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linux-next/drivers/net/wireless/hostap/hostap_ap.c
Adrian Bunk 54b85f489b [PATCH] hostap: Fix ap_add_sta() return value verification 
The Coverity checker (CID: 273) spotted this inconsequent NULL checking
(unconditionally dereferencing directly after checking for NULL
isn't a good idea). Return immediately to avoid this.

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Jouni Malinen <jkmaline@cc.hut.fi>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2006-03-23 16:16:57 -05:00

3293 lines
86 KiB
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/*
* Intersil Prism2 driver with Host AP (software access point) support
* Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen
* <jkmaline@cc.hut.fi>
* Copyright (c) 2002-2005, Jouni Malinen <jkmaline@cc.hut.fi>
*
* This file is to be included into hostap.c when S/W AP functionality is
* compiled.
*
* AP: FIX:
* - if unicast Class 2 (assoc,reassoc,disassoc) frame received from
* unauthenticated STA, send deauth. frame (8802.11: 5.5)
* - if unicast Class 3 (data with to/from DS,deauth,pspoll) frame received
* from authenticated, but unassoc STA, send disassoc frame (8802.11: 5.5)
* - if unicast Class 3 received from unauthenticated STA, send deauth. frame
* (8802.11: 5.5)
*/
#include <linux/proc_fs.h>
#include <linux/delay.h>
#include <linux/random.h>
#include "hostap_wlan.h"
#include "hostap.h"
#include "hostap_ap.h"
static int other_ap_policy[MAX_PARM_DEVICES] = { AP_OTHER_AP_SKIP_ALL,
DEF_INTS };
module_param_array(other_ap_policy, int, NULL, 0444);
MODULE_PARM_DESC(other_ap_policy, "Other AP beacon monitoring policy (0-3)");
static int ap_max_inactivity[MAX_PARM_DEVICES] = { AP_MAX_INACTIVITY_SEC,
DEF_INTS };
module_param_array(ap_max_inactivity, int, NULL, 0444);
MODULE_PARM_DESC(ap_max_inactivity, "AP timeout (in seconds) for station "
"inactivity");
static int ap_bridge_packets[MAX_PARM_DEVICES] = { 1, DEF_INTS };
module_param_array(ap_bridge_packets, int, NULL, 0444);
MODULE_PARM_DESC(ap_bridge_packets, "Bridge packets directly between "
"stations");
static int autom_ap_wds[MAX_PARM_DEVICES] = { 0, DEF_INTS };
module_param_array(autom_ap_wds, int, NULL, 0444);
MODULE_PARM_DESC(autom_ap_wds, "Add WDS connections to other APs "
"automatically");
static struct sta_info* ap_get_sta(struct ap_data *ap, u8 *sta);
static void hostap_event_expired_sta(struct net_device *dev,
struct sta_info *sta);
static void handle_add_proc_queue(void *data);
#ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
static void handle_wds_oper_queue(void *data);
static void prism2_send_mgmt(struct net_device *dev,
u16 type_subtype, char *body,
int body_len, u8 *addr, u16 tx_cb_idx);
#endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
#ifndef PRISM2_NO_PROCFS_DEBUG
static int ap_debug_proc_read(char *page, char **start, off_t off,
int count, int *eof, void *data)
{
char *p = page;
struct ap_data *ap = (struct ap_data *) data;
if (off != 0) {
*eof = 1;
return 0;
}
p += sprintf(p, "BridgedUnicastFrames=%u\n", ap->bridged_unicast);
p += sprintf(p, "BridgedMulticastFrames=%u\n", ap->bridged_multicast);
p += sprintf(p, "max_inactivity=%u\n", ap->max_inactivity / HZ);
p += sprintf(p, "bridge_packets=%u\n", ap->bridge_packets);
p += sprintf(p, "nullfunc_ack=%u\n", ap->nullfunc_ack);
p += sprintf(p, "autom_ap_wds=%u\n", ap->autom_ap_wds);
p += sprintf(p, "auth_algs=%u\n", ap->local->auth_algs);
p += sprintf(p, "tx_drop_nonassoc=%u\n", ap->tx_drop_nonassoc);
return (p - page);
}
#endif /* PRISM2_NO_PROCFS_DEBUG */
static void ap_sta_hash_add(struct ap_data *ap, struct sta_info *sta)
{
sta->hnext = ap->sta_hash[STA_HASH(sta->addr)];
ap->sta_hash[STA_HASH(sta->addr)] = sta;
}
static void ap_sta_hash_del(struct ap_data *ap, struct sta_info *sta)
{
struct sta_info *s;
s = ap->sta_hash[STA_HASH(sta->addr)];
if (s == NULL) return;
if (memcmp(s->addr, sta->addr, ETH_ALEN) == 0) {
ap->sta_hash[STA_HASH(sta->addr)] = s->hnext;
return;
}
while (s->hnext != NULL && memcmp(s->hnext->addr, sta->addr, ETH_ALEN)
!= 0)
s = s->hnext;
if (s->hnext != NULL)
s->hnext = s->hnext->hnext;
else
printk("AP: could not remove STA " MACSTR " from hash table\n",
MAC2STR(sta->addr));
}
static void ap_free_sta(struct ap_data *ap, struct sta_info *sta)
{
if (sta->ap && sta->local)
hostap_event_expired_sta(sta->local->dev, sta);
if (ap->proc != NULL) {
char name[20];
sprintf(name, MACSTR, MAC2STR(sta->addr));
remove_proc_entry(name, ap->proc);
}
if (sta->crypt) {
sta->crypt->ops->deinit(sta->crypt->priv);
kfree(sta->crypt);
sta->crypt = NULL;
}
skb_queue_purge(&sta->tx_buf);
ap->num_sta--;
#ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
if (sta->aid > 0)
ap->sta_aid[sta->aid - 1] = NULL;
if (!sta->ap && sta->u.sta.challenge)
kfree(sta->u.sta.challenge);
del_timer(&sta->timer);
#endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
kfree(sta);
}
static void hostap_set_tim(local_info_t *local, int aid, int set)
{
if (local->func->set_tim)
local->func->set_tim(local->dev, aid, set);
}
static void hostap_event_new_sta(struct net_device *dev, struct sta_info *sta)
{
union iwreq_data wrqu;
memset(&wrqu, 0, sizeof(wrqu));
memcpy(wrqu.addr.sa_data, sta->addr, ETH_ALEN);
wrqu.addr.sa_family = ARPHRD_ETHER;
wireless_send_event(dev, IWEVREGISTERED, &wrqu, NULL);
}
static void hostap_event_expired_sta(struct net_device *dev,
struct sta_info *sta)
{
union iwreq_data wrqu;
memset(&wrqu, 0, sizeof(wrqu));
memcpy(wrqu.addr.sa_data, sta->addr, ETH_ALEN);
wrqu.addr.sa_family = ARPHRD_ETHER;
wireless_send_event(dev, IWEVEXPIRED, &wrqu, NULL);
}
#ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
static void ap_handle_timer(unsigned long data)
{
struct sta_info *sta = (struct sta_info *) data;
local_info_t *local;
struct ap_data *ap;
unsigned long next_time = 0;
int was_assoc;
if (sta == NULL || sta->local == NULL || sta->local->ap == NULL) {
PDEBUG(DEBUG_AP, "ap_handle_timer() called with NULL data\n");
return;
}
local = sta->local;
ap = local->ap;
was_assoc = sta->flags & WLAN_STA_ASSOC;
if (atomic_read(&sta->users) != 0)
next_time = jiffies + HZ;
else if ((sta->flags & WLAN_STA_PERM) && !(sta->flags & WLAN_STA_AUTH))
next_time = jiffies + ap->max_inactivity;
if (time_before(jiffies, sta->last_rx + ap->max_inactivity)) {
/* station activity detected; reset timeout state */
sta->timeout_next = STA_NULLFUNC;
next_time = sta->last_rx + ap->max_inactivity;
} else if (sta->timeout_next == STA_DISASSOC &&
!(sta->flags & WLAN_STA_PENDING_POLL)) {
/* STA ACKed data nullfunc frame poll */
sta->timeout_next = STA_NULLFUNC;
next_time = jiffies + ap->max_inactivity;
}
if (next_time) {
sta->timer.expires = next_time;
add_timer(&sta->timer);
return;
}
if (sta->ap)
sta->timeout_next = STA_DEAUTH;
if (sta->timeout_next == STA_DEAUTH && !(sta->flags & WLAN_STA_PERM)) {
spin_lock(&ap->sta_table_lock);
ap_sta_hash_del(ap, sta);
list_del(&sta->list);
spin_unlock(&ap->sta_table_lock);
sta->flags &= ~(WLAN_STA_AUTH | WLAN_STA_ASSOC);
} else if (sta->timeout_next == STA_DISASSOC)
sta->flags &= ~WLAN_STA_ASSOC;
if (was_assoc && !(sta->flags & WLAN_STA_ASSOC) && !sta->ap)
hostap_event_expired_sta(local->dev, sta);
if (sta->timeout_next == STA_DEAUTH && sta->aid > 0 &&
!skb_queue_empty(&sta->tx_buf)) {
hostap_set_tim(local, sta->aid, 0);
sta->flags &= ~WLAN_STA_TIM;
}
if (sta->ap) {
if (ap->autom_ap_wds) {
PDEBUG(DEBUG_AP, "%s: removing automatic WDS "
"connection to AP " MACSTR "\n",
local->dev->name, MAC2STR(sta->addr));
hostap_wds_link_oper(local, sta->addr, WDS_DEL);
}
} else if (sta->timeout_next == STA_NULLFUNC) {
/* send data frame to poll STA and check whether this frame
* is ACKed */
/* FIX: IEEE80211_STYPE_NULLFUNC would be more appropriate, but
* it is apparently not retried so TX Exc events are not
* received for it */
sta->flags |= WLAN_STA_PENDING_POLL;
prism2_send_mgmt(local->dev, IEEE80211_FTYPE_DATA |
IEEE80211_STYPE_DATA, NULL, 0,
sta->addr, ap->tx_callback_poll);
} else {
int deauth = sta->timeout_next == STA_DEAUTH;
u16 resp;
PDEBUG(DEBUG_AP, "%s: sending %s info to STA " MACSTR
"(last=%lu, jiffies=%lu)\n",
local->dev->name,
deauth ? "deauthentication" : "disassociation",
MAC2STR(sta->addr), sta->last_rx, jiffies);
resp = cpu_to_le16(deauth ? WLAN_REASON_PREV_AUTH_NOT_VALID :
WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
prism2_send_mgmt(local->dev, IEEE80211_FTYPE_MGMT |
(deauth ? IEEE80211_STYPE_DEAUTH :
IEEE80211_STYPE_DISASSOC),
(char *) &resp, 2, sta->addr, 0);
}
if (sta->timeout_next == STA_DEAUTH) {
if (sta->flags & WLAN_STA_PERM) {
PDEBUG(DEBUG_AP, "%s: STA " MACSTR " would have been "
"removed, but it has 'perm' flag\n",
local->dev->name, MAC2STR(sta->addr));
} else
ap_free_sta(ap, sta);
return;
}
if (sta->timeout_next == STA_NULLFUNC) {
sta->timeout_next = STA_DISASSOC;
sta->timer.expires = jiffies + AP_DISASSOC_DELAY;
} else {
sta->timeout_next = STA_DEAUTH;
sta->timer.expires = jiffies + AP_DEAUTH_DELAY;
}
add_timer(&sta->timer);
}
void hostap_deauth_all_stas(struct net_device *dev, struct ap_data *ap,
int resend)
{
u8 addr[ETH_ALEN];
u16 resp;
int i;
PDEBUG(DEBUG_AP, "%s: Deauthenticate all stations\n", dev->name);
memset(addr, 0xff, ETH_ALEN);
resp = __constant_cpu_to_le16(WLAN_REASON_PREV_AUTH_NOT_VALID);
/* deauth message sent; try to resend it few times; the message is
* broadcast, so it may be delayed until next DTIM; there is not much
* else we can do at this point since the driver is going to be shut
* down */
for (i = 0; i < 5; i++) {
prism2_send_mgmt(dev, IEEE80211_FTYPE_MGMT |
IEEE80211_STYPE_DEAUTH,
(char *) &resp, 2, addr, 0);
if (!resend || ap->num_sta <= 0)
return;
mdelay(50);
}
}
static int ap_control_proc_read(char *page, char **start, off_t off,
int count, int *eof, void *data)
{
char *p = page;
struct ap_data *ap = (struct ap_data *) data;
char *policy_txt;
struct list_head *ptr;
struct mac_entry *entry;
if (off != 0) {
*eof = 1;
return 0;
}
switch (ap->mac_restrictions.policy) {
case MAC_POLICY_OPEN:
policy_txt = "open";
break;
case MAC_POLICY_ALLOW:
policy_txt = "allow";
break;
case MAC_POLICY_DENY:
policy_txt = "deny";
break;
default:
policy_txt = "unknown";
break;
};
p += sprintf(p, "MAC policy: %s\n", policy_txt);
p += sprintf(p, "MAC entries: %u\n", ap->mac_restrictions.entries);
p += sprintf(p, "MAC list:\n");
spin_lock_bh(&ap->mac_restrictions.lock);
for (ptr = ap->mac_restrictions.mac_list.next;
ptr != &ap->mac_restrictions.mac_list; ptr = ptr->next) {
if (p - page > PAGE_SIZE - 80) {
p += sprintf(p, "All entries did not fit one page.\n");
break;
}
entry = list_entry(ptr, struct mac_entry, list);
p += sprintf(p, MACSTR "\n", MAC2STR(entry->addr));
}
spin_unlock_bh(&ap->mac_restrictions.lock);
return (p - page);
}
int ap_control_add_mac(struct mac_restrictions *mac_restrictions, u8 *mac)
{
struct mac_entry *entry;
entry = kmalloc(sizeof(struct mac_entry), GFP_KERNEL);
if (entry == NULL)
return -1;
