Commit | Line | Data |
---|---|---|
f0706e82 JB |
1 | /* |
2 | * Copyright 2002-2004, Instant802 Networks, Inc. | |
765cb46a | 3 | * Copyright 2008, Jouni Malinen <j@w1.fi> |
f0706e82 JB |
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> | |
f0706e82 JB |
12 | #include <linux/skbuff.h> |
13 | #include <linux/compiler.h> | |
f14df804 | 14 | #include <linux/ieee80211.h> |
5a0e3ad6 | 15 | #include <linux/gfp.h> |
f14df804 | 16 | #include <asm/unaligned.h> |
f0706e82 | 17 | #include <net/mac80211.h> |
aba83a0b | 18 | #include <crypto/aes.h> |
eb063c17 | 19 | |
f0706e82 JB |
20 | #include "ieee80211_i.h" |
21 | #include "michael.h" | |
22 | #include "tkip.h" | |
23 | #include "aes_ccm.h" | |
765cb46a | 24 | #include "aes_cmac.h" |
f0706e82 JB |
25 | #include "wpa.h" |
26 | ||
9ae54c84 | 27 | ieee80211_tx_result |
5cf121c3 | 28 | ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx) |
f0706e82 | 29 | { |
747d753d | 30 | u8 *data, *key, *mic; |
f0706e82 | 31 | size_t data_len; |
8e8862b7 HH |
32 | unsigned int hdrlen; |
33 | struct ieee80211_hdr *hdr; | |
f0706e82 | 34 | struct sk_buff *skb = tx->skb; |
813d7669 | 35 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
23c0752a | 36 | int tail; |
f0706e82 | 37 | |
c34498b9 | 38 | hdr = (struct ieee80211_hdr *)skb->data; |
97359d12 JB |
39 | if (!tx->key || tx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP || |
40 | skb->len < 24 || !ieee80211_is_data_present(hdr->frame_control)) | |
9ae54c84 | 41 | return TX_CONTINUE; |
f0706e82 | 42 | |
8e8862b7 HH |
43 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
44 | if (skb->len < hdrlen) | |
9ae54c84 | 45 | return TX_DROP; |
f0706e82 | 46 | |
8e8862b7 HH |
47 | data = skb->data + hdrlen; |
48 | data_len = skb->len - hdrlen; | |
49 | ||
681d1190 JM |
50 | if (unlikely(info->flags & IEEE80211_TX_INTFL_TKIP_MIC_FAILURE)) { |
51 | /* Need to use software crypto for the test */ | |
52 | info->control.hw_key = NULL; | |
53 | } | |
54 | ||
813d7669 | 55 | if (info->control.hw_key && |
a26eb27a JB |
56 | (info->flags & IEEE80211_TX_CTL_DONTFRAG || |
57 | tx->local->ops->set_frag_threshold) && | |
813d7669 JB |
58 | !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC)) { |
59 | /* hwaccel - with no need for SW-generated MMIC */ | |
9ae54c84 | 60 | return TX_CONTINUE; |
f0706e82 JB |
61 | } |
62 | ||
23c0752a | 63 | tail = MICHAEL_MIC_LEN; |
813d7669 | 64 | if (!info->control.hw_key) |
23c0752a JB |
65 | tail += TKIP_ICV_LEN; |
66 | ||
67 | if (WARN_ON(skb_tailroom(skb) < tail || | |
68 | skb_headroom(skb) < TKIP_IV_LEN)) | |
69 | return TX_DROP; | |
f0706e82 | 70 | |
747d753d | 71 | key = &tx->key->conf.key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY]; |
f0706e82 | 72 | mic = skb_put(skb, MICHAEL_MIC_LEN); |
8e8862b7 | 73 | michael_mic(key, hdr, data, data_len, mic); |
681d1190 JM |
74 | if (unlikely(info->flags & IEEE80211_TX_INTFL_TKIP_MIC_FAILURE)) |
75 | mic[0]++; | |
f0706e82 | 76 | |
9ae54c84 | 77 | return TX_CONTINUE; |
f0706e82 JB |
78 | } |
79 | ||
