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 static 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 } 358 359 static int wext_netdev_notifier_call(struct notifier_block *nb, 360 unsigned long state, void *ptr) 361 { 362 /* 363 * When a netdev changes state in any way, flush all pending messages 364 * to avoid them going out in a strange order, e.g. RTM_NEWLINK after 365 * RTM_DELLINK, or with IFF_UP after without IFF_UP during dev_close() 366 * or similar - all of which could otherwise happen due to delays from 367 * schedule_work(). 368 */ 369 wireless_nlevent_flush(); 370 371 return NOTIFY_OK; 372 } 373 374 static struct notifier_block wext_netdev_notifier = { 375 .notifier_call = wext_netdev_notifier_call, 376 }; 377 378 static int __net_init wext_pernet_init(struct net *net) 379 { 380 skb_queue_head_init(&net->wext_nlevents); 381 return 0; 382 } 383 384 static void __net_exit wext_pernet_exit(struct net *net) 385 { 386 skb_queue_purge(&net->wext_nlevents); 387 } 388 389 static struct pernet_operations wext_pernet_ops = { 390 .init = wext_pernet_init, 391 .exit = wext_pernet_exit, 392 }; 393 394 static int __init wireless_nlevent_init(void) 395 { 396 int err = register_pernet_subsys(&wext_pernet_ops); 397 398 if (err) 399 return err; 400 401 return register_netdevice_notifier(&wext_netdev_notifier); 402 } 403 404 subsys_initcall(wireless_nlevent_init); 405 406 /* Process events generated by the wireless layer or the driver. */ 407 static void wireless_nlevent_process(struct work_struct *work) 408 { 409 rtnl_lock(); 410 wireless_nlevent_flush(); 411 rtnl_unlock(); 412 } 413 414 static DECLARE_WORK(wireless_nlevent_work, wireless_nlevent_process); 415 416 static struct nlmsghdr *rtnetlink_ifinfo_prep(struct net_device *dev, 417 struct sk_buff *skb) 418 { 419 struct ifinfomsg *r; 420 struct nlmsghdr *nlh; 421 422 nlh = nlmsg_put(skb, 0, 0, RTM_NEWLINK, sizeof(*r), 0); 423 if (!nlh) 424 return NULL; 425 426 r = nlmsg_data(nlh); 427 r->ifi_family = AF_UNSPEC; 428 r->__ifi_pad = 0; 429 r->ifi_type = dev->type; 430 r->ifi_index = dev->ifindex; 431 r->ifi_flags = dev_get_flags(dev); 432 r->ifi_change = 0; /* Wireless changes don't affect those flags */ 433 434 if (nla_put_string(skb, IFLA_IFNAME, dev->name)) 435 goto nla_put_failure; 436 437 return nlh; 438 nla_put_failure: 439 nlmsg_cancel(skb, nlh); 440 return NULL; 441 } 442 443 444 /* 445 * Main event dispatcher. Called from other parts and drivers. 446 * Send the event on the appropriate channels. 447 * May be called from interrupt context. 448 */ 449 void wireless_send_event(struct net_device * dev, 450 unsigned int cmd, 451 union iwreq_data * wrqu, 452 const char * extra) 453 { 454 const struct iw_ioctl_description * descr = NULL; 455 int extra_len = 0; 456 struct iw_event *event; /* Mallocated whole event */ 457 int event_len; /* Its size */ 458 int hdr_len; /* Size of the event header */ 459 int wrqu_off = 0; /* Offset in wrqu */ 460 /* Don't "optimise" the following variable, it will crash */ 461 unsigned int cmd_index; /* *MUST* be unsigned */ 462 struct sk_buff *skb; 463 struct nlmsghdr *nlh; 464 struct nlattr *nla; 465 #ifdef CONFIG_COMPAT 466 struct __compat_iw_event *compat_event; 467 struct compat_iw_point compat_wrqu; 468 struct sk_buff *compskb; 469 #endif 470 471 /* 472 * Nothing in the kernel sends scan events with data, be safe. 473 * This is necessary because we cannot fix up scan event data 474 * for compat, due to being contained in 'extra', but normally 475 * applications are required to retrieve the scan data anyway 476 * and no data is included in the event, this codifies that 477 * practice. 