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 IWL_ERR(mvm, "Unhandled alg: 0x%x\n", status); 281 } 282 283 return 0; 284 } 285 286 static void iwl_mvm_rx_csum(struct ieee80211_sta *sta, 287 struct sk_buff *skb, 288 struct iwl_rx_mpdu_desc *desc) 289 { 290 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 291 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif); 292 u16 flags = le16_to_cpu(desc->l3l4_flags); 293 u8 l3_prot = (u8)((flags & IWL_RX_L3L4_L3_PROTO_MASK) >> 294 IWL_RX_L3_PROTO_POS); 295 296 if (mvmvif->features & NETIF_F_RXCSUM && 297 flags & IWL_RX_L3L4_TCP_UDP_CSUM_OK && 298 (flags & IWL_RX_L3L4_IP_HDR_CSUM_OK || 299 l3_prot == IWL_RX_L3_TYPE_IPV6 || 300 l3_prot == IWL_RX_L3_TYPE_IPV6_FRAG)) 301 skb->ip_summed = CHECKSUM_UNNECESSARY; 302 } 303 304 /* 305 * returns true if a packet outside BA session is a duplicate and 306 * should be dropped 307 */ 308 static bool iwl_mvm_is_nonagg_dup(struct ieee80211_sta *sta, int queue, 309 struct ieee80211_rx_status *rx_status, 310 struct ieee80211_hdr *hdr, 311 struct iwl_rx_mpdu_desc *desc) 312 { 313 struct iwl_mvm_sta *mvm_sta; 314 struct iwl_mvm_rxq_dup_data *dup_data; 315 u8 baid, tid, sub_frame_idx; 316 317 if (WARN_ON(IS_ERR_OR_NULL(sta))) 318 return false; 319 320 baid = (le32_to_cpu(desc->reorder_data) & 321 IWL_RX_MPDU_REORDER_BAID_MASK) >> 322 IWL_RX_MPDU_REORDER_BAID_SHIFT; 323 324 if (baid != IWL_RX_REORDER_DATA_INVALID_BAID) 325 return false; 326 327 mvm_sta = iwl_mvm_sta_from_mac80211(sta); 328 dup_data = &mvm_sta->dup_data[queue]; 329 330 /* 331 * Drop duplicate 802.11 retransmissions 332 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery") 333 */ 334 if (ieee80211_is_ctl(hdr->frame_control) || 335 ieee80211_is_qos_nullfunc(hdr->frame_control) || 336 is_multicast_ether_addr(hdr->addr1)) { 337 rx_status->flag |= RX_FLAG_DUP_VALIDATED; 338 return false; 339 } 340 341 if (ieee80211_is_data_qos(hdr->frame_control)) 342 /* frame has qos control */ 343 tid = *ieee80211_get_qos_ctl(hdr) & 344 IEEE80211_QOS_CTL_TID_MASK; 345 else 346 tid = IWL_MAX_TID_COUNT; 347 348 /* If this wasn't a part of an A-MSDU the sub-frame index will be 0 */ 349 sub_frame_idx = desc->amsdu_info & IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK; 350 351 if (unlikely(ieee80211_has_retry(hdr->frame_control) && 352 dup_data->last_seq[tid] == hdr->seq_ctrl && 353 dup_data->last_sub_frame[tid] >= sub_frame_idx)) 354 return true; 355 356 dup_data->last_seq[tid] = hdr->seq_ctrl; 357 dup_data->last_sub_frame[tid] = sub_frame_idx; 358 359 rx_status->flag |= RX_FLAG_DUP_VALIDATED; 360 361 return false; 362 } 363 364 int iwl_mvm_notify_rx_queue(struct iwl_mvm *mvm, u32 rxq_mask, 365 const u8 *data, u32 count) 366 { 367 struct iwl_rxq_sync_cmd *cmd; 368 u32 data_size = sizeof(*cmd) + count; 369 int ret; 370 371 /* should be DWORD aligned */ 372 if (WARN_ON(count & 3 || count > IWL_MULTI_QUEUE_SYNC_MSG_MAX_SIZE)) 373 return -EINVAL; 374 375 cmd = kzalloc(data_size, GFP_KERNEL); 376 if (!cmd) 377 return -ENOMEM; 378 379 cmd->rxq_mask = cpu_to_le32(rxq_mask); 380 cmd->count = cpu_to_le32(count); 381 cmd->flags = 0; 382 memcpy(cmd->payload, data, count); 383 384 ret = iwl_mvm_send_cmd_pdu(mvm, 385 WIDE_ID(DATA_PATH_GROUP, 386 TRIGGER_RX_QUEUES_NOTIF_CMD), 387 0, data_size, cmd); 388 389 kfree(cmd); 390 return ret; 391 } 392 393 /* 394 * Returns true if sn2 - buffer_size < sn1 < sn2. 