1 /****************************************************************************** 2 * 3 * This file is provided under a dual BSD/GPLv2 license. When using or 4 * redistributing this file, you may do so under either license. 5 * 6 * GPL LICENSE SUMMARY 7 * 8 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved. 9 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH 10 * Copyright(c) 2015 - 2017 Intel Deutschland GmbH 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of version 2 of the GNU General Public License as 14 * published by the Free Software Foundation. 15 * 16 * This program is distributed in the hope that it will be useful, but 17 * WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 19 * General Public License for more details. 20 * 21 * The full GNU General Public License is included in this distribution 22 * in the file called COPYING. 23 * 24 * Contact Information: 25 * Intel Linux Wireless <ilw@linux.intel.com> 26 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 27 * 28 * BSD LICENSE 29 * 30 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved. 31 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH 32 * Copyright(c) 2015 - 2017 Intel Deutschland GmbH 33 * All rights reserved. 34 * 35 * Redistribution and use in source and binary forms, with or without 36 * modification, are permitted provided that the following conditions 37 * are met: 38 * 39 * * Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * * Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in 43 * the documentation and/or other materials provided with the 44 * distribution. 45 * * Neither the name Intel Corporation nor the names of its 46 * contributors may be used to endorse or promote products derived 47 * from this software without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 50 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 51 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 52 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 53 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 54 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 55 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 56 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 57 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 58 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 59 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 60 *****************************************************************************/ 61 #include <linux/etherdevice.h> 62 #include <linux/skbuff.h> 63 #include "iwl-trans.h" 64 #include "mvm.h" 65 #include "fw-api.h" 66 #include "fw-dbg.h" 67 68 static inline int iwl_mvm_check_pn(struct iwl_mvm *mvm, struct sk_buff *skb, 69 int queue, struct ieee80211_sta *sta) 70 { 71 struct iwl_mvm_sta *mvmsta; 72 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 73 struct ieee80211_rx_status *stats = IEEE80211_SKB_RXCB(skb); 74 struct iwl_mvm_key_pn *ptk_pn; 75 u8 tid, keyidx; 76 u8 pn[IEEE80211_CCMP_PN_LEN]; 77 u8 *extiv; 78 79 /* do PN checking */ 80 81 /* multicast and non-data only arrives on default queue */ 82 if (!ieee80211_is_data(hdr->frame_control) || 83 is_multicast_ether_addr(hdr->addr1)) 84 return 0; 85 86 /* do not check PN for open AP */ 87 if (!(stats->flag & RX_FLAG_DECRYPTED)) 88 return 0; 89 90 /* 91 * avoid checking for default queue - we don't want to replicate 92 * all the logic that's necessary for checking the PN on fragmented 93 * frames, leave that to mac80211 94 */ 95 if (queue == 0) 96 return 0; 97 98 /* if we are here - this for sure is either CCMP or GCMP */ 99 if (IS_ERR_OR_NULL(sta)) { 100 IWL_ERR(mvm, 101 "expected hw-decrypted unicast frame for station\n"); 102 return -1; 103 } 104 105 mvmsta = iwl_mvm_sta_from_mac80211(sta); 106 107 extiv = (u8 *)hdr + ieee80211_hdrlen(hdr->frame_control); 108 keyidx = extiv[3] >> 6; 109 110 ptk_pn = rcu_dereference(mvmsta->ptk_pn[keyidx]); 111 if (!ptk_pn) 112 return -1; 113 114 if (ieee80211_is_data_qos(hdr->frame_control)) 115 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; 116 else 117 tid = 0; 118 119 /* we don't use HCCA/802.11 QoS TSPECs, so drop such frames */ 120 if (tid >= IWL_MAX_TID_COUNT) 121 return -1; 122 123 /* load pn */ 124 pn[0] = extiv[7]; 125 pn[1] = extiv[6]; 126 pn[2] = extiv[5]; 127 pn[3] = extiv[4]; 128 pn[4] = extiv[1]; 129 pn[5] = extiv[0]; 130 131 if (memcmp(pn, ptk_pn->q[queue].pn[tid], 132 IEEE80211_CCMP_PN_LEN) <= 0) 133 return -1; 134 135 if (!