2 * Copyright 2002-2004, Instant802 Networks, Inc.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
9 #include <linux/config.h>
10 #include <linux/version.h>
11 #include <linux/module.h>
12 #include <linux/netdevice.h>
13 #include <linux/types.h>
14 #include <linux/slab.h>
15 #include <linux/skbuff.h>
16 #include <linux/compiler.h>
17 #include <linux/wireless.h>
18 #include <net/iw_handler.h>
20 #include <net/ieee80211.h>
21 #include <net/ieee80211_common.h>
22 #include "ieee80211_i.h"
27 #ifdef CONFIG_HOSTAPD_WPA_TESTING
28 #include "hostapd_ioctl.h"
29 #endif /* CONFIG_HOSTAPD_WPA_TESTING */
32 #define MICHAEL_MIC_HWACCEL
35 int ieee80211_get_hdr_info(const struct sk_buff *skb, u8 **sa, u8 **da,
36 u8 *qos_tid, u8 **data, size_t *data_len)
38 struct ieee80211_hdr *hdr;
44 hdr = (struct ieee80211_hdr *) skb->data;
45 fc = le16_to_cpu(hdr->frame_control);
48 if ((fc & (WLAN_FC_FROMDS | WLAN_FC_TODS)) ==
49 (WLAN_FC_FROMDS | WLAN_FC_TODS)) {
53 } else if (fc & WLAN_FC_FROMDS) {
56 } else if (fc & WLAN_FC_TODS) {
67 *data = skb->data + hdrlen;
68 *data_len = skb->len - hdrlen;
70 a4_included = (fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) ==
71 (WLAN_FC_TODS | WLAN_FC_FROMDS);
72 if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_DATA &&
73 WLAN_FC_GET_STYPE(fc) & 0x08) {
74 pos = (u8 *) &hdr->addr4;
77 *qos_tid = pos[0] & 0x0f;
78 *qos_tid |= 0x80; /* qos_included flag */
82 return skb->len < hdrlen ? -1 : 0;
87 ieee80211_tx_h_michael_mic_add(struct ieee80211_txrx_data *tx)
89 u8 *data, *sa, *da, *key, *mic, qos_tid;
92 struct sk_buff *skb = tx->skb;
94 #if defined(CONFIG_HOSTAPD_WPA_TESTING) || defined(MICHAEL_MIC_HWACCEL)
100 if (!tx->key || tx->key->alg != ALG_TKIP || skb->len < 24 ||
101 !WLAN_FC_DATA_PRESENT(fc))
102 return TXRX_CONTINUE;
104 if (ieee80211_get_hdr_info(skb, &sa, &da, &qos_tid, &data, &data_len))
107 #ifdef CONFIG_HOSTAPD_WPA_TESTING
108 if ((tx->sta && tx->sta->wpa_trigger & WPA_TRIGGER_FAIL_TX_MIC) ||
109 (!tx->u.tx.unicast &&
110 tx->local->wpa_trigger & WPA_TRIGGER_FAIL_TX_MIC)) {
113 #endif /* CONFIG_HOSTAPD_WPA_TESTING */
115 #ifdef MICHAEL_MIC_HWACCEL
116 if (!tx->key->force_sw_encrypt && !tx->local->conf.sw_decrypt &&
117 !tx->fragmented && !wpa_test) {
118 /* hwaccel - with no need for preallocated room for Michael MIC
120 return TXRX_CONTINUE;
122 #endif /* MICHAEL_MIC_HWACCEL */
124 if (skb_tailroom(skb) < MICHAEL_MIC_LEN) {
125 I802_DEBUG_INC(tx->local->tx_expand_skb_head);
