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/wireless.h>
  14 #include <linux/uaccess.h>
  15 #include <net/cfg80211.h>
  16 #include <net/iw_handler.h>
  17 #include <net/netlink.h>
  18 #include <net/wext.h>
  19 #include <net/net_namespace.h>
  20
  21 typedef int (*wext_ioctl_func)(struct net_device *, struct iwreq *,
  22                                unsigned int, struct iw_request_info *,
  23                                iw_handler);
  24
  25
  26 /*
  27  * Meta-data about all the standard Wireless Extension request we
  28  * know about.
  29  */
  30 static const struct iw_ioctl_description standard_ioctl[] = {
  31         [SIOCSIWCOMMIT  - SIOCIWFIRST] = {
  32                 .header_type    = IW_HEADER_TYPE_NULL,
  33         },
  34         [SIOCGIWNAME    - SIOCIWFIRST] = {
  35                 .header_type    = IW_HEADER_TYPE_CHAR,
  36                 .flags          = IW_DESCR_FLAG_DUMP,
  37         },
  38         [SIOCSIWNWID    - SIOCIWFIRST] = {
  39                 .header_type    = IW_HEADER_TYPE_PARAM,
  40                 .flags          = IW_DESCR_FLAG_EVENT,
  41         },
  42         [SIOCGIWNWID    - SIOCIWFIRST] = {
  43                 .header_type    = IW_HEADER_TYPE_PARAM,
  44                 .flags          = IW_DESCR_FLAG_DUMP,
  45         },
  46         [SIOCSIWFREQ    - SIOCIWFIRST] = {
  47                 .header_type    = IW_HEADER_TYPE_FREQ,
  48                 .flags          = IW_DESCR_FLAG_EVENT,
  49         },
  50         [SIOCGIWFREQ    - SIOCIWFIRST] = {
  51                 .header_type    = IW_HEADER_TYPE_FREQ,
  52                 .flags          = IW_DESCR_FLAG_DUMP,
  53         },
  54         [SIOCSIWMODE    - SIOCIWFIRST] = {
  55                 .header_type    = IW_HEADER_TYPE_UINT,
  56                 .flags          = IW_DESCR_FLAG_EVENT,
  57         },
  58         [SIOCGIWMODE    - SIOCIWFIRST] = {
  59                 .header_type    = IW_HEADER_TYPE_UINT,
  60                 .flags          = IW_DESCR_FLAG_DUMP,
  61         },
  62         [SIOCSIWSENS    - SIOCIWFIRST] = {
  63                 .header_type    = IW_HEADER_TYPE_PARAM,
  64         },
  65         [SIOCGIWSENS    - SIOCIWFIRST] = {
  66                 .header_type    = IW_HEADER_TYPE_PARAM,
  67         },
  68         [SIOCSIWRANGE   - SIOCIWFIRST] = {
  69                 .header_type    = IW_HEADER_TYPE_NULL,
  70         },
  71         [SIOCGIWRANGE   - SIOCIWFIRST] = {
  72                 .header_type    = IW_HEADER_TYPE_POINT,
  73                 .token_size     = 1,
  74                 .max_tokens     = sizeof(struct iw_range),
  75                 .flags          = IW_DESCR_FLAG_DUMP,
  76         },
  77         [SIOCSIWPRIV    - SIOCIWFIRST] = {
  78                 .header_type    = IW_HEADER_TYPE_NULL,
  79         },
  80         [SIOCGIWPRIV    - SIOCIWFIRST] = { /* (handled directly by us) */
  81                 .header_type    = IW_HEADER_TYPE_POINT,
  82                 .token_size     = sizeof(struct iw_priv_args),
  83                 .max_tokens     = 16,
  84                 .flags          = IW_DESCR_FLAG_NOMAX,
  85         },
  86         [SIOCSIWSTATS   - SIOCIWFIRST] = {
  87                 .header_type    = IW_HEADER_TYPE_NULL,
  88         },
  89         [SIOCGIWSTATS   - SIOCIWFIRST] = { /* (handled directly by us) */
  90                 .header_type    = IW_HEADER_TYPE_POINT,
  91                 .token_size     = 1,
  92                 .max_tokens     = sizeof(struct iw_statistics),
  93                 .flags          = IW_DESCR_FLAG_DUMP,
  94         },
  95         [SIOCSIWSPY     - SIOCIWFIRST] = {
  96                 .header_type    = IW_HEADER_TYPE_POINT,
  97                 .token_size     = sizeof(struct sockaddr),
  98                 .max_tokens     = IW_MAX_SPY,
  99         },
 100         [SIOCGIWSPY     - SIOCIWFIRST] = {
 101                 .header_type    = IW_HEADER_TYPE_POINT,
 102                 .token_size     = sizeof(struct sockaddr) +
 103                                   sizeof(struct iw_quality),
 104                 .max_tokens     = IW_MAX_SPY,
 105         },
 106         [SIOCSIWTHRSPY  - SIOCIWFIRST] = {
 107                 .header_type    = IW_HEADER_TYPE_POINT,
 108                 .token_size     = sizeof(struct iw_thrspy),
 109                 .min_tokens     = 1,
 110                 .max_tokens     = 1,
 111         },
 112         [SIOCGIWTHRSPY  - SIOCIWFIRST] = {
 113                 .header_type    = IW_HEADER_TYPE_POINT,
 114                 .token_size     = sizeof(struct iw_thrspy),
 115                 .min_tokens     = 1,
 116                 .max_tokens     = 1,
 117         },
 118         [SIOCSIWAP      - SIOCIWFIRST] = {
 119                 .header_type    = IW_HEADER_TYPE_ADDR,
 120         },
 121         [SIOCGIWAP      - SIOCIWFIRST] = {
 122                 .header_type    = IW_HEADER_TYPE_ADDR,