478 */ 479 if (WARN_ON(cmd == SIOCGIWSCAN && extra)) 480 extra = NULL; 481 482 /* Get the description of the Event */ 483 if (cmd <= SIOCIWLAST) { 484 cmd_index = IW_IOCTL_IDX(cmd); 485 if (cmd_index < standard_ioctl_num) 486 descr = &(standard_ioctl[cmd_index]); 487 } else { 488 cmd_index = IW_EVENT_IDX(cmd); 489 if (cmd_index < standard_event_num) 490 descr = &(standard_event[cmd_index]); 491 } 492 /* Don't accept unknown events */ 493 if (descr == NULL) { 494 /* Note : we don't return an error to the driver, because 495 * the driver would not know what to do about it. It can't 496 * return an error to the user, because the event is not 497 * initiated by a user request. 498 * The best the driver could do is to log an error message. 499 * We will do it ourselves instead... 500 */ 501 netdev_err(dev, "(WE) : Invalid/Unknown Wireless Event (0x%04X)\n", 502 cmd); 503 return; 504 } 505 506 /* Check extra parameters and set extra_len */ 507 if (descr->header_type == IW_HEADER_TYPE_POINT) { 508 /* Check if number of token fits within bounds */ 509 if (wrqu->data.length > descr->max_tokens) { 510 netdev_err(dev, "(WE) : Wireless Event (cmd=0x%04X) too big (%d)\n", 511 cmd, wrqu->data.length); 512 return; 513 } 514 if (wrqu->data.length < descr->min_tokens) { 515 netdev_err(dev, "(WE) : Wireless Event (cmd=0x%04X) too small (%d)\n", 516 cmd, wrqu->data.length); 517 return; 518 } 519 /* Calculate extra_len - extra is NULL for restricted events */ 520 if (extra != NULL) 521 extra_len = wrqu->data.length * descr->token_size; 522 /* Always at an offset in wrqu */ 523 wrqu_off = IW_EV_POINT_OFF; 524 } 525 526 /* Total length of the event */ 527 hdr_len = event_type_size[descr->header_type]; 528 event_len = hdr_len + extra_len; 529 530 /* 531 * The problem for 64/32 bit. 532 * 533 * On 64-bit, a regular event is laid out as follows: 534 * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 535 * | event.len | event.cmd | p a d d i n g | 536 * | wrqu data ... (with the correct size) | 537 * 538 * This padding exists because we manipulate event->u, 539 * and 'event' is not packed. 540 * 541 * An iw_point event is laid out like this instead: 542 * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 543 * | event.len | event.cmd | p a d d i n g | 544 * | iwpnt.len | iwpnt.flg | p a d d i n g | 545 * | extra data ... 546 * 547 * The second padding exists because struct iw_point is extended, 548 * but this depends on the platform... 549 * 550 * On 32-bit, all the padding shouldn't be there. 