80 | ||
9ae54c84 | 81 | ieee80211_rx_result |
5cf121c3 | 82 | ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx) |
f0706e82 | 83 | { |
747d753d | 84 | u8 *data, *key = NULL; |
f0706e82 | 85 | size_t data_len; |
8e8862b7 | 86 | unsigned int hdrlen; |
f0706e82 JB |
87 | u8 mic[MICHAEL_MIC_LEN]; |
88 | struct sk_buff *skb = rx->skb; | |
eb9fb5b8 JB |
89 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
90 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
f0706e82 | 91 | |
816c04fe CL |
92 | /* |
93 | * it makes no sense to check for MIC errors on anything other | |
94 | * than data frames. | |
95 | */ | |
96 | if (!ieee80211_is_data_present(hdr->frame_control)) | |
9ae54c84 | 97 | return RX_CONTINUE; |
f0706e82 | 98 | |
816c04fe CL |
99 | /* |
100 | * No way to verify the MIC if the hardware stripped it or | |
101 | * the IV with the key index. In this case we have solely rely | |
102 | * on the driver to set RX_FLAG_MMIC_ERROR in the event of a | |
103 | * MIC failure report. | |
104 | */ | |
105 | if (status->flag & (RX_FLAG_MMIC_STRIPPED | RX_FLAG_IV_STRIPPED)) { | |
106 | if (status->flag & RX_FLAG_MMIC_ERROR) | |
b98ea058 | 107 | goto mic_fail_no_key; |
816c04fe | 108 | |
4045f72b SG |
109 | if (!(status->flag & RX_FLAG_IV_STRIPPED) && rx->key && |
110 | rx->key->conf.cipher == WLAN_CIPHER_SUITE_TKIP) | |
816c04fe CL |
111 | goto update_iv; |
112 | ||
113 | return RX_CONTINUE; | |
114 | } | |
115 | ||
116 | /* | |
117 | * Some hardware seems to generate Michael MIC failure reports; even | |
118 | * though, the frame was not encrypted with TKIP and therefore has no | |
119 | * MIC. Ignore the flag them to avoid triggering countermeasures. | |
120 | */ | |
97359d12 | 121 | if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP || |
816c04fe | 122 | !(status->flag & RX_FLAG_DECRYPTED)) |
9ae54c84 | 123 | return RX_CONTINUE; |
f0706e82 | 124 | |
816c04fe CL |
125 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP && rx->key->conf.keyidx) { |
126 | /* | |
127 | * APs with pairwise keys should never receive Michael MIC | |
128 | * errors for non-zero keyidx because these are reserved for | |
129 | * group keys and only the AP is sending real multicast | |
130 | * frames in the BSS. ( | |
131 | */ | |
132 | return RX_DROP_UNUSABLE; | |
133 | } | |
134 | ||
135 | if (status->flag & RX_FLAG_MMIC_ERROR) | |
136 | goto mic_fail; | |
137 | ||
8e8862b7 HH |
138 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
139 | if (skb->len < hdrlen + MICHAEL_MIC_LEN) | |
e4c26add | 140 | return RX_DROP_UNUSABLE; |
f0706e82 | 141 | |
a8286911 JB |
142 | if (skb_linearize(rx->skb)) |
143 | return RX_DROP_UNUSABLE; | |
144 | hdr = (void *)skb->data; | |
145 | ||
8e8862b7 HH |
146 | data = skb->data + hdrlen; |
147 | data_len = skb->len - hdrlen - MICHAEL_MIC_LEN; | |
747d753d | 148 | key = &rx->key->conf.key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY]; |
8e8862b7 | 149 | michael_mic(key, hdr, data, data_len, mic); |
816c04fe CL |
