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 - 2016 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 - 2016 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 len -= pad_len; 155 156 /* If frame is small enough to fit in skb->head, pull it completely. 157 * If not, only pull ieee80211_hdr (including crypto if present, and 158 * an additional 8 bytes for SNAP/ethertype, see below) so that 159 * splice() or TCP coalesce are more efficient. 160 * 161 * Since, in addition, ieee80211_data_to_8023() always pull in at 162 * least 8 bytes (possibly more for mesh) we can do the same here 163 * to save the cost of doing it later. That still doesn't pull in 164 * the actual IP header since the typical case has a SNAP header. 165 * If the latter changes (there are efforts in the standards group 166 * to do so) we should revisit this and ieee80211_data_to_8023(). 167 */ 168 headlen = (len <= skb_tailroom(skb)) ? len : 169 hdrlen + crypt_len + 8; 170 171 /* The firmware may align the packet to DWORD. 172 * The padding is inserted after the IV. 173 * After copying the header + IV skip the padding if 174 * present before copying packet data. 175 */ 176 hdrlen += crypt_len; 177 memcpy(skb_put(skb, hdrlen), hdr, hdrlen); 178 memcpy(skb_put(skb, headlen - hdrlen), (u8 *)hdr + hdrlen + pad_len, 179 headlen - hdrlen); 180 181 fraglen = len - headlen; 182 183 if (fraglen) { 184 int offset = (void *)hdr + headlen + pad_len - 185 rxb_addr(rxb) + rxb_offset(rxb); 186 187 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset, 188 fraglen, rxb->truesize); 189 } 190 } 191 192 /* iwl_mvm_pass_packet_to_mac80211 - passes the packet for mac80211 */ 193 static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm, 194 struct napi_struct *napi, 195 struct sk_buff *skb, int queue, 196 struct ieee80211_sta *sta) 197 { 198 if (iwl_mvm_check_pn(mvm, skb, queue, sta)) 199 kfree_skb(skb); 200 else 201 ieee80211_rx_napi(mvm->hw, sta, skb, napi); 202 } 203 204 static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm, 205 struct iwl_rx_mpdu_desc *desc, 206 struct ieee80211_rx_status *rx_status) 207 { 208 int energy_a, energy_b, max_energy; 209 210 energy_a = desc->energy_a; 211 energy_a = energy_a ? -energy_a : S8_MIN; 212 energy_b = desc->energy_b; 213 energy_b = energy_b ? -energy_b : S8_MIN; 214 max_energy = max(energy_a, energy_b); 215 216 IWL_DEBUG_STATS(mvm, "energy In A %d B %d, and max %d\n", 217 energy_a, energy_b, max_energy); 218 219 rx_status->signal = max_energy; 220 rx_status->chains = 0; /* TODO: phy info */ 221 rx_status->chain_signal[0] = energy_a; 222 rx_status->chain_signal[1] = energy_b; 223 rx_status->chain_signal[2] = S8_MIN; 224 } 225 226 static int iwl_mvm_rx_crypto(struct iwl_mvm *mvm, struct ieee80211_hdr *hdr, 227 struct ieee80211_rx_status *stats, 228 struct iwl_rx_mpdu_desc *desc, int queue, 229 u8 *crypt_len) 230 { 231 u16 status = le16_to_cpu(desc->status); 232 233 if (!ieee80211_has_protected(hdr->frame_control) || 234 (status & IWL_RX_MPDU_STATUS_SEC_MASK) == 235 IWL_RX_MPDU_STATUS_SEC_NONE) 236 return 0; 237 238 /* TODO: handle packets encrypted with unknown alg */ 239 240 switch (status & IWL_RX_MPDU_STATUS_SEC_MASK) { 241 case IWL_RX_MPDU_STATUS_SEC_CCM: 242 case IWL_RX_MPDU_STATUS_SEC_GCM: 243 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN != IEEE80211_GCMP_PN_LEN); 244 /* alg is CCM: check MIC only */ 245 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK)) 246 return -1; 247 248 stats->flag |= RX_FLAG_DECRYPTED; 249 *crypt_len = IEEE80211_CCMP_HDR_LEN; 250 return 0; 251 case IWL_RX_MPDU_STATUS_SEC_TKIP: 252 /* Don't drop the frame and decrypt it in SW */ 253 if (!