blob: d6572822076367cdf203207892a2880c7e4487c2 [file] [log] [blame]
Jiri Bencf0706e82007-05-05 11:45:53 -07001/*
2 * Copyright 2002-2004, Instant802 Networks, Inc.
Jouni Malinen765cb462009-01-08 13:32:01 +02003 * Copyright 2008, Jouni Malinen <j@w1.fi>
Jiri Bencf0706e82007-05-05 11:45:53 -07004 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 */
9
10#include <linux/netdevice.h>
11#include <linux/types.h>
Jiri Bencf0706e82007-05-05 11:45:53 -070012#include <linux/skbuff.h>
13#include <linux/compiler.h>
Harvey Harrisonf14df802008-07-02 11:05:35 -070014#include <linux/ieee80211.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090015#include <linux/gfp.h>
Harvey Harrisonf14df802008-07-02 11:05:35 -070016#include <asm/unaligned.h>
Jiri Bencf0706e82007-05-05 11:45:53 -070017#include <net/mac80211.h>
Johannes Bergaba83a0b2011-07-06 21:59:39 +020018#include <crypto/aes.h>
Johannes Bergeb063c12007-08-28 17:01:53 -040019
Jiri Bencf0706e82007-05-05 11:45:53 -070020#include "ieee80211_i.h"
21#include "michael.h"
22#include "tkip.h"
23#include "aes_ccm.h"
Jouni Malinen765cb462009-01-08 13:32:01 +020024#include "aes_cmac.h"
Jiri Bencf0706e82007-05-05 11:45:53 -070025#include "wpa.h"
26
Johannes Berg9ae54c82008-01-31 19:48:20 +010027ieee80211_tx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +010028ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx)
Jiri Bencf0706e82007-05-05 11:45:53 -070029{
Jouni Malinen747d7532011-02-03 18:34:28 +020030 u8 *data, *key, *mic;
Jiri Bencf0706e82007-05-05 11:45:53 -070031 size_t data_len;
Harvey Harrison8e8862b2008-07-02 11:05:35 -070032 unsigned int hdrlen;
33 struct ieee80211_hdr *hdr;
Jiri Bencf0706e82007-05-05 11:45:53 -070034 struct sk_buff *skb = tx->skb;
Johannes Berg813d7662010-01-17 01:47:58 +010035 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Johannes Berg23c07522008-05-29 10:38:53 +020036 int tail;
Jiri Bencf0706e82007-05-05 11:45:53 -070037
Harvey Harrisonc34498b2008-07-02 16:30:52 -070038 hdr = (struct ieee80211_hdr *)skb->data;
Johannes Berg97359d12010-08-10 09:46:38 +020039 if (!tx->key || tx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP ||
40 skb->len < 24 || !ieee80211_is_data_present(hdr->frame_control))
Johannes Berg9ae54c82008-01-31 19:48:20 +010041 return TX_CONTINUE;
Jiri Bencf0706e82007-05-05 11:45:53 -070042
Harvey Harrison8e8862b2008-07-02 11:05:35 -070043 hdrlen = ieee80211_hdrlen(hdr->frame_control);
44 if (skb->len < hdrlen)
Johannes Berg9ae54c82008-01-31 19:48:20 +010045 return TX_DROP;
Jiri Bencf0706e82007-05-05 11:45:53 -070046
Harvey Harrison8e8862b2008-07-02 11:05:35 -070047 data = skb->data + hdrlen;
48 data_len = skb->len - hdrlen;
49
Jouni Malinen681d1192011-02-03 18:35:19 +020050 if (unlikely(info->flags & IEEE80211_TX_INTFL_TKIP_MIC_FAILURE)) {
51 /* Need to use software crypto for the test */
52 info->control.hw_key = NULL;
53 }
54
Johannes Berg813d7662010-01-17 01:47:58 +010055 if (info->control.hw_key &&
Johannes Berga26eb272011-10-07 14:01:25 +020056 (info->flags & IEEE80211_TX_CTL_DONTFRAG ||
57 tx->local->ops->set_frag_threshold) &&
Johannes Berg813d7662010-01-17 01:47:58 +010058 !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC)) {
59 /* hwaccel - with no need for SW-generated MMIC */
Johannes Berg9ae54c82008-01-31 19:48:20 +010060 return TX_CONTINUE;
Jiri Bencf0706e82007-05-05 11:45:53 -070061 }
62
Johannes Berg23c07522008-05-29 10:38:53 +020063 tail = MICHAEL_MIC_LEN;
Johannes Berg813d7662010-01-17 01:47:58 +010064 if (!info->control.hw_key)
Johannes Berg4325f6c2013-05-08 13:09:08 +020065 tail += IEEE80211_TKIP_ICV_LEN;
Johannes Berg23c07522008-05-29 10:38:53 +020066
67 if (WARN_ON(skb_tailroom(skb) < tail ||
Johannes Berg4325f6c2013-05-08 13:09:08 +020068 skb_headroom(skb) < IEEE80211_TKIP_IV_LEN))
Johannes Berg23c07522008-05-29 10:38:53 +020069 return TX_DROP;
Jiri Bencf0706e82007-05-05 11:45:53 -070070
Jouni Malinen747d7532011-02-03 18:34:28 +020071 key = &tx->key->conf.key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY];
Jiri Bencf0706e82007-05-05 11:45:53 -070072 mic = skb_put(skb, MICHAEL_MIC_LEN);
Harvey Harrison8e8862b2008-07-02 11:05:35 -070073 michael_mic(key, hdr, data, data_len, mic);
Jouni Malinen681d1192011-02-03 18:35:19 +020074 if (unlikely(info->flags & IEEE80211_TX_INTFL_TKIP_MIC_FAILURE))
75 mic[0]++;
Jiri Bencf0706e82007-05-05 11:45:53 -070076
Johannes Berg9ae54c82008-01-31 19:48:20 +010077 return TX_CONTINUE;
Jiri Bencf0706e82007-05-05 11:45:53 -070078}
79
80
Johannes Berg9ae54c82008-01-31 19:48:20 +010081ieee80211_rx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +010082ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx)
Jiri Bencf0706e82007-05-05 11:45:53 -070083{
Jouni Malinen747d7532011-02-03 18:34:28 +020084 u8 *data, *key = NULL;
Jiri Bencf0706e82007-05-05 11:45:53 -070085 size_t data_len;
Harvey Harrison8e8862b2008-07-02 11:05:35 -070086 unsigned int hdrlen;
Jiri Bencf0706e82007-05-05 11:45:53 -070087 u8 mic[MICHAEL_MIC_LEN];
88 struct sk_buff *skb = rx->skb;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +010089 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
90 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
Jiri Bencf0706e82007-05-05 11:45:53 -070091
Christian Lamparter816c04f2011-04-30 15:24:30 +020092 /*
93 * it makes no sense to check for MIC errors on anything other
94 * than data frames.
