/******************************************************************************
 *
 * 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) 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
 * USA
 *
 * The full GNU General Public License is included in this distribution
 * in the file called COPYING.
 *
 * Contact Information:
 *  Intel Linux Wireless <linuxwifi@intel.com>
 * 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) 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 <linux/etherdevice.h>
#include <linux/ip.h>
#include <linux/fs.h>
#include <net/cfg80211.h>
#include <net/ipv6.h>
#include <net/tcp.h>
#include <net/addrconf.h>
#include "iwl-modparams.h"
#include "fw-api.h"
#include "mvm.h"

void iwl_mvm_set_rekey_data(struct ieee80211_hw *hw,
                            struct ieee80211_vif *vif,
                            struct cfg80211_gtk_rekey_data *data)
{
        struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);

        if (iwlwifi_mod_params.sw_crypto)
                return;

        mutex_lock(&mvm->mutex);

        memcpy(mvmvif->rekey_data.kek, data->kek, NL80211_KEK_LEN);
        memcpy(mvmvif->rekey_data.kck, data->kck, NL80211_KCK_LEN);
        mvmvif->rekey_data.replay_ctr =
                cpu_to_le64(be64_to_cpup((__be64 *)data->replay_ctr));
        mvmvif->rekey_data.valid = true;

        mutex_unlock(&mvm->mutex);
}

#if IS_ENABLED(CONFIG_IPV6)
void iwl_mvm_ipv6_addr_change(struct ieee80211_hw *hw,
                              struct ieee80211_vif *vif,
                              struct inet6_dev *idev)
{
        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
        struct inet6_ifaddr *ifa;
        int idx = 0;

        memset(mvmvif->tentative_addrs, 0, sizeof(mvmvif->tentative_addrs));

        read_lock_bh(&idev->lock);
        list_for_each_entry(ifa, &idev->addr_list, if_list) {
                mvmvif->target_ipv6_addrs[idx] = ifa->addr;
                if (ifa->flags & IFA_F_TENTATIVE)
                        __set_bit(idx, mvmvif->tentative_addrs);
                idx++;
                if (idx >= IWL_PROTO_OFFLOAD_NUM_IPV6_ADDRS_MAX)
                        break;
        }
        read_unlock_bh(&idev->lock);

        mvmvif->num_target_ipv6_addrs = idx;
}
#endif

void iwl_mvm_set_default_unicast_key(struct ieee80211_hw *hw,
                                     struct ieee80211_vif *vif, int idx)
{
        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);

        mvmvif->tx_key_idx = idx;
}

static void iwl_mvm_convert_p1k(u16 *p1k, __le16 *out)
{
        int i;

        for (i = 0; i < IWL_P1K_SIZE; i++)
                out[i] = cpu_to_le16(p1k[i]);
}

static const u8 *iwl_mvm_find_max_pn(struct ieee80211_key_conf *key,
                                     struct iwl_mvm_key_pn *ptk_pn,
                                     struct ieee80211_key_seq *seq,
                                     int tid, int queues)
{
        const u8 *ret = seq->ccmp.pn;
        int i;

        /* get the PN from mac80211, used on the default queue */
        ieee80211_get_key_rx_seq(key, tid, seq);

        /* and use the internal data for the other queues */
        for (i = 1; i < queues; i++) {
                const u8 *tmp = ptk_pn->q[i].pn[tid];

                if (memcmp(ret, tmp, IEEE80211_CCMP_PN_LEN) <= 0)
                        ret = tmp;
        }

        return ret;
}

struct wowlan_key_data {
        struct iwl_wowlan_rsc_tsc_params_cmd *rsc_tsc;
        struct iwl_wowlan_tkip_params_cmd *tkip;
        bool error, use_rsc_tsc, use_tkip, configure_keys;
        int wep_key_idx;
};

static void iwl_mvm_wowlan_program_keys(struct ieee80211_hw *hw,
                                        struct ieee80211_vif *vif,
                                        struct ieee80211_sta *sta,
                                        struct ieee80211_key_conf *key,
                                        void *_data)
{
        struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
        struct wowlan_key_data *data = _data;
        struct aes_sc *aes_sc, *aes_tx_sc = NULL;
        struct tkip_sc *tkip_sc, *tkip_tx_sc = NULL;
        struct iwl_p1k_cache *rx_p1ks;
        u8 *rx_mic_key;
        struct ieee80211_key_seq seq;
        u32 cur_rx_iv32 = 0;
        u16 p1k[IWL_P1K_SIZE];
        int ret, i;

        switch (key->cipher) {
        case WLAN_CIPHER_SUITE_WEP40:
        case WLAN_CIPHER_SUITE_WEP104: { /* hack it for now */
                struct {
                        struct iwl_mvm_wep_key_cmd wep_key_cmd;
                        struct iwl_mvm_wep_key wep_key;
                } __packed wkc = {
                        .wep_key_cmd.mac_id_n_color =
                                cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id,
                                                                mvmvif->color)),
                        .wep_key_cmd.num_keys = 1,
                        /* firmware sets STA_KEY_FLG_WEP_13BYTES */
                        .wep_key_cmd.decryption_type = STA_KEY_FLG_WEP,
                        .wep_key.key_index = key->keyidx,
                        .wep_key.key_size = key->keylen,
                };

                /*
                 * This will fail -- the key functions don't set support
                 * pairwise WEP keys. However, that's better than silently
                 * failing WoWLAN. Or maybe not?
                 */
                if (key->flags & IEEE80211_KEY_FLAG_PAIRWISE)
                        break;

                memcpy(&wkc.wep_key.key[3], key->key, key->keylen);
                if (key->keyidx == mvmvif->tx_key_idx) {
                        /* TX key must be at offset 0 */
                        wkc.wep_key.key_offset = 0;
                } else {
                        /* others start at 1 */
                        data->wep_key_idx++;
                        wkc.wep_key.key_offset = data->wep_key_idx;
                }

                if (data->configure_keys) {
                        mutex_lock(&mvm->mutex);
                        ret = iwl_mvm_send_cmd_pdu(mvm, WEP_KEY, 0,
                                                   sizeof(wkc), &wkc);
                        data->error = ret != 0;

                        mvm->ptk_ivlen = key->iv_len;
                        mvm->ptk_icvlen = key->icv_len;
                        mvm->gtk_ivlen = key->iv_len;
                        mvm->gtk_icvlen = key->icv_len;
                        mutex_unlock(&mvm->mutex);
                }

                /* don't upload key again */
                return;
        }
        default:
                data->error = true;
                return;
        case WLAN_CIPHER_SUITE_AES_CMAC:
                /*
                 * Ignore CMAC keys -- the WoWLAN firmware doesn't support them
                 * but we also shouldn't abort suspend due to that. It does have
                 * support for the IGTK key renewal, but doesn't really use the
                 * IGTK for anything. This means we could spuriously wake up or
                 * be deauthenticated, but that was considered acceptable.
                 */
                return;
        case WLAN_CIPHER_SUITE_TKIP:
                if (sta) {
                        u64 pn64;

                        tkip_sc = data->rsc_tsc->all_tsc_rsc.tkip.unicast_rsc;
                        tkip_tx_sc = &data->rsc_tsc->all_tsc_rsc.tkip.tsc;

                        rx_p1ks = data->tkip->rx_uni;

                        pn64 = atomic64_read(&key->tx_pn);
                        tkip_tx_sc->iv16 = cpu_to_le16(TKIP_PN_TO_IV16(pn64));
                        tkip_tx_sc->iv32 = cpu_to_le32(TKIP_PN_TO_IV32(pn64));

                        ieee80211_get_tkip_p1k_iv(key, TKIP_PN_TO_IV32(pn64),
                                                  p1k);
                        iwl_mvm_convert_p1k(p1k, data->tkip->tx.p1k);

                        memcpy(data->tkip->mic_keys.tx,
                               &key->key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY],
                               IWL_MIC_KEY_SIZE);

                        rx_mic_key = data->tkip->mic_keys.rx_unicast;
                } else {
                        tkip_sc =
                                data->rsc_tsc->all_tsc_rsc.tkip.multicast_rsc;
                        rx_p1ks = data->tkip->rx_multi;
                        rx_mic_key = data->tkip->mic_keys.rx_mcast;
                }

                /*
                 * For non-QoS this relies on the fact that both the uCode and
                 * mac80211 use TID 0 (as they need to to avoid replay attacks)
                 * for checking the IV in the frames.
                 */
                for (i = 0; i < IWL_NUM_RSC; i++) {
                        ieee80211_get_key_rx_seq(key, i, &seq);
                        tkip_sc[i].iv16 = cpu_to_le16(seq.tkip.iv16);
                        tkip_sc[i].iv32 = cpu_to_le32(seq.tkip.iv32);
                        /* wrapping isn't allowed, AP must rekey */
                        if (seq.tkip.iv32 > cur_rx_iv32)
                                cur_rx_iv32 = seq.tkip.iv32;
                }

                ieee80211_get_tkip_rx_p1k(key, vif->bss_conf.bssid,
                                          cur_rx_iv32, p1k);
                iwl_mvm_convert_p1k(p1k, rx_p1ks[0].p1k);
                ieee80211_get_tkip_rx_p1k(key, vif->bss_conf.bssid,
                                          cur_rx_iv32 + 1, p1k);
                iwl_mvm_convert_p1k(p1k, rx_p1ks[1].p1k);

                memcpy(rx_mic_key,
                       &key->key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY],
                       IWL_MIC_KEY_SIZE);

                data->use_tkip = true;
                data->use_rsc_tsc = true;
                break;
        case WLAN_CIPHER_SUITE_CCMP:
                if (sta) {
                        u64 pn64;

                        aes_sc = data->rsc_tsc->all_tsc_rsc.aes.unicast_rsc;
                        aes_tx_sc = &data->rsc_tsc->all_tsc_rsc.aes.tsc;

                        pn64 = atomic64_read(&key->tx_pn);
                        aes_tx_sc->pn = cpu_to_le64(pn64);
                } else {
                        aes_sc = data->rsc_tsc->all_tsc_rsc.aes.multicast_rsc;
                }

                /*
                 * For non-QoS this relies on the fact that both the uCode and
                 * mac80211/our RX code use TID 0 for checking the PN.
                 */
                if (sta && iwl_mvm_has_new_rx_api(mvm)) {
                        struct iwl_mvm_sta *mvmsta;
                        struct iwl_mvm_key_pn *ptk_pn;
                        const u8 *pn;

                        mvmsta = iwl_mvm_sta_from_mac80211(sta);
                        ptk_pn = rcu_dereference_protected(
                                                mvmsta->ptk_pn[key->keyidx],
                                                lockdep_is_held(&mvm->mutex));
                        if (WARN_ON(!ptk_pn))
                                break;