(status & IWL_RX_MPDU_RES_STATUS_TTAK_OK)) 254 return 0; 255 256 *crypt_len = IEEE80211_TKIP_IV_LEN; 257 /* fall through if TTAK OK */ 258 case IWL_RX_MPDU_STATUS_SEC_WEP: 259 if (!(status & IWL_RX_MPDU_STATUS_ICV_OK)) 260 return -1; 261 262 stats->flag |= RX_FLAG_DECRYPTED; 263 if ((status & IWL_RX_MPDU_STATUS_SEC_MASK) == 264 IWL_RX_MPDU_STATUS_SEC_WEP) 265 *crypt_len = IEEE80211_WEP_IV_LEN; 266 return 0; 267 case IWL_RX_MPDU_STATUS_SEC_EXT_ENC: 268 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK)) 269 return -1; 270 stats->flag |= RX_FLAG_DECRYPTED; 271 return 0; 272 default: 273 IWL_ERR(mvm, "Unhandled alg: 0x%x\n", status); 274 } 275 276 return 0; 277 } 278 279 static void iwl_mvm_rx_csum(struct ieee80211_sta *sta, 280 struct sk_buff *skb, 281 struct iwl_rx_mpdu_desc *desc) 282 { 283 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 284 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif); 285 u16 flags = le16_to_cpu(desc->l3l4_flags); 286 u8 l3_prot = (u8)((flags & IWL_RX_L3L4_L3_PROTO_MASK) >> 287 IWL_RX_L3_PROTO_POS); 288 289 if (mvmvif->features & NETIF_F_RXCSUM && 290 flags & IWL_RX_L3L4_TCP_UDP_CSUM_OK && 291 (flags & IWL_RX_L3L4_IP_HDR_CSUM_OK || 292 l3_prot == IWL_RX_L3_TYPE_IPV6 || 293 l3_prot == IWL_RX_L3_TYPE_IPV6_FRAG)) 294 skb->ip_summed = CHECKSUM_UNNECESSARY; 295 } 296 297 /* 298 * returns true if a packet outside BA session is a duplicate and 299 * should be dropped 300 */ 301 static bool iwl_mvm_is_nonagg_dup(struct ieee80211_sta *sta, int queue, 302 struct ieee80211_rx_status *rx_status, 303 struct ieee80211_hdr *hdr, 304 struct iwl_rx_mpdu_desc *desc) 305 { 306 struct iwl_mvm_sta *mvm_sta; 307 struct iwl_mvm_rxq_dup_data *dup_data; 308 u8 baid, tid, sub_frame_idx; 309 310 if (WARN_ON(IS_ERR_OR_NULL(sta))) 311 return false; 312 313 baid = (le32_to_cpu(desc->reorder_data) & 314 IWL_RX_MPDU_REORDER_BAID_MASK) >> 315 IWL_RX_MPDU_REORDER_BAID_SHIFT; 316 317 if (baid != IWL_RX_REORDER_DATA_INVALID_BAID) 318 return false; 319 320 mvm_sta = iwl_mvm_sta_from_mac80211(sta); 321 dup_data = &mvm_sta->dup_data[queue]; 322 323 /* 324 * Drop duplicate 802.11 retransmissions 325 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery") 326 */ 327 if (ieee80211_is_ctl(hdr->frame_control) || 328 ieee80211_is_qos_nullfunc(hdr->frame_control) || 329 is_multicast_ether_addr(hdr->addr1)) { 330 rx_status->flag |= RX_FLAG_DUP_VALIDATED; 331 return false; 332 } 333 334 if (ieee80211_is_data_qos(hdr->frame_control)) 335 /* frame has qos control */ 336 tid = *ieee80211_get_qos_ctl(hdr) & 337 IEEE80211_QOS_CTL_TID_MASK; 338 else 339 tid = IWL_MAX_TID_COUNT; 340 341 /* If this wasn't a part of an A-MSDU the sub-frame index will be 0 */ 342 sub_frame_idx = desc->amsdu_info & IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK; 343 344 if (unlikely(ieee80211_has_retry(hdr->frame_control) && 345 dup_data->last_seq[tid] == hdr->seq_ctrl && 346 dup_data->last_sub_frame[tid] >= sub_frame_idx)) 347 return true; 348 349 dup_data->last_seq[tid] = hdr->seq_ctrl; 350 dup_data->last_sub_frame[tid] = sub_frame_idx; 351 352 rx_status->flag |= RX_FLAG_DUP_VALIDATED; 353 354 return false; 355 } 356 357 int iwl_mvm_notify_rx_queue(struct iwl_mvm *mvm, u32 rxq_mask, 358 const u8 *data, u32 