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linux-next/net/ieee80211/ieee80211_rx.c
Bruno Randolf 566bfe5a8b mac80211: use hardware flags for signal/noise units 
trying to clean up the signal/noise code. the previous code in mac80211 had
confusing names for the related variables, did not have much definition of
what units of signal and noise were provided and used implicit mechanisms from
the wireless extensions.

this patch introduces hardware capability flags to let the hardware specify
clearly if it can provide signal and noise level values and which units it can
provide. this also anticipates possible new units like RCPI in the future.

for signal:

  IEEE80211_HW_SIGNAL_UNSPEC - unspecified, unknown, hw specific
  IEEE80211_HW_SIGNAL_DB     - dB difference to unspecified reference point
  IEEE80211_HW_SIGNAL_DBM    - dBm, difference to 1mW

for noise we currently only have dBm:

  IEEE80211_HW_NOISE_DBM     - dBm, difference to 1mW

if IEEE80211_HW_SIGNAL_UNSPEC or IEEE80211_HW_SIGNAL_DB is used the driver has
to provide the maximum value (max_signal) it reports in order for applications
to make sense of the signal values.

i tried my best to find out for each driver what it can provide and update it
but i'm not sure (?) for some of them and used the more conservative guess in
doubt. this can be fixed easily after this patch has been merged by changing
the hardware flags of the driver.

DRIVER          SIGNAL    MAX	NOISE   QUAL
-----------------------------------------------------------------
adm8211         unspec(?) 100   n/a     missing
at76_usb        unspec(?) (?)   unused  missing
ath5k           dBm             dBm     percent rssi
b43legacy       dBm             dBm     percent jssi(?)
b43             dBm             dBm     percent jssi(?)
iwl-3945        dBm             dBm     percent snr+more
iwl-4965        dBm             dBm     percent snr+more
p54             unspec    127   n/a     missing
rt2x00          dBm	        n/a     percent rssi+tx/rx frame success
  rt2400        dBm             n/a
  rt2500pci     dBm             n/a
  rt2500usb     dBm             n/a
  rt61pci       dBm             n/a
  rt73usb       dBm             n/a
rtl8180         unspec(?) 65    n/a     (?)
rtl8187         unspec(?) 65    (?)     noise(?)
zd1211          dB(?)     100   n/a     percent

drivers/net/wireless/ath5k/base.c:      Changes-licensed-under: 3-Clause-BSD

Signed-off-by: Bruno Randolf <br1@einfach.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2008-05-14 16:29:49 -04:00

1832 lines
52 KiB
C
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/*
* Original code based Host AP (software wireless LAN access point) driver
* for Intersil Prism2/2.5/3 - hostap.o module, common routines
*
* Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen
* <j@w1.fi>
* Copyright (c) 2002-2003, Jouni Malinen <j@w1.fi>
* Copyright (c) 2004-2005, Intel Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation. See README and COPYING for
* more details.
*/
#include <linux/compiler.h>
#include <linux/errno.h>
#include <linux/if_arp.h>
#include <linux/in6.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/proc_fs.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/tcp.h>
#include <linux/types.h>
#include <linux/wireless.h>
#include <linux/etherdevice.h>
#include <asm/uaccess.h>
#include <linux/ctype.h>
#include <net/ieee80211.h>
static void ieee80211_monitor_rx(struct ieee80211_device *ieee,
struct sk_buff *skb,
struct ieee80211_rx_stats *rx_stats)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
u16 fc = le16_to_cpu(hdr->frame_ctl);
skb->dev = ieee->dev;
skb_reset_mac_header(skb);
skb_pull(skb, ieee80211_get_hdrlen(fc));
skb->pkt_type = PACKET_OTHERHOST;
skb->protocol = htons(ETH_P_80211_RAW);
memset(skb->cb, 0, sizeof(skb->cb));
netif_rx(skb);
}
/* Called only as a tasklet (software IRQ) */
static struct ieee80211_frag_entry *ieee80211_frag_cache_find(struct
ieee80211_device
*ieee,
unsigned int seq,
unsigned int frag,
u8 * src,
u8 * dst)
{
struct ieee80211_frag_entry *entry;
int i;
for (i = 0; i < IEEE80211_FRAG_CACHE_LEN; i++) {
entry = &ieee->frag_cache[i];
if (entry->skb != NULL &&
time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
IEEE80211_DEBUG_FRAG("expiring fragment cache entry "
"seq=%u last_frag=%u\n",
entry->seq, entry->last_frag);
dev_kfree_skb_any(entry->skb);
entry->skb = NULL;
}
if (entry->skb != NULL && entry->seq == seq &&
(entry->last_frag + 1 == frag || frag == -1) &&
!compare_ether_addr(entry->src_addr, src) &&
!compare_ether_addr(entry->dst_addr, dst))
return entry;
}
return NULL;
}
/* Called only as a tasklet (software IRQ) */
static struct sk_buff *ieee80211_frag_cache_get(struct ieee80211_device *ieee,
struct ieee80211_hdr_4addr *hdr)
{
struct sk_buff *skb = NULL;
u16 sc;
unsigned int frag, seq;
struct ieee80211_frag_entry *entry;
sc = le16_to_cpu(hdr->seq_ctl);
frag = WLAN_GET_SEQ_FRAG(sc);
seq = WLAN_GET_SEQ_SEQ(sc);
if (frag == 0) {
/* Reserve enough space to fit maximum frame length */
skb = dev_alloc_skb(ieee->dev->mtu +
sizeof(struct ieee80211_hdr_4addr) +
8 /* LLC */ +
2 /* alignment */ +
8 /* WEP */ + ETH_ALEN /* WDS */ );
if (skb == NULL)
return NULL;
entry = &ieee->frag_cache[ieee->frag_next_idx];
ieee->frag_next_idx++;
if (ieee->frag_next_idx >= IEEE80211_FRAG_CACHE_LEN)
ieee->frag_next_idx = 0;
if (entry->skb != NULL)
dev_kfree_skb_any(entry->skb);
entry->first_frag_time = jiffies;
entry->seq = seq;
entry->last_frag = frag;
entry->skb = skb;
memcpy(entry->src_addr, hdr->addr2, ETH_ALEN);
memcpy(entry->dst_addr, hdr->addr1, ETH_ALEN);
} else {
/* received a fragment of a frame for which the head fragment
* should have already been received */
entry = ieee80211_frag_cache_find(ieee, seq, frag, hdr->addr2,
hdr->addr1);
if (entry != NULL) {
entry->last_frag = frag;
skb = entry->skb;
}
}
return skb;
}
/* Called only as a tasklet (software IRQ) */
static int ieee80211_frag_cache_invalidate(struct ieee80211_device *ieee,
struct ieee80211_hdr_4addr *hdr)
{
u16 sc;
unsigned int seq;
struct ieee80211_frag_entry *entry;
sc = le16_to_cpu(hdr->seq_ctl);
seq = WLAN_GET_SEQ_SEQ(sc);
entry = ieee80211_frag_cache_find(ieee, seq, -1, hdr->addr2,
hdr->addr1);
if (entry == NULL) {
IEEE80211_DEBUG_FRAG("could not invalidate fragment cache "
"entry (seq=%u)\n", seq);
return -1;
}
entry->skb = NULL;
return 0;
}
#ifdef NOT_YET
/* ieee80211_rx_frame_mgtmt
*
* Responsible for handling management control frames
*
* Called by ieee80211_rx */
static int
ieee80211_rx_frame_mgmt(struct ieee80211_device *ieee, struct sk_buff *skb,
struct ieee80211_rx_stats *rx_stats, u16 type,
u16 stype)
{
if (ieee->iw_mode == IW_MODE_MASTER) {
