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0001 /*
0002  * This file implement the Wireless Extensions core API.
0003  *
0004  * Authors :    Jean Tourrilhes - HPL - <jt@hpl.hp.com>
0005  * Copyright (c) 1997-2007 Jean Tourrilhes, All Rights Reserved.
0006  * Copyright    2009 Johannes Berg <johannes@sipsolutions.net>
0007  *
0008  * (As all part of the Linux kernel, this file is GPL)
0009  */
0010 #include <linux/kernel.h>
0011 #include <linux/netdevice.h>
0012 #include <linux/rtnetlink.h>
0013 #include <linux/slab.h>
0014 #include <linux/wireless.h>
0015 #include <linux/uaccess.h>
0016 #include <linux/export.h>
0017 #include <net/cfg80211.h>
0018 #include <net/iw_handler.h>
0019 #include <net/netlink.h>
0020 #include <net/wext.h>
0021 #include <net/net_namespace.h>
0022 
0023 typedef int (*wext_ioctl_func)(struct net_device *, struct iwreq *,
0024                    unsigned int, struct iw_request_info *,
0025                    iw_handler);
0026 
0027 
0028 /*
0029  * Meta-data about all the standard Wireless Extension request we
0030  * know about.
0031  */
0032 static const struct iw_ioctl_description standard_ioctl[] = {
0033     [IW_IOCTL_IDX(SIOCSIWCOMMIT)] = {
0034         .header_type    = IW_HEADER_TYPE_NULL,
0035     },
0036     [IW_IOCTL_IDX(SIOCGIWNAME)] = {
0037         .header_type    = IW_HEADER_TYPE_CHAR,
0038         .flags      = IW_DESCR_FLAG_DUMP,
0039     },
0040     [IW_IOCTL_IDX(SIOCSIWNWID)] = {
0041         .header_type    = IW_HEADER_TYPE_PARAM,
0042         .flags      = IW_DESCR_FLAG_EVENT,
0043     },
0044     [IW_IOCTL_IDX(SIOCGIWNWID)] = {
0045         .header_type    = IW_HEADER_TYPE_PARAM,
0046         .flags      = IW_DESCR_FLAG_DUMP,
0047     },
0048     [IW_IOCTL_IDX(SIOCSIWFREQ)] = {
0049         .header_type    = IW_HEADER_TYPE_FREQ,
0050         .flags      = IW_DESCR_FLAG_EVENT,
0051     },
0052     [IW_IOCTL_IDX(SIOCGIWFREQ)] = {
0053         .header_type    = IW_HEADER_TYPE_FREQ,
0054         .flags      = IW_DESCR_FLAG_DUMP,
0055     },
0056     [IW_IOCTL_IDX(SIOCSIWMODE)] = {
0057         .header_type    = IW_HEADER_TYPE_UINT,
0058         .flags      = IW_DESCR_FLAG_EVENT,
0059     },
0060     [IW_IOCTL_IDX(SIOCGIWMODE)] = {
0061         .header_type    = IW_HEADER_TYPE_UINT,
0062         .flags      = IW_DESCR_FLAG_DUMP,
0063     },
0064     [IW_IOCTL_IDX(SIOCSIWSENS)] = {
0065         .header_type    = IW_HEADER_TYPE_PARAM,
0066     },
0067     [IW_IOCTL_IDX(SIOCGIWSENS)] = {
0068         .header_type    = IW_HEADER_TYPE_PARAM,
0069     },
0070     [IW_IOCTL_IDX(SIOCSIWRANGE)] = {
0071         .header_type    = IW_HEADER_TYPE_NULL,
0072     },
0073     [IW_IOCTL_IDX(SIOCGIWRANGE)] = {
0074         .header_type    = IW_HEADER_TYPE_POINT,
0075         .token_size = 1,
0076         .max_tokens = sizeof(struct iw_range),
0077         .flags      = IW_DESCR_FLAG_DUMP,
0078     },
0079     [IW_IOCTL_IDX(SIOCSIWPRIV)] = {
0080         .header_type    = IW_HEADER_TYPE_NULL,
0081     },
0082     [IW_IOCTL_IDX(SIOCGIWPRIV)] = { /* (handled directly by us) */
0083         .header_type    = IW_HEADER_TYPE_POINT,
0084         .token_size = sizeof(struct iw_priv_args),
0085         .max_tokens = 16,
0086         .flags      = IW_DESCR_FLAG_NOMAX,
0087     },
0088     [IW_IOCTL_IDX(SIOCSIWSTATS)] = {
0089         .header_type    = IW_HEADER_TYPE_NULL,
0090     },
0091     [IW_IOCTL_IDX(SIOCGIWSTATS)] = { /* (handled directly by us) */
0092         .header_type    = IW_HEADER_TYPE_POINT,
0093         .token_size = 1,
0094         .max_tokens = sizeof(struct iw_statistics),
0095         .flags      = IW_DESCR_FLAG_DUMP,
0096     },
0097     [IW_IOCTL_IDX(SIOCSIWSPY)] = {
0098         .header_type    = IW_HEADER_TYPE_POINT,
0099         .token_size = sizeof(struct sockaddr),
0100         .max_tokens = IW_MAX_SPY,
0101     },
0102     [IW_IOCTL_IDX(SIOCGIWSPY)] = {
0103         .header_type    = IW_HEADER_TYPE_POINT,
0104         .token_size = sizeof(struct sockaddr) +
0105                   sizeof(struct iw_quality),
0106         .max_tokens = IW_MAX_SPY,
0107     },
0108     [IW_IOCTL_IDX(SIOCSIWTHRSPY)] = {
0109         .header_type    = IW_HEADER_TYPE_POINT,
0110         .token_size = sizeof(struct iw_thrspy),
0111         .min_tokens = 1,
0112         .max_tokens = 1,
0113     },
0114     [IW_IOCTL_IDX(SIOCGIWTHRSPY)] = {
0115         .header_type    = IW_HEADER_TYPE_POINT,
0116         .token_size = sizeof(struct iw_thrspy),
0117         .min_tokens = 1,
0118         .max_tokens = 1,
0119     },
0120     [IW_IOCTL_IDX(SIOCSIWAP)] = {
0121         .header_type    = IW_HEADER_TYPE_ADDR,
0122     },
0123     [IW_IOCTL_IDX(SIOCGIWAP)] = {
0124         .header_type    = IW_HEADER_TYPE_ADDR,
0125         .flags      = IW_DESCR_FLAG_DUMP,
0126     },
0127     [IW_IOCTL_IDX(SIOCSIWMLME)] = {
0128         .header_type    = IW_HEADER_TYPE_POINT,
0129         .token_size = 1,
0130         .min_tokens = sizeof(struct iw_mlme),
0131         .max_tokens = sizeof(struct iw_mlme),
