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_baid_data *baid_data, 413 struct iwl_mvm_reorder_buffer *reorder_buf, 414 u16 nssn) 415 { 416 struct iwl_mvm_reorder_buf_entry *entries = 417 &baid_data->entries[reorder_buf->queue * 418 baid_data->entries_per_queue]; 419 u16 ssn = reorder_buf->head_sn; 420 421 lockdep_assert_held(&reorder_buf->lock); 422 423 /* ignore nssn smaller than head sn - this can happen due to timeout */ 424 if (iwl_mvm_is_sn_less(nssn, ssn, reorder_buf->buf_size)) 425 goto set_timer; 426 427 while (iwl_mvm_is_sn_less(ssn, nssn, reorder_buf->buf_size)) { 428 int index = ssn % reorder_buf->buf_size; 429 struct sk_buff_head *skb_list = &entries[index].e.frames; 430 struct sk_buff *skb; 431 432 ssn = ieee80211_sn_inc(ssn); 433 434 /* 435 * Empty the list. Will have more than one frame for A-MSDU. 436 * Empty list is valid as well since nssn indicates frames were 437 * received. 438 */ 439 while ((skb = __skb_dequeue(skb_list))) { 440 iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb, 441 reorder_buf->queue, 442 sta); 443 reorder_buf->num_stored--; 444 } 445 } 446 reorder_buf->head_sn = nssn; 447 448 set_timer: 449 if (reorder_buf->num_stored && !reorder_buf->removed) { 450 u16 index = reorder_buf->head_sn % reorder_buf->buf_size; 451 452 while (skb_queue_empty(&entries[index].e.frames)) 453 index = (index + 1) % reorder_buf->buf_size; 454 /* modify timer to match next frame's expiration time */ 455 mod_timer(&reorder_buf->reorder_timer, 456 entries[index].e.reorder_time + 1 + 457 RX_REORDER_BUF_TIMEOUT_MQ); 458 } else { 459 del_timer(&reorder_buf->reorder_timer); 460 } 461 } 462 463 void iwl_mvm_reorder_timer_expired(struct timer_list *t) 464 { 465 struct iwl_mvm_reorder_buffer *buf = from_timer(buf, t, reorder_timer); 466 struct iwl_mvm_baid_data *baid_data = 467 iwl_mvm_baid_data_from_reorder_buf(buf); 468 struct iwl_mvm_reorder_buf_entry *entries = 469 &baid_data->entries[buf->queue * baid_data->entries_per_queue]; 470 int i; 471 u16 sn = 0, index = 0; 472 bool expired = false; 473 bool cont = false; 474 475 spin_lock(&buf->lock); 476 477 if (!buf->num_stored || buf->removed) { 478 spin_unlock(&buf->lock); 479 return; 480 } 481 482 for (i = 0; i < buf->buf_size ; i++) { 483 index = (buf->head_sn + i) % buf->buf_size; 484 485 if (skb_queue_empty(&entries[index].e.frames)) { 486 /* 487 * If there is a hole and the next frame didn't expire 488 * we want to break and not advance SN 489 */ 490 cont = false; 491 continue; 492 } 493 if (!cont && 494 !time_after(jiffies, entries[index].e.reorder_time + 495 RX_REORDER_BUF_TIMEOUT_MQ)) 496 break; 497 498 expired = true; 499 /* continue until next hole after this expired frames */ 500 cont = true; 501 sn = ieee80211_sn_add(buf->head_sn, i + 1); 502 } 503 504 if (expired) { 505 struct ieee80211_sta *sta; 506 struct iwl_mvm_sta *mvmsta; 507 u8 sta_id = baid_data->sta_id; 508 509 rcu_read_lock(); 510 sta = rcu_dereference(buf->mvm->fw_id_to_mac_id[sta_id]); 511 mvmsta = iwl_mvm_sta_from_mac80211(sta); 512 513 /* SN is set to the last expired frame + 1 */ 514 IWL_DEBUG_HT(buf->mvm, 515 "Releasing expired frames for sta %u, sn %d\n", 516 sta_id, sn); 517 iwl_mvm_event_frame_timeout_callback(buf->mvm, mvmsta->vif, 518 sta, baid_data->tid); 519 iwl_mvm_release_frames(buf->mvm, sta, NULL, baid_data, buf, sn); 520 rcu_read_unlock(); 521 } else { 522 /* 523 * If no frame expired and there are stored frames, index is now 524 * pointing to the first unexpired frame - modify timer 525 * accordingly to this frame. 