95 */
96 if (!ieee80211_is_data_present(hdr->frame_control))
Johannes Berg9ae54c82008-01-31 19:48:20 +010097 return RX_CONTINUE;
Jiri Bencf0706e82007-05-05 11:45:53 -070098
Christian Lamparter816c04f2011-04-30 15:24:30 +020099 /*
100 * No way to verify the MIC if the hardware stripped it or
101 * the IV with the key index. In this case we have solely rely
102 * on the driver to set RX_FLAG_MMIC_ERROR in the event of a
103 * MIC failure report.
104 */
105 if (status->flag & (RX_FLAG_MMIC_STRIPPED | RX_FLAG_IV_STRIPPED)) {
106 if (status->flag & RX_FLAG_MMIC_ERROR)
Saravanab98ea052012-12-04 19:47:42 +0530107 goto mic_fail_no_key;
Christian Lamparter816c04f2011-04-30 15:24:30 +0200108
Stanislaw Gruszka4045f722012-10-02 21:34:23 +0200109 if (!(status->flag & RX_FLAG_IV_STRIPPED) && rx->key &&
110 rx->key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)
Christian Lamparter816c04f2011-04-30 15:24:30 +0200111 goto update_iv;
112
Johannes Berg9ae54c82008-01-31 19:48:20 +0100113 return RX_CONTINUE;
Christian Lamparter816c04f2011-04-30 15:24:30 +0200114 }
115
116 /*
117 * Some hardware seems to generate Michael MIC failure reports; even
118 * though, the frame was not encrypted with TKIP and therefore has no
119 * MIC. Ignore the flag them to avoid triggering countermeasures.
120 */
121 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP ||
122 !(status->flag & RX_FLAG_DECRYPTED))
123 return RX_CONTINUE;
124
125 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && rx->key->conf.keyidx) {
126 /*
127 * APs with pairwise keys should never receive Michael MIC
128 * errors for non-zero keyidx because these are reserved for
129 * group keys and only the AP is sending real multicast
130 * frames in the BSS. (
131 */
132 return RX_DROP_UNUSABLE;
133 }
134
135 if (status->flag & RX_FLAG_MMIC_ERROR)
136 goto mic_fail;
Jiri Bencf0706e82007-05-05 11:45:53 -0700137
Harvey Harrison8e8862b2008-07-02 11:05:35 -0700138 hdrlen = ieee80211_hdrlen(hdr->frame_control);
139 if (skb->len < hdrlen + MICHAEL_MIC_LEN)
Johannes Berge4c26ad2008-01-31 19:48:21 +0100140 return RX_DROP_UNUSABLE;
Jiri Bencf0706e82007-05-05 11:45:53 -0700141
Johannes Berga8286912012-03-12 13:49:14 +0100142 if (skb_linearize(rx->skb))
143 return RX_DROP_UNUSABLE;
144 hdr = (void *)skb->data;
145
Harvey Harrison8e8862b2008-07-02 11:05:35 -0700146 data = skb->data + hdrlen;
147 data_len = skb->len - hdrlen - MICHAEL_MIC_LEN;
Jouni Malinen747d7532011-02-03 18:34:28 +0200148 key = &rx->key->conf.key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY];
Harvey Harrison8e8862b2008-07-02 11:05:35 -0700149 michael_mic(key, hdr, data, data_len, mic);
Christian Lamparter816c04f2011-04-30 15:24:30 +0200150 if (memcmp(mic, data + data_len, MICHAEL_MIC_LEN) != 0)
151 goto mic_fail;
Jiri Bencf0706e82007-05-05 11:45:53 -0700152
Jiri Bencf0706e82007-05-05 11:45:53 -0700153 /* remove Michael MIC from payload */
154 skb_trim(skb, skb->len - MICHAEL_MIC_LEN);
155
Christian Lamparter816c04f2011-04-30 15:24:30 +0200156update_iv:
Johannes Berg50741ae2007-09-26 15:19:45 +0200157 /* update IV in key information to be able to detect replays */
Johannes Berg9e262972011-07-07 18:45:03 +0200158 rx->key->u.tkip.rx[rx->security_idx].iv32 = rx->tkip_iv32;
159 rx->key->u.tkip.rx[rx->security_idx].iv16 = rx->tkip_iv16;
Johannes Berg50741ae2007-09-26 15:19:45 +0200160
Johannes Berg9ae54c82008-01-31 19:48:20 +0100161 return RX_CONTINUE;
Christian Lamparter816c04f2011-04-30 15:24:30 +0200162
163mic_fail:
Saravanab98ea052012-12-04 19:47:42 +0530164 rx->key->u.tkip.mic_failures++;
165
166mic_fail_no_key:
Arik Nemtsova66b98d2011-06-23 00:00:24 +0300167 /*
168 * In some cases the key can be unset - e.g. a multicast packet, in
169 * a driver that supports HW encryption. Send up the key idx only if
170 * the key is set.