printk(KERN_DEBUG "%s: Master mode not yet suppported.\n",
ieee->dev->name);
return 0;
/*
hostap_update_sta_ps(ieee, (struct hostap_ieee80211_hdr_4addr *)
skb->data);*/
}
if (ieee->hostapd && type == WLAN_FC_TYPE_MGMT) {
if (stype == WLAN_FC_STYPE_BEACON &&
ieee->iw_mode == IW_MODE_MASTER) {
struct sk_buff *skb2;
/* Process beacon frames also in kernel driver to
* update STA(AP) table statistics */
skb2 = skb_clone(skb, GFP_ATOMIC);
if (skb2)
hostap_rx(skb2->dev, skb2, rx_stats);
}
/* send management frames to the user space daemon for
* processing */
ieee->apdevstats.rx_packets++;
ieee->apdevstats.rx_bytes += skb->len;
prism2_rx_80211(ieee->apdev, skb, rx_stats, PRISM2_RX_MGMT);
return 0;
}
if (ieee->iw_mode == IW_MODE_MASTER) {
if (type != WLAN_FC_TYPE_MGMT && type != WLAN_FC_TYPE_CTRL) {
printk(KERN_DEBUG "%s: unknown management frame "
"(type=0x%02x, stype=0x%02x) dropped\n",
skb->dev->name, type, stype);
return -1;
}
hostap_rx(skb->dev, skb, rx_stats);
return 0;
}
printk(KERN_DEBUG "%s: hostap_rx_frame_mgmt: management frame "
"received in non-Host AP mode\n", skb->dev->name);
return -1;
}
#endif
/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
/* Ethernet-II snap header (RFC1042 for most EtherTypes) */
static unsigned char rfc1042_header[] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
static unsigned char bridge_tunnel_header[] =
{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
/* No encapsulation header if EtherType < 0x600 (=length) */
/* Called by ieee80211_rx_frame_decrypt */
static int ieee80211_is_eapol_frame(struct ieee80211_device *ieee,
struct sk_buff *skb)
{
struct net_device *dev = ieee->dev;
u16 fc, ethertype;
struct ieee80211_hdr_3addr *hdr;
u8 *pos;
if (skb->len < 24)
return 0;
hdr = (struct ieee80211_hdr_3addr *)skb->data;
fc = le16_to_cpu(hdr->frame_ctl);
/* check that the frame is unicast frame to us */
if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
IEEE80211_FCTL_TODS &&
!compare_ether_addr(hdr->addr1, dev->dev_addr) &&
!compare_ether_addr(hdr->addr3, dev->dev_addr)) {
/* ToDS frame with own addr BSSID and DA */
} else if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
IEEE80211_FCTL_FROMDS &&
!compare_ether_addr(hdr->addr1, dev->dev_addr)) {
/* FromDS frame with own addr as DA */
} else
return 0;
if (skb->len < 24 + 8)
return 0;
/* check for port access entity Ethernet type */
pos = skb->data + 24;
ethertype = (pos[6] << 8) | pos[7];
if (ethertype == ETH_P_PAE)
return 1;
return 0;
}
/* Called only as a tasklet (software IRQ), by ieee80211_rx */
static int
ieee80211_rx_frame_decrypt(struct ieee80211_device *ieee, struct sk_buff *skb,
struct ieee80211_crypt_data *crypt)
{
struct ieee80211_hdr_3addr *hdr;
int res, hdrlen;
if (crypt == NULL || crypt->ops->decrypt_mpdu == NULL)
return 0;
hdr = (struct ieee80211_hdr_3addr *)skb->data;
hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
atomic_inc(&crypt->refcnt);
res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv);
atomic_dec(&crypt->refcnt);
if (res < 0) {
IEEE80211_DEBUG_DROP("decryption failed (SA=" MAC_FMT
") res=%d\n",
hdr->addr2[0], hdr->addr2[1],
hdr->addr2[2], hdr->addr2[3],
hdr->addr2[4], hdr->addr2[5],
res);
if (res == -2)
IEEE80211_DEBUG_DROP("Decryption failed ICV "
"mismatch (key %d)\n",
skb->data[hdrlen + 3] >> 6);
ieee->ieee_stats.rx_discards_undecryptable++;
return -1;
}
return res;
}
/* Called only as a tasklet (software IRQ), by ieee80211_rx */
static int
ieee80211_rx_frame_decrypt_msdu(struct ieee80211_device *ieee,
struct sk_buff *skb, int keyidx,
struct ieee80211_crypt_data *crypt)
{
struct ieee80211_hdr_3addr *hdr;
int res, hdrlen;
if (crypt == NULL || crypt->ops->decrypt_msdu == NULL)
return 0;
hdr = (struct ieee80211_hdr_3addr *)skb->data;
hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
atomic_inc(&crypt->refcnt);
res = crypt->ops->decrypt_msdu(skb, keyidx, hdrlen, crypt->priv);
atomic_dec(&crypt->refcnt);
if (res < 0) {
printk(KERN_DEBUG "%s: MSDU decryption/MIC verification failed"
" (SA=" MAC_FMT " keyidx=%d)\n",
ieee->dev->name,
hdr->addr2[0], hdr->addr2[1],
hdr->addr2[2], hdr->addr2[3],
hdr->addr2[4], hdr->addr2[5],
keyidx);
return -1;
}
return 0;
}
/* All received frames are sent to this function. @skb contains the frame in
* IEEE 802.11 format, i.e., in the format it was sent over air.
* This function is called only as a tasklet (software IRQ). */
int ieee80211_rx(struct ieee80211_device *ieee, struct sk_buff *skb,
struct ieee80211_rx_stats *rx_stats)
{
struct net_device *dev = ieee->dev;
struct ieee80211_hdr_4addr *hdr;
size_t hdrlen;
u16 fc, type, stype, sc;
struct net_device_stats *stats;
unsigned int frag;
u8 *payload;
u16 ethertype;
#ifdef NOT_YET
struct net_device *wds = NULL;
struct sk_buff *skb2 = NULL;
struct net_device *wds = NULL;
int frame_authorized = 0;
int from_assoc_ap = 0;
void *sta = NULL;
#endif
u8 dst[ETH_ALEN];
u8 src[ETH_ALEN];
struct ieee80211_crypt_data *crypt = NULL;
int keyidx = 0;
int can_be_decrypted = 0;
DECLARE_MAC_BUF(mac);
hdr = (struct ieee80211_hdr_4addr *)skb->data;
stats = &ieee->stats;
if (skb->len < 10) {
printk(KERN_INFO "%s: SKB length < 10\n", dev->name);
goto rx_dropped;
}
fc = le16_to_cpu(hdr->frame_ctl);
type = WLAN_FC_GET_TYPE(fc);
stype = WLAN_FC_GET_STYPE(fc);
sc = le16_to_cpu(hdr->seq_ctl);
frag = WLAN_GET_SEQ_FRAG(sc);
hdrlen = ieee80211_get_hdrlen(fc);
if (skb->len < hdrlen) {
printk(KERN_INFO "%s: invalid SKB length %d\n",
dev->name, skb->len);
goto rx_dropped;
}
/* Put this code here so that we avoid duplicating it in all
* Rx paths. - Jean II */
#ifdef CONFIG_WIRELESS_EXT
#ifdef IW_WIRELESS_SPY /* defined in iw_handler.h */
/* If spy monitoring on */
if (ieee->spy_data.spy_number > 0) {
struct iw_quality wstats;
wstats.updated = 0;
if (rx_stats->mask & IEEE80211_STATMASK_RSSI) {
wstats.level = rx_stats->signal;
wstats.updated |= IW_QUAL_LEVEL_UPDATED;
} else
wstats.updated |= IW_QUAL_LEVEL_INVALID;
if (rx_stats->mask & IEEE80211_STATMASK_NOISE) {
wstats.noise = rx_stats->noise;
wstats.updated |= IW_QUAL_NOISE_UPDATED;
} else
wstats.updated |= IW_QUAL_NOISE_INVALID;
if (rx_stats->mask & IEEE80211_STATMASK_SIGNAL) {
wstats.qual = rx_stats->signal;
wstats.updated |= IW_QUAL_QUAL_UPDATED;
} else
wstats.updated |= IW_QUAL_QUAL_INVALID;
/* Update spy records */
wireless_spy_update(ieee->dev, hdr->addr2, &wstats);
}
#endif /* IW_WIRELESS_SPY */
#endif /* CONFIG_WIRELESS_EXT */
#ifdef NOT_YET
hostap_update_rx_stats(local->ap, hdr, rx_stats);
#endif
if (ieee->iw_mode == IW_MODE_MONITOR) {
stats->rx_packets++;
stats->rx_bytes += skb->len;
ieee80211_monitor_rx(ieee, skb, rx_stats);
return 1;
}
can_be_decrypted = (is_multicast_ether_addr(hdr->addr1) ||
is_broadcast_ether_addr(hdr->addr2)) ?
