1 /* 2 * Copyright 2002-2005, Instant802 Networks, Inc. 3 * Copyright 2005-2006, Devicescape Software, Inc. 4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 5 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11 12 #include <linux/jiffies.h> 13 #include <linux/slab.h> 14 #include <linux/kernel.h> 15 #include <linux/skbuff.h> 16 #include <linux/netdevice.h> 17 #include <linux/etherdevice.h> 18 #include <linux/rcupdate.h> 19 #include <net/mac80211.h> 20 #include <net/ieee80211_radiotap.h> 21 22 #include "ieee80211_i.h" 23 #include "driver-ops.h" 24 #include "led.h" 25 #include "mesh.h" 26 #include "wep.h" 27 #include "wpa.h" 28 #include "tkip.h" 29 #include "wme.h" 30 31 /* 32 * monitor mode reception 33 * 34 * This function cleans up the SKB, i.e. it removes all the stuff 35 * only useful for monitoring. 36 */ 37 static struct sk_buff *remove_monitor_info(struct ieee80211_local *local, 38 struct sk_buff *skb) 39 { 40 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) { 41 if (likely(skb->len > FCS_LEN)) 42 __pskb_trim(skb, skb->len - FCS_LEN); 43 else { 44 /* driver bug */ 45 WARN_ON(1); 46 dev_kfree_skb(skb); 47 skb = NULL; 48 } 49 } 50 51 return skb; 52 } 53 54 static inline int should_drop_frame(struct sk_buff *skb, 55 int present_fcs_len) 56 { 57 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 58 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 59 60 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) 61 return 1; 62 if (unlikely(skb->len < 16 + present_fcs_len)) 63 return 1; 64 if (ieee80211_is_ctl(hdr->frame_control) && 65 !ieee80211_is_pspoll(hdr->frame_control) && 66 !ieee80211_is_back_req(hdr->frame_control)) 67 return 1; 68 return 0; 69 } 70 71 static int 72 ieee80211_rx_radiotap_len(struct ieee80211_local *local, 73 struct ieee80211_rx_status *status) 74 { 75 int len; 76 77 /* always present fields */ 78 len = sizeof(struct ieee80211_radiotap_header) + 9; 79 80 if (status->flag & RX_FLAG_MACTIME_MPDU) 81 len += 8; 82 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) 83 len += 1; 84 85 if (len & 1) /* padding for RX_FLAGS if necessary */ 86 len++; 87 88 if (status->flag & RX_FLAG_HT) /* HT info */ 89 len += 3; 90 91 return len; 92 } 93 94 /* 95 * ieee80211_add_rx_radiotap_header - add radiotap header 96 * 97 * add a radiotap header containing all the fields which the hardware provided. 98 */ 99 static void 100 ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, 101 struct sk_buff *skb, 102 struct ieee80211_rate *rate, 103 int rtap_len) 104 { 105 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 106 struct ieee80211_radiotap_header *rthdr; 107 unsigned char *pos; 108 u16 rx_flags = 0; 109 110 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len); 111 memset(rthdr, 0, rtap_len); 112 113 /* radiotap header, set always present flags */ 114 rthdr->it_present = 115 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | 116 (1 << IEEE80211_RADIOTAP_CHANNEL) | 117 (1 << IEEE80211_RADIOTAP_ANTENNA) | 118 (1 << IEEE80211_RADIOTAP_RX_FLAGS)); 119 rthdr->it_len = cpu_to_le16(rtap_len); 120 121 pos = (unsigned char *)(rthdr+1); 122 123 /* the order of the following fields is important */ 124 125 /* IEEE80211_RADIOTAP_TSFT */ 126 if (status->flag & RX_FLAG_MACTIME_MPDU) { 127 put_unaligned_le64(status->mactime, pos); 128 rthdr->it_present |= 129 cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT); 130 pos += 8; 131 } 132 133 /* IEEE80211_RADIOTAP_FLAGS */ 134 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) 135 *pos |= IEEE80211_RADIOTAP_F_FCS; 136 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) 137 *pos |= IEEE80211_RADIOTAP_F_BADFCS; 138 if (status->flag & RX_FLAG_SHORTPRE) 139 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE; 140 pos++; 141 142 /* IEEE80211_RADIOTAP_RATE */ 143 if (status->flag & RX_FLAG_HT) { 144 /* 145 * MCS information is a separate field in radiotap, 146 * added below. The byte here is needed as padding 147 * for the channel though, so initialise it to 0. 148 */ 149 *pos = 0; 150 } else { 151 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); 152 *pos = rate->bitrate / 5; 153 } 154 pos++; 155 156 /* IEEE80211_RADIOTAP_CHANNEL */ 157 put_unaligned_le16(status->freq, pos); 158 pos += 2; 159 if (status->band == IEEE80211_BAND_5GHZ) 160 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ, 161 pos); 162 else if (status->flag & RX_FLAG_HT) 163 put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ, 164 pos); 165 else if (rate->flags & IEEE80211_RATE_ERP_G) 166 put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ, 167 pos); 168 else 169 put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ, 170 pos); 171 pos += 2; 172 173 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ 174 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) { 175 *pos = status->signal; 176 rthdr->it_present |= 177 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL); 178 pos++; 179 } 180 181 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ 182 183 /* IEEE80211_RADIOTAP_ANTENNA */ 184 *pos = status->antenna; 185 pos++; 186 187 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ 188 189 /* IEEE80211_RADIOTAP_RX_FLAGS */ 190 /* ensure 2 byte alignment for the 2 byte field as required */ 191 if ((pos - (u8 *)rthdr) & 1) 192 pos++; 193 if (status->flag & RX_FLAG_FAILED_PLCP_CRC) 194 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP; 195 put_unaligned_le16(rx_flags, pos); 196 pos += 2; 197 198 if (status->flag & RX_FLAG_HT) { 199 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS); 200 *pos++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS | 201 IEEE80211_RADIOTAP_MCS_HAVE_GI | 202 IEEE80211_RADIOTAP_MCS_HAVE_BW; 203 *pos = 0; 204 if (status->flag & RX_FLAG_SHORT_GI) 205 *pos |= IEEE80211_RADIOTAP_MCS_SGI; 206 if (status->flag & RX_FLAG_40MHZ) 207 *pos |= IEEE80211_RADIOTAP_MCS_BW_40; 208 pos++; 209 *pos++ = status->rate_idx; 210 } 211 } 212 213 /* 214 * This function copies a received frame to all monitor interfaces and 215 * returns a cleaned-up SKB that no longer includes the FCS nor the 216 * radiotap header the driver might have added. 217 */ 218 static struct sk_buff * 219 ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, 220 struct ieee80211_rate *rate) 221 { 222 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb); 223 struct ieee80211_sub_if_data *sdata; 224 int needed_headroom = 0; 225 struct sk_buff *skb, *skb2; 226 struct net_device *prev_dev = NULL; 227 int present_fcs_len = 0; 228 229 /* 230 * First, we may need to make a copy of the skb because 231 * (1) we need to modify it for radiotap (if not present), and 232 * (2) the other RX handlers will modify the skb we got. 233 * 234 * We don't need to, of course, if we aren't going to return 235 * the SKB because it has a bad FCS/PLCP checksum. 236 */ 237 238 /* room for the radiotap header based on driver features */ 239 needed_headroom = ieee80211_rx_radiotap_len(local, status); 240 241 if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) 242 present_fcs_len = FCS_LEN; 243 244 /* make sure hdr->frame_control is on the linear part */ 245 if (!pskb_may_pull(origskb, 2)) { 246 dev_kfree_skb(origskb); 247 return NULL; 248 } 249 250 if (!local->monitors) { 251 if (should_drop_frame(origskb, present_fcs_len)) { 252 dev_kfree_skb(origskb); 253 return NULL; 254 } 255 256 return remove_monitor_info(local, origskb); 257 } 258 259 if (should_drop_frame(origskb, present_fcs_len)) { 260 /* only need to expand headroom if necessary */ 261 skb = origskb; 262 origskb = NULL; 263 264 /* 265 * This shouldn't trigger often because most devices have an 266 * RX header they pull before we get here, and that should 267 * be big enough for our radiotap information. We should 268 * probably export the length to drivers so that we can have 269 * them allocate enough headroom to start with. 270 */ 271 if (skb_headroom(skb) < needed_headroom && 272 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { 273 dev_kfree_skb(skb); 274 return NULL; 275 } 276 } else { 277 /* 278 * Need to make a copy and possibly remove radiotap header 279 * and FCS from the original. 280 */ 281 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); 282 283 origskb = remove_monitor_info(local, origskb); 284 285 if (!skb) 286 return origskb; 287 } 288 289 /* prepend radiotap information */ 290 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom); 291 292 skb_reset_mac_header(skb); 293 skb->ip_summed = CHECKSUM_UNNECESSARY; 294 skb->pkt_type = PACKET_OTHERHOST; 295 skb->protocol = htons(ETH_P_802_2); 296 297 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 298 if (sdata->vif.type != NL80211_IFTYPE_MONITOR) 299 continue; 300 301 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) 302 continue; 303 304 if (!ieee80211_sdata_running(sdata)) 305 continue; 306 307 if (prev_dev) { 308 skb2 = skb_clone(skb, GFP_ATOMIC); 309 if (skb2) { 310 skb2->dev = prev_dev; 311 netif_receive_skb(skb2); 312 } 313 } 314 315 prev_dev = sdata->dev; 316 sdata->dev->stats.rx_packets++; 317 sdata->dev->stats.rx_bytes += skb->len; 318 } 319 320 if (prev_dev) { 321 skb->dev = prev_dev; 322 netif_receive_skb(skb); 323 } else 324 dev_kfree_skb(skb); 325 326 return origskb; 327 } 328 329 330 static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) 331 { 332 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 333 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 334 int tid, seqno_idx, security_idx; 335 336 /* does the frame have a qos control field? */ 337 if (ieee80211_is_data_qos(hdr->frame_control)) { 338 u8 *qc = ieee80211_get_qos_ctl(hdr); 339 /* frame has qos control */ 340 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 341 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT) 342 status->rx_flags |= IEEE80211_RX_AMSDU; 343 344 seqno_idx = tid; 345 security_idx = tid; 346 } else { 347 /* 348 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): 349 * 350 * Sequence numbers for management frames, QoS data 351 * frames with a broadcast/multicast address in the 352 * Address 1 field, and all non-QoS data frames sent 353 * by QoS STAs are assigned using an additional single 354 * modulo-4096 counter, [...] 355 * 356 * We also use that counter for non-QoS STAs. 357 */ 358 seqno_idx = NUM_RX_DATA_QUEUES; 359 security_idx = 0; 360 if (ieee80211_is_mgmt(hdr->frame_control)) 361 security_idx = NUM_RX_DATA_QUEUES; 362 tid = 0; 363 } 364 365 rx->seqno_idx = seqno_idx; 366 rx->security_idx = security_idx; 367 /* Set skb->priority to 1d tag if highest order bit of TID is not set. 368 * For now, set skb->priority to 0 for other cases. */ 369 rx->skb->priority = (tid > 7) ? 0 : tid; 370 } 371 372 /** 373 * DOC: Packet alignment 374 * 375 * Drivers always need to pass packets that are aligned to two-byte boundaries 376 * to the stack. 