Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame^] | 1 | /* |
| 2 | * Original code based Host AP (software wireless LAN access point) driver |
| 3 | * for Intersil Prism2/2.5/3 - hostap.o module, common routines |
| 4 | * |
| 5 | * Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen |
| 6 | * <jkmaline@cc.hut.fi> |
| 7 | * Copyright (c) 2002-2003, Jouni Malinen <jkmaline@cc.hut.fi> |
| 8 | * Copyright (c) 2004, Intel Corporation |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License version 2 as |
| 12 | * published by the Free Software Foundation. See README and COPYING for |
| 13 | * more details. |
| 14 | */ |
| 15 | |
| 16 | #include <linux/compiler.h> |
| 17 | #include <linux/config.h> |
| 18 | #include <linux/errno.h> |
| 19 | #include <linux/if_arp.h> |
| 20 | #include <linux/in6.h> |
| 21 | #include <linux/in.h> |
| 22 | #include <linux/ip.h> |
| 23 | #include <linux/kernel.h> |
| 24 | #include <linux/module.h> |
| 25 | #include <linux/netdevice.h> |
| 26 | #include <linux/pci.h> |
| 27 | #include <linux/proc_fs.h> |
| 28 | #include <linux/skbuff.h> |
| 29 | #include <linux/slab.h> |
| 30 | #include <linux/tcp.h> |
| 31 | #include <linux/types.h> |
| 32 | #include <linux/version.h> |
| 33 | #include <linux/wireless.h> |
| 34 | #include <linux/etherdevice.h> |
| 35 | #include <asm/uaccess.h> |
| 36 | #include <linux/ctype.h> |
| 37 | |
| 38 | #include <net/ieee80211.h> |
| 39 | |
| 40 | static inline void ieee80211_monitor_rx(struct ieee80211_device *ieee, |
| 41 | struct sk_buff *skb, |
| 42 | struct ieee80211_rx_stats *rx_stats) |
| 43 | { |
| 44 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
| 45 | u16 fc = le16_to_cpu(hdr->frame_ctl); |
| 46 | |
| 47 | skb->dev = ieee->dev; |
| 48 | skb->mac.raw = skb->data; |
| 49 | skb_pull(skb, ieee80211_get_hdrlen(fc)); |
| 50 | skb->pkt_type = PACKET_OTHERHOST; |
| 51 | skb->protocol = __constant_htons(ETH_P_80211_RAW); |
| 52 | memset(skb->cb, 0, sizeof(skb->cb)); |
| 53 | netif_rx(skb); |
| 54 | } |
| 55 | |
| 56 | |
| 57 | /* Called only as a tasklet (software IRQ) */ |
| 58 | static struct ieee80211_frag_entry * |
| 59 | ieee80211_frag_cache_find(struct ieee80211_device *ieee, unsigned int seq, |
| 60 | unsigned int frag, u8 *src, u8 *dst) |
| 61 | { |
| 62 | struct ieee80211_frag_entry *entry; |
| 63 | int i; |
| 64 | |
| 65 | for (i = 0; i < IEEE80211_FRAG_CACHE_LEN; i++) { |
| 66 | entry = &ieee->frag_cache[i]; |
| 67 | if (entry->skb != NULL && |
| 68 | time_after(jiffies, entry->first_frag_time + 2 * HZ)) { |
| 69 | IEEE80211_DEBUG_FRAG( |
| 70 | "expiring fragment cache entry " |
| 71 | "seq=%u last_frag=%u\n", |
| 72 | entry->seq, entry->last_frag); |
| 73 | dev_kfree_skb_any(entry->skb); |
| 74 | entry->skb = NULL; |
| 75 | } |
| 76 | |
| 77 | if (entry->skb != NULL && entry->seq == seq && |
| 78 | (entry->last_frag + 1 == frag || frag == -1) && |
| 79 | memcmp(entry->src_addr, src, ETH_ALEN) == 0 && |
| 80 | memcmp(entry->dst_addr, dst, ETH_ALEN) == 0) |
| 81 | return entry; |
| 82 | } |
| 83 | |
| 84 | return NULL; |
| 85 | } |
| 86 | |
| 87 | /* Called only as a tasklet (software IRQ) */ |
| 88 | static struct sk_buff * |
| 89 | ieee80211_frag_cache_get(struct ieee80211_device *ieee, |
| 90 | struct ieee80211_hdr *hdr) |
| 91 | { |
| 92 | struct sk_buff *skb = NULL; |
| 93 | u16 sc; |
| 94 | unsigned int frag, seq; |
| 95 | struct ieee80211_frag_entry *entry; |
| 96 | |
| 97 | sc = le16_to_cpu(hdr->seq_ctl); |
| 98 | frag = WLAN_GET_SEQ_FRAG(sc); |
| 99 | seq = WLAN_GET_SEQ_SEQ(sc); |
| 100 | |
| 101 | if (frag == 0) { |
| 102 | /* Reserve enough space to fit maximum frame length */ |
| 103 | skb = dev_alloc_skb(ieee->dev->mtu + |
| 104 | sizeof(struct ieee80211_hdr) + |
| 105 | 8 /* LLC */ + |
| 106 | 2 /* alignment */ + |
| 107 | 8 /* WEP */ + ETH_ALEN /* WDS */); |
| 108 | if (skb == NULL) |
| 109 | return NULL; |
| 110 | |
| 111 | entry = &ieee->frag_cache[ieee->frag_next_idx]; |
| 112 | ieee->frag_next_idx++; |
| 113 | if (ieee->frag_next_idx >= IEEE80211_FRAG_CACHE_LEN) |
| 114 | ieee->frag_next_idx = 0; |
| 115 | |
| 116 | if (entry->skb != NULL) |
| 117 | dev_kfree_skb_any(entry->skb); |
| 118 | |
| 119 | entry->first_frag_time = jiffies; |
| 120 | entry->seq = seq; |
| 121 | entry->last_frag = frag; |
| 122 | entry->skb = skb; |
| 123 | memcpy(entry->src_addr, hdr->addr2, ETH_ALEN); |
| 124 | memcpy(entry->dst_addr, hdr->addr1, ETH_ALEN); |
| 125 | } else { |
| 126 | /* received a fragment of a frame for which the head fragment |
| 127 | * should have already been received */ |
| 128 | entry = ieee80211_frag_cache_find(ieee, seq, frag, hdr->addr2, |
| 129 | hdr->addr1); |
| 130 | if (entry != NULL) { |
| 131 | entry->last_frag = frag; |
| 132 | skb = entry->skb; |
| 133 | } |
| 134 | } |
| 135 | |
| 136 | return skb; |
| 137 | } |
| 138 | |
| 139 | |
| 140 | /* Called only as a tasklet (software IRQ) */ |
| 141 | static int ieee80211_frag_cache_invalidate(struct ieee80211_device *ieee, |
| 142 | struct ieee80211_hdr *hdr) |
| 143 | { |
| 144 | u16 sc; |
| 145 | unsigned int seq; |
| 146 | struct ieee80211_frag_entry *entry; |
| 147 | |
| 148 | sc = le16_to_cpu(hdr->seq_ctl); |
| 149 | seq = WLAN_GET_SEQ_SEQ(sc); |
| 150 | |
| 151 | entry = ieee80211_frag_cache_find(ieee, seq, -1, hdr->addr2, |
| 152 | hdr->addr1); |
| 153 | |
| 154 | if (entry == NULL) { |
| 155 | IEEE80211_DEBUG_FRAG( |
| 156 | "could not invalidate fragment cache " |
| 157 | "entry (seq=%u)\n", seq); |
| 158 | return -1; |
| 159 | } |
| 160 | |
| 161 | entry->skb = NULL; |
| 162 | return 0; |
| 163 | } |
| 164 | |