150 | if (memcmp(mic, data + data_len, MICHAEL_MIC_LEN) != 0) |
151 | goto mic_fail; | |
f0706e82 | 152 | |
f0706e82 JB |
153 | /* remove Michael MIC from payload */ |
154 | skb_trim(skb, skb->len - MICHAEL_MIC_LEN); | |
155 | ||
816c04fe | 156 | update_iv: |
50741ae0 | 157 | /* update IV in key information to be able to detect replays */ |
9e26297a JB |
158 | rx->key->u.tkip.rx[rx->security_idx].iv32 = rx->tkip_iv32; |
159 | rx->key->u.tkip.rx[rx->security_idx].iv16 = rx->tkip_iv16; | |
50741ae0 | 160 | |
9ae54c84 | 161 | return RX_CONTINUE; |
816c04fe CL |
162 | |
163 | mic_fail: | |
b98ea058 S |
164 | rx->key->u.tkip.mic_failures++; |
165 | ||
166 | mic_fail_no_key: | |
a66b98db AN |
167 | /* |
168 | * In some cases the key can be unset - e.g. a multicast packet, in | |
169 | * a driver that supports HW encryption. Send up the key idx only if | |
170 | * the key is set. | |
171 | */ | |
172 | mac80211_ev_michael_mic_failure(rx->sdata, | |
173 | rx->key ? rx->key->conf.keyidx : -1, | |
816c04fe CL |
174 | (void *) skb->data, NULL, GFP_ATOMIC); |
175 | return RX_DROP_UNUSABLE; | |
f0706e82 JB |
176 | } |
177 | ||
178 | ||
e039fa4a | 179 | static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb) |
f0706e82 JB |
180 | { |
181 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
182 | struct ieee80211_key *key = tx->key; | |
e039fa4a | 183 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
d5184cac HH |
184 | unsigned int hdrlen; |
185 | int len, tail; | |
f0706e82 JB |
186 | u8 *pos; |
187 | ||
813d7669 | 188 | if (info->control.hw_key && |
ee70108f JD |
189 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) && |
190 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) { | |
813d7669 | 191 | /* hwaccel - with no need for software-generated IV */ |
23c0752a | 192 | return 0; |
e039fa4a JB |
193 | } |
194 | ||
d5184cac | 195 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 JB |
196 | len = skb->len - hdrlen; |
197 | ||
813d7669 | 198 | if (info->control.hw_key) |
23c0752a | 199 | tail = 0; |
11a843b7 | 200 | else |
23c0752a JB |
201 | tail = TKIP_ICV_LEN; |
202 | ||
203 | if (WARN_ON(skb_tailroom(skb) < tail || | |
204 | skb_headroom(skb) < TKIP_IV_LEN)) | |
205 | return -1; | |
f0706e82 JB |
206 | |
207 | pos = skb_push(skb, TKIP_IV_LEN); | |
208 | memmove(pos, pos + TKIP_IV_LEN, hdrlen); | |
7863157d | 209 | skb_set_network_header(skb, skb_network_offset(skb) + TKIP_IV_LEN); |
f0706e82 JB |
210 | pos += hdrlen; |
211 | ||
ee70108f JD |
212 | /* the HW only needs room for the IV, but not the actual IV */ |
213 | if (info->control.hw_key && | |
214 | (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) | |
215 | return 0; | |
216 | ||
f0706e82 | 217 | /* Increase IV for the frame */ |
03395003 | 218 | spin_lock(&key->u.tkip.txlock); |
b0f76b33 HH |
219 | key->u.tkip.tx.iv16++; |
220 | if (key->u.tkip.tx.iv16 == 0) | |
221 | key->u.tkip.tx.iv32++; | |
523b02ea | 222 | pos = ieee80211_tkip_add_iv(pos, key); |
03395003 | 223 | spin_unlock(&key->u.tkip.txlock); |
