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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2011 Instituto Nokia de Tecnologia
  *
  * Authors:
  *    Lauro Ramos Venancio <lauro.venancio@openbossa.org>
  *    Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
  *
  * Vendor commands implementation based on net/wireless/nl80211.c
  * which is:
  *
  * Copyright 2006-2010  Johannes Berg <johannes@sipsolutions.net>
  * Copyright 2013-2014  Intel Mobile Communications GmbH
  */
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
 
 #include <net/genetlink.h>
 #include <linux/nfc.h>
 #include <linux/slab.h>
 
 #include "nfc.h"
 #include "llcp.h"
 
 static const struct genl_multicast_group nfc_genl_mcgrps[] = {
     { .name = NFC_GENL_MCAST_EVENT_NAME, },
 };
 
 static struct genl_family nfc_genl_family;
 static const struct nla_policy nfc_genl_policy[NFC_ATTR_MAX + 1] = {
     [NFC_ATTR_DEVICE_INDEX] = { .type = NLA_U32 },
     [NFC_ATTR_DEVICE_NAME] = { .type = NLA_STRING,
                 .len = NFC_DEVICE_NAME_MAXSIZE },
     [NFC_ATTR_PROTOCOLS] = { .type = NLA_U32 },
     [NFC_ATTR_TARGET_INDEX] = { .type = NLA_U32 },
     [NFC_ATTR_COMM_MODE] = { .type = NLA_U8 },
     [NFC_ATTR_RF_MODE] = { .type = NLA_U8 },
     [NFC_ATTR_DEVICE_POWERED] = { .type = NLA_U8 },
     [NFC_ATTR_IM_PROTOCOLS] = { .type = NLA_U32 },
     [NFC_ATTR_TM_PROTOCOLS] = { .type = NLA_U32 },
     [NFC_ATTR_LLC_PARAM_LTO] = { .type = NLA_U8 },
     [NFC_ATTR_LLC_PARAM_RW] = { .type = NLA_U8 },
     [NFC_ATTR_LLC_PARAM_MIUX] = { .type = NLA_U16 },
     [NFC_ATTR_LLC_SDP] = { .type = NLA_NESTED },
     [NFC_ATTR_FIRMWARE_NAME] = { .type = NLA_STRING,
                      .len = NFC_FIRMWARE_NAME_MAXSIZE },
     [NFC_ATTR_SE_INDEX] = { .type = NLA_U32 },
     [NFC_ATTR_SE_APDU] = { .type = NLA_BINARY },
     [NFC_ATTR_VENDOR_ID] = { .type = NLA_U32 },
     [NFC_ATTR_VENDOR_SUBCMD] = { .type = NLA_U32 },
     [NFC_ATTR_VENDOR_DATA] = { .type = NLA_BINARY },
 
 };
 
 static const struct nla_policy nfc_sdp_genl_policy[NFC_SDP_ATTR_MAX + 1] = {
     [NFC_SDP_ATTR_URI] = { .type = NLA_STRING,
                    .len = U8_MAX - 4 },
     [NFC_SDP_ATTR_SAP] = { .type = NLA_U8 },
 };
 
 static int nfc_genl_send_target(struct sk_buff *msg, struct nfc_target *target,
                 struct netlink_callback *cb, int flags)
 {
     void *hdr;
 
     hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
               &nfc_genl_family, flags, NFC_CMD_GET_TARGET);
     if (!hdr)
         return -EMSGSIZE;
 
     genl_dump_check_consistent(cb, hdr);
 
     if (nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target->idx) ||
         nla_put_u32(msg, NFC_ATTR_PROTOCOLS, target->supported_protocols) ||
         nla_put_u16(msg, NFC_ATTR_TARGET_SENS_RES, target->sens_res) ||
         nla_put_u8(msg, NFC_ATTR_TARGET_SEL_RES, target->sel_res))
         goto nla_put_failure;
     if (target->nfcid1_len > 0 &&
         nla_put(msg, NFC_ATTR_TARGET_NFCID1, target->nfcid1_len,
             target->nfcid1))
         goto nla_put_failure;
     if (target->sensb_res_len > 0 &&
         nla_put(msg, NFC_ATTR_TARGET_SENSB_RES, target->sensb_res_len,
             target->sensb_res))
         goto nla_put_failure;
     if (target->sensf_res_len > 0 &&
         nla_put(msg, NFC_ATTR_TARGET_SENSF_RES, target->sensf_res_len,
             target->sensf_res))
         goto nla_put_failure;
 
     if (target->is_iso15693) {
         if (nla_put_u8(msg, NFC_ATTR_TARGET_ISO15693_DSFID,
                    target->iso15693_dsfid) ||
             nla_put(msg, NFC_ATTR_TARGET_ISO15693_UID,
                 sizeof(target->iso15693_uid), target->iso15693_uid))
             goto nla_put_failure;
     }
 
     genlmsg_end(msg, hdr);
     return 0;
 
 nla_put_failure:
     genlmsg_cancel(msg, hdr);
     return -EMSGSIZE;
 }
 
 static struct nfc_dev *__get_device_from_cb(struct netlink_callback *cb)
 {
     const struct genl_dumpit_info *info = genl_dumpit_info(cb);
     struct nfc_dev *dev;
     u32 idx;
 
     if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
         return ERR_PTR(-EINVAL);
 
     idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 
     dev = nfc_get_device(idx);
     if (!dev)
         return ERR_PTR(-ENODEV);
 
     return dev;
 }
 
 static int nfc_genl_dump_targets(struct sk_buff *skb,
                  struct netlink_callback *cb)
 {
     int i = cb->args[0];
     struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
     int rc;
 
     if (!dev) {
         dev = __get_device_from_cb(cb);
         if (IS_ERR(dev))
             return PTR_ERR(dev);
 
         cb->args[1] = (long) dev;
     }
 
     device_lock(&dev->dev);
 
     cb->seq = dev->targets_generation;
 
     while (i < dev->n_targets) {
         rc = nfc_genl_send_target(skb, &dev->targets[i], cb,
                       NLM_F_MULTI);
         if (rc < 0)
             break;
 
         i++;
     }
 
     device_unlock(&dev->dev);
 
     cb->args[0] = i;
 
     return skb->len;
 }
 
 static int nfc_genl_dump_targets_done(struct netlink_callback *cb)
 {
     struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
 
     if (dev)
         nfc_put_device(dev);
 
     return 0;
 }
 
 int nfc_genl_targets_found(struct nfc_dev *dev)
 {
     struct sk_buff *msg;
     void *hdr;
 