ieee->host_mc_decrypt : ieee->host_decrypt;
if (can_be_decrypted) {
if (skb->len >= hdrlen + 3) {
/* Top two-bits of byte 3 are the key index */
keyidx = skb->data[hdrlen + 3] >> 6;
}
/* ieee->crypt[] is WEP_KEY (4) in length. Given that keyidx
* is only allowed 2-bits of storage, no value of keyidx can
* be provided via above code that would result in keyidx
* being out of range */
crypt = ieee->crypt[keyidx];
#ifdef NOT_YET
sta = NULL;
/* Use station specific key to override default keys if the
* receiver address is a unicast address ("individual RA"). If
* bcrx_sta_key parameter is set, station specific key is used
* even with broad/multicast targets (this is against IEEE
* 802.11, but makes it easier to use different keys with
* stations that do not support WEP key mapping). */
if (!(hdr->addr1[0] & 0x01) || local->bcrx_sta_key)
(void)hostap_handle_sta_crypto(local, hdr, &crypt,
&sta);
#endif
/* allow NULL decrypt to indicate an station specific override
* for default encryption */
if (crypt && (crypt->ops == NULL ||
crypt->ops->decrypt_mpdu == NULL))
crypt = NULL;
if (!crypt && (fc & IEEE80211_FCTL_PROTECTED)) {
/* This seems to be triggered by some (multicast?)
* frames from other than current BSS, so just drop the
* frames silently instead of filling system log with
* these reports. */
IEEE80211_DEBUG_DROP("Decryption failed (not set)"
" (SA=" MAC_FMT ")\n",
hdr->addr2[0], hdr->addr2[1],
hdr->addr2[2], hdr->addr2[3],
hdr->addr2[4], hdr->addr2[5]);
ieee->ieee_stats.rx_discards_undecryptable++;
goto rx_dropped;
}
}
#ifdef NOT_YET
if (type != WLAN_FC_TYPE_DATA) {
if (type == WLAN_FC_TYPE_MGMT && stype == WLAN_FC_STYPE_AUTH &&
fc & IEEE80211_FCTL_PROTECTED && ieee->host_decrypt &&
(keyidx = hostap_rx_frame_decrypt(ieee, skb, crypt)) < 0) {
printk(KERN_DEBUG "%s: failed to decrypt mgmt::auth "
"from " MAC_FMT "\n", dev->name,
hdr->addr2[0], hdr->addr2[1],
hdr->addr2[2], hdr->addr2[3],
hdr->addr2[4], hdr->addr2[5]);
/* TODO: could inform hostapd about this so that it
* could send auth failure report */
goto rx_dropped;
}
if (ieee80211_rx_frame_mgmt(ieee, skb, rx_stats, type, stype))
goto rx_dropped;
else
goto rx_exit;
}
#endif
/* drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.29) */
if (sc == ieee->prev_seq_ctl)
goto rx_dropped;
else
ieee->prev_seq_ctl = sc;
/* Data frame - extract src/dst addresses */
if (skb->len < IEEE80211_3ADDR_LEN)
goto rx_dropped;
switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) {
case IEEE80211_FCTL_FROMDS:
memcpy(dst, hdr->addr1, ETH_ALEN);
memcpy(src, hdr->addr3, ETH_ALEN);
break;
case IEEE80211_FCTL_TODS:
memcpy(dst, hdr->addr3, ETH_ALEN);
memcpy(src, hdr->addr2, ETH_ALEN);
break;
case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS:
if (skb->len < IEEE80211_4ADDR_LEN)
goto rx_dropped;
memcpy(dst, hdr->addr3, ETH_ALEN);
memcpy(src, hdr->addr4, ETH_ALEN);
break;
case 0:
memcpy(dst, hdr->addr1, ETH_ALEN);
memcpy(src, hdr->addr2, ETH_ALEN);
break;
}
#ifdef NOT_YET
if (hostap_rx_frame_wds(ieee, hdr, fc, &wds))
goto rx_dropped;
if (wds) {
skb->dev = dev = wds;
stats = hostap_get_stats(dev);
}
if (ieee->iw_mode == IW_MODE_MASTER && !wds &&
(fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
IEEE80211_FCTL_FROMDS && ieee->stadev
&& !compare_ether_addr(hdr->addr2, ieee->assoc_ap_addr)) {
/* Frame from BSSID of the AP for which we are a client */
skb->dev = dev = ieee->stadev;
stats = hostap_get_stats(dev);
from_assoc_ap = 1;
}
#endif
dev->last_rx = jiffies;
#ifdef NOT_YET
if ((ieee->iw_mode == IW_MODE_MASTER ||
ieee->iw_mode == IW_MODE_REPEAT) && !from_assoc_ap) {
switch (hostap_handle_sta_rx(ieee, dev, skb, rx_stats,
wds != NULL)) {
case AP_RX_CONTINUE_NOT_AUTHORIZED:
frame_authorized = 0;
break;
case AP_RX_CONTINUE:
frame_authorized = 1;
break;
case AP_RX_DROP:
goto rx_dropped;
case AP_RX_EXIT:
goto rx_exit;
}
}
#endif
/* Nullfunc frames may have PS-bit set, so they must be passed to
* hostap_handle_sta_rx() before being dropped here. */
stype &= ~IEEE80211_STYPE_QOS_DATA;
if (stype != IEEE80211_STYPE_DATA &&
stype != IEEE80211_STYPE_DATA_CFACK &&
stype != IEEE80211_STYPE_DATA_CFPOLL &&
stype != IEEE80211_STYPE_DATA_CFACKPOLL) {
if (stype != IEEE80211_STYPE_NULLFUNC)
IEEE80211_DEBUG_DROP("RX: dropped data frame "
"with no data (type=0x%02x, "
"subtype=0x%02x, len=%d)\n",
type, stype, skb->len);
goto rx_dropped;
}
/* skb: hdr + (possibly fragmented, possibly encrypted) payload */
if ((fc & IEEE80211_FCTL_PROTECTED) && can_be_decrypted &&
(keyidx = ieee80211_rx_frame_decrypt(ieee, skb, crypt)) < 0)
goto rx_dropped;
hdr = (struct ieee80211_hdr_4addr *)skb->data;
/* skb: hdr + (possibly fragmented) plaintext payload */
// PR: FIXME: hostap has additional conditions in the "if" below:
// ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
if ((frag != 0) || (fc & IEEE80211_FCTL_MOREFRAGS)) {
int flen;
struct sk_buff *frag_skb = ieee80211_frag_cache_get(ieee, hdr);
IEEE80211_DEBUG_FRAG("Rx Fragment received (%u)\n", frag);
if (!frag_skb) {
IEEE80211_DEBUG(IEEE80211_DL_RX | IEEE80211_DL_FRAG,
"Rx cannot get skb from fragment "
"cache (morefrag=%d seq=%u frag=%u)\n",
(fc & IEEE80211_FCTL_MOREFRAGS) != 0,
WLAN_GET_SEQ_SEQ(sc), frag);
goto rx_dropped;
}
flen = skb->len;
if (frag != 0)
flen -= hdrlen;
if (frag_skb->tail + flen > frag_skb->end) {
printk(KERN_WARNING "%s: host decrypted and "
"reassembled frame did not fit skb\n",
dev->name);
ieee80211_frag_cache_invalidate(ieee, hdr);
goto rx_dropped;
}
if (frag == 0) {
/* copy first fragment (including full headers) into
* beginning of the fragment cache skb */
skb_copy_from_linear_data(skb, skb_put(frag_skb, flen), flen);
} else {
/* append frame payload to the end of the fragment
* cache skb */
skb_copy_from_linear_data_offset(skb, hdrlen,
skb_put(frag_skb, flen), flen);
}
dev_kfree_skb_any(skb);
skb = NULL;
if (fc & IEEE80211_FCTL_MOREFRAGS) {
/* more fragments expected - leave the skb in fragment
* cache for now; it will be delivered to upper layers
* after all fragments have been received */
goto rx_exit;
}
/* this was the last fragment and the frame will be
* delivered, so remove skb from fragment cache */
skb = frag_skb;
hdr = (struct ieee80211_hdr_4addr *)skb->data;
ieee80211_frag_cache_invalidate(ieee, hdr);
}
/* skb: hdr + (possible reassembled) full MSDU payload; possibly still
* encrypted/authenticated */
if ((fc & IEEE80211_FCTL_PROTECTED) && can_be_decrypted &&
