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 39 static 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) */ 56 static 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 ether_addr_equal(entry->src_addr, src) && 81 ether_addr_equal(entry->dst_addr, dst)) 82 return entry; 83 } 84 85 return NULL; 86 } 87 88 /* Called only as a tasklet (software IRQ) */ 89 static 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) */ 140 static 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 */ 169 static int 170 libipw_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 supported.\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) */ 222 static 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) */ 226 static 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 */ 231 static 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 ether_addr_equal(hdr->addr1, dev->dev_addr) && 249 ether_addr_equal(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 ether_addr_equal(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 */ 271 static int 272 libipw_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 */ 302 static int 303 libipw_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). */ 332 int 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 (is_unicast_ether_addr(hdr->addr1) || 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 ether_addr_equal(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 // PR: FIXME: hostap has additional conditions in the "if" below: 581 // ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) && 582 if ((frag != 0) || (fc & IEEE80211_FCTL_MOREFRAGS)) { 583 int flen; 584 struct sk_buff *frag_skb = libipw_frag_cache_get(ieee, hdr); 585 LIBIPW_DEBUG_FRAG("Rx Fragment received (%u)\n", frag); 586 587 if (!frag_skb) { 588 LIBIPW_DEBUG(LIBIPW_DL_RX | LIBIPW_DL_FRAG, 589 "Rx cannot get skb from fragment " 590 "cache (morefrag=%d seq=%u frag=%u)\n", 591 (fc & IEEE80211_FCTL_MOREFRAGS) != 0, 592 WLAN_GET_SEQ_SEQ(sc), frag); 593 goto rx_dropped; 594 } 595 596 flen = skb->len; 597 if (frag != 0) 598 flen -= hdrlen; 599 600 if (frag_skb->tail + flen > frag_skb->end) { 601 printk(KERN_WARNING "%s: host decrypted and " 602 "reassembled frame did not fit skb\n", 603 dev->name); 604 libipw_frag_cache_invalidate(ieee, hdr); 605 goto rx_dropped; 606 } 607 608 if (frag == 0) { 609 /* copy first fragment (including full headers) into 610 * beginning of the fragment cache skb */ 611 skb_copy_from_linear_data(skb, skb_put(frag_skb, flen), flen); 612 } else { 613 /* append frame payload to the end of the fragment 614 * cache skb */ 615 skb_copy_from_linear_data_offset(skb, hdrlen, 616 skb_put(frag_skb, flen), flen); 617 } 618 dev_kfree_skb_any(skb); 619 skb = NULL; 620 621 if (fc & IEEE80211_FCTL_MOREFRAGS) { 622 /* more fragments expected - leave the skb in fragment 623 * cache for now; it will be delivered to upper layers 624 * after all fragments have been received */ 625 goto rx_exit; 626 } 627 628 /* this was the last fragment and the frame will be 629 * delivered, so remove skb from fragment cache */ 630 skb = frag_skb; 631 hdr = (struct libipw_hdr_4addr *)skb->data; 632 libipw_frag_cache_invalidate(ieee, hdr); 633 } 634 635 /* skb: hdr + (possible reassembled) full MSDU payload; possibly still 636 * encrypted/authenticated */ 637 if ((fc & IEEE80211_FCTL_PROTECTED) && can_be_decrypted && 638 libipw_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt)) 639 goto rx_dropped; 640 641 hdr = (struct libipw_hdr_4addr *)skb->data; 642 if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep) { 643 if ( /*ieee->ieee802_1x && */ 644 libipw_is_eapol_frame(ieee, skb)) { 645 /* pass unencrypted EAPOL frames even if encryption is 646 * configured */ 647 } else { 648 LIBIPW_DEBUG_DROP("encryption configured, but RX " 649 "frame not encrypted (SA=%pM)\n", 650 hdr->addr2); 651 goto rx_dropped; 652 } 653 } 654 655 if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep && 656 !libipw_is_eapol_frame(ieee, skb)) { 657 LIBIPW_DEBUG_DROP("dropped unencrypted RX data " 658 "frame from %pM (drop_unencrypted=1)\n", 659 hdr->addr2); 660 goto rx_dropped; 661 } 662 663 /* If the frame was decrypted in hardware, we may need to strip off 664 * any security data (IV, ICV, etc) that was left behind */ 665 if (!can_be_decrypted && (fc & IEEE80211_FCTL_PROTECTED) && 666 ieee->host_strip_iv_icv) { 667 int trimlen = 0; 668 669 /* Top two-bits of byte 3 are the key index */ 670 if (skb->len >= hdrlen + 3) 671 keyidx = skb->data[hdrlen + 3] >> 6; 672 673 /* To strip off any security data which appears before the 674 * payload, we simply increase hdrlen (as the header gets 675 * chopped off immediately below). For the security data which 676 * appears after the payload, we use