526 */ 527 mod_timer(&buf->reorder_timer, 528 entries[index].e.reorder_time + 529 1 + RX_REORDER_BUF_TIMEOUT_MQ); 530 } 531 spin_unlock(&buf->lock); 532 } 533 534 static void iwl_mvm_del_ba(struct iwl_mvm *mvm, int queue, 535 struct iwl_mvm_delba_data *data) 536 { 537 struct iwl_mvm_baid_data *ba_data; 538 struct ieee80211_sta *sta; 539 struct iwl_mvm_reorder_buffer *reorder_buf; 540 u8 baid = data->baid; 541 542 if (WARN_ONCE(baid >= IWL_MAX_BAID, "invalid BAID: %x\n", baid)) 543 return; 544 545 rcu_read_lock(); 546 547 ba_data = rcu_dereference(mvm->baid_map[baid]); 548 if (WARN_ON_ONCE(!ba_data)) 549 goto out; 550 551 sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]); 552 if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) 553 goto out; 554 555 reorder_buf = &ba_data->reorder_buf[queue]; 556 557 /* release all frames that are in the reorder buffer to the stack */ 558 spin_lock_bh(&reorder_buf->lock); 559 iwl_mvm_release_frames(mvm, sta, NULL, ba_data, reorder_buf, 560 ieee80211_sn_add(reorder_buf->head_sn, 561 reorder_buf->buf_size)); 562 spin_unlock_bh(&reorder_buf->lock); 563 del_timer_sync(&reorder_buf->reorder_timer); 564 565 out: 566 rcu_read_unlock(); 567 } 568 569 void iwl_mvm_rx_queue_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb, 570 int queue) 571 { 572 struct iwl_rx_packet *pkt = rxb_addr(rxb); 573 struct iwl_rxq_sync_notification *notif; 574 struct iwl_mvm_internal_rxq_notif *internal_notif; 575 576 notif = (void *)pkt->data; 577 internal_notif = (void *)notif->payload; 578 579 if (internal_notif->sync) { 580 if (mvm->queue_sync_cookie != internal_notif->cookie) { 581 WARN_ONCE(1, 582 "Received expired RX queue sync message\n"); 583 return; 584 } 585 if (!atomic_dec_return(&mvm->queue_sync_counter)) 586 wake_up(&mvm->rx_sync_waitq); 587 } 588 589 switch (internal_notif->type) { 590 case IWL_MVM_RXQ_EMPTY: 591 break; 592 case IWL_MVM_RXQ_NOTIF_DEL_BA: 593 iwl_mvm_del_ba(mvm, queue, (void *)internal_notif->data); 594 break; 595 default: 596 WARN_ONCE(1, "Invalid identifier %d", internal_notif->type); 597 } 598 } 599 600 /* 601 * Returns true if the MPDU was buffered\dropped, false if it should be passed 602 * to upper layer. 603 */ 604 static bool iwl_mvm_reorder(struct iwl_mvm *mvm, 605 struct napi_struct *napi, 606 int queue, 607 struct ieee80211_sta *sta, 608 struct sk_buff *skb, 609 struct iwl_rx_mpdu_desc *desc) 610 { 611 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 612 struct iwl_mvm_sta *mvm_sta; 613 struct iwl_mvm_baid_data *baid_data; 614 struct iwl_mvm_reorder_buffer *buffer; 615 struct sk_buff *tail; 616 u32 reorder = le32_to_cpu(desc->reorder_data); 617 bool amsdu = desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU; 618 bool last_subframe = 619 desc->amsdu_info & IWL_RX_MPDU_AMSDU_LAST_SUBFRAME; 620 u8 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; 621 u8 sub_frame_idx = desc->amsdu_info & 622 IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK; 623 struct iwl_mvm_reorder_buf_entry *entries; 624 int index; 625 u16 nssn, sn; 626 u8 baid; 627 628 baid = (reorder & IWL_RX_MPDU_REORDER_BAID_MASK) >> 629 IWL_RX_MPDU_REORDER_BAID_SHIFT; 630 631 /* 632 * This also covers the case of receiving a Block Ack Request 633 * outside a BA session; we'll pass it to mac80211 and that 634 * then sends a delBA action frame. 