This patch fixes my problems with "dynamic wep" (widely used in
universities), and I can successfully associate and transfer data. The
corresponding wpa_supplicant.conf is:
network={
ssid="airsas"
key_mgmt=IEEE8021X
eap=TTLS
anonymous_identity="anon@xxxxxx"
phase2="auth=PAP"
identity="username"
password="password"
}
The patch contains basically two changes:
1) Allow privacy mismatch until associated
2) Decrypt unicast frames with the per-STA key, not making any
assumptions about it being key index 0.
diff -ru linux+mac80211-9.0.3/include/linux/ieee80211.h linux-2.6.22.1/include/linux/ieee80211.h
--- linux+mac80211-9.0.3/include/linux/ieee80211.h 2007-08-06 16:28:48.000000000 -0400
+++ linux-2.6.22.1/include/linux/ieee80211.h 2007-08-07 13:35:18.000000000 -0400
@@ -357,7 +357,7 @@
#define WLAN_CAPABILITY_IBSS (1<<1)
#define WLAN_CAPABILITY_CF_POLLABLE (1<<2)
#define WLAN_CAPABILITY_CF_POLL_REQUEST (1<<3)
-#define WLAN_CAPABILITY_PRIVACY (1<<4)
+#define WLAN_CAPABILITY_PRIVACY (1<<4) /* Force WEP on data packets */
#define WLAN_CAPABILITY_SHORT_PREAMBLE (1<<5)
#define WLAN_CAPABILITY_PBCC (1<<6)
#define WLAN_CAPABILITY_CHANNEL_AGILITY (1<<7)
diff -ru linux+mac80211-9.0.3/net/mac80211/ieee80211.c linux-2.6.22.1/net/mac80211/ieee80211.c
--- linux+mac80211-9.0.3/net/mac80211/ieee80211.c 2007-08-06 16:28:48.000000000 -0400
+++ linux-2.6.22.1/net/mac80211/ieee80211.c 2007-08-09 20:03:07.000000000 -0400
@@ -3488,7 +3488,6 @@
ieee80211_rx_h_check(struct ieee80211_txrx_data *rx)
{
struct ieee80211_hdr *hdr;
- int always_sta_key;
hdr = (struct ieee80211_hdr *) rx->skb->data;
/* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
@@ -3556,29 +3555,23 @@
return TXRX_QUEUED;
}
- if (rx->sdata->type == IEEE80211_IF_TYPE_STA)
- always_sta_key = 0;
- else
- always_sta_key = 1;
+ if (rx->fc & IEEE80211_FCTL_PROTECTED && /* WEP */
+ (rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV)) {
+
+ if (rx->skb->pkt_type == PACKET_HOST &&
+ rx->sta && rx->sta->key) {
- if (rx->sta && rx->sta->key && always_sta_key) {
- rx->key = rx->sta->key;
- } else {
- if (rx->sta && rx->sta->key)
rx->key = rx->sta->key;
- else
- rx->key = rx->sdata->default_key;
- if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) &&
- rx->fc & IEEE80211_FCTL_PROTECTED) {
+ } else {
int keyidx = ieee80211_wep_get_keyidx(rx->skb);
+ if (keyidx < 0 || keyidx >= NUM_DEFAULT_KEYS)
+ return TXRX_DROP;
+
+ rx->key = rx->sdata->keys[keyidx];
- if (keyidx >= 0 && keyidx < NUM_DEFAULT_KEYS &&
- (!rx->sta || !rx->sta->key || keyidx > 0))
- rx->key = rx->sdata->keys[keyidx];
-
- if (!rx->key) {
- if (!rx->u.rx.ra_match)
+ if (unlikely(!rx->key)) {
+ if (!rx->u.rx.ra_match)
return TXRX_DROP;
printk(KERN_DEBUG "%s: RX WEP frame with "
"unknown keyidx %d (A1=" MAC_FMT " A2="
@@ -3587,14 +3580,21 @@
MAC_ARG(hdr->addr1),
MAC_ARG(hdr->addr2),
MAC_ARG(hdr->addr3));
- if (!rx->local->apdev)
+ if (!rx->local->apdev) {
+ rx->local->dot11WEPUndecryptableCount++;
return TXRX_DROP;
+ }
ieee80211_rx_mgmt(
rx->local, rx->skb, rx->u.rx.status,
ieee80211_msg_wep_frame_unknown_key);
return TXRX_QUEUED;
}
}
+ } else { /* No WEP */
+ if (rx->sta && rx->sta->key)
+ rx->key = rx->sta->key;
+ else
+ rx->key = rx->sdata->default_key;
}
if (rx->fc & IEEE80211_FCTL_PROTECTED && rx->key && rx->u.rx.ra_match) {
diff -ru linux+mac80211-9.0.3/net/mac80211/ieee80211_ioctl.c linux-2.6.22.1/net/mac80211/ieee80211_ioctl.c
--- linux+mac80211-9.0.3/net/mac80211/ieee80211_ioctl.c 2007-08-06 16:28:48.000000000 -0400
+++ linux-2.6.22.1/net/mac80211/ieee80211_ioctl.c 2007-08-09 19:01:56.000000000 -0400
@@ -479,13 +479,14 @@
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
- if (is_broadcast_ether_addr(sta_addr)) {
+ if (idx < 0 || idx >= NUM_DEFAULT_KEYS) {
+ printk(KERN_DEBUG "%s: set_encrypt - invalid idx = %d\n",
+ dev->name, idx);
+ return -EINVAL;
+ }
+
+ if (is_multicast_ether_addr(sta_addr)) {
sta = NULL;
- if (idx >= NUM_DEFAULT_KEYS) {
- printk(KERN_DEBUG "%s: set_encrypt - invalid idx=%d\n",
- dev->name, idx);
- return -EINVAL;
- }
key = sdata->keys[idx];
/* TODO: consider adding hwaccel support for these; at least
@@ -499,7 +500,7 @@
* being, this can be only set at compile time. */
} else {
set_tx_key = 0;
- if (idx != 0) {
+ if (idx != 0 && alg != ALG_WEP) {
printk(KERN_DEBUG "%s: set_encrypt - non-zero idx for "
"individual key\n", dev->name);
return -EINVAL;
diff -ru linux+mac80211-9.0.3/net/mac80211/ieee80211_sta.c linux-2.6.22.1/net/mac80211/ieee80211_sta.c
--- linux+mac80211-9.0.3/net/mac80211/ieee80211_sta.c 2007-08-06 16:28:48.000000000 -0400
+++ linux-2.6.22.1/net/mac80211/ieee80211_sta.c 2007-08-07 15:01:31.000000000 -0400
@@ -1131,10 +1131,11 @@
bss = ieee80211_rx_bss_get(dev, ifsta->bssid);
if (!bss)
return 0;
-
- if (ieee80211_sta_wep_configured(dev) !=
- !!(bss->capability & WLAN_CAPABILITY_PRIVACY))
- res = 1;
+
+ if (ifsta->associated && ieee80211_sta_wep_configured(dev) !=
+ !!(bss->capability & WLAN_CAPABILITY_PRIVACY)) {
+ res = 1; /* associated and WEP encryption mismatch */
+ }
ieee80211_rx_bss_put(dev, bss);
-
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