395 * To be used only in order to compare reorder buffer head with NSSN. 396 * We fully trust NSSN unless it is behind us due to reorder timeout. 397 * Reorder timeout can only bring us up to buffer_size SNs ahead of NSSN. 398 */ 399 static bool iwl_mvm_is_sn_less(u16 sn1, u16 sn2, u16 buffer_size) 400 { 401 return ieee80211_sn_less(sn1, sn2) && 402 !ieee80211_sn_less(sn1, sn2 - buffer_size); 403 } 404 405 #define RX_REORDER_BUF_TIMEOUT_MQ (HZ / 10) 406 407 static void iwl_mvm_release_frames(struct iwl_mvm *mvm, 408 struct ieee80211_sta *sta, 409 struct napi_struct *napi, 410 struct iwl_mvm_reorder_buffer *reorder_buf, 411 u16 nssn) 412 { 413 u16 ssn = reorder_buf->head_sn; 414 415 lockdep_assert_held(&reorder_buf->lock); 416 417 /* ignore nssn smaller than head sn - this can happen due to timeout */ 418 if (iwl_mvm_is_sn_less(nssn, ssn, reorder_buf->buf_size)) 419 goto set_timer; 420 421 while (iwl_mvm_is_sn_less(ssn, nssn, reorder_buf->buf_size)) { 422 int index = ssn % reorder_buf->buf_size; 423 struct sk_buff_head *skb_list = &reorder_buf->entries[index]; 424 struct sk_buff *skb; 425 426 ssn = ieee80211_sn_inc(ssn); 427 428 /* 429 * Empty the list. Will have more than one frame for A-MSDU. 430 * Empty list is valid as well since nssn indicates frames were 431 * received. 432 */ 433 while ((skb = __skb_dequeue(skb_list))) { 434 iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb, 435 reorder_buf->queue, 436 sta); 437 reorder_buf->num_stored--; 438 } 439 } 440 reorder_buf->head_sn = nssn; 441 442 set_timer: 443 if (reorder_buf->num_stored && !reorder_buf->removed) { 444 u16 index = reorder_buf->head_sn % reorder_buf->buf_size; 445 446 while (skb_queue_empty(&reorder_buf->entries[index])) 447 index = (index + 1) % reorder_buf->buf_size; 448 /* modify timer to match next frame's expiration time */ 449 mod_timer(&reorder_buf->reorder_timer, 450 reorder_buf->reorder_time[index] + 1 + 451 RX_REORDER_BUF_TIMEOUT_MQ); 452 } else { 453 del_timer(&reorder_buf->reorder_timer); 454 } 455 } 456 457 void iwl_mvm_reorder_timer_expired(unsigned long data) 458 { 459 struct iwl_mvm_reorder_buffer *buf = (void *)data; 460 int i; 461 u16 sn = 0, index = 0; 462 bool expired = false; 463 bool cont = false; 464 465 spin_lock(&buf->lock); 466 467 if (!buf->num_stored || buf->removed) { 468 spin_unlock(&buf->lock); 469 return; 470 } 471 472 for (i = 0; i < buf->buf_size ; i++) { 473 index = (buf->head_sn + i) % buf->buf_size; 474 475 if (skb_queue_empty(&buf->entries[index])) { 476 /* 477 * If there is a hole and the next frame didn't expire 478 * we want to break and not advance SN 479 */ 480 cont = false; 481 continue; 482 } 483 if (!cont && !time_after(jiffies, buf->reorder_time[index] + 484 RX_REORDER_BUF_TIMEOUT_MQ)) 485 break; 486 487 expired = true; 488 /* continue until next hole after this expired frames */ 489 cont = true; 490 sn = ieee80211_sn_add(buf->head_sn, i + 1); 491 } 492 493 if (expired) { 494 struct ieee80211_sta *sta; 495 496 rcu_read_lock(); 497 sta = rcu_dereference(buf->mvm->fw_id_to_mac_id[buf->sta_id]); 498 /* SN is set to the last expired frame + 1 */ 499 IWL_DEBUG_HT(buf->mvm, 500 "Releasing expired frames for sta %u, sn %d\n", 501 buf->sta_id, sn); 502 iwl_mvm_release_frames(buf->mvm, sta, NULL, buf, sn); 503 rcu_read_unlock(); 504 } else { 505 /* 506 * If no frame expired and there are stored frames, index is now 507 * pointing to the first unexpired frame - modify timer 508 * accordingly to this frame. 