0132     },
0133     [IW_IOCTL_IDX(SIOCGIWAPLIST)] = {
0134         .header_type    = IW_HEADER_TYPE_POINT,
0135         .token_size = sizeof(struct sockaddr) +
0136                   sizeof(struct iw_quality),
0137         .max_tokens = IW_MAX_AP,
0138         .flags      = IW_DESCR_FLAG_NOMAX,
0139     },
0140     [IW_IOCTL_IDX(SIOCSIWSCAN)] = {
0141         .header_type    = IW_HEADER_TYPE_POINT,
0142         .token_size = 1,
0143         .min_tokens = 0,
0144         .max_tokens = sizeof(struct iw_scan_req),
0145     },
0146     [IW_IOCTL_IDX(SIOCGIWSCAN)] = {
0147         .header_type    = IW_HEADER_TYPE_POINT,
0148         .token_size = 1,
0149         .max_tokens = IW_SCAN_MAX_DATA,
0150         .flags      = IW_DESCR_FLAG_NOMAX,
0151     },
0152     [IW_IOCTL_IDX(SIOCSIWESSID)] = {
0153         .header_type    = IW_HEADER_TYPE_POINT,
0154         .token_size = 1,
0155         .max_tokens = IW_ESSID_MAX_SIZE,
0156         .flags      = IW_DESCR_FLAG_EVENT,
0157     },
0158     [IW_IOCTL_IDX(SIOCGIWESSID)] = {
0159         .header_type    = IW_HEADER_TYPE_POINT,
0160         .token_size = 1,
0161         .max_tokens = IW_ESSID_MAX_SIZE,
0162         .flags      = IW_DESCR_FLAG_DUMP,
0163     },
0164     [IW_IOCTL_IDX(SIOCSIWNICKN)] = {
0165         .header_type    = IW_HEADER_TYPE_POINT,
0166         .token_size = 1,
0167         .max_tokens = IW_ESSID_MAX_SIZE,
0168     },
0169     [IW_IOCTL_IDX(SIOCGIWNICKN)] = {
0170         .header_type    = IW_HEADER_TYPE_POINT,
0171         .token_size = 1,
0172         .max_tokens = IW_ESSID_MAX_SIZE,
0173     },
0174     [IW_IOCTL_IDX(SIOCSIWRATE)] = {
0175         .header_type    = IW_HEADER_TYPE_PARAM,
0176     },
0177     [IW_IOCTL_IDX(SIOCGIWRATE)] = {
0178         .header_type    = IW_HEADER_TYPE_PARAM,
0179     },
0180     [IW_IOCTL_IDX(SIOCSIWRTS)] = {
0181         .header_type    = IW_HEADER_TYPE_PARAM,
0182     },
0183     [IW_IOCTL_IDX(SIOCGIWRTS)] = {
0184         .header_type    = IW_HEADER_TYPE_PARAM,
0185     },
0186     [IW_IOCTL_IDX(SIOCSIWFRAG)] = {
0187         .header_type    = IW_HEADER_TYPE_PARAM,
0188     },
0189     [IW_IOCTL_IDX(SIOCGIWFRAG)] = {
0190         .header_type    = IW_HEADER_TYPE_PARAM,
0191     },
0192     [IW_IOCTL_IDX(SIOCSIWTXPOW)] = {
0193         .header_type    = IW_HEADER_TYPE_PARAM,
0194     },
0195     [IW_IOCTL_IDX(SIOCGIWTXPOW)] = {
0196         .header_type    = IW_HEADER_TYPE_PARAM,
0197     },
0198     [IW_IOCTL_IDX(SIOCSIWRETRY)] = {
0199         .header_type    = IW_HEADER_TYPE_PARAM,
0200     },
0201     [IW_IOCTL_IDX(SIOCGIWRETRY)] = {
0202         .header_type    = IW_HEADER_TYPE_PARAM,
0203     },
0204     [IW_IOCTL_IDX(SIOCSIWENCODE)] = {
0205         .header_type    = IW_HEADER_TYPE_POINT,
0206         .token_size = 1,
0207         .max_tokens = IW_ENCODING_TOKEN_MAX,
0208         .flags      = IW_DESCR_FLAG_EVENT | IW_DESCR_FLAG_RESTRICT,
0209     },
0210     [IW_IOCTL_IDX(SIOCGIWENCODE)] = {
0211         .header_type    = IW_HEADER_TYPE_POINT,
0212         .token_size = 1,
0213         .max_tokens = IW_ENCODING_TOKEN_MAX,
0214         .flags      = IW_DESCR_FLAG_DUMP | IW_DESCR_FLAG_RESTRICT,
0215     },
0216     [IW_IOCTL_IDX(SIOCSIWPOWER)] = {
0217         .header_type    = IW_HEADER_TYPE_PARAM,
0218     },
0219     [IW_IOCTL_IDX(SIOCGIWPOWER)] = {
0220         .header_type    = IW_HEADER_TYPE_PARAM,
0221     },
0222     [IW_IOCTL_IDX(SIOCSIWGENIE)] = {
0223         .header_type    = IW_HEADER_TYPE_POINT,
0224         .token_size = 1,
0225         .max_tokens = IW_GENERIC_IE_MAX,
0226     },
0227     [IW_IOCTL_IDX(SIOCGIWGENIE)] = {
0228         .header_type    = IW_HEADER_TYPE_POINT,
0229         .token_size = 1,
0230         .max_tokens = IW_GENERIC_IE_MAX,
0231     },
0232     [IW_IOCTL_IDX(SIOCSIWAUTH)] = {
0233         .header_type    = IW_HEADER_TYPE_PARAM,
0234     },
0235     [IW_IOCTL_IDX(SIOCGIWAUTH)] = {
0236         .header_type    = IW_HEADER_TYPE_PARAM,
0237     },
0238     [IW_IOCTL_IDX(SIOCSIWENCODEEXT)] = {
0239         .header_type    = IW_HEADER_TYPE_POINT,
0240         .token_size = 1,
0241         .min_tokens = sizeof(struct iw_encode_ext),
0242         .max_tokens = sizeof(struct iw_encode_ext) +
0243                   IW_ENCODING_TOKEN_MAX,
0244     },
0245     [IW_IOCTL_IDX(SIOCGIWENCODEEXT)] = {
0246         .header_type    = IW_HEADER_TYPE_POINT,
0247         .token_size = 1,
0248         .min_tokens = sizeof(struct iw_encode_ext),
0249         .max_tokens = sizeof(struct iw_encode_ext) +
0250                   IW_ENCODING_TOKEN_MAX,
0251     },
0252     [IW_IOCTL_IDX(SIOCSIWPMKSA)] = {
0253         .header_type    = IW_HEADER_TYPE_POINT,
0254         .token_size = 1,
0255         .min_tokens = sizeof(struct iw_pmksa),
0256         .max_tokens = sizeof(struct iw_pmksa),
0257     },
0258 };
0259 static const unsigned int standard_ioctl_num = ARRAY_SIZE(standard_ioctl);
0260 
0261 /*
0262  * Meta-data about all the additional standard Wireless Extension events
0263  * we know about.
