1/* 2 * This file implement the Wireless Extensions core API. 3 * 4 * Authors : Jean Tourrilhes - HPL - <jt@hpl.hp.com> 5 * Copyright (c) 1997-2007 Jean Tourrilhes, All Rights Reserved. 6 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net> 7 * 8 * (As all part of the Linux kernel, this file is GPL) 9 */ 10#include <linux/kernel.h> 11#include <linux/netdevice.h> 12#include <linux/rtnetlink.h> 13#include <linux/slab.h> 14#include <linux/wireless.h> 15#include <linux/uaccess.h> 16#include <linux/export.h> 17#include <net/cfg80211.h> 18#include <net/iw_handler.h> 19#include <net/netlink.h> 20#include <net/wext.h> 21#include <net/net_namespace.h> 22 23typedef int (*wext_ioctl_func)(struct net_device *, struct iwreq *, 24 unsigned int, struct iw_request_info *, 25 iw_handler); 26 27 28/* 29 * Meta-data about all the standard Wireless Extension request we 30 * know about. 31 */ 32static const struct iw_ioctl_description standard_ioctl[] = { 33 [IW_IOCTL_IDX(SIOCSIWCOMMIT)] = { 34 .header_type = IW_HEADER_TYPE_NULL, 35 }, 36 [IW_IOCTL_IDX(SIOCGIWNAME)] = { 37 .header_type = IW_HEADER_TYPE_CHAR, 38 .flags = IW_DESCR_FLAG_DUMP, 39 }, 40 [IW_IOCTL_IDX(SIOCSIWNWID)] = { 41 .header_type = IW_HEADER_TYPE_PARAM, 42 .flags = IW_DESCR_FLAG_EVENT, 43 }, 44 [IW_IOCTL_IDX(SIOCGIWNWID)] = { 45 .header_type = IW_HEADER_TYPE_PARAM, 46 .flags = IW_DESCR_FLAG_DUMP, 47 }, 48 [IW_IOCTL_IDX(SIOCSIWFREQ)] = { 49 .header_type = IW_HEADER_TYPE_FREQ, 50 .flags = IW_DESCR_FLAG_EVENT, 51 }, 52 [IW_IOCTL_IDX(SIOCGIWFREQ)] = { 53 .header_type = IW_HEADER_TYPE_FREQ, 54 .flags = IW_DESCR_FLAG_DUMP, 55 }, 56 [IW_IOCTL_IDX(SIOCSIWMODE)] = { 57 .header_type = IW_HEADER_TYPE_UINT, 58 .flags = IW_DESCR_FLAG_EVENT, 59 }, 60 [IW_IOCTL_IDX(SIOCGIWMODE)] = { 61 .header_type = IW_HEADER_TYPE_UINT, 62 .flags = IW_DESCR_FLAG_DUMP, 63 }, 64 [IW_IOCTL_IDX(SIOCSIWSENS)] = { 65 .header_type = IW_HEADER_TYPE_PARAM, 66 }, 67 [IW_IOCTL_IDX(SIOCGIWSENS)] = { 68 .header_type = IW_HEADER_TYPE_PARAM, 69 }, 70 [IW_IOCTL_IDX(SIOCSIWRANGE)] = { 71 .header_type = IW_HEADER_TYPE_NULL, 72 }, 73 [IW_IOCTL_IDX(SIOCGIWRANGE)] = { 74 .header_type = IW_HEADER_TYPE_POINT, 75 .token_size = 1, 76 .max_tokens = sizeof(struct iw_range), 77 .flags = IW_DESCR_FLAG_DUMP, 78 }, 79 [IW_IOCTL_IDX(SIOCSIWPRIV)] = { 80 .header_type = IW_HEADER_TYPE_NULL, 81 }, 82 [IW_IOCTL_IDX(SIOCGIWPRIV)] = { /* (handled directly by us) */ 83 .header_type = IW_HEADER_TYPE_POINT, 84 .token_size = sizeof(struct iw_priv_args), 85 .max_tokens = 16, 86 .flags = IW_DESCR_FLAG_NOMAX, 87 }, 88 [IW_IOCTL_IDX(SIOCSIWSTATS)] = { 89 .header_type = IW_HEADER_TYPE_NULL, 90 }, 91 [IW_IOCTL_IDX(SIOCGIWSTATS)] = { /* (handled directly by us) */ 92 .header_type = IW_HEADER_TYPE_POINT, 93 .token_size = 1, 94 .max_tokens = sizeof(struct iw_statistics), 95 .flags = IW_DESCR_FLAG_DUMP, 96 }, 97 [IW_IOCTL_IDX(SIOCSIWSPY)] = { 98 .header_type = IW_HEADER_TYPE_POINT, 99 .token_size = sizeof(struct sockaddr), 100 .max_tokens = IW_MAX_SPY, 101 }, 102 [IW_IOCTL_IDX(SIOCGIWSPY)] = { 103 .header_type = IW_HEADER_TYPE_POINT, 104 .token_size = sizeof(struct sockaddr) + 105 sizeof(struct iw_quality), 106 .max_tokens = IW_MAX_SPY, 107 }, 108 [IW_IOCTL_IDX(SIOCSIWTHRSPY)] = { 109 .header_type = IW_HEADER_TYPE_POINT, 110 .token_size = sizeof(struct iw_thrspy), 111 .min_tokens = 1, 112 .max_tokens = 1, 113 }, 114 [IW_IOCTL_IDX(SIOCGIWTHRSPY)] = { 115 .header_type = IW_HEADER_TYPE_POINT, 116 .token_size = sizeof(struct iw_thrspy), 117 .min_tokens = 1, 118 .max_tokens = 1, 119 }, 120 [IW_IOCTL_IDX(SIOCSIWAP)] = { 121 .header_type = IW_HEADER_TYPE_ADDR, 122 }, 123 [IW_IOCTL_IDX(SIOCGIWAP)] = { 124 .header_type = IW_HEADER_TYPE_ADDR, 125 .flags = IW_DESCR_FLAG_DUMP, 126 }, 127 [IW_IOCTL_IDX(SIOCSIWMLME)] = { 128 .header_type = IW_HEADER_TYPE_POINT, 129 .token_size = 1, 130 .min_tokens = sizeof(struct iw_mlme), 131 .max_tokens = sizeof(struct iw_mlme), 132 }, 133 [IW_IOCTL_IDX(SIOCGIWAPLIST)] = { 134 .header_type = IW_HEADER_TYPE_POINT, 135 .token_size = sizeof(struct sockaddr) + 136 sizeof(struct iw_quality), 137 .max_tokens = IW_MAX_AP, 138 .flags = IW_DESCR_FLAG_NOMAX, 139 }, 140 [IW_IOCTL_IDX(SIOCSIWSCAN)] = { 141 .header_type = IW_HEADER_TYPE_POINT, 142 .token_size = 1, 143 .min_tokens = 0, 144 .max_tokens = sizeof(struct iw_scan_req), 145 }, 146 [IW_IOCTL_IDX(SIOCGIWSCAN)] = { 147 .header_type = IW_HEADER_TYPE_POINT, 148 .token_size = 1, 149 .max_tokens = IW_SCAN_MAX_DATA, 150 .flags = IW_DESCR_FLAG_NOMAX, 151 }, 152 [IW_IOCTL_IDX(SIOCSIWESSID)] = { 153 .header_type = IW_HEADER_TYPE_POINT, 154 .token_size = 1, 155 .max_tokens = IW_ESSID_MAX_SIZE, 156 .flags = IW_DESCR_FLAG_EVENT, 157 }, 158 [IW_IOCTL_IDX(SIOCGIWESSID)] = { 159 .header_type = IW_HEADER_TYPE_POINT, 160 .token_size = 1, 161 .max_tokens = IW_ESSID_MAX_SIZE, 162 .flags = IW_DESCR_FLAG_DUMP, 163 }, 164 [IW_IOCTL_IDX(SIOCSIWNICKN)] = { 165 .header_type = IW_HEADER_TYPE_POINT, 166 .token_size = 1, 167 .max_tokens = IW_ESSID_MAX_SIZE, 168 }, 169 [IW_IOCTL_IDX(SIOCGIWNICKN)] = { 170 .header_type = IW_HEADER_TYPE_POINT, 171 .token_size = 1, 172 .max_tokens = IW_ESSID_MAX_SIZE, 173 }, 174 [IW_IOCTL_IDX(SIOCSIWRATE)] = { 175 .header_type = IW_HEADER_TYPE_PARAM, 176 }, 177 [IW_IOCTL_IDX(SIOCGIWRATE)] = { 178 .header_type = IW_HEADER_TYPE_PARAM, 179 }, 180 [IW_IOCTL_IDX(SIOCSIWRTS)] = { 181 .header_type = IW_HEADER_TYPE_PARAM, 182 }, 183 [IW_IOCTL_IDX(SIOCGIWRTS)] = { 184 .header_type = IW_HEADER_TYPE_PARAM, 185 }, 186 [IW_IOCTL_IDX(SIOCSIWFRAG)] = { 187 .header_type = IW_HEADER_TYPE_PARAM, 188 }, 189 [IW_IOCTL_IDX(SIOCGIWFRAG)] = { 190 .header_type = IW_HEADER_TYPE_PARAM, 191 }, 192 [IW_IOCTL_IDX(SIOCSIWTXPOW)] = { 193 .header_type = IW_HEADER_TYPE_PARAM, 194 }, 195 [IW_IOCTL_IDX(SIOCGIWTXPOW)] = { 196 .header_type = IW_HEADER_TYPE_PARAM, 197 }, 198 [IW_IOCTL_IDX(SIOCSIWRETRY)] = { 199 .header_type = IW_HEADER_TYPE_PARAM, 200 }, 201 [IW_IOCTL_IDX(SIOCGIWRETRY)] = { 202 .header_type = IW_HEADER_TYPE_PARAM, 203 }, 204 [IW_IOCTL_IDX(SIOCSIWENCODE)] = { 205 .header_type = IW_HEADER_TYPE_POINT, 206 .token_size = 1, 207 .max_tokens = IW_ENCODING_TOKEN_MAX, 208 .flags = IW_DESCR_FLAG_EVENT | IW_DESCR_FLAG_RESTRICT, 209 }, 210 [IW_IOCTL_IDX(SIOCGIWENCODE)] = { 211 .header_type = IW_HEADER_TYPE_POINT, 212 .token_size = 1, 213 .max_tokens = IW_ENCODING_TOKEN_MAX, 214 .flags = IW_DESCR_FLAG_DUMP | IW_DESCR_FLAG_RESTRICT, 215 }, 216 [IW_IOCTL_IDX(SIOCSIWPOWER)] = { 217 .header_type = IW_HEADER_TYPE_PARAM, 218 }, 219 [IW_IOCTL_IDX(SIOCGIWPOWER)] = { 220 .header_type = IW_HEADER_TYPE_PARAM, 221 }, 222 [IW_IOCTL_IDX(SIOCSIWGENIE)] = { 223 .header_type = IW_HEADER_TYPE_POINT, 224 .token_size = 1, 225 .max_tokens = IW_GENERIC_IE_MAX, 226 }, 227 [IW_IOCTL_IDX(SIOCGIWGENIE)] = { 228 .header_type = IW_HEADER_TYPE_POINT, 229 .token_size = 1, 230 .max_tokens = IW_GENERIC_IE_MAX, 231 }, 232 [IW_IOCTL_IDX(SIOCSIWAUTH)] = { 233 .header_type = IW_HEADER_TYPE_PARAM, 234 }, 235 [IW_IOCTL_IDX(SIOCGIWAUTH)] = { 236 .header_type = IW_HEADER_TYPE_PARAM, 237 }, 238 [IW_IOCTL_IDX(SIOCSIWENCODEEXT)] = { 239 .header_type = IW_HEADER_TYPE_POINT, 240 .token_size = 1, 241 .min_tokens = sizeof(struct iw_encode_ext), 242 .max_tokens = sizeof(struct iw_encode_ext) + 243 IW_ENCODING_TOKEN_MAX, 244 }, 245 [IW_IOCTL_IDX(SIOCGIWENCODEEXT)] = { 246 .header_type = IW_HEADER_TYPE_POINT, 247 .token_size = 1, 248 .min_tokens = sizeof(struct iw_encode_ext), 249 .max_tokens = sizeof(struct iw_encode_ext) + 250 IW_ENCODING_TOKEN_MAX, 251 }, 252 [IW_IOCTL_IDX(SIOCSIWPMKSA)] = { 253 .header_type = IW_HEADER_TYPE_POINT, 254 .token_size = 1, 255 .min_tokens = sizeof(struct iw_pmksa), 256 .max_tokens = sizeof(struct iw_pmksa), 257 }, 258}; 259static const unsigned int standard_ioctl_num = ARRAY_SIZE(standard_ioctl); 260 261/* 262 * Meta-data about all the additional standard Wireless Extension events 263 * we know about. 264 */ 265static const struct iw_ioctl_description standard_event[] = { 266 [IW_EVENT_IDX(IWEVTXDROP)] = { 267 .header_type = IW_HEADER_TYPE_ADDR, 268 }, 269 [IW_EVENT_IDX(IWEVQUAL)] = { 270 .header_type = IW_HEADER_TYPE_QUAL, 271 }, 272 [IW_EVENT_IDX(IWEVCUSTOM)] = { 273 .header_type = IW_HEADER_TYPE_POINT, 274 .token_size = 1, 275 .max_tokens = IW_CUSTOM_MAX, 276 }, 277 [IW_EVENT_IDX(IWEVREGISTERED)] = { 278 .header_type = IW_HEADER_TYPE_ADDR, 279 }, 280 [IW_EVENT_IDX(IWEVEXPIRED)] = { 281 .header_type = IW_HEADER_TYPE_ADDR, 282 }, 283 [IW_EVENT_IDX(IWEVGENIE)] = { 284 .header_type = IW_HEADER_TYPE_POINT, 285 .token_size = 1, 286 .max_tokens = IW_GENERIC_IE_MAX, 287 }, 288 [IW_EVENT_IDX(IWEVMICHAELMICFAILURE)] = { 289 .header_type = IW_HEADER_TYPE_POINT, 290 .token_size = 1, 291 .max_tokens = sizeof(struct iw_michaelmicfailure), 292 }, 293 [IW_EVENT_IDX(IWEVASSOCREQIE)] = { 294 .header_type = IW_HEADER_TYPE_POINT, 295 .token_size = 1, 296 .max_tokens = IW_GENERIC_IE_MAX, 297 }, 298 [IW_EVENT_IDX(IWEVASSOCRESPIE)] = { 299 .header_type = IW_HEADER_TYPE_POINT, 300 .token_size = 1, 301 .max_tokens = IW_GENERIC_IE_MAX, 302 }, 303 [IW_EVENT_IDX(IWEVPMKIDCAND)] = { 304 .header_type = IW_HEADER_TYPE_POINT, 305 .token_size = 1, 306 .max_tokens = sizeof(struct iw_pmkid_cand), 307 }, 308}; 309static const unsigned int standard_event_num = ARRAY_SIZE(standard_event); 310 311/* Size (in bytes) of various events */ 312static const int event_type_size[] = { 313 IW_EV_LCP_LEN, /* IW_HEADER_TYPE_NULL */ 314 0, 315 IW_EV_CHAR_LEN, /* IW_HEADER_TYPE_CHAR */ 316 0, 317 IW_EV_UINT_LEN, /* IW_HEADER_TYPE_UINT */ 318 IW_EV_FREQ_LEN, /* IW_HEADER_TYPE_FREQ */ 319 IW_EV_ADDR_LEN, /* IW_HEADER_TYPE_ADDR */ 320 0, 321 IW_EV_POINT_LEN, /* Without variable payload */ 322 IW_EV_PARAM_LEN, /* IW_HEADER_TYPE_PARAM */ 323 IW_EV_QUAL_LEN, /* IW_HEADER_TYPE_QUAL */ 324}; 325 326#ifdef CONFIG_COMPAT 327static const int compat_event_type_size[] = { 328 IW_EV_COMPAT_LCP_LEN, /* IW_HEADER_TYPE_NULL */ 329 0, 330 IW_EV_COMPAT_CHAR_LEN, /* IW_HEADER_TYPE_CHAR */ 331 0, 332 IW_EV_COMPAT_UINT_LEN, /* IW_HEADER_TYPE_UINT */ 333 IW_EV_COMPAT_FREQ_LEN, /* IW_HEADER_TYPE_FREQ */ 334 IW_EV_COMPAT_ADDR_LEN, /* IW_HEADER_TYPE_ADDR */ 335 0, 336 IW_EV_COMPAT_POINT_LEN, /* Without variable payload */ 337 IW_EV_COMPAT_PARAM_LEN, /* IW_HEADER_TYPE_PARAM */ 338 IW_EV_COMPAT_QUAL_LEN, /* IW_HEADER_TYPE_QUAL */ 339}; 340#endif 341 342 343/* IW event code */ 344 345void wireless_nlevent_flush(void) 346{ 347 struct sk_buff *skb; 348 struct net *net; 349 350 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} 358EXPORT_SYMBOL_GPL(wireless_nlevent_flush); 359 360static int wext_netdev_notifier_call(struct notifier_block *nb, 361 unsigned long state, void *ptr) 362{ 363 /* 364 * When a netdev changes state in any way, flush all pending messages 365 * to avoid them going out in a strange order, e.g. RTM_NEWLINK after 366 * RTM_DELLINK, or with IFF_UP after without IFF_UP during dev_close() 367 * or similar - all of which could otherwise happen due to delays from 368 * schedule_work(). 369 */ 370 wireless_nlevent_flush(); 371 372 return NOTIFY_OK; 373} 374 375static struct notifier_block wext_netdev_notifier = { 376 .notifier_call = wext_netdev_notifier_call, 377}; 378 379static int __net_init wext_pernet_init(struct net *net) 380{ 381 skb_queue_head_init(&net->wext_nlevents); 382 return 0; 383} 384 385static void __net_exit wext_pernet_exit(struct net *net) 386{ 387 skb_queue_purge(&net->wext_nlevents); 388} 389 390static struct pernet_operations wext_pernet_ops = { 391 .init = wext_pernet_init, 392 .exit = wext_pernet_exit, 393}; 394 395static int __init wireless_nlevent_init(void) 396{ 397 int err = register_pernet_subsys(&wext_pernet_ops); 398 399 if (err) 400 return err; 401 402 err = register_netdevice_notifier(&wext_netdev_notifier); 403 if (err) 404 unregister_pernet_subsys(&wext_pernet_ops); 405 return err; 406} 407 408subsys_initcall(wireless_nlevent_init); 409 410/* Process events generated by the wireless layer or the driver. */ 411static void wireless_nlevent_process(struct work_struct *work) 412{ 413 wireless_nlevent_flush(); 414} 415 416static DECLARE_WORK(wireless_nlevent_work, wireless_nlevent_process); 417 418static 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 */ 451void 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} 634EXPORT_SYMBOL(wireless_send_event); 635 636 637 638/* IW handlers */ 639 640struct 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 */ 661static 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 683static 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 717static 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 /* Sanity-check to ensure we never end up _allocating_ zero 800 * bytes of data for extra. 801 */ 802 if (extra_size <= 0) 803 return -EFAULT; 804 805 /* kzalloc() ensures NULL-termination for essid_compat. */ 806 extra = kzalloc(extra_size, GFP_KERNEL); 807 if (!extra) 808 return -ENOMEM; 809 810 /* If it is a SET, get all the extra data in here */ 811 if (IW_IS_SET(cmd) && (iwp->length != 0)) { 812 if (copy_from_user(extra, iwp->pointer, 813 iwp->length * 814 descr->token_size)) { 815 err = -EFAULT; 816 goto out; 817 } 818 819 if (cmd == SIOCSIWENCODEEXT) { 820 struct iw_encode_ext *ee = (void *) extra; 821 822 if (iwp->length < sizeof(*ee) + ee->key_len) { 823 err = -EFAULT; 824 goto out; 825 } 826 } 827 } 828 829 if (IW_IS_GET(cmd) && !(descr->flags & IW_DESCR_FLAG_NOMAX)) { 830 /* 831 * If this is a GET, but not NOMAX, it means that the extra 832 * data is not bounded by userspace, but by max_tokens. Thus 833 * set the length to max_tokens. This matches the extra data 834 * allocation. 835 * The driver should fill it with the number of tokens it 836 * provided, and it may check iwp->length rather than having 837 * knowledge of max_tokens. If the driver doesn't change the 838 * iwp->length, this ioctl just copies back max_token tokens 839 * filled with zeroes. Hopefully the driver isn't claiming 840 * them to be valid data. 841 */ 842 iwp->length = descr->max_tokens; 843 } 844 845 err = handler(dev, info, (union iwreq_data *) iwp, extra); 846 847 iwp->length += essid_compat; 848 849 /* If we have something to return to the user */ 850 if (!err && IW_IS_GET(cmd)) { 851 /* Check if there is enough buffer up there */ 852 if (user_length < iwp->length) { 853 err = -E2BIG; 854 goto out; 855 } 856 857 if (copy_to_user(iwp->pointer, extra, 858 iwp->length * 859 descr->token_size)) { 860 err = -EFAULT; 861 goto out; 862 } 863 } 864 865 /* Generate an event to notify listeners of the change */ 866 if ((descr->flags & IW_DESCR_FLAG_EVENT) && 867 ((err == 0) || (err == -EIWCOMMIT))) { 868 union iwreq_data *data = (union iwreq_data *) iwp; 869 870 if (descr->flags & IW_DESCR_FLAG_RESTRICT) 871 /* If the event is restricted, don't 872 * export the payload. 873 */ 874 wireless_send_event(dev, cmd, data, NULL); 875 else 876 wireless_send_event(dev, cmd, data, extra); 877 } 878 879out: 880 kfree(extra); 881 return err; 882} 883 884/* 885 * Call the commit handler in the driver 886 * (if exist and if conditions are right) 887 * 888 * Note : our current commit strategy is currently pretty dumb, 889 * but we will be able to improve on that... 890 * The goal is to try to agreagate as many changes as possible 891 * before doing the commit. Drivers that will define a commit handler 892 * are usually those that need a reset after changing parameters, so 893 * we want to minimise the number of reset. 