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 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 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 int __net_init wext_pernet_init(struct net *net) 346 { 347 skb_queue_head_init(&net->wext_nlevents); 348 return 0; 349 } 350 351 static void __net_exit wext_pernet_exit(struct net *net) 352 { 353 skb_queue_purge(&net->wext_nlevents); 354 } 355 356 static struct pernet_operations wext_pernet_ops = { 357 .init = wext_pernet_init, 358 .exit = wext_pernet_exit, 359 }; 360 361 static int __init wireless_nlevent_init(void) 362 { 363 return register_pernet_subsys(&wext_pernet_ops); 364 } 365 366 subsys_initcall(wireless_nlevent_init); 367 368 /* Process events generated by the wireless layer or the driver. */ 369 static void wireless_nlevent_process(struct work_struct *work) 370 { 371 struct sk_buff *skb; 372 struct net *net; 373 374 rtnl_lock(); 375 376 for_each_net(net) { 377 while ((skb = skb_dequeue(&net->wext_nlevents))) 378 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, 379 GFP_KERNEL); 380 } 381 382 rtnl_unlock(); 383 } 384 385 static DECLARE_WORK(wireless_nlevent_work, wireless_nlevent_process); 386 387 static struct nlmsghdr *rtnetlink_ifinfo_prep(struct net_device *dev, 388 struct sk_buff *skb) 389 { 390 struct ifinfomsg *r; 391 struct nlmsghdr *nlh; 392 393 nlh = nlmsg_put(skb, 0, 0, RTM_NEWLINK, sizeof(*r), 0); 394 if (!nlh) 395 return NULL; 396 397 r = nlmsg_data(nlh); 398 r->ifi_family = AF_UNSPEC; 399 r->__ifi_pad = 0; 400 r->ifi_type = dev->type; 401 r->ifi_index = dev->ifindex; 402 r->ifi_flags = dev_get_flags(dev); 403 r->ifi_change = 0; /* Wireless changes don't affect those flags */ 404 405 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 406 407 return nlh; 408 nla_put_failure: 409 nlmsg_cancel(skb, nlh); 410 return NULL; 411 } 412 413 414 /* 415 * Main event dispatcher. Called from other parts and drivers. 416 * Send the event on the appropriate channels. 417 * May be called from interrupt context. 418 */ 419 void wireless_send_event(struct net_device * dev, 420 unsigned int cmd, 421 union iwreq_data * wrqu, 422 const char * extra) 423 { 424 const struct iw_ioctl_description * descr = NULL; 425 int extra_len = 0; 426 struct iw_event *event; /* Mallocated whole event */ 427 int event_len; /* Its size */ 428 int hdr_len; /* Size of the event header */ 429 int wrqu_off = 0; /* Offset in wrqu */ 430 /* Don't "optimise" the following variable, it will crash */ 431 unsigned cmd_index; /* *MUST* be unsigned */ 432 struct sk_buff *skb; 433 struct nlmsghdr *nlh; 434 struct nlattr *nla; 435 #ifdef CONFIG_COMPAT 436 struct __compat_iw_event *compat_event; 437 struct compat_iw_point compat_wrqu; 438 struct sk_buff *compskb; 439 #endif 440 441 /* 442 * Nothing in the kernel sends scan events with data, be safe. 443 * This is necessary because we cannot fix up scan event data 444 * for compat, due to being contained in 'extra', but normally 445 * applications are required to retrieve the scan data anyway 446 * and no data is included in the event, this codifies that 447 * practice. 448 */ 449 if (WARN_ON(cmd == SIOCGIWSCAN && extra)) 450 extra = NULL; 451 452 /* Get the description of the Event */ 453 if (cmd <= SIOCIWLAST) { 454 cmd_index = IW_IOCTL_IDX(cmd); 455 if (cmd_index < standard_ioctl_num) 456 descr = &(standard_ioctl[cmd_index]); 457 } else { 458 cmd_index = IW_EVENT_IDX(cmd); 459 if (cmd_index < standard_event_num) 460 descr = &(standard_event[cmd_index]); 461 } 462 /* Don't accept unknown events */ 463 if (descr == NULL) { 464 /* Note : we don't return an error to the driver, because 465 * the driver would not know what to do about it. It can't 466 * return an error to the user, because the event is not 467 * initiated by a user request. 