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Jiri Bencf0706e822007-05-05 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 Bencf0706e822007-05-05 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 Bencf0706e822007-05-05 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 Bencf0706e822007-05-05 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 Bencf0706e822007-05-05 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 Bencf0706e822007-05-05 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 Bencf0706e822007-05-05 11:45:53 -070029{
Jouni Malinen747d7532011-02-03 18:34:28 +020030 u8 *data, *key, *mic;
Jiri Bencf0706e822007-05-05 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 Bencf0706e822007-05-05 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 Bencf0706e822007-05-05 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 Bencf0706e822007-05-05 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 Bencf0706e822007-05-05 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 Bencf0706e822007-05-05 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 Berg23c07522008-05-29 10:38:53 +020065 tail += TKIP_ICV_LEN;
66
67 if (WARN_ON(skb_tailroom(skb) < tail ||
68 skb_headroom(skb) < TKIP_IV_LEN))
69 return TX_DROP;
Jiri Bencf0706e822007-05-05 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 Bencf0706e822007-05-05 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 Bencf0706e822007-05-05 11:45:53 -070076
Johannes Berg9ae54c82008-01-31 19:48:20 +010077 return TX_CONTINUE;
Jiri Bencf0706e822007-05-05 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 Bencf0706e822007-05-05 11:45:53 -070083{
Jouni Malinen747d7532011-02-03 18:34:28 +020084 u8 *data, *key = NULL;
Jiri Bencf0706e822007-05-05 11:45:53 -070085 size_t data_len;
Harvey Harrison8e8862b2008-07-02 11:05:35 -070086 unsigned int hdrlen;
Jiri Bencf0706e822007-05-05 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 Bencf0706e822007-05-05 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 Bencf0706e822007-05-05 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)
107 goto mic_fail;
108
Stanislaw Gruszka0c5dffc2012-10-02 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 Bencf0706e822007-05-05 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 Bencf0706e822007-05-05 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 Bencf0706e822007-05-05 11:45:53 -0700152
Jiri Bencf0706e822007-05-05 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:
Arik Nemtsova66b98d2011-06-23 00:00:24 +0300164 /*
165 * In some cases the key can be unset - e.g. a multicast packet, in
166 * a driver that supports HW encryption. Send up the key idx only if
167 * the key is set.
168 */
169 mac80211_ev_michael_mic_failure(rx->sdata,
170 rx->key ? rx->key->conf.keyidx : -1,
Christian Lamparter816c04f2011-04-30 15:24:30 +0200171 (void *) skb->data, NULL, GFP_ATOMIC);
172 return RX_DROP_UNUSABLE;
Jiri Bencf0706e822007-05-05 11:45:53 -0700173}
174
175
Johannes Berge039fa42008-05-15 12:55:29 +0200176static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
Jiri Bencf0706e822007-05-05 11:45:53 -0700177{
178 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
179 struct ieee80211_key *key = tx->key;
Johannes Berge039fa42008-05-15 12:55:29 +0200180 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Johannes Berg523b02e2011-07-07 22:28:01 +0200181 unsigned long flags;
Harvey Harrisond5184ca2008-06-11 14:21:58 -0700182 unsigned int hdrlen;
183 int len, tail;
Jiri Bencf0706e822007-05-05 11:45:53 -0700184 u8 *pos;
185
Johannes Berg813d7662010-01-17 01:47:58 +0100186 if (info->control.hw_key &&
187 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV)) {
188 /* hwaccel - with no need for software-generated IV */
Johannes Berg23c07522008-05-29 10:38:53 +0200189 return 0;
Johannes Berge039fa42008-05-15 12:55:29 +0200190 }
191
Harvey Harrisond5184ca2008-06-11 14:21:58 -0700192 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Jiri Bencf0706e822007-05-05 11:45:53 -0700193 len = skb->len - hdrlen;