377 * 378 * Additionally, should, if possible, align the payload data in a way that 379 * guarantees that the contained IP header is aligned to a four-byte 380 * boundary. In the case of regular frames, this simply means aligning the 381 * payload to a four-byte boundary (because either the IP header is directly 382 * contained, or IV/RFC1042 headers that have a length divisible by four are 383 * in front of it). If the payload data is not properly aligned and the 384 * architecture doesn't support efficient unaligned operations, mac80211 385 * will align the data. 386 * 387 * With A-MSDU frames, however, the payload data address must yield two modulo 388 * four because there are 14-byte 802.3 headers within the A-MSDU frames that 389 * push the IP header further back to a multiple of four again. Thankfully, the 390 * specs were sane enough this time around to require padding each A-MSDU 391 * subframe to a length that is a multiple of four. 392 * 393 * Padding like Atheros hardware adds which is between the 802.11 header and 394 * the payload is not supported, the driver is required to move the 802.11 395 * header to be directly in front of the payload in that case. 396 */ 397 static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx) 398 { 399 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 400 WARN_ONCE((unsigned long)rx->skb->data & 1, 401 "unaligned packet at 0x%p\n", rx->skb->data); 402 #endif 403 } 404 405 406 /* rx handlers */ 407 408 static ieee80211_rx_result debug_noinline 409 ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx) 410 { 411 struct ieee80211_local *local = rx->local; 412 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 413 struct sk_buff *skb = rx->skb; 414 415 if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN) && 416 !local->sched_scanning)) 417 return RX_CONTINUE; 418 419 if (test_bit(SCAN_HW_SCANNING, &local->scanning) || 420 test_bit(SCAN_SW_SCANNING, &local->scanning) || 421 local->sched_scanning) 422 return ieee80211_scan_rx(rx->sdata, skb); 423 424 /* scanning finished during invoking of handlers */ 425 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); 426 return RX_DROP_UNUSABLE; 427 } 428 429 430 static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb) 431 { 432 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 433 434 if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1)) 435 return 0; 436 437 return ieee80211_is_robust_mgmt_frame(hdr); 438 } 439 440 441 static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb) 442 { 443 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 444 445 if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1)) 446 return 0; 447 448 return ieee80211_is_robust_mgmt_frame(hdr); 449 } 450 451 452 /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */ 453 static int ieee80211_get_mmie_keyidx(struct sk_buff *skb) 454 { 455 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data; 456 struct ieee80211_mmie *mmie; 457 458 if (skb->len < 24 + sizeof(*mmie) || 459 !is_multicast_ether_addr(hdr->da)) 460 return -1; 461 462 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr)) 463 return -1; /* not a robust management frame */ 464 465 mmie = (struct ieee80211_mmie *) 466 (skb->data + skb->len - sizeof(*mmie)); 467 if (mmie->element_id != WLAN_EID_MMIE || 468 mmie->length != sizeof(*mmie) - 2) 469 return -1; 470 471 return le16_to_cpu(mmie->key_id); 472 } 473 474 475 static ieee80211_rx_result 476 ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) 477 { 478 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 479 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control); 480 char *dev_addr = rx->sdata->vif.addr; 481 482 if (ieee80211_is_data(hdr->frame_control)) { 483 if (is_multicast_ether_addr(hdr->addr1)) { 484 if (ieee80211_has_tods(hdr->frame_control) || 485 !ieee80211_has_fromds(hdr->frame_control)) 486 return RX_DROP_MONITOR; 487 if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0) 488 return RX_DROP_MONITOR; 489 } else { 490 if (!ieee80211_has_a4(hdr->frame_control)) 491 return RX_DROP_MONITOR; 492 if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0) 493 return RX_DROP_MONITOR; 494 } 495 } 496 497 /* If there is not an established peer link and this is not a peer link 498 * establisment frame, beacon or probe, drop the frame. 499 */ 500 501 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) { 502 struct ieee80211_mgmt *mgmt; 503 504 if (!ieee80211_is_mgmt(hdr->frame_control)) 505 return RX_DROP_MONITOR; 506 507 if (ieee80211_is_action(hdr->frame_control)) { 508 u8 category; 509 mgmt = (struct ieee80211_mgmt *)hdr; 510 category = mgmt->u.action.category; 511 if (category != WLAN_CATEGORY_MESH_ACTION && 512 category != WLAN_CATEGORY_SELF_PROTECTED) 513 return RX_DROP_MONITOR; 514 return RX_CONTINUE; 515 } 516 517 if (ieee80211_is_probe_req(hdr->frame_control) || 518 ieee80211_is_probe_resp(hdr->frame_control) || 519 ieee80211_is_beacon(hdr->frame_control) || 520 ieee80211_is_auth(hdr->frame_control)) 521 return RX_CONTINUE; 522 523 return RX_DROP_MONITOR; 524 525 } 526 527 #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l)) 528 529 if (ieee80211_is_data(hdr->frame_control) && 530 is_multicast_ether_addr(hdr->addr1) && 531 mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata)) 532 return RX_DROP_MONITOR; 533 #undef msh_h_get 534 535 return RX_CONTINUE; 536 } 537 538 #define SEQ_MODULO 0x1000 539 #define SEQ_MASK 0xfff 540 541 static inline int seq_less(u16 sq1, u16 sq2) 542 { 543 return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1); 544 } 545 546 static inline u16 seq_inc(u16 sq) 547 { 548 return (sq + 1) & SEQ_MASK; 549 } 550 551 static inline u16 seq_sub(u16 sq1, u16 sq2) 552 { 553 return (sq1 - sq2) & SEQ_MASK; 554 } 555 556 557 static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw, 558 struct tid_ampdu_rx *tid_agg_rx, 559 int index) 560 { 561 struct ieee80211_local *local = hw_to_local(hw); 562 struct sk_buff *skb = tid_agg_rx->reorder_buf[index]; 563 struct ieee80211_rx_status *status; 564 565 lockdep_assert_held(&tid_agg_rx->reorder_lock); 566 567 if (!skb) 568 goto no_frame; 569 570 /* release the frame from the reorder ring buffer */ 571 tid_agg_rx->stored_mpdu_num--; 572 tid_agg_rx->reorder_buf[index] = NULL; 573 status = IEEE80211_SKB_RXCB(skb); 574 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE; 575 skb_queue_tail(&local->rx_skb_queue, skb); 576 577 no_frame: 578 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); 579 } 580 581 static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw, 582 struct tid_ampdu_rx *tid_agg_rx, 583 u16 head_seq_num) 584 { 585 int index; 586 587 lockdep_assert_held(&tid_agg_rx->reorder_lock); 588 589 while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { 590 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % 591 tid_agg_rx->buf_size; 592 ieee80211_release_reorder_frame(hw, tid_agg_rx, index); 593 } 594 } 595 596 /* 597 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If 598 * the skb was added to the buffer longer than this time ago, the earlier 599 * frames that have not yet been received are assumed to be lost and the skb 600 * can be released for processing. This may also release other skb's from the 601 * reorder buffer if there are no additional gaps between the frames. 602 * 603 * Callers must hold tid_agg_rx->reorder_lock. 604 */ 605 #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10) 606 607 static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw, 608 struct tid_ampdu_rx *tid_agg_rx) 609 { 610 int index, j; 611 612 lockdep_assert_held(&tid_agg_rx->reorder_lock); 613 614 /* release the buffer until next missing frame */ 615 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % 616 tid_agg_rx->buf_size; 617 if (!tid_agg_rx->reorder_buf[index] && 618 tid_agg_rx->stored_mpdu_num > 1) { 619 /* 620 * No buffers ready to be released, but check whether any 621 * frames in the reorder buffer have timed out. 622 */ 623 int skipped = 1; 624 for (j = (index + 1) % tid_agg_rx->buf_size; j != index; 625 j = (j + 1) % tid_agg_rx->buf_size) { 626 if (!tid_agg_rx->reorder_buf[j]) { 627 skipped++; 628 continue; 629 } 630 if (skipped && 631 !time_after(jiffies, tid_agg_rx->reorder_time[j] + 632 HT_RX_REORDER_BUF_TIMEOUT)) 633 goto set_release_timer; 634 635 #ifdef CONFIG_MAC80211_HT_DEBUG 636 if (net_ratelimit()) 637 wiphy_debug(hw->wiphy, 638 "release an RX reorder frame due to timeout on earlier frames\n"); 639 #endif 640 ieee80211_release_reorder_frame(hw, tid_agg_rx, j); 641 642 /* 643 * Increment the head seq# also for the skipped slots. 644 */ 645 tid_agg_rx->head_seq_num = 646 (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK; 647 skipped = 0; 648 } 649 } else while (tid_agg_rx->reorder_buf[index]) { 650 ieee80211_release_reorder_frame(hw, tid_agg_rx, index); 651 index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % 652 tid_agg_rx->buf_size; 653 } 654 655 if (tid_agg_rx->stored_mpdu_num) { 656 j = index = seq_sub(tid_agg_rx->head_seq_num, 657 tid_agg_rx->ssn) % tid_agg_rx->buf_size; 658 659 for (; j != (index - 1) % tid_agg_rx->buf_size; 660 j = (j + 1) % tid_agg_rx->buf_size) { 661 if (tid_agg_rx->reorder_buf[j]) 662 break; 663 } 664 665 set_release_timer: 666 667 mod_timer(&tid_agg_rx->reorder_timer, 668 tid_agg_rx->reorder_time[j] + 1 + 669 HT_RX_REORDER_BUF_TIMEOUT); 670 } else { 671 del_timer(&tid_agg_rx->reorder_timer); 672 } 673 } 674 675 /* 676 * As this function belongs to the RX path it must be under 677 * rcu_read_lock protection. It returns false if the frame 678 * can be processed immediately, true if it was consumed. 679 */ 680 static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, 681 struct tid_ampdu_rx *tid_agg_rx, 682 struct sk_buff *skb) 683 { 684 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 685 u16 sc = le16_to_cpu(hdr->seq_ctrl); 686 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; 687 u16 head_seq_num, buf_size; 688 int index; 689 bool ret = true; 690 691 spin_lock(&tid_agg_rx->reorder_lock); 692 693 buf_size = tid_agg_rx->buf_size; 694 head_seq_num = tid_agg_rx->head_seq_num; 695 696 /* frame with out of date sequence number */ 697 if (seq_less(mpdu_seq_num, head_seq_num)) { 698 dev_kfree_skb(skb); 699 goto out; 700 } 701 702 /* 703 * If frame the sequence number exceeds our buffering window 704 * size release some previous frames to make room for this one. 705 */ 706 if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) { 707 head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size)); 708 /* release stored frames up to new head to stack */ 709 ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num); 710 } 711 712 /* Now the new frame is always in the range of the reordering buffer */ 713 714 index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size; 715 716 /* check if we already stored this frame */ 717 if (tid_agg_rx->reorder_buf[index]) { 718 dev_kfree_skb(skb); 719 goto out; 720 } 721 722 /* 723 * If the current MPDU is in the right order and nothing else 724 * is stored we can process it directly, no need to buffer it. 725 * If it is first but there's something stored, we may be able 726 * to release frames after this one. 727 */ 728 if (mpdu_seq_num == tid_agg_rx->head_seq_num && 729 tid_agg_rx->stored_mpdu_num == 0) { 730 tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); 731 ret = false; 732 goto out; 733 } 734 735 /* put the frame in the reordering buffer */ 736 tid_agg_rx->reorder_buf[index] = skb; 737 tid_agg_rx->reorder_time[index] = jiffies; 738 tid_agg_rx->stored_mpdu_num++; 739 ieee80211_sta_reorder_release(hw, tid_agg_rx); 740 741 out: 742 spin_unlock(&tid_agg_rx->reorder_lock); 743 return ret; 744 } 745 746 /* 747 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns 748 * true if the MPDU was buffered, false if it should be processed. 