     dev->genl_data.poll_req_portid = 0;
 
     msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
     if (!msg)
         return -ENOMEM;
 
     hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
               NFC_EVENT_TARGETS_FOUND);
     if (!hdr)
         goto free_msg;
 
     if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
         goto nla_put_failure;
 
     genlmsg_end(msg, hdr);
 
     return genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
 
 nla_put_failure:
 free_msg:
     nlmsg_free(msg);
     return -EMSGSIZE;
 }
 
 int nfc_genl_target_lost(struct nfc_dev *dev, u32 target_idx)
 {
     struct sk_buff *msg;
     void *hdr;
 
     msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
     if (!msg)
         return -ENOMEM;
 
     hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
               NFC_EVENT_TARGET_LOST);
     if (!hdr)
         goto free_msg;
 
     if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
         nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
         goto nla_put_failure;
 
     genlmsg_end(msg, hdr);
 
     genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
 
     return 0;
 
 nla_put_failure:
 free_msg:
     nlmsg_free(msg);
     return -EMSGSIZE;
 }
 
 int nfc_genl_tm_activated(struct nfc_dev *dev, u32 protocol)
 {
     struct sk_buff *msg;
     void *hdr;
 
     msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
     if (!msg)
         return -ENOMEM;
 
     hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
               NFC_EVENT_TM_ACTIVATED);
     if (!hdr)
         goto free_msg;
 
     if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
         goto nla_put_failure;
     if (nla_put_u32(msg, NFC_ATTR_TM_PROTOCOLS, protocol))
         goto nla_put_failure;
 
     genlmsg_end(msg, hdr);
 
     genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
 
     return 0;
 
 nla_put_failure:
 free_msg:
     nlmsg_free(msg);
     return -EMSGSIZE;
 }
 
 int nfc_genl_tm_deactivated(struct nfc_dev *dev)
 {
     struct sk_buff *msg;
     void *hdr;
 
     msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
     if (!msg)
         return -ENOMEM;
 
     hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
               NFC_EVENT_TM_DEACTIVATED);
     if (!hdr)
         goto free_msg;
 
     if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
         goto nla_put_failure;
 
     genlmsg_end(msg, hdr);
 
     genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
 
     return 0;
 
 nla_put_failure:
 free_msg:
     nlmsg_free(msg);
     return -EMSGSIZE;
 }
 
 static int nfc_genl_setup_device_added(struct nfc_dev *dev, struct sk_buff *msg)
 {
     if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
         nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
         nla_put_u32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols) ||
         nla_put_u8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up) ||
         nla_put_u8(msg, NFC_ATTR_RF_MODE, dev->rf_mode))
         return -1;
     return 0;
 }
 
 int nfc_genl_device_added(struct nfc_dev *dev)
 {
     struct sk_buff *msg;
     void *hdr;
 
     msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
     if (!msg)
         return -ENOMEM;
 
     hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
               NFC_EVENT_DEVICE_ADDED);
     if (!hdr)
         goto free_msg;
 
     if (nfc_genl_setup_device_added(dev, msg))
         goto nla_put_failure;
 
     genlmsg_end(msg, hdr);
 
     genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
 
     return 0;
 
 nla_put_failure:
 free_msg:
     nlmsg_free(msg);
     return -EMSGSIZE;
 }
 
 int nfc_genl_device_removed(struct nfc_dev *dev)
 {
     struct sk_buff *msg;
     void *hdr;
 
     msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
     if (!msg)
         return -ENOMEM;
 
     hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
               NFC_EVENT_DEVICE_REMOVED);
     if (!hdr)
         goto free_msg;
 
     if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
         goto nla_put_failure;
 
     genlmsg_end(msg, hdr);
 
     genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
 
     return 0;
 
 nla_put_failure:
 free_msg:
     nlmsg_free(msg);
     return -EMSGSIZE;
 }
 
 int nfc_genl_llc_send_sdres(struct nfc_dev *dev, struct hlist_head *sdres_list)
 {
     struct sk_buff *msg;
     struct nlattr *sdp_attr, *uri_attr;
     struct nfc_llcp_sdp_tlv *sdres;
     struct hlist_node *n;
     void *hdr;
     int rc = -EMSGSIZE;
     int i;
 
     msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
     if (!msg)
         return -ENOMEM;
 
     hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
               NFC_EVENT_LLC_SDRES);
     if (!hdr)
         goto free_msg;
 
     if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
         goto nla_put_failure;
 
     sdp_attr = nla_nest_start_noflag(msg, NFC_ATTR_LLC_SDP);
     if (sdp_attr == NULL) {
         rc = -ENOMEM;
         goto nla_put_failure;
     }
 
     i = 1;
     hlist_for_each_entry_safe(sdres, n, sdres_list, node) {
         pr_debug("uri: %s, sap: %d\n", sdres->uri, sdres->sap);
 
         uri_attr = nla_nest_start_noflag(msg, i++);
         if (uri_attr == NULL) {
             rc = -ENOMEM;
             goto nla_put_failure;
         }
 
         if (nla_put_u8(msg, NFC_SDP_ATTR_SAP, sdres->sap))
             goto nla_put_failure;
 
         if (nla_put_string(msg, NFC_SDP_ATTR_URI, sdres->uri))
             goto nla_put_failure;
 
         nla_nest_end(msg, uri_attr);
 
         hlist_del(&sdres->node);
 
         nfc_llcp_free_sdp_tlv(sdres);
     }
 
     nla_nest_end(msg, sdp_attr);
 
     genlmsg_end(msg, hdr);
 
     return genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
 
 nla_put_failure:
 free_msg:
     nlmsg_free(msg);
 
     nfc_llcp_free_sdp_tlv_list(sdres_list);
 
     return rc;
 }
 
 int nfc_genl_se_added(struct nfc_dev *dev, u32 se_idx, u16 type)
 {
     struct sk_buff *msg;
     void *hdr;
 
     msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
     if (!msg)
         return -ENOMEM;
 
     hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
               NFC_EVENT_SE_ADDED);
     if (!hdr)
         goto free_msg;
 
     if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
         nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx) ||
         nla_put_u8(msg, NFC_ATTR_SE_TYPE, type))
         goto nla_put_failure;
 
     genlmsg_end(msg, hdr);
 
     genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
 
     return 0;
 
 nla_put_failure:
 free_msg:
     nlmsg_free(msg);
     return -EMSGSIZE;
 }
 
 int nfc_genl_se_removed(struct nfc_dev *dev, u32 se_idx)
 {
     struct sk_buff *msg;
     void *hdr;
 
     msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
     if (!msg)
         return -ENOMEM;
 
     hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
               NFC_EVENT_SE_REMOVED);
     if (!hdr)
         goto free_msg;
 
     if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
         nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx))
         goto nla_put_failure;
 
     genlmsg_end(msg, hdr);
 
     genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
 
     return 0;
 
 nla_put_failure:
 free_msg:
     nlmsg_free(msg);
     return -EMSGSIZE;
 }
 
 int nfc_genl_se_transaction(struct nfc_dev *dev, u8 se_idx,
                 struct nfc_evt_transaction *evt_transaction)
 {
     struct nfc_se *se;
     struct sk_buff *msg;
     void *hdr;
 
     msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
     if (!msg)
         return -ENOMEM;
 
     hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
               NFC_EVENT_SE_TRANSACTION);
     if (!hdr)
         goto free_msg;
 
     se = nfc_find_se(dev, se_idx);
     if (!se)
         goto free_msg;
 
     if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
         nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx) ||
         nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type) ||
         nla_put(msg, NFC_ATTR_SE_AID, evt_transaction->aid_len,
             evt_transaction->aid) ||
         nla_put(msg, NFC_ATTR_SE_PARAMS, evt_transaction->params_len,
             evt_transaction->params))
         goto nla_put_failure;
 
     /* evt_transaction is no more used */
     devm_kfree(&dev->dev, evt_transaction);
 
     genlmsg_end(msg, hdr);
 
     genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
 
     return 0;
 
 nla_put_failure:
 free_msg:
     /* evt_transaction is no more used */
     devm_kfree(&dev->dev, evt_transaction);
     nlmsg_free(msg);
     return -EMSGSIZE;
 }
 
 int nfc_genl_se_connectivity(struct nfc_dev *dev, u8 se_idx)
 {
     const struct nfc_se *se;
     struct sk_buff *msg;
     void *hdr;
 
     msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
     if (!msg)
         return -ENOMEM;
 
     hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
               NFC_EVENT_SE_CONNECTIVITY);
     if (!hdr)
         goto free_msg;
 
     se = nfc_find_se(dev, se_idx);
     if (!se)
         goto free_msg;
 
     if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
         nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx) ||
         nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type))
         goto nla_put_failure;
 
     genlmsg_end(msg, hdr);
 
     genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
 
     return 0;
 
 nla_put_failure:
 free_msg:
     nlmsg_free(msg);
     return -EMSGSIZE;
 }
 
 static int nfc_genl_send_device(struct sk_buff *msg, struct nfc_dev *dev,
                 u32 portid, u32 seq,
                 struct netlink_callback *cb,
                 int flags)
 {
     void *hdr;
 
     hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, flags,
               NFC_CMD_GET_DEVICE);
     if (!hdr)
         return -EMSGSIZE;
 
     if (cb)
         genl_dump_check_consistent(cb, hdr);
 
     if (nfc_genl_setup_device_added(dev, msg))
         goto nla_put_failure;
 
     genlmsg_end(msg, hdr);
     return 0;
 
 nla_put_failure:
     genlmsg_cancel(msg, hdr);
     return -EMSGSIZE;
 }
 
 static int nfc_genl_dump_devices(struct sk_buff *skb,
                  struct netlink_callback *cb)
 {
     struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
     struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
     bool first_call = false;
 
     if (!iter) {
         first_call = true;
         iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
         if (!iter)
             return -ENOMEM;
         cb->args[0] = (long) iter;
     }
 
     mutex_lock(&nfc_devlist_mutex);
 
     cb->seq = nfc_devlist_generation;
 
     if (first_call) {
         nfc_device_iter_init(iter);
         dev = nfc_device_iter_next(iter);
     }
 
     while (dev) {
         int rc;
 
         rc = nfc_genl_send_device(skb, dev, NETLINK_CB(cb->skb).portid,
                       cb->nlh->nlmsg_seq, cb, NLM_F_MULTI);
         if (rc < 0)
             break;
 
         dev = nfc_device_iter_next(iter);
     }
 
     mutex_unlock(&nfc_devlist_mutex);
 
     cb->args[1] = (long) dev;
 
     return skb->len;
 }
 
 static int nfc_genl_dump_devices_done(struct netlink_callback *cb)
 {
     struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
 
     if (iter) {
         nfc_device_iter_exit(iter);
         kfree(iter);
     }
 
     return 0;
 }
 
 int nfc_genl_dep_link_up_event(struct nfc_dev *dev, u32 target_idx,
                    u8 comm_mode, u8 rf_mode)
 {
     struct sk_buff *msg;
     void *hdr;
 
     pr_debug("DEP link is up\n");
 
     msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
     if (!msg)
         return -ENOMEM;
 
     hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, NFC_CMD_DEP_LINK_UP);
     if (!hdr)
         goto free_msg;
 
     if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
         goto nla_put_failure;
     if (rf_mode == NFC_RF_INITIATOR &&
         nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
         goto nla_put_failure;
     if (nla_put_u8(msg, NFC_ATTR_COMM_MODE, comm_mode) ||
         nla_put_u8(msg, NFC_ATTR_RF_MODE, rf_mode))
         goto nla_put_failure;
 
     genlmsg_end(msg, hdr);
 
     dev->dep_link_up = true;
 
     genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
 
     return 0;
 
 nla_put_failure:
 free_msg:
     nlmsg_free(msg);
     return -EMSGSIZE;
 }
 
 int nfc_genl_dep_link_down_event(struct nfc_dev *dev)
 {
     struct sk_buff *msg;
     void *hdr;
 
     pr_debug("DEP link is down\n");
 
     msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
     if (!msg)
         return -ENOMEM;
 
     hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
               NFC_CMD_DEP_LINK_DOWN);
     if (!hdr)
         goto free_msg;
 
     if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
         goto nla_put_failure;
 
     genlmsg_end(msg, hdr);
 
     genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
 
     return 0;
 
 nla_put_failure:
 free_msg:
     nlmsg_free(msg);
     return -EMSGSIZE;
 }
 
 static int nfc_genl_get_device(struct sk_buff *skb, struct genl_info *info)
 {
     struct sk_buff *msg;
     struct nfc_dev *dev;
     u32 idx;
     int rc = -ENOBUFS;
 
     if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
         return -EINVAL;
 
     idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 
     dev = nfc_get_device(idx);
     if (!dev)
         return -ENODEV;
 
     msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
     if (!msg) {
         rc = -ENOMEM;
         goto out_putdev;
     }
 
     rc = nfc_genl_send_device(msg, dev, info->snd_portid, info->snd_seq,
                   NULL, 0);
     if (rc < 0)
         goto out_free;
 
     nfc_put_device(dev);
 
     return genlmsg_reply(msg, info);
 
 out_free:
     nlmsg_free(msg);
 out_putdev:
     nfc_put_device(dev);
     return rc;
 }
 
 static int nfc_genl_dev_up(struct sk_buff *skb, struct genl_info *info)
 {
     struct nfc_dev *dev;
     int rc;
     u32 idx;
 
     if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
         return -EINVAL;
 
     idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 
     dev = nfc_get_device(idx);
     if (!dev)
         return -ENODEV;
 
     rc = nfc_dev_up(dev);
 
     nfc_put_device(dev);
     return rc;
 }
 
 static int nfc_genl_dev_down(struct sk_buff *skb, struct genl_info *info)
 {
     struct nfc_dev *dev;
     int rc;
     u32 idx;
 
     if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
         return -EINVAL;
 
     idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 
     dev = nfc_get_device(idx);
     if (!dev)
         return -ENODEV;
 
     rc = nfc_dev_down(dev);
 
     nfc_put_device(dev);
     return rc;
 }
 
 static int nfc_genl_start_poll(struct sk_buff *skb, struct genl_info *info)
 {
     struct nfc_dev *dev;
     int rc;
     u32 idx;
     u32 im_protocols = 0, tm_protocols = 0;
 
     pr_debug("Poll start\n");
 
     if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
         ((!info->attrs[NFC_ATTR_IM_PROTOCOLS] &&
           !info->attrs[NFC_ATTR_PROTOCOLS]) &&
           !info->attrs[NFC_ATTR_TM_PROTOCOLS]))
         return -EINVAL;
 
     idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 
     if (info->attrs[NFC_ATTR_TM_PROTOCOLS])
         tm_protocols = nla_get_u32(info->attrs[NFC_ATTR_TM_PROTOCOLS]);
 
     if (info->attrs[NFC_ATTR_IM_PROTOCOLS])
         im_protocols = nla_get_u32(info->attrs[NFC_ATTR_IM_PROTOCOLS]);
     else if (info->attrs[NFC_ATTR_PROTOCOLS])
         im_protocols = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
 
     dev = nfc_get_device(idx);
     if (!dev)
         return -ENODEV;
 
     mutex_lock(&dev->genl_data.genl_data_mutex);
 
     rc = nfc_start_poll(dev, im_protocols, tm_protocols);
     if (!rc)
         dev->genl_data.poll_req_portid = info->snd_portid;
 
     mutex_unlock(&dev->genl_data.genl_data_mutex);
 
     nfc_put_device(dev);
     return rc;
 }
 
 static int nfc_genl_stop_poll(struct sk_buff *skb, struct genl_info *info)
 {
     struct nfc_dev *dev;
     int rc;
     u32 idx;
 
     if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
         return -EINVAL;
 
     idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 
     dev = nfc_get_device(idx);
     if (!dev)
         return -ENODEV;
 
     device_lock(&dev->dev);
 
     if (!dev->polling) {
         device_unlock(&dev->dev);
         nfc_put_device(dev);
         return -EINVAL;
     }
 
     device_unlock(&dev->dev);
 
     mutex_lock(&dev->genl_data.genl_data_mutex);
 
     if (dev->genl_data.poll_req_portid != info->snd_portid) {
         rc = -EBUSY;
         goto out;
     }
 
     rc = nfc_stop_poll(dev);
     dev->genl_data.poll_req_portid = 0;
 
 out:
     mutex_unlock(&dev->genl_data.genl_data_mutex);
     nfc_put_device(dev);
     return rc;
 }
 
 static int nfc_genl_activate_target(struct sk_buff *skb, struct genl_info *info)
 {
     struct nfc_dev *dev;
     u32 device_idx, target_idx, protocol;
     int rc;
 
     if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
         !info->attrs[NFC_ATTR_TARGET_INDEX] ||
         !info->attrs[NFC_ATTR_PROTOCOLS])
         return -EINVAL;
 
     device_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 
     dev = nfc_get_device(device_idx);
     if (!dev)
         return -ENODEV;
 
     target_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
     protocol = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
 
     nfc_deactivate_target(dev, target_idx, NFC_TARGET_MODE_SLEEP);
     rc = nfc_activate_target(dev, target_idx, protocol);
 
     nfc_put_device(dev);
     return rc;
 }
 
 static int nfc_genl_deactivate_target(struct sk_buff *skb,
                       struct genl_info *info)
 {
     struct nfc_dev *dev;
     u32 device_idx, target_idx;
     int rc;
 
     if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
         !info->attrs[NFC_ATTR_TARGET_INDEX])
         return -EINVAL;
 
     device_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 
     dev = nfc_get_device(device_idx);
     if (!dev)
         return -ENODEV;
 
     target_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
 
     rc = nfc_deactivate_target(dev, target_idx, NFC_TARGET_MODE_SLEEP);
 
     nfc_put_device(dev);
     return rc;
 }
 
 static int nfc_genl_dep_link_up(struct sk_buff *skb, struct genl_info *info)
 {
     struct nfc_dev *dev;
     int rc, tgt_idx;
     u32 idx;
     u8 comm;
 
     pr_debug("DEP link up\n");
 
     if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
         !info->attrs[NFC_ATTR_COMM_MODE])
         return -EINVAL;
 
     idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
     if (!info->attrs[NFC_ATTR_TARGET_INDEX])
         tgt_idx = NFC_TARGET_IDX_ANY;
     else
         tgt_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
 
     comm = nla_get_u8(info->attrs[NFC_ATTR_COMM_MODE]);
 
     if (comm != NFC_COMM_ACTIVE && comm != NFC_COMM_PASSIVE)
         return -EINVAL;
 
     dev = nfc_get_device(idx);
     if (!dev)
         return -ENODEV;
 
     rc = nfc_dep_link_up(dev, tgt_idx, comm);
 
     nfc_put_device(dev);
 
     return rc;
 }
 
 static int nfc_genl_dep_link_down(struct sk_buff *skb, struct genl_info *info)
 {
     struct nfc_dev *dev;
     int rc;
     u32 idx;
 
     if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
         !info->attrs[NFC_ATTR_TARGET_INDEX])
         return -EINVAL;
 
     idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 
     dev = nfc_get_device(idx);
     if (!dev)
         return -ENODEV;
 
