LXR linux/net/wireless/wext-core.c

   1/*
   2 * This file implement the Wireless Extensions core API.
   3 *
   4 * Authors :    Jean Tourrilhes - HPL - <jt@hpl.hp.com>
   5 * Copyright (c) 1997-2007 Jean Tourrilhes, All Rights Reserved.
   6 * Copyright    2009 Johannes Berg <johannes@sipsolutions.net>
   7 *
   8 * (As all part of the Linux kernel, this file is GPL)
   9 */
  10#include <linux/kernel.h>
  11#include <linux/netdevice.h>
  12#include <linux/rtnetlink.h>
  13#include <linux/slab.h>
  14#include <linux/wireless.h>
  15#include <linux/uaccess.h>
  16#include <linux/export.h>
  17#include <net/cfg80211.h>
  18#include <net/iw_handler.h>
  19#include <net/netlink.h>
  20#include <net/wext.h>
  21#include <net/net_namespace.h>
  22
  23typedef int (*wext_ioctl_func)(struct net_device *, struct iwreq *,
  24                               unsigned int, struct iw_request_info *,
  25                               iw_handler);
  26
  27
  28/*
  29 * Meta-data about all the standard Wireless Extension request we
  30 * know about.
  31 */
  32static const struct iw_ioctl_description standard_ioctl[] = {
  33        [IW_IOCTL_IDX(SIOCSIWCOMMIT)] = {
  34                .header_type    = IW_HEADER_TYPE_NULL,
  35        },
  36        [IW_IOCTL_IDX(SIOCGIWNAME)] = {
  37                .header_type    = IW_HEADER_TYPE_CHAR,
  38                .flags          = IW_DESCR_FLAG_DUMP,
  39        },
  40        [IW_IOCTL_IDX(SIOCSIWNWID)] = {
  41                .header_type    = IW_HEADER_TYPE_PARAM,
  42                .flags          = IW_DESCR_FLAG_EVENT,
  43        },
  44        [IW_IOCTL_IDX(SIOCGIWNWID)] = {
  45                .header_type    = IW_HEADER_TYPE_PARAM,
  46                .flags          = IW_DESCR_FLAG_DUMP,
  47        },
  48        [IW_IOCTL_IDX(SIOCSIWFREQ)] = {
  49                .header_type    = IW_HEADER_TYPE_FREQ,
  50                .flags          = IW_DESCR_FLAG_EVENT,
  51        },
  52        [IW_IOCTL_IDX(SIOCGIWFREQ)] = {
  53                .header_type    = IW_HEADER_TYPE_FREQ,
  54                .flags          = IW_DESCR_FLAG_DUMP,
  55        },
  56        [IW_IOCTL_IDX(SIOCSIWMODE)] = {
  57                .header_type    = IW_HEADER_TYPE_UINT,
  58                .flags          = IW_DESCR_FLAG_EVENT,
  59        },
  60        [IW_IOCTL_IDX(SIOCGIWMODE)] = {
  61                .header_type    = IW_HEADER_TYPE_UINT,
  62                .flags          = IW_DESCR_FLAG_DUMP,
  63        },
  64        [IW_IOCTL_IDX(SIOCSIWSENS)] = {
  65                .header_type    = IW_HEADER_TYPE_PARAM,
  66        },
  67        [IW_IOCTL_IDX(SIOCGIWSENS)] = {
  68                .header_type    = IW_HEADER_TYPE_PARAM,
  69        },
  70        [IW_IOCTL_IDX(SIOCSIWRANGE)] = {
  71                .header_type    = IW_HEADER_TYPE_NULL,
  72        },
  73        [IW_IOCTL_IDX(SIOCGIWRANGE)] = {
  74                .header_type    = IW_HEADER_TYPE_POINT,
  75                .token_size     = 1,
  76                .max_tokens     = sizeof(struct iw_range),
  77                .flags          = IW_DESCR_FLAG_DUMP,
  78        },
  79        [IW_IOCTL_IDX(SIOCSIWPRIV)] = {
  80                .header_type    = IW_HEADER_TYPE_NULL,
  81        },
  82        [IW_IOCTL_IDX(SIOCGIWPRIV)] = { /* (handled directly by us) */
  83                .header_type    = IW_HEADER_TYPE_POINT,
  84                .token_size     = sizeof(struct iw_priv_args),
  85                .max_tokens     = 16,
  86                .flags          = IW_DESCR_FLAG_NOMAX,
  87        },
  88        [IW_IOCTL_IDX(SIOCSIWSTATS)] = {
  89                .header_type    = IW_HEADER_TYPE_NULL,
  90        },
  91        [IW_IOCTL_IDX(SIOCGIWSTATS)] = { /* (handled directly by us) */
  92                .header_type    = IW_HEADER_TYPE_POINT,
  93                .token_size     = 1,
  94                .max_tokens     = sizeof(struct iw_statistics),
  95                .flags          = IW_DESCR_FLAG_DUMP,
  96        },
  97        [IW_IOCTL_IDX(SIOCSIWSPY)] = {
  98                .header_type    = IW_HEADER_TYPE_POINT,
  99                .token_size     = sizeof(struct sockaddr),
 100                .max_tokens     = IW_MAX_SPY,
 101        },
 102        [IW_IOCTL_IDX(SIOCGIWSPY)] = {
 103                .header_type    = IW_HEADER_TYPE_POINT,
 104                .token_size     = sizeof(struct sockaddr) +
 105                                  sizeof(struct iw_quality),
 106                .max_tokens     = IW_MAX_SPY,
 107        },
 108        [IW_IOCTL_IDX(SIOCSIWTHRSPY)] = {
 109                .header_type    = IW_HEADER_TYPE_POINT,
 110                .token_size     = sizeof(struct iw_thrspy),
 111                .min_tokens     = 1,
 112                .max_tokens     = 1,
 113        },
 114        [IW_IOCTL_IDX(SIOCGIWTHRSPY)] = {
 115                .header_type    = IW_HEADER_TYPE_POINT,
 116                .token_size     = sizeof(struct iw_thrspy),
 117                .min_tokens     = 1,
 118                .max_tokens     = 1,
 119        },
 120        [IW_IOCTL_IDX(SIOCSIWAP)] = {
 121                .header_type    = IW_HEADER_TYPE_ADDR,
 122        },
 123        [IW_IOCTL_IDX(SIOCGIWAP)] = {
 124                .header_type    = IW_HEADER_TYPE_ADDR,