126 if (unlikely(pskb_expand_head(skb, TKIP_IV_LEN,
127 MICHAEL_MIC_LEN + TKIP_ICV_LEN,
129 printk(KERN_DEBUG "%s: failed to allocate more memory "
130 "for Michael MIC\n", tx->dev->name);
136 authenticator = fc & WLAN_FC_FROMDS; /* FIX */
140 key = &tx->key->key[authenticator ? ALG_TKIP_TEMP_AUTH_TX_MIC_KEY :
141 ALG_TKIP_TEMP_AUTH_RX_MIC_KEY];
142 mic = skb_put(skb, MICHAEL_MIC_LEN);
143 michael_mic(key, da, sa, qos_tid & 0x0f, data, data_len, mic);
145 #ifdef CONFIG_HOSTAPD_WPA_TESTING
146 if (tx->sta && tx->sta->wpa_trigger & WPA_TRIGGER_FAIL_TX_MIC) {
147 printk(KERN_INFO "%s: WPA testing - corrupting TX Michael MIC "
148 "for STA " MACSTR "\n",
149 tx->dev->name, MAC2STR(tx->sta->addr));
150 tx->u.tx.control->key_idx = HW_KEY_IDX_INVALID;
151 tx->sta->wpa_trigger &= ~WPA_TRIGGER_FAIL_TX_MIC;
154 } else if (!tx->u.tx.unicast &&
155 tx->local->wpa_trigger & WPA_TRIGGER_FAIL_TX_MIC) {
156 printk(KERN_INFO "%s: WPA testing - corrupting TX Michael MIC "
157 "for Group Key\n", tx->dev->name);
158 tx->u.tx.control->key_idx = HW_KEY_IDX_INVALID;
159 tx->local->wpa_trigger &= ~WPA_TRIGGER_FAIL_TX_MIC;
163 #endif /* CONFIG_HOSTAPD_WPA_TESTING */
165 return TXRX_CONTINUE;
169 ieee80211_txrx_result
170 ieee80211_rx_h_michael_mic_verify(struct ieee80211_txrx_data *rx)
172 u8 *data, *sa, *da, *key = NULL, qos_tid;
175 u8 mic[MICHAEL_MIC_LEN];
176 struct sk_buff *skb = rx->skb;
177 int authenticator = 1, wpa_test = 0;
181 /* If device handles decryption totally, skip this check */
182 if (rx->local->hw->device_hides_wep ||
183 rx->local->hw->device_strips_mic)
184 return TXRX_CONTINUE;
186 if (!rx->key || rx->key->alg != ALG_TKIP ||
187 !(rx->fc & WLAN_FC_ISWEP) || !WLAN_FC_DATA_PRESENT(fc))
188 return TXRX_CONTINUE;
190 #ifdef CONFIG_HOSTAPD_WPA_TESTING
191 if (rx->sta && rx->sta->wpa_trigger & WPA_TRIGGER_FAIL_RX_MIC) {
194 #endif /* CONFIG_HOSTAPD_WPA_TESTING */
196 #ifdef MICHAEL_MIC_HWACCEL
197 if ((rx->u.rx.status->flag & RX_FLAG_DECRYPTED) &&
198 !rx->key->force_sw_encrypt && !rx->local->conf.sw_decrypt) {
199 if (rx->local->hw->wep_include_iv) {
200 if (skb->len < MICHAEL_MIC_LEN)
203 /* Need to verify Michael MIC sometimes in software even when
204 * hwaccel is used. Atheros ar5212: fragmented frames and QoS
206 if (!rx->fragmented && !wpa_test)
209 #endif /* MICHAEL_MIC_HWACCEL */
211 if (ieee80211_get_hdr_info(skb, &sa, &da, &qos_tid, &data, &data_len)
212 || data_len < MICHAEL_MIC_LEN)
215 data_len -= MICHAEL_MIC_LEN;
