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 <linux/if_arp.h>
  28 #include <net/netlink.h>
  29 #include <net/genetlink.h>
  30 #include <net/wpan-phy.h>
  31 #include <net/af_ieee802154.h>
  32 #include <net/ieee802154_netdev.h>
  33 #include <net/rtnetlink.h> /* for rtnl_{un,}lock */
  34 #include <linux/nl802154.h>
  35
  36 #include "ieee802154.h"
  37
  38 static int ieee802154_nl_fill_phy(struct sk_buff *msg, u32 portid,
  39         u32 seq, int flags, struct wpan_phy *phy)
  40 {
  41         void *hdr;
  42         int i, pages = 0;
  43         uint32_t *buf = kzalloc(32 * sizeof(uint32_t), GFP_KERNEL);
  44
  45         pr_debug("%s\n", __func__);
  46
  47         if (!buf)
  48                 return -EMSGSIZE;
  49
  50         hdr = genlmsg_put(msg, 0, seq, &nl802154_family, flags,
  51                 IEEE802154_LIST_PHY);
  52         if (!hdr)
  53                 goto out;
  54
  55         mutex_lock(&phy->pib_lock);
  56         if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) ||
  57             nla_put_u8(msg, IEEE802154_ATTR_PAGE, phy->current_page) ||
  58             nla_put_u8(msg, IEEE802154_ATTR_CHANNEL, phy->current_channel))
  59                 goto nla_put_failure;
  60         for (i = 0; i < 32; i++) {
  61                 if (phy->channels_supported[i])
  62                         buf[pages++] = phy->channels_supported[i] | (i << 27);
  63         }
  64         if (pages &&
  65             nla_put(msg, IEEE802154_ATTR_CHANNEL_PAGE_LIST,
  66                     pages * sizeof(uint32_t), buf))
  67                 goto nla_put_failure;
  68         mutex_unlock(&phy->pib_lock);
  69         kfree(buf);
  70         return genlmsg_end(msg, hdr);
  71
  72 nla_put_failure:
  73         mutex_unlock(&phy->pib_lock);
  74         genlmsg_cancel(msg, hdr);
  75 out:
  76         kfree(buf);
  77         return -EMSGSIZE;
  78 }
  79
  80 static int ieee802154_list_phy(struct sk_buff *skb,
  81         struct genl_info *info)
  82 {
  83         /* Request for interface name, index, type, IEEE address,
  84            PAN Id, short address */
  85         struct sk_buff *msg;
  86         struct wpan_phy *phy;
  87         const char *name;
  88         int rc = -ENOBUFS;
  89
  90         pr_debug("%s\n", __func__);
  91
  92         if (!info->attrs[IEEE802154_ATTR_PHY_NAME])
  93                 return -EINVAL;
  94
  95         name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
  96         if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0')
  97                 return -EINVAL; /* phy name should be null-terminated */
  98
  99
 100         phy = wpan_phy_find(name);
 101         if (!phy)
 102                 return -ENODEV;
 103
 104         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 105         if (!msg)
 106                 goto out_dev;
 107
 108         rc = ieee802154_nl_fill_phy(msg, info->snd_portid, info->snd_seq,
 109                         0, phy);
 110         if (rc < 0)
 111                 goto out_free;
 112
 113         wpan_phy_put(phy);
 114
 115         return genlmsg_reply(msg, info);
 116 out_free:
 117         nlmsg_free(msg);
 118 out_dev:
 119         wpan_phy_put(phy);
 120         return rc;
 121
 122 }
 123
 124 struct dump_phy_data {
 125         struct sk_buff *skb;
 126         struct netlink_callback *cb;
 127         int idx, s_idx;
 128 };
 129
 130 static int ieee802154_dump_phy_iter(struct wpan_phy *phy, void *_data)
 131 {
 132         int rc;
 133         struct dump_phy_data *data = _data;
 134
 135         pr_debug("%s\n", __func__);
 136
 137         if (data->idx++ < data->s_idx)
 138                 return 0;
 139
 140         rc = ieee802154_nl_fill_phy(data->skb,
 141                         NETLINK_CB(data->cb->skb).portid,
 142                         data->cb->nlh->nlmsg_seq,
 143                         NLM_F_MULTI,
 144                         phy);
 145
 146         if (rc < 0) {
