/* * 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 * * Copyright (c) 2002-2003, Jouni Malinen * Copyright (c) 2004, 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static inline 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->mac.raw = skb->data; skb_pull(skb, ieee80211_get_hdrlen(fc)); skb->pkt_type = PACKET_OTHERHOST; skb->protocol = __constant_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) && memcmp(entry->src_addr, src, ETH_ALEN) == 0 && memcmp(entry->dst_addr, dst, ETH_ALEN) == 0) 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 *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) + 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 *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 inline 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 *) 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 *hdr; u8 *pos; if (skb->len < 24) return 0; hdr = (struct ieee80211_hdr *)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 && memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0 && memcmp(hdr->addr3, dev->dev_addr, ETH_ALEN) == 0) { /* ToDS frame with own addr BSSID and DA */ } else if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == IEEE80211_FCTL_FROMDS && memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0) { /* 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 inline int ieee80211_rx_frame_decrypt(struct ieee80211_device *ieee, struct sk_buff *skb, struct ieee80211_crypt_data *crypt) { struct ieee80211_hdr *hdr; int res, hdrlen; if (crypt == NULL || crypt->ops->decrypt_mpdu == NULL) return 0; hdr = (struct ieee80211_hdr *)skb->data; hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl)); #ifdef CONFIG_IEEE80211_CRYPT_TKIP if (ieee->tkip_countermeasures && strcmp(crypt->ops->name, "TKIP") == 0) { if (net_ratelimit()) { printk(KERN_DEBUG "%s: TKIP countermeasures: dropped " "received packet from " MAC_FMT "\n", ieee->dev->name, MAC_ARG(hdr->addr2)); } return -1; } #endif 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", MAC_ARG(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 inline int ieee80211_rx_frame_decrypt_msdu(struct ieee80211_device *ieee, struct sk_buff *skb, int keyidx, struct ieee80211_crypt_data *crypt) { struct ieee80211_hdr *hdr; int res, hdrlen; if (crypt == NULL || crypt->ops->decrypt_msdu == NULL) return 0; hdr = (struct ieee80211_hdr *)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, MAC_ARG(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 *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; hdr = (struct ieee80211_hdr *)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); #ifdef NOT_YET #if WIRELESS_EXT > 15 /* Put this code here so that we avoid duplicating it in all * Rx paths. - Jean II */ #ifdef IW_WIRELESS_SPY /* defined in iw_handler.h */ /* If spy monitoring on */ if (iface->spy_data.spy_number > 0) { struct iw_quality wstats; wstats.level = rx_stats->signal; wstats.noise = rx_stats->noise; wstats.updated = 6; /* No qual value */ /* Update spy records */ wireless_spy_update(dev, hdr->addr2, &wstats); } #endif /* IW_WIRELESS_SPY */ #endif /* WIRELESS_EXT > 15 */ hostap_update_rx_stats(local->ap, hdr, rx_stats); #endif #if WIRELESS_EXT > 15 if (ieee->iw_mode == IW_MODE_MONITOR) { ieee80211_monitor_rx(ieee, skb, rx_stats); stats->rx_packets++; stats->rx_bytes += skb->len; return 1; } #endif if (ieee->host_decrypt) { int idx = 0; if (skb->len >= hdrlen + 3) idx = skb->data[hdrlen + 3] >> 6; crypt = ieee->crypt[idx]; #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", MAC_ARG(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 " MAC_FMT "\n", dev->name, MAC_ARG(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 /* 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 && memcmp(hdr->addr2, ieee->assoc_ap_addr, ETH_ALEN) == 0) { /* 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. */ 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 (ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) && (keyidx = ieee80211_rx_frame_decrypt(ieee, skb, crypt)) < 0) goto rx_dropped; hdr = (struct ieee80211_hdr *)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 */ memcpy(skb_put(frag_skb, flen), skb->data, flen); } else { /* append frame payload to the end of the fragment * cache skb */ memcpy(skb_put(frag_skb, flen), skb->data + hdrlen, 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 *)skb->data; ieee80211_frag_cache_invalidate(ieee, hdr); } /* skb: hdr + (possible reassembled) full MSDU payload; possibly still * encrypted/authenticated */ if (ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) && ieee80211_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt)) goto rx_dropped; hdr = (struct ieee80211_hdr *)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", MAC_ARG(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 " MAC_FMT " (drop_unencrypted=1)\n", MAC_ARG(hdr->addr2)); 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 { u16 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 */ memcpy(skb->data + 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->protocol = __constant_htons(ETH_P_802_3); skb2->mac.raw = skb2->nh.raw = skb2->data; /* skb2->nh.raw = skb2->data + ETH_HLEN; */ skb2->dev = dev; dev_queue_xmit(skb2); } #endif if (skb) { skb->protocol = eth_type_trans(skb, dev); memset(skb->cb, 0, sizeof(skb->cb)); skb->dev = dev; skb->ip_summed = CHECKSUM_NONE; /* 802.11 crc not sufficient */ netif_rx(skb); } 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; } #define MGMT_FRAME_FIXED_PART_LENGTH 0x24 static inline int ieee80211_is_ofdm_rate(u8 rate) { switch (rate & ~IEEE80211_BASIC_RATE_MASK) { case IEEE80211_OFDM_RATE_6MB: case IEEE80211_OFDM_RATE_9MB: case IEEE80211_OFDM_RATE_12MB: case IEEE80211_OFDM_RATE_18MB: case IEEE80211_OFDM_RATE_24MB: case IEEE80211_OFDM_RATE_36MB: case IEEE80211_OFDM_RATE_48MB: case IEEE80211_OFDM_RATE_54MB: return 1; } return 0; } static inline int ieee80211_network_init(struct ieee80211_device *ieee, struct ieee80211_probe_response *beacon, struct ieee80211_network *network, struct ieee80211_rx_stats *stats) { #ifdef CONFIG_IEEE80211_DEBUG char rates_str[64]; char *p; #endif struct ieee80211_info_element *info_element; u16 left; u8 i; /* Pull out fixed field data */ memcpy(network->bssid, beacon->header.addr3, ETH_ALEN); network->capability = beacon->capability; network->last_scanned = jiffies; network->time_stamp[0] = beacon->time_stamp[0]; network->time_stamp[1] = beacon->time_stamp[1]; network->beacon_interval = 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; 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; info_element = &beacon->info_element; left = stats->len - ((void *)info_element - (void *)beacon); while (left >= sizeof(struct ieee80211_info_element_hdr)) { if (sizeof(struct ieee80211_info_element_hdr) + info_element->len > left) { IEEE80211_DEBUG_SCAN ("SCAN: parse failed: info_element->len + 2 > left : info_element->len+2=%Zd left=%d.\n", info_element->len + sizeof(struct ieee80211_info_element), left); return 1; } 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_SCAN("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_SCAN("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_SCAN("MFIE_TYPE_RATES_EX: '%s' (%d)\n", rates_str, network->rates_ex_len); break; case MFIE_TYPE_DS_SET: IEEE80211_DEBUG_SCAN("MFIE_TYPE_DS_SET: %d\n", info_element->data[0]); if (stats->freq == IEEE80211_24GHZ_BAND) network->channel = info_element->data[0]; break; case MFIE_TYPE_FH_SET: IEEE80211_DEBUG_SCAN("MFIE_TYPE_FH_SET: ignored\n"); break; case MFIE_TYPE_CF_SET: IEEE80211_DEBUG_SCAN("MFIE_TYPE_CF_SET: ignored\n"); break; case MFIE_TYPE_TIM: IEEE80211_DEBUG_SCAN("MFIE_TYPE_TIM: ignored\n"); break; case MFIE_TYPE_IBSS_SET: IEEE80211_DEBUG_SCAN("MFIE_TYPE_IBSS_SET: ignored\n"); break; case MFIE_TYPE_CHALLENGE: IEEE80211_DEBUG_SCAN("MFIE_TYPE_CHALLENGE: ignored\n"); break; case MFIE_TYPE_GENERIC: IEEE80211_DEBUG_SCAN("MFIE_TYPE_GENERIC: %d bytes\n", info_element->len); 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_SCAN("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; default: IEEE80211_DEBUG_SCAN("unsupported IE %d\n", info_element->id); break; } left -= sizeof(struct ieee80211_info_element_hdr) + info_element->len; info_element = (struct ieee80211_info_element *) &info_element->data[info_element->len]; } 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 (" MAC_FMT ")' " "network.