1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Original code based Host AP (software wireless LAN access point) driver 4 * for Intersil Prism2/2.5/3 - hostap.o module, common routines 5 * 6 * Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen 7 * <j@w1.fi> 8 * Copyright (c) 2002-2003, Jouni Malinen <j@w1.fi> 9 * Copyright (c) 2004-2005, Intel Corporation 10 */ 11 12 #include <linux/compiler.h> 13 #include <linux/errno.h> 14 #include <linux/if_arp.h> 15 #include <linux/in6.h> 16 #include <linux/gfp.h> 17 #include <linux/in.h> 18 #include <linux/ip.h> 19 #include <linux/kernel.h> 20 #include <linux/module.h> 21 #include <linux/netdevice.h> 22 #include <linux/proc_fs.h> 23 #include <linux/skbuff.h> 24 #include <linux/tcp.h> 25 #include <linux/types.h> 26 #include <linux/wireless.h> 27 #include <linux/etherdevice.h> 28 #include <linux/uaccess.h> 29 #include <linux/ctype.h> 30 31 #include <net/lib80211.h> 32 33 #include "libipw.h" 34 35 static void libipw_monitor_rx(struct libipw_device *ieee, 36 struct sk_buff *skb, 37 struct libipw_rx_stats *rx_stats) 38 { 39 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 40 u16 fc = le16_to_cpu(hdr->frame_control); 41 42 skb->dev = ieee->dev; 43 skb_reset_mac_header(skb); 44 skb_pull(skb, libipw_get_hdrlen(fc)); 45 skb->pkt_type = PACKET_OTHERHOST; 46 skb->protocol = htons(ETH_P_80211_RAW); 47 memset(skb->cb, 0, sizeof(skb->cb)); 48 netif_rx(skb); 49 } 50 51 /* Called only as a tasklet (software IRQ) */ 52 static struct libipw_frag_entry *libipw_frag_cache_find(struct 53 libipw_device 54 *ieee, 55 unsigned int seq, 56 unsigned int frag, 57 u8 * src, 58 u8 * dst) 59 { 60 struct libipw_frag_entry *entry; 61 int i; 62 63 for (i = 0; i < LIBIPW_FRAG_CACHE_LEN; i++) { 64 entry = &ieee->frag_cache[i]; 65 if (entry->skb != NULL && 66 time_after(jiffies, entry->first_frag_time + 2 * HZ)) { 67 LIBIPW_DEBUG_FRAG("expiring fragment cache entry " 68 "seq=%u last_frag=%u\n", 69 entry->seq, entry->last_frag); 70 dev_kfree_skb_any(entry->skb); 71 entry->skb = NULL; 72 } 73 74 if (entry->skb != NULL && entry->seq == seq && 75 (entry->last_frag + 1 == frag || frag == -1) && 76 ether_addr_equal(entry->src_addr, src) && 77 ether_addr_equal(entry->dst_addr, dst)) 78 return entry; 79 } 80 81 return NULL; 82 } 83 84 /* Called only as a tasklet (software IRQ) */ 85 static struct sk_buff *libipw_frag_cache_get(struct libipw_device *ieee, 86 struct libipw_hdr_4addr *hdr) 87 { 88 struct sk_buff *skb = NULL; 89 u16 sc; 90 unsigned int frag, seq; 91 struct libipw_frag_entry *entry; 92 93 sc = le16_to_cpu(hdr->seq_ctl); 94 frag = WLAN_GET_SEQ_FRAG(sc); 95 seq = WLAN_GET_SEQ_SEQ(sc); 96 97 if (frag == 0) { 98 /* Reserve enough space to fit maximum frame length */ 99 skb = dev_alloc_skb(ieee->dev->mtu + 100 sizeof(struct libipw_hdr_4addr) + 101 8 /* LLC */ + 102 2 /* alignment */ + 103 8 /* WEP */ + ETH_ALEN /* WDS */ ); 104 if (skb == NULL) 105 return NULL; 106 107 entry = &ieee->frag_cache[ieee->frag_next_idx]; 108 ieee->frag_next_idx++; 109 if (ieee->frag_next_idx >= LIBIPW_FRAG_CACHE_LEN) 110 ieee->frag_next_idx = 0; 111 112 if (entry->skb != NULL) 113 dev_kfree_skb_any(entry->skb); 114 115 entry->first_frag_time = jiffies; 116 entry->seq = seq; 117 entry->last_frag = frag; 118 entry->skb = skb; 119 memcpy(entry->src_addr, hdr->addr2, ETH_ALEN); 120 memcpy(entry->dst_addr, hdr->addr1, ETH_ALEN); 121 } else { 122 /* received a fragment of a frame for which the head fragment 123 * should have already been received */ 124 entry = libipw_frag_cache_find(ieee, seq, frag, hdr->addr2, 125 hdr->addr1); 126 if (entry != NULL) { 127 entry->last_frag = frag; 128 skb = entry->skb; 129 } 130 } 131 132 return skb; 133 } 134 135 /* Called only as a tasklet (software IRQ) */ 136 static int libipw_frag_cache_invalidate(struct libipw_device *ieee, 137 struct libipw_hdr_4addr *hdr) 138 { 139 u16 sc; 140 unsigned int seq; 141 struct libipw_frag_entry *entry; 142 143 sc = le16_to_cpu(hdr->seq_ctl); 144 seq = WLAN_GET_SEQ_SEQ(sc); 145 146 entry = libipw_frag_cache_find(ieee, seq, -1, hdr->addr2, 147 hdr->addr1); 148 149 if (entry == NULL) { 150 LIBIPW_DEBUG_FRAG("could not invalidate fragment cache " 151 "entry (seq=%u)\n", seq); 152 return -1; 153 } 154 155 entry->skb = NULL; 156 return 0; 157 } 158 159 #ifdef NOT_YET 160 /* libipw_rx_frame_mgtmt 161 * 162 * Responsible for handling management control frames 163 * 164 * Called by libipw_rx */ 165 static int 166 libipw_rx_frame_mgmt(struct libipw_device *ieee, struct sk_buff *skb, 167 struct libipw_rx_stats *rx_stats, u16 type, 168 u16 stype) 169 { 170 if (ieee->iw_mode == IW_MODE_MASTER) { 171 printk(KERN_DEBUG "%s: Master mode not yet supported.\n", 172 ieee->dev->name); 173 return 0; 174 /* 175 hostap_update_sta_ps(ieee, (struct hostap_libipw_hdr_4addr *) 176 skb->data);*/ 177 } 178 179 if (ieee->hostapd && type == WLAN_FC_TYPE_MGMT) { 180 if (stype == WLAN_FC_STYPE_BEACON && 181 ieee->iw_mode == IW_MODE_MASTER) { 182 struct sk_buff *skb2; 183 /* Process beacon frames also in kernel driver to 184 * update STA(AP) table statistics */ 185 skb2 = skb_clone(skb, GFP_ATOMIC); 186 if (skb2) 187 hostap_rx(skb2->dev, skb2, rx_stats); 188 } 189 190 /* send management frames to the user space daemon for 191 * processing */ 192 ieee->apdevstats.rx_packets++; 193 ieee->apdevstats.rx_bytes += skb->len; 194 prism2_rx_80211(ieee->apdev, skb, rx_stats, PRISM2_RX_MGMT); 195 return 0; 196 } 197 198 if (ieee->iw_mode == IW_MODE_MASTER) { 199 if (type != WLAN_FC_TYPE_MGMT && type != WLAN_FC_TYPE_CTRL) { 200 printk(KERN_DEBUG "%s: unknown management frame " 201 "(type=0x%02x, stype=0x%02x) dropped\n", 202 skb->dev->name, type, stype); 203 return -1; 204 } 205 206 hostap_rx(skb->dev, skb, rx_stats); 207 return 0; 208 } 209 210 printk(KERN_DEBUG "%s: hostap_rx_frame_mgmt: management frame " 211 "received in non-Host AP mode\n", skb->dev->name); 212 return -1; 213 } 214 #endif 215 216 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */ 217 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */ 218 static unsigned char libipw_rfc1042_header[] = 219 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 }; 220 221 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */ 222 static unsigned char libipw_bridge_tunnel_header[] = 223 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 }; 224 /* No encapsulation header if EtherType < 0x600 (=length) */ 225 226 /* Called by libipw_rx_frame_decrypt */ 227 static int libipw_is_eapol_frame(struct libipw_device *ieee, 228 struct sk_buff *skb) 229 { 230 struct net_device *dev = ieee->dev; 231 u16 fc, ethertype; 232 struct libipw_hdr_3addr *hdr; 233 u8 *pos; 234 