skb_trim. */ 677 678 switch (ieee->sec.encode_alg[keyidx]) { 679 case SEC_ALG_WEP: 680 /* 4 byte IV */ 681 hdrlen += 4; 682 /* 4 byte ICV */ 683 trimlen = 4; 684 break; 685 case SEC_ALG_TKIP: 686 /* 4 byte IV, 4 byte ExtIV */ 687 hdrlen += 8; 688 /* 8 byte MIC, 4 byte ICV */ 689 trimlen = 12; 690 break; 691 case SEC_ALG_CCMP: 692 /* 8 byte CCMP header */ 693 hdrlen += 8; 694 /* 8 byte MIC */ 695 trimlen = 8; 696 break; 697 } 698 699 if (skb->len < trimlen) 700 goto rx_dropped; 701 702 __skb_trim(skb, skb->len - trimlen); 703 704 if (skb->len < hdrlen) 705 goto rx_dropped; 706 } 707 708 /* skb: hdr + (possible reassembled) full plaintext payload */ 709 710 payload = skb->data + hdrlen; 711 ethertype = (payload[6] << 8) | payload[7]; 712 713 #ifdef NOT_YET 714 /* If IEEE 802.1X is used, check whether the port is authorized to send 715 * the received frame. */ 716 if (ieee->ieee802_1x && ieee->iw_mode == IW_MODE_MASTER) { 717 if (ethertype == ETH_P_PAE) { 718 printk(KERN_DEBUG "%s: RX: IEEE 802.1X frame\n", 719 dev->name); 720 if (ieee->hostapd && ieee->apdev) { 721 /* Send IEEE 802.1X frames to the user 722 * space daemon for processing */ 723 prism2_rx_80211(ieee->apdev, skb, rx_stats, 724 PRISM2_RX_MGMT); 725 ieee->apdevstats.rx_packets++; 726 ieee->apdevstats.rx_bytes += skb->len; 727 goto rx_exit; 728 } 729 } else if (!frame_authorized) { 730 printk(KERN_DEBUG "%s: dropped frame from " 731 "unauthorized port (IEEE 802.1X): " 732 "ethertype=0x%04x\n", dev->name, ethertype); 733 goto rx_dropped; 734 } 735 } 736 #endif 737 738 /* convert hdr + possible LLC headers into Ethernet header */ 739 if (skb->len - hdrlen >= 8 && 740 ((memcmp(payload, libipw_rfc1042_header, SNAP_SIZE) == 0 && 741 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || 742 memcmp(payload, libipw_bridge_tunnel_header, SNAP_SIZE) == 0)) { 743 /* remove RFC1042 or Bridge-Tunnel encapsulation and 744 * replace EtherType */ 745 skb_pull(skb, hdrlen + SNAP_SIZE); 746 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); 747 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); 748 } else { 749 __be16 len; 750 /* Leave Ethernet header part of hdr and full payload */ 751 skb_pull(skb, hdrlen); 752 len = htons(skb->len); 753 memcpy(skb_push(skb, 2), &len, 2); 754 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); 755 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); 756 } 757 758 #ifdef NOT_YET 759 if (wds && ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == 760 IEEE80211_FCTL_TODS) && skb->len >= ETH_HLEN + ETH_ALEN) { 761 /* Non-standard frame: get addr4 from its bogus location after 762 * the payload */ 763 skb_copy_to_linear_data_offset(skb, ETH_ALEN, 764 skb->data + skb->len - ETH_ALEN, 765 ETH_ALEN); 766 skb_trim(skb, skb->len - ETH_ALEN); 767 } 768 #endif 769 770 dev->stats.rx_packets++; 771 dev->stats.rx_bytes += skb->len; 772 773 #ifdef NOT_YET 774 if (ieee->iw_mode == IW_MODE_MASTER && !wds && ieee->ap->bridge_packets) { 775 if (is_multicast_ether_addr(dst)) { 776 /* copy multicast frame both to the higher layers and 777 * to the wireless media */ 778 ieee->ap->bridged_multicast++; 779 skb2 = skb_clone(skb, GFP_ATOMIC); 780 if (skb2 == NULL) 781 printk(KERN_DEBUG "%s: skb_clone failed for " 782 "multicast frame\n", dev->name); 783 } else if (hostap_is_sta_assoc(ieee->ap, dst)) { 784 /* send frame directly to the associated STA using 785 * wireless media and not passing to higher layers */ 786 ieee->ap->bridged_unicast++; 787 skb2 = skb; 788 skb = NULL; 789 } 790 } 791 792 if (skb2 != NULL) { 793 /* send to wireless media */ 794 skb2->dev = dev; 795 skb2->protocol = htons(ETH_P_802_3); 796 skb_reset_mac_header(skb2); 797 skb_reset_network_header(skb2); 798 /* skb2->network_header += ETH_HLEN; */ 799 dev_queue_xmit(skb2); 800 } 801 #endif 802 803 if (skb) { 804 skb->protocol = eth_type_trans(skb, dev); 805 memset(skb->cb, 0, sizeof(skb->cb)); 806 skb->ip_summed = CHECKSUM_NONE; /* 802.11 crc not sufficient */ 807 if (netif_rx(skb) == NET_RX_DROP) { 808 /* netif_rx always succeeds, but it might drop 809 * the packet. If it drops the packet, we log that 810 * in our stats. */ 811 LIBIPW_DEBUG_DROP 812 ("RX: netif_rx dropped the packet\n"); 813 dev->stats.rx_dropped++; 814 } 815 } 816 817 rx_exit: 818 #ifdef NOT_YET 819 if (sta) 820 hostap_handle_sta_release(sta); 821 #endif 822 return 1; 823 824 rx_dropped: 825 dev->stats.rx_dropped++; 826 827 /* Returning 0 indicates to caller that we have not handled the SKB-- 828 * so it is still allocated and can be used again by underlying 829 * hardware as a DMA target */ 830 return 0; 831 } 832 833 /* Filter out unrelated packets, call libipw_rx[_mgt] 834 * This function takes over the skb, it should not be used again after calling 835 * this