218 authenticator = fc & WLAN_FC_TODS; /* FIX */
222 key = &rx->key->key[authenticator ? ALG_TKIP_TEMP_AUTH_RX_MIC_KEY :
223 ALG_TKIP_TEMP_AUTH_TX_MIC_KEY];
224 michael_mic(key, da, sa, qos_tid & 0x0f, data, data_len, mic);
225 #ifdef CONFIG_HOSTAPD_WPA_TESTING
226 if (rx->sta && rx->sta->wpa_trigger & WPA_TRIGGER_FAIL_RX_MIC) {
227 printk(KERN_INFO "%s: WPA testing - corrupting RX Michael MIC "
228 "for STA " MACSTR "\n",
229 rx->dev->name, MAC2STR(rx->sta->addr));
230 rx->sta->wpa_trigger &= ~WPA_TRIGGER_FAIL_RX_MIC;
233 #endif /* CONFIG_HOSTAPD_WPA_TESTING */
234 if (memcmp(mic, data + data_len, MICHAEL_MIC_LEN) != 0 || wpa_test) {
235 #ifdef CONFIG_HOSTAPD_WPA_TESTING
237 #endif /* CONFIG_HOSTAPD_WPA_TESTING */
238 printk(KERN_DEBUG "%s: invalid Michael MIC in data frame from "
239 MACSTR "\n", rx->dev->name, MAC2STR(sa));
240 #ifdef CONFIG_HOSTAPD_WPA_TESTING
241 printk(KERN_DEBUG " received");
242 for (i = 0; i < MICHAEL_MIC_LEN; i++)
243 printk(" %02x", data[data_len + i]);
245 for (i = 0; i < MICHAEL_MIC_LEN; i++)
246 printk(" %02x", mic[i]);
248 printk(KERN_DEBUG " SA=" MACSTR " DA=" MACSTR " key",
249 MAC2STR(sa), MAC2STR(da));
250 for (i = 0; i < 8; i++)
251 printk(" %02x", key[i]);
252 printk(" (%d)\n", authenticator);
253 #endif /* CONFIG_HOSTAPD_WPA_TESTING */
256 struct ieee80211_hdr *hdr;
257 union iwreq_data wrqu;
258 char *buf = kmalloc(128, GFP_ATOMIC);
262 /* TODO: needed parameters: count, key type, TSC */
263 hdr = (struct ieee80211_hdr *) skb->data;
264 sprintf(buf, "MLME-MICHAELMICFAILURE.indication("
265 "keyid=%d %scast addr=" MACSTR ")",
267 hdr->addr1[0] & 0x01 ? "broad" : "uni",
268 MAC2STR(hdr->addr2));
269 memset(&wrqu, 0, sizeof(wrqu));
270 wrqu.data.length = strlen(buf);
271 wireless_send_event(rx->dev, IWEVCUSTOM, &wrqu, buf);
275 ieee80211_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status,
276 ieee80211_msg_michael_mic_failure);
281 #ifdef MICHAEL_MIC_HWACCEL
283 #endif /* MICHAEL_MIC_HWACCEL */
284 /* remove Michael MIC from payload */
285 skb_trim(skb, skb->len - MICHAEL_MIC_LEN);
287 return TXRX_CONTINUE;
291 static int tkip_encrypt_skb(struct ieee80211_txrx_data *tx,
292 struct sk_buff *skb, int test)
294 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
295 struct ieee80211_key *key = tx->key;
296 int hdrlen, len, tailneed;
300 fc = le16_to_cpu(hdr->frame_control);
301 hdrlen = ieee80211_get_hdrlen(fc);
302 len = skb->len - hdrlen;
304 tailneed = (!tx->key->force_sw_encrypt && !tx->local->conf.sw_decrypt)