count) 359 { 360 struct iwl_rxq_sync_cmd *cmd; 361 u32 data_size = sizeof(*cmd) + count; 362 int ret; 363 364 /* should be DWORD aligned */ 365 if (WARN_ON(count & 3 || count > IWL_MULTI_QUEUE_SYNC_MSG_MAX_SIZE)) 366 return -EINVAL; 367 368 cmd = kzalloc(data_size, GFP_KERNEL); 369 if (!cmd) 370 return -ENOMEM; 371 372 cmd->rxq_mask = cpu_to_le32(rxq_mask); 373 cmd->count = cpu_to_le32(count); 374 cmd->flags = 0; 375 memcpy(cmd->payload, data, count); 376 377 ret = iwl_mvm_send_cmd_pdu(mvm, 378 WIDE_ID(DATA_PATH_GROUP, 379 TRIGGER_RX_QUEUES_NOTIF_CMD), 380 0, data_size, cmd); 381 382 kfree(cmd); 383 return ret; 384 } 385 386 /* 387 * Returns true if sn2 - buffer_size < sn1 < sn2. 388 * To be used only in order to compare reorder buffer head with NSSN. 389 * We fully trust NSSN unless it is behind us due to reorder timeout. 390 * Reorder timeout can only bring us up to buffer_size SNs ahead of NSSN. 391 */ 392 static bool iwl_mvm_is_sn_less(u16 sn1, u16 sn2, u16 buffer_size) 393 { 394 return ieee80211_sn_less(sn1, sn2) && 395 !ieee80211_sn_less(sn1, sn2 - buffer_size); 396 } 397 398 #define RX_REORDER_BUF_TIMEOUT_MQ (HZ / 10) 399 400 static void iwl_mvm_release_frames(struct iwl_mvm *mvm, 401 struct ieee80211_sta *sta, 402 struct napi_struct *napi, 403 struct iwl_mvm_reorder_buffer *reorder_buf, 404 u16 nssn) 405 { 406 u16 ssn = reorder_buf->head_sn; 407 408 lockdep_assert_held(&reorder_buf->lock); 409 410 /* ignore nssn smaller than head sn - this can happen due to timeout */ 411 if (iwl_mvm_is_sn_less(nssn, ssn, reorder_buf->buf_size)) 412 return; 413 414 while (iwl_mvm_is_sn_less(ssn, nssn, reorder_buf->buf_size)) { 415 int index = ssn % reorder_buf->buf_size; 416 struct sk_buff_head *skb_list = &reorder_buf->entries[index]; 417 struct sk_buff *skb; 418 419 ssn = ieee80211_sn_inc(ssn); 420 421 /* 422 * Empty the list. Will have more than one frame for A-MSDU. 423 * Empty list is valid as well since nssn indicates frames were 424 * received. 425 */ 426 while ((skb = __skb_dequeue(skb_list))) { 427 iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb, 428 reorder_buf->queue, 429 sta); 430 reorder_buf->num_stored--; 431 } 432 } 433 reorder_buf->head_sn = nssn; 434 435 if (reorder_buf->num_stored && !reorder_buf->removed) { 436 u16 index = reorder_buf->head_sn % reorder_buf->buf_size; 437 438 while (skb_queue_empty(&reorder_buf->entries[index])) 439 index = (index + 1) % reorder_buf->buf_size; 440 /* modify timer to match next frame's expiration time */ 441 mod_timer(&reorder_buf->reorder_timer, 442 reorder_buf->reorder_time[index] + 1 + 443 RX_REORDER_BUF_TIMEOUT_MQ); 444 } else { 445 del_timer(&reorder_buf->reorder_timer); 446 } 447 } 448 449 void iwl_mvm_reorder_timer_expired(unsigned long data) 450 { 451 struct iwl_mvm_reorder_buffer *buf = (void *)data; 452 int i; 453 u16 sn = 0, index = 0; 454 bool expired = false; 455 456 spin_lock(&buf->lock); 457 458 if (!buf->num_stored || buf->removed) { 459 spin_unlock(&buf->lock); 460 return; 461 } 462 463 for (i = 0; i < buf->buf_size ; i++) { 464 index = (buf->head_sn + i) % buf->buf_size; 465 466 if (skb_queue_empty(&buf->entries[index])) 467 continue; 468 if (!time_after(jiffies, buf->reorder_time[index] + 469 RX_REORDER_BUF_TIMEOUT_MQ)) 470 break; 471 expired = true; 472 sn = ieee80211_sn_add(buf->head_sn, i + 1); 473 } 474 475 if (expired) { 476 struct ieee80211_sta *sta; 477 478 rcu_read_lock(); 479 sta = rcu_dereference(buf->mvm->fw_id_to_mac_id[buf->sta_id]); 480 /* SN is set to the last expired frame + 1 */ 481 IWL_DEBUG_HT(buf->mvm, 482 "Releasing expired frames for sta %u, sn %d\n", 483 buf->sta_id, sn); 484 iwl_mvm_release_frames(buf->mvm, sta, NULL, buf, sn); 485 rcu_read_unlock(); 486 } else if (buf->num_stored) { 487 /* 488 * If no frame expired and there are stored frames, index is now 489 * pointing to the first unexpired frame - modify timer 490 * accordingly to this frame. 