551 */ 552 553 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 554 if (!skb) 555 return; 556 557 /* Send via the RtNetlink event channel */ 558 nlh = rtnetlink_ifinfo_prep(dev, skb); 559 if (WARN_ON(!nlh)) { 560 kfree_skb(skb); 561 return; 562 } 563 564 /* Add the wireless events in the netlink packet */ 565 nla = nla_reserve(skb, IFLA_WIRELESS, event_len); 566 if (!nla) { 567 kfree_skb(skb); 568 return; 569 } 570 event = nla_data(nla); 571 572 /* Fill event - first clear to avoid data leaking */ 573 memset(event, 0, hdr_len); 574 event->len = event_len; 575 event->cmd = cmd; 576 memcpy(&event->u, ((char *) wrqu) + wrqu_off, hdr_len - IW_EV_LCP_LEN); 577 if (extra_len) 578 memcpy(((char *) event) + hdr_len, extra, extra_len); 579 580 nlmsg_end(skb, nlh); 581 #ifdef CONFIG_COMPAT 582 hdr_len = compat_event_type_size[descr->header_type]; 583 event_len = hdr_len + extra_len; 584 585 compskb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 586 if (!compskb) { 587 kfree_skb(skb); 588 return; 589 } 590 591 /* Send via the RtNetlink event channel */ 592 nlh = rtnetlink_ifinfo_prep(dev, compskb); 593 if (WARN_ON(!nlh)) { 594 kfree_skb(skb); 595 kfree_skb(compskb); 596 return; 597 } 598 599 /* Add the wireless events in the netlink packet */ 600 nla = nla_reserve(compskb, IFLA_WIRELESS, event_len); 601 if (!nla) { 602 kfree_skb(skb); 603 kfree_skb(compskb); 604 return; 605 } 606 compat_event = nla_data(nla); 607 608 compat_event->len = event_len; 609 compat_event->cmd = cmd; 610 if (descr->header_type == IW_HEADER_TYPE_POINT) { 611 compat_wrqu.length = wrqu->data.length; 612 compat_wrqu.flags = wrqu->data.flags; 613 memcpy(&compat_event->pointer, 614 ((char *) &compat_wrqu) + IW_EV_COMPAT_POINT_OFF, 615 hdr_len - IW_EV_COMPAT_LCP_LEN); 616 if (extra_len) 617 memcpy(((char *) compat_event) + hdr_len, 618 extra, extra_len); 619 } else { 620 /* extra_len must be zero, so no if (extra) needed */ 621 memcpy(&compat_event->pointer, wrqu, 622 hdr_len - IW_EV_COMPAT_LCP_LEN); 623 } 624 625 nlmsg_end(compskb, nlh); 626 627 skb_shinfo(skb)->frag_list = compskb; 628 #endif 629 skb_queue_tail(&dev_net(dev)->wext_nlevents, skb); 630 schedule_work(&wireless_nlevent_work); 631 } 632 EXPORT_SYMBOL(wireless_send_event); 633 634 635 636 /* IW handlers */ 637 638 struct iw_statistics *get_wireless_stats(struct net_device *dev) 639 { 640 #ifdef CONFIG_WIRELESS_EXT 641 if ((dev->wireless_handlers != NULL) && 642 (dev->wireless_handlers->get_wireless_stats != NULL)) 643 return dev->wireless_handlers->get_wireless_stats(dev); 644 #endif 645 646 #ifdef CONFIG_CFG80211_WEXT 647 if (dev->ieee80211_ptr && 648 dev->ieee80211_ptr->wiphy && 649 dev->ieee80211_ptr->wiphy->wext && 650 dev->ieee80211_ptr->wiphy->wext->get_wireless_stats) 651 return dev->ieee80211_ptr->wiphy->wext->get_wireless_stats(dev); 652 #endif 653 654 /* not found */ 655 return NULL; 656 } 657 658 static int iw_handler_get_iwstats(struct net_device * dev, 659 struct iw_request_info * info, 660 union iwreq_data * wrqu, 661 char * extra) 662 { 663 /* Get stats from the driver */ 664 struct iw_statistics *stats; 665 666 stats = get_wireless_stats(dev); 667 if (stats) { 668 /* Copy statistics to extra */ 669 memcpy(extra, stats, sizeof(struct iw_statistics)); 670 wrqu->data.length = sizeof(struct iw_statistics); 671 672 /* Check if we need to clear the updated flag */ 673 if (wrqu->data.flags != 0) 674 stats->qual.updated &= ~IW_QUAL_ALL_UPDATED; 675 return 0; 676 } else 677 return -EOPNOTSUPP; 678 } 679 680 static iw_handler get_handler(struct net_device *dev, unsigned int cmd) 681 { 682 /* Don't "optimise" the following variable, it will crash */ 683 unsigned int index; /* *MUST* be unsigned */ 684 const struct iw_handler_def *handlers = NULL; 685 686 #ifdef CONFIG_CFG80211_WEXT 687 if (dev->ieee80211_ptr && dev->ieee80211_ptr->wiphy) 688 handlers = dev->ieee80211_ptr->wiphy->wext; 689 #endif 690 #ifdef CONFIG_WIRELESS_EXT 691 if (dev->wireless_handlers) 692 handlers = dev->wireless_handlers; 693 #endif 694 695 if (!handlers) 696 return NULL; 697 698 /* Try as a standard command */ 699 index = IW_IOCTL_IDX(cmd); 700 if (index < handlers->num_standard) 701 return handlers->standard[index]; 702 703 #ifdef CONFIG_WEXT_PRIV 704 /* Try as a private command */ 705 index = cmd - SIOCIWFIRSTPRIV; 706 if (index < handlers->num_private) 707 return handlers->private[index]; 708 #endif 709 710 /* Not found */ 711 return NULL; 712 } 713 714 static int ioctl_standard_iw_point(struct iw_point *iwp, unsigned int cmd, 715 const struct iw_ioctl_description *descr, 716 iw_handler handler, struct net_device *dev, 717 struct iw_request_info *info) 718 { 719 int err, extra_size, user_length = 0, essid_compat = 0; 720 char *extra; 721 722 /* Calculate space needed by arguments. Always allocate 723 * for max space. 724 */ 725 extra_size = descr->max_tokens * descr->token_size; 726 727 /* Check need for ESSID compatibility for WE < 21 */ 728 switch (cmd) { 729 case SIOCSIWESSID: 730 case SIOCGIWESSID: 731 case SIOCSIWNICKN: 732 case SIOCGIWNICKN: 733 if (iwp->length == descr->max_tokens + 1) 734 essid_compat = 1; 735 else if (IW_IS_SET(cmd) && (iwp->length != 0)) { 736 char essid[IW_ESSID_MAX_SIZE + 1]; 737 unsigned int len; 738 len = iwp->length * descr->token_size; 739 740 if (len > IW_ESSID_MAX_SIZE) 741 return -EFAULT; 742 743 err = copy_from_user(essid, iwp->pointer, len); 744 if (err) 745 return -EFAULT; 746 747 if (essid[iwp->length - 1] == '\0') 748 essid_compat = 1; 749 } 750 break; 751 default: 752 break; 753 } 754 755 iwp->length -= essid_compat; 756 757 /* Check what user space is giving us */ 758 if (IW_IS_SET(cmd)) { 759 /* Check NULL pointer */ 760 if (!iwp->pointer && iwp->length != 0) 761 return -EFAULT; 762 /* Check if number of token fits within bounds */ 763 if (iwp->length > descr->max_tokens) 764 return -E2BIG; 765 if (iwp->length < descr->min_tokens) 766 return -EINVAL; 767 } else { 768 /* Check NULL pointer */ 769 if (!iwp->pointer) 770 return -EFAULT; 771 /* Save user space buffer size for checking */ 772 user_length = iwp->length; 773 774 /* Don't check if user_length > max to allow forward 775 * compatibility. The test user_length < min is 776 * implied by the test at the end. 777 */ 778 779 /* Support for very large requests */ 780 if ((descr->flags & IW_DESCR_FLAG_NOMAX) && 781 (user_length > descr->max_tokens)) { 782 /* Allow userspace to GET more than max so 783 * we can support any size GET requests. 784 * There is still a limit : -ENOMEM. 785 */ 786 extra_size = user_length * descr->token_size; 787 788 /* Note : user_length is originally a __u16, 789 * and token_size is controlled by us, 790 * so extra_size won't get negative and 791 * won't overflow... 