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 ASSERT_RTNL(); 351 352 for_each_net(net) { 353 while ((skb = skb_dequeue(&net->wext_nlevents))) 354 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, 355 GFP_KERNEL); 356 } 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 return register_netdevice_notifier(&wext_netdev_notifier); 403 } 404 405 subsys_initcall(wireless_nlevent_init); 406 407 /* Process events generated by the wireless layer or the driver. */ 408 static void wireless_nlevent_process(struct work_struct *work) 409 { 410 rtnl_lock(); 411 wireless_nlevent_flush(); 412 rtnl_unlock(); 413 } 414 415 static DECLARE_WORK(wireless_nlevent_work, wireless_nlevent_process); 416 417 static struct nlmsghdr *rtnetlink_ifinfo_prep(struct net_device *dev, 418 struct sk_buff *skb) 419 { 420 struct ifinfomsg *r; 421 struct nlmsghdr *nlh; 422 423 nlh = nlmsg_put(skb, 0, 0, RTM_NEWLINK, sizeof(*r), 0); 424 if (!nlh) 425 return NULL; 426 427 r = nlmsg_data(nlh); 428 r->ifi_family = AF_UNSPEC; 429 r->__ifi_pad = 0; 430 r->ifi_type = dev->type; 431 r->ifi_index = dev->ifindex; 432 r->ifi_flags = dev_get_flags(dev); 433 r->ifi_change = 0; /* Wireless changes don't affect those flags */ 434 435 if (nla_put_string(skb, IFLA_IFNAME, dev->name)) 436 goto nla_put_failure; 437 438 return nlh; 439 nla_put_failure: 440 nlmsg_cancel(skb, nlh); 441 return NULL; 442 } 443 444 445 /* 446 * Main event dispatcher. Called from other parts and drivers. 447 * Send the event on the appropriate channels. 448 * May be called from interrupt context. 449 */ 450 void wireless_send_event(struct net_device * dev, 451 unsigned int cmd, 452 union iwreq_data * wrqu, 453 const char * extra) 454 { 455 const struct iw_ioctl_description * descr = NULL; 456 int extra_len = 0; 457 struct iw_event *event; /* Mallocated whole event */ 458 int event_len; /* Its size */ 459 int hdr_len; /* Size of the event header */ 460 int wrqu_off = 0; /* Offset in wrqu */ 461 /* Don't "optimise" the following variable, it will crash */ 462 unsigned int cmd_index; /* *MUST* be unsigned */ 463 struct sk_buff *skb; 464 struct nlmsghdr *nlh; 465 struct nlattr *nla; 466 #ifdef CONFIG_COMPAT 467 struct __compat_iw_event *compat_event; 468 struct compat_iw_point compat_wrqu; 469 struct sk_buff *compskb; 470 #endif 471 472 /* 473 * Nothing in the kernel sends scan events with data, be safe. 474 * This is necessary because we cannot fix up scan event data 475 * for compat, due to being contained in 'extra', but normally 476 * applications are required to retrieve the scan data anyway 477 * and no data is included in the event, this codifies that 478 * practice. 479 */ 480 if (WARN_ON(cmd == SIOCGIWSCAN && extra)) 481 extra = NULL; 482 483 /* Get the description of the Event */ 484 if (cmd <= SIOCIWLAST) { 485 cmd_index = IW_IOCTL_IDX(cmd); 486 if (cmd_index < standard_ioctl_num) 487 descr = &(standard_ioctl[cmd_index]); 488 } else { 489 cmd_index = IW_EVENT_IDX(cmd); 490 if (cmd_index < standard_event_num) 491 descr = &(standard_event[cmd_index]); 492 } 493 /* Don't accept unknown events */ 494 if (descr == NULL) { 495 /* Note : we don't return an error to the driver, because 496 * the driver would not know what to do about it. It can't 497 * return an error to the user, because the event is not 498 * initiated by a user request. 499 * The best the driver could do is to log an error message. 500 * We will do it ourselves instead... 