491 */ 492 mod_timer(&buf->reorder_timer, 493 buf->reorder_time[index] + 494 1 + RX_REORDER_BUF_TIMEOUT_MQ); 495 } 496 spin_unlock(&buf->lock); 497 } 498 499 static void iwl_mvm_del_ba(struct iwl_mvm *mvm, int queue, 500 struct iwl_mvm_delba_data *data) 501 { 502 struct iwl_mvm_baid_data *ba_data; 503 struct ieee80211_sta *sta; 504 struct iwl_mvm_reorder_buffer *reorder_buf; 505 u8 baid = data->baid; 506 507 if (WARN_ONCE(baid >= IWL_MAX_BAID, "invalid BAID: %x\n", baid)) 508 return; 509 510 rcu_read_lock(); 511 512 ba_data = rcu_dereference(mvm->baid_map[baid]); 513 if (WARN_ON_ONCE(!ba_data)) 514 goto out; 515 516 sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]); 517 if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) 518 goto out; 519 520 reorder_buf = &ba_data->reorder_buf[queue]; 521 522 /* release all frames that are in the reorder buffer to the stack */ 523 spin_lock_bh(&reorder_buf->lock); 524 iwl_mvm_release_frames(mvm, sta, NULL, reorder_buf, 525 ieee80211_sn_add(reorder_buf->head_sn, 526 reorder_buf->buf_size)); 527 spin_unlock_bh(&reorder_buf->lock); 528 del_timer_sync(&reorder_buf->reorder_timer); 529 530 out: 531 rcu_read_unlock(); 532 } 533 534 void iwl_mvm_rx_queue_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb, 535 int queue) 536 { 537 struct iwl_rx_packet *pkt = rxb_addr(rxb); 538 struct iwl_rxq_sync_notification *notif; 539 struct iwl_mvm_internal_rxq_notif *internal_notif; 540 541 notif = (void *)pkt->data; 542 internal_notif = (void *)notif->payload; 543 544 if (internal_notif->sync) { 545 if (mvm->queue_sync_cookie != internal_notif->cookie) { 546 WARN_ONCE(1, 547 "Received expired RX queue sync message\n"); 548 return; 549 } 550 atomic_dec(&mvm->queue_sync_counter); 551 } 552 553 switch (internal_notif->type) { 554 case IWL_MVM_RXQ_EMPTY: 555 break; 556 case IWL_MVM_RXQ_NOTIF_DEL_BA: 557 iwl_mvm_del_ba(mvm, queue, (void *)internal_notif->data); 558 break; 559 default: 560 WARN_ONCE(1, "Invalid identifier %d", internal_notif->type); 561 } 562 } 563 564 /* 565 * Returns true if the MPDU was buffered\dropped, false if it should be passed 566 * to upper layer. 567 */ 568 static bool iwl_mvm_reorder(struct iwl_mvm *mvm, 569 struct napi_struct *napi, 570 int queue, 571 struct ieee80211_sta *sta, 572 struct sk_buff *skb, 573 struct iwl_rx_mpdu_desc *desc) 574 { 575 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 576 struct iwl_mvm_sta *mvm_sta; 577 struct iwl_mvm_baid_data *baid_data; 578 struct iwl_mvm_reorder_buffer *buffer; 579 struct sk_buff *tail; 580 u32 reorder = le32_to_cpu(desc->reorder_data); 581 bool amsdu = desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU; 582 bool last_subframe = 583 desc->amsdu_info & IWL_RX_MPDU_AMSDU_LAST_SUBFRAME; 584 u8 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; 585 u8 sub_frame_idx = desc->amsdu_info & 586 IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK; 587 int index; 588 u16 nssn, sn; 589 u8 baid; 590 591 baid = (reorder & IWL_RX_MPDU_REORDER_BAID_MASK) >> 592 IWL_RX_MPDU_REORDER_BAID_SHIFT; 593 594 /* 595 * This also covers the case of receiving a Block Ack Request 596 * outside a BA session; we'll pass it to mac80211 and that 597 * then sends a delBA action frame. 