194
Johannes Berg813d7662010-01-17 01:47:58 +0100195 if (info->control.hw_key)
Johannes Berg23c07522008-05-29 10:38:53 +0200196 tail = 0;
Johannes Berg11a843b2007-08-28 17:01:55 -0400197 else
Johannes Berg23c07522008-05-29 10:38:53 +0200198 tail = TKIP_ICV_LEN;
Johannes Berg8f20fc22007-08-28 17:01:54 -0400199
Johannes Berg23c07522008-05-29 10:38:53 +0200200 if (WARN_ON(skb_tailroom(skb) < tail ||
201 skb_headroom(skb) < TKIP_IV_LEN))
202 return -1;
Jiri Bencf0706e822007-05-05 11:45:53 -0700203
204 pos = skb_push(skb, TKIP_IV_LEN);
205 memmove(pos, pos + TKIP_IV_LEN, hdrlen);
206 pos += hdrlen;
207
208 /* Increase IV for the frame */
Johannes Berg523b02e2011-07-07 22:28:01 +0200209 spin_lock_irqsave(&key->u.tkip.txlock, flags);
Harvey Harrisonb0f76b32008-05-14 16:26:19 -0700210 key->u.tkip.tx.iv16++;
211 if (key->u.tkip.tx.iv16 == 0)
212 key->u.tkip.tx.iv32++;
Johannes Berg523b02e2011-07-07 22:28:01 +0200213 pos = ieee80211_tkip_add_iv(pos, key);
214 spin_unlock_irqrestore(&key->u.tkip.txlock, flags);
Jiri Bencf0706e822007-05-05 11:45:53 -0700215
Johannes Berg813d7662010-01-17 01:47:58 +0100216 /* hwaccel - with software IV */
217 if (info->control.hw_key)
Jiri Bencf0706e822007-05-05 11:45:53 -0700218 return 0;
Jiri Bencf0706e822007-05-05 11:45:53 -0700219
220 /* Add room for ICV */
221 skb_put(skb, TKIP_ICV_LEN);
222
John W. Linville34731872010-07-07 15:07:49 -0400223 return ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm,
Johannes Berg523b02e2011-07-07 22:28:01 +0200224 key, skb, pos, len);
Jiri Bencf0706e822007-05-05 11:45:53 -0700225}
226
227
Johannes Berg9ae54c82008-01-31 19:48:20 +0100228ieee80211_tx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100229ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx)
Jiri Bencf0706e822007-05-05 11:45:53 -0700230{
Johannes Berg252b86c2011-11-16 15:28:55 +0100231 struct sk_buff *skb;
Jiri Bencf0706e822007-05-05 11:45:53 -0700232
Johannes Berg5cf121c2008-02-25 16:27:43 +0100233 ieee80211_tx_set_protected(tx);
Jiri Bencf0706e822007-05-05 11:45:53 -0700234
Johannes Berg252b86c2011-11-16 15:28:55 +0100235 skb_queue_walk(&tx->skbs, skb) {
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100236 if (tkip_encrypt_skb(tx, skb) < 0)
237 return TX_DROP;
Johannes Berg252b86c2011-11-16 15:28:55 +0100238 }
Jiri Bencf0706e822007-05-05 11:45:53 -0700239
Johannes Berg9ae54c82008-01-31 19:48:20 +0100240 return TX_CONTINUE;
Jiri Bencf0706e822007-05-05 11:45:53 -0700241}
242
243
Johannes Berg9ae54c82008-01-31 19:48:20 +0100244ieee80211_rx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100245ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx)
Jiri Bencf0706e822007-05-05 11:45:53 -0700246{
247 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
Jouni Malinen747d7532011-02-03 18:34:28 +0200248 int hdrlen, res, hwaccel = 0;
Jiri Bencf0706e822007-05-05 11:45:53 -0700249 struct ieee80211_key *key = rx->key;
250 struct sk_buff *skb = rx->skb;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100251 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Jiri Bencf0706e822007-05-05 11:45:53 -0700252
Harvey Harrisond5184ca2008-06-11 14:21:58 -0700253 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Jiri Bencf0706e822007-05-05 11:45:53 -0700254
Harvey Harrisonc34498b2008-07-02 16:30:52 -0700255 if (!ieee80211_is_data(hdr->frame_control))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100256 return RX_CONTINUE;
Jiri Bencf0706e822007-05-05 11:45:53 -0700257
258 if (!rx->sta || skb->len - hdrlen < 12)
Johannes Berge4c26ad2008-01-31 19:48:21 +0100259 return RX_DROP_UNUSABLE;
Jiri Bencf0706e822007-05-05 11:45:53 -0700260
Johannes Berga8286912012-03-12 13:49:14 +0100261 /* it may be possible to optimize this a bit more */
262 if (skb_linearize(rx->skb))
263 return RX_DROP_UNUSABLE;
264 hdr = (void *)skb->data;
265
Johannes Bergdc1580d2010-08-10 09:46:40 +0200266 /*
267 * Let TKIP code verify IV, but skip decryption.