| 165 | |
| 166 | #ifdef NOT_YET |
| 167 | /* ieee80211_rx_frame_mgtmt |
| 168 | * |
| 169 | * Responsible for handling management control frames |
| 170 | * |
| 171 | * Called by ieee80211_rx */ |
| 172 | static inline int |
| 173 | ieee80211_rx_frame_mgmt(struct ieee80211_device *ieee, struct sk_buff *skb, |
| 174 | struct ieee80211_rx_stats *rx_stats, u16 type, |
| 175 | u16 stype) |
| 176 | { |
| 177 | if (ieee->iw_mode == IW_MODE_MASTER) { |
| 178 | printk(KERN_DEBUG "%s: Master mode not yet suppported.\n", |
| 179 | ieee->dev->name); |
| 180 | return 0; |
| 181 | /* |
| 182 | hostap_update_sta_ps(ieee, (struct hostap_ieee80211_hdr *) |
| 183 | skb->data);*/ |
| 184 | } |
| 185 | |
| 186 | if (ieee->hostapd && type == WLAN_FC_TYPE_MGMT) { |
| 187 | if (stype == WLAN_FC_STYPE_BEACON && |
| 188 | ieee->iw_mode == IW_MODE_MASTER) { |
| 189 | struct sk_buff *skb2; |
| 190 | /* Process beacon frames also in kernel driver to |
| 191 | * update STA(AP) table statistics */ |
| 192 | skb2 = skb_clone(skb, GFP_ATOMIC); |
| 193 | if (skb2) |
| 194 | hostap_rx(skb2->dev, skb2, rx_stats); |
| 195 | } |
| 196 | |
| 197 | /* send management frames to the user space daemon for |
| 198 | * processing */ |
| 199 | ieee->apdevstats.rx_packets++; |
| 200 | ieee->apdevstats.rx_bytes += skb->len; |
| 201 | prism2_rx_80211(ieee->apdev, skb, rx_stats, PRISM2_RX_MGMT); |
| 202 | return 0; |
| 203 | } |
| 204 | |
| 205 | if (ieee->iw_mode == IW_MODE_MASTER) { |
| 206 | if (type != WLAN_FC_TYPE_MGMT && type != WLAN_FC_TYPE_CTRL) { |
| 207 | printk(KERN_DEBUG "%s: unknown management frame " |
| 208 | "(type=0x%02x, stype=0x%02x) dropped\n", |
| 209 | skb->dev->name, type, stype); |
| 210 | return -1; |
| 211 | } |
| 212 | |
| 213 | hostap_rx(skb->dev, skb, rx_stats); |
| 214 | return 0; |
| 215 | } |
| 216 | |
| 217 | printk(KERN_DEBUG "%s: hostap_rx_frame_mgmt: management frame " |
| 218 | "received in non-Host AP mode\n", skb->dev->name); |
| 219 | return -1; |
| 220 | } |
| 221 | #endif |
| 222 | |
| 223 | |
| 224 | /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */ |
| 225 | /* Ethernet-II snap header (RFC1042 for most EtherTypes) */ |
| 226 | static unsigned char rfc1042_header[] = |
| 227 | { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 }; |
| 228 | /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */ |
| 229 | static unsigned char bridge_tunnel_header[] = |
| 230 | { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 }; |
| 231 | /* No encapsulation header if EtherType < 0x600 (=length) */ |
| 232 | |
| 233 | /* Called by ieee80211_rx_frame_decrypt */ |
| 234 | static int ieee80211_is_eapol_frame(struct ieee80211_device *ieee, |
| 235 | struct sk_buff *skb) |
| 236 | { |
| 237 | struct net_device *dev = ieee->dev; |
| 238 | u16 fc, ethertype; |
| 239 | struct ieee80211_hdr *hdr; |
| 240 | u8 *pos; |
| 241 | |
| 242 | if (skb->len < 24) |
| 243 | return 0; |
| 244 | |
| 245 | hdr = (struct ieee80211_hdr *) skb->data; |
| 246 | fc = le16_to_cpu(hdr->frame_ctl); |
| 247 | |
| 248 | /* check that the frame is unicast frame to us */ |
| 249 | if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == |
| 250 | IEEE80211_FCTL_TODS && |
| 251 | memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0 && |
| 252 | memcmp(hdr->addr3, dev->dev_addr, ETH_ALEN) == 0) { |
| 253 | /* ToDS frame with own addr BSSID and DA */ |
| 254 | } else if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == |
| 255 | IEEE80211_FCTL_FROMDS && |
| 256 | memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0) { |
| 257 | /* FromDS frame with own addr as DA */ |
| 258 | } else |
| 259 | return 0; |
| 260 | |
| 261 | if (skb->len < 24 + 8) |
| 262 | return 0; |
| 263 | |
| 264 | /* check for port access entity Ethernet type */ |
| 265 | pos = skb->data + 24; |
| 266 | ethertype = (pos[6] << 8) | pos[7]; |
| 267 | if (ethertype == ETH_P_PAE) |
| 268 | return 1; |
| 269 | |
| 270 | return 0; |
| 271 | } |
| 272 | |
| 273 | /* Called only as a tasklet (software IRQ), by ieee80211_rx */ |
| 274 | static inline int |
| 275 | ieee80211_rx_frame_decrypt(struct ieee80211_device* ieee, struct sk_buff *skb, |
| 276 | struct ieee80211_crypt_data *crypt) |
| 277 | { |
| 278 | struct ieee80211_hdr *hdr; |
| 279 | int res, hdrlen; |
| 280 | |
| 281 | if (crypt == NULL || crypt->ops->decrypt_mpdu == NULL) |
| 282 | return 0; |
| 283 | |
| 284 | hdr = (struct ieee80211_hdr *) skb->data; |
| 285 | hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl)); |
| 286 | |
| 287 | #ifdef CONFIG_IEEE80211_CRYPT_TKIP |
| 288 | if (ieee->tkip_countermeasures && |
| 289 | strcmp(crypt->ops->name, "TKIP") == 0) { |
| 290 | if (net_ratelimit()) { |
| 291 | printk(KERN_DEBUG "%s: TKIP countermeasures: dropped " |
| 292 | "received packet from " MAC_FMT "\n", |
| 293 | ieee->dev->name, MAC_ARG(hdr->addr2)); |
| 294 | } |
| 295 | return -1; |
| 296 | } |
| 297 | #endif |
| 298 | |
| 299 | atomic_inc(&crypt->refcnt); |
| 300 | res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv); |
| 301 | atomic_dec(&crypt->refcnt); |
| 302 | if (res < 0) { |
| 303 | IEEE80211_DEBUG_DROP( |
| 304 | "decryption failed (SA=" MAC_FMT |
| 305 | ") res=%d\n", MAC_ARG(hdr->addr2), res); |
| 306 | if (res == -2) |
| 307 | IEEE80211_DEBUG_DROP("Decryption failed ICV " |
| 308 | "mismatch (key %d)\n", |
| 309 | skb->data[hdrlen + 3] >> 6); |
| 310 | ieee->ieee_stats.rx_discards_undecryptable++; |
| 311 | return -1; |
| 312 | } |
| 313 | |
| 314 | return res; |
| 315 | } |
| 316 | |
| 317 | |
| 318 | /* Called only as a tasklet (software IRQ), by ieee80211_rx */ |
