/net/nfc/netlink.c
C | 1195 lines | 880 code | 283 blank | 32 comment | 132 complexity | 6eacd083296523482f5e976adabbe86a MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
- /*
- * Copyright (C) 2011 Instituto Nokia de Tecnologia
- *
- * Authors:
- * Lauro Ramos Venancio <lauro.venancio@openbossa.org>
- * Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * 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.,
- * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- */
- #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 struct genl_multicast_group nfc_genl_event_mcgrp = {
- .name = NFC_GENL_MCAST_EVENT_NAME,
- };
- static struct genl_family nfc_genl_family = {
- .id = GENL_ID_GENERATE,
- .hdrsize = 0,
- .name = NFC_GENL_NAME,
- .version = NFC_GENL_VERSION,
- .maxattr = NFC_ATTR_MAX,
- };
- 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_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 },
- };
- static const struct nla_policy nfc_sdp_genl_policy[NFC_SDP_ATTR_MAX + 1] = {
- [NFC_SDP_ATTR_URI] = { .type = NLA_STRING },
- [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, &nfc_genl_family);
- 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;
- return genlmsg_end(msg, hdr);
- nla_put_failure:
- genlmsg_cancel(msg, hdr);
- return -EMSGSIZE;
- }
- static struct nfc_dev *__get_device_from_cb(struct netlink_callback *cb)
- {
- struct nfc_dev *dev;
- int rc;
- u32 idx;
- rc = nlmsg_parse(cb->nlh, GENL_HDRLEN + nfc_genl_family.hdrsize,
- nfc_genl_family.attrbuf,
- nfc_genl_family.maxattr,
- nfc_genl_policy);
- if (rc < 0)
- return ERR_PTR(rc);
- if (!nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX])
- return ERR_PTR(-EINVAL);
- idx = nla_get_u32(nfc_genl_family.attrbuf[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(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
- nla_put_failure:
- genlmsg_cancel(msg, hdr);
- 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(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
- return 0;
- nla_put_failure:
- genlmsg_cancel(msg, hdr);
- 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(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
- return 0;
- nla_put_failure:
- genlmsg_cancel(msg, hdr);
- 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(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
- return 0;
- nla_put_failure:
- genlmsg_cancel(msg, hdr);
- free_msg:
- nlmsg_free(msg);
- return -EMSGSIZE;
- }
- 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 (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))
- goto nla_put_failure;
- genlmsg_end(msg, hdr);
- genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
- return 0;
- nla_put_failure:
- genlmsg_cancel(msg, hdr);
- 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(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
- return 0;
- nla_put_failure:
- genlmsg_cancel(msg, hdr);
- 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(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(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(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
- nla_put_failure:
- genlmsg_cancel(msg, hdr);
- free_msg:
- nlmsg_free(msg);
- nfc_llcp_free_sdp_tlv_list(sdres_list);
- return rc;
- }
- 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, &nfc_genl_family);
- 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_u32(msg, NFC_ATTR_SE, dev->supported_se) ||
- nla_put_u8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up) ||
- nla_put_u8(msg, NFC_ATTR_RF_MODE, dev->rf_mode))
- goto nla_put_failure;
- return genlmsg_end(msg, hdr);
- 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];
- 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(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
- return 0;
- nla_put_failure:
- genlmsg_cancel(msg, hdr);
- 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(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
- return 0;
- nla_put_failure:
- genlmsg_cancel(msg, hdr);
- 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);
- 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_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])
- 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;
- return genlmsg_end(msg, hdr);
- 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])
- 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) {
- nfc_put_device(dev);
- 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) {
- rc = -ENODEV;
- goto exit;
- }
- device_lock(&dev->dev);
- if (dev->dep_link_up == false) {
- rc = -ENOLINK;
- goto exit;
- }
- local = nfc_llcp_find_local(dev);
- if (!local) {
- nfc_put_device(dev);
- 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(sdp_attrs, NFC_SDP_ATTR_MAX, attr,
- nfc_sdp_genl_policy);
- 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 struct genl_ops nfc_genl_ops[] = {
- {
- .cmd = NFC_CMD_GET_DEVICE,
- .doit = nfc_genl_get_device,
- .dumpit = nfc_genl_dump_devices,
- .done = nfc_genl_dump_devices_done,
- .policy = nfc_genl_policy,
- },
- {
- .cmd = NFC_CMD_DEV_UP,
- .doit = nfc_genl_dev_up,
- .policy = nfc_genl_policy,
- },
- {
- .cmd = NFC_CMD_DEV_DOWN,
- .doit = nfc_genl_dev_down,
- .policy = nfc_genl_policy,
- },
- {
- .cmd = NFC_CMD_START_POLL,
- .doit = nfc_genl_start_poll,
- .policy = nfc_genl_policy,
- },
- {
- .cmd = NFC_CMD_STOP_POLL,
- .doit = nfc_genl_stop_poll,
- .policy = nfc_genl_policy,
- },
- {
- .cmd = NFC_CMD_DEP_LINK_UP,
- .doit = nfc_genl_dep_link_up,
- .policy = nfc_genl_policy,
- },
- {
- .cmd = NFC_CMD_DEP_LINK_DOWN,
- .doit = nfc_genl_dep_link_down,
- .policy = nfc_genl_policy,
- },
- {
- .cmd = NFC_CMD_GET_TARGET,
- .dumpit = nfc_genl_dump_targets,
- .done = nfc_genl_dump_targets_done,
- .policy = nfc_genl_policy,
- },
- {
- .cmd = NFC_CMD_LLC_GET_PARAMS,
- .doit = nfc_genl_llc_get_params,
- .policy = nfc_genl_policy,
- },
- {
- .cmd = NFC_CMD_LLC_SET_PARAMS,
- .doit = nfc_genl_llc_set_params,
- .policy = nfc_genl_policy,
- },
- {
- .cmd = NFC_CMD_LLC_SDREQ,
- .doit = nfc_genl_llc_sdreq,
- .policy = nfc_genl_policy,
- },
- };
- struct urelease_work {
- struct work_struct w;
- int 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((struct work_struct *) w, nfc_urelease_event_work);
- w->portid = n->portid;
- schedule_work((struct work_struct *) 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_with_ops(&nfc_genl_family, nfc_genl_ops,
- ARRAY_SIZE(nfc_genl_ops));
- if (rc)
- return rc;
- rc = genl_register_mc_group(&nfc_genl_family, &nfc_genl_event_mcgrp);
- netlink_register_notifier(&nl_notifier);
- return rc;
- }
- /**
- * 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);
- }