306 if ((skb_headroom(skb) < TKIP_IV_LEN ||
307 skb_tailroom(skb) < tailneed)) {
308 I802_DEBUG_INC(tx->local->tx_expand_skb_head);
309 if (unlikely(pskb_expand_head(skb, TKIP_IV_LEN, tailneed,
314 pos = skb_push(skb, TKIP_IV_LEN);
315 memmove(pos, pos + TKIP_IV_LEN, hdrlen);
318 #ifdef CONFIG_HOSTAPD_WPA_TESTING
319 if (test & WPA_TRIGGER_TX_REPLAY)
322 #endif /* CONFIG_HOSTAPD_WPA_TESTING */
324 /* Increase IV for the frame */
326 if (key->u.tkip.iv16 == 0)
329 #ifdef CONFIG_HOSTAPD_WPA_TESTING
330 if (test & WPA_TRIGGER_TX_SKIP_SEQ) {
335 #endif /* CONFIG_HOSTAPD_WPA_TESTING */
337 if (!tx->key->force_sw_encrypt && !tx->local->conf.sw_decrypt
338 #ifdef CONFIG_HOSTAPD_WPA_TESTING
340 #endif /* CONFIG_HOSTAPD_WPA_TESTING */
342 /* hwaccel - with preallocated room for IV */
344 ieee80211_tkip_add_iv(pos, key,
345 (u8) (key->u.tkip.iv16 >> 8),
346 (u8) (((key->u.tkip.iv16 >> 8) | 0x20) &
348 (u8) key->u.tkip.iv16);
350 tx->u.tx.control->key_idx = tx->key->hw_key_idx;
354 /* Add room for ICV */
355 skb_put(skb, TKIP_ICV_LEN);
357 hdr = (struct ieee80211_hdr *) skb->data;
358 ieee80211_tkip_encrypt_data(key, pos, len, hdr->addr2);
363 ieee80211_txrx_result
364 ieee80211_tx_h_tkip_encrypt(struct ieee80211_txrx_data *tx)
366 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
368 struct ieee80211_key *key = tx->key;
369 struct sk_buff *skb = tx->skb;
370 int wpa_test = 0, test = 0;
372 fc = le16_to_cpu(hdr->frame_control);
374 if (!key || key->alg != ALG_TKIP || !WLAN_FC_DATA_PRESENT(fc))
375 return TXRX_CONTINUE;
377 tx->u.tx.control->icv_len = TKIP_ICV_LEN;
378 tx->u.tx.control->iv_len = TKIP_IV_LEN;
379 ieee80211_tx_set_iswep(tx);
381 #ifdef CONFIG_HOSTAPD_WPA_TESTING
382 if ((tx->sta && tx->sta->wpa_trigger & WPA_TRIGGER_FAIL_TX_ICV) ||
383 (!tx->u.tx.unicast &&
384 tx->local->wpa_trigger & WPA_TRIGGER_FAIL_TX_ICV)) {
389 test = tx->sta->wpa_trigger;
390 tx->sta->wpa_trigger &=
391 ~(WPA_TRIGGER_TX_REPLAY | WPA_TRIGGER_TX_REPLAY_FRAG |
392 WPA_TRIGGER_TX_SKIP_SEQ);
394 test = tx->local->wpa_trigger;
395 tx->local->wpa_trigger &=
396 ~(WPA_TRIGGER_TX_REPLAY | WPA_TRIGGER_TX_REPLAY_FRAG |
397 WPA_TRIGGER_TX_SKIP_SEQ);
400 (WPA_TRIGGER_TX_REPLAY | WPA_TRIGGER_TX_REPLAY_FRAG |
401 WPA_TRIGGER_TX_SKIP_SEQ)) {
402 printk(KERN_INFO "%s: WPA testing - TKIP TX packet number "
403 "%s%s%s%s\n", tx->dev->name,
404 tx->sta ? "[UNICAST]" : "[MULTICAST]",
405 test & WPA_TRIGGER_TX_REPLAY ? "[REPLAY]" : "",
406 test & WPA_TRIGGER_TX_REPLAY_FRAG ?