                        for (i = 0; i < IWL_MAX_TID_COUNT; i++) {
                                pn = iwl_mvm_find_max_pn(key, ptk_pn, &seq, i,
                                                mvm->trans->num_rx_queues);
                                aes_sc[i].pn = cpu_to_le64((u64)pn[5] |
                                                           ((u64)pn[4] << 8) |
                                                           ((u64)pn[3] << 16) |
                                                           ((u64)pn[2] << 24) |
                                                           ((u64)pn[1] << 32) |
                                                           ((u64)pn[0] << 40));
                        }
                } else {
                        for (i = 0; i < IWL_NUM_RSC; i++) {
                                u8 *pn = seq.ccmp.pn;

                                ieee80211_get_key_rx_seq(key, i, &seq);
                                aes_sc[i].pn = cpu_to_le64((u64)pn[5] |
                                                           ((u64)pn[4] << 8) |
                                                           ((u64)pn[3] << 16) |
                                                           ((u64)pn[2] << 24) |
                                                           ((u64)pn[1] << 32) |
                                                           ((u64)pn[0] << 40));
                        }
                }
                data->use_rsc_tsc = true;
                break;
        }

        if (data->configure_keys) {
                mutex_lock(&mvm->mutex);
                /*
                 * The D3 firmware hardcodes the key offset 0 as the key it
                 * uses to transmit packets to the AP, i.e. the PTK.
                 */
                if (key->flags & IEEE80211_KEY_FLAG_PAIRWISE) {
                        mvm->ptk_ivlen = key->iv_len;
                        mvm->ptk_icvlen = key->icv_len;
                        ret = iwl_mvm_set_sta_key(mvm, vif, sta, key, 0);
                } else {
                        /*
                         * firmware only supports TSC/RSC for a single key,
                         * so if there are multiple keep overwriting them
                         * with new ones -- this relies on mac80211 doing
                         * list_add_tail().
                         */
                        mvm->gtk_ivlen = key->iv_len;
                        mvm->gtk_icvlen = key->icv_len;
                        ret = iwl_mvm_set_sta_key(mvm, vif, sta, key, 1);
                }
                mutex_unlock(&mvm->mutex);
                data->error = ret != 0;
        }
}

static int iwl_mvm_send_patterns(struct iwl_mvm *mvm,
                                 struct cfg80211_wowlan *wowlan)
{
        struct iwl_wowlan_patterns_cmd *pattern_cmd;
        struct iwl_host_cmd cmd = {
                .id = WOWLAN_PATTERNS,
                .dataflags[0] = IWL_HCMD_DFL_NOCOPY,
        };
        int i, err;

        if (!wowlan->n_patterns)
                return 0;

        cmd.len[0] = sizeof(*pattern_cmd) +
                wowlan->n_patterns * sizeof(struct iwl_wowlan_pattern);

        pattern_cmd = kmalloc(cmd.len[0], GFP_KERNEL);
        if (!pattern_cmd)
                return -ENOMEM;

        pattern_cmd->n_patterns = cpu_to_le32(wowlan->n_patterns);

        for (i = 0; i < wowlan->n_patterns; i++) {
                int mask_len = DIV_ROUND_UP(wowlan->patterns[i].pattern_len, 8);

                memcpy(&pattern_cmd->patterns[i].mask,
                       wowlan->patterns[i].mask, mask_len);
                memcpy(&pattern_cmd->patterns[i].pattern,
                       wowlan->patterns[i].pattern,
                       wowlan->patterns[i].pattern_len);
                pattern_cmd->patterns[i].mask_size = mask_len;
                pattern_cmd->patterns[i].pattern_size =
                        wowlan->patterns[i].pattern_len;
        }

        cmd.data[0] = pattern_cmd;
        err = iwl_mvm_send_cmd(mvm, &cmd);
        kfree(pattern_cmd);
        return err;
}

enum iwl_mvm_tcp_packet_type {
        MVM_TCP_TX_SYN,
        MVM_TCP_RX_SYNACK,
        MVM_TCP_TX_DATA,
        MVM_TCP_RX_ACK,
        MVM_TCP_RX_WAKE,
        MVM_TCP_TX_FIN,
};

static __le16 pseudo_hdr_check(int len, __be32 saddr, __be32 daddr)
{
        __sum16 check = tcp_v4_check(len, saddr, daddr, 0);
        return cpu_to_le16(be16_to_cpu((__force __be16)check));
}

static void iwl_mvm_build_tcp_packet(struct ieee80211_vif *vif,
                                     struct cfg80211_wowlan_tcp *tcp,
                                     void *_pkt, u8 *mask,
                                     __le16 *pseudo_hdr_csum,
                                     enum iwl_mvm_tcp_packet_type ptype)
{
        struct {
                struct ethhdr eth;
                struct iphdr ip;
                struct tcphdr tcp;
                u8 data[];
        } __packed *pkt = _pkt;
        u16 ip_tot_len = sizeof(struct iphdr) + sizeof(struct tcphdr);
        int i;

        pkt->eth.h_proto = cpu_to_be16(ETH_P_IP),
        pkt->ip.version = 4;
        pkt->ip.ihl = 5;
        pkt->ip.protocol = IPPROTO_TCP;

        switch (ptype) {
        case MVM_TCP_TX_SYN:
        case MVM_TCP_TX_DATA:
        case MVM_TCP_TX_FIN:
                memcpy(pkt->eth.h_dest, tcp->dst_mac, ETH_ALEN);
                memcpy(pkt->eth.h_source, vif->addr, ETH_ALEN);
                pkt->ip.ttl = 128;
                pkt->ip.saddr = tcp->src;
                pkt->ip.daddr = tcp->dst;
                pkt->tcp.source = cpu_to_be16(tcp->src_port);
                pkt->tcp.dest = cpu_to_be16(tcp->dst_port);
                /* overwritten for TX SYN later */
                pkt->tcp.doff = sizeof(struct tcphdr) / 4;
                pkt->tcp.window = cpu_to_be16(65000);
                break;
        case MVM_TCP_RX_SYNACK:
        case MVM_TCP_RX_ACK:
        case MVM_TCP_RX_WAKE:
                memcpy(pkt->eth.h_dest, vif->addr, ETH_ALEN);
                memcpy(pkt->eth.h_source, tcp->dst_mac, ETH_ALEN);
                pkt->ip.saddr = tcp->dst;
                pkt->ip.daddr = tcp->src;
                pkt->tcp.source = cpu_to_be16(tcp->dst_port);
                pkt->tcp.dest = cpu_to_be16(tcp->src_port);
                break;
        default:
                WARN_ON(1);
                return;
        }

        switch (ptype) {
        case MVM_TCP_TX_SYN:
                /* firmware assumes 8 option bytes - 8 NOPs for now */
                memset(pkt->data, 0x01, 8);
                ip_tot_len += 8;
                pkt->tcp.doff = (sizeof(struct tcphdr) + 8) / 4;
                pkt->tcp.syn = 1;
                break;
        case MVM_TCP_TX_DATA:
                ip_tot_len += tcp->payload_len;
                memcpy(pkt->data, tcp->payload, tcp->payload_len);
                pkt->tcp.psh = 1;
                pkt->tcp.ack = 1;
                break;
        case MVM_TCP_TX_FIN:
                pkt->tcp.fin = 1;
                pkt->tcp.ack = 1;
                break;
        case MVM_TCP_RX_SYNACK:
                pkt->tcp.syn = 1;
                pkt->tcp.ack = 1;
                break;
        case MVM_TCP_RX_ACK:
                pkt->tcp.ack = 1;
                break;
        case MVM_TCP_RX_WAKE:
                ip_tot_len += tcp->wake_len;
                pkt->tcp.psh = 1;
                pkt->tcp.ack = 1;
                memcpy(pkt->data, tcp->wake_data, tcp->wake_len);
                break;
        }

        switch (ptype) {
        case MVM_TCP_TX_SYN:
        case MVM_TCP_TX_DATA:
        case MVM_TCP_TX_FIN:
                pkt->ip.tot_len = cpu_to_be16(ip_tot_len);
                pkt->ip.check = ip_fast_csum(&pkt->ip, pkt->ip.ihl);
                break;
        case MVM_TCP_RX_WAKE:
                for (i = 0; i < DIV_ROUND_UP(tcp->wake_len, 8); i++) {
                        u8 tmp = tcp->wake_mask[i];
                        mask[i + 6] |= tmp << 6;
                        if (i + 1 < DIV_ROUND_UP(tcp->wake_len, 8))
                                mask[i + 7] = tmp >> 2;
                }
                /* fall through for ethernet/IP/TCP headers mask */
        case MVM_TCP_RX_SYNACK:
        case MVM_TCP_RX_ACK:
                mask[0] = 0xff; /* match ethernet */
                /*
                 * match ethernet, ip.version, ip.ihl
                 * the ip.ihl half byte is really masked out by firmware
                 */
                mask[1] = 0x7f;
                mask[2] = 0x80; /* match ip.protocol */
                mask[3] = 0xfc; /* match ip.saddr, ip.daddr */
                mask[4] = 0x3f; /* match ip.daddr, tcp.source, tcp.dest */
                mask[5] = 0x80; /* match tcp flags */
                /* leave rest (0 or set for MVM_TCP_RX_WAKE) */
                break;
        };

        *pseudo_hdr_csum = pseudo_hdr_check(ip_tot_len - sizeof(struct iphdr),
                                            pkt->ip.saddr, pkt->ip.daddr);
}

static int iwl_mvm_send_remote_wake_cfg(struct iwl_mvm *mvm,
                                        struct ieee80211_vif *vif,
                                        struct cfg80211_wowlan_tcp *tcp)
{
        struct iwl_wowlan_remote_wake_config *cfg;
        struct iwl_host_cmd cmd = {
                .id = REMOTE_WAKE_CONFIG_CMD,
                .len = { sizeof(*cfg), },
                .dataflags = { IWL_HCMD_DFL_NOCOPY, },
        };
        int ret;

        if (!tcp)
                return 0;

        cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
        if (!cfg)
                return -ENOMEM;
        cmd.data[0] = cfg;

        cfg->max_syn_retries = 10;
        cfg->max_data_retries = 10;
        cfg->tcp_syn_ack_timeout = 1; /* seconds */
        cfg->tcp_ack_timeout = 1; /* seconds */

        /* SYN (TX) */
        iwl_mvm_build_tcp_packet(
                vif, tcp, cfg->syn_tx.data, NULL,
                &cfg->syn_tx.info.tcp_pseudo_header_checksum,
                MVM_TCP_TX_SYN);
        cfg->syn_tx.info.tcp_payload_length = 0;

