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[PATCH] mac80211: store SSID in sta_bss_list

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Some AP equipment "in the wild" services multiple SSIDs using the
same BSSID.  This patch changes the key of sta_bss_list to include
the SSID as well as the BSSID and the channel so as to prevent one
SSID from eclipsing another SSID with the same BSSID.

Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
John W. Linville 2007-10-05 14:23:27 -04:00
parent 65c107ab3b
commit cffdd30d20
1 changed files with 33 additions and 21 deletions
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54
net/mac80211/ieee80211_sta.c
View file

@ -12,7 +12,6 @@
*/ */
/* TODO: /* TODO:
* BSS table: use <BSSID,SSID> as the key to support multi-SSID APs
* order BSS list by RSSI(?) ("quality of AP") * order BSS list by RSSI(?) ("quality of AP")
* scan result table filtering (by capability (privacy, IBSS/BSS, WPA/RSN IE, * scan result table filtering (by capability (privacy, IBSS/BSS, WPA/RSN IE,
* SSID) * SSID)
@ -61,7 +60,8 @@
static void ieee80211_send_probe_req(struct net_device *dev, u8 *dst, static void ieee80211_send_probe_req(struct net_device *dev, u8 *dst,
u8 *ssid, size_t ssid_len); u8 *ssid, size_t ssid_len);
static struct ieee80211_sta_bss * static struct ieee80211_sta_bss *
ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid, int channel); ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid, int channel,
u8 *ssid, u8 ssid_len);
static void ieee80211_rx_bss_put(struct net_device *dev, static void ieee80211_rx_bss_put(struct net_device *dev,
struct ieee80211_sta_bss *bss); struct ieee80211_sta_bss *bss);
static int ieee80211_sta_find_ibss(struct net_device *dev, static int ieee80211_sta_find_ibss(struct net_device *dev,
@ -428,7 +428,8 @@ static void ieee80211_set_associated(struct net_device *dev,
return; return;
bss = ieee80211_rx_bss_get(dev, ifsta->bssid, bss = ieee80211_rx_bss_get(dev, ifsta->bssid,
local->hw.conf.channel); local->hw.conf.channel,
ifsta->ssid, ifsta->ssid_len);
if (bss) { if (bss) {
if (bss->has_erp_value) if (bss->has_erp_value)
ieee80211_handle_erp_ie(dev, bss->erp_value); ieee80211_handle_erp_ie(dev, bss->erp_value);
@ -575,7 +576,8 @@ static void ieee80211_send_assoc(struct net_device *dev,
capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME | capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME |
WLAN_CAPABILITY_SHORT_PREAMBLE; WLAN_CAPABILITY_SHORT_PREAMBLE;
} }
bss = ieee80211_rx_bss_get(dev, ifsta->bssid, local->hw.conf.channel); bss = ieee80211_rx_bss_get(dev, ifsta->bssid, local->hw.conf.channel,
ifsta->ssid, ifsta->ssid_len);
if (bss) { if (bss) {
if (bss->capability & WLAN_CAPABILITY_PRIVACY) if (bss->capability & WLAN_CAPABILITY_PRIVACY)
capab |= WLAN_CAPABILITY_PRIVACY; capab |= WLAN_CAPABILITY_PRIVACY;
@ -731,7 +733,8 @@ static int ieee80211_privacy_mismatch(struct net_device *dev,
ifsta->key_management_enabled) ifsta->key_management_enabled)
return 0; return 0;
bss = ieee80211_rx_bss_get(dev, ifsta->bssid, local->hw.conf.channel); bss = ieee80211_rx_bss_get(dev, ifsta->bssid, local->hw.conf.channel,
ifsta->ssid, ifsta->ssid_len);
if (!bss) if (!bss)
return 0; return 0;
@ -1245,7 +1248,8 @@ static void ieee80211_rx_mgmt_assoc_resp(struct net_device *dev,
if (elems.erp_info && elems.erp_info_len >= 1) { if (elems.erp_info && elems.erp_info_len >= 1) {
struct ieee80211_sta_bss *bss struct ieee80211_sta_bss *bss
= ieee80211_rx_bss_get(dev, ifsta->bssid, = ieee80211_rx_bss_get(dev, ifsta->bssid,
local->hw.conf.channel); local->hw.conf.channel,
ifsta->ssid, ifsta->ssid_len);
if (bss) { if (bss) {
bss->erp_value = elems.erp_info[0]; bss->erp_value = elems.erp_info[0];
bss->has_erp_value = 1; bss->has_erp_value = 1;
@ -1276,7 +1280,8 @@ static void ieee80211_rx_mgmt_assoc_resp(struct net_device *dev,
return; return;
} }
bss = ieee80211_rx_bss_get(dev, ifsta->bssid, bss = ieee80211_rx_bss_get(dev, ifsta->bssid,
local->hw.conf.channel); local->hw.conf.channel,
ifsta->ssid, ifsta->ssid_len);
if (bss) { if (bss) {
sta->last_rssi = bss->rssi; sta->last_rssi = bss->rssi;
sta->last_signal = bss->signal; sta->last_signal = bss->signal;
@ -1352,7 +1357,8 @@ static void __ieee80211_rx_bss_hash_del(struct net_device *dev,
static struct ieee80211_sta_bss * static struct ieee80211_sta_bss *
ieee80211_rx_bss_add(struct net_device *dev, u8 *bssid, int channel) ieee80211_rx_bss_add(struct net_device *dev, u8 *bssid, int channel,
u8 *ssid, u8 ssid_len)
{ {
