net/wireless/wext-core.c

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
wireless_nlevent_flush
wext_netdev_notifier_call
wext_pernet_init
wext_pernet_exit
wireless_nlevent_init
wireless_nlevent_process
rtnetlink_ifinfo_prep
wireless_send_event
get_wireless_stats
iw_handler_get_iwstats
get_handler
ioctl_standard_iw_point
call_commit_handler
wireless_process_ioctl
wext_permission_check
wext_ioctl_dispatch
ioctl_standard_call
wext_handle_ioctl
compat_standard_call
compat_wext_handle_ioctl
iwe_stream_add_event
iwe_stream_add_point
iwe_stream_add_value
   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 
  23 typedef 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  */
  32 static 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 };
 259 static 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  */
 265 static 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 };
 309 static const unsigned int standard_event_num = ARRAY_SIZE(standard_event);
 310 
 311 /* Size (in bytes) of various events */
 312 static 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
 327 static 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 
 345 void wireless_nlevent_flush(void)
 346 {
 347         struct sk_buff *skb;
 348         struct net *net;
 349 
 350         down_read(&net_rwsem);
 351         for_each_net(net) {
 352                 while ((skb = skb_dequeue(&net->wext_nlevents)))
 353                         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL,
 354                                     GFP_KERNEL);
 355         }
 356         up_read(&net_rwsem);
 357 }
 358 EXPORT_SYMBOL_GPL(wireless_nlevent_flush);
 359 
 360 static 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 
 375 static struct notifier_block wext_netdev_notifier = {
 376         .notifier_call = wext_netdev_notifier_call,
 377 };
 378 
 379 static int __net_init wext_pernet_init(struct net *net)
 380 {
 381         skb_queue_head_init(&net->wext_nlevents);
 382         return 0;
 383 }
 384 
 385 static void __net_exit wext_pernet_exit(struct net *net)
 386 {
 387         skb_queue_purge(&net->wext_nlevents);
 388 }
 389 
 390 static struct pernet_operations wext_pernet_ops = {
 391         .init = wext_pernet_init,
 392         .exit = wext_pernet_exit,
 393 };
 394 
 395 static 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 
 408 subsys_initcall(wireless_nlevent_init);
 409 
 410 /* Process events generated by the wireless layer or the driver. */
 411 static void wireless_nlevent_process(struct work_struct *work)
 412 {
 413         wireless_nlevent_flush();
 414 }
 415 
 416 static DECLARE_WORK(wireless_nlevent_work, wireless_nlevent_process);
 417 
 418 static struct nlmsghdr *rtnetlink_ifinfo_prep(struct net_device *dev,
 419                                               struct sk_buff *skb)
 420 {
 421         struct ifinfomsg *r;
 422         struct nlmsghdr  *nlh;
 423 
 424         nlh = nlmsg_put(skb, 0, 0, RTM_NEWLINK, sizeof(*r), 0);
 425         if (!nlh)
 426                 return NULL;
 427 
 428         r = nlmsg_data(nlh);
 429         r->ifi_family = AF_UNSPEC;
 430         r->__ifi_pad = 0;
 431         r->ifi_type = dev->type;
 432         r->ifi_index = dev->ifindex;
 433         r->ifi_flags = dev_get_flags(dev);
 434         r->ifi_change = 0;      /* Wireless changes don't affect those flags */
 435 
 436         if (nla_put_string(skb, IFLA_IFNAME, dev->name))
 437                 goto nla_put_failure;
 438 
 439         return nlh;
 440  nla_put_failure:
 441         nlmsg_cancel(skb, nlh);
 442         return NULL;
 443 }
 444 
 445 
 446 /*
 447  * Main event dispatcher. Called from other parts and drivers.
 448  * Send the event on the appropriate channels.
 449  * May be called from interrupt context.