235 if (skb->len < 24) 236 return 0; 237 238 hdr = (struct libipw_hdr_3addr *)skb->data; 239 fc = le16_to_cpu(hdr->frame_ctl); 240 241 /* check that the frame is unicast frame to us */ 242 if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == 243 IEEE80211_FCTL_TODS && 244 ether_addr_equal(hdr->addr1, dev->dev_addr) && 245 ether_addr_equal(hdr->addr3, dev->dev_addr)) { 246 /* ToDS frame with own addr BSSID and DA */ 247 } else if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == 248 IEEE80211_FCTL_FROMDS && 249 ether_addr_equal(hdr->addr1, dev->dev_addr)) { 250 /* FromDS frame with own addr as DA */ 251 } else 252 return 0; 253 254 if (skb->len < 24 + 8) 255 return 0; 256 257 /* check for port access entity Ethernet type */ 258 pos = skb->data + 24; 259 ethertype = (pos[6] << 8) | pos[7]; 260 if (ethertype == ETH_P_PAE) 261 return 1; 262 263 return 0; 264 } 265 266 /* Called only as a tasklet (software IRQ), by libipw_rx */ 267 static int 268 libipw_rx_frame_decrypt(struct libipw_device *ieee, struct sk_buff *skb, 269 struct lib80211_crypt_data *crypt) 270 { 271 struct libipw_hdr_3addr *hdr; 272 int res, hdrlen; 273 274 if (crypt == NULL || crypt->ops->decrypt_mpdu == NULL) 275 return 0; 276 277 hdr = (struct libipw_hdr_3addr *)skb->data; 278 hdrlen = libipw_get_hdrlen(le16_to_cpu(hdr->frame_ctl)); 279 280 atomic_inc(&crypt->refcnt); 281 res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv); 282 atomic_dec(&crypt->refcnt); 283 if (res < 0) { 284 LIBIPW_DEBUG_DROP("decryption failed (SA=%pM) res=%d\n", 285 hdr->addr2, res); 286 if (res == -2) 287 LIBIPW_DEBUG_DROP("Decryption failed ICV " 288 "mismatch (key %d)\n", 289 skb->data[hdrlen + 3] >> 6); 290 ieee->ieee_stats.rx_discards_undecryptable++; 291 return -1; 292 } 293 294 return res; 295 } 296 297 /* Called only as a tasklet (software IRQ), by libipw_rx */ 298 static int 299 libipw_rx_frame_decrypt_msdu(struct libipw_device *ieee, 300 struct sk_buff *skb, int keyidx, 301 struct lib80211_crypt_data *crypt) 302 { 303 struct libipw_hdr_3addr *hdr; 304 int res, hdrlen; 305 306 if (crypt == NULL || crypt->ops->decrypt_msdu == NULL) 307 return 0; 308 309 hdr = (struct libipw_hdr_3addr *)skb->data; 310 hdrlen = libipw_get_hdrlen(le16_to_cpu(hdr->frame_ctl)); 311 312 atomic_inc(&crypt->refcnt); 313 res = crypt->ops->decrypt_msdu(skb, keyidx, hdrlen, crypt->priv); 314 atomic_dec(&crypt->refcnt); 315 if (res < 0) { 316 printk(KERN_DEBUG "%s: MSDU decryption/MIC verification failed" 317 " (SA=%pM keyidx=%d)\n", ieee->dev->name, hdr->addr2, 318 keyidx); 319 return -1; 320 } 321 322 return 0; 323 } 324 325 /* All received frames are sent to this function. @skb contains the frame in 326 * IEEE 802.11 format, i.e., in the format it was sent over air. 327 * This function is called only as a tasklet (software IRQ). */ 328 int libipw_rx(struct libipw_device *ieee, struct sk_buff *skb, 329 struct libipw_rx_stats *rx_stats) 330 { 331 struct net_device *dev = ieee->dev; 332 struct libipw_hdr_4addr *hdr; 333 size_t hdrlen; 334 u16 fc, type, stype, sc; 335 unsigned int frag; 336 u8 *payload; 337 u16 ethertype; 338 #ifdef NOT_YET 339 struct net_device *wds = NULL; 340 struct sk_buff *skb2 = NULL; 341 struct net_device *wds = NULL; 342 int frame_authorized = 0; 343 int from_assoc_ap = 0; 344 void *sta = NULL; 345 #endif 346 u8 dst[ETH_ALEN]; 347 u8 src[ETH_ALEN]; 348 struct lib80211_crypt_data *crypt = NULL; 349 int keyidx = 0; 350 int can_be_decrypted = 0; 351 352 hdr = (struct libipw_hdr_4addr *)skb->data; 353 if (skb->len < 10) { 354 printk(KERN_INFO "%s: SKB length < 10\n", dev->name); 355 goto rx_dropped; 356 } 357 358 fc = le16_to_cpu(hdr->frame_ctl); 359 type = WLAN_FC_GET_TYPE(fc); 360 stype = WLAN_FC_GET_STYPE(fc); 361 sc = le16_to_cpu(hdr->seq_ctl); 362 frag = WLAN_GET_SEQ_FRAG(sc); 363 hdrlen = libipw_get_hdrlen(fc); 364 365 if (skb->len < hdrlen) { 366 printk(KERN_INFO "%s: invalid SKB length %d\n", 367 dev->name, skb->len); 368 goto rx_dropped; 369 } 370 371 /* Put this code here so that we avoid duplicating it in all 372 * Rx paths. - Jean II */ 373 #ifdef CONFIG_WIRELESS_EXT 374 #ifdef IW_WIRELESS_SPY /* defined in iw_handler.h */ 375 /* If spy monitoring on */ 376 if (ieee->spy_data.spy_number > 0) { 377 struct iw_quality wstats; 378 379 wstats.updated = 0; 380 if (rx_stats->mask & LIBIPW_STATMASK_RSSI) { 381 wstats.level = rx_stats->signal; 382 wstats.updated |= IW_QUAL_LEVEL_UPDATED; 383 } else 384 wstats.updated |= IW_QUAL_LEVEL_INVALID; 385 386 if (rx_stats->mask & LIBIPW_STATMASK_NOISE) { 387 wstats.noise = rx_stats->noise; 388 wstats.updated |= IW_QUAL_NOISE_UPDATED; 389 } else 390 wstats.updated |= IW_QUAL_NOISE_INVALID; 391 392 if (rx_stats->mask & LIBIPW_STATMASK_SIGNAL) { 393 wstats.qual = rx_stats->signal; 394 wstats.updated |= IW_QUAL_QUAL_UPDATED; 395 } else 396 wstats.updated |= IW_QUAL_QUAL_INVALID; 397 398 /* Update spy records */ 399 wireless_spy_update(ieee->dev, hdr->addr2, &wstats); 400 } 401 #endif /* IW_WIRELESS_SPY */ 402 #endif /* CONFIG_WIRELESS_EXT */ 403 404 #ifdef NOT_YET 405 hostap_update_rx_stats(local->ap, hdr, rx_stats); 406 #endif 407 408 if (ieee->iw_mode == IW_MODE_MONITOR) { 409 dev->stats.rx_packets++; 410 dev->stats.rx_bytes += skb->len; 411 libipw_monitor_rx(ieee, skb, rx_stats); 412 return 1; 413 } 414 415 can_be_decrypted = (is_multicast_ether_addr(hdr->addr1) || 416 is_broadcast_ether_addr(hdr->addr2)) ? 417 ieee->host_mc_decrypt : ieee->host_decrypt; 418 419 if (can_be_decrypted) { 420 if (skb->len >= hdrlen + 3) { 421 /* Top two-bits of byte 3 are the key index */ 422 keyidx = skb->data[hdrlen + 3] >> 6; 423 } 424 425 /* ieee->crypt[] is WEP_KEY (4) in length. Given that keyidx 426 * is only allowed 2-bits of storage, no value of keyidx can 427 * be provided via above code that would result in keyidx 428 * being out of range */ 429 crypt = ieee->crypt_info.crypt[keyidx]; 430 431 #ifdef NOT_YET 432 sta = NULL; 433 434 /* Use station specific key to override default keys if the 435 * receiver address is a unicast address ("individual RA"). If 436 * bcrx_sta_key parameter is set, station specific key is used 437 * even with broad/multicast targets (this is against IEEE 438 * 802.11, but makes it easier to use different keys with 439 * stations that do not support WEP key mapping). */ 440 441 if (is_unicast_ether_addr(hdr->addr1) || local->bcrx_sta_key) 442 (void)hostap_handle_sta_crypto(local, hdr, &crypt, 443 &sta); 444 #endif 445 446 /* allow NULL decrypt to indicate an station specific override 447 * for default encryption */ 448 if (crypt && (crypt->ops == NULL || 449 crypt->ops->decrypt_mpdu == NULL)) 450 crypt = NULL; 451 452 if (!crypt && (fc & IEEE80211_FCTL_PROTECTED)) { 453 /* This seems to be triggered by some (multicast?) 