1c582d915d
This simplifies the code since there's no longer a need to have error handling in the registration. Unfortunately it means more extern function declarations are needed, but the overall goal would seem to justify this. While at it, also fix the registration error path - if the family registration failed then it shouldn't be unregistered. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
154 lines
3.8 KiB
C
154 lines
3.8 KiB
C
/*
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* Netlink inteface for IEEE 802.15.4 stack
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*
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* Copyright 2007, 2008 Siemens AG
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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 version 2
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* as published by the Free Software Foundation.
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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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Written by:
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* Sergey Lapin <slapin@ossfans.org>
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* Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
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* Maxim Osipov <maxim.osipov@siemens.com>
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*/
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#include <linux/kernel.h>
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#include <linux/gfp.h>
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#include <net/genetlink.h>
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#include <linux/nl802154.h>
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#include "ieee802154.h"
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static unsigned int ieee802154_seq_num;
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static DEFINE_SPINLOCK(ieee802154_seq_lock);
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struct genl_family nl802154_family = {
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.id = GENL_ID_GENERATE,
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.hdrsize = 0,
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.name = IEEE802154_NL_NAME,
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.version = 1,
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.maxattr = IEEE802154_ATTR_MAX,
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};
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/* Requests to userspace */
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struct sk_buff *ieee802154_nl_create(int flags, u8 req)
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{
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void *hdr;
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struct sk_buff *msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
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unsigned long f;
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if (!msg)
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return NULL;
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spin_lock_irqsave(&ieee802154_seq_lock, f);
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hdr = genlmsg_put(msg, 0, ieee802154_seq_num++,
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&nl802154_family, flags, req);
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spin_unlock_irqrestore(&ieee802154_seq_lock, f);
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if (!hdr) {
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nlmsg_free(msg);
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return NULL;
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}
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return msg;
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}
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int ieee802154_nl_mcast(struct sk_buff *msg, unsigned int group)
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{
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struct nlmsghdr *nlh = nlmsg_hdr(msg);
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void *hdr = genlmsg_data(nlmsg_data(nlh));
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if (genlmsg_end(msg, hdr) < 0)
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goto out;
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return genlmsg_multicast(msg, 0, group, GFP_ATOMIC);
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out:
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nlmsg_free(msg);
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return -ENOBUFS;
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}
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struct sk_buff *ieee802154_nl_new_reply(struct genl_info *info,
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int flags, u8 req)
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{
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void *hdr;
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struct sk_buff *msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
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if (!msg)
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return NULL;
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hdr = genlmsg_put_reply(msg, info,
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&nl802154_family, flags, req);
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if (!hdr) {
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nlmsg_free(msg);
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return NULL;
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}
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return msg;
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}
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int ieee802154_nl_reply(struct sk_buff *msg, struct genl_info *info)
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{
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struct nlmsghdr *nlh = nlmsg_hdr(msg);
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void *hdr = genlmsg_data(nlmsg_data(nlh));
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if (genlmsg_end(msg, hdr) < 0)
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goto out;
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return genlmsg_reply(msg, info);
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out:
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nlmsg_free(msg);
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return -ENOBUFS;
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}
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static struct genl_ops ieee8021154_ops[] = {
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/* see nl-phy.c */
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IEEE802154_DUMP(IEEE802154_LIST_PHY, ieee802154_list_phy,
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ieee802154_dump_phy),
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IEEE802154_OP(IEEE802154_ADD_IFACE, ieee802154_add_iface),
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IEEE802154_OP(IEEE802154_DEL_IFACE, ieee802154_del_iface),
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/* see nl-mac.c */
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IEEE802154_OP(IEEE802154_ASSOCIATE_REQ, ieee802154_associate_req),
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IEEE802154_OP(IEEE802154_ASSOCIATE_RESP, ieee802154_associate_resp),
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IEEE802154_OP(IEEE802154_DISASSOCIATE_REQ, ieee802154_disassociate_req),
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IEEE802154_OP(IEEE802154_SCAN_REQ, ieee802154_scan_req),
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IEEE802154_OP(IEEE802154_START_REQ, ieee802154_start_req),
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IEEE802154_DUMP(IEEE802154_LIST_IFACE, ieee802154_list_iface,
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ieee802154_dump_iface),
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};
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int __init ieee802154_nl_init(void)
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{
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int rc;
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rc = genl_register_family_with_ops(&nl802154_family, ieee8021154_ops,
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ARRAY_SIZE(ieee8021154_ops));
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if (rc)
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return rc;
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rc = genl_register_mc_group(&nl802154_family, &ieee802154_coord_mcgrp);
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if (rc)
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goto fail;
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rc = genl_register_mc_group(&nl802154_family, &ieee802154_beacon_mcgrp);
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if (rc)
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goto fail;
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return 0;
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fail:
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genl_unregister_family(&nl802154_family);
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return rc;
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}
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void __exit ieee802154_nl_exit(void)
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{
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genl_unregister_family(&nl802154_family);
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}
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