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 skb_put_data(skb, hdr, hdrlen); 187 skb_put_data(skb, (u8 *)hdr + hdrlen + pad_len, headlen - hdrlen); 188 189 fraglen = len - headlen; 190 191 if (fraglen) { 192 int offset = (void *)hdr + headlen + pad_len - 193 rxb_addr(rxb) + rxb_offset(rxb); 194 195 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset, 196 fraglen, rxb->truesize); 197 } 198 } 199 200 /* iwl_mvm_pass_packet_to_mac80211 - passes the packet for mac80211 */ 201 static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm, 202 struct napi_struct *napi, 203 struct sk_buff *skb, int queue, 204 struct ieee80211_sta *sta) 205 { 206 if (iwl_mvm_check_pn(mvm, skb, queue, sta)) 207 kfree_skb(skb); 208 else 209 ieee80211_rx_napi(mvm->hw, sta, skb, napi); 210 } 211 212 static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm, 213 struct iwl_rx_mpdu_desc *desc, 214 struct ieee80211_rx_status *rx_status) 215 { 216 int energy_a, energy_b, max_energy; 217 218 energy_a = desc->energy_a; 219 energy_a = energy_a ? -energy_a : S8_MIN; 220 energy_b = desc->energy_b; 221 energy_b = energy_b ? -energy_b : S8_MIN; 222 max_energy = max(energy_a, energy_b); 223 224 IWL_DEBUG_STATS(mvm, "energy In A %d B %d, and max %d\n", 225 energy_a, energy_b, max_energy); 226 227 rx_status->signal = max_energy; 228 rx_status->chains = 0; /* TODO: phy info */ 229 rx_status->chain_signal[0] = energy_a; 230 rx_status->chain_signal[1] = energy_b; 231 rx_status->chain_signal[2] = S8_MIN; 232 } 233 234 static int iwl_mvm_rx_crypto(struct iwl_mvm *mvm, struct ieee80211_hdr *hdr, 235 struct ieee80211_rx_status *stats, 236 struct iwl_rx_mpdu_desc *desc, int queue, 237 u8 *crypt_len) 238 { 239 u16 status = le16_to_cpu(desc->status); 240 241 if (!ieee80211_has_protected(hdr->frame_control) || 242 (status & IWL_RX_MPDU_STATUS_SEC_MASK) == 243 IWL_RX_MPDU_STATUS_SEC_NONE) 244 return 0; 245 246 /* TODO: handle packets encrypted with unknown alg */ 247 248 switch (status & IWL_RX_MPDU_STATUS_SEC_MASK) { 249 case IWL_RX_MPDU_STATUS_SEC_CCM: 250 case IWL_RX_MPDU_STATUS_SEC_GCM: 251 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN != IEEE80211_GCMP_PN_LEN); 252 /* alg is CCM: check MIC only */ 253 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK)) 254 return -1; 255 256 stats->flag |= RX_FLAG_DECRYPTED; 257 *crypt_len = IEEE80211_CCMP_HDR_LEN; 258 return 0; 259 case IWL_RX_MPDU_STATUS_SEC_TKIP: 260 /* Don't drop the frame and decrypt it in SW */ 261 if (!(status & IWL_RX_MPDU_RES_STATUS_TTAK_OK)) 262 return 0; 263 264 *crypt_len = IEEE80211_TKIP_IV_LEN; 265 /* fall through if TTAK OK */ 266 case IWL_RX_MPDU_STATUS_SEC_WEP: 267 if (!(status & IWL_RX_MPDU_STATUS_ICV_OK)) 268 return -1; 269 270 stats->flag |= RX_FLAG_DECRYPTED; 271 if ((status & IWL_RX_MPDU_STATUS_SEC_MASK) == 272 IWL_RX_MPDU_STATUS_SEC_WEP) 273 *crypt_len = IEEE80211_WEP_IV_LEN; 274 return 0; 275 case IWL_RX_MPDU_STATUS_SEC_EXT_ENC: 276 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK)) 277 return -1; 278 stats->flag |= RX_FLAG_DECRYPTED; 279 return 0; 280 default: 281 IWL_ERR(mvm, "Unhandled alg: 0x%x\n", status); 282 } 283 284 return 0; 285 } 286 287 static void iwl_mvm_rx_csum(struct ieee80211_sta *sta, 288 struct sk_buff *skb, 289 struct iwl_rx_mpdu_desc *desc) 290 { 291 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 292 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif); 293 u16 flags = le16_to_cpu(desc->l3l4_flags); 294 u8 l3_prot = (u8)((flags & IWL_RX_L3L4_L3_PROTO_MASK) >> 295 IWL_RX_L3_PROTO_POS); 296 297 if (mvmvif->features & NETIF_F_RXCSUM && 298 flags & IWL_RX_L3L4_TCP_UDP_CSUM_OK && 299 (flags & IWL_RX_L3L4_IP_HDR_CSUM_OK || 300 l3_prot == IWL_RX_L3_TYPE_IPV6 || 301 l3_prot == IWL_RX_L3_TYPE_IPV6_FRAG)) 302 skb->ip_summed = CHECKSUM_UNNECESSARY; 303 } 304 305 /* 306 * returns true if a packet outside BA session is a duplicate and 307 * should be dropped 308 */ 309 static bool iwl_mvm_is_nonagg_dup(struct ieee80211_sta *sta, int queue, 310 struct ieee80211_rx_status *rx_status, 311 struct ieee80211_hdr *hdr, 312 struct iwl_rx_mpdu_desc *desc) 313 { 314 struct iwl_mvm_sta *mvm_sta; 315 struct iwl_mvm_rxq_dup_data *dup_data; 316 u8 baid, tid, sub_frame_idx; 317 318 if (WARN_ON(IS_ERR_OR_NULL(sta))) 319 return false; 320 321 baid = (le32_to_cpu(desc->reorder_data) & 322 IWL_RX_MPDU_REORDER_BAID_MASK) >> 323 IWL_RX_MPDU_REORDER_BAID_SHIFT; 324 325 if (baid != IWL_RX_REORDER_DATA_INVALID_BAID) 326 return false; 327 328 mvm_sta = iwl_mvm_sta_from_mac80211(sta); 329 dup_data = &mvm_sta->dup_data[queue]; 330 331 /* 332 * Drop duplicate 802.11 retransmissions 333 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery") 334 */ 335 if (ieee80211_is_ctl(hdr->frame_control) || 336 ieee80211_is_qos_nullfunc(hdr->frame_control) || 337 is_multicast_ether_addr(hdr->addr1)) { 338 rx_status->flag |= RX_FLAG_DUP_VALIDATED; 339 return false; 340 } 341 342 if (ieee80211_is_data_qos(hdr->frame_control)) 343 /* frame has qos control */ 344 tid = *ieee80211_get_qos_ctl(hdr) & 345 IEEE80211_QOS_CTL_TID_MASK; 346 else 347 tid = IWL_MAX_TID_COUNT; 348 349 /* If this wasn't a part of an A-MSDU the sub-frame index will be 0 */ 350 sub_frame_idx = desc->amsdu_info & IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK; 351 352 if (unlikely(ieee80211_has_retry(hdr->frame_control) && 353 dup_data->last_seq[tid] == hdr->seq_ctrl && 354 dup_data->last_sub_frame[tid] >= sub_frame_idx)) 355 return true; 356 357 dup_data->last_seq[tid] = hdr->seq_ctrl; 358 dup_data->last_sub_frame[tid] = sub_frame_idx; 359 360 rx_status->flag |= RX_FLAG_DUP_VALIDATED; 361 362 return false; 363 } 364 365 int iwl_mvm_notify_rx_queue(struct iwl_mvm *mvm, u32 rxq_mask, 366 const u8 *data, u32 count) 367 { 368 struct iwl_rxq_sync_cmd *cmd; 369 u32 data_size = sizeof(*cmd) + count; 370 int ret; 371 372 /* should be DWORD aligned */ 373 if (WARN_ON(count & 3 || count > IWL_MULTI_QUEUE_SYNC_MSG_MAX_SIZE)) 374 return -EINVAL; 375 376 cmd = kzalloc(data_size, GFP_KERNEL); 377 if (!cmd) 378 return -ENOMEM; 379 380 cmd->rxq_mask = cpu_to_le32(rxq_mask); 381 cmd->count = cpu_to_le32(count); 382 cmd->flags = 0; 383 memcpy(cmd->payload, data, count); 384 385 ret = iwl_mvm_send_cmd_pdu(mvm, 386 WIDE_ID(DATA_PATH_GROUP, 387 TRIGGER_RX_QUEUES_NOTIF_CMD), 388 0, data_size, cmd); 389 390 kfree(cmd); 391 return ret; 392 } 393 394 /* 395 * Returns true if sn2 - buffer_size < sn1 < sn2. 396 * To be used only in order to compare reorder buffer head with NSSN. 397 * We fully trust NSSN unless it is behind us due to reorder timeout. 