894 * A cool idea is to use a timer : at each "set" command, we re-set the 895 * timer, when the timer eventually fires, we call the driver. 896 * Hopefully, more on that later. 897 * 898 * Also, I'm waiting to see how many people will complain about the 899 * netif_running(dev) test. I'm open on that one... 900 * Hopefully, the driver will remember to do a commit in "open()" ;-) 901 */ 902int call_commit_handler(struct net_device *dev) 903{ 904#ifdef CONFIG_WIRELESS_EXT 905 if (netif_running(dev) && 906 dev->wireless_handlers && 907 dev->wireless_handlers->standard[0]) 908 /* Call the commit handler on the driver */ 909 return dev->wireless_handlers->standard[0](dev, NULL, 910 NULL, NULL); 911 else 912 return 0; /* Command completed successfully */ 913#else 914 /* cfg80211 has no commit */ 915 return 0; 916#endif 917} 918 919/* 920 * Main IOCTl dispatcher. 921 * Check the type of IOCTL and call the appropriate wrapper... 922 */ 923static int wireless_process_ioctl(struct net *net, struct iwreq *iwr, 924 unsigned int cmd, 925 struct iw_request_info *info, 926 wext_ioctl_func standard, 927 wext_ioctl_func private) 928{ 929 struct net_device *dev; 930 iw_handler handler; 931 932 /* Permissions are already checked in dev_ioctl() before calling us. 933 * The copy_to/from_user() of ifr is also dealt with in there */ 934 935 /* Make sure the device exist */ 936 if ((dev = __dev_get_by_name(net, iwr->ifr_name)) == NULL) 937 return -ENODEV; 938 939 /* A bunch of special cases, then the generic case... 940 * Note that 'cmd' is already filtered in dev_ioctl() with 941 * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */ 942 if (cmd == SIOCGIWSTATS) 943 return standard(dev, iwr, cmd, info, 944 &iw_handler_get_iwstats); 945 946#ifdef CONFIG_WEXT_PRIV 947 if (cmd == SIOCGIWPRIV && dev->wireless_handlers) 948 return standard(dev, iwr, cmd, info, 949 iw_handler_get_private); 950#endif 951 952 /* Basic check */ 953 if (!netif_device_present(dev)) 954 return -ENODEV; 955 956 /* New driver API : try to find the handler */ 957 handler = get_handler(dev, cmd); 958 if (handler) { 959 /* Standard and private are not the same */ 960 if (cmd < SIOCIWFIRSTPRIV) 961 return standard(dev, iwr, cmd, info, handler); 962 else if (private) 963 return private(dev, iwr, cmd, info, handler); 964 } 965 return -EOPNOTSUPP; 966} 967 968/* If command is `set a parameter', or `get the encoding parameters', 969 * check if the user has the right to do it. 970 */ 971static int wext_permission_check(unsigned int cmd) 972{ 973 if ((IW_IS_SET(cmd) || cmd == SIOCGIWENCODE || 974 cmd == SIOCGIWENCODEEXT) && 975 !capable(CAP_NET_ADMIN)) 976 return -EPERM; 977 978 return 0; 979} 980 981/* entry point from dev ioctl */ 982static int wext_ioctl_dispatch(struct net *net, struct iwreq *iwr, 983 unsigned int cmd, struct iw_request_info *info, 984 wext_ioctl_func standard, 985 wext_ioctl_func private) 986{ 987 int ret = wext_permission_check(cmd); 988 989 if (ret) 990 return ret; 991 992 dev_load(net, iwr->ifr_name); 993 rtnl_lock(); 994 ret = wireless_process_ioctl(net, iwr, cmd, info, standard, private); 995 rtnl_unlock(); 996 997 return ret; 998} 999 1000/* 1001 * Wrapper to call a standard Wireless Extension handler. 