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 67 static inline int iwl_mvm_check_pn(struct iwl_mvm *mvm, struct sk_buff *skb, 68 int queue, struct ieee80211_sta *sta) 69 { 70 struct iwl_mvm_sta *mvmsta; 71 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 72 struct ieee80211_rx_status *stats = IEEE80211_SKB_RXCB(skb); 73 struct iwl_mvm_key_pn *ptk_pn; 74 u8 tid, keyidx; 75 u8 pn[IEEE80211_CCMP_PN_LEN]; 76 u8 *extiv; 77 78 /* do PN checking */ 79 80 /* multicast and non-data only arrives on default queue */ 81 if (!ieee80211_is_data(hdr->frame_control) || 82 is_multicast_ether_addr(hdr->addr1)) 83 return 0; 84 85 /* do not check PN for open AP */ 86 if (!(stats->flag & RX_FLAG_DECRYPTED)) 87 return 0; 88 89 /* 90 * avoid checking for default queue - we don't want to replicate 91 * all the logic that's necessary for checking the PN on fragmented 92 * frames, leave that to mac80211 93 */ 94 if (queue == 0) 95 return 0; 96 97 /* if we are here - this for sure is either CCMP or GCMP */ 98 if (IS_ERR_OR_NULL(sta)) { 99 IWL_ERR(mvm, 100 "expected hw-decrypted unicast frame for station\n"); 101 return -1; 102 } 103 104 mvmsta = iwl_mvm_sta_from_mac80211(sta); 105 106 extiv = (u8 *)hdr + ieee80211_hdrlen(hdr->frame_control); 107 keyidx = extiv[3] >> 6; 108 109 ptk_pn = rcu_dereference(mvmsta->ptk_pn[keyidx]); 110 if (!ptk_pn) 111 return -1; 112 113 if (ieee80211_is_data_qos(hdr->frame_control)) 114 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; 115 else 116 tid = 0; 117 118 /* we don't use HCCA/802.11 QoS TSPECs, so drop such frames */ 119 if (tid >= IWL_MAX_TID_COUNT) 120 return -1; 121 122 /* load pn */ 123 pn[0] = extiv[7]; 124 pn[1] = extiv[6]; 125 pn[2] = extiv[5]; 126 pn[3] = extiv[4]; 127 pn[4] = extiv[1]; 128 pn[5] = extiv[0]; 129 130 if (memcmp(pn, ptk_pn->q[queue].pn[tid], 131 IEEE80211_CCMP_PN_LEN) <= 0) 132 return -1; 133 134 if (!(stats->flag & RX_FLAG_AMSDU_MORE)) 135 memcpy(ptk_pn->q[queue].pn[tid], pn, IEEE80211_CCMP_PN_LEN); 136 stats->flag |= RX_FLAG_PN_VALIDATED; 137 138 return 0; 139 } 140 141 /* iwl_mvm_create_skb Adds the rxb to a new skb */ 142 static void iwl_mvm_create_skb(struct sk_buff *skb, struct ieee80211_hdr *hdr, 143 u16 len, u8 crypt_len, 144 struct iwl_rx_cmd_buffer *rxb) 145 { 146 struct iwl_rx_packet *pkt = rxb_addr(rxb); 147 struct iwl_rx_mpdu_desc *desc = (void *)pkt->data; 148 unsigned int headlen, fraglen, pad_len = 0; 149 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control); 150 151 if (desc->mac_flags2 & IWL_RX_MPDU_MFLG2_PAD) { 152 pad_len = 2; 153 154 /* 155 * If the device inserted padding it means that (it thought) 156 * the 802.11 header wasn't a multiple of 4 bytes long. In 157 * this case, reserve two bytes at the start of the SKB to 158 * align the payload properly in case we end up copying it. 159 */ 160 skb_reserve(skb, pad_len); 161 } 162 len -= pad_len; 163 164 /* If frame is small enough to fit in skb->head, pull it completely. 165 * If not, only pull ieee80211_hdr (including crypto if present, and 166 * an additional 8 bytes for SNAP/ethertype, see below) so that 167 * splice() or TCP coalesce are more efficient. 