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 * <j@w1.fi> 7 * Copyright (c) 2002-2003, Jouni Malinen <j@w1.fi> 8 * Copyright (c) 2004-2005, 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/errno.h> 18#include <linux/if_arp.h> 19#include <linux/in6.h> 20#include <linux/in.h> 21#include <linux/ip.h> 22#include <linux/kernel.h> 23#include <linux/module.h> 24#include <linux/netdevice.h> 25#include <linux/proc_fs.h> 26#include <linux/skbuff.h> 27#include <linux/slab.h> 28#include <linux/tcp.h> 29#include <linux/types.h> 30#include <linux/wireless.h> 31#include <linux/etherdevice.h> 32#include <asm/uaccess.h> 33#include <linux/ctype.h> 34 35#include <net/ieee80211.h> 36 37static void ieee80211_monitor_rx(struct ieee80211_device *ieee, 38 struct sk_buff *skb, 39 struct ieee80211_rx_stats *rx_stats) 40{ 41 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 42 u16 fc = le16_to_cpu(hdr->frame_ctl); 43 44 skb->dev = ieee->dev; 45 skb_reset_mac_header(skb); 46 skb_pull(skb, ieee80211_get_hdrlen(fc)); 47 skb->pkt_type = PACKET_OTHERHOST; 48 skb->protocol = __constant_htons(ETH_P_80211_RAW); 49 memset(skb->cb, 0, sizeof(skb->cb)); 50 netif_rx(skb); 51} 52 53/* Called only as a tasklet (software IRQ) */ 54static struct ieee80211_frag_entry *ieee80211_frag_cache_find(struct 55 ieee80211_device 56 *ieee, 57 unsigned int seq, 58 unsigned int frag, 59 u8 * src, 60 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("expiring fragment cache entry " 70 "seq=%u last_frag=%u\n", 71 entry->seq, entry->last_frag); 72 dev_kfree_skb_any(entry->skb); 73 entry->skb = NULL; 74 } 75 76 if (entry->skb != NULL && entry->seq == seq && 77 (entry->last_frag + 1 == frag || frag == -1) && 78 !compare_ether_addr(entry->src_addr, src) && 79 !compare_ether_addr(entry->dst_addr, dst)) 80 return entry; 81 } 82 83 return NULL; 84} 85 86/* Called only as a tasklet (software IRQ) */ 87static struct sk_buff *ieee80211_frag_cache_get(struct ieee80211_device *ieee, 88 struct ieee80211_hdr_4addr *hdr) 89{ 90 struct sk_buff *skb = NULL; 91 u16 sc; 92 unsigned int frag, seq; 93 struct ieee80211_frag_entry *entry; 94 95 sc = le16_to_cpu(hdr->seq_ctl); 96 frag = WLAN_GET_SEQ_FRAG(sc); 97 seq = WLAN_GET_SEQ_SEQ(sc); 98 99 if (frag == 0) { 100 /* Reserve enough space to fit maximum frame length */ 101 skb = dev_alloc_skb(ieee->dev->mtu + 102 sizeof(struct ieee80211_hdr_4addr) + 103 8 /* LLC */ + 104 2 /* alignment */ + 105 8 /* WEP */ + ETH_ALEN /* WDS */ ); 106 if (skb == NULL) 107 return NULL; 108 109 entry = &ieee->frag_cache[ieee->frag_next_idx]; 110 ieee->frag_next_idx++; 111 if (ieee->frag_next_idx >= IEEE80211_FRAG_CACHE_LEN) 112 ieee->frag_next_idx = 0; 113 114 if (entry->skb != NULL) 115 dev_kfree_skb_any(entry->skb); 116 117 entry->first_frag_time = jiffies; 118 entry->seq = seq; 119 entry->last_frag = frag; 120 entry->skb = skb; 121 memcpy(entry->src_addr, hdr->addr2, ETH_ALEN); 122 memcpy(entry->dst_addr, hdr->addr1, ETH_ALEN); 123 } else { 124 /* received a fragment of a frame for which the head fragment 125 * should have already been received */ 126 entry = ieee80211_frag_cache_find(ieee, seq, frag, hdr->addr2, 127 hdr->addr1); 128 if (entry != NULL) { 129 entry->last_frag = frag; 130 skb = entry->skb; 131 } 132 } 133 134 return skb; 135} 136 137/* Called only as a tasklet (software IRQ) */ 138static int ieee80211_frag_cache_invalidate(struct ieee80211_device *ieee, 139 struct ieee80211_hdr_4addr *hdr) 140{ 141 u16 sc; 142 unsigned int seq; 143 struct ieee80211_frag_entry *entry; 144 145 sc = le16_to_cpu(hdr->seq_ctl); 146 seq = WLAN_GET_SEQ_SEQ(sc); 147 148 entry = ieee80211_frag_cache_find(ieee, seq, -1, hdr->addr2, 149 hdr->addr1); 150 151 if (entry == NULL) { 152 IEEE80211_DEBUG_FRAG("could not invalidate fragment cache " 153 "entry (seq=%u)\n", seq); 154 return -1; 155 } 156 157 entry->skb = NULL; 158 return 0; 159} 160 161#ifdef NOT_YET 162/* ieee80211_rx_frame_mgtmt 163 * 164 * Responsible for handling management control frames 165 * 166 * Called by ieee80211_rx */ 167static int 168ieee80211_rx_frame_mgmt(struct ieee80211_device *ieee, struct sk_buff *skb, 169 struct ieee80211_rx_stats *rx_stats, u16 type, 170 u16 stype) 171{ 172 if (ieee->iw_mode == IW_MODE_MASTER) { 173 printk(KERN_DEBUG "%s: Master mode not yet suppported.\n", 174 ieee->dev->name); 175 return 0; 176/* 177 hostap_update_sta_ps(ieee, (struct hostap_ieee80211_hdr_4addr *) 178 skb->data);*/ 179 } 180 181 if (ieee->hostapd && type == WLAN_FC_TYPE_MGMT) { 182 if (stype == WLAN_FC_STYPE_BEACON && 183 ieee->iw_mode == IW_MODE_MASTER) { 184 struct sk_buff *skb2; 185 /* Process beacon frames also in kernel driver to 186 * update STA(AP) table statistics */ 187 skb2 = skb_clone(skb, GFP_ATOMIC); 188 if (skb2) 189 hostap_rx(skb2->dev, skb2, rx_stats); 190 } 191 192 /* send management frames to the user space daemon for 193 * processing */ 194 ieee->apdevstats.rx_packets++; 195 ieee->apdevstats.rx_bytes += skb->len; 196 prism2_rx_80211(ieee->apdev, skb, rx_stats, PRISM2_RX_MGMT); 197 return 0; 198 } 199 200 if (ieee->iw_mode == IW_MODE_MASTER) { 201 if (type != WLAN_FC_TYPE_MGMT && type != WLAN_FC_TYPE_CTRL) { 202 printk(KERN_DEBUG "%s: unknown management frame " 203 "(type=0x%02x, stype=0x%02x) dropped\n", 204 skb->dev->name, type, stype); 205 return -1; 206 } 207 208 hostap_rx(skb->dev, skb, rx_stats); 209 return 0; 210 } 211 212 printk(KERN_DEBUG "%s: hostap_rx_frame_mgmt: management frame " 213 "received in non-Host AP mode\n", skb->dev->name); 214 return -1; 215} 216#endif 217 218/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */ 219/* Ethernet-II snap header (RFC1042 for most EtherTypes) */ 220static unsigned char rfc1042_header[] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 }; 221 222/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */ 223static unsigned char bridge_tunnel_header[] = 224 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 }; 225/* No encapsulation header if EtherType < 0x600 (=length) */ 226 227/* Called by ieee80211_rx_frame_decrypt */ 228static int ieee80211_is_eapol_frame(struct ieee80211_device *ieee, 229 struct sk_buff *skb) 230{ 231 struct net_device *dev = ieee->dev; 232 u16 fc, ethertype; 233 struct ieee80211_hdr_3addr *hdr; 234 u8 *pos; 235 236 if (skb->len < 24) 237 return 0; 238 239 hdr = (struct ieee80211_hdr_3addr *)skb->data; 240 fc = le16_to_cpu(hdr->frame_ctl); 241 242 /* check that the frame is unicast frame to us */ 243 if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == 244 IEEE80211_FCTL_TODS && 245 !compare_ether_addr(hdr->addr1, dev->dev_addr) && 246 !compare_ether_addr(hdr->addr3, dev->dev_addr)) { 247 /* ToDS frame with own addr BSSID and DA */ 248 } else if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == 249 IEEE80211_FCTL_FROMDS && 250 !compare_ether_addr(hdr->addr1, dev->dev_addr)) { 