468 * The best the driver could do is to log an error message. 469 * We will do it ourselves instead... 470 */ 471 netdev_err(dev, "(WE) : Invalid/Unknown Wireless Event (0x%04X)\n", 472 cmd); 473 return; 474 } 475 476 /* Check extra parameters and set extra_len */ 477 if (descr->header_type == IW_HEADER_TYPE_POINT) { 478 /* Check if number of token fits within bounds */ 479 if (wrqu->data.length > descr->max_tokens) { 480 netdev_err(dev, "(WE) : Wireless Event too big (%d)\n", 481 wrqu->data.length); 482 return; 483 } 484 if (wrqu->data.length < descr->min_tokens) { 485 netdev_err(dev, "(WE) : Wireless Event too small (%d)\n", 486 wrqu->data.length); 487 return; 488 } 489 /* Calculate extra_len - extra is NULL for restricted events */ 490 if (extra != NULL) 491 extra_len = wrqu->data.length * descr->token_size; 492 /* Always at an offset in wrqu */ 493 wrqu_off = IW_EV_POINT_OFF; 494 } 495 496 /* Total length of the event */ 497 hdr_len = event_type_size[descr->header_type]; 498 event_len = hdr_len + extra_len; 499 500 /* 501 * The problem for 64/32 bit. 502 * 503 * On 64-bit, a regular event is laid out as follows: 504 * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 505 * | event.len | event.cmd | p a d d i n g | 506 * | wrqu data ... (with the correct size) | 507 * 508 * This padding exists because we manipulate event->u, 509 * and 'event' is not packed. 510 * 511 * An iw_point event is laid out like this instead: 512 * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 513 * | event.len | event.cmd | p a d d i n g | 514 * | iwpnt.len | iwpnt.flg | p a d d i n g | 515 * | extra data ... 516 * 517 * The second padding exists because struct iw_point is extended, 518 * but this depends on the platform... 519 * 520 * On 32-bit, all the padding shouldn't be there. 521 */ 522 523 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 524 if (!skb) 525 return; 526 527 /* Send via the RtNetlink event channel */ 528 nlh = rtnetlink_ifinfo_prep(dev, skb); 529 if (WARN_ON(!nlh)) { 530 kfree_skb(skb); 531 return; 532 } 533 534 /* Add the wireless events in the netlink packet */ 535 nla = nla_reserve(skb, IFLA_WIRELESS, event_len); 536 if (!nla) { 537 kfree_skb(skb); 538 return; 539 } 540 event = nla_data(nla); 541 542 /* Fill event - first clear to avoid data leaking */ 543 memset(event, 0, hdr_len); 544 event->len = event_len; 545 event->cmd = cmd; 546 memcpy(&event->u, ((char *) wrqu) + wrqu_off, hdr_len - IW_EV_LCP_LEN); 547 if (extra_len) 548 memcpy(((char *) event) + hdr_len, extra, extra_len); 549 550 nlmsg_end(skb, nlh); 551 #ifdef CONFIG_COMPAT 552 hdr_len = compat_event_type_size[descr->header_type]; 553 event_len = hdr_len + extra_len; 554 555 compskb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); 556 if (!compskb) { 557 kfree_skb(skb); 558 return; 559 } 560 561 /* Send via the RtNetlink event channel */ 562 nlh = rtnetlink_ifinfo_prep(dev, compskb); 563 if (WARN_ON(!nlh)) { 564 kfree_skb(skb); 565 kfree_skb(compskb); 566 return; 567 } 568 569 /* Add the wireless events in the netlink packet */ 570 nla = nla_reserve(compskb, IFLA_WIRELESS, event_len); 571 if (!nla) { 572 kfree_skb(skb); 573 kfree_skb(compskb); 574 return; 575 } 576 compat_event = nla_data(nla); 577 578 compat_event->len = event_len; 579 compat_event->cmd = cmd; 580 if (descr->header_type == IW_HEADER_TYPE_POINT) { 581 compat_wrqu.length = wrqu->data.length; 582 compat_wrqu.flags = wrqu->data.flags; 583 memcpy(&compat_event->pointer, 584 ((char *) &compat_wrqu) + IW_EV_COMPAT_POINT_OFF, 