/****************************************************************************** * * This file is provided under a dual BSD/GPLv2 license. When using or * redistributing this file, you may do so under either license. * * GPL LICENSE SUMMARY * * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved. * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH * Copyright(c) 2015 - 2016 Intel Deutschland GmbH * * This program is free software; you can redistribute it and/or modify * it under the terms of version 2 of the GNU General Public License as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * The full GNU General Public License is included in this distribution * in the file called COPYING. * * Contact Information: * Intel Linux Wireless * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 * * BSD LICENSE * * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved. * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH * Copyright(c) 2015 - 2016 Intel Deutschland GmbH * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * Neither the name Intel Corporation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *****************************************************************************/ #include #include #include "iwl-trans.h" #include "mvm.h" #include "fw-api.h" #include "fw-dbg.h" void iwl_mvm_rx_phy_cmd_mq(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb) { mvm->ampdu_ref++; #ifdef CONFIG_IWLWIFI_DEBUGFS if (mvm->last_phy_info.phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) { spin_lock(&mvm->drv_stats_lock); mvm->drv_rx_stats.ampdu_count++; spin_unlock(&mvm->drv_stats_lock); } #endif } static inline int iwl_mvm_check_pn(struct iwl_mvm *mvm, struct sk_buff *skb, int queue, struct ieee80211_sta *sta) { struct iwl_mvm_sta *mvmsta; struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; struct ieee80211_rx_status *stats = IEEE80211_SKB_RXCB(skb); struct iwl_mvm_key_pn *ptk_pn; u8 tid, keyidx; u8 pn[IEEE80211_CCMP_PN_LEN]; u8 *extiv; /* do PN checking */ /* multicast and non-data only arrives on default queue */ if (!ieee80211_is_data(hdr->frame_control) || is_multicast_ether_addr(hdr->addr1)) return 0; /* do not check PN for open AP */ if (!(stats->flag & RX_FLAG_DECRYPTED)) return 0; /* * avoid checking for default queue - we don't want to replicate * all the logic that's necessary for checking the PN on fragmented * frames, leave that to mac80211 */ if (queue == 0) return 0; /* if we are here - this for sure is either CCMP or GCMP */ if (IS_ERR_OR_NULL(sta)) { IWL_ERR(mvm, "expected hw-decrypted unicast frame for station\n"); return -1; } mvmsta = iwl_mvm_sta_from_mac80211(sta); extiv = (u8 *)hdr + ieee80211_hdrlen(hdr->frame_control); keyidx = extiv[3] >> 6; ptk_pn = rcu_dereference(mvmsta->ptk_pn[keyidx]); if (!ptk_pn) return -1; if (ieee80211_is_data_qos(hdr->frame_control)) tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; else tid = 0; /* we don't use HCCA/802.11 QoS TSPECs, so drop such frames */ if (tid >= IWL_MAX_TID_COUNT) return -1; /* load pn */ pn[0] = extiv[7]; pn[1] = extiv[6]; pn[2] = extiv[5]; pn[3] = extiv[4]; pn[4] = extiv[1]; pn[5] = extiv[0]; if (memcmp(pn, ptk_pn->q[queue].pn[tid], IEEE80211_CCMP_PN_LEN) <= 0) return -1; memcpy(ptk_pn->q[queue].pn[tid], pn, IEEE80211_CCMP_PN_LEN); stats->flag |= RX_FLAG_PN_VALIDATED; return 0; } /* iwl_mvm_create_skb Adds the rxb to a new skb */ static void iwl_mvm_create_skb(struct sk_buff *skb, struct ieee80211_hdr *hdr, u16 len, u8 crypt_len, struct iwl_rx_cmd_buffer *rxb) { struct iwl_rx_packet *pkt = rxb_addr(rxb); struct iwl_rx_mpdu_desc *desc = (void *)pkt->data; unsigned int headlen, fraglen, pad_len = 0; unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control); if (desc->mac_flags2 & IWL_RX_MPDU_MFLG2_PAD) pad_len = 2; len -= pad_len; /* If frame is small enough to fit in skb->head, pull it completely. * If not, only pull ieee80211_hdr (including crypto if present, and * an additional 8 bytes for SNAP/ethertype, see below) so that * splice() or TCP coalesce are more efficient. * * Since, in addition, ieee80211_data_to_8023() always pull in at * least 8 bytes (possibly more for mesh) we can do the same here * to save the cost of doing it later. That still doesn't pull in * the actual IP header since the typical case has a SNAP header. * If the latter changes (there are efforts in the standards group * to do so) we should revisit this and ieee80211_data_to_8023(). */ headlen = (len <= skb_tailroom(skb)) ? len : hdrlen + crypt_len + 8; /* The firmware may align the packet to DWORD. * The padding is inserted after the IV. * After copying the header + IV skip the padding if * present before copying packet data. */ hdrlen += crypt_len; memcpy(skb_put(skb, hdrlen), hdr, hdrlen); memcpy(skb_put(skb, headlen - hdrlen), (u8 *)hdr + hdrlen + pad_len, headlen - hdrlen); fraglen = len - headlen; if (fraglen) { int offset = (void *)hdr + headlen + pad_len - rxb_addr(rxb) + rxb_offset(rxb); skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset, fraglen, rxb->truesize); } } /* iwl_mvm_pass_packet_to_mac80211 - passes the packet for mac80211 */ static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm, struct napi_struct *napi, struct sk_buff *skb, int queue, struct ieee80211_sta *sta) { if (iwl_mvm_check_pn(mvm, skb, queue, sta)) kfree_skb(skb); else ieee80211_rx_napi(mvm->hw, NULL, skb, napi); } static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm, struct iwl_rx_mpdu_desc *desc, struct ieee80211_rx_status *rx_status) { int energy_a, energy_b, max_energy; energy_a = desc->energy_a; energy_a = energy_a ? -energy_a : S8_MIN; energy_b = desc->energy_b; energy_b = energy_b ? -energy_b : S8_MIN; max_energy = max(energy_a, energy_b); IWL_DEBUG_STATS(mvm, "energy In A %d B %d, and max %d\n", energy_a, energy_b, max_energy); rx_status->signal = max_energy; rx_status->chains = 0; /* TODO: phy info */ rx_status->chain_signal[0] = energy_a; rx_status->chain_signal[1] = energy_b; rx_status->chain_signal[2] = S8_MIN; } static int iwl_mvm_rx_crypto(struct iwl_mvm *mvm, struct ieee80211_hdr *hdr, struct ieee80211_rx_status *stats, struct iwl_rx_mpdu_desc *desc, int queue, u8 *crypt_len) { u16 status = le16_to_cpu(desc->status); if (!ieee80211_has_protected(hdr->frame_control) || (status & IWL_RX_MPDU_STATUS_SEC_MASK) == IWL_RX_MPDU_STATUS_SEC_NONE) return 0; /* TODO: handle packets encrypted with unknown alg */ switch (status & IWL_RX_MPDU_STATUS_SEC_MASK) { case IWL_RX_MPDU_STATUS_SEC_CCM: case IWL_RX_MPDU_STATUS_SEC_GCM: BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN != IEEE80211_GCMP_PN_LEN); /* alg is CCM: check MIC only */ if (!