ieee80211_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt))
goto rx_dropped;
hdr = (struct ieee80211_hdr_4addr *)skb->data;
if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep) {
if ( /*ieee->ieee802_1x && */
ieee80211_is_eapol_frame(ieee, skb)) {
/* pass unencrypted EAPOL frames even if encryption is
* configured */
} else {
IEEE80211_DEBUG_DROP("encryption configured, but RX "
"frame not encrypted (SA="
MAC_FMT ")\n",
hdr->addr2[0], hdr->addr2[1],
hdr->addr2[2], hdr->addr2[3],
hdr->addr2[4], hdr->addr2[5]);
goto rx_dropped;
}
}
if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep &&
!ieee80211_is_eapol_frame(ieee, skb)) {
IEEE80211_DEBUG_DROP("dropped unencrypted RX data "
"frame from " MAC_FMT
" (drop_unencrypted=1)\n",
hdr->addr2[0], hdr->addr2[1],
hdr->addr2[2], hdr->addr2[3],
hdr->addr2[4], hdr->addr2[5]);
goto rx_dropped;
}
/* If the frame was decrypted in hardware, we may need to strip off
* any security data (IV, ICV, etc) that was left behind */
if (!can_be_decrypted && (fc & IEEE80211_FCTL_PROTECTED) &&
ieee->host_strip_iv_icv) {
int trimlen = 0;
/* Top two-bits of byte 3 are the key index */
if (skb->len >= hdrlen + 3)
keyidx = skb->data[hdrlen + 3] >> 6;
/* To strip off any security data which appears before the
* payload, we simply increase hdrlen (as the header gets
* chopped off immediately below). For the security data which
* appears after the payload, we use skb_trim. */
switch (ieee->sec.encode_alg[keyidx]) {
case SEC_ALG_WEP:
/* 4 byte IV */
hdrlen += 4;
/* 4 byte ICV */
trimlen = 4;
break;
case SEC_ALG_TKIP:
/* 4 byte IV, 4 byte ExtIV */
hdrlen += 8;
/* 8 byte MIC, 4 byte ICV */
trimlen = 12;
break;
case SEC_ALG_CCMP:
/* 8 byte CCMP header */
hdrlen += 8;
/* 8 byte MIC */
trimlen = 8;
break;
}
if (skb->len < trimlen)
goto rx_dropped;
__skb_trim(skb, skb->len - trimlen);
if (skb->len < hdrlen)
goto rx_dropped;
}
/* skb: hdr + (possible reassembled) full plaintext payload */
payload = skb->data + hdrlen;
ethertype = (payload[6] << 8) | payload[7];
#ifdef NOT_YET
/* If IEEE 802.1X is used, check whether the port is authorized to send
* the received frame. */
if (ieee->ieee802_1x && ieee->iw_mode == IW_MODE_MASTER) {
if (ethertype == ETH_P_PAE) {
printk(KERN_DEBUG "%s: RX: IEEE 802.1X frame\n",
dev->name);
if (ieee->hostapd && ieee->apdev) {
/* Send IEEE 802.1X frames to the user
* space daemon for processing */
prism2_rx_80211(ieee->apdev, skb, rx_stats,
PRISM2_RX_MGMT);
ieee->apdevstats.rx_packets++;
ieee->apdevstats.rx_bytes += skb->len;
goto rx_exit;
}
} else if (!frame_authorized) {
printk(KERN_DEBUG "%s: dropped frame from "
"unauthorized port (IEEE 802.1X): "
"ethertype=0x%04x\n", dev->name, ethertype);
goto rx_dropped;
}
}
#endif
/* convert hdr + possible LLC headers into Ethernet header */
if (skb->len - hdrlen >= 8 &&
((memcmp(payload, rfc1042_header, SNAP_SIZE) == 0 &&
ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
memcmp(payload, bridge_tunnel_header, SNAP_SIZE) == 0)) {
/* remove RFC1042 or Bridge-Tunnel encapsulation and
* replace EtherType */
skb_pull(skb, hdrlen + SNAP_SIZE);
memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
} else {
__be16 len;
/* Leave Ethernet header part of hdr and full payload */
skb_pull(skb, hdrlen);
len = htons(skb->len);
memcpy(skb_push(skb, 2), &len, 2);
memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
}
#ifdef NOT_YET
if (wds && ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
IEEE80211_FCTL_TODS) && skb->len >= ETH_HLEN + ETH_ALEN) {
/* Non-standard frame: get addr4 from its bogus location after
* the payload */
skb_copy_to_linear_data_offset(skb, ETH_ALEN,
skb->data + skb->len - ETH_ALEN,
ETH_ALEN);
skb_trim(skb, skb->len - ETH_ALEN);
}
#endif
stats->rx_packets++;
stats->rx_bytes += skb->len;
#ifdef NOT_YET
if (ieee->iw_mode == IW_MODE_MASTER && !wds && ieee->ap->bridge_packets) {
if (dst[0] & 0x01) {
/* copy multicast frame both to the higher layers and
* to the wireless media */
ieee->ap->bridged_multicast++;
skb2 = skb_clone(skb, GFP_ATOMIC);
if (skb2 == NULL)
printk(KERN_DEBUG "%s: skb_clone failed for "
"multicast frame\n", dev->name);
} else if (hostap_is_sta_assoc(ieee->ap, dst)) {
/* send frame directly to the associated STA using
* wireless media and not passing to higher layers */
ieee->ap->bridged_unicast++;
skb2 = skb;
skb = NULL;
}
}
if (skb2 != NULL) {
/* send to wireless media */
skb2->dev = dev;
skb2->protocol = htons(ETH_P_802_3);
skb_reset_mac_header(skb2);
skb_reset_network_header(skb2);
/* skb2->network_header += ETH_HLEN; */
dev_queue_xmit(skb2);
}
#endif
if (skb) {
skb->protocol = eth_type_trans(skb, dev);
memset(skb->cb, 0, sizeof(skb->cb));
skb->ip_summed = CHECKSUM_NONE; /* 802.11 crc not sufficient */
if (netif_rx(skb) == NET_RX_DROP) {
/* netif_rx always succeeds, but it might drop
* the packet. If it drops the packet, we log that
* in our stats. */
IEEE80211_DEBUG_DROP
("RX: netif_rx dropped the packet\n");
stats->rx_dropped++;
}
}
rx_exit:
#ifdef NOT_YET
if (sta)
hostap_handle_sta_release(sta);
#endif
return 1;
rx_dropped:
stats->rx_dropped++;
/* Returning 0 indicates to caller that we have not handled the SKB--
* so it is still allocated and can be used again by underlying
* hardware as a DMA target */
return 0;
}
/* Filter out unrelated packets, call ieee80211_rx[_mgt]
* This function takes over the skb, it should not be used again after calling
* this function. */
void ieee80211_rx_any(struct ieee80211_device *ieee,
struct sk_buff *skb, struct ieee80211_rx_stats *stats)
{
struct ieee80211_hdr_4addr *hdr;
int is_packet_for_us;
u16 fc;
if (ieee->iw_mode == IW_MODE_MONITOR) {
if (!ieee80211_rx(ieee, skb, stats))
dev_kfree_skb_irq(skb);
return;
}
if (skb->len < sizeof(struct ieee80211_hdr))
goto drop_free;
hdr = (struct ieee80211_hdr_4addr *)skb->data;
fc = le16_to_cpu(hdr->frame_ctl);
if ((fc & IEEE80211_FCTL_VERS) != 0)
goto drop_free;
switch (fc & IEEE80211_FCTL_FTYPE) {
case IEEE80211_FTYPE_MGMT:
if (skb->len < sizeof(struct ieee80211_hdr_3addr))
goto drop_free;
ieee80211_rx_mgt(ieee, hdr, stats);
dev_kfree_skb_irq(skb);
return;
case IEEE80211_FTYPE_DATA:
break;
case IEEE80211_FTYPE_CTL:
return;
default:
return;
}
is_packet_for_us = 0;
switch (ieee->iw_mode) {
case IW_MODE_ADHOC:
/* our BSS and not from/to DS */
if (memcmp(hdr->addr3, ieee->bssid, ETH_ALEN) == 0)
if ((fc & (IEEE80211_FCTL_TODS+IEEE80211_FCTL_FROMDS)) == 0) {
