Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2002-2004, Instant802 Networks, Inc. |
Jouni Malinen | 765cb46 | 2009-01-08 13:32:01 +0200 | [diff] [blame] | 3 | * Copyright 2008, Jouni Malinen <j@w1.fi> |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 4 | * |
| 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> |
| 12 | #include <linux/slab.h> |
| 13 | #include <linux/skbuff.h> |
| 14 | #include <linux/compiler.h> |
Harvey Harrison | f14df80 | 2008-07-02 11:05:35 -0700 | [diff] [blame] | 15 | #include <linux/ieee80211.h> |
| 16 | #include <asm/unaligned.h> |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 17 | #include <net/mac80211.h> |
Johannes Berg | eb063c1 | 2007-08-28 17:01:53 -0400 | [diff] [blame] | 18 | |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 19 | #include "ieee80211_i.h" |
| 20 | #include "michael.h" |
| 21 | #include "tkip.h" |
| 22 | #include "aes_ccm.h" |
Jouni Malinen | 765cb46 | 2009-01-08 13:32:01 +0200 | [diff] [blame] | 23 | #include "aes_cmac.h" |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 24 | #include "wpa.h" |
| 25 | |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 26 | ieee80211_tx_result |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 27 | ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 28 | { |
Harvey Harrison | 8e8862b | 2008-07-02 11:05:35 -0700 | [diff] [blame] | 29 | u8 *data, *key, *mic, key_offset; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 30 | size_t data_len; |
Harvey Harrison | 8e8862b | 2008-07-02 11:05:35 -0700 | [diff] [blame] | 31 | unsigned int hdrlen; |
| 32 | struct ieee80211_hdr *hdr; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 33 | struct sk_buff *skb = tx->skb; |
Johannes Berg | 813d766 | 2010-01-17 01:47:58 +0100 | [diff] [blame] | 34 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 35 | int authenticator; |
Johannes Berg | 23c0752 | 2008-05-29 10:38:53 +0200 | [diff] [blame] | 36 | int tail; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 37 | |
Harvey Harrison | c34498b | 2008-07-02 16:30:52 -0700 | [diff] [blame] | 38 | hdr = (struct ieee80211_hdr *)skb->data; |
Johannes Berg | 8f20fc2 | 2007-08-28 17:01:54 -0400 | [diff] [blame] | 39 | if (!tx->key || tx->key->conf.alg != ALG_TKIP || skb->len < 24 || |
Harvey Harrison | c34498b | 2008-07-02 16:30:52 -0700 | [diff] [blame] | 40 | !ieee80211_is_data_present(hdr->frame_control)) |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 41 | return TX_CONTINUE; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 42 | |
Harvey Harrison | 8e8862b | 2008-07-02 11:05:35 -0700 | [diff] [blame] | 43 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
| 44 | if (skb->len < hdrlen) |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 45 | return TX_DROP; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 46 | |
Harvey Harrison | 8e8862b | 2008-07-02 11:05:35 -0700 | [diff] [blame] | 47 | data = skb->data + hdrlen; |
| 48 | data_len = skb->len - hdrlen; |
| 49 | |
Johannes Berg | 813d766 | 2010-01-17 01:47:58 +0100 | [diff] [blame] | 50 | if (info->control.hw_key && |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 51 | !(tx->flags & IEEE80211_TX_FRAGMENTED) && |
Johannes Berg | 813d766 | 2010-01-17 01:47:58 +0100 | [diff] [blame] | 52 | !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC)) { |
| 53 | /* hwaccel - with no need for SW-generated MMIC */ |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 54 | return TX_CONTINUE; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 55 | } |
| 56 | |
Johannes Berg | 23c0752 | 2008-05-29 10:38:53 +0200 | [diff] [blame] | 57 | tail = MICHAEL_MIC_LEN; |
Johannes Berg | 813d766 | 2010-01-17 01:47:58 +0100 | [diff] [blame] | 58 | if (!info->control.hw_key) |
Johannes Berg | 23c0752 | 2008-05-29 10:38:53 +0200 | [diff] [blame] | 59 | 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 Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 64 | |
| 65 | #if 0 |
| 66 | authenticator = fc & IEEE80211_FCTL_FROMDS; /* FIX */ |
| 67 | #else |
| 68 | authenticator = 1; |
| 69 | #endif |
Luis R. Rodriguez | ffd7891 | 2008-06-21 10:02:46 -0400 | [diff] [blame] | 70 | 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 Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 74 | mic = skb_put(skb, MICHAEL_MIC_LEN); |
