blob: 43882b36da5559feaf60751c92a9b48fbc1c90fa [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 Bergeb063c12007-08-28 17:01:53 -040018
Jiri Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 11:45:53 -070028{
Harvey Harrison8e8862b2008-07-02 11:05:35 -070029 u8 *data, *key, *mic, key_offset;
Jiri Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 11:45:53 -070035 int authenticator;
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
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 Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 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 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{
Harvey Harrison8e8862b2008-07-02 11:05:35 -070084 u8 *data, *key = NULL, key_offset;
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 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 Bencf0706e82007-05-05 11:45:53 -070096
Johannes Berg97359d12010-08-10 09:46:38 +020097 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_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 Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 11:45:53 -0700127 }
128
Jiri Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 11:45:53 -0700177
Johannes Berg813d7662010-01-17 01:47:58 +0100178 /* hwaccel - with software IV */
179 if (info->control.hw_key)
Jiri Bencf0706e82007-05-05 11:45:53 -0700180 return 0;
Jiri Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 11:45:53 -0700193{
Jiri Bencf0706e82007-05-05 11:45:53 -0700194 struct sk_buff *skb = tx->skb;
Jiri Bencf0706e82007-05-05 11:45:53 -0700195
Johannes Berg5cf121c2008-02-25 16:27:43 +0100196 ieee80211_tx_set_protected(tx);
Jiri Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 11:45:53 -0700202
Johannes Berg9ae54c82008-01-31 19:48:20 +0100203 return TX_CONTINUE;
Jiri Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 11:45:53 -0700209{
210 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
Jiri Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 11:45:53 -0700215
Harvey Harrisond5184ca2008-06-11 14:21:58 -0700216 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Jiri Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 11:45:53 -0700223
Johannes Bergdc1580d2010-08-10 09:46:40 +0200224 /*
225 * Let TKIP code verify IV, but skip decryption.
226 * In the case where hardware checks the IV as well,
227 * we don't even get here, see ieee80211_rx_h_decrypt()
228 */
229 if (status->flag & RX_FLAG_DECRYPTED)
Jiri Bencf0706e82007-05-05 11:45:53 -0700230 hwaccel = 1;
Jiri Bencf0706e82007-05-05 11:45:53 -0700231
232 res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm,
233 key, skb->data + hdrlen,
Johannes Berg17741cd2008-09-11 00:02:02 +0200234 skb->len - hdrlen, rx->sta->sta.addr,
Emmanuel Grumbach9ae4fda2008-03-20 15:06:42 +0200235 hdr->addr1, hwaccel, rx->queue,
Johannes Berg5cf121c2008-02-25 16:27:43 +0100236 &rx->tkip_iv32,
237 &rx->tkip_iv16);
Johannes Bergf4ea83d2008-06-30 15:10:46 +0200238 if (res != TKIP_DECRYPT_OK || wpa_test)
Johannes Berge4c26ad2008-01-31 19:48:21 +0100239 return RX_DROP_UNUSABLE;
Jiri Bencf0706e82007-05-05 11:45:53 -0700240
241 /* Trim ICV */
242 skb_trim(skb, skb->len - TKIP_ICV_LEN);
243
244 /* Remove IV */
245 memmove(skb->data + TKIP_IV_LEN, skb->data, hdrlen);