 450  */
 451 void wireless_send_event(struct net_device *    dev,
 452                          unsigned int           cmd,
 453                          union iwreq_data *     wrqu,
 454                          const char *           extra)
 455 {
 456         const struct iw_ioctl_description *     descr = NULL;
 457         int extra_len = 0;
 458         struct iw_event  *event;                /* Mallocated whole event */
 459         int event_len;                          /* Its size */
 460         int hdr_len;                            /* Size of the event header */
 461         int wrqu_off = 0;                       /* Offset in wrqu */
 462         /* Don't "optimise" the following variable, it will crash */
 463         unsigned int    cmd_index;              /* *MUST* be unsigned */
 464         struct sk_buff *skb;
 465         struct nlmsghdr *nlh;
 466         struct nlattr *nla;
 467 #ifdef CONFIG_COMPAT
 468         struct __compat_iw_event *compat_event;
 469         struct compat_iw_point compat_wrqu;
 470         struct sk_buff *compskb;
 471 #endif
 472 
 473         /*
 474          * Nothing in the kernel sends scan events with data, be safe.
 475          * This is necessary because we cannot fix up scan event data
 476          * for compat, due to being contained in 'extra', but normally
 477          * applications are required to retrieve the scan data anyway
 478          * and no data is included in the event, this codifies that
 479          * practice.
 480          */
 481         if (WARN_ON(cmd == SIOCGIWSCAN && extra))
 482                 extra = NULL;
 483 
 484         /* Get the description of the Event */
 485         if (cmd <= SIOCIWLAST) {
 486                 cmd_index = IW_IOCTL_IDX(cmd);
 487                 if (cmd_index < standard_ioctl_num)
 488                         descr = &(standard_ioctl[cmd_index]);
 489         } else {
 490                 cmd_index = IW_EVENT_IDX(cmd);
 491                 if (cmd_index < standard_event_num)
 492                         descr = &(standard_event[cmd_index]);
 493         }
 494         /* Don't accept unknown events */
 495         if (descr == NULL) {
 496                 /* Note : we don't return an error to the driver, because
 497                  * the driver would not know what to do about it. It can't
 498                  * return an error to the user, because the event is not
 499                  * initiated by a user request.
 500                  * The best the driver could do is to log an error message.
 501                  * We will do it ourselves instead...
 502                  */
 503                 netdev_err(dev, "(WE) : Invalid/Unknown Wireless Event (0x%04X)\n",
 504                            cmd);
 505                 return;
 506         }
 507 
 508         /* Check extra parameters and set extra_len */
 509         if (descr->header_type == IW_HEADER_TYPE_POINT) {
 510                 /* Check if number of token fits within bounds */
 511                 if (wrqu->data.length > descr->max_tokens) {
 512                         netdev_err(dev, "(WE) : Wireless Event (cmd=0x%04X) too big (%d)\n",
 513                                    cmd, wrqu->data.length);
 514                         return;
 515                 }
 516                 if (wrqu->data.length < descr->min_tokens) {
 517                         netdev_err(dev, "(WE) : Wireless Event (cmd=0x%04X) too small (%d)\n",
 518                                    cmd, wrqu->data.length);
 519                         return;
 520                 }
 521                 /* Calculate extra_len - extra is NULL for restricted events */
 522                 if (extra != NULL)
 523                         extra_len = wrqu->data.length * descr->token_size;
 524                 /* Always at an offset in wrqu */
 525                 wrqu_off = IW_EV_POINT_OFF;
 526         }
 527 
 528         /* Total length of the event */
 529         hdr_len = event_type_size[descr->header_type];
 530         event_len = hdr_len + extra_len;
 531 
 532         /*
 533          * The problem for 64/32 bit.
 534          *
 535          * On 64-bit, a regular event is laid out as follows:
 536          *      |  0  |  1  |  2  |  3  |  4  |  5  |  6  |  7  |
 537          *      | event.len | event.cmd |     p a d d i n g     |
 538          *      | wrqu data ... (with the correct size)         |
 539          *
 540          * This padding exists because we manipulate event->u,
 541          * and 'event' is not packed.
 542          *
 543          * An iw_point event is laid out like this instead:
 544          *      |  0  |  1  |  2  |  3  |  4  |  5  |  6  |  7  |
 545          *      | event.len | event.cmd |     p a d d i n g     |
 546          *      | iwpnt.len | iwpnt.flg |     p a d d i n g     |
 547          *      | extra data  ...
 548          *
 549          * The second padding exists because struct iw_point is extended,
 550          * but this depends on the platform...