function. */ 836 void libipw_rx_any(struct libipw_device *ieee, 837 struct sk_buff *skb, struct libipw_rx_stats *stats) 838 { 839 struct libipw_hdr_4addr *hdr; 840 int is_packet_for_us; 841 u16 fc; 842 843 if (ieee->iw_mode == IW_MODE_MONITOR) { 844 if (!libipw_rx(ieee, skb, stats)) 845 dev_kfree_skb_irq(skb); 846 return; 847 } 848 849 if (skb->len < sizeof(struct ieee80211_hdr)) 850 goto drop_free; 851 852 hdr = (struct libipw_hdr_4addr *)skb->data; 853 fc = le16_to_cpu(hdr->frame_ctl); 854 855 if ((fc & IEEE80211_FCTL_VERS) != 0) 856 goto drop_free; 857 858 switch (fc & IEEE80211_FCTL_FTYPE) { 859 case IEEE80211_FTYPE_MGMT: 860 if (skb->len < sizeof(struct libipw_hdr_3addr)) 861 goto drop_free; 862 libipw_rx_mgt(ieee, hdr, stats); 863 dev_kfree_skb_irq(skb); 864 return; 865 case IEEE80211_FTYPE_DATA: 866 break; 867 case IEEE80211_FTYPE_CTL: 868 return; 869 default: 870 return; 871 } 872 873 is_packet_for_us = 0; 874 switch (ieee->iw_mode) { 875 case IW_MODE_ADHOC: 876 /* our BSS and not from/to DS */ 877 if (ether_addr_equal(hdr->addr3, ieee->bssid)) 878 if ((fc & (IEEE80211_FCTL_TODS+IEEE80211_FCTL_FROMDS)) == 0) { 879 /* promisc: get all */ 880 if (ieee->dev->flags & IFF_PROMISC) 881 is_packet_for_us = 1; 882 /* to us */ 883 else if (ether_addr_equal(hdr->addr1, ieee->dev->dev_addr)) 884 is_packet_for_us = 1; 885 /* mcast */ 886 else if (is_multicast_ether_addr(hdr->addr1)) 887 is_packet_for_us = 1; 888 } 889 break; 890 case IW_MODE_INFRA: 891 /* our BSS (== from our AP) and from DS */ 892 if (ether_addr_equal(hdr->addr2, ieee->bssid)) 893 if ((fc & (IEEE80211_FCTL_TODS+IEEE80211_FCTL_FROMDS)) == IEEE80211_FCTL_FROMDS) { 894 /* promisc: get all */ 895 if (ieee->dev->flags & IFF_PROMISC) 896 is_packet_for_us = 1; 897 /* to us */ 898 else if (ether_addr_equal(hdr->addr1, ieee->dev->dev_addr)) 899 is_packet_for_us = 1; 900 /* mcast */ 901 else if (is_multicast_ether_addr(hdr->addr1)) { 902 /* not our own packet bcasted from AP */ 903 if (!ether_addr_equal(hdr->addr3, ieee->dev->dev_addr)) 904 is_packet_for_us = 1; 905 } 906 } 907 break; 908 default: 909 /* ? */ 910 break; 911 } 912 913 if (is_packet_for_us) 914 if (!libipw_rx(ieee, skb, stats)) 915 dev_kfree_skb_irq(skb); 916 return; 917 918 drop_free: 919 dev_kfree_skb_irq(skb); 920 ieee->dev->stats.rx_dropped++; 921 } 922 923 #define MGMT_FRAME_FIXED_PART_LENGTH 0x24 924 925 static u8 qos_oui[QOS_OUI_LEN] = { 0x00, 0x50, 0xF2 }; 926 927 /* 928 * Make the structure we read from the beacon packet to have 929 * the right values 930 */ 931 static int libipw_verify_qos_info(struct libipw_qos_information_element 932 *info_element, int sub_type) 933 { 934 935 if (info_element->qui_subtype != sub_type) 936 return -1; 937 if (memcmp(info_element->qui, qos_oui, QOS_OUI_LEN)) 938 return -1; 939 if (info_element->qui_type != QOS_OUI_TYPE) 940 return -1; 941 if (info_element->version != QOS_VERSION_1) 942 return -1; 943 944 return 0; 945 } 946 947 /* 948 * Parse a QoS parameter element 949 */ 950 static int libipw_read_qos_param_element(struct libipw_qos_parameter_info 951 *element_param, struct libipw_info_element 952 *info_element) 953 { 954 int ret = 0; 955 u16 size = sizeof(struct libipw_qos_parameter_info) - 2; 956 957 if ((info_element == NULL) || (element_param == NULL)) 958 return -1; 959 960 if (info_element->id == QOS_ELEMENT_ID && info_element->len == size) { 961 memcpy(element_param->info_element.qui, info_element->data, 962 info_element->len); 963 element_param->info_element.elementID = info_element->id; 964 element_param->info_element.length = info_element->len; 965 } else 966 ret = -1; 967 if (ret == 0) 968 ret = libipw_verify_qos_info(&element_param->info_element, 969 QOS_OUI_PARAM_SUB_TYPE); 970 return ret; 971 } 972 973 /* 974 * Parse a QoS information element 975 */ 976 static int libipw_read_qos_info_element(struct 977 libipw_qos_information_element 978 *element_info, struct libipw_info_element 979 *info_element) 980 { 981 int ret = 0; 982 u16 size = sizeof(struct libipw_qos_information_element) - 2; 983 984 if (element_info == NULL) 985 return -1; 986 if (info_element == NULL) 987 return -1; 988 989 if ((info_element->id == QOS_ELEMENT_ID) && (info_element->len == size)) { 990 memcpy(element_info->qui, info_element->data, 991 info_element->len); 992 element_info->elementID = info_element->id; 993 element_info->length = info_element->len; 994 } else 995 ret = -1; 996 997 if (ret == 0) 998 ret = libipw_verify_qos_info(element_info, 999 QOS_OUI_INFO_SUB_TYPE); 1000 return ret; 1001 } 1002 1003 /* 1004 * Write QoS parameters from the ac parameters. 