246 skb_pull(skb, TKIP_IV_LEN);
247
Johannes Berg9ae54c82008-01-31 19:48:20 +0100248 return RX_CONTINUE;
Jiri Bencf0706e82007-05-05 11:45:53 -0700249}
250
251
Harvey Harrisonfeccb462008-07-02 16:30:52 -0700252static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *scratch,
Jiri Bencf0706e82007-05-05 11:45:53 -0700253 int encrypted)
254{
Harvey Harrisonf14df802008-07-02 11:05:35 -0700255 __le16 mask_fc;
Jouni Malinenfb733332009-01-08 13:32:00 +0200256 int a4_included, mgmt;
Harvey Harrisonf14df802008-07-02 11:05:35 -0700257 u8 qos_tid;
Harvey Harrisonfeccb462008-07-02 16:30:52 -0700258 u8 *b_0, *aad;
Harvey Harrisonf14df802008-07-02 11:05:35 -0700259 u16 data_len, len_a;
260 unsigned int hdrlen;
261 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
Jiri Bencf0706e82007-05-05 11:45:53 -0700262
Harvey Harrisonfeccb462008-07-02 16:30:52 -0700263 b_0 = scratch + 3 * AES_BLOCK_LEN;
264 aad = scratch + 4 * AES_BLOCK_LEN;
265
Harvey Harrisonf14df802008-07-02 11:05:35 -0700266 /*
Jouni Malinenfb733332009-01-08 13:32:00 +0200267 * Mask FC: zero subtype b4 b5 b6 (if not mgmt)
Harvey Harrisonf14df802008-07-02 11:05:35 -0700268 * Retry, PwrMgt, MoreData; set Protected
269 */
Jouni Malinenfb733332009-01-08 13:32:00 +0200270 mgmt = ieee80211_is_mgmt(hdr->frame_control);
Harvey Harrisonf14df802008-07-02 11:05:35 -0700271 mask_fc = hdr->frame_control;
Jouni Malinenfb733332009-01-08 13:32:00 +0200272 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY |
Harvey Harrisonf14df802008-07-02 11:05:35 -0700273 IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA);
Jouni Malinenfb733332009-01-08 13:32:00 +0200274 if (!mgmt)
275 mask_fc &= ~cpu_to_le16(0x0070);
Harvey Harrisonf14df802008-07-02 11:05:35 -0700276 mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
Jiri Bencf0706e82007-05-05 11:45:53 -0700277
Harvey Harrisonf14df802008-07-02 11:05:35 -0700278 hdrlen = ieee80211_hdrlen(hdr->frame_control);
279 len_a = hdrlen - 2;
280 a4_included = ieee80211_has_a4(hdr->frame_control);
281
282 if (ieee80211_is_data_qos(hdr->frame_control))
283 qos_tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
284 else
285 qos_tid = 0;
286
287 data_len = skb->len - hdrlen - CCMP_HDR_LEN;
288 if (encrypted)
289 data_len -= CCMP_MIC_LEN;
290
Jiri Bencf0706e82007-05-05 11:45:53 -0700291 /* First block, b_0 */
Jiri Bencf0706e82007-05-05 11:45:53 -0700292 b_0[0] = 0x59; /* flags: Adata: 1, M: 011, L: 001 */
Jouni Malinenfb733332009-01-08 13:32:00 +0200293 /* Nonce: Nonce Flags | A2 | PN
294 * Nonce Flags: Priority (b0..b3) | Management (b4) | Reserved (b5..b7)
295 */
296 b_0[1] = qos_tid | (mgmt << 4);
Harvey Harrison73e1f7c2008-07-02 11:05:34 -0700297 memcpy(&b_0[2], hdr->addr2, ETH_ALEN);
Jiri Bencf0706e82007-05-05 11:45:53 -0700298 memcpy(&b_0[8], pn, CCMP_PN_LEN);
299 /* l(m) */
Harvey Harrisonf14df802008-07-02 11:05:35 -0700300 put_unaligned_be16(data_len, &b_0[14]);
Jiri Bencf0706e82007-05-05 11:45:53 -0700301
302 /* AAD (extra authenticate-only data) / masked 802.11 header
303 * FC | A1 | A2 | A3 | SC | [A4] | [QC] */
Harvey Harrisonf14df802008-07-02 11:05:35 -0700304 put_unaligned_be16(len_a, &aad[0]);
305 put_unaligned(mask_fc, (__le16 *)&aad[2]);