749 */ 750 static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx) 751 { 752 struct sk_buff *skb = rx->skb; 753 struct ieee80211_local *local = rx->local; 754 struct ieee80211_hw *hw = &local->hw; 755 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 756 struct sta_info *sta = rx->sta; 757 struct tid_ampdu_rx *tid_agg_rx; 758 u16 sc; 759 int tid; 760 761 if (!ieee80211_is_data_qos(hdr->frame_control)) 762 goto dont_reorder; 763 764 /* 765 * filter the QoS data rx stream according to 766 * STA/TID and check if this STA/TID is on aggregation 767 */ 768 769 if (!sta) 770 goto dont_reorder; 771 772 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; 773 774 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 775 if (!tid_agg_rx) 776 goto dont_reorder; 777 778 /* qos null data frames are excluded */ 779 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) 780 goto dont_reorder; 781 782 /* new, potentially un-ordered, ampdu frame - process it */ 783 784 /* reset session timer */ 785 if (tid_agg_rx->timeout) 786 mod_timer(&tid_agg_rx->session_timer, 787 TU_TO_EXP_TIME(tid_agg_rx->timeout)); 788 789 /* if this mpdu is fragmented - terminate rx aggregation session */ 790 sc = le16_to_cpu(hdr->seq_ctrl); 791 if (sc & IEEE80211_SCTL_FRAG) { 792 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; 793 skb_queue_tail(&rx->sdata->skb_queue, skb); 794 ieee80211_queue_work(&local->hw, &rx->sdata->work); 795 return; 796 } 797 798 /* 799 * No locking needed -- we will only ever process one 800 * RX packet at a time, and thus own tid_agg_rx. All 801 * other code manipulating it needs to (and does) make 802 * sure that we cannot get to it any more before doing 803 * anything with it. 804 */ 805 if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb)) 806 return; 807 808 dont_reorder: 809 skb_queue_tail(&local->rx_skb_queue, skb); 810 } 811 812 static ieee80211_rx_result debug_noinline 813 ieee80211_rx_h_check(struct ieee80211_rx_data *rx) 814 { 815 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 816 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 817 818 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ 819 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { 820 if (unlikely(ieee80211_has_retry(hdr->frame_control) && 821 rx->sta->last_seq_ctrl[rx->seqno_idx] == 822 hdr->seq_ctrl)) { 823 if (status->rx_flags & IEEE80211_RX_RA_MATCH) { 824 rx->local->dot11FrameDuplicateCount++; 825 rx->sta->num_duplicates++; 826 } 827 return RX_DROP_UNUSABLE; 828 } else 829 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl; 830 } 831 832 if (unlikely(rx->skb->len < 16)) { 833 I802_DEBUG_INC(rx->local->rx_handlers_drop_short); 834 return RX_DROP_MONITOR; 835 } 836 837 /* Drop disallowed frame classes based on STA auth/assoc state; 838 * IEEE 802.11, Chap 5.5. 839 * 840 * mac80211 filters only based on association state, i.e. it drops 841 * Class 3 frames from not associated stations. hostapd sends 842 * deauth/disassoc frames when needed. In addition, hostapd is 843 * responsible for filtering on both auth and assoc states. 844 */ 845 846 if (ieee80211_vif_is_mesh(&rx->sdata->vif)) 847 return ieee80211_rx_mesh_check(rx); 848 849 if (unlikely((ieee80211_is_data(hdr->frame_control) || 850 ieee80211_is_pspoll(hdr->frame_control)) && 851 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && 852 rx->sdata->vif.type != NL80211_IFTYPE_WDS && 853 (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) 854 return RX_DROP_MONITOR; 855 856 return RX_CONTINUE; 857 } 858 859 860 static ieee80211_rx_result debug_noinline 861 ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) 862 { 863 struct sk_buff *skb = rx->skb; 864 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 865 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 866 int keyidx; 867 int hdrlen; 868 ieee80211_rx_result result = RX_DROP_UNUSABLE; 869 struct ieee80211_key *sta_ptk = NULL; 870 int mmie_keyidx = -1; 871 __le16 fc; 872 873 /* 874 * Key selection 101 875 * 876 * There are four types of keys: 877 * - GTK (group keys) 878 * - IGTK (group keys for management frames) 879 * - PTK (pairwise keys) 880 * - STK (station-to-station pairwise keys) 881 * 882 * When selecting a key, we have to distinguish between multicast 883 * (including broadcast) and unicast frames, the latter can only 884 * use PTKs and STKs while the former always use GTKs and IGTKs. 885 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then 886 * unicast frames can also use key indices like GTKs. Hence, if we 887 * don't have a PTK/STK we check the key index for a WEP key. 888 * 889 * Note that in a regular BSS, multicast frames are sent by the 890 * AP only, associated stations unicast the frame to the AP first 891 * which then multicasts it on their behalf. 892 * 893 * There is also a slight problem in IBSS mode: GTKs are negotiated 894 * with each station, that is something we don't currently handle. 895 * The spec seems to expect that one negotiates the same key with 896 * every station but there's no such requirement; VLANs could be 897 * possible. 898 */ 899 900 /* 901 * No point in finding a key and decrypting if the frame is neither 902 * addressed to us nor a multicast frame. 903 */ 904 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) 905 return RX_CONTINUE; 906 907 /* start without a key */ 908 rx->key = NULL; 909 910 if (rx->sta) 911 sta_ptk = rcu_dereference(rx->sta->ptk); 912 913 fc = hdr->frame_control; 914 915 if (!ieee80211_has_protected(fc)) 916 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); 917 918 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) { 919 rx->key = sta_ptk; 920 if ((status->flag & RX_FLAG_DECRYPTED) && 921 (status->flag & RX_FLAG_IV_STRIPPED)) 922 return RX_CONTINUE; 923 /* Skip decryption if the frame is not protected. */ 924 if (!ieee80211_has_protected(fc)) 925 return RX_CONTINUE; 926 } else if (mmie_keyidx >= 0) { 927 /* Broadcast/multicast robust management frame / BIP */ 928 if ((status->flag & RX_FLAG_DECRYPTED) && 929 (status->flag & RX_FLAG_IV_STRIPPED)) 930 return RX_CONTINUE; 931 932 if (mmie_keyidx < NUM_DEFAULT_KEYS || 933 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) 934 return RX_DROP_MONITOR; /* unexpected BIP keyidx */ 935 if (rx->sta) 936 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]); 937 if (!rx->key) 938 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]); 939 } else if (!ieee80211_has_protected(fc)) { 940 /* 941 * The frame was not protected, so skip decryption. However, we 942 * need to set rx->key if there is a key that could have been 943 * used so that the frame may be dropped if encryption would 944 * have been expected. 945 */ 946 struct ieee80211_key *key = NULL; 947 struct ieee80211_sub_if_data *sdata = rx->sdata; 948 int i; 949 950 if (ieee80211_is_mgmt(fc) && 951 is_multicast_ether_addr(hdr->addr1) && 952 (key = rcu_dereference(rx->sdata->default_mgmt_key))) 953 rx->key = key; 954 else { 955 if (rx->sta) { 956 for (i = 0; i < NUM_DEFAULT_KEYS; i++) { 957 key = rcu_dereference(rx->sta->gtk[i]); 958 if (key) 959 break; 960 } 961 } 962 if (!key) { 963 for (i = 0; i < NUM_DEFAULT_KEYS; i++) { 964 key = rcu_dereference(sdata->keys[i]); 965 if (key) 966 break; 967 } 968 } 969 if (key) 970 rx->key = key; 971 } 972 return RX_CONTINUE; 973 } else { 974 u8 keyid; 975 /* 976 * The device doesn't give us the IV so we won't be 977 * able to look up the key. That's ok though, we 978 * don't need to decrypt the frame, we just won't 979 * be able to keep statistics accurate. 980 * Except for key threshold notifications, should 981 * we somehow allow the driver to tell us which key 982 * the hardware used if this flag is set? 983 */ 984 if ((status->flag & RX_FLAG_DECRYPTED) && 985 (status->flag & RX_FLAG_IV_STRIPPED)) 986 return RX_CONTINUE; 987 988 hdrlen = ieee80211_hdrlen(fc); 989 990 if (rx->skb->len < 8 + hdrlen) 991 return RX_DROP_UNUSABLE; /* TODO: count this? */ 992 993 /* 994 * no need to call ieee80211_wep_get_keyidx, 995 * it verifies a bunch of things we've done already 996 */ 997 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1); 998 keyidx = keyid >> 6; 999 1000 /* check per-station GTK first, if multicast packet */ 1001 if (is_multicast_ether_addr(hdr->addr1) && rx->sta) 1002 rx->key = rcu_dereference(rx->sta->gtk[keyidx]); 1003 1004 /* if not found, try default key */ 1005 if (!rx->key) { 1006 rx->key = rcu_dereference(rx->sdata->keys[keyidx]); 1007 1008 /* 1009 * RSNA-protected unicast frames should always be 1010 * sent with pairwise or station-to-station keys, 1011 * but for WEP we allow using a key index as well. 1012 */ 1013 if (rx->key && 1014 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 && 1015 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 && 1016 !is_multicast_ether_addr(hdr->addr1)) 1017 rx->key = NULL; 1018 } 1019 } 1020 1021 if (rx->key) { 1022 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED)) 1023 return RX_DROP_MONITOR; 1024 1025 rx->key->tx_rx_count++; 1026 /* TODO: add threshold stuff again */ 1027 } else { 1028 return RX_DROP_MONITOR; 1029 } 1030 1031 if (skb_linearize(rx->skb)) 1032 return RX_DROP_UNUSABLE; 1033 /* the hdr variable is invalid now! */ 1034 1035 switch (rx->key->conf.cipher) { 1036 case WLAN_CIPHER_SUITE_WEP40: 1037 case WLAN_CIPHER_SUITE_WEP104: 1038 /* Check for weak IVs if possible */ 1039 if (rx->sta && ieee80211_is_data(fc) && 1040 (!(status->flag & RX_FLAG_IV_STRIPPED) || 1041 !(status->flag & RX_FLAG_DECRYPTED)) && 1042 ieee80211_wep_is_weak_iv(rx->skb, rx->key)) 1043 rx->sta->wep_weak_iv_count++; 1044 1045 result = ieee80211_crypto_wep_decrypt(rx); 1046 break; 1047 case WLAN_CIPHER_SUITE_TKIP: 1048 result = ieee80211_crypto_tkip_decrypt(rx); 1049 break; 1050 case WLAN_CIPHER_SUITE_CCMP: 1051 result = ieee80211_crypto_ccmp_decrypt(rx); 1052 break; 1053 case WLAN_CIPHER_SUITE_AES_CMAC: 1054 result = ieee80211_crypto_aes_cmac_decrypt(rx); 1055 break; 1056 default: 1057 /* 1058 * We can reach here only with HW-only algorithms 1059 * but why didn't it decrypt the frame?! 