Harvey Harrison | 8e8862b | 2008-07-02 11:05:35 -0700 | [diff] [blame] | 75 | michael_mic(key, hdr, data, data_len, mic); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 76 | |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 77 | return TX_CONTINUE; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 78 | } |
| 79 | |
| 80 | |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 81 | ieee80211_rx_result |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 82 | ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 83 | { |
Harvey Harrison | 8e8862b | 2008-07-02 11:05:35 -0700 | [diff] [blame] | 84 | u8 *data, *key = NULL, key_offset; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 85 | size_t data_len; |
Harvey Harrison | 8e8862b | 2008-07-02 11:05:35 -0700 | [diff] [blame] | 86 | unsigned int hdrlen; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 87 | u8 mic[MICHAEL_MIC_LEN]; |
| 88 | struct sk_buff *skb = rx->skb; |
Johannes Berg | eb9fb5b8 | 2009-11-16 13:58:20 +0100 | [diff] [blame] | 89 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
| 90 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 91 | int authenticator = 1, wpa_test = 0; |
| 92 | |
Johannes Berg | c6a1fa1 | 2008-10-07 12:04:32 +0200 | [diff] [blame] | 93 | /* No way to verify the MIC if the hardware stripped it */ |
Johannes Berg | eb9fb5b8 | 2009-11-16 13:58:20 +0100 | [diff] [blame] | 94 | if (status->flag & RX_FLAG_MMIC_STRIPPED) |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 95 | return RX_CONTINUE; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 96 | |
Johannes Berg | 8f20fc2 | 2007-08-28 17:01:54 -0400 | [diff] [blame] | 97 | if (!rx->key || rx->key->conf.alg != ALG_TKIP || |
Harvey Harrison | c34498b | 2008-07-02 16:30:52 -0700 | [diff] [blame] | 98 | !ieee80211_has_protected(hdr->frame_control) || |
| 99 | !ieee80211_is_data_present(hdr->frame_control)) |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 100 | return RX_CONTINUE; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 101 | |
Harvey Harrison | 8e8862b | 2008-07-02 11:05:35 -0700 | [diff] [blame] | 102 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
| 103 | if (skb->len < hdrlen + MICHAEL_MIC_LEN) |
Johannes Berg | e4c26ad | 2008-01-31 19:48:21 +0100 | [diff] [blame] | 104 | return RX_DROP_UNUSABLE; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 105 | |
Harvey Harrison | 8e8862b | 2008-07-02 11:05:35 -0700 | [diff] [blame] | 106 | data = skb->data + hdrlen; |
| 107 | data_len = skb->len - hdrlen - MICHAEL_MIC_LEN; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 108 | |
| 109 | #if 0 |
| 110 | authenticator = fc & IEEE80211_FCTL_TODS; /* FIX */ |
| 111 | #else |
| 112 | authenticator = 1; |
| 113 | #endif |
Luis R. Rodriguez | ffd7891 | 2008-06-21 10:02:46 -0400 | [diff] [blame] | 114 | 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 Harrison | 8e8862b | 2008-07-02 11:05:35 -0700 | [diff] [blame] | 118 | michael_mic(key, hdr, data, data_len, mic); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 119 | if (memcmp(mic, data + data_len, MICHAEL_MIC_LEN) != 0 || wpa_test) { |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 120 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
Johannes Berg | e4c26ad | 2008-01-31 19:48:21 +0100 | [diff] [blame] | 121 | return RX_DROP_UNUSABLE; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 122 | |
Jasper Bryant-Greene | f698d85 | 2008-08-03 12:04:37 +1200 | [diff] [blame] | 123 | mac80211_ev_michael_mic_failure(rx->sdata, rx->key->conf.keyidx, |
Johannes Berg | e6d6e34 | 2009-07-01 21:26:47 +0200 | [diff] [blame] | 124 | (void *) skb->data, NULL, |
| 125 | GFP_ATOMIC); |
Johannes Berg | e4c26ad | 2008-01-31 19:48:21 +0100 | [diff] [blame] | 126 | return RX_DROP_UNUSABLE; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 127 | } |
| 128 | |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 129 | /* remove Michael MIC from payload */ |
| 130 | skb_trim(skb, skb->len - MICHAEL_MIC_LEN); |
| 131 | |
Johannes Berg | 50741ae | 2007-09-26 15:19:45 +0200 | [diff] [blame] | 132 | /* update IV in key information to be able to detect replays */ |