     rc = nfc_dep_link_down(dev);
 
     nfc_put_device(dev);
     return rc;
 }
 
 static int nfc_genl_send_params(struct sk_buff *msg,
                 struct nfc_llcp_local *local,
                 u32 portid, u32 seq)
 {
     void *hdr;
 
     hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, 0,
               NFC_CMD_LLC_GET_PARAMS);
     if (!hdr)
         return -EMSGSIZE;
 
     if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, local->dev->idx) ||
         nla_put_u8(msg, NFC_ATTR_LLC_PARAM_LTO, local->lto) ||
         nla_put_u8(msg, NFC_ATTR_LLC_PARAM_RW, local->rw) ||
         nla_put_u16(msg, NFC_ATTR_LLC_PARAM_MIUX, be16_to_cpu(local->miux)))
         goto nla_put_failure;
 
     genlmsg_end(msg, hdr);
     return 0;
 
 nla_put_failure:
     genlmsg_cancel(msg, hdr);
     return -EMSGSIZE;
 }
 
 static int nfc_genl_llc_get_params(struct sk_buff *skb, struct genl_info *info)
 {
     struct nfc_dev *dev;
     struct nfc_llcp_local *local;
     int rc = 0;
     struct sk_buff *msg = NULL;
     u32 idx;
 
     if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
         !info->attrs[NFC_ATTR_FIRMWARE_NAME])
         return -EINVAL;
 
     idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 
     dev = nfc_get_device(idx);
     if (!dev)
         return -ENODEV;
 
     device_lock(&dev->dev);
 
     local = nfc_llcp_find_local(dev);
     if (!local) {
         rc = -ENODEV;
         goto exit;
     }
 
     msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
     if (!msg) {
         rc = -ENOMEM;
         goto exit;
     }
 
     rc = nfc_genl_send_params(msg, local, info->snd_portid, info->snd_seq);
 
 exit:
     device_unlock(&dev->dev);
 
     nfc_put_device(dev);
 
     if (rc < 0) {
         if (msg)
             nlmsg_free(msg);
 
         return rc;
     }
 
     return genlmsg_reply(msg, info);
 }
 
 static int nfc_genl_llc_set_params(struct sk_buff *skb, struct genl_info *info)
 {
     struct nfc_dev *dev;
     struct nfc_llcp_local *local;
     u8 rw = 0;
     u16 miux = 0;
     u32 idx;
     int rc = 0;
 
     if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
         (!info->attrs[NFC_ATTR_LLC_PARAM_LTO] &&
          !info->attrs[NFC_ATTR_LLC_PARAM_RW] &&
          !info->attrs[NFC_ATTR_LLC_PARAM_MIUX]))
         return -EINVAL;
 
     if (info->attrs[NFC_ATTR_LLC_PARAM_RW]) {
         rw = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_RW]);
 
         if (rw > LLCP_MAX_RW)
             return -EINVAL;
     }
 
     if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX]) {
         miux = nla_get_u16(info->attrs[NFC_ATTR_LLC_PARAM_MIUX]);
 
         if (miux > LLCP_MAX_MIUX)
             return -EINVAL;
     }
 
     idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 
     dev = nfc_get_device(idx);
     if (!dev)
         return -ENODEV;
 
     device_lock(&dev->dev);
 
     local = nfc_llcp_find_local(dev);
     if (!local) {
         rc = -ENODEV;
         goto exit;
     }
 
     if (info->attrs[NFC_ATTR_LLC_PARAM_LTO]) {
         if (dev->dep_link_up) {
             rc = -EINPROGRESS;
             goto exit;
         }
 
         local->lto = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_LTO]);
     }
 
     if (info->attrs[NFC_ATTR_LLC_PARAM_RW])
         local->rw = rw;
 
     if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX])
         local->miux = cpu_to_be16(miux);
 
 exit:
     device_unlock(&dev->dev);
 
     nfc_put_device(dev);
 
     return rc;
 }
 
 static int nfc_genl_llc_sdreq(struct sk_buff *skb, struct genl_info *info)
 {
     struct nfc_dev *dev;
     struct nfc_llcp_local *local;
     struct nlattr *attr, *sdp_attrs[NFC_SDP_ATTR_MAX+1];
     u32 idx;
     u8 tid;
     char *uri;
     int rc = 0, rem;
     size_t uri_len, tlvs_len;
     struct hlist_head sdreq_list;
     struct nfc_llcp_sdp_tlv *sdreq;
 
     if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
         !info->attrs[NFC_ATTR_LLC_SDP])
         return -EINVAL;
 
     idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 
     dev = nfc_get_device(idx);
     if (!dev)
         return -ENODEV;
 
     device_lock(&dev->dev);
 
     if (dev->dep_link_up == false) {
         rc = -ENOLINK;
         goto exit;
     }
 
     local = nfc_llcp_find_local(dev);
     if (!local) {
         rc = -ENODEV;
         goto exit;
     }
 
     INIT_HLIST_HEAD(&sdreq_list);
 
     tlvs_len = 0;
 
     nla_for_each_nested(attr, info->attrs[NFC_ATTR_LLC_SDP], rem) {
         rc = nla_parse_nested_deprecated(sdp_attrs, NFC_SDP_ATTR_MAX,
                          attr, nfc_sdp_genl_policy,
                          info->extack);
 
         if (rc != 0) {
             rc = -EINVAL;
             goto exit;
         }
 
         if (!sdp_attrs[NFC_SDP_ATTR_URI])
             continue;
 
         uri_len = nla_len(sdp_attrs[NFC_SDP_ATTR_URI]);
         if (uri_len == 0)
             continue;
 
         uri = nla_data(sdp_attrs[NFC_SDP_ATTR_URI]);
         if (uri == NULL || *uri == 0)
             continue;
 
         tid = local->sdreq_next_tid++;
 
         sdreq = nfc_llcp_build_sdreq_tlv(tid, uri, uri_len);
         if (sdreq == NULL) {
             rc = -ENOMEM;
             goto exit;
         }
 
         tlvs_len += sdreq->tlv_len;
 
         hlist_add_head(&sdreq->node, &sdreq_list);
     }
 
     if (hlist_empty(&sdreq_list)) {
         rc = -EINVAL;
         goto exit;
     }
 
     rc = nfc_llcp_send_snl_sdreq(local, &sdreq_list, tlvs_len);
 exit:
     device_unlock(&dev->dev);
 
     nfc_put_device(dev);
 
