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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Original code based Host AP (software wireless LAN access point) driver4 * for Intersil Prism2/2.5/3 - hostap.o module, common routines5 *6 * Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen7 * <j@w1.fi>8 * Copyright (c) 2002-2003, Jouni Malinen <j@w1.fi>9 * Copyright (c) 2004-2005, Intel Corporation10 */11 12#include <linux/compiler.h>13#include <linux/errno.h>14#include <linux/if_arp.h>15#include <linux/in6.h>16#include <linux/gfp.h>17#include <linux/in.h>18#include <linux/ip.h>19#include <linux/kernel.h>20#include <linux/module.h>21#include <linux/netdevice.h>22#include <linux/proc_fs.h>23#include <linux/skbuff.h>24#include <linux/tcp.h>25#include <linux/types.h>26#include <linux/wireless.h>27#include <linux/etherdevice.h>28#include <linux/uaccess.h>29#include <linux/ctype.h>30 31#include <net/lib80211.h>32 33#include "libipw.h"34 35static void libipw_monitor_rx(struct libipw_device *ieee,36 struct sk_buff *skb,37 struct libipw_rx_stats *rx_stats)38{39 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;40 u16 fc = le16_to_cpu(hdr->frame_control);41 42 skb->dev = ieee->dev;43 skb_reset_mac_header(skb);44 skb_pull(skb, libipw_get_hdrlen(fc));45 skb->pkt_type = PACKET_OTHERHOST;46 skb->protocol = htons(ETH_P_80211_RAW);47 memset(skb->cb, 0, sizeof(skb->cb));48 netif_rx(skb);49}50 51/* Called only as a tasklet (software IRQ) */52static struct libipw_frag_entry *libipw_frag_cache_find(struct53 libipw_device54 *ieee,55 unsigned int seq,56 unsigned int frag,57 u8 * src,58 u8 * dst)59{60 struct libipw_frag_entry *entry;61 int i;62 63 for (i = 0; i < LIBIPW_FRAG_CACHE_LEN; i++) {64 entry = &ieee->frag_cache[i];65 if (entry->skb != NULL &&66 time_after(jiffies, entry->first_frag_time + 2 * HZ)) {67 LIBIPW_DEBUG_FRAG("expiring fragment cache entry "68 "seq=%u last_frag=%u\n",69 entry->seq, entry->last_frag);70 dev_kfree_skb_any(entry->skb);71 entry->skb = NULL;72 }73 74 if (entry->skb != NULL && entry->seq == seq &&75 (entry->last_frag + 1 == frag || frag == -1) &&76 ether_addr_equal(entry->src_addr, src) &&77 ether_addr_equal(entry->dst_addr, dst))78 return entry;79 }80 81 return NULL;82}83 84/* Called only as a tasklet (software IRQ) */85static struct sk_buff *libipw_frag_cache_get(struct libipw_device *ieee,86 struct libipw_hdr_4addr *hdr)87{88 struct sk_buff *skb = NULL;89 u16 sc;90 unsigned int frag, seq;91 struct libipw_frag_entry *entry;92 93 sc = le16_to_cpu(hdr->seq_ctl);94 frag = WLAN_GET_SEQ_FRAG(sc);95 seq = WLAN_GET_SEQ_SEQ(sc);96 97 if (frag == 0) {98 /* Reserve enough space to fit maximum frame length */99 skb = dev_alloc_skb(ieee->dev->mtu +100 sizeof(struct libipw_hdr_4addr) +101 8 /* LLC */ +102 2 /* alignment */ +103 8 /* WEP */ + ETH_ALEN /* WDS */ );104 if (skb == NULL)105 return NULL;106 107 entry = &ieee->frag_cache[ieee->frag_next_idx];108 ieee->frag_next_idx++;109 if (ieee->frag_next_idx >= LIBIPW_FRAG_CACHE_LEN)110 ieee->frag_next_idx = 0;111 112 if (entry->skb != NULL)113 dev_kfree_skb_any(entry->skb);114 115 entry->first_frag_time = jiffies;116 entry->seq = seq;117 entry->last_frag = frag;118 entry->skb = skb;119 memcpy(entry->src_addr, hdr->addr2, ETH_ALEN);120 memcpy(entry->dst_addr, hdr->addr1, ETH_ALEN);121 } else {122 /* received a fragment of a frame for which the head fragment123 * should have already been received */124 entry = libipw_frag_cache_find(ieee, seq, frag, hdr->addr2,125 hdr->addr1);126 if (entry != NULL) {127 entry->last_frag = frag;128 skb = entry->skb;129 }130 }131 132 return skb;133}134 135/* Called only as a tasklet (software IRQ) */136static int libipw_frag_cache_invalidate(struct libipw_device *ieee,137 struct libipw_hdr_4addr *hdr)138{139 u16 sc;140 unsigned int seq;141 struct libipw_frag_entry *entry;142 143 sc = le16_to_cpu(hdr->seq_ctl);144 seq = WLAN_GET_SEQ_SEQ(sc);145 146 entry = libipw_frag_cache_find(ieee, seq, -1, hdr->addr2,147 hdr->addr1);148 149 if (entry == NULL) {150 LIBIPW_DEBUG_FRAG("could not invalidate fragment cache "151 "entry (seq=%u)\n", seq);152 return -1;153 }154 155 entry->skb = NULL;156 return 0;157}158 159#ifdef NOT_YET160/* libipw_rx_frame_mgtmt161 *162 * Responsible for handling management control frames163 *164 * Called by libipw_rx */165static int166libipw_rx_frame_mgmt(struct libipw_device *ieee, struct sk_buff *skb,167 struct libipw_rx_stats *rx_stats, u16 type,168 u16 stype)169{170 if (ieee->iw_mode == IW_MODE_MASTER) {171 printk(KERN_DEBUG "%s: Master mode not yet supported.\n",172 ieee->dev->name);173 return 0;174/*175 hostap_update_sta_ps(ieee, (struct hostap_libipw_hdr_4addr *)176 skb->data);*/177 }178 179 if (ieee->hostapd && type == WLAN_FC_TYPE_MGMT) {180 if (stype == WLAN_FC_STYPE_BEACON &&181 ieee->iw_mode == IW_MODE_MASTER) {182 struct sk_buff *skb2;183 /* Process beacon frames also in kernel driver to184 * update STA(AP) table statistics */185 skb2 = skb_clone(skb, GFP_ATOMIC);186 if (skb2)187 hostap_rx(skb2->dev, skb2, rx_stats);188 }189 190 /* send management frames to the user space daemon for191 * processing */192 ieee->apdevstats.rx_packets++;193 ieee->apdevstats.rx_bytes += skb->len;194 prism2_rx_80211(ieee->apdev, skb, rx_stats, PRISM2_RX_MGMT);195 return 0;196 }197 198 if (ieee->iw_mode == IW_MODE_MASTER) {199 if (type != WLAN_FC_TYPE_MGMT && type != WLAN_FC_TYPE_CTRL) {200 printk(KERN_DEBUG "%s: unknown management frame "201 "(type=0x%02x, stype=0x%02x) dropped\n",202 skb->dev->name, type, stype);203 return -1;204 }205 206 hostap_rx(skb->dev, skb, rx_stats);207 return 0;208 }209 210 printk(KERN_DEBUG "%s: hostap_rx_frame_mgmt: management frame "211 "received in non-Host AP mode\n", skb->dev->name);212 return -1;213}214#endif215 216/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */217/* Ethernet-II snap header (RFC1042 for most EtherTypes) */218static unsigned char libipw_rfc1042_header[] =219 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };220 221/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */222static unsigned char libipw_bridge_tunnel_header[] =223 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };224/* No encapsulation header if EtherType < 0x600 (=length) */225 226/* Called by libipw_rx_frame_decrypt */227static int libipw_is_eapol_frame(struct libipw_device *ieee,228 struct sk_buff *skb)229{230 struct net_device *dev = ieee->dev;231 u16 fc, ethertype;232 struct libipw_hdr_3addr *hdr;233 u8 *pos;234 235 if (skb->len < 24)236 return 0;237 238 hdr = (struct libipw_hdr_3addr *)skb->data;239 fc = le16_to_cpu(hdr->frame_ctl);240 241 /* check that the frame is unicast frame to us */242 if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==243 IEEE80211_FCTL_TODS &&244 ether_addr_equal(hdr->addr1, dev->dev_addr) &&245 ether_addr_equal(hdr->addr3, dev->dev_addr)) {246 /* ToDS frame with own addr BSSID and DA */247 } else if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==248 IEEE80211_FCTL_FROMDS &&249 ether_addr_equal(hdr->addr1, dev->dev_addr)) {250 /* FromDS frame with own addr as DA */251 } else252 return 0;253 254 if (skb->len < 24 + 8)255 return 0;256 257 /* check for port access entity Ethernet type */258 pos = skb->data + 24;259 ethertype = (pos[6] << 8) | pos[7];260 if (ethertype == ETH_P_PAE)261 return 1;262 263 return 0;264}265 266/* Called only as a tasklet (software IRQ), by libipw_rx */267static int268libipw_rx_frame_decrypt(struct libipw_device *ieee, struct sk_buff *skb,269 struct lib80211_crypt_data *crypt)270{271 struct libipw_hdr_3addr *hdr;272 int res, hdrlen;273 274 if (crypt == NULL || crypt->ops->decrypt_mpdu == NULL)275 return 0;276 277 hdr = (struct libipw_hdr_3addr *)skb->data;278 hdrlen = libipw_get_hdrlen(le16_to_cpu(hdr->frame_ctl));279 280 atomic_inc(&crypt->refcnt);281 res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv);282 atomic_dec(&crypt->refcnt);283 if (res < 0) {284 LIBIPW_DEBUG_DROP("decryption failed (SA=%pM) res=%d\n",285 hdr->addr2, res);286 if (res == -2)287 LIBIPW_DEBUG_DROP("Decryption failed ICV "288 "mismatch (key %d)\n",289 skb->data[hdrlen + 3] >> 6);290 ieee->ieee_stats.rx_discards_undecryptable++;291 return -1;292 }293 294 return res;295}296 297/* Called only as a tasklet (software IRQ), by libipw_rx */298static int299libipw_rx_frame_decrypt_msdu(struct libipw_device *ieee,300 struct sk_buff *skb, int keyidx,301 struct lib80211_crypt_data *crypt)302{303 struct libipw_hdr_3addr *hdr;304 int res, hdrlen;305 306 if (crypt == NULL || crypt->ops->decrypt_msdu == NULL)307 return 0;308 309 hdr = (struct libipw_hdr_3addr *)skb->data;310 hdrlen = libipw_get_hdrlen(le16_to_cpu(hdr->frame_ctl));311 312 atomic_inc(&crypt->refcnt);313 res = crypt->ops->decrypt_msdu(skb, keyidx, hdrlen, crypt->priv);314 atomic_dec(&crypt->refcnt);315 if (res < 0) {316 printk(KERN_DEBUG "%s: MSDU decryption/MIC verification failed"317 " (SA=%pM keyidx=%d)\n", ieee->dev->name, hdr->addr2,318 keyidx);319 return -1;320 }321 322 return 0;323}324 325/* All received frames are sent to this function. @skb contains the frame in326 * IEEE 802.11 format, i.e., in the format it was sent over air.327 * This function is called only as a tasklet (software IRQ). */328int libipw_rx(struct libipw_device *ieee, struct sk_buff *skb,329 struct libipw_rx_stats *rx_stats)330{331 struct net_device *dev = ieee->dev;332 struct libipw_hdr_4addr *hdr;333 size_t hdrlen;334 u16 fc, type, stype, sc;335 unsigned int frag;336 u8 *payload;337 u16 ethertype;338#ifdef NOT_YET339 struct net_device *wds = NULL;340 struct sk_buff *skb2 = NULL;341 struct net_device *wds = NULL;342 int frame_authorized = 0;343 int from_assoc_ap = 0;344 void *sta = NULL;345#endif346 u8 dst[ETH_ALEN];347 u8 src[ETH_ALEN];348 struct lib80211_crypt_data *crypt = NULL;349 int keyidx = 0;350 int can_be_decrypted = 0;351 352 hdr = (struct libipw_hdr_4addr *)skb->data;353 if (skb->len < 10) {354 printk(KERN_INFO "%s: SKB length < 10\n", dev->name);355 goto rx_dropped;356 }357 358 fc = le16_to_cpu(hdr->frame_ctl);359 type = WLAN_FC_GET_TYPE(fc);360 stype = WLAN_FC_GET_STYPE(fc);361 sc = le16_to_cpu(hdr->seq_ctl);362 frag = WLAN_GET_SEQ_FRAG(sc);363 hdrlen = libipw_get_hdrlen(fc);364 365 if (skb->len < hdrlen) {366 printk(KERN_INFO "%s: invalid SKB length %d\n",367 dev->name, skb->len);368 goto rx_dropped;369 }370 371 /* Put this code here so that we avoid duplicating it in all372 * Rx paths. - Jean II */373#ifdef CONFIG_WIRELESS_EXT374#ifdef IW_WIRELESS_SPY /* defined in iw_handler.h */375 /* If spy monitoring on */376 if (ieee->spy_data.spy_number > 0) {377 struct iw_quality wstats;378 379 wstats.updated = 0;380 if (rx_stats->mask & LIBIPW_STATMASK_RSSI) {381 wstats.level = rx_stats->signal;382 wstats.updated |= IW_QUAL_LEVEL_UPDATED;383 } else384 wstats.updated |= IW_QUAL_LEVEL_INVALID;385 386 if (rx_stats->mask & LIBIPW_STATMASK_NOISE) {387 wstats.noise = rx_stats->noise;388 wstats.updated |= IW_QUAL_NOISE_UPDATED;389 } else390 wstats.updated |= IW_QUAL_NOISE_INVALID;391 392 if (rx_stats->mask & LIBIPW_STATMASK_SIGNAL) {393 wstats.qual = rx_stats->signal;394 wstats.updated |= IW_QUAL_QUAL_UPDATED;395 } else396 wstats.updated |= IW_QUAL_QUAL_INVALID;397 398 /* Update spy records */399 wireless_spy_update(ieee->dev, hdr->addr2, &wstats);400 }401#endif /* IW_WIRELESS_SPY */402#endif /* CONFIG_WIRELESS_EXT */403 404#ifdef NOT_YET405 hostap_update_rx_stats(local->ap, hdr, rx_stats);406#endif407 408 if (ieee->iw_mode == IW_MODE_MONITOR) {409 dev->stats.rx_packets++;410 dev->stats.rx_bytes += skb->len;411 libipw_monitor_rx(ieee, skb, rx_stats);412 return 1;413 }414 415 can_be_decrypted = (is_multicast_ether_addr(hdr->addr1) ||416 is_broadcast_ether_addr(hdr->addr2)) ?417 ieee->host_mc_decrypt : ieee->host_decrypt;418 419 if (can_be_decrypted) {420 if (skb->len >= hdrlen + 3) {421 /* Top two-bits of byte 3 are the key index */422 keyidx = skb->data[hdrlen + 3] >> 6;423 }424 425 /* ieee->crypt[] is WEP_KEY (4) in length. Given that keyidx426 * is only allowed 2-bits of storage, no value of keyidx can427 * be provided via above code that would result in keyidx428 * being out of range */429 crypt = ieee->crypt_info.crypt[keyidx];430 431#ifdef NOT_YET432 sta = NULL;433 434 /* Use station specific key to override default keys if the435 * receiver address is a unicast address ("individual RA"). If436 * bcrx_sta_key parameter is set, station specific key is used437 * even with broad/multicast targets (this is against IEEE438 * 802.11, but makes it easier to use different keys with439 * stations that do not support WEP key mapping). */440 441 if (is_unicast_ether_addr(hdr->addr1) || local->bcrx_sta_key)442 (void)hostap_handle_sta_crypto(local, hdr, &crypt,443 &sta);444#endif445 446 /* allow NULL decrypt to indicate an station specific override447 * for default encryption */448 if (crypt && (crypt->ops == NULL ||449 crypt->ops->decrypt_mpdu == NULL))450 crypt = NULL;451 452 if (!crypt && (fc & IEEE80211_FCTL_PROTECTED)) {453 /* This seems to be triggered by some (multicast?)454 * frames from other than current BSS, so just drop the455 * frames silently instead of filling system log with456 * these reports. */457 LIBIPW_DEBUG_DROP("Decryption failed (not set)"458 " (SA=%pM)\n", hdr->addr2);459 ieee->ieee_stats.rx_discards_undecryptable++;460 goto rx_dropped;461 }462 }463#ifdef NOT_YET464 if (type != WLAN_FC_TYPE_DATA) {465 if (type == WLAN_FC_TYPE_MGMT && stype == WLAN_FC_STYPE_AUTH &&466 fc & IEEE80211_FCTL_PROTECTED && ieee->host_decrypt &&467 (keyidx = hostap_rx_frame_decrypt(ieee, skb, crypt)) < 0) {468 printk(KERN_DEBUG "%s: failed to decrypt mgmt::auth "469 "from %pM\n", dev->name, hdr->addr2);470 /* TODO: could inform hostapd about this so that it471 * could send auth failure report */472 goto rx_dropped;473 }474 475 if (libipw_rx_frame_mgmt(ieee, skb, rx_stats, type, stype))476 goto rx_dropped;477 else478 goto rx_exit;479 }480#endif481 /* drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.29) */482 if (sc == ieee->prev_seq_ctl)483 goto rx_dropped;484 else485 ieee->prev_seq_ctl = sc;486 487 /* Data frame - extract src/dst addresses */488 if (skb->len < LIBIPW_3ADDR_LEN)489 goto rx_dropped;490 491 switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) {492 case IEEE80211_FCTL_FROMDS:493 memcpy(dst, hdr->addr1, ETH_ALEN);494 memcpy(src, hdr->addr3, ETH_ALEN);495 break;496 case IEEE80211_FCTL_TODS:497 memcpy(dst, hdr->addr3, ETH_ALEN);498 memcpy(src, hdr->addr2, ETH_ALEN);499 break;500 case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS:501 if (skb->len < LIBIPW_4ADDR_LEN)502 goto rx_dropped;503 memcpy(dst, hdr->addr3, ETH_ALEN);504 memcpy(src, hdr->addr4, ETH_ALEN);505 break;506 default:507 memcpy(dst, hdr->addr1, ETH_ALEN);508 memcpy(src, hdr->addr2, ETH_ALEN);509 break;510 }511 512#ifdef NOT_YET513 if (hostap_rx_frame_wds(ieee, hdr, fc, &wds))514 goto rx_dropped;515 if (wds) {516 skb->dev = dev = wds;517 stats = hostap_get_stats(dev);518 }519 520 if (ieee->iw_mode == IW_MODE_MASTER && !wds &&521 (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==522 IEEE80211_FCTL_FROMDS && ieee->stadev &&523 ether_addr_equal(hdr->addr2, ieee->assoc_ap_addr)) {524 /* Frame from BSSID of the AP for which we are a client */525 skb->dev = dev = ieee->stadev;526 stats = hostap_get_stats(dev);527 from_assoc_ap = 1;528 }529#endif530 531#ifdef NOT_YET532 if ((ieee->iw_mode == IW_MODE_MASTER ||533 ieee->iw_mode == IW_MODE_REPEAT) && !from_assoc_ap) {534 switch (hostap_handle_sta_rx(ieee, dev, skb, rx_stats,535 wds != NULL)) {536 case AP_RX_CONTINUE_NOT_AUTHORIZED:537 frame_authorized = 0;538 break;539 case AP_RX_CONTINUE:540 frame_authorized = 1;541 break;542 case AP_RX_DROP:543 goto rx_dropped;544 case AP_RX_EXIT:545 goto rx_exit;546 }547 }548#endif549 550 /* Nullfunc frames may have PS-bit set, so they must be passed to551 * hostap_handle_sta_rx() before being dropped here. */552 553 stype &= ~IEEE80211_STYPE_QOS_DATA;554 555 if (stype != IEEE80211_STYPE_DATA &&556 stype != IEEE80211_STYPE_DATA_CFACK &&557 stype != IEEE80211_STYPE_DATA_CFPOLL &&558 stype != IEEE80211_STYPE_DATA_CFACKPOLL) {559 if (stype != IEEE80211_STYPE_NULLFUNC)560 LIBIPW_DEBUG_DROP("RX: dropped data frame "561 "with no data (type=0x%02x, "562 "subtype=0x%02x, len=%d)\n",563 type, stype, skb->len);564 goto rx_dropped;565 }566 567 /* skb: hdr + (possibly fragmented, possibly encrypted) payload */568 569 if ((fc & IEEE80211_FCTL_PROTECTED) && can_be_decrypted &&570 (keyidx = libipw_rx_frame_decrypt(ieee, skb, crypt)) < 0)571 goto rx_dropped;572 573 hdr = (struct libipw_hdr_4addr *)skb->data;574 575 /* skb: hdr + (possibly fragmented) plaintext payload */576 // PR: FIXME: hostap has additional conditions in the "if" below:577 // ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&578 if ((frag != 0) || (fc & IEEE80211_FCTL_MOREFRAGS)) {579 int flen;580 struct sk_buff *frag_skb = libipw_frag_cache_get(ieee, hdr);581 LIBIPW_DEBUG_FRAG("Rx Fragment received (%u)\n", frag);582 583 if (!frag_skb) {584 LIBIPW_DEBUG(LIBIPW_DL_RX | LIBIPW_DL_FRAG,585 "Rx cannot get skb from fragment "586 "cache (morefrag=%d seq=%u frag=%u)\n",587 (fc & IEEE80211_FCTL_MOREFRAGS) != 0,588 WLAN_GET_SEQ_SEQ(sc), frag);589 goto rx_dropped;590 }591 592 flen = skb->len;593 if (frag != 0)594 flen -= hdrlen;595 596 if (frag_skb->tail + flen > frag_skb->end) {597 printk(KERN_WARNING "%s: host decrypted and "598 "reassembled frame did not fit skb\n",599 dev->name);600 libipw_frag_cache_invalidate(ieee, hdr);601 goto rx_dropped;602 }603 604 if (frag == 0) {605 /* copy first fragment (including full headers) into606 * beginning of the fragment cache skb */607 skb_copy_from_linear_data(skb, skb_put(frag_skb, flen), flen);608 } else {609 /* append frame payload to the end of the fragment610 * cache skb */611 skb_copy_from_linear_data_offset(skb, hdrlen,612 skb_put(frag_skb, flen), flen);613 }614 dev_kfree_skb_any(skb);615 skb = NULL;616 617 if (fc & IEEE80211_FCTL_MOREFRAGS) {618 /* more fragments expected - leave the skb in fragment619 * cache for now; it will be delivered to upper layers620 * after all fragments have been received */621 goto rx_exit;622 }623 624 /* this was the last fragment and the frame will be625 * delivered, so remove skb from fragment cache */626 skb = frag_skb;627 hdr = (struct libipw_hdr_4addr *)skb->data;628 libipw_frag_cache_invalidate(ieee, hdr);629 }630 631 /* skb: hdr + (possible reassembled) full MSDU payload; possibly still632 * encrypted/authenticated */633 if ((fc & IEEE80211_FCTL_PROTECTED) && can_be_decrypted &&634 libipw_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt))635 goto rx_dropped;636 637 hdr = (struct libipw_hdr_4addr *)skb->data;638 if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep) {639 if ( /*ieee->ieee802_1x && */640 libipw_is_eapol_frame(ieee, skb)) {641 /* pass unencrypted EAPOL frames even if encryption is642 * configured */643 } else {644 LIBIPW_DEBUG_DROP("encryption configured, but RX "645 "frame not encrypted (SA=%pM)\n",646 hdr->addr2);647 goto rx_dropped;648 }649 }650 651 if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep &&652 !libipw_is_eapol_frame(ieee, skb)) {653 LIBIPW_DEBUG_DROP("dropped unencrypted RX data "654 "frame from %pM (drop_unencrypted=1)\n",655 hdr->addr2);656 goto rx_dropped;657 }658 659 /* If the frame was decrypted in hardware, we may need to strip off660 * any security data (IV, ICV, etc) that was left behind */661 if (!can_be_decrypted && (fc & IEEE80211_FCTL_PROTECTED) &&662 ieee->host_strip_iv_icv) {663 int trimlen = 0;664 665 /* Top two-bits of byte 3 are the key index */666 if (skb->len >= hdrlen + 3)667 keyidx = skb->data[hdrlen + 3] >> 6;668 669 /* To strip off any security data which appears before the670 * payload, we simply increase hdrlen (as the header gets671 * chopped off immediately below). For the security data which672 * appears after the payload, we use skb_trim. */673 674 switch (ieee->sec.encode_alg[keyidx]) {675 case SEC_ALG_WEP:676 /* 4 byte IV */677 hdrlen += 4;678 /* 4 byte ICV */679 trimlen = 4;680 break;681 case SEC_ALG_TKIP:682 /* 4 byte IV, 4 byte ExtIV */683 hdrlen += 8;684 /* 8 byte MIC, 4 byte ICV */685 trimlen = 12;686 break;687 case SEC_ALG_CCMP:688 /* 8 byte CCMP header */689 hdrlen += 8;690 /* 8 byte MIC */691 trimlen = 8;692 break;693 }694 695 if (skb->len < trimlen)696 goto rx_dropped;697 698 __skb_trim(skb, skb->len - trimlen);699 700 if (skb->len < hdrlen)701 goto rx_dropped;702 }703 704 /* skb: hdr + (possible reassembled) full plaintext payload */705 706 payload = skb->data + hdrlen;707 ethertype = (payload[6] << 8) | payload[7];708 709#ifdef NOT_YET710 /* If IEEE 802.1X is used, check whether the port is authorized to send711 * the received frame. */712 if (ieee->ieee802_1x && ieee->iw_mode == IW_MODE_MASTER) {713 if (ethertype == ETH_P_PAE) {714 printk(KERN_DEBUG "%s: RX: IEEE 802.1X frame\n",715 dev->name);716 if (ieee->hostapd && ieee->apdev) {717 /* Send IEEE 802.1X frames to the user718 * space daemon for processing */719 prism2_rx_80211(ieee->apdev, skb, rx_stats,720 PRISM2_RX_MGMT);721 ieee->apdevstats.rx_packets++;722 ieee->apdevstats.rx_bytes += skb->len;723 goto rx_exit;724 }725 } else if (!frame_authorized) {726 printk(KERN_DEBUG "%s: dropped frame from "727 "unauthorized port (IEEE 802.1X): "728 "ethertype=0x%04x\n", dev->name, ethertype);729 goto rx_dropped;730 }731 }732#endif733 734 /* convert hdr + possible LLC headers into Ethernet header */735 if (skb->len - hdrlen >= 8 &&736 ((memcmp(payload, libipw_rfc1042_header, SNAP_SIZE) == 0 &&737 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||738 memcmp(payload, libipw_bridge_tunnel_header, SNAP_SIZE) == 0)) {739 /* remove RFC1042 or Bridge-Tunnel encapsulation and740 * replace EtherType */741 skb_pull(skb, hdrlen + SNAP_SIZE);742 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);743 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);744 } else {745 __be16 len;746 /* Leave Ethernet header part of hdr and full payload */747 skb_pull(skb, hdrlen);748 len = htons(skb->len);749 memcpy(skb_push(skb, 2), &len, 2);750 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);751 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);752 }753 754#ifdef NOT_YET755 if (wds && ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==756 IEEE80211_FCTL_TODS) && skb->len >= ETH_HLEN + ETH_ALEN) {757 /* Non-standard frame: get addr4 from its bogus location after758 * the payload */759 skb_copy_to_linear_data_offset(skb, ETH_ALEN,760 skb->data + skb->len - ETH_ALEN,761 ETH_ALEN);762 skb_trim(skb, skb->len - ETH_ALEN);763 }764#endif765 766 dev->stats.rx_packets++;767 dev->stats.rx_bytes += skb->len;768 769#ifdef NOT_YET770 if (ieee->iw_mode == IW_MODE_MASTER && !wds && ieee->ap->bridge_packets) {771 if (is_multicast_ether_addr(dst)) {772 /* copy multicast frame both to the higher layers and773 * to the wireless media */774 ieee->ap->bridged_multicast++;775 skb2 = skb_clone(skb, GFP_ATOMIC);776 if (skb2 == NULL)777 printk(KERN_DEBUG "%s: skb_clone failed for "778 "multicast frame\n", dev->name);779 } else if (hostap_is_sta_assoc(ieee->ap, dst)) {780 /* send frame directly to the associated STA using781 * wireless media and not passing to higher layers */782 ieee->ap->bridged_unicast++;783 skb2 = skb;784 skb = NULL;785 }786 }787 788 if (skb2 != NULL) {789 /* send to wireless media */790 skb2->dev = dev;791 skb2->protocol = htons(ETH_P_802_3);792 skb_reset_mac_header(skb2);793 skb_reset_network_header(skb2);794 /* skb2->network_header += ETH_HLEN; */795 dev_queue_xmit(skb2);796 }797#endif798 799 if (skb) {800 skb->protocol = eth_type_trans(skb, dev);801 memset(skb->cb, 0, sizeof(skb->cb));802 skb->ip_summed = CHECKSUM_NONE; /* 802.11 crc not sufficient */803 if (netif_rx(skb) == NET_RX_DROP) {804 /* netif_rx always succeeds, but it might drop805 * the packet. If it drops the packet, we log that806 * in our stats. */807 LIBIPW_DEBUG_DROP808 ("RX: netif_rx dropped the packet\n");809 dev->stats.rx_dropped++;810 }811 }812 813 rx_exit:814#ifdef NOT_YET815 if (sta)816 hostap_handle_sta_release(sta);817#endif818 return 1;819 820 rx_dropped:821 dev->stats.rx_dropped++;822 823 /* Returning 0 indicates to caller that we have not handled the SKB--824 * so it is still allocated and can be used again by underlying825 * hardware as a DMA target */826 return 0;827}828 829/* Filter out unrelated packets, call libipw_rx[_mgt]830 * This function takes over the skb, it should not be used again after calling831 * this function. */832void libipw_rx_any(struct libipw_device *ieee,833 struct sk_buff *skb, struct libipw_rx_stats *stats)834{835 struct libipw_hdr_4addr *hdr;836 int is_packet_for_us;837 u16 fc;838 839 if (ieee->iw_mode == IW_MODE_MONITOR) {840 if (!libipw_rx(ieee, skb, stats))841 dev_kfree_skb_irq(skb);842 return;843 }844 845 if (skb->len < sizeof(struct ieee80211_hdr))846 goto drop_free;847 848 hdr = (struct libipw_hdr_4addr *)skb->data;849 fc = le16_to_cpu(hdr->frame_ctl);850 851 if ((fc & IEEE80211_FCTL_VERS) != 0)852 goto drop_free;853 854 switch (fc & IEEE80211_FCTL_FTYPE) {855 case IEEE80211_FTYPE_MGMT:856 if (skb->len < sizeof(struct libipw_hdr_3addr))857 goto drop_free;858 libipw_rx_mgt(ieee, hdr, stats);859 dev_kfree_skb_irq(skb);860 return;861 case IEEE80211_FTYPE_DATA:862 break;863 case IEEE80211_FTYPE_CTL:864 return;865 default:866 return;867 }868 869 is_packet_for_us = 0;870 switch (ieee->iw_mode) {871 case IW_MODE_ADHOC:872 /* our BSS and not from/to DS */873 if (ether_addr_equal(hdr->addr3, ieee->bssid))874 if ((fc & (IEEE80211_FCTL_TODS+IEEE80211_FCTL_FROMDS)) == 0) {875 /* promisc: get all */876 if (ieee->dev->flags & IFF_PROMISC)877 is_packet_for_us = 1;878 /* to us */879 else if (ether_addr_equal(hdr->addr1, ieee->dev->dev_addr))880 is_packet_for_us = 1;881 /* mcast */882 else if (is_multicast_ether_addr(hdr->addr1))883 