Harvey Harrison | b0f76b3 | 2008-05-14 16:26:19 -0700 | [diff] [blame] | 133 | rx->key->u.tkip.rx[rx->queue].iv32 = rx->tkip_iv32; |
| 134 | rx->key->u.tkip.rx[rx->queue].iv16 = rx->tkip_iv16; |
Johannes Berg | 50741ae | 2007-09-26 15:19:45 +0200 | [diff] [blame] | 135 | |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 136 | return RX_CONTINUE; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 137 | } |
| 138 | |
| 139 | |
Johannes Berg | e039fa4 | 2008-05-15 12:55:29 +0200 | [diff] [blame] | 140 | static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 141 | { |
| 142 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
| 143 | struct ieee80211_key *key = tx->key; |
Johannes Berg | e039fa4 | 2008-05-15 12:55:29 +0200 | [diff] [blame] | 144 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
Harvey Harrison | d5184ca | 2008-06-11 14:21:58 -0700 | [diff] [blame] | 145 | unsigned int hdrlen; |
| 146 | int len, tail; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 147 | u8 *pos; |
| 148 | |
Johannes Berg | 813d766 | 2010-01-17 01:47:58 +0100 | [diff] [blame] | 149 | 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 Berg | 23c0752 | 2008-05-29 10:38:53 +0200 | [diff] [blame] | 152 | return 0; |
Johannes Berg | e039fa4 | 2008-05-15 12:55:29 +0200 | [diff] [blame] | 153 | } |
| 154 | |
Harvey Harrison | d5184ca | 2008-06-11 14:21:58 -0700 | [diff] [blame] | 155 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 156 | len = skb->len - hdrlen; |
| 157 | |
Johannes Berg | 813d766 | 2010-01-17 01:47:58 +0100 | [diff] [blame] | 158 | if (info->control.hw_key) |
Johannes Berg | 23c0752 | 2008-05-29 10:38:53 +0200 | [diff] [blame] | 159 | tail = 0; |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 160 | else |
Johannes Berg | 23c0752 | 2008-05-29 10:38:53 +0200 | [diff] [blame] | 161 | tail = TKIP_ICV_LEN; |
Johannes Berg | 8f20fc2 | 2007-08-28 17:01:54 -0400 | [diff] [blame] | 162 | |
Johannes Berg | 23c0752 | 2008-05-29 10:38:53 +0200 | [diff] [blame] | 163 | if (WARN_ON(skb_tailroom(skb) < tail || |
| 164 | skb_headroom(skb) < TKIP_IV_LEN)) |
| 165 | return -1; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 166 | |
| 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 Harrison | b0f76b3 | 2008-05-14 16:26:19 -0700 | [diff] [blame] | 172 | key->u.tkip.tx.iv16++; |
| 173 | if (key->u.tkip.tx.iv16 == 0) |
| 174 | key->u.tkip.tx.iv32++; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 175 | |
Johannes Berg | 813d766 | 2010-01-17 01:47:58 +0100 | [diff] [blame] | 176 | pos = ieee80211_tkip_add_iv(pos, key, key->u.tkip.tx.iv16); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 177 | |
Johannes Berg | 813d766 | 2010-01-17 01:47:58 +0100 | [diff] [blame] | 178 | /* hwaccel - with software IV */ |
| 179 | if (info->control.hw_key) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 180 | return 0; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 181 | |
| 182 | /* Add room for ICV */ |
| 183 | skb_put(skb, TKIP_ICV_LEN); |
| 184 | |
| 185 | hdr = (struct ieee80211_hdr *) skb->data; |
| 186 | ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm, |
| 187 | key, pos, len, hdr->addr2); |
| 188 | return 0; |
| 189 | } |
| 190 | |
| 191 | |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 192 | ieee80211_tx_result |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 193 | ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 194 | { |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 195 | struct sk_buff *skb = tx->skb; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 196 | |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 197 | ieee80211_tx_set_protected(tx); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 198 | |
Johannes Berg | 2de8e0d | 2009-03-23 17:28:35 +0100 | [diff] [blame] | 199 | do { |
| 200 | if (tkip_encrypt_skb(tx, skb) < 0) |
| 201 | return TX_DROP; |
| 202 | } while ((skb = skb->next)); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 203 | |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 204 | return TX_CONTINUE; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 205 | } |
| 206 | |
| 207 | |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 208 | ieee80211_rx_result |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 209 | ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 210 | { |