        /* SYN/ACK (RX) */
        iwl_mvm_build_tcp_packet(
                vif, tcp, cfg->synack_rx.data, cfg->synack_rx.rx_mask,
                &cfg->synack_rx.info.tcp_pseudo_header_checksum,
                MVM_TCP_RX_SYNACK);
        cfg->synack_rx.info.tcp_payload_length = 0;

        /* KEEPALIVE/ACK (TX) */
        iwl_mvm_build_tcp_packet(
                vif, tcp, cfg->keepalive_tx.data, NULL,
                &cfg->keepalive_tx.info.tcp_pseudo_header_checksum,
                MVM_TCP_TX_DATA);
        cfg->keepalive_tx.info.tcp_payload_length =
                cpu_to_le16(tcp->payload_len);
        cfg->sequence_number_offset = tcp->payload_seq.offset;
        /* length must be 0..4, the field is little endian */
        cfg->sequence_number_length = tcp->payload_seq.len;
        cfg->initial_sequence_number = cpu_to_le32(tcp->payload_seq.start);
        cfg->keepalive_interval = cpu_to_le16(tcp->data_interval);
        if (tcp->payload_tok.len) {
                cfg->token_offset = tcp->payload_tok.offset;
                cfg->token_length = tcp->payload_tok.len;
                cfg->num_tokens =
                        cpu_to_le16(tcp->tokens_size % tcp->payload_tok.len);
                memcpy(cfg->tokens, tcp->payload_tok.token_stream,
                       tcp->tokens_size);
        } else {
                /* set tokens to max value to almost never run out */
                cfg->num_tokens = cpu_to_le16(65535);
        }

        /* ACK (RX) */
        iwl_mvm_build_tcp_packet(
                vif, tcp, cfg->keepalive_ack_rx.data,
                cfg->keepalive_ack_rx.rx_mask,
                &cfg->keepalive_ack_rx.info.tcp_pseudo_header_checksum,
                MVM_TCP_RX_ACK);
        cfg->keepalive_ack_rx.info.tcp_payload_length = 0;

        /* WAKEUP (RX) */
        iwl_mvm_build_tcp_packet(
                vif, tcp, cfg->wake_rx.data, cfg->wake_rx.rx_mask,
                &cfg->wake_rx.info.tcp_pseudo_header_checksum,
                MVM_TCP_RX_WAKE);
        cfg->wake_rx.info.tcp_payload_length =
                cpu_to_le16(tcp->wake_len);

        /* FIN */
        iwl_mvm_build_tcp_packet(
                vif, tcp, cfg->fin_tx.data, NULL,
                &cfg->fin_tx.info.tcp_pseudo_header_checksum,
                MVM_TCP_TX_FIN);
        cfg->fin_tx.info.tcp_payload_length = 0;

        ret = iwl_mvm_send_cmd(mvm, &cmd);
        kfree(cfg);

        return ret;
}

static int iwl_mvm_d3_reprogram(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
                                struct ieee80211_sta *ap_sta)
{
        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
        struct ieee80211_chanctx_conf *ctx;
        u8 chains_static, chains_dynamic;
        struct cfg80211_chan_def chandef;
        int ret, i;
        struct iwl_binding_cmd binding_cmd = {};
        struct iwl_time_quota_cmd quota_cmd = {};
        u32 status;
        int size;

        if (fw_has_capa(&mvm->fw->ucode_capa,
                        IWL_UCODE_TLV_CAPA_BINDING_CDB_SUPPORT)) {
                size = sizeof(binding_cmd);
                if (mvmvif->phy_ctxt->channel->band == NL80211_BAND_2GHZ ||
                    !iwl_mvm_is_cdb_supported(mvm))
                        binding_cmd.lmac_id = cpu_to_le32(IWL_LMAC_24G_INDEX);
                else
                        binding_cmd.lmac_id = cpu_to_le32(IWL_LMAC_5G_INDEX);
        } else {
                size = IWL_BINDING_CMD_SIZE_V1;
        }

        /* add back the PHY */
        if (WARN_ON(!mvmvif->phy_ctxt))
                return -EINVAL;

        rcu_read_lock();
        ctx = rcu_dereference(vif->chanctx_conf);
        if (WARN_ON(!ctx)) {
                rcu_read_unlock();
                return -EINVAL;
        }
        chandef = ctx->def;
        chains_static = ctx->rx_chains_static;
        chains_dynamic = ctx->rx_chains_dynamic;
        rcu_read_unlock();

        ret = iwl_mvm_phy_ctxt_add(mvm, mvmvif->phy_ctxt, &chandef,
                                   chains_static, chains_dynamic);
        if (ret)
                return ret;

        /* add back the MAC */
        mvmvif->uploaded = false;

        if (WARN_ON(!vif->bss_conf.assoc))
                return -EINVAL;

        ret = iwl_mvm_mac_ctxt_add(mvm, vif);
        if (ret)
                return ret;

        /* add back binding - XXX refactor? */
        binding_cmd.id_and_color =
                cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->phy_ctxt->id,
                                                mvmvif->phy_ctxt->color));
        binding_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
        binding_cmd.phy =
                cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->phy_ctxt->id,
                                                mvmvif->phy_ctxt->color));
        binding_cmd.macs[0] = cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id,
                                                              mvmvif->color));
        for (i = 1; i < MAX_MACS_IN_BINDING; i++)
                binding_cmd.macs[i] = cpu_to_le32(FW_CTXT_INVALID);

        status = 0;
        ret = iwl_mvm_send_cmd_pdu_status(mvm, BINDING_CONTEXT_CMD,
                                          size, &binding_cmd, &status);
        if (ret) {
                IWL_ERR(mvm, "Failed to add binding: %d\n", ret);
                return ret;
        }

        if (status) {
                IWL_ERR(mvm, "Binding command failed: %u\n", status);
                return -EIO;
        }

        ret = iwl_mvm_sta_send_to_fw(mvm, ap_sta, false, 0);
        if (ret)
                return ret;
        rcu_assign_pointer(mvm->fw_id_to_mac_id[mvmvif->ap_sta_id], ap_sta);

        ret = iwl_mvm_mac_ctxt_changed(mvm, vif, false, NULL);
        if (ret)
                return ret;

        /* and some quota */
        quota_cmd.quotas[0].id_and_color =
                cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->phy_ctxt->id,
                                                mvmvif->phy_ctxt->color));
        quota_cmd.quotas[0].quota = cpu_to_le32(IWL_MVM_MAX_QUOTA);
        quota_cmd.quotas[0].max_duration = cpu_to_le32(IWL_MVM_MAX_QUOTA);

        for (i = 1; i < MAX_BINDINGS; i++)
                quota_cmd.quotas[i].id_and_color = cpu_to_le32(FW_CTXT_INVALID);

        ret = iwl_mvm_send_cmd_pdu(mvm, TIME_QUOTA_CMD, 0,
                                   sizeof(quota_cmd), &quota_cmd);
        if (ret)
                IWL_ERR(mvm, "Failed to send quota: %d\n", ret);

        if (iwl_mvm_is_lar_supported(mvm) && iwl_mvm_init_fw_regd(mvm))
                IWL_ERR(mvm, "Failed to initialize D3 LAR information\n");

        return 0;
}

static int iwl_mvm_get_last_nonqos_seq(struct iwl_mvm *mvm,
                                       struct ieee80211_vif *vif)
{
        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
        struct iwl_nonqos_seq_query_cmd query_cmd = {
                .get_set_flag = cpu_to_le32(IWL_NONQOS_SEQ_GET),
                .mac_id_n_color =
                        cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id,
                                                        mvmvif->color)),
        };
        struct iwl_host_cmd cmd = {
                .id = NON_QOS_TX_COUNTER_CMD,
                .flags = CMD_WANT_SKB,
        };
        int err;
        u32 size;

        cmd.data[0] = &query_cmd;
        cmd.len[0] = sizeof(query_cmd);

        err = iwl_mvm_send_cmd(mvm, &cmd);
        if (err)
                return err;

        size = iwl_rx_packet_payload_len(cmd.resp_pkt);
        if (size < sizeof(__le16)) {
                err = -EINVAL;
        } else {
                err = le16_to_cpup((__le16 *)cmd.resp_pkt->data);
                /* firmware returns next, not last-used seqno */
                err = (u16) (err - 0x10);
        }

        iwl_free_resp(&cmd);
        return err;
}

void iwl_mvm_set_last_nonqos_seq(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
{
        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
        struct iwl_nonqos_seq_query_cmd query_cmd = {
                .get_set_flag = cpu_to_le32(IWL_NONQOS_SEQ_SET),
                .mac_id_n_color =
                        cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id,
                                                        mvmvif->color)),
                .value = cpu_to_le16(mvmvif->seqno),
        };

        /* return if called during restart, not resume from D3 */
        if (!mvmvif->seqno_valid)
                return;

        mvmvif->seqno_valid = false;

        if (iwl_mvm_send_cmd_pdu(mvm, NON_QOS_TX_COUNTER_CMD, 0,
                                 sizeof(query_cmd), &query_cmd))
                IWL_ERR(mvm, "failed to set non-QoS seqno\n");
}

static int iwl_mvm_switch_to_d3(struct iwl_mvm *mvm)
{
        iwl_mvm_scan_stop(mvm, IWL_MVM_SCAN_REGULAR, true);

        iwl_mvm_stop_device(mvm);
        /*
         * Set the HW restart bit -- this is mostly true as we're
         * going to load new firmware and reprogram that, though
         * the reprogramming is going to be manual to avoid adding
         * all the MACs that aren't support.
         * We don't have to clear up everything though because the
         * reprogramming is manual. When we resume, we'll actually
         * go through a proper restart sequence again to switch
         * back to the runtime firmware image.
         */
        set_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status);

        /* the fw is reset, so all the keys are cleared */
        memset(mvm->fw_key_table, 0, sizeof(mvm->fw_key_table));

        mvm->ptk_ivlen = 0;
        mvm->ptk_icvlen = 0;
        mvm->ptk_ivlen = 0;
        mvm->ptk_icvlen = 0;

        return iwl_mvm_load_d3_fw(mvm);
}

static int
iwl_mvm_get_wowlan_config(struct iwl_mvm *mvm,
                          struct cfg80211_wowlan *wowlan,
                          struct iwl_wowlan_config_cmd *wowlan_config_cmd,
                          struct ieee80211_vif *vif, struct iwl_mvm_vif *mvmvif,
                          struct ieee80211_sta *ap_sta)
{
        int ret;
        struct iwl_mvm_sta *mvm_ap_sta = iwl_mvm_sta_from_mac80211(ap_sta);

        /* TODO: wowlan_config_cmd->wowlan_ba_teardown_tids */

        wowlan_config_cmd->is_11n_connection =
                                        ap_sta->ht_cap.ht_supported;
        wowlan_config_cmd->flags = ENABLE_L3_FILTERING |
                ENABLE_NBNS_FILTERING | ENABLE_DHCP_FILTERING;