1060 */ 1061 return RX_DROP_UNUSABLE; 1062 } 1063 1064 /* either the frame has been decrypted or will be dropped */ 1065 status->flag |= RX_FLAG_DECRYPTED; 1066 1067 return result; 1068 } 1069 1070 static ieee80211_rx_result debug_noinline 1071 ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) 1072 { 1073 struct ieee80211_local *local; 1074 struct ieee80211_hdr *hdr; 1075 struct sk_buff *skb; 1076 1077 local = rx->local; 1078 skb = rx->skb; 1079 hdr = (struct ieee80211_hdr *) skb->data; 1080 1081 if (!local->pspolling) 1082 return RX_CONTINUE; 1083 1084 if (!ieee80211_has_fromds(hdr->frame_control)) 1085 /* this is not from AP */ 1086 return RX_CONTINUE; 1087 1088 if (!ieee80211_is_data(hdr->frame_control)) 1089 return RX_CONTINUE; 1090 1091 if (!ieee80211_has_moredata(hdr->frame_control)) { 1092 /* AP has no more frames buffered for us */ 1093 local->pspolling = false; 1094 return RX_CONTINUE; 1095 } 1096 1097 /* more data bit is set, let's request a new frame from the AP */ 1098 ieee80211_send_pspoll(local, rx->sdata); 1099 1100 return RX_CONTINUE; 1101 } 1102 1103 static void ap_sta_ps_start(struct sta_info *sta) 1104 { 1105 struct ieee80211_sub_if_data *sdata = sta->sdata; 1106 struct ieee80211_local *local = sdata->local; 1107 1108 atomic_inc(&sdata->bss->num_sta_ps); 1109 set_sta_flags(sta, WLAN_STA_PS_STA); 1110 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS)) 1111 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta); 1112 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 1113 printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n", 1114 sdata->name, sta->sta.addr, sta->sta.aid); 1115 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ 1116 } 1117 1118 static void ap_sta_ps_end(struct sta_info *sta) 1119 { 1120 struct ieee80211_sub_if_data *sdata = sta->sdata; 1121 1122 atomic_dec(&sdata->bss->num_sta_ps); 1123 1124 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 1125 printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n", 1126 sdata->name, sta->sta.addr, sta->sta.aid); 1127 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ 1128 1129 if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) { 1130 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 1131 printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n", 1132 sdata->name, sta->sta.addr, sta->sta.aid); 1133 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ 1134 return; 1135 } 1136 1137 ieee80211_sta_ps_deliver_wakeup(sta); 1138 } 1139 1140 int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start) 1141 { 1142 struct sta_info *sta_inf = container_of(sta, struct sta_info, sta); 1143 bool in_ps; 1144 1145 WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS)); 1146 1147 /* Don't let the same PS state be set twice */ 1148 in_ps = test_sta_flags(sta_inf, WLAN_STA_PS_STA); 1149 if ((start && in_ps) || (!start && !in_ps)) 1150 return -EINVAL; 1151 1152 if (start) 1153 ap_sta_ps_start(sta_inf); 1154 else 1155 ap_sta_ps_end(sta_inf); 1156 1157 return 0; 1158 } 1159 EXPORT_SYMBOL(ieee80211_sta_ps_transition); 1160 1161 static ieee80211_rx_result debug_noinline 1162 ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) 1163 { 1164 struct sta_info *sta = rx->sta; 1165 struct sk_buff *skb = rx->skb; 1166 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 1167 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1168 1169 if (!sta) 1170 return RX_CONTINUE; 1171 1172 /* 1173 * Update last_rx only for IBSS packets which are for the current 1174 * BSSID to avoid keeping the current IBSS network alive in cases 1175 * where other STAs start using different BSSID. 1176 */ 1177 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { 1178 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, 1179 NL80211_IFTYPE_ADHOC); 1180 if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) { 1181 sta->last_rx = jiffies; 1182 if (ieee80211_is_data(hdr->frame_control)) { 1183 sta->last_rx_rate_idx = status->rate_idx; 1184 sta->last_rx_rate_flag = status->flag; 1185 } 1186 } 1187 } else if (!is_multicast_ether_addr(hdr->addr1)) { 1188 /* 1189 * Mesh beacons will update last_rx when if they are found to 1190 * match the current local configuration when processed. 1191 */ 1192 sta->last_rx = jiffies; 1193 if (ieee80211_is_data(hdr->frame_control)) { 1194 sta->last_rx_rate_idx = status->rate_idx; 1195 sta->last_rx_rate_flag = status->flag; 1196 } 1197 } 1198 1199 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) 1200 return RX_CONTINUE; 1201 1202 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION) 1203 ieee80211_sta_rx_notify(rx->sdata, hdr); 1204 1205 sta->rx_fragments++; 1206 sta->rx_bytes += rx->skb->len; 1207 sta->last_signal = status->signal; 1208 ewma_add(&sta->avg_signal, -status->signal); 1209 1210 /* 1211 * Change STA power saving mode only at the end of a frame 1212 * exchange sequence. 1213 */ 1214 if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) && 1215 !ieee80211_has_morefrags(hdr->frame_control) && 1216 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && 1217 (rx->sdata->vif.type == NL80211_IFTYPE_AP || 1218 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { 1219 if (test_sta_flags(sta, WLAN_STA_PS_STA)) { 1220 /* 1221 * Ignore doze->wake transitions that are 1222 * indicated by non-data frames, the standard 1223 * is unclear here, but for example going to 1224 * PS mode and then scanning would cause a 1225 * doze->wake transition for the probe request, 1226 * and that is clearly undesirable. 1227 */ 1228 if (ieee80211_is_data(hdr->frame_control) && 1229 !ieee80211_has_pm(hdr->frame_control)) 1230 ap_sta_ps_end(sta); 1231 } else { 1232 if (ieee80211_has_pm(hdr->frame_control)) 1233 ap_sta_ps_start(sta); 1234 } 1235 } 1236 1237 /* 1238 * Drop (qos-)data::nullfunc frames silently, since they 1239 * are used only to control station power saving mode. 1240 */ 1241 if (ieee80211_is_nullfunc(hdr->frame_control) || 1242 ieee80211_is_qos_nullfunc(hdr->frame_control)) { 1243 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); 1244 1245 /* 1246 * If we receive a 4-addr nullfunc frame from a STA 1247 * that was not moved to a 4-addr STA vlan yet, drop 1248 * the frame to the monitor interface, to make sure 1249 * that hostapd sees it 1250 */ 1251 if (ieee80211_has_a4(hdr->frame_control) && 1252 (rx->sdata->vif.type == NL80211_IFTYPE_AP || 1253 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 1254 !rx->sdata->u.vlan.sta))) 1255 return RX_DROP_MONITOR; 1256 /* 1257 * Update counter and free packet here to avoid 1258 * counting this as a dropped packed. 1259 */ 1260 sta->rx_packets++; 1261 dev_kfree_skb(rx->skb); 1262 return RX_QUEUED; 1263 } 1264 1265 return RX_CONTINUE; 1266 } /* ieee80211_rx_h_sta_process */ 1267 1268 static inline struct ieee80211_fragment_entry * 1269 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, 1270 unsigned int frag, unsigned int seq, int rx_queue, 1271 struct sk_buff **skb) 1272 { 1273 struct ieee80211_fragment_entry *entry; 1274 int idx; 1275 1276 idx = sdata->fragment_next; 1277 entry = &sdata->fragments[sdata->fragment_next++]; 1278 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) 1279 sdata->fragment_next = 0; 1280 1281 if (!skb_queue_empty(&entry->skb_list)) { 1282 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1283 struct ieee80211_hdr *hdr = 1284 (struct ieee80211_hdr *) entry->skb_list.next->data; 1285 printk(KERN_DEBUG "%s: RX reassembly removed oldest " 1286 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " 1287 "addr1=%pM addr2=%pM\n", 1288 sdata->name, idx, 1289 jiffies - entry->first_frag_time, entry->seq, 1290 entry->last_frag, hdr->addr1, hdr->addr2); 1291 #endif 1292 __skb_queue_purge(&entry->skb_list); 1293 } 1294 1295 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ 1296 *skb = NULL; 1297 entry->first_frag_time = jiffies; 1298 entry->seq = seq; 1299 entry->rx_queue = rx_queue; 1300 entry->last_frag = frag; 1301 entry->ccmp = 0; 1302 entry->extra_len = 0; 1303 1304 return entry; 1305 } 1306 1307 static inline struct ieee80211_fragment_entry * 1308 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, 1309 unsigned int frag, unsigned int seq, 1310 int rx_queue, struct ieee80211_hdr *hdr) 1311 { 1312 struct ieee80211_fragment_entry *entry; 1313 int i, idx; 1314 1315 idx = sdata->fragment_next; 1316 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { 1317 struct ieee80211_hdr *f_hdr; 1318 1319 idx--; 1320 if (idx < 0) 1321 idx = IEEE80211_FRAGMENT_MAX - 1; 1322 1323 entry = &sdata->fragments[idx]; 1324 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || 1325 entry->rx_queue != rx_queue || 1326 entry->last_frag + 1 != frag) 1327 continue; 1328 1329 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data; 1330 1331 /* 1332 * Check ftype and addresses are equal, else check next fragment 1333 */ 1334 if (((hdr->frame_control ^ f_hdr->frame_control) & 1335 cpu_to_le16(IEEE80211_FCTL_FTYPE)) || 1336 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || 1337 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) 1338 continue; 1339 1340 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { 1341 __skb_queue_purge(&entry->skb_list); 1342 continue; 1343 } 1344 return entry; 1345 } 1346 1347 return NULL; 1348 } 1349 1350 static ieee80211_rx_result debug_noinline 1351 ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) 1352 { 1353 struct ieee80211_hdr *hdr; 1354 u16 sc; 1355 __le16 fc; 1356 unsigned int frag, seq; 1357 struct ieee80211_fragment_entry *entry; 1358 struct sk_buff *skb; 1359 struct ieee80211_rx_status *status; 1360 1361 hdr = (struct ieee80211_hdr *)rx->skb->data; 1362 fc = hdr->frame_control; 1363 sc = le16_to_cpu(hdr->seq_ctrl); 1364 frag = sc & IEEE80211_SCTL_FRAG; 1365 1366 if (likely((!ieee80211_has_morefrags(fc) && frag == 0) || 1367 (rx->skb)->len < 24 || 1368 is_multicast_ether_addr(hdr->addr1))) { 1369 /* not fragmented */ 1370 goto out; 1371 } 1372 I802_DEBUG_INC(rx->local->rx_handlers_fragments); 1373 1374 if (skb_linearize(rx->skb)) 1375 return RX_DROP_UNUSABLE; 1376 1377 /* 1378 * skb_linearize() might change the skb->data and 1379 * previously cached variables (in this case, hdr) need to 1380 * be refreshed with the new data. 1381 */ 1382 hdr = (struct ieee80211_hdr *)rx->skb->data; 1383 seq = (sc & IEEE80211_SCTL_SEQ) >> 4; 1384 1385 if (frag == 0) { 1386 /* This is the first fragment of a new frame. */ 1387 entry = ieee80211_reassemble_add(rx->sdata, frag, seq, 1388 rx->seqno_idx, &(rx->skb)); 1389 if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP && 1390 ieee80211_has_protected(fc)) { 1391 int queue = rx->security_idx; 1392 /* Store CCMP PN so that we can verify that the next 1393 * fragment has a sequential PN value. */ 1394 entry->ccmp = 1; 1395 memcpy(entry->last_pn, 1396 rx->key->u.ccmp.rx_pn[queue], 1397 CCMP_PN_LEN); 1398 } 1399 return RX_QUEUED; 1400 } 1401 1402 /* This is a fragment for a frame that should already be pending in 1403 * fragment cache. Add this fragment to the end of the pending entry. 1404 */ 1405 entry = ieee80211_reassemble_find(rx->sdata, frag, seq, 1406 rx->seqno_idx, hdr); 1407 if (!entry) { 1408 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); 1409 return RX_DROP_MONITOR; 1410 } 1411 1412 /* Verify that MPDUs within one MSDU have sequential PN values. 1413 * (IEEE 802.11i, 8.3.3.4.5) */ 1414 if (entry->ccmp) { 1415 int i; 1416 u8 pn[CCMP_PN_LEN], *rpn; 1417 int queue; 1418 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP) 1419 return RX_DROP_UNUSABLE; 1420 memcpy(pn, entry->last_pn, CCMP_PN_LEN); 1421 for (i = CCMP_PN_LEN - 1; i >= 0; i--) { 1422 pn[i]++; 1423 if (pn[i]) 1424 break; 1425 } 1426 queue = rx->security_idx; 1427 rpn = rx->key->u.ccmp.rx_pn[queue]; 1428 if (memcmp(pn, rpn, CCMP_PN_LEN)) 1429 return RX_DROP_UNUSABLE; 1430 memcpy(entry->last_pn, pn, CCMP_PN_LEN); 1431 } 1432 1433 skb_pull(rx->skb, ieee80211_hdrlen(fc)); 1434 __skb_queue_tail(&entry->skb_list, rx->skb); 1435 entry->last_frag = frag; 1436 entry->extra_len += rx->skb->len; 1437 if (ieee80211_has_morefrags(fc)) { 1438 rx->skb = NULL; 1439 return RX_QUEUED; 1440 } 1441 1442 rx->skb = __skb_dequeue(&entry->skb_list); 1443 if (skb_tailroom(rx->skb) < entry->extra_len) { 1444 I802_DEBUG_INC(rx->local->rx_expand_skb_head2); 1445 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, 1446 GFP_ATOMIC))) { 1447 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); 1448 __skb_queue_purge(&entry->skb_list); 1449 return RX_DROP_UNUSABLE; 1450 } 1451 } 1452 while ((skb = __skb_dequeue(&entry->skb_list))) { 1453 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); 1454 dev_kfree_skb(skb); 1455 } 1456 1457 /* Complete frame has been reassembled - process it now */ 1458 status = IEEE80211_SKB_RXCB(rx->skb); 1459 status->rx_flags |= IEEE80211_RX_FRAGMENTED; 1460 1461 out: 1462 if (rx->sta) 1463 rx->sta->rx_packets++; 1464 if (is_multicast_ether_addr(hdr->addr1)) 1465 rx->local->dot11MulticastReceivedFrameCount++; 1466 else 1467 ieee80211_led_rx(rx->local); 1468 return RX_CONTINUE; 1469 } 1470 1471 static ieee80211_rx_result debug_noinline 1472 ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx) 1473 { 1474 struct ieee80211_sub_if_data *sdata = rx->sdata; 1475 __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control; 1476 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 1477 1478 if (likely(!rx->sta || !ieee80211_is_pspoll(fc) || 1479 !