netlink.c
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/*
* Netlink inteface for IEEE 802.15.4 stack
*
* Copyright 2007, 2008 Siemens AG
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Written by:
* Sergey Lapin <slapin@ossfans.org>
* Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
* Maxim Osipov <maxim.osipov@siemens.com>
*/
#include <linux/kernel.h>
#include <linux/gfp.h>
#include <net/genetlink.h>
#include <linux/nl802154.h>
#include "ieee802154.h"
static unsigned int ieee802154_seq_num;
static DEFINE_SPINLOCK(ieee802154_seq_lock);
struct genl_family nl802154_family = {
.id = GENL_ID_GENERATE,
.hdrsize = 0,
.name = IEEE802154_NL_NAME,
.version = 1,
.maxattr = IEEE802154_ATTR_MAX,
};
/* Requests to userspace */
struct sk_buff *ieee802154_nl_create(int flags, u8 req)
{
void *hdr;
struct sk_buff *msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
unsigned long f;
if (!msg)
return NULL;
spin_lock_irqsave(&ieee802154_seq_lock, f);
hdr = genlmsg_put(msg, 0, ieee802154_seq_num++,
&nl802154_family, flags, req);
spin_unlock_irqrestore(&ieee802154_seq_lock, f);
if (!hdr) {
nlmsg_free(msg);
return NULL;
}
return msg;
}
int ieee802154_nl_mcast(struct sk_buff *msg, unsigned int group)
{
struct nlmsghdr *nlh = nlmsg_hdr(msg);
void *hdr = genlmsg_data(nlmsg_data(nlh));
if (genlmsg_end(msg, hdr) < 0)
goto out;
return genlmsg_multicast(&nl802154_family, msg, 0, group, GFP_ATOMIC);
out:
nlmsg_free(msg);
return -ENOBUFS;
}
struct sk_buff *ieee802154_nl_new_reply(struct genl_info *info,
int flags, u8 req)
{
void *hdr;
struct sk_buff *msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
if (!msg)
return NULL;
hdr = genlmsg_put_reply(msg, info,
&nl802154_family, flags, req);
if (!hdr) {
nlmsg_free(msg);
return NULL;
}
return msg;
}
int ieee802154_nl_reply(struct sk_buff *msg, struct genl_info *info)
{
struct nlmsghdr *nlh = nlmsg_hdr(msg);
void *hdr = genlmsg_data(nlmsg_data(nlh));
if (genlmsg_end(msg, hdr) < 0)
goto out;
return genlmsg_reply(msg, info);
out:
nlmsg_free(msg);
return -ENOBUFS;
}
static const struct genl_ops ieee8021154_ops[] = {
/* see nl-phy.c */
IEEE802154_DUMP(IEEE802154_LIST_PHY, ieee802154_list_phy,
ieee802154_dump_phy),
IEEE802154_OP(IEEE802154_ADD_IFACE, ieee802154_add_iface),
IEEE802154_OP(IEEE802154_DEL_IFACE, ieee802154_del_iface),
/* see nl-mac.c */
IEEE802154_OP(IEEE802154_ASSOCIATE_REQ, ieee802154_associate_req),
IEEE802154_OP(IEEE802154_ASSOCIATE_RESP, ieee802154_associate_resp),
IEEE802154_OP(IEEE802154_DISASSOCIATE_REQ, ieee802154_disassociate_req),
IEEE802154_OP(IEEE802154_SCAN_REQ, ieee802154_scan_req),
IEEE802154_OP(IEEE802154_START_REQ, ieee802154_start_req),
IEEE802154_DUMP(IEEE802154_LIST_IFACE, ieee802154_list_iface,
ieee802154_dump_iface),
};
static const struct genl_multicast_group ieee802154_mcgrps[] = {
[IEEE802154_COORD_MCGRP] = { .name = IEEE802154_MCAST_COORD_NAME, },
[IEEE802154_BEACON_MCGRP] = { .name = IEEE802154_MCAST_BEACON_NAME, },
};
int __init ieee802154_nl_init(void)
{
return genl_register_family_with_ops_groups(&nl802154_family,
ieee8021154_ops,
ieee802154_mcgrps);
}
void __exit ieee802154_nl_exit(void)
{
genl_unregister_family(&nl802154_family);
}