Harvey Harrison73e1f7c2008-07-02 11:05:34 -0700306 memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN);
Jiri Bencf0706e82007-05-05 11:45:53 -0700307
308 /* Mask Seq#, leave Frag# */
309 aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f;
310 aad[23] = 0;
Harvey Harrisonf14df802008-07-02 11:05:35 -0700311
Jiri Bencf0706e82007-05-05 11:45:53 -0700312 if (a4_included) {
Harvey Harrison73e1f7c2008-07-02 11:05:34 -0700313 memcpy(&aad[24], hdr->addr4, ETH_ALEN);
Harvey Harrisonf14df802008-07-02 11:05:35 -0700314 aad[30] = qos_tid;
Jiri Bencf0706e82007-05-05 11:45:53 -0700315 aad[31] = 0;
Harvey Harrisonf14df802008-07-02 11:05:35 -0700316 } else {
Harvey Harrison73e1f7c2008-07-02 11:05:34 -0700317 memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
Harvey Harrisonf14df802008-07-02 11:05:35 -0700318 aad[24] = qos_tid;
Jiri Bencf0706e82007-05-05 11:45:53 -0700319 }
320}
321
322
323static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn, int key_id)
324{
325 hdr[0] = pn[5];
326 hdr[1] = pn[4];
327 hdr[2] = 0;
328 hdr[3] = 0x20 | (key_id << 6);
329 hdr[4] = pn[3];
330 hdr[5] = pn[2];
331 hdr[6] = pn[1];
332 hdr[7] = pn[0];
333}
334
335
Johannes Bergc6a1fa12008-10-07 12:04:32 +0200336static inline void ccmp_hdr2pn(u8 *pn, u8 *hdr)
Jiri Bencf0706e82007-05-05 11:45:53 -0700337{
338 pn[0] = hdr[7];
339 pn[1] = hdr[6];
340 pn[2] = hdr[5];
341 pn[3] = hdr[4];
342 pn[4] = hdr[1];
343 pn[5] = hdr[0];
Jiri Bencf0706e82007-05-05 11:45:53 -0700344}
345
346
Johannes Berge039fa42008-05-15 12:55:29 +0200347static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
Jiri Bencf0706e82007-05-05 11:45:53 -0700348{
349 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
350 struct ieee80211_key *key = tx->key;
Johannes Berge039fa42008-05-15 12:55:29 +0200351 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Johannes Berg23c07522008-05-29 10:38:53 +0200352 int hdrlen, len, tail;
Harvey Harrisonfeccb462008-07-02 16:30:52 -0700353 u8 *pos, *pn;
Jiri Bencf0706e82007-05-05 11:45:53 -0700354 int i;
Jouni Malinen1f7d77a2009-01-08 13:32:10 +0200355
Johannes Berg813d7662010-01-17 01:47:58 +0100356 if (info->control.hw_key &&
357 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV)) {
358 /*
359 * hwaccel has no need for preallocated room for CCMP
360 * header or MIC fields
361 */
Johannes Berg23c07522008-05-29 10:38:53 +0200362 return 0;
Johannes Berge039fa42008-05-15 12:55:29 +0200363 }
364
Harvey Harrisond5184ca2008-06-11 14:21:58 -0700365 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Jiri Bencf0706e82007-05-05 11:45:53 -0700366 len = skb->len - hdrlen;
367
Johannes Berg813d7662010-01-17 01:47:58 +0100368 if (info->control.hw_key)
Johannes Berg23c07522008-05-29 10:38:53 +0200369 tail = 0;
Johannes Berg11a843b2007-08-28 17:01:55 -0400370 else
Johannes Berg23c07522008-05-29 10:38:53 +0200371 tail = CCMP_MIC_LEN;
Jiri Bencf0706e82007-05-05 11:45:53 -0700372
Johannes Berg23c07522008-05-29 10:38:53 +0200373 if (WARN_ON(skb_tailroom(skb) < tail ||
374 skb_headroom(skb) < CCMP_HDR_LEN))
375 return -1;
Jiri Bencf0706e82007-05-05 11:45:53 -0700376
377 pos = skb_push(skb, CCMP_HDR_LEN);
378 memmove(pos, pos + CCMP_HDR_LEN, hdrlen);
379 hdr = (struct ieee80211_hdr *) pos;
380 pos += hdrlen;
381
382 /* PN = PN + 1 */