1005 */ 1006 static int libipw_qos_convert_ac_to_parameters(struct 1007 libipw_qos_parameter_info 1008 *param_elm, struct 1009 libipw_qos_parameters 1010 *qos_param) 1011 { 1012 int rc = 0; 1013 int i; 1014 struct libipw_qos_ac_parameter *ac_params; 1015 u32 txop; 1016 u8 cw_min; 1017 u8 cw_max; 1018 1019 for (i = 0; i < QOS_QUEUE_NUM; i++) { 1020 ac_params = &(param_elm->ac_params_record[i]); 1021 1022 qos_param->aifs[i] = (ac_params->aci_aifsn) & 0x0F; 1023 qos_param->aifs[i] -= (qos_param->aifs[i] < 2) ? 0 : 2; 1024 1025 cw_min = ac_params->ecw_min_max & 0x0F; 1026 qos_param->cw_min[i] = cpu_to_le16((1 << cw_min) - 1); 1027 1028 cw_max = (ac_params->ecw_min_max & 0xF0) >> 4; 1029 qos_param->cw_max[i] = cpu_to_le16((1 << cw_max) - 1); 1030 1031 qos_param->flag[i] = 1032 (ac_params->aci_aifsn & 0x10) ? 0x01 : 0x00; 1033 1034 txop = le16_to_cpu(ac_params->tx_op_limit) * 32; 1035 qos_param->tx_op_limit[i] = cpu_to_le16(txop); 1036 } 1037 return rc; 1038 } 1039 1040 /* 1041 * we have a generic data element which it may contain QoS information or 1042 * parameters element. check the information element length to decide 1043 * which type to read 1044 */ 1045 static int libipw_parse_qos_info_param_IE(struct libipw_info_element 1046 *info_element, 1047 struct libipw_network *network) 1048 { 1049 int rc = 0; 1050 struct libipw_qos_parameters *qos_param = NULL; 1051 struct libipw_qos_information_element qos_info_element; 1052 1053 rc = libipw_read_qos_info_element(&qos_info_element, info_element); 1054 1055 if (rc == 0) { 1056 network->qos_data.param_count = qos_info_element.ac_info & 0x0F; 1057 network->flags |= NETWORK_HAS_QOS_INFORMATION; 1058 } else { 1059 struct libipw_qos_parameter_info param_element; 1060 1061 rc = libipw_read_qos_param_element(¶m_element, 1062 info_element); 1063 if (rc == 0) { 1064 qos_param = &(network->qos_data.parameters); 1065 libipw_qos_convert_ac_to_parameters(¶m_element, 1066 qos_param); 1067 network->flags |= NETWORK_HAS_QOS_PARAMETERS; 1068 network->qos_data.param_count = 1069 param_element.info_element.ac_info & 0x0F; 1070 } 1071 } 1072 1073 if (rc == 0) { 1074 LIBIPW_DEBUG_QOS("QoS is supported\n"); 1075 network->qos_data.supported = 1; 1076 } 1077 return rc; 1078 } 1079 1080 #ifdef CONFIG_LIBIPW_DEBUG 1081 #define MFIE_STRING(x) case WLAN_EID_ ##x: return #x 1082 1083 static const char *get_info_element_string(u16 id) 1084 { 1085 switch (id) { 1086 MFIE_STRING(SSID); 1087 MFIE_STRING(SUPP_RATES); 1088 MFIE_STRING(FH_PARAMS); 1089 MFIE_STRING(DS_PARAMS); 1090 MFIE_STRING(CF_PARAMS); 1091 MFIE_STRING(TIM); 1092 MFIE_STRING(IBSS_PARAMS); 1093 MFIE_STRING(COUNTRY); 1094 MFIE_STRING(REQUEST); 1095 MFIE_STRING(CHALLENGE); 1096 MFIE_STRING(PWR_CONSTRAINT); 1097 MFIE_STRING(PWR_CAPABILITY); 1098 MFIE_STRING(TPC_REQUEST); 1099 MFIE_STRING(TPC_REPORT); 1100 MFIE_STRING(SUPPORTED_CHANNELS); 1101 MFIE_STRING(CHANNEL_SWITCH); 1102 MFIE_STRING(MEASURE_REQUEST); 1103 MFIE_STRING(MEASURE_REPORT); 1104 MFIE_STRING(QUIET); 1105 MFIE_STRING(IBSS_DFS); 1106 MFIE_STRING(ERP_INFO); 1107 MFIE_STRING(RSN); 1108 MFIE_STRING(EXT_SUPP_RATES); 1109 MFIE_STRING(VENDOR_SPECIFIC); 1110 MFIE_STRING(QOS_PARAMETER); 1111 default: 1112 return "UNKNOWN"; 1113 } 1114 } 1115 #endif 1116 1117 static int libipw_parse_info_param(struct libipw_info_element 1118 *info_element, u16 length, 1119 struct libipw_network *network) 1120 { 1121 u8 i; 1122 #ifdef CONFIG_LIBIPW_DEBUG 1123 char rates_str[64]; 1124 char *p; 1125 #endif 1126 1127 while (length >= sizeof(*info_element)) { 1128 if (sizeof(*info_element) + info_element->len > length) { 1129 LIBIPW_DEBUG_MGMT("Info elem: parse failed: " 1130 "info_element->len + 2 > left : " 1131 "info_element->len+2=%zd left=%d, id=%d.\n", 1132 info_element->len + 1133 sizeof(*info_element), 1134 length, info_element->id); 1135 /* We stop processing but don't return an error here 1136 * because some misbehaviour APs break this rule. ie. 1137 * Orinoco AP1000. */ 1138 break; 1139 } 1140 1141 switch (info_element->id) { 1142 case WLAN_EID_SSID: 1143 network->ssid_len = min(info_element->len, 1144 (u8) IW_ESSID_MAX_SIZE); 1145 memcpy(network->ssid, info_element->data, 1146 network->ssid_len); 1147 if (network->ssid_len < IW_ESSID_MAX_SIZE) 1148 memset(network->ssid + network->ssid_len, 0, 1149 IW_ESSID_MAX_SIZE - network->ssid_len); 1150 1151 LIBIPW_DEBUG_MGMT("WLAN_EID_SSID: '%*pE' len=%d.