/******************************************************************************
 *
 * 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 - 2013 Intel Corporation. All rights reserved.
 *
 * 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 <ilw@linux.intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 * BSD LICENSE
 *
 * Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
 * 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 "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;

        read_lock_bh(&idev->lock);
        list_for_each_entry(ifa, &idev->addr_list, if_list) {
                mvmvif->target_ipv6_addrs[idx] = ifa->addr;
                idx++;
                if (idx >= IWL_PROTO_OFFLOAD_NUM_IPV6_ADDRS)
                        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]);
}

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;
        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;

        mutex_lock(&mvm->mutex);

        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;
                }

                ret = iwl_mvm_send_cmd_pdu(mvm, WEP_KEY, CMD_SYNC,
                                           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;

                /* don't upload key again */
                goto out_unlock;
        }
        default:
                data->error = true;
                goto out_unlock;
        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.
                 */
                goto out_unlock;
        case WLAN_CIPHER_SUITE_TKIP:
                if (sta) {
                        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;

                        ieee80211_get_key_tx_seq(key, &seq);
                        tkip_tx_sc->iv16 = cpu_to_le16(seq.tkip.iv16);
                        tkip_tx_sc->iv32 = cpu_to_le32(seq.tkip.iv32);

                        ieee80211_get_tkip_p1k_iv(key, seq.tkip.iv32, 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) {
                        u8 *pn = seq.ccmp.pn;

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

                        ieee80211_get_key_tx_seq(key, &seq);
                        aes_tx_sc->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 {
                        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 use TID 0 for checking the IV in the frames.
                 */
                for (i = 0; i < IWL_NUM_RSC; i++) {
                        u8 *pn = seq.ccmp.pn;

                        ieee80211_get_key_rx_seq(key, i, &seq);
                        aes_sc->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;
        }

        /*
         * 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) {
                key->hw_key_idx = 0;
                mvm->ptk_ivlen = key->iv_len;
                mvm->ptk_icvlen = key->icv_len;
        } 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().
                 */
                key->hw_key_idx = 1;
                mvm->gtk_ivlen = key->iv_len;
                mvm->gtk_icvlen = key->icv_len;
        }

        ret = iwl_mvm_set_sta_key(mvm, vif, sta, key, true);
        data->error = ret != 0;
out_unlock:
        mutex_unlock(&mvm->mutex);
}

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,
                .flags = CMD_SYNC,
        };
        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;
}

static int iwl_mvm_send_proto_offload(struct iwl_mvm *mvm,
                                      struct ieee80211_vif *vif)
{
        struct iwl_proto_offload_cmd cmd = {};
#if IS_ENABLED(CONFIG_IPV6)
        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
        int i;

        if (mvmvif->num_target_ipv6_addrs) {
                cmd.enabled |= cpu_to_le32(IWL_D3_PROTO_OFFLOAD_NS);
                memcpy(cmd.ndp_mac_addr, vif->addr, ETH_ALEN);
        }

        BUILD_BUG_ON(sizeof(cmd.target_ipv6_addr[i]) !=
                     sizeof(mvmvif->target_ipv6_addrs[i]));

        for (i = 0; i < mvmvif->num_target_ipv6_addrs; i++)
                memcpy(cmd.target_ipv6_addr[i],
                       &mvmvif->target_ipv6_addrs[i],
                       sizeof(cmd.target_ipv6_addr[i]));
#endif

        if (vif->bss_conf.arp_addr_cnt) {
                cmd.enabled |= cpu_to_le32(IWL_D3_PROTO_OFFLOAD_ARP);
                cmd.host_ipv4_addr = vif->bss_conf.arp_addr_list[0];
                memcpy(cmd.arp_mac_addr, vif->addr, ETH_ALEN);
        }

        if (!cmd.enabled)
                return 0;

        return iwl_mvm_send_cmd_pdu(mvm, PROT_OFFLOAD_CONFIG_CMD, CMD_SYNC,
                                    sizeof(cmd), &cmd);
}