168 * 169 * Since, in addition, ieee80211_data_to_8023() always pull in at 170 * least 8 bytes (possibly more for mesh) we can do the same here 171 * to save the cost of doing it later. That still doesn't pull in 172 * the actual IP header since the typical case has a SNAP header. 173 * If the latter changes (there are efforts in the standards group 174 * to do so) we should revisit this and ieee80211_data_to_8023(). 175 */ 176 headlen = (len <= skb_tailroom(skb)) ? len : 177 hdrlen + crypt_len + 8; 178 179 /* The firmware may align the packet to DWORD. 180 * The padding is inserted after the IV. 181 * After copying the header + IV skip the padding if 182 * present before copying packet data. 183 */ 184 hdrlen += crypt_len; 185 skb_put_data(skb, hdr, hdrlen); 186 skb_put_data(skb, (u8 *)hdr + hdrlen + pad_len, headlen - hdrlen); 187 188 fraglen = len - headlen; 189 190 if (fraglen) { 191 int offset = (void *)hdr + headlen + pad_len - 192 rxb_addr(rxb) + rxb_offset(rxb); 193 194 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset, 195 fraglen, rxb->truesize); 196 } 197 } 198 199 /* iwl_mvm_pass_packet_to_mac80211 - passes the packet for mac80211 */ 200 static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm, 201 struct napi_struct *napi, 202 struct sk_buff *skb, int queue, 203 struct ieee80211_sta *sta) 204 { 205 if (iwl_mvm_check_pn(mvm, skb, queue, sta)) 206 kfree_skb(skb); 207 else 208 ieee80211_rx_napi(mvm->hw, sta, skb, napi); 209 } 210 211 static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm, 212 struct iwl_rx_mpdu_desc *desc, 213 struct ieee80211_rx_status *rx_status) 214 { 215 int energy_a, energy_b, max_energy; 216 217 energy_a = desc->energy_a; 218 energy_a = energy_a ? -energy_a : S8_MIN; 219 energy_b = desc->energy_b; 220 energy_b = energy_b ? -energy_b : S8_MIN; 221 max_energy = max(energy_a, energy_b); 222 223 IWL_DEBUG_STATS(mvm, "energy In A %d B %d, and max %d\n", 224 energy_a, energy_b, max_energy); 225 226 rx_status->signal = max_energy; 227 rx_status->chains = 0; /* TODO: phy info */ 228 rx_status->chain_signal[0] = energy_a; 229 rx_status->chain_signal[1] = energy_b; 230 rx_status->chain_signal[2] = S8_MIN; 231 } 232 233 static int iwl_mvm_rx_crypto(struct iwl_mvm *mvm, struct ieee80211_hdr *hdr, 234 struct ieee80211_rx_status *stats, 235 struct iwl_rx_mpdu_desc *desc, int queue, 236 u8 *crypt_len) 237 { 238 u16 status = le16_to_cpu(desc->status); 239 240 if (!ieee80211_has_protected(hdr->frame_control) || 241 (status & IWL_RX_MPDU_STATUS_SEC_MASK) == 242 IWL_RX_MPDU_STATUS_SEC_NONE) 243 return 0; 244 245 /* TODO: handle packets encrypted with unknown alg */ 246 247 switch (status & IWL_RX_MPDU_STATUS_SEC_MASK) { 248 case IWL_RX_MPDU_STATUS_SEC_CCM: 249 case IWL_RX_MPDU_STATUS_SEC_GCM: 250 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN != IEEE80211_GCMP_PN_LEN); 251 /* alg is CCM: check MIC only */ 252 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK)) 253 return -1; 254 255 stats->flag |= RX_FLAG_DECRYPTED; 256 *crypt_len = IEEE80211_CCMP_HDR_LEN; 257 return 0; 258 case IWL_RX_MPDU_STATUS_SEC_TKIP: 259 /* Don't drop the frame and decrypt it in SW */ 260 if (!(status & IWL_RX_MPDU_RES_STATUS_TTAK_OK)) 261 return 0; 262 263 *crypt_len = IEEE80211_TKIP_IV_LEN; 264 /* fall through if TTAK OK */ 265 case IWL_RX_MPDU_STATUS_SEC_WEP: 266 if (!