        /* Query the last used seqno and set it */
        ret = iwl_mvm_get_last_nonqos_seq(mvm, vif);
        if (ret < 0)
                return ret;

        wowlan_config_cmd->non_qos_seq = cpu_to_le16(ret);

        iwl_mvm_set_wowlan_qos_seq(mvm_ap_sta, wowlan_config_cmd);

        if (wowlan->disconnect)
                wowlan_config_cmd->wakeup_filter |=
                        cpu_to_le32(IWL_WOWLAN_WAKEUP_BEACON_MISS |
                                    IWL_WOWLAN_WAKEUP_LINK_CHANGE);
        if (wowlan->magic_pkt)
                wowlan_config_cmd->wakeup_filter |=
                        cpu_to_le32(IWL_WOWLAN_WAKEUP_MAGIC_PACKET);
        if (wowlan->gtk_rekey_failure)
                wowlan_config_cmd->wakeup_filter |=
                        cpu_to_le32(IWL_WOWLAN_WAKEUP_GTK_REKEY_FAIL);
        if (wowlan->eap_identity_req)
                wowlan_config_cmd->wakeup_filter |=
                        cpu_to_le32(IWL_WOWLAN_WAKEUP_EAP_IDENT_REQ);
        if (wowlan->four_way_handshake)
                wowlan_config_cmd->wakeup_filter |=
                        cpu_to_le32(IWL_WOWLAN_WAKEUP_4WAY_HANDSHAKE);
        if (wowlan->n_patterns)
                wowlan_config_cmd->wakeup_filter |=
                        cpu_to_le32(IWL_WOWLAN_WAKEUP_PATTERN_MATCH);

        if (wowlan->rfkill_release)
                wowlan_config_cmd->wakeup_filter |=
                        cpu_to_le32(IWL_WOWLAN_WAKEUP_RF_KILL_DEASSERT);

        if (wowlan->tcp) {
                /*
                 * Set the "link change" (really "link lost") flag as well
                 * since that implies losing the TCP connection.
                 */
                wowlan_config_cmd->wakeup_filter |=
                        cpu_to_le32(IWL_WOWLAN_WAKEUP_REMOTE_LINK_LOSS |
                                    IWL_WOWLAN_WAKEUP_REMOTE_SIGNATURE_TABLE |
                                    IWL_WOWLAN_WAKEUP_REMOTE_WAKEUP_PACKET |
                                    IWL_WOWLAN_WAKEUP_LINK_CHANGE);
        }

        return 0;
}

static void
iwl_mvm_iter_d0i3_ap_keys(struct iwl_mvm *mvm,
                          struct ieee80211_vif *vif,
                          void (*iter)(struct ieee80211_hw *hw,
                                       struct ieee80211_vif *vif,
                                       struct ieee80211_sta *sta,
                                       struct ieee80211_key_conf *key,
                                       void *data),
                          void *data)
{
        struct ieee80211_sta *ap_sta;

        rcu_read_lock();

        ap_sta = rcu_dereference(mvm->fw_id_to_mac_id[mvm->d0i3_ap_sta_id]);
        if (IS_ERR_OR_NULL(ap_sta))
                goto out;

        ieee80211_iter_keys_rcu(mvm->hw, vif, iter, data);
out:
        rcu_read_unlock();
}

int iwl_mvm_wowlan_config_key_params(struct iwl_mvm *mvm,
                                     struct ieee80211_vif *vif,
                                     bool d0i3,
                                     u32 cmd_flags)
{
        struct iwl_wowlan_kek_kck_material_cmd kek_kck_cmd = {};
        struct iwl_wowlan_tkip_params_cmd tkip_cmd = {};
        struct wowlan_key_data key_data = {
                .configure_keys = !d0i3,
                .use_rsc_tsc = false,
                .tkip = &tkip_cmd,
                .use_tkip = false,
        };
        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
        int ret;

        key_data.rsc_tsc = kzalloc(sizeof(*key_data.rsc_tsc), GFP_KERNEL);
        if (!key_data.rsc_tsc)
                return -ENOMEM;

        /*
         * if we have to configure keys, call ieee80211_iter_keys(),
         * as we need non-atomic context in order to take the
         * required locks.
         * for the d0i3 we can't use ieee80211_iter_keys(), as
         * taking (almost) any mutex might result in deadlock.
         */
        if (!d0i3) {
                /*
                 * Note that currently we don't propagate cmd_flags
                 * to the iterator. In case of key_data.configure_keys,
                 * all the configured commands are SYNC, and
                 * iwl_mvm_wowlan_program_keys() will take care of
                 * locking/unlocking mvm->mutex.
                 */
                ieee80211_iter_keys(mvm->hw, vif,
                                    iwl_mvm_wowlan_program_keys,
                                    &key_data);
        } else {
                iwl_mvm_iter_d0i3_ap_keys(mvm, vif,
                                          iwl_mvm_wowlan_program_keys,
                                          &key_data);
        }

        if (key_data.error) {
                ret = -EIO;
                goto out;
        }

        if (key_data.use_rsc_tsc) {
                ret = iwl_mvm_send_cmd_pdu(mvm,
                                           WOWLAN_TSC_RSC_PARAM, cmd_flags,
                                           sizeof(*key_data.rsc_tsc),
                                           key_data.rsc_tsc);
                if (ret)
                        goto out;
        }

        if (key_data.use_tkip &&
            !fw_has_api(&mvm->fw->ucode_capa,
                        IWL_UCODE_TLV_API_TKIP_MIC_KEYS)) {
                ret = iwl_mvm_send_cmd_pdu(mvm,
                                           WOWLAN_TKIP_PARAM,
                                           cmd_flags, sizeof(tkip_cmd),
                                           &tkip_cmd);
                if (ret)
                        goto out;
        }

        /* configure rekey data only if offloaded rekey is supported (d3) */
        if (mvmvif->rekey_data.valid && !d0i3) {
                memset(&kek_kck_cmd, 0, sizeof(kek_kck_cmd));
                memcpy(kek_kck_cmd.kck, mvmvif->rekey_data.kck,
                       NL80211_KCK_LEN);
                kek_kck_cmd.kck_len = cpu_to_le16(NL80211_KCK_LEN);
                memcpy(kek_kck_cmd.kek, mvmvif->rekey_data.kek,
                       NL80211_KEK_LEN);
                kek_kck_cmd.kek_len = cpu_to_le16(NL80211_KEK_LEN);
                kek_kck_cmd.replay_ctr = mvmvif->rekey_data.replay_ctr;

                ret = iwl_mvm_send_cmd_pdu(mvm,
                                           WOWLAN_KEK_KCK_MATERIAL, cmd_flags,
                                           sizeof(kek_kck_cmd),
                                           &kek_kck_cmd);
                if (ret)
                        goto out;
        }
        ret = 0;
out:
        kfree(key_data.rsc_tsc);
        return ret;
}

static int
iwl_mvm_wowlan_config(struct iwl_mvm *mvm,
                      struct cfg80211_wowlan *wowlan,
                      struct iwl_wowlan_config_cmd *wowlan_config_cmd,
                      struct ieee80211_vif *vif, struct iwl_mvm_vif *mvmvif,
                      struct ieee80211_sta *ap_sta)
{
        int ret;
        bool unified_image = fw_has_capa(&mvm->fw->ucode_capa,
                                         IWL_UCODE_TLV_CAPA_CNSLDTD_D3_D0_IMG);

        if (!unified_image) {
                ret = iwl_mvm_switch_to_d3(mvm);
                if (ret)
                        return ret;

                ret = iwl_mvm_d3_reprogram(mvm, vif, ap_sta);
                if (ret)
                        return ret;
        }

        if (!iwlwifi_mod_params.sw_crypto) {
                /*
                 * This needs to be unlocked due to lock ordering
                 * constraints. Since we're in the suspend path
                 * that isn't really a problem though.
                 */
                mutex_unlock(&mvm->mutex);
                ret = iwl_mvm_wowlan_config_key_params(mvm, vif, false,
                                                       CMD_ASYNC);
                mutex_lock(&mvm->mutex);
                if (ret)
                        return ret;
        }

        ret = iwl_mvm_send_cmd_pdu(mvm, WOWLAN_CONFIGURATION, 0,
                                   sizeof(*wowlan_config_cmd),
                                   wowlan_config_cmd);
        if (ret)
                return ret;

        ret = iwl_mvm_send_patterns(mvm, wowlan);
        if (ret)
                return ret;

        ret = iwl_mvm_send_proto_offload(mvm, vif, false, true, 0);
        if (ret)
                return ret;

        ret = iwl_mvm_send_remote_wake_cfg(mvm, vif, wowlan->tcp);
        return ret;
}

static int
iwl_mvm_netdetect_config(struct iwl_mvm *mvm,
                         struct cfg80211_wowlan *wowlan,
                         struct cfg80211_sched_scan_request *nd_config,
                         struct ieee80211_vif *vif)
{
        struct iwl_wowlan_config_cmd wowlan_config_cmd = {};
        int ret;
        bool unified_image = fw_has_capa(&mvm->fw->ucode_capa,
                                         IWL_UCODE_TLV_CAPA_CNSLDTD_D3_D0_IMG);

        if (!unified_image) {
                ret = iwl_mvm_switch_to_d3(mvm);
                if (ret)
                        return ret;
        } else {
                /* In theory, we wouldn't have to stop a running sched
                 * scan in order to start another one (for
                 * net-detect).  But in practice this doesn't seem to
                 * work properly, so stop any running sched_scan now.
                 */
                ret = iwl_mvm_scan_stop(mvm, IWL_MVM_SCAN_SCHED, true);
                if (ret)
                        return ret;
        }

        /* rfkill release can be either for wowlan or netdetect */
        if (wowlan->rfkill_release)
                wowlan_config_cmd.wakeup_filter |=
                        cpu_to_le32(IWL_WOWLAN_WAKEUP_RF_KILL_DEASSERT);

        ret = iwl_mvm_send_cmd_pdu(mvm, WOWLAN_CONFIGURATION, 0,
                                   sizeof(wowlan_config_cmd),
                                   &wowlan_config_cmd);
        if (ret)
                return ret;

        ret = iwl_mvm_sched_scan_start(mvm, vif, nd_config, &mvm->nd_ies,
                                       IWL_MVM_SCAN_NETDETECT);
        if (ret)
                return ret;

        if (WARN_ON(mvm->nd_match_sets || mvm->nd_channels))
                return -EBUSY;