| 211 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 212 | int hdrlen, res, hwaccel = 0, wpa_test = 0; |
| 213 | struct ieee80211_key *key = rx->key; |
| 214 | struct sk_buff *skb = rx->skb; |
Johannes Berg | eb9fb5b8 | 2009-11-16 13:58:20 +0100 | [diff] [blame] | 215 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 216 | |
Harvey Harrison | d5184ca | 2008-06-11 14:21:58 -0700 | [diff] [blame] | 217 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 218 | |
Harvey Harrison | c34498b | 2008-07-02 16:30:52 -0700 | [diff] [blame] | 219 | if (!ieee80211_is_data(hdr->frame_control)) |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 220 | return RX_CONTINUE; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 221 | |
| 222 | if (!rx->sta || skb->len - hdrlen < 12) |
Johannes Berg | e4c26ad | 2008-01-31 19:48:21 +0100 | [diff] [blame] | 223 | return RX_DROP_UNUSABLE; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 224 | |
Johannes Berg | eb9fb5b8 | 2009-11-16 13:58:20 +0100 | [diff] [blame] | 225 | if (status->flag & RX_FLAG_DECRYPTED) { |
| 226 | if (status->flag & RX_FLAG_IV_STRIPPED) { |
Johannes Berg | 7848ba7 | 2007-09-14 11:10:25 -0400 | [diff] [blame] | 227 | /* |
| 228 | * Hardware took care of all processing, including |
| 229 | * replay protection, and stripped the ICV/IV so |
| 230 | * we cannot do any checks here. |
| 231 | */ |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 232 | return RX_CONTINUE; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 233 | } |
| 234 | |
| 235 | /* let TKIP code verify IV, but skip decryption */ |
| 236 | hwaccel = 1; |
| 237 | } |
| 238 | |
| 239 | res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm, |
| 240 | key, skb->data + hdrlen, |
Johannes Berg | 17741cd | 2008-09-11 00:02:02 +0200 | [diff] [blame] | 241 | skb->len - hdrlen, rx->sta->sta.addr, |
Emmanuel Grumbach | 9ae4fda | 2008-03-20 15:06:42 +0200 | [diff] [blame] | 242 | hdr->addr1, hwaccel, rx->queue, |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 243 | &rx->tkip_iv32, |
| 244 | &rx->tkip_iv16); |
Johannes Berg | f4ea83d | 2008-06-30 15:10:46 +0200 | [diff] [blame] | 245 | if (res != TKIP_DECRYPT_OK || wpa_test) |
Johannes Berg | e4c26ad | 2008-01-31 19:48:21 +0100 | [diff] [blame] | 246 | return RX_DROP_UNUSABLE; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 247 | |
| 248 | /* Trim ICV */ |
| 249 | skb_trim(skb, skb->len - TKIP_ICV_LEN); |
| 250 | |
| 251 | /* Remove IV */ |
| 252 | memmove(skb->data + TKIP_IV_LEN, skb->data, hdrlen); |
| 253 | skb_pull(skb, TKIP_IV_LEN); |
| 254 | |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 255 | return RX_CONTINUE; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 256 | } |
| 257 | |
| 258 | |
Harvey Harrison | feccb46 | 2008-07-02 16:30:52 -0700 | [diff] [blame] | 259 | static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *scratch, |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 260 | int encrypted) |
| 261 | { |
Harvey Harrison | f14df80 | 2008-07-02 11:05:35 -0700 | [diff] [blame] | 262 | __le16 mask_fc; |
Jouni Malinen | fb73333 | 2009-01-08 13:32:00 +0200 | [diff] [blame] | 263 | int a4_included, mgmt; |
Harvey Harrison | f14df80 | 2008-07-02 11:05:35 -0700 | [diff] [blame] | 264 | u8 qos_tid; |
Harvey Harrison | feccb46 | 2008-07-02 16:30:52 -0700 | [diff] [blame] | 265 | u8 *b_0, *aad; |
Harvey Harrison | f14df80 | 2008-07-02 11:05:35 -0700 | [diff] [blame] | 266 | u16 data_len, len_a; |
| 267 | unsigned int hdrlen; |
| 268 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 269 | |
Harvey Harrison | feccb46 | 2008-07-02 16:30:52 -0700 | [diff] [blame] | 270 | b_0 = scratch + 3 * AES_BLOCK_LEN; |
| 271 | aad = scratch + 4 * AES_BLOCK_LEN; |
| 272 | |
Harvey Harrison | f14df80 | 2008-07-02 11:05:35 -0700 | [diff] [blame] | 273 | /* |
Jouni Malinen | fb73333 | 2009-01-08 13:32:00 +0200 | [diff] [blame] | 274 | * Mask FC: zero subtype b4 b5 b6 (if not mgmt) |
Harvey Harrison | f14df80 | 2008-07-02 11:05:35 -0700 | [diff] [blame] | 275 | * Retry, PwrMgt, MoreData; set Protected |
| 276 | */ |
Jouni Malinen | fb73333 | 2009-01-08 13:32:00 +0200 | [diff] [blame] | 277 | mgmt = ieee80211_is_mgmt(hdr->frame_control); |