(stats->flag & RX_FLAG_AMSDU_MORE)) 136 memcpy(ptk_pn->q[queue].pn[tid], pn, IEEE80211_CCMP_PN_LEN); 137 stats->flag |= RX_FLAG_PN_VALIDATED; 138 139 return 0; 140 } 141 142 /* iwl_mvm_create_skb Adds the rxb to a new skb */ 143 static void iwl_mvm_create_skb(struct sk_buff *skb, struct ieee80211_hdr *hdr, 144 u16 len, u8 crypt_len, 145 struct iwl_rx_cmd_buffer *rxb) 146 { 147 struct iwl_rx_packet *pkt = rxb_addr(rxb); 148 struct iwl_rx_mpdu_desc *desc = (void *)pkt->data; 149 unsigned int headlen, fraglen, pad_len = 0; 150 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control); 151 152 if (desc->mac_flags2 & IWL_RX_MPDU_MFLG2_PAD) { 153 pad_len = 2; 154 155 /* 156 * If the device inserted padding it means that (it thought) 157 * the 802.11 header wasn't a multiple of 4 bytes long. In 158 * this case, reserve two bytes at the start of the SKB to 159 * align the payload properly in case we end up copying it. 160 */ 161 skb_reserve(skb, pad_len); 162 } 163 len -= pad_len; 164 165 /* If frame is small enough to fit in skb->head, pull it completely. 166 * If not, only pull ieee80211_hdr (including crypto if present, and 167 * an additional 8 bytes for SNAP/ethertype, see below) so that 168 * splice() or TCP coalesce are more efficient. 169 * 170 * Since, in addition, ieee80211_data_to_8023() always pull in at 171 * least 8 bytes (possibly more for mesh) we can do the same here 172 * to save the cost of doing it later. That still doesn't pull in 173 * the actual IP header since the typical case has a SNAP header. 174 * If the latter changes (there are efforts in the standards group 175 * to do so) we should revisit this and ieee80211_data_to_8023(). 176 */ 177 headlen = (len <= skb_tailroom(skb)) ? len : 178 hdrlen + crypt_len + 8; 179 180 /* The firmware may align the packet to DWORD. 181 * The padding is inserted after the IV. 182 * After copying the header + IV skip the padding if 183 * present before copying packet data. 184 */ 185 hdrlen += crypt_len; 186 memcpy(skb_put(skb, hdrlen), hdr, hdrlen); 187 memcpy(skb_put(skb, headlen - hdrlen), (u8 *)hdr + hdrlen + pad_len, 188 headlen - hdrlen); 189 190 fraglen = len - headlen; 191 192 if (fraglen) { 193 int offset = (void *)hdr + headlen + pad_len - 194 rxb_addr(rxb) + rxb_offset(rxb); 195 196 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset, 197 fraglen, rxb->truesize); 198 } 199 } 200 201 /* iwl_mvm_pass_packet_to_mac80211 - passes the packet for mac80211 */ 202 static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm, 203 struct napi_struct *napi, 204 struct sk_buff *skb, int queue, 205 struct ieee80211_sta *sta) 206 { 207 if (iwl_mvm_check_pn(mvm, skb, queue, sta)) 208 kfree_skb(skb); 209 else 210 ieee80211_rx_napi(mvm->hw, sta, skb, napi); 211 } 212 213 static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm, 214 struct iwl_rx_mpdu_desc *desc, 215 struct ieee80211_rx_status *rx_status) 216 { 217 int energy_a, energy_b, max_energy; 218 219 energy_a = desc->energy_a; 220 energy_a = energy_a ? -energy_a : S8_MIN; 221 energy_b = desc->energy_b; 222 energy_b = energy_b ? -energy_b : S8_MIN; 223 max_energy = max(energy_a, energy_b); 224 225 IWL_DEBUG_STATS(mvm, "energy In A %d B %d, and max %d\n", 226 energy_a, energy_b, max_energy); 227 228 rx_status->signal = max_energy; 229 rx_status->chains = 0; /* TODO: phy info */ 230 rx_status->chain_signal[0] = energy_a; 231 rx_status->chain_signal[1] = energy_b; 232 rx_status->chain_signal[2] = S8_MIN; 233 } 234 235 static int iwl_mvm_rx_crypto(struct iwl_mvm *mvm, struct ieee80211_hdr *hdr, 236 struct ieee80211_rx_status *stats, 237 struct iwl_rx_mpdu_desc *desc, int queue, 238 u8 *crypt_len) 239 { 240 u16 status = le16_to_cpu(desc->status); 241 242 if (!ieee80211_has_protected(hdr->frame_control) || 243 (status & IWL_RX_MPDU_STATUS_SEC_MASK) == 244 IWL_RX_MPDU_STATUS_SEC_NONE) 245 return 0; 246 247 /* TODO: handle packets encrypted with unknown alg */ 248 249 switch (status & IWL_RX_MPDU_STATUS_SEC_MASK) { 250 case IWL_RX_MPDU_STATUS_SEC_CCM: 251 case IWL_RX_MPDU_STATUS_SEC_GCM: 252 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN != IEEE80211_GCMP_PN_LEN); 253 /* alg is CCM: check MIC only */ 254 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK)) 255 return -1; 256 257 stats->flag |= RX_FLAG_DECRYPTED; 258 *crypt_len = IEEE80211_CCMP_HDR_LEN; 259 return 0; 260 case IWL_RX_MPDU_STATUS_SEC_TKIP: 261 /* Don't drop the frame and decrypt it in SW */ 262 if (!