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 pid,
  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         NLA_PUT_STRING(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy));
  57
  58         NLA_PUT_U8(msg, IEEE802154_ATTR_PAGE, phy->current_page);
  59         NLA_PUT_U8(msg, IEEE802154_ATTR_CHANNEL, phy->current_channel);
  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
  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_GOODSIZE, GFP_KERNEL);
 105         if (!msg)
 106                 goto out_dev;
 107
 108         rc = ieee802154_nl_fill_phy(msg, info->snd_pid, 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).pid,
 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
 183         pr_debug("%s\n", __func__);
 184
 185         if (!info->attrs[IEEE802154_ATTR_PHY_NAME])
 186                 return -EINVAL;
 187
 188         name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
 189         if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0')
 190                 return -EINVAL; /* phy name should be null-terminated */
 191
 192         if (info->attrs[IEEE802154_ATTR_DEV_NAME]) {
 193                 devname = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]);
 194                 if (devname[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1]
 195                                 != '\0')
 196                         return -EINVAL; /* phy name should be null-terminated */
 197         } else  {
 198                 devname = "wpan%d";
 199         }
 200
 201         if (strlen(devname) >= IFNAMSIZ)
 202                 return -ENAMETOOLONG;
 203
 204         phy = wpan_phy_find(name);
 205         if (!phy)
 206                 return -ENODEV;
 207
 208         msg = ieee802154_nl_new_reply(info, 0, IEEE802154_ADD_IFACE);
 209         if (!msg)
 210                 goto out_dev;
 211
 212         if (!phy->add_iface) {
 213                 rc = -EINVAL;
 214                 goto nla_put_failure;
 215         }
 216
 217         if (info->attrs[IEEE802154_ATTR_HW_ADDR] &&
 218             nla_len(info->attrs[IEEE802154_ATTR_HW_ADDR]) !=
 219                         IEEE802154_ADDR_LEN) {
 220                 rc = -EINVAL;
 221                 goto nla_put_failure;
 222         }
 223
 224         dev = phy->add_iface(phy, devname);
 225         if (IS_ERR(dev)) {
 226                 rc = PTR_ERR(dev);
 227                 goto nla_put_failure;
 228         }
 229
 230         if (info->attrs[IEEE802154_ATTR_HW_ADDR]) {
 231                 struct sockaddr addr;
 232
 233                 addr.sa_family = ARPHRD_IEEE802154;
 234                 nla_memcpy(&addr.sa_data, info->attrs[IEEE802154_ATTR_HW_ADDR],
 235                                 IEEE802154_ADDR_LEN);
 236
 237                 /*
 238                  * strangely enough, some callbacks (inetdev_event) from
 239                  * dev_set_mac_address require RTNL_LOCK
 240                  */
 241                 rtnl_lock();
 242                 rc = dev_set_mac_address(dev, &addr);
 243                 rtnl_unlock();
 244                 if (rc)
 245                         goto dev_unregister;
 246         }
 247
 248         NLA_PUT_STRING(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy));
 249         NLA_PUT_STRING(msg, IEEE802154_ATTR_DEV_NAME, dev->name);
 250
 251         dev_put(dev);
 252
 253         wpan_phy_put(phy);
 254
 255         return ieee802154_nl_reply(msg, info);
 256
 257 dev_unregister:
 258         rtnl_lock(); /* del_iface must be called with RTNL lock */
 259         phy->del_iface(phy, dev);
 260         dev_put(dev);
 261         rtnl_unlock();
 262 nla_put_failure:
 263         nlmsg_free(msg);
 264 out_dev:
 265         wpan_phy_put(phy);
 266         return rc;
 267 }
 268
 269 static int ieee802154_del_iface(struct sk_buff *skb,
 270                 struct genl_info *info)
 271 {
 272         struct sk_buff *msg;
 273         struct wpan_phy *phy;
 274         const char *name;
 275         int rc;
 276         struct net_device *dev;
 277
 278         pr_debug("%s\n", __func__);
 279
 280         if (!info->attrs[IEEE802154_ATTR_DEV_NAME])
 281                 return -EINVAL;
 282
 283         name = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]);
 284         if (name[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1] != '\0')
 285                 return -EINVAL; /* name should be null-terminated */
 286
 287         dev = dev_get_by_name(genl_info_net(info), name);
 288         if (!dev)
 289                 return -ENODEV;
 290
 291         phy = ieee802154_mlme_ops(dev)->get_phy(dev);
 292         BUG_ON(!phy);
 293
 294         rc = -EINVAL;
 295         /* phy name is optional, but should be checked if it's given */
 296         if (info->attrs[IEEE802154_ATTR_PHY_NAME]) {
 297                 struct wpan_phy *phy2;
 298
 299                 const char *pname =
 300                         nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
 301                 if (pname[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1]
 302                                 != '\0')
 303                         /* name should be null-terminated */
 304                         goto out_dev;
 305
 306                 phy2 = wpan_phy_find(pname);
 307                 if (!phy2)
 308                         goto out_dev;
 309
 310                 if (phy != phy2) {
 311                         wpan_phy_put(phy2);
 312                         goto out_dev;
 313                 }
 314         }
 315
 316         rc = -ENOBUFS;
 317
 318         msg = ieee802154_nl_new_reply(info, 0, IEEE802154_DEL_IFACE);
 319         if (!msg)
 320                 goto out_dev;
 321
 322         if (!phy->del_iface) {
 323                 rc = -EINVAL;
 324                 goto nla_put_failure;
 325         }
 326
 327         rtnl_lock();
 328         phy->del_iface(phy, dev);
 329
 330         /* We don't have device anymore */
 331         dev_put(dev);
 332         dev = NULL;
 333
 334         rtnl_unlock();
 335
 336
 337         NLA_PUT_STRING(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy));
 338         NLA_PUT_STRING(msg, IEEE802154_ATTR_DEV_NAME, name);
 339
 340         wpan_phy_put(phy);
 341
 342         return ieee802154_nl_reply(msg, info);
 343
 344 nla_put_failure:
 345         nlmsg_free(msg);
 346 out_dev:
 347         wpan_phy_put(phy);
 348         if (dev)
 349                 dev_put(dev);
 350
 351         return rc;
 352 }
 353
 354 static struct genl_ops ieee802154_phy_ops[] = {
 355         IEEE802154_DUMP(IEEE802154_LIST_PHY, ieee802154_list_phy,
 356                                                         ieee802154_dump_phy),
 357         IEEE802154_OP(IEEE802154_ADD_IFACE, ieee802154_add_iface),
 358         IEEE802154_OP(IEEE802154_DEL_IFACE, ieee802154_del_iface),
 359 };
 360
 361 /*
 362  * No need to unregister as family unregistration will do it.
 363  */
 364 int nl802154_phy_register(void)
 365 {
 366         int i;
 367         int rc;
 368
 369         for (i = 0; i < ARRAY_SIZE(ieee802154_phy_ops); i++) {
 370                 rc = genl_register_ops(&nl802154_family,
 371                                 &ieee802154_phy_ops[i]);
 372                 if (rc)
 373                         return rc;
 374         }
 375
 376         return 0;
 377 }