f0706e82 | 224 | |
813d7669 JB |
225 | /* hwaccel - with software IV */ |
226 | if (info->control.hw_key) | |
f0706e82 | 227 | return 0; |
f0706e82 JB |
228 | |
229 | /* Add room for ICV */ | |
230 | skb_put(skb, TKIP_ICV_LEN); | |
231 | ||
3473187d | 232 | return ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm, |
523b02ea | 233 | key, skb, pos, len); |
f0706e82 JB |
234 | } |
235 | ||
236 | ||
9ae54c84 | 237 | ieee80211_tx_result |
5cf121c3 | 238 | ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx) |
f0706e82 | 239 | { |
252b86c4 | 240 | struct sk_buff *skb; |
f0706e82 | 241 | |
5cf121c3 | 242 | ieee80211_tx_set_protected(tx); |
f0706e82 | 243 | |
252b86c4 | 244 | skb_queue_walk(&tx->skbs, skb) { |
2de8e0d9 JB |
245 | if (tkip_encrypt_skb(tx, skb) < 0) |
246 | return TX_DROP; | |
252b86c4 | 247 | } |
f0706e82 | 248 | |
9ae54c84 | 249 | return TX_CONTINUE; |
f0706e82 JB |
250 | } |
251 | ||
252 | ||
9ae54c84 | 253 | ieee80211_rx_result |
5cf121c3 | 254 | ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx) |
f0706e82 JB |
255 | { |
256 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; | |
747d753d | 257 | int hdrlen, res, hwaccel = 0; |
f0706e82 JB |
258 | struct ieee80211_key *key = rx->key; |
259 | struct sk_buff *skb = rx->skb; | |
eb9fb5b8 | 260 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
f0706e82 | 261 | |
d5184cac | 262 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 | 263 | |
c34498b9 | 264 | if (!ieee80211_is_data(hdr->frame_control)) |
9ae54c84 | 265 | return RX_CONTINUE; |
f0706e82 JB |
266 | |
267 | if (!rx->sta || skb->len - hdrlen < 12) | |
e4c26add | 268 | return RX_DROP_UNUSABLE; |
f0706e82 | 269 | |
a8286911 JB |
270 | /* it may be possible to optimize this a bit more */ |
271 | if (skb_linearize(rx->skb)) | |
272 | return RX_DROP_UNUSABLE; | |
273 | hdr = (void *)skb->data; | |
274 | ||
dc1580dd JB |
275 | /* |
276 | * Let TKIP code verify IV, but skip decryption. | |
277 | * In the case where hardware checks the IV as well, | |
278 | * we don't even get here, see ieee80211_rx_h_decrypt() | |
279 | */ | |
280 | if (status->flag & RX_FLAG_DECRYPTED) | |
f0706e82 | 281 | hwaccel = 1; |
f0706e82 JB |
282 | |
283 | res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm, | |
284 | key, skb->data + hdrlen, | |
17741cdc | 285 | skb->len - hdrlen, rx->sta->sta.addr, |
9e26297a | 286 | hdr->addr1, hwaccel, rx->security_idx, |
5cf121c3 JB |
287 | &rx->tkip_iv32, |
288 | &rx->tkip_iv16); | |
747d753d | 289 | if (res != TKIP_DECRYPT_OK) |
e4c26add | 290 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
291 | |
292 | /* Trim ICV */ | |
293 | skb_trim(skb, skb->len - TKIP_ICV_LEN); | |
294 | ||
295 | /* Remove IV */ | |
296 | memmove(skb->data + TKIP_IV_LEN, skb->data, hdrlen); | |
297 | skb_pull(skb, TKIP_IV_LEN); | |
298 | ||
9ae54c84 | 299 | return RX_CONTINUE; |
f0706e82 JB |
300 | } |
301 | ||
302 | ||
feccb466 | 303 | static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *scratch, |
f0706e82 JB |
304 | int encrypted) |