        /* save the sched scan matchsets... */
        if (nd_config->n_match_sets) {
                mvm->nd_match_sets = kmemdup(nd_config->match_sets,
                                             sizeof(*nd_config->match_sets) *
                                             nd_config->n_match_sets,
                                             GFP_KERNEL);
                if (mvm->nd_match_sets)
                        mvm->n_nd_match_sets = nd_config->n_match_sets;
        }

        /* ...and the sched scan channels for later reporting */
        mvm->nd_channels = kmemdup(nd_config->channels,
                                   sizeof(*nd_config->channels) *
                                   nd_config->n_channels,
                                   GFP_KERNEL);
        if (mvm->nd_channels)
                mvm->n_nd_channels = nd_config->n_channels;

        return 0;
}

static void iwl_mvm_free_nd(struct iwl_mvm *mvm)
{
        kfree(mvm->nd_match_sets);
        mvm->nd_match_sets = NULL;
        mvm->n_nd_match_sets = 0;
        kfree(mvm->nd_channels);
        mvm->nd_channels = NULL;
        mvm->n_nd_channels = 0;
}

static int __iwl_mvm_suspend(struct ieee80211_hw *hw,
                             struct cfg80211_wowlan *wowlan,
                             bool test)
{
        struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
        struct ieee80211_vif *vif = NULL;
        struct iwl_mvm_vif *mvmvif = NULL;
        struct ieee80211_sta *ap_sta = NULL;
        struct iwl_d3_manager_config d3_cfg_cmd_data = {
                /*
                 * Program the minimum sleep time to 10 seconds, as many
                 * platforms have issues processing a wakeup signal while
                 * still being in the process of suspending.
                 */
                .min_sleep_time = cpu_to_le32(10 * 1000 * 1000),
        };
        struct iwl_host_cmd d3_cfg_cmd = {
                .id = D3_CONFIG_CMD,
                .flags = CMD_WANT_SKB,
                .data[0] = &d3_cfg_cmd_data,
                .len[0] = sizeof(d3_cfg_cmd_data),
        };
        int ret;
        int len __maybe_unused;
        bool unified_image = fw_has_capa(&mvm->fw->ucode_capa,
                                         IWL_UCODE_TLV_CAPA_CNSLDTD_D3_D0_IMG);

        if (!wowlan) {
                /*
                 * mac80211 shouldn't get here, but for D3 test
                 * it doesn't warrant a warning
                 */
                WARN_ON(!test);
                return -EINVAL;
        }

        mutex_lock(&mvm->mutex);

        vif = iwl_mvm_get_bss_vif(mvm);
        if (IS_ERR_OR_NULL(vif)) {
                ret = 1;
                goto out_noreset;
        }

        mvmvif = iwl_mvm_vif_from_mac80211(vif);

        if (mvmvif->ap_sta_id == IWL_MVM_INVALID_STA) {
                /* if we're not associated, this must be netdetect */
                if (!wowlan->nd_config) {
                        ret = 1;
                        goto out_noreset;
                }

                ret = iwl_mvm_netdetect_config(
                        mvm, wowlan, wowlan->nd_config, vif);
                if (ret)
                        goto out;

                mvm->net_detect = true;
        } else {
                struct iwl_wowlan_config_cmd wowlan_config_cmd = {};

                ap_sta = rcu_dereference_protected(
                        mvm->fw_id_to_mac_id[mvmvif->ap_sta_id],
                        lockdep_is_held(&mvm->mutex));
                if (IS_ERR_OR_NULL(ap_sta)) {
                        ret = -EINVAL;
                        goto out_noreset;
                }

                ret = iwl_mvm_get_wowlan_config(mvm, wowlan, &wowlan_config_cmd,
                                                vif, mvmvif, ap_sta);
                if (ret)
                        goto out_noreset;
                ret = iwl_mvm_wowlan_config(mvm, wowlan, &wowlan_config_cmd,
                                            vif, mvmvif, ap_sta);
                if (ret)
                        goto out;

                mvm->net_detect = false;
        }

        ret = iwl_mvm_power_update_device(mvm);
        if (ret)
                goto out;

        ret = iwl_mvm_power_update_mac(mvm);
        if (ret)
                goto out;

#ifdef CONFIG_IWLWIFI_DEBUGFS
        if (mvm->d3_wake_sysassert)
                d3_cfg_cmd_data.wakeup_flags |=
                        cpu_to_le32(IWL_WAKEUP_D3_CONFIG_FW_ERROR);
#endif

        /* must be last -- this switches firmware state */
        ret = iwl_mvm_send_cmd(mvm, &d3_cfg_cmd);
        if (ret)
                goto out;
#ifdef CONFIG_IWLWIFI_DEBUGFS
        len = iwl_rx_packet_payload_len(d3_cfg_cmd.resp_pkt);
        if (len >= sizeof(u32)) {
                mvm->d3_test_pme_ptr =
                        le32_to_cpup((__le32 *)d3_cfg_cmd.resp_pkt->data);
        }
#endif
        iwl_free_resp(&d3_cfg_cmd);

        clear_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status);

        iwl_trans_d3_suspend(mvm->trans, test, !unified_image);
 out:
        if (ret < 0) {
                iwl_mvm_free_nd(mvm);

                if (!unified_image) {
                        iwl_mvm_ref(mvm, IWL_MVM_REF_UCODE_DOWN);
                        if (mvm->restart_fw > 0) {
                                mvm->restart_fw--;
                                ieee80211_restart_hw(mvm->hw);
                        }
                }
        }
 out_noreset:
        mutex_unlock(&mvm->mutex);

        return ret;
}

static int iwl_mvm_enter_d0i3_sync(struct iwl_mvm *mvm)
{
        struct iwl_notification_wait wait_d3;
        static const u16 d3_notif[] = { D3_CONFIG_CMD };
        int ret;

        iwl_init_notification_wait(&mvm->notif_wait, &wait_d3,
                                   d3_notif, ARRAY_SIZE(d3_notif),
                                   NULL, NULL);

        ret = iwl_mvm_enter_d0i3(mvm->hw->priv);
        if (ret)
                goto remove_notif;

        ret = iwl_wait_notification(&mvm->notif_wait, &wait_d3, HZ);
        WARN_ON_ONCE(ret);
        return ret;

remove_notif:
        iwl_remove_notification(&mvm->notif_wait, &wait_d3);
        return ret;
}

int iwl_mvm_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wowlan)
{
        struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
        struct iwl_trans *trans = mvm->trans;
        int ret;

        /* make sure the d0i3 exit work is not pending */
        flush_work(&mvm->d0i3_exit_work);

        ret = iwl_trans_suspend(trans);
        if (ret)
                return ret;

        if (wowlan->any) {
                trans->system_pm_mode = IWL_PLAT_PM_MODE_D0I3;

                if (iwl_mvm_enter_d0i3_on_suspend(mvm)) {
                        ret = iwl_mvm_enter_d0i3_sync(mvm);

                        if (ret)
                                return ret;
                }

                mutex_lock(&mvm->d0i3_suspend_mutex);
                __set_bit(D0I3_DEFER_WAKEUP, &mvm->d0i3_suspend_flags);
                mutex_unlock(&mvm->d0i3_suspend_mutex);

                iwl_trans_d3_suspend(trans, false, false);

                return 0;
        }

        trans->system_pm_mode = IWL_PLAT_PM_MODE_D3;

        return __iwl_mvm_suspend(hw, wowlan, false);
}

/* converted data from the different status responses */
struct iwl_wowlan_status_data {
        u16 pattern_number;
        u16 qos_seq_ctr[8];
        u32 wakeup_reasons;
        u32 wake_packet_length;
        u32 wake_packet_bufsize;
        const u8 *wake_packet;
};

static void iwl_mvm_report_wakeup_reasons(struct iwl_mvm *mvm,
                                          struct ieee80211_vif *vif,
                                          struct iwl_wowlan_status_data *status)
{
        struct sk_buff *pkt = NULL;
        struct cfg80211_wowlan_wakeup wakeup = {
                .pattern_idx = -1,
        };
        struct cfg80211_wowlan_wakeup *wakeup_report = &wakeup;
        u32 reasons = status->wakeup_reasons;

        if (reasons == IWL_WOWLAN_WAKEUP_BY_NON_WIRELESS) {
                wakeup_report = NULL;
                goto report;
        }

        pm_wakeup_event(mvm->dev, 0);

        if (reasons & IWL_WOWLAN_WAKEUP_BY_MAGIC_PACKET)
                wakeup.magic_pkt = true;

        if (reasons & IWL_WOWLAN_WAKEUP_BY_PATTERN)
                wakeup.pattern_idx =
                        status->pattern_number;

        if (reasons & (IWL_WOWLAN_WAKEUP_BY_DISCONNECTION_ON_MISSED_BEACON |
                       IWL_WOWLAN_WAKEUP_BY_DISCONNECTION_ON_DEAUTH))
                wakeup.disconnect = true;

        if (reasons & IWL_WOWLAN_WAKEUP_BY_GTK_REKEY_FAILURE)
                wakeup.gtk_rekey_failure = true;

        if (reasons & IWL_WOWLAN_WAKEUP_BY_RFKILL_DEASSERTED)
                wakeup.rfkill_release = true;

        if (reasons & IWL_WOWLAN_WAKEUP_BY_EAPOL_REQUEST)
                wakeup.eap_identity_req = true;

        if (reasons & IWL_WOWLAN_WAKEUP_BY_FOUR_WAY_HANDSHAKE)
                wakeup.four_way_handshake = true;

        if (reasons & IWL_WOWLAN_WAKEUP_BY_REM_WAKE_LINK_LOSS)
                wakeup.tcp_connlost = true;

        if (reasons & IWL_WOWLAN_WAKEUP_BY_REM_WAKE_SIGNATURE_TABLE)
                wakeup.tcp_nomoretokens = true;

        if (reasons & IWL_WOWLAN_WAKEUP_BY_REM_WAKE_WAKEUP_PACKET)
                wakeup.tcp_match = true;

        if (status->wake_packet_bufsize) {
                int pktsize = status->wake_packet_bufsize;
                int pktlen = status->wake_packet_length;
                const u8 *pktdata = status->wake_packet;
                struct ieee80211_hdr *hdr = (void *)pktdata;
                int truncated = pktlen - pktsize;

                /* this would be a firmware bug */
                if (WARN_ON_ONCE(truncated < 0))
                        truncated = 0;

                if (ieee80211_is_data(hdr->frame_control)) {
                        int hdrlen = ieee80211_hdrlen(hdr->frame_control);
                        int ivlen = 0, icvlen = 4; /* also FCS */

                        pkt = alloc_skb(pktsize, GFP_KERNEL);
                        if (!pkt)
                                goto report;

                        memcpy(skb_put(pkt, hdrlen), pktdata, hdrlen);
                        pktdata += hdrlen;
                        pktsize -= hdrlen;