(status->rx_flags & IEEE80211_RX_RA_MATCH))) 1480 return RX_CONTINUE; 1481 1482 if ((sdata->vif.type != NL80211_IFTYPE_AP) && 1483 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1484 return RX_DROP_UNUSABLE; 1485 1486 if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER)) 1487 ieee80211_sta_ps_deliver_poll_response(rx->sta); 1488 else 1489 set_sta_flags(rx->sta, WLAN_STA_PSPOLL); 1490 1491 /* Free PS Poll skb here instead of returning RX_DROP that would 1492 * count as an dropped frame. */ 1493 dev_kfree_skb(rx->skb); 1494 1495 return RX_QUEUED; 1496 } 1497 1498 static ieee80211_rx_result debug_noinline 1499 ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx) 1500 { 1501 u8 *data = rx->skb->data; 1502 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data; 1503 1504 if (!ieee80211_is_data_qos(hdr->frame_control)) 1505 return RX_CONTINUE; 1506 1507 /* remove the qos control field, update frame type and meta-data */ 1508 memmove(data + IEEE80211_QOS_CTL_LEN, data, 1509 ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN); 1510 hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN); 1511 /* change frame type to non QOS */ 1512 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 1513 1514 return RX_CONTINUE; 1515 } 1516 1517 static int 1518 ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) 1519 { 1520 if (unlikely(!rx->sta || 1521 !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED))) 1522 return -EACCES; 1523 1524 return 0; 1525 } 1526 1527 static int 1528 ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) 1529 { 1530 struct sk_buff *skb = rx->skb; 1531 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 1532 1533 /* 1534 * Pass through unencrypted frames if the hardware has 1535 * decrypted them already. 1536 */ 1537 if (status->flag & RX_FLAG_DECRYPTED) 1538 return 0; 1539 1540 /* Drop unencrypted frames if key is set. */ 1541 if (unlikely(!ieee80211_has_protected(fc) && 1542 !ieee80211_is_nullfunc(fc) && 1543 ieee80211_is_data(fc) && 1544 (rx->key || rx->sdata->drop_unencrypted))) 1545 return -EACCES; 1546 1547 return 0; 1548 } 1549 1550 static int 1551 ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx) 1552 { 1553 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 1554 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 1555 __le16 fc = hdr->frame_control; 1556 1557 /* 1558 * Pass through unencrypted frames if the hardware has 1559 * decrypted them already. 1560 */ 1561 if (status->flag & RX_FLAG_DECRYPTED) 1562 return 0; 1563 1564 if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) { 1565 if (unlikely(!ieee80211_has_protected(fc) && 1566 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) && 1567 rx->key)) { 1568 if (ieee80211_is_deauth(fc)) 1569 cfg80211_send_unprot_deauth(rx->sdata->dev, 1570 rx->skb->data, 1571 rx->skb->len); 1572 else if (ieee80211_is_disassoc(fc)) 1573 cfg80211_send_unprot_disassoc(rx->sdata->dev, 1574 rx->skb->data, 1575 rx->skb->len); 1576 return -EACCES; 1577 } 1578 /* BIP does not use Protected field, so need to check MMIE */ 1579 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) && 1580 ieee80211_get_mmie_keyidx(rx->skb) < 0)) { 1581 if (ieee80211_is_deauth(fc)) 1582 cfg80211_send_unprot_deauth(rx->sdata->dev, 1583 rx->skb->data, 1584 rx->skb->len); 1585 else if (ieee80211_is_disassoc(fc)) 1586 cfg80211_send_unprot_disassoc(rx->sdata->dev, 1587 rx->skb->data, 1588 rx->skb->len); 1589 return -EACCES; 1590 } 1591 /* 1592 * When using MFP, Action frames are not allowed prior to 1593 * having configured keys. 1594 */ 1595 if (unlikely(ieee80211_is_action(fc) && !rx->key && 1596 ieee80211_is_robust_mgmt_frame( 1597 (struct ieee80211_hdr *) rx->skb->data))) 1598 return -EACCES; 1599 } 1600 1601 return 0; 1602 } 1603 1604 static int 1605 __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control) 1606 { 1607 struct ieee80211_sub_if_data *sdata = rx->sdata; 1608 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 1609 bool check_port_control = false; 1610 struct ethhdr *ehdr; 1611 int ret; 1612 1613 *port_control = false; 1614 if (ieee80211_has_a4(hdr->frame_control) && 1615 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta) 1616 return -1; 1617 1618 if (sdata->vif.type == NL80211_IFTYPE_STATION && 1619 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) { 1620 1621 if (!sdata->u.mgd.use_4addr) 1622 return -1; 1623 else 1624 check_port_control = true; 1625 } 1626 1627 if (is_multicast_ether_addr(hdr->addr1) && 1628 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) 1629 return -1; 1630 1631 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type); 1632 if (ret < 0) 1633 return ret; 1634 1635 ehdr = (struct ethhdr *) rx->skb->data; 1636 if (ehdr->h_proto == rx->sdata->control_port_protocol) 1637 *port_control = true; 1638 else if (check_port_control) 1639 return -1; 1640 1641 return 0; 1642 } 1643 1644 /* 1645 * requires that rx->skb is a frame with ethernet header 1646 */ 1647 static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) 1648 { 1649 static const u8 pae_group_addr[ETH_ALEN] __aligned(2) 1650 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; 1651 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; 1652 1653 /* 1654 * Allow EAPOL frames to us/the PAE group address regardless 1655 * of whether the frame was encrypted or not. 1656 */ 1657 if (ehdr->h_proto == rx->sdata->control_port_protocol && 1658 (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 || 1659 compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) 1660 return true; 1661 1662 if (ieee80211_802_1x_port_control(rx) || 1663 ieee80211_drop_unencrypted(rx, fc)) 1664 return false; 1665 1666 return true; 1667 } 1668 1669 /* 1670 * requires that rx->skb is a frame with ethernet header 1671 */ 1672 static void 1673 ieee80211_deliver_skb(struct ieee80211_rx_data *rx) 1674 { 1675 struct ieee80211_sub_if_data *sdata = rx->sdata; 1676 struct net_device *dev = sdata->dev; 1677 struct sk_buff *skb, *xmit_skb; 1678 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; 1679 struct sta_info *dsta; 1680 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 1681 1682 skb = rx->skb; 1683 xmit_skb = NULL; 1684 1685 if ((sdata->vif.type == NL80211_IFTYPE_AP || 1686 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && 1687 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && 1688 (status->rx_flags & IEEE80211_RX_RA_MATCH) && 1689 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) { 1690 if (is_multicast_ether_addr(ehdr->h_dest)) { 1691 /* 1692 * send multicast frames both to higher layers in 1693 * local net stack and back to the wireless medium 1694 */ 1695 xmit_skb = skb_copy(skb, GFP_ATOMIC); 1696 if (!xmit_skb && net_ratelimit()) 1697 printk(KERN_DEBUG "%s: failed to clone " 1698 "multicast frame\n", dev->name); 1699 } else { 1700 dsta = sta_info_get(sdata, skb->data); 1701 if (dsta) { 1702 /* 1703 * The destination station is associated to 1704 * this AP (in this VLAN), so send the frame 1705 * directly to it and do not pass it to local 1706 * net stack. 1707 */ 1708 xmit_skb = skb; 1709 skb = NULL; 1710 } 1711 } 1712 } 1713 1714 if (skb) { 1715 int align __maybe_unused; 1716 1717 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 1718 /* 1719 * 'align' will only take the values 0 or 2 here 1720 * since all frames are required to be aligned 1721 * to 2-byte boundaries when being passed to 1722 * mac80211. That also explains the __skb_push() 1723 * below. 1724 */ 1725 align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3; 1726 if (align) { 1727 if (WARN_ON(skb_headroom(skb) < 3)) { 1728 dev_kfree_skb(skb); 1729 skb = NULL; 1730 } else { 1731 u8 *data = skb->data; 1732 size_t len = skb_headlen(skb); 1733 skb->data -= align; 1734 memmove(skb->data, data, len); 1735 skb_set_tail_pointer(skb, len); 1736 } 1737 } 1738 #endif 1739 1740 if (skb) { 1741 /* deliver to local stack */ 1742 skb->protocol = eth_type_trans(skb, dev); 1743 memset(skb->cb, 0, sizeof(skb->cb)); 1744 netif_receive_skb(skb); 1745 } 1746 } 1747 1748 if (xmit_skb) { 1749 /* send to wireless media */ 1750 xmit_skb->protocol = htons(ETH_P_802_3); 1751 skb_reset_network_header(xmit_skb); 1752 skb_reset_mac_header(xmit_skb); 1753 dev_queue_xmit(xmit_skb); 1754 } 1755 } 1756 1757 static ieee80211_rx_result debug_noinline 1758 ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) 1759 { 1760 struct net_device *dev = rx->sdata->dev; 1761 struct sk_buff *skb = rx->skb; 1762 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1763 __le16 fc = hdr->frame_control; 1764 struct sk_buff_head frame_list; 1765 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 1766 1767 if (unlikely(!ieee80211_is_data(fc))) 1768 return RX_CONTINUE; 1769 1770 if (unlikely(!ieee80211_is_data_present(fc))) 1771 return RX_DROP_MONITOR; 1772 1773 if (!