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        err = register_netdevice_notifier(&wext_netdev_notifier);
 403        if (err)
 404                unregister_pernet_subsys(&wext_pernet_ops);
 405        return err;
 406}
 407
 408subsys_initcall(wireless_nlevent_init);
 409
 410/* Process events generated by the wireless layer or the driver. */
 411static void wireless_nlevent_process(struct work_struct *work)
 412{
 413        rtnl_lock();
 414        wireless_nlevent_flush();
 415        rtnl_unlock();
 416}
 417
 418static DECLARE_WORK(wireless_nlevent_work, wireless_nlevent_process);
 419
 420static struct nlmsghdr *rtnetlink_ifinfo_prep(struct net_device *dev,
 421                                              struct sk_buff *skb)
 422{
 423        struct ifinfomsg *r;
 424        struct nlmsghdr  *nlh;
 425
 426        nlh = nlmsg_put(skb, 0, 0, RTM_NEWLINK, sizeof(*r), 0);
 427        if (!nlh)
 428                return NULL;
 429
 430        r = nlmsg_data(nlh);
 431        r->ifi_family = AF_UNSPEC;
 432        r->__ifi_pad = 0;
 433        r->ifi_type = dev->type;
 434        r->ifi_index = dev->ifindex;
 435        r->ifi_flags = dev_get_flags(dev);
 436        r->ifi_change = 0;      /* Wireless changes don't affect those flags */
 437
 438        if (nla_put_string(skb, IFLA_IFNAME, dev->name))
 439                goto nla_put_failure;
 440
 441        return nlh;
 442 nla_put_failure:
 443        nlmsg_cancel(skb, nlh);
 444        return NULL;
 445}
 446
 447
 448/*
 449 * Main event dispatcher. Called from other parts and drivers.
 450 * Send the event on the appropriate channels.
 451 * May be called from interrupt context.
 452 */
 453void wireless_send_event(struct net_device *    dev,
 454                         unsigned int           cmd,
 455                         union iwreq_data *     wrqu,
 456                         const char *           extra)
 457{
 458        const struct iw_ioctl_description *     descr = NULL;
 459        int extra_len = 0;
 460        struct iw_event  *event;                /* Mallocated whole event */
 461        int event_len;                          /* Its size */
 462        int hdr_len;                            /* Size of the event header */
 463        int wrqu_off = 0;                       /* Offset in wrqu */
 464        /* Don't "optimise" the following variable, it will crash */
 465        unsigned int    cmd_index;              /* *MUST* be unsigned */
 466        struct sk_buff *skb;
 467        struct nlmsghdr *nlh;
 468        struct nlattr *nla;
 469#ifdef CONFIG_COMPAT
 470        struct __compat_iw_event *compat_event;
 471        struct compat_iw_point compat_wrqu;
 472        struct sk_buff *compskb;
 473#endif
 474
 475        /*
 476         * Nothing in the kernel sends scan events with data, be safe.
 477         * This is necessary because we cannot fix up scan event data
 478         * for compat, due to being contained in 'extra', but normally
 479         * applications are required to retrieve the scan data anyway
 480         * and no data is included in the event, this codifies that
 481         * practice.
 482         */
 483        if (WARN_ON(cmd == SIOCGIWSCAN && extra))
 484                extra = NULL;
 485
 486        /* Get the description of the Event */
 487        if (cmd <= SIOCIWLAST) {
 488                cmd_index = IW_IOCTL_IDX(cmd);
 489                if (cmd_index < standard_ioctl_num)
 490                        descr = &(standard_ioctl[cmd_index]);
 491        } else {
 492                cmd_index = IW_EVENT_IDX(cmd);
 493                if (cmd_index < standard_event_num)
 494                        descr = &(standard_event[cmd_index]);
 495        }
 496        /* Don't accept unknown events */
 497        if (descr == NULL) {
 498                /* Note : we don't return an error to the driver, because
 499                 * the driver would not know what to do about it. It can't
 500                 * return an error to the user, because the event is not
 501                 * initiated by a user request.
 502                 * The best the driver could do is to log an error message.
 503                 * We will do it ourselves instead...