 123                 .flags          = IW_DESCR_FLAG_DUMP,
 124         },
 125         [SIOCSIWMLME    - SIOCIWFIRST] = {
 126                 .header_type    = IW_HEADER_TYPE_POINT,
 127                 .token_size     = 1,
 128                 .min_tokens     = sizeof(struct iw_mlme),
 129                 .max_tokens     = sizeof(struct iw_mlme),
 130         },
 131         [SIOCGIWAPLIST  - SIOCIWFIRST] = {
 132                 .header_type    = IW_HEADER_TYPE_POINT,
 133                 .token_size     = sizeof(struct sockaddr) +
 134                                   sizeof(struct iw_quality),
 135                 .max_tokens     = IW_MAX_AP,
 136                 .flags          = IW_DESCR_FLAG_NOMAX,
 137         },
 138         [SIOCSIWSCAN    - SIOCIWFIRST] = {
 139                 .header_type    = IW_HEADER_TYPE_POINT,
 140                 .token_size     = 1,
 141                 .min_tokens     = 0,
 142                 .max_tokens     = sizeof(struct iw_scan_req),
 143         },
 144         [SIOCGIWSCAN    - SIOCIWFIRST] = {
 145                 .header_type    = IW_HEADER_TYPE_POINT,
 146                 .token_size     = 1,
 147                 .max_tokens     = IW_SCAN_MAX_DATA,
 148                 .flags          = IW_DESCR_FLAG_NOMAX,
 149         },
 150         [SIOCSIWESSID   - SIOCIWFIRST] = {
 151                 .header_type    = IW_HEADER_TYPE_POINT,
 152                 .token_size     = 1,
 153                 .max_tokens     = IW_ESSID_MAX_SIZE,
 154                 .flags          = IW_DESCR_FLAG_EVENT,
 155         },
 156         [SIOCGIWESSID   - SIOCIWFIRST] = {
 157                 .header_type    = IW_HEADER_TYPE_POINT,
 158                 .token_size     = 1,
 159                 .max_tokens     = IW_ESSID_MAX_SIZE,
 160                 .flags          = IW_DESCR_FLAG_DUMP,
 161         },
 162         [SIOCSIWNICKN   - SIOCIWFIRST] = {
 163                 .header_type    = IW_HEADER_TYPE_POINT,
 164                 .token_size     = 1,
 165                 .max_tokens     = IW_ESSID_MAX_SIZE,
 166         },
 167         [SIOCGIWNICKN   - SIOCIWFIRST] = {
 168                 .header_type    = IW_HEADER_TYPE_POINT,
 169                 .token_size     = 1,
 170                 .max_tokens     = IW_ESSID_MAX_SIZE,
 171         },
 172         [SIOCSIWRATE    - SIOCIWFIRST] = {
 173                 .header_type    = IW_HEADER_TYPE_PARAM,
 174         },
 175         [SIOCGIWRATE    - SIOCIWFIRST] = {
 176                 .header_type    = IW_HEADER_TYPE_PARAM,
 177         },
 178         [SIOCSIWRTS     - SIOCIWFIRST] = {
 179                 .header_type    = IW_HEADER_TYPE_PARAM,
 180         },
 181         [SIOCGIWRTS     - SIOCIWFIRST] = {
 182                 .header_type    = IW_HEADER_TYPE_PARAM,
 183         },
 184         [SIOCSIWFRAG    - SIOCIWFIRST] = {
 185                 .header_type    = IW_HEADER_TYPE_PARAM,
 186         },
 187         [SIOCGIWFRAG    - SIOCIWFIRST] = {
 188                 .header_type    = IW_HEADER_TYPE_PARAM,
 189         },
 190         [SIOCSIWTXPOW   - SIOCIWFIRST] = {
 191                 .header_type    = IW_HEADER_TYPE_PARAM,
 192         },
 193         [SIOCGIWTXPOW   - SIOCIWFIRST] = {
 194                 .header_type    = IW_HEADER_TYPE_PARAM,
 195         },
 196         [SIOCSIWRETRY   - SIOCIWFIRST] = {
 197                 .header_type    = IW_HEADER_TYPE_PARAM,
 198         },
 199         [SIOCGIWRETRY   - SIOCIWFIRST] = {
 200                 .header_type    = IW_HEADER_TYPE_PARAM,
 201         },
 202         [SIOCSIWENCODE  - SIOCIWFIRST] = {
 203                 .header_type    = IW_HEADER_TYPE_POINT,
 204                 .token_size     = 1,
 205                 .max_tokens     = IW_ENCODING_TOKEN_MAX,
 206                 .flags          = IW_DESCR_FLAG_EVENT | IW_DESCR_FLAG_RESTRICT,
 207         },
 208         [SIOCGIWENCODE  - SIOCIWFIRST] = {
 209                 .header_type    = IW_HEADER_TYPE_POINT,
 210                 .token_size     = 1,
 211                 .max_tokens     = IW_ENCODING_TOKEN_MAX,
 212                 .flags          = IW_DESCR_FLAG_DUMP | IW_DESCR_FLAG_RESTRICT,
 213         },
 214         [SIOCSIWPOWER   - SIOCIWFIRST] = {
 215                 .header_type    = IW_HEADER_TYPE_PARAM,
 216         },
 217         [SIOCGIWPOWER   - SIOCIWFIRST] = {
 218                 .header_type    = IW_HEADER_TYPE_PARAM,
 219         },
 220         [SIOCSIWGENIE   - SIOCIWFIRST] = {
 221                 .header_type    = IW_HEADER_TYPE_POINT,
 222                 .token_size     = 1,
 223                 .max_tokens     = IW_GENERIC_IE_MAX,
 224         },
 225         [SIOCGIWGENIE   - SIOCIWFIRST] = {
 226                 .header_type    = IW_HEADER_TYPE_POINT,
 227                 .token_size     = 1,
 228                 .max_tokens     = IW_GENERIC_IE_MAX,
 229         },
 230         [SIOCSIWAUTH    - SIOCIWFIRST] = {