598 */ 599 if (baid == IWL_RX_REORDER_DATA_INVALID_BAID) 600 return false; 601 602 /* no sta yet */ 603 if (WARN_ON(IS_ERR_OR_NULL(sta))) 604 return false; 605 606 mvm_sta = iwl_mvm_sta_from_mac80211(sta); 607 608 /* not a data packet or a bar */ 609 if (!ieee80211_is_back_req(hdr->frame_control) && 610 (!ieee80211_is_data_qos(hdr->frame_control) || 611 is_multicast_ether_addr(hdr->addr1))) 612 return false; 613 614 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) 615 return false; 616 617 baid_data = rcu_dereference(mvm->baid_map[baid]); 618 if (WARN(!baid_data, 619 "Received baid %d, but no data exists for this BAID\n", baid)) 620 return false; 621 if (WARN(tid != baid_data->tid || mvm_sta->sta_id != baid_data->sta_id, 622 "baid 0x%x is mapped to sta:%d tid:%d, but was received for sta:%d tid:%d\n", 623 baid, baid_data->sta_id, baid_data->tid, mvm_sta->sta_id, 624 tid)) 625 return false; 626 627 nssn = reorder & IWL_RX_MPDU_REORDER_NSSN_MASK; 628 sn = (reorder & IWL_RX_MPDU_REORDER_SN_MASK) >> 629 IWL_RX_MPDU_REORDER_SN_SHIFT; 630 631 buffer = &baid_data->reorder_buf[queue]; 632 633 spin_lock_bh(&buffer->lock); 634 635 if (ieee80211_is_back_req(hdr->frame_control)) { 636 iwl_mvm_release_frames(mvm, sta, napi, buffer, nssn); 637 goto drop; 638 } 639 640 /* 641 * If there was a significant jump in the nssn - adjust. 642 * If the SN is smaller than the NSSN it might need to first go into 643 * the reorder buffer, in which case we just release up to it and the 644 * rest of the function will take of storing it and releasing up to the 645 * nssn 646 */ 647 if (!iwl_mvm_is_sn_less(nssn, buffer->head_sn + buffer->buf_size, 648 buffer->buf_size)) { 649 u16 min_sn = ieee80211_sn_less(sn, nssn) ? sn : nssn; 650 651 iwl_mvm_release_frames(mvm, sta, napi, buffer, min_sn); 652 } 653 654 /* drop any oudated packets */ 655 if (ieee80211_sn_less(sn, buffer->head_sn)) 656 goto drop; 657 658 /* release immediately if allowed by nssn and no stored frames */ 659 if (!buffer->num_stored && ieee80211_sn_less(sn, nssn)) { 660 if (iwl_mvm_is_sn_less(buffer->head_sn, nssn, 661 buffer->buf_size) && 662 (!amsdu || last_subframe)) 663 buffer->head_sn = nssn; 664 /* No need to update AMSDU last SN - we are moving the head */ 665 spin_unlock_bh(&buffer->lock); 666 return false; 667 } 668 669 index = sn % buffer->buf_size; 670 671 /* 672 * Check if we already stored this frame 673 * As AMSDU is either received or not as whole, logic is simple: 674 * If we have frames in that position in the buffer and the last frame 675 * originated from AMSDU had a different SN then it is a retransmission. 676 * If it is the same SN then if the subframe index is incrementing it 677 * is the same AMSDU - otherwise it is a retransmission. 678 */ 679 tail = skb_peek_tail(&buffer->entries[index]); 680 if (tail && !amsdu) 681 goto drop; 682 else if (tail && (sn != buffer->last_amsdu || 683 buffer->last_sub_index >= sub_frame_idx)) 684 goto drop; 685 686 /* put in reorder buffer */ 687 __skb_queue_tail(&buffer->entries[index], skb); 688 buffer->num_stored++; 689 buffer->reorder_time[index] = jiffies; 690 691 if (amsdu) { 692 buffer->last_amsdu = sn; 693 buffer->last_sub_index = sub_frame_idx; 694 } 695 696 /* 697 * We cannot trust NSSN for AMSDU sub-frames that are not the last. 698 * The reason is that NSSN advances on the first sub-frame, and may 699 * cause the reorder buffer to advance before all the sub-frames arrive. 