585 hdr_len - IW_EV_COMPAT_LCP_LEN); 586 if (extra_len) 587 memcpy(((char *) compat_event) + hdr_len, 588 extra, extra_len); 589 } else { 590 /* extra_len must be zero, so no if (extra) needed */ 591 memcpy(&compat_event->pointer, wrqu, 592 hdr_len - IW_EV_COMPAT_LCP_LEN); 593 } 594 595 nlmsg_end(compskb, nlh); 596 597 skb_shinfo(skb)->frag_list = compskb; 598 #endif 599 skb_queue_tail(&dev_net(dev)->wext_nlevents, skb); 600 schedule_work(&wireless_nlevent_work); 601 } 602 EXPORT_SYMBOL(wireless_send_event); 603 604 605 606 /* IW handlers */ 607 608 struct iw_statistics *get_wireless_stats(struct net_device *dev) 609 { 610 #ifdef CONFIG_WIRELESS_EXT 611 if ((dev->wireless_handlers != NULL) && 612 (dev->wireless_handlers->get_wireless_stats != NULL)) 613 return dev->wireless_handlers->get_wireless_stats(dev); 614 #endif 615 616 #ifdef CONFIG_CFG80211_WEXT 617 if (dev->ieee80211_ptr && 618 dev->ieee80211_ptr->wiphy && 619 dev->ieee80211_ptr->wiphy->wext && 620 dev->ieee80211_ptr->wiphy->wext->get_wireless_stats) 621 return dev->ieee80211_ptr->wiphy->wext->get_wireless_stats(dev); 622 #endif 623 624 /* not found */ 625 return NULL; 626 } 627 628 static int iw_handler_get_iwstats(struct net_device * dev, 629 struct iw_request_info * info, 630 union iwreq_data * wrqu, 631 char * extra) 632 { 633 /* Get stats from the driver */ 634 struct iw_statistics *stats; 635 636 stats = get_wireless_stats(dev); 637 if (stats) { 638 /* Copy statistics to extra */ 639 memcpy(extra, stats, sizeof(struct iw_statistics)); 640 wrqu->data.length = sizeof(struct iw_statistics); 641 642 /* Check if we need to clear the updated flag */ 643 if (wrqu->data.flags != 0) 644 stats->qual.updated &= ~IW_QUAL_ALL_UPDATED; 645 return 0; 646 } else 647 return -EOPNOTSUPP; 648 } 649 650 static iw_handler get_handler(struct net_device *dev, unsigned int cmd) 651 { 652 /* Don't "optimise" the following variable, it will crash */ 653 unsigned int index; /* *MUST* be unsigned */ 654 const struct iw_handler_def *handlers = NULL; 655 656 #ifdef CONFIG_CFG80211_WEXT 657 if (dev->ieee80211_ptr && dev->ieee80211_ptr->wiphy) 658 handlers = dev->ieee80211_ptr->wiphy->wext; 659 #endif 660 #ifdef CONFIG_WIRELESS_EXT 661 if (dev->wireless_handlers) 662 handlers = dev->wireless_handlers; 663 #endif 664 665 if (!handlers) 666 return NULL; 667 668 /* Try as a standard command */ 669 index = IW_IOCTL_IDX(cmd); 670 if (index < handlers->num_standard) 671 return handlers->standard[index]; 672 673 #ifdef CONFIG_WEXT_PRIV 674 /* Try as a private command */ 675 index = cmd - SIOCIWFIRSTPRIV; 676 if (index < handlers->num_private) 677 return handlers->private[index]; 678 #endif 679 680 /* Not found */ 681 return NULL; 682 } 683 684 static int ioctl_standard_iw_point(struct iw_point *iwp, unsigned int cmd, 685 const struct iw_ioctl_description *descr, 686 iw_handler handler, struct net_device *dev, 687 struct iw_request_info *info) 688 { 689 int err, extra_size, user_length = 0, essid_compat = 0; 690 char *extra; 691 692 /* Calculate space needed by arguments. Always allocate 693 * for max space. 