 504                 */
 505                netdev_err(dev, "(WE) : Invalid/Unknown Wireless Event (0x%04X)\n",
 506                           cmd);
 507                return;
 508        }
 509
 510        /* Check extra parameters and set extra_len */
 511        if (descr->header_type == IW_HEADER_TYPE_POINT) {
 512                /* Check if number of token fits within bounds */
 513                if (wrqu->data.length > descr->max_tokens) {
 514                        netdev_err(dev, "(WE) : Wireless Event (cmd=0x%04X) too big (%d)\n",
 515                                   cmd, wrqu->data.length);
 516                        return;
 517                }
 518                if (wrqu->data.length < descr->min_tokens) {
 519                        netdev_err(dev, "(WE) : Wireless Event (cmd=0x%04X) too small (%d)\n",
 520                                   cmd, wrqu->data.length);
 521                        return;
 522                }
 523                /* Calculate extra_len - extra is NULL for restricted events */
 524                if (extra != NULL)
 525                        extra_len = wrqu->data.length * descr->token_size;
 526                /* Always at an offset in wrqu */
 527                wrqu_off = IW_EV_POINT_OFF;
 528        }
 529
 530        /* Total length of the event */
 531        hdr_len = event_type_size[descr->header_type];
 532        event_len = hdr_len + extra_len;
 533
 534        /*
 535         * The problem for 64/32 bit.
 536         *
 537         * On 64-bit, a regular event is laid out as follows:
 538         *      |  0  |  1  |  2  |  3  |  4  |  5  |  6  |  7  |
 539         *      | event.len | event.cmd |     p a d d i n g     |
 540         *      | wrqu data ... (with the correct size)         |
 541         *
 542         * This padding exists because we manipulate event->u,
 543         * and 'event' is not packed.
 544         *
 545         * An iw_point event is laid out like this instead:
 546         *      |  0  |  1  |  2  |  3  |  4  |  5  |  6  |  7  |
 547         *      | event.len | event.cmd |     p a d d i n g     |
 548         *      | iwpnt.len | iwpnt.flg |     p a d d i n g     |
 549         *      | extra data  ...
 550         *
 551         * The second padding exists because struct iw_point is extended,
 552         * but this depends on the platform...
 553         *
 554         * On 32-bit, all the padding shouldn't be there.
 555         */
 556
 557        skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
 558        if (!skb)
 559                return;
 560
 561        /* Send via the RtNetlink event channel */
 562        nlh = rtnetlink_ifinfo_prep(dev, skb);
 563        if (WARN_ON(!nlh)) {
 564                kfree_skb(skb);
 565                return;
 566        }
 567
 568        /* Add the wireless events in the netlink packet */
 569        nla = nla_reserve(skb, IFLA_WIRELESS, event_len);
 570        if (!nla) {
 571                kfree_skb(skb);
 572                return;
 573        }
 574        event = nla_data(nla);
 575
 576        /* Fill event - first clear to avoid data leaking */
 577        memset(event, 0, hdr_len);
 578        event->len = event_len;
 579        event->cmd = cmd;
 580        memcpy(&event->u, ((char *) wrqu) + wrqu_off, hdr_len - IW_EV_LCP_LEN);
 581        if (extra_len)
 582                memcpy(((char *) event) + hdr_len, extra, extra_len);
 583
 584        nlmsg_end(skb, nlh);
 585#ifdef CONFIG_COMPAT
 586        hdr_len = compat_event_type_size[descr->header_type];
 587        event_len = hdr_len + extra_len;
 588
 589        compskb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
 590        if (!compskb) {
 591                kfree_skb(skb);
 592                return;
 593        }
 594
 595        /* Send via the RtNetlink event channel */
 596        nlh = rtnetlink_ifinfo_prep(dev, compskb);
 597        if (WARN_ON(!nlh)) {
 598                kfree_skb(skb);
 599                kfree_skb(compskb);
 600                return;
 601        }
 602
 603        /* Add the wireless events in the netlink packet */
 604        nla = nla_reserve(compskb, IFLA_WIRELESS, event_len);
 605        if (!nla) {
 606                kfree_skb(skb);
 607                kfree_skb(compskb);
 608                return;
 609        }
 610        compat_event = nla_data(nla);
 611
 612        compat_event->len = event_len;