454 * frames from other than current BSS, so just drop the 455 * frames silently instead of filling system log with 456 * these reports. */ 457 LIBIPW_DEBUG_DROP("Decryption failed (not set)" 458 " (SA=%pM)\n", hdr->addr2); 459 ieee->ieee_stats.rx_discards_undecryptable++; 460 goto rx_dropped; 461 } 462 } 463 #ifdef NOT_YET 464 if (type != WLAN_FC_TYPE_DATA) { 465 if (type == WLAN_FC_TYPE_MGMT && stype == WLAN_FC_STYPE_AUTH && 466 fc & IEEE80211_FCTL_PROTECTED && ieee->host_decrypt && 467 (keyidx = hostap_rx_frame_decrypt(ieee, skb, crypt)) < 0) { 468 printk(KERN_DEBUG "%s: failed to decrypt mgmt::auth " 469 "from %pM\n", dev->name, hdr->addr2); 470 /* TODO: could inform hostapd about this so that it 471 * could send auth failure report */ 472 goto rx_dropped; 473 } 474 475 if (libipw_rx_frame_mgmt(ieee, skb, rx_stats, type, stype)) 476 goto rx_dropped; 477 else 478 goto rx_exit; 479 } 480 #endif 481 /* drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.29) */ 482 if (sc == ieee->prev_seq_ctl) 483 goto rx_dropped; 484 else 485 ieee->prev_seq_ctl = sc; 486 487 /* Data frame - extract src/dst addresses */ 488 if (skb->len < LIBIPW_3ADDR_LEN) 489 goto rx_dropped; 490 491 switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) { 492 case IEEE80211_FCTL_FROMDS: 493 memcpy(dst, hdr->addr1, ETH_ALEN); 494 memcpy(src, hdr->addr3, ETH_ALEN); 495 break; 496 case IEEE80211_FCTL_TODS: 497 memcpy(dst, hdr->addr3, ETH_ALEN); 498 memcpy(src, hdr->addr2, ETH_ALEN); 499 break; 500 case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS: 501 if (skb->len < LIBIPW_4ADDR_LEN) 502 goto rx_dropped; 503 memcpy(dst, hdr->addr3, ETH_ALEN); 504 memcpy(src, hdr->addr4, ETH_ALEN); 505 break; 506 default: 507 memcpy(dst, hdr->addr1, ETH_ALEN); 508 memcpy(src, hdr->addr2, ETH_ALEN); 509 break; 510 } 511 512 #ifdef NOT_YET 513 if (hostap_rx_frame_wds(ieee, hdr, fc, &wds)) 514 goto rx_dropped; 515 if (wds) { 516 skb->dev = dev = wds; 517 stats = hostap_get_stats(dev); 518 } 519 520 if (ieee->iw_mode == IW_MODE_MASTER && !wds && 521 (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == 522 IEEE80211_FCTL_FROMDS && ieee->stadev && 523 ether_addr_equal(hdr->addr2, ieee->assoc_ap_addr)) { 524 /* Frame from BSSID of the AP for which we are a client */ 525 skb->dev = dev = ieee->stadev; 526 stats = hostap_get_stats(dev); 527 from_assoc_ap = 1; 528 } 529 #endif 530 531 #ifdef NOT_YET 532 if ((ieee->iw_mode == IW_MODE_MASTER || 533 ieee->iw_mode == IW_MODE_REPEAT) && !from_assoc_ap) { 534 switch (hostap_handle_sta_rx(ieee, dev, skb, rx_stats, 535 wds != NULL)) { 536 case AP_RX_CONTINUE_NOT_AUTHORIZED: 537 frame_authorized = 0; 538 break; 539 case AP_RX_CONTINUE: 540 frame_authorized = 1; 541 break; 542 case AP_RX_DROP: 543 goto rx_dropped; 544 case AP_RX_EXIT: 545 goto rx_exit; 546 } 547 } 548 #endif 549 550 /* Nullfunc frames may have PS-bit set, so they must be passed to 551 * hostap_handle_sta_rx() before being dropped here. */ 552 553 stype &= ~IEEE80211_STYPE_QOS_DATA; 554 555 if (stype != IEEE80211_STYPE_DATA && 556 stype != IEEE80211_STYPE_DATA_CFACK && 557 stype != IEEE80211_STYPE_DATA_CFPOLL && 558 stype != IEEE80211_STYPE_DATA_CFACKPOLL) { 559 if (stype != IEEE80211_STYPE_NULLFUNC) 560 LIBIPW_DEBUG_DROP("RX: dropped data frame " 561 "with no data (type=0x%02x, " 562 "subtype=0x%02x, len=%d)\n", 563 type, stype, skb->len); 564 goto rx_dropped; 565 } 566 567 /* skb: hdr + (possibly fragmented, possibly encrypted) payload */ 568 569 if ((fc & IEEE80211_FCTL_PROTECTED) && can_be_decrypted && 570 (keyidx = libipw_rx_frame_decrypt(ieee, skb, crypt)) < 0) 571 goto rx_dropped; 572 573 hdr = (struct libipw_hdr_4addr *)skb->data; 574 575 /* skb: hdr + (possibly fragmented) plaintext payload */ 576 // PR: FIXME: hostap has additional conditions in the "if" below: 577 // ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) && 578 if ((frag != 0) || (fc & IEEE80211_FCTL_MOREFRAGS)) { 579 int flen; 580 struct sk_buff *frag_skb = libipw_frag_cache_get(ieee, hdr); 581 LIBIPW_DEBUG_FRAG("Rx Fragment received (%u)\n", frag); 582 583 if (!frag_skb) { 584 LIBIPW_DEBUG(LIBIPW_DL_RX | LIBIPW_DL_FRAG, 585 "Rx cannot get skb from fragment " 586 "cache (morefrag=%d seq=%u frag=%u)\n", 587 (fc & IEEE80211_FCTL_MOREFRAGS) != 0, 588 WLAN_GET_SEQ_SEQ(sc), frag); 589 goto rx_dropped; 590 } 591 592 flen = skb->len; 593 if (frag != 0) 594 flen -= hdrlen; 595 596 if (frag_skb->tail + flen > frag_skb->end) { 597 printk(KERN_WARNING "%s: host decrypted and " 598 "reassembled frame did not fit skb\n", 599 dev->name); 600 libipw_frag_cache_invalidate(ieee, hdr); 601 goto rx_dropped; 602 } 603 604 if (frag == 0) { 605 /* copy first fragment (including full headers) into 606 * beginning of the fragment cache skb */ 607 skb_copy_from_linear_data(skb, skb_put(frag_skb, flen), flen); 608 } else { 609 /* append frame payload to the end of the fragment 610 * cache skb */ 611 skb_copy_from_linear_data_offset(skb, hdrlen, 612 skb_put(frag_skb, flen), flen); 613 } 614 dev_kfree_skb_any(skb); 615 skb = NULL; 616 617 if (fc & IEEE80211_FCTL_MOREFRAGS) { 618 /* more fragments expected - leave the skb in fragment 619 * cache for now; it will be delivered to upper layers 620 * after all fragments have been received */ 621 goto rx_exit; 622 } 623 624 /* this was the last fragment and the frame will be 625 * delivered, so remove skb from fragment cache */ 626 skb = frag_skb; 627 hdr = (struct libipw_hdr_4addr *)skb->data; 628 libipw_frag_cache_invalidate(ieee, hdr); 629 } 630 631 /* skb: hdr + (possible reassembled) full MSDU payload; possibly still 632 * encrypted/authenticated */ 633 if ((fc & IEEE80211_FCTL_PROTECTED) && can_be_decrypted && 634 libipw_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt)) 635 goto rx_dropped; 636 637 hdr = (struct libipw_hdr_4addr *)skb->data; 638 if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep) { 639 if ( /*ieee->ieee802_1x && */ 640 libipw_is_eapol_frame(ieee, skb)) { 641 /* pass unencrypted EAPOL frames even if encryption is 642 * configured */ 643 } else { 644 LIBIPW_DEBUG_DROP("encryption configured, but RX " 645 "frame not encrypted (SA=%pM)\n", 646 hdr->addr2); 647 goto rx_dropped; 648 } 649 } 650 651 if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep && 652 !libipw_is_eapol_frame(ieee, skb)) { 653 LIBIPW_DEBUG_DROP("dropped unencrypted RX data " 654 "frame from %pM (drop_unencrypted=1)\n", 655 hdr->addr2); 656 goto rx_dropped; 657 } 658 659 /* If the frame was decrypted in hardware, we may need to strip off 660 * any security data (IV, ICV, etc) that