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_sta_bss *bss; struct ieee80211_sta_bss *bss;
@ -1364,6 +1370,10 @@ ieee80211_rx_bss_add(struct net_device *dev, u8 *bssid, int channel)
atomic_inc(&bss->users); atomic_inc(&bss->users);
memcpy(bss->bssid, bssid, ETH_ALEN); memcpy(bss->bssid, bssid, ETH_ALEN);
bss->channel = channel; bss->channel = channel;
if (ssid && ssid_len <= IEEE80211_MAX_SSID_LEN) {
memcpy(bss->ssid, ssid, ssid_len);
bss->ssid_len = ssid_len;
}
spin_lock_bh(&local->sta_bss_lock); spin_lock_bh(&local->sta_bss_lock);
/* TODO: order by RSSI? */ /* TODO: order by RSSI? */
@ -1375,7 +1385,8 @@ ieee80211_rx_bss_add(struct net_device *dev, u8 *bssid, int channel)
static struct ieee80211_sta_bss * static struct ieee80211_sta_bss *
ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid, int channel) ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid, int channel,
u8 *ssid, u8 ssid_len)
{ {
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_sta_bss *bss; struct ieee80211_sta_bss *bss;
@ -1383,8 +1394,10 @@ ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid, int channel)
spin_lock_bh(&local->sta_bss_lock); spin_lock_bh(&local->sta_bss_lock);
bss = local->sta_bss_hash[STA_HASH(bssid)]; bss = local->sta_bss_hash[STA_HASH(bssid)];
while (bss) { while (bss) {
if (memcmp(bss->bssid, bssid, ETH_ALEN) == 0 && if (!memcmp(bss->bssid, bssid, ETH_ALEN) &&
bss->channel == channel) { bss->channel == channel &&
bss->ssid_len == ssid_len &&
(ssid_len == 0 || !memcmp(bss->ssid, ssid, ssid_len))) {
atomic_inc(&bss->users); atomic_inc(&bss->users);
break; break;
} }
@ -1552,9 +1565,11 @@ static void ieee80211_rx_bss_info(struct net_device *dev,
else else
channel = rx_status->channel; channel = rx_status->channel;
bss = ieee80211_rx_bss_get(dev, mgmt->bssid, channel); bss = ieee80211_rx_bss_get(dev, mgmt->bssid, channel,
elems.ssid, elems.ssid_len);
if (!bss) { if (!bss) {
bss = ieee80211_rx_bss_add(dev, mgmt->bssid, channel); bss = ieee80211_rx_bss_add(dev, mgmt->bssid, channel,
elems.ssid, elems.ssid_len);
if (!bss) if (!bss)
return; return;
} else { } else {
@ -1580,10 +1595,6 @@ static void ieee80211_rx_bss_info(struct net_device *dev,
bss->beacon_int = le16_to_cpu(mgmt->u.beacon.beacon_int); bss->beacon_int = le16_to_cpu(mgmt->u.beacon.beacon_int);
bss->capability = le16_to_cpu(mgmt->u.beacon.capab_info); bss->capability = le16_to_cpu(mgmt->u.beacon.capab_info);
if (elems.ssid && elems.ssid_len <= IEEE80211_MAX_SSID_LEN) {
memcpy(bss->ssid, elems.ssid, elems.ssid_len);
bss->ssid_len = elems.ssid_len;
}
bss->supp_rates_len = 0; bss->supp_rates_len = 0;
if (elems.supp_rates) { if (elems.supp_rates) {
@ -2381,7 +2392,7 @@ static int ieee80211_sta_create_ibss(struct net_device *dev,
{ {
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_sta_bss *bss; struct ieee80211_sta_bss *bss;
struct ieee80211_sub_if_data *sdata; struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_hw_mode *mode; struct ieee80211_hw_mode *mode;
u8 bssid[ETH_ALEN], *pos; u8 bssid[ETH_ALEN], *pos;
int i; int i;
@ -2404,11 +2415,11 @@ static int ieee80211_sta_create_ibss(struct net_device *dev,
printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %s\n", printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %s\n",
dev->name, print_mac(mac, bssid)); dev->name, print_mac(mac, bssid));
bss = ieee80211_rx_bss_add(dev, bssid, local->hw.conf.channel); bss = ieee80211_rx_bss_add(dev, bssid, local->hw.conf.channel,
sdata->u.sta.ssid, sdata->u.sta.ssid_len);
if (!bss) if (!bss)
return -ENOMEM; return -ENOMEM;
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
mode = local->oper_hw_mode; mode = local->oper_hw_mode;
if (local->hw.conf.beacon_int == 0) if (local->hw.conf.beacon_int == 0)
@ -2474,7 +2485,8 @@ static int ieee80211_sta_find_ibss(struct net_device *dev,
"%s\n", print_mac(mac, bssid), print_mac(mac2, ifsta->bssid)); "%s\n", print_mac(mac, bssid), print_mac(mac2, ifsta->bssid));
#endif /* CONFIG_MAC80211_IBSS_DEBUG */ #endif /* CONFIG_MAC80211_IBSS_DEBUG */
if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0 && if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0 &&
(bss = ieee80211_rx_bss_get(dev, bssid, local->hw.conf.channel))) { (bss = ieee80211_rx_bss_get(dev, bssid, local->hw.conf.channel,
ifsta->ssid, ifsta->ssid_len))) {
printk(KERN_DEBUG "%s: Selected IBSS BSSID %s" printk(KERN_DEBUG "%s: Selected IBSS BSSID %s"
" based on configured SSID\n", " based on configured SSID\n",
dev->name, print_mac(mac, bssid)); dev->name, print_mac(mac, bssid));