538 lines
11 KiB
C
538 lines
11 KiB
C
/*
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* Copyright (C) 2011 Instituto Nokia de Tecnologia
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*
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* Authors:
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* Lauro Ramos Venancio <lauro.venancio@openbossa.org>
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* Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the
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* Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <net/genetlink.h>
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#include <linux/nfc.h>
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#include <linux/slab.h>
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#include "nfc.h"
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static struct genl_multicast_group nfc_genl_event_mcgrp = {
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.name = NFC_GENL_MCAST_EVENT_NAME,
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};
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struct genl_family nfc_genl_family = {
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.id = GENL_ID_GENERATE,
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.hdrsize = 0,
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.name = NFC_GENL_NAME,
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.version = NFC_GENL_VERSION,
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.maxattr = NFC_ATTR_MAX,
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};
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static const struct nla_policy nfc_genl_policy[NFC_ATTR_MAX + 1] = {
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[NFC_ATTR_DEVICE_INDEX] = { .type = NLA_U32 },
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[NFC_ATTR_DEVICE_NAME] = { .type = NLA_STRING,
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.len = NFC_DEVICE_NAME_MAXSIZE },
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[NFC_ATTR_PROTOCOLS] = { .type = NLA_U32 },
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};
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static int nfc_genl_send_target(struct sk_buff *msg, struct nfc_target *target,
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struct netlink_callback *cb, int flags)
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{
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void *hdr;
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nfc_dbg("entry");
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hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
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&nfc_genl_family, flags, NFC_CMD_GET_TARGET);
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if (!hdr)
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return -EMSGSIZE;
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genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
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NLA_PUT_U32(msg, NFC_ATTR_TARGET_INDEX, target->idx);
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NLA_PUT_U32(msg, NFC_ATTR_PROTOCOLS,
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target->supported_protocols);
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NLA_PUT_U16(msg, NFC_ATTR_TARGET_SENS_RES, target->sens_res);
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NLA_PUT_U8(msg, NFC_ATTR_TARGET_SEL_RES, target->sel_res);
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return genlmsg_end(msg, hdr);
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nla_put_failure:
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genlmsg_cancel(msg, hdr);
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return -EMSGSIZE;
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}
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static struct nfc_dev *__get_device_from_cb(struct netlink_callback *cb)
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{
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struct nfc_dev *dev;
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int rc;
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u32 idx;
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rc = nlmsg_parse(cb->nlh, GENL_HDRLEN + nfc_genl_family.hdrsize,
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nfc_genl_family.attrbuf,
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nfc_genl_family.maxattr,
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nfc_genl_policy);
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if (rc < 0)
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return ERR_PTR(rc);
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if (!nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX])
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return ERR_PTR(-EINVAL);
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idx = nla_get_u32(nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX]);
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dev = nfc_get_device(idx);
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if (!dev)
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return ERR_PTR(-ENODEV);
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return dev;
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}
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static int nfc_genl_dump_targets(struct sk_buff *skb,
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struct netlink_callback *cb)
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{
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int i = cb->args[0];
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struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
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int rc;
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nfc_dbg("entry");
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if (!dev) {
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dev = __get_device_from_cb(cb);
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if (IS_ERR(dev))
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return PTR_ERR(dev);
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cb->args[1] = (long) dev;
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}
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spin_lock_bh(&dev->targets_lock);
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cb->seq = dev->targets_generation;
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while (i < dev->n_targets) {
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rc = nfc_genl_send_target(skb, &dev->targets[i], cb,
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NLM_F_MULTI);
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if (rc < 0)
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break;
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i++;
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}
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spin_unlock_bh(&dev->targets_lock);
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cb->args[0] = i;
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return skb->len;
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}
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static int nfc_genl_dump_targets_done(struct netlink_callback *cb)
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{
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struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
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nfc_dbg("entry");
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if (dev)
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nfc_put_device(dev);
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return 0;
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}
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int nfc_genl_targets_found(struct nfc_dev *dev)
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{
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struct sk_buff *msg;
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void *hdr;
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nfc_dbg("entry");
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dev->genl_data.poll_req_pid = 0;
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msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
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if (!msg)
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return -ENOMEM;
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hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
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NFC_EVENT_TARGETS_FOUND);
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if (!hdr)
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goto free_msg;
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NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
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genlmsg_end(msg, hdr);
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return genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
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nla_put_failure:
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genlmsg_cancel(msg, hdr);
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free_msg:
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nlmsg_free(msg);
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return -EMSGSIZE;
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}
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int nfc_genl_device_added(struct nfc_dev *dev)
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{
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struct sk_buff *msg;
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void *hdr;
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nfc_dbg("entry");
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msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
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if (!msg)
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return -ENOMEM;