0264  */
0265 static const struct iw_ioctl_description standard_event[] = {
0266     [IW_EVENT_IDX(IWEVTXDROP)] = {
0267         .header_type    = IW_HEADER_TYPE_ADDR,
0268     },
0269     [IW_EVENT_IDX(IWEVQUAL)] = {
0270         .header_type    = IW_HEADER_TYPE_QUAL,
0271     },
0272     [IW_EVENT_IDX(IWEVCUSTOM)] = {
0273         .header_type    = IW_HEADER_TYPE_POINT,
0274         .token_size = 1,
0275         .max_tokens = IW_CUSTOM_MAX,
0276     },
0277     [IW_EVENT_IDX(IWEVREGISTERED)] = {
0278         .header_type    = IW_HEADER_TYPE_ADDR,
0279     },
0280     [IW_EVENT_IDX(IWEVEXPIRED)] = {
0281         .header_type    = IW_HEADER_TYPE_ADDR,
0282     },
0283     [IW_EVENT_IDX(IWEVGENIE)] = {
0284         .header_type    = IW_HEADER_TYPE_POINT,
0285         .token_size = 1,
0286         .max_tokens = IW_GENERIC_IE_MAX,
0287     },
0288     [IW_EVENT_IDX(IWEVMICHAELMICFAILURE)] = {
0289         .header_type    = IW_HEADER_TYPE_POINT,
0290         .token_size = 1,
0291         .max_tokens = sizeof(struct iw_michaelmicfailure),
0292     },
0293     [IW_EVENT_IDX(IWEVASSOCREQIE)] = {
0294         .header_type    = IW_HEADER_TYPE_POINT,
0295         .token_size = 1,
0296         .max_tokens = IW_GENERIC_IE_MAX,
0297     },
0298     [IW_EVENT_IDX(IWEVASSOCRESPIE)] = {
0299         .header_type    = IW_HEADER_TYPE_POINT,
0300         .token_size = 1,
0301         .max_tokens = IW_GENERIC_IE_MAX,
0302     },
0303     [IW_EVENT_IDX(IWEVPMKIDCAND)] = {
0304         .header_type    = IW_HEADER_TYPE_POINT,
0305         .token_size = 1,
0306         .max_tokens = sizeof(struct iw_pmkid_cand),
0307     },
0308 };
0309 static const unsigned int standard_event_num = ARRAY_SIZE(standard_event);
0310 
0311 /* Size (in bytes) of various events */
0312 static const int event_type_size[] = {
0313     IW_EV_LCP_LEN,          /* IW_HEADER_TYPE_NULL */
0314     0,
0315     IW_EV_CHAR_LEN,         /* IW_HEADER_TYPE_CHAR */
0316     0,
0317     IW_EV_UINT_LEN,         /* IW_HEADER_TYPE_UINT */
0318     IW_EV_FREQ_LEN,         /* IW_HEADER_TYPE_FREQ */
0319     IW_EV_ADDR_LEN,         /* IW_HEADER_TYPE_ADDR */
0320     0,
0321     IW_EV_POINT_LEN,        /* Without variable payload */
0322     IW_EV_PARAM_LEN,        /* IW_HEADER_TYPE_PARAM */
0323     IW_EV_QUAL_LEN,         /* IW_HEADER_TYPE_QUAL */
0324 };
0325 
0326 #ifdef CONFIG_COMPAT
0327 static const int compat_event_type_size[] = {
0328     IW_EV_COMPAT_LCP_LEN,       /* IW_HEADER_TYPE_NULL */
0329     0,
0330     IW_EV_COMPAT_CHAR_LEN,      /* IW_HEADER_TYPE_CHAR */
0331     0,
0332     IW_EV_COMPAT_UINT_LEN,      /* IW_HEADER_TYPE_UINT */
0333     IW_EV_COMPAT_FREQ_LEN,      /* IW_HEADER_TYPE_FREQ */
0334     IW_EV_COMPAT_ADDR_LEN,      /* IW_HEADER_TYPE_ADDR */
0335     0,
0336     IW_EV_COMPAT_POINT_LEN,     /* Without variable payload */
0337     IW_EV_COMPAT_PARAM_LEN,     /* IW_HEADER_TYPE_PARAM */
0338     IW_EV_COMPAT_QUAL_LEN,      /* IW_HEADER_TYPE_QUAL */
0339 };
0340 #endif
0341 
0342 
0343 /* IW event code */
0344 
0345 void wireless_nlevent_flush(void)
0346 {
0347     struct sk_buff *skb;
0348     struct net *net;
0349 
0350     down_read(&net_rwsem);
0351     for_each_net(net) {
0352         while ((skb = skb_dequeue(&net->wext_nlevents)))
0353             rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL,
0354                     GFP_KERNEL);
0355     }
0356     up_read(&net_rwsem);
0357 }
0358 EXPORT_SYMBOL_GPL(wireless_nlevent_flush);
0359 
0360 static int wext_netdev_notifier_call(struct notifier_block *nb,
0361                      unsigned long state, void *ptr)
0362 {
0363     /*
0364      * When a netdev changes state in any way, flush all pending messages
0365      * to avoid them going out in a strange order, e.g. RTM_NEWLINK after
0366      * RTM_DELLINK, or with IFF_UP after without IFF_UP during dev_close()
0367      * or similar - all of which could otherwise happen due to delays from
0368      * schedule_work().