memcpy(entry->addr, mac, ETH_ALEN);
spin_lock_bh(&mac_restrictions->lock);
list_add_tail(&entry->list, &mac_restrictions->mac_list);
mac_restrictions->entries++;
spin_unlock_bh(&mac_restrictions->lock);
return 0;
}
int ap_control_del_mac(struct mac_restrictions *mac_restrictions, u8 *mac)
{
struct list_head *ptr;
struct mac_entry *entry;
spin_lock_bh(&mac_restrictions->lock);
for (ptr = mac_restrictions->mac_list.next;
ptr != &mac_restrictions->mac_list; ptr = ptr->next) {
entry = list_entry(ptr, struct mac_entry, list);
if (memcmp(entry->addr, mac, ETH_ALEN) == 0) {
list_del(ptr);
kfree(entry);
mac_restrictions->entries--;
spin_unlock_bh(&mac_restrictions->lock);
return 0;
}
}
spin_unlock_bh(&mac_restrictions->lock);
return -1;
}
static int ap_control_mac_deny(struct mac_restrictions *mac_restrictions,
u8 *mac)
{
struct list_head *ptr;
struct mac_entry *entry;
int found = 0;
if (mac_restrictions->policy == MAC_POLICY_OPEN)
return 0;
spin_lock_bh(&mac_restrictions->lock);
for (ptr = mac_restrictions->mac_list.next;
ptr != &mac_restrictions->mac_list; ptr = ptr->next) {
entry = list_entry(ptr, struct mac_entry, list);
if (memcmp(entry->addr, mac, ETH_ALEN) == 0) {
found = 1;
break;
}
}
spin_unlock_bh(&mac_restrictions->lock);
if (mac_restrictions->policy == MAC_POLICY_ALLOW)
return !found;
else
return found;
}
void ap_control_flush_macs(struct mac_restrictions *mac_restrictions)
{
struct list_head *ptr, *n;
struct mac_entry *entry;
if (mac_restrictions->entries == 0)
return;
spin_lock_bh(&mac_restrictions->lock);
for (ptr = mac_restrictions->mac_list.next, n = ptr->next;
ptr != &mac_restrictions->mac_list;
ptr = n, n = ptr->next) {
entry = list_entry(ptr, struct mac_entry, list);
list_del(ptr);
kfree(entry);
}
mac_restrictions->entries = 0;
spin_unlock_bh(&mac_restrictions->lock);
}
int ap_control_kick_mac(struct ap_data *ap, struct net_device *dev, u8 *mac)
{
struct sta_info *sta;
u16 resp;
spin_lock_bh(&ap->sta_table_lock);
sta = ap_get_sta(ap, mac);
if (sta) {
ap_sta_hash_del(ap, sta);
list_del(&sta->list);
}
spin_unlock_bh(&ap->sta_table_lock);
if (!sta)
return -EINVAL;
resp = cpu_to_le16(WLAN_REASON_PREV_AUTH_NOT_VALID);
prism2_send_mgmt(dev, IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_DEAUTH,
(char *) &resp, 2, sta->addr, 0);
if ((sta->flags & WLAN_STA_ASSOC) && !sta->ap)
hostap_event_expired_sta(dev, sta);
ap_free_sta(ap, sta);
return 0;
}
#endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
void ap_control_kickall(struct ap_data *ap)
{
struct list_head *ptr, *n;
struct sta_info *sta;
spin_lock_bh(&ap->sta_table_lock);
for (ptr = ap->sta_list.next, n = ptr->next; ptr != &ap->sta_list;
ptr = n, n = ptr->next) {
sta = list_entry(ptr, struct sta_info, list);
ap_sta_hash_del(ap, sta);
list_del(&sta->list);
if ((sta->flags & WLAN_STA_ASSOC) && !sta->ap && sta->local)
hostap_event_expired_sta(sta->local->dev, sta);
ap_free_sta(ap, sta);
}
spin_unlock_bh(&ap->sta_table_lock);
}
#ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
#define PROC_LIMIT (PAGE_SIZE - 80)
static int prism2_ap_proc_read(char *page, char **start, off_t off,
int count, int *eof, void *data)
{
char *p = page;
struct ap_data *ap = (struct ap_data *) data;
struct list_head *ptr;
int i;
if (off > PROC_LIMIT) {
*eof = 1;
return 0;
}
p += sprintf(p, "# BSSID CHAN SIGNAL NOISE RATE SSID FLAGS\n");
spin_lock_bh(&ap->sta_table_lock);
for (ptr = ap->sta_list.next; ptr != &ap->sta_list; ptr = ptr->next) {
struct sta_info *sta = (struct sta_info *) ptr;
if (!sta->ap)
continue;
p += sprintf(p, MACSTR " %d %d %d %d '", MAC2STR(sta->addr),
sta->u.ap.channel, sta->last_rx_signal,
sta->last_rx_silence, sta->last_rx_rate);
for (i = 0; i < sta->u.ap.ssid_len; i++)
p += sprintf(p, ((sta->u.ap.ssid[i] >= 32 &&
sta->u.ap.ssid[i] < 127) ?
"%c" : "<%02x>"),
sta->u.ap.ssid[i]);
p += sprintf(p, "'");
if (sta->capability & WLAN_CAPABILITY_ESS)
p += sprintf(p, " [ESS]");
if (sta->capability & WLAN_CAPABILITY_IBSS)
p += sprintf(p, " [IBSS]");
if (sta->capability & WLAN_CAPABILITY_PRIVACY)
p += sprintf(p, " [WEP]");
p += sprintf(p, "\n");
if ((p - page) > PROC_LIMIT) {
printk(KERN_DEBUG "hostap: ap proc did not fit\n");
break;
}
}
spin_unlock_bh(&ap->sta_table_lock);
if ((p - page) <= off) {
*eof = 1;
return 0;
}
*start = page + off;
return (p - page - off);
}
#endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
void hostap_check_sta_fw_version(struct ap_data *ap, int sta_fw_ver)
{
if (!ap)
return;
if (sta_fw_ver == PRISM2_FW_VER(0,8,0)) {
PDEBUG(DEBUG_AP, "Using data::nullfunc ACK workaround - "
"firmware upgrade recommended\n");
ap->nullfunc_ack = 1;
} else
ap->nullfunc_ack = 0;
if (sta_fw_ver == PRISM2_FW_VER(1,4,2)) {
printk(KERN_WARNING "%s: Warning: secondary station firmware "
"version 1.4.2 does not seem to work in Host AP mode\n",
ap->local->dev->name);
}
}
/* Called only as a tasklet (software IRQ) */
static void hostap_ap_tx_cb(struct sk_buff *skb, int ok, void *data)
{
struct ap_data *ap = data;
u16 fc;
struct ieee80211_hdr_4addr *hdr;
if (!ap->local->hostapd || !ap->local->apdev) {
dev_kfree_skb(skb);
return;
}
hdr = (struct ieee80211_hdr_4addr *) skb->data;
fc = le16_to_cpu(hdr->frame_ctl);
/* Pass the TX callback frame to the hostapd; use 802.11 header version
* 1 to indicate failure (no ACK) and 2 success (frame ACKed) */
fc &= ~IEEE80211_FCTL_VERS;
fc |= ok ? BIT(1) : BIT(0);
hdr->frame_ctl = cpu_to_le16(fc);
skb->dev = ap->local->apdev;
skb_pull(skb, hostap_80211_get_hdrlen(fc));
skb->pkt_type = PACKET_OTHERHOST;
skb->protocol = __constant_htons(ETH_P_802_2);
memset(skb->cb, 0, sizeof(skb->cb));
netif_rx(skb);
}
#ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
/* Called only as a tasklet (software IRQ) */
static void hostap_ap_tx_cb_auth(struct sk_buff *skb, int ok, void *data)
{
struct ap_data *ap = data;
struct net_device *dev = ap->local->dev;
struct ieee80211_hdr_4addr *hdr;
u16 fc, *pos, auth_alg, auth_transaction, status;
struct sta_info *sta = NULL;
char *txt = NULL;
if (ap->local->hostapd) {
dev_kfree_skb(skb);
return;
}
hdr = (struct ieee80211_hdr_4addr *) skb->data;
fc = le16_to_cpu(hdr->frame_ctl);
if (WLAN_FC_GET_TYPE(fc) != IEEE80211_FTYPE_MGMT ||
WLAN_FC_GET_STYPE(fc) != IEEE80211_STYPE_AUTH ||
skb->len < IEEE80211_MGMT_HDR_LEN + 6) {
printk(KERN_DEBUG "%s: hostap_ap_tx_cb_auth received invalid "
"frame\n", dev->name);
dev_kfree_skb(skb);
return;
}
pos = (u16 *) (skb->data + IEEE80211_MGMT_HDR_LEN);
auth_alg = le16_to_cpu(*pos++);
auth_transaction = le16_to_cpu(*pos++);
status = le16_to_cpu(*pos++);
if (!ok) {
txt = "frame was not ACKed";
goto done;
}
spin_lock(&ap->sta_table_lock);
sta = ap_get_sta(ap, hdr->addr1);
if (sta)
atomic_inc(&sta->users);
spin_unlock(&ap->sta_table_lock);
if (!sta) {
txt = "STA not found";
goto done;
}
if (status == WLAN_STATUS_SUCCESS &&
((auth_alg == WLAN_AUTH_OPEN && auth_transaction == 2) ||
(auth_alg == WLAN_AUTH_SHARED_KEY && auth_transaction == 4))) {
txt = "STA authenticated";
sta->flags |= WLAN_STA_AUTH;
sta->last_auth = jiffies;
} else if (status != WLAN_STATUS_SUCCESS)
txt = "authentication failed";
done:
if (sta)
atomic_dec(&sta->users);
if (txt) {
PDEBUG(DEBUG_AP, "%s: " MACSTR " auth_cb - alg=%d trans#=%d "
"status=%d - %s\n",
dev->name, MAC2STR(hdr->addr1), auth_alg,
auth_transaction, status, txt);
}
dev_kfree_skb(skb);
}
/* Called only as a tasklet (software IRQ) */
static void hostap_ap_tx_cb_assoc(struct sk_buff *skb, int ok, void *data)
{
struct ap_data *ap = data;
struct net_device *dev = ap->local->dev;
struct ieee80211_hdr_4addr *hdr;
u16 fc, *pos, status;
struct sta_info *sta = NULL;
char *txt = NULL;
if (ap->local->hostapd) {
dev_kfree_skb(skb);
return;
}
hdr = (struct ieee80211_hdr_4addr *) skb->data;
fc = le16_to_cpu(hdr->frame_ctl);
if (WLAN_FC_GET_TYPE(fc) != IEEE80211_FTYPE_MGMT ||
(WLAN_FC_GET_STYPE(fc) != IEEE80211_STYPE_ASSOC_RESP &&
WLAN_FC_GET_STYPE(fc) != IEEE80211_STYPE_REASSOC_RESP) ||
skb->len < IEEE80211_MGMT_HDR_LEN + 4) {
printk(KERN_DEBUG "%s: hostap_ap_tx_cb_assoc received invalid "
"frame\n", dev->name);
dev_kfree_skb(skb);
return;
}
if (!ok) {
txt = "frame was not ACKed";
goto done;
}
spin_lock(&ap->sta_table_lock);
sta = ap_get_sta(ap, hdr->addr1);
if (sta)
atomic_inc(&sta->users);
spin_unlock(&ap->sta_table_lock);
if (!sta) {
txt = "STA not found";
goto done;
}
pos = (u16 *) (skb->data + IEEE80211_MGMT_HDR_LEN);
pos++;
status = le16_to_cpu(*pos++);
if (status == WLAN_STATUS_SUCCESS) {
if (!(sta->flags & WLAN_STA_ASSOC))
hostap_event_new_sta(dev, sta);
txt = "STA associated";
sta->flags |= WLAN_STA_ASSOC;
sta->last_assoc = jiffies;
} else
txt = "association failed";
done:
if (sta)
atomic_dec(&sta->users);
if (txt) {
PDEBUG(DEBUG_AP, "%s: " MACSTR " assoc_cb - %s\n",
dev->name, MAC2STR(hdr->addr1), txt);
}
dev_kfree_skb(skb);
}
/* Called only as a tasklet (software IRQ); TX callback for poll frames used
* in verifying whether the STA is still present. */
static void hostap_ap_tx_cb_poll(struct sk_buff *skb, int ok, void *data)
{
struct ap_data *ap = data;
struct ieee80211_hdr_4addr *hdr;
struct sta_info *sta;
if (skb->len < 24)
goto fail;
hdr = (struct ieee80211_hdr_4addr *) skb->data;
if (ok) {
spin_lock(&ap->sta_table_lock);
sta = ap_get_sta(ap, hdr->addr1);
if (sta)
sta->flags &= ~WLAN_STA_PENDING_POLL;
spin_unlock(&ap->sta_table_lock);
} else {
PDEBUG(DEBUG_AP, "%s: STA " MACSTR " did not ACK activity "
"poll frame\n", ap->local->dev->name,
MAC2STR(hdr->addr1));
}
fail:
dev_kfree_skb(skb);
}
#endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
void hostap_init_data(local_info_t *local)
{
struct ap_data *ap = local->ap;
if (ap == NULL) {
printk(KERN_WARNING "hostap_init_data: ap == NULL\n");
return;
}
memset(ap, 0, sizeof(struct ap_data));
ap->local = local;
ap->ap_policy = GET_INT_PARM(other_ap_policy, local->card_idx);
ap->bridge_packets = GET_INT_PARM(ap_bridge_packets, local->card_idx);
ap->max_inactivity =
GET_INT_PARM(ap_max_inactivity, local->card_idx) * HZ;
ap->autom_ap_wds = GET_INT_PARM(autom_ap_wds, local->card_idx);
spin_lock_init(&ap->sta_table_lock);
INIT_LIST_HEAD(&ap->sta_list);
/* Initialize task queue structure for AP management */
INIT_WORK(&local->ap->add_sta_proc_queue, handle_add_proc_queue, ap);
ap->tx_callback_idx =
hostap_tx_callback_register(local, hostap_ap_tx_cb, ap);
if (ap->tx_callback_idx == 0)
printk(KERN_WARNING "%s: failed to register TX callback for "
"AP\n", local->dev->name);
#ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
INIT_WORK(&local->ap->wds_oper_queue, handle_wds_oper_queue, local);
ap->tx_callback_auth =
hostap_tx_callback_register(local, hostap_ap_tx_cb_auth, ap);
ap->tx_callback_assoc =
hostap_tx_callback_register(local, hostap_ap_tx_cb_assoc, ap);
ap->tx_callback_poll =
hostap_tx_callback_register(local, hostap_ap_tx_cb_poll, ap);
if (ap->tx_callback_auth == 0 || ap->tx_callback_assoc == 0 ||
ap->tx_callback_poll == 0)
printk(KERN_WARNING "%s: failed to register TX callback for "