792 */ 793 } 794 } 795 796 /* kzalloc() ensures NULL-termination for essid_compat. */ 797 extra = kzalloc(extra_size, GFP_KERNEL); 798 if (!extra) 799 return -ENOMEM; 800 801 /* If it is a SET, get all the extra data in here */ 802 if (IW_IS_SET(cmd) && (iwp->length != 0)) { 803 if (copy_from_user(extra, iwp->pointer, 804 iwp->length * 805 descr->token_size)) { 806 err = -EFAULT; 807 goto out; 808 } 809 810 if (cmd == SIOCSIWENCODEEXT) { 811 struct iw_encode_ext *ee = (void *) extra; 812 813 if (iwp->length < sizeof(*ee) + ee->key_len) { 814 err = -EFAULT; 815 goto out; 816 } 817 } 818 } 819 820 if (IW_IS_GET(cmd) && !(descr->flags & IW_DESCR_FLAG_NOMAX)) { 821 /* 822 * If this is a GET, but not NOMAX, it means that the extra 823 * data is not bounded by userspace, but by max_tokens. Thus 824 * set the length to max_tokens. This matches the extra data 825 * allocation. 826 * The driver should fill it with the number of tokens it 827 * provided, and it may check iwp->length rather than having 828 * knowledge of max_tokens. If the driver doesn't change the 829 * iwp->length, this ioctl just copies back max_token tokens 830 * filled with zeroes. Hopefully the driver isn't claiming 831 * them to be valid data. 832 */ 833 iwp->length = descr->max_tokens; 834 } 835 836 err = handler(dev, info, (union iwreq_data *) iwp, extra); 837 838 iwp->length += essid_compat; 839 840 /* If we have something to return to the user */ 841 if (!err && IW_IS_GET(cmd)) { 842 /* Check if there is enough buffer up there */ 843 if (user_length < iwp->length) { 844 err = -E2BIG; 845 goto out; 846 } 847 848 if (copy_to_user(iwp->pointer, extra, 849 iwp->length * 850 descr->token_size)) { 851 err = -EFAULT; 852 goto out; 853 } 854 } 855 856 /* Generate an event to notify listeners of the change */ 857 if ((descr->flags & IW_DESCR_FLAG_EVENT) && 858 ((err == 0) || (err == -EIWCOMMIT))) { 859 union iwreq_data *data = (union iwreq_data *) iwp; 860 861 if (descr->flags & IW_DESCR_FLAG_RESTRICT) 862 /* If the event is restricted, don't 863 * export the payload. 864 */ 865 wireless_send_event(dev, cmd, data, NULL); 866 else 867 wireless_send_event(dev, cmd, data, extra); 868 } 869 870 out: 871 kfree(extra); 872 return err; 873 } 874 875 /* 876 * Call the commit handler in the driver 877 * (if exist and if conditions are right) 878 * 879 * Note : our current commit strategy is currently pretty dumb, 880 * but we will be able to improve on that... 881 * The goal is to try to agreagate as many changes as possible 882 * before doing the commit. Drivers that will define a commit handler 883 * are usually those that need a reset after changing parameters, so 884 * we want to minimise the number of reset. 885 * A cool idea is to use a timer : at each "set" command, we re-set the 886 * timer, when the timer eventually fires, we call the driver. 887 * Hopefully, more on that later. 