(status & IWL_RX_MPDU_RES_STATUS_TTAK_OK)) 263 return 0; 264 265 *crypt_len = IEEE80211_TKIP_IV_LEN; 266 /* fall through if TTAK OK */ 267 case IWL_RX_MPDU_STATUS_SEC_WEP: 268 if (!(status & IWL_RX_MPDU_STATUS_ICV_OK)) 269 return -1; 270 271 stats->flag |= RX_FLAG_DECRYPTED; 272 if ((status & IWL_RX_MPDU_STATUS_SEC_MASK) == 273 IWL_RX_MPDU_STATUS_SEC_WEP) 274 *crypt_len = IEEE80211_WEP_IV_LEN; 275 return 0; 276 case IWL_RX_MPDU_STATUS_SEC_EXT_ENC: 277 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK)) 278 return -1; 279 stats->flag |= RX_FLAG_DECRYPTED; 280 return 0; 281 default: 282 IWL_ERR(mvm, "Unhandled alg: 0x%x\n", status); 283 } 284 285 return 0; 286 } 287 288 static void iwl_mvm_rx_csum(struct ieee80211_sta *sta, 289 struct sk_buff *skb, 290 struct iwl_rx_mpdu_desc *desc) 291 { 292 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 293 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif); 294 u16 flags = le16_to_cpu(desc->l3l4_flags); 295 u8 l3_prot = (u8)((flags & IWL_RX_L3L4_L3_PROTO_MASK) >> 296 IWL_RX_L3_PROTO_POS); 297 298 if (mvmvif->features & NETIF_F_RXCSUM && 299 flags & IWL_RX_L3L4_TCP_UDP_CSUM_OK && 300 (flags & IWL_RX_L3L4_IP_HDR_CSUM_OK || 301 l3_prot == IWL_RX_L3_TYPE_IPV6 || 302 l3_prot == IWL_RX_L3_TYPE_IPV6_FRAG)) 303 skb->ip_summed = CHECKSUM_UNNECESSARY; 304 } 305 306 /* 307 * returns true if a packet outside BA session is a duplicate and 308 * should be dropped 309 */ 310 static bool iwl_mvm_is_nonagg_dup(struct ieee80211_sta *sta, int queue, 311 struct ieee80211_rx_status *rx_status, 312 struct ieee80211_hdr *hdr, 313 struct iwl_rx_mpdu_desc *desc) 314 { 315 struct iwl_mvm_sta *mvm_sta; 316 struct iwl_mvm_rxq_dup_data *dup_data; 317 u8 baid, tid, sub_frame_idx; 318 319 if (WARN_ON(IS_ERR_OR_NULL(sta))) 320 return false; 321 322 baid = (le32_to_cpu(desc->reorder_data) & 323 IWL_RX_MPDU_REORDER_BAID_MASK) >> 324 IWL_RX_MPDU_REORDER_BAID_SHIFT; 325 326 if (baid != IWL_RX_REORDER_DATA_INVALID_BAID) 327 return false; 328 329 mvm_sta = iwl_mvm_sta_from_mac80211(sta); 330 dup_data = &mvm_sta->dup_data[queue]; 331 332 /* 333 * Drop duplicate 802.11 retransmissions 334 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery") 335 */ 336 if (ieee80211_is_ctl(hdr->frame_control) || 337 ieee80211_is_qos_nullfunc(hdr->frame_control) || 338 is_multicast_ether_addr(hdr->addr1)) { 339 rx_status->flag |= RX_FLAG_DUP_VALIDATED; 340 return false; 341 } 342 343 if (ieee80211_is_data_qos(hdr->frame_control)) 344 /* frame has qos control */ 345 tid = *ieee80211_get_qos_ctl(hdr) & 346 IEEE80211_QOS_CTL_TID_MASK; 347 else 348 tid = IWL_MAX_TID_COUNT; 349 350 /* If this wasn't a part of an A-MSDU the sub-frame index will be 0 */ 351 sub_frame_idx = desc->amsdu_info & IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK; 352 353 if (unlikely(ieee80211_has_retry(hdr->frame_control) && 354 dup_data->last_seq[tid] == hdr->seq_ctrl && 355 dup_data->last_sub_frame[tid] >= sub_frame_idx)) 356 return true; 357 358 dup_data->last_seq[tid] = hdr->seq_ctrl; 359 dup_data->last_sub_frame[tid] = sub_frame_idx; 360 361 rx_status->flag |= RX_FLAG_DUP_VALIDATED; 362 363 return false; 364 } 365 366 int iwl_mvm_notify_rx_queue(struct iwl_mvm *mvm, u32 rxq_mask, 367 const u8 *data, u32 count) 368 { 369 struct iwl_rxq_sync_cmd *cmd; 370 u32 data_size = sizeof(*cmd) + count; 371 int ret; 372 373 /* should be DWORD aligned */ 374 if (WARN_ON(count & 3 || count > IWL_MULTI_QUEUE_SYNC_MSG_MAX_SIZE)) 375 return -EINVAL; 376 377 cmd = kzalloc(data_size, GFP_KERNEL); 378 if (!cmd) 379 return -ENOMEM; 380 381 cmd->rxq_mask = cpu_to_le32(rxq_mask); 382 cmd->count = cpu_to_le32(count); 383 cmd->flags = 0; 384 memcpy(cmd->payload, data, count); 385 386 ret = iwl_mvm_send_cmd_pdu(mvm, 387 WIDE_ID(DATA_PATH_GROUP, 388 TRIGGER_RX_QUEUES_NOTIF_CMD), 389 0, data_size, cmd); 390 391 kfree(cmd); 392 return ret; 393 } 394 395 /* 396 * Returns true if sn2 - buffer_size < sn1 < sn2. 