/* promisc: get all */
if (ieee->dev->flags & IFF_PROMISC)
is_packet_for_us = 1;
/* to us */
else if (memcmp(hdr->addr1, ieee->dev->dev_addr, ETH_ALEN) == 0)
is_packet_for_us = 1;
/* mcast */
else if (is_multicast_ether_addr(hdr->addr1))
is_packet_for_us = 1;
}
break;
case IW_MODE_INFRA:
/* our BSS (== from our AP) and from DS */
if (memcmp(hdr->addr2, ieee->bssid, ETH_ALEN) == 0)
if ((fc & (IEEE80211_FCTL_TODS+IEEE80211_FCTL_FROMDS)) == IEEE80211_FCTL_FROMDS) {
/* promisc: get all */
if (ieee->dev->flags & IFF_PROMISC)
is_packet_for_us = 1;
/* to us */
else if (memcmp(hdr->addr1, ieee->dev->dev_addr, ETH_ALEN) == 0)
is_packet_for_us = 1;
/* mcast */
else if (is_multicast_ether_addr(hdr->addr1)) {
/* not our own packet bcasted from AP */
if (memcmp(hdr->addr3, ieee->dev->dev_addr, ETH_ALEN))
is_packet_for_us = 1;
}
}
break;
default:
/* ? */
break;
}
if (is_packet_for_us)
if (!ieee80211_rx(ieee, skb, stats))
dev_kfree_skb_irq(skb);
return;
drop_free:
dev_kfree_skb_irq(skb);
ieee->stats.rx_dropped++;
return;
}
#define MGMT_FRAME_FIXED_PART_LENGTH 0x24
static u8 qos_oui[QOS_OUI_LEN] = { 0x00, 0x50, 0xF2 };
/*
* Make ther structure we read from the beacon packet has
* the right values
*/
static int ieee80211_verify_qos_info(struct ieee80211_qos_information_element
*info_element, int sub_type)
{
if (info_element->qui_subtype != sub_type)
return -1;
if (memcmp(info_element->qui, qos_oui, QOS_OUI_LEN))
return -1;
if (info_element->qui_type != QOS_OUI_TYPE)
return -1;
if (info_element->version != QOS_VERSION_1)
return -1;
return 0;
}
/*
* Parse a QoS parameter element
*/
static int ieee80211_read_qos_param_element(struct ieee80211_qos_parameter_info
*element_param, struct ieee80211_info_element
*info_element)
{
int ret = 0;
u16 size = sizeof(struct ieee80211_qos_parameter_info) - 2;
if ((info_element == NULL) || (element_param == NULL))
return -1;
if (info_element->id == QOS_ELEMENT_ID && info_element->len == size) {
memcpy(element_param->info_element.qui, info_element->data,
info_element->len);
element_param->info_element.elementID = info_element->id;
element_param->info_element.length = info_element->len;
} else
ret = -1;
if (ret == 0)
ret = ieee80211_verify_qos_info(&element_param->info_element,
QOS_OUI_PARAM_SUB_TYPE);
return ret;
}
/*
* Parse a QoS information element
*/
static int ieee80211_read_qos_info_element(struct
ieee80211_qos_information_element
*element_info, struct ieee80211_info_element
*info_element)
{
int ret = 0;
u16 size = sizeof(struct ieee80211_qos_information_element) - 2;
if (element_info == NULL)
return -1;
if (info_element == NULL)
return -1;
if ((info_element->id == QOS_ELEMENT_ID) && (info_element->len == size)) {
memcpy(element_info->qui, info_element->data,
info_element->len);
element_info->elementID = info_element->id;
element_info->length = info_element->len;
} else
ret = -1;
if (ret == 0)
ret = ieee80211_verify_qos_info(element_info,
QOS_OUI_INFO_SUB_TYPE);
return ret;
}
/*
* Write QoS parameters from the ac parameters.
*/
static int ieee80211_qos_convert_ac_to_parameters(struct
ieee80211_qos_parameter_info
*param_elm, struct
ieee80211_qos_parameters
*qos_param)
{
int rc = 0;
int i;
struct ieee80211_qos_ac_parameter *ac_params;
u32 txop;
u8 cw_min;
u8 cw_max;
for (i = 0; i < QOS_QUEUE_NUM; i++) {
ac_params = &(param_elm->ac_params_record[i]);
qos_param->aifs[i] = (ac_params->aci_aifsn) & 0x0F;
qos_param->aifs[i] -= (qos_param->aifs[i] < 2) ? 0 : 2;
cw_min = ac_params->ecw_min_max & 0x0F;
qos_param->cw_min[i] = cpu_to_le16((1 << cw_min) - 1);
cw_max = (ac_params->ecw_min_max & 0xF0) >> 4;
qos_param->cw_max[i] = cpu_to_le16((1 << cw_max) - 1);
qos_param->flag[i] =
(ac_params->aci_aifsn & 0x10) ? 0x01 : 0x00;
txop = le16_to_cpu(ac_params->tx_op_limit) * 32;
qos_param->tx_op_limit[i] = cpu_to_le16(txop);
}
return rc;
}
/*
* we have a generic data element which it may contain QoS information or
* parameters element. check the information element length to decide
* which type to read
*/
static int ieee80211_parse_qos_info_param_IE(struct ieee80211_info_element
*info_element,
struct ieee80211_network *network)
{
int rc = 0;
struct ieee80211_qos_parameters *qos_param = NULL;
struct ieee80211_qos_information_element qos_info_element;
rc = ieee80211_read_qos_info_element(&qos_info_element, info_element);
if (rc == 0) {
network->qos_data.param_count = qos_info_element.ac_info & 0x0F;
network->flags |= NETWORK_HAS_QOS_INFORMATION;
} else {
struct ieee80211_qos_parameter_info param_element;
rc = ieee80211_read_qos_param_element(&param_element,
info_element);
if (rc == 0) {
qos_param = &(network->qos_data.parameters);
ieee80211_qos_convert_ac_to_parameters(&param_element,
qos_param);
network->flags |= NETWORK_HAS_QOS_PARAMETERS;
network->qos_data.param_count =
param_element.info_element.ac_info & 0x0F;
}
}
if (rc == 0) {
IEEE80211_DEBUG_QOS("QoS is supported\n");
network->qos_data.supported = 1;
}
return rc;
}
#ifdef CONFIG_IEEE80211_DEBUG
#define MFIE_STRING(x) case MFIE_TYPE_ ##x: return #x
static const char *get_info_element_string(u16 id)
{
switch (id) {
MFIE_STRING(SSID);
MFIE_STRING(RATES);
MFIE_STRING(FH_SET);
MFIE_STRING(DS_SET);
MFIE_STRING(CF_SET);
MFIE_STRING(TIM);
MFIE_STRING(IBSS_SET);
MFIE_STRING(COUNTRY);
MFIE_STRING(HOP_PARAMS);
MFIE_STRING(HOP_TABLE);
MFIE_STRING(REQUEST);
MFIE_STRING(CHALLENGE);
MFIE_STRING(POWER_CONSTRAINT);
MFIE_STRING(POWER_CAPABILITY);
MFIE_STRING(TPC_REQUEST);
MFIE_STRING(TPC_REPORT);
MFIE_STRING(SUPP_CHANNELS);
MFIE_STRING(CSA);
MFIE_STRING(MEASURE_REQUEST);
MFIE_STRING(MEASURE_REPORT);
MFIE_STRING(QUIET);
MFIE_STRING(IBSS_DFS);
MFIE_STRING(ERP_INFO);
MFIE_STRING(RSN);
MFIE_STRING(RATES_EX);
MFIE_STRING(GENERIC);
MFIE_STRING(QOS_PARAMETER);
default:
return "UNKNOWN";
}
}
#endif
static int ieee80211_parse_info_param(struct ieee80211_info_element
*info_element, u16 length,
struct ieee80211_network *network)
{
u8 i;
#ifdef CONFIG_IEEE80211_DEBUG
char rates_str[64];
char *p;
#endif
while (length >= sizeof(*info_element)) {
if (sizeof(*info_element) + info_element->len > length) {
IEEE80211_DEBUG_MGMT("Info elem: parse failed: "
"info_element->len + 2 > left : "
"info_element->len+2=%zd left=%d, id=%d.\n",
info_element->len +
sizeof(*info_element),
length, info_element->id);
/* We stop processing but don't return an error here
* because some misbehaviour APs break this rule. ie.