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, },
                .flags = CMD_SYNC,
        };
        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;
}

struct iwl_d3_iter_data {
        struct iwl_mvm *mvm;
        struct ieee80211_vif *vif;
        bool error;
};

static void iwl_mvm_d3_iface_iterator(void *_data, u8 *mac,
                                      struct ieee80211_vif *vif)
{
        struct iwl_d3_iter_data *data = _data;
        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);

        if (vif->type != NL80211_IFTYPE_STATION || vif->p2p)
                return;

        if (mvmvif->ap_sta_id == IWL_MVM_STATION_COUNT)
                return;

        if (data->vif) {
                IWL_ERR(data->mvm, "More than one managed interface active!\n");
                data->error = true;
                return;
        }

        data->vif = vif;
}

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;

        /* 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;
        /* hack */
        vif->bss_conf.assoc = false;
        ret = iwl_mvm_mac_ctxt_add(mvm, vif);
        vif->bss_conf.assoc = true;
        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,
                                          sizeof(binding_cmd), &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);
        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);
        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(100);
        quota_cmd.quotas[0].max_duration = cpu_to_le32(1000);

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

        return 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 iwl_d3_iter_data suspend_iter_data = {
                .mvm = mvm,
        };
        struct ieee80211_vif *vif;
        struct iwl_mvm_vif *mvmvif;
        struct ieee80211_sta *ap_sta;
        struct iwl_mvm_sta *mvm_ap_sta;
        struct iwl_wowlan_config_cmd wowlan_config_cmd = {};
        struct iwl_wowlan_kek_kck_material_cmd kek_kck_cmd = {};
        struct iwl_wowlan_tkip_params_cmd tkip_cmd = {};
        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_SYNC | CMD_WANT_SKB,
                .data[0] = &d3_cfg_cmd_data,
                .len[0] = sizeof(d3_cfg_cmd_data),
        };
        struct wowlan_key_data key_data = {
                .use_rsc_tsc = false,
                .tkip = &tkip_cmd,
                .use_tkip = false,
        };
        int ret, i;
        int len __maybe_unused;
        u16 seq;
        u8 old_aux_sta_id, old_ap_sta_id = IWL_MVM_STATION_COUNT;

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

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

        mutex_lock(&mvm->mutex);

        old_aux_sta_id = mvm->aux_sta.sta_id;

        /* see if there's only a single BSS vif and it's associated */
        ieee80211_iterate_active_interfaces_atomic(
                mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
                iwl_mvm_d3_iface_iterator, &suspend_iter_data);

        if (suspend_iter_data.error || !suspend_iter_data.vif) {
                ret = 1;
                goto out_noreset;
        }

        vif = suspend_iter_data.vif;
        mvmvif = iwl_mvm_vif_from_mac80211(vif);

        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;
        }

        mvm_ap_sta = (struct iwl_mvm_sta *)ap_sta->drv_priv;

        /*
         * The D3 firmware still hardcodes the AP station ID for the
         * BSS we're associated with as 0. Store the real STA ID here
         * and assign 0. When we leave this function, we'll restore
         * the original value for the resume code.
         */
        old_ap_sta_id = mvm_ap_sta->sta_id;
        mvm_ap_sta->sta_id = 0;
        mvmvif->ap_sta_id = 0;

        /* TODO: wowlan_config_cmd.wowlan_ba_teardown_tids */

        wowlan_config_cmd.is_11n_connection = ap_sta->ht_cap.ht_supported;

        /*
         * We know the last used seqno, and the uCode expects to know that
         * one, it will increment before TX.
         */
        seq = mvm_ap_sta->last_seq_ctl & IEEE80211_SCTL_SEQ;
        wowlan_config_cmd.non_qos_seq = cpu_to_le16(seq);