398 * Reorder timeout can only bring us up to buffer_size SNs ahead of NSSN. 399 */ 400 static bool iwl_mvm_is_sn_less(u16 sn1, u16 sn2, u16 buffer_size) 401 { 402 return ieee80211_sn_less(sn1, sn2) && 403 !ieee80211_sn_less(sn1, sn2 - buffer_size); 404 } 405 406 #define RX_REORDER_BUF_TIMEOUT_MQ (HZ / 10) 407 408 static void iwl_mvm_release_frames(struct iwl_mvm *mvm, 409 struct ieee80211_sta *sta, 410 struct napi_struct *napi, 411 struct iwl_mvm_reorder_buffer *reorder_buf, 412 u16 nssn) 413 { 414 u16 ssn = reorder_buf->head_sn; 415 416 lockdep_assert_held(&reorder_buf->lock); 417 418 /* ignore nssn smaller than head sn - this can happen due to timeout */ 419 if (iwl_mvm_is_sn_less(nssn, ssn, reorder_buf->buf_size)) 420 goto set_timer; 421 422 while (iwl_mvm_is_sn_less(ssn, nssn, reorder_buf->buf_size)) { 423 int index = ssn % reorder_buf->buf_size; 424 struct sk_buff_head *skb_list = &reorder_buf->entries[index]; 425 struct sk_buff *skb; 426 427 ssn = ieee80211_sn_inc(ssn); 428 429 /* 430 * Empty the list. Will have more than one frame for A-MSDU. 431 * Empty list is valid as well since nssn indicates frames were 432 * received. 433 */ 434 while ((skb = __skb_dequeue(skb_list))) { 435 iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb, 436 reorder_buf->queue, 437 sta); 438 reorder_buf->num_stored--; 439 } 440 } 441 reorder_buf->head_sn = nssn; 442 443 set_timer: 444 if (reorder_buf->num_stored && !reorder_buf->removed) { 445 u16 index = reorder_buf->head_sn % reorder_buf->buf_size; 446 447 while (skb_queue_empty(&reorder_buf->entries[index])) 448 index = (index + 1) % reorder_buf->buf_size; 449 /* modify timer to match next frame's expiration time */ 450 mod_timer(&reorder_buf->reorder_timer, 451 reorder_buf->reorder_time[index] + 1 + 452 RX_REORDER_BUF_TIMEOUT_MQ); 453 } else { 454 del_timer(&reorder_buf->reorder_timer); 455 } 456 } 457 458 void iwl_mvm_reorder_timer_expired(unsigned long data) 459 { 460 struct iwl_mvm_reorder_buffer *buf = (void *)data; 461 int i; 462 u16 sn = 0, index = 0; 463 bool expired = false; 464 bool cont = false; 465 466 spin_lock(&buf->lock); 467 468 if (!buf->num_stored || buf->removed) { 469 spin_unlock(&buf->lock); 470 return; 471 } 472 473 for (i = 0; i < buf->buf_size ; i++) { 474 index = (buf->head_sn + i) % buf->buf_size; 475 476 if (skb_queue_empty(&buf->entries[index])) { 477 /* 478 * If there is a hole and the next frame didn't expire 479 * we want to break and not advance SN 480 */ 481 cont = false; 482 continue; 483 } 484 if (!cont && !time_after(jiffies, buf->reorder_time[index] + 485 RX_REORDER_BUF_TIMEOUT_MQ)) 486 break; 487 488 expired = true; 489 /* continue until next hole after this expired frames */ 490 cont = true; 491 sn = ieee80211_sn_add(buf->head_sn, i + 1); 492 } 493 494 if (expired) { 495 struct ieee80211_sta *sta; 496 497 rcu_read_lock(); 498 sta = rcu_dereference(buf->mvm->fw_id_to_mac_id[buf->sta_id]); 499 /* SN is set to the last expired frame + 1 */ 500 IWL_DEBUG_HT(buf->mvm, 501 "Releasing expired frames for sta %u, sn %d\n", 502 buf->sta_id, sn); 503 iwl_mvm_release_frames(buf->mvm, sta, NULL, buf, sn); 504 rcu_read_unlock(); 505 } else { 506 /* 507 * If no frame expired and there are stored frames, index is now 508 * pointing to the first unexpired frame - modify timer 509 * accordingly to this frame. 510 */ 511 mod_timer(&buf->reorder_timer, 512 buf->reorder_time[index] + 513 1 + RX_REORDER_BUF_TIMEOUT_MQ); 514 } 515 spin_unlock(&buf->lock); 516 } 517 518 static void iwl_mvm_del_ba(struct iwl_mvm *mvm, int queue, 519 struct iwl_mvm_delba_data *data) 520 { 521 struct iwl_mvm_baid_data *ba_data; 522 struct ieee80211_sta *sta; 523 struct iwl_mvm_reorder_buffer *reorder_buf; 524 u8 baid = data->baid; 525 526 if (WARN_ONCE(baid >= IWL_MAX_BAID, "invalid BAID: %x\n", baid)) 527 return; 528 529 rcu_read_lock(); 530 531 ba_data = rcu_dereference(mvm->baid_map[baid]); 532 if (WARN_ON_ONCE(!ba_data)) 533 goto out; 534 535 sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]); 536 if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) 537 goto out; 538 539 reorder_buf = &ba_data->reorder_buf[queue]; 540 541 /* release all frames that are in the reorder buffer to the stack */ 542 spin_lock_bh(&reorder_buf->lock); 543 iwl_mvm_release_frames(mvm, sta, NULL, reorder_buf, 544 ieee80211_sn_add(reorder_buf->head_sn, 545 reorder_buf->buf_size)); 546 spin_unlock_bh(&reorder_buf->lock); 547 del_timer_sync(&reorder_buf->reorder_timer); 548 549 out: 550 rcu_read_unlock(); 551 } 552 553 void iwl_mvm_rx_queue_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb, 554 int queue) 555 { 556 struct iwl_rx_packet *pkt = rxb_addr(rxb); 557 struct iwl_rxq_sync_notification *notif; 558 struct iwl_mvm_internal_rxq_notif *internal_notif; 559 560 notif = (void *)pkt->data; 561 internal_notif = (void *)notif->payload; 562 563 if (internal_notif->sync) { 564 if (mvm->queue_sync_cookie != internal_notif->cookie) { 565 WARN_ONCE(1, 566 "Received expired RX queue sync message\n"); 567 return; 568 } 569 if (!atomic_dec_return(&mvm->queue_sync_counter)) 570 wake_up(&mvm->rx_sync_waitq); 571 } 572 573 switch (internal_notif->type) { 574 case IWL_MVM_RXQ_EMPTY: 575 break; 576 case IWL_MVM_RXQ_NOTIF_DEL_BA: 577 iwl_mvm_del_ba(mvm, queue, (void *)internal_notif->data); 578 break; 579 default: 580 WARN_ONCE(1, "Invalid identifier %d", internal_notif->type); 581 } 582 } 583 584 /* 585 * Returns true if the MPDU was buffered\dropped, false if it should be passed 586 * to upper layer. 587 */ 588 static bool iwl_mvm_reorder(struct iwl_mvm *mvm, 589 struct napi_struct *napi, 590 int queue, 591 struct ieee80211_sta *sta, 592 struct sk_buff *skb, 593 struct iwl_rx_mpdu_desc *desc) 594 { 595 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 596 struct iwl_mvm_sta *mvm_sta; 597 struct iwl_mvm_baid_data *baid_data; 598 struct iwl_mvm_reorder_buffer *buffer; 599 struct sk_buff *tail; 600 u32 reorder = le32_to_cpu(desc->reorder_data); 601 bool amsdu = desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU; 602 bool last_subframe = 603 desc->amsdu_info & IWL_RX_MPDU_AMSDU_LAST_SUBFRAME; 604 u8 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; 605 u8 sub_frame_idx = desc->amsdu_info & 606 IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK; 607 int index; 608 u16 nssn, sn; 609 u8 baid; 610 611 baid = (reorder & IWL_RX_MPDU_REORDER_BAID_MASK) >> 612 IWL_RX_MPDU_REORDER_BAID_SHIFT; 613 614 /* 615 * This also covers the case of receiving a Block Ack Request 616 * outside a BA session; we'll pass it to mac80211 and that 617 * then sends a delBA action frame. 618 */ 619 if (baid == IWL_RX_REORDER_DATA_INVALID_BAID) 620 return false; 621 622 /* no sta yet */ 623 if (WARN_ON(IS_ERR_OR_NULL(sta))) 624 return false; 625 626 mvm_sta = iwl_mvm_sta_from_mac80211(sta); 627 628 /* not a data packet or a bar */ 629 if (!ieee80211_is_back_req(hdr->frame_control) && 630 (!ieee80211_is_data_qos(hdr->frame_control) || 631 is_multicast_ether_addr(hdr->addr1))) 632 return false; 633 634 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) 635 return false; 636 637 baid_data = rcu_dereference(mvm->baid_map[baid]); 638 if (!baid_data) { 639 IWL_DEBUG_RX(mvm, 640 "Got valid BAID but no baid allocated, bypass the re-ordering buffer. Baid %d reorder 0x%x\n", 641 baid, reorder); 642 return false; 643 } 644 645 