268 * In the case where hardware checks the IV as well,
269 * we don't even get here, see ieee80211_rx_h_decrypt()
270 */
271 if (status->flag & RX_FLAG_DECRYPTED)
Jiri Bencf0706e822007-05-05 11:45:53 -0700272 hwaccel = 1;
Jiri Bencf0706e822007-05-05 11:45:53 -0700273
274 res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm,
275 key, skb->data + hdrlen,
Johannes Berg17741cd2008-09-11 00:02:02 +0200276 skb->len - hdrlen, rx->sta->sta.addr,
Johannes Berg9e262972011-07-07 18:45:03 +0200277 hdr->addr1, hwaccel, rx->security_idx,
Johannes Berg5cf121c2008-02-25 16:27:43 +0100278 &rx->tkip_iv32,
279 &rx->tkip_iv16);
Jouni Malinen747d7532011-02-03 18:34:28 +0200280 if (res != TKIP_DECRYPT_OK)
Johannes Berge4c26ad2008-01-31 19:48:21 +0100281 return RX_DROP_UNUSABLE;
Jiri Bencf0706e822007-05-05 11:45:53 -0700282
283 /* Trim ICV */
284 skb_trim(skb, skb->len - TKIP_ICV_LEN);
285
286 /* Remove IV */
287 memmove(skb->data + TKIP_IV_LEN, skb->data, hdrlen);
288 skb_pull(skb, TKIP_IV_LEN);
289
Johannes Berg9ae54c82008-01-31 19:48:20 +0100290 return RX_CONTINUE;
Jiri Bencf0706e822007-05-05 11:45:53 -0700291}
292
293
Harvey Harrisonfeccb462008-07-02 16:30:52 -0700294static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *scratch,
Jiri Bencf0706e822007-05-05 11:45:53 -0700295 int encrypted)
296{
Harvey Harrisonf14df802008-07-02 11:05:35 -0700297 __le16 mask_fc;
Jouni Malinenfb733332009-01-08 13:32:00 +0200298 int a4_included, mgmt;
Harvey Harrisonf14df802008-07-02 11:05:35 -0700299 u8 qos_tid;
Harvey Harrisonfeccb462008-07-02 16:30:52 -0700300 u8 *b_0, *aad;
Harvey Harrisonf14df802008-07-02 11:05:35 -0700301 u16 data_len, len_a;
302 unsigned int hdrlen;
303 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
Jiri Bencf0706e822007-05-05 11:45:53 -0700304
Johannes Berg0cd20a22011-07-06 22:02:14 +0200305 memset(scratch, 0, 6 * AES_BLOCK_SIZE);
Johannes Bergaba83a0b2011-07-06 21:59:39 +0200306
Johannes Berg0cd20a22011-07-06 22:02:14 +0200307 b_0 = scratch + 3 * AES_BLOCK_SIZE;
308 aad = scratch + 4 * AES_BLOCK_SIZE;
Harvey Harrisonfeccb462008-07-02 16:30:52 -0700309
Harvey Harrisonf14df802008-07-02 11:05:35 -0700310 /*
Jouni Malinenfb733332009-01-08 13:32:00 +0200311 * Mask FC: zero subtype b4 b5 b6 (if not mgmt)
Harvey Harrisonf14df802008-07-02 11:05:35 -0700312 * Retry, PwrMgt, MoreData; set Protected
313 */
Jouni Malinenfb733332009-01-08 13:32:00 +0200314 mgmt = ieee80211_is_mgmt(hdr->frame_control);
Harvey Harrisonf14df802008-07-02 11:05:35 -0700315 mask_fc = hdr->frame_control;
Jouni Malinenfb733332009-01-08 13:32:00 +0200316 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY |
Harvey Harrisonf14df802008-07-02 11:05:35 -0700317 IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA);
Jouni Malinenfb733332009-01-08 13:32:00 +0200318 if (!mgmt)
319 mask_fc &= ~cpu_to_le16(0x0070);
Harvey Harrisonf14df802008-07-02 11:05:35 -0700320 mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
Jiri Bencf0706e822007-05-05 11:45:53 -0700321
Harvey Harrisonf14df802008-07-02 11:05:35 -0700322 hdrlen = ieee80211_hdrlen(hdr->frame_control);
323 len_a = hdrlen - 2;