| 319 | static inline int |
| 320 | ieee80211_rx_frame_decrypt_msdu(struct ieee80211_device* ieee, struct sk_buff *skb, |
| 321 | int keyidx, struct ieee80211_crypt_data *crypt) |
| 322 | { |
| 323 | struct ieee80211_hdr *hdr; |
| 324 | int res, hdrlen; |
| 325 | |
| 326 | if (crypt == NULL || crypt->ops->decrypt_msdu == NULL) |
| 327 | return 0; |
| 328 | |
| 329 | hdr = (struct ieee80211_hdr *) skb->data; |
| 330 | hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl)); |
| 331 | |
| 332 | atomic_inc(&crypt->refcnt); |
| 333 | res = crypt->ops->decrypt_msdu(skb, keyidx, hdrlen, crypt->priv); |
| 334 | atomic_dec(&crypt->refcnt); |
| 335 | if (res < 0) { |
| 336 | printk(KERN_DEBUG "%s: MSDU decryption/MIC verification failed" |
| 337 | " (SA=" MAC_FMT " keyidx=%d)\n", |
| 338 | ieee->dev->name, MAC_ARG(hdr->addr2), keyidx); |
| 339 | return -1; |
| 340 | } |
| 341 | |
| 342 | return 0; |
| 343 | } |
| 344 | |
| 345 | |
| 346 | /* All received frames are sent to this function. @skb contains the frame in |
| 347 | * IEEE 802.11 format, i.e., in the format it was sent over air. |
| 348 | * This function is called only as a tasklet (software IRQ). */ |
| 349 | int ieee80211_rx(struct ieee80211_device *ieee, struct sk_buff *skb, |
| 350 | struct ieee80211_rx_stats *rx_stats) |
| 351 | { |
| 352 | struct net_device *dev = ieee->dev; |
| 353 | struct ieee80211_hdr *hdr; |
| 354 | size_t hdrlen; |
| 355 | u16 fc, type, stype, sc; |
| 356 | struct net_device_stats *stats; |
| 357 | unsigned int frag; |
| 358 | u8 *payload; |
| 359 | u16 ethertype; |
| 360 | #ifdef NOT_YET |
| 361 | struct net_device *wds = NULL; |
| 362 | struct sk_buff *skb2 = NULL; |
| 363 | struct net_device *wds = NULL; |
| 364 | int frame_authorized = 0; |
| 365 | int from_assoc_ap = 0; |
| 366 | void *sta = NULL; |
| 367 | #endif |
| 368 | u8 dst[ETH_ALEN]; |
| 369 | u8 src[ETH_ALEN]; |
| 370 | struct ieee80211_crypt_data *crypt = NULL; |
| 371 | int keyidx = 0; |
| 372 | |
| 373 | hdr = (struct ieee80211_hdr *)skb->data; |
| 374 | stats = &ieee->stats; |
| 375 | |
| 376 | if (skb->len < 10) { |
| 377 | printk(KERN_INFO "%s: SKB length < 10\n", |
| 378 | dev->name); |
| 379 | goto rx_dropped; |
| 380 | } |
| 381 | |
| 382 | fc = le16_to_cpu(hdr->frame_ctl); |
| 383 | type = WLAN_FC_GET_TYPE(fc); |
| 384 | stype = WLAN_FC_GET_STYPE(fc); |
| 385 | sc = le16_to_cpu(hdr->seq_ctl); |
| 386 | frag = WLAN_GET_SEQ_FRAG(sc); |
| 387 | hdrlen = ieee80211_get_hdrlen(fc); |
| 388 | |
| 389 | #ifdef NOT_YET |
| 390 | #if WIRELESS_EXT > 15 |
| 391 | /* Put this code here so that we avoid duplicating it in all |
| 392 | * Rx paths. - Jean II */ |
| 393 | #ifdef IW_WIRELESS_SPY /* defined in iw_handler.h */ |
| 394 | /* If spy monitoring on */ |
| 395 | if (iface->spy_data.spy_number > 0) { |
| 396 | struct iw_quality wstats; |
| 397 | wstats.level = rx_stats->signal; |
| 398 | wstats.noise = rx_stats->noise; |
| 399 | wstats.updated = 6; /* No qual value */ |
| 400 | /* Update spy records */ |
| 401 | wireless_spy_update(dev, hdr->addr2, &wstats); |
| 402 | } |
| 403 | #endif /* IW_WIRELESS_SPY */ |
| 404 | #endif /* WIRELESS_EXT > 15 */ |
| 405 | hostap_update_rx_stats(local->ap, hdr, rx_stats); |
| 406 | #endif |
| 407 | |
| 408 | #if WIRELESS_EXT > 15 |
| 409 | if (ieee->iw_mode == IW_MODE_MONITOR) { |
| 410 | ieee80211_monitor_rx(ieee, skb, rx_stats); |
| 411 | stats->rx_packets++; |
| 412 | stats->rx_bytes += skb->len; |
| 413 | return 1; |
| 414 | } |
| 415 | #endif |
| 416 | |
| 417 | if (ieee->host_decrypt) { |
| 418 | int idx = 0; |
| 419 | if (skb->len >= hdrlen + 3) |
| 420 | idx = skb->data[hdrlen + 3] >> 6; |
| 421 | crypt = ieee->crypt[idx]; |
| 422 | #ifdef NOT_YET |
| 423 | sta = NULL; |
| 424 | |
| 425 | /* Use station specific key to override default keys if the |
| 426 | * receiver address is a unicast address ("individual RA"). If |
| 427 | * bcrx_sta_key parameter is set, station specific key is used |
| 428 | * even with broad/multicast targets (this is against IEEE |
| 429 | * 802.11, but makes it easier to use different keys with |
| 430 | * stations that do not support WEP key mapping). */ |
| 431 | |
| 432 | if (!(hdr->addr1[0] & 0x01) || local->bcrx_sta_key) |
| 433 | (void) hostap_handle_sta_crypto(local, hdr, &crypt, |
| 434 | &sta); |
| 435 | #endif |
| 436 | |
| 437 | /* allow NULL decrypt to indicate an station specific override |
| 438 | * for default encryption */ |
| 439 | if (crypt && (crypt->ops == NULL || |
| 440 | crypt->ops->decrypt_mpdu == NULL)) |
| 441 | crypt = NULL; |
| 442 | |
| 443 | if (!crypt && (fc & IEEE80211_FCTL_WEP)) { |
| 444 | /* This seems to be triggered by some (multicast?) |
| 445 | * frames from other than current BSS, so just drop the |
| 446 | * frames silently instead of filling system log with |
| 447 | * these reports. */ |
| 448 | IEEE80211_DEBUG_DROP("Decryption failed (not set)" |
| 449 | " (SA=" MAC_FMT ")\n", |
| 450 | MAC_ARG(hdr->addr2)); |
| 451 | ieee->ieee_stats.rx_discards_undecryptable++; |
| 452 | goto rx_dropped; |
| 453 | } |
| 454 | } |
| 455 | |
| 456 | #ifdef NOT_YET |
| 457 | if (type != WLAN_FC_TYPE_DATA) { |
| 458 | if (type == WLAN_FC_TYPE_MGMT && stype == WLAN_FC_STYPE_AUTH && |
| 459 | fc & IEEE80211_FCTL_WEP && ieee->host_decrypt && |
| 460 | (keyidx = hostap_rx_frame_decrypt(ieee, skb, crypt)) < 0) |
| 461 | { |
| 462 | printk(KERN_DEBUG "%s: failed to decrypt mgmt::auth " |
| 463 | "from " MAC_FMT "\n", dev->name, |
| 464 | MAC_ARG(hdr->addr2)); |
| 465 | /* TODO: could inform hostapd about this so that it |