 551          *
 552          * On 32-bit, all the padding shouldn't be there.
 553          */
 554 
 555         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
 556         if (!skb)
 557                 return;
 558 
 559         /* Send via the RtNetlink event channel */
 560         nlh = rtnetlink_ifinfo_prep(dev, skb);
 561         if (WARN_ON(!nlh)) {
 562                 kfree_skb(skb);
 563                 return;
 564         }
 565 
 566         /* Add the wireless events in the netlink packet */
 567         nla = nla_reserve(skb, IFLA_WIRELESS, event_len);
 568         if (!nla) {
 569                 kfree_skb(skb);
 570                 return;
 571         }
 572         event = nla_data(nla);
 573 
 574         /* Fill event - first clear to avoid data leaking */
 575         memset(event, 0, hdr_len);
 576         event->len = event_len;
 577         event->cmd = cmd;
 578         memcpy(&event->u, ((char *) wrqu) + wrqu_off, hdr_len - IW_EV_LCP_LEN);
 579         if (extra_len)
 580                 memcpy(((char *) event) + hdr_len, extra, extra_len);
 581 
 582         nlmsg_end(skb, nlh);
 583 #ifdef CONFIG_COMPAT
 584         hdr_len = compat_event_type_size[descr->header_type];
 585         event_len = hdr_len + extra_len;
 586 
 587         compskb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
 588         if (!compskb) {
 589                 kfree_skb(skb);
 590                 return;
 591         }
 592 
 593         /* Send via the RtNetlink event channel */
 594         nlh = rtnetlink_ifinfo_prep(dev, compskb);
 595         if (WARN_ON(!nlh)) {
 596                 kfree_skb(skb);
 597                 kfree_skb(compskb);
 598                 return;
 599         }
 600 
 601         /* Add the wireless events in the netlink packet */
 602         nla = nla_reserve(compskb, IFLA_WIRELESS, event_len);
 603         if (!nla) {
 604                 kfree_skb(skb);
 605                 kfree_skb(compskb);
 606                 return;
 607         }
 608         compat_event = nla_data(nla);
 609 
 610         compat_event->len = event_len;
 611         compat_event->cmd = cmd;
 612         if (descr->header_type == IW_HEADER_TYPE_POINT) {
 613                 compat_wrqu.length = wrqu->data.length;
 614                 compat_wrqu.flags = wrqu->data.flags;
 615                 memcpy(&compat_event->pointer,
 616                         ((char *) &compat_wrqu) + IW_EV_COMPAT_POINT_OFF,
 617                         hdr_len - IW_EV_COMPAT_LCP_LEN);
 618                 if (extra_len)
 619                         memcpy(((char *) compat_event) + hdr_len,
 620                                 extra, extra_len);
 621         } else {
 622                 /* extra_len must be zero, so no if (extra) needed */
 623                 memcpy(&compat_event->pointer, wrqu,
 624                         hdr_len - IW_EV_COMPAT_LCP_LEN);
 625         }
 626 
 627         nlmsg_end(compskb, nlh);
 628 
 629         skb_shinfo(skb)->frag_list = compskb;
 630 #endif
 631         skb_queue_tail(&dev_net(dev)->wext_nlevents, skb);
 632         schedule_work(&wireless_nlevent_work);
 633 }
 634 EXPORT_SYMBOL(wireless_send_event);
 635 
 636 
 637 
 638 /* IW handlers */
 639 
 640 struct iw_statistics *get_wireless_stats(struct net_device *dev)
 641 {
 642 #ifdef CONFIG_WIRELESS_EXT
 643         if ((dev->wireless_handlers != NULL) &&
 644            (dev->wireless_handlers->get_wireless_stats != NULL))
 645                 return dev->wireless_handlers->get_wireless_stats(dev);
 646 #endif
 647 
 648 #ifdef CONFIG_CFG80211_WEXT
 649         if (dev->ieee80211_ptr &&
 650             dev->ieee80211_ptr->wiphy &&
 651             dev->ieee80211_ptr->wiphy->wext &&
 652             dev->ieee80211_ptr->wiphy->wext->get_wireless_stats)
 653                 return dev->ieee80211_ptr->wiphy->wext->get_wireless_stats(dev);
 654 #endif
 655 
 656         /* not found */
 657         return NULL;
 658 }
 659 
 660 /* noinline to avoid a bogus warning with -O3 */
 661 static noinline int iw_handler_get_iwstats(struct net_device *  dev,
 662                                   struct iw_request_info *      info,
 663                                   union iwreq_data *            wrqu,
 664                                   char *                        extra)
 665 {
 666         /* Get stats from the driver */
 667         struct iw_statistics *stats;
 668 
 669         stats = get_wireless_stats(dev);
