| /* |
| * 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/lib80211.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=%pM) res=%d\n", |
| hdr->addr2, 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=%pM keyidx=%d)\n", ieee->dev->name, hdr->addr2, |
| 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; |
| |
| 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=%pM)\n", hdr->addr2); |
| 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 %pM\n", dev->name, hdr->addr2); |
| /* 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=%pM)\n", |
| hdr->addr2); |
| 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 %pM (drop_unencrypted=1)\n", |
| hdr->addr2); |
| 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 (is_empty_ssid(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 (is_empty_ssid(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) |
| { |
| 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 (%pM)' " |
| "network.\n", |
| escape_ssid(network->ssid, |
| network->ssid_len), |
| network->bssid); |
| return 1; |
| } |
| |
| if (is_empty_ssid(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; |
| |
| 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 %pM info received " |
| "off channel (%d vs. %d)\n", 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; |
| |
| IEEE80211_DEBUG_SCAN("'%s' (%pM" |
| "): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n", |
| escape_ssid(info_element->data, info_element->len), |
| 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' (%pM) via %s.\n", |
| escape_ssid(info_element->data, |
| info_element->len), |
| 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' (%pM) from " |
| "network list.\n", |
| escape_ssid(target->ssid, |
| target->ssid_len), |
| 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' (%pM) via %s.\n", |
| escape_ssid(network.ssid, |
| network.ssid_len), |
| 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' (%pM) via %s.\n", |
| escape_ssid(target->ssid, |
| target->ssid_len), |
| 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); |