Harvey Harrison | f14df80 | 2008-07-02 11:05:35 -0700 | [diff] [blame] | 278 | mask_fc = hdr->frame_control; |
Jouni Malinen | fb73333 | 2009-01-08 13:32:00 +0200 | [diff] [blame] | 279 | mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | |
Harvey Harrison | f14df80 | 2008-07-02 11:05:35 -0700 | [diff] [blame] | 280 | IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA); |
Jouni Malinen | fb73333 | 2009-01-08 13:32:00 +0200 | [diff] [blame] | 281 | if (!mgmt) |
| 282 | mask_fc &= ~cpu_to_le16(0x0070); |
Harvey Harrison | f14df80 | 2008-07-02 11:05:35 -0700 | [diff] [blame] | 283 | mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 284 | |
Harvey Harrison | f14df80 | 2008-07-02 11:05:35 -0700 | [diff] [blame] | 285 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
| 286 | len_a = hdrlen - 2; |
| 287 | a4_included = ieee80211_has_a4(hdr->frame_control); |
| 288 | |
| 289 | if (ieee80211_is_data_qos(hdr->frame_control)) |
| 290 | qos_tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; |
| 291 | else |
| 292 | qos_tid = 0; |
| 293 | |
| 294 | data_len = skb->len - hdrlen - CCMP_HDR_LEN; |
| 295 | if (encrypted) |
| 296 | data_len -= CCMP_MIC_LEN; |
| 297 | |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 298 | /* First block, b_0 */ |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 299 | b_0[0] = 0x59; /* flags: Adata: 1, M: 011, L: 001 */ |
Jouni Malinen | fb73333 | 2009-01-08 13:32:00 +0200 | [diff] [blame] | 300 | /* Nonce: Nonce Flags | A2 | PN |
| 301 | * Nonce Flags: Priority (b0..b3) | Management (b4) | Reserved (b5..b7) |
| 302 | */ |
| 303 | b_0[1] = qos_tid | (mgmt << 4); |
Harvey Harrison | 73e1f7c | 2008-07-02 11:05:34 -0700 | [diff] [blame] | 304 | memcpy(&b_0[2], hdr->addr2, ETH_ALEN); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 305 | memcpy(&b_0[8], pn, CCMP_PN_LEN); |
| 306 | /* l(m) */ |
Harvey Harrison | f14df80 | 2008-07-02 11:05:35 -0700 | [diff] [blame] | 307 | put_unaligned_be16(data_len, &b_0[14]); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 308 | |
| 309 | /* AAD (extra authenticate-only data) / masked 802.11 header |
| 310 | * FC | A1 | A2 | A3 | SC | [A4] | [QC] */ |
Harvey Harrison | f14df80 | 2008-07-02 11:05:35 -0700 | [diff] [blame] | 311 | put_unaligned_be16(len_a, &aad[0]); |
| 312 | put_unaligned(mask_fc, (__le16 *)&aad[2]); |
Harvey Harrison | 73e1f7c | 2008-07-02 11:05:34 -0700 | [diff] [blame] | 313 | memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 314 | |
| 315 | /* Mask Seq#, leave Frag# */ |
| 316 | aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f; |
| 317 | aad[23] = 0; |
Harvey Harrison | f14df80 | 2008-07-02 11:05:35 -0700 | [diff] [blame] | 318 | |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 319 | if (a4_included) { |
Harvey Harrison | 73e1f7c | 2008-07-02 11:05:34 -0700 | [diff] [blame] | 320 | memcpy(&aad[24], hdr->addr4, ETH_ALEN); |
Harvey Harrison | f14df80 | 2008-07-02 11:05:35 -0700 | [diff] [blame] | 321 | aad[30] = qos_tid; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 322 | aad[31] = 0; |
Harvey Harrison | f14df80 | 2008-07-02 11:05:35 -0700 | [diff] [blame] | 323 | } else { |
Harvey Harrison | 73e1f7c | 2008-07-02 11:05:34 -0700 | [diff] [blame] | 324 | memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN); |
Harvey Harrison | f14df80 | 2008-07-02 11:05:35 -0700 | [diff] [blame] | 325 | aad[24] = qos_tid; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 326 | } |
| 327 | } |
| 328 | |
| 329 | |
| 330 | static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn, int key_id) |
| 331 | { |
| 332 | hdr[0] = pn[5]; |
| 333 | hdr[1] = pn[4]; |
| 334 | hdr[2] = 0; |
| 335 | hdr[3] = 0x20 | (key_id << 6); |
| 336 | hdr[4] = pn[3]; |
| 337 | hdr[5] = pn[2]; |
| 338 | hdr[6] = pn[1]; |
| 339 | hdr[7] = pn[0]; |
| 340 | } |
| 341 | |
| 342 | |
Johannes Berg | c6a1fa1 | 2008-10-07 12:04:32 +0200 | [diff] [blame] | 343 | static inline void ccmp_hdr2pn(u8 *pn, u8 *hdr) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 344 | { |
| 345 | pn[0] = hdr[7]; |
| 346 | pn[1] = hdr[6]; |
| 347 | pn[2] = hdr[5]; |
| 348 | pn[3] = hdr[4]; |
| 349 | pn[4] = hdr[1]; |