* Orinoco AP1000. */
break;
}
switch (info_element->id) {
case MFIE_TYPE_SSID:
if (ieee80211_is_empty_essid(info_element->data,
info_element->len)) {
network->flags |= NETWORK_EMPTY_ESSID;
break;
}
network->ssid_len = min(info_element->len,
(u8) IW_ESSID_MAX_SIZE);
memcpy(network->ssid, info_element->data,
network->ssid_len);
if (network->ssid_len < IW_ESSID_MAX_SIZE)
memset(network->ssid + network->ssid_len, 0,
IW_ESSID_MAX_SIZE - network->ssid_len);
IEEE80211_DEBUG_MGMT("MFIE_TYPE_SSID: '%s' len=%d.\n",
network->ssid, network->ssid_len);
break;
case MFIE_TYPE_RATES:
#ifdef CONFIG_IEEE80211_DEBUG
p = rates_str;
#endif
network->rates_len = min(info_element->len,
MAX_RATES_LENGTH);
for (i = 0; i < network->rates_len; i++) {
network->rates[i] = info_element->data[i];
#ifdef CONFIG_IEEE80211_DEBUG
p += snprintf(p, sizeof(rates_str) -
(p - rates_str), "%02X ",
network->rates[i]);
#endif
if (ieee80211_is_ofdm_rate
(info_element->data[i])) {
network->flags |= NETWORK_HAS_OFDM;
if (info_element->data[i] &
IEEE80211_BASIC_RATE_MASK)
network->flags &=
~NETWORK_HAS_CCK;
}
}
IEEE80211_DEBUG_MGMT("MFIE_TYPE_RATES: '%s' (%d)\n",
rates_str, network->rates_len);
break;
case MFIE_TYPE_RATES_EX:
#ifdef CONFIG_IEEE80211_DEBUG
p = rates_str;
#endif
network->rates_ex_len = min(info_element->len,
MAX_RATES_EX_LENGTH);
for (i = 0; i < network->rates_ex_len; i++) {
network->rates_ex[i] = info_element->data[i];
#ifdef CONFIG_IEEE80211_DEBUG
p += snprintf(p, sizeof(rates_str) -
(p - rates_str), "%02X ",
network->rates[i]);
#endif
if (ieee80211_is_ofdm_rate
(info_element->data[i])) {
network->flags |= NETWORK_HAS_OFDM;
if (info_element->data[i] &
IEEE80211_BASIC_RATE_MASK)
network->flags &=
~NETWORK_HAS_CCK;
}
}
IEEE80211_DEBUG_MGMT("MFIE_TYPE_RATES_EX: '%s' (%d)\n",
rates_str, network->rates_ex_len);
break;
case MFIE_TYPE_DS_SET:
IEEE80211_DEBUG_MGMT("MFIE_TYPE_DS_SET: %d\n",
info_element->data[0]);
network->channel = info_element->data[0];
break;
case MFIE_TYPE_FH_SET:
IEEE80211_DEBUG_MGMT("MFIE_TYPE_FH_SET: ignored\n");
break;
case MFIE_TYPE_CF_SET:
IEEE80211_DEBUG_MGMT("MFIE_TYPE_CF_SET: ignored\n");
break;
case MFIE_TYPE_TIM:
network->tim.tim_count = info_element->data[0];
network->tim.tim_period = info_element->data[1];
IEEE80211_DEBUG_MGMT("MFIE_TYPE_TIM: partially ignored\n");
break;
case MFIE_TYPE_ERP_INFO:
network->erp_value = info_element->data[0];
network->flags |= NETWORK_HAS_ERP_VALUE;
IEEE80211_DEBUG_MGMT("MFIE_TYPE_ERP_SET: %d\n",
network->erp_value);
break;
case MFIE_TYPE_IBSS_SET:
network->atim_window = info_element->data[0];
IEEE80211_DEBUG_MGMT("MFIE_TYPE_IBSS_SET: %d\n",
network->atim_window);
break;
case MFIE_TYPE_CHALLENGE:
IEEE80211_DEBUG_MGMT("MFIE_TYPE_CHALLENGE: ignored\n");
break;
case MFIE_TYPE_GENERIC:
IEEE80211_DEBUG_MGMT("MFIE_TYPE_GENERIC: %d bytes\n",
info_element->len);
if (!ieee80211_parse_qos_info_param_IE(info_element,
network))
break;
if (info_element->len >= 4 &&
info_element->data[0] == 0x00 &&
info_element->data[1] == 0x50 &&
info_element->data[2] == 0xf2 &&
info_element->data[3] == 0x01) {
network->wpa_ie_len = min(info_element->len + 2,
MAX_WPA_IE_LEN);
memcpy(network->wpa_ie, info_element,
network->wpa_ie_len);
}
break;
case MFIE_TYPE_RSN:
IEEE80211_DEBUG_MGMT("MFIE_TYPE_RSN: %d bytes\n",
info_element->len);
network->rsn_ie_len = min(info_element->len + 2,
MAX_WPA_IE_LEN);
memcpy(network->rsn_ie, info_element,
network->rsn_ie_len);
break;
case MFIE_TYPE_QOS_PARAMETER:
printk(KERN_ERR
"QoS Error need to parse QOS_PARAMETER IE\n");
break;
/* 802.11h */
case MFIE_TYPE_POWER_CONSTRAINT:
network->power_constraint = info_element->data[0];
network->flags |= NETWORK_HAS_POWER_CONSTRAINT;
break;
case MFIE_TYPE_CSA:
network->power_constraint = info_element->data[0];
network->flags |= NETWORK_HAS_CSA;
break;
case MFIE_TYPE_QUIET:
network->quiet.count = info_element->data[0];
network->quiet.period = info_element->data[1];
network->quiet.duration = info_element->data[2];
network->quiet.offset = info_element->data[3];
network->flags |= NETWORK_HAS_QUIET;
break;
case MFIE_TYPE_IBSS_DFS:
if (network->ibss_dfs)
break;
network->ibss_dfs = kmemdup(info_element->data,
info_element->len,
GFP_ATOMIC);
if (!network->ibss_dfs)
return 1;
network->flags |= NETWORK_HAS_IBSS_DFS;
break;
case MFIE_TYPE_TPC_REPORT:
network->tpc_report.transmit_power =
info_element->data[0];
network->tpc_report.link_margin = info_element->data[1];
network->flags |= NETWORK_HAS_TPC_REPORT;
break;
default:
IEEE80211_DEBUG_MGMT
("Unsupported info element: %s (%d)\n",
get_info_element_string(info_element->id),
info_element->id);
break;
}
length -= sizeof(*info_element) + info_element->len;
info_element =
(struct ieee80211_info_element *)&info_element->
data[info_element->len];
}
return 0;
}
static int ieee80211_handle_assoc_resp(struct ieee80211_device *ieee, struct ieee80211_assoc_response
*frame, struct ieee80211_rx_stats *stats)
{
struct ieee80211_network network_resp = {
.ibss_dfs = NULL,
};
struct ieee80211_network *network = &network_resp;
struct net_device *dev = ieee->dev;
network->flags = 0;
network->qos_data.active = 0;
network->qos_data.supported = 0;
network->qos_data.param_count = 0;
network->qos_data.old_param_count = 0;
//network->atim_window = le16_to_cpu(frame->aid) & (0x3FFF);
network->atim_window = le16_to_cpu(frame->aid);
network->listen_interval = le16_to_cpu(frame->status);
memcpy(network->bssid, frame->header.addr3, ETH_ALEN);
network->capability = le16_to_cpu(frame->capability);
network->last_scanned = jiffies;
network->rates_len = network->rates_ex_len = 0;
network->last_associate = 0;
network->ssid_len = 0;
network->erp_value =
(network->capability & WLAN_CAPABILITY_IBSS) ? 0x3 : 0x0;
if (stats->freq == IEEE80211_52GHZ_BAND) {
/* for A band (No DS info) */
network->channel = stats->received_channel;
} else
network->flags |= NETWORK_HAS_CCK;
network->wpa_ie_len = 0;
network->rsn_ie_len = 0;
if (ieee80211_parse_info_param
(frame->info_element, stats->len - sizeof(*frame), network))
return 1;
network->mode = 0;
if (stats->freq == IEEE80211_52GHZ_BAND)
network->mode = IEEE_A;
else {
if (network->flags & NETWORK_HAS_OFDM)
network->mode |= IEEE_G;
if (network->flags & NETWORK_HAS_CCK)
network->mode |= IEEE_B;
}
if (ieee80211_is_empty_essid(network->ssid, network->ssid_len))
network->flags |= NETWORK_EMPTY_ESSID;
memcpy(&network->stats, stats, sizeof(network->stats));
if (ieee->handle_assoc_response != NULL)
ieee->handle_assoc_response(dev, frame, network);
return 0;
}
/***************************************************/
static int ieee80211_network_init(struct ieee80211_device *ieee, struct ieee80211_probe_response
*beacon,
struct ieee80211_network *network,
struct ieee80211_rx_stats *stats)
{
DECLARE_MAC_BUF(mac);
network->qos_data.active = 0;
network->qos_data.supported = 0;
network->qos_data.param_count = 0;
network->qos_data.old_param_count = 0;
/* Pull out fixed field data */
memcpy(network->bssid, beacon->header.addr3, ETH_ALEN);
network->capability = le16_to_cpu(beacon->capability);
network->last_scanned = jiffies;
network->time_stamp[0] = le32_to_cpu(beacon->time_stamp[0]);
network->time_stamp[1] = le32_to_cpu(beacon->time_stamp[1]);
network->beacon_interval = le16_to_cpu(beacon->beacon_interval);
/* Where to pull this? beacon->listen_interval; */
network->listen_interval = 0x0A;
network->rates_len = network->rates_ex_len = 0;
network->last_associate = 0;
network->ssid_len = 0;
network->flags = 0;
network->atim_window = 0;
network->erp_value = (network->capability & WLAN_CAPABILITY_IBSS) ?