509 */ 510 mod_timer(&buf->reorder_timer, 511 buf->reorder_time[index] + 512 1 + RX_REORDER_BUF_TIMEOUT_MQ); 513 } 514 spin_unlock(&buf->lock); 515 } 516 517 static void iwl_mvm_del_ba(struct iwl_mvm *mvm, int queue, 518 struct iwl_mvm_delba_data *data) 519 { 520 struct iwl_mvm_baid_data *ba_data; 521 struct ieee80211_sta *sta; 522 struct iwl_mvm_reorder_buffer *reorder_buf; 523 u8 baid = data->baid; 524 525 if (WARN_ONCE(baid >= IWL_MAX_BAID, "invalid BAID: %x\n", baid)) 526 return; 527 528 rcu_read_lock(); 529 530 ba_data = rcu_dereference(mvm->baid_map[baid]); 531 if (WARN_ON_ONCE(!ba_data)) 532 goto out; 533 534 sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]); 535 if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) 536 goto out; 537 538 reorder_buf = &ba_data->reorder_buf[queue]; 539 540 /* release all frames that are in the reorder buffer to the stack */ 541 spin_lock_bh(&reorder_buf->lock); 542 iwl_mvm_release_frames(mvm, sta, NULL, reorder_buf, 543 ieee80211_sn_add(reorder_buf->head_sn, 544 reorder_buf->buf_size)); 545 spin_unlock_bh(&reorder_buf->lock); 546 del_timer_sync(&reorder_buf->reorder_timer); 547 548 out: 549 rcu_read_unlock(); 550 } 551 552 void iwl_mvm_rx_queue_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb, 553 int queue) 554 { 555 struct iwl_rx_packet *pkt = rxb_addr(rxb); 556 struct iwl_rxq_sync_notification *notif; 557 struct iwl_mvm_internal_rxq_notif *internal_notif; 558 559 notif = (void *)pkt->data; 560 internal_notif = (void *)notif->payload; 561 562 if (internal_notif->sync) { 563 if (mvm->queue_sync_cookie != internal_notif->cookie) { 564 WARN_ONCE(1, 565 "Received expired RX queue sync message\n"); 566 return; 567 } 568 if (!atomic_dec_return(&mvm->queue_sync_counter)) 569 wake_up(&mvm->rx_sync_waitq); 570 } 571 572 switch (internal_notif->type) { 573 case IWL_MVM_RXQ_EMPTY: 574 break; 575 case IWL_MVM_RXQ_NOTIF_DEL_BA: 576 iwl_mvm_del_ba(mvm, queue, (void *)internal_notif->data); 577 break; 578 default: 579 WARN_ONCE(1, "Invalid identifier %d", internal_notif->type); 580 } 581 } 582 583 /* 584 * Returns true if the MPDU was buffered\dropped, false if it should be passed 585 * to upper layer. 586 */ 587 static bool iwl_mvm_reorder(struct iwl_mvm *mvm, 588 struct napi_struct *napi, 589 int queue, 590 struct ieee80211_sta *sta, 591 struct sk_buff *skb, 592 struct iwl_rx_mpdu_desc *desc) 593 { 594 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 595 struct iwl_mvm_sta *mvm_sta; 596 struct iwl_mvm_baid_data *baid_data; 597 struct iwl_mvm_reorder_buffer *buffer; 598 struct sk_buff *tail; 599 u32 reorder = le32_to_cpu(desc->reorder_data); 600 bool amsdu = desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU; 601 bool last_subframe = 602 desc->amsdu_info & IWL_RX_MPDU_AMSDU_LAST_SUBFRAME; 603 u8 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; 604 u8 sub_frame_idx = desc->amsdu_info & 605 IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK; 606 int index; 607 u16 nssn, sn; 608 u8 baid; 609 610 baid = (reorder & IWL_RX_MPDU_REORDER_BAID_MASK) >> 611 IWL_RX_MPDU_REORDER_BAID_SHIFT; 612 613 /* 614 * This also covers the case of receiving a Block Ack Request 615 * outside a BA session; we'll pass it to mac80211 and that 616 * then sends a delBA action frame. 