 613        compat_event->cmd = cmd;
 614        if (descr->header_type == IW_HEADER_TYPE_POINT) {
 615                compat_wrqu.length = wrqu->data.length;
 616                compat_wrqu.flags = wrqu->data.flags;
 617                memcpy(&compat_event->pointer,
 618                        ((char *) &compat_wrqu) + IW_EV_COMPAT_POINT_OFF,
 619                        hdr_len - IW_EV_COMPAT_LCP_LEN);
 620                if (extra_len)
 621                        memcpy(((char *) compat_event) + hdr_len,
 622                                extra, extra_len);
 623        } else {
 624                /* extra_len must be zero, so no if (extra) needed */
 625                memcpy(&compat_event->pointer, wrqu,
 626                        hdr_len - IW_EV_COMPAT_LCP_LEN);
 627        }
 628
 629        nlmsg_end(compskb, nlh);
 630
 631        skb_shinfo(skb)->frag_list = compskb;
 632#endif
 633        skb_queue_tail(&dev_net(dev)->wext_nlevents, skb);
 634        schedule_work(&wireless_nlevent_work);
 635}
 636EXPORT_SYMBOL(wireless_send_event);
 637
 638
 639
 640/* IW handlers */
 641
 642struct iw_statistics *get_wireless_stats(struct net_device *dev)
 643{
 644#ifdef CONFIG_WIRELESS_EXT
 645        if ((dev->wireless_handlers != NULL) &&
 646           (dev->wireless_handlers->get_wireless_stats != NULL))
 647                return dev->wireless_handlers->get_wireless_stats(dev);
 648#endif
 649
 650#ifdef CONFIG_CFG80211_WEXT
 651        if (dev->ieee80211_ptr &&
 652            dev->ieee80211_ptr->wiphy &&
 653            dev->ieee80211_ptr->wiphy->wext &&
 654            dev->ieee80211_ptr->wiphy->wext->get_wireless_stats)
 655                return dev->ieee80211_ptr->wiphy->wext->get_wireless_stats(dev);
 656#endif
 657
 658        /* not found */
 659        return NULL;
 660}
 661
 662static int iw_handler_get_iwstats(struct net_device *           dev,
 663                                  struct iw_request_info *      info,
 664                                  union iwreq_data *            wrqu,
 665                                  char *                        extra)
 666{
 667        /* Get stats from the driver */
 668        struct iw_statistics *stats;
 669
 670        stats = get_wireless_stats(dev);
 671        if (stats) {
 672                /* Copy statistics to extra */
 673                memcpy(extra, stats, sizeof(struct iw_statistics));
 674                wrqu->data.length = sizeof(struct iw_statistics);
 675
 676                /* Check if we need to clear the updated flag */
 677                if (wrqu->data.flags != 0)
 678                        stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
 679                return 0;
 680        } else
 681                return -EOPNOTSUPP;
 682}
 683
 684static iw_handler get_handler(struct net_device *dev, unsigned int cmd)
 685{
 686        /* Don't "optimise" the following variable, it will crash */
 687        unsigned int    index;          /* *MUST* be unsigned */
 688        const struct iw_handler_def *handlers = NULL;
 689
 690#ifdef CONFIG_CFG80211_WEXT
 691        if (dev->ieee80211_ptr && dev->ieee80211_ptr->wiphy)
 692                handlers = dev->ieee80211_ptr->wiphy->wext;
 693#endif
 694#ifdef CONFIG_WIRELESS_EXT
 695        if (dev->wireless_handlers)
 696                handlers = dev->wireless_handlers;
 697#endif
 698
 699        if (!handlers)
 700                return NULL;
 701
 702        /* Try as a standard command */
 703        index = IW_IOCTL_IDX(cmd);
 704        if (index < handlers->num_standard)
 705                return handlers->standard[index];
 706
 707#ifdef CONFIG_WEXT_PRIV
 708        /* Try as a private command */
 709        index = cmd - SIOCIWFIRSTPRIV;
 710        if (index < handlers->num_private)
 711                return handlers->private[index];
 712#endif
 713
 714        /* Not found */
 715        return NULL;
 716}
 717
 718static int ioctl_standard_iw_point(struct iw_point *iwp, unsigned int cmd,
 719                                   const struct iw_ioctl_description *descr,
 720                                   iw_handler handler, struct net_device *dev,
 721                                   struct iw_request_info *info)
 722{
 723        int err, extra_size, user_length = 0, essid_compat = 0;
 724        char *extra;
 725
 726        /* Calculate space needed by arguments. Always allocate
 727         * for max space.