                        if (ieee80211_has_protected(hdr->frame_control)) {
                                /*
                                 * This is unlocked and using gtk_i(c)vlen,
                                 * but since everything is under RTNL still
                                 * that's not really a problem - changing
                                 * it would be difficult.
                                 */
                                if (is_multicast_ether_addr(hdr->addr1)) {
                                        ivlen = mvm->gtk_ivlen;
                                        icvlen += mvm->gtk_icvlen;
                                } else {
                                        ivlen = mvm->ptk_ivlen;
                                        icvlen += mvm->ptk_icvlen;
                                }
                        }

                        /* if truncated, FCS/ICV is (partially) gone */
                        if (truncated >= icvlen) {
                                icvlen = 0;
                                truncated -= icvlen;
                        } else {
                                icvlen -= truncated;
                                truncated = 0;
                        }

                        pktsize -= ivlen + icvlen;
                        pktdata += ivlen;

                        memcpy(skb_put(pkt, pktsize), pktdata, pktsize);

                        if (ieee80211_data_to_8023(pkt, vif->addr, vif->type))
                                goto report;
                        wakeup.packet = pkt->data;
                        wakeup.packet_present_len = pkt->len;
                        wakeup.packet_len = pkt->len - truncated;
                        wakeup.packet_80211 = false;
                } else {
                        int fcslen = 4;

                        if (truncated >= 4) {
                                truncated -= 4;
                                fcslen = 0;
                        } else {
                                fcslen -= truncated;
                                truncated = 0;
                        }
                        pktsize -= fcslen;
                        wakeup.packet = status->wake_packet;
                        wakeup.packet_present_len = pktsize;
                        wakeup.packet_len = pktlen - truncated;
                        wakeup.packet_80211 = true;
                }
        }

 report:
        ieee80211_report_wowlan_wakeup(vif, wakeup_report, GFP_KERNEL);
        kfree_skb(pkt);
}

static void iwl_mvm_aes_sc_to_seq(struct aes_sc *sc,
                                  struct ieee80211_key_seq *seq)
{
        u64 pn;

        pn = le64_to_cpu(sc->pn);
        seq->ccmp.pn[0] = pn >> 40;
        seq->ccmp.pn[1] = pn >> 32;
        seq->ccmp.pn[2] = pn >> 24;
        seq->ccmp.pn[3] = pn >> 16;
        seq->ccmp.pn[4] = pn >> 8;
        seq->ccmp.pn[5] = pn;
}

static void iwl_mvm_tkip_sc_to_seq(struct tkip_sc *sc,
                                   struct ieee80211_key_seq *seq)
{
        seq->tkip.iv32 = le32_to_cpu(sc->iv32);
        seq->tkip.iv16 = le16_to_cpu(sc->iv16);
}

static void iwl_mvm_set_aes_rx_seq(struct iwl_mvm *mvm, struct aes_sc *scs,
                                   struct ieee80211_sta *sta,
                                   struct ieee80211_key_conf *key)
{
        int tid;

        BUILD_BUG_ON(IWL_NUM_RSC != IEEE80211_NUM_TIDS);

        if (sta && iwl_mvm_has_new_rx_api(mvm)) {
                struct iwl_mvm_sta *mvmsta;
                struct iwl_mvm_key_pn *ptk_pn;

                mvmsta = iwl_mvm_sta_from_mac80211(sta);

                ptk_pn = rcu_dereference_protected(mvmsta->ptk_pn[key->keyidx],
                                                   lockdep_is_held(&mvm->mutex));
                if (WARN_ON(!ptk_pn))
                        return;

                for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++) {
                        struct ieee80211_key_seq seq = {};
                        int i;

                        iwl_mvm_aes_sc_to_seq(&scs[tid], &seq);
                        ieee80211_set_key_rx_seq(key, tid, &seq);
                        for (i = 1; i < mvm->trans->num_rx_queues; i++)
                                memcpy(ptk_pn->q[i].pn[tid],
                                       seq.ccmp.pn, IEEE80211_CCMP_PN_LEN);
                }
        } else {
                for (tid = 0; tid < IWL_NUM_RSC; tid++) {
                        struct ieee80211_key_seq seq = {};

                        iwl_mvm_aes_sc_to_seq(&scs[tid], &seq);
                        ieee80211_set_key_rx_seq(key, tid, &seq);
                }
        }
}

static void iwl_mvm_set_tkip_rx_seq(struct tkip_sc *scs,
                                    struct ieee80211_key_conf *key)
{
        int tid;

        BUILD_BUG_ON(IWL_NUM_RSC != IEEE80211_NUM_TIDS);

        for (tid = 0; tid < IWL_NUM_RSC; tid++) {
                struct ieee80211_key_seq seq = {};

                iwl_mvm_tkip_sc_to_seq(&scs[tid], &seq);
                ieee80211_set_key_rx_seq(key, tid, &seq);
        }
}

static void iwl_mvm_set_key_rx_seq(struct iwl_mvm *mvm,
                                   struct ieee80211_key_conf *key,
                                   struct iwl_wowlan_status *status)
{
        union iwl_all_tsc_rsc *rsc = &status->gtk.rsc.all_tsc_rsc;

        switch (key->cipher) {
        case WLAN_CIPHER_SUITE_CCMP:
                iwl_mvm_set_aes_rx_seq(mvm, rsc->aes.multicast_rsc, NULL, key);
                break;
        case WLAN_CIPHER_SUITE_TKIP:
                iwl_mvm_set_tkip_rx_seq(rsc->tkip.multicast_rsc, key);
                break;
        default:
                WARN_ON(1);
        }
}

struct iwl_mvm_d3_gtk_iter_data {
        struct iwl_mvm *mvm;
        struct iwl_wowlan_status *status;
        void *last_gtk;
        u32 cipher;
        bool find_phase, unhandled_cipher;
        int num_keys;
};

static void iwl_mvm_d3_update_keys(struct ieee80211_hw *hw,
                                   struct ieee80211_vif *vif,
                                   struct ieee80211_sta *sta,
                                   struct ieee80211_key_conf *key,
                                   void *_data)
{
        struct iwl_mvm_d3_gtk_iter_data *data = _data;

        if (data->unhandled_cipher)
                return;

        switch (key->cipher) {
        case WLAN_CIPHER_SUITE_WEP40:
        case WLAN_CIPHER_SUITE_WEP104:
                /* ignore WEP completely, nothing to do */
                return;
        case WLAN_CIPHER_SUITE_CCMP:
        case WLAN_CIPHER_SUITE_TKIP:
                /* we support these */
                break;
        default:
                /* everything else (even CMAC for MFP) - disconnect from AP */
                data->unhandled_cipher = true;
                return;
        }

        data->num_keys++;

        /*
         * pairwise key - update sequence counters only;
         * note that this assumes no TDLS sessions are active
         */
        if (sta) {
                struct ieee80211_key_seq seq = {};
                union iwl_all_tsc_rsc *sc = &data->status->gtk.rsc.all_tsc_rsc;

                if (data->find_phase)
                        return;

                switch (key->cipher) {
                case WLAN_CIPHER_SUITE_CCMP:
                        iwl_mvm_set_aes_rx_seq(data->mvm, sc->aes.unicast_rsc,
                                               sta, key);
                        atomic64_set(&key->tx_pn, le64_to_cpu(sc->aes.tsc.pn));
                        break;
                case WLAN_CIPHER_SUITE_TKIP:
                        iwl_mvm_tkip_sc_to_seq(&sc->tkip.tsc, &seq);
                        iwl_mvm_set_tkip_rx_seq(sc->tkip.unicast_rsc, key);
                        atomic64_set(&key->tx_pn,
                                     (u64)seq.tkip.iv16 |
                                     ((u64)seq.tkip.iv32 << 16));
                        break;
                }

                /* that's it for this key */
                return;
        }

        if (data->find_phase) {
                data->last_gtk = key;
                data->cipher = key->cipher;
                return;
        }

        if (data->status->num_of_gtk_rekeys)
                ieee80211_remove_key(key);
        else if (data->last_gtk == key)
                iwl_mvm_set_key_rx_seq(data->mvm, key, data->status);
}

static bool iwl_mvm_setup_connection_keep(struct iwl_mvm *mvm,
                                          struct ieee80211_vif *vif,
                                          struct iwl_wowlan_status *status)
{
        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
        struct iwl_mvm_d3_gtk_iter_data gtkdata = {
                .mvm = mvm,
                .status = status,
        };
        u32 disconnection_reasons =
                IWL_WOWLAN_WAKEUP_BY_DISCONNECTION_ON_MISSED_BEACON |
                IWL_WOWLAN_WAKEUP_BY_DISCONNECTION_ON_DEAUTH;

        if (!status || !vif->bss_conf.bssid)
                return false;

        if (le32_to_cpu(status->wakeup_reasons) & disconnection_reasons)
                return false;

        /* find last GTK that we used initially, if any */
        gtkdata.find_phase = true;
        ieee80211_iter_keys(mvm->hw, vif,
                            iwl_mvm_d3_update_keys, &gtkdata);
        /* not trying to keep connections with MFP/unhandled ciphers */
        if (gtkdata.unhandled_cipher)
                return false;
        if (!gtkdata.num_keys)
                goto out;
        if (!gtkdata.last_gtk)
                return false;