 670         if (stats) {
 671                 /* Copy statistics to extra */
 672                 memcpy(extra, stats, sizeof(struct iw_statistics));
 673                 wrqu->data.length = sizeof(struct iw_statistics);
 674 
 675                 /* Check if we need to clear the updated flag */
 676                 if (wrqu->data.flags != 0)
 677                         stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
 678                 return 0;
 679         } else
 680                 return -EOPNOTSUPP;
 681 }
 682 
 683 static iw_handler get_handler(struct net_device *dev, unsigned int cmd)
 684 {
 685         /* Don't "optimise" the following variable, it will crash */
 686         unsigned int    index;          /* *MUST* be unsigned */
 687         const struct iw_handler_def *handlers = NULL;
 688 
 689 #ifdef CONFIG_CFG80211_WEXT
 690         if (dev->ieee80211_ptr && dev->ieee80211_ptr->wiphy)
 691                 handlers = dev->ieee80211_ptr->wiphy->wext;
 692 #endif
 693 #ifdef CONFIG_WIRELESS_EXT
 694         if (dev->wireless_handlers)
 695                 handlers = dev->wireless_handlers;
 696 #endif
 697 
 698         if (!handlers)
 699                 return NULL;
 700 
 701         /* Try as a standard command */
 702         index = IW_IOCTL_IDX(cmd);
 703         if (index < handlers->num_standard)
 704                 return handlers->standard[index];
 705 
 706 #ifdef CONFIG_WEXT_PRIV
 707         /* Try as a private command */
 708         index = cmd - SIOCIWFIRSTPRIV;
 709         if (index < handlers->num_private)
 710                 return handlers->private[index];
 711 #endif
 712 
 713         /* Not found */
 714         return NULL;
 715 }
 716 
 717 static int ioctl_standard_iw_point(struct iw_point *iwp, unsigned int cmd,
 718                                    const struct iw_ioctl_description *descr,
 719                                    iw_handler handler, struct net_device *dev,
 720                                    struct iw_request_info *info)
 721 {
 722         int err, extra_size, user_length = 0, essid_compat = 0;
 723         char *extra;
 724 
 725         /* Calculate space needed by arguments. Always allocate
 726          * for max space.
 727          */
 728         extra_size = descr->max_tokens * descr->token_size;
 729 
 730         /* Check need for ESSID compatibility for WE < 21 */
 731         switch (cmd) {
 732         case SIOCSIWESSID:
 733         case SIOCGIWESSID:
 734         case SIOCSIWNICKN:
 735         case SIOCGIWNICKN:
 736                 if (iwp->length == descr->max_tokens + 1)
 737                         essid_compat = 1;
 738                 else if (IW_IS_SET(cmd) && (iwp->length != 0)) {
 739                         char essid[IW_ESSID_MAX_SIZE + 1];
 740                         unsigned int len;
 741                         len = iwp->length * descr->token_size;
 742 
 743                         if (len > IW_ESSID_MAX_SIZE)
 744                                 return -EFAULT;
 745 
 746                         err = copy_from_user(essid, iwp->pointer, len);
 747                         if (err)
 748                                 return -EFAULT;
 749 
 750                         if (essid[iwp->length - 1] == '\0')
 751                                 essid_compat = 1;
 752                 }
 753                 break;
 754         default:
 755                 break;
 756         }
 757 
 758         iwp->length -= essid_compat;
 759 
 760         /* Check what user space is giving us */
 761         if (IW_IS_SET(cmd)) {
 762                 /* Check NULL pointer */
 763                 if (!iwp->pointer && iwp->length != 0)
 764                         return -EFAULT;
 765                 /* Check if number of token fits within bounds */
 766                 if (iwp->length > descr->max_tokens)
 767                         return -E2BIG;
 768                 if (iwp->length < descr->min_tokens)
 769                         return -EINVAL;
 770         } else {
 771                 /* Check NULL pointer */
 772                 if (!iwp->pointer)
 773                         return -EFAULT;
 774                 /* Save user space buffer size for checking */
 775                 user_length = iwp->length;
 776 
 777                 /* Don't check if user_length > max to allow forward
 778                  * compatibility. The test user_length < min is
 779                  * implied by the test at the end.