(status->rx_flags & IEEE80211_RX_AMSDU)) 1774 return RX_CONTINUE; 1775 1776 if (ieee80211_has_a4(hdr->frame_control) && 1777 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 1778 !rx->sdata->u.vlan.sta) 1779 return RX_DROP_UNUSABLE; 1780 1781 if (is_multicast_ether_addr(hdr->addr1) && 1782 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 1783 rx->sdata->u.vlan.sta) || 1784 (rx->sdata->vif.type == NL80211_IFTYPE_STATION && 1785 rx->sdata->u.mgd.use_4addr))) 1786 return RX_DROP_UNUSABLE; 1787 1788 skb->dev = dev; 1789 __skb_queue_head_init(&frame_list); 1790 1791 if (skb_linearize(skb)) 1792 return RX_DROP_UNUSABLE; 1793 1794 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr, 1795 rx->sdata->vif.type, 1796 rx->local->hw.extra_tx_headroom, true); 1797 1798 while (!skb_queue_empty(&frame_list)) { 1799 rx->skb = __skb_dequeue(&frame_list); 1800 1801 if (!ieee80211_frame_allowed(rx, fc)) { 1802 dev_kfree_skb(rx->skb); 1803 continue; 1804 } 1805 dev->stats.rx_packets++; 1806 dev->stats.rx_bytes += rx->skb->len; 1807 1808 ieee80211_deliver_skb(rx); 1809 } 1810 1811 return RX_QUEUED; 1812 } 1813 1814 #ifdef CONFIG_MAC80211_MESH 1815 static ieee80211_rx_result 1816 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) 1817 { 1818 struct ieee80211_hdr *hdr; 1819 struct ieee80211s_hdr *mesh_hdr; 1820 unsigned int hdrlen; 1821 struct sk_buff *skb = rx->skb, *fwd_skb; 1822 struct ieee80211_local *local = rx->local; 1823 struct ieee80211_sub_if_data *sdata = rx->sdata; 1824 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 1825 1826 hdr = (struct ieee80211_hdr *) skb->data; 1827 hdrlen = ieee80211_hdrlen(hdr->frame_control); 1828 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); 1829 1830 if (!ieee80211_is_data(hdr->frame_control)) 1831 return RX_CONTINUE; 1832 1833 if (!mesh_hdr->ttl) 1834 /* illegal frame */ 1835 return RX_DROP_MONITOR; 1836 1837 if (mesh_hdr->flags & MESH_FLAGS_AE) { 1838 struct mesh_path *mppath; 1839 char *proxied_addr; 1840 char *mpp_addr; 1841 1842 if (is_multicast_ether_addr(hdr->addr1)) { 1843 mpp_addr = hdr->addr3; 1844 proxied_addr = mesh_hdr->eaddr1; 1845 } else { 1846 mpp_addr = hdr->addr4; 1847 proxied_addr = mesh_hdr->eaddr2; 1848 } 1849 1850 rcu_read_lock(); 1851 mppath = mpp_path_lookup(proxied_addr, sdata); 1852 if (!mppath) { 1853 mpp_path_add(proxied_addr, mpp_addr, sdata); 1854 } else { 1855 spin_lock_bh(&mppath->state_lock); 1856 if (compare_ether_addr(mppath->mpp, mpp_addr) != 0) 1857 memcpy(mppath->mpp, mpp_addr, ETH_ALEN); 1858 spin_unlock_bh(&mppath->state_lock); 1859 } 1860 rcu_read_unlock(); 1861 } 1862 1863 /* Frame has reached destination. Don't forward */ 1864 if (!is_multicast_ether_addr(hdr->addr1) && 1865 compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0) 1866 return RX_CONTINUE; 1867 1868 mesh_hdr->ttl--; 1869 1870 if (status->rx_flags & IEEE80211_RX_RA_MATCH) { 1871 if (!mesh_hdr->ttl) 1872 IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh, 1873 dropped_frames_ttl); 1874 else { 1875 struct ieee80211_hdr *fwd_hdr; 1876 struct ieee80211_tx_info *info; 1877 1878 fwd_skb = skb_copy(skb, GFP_ATOMIC); 1879 1880 if (!fwd_skb && net_ratelimit()) 1881 printk(KERN_DEBUG "%s: failed to clone mesh frame\n", 1882 sdata->name); 1883 if (!fwd_skb) 1884 goto out; 1885 1886 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; 1887 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN); 1888 info = IEEE80211_SKB_CB(fwd_skb); 1889 memset(info, 0, sizeof(*info)); 1890 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1891 info->control.vif = &rx->sdata->vif; 1892 skb_set_queue_mapping(skb, 1893 ieee80211_select_queue(rx->sdata, fwd_skb)); 1894 ieee80211_set_qos_hdr(local, skb); 1895 if (is_multicast_ether_addr(fwd_hdr->addr1)) 1896 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, 1897 fwded_mcast); 1898 else { 1899 int err; 1900 /* 1901 * Save TA to addr1 to send TA a path error if a 1902 * suitable next hop is not found 1903 */ 1904 memcpy(fwd_hdr->addr1, fwd_hdr->addr2, 1905 ETH_ALEN); 1906 err = mesh_nexthop_lookup(fwd_skb, sdata); 1907 /* Failed to immediately resolve next hop: 1908 * fwded frame was dropped or will be added 1909 * later to the pending skb queue. */ 1910 if (err) 1911 return RX_DROP_MONITOR; 1912 1913 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, 1914 fwded_unicast); 1915 } 1916 IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, 1917 fwded_frames); 1918 ieee80211_add_pending_skb(local, fwd_skb); 1919 } 1920 } 1921 1922 out: 1923 if (is_multicast_ether_addr(hdr->addr1) || 1924 sdata->dev->flags & IFF_PROMISC) 1925 return RX_CONTINUE; 1926 else 1927 return RX_DROP_MONITOR; 1928 } 1929 #endif 1930 1931 static ieee80211_rx_result debug_noinline 1932 ieee80211_rx_h_data(struct ieee80211_rx_data *rx) 1933 { 1934 struct ieee80211_sub_if_data *sdata = rx->sdata; 1935 struct ieee80211_local *local = rx->local; 1936 struct net_device *dev = sdata->dev; 1937 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 1938 __le16 fc = hdr->frame_control; 1939 bool port_control; 1940 int err; 1941 1942 if (unlikely(!ieee80211_is_data(hdr->frame_control))) 1943 return RX_CONTINUE; 1944 1945 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) 1946 return RX_DROP_MONITOR; 1947 1948 /* 1949 * Allow the cooked monitor interface of an AP to see 4-addr frames so 1950 * that a 4-addr station can be detected and moved into a separate VLAN 1951 */ 1952 if (ieee80211_has_a4(hdr->frame_control) && 1953 sdata->vif.type == NL80211_IFTYPE_AP) 1954 return RX_DROP_MONITOR; 1955 1956 err = __ieee80211_data_to_8023(rx, &port_control); 1957 if (unlikely(err)) 1958 return RX_DROP_UNUSABLE; 1959 1960 if (!ieee80211_frame_allowed(rx, fc)) 1961 return RX_DROP_MONITOR; 1962 1963 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 1964 unlikely(port_control) && sdata->bss) { 1965 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 1966 u.ap); 1967 dev = sdata->dev; 1968 rx->sdata = sdata; 1969 } 1970 1971 rx->skb->dev = dev; 1972 1973 dev->stats.rx_packets++; 1974 dev->stats.rx_bytes += rx->skb->len; 1975 1976 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 && 1977 !is_multicast_ether_addr( 1978 ((struct ethhdr *)rx->skb->data)->h_dest) && 1979 (!local->scanning && 1980 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) { 1981 mod_timer(&local->dynamic_ps_timer, jiffies + 1982 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 1983 } 1984 1985 ieee80211_deliver_skb(rx); 1986 1987 return RX_QUEUED; 1988 } 1989 1990 static ieee80211_rx_result debug_noinline 1991 ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx) 1992 { 1993 struct ieee80211_local *local = rx->local; 1994 struct ieee80211_hw *hw = &local->hw; 1995 struct sk_buff *skb = rx->skb; 1996 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; 1997 struct tid_ampdu_rx *tid_agg_rx; 1998 u16 start_seq_num; 1999 u16 tid; 2000 2001 if (likely(!ieee80211_is_ctl(bar->frame_control))) 2002 return RX_CONTINUE; 2003 2004 if (ieee80211_is_back_req(bar->frame_control)) { 2005 struct { 2006 __le16 control, start_seq_num; 2007 } __packed bar_data; 2008 2009 if (!rx->sta) 2010 return RX_DROP_MONITOR; 2011 2012 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control), 2013 &bar_data, sizeof(bar_data))) 2014 return RX_DROP_MONITOR; 2015 2016 tid = le16_to_cpu(bar_data.control) >> 12; 2017 2018 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]); 2019 if (!tid_agg_rx) 2020 return RX_DROP_MONITOR; 2021 2022 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4; 2023 2024 /* reset session timer */ 2025 if (tid_agg_rx->timeout) 2026 mod_timer(&tid_agg_rx->session_timer, 2027 TU_TO_EXP_TIME(tid_agg_rx->timeout)); 2028 2029 spin_lock(&tid_agg_rx->reorder_lock); 2030 /* release stored frames up to start of BAR */ 2031 ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num); 2032 spin_unlock(&tid_agg_rx->reorder_lock); 2033 2034 kfree_skb(skb); 2035 return RX_QUEUED; 2036 } 2037 2038 /* 2039 * After this point, we only want management frames, 2040 * so we can drop all remaining control frames to 2041 * cooked monitor interfaces. 2042 */ 2043 return RX_DROP_MONITOR; 2044 } 2045 2046 static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, 2047 struct ieee80211_mgmt *mgmt, 2048 size_t len) 2049 { 2050 struct ieee80211_local *local = sdata->local; 2051 struct sk_buff *skb; 2052 struct ieee80211_mgmt *resp; 2053 2054 if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) { 2055 /* Not to own unicast address */ 2056 return; 2057 } 2058 2059 if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 || 2060 compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) { 2061 /* Not from the current AP or not associated yet. */ 2062 return; 2063 } 2064 2065 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) { 2066 /* Too short SA Query request frame */ 2067 return; 2068 } 2069 2070 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); 2071 if (skb == NULL) 2072 return; 2073 2074 skb_reserve(skb, local->hw.extra_tx_headroom); 2075 resp = (struct ieee80211_mgmt *) skb_put(skb, 24); 2076 memset(resp, 0, 24); 2077 memcpy(resp->da, mgmt->sa, ETH_ALEN); 2078 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN); 2079 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN); 2080 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2081 IEEE80211_STYPE_ACTION); 2082 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query)); 2083 resp->u.action.category = WLAN_CATEGORY_SA_QUERY; 2084 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE; 2085 memcpy(resp->u.action.u.sa_query.trans_id, 2086 mgmt->u.action.u.sa_query.trans_id, 2087 WLAN_SA_QUERY_TR_ID_LEN); 2088 2089 ieee80211_tx_skb(sdata, skb); 2090 } 2091 2092 static ieee80211_rx_result debug_noinline 2093 ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx) 2094 { 2095 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 2096 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 2097 2098 /* 2099 * From here on, look only at management frames. 2100 * Data and control frames are already handled, 2101 * and unknown (reserved) frames are useless. 2102 */ 2103 if (rx->skb->len < 24) 2104 return RX_DROP_MONITOR; 2105 2106 if (!ieee80211_is_mgmt(mgmt->frame_control)) 2107 return RX_DROP_MONITOR; 2108 2109 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) 2110 return RX_DROP_MONITOR; 2111 2112 if (ieee80211_drop_unencrypted_mgmt(rx)) 2113 return RX_DROP_UNUSABLE; 2114 2115 return RX_CONTINUE; 2116 } 2117 2118 static ieee80211_rx_result debug_noinline 2119 ieee80211_rx_h_action(struct ieee80211_rx_data *rx) 2120 { 2121 struct ieee80211_local *local = rx->local; 2122 struct ieee80211_sub_if_data *sdata = rx->sdata; 2123 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 2124 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 2125 int len = rx->skb->len; 2126 2127 if (!ieee80211_is_action(mgmt->frame_control)) 2128 return RX_CONTINUE; 2129 2130 /* drop too small frames */ 2131 if (len < IEEE80211_MIN_ACTION_SIZE) 2132 return RX_DROP_UNUSABLE; 2133 2134 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC) 2135 return RX_DROP_UNUSABLE; 2136 2137 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) 2138 return RX_DROP_UNUSABLE; 2139 2140 switch (mgmt->u.action.category) { 2141 case WLAN_CATEGORY_BACK: 2142 /* 2143 * The aggregation code is not prepared to handle 2144 * anything but STA/AP due to the BSSID handling; 2145 * IBSS could work in the code but isn't supported 2146 * by drivers or the standard. 