| 466 | * could send auth failure report */ |
| 467 | goto rx_dropped; |
| 468 | } |
| 469 | |
| 470 | if (ieee80211_rx_frame_mgmt(ieee, skb, rx_stats, type, stype)) |
| 471 | goto rx_dropped; |
| 472 | else |
| 473 | goto rx_exit; |
| 474 | } |
| 475 | #endif |
| 476 | |
| 477 | /* Data frame - extract src/dst addresses */ |
| 478 | if (skb->len < IEEE80211_DATA_HDR3_LEN) |
| 479 | goto rx_dropped; |
| 480 | |
| 481 | switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) { |
| 482 | case IEEE80211_FCTL_FROMDS: |
| 483 | memcpy(dst, hdr->addr1, ETH_ALEN); |
| 484 | memcpy(src, hdr->addr3, ETH_ALEN); |
| 485 | break; |
| 486 | case IEEE80211_FCTL_TODS: |
| 487 | memcpy(dst, hdr->addr3, ETH_ALEN); |
| 488 | memcpy(src, hdr->addr2, ETH_ALEN); |
| 489 | break; |
| 490 | case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS: |
| 491 | if (skb->len < IEEE80211_DATA_HDR4_LEN) |
| 492 | goto rx_dropped; |
| 493 | memcpy(dst, hdr->addr3, ETH_ALEN); |
| 494 | memcpy(src, hdr->addr4, ETH_ALEN); |
| 495 | break; |
| 496 | case 0: |
| 497 | memcpy(dst, hdr->addr1, ETH_ALEN); |
| 498 | memcpy(src, hdr->addr2, ETH_ALEN); |
| 499 | break; |
| 500 | } |
| 501 | |
| 502 | #ifdef NOT_YET |
| 503 | if (hostap_rx_frame_wds(ieee, hdr, fc, &wds)) |
| 504 | goto rx_dropped; |
| 505 | if (wds) { |
| 506 | skb->dev = dev = wds; |
| 507 | stats = hostap_get_stats(dev); |
| 508 | } |
| 509 | |
| 510 | if (ieee->iw_mode == IW_MODE_MASTER && !wds && |
| 511 | (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == IEEE80211_FCTL_FROMDS && |
| 512 | ieee->stadev && |
| 513 | memcmp(hdr->addr2, ieee->assoc_ap_addr, ETH_ALEN) == 0) { |
| 514 | /* Frame from BSSID of the AP for which we are a client */ |
| 515 | skb->dev = dev = ieee->stadev; |
| 516 | stats = hostap_get_stats(dev); |
| 517 | from_assoc_ap = 1; |
| 518 | } |
| 519 | #endif |
| 520 | |
| 521 | dev->last_rx = jiffies; |
| 522 | |
| 523 | #ifdef NOT_YET |
| 524 | if ((ieee->iw_mode == IW_MODE_MASTER || |
| 525 | ieee->iw_mode == IW_MODE_REPEAT) && |
| 526 | !from_assoc_ap) { |
| 527 | switch (hostap_handle_sta_rx(ieee, dev, skb, rx_stats, |
| 528 | wds != NULL)) { |
| 529 | case AP_RX_CONTINUE_NOT_AUTHORIZED: |
| 530 | frame_authorized = 0; |
| 531 | break; |
| 532 | case AP_RX_CONTINUE: |
| 533 | frame_authorized = 1; |
| 534 | break; |
| 535 | case AP_RX_DROP: |
| 536 | goto rx_dropped; |
| 537 | case AP_RX_EXIT: |
| 538 | goto rx_exit; |
| 539 | } |
| 540 | } |
| 541 | #endif |
| 542 | |
| 543 | /* Nullfunc frames may have PS-bit set, so they must be passed to |
| 544 | * hostap_handle_sta_rx() before being dropped here. */ |
| 545 | if (stype != IEEE80211_STYPE_DATA && |
| 546 | stype != IEEE80211_STYPE_DATA_CFACK && |
| 547 | stype != IEEE80211_STYPE_DATA_CFPOLL && |
| 548 | stype != IEEE80211_STYPE_DATA_CFACKPOLL) { |
| 549 | if (stype != IEEE80211_STYPE_NULLFUNC) |
| 550 | IEEE80211_DEBUG_DROP( |
| 551 | "RX: dropped data frame " |
| 552 | "with no data (type=0x%02x, " |
| 553 | "subtype=0x%02x, len=%d)\n", |
| 554 | type, stype, skb->len); |
| 555 | goto rx_dropped; |
| 556 | } |
| 557 | |
| 558 | /* skb: hdr + (possibly fragmented, possibly encrypted) payload */ |
| 559 | |
| 560 | if (ieee->host_decrypt && (fc & IEEE80211_FCTL_WEP) && |
| 561 | (keyidx = ieee80211_rx_frame_decrypt(ieee, skb, crypt)) < 0) |
| 562 | goto rx_dropped; |
| 563 | |
| 564 | hdr = (struct ieee80211_hdr *) skb->data; |
| 565 | |
| 566 | /* skb: hdr + (possibly fragmented) plaintext payload */ |
| 567 | // PR: FIXME: hostap has additional conditions in the "if" below: |
| 568 | // ieee->host_decrypt && (fc & IEEE80211_FCTL_WEP) && |
| 569 | if ((frag != 0 || (fc & IEEE80211_FCTL_MOREFRAGS))) { |
| 570 | int flen; |
| 571 | struct sk_buff *frag_skb = ieee80211_frag_cache_get(ieee, hdr); |
| 572 | IEEE80211_DEBUG_FRAG("Rx Fragment received (%u)\n", frag); |
| 573 | |
| 574 | if (!frag_skb) { |
| 575 | IEEE80211_DEBUG(IEEE80211_DL_RX | IEEE80211_DL_FRAG, |
| 576 | "Rx cannot get skb from fragment " |
| 577 | "cache (morefrag=%d seq=%u frag=%u)\n", |
| 578 | (fc & IEEE80211_FCTL_MOREFRAGS) != 0, |
| 579 | WLAN_GET_SEQ_SEQ(sc), frag); |
| 580 | goto rx_dropped; |
| 581 | } |
| 582 | |
| 583 | flen = skb->len; |
| 584 | if (frag != 0) |
| 585 | flen -= hdrlen; |
| 586 | |
| 587 | if (frag_skb->tail + flen > frag_skb->end) { |
| 588 | printk(KERN_WARNING "%s: host decrypted and " |
| 589 | "reassembled frame did not fit skb\n", |
| 590 | dev->name); |
| 591 | ieee80211_frag_cache_invalidate(ieee, hdr); |
| 592 | goto rx_dropped; |
| 593 | } |
| 594 | |
| 595 | if (frag == 0) { |
| 596 | /* copy first fragment (including full headers) into |
| 597 | * beginning of the fragment cache skb */ |
| 598 | memcpy(skb_put(frag_skb, flen), skb->data, flen); |
| 599 | } else { |
| 600 | /* append frame payload to the end of the fragment |
| 601 | * cache skb */ |
| 602 | memcpy(skb_put(frag_skb, flen), skb->data + hdrlen, |
| 603 | flen); |
| 604 | } |
| 605 | dev_kfree_skb_any(skb); |
| 606 | skb = NULL; |
| 607 | |
| 608 | if (fc & IEEE80211_FCTL_MOREFRAGS) { |
| 609 | /* more fragments expected - leave the skb in fragment |
| 610 | * cache for now; it will be delivered to upper layers |
| 611 | * after all fragments have been received */ |
| 612 | goto rx_exit; |
| 613 | } |
| 614 | |
| 615 | /* this was the last fragment and the frame will be |
| 616 | * delivered, so remove skb from fragment cache */ |
| 617 | skb = frag_skb; |
| 618 | hdr = (struct ieee80211_hdr *) skb->data; |
| 619 | ieee80211_frag_cache_invalidate(ieee, hdr); |
| 620 | } |
| 621 | |