was left behind */ 661 if (!can_be_decrypted && (fc & IEEE80211_FCTL_PROTECTED) && 662 ieee->host_strip_iv_icv) { 663 int trimlen = 0; 664 665 /* Top two-bits of byte 3 are the key index */ 666 if (skb->len >= hdrlen + 3) 667 keyidx = skb->data[hdrlen + 3] >> 6; 668 669 /* To strip off any security data which appears before the 670 * payload, we simply increase hdrlen (as the header gets 671 * chopped off immediately below). For the security data which 672 * appears after the payload, we use skb_trim. */ 673 674 switch (ieee->sec.encode_alg[keyidx]) { 675 case SEC_ALG_WEP: 676 /* 4 byte IV */ 677 hdrlen += 4; 678 /* 4 byte ICV */ 679 trimlen = 4; 680 break; 681 case SEC_ALG_TKIP: 682 /* 4 byte IV, 4 byte ExtIV */ 683 hdrlen += 8; 684 /* 8 byte MIC, 4 byte ICV */ 685 trimlen = 12; 686 break; 687 case SEC_ALG_CCMP: 688 /* 8 byte CCMP header */ 689 hdrlen += 8; 690 /* 8 byte MIC */ 691 trimlen = 8; 692 break; 693 } 694 695 if (skb->len < trimlen) 696 goto rx_dropped; 697 698 __skb_trim(skb, skb->len - trimlen); 699 700 if (skb->len < hdrlen) 701 goto rx_dropped; 702 } 703 704 /* skb: hdr + (possible reassembled) full plaintext payload */ 705 706 payload = skb->data + hdrlen; 707 ethertype = (payload[6] << 8) | payload[7]; 708 709 #ifdef NOT_YET 710 /* If IEEE 802.1X is used, check whether the port is authorized to send 711 * the received frame. */ 712 if (ieee->ieee802_1x && ieee->iw_mode == IW_MODE_MASTER) { 713 if (ethertype == ETH_P_PAE) { 714 printk(KERN_DEBUG "%s: RX: IEEE 802.1X frame\n", 715 dev->name); 716 if (ieee->hostapd && ieee->apdev) { 717 /* Send IEEE 802.1X frames to the user 718 * space daemon for processing */ 719 prism2_rx_80211(ieee->apdev, skb, rx_stats, 720 PRISM2_RX_MGMT); 721 ieee->apdevstats.rx_packets++; 722 ieee->apdevstats.rx_bytes += skb->len; 723 goto rx_exit; 724 } 725 } else if (!frame_authorized) { 726 printk(KERN_DEBUG "%s: dropped frame from " 727 "unauthorized port (IEEE 802.1X): " 728 "ethertype=0x%04x\n", dev->name, ethertype); 729 goto rx_dropped; 730 } 731 } 732 #endif 733 734 /* convert hdr + possible LLC headers into Ethernet header */ 735 if (skb->len - hdrlen >= 8 && 736 ((memcmp(payload, libipw_rfc1042_header, SNAP_SIZE) == 0 && 737 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || 738 memcmp(payload, libipw_bridge_tunnel_header, SNAP_SIZE) == 0)) { 739 /* remove RFC1042 or Bridge-Tunnel encapsulation and 740 * replace EtherType */ 741 skb_pull(skb, hdrlen + SNAP_SIZE); 742 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); 743 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); 744 } else { 745 __be16 len; 746 /* Leave Ethernet header part of hdr and full payload */ 747 skb_pull(skb, hdrlen); 748 len = htons(skb->len); 749 memcpy(skb_push(skb, 2), &len, 2); 750 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); 751 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); 752 } 753 754 #ifdef NOT_YET 755 if (wds && ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == 756 IEEE80211_FCTL_TODS) && skb->len >= ETH_HLEN + ETH_ALEN) { 757 /* Non-standard frame: get addr4 from its bogus location after 758 * the payload */ 759 skb_copy_to_linear_data_offset(skb, ETH_ALEN, 760 skb->data + skb->len - ETH_ALEN, 761 ETH_ALEN); 762 skb_trim(skb, skb->len - ETH_ALEN); 763 } 764 #endif 765 766 dev->stats.rx_packets++; 767 dev->stats.rx_bytes += skb->len; 768 769 #ifdef NOT_YET 770 if (ieee->iw_mode == IW_MODE_MASTER && !wds && ieee->ap->bridge_packets) { 771 if (is_multicast_ether_addr(dst)) { 772 /* copy multicast frame both to the higher layers and 773 * to the wireless media */ 774 ieee->ap->bridged_multicast++; 775 skb2 = skb_clone(skb, GFP_ATOMIC); 776 if (skb2 == NULL) 777 printk(KERN_DEBUG "%s: skb_clone failed for " 778 "multicast frame\n", dev->name); 779 } else if (hostap_is_sta_assoc(ieee->ap, dst)) { 780 /* send frame directly to the associated STA using 781 * wireless media and not passing to higher layers */ 782 ieee->ap->bridged_unicast++; 783 skb2 = skb; 784 skb = NULL; 785 } 786 } 787 788 if (skb2 != NULL) { 789 /* send to wireless media */ 790 skb2->dev = dev; 791 skb2->protocol = htons(ETH_P_802_3); 792 skb_reset_mac_header(skb2); 793 skb_reset_network_header(skb2); 794 /* skb2->network_header += ETH_HLEN; */ 795 dev_queue_xmit(skb2); 796 } 797 #endif 798 799 if (skb) { 800 skb->protocol = eth_type_trans(skb, dev); 801 memset(skb->cb, 0, sizeof(skb->cb)); 802 skb->ip_summed = CHECKSUM_NONE; /* 802.11 crc not sufficient */ 803 if (netif_rx(skb) == NET_RX_DROP) { 804 /* netif_rx always succeeds, but it might drop 805 * the packet. If it drops the packet, we log that 806 * in our stats. */ 807 LIBIPW_DEBUG_DROP 808 ("RX: netif_rx dropped the packet\n"); 809 dev->stats.rx_dropped++; 810 } 811 } 812 813 rx_exit: 814 #ifdef NOT_YET 815 if (sta) 816 hostap_handle_sta_release(sta); 817 #endif 818 return 1; 819 820 rx_dropped: 821 dev->stats.rx_dropped++; 822 823 /* Returning 0 indicates to caller that we have not handled the SKB-- 824 * so it is still allocated and can be used again by underlying 825 * hardware as a DMA target */ 826 return 0; 827 } 828 829 /* Filter out unrelated packets, call libipw_rx[_mgt] 830 * This function takes over the skb, it should not be used again after calling 831 * this function. */ 832 void libipw_rx_any(struct libipw_device *ieee, 833 struct sk_buff *skb, struct libipw_rx_stats *stats) 834 { 835 struct libipw_hdr_4addr *hdr; 836 int is_packet_for_us; 837 u16 fc; 838 839 if (ieee->iw_mode == IW_MODE_MONITOR) { 840 if (!libipw_rx(ieee, skb, stats)) 841 dev_kfree_skb_irq(skb); 842 return; 843 } 844 845 if (skb->len < sizeof(struct ieee80211_hdr)) 846 goto drop_free; 847 848 hdr = (struct libipw_hdr_4addr *)skb->data; 849 fc = le16_to_cpu(hdr->frame_ctl); 850 851 if ((fc & IEEE80211_FCTL_VERS) != 0) 852 goto drop_free; 853 854 switch (fc & IEEE80211_FCTL_FTYPE) { 855 case IEEE80211_FTYPE_MGMT: 856 if (skb->len < sizeof(struct libipw_hdr_3addr)) 857 goto drop_free; 858 libipw_rx_mgt(ieee, hdr, stats); 859 dev_kfree_skb_irq(skb); 860 return; 861 case IEEE80211_FTYPE_DATA: 862 break; 863 case IEEE80211_FTYPE_CTL: 864 return; 865 default: 866 return; 867 } 868 869 is_packet_for_us = 0; 870 switch (ieee->iw_mode) { 871 case IW_MODE_ADHOC: 872 /* our BSS and not from/to DS */ 873 if (ether_addr_equal(hdr->addr3, ieee->bssid)) 874 if ((fc & (IEEE80211_FCTL_TODS+IEEE80211_FCTL_FROMDS)) == 0) { 875 /* promisc: get all */ 876 if (ieee->dev->flags & IFF_PROMISC) 877 is_packet_for_us = 1; 878 /* to us */ 879 else if (ether_addr_equal(hdr->addr1, ieee->dev->dev_addr)) 880 is_packet_for_us = 1; 881 /* mcast */ 882 else if (is_multicast_ether_addr(hdr->addr1)) 