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  * 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
  34 static int ieee802154_nl_fill_phy(struct sk_buff *msg, u32 portid,
  35                                   u32 seq, int flags, struct wpan_phy *phy)
  36 {
  37         void *hdr;
  38         int i, pages = 0;
  39         uint32_t *buf = kzalloc(32 * sizeof(uint32_t), GFP_KERNEL);
  40
  41         pr_debug("%s\n", __func__);
  42
  43         if (!buf)
  44                 return -EMSGSIZE;
  45
  46         hdr = genlmsg_put(msg, 0, seq, &nl802154_family, flags,
  47                           IEEE802154_LIST_PHY);
  48         if (!hdr)
  49                 goto out;
  50
  51         mutex_lock(&phy->pib_lock);
  52         if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) ||
  53             nla_put_u8(msg, IEEE802154_ATTR_PAGE, phy->current_page) ||
  54             nla_put_u8(msg, IEEE802154_ATTR_CHANNEL, phy->current_channel))
  55                 goto nla_put_failure;
  56         for (i = 0; i < 32; i++) {
  57                 if (phy->channels_supported[i])
  58                         buf[pages++] = phy->channels_supported[i] | (i << 27);
  59         }
  60         if (pages &&
  61             nla_put(msg, IEEE802154_ATTR_CHANNEL_PAGE_LIST,
  62                     pages * sizeof(uint32_t), buf))
  63                 goto nla_put_failure;
  64         mutex_unlock(&phy->pib_lock);
  65         kfree(buf);
  66         return genlmsg_end(msg, hdr);
  67
  68 nla_put_failure:
  69         mutex_unlock(&phy->pib_lock);
  70         genlmsg_cancel(msg, hdr);
  71 out:
  72         kfree(buf);
  73         return -EMSGSIZE;
  74 }
  75
  76 int ieee802154_list_phy(struct sk_buff *skb, struct genl_info *info)
  77 {
  78         /* Request for interface name, index, type, IEEE address,
  79          * PAN Id, short address
  80          */
  81         struct sk_buff *msg;
  82         struct wpan_phy *phy;
  83         const char *name;
  84         int rc = -ENOBUFS;
  85
  86         pr_debug("%s\n", __func__);
  87
  88         if (!info->attrs[IEEE802154_ATTR_PHY_NAME])
  89                 return -EINVAL;
  90
  91         name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
  92         if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0')
  93                 return -EINVAL; /* phy name should be null-terminated */
  94
  95
  96         phy = wpan_phy_find(name);
  97         if (!phy)
  98                 return -ENODEV;
  99
 100         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 101         if (!msg)
 102                 goto out_dev;
 103
 104         rc = ieee802154_nl_fill_phy(msg, info->snd_portid, info->snd_seq,
 105                                     0, phy);
 106         if (rc < 0)
 107                 goto out_free;
 108
 109         wpan_phy_put(phy);
 110
 111         return genlmsg_reply(msg, info);
 112 out_free:
 113         nlmsg_free(msg);
 114 out_dev:
 115         wpan_phy_put(phy);
 116         return rc;
 117 }
 118
 119 struct dump_phy_data {
 120         struct sk_buff *skb;
 121         struct netlink_callback *cb;
 122         int idx, s_idx;
 123 };
 124
 125 static int ieee802154_dump_phy_iter(struct wpan_phy *phy, void *_data)
 126 {
 127         int rc;
 128         struct dump_phy_data *data = _data;
 129
 130         pr_debug("%s\n", __func__);
 131
 132         if (data->idx++ < data->s_idx)
 133                 return 0;
 134
 135         rc = ieee802154_nl_fill_phy(data->skb,
 136                                     NETLINK_CB(data->cb->skb).portid,
 137                                     data->cb->nlh->nlmsg_seq,
 138                                     NLM_F_MULTI,
 139                                     phy);
 140
 141         if (rc < 0) {
 142                 data->idx--;
 143                 return rc;
 144         }
 145
 146         return 0;
 147 }
 148
 149 int ieee802154_dump_phy(struct sk_buff *skb, struct netlink_callback *cb)
 150 {
 151         struct dump_phy_data data = {
 152                 .cb = cb,
 153                 .skb = skb,
 154                 .s_idx = cb->args[0],
 155                 .idx = 0,
 156         };
 157
 158         pr_debug("%s\n", __func__);
 159
 160         wpan_phy_for_each(ieee802154_dump_phy_iter, &data);
 161
 162         cb->args[0] = data.idx;
 163