324 a4_included = ieee80211_has_a4(hdr->frame_control);
325
326 if (ieee80211_is_data_qos(hdr->frame_control))
327 qos_tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
328 else
329 qos_tid = 0;
330
331 data_len = skb->len - hdrlen - CCMP_HDR_LEN;
332 if (encrypted)
333 data_len -= CCMP_MIC_LEN;
334
Jiri Bencf0706e822007-05-05 11:45:53 -0700335 /* First block, b_0 */
Jiri Bencf0706e822007-05-05 11:45:53 -0700336 b_0[0] = 0x59; /* flags: Adata: 1, M: 011, L: 001 */
Jouni Malinenfb733332009-01-08 13:32:00 +0200337 /* Nonce: Nonce Flags | A2 | PN
338 * Nonce Flags: Priority (b0..b3) | Management (b4) | Reserved (b5..b7)
339 */
340 b_0[1] = qos_tid | (mgmt << 4);
Harvey Harrison73e1f7c2008-07-02 11:05:34 -0700341 memcpy(&b_0[2], hdr->addr2, ETH_ALEN);
Jiri Bencf0706e822007-05-05 11:45:53 -0700342 memcpy(&b_0[8], pn, CCMP_PN_LEN);
343 /* l(m) */
Harvey Harrisonf14df802008-07-02 11:05:35 -0700344 put_unaligned_be16(data_len, &b_0[14]);
Jiri Bencf0706e822007-05-05 11:45:53 -0700345
346 /* AAD (extra authenticate-only data) / masked 802.11 header
347 * FC | A1 | A2 | A3 | SC | [A4] | [QC] */
Harvey Harrisonf14df802008-07-02 11:05:35 -0700348 put_unaligned_be16(len_a, &aad[0]);
349 put_unaligned(mask_fc, (__le16 *)&aad[2]);
Harvey Harrison73e1f7c2008-07-02 11:05:34 -0700350 memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN);
Jiri Bencf0706e822007-05-05 11:45:53 -0700351
352 /* Mask Seq#, leave Frag# */
353 aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f;
354 aad[23] = 0;
Harvey Harrisonf14df802008-07-02 11:05:35 -0700355
Jiri Bencf0706e822007-05-05 11:45:53 -0700356 if (a4_included) {
Harvey Harrison73e1f7c2008-07-02 11:05:34 -0700357 memcpy(&aad[24], hdr->addr4, ETH_ALEN);
Harvey Harrisonf14df802008-07-02 11:05:35 -0700358 aad[30] = qos_tid;
Jiri Bencf0706e822007-05-05 11:45:53 -0700359 aad[31] = 0;
Harvey Harrisonf14df802008-07-02 11:05:35 -0700360 } else {
Harvey Harrison73e1f7c2008-07-02 11:05:34 -0700361 memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
Harvey Harrisonf14df802008-07-02 11:05:35 -0700362 aad[24] = qos_tid;
Jiri Bencf0706e822007-05-05 11:45:53 -0700363 }
364}
365
366
367static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn, int key_id)
368{
369 hdr[0] = pn[5];
370 hdr[1] = pn[4];
371 hdr[2] = 0;
372 hdr[3] = 0x20 | (key_id << 6);
373 hdr[4] = pn[3];
374 hdr[5] = pn[2];
375 hdr[6] = pn[1];
376 hdr[7] = pn[0];
377}
378
379
Johannes Bergc6a1fa12008-10-07 12:04:32 +0200380static inline void ccmp_hdr2pn(u8 *pn, u8 *hdr)
Jiri Bencf0706e822007-05-05 11:45:53 -0700381{
382 pn[0] = hdr[7];
383 pn[1] = hdr[6];
384 pn[2] = hdr[5];
385 pn[3] = hdr[4];
386 pn[4] = hdr[1];
387 pn[5] = hdr[0];
Jiri Bencf0706e822007-05-05 11:45:53 -0700388}
389
390
Johannes Berge039fa42008-05-15 12:55:29 +0200391static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
Jiri Bencf0706e822007-05-05 11:45:53 -0700392{
393 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
394 struct ieee80211_key *key = tx->key;
Johannes Berge039fa42008-05-15 12:55:29 +0200395 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Johannes Berg23c07522008-05-29 10:38:53 +0200396 int hdrlen, len, tail;