 780                  */
 781 
 782                 /* Support for very large requests */
 783                 if ((descr->flags & IW_DESCR_FLAG_NOMAX) &&
 784                     (user_length > descr->max_tokens)) {
 785                         /* Allow userspace to GET more than max so
 786                          * we can support any size GET requests.
 787                          * There is still a limit : -ENOMEM.
 788                          */
 789                         extra_size = user_length * descr->token_size;
 790 
 791                         /* Note : user_length is originally a __u16,
 792                          * and token_size is controlled by us,
 793                          * so extra_size won't get negative and
 794                          * won't overflow...
 795                          */
 796                 }
 797         }
 798 
 799         /* kzalloc() ensures NULL-termination for essid_compat. */
 800         extra = kzalloc(extra_size, GFP_KERNEL);
 801         if (!extra)
 802                 return -ENOMEM;
 803 
 804         /* If it is a SET, get all the extra data in here */
 805         if (IW_IS_SET(cmd) && (iwp->length != 0)) {
 806                 if (copy_from_user(extra, iwp->pointer,
 807                                    iwp->length *
 808                                    descr->token_size)) {
 809                         err = -EFAULT;
 810                         goto out;
 811                 }
 812 
 813                 if (cmd == SIOCSIWENCODEEXT) {
 814                         struct iw_encode_ext *ee = (void *) extra;
 815 
 816                         if (iwp->length < sizeof(*ee) + ee->key_len) {
 817                                 err = -EFAULT;
 818                                 goto out;
 819                         }
 820                 }
 821         }
 822 
 823         if (IW_IS_GET(cmd) && !(descr->flags & IW_DESCR_FLAG_NOMAX)) {
 824                 /*
 825                  * If this is a GET, but not NOMAX, it means that the extra
 826                  * data is not bounded by userspace, but by max_tokens. Thus
 827                  * set the length to max_tokens. This matches the extra data
 828                  * allocation.
 829                  * The driver should fill it with the number of tokens it
 830                  * provided, and it may check iwp->length rather than having
 831                  * knowledge of max_tokens. If the driver doesn't change the
 832                  * iwp->length, this ioctl just copies back max_token tokens
 833                  * filled with zeroes. Hopefully the driver isn't claiming
 834                  * them to be valid data.
 835                  */
 836                 iwp->length = descr->max_tokens;
 837         }
 838 
 839         err = handler(dev, info, (union iwreq_data *) iwp, extra);
 840 
 841         iwp->length += essid_compat;
 842 
 843         /* If we have something to return to the user */
 844         if (!err && IW_IS_GET(cmd)) {
 845                 /* Check if there is enough buffer up there */
 846                 if (user_length < iwp->length) {
 847                         err = -E2BIG;
 848                         goto out;
 849                 }
 850 
 851                 if (copy_to_user(iwp->pointer, extra,
 852                                  iwp->length *
 853                                  descr->token_size)) {
 854                         err = -EFAULT;
 855                         goto out;
 856                 }
 857         }
 858 
 859         /* Generate an event to notify listeners of the change */
 860         if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
 861             ((err == 0) || (err == -EIWCOMMIT))) {
 862                 union iwreq_data *data = (union iwreq_data *) iwp;
 863 
 864                 if (descr->flags & IW_DESCR_FLAG_RESTRICT)
 865                         /* If the event is restricted, don't
 866                          * export the payload.
 867                          */
 868                         wireless_send_event(dev, cmd, data, NULL);
 869                 else
 870                         wireless_send_event(dev, cmd, data, extra);
 871         }
 872 
 873 out:
 874         kfree(extra);
 875         return err;
 876 }
 877 
 878 /*
 879  * Call the commit handler in the driver
 880  * (if exist and if conditions are right)
 881  *
 882  * Note : our current commit strategy is currently pretty dumb,
 883  * but we will be able to improve on that...