501 */ 502 netdev_err(dev, "(WE) : Invalid/Unknown Wireless Event (0x%04X)\n", 503 cmd); 504 return; 505 } 506 507 /* Check extra parameters and set extra_len */ 508 if (descr->header_type == IW_HEADER_TYPE_POINT) { 509 /* Check if number of token fits within bounds */ 510 if (wrqu->data.length > descr->max_tokens) { 511 netdev_err(dev, "(WE) : Wireless Event (cmd=0x%04X) too big (%d)\n", 512 cmd, wrqu->data.length); 513 return; 514 } 515 if (wrqu->data.length < descr->min_tokens) { 516 netdev_err(dev, "(WE) : Wireless Event (cmd=0x%04X) too small (%d)\n", 517 cmd, wrqu->data.length); 518 return; 519 } 520 /* Calculate extra_len - extra is NULL for restricted events */ 521 if (extra != NULL) 522 extra_len = wrqu->data.length * descr->token_size; 523 /* Always at an offset in wrqu */ 524 wrqu_off = IW_EV_POINT_OFF; 525 } 526 527 /* Total length of the event */ 528 hdr_len = event_type_size[descr->header_type]; 529 event_len = hdr_len + extra_len; 530 531 /* 532 * The problem for 64/32 bit. 533 * 534 * On 64-bit, a regular event is laid out as follows: 535 * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 536 * | event.len | event.cmd | p a d d i n g | 537 * | wrqu data ... (with the correct size) | 538 * 539 * This padding exists because we manipulate event->u, 540 * and 'event' is not packed. 541 * 542 * An iw_point event is laid out like this instead: 543 * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 544 * | event.len | event.cmd | p a d d i n g | 545 * | iwpnt.len | iwpnt.flg | p a d d i n g | 546 * | extra data ... 547 * 548 * The second padding exists because struct iw_point is extended, 549 * but this depends on the platform... 550 * 551 * On 32-bit, all the padding shouldn't be there. 552 */ 553 554 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 555 if (!skb) 556 return; 557 558 /* Send via the RtNetlink event channel */ 559 nlh = rtnetlink_ifinfo_prep(dev, skb); 560 if (WARN_ON(!nlh)) { 561 kfree_skb(skb); 562 return; 563 } 564 565 /* Add the wireless events in the netlink packet */ 566 nla = nla_reserve(skb, IFLA_WIRELESS, event_len); 567 if (!nla) { 568 kfree_skb(skb); 569 return; 570 } 571 event = nla_data(nla); 572 573 /* Fill event - first clear to avoid data leaking */ 574 memset(event, 0, hdr_len); 575 event->len = event_len; 576 event->cmd = cmd; 577 memcpy(&event->u, ((char *) wrqu) + wrqu_off, hdr_len - IW_EV_LCP_LEN); 578 if (extra_len) 579 memcpy(((char *) event) + hdr_len, extra, extra_len); 580 581 nlmsg_end(skb, nlh); 582 #ifdef CONFIG_COMPAT 583 hdr_len = compat_event_type_size[descr->header_type]; 584 event_len = hdr_len + extra_len; 585 586 compskb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 587 if (!compskb) { 588 kfree_skb(skb); 589 return; 590 } 591 592 /* Send via the RtNetlink event channel */ 593 nlh = rtnetlink_ifinfo_prep(dev, compskb); 594 if (WARN_ON(!nlh)) { 595 kfree_skb(skb); 596 kfree_skb(compskb); 597 return; 598 } 599 600 /* Add the wireless events in the netlink packet */ 601 nla = nla_reserve(compskb, IFLA_WIRELESS, event_len); 602 if (!nla) { 603 kfree_skb(skb); 604 kfree_skb(compskb); 605 return; 606 } 607 compat_event = nla_data(nla); 608 609 compat_event->len = event_len; 610 compat_event->cmd = cmd; 611 if (descr->header_type == IW_HEADER_TYPE_POINT) { 612 compat_wrqu.length = wrqu->data.length; 613 compat_wrqu.flags = wrqu->data.flags; 614 memcpy(&compat_event->pointer, 615 ((char *) &compat_wrqu) + IW_EV_COMPAT_POINT_OFF, 616 hdr_len - IW_EV_COMPAT_LCP_LEN); 617 if (extra_len) 618 memcpy(((char *) compat_event) + hdr_len, 619 extra, extra_len); 620 } else { 621 /* extra_len must be zero, so no if (extra) needed */ 622 memcpy(&compat_event->pointer, wrqu, 623 hdr_len - IW_EV_COMPAT_LCP_LEN); 624 } 625 626 nlmsg_end(compskb, nlh); 627 628 skb_shinfo(skb)->frag_list = compskb; 629 #endif 630 skb_queue_tail(&dev_net(dev)->wext_nlevents, skb); 631 schedule_work(&wireless_nlevent_work); 632 } 633 EXPORT_SYMBOL(wireless_send_event); 634 635 636 637 /* IW handlers */ 638 639 struct iw_statistics *get_wireless_stats(struct net_device *dev) 640 { 641 #ifdef CONFIG_WIRELESS_EXT 642 if ((dev->wireless_handlers != NULL) && 643 (dev->wireless_handlers->get_wireless_stats != NULL)) 644 return dev->wireless_handlers->get_wireless_stats(dev); 645 #endif 646 647 #ifdef CONFIG_CFG80211_WEXT 648 if (dev->ieee80211_ptr && 649 dev->ieee80211_ptr->wiphy && 650 dev->ieee80211_ptr->wiphy->wext && 651 dev->ieee80211_ptr->wiphy->wext->get_wireless_stats) 652 return dev->ieee80211_ptr->wiphy->wext->get_wireless_stats(dev); 653 #endif 654 655 /* not found */ 656 return NULL; 657 } 658 659 static int iw_handler_get_iwstats(struct net_device * dev, 660 struct iw_request_info * info, 661 union iwreq_data * wrqu, 662 char * extra) 663 { 664 /* Get stats from the driver */ 665 struct iw_statistics *stats; 666 667 stats = get_wireless_stats(dev); 668 if (stats) { 669 /* Copy statistics to extra */ 670 memcpy(extra, stats, sizeof(struct iw_statistics)); 671 wrqu->data.length = sizeof(struct iw_statistics); 672 673 /* Check if we need to clear the updated flag */ 674 if (wrqu->data.flags != 0) 675 stats->qual.updated &= ~IW_QUAL_ALL_UPDATED; 676 return 0; 677 } else 678 return -EOPNOTSUPP; 679 } 680 681 static iw_handler get_handler(struct net_device *dev, unsigned int cmd) 682 { 683 /* Don't "optimise" the following variable, it will crash */ 684 unsigned int index; /* *MUST* be unsigned */ 685 const struct iw_handler_def *handlers = NULL; 686 687 #ifdef CONFIG_CFG80211_WEXT 688 if (dev->ieee80211_ptr && dev->ieee80211_ptr->wiphy) 689 handlers = dev->ieee80211_ptr->wiphy->wext; 690 #endif 691 #ifdef CONFIG_WIRELESS_EXT 692 if (dev->wireless_handlers) 693 handlers = dev->wireless_handlers; 694 #endif 695 696 if (!handlers) 697 return NULL; 698 699 /* Try as a standard command */ 700 index = IW_IOCTL_IDX(cmd); 701 if (index < handlers->num_standard) 702 return handlers->standard[index]; 703 704 #ifdef CONFIG_WEXT_PRIV 705 /* Try as a private command */ 706 index = cmd - SIOCIWFIRSTPRIV; 707 if (index < handlers->num_private) 708 return handlers->private[index]; 709 #endif 710 711 /* Not found */ 712 return NULL; 713 } 714 715 static int ioctl_standard_iw_point(struct iw_point *iwp, unsigned int cmd, 716 const struct iw_ioctl_description *descr, 717 iw_handler handler, struct net_device *dev, 718 struct iw_request_info *info) 719 { 720 int err, extra_size, user_length = 0, essid_compat = 0; 721 char *extra; 722 723 /* Calculate space needed by arguments. Always allocate 724 * for max space. 725 */ 726 extra_size = descr->max_tokens * descr->token_size; 727 728 /* Check need for ESSID compatibility for WE < 21 */ 729 switch (cmd) { 730 case SIOCSIWESSID: 731 case SIOCGIWESSID: 732 case SIOCSIWNICKN: 733 case SIOCGIWNICKN: 734 if (iwp->length == descr->max_tokens + 1) 735 essid_compat = 1; 736 else if (IW_IS_SET(cmd) && (iwp->length != 0)) { 737 char essid[IW_ESSID_MAX_SIZE + 1]; 738 unsigned int len; 739 len = iwp->length * descr->token_size; 740 741 if (len > IW_ESSID_MAX_SIZE) 742 return -EFAULT; 743 744 err = copy_from_user(essid, iwp->pointer, len); 745 if (err) 746 return -EFAULT; 747 748 if (essid[iwp->length - 1] == '\0') 749 essid_compat = 1; 750 } 751 break; 752 default: 753 break; 754 } 755 756 iwp->length -= essid_compat; 757 758 /* Check