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 <net/cfg80211.h>
  17 #include <net/iw_handler.h>
  18 #include <net/netlink.h>
  19 #include <net/wext.h>
  20 #include <net/net_namespace.h>
  21
  22 typedef int (*wext_ioctl_func)(struct net_device *, struct iwreq *,
  23                                unsigned int, struct iw_request_info *,
  24                                iw_handler);
  25
  26
  27 /*
  28  * Meta-data about all the standard Wireless Extension request we
  29  * know about.
  30  */
  31 static const struct iw_ioctl_description standard_ioctl[] = {
  32         [IW_IOCTL_IDX(SIOCSIWCOMMIT)] = {
  33                 .header_type    = IW_HEADER_TYPE_NULL,
  34         },
  35         [IW_IOCTL_IDX(SIOCGIWNAME)] = {
  36                 .header_type    = IW_HEADER_TYPE_CHAR,
  37                 .flags          = IW_DESCR_FLAG_DUMP,
  38         },
  39         [IW_IOCTL_IDX(SIOCSIWNWID)] = {
  40                 .header_type    = IW_HEADER_TYPE_PARAM,
  41                 .flags          = IW_DESCR_FLAG_EVENT,
  42         },
  43         [IW_IOCTL_IDX(SIOCGIWNWID)] = {
  44                 .header_type    = IW_HEADER_TYPE_PARAM,
  45                 .flags          = IW_DESCR_FLAG_DUMP,
  46         },
  47         [IW_IOCTL_IDX(SIOCSIWFREQ)] = {
  48                 .header_type    = IW_HEADER_TYPE_FREQ,
  49                 .flags          = IW_DESCR_FLAG_EVENT,
  50         },
  51         [IW_IOCTL_IDX(SIOCGIWFREQ)] = {
  52                 .header_type    = IW_HEADER_TYPE_FREQ,
  53                 .flags          = IW_DESCR_FLAG_DUMP,
  54         },
  55         [IW_IOCTL_IDX(SIOCSIWMODE)] = {
  56                 .header_type    = IW_HEADER_TYPE_UINT,
  57                 .flags          = IW_DESCR_FLAG_EVENT,
  58         },
  59         [IW_IOCTL_IDX(SIOCGIWMODE)] = {
  60                 .header_type    = IW_HEADER_TYPE_UINT,
  61                 .flags          = IW_DESCR_FLAG_DUMP,
  62         },
  63         [IW_IOCTL_IDX(SIOCSIWSENS)] = {
  64                 .header_type    = IW_HEADER_TYPE_PARAM,
  65         },
  66         [IW_IOCTL_IDX(SIOCGIWSENS)] = {
  67                 .header_type    = IW_HEADER_TYPE_PARAM,
  68         },
  69         [IW_IOCTL_IDX(SIOCSIWRANGE)] = {
  70                 .header_type    = IW_HEADER_TYPE_NULL,
  71         },
  72         [IW_IOCTL_IDX(SIOCGIWRANGE)] = {
  73                 .header_type    = IW_HEADER_TYPE_POINT,
  74                 .token_size     = 1,
  75                 .max_tokens     = sizeof(struct iw_range),
  76                 .flags          = IW_DESCR_FLAG_DUMP,
  77         },
  78         [IW_IOCTL_IDX(SIOCSIWPRIV)] = {
  79                 .header_type    = IW_HEADER_TYPE_NULL,
  80         },
  81         [IW_IOCTL_IDX(SIOCGIWPRIV)] = { /* (handled directly by us) */
  82                 .header_type    = IW_HEADER_TYPE_POINT,
  83                 .token_size     = sizeof(struct iw_priv_args),
  84                 .max_tokens     = 16,
  85                 .flags          = IW_DESCR_FLAG_NOMAX,
  86         },
  87         [IW_IOCTL_IDX(SIOCSIWSTATS)] = {
  88                 .header_type    = IW_HEADER_TYPE_NULL,
  89         },
  90         [IW_IOCTL_IDX(SIOCGIWSTATS)] = { /* (handled directly by us) */
  91                 .header_type    = IW_HEADER_TYPE_POINT,
  92                 .token_size     = 1,
  93                 .max_tokens     = sizeof(struct iw_statistics),
  94                 .flags          = IW_DESCR_FLAG_DUMP,
  95         },
  96         [IW_IOCTL_IDX(SIOCSIWSPY)] = {
  97                 .header_type    = IW_HEADER_TYPE_POINT,
  98                 .token_size     = sizeof(struct sockaddr),
  99                 .max_tokens     = IW_MAX_SPY,
 100         },
 101         [IW_IOCTL_IDX(SIOCGIWSPY)] = {
 102                 .header_type    = IW_HEADER_TYPE_POINT,
 103                 .token_size     = sizeof(struct sockaddr) +
 104                                   sizeof(struct iw_quality),
 105                 .max_tokens     = IW_MAX_SPY,
 106         },
 107         [IW_IOCTL_IDX(SIOCSIWTHRSPY)] = {
 108                 .header_type    = IW_HEADER_TYPE_POINT,
 109                 .token_size     = sizeof(struct iw_thrspy),
 110                 .min_tokens     = 1,
 111                 .max_tokens     = 1,
 112         },
 113         [IW_IOCTL_IDX(SIOCGIWTHRSPY)] = {
 114                 .header_type    = IW_HEADER_TYPE_POINT,
 115                 .token_size     = sizeof(struct iw_thrspy),
 116                 .min_tokens     = 1,
 117                 .max_tokens     = 1,
 118         },
 119         [IW_IOCTL_IDX(SIOCSIWAP)] = {
 120                 .header_type    = IW_HEADER_TYPE_ADDR,
 121         },
 122         [IW_IOCTL_IDX(SIOCGIWAP)] = {
 123                 .header_type    = IW_HEADER_TYPE_ADDR,
 124                 .flags          = IW_DESCR_FLAG_DUMP,