635 */ 636 if (baid == IWL_RX_REORDER_DATA_INVALID_BAID) 637 return false; 638 639 /* no sta yet */ 640 if (WARN_ONCE(IS_ERR_OR_NULL(sta), 641 "Got valid BAID without a valid station assigned\n")) 642 return false; 643 644 mvm_sta = iwl_mvm_sta_from_mac80211(sta); 645 646 /* not a data packet or a bar */ 647 if (!ieee80211_is_back_req(hdr->frame_control) && 648 (!ieee80211_is_data_qos(hdr->frame_control) || 649 is_multicast_ether_addr(hdr->addr1))) 650 return false; 651 652 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) 653 return false; 654 655 baid_data = rcu_dereference(mvm->baid_map[baid]); 656 if (!baid_data) { 657 IWL_DEBUG_RX(mvm, 658 "Got valid BAID but no baid allocated, bypass the re-ordering buffer. Baid %d reorder 0x%x\n", 659 baid, reorder); 660 return false; 661 } 662 663 if (WARN(tid != baid_data->tid || mvm_sta->sta_id != baid_data->sta_id, 664 "baid 0x%x is mapped to sta:%d tid:%d, but was received for sta:%d tid:%d\n", 665 baid, baid_data->sta_id, baid_data->tid, mvm_sta->sta_id, 666 tid)) 667 return false; 668 669 nssn = reorder & IWL_RX_MPDU_REORDER_NSSN_MASK; 670 sn = (reorder & IWL_RX_MPDU_REORDER_SN_MASK) >> 671 IWL_RX_MPDU_REORDER_SN_SHIFT; 672 673 buffer = &baid_data->reorder_buf[queue]; 674 entries = &baid_data->entries[queue * baid_data->entries_per_queue]; 675 676 spin_lock_bh(&buffer->lock); 677 678 if (!buffer->valid) { 679 if (reorder & IWL_RX_MPDU_REORDER_BA_OLD_SN) { 680 spin_unlock_bh(&buffer->lock); 681 return false; 682 } 683 buffer->valid = true; 684 } 685 686 if (ieee80211_is_back_req(hdr->frame_control)) { 687 iwl_mvm_release_frames(mvm, sta, napi, baid_data, buffer, nssn); 688 goto drop; 689 } 690 691 /* 692 * If there was a significant jump in the nssn - adjust. 693 * If the SN is smaller than the NSSN it might need to first go into 694 * the reorder buffer, in which case we just release up to it and the 695 * rest of the function will take care of storing it and releasing up to 696 * the nssn 697 */ 698 if (!iwl_mvm_is_sn_less(nssn, buffer->head_sn + buffer->buf_size, 699 buffer->buf_size) || 700 !ieee80211_sn_less(sn, buffer->head_sn + buffer->buf_size)) { 701 u16 min_sn = ieee80211_sn_less(sn, nssn) ? sn : nssn; 702 703 iwl_mvm_release_frames(mvm, sta, napi, baid_data, buffer, 704 min_sn); 705 } 706 707 /* drop any oudated packets */ 708 if (ieee80211_sn_less(sn, buffer->head_sn)) 709 goto drop; 710 711 /* release immediately if allowed by nssn and no stored frames */ 712 if (!buffer->num_stored && ieee80211_sn_less(sn, nssn)) { 713 if (iwl_mvm_is_sn_less(buffer->head_sn, nssn, 714 buffer->buf_size) && 715 (!amsdu || last_subframe)) 716 buffer->head_sn = nssn; 717 /* No need to update AMSDU last SN - we are moving the head */ 718 spin_unlock_bh(&buffer->lock); 719 return false; 720 } 721 722 /* 723 * release immediately if there are no stored frames, and the sn is 724 * equal to the head. 725 * This can happen due to reorder timer, where NSSN is behind head_sn. 726 * When we released everything, and we got the next frame in the 727 * sequence, according to the NSSN we can't release immediately, 728 * while technically there is no hole and we can move forward. 