net/ieee802154/nl-phy.c

   1 /*
   2  * Netlink interface 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  * Written by:
  16  * Sergey Lapin <slapin@ossfans.org>
  17  * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
  18  * Maxim Osipov <maxim.osipov@siemens.com>
  19  */
  20
  21 #include <linux/kernel.h>
  22 #include <linux/slab.h>
  23 #include <linux/if_arp.h>
  24 #include <net/netlink.h>
  25 #include <net/genetlink.h>
  26 #include <net/cfg802154.h>
  27 #include <net/af_ieee802154.h>
  28 #include <net/ieee802154_netdev.h>
  29 #include <net/rtnetlink.h> /* for rtnl_{un,}lock */
  30 #include <linux/nl802154.h>
  31
  32 #include "ieee802154.h"
  33 #include "rdev-ops.h"
  34 #include "core.h"
  35
  36 static int ieee802154_nl_fill_phy(struct sk_buff *msg, u32 portid,
  37                                   u32 seq, int flags, struct wpan_phy *phy)
  38 {
  39         void *hdr;
  40         int i, pages = 0;
  41         uint32_t *buf = kzalloc(32 * sizeof(uint32_t), GFP_KERNEL);
  42
  43         pr_debug("%s\n", __func__);
  44
  45         if (!buf)
  46                 return -EMSGSIZE;
  47
  48         hdr = genlmsg_put(msg, 0, seq, &nl802154_family, flags,
  49                           IEEE802154_LIST_PHY);
  50         if (!hdr)
  51                 goto out;
  52
  53         mutex_lock(&phy->pib_lock);
  54         if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) ||
  55             nla_put_u8(msg, IEEE802154_ATTR_PAGE, phy->current_page) ||
  56             nla_put_u8(msg, IEEE802154_ATTR_CHANNEL, phy->current_channel))
  57                 goto nla_put_failure;
  58         for (i = 0; i < 32; i++) {
  59                 if (phy->channels_supported[i])
  60                         buf[pages++] = phy->channels_supported[i] | (i << 27);
  61         }
  62         if (pages &&
  63             nla_put(msg, IEEE802154_ATTR_CHANNEL_PAGE_LIST,
  64                     pages * sizeof(uint32_t), buf))
  65                 goto nla_put_failure;
  66         mutex_unlock(&phy->pib_lock);
  67         kfree(buf);
  68         genlmsg_end(msg, hdr);
  69         return 0;
  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 int ieee802154_list_phy(struct sk_buff *skb, struct genl_info *info)
  80 {
  81         /* Request for interface name, index, type, IEEE address,
  82          * PAN Id, short address
  83          */
  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         phy = wpan_phy_find(name);
  99         if (!phy)
 100                 return -ENODEV;
 101
 102         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 103         if (!msg)
 104                 goto out_dev;
 105
 106         rc = ieee802154_nl_fill_phy(msg, info->snd_portid, info->snd_seq,
 107                                     0, phy);
 108         if (rc < 0)
 109                 goto out_free;
 110
 111         wpan_phy_put(phy);
 112
 113         return genlmsg_reply(msg, info);
 114 out_free:
 115         nlmsg_free(msg);
 116 out_dev:
 117         wpan_phy_put(phy);
 118         return rc;
 119 }
 120
 121 struct dump_phy_data {
 122         struct sk_buff *skb;
 123         struct netlink_callback *cb;
 124         int idx, s_idx;
 125 };
 126
 127 static int ieee802154_dump_phy_iter(struct wpan_phy *phy, void *_data)
 128 {
 129         int rc;
 130         struct dump_phy_data *data = _data;
 131
 132         pr_debug("%s\n", __func__);
 133
 134         if (data->idx++ < data->s_idx)
 135                 return 0;
 136
 137         rc = ieee802154_nl_fill_phy(data->skb,
 138                                     NETLINK_CB(data->cb->skb).portid,
 139                                     data->cb->nlh->nlmsg_seq,
 140                                     NLM_F_MULTI,
 141                                     phy);
 142
 143         if (rc < 0) {
 144                 data->idx--;
 145                 return rc;
 146         }
 147
 148         return 0;
 149 }
 150
 151 int ieee802154_dump_phy(struct sk_buff *skb, struct netlink_callback *cb)
 152 {
 153         struct dump_phy_data data = {
 154                 .cb = cb,
 155                 .skb = skb,
 156                 .s_idx = cb->args[0],
 157                 .idx = 0,
 158         };
 159
 160         pr_debug("%s\n", __func__);
 161
 162         wpan_phy_for_each(ieee802154_dump_phy_iter, &data);
 163
 164         cb->args[0] = data.idx;
 165
 166         return skb->len;
 167 }
 168
 169 int ieee802154_add_iface(struct sk_buff *skb, struct genl_info *info)
 170 {
 171         struct sk_buff *msg;
 172         struct wpan_phy *phy;