what user space is giving us */ 759 if (IW_IS_SET(cmd)) { 760 /* Check NULL pointer */ 761 if (!iwp->pointer && iwp->length != 0) 762 return -EFAULT; 763 /* Check if number of token fits within bounds */ 764 if (iwp->length > descr->max_tokens) 765 return -E2BIG; 766 if (iwp->length < descr->min_tokens) 767 return -EINVAL; 768 } else { 769 /* Check NULL pointer */ 770 if (!iwp->pointer) 771 return -EFAULT; 772 /* Save user space buffer size for checking */ 773 user_length = iwp->length; 774 775 /* Don't check if user_length > max to allow forward 776 * compatibility. The test user_length < min is 777 * implied by the test at the end. 778 */ 779 780 /* Support for very large requests */ 781 if ((descr->flags & IW_DESCR_FLAG_NOMAX) && 782 (user_length > descr->max_tokens)) { 783 /* Allow userspace to GET more than max so 784 * we can support any size GET requests. 785 * There is still a limit : -ENOMEM. 786 */ 787 extra_size = user_length * descr->token_size; 788 789 /* Note : user_length is originally a __u16, 790 * and token_size is controlled by us, 791 * so extra_size won't get negative and 792 * won't overflow... 793 */ 794 } 795 } 796 797 /* kzalloc() ensures NULL-termination for essid_compat. */ 798 extra = kzalloc(extra_size, GFP_KERNEL); 799 if (!extra) 800 return -ENOMEM; 801 802 /* If it is a SET, get all the extra data in here */ 803 if (IW_IS_SET(cmd) && (iwp->length != 0)) { 804 if (copy_from_user(extra, iwp->pointer, 805 iwp->length * 806 descr->token_size)) { 807 err = -EFAULT; 808 goto out; 809 } 810 811 if (cmd == SIOCSIWENCODEEXT) { 812 struct iw_encode_ext *ee = (void *) extra; 813 814 if (iwp->length < sizeof(*ee) + ee->key_len) { 815 err = -EFAULT; 816 goto out; 817 } 818 } 819 } 820 821 if (IW_IS_GET(cmd) && !(descr->flags & IW_DESCR_FLAG_NOMAX)) { 822 /* 823 * If this is a GET, but not NOMAX, it means that the extra 824 * data is not bounded by userspace, but by max_tokens. Thus 825 * set the length to max_tokens. This matches the extra data 826 * allocation. 827 * The driver should fill it with the number of tokens it 828 * provided, and it may check iwp->length rather than having 829 * knowledge of max_tokens. If the driver doesn't change the 830 * iwp->length, this ioctl just copies back max_token tokens 831 * filled with zeroes. Hopefully the driver isn't claiming 832 * them to be valid data. 833 */ 834 iwp->length = descr->max_tokens; 835 } 836 837 err = handler(dev, info, (union iwreq_data *) iwp, extra); 838 839 iwp->length += essid_compat; 840 841 /* If we have something to return to the user */ 842 if (!err && IW_IS_GET(cmd)) { 843 /* Check if there is enough buffer up there */ 844 if (user_length < iwp->length) { 845 err = -E2BIG; 846 goto out; 847 } 848 849 if (copy_to_user(iwp->pointer, extra, 850 iwp->length * 851 descr->token_size)) { 852 err = -EFAULT; 853 goto out; 854 } 855 } 856 857 /* Generate an event to notify listeners of the change */ 858 if ((descr->flags & IW_DESCR_FLAG_EVENT) && 859 ((err == 0) || (err == -EIWCOMMIT))) { 860 union iwreq_data *data = (union iwreq_data *) iwp; 861 862 if (descr->flags & IW_DESCR_FLAG_RESTRICT) 863 /* If the event is restricted, don't 864 * export the payload. 865 */ 866 wireless_send_event(dev, cmd, data, NULL); 867 else 868 wireless_send_event(dev, cmd, data, extra); 869 } 870 871 out: 872 kfree(extra); 873 return err; 874 } 875 876 /* 877 * Call the commit handler in the driver 878 * (if exist and if conditions are right) 879 * 880 * Note : our current commit strategy is currently pretty dumb, 881 * but we will be able to improve on that... 882 * The goal is to try to agreagate as many changes as possible 883 * before doing the commit. Drivers that will define a commit handler 884 * are usually those that need a reset after changing parameters, so 885 * we want to minimise the number of reset. 