1 /******************************************************************************
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.
8 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
9 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
10 * Copyright(c) 2015 Intel Deutschland GmbH
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.
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.
21 * The full GNU General Public License is included in this distribution
22 * in the file called COPYING.
24 * Contact Information:
25 * Intel Linux Wireless <ilw@linux.intel.com>
26 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
30 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
31 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
32 * Copyright(c) 2015 Intel Deutschland GmbH
33 * All rights reserved.
35 * Redistribution and use in source and binary forms, with or without
36 * modification, are permitted provided that the following conditions
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
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.
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"
68 void iwl_mvm_rx_phy_cmd_mq(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
72 #ifdef CONFIG_IWLWIFI_DEBUGFS
73 if (mvm->last_phy_info.phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
74 spin_lock(&mvm->drv_stats_lock);
75 mvm->drv_rx_stats.ampdu_count++;
76 spin_unlock(&mvm->drv_stats_lock);
81 static inline int iwl_mvm_check_pn(struct iwl_mvm *mvm, struct sk_buff *skb,
82 int queue, struct ieee80211_sta *sta)
84 struct iwl_mvm_sta *mvmsta;
85 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
86 struct ieee80211_rx_status *stats = IEEE80211_SKB_RXCB(skb);
87 struct iwl_mvm_key_pn *ptk_pn;
89 u8 pn[IEEE80211_CCMP_PN_LEN];
94 /* multicast and non-data only arrives on default queue */
95 if (!ieee80211_is_data(hdr->frame_control) ||
96 is_multicast_ether_addr(hdr->addr1))
99 /* do not check PN for open AP */
100 if (!(stats->flag & RX_FLAG_DECRYPTED))
104 * avoid checking for default queue - we don't want to replicate
105 * all the logic that's necessary for checking the PN on fragmented
106 * frames, leave that to mac80211
111 /* if we are here - this for sure is either CCMP or GCMP */
112 if (IS_ERR_OR_NULL(sta)) {
114 "expected hw-decrypted unicast frame for station\n");
118 mvmsta = iwl_mvm_sta_from_mac80211(sta);
120 extiv = (u8 *)hdr + ieee80211_hdrlen(hdr->frame_control);
121 keyidx = extiv[3] >> 6;
123 ptk_pn = rcu_dereference(mvmsta->ptk_pn[keyidx]);
127 if (ieee80211_is_data_qos(hdr->frame_control))
128 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
132 /* we don't use HCCA/802.11 QoS TSPECs, so drop such frames */
133 if (tid >= IWL_MAX_TID_COUNT)
144 if (memcmp(pn, ptk_pn->q[queue].pn[tid],
145 IEEE80211_CCMP_PN_LEN) <= 0)
148 memcpy(ptk_pn->q[queue].pn[tid], pn, IEEE80211_CCMP_PN_LEN);
149 stats->flag |= RX_FLAG_PN_VALIDATED;
154 /* iwl_mvm_create_skb Adds the rxb to a new skb */
155 static void iwl_mvm_create_skb(struct sk_buff *skb, struct ieee80211_hdr *hdr,
156 u16 len, u8 crypt_len,
157 struct iwl_rx_cmd_buffer *rxb)
159 unsigned int hdrlen, fraglen;
161 /* If frame is small enough to fit in skb->head, pull it completely.
162 * If not, only pull ieee80211_hdr (including crypto if present, and
163 * an additional 8 bytes for SNAP/ethertype, see below) so that
164 * splice() or TCP coalesce are more efficient.
166 * Since, in addition, ieee80211_data_to_8023() always pull in at
167 * least 8 bytes (possibly more for mesh) we can do the same here
168 * to save the cost of doing it later. That still doesn't pull in
169 * the actual IP header since the typical case has a SNAP header.
170 * If the latter changes (there are efforts in the standards group
171 * to do so) we should revisit this and ieee80211_data_to_8023().