171 */
172 mac80211_ev_michael_mic_failure(rx->sdata,
173 rx->key ? rx->key->conf.keyidx : -1,
Christian Lamparter816c04f2011-04-30 15:24:30 +0200174 (void *) skb->data, NULL, GFP_ATOMIC);
175 return RX_DROP_UNUSABLE;
Jiri Bencf0706e82007-05-05 11:45:53 -0700176}
177
178
Johannes Berge039fa42008-05-15 12:55:29 +0200179static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
Jiri Bencf0706e82007-05-05 11:45:53 -0700180{
181 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
182 struct ieee80211_key *key = tx->key;
Johannes Berge039fa42008-05-15 12:55:29 +0200183 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Harvey Harrisond5184ca2008-06-11 14:21:58 -0700184 unsigned int hdrlen;
185 int len, tail;
Jiri Bencf0706e82007-05-05 11:45:53 -0700186 u8 *pos;
187
Johannes Berg813d7662010-01-17 01:47:58 +0100188 if (info->control.hw_key &&
Janusz.Dziedzic@tieto.comee701082012-05-09 08:11:20 +0300189 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
190 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) {
Johannes Berg813d7662010-01-17 01:47:58 +0100191 /* hwaccel - with no need for software-generated IV */
Johannes Berg23c07522008-05-29 10:38:53 +0200192 return 0;
Johannes Berge039fa42008-05-15 12:55:29 +0200193 }
194
Harvey Harrisond5184ca2008-06-11 14:21:58 -0700195 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Jiri Bencf0706e82007-05-05 11:45:53 -0700196 len = skb->len - hdrlen;
197
Johannes Berg813d7662010-01-17 01:47:58 +0100198 if (info->control.hw_key)
Johannes Berg23c07522008-05-29 10:38:53 +0200199 tail = 0;
Johannes Berg11a843b2007-08-28 17:01:55 -0400200 else
Johannes Berg4325f6c2013-05-08 13:09:08 +0200201 tail = IEEE80211_TKIP_ICV_LEN;
Johannes Berg8f20fc22007-08-28 17:01:54 -0400202
Johannes Berg23c07522008-05-29 10:38:53 +0200203 if (WARN_ON(skb_tailroom(skb) < tail ||
Johannes Berg4325f6c2013-05-08 13:09:08 +0200204 skb_headroom(skb) < IEEE80211_TKIP_IV_LEN))
Johannes Berg23c07522008-05-29 10:38:53 +0200205 return -1;
Jiri Bencf0706e82007-05-05 11:45:53 -0700206
Johannes Berg4325f6c2013-05-08 13:09:08 +0200207 pos = skb_push(skb, IEEE80211_TKIP_IV_LEN);
208 memmove(pos, pos + IEEE80211_TKIP_IV_LEN, hdrlen);
209 skb_set_network_header(skb, skb_network_offset(skb) +
210 IEEE80211_TKIP_IV_LEN);
Jiri Bencf0706e82007-05-05 11:45:53 -0700211 pos += hdrlen;
212
Janusz.Dziedzic@tieto.comee701082012-05-09 08:11:20 +0300213 /* the HW only needs room for the IV, but not the actual IV */
214 if (info->control.hw_key &&
215 (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
216 return 0;
217
Jiri Bencf0706e82007-05-05 11:45:53 -0700218 /* Increase IV for the frame */
Johannes Berg03395002013-02-13 18:03:00 +0100219 spin_lock(&key->u.tkip.txlock);
Harvey Harrisonb0f76b32008-05-14 16:26:19 -0700220 key->u.tkip.tx.iv16++;
221 if (key->u.tkip.tx.iv16 == 0)
222 key->u.tkip.tx.iv32++;
Johannes Berg523b02e2011-07-07 22:28:01 +0200223 pos = ieee80211_tkip_add_iv(pos, key);
Johannes Berg03395002013-02-13 18:03:00 +0100224 spin_unlock(&key->u.tkip.txlock);
Jiri Bencf0706e82007-05-05 11:45:53 -0700225
Johannes Berg813d7662010-01-17 01:47:58 +0100226 /* hwaccel - with software IV */
227 if (info->control.hw_key)
Jiri Bencf0706e82007-05-05 11:45:53 -0700228 return 0;
Jiri Bencf0706e82007-05-05 11:45:53 -0700229
230 /* Add room for ICV */
Johannes Berg4325f6c2013-05-08 13:09:08 +0200231 skb_put(skb, IEEE80211_TKIP_ICV_LEN);
Jiri Bencf0706e82007-05-05 11:45:53 -0700232
John W. Linville34731872010-07-07 15:07:49 -0400233 return ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm,
Johannes Berg523b02e2011-07-07 22:28:01 +0200234 key, skb, pos, len);
Jiri Bencf0706e82007-05-05 11:45:53 -0700235}
236
237
Johannes Berg9ae54c82008-01-31 19:48:20 +0100238ieee80211_tx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100239ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx)
Jiri Bencf0706e82007-05-05 11:45:53 -0700240{
Johannes Berg252b86c2011-11-16 15:28:55 +0100241 struct sk_buff *skb;
Jiri Bencf0706e82007-05-05 11:45:53 -0700242
Johannes Berg5cf121c2008-02-25 16:27:43 +0100243 ieee80211_tx_set_protected(tx);
Jiri Bencf0706e82007-05-05 11:45:53 -0700244
Johannes Berg252b86c2011-11-16 15:28:55 +0100245 skb_queue_walk(&tx->skbs, skb) {
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100246 if (tkip_encrypt_skb(tx, skb) < 0)
247 return TX_DROP;
Johannes Berg252b86c2011-11-16 15:28:55 +0100248 }
Jiri Bencf0706e82007-05-05 11:45:53 -0700249
Johannes Berg9ae54c82008-01-31 19:48:20 +0100250 return TX_CONTINUE;
Jiri Bencf0706e82007-05-05 11:45:53 -0700251}
252
253
Johannes Berg9ae54c82008-01-31 19:48:20 +0100254ieee80211_rx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100255ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx)
Jiri Bencf0706e82007-05-05 11:45:53 -0700256{
257 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