"AP\n", local->dev->name);
spin_lock_init(&ap->mac_restrictions.lock);
INIT_LIST_HEAD(&ap->mac_restrictions.mac_list);
#endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
ap->initialized = 1;
}
void hostap_init_ap_proc(local_info_t *local)
{
struct ap_data *ap = local->ap;
ap->proc = local->proc;
if (ap->proc == NULL)
return;
#ifndef PRISM2_NO_PROCFS_DEBUG
create_proc_read_entry("ap_debug", 0, ap->proc,
ap_debug_proc_read, ap);
#endif /* PRISM2_NO_PROCFS_DEBUG */
#ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
create_proc_read_entry("ap_control", 0, ap->proc,
ap_control_proc_read, ap);
create_proc_read_entry("ap", 0, ap->proc,
prism2_ap_proc_read, ap);
#endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
}
void hostap_free_data(struct ap_data *ap)
{
struct list_head *n, *ptr;
if (ap == NULL || !ap->initialized) {
printk(KERN_DEBUG "hostap_free_data: ap has not yet been "
"initialized - skip resource freeing\n");
return;
}
#ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
if (ap->crypt)
ap->crypt->deinit(ap->crypt_priv);
ap->crypt = ap->crypt_priv = NULL;
#endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
list_for_each_safe(ptr, n, &ap->sta_list) {
struct sta_info *sta = list_entry(ptr, struct sta_info, list);
ap_sta_hash_del(ap, sta);
list_del(&sta->list);
if ((sta->flags & WLAN_STA_ASSOC) && !sta->ap && sta->local)
hostap_event_expired_sta(sta->local->dev, sta);
ap_free_sta(ap, sta);
}
#ifndef PRISM2_NO_PROCFS_DEBUG
if (ap->proc != NULL) {
remove_proc_entry("ap_debug", ap->proc);
}
#endif /* PRISM2_NO_PROCFS_DEBUG */
#ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
if (ap->proc != NULL) {
remove_proc_entry("ap", ap->proc);
remove_proc_entry("ap_control", ap->proc);
}
ap_control_flush_macs(&ap->mac_restrictions);
#endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
ap->initialized = 0;
}
/* caller should have mutex for AP STA list handling */
static struct sta_info* ap_get_sta(struct ap_data *ap, u8 *sta)
{
struct sta_info *s;
s = ap->sta_hash[STA_HASH(sta)];
while (s != NULL && memcmp(s->addr, sta, ETH_ALEN) != 0)
s = s->hnext;
return s;
}
#ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
/* Called from timer handler and from scheduled AP queue handlers */
static void prism2_send_mgmt(struct net_device *dev,
u16 type_subtype, char *body,
int body_len, u8 *addr, u16 tx_cb_idx)
{
struct hostap_interface *iface;
local_info_t *local;
struct ieee80211_hdr_4addr *hdr;
u16 fc;
struct sk_buff *skb;
struct hostap_skb_tx_data *meta;
int hdrlen;
iface = netdev_priv(dev);
local = iface->local;
dev = local->dev; /* always use master radio device */
iface = netdev_priv(dev);
if (!(dev->flags & IFF_UP)) {
PDEBUG(DEBUG_AP, "%s: prism2_send_mgmt - device is not UP - "
"cannot send frame\n", dev->name);
return;
}
skb = dev_alloc_skb(sizeof(*hdr) + body_len);
if (skb == NULL) {
PDEBUG(DEBUG_AP, "%s: prism2_send_mgmt failed to allocate "
"skb\n", dev->name);
return;
}
fc = type_subtype;
hdrlen = hostap_80211_get_hdrlen(fc);
hdr = (struct ieee80211_hdr_4addr *) skb_put(skb, hdrlen);
if (body)
memcpy(skb_put(skb, body_len), body, body_len);
memset(hdr, 0, hdrlen);
/* FIX: ctrl::ack sending used special HFA384X_TX_CTRL_802_11
* tx_control instead of using local->tx_control */
memcpy(hdr->addr1, addr, ETH_ALEN); /* DA / RA */
if (WLAN_FC_GET_TYPE(fc) == IEEE80211_FTYPE_DATA) {
fc |= IEEE80211_FCTL_FROMDS;
memcpy(hdr->addr2, dev->dev_addr, ETH_ALEN); /* BSSID */
memcpy(hdr->addr3, dev->dev_addr, ETH_ALEN); /* SA */
} else if (WLAN_FC_GET_TYPE(fc) == IEEE80211_FTYPE_CTL) {
/* control:ACK does not have addr2 or addr3 */
memset(hdr->addr2, 0, ETH_ALEN);
memset(hdr->addr3, 0, ETH_ALEN);
} else {
memcpy(hdr->addr2, dev->dev_addr, ETH_ALEN); /* SA */
memcpy(hdr->addr3, dev->dev_addr, ETH_ALEN); /* BSSID */
}
hdr->frame_ctl = cpu_to_le16(fc);
meta = (struct hostap_skb_tx_data *) skb->cb;
memset(meta, 0, sizeof(*meta));
meta->magic = HOSTAP_SKB_TX_DATA_MAGIC;
meta->iface = iface;
meta->tx_cb_idx = tx_cb_idx;
skb->dev = dev;
skb->mac.raw = skb->nh.raw = skb->data;
dev_queue_xmit(skb);
}
#endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
static int prism2_sta_proc_read(char *page, char **start, off_t off,
int count, int *eof, void *data)
{
char *p = page;
struct sta_info *sta = (struct sta_info *) data;
int i;
/* FIX: possible race condition.. the STA data could have just expired,
* but proc entry was still here so that the read could have started;
* some locking should be done here.. */
if (off != 0) {
*eof = 1;
return 0;
}
p += sprintf(p, "%s=" MACSTR "\nusers=%d\naid=%d\n"
"flags=0x%04x%s%s%s%s%s%s%s\n"
"capability=0x%02x\nlisten_interval=%d\nsupported_rates=",
sta->ap ? "AP" : "STA",
MAC2STR(sta->addr), atomic_read(&sta->users), sta->aid,
sta->flags,
sta->flags & WLAN_STA_AUTH ? " AUTH" : "",
sta->flags & WLAN_STA_ASSOC ? " ASSOC" : "",
sta->flags & WLAN_STA_PS ? " PS" : "",
sta->flags & WLAN_STA_TIM ? " TIM" : "",
sta->flags & WLAN_STA_PERM ? " PERM" : "",
sta->flags & WLAN_STA_AUTHORIZED ? " AUTHORIZED" : "",
sta->flags & WLAN_STA_PENDING_POLL ? " POLL" : "",
sta->capability, sta->listen_interval);
/* supported_rates: 500 kbit/s units with msb ignored */
for (i = 0; i < sizeof(sta->supported_rates); i++)
if (sta->supported_rates[i] != 0)
p += sprintf(p, "%d%sMbps ",
(sta->supported_rates[i] & 0x7f) / 2,
sta->supported_rates[i] & 1 ? ".5" : "");
p += sprintf(p, "\njiffies=%lu\nlast_auth=%lu\nlast_assoc=%lu\n"
"last_rx=%lu\nlast_tx=%lu\nrx_packets=%lu\n"
"tx_packets=%lu\n"
"rx_bytes=%lu\ntx_bytes=%lu\nbuffer_count=%d\n"
"last_rx: silence=%d dBm signal=%d dBm rate=%d%s Mbps\n"
"tx_rate=%d\ntx[1M]=%d\ntx[2M]=%d\ntx[5.5M]=%d\n"
"tx[11M]=%d\n"
"rx[1M]=%d\nrx[2M]=%d\nrx[5.5M]=%d\nrx[11M]=%d\n",
jiffies, sta->last_auth, sta->last_assoc, sta->last_rx,
sta->last_tx,
sta->rx_packets, sta->tx_packets, sta->rx_bytes,
sta->tx_bytes, skb_queue_len(&sta->tx_buf),
sta->last_rx_silence,
sta->last_rx_signal, sta->last_rx_rate / 10,
sta->last_rx_rate % 10 ? ".5" : "",
sta->tx_rate, sta->tx_count[0], sta->tx_count[1],
sta->tx_count[2], sta->tx_count[3], sta->rx_count[0],
sta->rx_count[1], sta->rx_count[2], sta->rx_count[3]);
if (sta->crypt && sta->crypt->ops && sta->crypt->ops->print_stats)
p = sta->crypt->ops->print_stats(p, sta->crypt->priv);
#ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
if (sta->ap) {
if (sta->u.ap.channel >= 0)
p += sprintf(p, "channel=%d\n", sta->u.ap.channel);
p += sprintf(p, "ssid=");
for (i = 0; i < sta->u.ap.ssid_len; i++)
p += sprintf(p, ((sta->u.ap.ssid[i] >= 32 &&
sta->u.ap.ssid[i] < 127) ?
"%c" : "<%02x>"),
sta->u.ap.ssid[i]);
p += sprintf(p, "\n");
}
#endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
return (p - page);
}
static void handle_add_proc_queue(void *data)
{
struct ap_data *ap = (struct ap_data *) data;
struct sta_info *sta;
char name[20];
struct add_sta_proc_data *entry, *prev;
entry = ap->add_sta_proc_entries;
ap->add_sta_proc_entries = NULL;
while (entry) {
spin_lock_bh(&ap->sta_table_lock);
sta = ap_get_sta(ap, entry->addr);
if (sta)
atomic_inc(&sta->users);
spin_unlock_bh(&ap->sta_table_lock);
if (sta) {
sprintf(name, MACSTR, MAC2STR(sta->addr));
sta->proc = create_proc_read_entry(
name, 0, ap->proc,
prism2_sta_proc_read, sta);
atomic_dec(&sta->users);
}
prev = entry;
entry = entry->next;
kfree(prev);
}
}
static struct sta_info * ap_add_sta(struct ap_data *ap, u8 *addr)
{
struct sta_info *sta;
sta = (struct sta_info *)
kmalloc(sizeof(struct sta_info), GFP_ATOMIC);
if (sta == NULL) {
PDEBUG(DEBUG_AP, "AP: kmalloc failed\n");
return NULL;
}
/* initialize STA info data */
memset(sta, 0, sizeof(struct sta_info));
sta->local = ap->local;
skb_queue_head_init(&sta->tx_buf);
memcpy(sta->addr, addr, ETH_ALEN);
atomic_inc(&sta->users);
spin_lock_bh(&ap->sta_table_lock);
list_add(&sta->list, &ap->sta_list);
ap->num_sta++;
ap_sta_hash_add(ap, sta);
spin_unlock_bh(&ap->sta_table_lock);
if (ap->proc) {
struct add_sta_proc_data *entry;
/* schedule a non-interrupt context process to add a procfs
* entry for the STA since procfs code use GFP_KERNEL */
entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
if (entry) {
memcpy(entry->addr, sta->addr, ETH_ALEN);
entry->next = ap->add_sta_proc_entries;
ap->add_sta_proc_entries = entry;
schedule_work(&ap->add_sta_proc_queue);
} else
printk(KERN_DEBUG "Failed to add STA proc data\n");
}
#ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
init_timer(&sta->timer);
sta->timer.expires = jiffies + ap->max_inactivity;
sta->timer.data = (unsigned long) sta;
sta->timer.function = ap_handle_timer;
if (!ap->local->hostapd)
add_timer(&sta->timer);
#endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
return sta;
}
static int ap_tx_rate_ok(int rateidx, struct sta_info *sta,
local_info_t *local)
{
if (rateidx > sta->tx_max_rate ||
!(sta->tx_supp_rates & (1 << rateidx)))
return 0;
if (local->tx_rate_control != 0 &&
!(local->tx_rate_control & (1 << rateidx)))
return 0;
return 1;
}
static void prism2_check_tx_rates(struct sta_info *sta)
{
int i;
sta->tx_supp_rates = 0;
for (i = 0; i < sizeof(sta->supported_rates); i++) {
if ((sta->supported_rates[i] & 0x7f) == 2)
sta->tx_supp_rates |= WLAN_RATE_1M;
if ((sta->supported_rates[i] & 0x7f) == 4)
sta->tx_supp_rates |= WLAN_RATE_2M;
if ((sta->supported_rates[i] & 0x7f) == 11)
sta->tx_supp_rates |= WLAN_RATE_5M5;
if ((sta->supported_rates[i] & 0x7f) == 22)
sta->tx_supp_rates |= WLAN_RATE_11M;
}
sta->tx_max_rate = sta->tx_rate = sta->tx_rate_idx = 0;
if (sta->tx_supp_rates & WLAN_RATE_1M) {
sta->tx_max_rate = 0;
if (ap_tx_rate_ok(0, sta, sta->local)) {
sta->tx_rate = 10;
sta->tx_rate_idx = 0;
}
}
if (sta->tx_supp_rates & WLAN_RATE_2M) {
sta->tx_max_rate = 1;
if (ap_tx_rate_ok(1, sta, sta->local)) {
sta->tx_rate = 20;
sta->tx_rate_idx = 1;
}
}
if (sta->tx_supp_rates & WLAN_RATE_5M5) {
sta->tx_max_rate = 2;
if (ap_tx_rate_ok(2, sta, sta->local)) {
sta->tx_rate = 55;
sta->tx_rate_idx = 2;
}
}
if (sta->tx_supp_rates & WLAN_RATE_11M) {
sta->tx_max_rate = 3;
if (ap_tx_rate_ok(3, sta, sta->local)) {
sta->tx_rate = 110;
sta->tx_rate_idx = 3;
}
}
}
#ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
static void ap_crypt_init(struct ap_data *ap)
{
ap->crypt = ieee80211_get_crypto_ops("WEP");
if (ap->crypt) {
if (ap->crypt->init) {
ap->crypt_priv = ap->crypt->init(0);
if (ap->crypt_priv == NULL)
ap->crypt = NULL;
else {
u8 key[WEP_KEY_LEN];
get_random_bytes(key, WEP_KEY_LEN);
ap->crypt->set_key(key, WEP_KEY_LEN, NULL,
ap->crypt_priv);
}
}
}
if (ap->crypt == NULL) {
printk(KERN_WARNING "AP could not initialize WEP: load module "
"ieee80211_crypt_wep.ko\n");
}
}
/* Generate challenge data for shared key authentication. IEEE 802.11 specifies
* that WEP algorithm is used for generating challange. This should be unique,
* but otherwise there is not really need for randomness etc. Initialize WEP
* with pseudo random key and then use increasing IV to get unique challenge
* streams.
