blob: 8d59d27d887e3a0b96d9d995e3138595f0a13c79 [file] [log] [blame]
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 Bergeb063c12007-08-28 17:01:53 -040018
Jiri Bencf0706e822007-05-05 11:45:53 -070019#include "ieee80211_i.h"
20#include "michael.h"
21#include "tkip.h"
22#include "aes_ccm.h"
Jouni Malinen765cb462009-01-08 13:32:01 +020023#include "aes_cmac.h"
Jiri Bencf0706e822007-05-05 11:45:53 -070024#include "wpa.h"
25
Johannes Berg9ae54c82008-01-31 19:48:20 +010026ieee80211_tx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +010027ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx)
Jiri Bencf0706e822007-05-05 11:45:53 -070028{
Harvey Harrison8e8862b2008-07-02 11:05:35 -070029 u8 *data, *key, *mic, key_offset;
Jiri Bencf0706e822007-05-05 11:45:53 -070030 size_t data_len;
Harvey Harrison8e8862b2008-07-02 11:05:35 -070031 unsigned int hdrlen;
32 struct ieee80211_hdr *hdr;
Jiri Bencf0706e822007-05-05 11:45:53 -070033 struct sk_buff *skb = tx->skb;
Johannes Berg813d7662010-01-17 01:47:58 +010034 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Jiri Bencf0706e822007-05-05 11:45:53 -070035 int authenticator;
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 Berg8f20fc22007-08-28 17:01:54 -040039 if (!tx->key || tx->key->conf.alg != ALG_TKIP || skb->len < 24 ||
Harvey Harrisonc34498b2008-07-02 16:30:52 -070040 !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
Johannes Berg813d7662010-01-17 01:47:58 +010050 if (info->control.hw_key &&
Johannes Berg5cf121c2008-02-25 16:27:43 +010051 !(tx->flags & IEEE80211_TX_FRAGMENTED) &&
Johannes Berg813d7662010-01-17 01:47:58 +010052 !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC)) {
53 /* hwaccel - with no need for SW-generated MMIC */
Johannes Berg9ae54c82008-01-31 19:48:20 +010054 return TX_CONTINUE;
Jiri Bencf0706e822007-05-05 11:45:53 -070055 }
56
Johannes Berg23c07522008-05-29 10:38:53 +020057 tail = MICHAEL_MIC_LEN;
Johannes Berg813d7662010-01-17 01:47:58 +010058 if (!info->control.hw_key)
Johannes Berg23c07522008-05-29 10:38:53 +020059 tail += TKIP_ICV_LEN;
60
61 if (WARN_ON(skb_tailroom(skb) < tail ||
62 skb_headroom(skb) < TKIP_IV_LEN))
63 return TX_DROP;
Jiri Bencf0706e822007-05-05 11:45:53 -070064
65#if 0
66 authenticator = fc & IEEE80211_FCTL_FROMDS; /* FIX */
67#else
68 authenticator = 1;
69#endif
Luis R. Rodriguezffd78912008-06-21 10:02:46 -040070 key_offset = authenticator ?
71 NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY :
72 NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY;
73 key = &tx->key->conf.key[key_offset];
Jiri Bencf0706e822007-05-05 11:45:53 -070074 mic = skb_put(skb, MICHAEL_MIC_LEN);
Harvey Harrison8e8862b2008-07-02 11:05:35 -070075 michael_mic(key, hdr, data, data_len, mic);
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{
Harvey Harrison8e8862b2008-07-02 11:05:35 -070084 u8 *data, *key = NULL, key_offset;
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 int authenticator = 1, wpa_test = 0;
92
Johannes Bergc6a1fa12008-10-07 12:04:32 +020093 /* No way to verify the MIC if the hardware stripped it */
Johannes Bergeb9fb5b2009-11-16 13:58:20 +010094 if (status->flag & RX_FLAG_MMIC_STRIPPED)
Johannes Berg9ae54c82008-01-31 19:48:20 +010095 return RX_CONTINUE;
Jiri Bencf0706e822007-05-05 11:45:53 -070096
Johannes Berg8f20fc22007-08-28 17:01:54 -040097 if (!rx->key || rx->key->conf.alg != ALG_TKIP ||
Harvey Harrisonc34498b2008-07-02 16:30:52 -070098 !ieee80211_has_protected(hdr->frame_control) ||
99 !ieee80211_is_data_present(hdr->frame_control))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100100 return RX_CONTINUE;
Jiri Bencf0706e822007-05-05 11:45:53 -0700101
Harvey Harrison8e8862b2008-07-02 11:05:35 -0700102 hdrlen = ieee80211_hdrlen(hdr->frame_control);
103 if (skb->len < hdrlen + MICHAEL_MIC_LEN)
Johannes Berge4c26ad2008-01-31 19:48:21 +0100104 return RX_DROP_UNUSABLE;
Jiri Bencf0706e822007-05-05 11:45:53 -0700105
Harvey Harrison8e8862b2008-07-02 11:05:35 -0700106 data = skb->data + hdrlen;
107 data_len = skb->len - hdrlen - MICHAEL_MIC_LEN;
Jiri Bencf0706e822007-05-05 11:45:53 -0700108
109#if 0
110 authenticator = fc & IEEE80211_FCTL_TODS; /* FIX */
111#else
112 authenticator = 1;
113#endif
Luis R. Rodriguezffd78912008-06-21 10:02:46 -0400114 key_offset = authenticator ?