 728         */
 729        extra_size = descr->max_tokens * descr->token_size;
 730
 731        /* Check need for ESSID compatibility for WE < 21 */
 732        switch (cmd) {
 733        case SIOCSIWESSID:
 734        case SIOCGIWESSID:
 735        case SIOCSIWNICKN:
 736        case SIOCGIWNICKN:
 737                if (iwp->length == descr->max_tokens + 1)
 738                        essid_compat = 1;
 739                else if (IW_IS_SET(cmd) && (iwp->length != 0)) {
 740                        char essid[IW_ESSID_MAX_SIZE + 1];
 741                        unsigned int len;
 742                        len = iwp->length * descr->token_size;
 743
 744                        if (len > IW_ESSID_MAX_SIZE)
 745                                return -EFAULT;
 746
 747                        err = copy_from_user(essid, iwp->pointer, len);
 748                        if (err)
 749                                return -EFAULT;
 750
 751                        if (essid[iwp->length - 1] == '\0')
 752                                essid_compat = 1;
 753                }
 754                break;
 755        default:
 756                break;
 757        }
 758
 759        iwp->length -= essid_compat;
 760
 761        /* Check what user space is giving us */
 762        if (IW_IS_SET(cmd)) {
 763                /* Check NULL pointer */
 764                if (!iwp->pointer && iwp->length != 0)
 765                        return -EFAULT;
 766                /* Check if number of token fits within bounds */
 767                if (iwp->length > descr->max_tokens)
 768                        return -E2BIG;
 769                if (iwp->length < descr->min_tokens)
 770                        return -EINVAL;
 771        } else {
 772                /* Check NULL pointer */
 773                if (!iwp->pointer)
 774                        return -EFAULT;
 775                /* Save user space buffer size for checking */
 776                user_length = iwp->length;
 777
 778                /* Don't check if user_length > max to allow forward
 779                 * compatibility. The test user_length < min is
 780                 * implied by the test at the end.
 781                 */
 782
 783                /* Support for very large requests */
 784                if ((descr->flags & IW_DESCR_FLAG_NOMAX) &&
 785                    (user_length > descr->max_tokens)) {
 786                        /* Allow userspace to GET more than max so
 787                         * we can support any size GET requests.
 788                         * There is still a limit : -ENOMEM.
 789                         */
 790                        extra_size = user_length * descr->token_size;
 791
 792                        /* Note : user_length is originally a __u16,
 793                         * and token_size is controlled by us,
 794                         * so extra_size won't get negative and
 795                         * won't overflow...
 796                         */
 797                }
 798        }
 799
 800        /* kzalloc() ensures NULL-termination for essid_compat. */
 801        extra = kzalloc(extra_size, GFP_KERNEL);
 802        if (!extra)
 803                return -ENOMEM;
 804
 805        /* If it is a SET, get all the extra data in here */
 806        if (IW_IS_SET(cmd) && (iwp->length != 0)) {
 807                if (copy_from_user(extra, iwp->pointer,
 808                                   iwp->length *
 809                                   descr->token_size)) {
 810                        err = -EFAULT;
 811                        goto out;
 812                }
 813
 814                if (cmd == SIOCSIWENCODEEXT) {
 815                        struct iw_encode_ext *ee = (void *) extra;
 816
 817                        if (iwp->length < sizeof(*ee) + ee->key_len) {
 818                                err = -EFAULT;
 819                                goto out;
 820                        }
 821                }
 822        }
 823
 824        if (IW_IS_GET(cmd) && !(descr->flags & IW_DESCR_FLAG_NOMAX)) {
 825                /*
 826                 * If this is a GET, but not NOMAX, it means that the extra
 827                 * data is not bounded by userspace, but by max_tokens. Thus
 828                 * set the length to max_tokens. This matches the extra data
 829                 * allocation.
 830                 * The driver should fill it with the number of tokens it
 831                 * provided, and it may check iwp->length rather than having
 832                 * knowledge of max_tokens. If the driver doesn't change the
 833                 * iwp->length, this ioctl just copies back max_token tokens
 834                 * filled with zeroes. Hopefully the driver isn't claiming
 835                 * them to be valid data.