0x3 : 0x0;
if (stats->freq == IEEE80211_52GHZ_BAND) {
/* for A band (No DS info) */
network->channel = stats->received_channel;
} else
network->flags |= NETWORK_HAS_CCK;
network->wpa_ie_len = 0;
network->rsn_ie_len = 0;
if (ieee80211_parse_info_param
(beacon->info_element, stats->len - sizeof(*beacon), network))
return 1;
network->mode = 0;
if (stats->freq == IEEE80211_52GHZ_BAND)
network->mode = IEEE_A;
else {
if (network->flags & NETWORK_HAS_OFDM)
network->mode |= IEEE_G;
if (network->flags & NETWORK_HAS_CCK)
network->mode |= IEEE_B;
}
if (network->mode == 0) {
IEEE80211_DEBUG_SCAN("Filtered out '%s (%s)' "
"network.\n",
escape_essid(network->ssid,
network->ssid_len),
print_mac(mac, network->bssid));
return 1;
}
if (ieee80211_is_empty_essid(network->ssid, network->ssid_len))
network->flags |= NETWORK_EMPTY_ESSID;
memcpy(&network->stats, stats, sizeof(network->stats));
return 0;
}
static inline int is_same_network(struct ieee80211_network *src,
struct ieee80211_network *dst)
{
/* A network is only a duplicate if the channel, BSSID, and ESSID
* all match. We treat all <hidden> with the same BSSID and channel
* as one network */
return ((src->ssid_len == dst->ssid_len) &&
(src->channel == dst->channel) &&
!compare_ether_addr(src->bssid, dst->bssid) &&
!memcmp(src->ssid, dst->ssid, src->ssid_len));
}
static void update_network(struct ieee80211_network *dst,
struct ieee80211_network *src)
{
int qos_active;
u8 old_param;
DECLARE_MAC_BUF(mac);
ieee80211_network_reset(dst);
dst->ibss_dfs = src->ibss_dfs;
/* We only update the statistics if they were created by receiving
* the network information on the actual channel the network is on.
*
* This keeps beacons received on neighbor channels from bringing
* down the signal level of an AP. */
if (dst->channel == src->stats.received_channel)
memcpy(&dst->stats, &src->stats,
sizeof(struct ieee80211_rx_stats));
else
IEEE80211_DEBUG_SCAN("Network %s info received "
"off channel (%d vs. %d)\n", print_mac(mac, src->bssid),
dst->channel, src->stats.received_channel);
dst->capability = src->capability;
memcpy(dst->rates, src->rates, src->rates_len);
dst->rates_len = src->rates_len;
memcpy(dst->rates_ex, src->rates_ex, src->rates_ex_len);
dst->rates_ex_len = src->rates_ex_len;
dst->mode = src->mode;
dst->flags = src->flags;
dst->time_stamp[0] = src->time_stamp[0];
dst->time_stamp[1] = src->time_stamp[1];
dst->beacon_interval = src->beacon_interval;
dst->listen_interval = src->listen_interval;
dst->atim_window = src->atim_window;
dst->erp_value = src->erp_value;
dst->tim = src->tim;
memcpy(dst->wpa_ie, src->wpa_ie, src->wpa_ie_len);
dst->wpa_ie_len = src->wpa_ie_len;
memcpy(dst->rsn_ie, src->rsn_ie, src->rsn_ie_len);
dst->rsn_ie_len = src->rsn_ie_len;
dst->last_scanned = jiffies;
qos_active = src->qos_data.active;
old_param = dst->qos_data.old_param_count;
if (dst->flags & NETWORK_HAS_QOS_MASK)
memcpy(&dst->qos_data, &src->qos_data,
sizeof(struct ieee80211_qos_data));
else {
dst->qos_data.supported = src->qos_data.supported;
dst->qos_data.param_count = src->qos_data.param_count;
}
if (dst->qos_data.supported == 1) {
if (dst->ssid_len)
IEEE80211_DEBUG_QOS
("QoS the network %s is QoS supported\n",
dst->ssid);
else
IEEE80211_DEBUG_QOS
("QoS the network is QoS supported\n");
}
dst->qos_data.active = qos_active;
dst->qos_data.old_param_count = old_param;
/* dst->last_associate is not overwritten */
}
static inline int is_beacon(__le16 fc)
{
return (WLAN_FC_GET_STYPE(le16_to_cpu(fc)) == IEEE80211_STYPE_BEACON);
}
static void ieee80211_process_probe_response(struct ieee80211_device
*ieee, struct
ieee80211_probe_response
*beacon, struct ieee80211_rx_stats
*stats)
{
struct net_device *dev = ieee->dev;
struct ieee80211_network network = {
.ibss_dfs = NULL,
};
struct ieee80211_network *target;
struct ieee80211_network *oldest = NULL;
#ifdef CONFIG_IEEE80211_DEBUG
struct ieee80211_info_element *info_element = beacon->info_element;
#endif
unsigned long flags;
DECLARE_MAC_BUF(mac);
IEEE80211_DEBUG_SCAN("'%s' (%s"
"): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n",
escape_essid(info_element->data, info_element->len),
print_mac(mac, beacon->header.addr3),
(beacon->capability & cpu_to_le16(1 << 0xf)) ? '1' : '0',
(beacon->capability & cpu_to_le16(1 << 0xe)) ? '1' : '0',
(beacon->capability & cpu_to_le16(1 << 0xd)) ? '1' : '0',
(beacon->capability & cpu_to_le16(1 << 0xc)) ? '1' : '0',
(beacon->capability & cpu_to_le16(1 << 0xb)) ? '1' : '0',
(beacon->capability & cpu_to_le16(1 << 0xa)) ? '1' : '0',
(beacon->capability & cpu_to_le16(1 << 0x9)) ? '1' : '0',
(beacon->capability & cpu_to_le16(1 << 0x8)) ? '1' : '0',
(beacon->capability & cpu_to_le16(1 << 0x7)) ? '1' : '0',
(beacon->capability & cpu_to_le16(1 << 0x6)) ? '1' : '0',
(beacon->capability & cpu_to_le16(1 << 0x5)) ? '1' : '0',
(beacon->capability & cpu_to_le16(1 << 0x4)) ? '1' : '0',
(beacon->capability & cpu_to_le16(1 << 0x3)) ? '1' : '0',
(beacon->capability & cpu_to_le16(1 << 0x2)) ? '1' : '0',
(beacon->capability & cpu_to_le16(1 << 0x1)) ? '1' : '0',
(beacon->capability & cpu_to_le16(1 << 0x0)) ? '1' : '0');
if (ieee80211_network_init(ieee, beacon, &network, stats)) {
IEEE80211_DEBUG_SCAN("Dropped '%s' (%s) via %s.\n",
escape_essid(info_element->data,
info_element->len),
print_mac(mac, beacon->header.addr3),
is_beacon(beacon->header.frame_ctl) ?