886 * A cool idea is to use a timer : at each "set" command, we re-set the 887 * timer, when the timer eventually fires, we call the driver. 888 * Hopefully, more on that later. 889 * 890 * Also, I'm waiting to see how many people will complain about the 891 * netif_running(dev) test. I'm open on that one... 892 * Hopefully, the driver will remember to do a commit in "open()" ;-) 893 */ 894 int call_commit_handler(struct net_device *dev) 895 { 896 #ifdef CONFIG_WIRELESS_EXT 897 if ((netif_running(dev)) && 898 (dev->wireless_handlers->standard[0] != NULL)) 899 /* Call the commit handler on the driver */ 900 return dev->wireless_handlers->standard[0](dev, NULL, 901 NULL, NULL); 902 else 903 return 0; /* Command completed successfully */ 904 #else 905 /* cfg80211 has no commit */ 906 return 0; 907 #endif 908 } 909 910 /* 911 * Main IOCTl dispatcher. 912 * Check the type of IOCTL and call the appropriate wrapper... 913 */ 914 static int wireless_process_ioctl(struct net *net, struct ifreq *ifr, 915 unsigned int cmd, 916 struct iw_request_info *info, 917 wext_ioctl_func standard, 918 wext_ioctl_func private) 919 { 920 struct iwreq *iwr = (struct iwreq *) ifr; 921 struct net_device *dev; 922 iw_handler handler; 923 924 /* Permissions are already checked in dev_ioctl() before calling us. 925 * The copy_to/from_user() of ifr is also dealt with in there */ 926 927 /* Make sure the device exist */ 928 if ((dev = __dev_get_by_name(net, ifr->ifr_name)) == NULL) 929 return -ENODEV; 930 931 /* A bunch of special cases, then the generic case... 932 * Note that 'cmd' is already filtered in dev_ioctl() with 933 * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */ 934 if (cmd == SIOCGIWSTATS) 935 return standard(dev, iwr, cmd, info, 936 &iw_handler_get_iwstats); 937 938 #ifdef CONFIG_WEXT_PRIV 939 if (cmd == SIOCGIWPRIV && dev->wireless_handlers) 940 return standard(dev, iwr, cmd, info, 941 iw_handler_get_private); 942 #endif 943 944 /* Basic check */ 945 if (!netif_device_present(dev)) 946 return -ENODEV; 947 948 /* New driver API : try to find the handler */ 949 handler = get_handler(dev, cmd); 950 if (handler) { 951 /* Standard and private are not the same */ 952 if (cmd < SIOCIWFIRSTPRIV) 953 return standard(dev, iwr, cmd, info, handler); 954 else if (private) 955 return private(dev, iwr, cmd, info, handler); 956 } 957 /* Old driver API : call driver ioctl handler */ 958 if (dev->netdev_ops->ndo_do_ioctl) 959 return dev->netdev_ops->ndo_do_ioctl(dev, ifr, cmd); 960 return -EOPNOTSUPP; 961 } 962 963 /* If command is `set a parameter', or `get the encoding parameters', 964 * check if the user has the right to do it. 965 */ 966 static int wext_permission_check(unsigned int cmd) 967 { 968 if ((IW_IS_SET(cmd) || cmd == SIOCGIWENCODE || 969 cmd == SIOCGIWENCODEEXT) && 970 !capable(CAP_NET_ADMIN)) 971 return -EPERM; 972 973 return 0; 974 } 975 976 /* entry point from dev ioctl */ 977 static int wext_ioctl_dispatch(struct net *net, struct ifreq *ifr, 978 unsigned int cmd, struct iw_request_info *info, 979 wext_ioctl_func standard, 980 wext_ioctl_func private) 981 { 982 int ret = wext_permission_check(cmd); 983 984 if (ret) 985 return ret; 986 987 dev_load(net, ifr->ifr_name); 988 rtnl_lock(); 989 ret = wireless_process_ioctl(net, ifr, cmd, info, standard, private); 990 rtnl_unlock(); 991 992 return ret; 993 } 994 995 /* 996 * Wrapper to call a standard Wireless Extension handler. 