\n", 1152 network->ssid_len, network->ssid, 1153 network->ssid_len); 1154 break; 1155 1156 case WLAN_EID_SUPP_RATES: 1157 #ifdef CONFIG_LIBIPW_DEBUG 1158 p = rates_str; 1159 #endif 1160 network->rates_len = min(info_element->len, 1161 MAX_RATES_LENGTH); 1162 for (i = 0; i < network->rates_len; i++) { 1163 network->rates[i] = info_element->data[i]; 1164 #ifdef CONFIG_LIBIPW_DEBUG 1165 p += snprintf(p, sizeof(rates_str) - 1166 (p - rates_str), "%02X ", 1167 network->rates[i]); 1168 #endif 1169 if (libipw_is_ofdm_rate 1170 (info_element->data[i])) { 1171 network->flags |= NETWORK_HAS_OFDM; 1172 if (info_element->data[i] & 1173 LIBIPW_BASIC_RATE_MASK) 1174 network->flags &= 1175 ~NETWORK_HAS_CCK; 1176 } 1177 } 1178 1179 LIBIPW_DEBUG_MGMT("WLAN_EID_SUPP_RATES: '%s' (%d)\n", 1180 rates_str, network->rates_len); 1181 break; 1182 1183 case WLAN_EID_EXT_SUPP_RATES: 1184 #ifdef CONFIG_LIBIPW_DEBUG 1185 p = rates_str; 1186 #endif 1187 network->rates_ex_len = min(info_element->len, 1188 MAX_RATES_EX_LENGTH); 1189 for (i = 0; i < network->rates_ex_len; i++) { 1190 network->rates_ex[i] = info_element->data[i]; 1191 #ifdef CONFIG_LIBIPW_DEBUG 1192 p += snprintf(p, sizeof(rates_str) - 1193 (p - rates_str), "%02X ", 1194 network->rates_ex[i]); 1195 #endif 1196 if (libipw_is_ofdm_rate 1197 (info_element->data[i])) { 1198 network->flags |= NETWORK_HAS_OFDM; 1199 if (info_element->data[i] & 1200 LIBIPW_BASIC_RATE_MASK) 1201 network->flags &= 1202 ~NETWORK_HAS_CCK; 1203 } 1204 } 1205 1206 LIBIPW_DEBUG_MGMT("WLAN_EID_EXT_SUPP_RATES: '%s' (%d)\n", 1207 rates_str, network->rates_ex_len); 1208 break; 1209 1210 case WLAN_EID_DS_PARAMS: 1211 LIBIPW_DEBUG_MGMT("WLAN_EID_DS_PARAMS: %d\n", 1212 info_element->data[0]); 1213 network->channel = info_element->data[0]; 1214 break; 1215 1216 case WLAN_EID_FH_PARAMS: 1217 LIBIPW_DEBUG_MGMT("WLAN_EID_FH_PARAMS: ignored\n"); 1218 break; 1219 1220 case WLAN_EID_CF_PARAMS: 1221 LIBIPW_DEBUG_MGMT("WLAN_EID_CF_PARAMS: ignored\n"); 1222 break; 1223 1224 case WLAN_EID_TIM: 1225 network->tim.tim_count = info_element->data[0]; 1226 network->tim.tim_period = info_element->data[1]; 1227 LIBIPW_DEBUG_MGMT("WLAN_EID_TIM: partially ignored\n"); 1228 break; 1229 1230 case WLAN_EID_ERP_INFO: 1231 network->erp_value = info_element->data[0]; 1232 network->flags |= NETWORK_HAS_ERP_VALUE; 1233 LIBIPW_DEBUG_MGMT("MFIE_TYPE_ERP_SET: %d\n", 1234 network->erp_value); 1235 break; 1236 1237 case WLAN_EID_IBSS_PARAMS: 1238 network->atim_window = info_element->data[0]; 1239 LIBIPW_DEBUG_MGMT("WLAN_EID_IBSS_PARAMS: %d\n", 1240 network->atim_window); 1241 break; 1242 1243 case WLAN_EID_CHALLENGE: 1244 LIBIPW_DEBUG_MGMT("WLAN_EID_CHALLENGE: ignored\n"); 1245 break; 1246 1247 case WLAN_EID_VENDOR_SPECIFIC: 1248 LIBIPW_DEBUG_MGMT("WLAN_EID_VENDOR_SPECIFIC: %d bytes\n", 1249 info_element->len); 1250 if (!libipw_parse_qos_info_param_IE(info_element, 1251 network)) 1252 break; 1253 1254 if (info_element->len >= 4 && 1255 info_element->data[0] == 0x00 && 1256 info_element->data[1] == 0x50 && 1257 info_element->data[2] == 0xf2 && 1258 info_element->data[3] == 0x01) { 1259 network->wpa_ie_len = min(info_element->len + 2, 1260 MAX_WPA_IE_LEN); 1261 memcpy(network->wpa_ie, info_element, 1262 network->wpa_ie_len); 1263 } 1264 break; 1265 1266 case WLAN_EID_RSN: 1267 LIBIPW_DEBUG_MGMT("WLAN_EID_RSN: %d bytes\n", 1268 info_element->len); 1269 network->rsn_ie_len = min(info_element->len + 2, 1270 MAX_WPA_IE_LEN); 1271 memcpy(network->rsn_ie, info_element, 1272 network->rsn_ie_len); 1273 break; 1274 1275 case WLAN_EID_QOS_PARAMETER: 1276 printk(KERN_ERR 1277 "QoS Error need to parse QOS_PARAMETER IE\n"); 1278 break; 1279 /* 802.11h */ 1280 case WLAN_EID_PWR_CONSTRAINT: 1281 network->power_constraint = info_element->data[0]; 1282 network->flags |= NETWORK_HAS_POWER_CONSTRAINT; 1283 break; 1284 1285 case WLAN_EID_CHANNEL_SWITCH: 1286 network->power_constraint = info_element->data[0]; 1287 network->flags |= NETWORK_HAS_CSA; 1288 break; 1289 1290 case WLAN_EID_QUIET: 1291 network->quiet.count = info_element->data[0]; 1292 network->quiet.period = info_element->data[1]; 1293 network->quiet.duration = info_element->data[2]; 1294 network->quiet.offset = info_element->data[3]; 1295 network->flags |= NETWORK_HAS_QUIET; 1296 break; 1297 1298 case WLAN_EID_IBSS_DFS: 1299 network->flags |= NETWORK_HAS_IBSS_DFS; 1300 break; 1301 1302 case WLAN_EID_TPC_REPORT: 1303 network->tpc_report.transmit_power = 1304 info_element->data[0]; 1305 network->tpc_report.link_margin = info_element->data[1]; 1306 network->flags |= NETWORK_HAS_TPC_REPORT; 1307 break; 1308 1309 default: 1310 LIBIPW_DEBUG_MGMT 1311 ("Unsupported info element: %s (%d)\n", 1312 get_info_element_string(info_element->id), 1313 info_element->id); 1314 break; 1315 } 1316 1317 length -= sizeof(*info_element) + info_element->len; 1318 info_element = 1319 (struct libipw_info_element *)&info_element-> 1320 data[info_element->len]; 1321 } 1322 1323 return 0; 1324 } 1325 1326 static int libipw_handle_assoc_resp(struct libipw_device *ieee, struct libipw_assoc_response 1327 *frame, struct libipw_rx_stats *stats) 1328 { 1329 struct libipw_network network_resp = { }; 1330 struct libipw_network *network = &network_resp; 1331 struct net_device *dev = ieee->dev; 1332 1333 network->flags = 0; 1334 network->qos_data.active = 0; 1335 network->qos_data.supported = 0; 1336 network->qos_data.param_count = 0; 1337 network->qos_data.old_param_count = 0; 1338 1339 //network->atim_window = le16_to_cpu(frame->aid) & (0x3FFF); 1340 network->atim_window = le16_to_cpu(frame->aid); 1341 network->listen_interval = le16_to_cpu(frame->status); 1342 memcpy(network->bssid, frame->header.addr3, ETH_ALEN); 1343 network->capability = le16_to_cpu(frame->capability); 1344 network->last_scanned = jiffies; 1345 network->rates_len = network->rates_ex_len = 0; 1346 network->last_associate = 0; 1347 network->ssid_len = 0; 1348 network->erp_value = 1349 (network->capability & WLAN_CAPABILITY_IBSS) ? 