"BEACON" : "PROBE RESPONSE");
return;
}
/* The network parsed correctly -- so now we scan our known networks
* to see if we can find it in our list.
*
* NOTE: This search is definitely not optimized. Once its doing
* the "right thing" we'll optimize it for efficiency if
* necessary */
/* Search for this entry in the list and update it if it is
* already there. */
spin_lock_irqsave(&ieee->lock, flags);
list_for_each_entry(target, &ieee->network_list, list) {
if (is_same_network(target, &network))
break;
if ((oldest == NULL) ||
(target->last_scanned < oldest->last_scanned))
oldest = target;
}
/* If we didn't find a match, then get a new network slot to initialize
* with this beacon's information */
if (&target->list == &ieee->network_list) {
if (list_empty(&ieee->network_free_list)) {
/* If there are no more slots, expire the oldest */
list_del(&oldest->list);
target = oldest;
IEEE80211_DEBUG_SCAN("Expired '%s' (%s) from "
"network list.\n",
escape_essid(target->ssid,
target->ssid_len),
print_mac(mac, target->bssid));
ieee80211_network_reset(target);
} else {
/* Otherwise just pull from the free list */
target = list_entry(ieee->network_free_list.next,
struct ieee80211_network, list);
list_del(ieee->network_free_list.next);
}
#ifdef CONFIG_IEEE80211_DEBUG
IEEE80211_DEBUG_SCAN("Adding '%s' (%s) via %s.\n",
escape_essid(network.ssid,
network.ssid_len),
print_mac(mac, network.bssid),
is_beacon(beacon->header.frame_ctl) ?
"BEACON" : "PROBE RESPONSE");
#endif
memcpy(target, &network, sizeof(*target));
network.ibss_dfs = NULL;
list_add_tail(&target->list, &ieee->network_list);
} else {
IEEE80211_DEBUG_SCAN("Updating '%s' (%s) via %s.\n",
escape_essid(target->ssid,
target->ssid_len),
print_mac(mac, target->bssid),
is_beacon(beacon->header.frame_ctl) ?
"BEACON" : "PROBE RESPONSE");
update_network(target, &network);
network.ibss_dfs = NULL;
}
spin_unlock_irqrestore(&ieee->lock, flags);
if (is_beacon(beacon->header.frame_ctl)) {
if (ieee->handle_beacon != NULL)
ieee->handle_beacon(dev, beacon, target);
} else {
if (ieee->handle_probe_response != NULL)
ieee->handle_probe_response(dev, beacon, target);
}
}
void ieee80211_rx_mgt(struct ieee80211_device *ieee,
struct ieee80211_hdr_4addr *header,
struct ieee80211_rx_stats *stats)
{
switch (WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl))) {
case IEEE80211_STYPE_ASSOC_RESP:
IEEE80211_DEBUG_MGMT("received ASSOCIATION RESPONSE (%d)\n",
WLAN_FC_GET_STYPE(le16_to_cpu
(header->frame_ctl)));
ieee80211_handle_assoc_resp(ieee,
(struct ieee80211_assoc_response *)
header, stats);
break;
case IEEE80211_STYPE_REASSOC_RESP:
IEEE80211_DEBUG_MGMT("received REASSOCIATION RESPONSE (%d)\n",
WLAN_FC_GET_STYPE(le16_to_cpu
(header->frame_ctl)));
break;
case IEEE80211_STYPE_PROBE_REQ:
IEEE80211_DEBUG_MGMT("received auth (%d)\n",
WLAN_FC_GET_STYPE(le16_to_cpu
(header->frame_ctl)));
if (ieee->handle_probe_request != NULL)
ieee->handle_probe_request(ieee->dev,
(struct
ieee80211_probe_request *)
header, stats);
break;
case IEEE80211_STYPE_PROBE_RESP:
IEEE80211_DEBUG_MGMT("received PROBE RESPONSE (%d)\n",
WLAN_FC_GET_STYPE(le16_to_cpu
(header->frame_ctl)));
IEEE80211_DEBUG_SCAN("Probe response\n");
ieee80211_process_probe_response(ieee,
(struct
ieee80211_probe_response *)
header, stats);
break;
case IEEE80211_STYPE_BEACON:
IEEE80211_DEBUG_MGMT("received BEACON (%d)\n",
WLAN_FC_GET_STYPE(le16_to_cpu
(header->frame_ctl)));
IEEE80211_DEBUG_SCAN("Beacon\n");
ieee80211_process_probe_response(ieee,
(struct
ieee80211_probe_response *)
header, stats);
break;
case IEEE80211_STYPE_AUTH:
IEEE80211_DEBUG_MGMT("received auth (%d)\n",
WLAN_FC_GET_STYPE(le16_to_cpu
(header->frame_ctl)));
if (ieee->handle_auth != NULL)
ieee->handle_auth(ieee->dev,
(struct ieee80211_auth *)header);
break;
case IEEE80211_STYPE_DISASSOC:
if (ieee->handle_disassoc != NULL)
ieee->handle_disassoc(ieee->dev,
(struct ieee80211_disassoc *)
header);
break;
case IEEE80211_STYPE_ACTION:
IEEE80211_DEBUG_MGMT("ACTION\n");
if (ieee->handle_action)
ieee->handle_action(ieee->dev,
(struct ieee80211_action *)
header, stats);
break;
case IEEE80211_STYPE_REASSOC_REQ:
IEEE80211_DEBUG_MGMT("received reassoc (%d)\n",
WLAN_FC_GET_STYPE(le16_to_cpu
(header->frame_ctl)));
IEEE80211_DEBUG_MGMT("%s: IEEE80211_REASSOC_REQ received\n",
ieee->dev->name);
if (ieee->handle_reassoc_request != NULL)
ieee->handle_reassoc_request(ieee->dev,
(struct ieee80211_reassoc_request *)
header);
break;
case IEEE80211_STYPE_ASSOC_REQ:
IEEE80211_DEBUG_MGMT("received assoc (%d)\n",
WLAN_FC_GET_STYPE(le16_to_cpu
(header->frame_ctl)));
IEEE80211_DEBUG_MGMT("%s: IEEE80211_ASSOC_REQ received\n",
ieee->dev->name);
if (ieee->handle_assoc_request != NULL)
ieee->handle_assoc_request(ieee->dev);
break;
case IEEE80211_STYPE_DEAUTH:
IEEE80211_DEBUG_MGMT("DEAUTH\n");
if (ieee->handle_deauth != NULL)
ieee->handle_deauth(ieee->dev,
(struct ieee80211_deauth *)
header);
break;
default:
IEEE80211_DEBUG_MGMT("received UNKNOWN (%d)\n",
WLAN_FC_GET_STYPE(le16_to_cpu
(header->frame_ctl)));
IEEE80211_DEBUG_MGMT("%s: Unknown management packet: %d\n",
ieee->dev->name,
WLAN_FC_GET_STYPE(le16_to_cpu
(header->frame_ctl)));
break;
}
}
EXPORT_SYMBOL_GPL(ieee80211_rx_any);
EXPORT_SYMBOL(ieee80211_rx_mgt);
EXPORT_SYMBOL(ieee80211_rx);
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