 125         },
 126         [IW_IOCTL_IDX(SIOCSIWMLME)] = {
 127                 .header_type    = IW_HEADER_TYPE_POINT,
 128                 .token_size     = 1,
 129                 .min_tokens     = sizeof(struct iw_mlme),
 130                 .max_tokens     = sizeof(struct iw_mlme),
 131         },
 132         [IW_IOCTL_IDX(SIOCGIWAPLIST)] = {
 133                 .header_type    = IW_HEADER_TYPE_POINT,
 134                 .token_size     = sizeof(struct sockaddr) +
 135                                   sizeof(struct iw_quality),
 136                 .max_tokens     = IW_MAX_AP,
 137                 .flags          = IW_DESCR_FLAG_NOMAX,
 138         },
 139         [IW_IOCTL_IDX(SIOCSIWSCAN)] = {
 140                 .header_type    = IW_HEADER_TYPE_POINT,
 141                 .token_size     = 1,
 142                 .min_tokens     = 0,
 143                 .max_tokens     = sizeof(struct iw_scan_req),
 144         },
 145         [IW_IOCTL_IDX(SIOCGIWSCAN)] = {
 146                 .header_type    = IW_HEADER_TYPE_POINT,
 147                 .token_size     = 1,
 148                 .max_tokens     = IW_SCAN_MAX_DATA,
 149                 .flags          = IW_DESCR_FLAG_NOMAX,
 150         },
 151         [IW_IOCTL_IDX(SIOCSIWESSID)] = {
 152                 .header_type    = IW_HEADER_TYPE_POINT,
 153                 .token_size     = 1,
 154                 .max_tokens     = IW_ESSID_MAX_SIZE,
 155                 .flags          = IW_DESCR_FLAG_EVENT,
 156         },
 157         [IW_IOCTL_IDX(SIOCGIWESSID)] = {
 158                 .header_type    = IW_HEADER_TYPE_POINT,
 159                 .token_size     = 1,
 160                 .max_tokens     = IW_ESSID_MAX_SIZE,
 161                 .flags          = IW_DESCR_FLAG_DUMP,
 162         },
 163         [IW_IOCTL_IDX(SIOCSIWNICKN)] = {
 164                 .header_type    = IW_HEADER_TYPE_POINT,
 165                 .token_size     = 1,
 166                 .max_tokens     = IW_ESSID_MAX_SIZE,
 167         },
 168         [IW_IOCTL_IDX(SIOCGIWNICKN)] = {
 169                 .header_type    = IW_HEADER_TYPE_POINT,
 170                 .token_size     = 1,
 171                 .max_tokens     = IW_ESSID_MAX_SIZE,
 172         },
 173         [IW_IOCTL_IDX(SIOCSIWRATE)] = {
 174                 .header_type    = IW_HEADER_TYPE_PARAM,
 175         },
 176         [IW_IOCTL_IDX(SIOCGIWRATE)] = {
 177                 .header_type    = IW_HEADER_TYPE_PARAM,
 178         },
 179         [IW_IOCTL_IDX(SIOCSIWRTS)] = {
 180                 .header_type    = IW_HEADER_TYPE_PARAM,
 181         },
 182         [IW_IOCTL_IDX(SIOCGIWRTS)] = {
 183                 .header_type    = IW_HEADER_TYPE_PARAM,
 184         },
 185         [IW_IOCTL_IDX(SIOCSIWFRAG)] = {
 186                 .header_type    = IW_HEADER_TYPE_PARAM,
 187         },
 188         [IW_IOCTL_IDX(SIOCGIWFRAG)] = {
 189                 .header_type    = IW_HEADER_TYPE_PARAM,
 190         },
 191         [IW_IOCTL_IDX(SIOCSIWTXPOW)] = {
 192                 .header_type    = IW_HEADER_TYPE_PARAM,
 193         },
 194         [IW_IOCTL_IDX(SIOCGIWTXPOW)] = {
 195                 .header_type    = IW_HEADER_TYPE_PARAM,
 196         },
 197         [IW_IOCTL_IDX(SIOCSIWRETRY)] = {
 198                 .header_type    = IW_HEADER_TYPE_PARAM,
 199         },
 200         [IW_IOCTL_IDX(SIOCGIWRETRY)] = {
 201                 .header_type    = IW_HEADER_TYPE_PARAM,
 202         },
 203         [IW_IOCTL_IDX(SIOCSIWENCODE)] = {
 204                 .header_type    = IW_HEADER_TYPE_POINT,
 205                 .token_size     = 1,
 206                 .max_tokens     = IW_ENCODING_TOKEN_MAX,
 207                 .flags          = IW_DESCR_FLAG_EVENT | IW_DESCR_FLAG_RESTRICT,
 208         },
 209         [IW_IOCTL_IDX(SIOCGIWENCODE)] = {
 210                 .header_type    = IW_HEADER_TYPE_POINT,
 211                 .token_size     = 1,
 212                 .max_tokens     = IW_ENCODING_TOKEN_MAX,
 213                 .flags          = IW_DESCR_FLAG_DUMP | IW_DESCR_FLAG_RESTRICT,
 214         },
 215         [IW_IOCTL_IDX(SIOCSIWPOWER)] = {
 216                 .header_type    = IW_HEADER_TYPE_PARAM,
 217         },
 218         [IW_IOCTL_IDX(SIOCGIWPOWER)] = {
 219                 .header_type    = IW_HEADER_TYPE_PARAM,
 220         },
 221         [IW_IOCTL_IDX(SIOCSIWGENIE)] = {
 222                 .header_type    = IW_HEADER_TYPE_POINT,
 223                 .token_size     = 1,
 224                 .max_tokens     = IW_GENERIC_IE_MAX,
 225         },
 226         [IW_IOCTL_IDX(SIOCGIWGENIE)] = {
 227                 .header_type    = IW_HEADER_TYPE_POINT,
 228                 .token_size     = 1,
 229                 .max_tokens     = IW_GENERIC_IE_MAX,
 230         },
 231         [IW_IOCTL_IDX(SIOCSIWAUTH)] = {
 232                 .header_type    = IW_HEADER_TYPE_PARAM,
 233         },