is_packet_for_us = 1;884 }885 break;886 case IW_MODE_INFRA:887 /* our BSS (== from our AP) and from DS */888 if (ether_addr_equal(hdr->addr2, ieee->bssid))889 if ((fc & (IEEE80211_FCTL_TODS+IEEE80211_FCTL_FROMDS)) == IEEE80211_FCTL_FROMDS) {890 /* promisc: get all */891 if (ieee->dev->flags & IFF_PROMISC)892 is_packet_for_us = 1;893 /* to us */894 else if (ether_addr_equal(hdr->addr1, ieee->dev->dev_addr))895 is_packet_for_us = 1;896 /* mcast */897 else if (is_multicast_ether_addr(hdr->addr1)) {898 /* not our own packet bcasted from AP */899 if (!ether_addr_equal(hdr->addr3, ieee->dev->dev_addr))900 is_packet_for_us = 1;901 }902 }903 break;904 default:905 /* ? */906 break;907 }908 909 if (is_packet_for_us)910 if (!libipw_rx(ieee, skb, stats))911 dev_kfree_skb_irq(skb);912 return;913 914drop_free:915 dev_kfree_skb_irq(skb);916 ieee->dev->stats.rx_dropped++;917}918 919#define MGMT_FRAME_FIXED_PART_LENGTH 0x24920 921static u8 qos_oui[QOS_OUI_LEN] = { 0x00, 0x50, 0xF2 };922 923/*924* Make the structure we read from the beacon packet to have925* the right values926*/927static int libipw_verify_qos_info(struct libipw_qos_information_element928 *info_element, int sub_type)929{930 if (info_element->elementID != QOS_ELEMENT_ID)931 return -1;932 if (info_element->qui_subtype != sub_type)933 return -1;934 if (memcmp(info_element->qui, qos_oui, QOS_OUI_LEN))935 return -1;936 if (info_element->qui_type != QOS_OUI_TYPE)937 return -1;938 if (info_element->version != QOS_VERSION_1)939 return -1;940 941 return 0;942}943 944/*945 * Parse a QoS parameter element946 */947static int libipw_read_qos_param_element(948 struct libipw_qos_parameter_info *element_param,949 struct libipw_info_element *info_element)950{951 size_t size = sizeof(*element_param);952 953 if (!element_param || !info_element || info_element->len != size - 2)954 return -1;955 956 memcpy(element_param, info_element, size);957 return libipw_verify_qos_info(&element_param->info_element,958 QOS_OUI_PARAM_SUB_TYPE);959}960 961/*962 * Parse a QoS information element963 */964static int libipw_read_qos_info_element(965 struct libipw_qos_information_element *element_info,966 struct libipw_info_element *info_element)967{968 size_t size = sizeof(struct libipw_qos_information_element) - 2;969 970 if (!element_info || !info_element || info_element->len != size - 2)971 return -1;972 973 memcpy(element_info, info_element, size);974 return libipw_verify_qos_info(element_info, QOS_OUI_INFO_SUB_TYPE);975}976 977/*978 * Write QoS parameters from the ac parameters.979 */980static void libipw_qos_convert_ac_to_parameters(struct981 libipw_qos_parameter_info982 *param_elm, struct983 libipw_qos_parameters984 *qos_param)985{986 int i;987 struct libipw_qos_ac_parameter *ac_params;988 u32 txop;989 u8 cw_min;990 u8 cw_max;991 992 for (i = 0; i < QOS_QUEUE_NUM; i++) {993 ac_params = &(param_elm->ac_params_record[i]);994 995 qos_param->aifs[i] = (ac_params->aci_aifsn) & 0x0F;996 qos_param->aifs[i] -= (qos_param->aifs[i] < 2) ? 0 : 2;997 998 cw_min = ac_params->ecw_min_max & 0x0F;999 qos_param->cw_min[i] = cpu_to_le16((1 << cw_min) - 1);1000 1001 cw_max = (ac_params->ecw_min_max & 0xF0) >> 4;1002 qos_param->cw_max[i] = cpu_to_le16((1 << cw_max) - 1);1003 1004 qos_param->flag[i] =1005 (ac_params->aci_aifsn & 0x10) ? 0x01 : 0x00;1006 1007 txop = le16_to_cpu(ac_params->tx_op_limit) * 32;1008 qos_param->tx_op_limit[i] = cpu_to_le16(txop);1009 }1010}1011 1012/*1013 * we have a generic data element which it may contain QoS information or1014 * parameters element. check the information element length to decide1015 * which type to read1016 */1017static int libipw_parse_qos_info_param_IE(struct libipw_info_element1018 *info_element,1019 struct libipw_network *network)1020{1021 int rc = 0;1022 struct libipw_qos_parameters *qos_param = NULL;1023 struct libipw_qos_information_element qos_info_element;1024 1025 rc = libipw_read_qos_info_element(&qos_info_element, info_element);1026 1027 if (rc == 0) {1028 network->qos_data.param_count = qos_info_element.ac_info & 0x0F;1029 network->flags |= NETWORK_HAS_QOS_INFORMATION;1030 } else {1031 struct libipw_qos_parameter_info param_element;1032 1033 rc = libipw_read_qos_param_element(¶m_element,1034 info_element);1035 if (rc == 0) {1036 qos_param = &(network->qos_data.parameters);1037 libipw_qos_convert_ac_to_parameters(¶m_element,1038 qos_param);1039 network->flags |= NETWORK_HAS_QOS_PARAMETERS;1040 network->qos_data.param_count =1041 param_element.info_element.ac_info & 0x0F;1042 }1043 }1044 1045 if (rc == 0) {1046 LIBIPW_DEBUG_QOS("QoS is supported\n");1047 network->qos_data.supported = 1;1048 }1049 return rc;1050}1051 1052#ifdef CONFIG_LIBIPW_DEBUG1053#define MFIE_STRING(x) case WLAN_EID_ ##x: return #x1054 1055static const char *get_info_element_string(u16 id)1056{1057 switch (id) {1058 MFIE_STRING(SSID);1059 MFIE_STRING(SUPP_RATES);1060 MFIE_STRING(FH_PARAMS);1061 MFIE_STRING(DS_PARAMS);1062 MFIE_STRING(CF_PARAMS);1063 MFIE_STRING(TIM);1064 MFIE_STRING(IBSS_PARAMS);1065 MFIE_STRING(COUNTRY);1066 MFIE_STRING(REQUEST);1067 MFIE_STRING(CHALLENGE);1068 MFIE_STRING(PWR_CONSTRAINT);1069 MFIE_STRING(PWR_CAPABILITY);1070 MFIE_STRING(TPC_REQUEST);1071 MFIE_STRING(TPC_REPORT);1072 MFIE_STRING(SUPPORTED_CHANNELS);1073 MFIE_STRING(CHANNEL_SWITCH);1074 MFIE_STRING(MEASURE_REQUEST);1075 MFIE_STRING(MEASURE_REPORT);1076 MFIE_STRING(QUIET);1077 MFIE_STRING(IBSS_DFS);1078 MFIE_STRING(ERP_INFO);1079 MFIE_STRING(RSN);1080 MFIE_STRING(EXT_SUPP_RATES);1081 MFIE_STRING(VENDOR_SPECIFIC);1082 MFIE_STRING(QOS_PARAMETER);1083 default:1084 return "UNKNOWN";1085 }1086}1087#endif1088 1089static int libipw_parse_info_param(struct libipw_info_element1090 *info_element, u16 length,1091 struct libipw_network *network)1092{1093 u8 i;1094#ifdef CONFIG_LIBIPW_DEBUG1095 char rates_str[64];1096 char *p;1097#endif1098 1099 while (length >= sizeof(*info_element)) {1100 if (sizeof(*info_element) + info_element->len > length) {1101 LIBIPW_DEBUG_MGMT("Info elem: parse failed: "1102 "info_element->len + 2 > left : "1103 "info_element->len+2=%zd left=%d, id=%d.\n",1104 info_element->len +1105 sizeof(*info_element),1106 length, info_element->id);1107 /* We stop processing but don't return an error here1108 * because some misbehaviour APs break this rule. ie.1109 * Orinoco AP1000. */1110 break;1111 }1112 1113 switch (info_element->id) {1114 case WLAN_EID_SSID:1115 network->ssid_len = min(info_element->len,1116 (u8) IW_ESSID_MAX_SIZE);1117 memcpy(network->ssid, info_element->data,1118 network->ssid_len);1119 if (network->ssid_len < IW_ESSID_MAX_SIZE)1120 memset(network->ssid + network->ssid_len, 0,1121 IW_ESSID_MAX_SIZE - network->ssid_len);1122 1123 LIBIPW_DEBUG_MGMT("WLAN_EID_SSID: '%*pE' len=%d.