Johannes Bergaba83a0b2011-07-06 21:59:39 +0200397 u8 *pos;
398 u8 pn[6];
399 u64 pn64;
Johannes Berg0cd20a22011-07-06 22:02:14 +0200400 u8 scratch[6 * AES_BLOCK_SIZE];
Jouni Malinen1f7d77a2009-01-08 13:32:10 +0200401
Johannes Berg813d7662010-01-17 01:47:58 +0100402 if (info->control.hw_key &&
Arik Nemtsov077a9152011-10-23 08:21:41 +0200403 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
404 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) {
Johannes Berg813d7662010-01-17 01:47:58 +0100405 /*
406 * hwaccel has no need for preallocated room for CCMP
407 * header or MIC fields
408 */
Johannes Berg23c07522008-05-29 10:38:53 +0200409 return 0;
Johannes Berge039fa42008-05-15 12:55:29 +0200410 }
411
Harvey Harrisond5184ca2008-06-11 14:21:58 -0700412 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Jiri Bencf0706e822007-05-05 11:45:53 -0700413 len = skb->len - hdrlen;
414
Johannes Berg813d7662010-01-17 01:47:58 +0100415 if (info->control.hw_key)
Johannes Berg23c07522008-05-29 10:38:53 +0200416 tail = 0;
Johannes Berg11a843b2007-08-28 17:01:55 -0400417 else
Johannes Berg23c07522008-05-29 10:38:53 +0200418 tail = CCMP_MIC_LEN;
Jiri Bencf0706e822007-05-05 11:45:53 -0700419
Johannes Berg23c07522008-05-29 10:38:53 +0200420 if (WARN_ON(skb_tailroom(skb) < tail ||
421 skb_headroom(skb) < CCMP_HDR_LEN))
422 return -1;
Jiri Bencf0706e822007-05-05 11:45:53 -0700423
424 pos = skb_push(skb, CCMP_HDR_LEN);
425 memmove(pos, pos + CCMP_HDR_LEN, hdrlen);
Arik Nemtsov077a9152011-10-23 08:21:41 +0200426
427 /* the HW only needs room for the IV, but not the actual IV */
Arik Nemtsove0830f72011-11-10 09:35:13 +0200428 if (info->control.hw_key &&
429 (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
Arik Nemtsov077a9152011-10-23 08:21:41 +0200430 return 0;
431
Jiri Bencf0706e822007-05-05 11:45:53 -0700432 hdr = (struct ieee80211_hdr *) pos;
433 pos += hdrlen;
434
Johannes Bergaba83a0b2011-07-06 21:59:39 +0200435 pn64 = atomic64_inc_return(&key->u.ccmp.tx_pn);
Jiri Bencf0706e822007-05-05 11:45:53 -0700436
Johannes Bergaba83a0b2011-07-06 21:59:39 +0200437 pn[5] = pn64;
438 pn[4] = pn64 >> 8;
439 pn[3] = pn64 >> 16;
440 pn[2] = pn64 >> 24;
441 pn[1] = pn64 >> 32;
442 pn[0] = pn64 >> 40;
Jiri Bencf0706e822007-05-05 11:45:53 -0700443
Johannes Berg8f20fc22007-08-28 17:01:54 -0400444 ccmp_pn2hdr(pos, pn, key->conf.keyidx);
Jiri Bencf0706e822007-05-05 11:45:53 -0700445
Johannes Berg813d7662010-01-17 01:47:58 +0100446 /* hwaccel - with software CCMP header */
447 if (info->control.hw_key)
Jiri Bencf0706e822007-05-05 11:45:53 -0700448 return 0;
Jiri Bencf0706e822007-05-05 11:45:53 -0700449
450 pos += CCMP_HDR_LEN;
Johannes Bergaba83a0b2011-07-06 21:59:39 +0200451 ccmp_special_blocks(skb, pn, scratch, 0);
452 ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, scratch, pos, len,
Jiri Bencf0706e822007-05-05 11:45:53 -0700453 pos, skb_put(skb, CCMP_MIC_LEN));
454
455 return 0;
456}
457
458
Johannes Berg9ae54c82008-01-31 19:48:20 +0100459ieee80211_tx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100460ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx)