if (WARN(tid != baid_data->tid || mvm_sta->sta_id != baid_data->sta_id, 646 "baid 0x%x is mapped to sta:%d tid:%d, but was received for sta:%d tid:%d\n", 647 baid, baid_data->sta_id, baid_data->tid, mvm_sta->sta_id, 648 tid)) 649 return false; 650 651 nssn = reorder & IWL_RX_MPDU_REORDER_NSSN_MASK; 652 sn = (reorder & IWL_RX_MPDU_REORDER_SN_MASK) >> 653 IWL_RX_MPDU_REORDER_SN_SHIFT; 654 655 buffer = &baid_data->reorder_buf[queue]; 656 657 spin_lock_bh(&buffer->lock); 658 659 if (!buffer->valid) { 660 if (reorder & IWL_RX_MPDU_REORDER_BA_OLD_SN) { 661 spin_unlock_bh(&buffer->lock); 662 return false; 663 } 664 buffer->valid = true; 665 } 666 667 if (ieee80211_is_back_req(hdr->frame_control)) { 668 iwl_mvm_release_frames(mvm, sta, napi, buffer, nssn); 669 goto drop; 670 } 671 672 /* 673 * If there was a significant jump in the nssn - adjust. 674 * If the SN is smaller than the NSSN it might need to first go into 675 * the reorder buffer, in which case we just release up to it and the 676 * rest of the function will take of storing it and releasing up to the 677 * nssn 678 */ 679 if (!iwl_mvm_is_sn_less(nssn, buffer->head_sn + buffer->buf_size, 680 buffer->buf_size)) { 681 u16 min_sn = ieee80211_sn_less(sn, nssn) ? sn : nssn; 682 683 iwl_mvm_release_frames(mvm, sta, napi, buffer, min_sn); 684 } 685 686 /* drop any oudated packets */ 687 if (ieee80211_sn_less(sn, buffer->head_sn)) 688 goto drop; 689 690 /* release immediately if allowed by nssn and no stored frames */ 691 if (!buffer->num_stored && ieee80211_sn_less(sn, nssn)) { 692 if (iwl_mvm_is_sn_less(buffer->head_sn, nssn, 693 buffer->buf_size) && 694 (!amsdu || last_subframe)) 695 buffer->head_sn = nssn; 696 /* No need to update AMSDU last SN - we are moving the head */ 697 spin_unlock_bh(&buffer->lock); 698 return false; 699 } 700 701 index = sn % buffer->buf_size; 702 703 /* 704 * Check if we already stored this frame 705 * As AMSDU is either received or not as whole, logic is simple: 706 * If we have frames in that position in the buffer and the last frame 707 * originated from AMSDU had a different SN then it is a retransmission. 708 * If it is the same SN then if the subframe index is incrementing it 709 * is the same AMSDU - otherwise it is a retransmission. 710 */ 711 tail = skb_peek_tail(&buffer->entries[index]); 712 if (tail && !amsdu) 713 goto drop; 714 else if (tail && (sn != buffer->last_amsdu || 715 buffer->last_sub_index >= sub_frame_idx)) 716 goto drop; 717 718 /* put in reorder buffer */ 719 __skb_queue_tail(&buffer->entries[index], skb); 720 buffer->num_stored++; 721 buffer->reorder_time[index] = jiffies; 722 723 if (amsdu) { 724 buffer->last_amsdu = sn; 725 buffer->last_sub_index = sub_frame_idx; 726 } 727 728 /* 729 * We cannot trust NSSN for AMSDU sub-frames that are not the last. 730 * The reason is that NSSN advances on the first sub-frame, and may 731 * cause the reorder buffer to advance before all the sub-frames arrive. 732 * Example: reorder buffer contains SN 0 & 2, and we receive AMSDU with 733 * SN 1. NSSN for first sub frame will be 3 with the result of driver 734 * releasing SN 0,1, 2. When sub-frame 1 arrives - reorder buffer is 735 * already ahead and it will be dropped. 