 884  * The goal is to try to agreagate as many changes as possible
 885  * before doing the commit. Drivers that will define a commit handler
 886  * are usually those that need a reset after changing parameters, so
 887  * we want to minimise the number of reset.
 888  * A cool idea is to use a timer : at each "set" command, we re-set the
 889  * timer, when the timer eventually fires, we call the driver.
 890  * Hopefully, more on that later.
 891  *
 892  * Also, I'm waiting to see how many people will complain about the
 893  * netif_running(dev) test. I'm open on that one...
 894  * Hopefully, the driver will remember to do a commit in "open()" ;-)
 895  */
 896 int call_commit_handler(struct net_device *dev)
 897 {
 898 #ifdef CONFIG_WIRELESS_EXT
 899         if ((netif_running(dev)) &&
 900            (dev->wireless_handlers->standard[0] != NULL))
 901                 /* Call the commit handler on the driver */
 902                 return dev->wireless_handlers->standard[0](dev, NULL,
 903                                                            NULL, NULL);
 904         else
 905                 return 0;               /* Command completed successfully */
 906 #else
 907         /* cfg80211 has no commit */
 908         return 0;
 909 #endif
 910 }
 911 
 912 /*
 913  * Main IOCTl dispatcher.
 914  * Check the type of IOCTL and call the appropriate wrapper...
 915  */
 916 static int wireless_process_ioctl(struct net *net, struct iwreq *iwr,
 917                                   unsigned int cmd,
 918                                   struct iw_request_info *info,
 919                                   wext_ioctl_func standard,
 920                                   wext_ioctl_func private)
 921 {
 922         struct net_device *dev;
 923         iw_handler      handler;
 924 
 925         /* Permissions are already checked in dev_ioctl() before calling us.
 926          * The copy_to/from_user() of ifr is also dealt with in there */
 927 
 928         /* Make sure the device exist */
 929         if ((dev = __dev_get_by_name(net, iwr->ifr_name)) == NULL)
 930                 return -ENODEV;
 931 
 932         /* A bunch of special cases, then the generic case...
 933          * Note that 'cmd' is already filtered in dev_ioctl() with
 934          * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */
 935         if (cmd == SIOCGIWSTATS)
 936                 return standard(dev, iwr, cmd, info,
 937                                 &iw_handler_get_iwstats);
 938 
 939 #ifdef CONFIG_WEXT_PRIV
 940         if (cmd == SIOCGIWPRIV && dev->wireless_handlers)
 941                 return standard(dev, iwr, cmd, info,
 942                                 iw_handler_get_private);
 943 #endif
 944 
 945         /* Basic check */
 946         if (!netif_device_present(dev))
 947                 return -ENODEV;
 948 
 949         /* New driver API : try to find the handler */
 950         handler = get_handler(dev, cmd);
 951         if (handler) {
 952                 /* Standard and private are not the same */
 953                 if (cmd < SIOCIWFIRSTPRIV)
 954                         return standard(dev, iwr, cmd, info, handler);
 955                 else if (private)
 956                         return private(dev, iwr, cmd, info, handler);
 957         }
 958         return -EOPNOTSUPP;
 959 }
 960 
 961 /* If command is `set a parameter', or `get the encoding parameters',
 962  * check if the user has the right to do it.
 963  */
 964 static int wext_permission_check(unsigned int cmd)
 965 {
 966         if ((IW_IS_SET(cmd) || cmd == SIOCGIWENCODE ||
 967              cmd == SIOCGIWENCODEEXT) &&
 968             !capable(CAP_NET_ADMIN))
 969                 return -EPERM;
 970 
 971         return 0;
 972 }
 973 
 974 /* entry point from dev ioctl */
 975 static int wext_ioctl_dispatch(struct net *net, struct iwreq *iwr,
 976                                unsigned int cmd, struct iw_request_info *info,
 977                                wext_ioctl_func standard,
 978                                wext_ioctl_func private)
 979 {
 980         int ret = wext_permission_check(cmd);
 981 
 982         if (ret)
 983                 return ret;
 984 
 985         dev_load(net, iwr->ifr_name);
 986         rtnl_lock();
 987         ret = wireless_process_ioctl(net, iwr, cmd, info, standard, private);
 988         rtnl_unlock();
 989 
 990         return ret;
 991 }
 992 
 993 /*
 994  * Wrapper to call a standard Wireless Extension handler.