*
* Called only as a scheduled task for pending AP frames.
*/
static char * ap_auth_make_challenge(struct ap_data *ap)
{
char *tmpbuf;
struct sk_buff *skb;
if (ap->crypt == NULL) {
ap_crypt_init(ap);
if (ap->crypt == NULL)
return NULL;
}
tmpbuf = (char *) kmalloc(WLAN_AUTH_CHALLENGE_LEN, GFP_ATOMIC);
if (tmpbuf == NULL) {
PDEBUG(DEBUG_AP, "AP: kmalloc failed for challenge\n");
return NULL;
}
skb = dev_alloc_skb(WLAN_AUTH_CHALLENGE_LEN +
ap->crypt->extra_mpdu_prefix_len +
ap->crypt->extra_mpdu_postfix_len);
if (skb == NULL) {
kfree(tmpbuf);
return NULL;
}
skb_reserve(skb, ap->crypt->extra_mpdu_prefix_len);
memset(skb_put(skb, WLAN_AUTH_CHALLENGE_LEN), 0,
WLAN_AUTH_CHALLENGE_LEN);
if (ap->crypt->encrypt_mpdu(skb, 0, ap->crypt_priv)) {
dev_kfree_skb(skb);
kfree(tmpbuf);
return NULL;
}
memcpy(tmpbuf, skb->data + ap->crypt->extra_mpdu_prefix_len,
WLAN_AUTH_CHALLENGE_LEN);
dev_kfree_skb(skb);
return tmpbuf;
}
/* Called only as a scheduled task for pending AP frames. */
static void handle_authen(local_info_t *local, struct sk_buff *skb,
struct hostap_80211_rx_status *rx_stats)
{
struct net_device *dev = local->dev;
struct ieee80211_hdr_4addr *hdr = (struct ieee80211_hdr_4addr *) skb->data;
size_t hdrlen;
struct ap_data *ap = local->ap;
char body[8 + WLAN_AUTH_CHALLENGE_LEN], *challenge = NULL;
int len, olen;
u16 auth_alg, auth_transaction, status_code, *pos;
u16 resp = WLAN_STATUS_SUCCESS, fc;
struct sta_info *sta = NULL;
struct ieee80211_crypt_data *crypt;
char *txt = "";
len = skb->len - IEEE80211_MGMT_HDR_LEN;
fc = le16_to_cpu(hdr->frame_ctl);
hdrlen = hostap_80211_get_hdrlen(fc);
if (len < 6) {
PDEBUG(DEBUG_AP, "%s: handle_authen - too short payload "
"(len=%d) from " MACSTR "\n", dev->name, len,
MAC2STR(hdr->addr2));
return;
}
spin_lock_bh(&local->ap->sta_table_lock);
sta = ap_get_sta(local->ap, hdr->addr2);
if (sta)
atomic_inc(&sta->users);
spin_unlock_bh(&local->ap->sta_table_lock);
if (sta && sta->crypt)
crypt = sta->crypt;
else {
int idx = 0;
if (skb->len >= hdrlen + 3)
idx = skb->data[hdrlen + 3] >> 6;
crypt = local->crypt[idx];
}
pos = (u16 *) (skb->data + IEEE80211_MGMT_HDR_LEN);
auth_alg = __le16_to_cpu(*pos);
pos++;
auth_transaction = __le16_to_cpu(*pos);
pos++;
status_code = __le16_to_cpu(*pos);
pos++;
if (memcmp(dev->dev_addr, hdr->addr2, ETH_ALEN) == 0 ||
ap_control_mac_deny(&ap->mac_restrictions, hdr->addr2)) {
txt = "authentication denied";
resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
goto fail;
}
if (((local->auth_algs & PRISM2_AUTH_OPEN) &&
auth_alg == WLAN_AUTH_OPEN) ||
((local->auth_algs & PRISM2_AUTH_SHARED_KEY) &&
crypt && auth_alg == WLAN_AUTH_SHARED_KEY)) {
} else {
txt = "unsupported algorithm";
resp = WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG;
goto fail;
}
if (len >= 8) {
u8 *u = (u8 *) pos;
if (*u == WLAN_EID_CHALLENGE) {
if (*(u + 1) != WLAN_AUTH_CHALLENGE_LEN) {
txt = "invalid challenge len";
resp = WLAN_STATUS_CHALLENGE_FAIL;
goto fail;
}
if (len - 8 < WLAN_AUTH_CHALLENGE_LEN) {
txt = "challenge underflow";
resp = WLAN_STATUS_CHALLENGE_FAIL;
goto fail;
}
challenge = (char *) (u + 2);
}
}
if (sta && sta->ap) {
if (time_after(jiffies, sta->u.ap.last_beacon +
(10 * sta->listen_interval * HZ) / 1024)) {
PDEBUG(DEBUG_AP, "%s: no beacons received for a while,"
" assuming AP " MACSTR " is now STA\n",
dev->name, MAC2STR(sta->addr));
sta->ap = 0;
sta->flags = 0;
sta->u.sta.challenge = NULL;
} else {
txt = "AP trying to authenticate?";
resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
goto fail;
}
}
if ((auth_alg == WLAN_AUTH_OPEN && auth_transaction == 1) ||
(auth_alg == WLAN_AUTH_SHARED_KEY &&
(auth_transaction == 1 ||
(auth_transaction == 3 && sta != NULL &&
sta->u.sta.challenge != NULL)))) {
} else {
txt = "unknown authentication transaction number";
resp = WLAN_STATUS_UNKNOWN_AUTH_TRANSACTION;
goto fail;
}
if (sta == NULL) {
txt = "new STA";
if (local->ap->num_sta >= MAX_STA_COUNT) {
/* FIX: might try to remove some old STAs first? */
txt = "no more room for new STAs";
resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
goto fail;
}
sta = ap_add_sta(local->ap, hdr->addr2);
if (sta == NULL) {
txt = "ap_add_sta failed";
resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
goto fail;
}
}
switch (auth_alg) {
case WLAN_AUTH_OPEN:
txt = "authOK";
/* IEEE 802.11 standard is not completely clear about
* whether STA is considered authenticated after
* authentication OK frame has been send or after it
* has been ACKed. In order to reduce interoperability
* issues, mark the STA authenticated before ACK. */
sta->flags |= WLAN_STA_AUTH;
break;
case WLAN_AUTH_SHARED_KEY:
if (auth_transaction == 1) {
if (sta->u.sta.challenge == NULL) {
sta->u.sta.challenge =
ap_auth_make_challenge(local->ap);
if (sta->u.sta.challenge == NULL) {
resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
goto fail;
}
}
} else {
if (sta->u.sta.challenge == NULL ||
challenge == NULL ||
memcmp(sta->u.sta.challenge, challenge,
WLAN_AUTH_CHALLENGE_LEN) != 0 ||
!(fc & IEEE80211_FCTL_PROTECTED)) {
txt = "challenge response incorrect";
resp = WLAN_STATUS_CHALLENGE_FAIL;
goto fail;
}
txt = "challenge OK - authOK";
/* IEEE 802.11 standard is not completely clear about
* whether STA is considered authenticated after
* authentication OK frame has been send or after it
* has been ACKed. In order to reduce interoperability
* issues, mark the STA authenticated before ACK. */
sta->flags |= WLAN_STA_AUTH;
kfree(sta->u.sta.challenge);
sta->u.sta.challenge = NULL;
}
break;
}
fail:
pos = (u16 *) body;
*pos = cpu_to_le16(auth_alg);
pos++;
*pos = cpu_to_le16(auth_transaction + 1);
pos++;
*pos = cpu_to_le16(resp); /* status_code */
pos++;
olen = 6;
if (resp == WLAN_STATUS_SUCCESS && sta != NULL &&
sta->u.sta.challenge != NULL &&
auth_alg == WLAN_AUTH_SHARED_KEY && auth_transaction == 1) {
u8 *tmp = (u8 *) pos;
*tmp++ = WLAN_EID_CHALLENGE;
*tmp++ = WLAN_AUTH_CHALLENGE_LEN;
pos++;
memcpy(pos, sta->u.sta.challenge, WLAN_AUTH_CHALLENGE_LEN);
olen += 2 + WLAN_AUTH_CHALLENGE_LEN;
}
prism2_send_mgmt(dev, IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_AUTH,
body, olen, hdr->addr2, ap->tx_callback_auth);
if (sta) {
sta->last_rx = jiffies;
atomic_dec(&sta->users);
}
if (resp) {
PDEBUG(DEBUG_AP, "%s: " MACSTR " auth (alg=%d trans#=%d "
"stat=%d len=%d fc=%04x) ==> %d (%s)\n",
dev->name, MAC2STR(hdr->addr2), auth_alg,
auth_transaction, status_code, len, fc, resp, txt);
}
}
/* Called only as a scheduled task for pending AP frames. */
static void handle_assoc(local_info_t *local, struct sk_buff *skb,
struct hostap_80211_rx_status *rx_stats, int reassoc)
{
struct net_device *dev = local->dev;
struct ieee80211_hdr_4addr *hdr = (struct ieee80211_hdr_4addr *) skb->data;
char body[12], *p, *lpos;
int len, left;
u16 *pos;
u16 resp = WLAN_STATUS_SUCCESS;
struct sta_info *sta = NULL;
int send_deauth = 0;
char *txt = "";
u8 prev_ap[ETH_ALEN];
left = len = skb->len - IEEE80211_MGMT_HDR_LEN;
if (len < (reassoc ? 10 : 4)) {
PDEBUG(DEBUG_AP, "%s: handle_assoc - too short payload "
"(len=%d, reassoc=%d) from " MACSTR "\n",
dev->name, len, reassoc, MAC2STR(hdr->addr2));
return;
}
spin_lock_bh(&local->ap->sta_table_lock);
sta = ap_get_sta(local->ap, hdr->addr2);
if (sta == NULL || (sta->flags & WLAN_STA_AUTH) == 0) {
spin_unlock_bh(&local->ap->sta_table_lock);
txt = "trying to associate before authentication";
send_deauth = 1;
resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
sta = NULL; /* do not decrement sta->users */
goto fail;
}
atomic_inc(&sta->users);
spin_unlock_bh(&local->ap->sta_table_lock);
pos = (u16 *) (skb->data + IEEE80211_MGMT_HDR_LEN);
sta->capability = __le16_to_cpu(*pos);
pos++; left -= 2;
sta->listen_interval = __le16_to_cpu(*pos);
pos++; left -= 2;
if (reassoc) {
memcpy(prev_ap, pos, ETH_ALEN);
pos++; pos++; pos++; left -= 6;
} else
memset(prev_ap, 0, ETH_ALEN);
if (left >= 2) {
unsigned int ileft;
unsigned char *u = (unsigned char *) pos;
if (*u == WLAN_EID_SSID) {
u++; left--;
ileft = *u;
u++; left--;
if (ileft > left || ileft > MAX_SSID_LEN) {
txt = "SSID overflow";
resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
goto fail;
}
if (ileft != strlen(local->essid) ||
memcmp(local->essid, u, ileft) != 0) {
txt = "not our SSID";
resp = WLAN_STATUS_ASSOC_DENIED_UNSPEC;
goto fail;
}
u += ileft;
left -= ileft;
}
if (left >= 2 && *u == WLAN_EID_SUPP_RATES) {
u++; left--;
ileft = *u;
u++; left--;
if (ileft > left || ileft == 0 ||
ileft > WLAN_SUPP_RATES_MAX) {
txt = "SUPP_RATES len error";
resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
goto fail;
}
memset(sta->supported_rates, 0,
sizeof(sta->supported_rates));
memcpy(sta->supported_rates, u, ileft);
prism2_check_tx_rates(sta);
u += ileft;
left -= ileft;
}
if (left > 0) {
PDEBUG(DEBUG_AP, "%s: assoc from " MACSTR " with extra"
" data (%d bytes) [",
dev->name, MAC2STR(hdr->addr2), left);
while (left > 0) {
PDEBUG2(DEBUG_AP, "<%02x>", *u);
u++; left--;
}
PDEBUG2(DEBUG_AP, "]\n");
}
} else {
txt = "frame underflow";
resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
goto fail;
}
/* get a unique AID */
if (sta->aid > 0)
txt = "OK, old AID";
else {
spin_lock_bh(&local->ap->sta_table_lock);
for (sta->aid = 1; sta->aid <= MAX_AID_TABLE_SIZE; sta->aid++)
if (local->ap->sta_aid[sta->aid - 1] == NULL)
break;
if (sta->aid > MAX_AID_TABLE_SIZE) {
sta->aid = 0;
spin_unlock_bh(&local->ap->sta_table_lock);
resp = WLAN_STATUS_AP_UNABLE_TO_HANDLE_NEW_STA;
txt = "no room for more AIDs";
} else {
local->ap->sta_aid[sta->aid - 1] = sta;
spin_unlock_bh(&local->ap->sta_table_lock);
txt = "OK, new AID";
}
}
fail:
pos = (u16 *) body;
if (send_deauth) {
*pos = __constant_cpu_to_le16(
WLAN_REASON_STA_REQ_ASSOC_WITHOUT_AUTH);
pos++;
} else {
/* FIX: CF-Pollable and CF-PollReq should be set to match the
* values in beacons/probe responses */
/* FIX: how about privacy and WEP? */
/* capability */
*pos = __constant_cpu_to_le16(WLAN_CAPABILITY_ESS);
pos++;
/* status_code */
*pos = __cpu_to_le16(resp);
pos++;
*pos = __cpu_to_le16((sta && sta->aid > 0 ? sta->aid : 0) |
BIT(14) | BIT(15)); /* AID */
pos++;
/* Supported rates (Information element) */
p = (char *) pos;
*p++ = WLAN_EID_SUPP_RATES;
lpos = p;
*p++ = 0; /* len */
if (local->tx_rate_control & WLAN_RATE_1M) {
*p++ = local->basic_rates & WLAN_RATE_1M ? 0x82 : 0x02;
(*lpos)++;
}
if (local->tx_rate_control & WLAN_RATE_2M) {
*p++ = local->basic_rates & WLAN_RATE_2M ? 0x84 : 0x04;
(*lpos)++;
}
if (local->tx_rate_control & WLAN_RATE_5M5) {
*p++ = local->basic_rates & WLAN_RATE_5M5 ?