397 * To be used only in order to compare reorder buffer head with NSSN. 398 * We fully trust NSSN unless it is behind us due to reorder timeout. 399 * Reorder timeout can only bring us up to buffer_size SNs ahead of NSSN. 400 */ 401 static bool iwl_mvm_is_sn_less(u16 sn1, u16 sn2, u16 buffer_size) 402 { 403 return ieee80211_sn_less(sn1, sn2) && 404 !ieee80211_sn_less(sn1, sn2 - buffer_size); 405 } 406 407 #define RX_REORDER_BUF_TIMEOUT_MQ (HZ / 10) 408 409 static void iwl_mvm_release_frames(struct iwl_mvm *mvm, 410 struct ieee80211_sta *sta, 411 struct napi_struct *napi, 412 struct iwl_mvm_reorder_buffer *reorder_buf, 413 u16 nssn) 414 { 415 u16 ssn = reorder_buf->head_sn; 416 417 lockdep_assert_held(&reorder_buf->lock); 418 419 /* ignore nssn smaller than head sn - this can happen due to timeout */ 420 if (iwl_mvm_is_sn_less(nssn, ssn, reorder_buf->buf_size)) 421 goto set_timer; 422 423 while (iwl_mvm_is_sn_less(ssn, nssn, reorder_buf->buf_size)) { 424 int index = ssn % reorder_buf->buf_size; 425 struct sk_buff_head *skb_list = &reorder_buf->entries[index]; 426 struct sk_buff *skb; 427 428 ssn = ieee80211_sn_inc(ssn); 429 430 /* 431 * Empty the list. Will have more than one frame for A-MSDU. 432 * Empty list is valid as well since nssn indicates frames were 433 * received. 434 */ 435 while ((skb = __skb_dequeue(skb_list))) { 436 iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb, 437 reorder_buf->queue, 438 sta); 439 reorder_buf->num_stored--; 440 } 441 } 442 reorder_buf->head_sn = nssn; 443 444 set_timer: 445 if (reorder_buf->num_stored && !reorder_buf->removed) { 446 u16 index = reorder_buf->head_sn % reorder_buf->buf_size; 447 448 while (skb_queue_empty(&reorder_buf->entries[index])) 449 index = (index + 1) % reorder_buf->buf_size; 450 /* modify timer to match next frame's expiration time */ 451 mod_timer(&reorder_buf->reorder_timer, 452 reorder_buf->reorder_time[index] + 1 + 453 RX_REORDER_BUF_TIMEOUT_MQ); 454 } else { 455 del_timer(&reorder_buf->reorder_timer); 456 } 457 } 458 459 void iwl_mvm_reorder_timer_expired(unsigned long data) 460 { 461 struct iwl_mvm_reorder_buffer *buf = (void *)data; 462 int i; 463 u16 sn = 0, index = 0; 464 bool expired = false; 465 bool cont = false; 466 467 spin_lock(&buf->lock); 468 469 if (!buf->num_stored || buf->removed) { 470 spin_unlock(&buf->lock); 471 return; 472 } 473 474 for (i = 0; i < buf->buf_size ; i++) { 475 index = (buf->head_sn + i) % buf->buf_size; 476 477 if (skb_queue_empty(&buf->entries[index])) { 478 /* 479 * If there is a hole and the next frame didn't expire 480 * we want to break and not advance SN 481 */ 482 cont = false; 483 continue; 484 } 485 if (!cont && !time_after(jiffies, buf->reorder_time[index] + 486 RX_REORDER_BUF_TIMEOUT_MQ)) 487 break; 488 489 expired = true; 490 /* continue until next hole after this expired frames */ 491 cont = true; 492 sn = ieee80211_sn_add(buf->head_sn, i + 1); 493 } 494 495 if (expired) { 496 struct ieee80211_sta *sta; 497 498 rcu_read_lock(); 499 sta = rcu_dereference(buf->mvm->fw_id_to_mac_id[buf->sta_id]); 500 /* SN is set to the last expired frame + 1 */ 501 IWL_DEBUG_HT(buf->mvm, 502 "Releasing expired frames for sta %u, sn %d\n", 503 buf->sta_id, sn); 504 iwl_mvm_release_frames(buf->mvm, sta, NULL, buf, sn); 505 rcu_read_unlock(); 506 } else if (buf->num_stored) { 507 /* 508 * If no frame expired and there are stored frames, index is now 509 * pointing to the first unexpired frame - modify timer 510 * accordingly to this frame. 511 */ 512 mod_timer(&buf->reorder_timer, 513 buf->reorder_time[index] + 514 1 + RX_REORDER_BUF_TIMEOUT_MQ); 515 } 516 spin_unlock(&buf->lock); 517 } 518 519 static void iwl_mvm_del_ba(struct iwl_mvm *mvm, int queue, 520 struct iwl_mvm_delba_data *data) 521 { 522 struct iwl_mvm_baid_data *ba_data; 523 struct ieee80211_sta *sta; 524 struct iwl_mvm_reorder_buffer *reorder_buf; 525 u8 baid = data->baid; 526 527 if (WARN_ONCE(baid >= IWL_MAX_BAID, "invalid BAID: %x\n", baid)) 528 return; 529 530 rcu_read_lock(); 531 532 ba_data = rcu_dereference(mvm->baid_map[baid]); 533 if (WARN_ON_ONCE(!ba_data)) 534 goto out; 535 536 sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]); 537 if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) 