 234         [IW_IOCTL_IDX(SIOCGIWAUTH)] = {
 235                 .header_type    = IW_HEADER_TYPE_PARAM,
 236         },
 237         [IW_IOCTL_IDX(SIOCSIWENCODEEXT)] = {
 238                 .header_type    = IW_HEADER_TYPE_POINT,
 239                 .token_size     = 1,
 240                 .min_tokens     = sizeof(struct iw_encode_ext),
 241                 .max_tokens     = sizeof(struct iw_encode_ext) +
 242                                   IW_ENCODING_TOKEN_MAX,
 243         },
 244         [IW_IOCTL_IDX(SIOCGIWENCODEEXT)] = {
 245                 .header_type    = IW_HEADER_TYPE_POINT,
 246                 .token_size     = 1,
 247                 .min_tokens     = sizeof(struct iw_encode_ext),
 248                 .max_tokens     = sizeof(struct iw_encode_ext) +
 249                                   IW_ENCODING_TOKEN_MAX,
 250         },
 251         [IW_IOCTL_IDX(SIOCSIWPMKSA)] = {
 252                 .header_type    = IW_HEADER_TYPE_POINT,
 253                 .token_size     = 1,
 254                 .min_tokens     = sizeof(struct iw_pmksa),
 255                 .max_tokens     = sizeof(struct iw_pmksa),
 256         },
 257 };
 258 static const unsigned standard_ioctl_num = ARRAY_SIZE(standard_ioctl);
 259
 260 /*
 261  * Meta-data about all the additional standard Wireless Extension events
 262  * we know about.
 263  */
 264 static const struct iw_ioctl_description standard_event[] = {
 265         [IW_EVENT_IDX(IWEVTXDROP)] = {
 266                 .header_type    = IW_HEADER_TYPE_ADDR,
 267         },
 268         [IW_EVENT_IDX(IWEVQUAL)] = {
 269                 .header_type    = IW_HEADER_TYPE_QUAL,
 270         },
 271         [IW_EVENT_IDX(IWEVCUSTOM)] = {
 272                 .header_type    = IW_HEADER_TYPE_POINT,
 273                 .token_size     = 1,
 274                 .max_tokens     = IW_CUSTOM_MAX,
 275         },
 276         [IW_EVENT_IDX(IWEVREGISTERED)] = {
 277                 .header_type    = IW_HEADER_TYPE_ADDR,
 278         },
 279         [IW_EVENT_IDX(IWEVEXPIRED)] = {
 280                 .header_type    = IW_HEADER_TYPE_ADDR,
 281         },
 282         [IW_EVENT_IDX(IWEVGENIE)] = {
 283                 .header_type    = IW_HEADER_TYPE_POINT,
 284                 .token_size     = 1,
 285                 .max_tokens     = IW_GENERIC_IE_MAX,
 286         },
 287         [IW_EVENT_IDX(IWEVMICHAELMICFAILURE)] = {
 288                 .header_type    = IW_HEADER_TYPE_POINT,
 289                 .token_size     = 1,
 290                 .max_tokens     = sizeof(struct iw_michaelmicfailure),
 291         },
 292         [IW_EVENT_IDX(IWEVASSOCREQIE)] = {
 293                 .header_type    = IW_HEADER_TYPE_POINT,
 294                 .token_size     = 1,
 295                 .max_tokens     = IW_GENERIC_IE_MAX,
 296         },
 297         [IW_EVENT_IDX(IWEVASSOCRESPIE)] = {
 298                 .header_type    = IW_HEADER_TYPE_POINT,
 299                 .token_size     = 1,
 300                 .max_tokens     = IW_GENERIC_IE_MAX,
 301         },
 302         [IW_EVENT_IDX(IWEVPMKIDCAND)] = {
 303                 .header_type    = IW_HEADER_TYPE_POINT,
 304                 .token_size     = 1,
 305                 .max_tokens     = sizeof(struct iw_pmkid_cand),
 306         },
 307 };
 308 static const unsigned standard_event_num = ARRAY_SIZE(standard_event);
 309
 310 /* Size (in bytes) of various events */
 311 static const int event_type_size[] = {
 312         IW_EV_LCP_LEN,                  /* IW_HEADER_TYPE_NULL */
 313         0,
 314         IW_EV_CHAR_LEN,                 /* IW_HEADER_TYPE_CHAR */
 315         0,
 316         IW_EV_UINT_LEN,                 /* IW_HEADER_TYPE_UINT */
 317         IW_EV_FREQ_LEN,                 /* IW_HEADER_TYPE_FREQ */
 318         IW_EV_ADDR_LEN,                 /* IW_HEADER_TYPE_ADDR */
 319         0,
 320         IW_EV_POINT_LEN,                /* Without variable payload */
 321         IW_EV_PARAM_LEN,                /* IW_HEADER_TYPE_PARAM */
 322         IW_EV_QUAL_LEN,                 /* IW_HEADER_TYPE_QUAL */
 323 };
 324
 325 #ifdef CONFIG_COMPAT
 326 static const int compat_event_type_size[] = {
 327         IW_EV_COMPAT_LCP_LEN,           /* IW_HEADER_TYPE_NULL */
 328         0,
 329         IW_EV_COMPAT_CHAR_LEN,          /* IW_HEADER_TYPE_CHAR */
 330         0,
 331         IW_EV_COMPAT_UINT_LEN,          /* IW_HEADER_TYPE_UINT */
 332         IW_EV_COMPAT_FREQ_LEN,          /* IW_HEADER_TYPE_FREQ */
 333         IW_EV_COMPAT_ADDR_LEN,          /* IW_HEADER_TYPE_ADDR */
 334         0,
 335         IW_EV_COMPAT_POINT_LEN,         /* Without variable payload */
 336         IW_EV_COMPAT_PARAM_LEN,         /* IW_HEADER_TYPE_PARAM */
 337         IW_EV_COMPAT_QUAL_LEN,          /* IW_HEADER_TYPE_QUAL */
 338 };
 339 #endif
 340
 341
 342 /* IW event code */
 343
 344 static int __net_init wext_pernet_init(struct net *net)
