2 * Original code based Host AP (software wireless LAN access point) driver
3 * for Intersil Prism2/2.5/3 - hostap.o module, common routines
5 * Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen
7 * Copyright (c) 2002-2003, Jouni Malinen <jkmaline@cc.hut.fi>
8 * Copyright (c) 2004, Intel Corporation
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation. See README and COPYING for
16 #include <linux/compiler.h>
17 #include <linux/config.h>
18 #include <linux/errno.h>
19 #include <linux/if_arp.h>
20 #include <linux/in6.h>
23 #include <linux/kernel.h>
24 #include <linux/module.h>
25 #include <linux/netdevice.h>
26 #include <linux/proc_fs.h>
27 #include <linux/skbuff.h>
28 #include <linux/slab.h>
29 #include <linux/tcp.h>
30 #include <linux/types.h>
31 #include <linux/version.h>
32 #include <linux/wireless.h>
33 #include <linux/etherdevice.h>
34 #include <asm/uaccess.h>
35 #include <linux/ctype.h>
37 #include <net/ieee80211.h>
39 static inline void ieee80211_monitor_rx(struct ieee80211_device *ieee,
41 struct ieee80211_rx_stats *rx_stats)
43 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
44 u16 fc = le16_to_cpu(hdr->frame_ctl);
47 skb->mac.raw = skb->data;
48 skb_pull(skb, ieee80211_get_hdrlen(fc));
49 skb->pkt_type = PACKET_OTHERHOST;
50 skb->protocol = __constant_htons(ETH_P_80211_RAW);
51 memset(skb->cb, 0, sizeof(skb->cb));
55 /* Called only as a tasklet (software IRQ) */
56 static struct ieee80211_frag_entry *ieee80211_frag_cache_find(struct
64 struct ieee80211_frag_entry *entry;
67 for (i = 0; i < IEEE80211_FRAG_CACHE_LEN; i++) {
68 entry = &ieee->frag_cache[i];
69 if (entry->skb != NULL &&
70 time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
71 IEEE80211_DEBUG_FRAG("expiring fragment cache entry "
72 "seq=%u last_frag=%u\n",
73 entry->seq, entry->last_frag);
74 dev_kfree_skb_any(entry->skb);
78 if (entry->skb != NULL && entry->seq == seq &&
79 (entry->last_frag + 1 == frag || frag == -1) &&
80 memcmp(entry->src_addr, src, ETH_ALEN) == 0 &&
81 memcmp(entry->dst_addr, dst, ETH_ALEN) == 0)
88 /* Called only as a tasklet (software IRQ) */
89 static struct sk_buff *ieee80211_frag_cache_get(struct ieee80211_device *ieee,
90 struct ieee80211_hdr *hdr)
92 struct sk_buff *skb = NULL;
94 unsigned int frag, seq;
95 struct ieee80211_frag_entry *entry;
97 sc = le16_to_cpu(hdr->seq_ctl);
98 frag = WLAN_GET_SEQ_FRAG(sc);
99 seq = WLAN_GET_SEQ_SEQ(sc);
102 /* Reserve enough space to fit maximum frame length */
103 skb = dev_alloc_skb(ieee->dev->mtu +
104 sizeof(struct ieee80211_hdr) +
107 8 /* WEP */ + ETH_ALEN /* WDS */ );
111 entry = &ieee->frag_cache[ieee->frag_next_idx];
112 ieee->frag_next_idx++;
113 if (ieee->frag_next_idx >= IEEE80211_FRAG_CACHE_LEN)
114 ieee->frag_next_idx = 0;
116 if (entry->skb != NULL)
117 dev_kfree_skb_any(entry->skb);
119 entry->first_frag_time = jiffies;
121 entry->last_frag = frag;
123 memcpy(entry->src_addr, hdr->addr2, ETH_ALEN);
124 memcpy(entry->dst_addr, hdr->addr1, ETH_ALEN);
126 /* received a fragment of a frame for which the head fragment
127 * should have already been received */
128 entry = ieee80211_frag_cache_find(ieee, seq, frag, hdr->addr2,
131 entry->last_frag = frag;
139 /* Called only as a tasklet (software IRQ) */
140 static int ieee80211_frag_cache_invalidate(struct ieee80211_device *ieee,
141 struct ieee80211_hdr *hdr)
145 struct ieee80211_frag_entry *entry;
147 sc = le16_to_cpu(hdr->seq_ctl);
148 seq = WLAN_GET_SEQ_SEQ(sc);
150 entry = ieee80211_frag_cache_find(ieee, seq, -1, hdr->addr2,
154 IEEE80211_DEBUG_FRAG("could not invalidate fragment cache "
155 "entry (seq=%u)\n", seq);
164 /* ieee80211_rx_frame_mgtmt
166 * Responsible for handling management control frames
168 * Called by ieee80211_rx */
170 ieee80211_rx_frame_mgmt(struct ieee80211_device *ieee, struct sk_buff *skb,
171 struct ieee80211_rx_stats *rx_stats, u16 type,
174 if (ieee->iw_mode == IW_MODE_MASTER) {
175 printk(KERN_DEBUG "%s: Master mode not yet suppported.\n",
179 hostap_update_sta_ps(ieee, (struct hostap_ieee80211_hdr *)
183 if (ieee->hostapd && type == WLAN_FC_TYPE_MGMT) {
184 if (stype == WLAN_FC_STYPE_BEACON &&