2147 */ 2148 if (sdata->vif.type != NL80211_IFTYPE_STATION && 2149 sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 2150 sdata->vif.type != NL80211_IFTYPE_AP) 2151 break; 2152 2153 /* verify action_code is present */ 2154 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 2155 break; 2156 2157 switch (mgmt->u.action.u.addba_req.action_code) { 2158 case WLAN_ACTION_ADDBA_REQ: 2159 if (len < (IEEE80211_MIN_ACTION_SIZE + 2160 sizeof(mgmt->u.action.u.addba_req))) 2161 goto invalid; 2162 break; 2163 case WLAN_ACTION_ADDBA_RESP: 2164 if (len < (IEEE80211_MIN_ACTION_SIZE + 2165 sizeof(mgmt->u.action.u.addba_resp))) 2166 goto invalid; 2167 break; 2168 case WLAN_ACTION_DELBA: 2169 if (len < (IEEE80211_MIN_ACTION_SIZE + 2170 sizeof(mgmt->u.action.u.delba))) 2171 goto invalid; 2172 break; 2173 default: 2174 goto invalid; 2175 } 2176 2177 goto queue; 2178 case WLAN_CATEGORY_SPECTRUM_MGMT: 2179 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ) 2180 break; 2181 2182 if (sdata->vif.type != NL80211_IFTYPE_STATION) 2183 break; 2184 2185 /* verify action_code is present */ 2186 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 2187 break; 2188 2189 switch (mgmt->u.action.u.measurement.action_code) { 2190 case WLAN_ACTION_SPCT_MSR_REQ: 2191 if (len < (IEEE80211_MIN_ACTION_SIZE + 2192 sizeof(mgmt->u.action.u.measurement))) 2193 break; 2194 ieee80211_process_measurement_req(sdata, mgmt, len); 2195 goto handled; 2196 case WLAN_ACTION_SPCT_CHL_SWITCH: 2197 if (len < (IEEE80211_MIN_ACTION_SIZE + 2198 sizeof(mgmt->u.action.u.chan_switch))) 2199 break; 2200 2201 if (sdata->vif.type != NL80211_IFTYPE_STATION) 2202 break; 2203 2204 if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN)) 2205 break; 2206 2207 goto queue; 2208 } 2209 break; 2210 case WLAN_CATEGORY_SA_QUERY: 2211 if (len < (IEEE80211_MIN_ACTION_SIZE + 2212 sizeof(mgmt->u.action.u.sa_query))) 2213 break; 2214 2215 switch (mgmt->u.action.u.sa_query.action) { 2216 case WLAN_ACTION_SA_QUERY_REQUEST: 2217 if (sdata->vif.type != NL80211_IFTYPE_STATION) 2218 break; 2219 ieee80211_process_sa_query_req(sdata, mgmt, len); 2220 goto handled; 2221 } 2222 break; 2223 case WLAN_CATEGORY_MESH_ACTION: 2224 if (!ieee80211_vif_is_mesh(&sdata->vif)) 2225 break; 2226 goto queue; 2227 case WLAN_CATEGORY_MESH_PATH_SEL: 2228 if (!mesh_path_sel_is_hwmp(sdata)) 2229 break; 2230 goto queue; 2231 } 2232 2233 return RX_CONTINUE; 2234 2235 invalid: 2236 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM; 2237 /* will return in the next handlers */ 2238 return RX_CONTINUE; 2239 2240 handled: 2241 if (rx->sta) 2242 rx->sta->rx_packets++; 2243 dev_kfree_skb(rx->skb); 2244 return RX_QUEUED; 2245 2246 queue: 2247 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; 2248 skb_queue_tail(&sdata->skb_queue, rx->skb); 2249 ieee80211_queue_work(&local->hw, &sdata->work); 2250 if (rx->sta) 2251 rx->sta->rx_packets++; 2252 return RX_QUEUED; 2253 } 2254 2255 static ieee80211_rx_result debug_noinline 2256 ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx) 2257 { 2258 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 2259 2260 /* skip known-bad action frames and return them in the next handler */ 2261 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) 2262 return RX_CONTINUE; 2263 2264 /* 2265 * Getting here means the kernel doesn't know how to handle 2266 * it, but maybe userspace does ... include returned frames 2267 * so userspace can register for those to know whether ones 2268 * it transmitted were processed or returned. 2269 */ 2270 2271 if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq, 2272 rx->skb->data, rx->skb->len, 2273 GFP_ATOMIC)) { 2274 if (rx->sta) 2275 rx->sta->rx_packets++; 2276 dev_kfree_skb(rx->skb); 2277 return RX_QUEUED; 2278 } 2279 2280 2281 return RX_CONTINUE; 2282 } 2283 2284 static ieee80211_rx_result debug_noinline 2285 ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx) 2286 { 2287 struct ieee80211_local *local = rx->local; 2288 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; 2289 struct sk_buff *nskb; 2290 struct ieee80211_sub_if_data *sdata = rx->sdata; 2291 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 2292 2293 if (!ieee80211_is_action(mgmt->frame_control)) 2294 return RX_CONTINUE; 2295 2296 /* 2297 * For AP mode, hostapd is responsible for handling any action 2298 * frames that we didn't handle, including returning unknown 2299 * ones. For all other modes we will return them to the sender, 2300 * setting the 0x80 bit in the action category, as required by 2301 * 802.11-2007 7.3.1.11. 2302 * Newer versions of hostapd shall also use the management frame 2303 * registration mechanisms, but older ones still use cooked 2304 * monitor interfaces so push all frames there. 2305 */ 2306 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) && 2307 (sdata->vif.type == NL80211_IFTYPE_AP || 2308 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) 2309 return RX_DROP_MONITOR; 2310 2311 /* do not return rejected action frames */ 2312 if (mgmt->u.action.category & 0x80) 2313 return RX_DROP_UNUSABLE; 2314 2315 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0, 2316 GFP_ATOMIC); 2317 if (nskb) { 2318 struct ieee80211_mgmt *nmgmt = (void *)nskb->data; 2319 2320 nmgmt->u.action.category |= 0x80; 2321 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN); 2322 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN); 2323 2324 memset(nskb->cb, 0, sizeof(nskb->cb)); 2325 2326 ieee80211_tx_skb(rx->sdata, nskb); 2327 } 2328 dev_kfree_skb(rx->skb); 2329 return RX_QUEUED; 2330 } 2331 2332 static ieee80211_rx_result debug_noinline 2333 ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) 2334 { 2335 struct ieee80211_sub_if_data *sdata = rx->sdata; 2336 ieee80211_rx_result rxs; 2337 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data; 2338 __le16 stype; 2339 2340 rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb); 2341 if (rxs != RX_CONTINUE) 2342 return rxs; 2343 2344 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE); 2345 2346 if (!ieee80211_vif_is_mesh(&sdata->vif) && 2347 sdata->vif.type != NL80211_IFTYPE_ADHOC && 2348 sdata->vif.type != NL80211_IFTYPE_STATION) 2349 return RX_DROP_MONITOR; 2350 2351 switch (stype) { 2352 case cpu_to_le16(IEEE80211_STYPE_BEACON): 2353 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP): 2354 /* process for all: mesh, mlme, ibss */ 2355 break; 2356 case cpu_to_le16(IEEE80211_STYPE_DEAUTH): 2357 case cpu_to_le16(IEEE80211_STYPE_DISASSOC): 2358 if (is_multicast_ether_addr(mgmt->da) && 2359 !is_broadcast_ether_addr(mgmt->da)) 2360 return RX_DROP_MONITOR; 2361 2362 /* process only for station */ 2363 if (sdata->vif.type != NL80211_IFTYPE_STATION) 2364 return RX_DROP_MONITOR; 2365 break; 2366 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ): 2367 case cpu_to_le16(IEEE80211_STYPE_AUTH): 2368 /* process only for ibss */ 2369 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 2370 return RX_DROP_MONITOR; 2371 break; 2372 default: 2373 return RX_DROP_MONITOR; 2374 } 2375 2376 /* queue up frame and kick off work to process it */ 2377 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; 2378 skb_queue_tail(&sdata->skb_queue, rx->skb); 2379 ieee80211_queue_work(&rx->local->hw, &sdata->work); 2380 if (rx->sta) 2381 rx->sta->rx_packets++; 2382 2383 return RX_QUEUED; 2384 } 2385 2386 /* TODO: use IEEE80211_RX_FRAGMENTED */ 2387 static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx, 2388 struct ieee80211_rate *rate) 2389 { 2390 struct ieee80211_sub_if_data *sdata; 2391 struct ieee80211_local *local = rx->local; 2392 struct ieee80211_rtap_hdr { 2393 struct ieee80211_radiotap_header hdr; 2394 u8 flags; 2395 u8 rate_or_pad; 2396 __le16 chan_freq; 2397 __le16 chan_flags; 2398 } __packed *rthdr; 2399 struct sk_buff *skb = rx->skb, *skb2; 2400 struct net_device *prev_dev = NULL; 2401 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 2402 2403 /* 2404 * If cooked monitor has been processed already, then 2405 * don't do it again. If not, set the flag. 2406 */ 2407 if (rx->flags & IEEE80211_RX_CMNTR) 2408 goto out_free_skb; 2409 rx->flags |= IEEE80211_RX_CMNTR; 2410 2411 if (skb_headroom(skb) < sizeof(*rthdr) && 2412 pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) 2413 goto out_free_skb; 2414 2415 rthdr = (void *)skb_push(skb, sizeof(*rthdr)); 2416 memset(rthdr, 0, sizeof(*rthdr)); 2417 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); 2418 rthdr->hdr.it_present = 2419 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | 2420 (1 << IEEE80211_RADIOTAP_CHANNEL)); 2421 2422 if (rate) { 2423 rthdr->rate_or_pad = rate->bitrate / 5; 2424 rthdr->hdr.it_present |= 2425 cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); 2426 } 2427 rthdr->chan_freq = cpu_to_le16(status->freq); 2428 2429 if (status->band == IEEE80211_BAND_5GHZ) 2430 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM | 2431 IEEE80211_CHAN_5GHZ); 2432 else 2433 rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN | 2434 IEEE80211_CHAN_2GHZ); 2435 2436 skb_set_mac_header(skb, 0); 2437 skb->ip_summed = CHECKSUM_UNNECESSARY; 2438 skb->pkt_type = PACKET_OTHERHOST; 2439 skb->protocol = htons(ETH_P_802_2); 2440 2441 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 2442 if (!ieee80211_sdata_running(sdata)) 2443 continue; 2444 2445 if (sdata->vif.type != NL80211_IFTYPE_MONITOR || 2446 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) 2447 continue; 2448 2449 if (prev_dev) { 2450 skb2 = skb_clone(skb, GFP_ATOMIC); 2451 if (skb2) { 2452 skb2->dev = prev_dev; 2453 netif_receive_skb(skb2); 2454 } 2455 } 2456 2457 prev_dev = sdata->dev; 2458 sdata->dev->stats.rx_packets++; 2459 sdata->dev->stats.rx_bytes += skb->len; 2460 } 2461 2462 if (prev_dev) { 2463 skb->dev = prev_dev; 2464 netif_receive_skb(skb); 2465 return; 2466 } 2467 2468 out_free_skb: 2469 dev_kfree_skb(skb); 2470 } 2471 2472 static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx, 2473 ieee80211_rx_result res) 2474 { 2475 switch (res) { 2476 case RX_DROP_MONITOR: 2477 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); 2478 if (rx->sta) 2479 rx->sta->rx_dropped++; 2480 /* fall through */ 2481 case RX_CONTINUE: { 2482 struct ieee80211_rate *rate = NULL; 2483 struct ieee80211_supported_band *sband; 2484 struct ieee80211_rx_status *status; 2485 2486 status = IEEE80211_SKB_RXCB((rx->skb)); 2487 2488 sband = rx->local->hw.wiphy->bands[status->band]; 2489 if (!(status->flag & RX_FLAG_HT)) 2490 rate = &sband->bitrates[status->rate_idx]; 2491 2492 ieee80211_rx_cooked_monitor(rx, rate); 2493 break; 2494 } 2495 case RX_DROP_UNUSABLE: 2496 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); 2497 if (rx->sta) 2498 rx->sta->rx_dropped++; 2499 dev_kfree_skb(rx->skb); 2500 break; 2501 case RX_QUEUED: 2502 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued); 2503 break; 2504 } 2505 } 2506 2507 static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx) 2508 { 2509 ieee80211_rx_result res = RX_DROP_MONITOR; 2510 struct sk_buff *skb; 2511 2512 #define CALL_RXH(rxh) \ 2513 do { \ 2514 res = rxh(rx); \ 2515 if (res != RX_CONTINUE) \ 2516 goto rxh_next; \ 2517 } while (0); 2518 2519 spin_lock(&rx->local->rx_skb_queue.lock); 2520 if (rx->local->running_rx_handler) 2521 goto unlock; 2522 2523 rx->local->running_rx_handler = true; 2524 2525 while ((skb = __skb_dequeue(&rx->local->rx_skb_queue))) { 2526 spin_unlock(&rx->local->rx_skb_queue.lock); 2527 2528 /* 2529 * all the other fields are valid across frames 2530 * that belong to an aMPDU since they are on the 2531 * same TID from the same station 2532 */ 2533 rx->skb = skb; 2534 2535 CALL_RXH(ieee80211_rx_h_decrypt) 2536 CALL_RXH(ieee80211_rx_h_check_more_data) 2537 CALL_RXH(ieee80211_rx_h_sta_process) 2538 CALL_RXH(ieee80211_rx_h_defragment) 2539 CALL_RXH(ieee80211_rx_h_ps_poll) 2540 CALL_RXH(ieee80211_rx_h_michael_mic_verify) 2541 /* must be after MMIC verify so header is counted in MPDU mic */ 2542 CALL_RXH(ieee80211_rx_h_remove_qos_control) 2543 CALL_RXH(ieee80211_rx_h_amsdu) 2544 #ifdef CONFIG_MAC80211_MESH 2545 if (ieee80211_vif_is_mesh(&rx->sdata->vif)) 2546 CALL_RXH(ieee80211_rx_h_mesh_fwding); 2547 #endif 2548 CALL_RXH(ieee80211_rx_h_data) 2549 CALL_RXH(ieee80211_rx_h_ctrl); 2550 CALL_RXH(ieee80211_rx_h_mgmt_check) 2551 CALL_RXH(ieee80211_rx_h_action) 2552 CALL_RXH(ieee80211_rx_h_userspace_mgmt) 2553 CALL_RXH(ieee80211_rx_h_action_return) 2554 CALL_RXH(ieee80211_rx_h_mgmt) 2555 2556 rxh_next: 2557 ieee80211_rx_handlers_result(rx, res); 2558 spin_lock(&rx->local->rx_skb_queue.lock); 2559 #undef CALL_RXH 2560 } 2561 2562 rx->local->running_rx_handler = false; 2563 2564 unlock: 2565 spin_unlock(&rx->local->rx_skb_queue.lock); 