 345 {
 346         skb_queue_head_init(&net->wext_nlevents);
 347         return 0;
 348 }
 349
 350 static void __net_exit wext_pernet_exit(struct net *net)
 351 {
 352         skb_queue_purge(&net->wext_nlevents);
 353 }
 354
 355 static struct pernet_operations wext_pernet_ops = {
 356         .init = wext_pernet_init,
 357         .exit = wext_pernet_exit,
 358 };
 359
 360 static int __init wireless_nlevent_init(void)
 361 {
 362         return register_pernet_subsys(&wext_pernet_ops);
 363 }
 364
 365 subsys_initcall(wireless_nlevent_init);
 366
 367 /* Process events generated by the wireless layer or the driver. */
 368 static void wireless_nlevent_process(struct work_struct *work)
 369 {
 370         struct sk_buff *skb;
 371         struct net *net;
 372
 373         rtnl_lock();
 374
 375         for_each_net(net) {
 376                 while ((skb = skb_dequeue(&net->wext_nlevents)))
 377                         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL,
 378                                     GFP_KERNEL);
 379         }
 380
 381         rtnl_unlock();
 382 }
 383
 384 static DECLARE_WORK(wireless_nlevent_work, wireless_nlevent_process);
 385
 386 static struct nlmsghdr *rtnetlink_ifinfo_prep(struct net_device *dev,
 387                                               struct sk_buff *skb)
 388 {
 389         struct ifinfomsg *r;
 390         struct nlmsghdr  *nlh;
 391
 392         nlh = nlmsg_put(skb, 0, 0, RTM_NEWLINK, sizeof(*r), 0);
 393         if (!nlh)
 394                 return NULL;
 395
 396         r = nlmsg_data(nlh);
 397         r->ifi_family = AF_UNSPEC;
 398         r->__ifi_pad = 0;
 399         r->ifi_type = dev->type;
 400         r->ifi_index = dev->ifindex;
 401         r->ifi_flags = dev_get_flags(dev);
 402         r->ifi_change = 0;      /* Wireless changes don't affect those flags */
 403
 404         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
 405
 406         return nlh;
 407  nla_put_failure:
 408         nlmsg_cancel(skb, nlh);
 409         return NULL;
 410 }
 411
 412
 413 /*
 414  * Main event dispatcher. Called from other parts and drivers.
 415  * Send the event on the appropriate channels.
 416  * May be called from interrupt context.
 417  */
 418 void wireless_send_event(struct net_device *    dev,
 419                          unsigned int           cmd,
 420                          union iwreq_data *     wrqu,
 421                          const char *           extra)
 422 {
 423         const struct iw_ioctl_description *     descr = NULL;
 424         int extra_len = 0;
 425         struct iw_event  *event;                /* Mallocated whole event */
 426         int event_len;                          /* Its size */
 427         int hdr_len;                            /* Size of the event header */
 428         int wrqu_off = 0;                       /* Offset in wrqu */
 429         /* Don't "optimise" the following variable, it will crash */
 430         unsigned        cmd_index;              /* *MUST* be unsigned */
 431         struct sk_buff *skb;
 432         struct nlmsghdr *nlh;
 433         struct nlattr *nla;
 434 #ifdef CONFIG_COMPAT
 435         struct __compat_iw_event *compat_event;
 436         struct compat_iw_point compat_wrqu;
 437         struct sk_buff *compskb;
 438 #endif
 439
 440         /*
 441          * Nothing in the kernel sends scan events with data, be safe.
 442          * This is necessary because we cannot fix up scan event data
 443          * for compat, due to being contained in 'extra', but normally
 444          * applications are required to retrieve the scan data anyway
 445          * and no data is included in the event, this codifies that
 446          * practice.
 447          */
 448         if (WARN_ON(cmd == SIOCGIWSCAN && extra))
 449                 extra = NULL;
 450
 451         /* Get the description of the Event */
 452         if (cmd <= SIOCIWLAST) {
 453                 cmd_index = IW_IOCTL_IDX(cmd);
 454                 if (cmd_index < standard_ioctl_num)
 455                         descr = &(standard_ioctl[cmd_index]);
 456         } else {
 457                 cmd_index = IW_EVENT_IDX(cmd);
 458                 if (cmd_index < standard_event_num)
 459                         descr = &(standard_event[cmd_index]);
 460         }
 461         /* Don't accept unknown events */
 462         if (descr == NULL) {
 463                 /* Note : we don't return an error to the driver, because
 464                  * the driver would not know what to do about it. It can't
 465                  * return an error to the user, because the event is not
 466                  * initiated by a user request.
 467                  * The best the driver could do is to log an error message.
 468                  * We will do it ourselves instead...
