diff options
Diffstat (limited to 'net/ieee80211/ieee80211_rx.c')
| -rw-r--r-- | net/ieee80211/ieee80211_rx.c | 1831 |
1 files changed, 0 insertions, 1831 deletions
diff --git a/net/ieee80211/ieee80211_rx.c b/net/ieee80211/ieee80211_rx.c deleted file mode 100644 index 69dbc34..0000000 --- a/net/ieee80211/ieee80211_rx.c +++ /dev/null @@ -1,1831 +0,0 @@ -/* - * 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(¶m_element, - info_element); - if (rc == 0) { - qos_param = &(network->qos_data.parameters); - ieee80211_qos_convert_ac_to_parameters(¶m_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); |