251 /* FromDS frame with own addr as DA */ 252 } else 253 return 0; 254 255 if (skb->len < 24 + 8) 256 return 0; 257 258 /* check for port access entity Ethernet type */ 259 pos = skb->data + 24; 260 ethertype = (pos[6] << 8) | pos[7]; 261 if (ethertype == ETH_P_PAE) 262 return 1; 263 264 return 0; 265} 266 267/* Called only as a tasklet (software IRQ), by ieee80211_rx */ 268static int 269ieee80211_rx_frame_decrypt(struct ieee80211_device *ieee, struct sk_buff *skb, 270 struct ieee80211_crypt_data *crypt) 271{ 272 struct ieee80211_hdr_3addr *hdr; 273 int res, hdrlen; 274 275 if (crypt == NULL || crypt->ops->decrypt_mpdu == NULL) 276 return 0; 277 278 hdr = (struct ieee80211_hdr_3addr *)skb->data; 279 hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl)); 280 281 atomic_inc(&crypt->refcnt); 282 res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv); 283 atomic_dec(&crypt->refcnt); 284 if (res < 0) { 285 IEEE80211_DEBUG_DROP("decryption failed (SA=" MAC_FMT 286 ") res=%d\n", MAC_ARG(hdr->addr2), res); 287 if (res == -2) 288 IEEE80211_DEBUG_DROP("Decryption failed ICV " 289 "mismatch (key %d)\n", 290 skb->data[hdrlen + 3] >> 6); 291 ieee->ieee_stats.rx_discards_undecryptable++; 292 return -1; 293 } 294 295 return res; 296} 297 298/* Called only as a tasklet (software IRQ), by ieee80211_rx */ 299static int 300ieee80211_rx_frame_decrypt_msdu(struct ieee80211_device *ieee, 301 struct sk_buff *skb, int keyidx, 302 struct ieee80211_crypt_data *crypt) 303{ 304 struct ieee80211_hdr_3addr *hdr; 305 int res, hdrlen; 306 307 if (crypt == NULL || crypt->ops->decrypt_msdu == NULL) 308 return 0; 309 310 hdr = (struct ieee80211_hdr_3addr *)skb->data; 311 hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl)); 312 313 atomic_inc(&crypt->refcnt); 314 res = crypt->ops->decrypt_msdu(skb, keyidx, hdrlen, crypt->priv); 315 atomic_dec(&crypt->refcnt); 316 if (res < 0) { 317 printk(KERN_DEBUG "%s: MSDU decryption/MIC verification failed" 318 " (SA=" MAC_FMT " keyidx=%d)\n", 319 ieee->dev->name, MAC_ARG(hdr->addr2), keyidx); 320 return -1; 321 } 322 323 return 0; 324} 325 326/* All received frames are sent to this function. @skb contains the frame in 327 * IEEE 802.11 format, i.e., in the format it was sent over air. 328 * This function is called only as a tasklet (software IRQ). */ 329int ieee80211_rx(struct ieee80211_device *ieee, struct sk_buff *skb, 330 struct ieee80211_rx_stats *rx_stats) 331{ 332 struct net_device *dev = ieee->dev; 333 struct ieee80211_hdr_4addr *hdr; 334 size_t hdrlen; 335 u16 fc, type, stype, sc; 336 struct net_device_stats *stats; 337 unsigned int frag; 338 u8 *payload; 339 u16 ethertype; 340#ifdef NOT_YET 341 struct net_device *wds = NULL; 342 struct sk_buff *skb2 = NULL; 343 struct net_device *wds = NULL; 344 int frame_authorized = 0; 345 int from_assoc_ap = 0; 346 void *sta = NULL; 347#endif 348 u8 dst[ETH_ALEN]; 349 u8 src[ETH_ALEN]; 350 struct ieee80211_crypt_data *crypt = NULL; 351 int keyidx = 0; 352 int can_be_decrypted = 0; 353 354 hdr = (struct ieee80211_hdr_4addr *)skb->data; 355 stats = &ieee->stats; 356 357 if (skb->len < 10) { 358 printk(KERN_INFO "%s: SKB length < 10\n", dev->name); 359 goto rx_dropped; 360 } 361 362 fc = le16_to_cpu(hdr->frame_ctl); 363 type = WLAN_FC_GET_TYPE(fc); 364 stype = WLAN_FC_GET_STYPE(fc); 365 sc = le16_to_cpu(hdr->seq_ctl); 366 frag = WLAN_GET_SEQ_FRAG(sc); 367 hdrlen = ieee80211_get_hdrlen(fc); 368 369 /* Put this code here so that we avoid duplicating it in all 370 * Rx paths. - Jean II */ 371#ifdef CONFIG_WIRELESS_EXT 372#ifdef IW_WIRELESS_SPY /* defined in iw_handler.h */ 373 /* If spy monitoring on */ 374 if (ieee->spy_data.spy_number > 0) { 375 struct iw_quality wstats; 376 377 wstats.updated = 0; 378 if (rx_stats->mask & IEEE80211_STATMASK_RSSI) { 379 wstats.level = rx_stats->rssi; 380 wstats.updated |= IW_QUAL_LEVEL_UPDATED; 381 } else 382 wstats.updated |= IW_QUAL_LEVEL_INVALID; 383 384 if (rx_stats->mask & IEEE80211_STATMASK_NOISE) { 385 wstats.noise = rx_stats->noise; 386 wstats.updated |= IW_QUAL_NOISE_UPDATED; 387 } else 388 wstats.updated |= IW_QUAL_NOISE_INVALID; 389 390 if (rx_stats->mask & IEEE80211_STATMASK_SIGNAL) { 391 wstats.qual = rx_stats->signal; 392 wstats.updated |= IW_QUAL_QUAL_UPDATED; 393 } else 394 wstats.updated |= IW_QUAL_QUAL_INVALID; 395 396 /* Update spy records */ 397 wireless_spy_update(ieee->dev, hdr->addr2, &wstats); 398 } 399#endif /* IW_WIRELESS_SPY */ 400#endif /* CONFIG_WIRELESS_EXT */ 401 402#ifdef NOT_YET 403 hostap_update_rx_stats(local->ap, hdr, rx_stats); 404#endif 405 406 if (ieee->iw_mode == IW_MODE_MONITOR) { 407 stats->rx_packets++; 408 stats->rx_bytes += skb->len; 409 ieee80211_monitor_rx(ieee, skb, rx_stats); 410 return 1; 411 } 412 413 can_be_decrypted = (is_multicast_ether_addr(hdr->addr1) || 414 is_broadcast_ether_addr(hdr->addr2)) ? 415 ieee->host_mc_decrypt : ieee->host_decrypt; 416 417 if (can_be_decrypted) { 418 if (skb->len >= hdrlen + 3) { 419 /* Top two-bits of byte 3 are the key index */ 420 keyidx = skb->data[hdrlen + 3] >> 6; 421 } 422 423 /* ieee->crypt[] is WEP_KEY (4) in length. Given that keyidx 424 * is only allowed 2-bits of storage, no value of keyidx can 425 * be provided via above code that would result in keyidx 426 * being out of range */ 427 crypt = ieee->crypt[keyidx]; 428 429#ifdef NOT_YET 430 sta = NULL; 431 432 /* Use station specific key to override default keys if the 433 * receiver address is a unicast address ("individual RA"). If 434 * bcrx_sta_key parameter is set, station specific key is used 435 * even with broad/multicast targets (this is against IEEE 436 * 802.11, but makes it easier to use different keys with 437 * stations that do not support WEP key mapping). */ 438 439 if (!(hdr->addr1[0] & 0x01) || local->bcrx_sta_key) 440 (void)hostap_handle_sta_crypto(local, hdr, &crypt, 441 &sta); 442#endif 443 444 /* allow NULL decrypt to indicate an station specific override 445 * for default encryption */ 446 if (crypt && (crypt->ops == NULL || 447 crypt->ops->decrypt_mpdu == NULL)) 448 crypt = NULL; 449 450 if (!crypt && (fc & IEEE80211_FCTL_PROTECTED)) { 451 /* This seems to be triggered by some (multicast?) 