888 * 889 * Also, I'm waiting to see how many people will complain about the 890 * netif_running(dev) test. I'm open on that one... 891 * Hopefully, the driver will remember to do a commit in "open()" ;-) 892 */ 893 int call_commit_handler(struct net_device *dev) 894 { 895 #ifdef CONFIG_WIRELESS_EXT 896 if ((netif_running(dev)) && 897 (dev->wireless_handlers->standard[0] != NULL)) 898 /* Call the commit handler on the driver */ 899 return dev->wireless_handlers->standard[0](dev, NULL, 900 NULL, NULL); 901 else 902 return 0; /* Command completed successfully */ 903 #else 904 /* cfg80211 has no commit */ 905 return 0; 906 #endif 907 } 908 909 /* 910 * Main IOCTl dispatcher. 911 * Check the type of IOCTL and call the appropriate wrapper... 912 */ 913 static int wireless_process_ioctl(struct net *net, struct ifreq *ifr, 914 unsigned int cmd, 915 struct iw_request_info *info, 916 wext_ioctl_func standard, 917 wext_ioctl_func private) 918 { 919 struct iwreq *iwr = (struct iwreq *) ifr; 920 struct net_device *dev; 921 iw_handler handler; 922 923 /* Permissions are already checked in dev_ioctl() before calling us. 924 * The copy_to/from_user() of ifr is also dealt with in there */ 925 926 /* Make sure the device exist */ 927 if ((dev = __dev_get_by_name(net, ifr->ifr_name)) == NULL) 928 return -ENODEV; 929 930 /* A bunch of special cases, then the generic case... 931 * Note that 'cmd' is already filtered in dev_ioctl() with 932 * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */ 933 if (cmd == SIOCGIWSTATS) 934 return standard(dev, iwr, cmd, info, 935 &iw_handler_get_iwstats); 936 937 #ifdef CONFIG_WEXT_PRIV 938 if (cmd == SIOCGIWPRIV && dev->wireless_handlers) 939 return standard(dev, iwr, cmd, info, 940 iw_handler_get_private); 941 #endif 942 943 /* Basic check */ 944 if (!netif_device_present(dev)) 945 return -ENODEV; 946 947 /* New driver API : try to find the handler */ 948 handler = get_handler(dev, cmd); 949 if (handler) { 950 /* Standard and private are not the same */ 951 if (cmd < SIOCIWFIRSTPRIV) 952 return standard(dev, iwr, cmd, info, handler); 953 else if (private) 954 return private(dev, iwr, cmd, info, handler); 955 } 956 /* Old driver API : call driver ioctl handler */ 957 if (dev->netdev_ops->ndo_do_ioctl) 958 return dev->netdev_ops->ndo_do_ioctl(dev, ifr, cmd); 959 return -EOPNOTSUPP; 960 } 961 962 /* If command is `set a parameter', or `get the encoding parameters', 963 * check if the user has the right to do it. 964 */ 965 static int wext_permission_check(unsigned int cmd) 966 { 967 if ((IW_IS_SET(cmd) || cmd == SIOCGIWENCODE || 968 cmd == SIOCGIWENCODEEXT) && 969 !capable(CAP_NET_ADMIN)) 970 return -EPERM; 971 972 return 0; 973 } 974 975 /* entry point from dev ioctl */ 976 static int wext_ioctl_dispatch(struct net *net, struct ifreq *ifr, 977 unsigned int cmd, struct iw_request_info *info, 978 wext_ioctl_func standard, 979 wext_ioctl_func private) 980 { 981 int ret = wext_permission_check(cmd); 982 983 if (ret) 984 return ret; 985 986 dev_load(net, ifr->ifr_name); 987 rtnl_lock(); 988 ret = wireless_process_ioctl(net, ifr, cmd, info, standard, private); 989 rtnl_unlock(); 990 991 return ret; 992 } 993 994 /* 995 * Wrapper to call a standard Wireless Extension handler. 996 * We do various checks and also take care of moving data between 997 * user space and kernel space. 