 469                  */
 470                 printk(KERN_ERR "%s (WE) : Invalid/Unknown Wireless Event (0x%04X)\n",
 471                        dev->name, cmd);
 472                 return;
 473         }
 474
 475         /* Check extra parameters and set extra_len */
 476         if (descr->header_type == IW_HEADER_TYPE_POINT) {
 477                 /* Check if number of token fits within bounds */
 478                 if (wrqu->data.length > descr->max_tokens) {
 479                         printk(KERN_ERR "%s (WE) : Wireless Event too big (%d)\n", dev->name, wrqu->data.length);
 480                         return;
 481                 }
 482                 if (wrqu->data.length < descr->min_tokens) {
 483                         printk(KERN_ERR "%s (WE) : Wireless Event too small (%d)\n", dev->name, wrqu->data.length);
 484                         return;
 485                 }
 486                 /* Calculate extra_len - extra is NULL for restricted events */
 487                 if (extra != NULL)
 488                         extra_len = wrqu->data.length * descr->token_size;
 489                 /* Always at an offset in wrqu */
 490                 wrqu_off = IW_EV_POINT_OFF;
 491         }
 492
 493         /* Total length of the event */
 494         hdr_len = event_type_size[descr->header_type];
 495         event_len = hdr_len + extra_len;
 496
 497         /*
 498          * The problem for 64/32 bit.
 499          *
 500          * On 64-bit, a regular event is laid out as follows:
 501          *      |  0  |  1  |  2  |  3  |  4  |  5  |  6  |  7  |
 502          *      | event.len | event.cmd |     p a d d i n g     |
 503          *      | wrqu data ... (with the correct size)         |
 504          *
 505          * This padding exists because we manipulate event->u,
 506          * and 'event' is not packed.
 507          *
 508          * An iw_point event is laid out like this instead:
 509          *      |  0  |  1  |  2  |  3  |  4  |  5  |  6  |  7  |
 510          *      | event.len | event.cmd |     p a d d i n g     |
 511          *      | iwpnt.len | iwpnt.flg |     p a d d i n g     |
 512          *      | extra data  ...
 513          *
 514          * The second padding exists because struct iw_point is extended,
 515          * but this depends on the platform...
 516          *
 517          * On 32-bit, all the padding shouldn't be there.
 518          */
 519
 520         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
 521         if (!skb)
 522                 return;
 523
 524         /* Send via the RtNetlink event channel */
 525         nlh = rtnetlink_ifinfo_prep(dev, skb);
 526         if (WARN_ON(!nlh)) {
 527                 kfree_skb(skb);
 528                 return;
 529         }
 530
 531         /* Add the wireless events in the netlink packet */
 532         nla = nla_reserve(skb, IFLA_WIRELESS, event_len);
 533         if (!nla) {
 534                 kfree_skb(skb);
 535                 return;
 536         }
 537         event = nla_data(nla);
 538
 539         /* Fill event - first clear to avoid data leaking */
 540         memset(event, 0, hdr_len);
 541         event->len = event_len;
 542         event->cmd = cmd;
 543         memcpy(&event->u, ((char *) wrqu) + wrqu_off, hdr_len - IW_EV_LCP_LEN);
 544         if (extra_len)
 545                 memcpy(((char *) event) + hdr_len, extra, extra_len);
 546
 547         nlmsg_end(skb, nlh);
 548 #ifdef CONFIG_COMPAT
 549         hdr_len = compat_event_type_size[descr->header_type];
 550         event_len = hdr_len + extra_len;
 551
 552         compskb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
 553         if (!compskb) {
 554                 kfree_skb(skb);
 555                 return;
 556         }
 557
 558         /* Send via the RtNetlink event channel */
 559         nlh = rtnetlink_ifinfo_prep(dev, compskb);
 560         if (WARN_ON(!nlh)) {
 561                 kfree_skb(skb);
 562                 kfree_skb(compskb);
 563                 return;
 564         }
 565
 566         /* Add the wireless events in the netlink packet */
 567         nla = nla_reserve(compskb, IFLA_WIRELESS, event_len);
 568         if (!nla) {
 569                 kfree_skb(skb);
 570                 kfree_skb(compskb);
 571                 return;
 572         }
 573         compat_event = nla_data(nla);
 574
 575         compat_event->len = event_len;
 576         compat_event->cmd = cmd;
 577         if (descr->header_type == IW_HEADER_TYPE_POINT) {
 578                 compat_wrqu.length = wrqu->data.length;
 579                 compat_wrqu.flags = wrqu->data.flags;
 580                 memcpy(&compat_event->pointer,
 581                         ((char *) &compat_wrqu) + IW_EV_COMPAT_POINT_OFF,
 582                         hdr_len - IW_EV_COMPAT_LCP_LEN);
 583                 if (extra_len)
 584                         memcpy(((char *) compat_event) + hdr_len,
 585                                 extra, extra_len);
 586         } else {
 587                 /* extra_len must be zero, so no if (extra) needed */
 588                 memcpy(&compat_event->pointer, wrqu,
 589                         hdr_len - IW_EV_COMPAT_LCP_LEN);
 590         }
 591
 592         nlmsg_end(compskb, nlh);
 593
 594         skb_shinfo(skb)->frag_list = compskb;
 595 #endif
 596         skb_queue_tail(&dev_net(dev)->wext_nlevents, skb);
 597         schedule_work(&wireless_nlevent_work);
 598 }
 599 EXPORT_SYMBOL(wireless_send_event);
 600
 601
 602
 603 /* IW handlers */
 604
 605 struct iw_statistics *get_wireless_stats(struct net_device *dev)
 606 {
 607 #ifdef CONFIG_WIRELESS_EXT
 608         if ((dev->wireless_handlers != NULL) &&
 609            (dev->wireless_handlers->get_wireless_stats != NULL))
 610                 return dev->wireless_handlers->get_wireless_stats(dev);
 611 #endif
 612
 613 #ifdef CONFIG_CFG80211_WEXT
 614         if (dev->ieee80211_ptr &&
 615             dev->ieee80211_ptr->wiphy &&
 616             dev->ieee80211_ptr->wiphy->wext &&
 617             dev->ieee80211_ptr->wiphy->wext->get_wireless_stats)
 618                 return dev->ieee80211_ptr->wiphy->wext->get_wireless_stats(dev);
 619 #endif
 620
 621         /* not found */
 622         return NULL;
 623 }
 624
 625 static int iw_handler_get_iwstats(struct net_device *           dev,
 626                                   struct iw_request_info *      info,
 627                                   union iwreq_data *            wrqu,
 628                                   char *                        extra)
 629 {
 630         /* Get stats from the driver */
 631         struct iw_statistics *stats;
