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wext: Add cfg80211-specific optimization to avoid silly behavior

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If the driver is detected to use cfg80211, we can rely on it being able
to disconnect with SIOCSIWMLME commands and to use empty SSID as a way
to stop it from associating when we are in progress of configuring the
driver for association. Consequently, we can remove the hack that uses
random 32-octet SSID to force disconnection and re-order association
commands to match the expectations that cfg80211 has for WEXT ioctls.
This gets rid of extra scan rounds and attempts to associate with the
silly 32-octet SSID.
This commit is contained in:
Jouni Malinen 2010-01-12 20:01:09 +02:00
parent b0d77f43f7
commit 3145e6154c
2 changed files with 39 additions and 3 deletions
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40
src/drivers/driver_wext.c
View file

@ -1,6 +1,6 @@
/*
* WPA Supplicant - driver interaction with generic Linux Wireless Extensions
* Copyright (c) 2003-2007, Jouni Malinen <j@w1.fi>
* Driver interaction with generic Linux Wireless Extensions
* Copyright (c) 2003-2010, Jouni Malinen <j@w1.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@ -20,6 +20,7 @@
#include "includes.h"
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <net/if_arp.h>
#include "wireless_copy.h"
@ -697,6 +698,8 @@ void * wpa_driver_wext_init(void *ctx, const char *ifname)
{
struct wpa_driver_wext_data *drv;
struct netlink_config *cfg;
char path[128];
struct stat buf;
drv = os_zalloc(sizeof(*drv));
if (drv == NULL)
@ -704,6 +707,12 @@ void * wpa_driver_wext_init(void *ctx, const char *ifname)
drv->ctx = ctx;
os_strlcpy(drv->ifname, ifname, sizeof(drv->ifname));
os_snprintf(path, sizeof(path), "/sys/class/net/%s/phy80211", ifname);
if (stat(path, &buf) == 0) {
wpa_printf(MSG_DEBUG, "WEXT: cfg80211-based driver detected");
drv->cfg80211 = 1;
}
drv->ioctl_sock = socket(PF_INET, SOCK_DGRAM, 0);
if (drv->ioctl_sock < 0) {
perror("socket(PF_INET,SOCK_DGRAM)");
@ -1709,6 +1718,19 @@ static void wpa_driver_wext_disconnect(struct wpa_driver_wext_data *drv)
}
if (iwr.u.mode == IW_MODE_INFRA) {
if (drv->cfg80211) {
/*
* cfg80211 supports SIOCSIWMLME commands, so there is
* no need for the random SSID hack, but clear the
* BSSID and SSID.
*/
if (wpa_driver_wext_set_bssid(drv, null_bssid) < 0 ||
wpa_driver_wext_set_ssid(drv, (u8 *) "", 0) < 0) {
wpa_printf(MSG_DEBUG, "WEXT: Failed to clear "
"to disconnect");
}
return;
}
/*
* Clear the BSSID selection and set a random SSID to make sure
* the driver will not be trying to associate with something
@ -1858,6 +1880,14 @@ int wpa_driver_wext_associate(void *priv,
wpa_printf(MSG_DEBUG, "%s", __FUNCTION__);
if (drv->cfg80211) {
/*
* Stop cfg80211 from trying to associate before we are done
* with all parameters.
*/
wpa_driver_wext_set_ssid(drv, (u8 *) "", 0);
}
if (wpa_driver_wext_set_drop_unencrypted(drv, params->drop_unencrypted)
< 0)
ret = -1;
@ -1945,11 +1975,15 @@ int wpa_driver_wext_associate(void *priv,
#endif /* CONFIG_IEEE80211W */
if (params->freq && wpa_driver_wext_set_freq(drv, params->freq) < 0)
ret = -1;
if (wpa_driver_wext_set_ssid(drv, params->ssid, params->ssid_len) < 0)
if (!drv->cfg80211 &&
wpa_driver_wext_set_ssid(drv, params->ssid, params->ssid_len) < 0)
ret = -1;
if (params->bssid &&
wpa_driver_wext_set_bssid(drv, params->bssid) < 0)
ret = -1;
if (drv->cfg80211 &&
wpa_driver_wext_set_ssid(drv, params->ssid, params->ssid_len) < 0)
ret = -1;
return ret;
}

2
src/drivers/driver_wext.h
View file

@ -43,6 +43,8 @@ struct wpa_driver_wext_data {
char mlmedev[IFNAMSIZ + 1];
int scan_complete_events;
int cfg80211; /* whether driver is using cfg80211 */
};
int wpa_driver_wext_get_bssid(void *priv, u8 *bssid);