407 "[REPLAY FRAG]" : "",
408 test & WPA_TRIGGER_TX_SKIP_SEQ ? "[SKIP SEQ]" : "");
410 #endif /* CONFIG_HOSTAPD_WPA_TESTING */
412 if (!tx->key->force_sw_encrypt && !tx->local->conf.sw_decrypt &&
413 !tx->local->hw->wep_include_iv && !wpa_test) {
414 /* hwaccel - with no need for preallocated room for IV/ICV */
415 tx->u.tx.control->key_idx = tx->key->hw_key_idx;
416 return TXRX_CONTINUE;
419 if (tkip_encrypt_skb(tx, skb, test) < 0)
422 if (tx->u.tx.extra_frag) {
424 #ifdef CONFIG_HOSTAPD_WPA_TESTING
425 if (test & WPA_TRIGGER_TX_REPLAY_FRAG)
426 test |= WPA_TRIGGER_TX_REPLAY;
427 #endif /* CONFIG_HOSTAPD_WPA_TESTING */
428 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
429 if (tkip_encrypt_skb(tx, tx->u.tx.extra_frag[i], test)
435 #ifdef CONFIG_HOSTAPD_WPA_TESTING
436 if (tx->sta && tx->sta->wpa_trigger & WPA_TRIGGER_FAIL_TX_ICV) {
437 printk(KERN_INFO "%s: WPA testing - corrupting TX TKIP ICV "
438 "for STA " MACSTR "\n",
439 tx->dev->name, MAC2STR(tx->sta->addr));
440 tx->u.tx.control->key_idx = HW_KEY_IDX_INVALID;
441 tx->sta->wpa_trigger &= ~WPA_TRIGGER_FAIL_TX_ICV;
442 skb->data[skb->len - 1]++;
443 } else if (!tx->u.tx.unicast &&
444 tx->local->wpa_trigger & WPA_TRIGGER_FAIL_TX_ICV) {
445 printk(KERN_INFO "%s: WPA testing - corrupting TX TKIP ICV "
448 tx->u.tx.control->key_idx = HW_KEY_IDX_INVALID;
449 tx->local->wpa_trigger &= ~WPA_TRIGGER_FAIL_TX_ICV;
450 skb->data[skb->len - 1]++;
452 #endif /* CONFIG_HOSTAPD_WPA_TESTING */
454 return TXRX_CONTINUE;
458 ieee80211_txrx_result
459 ieee80211_rx_h_tkip_decrypt(struct ieee80211_txrx_data *rx)
461 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
463 int hdrlen, res, hwaccel = 0, wpa_test = 0;
464 struct ieee80211_key *key = rx->key;
465 struct sk_buff *skb = rx->skb;
467 fc = le16_to_cpu(hdr->frame_control);
468 hdrlen = ieee80211_get_hdrlen(fc);
470 if (!rx->key || rx->key->alg != ALG_TKIP ||
471 !(rx->fc & WLAN_FC_ISWEP) ||
472 WLAN_FC_GET_TYPE(rx->fc) != WLAN_FC_TYPE_DATA)
473 return TXRX_CONTINUE;
475 if (!rx->sta || skb->len - hdrlen < 12)
478 #ifdef CONFIG_HOSTAPD_WPA_TESTING
479 if (rx->sta && rx->sta->wpa_trigger & WPA_TRIGGER_FAIL_RX_ICV) {
480 printk(KERN_INFO "%s: WPA testing - corrupting RX TKIP ICV "
481 "for STA " MACSTR "\n",
482 rx->dev->name, MAC2STR(rx->sta->addr));
483 rx->sta->wpa_trigger &= ~WPA_TRIGGER_FAIL_RX_ICV;
484 skb->data[skb->len - 1]++;
487 #endif /* CONFIG_HOSTAPD_WPA_TESTING */
