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 err = register_netdevice_notifier(&wext_netdev_notifier); 403 if (err) 404 unregister_pernet_subsys(&wext_pernet_ops); 405 return err; 406 } 407 408 subsys_initcall(wireless_nlevent_init); 409 410 /* Process events generated by the wireless layer or the driver. */ 411 static void wireless_nlevent_process(struct work_struct *work) 412 { 413 rtnl_lock(); 414 wireless_nlevent_flush(); 415 rtnl_unlock(); 416 } 417 418 static DECLARE_WORK(wireless_nlevent_work, wireless_nlevent_process); 419 420 static struct nlmsghdr *rtnetlink_ifinfo_prep(struct net_device *dev, 421 struct sk_buff *skb) 422 { 423 struct ifinfomsg *r; 424 struct nlmsghdr *nlh; 425 426 nlh = nlmsg_put(skb, 0, 0, RTM_NEWLINK, sizeof(*r), 0); 427 if (!nlh) 428 return NULL; 429 430 r = nlmsg_data(nlh); 431 r->ifi_family = AF_UNSPEC; 432 r->__ifi_pad = 0; 433 r->ifi_type = dev->type; 434 r->ifi_index = dev->ifindex; 435 r->ifi_flags = dev_get_flags(dev); 436 r->ifi_change = 0; /* Wireless changes don't affect those flags */ 437 438 if (nla_put_string(skb, IFLA_IFNAME, dev->name)) 439 goto nla_put_failure; 440 441 return nlh; 442 nla_put_failure: 443 nlmsg_cancel(skb, nlh); 444 return NULL; 445 } 446 447 448 /* 449 * Main event dispatcher. Called from other parts and drivers. 450 * Send the event on the appropriate channels. 451 * May be called from interrupt context. 452 */ 453 void wireless_send_event(struct net_device * dev, 454 unsigned int cmd, 455 union iwreq_data * wrqu, 456 const char * extra) 457 { 458 const struct iw_ioctl_description * descr = NULL; 459 int extra_len = 0; 460 struct iw_event *event; /* Mallocated whole event */ 461 int event_len; /* Its size */ 462 int hdr_len; /* Size of the event header */ 463 int wrqu_off = 0; /* Offset in wrqu */ 464 /* Don't "optimise" the following variable, it will crash */ 465 unsigned int cmd_index; /* *MUST* be unsigned */ 466 struct sk_buff *skb; 467 struct nlmsghdr *nlh; 468 struct nlattr *nla; 469 #ifdef CONFIG_COMPAT 470 struct __compat_iw_event *compat_event; 471 struct compat_iw_point compat_wrqu; 472 struct sk_buff *compskb; 473 #endif 474 475 /* 476 * Nothing in the kernel sends scan events with data, be safe. 477 * This is necessary because we cannot fix up scan event data 478 * for compat, due to being contained in 'extra', but normally 479 * applications are required to retrieve the scan data anyway 480 * and no data is included in the event, this codifies that 481 * practice. 482 */ 483 if (WARN_ON(cmd == SIOCGIWSCAN && extra)) 484 extra = NULL; 485 486 /* Get the description of the Event */ 487 if (cmd <= SIOCIWLAST) { 488 cmd_index = IW_IOCTL_IDX(cmd); 489 if (cmd_index < standard_ioctl_num) 490 descr = &(standard_ioctl[cmd_index]); 491 } else { 492 cmd_index = IW_EVENT_IDX(cmd); 493 if (cmd_index < standard_event_num) 494 descr = &(standard_event[cmd_index]); 495 } 496 /* Don't accept unknown events */ 497 if (descr == NULL) { 498 /* Note : we don't return an error to the driver, because 499 * the driver would not know what to do about it. It can't 500 * return an error to the user, because the event is not 501 * initiated by a user request. 502 * The best the driver could do is to log an error message. 503 * We will do it ourselves instead... 