 125                .flags          = IW_DESCR_FLAG_DUMP,
 126        },
 127        [IW_IOCTL_IDX(SIOCSIWMLME)] = {
 128                .header_type    = IW_HEADER_TYPE_POINT,
 129                .token_size     = 1,
 130                .min_tokens     = sizeof(struct iw_mlme),
 131                .max_tokens     = sizeof(struct iw_mlme),
 132        },
 133        [IW_IOCTL_IDX(SIOCGIWAPLIST)] = {
 134                .header_type    = IW_HEADER_TYPE_POINT,
 135                .token_size     = sizeof(struct sockaddr) +
 136                                  sizeof(struct iw_quality),
 137                .max_tokens     = IW_MAX_AP,
 138                .flags          = IW_DESCR_FLAG_NOMAX,
 139        },
 140        [IW_IOCTL_IDX(SIOCSIWSCAN)] = {
 141                .header_type    = IW_HEADER_TYPE_POINT,
 142                .token_size     = 1,
 143                .min_tokens     = 0,
 144                .max_tokens     = sizeof(struct iw_scan_req),
 145        },
 146        [IW_IOCTL_IDX(SIOCGIWSCAN)] = {
 147                .header_type    = IW_HEADER_TYPE_POINT,
 148                .token_size     = 1,
 149                .max_tokens     = IW_SCAN_MAX_DATA,
 150                .flags          = IW_DESCR_FLAG_NOMAX,
 151        },
 152        [IW_IOCTL_IDX(SIOCSIWESSID)] = {
 153                .header_type    = IW_HEADER_TYPE_POINT,
 154                .token_size     = 1,
 155                .max_tokens     = IW_ESSID_MAX_SIZE,
 156                .flags          = IW_DESCR_FLAG_EVENT,
 157        },
 158        [IW_IOCTL_IDX(SIOCGIWESSID)] = {
 159                .header_type    = IW_HEADER_TYPE_POINT,
 160                .token_size     = 1,
 161                .max_tokens     = IW_ESSID_MAX_SIZE,
 162                .flags          = IW_DESCR_FLAG_DUMP,
 163        },
 164        [IW_IOCTL_IDX(SIOCSIWNICKN)] = {
 165                .header_type    = IW_HEADER_TYPE_POINT,
 166                .token_size     = 1,
 167                .max_tokens     = IW_ESSID_MAX_SIZE,
 168        },
 169        [IW_IOCTL_IDX(SIOCGIWNICKN)] = {
 170                .header_type    = IW_HEADER_TYPE_POINT,
 171                .token_size     = 1,
 172                .max_tokens     = IW_ESSID_MAX_SIZE,
 173        },
 174        [IW_IOCTL_IDX(SIOCSIWRATE)] = {
 175                .header_type    = IW_HEADER_TYPE_PARAM,
 176        },
 177        [IW_IOCTL_IDX(SIOCGIWRATE)] = {
 178                .header_type    = IW_HEADER_TYPE_PARAM,
 179        },
 180        [IW_IOCTL_IDX(SIOCSIWRTS)] = {
 181                .header_type    = IW_HEADER_TYPE_PARAM,
 182        },
 183        [IW_IOCTL_IDX(SIOCGIWRTS)] = {
 184                .header_type    = IW_HEADER_TYPE_PARAM,
 185        },
 186        [IW_IOCTL_IDX(SIOCSIWFRAG)] = {
 187                .header_type    = IW_HEADER_TYPE_PARAM,
 188        },
 189        [IW_IOCTL_IDX(SIOCGIWFRAG)] = {
 190                .header_type    = IW_HEADER_TYPE_PARAM,
 191        },
 192        [IW_IOCTL_IDX(SIOCSIWTXPOW)] = {
 193                .header_type    = IW_HEADER_TYPE_PARAM,
 194        },
 195        [IW_IOCTL_IDX(SIOCGIWTXPOW)] = {
 196                .header_type    = IW_HEADER_TYPE_PARAM,
 197        },
 198        [IW_IOCTL_IDX(SIOCSIWRETRY)] = {
 199                .header_type    = IW_HEADER_TYPE_PARAM,
 200        },
 201        [IW_IOCTL_IDX(SIOCGIWRETRY)] = {
 202                .header_type    = IW_HEADER_TYPE_PARAM,
 203        },
 204        [IW_IOCTL_IDX(SIOCSIWENCODE)] = {
 205                .header_type    = IW_HEADER_TYPE_POINT,
 206                .token_size     = 1,
 207                .max_tokens     = IW_ENCODING_TOKEN_MAX,
 208                .flags          = IW_DESCR_FLAG_EVENT | IW_DESCR_FLAG_RESTRICT,
 209        },
 210        [IW_IOCTL_IDX(SIOCGIWENCODE)] = {
 211                .header_type    = IW_HEADER_TYPE_POINT,
 212                .token_size     = 1,
 213                .max_tokens     = IW_ENCODING_TOKEN_MAX,
 214                .flags          = IW_DESCR_FLAG_DUMP | IW_DESCR_FLAG_RESTRICT,
 215        },
 216        [IW_IOCTL_IDX(SIOCSIWPOWER)] = {
 217                .header_type    = IW_HEADER_TYPE_PARAM,
 218        },
 219        [IW_IOCTL_IDX(SIOCGIWPOWER)] = {
 220                .header_type    = IW_HEADER_TYPE_PARAM,
 221        },
 222        [IW_IOCTL_IDX(SIOCSIWGENIE)] = {
 223                .header_type    = IW_HEADER_TYPE_POINT,
 224                .token_size     = 1,
 225                .max_tokens     = IW_GENERIC_IE_MAX,
 226        },
 227        [IW_IOCTL_IDX(SIOCGIWGENIE)] = {
 228                .header_type    = IW_HEADER_TYPE_POINT,
 229                .token_size     = 1,
 230                .max_tokens     = IW_GENERIC_IE_MAX,
 231        },
 232        [IW_IOCTL_IDX(SIOCSIWAUTH)] = {
 233                .header_type    = IW_HEADER_TYPE_PARAM,
 234        },
 235        [IW_IOCTL_IDX(SIOCGIWAUTH)] = {
 236                .header_type    = IW_HEADER_TYPE_PARAM,
 237        },
 238        [IW_IOCTL_IDX(SIOCSIWENCODEEXT)] = {
 239                .header_type    = IW_HEADER_TYPE_POINT,
 240                .token_size     = 1,
 241                .min_tokens     = sizeof(struct iw_encode_ext),
 242                .max_tokens     = sizeof(struct iw_encode_ext) +
 243                                  IW_ENCODING_TOKEN_MAX,