883 is_packet_for_us = 1; 884 } 885 break; 886 case IW_MODE_INFRA: 887 /* our BSS (== from our AP) and from DS */ 888 if (ether_addr_equal(hdr->addr2, ieee->bssid)) 889 if ((fc & (IEEE80211_FCTL_TODS+IEEE80211_FCTL_FROMDS)) == IEEE80211_FCTL_FROMDS) { 890 /* promisc: get all */ 891 if (ieee->dev->flags & IFF_PROMISC) 892 is_packet_for_us = 1; 893 /* to us */ 894 else if (ether_addr_equal(hdr->addr1, ieee->dev->dev_addr)) 895 is_packet_for_us = 1; 896 /* mcast */ 897 else if (is_multicast_ether_addr(hdr->addr1)) { 898 /* not our own packet bcasted from AP */ 899 if (!ether_addr_equal(hdr->addr3, ieee->dev->dev_addr)) 900 is_packet_for_us = 1; 901 } 902 } 903 break; 904 default: 905 /* ? */ 906 break; 907 } 908 909 if (is_packet_for_us) 910 if (!libipw_rx(ieee, skb, stats)) 911 dev_kfree_skb_irq(skb); 912 return; 913 914 drop_free: 915 dev_kfree_skb_irq(skb); 916 ieee->dev->stats.rx_dropped++; 917 } 918 919 #define MGMT_FRAME_FIXED_PART_LENGTH 0x24 920 921 static u8 qos_oui[QOS_OUI_LEN] = { 0x00, 0x50, 0xF2 }; 922 923 /* 924 * Make the structure we read from the beacon packet to have 925 * the right values 926 */ 927 static int libipw_verify_qos_info(struct libipw_qos_information_element 928 *info_element, int sub_type) 929 { 930 if (info_element->elementID != QOS_ELEMENT_ID) 931 return -1; 932 if (info_element->qui_subtype != sub_type) 933 return -1; 934 if (memcmp(info_element->qui, qos_oui, QOS_OUI_LEN)) 935 return -1; 936 if (info_element->qui_type != QOS_OUI_TYPE) 937 return -1; 938 if (info_element->version != QOS_VERSION_1) 939 return -1; 940 941 return 0; 942 } 943 944 /* 945 * Parse a QoS parameter element 946 */ 947 static int libipw_read_qos_param_element( 948 struct libipw_qos_parameter_info *element_param, 949 struct libipw_info_element *info_element) 950 { 951 size_t size = sizeof(*element_param); 952 953 if (!element_param || !info_element || info_element->len != size - 2) 954 return -1; 955 956 memcpy(element_param, info_element, size); 957 return libipw_verify_qos_info(&element_param->info_element, 958 QOS_OUI_PARAM_SUB_TYPE); 959 } 960 961 /* 962 * Parse a QoS information element 963 */ 964 static int libipw_read_qos_info_element( 965 struct libipw_qos_information_element *element_info, 966 struct libipw_info_element *info_element) 967 { 968 size_t size = sizeof(struct libipw_qos_information_element) - 2; 969 970 if (!element_info || !info_element || info_element->len != size - 2) 971 return -1; 972 973 memcpy(element_info, info_element, size); 974 return libipw_verify_qos_info(element_info, QOS_OUI_INFO_SUB_TYPE); 975 } 976 977 /* 978 * Write QoS parameters from the ac parameters. 979 */ 980 static void libipw_qos_convert_ac_to_parameters(struct 981 libipw_qos_parameter_info 982 *param_elm, struct 983 libipw_qos_parameters 984 *qos_param) 985 { 986 int i; 987 struct libipw_qos_ac_parameter *ac_params; 988 u32 txop; 989 u8 cw_min; 990 u8 cw_max; 991 992 for (i = 0; i < QOS_QUEUE_NUM; i++) { 993 ac_params = &(param_elm->ac_params_record[i]); 994 995 qos_param->aifs[i] = (ac_params->aci_aifsn) & 0x0F; 996 qos_param->aifs[i] -= (qos_param->aifs[i] < 2) ? 0 : 2; 997 998 cw_min = ac_params->ecw_min_max & 0x0F; 999 qos_param->cw_min[i] = cpu_to_le16((1 << cw_min) - 1); 1000 1001 cw_max = (ac_params->ecw_min_max & 0xF0) >> 4; 1002 qos_param->cw_max[i] = cpu_to_le16((1 << cw_max) - 1); 1003 1004 qos_param->flag[i] = 1005 (ac_params->aci_aifsn & 0x10) ? 0x01 : 0x00; 1006 1007 txop = le16_to_cpu(ac_params->tx_op_limit) * 32; 1008 qos_param->tx_op_limit[i] = cpu_to_le16(txop); 1009 } 1010 } 1011 1012 /* 1013 * we have a generic data element which it may contain QoS information or 1014 * parameters element. check the information element length to decide 1015 * which type to read 1016 */ 1017 static int libipw_parse_qos_info_param_IE(struct libipw_info_element 1018 *info_element, 1019 struct libipw_network *network) 1020 { 1021 int rc = 0; 1022 struct libipw_qos_parameters *qos_param = NULL; 1023 struct libipw_qos_information_element qos_info_element; 1024 1025 rc = libipw_read_qos_info_element(&qos_info_element, info_element); 1026 1027 if (rc == 0) { 1028 network->qos_data.param_count = qos_info_element.ac_info & 0x0F; 1029 network->flags |= NETWORK_HAS_QOS_INFORMATION; 1030 } else { 1031 struct libipw_qos_parameter_info param_element; 1032 1033 rc = libipw_read_qos_param_element(¶m_element, 1034 info_element); 1035 if (rc == 0) { 1036 qos_param = &(network->qos_data.parameters); 1037 libipw_qos_convert_ac_to_parameters(¶m_element, 1038 qos_param); 1039 network->flags |= NETWORK_HAS_QOS_PARAMETERS; 1040 network->qos_data.param_count = 1041 param_element.info_element.ac_info & 0x0F; 1042 } 1043 } 1044 1045 if (rc == 0) { 1046 LIBIPW_DEBUG_QOS("QoS is supported\n"); 1047 network->qos_data.supported = 1; 1048 } 1049 return rc; 1050 } 1051 1052 #ifdef CONFIG_LIBIPW_DEBUG 1053 #define MFIE_STRING(x) case WLAN_EID_ ##x: return #x 1054 1055 static const char *get_info_element_string(u16 id) 1056 { 1057 switch (id) { 1058 MFIE_STRING(SSID); 1059 MFIE_STRING(SUPP_RATES); 1060 MFIE_STRING(FH_PARAMS); 1061 MFIE_STRING(DS_PARAMS); 1062 MFIE_STRING(CF_PARAMS); 1063 MFIE_STRING(TIM); 1064 MFIE_STRING(IBSS_PARAMS); 1065 MFIE_STRING(COUNTRY); 1066 MFIE_STRING(REQUEST); 1067 MFIE_STRING(CHALLENGE); 1068 MFIE_STRING(PWR_CONSTRAINT); 1069 MFIE_STRING(PWR_CAPABILITY); 1070 MFIE_STRING(TPC_REQUEST); 1071 MFIE_STRING(TPC_REPORT); 1072 MFIE_STRING(SUPPORTED_CHANNELS); 1073 MFIE_STRING(CHANNEL_SWITCH); 1074 MFIE_STRING(MEASURE_REQUEST); 1075 MFIE_STRING(MEASURE_REPORT); 1076 MFIE_STRING(QUIET); 1077 MFIE_STRING(IBSS_DFS); 1078 MFIE_STRING(ERP_INFO); 1079 MFIE_STRING(RSN); 1080 MFIE_STRING(EXT_SUPP_RATES); 1081 MFIE_STRING(VENDOR_SPECIFIC); 1082 MFIE_STRING(QOS_PARAMETER); 1083 default: 1084 return "UNKNOWN"; 1085 } 1086 } 1087 #endif 1088 1089 static int libipw_parse_info_param(struct libipw_info_element 1090 *info_element, u16 length, 1091 struct libipw_network *network) 1092 { 1093 u8 i; 1094 #ifdef CONFIG_LIBIPW_DEBUG 1095 char rates_str[64]; 1096 char *p; 1097 #endif 1098 1099 while (length >= sizeof(*info_element)) { 1100 if (sizeof(*info_element) + info_element->len > length) { 1101 LIBIPW_DEBUG_MGMT("Info elem: parse failed: " 1102 "info_element->len + 2 > left : " 1103 "info_element->len+2=%zd left=%d, id=%d.\n", 1104 info_element->len + 1105 sizeof(*info_element), 1106 length, info_element->id); 1107 /* We stop processing but don't return an error here 1108 * because some misbehaviour APs break this rule. ie. 1109 * Orinoco AP1000. */ 1110 break; 1111 } 1112 1113 switch (info_element->id) { 1114 case WLAN_EID_SSID: 1115 network->ssid_len = min(info_element->len, 1116 (u8) IW_ESSID_MAX_SIZE); 1117 memcpy(network->ssid, info_element->data, 1118 network->ssid_len); 1119 if (network->ssid_len < IW_ESSID_MAX_SIZE) 1120 memset(network->ssid + network->ssid_len, 0, 1121 IW_ESSID_MAX_SIZE - network->ssid_len); 1122 1123 LIBIPW_DEBUG_MGMT("WLAN_EID_SSID: '%*pE' len=%d.