58050fce35
Using NLMSG_GOODSIZE results in multiple pages being used as nlmsg_new() will automatically add the size of the netlink header to the payload thus exceeding the page limit. NLMSG_DEFAULT_SIZE takes this into account. Signed-off-by: Thomas Graf <tgraf@suug.ch> Cc: Jiri Pirko <jpirko@redhat.com> Cc: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com> Cc: Sergey Lapin <slapin@ossfans.org> Cc: Johannes Berg <johannes@sipsolutions.net> Cc: Lauro Ramos Venancio <lauro.venancio@openbossa.org> Cc: Aloisio Almeida Jr <aloisio.almeida@openbossa.org> Cc: Samuel Ortiz <sameo@linux.intel.com> Reviewed-by: Jiri Pirko <jpirko@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
139 lines
3 KiB
C
139 lines
3 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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/* XXX: nlh is right at the start of msg */
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void *hdr = genlmsg_data(NLMSG_DATA(msg->data));
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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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/* XXX: nlh is right at the start of msg */
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void *hdr = genlmsg_data(NLMSG_DATA(msg->data));
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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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int __init ieee802154_nl_init(void)
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{
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int rc;
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rc = genl_register_family(&nl802154_family);
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if (rc)
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goto fail;
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rc = nl802154_mac_register();
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if (rc)
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goto fail;
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rc = nl802154_phy_register();
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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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