RFC/PATCH: Allow wpa_supplicant to share scan results.

Ben Greear greearb at candelatech.com
Tue Nov 16 15:39:59 EST 2010


Please let me know if this is moving in the right direction.  The
ath9k crash actually killed my file-system, so still re-installing
the OS on my test box...  This code is un-tested, but it does compile.

diff --git a/src/drivers/driver.h b/src/drivers/driver.h
index aef8554..0f81b41 100644
--- a/src/drivers/driver.h
+++ b/src/drivers/driver.h
@@ -718,6 +718,11 @@ struct wpa_driver_ops {
  	 */
  	int (*get_ssid)(void *priv, u8 *ssid);

+	/** Return the physical radio name for this device, if known.
+	 * The returned data must not be modified by the caller.
+	 */
+	const char* (*get_radio_name)(void *priv);
+
  	/**
  	 * set_key - Configure encryption key
  	 * @ifname: Interface name (for multi-SSID/VLAN support)
diff --git a/src/drivers/driver_nl80211.c b/src/drivers/driver_nl80211.c
index 51bf446..ec9b0be 100644
--- a/src/drivers/driver_nl80211.c
+++ b/src/drivers/driver_nl80211.c
@@ -18,6 +18,9 @@

  #include "includes.h"
  #include <sys/ioctl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
  #include <net/if.h>
  #include <netlink/genl/genl.h>
  #include <netlink/genl/family.h>
@@ -27,6 +30,7 @@
  #include <linux/filter.h>
  #include "nl80211_copy.h"

+
  #include "common.h"
  #include "eloop.h"
  #include "common/ieee802_11_defs.h"
@@ -104,6 +108,7 @@ struct i802_bss {
  	struct i802_bss *next;
  	int ifindex;
  	char ifname[IFNAMSIZ + 1];
+	char phyname[32];
  	unsigned int beacon_set:1;
  };

@@ -364,6 +369,12 @@ static int wpa_driver_nl80211_get_ssid(void *priv, u8 *ssid)
  	return drv->ssid_len;
  }

+static const char *wpa_driver_nl80211_get_radio_name(void *priv)
+{
+	struct i802_bss *bss = priv;
+	return bss->phyname;
+}
+

  static void wpa_driver_nl80211_event_link(struct wpa_driver_nl80211_data *drv,
  					  char *buf, size_t len, int del)
@@ -1673,6 +1684,29 @@ static void * wpa_driver_nl80211_init(void *ctx, const char *ifname)
  		return NULL;
  	}

+	/* Find phy this interface belongs to. */
+	{
+		char buf[90];
+		int f;
+		int rv;
+
+		bss->phyname[0] = 0;
+		snprintf(buf, sizeof(buf) - 1, "/sys/class/net/%s/phy80211/name", ifname);
+		f = open(buf, O_RDONLY);
+		if (f < 0)
+			wpa_printf(MSG_DEBUG, "Could not open file: %s, error: %s",
+				   buf, strerror(errno));
+		else {
+			rv = read(f, bss->phyname, sizeof(bss->phyname) - 1);
+			close(f);
+			if (rv < 0)
+				wpa_printf(MSG_DEBUG, "Could not read file: %s  error: %s",
+					   buf, strerror(errno));
+			else
+				bss->phyname[rv] = 0;
+		}
+	}
+
  	drv->ioctl_sock = socket(PF_INET, SOCK_DGRAM, 0);
  	if (drv->ioctl_sock < 0) {
  		perror("socket(PF_INET,SOCK_DGRAM)");
@@ -5952,6 +5986,7 @@ const struct wpa_driver_ops wpa_driver_nl80211_ops = {
  	.desc = "Linux nl80211/cfg80211",
  	.get_bssid = wpa_driver_nl80211_get_bssid,
  	.get_ssid = wpa_driver_nl80211_get_ssid,
+	.get_radio_name = wpa_driver_nl80211_get_radio_name,
  	.set_key = wpa_driver_nl80211_set_key,
  	.scan2 = wpa_driver_nl80211_scan,
  	.get_scan_results2 = wpa_driver_nl80211_get_scan_results,
diff --git a/wpa_supplicant/events.c b/wpa_supplicant/events.c
index 39ac33b..d7d2227 100644
--- a/wpa_supplicant/events.c
+++ b/wpa_supplicant/events.c
@@ -44,7 +44,6 @@
  #include "mlme.h"
  #include "scan.h"