 231                 .header_type    = IW_HEADER_TYPE_PARAM,
 232         },
 233         [SIOCGIWAUTH    - SIOCIWFIRST] = {
 234                 .header_type    = IW_HEADER_TYPE_PARAM,
 235         },
 236         [SIOCSIWENCODEEXT - SIOCIWFIRST] = {
 237                 .header_type    = IW_HEADER_TYPE_POINT,
 238                 .token_size     = 1,
 239                 .min_tokens     = sizeof(struct iw_encode_ext),
 240                 .max_tokens     = sizeof(struct iw_encode_ext) +
 241                                   IW_ENCODING_TOKEN_MAX,
 242         },
 243         [SIOCGIWENCODEEXT - SIOCIWFIRST] = {
 244                 .header_type    = IW_HEADER_TYPE_POINT,
 245                 .token_size     = 1,
 246                 .min_tokens     = sizeof(struct iw_encode_ext),
 247                 .max_tokens     = sizeof(struct iw_encode_ext) +
 248                                   IW_ENCODING_TOKEN_MAX,
 249         },
 250         [SIOCSIWPMKSA - SIOCIWFIRST] = {
 251                 .header_type    = IW_HEADER_TYPE_POINT,
 252                 .token_size     = 1,
 253                 .min_tokens     = sizeof(struct iw_pmksa),
 254                 .max_tokens     = sizeof(struct iw_pmksa),
 255         },
 256 };
 257 static const unsigned standard_ioctl_num = ARRAY_SIZE(standard_ioctl);
 258
 259 /*
 260  * Meta-data about all the additional standard Wireless Extension events
 261  * we know about.
 262  */
 263 static const struct iw_ioctl_description standard_event[] = {
 264         [IWEVTXDROP     - IWEVFIRST] = {
 265                 .header_type    = IW_HEADER_TYPE_ADDR,
 266         },
 267         [IWEVQUAL       - IWEVFIRST] = {
 268                 .header_type    = IW_HEADER_TYPE_QUAL,
 269         },
 270         [IWEVCUSTOM     - IWEVFIRST] = {
 271                 .header_type    = IW_HEADER_TYPE_POINT,
 272                 .token_size     = 1,
 273                 .max_tokens     = IW_CUSTOM_MAX,
 274         },
 275         [IWEVREGISTERED - IWEVFIRST] = {
 276                 .header_type    = IW_HEADER_TYPE_ADDR,
 277         },
 278         [IWEVEXPIRED    - IWEVFIRST] = {
 279                 .header_type    = IW_HEADER_TYPE_ADDR,
 280         },
 281         [IWEVGENIE      - IWEVFIRST] = {
 282                 .header_type    = IW_HEADER_TYPE_POINT,
 283                 .token_size     = 1,
 284                 .max_tokens     = IW_GENERIC_IE_MAX,
 285         },
 286         [IWEVMICHAELMICFAILURE  - IWEVFIRST] = {
 287                 .header_type    = IW_HEADER_TYPE_POINT,
 288                 .token_size     = 1,
 289                 .max_tokens     = sizeof(struct iw_michaelmicfailure),
 290         },
 291         [IWEVASSOCREQIE - IWEVFIRST] = {
 292                 .header_type    = IW_HEADER_TYPE_POINT,
 293                 .token_size     = 1,
 294                 .max_tokens     = IW_GENERIC_IE_MAX,
 295         },
 296         [IWEVASSOCRESPIE        - IWEVFIRST] = {
 297                 .header_type    = IW_HEADER_TYPE_POINT,
 298                 .token_size     = 1,
 299                 .max_tokens     = IW_GENERIC_IE_MAX,
 300         },
 301         [IWEVPMKIDCAND  - IWEVFIRST] = {
 302                 .header_type    = IW_HEADER_TYPE_POINT,
 303                 .token_size     = 1,
 304                 .max_tokens     = sizeof(struct iw_pmkid_cand),
 305         },
 306 };
 307 static const unsigned standard_event_num = ARRAY_SIZE(standard_event);
 308
 309 /* Size (in bytes) of various events */
 310 static const int event_type_size[] = {
 311         IW_EV_LCP_LEN,                  /* IW_HEADER_TYPE_NULL */
 312         0,
 313         IW_EV_CHAR_LEN,                 /* IW_HEADER_TYPE_CHAR */
 314         0,
 315         IW_EV_UINT_LEN,                 /* IW_HEADER_TYPE_UINT */
 316         IW_EV_FREQ_LEN,                 /* IW_HEADER_TYPE_FREQ */
 317         IW_EV_ADDR_LEN,                 /* IW_HEADER_TYPE_ADDR */
 318         0,
 319         IW_EV_POINT_LEN,                /* Without variable payload */
 320         IW_EV_PARAM_LEN,                /* IW_HEADER_TYPE_PARAM */
 321         IW_EV_QUAL_LEN,                 /* IW_HEADER_TYPE_QUAL */
 322 };
 323
 324 #ifdef CONFIG_COMPAT
 325 static const int compat_event_type_size[] = {
 326         IW_EV_COMPAT_LCP_LEN,           /* IW_HEADER_TYPE_NULL */
 327         0,
 328         IW_EV_COMPAT_CHAR_LEN,          /* IW_HEADER_TYPE_CHAR */
 329         0,
 330         IW_EV_COMPAT_UINT_LEN,          /* IW_HEADER_TYPE_UINT */
 331         IW_EV_COMPAT_FREQ_LEN,          /* IW_HEADER_TYPE_FREQ */
 332         IW_EV_COMPAT_ADDR_LEN,          /* IW_HEADER_TYPE_ADDR */
 333         0,
 334         IW_EV_COMPAT_POINT_LEN,         /* Without variable payload */
 335         IW_EV_COMPAT_PARAM_LEN,         /* IW_HEADER_TYPE_PARAM */
 336         IW_EV_COMPAT_QUAL_LEN,          /* IW_HEADER_TYPE_QUAL */
 337 };
 338 #endif
 339
 340