(status & IWL_RX_MPDU_STATUS_ICV_OK)) 267 return -1; 268 269 stats->flag |= RX_FLAG_DECRYPTED; 270 if ((status & IWL_RX_MPDU_STATUS_SEC_MASK) == 271 IWL_RX_MPDU_STATUS_SEC_WEP) 272 *crypt_len = IEEE80211_WEP_IV_LEN; 273 return 0; 274 case IWL_RX_MPDU_STATUS_SEC_EXT_ENC: 275 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK)) 276 return -1; 277 stats->flag |= RX_FLAG_DECRYPTED; 278 return 0; 279 default: 280 /* Expected in monitor (not having the keys) */ 281 if (!mvm->monitor_on) 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 struct iwl_mvm_sta *mvmsta; 498 499 rcu_read_lock(); 500 sta = rcu_dereference(buf->mvm->fw_id_to_mac_id[buf->sta_id]); 501 mvmsta = iwl_mvm_sta_from_mac80211(sta); 502 503 /* SN is set to the last expired frame + 1 */ 504 IWL_DEBUG_HT(buf->mvm, 505 "Releasing expired frames for sta %u, sn %d\n", 506 buf->sta_id, sn); 507 iwl_mvm_event_frame_timeout_callback(buf->mvm, mvmsta->vif, 508 sta, buf->tid); 509 iwl_mvm_release_frames(buf->mvm, sta, NULL, buf, sn); 510 rcu_read_unlock(); 511 } else { 512 /* 513 * If no frame expired and there are stored frames, index is now 514 * pointing to the first unexpired frame - modify timer 515 * accordingly to this frame. 516 */ 517 mod_timer(&buf->reorder_timer, 518 buf->reorder_time[index] + 519 1 + RX_REORDER_BUF_TIMEOUT_MQ); 520 } 521 spin_unlock(&buf->lock); 522 } 523 524 static void iwl_mvm_del_ba(struct iwl_mvm *mvm, int queue, 525 struct iwl_mvm_delba_data *data) 526 { 527 struct iwl_mvm_baid_data *ba_data; 528 struct ieee80211_sta *sta; 529 struct iwl_mvm_reorder_buffer *reorder_buf; 530 u8 baid = data->baid; 531 532 if (WARN_ONCE(baid >= IWL_MAX_BAID, "invalid BAID: %x\n", baid)) 533 return; 534 535 rcu_read_lock(); 536 537 ba_data = rcu_dereference(mvm->baid_map[baid]); 538 if (WARN_ON_ONCE(!ba_data)) 539 goto out; 540 541 sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]); 542 if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) 543 goto out; 544 545 reorder_buf = &ba_data->reorder_buf[queue]; 546 547 /* release all frames that are in the reorder buffer to the stack */ 548 spin_lock_bh(&reorder_buf->lock); 549 iwl_mvm_release_frames(mvm, sta, NULL, reorder_buf, 550 ieee80211_sn_add(reorder_buf->head_sn, 551 reorder_buf->buf_size)); 552 spin_unlock_bh(&reorder_buf->lock); 553 del_timer_sync(&reorder_buf->reorder_timer); 554 555 out: 556 rcu_read_unlock(); 557 } 558 559 void iwl_mvm_rx_queue_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb, 560 int queue) 561 { 562 struct iwl_rx_packet *pkt = rxb_addr(rxb); 563 struct iwl_rxq_sync_notification *notif; 564 struct iwl_mvm_internal_rxq_notif *internal_notif; 565 566 notif = (void *)pkt->data; 567 internal_notif = (void *)notif->payload; 568 569 if (internal_notif->sync) { 570 if (mvm->queue_sync_cookie != internal_notif->cookie) { 571 WARN_ONCE(1, 572 "Received expired RX queue sync message\n"); 573 return; 574 } 575 if (!atomic_dec_return(&mvm->queue_sync_counter)) 576 wake_up(&mvm->rx_sync_waitq); 577 } 578 579 switch (internal_notif->type) { 580 case IWL_MVM_RXQ_EMPTY: 581 break; 582 case IWL_MVM_RXQ_NOTIF_DEL_BA: 583 iwl_mvm_del_ba(mvm, queue, (void *)internal_notif->data); 584 break; 585 default: 586 WARN_ONCE(1, "Invalid identifier %d", internal_notif->type); 587 } 588 } 589 590 /* 591 * Returns true if the MPDU was buffered\dropped, false if it should be passed 592 * to upper layer. 