538 goto out; 539 540 reorder_buf = &ba_data->reorder_buf[queue]; 541 542 /* release all frames that are in the reorder buffer to the stack */ 543 spin_lock_bh(&reorder_buf->lock); 544 iwl_mvm_release_frames(mvm, sta, NULL, reorder_buf, 545 ieee80211_sn_add(reorder_buf->head_sn, 546 reorder_buf->buf_size)); 547 spin_unlock_bh(&reorder_buf->lock); 548 del_timer_sync(&reorder_buf->reorder_timer); 549 550 out: 551 rcu_read_unlock(); 552 } 553 554 void iwl_mvm_rx_queue_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb, 555 int queue) 556 { 557 struct iwl_rx_packet *pkt = rxb_addr(rxb); 558 struct iwl_rxq_sync_notification *notif; 559 struct iwl_mvm_internal_rxq_notif *internal_notif; 560 561 notif = (void *)pkt->data; 562 internal_notif = (void *)notif->payload; 563 564 if (internal_notif->sync) { 565 if (mvm->queue_sync_cookie != internal_notif->cookie) { 566 WARN_ONCE(1, 567 "Received expired RX queue sync message\n"); 568 return; 569 } 570 if (!atomic_dec_return(&mvm->queue_sync_counter)) 571 wake_up(&mvm->rx_sync_waitq); 572 } 573 574 switch (internal_notif->type) { 575 case IWL_MVM_RXQ_EMPTY: 576 break; 577 case IWL_MVM_RXQ_NOTIF_DEL_BA: 578 iwl_mvm_del_ba(mvm, queue, (void *)internal_notif->data); 579 break; 580 default: 581 WARN_ONCE(1, "Invalid identifier %d", internal_notif->type); 582 } 583 } 584 585 /* 586 * Returns true if the MPDU was buffered\dropped, false if it should be passed 587 * to upper layer. 588 */ 589 static bool iwl_mvm_reorder(struct iwl_mvm *mvm, 590 struct napi_struct *napi, 591 int queue, 592 struct ieee80211_sta *sta, 593 struct sk_buff *skb, 594 struct iwl_rx_mpdu_desc *desc) 595 { 596 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 597 struct iwl_mvm_sta *mvm_sta; 598 struct iwl_mvm_baid_data *baid_data; 599 struct iwl_mvm_reorder_buffer *buffer; 600 struct sk_buff *tail; 601 u32 reorder = le32_to_cpu(desc->reorder_data); 602 bool amsdu = desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU; 603 bool last_subframe = 604 desc->amsdu_info & IWL_RX_MPDU_AMSDU_LAST_SUBFRAME; 605 u8 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; 606 u8 sub_frame_idx = desc->amsdu_info & 607 IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK; 608 int index; 609 u16 nssn, sn; 610 u8 baid; 611 612 baid = (reorder & IWL_RX_MPDU_REORDER_BAID_MASK) >> 613 IWL_RX_MPDU_REORDER_BAID_SHIFT; 614 615 /* 616 * This also covers the case of receiving a Block Ack Request 617 * outside a BA session; we'll pass it to mac80211 and that 618 * then sends a delBA action frame. 619 */ 620 if (baid == IWL_RX_REORDER_DATA_INVALID_BAID) 621 return false; 622 623 /* no sta yet */ 624 if (WARN_ON(IS_ERR_OR_NULL(sta))) 625 return false; 626 627 mvm_sta = iwl_mvm_sta_from_mac80211(sta); 628 629 /* not a data packet or a bar */ 630 if (!ieee80211_is_back_req(hdr->frame_control) && 631 (!ieee80211_is_data_qos(hdr->frame_control) || 632 is_multicast_ether_addr(hdr->addr1))) 633 return false; 634 635 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) 636 return false; 637 638 baid_data = rcu_dereference(mvm->baid_map[baid]); 639 if (!baid_data) { 640 WARN(!(reorder & IWL_RX_MPDU_REORDER_BA_OLD_SN), 641 "Received baid %d, but no data exists for this BAID\n", 642 baid); 643 return false; 644 } 645 646 if (WARN(tid != baid_data->tid || mvm_sta->sta_id != baid_data->sta_id, 647 "baid 0x%x is mapped to sta:%d tid:%d, but was received for sta:%d tid:%d\n", 648 baid, baid_data->sta_id, baid_data->tid, mvm_sta->sta_id, 649 tid)) 650 return false; 651 652 nssn = reorder & IWL_RX_MPDU_REORDER_NSSN_MASK; 653 sn = (reorder & IWL_RX_MPDU_REORDER_SN_MASK) >> 654 IWL_RX_MPDU_REORDER_SN_SHIFT; 655 656 buffer = &baid_data->reorder_buf[queue]; 657 658 spin_lock_bh(&buffer->lock); 659 660 if (!buffer->valid) { 661 if (reorder & IWL_RX_MPDU_REORDER_BA_OLD_SN) { 662 spin_unlock_bh(&buffer->lock); 663 return false; 664 } 665 buffer->valid = true; 666 } 667 668 if (ieee80211_is_back_req(hdr->frame_control)) { 669 iwl_mvm_release_frames(mvm, sta, napi, buffer, nssn); 670 goto drop; 671 } 672 673 /* 674 * If there was a significant jump in the nssn - adjust. 