1002 * We do various checks and also take care of moving data between 1003 * user space and kernel space. 1004 */ 1005static int ioctl_standard_call(struct net_device * dev, 1006 struct iwreq *iwr, 1007 unsigned int cmd, 1008 struct iw_request_info *info, 1009 iw_handler handler) 1010{ 1011 const struct iw_ioctl_description * descr; 1012 int ret = -EINVAL; 1013 1014 /* Get the description of the IOCTL */ 1015 if (IW_IOCTL_IDX(cmd) >= standard_ioctl_num) 1016 return -EOPNOTSUPP; 1017 descr = &(standard_ioctl[IW_IOCTL_IDX(cmd)]); 1018 1019 /* Check if we have a pointer to user space data or not */ 1020 if (descr->header_type != IW_HEADER_TYPE_POINT) { 1021 1022 /* No extra arguments. Trivial to handle */ 1023 ret = handler(dev, info, &(iwr->u), NULL); 1024 1025 /* Generate an event to notify listeners of the change */ 1026 if ((descr->flags & IW_DESCR_FLAG_EVENT) && 1027 ((ret == 0) || (ret == -EIWCOMMIT))) 1028 wireless_send_event(dev, cmd, &(iwr->u), NULL); 1029 } else { 1030 ret = ioctl_standard_iw_point(&iwr->u.data, cmd, descr, 1031 handler, dev, info); 1032 } 1033 1034 /* Call commit handler if needed and defined */ 1035 if (ret == -EIWCOMMIT) 1036 ret = call_commit_handler(dev); 1037 1038 /* Here, we will generate the appropriate event if needed */ 1039 1040 return ret; 1041} 1042 1043 1044int wext_handle_ioctl(struct net *net, unsigned int cmd, void __user *arg) 1045{ 1046 struct iw_request_info info = { .cmd = cmd, .flags = 0 }; 1047 struct iwreq iwr; 1048 int ret; 1049 1050 if (copy_from_user(&iwr, arg, sizeof(iwr))) 1051 return -EFAULT; 1052 1053 iwr.ifr_name[sizeof(iwr.ifr_name) - 1] = 0; 1054 1055 ret = wext_ioctl_dispatch(net, &iwr, cmd, &info, 1056 ioctl_standard_call, 1057 ioctl_private_call); 1058 if (ret >= 0 && 1059 IW_IS_GET(cmd) && 1060 copy_to_user(arg, &iwr, sizeof(struct iwreq))) 1061 return -EFAULT; 1062 1063 return ret; 1064} 1065 1066#ifdef CONFIG_COMPAT 1067static int compat_standard_call(struct net_device *dev, 1068 struct iwreq *iwr, 1069 unsigned int cmd, 1070 struct iw_request_info *info, 1071 iw_handler handler) 1072{ 1073 const struct iw_ioctl_description *descr; 1074 struct compat_iw_point *iwp_compat; 1075 struct iw_point iwp; 1076 int err; 1077 1078 descr = standard_ioctl + IW_IOCTL_IDX(cmd); 1079 1080 if (descr->header_type != IW_HEADER_TYPE_POINT) 1081 return ioctl_standard_call(dev, iwr, cmd, info, handler); 1082 1083 iwp_compat = (struct compat_iw_point *) &iwr->u.data; 1084 iwp.pointer = compat_ptr(iwp_compat->pointer); 1085 iwp.length = iwp_compat->length; 1086 iwp.flags = iwp_compat->flags; 1087 1088 err = ioctl_standard_iw_point(&iwp, cmd, descr, handler, dev, info); 1089 1090 iwp_compat->pointer = ptr_to_compat(iwp.pointer); 1091 iwp_compat->length = iwp.length; 1092 iwp_compat->flags = iwp.flags; 1093 1094 return err; 1095} 1096 1097int compat_wext_handle_ioctl(struct net *net, unsigned int cmd, 1098 unsigned long arg) 1099{ 1100 void __user *argp = (void __user *)arg; 1101 struct iw_request_info info; 1102 struct iwreq iwr; 1103 char *colon; 1104 int ret; 1105 1106 if (copy_from_user(&iwr, argp, sizeof(struct iwreq))) 1107 return -EFAULT; 1108 1109 iwr.ifr_name[IFNAMSIZ-1] = 0; 1110 colon = strchr(iwr.ifr_name, ':'); 1111 if (colon) 1112 *colon = 0; 1113 1114 info.cmd = cmd; 1115 info.flags = IW_REQUEST_FLAG_COMPAT; 1116 1117 ret = wext_ioctl_dispatch(net, &iwr, cmd, &info, 1118 compat_standard_call, 1119 compat_private_call); 1120 1121 if (ret >= 0 && 1122 IW_IS_GET(cmd) && 1123 copy_to_user(argp, &iwr, sizeof(struct iwreq))) 1124 return -EFAULT; 1125 1126 return ret; 1127} 1128#endif 1129 1130char *iwe_stream_add_event(struct iw_request_info *info, char *stream, 1131 char *ends, struct iw_event *iwe, int event_len) 1132{ 1133 int lcp_len = iwe_stream_lcp_len(info); 1134 1135 event_len = iwe_stream_event_len_adjust(info, event_len); 1136 1137 /* Check if it's possible */ 1138 if (likely((stream + event_len) < ends)) { 1139 iwe->len = event_len; 1140 /* Beware of alignement issues on 64 bits */ 1141 memcpy(stream, (char *) iwe, IW_EV_LCP_PK_LEN); 1142 memcpy(stream + lcp_len, &iwe->u, 1143 event_len - lcp_len); 1144 stream += event_len; 1145 } 1146 1147 return stream; 1148} 1149EXPORT_SYMBOL(iwe_stream_add_event); 1150 1151char *iwe_stream_add_point(struct iw_request_info *info, char *stream, 1152 char *ends, struct iw_event *iwe, char *extra) 1153{ 1154 int event_len = iwe_stream_point_len(info) + iwe->u.data.length; 1155 int point_len = iwe_stream_point_len(info); 1156 int lcp_len = iwe_stream_lcp_len(info); 1157 1158 /* Check if it's possible */ 1159 if (likely((stream + event_len) < ends)) { 1160 iwe->len = event_len; 1161 memcpy(stream, (char *) iwe, IW_EV_LCP_PK_LEN); 1162 memcpy(stream + lcp_len, 1163 ((char *) &iwe->u) + IW_EV_POINT_OFF, 1164 IW_EV_POINT_PK_LEN - IW_EV_LCP_PK_LEN); 1165 if (iwe->u.data.length && extra) 1166 memcpy(stream + point_len, extra, iwe->u.data.length); 1167 stream += event_len; 1168 } 1169 1170 return stream; 1171} 1172EXPORT_SYMBOL(iwe_stream_add_point); 1173 1174char *iwe_stream_add_value(struct iw_request_info *info, char *event, 1175 char *value, char *ends, struct iw_event *iwe, 1176 int event_len) 1177{ 1178 int lcp_len = iwe_stream_lcp_len(info); 1179 1180 /* Don't duplicate LCP */ 1181 event_len -= IW_EV_LCP_LEN; 1182 1183 /* Check if it's possible */ 1184 if (likely((value + event_len) < ends)) { 1185 /* Add new value */ 1186 memcpy(value, &iwe->u, event_len); 1187 value += event_len; 1188 /* Patch LCP */ 1189 iwe->len = value - event; 1190 memcpy(event, (char *) iwe, lcp_len); 1191 } 1192 1193 return value; 1194} 1195EXPORT_SYMBOL(iwe_stream_add_value); 1196