\n", 1124 network->ssid_len, network->ssid, 1125 network->ssid_len); 1126 break; 1127 1128 case WLAN_EID_SUPP_RATES: 1129 #ifdef CONFIG_LIBIPW_DEBUG 1130 p = rates_str; 1131 #endif 1132 network->rates_len = min(info_element->len, 1133 MAX_RATES_LENGTH); 1134 for (i = 0; i < network->rates_len; i++) { 1135 network->rates[i] = info_element->data[i]; 1136 #ifdef CONFIG_LIBIPW_DEBUG 1137 p += scnprintf(p, sizeof(rates_str) - 1138 (p - rates_str), "%02X ", 1139 network->rates[i]); 1140 #endif 1141 if (libipw_is_ofdm_rate 1142 (info_element->data[i])) { 1143 network->flags |= NETWORK_HAS_OFDM; 1144 if (info_element->data[i] & 1145 LIBIPW_BASIC_RATE_MASK) 1146 network->flags &= 1147 ~NETWORK_HAS_CCK; 1148 } 1149 } 1150 1151 LIBIPW_DEBUG_MGMT("WLAN_EID_SUPP_RATES: '%s' (%d)\n", 1152 rates_str, network->rates_len); 1153 break; 1154 1155 case WLAN_EID_EXT_SUPP_RATES: 1156 #ifdef CONFIG_LIBIPW_DEBUG 1157 p = rates_str; 1158 #endif 1159 network->rates_ex_len = min(info_element->len, 1160 MAX_RATES_EX_LENGTH); 1161 for (i = 0; i < network->rates_ex_len; i++) { 1162 network->rates_ex[i] = info_element->data[i]; 1163 #ifdef CONFIG_LIBIPW_DEBUG 1164 p += scnprintf(p, sizeof(rates_str) - 1165 (p - rates_str), "%02X ", 1166 network->rates_ex[i]); 1167 #endif 1168 if (libipw_is_ofdm_rate 1169 (info_element->data[i])) { 1170 network->flags |= NETWORK_HAS_OFDM; 1171 if (info_element->data[i] & 1172 LIBIPW_BASIC_RATE_MASK) 1173 network->flags &= 1174 ~NETWORK_HAS_CCK; 1175 } 1176 } 1177 1178 LIBIPW_DEBUG_MGMT("WLAN_EID_EXT_SUPP_RATES: '%s' (%d)\n", 1179 rates_str, network->rates_ex_len); 1180 break; 1181 1182 case WLAN_EID_DS_PARAMS: 1183 LIBIPW_DEBUG_MGMT("WLAN_EID_DS_PARAMS: %d\n", 1184 info_element->data[0]); 1185 network->channel = info_element->data[0]; 1186 break; 1187 1188 case WLAN_EID_FH_PARAMS: 1189 LIBIPW_DEBUG_MGMT("WLAN_EID_FH_PARAMS: ignored\n"); 1190 break; 1191 1192 case WLAN_EID_CF_PARAMS: 1193 LIBIPW_DEBUG_MGMT("WLAN_EID_CF_PARAMS: ignored\n"); 1194 break; 1195 1196 case WLAN_EID_TIM: 1197 network->tim.tim_count = info_element->data[0]; 1198 network->tim.tim_period = info_element->data[1]; 1199 LIBIPW_DEBUG_MGMT("WLAN_EID_TIM: partially ignored\n"); 1200 break; 1201 1202 case WLAN_EID_ERP_INFO: 1203 network->erp_value = info_element->data[0]; 1204 network->flags |= NETWORK_HAS_ERP_VALUE; 1205 LIBIPW_DEBUG_MGMT("MFIE_TYPE_ERP_SET: %d\n", 1206 network->erp_value); 1207 break; 1208 1209 case WLAN_EID_IBSS_PARAMS: 1210 network->atim_window = info_element->data[0]; 1211 LIBIPW_DEBUG_MGMT("WLAN_EID_IBSS_PARAMS: %d\n", 1212 network->atim_window); 1213 break; 1214 1215 case WLAN_EID_CHALLENGE: 1216 LIBIPW_DEBUG_MGMT("WLAN_EID_CHALLENGE: ignored\n"); 1217 break; 1218 1219 case WLAN_EID_VENDOR_SPECIFIC: 1220 LIBIPW_DEBUG_MGMT("WLAN_EID_VENDOR_SPECIFIC: %d bytes\n", 1221 info_element->len); 1222 if (!libipw_parse_qos_info_param_IE(info_element, 1223 network)) 1224 break; 1225 1226 if (info_element->len >= 4 && 1227 info_element->data[0] == 0x00 && 1228 info_element->data[1] == 0x50 && 1229 info_element->data[2] == 0xf2 && 1230 info_element->data[3] == 0x01) { 1231 network->wpa_ie_len = min(info_element->len + 2, 1232 MAX_WPA_IE_LEN); 1233 memcpy(network->wpa_ie, info_element, 1234 network->wpa_ie_len); 1235 } 1236 break; 1237 1238 case WLAN_EID_RSN: 1239 LIBIPW_DEBUG_MGMT("WLAN_EID_RSN: %d bytes\n", 1240 info_element->len); 1241 network->rsn_ie_len = min(info_element->len + 2, 1242 MAX_WPA_IE_LEN); 1243 memcpy(network->rsn_ie, info_element, 1244 network->rsn_ie_len); 1245 break; 1246 1247 case WLAN_EID_QOS_PARAMETER: 1248 printk(KERN_ERR 1249 "QoS Error need to parse QOS_PARAMETER IE\n"); 1250 break; 1251 /* 802.11h */ 1252 case WLAN_EID_PWR_CONSTRAINT: 1253 network->power_constraint = info_element->data[0]; 1254 network->flags |= NETWORK_HAS_POWER_CONSTRAINT; 1255 break; 1256 1257 case WLAN_EID_CHANNEL_SWITCH: 1258 network->power_constraint = info_element->data[0]; 1259 network->flags |= NETWORK_HAS_CSA; 1260 break; 1261 1262 case WLAN_EID_QUIET: 1263 network->quiet.count = info_element->data[0]; 1264 network->quiet.period = info_element->data[1]; 1265 network->quiet.duration = info_element->data[2]; 1266 network->quiet.offset = info_element->data[3]; 1267 network->flags |= NETWORK_HAS_QUIET; 1268 break; 1269 1270 case WLAN_EID_IBSS_DFS: 1271 network->flags |= NETWORK_HAS_IBSS_DFS; 1272 break; 1273 1274 case WLAN_EID_TPC_REPORT: 1275 network->tpc_report.transmit_power = 1276 info_element->data[0]; 1277 network->tpc_report.link_margin = info_element->data[1]; 1278 network->flags |= NETWORK_HAS_TPC_REPORT; 1279 break; 1280 1281 default: 1282 LIBIPW_DEBUG_MGMT 1283 ("Unsupported info element: %s (%d)\n", 1284 get_info_element_string(info_element->id), 1285 info_element->id); 1286 break; 1287 } 1288 1289 length -= sizeof(*info_element) + info_element->len; 1290 info_element = 1291 (struct libipw_info_element *)&info_element-> 1292 data[info_element->len]; 1293 } 1294 1295 return 0; 1296 } 1297 1298 static int libipw_handle_assoc_resp(struct libipw_device *ieee, struct libipw_assoc_response 1299 *frame, struct libipw_rx_stats *stats) 1300 { 1301 struct libipw_network network_resp = { }; 1302 struct libipw_network *network = &network_resp; 1303 struct net_device *dev = ieee->dev; 1304 1305 network->flags = 0; 1306 network->qos_data.active = 0; 1307 network->qos_data.supported = 0; 1308 network->qos_data.param_count = 0; 1309 network->qos_data.old_param_count = 0; 1310 1311 //network->atim_window = le16_to_cpu(frame->aid) & (0x3FFF); 1312 network->atim_window = le16_to_cpu(frame->aid); 1313 network->listen_interval = le16_to_cpu(frame->status); 1314 memcpy(network->bssid, frame->header.addr3, ETH_ALEN); 1315 network->capability = le16_to_cpu(frame->capability); 1316 network->last_scanned = jiffies; 1317 network->rates_len = network->rates_ex_len = 0; 1318 network->last_associate = 0; 1319 network->ssid_len = 0; 1320 network->erp_value = 1321 (network->capability & WLAN_CAPABILITY_IBSS) ? 