383 pn = key->u.ccmp.tx_pn;
384
385 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
386 pn[i]++;
387 if (pn[i])
388 break;
389 }
390
Johannes Berg8f20fc22007-08-28 17:01:54 -0400391 ccmp_pn2hdr(pos, pn, key->conf.keyidx);
Jiri Bencf0706e82007-05-05 11:45:53 -0700392
Johannes Berg813d7662010-01-17 01:47:58 +0100393 /* hwaccel - with software CCMP header */
394 if (info->control.hw_key)
Jiri Bencf0706e82007-05-05 11:45:53 -0700395 return 0;
Jiri Bencf0706e82007-05-05 11:45:53 -0700396
397 pos += CCMP_HDR_LEN;
Harvey Harrisonfeccb462008-07-02 16:30:52 -0700398 ccmp_special_blocks(skb, pn, key->u.ccmp.tx_crypto_buf, 0);
399 ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, key->u.ccmp.tx_crypto_buf, pos, len,
Jiri Bencf0706e82007-05-05 11:45:53 -0700400 pos, skb_put(skb, CCMP_MIC_LEN));
401
402 return 0;
403}
404
405
Johannes Berg9ae54c82008-01-31 19:48:20 +0100406ieee80211_tx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100407ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx)
Jiri Bencf0706e82007-05-05 11:45:53 -0700408{
Jiri Bencf0706e82007-05-05 11:45:53 -0700409 struct sk_buff *skb = tx->skb;
Jiri Bencf0706e82007-05-05 11:45:53 -0700410
Johannes Berg5cf121c2008-02-25 16:27:43 +0100411 ieee80211_tx_set_protected(tx);
Jiri Bencf0706e82007-05-05 11:45:53 -0700412
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100413 do {
414 if (ccmp_encrypt_skb(tx, skb) < 0)
415 return TX_DROP;
416 } while ((skb = skb->next));
Jiri Bencf0706e82007-05-05 11:45:53 -0700417
Johannes Berg9ae54c82008-01-31 19:48:20 +0100418 return TX_CONTINUE;
Jiri Bencf0706e82007-05-05 11:45:53 -0700419}
420
421
Johannes Berg9ae54c82008-01-31 19:48:20 +0100422ieee80211_rx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100423ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx)
Jiri Bencf0706e82007-05-05 11:45:53 -0700424{
Harvey Harrisonc34498b2008-07-02 16:30:52 -0700425 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Jiri Bencf0706e82007-05-05 11:45:53 -0700426 int hdrlen;
427 struct ieee80211_key *key = rx->key;
428 struct sk_buff *skb = rx->skb;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100429 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Jiri Bencf0706e82007-05-05 11:45:53 -0700430 u8 pn[CCMP_PN_LEN];
431 int data_len;
Jouni Malinen91902522010-06-11 10:27:33 -0700432 int queue;
Jiri Bencf0706e82007-05-05 11:45:53 -0700433
Harvey Harrisond5184ca2008-06-11 14:21:58 -0700434 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Jiri Bencf0706e82007-05-05 11:45:53 -0700435
Jouni Malinenfb733332009-01-08 13:32:00 +0200436 if (!ieee80211_is_data(hdr->frame_control) &&
437 !ieee80211_is_robust_mgmt_frame(hdr))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100438 return RX_CONTINUE;
Jiri Bencf0706e82007-05-05 11:45:53 -0700439
440 data_len = skb->len - hdrlen - CCMP_HDR_LEN - CCMP_MIC_LEN;
441 if (!rx->sta || data_len < 0)
Johannes Berge4c26ad2008-01-31 19:48:21 +0100442 return RX_DROP_UNUSABLE;
Jiri Bencf0706e82007-05-05 11:45:53 -0700443
Johannes Bergc6a1fa12008-10-07 12:04:32 +0200444 ccmp_hdr2pn(pn, skb->data + hdrlen);
Jiri Bencf0706e82007-05-05 11:45:53 -0700445
Jouni Malinen91902522010-06-11 10:27:33 -0700446 queue = ieee80211_is_mgmt(hdr->frame_control) ?