        /*
         * For QoS counters, we store the one to use next, so subtract 0x10
         * since the uCode will add 0x10 *before* using the value while we
         * increment after using the value (i.e. store the next value to use).
         */
        for (i = 0; i < IWL_MAX_TID_COUNT; i++) {
                seq = mvm_ap_sta->tid_data[i].seq_number;
                seq -= 0x10;
                wowlan_config_cmd.qos_seq[i] = cpu_to_le16(seq);
        }

        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);
        }

        iwl_mvm_cancel_scan(mvm);

        iwl_trans_stop_device(mvm->trans);

        /*
         * 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);

        /* We reprogram keys and shouldn't allocate new key indices */
        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;

        /*
         * The D3 firmware still hardcodes the AP station ID for the
         * BSS we're associated with as 0. As a result, we have to move
         * the auxiliary station to ID 1 so the ID 0 remains free for
         * the AP station for later.
         * We set the sta_id to 1 here, and reset it to its previous
         * value (that we stored above) later.
         */
        mvm->aux_sta.sta_id = 1;

        ret = iwl_mvm_load_d3_fw(mvm);
        if (ret)
                goto out;

        ret = iwl_mvm_d3_reprogram(mvm, vif, ap_sta);
        if (ret)
                goto out;

        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);
                ieee80211_iter_keys(mvm->hw, vif,
                                    iwl_mvm_wowlan_program_keys,
                                    &key_data);
                mutex_lock(&mvm->mutex);
                if (key_data.error) {
                        ret = -EIO;
                        goto out;
                }

                if (key_data.use_rsc_tsc) {
                        struct iwl_host_cmd rsc_tsc_cmd = {
                                .id = WOWLAN_TSC_RSC_PARAM,
                                .flags = CMD_SYNC,
                                .data[0] = key_data.rsc_tsc,
                                .dataflags[0] = IWL_HCMD_DFL_NOCOPY,
                                .len[0] = sizeof(*key_data.rsc_tsc),
                        };

                        ret = iwl_mvm_send_cmd(mvm, &rsc_tsc_cmd);
                        if (ret)
                                goto out;
                }

                if (key_data.use_tkip) {
                        ret = iwl_mvm_send_cmd_pdu(mvm,
                                                   WOWLAN_TKIP_PARAM,
                                                   CMD_SYNC, sizeof(tkip_cmd),
                                                   &tkip_cmd);
                        if (ret)
                                goto out;
                }

                if (mvmvif->rekey_data.valid) {
                        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_SYNC,
                                                   sizeof(kek_kck_cmd),
                                                   &kek_kck_cmd);
                        if (ret)
                                goto out;
                }
        }

        ret = iwl_mvm_send_cmd_pdu(mvm, WOWLAN_CONFIGURATION,
                                   CMD_SYNC, sizeof(wowlan_config_cmd),
                                   &wowlan_config_cmd);
        if (ret)
                goto out;

        ret = iwl_mvm_send_patterns(mvm, wowlan);
        if (ret)
                goto out;

        ret = iwl_mvm_send_proto_offload(mvm, vif);
        if (ret)
                goto out;

        ret = iwl_mvm_send_remote_wake_cfg(mvm, vif, wowlan->tcp);
        if (ret)
                goto out;

        ret = iwl_mvm_power_update_mode(mvm, vif);
        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 = le32_to_cpu(d3_cfg_cmd.resp_pkt->len_n_flags) &
                FH_RSCSR_FRAME_SIZE_MSK;
        if (len >= sizeof(u32) * 2) {
                mvm->d3_test_pme_ptr =
                        le32_to_cpup((__le32 *)d3_cfg_cmd.resp_pkt->data);
        } else if (test) {
                /* in test mode we require the pointer */
                ret = -EIO;
                goto out;
        }
#endif
        iwl_free_resp(&d3_cfg_cmd);

        clear_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status);

        iwl_trans_d3_suspend(mvm->trans, test);
 out:
        mvm->aux_sta.sta_id = old_aux_sta_id;
        mvm_ap_sta->sta_id = old_ap_sta_id;
        mvmvif->ap_sta_id = old_ap_sta_id;
 out_noreset:
        kfree(key_data.rsc_tsc);
        if (ret < 0)
                ieee80211_restart_hw(mvm->hw);