 244        },
 245        [IW_IOCTL_IDX(SIOCGIWENCODEEXT)] = {
 246                .header_type    = IW_HEADER_TYPE_POINT,
 247                .token_size     = 1,
 248                .min_tokens     = sizeof(struct iw_encode_ext),
 249                .max_tokens     = sizeof(struct iw_encode_ext) +
 250                                  IW_ENCODING_TOKEN_MAX,
 251        },
 252        [IW_IOCTL_IDX(SIOCSIWPMKSA)] = {
 253                .header_type    = IW_HEADER_TYPE_POINT,
 254                .token_size     = 1,
 255                .min_tokens     = sizeof(struct iw_pmksa),
 256                .max_tokens     = sizeof(struct iw_pmksa),
 257        },
 258};
 259static const unsigned int standard_ioctl_num = ARRAY_SIZE(standard_ioctl);
 260
 261/*
 262 * Meta-data about all the additional standard Wireless Extension events
 263 * we know about.
 264 */
 265static const struct iw_ioctl_description standard_event[] = {
 266        [IW_EVENT_IDX(IWEVTXDROP)] = {
 267                .header_type    = IW_HEADER_TYPE_ADDR,
 268        },
 269        [IW_EVENT_IDX(IWEVQUAL)] = {
 270                .header_type    = IW_HEADER_TYPE_QUAL,
 271        },
 272        [IW_EVENT_IDX(IWEVCUSTOM)] = {
 273                .header_type    = IW_HEADER_TYPE_POINT,
 274                .token_size     = 1,
 275                .max_tokens     = IW_CUSTOM_MAX,
 276        },
 277        [IW_EVENT_IDX(IWEVREGISTERED)] = {
 278                .header_type    = IW_HEADER_TYPE_ADDR,
 279        },
 280        [IW_EVENT_IDX(IWEVEXPIRED)] = {
 281                .header_type    = IW_HEADER_TYPE_ADDR,
 282        },
 283        [IW_EVENT_IDX(IWEVGENIE)] = {
 284                .header_type    = IW_HEADER_TYPE_POINT,
 285                .token_size     = 1,
 286                .max_tokens     = IW_GENERIC_IE_MAX,
 287        },
 288        [IW_EVENT_IDX(IWEVMICHAELMICFAILURE)] = {
 289                .header_type    = IW_HEADER_TYPE_POINT,
 290                .token_size     = 1,
 291                .max_tokens     = sizeof(struct iw_michaelmicfailure),
 292        },
 293        [IW_EVENT_IDX(IWEVASSOCREQIE)] = {
 294                .header_type    = IW_HEADER_TYPE_POINT,
 295                .token_size     = 1,
 296                .max_tokens     = IW_GENERIC_IE_MAX,
 297        },
 298        [IW_EVENT_IDX(IWEVASSOCRESPIE)] = {
 299                .header_type    = IW_HEADER_TYPE_POINT,
 300                .token_size     = 1,
 301                .max_tokens     = IW_GENERIC_IE_MAX,
 302        },
 303        [IW_EVENT_IDX(IWEVPMKIDCAND)] = {
 304                .header_type    = IW_HEADER_TYPE_POINT,
 305                .token_size     = 1,
 306                .max_tokens     = sizeof(struct iw_pmkid_cand),
 307        },
 308};
 309static const unsigned int standard_event_num = ARRAY_SIZE(standard_event);
 310
 311/* Size (in bytes) of various events */
 312static const int event_type_size[] = {
 313        IW_EV_LCP_LEN,                  /* IW_HEADER_TYPE_NULL */
 314        0,
 315        IW_EV_CHAR_LEN,                 /* IW_HEADER_TYPE_CHAR */
 316        0,
 317        IW_EV_UINT_LEN,                 /* IW_HEADER_TYPE_UINT */
 318        IW_EV_FREQ_LEN,                 /* IW_HEADER_TYPE_FREQ */
 319        IW_EV_ADDR_LEN,                 /* IW_HEADER_TYPE_ADDR */
 320        0,
 321        IW_EV_POINT_LEN,                /* Without variable payload */
 322        IW_EV_PARAM_LEN,                /* IW_HEADER_TYPE_PARAM */
 323        IW_EV_QUAL_LEN,                 /* IW_HEADER_TYPE_QUAL */
 324};
 325
 326#ifdef CONFIG_COMPAT
 327static const int compat_event_type_size[] = {
 328        IW_EV_COMPAT_LCP_LEN,           /* IW_HEADER_TYPE_NULL */
 329        0,
 330        IW_EV_COMPAT_CHAR_LEN,          /* IW_HEADER_TYPE_CHAR */
 331        0,
 332        IW_EV_COMPAT_UINT_LEN,          /* IW_HEADER_TYPE_UINT */
 333        IW_EV_COMPAT_FREQ_LEN,          /* IW_HEADER_TYPE_FREQ */
 334        IW_EV_COMPAT_ADDR_LEN,          /* IW_HEADER_TYPE_ADDR */
 335        0,
 336        IW_EV_COMPAT_POINT_LEN,         /* Without variable payload */
 337        IW_EV_COMPAT_PARAM_LEN,         /* IW_HEADER_TYPE_PARAM */
 338        IW_EV_COMPAT_QUAL_LEN,          /* IW_HEADER_TYPE_QUAL */
 339};
 340#endif
 341
 342
 343/* IW event code */
 344
 345void wireless_nlevent_flush(void)
 346{
 347        struct sk_buff *skb;
 348        struct net *net;
 349
 350        ASSERT_RTNL();
 351
 352        for_each_net(net) {
 353                while ((skb = skb_dequeue(&net->wext_nlevents)))
 354                        rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL,
 355                                    GFP_KERNEL);
 356        }
 357}
 358EXPORT_SYMBOL_GPL(wireless_nlevent_flush);
 359
 360static int wext_netdev_notifier_call(struct notifier_block *nb,
 361                                     unsigned long state, void *ptr)
 362{
 363        /*
 364         * When a netdev changes state in any way, flush all pending messages
 365         * to avoid them going out in a strange order, e.g. RTM_NEWLINK after
 366         * RTM_DELLINK, or with IFF_UP after without IFF_UP during dev_close()
 367         * or similar - all of which could otherwise happen due to delays from
 368         * schedule_work().