305 | { | |
f14df804 | 306 | __le16 mask_fc; |
fb733336 | 307 | int a4_included, mgmt; |
f14df804 | 308 | u8 qos_tid; |
feccb466 | 309 | u8 *b_0, *aad; |
f14df804 HH |
310 | u16 data_len, len_a; |
311 | unsigned int hdrlen; | |
312 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
f0706e82 | 313 | |
0cd20a27 | 314 | memset(scratch, 0, 6 * AES_BLOCK_SIZE); |
aba83a0b | 315 | |
0cd20a27 JB |
316 | b_0 = scratch + 3 * AES_BLOCK_SIZE; |
317 | aad = scratch + 4 * AES_BLOCK_SIZE; | |
feccb466 | 318 | |
f14df804 | 319 | /* |
fb733336 | 320 | * Mask FC: zero subtype b4 b5 b6 (if not mgmt) |
f14df804 HH |
321 | * Retry, PwrMgt, MoreData; set Protected |
322 | */ | |
fb733336 | 323 | mgmt = ieee80211_is_mgmt(hdr->frame_control); |
f14df804 | 324 | mask_fc = hdr->frame_control; |
fb733336 | 325 | mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | |
f14df804 | 326 | IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA); |
fb733336 JM |
327 | if (!mgmt) |
328 | mask_fc &= ~cpu_to_le16(0x0070); | |
f14df804 HH |
329 | mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); |
330 | ||
331 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
332 | len_a = hdrlen - 2; | |
333 | a4_included = ieee80211_has_a4(hdr->frame_control); | |
f0706e82 | 334 | |
f14df804 HH |
335 | if (ieee80211_is_data_qos(hdr->frame_control)) |
336 | qos_tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; | |
337 | else | |
338 | qos_tid = 0; | |
339 | ||
340 | data_len = skb->len - hdrlen - CCMP_HDR_LEN; | |
341 | if (encrypted) | |
342 | data_len -= CCMP_MIC_LEN; | |
343 | ||
344 | /* First block, b_0 */ | |
f0706e82 | 345 | b_0[0] = 0x59; /* flags: Adata: 1, M: 011, L: 001 */ |
fb733336 JM |
346 | /* Nonce: Nonce Flags | A2 | PN |
347 | * Nonce Flags: Priority (b0..b3) | Management (b4) | Reserved (b5..b7) | |
348 | */ | |
349 | b_0[1] = qos_tid | (mgmt << 4); | |
73e1f7c8 | 350 | memcpy(&b_0[2], hdr->addr2, ETH_ALEN); |
f0706e82 JB |
351 | memcpy(&b_0[8], pn, CCMP_PN_LEN); |
352 | /* l(m) */ | |
f14df804 | 353 | put_unaligned_be16(data_len, &b_0[14]); |
f0706e82 JB |
354 | |
355 | /* AAD (extra authenticate-only data) / masked 802.11 header | |
356 | * FC | A1 | A2 | A3 | SC | [A4] | [QC] */ | |
f14df804 HH |
357 | put_unaligned_be16(len_a, &aad[0]); |
358 | put_unaligned(mask_fc, (__le16 *)&aad[2]); | |
73e1f7c8 | 359 | memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN); |
f0706e82 JB |
360 | |
361 | /* Mask Seq#, leave Frag# */ | |
362 | aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f; | |
363 | aad[23] = 0; | |
f14df804 | 364 | |
f0706e82 | 365 | if (a4_included) { |
73e1f7c8 | 366 | memcpy(&aad[24], hdr->addr4, ETH_ALEN); |
f14df804 | 367 | aad[30] = qos_tid; |
f0706e82 | 368 | aad[31] = 0; |
f14df804 | 369 | } else { |
73e1f7c8 | 370 | memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN); |
f14df804 | 371 | aad[24] = qos_tid; |
f0706e82 JB |
372 | } |
373 | } | |
374 | ||
375 | ||
376 | static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn, int key_id) | |