0x8b : 0x0b;
(*lpos)++;
}
if (local->tx_rate_control & WLAN_RATE_11M) {
*p++ = local->basic_rates & WLAN_RATE_11M ?
0x96 : 0x16;
(*lpos)++;
}
pos = (u16 *) p;
}
prism2_send_mgmt(dev, IEEE80211_FTYPE_MGMT |
(send_deauth ? IEEE80211_STYPE_DEAUTH :
(reassoc ? IEEE80211_STYPE_REASSOC_RESP :
IEEE80211_STYPE_ASSOC_RESP)),
body, (u8 *) pos - (u8 *) body,
hdr->addr2,
send_deauth ? 0 : local->ap->tx_callback_assoc);
if (sta) {
if (resp == WLAN_STATUS_SUCCESS) {
sta->last_rx = jiffies;
/* STA will be marked associated from TX callback, if
* AssocResp is ACKed */
}
atomic_dec(&sta->users);
}
#if 0
PDEBUG(DEBUG_AP, "%s: " MACSTR " %sassoc (len=%d prev_ap=" MACSTR
") => %d(%d) (%s)\n",
dev->name, MAC2STR(hdr->addr2), reassoc ? "re" : "", len,
MAC2STR(prev_ap), resp, send_deauth, txt);
#endif
}
/* Called only as a scheduled task for pending AP frames. */
static void handle_deauth(local_info_t *local, struct sk_buff *skb,
struct hostap_80211_rx_status *rx_stats)
{
struct net_device *dev = local->dev;
struct ieee80211_hdr_4addr *hdr = (struct ieee80211_hdr_4addr *) skb->data;
char *body = (char *) (skb->data + IEEE80211_MGMT_HDR_LEN);
int len;
u16 reason_code, *pos;
struct sta_info *sta = NULL;
len = skb->len - IEEE80211_MGMT_HDR_LEN;
if (len < 2) {
printk("handle_deauth - too short payload (len=%d)\n", len);
return;
}
pos = (u16 *) body;
reason_code = __le16_to_cpu(*pos);
PDEBUG(DEBUG_AP, "%s: deauthentication: " MACSTR " len=%d, "
"reason_code=%d\n", dev->name, MAC2STR(hdr->addr2), len,
reason_code);
spin_lock_bh(&local->ap->sta_table_lock);
sta = ap_get_sta(local->ap, hdr->addr2);
if (sta != NULL) {
if ((sta->flags & WLAN_STA_ASSOC) && !sta->ap)
hostap_event_expired_sta(local->dev, sta);
sta->flags &= ~(WLAN_STA_AUTH | WLAN_STA_ASSOC);
}
spin_unlock_bh(&local->ap->sta_table_lock);
if (sta == NULL) {
printk("%s: deauthentication from " MACSTR ", "
"reason_code=%d, but STA not authenticated\n", dev->name,
MAC2STR(hdr->addr2), reason_code);
}
}
/* Called only as a scheduled task for pending AP frames. */
static void handle_disassoc(local_info_t *local, struct sk_buff *skb,
struct hostap_80211_rx_status *rx_stats)
{
struct net_device *dev = local->dev;
struct ieee80211_hdr_4addr *hdr = (struct ieee80211_hdr_4addr *) skb->data;
char *body = skb->data + IEEE80211_MGMT_HDR_LEN;
int len;
u16 reason_code, *pos;
struct sta_info *sta = NULL;
len = skb->len - IEEE80211_MGMT_HDR_LEN;
if (len < 2) {
printk("handle_disassoc - too short payload (len=%d)\n", len);
return;
}
pos = (u16 *) body;
reason_code = __le16_to_cpu(*pos);
PDEBUG(DEBUG_AP, "%s: disassociation: " MACSTR " len=%d, "
"reason_code=%d\n", dev->name, MAC2STR(hdr->addr2), len,
reason_code);
spin_lock_bh(&local->ap->sta_table_lock);
sta = ap_get_sta(local->ap, hdr->addr2);
if (sta != NULL) {
if ((sta->flags & WLAN_STA_ASSOC) && !sta->ap)
hostap_event_expired_sta(local->dev, sta);
sta->flags &= ~WLAN_STA_ASSOC;
}
spin_unlock_bh(&local->ap->sta_table_lock);
if (sta == NULL) {
printk("%s: disassociation from " MACSTR ", "
"reason_code=%d, but STA not authenticated\n",
dev->name, MAC2STR(hdr->addr2), reason_code);
}
}
/* Called only as a scheduled task for pending AP frames. */
static void ap_handle_data_nullfunc(local_info_t *local,
struct ieee80211_hdr_4addr *hdr)
{
struct net_device *dev = local->dev;
/* some STA f/w's seem to require control::ACK frame for
* data::nullfunc, but at least Prism2 station f/w version 0.8.0 does
* not send this..
* send control::ACK for the data::nullfunc */
printk(KERN_DEBUG "Sending control::ACK for data::nullfunc\n");
prism2_send_mgmt(dev, IEEE80211_FTYPE_CTL | IEEE80211_STYPE_ACK,
NULL, 0, hdr->addr2, 0);
}
/* Called only as a scheduled task for pending AP frames. */
static void ap_handle_dropped_data(local_info_t *local,
struct ieee80211_hdr_4addr *hdr)
{
struct net_device *dev = local->dev;
struct sta_info *sta;
u16 reason;
spin_lock_bh(&local->ap->sta_table_lock);
sta = ap_get_sta(local->ap, hdr->addr2);
if (sta)
atomic_inc(&sta->users);
spin_unlock_bh(&local->ap->sta_table_lock);
if (sta != NULL && (sta->flags & WLAN_STA_ASSOC)) {
PDEBUG(DEBUG_AP, "ap_handle_dropped_data: STA is now okay?\n");
atomic_dec(&sta->users);
return;
}
reason = __constant_cpu_to_le16(
WLAN_REASON_CLASS3_FRAME_FROM_NONASSOC_STA);
prism2_send_mgmt(dev, IEEE80211_FTYPE_MGMT |
((sta == NULL || !(sta->flags & WLAN_STA_ASSOC)) ?
IEEE80211_STYPE_DEAUTH : IEEE80211_STYPE_DISASSOC),
(char *) &reason, sizeof(reason), hdr->addr2, 0);
if (sta)
atomic_dec(&sta->users);
}
#endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
/* Called only as a scheduled task for pending AP frames. */
static void pspoll_send_buffered(local_info_t *local, struct sta_info *sta,
struct sk_buff *skb)
{
struct hostap_skb_tx_data *meta;
if (!(sta->flags & WLAN_STA_PS)) {
/* Station has moved to non-PS mode, so send all buffered
* frames using normal device queue. */
dev_queue_xmit(skb);
return;
}
/* add a flag for hostap_handle_sta_tx() to know that this skb should
* be passed through even though STA is using PS */
meta = (struct hostap_skb_tx_data *) skb->cb;
meta->flags |= HOSTAP_TX_FLAGS_BUFFERED_FRAME;
if (!skb_queue_empty(&sta->tx_buf)) {
/* indicate to STA that more frames follow */
meta->flags |= HOSTAP_TX_FLAGS_ADD_MOREDATA;
}
dev_queue_xmit(skb);
}
/* Called only as a scheduled task for pending AP frames. */
static void handle_pspoll(local_info_t *local,
struct ieee80211_hdr_4addr *hdr,
struct hostap_80211_rx_status *rx_stats)
{
struct net_device *dev = local->dev;
struct sta_info *sta;
u16 aid;
struct sk_buff *skb;
PDEBUG(DEBUG_PS2, "handle_pspoll: BSSID=" MACSTR ", TA=" MACSTR
" PWRMGT=%d\n",
MAC2STR(hdr->addr1), MAC2STR(hdr->addr2),
!!(le16_to_cpu(hdr->frame_ctl) & IEEE80211_FCTL_PM));
if (memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN)) {
PDEBUG(DEBUG_AP, "handle_pspoll - addr1(BSSID)=" MACSTR
" not own MAC\n", MAC2STR(hdr->addr1));
return;
}
aid = __le16_to_cpu(hdr->duration_id);
if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14))) {
PDEBUG(DEBUG_PS, " PSPOLL and AID[15:14] not set\n");
return;
}
aid &= ~BIT(15) & ~BIT(14);
if (aid == 0 || aid > MAX_AID_TABLE_SIZE) {
PDEBUG(DEBUG_PS, " invalid aid=%d\n", aid);
return;
}
PDEBUG(DEBUG_PS2, " aid=%d\n", aid);
spin_lock_bh(&local->ap->sta_table_lock);
sta = ap_get_sta(local->ap, hdr->addr2);
if (sta)
atomic_inc(&sta->users);
spin_unlock_bh(&local->ap->sta_table_lock);
if (sta == NULL) {
PDEBUG(DEBUG_PS, " STA not found\n");
return;
}
if (sta->aid != aid) {
PDEBUG(DEBUG_PS, " received aid=%i does not match with "
"assoc.aid=%d\n", aid, sta->aid);
return;
}
/* FIX: todo:
* - add timeout for buffering (clear aid in TIM vector if buffer timed
* out (expiry time must be longer than ListenInterval for
* the corresponding STA; "8802-11: 11.2.1.9 AP aging function"
* - what to do, if buffered, pspolled, and sent frame is not ACKed by
* sta; store buffer for later use and leave TIM aid bit set? use
* TX event to check whether frame was ACKed?