504 */ 505 netdev_err(dev, "(WE) : Invalid/Unknown Wireless Event (0x%04X)\n", 506 cmd); 507 return; 508 } 509 510 /* Check extra parameters and set extra_len */ 511 if (descr->header_type == IW_HEADER_TYPE_POINT) { 512 /* Check if number of token fits within bounds */ 513 if (wrqu->data.length > descr->max_tokens) { 514 netdev_err(dev, "(WE) : Wireless Event (cmd=0x%04X) too big (%d)\n", 515 cmd, wrqu->data.length); 516 return; 517 } 518 if (wrqu->data.length < descr->min_tokens) { 519 netdev_err(dev, "(WE) : Wireless Event (cmd=0x%04X) too small (%d)\n", 520 cmd, wrqu->data.length); 521 return; 522 } 523 /* Calculate extra_len - extra is NULL for restricted events */ 524 if (extra != NULL) 525 extra_len = wrqu->data.length * descr->token_size; 526 /* Always at an offset in wrqu */ 527 wrqu_off = IW_EV_POINT_OFF; 528 } 529 530 /* Total length of the event */ 531 hdr_len = event_type_size[descr->header_type]; 532 event_len = hdr_len + extra_len; 533 534 /* 535 * The problem for 64/32 bit. 536 * 537 * On 64-bit, a regular event is laid out as follows: 538 * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 539 * | event.len | event.cmd | p a d d i n g | 540 * | wrqu data ... (with the correct size) | 541 * 542 * This padding exists because we manipulate event->u, 543 * and 'event' is not packed. 544 * 545 * An iw_point event is laid out like this instead: 546 * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 547 * | event.len | event.cmd | p a d d i n g | 548 * | iwpnt.len | iwpnt.flg | p a d d i n g | 549 * | extra data ... 550 * 551 * The second padding exists because struct iw_point is extended, 552 * but this depends on the platform... 553 * 554 * On 32-bit, all the padding shouldn't be there. 555 */ 556 557 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 558 if (!skb) 559 return; 560 561 /* Send via the RtNetlink event channel */ 562 nlh = rtnetlink_ifinfo_prep(dev, skb); 563 if (WARN_ON(!nlh)) { 564 kfree_skb(skb); 565 return; 566 } 567 568 /* Add the wireless events in the netlink packet */ 569 nla = nla_reserve(skb, IFLA_WIRELESS, event_len); 570 if (!nla) { 571 kfree_skb(skb); 572 return; 573 } 574 event = nla_data(nla); 575 576 /* Fill event - first clear to avoid data leaking */ 577 memset(event, 0, hdr_len); 578 event->len = event_len; 579 event->cmd = cmd; 580 memcpy(&event->u, ((char *) wrqu) + wrqu_off, hdr_len - IW_EV_LCP_LEN); 581 if (extra_len) 582 memcpy(((char *) event) + hdr_len, extra, extra_len); 583 584 nlmsg_end(skb, nlh); 585 #ifdef CONFIG_COMPAT 586 hdr_len = compat_event_type_size[descr->header_type]; 587 event_len = hdr_len + extra_len; 588 589 compskb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 590 if (!compskb) { 591 kfree_skb(skb); 592 return; 593 } 594 595 /* Send via the RtNetlink event channel */ 596 nlh = rtnetlink_ifinfo_prep(dev, compskb); 597 if (WARN_ON(!nlh)) { 598 kfree_skb(skb); 599 kfree_skb(compskb); 600 return; 601 } 602 603 /* Add the wireless events in the netlink packet */ 604 nla = nla_reserve(compskb, IFLA_WIRELESS, event_len); 605 if (!nla) { 606 kfree_skb(skb); 607 kfree_skb(compskb); 608 return; 609 } 610 compat_event = nla_data(nla); 611 612 compat_event->len = event_len; 613 compat_event->cmd = cmd; 614 if (descr->header_type == IW_HEADER_TYPE_POINT) { 615 compat_wrqu.length = wrqu->data.length; 616 compat_wrqu.flags = wrqu->data.flags; 617 memcpy(&compat_event->pointer, 618 ((char *) &compat_wrqu) + IW_EV_COMPAT_POINT_OFF, 619 hdr_len - IW_EV_COMPAT_LCP_LEN); 620 if (extra_len) 621 memcpy(((char *) compat_event) + hdr_len, 622 extra, extra_len); 623 } else { 624 /* extra_len must be zero, so no if (extra) needed */ 625 memcpy(&compat_event->pointer, wrqu, 626 hdr_len - IW_EV_COMPAT_LCP_LEN); 627 } 628 629 nlmsg_end(compskb, nlh); 630 631 skb_shinfo(skb)->frag_list = compskb; 632 #endif 633 