729 */ 730 if (!buffer->num_stored && sn == buffer->head_sn) { 731 if (!amsdu || last_subframe) 732 buffer->head_sn = ieee80211_sn_inc(buffer->head_sn); 733 /* No need to update AMSDU last SN - we are moving the head */ 734 spin_unlock_bh(&buffer->lock); 735 return false; 736 } 737 738 index = sn % buffer->buf_size; 739 740 /* 741 * Check if we already stored this frame 742 * As AMSDU is either received or not as whole, logic is simple: 743 * If we have frames in that position in the buffer and the last frame 744 * originated from AMSDU had a different SN then it is a retransmission. 745 * If it is the same SN then if the subframe index is incrementing it 746 * is the same AMSDU - otherwise it is a retransmission. 747 */ 748 tail = skb_peek_tail(&entries[index].e.frames); 749 if (tail && !amsdu) 750 goto drop; 751 else if (tail && (sn != buffer->last_amsdu || 752 buffer->last_sub_index >= sub_frame_idx)) 753 goto drop; 754 755 /* put in reorder buffer */ 756 __skb_queue_tail(&entries[index].e.frames, skb); 757 buffer->num_stored++; 758 entries[index].e.reorder_time = jiffies; 759 760 if (amsdu) { 761 buffer->last_amsdu = sn; 762 buffer->last_sub_index = sub_frame_idx; 763 } 764 765 /* 766 * We cannot trust NSSN for AMSDU sub-frames that are not the last. 767 * The reason is that NSSN advances on the first sub-frame, and may 768 * cause the reorder buffer to advance before all the sub-frames arrive. 769 * Example: reorder buffer contains SN 0 & 2, and we receive AMSDU with 770 * SN 1. NSSN for first sub frame will be 3 with the result of driver 771 * releasing SN 0,1, 2. When sub-frame 1 arrives - reorder buffer is 772 * already ahead and it will be dropped. 773 * If the last sub-frame is not on this queue - we will get frame 774 * release notification with up to date NSSN. 775 */ 776 if (!amsdu || last_subframe) 777 iwl_mvm_release_frames(mvm, sta, napi, baid_data, buffer, nssn); 778 779 spin_unlock_bh(&buffer->lock); 780 return true; 781 782 drop: 783 kfree_skb(skb); 784 spin_unlock_bh(&buffer->lock); 785 return true; 786 } 787 788 static void iwl_mvm_agg_rx_received(struct iwl_mvm *mvm, 789 u32 reorder_data, u8 baid) 790 { 791 unsigned long now = jiffies; 792 unsigned long timeout; 793 struct iwl_mvm_baid_data *data; 794 795 rcu_read_lock(); 796 797 data = rcu_dereference(mvm->baid_map[baid]); 798 if (!data) { 799 IWL_DEBUG_RX(mvm, 800 "Got valid BAID but no baid allocated, bypass the re-ordering buffer. Baid %d reorder 0x%x\n", 801 baid, reorder_data); 802 goto out; 803 } 804 805 if (!data->timeout) 806 goto out; 807 808 timeout = data->timeout; 809 /* 810 * Do not update last rx all the time to avoid cache bouncing 811 * between the rx queues. 