| 350 | pn[5] = hdr[0]; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 351 | } |
| 352 | |
| 353 | |
Johannes Berg | e039fa4 | 2008-05-15 12:55:29 +0200 | [diff] [blame] | 354 | static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 355 | { |
| 356 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
| 357 | struct ieee80211_key *key = tx->key; |
Johannes Berg | e039fa4 | 2008-05-15 12:55:29 +0200 | [diff] [blame] | 358 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
Johannes Berg | 23c0752 | 2008-05-29 10:38:53 +0200 | [diff] [blame] | 359 | int hdrlen, len, tail; |
Harvey Harrison | feccb46 | 2008-07-02 16:30:52 -0700 | [diff] [blame] | 360 | u8 *pos, *pn; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 361 | int i; |
Jouni Malinen | 1f7d77a | 2009-01-08 13:32:10 +0200 | [diff] [blame] | 362 | |
Johannes Berg | 813d766 | 2010-01-17 01:47:58 +0100 | [diff] [blame] | 363 | if (info->control.hw_key && |
| 364 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV)) { |
| 365 | /* |
| 366 | * hwaccel has no need for preallocated room for CCMP |
| 367 | * header or MIC fields |
| 368 | */ |
Johannes Berg | 23c0752 | 2008-05-29 10:38:53 +0200 | [diff] [blame] | 369 | return 0; |
Johannes Berg | e039fa4 | 2008-05-15 12:55:29 +0200 | [diff] [blame] | 370 | } |
| 371 | |
Harvey Harrison | d5184ca | 2008-06-11 14:21:58 -0700 | [diff] [blame] | 372 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 373 | len = skb->len - hdrlen; |
| 374 | |
Johannes Berg | 813d766 | 2010-01-17 01:47:58 +0100 | [diff] [blame] | 375 | if (info->control.hw_key) |
Johannes Berg | 23c0752 | 2008-05-29 10:38:53 +0200 | [diff] [blame] | 376 | tail = 0; |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 377 | else |
Johannes Berg | 23c0752 | 2008-05-29 10:38:53 +0200 | [diff] [blame] | 378 | tail = CCMP_MIC_LEN; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 379 | |
Johannes Berg | 23c0752 | 2008-05-29 10:38:53 +0200 | [diff] [blame] | 380 | if (WARN_ON(skb_tailroom(skb) < tail || |
| 381 | skb_headroom(skb) < CCMP_HDR_LEN)) |
| 382 | return -1; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 383 | |
| 384 | pos = skb_push(skb, CCMP_HDR_LEN); |
| 385 | memmove(pos, pos + CCMP_HDR_LEN, hdrlen); |
| 386 | hdr = (struct ieee80211_hdr *) pos; |
| 387 | pos += hdrlen; |
| 388 | |
| 389 | /* PN = PN + 1 */ |
| 390 | pn = key->u.ccmp.tx_pn; |
| 391 | |
| 392 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { |
| 393 | pn[i]++; |
| 394 | if (pn[i]) |
| 395 | break; |
| 396 | } |
| 397 | |
Johannes Berg | 8f20fc2 | 2007-08-28 17:01:54 -0400 | [diff] [blame] | 398 | ccmp_pn2hdr(pos, pn, key->conf.keyidx); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 399 | |
Johannes Berg | 813d766 | 2010-01-17 01:47:58 +0100 | [diff] [blame] | 400 | /* hwaccel - with software CCMP header */ |
| 401 | if (info->control.hw_key) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 402 | return 0; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 403 | |
| 404 | pos += CCMP_HDR_LEN; |
Harvey Harrison | feccb46 | 2008-07-02 16:30:52 -0700 | [diff] [blame] | 405 | ccmp_special_blocks(skb, pn, key->u.ccmp.tx_crypto_buf, 0); |
| 406 | ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, key->u.ccmp.tx_crypto_buf, pos, len, |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 407 | pos, skb_put(skb, CCMP_MIC_LEN)); |
| 408 | |
| 409 | return 0; |
| 410 | } |
| 411 | |
| 412 | |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 413 | ieee80211_tx_result |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 414 | ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 415 | { |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 416 | struct sk_buff *skb = tx->skb; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 417 | |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 418 | ieee80211_tx_set_protected(tx); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 419 | |
Johannes Berg | 2de8e0d | 2009-03-23 17:28:35 +0100 | [diff] [blame] | 420 | do { |
| 421 | if (ccmp_encrypt_skb(tx, skb) < 0) |
| 422 | return TX_DROP; |
| 423 | } while ((skb = skb->next)); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 424 | |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 425 | return TX_CONTINUE; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 426 | } |