452 * frames from other than current BSS, so just drop the 453 * frames silently instead of filling system log with 454 * these reports. */ 455 IEEE80211_DEBUG_DROP("Decryption failed (not set)" 456 " (SA=" MAC_FMT ")\n", 457 MAC_ARG(hdr->addr2)); 458 ieee->ieee_stats.rx_discards_undecryptable++; 459 goto rx_dropped; 460 } 461 } 462#ifdef NOT_YET 463 if (type != WLAN_FC_TYPE_DATA) { 464 if (type == WLAN_FC_TYPE_MGMT && stype == WLAN_FC_STYPE_AUTH && 465 fc & IEEE80211_FCTL_PROTECTED && ieee->host_decrypt && 466 (keyidx = hostap_rx_frame_decrypt(ieee, skb, crypt)) < 0) { 467 printk(KERN_DEBUG "%s: failed to decrypt mgmt::auth " 468 "from " MAC_FMT "\n", dev->name, 469 MAC_ARG(hdr->addr2)); 470 /* TODO: could inform hostapd about this so that it 471 * could send auth failure report */ 472 goto rx_dropped; 473 } 474 475 if (ieee80211_rx_frame_mgmt(ieee, skb, rx_stats, type, stype)) 476 goto rx_dropped; 477 else 478 goto rx_exit; 479 } 480#endif 481 /* drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.29) */ 482 if (sc == ieee->prev_seq_ctl) 483 goto rx_dropped; 484 else 485 ieee->prev_seq_ctl = sc; 486 487 /* Data frame - extract src/dst addresses */ 488 if (skb->len < IEEE80211_3ADDR_LEN) 489 goto rx_dropped; 490 491 switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) { 492 case IEEE80211_FCTL_FROMDS: 493 memcpy(dst, hdr->addr1, ETH_ALEN); 494 memcpy(src, hdr->addr3, ETH_ALEN); 495 break; 496 case IEEE80211_FCTL_TODS: 497 memcpy(dst, hdr->addr3, ETH_ALEN); 498 memcpy(src, hdr->addr2, ETH_ALEN); 499 break; 500 case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS: 501 if (skb->len < IEEE80211_4ADDR_LEN) 502 goto rx_dropped; 503 memcpy(dst, hdr->addr3, ETH_ALEN); 504 memcpy(src, hdr->addr4, ETH_ALEN); 505 break; 506 case 0: 507 memcpy(dst, hdr->addr1, ETH_ALEN); 508 memcpy(src, hdr->addr2, ETH_ALEN); 509 break; 510 } 511 512#ifdef NOT_YET 513 if (hostap_rx_frame_wds(ieee, hdr, fc, &wds)) 514 goto rx_dropped; 515 if (wds) { 516 skb->dev = dev = wds; 517 stats = hostap_get_stats(dev); 518 } 519 520 if (ieee->iw_mode == IW_MODE_MASTER && !wds && 521 (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == 522 IEEE80211_FCTL_FROMDS && ieee->stadev 523 && !compare_ether_addr(hdr->addr2, ieee->assoc_ap_addr)) { 524 /* Frame from BSSID of the AP for which we are a client */ 525 skb->dev = dev = ieee->stadev; 526 stats = hostap_get_stats(dev); 527 from_assoc_ap = 1; 528 } 529#endif 530 531 dev->last_rx = jiffies; 532 533#ifdef NOT_YET 534 if ((ieee->iw_mode == IW_MODE_MASTER || 535 ieee->iw_mode == IW_MODE_REPEAT) && !from_assoc_ap) { 536 switch (hostap_handle_sta_rx(ieee, dev, skb, rx_stats, 537 wds != NULL)) { 538 case AP_RX_CONTINUE_NOT_AUTHORIZED: 539 frame_authorized = 0; 540 break; 541 case AP_RX_CONTINUE: 542 frame_authorized = 1; 543 break; 544 case AP_RX_DROP: 545 goto rx_dropped; 546 case AP_RX_EXIT: 547 goto rx_exit; 548 } 549 } 550#endif 551 552 /* Nullfunc frames may have PS-bit set, so they must be passed to 553 * hostap_handle_sta_rx() before being dropped here. */ 554 555 stype &= ~IEEE80211_STYPE_QOS_DATA; 556 557 if (stype != IEEE80211_STYPE_DATA && 558 stype != IEEE80211_STYPE_DATA_CFACK && 559 stype != IEEE80211_STYPE_DATA_CFPOLL && 560 stype != IEEE80211_STYPE_DATA_CFACKPOLL) { 561 if (stype != IEEE80211_STYPE_NULLFUNC) 562 IEEE80211_DEBUG_DROP("RX: dropped data frame " 563 "with no data (type=0x%02x, " 564 "subtype=0x%02x, len=%d)\n", 565 type, stype, skb->len); 566 goto rx_dropped; 567 } 568 569 /* skb: hdr + (possibly fragmented, possibly encrypted) payload */ 570 571 if ((fc & IEEE80211_FCTL_PROTECTED) && can_be_decrypted && 572 (keyidx = ieee80211_rx_frame_decrypt(ieee, skb, crypt)) < 0) 573 goto rx_dropped; 574 575 hdr = (struct ieee80211_hdr_4addr *)skb->data; 576 577 /* skb: hdr + (possibly fragmented) plaintext payload */ 578 // ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) && 579 if ((frag != 0) || (fc & IEEE80211_FCTL_MOREFRAGS)) { 580 int flen; 581 struct sk_buff *frag_skb = ieee80211_frag_cache_get(ieee, hdr); 582 IEEE80211_DEBUG_FRAG("Rx Fragment received (%u)\n", frag); 583 584 if (!frag_skb) { 585 IEEE80211_DEBUG(IEEE80211_DL_RX | IEEE80211_DL_FRAG, 586 "Rx cannot get skb from fragment " 587 "cache (morefrag=%d seq=%u frag=%u)\n", 588 (fc & IEEE80211_FCTL_MOREFRAGS) != 0, 589 WLAN_GET_SEQ_SEQ(sc), frag); 590 goto rx_dropped; 591 } 592 593 flen = skb->len; 594 if (frag != 0) 595 flen -= hdrlen; 596 597 if (frag_skb->tail + flen > frag_skb->end) { 598 printk(KERN_WARNING "%s: host decrypted and " 599 "reassembled frame did not fit skb\n", 600 dev->name); 601 ieee80211_frag_cache_invalidate(ieee, hdr); 602 goto rx_dropped; 603 } 604 605 if (frag == 0) { 606 /* copy first fragment (including full headers) into 607 * beginning of the fragment cache skb */ 608 skb_copy_from_linear_data(skb, skb_put(frag_skb, flen), flen); 609 } else { 610 /* append frame payload to the end of the fragment 611 * cache skb */ 612 skb_copy_from_linear_data_offset(skb, hdrlen, 613 skb_put(frag_skb, flen), flen); 614 } 615 dev_kfree_skb_any(skb); 616 skb = NULL; 617 618 if (fc & IEEE80211_FCTL_MOREFRAGS) { 619 /* more fragments expected - leave the skb in fragment 620 * cache for now; it will be delivered to upper layers 621 * after all fragments have been received */ 622 goto rx_exit; 623 } 624 625 /* this was the last fragment and the frame will be 626 * delivered, so remove skb from fragment cache */ 627 skb = frag_skb; 628 hdr = (struct ieee80211_hdr_4addr *)skb->data; 629 ieee80211_frag_cache_invalidate(ieee, hdr); 630 } 631 632 /* skb: hdr + (possible reassembled) full MSDU payload; possibly still 633 * encrypted/authenticated */ 634 if ((fc & IEEE80211_FCTL_PROTECTED) && can_be_decrypted && 635 ieee80211_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt)) 636 goto rx_dropped; 637 638 hdr = (struct ieee80211_hdr_4addr *)skb->data; 639 if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep) { 640 if ( /*ieee->ieee802_1x && */ 641 ieee80211_is_eapol_frame(ieee, skb)) { 642 /* pass unencrypted EAPOL frames even if encryption is 643 * configured */ 644 } else { 645 IEEE80211_DEBUG_DROP("encryption configured, but RX " 646 "frame not encrypted (SA=" MAC_FMT 647 ")\n", MAC_ARG(hdr->addr2)); 648 goto rx_dropped; 649 } 650 } 651 652 if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep && 653 !ieee80211_is_eapol_frame(ieee, skb)) { 654 IEEE80211_DEBUG_DROP("dropped unencrypted RX data " 655 "frame from " MAC_FMT 656 " (drop_unencrypted=1)\n", 657 MAC_ARG(hdr->addr2)); 658 goto rx_dropped; 659 } 660 661 /* If the frame was decrypted in hardware, we may need to strip off 662 * any security data (IV, ICV, etc) that was left behind */ 663 if (!can_be_decrypted && (fc & IEEE80211_FCTL_PROTECTED) && 664 ieee->host_strip_iv_icv) { 665 int trimlen = 0; 666 667 /* Top two-bits of byte 3 are the key index */ 668 if (skb->len >= hdrlen + 3) 669 keyidx = skb->data[hdrlen + 3] >> 6; 670 671 /* To strip off any security data which appears before the 672 * payload, we simply increase hdrlen (as the header gets 673 * chopped off immediately below). For the security data which 674 * appears after the payload, we use skb_trim. */ 675 676 switch (ieee->sec.encode_alg[keyidx]) { 677 case SEC_ALG_WEP: 678 /* 4 byte IV */ 679 hdrlen += 4; 680 /* 4 byte ICV */ 681 trimlen = 4; 682 break; 683 case SEC_ALG_TKIP: 684 /* 4 byte IV, 4 byte ExtIV */ 685 hdrlen += 8; 686 /* 8 byte MIC, 4 byte ICV */ 687 trimlen = 12; 688 break; 689 case SEC_ALG_CCMP: 690 /* 8 byte CCMP header */ 691 hdrlen += 8; 692 /* 8 byte MIC */ 693 trimlen = 8; 694 break; 695 } 696 697 if (skb->len < trimlen) 698 goto rx_dropped; 699 700 __skb_trim(skb, skb->len - trimlen); 701 702 if (skb->len < hdrlen) 703 goto rx_dropped; 704 } 705 706 /* skb: hdr + (possible reassembled) full plaintext payload */ 707 708 payload = skb->data + hdrlen; 709 ethertype = (payload[6] << 8) | payload[7]; 710 711#ifdef NOT_YET 712 /* If IEEE 802.1X is used, check whether the port is authorized to send 713 * the received frame. */ 714 if (ieee->ieee802_1x && ieee->iw_mode == IW_MODE_MASTER) { 715 if (ethertype == ETH_P_PAE) { 716 printk(KERN_DEBUG "%s: RX: IEEE 802.1X frame\n", 717 dev->name); 718 if (ieee->hostapd && ieee->apdev) { 719 /* Send IEEE 802.1X frames to the user 720 * space daemon for processing */ 721 prism2_rx_80211(ieee->apdev, skb, rx_stats, 722 PRISM2_RX_MGMT); 723 ieee->apdevstats.rx_packets++; 724 ieee->apdevstats.rx_bytes += skb->len; 725 goto rx_exit; 726 } 727 } else if (!frame_authorized) { 728 printk(KERN_DEBUG "%s: dropped frame from " 729 "unauthorized port (IEEE 802.1X): " 730 "ethertype=0x%04x\n", dev->name, ethertype); 731 goto rx_dropped; 732 } 733 } 734#endif 735 736 /* convert hdr + possible LLC headers into Ethernet header */ 737 if (skb->len - hdrlen >= 8 && 738 ((memcmp(payload, rfc1042_header, SNAP_SIZE) == 0 && 739 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || 740 memcmp(payload, bridge_tunnel_header, SNAP_SIZE) == 0)) { 741 /* remove RFC1042 or Bridge-Tunnel encapsulation and 742 * replace EtherType */ 743 skb_pull(skb, hdrlen + SNAP_SIZE); 744 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); 745 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); 746 } else { 747 u16 len; 748 /* Leave Ethernet header part of hdr and full payload */ 749 skb_pull(skb, hdrlen); 750 len = htons(skb->len); 751 memcpy(skb_push(skb, 2), &len, 2); 752 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); 753 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); 754 } 755 756#ifdef NOT_YET 757 if (wds && ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == 758 IEEE80211_FCTL_TODS) && skb->len >= ETH_HLEN + ETH_ALEN) { 759 /* Non-standard frame: get addr4 from its bogus location after 760 * the payload */ 761 skb_copy_to_linear_data_offset(skb, ETH_ALEN, 762 skb->data + skb->len - ETH_ALEN, 763 ETH_ALEN); 764 skb_trim(skb, skb->len - ETH_ALEN); 765 } 766#endif 767 768 stats->rx_packets++; 769 stats->rx_bytes += skb->len; 770 771#ifdef NOT_YET 772 if (ieee->iw_mode == IW_MODE_MASTER && !wds && ieee->ap->bridge_packets) { 773 if (dst[0] & 0x01) { 774 /* copy multicast frame both to the higher layers and 775 * to the wireless media */ 776 ieee->ap->bridged_multicast++; 777 skb2 = skb_clone(skb, GFP_ATOMIC); 778 if (skb2 == NULL) 779 printk(KERN_DEBUG "%s: skb_clone failed for " 780 "multicast frame\n", dev->name); 781 } else if (hostap_is_sta_assoc(ieee->ap, dst)) { 782 /* send frame directly to the associated STA using 783 * wireless media and not passing to higher layers */ 784 ieee->ap->bridged_unicast++; 785 skb2 = skb; 786 skb = NULL; 787 } 788 } 789 790 if (skb2 != NULL) { 791 /* send to wireless media */ 792 skb2->dev = dev; 793 skb2->protocol = __constant_htons(ETH_P_802_3); 794 skb_reset_mac_header(skb2); 795 skb_reset_network_header(skb2); 796 /* skb2->network_header += ETH_HLEN; */ 797 dev_queue_xmit(skb2); 798 } 799#endif 800 801 if (skb) { 802 skb->protocol = eth_type_trans(skb, dev); 803 memset(skb->cb, 0, sizeof(skb->cb)); 804 skb->ip_summed = CHECKSUM_NONE; /* 802.11 crc not sufficient */ 805 if (netif_rx(skb) == NET_RX_DROP) { 806 /* netif_rx always succeeds, but it might drop 807 * the packet. If it drops the packet, we log that 808 * in our stats. */ 809 IEEE80211_DEBUG_DROP 810 ("RX: netif_rx dropped the packet\n"); 811 stats->rx_dropped++; 812 } 813 } 814 815 rx_exit: 816#ifdef NOT_YET 817 if (sta) 818 hostap_handle_sta_release(sta); 819#endif 820 return 1; 821 822 rx_dropped: 823 stats->rx_dropped++; 824 825 /* Returning 0 indicates to caller that we have not handled the SKB-- 826 * so it is still allocated and can be used again by underlying 827 * hardware as a DMA target */ 828 return 0; 829} 830 831/* Filter out unrelated packets, call ieee80211_rx[_mgt] 832 * This function takes over the skb, it should not be used again after calling 833 * this function. */ 834void ieee80211_rx_any(struct ieee80211_device *ieee, 835 struct sk_buff *skb, struct ieee80211_rx_stats *stats) 836{ 837 struct ieee80211_hdr_4addr *hdr; 838 int is_packet_for_us; 839 u16 fc; 840 841 if (ieee->iw_mode == IW_MODE_MONITOR) { 842 if (!ieee80211_rx(ieee, skb, stats)) 843 dev_kfree_skb_irq(skb); 844 return; 845 } 846 847 if (skb->len < sizeof(struct ieee80211_hdr)) 848 goto drop_free; 849 850 hdr = (struct ieee80211_hdr_4addr *)skb->data; 851 fc = le16_to_cpu(hdr->frame_ctl); 852 853 if ((fc & IEEE80211_FCTL_VERS) != 0) 854 goto drop_free; 855 856 switch (fc & IEEE80211_FCTL_FTYPE) { 857 case IEEE80211_FTYPE_MGMT: 858 if (skb->len < sizeof(struct ieee80211_hdr_3addr)) 859 goto drop_free; 860 ieee80211_rx_mgt(ieee, hdr, stats); 861 dev_kfree_skb_irq(skb); 862 return; 863 case IEEE80211_FTYPE_DATA: 864 break; 865 case IEEE80211_FTYPE_CTL: 866 return; 867 default: 868 return; 869 } 870 871 is_packet_for_us = 0; 872 switch (ieee->iw_mode) { 873 case IW_MODE_ADHOC: 874 /* our BSS and not from/to DS */ 875 if (memcmp(hdr->addr3, ieee->bssid, ETH_ALEN) == 0) 876 if ((fc & (IEEE80211_FCTL_TODS+IEEE80211_FCTL_FROMDS)) == 0) { 877 /* promisc: get all */ 878 if (ieee->dev->flags & IFF_PROMISC) 879 is_packet_for_us = 1; 880 /* to us */ 881 else if (memcmp(hdr->addr1, ieee->dev->dev_addr, ETH_ALEN) == 0) 882 is_packet_for_us = 1; 883 /* mcast */ 884 else if (is_multicast_ether_addr(hdr->addr1)) 885 is_packet_for_us = 1; 886 } 887 break; 888 case IW_MODE_INFRA: 889 /* our BSS (== from our AP) and from DS */ 890 if (memcmp(hdr->addr2, ieee->bssid, ETH_ALEN) == 0) 891 if ((fc & (IEEE80211_FCTL_TODS+IEEE80211_FCTL_FROMDS)) == IEEE80211_FCTL_FROMDS) { 892 /* promisc: get all */ 893 if (ieee->dev->flags & IFF_PROMISC) 894 is_packet_for_us = 1; 895 /* to us */ 896 else if (memcmp(hdr->addr1, ieee->dev->dev_addr, ETH_ALEN) == 0) 897 is_packet_for_us = 1; 898 /* mcast */ 899 else if (is_multicast_ether_addr(hdr->addr1)) { 900 /* not our own packet bcasted from AP */ 901 if (memcmp(hdr->addr3, ieee->dev->dev_addr, ETH_ALEN)) 902 is_packet_for_us = 1; 903 } 904 } 905 break; 906 default: 907 /* ? */ 908 break; 909 } 910 911 if (is_packet_for_us) 912 if (!ieee80211_rx(ieee, skb, stats)) 913 dev_kfree_skb_irq(skb); 914 return; 915 916drop_free: 917 dev_kfree_skb_irq(skb); 918 ieee->stats.rx_dropped++; 919 return; 920} 921 922#define MGMT_FRAME_FIXED_PART_LENGTH 0x24 923 924static u8 qos_oui[QOS_OUI_LEN] = { 