\n",1124 network->ssid_len, network->ssid,1125 network->ssid_len);1126 break;1127 1128 case WLAN_EID_SUPP_RATES:1129#ifdef CONFIG_LIBIPW_DEBUG1130 p = rates_str;1131#endif1132 network->rates_len = min(info_element->len,1133 MAX_RATES_LENGTH);1134 for (i = 0; i < network->rates_len; i++) {1135 network->rates[i] = info_element->data[i];1136#ifdef CONFIG_LIBIPW_DEBUG1137 p += scnprintf(p, sizeof(rates_str) -1138 (p - rates_str), "%02X ",1139 network->rates[i]);1140#endif1141 if (libipw_is_ofdm_rate1142 (info_element->data[i])) {1143 network->flags |= NETWORK_HAS_OFDM;1144 if (info_element->data[i] &1145 LIBIPW_BASIC_RATE_MASK)1146 network->flags &=1147 ~NETWORK_HAS_CCK;1148 }1149 }1150 1151 LIBIPW_DEBUG_MGMT("WLAN_EID_SUPP_RATES: '%s' (%d)\n",1152 rates_str, network->rates_len);1153 break;1154 1155 case WLAN_EID_EXT_SUPP_RATES:1156#ifdef CONFIG_LIBIPW_DEBUG1157 p = rates_str;1158#endif1159 network->rates_ex_len = min(info_element->len,1160 MAX_RATES_EX_LENGTH);1161 for (i = 0; i < network->rates_ex_len; i++) {1162 network->rates_ex[i] = info_element->data[i];1163#ifdef CONFIG_LIBIPW_DEBUG1164 p += scnprintf(p, sizeof(rates_str) -1165 (p - rates_str), "%02X ",1166 network->rates_ex[i]);1167#endif1168 if (libipw_is_ofdm_rate1169 (info_element->data[i])) {1170 network->flags |= NETWORK_HAS_OFDM;1171 if (info_element->data[i] &1172 LIBIPW_BASIC_RATE_MASK)1173 network->flags &=1174 ~NETWORK_HAS_CCK;1175 }1176 }1177 1178 LIBIPW_DEBUG_MGMT("WLAN_EID_EXT_SUPP_RATES: '%s' (%d)\n",1179 rates_str, network->rates_ex_len);1180 break;1181 1182 case WLAN_EID_DS_PARAMS:1183 LIBIPW_DEBUG_MGMT("WLAN_EID_DS_PARAMS: %d\n",1184 info_element->data[0]);1185 network->channel = info_element->data[0];1186 break;1187 1188 case WLAN_EID_FH_PARAMS:1189 LIBIPW_DEBUG_MGMT("WLAN_EID_FH_PARAMS: ignored\n");1190 break;1191 1192 case WLAN_EID_CF_PARAMS:1193 LIBIPW_DEBUG_MGMT("WLAN_EID_CF_PARAMS: ignored\n");1194 break;1195 1196 case WLAN_EID_TIM:1197 network->tim.tim_count = info_element->data[0];1198 network->tim.tim_period = info_element->data[1];1199 LIBIPW_DEBUG_MGMT("WLAN_EID_TIM: partially ignored\n");1200 break;1201 1202 case WLAN_EID_ERP_INFO:1203 network->erp_value = info_element->data[0];1204 network->flags |= NETWORK_HAS_ERP_VALUE;1205 LIBIPW_DEBUG_MGMT("MFIE_TYPE_ERP_SET: %d\n",1206 network->erp_value);1207 break;1208 1209 case WLAN_EID_IBSS_PARAMS:1210 network->atim_window = info_element->data[0];1211 LIBIPW_DEBUG_MGMT("WLAN_EID_IBSS_PARAMS: %d\n",1212 network->atim_window);1213 break;1214 1215 case WLAN_EID_CHALLENGE:1216 LIBIPW_DEBUG_MGMT("WLAN_EID_CHALLENGE: ignored\n");1217 break;1218 1219 case WLAN_EID_VENDOR_SPECIFIC:1220 LIBIPW_DEBUG_MGMT("WLAN_EID_VENDOR_SPECIFIC: %d bytes\n",1221 info_element->len);1222 if (!libipw_parse_qos_info_param_IE(info_element,1223 network))1224 break;1225 1226 if (info_element->len >= 4 &&1227 info_element->data[0] == 0x00 &&1228 info_element->data[1] == 0x50 &&1229 info_element->data[2] == 0xf2 &&1230 info_element->data[3] == 0x01) {1231 network->wpa_ie_len = min(info_element->len + 2,1232 MAX_WPA_IE_LEN);1233 memcpy(network->wpa_ie, info_element,1234 network->wpa_ie_len);1235 }1236 break;1237 1238 case WLAN_EID_RSN:1239 LIBIPW_DEBUG_MGMT("WLAN_EID_RSN: %d bytes\n",1240 info_element->len);1241 network->rsn_ie_len = min(info_element->len + 2,1242 MAX_WPA_IE_LEN);1243 memcpy(network->rsn_ie, info_element,1244 network->rsn_ie_len);1245 break;1246 1247 case WLAN_EID_QOS_PARAMETER:1248 printk(KERN_ERR1249 "QoS Error need to parse QOS_PARAMETER IE\n");1250 break;1251 /* 802.11h */1252 case WLAN_EID_PWR_CONSTRAINT:1253 network->power_constraint = info_element->data[0];1254 network->flags |= NETWORK_HAS_POWER_CONSTRAINT;1255 break;1256 1257 case WLAN_EID_CHANNEL_SWITCH:1258 network->power_constraint = info_element->data[0];1259 network->flags |= NETWORK_HAS_CSA;1260 break;1261 1262 case WLAN_EID_QUIET:1263 network->quiet.count = info_element->data[0];1264 network->quiet.period = info_element->data[1];1265 network->quiet.duration = info_element->data[2];1266 network->quiet.offset = info_element->data[3];1267 network->flags |= NETWORK_HAS_QUIET;1268 break;1269 1270 case WLAN_EID_IBSS_DFS:1271 network->flags |= NETWORK_HAS_IBSS_DFS;1272 break;1273 1274 case WLAN_EID_TPC_REPORT:1275 network->tpc_report.transmit_power =1276 info_element->data[0];1277 network->tpc_report.link_margin = info_element->data[1];1278 network->flags |= NETWORK_HAS_TPC_REPORT;1279 break;1280 1281 default:1282 LIBIPW_DEBUG_MGMT1283 ("Unsupported info element: %s (%d)\n",1284 get_info_element_string(info_element->id),1285 info_element->id);1286 break;1287 }1288 1289 length -= sizeof(*info_element) + info_element->len;1290 info_element =1291 (struct libipw_info_element *)&info_element->1292 data[info_element->len];1293 }1294 1295 return 0;1296}1297 1298static int libipw_handle_assoc_resp(struct libipw_device *ieee, struct libipw_assoc_response1299 *frame, struct libipw_rx_stats *stats)1300{1301 struct libipw_network network_resp = { };1302 struct libipw_network *network = &network_resp;1303 struct net_device *dev = ieee->dev;1304 1305 network->flags = 0;1306 network->qos_data.active = 0;1307 network->qos_data.supported = 0;1308 network->qos_data.param_count = 0;1309 network->qos_data.old_param_count = 0;1310 1311 //network->atim_window = le16_to_cpu(frame->aid) & (0x3FFF);1312 network->atim_window = le16_to_cpu(frame->aid);1313 network->listen_interval = le16_to_cpu(frame->status);1314 memcpy(network->bssid, frame->header.addr3, ETH_ALEN);1315 network->capability = le16_to_cpu(frame->capability);1316 network->last_scanned = jiffies;1317 network->rates_len = network->rates_ex_len = 0;1318 network->last_associate = 0;1319 network->ssid_len = 0;1320 network->erp_value =1321 (network->capability & WLAN_CAPABILITY_IBSS) ? 