593 */ 594 static bool iwl_mvm_reorder(struct iwl_mvm *mvm, 595 struct napi_struct *napi, 596 int queue, 597 struct ieee80211_sta *sta, 598 struct sk_buff *skb, 599 struct iwl_rx_mpdu_desc *desc) 600 { 601 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 602 struct iwl_mvm_sta *mvm_sta; 603 struct iwl_mvm_baid_data *baid_data; 604 struct iwl_mvm_reorder_buffer *buffer; 605 struct sk_buff *tail; 606 u32 reorder = le32_to_cpu(desc->reorder_data); 607 bool amsdu = desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU; 608 bool last_subframe = 609 desc->amsdu_info & IWL_RX_MPDU_AMSDU_LAST_SUBFRAME; 610 u8 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; 611 u8 sub_frame_idx = desc->amsdu_info & 612 IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK; 613 int index; 614 u16 nssn, sn; 615 u8 baid; 616 617 baid = (reorder & IWL_RX_MPDU_REORDER_BAID_MASK) >> 618 IWL_RX_MPDU_REORDER_BAID_SHIFT; 619 620 /* 621 * This also covers the case of receiving a Block Ack Request 622 * outside a BA session; we'll pass it to mac80211 and that 623 * then sends a delBA action frame. 624 */ 625 if (baid == IWL_RX_REORDER_DATA_INVALID_BAID) 626 return false; 627 628 /* no sta yet */ 629 if (WARN_ONCE(IS_ERR_OR_NULL(sta), 630 "Got valid BAID without a valid station assigned\n")) 631 return false; 632 633 mvm_sta = iwl_mvm_sta_from_mac80211(sta); 634 635 /* not a data packet or a bar */ 636 if (!ieee80211_is_back_req(hdr->frame_control) && 637 (!ieee80211_is_data_qos(hdr->frame_control) || 638 is_multicast_ether_addr(hdr->addr1))) 639 return false; 640 641 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) 642 return false; 643 644 baid_data = rcu_dereference(mvm->baid_map[baid]); 645 if (!baid_data) { 646 IWL_DEBUG_RX(mvm, 647 "Got valid BAID but no baid allocated, bypass the re-ordering buffer. Baid %d reorder 0x%x\n", 648 baid, reorder); 649 return false; 650 } 651 652 if (WARN(tid != baid_data->tid || mvm_sta->sta_id != baid_data->sta_id, 653 "baid 0x%x is mapped to sta:%d tid:%d, but was received for sta:%d tid:%d\n", 654 baid, baid_data->sta_id, baid_data->tid, mvm_sta->sta_id, 655 tid)) 656 return false; 657 658 nssn = reorder & IWL_RX_MPDU_REORDER_NSSN_MASK; 659 sn = (reorder & IWL_RX_MPDU_REORDER_SN_MASK) >> 660 IWL_RX_MPDU_REORDER_SN_SHIFT; 661 662 buffer = &baid_data->reorder_buf[queue]; 663 664 spin_lock_bh(&buffer->lock); 665 666 if (!buffer->valid) { 667 if (reorder & IWL_RX_MPDU_REORDER_BA_OLD_SN) { 668 spin_unlock_bh(&buffer->lock); 669 return false; 670 } 671 buffer->valid = true; 672 } 673 674 if (ieee80211_is_back_req(hdr->frame_control)) { 675 iwl_mvm_release_frames(mvm, sta, napi, buffer, nssn); 676 goto drop; 677 } 678 679 /* 680 * If there was a significant jump in the nssn - adjust. 