 632
 633         stats = get_wireless_stats(dev);
 634         if (stats) {
 635                 /* Copy statistics to extra */
 636                 memcpy(extra, stats, sizeof(struct iw_statistics));
 637                 wrqu->data.length = sizeof(struct iw_statistics);
 638
 639                 /* Check if we need to clear the updated flag */
 640                 if (wrqu->data.flags != 0)
 641                         stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
 642                 return 0;
 643         } else
 644                 return -EOPNOTSUPP;
 645 }
 646
 647 static iw_handler get_handler(struct net_device *dev, unsigned int cmd)
 648 {
 649         /* Don't "optimise" the following variable, it will crash */
 650         unsigned int    index;          /* *MUST* be unsigned */
 651         const struct iw_handler_def *handlers = NULL;
 652
 653 #ifdef CONFIG_CFG80211_WEXT
 654         if (dev->ieee80211_ptr && dev->ieee80211_ptr->wiphy)
 655                 handlers = dev->ieee80211_ptr->wiphy->wext;
 656 #endif
 657 #ifdef CONFIG_WIRELESS_EXT
 658         if (dev->wireless_handlers)
 659                 handlers = dev->wireless_handlers;
 660 #endif
 661
 662         if (!handlers)
 663                 return NULL;
 664
 665         /* Try as a standard command */
 666         index = IW_IOCTL_IDX(cmd);
 667         if (index < handlers->num_standard)
 668                 return handlers->standard[index];
 669
 670 #ifdef CONFIG_WEXT_PRIV
 671         /* Try as a private command */
 672         index = cmd - SIOCIWFIRSTPRIV;
 673         if (index < handlers->num_private)
 674                 return handlers->private[index];
 675 #endif
 676
 677         /* Not found */
 678         return NULL;
 679 }
 680
 681 static int ioctl_standard_iw_point(struct iw_point *iwp, unsigned int cmd,
 682                                    const struct iw_ioctl_description *descr,
 683                                    iw_handler handler, struct net_device *dev,
 684                                    struct iw_request_info *info)
 685 {
 686         int err, extra_size, user_length = 0, essid_compat = 0;
 687         char *extra;
 688
 689         /* Calculate space needed by arguments. Always allocate
 690          * for max space.
 691          */
 692         extra_size = descr->max_tokens * descr->token_size;
 693
 694         /* Check need for ESSID compatibility for WE < 21 */
 695         switch (cmd) {
 696         case SIOCSIWESSID:
 697         case SIOCGIWESSID:
 698         case SIOCSIWNICKN:
 699         case SIOCGIWNICKN:
 700                 if (iwp->length == descr->max_tokens + 1)
 701                         essid_compat = 1;
 702                 else if (IW_IS_SET(cmd) && (iwp->length != 0)) {
 703                         char essid[IW_ESSID_MAX_SIZE + 1];
 704                         unsigned int len;
 705                         len = iwp->length * descr->token_size;
 706
 707                         if (len > IW_ESSID_MAX_SIZE)
 708                                 return -EFAULT;
 709
 710                         err = copy_from_user(essid, iwp->pointer, len);
 711                         if (err)
 712                                 return -EFAULT;
 713
 714                         if (essid[iwp->length - 1] == '\0')
 715                                 essid_compat = 1;
 716                 }
 717                 break;
 718         default:
 719                 break;
 720         }
 721
 722         iwp->length -= essid_compat;
 723
 724         /* Check what user space is giving us */
 725         if (IW_IS_SET(cmd)) {
 726                 /* Check NULL pointer */
 727                 if (!iwp->pointer && iwp->length != 0)
 728                         return -EFAULT;
 729                 /* Check if number of token fits within bounds */
 730                 if (iwp->length > descr->max_tokens)
 731                         return -E2BIG;
 732                 if (iwp->length < descr->min_tokens)
 733                         return -EINVAL;
 734         } else {
 735                 /* Check NULL pointer */
 736                 if (!iwp->pointer)
 737                         return -EFAULT;
 738                 /* Save user space buffer size for checking */
 739                 user_length = iwp->length;
 740
 741                 /* Don't check if user_length > max to allow forward
 742                  * compatibility. The test user_length < min is
 743                  * implied by the test at the end.
 744                  */
 745
 746                 /* Support for very large requests */
 747                 if ((descr->flags & IW_DESCR_FLAG_NOMAX) &&
 748                     (user_length > descr->max_tokens)) {
 749                         /* Allow userspace to GET more than max so
 750                          * we can support any size GET requests.
 751                          * There is still a limit : -ENOMEM.
 752                          */
 753                         extra_size = user_length * descr->token_size;
 754
 755                         /* Note : user_length is originally a __u16,
 756                          * and token_size is controlled by us,
 757                          * so extra_size won't get negative and
 758                          * won't overflow...
 759                          */
 760                 }
 761         }
 762
 763         /* kzalloc() ensures NULL-termination for essid_compat. */
 764         extra = kzalloc(extra_size, GFP_KERNEL);
 765         if (!extra)
 766                 return -ENOMEM;
 767
 768         /* If it is a SET, get all the extra data in here */
 769         if (IW_IS_SET(cmd) && (iwp->length != 0)) {
 770                 if (copy_from_user(extra, iwp->pointer,
 771                                    iwp->length *
 772                                    descr->token_size)) {
 773                         err = -EFAULT;
 774                         goto out;
 775                 }
 776
 777                 if (cmd == SIOCSIWENCODEEXT) {
 778                         struct iw_encode_ext *ee = (void *) extra;
 779
 780                         if (iwp->length < sizeof(*ee) + ee->key_len)
 781                                 return -EFAULT;
 782                 }
 783         }
 784
 785         if (IW_IS_GET(cmd) && !(descr->flags & IW_DESCR_FLAG_NOMAX)) {
 786                 /*
 787                  * If this is a GET, but not NOMAX, it means that the extra
 788                  * data is not bounded by userspace, but by max_tokens. Thus
 789                  * set the length to max_tokens. This matches the extra data
 790                  * allocation.