694 */ 695 extra_size = descr->max_tokens * descr->token_size; 696 697 /* Check need for ESSID compatibility for WE < 21 */ 698 switch (cmd) { 699 case SIOCSIWESSID: 700 case SIOCGIWESSID: 701 case SIOCSIWNICKN: 702 case SIOCGIWNICKN: 703 if (iwp->length == descr->max_tokens + 1) 704 essid_compat = 1; 705 else if (IW_IS_SET(cmd) && (iwp->length != 0)) { 706 char essid[IW_ESSID_MAX_SIZE + 1]; 707 unsigned int len; 708 len = iwp->length * descr->token_size; 709 710 if (len > IW_ESSID_MAX_SIZE) 711 return -EFAULT; 712 713 err = copy_from_user(essid, iwp->pointer, len); 714 if (err) 715 return -EFAULT; 716 717 if (essid[iwp->length - 1] == '\0') 718 essid_compat = 1; 719 } 720 break; 721 default: 722 break; 723 } 724 725 iwp->length -= essid_compat; 726 727 /* Check what user space is giving us */ 728 if (IW_IS_SET(cmd)) { 729 /* Check NULL pointer */ 730 if (!iwp->pointer && iwp->length != 0) 731 return -EFAULT; 732 /* Check if number of token fits within bounds */ 733 if (iwp->length > descr->max_tokens) 734 return -E2BIG; 735 if (iwp->length < descr->min_tokens) 736 return -EINVAL; 737 } else { 738 /* Check NULL pointer */ 739 if (!iwp->pointer) 740 return -EFAULT; 741 /* Save user space buffer size for checking */ 742 user_length = iwp->length; 743 744 /* Don't check if user_length > max to allow forward 745 * compatibility. The test user_length < min is 746 * implied by the test at the end. 747 */ 748 749 /* Support for very large requests */ 750 if ((descr->flags & IW_DESCR_FLAG_NOMAX) && 751 (user_length > descr->max_tokens)) { 752 /* Allow userspace to GET more than max so 753 * we can support any size GET requests. 754 * There is still a limit : -ENOMEM. 755 */ 756 extra_size = user_length * descr->token_size; 757 758 /* Note : user_length is originally a __u16, 759 * and token_size is controlled by us, 760 * so extra_size won't get negative and 761 * won't overflow... 762 */ 763 } 764 } 765 766 /* kzalloc() ensures NULL-termination for essid_compat. */ 767 extra = kzalloc(extra_size, GFP_KERNEL); 768 if (!extra) 769 return -ENOMEM; 770 771 /* If it is a SET, get all the extra data in here */ 772 if (IW_IS_SET(cmd) && (iwp->length != 0)) { 773 if (copy_from_user(extra, iwp->pointer, 774 iwp->length * 775 descr->token_size)) { 776 err = -EFAULT; 777 goto out; 778 } 779 780 if (cmd == SIOCSIWENCODEEXT) { 781 struct iw_encode_ext *ee = (void *) extra; 782 783 if (iwp->length < sizeof(*ee) + ee->key_len) { 784 err = -EFAULT; 785 goto out; 786 } 787 } 788 } 789 790 if (IW_IS_GET(cmd) && !(descr->flags & IW_DESCR_FLAG_NOMAX)) { 791 /* 792 * If this is a GET, but not NOMAX, it means that the extra 793 * data is not bounded by userspace, but by max_tokens. Thus 794 * set the length to max_tokens. This matches the extra data 795 * allocation. 796 * The driver should fill it with the number of tokens it 797 * provided, and it may check iwp->length rather than having 798 * knowledge of max_tokens. If the driver doesn't change the 799 * iwp->length, this ioctl just copies back max_token tokens 800 * filled with zeroes. Hopefully the driver isn't claiming 801 * them to be valid data. 802 */ 803 iwp->length = descr->max_tokens; 804 } 805 806 err = handler(dev, info, (union iwreq_data *) iwp, extra); 807 808 iwp->length += essid_compat; 809 810 /* If we have something to return to the user */ 811 if (!err && IW_IS_GET(cmd)) { 812 /* Check if there is enough buffer up there */ 813 if (user_length < iwp->length) { 814 err = -E2BIG; 815 goto out; 816 } 817 818 if (copy_to_user(iwp->pointer, extra, 819 iwp->length * 820 descr->token_size)) { 821 err = -EFAULT; 822 goto out; 823 } 824 } 825 826 /* Generate an event to notify listeners of the change */ 827 if ((descr->flags & IW_DESCR_FLAG_EVENT) && 828 ((err == 0) || (err == -EIWCOMMIT))) { 829 union iwreq_data *data = (union iwreq_data *) iwp; 830 831 if (descr->flags & IW_DESCR_FLAG_RESTRICT) 832 /* If the event is restricted, don't 833 * export the payload. 