617 */ 618 if (baid == IWL_RX_REORDER_DATA_INVALID_BAID) 619 return false; 620 621 /* no sta yet */ 622 if (WARN_ON(IS_ERR_OR_NULL(sta))) 623 return false; 624 625 mvm_sta = iwl_mvm_sta_from_mac80211(sta); 626 627 /* not a data packet or a bar */ 628 if (!ieee80211_is_back_req(hdr->frame_control) && 629 (!ieee80211_is_data_qos(hdr->frame_control) || 630 is_multicast_ether_addr(hdr->addr1))) 631 return false; 632 633 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) 634 return false; 635 636 baid_data = rcu_dereference(mvm->baid_map[baid]); 637 if (!baid_data) { 638 IWL_DEBUG_RX(mvm, 639 "Got valid BAID but no baid allocated, bypass the re-ordering buffer. Baid %d reorder 0x%x\n", 640 baid, reorder); 641 return false; 642 } 643 644 if (WARN(tid != baid_data->tid || mvm_sta->sta_id != baid_data->sta_id, 645 "baid 0x%x is mapped to sta:%d tid:%d, but was received for sta:%d tid:%d\n", 646 baid, baid_data->sta_id, baid_data->tid, mvm_sta->sta_id, 647 tid)) 648 return false; 649 650 nssn = reorder & IWL_RX_MPDU_REORDER_NSSN_MASK; 651 sn = (reorder & IWL_RX_MPDU_REORDER_SN_MASK) >> 652 IWL_RX_MPDU_REORDER_SN_SHIFT; 653 654 buffer = &baid_data->reorder_buf[queue]; 655 656 spin_lock_bh(&buffer->lock); 657 658 if (!buffer->valid) { 659 if (reorder & IWL_RX_MPDU_REORDER_BA_OLD_SN) { 660 spin_unlock_bh(&buffer->lock); 661 return false; 662 } 663 buffer->valid = true; 664 } 665 666 if (ieee80211_is_back_req(hdr->frame_control)) { 667 iwl_mvm_release_frames(mvm, sta, napi, buffer, nssn); 668 goto drop; 669 } 670 671 /* 672 * If there was a significant jump in the nssn - adjust. 673 * If the SN is smaller than the NSSN it might need to first go into 674 * the reorder buffer, in which case we just release up to it and the 675 * rest of the function will take of storing it and releasing up to the 676 * nssn 677 */ 678 if (!iwl_mvm_is_sn_less(nssn, buffer->head_sn + buffer->buf_size, 679 buffer->buf_size)) { 680 u16 min_sn = ieee80211_sn_less(sn, nssn) ? sn : nssn; 681 682 iwl_mvm_release_frames(mvm, sta, napi, buffer, min_sn); 683 } 684 685 /* drop any oudated packets */ 686 if (ieee80211_sn_less(sn, buffer->head_sn)) 687 goto drop; 688 689 /* release immediately if allowed by nssn and no stored frames */ 690 if (!buffer->num_stored && ieee80211_sn_less(sn, nssn)) { 691 if (iwl_mvm_is_sn_less(buffer->head_sn, nssn, 692 buffer->buf_size) && 693 (!amsdu || last_subframe)) 694 buffer->head_sn = nssn; 695 /* No need to update AMSDU last SN - we are moving the head */ 696 spin_unlock_bh(&buffer->lock); 697 return false; 698 } 699 700 index = sn % buffer->buf_size; 701 702 /* 703 * Check if we already stored this frame 704 * As AMSDU is either received or not as whole, logic is simple: 705 * If we have frames in that position in the buffer and the last frame 706 * originated from AMSDU had a different SN then it is a retransmission. 707 * If it is the same SN then if the subframe index is incrementing it 708 * is the same AMSDU - otherwise it is a retransmission. 