185 ieee->iw_mode == IW_MODE_MASTER) {
186 struct sk_buff *skb2;
187 /* Process beacon frames also in kernel driver to
188 * update STA(AP) table statistics */
189 skb2 = skb_clone(skb, GFP_ATOMIC);
191 hostap_rx(skb2->dev, skb2, rx_stats);
194 /* send management frames to the user space daemon for
196 ieee->apdevstats.rx_packets++;
197 ieee->apdevstats.rx_bytes += skb->len;
198 prism2_rx_80211(ieee->apdev, skb, rx_stats, PRISM2_RX_MGMT);
202 if (ieee->iw_mode == IW_MODE_MASTER) {
203 if (type != WLAN_FC_TYPE_MGMT && type != WLAN_FC_TYPE_CTRL) {
204 printk(KERN_DEBUG "%s: unknown management frame "
205 "(type=0x%02x, stype=0x%02x) dropped\n",
206 skb->dev->name, type, stype);
210 hostap_rx(skb->dev, skb, rx_stats);
214 printk(KERN_DEBUG "%s: hostap_rx_frame_mgmt: management frame "
215 "received in non-Host AP mode\n", skb->dev->name);
220 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
221 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
222 static unsigned char rfc1042_header[] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
224 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
225 static unsigned char bridge_tunnel_header[] =
226 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
227 /* No encapsulation header if EtherType < 0x600 (=length) */
229 /* Called by ieee80211_rx_frame_decrypt */
230 static int ieee80211_is_eapol_frame(struct ieee80211_device *ieee,
233 struct net_device *dev = ieee->dev;
235 struct ieee80211_hdr *hdr;
241 hdr = (struct ieee80211_hdr *)skb->data;
242 fc = le16_to_cpu(hdr->frame_ctl);
244 /* check that the frame is unicast frame to us */
245 if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
246 IEEE80211_FCTL_TODS &&
247 memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0 &&
248 memcmp(hdr->addr3, dev->dev_addr, ETH_ALEN) == 0) {
249 /* ToDS frame with own addr BSSID and DA */
250 } else if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
251 IEEE80211_FCTL_FROMDS &&
252 memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0) {
253 /* FromDS frame with own addr as DA */
257 if (skb->len < 24 + 8)
260 /* check for port access entity Ethernet type */
261 pos = skb->data + 24;
262 ethertype = (pos[6] << 8) | pos[7];
263 if (ethertype == ETH_P_PAE)
269 /* Called only as a tasklet (software IRQ), by ieee80211_rx */
271 ieee80211_rx_frame_decrypt(struct ieee80211_device *ieee, struct sk_buff *skb,
272 struct ieee80211_crypt_data *crypt)
274 struct ieee80211_hdr *hdr;
277 if (crypt == NULL || crypt->ops->decrypt_mpdu == NULL)
280 hdr = (struct ieee80211_hdr *)skb->data;
281 hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
283 #ifdef CONFIG_IEEE80211_CRYPT_TKIP
284 if (ieee->tkip_countermeasures && strcmp(crypt->ops->name, "TKIP") == 0) {
285 if (net_ratelimit()) {
286 printk(KERN_DEBUG "%s: TKIP countermeasures: dropped "
287 "received packet from " MAC_FMT "\n",
288 ieee->dev->name, MAC_ARG(hdr->addr2));
294 atomic_inc(&crypt->refcnt);
295 res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv);
296 atomic_dec(&crypt->refcnt);
298 IEEE80211_DEBUG_DROP("decryption failed (SA=" MAC_FMT
299 ") res=%d\n", MAC_ARG(hdr->addr2), res);
301 IEEE80211_DEBUG_DROP("Decryption failed ICV "
302 "mismatch (key %d)\n",
303 skb->data[hdrlen + 3] >> 6);
304 ieee->ieee_stats.rx_discards_undecryptable++;
311 /* Called only as a tasklet (software IRQ), by ieee80211_rx */
313 ieee80211_rx_frame_decrypt_msdu(struct ieee80211_device *ieee,
314 struct sk_buff *skb, int keyidx,
315 struct ieee80211_crypt_data *crypt)
317 struct ieee80211_hdr *hdr;
320 if (crypt == NULL || crypt->ops->decrypt_msdu == NULL)
323 hdr = (struct ieee80211_hdr *)skb->data;
324 hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
326 atomic_inc(&crypt->refcnt);
327 res = crypt->ops->decrypt_msdu(skb, keyidx, hdrlen, crypt->priv);
328 atomic_dec(&crypt->refcnt);
330 printk(KERN_DEBUG "%s: MSDU decryption/MIC verification failed"
331 " (SA=" MAC_FMT " keyidx=%d)\n",
332 ieee->dev->name, MAC_ARG(hdr->addr2), keyidx);
339 /* All received frames are sent to this function. @skb contains the frame in
340 * IEEE 802.11 format, i.e., in the format it was sent over air.