681 * If the SN is smaller than the NSSN it might need to first go into 682 * the reorder buffer, in which case we just release up to it and the 683 * rest of the function will take care of storing it and releasing up to 684 * the nssn 685 */ 686 if (!iwl_mvm_is_sn_less(nssn, buffer->head_sn + buffer->buf_size, 687 buffer->buf_size) || 688 !ieee80211_sn_less(sn, buffer->head_sn + buffer->buf_size)) { 689 u16 min_sn = ieee80211_sn_less(sn, nssn) ? sn : nssn; 690 691 iwl_mvm_release_frames(mvm, sta, napi, buffer, min_sn); 692 } 693 694 /* drop any oudated packets */ 695 if (ieee80211_sn_less(sn, buffer->head_sn)) 696 goto drop; 697 698 /* release immediately if allowed by nssn and no stored frames */ 699 if (!buffer->num_stored && ieee80211_sn_less(sn, nssn)) { 700 if (iwl_mvm_is_sn_less(buffer->head_sn, nssn, 701 buffer->buf_size) && 702 (!amsdu || last_subframe)) 703 buffer->head_sn = nssn; 704 /* No need to update AMSDU last SN - we are moving the head */ 705 spin_unlock_bh(&buffer->lock); 706 return false; 707 } 708 709 index = sn % buffer->buf_size; 710 711 /* 712 * Check if we already stored this frame 713 * As AMSDU is either received or not as whole, logic is simple: 714 * If we have frames in that position in the buffer and the last frame 715 * originated from AMSDU had a different SN then it is a retransmission. 716 * If it is the same SN then if the subframe index is incrementing it 717 * is the same AMSDU - otherwise it is a retransmission. 718 */ 719 tail = skb_peek_tail(&buffer->entries[index]); 720 if (tail && !amsdu) 721 goto drop; 722 else if (tail && (sn != buffer->last_amsdu || 723 buffer->last_sub_index >= sub_frame_idx)) 724 goto drop; 725 726 /* put in reorder buffer */ 727 __skb_queue_tail(&buffer->entries[index], skb); 728 buffer->num_stored++; 729 buffer->reorder_time[index] = jiffies; 730 731 if (amsdu) { 732 buffer->last_amsdu = sn; 733 buffer->last_sub_index = sub_frame_idx; 734 } 735 736 /* 737 * We cannot trust NSSN for AMSDU sub-frames that are not the last. 738 * The reason is that NSSN advances on the first sub-frame, and may 739 * cause the reorder buffer to advance before all the sub-frames arrive. 740 * Example: reorder buffer contains SN 0 & 2, and we receive AMSDU with 741 * SN 1. NSSN for first sub frame will be 3 with the result of driver 742 * releasing SN 0,1, 2. When sub-frame 1 arrives - reorder buffer is 743 * already ahead and it will be dropped. 744 * If the last sub-frame is not on this queue - we will get frame 745 * release notification with up to date NSSN. 746 */ 747 if (!amsdu || last_subframe) 748 iwl_mvm_release_frames(mvm, sta, napi, buffer, nssn); 749 750 spin_unlock_bh(&buffer->lock); 751 return true; 752 753 drop: 754 kfree_skb(skb); 755 spin_unlock_bh(&buffer->lock); 756 return true; 757 } 758 759 static void iwl_mvm_agg_rx_received(struct iwl_mvm *mvm, 760 u32 reorder_data, u8 baid) 761 { 762 unsigned long now = jiffies; 763 unsigned long timeout; 764 struct iwl_mvm_baid_data *data; 765 766 rcu_read_lock(); 767 768 data = rcu_dereference(mvm->baid_map[baid]); 769 if (!data) { 770 IWL_DEBUG_RX(mvm, 771 "Got valid BAID but no baid allocated, bypass the re-ordering buffer. Baid %d reorder 0x%x\n", 772 baid, reorder_data); 773 goto out; 774 } 775 776 if (!data->timeout) 777 goto out; 778 779 timeout = data->timeout; 780 /* 781 * Do not update last rx all the time to avoid cache bouncing 782 * between the rx queues. 