0x00, 0x50, 0xF2 }; 925 926/* 927* Make ther structure we read from the beacon packet has 928* the right values 929*/ 930static int ieee80211_verify_qos_info(struct ieee80211_qos_information_element 931 *info_element, int sub_type) 932{ 933 934 if (info_element->qui_subtype != sub_type) 935 return -1; 936 if (memcmp(info_element->qui, qos_oui, QOS_OUI_LEN)) 937 return -1; 938 if (info_element->qui_type != QOS_OUI_TYPE) 939 return -1; 940 if (info_element->version != QOS_VERSION_1) 941 return -1; 942 943 return 0; 944} 945 946/* 947 * Parse a QoS parameter element 948 */ 949static int ieee80211_read_qos_param_element(struct ieee80211_qos_parameter_info 950 *element_param, struct ieee80211_info_element 951 *info_element) 952{ 953 int ret = 0; 954 u16 size = sizeof(struct ieee80211_qos_parameter_info) - 2; 955 956 if ((info_element == NULL) || (element_param == NULL)) 957 return -1; 958 959 if (info_element->id == QOS_ELEMENT_ID && info_element->len == size) { 960 memcpy(element_param->info_element.qui, info_element->data, 961 info_element->len); 962 element_param->info_element.elementID = info_element->id; 963 element_param->info_element.length = info_element->len; 964 } else 965 ret = -1; 966 if (ret == 0) 967 ret = ieee80211_verify_qos_info(&element_param->info_element, 968 QOS_OUI_PARAM_SUB_TYPE); 969 return ret; 970} 971 972/* 973 * Parse a QoS information element 974 */ 975static int ieee80211_read_qos_info_element(struct 976 ieee80211_qos_information_element 977 *element_info, struct ieee80211_info_element 978 *info_element) 979{ 980 int ret = 0; 981 u16 size = sizeof(struct ieee80211_qos_information_element) - 2; 982 983 if (element_info == NULL) 984 return -1; 985 if (info_element == NULL) 986 return -1; 987 988 if ((info_element->id == QOS_ELEMENT_ID) && (info_element->len == size)) { 989 memcpy(element_info->qui, info_element->data, 990 info_element->len); 991 element_info->elementID = info_element->id; 992 element_info->length = info_element->len; 993 } else 994 ret = -1; 995 996 if (ret == 0) 997 ret = ieee80211_verify_qos_info(element_info, 998 QOS_OUI_INFO_SUB_TYPE); 999 return ret; 1000} 1001 1002/* 1003 * Write QoS parameters from the ac parameters. 1004 */ 1005static int ieee80211_qos_convert_ac_to_parameters(struct 1006 ieee80211_qos_parameter_info 1007 *param_elm, struct 1008 ieee80211_qos_parameters 1009 *qos_param) 1010{ 1011 int rc = 0; 1012 int i; 1013 struct ieee80211_qos_ac_parameter *ac_params; 1014 u32 txop; 1015 u8 cw_min; 1016 u8 cw_max; 1017 1018 for (i = 0; i < QOS_QUEUE_NUM; i++) { 1019 ac_params = &(param_elm->ac_params_record[i]); 1020 1021 qos_param->aifs[i] = (ac_params->aci_aifsn) & 0x0F; 1022 qos_param->aifs[i] -= (qos_param->aifs[i] < 2) ? 0 : 2; 1023 1024 cw_min = ac_params->ecw_min_max & 0x0F; 1025 qos_param->cw_min[i] = (u16) ((1 << cw_min) - 1); 1026 1027 cw_max = (ac_params->ecw_min_max & 0xF0) >> 4; 1028 qos_param->cw_max[i] = (u16) ((1 << cw_max) - 1); 1029 1030 qos_param->flag[i] = 1031 (ac_params->aci_aifsn & 0x10) ? 0x01 : 0x00; 1032 1033 txop = le16_to_cpu(ac_params->tx_op_limit) * 32; 1034 qos_param->tx_op_limit[i] = (u16) txop; 1035 } 1036 return rc; 1037} 1038 1039/* 1040 * we have a generic data element which it may contain QoS information or 1041 * parameters element. check the information element length to decide 1042 * which type to read 1043 */ 1044static int ieee80211_parse_qos_info_param_IE(struct ieee80211_info_element 1045 *info_element, 1046 struct ieee80211_network *network) 1047{ 1048 int rc = 0; 1049 struct ieee80211_qos_parameters *qos_param = NULL; 1050 struct ieee80211_qos_information_element qos_info_element; 1051 1052 rc = ieee80211_read_qos_info_element(&qos_info_element, info_element); 1053 1054 if (rc == 0) { 1055 network->qos_data.param_count = qos_info_element.ac_info & 0x0F; 1056 network->flags |= NETWORK_HAS_QOS_INFORMATION; 1057 } else { 1058 struct ieee80211_qos_parameter_info param_element; 1059 1060 rc = ieee80211_read_qos_param_element(¶m_element, 1061 info_element); 1062 if (rc == 0) { 1063 qos_param = &(network->qos_data.parameters); 1064 ieee80211_qos_convert_ac_to_parameters(¶m_element, 1065 qos_param); 1066 network->flags |= NETWORK_HAS_QOS_PARAMETERS; 1067 network->qos_data.param_count = 1068 param_element.info_element.ac_info & 0x0F; 1069 } 1070 } 1071 1072 if (rc == 0) { 1073 IEEE80211_DEBUG_QOS("QoS is supported\n"); 1074 network->qos_data.supported = 1; 1075 } 1076 return rc; 1077} 1078 1079#ifdef CONFIG_IEEE80211_DEBUG 1080#define MFIE_STRING(x) case MFIE_TYPE_ ##x: return #x 1081 1082static const char *get_info_element_string(u16 id) 1083{ 1084 switch (id) { 1085 MFIE_STRING(SSID); 1086 MFIE_STRING(RATES); 1087 MFIE_STRING(FH_SET); 1088 MFIE_STRING(DS_SET); 1089 MFIE_STRING(CF_SET); 1090 MFIE_STRING(TIM); 1091 MFIE_STRING(IBSS_SET); 1092 MFIE_STRING(COUNTRY); 1093 MFIE_STRING(HOP_PARAMS); 1094 MFIE_STRING(HOP_TABLE); 1095 MFIE_STRING(REQUEST); 1096 MFIE_STRING(CHALLENGE); 1097 MFIE_STRING(POWER_CONSTRAINT); 1098 MFIE_STRING(POWER_CAPABILITY); 1099 MFIE_STRING(TPC_REQUEST); 1100 MFIE_STRING(TPC_REPORT); 1101 MFIE_STRING(SUPP_CHANNELS); 1102 MFIE_STRING(CSA); 1103 MFIE_STRING(MEASURE_REQUEST); 1104 MFIE_STRING(MEASURE_REPORT); 1105 MFIE_STRING(QUIET); 1106 MFIE_STRING(IBSS_DFS); 1107 MFIE_STRING(ERP_INFO); 1108 MFIE_STRING(RSN); 1109 MFIE_STRING(RATES_EX); 1110 MFIE_STRING(GENERIC); 1111 MFIE_STRING(QOS_PARAMETER); 1112 default: 1113 return "UNKNOWN"; 1114 } 1115} 1116#endif 1117 1118static int ieee80211_parse_info_param(struct ieee80211_info_element 1119 *info_element, u16 length, 1120 struct ieee80211_network *network) 1121{ 1122 u8 i; 1123#ifdef CONFIG_IEEE80211_DEBUG 1124 char rates_str[64]; 1125 char *p; 1126#endif 1127 1128 while (length >= sizeof(*info_element)) { 1129 if (sizeof(*info_element) + info_element->len > length) { 1130 IEEE80211_DEBUG_MGMT("Info elem: parse failed: " 1131 "info_element->len + 2 > left : " 1132 "info_element->len+2=%zd left=%d, id=%d.\n", 1133 info_element->len + 1134 sizeof(*info_element), 1135 length, info_element->id); 1136 /* We stop processing but don't return an error here 1137 * because some misbehaviour APs break this rule. ie. 1138 * Orinoco AP1000. */ 1139 break; 1140 } 1141 1142 switch (info_element->id) { 1143 case MFIE_TYPE_SSID: 1144 if (ieee80211_is_empty_essid(info_element->data, 1145 info_element->len)) { 1146 network->flags |= NETWORK_EMPTY_ESSID; 1147 break; 1148 } 1149 1150 network->ssid_len = min(info_element->len, 1151 (u8) IW_ESSID_MAX_SIZE); 1152 memcpy(network->ssid, info_element->data, 1153 network->ssid_len); 1154 if (network->ssid_len < IW_ESSID_MAX_SIZE) 1155 memset(network->ssid + network->ssid_len, 0, 1156 IW_ESSID_MAX_SIZE - network->ssid_len); 1157 1158 IEEE80211_DEBUG_MGMT("MFIE_TYPE_SSID: '%s' len=%d.