 369         */
 370        wireless_nlevent_flush();
 371
 372        return NOTIFY_OK;
 373}
 374
 375static struct notifier_block wext_netdev_notifier = {
 376        .notifier_call = wext_netdev_notifier_call,
 377};
 378
 379static int __net_init wext_pernet_init(struct net *net)
 380{
 381        skb_queue_head_init(&net->wext_nlevents);
 382        return 0;
 383}
 384
 385static void __net_exit wext_pernet_exit(struct net *net)
 386{
 387        skb_queue_purge(&net->wext_nlevents);
 388}
 389
 390static struct pernet_operations wext_pernet_ops = {
 391        .init = wext_pernet_init,
 392        .exit = wext_pernet_exit,
 393};
 394
 395static int __init wireless_nlevent_init(void)
 396{
 397        int err = register_pernet_subsys(&wext_pernet_ops);
 398
 399        if (err)
 400                return err;
 401
 402        return register_netdevice_notifier(&wext_netdev_notifier);
 403}
 404
 405subsys_initcall(wireless_nlevent_init);
 406
 407/* Process events generated by the wireless layer or the driver. */
 408static void wireless_nlevent_process(struct work_struct *work)
 409{
 410        rtnl_lock();
 411        wireless_nlevent_flush();
 412        rtnl_unlock();
 413}
 414
 415static DECLARE_WORK(wireless_nlevent_work, wireless_nlevent_process);
 416
 417static struct nlmsghdr *rtnetlink_ifinfo_prep(struct net_device *dev,
 418                                              struct sk_buff *skb)
 419{
 420        struct ifinfomsg *r;
 421        struct nlmsghdr  *nlh;
 422
 423        nlh = nlmsg_put(skb, 0, 0, RTM_NEWLINK, sizeof(*r), 0);
 424        if (!nlh)
 425                return NULL;
 426
 427        r = nlmsg_data(nlh);
 428        r->ifi_family = AF_UNSPEC;
 429        r->__ifi_pad = 0;
 430        r->ifi_type = dev->type;
 431        r->ifi_index = dev->ifindex;
 432        r->ifi_flags = dev_get_flags(dev);
 433        r->ifi_change = 0;      /* Wireless changes don't affect those flags */
 434
 435        if (nla_put_string(skb, IFLA_IFNAME, dev->name))
 436                goto nla_put_failure;
 437
 438        return nlh;
 439 nla_put_failure:
 440        nlmsg_cancel(skb, nlh);
 441        return NULL;
 442}
 443
 444
 445/*
 446 * Main event dispatcher. Called from other parts and drivers.
 447 * Send the event on the appropriate channels.
 448 * May be called from interrupt context.
 449 */
 450void wireless_send_event(struct net_device *    dev,
 451                         unsigned int           cmd,
 452                         union iwreq_data *     wrqu,
 453                         const char *           extra)
 454{
 455        const struct iw_ioctl_description *     descr = NULL;
 456        int extra_len = 0;
 457        struct iw_event  *event;                /* Mallocated whole event */
 458        int event_len;                          /* Its size */
 459        int hdr_len;                            /* Size of the event header */
 460        int wrqu_off = 0;                       /* Offset in wrqu */
 461        /* Don't "optimise" the following variable, it will crash */
 462        unsigned int    cmd_index;              /* *MUST* be unsigned */
 463        struct sk_buff *skb;
 464        struct nlmsghdr *nlh;
 465        struct nlattr *nla;
 466#ifdef CONFIG_COMPAT
 467        struct __compat_iw_event *compat_event;
 468        struct compat_iw_point compat_wrqu;
 469        struct sk_buff *compskb;
 470#endif
 471
 472        /*
 473         * Nothing in the kernel sends scan events with data, be safe.
 474         * This is necessary because we cannot fix up scan event data
 475         * for compat, due to being contained in 'extra', but normally
 476         * applications are required to retrieve the scan data anyway
 477         * and no data is included in the event, this codifies that
 478         * practice.
 479         */
 480        if (WARN_ON(cmd == SIOCGIWSCAN && extra))
 481                extra = NULL;
 482
 483        /* Get the description of the Event */
 484        if (cmd <= SIOCIWLAST) {
 485                cmd_index = IW_IOCTL_IDX(cmd);
 486                if (cmd_index < standard_ioctl_num)
 487                        descr = &(standard_ioctl[cmd_index]);
 488        } else {
 489                cmd_index = IW_EVENT_IDX(cmd);
 490                if (cmd_index < standard_event_num)
 491                        descr = &(standard_event[cmd_index]);
 492        }
 493        /* Don't accept unknown events */
 494        if (descr == NULL) {
 495                /* Note : we don't return an error to the driver, because
 496                 * the driver would not know what to do about it. It can't
 497                 * return an error to the user, because the event is not
 498                 * initiated by a user request.