115 NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY :
116 NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY;
117 key = &rx->key->conf.key[key_offset];
Harvey Harrison8e8862b2008-07-02 11:05:35 -0700118 michael_mic(key, hdr, data, data_len, mic);
Jiri Bencf0706e822007-05-05 11:45:53 -0700119 if (memcmp(mic, data + data_len, MICHAEL_MIC_LEN) != 0 || wpa_test) {
Johannes Berg5cf121c2008-02-25 16:27:43 +0100120 if (!(rx->flags & IEEE80211_RX_RA_MATCH))
Johannes Berge4c26ad2008-01-31 19:48:21 +0100121 return RX_DROP_UNUSABLE;
Jiri Bencf0706e822007-05-05 11:45:53 -0700122
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200123 mac80211_ev_michael_mic_failure(rx->sdata, rx->key->conf.keyidx,
Johannes Berge6d6e342009-07-01 21:26:47 +0200124 (void *) skb->data, NULL,
125 GFP_ATOMIC);
Johannes Berge4c26ad2008-01-31 19:48:21 +0100126 return RX_DROP_UNUSABLE;
Jiri Bencf0706e822007-05-05 11:45:53 -0700127 }
128
Jiri Bencf0706e822007-05-05 11:45:53 -0700129 /* remove Michael MIC from payload */
130 skb_trim(skb, skb->len - MICHAEL_MIC_LEN);
131
Johannes Berg50741ae2007-09-26 15:19:45 +0200132 /* update IV in key information to be able to detect replays */
Harvey Harrisonb0f76b32008-05-14 16:26:19 -0700133 rx->key->u.tkip.rx[rx->queue].iv32 = rx->tkip_iv32;
134 rx->key->u.tkip.rx[rx->queue].iv16 = rx->tkip_iv16;
Johannes Berg50741ae2007-09-26 15:19:45 +0200135
Johannes Berg9ae54c82008-01-31 19:48:20 +0100136 return RX_CONTINUE;
Jiri Bencf0706e822007-05-05 11:45:53 -0700137}
138
139
Johannes Berge039fa42008-05-15 12:55:29 +0200140static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
Jiri Bencf0706e822007-05-05 11:45:53 -0700141{
142 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
143 struct ieee80211_key *key = tx->key;
Johannes Berge039fa42008-05-15 12:55:29 +0200144 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Harvey Harrisond5184ca2008-06-11 14:21:58 -0700145 unsigned int hdrlen;
146 int len, tail;
Jiri Bencf0706e822007-05-05 11:45:53 -0700147 u8 *pos;
148
Johannes Berg813d7662010-01-17 01:47:58 +0100149 if (info->control.hw_key &&
150 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV)) {
151 /* hwaccel - with no need for software-generated IV */
Johannes Berg23c07522008-05-29 10:38:53 +0200152 return 0;
Johannes Berge039fa42008-05-15 12:55:29 +0200153 }
154
Harvey Harrisond5184ca2008-06-11 14:21:58 -0700155 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Jiri Bencf0706e822007-05-05 11:45:53 -0700156 len = skb->len - hdrlen;
157
Johannes Berg813d7662010-01-17 01:47:58 +0100158 if (info->control.hw_key)
Johannes Berg23c07522008-05-29 10:38:53 +0200159 tail = 0;
Johannes Berg11a843b2007-08-28 17:01:55 -0400160 else
Johannes Berg23c07522008-05-29 10:38:53 +0200161 tail = TKIP_ICV_LEN;
Johannes Berg8f20fc22007-08-28 17:01:54 -0400162
Johannes Berg23c07522008-05-29 10:38:53 +0200163 if (WARN_ON(skb_tailroom(skb) < tail ||
164 skb_headroom(skb) < TKIP_IV_LEN))
165 return -1;
Jiri Bencf0706e822007-05-05 11:45:53 -0700166
167 pos = skb_push(skb, TKIP_IV_LEN);
168 memmove(pos, pos + TKIP_IV_LEN, hdrlen);
169 pos += hdrlen;
170
171 /* Increase IV for the frame */