        /*
         * invalidate all other GTKs that might still exist and update
         * the one that we used
         */
        gtkdata.find_phase = false;
        ieee80211_iter_keys(mvm->hw, vif,
                            iwl_mvm_d3_update_keys, &gtkdata);

        if (status->num_of_gtk_rekeys) {
                struct ieee80211_key_conf *key;
                struct {
                        struct ieee80211_key_conf conf;
                        u8 key[32];
                } conf = {
                        .conf.cipher = gtkdata.cipher,
                        .conf.keyidx = status->gtk.key_index,
                };

                switch (gtkdata.cipher) {
                case WLAN_CIPHER_SUITE_CCMP:
                        conf.conf.keylen = WLAN_KEY_LEN_CCMP;
                        memcpy(conf.conf.key, status->gtk.decrypt_key,
                               WLAN_KEY_LEN_CCMP);
                        break;
                case WLAN_CIPHER_SUITE_TKIP:
                        conf.conf.keylen = WLAN_KEY_LEN_TKIP;
                        memcpy(conf.conf.key, status->gtk.decrypt_key, 16);
                        /* leave TX MIC key zeroed, we don't use it anyway */
                        memcpy(conf.conf.key +
                               NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY,
                               status->gtk.tkip_mic_key, 8);
                        break;
                }

                key = ieee80211_gtk_rekey_add(vif, &conf.conf);
                if (IS_ERR(key))
                        return false;
                iwl_mvm_set_key_rx_seq(mvm, key, status);
        }

        if (status->num_of_gtk_rekeys) {
                __be64 replay_ctr =
                        cpu_to_be64(le64_to_cpu(status->replay_ctr));
                ieee80211_gtk_rekey_notify(vif, vif->bss_conf.bssid,
                                           (void *)&replay_ctr, GFP_KERNEL);
        }

out:
        mvmvif->seqno_valid = true;
        /* +0x10 because the set API expects next-to-use, not last-used */
        mvmvif->seqno = le16_to_cpu(status->non_qos_seq_ctr) + 0x10;

        return true;
}

static struct iwl_wowlan_status *
iwl_mvm_get_wakeup_status(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
{
        u32 base = mvm->error_event_table[0];
        struct error_table_start {
                /* cf. struct iwl_error_event_table */
                u32 valid;
                u32 error_id;
        } err_info;
        struct iwl_host_cmd cmd = {
                .id = WOWLAN_GET_STATUSES,
                .flags = CMD_WANT_SKB,
        };
        struct iwl_wowlan_status *status, *fw_status;
        int ret, len, status_size;

        iwl_trans_read_mem_bytes(mvm->trans, base,
                                 &err_info, sizeof(err_info));

        if (err_info.valid) {
                IWL_INFO(mvm, "error table is valid (%d) with error (%d)\n",
                         err_info.valid, err_info.error_id);
                if (err_info.error_id == RF_KILL_INDICATOR_FOR_WOWLAN) {
                        struct cfg80211_wowlan_wakeup wakeup = {
                                .rfkill_release = true,
                        };
                        ieee80211_report_wowlan_wakeup(vif, &wakeup,
                                                       GFP_KERNEL);
                }
                return ERR_PTR(-EIO);
        }

        /* only for tracing for now */
        ret = iwl_mvm_send_cmd_pdu(mvm, OFFLOADS_QUERY_CMD, 0, 0, NULL);
        if (ret)
                IWL_ERR(mvm, "failed to query offload statistics (%d)\n", ret);

        ret = iwl_mvm_send_cmd(mvm, &cmd);
        if (ret) {
                IWL_ERR(mvm, "failed to query status (%d)\n", ret);
                return ERR_PTR(ret);
        }

        /* RF-kill already asserted again... */
        if (!cmd.resp_pkt) {
                fw_status = ERR_PTR(-ERFKILL);
                goto out_free_resp;
        }

        status_size = sizeof(*fw_status);

        len = iwl_rx_packet_payload_len(cmd.resp_pkt);
        if (len < status_size) {
                IWL_ERR(mvm, "Invalid WoWLAN status response!\n");
                fw_status = ERR_PTR(-EIO);
                goto out_free_resp;
        }

        status = (void *)cmd.resp_pkt->data;
        if (len != (status_size +
                    ALIGN(le32_to_cpu(status->wake_packet_bufsize), 4))) {
                IWL_ERR(mvm, "Invalid WoWLAN status response!\n");
                fw_status = ERR_PTR(-EIO);
                goto out_free_resp;
        }

        fw_status = kmemdup(status, len, GFP_KERNEL);

out_free_resp:
        iwl_free_resp(&cmd);
        return fw_status;
}

/* releases the MVM mutex */
static bool iwl_mvm_query_wakeup_reasons(struct iwl_mvm *mvm,
                                         struct ieee80211_vif *vif)
{
        struct iwl_wowlan_status_data status;
        struct iwl_wowlan_status *fw_status;
        int i;
        bool keep;
        struct iwl_mvm_sta *mvm_ap_sta;

        fw_status = iwl_mvm_get_wakeup_status(mvm, vif);
        if (IS_ERR_OR_NULL(fw_status))
                goto out_unlock;

        status.pattern_number = le16_to_cpu(fw_status->pattern_number);
        for (i = 0; i < 8; i++)
                status.qos_seq_ctr[i] =
                        le16_to_cpu(fw_status->qos_seq_ctr[i]);
        status.wakeup_reasons = le32_to_cpu(fw_status->wakeup_reasons);
        status.wake_packet_length =
                le32_to_cpu(fw_status->wake_packet_length);
        status.wake_packet_bufsize =
                le32_to_cpu(fw_status->wake_packet_bufsize);
        status.wake_packet = fw_status->wake_packet;

        /* still at hard-coded place 0 for D3 image */
        mvm_ap_sta = iwl_mvm_sta_from_staid_protected(mvm, 0);
        if (!mvm_ap_sta)
                goto out_free;

        for (i = 0; i < IWL_MAX_TID_COUNT; i++) {
                u16 seq = status.qos_seq_ctr[i];
                /* firmware stores last-used value, we store next value */
                seq += 0x10;
                mvm_ap_sta->tid_data[i].seq_number = seq;
        }

        /* now we have all the data we need, unlock to avoid mac80211 issues */
        mutex_unlock(&mvm->mutex);

        iwl_mvm_report_wakeup_reasons(mvm, vif, &status);

        keep = iwl_mvm_setup_connection_keep(mvm, vif, fw_status);

        kfree(fw_status);
        return keep;

out_free:
        kfree(fw_status);
out_unlock:
        mutex_unlock(&mvm->mutex);
        return false;
}

void iwl_mvm_d0i3_update_keys(struct iwl_mvm *mvm,
                              struct ieee80211_vif *vif,
                              struct iwl_wowlan_status *status)
{
        struct iwl_mvm_d3_gtk_iter_data gtkdata = {
                .mvm = mvm,
                .status = status,
        };

        /*
         * rekey handling requires taking locks that can't be taken now.
         * however, d0i3 doesn't offload rekey, so we're fine.
         */
        if (WARN_ON_ONCE(status->num_of_gtk_rekeys))
                return;

        /* find last GTK that we used initially, if any */
        gtkdata.find_phase = true;
        iwl_mvm_iter_d0i3_ap_keys(mvm, vif, iwl_mvm_d3_update_keys, &gtkdata);

        gtkdata.find_phase = false;
        iwl_mvm_iter_d0i3_ap_keys(mvm, vif, iwl_mvm_d3_update_keys, &gtkdata);
}

struct iwl_mvm_nd_query_results {
        u32 matched_profiles;
        struct iwl_scan_offload_profile_match matches[IWL_SCAN_MAX_PROFILES];
};

static int
iwl_mvm_netdetect_query_results(struct iwl_mvm *mvm,
                                struct iwl_mvm_nd_query_results *results)
{
        struct iwl_scan_offload_profiles_query *query;
        struct iwl_host_cmd cmd = {
                .id = SCAN_OFFLOAD_PROFILES_QUERY_CMD,
                .flags = CMD_WANT_SKB,
        };
        int ret, len;

        ret = iwl_mvm_send_cmd(mvm, &cmd);
        if (ret) {
                IWL_ERR(mvm, "failed to query matched profiles (%d)\n", ret);
                return ret;
        }

        /* RF-kill already asserted again... */
        if (!cmd.resp_pkt) {
                ret = -ERFKILL;
                goto out_free_resp;
        }

        len = iwl_rx_packet_payload_len(cmd.resp_pkt);
        if (len < sizeof(*query)) {
                IWL_ERR(mvm, "Invalid scan offload profiles query response!\n");
                ret = -EIO;
                goto out_free_resp;
        }

        query = (void *)cmd.resp_pkt->data;

        results->matched_profiles = le32_to_cpu(query->matched_profiles);
        memcpy(results->matches, query->matches, sizeof(results->matches));

#ifdef CONFIG_IWLWIFI_DEBUGFS
        mvm->last_netdetect_scans = le32_to_cpu(query->n_scans_done);
#endif

out_free_resp:
        iwl_free_resp(&cmd);
        return ret;
}

static void iwl_mvm_query_netdetect_reasons(struct iwl_mvm *mvm,
                                            struct ieee80211_vif *vif)
{
        struct cfg80211_wowlan_nd_info *net_detect = NULL;
        struct cfg80211_wowlan_wakeup wakeup = {
                .pattern_idx = -1,
        };
        struct cfg80211_wowlan_wakeup *wakeup_report = &wakeup;
        struct iwl_mvm_nd_query_results query;
        struct iwl_wowlan_status *fw_status;
        unsigned long matched_profiles;
        u32 reasons = 0;
        int i, j, n_matches, ret;

        fw_status = iwl_mvm_get_wakeup_status(mvm, vif);
        if (!IS_ERR_OR_NULL(fw_status)) {
                reasons = le32_to_cpu(fw_status->wakeup_reasons);
                kfree(fw_status);
        }

        if (reasons & IWL_WOWLAN_WAKEUP_BY_RFKILL_DEASSERTED)
                wakeup.rfkill_release = true;

        if (reasons != IWL_WOWLAN_WAKEUP_BY_NON_WIRELESS)
                goto out;

        ret = iwl_mvm_netdetect_query_results(mvm, &query);
        if (ret || !query.matched_profiles) {
                wakeup_report = NULL;
                goto out;
        }

        matched_profiles = query.matched_profiles;
        if (mvm->n_nd_match_sets) {
                n_matches = hweight_long(matched_profiles);
        } else {
                IWL_ERR(mvm, "no net detect match information available\n");
                n_matches = 0;
        }

        net_detect = kzalloc(sizeof(*net_detect) +
                             (n_matches * sizeof(net_detect->matches[0])),
                             GFP_KERNEL);
        if (!net_detect || !n_matches)
                goto out_report_nd;

        for_each_set_bit(i, &matched_profiles, mvm->n_nd_match_sets) {
                struct iwl_scan_offload_profile_match *fw_match;
                struct cfg80211_wowlan_nd_match *match;
                int idx, n_channels = 0;

                fw_match = &query.matches[i];

                for (j = 0; j < SCAN_OFFLOAD_MATCHING_CHANNELS_LEN; j++)
                        n_channels += hweight8(fw_match->matching_channels[j]);

                match = kzalloc(sizeof(*match) +
                                (n_channels * sizeof(*match->channels)),
                                GFP_KERNEL);
                if (!match)
                        goto out_report_nd;

                net_detect->matches[net_detect->n_matches++] = match;