 499                 * The best the driver could do is to log an error message.
 500                 * We will do it ourselves instead...
 501                 */
 502                netdev_err(dev, "(WE) : Invalid/Unknown Wireless Event (0x%04X)\n",
 503                           cmd);
 504                return;
 505        }
 506
 507        /* Check extra parameters and set extra_len */
 508        if (descr->header_type == IW_HEADER_TYPE_POINT) {
 509                /* Check if number of token fits within bounds */
 510                if (wrqu->data.length > descr->max_tokens) {
 511                        netdev_err(dev, "(WE) : Wireless Event (cmd=0x%04X) too big (%d)\n",
 512                                   cmd, wrqu->data.length);
 513                        return;
 514                }
 515                if (wrqu->data.length < descr->min_tokens) {
 516                        netdev_err(dev, "(WE) : Wireless Event (cmd=0x%04X) too small (%d)\n",
 517                                   cmd, wrqu->data.length);
 518                        return;
 519                }
 520                /* Calculate extra_len - extra is NULL for restricted events */
 521                if (extra != NULL)
 522                        extra_len = wrqu->data.length * descr->token_size;
 523                /* Always at an offset in wrqu */
 524                wrqu_off = IW_EV_POINT_OFF;
 525        }
 526
 527        /* Total length of the event */
 528        hdr_len = event_type_size[descr->header_type];
 529        event_len = hdr_len + extra_len;
 530
 531        /*
 532         * The problem for 64/32 bit.
 533         *
 534         * On 64-bit, a regular event is laid out as follows:
 535         *      |  0  |  1  |  2  |  3  |  4  |  5  |  6  |  7  |
 536         *      | event.len | event.cmd |     p a d d i n g     |
 537         *      | wrqu data ... (with the correct size)         |
 538         *
 539         * This padding exists because we manipulate event->u,
 540         * and 'event' is not packed.
 541         *
 542         * An iw_point event is laid out like this instead:
 543         *      |  0  |  1  |  2  |  3  |  4  |  5  |  6  |  7  |
 544         *      | event.len | event.cmd |     p a d d i n g     |
 545         *      | iwpnt.len | iwpnt.flg |     p a d d i n g     |
 546         *      | extra data  ...
 547         *
 548         * The second padding exists because struct iw_point is extended,
 549         * but this depends on the platform...
 550         *
 551         * On 32-bit, all the padding shouldn't be there.
 552         */
 553
 554        skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
 555        if (!skb)
 556                return;
 557
 558        /* Send via the RtNetlink event channel */
 559        nlh = rtnetlink_ifinfo_prep(dev, skb);
 560        if (WARN_ON(!nlh)) {
 561                kfree_skb(skb);
 562                return;
 563        }
 564
 565        /* Add the wireless events in the netlink packet */
 566        nla = nla_reserve(skb, IFLA_WIRELESS, event_len);
 567        if (!nla) {
 568                kfree_skb(skb);
 569                return;
 570        }
 571        event = nla_data(nla);
 572
 573        /* Fill event - first clear to avoid data leaking */
 574        memset(event, 0, hdr_len);
 575        event->len = event_len;
 576        event->cmd = cmd;
 577        memcpy(&event->u, ((char *) wrqu) + wrqu_off, hdr_len - IW_EV_LCP_LEN);
 578        if (extra_len)
 579                memcpy(((char *) event) + hdr_len, extra, extra_len);
 580
 581        nlmsg_end(skb, nlh);
 582#ifdef CONFIG_COMPAT
 583        hdr_len = compat_event_type_size[descr->header_type];
 584        event_len = hdr_len + extra_len;
 585
 586        compskb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
 587        if (!compskb) {
 588                kfree_skb(skb);
 589                return;
 590        }
 591
 592        /* Send via the RtNetlink event channel */
 593        nlh = rtnetlink_ifinfo_prep(dev, compskb);
 594        if (WARN_ON(!nlh)) {
 595                kfree_skb(skb);
 596                kfree_skb(compskb);
 597                return;
 598        }
 599
 600        /* Add the wireless events in the netlink packet */
 601        nla = nla_reserve(compskb, IFLA_WIRELESS, event_len);
 602        if (!nla) {
 603                kfree_skb(skb);
 604                kfree_skb(compskb);
 605                return;
 606        }
 607        compat_event = nla_data(nla);
 608
 609        compat_event->len = event_len;
 610        compat_event->cmd = cmd;
 611        if (descr->header_type == IW_HEADER_TYPE_POINT) {
 612                compat_wrqu.length = wrqu->data.length;
 613                compat_wrqu.flags = wrqu->data.flags;
 614                memcpy(&compat_event->pointer,
 615                        ((char *) &compat_wrqu) + IW_EV_COMPAT_POINT_OFF,
 616                        hdr_len - IW_EV_COMPAT_LCP_LEN);
 617                if (extra_len)
 618                        memcpy(((char *) compat_event) + hdr_len,
 619                                extra, extra_len);
 620        } else {
 621                /* extra_len must be zero, so no if (extra) needed */
 622                memcpy(&compat_event->pointer, wrqu,
 623                        hdr_len - IW_EV_COMPAT_LCP_LEN);
 624        }
 625
 626        nlmsg_end(compskb, nlh);
 627
 628        skb_shinfo(skb)->frag_list = compskb;
 629#endif
 630        skb_queue_tail(&dev_net(dev)->wext_nlevents, skb);
 631        schedule_work(&wireless_nlevent_work);
 632}
 633EXPORT_SYMBOL(wireless_send_event);
 634
 635
 636
 637/* IW handlers */
 638
 639struct iw_statistics *get_wireless_stats(struct net_device *dev)
 640{
 641#ifdef CONFIG_WIRELESS_EXT
 642        if ((dev->wireless_handlers != NULL) &&
 643           (dev->wireless_handlers->get_wireless_stats != NULL))
 644                return dev->wireless_handlers->get_wireless_stats(dev);
 645#endif
 646