Harvey Harrisonb0f76b32008-05-14 16:26:19 -0700172 key->u.tkip.tx.iv16++;
173 if (key->u.tkip.tx.iv16 == 0)
174 key->u.tkip.tx.iv32++;
Jiri Bencf0706e822007-05-05 11:45:53 -0700175
Johannes Berg813d7662010-01-17 01:47:58 +0100176 pos = ieee80211_tkip_add_iv(pos, key, key->u.tkip.tx.iv16);
Jiri Bencf0706e822007-05-05 11:45:53 -0700177
Johannes Berg813d7662010-01-17 01:47:58 +0100178 /* hwaccel - with software IV */
179 if (info->control.hw_key)
Jiri Bencf0706e822007-05-05 11:45:53 -0700180 return 0;
Jiri Bencf0706e822007-05-05 11:45:53 -0700181
182 /* Add room for ICV */
183 skb_put(skb, TKIP_ICV_LEN);
184
185 hdr = (struct ieee80211_hdr *) skb->data;
John W. Linville34731872010-07-07 15:07:49 -0400186 return ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm,
187 key, pos, len, hdr->addr2);
Jiri Bencf0706e822007-05-05 11:45:53 -0700188}
189
190
Johannes Berg9ae54c82008-01-31 19:48:20 +0100191ieee80211_tx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100192ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx)
Jiri Bencf0706e822007-05-05 11:45:53 -0700193{
Jiri Bencf0706e822007-05-05 11:45:53 -0700194 struct sk_buff *skb = tx->skb;
Jiri Bencf0706e822007-05-05 11:45:53 -0700195
Johannes Berg5cf121c2008-02-25 16:27:43 +0100196 ieee80211_tx_set_protected(tx);
Jiri Bencf0706e822007-05-05 11:45:53 -0700197
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100198 do {
199 if (tkip_encrypt_skb(tx, skb) < 0)
200 return TX_DROP;
201 } while ((skb = skb->next));
Jiri Bencf0706e822007-05-05 11:45:53 -0700202
Johannes Berg9ae54c82008-01-31 19:48:20 +0100203 return TX_CONTINUE;
Jiri Bencf0706e822007-05-05 11:45:53 -0700204}
205
206
Johannes Berg9ae54c82008-01-31 19:48:20 +0100207ieee80211_rx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100208ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx)
Jiri Bencf0706e822007-05-05 11:45:53 -0700209{
210 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
Jiri Bencf0706e822007-05-05 11:45:53 -0700211 int hdrlen, res, hwaccel = 0, wpa_test = 0;
212 struct ieee80211_key *key = rx->key;
213 struct sk_buff *skb = rx->skb;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100214 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Jiri Bencf0706e822007-05-05 11:45:53 -0700215
Harvey Harrisond5184ca2008-06-11 14:21:58 -0700216 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Jiri Bencf0706e822007-05-05 11:45:53 -0700217
Harvey Harrisonc34498b2008-07-02 16:30:52 -0700218 if (!ieee80211_is_data(hdr->frame_control))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100219 return RX_CONTINUE;
Jiri Bencf0706e822007-05-05 11:45:53 -0700220
221 if (!rx->sta || skb->len - hdrlen < 12)
Johannes Berge4c26ad2008-01-31 19:48:21 +0100222 return RX_DROP_UNUSABLE;
Jiri Bencf0706e822007-05-05 11:45:53 -0700223
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100224 if (status->flag & RX_FLAG_DECRYPTED) {
225 if (status->flag & RX_FLAG_IV_STRIPPED) {
Johannes Berg7848ba72007-09-14 11:10:25 -0400226 /*
227 * Hardware took care of all processing, including
228 * replay protection, and stripped the ICV/IV so
229 * we cannot do any checks here.