675 * If the SN is smaller than the NSSN it might need to first go into 676 * the reorder buffer, in which case we just release up to it and the 677 * rest of the function will take of storing it and releasing up to the 678 * nssn 679 */ 680 if (!iwl_mvm_is_sn_less(nssn, buffer->head_sn + buffer->buf_size, 681 buffer->buf_size)) { 682 u16 min_sn = ieee80211_sn_less(sn, nssn) ? sn : nssn; 683 684 iwl_mvm_release_frames(mvm, sta, napi, buffer, min_sn); 685 } 686 687 /* drop any oudated packets */ 688 if (ieee80211_sn_less(sn, buffer->head_sn)) 689 goto drop; 690 691 /* release immediately if allowed by nssn and no stored frames */ 692 if (!buffer->num_stored && ieee80211_sn_less(sn, nssn)) { 693 if (iwl_mvm_is_sn_less(buffer->head_sn, nssn, 694 buffer->buf_size) && 695 (!amsdu || last_subframe)) 696 buffer->head_sn = nssn; 697 /* No need to update AMSDU last SN - we are moving the head */ 698 spin_unlock_bh(&buffer->lock); 699 return false; 700 } 701 702 index = sn % buffer->buf_size; 703 704 /* 705 * Check if we already stored this frame 706 * As AMSDU is either received or not as whole, logic is simple: 707 * If we have frames in that position in the buffer and the last frame 708 * originated from AMSDU had a different SN then it is a retransmission. 709 * If it is the same SN then if the subframe index is incrementing it 710 * is the same AMSDU - otherwise it is a retransmission. 711 */ 712 tail = skb_peek_tail(&buffer->entries[index]); 713 if (tail && !amsdu) 714 goto drop; 715 else if (tail && (sn != buffer->last_amsdu || 716 buffer->last_sub_index >= sub_frame_idx)) 717 goto drop; 718 719 /* put in reorder buffer */ 720 __skb_queue_tail(&buffer->entries[index], skb); 721 buffer->num_stored++; 722 buffer->reorder_time[index] = jiffies; 723 724 if (amsdu) { 725 buffer->last_amsdu = sn; 726 buffer->last_sub_index = sub_frame_idx; 727 } 728 729 /* 730 * We cannot trust NSSN for AMSDU sub-frames that are not the last. 731 * The reason is that NSSN advances on the first sub-frame, and may 732 * cause the reorder buffer to advance before all the sub-frames arrive. 733 * Example: reorder buffer contains SN 0 & 2, and we receive AMSDU with 734 * SN 1. NSSN for first sub frame will be 3 with the result of driver 735 * releasing SN 0,1, 2. When sub-frame 1 arrives - reorder buffer is 736 * already ahead and it will be dropped. 737 * If the last sub-frame is not on this queue - we will get frame 738 * release notification with up to date NSSN. 739 */ 740 if (!amsdu || last_subframe) 741 iwl_mvm_release_frames(mvm, sta, napi, buffer, nssn); 742 743 spin_unlock_bh(&buffer->lock); 744 return true; 745 746 drop: 747 kfree_skb(skb); 748 spin_unlock_bh(&buffer->lock); 749 return true; 750 } 751 752 static void iwl_mvm_agg_rx_received(struct iwl_mvm *mvm, 753 u32 reorder_data, u8 baid) 754 { 755 unsigned long now = jiffies; 756 unsigned long timeout; 757 struct iwl_mvm_baid_data *data; 758 759 rcu_read_lock(); 760 761 data = rcu_dereference(mvm->baid_map[baid]); 762 if (!data) { 763 WARN_ON(!(reorder_data & IWL_RX_MPDU_REORDER_BA_OLD_SN)); 764 goto out; 765 } 766 767 if (!data->timeout) 768 goto out; 769 770 timeout = data->timeout; 771 /* 772 * Do not update last rx all the time to avoid cache bouncing 773 * between the rx queues. 774 * Update it every timeout. Worst case is the session will 775 * expire after ~ 2 * timeout, which doesn't matter that much. 776 */ 777 if (time_before(data->last_rx + TU_TO_JIFFIES(timeout), now)) 778 /* Update is atomic */ 779 data->last_rx = now; 780 781 out: 782 rcu_read_unlock(); 783 } 784 785 void iwl_mvm_rx_mpdu_mq(struct iwl_mvm *mvm, struct napi_struct *napi, 786 struct iwl_rx_cmd_buffer *rxb, int queue) 787 { 788 struct ieee80211_rx_status *rx_status; 789 struct iwl_rx_packet *pkt = rxb_addr(rxb); 790 struct iwl_rx_mpdu_desc *desc = (void *)pkt->data; 791 struct ieee80211_hdr *hdr = (void *)(pkt->data + sizeof(*desc)); 792 u32 len = le16_to_cpu(desc->mpdu_len); 793 u32 rate_n_flags = le32_to_cpu(desc->rate_n_flags); 794 u16 phy_info = le16_to_cpu(desc->phy_info); 795 struct ieee80211_sta *sta = NULL; 796 struct sk_buff *skb; 797 u8 crypt_len = 0; 798 799 /* Dont use dev_alloc_skb(), we'll have enough headroom once 800 * ieee80211_hdr pulled. 