 173         const char *name;
 174         const char *devname;
 175         int rc = -ENOBUFS;
 176         struct net_device *dev;
 177         int type = __IEEE802154_DEV_INVALID;
 178
 179         pr_debug("%s\n", __func__);
 180
 181         if (!info->attrs[IEEE802154_ATTR_PHY_NAME])
 182                 return -EINVAL;
 183
 184         name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
 185         if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0')
 186                 return -EINVAL; /* phy name should be null-terminated */
 187
 188         if (info->attrs[IEEE802154_ATTR_DEV_NAME]) {
 189                 devname = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]);
 190                 if (devname[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1]
 191                                 != '\0')
 192                         return -EINVAL; /* phy name should be null-terminated */
 193         } else  {
 194                 devname = "wpan%d";
 195         }
 196
 197         if (strlen(devname) >= IFNAMSIZ)
 198                 return -ENAMETOOLONG;
 199
 200         phy = wpan_phy_find(name);
 201         if (!phy)
 202                 return -ENODEV;
 203
 204         msg = ieee802154_nl_new_reply(info, 0, IEEE802154_ADD_IFACE);
 205         if (!msg)
 206                 goto out_dev;
 207
 208         if (info->attrs[IEEE802154_ATTR_HW_ADDR] &&
 209             nla_len(info->attrs[IEEE802154_ATTR_HW_ADDR]) !=
 210                         IEEE802154_ADDR_LEN) {
 211                 rc = -EINVAL;
 212                 goto nla_put_failure;
 213         }
 214
 215         if (info->attrs[IEEE802154_ATTR_DEV_TYPE]) {
 216                 type = nla_get_u8(info->attrs[IEEE802154_ATTR_DEV_TYPE]);
 217                 if (type >= __IEEE802154_DEV_MAX) {
 218                         rc = -EINVAL;
 219                         goto nla_put_failure;
 220                 }
 221         }
 222
 223         dev = rdev_add_virtual_intf_deprecated(wpan_phy_to_rdev(phy), devname,
 224                                                type);
 225         if (IS_ERR(dev)) {
 226                 rc = PTR_ERR(dev);
 227                 goto nla_put_failure;
 228         }
 229         dev_hold(dev);
 230
 231         if (info->attrs[IEEE802154_ATTR_HW_ADDR]) {
 232                 struct sockaddr addr;
 233
 234                 addr.sa_family = ARPHRD_IEEE802154;
 235                 nla_memcpy(&addr.sa_data, info->attrs[IEEE802154_ATTR_HW_ADDR],
 236                            IEEE802154_ADDR_LEN);
 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         if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) ||
 249             nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, dev->name))
 250                 goto nla_put_failure;
 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         rdev_del_virtual_intf_deprecated(wpan_phy_to_rdev(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 int ieee802154_del_iface(struct sk_buff *skb, struct genl_info *info)
 270 {
 271         struct sk_buff *msg;
 272         struct wpan_phy *phy;
 273         const char *name;
 274         int rc;
 275         struct net_device *dev;
 276
 277         pr_debug("%s\n", __func__);
 278
 279         if (!info->attrs[IEEE802154_ATTR_DEV_NAME])
 280                 return -EINVAL;
 281
 282         name = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]);
 283         if (name[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1] != '\0')
 284                 return -EINVAL; /* name should be null-terminated */
 285
 286         dev = dev_get_by_name(genl_info_net(info), name);
 287         if (!dev)
 288                 return -ENODEV;
 289
 290         phy = dev->ieee802154_ptr->wpan_phy;
 291         BUG_ON(!phy);
 292         get_device(&phy->dev);
 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         rtnl_lock();
 323         rdev_del_virtual_intf_deprecated(wpan_phy_to_rdev(phy), dev);
 324
 325         /* We don't have device anymore */
 326         dev_put(dev);
 327         dev = NULL;
 328
 329         rtnl_unlock();
 330
 331         if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) ||
 332             nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, name))
 333                 goto nla_put_failure;
 334         wpan_phy_put(phy);
 335
 336         return ieee802154_nl_reply(msg, info);
 337
 338 nla_put_failure:
 339         nlmsg_free(msg);
 340 out_dev:
 341         wpan_phy_put(phy);
 342         if (dev)
 343                 dev_put(dev);
 344
 345         return rc;
 346 }