(status & IWL_RX_MPDU_STATUS_MIC_OK)) return -1; stats->flag |= RX_FLAG_DECRYPTED; *crypt_len = IEEE80211_CCMP_HDR_LEN; return 0; case IWL_RX_MPDU_STATUS_SEC_TKIP: /* Don't drop the frame and decrypt it in SW */ if (!(status & IWL_RX_MPDU_RES_STATUS_TTAK_OK)) return 0; *crypt_len = IEEE80211_TKIP_IV_LEN; /* fall through if TTAK OK */ case IWL_RX_MPDU_STATUS_SEC_WEP: if (!(status & IWL_RX_MPDU_STATUS_ICV_OK)) return -1; stats->flag |= RX_FLAG_DECRYPTED; if ((status & IWL_RX_MPDU_STATUS_SEC_MASK) == IWL_RX_MPDU_STATUS_SEC_WEP) *crypt_len = IEEE80211_WEP_IV_LEN; return 0; case IWL_RX_MPDU_STATUS_SEC_EXT_ENC: if (!(status & IWL_RX_MPDU_STATUS_MIC_OK)) return -1; stats->flag |= RX_FLAG_DECRYPTED; return 0; default: IWL_ERR(mvm, "Unhandled alg: 0x%x\n", status); } return 0; } static void iwl_mvm_rx_csum(struct ieee80211_sta *sta, struct sk_buff *skb, struct iwl_rx_mpdu_desc *desc) { struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif); u16 flags = le16_to_cpu(desc->l3l4_flags); u8 l3_prot = (u8)((flags & IWL_RX_L3L4_L3_PROTO_MASK) >> IWL_RX_L3_PROTO_POS); if (mvmvif->features & NETIF_F_RXCSUM && flags & IWL_RX_L3L4_TCP_UDP_CSUM_OK && (flags & IWL_RX_L3L4_IP_HDR_CSUM_OK || l3_prot == IWL_RX_L3_TYPE_IPV6 || l3_prot == IWL_RX_L3_TYPE_IPV6_FRAG)) skb->ip_summed = CHECKSUM_UNNECESSARY; } /* * returns true if a packet outside BA session is a duplicate and * should be dropped */ static bool iwl_mvm_is_nonagg_dup(struct ieee80211_sta *sta, int queue, struct ieee80211_rx_status *rx_status, struct ieee80211_hdr *hdr, struct iwl_rx_mpdu_desc *desc) { struct iwl_mvm_sta *mvm_sta; struct iwl_mvm_rxq_dup_data *dup_data; u8 baid, tid, sub_frame_idx; if (WARN_ON(IS_ERR_OR_NULL(sta))) return false; baid = (le32_to_cpu(desc->reorder_data) & IWL_RX_MPDU_REORDER_BAID_MASK) >> IWL_RX_MPDU_REORDER_BAID_SHIFT; if (baid != IWL_RX_REORDER_DATA_INVALID_BAID) return false; mvm_sta = iwl_mvm_sta_from_mac80211(sta); dup_data = &mvm_sta->dup_data[queue]; /* * Drop duplicate 802.11 retransmissions * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery") */ if (ieee80211_is_ctl(hdr->frame_control) || ieee80211_is_qos_nullfunc(hdr->frame_control) || is_multicast_ether_addr(hdr->addr1)) { rx_status->flag |= RX_FLAG_DUP_VALIDATED; return false; } if (ieee80211_is_data_qos(hdr->frame_control)) /* frame has qos control */ tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; else tid = IWL_MAX_TID_COUNT; /* If this wasn't a part of an A-MSDU the sub-frame index will be 0 */ sub_frame_idx = desc->amsdu_info & IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK; if (unlikely(ieee80211_has_retry(hdr->frame_control) && dup_data->last_seq[tid] == hdr->seq_ctrl && dup_data->last_sub_frame[tid] >= sub_frame_idx)) return true; dup_data->last_seq[tid] = hdr->seq_ctrl; dup_data->last_sub_frame[tid] = sub_frame_idx; rx_status->flag |= RX_FLAG_DUP_VALIDATED; return false; } int iwl_mvm_notify_rx_queue(struct iwl_mvm *mvm, u32 rxq_mask, const u8 *data, u32 count) { struct iwl_rxq_sync_cmd *cmd; u32 data_size = sizeof(*cmd) + count; int ret; /* should be DWORD aligned */ if (WARN_ON(count & 3 || count > IWL_MULTI_QUEUE_SYNC_MSG_MAX_SIZE)) return -EINVAL; cmd = kzalloc(data_size, GFP_KERNEL); if (!cmd) return -ENOMEM; cmd->rxq_mask = cpu_to_le32(rxq_mask); cmd->count = cpu_to_le32(count); cmd->flags = 0; memcpy(cmd->payload, data, count); ret = iwl_mvm_send_cmd_pdu(mvm, WIDE_ID(DATA_PATH_GROUP, TRIGGER_RX_QUEUES_NOTIF_CMD), 0, data_size, cmd); kfree(cmd); return ret; } void iwl_mvm_rx_queue_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb, int queue) { struct iwl_rx_packet *pkt = rxb_addr(rxb); struct iwl_rxq_sync_notification *notif; struct iwl_mvm_internal_rxq_notif *internal_notif; notif = (void *)pkt->data; internal_notif = (void *)notif->payload; if (internal_notif->sync) { if (mvm->queue_sync_cookie != internal_notif->cookie) { WARN_ONCE(1, "Received expired RX queue sync message\n"); return; } atomic_dec(&mvm->queue_sync_counter); } switch (internal_notif->type) { case IWL_MVM_RXQ_EMPTY: break; case IWL_MVM_RXQ_NOTIF_DEL_BA: break; default: WARN_ONCE(1, "Invalid identifier %d", internal_notif->type); } } void iwl_mvm_rx_mpdu_mq(struct iwl_mvm *mvm, struct napi_struct *napi, struct iwl_rx_cmd_buffer *rxb, int queue) { struct ieee80211_rx_status *rx_status; struct iwl_rx_packet *pkt = rxb_addr(rxb); struct iwl_rx_mpdu_desc *desc = (void *)pkt->data; struct ieee80211_hdr *hdr = (void *)(pkt->data + sizeof(*desc)); u32 len = le16_to_cpu(desc->mpdu_len); u32 rate_n_flags = le32_to_cpu(desc->rate_n_flags); struct ieee80211_sta *sta = NULL; struct sk_buff *skb; u8 crypt_len = 0; /* Dont use dev_alloc_skb(), we'll have enough headroom once * ieee80211_hdr pulled. */ skb = alloc_skb(128, GFP_ATOMIC); if (!skb) { IWL_ERR(mvm, "alloc_skb failed\n"); return; } rx_status = IEEE80211_SKB_RXCB(skb); if (iwl_mvm_rx_crypto(mvm, hdr, rx_status, desc, queue, &crypt_len)) { kfree_skb(skb); return; } /* * Keep packets with CRC errors (and with overrun) for monitor mode * (otherwise the firmware discards them) but mark them as bad. */ if (!(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_CRC_OK)) || !(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_OVERRUN_OK))) { IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n", le16_to_cpu(desc->status)); rx_status->flag |= RX_FLAG_FAILED_FCS_CRC; } rx_status->mactime = le64_to_cpu(desc->tsf_on_air_rise); rx_status->device_timestamp = le32_to_cpu(desc->gp2_on_air_rise); rx_status->band = desc->channel > 14 ? NL80211_BAND_5GHZ : NL80211_BAND_2GHZ; rx_status->freq = ieee80211_channel_to_frequency(desc->channel, rx_status->band); iwl_mvm_get_signal_strength(mvm, desc, rx_status); /* TSF as indicated by the firmware is at INA time */ rx_status->flag |= RX_FLAG_MACTIME_PLCP_START; rcu_read_lock(); if (le16_to_cpu(desc->status) & IWL_RX_MPDU_STATUS_SRC_STA_FOUND) { u8 id = desc->sta_id_flags & IWL_RX_MPDU_SIF_STA_ID_MASK; if (!WARN_ON_ONCE(id >= IWL_MVM_STATION_COUNT)) { sta = rcu_dereference(mvm->fw_id_to_mac_id[id]); if (IS_ERR(sta)) sta = NULL; } } else if (!is_multicast_ether_addr(hdr->addr2)) { /* * This is fine since we prevent two stations with the same * address from being added. */ sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL); } if (sta) { struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); /* * We have tx blocked stations (with CS bit). If we heard * frames from