Jiri Bencf0706e822007-05-05 11:45:53 -0700461{
Johannes Berg252b86c2011-11-16 15:28:55 +0100462 struct sk_buff *skb;
Jiri Bencf0706e822007-05-05 11:45:53 -0700463
Johannes Berg5cf121c2008-02-25 16:27:43 +0100464 ieee80211_tx_set_protected(tx);
Jiri Bencf0706e822007-05-05 11:45:53 -0700465
Johannes Berg252b86c2011-11-16 15:28:55 +0100466 skb_queue_walk(&tx->skbs, skb) {
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100467 if (ccmp_encrypt_skb(tx, skb) < 0)
468 return TX_DROP;
Johannes Berg252b86c2011-11-16 15:28:55 +0100469 }
Jiri Bencf0706e822007-05-05 11:45:53 -0700470
Johannes Berg9ae54c82008-01-31 19:48:20 +0100471 return TX_CONTINUE;
Jiri Bencf0706e822007-05-05 11:45:53 -0700472}
473
474
Johannes Berg9ae54c82008-01-31 19:48:20 +0100475ieee80211_rx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100476ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx)
Jiri Bencf0706e822007-05-05 11:45:53 -0700477{
Harvey Harrisonc34498b2008-07-02 16:30:52 -0700478 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Jiri Bencf0706e822007-05-05 11:45:53 -0700479 int hdrlen;
480 struct ieee80211_key *key = rx->key;
481 struct sk_buff *skb = rx->skb;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100482 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Jiri Bencf0706e822007-05-05 11:45:53 -0700483 u8 pn[CCMP_PN_LEN];
484 int data_len;
Jouni Malinen91902522010-06-11 10:27:33 -0700485 int queue;
Jiri Bencf0706e822007-05-05 11:45:53 -0700486
Harvey Harrisond5184ca2008-06-11 14:21:58 -0700487 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Jiri Bencf0706e822007-05-05 11:45:53 -0700488
Jouni Malinenfb733332009-01-08 13:32:00 +0200489 if (!ieee80211_is_data(hdr->frame_control) &&
490 !ieee80211_is_robust_mgmt_frame(hdr))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100491 return RX_CONTINUE;
Jiri Bencf0706e822007-05-05 11:45:53 -0700492
493 data_len = skb->len - hdrlen - CCMP_HDR_LEN - CCMP_MIC_LEN;
494 if (!rx->sta || data_len < 0)
Johannes Berge4c26ad2008-01-31 19:48:21 +0100495 return RX_DROP_UNUSABLE;
Jiri Bencf0706e822007-05-05 11:45:53 -0700496
Johannes Berga8286912012-03-12 13:49:14 +0100497 if (status->flag & RX_FLAG_DECRYPTED) {
498 if (!pskb_may_pull(rx->skb, hdrlen + CCMP_HDR_LEN))
499 return RX_DROP_UNUSABLE;
500 } else {
501 if (skb_linearize(rx->skb))
502 return RX_DROP_UNUSABLE;
503 }
504
Johannes Bergc6a1fa12008-10-07 12:04:32 +0200505 ccmp_hdr2pn(pn, skb->data + hdrlen);
Jiri Bencf0706e822007-05-05 11:45:53 -0700506
Johannes Berg9e262972011-07-07 18:45:03 +0200507 queue = rx->security_idx;
Jouni Malinen91902522010-06-11 10:27:33 -0700508
509 if (memcmp(pn, key->u.ccmp.rx_pn[queue], CCMP_PN_LEN) <= 0) {
Jiri Bencf0706e822007-05-05 11:45:53 -0700510 key->u.ccmp.replays++;
Johannes Berge4c26ad2008-01-31 19:48:21 +0100511 return RX_DROP_UNUSABLE;
Jiri Bencf0706e822007-05-05 11:45:53 -0700512 }
513
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100514 if (!(status->flag & RX_FLAG_DECRYPTED)) {
Johannes Berg0cd20a22011-07-06 22:02:14 +0200515 u8 scratch[6 * AES_BLOCK_SIZE];