| 622 | /* skb: hdr + (possible reassembled) full MSDU payload; possibly still |
| 623 | * encrypted/authenticated */ |
| 624 | if (ieee->host_decrypt && (fc & IEEE80211_FCTL_WEP) && |
| 625 | ieee80211_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt)) |
| 626 | goto rx_dropped; |
| 627 | |
| 628 | hdr = (struct ieee80211_hdr *) skb->data; |
| 629 | if (crypt && !(fc & IEEE80211_FCTL_WEP) && !ieee->open_wep) { |
| 630 | if (/*ieee->ieee802_1x &&*/ |
| 631 | ieee80211_is_eapol_frame(ieee, skb)) { |
| 632 | #ifdef CONFIG_IEEE80211_DEBUG |
| 633 | /* pass unencrypted EAPOL frames even if encryption is |
| 634 | * configured */ |
| 635 | struct eapol *eap = (struct eapol *)(skb->data + |
| 636 | 24); |
| 637 | IEEE80211_DEBUG_EAP("RX: IEEE 802.1X EAPOL frame: %s\n", |
| 638 | eap_get_type(eap->type)); |
| 639 | #endif |
| 640 | } else { |
| 641 | IEEE80211_DEBUG_DROP( |
| 642 | "encryption configured, but RX " |
| 643 | "frame not encrypted (SA=" MAC_FMT ")\n", |
| 644 | MAC_ARG(hdr->addr2)); |
| 645 | goto rx_dropped; |
| 646 | } |
| 647 | } |
| 648 | |
| 649 | #ifdef CONFIG_IEEE80211_DEBUG |
| 650 | if (crypt && !(fc & IEEE80211_FCTL_WEP) && |
| 651 | ieee80211_is_eapol_frame(ieee, skb)) { |
| 652 | struct eapol *eap = (struct eapol *)(skb->data + |
| 653 | 24); |
| 654 | IEEE80211_DEBUG_EAP("RX: IEEE 802.1X EAPOL frame: %s\n", |
| 655 | eap_get_type(eap->type)); |
| 656 | } |
| 657 | #endif |
| 658 | |
| 659 | if (crypt && !(fc & IEEE80211_FCTL_WEP) && !ieee->open_wep && |
| 660 | !ieee80211_is_eapol_frame(ieee, skb)) { |
| 661 | IEEE80211_DEBUG_DROP( |
| 662 | "dropped unencrypted RX data " |
| 663 | "frame from " MAC_FMT |
| 664 | " (drop_unencrypted=1)\n", |
| 665 | MAC_ARG(hdr->addr2)); |
| 666 | goto rx_dropped; |
| 667 | } |
| 668 | |
| 669 | /* skb: hdr + (possible reassembled) full plaintext payload */ |
| 670 | |
| 671 | payload = skb->data + hdrlen; |
| 672 | ethertype = (payload[6] << 8) | payload[7]; |
| 673 | |
| 674 | #ifdef NOT_YET |
| 675 | /* If IEEE 802.1X is used, check whether the port is authorized to send |
| 676 | * the received frame. */ |
| 677 | if (ieee->ieee802_1x && ieee->iw_mode == IW_MODE_MASTER) { |
| 678 | if (ethertype == ETH_P_PAE) { |
| 679 | printk(KERN_DEBUG "%s: RX: IEEE 802.1X frame\n", |
| 680 | dev->name); |
| 681 | if (ieee->hostapd && ieee->apdev) { |
| 682 | /* Send IEEE 802.1X frames to the user |
| 683 | * space daemon for processing */ |
| 684 | prism2_rx_80211(ieee->apdev, skb, rx_stats, |
| 685 | PRISM2_RX_MGMT); |
| 686 | ieee->apdevstats.rx_packets++; |
| 687 | ieee->apdevstats.rx_bytes += skb->len; |
| 688 | goto rx_exit; |
| 689 | } |
| 690 | } else if (!frame_authorized) { |
| 691 | printk(KERN_DEBUG "%s: dropped frame from " |
| 692 | "unauthorized port (IEEE 802.1X): " |
| 693 | "ethertype=0x%04x\n", |
| 694 | dev->name, ethertype); |
| 695 | goto rx_dropped; |
| 696 | } |
| 697 | } |
| 698 | #endif |
| 699 | |
| 700 | /* convert hdr + possible LLC headers into Ethernet header */ |
| 701 | if (skb->len - hdrlen >= 8 && |
| 702 | ((memcmp(payload, rfc1042_header, SNAP_SIZE) == 0 && |
| 703 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || |
| 704 | memcmp(payload, bridge_tunnel_header, SNAP_SIZE) == 0)) { |
| 705 | /* remove RFC1042 or Bridge-Tunnel encapsulation and |
| 706 | * replace EtherType */ |
| 707 | skb_pull(skb, hdrlen + SNAP_SIZE); |
| 708 | memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); |
| 709 | memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); |
| 710 | } else { |
| 711 | u16 len; |
| 712 | /* Leave Ethernet header part of hdr and full payload */ |
| 713 | skb_pull(skb, hdrlen); |
| 714 | len = htons(skb->len); |
| 715 | memcpy(skb_push(skb, 2), &len, 2); |
| 716 | memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); |
| 717 | memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); |
| 718 | } |
| 719 | |
| 720 | #ifdef NOT_YET |
| 721 | if (wds && ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == |
| 722 | IEEE80211_FCTL_TODS) && |
| 723 | skb->len >= ETH_HLEN + ETH_ALEN) { |
| 724 | /* Non-standard frame: get addr4 from its bogus location after |
| 725 | * the payload */ |
| 726 | memcpy(skb->data + ETH_ALEN, |
| 727 | skb->data + skb->len - ETH_ALEN, ETH_ALEN); |
| 728 | skb_trim(skb, skb->len - ETH_ALEN); |
| 729 | } |
| 730 | #endif |
| 731 | |
| 732 | stats->rx_packets++; |
| 733 | stats->rx_bytes += skb->len; |
| 734 | |
| 735 | #ifdef NOT_YET |
| 736 | if (ieee->iw_mode == IW_MODE_MASTER && !wds && |
| 737 | ieee->ap->bridge_packets) { |
| 738 | if (dst[0] & 0x01) { |
| 739 | /* copy multicast frame both to the higher layers and |
| 740 | * to the wireless media */ |
| 741 | ieee->ap->bridged_multicast++; |
| 742 | skb2 = skb_clone(skb, GFP_ATOMIC); |
| 743 | if (skb2 == NULL) |
| 744 | printk(KERN_DEBUG "%s: skb_clone failed for " |
| 745 | "multicast frame\n", dev->name); |
| 746 | } else if (hostap_is_sta_assoc(ieee->ap, dst)) { |
| 747 | /* send frame directly to the associated STA using |
| 748 | * wireless media and not passing to higher layers */ |
| 749 | ieee->ap->bridged_unicast++; |
| 750 | skb2 = skb; |
| 751 | skb = NULL; |
| 752 | } |
| 753 | } |
| 754 | |
| 755 | if (skb2 != NULL) { |
| 756 | /* send to wireless media */ |
| 757 | skb2->protocol = __constant_htons(ETH_P_802_3); |
| 758 | skb2->mac.raw = skb2->nh.raw = skb2->data; |
| 759 | /* skb2->nh.raw = skb2->data + ETH_HLEN; */ |
| 760 | skb2->dev = dev; |
| 761 | dev_queue_xmit(skb2); |
| 762 | } |
| 763 | |
| 764 | #endif |
| 765 | |
| 766 | if (skb) { |
| 767 | skb->protocol = eth_type_trans(skb, dev); |