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hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
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NFC_EVENT_DEVICE_ADDED);
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if (!hdr)
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goto free_msg;
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NLA_PUT_STRING(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev));
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NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
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NLA_PUT_U32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols);
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genlmsg_end(msg, hdr);
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genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
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return 0;
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nla_put_failure:
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genlmsg_cancel(msg, hdr);
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free_msg:
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nlmsg_free(msg);
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return -EMSGSIZE;
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}
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int nfc_genl_device_removed(struct nfc_dev *dev)
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{
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struct sk_buff *msg;
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void *hdr;
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nfc_dbg("entry");
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msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
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if (!msg)
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return -ENOMEM;
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hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
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NFC_EVENT_DEVICE_REMOVED);
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if (!hdr)
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goto free_msg;
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NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
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genlmsg_end(msg, hdr);
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genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
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return 0;
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nla_put_failure:
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genlmsg_cancel(msg, hdr);
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free_msg:
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nlmsg_free(msg);
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return -EMSGSIZE;
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}
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static int nfc_genl_send_device(struct sk_buff *msg, struct nfc_dev *dev,
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u32 pid, u32 seq,
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struct netlink_callback *cb,
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int flags)
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{
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void *hdr;
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nfc_dbg("entry");
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hdr = genlmsg_put(msg, pid, seq, &nfc_genl_family, flags,
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NFC_CMD_GET_DEVICE);
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if (!hdr)
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return -EMSGSIZE;
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if (cb)
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genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
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NLA_PUT_STRING(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev));
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NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
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NLA_PUT_U32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols);
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return genlmsg_end(msg, hdr);
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nla_put_failure:
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genlmsg_cancel(msg, hdr);
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return -EMSGSIZE;
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}
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static int nfc_genl_dump_devices(struct sk_buff *skb,
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struct netlink_callback *cb)
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{
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struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
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struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
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bool first_call = false;
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nfc_dbg("entry");
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if (!iter) {
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first_call = true;
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iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
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if (!iter)
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return -ENOMEM;
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cb->args[0] = (long) iter;
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}
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mutex_lock(&nfc_devlist_mutex);
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cb->seq = nfc_devlist_generation;
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if (first_call) {
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nfc_device_iter_init(iter);
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dev = nfc_device_iter_next(iter);
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}
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while (dev) {
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int rc;
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rc = nfc_genl_send_device(skb, dev, NETLINK_CB(cb->skb).pid,
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cb->nlh->nlmsg_seq,
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cb, NLM_F_MULTI);
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if (rc < 0)
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break;
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dev = nfc_device_iter_next(iter);
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}
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mutex_unlock(&nfc_devlist_mutex);
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cb->args[1] = (long) dev;
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return skb->len;
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}
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static int nfc_genl_dump_devices_done(struct netlink_callback *cb)
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{
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struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
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nfc_dbg("entry");
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nfc_device_iter_exit(iter);
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kfree(iter);
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return 0;
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}
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static int nfc_genl_get_device(struct sk_buff *skb, struct genl_info *info)
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{
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struct sk_buff *msg;
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struct nfc_dev *dev;
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u32 idx;
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int rc = -ENOBUFS;
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nfc_dbg("entry");
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if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
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return -EINVAL;
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idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
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dev = nfc_get_device(idx);
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if (!dev)
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return -ENODEV;
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msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
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if (!msg) {
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rc = -ENOMEM;
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goto out_putdev;
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}
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rc = nfc_genl_send_device(msg, dev, info->snd_pid, info->snd_seq,
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NULL, 0);
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if (rc < 0)
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goto out_free;
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nfc_put_device(dev);
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return genlmsg_reply(msg, info);
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out_free:
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nlmsg_free(msg);
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out_putdev:
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nfc_put_device(dev);
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return rc;
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}
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static int nfc_genl_start_poll(struct sk_buff *skb, struct genl_info *info)
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{