 164         return skb->len;
 165 }
 166
 167 int ieee802154_add_iface(struct sk_buff *skb, struct genl_info *info)
 168 {
 169         struct sk_buff *msg;
 170         struct wpan_phy *phy;
 171         const char *name;
 172         const char *devname;
 173         int rc = -ENOBUFS;
 174         struct net_device *dev;
 175         int type = __IEEE802154_DEV_INVALID;
 176
 177         pr_debug("%s\n", __func__);
 178
 179         if (!info->attrs[IEEE802154_ATTR_PHY_NAME])
 180                 return -EINVAL;
 181
 182         name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
 183         if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0')
 184                 return -EINVAL; /* phy name should be null-terminated */
 185
 186         if (info->attrs[IEEE802154_ATTR_DEV_NAME]) {
 187                 devname = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]);
 188                 if (devname[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1]
 189                                 != '\0')
 190                         return -EINVAL; /* phy name should be null-terminated */
 191         } else  {
 192                 devname = "wpan%d";
 193         }
 194
 195         if (strlen(devname) >= IFNAMSIZ)
 196                 return -ENAMETOOLONG;
 197
 198         phy = wpan_phy_find(name);
 199         if (!phy)
 200                 return -ENODEV;
 201
 202         msg = ieee802154_nl_new_reply(info, 0, IEEE802154_ADD_IFACE);
 203         if (!msg)
 204                 goto out_dev;
 205
 206         if (!phy->add_iface) {
 207                 rc = -EINVAL;
 208                 goto nla_put_failure;
 209         }
 210
 211         if (info->attrs[IEEE802154_ATTR_HW_ADDR] &&
 212             nla_len(info->attrs[IEEE802154_ATTR_HW_ADDR]) !=
 213                         IEEE802154_ADDR_LEN) {
 214                 rc = -EINVAL;
 215                 goto nla_put_failure;
 216         }
 217
 218         if (info->attrs[IEEE802154_ATTR_DEV_TYPE]) {
 219                 type = nla_get_u8(info->attrs[IEEE802154_ATTR_DEV_TYPE]);
 220                 if (type >= __IEEE802154_DEV_MAX) {
 221                         rc = -EINVAL;
 222                         goto nla_put_failure;
 223                 }
 224         }
 225
 226         dev = phy->add_iface(phy, devname, type);
 227         if (IS_ERR(dev)) {
 228                 rc = PTR_ERR(dev);
 229                 goto nla_put_failure;
 230         }
 231
 232         if (info->attrs[IEEE802154_ATTR_HW_ADDR]) {
 233                 struct sockaddr addr;
 234
 235                 addr.sa_family = ARPHRD_IEEE802154;
 236                 nla_memcpy(&addr.sa_data, info->attrs[IEEE802154_ATTR_HW_ADDR],
 237                            IEEE802154_ADDR_LEN);
 238
 239                 /* strangely enough, some callbacks (inetdev_event) from
 240                  * dev_set_mac_address require RTNL_LOCK
 241                  */
 242                 rtnl_lock();
 243                 rc = dev_set_mac_address(dev, &addr);
 244                 rtnl_unlock();
 245                 if (rc)
 246                         goto dev_unregister;
 247         }
 248
 249         if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) ||
 250             nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, dev->name))
 251                 goto nla_put_failure;
 252         dev_put(dev);
 253
 254         wpan_phy_put(phy);
 255
 256         return ieee802154_nl_reply(msg, info);
 257
 258 dev_unregister:
 259         rtnl_lock(); /* del_iface must be called with RTNL lock */
 260         phy->del_iface(phy, dev);
 261         dev_put(dev);
 262         rtnl_unlock();
 263 nla_put_failure:
 264         nlmsg_free(msg);
 265 out_dev:
 266         wpan_phy_put(phy);
 267         return rc;
 268 }
 269
 270 int ieee802154_del_iface(struct sk_buff *skb, 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         if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) ||
 337             nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, name))
 338                 goto nla_put_failure;
 339         wpan_phy_put(phy);
 340
 341         return ieee802154_nl_reply(msg, info);
 342
 343 nla_put_failure:
 344         nlmsg_free(msg);
 345 out_dev:
 346         wpan_phy_put(phy);
 347         if (dev)
 348                 dev_put(dev);
 349
 350         return rc;
 351 }