230 */
Johannes Berg9ae54c82008-01-31 19:48:20 +0100231 return RX_CONTINUE;
Jiri Bencf0706e822007-05-05 11:45:53 -0700232 }
233
234 /* let TKIP code verify IV, but skip decryption */
235 hwaccel = 1;
236 }
237
238 res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm,
239 key, skb->data + hdrlen,
Johannes Berg17741cd2008-09-11 00:02:02 +0200240 skb->len - hdrlen, rx->sta->sta.addr,
Emmanuel Grumbach9ae4fda2008-03-20 15:06:42 +0200241 hdr->addr1, hwaccel, rx->queue,
Johannes Berg5cf121c2008-02-25 16:27:43 +0100242 &rx->tkip_iv32,
243 &rx->tkip_iv16);
Johannes Bergf4ea83d2008-06-30 15:10:46 +0200244 if (res != TKIP_DECRYPT_OK || wpa_test)
Johannes Berge4c26ad2008-01-31 19:48:21 +0100245 return RX_DROP_UNUSABLE;
Jiri Bencf0706e822007-05-05 11:45:53 -0700246
247 /* Trim ICV */
248 skb_trim(skb, skb->len - TKIP_ICV_LEN);
249
250 /* Remove IV */
251 memmove(skb->data + TKIP_IV_LEN, skb->data, hdrlen);
252 skb_pull(skb, TKIP_IV_LEN);
253
Johannes Berg9ae54c82008-01-31 19:48:20 +0100254 return RX_CONTINUE;
Jiri Bencf0706e822007-05-05 11:45:53 -0700255}
256
257
Harvey Harrisonfeccb462008-07-02 16:30:52 -0700258static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *scratch,
Jiri Bencf0706e822007-05-05 11:45:53 -0700259 int encrypted)
260{
Harvey Harrisonf14df802008-07-02 11:05:35 -0700261 __le16 mask_fc;
Jouni Malinenfb733332009-01-08 13:32:00 +0200262 int a4_included, mgmt;
Harvey Harrisonf14df802008-07-02 11:05:35 -0700263 u8 qos_tid;
Harvey Harrisonfeccb462008-07-02 16:30:52 -0700264 u8 *b_0, *aad;
Harvey Harrisonf14df802008-07-02 11:05:35 -0700265 u16 data_len, len_a;
266 unsigned int hdrlen;
267 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
Jiri Bencf0706e822007-05-05 11:45:53 -0700268
Harvey Harrisonfeccb462008-07-02 16:30:52 -0700269 b_0 = scratch + 3 * AES_BLOCK_LEN;
270 aad = scratch + 4 * AES_BLOCK_LEN;
271
Harvey Harrisonf14df802008-07-02 11:05:35 -0700272 /*
Jouni Malinenfb733332009-01-08 13:32:00 +0200273 * Mask FC: zero subtype b4 b5 b6 (if not mgmt)
Harvey Harrisonf14df802008-07-02 11:05:35 -0700274 * Retry, PwrMgt, MoreData; set Protected
275 */
Jouni Malinenfb733332009-01-08 13:32:00 +0200276 mgmt = ieee80211_is_mgmt(hdr->frame_control);
Harvey Harrisonf14df802008-07-02 11:05:35 -0700277 mask_fc = hdr->frame_control;
Jouni Malinenfb733332009-01-08 13:32:00 +0200278 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY |
Harvey Harrisonf14df802008-07-02 11:05:35 -0700279 IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA);
Jouni Malinenfb733332009-01-08 13:32:00 +0200280 if (!mgmt)
281 mask_fc &= ~cpu_to_le16(0x0070);
Harvey Harrisonf14df802008-07-02 11:05:35 -0700282 mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
Jiri Bencf0706e822007-05-05 11:45:53 -0700283
Harvey Harrisonf14df802008-07-02 11:05:35 -0700284 hdrlen = ieee80211_hdrlen(hdr->frame_control);
285 len_a = hdrlen - 2;
286 a4_included = ieee80211_has_a4(hdr->frame_control);
287
288 if (ieee80211_is_data_qos(hdr->frame_control))
289 qos_tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
290 else
291 qos_tid = 0;
292
293 data_len = skb->len - hdrlen - CCMP_HDR_LEN;
294 if (encrypted)
295 data_len -= CCMP_MIC_LEN;
296
Jiri Bencf0706e822007-05-05 11:45:53 -0700297 /* First block, b_0 */