| 768 | memset(skb->cb, 0, sizeof(skb->cb)); |
| 769 | skb->dev = dev; |
| 770 | skb->ip_summed = CHECKSUM_NONE; /* 802.11 crc not sufficient */ |
| 771 | netif_rx(skb); |
| 772 | } |
| 773 | |
| 774 | rx_exit: |
| 775 | #ifdef NOT_YET |
| 776 | if (sta) |
| 777 | hostap_handle_sta_release(sta); |
| 778 | #endif |
| 779 | return 1; |
| 780 | |
| 781 | rx_dropped: |
| 782 | stats->rx_dropped++; |
| 783 | |
| 784 | /* Returning 0 indicates to caller that we have not handled the SKB-- |
| 785 | * so it is still allocated and can be used again by underlying |
| 786 | * hardware as a DMA target */ |
| 787 | return 0; |
| 788 | } |
| 789 | |
| 790 | #define MGMT_FRAME_FIXED_PART_LENGTH 0x24 |
| 791 | |
| 792 | static inline int ieee80211_is_ofdm_rate(u8 rate) |
| 793 | { |
| 794 | switch (rate & ~IEEE80211_BASIC_RATE_MASK) { |
| 795 | case IEEE80211_OFDM_RATE_6MB: |
| 796 | case IEEE80211_OFDM_RATE_9MB: |
| 797 | case IEEE80211_OFDM_RATE_12MB: |
| 798 | case IEEE80211_OFDM_RATE_18MB: |
| 799 | case IEEE80211_OFDM_RATE_24MB: |
| 800 | case IEEE80211_OFDM_RATE_36MB: |
| 801 | case IEEE80211_OFDM_RATE_48MB: |
| 802 | case IEEE80211_OFDM_RATE_54MB: |
| 803 | return 1; |
| 804 | } |
| 805 | return 0; |
| 806 | } |
| 807 | |
| 808 | |
| 809 | static inline int ieee80211_network_init( |
| 810 | struct ieee80211_device *ieee, |
| 811 | struct ieee80211_probe_response *beacon, |
| 812 | struct ieee80211_network *network, |
| 813 | struct ieee80211_rx_stats *stats) |
| 814 | { |
| 815 | #ifdef CONFIG_IEEE80211_DEBUG |
| 816 | char rates_str[64]; |
| 817 | char *p; |
| 818 | #endif |
| 819 | struct ieee80211_info_element *info_element; |
| 820 | u16 left; |
| 821 | u8 i; |
| 822 | |
| 823 | /* Pull out fixed field data */ |
| 824 | memcpy(network->bssid, beacon->header.addr3, ETH_ALEN); |
| 825 | network->capability = beacon->capability; |
| 826 | network->last_scanned = jiffies; |
| 827 | network->time_stamp[0] = beacon->time_stamp[0]; |
| 828 | network->time_stamp[1] = beacon->time_stamp[1]; |
| 829 | network->beacon_interval = beacon->beacon_interval; |
| 830 | /* Where to pull this? beacon->listen_interval;*/ |
| 831 | network->listen_interval = 0x0A; |
| 832 | network->rates_len = network->rates_ex_len = 0; |
| 833 | network->last_associate = 0; |
| 834 | network->ssid_len = 0; |
| 835 | network->flags = 0; |
| 836 | network->atim_window = 0; |
| 837 | |
| 838 | if (stats->freq == IEEE80211_52GHZ_BAND) { |
| 839 | /* for A band (No DS info) */ |
| 840 | network->channel = stats->received_channel; |
| 841 | } else |
| 842 | network->flags |= NETWORK_HAS_CCK; |
| 843 | |
| 844 | network->wpa_ie_len = 0; |
| 845 | network->rsn_ie_len = 0; |
| 846 | |
| 847 | info_element = &beacon->info_element; |
| 848 | left = stats->len - ((void *)info_element - (void *)beacon); |
| 849 | while (left >= sizeof(struct ieee80211_info_element_hdr)) { |
| 850 | if (sizeof(struct ieee80211_info_element_hdr) + info_element->len > left) { |
| 851 | IEEE80211_DEBUG_SCAN("SCAN: parse failed: info_element->len + 2 > left : info_element->len+2=%d left=%d.\n", |
| 852 | info_element->len + sizeof(struct ieee80211_info_element), |
| 853 | left); |
| 854 | return 1; |
| 855 | } |
| 856 | |
| 857 | switch (info_element->id) { |
| 858 | case MFIE_TYPE_SSID: |
| 859 | if (ieee80211_is_empty_essid(info_element->data, |
| 860 | info_element->len)) { |
| 861 | network->flags |= NETWORK_EMPTY_ESSID; |
| 862 | break; |
| 863 | } |
| 864 | |
| 865 | network->ssid_len = min(info_element->len, |
| 866 | (u8)IW_ESSID_MAX_SIZE); |
| 867 | memcpy(network->ssid, info_element->data, network->ssid_len); |
| 868 | if (network->ssid_len < IW_ESSID_MAX_SIZE) |
| 869 | memset(network->ssid + network->ssid_len, 0, |
| 870 | IW_ESSID_MAX_SIZE - network->ssid_len); |
| 871 | |
| 872 | IEEE80211_DEBUG_SCAN("MFIE_TYPE_SSID: '%s' len=%d.\n", |
| 873 | network->ssid, network->ssid_len); |
| 874 | break; |
| 875 | |
| 876 | case MFIE_TYPE_RATES: |
| 877 | #ifdef CONFIG_IEEE80211_DEBUG |
| 878 | p = rates_str; |
| 879 | #endif |
| 880 | network->rates_len = min(info_element->len, MAX_RATES_LENGTH); |
| 881 | for (i = 0; i < network->rates_len; i++) { |
| 882 | network->rates[i] = info_element->data[i]; |
| 883 | #ifdef CONFIG_IEEE80211_DEBUG |
| 884 | p += snprintf(p, sizeof(rates_str) - (p - rates_str), "%02X ", network->rates[i]); |
| 885 | #endif |
| 886 | if (ieee80211_is_ofdm_rate(info_element->data[i])) { |
| 887 | network->flags |= NETWORK_HAS_OFDM; |
| 888 | if (info_element->data[i] & |
| 889 | IEEE80211_BASIC_RATE_MASK) |
| 890 | network->flags &= |
| 891 | ~NETWORK_HAS_CCK; |
| 892 | } |
| 893 | } |
| 894 | |
| 895 | IEEE80211_DEBUG_SCAN("MFIE_TYPE_RATES: '%s' (%d)\n", |
| 896 | rates_str, network->rates_len); |
| 897 | break; |
| 898 | |
| 899 | case MFIE_TYPE_RATES_EX: |
| 900 | #ifdef CONFIG_IEEE80211_DEBUG |
| 901 | p = rates_str; |
| 902 | #endif |
| 903 | network->rates_ex_len = min(info_element->len, MAX_RATES_EX_LENGTH); |
| 904 | for (i = 0; i < network->rates_ex_len; i++) { |
| 905 | network->rates_ex[i] = info_element->data[i]; |
| 906 | #ifdef CONFIG_IEEE80211_DEBUG |
| 907 | p += snprintf(p, sizeof(rates_str) - (p - rates_str), "%02X ", network->rates[i]); |
| 908 | #endif |
| 909 | if (ieee80211_is_ofdm_rate(info_element->data[i])) { |
| 910 | network->flags |= NETWORK_HAS_OFDM; |
| 911 | if (info_element->data[i] & |
| 912 | IEEE80211_BASIC_RATE_MASK) |
| 913 | network->flags &= |
| 914 | ~NETWORK_HAS_CCK; |
| 915 | } |
| 916 | } |
| 917 | |
| 918 | IEEE80211_DEBUG_SCAN("MFIE_TYPE_RATES_EX: '%s' (%d)\n", |
| 919 | rates_str, network->rates_ex_len); |
