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         return genlmsg_end(msg, hdr);
  69
  70 nla_put_failure:
  71         mutex_unlock(&phy->pib_lock);
  72         genlmsg_cancel(msg, hdr);
  73 out:
  74         kfree(buf);
  75         return -EMSGSIZE;
  76 }
  77
  78 int ieee802154_list_phy(struct sk_buff *skb, struct genl_info *info)
  79 {
  80         /* Request for interface name, index, type, IEEE address,
  81          * PAN Id, short address
  82          */
  83         struct sk_buff *msg;
  84         struct wpan_phy *phy;
  85         const char *name;
  86         int rc = -ENOBUFS;
  87
  88         pr_debug("%s\n", __func__);
  89
  90         if (!info->attrs[IEEE802154_ATTR_PHY_NAME])
  91                 return -EINVAL;
  92
  93         name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
  94         if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0')
  95                 return -EINVAL; /* phy name should be null-terminated */
  96
  97         phy = wpan_phy_find(name);
  98         if (!phy)
  99                 return -ENODEV;
 100
 101         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 102         if (!msg)
 103                 goto out_dev;
 104
 105         rc = ieee802154_nl_fill_phy(msg, info->snd_portid, info->snd_seq,
 106                                     0, phy);
 107         if (rc < 0)
 108                 goto out_free;
 109
 110         wpan_phy_put(phy);
 111
 112         return genlmsg_reply(msg, info);
 113 out_free:
 114         nlmsg_free(msg);
 115 out_dev:
 116         wpan_phy_put(phy);
 117         return rc;
 118 }
 119
 120 struct dump_phy_data {
 121         struct sk_buff *skb;
 122         struct netlink_callback *cb;
 123         int idx, s_idx;
 124 };
 125
 126 static int ieee802154_dump_phy_iter(struct wpan_phy *phy, void *_data)
 127 {
 128         int rc;
 129         struct dump_phy_data *data = _data;
 130
 131         pr_debug("%s\n", __func__);
 132
 133         if (data->idx++ < data->s_idx)
 134                 return 0;
 135
 136         rc = ieee802154_nl_fill_phy(data->skb,
 137                                     NETLINK_CB(data->cb->skb).portid,
 138                                     data->cb->nlh->nlmsg_seq,
 139                                     NLM_F_MULTI,
 140                                     phy);
 141
 142         if (rc < 0) {
 143                 data->idx--;
 144                 return rc;
 145         }
 146
 147         return 0;
 148 }
 149
 150 int ieee802154_dump_phy(struct sk_buff *skb, struct netlink_callback *cb)
 151 {
 152         struct dump_phy_data data = {
 153                 .cb = cb,
 154                 .skb = skb,
 155                 .s_idx = cb->args[0],
 156                 .idx = 0,
 157         };
 158
 159         pr_debug("%s\n", __func__);
 160
 161         wpan_phy_for_each(ieee802154_dump_phy_iter, &data);
 162
 163         cb->args[0] = data.idx;
 164
 165         return skb->len;
 166 }
 167
 168 int ieee802154_add_iface(struct sk_buff *skb, struct genl_info *info)
 169 {
 170         struct sk_buff *msg;
 171         struct wpan_phy *phy;
 172         const char *name;
 173         const char *devname;
 174         int rc = -ENOBUFS;
 175         struct net_device *dev;
 176         int type = __IEEE802154_DEV_INVALID;
 177
 178         pr_debug("%s\n", __func__);
 179
 180         if (!info->attrs[IEEE802154_ATTR_PHY_NAME])
 181                 return -EINVAL;
 182
 183         name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
 184         if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0')
 185                 return -EINVAL; /* phy name should be null-terminated */
 186
 187         if (info->attrs[IEEE802154_ATTR_DEV_NAME]) {
 188                 devname = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]);
 189                 if (devname[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1]
 190                                 != '\0')
 191                         return -EINVAL; /* phy name should be null-terminated */
 192         } else  {
 193                 devname = "wpan%d";
 194         }
 195
 196         if (strlen(devname) >= IFNAMSIZ)
 197                 return -ENAMETOOLONG;
 198
 199         phy = wpan_phy_find(name);
 200         if (!phy)
 201                 return -ENODEV;
 202
 203         msg = ieee802154_nl_new_reply(info, 0, IEEE802154_ADD_IFACE);
 204         if (!msg)
 205                 goto out_dev;
 206
 207         if (info->attrs[IEEE802154_ATTR_HW_ADDR] &&
 208             nla_len(info->attrs[IEEE802154_ATTR_HW_ADDR]) !=