341 * This function is called only as a tasklet (software IRQ). */
342 int ieee80211_rx(struct ieee80211_device *ieee, struct sk_buff *skb,
343 struct ieee80211_rx_stats *rx_stats)
345 struct net_device *dev = ieee->dev;
346 struct ieee80211_hdr *hdr;
348 u16 fc, type, stype, sc;
349 struct net_device_stats *stats;
354 struct net_device *wds = NULL;
355 struct sk_buff *skb2 = NULL;
356 struct net_device *wds = NULL;
357 int frame_authorized = 0;
358 int from_assoc_ap = 0;
363 struct ieee80211_crypt_data *crypt = NULL;
366 hdr = (struct ieee80211_hdr *)skb->data;
367 stats = &ieee->stats;
370 printk(KERN_INFO "%s: SKB length < 10\n", dev->name);
374 fc = le16_to_cpu(hdr->frame_ctl);
375 type = WLAN_FC_GET_TYPE(fc);
376 stype = WLAN_FC_GET_STYPE(fc);
377 sc = le16_to_cpu(hdr->seq_ctl);
378 frag = WLAN_GET_SEQ_FRAG(sc);
379 hdrlen = ieee80211_get_hdrlen(fc);
381 /* Put this code here so that we avoid duplicating it in all
382 * Rx paths. - Jean II */
383 #ifdef IW_WIRELESS_SPY /* defined in iw_handler.h */
384 /* If spy monitoring on */
385 if (ieee->spy_data.spy_number > 0) {
386 struct iw_quality wstats;
389 if (rx_stats->mask & IEEE80211_STATMASK_RSSI) {
390 wstats.level = rx_stats->rssi;
391 wstats.updated |= IW_QUAL_LEVEL_UPDATED;
393 wstats.updated |= IW_QUAL_LEVEL_INVALID;
395 if (rx_stats->mask & IEEE80211_STATMASK_NOISE) {
396 wstats.noise = rx_stats->noise;
397 wstats.updated |= IW_QUAL_NOISE_UPDATED;
399 wstats.updated |= IW_QUAL_NOISE_INVALID;
401 if (rx_stats->mask & IEEE80211_STATMASK_SIGNAL) {
402 wstats.qual = rx_stats->signal;
403 wstats.updated |= IW_QUAL_QUAL_UPDATED;
405 wstats.updated |= IW_QUAL_QUAL_INVALID;
407 /* Update spy records */
408 wireless_spy_update(ieee->dev, hdr->addr2, &wstats);
410 #endif /* IW_WIRELESS_SPY */
413 hostap_update_rx_stats(local->ap, hdr, rx_stats);
416 if (ieee->iw_mode == IW_MODE_MONITOR) {
417 ieee80211_monitor_rx(ieee, skb, rx_stats);
419 stats->rx_bytes += skb->len;
423 if (ieee->host_decrypt) {
425 if (skb->len >= hdrlen + 3)
426 idx = skb->data[hdrlen + 3] >> 6;
427 crypt = ieee->crypt[idx];
431 /* Use station specific key to override default keys if the
432 * receiver address is a unicast address ("individual RA"). If
433 * bcrx_sta_key parameter is set, station specific key is used
434 * even with broad/multicast targets (this is against IEEE
435 * 802.11, but makes it easier to use different keys with
436 * stations that do not support WEP key mapping). */
438 if (!(hdr->addr1[0] & 0x01) || local->bcrx_sta_key)
439 (void)hostap_handle_sta_crypto(local, hdr, &crypt,
443 /* allow NULL decrypt to indicate an station specific override
444 * for default encryption */
445 if (crypt && (crypt->ops == NULL ||
446 crypt->ops->decrypt_mpdu == NULL))
449 if (!crypt && (fc & IEEE80211_FCTL_PROTECTED)) {
450 /* This seems to be triggered by some (multicast?)
