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/gfp.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/proc_fs.h> 27#include <linux/skbuff.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/lib80211.h> 36 37#include "libipw.h" 38 39static void libipw_monitor_rx(struct libipw_device *ieee, 40 struct sk_buff *skb, 41 struct libipw_rx_stats *rx_stats) 42{ 43 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 44 u16 fc = le16_to_cpu(hdr->frame_control); 45 46 skb->dev = ieee->dev; 47 skb_reset_mac_header(skb); 48 skb_pull(skb, libipw_get_hdrlen(fc)); 49 skb->pkt_type = PACKET_OTHERHOST; 50 skb->protocol = htons(ETH_P_80211_RAW); 51 memset(skb->cb, 0, sizeof(skb->cb)); 52 netif_rx(skb); 53} 54 55/* Called only as a tasklet (software IRQ) */ 56static struct libipw_frag_entry *libipw_frag_cache_find(struct 57 libipw_device 58 *ieee, 59 unsigned int seq, 60 unsigned int frag, 61 u8 * src, 62 u8 * dst) 63{ 64 struct libipw_frag_entry *entry; 65 int i; 66 67 for (i = 0; i < LIBIPW_FRAG_CACHE_LEN; i++) { 68 entry = &ieee->frag_cache[i]; 69 if (entry->skb != NULL && 70 time_after(jiffies, entry->first_frag_time + 2 * HZ)) { 71 LIBIPW_DEBUG_FRAG("expiring fragment cache entry " 72 "seq=%u last_frag=%u\n", 73 entry->seq, entry->last_frag); 74 dev_kfree_skb_any(entry->skb); 75 entry->skb = NULL; 76 } 77 78 if (entry->skb != NULL && entry->seq == seq && 79 (entry->last_frag + 1 == frag || frag == -1) && 80 !compare_ether_addr(entry->src_addr, src) && 81 !compare_ether_addr(entry->dst_addr, dst)) 82 return entry; 83 } 84 85 return NULL; 86} 87 88/* Called only as a tasklet (software IRQ) */ 89static struct sk_buff *libipw_frag_cache_get(struct libipw_device *ieee, 90 struct libipw_hdr_4addr *hdr) 91{ 92 struct sk_buff *skb = NULL; 93 u16 sc; 94 unsigned int frag, seq; 95 struct libipw_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 libipw_hdr_4addr) + 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 >= LIBIPW_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 = libipw_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/* Called only as a tasklet (software IRQ) */ 140static int libipw_frag_cache_invalidate(struct libipw_device *ieee, 141 struct libipw_hdr_4addr *hdr) 142{ 143 u16 sc; 144 unsigned int seq; 145 struct libipw_frag_entry *entry; 146 147 sc = le16_to_cpu(hdr->seq_ctl); 148 seq = WLAN_GET_SEQ_SEQ(sc); 149 150 entry = libipw_frag_cache_find(ieee, seq, -1, hdr->addr2, 151 hdr->addr1); 152 153 if (entry == NULL) { 154 LIBIPW_DEBUG_FRAG("could not invalidate fragment cache " 155 "entry (seq=%u)\n", seq); 156 return -1; 157 } 158 159 entry->skb = NULL; 160 return 0; 161} 162 163#ifdef NOT_YET 164/* libipw_rx_frame_mgtmt 165 * 166 * Responsible for handling management control frames 167 * 168 * Called by libipw_rx */ 169static int 170libipw_rx_frame_mgmt(struct libipw_device *ieee, struct sk_buff *skb, 171 struct libipw_rx_stats *rx_stats, u16 type, 172 u16 stype) 173{ 174 if (ieee->iw_mode == IW_MODE_MASTER) { 175 printk(KERN_DEBUG "%s: Master mode not yet suppported.\n", 176 ieee->dev->name); 177 return 0; 178/* 179 hostap_update_sta_ps(ieee, (struct hostap_libipw_hdr_4addr *) 180 skb->data);*/ 181 } 182 183 if (ieee->hostapd && type == WLAN_FC_TYPE_MGMT) { 184 if (stype == WLAN_FC_STYPE_BEACON && 185 ieee->iw_mode == IW_MODE_MASTER) { 186 struct sk_buff *skb2; 187 /* Process beacon frames also in kernel driver to 188 * update STA(AP) table statistics */ 189 skb2 = skb_clone(skb, GFP_ATOMIC); 190 if (skb2) 191 hostap_rx(skb2->dev, skb2, rx_stats); 192 } 193 194 /* send management frames to the user space daemon for 195 * processing */ 196 ieee->apdevstats.rx_packets++; 197 ieee->apdevstats.rx_bytes += skb->len; 198 prism2_rx_80211(ieee->apdev, skb, rx_stats, PRISM2_RX_MGMT); 199 return 0; 200 } 201 202 if (ieee->iw_mode == IW_MODE_MASTER) { 203 if (type != WLAN_FC_TYPE_MGMT && type != WLAN_FC_TYPE_CTRL) { 204 printk(KERN_DEBUG "%s: unknown management frame " 205 "(type=0x%02x, stype=0x%02x) dropped\n", 206 skb->dev->name, type, stype); 207 return -1; 208 } 209 210 hostap_rx(skb->dev, skb, rx_stats); 211 return 0; 212 } 213 214 printk(KERN_DEBUG "%s: hostap_rx_frame_mgmt: management frame " 215 "received in non-Host AP mode\n", skb->dev->name); 216 return -1; 217} 218#endif 219 220/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */ 221/* Ethernet-II snap header (RFC1042 for most EtherTypes) */ 222static unsigned char libipw_rfc1042_header[] = 223 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 }; 224 225/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */ 226static unsigned char libipw_bridge_tunnel_header[] = 227 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 }; 228/* No encapsulation header if EtherType < 0x600 (=length) */ 229 230/* Called by libipw_rx_frame_decrypt */ 231static int libipw_is_eapol_frame(struct libipw_device *ieee, 232 struct sk_buff *skb) 233{ 234 struct net_device *dev = ieee->dev; 235 u16 fc, ethertype; 236 struct libipw_hdr_3addr *hdr; 237 u8 *pos; 238 239 if (skb->len < 24) 240 return 0; 241 242 hdr = (struct libipw_hdr_3addr *)skb->data; 243 fc = le16_to_cpu(hdr->frame_ctl); 244 245 /* check that the frame is unicast frame to us */ 246 if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == 247 IEEE80211_FCTL_TODS && 248 !compare_ether_addr(hdr->addr1, dev->dev_addr) && 249 !compare_ether_addr(hdr->addr3, dev->dev_addr)) { 250 /* ToDS frame with own addr BSSID and DA */ 251 } else if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == 252 IEEE80211_FCTL_FROMDS && 253 !compare_ether_addr(hdr->addr1, dev->dev_addr)) { 254 /* FromDS frame with own addr as DA */ 255 } else 256 return 0; 257 258 if (skb->len < 24 + 8) 259 return 0; 260 261 /* check for port access entity Ethernet type */ 262 pos = skb->data + 24; 263 ethertype = (pos[6] << 8) | pos[7]; 264 if (ethertype == ETH_P_PAE) 265 return 1; 266 267 return 0; 268} 269 270/* Called only as a tasklet (software IRQ), by libipw_rx */ 271static int 272libipw_rx_frame_decrypt(struct libipw_device *ieee, struct sk_buff *skb, 273 struct lib80211_crypt_data *crypt) 274{ 275 struct libipw_hdr_3addr *hdr; 276 int res, hdrlen; 277 278 if (crypt == NULL || crypt->ops->decrypt_mpdu == NULL) 279 return 