 341 /* IW event code */
 342
 343 static int __net_init wext_pernet_init(struct net *net)
 344 {
 345         skb_queue_head_init(&net->wext_nlevents);
 346         return 0;
 347 }
 348
 349 static void __net_exit wext_pernet_exit(struct net *net)
 350 {
 351         skb_queue_purge(&net->wext_nlevents);
 352 }
 353
 354 static struct pernet_operations wext_pernet_ops = {
 355         .init = wext_pernet_init,
 356         .exit = wext_pernet_exit,
 357 };
 358
 359 static int __init wireless_nlevent_init(void)
 360 {
 361         return register_pernet_subsys(&wext_pernet_ops);
 362 }
 363
 364 subsys_initcall(wireless_nlevent_init);
 365
 366 /* Process events generated by the wireless layer or the driver. */
 367 static void wireless_nlevent_process(struct work_struct *work)
 368 {
 369         struct sk_buff *skb;
 370         struct net *net;
 371
 372         rtnl_lock();
 373
 374         for_each_net(net) {
 375                 while ((skb = skb_dequeue(&net->wext_nlevents)))
 376                         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL,
 377                                     GFP_KERNEL);
 378         }
 379
 380         rtnl_unlock();
 381 }
 382
 383 static DECLARE_WORK(wireless_nlevent_work, wireless_nlevent_process);
 384
 385 static struct nlmsghdr *rtnetlink_ifinfo_prep(struct net_device *dev,
 386                                               struct sk_buff *skb)
 387 {
 388         struct ifinfomsg *r;
 389         struct nlmsghdr  *nlh;
 390
 391         nlh = nlmsg_put(skb, 0, 0, RTM_NEWLINK, sizeof(*r), 0);
 392         if (!nlh)
 393                 return NULL;
 394
 395         r = nlmsg_data(nlh);
 396         r->ifi_family = AF_UNSPEC;
 397         r->__ifi_pad = 0;
 398         r->ifi_type = dev->type;
 399         r->ifi_index = dev->ifindex;
 400         r->ifi_flags = dev_get_flags(dev);
 401         r->ifi_change = 0;      /* Wireless changes don't affect those flags */
 402
 403         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
 404
 405         return nlh;
 406  nla_put_failure:
 407         nlmsg_cancel(skb, nlh);
 408         return NULL;
 409 }
 410
 411
 412 /*
 413  * Main event dispatcher. Called from other parts and drivers.
 414  * Send the event on the appropriate channels.
 415  * May be called from interrupt context.
 416  */
 417 void wireless_send_event(struct net_device *    dev,
 418                          unsigned int           cmd,
 419                          union iwreq_data *     wrqu,
 420                          const char *           extra)
 421 {
 422         const struct iw_ioctl_description *     descr = NULL;
 423         int extra_len = 0;
 424         struct iw_event  *event;                /* Mallocated whole event */
 425         int event_len;                          /* Its size */
 426         int hdr_len;                            /* Size of the event header */
 427         int wrqu_off = 0;                       /* Offset in wrqu */
 428         /* Don't "optimise" the following variable, it will crash */
 429         unsigned        cmd_index;              /* *MUST* be unsigned */
 430         struct sk_buff *skb;
 431         struct nlmsghdr *nlh;
 432         struct nlattr *nla;
 433 #ifdef CONFIG_COMPAT
 434         struct __compat_iw_event *compat_event;
 435         struct compat_iw_point compat_wrqu;
 436         struct sk_buff *compskb;
 437 #endif
 438
 439         /*
 440          * Nothing in the kernel sends scan events with data, be safe.
 441          * This is necessary because we cannot fix up scan event data
 442          * for compat, due to being contained in 'extra', but normally
 443          * applications are required to retrieve the scan data anyway
 444          * and no data is included in the event, this codifies that
 445          * practice.
 446          */
 447         if (WARN_ON(cmd == SIOCGIWSCAN && extra))
 448                 extra = NULL;
 449
 450         /* Get the description of the Event */
 451         if (cmd <= SIOCIWLAST) {
 452                 cmd_index = cmd - SIOCIWFIRST;
 453                 if (cmd_index < standard_ioctl_num)
 454                         descr = &(standard_ioctl[cmd_index]);
 455         } else {
 456                 cmd_index = cmd - IWEVFIRST;
 457                 if (cmd_index < standard_event_num)
 458                         descr = &(standard_event[cmd_index]);
 459         }
 460         /* Don't accept unknown events */
 461         if (descr == NULL) {
 462                 /* Note : we don't return an error to the driver, because
 463                  * the driver would not know what to do about it. It can't
 464                  * return an error to the user, because the event is not
 465                  * initiated by a user request.
 466                  * The best the driver could do is to log an error message.
 467                  * We will do it ourselves instead...