0x3 : 0x0;1322 1323 if (stats->freq == LIBIPW_52GHZ_BAND) {1324 /* for A band (No DS info) */1325 network->channel = stats->received_channel;1326 } else1327 network->flags |= NETWORK_HAS_CCK;1328 1329 network->wpa_ie_len = 0;1330 network->rsn_ie_len = 0;1331 1332 if (libipw_parse_info_param((void *)frame->variable,1333 stats->len - sizeof(*frame), network))1334 return 1;1335 1336 network->mode = 0;1337 if (stats->freq == LIBIPW_52GHZ_BAND)1338 network->mode = IEEE_A;1339 else {1340 if (network->flags & NETWORK_HAS_OFDM)1341 network->mode |= IEEE_G;1342 if (network->flags & NETWORK_HAS_CCK)1343 network->mode |= IEEE_B;1344 }1345 1346 memcpy(&network->stats, stats, sizeof(network->stats));1347 1348 if (ieee->handle_assoc_response != NULL)1349 ieee->handle_assoc_response(dev, frame, network);1350 1351 return 0;1352}1353 1354/***************************************************/1355 1356static int libipw_network_init(struct libipw_device *ieee, struct libipw_probe_response1357 *beacon,1358 struct libipw_network *network,1359 struct libipw_rx_stats *stats)1360{1361 network->qos_data.active = 0;1362 network->qos_data.supported = 0;1363 network->qos_data.param_count = 0;1364 network->qos_data.old_param_count = 0;1365 1366 /* Pull out fixed field data */1367 memcpy(network->bssid, beacon->header.addr3, ETH_ALEN);1368 network->capability = le16_to_cpu(beacon->capability);1369 network->last_scanned = jiffies;1370 network->time_stamp[0] = le32_to_cpu(beacon->time_stamp[0]);1371 network->time_stamp[1] = le32_to_cpu(beacon->time_stamp[1]);1372 network->beacon_interval = le16_to_cpu(beacon->beacon_interval);1373 /* Where to pull this? beacon->listen_interval; */1374 network->listen_interval = 0x0A;1375 network->rates_len = network->rates_ex_len = 0;1376 network->last_associate = 0;1377 network->ssid_len = 0;1378 network->flags = 0;1379 network->atim_window = 0;1380 network->erp_value = (network->capability & WLAN_CAPABILITY_IBSS) ?1381 0x3 : 0x0;1382 1383 if (stats->freq == LIBIPW_52GHZ_BAND) {1384 /* for A band (No DS info) */1385 network->channel = stats->received_channel;1386 } else1387 network->flags |= NETWORK_HAS_CCK;1388 1389 network->wpa_ie_len = 0;1390 network->rsn_ie_len = 0;1391 1392 if (libipw_parse_info_param((void *)beacon->variable,1393 stats->len - sizeof(*beacon), network))1394 return 1;1395 1396 network->mode = 0;1397 if (stats->freq == LIBIPW_52GHZ_BAND)1398 network->mode = IEEE_A;1399 else {1400 if (network->flags & NETWORK_HAS_OFDM)1401 network->mode |= IEEE_G;1402 if (network->flags & NETWORK_HAS_CCK)1403 network->mode |= IEEE_B;1404 }1405 1406 if (network->mode == 0) {1407 LIBIPW_DEBUG_SCAN("Filtered out '%*pE (%pM)' network.\n",1408 network->ssid_len, network->ssid,1409 network->bssid);1410 return 1;1411 }1412 1413 memcpy(&network->stats, stats, sizeof(network->stats));1414 1415 return 0;1416}1417 1418static inline int is_same_network(struct libipw_network *src,1419 struct libipw_network *dst)1420{1421 /* A network is only a duplicate if the channel, BSSID, and ESSID1422 * all match. We treat all <hidden> with the same BSSID and channel1423 * as one network */1424 return ((src->ssid_len == dst->ssid_len) &&1425 (src->channel == dst->channel) &&1426 ether_addr_equal_64bits(src->bssid, dst->bssid) &&1427 !memcmp(src->ssid, dst->ssid, src->ssid_len));1428}1429 1430static void update_network(struct libipw_network *dst,1431 struct libipw_network *src)1432{1433 int qos_active;1434 u8 old_param;1435 1436 /* We only update the statistics if they were created by receiving1437 * the network information on the actual channel the network is on.1438 *1439 * This keeps beacons received on neighbor channels from bringing1440 * down the signal level of an AP. */1441 if (dst->channel == src->stats.received_channel)1442 memcpy(&dst->stats, &src->stats,1443 sizeof(struct libipw_rx_stats));1444 else1445 LIBIPW_DEBUG_SCAN("Network %pM info received "1446 "off channel (%d vs. %d)\n", src->bssid,1447 dst->channel, src->stats.received_channel);1448 1449 dst->capability = src->capability;1450 memcpy(dst->rates, src->rates, src->rates_len);1451 dst->rates_len = src->rates_len;1452 memcpy(dst->rates_ex, src->rates_ex, src->rates_ex_len);1453 dst->rates_ex_len = src->rates_ex_len;1454 1455 dst->mode = src->mode;1456 dst->flags = src->flags;1457 dst->time_stamp[0] = src->time_stamp[0];1458 dst->time_stamp[1] = src->time_stamp[1];1459 1460 dst->beacon_interval = src->beacon_interval;1461 dst->listen_interval = src->listen_interval;1462 dst->atim_window = src->atim_window;1463 dst->erp_value = src->erp_value;1464 dst->tim = src->tim;1465 1466 memcpy(dst->wpa_ie, src->wpa_ie, src->wpa_ie_len);1467 dst->wpa_ie_len = src->wpa_ie_len;1468 memcpy(dst->rsn_ie, src->rsn_ie, src->rsn_ie_len);1469 dst->rsn_ie_len = src->rsn_ie_len;1470 1471 dst->last_scanned = jiffies;1472 qos_active = src->qos_data.active;1473 old_param = dst->qos_data.old_param_count;1474 if (dst->flags & NETWORK_HAS_QOS_MASK)1475 memcpy(&dst->qos_data, &src->qos_data,1476 sizeof(struct libipw_qos_data));1477 else {1478 dst->qos_data.supported = src->qos_data.supported;1479 dst->qos_data.param_count = src->qos_data.param_count;1480 }1481 1482 if (dst->qos_data.supported == 1) {1483 if (dst->ssid_len)1484 LIBIPW_DEBUG_QOS1485 ("QoS the network %s is QoS supported\n",1486 dst->ssid);1487 else1488 LIBIPW_DEBUG_QOS1489 ("QoS the network is QoS supported\n");1490 }1491 dst->qos_data.active = qos_active;1492 dst->qos_data.old_param_count = old_param;1493 1494 /* dst->last_associate is not overwritten */1495}1496 1497static inline int is_beacon(__le16 fc)1498{1499 return (WLAN_FC_GET_STYPE(le16_to_cpu(fc)) == IEEE80211_STYPE_BEACON);1500}1501 1502static void libipw_process_probe_response(struct libipw_device1503 *ieee, struct1504 libipw_probe_response1505 *beacon, struct libipw_rx_stats1506 *stats)1507{1508 struct net_device *dev = ieee->dev;1509 struct libipw_network network = { };1510 struct libipw_network *target;1511 struct libipw_network *oldest = NULL;1512#ifdef CONFIG_LIBIPW_DEBUG1513 struct libipw_info_element *info_element = (void *)beacon->variable;1514#endif1515 unsigned long flags;1516 1517 LIBIPW_DEBUG_SCAN("'%*pE' (%pM): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n",1518 info_element->len, info_element->data,1519 beacon->header.addr3,1520 (beacon->capability & cpu_to_le16(1 << 0xf)) ? '1' : '0',1521 (beacon->capability & cpu_to_le16(1 << 0xe)) ? '1' : '0',1522 (beacon->capability & cpu_to_le16(1 << 0xd)) ? '1' : '0',1523 (beacon->capability & cpu_to_le16(1 << 0xc)) ? '1' : '0',1524 (beacon->capability & cpu_to_le16(1 << 0xb)) ? '1' : '0',1525 (beacon->capability & cpu_to_le16(1 << 0xa)) ? '1' : '0',1526 (beacon->capability & cpu_to_le16(1 << 0x9)) ? '1' : '0',1527 (beacon->capability & cpu_to_le16(1 << 0x8)) ? '1' : '0',1528 (beacon->capability & cpu_to_le16(1 << 0x7)) ? '1' : '0',1529 (beacon->capability & cpu_to_le16(1 << 0x6)) ? '1' : '0',1530 (beacon->capability & cpu_to_le16(1 << 0x5)) ? '1' : '0',1531 (beacon->capability & cpu_to_le16(1 << 0x4)) ? '1' : '0',1532 (beacon->capability & cpu_to_le16(1 << 0x3)) ? '1' : '0',1533 (beacon->capability & cpu_to_le16(1 << 0x2)) ? '1' : '0',1534 (beacon->capability & cpu_to_le16(1 << 0x1)) ? '1' : '0',1535 (beacon->capability & cpu_to_le16(1 << 0x0)) ? '1' : '0');1536 1537 if (libipw_network_init(ieee, beacon, &network, stats)) {1538 LIBIPW_DEBUG_SCAN("Dropped '%*pE' (%pM) via %s.