\n", 1159 network->ssid, network->ssid_len); 1160 break; 1161 1162 case MFIE_TYPE_RATES: 1163#ifdef CONFIG_IEEE80211_DEBUG 1164 p = rates_str; 1165#endif 1166 network->rates_len = min(info_element->len, 1167 MAX_RATES_LENGTH); 1168 for (i = 0; i < network->rates_len; i++) { 1169 network->rates[i] = info_element->data[i]; 1170#ifdef CONFIG_IEEE80211_DEBUG 1171 p += snprintf(p, sizeof(rates_str) - 1172 (p - rates_str), "%02X ", 1173 network->rates[i]); 1174#endif 1175 if (ieee80211_is_ofdm_rate 1176 (info_element->data[i])) { 1177 network->flags |= NETWORK_HAS_OFDM; 1178 if (info_element->data[i] & 1179 IEEE80211_BASIC_RATE_MASK) 1180 network->flags &= 1181 ~NETWORK_HAS_CCK; 1182 } 1183 } 1184 1185 IEEE80211_DEBUG_MGMT("MFIE_TYPE_RATES: '%s' (%d)\n", 1186 rates_str, network->rates_len); 1187 break; 1188 1189 case MFIE_TYPE_RATES_EX: 1190#ifdef CONFIG_IEEE80211_DEBUG 1191 p = rates_str; 1192#endif 1193 network->rates_ex_len = min(info_element->len, 1194 MAX_RATES_EX_LENGTH); 1195 for (i = 0; i < network->rates_ex_len; i++) { 1196 network->rates_ex[i] = info_element->data[i]; 1197#ifdef CONFIG_IEEE80211_DEBUG 1198 p += snprintf(p, sizeof(rates_str) - 1199 (p - rates_str), "%02X ", 1200 network->rates[i]); 1201#endif 1202 if (ieee80211_is_ofdm_rate 1203 (info_element->data[i])) { 1204 network->flags |= NETWORK_HAS_OFDM; 1205 if (info_element->data[i] & 1206 IEEE80211_BASIC_RATE_MASK) 1207 network->flags &= 1208 ~NETWORK_HAS_CCK; 1209 } 1210 } 1211 1212 IEEE80211_DEBUG_MGMT("MFIE_TYPE_RATES_EX: '%s' (%d)\n", 1213 rates_str, network->rates_ex_len); 1214 break; 1215 1216 case MFIE_TYPE_DS_SET: 1217 IEEE80211_DEBUG_MGMT("MFIE_TYPE_DS_SET: %d\n", 1218 info_element->data[0]); 1219 network->channel = info_element->data[0]; 1220 break; 1221 1222 case MFIE_TYPE_FH_SET: 1223 IEEE80211_DEBUG_MGMT("MFIE_TYPE_FH_SET: ignored\n"); 1224 break; 1225 1226 case MFIE_TYPE_CF_SET: 1227 IEEE80211_DEBUG_MGMT("MFIE_TYPE_CF_SET: ignored\n"); 1228 break; 1229 1230 case MFIE_TYPE_TIM: 1231 network->tim.tim_count = info_element->data[0]; 1232 network->tim.tim_period = info_element->data[1]; 1233 IEEE80211_DEBUG_MGMT("MFIE_TYPE_TIM: partially ignored\n"); 1234 break; 1235 1236 case MFIE_TYPE_ERP_INFO: 1237 network->erp_value = info_element->data[0]; 1238 network->flags |= NETWORK_HAS_ERP_VALUE; 1239 IEEE80211_DEBUG_MGMT("MFIE_TYPE_ERP_SET: %d\n", 1240 network->erp_value); 1241 break; 1242 1243 case MFIE_TYPE_IBSS_SET: 1244 network->atim_window = info_element->data[0]; 1245 IEEE80211_DEBUG_MGMT("MFIE_TYPE_IBSS_SET: %d\n", 1246 network->atim_window); 1247 break; 1248 1249 case MFIE_TYPE_CHALLENGE: 1250 IEEE80211_DEBUG_MGMT("MFIE_TYPE_CHALLENGE: ignored\n"); 1251 break; 1252 1253 case MFIE_TYPE_GENERIC: 1254 IEEE80211_DEBUG_MGMT("MFIE_TYPE_GENERIC: %d bytes\n", 1255 info_element->len); 1256 if (!ieee80211_parse_qos_info_param_IE(info_element, 1257 network)) 1258 break; 1259 1260 if (info_element->len >= 4 && 1261 info_element->data[0] == 0x00 && 1262 info_element->data[1] == 0x50 && 1263 info_element->data[2] == 0xf2 && 1264 info_element->data[3] == 0x01) { 1265 network->wpa_ie_len = min(info_element->len + 2, 1266 MAX_WPA_IE_LEN); 1267 memcpy(network->wpa_ie, info_element, 1268 network->wpa_ie_len); 1269 } 1270 break; 1271 1272 case MFIE_TYPE_RSN: 1273 IEEE80211_DEBUG_MGMT("MFIE_TYPE_RSN: %d bytes\n", 1274 info_element->len); 1275 network->rsn_ie_len = min(info_element->len + 2, 1276 MAX_WPA_IE_LEN); 1277 memcpy(network->rsn_ie, info_element, 1278 network->rsn_ie_len); 1279 break; 1280 1281 case MFIE_TYPE_QOS_PARAMETER: 1282 printk(KERN_ERR 1283 "QoS Error need to parse QOS_PARAMETER IE\n"); 1284 break; 1285 /* 802.11h */ 1286 case MFIE_TYPE_POWER_CONSTRAINT: 1287 network->power_constraint = info_element->data[0]; 1288 network->flags |= NETWORK_HAS_POWER_CONSTRAINT; 1289 break; 1290 1291 case MFIE_TYPE_CSA: 1292 network->power_constraint = info_element->data[0]; 1293 network->flags |= NETWORK_HAS_CSA; 1294 break; 1295 1296 case MFIE_TYPE_QUIET: 1297 network->quiet.count = info_element->data[0]; 1298 network->quiet.period = info_element->data[1]; 1299 network->quiet.duration = info_element->data[2]; 1300 network->quiet.offset = info_element->data[3]; 1301 network->flags |= NETWORK_HAS_QUIET; 1302 break; 1303 1304 case MFIE_TYPE_IBSS_DFS: 1305 if (network->ibss_dfs) 1306 break; 1307 network->ibss_dfs = kmemdup(info_element->data, 1308 info_element->len, 1309 GFP_ATOMIC); 1310 if (!network->ibss_dfs) 1311 return 1; 1312 network->flags |= NETWORK_HAS_IBSS_DFS; 1313 break; 1314 1315 case MFIE_TYPE_TPC_REPORT: 1316 network->tpc_report.transmit_power = 1317 info_element->data[0]; 1318 network->tpc_report.link_margin = info_element->data[1]; 1319 network->flags |= NETWORK_HAS_TPC_REPORT; 1320 break; 1321 1322 default: 1323 IEEE80211_DEBUG_MGMT 1324 ("Unsupported info element: %s (%d)\n", 1325 get_info_element_string(info_element->id), 1326 info_element->id); 1327 break; 1328 } 1329 1330 length -= sizeof(*info_element) + info_element->len; 1331 info_element = 1332 (struct ieee80211_info_element *)&info_element-> 1333 data[info_element->len]; 1334 } 1335 1336 return 0; 1337} 1338 1339static int ieee80211_handle_assoc_resp(struct ieee80211_device *ieee, struct ieee80211_assoc_response 1340 *frame, struct ieee80211_rx_stats *stats) 1341{ 1342 struct ieee80211_network network_resp = { 1343 .ibss_dfs = NULL, 1344 }; 1345 struct ieee80211_network *network = &network_resp; 1346 struct net_device *dev = ieee->dev; 1347 1348 network->flags = 0; 1349 network->qos_data.active = 0; 1350 network->qos_data.supported = 0; 1351 network->qos_data.param_count = 0; 1352 network->qos_data.old_param_count = 0; 1353 1354 //network->atim_window = le16_to_cpu(frame->aid) & (0x3FFF); 1355 network->atim_window = le16_to_cpu(frame->aid); 1356 network->listen_interval = le16_to_cpu(frame->status); 1357 memcpy(network->bssid, frame->header.addr3, ETH_ALEN); 1358 network->capability = le16_to_cpu(frame->capability); 1359 network->last_scanned = jiffies; 1360 network->rates_len = network->rates_ex_len = 0; 1361 network->last_associate = 0; 1362 network->ssid_len = 0; 1363 network->erp_value = 1364 (network->capability & WLAN_CAPABILITY_IBSS) ? 