0369      */
0370     wireless_nlevent_flush();
0371 
0372     return NOTIFY_OK;
0373 }
0374 
0375 static struct notifier_block wext_netdev_notifier = {
0376     .notifier_call = wext_netdev_notifier_call,
0377 };
0378 
0379 static int __net_init wext_pernet_init(struct net *net)
0380 {
0381     skb_queue_head_init(&net->wext_nlevents);
0382     return 0;
0383 }
0384 
0385 static void __net_exit wext_pernet_exit(struct net *net)
0386 {
0387     skb_queue_purge(&net->wext_nlevents);
0388 }
0389 
0390 static struct pernet_operations wext_pernet_ops = {
0391     .init = wext_pernet_init,
0392     .exit = wext_pernet_exit,
0393 };
0394 
0395 static int __init wireless_nlevent_init(void)
0396 {
0397     int err = register_pernet_subsys(&wext_pernet_ops);
0398 
0399     if (err)
0400         return err;
0401 
0402     err = register_netdevice_notifier(&wext_netdev_notifier);
0403     if (err)
0404         unregister_pernet_subsys(&wext_pernet_ops);
0405     return err;
0406 }
0407 
0408 subsys_initcall(wireless_nlevent_init);
0409 
0410 /* Process events generated by the wireless layer or the driver. */
0411 static void wireless_nlevent_process(struct work_struct *work)
0412 {
0413     wireless_nlevent_flush();
0414 }
0415 
0416 static DECLARE_WORK(wireless_nlevent_work, wireless_nlevent_process);
0417 
0418 static struct nlmsghdr *rtnetlink_ifinfo_prep(struct net_device *dev,
0419                           struct sk_buff *skb)
0420 {
0421     struct ifinfomsg *r;
0422     struct nlmsghdr  *nlh;
0423 
0424     nlh = nlmsg_put(skb, 0, 0, RTM_NEWLINK, sizeof(*r), 0);
0425     if (!nlh)
0426         return NULL;
0427 
0428     r = nlmsg_data(nlh);
0429     r->ifi_family = AF_UNSPEC;
0430     r->__ifi_pad = 0;
0431     r->ifi_type = dev->type;
0432     r->ifi_index = dev->ifindex;
0433     r->ifi_flags = dev_get_flags(dev);
0434     r->ifi_change = 0;  /* Wireless changes don't affect those flags */
0435 
0436     if (nla_put_string(skb, IFLA_IFNAME, dev->name))
0437         goto nla_put_failure;
0438 
0439     return nlh;
0440  nla_put_failure:
0441     nlmsg_cancel(skb, nlh);
0442     return NULL;
0443 }
0444 
0445 
0446 /*
0447  * Main event dispatcher. Called from other parts and drivers.
0448  * Send the event on the appropriate channels.
0449  * May be called from interrupt context.
0450  */
0451 void wireless_send_event(struct net_device *    dev,
0452              unsigned int       cmd,
0453              union iwreq_data * wrqu,
0454              const char *       extra)
0455 {
0456     const struct iw_ioctl_description * descr = NULL;
0457     int extra_len = 0;
0458     struct iw_event  *event;        /* Mallocated whole event */
0459     int event_len;              /* Its size */
0460     int hdr_len;                /* Size of the event header */
0461     int wrqu_off = 0;           /* Offset in wrqu */
0462     /* Don't "optimise" the following variable, it will crash */
0463     unsigned int    cmd_index;      /* *MUST* be unsigned */
0464     struct sk_buff *skb;
0465     struct nlmsghdr *nlh;
0466     struct nlattr *nla;
0467 #ifdef CONFIG_COMPAT
0468     struct __compat_iw_event *compat_event;
0469     struct compat_iw_point compat_wrqu;
0470     struct sk_buff *compskb;
0471 #endif
0472 
0473     /*
0474      * Nothing in the kernel sends scan events with data, be safe.
0475      * This is necessary because we cannot fix up scan event data
0476      * for compat, due to being contained in 'extra', but normally
0477      * applications are required to retrieve the scan data anyway
0478      * and no data is included in the event, this codifies that
0479      * practice.
0480      */
0481     if (WARN_ON(cmd == SIOCGIWSCAN && extra))
0482         extra = NULL;
0483 
0484     /* Get the description of the Event */
0485     if (cmd <= SIOCIWLAST) {
0486         cmd_index = IW_IOCTL_IDX(cmd);
0487         if (cmd_index < standard_ioctl_num)
0488             descr = &(standard_ioctl[cmd_index]);
0489     } else {
0490         cmd_index = IW_EVENT_IDX(cmd);
0491         if (cmd_index < standard_event_num)
0492             descr = &(standard_event[cmd_index]);
0493     }
0494     /* Don't accept unknown events */
0495     if (descr == NULL) {
0496         /* Note : we don't return an error to the driver, because
0497          * the driver would not know what to do about it. It can't
0498          * return an error to the user, because the event is not
0499          * initiated by a user request.
0500          * The best the driver could do is to log an error message.
0501          * We will do it ourselves instead...
0502          */
0503         netdev_err(dev, "(WE) : Invalid/Unknown Wireless Event (0x%04X)\n",
0504                cmd);
0505         return;
0506     }
0507 
0508     /* Check extra parameters and set extra_len */
0509     if (descr->header_type == IW_HEADER_TYPE_POINT) {
0510         /* Check if number of token fits within bounds */
0511         if (wrqu->data.length > descr->max_tokens) {
0512             netdev_err(dev, "(WE) : Wireless Event (cmd=0x%04X) too big (%d)\n",
0513                    cmd, wrqu->data.length);
0514             return;
0515         }
0516         if (wrqu->data.length < descr->min_tokens) {
0517             netdev_err(dev, "(WE) : Wireless Event (cmd=0x%04X) too small (%d)\n",
0518                    cmd, wrqu->data.length);
0519             return;
0520         }
0521         /* Calculate extra_len - extra is NULL for restricted events */
0522         if (extra != NULL)
0523             extra_len = wrqu->data.length * descr->token_size;
0524         /* Always at an offset in wrqu */
0525         wrqu_off = IW_EV_POINT_OFF;
0526     }
0527 
0528     /* Total length of the event */
0529     hdr_len = event_type_size[descr->header_type];
0530     event_len = hdr_len + extra_len;
0531 
0532     /*
0533      * The problem for 64/32 bit.