 995  * We do various checks and also take care of moving data between
 996  * user space and kernel space.
 997  */
 998 static int ioctl_standard_call(struct net_device *      dev,
 999                                struct iwreq             *iwr,
1000                                unsigned int             cmd,
1001                                struct iw_request_info   *info,
1002                                iw_handler               handler)
1003 {
1004         const struct iw_ioctl_description *     descr;
1005         int                                     ret = -EINVAL;
1006 
1007         /* Get the description of the IOCTL */
1008         if (IW_IOCTL_IDX(cmd) >= standard_ioctl_num)
1009                 return -EOPNOTSUPP;
1010         descr = &(standard_ioctl[IW_IOCTL_IDX(cmd)]);
1011 
1012         /* Check if we have a pointer to user space data or not */
1013         if (descr->header_type != IW_HEADER_TYPE_POINT) {
1014 
1015                 /* No extra arguments. Trivial to handle */
1016                 ret = handler(dev, info, &(iwr->u), NULL);
1017 
1018                 /* Generate an event to notify listeners of the change */
1019                 if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
1020                    ((ret == 0) || (ret == -EIWCOMMIT)))
1021                         wireless_send_event(dev, cmd, &(iwr->u), NULL);
1022         } else {
1023                 ret = ioctl_standard_iw_point(&iwr->u.data, cmd, descr,
1024                                               handler, dev, info);
1025         }
1026 
1027         /* Call commit handler if needed and defined */
1028         if (ret == -EIWCOMMIT)
1029                 ret = call_commit_handler(dev);
1030 
1031         /* Here, we will generate the appropriate event if needed */
1032 
1033         return ret;
1034 }
1035 
1036 
1037 int wext_handle_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1038 {
1039         struct iw_request_info info = { .cmd = cmd, .flags = 0 };
1040         struct iwreq iwr;
1041         int ret;
1042 
1043         if (copy_from_user(&iwr, arg, sizeof(iwr)))
1044                 return -EFAULT;
1045 
1046         iwr.ifr_name[sizeof(iwr.ifr_name) - 1] = 0;
1047 
1048         ret = wext_ioctl_dispatch(net, &iwr, cmd, &info,
1049                                   ioctl_standard_call,
1050                                   ioctl_private_call);
1051         if (ret >= 0 &&
1052             IW_IS_GET(cmd) &&
1053             copy_to_user(arg, &iwr, sizeof(struct iwreq)))
1054                 return -EFAULT;
1055 
1056         return ret;
1057 }
1058 
1059 #ifdef CONFIG_COMPAT
1060 static int compat_standard_call(struct net_device       *dev,
1061                                 struct iwreq            *iwr,
1062                                 unsigned int            cmd,
1063                                 struct iw_request_info  *info,
1064                                 iw_handler              handler)
1065 {
1066         const struct iw_ioctl_description *descr;
1067         struct compat_iw_point *iwp_compat;
1068         struct iw_point iwp;
1069         int err;
1070 
1071         descr = standard_ioctl + IW_IOCTL_IDX(cmd);
1072 
1073         if (descr->header_type != IW_HEADER_TYPE_POINT)
1074                 return ioctl_standard_call(dev, iwr, cmd, info, handler);
1075 
1076         iwp_compat = (struct compat_iw_point *) &iwr->u.data;
1077         iwp.pointer = compat_ptr(iwp_compat->pointer);
1078         iwp.length = iwp_compat->length;
1079         iwp.flags = iwp_compat->flags;
1080 
1081         err = ioctl_standard_iw_point(&iwp, cmd, descr, handler, dev, info);
1082 
1083         iwp_compat->pointer = ptr_to_compat(iwp.pointer);
1084         iwp_compat->length = iwp.length;
1085         iwp_compat->flags = iwp.flags;
1086 
1087         return err;