0x3 : 0x0; 1350 1351 if (stats->freq == LIBIPW_52GHZ_BAND) { 1352 /* for A band (No DS info) */ 1353 network->channel = stats->received_channel; 1354 } else 1355 network->flags |= NETWORK_HAS_CCK; 1356 1357 network->wpa_ie_len = 0; 1358 network->rsn_ie_len = 0; 1359 1360 if (libipw_parse_info_param 1361 (frame->info_element, stats->len - sizeof(*frame), network)) 1362 return 1; 1363 1364 network->mode = 0; 1365 if (stats->freq == LIBIPW_52GHZ_BAND) 1366 network->mode = IEEE_A; 1367 else { 1368 if (network->flags & NETWORK_HAS_OFDM) 1369 network->mode |= IEEE_G; 1370 if (network->flags & NETWORK_HAS_CCK) 1371 network->mode |= IEEE_B; 1372 } 1373 1374 memcpy(&network->stats, stats, sizeof(network->stats)); 1375 1376 if (ieee->handle_assoc_response != NULL) 1377 ieee->handle_assoc_response(dev, frame, network); 1378 1379 return 0; 1380 } 1381 1382 /***************************************************/ 1383 1384 static int libipw_network_init(struct libipw_device *ieee, struct libipw_probe_response 1385 *beacon, 1386 struct libipw_network *network, 1387 struct libipw_rx_stats *stats) 1388 { 1389 network->qos_data.active = 0; 1390 network->qos_data.supported = 0; 1391 network->qos_data.param_count = 0; 1392 network->qos_data.old_param_count = 0; 1393 1394 /* Pull out fixed field data */ 1395 memcpy(network->bssid, beacon->header.addr3, ETH_ALEN); 1396 network->capability = le16_to_cpu(beacon->capability); 1397 network->last_scanned = jiffies; 1398 network->time_stamp[0] = le32_to_cpu(beacon->time_stamp[0]); 1399 network->time_stamp[1] = le32_to_cpu(beacon->time_stamp[1]); 1400 network->beacon_interval = le16_to_cpu(beacon->beacon_interval); 1401 /* Where to pull this? beacon->listen_interval; */ 1402 network->listen_interval = 0x0A; 1403 network->rates_len = network->rates_ex_len = 0; 1404 network->last_associate = 0; 1405 network->ssid_len = 0; 1406 network->flags = 0; 1407 network->atim_window = 0; 1408 network->erp_value = (network->capability & WLAN_CAPABILITY_IBSS) ? 1409 0x3 : 0x0; 1410 1411 if (stats->freq == LIBIPW_52GHZ_BAND) { 1412 /* for A band (No DS info) */ 1413 network->channel = stats->received_channel; 1414 } else 1415 network->flags |= NETWORK_HAS_CCK; 1416 1417 network->wpa_ie_len = 0; 1418 network->rsn_ie_len = 0; 1419 1420 if (libipw_parse_info_param 1421 (beacon->info_element, stats->len - sizeof(*beacon), network)) 1422 return 1; 1423 1424 network->mode = 0; 1425 if (stats->freq == LIBIPW_52GHZ_BAND) 1426 network->mode = IEEE_A; 1427 else { 1428 if (network->flags & NETWORK_HAS_OFDM) 1429 network->mode |= IEEE_G; 1430 if (network->flags & NETWORK_HAS_CCK) 1431 network->mode |= IEEE_B; 1432 } 1433 1434 if (network->mode == 0) { 1435 LIBIPW_DEBUG_SCAN("Filtered out '%*pE (%pM)' network.\n", 1436 network->ssid_len, network->ssid, 1437 network->bssid); 1438 return 1; 1439 } 1440 1441 memcpy(&network->stats, stats, sizeof(network->stats)); 1442 1443 return 0; 1444 } 1445 1446 static inline int is_same_network(struct libipw_network *src, 1447 struct libipw_network *dst) 1448 { 1449 /* A network is only a duplicate if the channel, BSSID, and ESSID 1450 * all match. We treat all <hidden> with the same BSSID and channel 1451 * as one network */ 1452 return ((src->ssid_len == dst->ssid_len) && 1453 (src->channel == dst->channel) && 1454 ether_addr_equal_64bits(src->bssid, dst->bssid) && 1455 !memcmp(src->ssid, dst->ssid, src->ssid_len)); 1456 } 1457 1458 static void update_network(struct libipw_network *dst, 1459 struct libipw_network *src) 1460 { 1461 int qos_active; 1462 u8 old_param; 1463 1464 /* We only update the statistics if they were created by receiving 1465 * the network information on the actual channel the network is on. 1466 * 1467 * This keeps beacons received on neighbor channels from bringing 1468 * down the signal level of an AP. */ 1469 if (dst->channel == src->stats.received_channel) 1470 memcpy(&dst->stats, &src->stats, 1471 sizeof(struct libipw_rx_stats)); 1472 else 1473 LIBIPW_DEBUG_SCAN("Network %pM info received " 1474 "off channel (%d vs. %d)\n", src->bssid, 1475 dst->channel, src->stats.received_channel); 1476 1477 