     return rc;
 }
 
 static int nfc_genl_fw_download(struct sk_buff *skb, struct genl_info *info)
 {
     struct nfc_dev *dev;
     int rc;
     u32 idx;
     char firmware_name[NFC_FIRMWARE_NAME_MAXSIZE + 1];
 
     if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || !info->attrs[NFC_ATTR_FIRMWARE_NAME])
         return -EINVAL;
 
     idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 
     dev = nfc_get_device(idx);
     if (!dev)
         return -ENODEV;
 
     nla_strscpy(firmware_name, info->attrs[NFC_ATTR_FIRMWARE_NAME],
             sizeof(firmware_name));
 
     rc = nfc_fw_download(dev, firmware_name);
 
     nfc_put_device(dev);
     return rc;
 }
 
 int nfc_genl_fw_download_done(struct nfc_dev *dev, const char *firmware_name,
                   u32 result)
 {
     struct sk_buff *msg;
     void *hdr;
 
     msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
     if (!msg)
         return -ENOMEM;
 
     hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
               NFC_CMD_FW_DOWNLOAD);
     if (!hdr)
         goto free_msg;
 
     if (nla_put_string(msg, NFC_ATTR_FIRMWARE_NAME, firmware_name) ||
         nla_put_u32(msg, NFC_ATTR_FIRMWARE_DOWNLOAD_STATUS, result) ||
         nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
         goto nla_put_failure;
 
     genlmsg_end(msg, hdr);
 
     genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
 
     return 0;
 
 nla_put_failure:
 free_msg:
     nlmsg_free(msg);
     return -EMSGSIZE;
 }
 
 static int nfc_genl_enable_se(struct sk_buff *skb, struct genl_info *info)
 {
     struct nfc_dev *dev;
     int rc;
     u32 idx, se_idx;
 
     if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
         !info->attrs[NFC_ATTR_SE_INDEX])
         return -EINVAL;
 
     idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
     se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
 
     dev = nfc_get_device(idx);
     if (!dev)
         return -ENODEV;
 
     rc = nfc_enable_se(dev, se_idx);
 
     nfc_put_device(dev);
     return rc;
 }
 
 static int nfc_genl_disable_se(struct sk_buff *skb, struct genl_info *info)
 {
     struct nfc_dev *dev;
     int rc;
     u32 idx, se_idx;
 
     if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
         !info->attrs[NFC_ATTR_SE_INDEX])
         return -EINVAL;
 
     idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
     se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
 
     dev = nfc_get_device(idx);
     if (!dev)
         return -ENODEV;
 
     rc = nfc_disable_se(dev, se_idx);
 
     nfc_put_device(dev);
     return rc;
 }
 
 static int nfc_genl_send_se(struct sk_buff *msg, struct nfc_dev *dev,
                 u32 portid, u32 seq,
                 struct netlink_callback *cb,
                 int flags)
 {
     void *hdr;
     struct nfc_se *se, *n;
 
     list_for_each_entry_safe(se, n, &dev->secure_elements, list) {
         hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, flags,
                   NFC_CMD_GET_SE);
         if (!hdr)
             goto nla_put_failure;
 
         if (cb)
             genl_dump_check_consistent(cb, hdr);
 
         if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
             nla_put_u32(msg, NFC_ATTR_SE_INDEX, se->idx) ||
             nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type))
             goto nla_put_failure;
 
         genlmsg_end(msg, hdr);
     }
 
     return 0;
 
 nla_put_failure:
     genlmsg_cancel(msg, hdr);
     return -EMSGSIZE;
 }
 
 static int nfc_genl_dump_ses(struct sk_buff *skb,
                  struct netlink_callback *cb)
 {
     struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
     struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
     bool first_call = false;
 
     if (!iter) {
         first_call = true;
         iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
         if (!iter)
             return -ENOMEM;
         cb->args[0] = (long) iter;
     }
 
     mutex_lock(&nfc_devlist_mutex);
 
     cb->seq = nfc_devlist_generation;
 
     if (first_call) {
         nfc_device_iter_init(iter);
         dev = nfc_device_iter_next(iter);
     }
 
     while (dev) {
         int rc;
 
         rc = nfc_genl_send_se(skb, dev, NETLINK_CB(cb->skb).portid,
                       cb->nlh->nlmsg_seq, cb, NLM_F_MULTI);
         if (rc < 0)
             break;
 
         dev = nfc_device_iter_next(iter);
     }
 
     mutex_unlock(&nfc_devlist_mutex);
 
     cb->args[1] = (long) dev;
 
     return skb->len;
 }
 
 static int nfc_genl_dump_ses_done(struct netlink_callback *cb)
 {
     struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
 
     if (iter) {
         nfc_device_iter_exit(iter);
         kfree(iter);
     }
 
     return 0;
 }
 
 static int nfc_se_io(struct nfc_dev *dev, u32 se_idx,
              u8 *apdu, size_t apdu_length,
              se_io_cb_t cb, void *cb_context)
 {
     struct nfc_se *se;
     int rc;
 
     pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
 
     device_lock(&dev->dev);
 
     if (!device_is_registered(&dev->dev)) {
         rc = -ENODEV;
         goto error;
     }
 
     if (!dev->dev_up) {
         rc = -ENODEV;
         goto error;
     }
 
     if (!dev->ops->se_io) {
         rc = -EOPNOTSUPP;
         goto error;
     }
 
     se = nfc_find_se(dev, se_idx);
     if (!se) {
         rc = -EINVAL;
         goto error;
     }
 
     if (se->state != NFC_SE_ENABLED) {
         rc = -ENODEV;
         goto error;
     }
 
     rc = dev->ops->se_io(dev, se_idx, apdu,
             apdu_length, cb, cb_context);
 
 error:
     device_unlock(&dev->dev);
     return rc;
 }
 
 struct se_io_ctx {
     u32 dev_idx;
     u32 se_idx;
 };
 
 static void se_io_cb(void *context, u8 *apdu, size_t apdu_len, int err)
 {
     struct se_io_ctx *ctx = context;
     struct sk_buff *msg;
     void *hdr;
 
     msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
     if (!msg) {
         kfree(ctx);
         return;
     }
 
     hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
               NFC_CMD_SE_IO);
     if (!hdr)
         goto free_msg;
 
     if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, ctx->dev_idx) ||
         nla_put_u32(msg, NFC_ATTR_SE_INDEX, ctx->se_idx) ||
         nla_put(msg, NFC_ATTR_SE_APDU, apdu_len, apdu))
         goto nla_put_failure;
 
     genlmsg_end(msg, hdr);
 
     genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
 
     kfree(ctx);
 
     return;
 
 nla_put_failure:
 free_msg:
     nlmsg_free(msg);
     kfree(ctx);
 
     return;
 }
 
 static int nfc_genl_se_io(struct sk_buff *skb, struct genl_info *info)
 {
     struct nfc_dev *dev;
     struct se_io_ctx *ctx;
     u32 dev_idx, se_idx;
     u8 *apdu;
     size_t apdu_len;
 
     if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
         !info->attrs[NFC_ATTR_SE_INDEX] ||
         !info->attrs[NFC_ATTR_SE_APDU])
         return -EINVAL;
 
     dev_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
     se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
 
     dev = nfc_get_device(dev_idx);
     if (!dev)
         return -ENODEV;
 
     if (!dev->ops || !dev->ops->se_io)
         return -ENOTSUPP;
 
     apdu_len = nla_len(info->attrs[NFC_ATTR_SE_APDU]);
     if (apdu_len == 0)
         return -EINVAL;
 
     apdu = nla_data(info->attrs[NFC_ATTR_SE_APDU]);
     if (!apdu)
         return -EINVAL;
 
     ctx = kzalloc(sizeof(struct se_io_ctx), GFP_KERNEL);
     if (!ctx)
         return -ENOMEM;
 
     ctx->dev_idx = dev_idx;
     ctx->se_idx = se_idx;
 
     return nfc_se_io(dev, se_idx, apdu, apdu_len, se_io_cb, ctx);
 }
 
 static int nfc_genl_vendor_cmd(struct sk_buff *skb,
                    struct genl_info *info)
 {
     struct nfc_dev *dev;
     const struct nfc_vendor_cmd *cmd;
     u32 dev_idx, vid, subcmd;
     u8 *data;
     size_t data_len;
     int i, err;
 
     if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
         !info->attrs[NFC_ATTR_VENDOR_ID] ||
         !info->attrs[NFC_ATTR_VENDOR_SUBCMD])
         return -EINVAL;
 
     dev_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
     vid = nla_get_u32(info->attrs[NFC_ATTR_VENDOR_ID]);
     subcmd = nla_get_u32(info->attrs[NFC_ATTR_VENDOR_SUBCMD]);
 
     dev = nfc_get_device(dev_idx);
     if (!dev || !dev->vendor_cmds || !dev->n_vendor_cmds)
         return -ENODEV;
 
     if (info->attrs[NFC_ATTR_VENDOR_DATA]) {
         data = nla_data(info->attrs[NFC_ATTR_VENDOR_DATA]);
         data_len = nla_len(info->attrs[NFC_ATTR_VENDOR_DATA]);
         if (data_len == 0)
             return -EINVAL;
     } else {
         data = NULL;
         data_len = 0;
     }
 
     for (i = 0; i < dev->n_vendor_cmds; i++) {
         cmd = &dev->vendor_cmds[i];
 
         if (cmd->vendor_id != vid || cmd->subcmd != subcmd)
             continue;
 
         dev->cur_cmd_info = info;
         err = cmd->doit(dev, data, data_len);
         dev->cur_cmd_info = NULL;
         return err;
     }
 
     return -EOPNOTSUPP;
 }
 
 /* message building helper */
 static inline void *nfc_hdr_put(struct sk_buff *skb, u32 portid, u32 seq,
                 int flags, u8 cmd)
 {
     /* since there is no private header just add the generic one */
     return genlmsg_put(skb, portid, seq, &nfc_genl_family, flags, cmd);
 }
 
 static struct sk_buff *
 __nfc_alloc_vendor_cmd_skb(struct nfc_dev *dev, int approxlen,
                u32 portid, u32 seq,
                enum nfc_attrs attr,
                u32 oui, u32 subcmd, gfp_t gfp)
 {
     struct sk_buff *skb;
     void *hdr;
 
     skb = nlmsg_new(approxlen + 100, gfp);
     if (!skb)
         return NULL;
 
     hdr = nfc_hdr_put(skb, portid, seq, 0, NFC_CMD_VENDOR);
     if (!hdr) {
         kfree_skb(skb);
         return NULL;
     }
 
     if (nla_put_u32(skb, NFC_ATTR_DEVICE_INDEX, dev->idx))
         goto nla_put_failure;
     if (nla_put_u32(skb, NFC_ATTR_VENDOR_ID, oui))
         goto nla_put_failure;
     if (nla_put_u32(skb, NFC_ATTR_VENDOR_SUBCMD, subcmd))
         goto nla_put_failure;
 
     ((void **)skb->cb)[0] = dev;
     ((void **)skb->cb)[1] = hdr;
 
     return skb;
 
 nla_put_failure:
     kfree_skb(skb);
     return NULL;
 }
 
 struct sk_buff *__nfc_alloc_vendor_cmd_reply_skb(struct nfc_dev *dev,
                          enum nfc_attrs attr,
                          u32 oui, u32 subcmd,
                          int approxlen)
 {
     if (WARN_ON(!dev->cur_cmd_info))
         return NULL;
 
     return __nfc_alloc_vendor_cmd_skb(dev, approxlen,
                       dev->cur_cmd_info->snd_portid,
                       dev->cur_cmd_info->snd_seq, attr,
                       oui, subcmd, GFP_KERNEL);
 }
 EXPORT_SYMBOL(__nfc_alloc_vendor_cmd_reply_skb);
 
 int nfc_vendor_cmd_reply(struct sk_buff *skb)
 {
     struct nfc_dev *dev = ((void **)skb->cb)[0];
     void *hdr = ((void **)skb->cb)[1];
 