| 920 | break; |
| 921 | |
| 922 | case MFIE_TYPE_DS_SET: |
| 923 | IEEE80211_DEBUG_SCAN("MFIE_TYPE_DS_SET: %d\n", |
| 924 | info_element->data[0]); |
| 925 | if (stats->freq == IEEE80211_24GHZ_BAND) |
| 926 | network->channel = info_element->data[0]; |
| 927 | break; |
| 928 | |
| 929 | case MFIE_TYPE_FH_SET: |
| 930 | IEEE80211_DEBUG_SCAN("MFIE_TYPE_FH_SET: ignored\n"); |
| 931 | break; |
| 932 | |
| 933 | case MFIE_TYPE_CF_SET: |
| 934 | IEEE80211_DEBUG_SCAN("MFIE_TYPE_CF_SET: ignored\n"); |
| 935 | break; |
| 936 | |
| 937 | case MFIE_TYPE_TIM: |
| 938 | IEEE80211_DEBUG_SCAN("MFIE_TYPE_TIM: ignored\n"); |
| 939 | break; |
| 940 | |
| 941 | case MFIE_TYPE_IBSS_SET: |
| 942 | IEEE80211_DEBUG_SCAN("MFIE_TYPE_IBSS_SET: ignored\n"); |
| 943 | break; |
| 944 | |
| 945 | case MFIE_TYPE_CHALLENGE: |
| 946 | IEEE80211_DEBUG_SCAN("MFIE_TYPE_CHALLENGE: ignored\n"); |
| 947 | break; |
| 948 | |
| 949 | case MFIE_TYPE_GENERIC: |
| 950 | IEEE80211_DEBUG_SCAN("MFIE_TYPE_GENERIC: %d bytes\n", |
| 951 | info_element->len); |
| 952 | if (info_element->len >= 4 && |
| 953 | info_element->data[0] == 0x00 && |
| 954 | info_element->data[1] == 0x50 && |
| 955 | info_element->data[2] == 0xf2 && |
| 956 | info_element->data[3] == 0x01) { |
| 957 | network->wpa_ie_len = min(info_element->len + 2, |
| 958 | MAX_WPA_IE_LEN); |
| 959 | memcpy(network->wpa_ie, info_element, |
| 960 | network->wpa_ie_len); |
| 961 | } |
| 962 | break; |
| 963 | |
| 964 | case MFIE_TYPE_RSN: |
| 965 | IEEE80211_DEBUG_SCAN("MFIE_TYPE_RSN: %d bytes\n", |
| 966 | info_element->len); |
| 967 | network->rsn_ie_len = min(info_element->len + 2, |
| 968 | MAX_WPA_IE_LEN); |
| 969 | memcpy(network->rsn_ie, info_element, |
| 970 | network->rsn_ie_len); |
| 971 | break; |
| 972 | |
| 973 | default: |
| 974 | IEEE80211_DEBUG_SCAN("unsupported IE %d\n", |
| 975 | info_element->id); |
| 976 | break; |
| 977 | } |
| 978 | |
| 979 | left -= sizeof(struct ieee80211_info_element_hdr) + |
| 980 | info_element->len; |
| 981 | info_element = (struct ieee80211_info_element *) |
| 982 | &info_element->data[info_element->len]; |
| 983 | } |
| 984 | |
| 985 | network->mode = 0; |
| 986 | if (stats->freq == IEEE80211_52GHZ_BAND) |
| 987 | network->mode = IEEE_A; |
| 988 | else { |
| 989 | if (network->flags & NETWORK_HAS_OFDM) |
| 990 | network->mode |= IEEE_G; |
| 991 | if (network->flags & NETWORK_HAS_CCK) |
| 992 | network->mode |= IEEE_B; |
| 993 | } |
| 994 | |
| 995 | if (network->mode == 0) { |
| 996 | IEEE80211_DEBUG_SCAN("Filtered out '%s (" MAC_FMT ")' " |
| 997 | "network.\n", |
| 998 | escape_essid(network->ssid, |
| 999 | network->ssid_len), |
| 1000 | MAC_ARG(network->bssid)); |
| 1001 | return 1; |
| 1002 | } |
| 1003 | |
| 1004 | if (ieee80211_is_empty_essid(network->ssid, network->ssid_len)) |
| 1005 | network->flags |= NETWORK_EMPTY_ESSID; |
| 1006 | |
| 1007 | memcpy(&network->stats, stats, sizeof(network->stats)); |
| 1008 | |
| 1009 | return 0; |
| 1010 | } |
| 1011 | |
| 1012 | static inline int is_same_network(struct ieee80211_network *src, |
| 1013 | struct ieee80211_network *dst) |
| 1014 | { |
| 1015 | /* A network is only a duplicate if the channel, BSSID, and ESSID |
| 1016 | * all match. We treat all <hidden> with the same BSSID and channel |
| 1017 | * as one network */ |
| 1018 | return ((src->ssid_len == dst->ssid_len) && |
| 1019 | (src->channel == dst->channel) && |
| 1020 | !memcmp(src->bssid, dst->bssid, ETH_ALEN) && |
| 1021 | !memcmp(src->ssid, dst->ssid, src->ssid_len)); |
| 1022 | } |
| 1023 | |
| 1024 | static inline void update_network(struct ieee80211_network *dst, |
| 1025 | struct ieee80211_network *src) |
| 1026 | { |
| 1027 | memcpy(&dst->stats, &src->stats, sizeof(struct ieee80211_rx_stats)); |
| 1028 | dst->capability = src->capability; |
| 1029 | memcpy(dst->rates, src->rates, src->rates_len); |
| 1030 | dst->rates_len = src->rates_len; |
| 1031 | memcpy(dst->rates_ex, src->rates_ex, src->rates_ex_len); |
| 1032 | dst->rates_ex_len = src->rates_ex_len; |
| 1033 | |
| 1034 | dst->mode = src->mode; |
| 1035 | dst->flags = src->flags; |
| 1036 | dst->time_stamp[0] = src->time_stamp[0]; |
| 1037 | dst->time_stamp[1] = src->time_stamp[1]; |
| 1038 | |
| 1039 | dst->beacon_interval = src->beacon_interval; |
| 1040 | dst->listen_interval = src->listen_interval; |
| 1041 | dst->atim_window = src->atim_window; |
| 1042 | |
| 1043 | memcpy(dst->wpa_ie, src->wpa_ie, src->wpa_ie_len); |
| 1044 | dst->wpa_ie_len = src->wpa_ie_len; |
| 1045 | memcpy(dst->rsn_ie, src->rsn_ie, src->rsn_ie_len); |
| 1046 | dst->rsn_ie_len = src->rsn_ie_len; |
| 1047 | |
| 1048 | dst->last_scanned = jiffies; |
| 1049 | /* dst->last_associate is not overwritten */ |
| 1050 | } |
| 1051 | |
| 1052 | static inline void ieee80211_process_probe_response( |
| 1053 | struct ieee80211_device *ieee, |
| 1054 | struct ieee80211_probe_response *beacon, |
| 1055 | struct ieee80211_rx_stats *stats) |
| 1056 | { |
| 1057 | struct ieee80211_network network; |
| 1058 | struct ieee80211_network *target; |
| 1059 | struct ieee80211_network *oldest = NULL; |
| 1060 | #ifdef CONFIG_IEEE80211_DEBUG |
| 1061 | struct ieee80211_info_element *info_element = &beacon->info_element; |
| 1062 | #endif |
| 1063 | unsigned long flags; |
| 1064 | |
| 1065 | IEEE80211_DEBUG_SCAN( |
| 1066 | "'%s' (" MAC_FMT "): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n", |
| 1067 | escape_essid(info_element->data, info_element->len), |
| 1068 | MAC_ARG(beacon->header.addr3), |
| 1069 | (beacon->capability & (1<<0xf)) ? '1' : '0', |
| 1070 | (beacon->capability & (1<<0xe)) ? '1' : '0', |