-
  static int wpa_supplicant_select_config(struct wpa_supplicant *wpa_s)
  {
  	struct wpa_ssid *ssid, *old_ssid;
@@ -810,8 +809,7 @@ static int wpa_supplicant_need_to_roam(struct wpa_supplicant *wpa_s,
  	return 1;
  }

-
-static void wpa_supplicant_event_scan_results(struct wpa_supplicant *wpa_s,
+static void _wpa_supplicant_event_scan_results(struct wpa_supplicant *wpa_s,
  					      union wpa_event_data *data)
  {
  	struct wpa_bss *selected;
@@ -851,7 +849,7 @@ static void wpa_supplicant_event_scan_results(struct wpa_supplicant *wpa_s,
  		return;
  	}

-	wpa_printf(MSG_DEBUG, "New scan results available");
+	wpa_printf(MSG_DEBUG, "%s: New scan results available", wpa_s->ifname);
  	wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
  	wpas_notify_scan_results(wpa_s);

@@ -910,6 +908,46 @@ static void wpa_supplicant_event_scan_results(struct wpa_supplicant *wpa_s,
  		}
  	}
  }
+
+static void wpa_supplicant_event_scan_results(struct wpa_supplicant *wpa_s,
+					      union wpa_event_data *data)
+{
+	const char* rn = NULL;
+	_wpa_supplicant_event_scan_results(wpa_s, data);
+	
+	if (wpa_s->driver->get_radio_name) {
+		rn = wpa_s->driver->get_radio_name(wpa_s->drv_priv);
+	}
+
+	if (rn && rn[0]) {
+		struct wpa_supplicant *ifs;
+		wpa_printf(MSG_DEBUG, "%s: Checking for peer VIFS in event_scan_results.\n",
+			   wpa_s->ifname);
+
+		/* Ok, we know our phy...now check other interfaces
+		 * to see if they have the same phy.  If so, they get
+		 * updated with this same scan info.
+		 */
+		ifs = wpa_s->global->ifaces;
+		while (ifs) {
+			if ((ifs == wpa_s) ||
+			    !ifs->driver->get_radio_name)
+				ifs = ifs->next;
+			else {
+				const char* rn2;
+				rn2 = ifs->driver->get_radio_name(ifs->drv_priv);
+				if (rn2 && (strcmp(rn, rn2) == 0)) {
+					wpa_printf(MSG_DEBUG, "%s: Updating scan results from peer.",
+						   ifs->ifname);
+					/* Got a winner! */
+					_wpa_supplicant_event_scan_results(ifs, data);
+				}
+				ifs = ifs->next;
+			}
+		}
+	}
+}
+
  #endif /* CONFIG_NO_SCAN_PROCESSING */


diff --git a/wpa_supplicant/wpa_supplicant.c b/wpa_supplicant/wpa_supplicant.c
index 0a603af..64f0ef5 100644
--- a/wpa_supplicant/wpa_supplicant.c
+++ b/wpa_supplicant/wpa_supplicant.c
@@ -530,8 +530,8 @@ void wpa_supplicant_set_state(struct wpa_supplicant *wpa_s,
  {
  	enum wpa_states old_state = wpa_s->wpa_state;

-	wpa_printf(MSG_DEBUG, "State: %s -> %s",
-		   wpa_supplicant_state_txt(wpa_s->wpa_state),
+	wpa_printf(MSG_DEBUG, "%s: State: %s -> %s",
+		   wpa_s->ifname, wpa_supplicant_state_txt(wpa_s->wpa_state),
  		   wpa_supplicant_state_txt(state));

  	if (state != WPA_SCANNING)

-- 
Ben Greear <greearb at candelatech.com>
Candela Technologies Inc  http://www.candelatech.com

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