173 hdrlen = (len <= skb_tailroom(skb)) ? len :
174 sizeof(*hdr) + crypt_len + 8;
176 memcpy(skb_put(skb, hdrlen), hdr, hdrlen);
177 fraglen = len - hdrlen;
180 int offset = (void *)hdr + hdrlen -
181 rxb_addr(rxb) + rxb_offset(rxb);
183 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
184 fraglen, rxb->truesize);
188 /* iwl_mvm_pass_packet_to_mac80211 - passes the packet for mac80211 */
189 static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm,
190 struct napi_struct *napi,
191 struct sk_buff *skb, int queue,
192 struct ieee80211_sta *sta)
194 if (iwl_mvm_check_pn(mvm, skb, queue, sta))
197 ieee80211_rx_napi(mvm->hw, skb, napi);
200 static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm,
201 struct iwl_rx_mpdu_desc *desc,
202 struct ieee80211_rx_status *rx_status)
204 int energy_a, energy_b, max_energy;
206 energy_a = desc->energy_a;
207 energy_a = energy_a ? -energy_a : S8_MIN;
208 energy_b = desc->energy_b;
209 energy_b = energy_b ? -energy_b : S8_MIN;
210 max_energy = max(energy_a, energy_b);
212 IWL_DEBUG_STATS(mvm, "energy In A %d B %d, and max %d\n",
213 energy_a, energy_b, max_energy);
215 rx_status->signal = max_energy;
216 rx_status->chains = 0; /* TODO: phy info */
217 rx_status->chain_signal[0] = energy_a;
218 rx_status->chain_signal[1] = energy_b;
219 rx_status->chain_signal[2] = S8_MIN;
222 static int iwl_mvm_rx_crypto(struct iwl_mvm *mvm, struct ieee80211_hdr *hdr,
223 struct ieee80211_rx_status *stats,
224 struct iwl_rx_mpdu_desc *desc, int queue,
227 u16 status = le16_to_cpu(desc->status);
229 if (!ieee80211_has_protected(hdr->frame_control) ||
230 (status & IWL_RX_MPDU_STATUS_SEC_MASK) ==
231 IWL_RX_MPDU_STATUS_SEC_NONE)
234 /* TODO: handle packets encrypted with unknown alg */
236 switch (status & IWL_RX_MPDU_STATUS_SEC_MASK) {
237 case IWL_RX_MPDU_STATUS_SEC_CCM:
238 case IWL_RX_MPDU_STATUS_SEC_GCM:
239 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN != IEEE80211_GCMP_PN_LEN);
240 /* alg is CCM: check MIC only */
241 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK))
244 stats->flag |= RX_FLAG_DECRYPTED;
245 *crypt_len = IEEE80211_CCMP_HDR_LEN;
247 case IWL_RX_MPDU_STATUS_SEC_TKIP:
248 /* Don't drop the frame and decrypt it in SW */
249 if (!(status & IWL_RX_MPDU_RES_STATUS_TTAK_OK))
252 *crypt_len = IEEE80211_TKIP_IV_LEN;
253 /* fall through if TTAK OK */
254 case IWL_RX_MPDU_STATUS_SEC_WEP:
255 if (!(status & IWL_RX_MPDU_STATUS_ICV_OK))
258 stats->flag |= RX_FLAG_DECRYPTED;
259 if ((status & IWL_RX_MPDU_STATUS_SEC_MASK) ==
260 IWL_RX_MPDU_STATUS_SEC_WEP)
261 *crypt_len = IEEE80211_WEP_IV_LEN;
263 case IWL_RX_MPDU_STATUS_SEC_EXT_ENC:
264 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK))
266 stats->flag |= RX_FLAG_DECRYPTED;
269 IWL_ERR(mvm, "Unhandled alg: 0x%x\n", status);
275 static void iwl_mvm_rx_csum(struct ieee80211_sta *sta,
277 struct iwl_rx_mpdu_desc *desc)
279 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
280 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
282 if (mvmvif->features & NETIF_F_RXCSUM &&
283 desc->l3l4_flags & cpu_to_le16(IWL_RX_L3L4_IP_HDR_CSUM_OK) &&
284 desc->l3l4_flags & cpu_to_le16(IWL_RX_L3L4_TCP_UDP_CSUM_OK))
285 skb->ip_summed = CHECKSUM_UNNECESSARY;
288 void iwl_mvm_rx_mpdu_mq(struct iwl_mvm *mvm, struct napi_struct *napi,
289 struct iwl_rx_cmd_buffer *rxb, int queue)
291 struct ieee80211_rx_status *rx_status;
292 struct iwl_rx_packet *pkt = rxb_addr(rxb);
293 struct iwl_rx_mpdu_desc *desc = (void *)pkt->data;
294 struct ieee80211_hdr *hdr = (void *)(pkt->data + sizeof(*desc));
295 u32 len = le16_to_cpu(desc->mpdu_len);
296 u32 rate_n_flags = le32_to_cpu(desc->rate_n_flags);
297 struct ieee80211_sta *sta = NULL;
301 /* Dont use dev_alloc_skb(), we'll have enough headroom once
302 * ieee80211_hdr pulled.
304 skb = alloc_skb(128, GFP_ATOMIC);
306 IWL_ERR(mvm, "alloc_skb failed\n");
310 rx_status = IEEE80211_SKB_RXCB(skb);
312 if (iwl_mvm_rx_crypto(mvm, hdr, rx_status, desc, queue, &crypt_len)) {
318 * Keep packets with CRC errors (and with overrun) for monitor mode
319 * (otherwise the firmware discards them) but mark them as bad.