| 427 | |
| 428 | |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 429 | ieee80211_rx_result |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 430 | ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 431 | { |
Harvey Harrison | c34498b | 2008-07-02 16:30:52 -0700 | [diff] [blame] | 432 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 433 | int hdrlen; |
| 434 | struct ieee80211_key *key = rx->key; |
| 435 | struct sk_buff *skb = rx->skb; |
Johannes Berg | eb9fb5b8 | 2009-11-16 13:58:20 +0100 | [diff] [blame] | 436 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 437 | u8 pn[CCMP_PN_LEN]; |
| 438 | int data_len; |
| 439 | |
Harvey Harrison | d5184ca | 2008-06-11 14:21:58 -0700 | [diff] [blame] | 440 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 441 | |
Jouni Malinen | fb73333 | 2009-01-08 13:32:00 +0200 | [diff] [blame] | 442 | if (!ieee80211_is_data(hdr->frame_control) && |
| 443 | !ieee80211_is_robust_mgmt_frame(hdr)) |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 444 | return RX_CONTINUE; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 445 | |
| 446 | data_len = skb->len - hdrlen - CCMP_HDR_LEN - CCMP_MIC_LEN; |
| 447 | if (!rx->sta || data_len < 0) |
Johannes Berg | e4c26ad | 2008-01-31 19:48:21 +0100 | [diff] [blame] | 448 | return RX_DROP_UNUSABLE; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 449 | |
Johannes Berg | eb9fb5b8 | 2009-11-16 13:58:20 +0100 | [diff] [blame] | 450 | if ((status->flag & RX_FLAG_DECRYPTED) && |
| 451 | (status->flag & RX_FLAG_IV_STRIPPED)) |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 452 | return RX_CONTINUE; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 453 | |
Johannes Berg | c6a1fa1 | 2008-10-07 12:04:32 +0200 | [diff] [blame] | 454 | ccmp_hdr2pn(pn, skb->data + hdrlen); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 455 | |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 456 | if (memcmp(pn, key->u.ccmp.rx_pn[rx->queue], CCMP_PN_LEN) <= 0) { |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 457 | key->u.ccmp.replays++; |
Johannes Berg | e4c26ad | 2008-01-31 19:48:21 +0100 | [diff] [blame] | 458 | return RX_DROP_UNUSABLE; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 459 | } |
| 460 | |
Johannes Berg | eb9fb5b8 | 2009-11-16 13:58:20 +0100 | [diff] [blame] | 461 | if (!(status->flag & RX_FLAG_DECRYPTED)) { |
Johannes Berg | 7848ba7 | 2007-09-14 11:10:25 -0400 | [diff] [blame] | 462 | /* hardware didn't decrypt/verify MIC */ |
Harvey Harrison | feccb46 | 2008-07-02 16:30:52 -0700 | [diff] [blame] | 463 | ccmp_special_blocks(skb, pn, key->u.ccmp.rx_crypto_buf, 1); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 464 | |
| 465 | if (ieee80211_aes_ccm_decrypt( |
Harvey Harrison | feccb46 | 2008-07-02 16:30:52 -0700 | [diff] [blame] | 466 | key->u.ccmp.tfm, key->u.ccmp.rx_crypto_buf, |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 467 | skb->data + hdrlen + CCMP_HDR_LEN, data_len, |
| 468 | skb->data + skb->len - CCMP_MIC_LEN, |
Johannes Berg | c6a1fa1 | 2008-10-07 12:04:32 +0200 | [diff] [blame] | 469 | skb->data + hdrlen + CCMP_HDR_LEN)) |
Johannes Berg | e4c26ad | 2008-01-31 19:48:21 +0100 | [diff] [blame] | 470 | return RX_DROP_UNUSABLE; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 471 | } |
| 472 | |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 473 | memcpy(key->u.ccmp.rx_pn[rx->queue], pn, CCMP_PN_LEN); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 474 | |
| 475 | /* Remove CCMP header and MIC */ |
| 476 | skb_trim(skb, skb->len - CCMP_MIC_LEN); |
| 477 | memmove(skb->data + CCMP_HDR_LEN, skb->data, hdrlen); |
| 478 | skb_pull(skb, CCMP_HDR_LEN); |
| 479 | |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 480 | return RX_CONTINUE; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 481 | } |
Jouni Malinen | 765cb46 | 2009-01-08 13:32:01 +0200 | [diff] [blame] | 482 | |
| 483 | |
| 484 | static void bip_aad(struct sk_buff *skb, u8 *aad) |
| 485 | { |
| 486 | /* BIP AAD: FC(masked) || A1 || A2 || A3 */ |
| 487 | |
| 488 | /* FC type/subtype */ |
| 489 | aad[0] = skb->data[0]; |
| 490 | /* Mask FC Retry, PwrMgt, MoreData flags to zero */ |