                /* We inverted the order of the SSIDs in the scan
                 * request, so invert the index here.
                 */
                idx = mvm->n_nd_match_sets - i - 1;
                match->ssid.ssid_len = mvm->nd_match_sets[idx].ssid.ssid_len;
                memcpy(match->ssid.ssid, mvm->nd_match_sets[idx].ssid.ssid,
                       match->ssid.ssid_len);

                if (mvm->n_nd_channels < n_channels)
                        continue;

                for (j = 0; j < SCAN_OFFLOAD_MATCHING_CHANNELS_LEN * 8; j++)
                        if (fw_match->matching_channels[j / 8] & (BIT(j % 8)))
                                match->channels[match->n_channels++] =
                                        mvm->nd_channels[j]->center_freq;
        }

out_report_nd:
        wakeup.net_detect = net_detect;
out:
        iwl_mvm_free_nd(mvm);

        mutex_unlock(&mvm->mutex);
        ieee80211_report_wowlan_wakeup(vif, wakeup_report, GFP_KERNEL);

        if (net_detect) {
                for (i = 0; i < net_detect->n_matches; i++)
                        kfree(net_detect->matches[i]);
                kfree(net_detect);
        }
}

static void iwl_mvm_read_d3_sram(struct iwl_mvm *mvm)
{
#ifdef CONFIG_IWLWIFI_DEBUGFS
        const struct fw_img *img = &mvm->fw->img[IWL_UCODE_WOWLAN];
        u32 len = img->sec[IWL_UCODE_SECTION_DATA].len;
        u32 offs = img->sec[IWL_UCODE_SECTION_DATA].offset;

        if (!mvm->store_d3_resume_sram)
                return;

        if (!mvm->d3_resume_sram) {
                mvm->d3_resume_sram = kzalloc(len, GFP_KERNEL);
                if (!mvm->d3_resume_sram)
                        return;
        }

        iwl_trans_read_mem_bytes(mvm->trans, offs, mvm->d3_resume_sram, len);
#endif
}

static void iwl_mvm_d3_disconnect_iter(void *data, u8 *mac,
                                       struct ieee80211_vif *vif)
{
        /* skip the one we keep connection on */
        if (data == vif)
                return;

        if (vif->type == NL80211_IFTYPE_STATION)
                ieee80211_resume_disconnect(vif);
}

static int __iwl_mvm_resume(struct iwl_mvm *mvm, bool test)
{
        struct ieee80211_vif *vif = NULL;
        int ret = 1;
        enum iwl_d3_status d3_status;
        bool keep = false;
        bool unified_image = fw_has_capa(&mvm->fw->ucode_capa,
                                         IWL_UCODE_TLV_CAPA_CNSLDTD_D3_D0_IMG);

        u32 flags = CMD_ASYNC | CMD_HIGH_PRIO | CMD_SEND_IN_IDLE |
                                    CMD_WAKE_UP_TRANS;

        mutex_lock(&mvm->mutex);

        /* get the BSS vif pointer again */
        vif = iwl_mvm_get_bss_vif(mvm);
        if (IS_ERR_OR_NULL(vif))
                goto err;

        ret = iwl_trans_d3_resume(mvm->trans, &d3_status, test, !unified_image);
        if (ret)
                goto err;

        if (d3_status != IWL_D3_STATUS_ALIVE) {
                IWL_INFO(mvm, "Device was reset during suspend\n");
                goto err;
        }

        /* query SRAM first in case we want event logging */
        iwl_mvm_read_d3_sram(mvm);

        /*
         * Query the current location and source from the D3 firmware so we
         * can play it back when we re-intiailize the D0 firmware
         */
        iwl_mvm_update_changed_regdom(mvm);

        if (!unified_image)
                /*  Re-configure default SAR profile */
                iwl_mvm_sar_select_profile(mvm, 1, 1);

        if (mvm->net_detect) {
                /* If this is a non-unified image, we restart the FW,
                 * so no need to stop the netdetect scan.  If that
                 * fails, continue and try to get the wake-up reasons,
                 * but trigger a HW restart by keeping a failure code
                 * in ret.
                 */
                if (unified_image)
                        ret = iwl_mvm_scan_stop(mvm, IWL_MVM_SCAN_NETDETECT,
                                                false);

                iwl_mvm_query_netdetect_reasons(mvm, vif);
                /* has unlocked the mutex, so skip that */
                goto out;
        } else {
                keep = iwl_mvm_query_wakeup_reasons(mvm, vif);
#ifdef CONFIG_IWLWIFI_DEBUGFS
                if (keep)
                        mvm->keep_vif = vif;
#endif
                /* has unlocked the mutex, so skip that */
                goto out_iterate;
        }

err:
        iwl_mvm_free_nd(mvm);
        mutex_unlock(&mvm->mutex);

out_iterate:
        if (!test)
                ieee80211_iterate_active_interfaces_rtnl(mvm->hw,
                        IEEE80211_IFACE_ITER_NORMAL,
                        iwl_mvm_d3_disconnect_iter, keep ? vif : NULL);

out:
        if (unified_image && !ret) {
                ret = iwl_mvm_send_cmd_pdu(mvm, D0I3_END_CMD, flags, 0, NULL);
                if (!ret) /* D3 ended successfully - no need to reset device */
                        return 0;
        }

        /*
         * Reconfigure the device in one of the following cases:
         * 1. We are not using a unified image
         * 2. We are using a unified image but had an error while exiting D3
         */
        set_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status);
        set_bit(IWL_MVM_STATUS_D3_RECONFIG, &mvm->status);
        /*
         * When switching images we return 1, which causes mac80211
         * to do a reconfig with IEEE80211_RECONFIG_TYPE_RESTART.
         * This type of reconfig calls iwl_mvm_restart_complete(),
         * where we unref the IWL_MVM_REF_UCODE_DOWN, so we need
         * to take the reference here.
         */
        iwl_mvm_ref(mvm, IWL_MVM_REF_UCODE_DOWN);

        return 1;
}

static int iwl_mvm_resume_d3(struct iwl_mvm *mvm)
{
        iwl_trans_resume(mvm->trans);

        return __iwl_mvm_resume(mvm, false);
}

static int iwl_mvm_resume_d0i3(struct iwl_mvm *mvm)
{
        bool exit_now;
        enum iwl_d3_status d3_status;
        struct iwl_trans *trans = mvm->trans;

        iwl_trans_d3_resume(trans, &d3_status, false, false);

        /*
         * make sure to clear D0I3_DEFER_WAKEUP before
         * calling iwl_trans_resume(), which might wait
         * for d0i3 exit completion.
         */
        mutex_lock(&mvm->d0i3_suspend_mutex);
        __clear_bit(D0I3_DEFER_WAKEUP, &mvm->d0i3_suspend_flags);
        exit_now = __test_and_clear_bit(D0I3_PENDING_WAKEUP,
                                        &mvm->d0i3_suspend_flags);
        mutex_unlock(&mvm->d0i3_suspend_mutex);
        if (exit_now) {
                IWL_DEBUG_RPM(mvm, "Run deferred d0i3 exit\n");
                _iwl_mvm_exit_d0i3(mvm);
        }

        iwl_trans_resume(trans);

        if (iwl_mvm_enter_d0i3_on_suspend(mvm)) {
                int ret = iwl_mvm_exit_d0i3(mvm->hw->priv);

                if (ret)
                        return ret;
                /*
                 * d0i3 exit will be deferred until reconfig_complete.
                 * make sure there we are out of d0i3.
                 */
        }
        return 0;
}

int iwl_mvm_resume(struct ieee80211_hw *hw)
{
        struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
        int ret;

        if (mvm->trans->system_pm_mode == IWL_PLAT_PM_MODE_D0I3)
                ret = iwl_mvm_resume_d0i3(mvm);
        else
                ret = iwl_mvm_resume_d3(mvm);

        mvm->trans->system_pm_mode = IWL_PLAT_PM_MODE_DISABLED;

        return ret;
}

void iwl_mvm_set_wakeup(struct ieee80211_hw *hw, bool enabled)
{
        struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);

        device_set_wakeup_enable(mvm->trans->dev, enabled);
}

#ifdef CONFIG_IWLWIFI_DEBUGFS
static int iwl_mvm_d3_test_open(struct inode *inode, struct file *file)
{
        struct iwl_mvm *mvm = inode->i_private;
        int err;

        if (mvm->d3_test_active)
                return -EBUSY;

        file->private_data = inode->i_private;

        ieee80211_stop_queues(mvm->hw);
        synchronize_net();

        mvm->trans->system_pm_mode = IWL_PLAT_PM_MODE_D3;

        /* start pseudo D3 */
        rtnl_lock();
        err = __iwl_mvm_suspend(mvm->hw, mvm->hw->wiphy->wowlan_config, true);
        rtnl_unlock();
        if (err > 0)
                err = -EINVAL;
        if (err) {
                ieee80211_wake_queues(mvm->hw);
                return err;
        }
        mvm->d3_test_active = true;
        mvm->keep_vif = NULL;
        return 0;
}

static ssize_t iwl_mvm_d3_test_read(struct file *file, char __user *user_buf,
                                    size_t count, loff_t *ppos)
{
        struct iwl_mvm *mvm = file->private_data;
        u32 pme_asserted;

        while (true) {
                /* read pme_ptr if available */
                if (mvm->d3_test_pme_ptr) {
                        pme_asserted = iwl_trans_read_mem32(mvm->trans,
                                                mvm->d3_test_pme_ptr);
                        if (pme_asserted)
                                break;
                }

                if (msleep_interruptible(100))
                        break;
        }

        return 0;
}

static void iwl_mvm_d3_test_disconn_work_iter(void *_data, u8 *mac,
                                              struct ieee80211_vif *vif)
{
        /* skip the one we keep connection on */
        if (_data == vif)
                return;

        if (vif->type == NL80211_IFTYPE_STATION)
                ieee80211_connection_loss(vif);
}

static int iwl_mvm_d3_test_release(struct inode *inode, struct file *file)
{
        struct iwl_mvm *mvm = inode->i_private;
        bool unified_image = fw_has_capa(&mvm->fw->ucode_capa,
                                         IWL_UCODE_TLV_CAPA_CNSLDTD_D3_D0_IMG);

        mvm->d3_test_active = false;

        rtnl_lock();
        __iwl_mvm_resume(mvm, true);
        rtnl_unlock();

        mvm->trans->system_pm_mode = IWL_PLAT_PM_MODE_DISABLED;

        iwl_abort_notification_waits(&mvm->notif_wait);
        if (!unified_image) {
                int remaining_time = 10;

                ieee80211_restart_hw(mvm->hw);

                /* wait for restart and disconnect all interfaces */
                while (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status) &&
                       remaining_time > 0) {
                        remaining_time--;
                        msleep(1000);
                }

                if (remaining_time == 0)
                        IWL_ERR(mvm, "Timed out waiting for HW restart!\n");
        }

        ieee80211_iterate_active_interfaces_atomic(
                mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
                iwl_mvm_d3_test_disconn_work_iter, mvm->keep_vif);

        ieee80211_wake_queues(mvm->hw);

        return 0;
}

const struct file_operations iwl_dbgfs_d3_test_ops = {
        .llseek = no_llseek,
        .open = iwl_mvm_d3_test_open,
        .read = iwl_mvm_d3_test_read,
        .release = iwl_mvm_d3_test_release,
};
#endif