Jouni Malinen747d7532011-02-03 18:34:28 +0200258 int hdrlen, res, hwaccel = 0;
Jiri Bencf0706e82007-05-05 11:45:53 -0700259 struct ieee80211_key *key = rx->key;
260 struct sk_buff *skb = rx->skb;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100261 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Jiri Bencf0706e82007-05-05 11:45:53 -0700262
Harvey Harrisond5184ca2008-06-11 14:21:58 -0700263 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Jiri Bencf0706e82007-05-05 11:45:53 -0700264
Harvey Harrisonc34498b2008-07-02 16:30:52 -0700265 if (!ieee80211_is_data(hdr->frame_control))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100266 return RX_CONTINUE;
Jiri Bencf0706e82007-05-05 11:45:53 -0700267
268 if (!rx->sta || skb->len - hdrlen < 12)
Johannes Berge4c26ad2008-01-31 19:48:21 +0100269 return RX_DROP_UNUSABLE;
Jiri Bencf0706e82007-05-05 11:45:53 -0700270
Johannes Berga8286912012-03-12 13:49:14 +0100271 /* it may be possible to optimize this a bit more */
272 if (skb_linearize(rx->skb))
273 return RX_DROP_UNUSABLE;
274 hdr = (void *)skb->data;
275
Johannes Bergdc1580d2010-08-10 09:46:40 +0200276 /*
277 * Let TKIP code verify IV, but skip decryption.
278 * In the case where hardware checks the IV as well,
279 * we don't even get here, see ieee80211_rx_h_decrypt()
280 */
281 if (status->flag & RX_FLAG_DECRYPTED)
Jiri Bencf0706e82007-05-05 11:45:53 -0700282 hwaccel = 1;
Jiri Bencf0706e82007-05-05 11:45:53 -0700283
284 res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm,
285 key, skb->data + hdrlen,
Johannes Berg17741cd2008-09-11 00:02:02 +0200286 skb->len - hdrlen, rx->sta->sta.addr,
Johannes Berg9e262972011-07-07 18:45:03 +0200287 hdr->addr1, hwaccel, rx->security_idx,
Johannes Berg5cf121c2008-02-25 16:27:43 +0100288 &rx->tkip_iv32,
289 &rx->tkip_iv16);
Jouni Malinen747d7532011-02-03 18:34:28 +0200290 if (res != TKIP_DECRYPT_OK)
Johannes Berge4c26ad2008-01-31 19:48:21 +0100291 return RX_DROP_UNUSABLE;
Jiri Bencf0706e82007-05-05 11:45:53 -0700292
293 /* Trim ICV */
Johannes Berg4325f6c2013-05-08 13:09:08 +0200294 skb_trim(skb, skb->len - IEEE80211_TKIP_ICV_LEN);
Jiri Bencf0706e82007-05-05 11:45:53 -0700295
296 /* Remove IV */
Johannes Berg4325f6c2013-05-08 13:09:08 +0200297 memmove(skb->data + IEEE80211_TKIP_IV_LEN, skb->data, hdrlen);
298 skb_pull(skb, IEEE80211_TKIP_IV_LEN);
Jiri Bencf0706e82007-05-05 11:45:53 -0700299
Johannes Berg9ae54c82008-01-31 19:48:20 +0100300 return RX_CONTINUE;
Jiri Bencf0706e82007-05-05 11:45:53 -0700301}
302
303
Ard Biesheuvel7ec7c4a2013-10-10 09:55:20 +0200304static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad,
Jiri Bencf0706e82007-05-05 11:45:53 -0700305 int encrypted)
306{
Harvey Harrisonf14df802008-07-02 11:05:35 -0700307 __le16 mask_fc;
Jouni Malinenfb733332009-01-08 13:32:00 +0200308 int a4_included, mgmt;
Harvey Harrisonf14df802008-07-02 11:05:35 -0700309 u8 qos_tid;
Ard Biesheuvel7ec7c4a2013-10-10 09:55:20 +0200310 u16 len_a;
Harvey Harrisonf14df802008-07-02 11:05:35 -0700311 unsigned int hdrlen;
312 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
Jiri Bencf0706e82007-05-05 11:45:53 -0700313
Harvey Harrisonf14df802008-07-02 11:05:35 -0700314 /*
Jouni Malinenfb733332009-01-08 13:32:00 +0200315 * Mask FC: zero subtype b4 b5 b6 (if not mgmt)
Harvey Harrisonf14df802008-07-02 11:05:35 -0700316 * Retry, PwrMgt, MoreData; set Protected
317 */
Jouni Malinenfb733332009-01-08 13:32:00 +0200318 mgmt = ieee80211_is_mgmt(hdr->frame_control);
Harvey Harrisonf14df802008-07-02 11:05:35 -0700319 mask_fc = hdr->frame_control;
Jouni Malinenfb733332009-01-08 13:32:00 +0200320 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY |
Harvey Harrisonf14df802008-07-02 11:05:35 -0700321 IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA);
Jouni Malinenfb733332009-01-08 13:32:00 +0200322 if (!mgmt)
323 mask_fc &= ~cpu_to_le16(0x0070);
Harvey Harrisonf14df802008-07-02 11:05:35 -0700324 mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
Jiri Bencf0706e82007-05-05 11:45:53 -0700325
Harvey Harrisonf14df802008-07-02 11:05:35 -0700326 hdrlen = ieee80211_hdrlen(hdr->frame_control);
327 len_a = hdrlen - 2;
328 a4_included = ieee80211_has_a4(hdr->frame_control);
329
330 if (ieee80211_is_data_qos(hdr->frame_control))
331 qos_tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
332 else
333 qos_tid = 0;
334
Ard Biesheuvel7ec7c4a2013-10-10 09:55:20 +0200335 /* In CCM, the initial vectors (IV) used for CTR mode encryption and CBC
336 * mode authentication are not allowed to collide, yet both are derived
337 * from this vector b_0. We only set L := 1 here to indicate that the
338 * data size can be represented in (L+1) bytes. The CCM layer will take
339 * care of storing the data length in the top (L+1) bytes and setting
340 * and clearing the other bits as is required to derive the two IVs.