0534      *
0535      * On 64-bit, a regular event is laid out as follows:
0536      *      |  0  |  1  |  2  |  3  |  4  |  5  |  6  |  7  |
0537      *      | event.len | event.cmd |     p a d d i n g     |
0538      *      | wrqu data ... (with the correct size)         |
0539      *
0540      * This padding exists because we manipulate event->u,
0541      * and 'event' is not packed.
0542      *
0543      * An iw_point event is laid out like this instead:
0544      *      |  0  |  1  |  2  |  3  |  4  |  5  |  6  |  7  |
0545      *      | event.len | event.cmd |     p a d d i n g     |
0546      *      | iwpnt.len | iwpnt.flg |     p a d d i n g     |
0547      *      | extra data  ...
0548      *
0549      * The second padding exists because struct iw_point is extended,
0550      * but this depends on the platform...
0551      *
0552      * On 32-bit, all the padding shouldn't be there.
0553      */
0554 
0555     skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
0556     if (!skb)
0557         return;
0558 
0559     /* Send via the RtNetlink event channel */
0560     nlh = rtnetlink_ifinfo_prep(dev, skb);
0561     if (WARN_ON(!nlh)) {
0562         kfree_skb(skb);
0563         return;
0564     }
0565 
0566     /* Add the wireless events in the netlink packet */
0567     nla = nla_reserve(skb, IFLA_WIRELESS, event_len);
0568     if (!nla) {
0569         kfree_skb(skb);
0570         return;
0571     }
0572     event = nla_data(nla);
0573 
0574     /* Fill event - first clear to avoid data leaking */
0575     memset(event, 0, hdr_len);
0576     event->len = event_len;
0577     event->cmd = cmd;
0578     memcpy(&event->u, ((char *) wrqu) + wrqu_off, hdr_len - IW_EV_LCP_LEN);
0579     if (extra_len)
0580         memcpy(((char *) event) + hdr_len, extra, extra_len);
0581 
0582     nlmsg_end(skb, nlh);
0583 #ifdef CONFIG_COMPAT
0584     hdr_len = compat_event_type_size[descr->header_type];
0585     event_len = hdr_len + extra_len;
0586 
0587     compskb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
0588     if (!compskb) {
0589         kfree_skb(skb);
0590         return;
0591     }
0592 
0593     /* Send via the RtNetlink event channel */
0594     nlh = rtnetlink_ifinfo_prep(dev, compskb);
0595     if (WARN_ON(!nlh)) {
0596         kfree_skb(skb);
0597         kfree_skb(compskb);
0598         return;
0599     }
0600 
0601     /* Add the wireless events in the netlink packet */
0602     nla = nla_reserve(compskb, IFLA_WIRELESS, event_len);
0603     if (!nla) {
0604         kfree_skb(skb);
0605         kfree_skb(compskb);
0606         return;
0607     }
0608     compat_event = nla_data(nla);
0609 
0610     compat_event->len = event_len;
0611     compat_event->cmd = cmd;
0612     if (descr->header_type == IW_HEADER_TYPE_POINT) {
0613         compat_wrqu.length = wrqu->data.length;
0614         compat_wrqu.flags = wrqu->data.flags;
0615         memcpy(&compat_event->pointer,
0616             ((char *) &compat_wrqu) + IW_EV_COMPAT_POINT_OFF,
0617             hdr_len - IW_EV_COMPAT_LCP_LEN);
0618         if (extra_len)
0619             memcpy(((char *) compat_event) + hdr_len,
0620                 extra, extra_len);
0621     } else {
0622         /* extra_len must be zero, so no if (extra) needed */
0623         memcpy(&compat_event->pointer, wrqu,
0624             hdr_len - IW_EV_COMPAT_LCP_LEN);
0625     }
0626 
0627     nlmsg_end(compskb, nlh);
0628 
0629     skb_shinfo(skb)->frag_list = compskb;
0630 #endif
0631     skb_queue_tail(&dev_net(dev)->wext_nlevents, skb);
0632     schedule_work(&wireless_nlevent_work);
0633 }
0634 EXPORT_SYMBOL(wireless_send_event);
0635 
0636 
0637 
0638 /* IW handlers */
0639 
0640 struct iw_statistics *get_wireless_stats(struct net_device *dev)
0641 {
0642 #ifdef CONFIG_WIRELESS_EXT
0643     if ((dev->wireless_handlers != NULL) &&
0644        (dev->wireless_handlers->get_wireless_stats != NULL))
0645         return dev->wireless_handlers->get_wireless_stats(dev);
0646 #endif
0647 
0648 #ifdef CONFIG_CFG80211_WEXT
0649     if (dev->ieee80211_ptr &&
0650         dev->ieee80211_ptr->wiphy &&
0651         dev->ieee80211_ptr->wiphy->wext &&
0652         dev->ieee80211_ptr->wiphy->wext->get_wireless_stats)
0653         return dev->ieee80211_ptr->wiphy->wext->get_wireless_stats(dev);
0654 #endif
0655 
0656     /* not found */
0657     return NULL;
0658 }
0659 
0660 /* noinline to avoid a bogus warning with -O3 */
0661 static noinline int iw_handler_get_iwstats(struct net_device *  dev,
0662                   struct iw_request_info *  info,
0663                   union iwreq_data *        wrqu,
0664                   char *            extra)
0665 {
0666     /* Get stats from the driver */
0667     struct iw_statistics *stats;
0668 
0669     stats = get_wireless_stats(dev);
0670     if (stats) {
0671         /* Copy statistics to extra */
0672         memcpy(extra, stats, sizeof(struct iw_statistics));
0673         wrqu->data.length = sizeof(struct iw_statistics);
0674 
0675         /* Check if we need to clear the updated flag */
0676         if (wrqu->data.flags != 0)
0677             stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
0678         return 0;
0679     } else
0680         return -EOPNOTSUPP;
0681 }
0682 
0683 static iw_handler get_handler(struct net_device *dev, unsigned int cmd)
0684 {
0685     /* Don't "optimise" the following variable, it will crash */
0686     unsigned int    index;      /* *MUST* be unsigned */
0687     const struct iw_handler_def *handlers = NULL;
0688 
0689 #ifdef CONFIG_CFG80211_WEXT
0690     if (dev->ieee80211_ptr && dev->ieee80211_ptr->wiphy)
0691         handlers = dev->ieee80211_ptr->wiphy->wext;
0692 #endif
0693 #ifdef CONFIG_WIRELESS_EXT
0694     if (dev->wireless_handlers)
0695         handlers = dev->wireless_handlers;
0696 #endif
0697 
0698     if (!handlers)
0699         return NULL;
0700 
0701     /* Try as a standard command */
0702     index = IW_IOCTL_IDX(cmd);
0703     if (index < handlers->num_standard)
0704         return handlers->standard[index];
0705 
0706 #ifdef CONFIG_WEXT_PRIV
0707     /* Try as a private command */
0708     index = cmd - SIOCIWFIRSTPRIV;
0709     if (index < handlers->num_private)
0710         return handlers->private[index];
0711 #endif
0712 
0713     /* Not found */
0714     return NULL;
0715 }
0716 
0717 static int ioctl_standard_iw_point(struct iw_point *iwp, unsigned int cmd,
0718                    const struct iw_ioctl_description *descr,
0719                    iw_handler handler, struct net_device *dev,
0720                    struct iw_request_info *info)
0721 {
0722     int err, extra_size, user_length = 0, essid_compat = 0;
0723     char *extra;
0724 
0725     /* Calculate space needed by arguments. Always allocate
0726      * for max space.