736 * If the last sub-frame is not on this queue - we will get frame 737 * release notification with up to date NSSN. 738 */ 739 if (!amsdu || last_subframe) 740 iwl_mvm_release_frames(mvm, sta, napi, buffer, nssn); 741 742 spin_unlock_bh(&buffer->lock); 743 return true; 744 745 drop: 746 kfree_skb(skb); 747 spin_unlock_bh(&buffer->lock); 748 return true; 749 } 750 751 static void iwl_mvm_agg_rx_received(struct iwl_mvm *mvm, 752 u32 reorder_data, u8 baid) 753 { 754 unsigned long now = jiffies; 755 unsigned long timeout; 756 struct iwl_mvm_baid_data *data; 757 758 rcu_read_lock(); 759 760 data = rcu_dereference(mvm->baid_map[baid]); 761 if (!data) { 762 IWL_DEBUG_RX(mvm, 763 "Got valid BAID but no baid allocated, bypass the re-ordering buffer. Baid %d reorder 0x%x\n", 764 baid, reorder_data); 765 goto out; 766 } 767 768 if (!data->timeout) 769 goto out; 770 771 timeout = data->timeout; 772 /* 773 * Do not update last rx all the time to avoid cache bouncing 774 * between the rx queues. 775 * Update it every timeout. Worst case is the session will 776 * expire after ~ 2 * timeout, which doesn't matter that much. 777 */ 778 if (time_before(data->last_rx + TU_TO_JIFFIES(timeout), now)) 779 /* Update is atomic */ 780 data->last_rx = now; 781 782 out: 783 rcu_read_unlock(); 784 } 785 786 void iwl_mvm_rx_mpdu_mq(struct iwl_mvm *mvm, struct napi_struct *napi, 787 struct iwl_rx_cmd_buffer *rxb, int queue) 788 { 789 struct ieee80211_rx_status *rx_status; 790 struct iwl_rx_packet *pkt = rxb_addr(rxb); 791 struct iwl_rx_mpdu_desc *desc = (void *)pkt->data; 792 struct ieee80211_hdr *hdr = (void *)(pkt->data + sizeof(*desc)); 793 u32 len = le16_to_cpu(desc->mpdu_len); 794 u32 rate_n_flags = le32_to_cpu(desc->rate_n_flags); 795 u16 phy_info = le16_to_cpu(desc->phy_info); 796 struct ieee80211_sta *sta = NULL; 797 struct sk_buff *skb; 798 u8 crypt_len = 0; 799 800 /* Dont use dev_alloc_skb(), we'll have enough headroom once 801 * ieee80211_hdr pulled. 802 */ 803 skb = alloc_skb(128, GFP_ATOMIC); 804 if (!skb) { 805 IWL_ERR(mvm, "alloc_skb failed\n"); 806 return; 807 } 808 809 rx_status = IEEE80211_SKB_RXCB(skb); 810 811 if (iwl_mvm_rx_crypto(mvm, hdr, rx_status, desc, queue, &crypt_len)) { 812 kfree_skb(skb); 813 return; 814 } 815 816 /* 817 * Keep packets with CRC errors (and with overrun) for monitor mode 818 * (otherwise the firmware discards them) but mark them as bad. 819 */ 820 if (!(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_CRC_OK)) || 821 !(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_OVERRUN_OK))) { 822 IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n", 823 le16_to_cpu(desc->status)); 824 rx_status->flag |= RX_FLAG_FAILED_FCS_CRC; 825 } 826 /* set the preamble flag if appropriate */ 827 if (phy_info & IWL_RX_MPDU_PHY_SHORT_PREAMBLE) 828 rx_status->enc_flags |= RX_ENC_FLAG_SHORTPRE; 829 830 if (likely(!(phy_info & IWL_RX_MPDU_PHY_TSF_OVERLOAD))) { 831 rx_status->mactime = le64_to_cpu(desc->tsf_on_air_rise); 832 /* TSF as indicated by the firmware is at INA time */ 833 rx_status->flag |= RX_FLAG_MACTIME_PLCP_START; 834 } 835 rx_status->device_timestamp = le32_to_cpu(desc->gp2_on_air_rise); 836 rx_status->band = desc->channel > 14 ? NL80211_BAND_5GHZ : 837 NL80211_BAND_2GHZ; 838 rx_status->freq = ieee80211_channel_to_frequency(desc->channel, 839 rx_status->band); 840 iwl_mvm_get_signal_strength(mvm, desc, rx_status); 841 842 /* update aggregation data for monitor sake on default queue */ 843 if (!queue && (phy_info & IWL_RX_MPDU_PHY_AMPDU)) { 844 bool toggle_bit = phy_info & IWL_RX_MPDU_PHY_AMPDU_TOGGLE; 845 846 rx_status->flag |= RX_FLAG_AMPDU_DETAILS; 847 rx_status->ampdu_reference = mvm->ampdu_ref; 848 /* toggle is switched whenever new aggregation starts */ 849 