341 */
342 b_0[0] = 0x1;
Harvey Harrisonf14df802008-07-02 11:05:35 -0700343
Jouni Malinenfb733332009-01-08 13:32:00 +0200344 /* Nonce: Nonce Flags | A2 | PN
345 * Nonce Flags: Priority (b0..b3) | Management (b4) | Reserved (b5..b7)
346 */
347 b_0[1] = qos_tid | (mgmt << 4);
Harvey Harrison73e1f7c2008-07-02 11:05:34 -0700348 memcpy(&b_0[2], hdr->addr2, ETH_ALEN);
Johannes Berg4325f6c2013-05-08 13:09:08 +0200349 memcpy(&b_0[8], pn, IEEE80211_CCMP_PN_LEN);
Jiri Bencf0706e82007-05-05 11:45:53 -0700350
351 /* AAD (extra authenticate-only data) / masked 802.11 header
352 * FC | A1 | A2 | A3 | SC | [A4] | [QC] */
Harvey Harrisonf14df802008-07-02 11:05:35 -0700353 put_unaligned_be16(len_a, &aad[0]);
354 put_unaligned(mask_fc, (__le16 *)&aad[2]);
Harvey Harrison73e1f7c2008-07-02 11:05:34 -0700355 memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN);
Jiri Bencf0706e82007-05-05 11:45:53 -0700356
357 /* Mask Seq#, leave Frag# */
358 aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f;
359 aad[23] = 0;
Harvey Harrisonf14df802008-07-02 11:05:35 -0700360
Jiri Bencf0706e82007-05-05 11:45:53 -0700361 if (a4_included) {
Harvey Harrison73e1f7c2008-07-02 11:05:34 -0700362 memcpy(&aad[24], hdr->addr4, ETH_ALEN);
Harvey Harrisonf14df802008-07-02 11:05:35 -0700363 aad[30] = qos_tid;
Jiri Bencf0706e82007-05-05 11:45:53 -0700364 aad[31] = 0;
Harvey Harrisonf14df802008-07-02 11:05:35 -0700365 } else {
Harvey Harrison73e1f7c2008-07-02 11:05:34 -0700366 memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
Harvey Harrisonf14df802008-07-02 11:05:35 -0700367 aad[24] = qos_tid;
Jiri Bencf0706e82007-05-05 11:45:53 -0700368 }
369}
370
371
372static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn, int key_id)
373{
374 hdr[0] = pn[5];
375 hdr[1] = pn[4];
376 hdr[2] = 0;
377 hdr[3] = 0x20 | (key_id << 6);
378 hdr[4] = pn[3];
379 hdr[5] = pn[2];
380 hdr[6] = pn[1];
381 hdr[7] = pn[0];
382}
383
384
Johannes Bergc6a1fa12008-10-07 12:04:32 +0200385static inline void ccmp_hdr2pn(u8 *pn, u8 *hdr)
Jiri Bencf0706e82007-05-05 11:45:53 -0700386{
387 pn[0] = hdr[7];
388 pn[1] = hdr[6];
389 pn[2] = hdr[5];
390 pn[3] = hdr[4];
391 pn[4] = hdr[1];
392 pn[5] = hdr[0];
Jiri Bencf0706e82007-05-05 11:45:53 -0700393}
394
395
Johannes Berge039fa42008-05-15 12:55:29 +0200396static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
Jiri Bencf0706e82007-05-05 11:45:53 -0700397{
398 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
399 struct ieee80211_key *key = tx->key;
Johannes Berge039fa42008-05-15 12:55:29 +0200400 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Johannes Berg23c07522008-05-29 10:38:53 +0200401 int hdrlen, len, tail;
Johannes Bergaba83a0b2011-07-06 21:59:39 +0200402 u8 *pos;
403 u8 pn[6];
404 u64 pn64;
Ard Biesheuvel7ec7c4a2013-10-10 09:55:20 +0200405 u8 aad[2 * AES_BLOCK_SIZE];
406 u8 b_0[AES_BLOCK_SIZE];
Jouni Malinen1f7d77a2009-01-08 13:32:10 +0200407
Johannes Berg813d7662010-01-17 01:47:58 +0100408 if (info->control.hw_key &&
Arik Nemtsov077a9152011-10-23 08:21:41 +0200409 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
410 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) {
Johannes Berg813d7662010-01-17 01:47:58 +0100411 /*
412 * hwaccel has no need for preallocated room for CCMP
413 * header or MIC fields
414 */
Johannes Berg23c07522008-05-29 10:38:53 +0200415 return 0;
Johannes Berge039fa42008-05-15 12:55:29 +0200416 }
417
Harvey Harrisond5184ca2008-06-11 14:21:58 -0700418 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Jiri Bencf0706e82007-05-05 11:45:53 -0700419 len = skb->len - hdrlen;
420
Johannes Berg813d7662010-01-17 01:47:58 +0100421 if (info->control.hw_key)
Johannes Berg23c07522008-05-29 10:38:53 +0200422 tail = 0;
Johannes Berg11a843b2007-08-28 17:01:55 -0400423 else
Johannes Berg4325f6c2013-05-08 13:09:08 +0200424 tail = IEEE80211_CCMP_MIC_LEN;
Jiri Bencf0706e82007-05-05 11:45:53 -0700425
Johannes Berg23c07522008-05-29 10:38:53 +0200426 if (WARN_ON(skb_tailroom(skb) < tail ||
Johannes Berg4325f6c2013-05-08 13:09:08 +0200427 skb_headroom(skb) < IEEE80211_CCMP_HDR_LEN))