0727      */
0728     extra_size = descr->max_tokens * descr->token_size;
0729 
0730     /* Check need for ESSID compatibility for WE < 21 */
0731     switch (cmd) {
0732     case SIOCSIWESSID:
0733     case SIOCGIWESSID:
0734     case SIOCSIWNICKN:
0735     case SIOCGIWNICKN:
0736         if (iwp->length == descr->max_tokens + 1)
0737             essid_compat = 1;
0738         else if (IW_IS_SET(cmd) && (iwp->length != 0)) {
0739             char essid[IW_ESSID_MAX_SIZE + 1];
0740             unsigned int len;
0741             len = iwp->length * descr->token_size;
0742 
0743             if (len > IW_ESSID_MAX_SIZE)
0744                 return -EFAULT;
0745 
0746             err = copy_from_user(essid, iwp->pointer, len);
0747             if (err)
0748                 return -EFAULT;
0749 
0750             if (essid[iwp->length - 1] == '\0')
0751                 essid_compat = 1;
0752         }
0753         break;
0754     default:
0755         break;
0756     }
0757 
0758     iwp->length -= essid_compat;
0759 
0760     /* Check what user space is giving us */
0761     if (IW_IS_SET(cmd)) {
0762         /* Check NULL pointer */
0763         if (!iwp->pointer && iwp->length != 0)
0764             return -EFAULT;
0765         /* Check if number of token fits within bounds */
0766         if (iwp->length > descr->max_tokens)
0767             return -E2BIG;
0768         if (iwp->length < descr->min_tokens)
0769             return -EINVAL;
0770     } else {
0771         /* Check NULL pointer */
0772         if (!iwp->pointer)
0773             return -EFAULT;
0774         /* Save user space buffer size for checking */
0775         user_length = iwp->length;
0776 
0777         /* Don't check if user_length > max to allow forward
0778          * compatibility. The test user_length < min is
0779          * implied by the test at the end.
0780          */
0781 
0782         /* Support for very large requests */
0783         if ((descr->flags & IW_DESCR_FLAG_NOMAX) &&
0784             (user_length > descr->max_tokens)) {
0785             /* Allow userspace to GET more than max so
0786              * we can support any size GET requests.
0787              * There is still a limit : -ENOMEM.
0788              */
0789             extra_size = user_length * descr->token_size;
0790 
0791             /* Note : user_length is originally a __u16,
0792              * and token_size is controlled by us,
0793              * so extra_size won't get negative and
0794              * won't overflow...
0795              */
0796         }
0797     }
0798 
0799     /* kzalloc() ensures NULL-termination for essid_compat. */
0800     extra = kzalloc(extra_size, GFP_KERNEL);
0801     if (!extra)
0802         return -ENOMEM;
0803 
0804     /* If it is a SET, get all the extra data in here */
0805     if (IW_IS_SET(cmd) && (iwp->length != 0)) {
0806         if (copy_from_user(extra, iwp->pointer,
0807                    iwp->length *
0808                    descr->token_size)) {
0809             err = -EFAULT;
0810             goto out;
0811         }
0812 
0813         if (cmd == SIOCSIWENCODEEXT) {
0814             struct iw_encode_ext *ee = (void *) extra;
0815 
0816             if (iwp->length < sizeof(*ee) + ee->key_len) {
0817                 err = -EFAULT;
0818                 goto out;
0819             }
0820         }
0821     }
0822 
0823     if (IW_IS_GET(cmd) && !(descr->flags & IW_DESCR_FLAG_NOMAX)) {
0824         /*
0825          * If this is a GET, but not NOMAX, it means that the extra
0826          * data is not bounded by userspace, but by max_tokens. Thus
0827          * set the length to max_tokens. This matches the extra data
0828          * allocation.
0829          * The driver should fill it with the number of tokens it
0830          * provided, and it may check iwp->length rather than having
0831          * knowledge of max_tokens. If the driver doesn't change the
0832          * iwp->length, this ioctl just copies back max_token tokens
0833          * filled with zeroes. Hopefully the driver isn't claiming
0834          * them to be valid data.
0835          */
0836         iwp->length = descr->max_tokens;
0837     }
0838 
0839     err = handler(dev, info, (union iwreq_data *) iwp, extra);
0840 
0841     iwp->length += essid_compat;
0842 
0843     /* If we have something to return to the user */
0844     if (!err && IW_IS_GET(cmd)) {
0845         /* Check if there is enough buffer up there */
0846         if (user_length < iwp->length) {
0847             err = -E2BIG;
0848             goto out;
0849         }
0850 
0851         if (copy_to_user(iwp->pointer, extra,
0852                  iwp->length *
0853                  descr->token_size)) {
0854             err = -EFAULT;
0855             goto out;
0856         }
0857     }
0858 
0859     /* Generate an event to notify listeners of the change */
0860     if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
0861         ((err == 0) || (err == -EIWCOMMIT))) {
0862         union iwreq_data *data = (union iwreq_data *) iwp;
0863 
0864         if (descr->flags & IW_DESCR_FLAG_RESTRICT)
0865             /* If the event is restricted, don't
0866              * export the payload.