 836                 */
 837                iwp->length = descr->max_tokens;
 838        }
 839
 840        err = handler(dev, info, (union iwreq_data *) iwp, extra);
 841
 842        iwp->length += essid_compat;
 843
 844        /* If we have something to return to the user */
 845        if (!err && IW_IS_GET(cmd)) {
 846                /* Check if there is enough buffer up there */
 847                if (user_length < iwp->length) {
 848                        err = -E2BIG;
 849                        goto out;
 850                }
 851
 852                if (copy_to_user(iwp->pointer, extra,
 853                                 iwp->length *
 854                                 descr->token_size)) {
 855                        err = -EFAULT;
 856                        goto out;
 857                }
 858        }
 859
 860        /* Generate an event to notify listeners of the change */
 861        if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
 862            ((err == 0) || (err == -EIWCOMMIT))) {
 863                union iwreq_data *data = (union iwreq_data *) iwp;
 864
 865                if (descr->flags & IW_DESCR_FLAG_RESTRICT)
 866                        /* If the event is restricted, don't
 867                         * export the payload.
 868                         */
 869                        wireless_send_event(dev, cmd, data, NULL);
 870                else
 871                        wireless_send_event(dev, cmd, data, extra);
 872        }
 873
 874out:
 875        kfree(extra);
 876        return err;
 877}
 878
 879/*
 880 * Call the commit handler in the driver
 881 * (if exist and if conditions are right)
 882 *
 883 * Note : our current commit strategy is currently pretty dumb,
 884 * but we will be able to improve on that...
 885 * The goal is to try to agreagate as many changes as possible
 886 * before doing the commit. Drivers that will define a commit handler
 887 * are usually those that need a reset after changing parameters, so
 888 * we want to minimise the number of reset.
 889 * A cool idea is to use a timer : at each "set" command, we re-set the
 890 * timer, when the timer eventually fires, we call the driver.
 891 * Hopefully, more on that later.
 892 *
 893 * Also, I'm waiting to see how many people will complain about the
 894 * netif_running(dev) test. I'm open on that one...
 895 * Hopefully, the driver will remember to do a commit in "open()" ;-)
 896 */
 897int call_commit_handler(struct net_device *dev)
 898{
 899#ifdef CONFIG_WIRELESS_EXT
 900        if ((netif_running(dev)) &&
 901           (dev->wireless_handlers->standard[0] != NULL))
 902                /* Call the commit handler on the driver */
 903                return dev->wireless_handlers->standard[0](dev, NULL,
 904                                                           NULL, NULL);
 905        else
 906                return 0;               /* Command completed successfully */
 907#else
 908        /* cfg80211 has no commit */
 909        return 0;
 910#endif
 911}
 912
 913/*
 914 * Main IOCTl dispatcher.
 915 * Check the type of IOCTL and call the appropriate wrapper...
 916 */
 917static int wireless_process_ioctl(struct net *net, struct iwreq *iwr,
 918                                  unsigned int cmd,
 919                                  struct iw_request_info *info,
 920                                  wext_ioctl_func standard,
 921                                  wext_ioctl_func private)
 922{
 923        struct net_device *dev;
 924        iw_handler      handler;
 925
 926        /* Permissions are already checked in dev_ioctl() before calling us.
 927         * The copy_to/from_user() of ifr is also dealt with in there */
 928
 929        /* Make sure the device exist */
 930        if ((dev = __dev_get_by_name(net, iwr->ifr_name)) == NULL)
 931                return -ENODEV;
 932
 933        /* A bunch of special cases, then the generic case...
 934         * Note that 'cmd' is already filtered in dev_ioctl() with
 935         * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */
 936        if (cmd == SIOCGIWSTATS)
 937                return standard(dev, iwr, cmd, info,
 938                                &iw_handler_get_iwstats);
 939
 940#ifdef CONFIG_WEXT_PRIV
 941        if (cmd == SIOCGIWPRIV && dev->wireless_handlers)
 942                return standard(dev, iwr, cmd, info,
 943                                iw_handler_get_private);
 944#endif
 945
 946        /* Basic check */
 947        if (!netif_device_present(dev))
 948                return -ENODEV;
 949
 950        /* New driver API : try to find the handler */
 951        handler = get_handler(dev, cmd);
 952        if (handler) {
 953                /* Standard and private are not the same */
 954                if (cmd < SIOCIWFIRSTPRIV)
 955                        return standard(dev, iwr, cmd, info, handler);
 956                else if (private)
 957                        return private(dev, iwr, cmd, info, handler);
 958        }
 959        return -EOPNOTSUPP;
 960}
 961
 962/* If command is `set a parameter', or `get the encoding parameters',
 963 * check if the user has the right to do it.