709 */ 710 tail = skb_peek_tail(&buffer->entries[index]); 711 if (tail && !amsdu) 712 goto drop; 713 else if (tail && (sn != buffer->last_amsdu || 714 buffer->last_sub_index >= sub_frame_idx)) 715 goto drop; 716 717 /* put in reorder buffer */ 718 __skb_queue_tail(&buffer->entries[index], skb); 719 buffer->num_stored++; 720 buffer->reorder_time[index] = jiffies; 721 722 if (amsdu) { 723 buffer->last_amsdu = sn; 724 buffer->last_sub_index = sub_frame_idx; 725 } 726 727 /* 728 * We cannot trust NSSN for AMSDU sub-frames that are not the last. 729 * The reason is that NSSN advances on the first sub-frame, and may 730 * cause the reorder buffer to advance before all the sub-frames arrive. 731 * Example: reorder buffer contains SN 0 & 2, and we receive AMSDU with 732 * SN 1. NSSN for first sub frame will be 3 with the result of driver 733 * releasing SN 0,1, 2. When sub-frame 1 arrives - reorder buffer is 734 * already ahead and it will be dropped. 735 * If the last sub-frame is not on this queue - we will get frame 736 * release notification with up to date NSSN. 737 */ 738 if (!amsdu || last_subframe) 739 iwl_mvm_release_frames(mvm, sta, napi, buffer, nssn); 740 741 spin_unlock_bh(&buffer->lock); 742 return true; 743 744 drop: 745 kfree_skb(skb); 746 spin_unlock_bh(&buffer->lock); 747 return true; 748 } 749 750 static void iwl_mvm_agg_rx_received(struct iwl_mvm *mvm, 751 u32 reorder_data, u8 baid) 752 { 753 unsigned long now = jiffies; 754 unsigned long timeout; 755 struct iwl_mvm_baid_data *data; 756 757 rcu_read_lock(); 758 759 data = rcu_dereference(mvm->baid_map[baid]); 760 if (!data) { 761 IWL_DEBUG_RX(mvm, 762 "Got valid BAID but no baid allocated, bypass the re-ordering buffer. Baid %d reorder 0x%x\n", 763 baid, reorder_data); 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 (desc->status & cpu_to_le16(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->fwrt, 911 ieee80211_vif_to_wdev(mvmsta->vif), 912 trig); 913 if (trig_check && rx_status->signal < rssi) 914 iwl_fw_dbg_collect_trig(&mvm->fwrt, trig, 915 NULL); 916 } 917 918 if (ieee80211_is_data(hdr->frame_control)) 919 iwl_mvm_rx_csum(sta, skb, desc); 920 921 if (iwl_mvm_is_nonagg_dup(sta, queue, rx_status, hdr, desc)) { 922 kfree_skb(skb); 923 goto out; 924 } 925 926 /* 927 * Our hardware de-aggregates AMSDUs but copies the mac header 928 * as it to the de-aggregated MPDUs. We need to turn off the 929 * AMSDU bit in the QoS control ourselves. 930 * In addition, HW reverses addr3 and addr4 - reverse it back. 931 */ 932 if ((desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU) && 933 !WARN_ON(!ieee80211_is_data_qos(hdr->frame_control))) { 934 int i; 935 u8 *qc = ieee80211_get_qos_ctl(hdr); 936 u8 mac_addr[ETH_ALEN]; 937 938 *qc &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT; 939 940 for (i = 0; i < ETH_ALEN; i++) 941 mac_addr[i] = hdr->addr3[ETH_ALEN - i - 1]; 942 ether_addr_copy(hdr->addr3, mac_addr); 943 944 if (ieee80211_has_a4(hdr->frame_control)) { 945 for (i = 0; i < ETH_ALEN; i++) 946 mac_addr[i] = 947 hdr->addr4[ETH_ALEN - i - 1]; 948 ether_addr_copy(hdr->addr4, mac_addr); 949 } 950 } 951 if (baid != IWL_RX_REORDER_DATA_INVALID_BAID) { 952 u32 reorder_data = le32_to_cpu(desc->reorder_data); 953 954 iwl_mvm_agg_rx_received(mvm, reorder_data, baid); 955 } 956 } 957 958 /* Set up the HT phy flags */ 959 switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) { 960 case RATE_MCS_CHAN_WIDTH_20: 961 break; 962 case RATE_MCS_CHAN_WIDTH_40: 963 rx_status->bw = RATE_INFO_BW_40; 964 break; 965 case RATE_MCS_CHAN_WIDTH_80: 966 rx_status->bw = RATE_INFO_BW_80; 967 break; 968 case