0867              */
0868             wireless_send_event(dev, cmd, data, NULL);
0869         else
0870             wireless_send_event(dev, cmd, data, extra);
0871     }
0872 
0873 out:
0874     kfree(extra);
0875     return err;
0876 }
0877 
0878 /*
0879  * Call the commit handler in the driver
0880  * (if exist and if conditions are right)
0881  *
0882  * Note : our current commit strategy is currently pretty dumb,
0883  * but we will be able to improve on that...
0884  * The goal is to try to agreagate as many changes as possible
0885  * before doing the commit. Drivers that will define a commit handler
0886  * are usually those that need a reset after changing parameters, so
0887  * we want to minimise the number of reset.
0888  * A cool idea is to use a timer : at each "set" command, we re-set the
0889  * timer, when the timer eventually fires, we call the driver.
0890  * Hopefully, more on that later.
0891  *
0892  * Also, I'm waiting to see how many people will complain about the
0893  * netif_running(dev) test. I'm open on that one...
0894  * Hopefully, the driver will remember to do a commit in "open()" ;-)
0895  */
0896 int call_commit_handler(struct net_device *dev)
0897 {
0898 #ifdef CONFIG_WIRELESS_EXT
0899     if (netif_running(dev) &&
0900         dev->wireless_handlers &&
0901         dev->wireless_handlers->standard[0])
0902         /* Call the commit handler on the driver */
0903         return dev->wireless_handlers->standard[0](dev, NULL,
0904                                NULL, NULL);
0905     else
0906         return 0;       /* Command completed successfully */
0907 #else
0908     /* cfg80211 has no commit */
0909     return 0;
0910 #endif
0911 }
0912 
0913 /*
0914  * Main IOCTl dispatcher.
0915  * Check the type of IOCTL and call the appropriate wrapper...
0916  */
0917 static int wireless_process_ioctl(struct net *net, struct iwreq *iwr,
0918                   unsigned int cmd,
0919                   struct iw_request_info *info,
0920                   wext_ioctl_func standard,
0921                   wext_ioctl_func private)
0922 {
0923     struct net_device *dev;
0924     iw_handler  handler;
0925 
0926     /* Permissions are already checked in dev_ioctl() before calling us.
0927      * The copy_to/from_user() of ifr is also dealt with in there */
0928 
0929     /* Make sure the device exist */
0930     if ((dev = __dev_get_by_name(net, iwr->ifr_name)) == NULL)
0931         return -ENODEV;
0932 
0933     /* A bunch of special cases, then the generic case...
0934      * Note that 'cmd' is already filtered in dev_ioctl() with
0935      * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */
0936     if (cmd == SIOCGIWSTATS)
0937         return standard(dev, iwr, cmd, info,
0938                 &iw_handler_get_iwstats);
0939 
0940 #ifdef CONFIG_WEXT_PRIV
0941     if (cmd == SIOCGIWPRIV && dev->wireless_handlers)
0942         return standard(dev, iwr, cmd, info,
0943                 iw_handler_get_private);
0944 #endif
0945 
0946     /* Basic check */
0947     if (!netif_device_present(dev))
0948         return -ENODEV;
0949 
0950     /* New driver API : try to find the handler */
0951     handler = get_handler(dev, cmd);
0952     if (handler) {
0953         /* Standard and private are not the same */
0954         if (cmd < SIOCIWFIRSTPRIV)
0955             return standard(dev, iwr, cmd, info, handler);
0956         else if (private)
0957             return private(dev, iwr, cmd, info, handler);
0958     }
0959     return -EOPNOTSUPP;
0960 }
0961 
0962 /* If command is `set a parameter', or `get the encoding parameters',
0963  * check if the user has the right to do it.
0964  */
0965 static int wext_permission_check(unsigned int cmd)
0966 {
0967     if ((IW_IS_SET(cmd) || cmd == SIOCGIWENCODE ||
0968          cmd == SIOCGIWENCODEEXT) &&
0969         !capable(CAP_NET_ADMIN))
0970         return -EPERM;
0971 
0972     return 0;
0973 }
0974 
0975 /* entry point from dev ioctl */
0976 static int wext_ioctl_dispatch(struct net *net, struct iwreq *iwr,
0977                    unsigned int cmd, struct iw_request_info *info,
0978                    wext_ioctl_func standard,
0979                    wext_ioctl_func private)
0980 {
0981     int ret = wext_permission_check(cmd);
0982 
0983     if (ret)
0984         return ret;
0985 
0986     dev_load(net, iwr->ifr_name);
0987     rtnl_lock();
0988     ret = wireless_process_ioctl(net, iwr, cmd, info, standard, private);
0989     rtnl_unlock();
0990 
0991     return ret;
0992 }
0993 
0994 /*
0995  * Wrapper to call a standard Wireless Extension handler.
0996  * We do various checks and also take care of moving data between
0997  * user space and kernel space.