451 * frames from other than current BSS, so just drop the
452 * frames silently instead of filling system log with
454 IEEE80211_DEBUG_DROP("Decryption failed (not set)"
455 " (SA=" MAC_FMT ")\n",
456 MAC_ARG(hdr->addr2));
457 ieee->ieee_stats.rx_discards_undecryptable++;
462 if (type != WLAN_FC_TYPE_DATA) {
463 if (type == WLAN_FC_TYPE_MGMT && stype == WLAN_FC_STYPE_AUTH &&
464 fc & IEEE80211_FCTL_PROTECTED && ieee->host_decrypt &&
465 (keyidx = hostap_rx_frame_decrypt(ieee, skb, crypt)) < 0) {
466 printk(KERN_DEBUG "%s: failed to decrypt mgmt::auth "
467 "from " MAC_FMT "\n", dev->name,
468 MAC_ARG(hdr->addr2));
469 /* TODO: could inform hostapd about this so that it
470 * could send auth failure report */
474 if (ieee80211_rx_frame_mgmt(ieee, skb, rx_stats, type, stype))
481 /* Data frame - extract src/dst addresses */
482 if (skb->len < IEEE80211_3ADDR_LEN)
485 switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) {
486 case IEEE80211_FCTL_FROMDS:
487 memcpy(dst, hdr->addr1, ETH_ALEN);
488 memcpy(src, hdr->addr3, ETH_ALEN);
490 case IEEE80211_FCTL_TODS:
491 memcpy(dst, hdr->addr3, ETH_ALEN);
492 memcpy(src, hdr->addr2, ETH_ALEN);
494 case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS:
495 if (skb->len < IEEE80211_4ADDR_LEN)
497 memcpy(dst, hdr->addr3, ETH_ALEN);
498 memcpy(src, hdr->addr4, ETH_ALEN);
501 memcpy(dst, hdr->addr1, ETH_ALEN);
502 memcpy(src, hdr->addr2, ETH_ALEN);
507 if (hostap_rx_frame_wds(ieee, hdr, fc, &wds))
510 skb->dev = dev = wds;
511 stats = hostap_get_stats(dev);
514 if (ieee->iw_mode == IW_MODE_MASTER && !wds &&
515 (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
516 IEEE80211_FCTL_FROMDS && ieee->stadev
517 && memcmp(hdr->addr2, ieee->assoc_ap_addr, ETH_ALEN) == 0) {
518 /* Frame from BSSID of the AP for which we are a client */
519 skb->dev = dev = ieee->stadev;
520 stats = hostap_get_stats(dev);
525 dev->last_rx = jiffies;
528 if ((ieee->iw_mode == IW_MODE_MASTER ||
529 ieee->iw_mode == IW_MODE_REPEAT) && !from_assoc_ap) {
530 switch (hostap_handle_sta_rx(ieee, dev, skb, rx_stats,
532 case AP_RX_CONTINUE_NOT_AUTHORIZED:
533 frame_authorized = 0;
536 frame_authorized = 1;
546 /* Nullfunc frames may have PS-bit set, so they must be passed to
547 * hostap_handle_sta_rx() before being dropped here. */
548 if (stype != IEEE80211_STYPE_DATA &&
549 stype != IEEE80211_STYPE_DATA_CFACK &&
550 stype != IEEE80211_STYPE_DATA_CFPOLL &&
551 stype != IEEE80211_STYPE_DATA_CFACKPOLL) {
552 if (stype != IEEE80211_STYPE_NULLFUNC)
553 IEEE80211_DEBUG_DROP("RX: dropped data frame "
554 "with no data (type=0x%02x, "
555 "subtype=0x%02x, len=%d)\n",
556 type, stype, skb->len);
560 /* skb: hdr + (possibly fragmented, possibly encrypted) payload */
562 if (ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
563 (keyidx = ieee80211_rx_frame_decrypt(ieee, skb, crypt)) < 0)
566 hdr = (struct ieee80211_hdr *)skb->data;
568 /* skb: hdr + (possibly fragmented) plaintext payload */
569 // PR: FIXME: hostap has additional conditions in the "if" below:
570 // ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
571 if ((frag != 0 || (fc & IEEE80211_FCTL_MOREFRAGS))) {
573 struct sk_buff *frag_skb = ieee80211_frag_cache_get(ieee, hdr);
574 IEEE80211_DEBUG_FRAG("Rx Fragment received (%u)\n", frag);
577 IEEE80211_DEBUG(IEEE80211_DL_RX | IEEE80211_DL_FRAG,
578 "Rx cannot get skb from fragment "
579 "cache (morefrag=%d seq=%u frag=%u)\n",
580 (fc & IEEE80211_FCTL_MOREFRAGS) != 0,
581 WLAN_GET_SEQ_SEQ(sc), frag);
589 if (frag_skb->tail + flen > frag_skb->end) {
590 printk(KERN_WARNING "%s: host decrypted and "
591 "reassembled frame did not fit skb\n",
593 ieee80211_frag_cache_invalidate(ieee, hdr);
598 /* copy first fragment (including full headers) into
599 * beginning of the fragment cache skb */
600 memcpy(skb_put(frag_skb, flen), skb->data, flen);
602 /* append frame payload to the end of the fragment
604 memcpy(skb_put(frag_skb, flen), skb->data + hdrlen,
607 dev_kfree_skb_any(skb);
610 if (fc & IEEE80211_FCTL_MOREFRAGS) {
611 /* more fragments expected - leave the skb in fragment
612 * cache for now; it will be delivered to upper layers
613 * after all fragments have been received */
617 /* this was the last fragment and the frame will be