Johannes Berg23c07522008-05-29 10:38:53 +0200428 return -1;
Jiri Bencf0706e82007-05-05 11:45:53 -0700429
Johannes Berg4325f6c2013-05-08 13:09:08 +0200430 pos = skb_push(skb, IEEE80211_CCMP_HDR_LEN);
431 memmove(pos, pos + IEEE80211_CCMP_HDR_LEN, hdrlen);
432 skb_set_network_header(skb, skb_network_offset(skb) +
433 IEEE80211_CCMP_HDR_LEN);
Arik Nemtsov077a9152011-10-23 08:21:41 +0200434
435 /* the HW only needs room for the IV, but not the actual IV */
Arik Nemtsove0830f72011-11-10 09:35:13 +0200436 if (info->control.hw_key &&
437 (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
Arik Nemtsov077a9152011-10-23 08:21:41 +0200438 return 0;
439
Jiri Bencf0706e82007-05-05 11:45:53 -0700440 hdr = (struct ieee80211_hdr *) pos;
441 pos += hdrlen;
442
Johannes Bergaba83a0b2011-07-06 21:59:39 +0200443 pn64 = atomic64_inc_return(&key->u.ccmp.tx_pn);
Jiri Bencf0706e82007-05-05 11:45:53 -0700444
Johannes Bergaba83a0b2011-07-06 21:59:39 +0200445 pn[5] = pn64;
446 pn[4] = pn64 >> 8;
447 pn[3] = pn64 >> 16;
448 pn[2] = pn64 >> 24;
449 pn[1] = pn64 >> 32;
450 pn[0] = pn64 >> 40;
Jiri Bencf0706e82007-05-05 11:45:53 -0700451
Johannes Berg8f20fc22007-08-28 17:01:54 -0400452 ccmp_pn2hdr(pos, pn, key->conf.keyidx);
Jiri Bencf0706e82007-05-05 11:45:53 -0700453
Johannes Berg813d7662010-01-17 01:47:58 +0100454 /* hwaccel - with software CCMP header */
455 if (info->control.hw_key)
Jiri Bencf0706e82007-05-05 11:45:53 -0700456 return 0;
Jiri Bencf0706e82007-05-05 11:45:53 -0700457
Johannes Berg4325f6c2013-05-08 13:09:08 +0200458 pos += IEEE80211_CCMP_HDR_LEN;
Ard Biesheuvel7ec7c4a2013-10-10 09:55:20 +0200459 ccmp_special_blocks(skb, pn, b_0, aad, 0);
460 ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, b_0, aad, pos, len,
461 skb_put(skb, IEEE80211_CCMP_MIC_LEN));
Jiri Bencf0706e82007-05-05 11:45:53 -0700462
463 return 0;
464}
465
466
Johannes Berg9ae54c82008-01-31 19:48:20 +0100467ieee80211_tx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100468ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx)
Jiri Bencf0706e82007-05-05 11:45:53 -0700469{
Johannes Berg252b86c2011-11-16 15:28:55 +0100470 struct sk_buff *skb;
Jiri Bencf0706e82007-05-05 11:45:53 -0700471
Johannes Berg5cf121c2008-02-25 16:27:43 +0100472 ieee80211_tx_set_protected(tx);
Jiri Bencf0706e82007-05-05 11:45:53 -0700473
Johannes Berg252b86c2011-11-16 15:28:55 +0100474 skb_queue_walk(&tx->skbs, skb) {
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100475 if (ccmp_encrypt_skb(tx, skb) < 0)
476 return TX_DROP;
Johannes Berg252b86c2011-11-16 15:28:55 +0100477 }
Jiri Bencf0706e82007-05-05 11:45:53 -0700478
Johannes Berg9ae54c82008-01-31 19:48:20 +0100479 return TX_CONTINUE;
Jiri Bencf0706e82007-05-05 11:45:53 -0700480}
481
482
Johannes Berg9ae54c82008-01-31 19:48:20 +0100483ieee80211_rx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100484ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx)
Jiri Bencf0706e82007-05-05 11:45:53 -0700485{
Harvey Harrisonc34498b2008-07-02 16:30:52 -0700486 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Jiri Bencf0706e82007-05-05 11:45:53 -0700487 int hdrlen;
488 struct ieee80211_key *key = rx->key;
489 struct sk_buff *skb = rx->skb;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100490 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg4325f6c2013-05-08 13:09:08 +0200491 u8 pn[IEEE80211_CCMP_PN_LEN];
Jiri Bencf0706e82007-05-05 11:45:53 -0700492 int data_len;
Jouni Malinen91902522010-06-11 10:27:33 -0700493 int queue;
Jiri Bencf0706e82007-05-05 11:45:53 -0700494
Harvey Harrisond5184ca2008-06-11 14:21:58 -0700495 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Jiri Bencf0706e82007-05-05 11:45:53 -0700496
Jouni Malinenfb733332009-01-08 13:32:00 +0200497 if (!ieee80211_is_data(hdr->frame_control) &&
498 !ieee80211_is_robust_mgmt_frame(hdr))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100499 return RX_CONTINUE;
Jiri Bencf0706e82007-05-05 11:45:53 -0700500
Johannes Berg4325f6c2013-05-08 13:09:08 +0200501 data_len = skb->len - hdrlen - IEEE80211_CCMP_HDR_LEN -
502 IEEE80211_CCMP_MIC_LEN;