783 * Update it every timeout. Worst case is the session will 784 * expire after ~ 2 * timeout, which doesn't matter that much. 785 */ 786 if (time_before(data->last_rx + TU_TO_JIFFIES(timeout), now)) 787 /* Update is atomic */ 788 data->last_rx = now; 789 790 out: 791 rcu_read_unlock(); 792 } 793 794 void iwl_mvm_rx_mpdu_mq(struct iwl_mvm *mvm, struct napi_struct *napi, 795 struct iwl_rx_cmd_buffer *rxb, int queue) 796 { 797 struct ieee80211_rx_status *rx_status; 798 struct iwl_rx_packet *pkt = rxb_addr(rxb); 799 struct iwl_rx_mpdu_desc *desc = (void *)pkt->data; 800 struct ieee80211_hdr *hdr = (void *)(pkt->data + sizeof(*desc)); 801 u32 len = le16_to_cpu(desc->mpdu_len); 802 u32 rate_n_flags = le32_to_cpu(desc->rate_n_flags); 803 u16 phy_info = le16_to_cpu(desc->phy_info); 804 struct ieee80211_sta *sta = NULL; 805 struct sk_buff *skb; 806 u8 crypt_len = 0; 807 808 /* Dont use dev_alloc_skb(), we'll have enough headroom once 809 * ieee80211_hdr pulled. 810 */ 811 skb = alloc_skb(128, GFP_ATOMIC); 812 if (!skb) { 813 IWL_ERR(mvm, "alloc_skb failed\n"); 814 return; 815 } 816 817 rx_status = IEEE80211_SKB_RXCB(skb); 818 819 if (iwl_mvm_rx_crypto(mvm, hdr, rx_status, desc, queue, &crypt_len)) { 820 kfree_skb(skb); 821 return; 822 } 823 824 /* 825 * Keep packets with CRC errors (and with overrun) for monitor mode 826 * (otherwise the firmware discards them) but mark them as bad. 827 */ 828 if (!(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_CRC_OK)) || 829 !(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_OVERRUN_OK))) { 830 IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n", 831 le16_to_cpu(desc->status)); 832 rx_status->flag |= RX_FLAG_FAILED_FCS_CRC; 833 } 834 /* set the preamble flag if appropriate */ 835 if (phy_info & IWL_RX_MPDU_PHY_SHORT_PREAMBLE) 836 rx_status->enc_flags |= RX_ENC_FLAG_SHORTPRE; 837 838 if (likely(!(phy_info & IWL_RX_MPDU_PHY_TSF_OVERLOAD))) { 839 rx_status->mactime = le64_to_cpu(desc->tsf_on_air_rise); 840 /* TSF as indicated by the firmware is at INA time */ 841 rx_status->flag |= RX_FLAG_MACTIME_PLCP_START; 842 } 843 rx_status->device_timestamp = le32_to_cpu(desc->gp2_on_air_rise); 844 rx_status->band = desc->channel > 14 ? NL80211_BAND_5GHZ : 845 NL80211_BAND_2GHZ; 846 rx_status->freq = ieee80211_channel_to_frequency(desc->channel, 847 rx_status->band); 848 iwl_mvm_get_signal_strength(mvm, desc, rx_status); 849 850 /* update aggregation data for monitor sake on default queue */ 851 if (!queue && (phy_info & IWL_RX_MPDU_PHY_AMPDU)) { 852 bool toggle_bit = phy_info & IWL_RX_MPDU_PHY_AMPDU_TOGGLE; 853 854 rx_status->flag |= RX_FLAG_AMPDU_DETAILS; 855 rx_status->ampdu_reference = mvm->ampdu_ref; 856 /* toggle is switched whenever new aggregation starts */ 857 if (toggle_bit != mvm->ampdu_toggle) { 858 mvm->ampdu_ref++; 859 mvm->ampdu_toggle = toggle_bit; 860 } 861 } 862 863 rcu_read_lock(); 864 865 if (desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_SRC_STA_FOUND)) { 866 u8 id = desc->sta_id_flags & IWL_RX_MPDU_SIF_STA_ID_MASK; 867 868 if (!WARN_ON_ONCE(id >= ARRAY_SIZE(mvm->fw_id_to_mac_id))) { 869 sta = rcu_dereference(mvm->fw_id_to_mac_id[id]); 870 if (IS_ERR(sta)) 871 sta = NULL; 872 } 873 } else if (!is_multicast_ether_addr(hdr->addr2)) { 874 /* 875 * This is fine since we prevent two stations with the same 876 * address from being added. 