618 * delivered, so remove skb from fragment cache */
620 hdr = (struct ieee80211_hdr *)skb->data;
621 ieee80211_frag_cache_invalidate(ieee, hdr);
624 /* skb: hdr + (possible reassembled) full MSDU payload; possibly still
625 * encrypted/authenticated */
626 if (ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
627 ieee80211_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt))
630 hdr = (struct ieee80211_hdr *)skb->data;
631 if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep) {
632 if ( /*ieee->ieee802_1x && */
633 ieee80211_is_eapol_frame(ieee, skb)) {
634 /* pass unencrypted EAPOL frames even if encryption is
637 IEEE80211_DEBUG_DROP("encryption configured, but RX "
638 "frame not encrypted (SA=" MAC_FMT
639 ")\n", MAC_ARG(hdr->addr2));
644 if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep &&
645 !ieee80211_is_eapol_frame(ieee, skb)) {
646 IEEE80211_DEBUG_DROP("dropped unencrypted RX data "
647 "frame from " MAC_FMT
648 " (drop_unencrypted=1)\n",
649 MAC_ARG(hdr->addr2));
653 /* skb: hdr + (possible reassembled) full plaintext payload */
655 payload = skb->data + hdrlen;
656 ethertype = (payload[6] << 8) | payload[7];
659 /* If IEEE 802.1X is used, check whether the port is authorized to send
660 * the received frame. */
661 if (ieee->ieee802_1x && ieee->iw_mode == IW_MODE_MASTER) {
662 if (ethertype == ETH_P_PAE) {
663 printk(KERN_DEBUG "%s: RX: IEEE 802.1X frame\n",
665 if (ieee->hostapd && ieee->apdev) {
666 /* Send IEEE 802.1X frames to the user
667 * space daemon for processing */
668 prism2_rx_80211(ieee->apdev, skb, rx_stats,
670 ieee->apdevstats.rx_packets++;
671 ieee->apdevstats.rx_bytes += skb->len;
674 } else if (!frame_authorized) {
675 printk(KERN_DEBUG "%s: dropped frame from "
676 "unauthorized port (IEEE 802.1X): "
677 "ethertype=0x%04x\n", dev->name, ethertype);
683 /* convert hdr + possible LLC headers into Ethernet header */
684 if (skb->len - hdrlen >= 8 &&
685 ((memcmp(payload, rfc1042_header, SNAP_SIZE) == 0 &&
686 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
687 memcmp(payload, bridge_tunnel_header, SNAP_SIZE) == 0)) {
688 /* remove RFC1042 or Bridge-Tunnel encapsulation and
689 * replace EtherType */
690 skb_pull(skb, hdrlen + SNAP_SIZE);
691 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
692 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
695 /* Leave Ethernet header part of hdr and full payload */
696 skb_pull(skb, hdrlen);
697 len = htons(skb->len);
698 memcpy(skb_push(skb, 2), &len, 2);
699 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
700 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
704 if (wds && ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
705 IEEE80211_FCTL_TODS) && skb->len >= ETH_HLEN + ETH_ALEN) {
706 /* Non-standard frame: get addr4 from its bogus location after
708 memcpy(skb->data + ETH_ALEN,
709 skb->data + skb->len - ETH_ALEN, ETH_ALEN);
710 skb_trim(skb, skb->len - ETH_ALEN);
715 stats->rx_bytes += skb->len;
718 if (ieee->iw_mode == IW_MODE_MASTER && !wds && ieee->ap->bridge_packets) {
720 /* copy multicast frame both to the higher layers and
721 * to the wireless media */
722 ieee->ap->bridged_multicast++;
723 skb2 = skb_clone(skb, GFP_ATOMIC);
725 printk(KERN_DEBUG "%s: skb_clone failed for "
726 "multicast frame\n", dev->name);
727 } else if (hostap_is_sta_assoc(ieee->ap, dst)) {
728 /* send frame directly to the associated STA using
729 * wireless media and not passing to higher layers */
730 ieee->ap->bridged_unicast++;
737 /* send to wireless media */
738 skb2->protocol = __constant_htons(ETH_P_802_3);
739 skb2->mac.raw = skb2->nh.raw = skb2->data;
740 /* skb2->nh.raw = skb2->data + ETH_HLEN; */
742 dev_queue_xmit(skb2);
747 skb->protocol = eth_type_trans(skb, dev);
748 memset(skb->cb, 0, sizeof(skb->cb));
750 skb->ip_summed = CHECKSUM_NONE; /* 802.11 crc not sufficient */
757 hostap_handle_sta_release(sta);
764 /* Returning 0 indicates to caller that we have not handled the SKB--
765 * so it is still allocated and can be used again by underlying
766 * hardware as a DMA target */
770 #define MGMT_FRAME_FIXED_PART_LENGTH 0x24
772 static inline int ieee80211_is_ofdm_rate(u8 rate)
774 switch (rate & ~IEEE80211_BASIC_RATE_MASK) {
775 case IEEE80211_OFDM_RATE_6MB:
776 case IEEE80211_OFDM_RATE_9MB:
777 case IEEE80211_OFDM_RATE_12MB:
778 case IEEE80211_OFDM_RATE_18MB:
779 case IEEE80211_OFDM_RATE_24MB:
780 case IEEE80211_OFDM_RATE_36MB:
781 case IEEE80211_OFDM_RATE_48MB:
782 case IEEE80211_OFDM_RATE_54MB:
788 static inline int ieee80211_network_init(struct ieee80211_device *ieee, struct ieee80211_probe_response
790 struct ieee80211_network *network,
791 struct ieee80211_rx_stats *stats)
793 #ifdef CONFIG_IEEE80211_DEBUG
797 struct ieee80211_info_element *info_element;
801 /* Pull out fixed field data */
802 memcpy(network->bssid, beacon->header.addr3, ETH_ALEN);
803 network->capability = le16_to_cpu(beacon->capability);
804 network->last_scanned = jiffies;
805 network->time_stamp[0] = le32_to_cpu(beacon->time_stamp[0]);
806 network->time_stamp[1] = le32_to_cpu(beacon->time_stamp[1]);
807 network->beacon_interval = le16_to_cpu(beacon->beacon_interval);
808 /* Where to pull this? beacon->listen_interval; */
809 network->listen_interval = 0x0A;
810 network->rates_len = network->rates_ex_len = 0;
811 network->last_associate = 0;
812 network->ssid_len = 0;
814 network->atim_window = 0;
816 if (stats->freq == IEEE80211_52GHZ_BAND) {
817 /* for A band (No DS info) */
818 network->channel = stats->received_channel;
820 network->flags |= NETWORK_HAS_CCK;
822 network->wpa_ie_len = 0;
823 network->rsn_ie_len = 0;
825 info_element = beacon->info_element;
826 left = stats->len - sizeof(*beacon);
827 while (left >= sizeof(struct ieee80211_info_element)) {
828 if (sizeof(struct ieee80211_info_element) + info_element->len >
831 ("SCAN: parse failed: info_element->len + 2 > left : info_element->len+2=%Zd left=%d.\n",
833 sizeof(struct ieee80211_info_element), left);
837 switch (info_element->id) {
839 if (ieee80211_is_empty_essid(info_element->data,
840 info_element->len)) {
841 network->flags |= NETWORK_EMPTY_ESSID;
845 network->ssid_len = min(info_element->len,
846 (u8) IW_ESSID_MAX_SIZE);
847 memcpy(network->ssid, info_element->data,
849 if (network->ssid_len < IW_ESSID_MAX_SIZE)
850 memset(network->ssid + network->ssid_len, 0,
851 IW_ESSID_MAX_SIZE - network->ssid_len);
853 IEEE80211_DEBUG_SCAN("MFIE_TYPE_SSID: '%s' len=%d.\n",
854 network->ssid, network->ssid_len);
857 case MFIE_TYPE_RATES:
858 #ifdef CONFIG_IEEE80211_DEBUG
862 min(info_element->len, MAX_RATES_LENGTH);
863 for (i = 0; i < network->rates_len; i++) {
864 network->rates[i] = info_element->data[i];
865 #ifdef CONFIG_IEEE80211_DEBUG
867 sizeof(rates_str) - (p -
869 "%02X ", network->rates[i]);
871 if (ieee80211_is_ofdm_rate
872 (info_element->data[i])) {
873 network->flags |= NETWORK_HAS_OFDM;
874 if (info_element->data[i] &
875 IEEE80211_BASIC_RATE_MASK)
881 IEEE80211_DEBUG_SCAN("MFIE_TYPE_RATES: '%s' (%d)\n",
882 rates_str, network->rates_len);
885 case MFIE_TYPE_RATES_EX:
886 #ifdef CONFIG_IEEE80211_DEBUG
889 network->rates_ex_len =
890 min(info_element->len, MAX_RATES_EX_LENGTH);
891 for (i = 0; i < network->rates_ex_len; i++) {
892 network->rates_ex[i] = info_element->data[i];
893 #ifdef CONFIG_IEEE80211_DEBUG
895 sizeof(rates_str) - (p -
897 "%02X ", network->rates[i]);
899 if (ieee80211_is_ofdm_rate
900 (info_element->data[i])) {
901 network->flags |= NETWORK_HAS_OFDM;
902 if (info_element->data[i] &
903 IEEE80211_BASIC_RATE_MASK)
909 IEEE80211_DEBUG_SCAN("MFIE_TYPE_RATES_EX: '%s' (%d)\n",
910 rates_str, network->rates_ex_len);
913 case MFIE_TYPE_DS_SET:
914 IEEE80211_DEBUG_SCAN("MFIE_TYPE_DS_SET: %d\n",
915 info_element->data[0]);
916 if (stats->freq == IEEE80211_24GHZ_BAND)
917 network->channel = info_element->data[0];
920 case MFIE_TYPE_FH_SET:
921 IEEE80211_DEBUG_SCAN("MFIE_TYPE_FH_SET: ignored\n");
924 case MFIE_TYPE_CF_SET:
925 IEEE80211_DEBUG_SCAN("MFIE_TYPE_CF_SET: ignored\n");
929 IEEE80211_DEBUG_SCAN("MFIE_TYPE_TIM: ignored\n");
932 case MFIE_TYPE_IBSS_SET:
933 IEEE80211_DEBUG_SCAN("MFIE_TYPE_IBSS_SET: ignored\n");
936 case MFIE_TYPE_CHALLENGE:
937 IEEE80211_DEBUG_SCAN("MFIE_TYPE_CHALLENGE: ignored\n");
940 case MFIE_TYPE_GENERIC:
941 IEEE80211_DEBUG_SCAN("MFIE_TYPE_GENERIC: %d bytes\n",
943 if (info_element->len >= 4 &&
944 info_element->data[0] == 0x00 &&
945 info_element->data[1] == 0x50 &&
946 info_element->data[2] == 0xf2 &&
947 info_element->data[3] == 0x01) {
948 network->wpa_ie_len = min(info_element->len + 2,