 147                 data->idx--;
 148                 return rc;
 149         }
 150
 151         return 0;
 152 }
 153
 154 static int ieee802154_dump_phy(struct sk_buff *skb,
 155         struct netlink_callback *cb)
 156 {
 157         struct dump_phy_data data = {
 158                 .cb = cb,
 159                 .skb = skb,
 160                 .s_idx = cb->args[0],
 161                 .idx = 0,
 162         };
 163
 164         pr_debug("%s\n", __func__);
 165
 166         wpan_phy_for_each(ieee802154_dump_phy_iter, &data);
 167
 168         cb->args[0] = data.idx;
 169
 170         return skb->len;
 171 }
 172
 173 static int ieee802154_add_iface(struct sk_buff *skb,
 174                 struct genl_info *info)
 175 {
 176         struct sk_buff *msg;
 177         struct wpan_phy *phy;
 178         const char *name;
 179         const char *devname;
 180         int rc = -ENOBUFS;
 181         struct net_device *dev;
 182         int type = __IEEE802154_DEV_INVALID;
 183
 184         pr_debug("%s\n", __func__);
 185
 186         if (!info->attrs[IEEE802154_ATTR_PHY_NAME])
 187                 return -EINVAL;
 188
 189         name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
 190         if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0')
 191                 return -EINVAL; /* phy name should be null-terminated */
 192
 193         if (info->attrs[IEEE802154_ATTR_DEV_NAME]) {
 194                 devname = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]);
 195                 if (devname[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1]
 196                                 != '\0')
 197                         return -EINVAL; /* phy name should be null-terminated */
 198         } else  {
 199                 devname = "wpan%d";
 200         }
 201
 202         if (strlen(devname) >= IFNAMSIZ)
 203                 return -ENAMETOOLONG;
 204
 205         phy = wpan_phy_find(name);
 206         if (!phy)
 207                 return -ENODEV;
 208
 209         msg = ieee802154_nl_new_reply(info, 0, IEEE802154_ADD_IFACE);
 210         if (!msg)
 211                 goto out_dev;
 212
 213         if (!phy->add_iface) {
 214                 rc = -EINVAL;
 215                 goto nla_put_failure;
 216         }
 217
 218         if (info->attrs[IEEE802154_ATTR_HW_ADDR] &&
 219             nla_len(info->attrs[IEEE802154_ATTR_HW_ADDR]) !=
 220                         IEEE802154_ADDR_LEN) {
 221                 rc = -EINVAL;
 222                 goto nla_put_failure;
 223         }
 224
 225         if (info->attrs[IEEE802154_ATTR_DEV_TYPE]) {
 226                 type = nla_get_u8(info->attrs[IEEE802154_ATTR_DEV_TYPE]);
 227                 if (type >= __IEEE802154_DEV_MAX)
 228                         return -EINVAL;
 229         }
 230
 231         dev = phy->add_iface(phy, devname, type);
 232         if (IS_ERR(dev)) {
 233                 rc = PTR_ERR(dev);
 234                 goto nla_put_failure;
 235         }
 236
 237         if (info->attrs[IEEE802154_ATTR_HW_ADDR]) {
 238                 struct sockaddr addr;
 239
 240                 addr.sa_family = ARPHRD_IEEE802154;
 241                 nla_memcpy(&addr.sa_data, info->attrs[IEEE802154_ATTR_HW_ADDR],
 242                                 IEEE802154_ADDR_LEN);
 243
 244                 /*
 245                  * strangely enough, some callbacks (inetdev_event) from
 246                  * dev_set_mac_address require RTNL_LOCK
 247                  */
 248                 rtnl_lock();
 249                 rc = dev_set_mac_address(dev, &addr);
 250                 rtnl_unlock();
 251                 if (rc)
 252                         goto dev_unregister;
 253         }
 254
 255         if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) ||
 256             nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, dev->name))
 257                 goto nla_put_failure;
 258         dev_put(dev);
 259
 260         wpan_phy_put(phy);
 261
