net/ieee802154/netlink.c

   1 /*
   2  * Netlink inteface for IEEE 802.15.4 stack
   3  *
   4  * Copyright 2007, 2008 Siemens AG
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Written by:
  20  * Sergey Lapin <slapin@ossfans.org>
  21  * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
  22  * Maxim Osipov <maxim.osipov@siemens.com>
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <net/genetlink.h>
  27 #include <linux/nl802154.h>
  28
  29 #include "ieee802154.h"
  30
  31 static unsigned int ieee802154_seq_num;
  32 static DEFINE_SPINLOCK(ieee802154_seq_lock);
  33
  34 struct genl_family nl802154_family = {
  35         .id             = GENL_ID_GENERATE,
  36         .hdrsize        = 0,
  37         .name           = IEEE802154_NL_NAME,
  38         .version        = 1,
  39         .maxattr        = IEEE802154_ATTR_MAX,
  40 };
  41
  42 /* Requests to userspace */
  43 struct sk_buff *ieee802154_nl_create(int flags, u8 req)
  44 {
  45         void *hdr;
  46         struct sk_buff *msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
  47         unsigned long f;
  48
  49         if (!msg)
  50                 return NULL;
  51
  52         spin_lock_irqsave(&ieee802154_seq_lock, f);
  53         hdr = genlmsg_put(msg, 0, ieee802154_seq_num++,
  54                         &nl802154_family, flags, req);
  55         spin_unlock_irqrestore(&ieee802154_seq_lock, f);
  56         if (!hdr) {
  57                 nlmsg_free(msg);
  58                 return NULL;
  59         }
  60
  61         return msg;
  62 }
  63
  64 int ieee802154_nl_mcast(struct sk_buff *msg, unsigned int group)
  65 {
  66         /* XXX: nlh is right at the start of msg */
  67         void *hdr = genlmsg_data(NLMSG_DATA(msg->data));
  68
  69         if (genlmsg_end(msg, hdr) < 0)
  70                 goto out;
  71
  72         return genlmsg_multicast(msg, 0, group, GFP_ATOMIC);
  73 out:
  74         nlmsg_free(msg);
  75         return -ENOBUFS;
  76 }
  77
  78 struct sk_buff *ieee802154_nl_new_reply(struct genl_info *info,
  79                 int flags, u8 req)
  80 {
  81         void *hdr;
  82         struct sk_buff *msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
  83
  84         if (!msg)
  85                 return NULL;
  86
  87         hdr = genlmsg_put_reply(msg, info,
  88                         &nl802154_family, flags, req);
  89         if (!hdr) {
  90                 nlmsg_free(msg);
  91                 return NULL;
  92         }
  93
  94         return msg;
  95 }
  96
  97 int ieee802154_nl_reply(struct sk_buff *msg, struct genl_info *info)
  98 {
  99         /* XXX: nlh is right at the start of msg */
 100         void *hdr = genlmsg_data(NLMSG_DATA(msg->data));
 101
 102         if (genlmsg_end(msg, hdr) < 0)
 103                 goto out;
 104
 105         return genlmsg_reply(msg, info);
 106 out:
 107         nlmsg_free(msg);
 108         return -ENOBUFS;
 109 }
 110
 111 int __init ieee802154_nl_init(void)
 112 {
 113         int rc;
 114
 115         rc = genl_register_family(&nl802154_family);
 116         if (rc)
 117                 goto fail;
 118
 119         rc = nl802154_mac_register();
 120         if (rc)
 121                 goto fail;
 122
 123         rc = nl802154_phy_register();
 124         if (rc)
 125                 goto fail;
 126
 127         return 0;
 128
 129 fail:
 130         genl_unregister_family(&nl802154_family);
 131         return rc;
 132 }
 133
 134 void __exit ieee802154_nl_exit(void)
 135 {
 136         genl_unregister_family(&nl802154_family);
 137 }
 138