447 NUM_RX_DATA_QUEUES : rx->queue;
448
449 if (memcmp(pn, key->u.ccmp.rx_pn[queue], CCMP_PN_LEN) <= 0) {
Jiri Bencf0706e82007-05-05 11:45:53 -0700450 key->u.ccmp.replays++;
Johannes Berge4c26ad2008-01-31 19:48:21 +0100451 return RX_DROP_UNUSABLE;
Jiri Bencf0706e82007-05-05 11:45:53 -0700452 }
453
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100454 if (!(status->flag & RX_FLAG_DECRYPTED)) {
Johannes Berg7848ba72007-09-14 11:10:25 -0400455 /* hardware didn't decrypt/verify MIC */
Harvey Harrisonfeccb462008-07-02 16:30:52 -0700456 ccmp_special_blocks(skb, pn, key->u.ccmp.rx_crypto_buf, 1);
Jiri Bencf0706e82007-05-05 11:45:53 -0700457
458 if (ieee80211_aes_ccm_decrypt(
Harvey Harrisonfeccb462008-07-02 16:30:52 -0700459 key->u.ccmp.tfm, key->u.ccmp.rx_crypto_buf,
Jiri Bencf0706e82007-05-05 11:45:53 -0700460 skb->data + hdrlen + CCMP_HDR_LEN, data_len,
461 skb->data + skb->len - CCMP_MIC_LEN,
Johannes Bergc6a1fa12008-10-07 12:04:32 +0200462 skb->data + hdrlen + CCMP_HDR_LEN))
Johannes Berge4c26ad2008-01-31 19:48:21 +0100463 return RX_DROP_UNUSABLE;
Jiri Bencf0706e82007-05-05 11:45:53 -0700464 }
465
Jouni Malinen91902522010-06-11 10:27:33 -0700466 memcpy(key->u.ccmp.rx_pn[queue], pn, CCMP_PN_LEN);
Jiri Bencf0706e82007-05-05 11:45:53 -0700467
468 /* Remove CCMP header and MIC */
469 skb_trim(skb, skb->len - CCMP_MIC_LEN);
470 memmove(skb->data + CCMP_HDR_LEN, skb->data, hdrlen);
471 skb_pull(skb, CCMP_HDR_LEN);
472
Johannes Berg9ae54c82008-01-31 19:48:20 +0100473 return RX_CONTINUE;
Jiri Bencf0706e82007-05-05 11:45:53 -0700474}
Jouni Malinen765cb462009-01-08 13:32:01 +0200475
476
477static void bip_aad(struct sk_buff *skb, u8 *aad)
478{
479 /* BIP AAD: FC(masked) || A1 || A2 || A3 */
480
481 /* FC type/subtype */
482 aad[0] = skb->data[0];
483 /* Mask FC Retry, PwrMgt, MoreData flags to zero */
484 aad[1] = skb->data[1] & ~(BIT(4) | BIT(5) | BIT(6));
485 /* A1 || A2 || A3 */
486 memcpy(aad + 2, skb->data + 4, 3 * ETH_ALEN);
487}
488
489
490static inline void bip_ipn_swap(u8 *d, const u8 *s)
491{
492 *d++ = s[5];
493 *d++ = s[4];
494 *d++ = s[3];
495 *d++ = s[2];
496 *d++ = s[1];
497 *d = s[0];
498}
499
500
501ieee80211_tx_result
502ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx)
503{
504 struct sk_buff *skb = tx->skb;
505 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
506 struct ieee80211_key *key = tx->key;
507 struct ieee80211_mmie *mmie;
508 u8 *pn, aad[20];
509 int i;
510
Johannes Berg813d7662010-01-17 01:47:58 +0100511 if (info->control.hw_key)