skb_queue_tail(&dev_net(dev)->wext_nlevents, skb); 634 schedule_work(&wireless_nlevent_work); 635 } 636 EXPORT_SYMBOL(wireless_send_event); 637 638 639 640 /* IW handlers */ 641 642 struct iw_statistics *get_wireless_stats(struct net_device *dev) 643 { 644 #ifdef CONFIG_WIRELESS_EXT 645 if ((dev->wireless_handlers != NULL) && 646 (dev->wireless_handlers->get_wireless_stats != NULL)) 647 return dev->wireless_handlers->get_wireless_stats(dev); 648 #endif 649 650 #ifdef CONFIG_CFG80211_WEXT 651 if (dev->ieee80211_ptr && 652 dev->ieee80211_ptr->wiphy && 653 dev->ieee80211_ptr->wiphy->wext && 654 dev->ieee80211_ptr->wiphy->wext->get_wireless_stats) 655 return dev->ieee80211_ptr->wiphy->wext->get_wireless_stats(dev); 656 #endif 657 658 /* not found */ 659 return NULL; 660 } 661 662 static int iw_handler_get_iwstats(struct net_device * dev, 663 struct iw_request_info * info, 664 union iwreq_data * wrqu, 665 char * extra) 666 { 667 /* Get stats from the driver */ 668 struct iw_statistics *stats; 669 670 stats = get_wireless_stats(dev); 671 if (stats) { 672 /* Copy statistics to extra */ 673 memcpy(extra, stats, sizeof(struct iw_statistics)); 674 wrqu->data.length = sizeof(struct iw_statistics); 675 676 /* Check if we need to clear the updated flag */ 677 if (wrqu->data.flags != 0) 678 stats->qual.updated &= ~IW_QUAL_ALL_UPDATED; 679 return 0; 680 } else 681 return -EOPNOTSUPP; 682 } 683 684 static iw_handler get_handler(struct net_device *dev, unsigned int cmd) 685 { 686 /* Don't "optimise" the following variable, it will crash */ 687 unsigned int index; /* *MUST* be unsigned */ 688 const struct iw_handler_def *handlers = NULL; 689 690 #ifdef CONFIG_CFG80211_WEXT 691 if (dev->ieee80211_ptr && dev->ieee80211_ptr->wiphy) 692 handlers = dev->ieee80211_ptr->wiphy->wext; 693 #endif 694 #ifdef CONFIG_WIRELESS_EXT 695 if (dev->wireless_handlers) 696 handlers = dev->wireless_handlers; 697 #endif 698 699 if (!handlers) 700 return NULL; 701 702 /* Try as a standard command */ 703 index = IW_IOCTL_IDX(cmd); 704 if (index < handlers->num_standard) 705 return handlers->standard[index]; 706 707 #ifdef CONFIG_WEXT_PRIV 708 /* Try as a private command */ 709 index = cmd - SIOCIWFIRSTPRIV; 710 if (index < handlers->num_private) 711 return handlers->private[index]; 712 #endif 713 714 /* Not found */ 715 return NULL; 716 } 717 718 static int ioctl_standard_iw_point(struct iw_point *iwp, unsigned int cmd, 719 const struct iw_ioctl_description *descr, 720 iw_handler handler, struct net_device *dev, 721 struct iw_request_info *info) 722 { 723 int err, extra_size, user_length = 0, essid_compat = 0; 724 char *extra; 725 726 /* Calculate space needed by arguments. Always allocate 727 * for max space. 728 */ 729 extra_size = descr->max_tokens * descr->token_size; 730 731 /* Check need for ESSID compatibility for WE < 21 */ 732 switch (cmd) { 733 case SIOCSIWESSID: 734 case SIOCGIWESSID: 735 case SIOCSIWNICKN: 736 case SIOCGIWNICKN: 737 if (iwp->length == descr->max_tokens + 1) 738 essid_compat = 1; 739 else if (IW_IS_SET(cmd) && (iwp->length != 0)) { 740 char essid[IW_ESSID_MAX_SIZE + 1]; 741 unsigned int len; 742 len = iwp->length * descr->token_size; 743 744 if (len > IW_ESSID_MAX_SIZE) 745 return -EFAULT; 746 747 err = copy_from_user(essid, iwp->pointer, len); 748 if (err) 749 return -EFAULT; 750 751 if (essid[iwp->length - 1] == '\0') 752 essid_compat = 1; 753 } 754 break; 755 default: 756 break; 757 } 758 759 iwp->length -= essid_compat; 760 761 /* Check what user space is giving us */ 762 if (IW_IS_SET(cmd)) { 763 /* Check NULL pointer */ 764 if (!iwp->pointer && iwp->length != 0) 765 return -EFAULT; 766 /* Check if number of token fits within bounds */ 767 if (iwp->length > descr->max_tokens) 768 return -E2BIG; 769 if (iwp->length < descr->min_tokens) 770 return -EINVAL; 771 } else { 772 /* Check NULL pointer */ 773 if (!iwp->pointer) 774 return -EFAULT; 775 /* Save user space buffer size for checking */ 776 user_length = iwp->length; 777 778 /* Don't check if user_length > max to allow forward 779 * compatibility. The test user_length < min is 780 * implied by the test at the end. 781 */ 782 783 /* Support for very large requests */ 784 if ((descr->flags & IW_DESCR_FLAG_NOMAX) && 785 (user_length > descr->max_tokens)) { 786 /* Allow userspace to GET more than max so 787 * we can support any size GET requests. 788 * There is still a limit : -ENOMEM. 789 */ 790 extra_size = user_length * descr->token_size; 791 792 /* Note : user_length is originally a __u16, 793 * and token_size is controlled by us, 794 * so extra_size won't get negative and 795 * won't overflow... 796 */ 797 } 798 } 799 800 /* kzalloc() ensures NULL-termination for essid_compat. */ 801 extra = kzalloc(extra_size, GFP_KERNEL); 802 if (!extra) 803 return -ENOMEM; 804 805 /* If it is a SET, get all the extra data in here */ 806 if (IW_IS_SET(cmd) && (iwp->length != 0)) { 807 if (copy_from_user(extra, iwp->pointer, 808 iwp->length * 809 descr->token_size)) { 810 err = -EFAULT; 811 goto out; 812 } 813 814 if (cmd == SIOCSIWENCODEEXT) { 815 struct iw_encode_ext *ee = (void *) extra; 816 817 if (iwp->length < sizeof(*ee) + ee->key_len) { 818 err = -EFAULT; 819 goto out; 820 } 821 } 822 } 823 824 if (IW_IS_GET(cmd) && !(descr->flags & IW_DESCR_FLAG_NOMAX)) { 825 /* 826 * If this is a GET, but not NOMAX, it means that the extra 827 * data is not bounded by userspace, but by max_tokens. Thus 828 * set the length to max_tokens. This matches the extra data 829 * allocation. 830 * The driver should fill it with the number of tokens it 831 * provided, and it may check iwp->length rather than having 832 * knowledge of max_tokens. If the driver doesn't change the 833 * iwp->length, this ioctl just copies back max_token tokens 834 * filled with zeroes. Hopefully the driver isn't claiming 835 * them to be valid data. 836 */ 837 iwp->length = descr->max_tokens; 838 } 839 840 err = handler(dev, info, (union iwreq_data *) iwp, extra); 841 842 iwp->length += essid_compat; 843 844 /* If we have something to return to the user */ 845 if (!err && IW_IS_GET(cmd)) { 846 /* Check if there is enough buffer up there */ 847 if (user_length < iwp->length) { 848 err = -E2BIG; 849 goto out; 850 } 851 852 if (copy_to_user(iwp->pointer, extra, 853 iwp->length * 854 descr->token_size)) { 855 err = -EFAULT; 856 goto out; 857 } 858 } 859 860 /* Generate an event to notify listeners of the change */ 861 if ((descr->flags & IW_DESCR_FLAG_EVENT) && 862 ((err == 0) || (err == -EIWCOMMIT))) { 863 union iwreq_data *data = (union iwreq_data *) iwp; 864 865 if (descr->flags & IW_DESCR_FLAG_RESTRICT) 866 /* If the event is restricted, don't 867 * export the payload. 868 */ 869 wireless_send_event(dev, cmd, data, NULL); 870 else 871 wireless_send_event(dev, cmd, data, extra); 872 } 873 874 out: 875 kfree(extra); 876 return err; 877 } 878 879 /* 880 * Call the commit handler in the driver 881 * (if exist and if conditions are right) 882 * 883 * Note : our current commit strategy is currently pretty dumb, 884 * but we will be able to improve on that... 885 * The goal is to try to agreagate as many changes as possible 886 * before doing the commit. Drivers that will define a commit handler 887 * are usually those that need a reset after changing parameters, so 888 * we want to minimise the number of reset. 