckelmann <sven@open-mesh.com>
Signed-hostap: Simon Wunderlich <simon@open-mesh.com>
---
 src/drivers/driver_nl80211.c |   44 ++++++++++++++++++++++++++++--------------
 1 file changed, 29 insertions(+), 15 deletions(-)
Jouni Malinen - Dec. 22, 2012, 2:21 p.m.
On Thu, Dec 20, 2012 at 07:08:10PM +0100, sven@open-mesh.com wrote:
> hostapd can run with different VIF when using nl80211. Events about MIC
> failures have to be processed in context of the VIF which received it and not
> in context of the primary VIF. Otherwise the station belonging to this VIF may
> not be found in the primary VIF station hash and therefore no countermeasures
> are started or the countermeasures are started for the wrong VIF.

Thanks! Applied.

Did you happen to look at whether similar change would be needed for any
other event in similar secondary-VIF case?
Sven Eckelmann - Jan. 2, 2013, 11 a.m.
On Thursday 20 December 2012 19:08:10 you wrote:
> Did you happen to look at whether similar change would be needed for any
> other event in similar secondary-VIF case?

I never did a complete review, but looked at some events which seem to be 
important to me and they seemed to be processed correctly. But I still think 
there are similar problems related to switching of VIF on the same physical AP 
when running at least one as WPA/RSN-PSK (just use our beloved iWare device 
and switch between these two a couple of times). This one could be related.

Kind regards,
	Sven

Patch

diff --git a/src/drivers/driver_nl80211.c b/src/drivers/driver_nl80211.c
index 297f677..a8143e5 100644
--- a/src/drivers/driver_nl80211.c
+++ b/src/drivers/driver_nl80211.c
@@ -201,6 +201,7 @@  struct i802_bss {
 
 	int freq;
 
+	void *ctx;
 	struct nl_handle *nl_preq, *nl_mgmt;
 	struct nl_cb *nl_cb;
 
@@ -1529,7 +1530,7 @@  static void mlme_event(struct wpa_driver_nl80211_data *drv,
 }
 
 
-static void mlme_event_michael_mic_failure(struct wpa_driver_nl80211_data *drv,
+static void mlme_event_michael_mic_failure(struct i802_bss *bss,
 					   struct nlattr *tb[])
 {
 	union wpa_event_data data;
@@ -1561,7 +1562,7 @@  static void mlme_event_michael_mic_failure(struct wpa_driver_nl80211_data *drv,
 		wpa_printf(MSG_DEBUG, "nl80211: Key Id %d", key_id);
 	}
 
-	wpa_supplicant_event(drv->ctx, EVENT_MICHAEL_MIC_FAILURE, &data);
+	wpa_supplicant_event(bss->ctx, EVENT_MICHAEL_MIC_FAILURE, &data);
 }
 
 
@@ -2168,9 +2169,11 @@  static void nl80211_spurious_frame(struct i802_bss *bss, struct nlattr **tb,
 }
 
 
-static void do_process_drv_event(struct wpa_driver_nl80211_data *drv,
-				 int cmd, struct nlattr **tb)
+static void do_process_drv_event(struct i802_bss *bss, int cmd,
+				 struct nlattr **tb)
 {
+	struct wpa_driver_nl80211_data *drv = bss->drv;
+
 	if (drv->ap_scan_as_station != NL80211_IFTYPE_UNSPECIFIED &&
 	    (cmd == NL80211_CMD_NEW_SCAN_RESULTS ||
 	     cmd == NL80211_CMD_SCAN_ABORTED)) {
@@ -2243,7 +2246,7 @@  static void do_process_drv_event(struct wpa_driver_nl80211_data *drv,
 				      tb[NL80211_ATTR_DISCONNECTED_BY_AP]);
 		break;
 	case NL80211_CMD_MICHAEL_MIC_FAILURE:
-		mlme_event_michael_mic_failure(drv, tb);
+		mlme_event_michael_mic_failure(bss, tb);
 		break;
 	case NL80211_CMD_JOIN_IBSS:
 		mlme_event_join_ibss(drv, tb);
@@ -2298,21 +2301,25 @@  static int process_drv_event(struct nl_msg *msg, void *arg)
 	struct wpa_driver_nl80211_data *drv = arg;
 	struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
 	struct nlattr *tb[NL80211_ATTR_MAX + 1];
+	struct i802_bss *bss;
+	int ifidx = -1;
 
 	nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
 		  genlmsg_attrlen(gnlh, 0), NULL);
 
-	if (tb[NL80211_ATTR_IFINDEX]) {
-		int ifindex = nla_get_u32(tb[NL80211_ATTR_IFINDEX]);
-		if (ifindex != drv->ifindex && !have_ifidx(drv, ifindex)) {
-			wpa_printf(MSG_DEBUG, "nl80211: Ignored event (cmd=%d)"
-				   " for foreign interface (ifindex %d)",
-				   gnlh->cmd, ifindex);
+	if (tb[NL80211_ATTR_IFINDEX])
+		ifidx = nla_get_u32(tb[NL80211_ATTR_IFINDEX]);
+
+	for (bss = &drv->first_bss; bss; bss = bss->next) {
+		if (ifidx == -1 || ifidx == bss->ifindex) {
+			do_process_drv_event(bss, gnlh->cmd, tb);
 			return NL_SKIP;
 		}
 	}
 
-	do_process_drv_event(drv, gnlh->cmd, tb);
+	wpa_printf(MSG_DEBUG, "nl80211: Ignored event (cmd=%d)"
+			      " for foreign interface (ifindex %d)",
+		   gnlh->cmd, ifidx);
 	return NL_SKIP;
 }
 
@@ -2324,6 +2331,7 @@  static int process_global_event(struct nl_msg *msg, void *arg)
 	struct nlattr *tb[NL80211_ATTR_MAX + 1];
 	struct wpa_driver_nl80211_data *drv, *tmp;
 	int ifidx = -1;
+	struct i802_bss *bss;
 
 	nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
 		  genlmsg_attrlen(gnlh, 0), NULL);
@@ -2333,9 +2341,12 @@  static int process_global_event(struct nl_msg *msg, void *arg)
 
 	dl_list_for_each_safe(drv, tmp, &global->interfaces,
 			      struct wpa_driver_nl80211_data, list) {
-		if (ifidx == -1 || ifidx == drv->ifindex ||
-		    have_ifidx(drv, ifidx))
-			do_process_drv_event(drv, gnlh->cmd, tb);
+		for (bss = &drv->first_bss; bss; bss = bss->next) {
+			if (ifidx == -1 || ifidx == bss->ifindex) {
+				do_process_drv_event(bss, gnlh->cmd, tb);
+				return NL_SKIP;
+			}
+		}
 	}
 
 	return NL_SKIP;
@@ -3069,6 +3080,8 @@  static void * wpa_driver_nl80211_init(void *ctx, const char *ifname,
 	drv->ctx = ctx;
 	bss = &drv->first_bss;
 	bss->drv = drv;
+	bss->ctx = ctx;
+
 	os_strlcpy(bss->ifname, ifname, sizeof(bss->ifname));
 	drv->monitor_ifidx = -1;
 	drv->monitor_sock = -1;
@@ -8106,6 +8119,7 @@  static int wpa_driver_nl80211_if_add(void *priv, enum wpa_driver_if_type type,
 		new_bss->drv = drv;
 		new_bss->next = drv->first_bss.next;
 		new_bss->freq = drv->first_bss.freq;
+		new_bss->ctx = bss_ctx;
 		drv->first_bss.next = new_bss;
 		if (drv_priv)
 			*drv_priv = new_bss;