0; 280 281 hdr = (struct libipw_hdr_3addr *)skb->data; 282 hdrlen = libipw_get_hdrlen(le16_to_cpu(hdr->frame_ctl)); 283 284 atomic_inc(&crypt->refcnt); 285 res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv); 286 atomic_dec(&crypt->refcnt); 287 if (res < 0) { 288 LIBIPW_DEBUG_DROP("decryption failed (SA=%pM) res=%d\n", 289 hdr->addr2, res); 290 if (res == -2) 291 LIBIPW_DEBUG_DROP("Decryption failed ICV " 292 "mismatch (key %d)\n", 293 skb->data[hdrlen + 3] >> 6); 294 ieee->ieee_stats.rx_discards_undecryptable++; 295 return -1; 296 } 297 298 return res; 299} 300 301/* Called only as a tasklet (software IRQ), by libipw_rx */ 302static int 303libipw_rx_frame_decrypt_msdu(struct libipw_device *ieee, 304 struct sk_buff *skb, int keyidx, 305 struct lib80211_crypt_data *crypt) 306{ 307 struct libipw_hdr_3addr *hdr; 308 int res, hdrlen; 309 310 if (crypt == NULL || crypt->ops->decrypt_msdu == NULL) 311 return 0; 312 313 hdr = (struct libipw_hdr_3addr *)skb->data; 314 hdrlen = libipw_get_hdrlen(le16_to_cpu(hdr->frame_ctl)); 315 316 atomic_inc(&crypt->refcnt); 317 res = crypt->ops->decrypt_msdu(skb, keyidx, hdrlen, crypt->priv); 318 atomic_dec(&crypt->refcnt); 319 if (res < 0) { 320 printk(KERN_DEBUG "%s: MSDU decryption/MIC verification failed" 321 " (SA=%pM keyidx=%d)\n", ieee->dev->name, hdr->addr2, 322 keyidx); 323 return -1; 324 } 325 326 return 0; 327} 328 329/* All received frames are sent to this function. @skb contains the frame in 330 * IEEE 802.11 format, i.e., in the format it was sent over air. 331 * This function is called only as a tasklet (software IRQ). */ 332int libipw_rx(struct libipw_device *ieee, struct sk_buff *skb, 333 struct libipw_rx_stats *rx_stats) 334{ 335 struct net_device *dev = ieee->dev; 336 struct libipw_hdr_4addr *hdr; 337 size_t hdrlen; 338 u16 fc, type, stype, sc; 339 unsigned int frag; 340 u8 *payload; 341 u16 ethertype; 342#ifdef NOT_YET 343 struct net_device *wds = NULL; 344 struct sk_buff *skb2 = NULL; 345 struct net_device *wds = NULL; 346 int frame_authorized = 0; 347 int from_assoc_ap = 0; 348 void *sta = NULL; 349#endif 350 u8 dst[ETH_ALEN]; 351 u8 src[ETH_ALEN]; 352 struct lib80211_crypt_data *crypt = NULL; 353 int keyidx = 0; 354 int can_be_decrypted = 0; 355 356 hdr = (struct libipw_hdr_4addr *)skb->data; 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 = libipw_get_hdrlen(fc); 368 369 if (skb->len < hdrlen) { 370 printk(KERN_INFO "%s: invalid SKB length %d\n", 371 dev->name, skb->len); 372 goto rx_dropped; 373 } 374 375 /* Put this code here so that we avoid duplicating it in all 376 * Rx paths. - Jean II */ 377#ifdef CONFIG_WIRELESS_EXT 378#ifdef IW_WIRELESS_SPY /* defined in iw_handler.h */ 379 /* If spy monitoring on */ 380 if (ieee->spy_data.spy_number > 0) { 381 struct iw_quality wstats; 382 383 wstats.updated = 0; 384 if (rx_stats->mask & LIBIPW_STATMASK_RSSI) { 385 wstats.level = rx_stats->signal; 386 wstats.updated |= IW_QUAL_LEVEL_UPDATED; 387 } else 388 wstats.updated |= IW_QUAL_LEVEL_INVALID; 389 390 if (rx_stats->mask & LIBIPW_STATMASK_NOISE) { 391 wstats.noise = rx_stats->noise; 392 wstats.updated |= IW_QUAL_NOISE_UPDATED; 393 } else 394 wstats.updated |= IW_QUAL_NOISE_INVALID; 395 396 if (rx_stats->mask & LIBIPW_STATMASK_SIGNAL) { 397 wstats.qual = rx_stats->signal; 398 wstats.updated |= IW_QUAL_QUAL_UPDATED; 399 } else 400 wstats.updated |= IW_QUAL_QUAL_INVALID; 401 402 /* Update spy records */ 403 wireless_spy_update(ieee->dev, hdr->addr2, &wstats); 404 } 405#endif /* IW_WIRELESS_SPY */ 406#endif /* CONFIG_WIRELESS_EXT */ 407 408#ifdef NOT_YET 409 hostap_update_rx_stats(local->ap, hdr, rx_stats); 410#endif 411 412 if (ieee->iw_mode == IW_MODE_MONITOR) { 413 dev->stats.rx_packets++; 414 dev->stats.rx_bytes += skb->len; 415 libipw_monitor_rx(ieee, skb, rx_stats); 416 return 1; 417 } 418 419 can_be_decrypted = (is_multicast_ether_addr(hdr->addr1) || 420 is_broadcast_ether_addr(hdr->addr2)) ? 421 ieee->host_mc_decrypt : ieee->host_decrypt; 422 423 if (can_be_decrypted) { 424 if (skb->len >= hdrlen + 3) { 425 /* Top two-bits of byte 3 are the key index */ 426 keyidx = skb->data[hdrlen + 3] >> 6; 427 } 428 429 /* ieee->crypt[] is WEP_KEY (4) in length. Given that keyidx 430 * is only allowed 2-bits of storage, no value of keyidx can 431 * be provided via above code that would result in keyidx 432 * being out of range */ 433 crypt = ieee->crypt_info.crypt[keyidx]; 434 435#ifdef NOT_YET 436 sta = NULL; 437 438 /* Use station specific key to override default keys if the 439 * receiver address is a unicast address ("individual RA"). If 440 * bcrx_sta_key parameter is set, station specific key is used 441 * even with broad/multicast targets (this is against IEEE 442 * 802.11, but makes it easier to use different keys with 443 * stations that do not support WEP key mapping). */ 444 445 if (!(hdr->addr1[0] & 0x01) || local->bcrx_sta_key) 446 (void)hostap_handle_sta_crypto(local, hdr, &crypt, 447 &sta); 448#endif 449 450 /* allow NULL decrypt to indicate an station specific override 451 * for default encryption */ 452 if (crypt && (crypt->ops == NULL || 453 crypt->ops->decrypt_mpdu == NULL)) 454 crypt = NULL; 455 456 if (!crypt && (fc & IEEE80211_FCTL_PROTECTED)) { 457 /* This seems to be triggered by some (multicast?) 458 * frames from other than current BSS, so just drop the 459 * frames silently instead of filling system log with 460 * these reports. */ 461 LIBIPW_DEBUG_DROP("Decryption failed (not set)" 462 " (SA=%pM)\n", hdr->addr2); 463 ieee->ieee_stats.rx_discards_undecryptable++; 464 goto rx_dropped; 465 } 466 } 467#ifdef NOT_YET 468 if (type != WLAN_FC_TYPE_DATA) { 469 if (type == WLAN_FC_TYPE_MGMT && stype == WLAN_FC_STYPE_AUTH && 470 fc & IEEE80211_FCTL_PROTECTED && ieee->host_decrypt && 471 (keyidx = hostap_rx_frame_decrypt(ieee, skb, crypt)) < 0) { 472 printk(KERN_DEBUG "%s: failed to decrypt mgmt::auth " 473 "from %pM\n", dev->name, hdr->addr2); 474 /* TODO: could inform hostapd about this so that it 475 * could send auth failure report */ 476 goto rx_dropped; 477 } 478 479 if (libipw_rx_frame_mgmt(ieee, skb, rx_stats, type, stype)) 480 goto rx_dropped; 481 else 482 goto rx_exit; 483 } 484#endif 485 /* drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.29) */ 