RATE_MCS_CHAN_WIDTH_160: 969 rx_status->bw = RATE_INFO_BW_160; 970 break; 971 } 972 if (rate_n_flags & RATE_MCS_SGI_MSK) 973 rx_status->enc_flags |= RX_ENC_FLAG_SHORT_GI; 974 if (rate_n_flags & RATE_HT_MCS_GF_MSK) 975 rx_status->enc_flags |= RX_ENC_FLAG_HT_GF; 976 if (rate_n_flags & RATE_MCS_LDPC_MSK) 977 rx_status->enc_flags |= RX_ENC_FLAG_LDPC; 978 if (rate_n_flags & RATE_MCS_HT_MSK) { 979 u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >> 980 RATE_MCS_STBC_POS; 981 rx_status->encoding = RX_ENC_HT; 982 rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK; 983 rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT; 984 } else if (rate_n_flags & RATE_MCS_VHT_MSK) { 985 u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >> 986 RATE_MCS_STBC_POS; 987 rx_status->nss = 988 ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >> 989 RATE_VHT_MCS_NSS_POS) + 1; 990 rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK; 991 rx_status->encoding = RX_ENC_VHT; 992 rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT; 993 if (rate_n_flags & RATE_MCS_BF_MSK) 994 rx_status->enc_flags |= RX_ENC_FLAG_BF; 995 } else { 996 int rate = iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags, 997 rx_status->band); 998 999 if (WARN(rate < 0 || rate > 0xFF, 1000 "Invalid rate flags 0x%x, band %d,\n", 1001 rate_n_flags, rx_status->band)) { 1002 kfree_skb(skb); 1003 goto out; 1004 } 1005 rx_status->rate_idx = rate; 1006 1007 } 1008 1009 /* management stuff on default queue */ 1010 if (!queue) { 1011 if (unlikely((ieee80211_is_beacon(hdr->frame_control) || 1012 ieee80211_is_probe_resp(hdr->frame_control)) && 1013 mvm->sched_scan_pass_all == 1014 SCHED_SCAN_PASS_ALL_ENABLED)) 1015 mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_FOUND; 1016 1017 if (unlikely(ieee80211_is_beacon(hdr->frame_control) || 1018 ieee80211_is_probe_resp(hdr->frame_control))) 1019 rx_status->boottime_ns = ktime_get_boot_ns(); 1020 } 1021 1022 iwl_mvm_create_skb(skb, hdr, len, crypt_len, rxb); 1023 if (!iwl_mvm_reorder(mvm, napi, queue, sta, skb, desc)) 1024 iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb, queue, sta); 1025 out: 1026 rcu_read_unlock(); 1027 } 1028 1029 void iwl_mvm_rx_frame_release(struct iwl_mvm *mvm, struct napi_struct *napi, 1030 struct iwl_rx_cmd_buffer *rxb, int queue) 1031 { 1032 struct iwl_rx_packet *pkt = rxb_addr(rxb); 1033 struct iwl_frame_release *release = (void *)pkt->data; 1034 struct ieee80211_sta *sta; 1035 struct iwl_mvm_reorder_buffer *reorder_buf; 1036 struct iwl_mvm_baid_data *ba_data; 1037 1038 int baid = release->baid; 1039 1040 IWL_DEBUG_HT(mvm, "Frame release notification for BAID %u, NSSN %d\n", 1041 release->baid, le16_to_cpu(release->nssn)); 1042 1043 if (WARN_ON_ONCE(baid == IWL_RX_REORDER_DATA_INVALID_BAID)) 1044 return; 1045 1046 rcu_read_lock(); 1047 1048 ba_data = rcu_dereference(mvm->baid_map[baid]); 1049 if (WARN_ON_ONCE(!ba_data)) 1050 goto out; 1051 1052 sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]); 1053 if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) 1054 goto out; 1055 1056 reorder_buf = &ba_data->reorder_buf[queue]; 1057 1058 spin_lock_bh(&reorder_buf->lock); 1059 iwl_mvm_release_frames(mvm, sta, napi, reorder_buf, 1060 le16_to_cpu(release->nssn)); 1061 spin_unlock_bh(&reorder_buf->lock); 1062 1063 out: 1064 rcu_read_unlock(); 1065 } 1066