700 * Example: reorder buffer contains SN 0 & 2, and we receive AMSDU with 701 * SN 1. NSSN for first sub frame will be 3 with the result of driver 702 * releasing SN 0,1, 2. When sub-frame 1 arrives - reorder buffer is 703 * already ahead and it will be dropped. 704 * If the last sub-frame is not on this queue - we will get frame 705 * release notification with up to date NSSN. 706 */ 707 if (!amsdu || last_subframe) 708 iwl_mvm_release_frames(mvm, sta, napi, buffer, nssn); 709 710 spin_unlock_bh(&buffer->lock); 711 return true; 712 713 drop: 714 kfree_skb(skb); 715 spin_unlock_bh(&buffer->lock); 716 return true; 717 } 718 719 static void iwl_mvm_agg_rx_received(struct iwl_mvm *mvm, u8 baid) 720 { 721 unsigned long now = jiffies; 722 unsigned long timeout; 723 struct iwl_mvm_baid_data *data; 724 725 rcu_read_lock(); 726 727 data = rcu_dereference(mvm->baid_map[baid]); 728 if (WARN_ON(!data)) 729 goto out; 730 731 if (!data->timeout) 732 goto out; 733 734 timeout = data->timeout; 735 /* 736 * Do not update last rx all the time to avoid cache bouncing 737 * between the rx queues. 738 * Update it every timeout. Worst case is the session will 739 * expire after ~ 2 * timeout, which doesn't matter that much. 740 */ 741 if (time_before(data->last_rx + TU_TO_JIFFIES(timeout), now)) 742 /* Update is atomic */ 743 data->last_rx = now; 744 745 out: 746 rcu_read_unlock(); 747 } 748 749 void iwl_mvm_rx_mpdu_mq(struct iwl_mvm *mvm, struct napi_struct *napi, 750 struct iwl_rx_cmd_buffer *rxb, int queue) 751 { 752 struct ieee80211_rx_status *rx_status; 753 struct iwl_rx_packet *pkt = rxb_addr(rxb); 754 struct iwl_rx_mpdu_desc *desc = (void *)pkt->data; 755 struct ieee80211_hdr *hdr = (void *)(pkt->data + sizeof(*desc)); 756 u32 len = le16_to_cpu(desc->mpdu_len); 757 u32 rate_n_flags = le32_to_cpu(desc->rate_n_flags); 758 u16 phy_info = le16_to_cpu(desc->phy_info); 759 struct ieee80211_sta *sta = NULL; 760 struct sk_buff *skb; 761 u8 crypt_len = 0; 762 763 /* Dont use dev_alloc_skb(), we'll have enough headroom once 764 * ieee80211_hdr pulled. 765 */ 766 skb = alloc_skb(128, GFP_ATOMIC); 767 if (!skb) { 768 IWL_ERR(mvm, "alloc_skb failed\n"); 769 return; 770 } 771 772 rx_status = IEEE80211_SKB_RXCB(skb); 773 774 if (iwl_mvm_rx_crypto(mvm, hdr, rx_status, desc, queue, &crypt_len)) { 775 kfree_skb(skb); 776 return; 777 } 778 779 /* 780 * Keep packets with CRC errors (and with overrun) for monitor mode 781 * (otherwise the firmware discards them) but mark them as bad. 782 */ 783 if (!(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_CRC_OK)) || 784 !(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_OVERRUN_OK))) { 785 IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n", 786 le16_to_cpu(desc->status)); 787 rx_status->flag |= RX_FLAG_FAILED_FCS_CRC; 788 } 789 /* set the preamble flag if appropriate */ 790 if (phy_info & IWL_RX_MPDU_PHY_SHORT_PREAMBLE) 791 rx_status->flag |= RX_FLAG_SHORTPRE; 792 793 if (likely(!