 468                  */
 469                 printk(KERN_ERR "%s (WE) : Invalid/Unknown Wireless Event (0x%04X)\n",
 470                        dev->name, cmd);
 471                 return;
 472         }
 473
 474         /* Check extra parameters and set extra_len */
 475         if (descr->header_type == IW_HEADER_TYPE_POINT) {
 476                 /* Check if number of token fits within bounds */
 477                 if (wrqu->data.length > descr->max_tokens) {
 478                         printk(KERN_ERR "%s (WE) : Wireless Event too big (%d)\n", dev->name, wrqu->data.length);
 479                         return;
 480                 }
 481                 if (wrqu->data.length < descr->min_tokens) {
 482                         printk(KERN_ERR "%s (WE) : Wireless Event too small (%d)\n", dev->name, wrqu->data.length);
 483                         return;
 484                 }
 485                 /* Calculate extra_len - extra is NULL for restricted events */
 486                 if (extra != NULL)
 487                         extra_len = wrqu->data.length * descr->token_size;
 488                 /* Always at an offset in wrqu */
 489                 wrqu_off = IW_EV_POINT_OFF;
 490         }
 491
 492         /* Total length of the event */
 493         hdr_len = event_type_size[descr->header_type];
 494         event_len = hdr_len + extra_len;
 495
 496         /*
 497          * The problem for 64/32 bit.
 498          *
 499          * On 64-bit, a regular event is laid out as follows:
 500          *      |  0  |  1  |  2  |  3  |  4  |  5  |  6  |  7  |
 501          *      | event.len | event.cmd |     p a d d i n g     |
 502          *      | wrqu data ... (with the correct size)         |
 503          *
 504          * This padding exists because we manipulate event->u,
 505          * and 'event' is not packed.
 506          *
 507          * An iw_point event is laid out like this instead:
 508          *      |  0  |  1  |  2  |  3  |  4  |  5  |  6  |  7  |
 509          *      | event.len | event.cmd |     p a d d i n g     |
 510          *      | iwpnt.len | iwpnt.flg |     p a d d i n g     |
 511          *      | extra data  ...
 512          *
 513          * The second padding exists because struct iw_point is extended,
 514          * but this depends on the platform...
 515          *
 516          * On 32-bit, all the padding shouldn't be there.
 517          */
 518
 519         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
 520         if (!skb)
 521                 return;
 522
 523         /* Send via the RtNetlink event channel */
 524         nlh = rtnetlink_ifinfo_prep(dev, skb);
 525         if (WARN_ON(!nlh)) {
 526                 kfree_skb(skb);
 527                 return;
 528         }
 529
 530         /* Add the wireless events in the netlink packet */
 531         nla = nla_reserve(skb, IFLA_WIRELESS, event_len);
 532         if (!nla) {
 533                 kfree_skb(skb);
 534                 return;
 535         }
 536         event = nla_data(nla);
 537
 538         /* Fill event - first clear to avoid data leaking */
 539         memset(event, 0, hdr_len);
 540         event->len = event_len;
 541         event->cmd = cmd;
 542         memcpy(&event->u, ((char *) wrqu) + wrqu_off, hdr_len - IW_EV_LCP_LEN);
 543         if (extra_len)
 544                 memcpy(((char *) event) + hdr_len, extra, extra_len);
 545
 546         nlmsg_end(skb, nlh);
 547 #ifdef CONFIG_COMPAT
 548         hdr_len = compat_event_type_size[descr->header_type];
 549         event_len = hdr_len + extra_len;
 550
 551         compskb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
 552         if (!compskb) {
 553                 kfree_skb(skb);
 554                 return;
 555         }
 556
 557         /* Send via the RtNetlink event channel */
 558         nlh = rtnetlink_ifinfo_prep(dev, compskb);
 559         if (WARN_ON(!nlh)) {
 560                 kfree_skb(skb);
 561                 kfree_skb(compskb);
 562                 return;
 563         }
 564
 565         /* Add the wireless events in the netlink packet */
 566         nla = nla_reserve(compskb, IFLA_WIRELESS, event_len);
 567         if (!nla) {
 568                 kfree_skb(skb);
 569                 kfree_skb(compskb);
 570                 return;
 571         }
 572         compat_event = nla_data(nla);
 573
 574         compat_event->len = event_len;
 575         compat_event->cmd = cmd;
 576         if (descr->header_type == IW_HEADER_TYPE_POINT) {
 577                 compat_wrqu.length = wrqu->data.length;
 578                 compat_wrqu.flags = wrqu->data.flags;
 579                 memcpy(&compat_event->pointer,
 580                         ((char *) &compat_wrqu) + IW_EV_COMPAT_POINT_OFF,
 581                         hdr_len - IW_EV_COMPAT_LCP_LEN);
 582                 if (extra_len)
 583                         memcpy(((char *) compat_event) + hdr_len,
 584                                 extra, extra_len);
 585         } else {
 586                 /* extra_len must be zero, so no if (extra) needed */
 587                 memcpy(&compat_event->pointer, wrqu,
 588                         hdr_len - IW_EV_COMPAT_LCP_LEN);
 589         }
 590
 591         nlmsg_end(compskb, nlh);
 592
 593         skb_shinfo(skb)->frag_list = compskb;
 594 #endif
 595         skb_queue_tail(&dev_net(dev)->wext_nlevents, skb);
 596         schedule_work(&wireless_nlevent_work);
 597 }
 598 EXPORT_SYMBOL(wireless_send_event);
 599
 600
 601
 602 /* IW handlers */
 603
 604 struct iw_statistics *get_wireless_stats(struct net_device *dev)
 605 {
 606 #ifdef CONFIG_WIRELESS_EXT
 607         if ((dev->wireless_handlers != NULL) &&
 608            (dev->wireless_handlers->get_wireless_stats != NULL))
 609                 return dev->wireless_handlers->get_wireless_stats(dev);
 610 #endif
 611
 612 #ifdef CONFIG_CFG80211_WEXT
 613         if (dev->ieee80211_ptr && dev->ieee80211_ptr &&
 614             dev->ieee80211_ptr->wiphy &&