889 * A cool idea is to use a timer : at each "set" command, we re-set the 890 * timer, when the timer eventually fires, we call the driver. 891 * Hopefully, more on that later. 892 * 893 * Also, I'm waiting to see how many people will complain about the 894 * netif_running(dev) test. I'm open on that one... 895 * Hopefully, the driver will remember to do a commit in "open()" ;-) 896 */ 897 int call_commit_handler(struct net_device *dev) 898 { 899 #ifdef CONFIG_WIRELESS_EXT 900 if ((netif_running(dev)) && 901 (dev->wireless_handlers->standard[0] != NULL)) 902 /* Call the commit handler on the driver */ 903 return dev->wireless_handlers->standard[0](dev, NULL, 904 NULL, NULL); 905 else 906 return 0; /* Command completed successfully */ 907 #else 908 /* cfg80211 has no commit */ 909 return 0; 910 #endif 911 } 912 913 /* 914 * Main IOCTl dispatcher. 915 * Check the type of IOCTL and call the appropriate wrapper... 916 */ 917 static int wireless_process_ioctl(struct net *net, struct ifreq *ifr, 918 unsigned int cmd, 919 struct iw_request_info *info, 920 wext_ioctl_func standard, 921 wext_ioctl_func private) 922 { 923 struct iwreq *iwr = (struct iwreq *) ifr; 924 struct net_device *dev; 925 iw_handler handler; 926 927 /* Permissions are already checked in dev_ioctl() before calling us. 928 * The copy_to/from_user() of ifr is also dealt with in there */ 929 930 /* Make sure the device exist */ 931 if ((dev = __dev_get_by_name(net, ifr->ifr_name)) == NULL) 932 return -ENODEV; 933 934 /* A bunch of special cases, then the generic case... 935 * Note that 'cmd' is already filtered in dev_ioctl() with 936 * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */ 937 if (cmd == SIOCGIWSTATS) 938 return standard(dev, iwr, cmd, info, 939 &iw_handler_get_iwstats); 940 941 #ifdef CONFIG_WEXT_PRIV 942 if (cmd == SIOCGIWPRIV && dev->wireless_handlers) 943 return standard(dev, iwr, cmd, info, 944 iw_handler_get_private); 945 #endif 946 947 /* Basic check */ 948 if (!netif_device_present(dev)) 949 return -ENODEV; 950 951 /* New driver API : try to find the handler */ 952 handler = get_handler(dev, cmd); 953 if (handler) { 954 /* Standard and private are not the same */ 955 if (cmd < SIOCIWFIRSTPRIV) 956 return standard(dev, iwr, cmd, info, handler); 957 else if (private) 958 return private(dev, iwr, cmd, info, handler); 959 } 960 /* Old driver API : call driver ioctl handler */ 961 if (dev->netdev_ops->ndo_do_ioctl) 962 return dev->netdev_ops->ndo_do_ioctl(dev, ifr, cmd); 963 return -EOPNOTSUPP; 964 } 965 966 /* If command is `set a parameter', or `get the encoding parameters', 967 * check if the user has the right to do it. 968 */ 969 static int wext_permission_check(unsigned int cmd) 970 { 971 if ((IW_IS_SET(cmd) || cmd == SIOCGIWENCODE || 972 cmd == SIOCGIWENCODEEXT) && 973 !capable(CAP_NET_ADMIN)) 974 return -EPERM; 975 976 return 0; 977 } 978 979 /* entry point from dev ioctl */ 980 static int wext_ioctl_dispatch(struct net *net, struct ifreq *ifr, 981 unsigned int cmd, struct iw_request_info *info, 982 wext_ioctl_func standard, 983 wext_ioctl_func private) 984 { 985 int ret = wext_permission_check(cmd); 986 987 if (ret) 988 return ret; 989 990 dev_load(net, ifr->ifr_name); 991 rtnl_lock(); 992 ret = wireless_process_ioctl(net, ifr, cmd, info, standard, private); 993 rtnl_unlock(); 994 995 return ret; 996 } 997 998 /* 999 * Wrapper to call a standard Wireless Extension handler. 