0x3 : 0x0; 1322 1323 if (stats->freq == LIBIPW_52GHZ_BAND) { 1324 /* for A band (No DS info) */ 1325 network->channel = stats->received_channel; 1326 } else 1327 network->flags |= NETWORK_HAS_CCK; 1328 1329 network->wpa_ie_len = 0; 1330 network->rsn_ie_len = 0; 1331 1332 if (libipw_parse_info_param((void *)frame->variable, 1333 stats->len - sizeof(*frame), network)) 1334 return 1; 1335 1336 network->mode = 0; 1337 if (stats->freq == LIBIPW_52GHZ_BAND) 1338 network->mode = IEEE_A; 1339 else { 1340 if (network->flags & NETWORK_HAS_OFDM) 1341 network->mode |= IEEE_G; 1342 if (network->flags & NETWORK_HAS_CCK) 1343 network->mode |= IEEE_B; 1344 } 1345 1346 memcpy(&network->stats, stats, sizeof(network->stats)); 1347 1348 if (ieee->handle_assoc_response != NULL) 1349 ieee->handle_assoc_response(dev, frame, network); 1350 1351 return 0; 1352 } 1353 1354 /***************************************************/ 1355 1356 static int libipw_network_init(struct libipw_device *ieee, struct libipw_probe_response 1357 *beacon, 1358 struct libipw_network *network, 1359 struct libipw_rx_stats *stats) 1360 { 1361 network->qos_data.active = 0; 1362 network->qos_data.supported = 0; 1363 network->qos_data.param_count = 0; 1364 network->qos_data.old_param_count = 0; 1365 1366 /* Pull out fixed field data */ 1367 memcpy(network->bssid, beacon->header.addr3, ETH_ALEN); 1368 network->capability = le16_to_cpu(beacon->capability); 1369 network->last_scanned = jiffies; 1370 network->time_stamp[0] = le32_to_cpu(beacon->time_stamp[0]); 1371 network->time_stamp[1] = le32_to_cpu(beacon->time_stamp[1]); 1372 network->beacon_interval = le16_to_cpu(beacon->beacon_interval); 1373 /* Where to pull this? beacon->listen_interval; */ 1374 network->listen_interval = 0x0A; 1375 network->rates_len = network->rates_ex_len = 0; 1376 network->last_associate = 0; 1377 network->ssid_len = 0; 1378 network->flags = 0; 1379 network->atim_window = 0; 1380 network->erp_value = (network->capability & WLAN_CAPABILITY_IBSS) ? 1381 0x3 : 0x0; 1382 1383 if (stats->freq == LIBIPW_52GHZ_BAND) { 1384 /* for A band (No DS info) */ 1385 network->channel = stats->received_channel; 1386 } else 1387 network->flags |= NETWORK_HAS_CCK; 1388 1389 network->wpa_ie_len = 0; 1390 network->rsn_ie_len = 0; 1391 1392 if (libipw_parse_info_param((void *)beacon->variable, 1393 stats->len - sizeof(*beacon), network)) 1394 return 1; 1395 1396 network->mode = 0; 1397 if (stats->freq == LIBIPW_52GHZ_BAND) 1398 network->mode = IEEE_A; 1399 else { 1400 if (network->flags & NETWORK_HAS_OFDM) 1401 network->mode |= IEEE_G; 1402 if (network->flags & NETWORK_HAS_CCK) 1403 network->mode |= IEEE_B; 1404 } 1405 1406 if (network->mode == 0) { 1407 LIBIPW_DEBUG_SCAN("Filtered out '%*pE (%pM)' network.\n", 1408 network->ssid_len, network->ssid, 1409 network->bssid); 1410 return 1; 1411 } 1412 1413 memcpy(&network->stats, stats, sizeof(network->stats)); 1414 1415 return 0; 1416 } 1417 1418 static inline int is_same_network(struct libipw_network *src, 1419 struct libipw_network *dst) 1420 { 1421 /* A network is only a duplicate if the channel, BSSID, and ESSID 1422 * all match. We treat all <hidden> with the same BSSID and channel 1423 * as one network */ 1424 return ((src->ssid_len == dst->ssid_len) && 1425 (src->channel == dst->channel) && 1426 ether_addr_equal_64bits(src->bssid, dst->bssid) && 1427 !memcmp(src->ssid, dst->ssid, src->ssid_len)); 1428 } 1429 1430 static void update_network(struct libipw_network *dst, 1431 struct libipw_network *src) 1432 { 1433 int qos_active; 1434 u8 old_param; 1435 1436 /* We only update the statistics if they were created by receiving 1437 * the network information on the actual channel the network is on. 1438 * 1439 * This keeps beacons received on neighbor channels from bringing 1440 * down the signal level of an AP. */ 1441 if (dst->channel == src->stats.received_channel) 1442 memcpy(&dst->stats, &src->stats, 1443 sizeof(struct libipw_rx_stats)); 1444 else 1445 LIBIPW_DEBUG_SCAN("Network %pM info received " 1446 "off channel (%d vs. %d)\n", src->bssid, 1447 dst->channel, src->stats.received_channel); 1448 1449 dst->capability = src->capability; 1450 memcpy(dst->rates, src->rates, src->rates_len); 1451 dst->rates_len = src->rates_len; 1452 memcpy(dst->rates_ex, src->rates_ex, src->rates_ex_len); 1453 dst->rates_ex_len = src->rates_ex_len; 1454 1455 dst->mode = src->mode; 1456 dst->flags = src->flags; 1457 dst->time_stamp[0] = src->time_stamp[0]; 1458 dst->time_stamp[1] = src->time_stamp[1]; 1459 1460 dst->beacon_interval = src->beacon_interval; 1461 dst->listen_interval = src->listen_interval; 1462 dst->atim_window = src->atim_window; 1463 dst->erp_value = src->erp_value; 1464 dst->tim = src->tim; 1465 1466 memcpy(dst->wpa_ie, src->wpa_ie, src->wpa_ie_len); 1467 dst->wpa_ie_len = src->wpa_ie_len; 1468 memcpy(dst->rsn_ie, src->rsn_ie, src->rsn_ie_len); 1469 dst->rsn_ie_len = src->rsn_ie_len; 1470 1471 dst->last_scanned = jiffies; 1472 qos_active = src->qos_data.active; 1473 old_param = dst->qos_data.old_param_count; 1474 if (dst->flags & NETWORK_HAS_QOS_MASK) 1475 memcpy(&dst->qos_data, &src->qos_data, 1476 sizeof(struct libipw_qos_data)); 1477 else { 1478 dst->qos_data.supported = src->qos_data.supported; 1479 dst->qos_data.param_count = src->qos_data.param_count; 1480 } 1481 1482 if (dst->qos_data.supported == 1) { 1483 if (dst->ssid_len) 1484 LIBIPW_DEBUG_QOS 1485 ("QoS the network %s is QoS supported\n", 1486 dst->ssid); 1487 else 1488 LIBIPW_DEBUG_QOS 1489 ("QoS the network is QoS supported\n"); 1490 } 1491 dst->qos_data.active = qos_active; 1492 dst->qos_data.old_param_count = old_param; 1493 1494 /* dst->last_associate is not overwritten */ 1495 } 1496 1497 static inline int is_beacon(__le16 fc) 1498 { 1499 return (WLAN_FC_GET_STYPE(le16_to_cpu(fc)) == IEEE80211_STYPE_BEACON); 1500 } 1501 1502 static void libipw_process_probe_response(struct libipw_device 1503 *ieee, struct 1504 libipw_probe_response 1505 *beacon, struct libipw_rx_stats 1506 *stats) 1507 { 1508 struct net_device *dev = ieee->dev; 1509 struct libipw_network network = { }; 1510 struct libipw_network *target; 1511 struct libipw_network *oldest = NULL; 1512 #ifdef CONFIG_LIBIPW_DEBUG 1513 struct libipw_info_element *info_element = (void *)beacon->variable; 1514 #endif 1515 unsigned long flags; 1516 1517 LIBIPW_DEBUG_SCAN("'%*pE' (%pM): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n", 1518 info_element->len, info_element->data, 1519 beacon->header.addr3, 1520 (beacon->capability & cpu_to_le16(1 << 0xf)) ? '1' : '0', 1521 (beacon->capability & cpu_to_le16(1 << 0xe)) ? '1' : '0', 1522 (beacon->capability & cpu_to_le16(1 << 0xd)) ? '1' : '0', 1523 (beacon->capability & cpu_to_le16(1 << 0xc)) ? '1' : '0', 1524 (beacon->capability & cpu_to_le16(1 << 0xb)) ? '1' : '0', 1525 (beacon->capability & cpu_to_le16(1 << 0xa)) ? '1' : '0', 1526 (beacon->capability & cpu_to_le16(1 << 0x9)) ? '1' : '0', 1527 (beacon->capability & cpu_to_le16(1 << 0x8)) ? '1' : '0', 1528 (beacon->capability & cpu_to_le16(1 << 0x7)) ? '1' : '0', 1529 (beacon->capability & cpu_to_le16(1 << 0x6)) ? '1' : '0', 1530 (beacon->capability & cpu_to_le16(1 << 0x5)) ? '1' : '0', 1531 (beacon->capability & cpu_to_le16(1 << 0x4)) ? '1' : '0', 1532 (beacon->capability & cpu_to_le16(1 << 0x3)) ? '1' : '0', 1533 (beacon->capability & cpu_to_le16(1 << 0x2)) ? '1' : '0', 1534 (beacon->capability & cpu_to_le16(1 << 0x1)) ? '1' : '0', 1535 (beacon->capability & cpu_to_le16(1 << 0x0)) ? '1' : '0'); 1536 1537 if (libipw_network_init(ieee, beacon, &network, stats)) { 1538 LIBIPW_DEBUG_SCAN("Dropped '%*pE' (%pM) via %s.