486 if (sc == ieee->prev_seq_ctl) 487 goto rx_dropped; 488 else 489 ieee->prev_seq_ctl = sc; 490 491 /* Data frame - extract src/dst addresses */ 492 if (skb->len < LIBIPW_3ADDR_LEN) 493 goto rx_dropped; 494 495 switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) { 496 case IEEE80211_FCTL_FROMDS: 497 memcpy(dst, hdr->addr1, ETH_ALEN); 498 memcpy(src, hdr->addr3, ETH_ALEN); 499 break; 500 case IEEE80211_FCTL_TODS: 501 memcpy(dst, hdr->addr3, ETH_ALEN); 502 memcpy(src, hdr->addr2, ETH_ALEN); 503 break; 504 case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS: 505 if (skb->len < LIBIPW_4ADDR_LEN) 506 goto rx_dropped; 507 memcpy(dst, hdr->addr3, ETH_ALEN); 508 memcpy(src, hdr->addr4, ETH_ALEN); 509 break; 510 case 0: 511 memcpy(dst, hdr->addr1, ETH_ALEN); 512 memcpy(src, hdr->addr2, ETH_ALEN); 513 break; 514 } 515 516#ifdef NOT_YET 517 if (hostap_rx_frame_wds(ieee, hdr, fc, &wds)) 518 goto rx_dropped; 519 if (wds) { 520 skb->dev = dev = wds; 521 stats = hostap_get_stats(dev); 522 } 523 524 if (ieee->iw_mode == IW_MODE_MASTER && !wds && 525 (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == 526 IEEE80211_FCTL_FROMDS && ieee->stadev 527 && !compare_ether_addr(hdr->addr2, ieee->assoc_ap_addr)) { 528 /* Frame from BSSID of the AP for which we are a client */ 529 skb->dev = dev = ieee->stadev; 530 stats = hostap_get_stats(dev); 531 from_assoc_ap = 1; 532 } 533#endif 534 535#ifdef NOT_YET 536 if ((ieee->iw_mode == IW_MODE_MASTER || 537 ieee->iw_mode == IW_MODE_REPEAT) && !from_assoc_ap) { 538 switch (hostap_handle_sta_rx(ieee, dev, skb, rx_stats, 539 wds != NULL)) { 540 case AP_RX_CONTINUE_NOT_AUTHORIZED: 541 frame_authorized = 0; 542 break; 543 case AP_RX_CONTINUE: 544 frame_authorized = 1; 545 break; 546 case AP_RX_DROP: 547 goto rx_dropped; 548 case AP_RX_EXIT: 549 goto rx_exit; 550 } 551 } 552#endif 553 554 /* Nullfunc frames may have PS-bit set, so they must be passed to 555 * hostap_handle_sta_rx() before being dropped here. */ 556 557 stype &= ~IEEE80211_STYPE_QOS_DATA; 558 559 if (stype != IEEE80211_STYPE_DATA && 560 stype != IEEE80211_STYPE_DATA_CFACK && 561 stype != IEEE80211_STYPE_DATA_CFPOLL && 562 stype != IEEE80211_STYPE_DATA_CFACKPOLL) { 563 if (stype != IEEE80211_STYPE_NULLFUNC) 564 LIBIPW_DEBUG_DROP("RX: dropped data frame " 565 "with no data (type=0x%02x, " 566 "subtype=0x%02x, len=%d)\n", 567 type, stype, skb->len); 568 goto rx_dropped; 569 } 570 571 /* skb: hdr + (possibly fragmented, possibly encrypted) payload */ 572 573 if ((fc & IEEE80211_FCTL_PROTECTED) && can_be_decrypted && 574 (keyidx = libipw_rx_frame_decrypt(ieee, skb, crypt)) < 0) 575 goto rx_dropped; 576 577 hdr = (struct libipw_hdr_4addr *)skb->data; 578 579 /* skb: hdr + (possibly fragmented) plaintext payload */ 580 // ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) && 581 if ((frag != 0) || (fc & IEEE80211_FCTL_MOREFRAGS)) { 582 int flen; 583 struct sk_buff *frag_skb = libipw_frag_cache_get(ieee, hdr); 584 LIBIPW_DEBUG_FRAG("Rx Fragment received (%u)\n", frag); 585 586 if (!frag_skb) { 587 LIBIPW_DEBUG(LIBIPW_DL_RX | LIBIPW_DL_FRAG, 588 "Rx cannot get skb from fragment " 589 "cache (morefrag=%d seq=%u frag=%u)\n", 590 (fc & IEEE80211_FCTL_MOREFRAGS) != 0, 591 WLAN_GET_SEQ_SEQ(sc), frag); 592 goto rx_dropped; 593 } 594 595 flen = skb->len; 596 if (frag != 0) 597 flen -= hdrlen; 598 599 if (frag_skb->tail + flen > frag_skb->end) { 600 printk(KERN_WARNING "%s: host decrypted and " 601 "reassembled frame did not fit skb\n", 602 dev->name); 603 libipw_frag_cache_invalidate(ieee, hdr); 604 goto rx_dropped; 605 } 606 607 if (frag == 0) { 608 /* copy first fragment (including full headers) into 609 * beginning of the fragment cache skb */ 610 skb_copy_from_linear_data(skb, skb_put(frag_skb, flen), flen); 611 } else { 612 /* append frame payload to the end of the fragment 613 * cache skb */ 614 skb_copy_from_linear_data_offset(skb, hdrlen, 615 skb_put(frag_skb, flen), flen); 616 } 617 dev_kfree_skb_any(skb); 618 skb = NULL; 619 620 if (fc & IEEE80211_FCTL_MOREFRAGS) { 621 /* more fragments expected - leave the skb in fragment 622 * cache for now; it will be delivered to upper layers 623 * after all fragments have been received */ 624 goto rx_exit; 625 } 626 627 /* this was the last fragment and the frame will be 628 * delivered, so remove skb from fragment cache */ 629 skb = frag_skb; 630 hdr = (struct libipw_hdr_4addr *)skb->data; 631 libipw_frag_cache_invalidate(ieee, hdr); 632 } 633 634 /* skb: hdr + (possible reassembled) full MSDU payload; possibly still 635 * encrypted/authenticated */ 636 if ((fc & IEEE80211_FCTL_PROTECTED) && can_be_decrypted && 637 libipw_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt)) 638 goto rx_dropped; 639 640 hdr = (struct libipw_hdr_4addr *)skb->data; 641 if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep) { 642 if ( /*ieee->ieee802_1x && */ 643 libipw_is_eapol_frame(ieee, skb)) { 644 /* pass unencrypted EAPOL frames even if encryption is 645 * configured */ 646 } else { 647 LIBIPW_DEBUG_DROP("encryption configured, but RX " 648 "frame not encrypted (SA=%pM)\n", 649 hdr->addr2); 650 goto rx_dropped; 651 } 652 } 653 654 if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep && 655 !libipw_is_eapol_frame(ieee, skb)) { 656 LIBIPW_DEBUG_DROP("dropped unencrypted RX data " 657 "frame from %pM (drop_unencrypted=1)\n", 658 hdr->addr2); 659 goto rx_dropped; 660 } 661 662 /* If the frame was decrypted in hardware, we may need to strip off 663 * any security data (IV, ICV, etc) that was left behind */ 664 if (!can_be_decrypted && (fc & IEEE80211_FCTL_PROTECTED) && 665 ieee->host_strip_iv_icv) { 666 int trimlen = 0; 667 668 /* Top two-bits of byte 3 are the key index */ 669 if (skb->len >= hdrlen + 3) 670 keyidx = skb->data[hdrlen + 3] >> 6; 671 672 /* To strip off any security data which appears before the 673 * payload, we simply increase hdrlen (as the header gets 674 * chopped off immediately below). For the security data which 675 * appears after the payload, we use skb_trim. */ 676 677 switch (ieee->sec.encode_alg[keyidx]) { 678 case SEC_ALG_WEP: 679 /* 4 byte IV */ 680 hdrlen += 4; 681 /* 4 byte ICV */ 682 trimlen = 4; 683 break; 684 case SEC_ALG_TKIP: 