(phy_info & IWL_RX_MPDU_PHY_TSF_OVERLOAD))) { 794 rx_status->mactime = le64_to_cpu(desc->tsf_on_air_rise); 795 /* TSF as indicated by the firmware is at INA time */ 796 rx_status->flag |= RX_FLAG_MACTIME_PLCP_START; 797 } 798 rx_status->device_timestamp = le32_to_cpu(desc->gp2_on_air_rise); 799 rx_status->band = desc->channel > 14 ? NL80211_BAND_5GHZ : 800 NL80211_BAND_2GHZ; 801 rx_status->freq = ieee80211_channel_to_frequency(desc->channel, 802 rx_status->band); 803 iwl_mvm_get_signal_strength(mvm, desc, rx_status); 804 805 /* update aggregation data for monitor sake on default queue */ 806 if (!queue && (phy_info & IWL_RX_MPDU_PHY_AMPDU)) { 807 bool toggle_bit = phy_info & IWL_RX_MPDU_PHY_AMPDU_TOGGLE; 808 809 rx_status->flag |= RX_FLAG_AMPDU_DETAILS; 810 rx_status->ampdu_reference = mvm->ampdu_ref; 811 /* toggle is switched whenever new aggregation starts */ 812 if (toggle_bit != mvm->ampdu_toggle) { 813 mvm->ampdu_ref++; 814 mvm->ampdu_toggle = toggle_bit; 815 } 816 } 817 818 rcu_read_lock(); 819 820 if (le16_to_cpu(desc->status) & IWL_RX_MPDU_STATUS_SRC_STA_FOUND) { 821 u8 id = desc->sta_id_flags & IWL_RX_MPDU_SIF_STA_ID_MASK; 822 823 if (!WARN_ON_ONCE(id >= IWL_MVM_STATION_COUNT)) { 824 sta = rcu_dereference(mvm->fw_id_to_mac_id[id]); 825 if (IS_ERR(sta)) 826 sta = NULL; 827 } 828 } else if (!is_multicast_ether_addr(hdr->addr2)) { 829 /* 830 * This is fine since we prevent two stations with the same 831 * address from being added. 832 */ 833 sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL); 834 } 835 836 if (sta) { 837 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 838 struct ieee80211_vif *tx_blocked_vif = 839 rcu_dereference(mvm->csa_tx_blocked_vif); 840 u8 baid = (u8)((le32_to_cpu(desc->reorder_data) & 841 IWL_RX_MPDU_REORDER_BAID_MASK) >> 842 IWL_RX_MPDU_REORDER_BAID_SHIFT); 843 844 /* 845 * We have tx blocked stations (with CS bit). If we heard 846 * frames from a blocked station on a new channel we can 847 * TX to it again. 848 */ 849 if (unlikely(tx_blocked_vif) && 850 tx_blocked_vif == mvmsta->vif) { 851 struct iwl_mvm_vif *mvmvif = 852 iwl_mvm_vif_from_mac80211(tx_blocked_vif); 853 854 if (mvmvif->csa_target_freq == rx_status->freq) 855 iwl_mvm_sta_modify_disable_tx_ap(mvm, sta, 856 false); 857 } 858 859 rs_update_last_rssi(mvm, &mvmsta->lq_sta, rx_status); 860 861 if (iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_RSSI) && 862 ieee80211_is_beacon(hdr->frame_control)) { 863 struct iwl_fw_dbg_trigger_tlv *trig; 864 struct iwl_fw_dbg_trigger_low_rssi *rssi_trig; 865 bool trig_check; 866 s32 rssi; 867 868 trig = iwl_fw_dbg_get_trigger(mvm->fw, 869 FW_DBG_TRIGGER_RSSI); 870 rssi_trig = (void *)trig->data; 871 rssi = le32_to_cpu(rssi_trig->rssi); 872 873 trig_check = 874 iwl_fw_dbg_trigger_check_stop(mvm, mvmsta->vif, 875 trig); 876 if (trig_check && rx_status->signal < rssi) 877 iwl_mvm_fw_dbg_collect_trig(mvm, trig, NULL); 878 } 879 880 if (ieee80211_is_data(hdr->frame_control)) 881 iwl_mvm_rx_csum(sta, skb, desc); 882 883 if (iwl_mvm_is_nonagg_dup(sta, queue, rx_status, hdr, desc)) { 884 kfree_skb(skb); 885 rcu_read_unlock(); 886 return; 887 } 888 889 /* 890 * Our hardware de-aggregates AMSDUs but copies the mac header 891 * as it to the de-aggregated MPDUs. We need to turn off the 892 * AMSDU bit in the QoS control ourselves. 893 */ 894 if ((desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU) && 895 !WARN_ON(!ieee80211_is_data_qos(hdr->frame_control))) { 896 u8 *qc = ieee80211_get_qos_ctl(hdr); 897 898 *qc &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT; 899 if (!