 964 */
 965static int wext_permission_check(unsigned int cmd)
 966{
 967        if ((IW_IS_SET(cmd) || cmd == SIOCGIWENCODE ||
 968             cmd == SIOCGIWENCODEEXT) &&
 969            !capable(CAP_NET_ADMIN))
 970                return -EPERM;
 971
 972        return 0;
 973}
 974
 975/* entry point from dev ioctl */
 976static int wext_ioctl_dispatch(struct net *net, struct iwreq *iwr,
 977                               unsigned int cmd, struct iw_request_info *info,
 978                               wext_ioctl_func standard,
 979                               wext_ioctl_func private)
 980{
 981        int ret = wext_permission_check(cmd);
 982
 983        if (ret)
 984                return ret;
 985
 986        dev_load(net, iwr->ifr_name);
 987        rtnl_lock();
 988        ret = wireless_process_ioctl(net, iwr, cmd, info, standard, private);
 989        rtnl_unlock();
 990
 991        return ret;
 992}
 993
 994/*
 995 * Wrapper to call a standard Wireless Extension handler.
 996 * We do various checks and also take care of moving data between
 997 * user space and kernel space.
 998 */
 999static int ioctl_standard_call(struct net_device *      dev,
1000                               struct iwreq             *iwr,

1001                               unsigned int             cmd,
1002                               struct iw_request_info   *info,
1003                               iw_handler               handler)
1004{
1005        const struct iw_ioctl_description *     descr;
1006        int                                     ret = -EINVAL;
1007
1008        /* Get the description of the IOCTL */
1009        if (IW_IOCTL_IDX(cmd) >= standard_ioctl_num)
1010                return -EOPNOTSUPP;
1011        descr = &(standard_ioctl[IW_IOCTL_IDX(cmd)]);
1012
1013        /* Check if we have a pointer to user space data or not */
1014        if (descr->header_type != IW_HEADER_TYPE_POINT) {
1015
1016                /* No extra arguments. Trivial to handle */
1017                ret = handler(dev, info, &(iwr->u), NULL);
1018
1019                /* Generate an event to notify listeners of the change */
1020                if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
1021                   ((ret == 0) || (ret == -EIWCOMMIT)))
1022                        wireless_send_event(dev, cmd, &(iwr->u), NULL);
1023        } else {
1024                ret = ioctl_standard_iw_point(&iwr->u.data, cmd, descr,
1025                                              handler, dev, info);
1026        }
1027
1028        /* Call commit handler if needed and defined */
1029        if (ret == -EIWCOMMIT)
1030                ret = call_commit_handler(dev);
1031
1032        /* Here, we will generate the appropriate event if needed */
1033
1034        return ret;
1035}
1036
1037
1038int wext_handle_ioctl(struct net *net, struct iwreq *iwr, unsigned int cmd,
1039                      void __user *arg)
1040{
1041        struct iw_request_info info = { .cmd = cmd, .flags = 0 };
1042        int ret;
1043
1044        ret = wext_ioctl_dispatch(net, iwr, cmd, &info,
1045                                  ioctl_standard_call,
1046                                  ioctl_private_call);
1047        if (ret >= 0 &&
1048            IW_IS_GET(cmd) &&
1049            copy_to_user(arg, iwr, sizeof(struct iwreq)))
1050                return -EFAULT;
1051
1052        return ret;
1053}
1054
1055#ifdef CONFIG_COMPAT
1056static int compat_standard_call(struct net_device       *dev,
1057                                struct iwreq            *iwr,
1058                                unsigned int            cmd,
1059                                struct iw_request_info  *info,
1060                                iw_handler              handler)
1061{
1062        const struct iw_ioctl_description *descr;
1063        struct compat_iw_point *iwp_compat;
1064        struct iw_point iwp;
1065        int err;
1066
1067        descr = standard_ioctl + IW_IOCTL_IDX(cmd);
1068
1069        if (descr->header_type != IW_HEADER_TYPE_POINT)
1070                return ioctl_standard_call(dev, iwr, cmd, info, handler);
1071