        mutex_unlock(&mvm->mutex);

        return ret;
}

int iwl_mvm_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wowlan)
{
        return __iwl_mvm_suspend(hw, wowlan, false);
}

static void iwl_mvm_query_wakeup_reasons(struct iwl_mvm *mvm,
                                         struct ieee80211_vif *vif)
{
        u32 base = mvm->error_event_table;
        struct error_table_start {
                /* cf. struct iwl_error_event_table */
                u32 valid;
                u32 error_id;
        } err_info;
        struct cfg80211_wowlan_wakeup wakeup = {
                .pattern_idx = -1,
        };
        struct cfg80211_wowlan_wakeup *wakeup_report = &wakeup;
        struct iwl_host_cmd cmd = {
                .id = WOWLAN_GET_STATUSES,
                .flags = CMD_SYNC | CMD_WANT_SKB,
        };
        struct iwl_wowlan_status *status;
        u32 reasons;
        int ret, len;
        struct sk_buff *pkt = NULL;

        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)\n",
                         err_info.valid);
                if (err_info.error_id == RF_KILL_INDICATOR_FOR_WOWLAN) {
                        wakeup.rfkill_release = true;
                        ieee80211_report_wowlan_wakeup(vif, &wakeup,
                                                       GFP_KERNEL);
                }
                return;
        }

        /* only for tracing for now */
        ret = iwl_mvm_send_cmd_pdu(mvm, OFFLOADS_QUERY_CMD, CMD_SYNC, 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;
        }

        /* RF-kill already asserted again... */
        if (!cmd.resp_pkt)
                return;

        len = le32_to_cpu(cmd.resp_pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK;
        if (len - sizeof(struct iwl_cmd_header) < sizeof(*status)) {
                IWL_ERR(mvm, "Invalid WoWLAN status response!\n");
                goto out;
        }

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

        if (len - sizeof(struct iwl_cmd_header) !=
            sizeof(*status) +
            ALIGN(le32_to_cpu(status->wake_packet_bufsize), 4)) {
                IWL_ERR(mvm, "Invalid WoWLAN status response!\n");
                goto out;
        }

        reasons = le32_to_cpu(status->wakeup_reasons);

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

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

        if (reasons & IWL_WOWLAN_WAKEUP_BY_PATTERN)
                wakeup.pattern_idx =
                        le16_to_cpu(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 = le32_to_cpu(status->wake_packet_bufsize);
                int pktlen = le32_to_cpu(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)) {
                                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);

 out:
        iwl_free_resp(&cmd);
}

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 int __iwl_mvm_resume(struct iwl_mvm *mvm, bool test)
{
        struct iwl_d3_iter_data resume_iter_data = {
                .mvm = mvm,
        };
        struct ieee80211_vif *vif = NULL;
        int ret;
        enum iwl_d3_status d3_status;

        mutex_lock(&mvm->mutex);

        /* get the BSS vif pointer again */
        ieee80211_iterate_active_interfaces_atomic(
                mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
                iwl_mvm_d3_iface_iterator, &resume_iter_data);

        if (WARN_ON(resume_iter_data.error || !resume_iter_data.vif))
                goto out_unlock;

        vif = resume_iter_data.vif;

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

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

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

        iwl_mvm_query_wakeup_reasons(mvm, vif);

 out_unlock:
        mutex_unlock(&mvm->mutex);

        if (!test && vif)
                ieee80211_resume_disconnect(vif);

        /* return 1 to reconfigure the device */
        set_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status);
        return 1;
}

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

        return __iwl_mvm_resume(mvm, false);
}

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();

        /* 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;
        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) {
                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)
{
        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;
        int remaining_time = 10;

        mvm->d3_test_active = false;
        __iwl_mvm_resume(mvm, true);
        iwl_abort_notification_waits(&mvm->notif_wait);
        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 to finish!\n");

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

        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