685 /* 4 byte IV, 4 byte ExtIV */ 686 hdrlen += 8; 687 /* 8 byte MIC, 4 byte ICV */ 688 trimlen = 12; 689 break; 690 case SEC_ALG_CCMP: 691 /* 8 byte CCMP header */ 692 hdrlen += 8; 693 /* 8 byte MIC */ 694 trimlen = 8; 695 break; 696 } 697 698 if (skb->len < trimlen) 699 goto rx_dropped; 700 701 __skb_trim(skb, skb->len - trimlen); 702 703 if (skb->len < hdrlen) 704 goto rx_dropped; 705 } 706 707 /* skb: hdr + (possible reassembled) full plaintext payload */ 708 709 payload = skb->data + hdrlen; 710 ethertype = (payload[6] << 8) | payload[7]; 711 712#ifdef NOT_YET 713 /* If IEEE 802.1X is used, check whether the port is authorized to send 714 * the received frame. */ 715 if (ieee->ieee802_1x && ieee->iw_mode == IW_MODE_MASTER) { 716 if (ethertype == ETH_P_PAE) { 717 printk(KERN_DEBUG "%s: RX: IEEE 802.1X frame\n", 718 dev->name); 719 if (ieee->hostapd && ieee->apdev) { 720 /* Send IEEE 802.1X frames to the user 721 * space daemon for processing */ 722 prism2_rx_80211(ieee->apdev, skb, rx_stats, 723 PRISM2_RX_MGMT); 724 ieee->apdevstats.rx_packets++; 725 ieee->apdevstats.rx_bytes += skb->len; 726 goto rx_exit; 727 } 728 } else if (!frame_authorized) { 729 printk(KERN_DEBUG "%s: dropped frame from " 730 "unauthorized port (IEEE 802.1X): " 731 "ethertype=0x%04x\n", dev->name, ethertype); 732 goto rx_dropped; 733 } 734 } 735#endif 736 737 /* convert hdr + possible LLC headers into Ethernet header */ 738 if (skb->len - hdrlen >= 8 && 739 ((memcmp(payload, libipw_rfc1042_header, SNAP_SIZE) == 0 && 740 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || 741 memcmp(payload, libipw_bridge_tunnel_header, SNAP_SIZE) == 0)) { 742 /* remove RFC1042 or Bridge-Tunnel encapsulation and 743 * replace EtherType */ 744 skb_pull(skb, hdrlen + SNAP_SIZE); 745 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); 746 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); 747 } else { 748 __be16 len; 749 /* Leave Ethernet header part of hdr and full payload */ 750 skb_pull(skb, hdrlen); 751 len = htons(skb->len); 752 memcpy(skb_push(skb, 2), &len, 2); 753 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); 754 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); 755 } 756 757#ifdef NOT_YET 758 if (wds && ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == 759 IEEE80211_FCTL_TODS) && skb->len >= ETH_HLEN + ETH_ALEN) { 760 /* Non-standard frame: get addr4 from its bogus location after 761 * the payload */ 762 skb_copy_to_linear_data_offset(skb, ETH_ALEN, 763 skb->data + skb->len - ETH_ALEN, 764 ETH_ALEN); 765 skb_trim(skb, skb->len - ETH_ALEN); 766 } 767#endif 768 769 dev->stats.rx_packets++; 770 dev->stats.rx_bytes += skb->len; 771 772#ifdef NOT_YET 773 if (ieee->iw_mode == IW_MODE_MASTER && !wds && ieee->ap->bridge_packets) { 774 if (dst[0] & 0x01) { 775 /* copy multicast frame both to the higher layers and 776 * to the wireless media */ 777 ieee->ap->bridged_multicast++; 778 skb2 = skb_clone(skb, GFP_ATOMIC); 779 if (skb2 == NULL) 780 printk(KERN_DEBUG "%s: skb_clone failed for " 781 "multicast frame\n", dev->name); 782 } else if (hostap_is_sta_assoc(ieee->ap, dst)) { 783 /* send frame directly to the associated STA using 784 * wireless media and not passing to higher layers */ 785 ieee->ap->bridged_unicast++; 786 skb2 = skb; 787 skb = NULL; 788 } 789 } 790 791 if (skb2 != NULL) { 792 /* send to wireless media */ 793 skb2->dev = dev; 794 skb2->protocol = htons(ETH_P_802_3); 795 skb_reset_mac_header(skb2); 796 skb_reset_network_header(skb2); 797 /* skb2->network_header += ETH_HLEN; */ 798 dev_queue_xmit(skb2); 799 } 800#endif 801 802 if (skb) { 803 skb->protocol = eth_type_trans(skb, dev); 804 memset(skb->cb, 0, sizeof(skb->cb)); 805 skb->ip_summed = CHECKSUM_NONE; /* 802.11 crc not sufficient */ 806 if (netif_rx(skb) == NET_RX_DROP) { 807 /* netif_rx always succeeds, but it might drop 808 * the packet. If it drops the packet, we log that 809 * in our stats. */ 810 LIBIPW_DEBUG_DROP 811 ("RX: netif_rx dropped the packet\n"); 812 dev->stats.rx_dropped++; 813 } 814 } 815 816 rx_exit: 817#ifdef NOT_YET 818 if (sta) 819 hostap_handle_sta_release(sta); 820#endif 821 return 1; 822 823 rx_dropped: 824 dev->stats.rx_dropped++; 825 826 /* Returning 0 indicates to caller that we have not handled the SKB-- 827 * so it is still allocated and can be used again by underlying 828 * hardware as a DMA target */ 829 return 0; 830} 831 832/* Filter out unrelated packets, call libipw_rx[_mgt] 833 * This function takes over the skb, it should not be used again after calling 834 * this function. */ 835void libipw_rx_any(struct libipw_device *ieee, 836 struct sk_buff *skb, struct libipw_rx_stats *stats) 837{ 838 struct libipw_hdr_4addr *hdr; 839 int is_packet_for_us; 840 u16 fc; 841 842 if (ieee->iw_mode == IW_MODE_MONITOR) { 843 if (!libipw_rx(ieee, skb, stats)) 844 dev_kfree_skb_irq(skb); 845 return; 846 } 847 848 if (skb->len < sizeof(struct ieee80211_hdr)) 849 goto drop_free; 850 851 hdr = (struct libipw_hdr_4addr *)skb->data; 852 fc = le16_to_cpu(hdr->frame_ctl); 853 854 if ((fc & IEEE80211_FCTL_VERS) != 0) 855 goto drop_free; 856 857 switch (fc & IEEE80211_FCTL_FTYPE) { 858 case IEEE80211_FTYPE_MGMT: 859 if (skb->len < sizeof(struct libipw_hdr_3addr)) 860 goto drop_free; 861 libipw_rx_mgt(ieee, hdr, stats); 862 dev_kfree_skb_irq(skb); 863 return; 864 case IEEE80211_FTYPE_DATA: 865 break; 866 case IEEE80211_FTYPE_CTL: 867 return; 868 default: 869 return; 870 } 871 872 is_packet_for_us = 0; 873 switch (ieee->iw_mode) { 874 case IW_MODE_ADHOC: 875 /* our BSS and not from/to DS */ 876 if (memcmp(hdr->addr3, ieee->bssid, ETH_ALEN) == 0) 877 if ((fc & (IEEE80211_FCTL_TODS+IEEE80211_FCTL_FROMDS)) == 0) { 878 /* promisc: get all */ 879 if (ieee->dev->flags & IFF_PROMISC) 880 is_packet_for_us = 1; 881 /* to us */ 882 else if (memcmp(hdr->addr1, ieee->dev->dev_addr, ETH_ALEN) == 0) 883 is_packet_for_us = 1; 884 /* mcast */ 885 else if (is_multicast_ether_addr(hdr->addr1)) 886 is_packet_for_us = 1; 887 } 888 break; 889 case IW_MODE_INFRA: 890 /* our BSS (== from our AP) and from DS */ 891 if (memcmp(hdr->addr2, ieee->bssid, ETH_ALEN) == 0) 892 if ((fc & (IEEE80211_FCTL_TODS+IEEE80211_FCTL_FROMDS)) == IEEE80211_FCTL_FROMDS) { 893 /* promisc: get all */ 894 if (ieee->dev->flags & IFF_PROMISC) 895 is_packet_for_us = 1; 896 /* to us */ 897 else if (memcmp(hdr->addr1, ieee->dev->dev_addr, ETH_ALEN) == 0) 898 is_packet_for_us = 1; 899 /* mcast */ 900 else if (is_multicast_ether_addr(hdr->addr1)) { 901 /* not our own packet bcasted from AP */ 902 if (memcmp(hdr->addr3, ieee->dev->dev_addr, ETH_ALEN)) 903 is_packet_for_us = 1; 904 } 905 } 906 break; 907 default: 908 /* ? */ 909 break; 910 } 911 912 if (is_packet_for_us) 913 if (!libipw_rx(ieee, skb, stats)) 914 dev_kfree_skb_irq(skb); 915 return; 916 917drop_free: 918 dev_kfree_skb_irq(skb); 919 ieee->dev->stats.rx_dropped++; 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 libipw_verify_qos_info(struct libipw_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 libipw_read_qos_param_element(struct libipw_qos_parameter_info 950 *element_param, struct libipw_info_element 951 *info_element) 952{ 953 int ret = 0; 954 u16 size = sizeof(struct libipw_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 = libipw_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 libipw_read_qos_info_element(struct 976 libipw_qos_information_element 977 *element_info, struct libipw_info_element 978 *info_element) 979{ 980 int ret = 0; 981 u16 size = sizeof(struct libipw_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 = libipw_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 libipw_qos_convert_ac_to_parameters(struct 1006 libipw_qos_parameter_info 1007 *param_elm, struct 1008 libipw_qos_parameters 1009 *qos_param) 1010{ 1011 int rc = 0; 1012 int i; 1013 struct libipw_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] = cpu_to_le16((1 << cw_min) - 1); 1026 1027 cw_max = (ac_params->ecw_min_max & 0xF0) >> 4; 1028 qos_param->cw_max[i] = cpu_to_le16((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] = cpu_to_le16(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 libipw_parse_qos_info_param_IE(struct libipw_info_element 1045 *info_element, 1046 struct libipw_network *network) 1047{ 1048 int rc = 0; 1049 struct libipw_qos_parameters *qos_param = NULL; 1050 struct libipw_qos_information_element qos_info_element; 1051 1052 rc = libipw_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 libipw_qos_parameter_info param_element; 1059 1060 rc = libipw_read_qos_param_element(¶m_element, 1061 info_element); 1062 if (rc == 0) { 1063 qos_param = &(network->qos_data.parameters); 1064 libipw_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 LIBIPW_DEBUG_QOS("QoS is supported\n"); 1074 network->qos_data.supported = 1; 1075 } 1076 return rc; 1077} 1078 1079#ifdef CONFIG_LIBIPW_DEBUG 1080#define MFIE_STRING(x) case WLAN_EID_ ##x: return #x 1081 1082static const char *get_info_element_string(u16 id) 1083{ 1084 switch (id) { 1085 MFIE_STRING(SSID); 1086 MFIE_STRING(SUPP_RATES); 1087 MFIE_STRING(FH_PARAMS); 1088 MFIE_STRING(DS_PARAMS); 1089 MFIE_STRING(CF_PARAMS); 1090 MFIE_STRING(TIM); 1091 MFIE_STRING(IBSS_PARAMS); 1092 MFIE_STRING(COUNTRY); 1093 MFIE_STRING(HP_PARAMS); 1094 MFIE_STRING(HP_TABLE); 1095 MFIE_STRING(REQUEST); 1096 MFIE_STRING(CHALLENGE); 1097 MFIE_STRING(PWR_CONSTRAINT); 1098 MFIE_STRING(PWR_CAPABILITY); 1099 MFIE_STRING(TPC_REQUEST); 1100 MFIE_STRING(TPC_REPORT); 1101 MFIE_STRING(SUPPORTED_CHANNELS); 1102 MFIE_STRING(CHANNEL_SWITCH); 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(EXT_SUPP_RATES); 1110 MFIE_STRING(GENERIC); 1111 MFIE_STRING(QOS_PARAMETER); 1112 default: 1113 return "UNKNOWN"; 1114 } 1115} 1116#endif 1117 1118static int libipw_parse_info_param(struct libipw_info_element 1119 *info_element, u16 length, 1120 struct libipw_network *network) 1121{ 1122 DECLARE_SSID_BUF(ssid); 1123 u8 i; 1124#ifdef CONFIG_LIBIPW_DEBUG 1125 char rates_str[64]; 1126 char *p; 1127#endif 1128 1129 while (length >= sizeof(*info_element)) { 1130 if (sizeof(*info_element) + info_element->len > length) { 1131 LIBIPW_DEBUG_MGMT("Info elem: parse failed: " 1132 "info_element->len + 2 > left : " 1133 "info_element->len+2=%zd left=%d, id=%d.\n", 1134 info_element->len + 1135 sizeof(*info_element), 1136 length, info_element->id); 1137 /* We stop processing but don't return an error here 1138 * because some misbehaviour APs break this rule. ie. 1139 * Orinoco AP1000. */ 1140 break; 1141 } 1142 1143 switch (info_element->id) { 1144 case WLAN_EID_SSID: 1145 network->ssid_len = min(info_element->len, 1146 (u8) IW_ESSID_MAX_SIZE); 1147 memcpy(network->ssid, info_element->data, 1148 network->ssid_len); 1149 if (network->ssid_len < IW_ESSID_MAX_SIZE) 1150 memset(network->ssid + network->ssid_len, 0, 1151 IW_ESSID_MAX_SIZE - network->ssid_len); 1152 1153 LIBIPW_DEBUG_MGMT("WLAN_EID_SSID: '%s' len=%d.\n", 1154 print_ssid(ssid, network->ssid, 1155 network->ssid_len), 1156 network->ssid_len); 1157 break; 1158 1159 case WLAN_EID_SUPP_RATES: 1160#ifdef CONFIG_LIBIPW_DEBUG 1161 p = rates_str; 1162#endif 1163 network->rates_len = min(info_element->len, 1164 MAX_RATES_LENGTH); 1165 for (i = 0; i < network->rates_len; i++) { 1166 network->rates[i] = info_element->data[i]; 1167#ifdef CONFIG_LIBIPW_DEBUG 1168 p += snprintf(p, sizeof(rates_str) - 1169 (p - rates_str), "%02X ", 1170 network->rates[i]); 1171#endif 1172 if (libipw_is_ofdm_rate 1173 (info_element->data[i])) { 1174 network->flags |= NETWORK_HAS_OFDM; 1175 if (info_element->data[i] & 1176 LIBIPW_BASIC_RATE_MASK) 1177 network->flags &= 1178 ~NETWORK_HAS_CCK; 1179 } 1180 } 1181 1182 LIBIPW_DEBUG_MGMT("WLAN_EID_SUPP_RATES: '%s' (%d)\n", 1183 rates_str, network->rates_len); 1184 break; 1185 1186 case WLAN_EID_EXT_SUPP_RATES: 1187#ifdef CONFIG_LIBIPW_DEBUG 1188 p = rates_str; 1189#endif 1190 network->rates_ex_len = min(info_element->len, 1191 MAX_RATES_EX_LENGTH); 1192 for (i = 0; i < network->rates_ex_len; i++) { 1193 network->rates_ex[i] = info_element->data[i]; 1194#ifdef CONFIG_LIBIPW_DEBUG 1195 p += snprintf(p, sizeof(rates_str) - 1196 (p - rates_str), "%02X ", 1197 network->rates[i]); 1198#endif 1199 if (libipw_is_ofdm_rate 1200 (info_element->data[i])) { 1201 network->flags |= NETWORK_HAS_OFDM; 1202 if (info_element->data[i] & 1203 LIBIPW_BASIC_RATE_MASK) 1204 network->flags &= 1205 ~NETWORK_HAS_CCK; 1206 } 1207 } 1208 1209 LIBIPW_DEBUG_MGMT("WLAN_EID_EXT_SUPP_RATES: '%s' (%d)\n", 1210 rates_str, network->rates_ex_len); 1211 break; 1212 1213 case WLAN_EID_DS_PARAMS: 1214 LIBIPW_DEBUG_MGMT("WLAN_EID_DS_PARAMS: %d\n", 1215 info_element->data[0]); 1216 network->channel = info_element->data[0]; 1217 break; 1218 1219 case WLAN_EID_FH_PARAMS: 1220 LIBIPW_DEBUG_MGMT("WLAN_EID_FH_PARAMS: ignored\n"); 1221 break; 1222 1223 case WLAN_EID_CF_PARAMS: 1224 LIBIPW_DEBUG_MGMT("WLAN_EID_CF_PARAMS: ignored\n"); 1225 break; 1226 1227 case WLAN_EID_TIM: 1228 network->tim.tim_count = info_element->data[0]; 1229 network->tim.tim_period = info_element->data[1]; 1230 LIBIPW_DEBUG_MGMT("WLAN_EID_TIM: partially ignored\n"); 1231 break; 1232 1233 case WLAN_EID_ERP_INFO: 1234 network->erp_value = info_element->data[0]; 1235 network->flags |= NETWORK_HAS_ERP_VALUE; 1236 LIBIPW_DEBUG_MGMT("MFIE_TYPE_ERP_SET: %d\n", 1237 network->erp_value); 1238 break; 1239 1240 case WLAN_EID_IBSS_PARAMS: 1241 network->atim_window = info_element->data[0]; 1242 LIBIPW_DEBUG_MGMT("WLAN_EID_IBSS_PARAMS: %d\n", 1243 network->atim_window); 1244 break; 1245 1246 case WLAN_EID_CHALLENGE: 1247 LIBIPW_DEBUG_MGMT("WLAN_EID_CHALLENGE: ignored\n"); 1248 break; 1249 1250 case WLAN_EID_GENERIC: 1251 LIBIPW_DEBUG_MGMT("WLAN_EID_GENERIC: %d bytes\n", 1252 info_element->len); 1253 if (!libipw_parse_qos_info_param_IE(info_element, 1254 network)) 1255 break; 1256 1257 if (info_element->len >= 4 && 1258 info_element->data[0] == 0x00 && 1259 info_element->data[1] == 0x50 && 1260 info_element->data[2] == 0xf2 && 1261 info_element->data[3] == 0x01) { 1262 network->wpa_ie_len = min(info_element->len + 2, 1263 MAX_WPA_IE_LEN); 1264 memcpy(network->wpa_ie, info_element, 1265 network->wpa_ie_len); 1266 } 1267 break; 1268 1269 case WLAN_EID_RSN: 1270 LIBIPW_DEBUG_MGMT("WLAN_EID_RSN: %d bytes\n", 1271 info_element->len); 1272 network->rsn_ie_len = min(info_element->len + 2, 1273 MAX_WPA_IE_LEN); 1274 memcpy(network->rsn_ie, info_element, 1275 network->rsn_ie_len); 1276 break; 1277 1278 case WLAN_EID_QOS_PARAMETER: 1279 printk(KERN_ERR 1280 "QoS Error need to parse QOS_PARAMETER IE\n"); 1281 break; 1282 /* 802.11h */ 1283 case WLAN_EID_PWR_CONSTRAINT: 1284 network->power_constraint = info_element->data[0]; 1285 network->flags |= NETWORK_HAS_POWER_CONSTRAINT; 1286 break; 1287 1288 case WLAN_EID_CHANNEL_SWITCH: 1289 network->power_constraint = info_element->data[0]; 1290 network->flags |= NETWORK_HAS_CSA; 1291 break; 1292 1293 case WLAN_EID_QUIET: 1294 network->quiet.count = info_element->data[0]; 1295 network->quiet.period = info_element->data[1]; 1296 network->quiet.duration = info_element->data[2]; 1297 network->quiet.offset = info_element->data[3]; 1298 network->flags |= NETWORK_HAS_QUIET; 1299 break; 1300 1301 case WLAN_EID_IBSS_DFS: 1302 if (network->ibss_dfs) 1303 break; 1304 network->ibss_dfs = kmemdup(info_element->data, 1305 info_element->len, 1306 GFP_ATOMIC); 1307 if (!network->ibss_dfs) 1308 return 1; 1309 network->flags |= NETWORK_HAS_IBSS_DFS; 1310 break; 1311 1312 case WLAN_EID_TPC_REPORT: 1313 network->tpc_report.transmit_power = 1314 info_element->data[0]; 1315 network->tpc_report.link_margin = info_element->data[1]; 1316 network->flags |= NETWORK_HAS_TPC_REPORT; 1317 break; 1318 1319 default: 1320 LIBIPW_DEBUG_MGMT 1321 ("Unsupported info element: %s (%d)\n", 1322 get_info_element_string(info_element->id), 1323 info_element->id); 1324 break; 1325 } 1326 1327 length -= sizeof(*info_element) + info_element->len; 1328 info_element = 1329 (struct libipw_info_element *)&info_element-> 1330 data[info_element->len]; 1331 } 1332 1333 return 0; 1334} 1335 1336static int libipw_handle_assoc_resp(struct libipw_device *ieee, struct libipw_assoc_response 1337 *frame, struct libipw_rx_stats *stats) 1338{ 1339 struct libipw_network network_resp = { 1340 .ibss_dfs = NULL, 1341 }; 1342 struct libipw_network *network = &network_resp; 1343 struct net_device *dev = ieee->dev; 1344 1345 network->flags = 0; 1346 network->qos_data.active = 0; 1347 network->qos_data.supported = 0; 1348 network->qos_data.param_count = 0; 1349 network->qos_data.old_param_count = 0; 1350 1351 //network->atim_window = le16_to_cpu(frame->aid) & (0x3FFF); 1352 network->atim_window = le16_to_cpu(frame->aid); 1353 network->listen_interval = le16_to_cpu(frame->status); 1354 memcpy(network->bssid, frame->header.addr3, ETH_ALEN); 1355 network->capability = le16_to_cpu(frame->capability); 1356 network->last_scanned = jiffies; 1357 network->rates_len = network->rates_ex_len = 0; 1358 network->last_associate = 0; 1359 network->ssid_len = 0; 1360 network->erp_value = 1361 (network->capability & WLAN_CAPABILITY_IBSS) ? 0x3 : 0x0; 1362 1363 if (stats->freq == LIBIPW_52GHZ_BAND) { 1364 /* for A band (No DS info) */ 1365 network->channel = stats->received_channel; 1366 } else 1367 network->flags |= NETWORK_HAS_CCK; 1368 1369 network->wpa_ie_len = 0; 1370 network->rsn_ie_len = 0; 1371 1372 if (libipw_parse_info_param 1373 (frame->info_element, stats->len - sizeof(*frame), network)) 1374 return 1; 1375 1376 network->mode = 0; 1377 if (stats->freq == LIBIPW_52GHZ_BAND) 1378 network->mode = IEEE_A; 1379 else { 1380 if (network->flags & NETWORK_HAS_OFDM) 1381 network->mode |= IEEE_G; 1382 if (network->flags & NETWORK_HAS_CCK) 1383 network->mode |= IEEE_B; 1384 } 1385 1386 memcpy(&network->stats, stats, sizeof(network->stats)); 1387 1388 if (ieee->handle_assoc_response != NULL) 1389 ieee->handle_assoc_response(dev, frame, network); 1390 1391 return 0; 1392} 1393 1394/***************************************************/ 1395 1396static int libipw_network_init(struct libipw_device *ieee, struct libipw_probe_response 1397 *beacon, 1398 struct libipw_network *network, 1399 struct libipw_rx_stats *stats) 1400{ 1401 DECLARE_SSID_BUF(ssid); 1402 1403 network->qos_data.active = 0; 1404 network->qos_data.supported = 0; 1405 network->qos_data.param_count = 0; 1406 network->qos_data.old_param_count = 0; 1407 1408 /* Pull out fixed field data */ 1409 memcpy(network->bssid, beacon->header.addr3, ETH_ALEN); 1410 network->capability = le16_to_cpu(beacon->capability); 1411 network->last_scanned = jiffies; 1412 network->time_stamp[0] = le32_to_cpu(beacon->time_stamp[0]); 1413 network->time_stamp[1] = le32_to_cpu(beacon->time_stamp[1]); 1414 network->beacon_interval = le16_to_cpu(beacon->beacon_interval); 1415 /* Where to pull this? beacon->listen_interval; */ 1416 network->listen_interval = 0x0A; 1417 network->rates_len = network->rates_ex_len = 0; 1418 network->last_associate = 0; 1419 network->ssid_len = 0; 1420 network->flags = 0; 1421 network->atim_window = 0; 1422 network->erp_value = (network->capability & WLAN_CAPABILITY_IBSS) ? 