877 */ 878 sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL); 879 } 880 881 if (sta) { 882 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 883 struct ieee80211_vif *tx_blocked_vif = 884 rcu_dereference(mvm->csa_tx_blocked_vif); 885 u8 baid = (u8)((le32_to_cpu(desc->reorder_data) & 886 IWL_RX_MPDU_REORDER_BAID_MASK) >> 887 IWL_RX_MPDU_REORDER_BAID_SHIFT); 888 889 /* 890 * We have tx blocked stations (with CS bit). If we heard 891 * frames from a blocked station on a new channel we can 892 * TX to it again. 893 */ 894 if (unlikely(tx_blocked_vif) && 895 tx_blocked_vif == mvmsta->vif) { 896 struct iwl_mvm_vif *mvmvif = 897 iwl_mvm_vif_from_mac80211(tx_blocked_vif); 898 899 if (mvmvif->csa_target_freq == rx_status->freq) 900 iwl_mvm_sta_modify_disable_tx_ap(mvm, sta, 901 false); 902 } 903 904 rs_update_last_rssi(mvm, &mvmsta->lq_sta, rx_status); 905 906 if (iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_RSSI) && 907 ieee80211_is_beacon(hdr->frame_control)) { 908 struct iwl_fw_dbg_trigger_tlv *trig; 909 struct iwl_fw_dbg_trigger_low_rssi *rssi_trig; 910 bool trig_check; 911 s32 rssi; 912 913 trig = iwl_fw_dbg_get_trigger(mvm->fw, 914 FW_DBG_TRIGGER_RSSI); 915 rssi_trig = (void *)trig->data; 916 rssi = le32_to_cpu(rssi_trig->rssi); 917 918 trig_check = 919 iwl_fw_dbg_trigger_check_stop(&mvm->fwrt, 920 ieee80211_vif_to_wdev(mvmsta->vif), 921 trig); 922 if (trig_check && rx_status->signal < rssi) 923 iwl_fw_dbg_collect_trig(&mvm->fwrt, trig, 924 NULL); 925 } 926 927 if (ieee80211_is_data(hdr->frame_control)) 928 iwl_mvm_rx_csum(sta, skb, desc); 929 930 if (iwl_mvm_is_nonagg_dup(sta, queue, rx_status, hdr, desc)) { 931 kfree_skb(skb); 932 goto out; 933 } 934 935 /* 936 * Our hardware de-aggregates AMSDUs but copies the mac header 937 * as it to the de-aggregated MPDUs. We need to turn off the 938 * AMSDU bit in the QoS control ourselves. 939 * In addition, HW reverses addr3 and addr4 - reverse it back. 940 */ 941 if ((desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU) && 942 !WARN_ON(!ieee80211_is_data_qos(hdr->frame_control))) { 943 int i; 944 u8 *qc = ieee80211_get_qos_ctl(hdr); 945 u8 mac_addr[ETH_ALEN]; 946 947 *qc &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT; 948 949 for (i = 0; i < ETH_ALEN; i++) 950 mac_addr[i] = hdr->addr3[ETH_ALEN - i - 1]; 951 ether_addr_copy(hdr->addr3, mac_addr); 952 953 if (ieee80211_has_a4(hdr->frame_control)) { 954 for (i = 0; i < ETH_ALEN; i++) 955 mac_addr[i] = 956 hdr->addr4[ETH_ALEN - i - 1]; 957 ether_addr_copy(hdr->addr4, mac_addr); 958 } 959 } 960 if (baid != IWL_RX_REORDER_DATA_INVALID_BAID) { 961 u32 reorder_data = le32_to_cpu(desc->reorder_data); 962 963 iwl_mvm_agg_rx_received(mvm, reorder_data, baid); 964 } 965 } 966 967 /* Set up the HT phy flags */ 968 switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) { 969 case RATE_MCS_CHAN_WIDTH_20: 970 break; 971 case RATE_MCS_CHAN_WIDTH_40: 972 rx_status->bw = RATE_INFO_BW_40; 973 break; 974 case RATE_MCS_CHAN_WIDTH_80: 975 rx_status->bw = RATE_INFO_BW_80; 976 break; 977 case RATE_MCS_CHAN_WIDTH_160: 978 rx_status->bw = RATE_INFO_BW_160; 979 break; 980 } 981 if (rate_n_flags & RATE_MCS_SGI_MSK) 982 