0998  */
0999 static int ioctl_standard_call(struct net_device *  dev,
1000                    struct iwreq     *iwr,
1001                    unsigned int     cmd,
1002                    struct iw_request_info   *info,
1003                    iw_handler       handler)
1004 {
1005     const struct iw_ioctl_description * descr;
1006     int                 ret = -EINVAL;
1007 
1008     /* Get the description of the IOCTL */
1009     if (IW_IOCTL_IDX(cmd) >= standard_ioctl_num)
1010         return -EOPNOTSUPP;
1011     descr = &(standard_ioctl[IW_IOCTL_IDX(cmd)]);
1012 
1013     /* Check if we have a pointer to user space data or not */
1014     if (descr->header_type != IW_HEADER_TYPE_POINT) {
1015 
1016         /* No extra arguments. Trivial to handle */
1017         ret = handler(dev, info, &(iwr->u), NULL);
1018 
1019         /* Generate an event to notify listeners of the change */
1020         if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
1021            ((ret == 0) || (ret == -EIWCOMMIT)))
1022             wireless_send_event(dev, cmd, &(iwr->u), NULL);
1023     } else {
1024         ret = ioctl_standard_iw_point(&iwr->u.data, cmd, descr,
1025                           handler, dev, info);
1026     }
1027 
1028     /* Call commit handler if needed and defined */
1029     if (ret == -EIWCOMMIT)
1030         ret = call_commit_handler(dev);
1031 
1032     /* Here, we will generate the appropriate event if needed */
1033 
1034     return ret;
1035 }
1036 
1037 
1038 int wext_handle_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1039 {
1040     struct iw_request_info info = { .cmd = cmd, .flags = 0 };
1041     struct iwreq iwr;
1042     int ret;
1043 
1044     if (copy_from_user(&iwr, arg, sizeof(iwr)))
1045         return -EFAULT;
1046 
1047     iwr.ifr_name[sizeof(iwr.ifr_name) - 1] = 0;
1048 
1049     ret = wext_ioctl_dispatch(net, &iwr, cmd, &info,
1050                   ioctl_standard_call,
1051                   ioctl_private_call);
1052     if (ret >= 0 &&
1053         IW_IS_GET(cmd) &&
1054         copy_to_user(arg, &iwr, sizeof(struct iwreq)))
1055         return -EFAULT;
1056 
1057     return ret;
1058 }
1059 
1060 #ifdef CONFIG_COMPAT
1061 static int compat_standard_call(struct net_device   *dev,
1062                 struct iwreq        *iwr,
1063                 unsigned int        cmd,
1064                 struct iw_request_info  *info,
1065                 iw_handler      handler)
1066 {
1067     const struct iw_ioctl_description *descr;
1068     struct compat_iw_point *iwp_compat;
1069     struct iw_point iwp;
1070     int err;
1071 
1072     descr = standard_ioctl + IW_IOCTL_IDX(cmd);
1073 
1074     if (descr->header_type != IW_HEADER_TYPE_POINT)
1075         return ioctl_standard_call(dev, iwr, cmd, info, handler);
1076 
1077     iwp_compat = (struct compat_iw_point *) &iwr->u.data;
1078     iwp.pointer = compat_ptr(iwp_compat->pointer);
1079     iwp.length = iwp_compat->length;
1080     iwp.flags = iwp_compat->flags;
1081 
1082     err = ioctl_standard_iw_point(&iwp, cmd, descr, handler, dev, info);
1083 
1084     iwp_compat->pointer = ptr_to_compat(iwp.pointer);
1085     iwp_compat->length = iwp.length;
1086     iwp_compat->flags = iwp.flags;
1087 
1088     return err;
1089 }
1090 
1091 int compat_wext_handle_ioctl(struct net *net, unsigned int cmd,
1092                  unsigned long arg)
1093 {
1094     void __user *argp = (void __user *)arg;
1095     struct iw_request_info info;
1096     struct iwreq iwr;
1097     char *colon;
1098     int ret;
1099 
1100     if (copy_from_user(&iwr, argp, sizeof(struct iwreq)))
1101         return -EFAULT;
1102 
1103     iwr.ifr_name[IFNAMSIZ-1] = 0;
1104     colon = strchr(iwr.ifr_name, ':');
1105     if (colon)
1106         *colon = 0;
1107 
1108     info.cmd = cmd;
1109     info.flags = IW_REQUEST_FLAG_COMPAT;
1110 
1111     ret = wext_ioctl_dispatch(net, &iwr, cmd, &info,
1112                   compat_standard_call,
1113                   compat_private_call);
1114 
1115     if (ret >= 0 &&
1116         IW_IS_GET(cmd) &&
1117         copy_to_user(argp, &iwr, sizeof(struct iwreq)))
1118         return -EFAULT;
1119 
1120     return ret;
1121 }
1122 #endif
1123 
1124 char *iwe_stream_add_event(struct iw_request_info *info, char *stream,
1125                char *ends, struct iw_event *iwe, int event_len)
1126 {
1127     int lcp_len = iwe_stream_lcp_len(info);
1128 
1129     event_len = iwe_stream_event_len_adjust(info, event_len);
1130 
1131     /* Check if it's possible */
1132     if (likely((stream + event_len) < ends)) {
1133         iwe->len = event_len;
1134         /* Beware of alignement issues on 64 bits */
1135         memcpy(stream, (char *) iwe, IW_EV_LCP_PK_LEN);
1136         memcpy(stream + lcp_len, &iwe->u,
1137                event_len - lcp_len);
1138         stream += event_len;
1139     }
1140 
1141     return stream;
1142 }
1143 EXPORT_SYMBOL(iwe_stream_add_event);
1144 
1145 char *iwe_stream_add_point(struct iw_request_info *info, char *stream,
1146                char *ends, struct iw_event *iwe, char *extra)
1147 {
1148     int event_len = iwe_stream_point_len(info) + iwe->u.data.length;
1149     int point_len = iwe_stream_point_len(info);
1150     int lcp_len   = iwe_stream_lcp_len(info);
1151 
1152     /* Check if it's possible */
1153     if (likely((stream + event_len) < ends)) {
1154         iwe->len = event_len;
1155         memcpy(stream, (char *) iwe, IW_EV_LCP_PK_LEN);
1156         memcpy(stream + lcp_len,
1157                ((char *) &iwe->u) + IW_EV_POINT_OFF,
1158                IW_EV_POINT_PK_LEN - IW_EV_LCP_PK_LEN);
1159         if (iwe->u.data.length && extra)
1160             memcpy(stream + point_len, extra, iwe->u.data.length);
1161         stream += event_len;
1162     }
1163 
1164     return stream;
1165 }
1166 EXPORT_SYMBOL(iwe_stream_add_point);
1167 
1168 char *iwe_stream_add_value(struct iw_request_info *info, char *event,
1169                char *value, char *ends, struct iw_event *iwe,
1170                int event_len)
1171 {
1172     int lcp_len = iwe_stream_lcp_len(info);
1173 
1174     /* Don't duplicate LCP */
1175     event_len -= IW_EV_LCP_LEN;
1176 
1177     /* Check if it's possible */
1178     if (likely((value + event_len) < ends)) {
1179         /* Add new value */
1180         memcpy(value, &iwe->u, event_len);
1181         value += event_len;
1182         /* Patch LCP */
1183         iwe->len = value - event;
1184         memcpy(event, (char *) iwe, lcp_len);
1185     }
1186 
1187     return value;
1188 }
1189 EXPORT_SYMBOL(iwe_stream_add_value);
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