1000 * We do various checks and also take care of moving data between 1001 * user space and kernel space. 1002 */ 1003 static int ioctl_standard_call(struct net_device * dev, 1004 struct iwreq *iwr, 1005 unsigned int cmd, 1006 struct iw_request_info *info, 1007 iw_handler handler) 1008 { 1009 const struct iw_ioctl_description * descr; 1010 int ret = -EINVAL; 1011 1012 /* Get the description of the IOCTL */ 1013 if (IW_IOCTL_IDX(cmd) >= standard_ioctl_num) 1014 return -EOPNOTSUPP; 1015 descr = &(standard_ioctl[IW_IOCTL_IDX(cmd)]); 1016 1017 /* Check if we have a pointer to user space data or not */ 1018 if (descr->header_type != IW_HEADER_TYPE_POINT) { 1019 1020 /* No extra arguments. Trivial to handle */ 1021 ret = handler(dev, info, &(iwr->u), NULL); 1022 1023 /* Generate an event to notify listeners of the change */ 1024 if ((descr->flags & IW_DESCR_FLAG_EVENT) && 1025 ((ret == 0) || (ret == -EIWCOMMIT))) 1026 wireless_send_event(dev, cmd, &(iwr->u), NULL); 1027 } else { 1028 ret = ioctl_standard_iw_point(&iwr->u.data, cmd, descr, 1029 handler, dev, info); 1030 } 1031 1032 /* Call commit handler if needed and defined */ 1033 if (ret == -EIWCOMMIT) 1034 ret = call_commit_handler(dev); 1035 1036 /* Here, we will generate the appropriate event if needed */ 1037 1038 return ret; 1039 } 1040 1041 1042 int wext_handle_ioctl(struct net *net, struct ifreq *ifr, unsigned int cmd, 1043 void __user *arg) 1044 { 1045 struct iw_request_info info = { .cmd = cmd, .flags = 0 }; 1046 int ret; 1047 1048 ret = wext_ioctl_dispatch(net, ifr, cmd, &info, 1049 ioctl_standard_call, 1050 ioctl_private_call); 1051 if (ret >= 0 && 1052 IW_IS_GET(cmd) && 1053 copy_to_user(arg, ifr, sizeof(struct iwreq))) 1054 return -EFAULT; 1055 1056 return ret; 1057 } 1058 1059 #ifdef CONFIG_COMPAT 1060 static int compat_standard_call(struct net_device *dev, 1061 struct iwreq *iwr, 1062 unsigned int cmd, 1063 struct iw_request_info *info, 1064 iw_handler handler) 1065 { 1066 const struct iw_ioctl_description *descr; 1067 struct compat_iw_point *iwp_compat; 1068 struct iw_point iwp; 1069 int err; 1070 1071 descr = standard_ioctl + IW_IOCTL_IDX(cmd); 1072 1073 if (descr->header_type != IW_HEADER_TYPE_POINT) 1074 return ioctl_standard_call(dev, iwr, cmd, info, handler); 1075 1076 iwp_compat = (struct compat_iw_point *) &iwr->u.data; 1077 iwp.pointer = compat_ptr(iwp_compat->pointer); 1078 iwp.length = iwp_compat->length; 1079 iwp.flags = iwp_compat->flags; 1080 1081 err = ioctl_standard_iw_point(&iwp, cmd, descr, handler, dev, info); 1082 1083 iwp_compat->pointer = ptr_to_compat(iwp.pointer); 1084 iwp_compat->length = iwp.length; 1085 iwp_compat->flags = iwp.flags; 1086 1087 return err; 1088 } 1089 1090 int compat_wext_handle_ioctl(struct net *net, unsigned int cmd, 1091 unsigned long arg) 1092 { 1093 void __user *argp = (void __user *)arg; 1094 struct iw_request_info info; 1095 struct iwreq iwr; 1096 char *colon; 1097 int ret; 1098 1099 if (copy_from_user(&iwr, argp, sizeof(struct iwreq))) 1100 return -EFAULT; 1101 1102 iwr.ifr_name[IFNAMSIZ-1] = 0; 1103 colon = strchr(iwr.ifr_name, ':'); 1104 if (colon) 1105 *colon = 0; 1106 1107 info.cmd = cmd; 1108 info.flags = IW_REQUEST_FLAG_COMPAT; 1109 1110 ret = wext_ioctl_dispatch(net, (struct ifreq *) &iwr, cmd, &info, 1111 compat_standard_call, 1112 compat_private_call); 1113 1114 if (ret >= 0 && 1115 IW_IS_GET(cmd) && 1116 copy_to_user(argp, &iwr, sizeof(struct iwreq))) 1117 return -EFAULT; 1118 1119 return ret; 1120 } 1121 #endif 1122