*/
while ((skb = skb_dequeue(&sta->tx_buf)) != NULL) {
/* send buffered frame .. */
PDEBUG(DEBUG_PS2, "Sending buffered frame to STA after PS POLL"
" (buffer_count=%d)\n", skb_queue_len(&sta->tx_buf));
pspoll_send_buffered(local, sta, skb);
if (sta->flags & WLAN_STA_PS) {
/* send only one buffered packet per PS Poll */
/* FIX: should ignore further PS Polls until the
* buffered packet that was just sent is acknowledged
* (Tx or TxExc event) */
break;
}
}
if (skb_queue_empty(&sta->tx_buf)) {
/* try to clear aid from TIM */
if (!(sta->flags & WLAN_STA_TIM))
PDEBUG(DEBUG_PS2, "Re-unsetting TIM for aid %d\n",
aid);
hostap_set_tim(local, aid, 0);
sta->flags &= ~WLAN_STA_TIM;
}
atomic_dec(&sta->users);
}
#ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
static void handle_wds_oper_queue(void *data)
{
local_info_t *local = data;
struct wds_oper_data *entry, *prev;
spin_lock_bh(&local->lock);
entry = local->ap->wds_oper_entries;
local->ap->wds_oper_entries = NULL;
spin_unlock_bh(&local->lock);
while (entry) {
PDEBUG(DEBUG_AP, "%s: %s automatic WDS connection "
"to AP " MACSTR "\n",
local->dev->name,
entry->type == WDS_ADD ? "adding" : "removing",
MAC2STR(entry->addr));
if (entry->type == WDS_ADD)
prism2_wds_add(local, entry->addr, 0);
else if (entry->type == WDS_DEL)
prism2_wds_del(local, entry->addr, 0, 1);
prev = entry;
entry = entry->next;
kfree(prev);
}
}
/* Called only as a scheduled task for pending AP frames. */
static void handle_beacon(local_info_t *local, struct sk_buff *skb,
struct hostap_80211_rx_status *rx_stats)
{
struct ieee80211_hdr_4addr *hdr = (struct ieee80211_hdr_4addr *) skb->data;
char *body = skb->data + IEEE80211_MGMT_HDR_LEN;
int len, left;
u16 *pos, beacon_int, capability;
char *ssid = NULL;
unsigned char *supp_rates = NULL;
int ssid_len = 0, supp_rates_len = 0;
struct sta_info *sta = NULL;
int new_sta = 0, channel = -1;
len = skb->len - IEEE80211_MGMT_HDR_LEN;
if (len < 8 + 2 + 2) {
printk(KERN_DEBUG "handle_beacon - too short payload "
"(len=%d)\n", len);
return;
}
pos = (u16 *) body;
left = len;
/* Timestamp (8 octets) */
pos += 4; left -= 8;
/* Beacon interval (2 octets) */
beacon_int = __le16_to_cpu(*pos);
pos++; left -= 2;
/* Capability information (2 octets) */
capability = __le16_to_cpu(*pos);
pos++; left -= 2;
if (local->ap->ap_policy != AP_OTHER_AP_EVEN_IBSS &&
capability & WLAN_CAPABILITY_IBSS)
return;
if (left >= 2) {
unsigned int ileft;
unsigned char *u = (unsigned char *) pos;
if (*u == WLAN_EID_SSID) {
u++; left--;
ileft = *u;
u++; left--;
if (ileft > left || ileft > MAX_SSID_LEN) {
PDEBUG(DEBUG_AP, "SSID: overflow\n");
return;
}
if (local->ap->ap_policy == AP_OTHER_AP_SAME_SSID &&
(ileft != strlen(local->essid) ||
memcmp(local->essid, u, ileft) != 0)) {
/* not our SSID */
return;
}
ssid = u;
ssid_len = ileft;
u += ileft;
left -= ileft;
}
if (*u == WLAN_EID_SUPP_RATES) {
u++; left--;
ileft = *u;
u++; left--;
if (ileft > left || ileft == 0 || ileft > 8) {
PDEBUG(DEBUG_AP, " - SUPP_RATES len error\n");
return;
}
supp_rates = u;
supp_rates_len = ileft;
u += ileft;
left -= ileft;
}
if (*u == WLAN_EID_DS_PARAMS) {
u++; left--;
ileft = *u;
u++; left--;
if (ileft > left || ileft != 1) {
PDEBUG(DEBUG_AP, " - DS_PARAMS len error\n");
return;
}
channel = *u;
u += ileft;
left -= ileft;
}
}
spin_lock_bh(&local->ap->sta_table_lock);
sta = ap_get_sta(local->ap, hdr->addr2);
if (sta != NULL)
atomic_inc(&sta->users);
spin_unlock_bh(&local->ap->sta_table_lock);
if (sta == NULL) {
/* add new AP */
new_sta = 1;
sta = ap_add_sta(local->ap, hdr->addr2);
if (sta == NULL) {
printk(KERN_INFO "prism2: kmalloc failed for AP "
"data structure\n");
return;
}
hostap_event_new_sta(local->dev, sta);
/* mark APs authentication and associated for pseudo ad-hoc
* style communication */
sta->flags = WLAN_STA_AUTH | WLAN_STA_ASSOC;
if (local->ap->autom_ap_wds) {
hostap_wds_link_oper(local, sta->addr, WDS_ADD);
}
}
sta->ap = 1;
if (ssid) {
sta->u.ap.ssid_len = ssid_len;
memcpy(sta->u.ap.ssid, ssid, ssid_len);
sta->u.ap.ssid[ssid_len] = '\0';
} else {
sta->u.ap.ssid_len = 0;
sta->u.ap.ssid[0] = '\0';
}
sta->u.ap.channel = channel;
sta->rx_packets++;
sta->rx_bytes += len;
sta->u.ap.last_beacon = sta->last_rx = jiffies;
sta->capability = capability;
sta->listen_interval = beacon_int;
atomic_dec(&sta->users);
if (new_sta) {
memset(sta->supported_rates, 0, sizeof(sta->supported_rates));
memcpy(sta->supported_rates, supp_rates, supp_rates_len);
prism2_check_tx_rates(sta);
}
}
#endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
/* Called only as a tasklet. */
static void handle_ap_item(local_info_t *local, struct sk_buff *skb,
struct hostap_80211_rx_status *rx_stats)
{
#ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
struct net_device *dev = local->dev;
#endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
u16 fc, type, stype;
struct ieee80211_hdr_4addr *hdr;
/* FIX: should give skb->len to handler functions and check that the
* buffer is long enough */
hdr = (struct ieee80211_hdr_4addr *) skb->data;
fc = le16_to_cpu(hdr->frame_ctl);
type = WLAN_FC_GET_TYPE(fc);
stype = WLAN_FC_GET_STYPE(fc);
#ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
if (!local->hostapd && type == IEEE80211_FTYPE_DATA) {
PDEBUG(DEBUG_AP, "handle_ap_item - data frame\n");
if (!(fc & IEEE80211_FCTL_TODS) ||
(fc & IEEE80211_FCTL_FROMDS)) {
if (stype == IEEE80211_STYPE_NULLFUNC) {
/* no ToDS nullfunc seems to be used to check
* AP association; so send reject message to
* speed up re-association */
ap_handle_dropped_data(local, hdr);
goto done;
}
PDEBUG(DEBUG_AP, " not ToDS frame (fc=0x%04x)\n",
fc);
goto done;
}
if (memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN)) {
PDEBUG(DEBUG_AP, "handle_ap_item - addr1(BSSID)="
MACSTR " not own MAC\n",
MAC2STR(hdr->addr1));
goto done;
}
if (local->ap->nullfunc_ack &&
stype == IEEE80211_STYPE_NULLFUNC)
ap_handle_data_nullfunc(local, hdr);
else
ap_handle_dropped_data(local, hdr);
goto done;
}
if (type == IEEE80211_FTYPE_MGMT && stype == IEEE80211_STYPE_BEACON) {
handle_beacon(local, skb, rx_stats);
goto done;
}
#endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
if (type == IEEE80211_FTYPE_CTL && stype == IEEE80211_STYPE_PSPOLL) {
handle_pspoll(local, hdr, rx_stats);
goto done;
}
if (local->hostapd) {
PDEBUG(DEBUG_AP, "Unknown frame in AP queue: type=0x%02x "
"subtype=0x%02x\n", type, stype);
goto done;
}
#ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
if (type != IEEE80211_FTYPE_MGMT) {
PDEBUG(DEBUG_AP, "handle_ap_item - not a management frame?\n");
goto done;
}
if (memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN)) {
PDEBUG(DEBUG_AP, "handle_ap_item - addr1(DA)=" MACSTR
" not own MAC\n", MAC2STR(hdr->addr1));
goto done;
}
if (memcmp(hdr->addr3, dev->dev_addr, ETH_ALEN)) {
PDEBUG(DEBUG_AP, "handle_ap_item - addr3(BSSID)=" MACSTR
" not own MAC\n", MAC2STR(hdr->addr3));
goto done;
}
switch (stype) {
case IEEE80211_STYPE_ASSOC_REQ:
handle_assoc(local, skb, rx_stats, 0);
break;
case IEEE80211_STYPE_ASSOC_RESP:
PDEBUG(DEBUG_AP, "==> ASSOC RESP (ignored)\n");
break;
case IEEE80211_STYPE_REASSOC_REQ:
handle_assoc(local, skb, rx_stats, 1);
break;
case IEEE80211_STYPE_REASSOC_RESP:
PDEBUG(DEBUG_AP, "==> REASSOC RESP (ignored)\n");
break;
case IEEE80211_STYPE_ATIM:
PDEBUG(DEBUG_AP, "==> ATIM (ignored)\n");
break;
case IEEE80211_STYPE_DISASSOC:
handle_disassoc(local, skb, rx_stats);
break;
case IEEE80211_STYPE_AUTH:
handle_authen(local, skb, rx_stats);
break;
case IEEE80211_STYPE_DEAUTH:
handle_deauth(local, skb, rx_stats);
break;
default:
PDEBUG(DEBUG_AP, "Unknown mgmt frame subtype 0x%02x\n",
stype >> 4);
break;
}
#endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
done:
dev_kfree_skb(skb);
}
/* Called only as a tasklet (software IRQ) */
void hostap_rx(struct net_device *dev, struct sk_buff *skb,
struct hostap_80211_rx_status *rx_stats)
{
struct hostap_interface *iface;
local_info_t *local;
u16 fc;
struct ieee80211_hdr_4addr *hdr;
iface = netdev_priv(dev);
local = iface->local;
if (skb->len < 16)
goto drop;
local->stats.rx_packets++;
hdr = (struct ieee80211_hdr_4addr *) skb->data;
fc = le16_to_cpu(hdr->frame_ctl);
if (local->ap->ap_policy == AP_OTHER_AP_SKIP_ALL &&
WLAN_FC_GET_TYPE(fc) == IEEE80211_FTYPE_MGMT &&
WLAN_FC_GET_STYPE(fc) == IEEE80211_STYPE_BEACON)
goto drop;
skb->protocol = __constant_htons(ETH_P_HOSTAP);
handle_ap_item(local, skb, rx_stats);
return;
drop:
dev_kfree_skb(skb);
}
/* Called only as a tasklet (software IRQ) */
static void schedule_packet_send(local_info_t *local, struct sta_info *sta)
{
struct sk_buff *skb;
struct ieee80211_hdr_4addr *hdr;
struct hostap_80211_rx_status rx_stats;
if (skb_queue_empty(&sta->tx_buf))
return;
skb = dev_alloc_skb(16);
if (skb == NULL) {
printk(KERN_DEBUG "%s: schedule_packet_send: skb alloc "
"failed\n", local->dev->name);
return;
}
hdr = (struct ieee80211_hdr_4addr *) skb_put(skb, 16);
/* Generate a fake pspoll frame to start packet delivery */
hdr->frame_ctl = __constant_cpu_to_le16(
IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL);
memcpy(hdr->addr1, local->dev->dev_addr, ETH_ALEN);
memcpy(hdr->addr2, sta->addr, ETH_ALEN);
hdr->duration_id = cpu_to_le16(sta->aid | BIT(15) | BIT(14));
PDEBUG(DEBUG_PS2, "%s: Scheduling buffered packet delivery for "
"STA " MACSTR "\n", local->dev->name, MAC2STR(sta->addr));
skb->dev = local->dev;
memset(&rx_stats, 0, sizeof(rx_stats));
hostap_rx(local->dev, skb, &rx_stats);
}
int prism2_ap_get_sta_qual(local_info_t *local, struct sockaddr addr[],
struct iw_quality qual[], int buf_size,
int aplist)
{
struct ap_data *ap = local->ap;
struct list_head *ptr;
int count = 0;
spin_lock_bh(&ap->sta_table_lock);
for (ptr = ap->sta_list.next; ptr != NULL && ptr != &ap->sta_list;
ptr = ptr->next) {
struct sta_info *sta = (struct sta_info *) ptr;
if (aplist && !sta->ap)
continue;
addr[count].sa_family = ARPHRD_ETHER;
memcpy(addr[count].sa_data, sta->addr, ETH_ALEN);
if (sta->last_rx_silence == 0)
qual[count].qual = sta->last_rx_signal < 27 ?
0 : (sta->last_rx_signal - 27) * 92 / 127;
else
qual[count].qual = sta->last_rx_signal -
sta->last_rx_silence - 35;
qual[count].level = HFA384X_LEVEL_TO_dBm(sta->last_rx_signal);
qual[count].noise = HFA384X_LEVEL_TO_dBm(sta->last_rx_silence);
qual[count].updated = sta->last_rx_updated;
sta->last_rx_updated = IW_QUAL_DBM;
count++;
if (count >= buf_size)
break;
}
spin_unlock_bh(&ap->sta_table_lock);
return count;
}
/* Translate our list of Access Points & Stations to a card independant
* format that the Wireless Tools will understand - Jean II */
int prism2_ap_translate_scan(struct net_device *dev, char *buffer)
{
struct hostap_interface *iface;
local_info_t *local;
struct ap_data *ap;
struct list_head *ptr;
struct iw_event iwe;
char *current_ev = buffer;
char *end_buf = buffer + IW_SCAN_MAX_DATA;
#if !defined(PRISM2_NO_KERNEL_IEEE80211_MGMT)
char buf[64];
#endif
iface = netdev_priv(dev);
local = iface->local;
ap = local->ap;
spin_lock_bh(&ap->sta_table_lock);
for (ptr = ap->sta_list.next; ptr != NULL && ptr != &ap->sta_list;
ptr = ptr->next) {
struct sta_info *sta = (struct sta_info *) ptr;
/* First entry *MUST* be the AP MAC address */
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = SIOCGIWAP;
iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
memcpy(iwe.u.ap_addr.sa_data, sta->addr, ETH_ALEN);
iwe.len = IW_EV_ADDR_LEN;
current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
IW_EV_ADDR_LEN);
/* Use the mode to indicate if it's a station or
* an Access Point */
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = SIOCGIWMODE;
if (sta->ap)
iwe.u.mode = IW_MODE_MASTER;
else
iwe.u.mode = IW_MODE_INFRA;
iwe.len = IW_EV_UINT_LEN;
current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
IW_EV_UINT_LEN);
/* Some quality */
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = IWEVQUAL;
if (sta->last_rx_silence == 0)
iwe.u.qual.qual = sta->last_rx_signal < 27 ?