834 */ 835 wireless_send_event(dev, cmd, data, NULL); 836 else 837 wireless_send_event(dev, cmd, data, extra); 838 } 839 840 out: 841 kfree(extra); 842 return err; 843 } 844 845 /* 846 * Call the commit handler in the driver 847 * (if exist and if conditions are right) 848 * 849 * Note : our current commit strategy is currently pretty dumb, 850 * but we will be able to improve on that... 851 * The goal is to try to agreagate as many changes as possible 852 * before doing the commit. Drivers that will define a commit handler 853 * are usually those that need a reset after changing parameters, so 854 * we want to minimise the number of reset. 855 * A cool idea is to use a timer : at each "set" command, we re-set the 856 * timer, when the timer eventually fires, we call the driver. 857 * Hopefully, more on that later. 858 * 859 * Also, I'm waiting to see how many people will complain about the 860 * netif_running(dev) test. I'm open on that one... 861 * Hopefully, the driver will remember to do a commit in "open()" ;-) 862 */ 863 int call_commit_handler(struct net_device *dev) 864 { 865 #ifdef CONFIG_WIRELESS_EXT 866 if ((netif_running(dev)) && 867 (dev->wireless_handlers->standard[0] != NULL)) 868 /* Call the commit handler on the driver */ 869 return dev->wireless_handlers->standard[0](dev, NULL, 870 NULL, NULL); 871 else 872 return 0; /* Command completed successfully */ 873 #else 874 /* cfg80211 has no commit */ 875 return 0; 876 #endif 877 } 878 879 /* 880 * Main IOCTl dispatcher. 881 * Check the type of IOCTL and call the appropriate wrapper... 882 */ 883 static int wireless_process_ioctl(struct net *net, struct ifreq *ifr, 884 unsigned int cmd, 885 struct iw_request_info *info, 886 wext_ioctl_func standard, 887 wext_ioctl_func private) 888 { 889 struct iwreq *iwr = (struct iwreq *) ifr; 890 struct net_device *dev; 891 iw_handler handler; 892 893 /* Permissions are already checked in dev_ioctl() before calling us. 894 * The copy_to/from_user() of ifr is also dealt with in there */ 895 896 /* Make sure the device exist */ 897 if ((dev = __dev_get_by_name(net, ifr->ifr_name)) == NULL) 898 return -ENODEV; 899 900 /* A bunch of special cases, then the generic case... 901 * Note that 'cmd' is already filtered in dev_ioctl() with 902 * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */ 903 if (cmd == SIOCGIWSTATS) 904 return standard(dev, iwr, cmd, info, 905 &iw_handler_get_iwstats); 906 907 #ifdef CONFIG_WEXT_PRIV 908 if (cmd == SIOCGIWPRIV && dev->wireless_handlers) 909 return standard(dev, iwr, cmd, info, 910 iw_handler_get_private); 911 #endif 912 913 /* Basic check */ 914 if (!netif_device_present(dev)) 915 return -ENODEV; 916 917 /* New driver API : try to find the handler */ 918 handler = get_handler(dev, cmd); 919 if (handler) { 920 /* Standard and private are not the same */ 921 if (cmd < SIOCIWFIRSTPRIV) 922 return standard(dev, iwr, cmd, info, handler); 923 else if (private) 924 return private(dev, iwr, cmd, info, handler); 925 } 926 /* Old driver API : call driver ioctl handler */ 927 if (dev->netdev_ops->ndo_do_ioctl) 928 return dev->netdev_ops->ndo_do_ioctl(dev, ifr, cmd); 929 return -EOPNOTSUPP; 930 } 931 932 /* If command is `set a parameter', or `get the encoding parameters', 933 * check if the user has the right to do it. 934 */ 935 static int wext_permission_check(unsigned int cmd) 936 { 937 if ((IW_IS_SET(cmd) || cmd == SIOCGIWENCODE || 938 cmd == SIOCGIWENCODEEXT) && 939 !capable(CAP_NET_ADMIN)) 940 return -EPERM; 941 942 return 0; 943 } 944 945 /* entry point from dev ioctl */ 946 static int wext_ioctl_dispatch(struct net *net, struct ifreq *ifr, 947 unsigned int cmd, struct iw_request_info *info, 948 wext_ioctl_func standard, 949 wext_ioctl_func private) 950 { 951 int ret = wext_permission_check(cmd); 952 953 if (ret) 954 return ret; 955 956 dev_load(net, ifr->ifr_name); 957 rtnl_lock(); 958 ret = wireless_process_ioctl(net, ifr, cmd, info, standard, private); 959 rtnl_unlock(); 960 961 return ret; 962 } 963 964 /* 965 * Wrapper to call a standard Wireless Extension handler. 