net/ieee802154/nl-phy.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 <linux/slab.h>
  27 #include <net/netlink.h>
  28 #include <net/genetlink.h>
  29 #include <net/wpan-phy.h>
  30 #include <net/af_ieee802154.h>
  31 #include <net/ieee802154_netdev.h>
  32 #include <net/rtnetlink.h> /* for rtnl_{un,}lock */
  33 #include <linux/nl802154.h>
  34
  35 #include "ieee802154.h"
  36
  37 static int ieee802154_nl_fill_phy(struct sk_buff *msg, u32 pid,
  38         u32 seq, int flags, struct wpan_phy *phy)
  39 {
  40         void *hdr;
  41         int i, pages = 0;
  42         uint32_t *buf = kzalloc(32 * sizeof(uint32_t), GFP_KERNEL);
  43
  44         pr_debug("%s\n", __func__);
  45
  46         if (!buf)
  47                 return -EMSGSIZE;
  48
  49         hdr = genlmsg_put(msg, 0, seq, &nl802154_family, flags,
  50                 IEEE802154_LIST_PHY);
  51         if (!hdr)
  52                 goto out;
  53
  54         mutex_lock(&phy->pib_lock);
  55         NLA_PUT_STRING(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy));
  56
  57         NLA_PUT_U8(msg, IEEE802154_ATTR_PAGE, phy->current_page);
  58         NLA_PUT_U8(msg, IEEE802154_ATTR_CHANNEL, phy->current_channel);
  59         for (i = 0; i < 32; i++) {
  60                 if (phy->channels_supported[i])
  61                         buf[pages++] = phy->channels_supported[i] | (i << 27);
  62         }
  63         if (pages)
  64                 NLA_PUT(msg, IEEE802154_ATTR_CHANNEL_PAGE_LIST,
  65                                 pages * sizeof(uint32_t), buf);
  66
  67         mutex_unlock(&phy->pib_lock);
  68         kfree(buf);
  69         return genlmsg_end(msg, hdr);
  70
  71 nla_put_failure:
  72         mutex_unlock(&phy->pib_lock);
  73         genlmsg_cancel(msg, hdr);
  74 out:
  75         kfree(buf);
  76         return -EMSGSIZE;
  77 }
  78
  79 static int ieee802154_list_phy(struct sk_buff *skb,
  80         struct genl_info *info)
  81 {
  82         /* Request for interface name, index, type, IEEE address,
  83            PAN Id, short address */
  84         struct sk_buff *msg;
  85         struct wpan_phy *phy;
  86         const char *name;
  87         int rc = -ENOBUFS;
  88
  89         pr_debug("%s\n", __func__);
  90
  91         if (!info->attrs[IEEE802154_ATTR_PHY_NAME])
  92                 return -EINVAL;
  93
  94         name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
  95         if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0')
  96                 return -EINVAL; /* phy name should be null-terminated */
  97
  98
  99         phy = wpan_phy_find(name);
 100         if (!phy)
 101                 return -ENODEV;
 102
 103         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 104         if (!msg)
 105                 goto out_dev;
 106
 107         rc = ieee802154_nl_fill_phy(msg, info->snd_pid, info->snd_seq,
 108                         0, phy);
 109         if (rc < 0)
 110                 goto out_free;
 111
 112         wpan_phy_put(phy);
 113
 114         return genlmsg_reply(msg, info);
 115 out_free:
 116         nlmsg_free(msg);
 117 out_dev:
 118         wpan_phy_put(phy);
 119         return rc;
 120
 121 }
 122
 123 struct dump_phy_data {
 124         struct sk_buff *skb;
 125         struct netlink_callback *cb;
 126         int idx, s_idx;
 127 };
 128
 129 static int ieee802154_dump_phy_iter(struct wpan_phy *phy, void *_data)
 130 {
 131         int rc;
 132         struct dump_phy_data *data = _data;
 133
 134         pr_debug("%s\n", __func__);
 135
 136         if (data->idx++ < data->s_idx)
 137                 return 0;
 138
 139         rc = ieee802154_nl_fill_phy(data->skb,
 140                         NETLINK_CB(data->cb->skb).pid,
 141                         data->cb->nlh->nlmsg_seq,
 142                         NLM_F_MULTI,
 143                         phy);
 144
 145         if (rc < 0) {
 146                 data->idx--;
 147                 return rc;
 148         }
 149
 150         return 0;
 151 }
 152
 153 static int ieee802154_dump_phy(struct sk_buff *skb,
 154         struct netlink_callback *cb)
 155 {
 156         struct dump_phy_data data = {
 157                 .cb = cb,
 158                 .skb = skb,
 159                 .s_idx = cb->args[0],
 160                 .idx = 0,
 161         };
 162
 163         pr_debug("%s\n", __func__);
 164
 165         wpan_phy_for_each(ieee802154_dump_phy_iter, &data);
 166
 167         cb->args[0] = data.idx;
 168
 169         return skb->len;
 170 }
 171
 172 static int ieee802154_add_iface(struct sk_buff *skb,
 173                 struct genl_info *info)
 174 {
 175         struct sk_buff *msg;
 176         struct wpan_phy *phy;
 177         const char *name;
 178         const char *devname;
 179         int rc = -ENOBUFS;
 180         struct net_device *dev;
 181
 182         pr_debug("%s\n", __func__);
 183
 184         if (!info->attrs[IEEE802154_ATTR_PHY_NAME])
 185                 return -EINVAL;
 186
 187         name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
 188         if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0')