 615             dev->ieee80211_ptr->wiphy->wext &&
 616             dev->ieee80211_ptr->wiphy->wext->get_wireless_stats)
 617                 return dev->ieee80211_ptr->wiphy->wext->get_wireless_stats(dev);
 618 #endif
 619
 620         /* not found */
 621         return NULL;
 622 }
 623
 624 static int iw_handler_get_iwstats(struct net_device *           dev,
 625                                   struct iw_request_info *      info,
 626                                   union iwreq_data *            wrqu,
 627                                   char *                        extra)
 628 {
 629         /* Get stats from the driver */
 630         struct iw_statistics *stats;
 631
 632         stats = get_wireless_stats(dev);
 633         if (stats) {
 634                 /* Copy statistics to extra */
 635                 memcpy(extra, stats, sizeof(struct iw_statistics));
 636                 wrqu->data.length = sizeof(struct iw_statistics);
 637
 638                 /* Check if we need to clear the updated flag */
 639                 if (wrqu->data.flags != 0)
 640                         stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
 641                 return 0;
 642         } else
 643                 return -EOPNOTSUPP;
 644 }
 645
 646 static iw_handler get_handler(struct net_device *dev, unsigned int cmd)
 647 {
 648         /* Don't "optimise" the following variable, it will crash */
 649         unsigned int    index;          /* *MUST* be unsigned */
 650         const struct iw_handler_def *handlers = NULL;
 651
 652 #ifdef CONFIG_CFG80211_WEXT
 653         if (dev->ieee80211_ptr && dev->ieee80211_ptr->wiphy)
 654                 handlers = dev->ieee80211_ptr->wiphy->wext;
 655 #endif
 656 #ifdef CONFIG_WIRELESS_EXT
 657         if (dev->wireless_handlers)
 658                 handlers = dev->wireless_handlers;
 659 #endif
 660
 661         if (!handlers)
 662                 return NULL;
 663
 664         /* Try as a standard command */
 665         index = cmd - SIOCIWFIRST;
 666         if (index < handlers->num_standard)
 667                 return handlers->standard[index];
 668
 669 #ifdef CONFIG_WEXT_PRIV
 670         /* Try as a private command */
 671         index = cmd - SIOCIWFIRSTPRIV;
 672         if (index < handlers->num_private)
 673                 return handlers->private[index];
 674 #endif
 675
 676         /* Not found */
 677         return NULL;
 678 }
 679
 680 static int ioctl_standard_iw_point(struct iw_point *iwp, unsigned int cmd,
 681                                    const struct iw_ioctl_description *descr,
 682                                    iw_handler handler, struct net_device *dev,
 683                                    struct iw_request_info *info)
 684 {
 685         int err, extra_size, user_length = 0, essid_compat = 0;
 686         char *extra;
 687
 688         /* Calculate space needed by arguments. Always allocate
 689          * for max space.
 690          */
 691         extra_size = descr->max_tokens * descr->token_size;
 692
 693         /* Check need for ESSID compatibility for WE < 21 */
 694         switch (cmd) {
 695         case SIOCSIWESSID:
 696         case SIOCGIWESSID:
 697         case SIOCSIWNICKN:
 698         case SIOCGIWNICKN:
 699                 if (iwp->length == descr->max_tokens + 1)
 700                         essid_compat = 1;
 701                 else if (IW_IS_SET(cmd) && (iwp->length != 0)) {
 702                         char essid[IW_ESSID_MAX_SIZE + 1];
 703                         unsigned int len;
 704                         len = iwp->length * descr->token_size;
 705
 706                         if (len > IW_ESSID_MAX_SIZE)
 707                                 return -EFAULT;
 708
 709                         err = copy_from_user(essid, iwp->pointer, len);
 710                         if (err)
 711                                 return -EFAULT;
 712
 713                         if (essid[iwp->length - 1] == '\0')
 714                                 essid_compat = 1;
 715                 }
 716                 break;
 717         default:
 718                 break;
 719         }
 720
 721         iwp->length -= essid_compat;
 722
 723         /* Check what user space is giving us */
 724         if (IW_IS_SET(cmd)) {
 725                 /* Check NULL pointer */
 726                 if (!iwp->pointer && iwp->length != 0)
 727                         return -EFAULT;
 728                 /* Check if number of token fits within bounds */
 729                 if (iwp->length > descr->max_tokens)
 730                         return -E2BIG;
 731                 if (iwp->length < descr->min_tokens)
 732                         return -EINVAL;
 733         } else {
 734                 /* Check NULL pointer */
 735                 if (!iwp->pointer)
 736                         return -EFAULT;
 737                 /* Save user space buffer size for checking */
 738                 user_length = iwp->length;
 739
 740                 /* Don't check if user_length > max to allow forward
 741                  * compatibility. The test user_length < min is
 742                  * implied by the test at the end.
 743                  */
 744
 745                 /* Support for very large requests */
 746                 if ((descr->flags & IW_DESCR_FLAG_NOMAX) &&
 747                     (user_length > descr->max_tokens)) {
 748                         /* Allow userspace to GET more than max so
 749                          * we can support any size GET requests.
 750                          * There is still a limit : -ENOMEM.
 751                          */
 752                         extra_size = user_length * descr->token_size;
 753
 754                         /* Note : user_length is originally a __u16,
 755                          * and token_size is controlled by us,
 756                          * so extra_size won't get negative and
 757                          * won't overflow...