998 */ 999 static int ioctl_standard_call(struct net_device * dev, 1000 struct iwreq *iwr, 1001 unsigned int cmd, 1002 struct iw_request_info *info, 1003 iw_handler handler) 1004 { 1005 const struct iw_ioctl_description * descr; 1006 int ret = -EINVAL; 1007 1008 /* Get the description of the IOCTL */ 1009 if (IW_IOCTL_IDX(cmd) >= standard_ioctl_num) 1010 return -EOPNOTSUPP; 1011 descr = &(standard_ioctl[IW_IOCTL_IDX(cmd)]); 1012 1013 /* Check if we have a pointer to user space data or not */ 1014 if (descr->header_type != IW_HEADER_TYPE_POINT) { 1015 1016 /* No extra arguments. Trivial to handle */ 1017 ret = handler(dev, info, &(iwr->u), NULL); 1018 1019 /* Generate an event to notify listeners of the change */ 1020 if ((descr->flags & IW_DESCR_FLAG_EVENT) && 1021 ((ret == 0) || (ret == -EIWCOMMIT))) 1022 wireless_send_event(dev, cmd, &(iwr->u), NULL); 1023 } else { 1024 ret = ioctl_standard_iw_point(&iwr->u.data, cmd, descr, 1025 handler, dev, info); 1026 } 1027 1028 /* Call commit handler if needed and defined */ 1029 if (ret == -EIWCOMMIT) 1030 ret = call_commit_handler(dev); 1031 1032 /* Here, we will generate the appropriate event if needed */ 1033 1034 return ret; 1035 } 1036 1037 1038 int wext_handle_ioctl(struct net *net, struct ifreq *ifr, unsigned int cmd, 1039 void __user *arg) 1040 { 1041 struct iw_request_info info = { .cmd = cmd, .flags = 0 }; 1042 int ret; 1043 1044 ret = wext_ioctl_dispatch(net, ifr, cmd, &info, 1045 ioctl_standard_call, 1046 ioctl_private_call); 1047 if (ret >= 0 && 1048 IW_IS_GET(cmd) && 1049 copy_to_user(arg, ifr, sizeof(struct iwreq))) 1050 return -EFAULT; 1051 1052 return ret; 1053 } 1054 1055 #ifdef CONFIG_COMPAT 1056 static int compat_standard_call(struct net_device *dev, 1057 struct iwreq *iwr, 1058 unsigned int cmd, 1059 struct iw_request_info *info, 1060 iw_handler handler) 1061 { 1062 const struct iw_ioctl_description *descr; 1063 struct compat_iw_point *iwp_compat; 1064 struct iw_point iwp; 1065 int err; 1066 1067 descr = standard_ioctl + IW_IOCTL_IDX(cmd); 1068 1069 if (descr->header_type != IW_HEADER_TYPE_POINT) 1070 return ioctl_standard_call(dev, iwr, cmd, info, handler); 1071 1072 iwp_compat = (struct compat_iw_point *) &iwr->u.data; 1073 iwp.pointer = compat_ptr(iwp_compat->pointer); 1074 iwp.length = iwp_compat->length; 1075 iwp.flags = iwp_compat->flags; 1076 1077 err = ioctl_standard_iw_point(&iwp, cmd, descr, handler, dev, info); 1078 1079 iwp_compat->pointer = ptr_to_compat(iwp.pointer); 1080 iwp_compat->length = iwp.length; 1081 iwp_compat->flags = iwp.flags; 1082 1083 return err; 1084 } 1085 1086 int compat_wext_handle_ioctl(struct net *net, unsigned int cmd, 1087 unsigned long arg) 1088 { 1089 void __user *argp = (void __user *)arg; 1090 struct iw_request_info info; 1091 struct iwreq iwr; 1092 char *colon; 1093 int ret; 1094 1095 if (copy_from_user(&iwr, argp, sizeof(struct iwreq))) 1096 return -EFAULT; 1097 1098 iwr.ifr_name[IFNAMSIZ-1] = 0; 1099 colon = strchr(iwr.ifr_name, ':'); 1100 if (colon) 1101 *colon = 0; 1102 1103 info.cmd = cmd; 1104 info.flags = IW_REQUEST_FLAG_COMPAT; 1105 1106 ret = wext_ioctl_dispatch(net, (struct ifreq *) &iwr, cmd, &info, 1107 compat_standard_call, 1108 compat_private_call); 1109 1110 if (ret >= 0 && 1111 IW_IS_GET(cmd) && 1112 copy_to_user(argp, &iwr, sizeof(struct iwreq))) 1113 return -EFAULT; 1114 1115 return ret; 1116 } 1117 #endif 1118