 791                  * The driver should fill it with the number of tokens it
 792                  * provided, and it may check iwp->length rather than having
 793                  * knowledge of max_tokens. If the driver doesn't change the
 794                  * iwp->length, this ioctl just copies back max_token tokens
 795                  * filled with zeroes. Hopefully the driver isn't claiming
 796                  * them to be valid data.
 797                  */
 798                 iwp->length = descr->max_tokens;
 799         }
 800
 801         err = handler(dev, info, (union iwreq_data *) iwp, extra);
 802
 803         iwp->length += essid_compat;
 804
 805         /* If we have something to return to the user */
 806         if (!err && IW_IS_GET(cmd)) {
 807                 /* Check if there is enough buffer up there */
 808                 if (user_length < iwp->length) {
 809                         err = -E2BIG;
 810                         goto out;
 811                 }
 812
 813                 if (copy_to_user(iwp->pointer, extra,
 814                                  iwp->length *
 815                                  descr->token_size)) {
 816                         err = -EFAULT;
 817                         goto out;
 818                 }
 819         }
 820
 821         /* Generate an event to notify listeners of the change */
 822         if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
 823             ((err == 0) || (err == -EIWCOMMIT))) {
 824                 union iwreq_data *data = (union iwreq_data *) iwp;
 825
 826                 if (descr->flags & IW_DESCR_FLAG_RESTRICT)
 827                         /* If the event is restricted, don't
 828                          * export the payload.
 829                          */
 830                         wireless_send_event(dev, cmd, data, NULL);
 831                 else
 832                         wireless_send_event(dev, cmd, data, extra);
 833         }
 834
 835 out:
 836         kfree(extra);
 837         return err;
 838 }
 839
 840 /*
 841  * Call the commit handler in the driver
 842  * (if exist and if conditions are right)
 843  *
 844  * Note : our current commit strategy is currently pretty dumb,
 845  * but we will be able to improve on that...
 846  * The goal is to try to agreagate as many changes as possible
 847  * before doing the commit. Drivers that will define a commit handler
 848  * are usually those that need a reset after changing parameters, so
 849  * we want to minimise the number of reset.
 850  * A cool idea is to use a timer : at each "set" command, we re-set the
 851  * timer, when the timer eventually fires, we call the driver.
 852  * Hopefully, more on that later.
 853  *
 854  * Also, I'm waiting to see how many people will complain about the
 855  * netif_running(dev) test. I'm open on that one...
 856  * Hopefully, the driver will remember to do a commit in "open()" ;-)
 857  */
 858 int call_commit_handler(struct net_device *dev)
 859 {
 860 #ifdef CONFIG_WIRELESS_EXT
 861         if ((netif_running(dev)) &&
 862            (dev->wireless_handlers->standard[0] != NULL))
 863                 /* Call the commit handler on the driver */
 864                 return dev->wireless_handlers->standard[0](dev, NULL,
 865                                                            NULL, NULL);
 866         else
 867                 return 0;               /* Command completed successfully */
 868 #else
 869         /* cfg80211 has no commit */
 870         return 0;
 871 #endif
 872 }
 873
 874 /*
 875  * Main IOCTl dispatcher.
 876  * Check the type of IOCTL and call the appropriate wrapper...
 877  */
 878 static int wireless_process_ioctl(struct net *net, struct ifreq *ifr,
 879                                   unsigned int cmd,
 880                                   struct iw_request_info *info,
 881                                   wext_ioctl_func standard,
 882                                   wext_ioctl_func private)
 883 {
 884         struct iwreq *iwr = (struct iwreq *) ifr;
 885         struct net_device *dev;
 886         iw_handler      handler;
 887
 888         /* Permissions are already checked in dev_ioctl() before calling us.
 889          * The copy_to/from_user() of ifr is also dealt with in there */
 890
 891         /* Make sure the device exist */
 892         if ((dev = __dev_get_by_name(net, ifr->ifr_name)) == NULL)
 893                 return -ENODEV;
 894
 895         /* A bunch of special cases, then the generic case...
 896          * Note that 'cmd' is already filtered in dev_ioctl() with
 897          * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */
 898         if (cmd == SIOCGIWSTATS)
 899                 return standard(dev, iwr, cmd, info,
 900                                 &iw_handler_get_iwstats);
 901
 902 #ifdef CONFIG_WEXT_PRIV
 903         if (cmd == SIOCGIWPRIV && dev->wireless_handlers)
 904                 return standard(dev, iwr, cmd, info,
 905                                 iw_handler_get_private);
 906 #endif
 907
 908         /* Basic check */
 909         if (!netif_device_present(dev))
 910                 return -ENODEV;
 911
 912         /* New driver API : try to find the handler */
 913         handler = get_handler(dev, cmd);
 914         if (handler) {
 915                 /* Standard and private are not the same */
 916                 if (cmd < SIOCIWFIRSTPRIV)
 917                         return standard(dev, iwr, cmd, info, handler);
 918                 else if (private)
 919                         return private(dev, iwr, cmd, info, handler);
 920         }
 921         /* Old driver API : call driver ioctl handler */
 922         if (dev->netdev_ops->ndo_do_ioctl)
 923                 return dev->netdev_ops->ndo_do_ioctl(dev, ifr, cmd);
 924         return -EOPNOTSUPP;
 925 }
 926
 927 /* If command is `set a parameter', or `get the encoding parameters',
 928  * check if the user has the right to do it.