 209                         IEEE802154_ADDR_LEN) {
 210                 rc = -EINVAL;
 211                 goto nla_put_failure;
 212         }
 213
 214         if (info->attrs[IEEE802154_ATTR_DEV_TYPE]) {
 215                 type = nla_get_u8(info->attrs[IEEE802154_ATTR_DEV_TYPE]);
 216                 if (type >= __IEEE802154_DEV_MAX) {
 217                         rc = -EINVAL;
 218                         goto nla_put_failure;
 219                 }
 220         }
 221
 222         dev = rdev_add_virtual_intf_deprecated(wpan_phy_to_rdev(phy), devname,
 223                                                type);
 224         if (IS_ERR(dev)) {
 225                 rc = PTR_ERR(dev);
 226                 goto nla_put_failure;
 227         }
 228         dev_hold(dev);
 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                 /* strangely enough, some callbacks (inetdev_event) from
 238                  * dev_set_mac_address require RTNL_LOCK
 239                  */
 240                 rtnl_lock();
 241                 rc = dev_set_mac_address(dev, &addr);
 242                 rtnl_unlock();
 243                 if (rc)
 244                         goto dev_unregister;
 245         }
 246
 247         if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) ||
 248             nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, dev->name))
 249                 goto nla_put_failure;
 250         dev_put(dev);
 251
 252         wpan_phy_put(phy);
 253
 254         return ieee802154_nl_reply(msg, info);
 255
 256 dev_unregister:
 257         rtnl_lock(); /* del_iface must be called with RTNL lock */
 258         rdev_del_virtual_intf_deprecated(wpan_phy_to_rdev(phy), dev);
 259         dev_put(dev);
 260         rtnl_unlock();
 261 nla_put_failure:
 262         nlmsg_free(msg);
 263 out_dev:
 264         wpan_phy_put(phy);
 265         return rc;
 266 }
 267
 268 int ieee802154_del_iface(struct sk_buff *skb, struct genl_info *info)
 269 {
 270         struct sk_buff *msg;
 271         struct wpan_phy *phy;
 272         const char *name;
 273         int rc;
 274         struct net_device *dev;
 275
 276         pr_debug("%s\n", __func__);
 277
 278         if (!info->attrs[IEEE802154_ATTR_DEV_NAME])
 279                 return -EINVAL;
 280
 281         name = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]);
 282         if (name[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1] != '\0')
 283                 return -EINVAL; /* name should be null-terminated */
 284
 285         dev = dev_get_by_name(genl_info_net(info), name);
 286         if (!dev)
 287                 return -ENODEV;
 288
 289         phy = dev->ieee802154_ptr->wpan_phy;
 290         BUG_ON(!phy);
 291         get_device(&phy->dev);
 292
 293         rc = -EINVAL;
 294         /* phy name is optional, but should be checked if it's given */
 295         if (info->attrs[IEEE802154_ATTR_PHY_NAME]) {
 296                 struct wpan_phy *phy2;
 297
 298                 const char *pname =
 299                         nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
 300                 if (pname[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1]
 301                                 != '\0')
 302                         /* name should be null-terminated */
 303                         goto out_dev;
 304
 305                 phy2 = wpan_phy_find(pname);
 306                 if (!phy2)
 307                         goto out_dev;
 308
 309                 if (phy != phy2) {
 310                         wpan_phy_put(phy2);
 311                         goto out_dev;
 312                 }
 313         }
 314
 315         rc = -ENOBUFS;
 316
 317         msg = ieee802154_nl_new_reply(info, 0, IEEE802154_DEL_IFACE);
 318         if (!msg)
 319                 goto out_dev;
 320
 321         rtnl_lock();
 322         rdev_del_virtual_intf_deprecated(wpan_phy_to_rdev(phy), dev);
 323
 324         /* We don't have device anymore */
 325         dev_put(dev);
 326         dev = NULL;
 327
 328         rtnl_unlock();
 329
 330         if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) ||
 331             nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, name))
 332                 goto nla_put_failure;
 333         wpan_phy_put(phy);
 334
 335         return ieee802154_nl_reply(msg, info);
 336
 337 nla_put_failure:
 338         nlmsg_free(msg);
 339 out_dev:
 340         wpan_phy_put(phy);
 341         if (dev)
 342                 dev_put(dev);
 343
 344         return rc;
 345 }