377 | { | |
378 | hdr[0] = pn[5]; | |
379 | hdr[1] = pn[4]; | |
380 | hdr[2] = 0; | |
381 | hdr[3] = 0x20 | (key_id << 6); | |
382 | hdr[4] = pn[3]; | |
383 | hdr[5] = pn[2]; | |
384 | hdr[6] = pn[1]; | |
385 | hdr[7] = pn[0]; | |
386 | } | |
387 | ||
388 | ||
c6a1fa12 | 389 | static inline void ccmp_hdr2pn(u8 *pn, u8 *hdr) |
f0706e82 JB |
390 | { |
391 | pn[0] = hdr[7]; | |
392 | pn[1] = hdr[6]; | |
393 | pn[2] = hdr[5]; | |
394 | pn[3] = hdr[4]; | |
395 | pn[4] = hdr[1]; | |
396 | pn[5] = hdr[0]; | |
f0706e82 JB |
397 | } |
398 | ||
399 | ||
e039fa4a | 400 | static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb) |
f0706e82 JB |
401 | { |
402 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
403 | struct ieee80211_key *key = tx->key; | |
e039fa4a | 404 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
23c0752a | 405 | int hdrlen, len, tail; |
aba83a0b JB |
406 | u8 *pos; |
407 | u8 pn[6]; | |
408 | u64 pn64; | |
0cd20a27 | 409 | u8 scratch[6 * AES_BLOCK_SIZE]; |
f0706e82 | 410 | |
813d7669 | 411 | if (info->control.hw_key && |
077a9154 AN |
412 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) && |
413 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) { | |
813d7669 JB |
414 | /* |
415 | * hwaccel has no need for preallocated room for CCMP | |
416 | * header or MIC fields | |
417 | */ | |
23c0752a | 418 | return 0; |
e039fa4a JB |
419 | } |
420 | ||
d5184cac | 421 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 JB |
422 | len = skb->len - hdrlen; |
423 | ||
813d7669 | 424 | if (info->control.hw_key) |
23c0752a | 425 | tail = 0; |
11a843b7 | 426 | else |
23c0752a JB |
427 | tail = CCMP_MIC_LEN; |
428 | ||
429 | if (WARN_ON(skb_tailroom(skb) < tail || | |
430 | skb_headroom(skb) < CCMP_HDR_LEN)) | |
431 | return -1; | |
f0706e82 JB |
432 | |
433 | pos = skb_push(skb, CCMP_HDR_LEN); | |
434 | memmove(pos, pos + CCMP_HDR_LEN, hdrlen); | |
7863157d | 435 | skb_set_network_header(skb, skb_network_offset(skb) + CCMP_HDR_LEN); |
077a9154 AN |
436 | |
437 | /* the HW only needs room for the IV, but not the actual IV */ | |
e0830f71 AN |
438 | if (info->control.hw_key && |
439 | (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) | |
077a9154 AN |
440 | return 0; |
441 | ||
f0706e82 JB |
442 | hdr = (struct ieee80211_hdr *) pos; |
443 | pos += hdrlen; | |
444 | ||
aba83a0b | 445 | pn64 = atomic64_inc_return(&key->u.ccmp.tx_pn); |
f0706e82 | 446 | |
aba83a0b JB |
447 | pn[5] = pn64; |
448 | pn[4] = pn64 >> 8; | |
449 | pn[3] = pn64 >> 16; | |
450 | pn[2] = pn64 >> 24; | |
451 | pn[1] = pn64 >> 32; | |
452 | pn[0] = pn64 >> 40; | |
f0706e82 | 453 | |
8f20fc24 | 454 | ccmp_pn2hdr(pos, pn, key->conf.keyidx); |
f0706e82 | 455 | |
813d7669 JB |
456 | /* hwaccel - with software CCMP header */ |
457 | if (info->control.hw_key) | |
f0706e82 | 458 | return 0; |
f0706e82 JB |
459 | |
460 | pos += CCMP_HDR_LEN; | |
aba83a0b JB |
461 | ccmp_special_blocks(skb, pn, scratch, 0); |
462 | ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, scratch, pos, len, | |
