mirror of
https://github.com/torvalds/linux
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11aa9c28b4
In preparation for changing how struct net is refcounted on kernel sockets pass the knowledge that we are creating a kernel socket from sock_create_kern through to sk_alloc. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
97 lines
2.4 KiB
C
97 lines
2.4 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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* Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
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* Lauro Ramos Venancio <lauro.venancio@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, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/nfc.h>
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#include <linux/module.h>
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#include "nfc.h"
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static DEFINE_RWLOCK(proto_tab_lock);
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static const struct nfc_protocol *proto_tab[NFC_SOCKPROTO_MAX];
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static int nfc_sock_create(struct net *net, struct socket *sock, int proto,
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int kern)
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{
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int rc = -EPROTONOSUPPORT;
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if (net != &init_net)
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return -EAFNOSUPPORT;
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if (proto < 0 || proto >= NFC_SOCKPROTO_MAX)
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return -EINVAL;
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read_lock(&proto_tab_lock);
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if (proto_tab[proto] && try_module_get(proto_tab[proto]->owner)) {
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rc = proto_tab[proto]->create(net, sock, proto_tab[proto], kern);
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module_put(proto_tab[proto]->owner);
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}
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read_unlock(&proto_tab_lock);
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return rc;
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}
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static struct net_proto_family nfc_sock_family_ops = {
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.owner = THIS_MODULE,
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.family = PF_NFC,
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.create = nfc_sock_create,
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};
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int nfc_proto_register(const struct nfc_protocol *nfc_proto)
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{
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int rc;
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if (nfc_proto->id < 0 || nfc_proto->id >= NFC_SOCKPROTO_MAX)
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return -EINVAL;
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rc = proto_register(nfc_proto->proto, 0);
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if (rc)
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return rc;
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write_lock(&proto_tab_lock);
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if (proto_tab[nfc_proto->id])
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rc = -EBUSY;
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else
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proto_tab[nfc_proto->id] = nfc_proto;
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write_unlock(&proto_tab_lock);
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return rc;
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}
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EXPORT_SYMBOL(nfc_proto_register);
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void nfc_proto_unregister(const struct nfc_protocol *nfc_proto)
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{
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write_lock(&proto_tab_lock);
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proto_tab[nfc_proto->id] = NULL;
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write_unlock(&proto_tab_lock);
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proto_unregister(nfc_proto->proto);
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}
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EXPORT_SYMBOL(nfc_proto_unregister);
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int __init af_nfc_init(void)
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{
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return sock_register(&nfc_sock_family_ops);
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}
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void af_nfc_exit(void)
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{
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sock_unregister(PF_NFC);
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}
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