dst->capability = src->capability; 1478 memcpy(dst->rates, src->rates, src->rates_len); 1479 dst->rates_len = src->rates_len; 1480 memcpy(dst->rates_ex, src->rates_ex, src->rates_ex_len); 1481 dst->rates_ex_len = src->rates_ex_len; 1482 1483 dst->mode = src->mode; 1484 dst->flags = src->flags; 1485 dst->time_stamp[0] = src->time_stamp[0]; 1486 dst->time_stamp[1] = src->time_stamp[1]; 1487 1488 dst->beacon_interval = src->beacon_interval; 1489 dst->listen_interval = src->listen_interval; 1490 dst->atim_window = src->atim_window; 1491 dst->erp_value = src->erp_value; 1492 dst->tim = src->tim; 1493 1494 memcpy(dst->wpa_ie, src->wpa_ie, src->wpa_ie_len); 1495 dst->wpa_ie_len = src->wpa_ie_len; 1496 memcpy(dst->rsn_ie, src->rsn_ie, src->rsn_ie_len); 1497 dst->rsn_ie_len = src->rsn_ie_len; 1498 1499 dst->last_scanned = jiffies; 1500 qos_active = src->qos_data.active; 1501 old_param = dst->qos_data.old_param_count; 1502 if (dst->flags & NETWORK_HAS_QOS_MASK) 1503 memcpy(&dst->qos_data, &src->qos_data, 1504 sizeof(struct libipw_qos_data)); 1505 else { 1506 dst->qos_data.supported = src->qos_data.supported; 1507 dst->qos_data.param_count = src->qos_data.param_count; 1508 } 1509 1510 if (dst->qos_data.supported == 1) { 1511 if (dst->ssid_len) 1512 LIBIPW_DEBUG_QOS 1513 ("QoS the network %s is QoS supported\n", 1514 dst->ssid); 1515 else 1516 LIBIPW_DEBUG_QOS 1517 ("QoS the network is QoS supported\n"); 1518 } 1519 dst->qos_data.active = qos_active; 1520 dst->qos_data.old_param_count = old_param; 1521 1522 /* dst->last_associate is not overwritten */ 1523 } 1524 1525 static inline int is_beacon(__le16 fc) 1526 { 1527 return (WLAN_FC_GET_STYPE(le16_to_cpu(fc)) == IEEE80211_STYPE_BEACON); 1528 } 1529 1530 static void libipw_process_probe_response(struct libipw_device 1531 *ieee, struct 1532 libipw_probe_response 1533 *beacon, struct libipw_rx_stats 1534 *stats) 1535 { 1536 struct net_device *dev = ieee->dev; 1537 struct libipw_network network = { }; 1538 struct libipw_network *target; 1539 struct libipw_network *oldest = NULL; 1540 #ifdef CONFIG_LIBIPW_DEBUG 1541 struct libipw_info_element *info_element = beacon->info_element; 1542 #endif 1543 unsigned long flags; 1544 1545 LIBIPW_DEBUG_SCAN("'%*pE' (%pM): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n", 1546 info_element->len, info_element->data, 1547 beacon->header.addr3, 1548 (beacon->capability & cpu_to_le16(1 << 0xf)) ? '1' : '0', 1549 (beacon->capability & cpu_to_le16(1 << 0xe)) ? '1' : '0', 1550 (beacon->capability & cpu_to_le16(1 << 0xd)) ? '1' : '0', 1551 (beacon->capability & cpu_to_le16(1 << 0xc)) ? '1' : '0', 1552 (beacon->capability & cpu_to_le16(1 << 0xb)) ? '1' : '0', 1553 (beacon->capability & cpu_to_le16(1 << 0xa)) ? '1' : '0', 1554 (beacon->capability & cpu_to_le16(1 << 0x9)) ? '1' : '0', 1555 (beacon->capability & cpu_to_le16(1 << 0x8)) ? '1' : '0', 1556 (beacon->capability & cpu_to_le16(1 << 0x7)) ? '1' : '0', 1557 (beacon->capability & cpu_to_le16(1 << 0x6)) ? '1' : '0', 1558 (beacon->capability & cpu_to_le16(1 << 0x5)) ? '1' : '0', 1559 (beacon->capability & cpu_to_le16(1 << 0x4)) ? '1' : '0', 1560 (beacon->capability & cpu_to_le16(1 << 0x3)) ? '1' : '0', 1561 (beacon->capability & cpu_to_le16(1 << 0x2)) ? '1' : '0', 1562 (beacon->capability & cpu_to_le16(1 << 0x1)) ? '1' : '0', 1563 (beacon->capability & cpu_to_le16(1 << 0x0)) ? '1' : '0'); 1564 1565 if (libipw_network_init(ieee, beacon, &network, stats)) { 1566 LIBIPW_DEBUG_SCAN("Dropped '%*pE' (%pM) via %s.\n", 1567 info_element->len, info_element->data, 1568 beacon->header.addr3, 1569 is_beacon(beacon->header.frame_ctl) ? 1570 "BEACON" : "PROBE RESPONSE"); 1571 return; 1572 } 1573 1574 /* The network parsed correctly -- so now we scan our known networks 1575 * to see if we can find it in our list. 1576 * 1577 * NOTE: This search is definitely not optimized. Once its doing 1578 * the "right thing" we'll optimize it for efficiency if 1579 * necessary */ 1580 1581 /* Search for this entry in the list and update it if it is 1582 * already there. */ 1583 1584 spin_lock_irqsave(&ieee->lock, flags); 1585 1586 list_for_each_entry(target, &ieee->network_list, list) { 1587 if (is_same_network(target, &network)) 1588 break; 1589 1590 if ((oldest == NULL) || 1591 time_before(target->last_scanned, oldest->last_scanned)) 1592 oldest = target; 1593 } 1594 1595 /* If we didn't find a match, then get a new network slot to initialize 1596 * with this beacon's information */ 1597 if (&target->list == &ieee->network_list) { 1598 if (list_empty(&ieee->network_free_list)) { 1599 /* If there are no more slots, expire the oldest */ 1600 list_del(&oldest->list); 1601 target = oldest; 1602 LIBIPW_DEBUG_SCAN("Expired '%*pE' (%pM) from network list.