Jiri Bencf0706e822007-05-05 11:45:53 -0700298 b_0[0] = 0x59; /* flags: Adata: 1, M: 011, L: 001 */
Jouni Malinenfb733332009-01-08 13:32:00 +0200299 /* Nonce: Nonce Flags | A2 | PN
300 * Nonce Flags: Priority (b0..b3) | Management (b4) | Reserved (b5..b7)
301 */
302 b_0[1] = qos_tid | (mgmt << 4);
Harvey Harrison73e1f7c2008-07-02 11:05:34 -0700303 memcpy(&b_0[2], hdr->addr2, ETH_ALEN);
Jiri Bencf0706e822007-05-05 11:45:53 -0700304 memcpy(&b_0[8], pn, CCMP_PN_LEN);
305 /* l(m) */
Harvey Harrisonf14df802008-07-02 11:05:35 -0700306 put_unaligned_be16(data_len, &b_0[14]);
Jiri Bencf0706e822007-05-05 11:45:53 -0700307
308 /* AAD (extra authenticate-only data) / masked 802.11 header
309 * FC | A1 | A2 | A3 | SC | [A4] | [QC] */
Harvey Harrisonf14df802008-07-02 11:05:35 -0700310 put_unaligned_be16(len_a, &aad[0]);
311 put_unaligned(mask_fc, (__le16 *)&aad[2]);
Harvey Harrison73e1f7c2008-07-02 11:05:34 -0700312 memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN);
Jiri Bencf0706e822007-05-05 11:45:53 -0700313
314 /* Mask Seq#, leave Frag# */
315 aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f;
316 aad[23] = 0;
Harvey Harrisonf14df802008-07-02 11:05:35 -0700317
Jiri Bencf0706e822007-05-05 11:45:53 -0700318 if (a4_included) {
Harvey Harrison73e1f7c2008-07-02 11:05:34 -0700319 memcpy(&aad[24], hdr->addr4, ETH_ALEN);
Harvey Harrisonf14df802008-07-02 11:05:35 -0700320 aad[30] = qos_tid;
Jiri Bencf0706e822007-05-05 11:45:53 -0700321 aad[31] = 0;
Harvey Harrisonf14df802008-07-02 11:05:35 -0700322 } else {
Harvey Harrison73e1f7c2008-07-02 11:05:34 -0700323 memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
Harvey Harrisonf14df802008-07-02 11:05:35 -0700324 aad[24] = qos_tid;
Jiri Bencf0706e822007-05-05 11:45:53 -0700325 }
326}
327
328
329static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn, int key_id)
330{
331 hdr[0] = pn[5];
332 hdr[1] = pn[4];
333 hdr[2] = 0;
334 hdr[3] = 0x20 | (key_id << 6);
335 hdr[4] = pn[3];
336 hdr[5] = pn[2];
337 hdr[6] = pn[1];
338 hdr[7] = pn[0];
339}
340
341
Johannes Bergc6a1fa12008-10-07 12:04:32 +0200342static inline void ccmp_hdr2pn(u8 *pn, u8 *hdr)
Jiri Bencf0706e822007-05-05 11:45:53 -0700343{
344 pn[0] = hdr[7];
345 pn[1] = hdr[6];
346 pn[2] = hdr[5];
347 pn[3] = hdr[4];
348 pn[4] = hdr[1];
349 pn[5] = hdr[0];
Jiri Bencf0706e822007-05-05 11:45:53 -0700350}
351
352
Johannes Berge039fa42008-05-15 12:55:29 +0200353static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
Jiri Bencf0706e822007-05-05 11:45:53 -0700354{
355 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
356 struct ieee80211_key *key = tx->key;
Johannes Berge039fa42008-05-15 12:55:29 +0200357 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Johannes Berg23c07522008-05-29 10:38:53 +0200358 int hdrlen, len, tail;
Harvey Harrisonfeccb462008-07-02 16:30:52 -0700359 u8 *pos, *pn;
Jiri Bencf0706e822007-05-05 11:45:53 -0700360 int i;
Jouni Malinen1f7d77a2009-01-08 13:32:10 +0200361
Johannes Berg813d7662010-01-17 01:47:58 +0100362 if (info->control.hw_key &&
363 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV)) {
364 /*
365 * hwaccel has no need for preallocated room for CCMP
366 * header or MIC fields
367 */
Johannes Berg23c07522008-05-29 10:38:53 +0200368 return 0;