801 */ 802 skb = alloc_skb(128, GFP_ATOMIC); 803 if (!skb) { 804 IWL_ERR(mvm, "alloc_skb failed\n"); 805 return; 806 } 807 808 rx_status = IEEE80211_SKB_RXCB(skb); 809 810 if (iwl_mvm_rx_crypto(mvm, hdr, rx_status, desc, queue, &crypt_len)) { 811 kfree_skb(skb); 812 return; 813 } 814 815 /* 816 * Keep packets with CRC errors (and with overrun) for monitor mode 817 * (otherwise the firmware discards them) but mark them as bad. 818 */ 819 if (!(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_CRC_OK)) || 820 !(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_OVERRUN_OK))) { 821 IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n", 822 le16_to_cpu(desc->status)); 823 rx_status->flag |= RX_FLAG_FAILED_FCS_CRC; 824 } 825 /* set the preamble flag if appropriate */ 826 if (phy_info & IWL_RX_MPDU_PHY_SHORT_PREAMBLE) 827 rx_status->enc_flags |= RX_ENC_FLAG_SHORTPRE; 828 829 if (likely(!(phy_info & IWL_RX_MPDU_PHY_TSF_OVERLOAD))) { 830 rx_status->mactime = le64_to_cpu(desc->tsf_on_air_rise); 831 /* TSF as indicated by the firmware is at INA time */ 832 rx_status->flag |= RX_FLAG_MACTIME_PLCP_START; 833 } 834 rx_status->device_timestamp = le32_to_cpu(desc->gp2_on_air_rise); 835 rx_status->band = desc->channel > 14 ? NL80211_BAND_5GHZ : 836 NL80211_BAND_2GHZ; 837 rx_status->freq = ieee80211_channel_to_frequency(desc->channel, 838 rx_status->band); 839 iwl_mvm_get_signal_strength(mvm, desc, rx_status); 840 841 /* update aggregation data for monitor sake on default queue */ 842 if (!queue && (phy_info & IWL_RX_MPDU_PHY_AMPDU)) { 843 bool toggle_bit = phy_info & IWL_RX_MPDU_PHY_AMPDU_TOGGLE; 844 845 rx_status->flag |= RX_FLAG_AMPDU_DETAILS; 846 rx_status->ampdu_reference = mvm->ampdu_ref; 847 /* toggle is switched whenever new aggregation starts */ 848 if (toggle_bit != mvm->ampdu_toggle) { 849 mvm->ampdu_ref++; 850 mvm->ampdu_toggle = toggle_bit; 851 } 852 } 853 854 rcu_read_lock(); 855 856 if (le16_to_cpu(desc->status) & IWL_RX_MPDU_STATUS_SRC_STA_FOUND) { 857 u8 id = desc->sta_id_flags & IWL_RX_MPDU_SIF_STA_ID_MASK; 858 859 if (!WARN_ON_ONCE(id >= ARRAY_SIZE(mvm->fw_id_to_mac_id))) { 860 sta = rcu_dereference(mvm->fw_id_to_mac_id[id]); 861 if (IS_ERR(sta)) 862 sta = NULL; 863 } 864 } else if (!is_multicast_ether_addr(hdr->addr2)) { 865 /* 866 * This is fine since we prevent two stations with the same 867 * address from being added. 868 */ 869 sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL); 870 } 871 872 if (sta) { 873 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 874 struct ieee80211_vif *tx_blocked_vif = 875 rcu_dereference(mvm->csa_tx_blocked_vif); 876 u8 baid = (u8)((le32_to_cpu(desc->reorder_data) & 877 IWL_RX_MPDU_REORDER_BAID_MASK) >> 878 IWL_RX_MPDU_REORDER_BAID_SHIFT); 879 880 /* 881 * We have tx blocked stations (with CS bit). If we heard 882 * frames from a blocked station on a new channel we can 883 * TX to it again. 884 */ 885 if (unlikely(tx_blocked_vif) && 886 tx_blocked_vif == mvmsta->vif) { 887 struct iwl_mvm_vif *mvmvif = 888 iwl_mvm_vif_from_mac80211(tx_blocked_vif); 889 890 if (mvmvif->csa_target_freq == rx_status->freq) 891 iwl_mvm_sta_modify_disable_tx_ap(mvm, sta, 892 false); 893 } 894 895 rs_update_last_rssi(mvm, &mvmsta->lq_sta, rx_status); 896 897 if (iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_RSSI) && 898 ieee80211_is_beacon(hdr->frame_control)) { 899 struct iwl_fw_dbg_trigger_tlv *trig; 900 struct iwl_fw_dbg_trigger_low_rssi *rssi_trig; 901 bool trig_check; 902 s32 rssi; 903 904 trig = iwl_fw_dbg_get_trigger(mvm->fw, 905 FW_DBG_TRIGGER_RSSI); 906 rssi_trig = (void *)trig->data; 907 rssi = le32_to_cpu(rssi_trig->rssi); 908 909 trig_check = 910 iwl_fw_dbg_trigger_check_stop(mvm, mvmsta->vif, 911 trig); 912 if (trig_check && rx_status->signal < rssi) 913 iwl_mvm_fw_dbg_collect_trig(mvm, trig, NULL); 914 } 915 916 if (ieee80211_is_data(hdr->frame_control)) 917 iwl_mvm_rx_csum(sta, skb, desc); 918 919 if (iwl_mvm_is_nonagg_dup(sta, queue, rx_status, hdr, desc)) { 920 kfree_skb(skb); 921 goto out; 922 } 923 924 /* 925 * Our hardware de-aggregates AMSDUs but copies the mac header 926 * as it to the de-aggregated MPDUs. We need to turn off the 927 * AMSDU bit in the QoS control ourselves. 