\n", 1539 info_element->len, info_element->data, 1540 beacon->header.addr3, 1541 is_beacon(beacon->header.frame_ctl) ? 1542 "BEACON" : "PROBE RESPONSE"); 1543 return; 1544 } 1545 1546 /* The network parsed correctly -- so now we scan our known networks 1547 * to see if we can find it in our list. 1548 * 1549 * NOTE: This search is definitely not optimized. Once its doing 1550 * the "right thing" we'll optimize it for efficiency if 1551 * necessary */ 1552 1553 /* Search for this entry in the list and update it if it is 1554 * already there. */ 1555 1556 spin_lock_irqsave(&ieee->lock, flags); 1557 1558 list_for_each_entry(target, &ieee->network_list, list) { 1559 if (is_same_network(target, &network)) 1560 break; 1561 1562 if ((oldest == NULL) || 1563 time_before(target->last_scanned, oldest->last_scanned)) 1564 oldest = target; 1565 } 1566 1567 /* If we didn't find a match, then get a new network slot to initialize 1568 * with this beacon's information */ 1569 if (&target->list == &ieee->network_list) { 1570 if (list_empty(&ieee->network_free_list)) { 1571 /* If there are no more slots, expire the oldest */ 1572 list_del(&oldest->list); 1573 target = oldest; 1574 LIBIPW_DEBUG_SCAN("Expired '%*pE' (%pM) from network list.\n", 1575 target->ssid_len, target->ssid, 1576 target->bssid); 1577 } else { 1578 /* Otherwise just pull from the free list */ 1579 target = list_entry(ieee->network_free_list.next, 1580 struct libipw_network, list); 1581 list_del(ieee->network_free_list.next); 1582 } 1583 1584 #ifdef CONFIG_LIBIPW_DEBUG 1585 LIBIPW_DEBUG_SCAN("Adding '%*pE' (%pM) via %s.\n", 1586 network.ssid_len, network.ssid, 1587 network.bssid, 1588 is_beacon(beacon->header.frame_ctl) ? 1589 "BEACON" : "PROBE RESPONSE"); 1590 #endif 1591 memcpy(target, &network, sizeof(*target)); 1592 list_add_tail(&target->list, &ieee->network_list); 1593 } else { 1594 LIBIPW_DEBUG_SCAN("Updating '%*pE' (%pM) via %s.\n", 1595 target->ssid_len, target->ssid, 1596 target->bssid, 1597 is_beacon(beacon->header.frame_ctl) ? 1598 "BEACON" : "PROBE RESPONSE"); 1599 update_network(target, &network); 1600 } 1601 1602 spin_unlock_irqrestore(&ieee->lock, flags); 1603 1604 if (is_beacon(beacon->header.frame_ctl)) { 1605 if (ieee->handle_beacon != NULL) 1606 ieee->handle_beacon(dev, beacon, target); 1607 } else { 1608 if (ieee->handle_probe_response != NULL) 1609 ieee->handle_probe_response(dev, beacon, target); 1610 } 1611 } 1612 1613 void libipw_rx_mgt(struct libipw_device *ieee, 1614 struct libipw_hdr_4addr *header, 1615 struct libipw_rx_stats *stats) 1616 { 1617 switch (WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl))) { 1618 case IEEE80211_STYPE_ASSOC_RESP: 1619 LIBIPW_DEBUG_MGMT("received ASSOCIATION RESPONSE (%d)\n", 1620 WLAN_FC_GET_STYPE(le16_to_cpu 1621 (header->frame_ctl))); 1622 libipw_handle_assoc_resp(ieee, 1623 (struct libipw_assoc_response *) 1624 header, stats); 1625 break; 1626 1627 case IEEE80211_STYPE_REASSOC_RESP: 1628 LIBIPW_DEBUG_MGMT("received REASSOCIATION RESPONSE (%d)\n", 1629 WLAN_FC_GET_STYPE(le16_to_cpu 1630 (header->frame_ctl))); 1631 break; 1632 1633 case IEEE80211_STYPE_PROBE_REQ: 1634 LIBIPW_DEBUG_MGMT("received auth (%d)\n", 1635 WLAN_FC_GET_STYPE(le16_to_cpu 1636 (header->frame_ctl))); 1637 1638 if (ieee->handle_probe_request != NULL) 1639 ieee->handle_probe_request(ieee->dev, 1640 (struct 1641 libipw_probe_request *) 1642 header, stats); 1643 break; 1644 1645 case IEEE80211_STYPE_PROBE_RESP: 1646 LIBIPW_DEBUG_MGMT("received PROBE RESPONSE (%d)\n", 1647 WLAN_FC_GET_STYPE(le16_to_cpu 1648 (header->frame_ctl))); 1649 LIBIPW_DEBUG_SCAN("Probe response\n"); 1650 libipw_process_probe_response(ieee, 1651 (struct 1652 libipw_probe_response *) 1653 header, stats); 1654 break; 1655 1656 case IEEE80211_STYPE_BEACON: 1657 LIBIPW_DEBUG_MGMT("received BEACON (%d)\n", 1658 WLAN_FC_GET_STYPE(le16_to_cpu 1659 (header->frame_ctl))); 1660 LIBIPW_DEBUG_SCAN("Beacon\n"); 1661 libipw_process_probe_response(ieee, 1662 (struct 1663 libipw_probe_response *) 1664 header, stats); 1665 break; 1666 case IEEE80211_STYPE_AUTH: 1667 1668 LIBIPW_DEBUG_MGMT("received auth (%d)\n", 1669 WLAN_FC_GET_STYPE(le16_to_cpu 1670 (header->frame_ctl))); 1671 1672 if (ieee->handle_auth != NULL) 1673 ieee->handle_auth(ieee->dev, 1674 (struct libipw_auth *)header); 1675 break; 1676 1677 case IEEE80211_STYPE_DISASSOC: 1678 if (ieee->handle_disassoc != NULL) 1679 ieee->handle_disassoc(ieee->dev, 1680 (struct libipw_disassoc *) 1681 header); 1682 break; 1683 1684 case IEEE80211_STYPE_ACTION: 1685 LIBIPW_DEBUG_MGMT("ACTION\n"); 1686 if (ieee->handle_action) 1687 ieee->handle_action(ieee->dev, 1688 (struct libipw_action *) 1689 header, stats); 1690 break; 1691 1692 case IEEE80211_STYPE_REASSOC_REQ: 1693 LIBIPW_DEBUG_MGMT("received reassoc (%d)\n", 1694 WLAN_FC_GET_STYPE(le16_to_cpu 1695 (header->frame_ctl))); 1696 1697 LIBIPW_DEBUG_MGMT("%s: LIBIPW_REASSOC_REQ received\n", 1698 ieee->dev->name); 1699 if (ieee->handle_reassoc_request != NULL) 1700 ieee->handle_reassoc_request(ieee->dev, 1701 (struct libipw_reassoc_request *) 1702 header); 1703 break; 1704 1705 case IEEE80211_STYPE_ASSOC_REQ: 1706 LIBIPW_DEBUG_MGMT("received assoc (%d)\n", 1707 WLAN_FC_GET_STYPE(le16_to_cpu 1708 (header->frame_ctl))); 1709 1710 LIBIPW_DEBUG_MGMT("%s: LIBIPW_ASSOC_REQ received\n", 1711 ieee->dev->name); 1712 if (ieee->handle_assoc_request != NULL) 1713 ieee->handle_assoc_request(ieee->dev); 1714 break; 1715 1716 case IEEE80211_STYPE_DEAUTH: 1717 LIBIPW_DEBUG_MGMT("DEAUTH\n"); 1718 if (ieee->handle_deauth != NULL) 1719 ieee->handle_deauth(ieee->dev, 1720 (struct libipw_deauth *) 1721 header); 1722 break; 1723 default: 1724 LIBIPW_DEBUG_MGMT("received UNKNOWN (%d)\n", 1725 WLAN_FC_GET_STYPE(le16_to_cpu 1726 (header->frame_ctl))); 1727 LIBIPW_DEBUG_MGMT("%s: Unknown management packet: %d\n", 1728 ieee->dev->name, 1729 WLAN_FC_GET_STYPE(le16_to_cpu 1730 (header->frame_ctl))); 1731 break; 1732 } 1733 } 1734 1735 EXPORT_SYMBOL_GPL(libipw_rx_any); 1736 EXPORT_SYMBOL(libipw_rx_mgt); 1737 EXPORT_SYMBOL(libipw_rx); 1738