489 if ((rx->u.rx.status->flag & RX_FLAG_DECRYPTED) &&
490 !rx->key->force_sw_encrypt && !rx->local->conf.sw_decrypt) {
491 if (!rx->local->hw->wep_include_iv) {
492 /* Hardware takes care of all processing, including
493 * replay protection, so no need to continue here. */
494 return TXRX_CONTINUE;
497 /* let TKIP code verify IV, but skip decryption */
501 res = ieee80211_tkip_decrypt_data(key, skb->data + hdrlen,
502 skb->len - hdrlen, rx->sta->addr,
503 hwaccel, rx->u.rx.queue);
504 if (res != TKIP_DECRYPT_OK || wpa_test) {
505 printk(KERN_DEBUG "%s: TKIP decrypt failed for RX frame from "
506 MACSTR " (res=%d)\n",
507 rx->dev->name, MAC2STR(rx->sta->addr), res);
512 skb_trim(skb, skb->len - TKIP_ICV_LEN);
515 memmove(skb->data + TKIP_IV_LEN, skb->data, hdrlen);
516 skb_pull(skb, TKIP_IV_LEN);
518 return TXRX_CONTINUE;
522 static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad,
526 int a4_included, qos_included;
527 u8 qos_tid, *fc_pos, *data, *sa, *da;
530 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
532 fc_pos = (u8 *) &hdr->frame_control;
533 fc = fc_pos[0] ^ (fc_pos[1] << 8);
534 a4_included = (fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) ==
535 (WLAN_FC_TODS | WLAN_FC_FROMDS);
537 ieee80211_get_hdr_info(skb, &sa, &da, &qos_tid, &data, &data_len);
538 data_len -= CCMP_HDR_LEN + (encrypted ? CCMP_MIC_LEN : 0);
539 if (qos_tid & 0x80) {
544 /* First block, b_0 */
546 b_0[0] = 0x59; /* flags: Adata: 1, M: 011, L: 001 */
547 /* Nonce: QoS Priority | A2 | PN */
549 memcpy(&b_0[2], hdr->addr2, 6);
550 memcpy(&b_0[8], pn, CCMP_PN_LEN);
552 b_0[14] = (data_len >> 8) & 0xff;
553 b_0[15] = data_len & 0xff;
556 /* AAD (extra authenticate-only data) / masked 802.11 header
557 * FC | A1 | A2 | A3 | SC | [A4] | [QC] */
559 len_a = a4_included ? 28 : 22;
563 aad[0] = 0; /* (len_a >> 8) & 0xff; */
564 aad[1] = len_a & 0xff;
565 /* Mask FC: zero subtype b4 b5 b6 */
566 aad[2] = fc_pos[0] & ~(BIT(4) | BIT(5) | BIT(6));
567 /* Retry, PwrMgt, MoreData; set Protected */
568 aad[3] = (fc_pos[1] & ~(BIT(3) | BIT(4) | BIT(5))) | BIT(6);
569 memcpy(&aad[4], &hdr->addr1, 18);
571 /* Mask Seq#, leave Frag# */
572 aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f;
575 memcpy(&aad[24], hdr->addr4, 6);
579 memset(&aad[24], 0, 8);
581 u8 *dpos = &aad[a4_included ? 30 : 24];
583 /* Mask QoS Control field */
590 static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn, int key_id)
595 hdr[3] = 0x20 | (key_id << 6);