2566 } 2567 2568 static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx) 2569 { 2570 ieee80211_rx_result res = RX_DROP_MONITOR; 2571 2572 #define CALL_RXH(rxh) \ 2573 do { \ 2574 res = rxh(rx); \ 2575 if (res != RX_CONTINUE) \ 2576 goto rxh_next; \ 2577 } while (0); 2578 2579 CALL_RXH(ieee80211_rx_h_passive_scan) 2580 CALL_RXH(ieee80211_rx_h_check) 2581 2582 ieee80211_rx_reorder_ampdu(rx); 2583 2584 ieee80211_rx_handlers(rx); 2585 return; 2586 2587 rxh_next: 2588 ieee80211_rx_handlers_result(rx, res); 2589 2590 #undef CALL_RXH 2591 } 2592 2593 /* 2594 * This function makes calls into the RX path, therefore 2595 * it has to be invoked under RCU read lock. 2596 */ 2597 void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid) 2598 { 2599 struct ieee80211_rx_data rx = { 2600 .sta = sta, 2601 .sdata = sta->sdata, 2602 .local = sta->local, 2603 /* This is OK -- must be QoS data frame */ 2604 .security_idx = tid, 2605 .seqno_idx = tid, 2606 .flags = 0, 2607 }; 2608 struct tid_ampdu_rx *tid_agg_rx; 2609 2610 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); 2611 if (!tid_agg_rx) 2612 return; 2613 2614 spin_lock(&tid_agg_rx->reorder_lock); 2615 ieee80211_sta_reorder_release(&sta->local->hw, tid_agg_rx); 2616 spin_unlock(&tid_agg_rx->reorder_lock); 2617 2618 ieee80211_rx_handlers(&rx); 2619 } 2620 2621 /* main receive path */ 2622 2623 static int prepare_for_handlers(struct ieee80211_rx_data *rx, 2624 struct ieee80211_hdr *hdr) 2625 { 2626 struct ieee80211_sub_if_data *sdata = rx->sdata; 2627 struct sk_buff *skb = rx->skb; 2628 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 2629 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); 2630 int multicast = is_multicast_ether_addr(hdr->addr1); 2631 2632 switch (sdata->vif.type) { 2633 case NL80211_IFTYPE_STATION: 2634 if (!bssid && !sdata->u.mgd.use_4addr) 2635 return 0; 2636 if (!multicast && 2637 compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) { 2638 if (!(sdata->dev->flags & IFF_PROMISC) || 2639 sdata->u.mgd.use_4addr) 2640 return 0; 2641 status->rx_flags &= ~IEEE80211_RX_RA_MATCH; 2642 } 2643 break; 2644 case NL80211_IFTYPE_ADHOC: 2645 if (!bssid) 2646 return 0; 2647 if (ieee80211_is_beacon(hdr->frame_control)) { 2648 return 1; 2649 } 2650 else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) { 2651 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN)) 2652 return 0; 2653 status->rx_flags &= ~IEEE80211_RX_RA_MATCH; 2654 } else if (!multicast && 2655 compare_ether_addr(sdata->vif.addr, 2656 hdr->addr1) != 0) { 2657 if (!(sdata->dev->flags & IFF_PROMISC)) 2658 return 0; 2659 status->rx_flags &= ~IEEE80211_RX_RA_MATCH; 2660 } else if (!rx->sta) { 2661 int rate_idx; 2662 if (status->flag & RX_FLAG_HT) 2663 rate_idx = 0; /* TODO: HT rates */ 2664 else 2665 rate_idx = status->rate_idx; 2666 rx->sta = ieee80211_ibss_add_sta(sdata, bssid, 2667 hdr->addr2, BIT(rate_idx), GFP_ATOMIC); 2668 } 2669 break; 2670 case NL80211_IFTYPE_MESH_POINT: 2671 if (!multicast && 2672 compare_ether_addr(sdata->vif.addr, 2673 hdr->addr1) != 0) { 2674 if (!(sdata->dev->flags & IFF_PROMISC)) 2675 return 0; 2676 2677 status->rx_flags &= ~IEEE80211_RX_RA_MATCH; 2678 } 2679 break; 2680 case NL80211_IFTYPE_AP_VLAN: 2681 case NL80211_IFTYPE_AP: 2682 if (!bssid) { 2683 if (compare_ether_addr(sdata->vif.addr, 2684 hdr->addr1)) 2685 return 0; 2686 } else if (!ieee80211_bssid_match(bssid, 2687 sdata->vif.addr)) { 2688 if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) && 2689 !ieee80211_is_beacon(hdr->frame_control)) 2690 return 0; 2691 status->rx_flags &= ~IEEE80211_RX_RA_MATCH; 2692 } 2693 break; 2694 case NL80211_IFTYPE_WDS: 2695 if (bssid || !ieee80211_is_data(hdr->frame_control)) 2696 return 0; 2697 if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) 2698 return 0; 2699 break; 2700 default: 2701 /* should never get here */ 2702 WARN_ON(1); 2703 break; 2704 } 2705 2706 return 1; 2707 } 2708 2709 /* 2710 * This function returns whether or not the SKB 2711 * was destined for RX processing or not, which, 2712 * if consume is true, is equivalent to whether 2713 * or not the skb was consumed. 2714 */ 2715 static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx, 2716 struct sk_buff *skb, bool consume) 2717 { 2718 struct ieee80211_local *local = rx->local; 2719 struct ieee80211_sub_if_data *sdata = rx->sdata; 2720 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 2721 struct ieee80211_hdr *hdr = (void *)skb->data; 2722 int prepares; 2723 2724 rx->skb = skb; 2725 status->rx_flags |= IEEE80211_RX_RA_MATCH; 2726 prepares = prepare_for_handlers(rx, hdr); 2727 2728 if (!prepares) 2729 return false; 2730 2731 if (!consume) { 2732 skb = skb_copy(skb, GFP_ATOMIC); 2733 if (!skb) { 2734 if (net_ratelimit()) 2735 wiphy_debug(local->hw.wiphy, 2736 "failed to copy skb for %s\n", 2737 sdata->name); 2738 return true; 2739 } 2740 2741 rx->skb = skb; 2742 } 2743 2744 ieee80211_invoke_rx_handlers(rx); 2745 return true; 2746 } 2747 2748 /* 2749 * This is the actual Rx frames handler. as it blongs to Rx path it must 2750 * be called with rcu_read_lock protection. 2751 */ 2752 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, 2753 struct sk_buff *skb) 2754 { 2755 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 2756 struct ieee80211_local *local = hw_to_local(hw); 2757 struct ieee80211_sub_if_data *sdata; 2758 struct ieee80211_hdr *hdr; 2759 __le16 fc; 2760 struct ieee80211_rx_data rx; 2761 struct ieee80211_sub_if_data *prev; 2762 struct sta_info *sta, *tmp, *prev_sta; 2763 int err = 0; 2764 2765 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 2766 memset(&rx, 0, sizeof(rx)); 2767 rx.skb = skb; 2768 rx.local = local; 2769 2770 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc)) 2771 local->dot11ReceivedFragmentCount++; 2772 2773 if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) || 2774 test_bit(SCAN_SW_SCANNING, &local->scanning))) 2775 status->rx_flags |= IEEE80211_RX_IN_SCAN; 2776 2777 if (ieee80211_is_mgmt(fc)) 2778 err = skb_linearize(skb); 2779 else 2780 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc)); 2781 2782 if (err) { 2783 dev_kfree_skb(skb); 2784 return; 2785 } 2786 2787 hdr = (struct ieee80211_hdr *)skb->data; 2788 ieee80211_parse_qos(&rx); 2789 ieee80211_verify_alignment(&rx); 2790 2791 if (ieee80211_is_data(fc)) { 2792 prev_sta = NULL; 2793 2794 for_each_sta_info(local, hdr->addr2, sta, tmp) { 2795 if (!prev_sta) { 2796 prev_sta = sta; 2797 continue; 2798 } 2799 2800 rx.sta = prev_sta; 2801 rx.sdata = prev_sta->sdata; 2802 ieee80211_prepare_and_rx_handle(&rx, skb, false); 2803 2804 prev_sta = sta; 2805 } 2806 2807 if (prev_sta) { 2808 rx.sta = prev_sta; 2809 rx.sdata = prev_sta->sdata; 2810 2811 if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) 2812 return; 2813 goto out; 2814 } 2815 } 2816 2817 prev = NULL; 2818 2819 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 2820 if (!ieee80211_sdata_running(sdata)) 2821 continue; 2822 2823 if (sdata->vif.type == NL80211_IFTYPE_MONITOR || 2824 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2825 continue; 2826 2827 /* 2828 * frame is destined for this interface, but if it's 2829 * not also for the previous one we handle that after 2830 * the loop to avoid copying the SKB once too much 2831 */ 2832 2833 if (!prev) { 2834 prev = sdata; 2835 continue; 2836 } 2837 2838 rx.sta = sta_info_get_bss(prev, hdr->addr2); 2839 rx.sdata = prev; 2840 ieee80211_prepare_and_rx_handle(&rx, skb, false); 2841 2842 prev = sdata; 2843 } 2844 2845 if (prev) { 2846 rx.sta = sta_info_get_bss(prev, hdr->addr2); 2847 rx.sdata = prev; 2848 2849 if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) 2850 return; 2851 } 2852 2853 out: 2854 dev_kfree_skb(skb); 2855 } 2856 2857 /* 2858 * This is the receive path handler. It is called by a low level driver when an 2859 * 802.11 MPDU is received from the hardware. 2860 */ 2861 void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb) 2862 { 2863 struct ieee80211_local *local = hw_to_local(hw); 2864 struct ieee80211_rate *rate = NULL; 2865 struct ieee80211_supported_band *sband; 2866 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 2867 2868 WARN_ON_ONCE(softirq_count() == 0); 2869 2870 if (WARN_ON(status->band < 0 || 2871 status->band >= IEEE80211_NUM_BANDS)) 2872 goto drop; 2873 2874 sband = local->hw.wiphy->bands[status->band]; 2875 if (WARN_ON(!sband)) 2876 goto drop; 2877 2878 /* 2879 * If we're suspending, it is possible although not too likely 2880 * that we'd be receiving frames after having already partially 2881 * quiesced the stack. We can't process such frames then since 2882 * that might, for example, cause stations to be added or other 2883 * driver callbacks be invoked. 2884 */ 2885 if (unlikely(local->quiescing || local->suspended)) 2886 goto drop; 2887 2888 /* 2889 * The same happens when we're not even started, 2890 * but that's worth a warning. 2891 */ 2892 if (WARN_ON(!local->started)) 2893 goto drop; 2894 2895 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) { 2896 /* 2897 * Validate the rate, unless a PLCP error means that 2898 * we probably can't have a valid rate here anyway. 2899 */ 2900 2901 if (status->flag & RX_FLAG_HT) { 2902 /* 2903 * rate_idx is MCS index, which can be [0-76] 2904 * as documented on: 2905 * 2906 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n 2907 * 2908 * Anything else would be some sort of driver or 2909 * hardware error. The driver should catch hardware 2910 * errors. 2911 */ 2912 if (WARN((status->rate_idx < 0 || 2913 status->rate_idx > 76), 2914 "Rate marked as an HT rate but passed " 2915 "status->rate_idx is not " 2916 "an MCS index [0-76]: %d (0x%02x)\n", 2917 status->rate_idx, 2918 status->rate_idx)) 2919 goto drop; 2920 } else { 2921 if (WARN_ON(status->rate_idx < 0 || 2922 status->rate_idx >= sband->n_bitrates)) 2923 goto drop; 2924 rate = &sband->bitrates[status->rate_idx]; 2925 } 2926 } 2927 2928 status->rx_flags = 0; 2929 2930 /* 2931 * key references and virtual interfaces are protected using RCU 2932 * and this requires that we are in a read-side RCU section during 2933 * receive processing 2934 */ 2935 rcu_read_lock(); 2936 2937 /* 2938 * Frames with failed FCS/PLCP checksum are not returned, 2939 * all other frames are returned without radiotap header 2940 * if it was previously present. 2941 * Also, frames with less than 16 bytes are dropped. 2942 */ 2943 skb = ieee80211_rx_monitor(local, skb, rate); 2944 if (!skb) { 2945 rcu_read_unlock(); 2946 return; 2947 } 2948 2949 ieee80211_tpt_led_trig_rx(local, 2950 ((struct ieee80211_hdr *)skb->data)->frame_control, 2951 skb->len); 2952 __ieee80211_rx_handle_packet(hw, skb); 2953 2954 rcu_read_unlock(); 2955 2956 return; 2957 drop: 2958 kfree_skb(skb); 2959 } 2960 EXPORT_SYMBOL(ieee80211_rx); 2961 2962 /* This is a version of the rx handler that can be called from hard irq 2963 * context. Post the skb on the queue and schedule the tasklet */ 2964 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb) 2965 { 2966 struct ieee80211_local *local = hw_to_local(hw); 2967 2968 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); 2969 2970 skb->pkt_type = IEEE80211_RX_MSG; 2971 skb_queue_tail(&local->skb_queue, skb); 2972 tasklet_schedule(&local->tasklet); 2973 } 2974 EXPORT_SYMBOL(ieee80211_rx_irqsafe); 2975