1072        iwp_compat = (struct compat_iw_point *) &iwr->u.data;
1073        iwp.pointer = compat_ptr(iwp_compat->pointer);
1074        iwp.length = iwp_compat->length;
1075        iwp.flags = iwp_compat->flags;
1076
1077        err = ioctl_standard_iw_point(&iwp, cmd, descr, handler, dev, info);
1078
1079        iwp_compat->pointer = ptr_to_compat(iwp.pointer);
1080        iwp_compat->length = iwp.length;
1081        iwp_compat->flags = iwp.flags;
1082
1083        return err;
1084}
1085
1086int compat_wext_handle_ioctl(struct net *net, unsigned int cmd,
1087                             unsigned long arg)
1088{
1089        void __user *argp = (void __user *)arg;
1090        struct iw_request_info info;
1091        struct iwreq iwr;
1092        char *colon;
1093        int ret;
1094
1095        if (copy_from_user(&iwr, argp, sizeof(struct iwreq)))
1096                return -EFAULT;
1097
1098        iwr.ifr_name[IFNAMSIZ-1] = 0;
1099        colon = strchr(iwr.ifr_name, ':');
1100        if (colon)
1101                *colon = 0;
1102
1103        info.cmd = cmd;
1104        info.flags = IW_REQUEST_FLAG_COMPAT;
1105
1106        ret = wext_ioctl_dispatch(net, &iwr, cmd, &info,
1107                                  compat_standard_call,
1108                                  compat_private_call);
1109
1110        if (ret >= 0 &&
1111            IW_IS_GET(cmd) &&
1112            copy_to_user(argp, &iwr, sizeof(struct iwreq)))
1113                return -EFAULT;
1114
1115        return ret;
1116}
1117#endif
1118
1119char *iwe_stream_add_event(struct iw_request_info *info, char *stream,
1120                           char *ends, struct iw_event *iwe, int event_len)
1121{
1122        int lcp_len = iwe_stream_lcp_len(info);
1123
1124        event_len = iwe_stream_event_len_adjust(info, event_len);
1125
1126        /* Check if it's possible */
1127        if (likely((stream + event_len) < ends)) {
1128                iwe->len = event_len;
1129                /* Beware of alignement issues on 64 bits */
1130                memcpy(stream, (char *) iwe, IW_EV_LCP_PK_LEN);
1131                memcpy(stream + lcp_len, &iwe->u,
1132                       event_len - lcp_len);
1133                stream += event_len;
1134        }
1135
1136        return stream;
1137}
1138EXPORT_SYMBOL(iwe_stream_add_event);
1139
1140char *iwe_stream_add_point(struct iw_request_info *info, char *stream,
1141                           char *ends, struct iw_event *iwe, char *extra)
1142{
1143        int event_len = iwe_stream_point_len(info) + iwe->u.data.length;
1144        int point_len = iwe_stream_point_len(info);
1145        int lcp_len   = iwe_stream_lcp_len(info);
1146
1147        /* Check if it's possible */
1148        if (likely((stream + event_len) < ends)) {
1149                iwe->len = event_len;
1150                memcpy(stream, (char *) iwe, IW_EV_LCP_PK_LEN);
1151                memcpy(stream + lcp_len,
1152                       ((char *) &iwe->u) + IW_EV_POINT_OFF,
1153                       IW_EV_POINT_PK_LEN - IW_EV_LCP_PK_LEN);
1154                if (iwe->u.data.length && extra)
1155                        memcpy(stream + point_len, extra, iwe->u.data.length);
1156                stream += event_len;
1157        }
1158
1159        return stream;
1160}
1161EXPORT_SYMBOL(iwe_stream_add_point);
1162
1163char *iwe_stream_add_value(struct iw_request_info *info, char *event,
1164                           char *value, char *ends, struct iw_event *iwe,
1165                           int event_len)
1166{
1167        int lcp_len = iwe_stream_lcp_len(info);
1168
1169        /* Don't duplicate LCP */
1170        event_len -= IW_EV_LCP_LEN;
1171
1172        /* Check if it's possible */
1173        if (likely((value + event_len) < ends)) {
1174                /* Add new value */
1175                memcpy(value, &iwe->u, event_len);
1176                value += event_len;
1177                /* Patch LCP */
1178                iwe->len = value - event;
1179                memcpy(event, (char *) iwe, lcp_len);
1180        }
1181
1182        return value;
1183}
1184EXPORT_SYMBOL(iwe_stream_add_value);
1185