Johannes Berge039fa42008-05-15 12:55:29 +0200369 }
370
Harvey Harrisond5184ca2008-06-11 14:21:58 -0700371 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Jiri Bencf0706e822007-05-05 11:45:53 -0700372 len = skb->len - hdrlen;
373
Johannes Berg813d7662010-01-17 01:47:58 +0100374 if (info->control.hw_key)
Johannes Berg23c07522008-05-29 10:38:53 +0200375 tail = 0;
Johannes Berg11a843b2007-08-28 17:01:55 -0400376 else
Johannes Berg23c07522008-05-29 10:38:53 +0200377 tail = CCMP_MIC_LEN;
Jiri Bencf0706e822007-05-05 11:45:53 -0700378
Johannes Berg23c07522008-05-29 10:38:53 +0200379 if (WARN_ON(skb_tailroom(skb) < tail ||
380 skb_headroom(skb) < CCMP_HDR_LEN))
381 return -1;
Jiri Bencf0706e822007-05-05 11:45:53 -0700382
383 pos = skb_push(skb, CCMP_HDR_LEN);
384 memmove(pos, pos + CCMP_HDR_LEN, hdrlen);
385 hdr = (struct ieee80211_hdr *) pos;
386 pos += hdrlen;
387
388 /* PN = PN + 1 */
389 pn = key->u.ccmp.tx_pn;
390
391 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
392 pn[i]++;
393 if (pn[i])
394 break;
395 }
396
Johannes Berg8f20fc22007-08-28 17:01:54 -0400397 ccmp_pn2hdr(pos, pn, key->conf.keyidx);
Jiri Bencf0706e822007-05-05 11:45:53 -0700398
Johannes Berg813d7662010-01-17 01:47:58 +0100399 /* hwaccel - with software CCMP header */
400 if (info->control.hw_key)
Jiri Bencf0706e822007-05-05 11:45:53 -0700401 return 0;
Jiri Bencf0706e822007-05-05 11:45:53 -0700402
403 pos += CCMP_HDR_LEN;
Harvey Harrisonfeccb462008-07-02 16:30:52 -0700404 ccmp_special_blocks(skb, pn, key->u.ccmp.tx_crypto_buf, 0);
405 ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, key->u.ccmp.tx_crypto_buf, pos, len,
Jiri Bencf0706e822007-05-05 11:45:53 -0700406 pos, skb_put(skb, CCMP_MIC_LEN));
407
408 return 0;
409}
410
411
Johannes Berg9ae54c82008-01-31 19:48:20 +0100412ieee80211_tx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100413ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx)
Jiri Bencf0706e822007-05-05 11:45:53 -0700414{
Jiri Bencf0706e822007-05-05 11:45:53 -0700415 struct sk_buff *skb = tx->skb;
Jiri Bencf0706e822007-05-05 11:45:53 -0700416
Johannes Berg5cf121c2008-02-25 16:27:43 +0100417 ieee80211_tx_set_protected(tx);
Jiri Bencf0706e822007-05-05 11:45:53 -0700418
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100419 do {
420 if (ccmp_encrypt_skb(tx, skb) < 0)
421 return TX_DROP;
422 } while ((skb = skb->next));
Jiri Bencf0706e822007-05-05 11:45:53 -0700423
Johannes Berg9ae54c82008-01-31 19:48:20 +0100424 return TX_CONTINUE;
Jiri Bencf0706e822007-05-05 11:45:53 -0700425}
426
427
Johannes Berg9ae54c82008-01-31 19:48:20 +0100428ieee80211_rx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100429ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx)
Jiri Bencf0706e822007-05-05 11:45:53 -0700430{
Harvey Harrisonc34498b2008-07-02 16:30:52 -0700431 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Jiri Bencf0706e822007-05-05 11:45:53 -0700432 int hdrlen;
433 struct ieee80211_key *key = rx->key;
434 struct sk_buff *skb = rx->skb;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100435 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Jiri Bencf0706e822007-05-05 11:45:53 -0700436 u8 pn[CCMP_PN_LEN];
437 int data_len;