\n", 1603 target->ssid_len, target->ssid, 1604 target->bssid); 1605 } else { 1606 /* Otherwise just pull from the free list */ 1607 target = list_entry(ieee->network_free_list.next, 1608 struct libipw_network, list); 1609 list_del(ieee->network_free_list.next); 1610 } 1611 1612 #ifdef CONFIG_LIBIPW_DEBUG 1613 LIBIPW_DEBUG_SCAN("Adding '%*pE' (%pM) via %s.\n", 1614 network.ssid_len, network.ssid, 1615 network.bssid, 1616 is_beacon(beacon->header.frame_ctl) ? 1617 "BEACON" : "PROBE RESPONSE"); 1618 #endif 1619 memcpy(target, &network, sizeof(*target)); 1620 list_add_tail(&target->list, &ieee->network_list); 1621 } else { 1622 LIBIPW_DEBUG_SCAN("Updating '%*pE' (%pM) via %s.\n", 1623 target->ssid_len, target->ssid, 1624 target->bssid, 1625 is_beacon(beacon->header.frame_ctl) ? 1626 "BEACON" : "PROBE RESPONSE"); 1627 update_network(target, &network); 1628 } 1629 1630 spin_unlock_irqrestore(&ieee->lock, flags); 1631 1632 if (is_beacon(beacon->header.frame_ctl)) { 1633 if (ieee->handle_beacon != NULL) 1634 ieee->handle_beacon(dev, beacon, target); 1635 } else { 1636 if (ieee->handle_probe_response != NULL) 1637 ieee->handle_probe_response(dev, beacon, target); 1638 } 1639 } 1640 1641 void libipw_rx_mgt(struct libipw_device *ieee, 1642 struct libipw_hdr_4addr *header, 1643 struct libipw_rx_stats *stats) 1644 { 1645 switch (WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl))) { 1646 case IEEE80211_STYPE_ASSOC_RESP: 1647 LIBIPW_DEBUG_MGMT("received ASSOCIATION RESPONSE (%d)\n", 1648 WLAN_FC_GET_STYPE(le16_to_cpu 1649 (header->frame_ctl))); 1650 libipw_handle_assoc_resp(ieee, 1651 (struct libipw_assoc_response *) 1652 header, stats); 1653 break; 1654 1655 case IEEE80211_STYPE_REASSOC_RESP: 1656 LIBIPW_DEBUG_MGMT("received REASSOCIATION RESPONSE (%d)\n", 1657 WLAN_FC_GET_STYPE(le16_to_cpu 1658 (header->frame_ctl))); 1659 break; 1660 1661 case IEEE80211_STYPE_PROBE_REQ: 1662 LIBIPW_DEBUG_MGMT("received auth (%d)\n", 1663 WLAN_FC_GET_STYPE(le16_to_cpu 1664 (header->frame_ctl))); 1665 1666 if (ieee->handle_probe_request != NULL) 1667 ieee->handle_probe_request(ieee->dev, 1668 (struct 1669 libipw_probe_request *) 1670 header, stats); 1671 break; 1672 1673 case IEEE80211_STYPE_PROBE_RESP: 1674 LIBIPW_DEBUG_MGMT("received PROBE RESPONSE (%d)\n", 1675 WLAN_FC_GET_STYPE(le16_to_cpu 1676 (header->frame_ctl))); 1677 LIBIPW_DEBUG_SCAN("Probe response\n"); 1678 libipw_process_probe_response(ieee, 1679 (struct 1680 libipw_probe_response *) 1681 header, stats); 1682 break; 1683 1684 case IEEE80211_STYPE_BEACON: 1685 LIBIPW_DEBUG_MGMT("received BEACON (%d)\n", 1686 WLAN_FC_GET_STYPE(le16_to_cpu 1687 (header->frame_ctl))); 1688 LIBIPW_DEBUG_SCAN("Beacon\n"); 1689 libipw_process_probe_response(ieee, 1690 (struct 1691 libipw_probe_response *) 1692 header, stats); 1693 break; 1694 case IEEE80211_STYPE_AUTH: 1695 1696 LIBIPW_DEBUG_MGMT("received auth (%d)\n", 1697 WLAN_FC_GET_STYPE(le16_to_cpu 1698 (header->frame_ctl))); 1699 1700 if (ieee->handle_auth != NULL) 1701 ieee->handle_auth(ieee->dev, 1702 (struct libipw_auth *)header); 1703 break; 1704 1705 case IEEE80211_STYPE_DISASSOC: 1706 if (ieee->handle_disassoc != NULL) 1707 ieee->handle_disassoc(ieee->dev, 1708 (struct libipw_disassoc *) 1709 header); 1710 break; 1711 1712 case IEEE80211_STYPE_ACTION: 1713 LIBIPW_DEBUG_MGMT("ACTION\n"); 1714 if (ieee->handle_action) 1715 ieee->handle_action(ieee->dev, 1716 (struct libipw_action *) 1717 header, stats); 1718 break; 1719 1720 case IEEE80211_STYPE_REASSOC_REQ: 1721 LIBIPW_DEBUG_MGMT("received reassoc (%d)\n", 1722 WLAN_FC_GET_STYPE(le16_to_cpu 1723 (header->frame_ctl))); 1724 1725 LIBIPW_DEBUG_MGMT("%s: LIBIPW_REASSOC_REQ received\n", 1726 ieee->dev->name); 1727 if (ieee->handle_reassoc_request != NULL) 1728 ieee->handle_reassoc_request(ieee->dev, 1729 (struct libipw_reassoc_request *) 1730 header); 1731 break; 1732 1733 case IEEE80211_STYPE_ASSOC_REQ: 1734 LIBIPW_DEBUG_MGMT("received assoc (%d)\n", 1735 WLAN_FC_GET_STYPE(le16_to_cpu 1736 (header->frame_ctl))); 1737 1738 LIBIPW_DEBUG_MGMT("%s: LIBIPW_ASSOC_REQ received\n", 1739 ieee->dev->name); 1740 if (ieee->handle_assoc_request != NULL) 1741 ieee->handle_assoc_request(ieee->dev); 1742 break; 1743 1744 case IEEE80211_STYPE_DEAUTH: 1745 LIBIPW_DEBUG_MGMT("DEAUTH\n"); 1746 if (ieee->handle_deauth != NULL) 1747 ieee->handle_deauth(ieee->dev, 1748 (struct libipw_deauth *) 1749 header); 1750 break; 1751 default: 1752 LIBIPW_DEBUG_MGMT("received UNKNOWN (%d)\n", 1753 WLAN_FC_GET_STYPE(le16_to_cpu 1754 (header->frame_ctl))); 1755 LIBIPW_DEBUG_MGMT("%s: Unknown management packet: %d\n", 1756 ieee->dev->name, 1757 WLAN_FC_GET_STYPE(le16_to_cpu 1758 (header->frame_ctl))); 1759 break; 1760 } 1761 } 1762 1763 EXPORT_SYMBOL_GPL(libipw_rx_any); 1764 EXPORT_SYMBOL(libipw_rx_mgt); 1765 EXPORT_SYMBOL(libipw_rx); 1766