603 static inline int ccmp_hdr2pn(u8 *pn, u8 *hdr)
611 return (hdr[3] >> 6) & 0x03;
615 static int ccmp_encrypt_skb(struct ieee80211_txrx_data *tx,
616 struct sk_buff *skb, int test)
618 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
619 struct ieee80211_key *key = tx->key;
620 int hdrlen, len, tailneed;
623 u8 b_0[AES_BLOCK_LEN], aad[2 * AES_BLOCK_LEN];
626 fc = le16_to_cpu(hdr->frame_control);
627 hdrlen = ieee80211_get_hdrlen(fc);
628 len = skb->len - hdrlen;
630 tailneed = (!tx->key->force_sw_encrypt && !tx->local->conf.sw_decrypt)
633 if ((skb_headroom(skb) < CCMP_HDR_LEN ||
634 skb_tailroom(skb) < tailneed)) {
635 I802_DEBUG_INC(tx->local->tx_expand_skb_head);
636 if (unlikely(pskb_expand_head(skb, CCMP_HDR_LEN, tailneed,
641 pos = skb_push(skb, CCMP_HDR_LEN);
642 memmove(pos, pos + CCMP_HDR_LEN, hdrlen);
643 hdr = (struct ieee80211_hdr *) pos;
647 pn = key->u.ccmp.tx_pn;
649 #ifdef CONFIG_HOSTAPD_WPA_TESTING
650 if (test & WPA_TRIGGER_TX_REPLAY)
653 #endif /* CONFIG_HOSTAPD_WPA_TESTING */
655 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
661 #ifdef CONFIG_HOSTAPD_WPA_TESTING
662 if (test & WPA_TRIGGER_TX_SKIP_SEQ) {
667 #endif /* CONFIG_HOSTAPD_WPA_TESTING */
669 ccmp_pn2hdr(pos, pn, key->keyidx);
671 if (!tx->key->force_sw_encrypt && !tx->local->conf.sw_decrypt) {
672 /* hwaccel - with preallocated room for CCMP header */
673 tx->u.tx.control->key_idx = tx->key->hw_key_idx;
678 ccmp_special_blocks(skb, pn, b_0, aad, 0);
679 ieee80211_aes_ccm_encrypt(key->u.ccmp.aes_state, b_0, aad, pos, len,
680 pos, skb_put(skb, CCMP_MIC_LEN));
686 ieee80211_txrx_result
687 ieee80211_tx_h_ccmp_encrypt(struct ieee80211_txrx_data *tx)
689 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
690 struct ieee80211_key *key = tx->key;
692 struct sk_buff *skb = tx->skb;
695 fc = le16_to_cpu(hdr->frame_control);
697 if (!key || key->alg != ALG_CCMP || !WLAN_FC_DATA_PRESENT(fc))
698 return TXRX_CONTINUE;
700 #ifdef CONFIG_HOSTAPD_WPA_TESTING
702 test = tx->sta->wpa_trigger;
703 tx->sta->wpa_trigger = 0;
705 test = tx->local->wpa_trigger;
706 tx->local->wpa_trigger = 0;
709 (WPA_TRIGGER_TX_REPLAY | WPA_TRIGGER_TX_REPLAY_FRAG |
710 WPA_TRIGGER_TX_SKIP_SEQ)) {
711 printk(KERN_INFO "%s: WPA testing - CCMP TX packet number "
712 "%s%s%s%s\n", tx->dev->name,
713 tx->sta ? "[UNICAST]" : "[MULTICAST]",
714 test & WPA_TRIGGER_TX_REPLAY ? "[REPLAY]" : "",
715 test & WPA_TRIGGER_TX_REPLAY_FRAG ?