 647#ifdef CONFIG_CFG80211_WEXT
 648        if (dev->ieee80211_ptr &&
 649            dev->ieee80211_ptr->wiphy &&
 650            dev->ieee80211_ptr->wiphy->wext &&
 651            dev->ieee80211_ptr->wiphy->wext->get_wireless_stats)
 652                return dev->ieee80211_ptr->wiphy->wext->get_wireless_stats(dev);
 653#endif
 654
 655        /* not found */
 656        return NULL;
 657}
 658
 659static int iw_handler_get_iwstats(struct net_device *           dev,
 660                                  struct iw_request_info *      info,
 661                                  union iwreq_data *            wrqu,
 662                                  char *                        extra)
 663{
 664        /* Get stats from the driver */
 665        struct iw_statistics *stats;
 666
 667        stats = get_wireless_stats(dev);
 668        if (stats) {
 669                /* Copy statistics to extra */
 670                memcpy(extra, stats, sizeof(struct iw_statistics));
 671                wrqu->data.length = sizeof(struct iw_statistics);
 672
 673                /* Check if we need to clear the updated flag */
 674                if (wrqu->data.flags != 0)
 675                        stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
 676                return 0;
 677        } else
 678                return -EOPNOTSUPP;
 679}
 680
 681static iw_handler get_handler(struct net_device *dev, unsigned int cmd)
 682{
 683        /* Don't "optimise" the following variable, it will crash */
 684        unsigned int    index;          /* *MUST* be unsigned */
 685        const struct iw_handler_def *handlers = NULL;
 686
 687#ifdef CONFIG_CFG80211_WEXT
 688        if (dev->ieee80211_ptr && dev->ieee80211_ptr->wiphy)
 689                handlers = dev->ieee80211_ptr->wiphy->wext;
 690#endif
 691#ifdef CONFIG_WIRELESS_EXT
 692        if (dev->wireless_handlers)
 693                handlers = dev->wireless_handlers;
 694#endif
 695
 696        if (!handlers)
 697                return NULL;
 698
 699        /* Try as a standard command */
 700        index = IW_IOCTL_IDX(cmd);
 701        if (index < handlers->num_standard)
 702                return handlers->standard[index];
 703
 704#ifdef CONFIG_WEXT_PRIV
 705        /* Try as a private command */
 706        index = cmd - SIOCIWFIRSTPRIV;
 707        if (index < handlers->num_private)
 708                return handlers->private[index];
 709#endif
 710
 711        /* Not found */
 712        return NULL;
 713}
 714
 715static int ioctl_standard_iw_point(struct iw_point *iwp, unsigned int cmd,
 716                                   const struct iw_ioctl_description *descr,
 717                                   iw_handler handler, struct net_device *dev,
 718                                   struct iw_request_info *info)
 719{
 720        int err, extra_size, user_length = 0, essid_compat = 0;
 721        char *extra;
 722
 723        /* Calculate space needed by arguments. Always allocate
 724         * for max space.
 725         */
 726        extra_size = descr->max_tokens * descr->token_size;
 727
 728        /* Check need for ESSID compatibility for WE < 21 */
 729        switch (cmd) {
 730        case SIOCSIWESSID:
 731        case SIOCGIWESSID:
 732        case SIOCSIWNICKN:
 733        case SIOCGIWNICKN:
 734                if (iwp->length == descr->max_tokens + 1)
 735                        essid_compat = 1;
 736                else if (IW_IS_SET(cmd) && (iwp->length != 0)) {
 737                        char essid[IW_ESSID_MAX_SIZE + 1];
 738                        unsigned int len;
 739                        len = iwp->length * descr->token_size;
 740
 741                        if (len > IW_ESSID_MAX_SIZE)
 742                                return -EFAULT;
 743
 744                        err = copy_from_user(essid, iwp->pointer, len);
 745                        if (err)
 746                                return -EFAULT;
 747
 748                        if (essid[iwp->length - 1] == '\0')
 749                                essid_compat = 1;
 750                }
 751                break;
 752        default:
 753                break;
 754        }
 755
 756        iwp->length -= essid_compat;
 757
 758        /* Check what user space is giving us */
 759        if (IW_IS_SET(cmd)) {
 760                /* Check NULL pointer */
 761                if (!iwp->pointer && iwp->length != 0)
 762                        return -EFAULT;
 763                /* Check if number of token fits within bounds */
 764                if (iwp->length > descr->max_tokens)
 765                        return -E2BIG;
 766                if (iwp->length < descr->min_tokens)
 767                        return -EINVAL;
 768        } else {
 769                /* Check NULL pointer */
 770                if (!iwp->pointer)
 771                        return -EFAULT;
 772                /* Save user space buffer size for checking */
 773                user_length = iwp->length;
 774
 775                /* Don't check if user_length > max to allow forward
 776                 * compatibility. The test user_length < min is
 777                 * implied by the test at the end.
 778                 */
 779
 780                /* Support for very large requests */
 781                if ((descr->flags & IW_DESCR_FLAG_NOMAX) &&
 782                    (user_length > descr->max_tokens)) {
 783                        /* Allow userspace to GET more than max so
 784                         * we can support any size GET requests.
 785                         * There is still a limit : -ENOMEM.
 786                         */
 787                        extra_size = user_length * descr->token_size;
 788
 789                        /* Note : user_length is originally a __u16,
 790                         * and token_size is controlled by us,
 791                         * so extra_size won't get negative and
 792                         * won't overflow...