Jouni Malinen91902522010-06-11 10:27:33 -0700438 int queue;
Jiri Bencf0706e822007-05-05 11:45:53 -0700439
Harvey Harrisond5184ca2008-06-11 14:21:58 -0700440 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Jiri Bencf0706e822007-05-05 11:45:53 -0700441
Jouni Malinenfb733332009-01-08 13:32:00 +0200442 if (!ieee80211_is_data(hdr->frame_control) &&
443 !ieee80211_is_robust_mgmt_frame(hdr))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100444 return RX_CONTINUE;
Jiri Bencf0706e822007-05-05 11:45:53 -0700445
446 data_len = skb->len - hdrlen - CCMP_HDR_LEN - CCMP_MIC_LEN;
447 if (!rx->sta || data_len < 0)
Johannes Berge4c26ad2008-01-31 19:48:21 +0100448 return RX_DROP_UNUSABLE;
Jiri Bencf0706e822007-05-05 11:45:53 -0700449
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100450 if ((status->flag & RX_FLAG_DECRYPTED) &&
451 (status->flag & RX_FLAG_IV_STRIPPED))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100452 return RX_CONTINUE;
Jiri Bencf0706e822007-05-05 11:45:53 -0700453
Johannes Bergc6a1fa12008-10-07 12:04:32 +0200454 ccmp_hdr2pn(pn, skb->data + hdrlen);
Jiri Bencf0706e822007-05-05 11:45:53 -0700455
Jouni Malinen91902522010-06-11 10:27:33 -0700456 queue = ieee80211_is_mgmt(hdr->frame_control) ?
457 NUM_RX_DATA_QUEUES : rx->queue;
458
459 if (memcmp(pn, key->u.ccmp.rx_pn[queue], CCMP_PN_LEN) <= 0) {
Jiri Bencf0706e822007-05-05 11:45:53 -0700460 key->u.ccmp.replays++;
Johannes Berge4c26ad2008-01-31 19:48:21 +0100461 return RX_DROP_UNUSABLE;
Jiri Bencf0706e822007-05-05 11:45:53 -0700462 }
463
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100464 if (!(status->flag & RX_FLAG_DECRYPTED)) {
Johannes Berg7848ba72007-09-14 11:10:25 -0400465 /* hardware didn't decrypt/verify MIC */
Harvey Harrisonfeccb462008-07-02 16:30:52 -0700466 ccmp_special_blocks(skb, pn, key->u.ccmp.rx_crypto_buf, 1);
Jiri Bencf0706e822007-05-05 11:45:53 -0700467
468 if (ieee80211_aes_ccm_decrypt(
Harvey Harrisonfeccb462008-07-02 16:30:52 -0700469 key->u.ccmp.tfm, key->u.ccmp.rx_crypto_buf,
Jiri Bencf0706e822007-05-05 11:45:53 -0700470 skb->data + hdrlen + CCMP_HDR_LEN, data_len,
471 skb->data + skb->len - CCMP_MIC_LEN,
Johannes Bergc6a1fa12008-10-07 12:04:32 +0200472 skb->data + hdrlen + CCMP_HDR_LEN))
Johannes Berge4c26ad2008-01-31 19:48:21 +0100473 return RX_DROP_UNUSABLE;
Jiri Bencf0706e822007-05-05 11:45:53 -0700474 }
475
Jouni Malinen91902522010-06-11 10:27:33 -0700476 memcpy(key->u.ccmp.rx_pn[queue], pn, CCMP_PN_LEN);
Jiri Bencf0706e822007-05-05 11:45:53 -0700477
478 /* Remove CCMP header and MIC */
479 skb_trim(skb, skb->len - CCMP_MIC_LEN);
480 memmove(skb->data + CCMP_HDR_LEN, skb->data, hdrlen);
481 skb_pull(skb, CCMP_HDR_LEN);
482
Johannes Berg9ae54c82008-01-31 19:48:20 +0100483 return RX_CONTINUE;
Jiri Bencf0706e822007-05-05 11:45:53 -0700484}
Jouni Malinen765cb462009-01-08 13:32:01 +0200485
486
487static void bip_aad(struct sk_buff *skb, u8 *aad)
488{
489 /* BIP AAD: FC(masked) || A1 || A2 || A3 */
490
491 /* FC type/subtype */
492 aad[0] = skb->data[0];
493 /* Mask FC Retry, PwrMgt, MoreData flags to zero */
494 aad[1] = skb->data[1] & ~(BIT(4) | BIT(5) | BIT(6));
495 /* A1 || A2 || A3 */
496 memcpy(aad + 2, skb->data + 4, 3 * ETH_ALEN);
497}
498
499
500static inline void bip_ipn_swap(u8 *d, const u8 *s)