928 * In addition, HW reverses addr3 and addr4 - reverse it back. 929 */ 930 if ((desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU) && 931 !WARN_ON(!ieee80211_is_data_qos(hdr->frame_control))) { 932 int i; 933 u8 *qc = ieee80211_get_qos_ctl(hdr); 934 u8 mac_addr[ETH_ALEN]; 935 936 *qc &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT; 937 938 for (i = 0; i < ETH_ALEN; i++) 939 mac_addr[i] = hdr->addr3[ETH_ALEN - i - 1]; 940 ether_addr_copy(hdr->addr3, mac_addr); 941 942 if (ieee80211_has_a4(hdr->frame_control)) { 943 for (i = 0; i < ETH_ALEN; i++) 944 mac_addr[i] = 945 hdr->addr4[ETH_ALEN - i - 1]; 946 ether_addr_copy(hdr->addr4, mac_addr); 947 } 948 } 949 if (baid != IWL_RX_REORDER_DATA_INVALID_BAID) { 950 u32 reorder_data = le32_to_cpu(desc->reorder_data); 951 952 iwl_mvm_agg_rx_received(mvm, reorder_data, baid); 953 } 954 } 955 956 /* Set up the HT phy flags */ 957 switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) { 958 case RATE_MCS_CHAN_WIDTH_20: 959 break; 960 case RATE_MCS_CHAN_WIDTH_40: 961 rx_status->bw = RATE_INFO_BW_40; 962 break; 963 case RATE_MCS_CHAN_WIDTH_80: 964 rx_status->bw = RATE_INFO_BW_80; 965 break; 966 case RATE_MCS_CHAN_WIDTH_160: 967 rx_status->bw = RATE_INFO_BW_160; 968 break; 969 } 970 if (rate_n_flags & RATE_MCS_SGI_MSK) 971 rx_status->enc_flags |= RX_ENC_FLAG_SHORT_GI; 972 if (rate_n_flags & RATE_HT_MCS_GF_MSK) 973 rx_status->enc_flags |= RX_ENC_FLAG_HT_GF; 974 if (rate_n_flags & RATE_MCS_LDPC_MSK) 975 rx_status->enc_flags |= RX_ENC_FLAG_LDPC; 976 if (rate_n_flags & RATE_MCS_HT_MSK) { 977 u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >> 978 RATE_MCS_STBC_POS; 979 rx_status->encoding = RX_ENC_HT; 980 rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK; 981 rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT; 982 } else if (rate_n_flags & RATE_MCS_VHT_MSK) { 983 u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >> 984 RATE_MCS_STBC_POS; 985 rx_status->nss = 986 ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >> 987 RATE_VHT_MCS_NSS_POS) + 1; 988 rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK; 989 rx_status->encoding = RX_ENC_VHT; 990 rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT; 991 if (rate_n_flags & RATE_MCS_BF_MSK) 992 rx_status->enc_flags |= RX_ENC_FLAG_BF; 993 } else { 994 int rate = iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags, 995 rx_status->band); 996 997 if (WARN(rate < 0 || rate > 0xFF, 998 "Invalid rate flags 0x%x, band %d,\n", 999 rate_n_flags, rx_status->band)) { 1000 kfree_skb(skb); 1001 goto out; 1002 } 1003 rx_status->rate_idx = rate; 1004 1005 } 1006 1007 /* management stuff on default queue */ 1008 if (!queue) { 1009 if (unlikely((ieee80211_is_beacon(hdr->frame_control) || 1010 ieee80211_is_probe_resp(hdr->frame_control)) && 1011 mvm->sched_scan_pass_all == 1012 SCHED_SCAN_PASS_ALL_ENABLED)) 1013 mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_FOUND; 1014 1015 if (unlikely(ieee80211_is_beacon(hdr->frame_control) || 1016 ieee80211_is_probe_resp(hdr->frame_control))) 1017 rx_status->boottime_ns = ktime_get_boot_ns(); 1018 } 1019 1020 iwl_mvm_create_skb(skb, hdr, len, crypt_len, rxb); 1021 if (!iwl_mvm_reorder(mvm, napi, queue, sta, skb, desc)) 1022 iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb, queue, sta); 1023 out: 1024 rcu_read_unlock(); 1025 } 1026 1027 void iwl_mvm_rx_frame_release(struct iwl_mvm *mvm, struct napi_struct *napi, 1028 struct iwl_rx_cmd_buffer *rxb, int queue) 1029 { 1030 struct iwl_rx_packet *pkt = rxb_addr(rxb); 1031 struct iwl_frame_release *release = (void *)pkt->data; 1032 struct ieee80211_sta *sta; 1033 struct iwl_mvm_reorder_buffer *reorder_buf; 1034 struct iwl_mvm_baid_data *ba_data; 1035 1036 int baid = release->baid; 1037 1038 IWL_DEBUG_HT(mvm, "Frame release notification for BAID %u, NSSN %d\n", 1039 release->baid, le16_to_cpu(release->nssn)); 1040 1041 if (WARN_ON_ONCE(baid == IWL_RX_REORDER_DATA_INVALID_BAID)) 1042 return; 1043 1044 rcu_read_lock(); 1045 1046 ba_data = rcu_dereference(mvm->baid_map[baid]); 1047 if (WARN_ON_ONCE(!ba_data)) 1048 goto out; 1049 1050 sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]); 1051 if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) 1052 goto out; 1053 1054 reorder_buf = &ba_data->reorder_buf[queue]; 1055 1056 spin_lock_bh(&reorder_buf->lock); 1057 iwl_mvm_release_frames(mvm, sta, napi, reorder_buf, 1058 le16_to_cpu(release->nssn)); 1059 spin_unlock_bh(&reorder_buf->lock); 1060 1061 out: 1062 rcu_read_unlock(); 1063 } 1064