950 memcpy(network->wpa_ie, info_element,
951 network->wpa_ie_len);
956 IEEE80211_DEBUG_SCAN("MFIE_TYPE_RSN: %d bytes\n",
958 network->rsn_ie_len = min(info_element->len + 2,
960 memcpy(network->rsn_ie, info_element,
961 network->rsn_ie_len);
965 IEEE80211_DEBUG_SCAN("unsupported IE %d\n",
970 left -= sizeof(struct ieee80211_info_element) +
972 info_element = (struct ieee80211_info_element *)
973 &info_element->data[info_element->len];
977 if (stats->freq == IEEE80211_52GHZ_BAND)
978 network->mode = IEEE_A;
980 if (network->flags & NETWORK_HAS_OFDM)
981 network->mode |= IEEE_G;
982 if (network->flags & NETWORK_HAS_CCK)
983 network->mode |= IEEE_B;
986 if (network->mode == 0) {
987 IEEE80211_DEBUG_SCAN("Filtered out '%s (" MAC_FMT ")' "
989 escape_essid(network->ssid,
991 MAC_ARG(network->bssid));
995 if (ieee80211_is_empty_essid(network->ssid, network->ssid_len))
996 network->flags |= NETWORK_EMPTY_ESSID;
998 memcpy(&network->stats, stats, sizeof(network->stats));
1003 static inline int is_same_network(struct ieee80211_network *src,
1004 struct ieee80211_network *dst)
1006 /* A network is only a duplicate if the channel, BSSID, and ESSID
1007 * all match. We treat all <hidden> with the same BSSID and channel
1009 return ((src->ssid_len == dst->ssid_len) &&
1010 (src->channel == dst->channel) &&
1011 !memcmp(src->bssid, dst->bssid, ETH_ALEN) &&
1012 !memcmp(src->ssid, dst->ssid, src->ssid_len));
1015 static inline void update_network(struct ieee80211_network *dst,
1016 struct ieee80211_network *src)
1018 memcpy(&dst->stats, &src->stats, sizeof(struct ieee80211_rx_stats));
1019 dst->capability = src->capability;
1020 memcpy(dst->rates, src->rates, src->rates_len);
1021 dst->rates_len = src->rates_len;
1022 memcpy(dst->rates_ex, src->rates_ex, src->rates_ex_len);
1023 dst->rates_ex_len = src->rates_ex_len;
1025 dst->mode = src->mode;
1026 dst->flags = src->flags;
1027 dst->time_stamp[0] = src->time_stamp[0];
1028 dst->time_stamp[1] = src->time_stamp[1];
1030 dst->beacon_interval = src->beacon_interval;
1031 dst->listen_interval = src->listen_interval;
1032 dst->atim_window = src->atim_window;
1034 memcpy(dst->wpa_ie, src->wpa_ie, src->wpa_ie_len);
1035 dst->wpa_ie_len = src->wpa_ie_len;
1036 memcpy(dst->rsn_ie, src->rsn_ie, src->rsn_ie_len);
1037 dst->rsn_ie_len = src->rsn_ie_len;
1039 dst->last_scanned = jiffies;
1040 /* dst->last_associate is not overwritten */
1043 static inline void ieee80211_process_probe_response(struct ieee80211_device
1045 ieee80211_probe_response
1046 *beacon, struct ieee80211_rx_stats
1049 struct ieee80211_network network;
1050 struct ieee80211_network *target;
1051 struct ieee80211_network *oldest = NULL;
1052 #ifdef CONFIG_IEEE80211_DEBUG
1053 struct ieee80211_info_element *info_element = beacon->info_element;
1055 unsigned long flags;
1057 IEEE80211_DEBUG_SCAN("'%s' (" MAC_FMT
1058 "): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n",
1059 escape_essid(info_element->data,
1061 MAC_ARG(beacon->header.addr3),
1062 (beacon->capability & (1 << 0xf)) ? '1' : '0',
1063 (beacon->capability & (1 << 0xe)) ? '1' : '0',
1064 (beacon->capability & (1 << 0xd)) ? '1' : '0',
1065 (beacon->capability & (1 << 0xc)) ? '1' : '0',
1066 (beacon->capability & (1 << 0xb)) ? '1' : '0',
1067 (beacon->capability & (1 << 0xa)) ? '1' : '0',
1068 (beacon->capability & (1 << 0x9)) ? '1' : '0',
1069 (beacon->capability & (1 << 0x8)) ? '1' : '0',
1070 (beacon->capability & (1 << 0x7)) ? '1' : '0',
1071 (beacon->capability & (1 << 0x6)) ? '1' : '0',
1072 (beacon->capability & (1 << 0x5)) ? '1' : '0',
1073 (beacon->capability & (1 << 0x4)) ? '1' : '0',
1074 (beacon->capability & (1 << 0x3)) ? '1' : '0',
1075 (beacon->capability & (1 << 0x2)) ? '1' : '0',
1076 (beacon->capability & (1 << 0x1)) ? '1' : '0',
1077 (beacon->capability & (1 << 0x0)) ? '1' : '0');
1079 if (ieee80211_network_init(ieee, beacon, &network, stats)) {
1080 IEEE80211_DEBUG_SCAN("Dropped '%s' (" MAC_FMT ") via %s.\n",
1081 escape_essid(info_element->data,
1083 MAC_ARG(beacon->header.addr3),
1084 WLAN_FC_GET_STYPE(le16_to_cpu
1087 IEEE80211_STYPE_PROBE_RESP ?
1088 "PROBE RESPONSE" : "BEACON");
1092 /* The network parsed correctly -- so now we scan our known networks
1093 * to see if we can find it in our list.