501{
502 *d++ = s[5];
503 *d++ = s[4];
504 *d++ = s[3];
505 *d++ = s[2];
506 *d++ = s[1];
507 *d = s[0];
508}
509
510
511ieee80211_tx_result
512ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx)
513{
514 struct sk_buff *skb = tx->skb;
515 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
516 struct ieee80211_key *key = tx->key;
517 struct ieee80211_mmie *mmie;
518 u8 *pn, aad[20];
519 int i;
520
Johannes Berg813d7662010-01-17 01:47:58 +0100521 if (info->control.hw_key)
Jouni Malinen765cb462009-01-08 13:32:01 +0200522 return 0;
Jouni Malinen765cb462009-01-08 13:32:01 +0200523
524 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
525 return TX_DROP;
526
527 mmie = (struct ieee80211_mmie *) skb_put(skb, sizeof(*mmie));
528 mmie->element_id = WLAN_EID_MMIE;
529 mmie->length = sizeof(*mmie) - 2;
530 mmie->key_id = cpu_to_le16(key->conf.keyidx);
531
532 /* PN = PN + 1 */
533 pn = key->u.aes_cmac.tx_pn;
534
535 for (i = sizeof(key->u.aes_cmac.tx_pn) - 1; i >= 0; i--) {
536 pn[i]++;
537 if (pn[i])
538 break;
539 }
540 bip_ipn_swap(mmie->sequence_number, pn);
541
542 bip_aad(skb, aad);
543
544 /*
545 * MIC = AES-128-CMAC(IGTK, AAD || Management Frame Body || MMIE, 64)
546 */
547 ieee80211_aes_cmac(key->u.aes_cmac.tfm, key->u.aes_cmac.tx_crypto_buf,
548 aad, skb->data + 24, skb->len - 24, mmie->mic);
549
550 return TX_CONTINUE;
551}
552
553
554ieee80211_rx_result
555ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx)
556{
557 struct sk_buff *skb = rx->skb;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100558 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Jouni Malinen765cb462009-01-08 13:32:01 +0200559 struct ieee80211_key *key = rx->key;
560 struct ieee80211_mmie *mmie;
561 u8 aad[20], mic[8], ipn[6];
562 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
563
564 if (!ieee80211_is_mgmt(hdr->frame_control))
565 return RX_CONTINUE;
566
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100567 if ((status->flag & RX_FLAG_DECRYPTED) &&
568 (status->flag & RX_FLAG_IV_STRIPPED))
Jouni Malinen765cb462009-01-08 13:32:01 +0200569 return RX_CONTINUE;
570
571 if (skb->len < 24 + sizeof(*mmie))
572 return RX_DROP_UNUSABLE;
573
574 mmie = (struct ieee80211_mmie *)
575 (skb->data + skb->len - sizeof(*mmie));
576 if (mmie->element_id != WLAN_EID_MMIE ||
577 mmie->length != sizeof(*mmie) - 2)
578 return RX_DROP_UNUSABLE; /* Invalid MMIE */
579
580 bip_ipn_swap(ipn, mmie->sequence_number);
581
582 if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) {
583 key->u.aes_cmac.replays++;
584 return RX_DROP_UNUSABLE;
585 }
586
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100587 if (!(status->flag & RX_FLAG_DECRYPTED)) {
Jouni Malinen765cb462009-01-08 13:32:01 +0200588 /* hardware didn't decrypt/verify MIC */
589 bip_aad(skb, aad);
590 ieee80211_aes_cmac(key->u.aes_cmac.tfm,
591 key->u.aes_cmac.rx_crypto_buf, aad,
592 skb->data + 24, skb->len - 24, mic);
593 if (memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) {
594 key->u.aes_cmac.icverrors++;
595 return RX_DROP_UNUSABLE;
596 }
597 }
598
599 memcpy(key->u.aes_cmac.rx_pn, ipn, 6);
600
601 /* Remove MMIE */
602 skb_trim(skb, skb->len - sizeof(*mmie));
603
604 return RX_CONTINUE;
605}