1423 0x3 : 0x0; 1424 1425 if (stats->freq == LIBIPW_52GHZ_BAND) { 1426 /* for A band (No DS info) */ 1427 network->channel = stats->received_channel; 1428 } else 1429 network->flags |= NETWORK_HAS_CCK; 1430 1431 network->wpa_ie_len = 0; 1432 network->rsn_ie_len = 0; 1433 1434 if (libipw_parse_info_param 1435 (beacon->info_element, stats->len - sizeof(*beacon), network)) 1436 return 1; 1437 1438 network->mode = 0; 1439 if (stats->freq == LIBIPW_52GHZ_BAND) 1440 network->mode = IEEE_A; 1441 else { 1442 if (network->flags & NETWORK_HAS_OFDM) 1443 network->mode |= IEEE_G; 1444 if (network->flags & NETWORK_HAS_CCK) 1445 network->mode |= IEEE_B; 1446 } 1447 1448 if (network->mode == 0) { 1449 LIBIPW_DEBUG_SCAN("Filtered out '%s (%pM)' " 1450 "network.\n", 1451 print_ssid(ssid, network->ssid, 1452 network->ssid_len), 1453 network->bssid); 1454 return 1; 1455 } 1456 1457 memcpy(&network->stats, stats, sizeof(network->stats)); 1458 1459 return 0; 1460} 1461 1462static inline int is_same_network(struct libipw_network *src, 1463 struct libipw_network *dst) 1464{ 1465 /* A network is only a duplicate if the channel, BSSID, and ESSID 1466 * all match. We treat all <hidden> with the same BSSID and channel 1467 * as one network */ 1468 return ((src->ssid_len == dst->ssid_len) && 1469 (src->channel == dst->channel) && 1470 !compare_ether_addr(src->bssid, dst->bssid) && 1471 !memcmp(src->ssid, dst->ssid, src->ssid_len)); 1472} 1473 1474static void update_network(struct libipw_network *dst, 1475 struct libipw_network *src) 1476{ 1477 int qos_active; 1478 u8 old_param; 1479 1480 libipw_network_reset(dst); 1481 dst->ibss_dfs = src->ibss_dfs; 1482 1483 /* We only update the statistics if they were created by receiving 1484 * the network information on the actual channel the network is on. 1485 * 1486 * This keeps beacons received on neighbor channels from bringing 1487 * down the signal level of an AP. */ 1488 if (dst->channel == src->stats.received_channel) 1489 memcpy(&dst->stats, &src->stats, 1490 sizeof(struct libipw_rx_stats)); 1491 else 1492 LIBIPW_DEBUG_SCAN("Network %pM info received " 1493 "off channel (%d vs. %d)\n", src->bssid, 1494 dst->channel, src->stats.received_channel); 1495 1496 dst->capability = src->capability; 1497 memcpy(dst->rates, src->rates, src->rates_len); 1498 dst->rates_len = src->rates_len; 1499 memcpy(dst->rates_ex, src->rates_ex, src->rates_ex_len); 1500 dst->rates_ex_len = src->rates_ex_len; 1501 1502 dst->mode = src->mode; 1503 dst->flags = src->flags; 1504 dst->time_stamp[0] = src->time_stamp[0]; 1505 dst->time_stamp[1] = src->time_stamp[1]; 1506 1507 dst->beacon_interval = src->beacon_interval; 1508 dst->listen_interval = src->listen_interval; 1509 dst->atim_window = src->atim_window; 1510 dst->erp_value = src->erp_value; 1511 dst->tim = src->tim; 1512 1513 memcpy(dst->wpa_ie, src->wpa_ie, src->wpa_ie_len); 1514 dst->wpa_ie_len = src->wpa_ie_len; 1515 memcpy(dst->rsn_ie, src->rsn_ie, src->rsn_ie_len); 1516 dst->rsn_ie_len = src->rsn_ie_len; 1517 1518 dst->last_scanned = jiffies; 1519 qos_active = src->qos_data.active; 1520 old_param = dst->qos_data.old_param_count; 1521 if (dst->flags & NETWORK_HAS_QOS_MASK) 1522 memcpy(&dst->qos_data, &src->qos_data, 1523 sizeof(struct libipw_qos_data)); 1524 else { 1525 dst->qos_data.supported = src->qos_data.supported; 1526 dst->qos_data.param_count = src->qos_data.param_count; 1527 } 1528 1529 if (dst->qos_data.supported == 1) { 1530 if (dst->ssid_len) 1531 LIBIPW_DEBUG_QOS 1532 ("QoS the network %s is QoS supported\n", 1533 dst->ssid); 1534 else 1535 LIBIPW_DEBUG_QOS 1536 ("QoS the network is QoS supported\n"); 1537 } 1538 dst->qos_data.active = qos_active; 1539 dst->qos_data.old_param_count = old_param; 1540 1541 /* dst->last_associate is not overwritten */ 1542} 1543 1544static inline int is_beacon(__le16 fc) 1545{ 1546 return (WLAN_FC_GET_STYPE(le16_to_cpu(fc)) == IEEE80211_STYPE_BEACON); 1547} 1548 1549static void libipw_process_probe_response(struct libipw_device 1550 *ieee, struct 1551 libipw_probe_response 1552 *beacon, struct libipw_rx_stats 1553 *stats) 1554{ 1555 struct net_device *dev = ieee->dev; 1556 struct libipw_network network = { 1557 .ibss_dfs = NULL, 1558 }; 1559 struct libipw_network *target; 1560 struct libipw_network *oldest = NULL; 1561#ifdef CONFIG_LIBIPW_DEBUG 1562 struct libipw_info_element *info_element = beacon->info_element; 1563#endif 1564 unsigned long flags; 1565 DECLARE_SSID_BUF(ssid); 1566 1567 LIBIPW_DEBUG_SCAN("'%s' (%pM" 1568 "): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n", 1569 print_ssid(ssid, info_element->data, info_element->len), 1570 beacon->header.addr3, 1571 (beacon->capability & cpu_to_le16(1 << 0xf)) ? '1' : '0', 1572 (beacon->capability & cpu_to_le16(1 << 0xe)) ? '1' : '0', 1573 (beacon->capability & cpu_to_le16(1 << 0xd)) ? '1' : '0', 1574 (beacon->capability & cpu_to_le16(1 << 0xc)) ? '1' : '0', 1575 (beacon->capability & cpu_to_le16(1 << 0xb)) ? '1' : '0', 1576 (beacon->capability & cpu_to_le16(1 << 0xa)) ? '1' : '0', 1577 (beacon->capability & cpu_to_le16(1 << 0x9)) ? '1' : '0', 1578 (beacon->capability & cpu_to_le16(1 << 0x8)) ? '1' : '0', 1579 (beacon->capability & cpu_to_le16(1 << 0x7)) ? '1' : '0', 1580 (beacon->capability & cpu_to_le16(1 << 0x6)) ? '1' : '0', 1581 (beacon->capability & cpu_to_le16(1 << 0x5)) ? '1' : '0', 1582 (beacon->capability & cpu_to_le16(1 << 0x4)) ? '1' : '0', 1583 (beacon->capability & cpu_to_le16(1 << 0x3)) ? '1' : '0', 1584 (beacon->capability & cpu_to_le16(1 << 0x2)) ? '1' : '0', 1585 (beacon->capability & cpu_to_le16(1 << 0x1)) ? '1' : '0', 1586 (beacon->capability & cpu_to_le16(1 << 0x0)) ? '1' : '0'); 1587 1588 if (libipw_network_init(ieee, beacon, &network, stats)) { 1589 LIBIPW_DEBUG_SCAN("Dropped '%s' (%pM) via %s.