997 * We do various checks and also take care of moving data between 998 * user space and kernel space. 999 */ 1000 static int ioctl_standard_call(struct net_device * dev, 1001 struct iwreq *iwr, 1002 unsigned int cmd, 1003 struct iw_request_info *info, 1004 iw_handler handler) 1005 { 1006 const struct iw_ioctl_description * descr; 1007 int ret = -EINVAL; 1008 1009 /* Get the description of the IOCTL */ 1010 if (IW_IOCTL_IDX(cmd) >= standard_ioctl_num) 1011 return -EOPNOTSUPP; 1012 descr = &(standard_ioctl[IW_IOCTL_IDX(cmd)]); 1013 1014 /* Check if we have a pointer to user space data or not */ 1015 if (descr->header_type != IW_HEADER_TYPE_POINT) { 1016 1017 /* No extra arguments. Trivial to handle */ 1018 ret = handler(dev, info, &(iwr->u), NULL); 1019 1020 /* Generate an event to notify listeners of the change */ 1021 if ((descr->flags & IW_DESCR_FLAG_EVENT) && 1022 ((ret == 0) || (ret == -EIWCOMMIT))) 1023 wireless_send_event(dev, cmd, &(iwr->u), NULL); 1024 } else { 1025 ret = ioctl_standard_iw_point(&iwr->u.data, cmd, descr, 1026 handler, dev, info); 1027 } 1028 1029 /* Call commit handler if needed and defined */ 1030 if (ret == -EIWCOMMIT) 1031 ret = call_commit_handler(dev); 1032 1033 /* Here, we will generate the appropriate event if needed */ 1034 1035 return ret; 1036 } 1037 1038 1039 int wext_handle_ioctl(struct net *net, struct ifreq *ifr, unsigned int cmd, 1040 void __user *arg) 1041 { 1042 struct iw_request_info info = { .cmd = cmd, .flags = 0 }; 1043 int ret; 1044 1045 ret = wext_ioctl_dispatch(net, ifr, cmd, &info, 1046 ioctl_standard_call, 1047 ioctl_private_call); 1048 if (ret >= 0 && 1049 IW_IS_GET(cmd) && 1050 copy_to_user(arg, ifr, sizeof(struct iwreq))) 1051 return -EFAULT; 1052 1053 return ret; 1054 } 1055 1056 #ifdef CONFIG_COMPAT 1057 static int compat_standard_call(struct net_device *dev, 1058 struct iwreq *iwr, 1059 unsigned int cmd, 1060 struct iw_request_info *info, 1061 iw_handler handler) 1062 { 1063 const struct iw_ioctl_description *descr; 1064 struct compat_iw_point *iwp_compat; 1065 struct iw_point iwp; 1066 int err; 1067 1068 descr = standard_ioctl + IW_IOCTL_IDX(cmd); 1069 1070 if (descr->header_type != IW_HEADER_TYPE_POINT) 1071 return ioctl_standard_call(dev, iwr, cmd, info, handler); 1072 1073 iwp_compat = (struct compat_iw_point *) &iwr->u.data; 1074 iwp.pointer = compat_ptr(iwp_compat->pointer); 1075 iwp.length = iwp_compat->length; 1076 iwp.flags = iwp_compat->flags; 1077 1078 err = ioctl_standard_iw_point(&iwp, cmd, descr, handler, dev, info); 1079 1080 iwp_compat->pointer = ptr_to_compat(iwp.pointer); 1081 iwp_compat->length = iwp.length; 1082 iwp_compat->flags = iwp.flags; 1083 1084 return err; 1085 } 1086 1087 int compat_wext_handle_ioctl(struct net *net, unsigned int cmd, 1088 unsigned long arg) 1089 { 1090 void __user *argp = (void __user *)arg; 1091 struct iw_request_info info; 1092 struct iwreq iwr; 1093 char *colon; 1094 int ret; 1095 1096 if (copy_from_user(&iwr, argp, sizeof(struct iwreq))) 1097 return -EFAULT; 1098 1099 iwr.ifr_name[IFNAMSIZ-1] = 0; 1100 colon = strchr(iwr.ifr_name, ':'); 1101 if (colon) 1102 *colon = 0; 1103 1104 info.cmd = cmd; 1105 info.flags = IW_REQUEST_FLAG_COMPAT; 1106 1107 ret = wext_ioctl_dispatch(net, (struct ifreq *) &iwr, cmd, &info, 1108 compat_standard_call, 1109 compat_private_call); 1110 1111 if (ret >= 0 && 1112 IW_IS_GET(cmd) && 1113 copy_to_user(argp, &iwr, sizeof(struct iwreq))) 1114 return -EFAULT; 1115 1116 return ret; 1117 } 1118 #endif 1119