Johannes Berg7848ba72007-09-14 11:10:25 -0400516 /* hardware didn't decrypt/verify MIC */
Johannes Bergaba83a0b2011-07-06 21:59:39 +0200517 ccmp_special_blocks(skb, pn, scratch, 1);
Jiri Bencf0706e822007-05-05 11:45:53 -0700518
519 if (ieee80211_aes_ccm_decrypt(
Johannes Bergaba83a0b2011-07-06 21:59:39 +0200520 key->u.ccmp.tfm, scratch,
Jiri Bencf0706e822007-05-05 11:45:53 -0700521 skb->data + hdrlen + CCMP_HDR_LEN, data_len,
522 skb->data + skb->len - CCMP_MIC_LEN,
Johannes Bergc6a1fa12008-10-07 12:04:32 +0200523 skb->data + hdrlen + CCMP_HDR_LEN))
Johannes Berge4c26ad2008-01-31 19:48:21 +0100524 return RX_DROP_UNUSABLE;
Jiri Bencf0706e822007-05-05 11:45:53 -0700525 }
526
Jouni Malinen91902522010-06-11 10:27:33 -0700527 memcpy(key->u.ccmp.rx_pn[queue], pn, CCMP_PN_LEN);
Jiri Bencf0706e822007-05-05 11:45:53 -0700528
529 /* Remove CCMP header and MIC */
Johannes Berga8286912012-03-12 13:49:14 +0100530 if (pskb_trim(skb, skb->len - CCMP_MIC_LEN))
531 return RX_DROP_UNUSABLE;
Jiri Bencf0706e822007-05-05 11:45:53 -0700532 memmove(skb->data + CCMP_HDR_LEN, skb->data, hdrlen);
533 skb_pull(skb, CCMP_HDR_LEN);
534
Johannes Berg9ae54c82008-01-31 19:48:20 +0100535 return RX_CONTINUE;
Jiri Bencf0706e822007-05-05 11:45:53 -0700536}
Jouni Malinen765cb462009-01-08 13:32:01 +0200537
538
539static void bip_aad(struct sk_buff *skb, u8 *aad)
540{
541 /* BIP AAD: FC(masked) || A1 || A2 || A3 */
542
543 /* FC type/subtype */
544 aad[0] = skb->data[0];
545 /* Mask FC Retry, PwrMgt, MoreData flags to zero */
546 aad[1] = skb->data[1] & ~(BIT(4) | BIT(5) | BIT(6));
547 /* A1 || A2 || A3 */
548 memcpy(aad + 2, skb->data + 4, 3 * ETH_ALEN);
549}
550
551
Johannes Berg75396ae2011-07-06 22:00:35 +0200552static inline void bip_ipn_set64(u8 *d, u64 pn)
553{
554 *d++ = pn;
555 *d++ = pn >> 8;
556 *d++ = pn >> 16;
557 *d++ = pn >> 24;
558 *d++ = pn >> 32;
559 *d = pn >> 40;
560}
561
Jouni Malinen765cb462009-01-08 13:32:01 +0200562static inline void bip_ipn_swap(u8 *d, const u8 *s)
563{
564 *d++ = s[5];
565 *d++ = s[4];
566 *d++ = s[3];
567 *d++ = s[2];
568 *d++ = s[1];
569 *d = s[0];
570}
571
572
573ieee80211_tx_result
574ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx)
575{
Johannes Berg252b86c2011-11-16 15:28:55 +0100576 struct sk_buff *skb;
577 struct ieee80211_tx_info *info;
Jouni Malinen765cb462009-01-08 13:32:01 +0200578 struct ieee80211_key *key = tx->key;
579 struct ieee80211_mmie *mmie;
Johannes Berg75396ae2011-07-06 22:00:35 +0200580 u8 aad[20];
581 u64 pn64;
Jouni Malinen765cb462009-01-08 13:32:01 +0200582
Johannes Berg252b86c2011-11-16 15:28:55 +0100583 if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
584 return TX_DROP;
585
586 skb = skb_peek(&tx->skbs);
587
588 info = IEEE80211_SKB_CB(skb);
589
Johannes Berg813d7662010-01-17 01:47:58 +0100590 if (info->control.hw_key)
Johannes Berg252b86c2011-11-16 15:28:55 +0100591 return TX_CONTINUE;
Jouni Malinen765cb462009-01-08 13:32:01 +0200592
593 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
594 return TX_DROP;
595
596 mmie = (struct ieee80211_mmie *) skb_put(skb, sizeof(*mmie));