\n", 1590 print_ssid(ssid, info_element->data, 1591 info_element->len), 1592 beacon->header.addr3, 1593 is_beacon(beacon->header.frame_ctl) ? 1594 "BEACON" : "PROBE RESPONSE"); 1595 return; 1596 } 1597 1598 /* The network parsed correctly -- so now we scan our known networks 1599 * to see if we can find it in our list. 1600 * 1601 * NOTE: This search is definitely not optimized. Once its doing 1602 * the "right thing" we'll optimize it for efficiency if 1603 * necessary */ 1604 1605 /* Search for this entry in the list and update it if it is 1606 * already there. */ 1607 1608 spin_lock_irqsave(&ieee->lock, flags); 1609 1610 list_for_each_entry(target, &ieee->network_list, list) { 1611 if (is_same_network(target, &network)) 1612 break; 1613 1614 if ((oldest == NULL) || 1615 time_before(target->last_scanned, oldest->last_scanned)) 1616 oldest = target; 1617 } 1618 1619 /* If we didn't find a match, then get a new network slot to initialize 1620 * with this beacon's information */ 1621 if (&target->list == &ieee->network_list) { 1622 if (list_empty(&ieee->network_free_list)) { 1623 /* If there are no more slots, expire the oldest */ 1624 list_del(&oldest->list); 1625 target = oldest; 1626 LIBIPW_DEBUG_SCAN("Expired '%s' (%pM) from " 1627 "network list.\n", 1628 print_ssid(ssid, target->ssid, 1629 target->ssid_len), 1630 target->bssid); 1631 libipw_network_reset(target); 1632 } else { 1633 /* Otherwise just pull from the free list */ 1634 target = list_entry(ieee->network_free_list.next, 1635 struct libipw_network, list); 1636 list_del(ieee->network_free_list.next); 1637 } 1638 1639#ifdef CONFIG_LIBIPW_DEBUG 1640 LIBIPW_DEBUG_SCAN("Adding '%s' (%pM) via %s.\n", 1641 print_ssid(ssid, network.ssid, 1642 network.ssid_len), 1643 network.bssid, 1644 is_beacon(beacon->header.frame_ctl) ? 1645 "BEACON" : "PROBE RESPONSE"); 1646#endif 1647 memcpy(target, &network, sizeof(*target)); 1648 network.ibss_dfs = NULL; 1649 list_add_tail(&target->list, &ieee->network_list); 1650 } else { 1651 LIBIPW_DEBUG_SCAN("Updating '%s' (%pM) via %s.\n", 1652 print_ssid(ssid, target->ssid, 1653 target->ssid_len), 1654 target->bssid, 1655 is_beacon(beacon->header.frame_ctl) ? 1656 "BEACON" : "PROBE RESPONSE"); 1657 update_network(target, &network); 1658 network.ibss_dfs = NULL; 1659 } 1660 1661 spin_unlock_irqrestore(&ieee->lock, flags); 1662 1663 if (is_beacon(beacon->header.frame_ctl)) { 1664 if (ieee->handle_beacon != NULL) 1665 ieee->handle_beacon(dev, beacon, target); 1666 } else { 1667 if (ieee->handle_probe_response != NULL) 1668 ieee->handle_probe_response(dev, beacon, target); 1669 } 1670} 1671 1672void libipw_rx_mgt(struct libipw_device *ieee, 1673 struct libipw_hdr_4addr *header, 1674 struct libipw_rx_stats *stats) 1675{ 1676 switch (WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl))) { 1677 case IEEE80211_STYPE_ASSOC_RESP: 1678 LIBIPW_DEBUG_MGMT("received ASSOCIATION RESPONSE (%d)\n", 1679 WLAN_FC_GET_STYPE(le16_to_cpu 1680 (header->frame_ctl))); 1681 libipw_handle_assoc_resp(ieee, 1682 (struct libipw_assoc_response *) 1683 header, stats); 1684 break; 1685 1686 case IEEE80211_STYPE_REASSOC_RESP: 1687 LIBIPW_DEBUG_MGMT("received REASSOCIATION RESPONSE (%d)\n", 1688 WLAN_FC_GET_STYPE(le16_to_cpu 1689 (header->frame_ctl))); 1690 break; 1691 1692 case IEEE80211_STYPE_PROBE_REQ: 1693 LIBIPW_DEBUG_MGMT("received auth (%d)\n", 1694 WLAN_FC_GET_STYPE(le16_to_cpu 1695 (header->frame_ctl))); 1696 1697 if (ieee->handle_probe_request != NULL) 1698 ieee->handle_probe_request(ieee->dev, 1699 (struct 1700 libipw_probe_request *) 1701 header, stats); 1702 break; 1703 1704 case IEEE80211_STYPE_PROBE_RESP: 1705 LIBIPW_DEBUG_MGMT("received PROBE RESPONSE (%d)\n", 1706 WLAN_FC_GET_STYPE(le16_to_cpu 1707 (header->frame_ctl))); 1708 LIBIPW_DEBUG_SCAN("Probe response\n"); 1709 libipw_process_probe_response(ieee, 1710 (struct 1711 libipw_probe_response *) 1712 header, stats); 1713 break; 1714 1715 case IEEE80211_STYPE_BEACON: 1716 LIBIPW_DEBUG_MGMT("received BEACON (%d)\n", 1717 WLAN_FC_GET_STYPE(le16_to_cpu 1718 (header->frame_ctl))); 1719 LIBIPW_DEBUG_SCAN("Beacon\n"); 1720 libipw_process_probe_response(ieee, 1721 (struct 1722 libipw_probe_response *) 1723 header, stats); 1724 break; 1725 case IEEE80211_STYPE_AUTH: 1726 1727 LIBIPW_DEBUG_MGMT("received auth (%d)\n", 1728 WLAN_FC_GET_STYPE(le16_to_cpu 1729 (header->frame_ctl))); 1730 1731 if (ieee->handle_auth != NULL) 1732 ieee->handle_auth(ieee->dev, 1733 (struct libipw_auth *)header); 1734 break; 1735 1736 case IEEE80211_STYPE_DISASSOC: 1737 if (ieee->handle_disassoc != NULL) 1738 ieee->handle_disassoc(ieee->dev, 1739 (struct libipw_disassoc *) 1740 header); 1741 break; 1742 1743 case IEEE80211_STYPE_ACTION: 1744 LIBIPW_DEBUG_MGMT("ACTION\n"); 1745 if (ieee->handle_action) 1746 ieee->handle_action(ieee->dev, 1747 (struct libipw_action *) 1748 header, stats); 1749 break; 1750 1751 case IEEE80211_STYPE_REASSOC_REQ: 1752 LIBIPW_DEBUG_MGMT("received reassoc (%d)\n", 1753 WLAN_FC_GET_STYPE(le16_to_cpu 1754 (header->frame_ctl))); 1755 1756 LIBIPW_DEBUG_MGMT("%s: LIBIPW_REASSOC_REQ received\n", 1757 ieee->dev->name); 1758 if (ieee->handle_reassoc_request != NULL) 1759 ieee->handle_reassoc_request(ieee->dev, 1760 (struct libipw_reassoc_request *) 1761 header); 1762 break; 1763 1764 case IEEE80211_STYPE_ASSOC_REQ: 1765 LIBIPW_DEBUG_MGMT("received assoc (%d)\n", 1766 WLAN_FC_GET_STYPE(le16_to_cpu 1767 (header->frame_ctl))); 1768 1769 LIBIPW_DEBUG_MGMT("%s: LIBIPW_ASSOC_REQ received\n", 1770 ieee->dev->name); 1771 if (ieee->handle_assoc_request != NULL) 1772 ieee->handle_assoc_request(ieee->dev); 1773 break; 1774 1775 case IEEE80211_STYPE_DEAUTH: 1776 LIBIPW_DEBUG_MGMT("DEAUTH\n"); 1777 if (ieee->handle_deauth != NULL) 1778 ieee->handle_deauth(ieee->dev, 1779 (struct libipw_deauth *) 1780 header); 1781 break; 1782 default: 1783 LIBIPW_DEBUG_MGMT("received UNKNOWN (%d)\n", 1784 WLAN_FC_GET_STYPE(le16_to_cpu 1785 (header->frame_ctl))); 1786 LIBIPW_DEBUG_MGMT("%s: Unknown management packet: %d\n", 1787 ieee->dev->name, 1788 WLAN_FC_GET_STYPE(le16_to_cpu 1789 (header->frame_ctl))); 1790 break; 1791 } 1792} 1793 1794EXPORT_SYMBOL_GPL(libipw_rx_any); 1795EXPORT_SYMBOL(libipw_rx_mgt); 1796EXPORT_SYMBOL(libipw_rx); 1797