\n", escape_essid(network->ssid, network->ssid_len), MAC_ARG(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 with the same BSSID and channel * as one network */ return ((src->ssid_len == dst->ssid_len) && (src->channel == dst->channel) && !memcmp(src->bssid, dst->bssid, ETH_ALEN) && !memcmp(src->ssid, dst->ssid, src->ssid_len)); } static inline void update_network(struct ieee80211_network *dst, struct ieee80211_network *src) { memcpy(&dst->stats, &src->stats, sizeof(struct ieee80211_rx_stats)); 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; 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; /* dst->last_associate is not overwritten */ } static inline void ieee80211_process_probe_response(struct ieee80211_device *ieee, struct ieee80211_probe_response *beacon, struct ieee80211_rx_stats *stats) { struct ieee80211_network network; 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' (" MAC_FMT "): %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), MAC_ARG(beacon->header.addr3), (beacon->capability & (1 << 0xf)) ? '1' : '0', (beacon->capability & (1 << 0xe)) ? '1' : '0', (beacon->capability & (1 << 0xd)) ? '1' : '0', (beacon->capability & (1 << 0xc)) ? '1' : '0', (beacon->capability & (1 << 0xb)) ? '1' : '0', (beacon->capability & (1 << 0xa)) ? '1' : '0', (beacon->capability & (1 << 0x9)) ? '1' : '0', (beacon->capability & (1 << 0x8)) ? '1' : '0', (beacon->capability & (1 << 0x7)) ? '1' : '0', (beacon->capability & (1 << 0x6)) ? '1' : '0', (beacon->capability & (1 << 0x5)) ? '1' : '0', (beacon->capability & (1 << 0x4)) ? '1' : '0', (beacon->capability & (1 << 0x3)) ? '1' : '0', (beacon->capability & (1 << 0x2)) ? '1' : '0', (beacon->capability & (1 << 0x1)) ? '1' : '0', (beacon->capability & (1 << 0x0)) ? '1' : '0'); if (ieee80211_network_init(ieee, beacon, &network, stats)) { IEEE80211_DEBUG_SCAN("Dropped '%s' (" MAC_FMT ") via %s.\n", escape_essid(info_element->data, info_element->len), MAC_ARG(beacon->header.addr3), WLAN_FC_GET_STYPE(beacon->header. frame_ctl) == IEEE80211_STYPE_PROBE_RESP ? "PROBE RESPONSE" : "BEACON"); 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' (" MAC_FMT ") from " "network list.\n", escape_essid(target->ssid, target->ssid_len), MAC_ARG(target->bssid)); } 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' (" MAC_FMT ") via %s.\n", escape_essid(network.ssid, network.ssid_len), MAC_ARG(network.bssid), WLAN_FC_GET_STYPE(beacon->header. frame_ctl) == IEEE80211_STYPE_PROBE_RESP ? "PROBE RESPONSE" : "BEACON"); #endif memcpy(target, &network, sizeof(*target)); list_add_tail(&target->list, &ieee->network_list); } else { IEEE80211_DEBUG_SCAN("Updating '%s' (" MAC_FMT ") via %s.\n", escape_essid(target->ssid, target->ssid_len), MAC_ARG(target->bssid), WLAN_FC_GET_STYPE(beacon->header. frame_ctl) == IEEE80211_STYPE_PROBE_RESP ? "PROBE RESPONSE" : "BEACON"); update_network(target, &network); } spin_unlock_irqrestore(&ieee->lock, flags); } void ieee80211_rx_mgt(struct ieee80211_device *ieee, struct ieee80211_hdr *header, struct ieee80211_rx_stats *stats) { switch (WLAN_FC_GET_STYPE(header->frame_ctl)) { case IEEE80211_STYPE_ASSOC_RESP: IEEE80211_DEBUG_MGMT("received ASSOCIATION RESPONSE (%d)\n", WLAN_FC_GET_STYPE(header->frame_ctl)); break; case IEEE80211_STYPE_REASSOC_RESP: IEEE80211_DEBUG_MGMT("received REASSOCIATION RESPONSE (%d)\n", WLAN_FC_GET_STYPE(header->frame_ctl)); break; case IEEE80211_STYPE_PROBE_RESP: IEEE80211_DEBUG_MGMT("received PROBE RESPONSE (%d)\n", WLAN_FC_GET_STYPE(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(header->frame_ctl)); IEEE80211_DEBUG_SCAN("Beacon\n"); ieee80211_process_probe_response(ieee, (struct ieee80211_probe_response *) header, stats); break; default: IEEE80211_DEBUG_MGMT("received UNKNOWN (%d)\n", WLAN_FC_GET_STYPE(header->frame_ctl)); IEEE80211_WARNING("%s: Unknown management packet: %d\n", ieee->dev->name, WLAN_FC_GET_STYPE(header->frame_ctl)); break; } } EXPORT_SYMBOL(ieee80211_rx_mgt); EXPORT_SYMBOL(ieee80211_rx);