| 491 | aad[1] = skb->data[1] & ~(BIT(4) | BIT(5) | BIT(6)); |
| 492 | /* A1 || A2 || A3 */ |
| 493 | memcpy(aad + 2, skb->data + 4, 3 * ETH_ALEN); |
| 494 | } |
| 495 | |
| 496 | |
| 497 | static inline void bip_ipn_swap(u8 *d, const u8 *s) |
| 498 | { |
| 499 | *d++ = s[5]; |
| 500 | *d++ = s[4]; |
| 501 | *d++ = s[3]; |
| 502 | *d++ = s[2]; |
| 503 | *d++ = s[1]; |
| 504 | *d = s[0]; |
| 505 | } |
| 506 | |
| 507 | |
| 508 | ieee80211_tx_result |
| 509 | ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx) |
| 510 | { |
| 511 | struct sk_buff *skb = tx->skb; |
| 512 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
| 513 | struct ieee80211_key *key = tx->key; |
| 514 | struct ieee80211_mmie *mmie; |
| 515 | u8 *pn, aad[20]; |
| 516 | int i; |
| 517 | |
Johannes Berg | 813d766 | 2010-01-17 01:47:58 +0100 | [diff] [blame] | 518 | if (info->control.hw_key) |
Jouni Malinen | 765cb46 | 2009-01-08 13:32:01 +0200 | [diff] [blame] | 519 | return 0; |
Jouni Malinen | 765cb46 | 2009-01-08 13:32:01 +0200 | [diff] [blame] | 520 | |
| 521 | if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie))) |
| 522 | return TX_DROP; |
| 523 | |
| 524 | mmie = (struct ieee80211_mmie *) skb_put(skb, sizeof(*mmie)); |
| 525 | mmie->element_id = WLAN_EID_MMIE; |
| 526 | mmie->length = sizeof(*mmie) - 2; |
| 527 | mmie->key_id = cpu_to_le16(key->conf.keyidx); |
| 528 | |
| 529 | /* PN = PN + 1 */ |
| 530 | pn = key->u.aes_cmac.tx_pn; |
| 531 | |
| 532 | for (i = sizeof(key->u.aes_cmac.tx_pn) - 1; i >= 0; i--) { |
| 533 | pn[i]++; |
| 534 | if (pn[i]) |
| 535 | break; |
| 536 | } |
| 537 | bip_ipn_swap(mmie->sequence_number, pn); |
| 538 | |
| 539 | bip_aad(skb, aad); |
| 540 | |
| 541 | /* |
| 542 | * MIC = AES-128-CMAC(IGTK, AAD || Management Frame Body || MMIE, 64) |
| 543 | */ |
| 544 | ieee80211_aes_cmac(key->u.aes_cmac.tfm, key->u.aes_cmac.tx_crypto_buf, |
| 545 | aad, skb->data + 24, skb->len - 24, mmie->mic); |
| 546 | |
| 547 | return TX_CONTINUE; |
| 548 | } |
| 549 | |
| 550 | |
| 551 | ieee80211_rx_result |
| 552 | ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx) |
| 553 | { |
| 554 | struct sk_buff *skb = rx->skb; |
Johannes Berg | eb9fb5b8 | 2009-11-16 13:58:20 +0100 | [diff] [blame] | 555 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
Jouni Malinen | 765cb46 | 2009-01-08 13:32:01 +0200 | [diff] [blame] | 556 | struct ieee80211_key *key = rx->key; |
| 557 | struct ieee80211_mmie *mmie; |
| 558 | u8 aad[20], mic[8], ipn[6]; |
| 559 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
| 560 | |
| 561 | if (!ieee80211_is_mgmt(hdr->frame_control)) |
| 562 | return RX_CONTINUE; |
| 563 | |
Johannes Berg | eb9fb5b8 | 2009-11-16 13:58:20 +0100 | [diff] [blame] | 564 | if ((status->flag & RX_FLAG_DECRYPTED) && |
| 565 | (status->flag & RX_FLAG_IV_STRIPPED)) |
Jouni Malinen | 765cb46 | 2009-01-08 13:32:01 +0200 | [diff] [blame] | 566 | return RX_CONTINUE; |
| 567 | |
| 568 | if (skb->len < 24 + sizeof(*mmie)) |
| 569 | return RX_DROP_UNUSABLE; |
| 570 | |
| 571 | mmie = (struct ieee80211_mmie *) |
| 572 | (skb->data + skb->len - sizeof(*mmie)); |
| 573 | if (mmie->element_id != WLAN_EID_MMIE || |
| 574 | mmie->length != sizeof(*mmie) - 2) |
| 575 | return RX_DROP_UNUSABLE; /* Invalid MMIE */ |
| 576 | |
| 577 | bip_ipn_swap(ipn, mmie->sequence_number); |
| 578 | |
| 579 | if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) { |
| 580 | key->u.aes_cmac.replays++; |
| 581 | return RX_DROP_UNUSABLE; |
| 582 | } |
| 583 | |
Johannes Berg | eb9fb5b8 | 2009-11-16 13:58:20 +0100 | [diff] [blame] | 584 | if (!(status->flag & RX_FLAG_DECRYPTED)) { |
Jouni Malinen | 765cb46 | 2009-01-08 13:32:01 +0200 | [diff] [blame] | 585 | /* hardware didn't decrypt/verify MIC */ |
| 586 | bip_aad(skb, aad); |
| 587 | ieee80211_aes_cmac(key->u.aes_cmac.tfm, |
| 588 | key->u.aes_cmac.rx_crypto_buf, aad, |
| 589 | skb->data + 24, skb->len - 24, mic); |
| 590 | if (memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) { |
| 591 | key->u.aes_cmac.icverrors++; |
| 592 | return RX_DROP_UNUSABLE; |
| 593 | } |
| 594 | } |
| 595 | |
| 596 | memcpy(key->u.aes_cmac.rx_pn, ipn, 6); |
| 597 | |
| 598 | /* Remove MMIE */ |
| 599 | skb_trim(skb, skb->len - sizeof(*mmie)); |
| 600 | |
| 601 | return RX_CONTINUE; |
| 602 | } |