(desc->amsdu_info & 900 IWL_RX_MPDU_AMSDU_LAST_SUBFRAME)) 901 rx_status->flag |= RX_FLAG_AMSDU_MORE; 902 } 903 if (baid != IWL_RX_REORDER_DATA_INVALID_BAID) 904 iwl_mvm_agg_rx_received(mvm, baid); 905 } 906 907 /* Set up the HT phy flags */ 908 switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) { 909 case RATE_MCS_CHAN_WIDTH_20: 910 break; 911 case RATE_MCS_CHAN_WIDTH_40: 912 rx_status->flag |= RX_FLAG_40MHZ; 913 break; 914 case RATE_MCS_CHAN_WIDTH_80: 915 rx_status->vht_flag |= RX_VHT_FLAG_80MHZ; 916 break; 917 case RATE_MCS_CHAN_WIDTH_160: 918 rx_status->vht_flag |= RX_VHT_FLAG_160MHZ; 919 break; 920 } 921 if (rate_n_flags & RATE_MCS_SGI_MSK) 922 rx_status->flag |= RX_FLAG_SHORT_GI; 923 if (rate_n_flags & RATE_HT_MCS_GF_MSK) 924 rx_status->flag |= RX_FLAG_HT_GF; 925 if (rate_n_flags & RATE_MCS_LDPC_MSK) 926 rx_status->flag |= RX_FLAG_LDPC; 927 if (rate_n_flags & RATE_MCS_HT_MSK) { 928 u8 stbc = (rate_n_flags & RATE_MCS_HT_STBC_MSK) >> 929 RATE_MCS_STBC_POS; 930 rx_status->flag |= RX_FLAG_HT; 931 rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK; 932 rx_status->flag |= stbc << RX_FLAG_STBC_SHIFT; 933 } else if (rate_n_flags & RATE_MCS_VHT_MSK) { 934 u8 stbc = (rate_n_flags & RATE_MCS_VHT_STBC_MSK) >> 935 RATE_MCS_STBC_POS; 936 rx_status->vht_nss = 937 ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >> 938 RATE_VHT_MCS_NSS_POS) + 1; 939 rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK; 940 rx_status->flag |= RX_FLAG_VHT; 941 rx_status->flag |= stbc << RX_FLAG_STBC_SHIFT; 942 if (rate_n_flags & RATE_MCS_BF_MSK) 943 rx_status->vht_flag |= RX_VHT_FLAG_BF; 944 } else { 945 rx_status->rate_idx = 946 iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags, 947 rx_status->band); 948 } 949 950 /* management stuff on default queue */ 951 if (!queue) { 952 if (unlikely((ieee80211_is_beacon(hdr->frame_control) || 953 ieee80211_is_probe_resp(hdr->frame_control)) && 954 mvm->sched_scan_pass_all == 955 SCHED_SCAN_PASS_ALL_ENABLED)) 956 mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_FOUND; 957 958 if (unlikely(ieee80211_is_beacon(hdr->frame_control) || 959 ieee80211_is_probe_resp(hdr->frame_control))) 960 rx_status->boottime_ns = ktime_get_boot_ns(); 961 } 962 963 iwl_mvm_create_skb(skb, hdr, len, crypt_len, rxb); 964 if (!iwl_mvm_reorder(mvm, napi, queue, sta, skb, desc)) 965 iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb, queue, sta); 966 rcu_read_unlock(); 967 } 968 969 void iwl_mvm_rx_frame_release(struct iwl_mvm *mvm, struct napi_struct *napi, 970 struct iwl_rx_cmd_buffer *rxb, int queue) 971 { 972 struct iwl_rx_packet *pkt = rxb_addr(rxb); 973 struct iwl_frame_release *release = (void *)pkt->data; 974 struct ieee80211_sta *sta; 975 struct iwl_mvm_reorder_buffer *reorder_buf; 976 struct iwl_mvm_baid_data *ba_data; 977 978 int baid = release->baid; 979 980 IWL_DEBUG_HT(mvm, "Frame release notification for BAID %u, NSSN %d\n", 981 release->baid, le16_to_cpu(release->nssn)); 982 983 if (WARN_ON_ONCE(baid == IWL_RX_REORDER_DATA_INVALID_BAID)) 984 return; 985 986 rcu_read_lock(); 987 988 ba_data = rcu_dereference(mvm->baid_map[baid]); 989 if (WARN_ON_ONCE(!ba_data)) 990 goto out; 991 992 sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]); 993 if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) 994 goto out; 995 996 reorder_buf = &ba_data->reorder_buf[queue]; 997 998 spin_lock_bh(&reorder_buf->lock); 999 iwl_mvm_release_frames(mvm, sta, napi, reorder_buf, 1000 le16_to_cpu(release->nssn)); 1001 spin_unlock_bh(&reorder_buf->lock); 1002 1003 out: 1004 rcu_read_unlock(); 1005 } 1006