\n",1539 info_element->len, info_element->data,1540 beacon->header.addr3,1541 is_beacon(beacon->header.frame_ctl) ?1542 "BEACON" : "PROBE RESPONSE");1543 return;1544 }1545 1546 /* The network parsed correctly -- so now we scan our known networks1547 * to see if we can find it in our list.1548 *1549 * NOTE: This search is definitely not optimized. Once its doing1550 * the "right thing" we'll optimize it for efficiency if1551 * necessary */1552 1553 /* Search for this entry in the list and update it if it is1554 * already there. */1555 1556 spin_lock_irqsave(&ieee->lock, flags);1557 1558 list_for_each_entry(target, &ieee->network_list, list) {1559 if (is_same_network(target, &network))1560 break;1561 1562 if ((oldest == NULL) ||1563 time_before(target->last_scanned, oldest->last_scanned))1564 oldest = target;1565 }1566 1567 /* If we didn't find a match, then get a new network slot to initialize1568 * with this beacon's information */1569 if (&target->list == &ieee->network_list) {1570 if (list_empty(&ieee->network_free_list)) {1571 /* If there are no more slots, expire the oldest */1572 list_del(&oldest->list);1573 target = oldest;1574 LIBIPW_DEBUG_SCAN("Expired '%*pE' (%pM) from network list.\n",1575 target->ssid_len, target->ssid,1576 target->bssid);1577 } else {1578 /* Otherwise just pull from the free list */1579 target = list_entry(ieee->network_free_list.next,1580 struct libipw_network, list);1581 list_del(ieee->network_free_list.next);1582 }1583 1584#ifdef CONFIG_LIBIPW_DEBUG1585 LIBIPW_DEBUG_SCAN("Adding '%*pE' (%pM) via %s.\n",1586 network.ssid_len, network.ssid,1587 network.bssid,1588 is_beacon(beacon->header.frame_ctl) ?1589 "BEACON" : "PROBE RESPONSE");1590#endif1591 memcpy(target, &network, sizeof(*target));1592 list_add_tail(&target->list, &ieee->network_list);1593 } else {1594 LIBIPW_DEBUG_SCAN("Updating '%*pE' (%pM) via %s.\n",1595 target->ssid_len, target->ssid,1596 target->bssid,1597 is_beacon(beacon->header.frame_ctl) ?1598 "BEACON" : "PROBE RESPONSE");1599 update_network(target, &network);1600 }1601 1602 spin_unlock_irqrestore(&ieee->lock, flags);1603 1604 if (is_beacon(beacon->header.frame_ctl)) {1605 if (ieee->handle_beacon != NULL)1606 ieee->handle_beacon(dev, beacon, target);1607 } else {1608 if (ieee->handle_probe_response != NULL)1609 ieee->handle_probe_response(dev, beacon, target);1610 }1611}1612 1613void libipw_rx_mgt(struct libipw_device *ieee,1614 struct libipw_hdr_4addr *header,1615 struct libipw_rx_stats *stats)1616{1617 switch (WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl))) {1618 case IEEE80211_STYPE_ASSOC_RESP:1619 LIBIPW_DEBUG_MGMT("received ASSOCIATION RESPONSE (%d)\n",1620 WLAN_FC_GET_STYPE(le16_to_cpu1621 (header->frame_ctl)));1622 libipw_handle_assoc_resp(ieee,1623 (struct libipw_assoc_response *)1624 header, stats);1625 break;1626 1627 case IEEE80211_STYPE_REASSOC_RESP:1628 LIBIPW_DEBUG_MGMT("received REASSOCIATION RESPONSE (%d)\n",1629 WLAN_FC_GET_STYPE(le16_to_cpu1630 (header->frame_ctl)));1631 break;1632 1633 case IEEE80211_STYPE_PROBE_REQ:1634 LIBIPW_DEBUG_MGMT("received auth (%d)\n",1635 WLAN_FC_GET_STYPE(le16_to_cpu1636 (header->frame_ctl)));1637 1638 if (ieee->handle_probe_request != NULL)1639 ieee->handle_probe_request(ieee->dev,1640 (struct1641 libipw_probe_request *)1642 header, stats);1643 break;1644 1645 case IEEE80211_STYPE_PROBE_RESP:1646 LIBIPW_DEBUG_MGMT("received PROBE RESPONSE (%d)\n",1647 WLAN_FC_GET_STYPE(le16_to_cpu1648 (header->frame_ctl)));1649 LIBIPW_DEBUG_SCAN("Probe response\n");1650 libipw_process_probe_response(ieee,1651 (struct1652 libipw_probe_response *)1653 header, stats);1654 break;1655 1656 case IEEE80211_STYPE_BEACON:1657 LIBIPW_DEBUG_MGMT("received BEACON (%d)\n",1658 WLAN_FC_GET_STYPE(le16_to_cpu1659 (header->frame_ctl)));1660 LIBIPW_DEBUG_SCAN("Beacon\n");1661 libipw_process_probe_response(ieee,1662 (struct1663 libipw_probe_response *)1664 header, stats);1665 break;1666 case IEEE80211_STYPE_AUTH:1667 1668 LIBIPW_DEBUG_MGMT("received auth (%d)\n",1669 WLAN_FC_GET_STYPE(le16_to_cpu1670 (header->frame_ctl)));1671 1672 if (ieee->handle_auth != NULL)1673 ieee->handle_auth(ieee->dev,1674 (struct libipw_auth *)header);1675 break;1676 1677 case IEEE80211_STYPE_DISASSOC:1678 if (ieee->handle_disassoc != NULL)1679 ieee->handle_disassoc(ieee->dev,1680 (struct libipw_disassoc *)1681 header);1682 break;1683 1684 case IEEE80211_STYPE_ACTION:1685 LIBIPW_DEBUG_MGMT("ACTION\n");1686 if (ieee->handle_action)1687 ieee->handle_action(ieee->dev,1688 (struct libipw_action *)1689 header, stats);1690 break;1691 1692 case IEEE80211_STYPE_REASSOC_REQ:1693 LIBIPW_DEBUG_MGMT("received reassoc (%d)\n",1694 WLAN_FC_GET_STYPE(le16_to_cpu1695 (header->frame_ctl)));1696 1697 LIBIPW_DEBUG_MGMT("%s: LIBIPW_REASSOC_REQ received\n",1698 ieee->dev->name);1699 if (ieee->handle_reassoc_request != NULL)1700 ieee->handle_reassoc_request(ieee->dev,1701 (struct libipw_reassoc_request *)1702 header);1703 break;1704 1705 case IEEE80211_STYPE_ASSOC_REQ:1706 LIBIPW_DEBUG_MGMT("received assoc (%d)\n",1707 WLAN_FC_GET_STYPE(le16_to_cpu1708 (header->frame_ctl)));1709 1710 LIBIPW_DEBUG_MGMT("%s: LIBIPW_ASSOC_REQ received\n",1711 ieee->dev->name);1712 if (ieee->handle_assoc_request != NULL)1713 ieee->handle_assoc_request(ieee->dev);1714 break;1715 1716 case IEEE80211_STYPE_DEAUTH:1717 LIBIPW_DEBUG_MGMT("DEAUTH\n");1718 if (ieee->handle_deauth != NULL)1719 ieee->handle_deauth(ieee->dev,1720 (struct libipw_deauth *)1721 header);1722 break;1723 default:1724 LIBIPW_DEBUG_MGMT("received UNKNOWN (%d)\n",1725 WLAN_FC_GET_STYPE(le16_to_cpu1726 (header->frame_ctl)));1727 LIBIPW_DEBUG_MGMT("%s: Unknown management packet: %d\n",1728 ieee->dev->name,1729 WLAN_FC_GET_STYPE(le16_to_cpu1730 (header->frame_ctl)));1731 break;1732 }1733}1734 1735EXPORT_SYMBOL_GPL(libipw_rx_any);1736EXPORT_SYMBOL(libipw_rx_mgt);1737EXPORT_SYMBOL(libipw_rx);1738