 758                          */
 759                 }
 760         }
 761
 762         /* kzalloc() ensures NULL-termination for essid_compat. */
 763         extra = kzalloc(extra_size, GFP_KERNEL);
 764         if (!extra)
 765                 return -ENOMEM;
 766
 767         /* If it is a SET, get all the extra data in here */
 768         if (IW_IS_SET(cmd) && (iwp->length != 0)) {
 769                 if (copy_from_user(extra, iwp->pointer,
 770                                    iwp->length *
 771                                    descr->token_size)) {
 772                         err = -EFAULT;
 773                         goto out;
 774                 }
 775
 776                 if (cmd == SIOCSIWENCODEEXT) {
 777                         struct iw_encode_ext *ee = (void *) extra;
 778
 779                         if (iwp->length < sizeof(*ee) + ee->key_len)
 780                                 return -EFAULT;
 781                 }
 782         }
 783
 784         err = handler(dev, info, (union iwreq_data *) iwp, extra);
 785
 786         iwp->length += essid_compat;
 787
 788         /* If we have something to return to the user */
 789         if (!err && IW_IS_GET(cmd)) {
 790                 /* Check if there is enough buffer up there */
 791                 if (user_length < iwp->length) {
 792                         err = -E2BIG;
 793                         goto out;
 794                 }
 795
 796                 if (copy_to_user(iwp->pointer, extra,
 797                                  iwp->length *
 798                                  descr->token_size)) {
 799                         err = -EFAULT;
 800                         goto out;
 801                 }
 802         }
 803
 804         /* Generate an event to notify listeners of the change */
 805         if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
 806             ((err == 0) || (err == -EIWCOMMIT))) {
 807                 union iwreq_data *data = (union iwreq_data *) iwp;
 808
 809                 if (descr->flags & IW_DESCR_FLAG_RESTRICT)
 810                         /* If the event is restricted, don't
 811                          * export the payload.
 812                          */
 813                         wireless_send_event(dev, cmd, data, NULL);
 814                 else
 815                         wireless_send_event(dev, cmd, data, extra);
 816         }
 817
 818 out:
 819         kfree(extra);
 820         return err;
 821 }
 822
 823 /*
 824  * Call the commit handler in the driver
 825  * (if exist and if conditions are right)
 826  *
 827  * Note : our current commit strategy is currently pretty dumb,
 828  * but we will be able to improve on that...
 829  * The goal is to try to agreagate as many changes as possible
 830  * before doing the commit. Drivers that will define a commit handler
 831  * are usually those that need a reset after changing parameters, so
 832  * we want to minimise the number of reset.
 833  * A cool idea is to use a timer : at each "set" command, we re-set the
 834  * timer, when the timer eventually fires, we call the driver.
 835  * Hopefully, more on that later.
 836  *
 837  * Also, I'm waiting to see how many people will complain about the
 838  * netif_running(dev) test. I'm open on that one...
 839  * Hopefully, the driver will remember to do a commit in "open()" ;-)
 840  */
 841 int call_commit_handler(struct net_device *dev)
 842 {
 843 #ifdef CONFIG_WIRELESS_EXT
 844         if ((netif_running(dev)) &&
 845            (dev->wireless_handlers->standard[0] != NULL))
 846                 /* Call the commit handler on the driver */
 847                 return dev->wireless_handlers->standard[0](dev, NULL,
 848                                                            NULL, NULL);
 849         else
 850                 return 0;               /* Command completed successfully */
 851 #else
 852         /* cfg80211 has no commit */
 853         return 0;
 854 #endif
 855 }
 856
 857 /*
 858  * Main IOCTl dispatcher.
 859  * Check the type of IOCTL and call the appropriate wrapper...
 860  */
 861 static int wireless_process_ioctl(struct net *net, struct ifreq *ifr,
 862                                   unsigned int cmd,
 863                                   struct iw_request_info *info,
 864                                   wext_ioctl_func standard,
 865                                   wext_ioctl_func private)
 866 {
 867         struct iwreq *iwr = (struct iwreq *) ifr;
 868         struct net_device *dev;
 869         iw_handler      handler;
 870
 871         /* Permissions are already checked in dev_ioctl() before calling us.
 872          * The copy_to/from_user() of ifr is also dealt with in there */
 873
 874         /* Make sure the device exist */
 875         if ((dev = __dev_get_by_name(net, ifr->ifr_name)) == NULL)
 876                 return -ENODEV;
 877
 878         /* A bunch of special cases, then the generic case...
 879          * Note that 'cmd' is already filtered in dev_ioctl() with
 880          * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */
 881         if (cmd == SIOCGIWSTATS)
 882                 return standard(dev, iwr, cmd, info,
 883                                 &iw_handler_get_iwstats);
 884
 885 #ifdef CONFIG_WEXT_PRIV
 886         if (cmd == SIOCGIWPRIV && dev->wireless_handlers)
 887                 return standard(dev, iwr, cmd, info,
 888                                 iw_handler_get_private);
 889 #endif
 890
 891         /* Basic check */
 892         if (!netif_device_present(dev))
 893                 return -ENODEV;
 894
 895         /* New driver API : try to find the handler */
 896         handler = get_handler(dev, cmd);
 897         if (handler) {
 898                 /* Standard and private are not the same */
 899                 if (cmd < SIOCIWFIRSTPRIV)
 900                         return standard(dev, iwr, cmd, info, handler);
 901                 else if (private)
 902                         return private(dev, iwr, cmd, info, handler);
 903         }
 904         /* Old driver API : call driver ioctl handler */
 905         if (dev->netdev_ops->ndo_do_ioctl)
 906                 return dev->netdev_ops->ndo_do_ioctl(dev, ifr, cmd);
 907         return -EOPNOTSUPP;
 908 }
 909
 910 /* If command is `set a parameter', or `get the encoding parameters',
 911  * check if the user has the right to do it.