812 * Update it every timeout. Worst case is the session will 813 * expire after ~ 2 * timeout, which doesn't matter that much. 814 */ 815 if (time_before(data->last_rx + TU_TO_JIFFIES(timeout), now)) 816 /* Update is atomic */ 817 data->last_rx = now; 818 819 out: 820 rcu_read_unlock(); 821 } 822 823 void iwl_mvm_rx_mpdu_mq(struct iwl_mvm *mvm, struct napi_struct *napi, 824 struct iwl_rx_cmd_buffer *rxb, int queue) 825 { 826 struct ieee80211_rx_status *rx_status; 827 struct iwl_rx_packet *pkt = rxb_addr(rxb); 828 struct iwl_rx_mpdu_desc *desc = (void *)pkt->data; 829 struct ieee80211_hdr *hdr = (void *)(pkt->data + sizeof(*desc)); 830 u32 len = le16_to_cpu(desc->mpdu_len); 831 u32 rate_n_flags = le32_to_cpu(desc->rate_n_flags); 832 u16 phy_info = le16_to_cpu(desc->phy_info); 833 struct ieee80211_sta *sta = NULL; 834 struct sk_buff *skb; 835 u8 crypt_len = 0; 836 837 if (unlikely(test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status))) 838 return; 839 840 /* Dont use dev_alloc_skb(), we'll have enough headroom once 841 * ieee80211_hdr pulled. 842 */ 843 skb = alloc_skb(128, GFP_ATOMIC); 844 if (!skb) { 845 IWL_ERR(mvm, "alloc_skb failed\n"); 846 return; 847 } 848 849 rx_status = IEEE80211_SKB_RXCB(skb); 850 851 if (iwl_mvm_rx_crypto(mvm, hdr, rx_status, desc, queue, &crypt_len)) { 852 kfree_skb(skb); 853 return; 854 } 855 856 /* 857 * Keep packets with CRC errors (and with overrun) for monitor mode 858 * (otherwise the firmware discards them) but mark them as bad. 859 */ 860 if (!(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_CRC_OK)) || 861 !(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_OVERRUN_OK))) { 862 IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n", 863 le16_to_cpu(desc->status)); 864 rx_status->flag |= RX_FLAG_FAILED_FCS_CRC; 865 } 866 /* set the preamble flag if appropriate */ 867 if (phy_info & IWL_RX_MPDU_PHY_SHORT_PREAMBLE) 868 rx_status->enc_flags |= RX_ENC_FLAG_SHORTPRE; 869 870 if (likely(!(phy_info & IWL_RX_MPDU_PHY_TSF_OVERLOAD))) { 871 rx_status->mactime = le64_to_cpu(desc->tsf_on_air_rise); 872 /* TSF as indicated by the firmware is at INA time */ 873 rx_status->flag |= RX_FLAG_MACTIME_PLCP_START; 874 } 875 rx_status->device_timestamp = le32_to_cpu(desc->gp2_on_air_rise); 876 rx_status->band = desc->channel > 14 ? NL80211_BAND_5GHZ : 877 NL80211_BAND_2GHZ; 878 rx_status->freq = ieee80211_channel_to_frequency(desc->channel, 879 rx_status->band); 880 iwl_mvm_get_signal_strength(mvm, desc, rx_status); 881 882 /* update aggregation data for monitor sake on default queue */ 883 if (!queue && (phy_info & IWL_RX_MPDU_PHY_AMPDU)) { 884 bool toggle_bit = phy_info & IWL_RX_MPDU_PHY_AMPDU_TOGGLE; 885 886 rx_status->flag |= RX_FLAG_AMPDU_DETAILS; 887 rx_status->ampdu_reference = mvm->ampdu_ref; 888 /* toggle is switched whenever new aggregation starts */ 889 if (toggle_bit != mvm->ampdu_toggle) { 890 mvm->ampdu_ref++; 891 mvm->ampdu_toggle = toggle_bit; 892 } 893 } 894 895 rcu_read_lock(); 896 897 if (desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_SRC_STA_FOUND)) { 898 u8 id = desc->sta_id_flags & IWL_RX_MPDU_SIF_STA_ID_MASK; 899 900 if (!WARN_ON_ONCE(id >= ARRAY_SIZE(mvm->fw_id_to_mac_id))) { 901 sta = rcu_dereference(mvm->fw_id_to_mac_id[id]); 902 if (IS_ERR(sta)) 903 sta = NULL; 904 } 905 } else if (!is_multicast_ether_addr(hdr->addr2)) { 906 /* 907 * This is fine since we prevent two stations with the same 908 * address from being added. 