- 根目录:
- net
- nfc
- netlink.c
/*
* 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, see <http://www.gnu.org/licenses/>.
*/
#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 = {
.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 },
[NFC_ATTR_FIRMWARE_NAME] = { .type = NLA_STRING,
.len = NFC_FIRMWARE_NAME_MAXSIZE },
[NFC_ATTR_SE_APDU] = { .type = NLA_BINARY },
};
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(&nfc_genl_family, msg, 0, 0, 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(&nfc_genl_family, msg, 0, 0, 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(&nfc_genl_family, msg, 0, 0, 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(&nfc_genl_family, msg, 0, 0, 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(&nfc_genl_family, msg, 0, 0, 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(&nfc_genl_family, msg, 0, 0, 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(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
nla_put_failure:
genlmsg_cancel(msg, hdr);
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:
genlmsg_cancel(msg, hdr);
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:
genlmsg_cancel(msg, hdr);
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, &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_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(&nfc_genl_family, msg, 0, 0, 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(&nfc_genl_family, msg, 0, 0, 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 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])
return -EINVAL;
idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
dev = nfc_get_device(idx);
if (!dev)
return -ENODEV;
nla_strlcpy(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_KERNEL);
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_KERNEL);
return 0;
nla_put_failure:
genlmsg_cancel(msg, hdr);
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, &nfc_genl_family);
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;
if (genlmsg_end(msg, hdr) < 0)
goto nla_put_failure;
}
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];
nfc_device_iter_exit(iter);
kfree(iter);
return 0;
}
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:
genlmsg_cancel(msg, hdr);
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 dev->ops->se_io(dev, se_idx, apdu, apdu_len, se_io_cb, ctx);
}
static const 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,
},
{
.cmd = NFC_CMD_FW_DOWNLOAD,
.doit = nfc_genl_fw_download,
.policy = nfc_genl_policy,
},
{
.cmd = NFC_CMD_ENABLE_SE,
.doit = nfc_genl_enable_se,
.policy = nfc_genl_policy,
},
{
.cmd = NFC_CMD_DISABLE_SE,
.doit = nfc_genl_disable_se,
.policy = nfc_genl_policy,
},
{
.cmd = NFC_CMD_GET_SE,
.dumpit = nfc_genl_dump_ses,
.done = nfc_genl_dump_ses_done,
.policy = nfc_genl_policy,
},
{
.cmd = NFC_CMD_SE_IO,
.doit = nfc_genl_se_io,
.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_groups(&nfc_genl_family,
nfc_genl_ops,
nfc_genl_mcgrps);
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);
}