1095 * NOTE: This search is definitely not optimized. Once its doing
1096 * the "right thing" we'll optimize it for efficiency if
1099 /* Search for this entry in the list and update it if it is
1102 spin_lock_irqsave(&ieee->lock, flags);
1104 list_for_each_entry(target, &ieee->network_list, list) {
1105 if (is_same_network(target, &network))
1108 if ((oldest == NULL) ||
1109 (target->last_scanned < oldest->last_scanned))
1113 /* If we didn't find a match, then get a new network slot to initialize
1114 * with this beacon's information */
1115 if (&target->list == &ieee->network_list) {
1116 if (list_empty(&ieee->network_free_list)) {
1117 /* If there are no more slots, expire the oldest */
1118 list_del(&oldest->list);
1120 IEEE80211_DEBUG_SCAN("Expired '%s' (" MAC_FMT ") from "
1122 escape_essid(target->ssid,
1124 MAC_ARG(target->bssid));
1126 /* Otherwise just pull from the free list */
1127 target = list_entry(ieee->network_free_list.next,
1128 struct ieee80211_network, list);
1129 list_del(ieee->network_free_list.next);
1132 #ifdef CONFIG_IEEE80211_DEBUG
1133 IEEE80211_DEBUG_SCAN("Adding '%s' (" MAC_FMT ") via %s.\n",
1134 escape_essid(network.ssid,
1136 MAC_ARG(network.bssid),
1137 WLAN_FC_GET_STYPE(le16_to_cpu
1140 IEEE80211_STYPE_PROBE_RESP ?
1141 "PROBE RESPONSE" : "BEACON");
1143 memcpy(target, &network, sizeof(*target));
1144 list_add_tail(&target->list, &ieee->network_list);
1146 IEEE80211_DEBUG_SCAN("Updating '%s' (" MAC_FMT ") via %s.\n",
1147 escape_essid(target->ssid,
1149 MAC_ARG(target->bssid),
1150 WLAN_FC_GET_STYPE(le16_to_cpu
1153 IEEE80211_STYPE_PROBE_RESP ?
1154 "PROBE RESPONSE" : "BEACON");
1155 update_network(target, &network);
1158 spin_unlock_irqrestore(&ieee->lock, flags);
1161 void ieee80211_rx_mgt(struct ieee80211_device *ieee,
1162 struct ieee80211_hdr *header,
1163 struct ieee80211_rx_stats *stats)
1165 switch (WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl))) {
1166 case IEEE80211_STYPE_ASSOC_RESP:
1167 IEEE80211_DEBUG_MGMT("received ASSOCIATION RESPONSE (%d)\n",
1168 WLAN_FC_GET_STYPE(le16_to_cpu
1169 (header->frame_ctl)));
1172 case IEEE80211_STYPE_REASSOC_RESP:
1173 IEEE80211_DEBUG_MGMT("received REASSOCIATION RESPONSE (%d)\n",
1174 WLAN_FC_GET_STYPE(le16_to_cpu
1175 (header->frame_ctl)));
1178 case IEEE80211_STYPE_PROBE_RESP:
1179 IEEE80211_DEBUG_MGMT("received PROBE RESPONSE (%d)\n",
1180 WLAN_FC_GET_STYPE(le16_to_cpu
1181 (header->frame_ctl)));
1182 IEEE80211_DEBUG_SCAN("Probe response\n");
1183 ieee80211_process_probe_response(ieee,
1185 ieee80211_probe_response *)
1189 case IEEE80211_STYPE_BEACON:
1190 IEEE80211_DEBUG_MGMT("received BEACON (%d)\n",
1191 WLAN_FC_GET_STYPE(le16_to_cpu
1192 (header->frame_ctl)));
1193 IEEE80211_DEBUG_SCAN("Beacon\n");
1194 ieee80211_process_probe_response(ieee,
1196 ieee80211_probe_response *)
1201 IEEE80211_DEBUG_MGMT("received UNKNOWN (%d)\n",
1202 WLAN_FC_GET_STYPE(le16_to_cpu
1203 (header->frame_ctl)));
1204 IEEE80211_WARNING("%s: Unknown management packet: %d\n",
1206 WLAN_FC_GET_STYPE(le16_to_cpu
1207 (header->frame_ctl)));
1212 EXPORT_SYMBOL(ieee80211_rx_mgt);
1213 EXPORT_SYMBOL(ieee80211_rx);