 262         return ieee802154_nl_reply(msg, info);
 263
 264 dev_unregister:
 265         rtnl_lock(); /* del_iface must be called with RTNL lock */
 266         phy->del_iface(phy, dev);
 267         dev_put(dev);
 268         rtnl_unlock();
 269 nla_put_failure:
 270         nlmsg_free(msg);
 271 out_dev:
 272         wpan_phy_put(phy);
 273         return rc;
 274 }
 275
 276 static int ieee802154_del_iface(struct sk_buff *skb,
 277                 struct genl_info *info)
 278 {
 279         struct sk_buff *msg;
 280         struct wpan_phy *phy;
 281         const char *name;
 282         int rc;
 283         struct net_device *dev;
 284
 285         pr_debug("%s\n", __func__);
 286
 287         if (!info->attrs[IEEE802154_ATTR_DEV_NAME])
 288                 return -EINVAL;
 289
 290         name = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]);
 291         if (name[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1] != '\0')
 292                 return -EINVAL; /* name should be null-terminated */
 293
 294         dev = dev_get_by_name(genl_info_net(info), name);
 295         if (!dev)
 296                 return -ENODEV;
 297
 298         phy = ieee802154_mlme_ops(dev)->get_phy(dev);
 299         BUG_ON(!phy);
 300
 301         rc = -EINVAL;
 302         /* phy name is optional, but should be checked if it's given */
 303         if (info->attrs[IEEE802154_ATTR_PHY_NAME]) {
 304                 struct wpan_phy *phy2;
 305
 306                 const char *pname =
 307                         nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
 308                 if (pname[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1]
 309                                 != '\0')
 310                         /* name should be null-terminated */
 311                         goto out_dev;
 312
 313                 phy2 = wpan_phy_find(pname);
 314                 if (!phy2)
 315                         goto out_dev;
 316
 317                 if (phy != phy2) {
 318                         wpan_phy_put(phy2);
 319                         goto out_dev;
 320                 }
 321         }
 322
 323         rc = -ENOBUFS;
 324
 325         msg = ieee802154_nl_new_reply(info, 0, IEEE802154_DEL_IFACE);
 326         if (!msg)
 327                 goto out_dev;
 328
 329         if (!phy->del_iface) {
 330                 rc = -EINVAL;
 331                 goto nla_put_failure;
 332         }
 333
 334         rtnl_lock();
 335         phy->del_iface(phy, dev);
 336
 337         /* We don't have device anymore */
 338         dev_put(dev);
 339         dev = NULL;
 340
 341         rtnl_unlock();
 342
 343         if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) ||
 344             nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, name))
 345                 goto nla_put_failure;
 346         wpan_phy_put(phy);
 347
 348         return ieee802154_nl_reply(msg, info);
 349
 350 nla_put_failure:
 351         nlmsg_free(msg);
 352 out_dev:
 353         wpan_phy_put(phy);
 354         if (dev)
 355                 dev_put(dev);
 356
 357         return rc;
 358 }
 359
 360 static struct genl_ops ieee802154_phy_ops[] = {
 361         IEEE802154_DUMP(IEEE802154_LIST_PHY, ieee802154_list_phy,
 362                                                         ieee802154_dump_phy),
 363         IEEE802154_OP(IEEE802154_ADD_IFACE, ieee802154_add_iface),
 364         IEEE802154_OP(IEEE802154_DEL_IFACE, ieee802154_del_iface),
 365 };
 366
 367 /*
 368  * No need to unregister as family unregistration will do it.
 369  */
 370 int nl802154_phy_register(void)
 371 {
 372         int i;
 373         int rc;
 374
 375         for (i = 0; i < ARRAY_SIZE(ieee802154_phy_ops); i++) {
 376                 rc = genl_register_ops(&nl802154_family,
 377                                 &ieee802154_phy_ops[i]);
 378                 if (rc)
 379                         return rc;
 380         }
 381
 382         return 0;
 383 }