| 1071 | (beacon->capability & (1<<0xd)) ? '1' : '0', |
| 1072 | (beacon->capability & (1<<0xc)) ? '1' : '0', |
| 1073 | (beacon->capability & (1<<0xb)) ? '1' : '0', |
| 1074 | (beacon->capability & (1<<0xa)) ? '1' : '0', |
| 1075 | (beacon->capability & (1<<0x9)) ? '1' : '0', |
| 1076 | (beacon->capability & (1<<0x8)) ? '1' : '0', |
| 1077 | (beacon->capability & (1<<0x7)) ? '1' : '0', |
| 1078 | (beacon->capability & (1<<0x6)) ? '1' : '0', |
| 1079 | (beacon->capability & (1<<0x5)) ? '1' : '0', |
| 1080 | (beacon->capability & (1<<0x4)) ? '1' : '0', |
| 1081 | (beacon->capability & (1<<0x3)) ? '1' : '0', |
| 1082 | (beacon->capability & (1<<0x2)) ? '1' : '0', |
| 1083 | (beacon->capability & (1<<0x1)) ? '1' : '0', |
| 1084 | (beacon->capability & (1<<0x0)) ? '1' : '0'); |
| 1085 | |
| 1086 | if (ieee80211_network_init(ieee, beacon, &network, stats)) { |
| 1087 | IEEE80211_DEBUG_SCAN("Dropped '%s' (" MAC_FMT ") via %s.\n", |
| 1088 | escape_essid(info_element->data, |
| 1089 | info_element->len), |
| 1090 | MAC_ARG(beacon->header.addr3), |
| 1091 | WLAN_FC_GET_STYPE(beacon->header.frame_ctl) == |
| 1092 | IEEE80211_STYPE_PROBE_RESP ? |
| 1093 | "PROBE RESPONSE" : "BEACON"); |
| 1094 | return; |
| 1095 | } |
| 1096 | |
| 1097 | /* The network parsed correctly -- so now we scan our known networks |
| 1098 | * to see if we can find it in our list. |
| 1099 | * |
| 1100 | * NOTE: This search is definitely not optimized. Once its doing |
| 1101 | * the "right thing" we'll optimize it for efficiency if |
| 1102 | * necessary */ |
| 1103 | |
| 1104 | /* Search for this entry in the list and update it if it is |
| 1105 | * already there. */ |
| 1106 | |
| 1107 | spin_lock_irqsave(&ieee->lock, flags); |
| 1108 | |
| 1109 | list_for_each_entry(target, &ieee->network_list, list) { |
| 1110 | if (is_same_network(target, &network)) |
| 1111 | break; |
| 1112 | |
| 1113 | if ((oldest == NULL) || |
| 1114 | (target->last_scanned < oldest->last_scanned)) |
| 1115 | oldest = target; |
| 1116 | } |
| 1117 | |
| 1118 | /* If we didn't find a match, then get a new network slot to initialize |
| 1119 | * with this beacon's information */ |
| 1120 | if (&target->list == &ieee->network_list) { |
| 1121 | if (list_empty(&ieee->network_free_list)) { |
| 1122 | /* If there are no more slots, expire the oldest */ |
| 1123 | list_del(&oldest->list); |
| 1124 | target = oldest; |
| 1125 | IEEE80211_DEBUG_SCAN("Expired '%s' (" MAC_FMT ") from " |
| 1126 | "network list.\n", |
| 1127 | escape_essid(target->ssid, |
| 1128 | target->ssid_len), |
| 1129 | MAC_ARG(target->bssid)); |
| 1130 | } else { |
| 1131 | /* Otherwise just pull from the free list */ |
| 1132 | target = list_entry(ieee->network_free_list.next, |
| 1133 | struct ieee80211_network, list); |
| 1134 | list_del(ieee->network_free_list.next); |
| 1135 | } |
| 1136 | |
| 1137 | |
| 1138 | #ifdef CONFIG_IEEE80211_DEBUG |
| 1139 | IEEE80211_DEBUG_SCAN("Adding '%s' (" MAC_FMT ") via %s.\n", |
| 1140 | escape_essid(network.ssid, |
| 1141 | network.ssid_len), |
| 1142 | MAC_ARG(network.bssid), |
| 1143 | WLAN_FC_GET_STYPE(beacon->header.frame_ctl) == |
| 1144 | IEEE80211_STYPE_PROBE_RESP ? |
| 1145 | "PROBE RESPONSE" : "BEACON"); |
| 1146 | #endif |
| 1147 | memcpy(target, &network, sizeof(*target)); |
| 1148 | list_add_tail(&target->list, &ieee->network_list); |
| 1149 | } else { |
| 1150 | IEEE80211_DEBUG_SCAN("Updating '%s' (" MAC_FMT ") via %s.\n", |
| 1151 | escape_essid(target->ssid, |
| 1152 | target->ssid_len), |
| 1153 | MAC_ARG(target->bssid), |
| 1154 | WLAN_FC_GET_STYPE(beacon->header.frame_ctl) == |
| 1155 | IEEE80211_STYPE_PROBE_RESP ? |
| 1156 | "PROBE RESPONSE" : "BEACON"); |
| 1157 | update_network(target, &network); |
| 1158 | } |
| 1159 | |
| 1160 | spin_unlock_irqrestore(&ieee->lock, flags); |
| 1161 | } |
| 1162 | |
| 1163 | void ieee80211_rx_mgt(struct ieee80211_device *ieee, |
| 1164 | struct ieee80211_hdr *header, |
| 1165 | struct ieee80211_rx_stats *stats) |
| 1166 | { |
| 1167 | switch (WLAN_FC_GET_STYPE(header->frame_ctl)) { |
| 1168 | case IEEE80211_STYPE_ASSOC_RESP: |
| 1169 | IEEE80211_DEBUG_MGMT("received ASSOCIATION RESPONSE (%d)\n", |
| 1170 | WLAN_FC_GET_STYPE(header->frame_ctl)); |
| 1171 | break; |
| 1172 | |
| 1173 | case IEEE80211_STYPE_REASSOC_RESP: |
| 1174 | IEEE80211_DEBUG_MGMT("received REASSOCIATION RESPONSE (%d)\n", |
| 1175 | WLAN_FC_GET_STYPE(header->frame_ctl)); |
| 1176 | break; |
| 1177 | |
| 1178 | case IEEE80211_STYPE_PROBE_RESP: |
| 1179 | IEEE80211_DEBUG_MGMT("received PROBE RESPONSE (%d)\n", |
| 1180 | WLAN_FC_GET_STYPE(header->frame_ctl)); |
| 1181 | IEEE80211_DEBUG_SCAN("Probe response\n"); |
| 1182 | ieee80211_process_probe_response( |
| 1183 | ieee, (struct ieee80211_probe_response *)header, stats); |
| 1184 | break; |
| 1185 | |
| 1186 | case IEEE80211_STYPE_BEACON: |
| 1187 | IEEE80211_DEBUG_MGMT("received BEACON (%d)\n", |
| 1188 | WLAN_FC_GET_STYPE(header->frame_ctl)); |
| 1189 | IEEE80211_DEBUG_SCAN("Beacon\n"); |
| 1190 | ieee80211_process_probe_response( |
| 1191 | ieee, (struct ieee80211_probe_response *)header, stats); |
| 1192 | break; |
| 1193 | |
| 1194 | default: |
| 1195 | IEEE80211_DEBUG_MGMT("received UNKNOWN (%d)\n", |
| 1196 | WLAN_FC_GET_STYPE(header->frame_ctl)); |
| 1197 | IEEE80211_WARNING("%s: Unknown management packet: %d\n", |
| 1198 | ieee->dev->name, |
| 1199 | WLAN_FC_GET_STYPE(header->frame_ctl)); |
| 1200 | break; |
| 1201 | } |
| 1202 | } |
| 1203 | |
| 1204 | |
| 1205 | EXPORT_SYMBOL(ieee80211_rx_mgt); |
| 1206 | EXPORT_SYMBOL(ieee80211_rx); |