Jiri Bencf0706e82007-05-05 11:45:53 -0700503 if (!rx->sta || data_len < 0)
Johannes Berge4c26ad2008-01-31 19:48:21 +0100504 return RX_DROP_UNUSABLE;
Jiri Bencf0706e82007-05-05 11:45:53 -0700505
Johannes Berga8286912012-03-12 13:49:14 +0100506 if (status->flag & RX_FLAG_DECRYPTED) {
Johannes Berg4325f6c2013-05-08 13:09:08 +0200507 if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_CCMP_HDR_LEN))
Johannes Berga8286912012-03-12 13:49:14 +0100508 return RX_DROP_UNUSABLE;
509 } else {
510 if (skb_linearize(rx->skb))
511 return RX_DROP_UNUSABLE;
512 }
513
Johannes Bergc6a1fa12008-10-07 12:04:32 +0200514 ccmp_hdr2pn(pn, skb->data + hdrlen);
Jiri Bencf0706e82007-05-05 11:45:53 -0700515
Johannes Berg9e262972011-07-07 18:45:03 +0200516 queue = rx->security_idx;
Jouni Malinen91902522010-06-11 10:27:33 -0700517
Johannes Berg4325f6c2013-05-08 13:09:08 +0200518 if (memcmp(pn, key->u.ccmp.rx_pn[queue], IEEE80211_CCMP_PN_LEN) <= 0) {
Jiri Bencf0706e82007-05-05 11:45:53 -0700519 key->u.ccmp.replays++;
Johannes Berge4c26ad2008-01-31 19:48:21 +0100520 return RX_DROP_UNUSABLE;
Jiri Bencf0706e82007-05-05 11:45:53 -0700521 }
522
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100523 if (!(status->flag & RX_FLAG_DECRYPTED)) {
Ard Biesheuvel7ec7c4a2013-10-10 09:55:20 +0200524 u8 aad[2 * AES_BLOCK_SIZE];
525 u8 b_0[AES_BLOCK_SIZE];
Johannes Berg7848ba72007-09-14 11:10:25 -0400526 /* hardware didn't decrypt/verify MIC */
Ard Biesheuvel7ec7c4a2013-10-10 09:55:20 +0200527 ccmp_special_blocks(skb, pn, b_0, aad, 1);
Jiri Bencf0706e82007-05-05 11:45:53 -0700528
529 if (ieee80211_aes_ccm_decrypt(
Ard Biesheuvel7ec7c4a2013-10-10 09:55:20 +0200530 key->u.ccmp.tfm, b_0, aad,
Johannes Berg4325f6c2013-05-08 13:09:08 +0200531 skb->data + hdrlen + IEEE80211_CCMP_HDR_LEN,
532 data_len,
Ard Biesheuvel7ec7c4a2013-10-10 09:55:20 +0200533 skb->data + skb->len - IEEE80211_CCMP_MIC_LEN))
Johannes Berge4c26ad2008-01-31 19:48:21 +0100534 return RX_DROP_UNUSABLE;
Jiri Bencf0706e82007-05-05 11:45:53 -0700535 }
536
Johannes Berg4325f6c2013-05-08 13:09:08 +0200537 memcpy(key->u.ccmp.rx_pn[queue], pn, IEEE80211_CCMP_PN_LEN);
Jiri Bencf0706e82007-05-05 11:45:53 -0700538
539 /* Remove CCMP header and MIC */
Johannes Berg4325f6c2013-05-08 13:09:08 +0200540 if (pskb_trim(skb, skb->len - IEEE80211_CCMP_MIC_LEN))
Johannes Berga8286912012-03-12 13:49:14 +0100541 return RX_DROP_UNUSABLE;
Johannes Berg4325f6c2013-05-08 13:09:08 +0200542 memmove(skb->data + IEEE80211_CCMP_HDR_LEN, skb->data, hdrlen);
543 skb_pull(skb, IEEE80211_CCMP_HDR_LEN);
Jiri Bencf0706e82007-05-05 11:45:53 -0700544
Johannes Berg9ae54c82008-01-31 19:48:20 +0100545 return RX_CONTINUE;
Jiri Bencf0706e82007-05-05 11:45:53 -0700546}
Jouni Malinen765cb462009-01-08 13:32:01 +0200547
548
549static void bip_aad(struct sk_buff *skb, u8 *aad)
550{
Jouni Malinen337663682012-09-30 19:47:40 +0300551 __le16 mask_fc;
552 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
553
Jouni Malinen765cb462009-01-08 13:32:01 +0200554 /* BIP AAD: FC(masked) || A1 || A2 || A3 */
555
556 /* FC type/subtype */
Jouni Malinen765cb462009-01-08 13:32:01 +0200557 /* Mask FC Retry, PwrMgt, MoreData flags to zero */
Jouni Malinen337663682012-09-30 19:47:40 +0300558 mask_fc = hdr->frame_control;
559 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | IEEE80211_FCTL_PM |
560 IEEE80211_FCTL_MOREDATA);
561 put_unaligned(mask_fc, (__le16 *) &aad[0]);
Jouni Malinen765cb462009-01-08 13:32:01 +0200562 /* A1 || A2 || A3 */
Jouni Malinen337663682012-09-30 19:47:40 +0300563 memcpy(aad + 2, &hdr->addr1, 3 * ETH_ALEN);
Jouni Malinen765cb462009-01-08 13:32:01 +0200564}
565
566
Johannes Berg75396ae2011-07-06 22:00:35 +0200567static inline void bip_ipn_set64(u8 *d, u64 pn)
568{
569 *d++ = pn;
570 *d++ = pn >> 8;
571 *d++ = pn >> 16;
572 *d++ = pn >> 24;
573 *d++ = pn >> 32;
574 *d = pn >> 40;
575}
576
Jouni Malinen765cb462009-01-08 13:32:01 +0200577static inline void bip_ipn_swap(u8 *d, const u8 *s)
578{
579 *d++ = s[5];
580 *d++ = s[4];
581 *d++ = s[3];
582 *d++ = s[2];
583 *d++ = s[1];
584 *d = s[0];
585}
586