rx_status->enc_flags |= RX_ENC_FLAG_SHORT_GI; 983 if (rate_n_flags & RATE_HT_MCS_GF_MSK) 984 rx_status->enc_flags |= RX_ENC_FLAG_HT_GF; 985 if (rate_n_flags & RATE_MCS_LDPC_MSK) 986 rx_status->enc_flags |= RX_ENC_FLAG_LDPC; 987 if (rate_n_flags & RATE_MCS_HT_MSK) { 988 u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >> 989 RATE_MCS_STBC_POS; 990 rx_status->encoding = RX_ENC_HT; 991 rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK; 992 rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT; 993 } else if (rate_n_flags & RATE_MCS_VHT_MSK) { 994 u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >> 995 RATE_MCS_STBC_POS; 996 rx_status->nss = 997 ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >> 998 RATE_VHT_MCS_NSS_POS) + 1; 999 rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK; 1000 rx_status->encoding = RX_ENC_VHT; 1001 rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT; 1002 if (rate_n_flags & RATE_MCS_BF_MSK) 1003 rx_status->enc_flags |= RX_ENC_FLAG_BF; 1004 } else { 1005 int rate = iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags, 1006 rx_status->band); 1007 1008 if (WARN(rate < 0 || rate > 0xFF, 1009 "Invalid rate flags 0x%x, band %d,\n", 1010 rate_n_flags, rx_status->band)) { 1011 kfree_skb(skb); 1012 goto out; 1013 } 1014 rx_status->rate_idx = rate; 1015 1016 } 1017 1018 /* management stuff on default queue */ 1019 if (!queue) { 1020 if (unlikely((ieee80211_is_beacon(hdr->frame_control) || 1021 ieee80211_is_probe_resp(hdr->frame_control)) && 1022 mvm->sched_scan_pass_all == 1023 SCHED_SCAN_PASS_ALL_ENABLED)) 1024 mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_FOUND; 1025 1026 if (unlikely(ieee80211_is_beacon(hdr->frame_control) || 1027 ieee80211_is_probe_resp(hdr->frame_control))) 1028 rx_status->boottime_ns = ktime_get_boot_ns(); 1029 } 1030 1031 iwl_mvm_create_skb(skb, hdr, len, crypt_len, rxb); 1032 if (!iwl_mvm_reorder(mvm, napi, queue, sta, skb, desc)) 1033 iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb, queue, sta); 1034 out: 1035 rcu_read_unlock(); 1036 } 1037 1038 void iwl_mvm_rx_frame_release(struct iwl_mvm *mvm, struct napi_struct *napi, 1039 struct iwl_rx_cmd_buffer *rxb, int queue) 1040 { 1041 struct iwl_rx_packet *pkt = rxb_addr(rxb); 1042 struct iwl_frame_release *release = (void *)pkt->data; 1043 struct ieee80211_sta *sta; 1044 struct iwl_mvm_reorder_buffer *reorder_buf; 1045 struct iwl_mvm_baid_data *ba_data; 1046 1047 int baid = release->baid; 1048 1049 IWL_DEBUG_HT(mvm, "Frame release notification for BAID %u, NSSN %d\n", 1050 release->baid, le16_to_cpu(release->nssn)); 1051 1052 if (WARN_ON_ONCE(baid == IWL_RX_REORDER_DATA_INVALID_BAID)) 1053 return; 1054 1055 rcu_read_lock(); 1056 1057 ba_data = rcu_dereference(mvm->baid_map[baid]); 1058 if (WARN_ON_ONCE(!ba_data)) 1059 goto out; 1060 1061 sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]); 1062 if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) 1063 goto out; 1064 1065 reorder_buf = &ba_data->reorder_buf[queue]; 1066 1067 spin_lock_bh(&reorder_buf->lock); 1068 iwl_mvm_release_frames(mvm, sta, napi, reorder_buf, 1069 le16_to_cpu(release->nssn)); 1070 spin_unlock_bh(&reorder_buf->lock); 1071 1072 out: 1073 rcu_read_unlock(); 1074 } 1075