a blocked station on a new channel we can * TX to it again. */ if (unlikely(mvm->csa_tx_block_bcn_timeout)) iwl_mvm_sta_modify_disable_tx_ap(mvm, sta, false); rs_update_last_rssi(mvm, &mvmsta->lq_sta, rx_status); if (iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_RSSI) && ieee80211_is_beacon(hdr->frame_control)) { struct iwl_fw_dbg_trigger_tlv *trig; struct iwl_fw_dbg_trigger_low_rssi *rssi_trig; bool trig_check; s32 rssi; trig = iwl_fw_dbg_get_trigger(mvm->fw, FW_DBG_TRIGGER_RSSI); rssi_trig = (void *)trig->data; rssi = le32_to_cpu(rssi_trig->rssi); trig_check = iwl_fw_dbg_trigger_check_stop(mvm, mvmsta->vif, trig); if (trig_check && rx_status->signal < rssi) iwl_mvm_fw_dbg_collect_trig(mvm, trig, NULL); } /* TODO: multi queue TCM */ if (ieee80211_is_data(hdr->frame_control)) iwl_mvm_rx_csum(sta, skb, desc); if (iwl_mvm_is_nonagg_dup(sta, queue, rx_status, hdr, desc)) { kfree_skb(skb); rcu_read_unlock(); return; } /* * Our hardware de-aggregates AMSDUs but copies the mac header * as it to the de-aggregated MPDUs. We need to turn off the * AMSDU bit in the QoS control ourselves. */ if ((desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU) && !WARN_ON(!ieee80211_is_data_qos(hdr->frame_control))) { u8 *qc = ieee80211_get_qos_ctl(hdr); *qc &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT; } } /* * TODO: PHY info. * Verify we don't have the information in the MPDU descriptor and * that it is not needed. * Make sure for monitor mode that we are on default queue, update * ampdu_ref and the rest of phy info then */ /* Set up the HT phy flags */ switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) { case RATE_MCS_CHAN_WIDTH_20: break; case RATE_MCS_CHAN_WIDTH_40: rx_status->flag |= RX_FLAG_40MHZ; break; case RATE_MCS_CHAN_WIDTH_80: rx_status->vht_flag |= RX_VHT_FLAG_80MHZ; break; case RATE_MCS_CHAN_WIDTH_160: rx_status->vht_flag |= RX_VHT_FLAG_160MHZ; break; } if (rate_n_flags & RATE_MCS_SGI_MSK) rx_status->flag |= RX_FLAG_SHORT_GI; if (rate_n_flags & RATE_HT_MCS_GF_MSK) rx_status->flag |= RX_FLAG_HT_GF; if (rate_n_flags & RATE_MCS_LDPC_MSK) rx_status->flag |= RX_FLAG_LDPC; if (rate_n_flags & RATE_MCS_HT_MSK) { u8 stbc = (rate_n_flags & RATE_MCS_HT_STBC_MSK) >> RATE_MCS_STBC_POS; rx_status->flag |= RX_FLAG_HT; rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK; rx_status->flag |= stbc << RX_FLAG_STBC_SHIFT; } else if (rate_n_flags & RATE_MCS_VHT_MSK) { u8 stbc = (rate_n_flags & RATE_MCS_VHT_STBC_MSK) >> RATE_MCS_STBC_POS; rx_status->vht_nss = ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >> RATE_VHT_MCS_NSS_POS) + 1; rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK; rx_status->flag |= RX_FLAG_VHT; rx_status->flag |= stbc << RX_FLAG_STBC_SHIFT; if (rate_n_flags & RATE_MCS_BF_MSK) rx_status->vht_flag |= RX_VHT_FLAG_BF; } else { rx_status->rate_idx = iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags, rx_status->band); } /* TODO: PHY info - update ampdu queue statistics (for debugfs) */ /* TODO: PHY info - gscan */ iwl_mvm_create_skb(skb, hdr, len, crypt_len, rxb); iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb, queue, sta); rcu_read_unlock(); } void iwl_mvm_rx_frame_release(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb, int queue) { /* TODO */ }