597 mmie->element_id = WLAN_EID_MMIE;
598 mmie->length = sizeof(*mmie) - 2;
599 mmie->key_id = cpu_to_le16(key->conf.keyidx);
600
601 /* PN = PN + 1 */
Johannes Berg75396ae2011-07-06 22:00:35 +0200602 pn64 = atomic64_inc_return(&key->u.aes_cmac.tx_pn);
Jouni Malinen765cb462009-01-08 13:32:01 +0200603
Johannes Berg75396ae2011-07-06 22:00:35 +0200604 bip_ipn_set64(mmie->sequence_number, pn64);
Jouni Malinen765cb462009-01-08 13:32:01 +0200605
606 bip_aad(skb, aad);
607
608 /*
609 * MIC = AES-128-CMAC(IGTK, AAD || Management Frame Body || MMIE, 64)
610 */
Johannes Berg75396ae2011-07-06 22:00:35 +0200611 ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad,
612 skb->data + 24, skb->len - 24, mmie->mic);
Jouni Malinen765cb462009-01-08 13:32:01 +0200613
614 return TX_CONTINUE;
615}
616
617
618ieee80211_rx_result
619ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx)
620{
621 struct sk_buff *skb = rx->skb;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100622 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Jouni Malinen765cb462009-01-08 13:32:01 +0200623 struct ieee80211_key *key = rx->key;
624 struct ieee80211_mmie *mmie;
625 u8 aad[20], mic[8], ipn[6];
626 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
627
628 if (!ieee80211_is_mgmt(hdr->frame_control))
629 return RX_CONTINUE;
630
Johannes Berga8286912012-03-12 13:49:14 +0100631 /* management frames are already linear */
632
Jouni Malinen765cb462009-01-08 13:32:01 +0200633 if (skb->len < 24 + sizeof(*mmie))
634 return RX_DROP_UNUSABLE;
635
636 mmie = (struct ieee80211_mmie *)
637 (skb->data + skb->len - sizeof(*mmie));
638 if (mmie->element_id != WLAN_EID_MMIE ||
639 mmie->length != sizeof(*mmie) - 2)
640 return RX_DROP_UNUSABLE; /* Invalid MMIE */
641
642 bip_ipn_swap(ipn, mmie->sequence_number);
643
644 if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) {
645 key->u.aes_cmac.replays++;
646 return RX_DROP_UNUSABLE;
647 }
648
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100649 if (!(status->flag & RX_FLAG_DECRYPTED)) {
Jouni Malinen765cb462009-01-08 13:32:01 +0200650 /* hardware didn't decrypt/verify MIC */
651 bip_aad(skb, aad);
Johannes Berg75396ae2011-07-06 22:00:35 +0200652 ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad,
Jouni Malinen765cb462009-01-08 13:32:01 +0200653 skb->data + 24, skb->len - 24, mic);
654 if (memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) {
655 key->u.aes_cmac.icverrors++;
656 return RX_DROP_UNUSABLE;
657 }
658 }
659
660 memcpy(key->u.aes_cmac.rx_pn, ipn, 6);
661
662 /* Remove MMIE */
663 skb_trim(skb, skb->len - sizeof(*mmie));
664
665 return RX_CONTINUE;
666}
Yoni Divinskyd32a1022012-01-16 15:18:59 +0200667
668ieee80211_tx_result
669ieee80211_crypto_hw_encrypt(struct ieee80211_tx_data *tx)
670{
671 struct sk_buff *skb;
672 struct ieee80211_tx_info *info = NULL;
673
674 skb_queue_walk(&tx->skbs, skb) {
675 info = IEEE80211_SKB_CB(skb);
676
677 /* handle hw-only algorithm */
678 if (!info->control.hw_key)
679 return TX_DROP;
680 }
681
682 ieee80211_tx_set_protected(tx);
683
684 return TX_CONTINUE;
685}