321 if (!(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_CRC_OK)) ||
322 !(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_OVERRUN_OK))) {
323 IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n",
324 le16_to_cpu(desc->status));
325 rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
328 rx_status->mactime = le64_to_cpu(desc->tsf_on_air_rise);
329 rx_status->device_timestamp = le32_to_cpu(desc->gp2_on_air_rise);
330 rx_status->band = desc->channel > 14 ? IEEE80211_BAND_5GHZ :
332 rx_status->freq = ieee80211_channel_to_frequency(desc->channel,
334 iwl_mvm_get_signal_strength(mvm, desc, rx_status);
338 if (le16_to_cpu(desc->status) & IWL_RX_MPDU_STATUS_SRC_STA_FOUND) {
339 u8 id = desc->sta_id_flags & IWL_RX_MPDU_SIF_STA_ID_MASK;
341 if (!WARN_ON_ONCE(id >= IWL_MVM_STATION_COUNT)) {
342 sta = rcu_dereference(mvm->fw_id_to_mac_id[id]);
346 } else if (!is_multicast_ether_addr(hdr->addr2)) {
348 * This is fine since we prevent two stations with the same
349 * address from being added.
351 sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL);
355 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
358 * We have tx blocked stations (with CS bit). If we heard
359 * frames from a blocked station on a new channel we can
362 if (unlikely(mvm->csa_tx_block_bcn_timeout))
363 iwl_mvm_sta_modify_disable_tx_ap(mvm, sta, false);
365 rs_update_last_rssi(mvm, &mvmsta->lq_sta, rx_status);
367 if (iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_RSSI) &&
368 ieee80211_is_beacon(hdr->frame_control)) {
369 struct iwl_fw_dbg_trigger_tlv *trig;
370 struct iwl_fw_dbg_trigger_low_rssi *rssi_trig;
374 trig = iwl_fw_dbg_get_trigger(mvm->fw,
375 FW_DBG_TRIGGER_RSSI);
376 rssi_trig = (void *)trig->data;
377 rssi = le32_to_cpu(rssi_trig->rssi);
380 iwl_fw_dbg_trigger_check_stop(mvm, mvmsta->vif,
382 if (trig_check && rx_status->signal < rssi)
383 iwl_mvm_fw_dbg_collect_trig(mvm, trig, NULL);
386 /* TODO: multi queue TCM */
388 if (ieee80211_is_data(hdr->frame_control))
389 iwl_mvm_rx_csum(sta, skb, desc);
394 * Verify we don't have the information in the MPDU descriptor and
395 * that it is not needed.
396 * Make sure for monitor mode that we are on default queue, update
397 * ampdu_ref and the rest of phy info then
400 /* Set up the HT phy flags */
401 switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
402 case RATE_MCS_CHAN_WIDTH_20:
404 case RATE_MCS_CHAN_WIDTH_40:
405 rx_status->flag |= RX_FLAG_40MHZ;
407 case RATE_MCS_CHAN_WIDTH_80:
408 rx_status->vht_flag |= RX_VHT_FLAG_80MHZ;
410 case RATE_MCS_CHAN_WIDTH_160:
411 rx_status->vht_flag |= RX_VHT_FLAG_160MHZ;
414 if (rate_n_flags & RATE_MCS_SGI_MSK)
415 rx_status->flag |= RX_FLAG_SHORT_GI;
416 if (rate_n_flags & RATE_HT_MCS_GF_MSK)
417 rx_status->flag |= RX_FLAG_HT_GF;
418 if (rate_n_flags & RATE_MCS_LDPC_MSK)
419 rx_status->flag |= RX_FLAG_LDPC;
420 if (rate_n_flags & RATE_MCS_HT_MSK) {
421 u8 stbc = (rate_n_flags & RATE_MCS_HT_STBC_MSK) >>
423 rx_status->flag |= RX_FLAG_HT;
424 rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
425 rx_status->flag |= stbc << RX_FLAG_STBC_SHIFT;
426 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
427 u8 stbc = (rate_n_flags & RATE_MCS_VHT_STBC_MSK) >>
430 ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
431 RATE_VHT_MCS_NSS_POS) + 1;
432 rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
433 rx_status->flag |= RX_FLAG_VHT;
434 rx_status->flag |= stbc << RX_FLAG_STBC_SHIFT;
435 if (rate_n_flags & RATE_MCS_BF_MSK)
436 rx_status->vht_flag |= RX_VHT_FLAG_BF;
438 rx_status->rate_idx =
439 iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
443 /* TODO: PHY info - update ampdu queue statistics (for debugfs) */
444 /* TODO: PHY info - gscan */
446 iwl_mvm_create_skb(skb, hdr, len, crypt_len, rxb);
447 iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb, queue, sta);
451 void iwl_mvm_rx_frame_release(struct iwl_mvm *mvm,
452 struct iwl_rx_cmd_buffer *rxb, int queue)