f0706e82 JB |
463 | pos, skb_put(skb, CCMP_MIC_LEN)); |
464 | ||
465 | return 0; | |
466 | } | |
467 | ||
468 | ||
9ae54c84 | 469 | ieee80211_tx_result |
5cf121c3 | 470 | ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx) |
f0706e82 | 471 | { |
252b86c4 | 472 | struct sk_buff *skb; |
f0706e82 | 473 | |
5cf121c3 | 474 | ieee80211_tx_set_protected(tx); |
f0706e82 | 475 | |
252b86c4 | 476 | skb_queue_walk(&tx->skbs, skb) { |
2de8e0d9 JB |
477 | if (ccmp_encrypt_skb(tx, skb) < 0) |
478 | return TX_DROP; | |
252b86c4 | 479 | } |
f0706e82 | 480 | |
9ae54c84 | 481 | return TX_CONTINUE; |
f0706e82 JB |
482 | } |
483 | ||
484 | ||
9ae54c84 | 485 | ieee80211_rx_result |
5cf121c3 | 486 | ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx) |
f0706e82 | 487 | { |
c34498b9 | 488 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
f0706e82 JB |
489 | int hdrlen; |
490 | struct ieee80211_key *key = rx->key; | |
491 | struct sk_buff *skb = rx->skb; | |
eb9fb5b8 | 492 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
f0706e82 JB |
493 | u8 pn[CCMP_PN_LEN]; |
494 | int data_len; | |
9190252c | 495 | int queue; |
f0706e82 | 496 | |
d5184cac | 497 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 | 498 | |
fb733336 JM |
499 | if (!ieee80211_is_data(hdr->frame_control) && |
500 | !ieee80211_is_robust_mgmt_frame(hdr)) | |
9ae54c84 | 501 | return RX_CONTINUE; |
f0706e82 JB |
502 | |
503 | data_len = skb->len - hdrlen - CCMP_HDR_LEN - CCMP_MIC_LEN; | |
504 | if (!rx->sta || data_len < 0) | |
e4c26add | 505 | return RX_DROP_UNUSABLE; |
f0706e82 | 506 | |
a8286911 JB |
507 | if (status->flag & RX_FLAG_DECRYPTED) { |
508 | if (!pskb_may_pull(rx->skb, hdrlen + CCMP_HDR_LEN)) | |
509 | return RX_DROP_UNUSABLE; | |
510 | } else { | |
511 | if (skb_linearize(rx->skb)) | |
512 | return RX_DROP_UNUSABLE; | |
513 | } | |
514 | ||
c6a1fa12 | 515 | ccmp_hdr2pn(pn, skb->data + hdrlen); |
f0706e82 | 516 | |
9e26297a | 517 | queue = rx->security_idx; |
9190252c JM |
518 | |
519 | if (memcmp(pn, key->u.ccmp.rx_pn[queue], CCMP_PN_LEN) <= 0) { | |
f0706e82 | 520 | key->u.ccmp.replays++; |
e4c26add | 521 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
522 | } |
523 | ||
eb9fb5b8 | 524 | if (!(status->flag & RX_FLAG_DECRYPTED)) { |
0cd20a27 | 525 | u8 scratch[6 * AES_BLOCK_SIZE]; |
7848ba7d | 526 | /* hardware didn't decrypt/verify MIC */ |
aba83a0b | 527 | ccmp_special_blocks(skb, pn, scratch, 1); |
f0706e82 JB |
528 | |
529 | if (ieee80211_aes_ccm_decrypt( | |
aba83a0b | 530 | key->u.ccmp.tfm, scratch, |
f0706e82 JB |
531 | skb->data + hdrlen + CCMP_HDR_LEN, data_len, |
532 | skb->data + skb->len - CCMP_MIC_LEN, | |
c6a1fa12 | 533 | skb->data + hdrlen + CCMP_HDR_LEN)) |
e4c26add | 534 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
535 | } |
536 | ||
9190252c | 537 | memcpy(key->u.ccmp.rx_pn[queue], pn, CCMP_PN_LEN); |
f0706e82 JB |
538 | |
539 | /* Remove CCMP header and MIC */ | |
a8286911 JB |
540 | if (pskb_trim(skb, skb->len - CCMP_MIC_LEN)) |