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struct nfc_dev *dev;
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int rc;
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u32 idx;
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u32 protocols;
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nfc_dbg("entry");
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if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
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!info->attrs[NFC_ATTR_PROTOCOLS])
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return -EINVAL;
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idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
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protocols = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
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dev = nfc_get_device(idx);
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if (!dev)
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return -ENODEV;
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mutex_lock(&dev->genl_data.genl_data_mutex);
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rc = nfc_start_poll(dev, protocols);
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if (!rc)
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dev->genl_data.poll_req_pid = info->snd_pid;
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mutex_unlock(&dev->genl_data.genl_data_mutex);
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nfc_put_device(dev);
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return rc;
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}
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static int nfc_genl_stop_poll(struct sk_buff *skb, struct genl_info *info)
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{
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struct nfc_dev *dev;
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int rc;
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u32 idx;
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nfc_dbg("entry");
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if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
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return -EINVAL;
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idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
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dev = nfc_get_device(idx);
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if (!dev)
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return -ENODEV;
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mutex_lock(&dev->genl_data.genl_data_mutex);
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if (dev->genl_data.poll_req_pid != info->snd_pid) {
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rc = -EBUSY;
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goto out;
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}
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rc = nfc_stop_poll(dev);
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dev->genl_data.poll_req_pid = 0;
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out:
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mutex_unlock(&dev->genl_data.genl_data_mutex);
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nfc_put_device(dev);
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return rc;
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}
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static struct genl_ops nfc_genl_ops[] = {
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{
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.cmd = NFC_CMD_GET_DEVICE,
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.doit = nfc_genl_get_device,
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.dumpit = nfc_genl_dump_devices,
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.done = nfc_genl_dump_devices_done,
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.policy = nfc_genl_policy,
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},
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{
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.cmd = NFC_CMD_START_POLL,
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.doit = nfc_genl_start_poll,
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.policy = nfc_genl_policy,
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},
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{
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.cmd = NFC_CMD_STOP_POLL,
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.doit = nfc_genl_stop_poll,
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.policy = nfc_genl_policy,
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},
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{
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.cmd = NFC_CMD_GET_TARGET,
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.dumpit = nfc_genl_dump_targets,
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.done = nfc_genl_dump_targets_done,
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.policy = nfc_genl_policy,
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},
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};
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static int nfc_genl_rcv_nl_event(struct notifier_block *this,
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unsigned long event, void *ptr)
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{
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struct netlink_notify *n = ptr;
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struct class_dev_iter iter;
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struct nfc_dev *dev;
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if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC)
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goto out;
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nfc_dbg("NETLINK_URELEASE event from id %d", n->pid);
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nfc_device_iter_init(&iter);
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dev = nfc_device_iter_next(&iter);
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while (dev) {
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mutex_lock(&dev->genl_data.genl_data_mutex);
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if (dev->genl_data.poll_req_pid == n->pid) {
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nfc_stop_poll(dev);
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dev->genl_data.poll_req_pid = 0;
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}
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mutex_unlock(&dev->genl_data.genl_data_mutex);
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dev = nfc_device_iter_next(&iter);
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}
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nfc_device_iter_exit(&iter);
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out:
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return NOTIFY_DONE;
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}
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void nfc_genl_data_init(struct nfc_genl_data *genl_data)
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{
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genl_data->poll_req_pid = 0;
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mutex_init(&genl_data->genl_data_mutex);
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}
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void nfc_genl_data_exit(struct nfc_genl_data *genl_data)
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{
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mutex_destroy(&genl_data->genl_data_mutex);
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}
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static struct notifier_block nl_notifier = {
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.notifier_call = nfc_genl_rcv_nl_event,
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};
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/**
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* nfc_genl_init() - Initialize netlink interface
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*
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* This initialization function registers the nfc netlink family.
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*/
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int __init nfc_genl_init(void)
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{
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int rc;
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rc = genl_register_family_with_ops(&nfc_genl_family, nfc_genl_ops,
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ARRAY_SIZE(nfc_genl_ops));
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if (rc)
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return rc;
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rc = genl_register_mc_group(&nfc_genl_family, &nfc_genl_event_mcgrp);
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netlink_register_notifier(&nl_notifier);
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return rc;
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}
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/**
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* nfc_genl_exit() - Deinitialize netlink interface
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*
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* This exit function unregisters the nfc netlink family.
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*/
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void nfc_genl_exit(void)
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{
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netlink_unregister_notifier(&nl_notifier);
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genl_unregister_family(&nfc_genl_family);
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}
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