if (toggle_bit != mvm->ampdu_toggle) { 850 mvm->ampdu_ref++; 851 mvm->ampdu_toggle = toggle_bit; 852 } 853 } 854 855 rcu_read_lock(); 856 857 if (le16_to_cpu(desc->status) & IWL_RX_MPDU_STATUS_SRC_STA_FOUND) { 858 u8 id = desc->sta_id_flags & IWL_RX_MPDU_SIF_STA_ID_MASK; 859 860 if (!WARN_ON_ONCE(id >= ARRAY_SIZE(mvm->fw_id_to_mac_id))) { 861 sta = rcu_dereference(mvm->fw_id_to_mac_id[id]); 862 if (IS_ERR(sta)) 863 sta = NULL; 864 } 865 } else if (!is_multicast_ether_addr(hdr->addr2)) { 866 /* 867 * This is fine since we prevent two stations with the same 868 * address from being added. 869 */ 870 sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL); 871 } 872 873 if (sta) { 874 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 875 struct ieee80211_vif *tx_blocked_vif = 876 rcu_dereference(mvm->csa_tx_blocked_vif); 877 u8 baid = (u8)((le32_to_cpu(desc->reorder_data) & 878 IWL_RX_MPDU_REORDER_BAID_MASK) >> 879 IWL_RX_MPDU_REORDER_BAID_SHIFT); 880 881 /* 882 * We have tx blocked stations (with CS bit). If we heard 883 * frames from a blocked station on a new channel we can 884 * TX to it again. 885 */ 886 if (unlikely(tx_blocked_vif) && 887 tx_blocked_vif == mvmsta->vif) { 888 struct iwl_mvm_vif *mvmvif = 889 iwl_mvm_vif_from_mac80211(tx_blocked_vif); 890 891 if (mvmvif->csa_target_freq == rx_status->freq) 892 iwl_mvm_sta_modify_disable_tx_ap(mvm, sta, 893 false); 894 } 895 896 rs_update_last_rssi(mvm, &mvmsta->lq_sta, rx_status); 897 898 if (iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_RSSI) && 899 ieee80211_is_beacon(hdr->frame_control)) { 900 struct iwl_fw_dbg_trigger_tlv *trig; 901 struct iwl_fw_dbg_trigger_low_rssi *rssi_trig; 902 bool trig_check; 903 s32 rssi; 904 905 trig = iwl_fw_dbg_get_trigger(mvm->fw, 906 FW_DBG_TRIGGER_RSSI); 907 rssi_trig = (void *)trig->data; 908 rssi = le32_to_cpu(rssi_trig->rssi); 909 910 trig_check = 911 iwl_fw_dbg_trigger_check_stop(mvm, mvmsta->vif, 912 trig); 913 if (trig_check && rx_status->signal < rssi) 914 iwl_mvm_fw_dbg_collect_trig(mvm, trig, NULL); 915 } 916 917 if (ieee80211_is_data(hdr->frame_control)) 918 iwl_mvm_rx_csum(sta, skb, desc); 919 920 if (iwl_mvm_is_nonagg_dup(sta, queue, rx_status, hdr, desc)) { 921 kfree_skb(skb); 922 goto out; 923 } 924 925 /* 926 * Our hardware de-aggregates AMSDUs but copies the mac header 927 * as it to the de-aggregated MPDUs. We need to turn off the 928 * AMSDU bit in the QoS control ourselves. 929 * In addition, HW reverses addr3 and addr4 - reverse it back. 930 */ 931 if ((desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU) && 932 !WARN_ON(!ieee80211_is_data_qos(hdr->frame_control))) { 933 int i; 934 u8 *qc = ieee80211_get_qos_ctl(hdr); 935 u8 mac_addr[ETH_ALEN]; 936 937 *qc &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT; 938 939 for (i = 0; i < ETH_ALEN; i++) 940 mac_addr[i] = hdr->addr3[ETH_ALEN - i - 1]; 941 ether_addr_copy(hdr->addr3, mac_addr); 942 943 if (ieee80211_has_a4(hdr->frame_control)) { 944 for (i = 0; i < ETH_ALEN; i++) 945 mac_addr[i] = 946 hdr->addr4[ETH_ALEN - i - 1]; 947 ether_addr_copy(hdr->addr4, mac_addr); 948 } 949 } 950 if (baid != IWL_RX_REORDER_DATA_INVALID_BAID) { 951 u32 reorder_data = le32_to_cpu(desc->reorder_data); 952 953 iwl_mvm_agg_rx_received(mvm, reorder_data, baid); 954 } 955 } 956 957 /* Set up the HT phy flags */ 958 switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) { 959 case RATE_MCS_CHAN_WIDTH_20: 960 break; 961 case RATE_MCS_CHAN_WIDTH_40: 962 rx_status->bw = RATE_INFO_BW_40; 963 break; 964 case RATE_MCS_CHAN_WIDTH_80: 965 rx_status->bw = RATE_INFO_BW_80; 966 break; 967 case RATE_MCS_CHAN_WIDTH_160: 968 rx_status->bw = RATE_INFO_BW_160; 969 break; 970 } 971 if (rate_n_flags & RATE_MCS_SGI_MSK) 972 rx_status->enc_flags |= RX_ENC_FLAG_SHORT_GI; 973 if (rate_n_flags & RATE_HT_MCS_GF_MSK) 974 rx_status->enc_flags |= RX_ENC_FLAG_HT_GF; 975 if (rate_n_flags & RATE_MCS_LDPC_MSK) 976 rx_status->enc_flags |= RX_ENC_FLAG_LDPC; 977 if (rate_n_flags & RATE_MCS_HT_MSK) { 978 u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >> 979 RATE_MCS_STBC_POS; 980 rx_status->encoding = RX_ENC_HT; 981 rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK; 982 rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT; 983 } else if (rate_n_flags & RATE_MCS_VHT_MSK) { 984 u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >> 985 RATE_MCS_STBC_POS; 986 rx_status->nss = 987 ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >> 988 RATE_VHT_MCS_NSS_POS) + 1; 989 rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK; 990 rx_status->encoding = RX_ENC_VHT; 991 rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT; 992 if (rate_n_flags & RATE_MCS_BF_MSK) 993 rx_status->enc_flags |= RX_ENC_FLAG_BF; 994 } else { 995 int rate = iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags, 996 rx_status->band); 997 998 if (WARN(rate < 0 || rate > 0xFF, 999 "Invalid rate flags 0x%x, band %d,\n", 1000 rate_n_flags, rx_status->band)) { 1001 kfree_skb(skb); 1002 goto out; 1003 } 1004 rx_status->rate_idx = rate; 1005 1006 } 1007 1008 /* management stuff on default queue */ 1009 if (!queue) { 1010 if (unlikely((ieee80211_is_beacon(hdr->frame_control) || 1011 ieee80211_is_probe_resp(hdr->frame_control)) && 1012 mvm->sched_scan_pass_all == 1013 SCHED_SCAN_PASS_ALL_ENABLED)) 1014 mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_FOUND; 1015 1016 if (unlikely(ieee80211_is_beacon(hdr->frame_control) || 1017 ieee80211_is_probe_resp(hdr->frame_control))) 1018 rx_status->boottime_ns = ktime_get_boot_ns(); 1019 } 1020 1021 iwl_mvm_create_skb(skb, hdr, len, crypt_len, rxb); 1022 if (!iwl_mvm_reorder(mvm, napi, queue, sta, skb, desc)) 1023 iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb, queue, sta); 1024 out: 1025 rcu_read_unlock(); 1026 } 1027 1028 void iwl_mvm_rx_frame_release(struct iwl_mvm *mvm, struct napi_struct *napi, 1029 struct iwl_rx_cmd_buffer *rxb, int queue) 1030 { 1031 struct iwl_rx_packet *pkt = rxb_addr(rxb); 1032 struct iwl_frame_release *release = (void *)pkt->data; 1033 struct ieee80211_sta *sta; 1034 struct iwl_mvm_reorder_buffer *reorder_buf; 1035 struct iwl_mvm_baid_data *ba_data; 1036 1037 int baid = release->baid; 1038 1039 IWL_DEBUG_HT(mvm, "Frame release notification for BAID %u, NSSN %d\n", 1040 release->baid, le16_to_cpu(release->nssn)); 1041 1042 if (WARN_ON_ONCE(baid == IWL_RX_REORDER_DATA_INVALID_BAID)) 1043 return; 1044 1045 rcu_read_lock(); 1046 1047 ba_data = rcu_dereference(mvm->baid_map[baid]); 1048 if (WARN_ON_ONCE(!ba_data)) 1049 goto out; 1050 1051 sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]); 1052 if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) 1053 goto out; 1054 1055 reorder_buf = &ba_data->reorder_buf[queue]; 1056 1057 spin_lock_bh(&reorder_buf->lock); 1058 iwl_mvm_release_frames(mvm, sta, napi, reorder_buf, 1059 le16_to_cpu(release->nssn)); 1060 spin_unlock_bh(&reorder_buf->lock); 1061 1062 out: 1063 rcu_read_unlock(); 1064 } 1065