0x3 : 0x0; 1365 1366 if (stats->freq == IEEE80211_52GHZ_BAND) { 1367 /* for A band (No DS info) */ 1368 network->channel = stats->received_channel; 1369 } else 1370 network->flags |= NETWORK_HAS_CCK; 1371 1372 network->wpa_ie_len = 0; 1373 network->rsn_ie_len = 0; 1374 1375 if (ieee80211_parse_info_param 1376 (frame->info_element, stats->len - sizeof(*frame), network)) 1377 return 1; 1378 1379 network->mode = 0; 1380 if (stats->freq == IEEE80211_52GHZ_BAND) 1381 network->mode = IEEE_A; 1382 else { 1383 if (network->flags & NETWORK_HAS_OFDM) 1384 network->mode |= IEEE_G; 1385 if (network->flags & NETWORK_HAS_CCK) 1386 network->mode |= IEEE_B; 1387 } 1388 1389 if (ieee80211_is_empty_essid(network->ssid, network->ssid_len)) 1390 network->flags |= NETWORK_EMPTY_ESSID; 1391 1392 memcpy(&network->stats, stats, sizeof(network->stats)); 1393 1394 if (ieee->handle_assoc_response != NULL) 1395 ieee->handle_assoc_response(dev, frame, network); 1396 1397 return 0; 1398} 1399 1400/***************************************************/ 1401 1402static int ieee80211_network_init(struct ieee80211_device *ieee, struct ieee80211_probe_response 1403 *beacon, 1404 struct ieee80211_network *network, 1405 struct ieee80211_rx_stats *stats) 1406{ 1407 network->qos_data.active = 0; 1408 network->qos_data.supported = 0; 1409 network->qos_data.param_count = 0; 1410 network->qos_data.old_param_count = 0; 1411 1412 /* Pull out fixed field data */ 1413 memcpy(network->bssid, beacon->header.addr3, ETH_ALEN); 1414 network->capability = le16_to_cpu(beacon->capability); 1415 network->last_scanned = jiffies; 1416 network->time_stamp[0] = le32_to_cpu(beacon->time_stamp[0]); 1417 network->time_stamp[1] = le32_to_cpu(beacon->time_stamp[1]); 1418 network->beacon_interval = le16_to_cpu(beacon->beacon_interval); 1419 /* Where to pull this? beacon->listen_interval; */ 1420 network->listen_interval = 0x0A; 1421 network->rates_len = network->rates_ex_len = 0; 1422 network->last_associate = 0; 1423 network->ssid_len = 0; 1424 network->flags = 0; 1425 network->atim_window = 0; 1426 network->erp_value = (network->capability & WLAN_CAPABILITY_IBSS) ? 1427 0x3 : 0x0; 1428 1429 if (stats->freq == IEEE80211_52GHZ_BAND) { 1430 /* for A band (No DS info) */ 1431 network->channel = stats->received_channel; 1432 } else 1433 network->flags |= NETWORK_HAS_CCK; 1434 1435 network->wpa_ie_len = 0; 1436 network->rsn_ie_len = 0; 1437 1438 if (ieee80211_parse_info_param 1439 (beacon->info_element, stats->len - sizeof(*beacon), network)) 1440 return 1; 1441 1442 network->mode = 0; 1443 if (stats->freq == IEEE80211_52GHZ_BAND) 1444 network->mode = IEEE_A; 1445 else { 1446 if (network->flags & NETWORK_HAS_OFDM) 1447 network->mode |= IEEE_G; 1448 if (network->flags & NETWORK_HAS_CCK) 1449 network->mode |= IEEE_B; 1450 } 1451 1452 if (network->mode == 0) { 1453 IEEE80211_DEBUG_SCAN("Filtered out '%s (" MAC_FMT ")' " 1454 "network.\n", 1455 escape_essid(network->ssid, 1456 network->ssid_len), 1457 MAC_ARG(network->bssid)); 1458 return 1; 1459 } 1460 1461 if (ieee80211_is_empty_essid(network->ssid, network->ssid_len)) 1462 network->flags |= NETWORK_EMPTY_ESSID; 1463 1464 memcpy(&network->stats, stats, sizeof(network->stats)); 1465 1466 return 0; 1467} 1468 1469static inline int is_same_network(struct ieee80211_network *src, 1470 struct ieee80211_network *dst) 1471{ 1472 /* A network is only a duplicate if the channel, BSSID, and ESSID 1473 * all match. We treat all <hidden> with the same BSSID and channel 1474 * as one network */ 1475 return ((src->ssid_len == dst->ssid_len) && 1476 (src->channel == dst->channel) && 1477 !compare_ether_addr(src->bssid, dst->bssid) && 1478 !memcmp(src->ssid, dst->ssid, src->ssid_len)); 1479} 1480 1481static void update_network(struct ieee80211_network *dst, 1482 struct ieee80211_network *src) 1483{ 1484 int qos_active; 1485 u8 old_param; 1486 1487 ieee80211_network_reset(dst); 1488 dst->ibss_dfs = src->ibss_dfs; 1489 1490 /* We only update the statistics if they were created by receiving 1491 * the network information on the actual channel the network is on. 1492 * 1493 * This keeps beacons received on neighbor channels from bringing 1494 * down the signal level of an AP. */ 1495 if (dst->channel == src->stats.received_channel) 1496 memcpy(&dst->stats, &src->stats, 1497 sizeof(struct ieee80211_rx_stats)); 1498 else 1499 IEEE80211_DEBUG_SCAN("Network " MAC_FMT " info received " 1500 "off channel (%d vs. %d)\n", MAC_ARG(src->bssid), 1501 dst->channel, src->stats.received_channel); 1502 1503 dst->capability = src->capability; 1504 memcpy(dst->rates, src->rates, src->rates_len); 1505 dst->rates_len = src->rates_len; 1506 memcpy(dst->rates_ex, src->rates_ex, src->rates_ex_len); 1507 dst->rates_ex_len = src->rates_ex_len; 1508 1509 dst->mode = src->mode; 1510 dst->flags = src->flags; 1511 dst->time_stamp[0] = src->time_stamp[0]; 1512 dst->time_stamp[1] = src->time_stamp[1]; 1513 1514 dst->beacon_interval = src->beacon_interval; 1515 dst->listen_interval = src->listen_interval; 1516 dst->atim_window = src->atim_window; 1517 dst->erp_value = src->erp_value; 1518 dst->tim = src->tim; 1519 1520 memcpy(dst->wpa_ie, src->wpa_ie, src->wpa_ie_len); 1521 dst->wpa_ie_len = src->wpa_ie_len; 1522 memcpy(dst->rsn_ie, src->rsn_ie, src->rsn_ie_len); 1523 dst->rsn_ie_len = src->rsn_ie_len; 1524 1525 dst->last_scanned = jiffies; 1526 qos_active = src->qos_data.active; 1527 old_param = dst->qos_data.old_param_count; 1528 if (dst->flags & NETWORK_HAS_QOS_MASK) 1529 memcpy(&dst->qos_data, &src->qos_data, 1530 sizeof(struct ieee80211_qos_data)); 1531 else { 1532 dst->qos_data.supported = src->qos_data.supported; 1533 dst->qos_data.param_count = src->qos_data.param_count; 1534 } 1535 1536 if (dst->qos_data.supported == 1) { 1537 if (dst->ssid_len) 1538 IEEE80211_DEBUG_QOS 1539 ("QoS the network %s is QoS supported\n", 1540 dst->ssid); 1541 else 1542 IEEE80211_DEBUG_QOS 1543 ("QoS the network is QoS supported\n"); 1544 } 1545 dst->qos_data.active = qos_active; 1546 dst->qos_data.old_param_count = old_param; 1547 1548 /* dst->last_associate is not overwritten */ 1549} 1550 1551static inline int is_beacon(__le16 fc) 1552{ 1553 return (WLAN_FC_GET_STYPE(le16_to_cpu(fc)) == IEEE80211_STYPE_BEACON); 1554} 1555 1556static void ieee80211_process_probe_response(struct ieee80211_device 1557 *ieee, struct 1558 ieee80211_probe_response 1559 *beacon, struct ieee80211_rx_stats 1560 *stats) 1561{ 1562 struct net_device *dev = ieee->dev; 1563 struct ieee80211_network network = { 1564 .ibss_dfs = NULL, 1565 }; 1566 struct ieee80211_network *target; 1567 struct ieee80211_network *oldest = NULL; 1568#ifdef CONFIG_IEEE80211_DEBUG 1569 struct ieee80211_info_element *info_element = beacon->info_element; 1570#endif 1571 unsigned long flags; 1572 1573 IEEE80211_DEBUG_SCAN("'%s' (" MAC_FMT 1574 "): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n", 1575 escape_essid(info_element->data, 1576 info_element->len), 1577 MAC_ARG(beacon->header.addr3), 1578 (beacon->capability & (1 << 0xf)) ? '1' : '0', 1579 (beacon->capability & (1 << 0xe)) ? '1' : '0', 1580 (beacon->capability & (1 << 0xd)) ? '1' : '0', 1581 (beacon->capability & (1 << 0xc)) ? '1' : '0', 1582 (beacon->capability & (1 << 0xb)) ? '1' : '0', 1583 (beacon->capability & (1 << 0xa)) ? '1' : '0', 1584 (beacon->capability & (1 << 0x9)) ? '1' : '0', 1585 (beacon->capability & (1 << 0x8)) ? '1' : '0', 1586 (beacon->capability & (1 << 0x7)) ? '1' : '0', 1587 (beacon->capability & (1 << 0x6)) ? '1' : '0', 1588 (beacon->capability & (1 << 0x5)) ? '1' : '0', 1589 (beacon->capability & (1 << 0x4)) ? '1' : '0', 1590 (beacon->capability & (1 << 0x3)) ? '1' : '0', 1591 (beacon->capability & (1 << 0x2)) ? '1' : '0', 1592 (beacon->capability & (1 << 0x1)) ? '1' : '0', 1593 (beacon->capability & (1 << 0x0)) ? '1' : '0'); 1594 1595 if (ieee80211_network_init(ieee, beacon, &network, stats)) { 1596 IEEE80211_DEBUG_SCAN("Dropped '%s' (" MAC_FMT ") via %s.