0 : (sta->last_rx_signal - 27) * 92 / 127;
else
iwe.u.qual.qual = sta->last_rx_signal -
sta->last_rx_silence - 35;
iwe.u.qual.level = HFA384X_LEVEL_TO_dBm(sta->last_rx_signal);
iwe.u.qual.noise = HFA384X_LEVEL_TO_dBm(sta->last_rx_silence);
iwe.u.qual.updated = sta->last_rx_updated;
iwe.len = IW_EV_QUAL_LEN;
current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
IW_EV_QUAL_LEN);
#ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
if (sta->ap) {
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = SIOCGIWESSID;
iwe.u.data.length = sta->u.ap.ssid_len;
iwe.u.data.flags = 1;
current_ev = iwe_stream_add_point(current_ev, end_buf,
&iwe,
sta->u.ap.ssid);
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = SIOCGIWENCODE;
if (sta->capability & WLAN_CAPABILITY_PRIVACY)
iwe.u.data.flags =
IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
else
iwe.u.data.flags = IW_ENCODE_DISABLED;
current_ev = iwe_stream_add_point(current_ev, end_buf,
&iwe,
sta->u.ap.ssid
/* 0 byte memcpy */);
if (sta->u.ap.channel > 0 &&
sta->u.ap.channel <= FREQ_COUNT) {
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = SIOCGIWFREQ;
iwe.u.freq.m = freq_list[sta->u.ap.channel - 1]
* 100000;
iwe.u.freq.e = 1;
current_ev = iwe_stream_add_event(
current_ev, end_buf, &iwe,
IW_EV_FREQ_LEN);
}
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = IWEVCUSTOM;
sprintf(buf, "beacon_interval=%d",
sta->listen_interval);
iwe.u.data.length = strlen(buf);
current_ev = iwe_stream_add_point(current_ev, end_buf,
&iwe, buf);
}
#endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
sta->last_rx_updated = IW_QUAL_DBM;
/* To be continued, we should make good use of IWEVCUSTOM */
}
spin_unlock_bh(&ap->sta_table_lock);
return current_ev - buffer;
}
static int prism2_hostapd_add_sta(struct ap_data *ap,
struct prism2_hostapd_param *param)
{
struct sta_info *sta;
spin_lock_bh(&ap->sta_table_lock);
sta = ap_get_sta(ap, param->sta_addr);
if (sta)
atomic_inc(&sta->users);
spin_unlock_bh(&ap->sta_table_lock);
if (sta == NULL) {
sta = ap_add_sta(ap, param->sta_addr);
if (sta == NULL)
return -1;
}
if (!(sta->flags & WLAN_STA_ASSOC) && !sta->ap && sta->local)
hostap_event_new_sta(sta->local->dev, sta);
sta->flags |= WLAN_STA_AUTH | WLAN_STA_ASSOC;
sta->last_rx = jiffies;
sta->aid = param->u.add_sta.aid;
sta->capability = param->u.add_sta.capability;
sta->tx_supp_rates = param->u.add_sta.tx_supp_rates;
if (sta->tx_supp_rates & WLAN_RATE_1M)
sta->supported_rates[0] = 2;
if (sta->tx_supp_rates & WLAN_RATE_2M)
sta->supported_rates[1] = 4;
if (sta->tx_supp_rates & WLAN_RATE_5M5)
sta->supported_rates[2] = 11;
if (sta->tx_supp_rates & WLAN_RATE_11M)
sta->supported_rates[3] = 22;
prism2_check_tx_rates(sta);
atomic_dec(&sta->users);
return 0;
}
static int prism2_hostapd_remove_sta(struct ap_data *ap,
struct prism2_hostapd_param *param)
{
struct sta_info *sta;
spin_lock_bh(&ap->sta_table_lock);
sta = ap_get_sta(ap, param->sta_addr);
if (sta) {
ap_sta_hash_del(ap, sta);
list_del(&sta->list);
}
spin_unlock_bh(&ap->sta_table_lock);
if (!sta)
return -ENOENT;
if ((sta->flags & WLAN_STA_ASSOC) && !sta->ap && sta->local)
hostap_event_expired_sta(sta->local->dev, sta);
ap_free_sta(ap, sta);
return 0;
}
static int prism2_hostapd_get_info_sta(struct ap_data *ap,
struct prism2_hostapd_param *param)
{
struct sta_info *sta;
spin_lock_bh(&ap->sta_table_lock);
sta = ap_get_sta(ap, param->sta_addr);
if (sta)
atomic_inc(&sta->users);
spin_unlock_bh(&ap->sta_table_lock);
if (!sta)
return -ENOENT;
param->u.get_info_sta.inactive_sec = (jiffies - sta->last_rx) / HZ;
atomic_dec(&sta->users);
return 1;
}
static int prism2_hostapd_set_flags_sta(struct ap_data *ap,
struct prism2_hostapd_param *param)
{
struct sta_info *sta;
spin_lock_bh(&ap->sta_table_lock);
sta = ap_get_sta(ap, param->sta_addr);
if (sta) {
sta->flags |= param->u.set_flags_sta.flags_or;
sta->flags &= param->u.set_flags_sta.flags_and;
}
spin_unlock_bh(&ap->sta_table_lock);
if (!sta)
return -ENOENT;
return 0;
}
static int prism2_hostapd_sta_clear_stats(struct ap_data *ap,
struct prism2_hostapd_param *param)
{
struct sta_info *sta;
int rate;
spin_lock_bh(&ap->sta_table_lock);
sta = ap_get_sta(ap, param->sta_addr);
if (sta) {
sta->rx_packets = sta->tx_packets = 0;
sta->rx_bytes = sta->tx_bytes = 0;
for (rate = 0; rate < WLAN_RATE_COUNT; rate++) {
sta->tx_count[rate] = 0;
sta->rx_count[rate] = 0;
}
}
spin_unlock_bh(&ap->sta_table_lock);
if (!sta)
return -ENOENT;
return 0;
}
int prism2_hostapd(struct ap_data *ap, struct prism2_hostapd_param *param)
{
switch (param->cmd) {
case PRISM2_HOSTAPD_FLUSH:
ap_control_kickall(ap);
return 0;
case PRISM2_HOSTAPD_ADD_STA:
return prism2_hostapd_add_sta(ap, param);
case PRISM2_HOSTAPD_REMOVE_STA:
return prism2_hostapd_remove_sta(ap, param);
case PRISM2_HOSTAPD_GET_INFO_STA:
return prism2_hostapd_get_info_sta(ap, param);
case PRISM2_HOSTAPD_SET_FLAGS_STA:
return prism2_hostapd_set_flags_sta(ap, param);
case PRISM2_HOSTAPD_STA_CLEAR_STATS:
return prism2_hostapd_sta_clear_stats(ap, param);
default:
printk(KERN_WARNING "prism2_hostapd: unknown cmd=%d\n",
param->cmd);
return -EOPNOTSUPP;
}
}
/* Update station info for host-based TX rate control and return current
* TX rate */
static int ap_update_sta_tx_rate(struct sta_info *sta, struct net_device *dev)
{
int ret = sta->tx_rate;
struct hostap_interface *iface;
local_info_t *local;
iface = netdev_priv(dev);
local = iface->local;
sta->tx_count[sta->tx_rate_idx]++;
sta->tx_since_last_failure++;
sta->tx_consecutive_exc = 0;
if (sta->tx_since_last_failure >= WLAN_RATE_UPDATE_COUNT &&
sta->tx_rate_idx < sta->tx_max_rate) {
/* use next higher rate */
int old_rate, new_rate;
old_rate = new_rate = sta->tx_rate_idx;
while (new_rate < sta->tx_max_rate) {
new_rate++;
if (ap_tx_rate_ok(new_rate, sta, local)) {
sta->tx_rate_idx = new_rate;
break;
}
}
if (old_rate != sta->tx_rate_idx) {
switch (sta->tx_rate_idx) {
case 0: sta->tx_rate = 10; break;
case 1: sta->tx_rate = 20; break;
case 2: sta->tx_rate = 55; break;
case 3: sta->tx_rate = 110; break;
default: sta->tx_rate = 0; break;
}
PDEBUG(DEBUG_AP, "%s: STA " MACSTR " TX rate raised to"
" %d\n", dev->name, MAC2STR(sta->addr),
sta->tx_rate);
}
sta->tx_since_last_failure = 0;
}
return ret;
}
/* Called only from software IRQ. Called for each TX frame prior possible
* encryption and transmit. */
ap_tx_ret hostap_handle_sta_tx(local_info_t *local, struct hostap_tx_data *tx)
{
struct sta_info *sta = NULL;
struct sk_buff *skb = tx->skb;
int set_tim, ret;
struct ieee80211_hdr_4addr *hdr;
struct hostap_skb_tx_data *meta;
meta = (struct hostap_skb_tx_data *) skb->cb;
ret = AP_TX_CONTINUE;
if (local->ap == NULL || skb->len < 10 ||
meta->iface->type == HOSTAP_INTERFACE_STA)
goto out;
hdr = (struct ieee80211_hdr_4addr *) skb->data;
if (hdr->addr1[0] & 0x01) {
/* broadcast/multicast frame - no AP related processing */
goto out;
}
/* unicast packet - check whether destination STA is associated */
spin_lock(&local->ap->sta_table_lock);
sta = ap_get_sta(local->ap, hdr->addr1);
if (sta)
atomic_inc(&sta->users);
spin_unlock(&local->ap->sta_table_lock);
if (local->iw_mode == IW_MODE_MASTER && sta == NULL &&
!(meta->flags & HOSTAP_TX_FLAGS_WDS) &&
meta->iface->type != HOSTAP_INTERFACE_MASTER &&
meta->iface->type != HOSTAP_INTERFACE_AP) {
#if 0
/* This can happen, e.g., when wlan0 is added to a bridge and
* bridging code does not know which port is the correct target
* for a unicast frame. In this case, the packet is send to all
* ports of the bridge. Since this is a valid scenario, do not
* print out any errors here. */
if (net_ratelimit()) {
printk(KERN_DEBUG "AP: drop packet to non-associated "
"STA " MACSTR "\n", MAC2STR(hdr->addr1));
}
#endif
local->ap->tx_drop_nonassoc++;
ret = AP_TX_DROP;
goto out;
}
if (sta == NULL)
goto out;
if (!(sta->flags & WLAN_STA_AUTHORIZED))
ret = AP_TX_CONTINUE_NOT_AUTHORIZED;
/* Set tx_rate if using host-based TX rate control */
if (!local->fw_tx_rate_control)
local->ap->last_tx_rate = meta->rate =
ap_update_sta_tx_rate(sta, local->dev);
if (local->iw_mode != IW_MODE_MASTER)
goto out;
if (!(sta->flags & WLAN_STA_PS))
goto out;
if (meta->flags & HOSTAP_TX_FLAGS_ADD_MOREDATA) {
/* indicate to STA that more frames follow */
hdr->frame_ctl |=
__constant_cpu_to_le16(IEEE80211_FCTL_MOREDATA);
}
if (meta->flags & HOSTAP_TX_FLAGS_BUFFERED_FRAME) {
/* packet was already buffered and now send due to
* PS poll, so do not rebuffer it */
goto out;
}
if (skb_queue_len(&sta->tx_buf) >= STA_MAX_TX_BUFFER) {
PDEBUG(DEBUG_PS, "%s: No more space in STA (" MACSTR ")'s PS "
"mode buffer\n", local->dev->name, MAC2STR(sta->addr));
/* Make sure that TIM is set for the station (it might not be
* after AP wlan hw reset). */
/* FIX: should fix hw reset to restore bits based on STA
* buffer state.. */
hostap_set_tim(local, sta->aid, 1);
sta->flags |= WLAN_STA_TIM;
ret = AP_TX_DROP;
goto out;
}
/* STA in PS mode, buffer frame for later delivery */
set_tim = skb_queue_empty(&sta->tx_buf);
skb_queue_tail(&sta->tx_buf, skb);
/* FIX: could save RX time to skb and expire buffered frames after
* some time if STA does not poll for them */
if (set_tim) {
if (sta->flags & WLAN_STA_TIM)
PDEBUG(DEBUG_PS2, "Re-setting TIM for aid %d\n",
sta->aid);
hostap_set_tim(local, sta->aid, 1);
sta->flags |= WLAN_STA_TIM;
}
ret = AP_TX_BUFFERED;
out:
if (sta != NULL) {
if (ret == AP_TX_CONTINUE ||
ret == AP_TX_CONTINUE_NOT_AUTHORIZED) {
sta->tx_packets++;
sta->tx_bytes += skb->len;
sta->last_tx = jiffies;
}
if ((ret == AP_TX_CONTINUE ||
ret == AP_TX_CONTINUE_NOT_AUTHORIZED) &&
sta->crypt && tx->host_encrypt) {
tx->crypt = sta->crypt;
tx->sta_ptr = sta; /* hostap_handle_sta_release() will
* be called to release sta info
* later */
} else
atomic_dec(&sta->users);
}
return ret;
}
void hostap_handle_sta_release(void *ptr)
{
struct sta_info *sta = ptr;
atomic_dec(&sta->users);
}
/* Called only as a tasklet (software IRQ) */
void hostap_handle_sta_tx_exc(local_info_t *local, struct sk_buff *skb)
{
struct sta_info *sta;
struct ieee80211_hdr_4addr *hdr;
struct hostap_skb_tx_data *meta;
hdr = (struct ieee80211_hdr_4addr *) skb->data;
meta = (struct hostap_skb_tx_data *) skb->cb;
spin_lock(&local->ap->sta_table_lock);
sta = ap_get_sta(local->ap, hdr->addr1);
if (!sta) {
spin_unlock(&local->ap->sta_table_lock);
PDEBUG(DEBUG_AP, "%s: Could not find STA " MACSTR " for this "
"TX error (@%lu)\n",
local->dev->name, MAC2STR(hdr->addr1), jiffies);
return;
}
sta->tx_since_last_failure = 0;
sta->tx_consecutive_exc++;
if (sta->tx_consecutive_exc >= WLAN_RATE_DECREASE_THRESHOLD &&
sta->tx_rate_idx > 0 && meta->rate <= sta->tx_rate) {
/* use next lower rate */
int old, rate;
old = rate = sta->tx_rate_idx;
while (rate > 0) {
rate--;
if (ap_tx_rate_ok(rate, sta, local)) {
sta->tx_rate_idx = rate;
break;
}
}
if (old != sta->tx_rate_idx) {
switch (sta->tx_rate_idx) {
case 0: sta->tx_rate = 10; break;
case 1: sta->tx_rate = 20; break;