 793                         */
 794                }
 795        }
 796
 797        /* kzalloc() ensures NULL-termination for essid_compat. */
 798        extra = kzalloc(extra_size, GFP_KERNEL);
 799        if (!extra)
 800                return -ENOMEM;
 801
 802        /* If it is a SET, get all the extra data in here */
 803        if (IW_IS_SET(cmd) && (iwp->length != 0)) {
 804                if (copy_from_user(extra, iwp->pointer,
 805                                   iwp->length *
 806                                   descr->token_size)) {
 807                        err = -EFAULT;
 808                        goto out;
 809                }
 810
 811                if (cmd == SIOCSIWENCODEEXT) {
 812                        struct iw_encode_ext *ee = (void *) extra;
 813
 814                        if (iwp->length < sizeof(*ee) + ee->key_len) {
 815                                err = -EFAULT;
 816                                goto out;
 817                        }
 818                }
 819        }
 820
 821        if (IW_IS_GET(cmd) && !(descr->flags & IW_DESCR_FLAG_NOMAX)) {
 822                /*
 823                 * If this is a GET, but not NOMAX, it means that the extra
 824                 * data is not bounded by userspace, but by max_tokens. Thus
 825                 * set the length to max_tokens. This matches the extra data
 826                 * allocation.
 827                 * The driver should fill it with the number of tokens it
 828                 * provided, and it may check iwp->length rather than having
 829                 * knowledge of max_tokens. If the driver doesn't change the
 830                 * iwp->length, this ioctl just copies back max_token tokens
 831                 * filled with zeroes. Hopefully the driver isn't claiming
 832                 * them to be valid data.
 833                 */
 834                iwp->length = descr->max_tokens;
 835        }
 836
 837        err = handler(dev, info, (union iwreq_data *) iwp, extra);
 838
 839        iwp->length += essid_compat;
 840
 841        /* If we have something to return to the user */
 842        if (!err && IW_IS_GET(cmd)) {
 843                /* Check if there is enough buffer up there */
 844                if (user_length < iwp->length) {
 845                        err = -E2BIG;
 846                        goto out;
 847                }
 848
 849                if (copy_to_user(iwp->pointer, extra,
 850                                 iwp->length *
 851                                 descr->token_size)) {
 852                        err = -EFAULT;
 853                        goto out;
 854                }
 855        }
 856
 857        /* Generate an event to notify listeners of the change */
 858        if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
 859            ((err == 0) || (err == -EIWCOMMIT))) {
 860                union iwreq_data *data = (union iwreq_data *) iwp;
 861
 862                if (descr->flags & IW_DESCR_FLAG_RESTRICT)
 863                        /* If the event is restricted, don't
 864                         * export the payload.
 865                         */
 866                        wireless_send_event(dev, cmd, data, NULL);
 867                else
 868                        wireless_send_event(dev, cmd, data, extra);
 869        }
 870
 871out:
 872        kfree(extra);
 873        return err;
 874}
 875
 876/*
 877 * Call the commit handler in the driver
 878 * (if exist and if conditions are right)
 879 *
 880 * Note : our current commit strategy is currently pretty dumb,
 881 * but we will be able to improve on that...
 882 * The goal is to try to agreagate as many changes as possible
 883 * before doing the commit. Drivers that will define a commit handler
 884 * are usually those that need a reset after changing parameters, so
 885 * we want to minimise the number of reset.
 886 * A cool idea is to use a timer : at each "set" command, we re-set the
 887 * timer, when the timer eventually fires, we call the driver.
 888 * Hopefully, more on that later.
 889 *
 890 * Also, I'm waiting to see how many people will complain about the
 891 * netif_running(dev) test. I'm open on that one...
 892 * Hopefully, the driver will remember to do a commit in "open()" ;-)
 893 */
 894int call_commit_handler(struct net_device *dev)
 895{
 896#ifdef CONFIG_WIRELESS_EXT
 897        if ((netif_running(dev)) &&
 898           (dev->wireless_handlers->standard[0] != NULL))
 899                /* Call the commit handler on the driver */
 900                return dev->wireless_handlers->standard[0](dev, NULL,
 901                                                           NULL, NULL);
 902        else
 903                return 0;               /* Command completed successfully */
 904#else
 905        /* cfg80211 has no commit */
 906        return 0;
 907#endif
 908}
 909
 910/*
 911 * Main IOCTl dispatcher.
 912 * Check the type of IOCTL and call the appropriate wrapper...
 913 */
 914static int wireless_process_ioctl(struct net *net, struct ifreq *ifr,
 915                                  unsigned int cmd,
 916                                  struct iw_request_info *info,
 917                                  wext_ioctl_func standard,
 918                                  wext_ioctl_func private)
 919{
 920        struct iwreq *iwr = (struct iwreq *) ifr;
 921        struct net_device *dev;
 922        iw_handler      handler;
 923
 924        /* Permissions are already checked in dev_ioctl() before calling us.
 925         * The copy_to/from_user() of ifr is also dealt with in there */
 926
 927        /* Make sure the device exist */
 928        if ((dev = __dev_get_by_name(net, ifr->ifr_name)) == NULL)
 929                return -ENODEV;
 930
 931        /* A bunch of special cases, then the generic case...
 932         * Note that 'cmd' is already filtered in dev_ioctl() with
 933         * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */
 934        if (cmd == SIOCGIWSTATS)
 935                return standard(dev, iwr, cmd, info,
 936                                &iw_handler_get_iwstats);
 937
 938#ifdef CONFIG_WEXT_PRIV
 939        if (cmd == SIOCGIWPRIV && dev->wireless_handlers)
 940                return standard(dev, iwr, cmd, info,
 941                                iw_handler_get_private);
 942#endif
 943
 944        /* Basic check */
 945        if (!netif_device_present(dev))
 946                return -ENODEV;
 947
 948        /* New driver API : try to find the handler */
 949        handler = get_handler(dev, cmd);
 950        if (handler) {
 951                /* Standard and private are not the same */
 952                if (cmd < SIOCIWFIRSTPRIV)
 953                        return standard(dev, iwr, cmd, info, handler);
 954                else if (private)
 955                        return private(dev, iwr, cmd, info, handler);
 956        }
 957        /* Old driver API : call driver ioctl handler */
 958        if (dev->netdev_ops->ndo_do_ioctl)
 959                return dev->netdev_ops->ndo_do_ioctl(dev, ifr, cmd);
 960        return -EOPNOTSUPP;
 961}
 962
 963/* If command is `set a parameter', or `get the encoding parameters',
 964 * check if the user has the right to do it.