\n", 1597 escape_essid(info_element->data, 1598 info_element->len), 1599 MAC_ARG(beacon->header.addr3), 1600 is_beacon(beacon->header.frame_ctl) ? 1601 "BEACON" : "PROBE RESPONSE"); 1602 return; 1603 } 1604 1605 /* The network parsed correctly -- so now we scan our known networks 1606 * to see if we can find it in our list. 1607 * 1608 * NOTE: This search is definitely not optimized. Once its doing 1609 * the "right thing" we'll optimize it for efficiency if 1610 * necessary */ 1611 1612 /* Search for this entry in the list and update it if it is 1613 * already there. */ 1614 1615 spin_lock_irqsave(&ieee->lock, flags); 1616 1617 list_for_each_entry(target, &ieee->network_list, list) { 1618 if (is_same_network(target, &network)) 1619 break; 1620 1621 if ((oldest == NULL) || 1622 (target->last_scanned < oldest->last_scanned)) 1623 oldest = target; 1624 } 1625 1626 /* If we didn't find a match, then get a new network slot to initialize 1627 * with this beacon's information */ 1628 if (&target->list == &ieee->network_list) { 1629 if (list_empty(&ieee->network_free_list)) { 1630 /* If there are no more slots, expire the oldest */ 1631 list_del(&oldest->list); 1632 target = oldest; 1633 IEEE80211_DEBUG_SCAN("Expired '%s' (" MAC_FMT ") from " 1634 "network list.\n", 1635 escape_essid(target->ssid, 1636 target->ssid_len), 1637 MAC_ARG(target->bssid)); 1638 ieee80211_network_reset(target); 1639 } else { 1640 /* Otherwise just pull from the free list */ 1641 target = list_entry(ieee->network_free_list.next, 1642 struct ieee80211_network, list); 1643 list_del(ieee->network_free_list.next); 1644 } 1645 1646#ifdef CONFIG_IEEE80211_DEBUG 1647 IEEE80211_DEBUG_SCAN("Adding '%s' (" MAC_FMT ") via %s.\n", 1648 escape_essid(network.ssid, 1649 network.ssid_len), 1650 MAC_ARG(network.bssid), 1651 is_beacon(beacon->header.frame_ctl) ? 1652 "BEACON" : "PROBE RESPONSE"); 1653#endif 1654 memcpy(target, &network, sizeof(*target)); 1655 network.ibss_dfs = NULL; 1656 list_add_tail(&target->list, &ieee->network_list); 1657 } else { 1658 IEEE80211_DEBUG_SCAN("Updating '%s' (" MAC_FMT ") via %s.\n", 1659 escape_essid(target->ssid, 1660 target->ssid_len), 1661 MAC_ARG(target->bssid), 1662 is_beacon(beacon->header.frame_ctl) ? 1663 "BEACON" : "PROBE RESPONSE"); 1664 update_network(target, &network); 1665 network.ibss_dfs = NULL; 1666 } 1667 1668 spin_unlock_irqrestore(&ieee->lock, flags); 1669 1670 if (is_beacon(beacon->header.frame_ctl)) { 1671 if (ieee->handle_beacon != NULL) 1672 ieee->handle_beacon(dev, beacon, target); 1673 } else { 1674 if (ieee->handle_probe_response != NULL) 1675 ieee->handle_probe_response(dev, beacon, target); 1676 } 1677} 1678 1679void ieee80211_rx_mgt(struct ieee80211_device *ieee, 1680 struct ieee80211_hdr_4addr *header, 1681 struct ieee80211_rx_stats *stats) 1682{ 1683 switch (WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl))) { 1684 case IEEE80211_STYPE_ASSOC_RESP: 1685 IEEE80211_DEBUG_MGMT("received ASSOCIATION RESPONSE (%d)\n", 1686 WLAN_FC_GET_STYPE(le16_to_cpu 1687 (header->frame_ctl))); 1688 ieee80211_handle_assoc_resp(ieee, 1689 (struct ieee80211_assoc_response *) 1690 header, stats); 1691 break; 1692 1693 case IEEE80211_STYPE_REASSOC_RESP: 1694 IEEE80211_DEBUG_MGMT("received REASSOCIATION RESPONSE (%d)\n", 1695 WLAN_FC_GET_STYPE(le16_to_cpu 1696 (header->frame_ctl))); 1697 break; 1698 1699 case IEEE80211_STYPE_PROBE_REQ: 1700 IEEE80211_DEBUG_MGMT("received auth (%d)\n", 1701 WLAN_FC_GET_STYPE(le16_to_cpu 1702 (header->frame_ctl))); 1703 1704 if (ieee->handle_probe_request != NULL) 1705 ieee->handle_probe_request(ieee->dev, 1706 (struct 1707 ieee80211_probe_request *) 1708 header, stats); 1709 break; 1710 1711 case IEEE80211_STYPE_PROBE_RESP: 1712 IEEE80211_DEBUG_MGMT("received PROBE RESPONSE (%d)\n", 1713 WLAN_FC_GET_STYPE(le16_to_cpu 1714 (header->frame_ctl))); 1715 IEEE80211_DEBUG_SCAN("Probe response\n"); 1716 ieee80211_process_probe_response(ieee, 1717 (struct 1718 ieee80211_probe_response *) 1719 header, stats); 1720 break; 1721 1722 case IEEE80211_STYPE_BEACON: 1723 IEEE80211_DEBUG_MGMT("received BEACON (%d)\n", 1724 WLAN_FC_GET_STYPE(le16_to_cpu 1725 (header->frame_ctl))); 1726 IEEE80211_DEBUG_SCAN("Beacon\n"); 1727 ieee80211_process_probe_response(ieee, 1728 (struct 1729 ieee80211_probe_response *) 1730 header, stats); 1731 break; 1732 case IEEE80211_STYPE_AUTH: 1733 1734 IEEE80211_DEBUG_MGMT("received auth (%d)\n", 1735 WLAN_FC_GET_STYPE(le16_to_cpu 1736 (header->frame_ctl))); 1737 1738 if (ieee->handle_auth != NULL) 1739 ieee->handle_auth(ieee->dev, 1740 (struct ieee80211_auth *)header); 1741 break; 1742 1743 case IEEE80211_STYPE_DISASSOC: 1744 if (ieee->handle_disassoc != NULL) 1745 ieee->handle_disassoc(ieee->dev, 1746 (struct ieee80211_disassoc *) 1747 header); 1748 break; 1749 1750 case IEEE80211_STYPE_ACTION: 1751 IEEE80211_DEBUG_MGMT("ACTION\n"); 1752 if (ieee->handle_action) 1753 ieee->handle_action(ieee->dev, 1754 (struct ieee80211_action *) 1755 header, stats); 1756 break; 1757 1758 case IEEE80211_STYPE_REASSOC_REQ: 1759 IEEE80211_DEBUG_MGMT("received reassoc (%d)\n", 1760 WLAN_FC_GET_STYPE(le16_to_cpu 1761 (header->frame_ctl))); 1762 1763 IEEE80211_DEBUG_MGMT("%s: IEEE80211_REASSOC_REQ received\n", 1764 ieee->dev->name); 1765 if (ieee->handle_reassoc_request != NULL) 1766 ieee->handle_reassoc_request(ieee->dev, 1767 (struct ieee80211_reassoc_request *) 1768 header); 1769 break; 1770 1771 case IEEE80211_STYPE_ASSOC_REQ: 1772 IEEE80211_DEBUG_MGMT("received assoc (%d)\n", 1773 WLAN_FC_GET_STYPE(le16_to_cpu 1774 (header->frame_ctl))); 1775 1776 IEEE80211_DEBUG_MGMT("%s: IEEE80211_ASSOC_REQ received\n", 1777 ieee->dev->name); 1778 if (ieee->handle_assoc_request != NULL) 1779 ieee->handle_assoc_request(ieee->dev); 1780 break; 1781 1782 case IEEE80211_STYPE_DEAUTH: 1783 IEEE80211_DEBUG_MGMT("DEAUTH\n"); 1784 if (ieee->handle_deauth != NULL) 1785 ieee->handle_deauth(ieee->dev, 1786 (struct ieee80211_deauth *) 1787 header); 1788 break; 1789 default: 1790 IEEE80211_DEBUG_MGMT("received UNKNOWN (%d)\n", 1791 WLAN_FC_GET_STYPE(le16_to_cpu 1792 (header->frame_ctl))); 1793 IEEE80211_DEBUG_MGMT("%s: Unknown management packet: %d\n", 1794 ieee->dev->name, 1795 WLAN_FC_GET_STYPE(le16_to_cpu 1796 (header->frame_ctl))); 1797 break; 1798 } 1799} 1800 1801EXPORT_SYMBOL_GPL(ieee80211_rx_any); 1802EXPORT_SYMBOL(ieee80211_rx_mgt); 1803EXPORT_SYMBOL(ieee80211_rx); 1804