case 2: sta->tx_rate = 55; break;
case 3: sta->tx_rate = 110; break;
default: sta->tx_rate = 0; break;
}
PDEBUG(DEBUG_AP, "%s: STA " MACSTR " TX rate lowered "
"to %d\n", local->dev->name, MAC2STR(sta->addr),
sta->tx_rate);
}
sta->tx_consecutive_exc = 0;
}
spin_unlock(&local->ap->sta_table_lock);
}
static void hostap_update_sta_ps2(local_info_t *local, struct sta_info *sta,
int pwrmgt, int type, int stype)
{
if (pwrmgt && !(sta->flags & WLAN_STA_PS)) {
sta->flags |= WLAN_STA_PS;
PDEBUG(DEBUG_PS2, "STA " MACSTR " changed to use PS "
"mode (type=0x%02X, stype=0x%02X)\n",
MAC2STR(sta->addr), type >> 2, stype >> 4);
} else if (!pwrmgt && (sta->flags & WLAN_STA_PS)) {
sta->flags &= ~WLAN_STA_PS;
PDEBUG(DEBUG_PS2, "STA " MACSTR " changed to not use "
"PS mode (type=0x%02X, stype=0x%02X)\n",
MAC2STR(sta->addr), type >> 2, stype >> 4);
if (type != IEEE80211_FTYPE_CTL ||
stype != IEEE80211_STYPE_PSPOLL)
schedule_packet_send(local, sta);
}
}
/* Called only as a tasklet (software IRQ). Called for each RX frame to update
* STA power saving state. pwrmgt is a flag from 802.11 frame_ctl field. */
int hostap_update_sta_ps(local_info_t *local, struct ieee80211_hdr_4addr *hdr)
{
struct sta_info *sta;
u16 fc;
spin_lock(&local->ap->sta_table_lock);
sta = ap_get_sta(local->ap, hdr->addr2);
if (sta)
atomic_inc(&sta->users);
spin_unlock(&local->ap->sta_table_lock);
if (!sta)
return -1;
fc = le16_to_cpu(hdr->frame_ctl);
hostap_update_sta_ps2(local, sta, fc & IEEE80211_FCTL_PM,
WLAN_FC_GET_TYPE(fc), WLAN_FC_GET_STYPE(fc));
atomic_dec(&sta->users);
return 0;
}
/* Called only as a tasklet (software IRQ). Called for each RX frame after
* getting RX header and payload from hardware. */
ap_rx_ret hostap_handle_sta_rx(local_info_t *local, struct net_device *dev,
struct sk_buff *skb,
struct hostap_80211_rx_status *rx_stats,
int wds)
{
int ret;
struct sta_info *sta;
u16 fc, type, stype;
struct ieee80211_hdr_4addr *hdr;
if (local->ap == NULL)
return AP_RX_CONTINUE;
hdr = (struct ieee80211_hdr_4addr *) skb->data;
fc = le16_to_cpu(hdr->frame_ctl);
type = WLAN_FC_GET_TYPE(fc);
stype = WLAN_FC_GET_STYPE(fc);
spin_lock(&local->ap->sta_table_lock);
sta = ap_get_sta(local->ap, hdr->addr2);
if (sta)
atomic_inc(&sta->users);
spin_unlock(&local->ap->sta_table_lock);
if (sta && !(sta->flags & WLAN_STA_AUTHORIZED))
ret = AP_RX_CONTINUE_NOT_AUTHORIZED;
else
ret = AP_RX_CONTINUE;
if (fc & IEEE80211_FCTL_TODS) {
if (!wds && (sta == NULL || !(sta->flags & WLAN_STA_ASSOC))) {
if (local->hostapd) {
prism2_rx_80211(local->apdev, skb, rx_stats,
PRISM2_RX_NON_ASSOC);
#ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
} else {
printk(KERN_DEBUG "%s: dropped received packet"
" from non-associated STA " MACSTR
" (type=0x%02x, subtype=0x%02x)\n",
dev->name, MAC2STR(hdr->addr2),
type >> 2, stype >> 4);
hostap_rx(dev, skb, rx_stats);
#endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
}
ret = AP_RX_EXIT;
goto out;
}
} else if (fc & IEEE80211_FCTL_FROMDS) {
if (!wds) {
/* FromDS frame - not for us; probably
* broadcast/multicast in another BSS - drop */
if (memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0) {
printk(KERN_DEBUG "Odd.. FromDS packet "
"received with own BSSID\n");
hostap_dump_rx_80211(dev->name, skb, rx_stats);
}
ret = AP_RX_DROP;
goto out;
}
} else if (stype == IEEE80211_STYPE_NULLFUNC && sta == NULL &&
memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0) {
if (local->hostapd) {
prism2_rx_80211(local->apdev, skb, rx_stats,
PRISM2_RX_NON_ASSOC);
#ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
} else {
/* At least Lucent f/w seems to send data::nullfunc
* frames with no ToDS flag when the current AP returns
* after being unavailable for some time. Speed up
* re-association by informing the station about it not
* being associated. */
printk(KERN_DEBUG "%s: rejected received nullfunc "
"frame without ToDS from not associated STA "
MACSTR "\n",
dev->name, MAC2STR(hdr->addr2));
hostap_rx(dev, skb, rx_stats);
#endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
}
ret = AP_RX_EXIT;
goto out;
} else if (stype == IEEE80211_STYPE_NULLFUNC) {
/* At least Lucent cards seem to send periodic nullfunc
* frames with ToDS. Let these through to update SQ
* stats and PS state. Nullfunc frames do not contain
* any data and they will be dropped below. */
} else {
/* If BSSID (Addr3) is foreign, this frame is a normal
* broadcast frame from an IBSS network. Drop it silently.
* If BSSID is own, report the dropping of this frame. */
if (memcmp(hdr->addr3, dev->dev_addr, ETH_ALEN) == 0) {
printk(KERN_DEBUG "%s: dropped received packet from "
MACSTR " with no ToDS flag (type=0x%02x, "
"subtype=0x%02x)\n", dev->name,
MAC2STR(hdr->addr2), type >> 2, stype >> 4);
hostap_dump_rx_80211(dev->name, skb, rx_stats);
}
ret = AP_RX_DROP;
goto out;
}
if (sta) {
hostap_update_sta_ps2(local, sta, fc & IEEE80211_FCTL_PM,
type, stype);
sta->rx_packets++;
sta->rx_bytes += skb->len;
sta->last_rx = jiffies;
}
if (local->ap->nullfunc_ack && stype == IEEE80211_STYPE_NULLFUNC &&
fc & IEEE80211_FCTL_TODS) {
if (local->hostapd) {
prism2_rx_80211(local->apdev, skb, rx_stats,
PRISM2_RX_NULLFUNC_ACK);
#ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
} else {
/* some STA f/w's seem to require control::ACK frame
* for data::nullfunc, but Prism2 f/w 0.8.0 (at least
* from Compaq) does not send this.. Try to generate
* ACK for these frames from the host driver to make
* power saving work with, e.g., Lucent WaveLAN f/w */
hostap_rx(dev, skb, rx_stats);
#endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
}
ret = AP_RX_EXIT;
goto out;
}
out:
if (sta)
atomic_dec(&sta->users);
return ret;
}
/* Called only as a tasklet (software IRQ) */
int hostap_handle_sta_crypto(local_info_t *local,
struct ieee80211_hdr_4addr *hdr,
struct ieee80211_crypt_data **crypt,
void **sta_ptr)
{
struct sta_info *sta;
spin_lock(&local->ap->sta_table_lock);
sta = ap_get_sta(local->ap, hdr->addr2);
if (sta)
atomic_inc(&sta->users);
spin_unlock(&local->ap->sta_table_lock);
if (!sta)
return -1;
if (sta->crypt) {
*crypt = sta->crypt;
*sta_ptr = sta;
/* hostap_handle_sta_release() will be called to release STA
* info */
} else
atomic_dec(&sta->users);
return 0;
}
/* Called only as a tasklet (software IRQ) */
int hostap_is_sta_assoc(struct ap_data *ap, u8 *sta_addr)
{
struct sta_info *sta;
int ret = 0;
spin_lock(&ap->sta_table_lock);
sta = ap_get_sta(ap, sta_addr);
if (sta != NULL && (sta->flags & WLAN_STA_ASSOC) && !sta->ap)
ret = 1;
spin_unlock(&ap->sta_table_lock);
return ret;
}
/* Called only as a tasklet (software IRQ) */
int hostap_is_sta_authorized(struct ap_data *ap, u8 *sta_addr)
{
struct sta_info *sta;
int ret = 0;
spin_lock(&ap->sta_table_lock);
sta = ap_get_sta(ap, sta_addr);
if (sta != NULL && (sta->flags & WLAN_STA_ASSOC) && !sta->ap &&
((sta->flags & WLAN_STA_AUTHORIZED) ||
ap->local->ieee_802_1x == 0))
ret = 1;
spin_unlock(&ap->sta_table_lock);
return ret;
}
/* Called only as a tasklet (software IRQ) */
int hostap_add_sta(struct ap_data *ap, u8 *sta_addr)
{
struct sta_info *sta;
int ret = 1;
if (!ap)
return -1;
spin_lock(&ap->sta_table_lock);
sta = ap_get_sta(ap, sta_addr);
if (sta)
ret = 0;
spin_unlock(&ap->sta_table_lock);
if (ret == 1) {
sta = ap_add_sta(ap, sta_addr);
if (!sta)
return -1;
sta->flags = WLAN_STA_AUTH | WLAN_STA_ASSOC;
sta->ap = 1;
memset(sta->supported_rates, 0, sizeof(sta->supported_rates));
/* No way of knowing which rates are supported since we did not
* get supported rates element from beacon/assoc req. Assume
* that remote end supports all 802.11b rates. */
sta->supported_rates[0] = 0x82;
sta->supported_rates[1] = 0x84;
sta->supported_rates[2] = 0x0b;
sta->supported_rates[3] = 0x16;
sta->tx_supp_rates = WLAN_RATE_1M | WLAN_RATE_2M |
WLAN_RATE_5M5 | WLAN_RATE_11M;
sta->tx_rate = 110;
sta->tx_max_rate = sta->tx_rate_idx = 3;
}
return ret;
}
/* Called only as a tasklet (software IRQ) */
int hostap_update_rx_stats(struct ap_data *ap,
struct ieee80211_hdr_4addr *hdr,
struct hostap_80211_rx_status *rx_stats)
{
struct sta_info *sta;
if (!ap)
return -1;
spin_lock(&ap->sta_table_lock);
sta = ap_get_sta(ap, hdr->addr2);
if (sta) {
sta->last_rx_silence = rx_stats->noise;
sta->last_rx_signal = rx_stats->signal;
sta->last_rx_rate = rx_stats->rate;
sta->last_rx_updated = IW_QUAL_ALL_UPDATED | IW_QUAL_DBM;
if (rx_stats->rate == 10)
sta->rx_count[0]++;
else if (rx_stats->rate == 20)
sta->rx_count[1]++;
else if (rx_stats->rate == 55)
sta->rx_count[2]++;
else if (rx_stats->rate == 110)
sta->rx_count[3]++;
}
spin_unlock(&ap->sta_table_lock);
return sta ? 0 : -1;
}
void hostap_update_rates(local_info_t *local)
{
struct list_head *ptr;
struct ap_data *ap = local->ap;
if (!ap)
return;
spin_lock_bh(&ap->sta_table_lock);
for (ptr = ap->sta_list.next; ptr != &ap->sta_list; ptr = ptr->next) {
struct sta_info *sta = (struct sta_info *) ptr;
prism2_check_tx_rates(sta);
}
spin_unlock_bh(&ap->sta_table_lock);
}
void * ap_crypt_get_ptrs(struct ap_data *ap, u8 *addr, int permanent,
struct ieee80211_crypt_data ***crypt)
{
struct sta_info *sta;
spin_lock_bh(&ap->sta_table_lock);
sta = ap_get_sta(ap, addr);
if (sta)
atomic_inc(&sta->users);
spin_unlock_bh(&ap->sta_table_lock);
if (!sta && permanent)
sta = ap_add_sta(ap, addr);
if (!sta)
return NULL;
if (permanent)
sta->flags |= WLAN_STA_PERM;
*crypt = &sta->crypt;
return sta;
}
void hostap_add_wds_links(local_info_t *local)
{
struct ap_data *ap = local->ap;
struct list_head *ptr;
spin_lock_bh(&ap->sta_table_lock);
list_for_each(ptr, &ap->sta_list) {
struct sta_info *sta = list_entry(ptr, struct sta_info, list);
if (sta->ap)
hostap_wds_link_oper(local, sta->addr, WDS_ADD);
}
spin_unlock_bh(&ap->sta_table_lock);
schedule_work(&local->ap->wds_oper_queue);
}
void hostap_wds_link_oper(local_info_t *local, u8 *addr, wds_oper_type type)
{
struct wds_oper_data *entry;
entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
if (!entry)
return;
memcpy(entry->addr, addr, ETH_ALEN);
entry->type = type;
spin_lock_bh(&local->lock);
entry->next = local->ap->wds_oper_entries;
local->ap->wds_oper_entries = entry;
spin_unlock_bh(&local->lock);
schedule_work(&local->ap->wds_oper_queue);
}
EXPORT_SYMBOL(hostap_init_data);
EXPORT_SYMBOL(hostap_init_ap_proc);
EXPORT_SYMBOL(hostap_free_data);
EXPORT_SYMBOL(hostap_check_sta_fw_version);
EXPORT_SYMBOL(hostap_handle_sta_tx);
EXPORT_SYMBOL(hostap_handle_sta_release);
EXPORT_SYMBOL(hostap_handle_sta_tx_exc);
EXPORT_SYMBOL(hostap_update_sta_ps);
EXPORT_SYMBOL(hostap_handle_sta_rx);
EXPORT_SYMBOL(hostap_is_sta_assoc);
EXPORT_SYMBOL(hostap_is_sta_authorized);
EXPORT_SYMBOL(hostap_add_sta);
EXPORT_SYMBOL(hostap_update_rates);
EXPORT_SYMBOL(hostap_add_wds_links);
EXPORT_SYMBOL(hostap_wds_link_oper);
#ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
EXPORT_SYMBOL(hostap_deauth_all_stas);
#endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
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