587
588ieee80211_tx_result
589ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx)
590{
Johannes Berg252b86c2011-11-16 15:28:55 +0100591 struct sk_buff *skb;
592 struct ieee80211_tx_info *info;
Jouni Malinen765cb462009-01-08 13:32:01 +0200593 struct ieee80211_key *key = tx->key;
594 struct ieee80211_mmie *mmie;
Johannes Berg75396ae2011-07-06 22:00:35 +0200595 u8 aad[20];
596 u64 pn64;
Jouni Malinen765cb462009-01-08 13:32:01 +0200597
Johannes Berg252b86c2011-11-16 15:28:55 +0100598 if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
599 return TX_DROP;
600
601 skb = skb_peek(&tx->skbs);
602
603 info = IEEE80211_SKB_CB(skb);
604
Johannes Berg813d7662010-01-17 01:47:58 +0100605 if (info->control.hw_key)
Johannes Berg252b86c2011-11-16 15:28:55 +0100606 return TX_CONTINUE;
Jouni Malinen765cb462009-01-08 13:32:01 +0200607
608 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
609 return TX_DROP;
610
611 mmie = (struct ieee80211_mmie *) skb_put(skb, sizeof(*mmie));
612 mmie->element_id = WLAN_EID_MMIE;
613 mmie->length = sizeof(*mmie) - 2;
614 mmie->key_id = cpu_to_le16(key->conf.keyidx);
615
616 /* PN = PN + 1 */
Johannes Berg75396ae2011-07-06 22:00:35 +0200617 pn64 = atomic64_inc_return(&key->u.aes_cmac.tx_pn);
Jouni Malinen765cb462009-01-08 13:32:01 +0200618
Johannes Berg75396ae2011-07-06 22:00:35 +0200619 bip_ipn_set64(mmie->sequence_number, pn64);
Jouni Malinen765cb462009-01-08 13:32:01 +0200620
621 bip_aad(skb, aad);
622
623 /*
624 * MIC = AES-128-CMAC(IGTK, AAD || Management Frame Body || MMIE, 64)
625 */
Johannes Berg75396ae2011-07-06 22:00:35 +0200626 ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad,
627 skb->data + 24, skb->len - 24, mmie->mic);
Jouni Malinen765cb462009-01-08 13:32:01 +0200628
629 return TX_CONTINUE;
630}
631
632
633ieee80211_rx_result
634ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx)
635{
636 struct sk_buff *skb = rx->skb;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100637 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Jouni Malinen765cb462009-01-08 13:32:01 +0200638 struct ieee80211_key *key = rx->key;
639 struct ieee80211_mmie *mmie;
640 u8 aad[20], mic[8], ipn[6];
641 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
642
643 if (!ieee80211_is_mgmt(hdr->frame_control))
644 return RX_CONTINUE;
645
Johannes Berga8286912012-03-12 13:49:14 +0100646 /* management frames are already linear */
647
Jouni Malinen765cb462009-01-08 13:32:01 +0200648 if (skb->len < 24 + sizeof(*mmie))
649 return RX_DROP_UNUSABLE;
650
651 mmie = (struct ieee80211_mmie *)
652 (skb->data + skb->len - sizeof(*mmie));
653 if (mmie->element_id != WLAN_EID_MMIE ||
654 mmie->length != sizeof(*mmie) - 2)
655 return RX_DROP_UNUSABLE; /* Invalid MMIE */
656
657 bip_ipn_swap(ipn, mmie->sequence_number);
658
659 if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) {
660 key->u.aes_cmac.replays++;
661 return RX_DROP_UNUSABLE;
662 }
663
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100664 if (!(status->flag & RX_FLAG_DECRYPTED)) {
Jouni Malinen765cb462009-01-08 13:32:01 +0200665 /* hardware didn't decrypt/verify MIC */
666 bip_aad(skb, aad);
Johannes Berg75396ae2011-07-06 22:00:35 +0200667 ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad,
Jouni Malinen765cb462009-01-08 13:32:01 +0200668 skb->data + 24, skb->len - 24, mic);
669 if (memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) {
670 key->u.aes_cmac.icverrors++;
671 return RX_DROP_UNUSABLE;
672 }
673 }
674
675 memcpy(key->u.aes_cmac.rx_pn, ipn, 6);
676
677 /* Remove MMIE */
678 skb_trim(skb, skb->len - sizeof(*mmie));
679
680 return RX_CONTINUE;
681}
Yoni Divinskyd32a1022012-01-16 15:18:59 +0200682
683ieee80211_tx_result
684ieee80211_crypto_hw_encrypt(struct ieee80211_tx_data *tx)
685{
686 struct sk_buff *skb;
687 struct ieee80211_tx_info *info = NULL;
688
689 skb_queue_walk(&tx->skbs, skb) {
690 info = IEEE80211_SKB_CB(skb);
691
692 /* handle hw-only algorithm */
693 if (!info->control.hw_key)
694 return TX_DROP;
695 }
696
697 ieee80211_tx_set_protected(tx);
698
699 return TX_CONTINUE;
700}