 912  */
 913 static int wext_permission_check(unsigned int cmd)
 914 {
 915         if ((IW_IS_SET(cmd) || cmd == SIOCGIWENCODE ||
 916              cmd == SIOCGIWENCODEEXT) &&
 917             !capable(CAP_NET_ADMIN))
 918                 return -EPERM;
 919
 920         return 0;
 921 }
 922
 923 /* entry point from dev ioctl */
 924 static int wext_ioctl_dispatch(struct net *net, struct ifreq *ifr,
 925                                unsigned int cmd, struct iw_request_info *info,
 926                                wext_ioctl_func standard,
 927                                wext_ioctl_func private)
 928 {
 929         int ret = wext_permission_check(cmd);
 930
 931         if (ret)
 932                 return ret;
 933
 934         dev_load(net, ifr->ifr_name);
 935         rtnl_lock();
 936         ret = wireless_process_ioctl(net, ifr, cmd, info, standard, private);
 937         rtnl_unlock();
 938
 939         return ret;
 940 }
 941
 942 /*
 943  * Wrapper to call a standard Wireless Extension handler.
 944  * We do various checks and also take care of moving data between
 945  * user space and kernel space.
 946  */
 947 static int ioctl_standard_call(struct net_device *      dev,
 948                                struct iwreq             *iwr,
 949                                unsigned int             cmd,
 950                                struct iw_request_info   *info,
 951                                iw_handler               handler)
 952 {
 953         const struct iw_ioctl_description *     descr;
 954         int                                     ret = -EINVAL;
 955
 956         /* Get the description of the IOCTL */
 957         if ((cmd - SIOCIWFIRST) >= standard_ioctl_num)
 958                 return -EOPNOTSUPP;
 959         descr = &(standard_ioctl[cmd - SIOCIWFIRST]);
 960
 961         /* Check if we have a pointer to user space data or not */
 962         if (descr->header_type != IW_HEADER_TYPE_POINT) {
 963
 964                 /* No extra arguments. Trivial to handle */
 965                 ret = handler(dev, info, &(iwr->u), NULL);
 966
 967                 /* Generate an event to notify listeners of the change */
 968                 if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
 969                    ((ret == 0) || (ret == -EIWCOMMIT)))
 970                         wireless_send_event(dev, cmd, &(iwr->u), NULL);
 971         } else {
 972                 ret = ioctl_standard_iw_point(&iwr->u.data, cmd, descr,
 973                                               handler, dev, info);
 974         }
 975
 976         /* Call commit handler if needed and defined */
 977         if (ret == -EIWCOMMIT)
 978                 ret = call_commit_handler(dev);
 979
 980         /* Here, we will generate the appropriate event if needed */
 981
 982         return ret;
 983 }
 984
 985
 986 int wext_handle_ioctl(struct net *net, struct ifreq *ifr, unsigned int cmd,
 987                       void __user *arg)
 988 {
 989         struct iw_request_info info = { .cmd = cmd, .flags = 0 };
 990         int ret;
 991
 992         ret = wext_ioctl_dispatch(net, ifr, cmd, &info,
 993                                   ioctl_standard_call,
 994                                   ioctl_private_call);
 995         if (ret >= 0 &&
 996             IW_IS_GET(cmd) &&
 997             copy_to_user(arg, ifr, sizeof(struct iwreq)))
 998                 return -EFAULT;
 999
1000         return ret;
1001 }
1002
1003 #ifdef CONFIG_COMPAT
1004 static int compat_standard_call(struct net_device       *dev,
1005                                 struct iwreq            *iwr,
1006                                 unsigned int            cmd,
1007                                 struct iw_request_info  *info,
1008                                 iw_handler              handler)
1009 {
1010         const struct iw_ioctl_description *descr;
1011         struct compat_iw_point *iwp_compat;
1012         struct iw_point iwp;
1013         int err;
1014
1015         descr = standard_ioctl + (cmd - SIOCIWFIRST);
1016
1017         if (descr->header_type != IW_HEADER_TYPE_POINT)
1018                 return ioctl_standard_call(dev, iwr, cmd, info, handler);
1019
1020         iwp_compat = (struct compat_iw_point *) &iwr->u.data;
1021         iwp.pointer = compat_ptr(iwp_compat->pointer);
1022         iwp.length = iwp_compat->length;
1023         iwp.flags = iwp_compat->flags;
1024
1025         err = ioctl_standard_iw_point(&iwp, cmd, descr, handler, dev, info);
1026
1027         iwp_compat->pointer = ptr_to_compat(iwp.pointer);
1028         iwp_compat->length = iwp.length;
1029         iwp_compat->flags = iwp.flags;
1030
1031         return err;
1032 }
1033
1034 int compat_wext_handle_ioctl(struct net *net, unsigned int cmd,
1035                              unsigned long arg)
1036 {
1037         void __user *argp = (void __user *)arg;
1038         struct iw_request_info info;
1039         struct iwreq iwr;
1040         char *colon;
1041         int ret;
1042
1043         if (copy_from_user(&iwr, argp, sizeof(struct iwreq)))
1044                 return -EFAULT;
1045
1046         iwr.ifr_name[IFNAMSIZ-1] = 0;
1047         colon = strchr(iwr.ifr_name, ':');
1048         if (colon)
1049                 *colon = 0;
1050
1051         info.cmd = cmd;
1052         info.flags = IW_REQUEST_FLAG_COMPAT;
1053
1054         ret = wext_ioctl_dispatch(net, (struct ifreq *) &iwr, cmd, &info,
1055                                   compat_standard_call,
1056                                   compat_private_call);
1057
1058         if (ret >= 0 &&
1059             IW_IS_GET(cmd) &&
1060             copy_to_user(argp, &iwr, sizeof(struct iwreq)))
1061                 return -EFAULT;
1062
1063         return ret;
1064 }
1065 #endif