1088 }
1089 
1090 int compat_wext_handle_ioctl(struct net *net, unsigned int cmd,
1091                              unsigned long arg)
1092 {
1093         void __user *argp = (void __user *)arg;
1094         struct iw_request_info info;
1095         struct iwreq iwr;
1096         char *colon;
1097         int ret;
1098 
1099         if (copy_from_user(&iwr, argp, sizeof(struct iwreq)))
1100                 return -EFAULT;
1101 
1102         iwr.ifr_name[IFNAMSIZ-1] = 0;
1103         colon = strchr(iwr.ifr_name, ':');
1104         if (colon)
1105                 *colon = 0;
1106 
1107         info.cmd = cmd;
1108         info.flags = IW_REQUEST_FLAG_COMPAT;
1109 
1110         ret = wext_ioctl_dispatch(net, &iwr, cmd, &info,
1111                                   compat_standard_call,
1112                                   compat_private_call);
1113 
1114         if (ret >= 0 &&
1115             IW_IS_GET(cmd) &&
1116             copy_to_user(argp, &iwr, sizeof(struct iwreq)))
1117                 return -EFAULT;
1118 
1119         return ret;
1120 }
1121 #endif
1122 
1123 char *iwe_stream_add_event(struct iw_request_info *info, char *stream,
1124                            char *ends, struct iw_event *iwe, int event_len)
1125 {
1126         int lcp_len = iwe_stream_lcp_len(info);
1127 
1128         event_len = iwe_stream_event_len_adjust(info, event_len);
1129 
1130         /* Check if it's possible */
1131         if (likely((stream + event_len) < ends)) {
1132                 iwe->len = event_len;
1133                 /* Beware of alignement issues on 64 bits */
1134                 memcpy(stream, (char *) iwe, IW_EV_LCP_PK_LEN);
1135                 memcpy(stream + lcp_len, &iwe->u,
1136                        event_len - lcp_len);
1137                 stream += event_len;
1138         }
1139 
1140         return stream;
1141 }
1142 EXPORT_SYMBOL(iwe_stream_add_event);
1143 
1144 char *iwe_stream_add_point(struct iw_request_info *info, char *stream,
1145                            char *ends, struct iw_event *iwe, char *extra)
1146 {
1147         int event_len = iwe_stream_point_len(info) + iwe->u.data.length;
1148         int point_len = iwe_stream_point_len(info);
1149         int lcp_len   = iwe_stream_lcp_len(info);
1150 
1151         /* Check if it's possible */
1152         if (likely((stream + event_len) < ends)) {
1153                 iwe->len = event_len;
1154                 memcpy(stream, (char *) iwe, IW_EV_LCP_PK_LEN);
1155                 memcpy(stream + lcp_len,
1156                        ((char *) &iwe->u) + IW_EV_POINT_OFF,
1157                        IW_EV_POINT_PK_LEN - IW_EV_LCP_PK_LEN);
1158                 if (iwe->u.data.length && extra)
1159                         memcpy(stream + point_len, extra, iwe->u.data.length);
1160                 stream += event_len;
1161         }
1162 
1163         return stream;
1164 }
1165 EXPORT_SYMBOL(iwe_stream_add_point);
1166 
1167 char *iwe_stream_add_value(struct iw_request_info *info, char *event,
1168                            char *value, char *ends, struct iw_event *iwe,
1169                            int event_len)
1170 {
1171         int lcp_len = iwe_stream_lcp_len(info);
1172 
1173         /* Don't duplicate LCP */
1174         event_len -= IW_EV_LCP_LEN;
1175 
1176         /* Check if it's possible */
1177         if (likely((value + event_len) < ends)) {
1178                 /* Add new value */
1179                 memcpy(value, &iwe->u, event_len);
1180                 value += event_len;
1181                 /* Patch LCP */
1182                 iwe->len = value - event;
1183                 memcpy(event, (char *) iwe, lcp_len);
1184         }
1185 
1186         return value;
1187 }
1188 EXPORT_SYMBOL(iwe_stream_add_value);
/* [<][>][^][v][top][bottom][index][help] */
root/net/wireless/wext-core.c

DEFINITIONS