966 * We do various checks and also take care of moving data between 967 * user space and kernel space. 968 */ 969 static int ioctl_standard_call(struct net_device * dev, 970 struct iwreq *iwr, 971 unsigned int cmd, 972 struct iw_request_info *info, 973 iw_handler handler) 974 { 975 const struct iw_ioctl_description * descr; 976 int ret = -EINVAL; 977 978 /* Get the description of the IOCTL */ 979 if (IW_IOCTL_IDX(cmd) >= standard_ioctl_num) 980 return -EOPNOTSUPP; 981 descr = &(standard_ioctl[IW_IOCTL_IDX(cmd)]); 982 983 /* Check if we have a pointer to user space data or not */ 984 if (descr->header_type != IW_HEADER_TYPE_POINT) { 985 986 /* No extra arguments. Trivial to handle */ 987 ret = handler(dev, info, &(iwr->u), NULL); 988 989 /* Generate an event to notify listeners of the change */ 990 if ((descr->flags & IW_DESCR_FLAG_EVENT) && 991 ((ret == 0) || (ret == -EIWCOMMIT))) 992 wireless_send_event(dev, cmd, &(iwr->u), NULL); 993 } else { 994 ret = ioctl_standard_iw_point(&iwr->u.data, cmd, descr, 995 handler, dev, info); 996 } 997 998 /* Call commit handler if needed and defined */ 999 if (ret == -EIWCOMMIT) 1000 ret = call_commit_handler(dev); 1001 1002 /* Here, we will generate the appropriate event if needed */ 1003 1004 return ret; 1005 } 1006 1007 1008 int wext_handle_ioctl(struct net *net, struct ifreq *ifr, unsigned int cmd, 1009 void __user *arg) 1010 { 1011 struct iw_request_info info = { .cmd = cmd, .flags = 0 }; 1012 int ret; 1013 1014 ret = wext_ioctl_dispatch(net, ifr, cmd, &info, 1015 ioctl_standard_call, 1016 ioctl_private_call); 1017 if (ret >= 0 && 1018 IW_IS_GET(cmd) && 1019 copy_to_user(arg, ifr, sizeof(struct iwreq))) 1020 return -EFAULT; 1021 1022 return ret; 1023 } 1024 1025 #ifdef CONFIG_COMPAT 1026 static int compat_standard_call(struct net_device *dev, 1027 struct iwreq *iwr, 1028 unsigned int cmd, 1029 struct iw_request_info *info, 1030 iw_handler handler) 1031 { 1032 const struct iw_ioctl_description *descr; 1033 struct compat_iw_point *iwp_compat; 1034 struct iw_point iwp; 1035 int err; 1036 1037 descr = standard_ioctl + IW_IOCTL_IDX(cmd); 1038 1039 if (descr->header_type != IW_HEADER_TYPE_POINT) 1040 return ioctl_standard_call(dev, iwr, cmd, info, handler); 1041 1042 iwp_compat = (struct compat_iw_point *) &iwr->u.data; 1043 iwp.pointer = compat_ptr(iwp_compat->pointer); 1044 iwp.length = iwp_compat->length; 1045 iwp.flags = iwp_compat->flags; 1046 1047 err = ioctl_standard_iw_point(&iwp, cmd, descr, handler, dev, info); 1048 1049 iwp_compat->pointer = ptr_to_compat(iwp.pointer); 1050 iwp_compat->length = iwp.length; 1051 iwp_compat->flags = iwp.flags; 1052 1053 return err; 1054 } 1055 1056 int compat_wext_handle_ioctl(struct net *net, unsigned int cmd, 1057 unsigned long arg) 1058 { 1059 void __user *argp = (void __user *)arg; 1060 struct iw_request_info info; 1061 struct iwreq iwr; 1062 char *colon; 1063 int ret; 1064 1065 if (copy_from_user(&iwr, argp, sizeof(struct iwreq))) 1066 return -EFAULT; 1067 1068 iwr.ifr_name[IFNAMSIZ-1] = 0; 1069 colon = strchr(iwr.ifr_name, ':'); 1070 if (colon) 1071 *colon = 0; 1072 1073 info.cmd = cmd; 1074 info.flags = IW_REQUEST_FLAG_COMPAT; 1075 1076 ret = wext_ioctl_dispatch(net, (struct ifreq *) &iwr, cmd, &info, 1077 compat_standard_call, 1078 compat_private_call); 1079 1080 if (ret >= 0 && 1081 IW_IS_GET(cmd) && 1082 copy_to_user(argp, &iwr, sizeof(struct iwreq))) 1083 return -EFAULT; 1084 1085 return ret; 1086 } 1087 #endif 1088