Jouni Malinen765cb462009-01-08 13:32:01 +0200512 return 0;
Jouni Malinen765cb462009-01-08 13:32:01 +0200513
514 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
515 return TX_DROP;
516
517 mmie = (struct ieee80211_mmie *) skb_put(skb, sizeof(*mmie));
518 mmie->element_id = WLAN_EID_MMIE;
519 mmie->length = sizeof(*mmie) - 2;
520 mmie->key_id = cpu_to_le16(key->conf.keyidx);
521
522 /* PN = PN + 1 */
523 pn = key->u.aes_cmac.tx_pn;
524
525 for (i = sizeof(key->u.aes_cmac.tx_pn) - 1; i >= 0; i--) {
526 pn[i]++;
527 if (pn[i])
528 break;
529 }
530 bip_ipn_swap(mmie->sequence_number, pn);
531
532 bip_aad(skb, aad);
533
534 /*
535 * MIC = AES-128-CMAC(IGTK, AAD || Management Frame Body || MMIE, 64)
536 */
537 ieee80211_aes_cmac(key->u.aes_cmac.tfm, key->u.aes_cmac.tx_crypto_buf,
538 aad, skb->data + 24, skb->len - 24, mmie->mic);
539
540 return TX_CONTINUE;
541}
542
543
544ieee80211_rx_result
545ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx)
546{
547 struct sk_buff *skb = rx->skb;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100548 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Jouni Malinen765cb462009-01-08 13:32:01 +0200549 struct ieee80211_key *key = rx->key;
550 struct ieee80211_mmie *mmie;
551 u8 aad[20], mic[8], ipn[6];
552 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
553
554 if (!ieee80211_is_mgmt(hdr->frame_control))
555 return RX_CONTINUE;
556
Jouni Malinen765cb462009-01-08 13:32:01 +0200557 if (skb->len < 24 + sizeof(*mmie))
558 return RX_DROP_UNUSABLE;
559
560 mmie = (struct ieee80211_mmie *)
561 (skb->data + skb->len - sizeof(*mmie));
562 if (mmie->element_id != WLAN_EID_MMIE ||
563 mmie->length != sizeof(*mmie) - 2)
564 return RX_DROP_UNUSABLE; /* Invalid MMIE */
565
566 bip_ipn_swap(ipn, mmie->sequence_number);
567
568 if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) {
569 key->u.aes_cmac.replays++;
570 return RX_DROP_UNUSABLE;
571 }
572
Johannes Bergeb9fb5b2009-11-16 13:58:20 +0100573 if (!(status->flag & RX_FLAG_DECRYPTED)) {
Jouni Malinen765cb462009-01-08 13:32:01 +0200574 /* hardware didn't decrypt/verify MIC */
575 bip_aad(skb, aad);
576 ieee80211_aes_cmac(key->u.aes_cmac.tfm,
577 key->u.aes_cmac.rx_crypto_buf, aad,
578 skb->data + 24, skb->len - 24, mic);
579 if (memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) {
580 key->u.aes_cmac.icverrors++;
581 return RX_DROP_UNUSABLE;
582 }
583 }
584
585 memcpy(key->u.aes_cmac.rx_pn, ipn, 6);
586
587 /* Remove MMIE */
588 skb_trim(skb, skb->len - sizeof(*mmie));
589
590 return RX_CONTINUE;
591}