 189                 return -EINVAL; /* phy name should be null-terminated */
 190
 191         if (info->attrs[IEEE802154_ATTR_DEV_NAME]) {
 192                 devname = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]);
 193                 if (devname[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1]
 194                                 != '\0')
 195                         return -EINVAL; /* phy name should be null-terminated */
 196         } else  {
 197                 devname = "wpan%d";
 198         }
 199
 200         if (strlen(devname) >= IFNAMSIZ)
 201                 return -ENAMETOOLONG;
 202
 203         phy = wpan_phy_find(name);
 204         if (!phy)
 205                 return -ENODEV;
 206
 207         msg = ieee802154_nl_new_reply(info, 0, IEEE802154_ADD_IFACE);
 208         if (!msg)
 209                 goto out_dev;
 210
 211         if (!phy->add_iface) {
 212                 rc = -EINVAL;
 213                 goto nla_put_failure;
 214         }
 215
 216         dev = phy->add_iface(phy, devname);
 217         if (IS_ERR(dev)) {
 218                 rc = PTR_ERR(dev);
 219                 goto nla_put_failure;
 220         }
 221
 222         NLA_PUT_STRING(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy));
 223         NLA_PUT_STRING(msg, IEEE802154_ATTR_DEV_NAME, dev->name);
 224
 225         dev_put(dev);
 226
 227         wpan_phy_put(phy);
 228
 229         return ieee802154_nl_reply(msg, info);
 230
 231 nla_put_failure:
 232         nlmsg_free(msg);
 233 out_dev:
 234         wpan_phy_put(phy);
 235         return rc;
 236 }
 237
 238 static int ieee802154_del_iface(struct sk_buff *skb,
 239                 struct genl_info *info)
 240 {
 241         struct sk_buff *msg;
 242         struct wpan_phy *phy;
 243         const char *name;
 244         int rc;
 245         struct net_device *dev;
 246
 247         pr_debug("%s\n", __func__);
 248
 249         if (!info->attrs[IEEE802154_ATTR_DEV_NAME])
 250                 return -EINVAL;
 251
 252         name = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]);
 253         if (name[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1] != '\0')
 254                 return -EINVAL; /* name should be null-terminated */
 255
 256         dev = dev_get_by_name(genl_info_net(info), name);
 257         if (!dev)
 258                 return -ENODEV;
 259
 260         phy = ieee802154_mlme_ops(dev)->get_phy(dev);
 261         BUG_ON(!phy);
 262
 263         rc = -EINVAL;
 264         /* phy name is optional, but should be checked if it's given */
 265         if (info->attrs[IEEE802154_ATTR_PHY_NAME]) {
 266                 struct wpan_phy *phy2;
 267
 268                 const char *pname =
 269                         nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
 270                 if (pname[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1]
 271                                 != '\0')
 272                         /* name should be null-terminated */
 273                         goto out_dev;
 274
 275                 phy2 = wpan_phy_find(pname);
 276                 if (!phy2)
 277                         goto out_dev;
 278
 279                 if (phy != phy2) {
 280                         wpan_phy_put(phy2);
 281                         goto out_dev;
 282                 }
 283         }
 284
 285         rc = -ENOBUFS;
 286
 287         msg = ieee802154_nl_new_reply(info, 0, IEEE802154_DEL_IFACE);
 288         if (!msg)
 289                 goto out_dev;
 290
 291         if (!phy->del_iface) {
 292                 rc = -EINVAL;
 293                 goto nla_put_failure;
 294         }
 295
 296         rtnl_lock();
 297         phy->del_iface(phy, dev);
 298
 299         /* We don't have device anymore */
 300         dev_put(dev);
 301         dev = NULL;
 302
 303         rtnl_unlock();
 304
 305
 306         NLA_PUT_STRING(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy));
 307         NLA_PUT_STRING(msg, IEEE802154_ATTR_DEV_NAME, name);
 308
 309         wpan_phy_put(phy);
 310
 311         return ieee802154_nl_reply(msg, info);
 312
 313 nla_put_failure:
 314         nlmsg_free(msg);
 315 out_dev:
 316         wpan_phy_put(phy);
 317         if (dev)
 318                 dev_put(dev);
 319
 320         return rc;
 321 }
 322
 323 static struct genl_ops ieee802154_phy_ops[] = {
 324         IEEE802154_DUMP(IEEE802154_LIST_PHY, ieee802154_list_phy,
 325                                                         ieee802154_dump_phy),
 326         IEEE802154_OP(IEEE802154_ADD_IFACE, ieee802154_add_iface),
 327         IEEE802154_OP(IEEE802154_DEL_IFACE, ieee802154_del_iface),
 328 };
 329
 330 /*
 331  * No need to unregister as family unregistration will do it.
 332  */
 333 int nl802154_phy_register(void)
 334 {
 335         int i;
 336         int rc;
 337
 338         for (i = 0; i < ARRAY_SIZE(ieee802154_phy_ops); i++) {
 339                 rc = genl_register_ops(&nl802154_family,
 340                                 &ieee802154_phy_ops[i]);
 341                 if (rc)
 342                         return rc;
 343         }
 344
 345         return 0;
 346 }