716 "[REPLAY FRAG]" : "",
717 test & WPA_TRIGGER_TX_SKIP_SEQ ? "[SKIP SEQ]" : "");
719 #endif /* CONFIG_HOSTAPD_WPA_TESTING */
721 tx->u.tx.control->icv_len = CCMP_MIC_LEN;
722 tx->u.tx.control->iv_len = CCMP_HDR_LEN;
723 ieee80211_tx_set_iswep(tx);
725 if (!tx->key->force_sw_encrypt && !tx->local->conf.sw_decrypt &&
726 !tx->local->hw->wep_include_iv) {
727 /* hwaccel - with no need for preallocated room for CCMP "
728 * header or MIC fields */
729 tx->u.tx.control->key_idx = tx->key->hw_key_idx;
730 return TXRX_CONTINUE;
733 if (ccmp_encrypt_skb(tx, skb, test) < 0)
736 if (tx->u.tx.extra_frag) {
738 #ifdef CONFIG_HOSTAPD_WPA_TESTING
739 if (test & WPA_TRIGGER_TX_REPLAY_FRAG)
740 test |= WPA_TRIGGER_TX_REPLAY;
741 #endif /* CONFIG_HOSTAPD_WPA_TESTING */
742 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
743 if (ccmp_encrypt_skb(tx, tx->u.tx.extra_frag[i], test)
749 return TXRX_CONTINUE;
753 ieee80211_txrx_result
754 ieee80211_rx_h_ccmp_decrypt(struct ieee80211_txrx_data *rx)
756 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
759 struct ieee80211_key *key = rx->key;
760 struct sk_buff *skb = rx->skb;
761 u8 b_0[AES_BLOCK_LEN], aad[2 * AES_BLOCK_LEN];
765 fc = le16_to_cpu(hdr->frame_control);
766 hdrlen = ieee80211_get_hdrlen(fc);
768 if (!rx->key || rx->key->alg != ALG_CCMP ||
769 !(rx->fc & WLAN_FC_ISWEP) ||
770 WLAN_FC_GET_TYPE(rx->fc) != WLAN_FC_TYPE_DATA)
771 return TXRX_CONTINUE;
773 data_len = skb->len - hdrlen - CCMP_HDR_LEN - CCMP_MIC_LEN;
774 if (!rx->sta || data_len < 0)
777 if ((rx->u.rx.status->flag & RX_FLAG_DECRYPTED) &&
778 !rx->key->force_sw_encrypt && !rx->local->conf.sw_decrypt &&
779 !rx->local->hw->wep_include_iv)
780 return TXRX_CONTINUE;
782 (void) ccmp_hdr2pn(pn, skb->data + hdrlen);
784 if (memcmp(pn, key->u.ccmp.rx_pn[rx->u.rx.queue], CCMP_PN_LEN) <= 0) {
785 #ifdef CONFIG_IEEE80211_DEBUG
786 u8 *ppn = key->u.ccmp.rx_pn[rx->u.rx.queue];
787 printk(KERN_DEBUG "%s: CCMP replay detected for RX frame from "
788 MACSTR " (RX PN %02x%02x%02x%02x%02x%02x <= prev. PN "
789 "%02x%02x%02x%02x%02x%02x)\n", rx->dev->name,
790 MAC2STR(rx->sta->addr),
791 pn[0], pn[1], pn[2], pn[3], pn[4], pn[5],
792 ppn[0], ppn[1], ppn[2], ppn[3], ppn[4], ppn[5]);
793 #endif /* CONFIG_IEEE80211_DEBUG */
794 key->u.ccmp.replays++;
798 if ((rx->u.rx.status->flag & RX_FLAG_DECRYPTED) &&
799 !rx->key->force_sw_encrypt && !rx->local->conf.sw_decrypt) {
800 /* hwaccel has already decrypted frame and verified MIC */
802 ccmp_special_blocks(skb, pn, b_0, aad, 1);
804 if (ieee80211_aes_ccm_decrypt(
805 key->u.ccmp.aes_state, b_0, aad,
806 skb->data + hdrlen + CCMP_HDR_LEN, data_len,
807 skb->data + skb->len - CCMP_MIC_LEN,
808 skb->data + hdrlen + CCMP_HDR_LEN)) {
809 printk(KERN_DEBUG "%s: CCMP decrypt failed for RX "
810 "frame from " MACSTR "\n", rx->dev->name,
811 MAC2STR(rx->sta->addr));
816 memcpy(key->u.ccmp.rx_pn[rx->u.rx.queue], pn, CCMP_PN_LEN);
818 /* Remove CCMP header and MIC */
819 skb_trim(skb, skb->len - CCMP_MIC_LEN);
820 memmove(skb->data + CCMP_HDR_LEN, skb->data, hdrlen);
821 skb_pull(skb, CCMP_HDR_LEN);
823 return TXRX_CONTINUE;