 965 */
 966static int wext_permission_check(unsigned int cmd)
 967{
 968        if ((IW_IS_SET(cmd) || cmd == SIOCGIWENCODE ||
 969             cmd == SIOCGIWENCODEEXT) &&
 970            !capable(CAP_NET_ADMIN))
 971                return -EPERM;
 972
 973        return 0;
 974}
 975
 976/* entry point from dev ioctl */
 977static int wext_ioctl_dispatch(struct net *net, struct ifreq *ifr,
 978                               unsigned int cmd, struct iw_request_info *info,
 979                               wext_ioctl_func standard,
 980                               wext_ioctl_func private)
 981{
 982        int ret = wext_permission_check(cmd);
 983
 984        if (ret)
 985                return ret;
 986
 987        dev_load(net, ifr->ifr_name);
 988        rtnl_lock();
 989        ret = wireless_process_ioctl(net, ifr, cmd, info, standard, private);
 990        rtnl_unlock();
 991
 992        return ret;
 993}
 994
 995/*
 996 * Wrapper to call a standard Wireless Extension handler.
 997 * We do various checks and also take care of moving data between
 998 * user space and kernel space.
 999 */
1000static int ioctl_standard_call(struct net_device *      dev,

1001                               struct iwreq             *iwr,
1002                               unsigned int             cmd,
1003                               struct iw_request_info   *info,
1004                               iw_handler               handler)
1005{
1006        const struct iw_ioctl_description *     descr;
1007        int                                     ret = -EINVAL;
1008
1009        /* Get the description of the IOCTL */
1010        if (IW_IOCTL_IDX(cmd) >= standard_ioctl_num)
1011                return -EOPNOTSUPP;
1012        descr = &(standard_ioctl[IW_IOCTL_IDX(cmd)]);
1013
1014        /* Check if we have a pointer to user space data or not */
1015        if (descr->header_type != IW_HEADER_TYPE_POINT) {
1016
1017                /* No extra arguments. Trivial to handle */
1018                ret = handler(dev, info, &(iwr->u), NULL);
1019
1020                /* Generate an event to notify listeners of the change */
1021                if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
1022                   ((ret == 0) || (ret == -EIWCOMMIT)))
1023                        wireless_send_event(dev, cmd, &(iwr->u), NULL);
1024        } else {
1025                ret = ioctl_standard_iw_point(&iwr->u.data, cmd, descr,
1026                                              handler, dev, info);
1027        }
1028
1029        /* Call commit handler if needed and defined */
1030        if (ret == -EIWCOMMIT)
1031                ret = call_commit_handler(dev);
1032
1033        /* Here, we will generate the appropriate event if needed */
1034
1035        return ret;
1036}
1037
1038
1039int wext_handle_ioctl(struct net *net, struct ifreq *ifr, unsigned int cmd,
1040                      void __user *arg)
1041{
1042        struct iw_request_info info = { .cmd = cmd, .flags = 0 };
1043        int ret;
1044
1045        ret = wext_ioctl_dispatch(net, ifr, cmd, &info,
1046                                  ioctl_standard_call,
1047                                  ioctl_private_call);
1048        if (ret >= 0 &&
1049            IW_IS_GET(cmd) &&
1050            copy_to_user(arg, ifr, sizeof(struct iwreq)))
1051                return -EFAULT;
1052
1053        return ret;
1054}
1055
1056#ifdef CONFIG_COMPAT
1057static int compat_standard_call(struct net_device       *dev,
1058                                struct iwreq            *iwr,
1059                                unsigned int            cmd,
1060                                struct iw_request_info  *info,
1061                                iw_handler              handler)
1062{
1063        const struct iw_ioctl_description *descr;
1064        struct compat_iw_point *iwp_compat;
1065        struct iw_point iwp;
1066        int err;
1067
1068        descr = standard_ioctl + IW_IOCTL_IDX(cmd);
1069
1070        if (descr->header_type != IW_HEADER_TYPE_POINT)
1071                return ioctl_standard_call(dev, iwr, cmd, info, handler);
1072
1073        iwp_compat = (struct compat_iw_point *) &iwr->u.data;
1074        iwp.pointer = compat_ptr(iwp_compat->pointer);
1075        iwp.length = iwp_compat->length;
1076        iwp.flags = iwp_compat->flags;
1077
1078        err = ioctl_standard_iw_point(&iwp, cmd, descr, handler, dev, info);
1079
1080        iwp_compat->pointer = ptr_to_compat(iwp.pointer);
1081        iwp_compat->length = iwp.length;
1082        iwp_compat->flags = iwp.flags;
1083
1084        return err;
1085}
1086
1087int compat_wext_handle_ioctl(struct net *net, unsigned int cmd,
1088                             unsigned long arg)
1089{
1090        void __user *argp = (void __user *)arg;
1091        struct iw_request_info info;
1092        struct iwreq iwr;
1093        char *colon;
1094        int ret;
1095
1096        if (copy_from_user(&iwr, argp, sizeof(struct iwreq)))
1097                return -EFAULT;
1098
1099        iwr.ifr_name[IFNAMSIZ-1] = 0;
1100        colon = strchr(iwr.ifr_name, ':');
1101        if (colon)
1102                *colon = 0;
1103
1104        info.cmd = cmd;
1105        info.flags = IW_REQUEST_FLAG_COMPAT;
1106
1107        ret = wext_ioctl_dispatch(net, (struct ifreq *) &iwr, cmd, &info,
1108                                  compat_standard_call,
1109                                  compat_private_call);
1110
1111        if (ret >= 0 &&
1112            IW_IS_GET(cmd) &&
1113            copy_to_user(argp, &iwr, sizeof(struct iwreq)))
1114                return -EFAULT;
1115
1116        return ret;
1117}
1118#endif
1119