909 */ 910 sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL); 911 } 912 913 if (sta) { 914 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 915 struct ieee80211_vif *tx_blocked_vif = 916 rcu_dereference(mvm->csa_tx_blocked_vif); 917 u8 baid = (u8)((le32_to_cpu(desc->reorder_data) & 918 IWL_RX_MPDU_REORDER_BAID_MASK) >> 919 IWL_RX_MPDU_REORDER_BAID_SHIFT); 920 921 /* 922 * We have tx blocked stations (with CS bit). If we heard 923 * frames from a blocked station on a new channel we can 924 * TX to it again. 925 */ 926 if (unlikely(tx_blocked_vif) && 927 tx_blocked_vif == mvmsta->vif) { 928 struct iwl_mvm_vif *mvmvif = 929 iwl_mvm_vif_from_mac80211(tx_blocked_vif); 930 931 if (mvmvif->csa_target_freq == rx_status->freq) 932 iwl_mvm_sta_modify_disable_tx_ap(mvm, sta, 933 false); 934 } 935 936 rs_update_last_rssi(mvm, &mvmsta->lq_sta, rx_status); 937 938 if (iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_RSSI) && 939 ieee80211_is_beacon(hdr->frame_control)) { 940 struct iwl_fw_dbg_trigger_tlv *trig; 941 struct iwl_fw_dbg_trigger_low_rssi *rssi_trig; 942 bool trig_check; 943 s32 rssi; 944 945 trig = iwl_fw_dbg_get_trigger(mvm->fw, 946 FW_DBG_TRIGGER_RSSI); 947 rssi_trig = (void *)trig->data; 948 rssi = le32_to_cpu(rssi_trig->rssi); 949 950 trig_check = 951 iwl_fw_dbg_trigger_check_stop(&mvm->fwrt, 952 ieee80211_vif_to_wdev(mvmsta->vif), 953 trig); 954 if (trig_check && rx_status->signal < rssi) 955 iwl_fw_dbg_collect_trig(&mvm->fwrt, trig, 956 NULL); 957 } 958 959 if (ieee80211_is_data(hdr->frame_control)) 960 iwl_mvm_rx_csum(sta, skb, desc); 961 962 if (iwl_mvm_is_nonagg_dup(sta, queue, rx_status, hdr, desc)) { 963 kfree_skb(skb); 964 goto out; 965 } 966 967 /* 968 * Our hardware de-aggregates AMSDUs but copies the mac header 969 * as it to the de-aggregated MPDUs. We need to turn off the 970 * AMSDU bit in the QoS control ourselves. 971 * In addition, HW reverses addr3 and addr4 - reverse it back. 972 */ 973 if ((desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU) && 974 !WARN_ON(!ieee80211_is_data_qos(hdr->frame_control))) { 975 int i; 976 u8 *qc = ieee80211_get_qos_ctl(hdr); 977 u8 mac_addr[ETH_ALEN]; 978 979 *qc &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT; 980 981 for (i = 0; i < ETH_ALEN; i++) 982 mac_addr[i] = hdr->addr3[ETH_ALEN - i - 1]; 983 ether_addr_copy(hdr->addr3, mac_addr); 984 985 if (ieee80211_has_a4(hdr->frame_control)) { 986 for (i = 0; i < ETH_ALEN; i++) 987 mac_addr[i] = 988 hdr->addr4[ETH_ALEN - i - 1]; 989 ether_addr_copy(hdr->addr4, mac_addr); 990 } 991 } 992 if (baid != IWL_RX_REORDER_DATA_INVALID_BAID) { 993 u32 reorder_data = le32_to_cpu(desc->reorder_data); 994 995 iwl_mvm_agg_rx_received(mvm, reorder_data, baid); 996 } 997 } 998 999 /* Set up the HT phy flags */ 1000 switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) { 1001 case RATE_MCS_CHAN_WIDTH_20: 1002 break; 1003 case RATE_MCS_CHAN_WIDTH_40: 1004 rx_status->bw = RATE_INFO_BW_40; 1005 break; 1006 case RATE_MCS_CHAN_WIDTH_80: 1007 rx_status->bw = RATE_INFO_BW_80; 1008 break; 1009 case RATE_MCS_CHAN_WIDTH_160: 1010 rx_status->bw = RATE_INFO_BW_160; 1011 break; 1012 } 1013 if (rate_n_flags & RATE_MCS_SGI_MSK) 1014 rx_status->enc_flags |= RX_ENC_FLAG_SHORT_GI; 1015 if (rate_n_flags & RATE_HT_MCS_GF_MSK) 1016 rx_status->enc_flags |= RX_ENC_FLAG_HT_GF; 1017 if (rate_n_flags & RATE_MCS_LDPC_MSK) 1018 rx_status->enc_flags |= RX_ENC_FLAG_LDPC; 1019 if (rate_n_flags & RATE_MCS_HT_MSK) { 1020 u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >> 1021 RATE_MCS_STBC_POS; 1022 rx_status->encoding = RX_ENC_HT; 1023 rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK; 1024 rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT; 1025 } else if (rate_n_flags & RATE_MCS_VHT_MSK) { 1026 u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >> 1027 RATE_MCS_STBC_POS; 1028 rx_status->nss = 1029 ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >> 1030 RATE_VHT_MCS_NSS_POS) + 1; 1031 rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK; 1032 rx_status->encoding = RX_ENC_VHT; 1033 rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT; 1034 if (rate_n_flags & RATE_MCS_BF_MSK) 1035 rx_status->enc_flags |= RX_ENC_FLAG_BF; 1036 } else { 1037 int rate = iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags, 1038 rx_status->band); 1039 1040 if (WARN(rate < 0 || rate > 0xFF, 1041 "Invalid rate flags 0x%x, band %d,\n", 1042 rate_n_flags, rx_status->band)) { 1043 kfree_skb(skb); 1044 goto out; 1045 } 1046 rx_status->rate_idx = rate; 1047 1048 } 1049 1050 /* management stuff on default queue */ 1051 if (!queue) { 1052 if (unlikely((ieee80211_is_beacon(hdr->frame_control) || 1053 ieee80211_is_probe_resp(hdr->frame_control)) && 1054 mvm->sched_scan_pass_all == 1055 SCHED_SCAN_PASS_ALL_ENABLED)) 1056 mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_FOUND; 1057 1058 if (unlikely(ieee80211_is_beacon(hdr->frame_control) || 1059 ieee80211_is_probe_resp(hdr->frame_control))) 1060 rx_status->boottime_ns = ktime_get_boot_ns(); 1061 } 1062 1063 iwl_mvm_create_skb(skb, hdr, len, crypt_len, rxb); 1064 if (!iwl_mvm_reorder(mvm, napi, queue, sta, skb, desc)) 1065 iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb, queue, sta); 1066 out: 1067 rcu_read_unlock(); 1068 } 1069 1070 void iwl_mvm_rx_frame_release(struct iwl_mvm *mvm, struct napi_struct *napi, 1071 struct iwl_rx_cmd_buffer *rxb, int queue) 1072 { 1073 struct iwl_rx_packet *pkt = rxb_addr(rxb); 1074 struct iwl_frame_release *release = (void *)pkt->data; 1075 struct ieee80211_sta *sta; 1076 struct iwl_mvm_reorder_buffer *reorder_buf; 1077 struct iwl_mvm_baid_data *ba_data; 1078 1079 int baid = release->baid; 1080 1081 IWL_DEBUG_HT(mvm, "Frame release notification for BAID %u, NSSN %d\n", 1082 release->baid, le16_to_cpu(release->nssn)); 1083 1084 if (WARN_ON_ONCE(baid == IWL_RX_REORDER_DATA_INVALID_BAID)) 1085 return; 1086 1087 rcu_read_lock(); 1088 1089 ba_data = rcu_dereference(mvm->baid_map[baid]); 1090 if (WARN_ON_ONCE(!ba_data)) 1091 goto out; 1092 1093 sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]); 1094 if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) 1095 goto out; 1096 1097 reorder_buf = &ba_data->reorder_buf[queue]; 1098 1099 spin_lock_bh(&reorder_buf->lock); 1100 iwl_mvm_release_frames(mvm, sta, napi, ba_data, reorder_buf, 1101 le16_to_cpu(release->nssn)); 1102 spin_unlock_bh(&reorder_buf->lock); 1103 1104 out: 1105 rcu_read_unlock(); 1106 } 1107