 929  */
 930 static int wext_permission_check(unsigned int cmd)
 931 {
 932         if ((IW_IS_SET(cmd) || cmd == SIOCGIWENCODE ||
 933              cmd == SIOCGIWENCODEEXT) &&
 934             !capable(CAP_NET_ADMIN))
 935                 return -EPERM;
 936
 937         return 0;
 938 }
 939
 940 /* entry point from dev ioctl */
 941 static int wext_ioctl_dispatch(struct net *net, struct ifreq *ifr,
 942                                unsigned int cmd, struct iw_request_info *info,
 943                                wext_ioctl_func standard,
 944                                wext_ioctl_func private)
 945 {
 946         int ret = wext_permission_check(cmd);
 947
 948         if (ret)
 949                 return ret;
 950
 951         dev_load(net, ifr->ifr_name);
 952         rtnl_lock();
 953         ret = wireless_process_ioctl(net, ifr, cmd, info, standard, private);
 954         rtnl_unlock();
 955
 956         return ret;
 957 }
 958
 959 /*
 960  * Wrapper to call a standard Wireless Extension handler.
 961  * We do various checks and also take care of moving data between
 962  * user space and kernel space.
 963  */
 964 static int ioctl_standard_call(struct net_device *      dev,
 965                                struct iwreq             *iwr,
 966                                unsigned int             cmd,
 967                                struct iw_request_info   *info,
 968                                iw_handler               handler)
 969 {
 970         const struct iw_ioctl_description *     descr;
 971         int                                     ret = -EINVAL;
 972
 973         /* Get the description of the IOCTL */
 974         if (IW_IOCTL_IDX(cmd) >= standard_ioctl_num)
 975                 return -EOPNOTSUPP;
 976         descr = &(standard_ioctl[IW_IOCTL_IDX(cmd)]);
 977
 978         /* Check if we have a pointer to user space data or not */
 979         if (descr->header_type != IW_HEADER_TYPE_POINT) {
 980
 981                 /* No extra arguments. Trivial to handle */
 982                 ret = handler(dev, info, &(iwr->u), NULL);
 983
 984                 /* Generate an event to notify listeners of the change */
 985                 if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
 986                    ((ret == 0) || (ret == -EIWCOMMIT)))
 987                         wireless_send_event(dev, cmd, &(iwr->u), NULL);
 988         } else {
 989                 ret = ioctl_standard_iw_point(&iwr->u.data, cmd, descr,
 990                                               handler, dev, info);
 991         }
 992
 993         /* Call commit handler if needed and defined */
 994         if (ret == -EIWCOMMIT)
 995                 ret = call_commit_handler(dev);
 996
 997         /* Here, we will generate the appropriate event if needed */
 998
 999         return ret;
1000 }
1001
1002
1003 int wext_handle_ioctl(struct net *net, struct ifreq *ifr, unsigned int cmd,
1004                       void __user *arg)
1005 {
1006         struct iw_request_info info = { .cmd = cmd, .flags = 0 };
1007         int ret;
1008
1009         ret = wext_ioctl_dispatch(net, ifr, cmd, &info,
1010                                   ioctl_standard_call,
1011                                   ioctl_private_call);
1012         if (ret >= 0 &&
1013             IW_IS_GET(cmd) &&
1014             copy_to_user(arg, ifr, sizeof(struct iwreq)))
1015                 return -EFAULT;
1016
1017         return ret;
1018 }
1019
1020 #ifdef CONFIG_COMPAT
1021 static int compat_standard_call(struct net_device       *dev,
1022                                 struct iwreq            *iwr,
1023                                 unsigned int            cmd,
1024                                 struct iw_request_info  *info,
1025                                 iw_handler              handler)
1026 {
1027         const struct iw_ioctl_description *descr;
1028         struct compat_iw_point *iwp_compat;
1029         struct iw_point iwp;
1030         int err;
1031
1032         descr = standard_ioctl + IW_IOCTL_IDX(cmd);
1033
1034         if (descr->header_type != IW_HEADER_TYPE_POINT)
1035                 return ioctl_standard_call(dev, iwr, cmd, info, handler);
1036
1037         iwp_compat = (struct compat_iw_point *) &iwr->u.data;
1038         iwp.pointer = compat_ptr(iwp_compat->pointer);
1039         iwp.length = iwp_compat->length;
1040         iwp.flags = iwp_compat->flags;
1041
1042         err = ioctl_standard_iw_point(&iwp, cmd, descr, handler, dev, info);
1043
1044         iwp_compat->pointer = ptr_to_compat(iwp.pointer);
1045         iwp_compat->length = iwp.length;
1046         iwp_compat->flags = iwp.flags;
1047
1048         return err;
1049 }
1050
1051 int compat_wext_handle_ioctl(struct net *net, unsigned int cmd,
1052                              unsigned long arg)
1053 {
1054         void __user *argp = (void __user *)arg;
1055         struct iw_request_info info;
1056         struct iwreq iwr;
1057         char *colon;
1058         int ret;
1059
1060         if (copy_from_user(&iwr, argp, sizeof(struct iwreq)))
1061                 return -EFAULT;
1062
1063         iwr.ifr_name[IFNAMSIZ-1] = 0;
1064         colon = strchr(iwr.ifr_name, ':');
1065         if (colon)
1066                 *colon = 0;
1067
1068         info.cmd = cmd;
1069         info.flags = IW_REQUEST_FLAG_COMPAT;
1070
1071         ret = wext_ioctl_dispatch(net, (struct ifreq *) &iwr, cmd, &info,
1072                                   compat_standard_call,
1073                                   compat_private_call);
1074
1075         if (ret >= 0 &&
1076             IW_IS_GET(cmd) &&
1077             copy_to_user(argp, &iwr, sizeof(struct iwreq)))
1078                 return -EFAULT;
1079
1080         return ret;
1081 }
1082 #endif