     /* clear CB data for netlink core to own from now on */
     memset(skb->cb, 0, sizeof(skb->cb));
 
     if (WARN_ON(!dev->cur_cmd_info)) {
         kfree_skb(skb);
         return -EINVAL;
     }
 
     genlmsg_end(skb, hdr);
     return genlmsg_reply(skb, dev->cur_cmd_info);
 }
 EXPORT_SYMBOL(nfc_vendor_cmd_reply);
 
 static const struct genl_ops nfc_genl_ops[] = {
     {
         .cmd = NFC_CMD_GET_DEVICE,
         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
         .doit = nfc_genl_get_device,
         .dumpit = nfc_genl_dump_devices,
         .done = nfc_genl_dump_devices_done,
     },
     {
         .cmd = NFC_CMD_DEV_UP,
         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
         .doit = nfc_genl_dev_up,
         .flags = GENL_ADMIN_PERM,
     },
     {
         .cmd = NFC_CMD_DEV_DOWN,
         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
         .doit = nfc_genl_dev_down,
         .flags = GENL_ADMIN_PERM,
     },
     {
         .cmd = NFC_CMD_START_POLL,
         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
         .doit = nfc_genl_start_poll,
         .flags = GENL_ADMIN_PERM,
     },
     {
         .cmd = NFC_CMD_STOP_POLL,
         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
         .doit = nfc_genl_stop_poll,
         .flags = GENL_ADMIN_PERM,
     },
     {
         .cmd = NFC_CMD_DEP_LINK_UP,
         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
         .doit = nfc_genl_dep_link_up,
         .flags = GENL_ADMIN_PERM,
     },
     {
         .cmd = NFC_CMD_DEP_LINK_DOWN,
         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
         .doit = nfc_genl_dep_link_down,
         .flags = GENL_ADMIN_PERM,
     },
     {
         .cmd = NFC_CMD_GET_TARGET,
         .validate = GENL_DONT_VALIDATE_STRICT |
                 GENL_DONT_VALIDATE_DUMP_STRICT,
         .dumpit = nfc_genl_dump_targets,
         .done = nfc_genl_dump_targets_done,
     },
     {
         .cmd = NFC_CMD_LLC_GET_PARAMS,
         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
         .doit = nfc_genl_llc_get_params,
     },
     {
         .cmd = NFC_CMD_LLC_SET_PARAMS,
         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
         .doit = nfc_genl_llc_set_params,
         .flags = GENL_ADMIN_PERM,
     },
     {
         .cmd = NFC_CMD_LLC_SDREQ,
         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
         .doit = nfc_genl_llc_sdreq,
         .flags = GENL_ADMIN_PERM,
     },
     {
         .cmd = NFC_CMD_FW_DOWNLOAD,
         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
         .doit = nfc_genl_fw_download,
         .flags = GENL_ADMIN_PERM,
     },
     {
         .cmd = NFC_CMD_ENABLE_SE,
         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
         .doit = nfc_genl_enable_se,
         .flags = GENL_ADMIN_PERM,
     },
     {
         .cmd = NFC_CMD_DISABLE_SE,
         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
         .doit = nfc_genl_disable_se,
         .flags = GENL_ADMIN_PERM,
     },
     {
         .cmd = NFC_CMD_GET_SE,
         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
         .dumpit = nfc_genl_dump_ses,
         .done = nfc_genl_dump_ses_done,
     },
     {
         .cmd = NFC_CMD_SE_IO,
         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
         .doit = nfc_genl_se_io,
         .flags = GENL_ADMIN_PERM,
     },
     {
         .cmd = NFC_CMD_ACTIVATE_TARGET,
         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
         .doit = nfc_genl_activate_target,
         .flags = GENL_ADMIN_PERM,
     },
     {
         .cmd = NFC_CMD_VENDOR,
         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
         .doit = nfc_genl_vendor_cmd,
         .flags = GENL_ADMIN_PERM,
     },
     {
         .cmd = NFC_CMD_DEACTIVATE_TARGET,
         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
         .doit = nfc_genl_deactivate_target,
         .flags = GENL_ADMIN_PERM,
     },
 };
 
 static struct genl_family nfc_genl_family __ro_after_init = {
     .hdrsize = 0,
     .name = NFC_GENL_NAME,
     .version = NFC_GENL_VERSION,
     .maxattr = NFC_ATTR_MAX,
     .policy = nfc_genl_policy,
     .module = THIS_MODULE,
     .ops = nfc_genl_ops,
     .n_ops = ARRAY_SIZE(nfc_genl_ops),
     .mcgrps = nfc_genl_mcgrps,
     .n_mcgrps = ARRAY_SIZE(nfc_genl_mcgrps),
 };
 
 
 struct urelease_work {
     struct  work_struct w;
     u32 portid;
 };
 
 static void nfc_urelease_event_work(struct work_struct *work)
 {
     struct urelease_work *w = container_of(work, struct urelease_work, w);
     struct class_dev_iter iter;
     struct nfc_dev *dev;
 
     pr_debug("portid %d\n", w->portid);
 
     mutex_lock(&nfc_devlist_mutex);
 
     nfc_device_iter_init(&iter);
     dev = nfc_device_iter_next(&iter);
 
     while (dev) {
         mutex_lock(&dev->genl_data.genl_data_mutex);
 
         if (dev->genl_data.poll_req_portid == w->portid) {
             nfc_stop_poll(dev);
             dev->genl_data.poll_req_portid = 0;
         }
 
         mutex_unlock(&dev->genl_data.genl_data_mutex);
 
         dev = nfc_device_iter_next(&iter);
     }
 
     nfc_device_iter_exit(&iter);
 
     mutex_unlock(&nfc_devlist_mutex);
 
     kfree(w);
 }
 
 static int nfc_genl_rcv_nl_event(struct notifier_block *this,
                  unsigned long event, void *ptr)
 {
     struct netlink_notify *n = ptr;
     struct urelease_work *w;
 
     if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC)
         goto out;
 
     pr_debug("NETLINK_URELEASE event from id %d\n", n->portid);
 
     w = kmalloc(sizeof(*w), GFP_ATOMIC);
     if (w) {
         INIT_WORK(&w->w, nfc_urelease_event_work);
         w->portid = n->portid;
         schedule_work(&w->w);
     }
 
 out:
     return NOTIFY_DONE;
 }
 
 void nfc_genl_data_init(struct nfc_genl_data *genl_data)
 {
     genl_data->poll_req_portid = 0;
     mutex_init(&genl_data->genl_data_mutex);
 }
 
 void nfc_genl_data_exit(struct nfc_genl_data *genl_data)
 {
     mutex_destroy(&genl_data->genl_data_mutex);
 }
 
 static struct notifier_block nl_notifier = {
     .notifier_call  = nfc_genl_rcv_nl_event,
 };
 
 /**
  * nfc_genl_init() - Initialize netlink interface
  *
  * This initialization function registers the nfc netlink family.
  */
 int __init nfc_genl_init(void)
 {
     int rc;
 
     rc = genl_register_family(&nfc_genl_family);
     if (rc)
         return rc;
 
     netlink_register_notifier(&nl_notifier);
 
     return 0;
 }
 
 /**
  * nfc_genl_exit() - Deinitialize netlink interface
  *
  * This exit function unregisters the nfc netlink family.
  */
 void nfc_genl_exit(void)
 {
     netlink_unregister_notifier(&nl_notifier);
     genl_unregister_family(&nfc_genl_family);
 }

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