linux/net/ieee802154/nl-phy.c
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   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
  38static 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        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
  72nla_put_failure:
  73        mutex_unlock(&phy->pib_lock);
  74        genlmsg_cancel(msg, hdr);
  75out:
  76        kfree(buf);
  77        return -EMSGSIZE;
  78}
  79
  80static 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_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);
 116out_free:
 117        nlmsg_free(msg);
 118out_dev:
 119        wpan_phy_put(phy);
 120        return rc;
 121
 122}
 123
 124struct dump_phy_data {
 125        struct sk_buff *skb;
 126        struct netlink_callback *cb;
 127        int idx, s_idx;
 128};
 129
 130static 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
 154static 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
 173static 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
 264dev_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();
 269nla_put_failure:
 270        nlmsg_free(msg);
 271out_dev:
 272        wpan_phy_put(phy);
 273        return rc;
 274}
 275
 276static 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
 350nla_put_failure:
 351        nlmsg_free(msg);
 352out_dev:
 353        wpan_phy_put(phy);
 354        if (dev)
 355                dev_put(dev);
 356
 357        return rc;
 358}
 359
 360static 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 */
 370int 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}
 384
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