541 | return RX_DROP_UNUSABLE; | |
f0706e82 JB |
542 | memmove(skb->data + CCMP_HDR_LEN, skb->data, hdrlen); |
543 | skb_pull(skb, CCMP_HDR_LEN); | |
544 | ||
9ae54c84 | 545 | return RX_CONTINUE; |
f0706e82 | 546 | } |
765cb46a JM |
547 | |
548 | ||
549 | static void bip_aad(struct sk_buff *skb, u8 *aad) | |
550 | { | |
33766368 JM |
551 | __le16 mask_fc; |
552 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
553 | ||
765cb46a JM |
554 | /* BIP AAD: FC(masked) || A1 || A2 || A3 */ |
555 | ||
556 | /* FC type/subtype */ | |
765cb46a | 557 | /* Mask FC Retry, PwrMgt, MoreData flags to zero */ |
33766368 JM |
558 | mask_fc = hdr->frame_control; |
559 | mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | IEEE80211_FCTL_PM | | |
560 | IEEE80211_FCTL_MOREDATA); | |
561 | put_unaligned(mask_fc, (__le16 *) &aad[0]); | |
765cb46a | 562 | /* A1 || A2 || A3 */ |
33766368 | 563 | memcpy(aad + 2, &hdr->addr1, 3 * ETH_ALEN); |
765cb46a JM |
564 | } |
565 | ||
566 | ||
75396ae6 JB |
567 | static inline void bip_ipn_set64(u8 *d, u64 pn) |
568 | { | |
569 | *d++ = pn; | |
570 | *d++ = pn >> 8; | |
571 | *d++ = pn >> 16; | |
572 | *d++ = pn >> 24; | |
573 | *d++ = pn >> 32; | |
574 | *d = pn >> 40; | |
575 | } | |
576 | ||
765cb46a JM |
577 | static inline void bip_ipn_swap(u8 *d, const u8 *s) |
578 | { | |
579 | *d++ = s[5]; | |
580 | *d++ = s[4]; | |
581 | *d++ = s[3]; | |
582 | *d++ = s[2]; | |
583 | *d++ = s[1]; | |
584 | *d = s[0]; | |
585 | } | |
586 | ||
587 | ||
588 | ieee80211_tx_result | |
589 | ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx) | |
590 | { | |
252b86c4 JB |
591 | struct sk_buff *skb; |
592 | struct ieee80211_tx_info *info; | |
765cb46a JM |
593 | struct ieee80211_key *key = tx->key; |
594 | struct ieee80211_mmie *mmie; | |
75396ae6 JB |
595 | u8 aad[20]; |
596 | u64 pn64; | |
765cb46a | 597 | |
252b86c4 JB |
598 | if (WARN_ON(skb_queue_len(&tx->skbs) != 1)) |
599 | return TX_DROP; | |
600 | ||
601 | skb = skb_peek(&tx->skbs); | |
602 | ||
603 | info = IEEE80211_SKB_CB(skb); | |
604 | ||
813d7669 | 605 | if (info->control.hw_key) |
252b86c4 | 606 | return TX_CONTINUE; |
765cb46a JM |
607 | |
608 | if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie))) | |
609 | return TX_DROP; | |
610 | ||
611 | mmie = (struct ieee80211_mmie *) skb_put(skb, sizeof(*mmie)); | |
612 | mmie->element_id = WLAN_EID_MMIE; | |
613 | mmie->length = sizeof(*mmie) - 2; | |
614 | mmie->key_id = cpu_to_le16(key->conf.keyidx); | |
615 | ||
616 | /* PN = PN + 1 */ | |
75396ae6 | 617 | pn64 = atomic64_inc_return(&key->u.aes_cmac.tx_pn); |
765cb46a | 618 | |
75396ae6 | 619 | bip_ipn_set64(mmie->sequence_number, pn64); |
765cb46a JM |
620 | |
621 | bip_aad(skb, aad); | |
622 | ||
623 | /* | |
624 | * MIC = AES-128-CMAC(IGTK, AAD || Management Frame Body || MMIE, 64) | |
625 | */ | |
75396ae6 JB |
626 | ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad, |
627 | skb->data + 24, skb->len - 24, mmie->mic); | |
765cb46a JM |
628 | |
629 | return TX_CONTINUE; | |
630 | } | |
631 | ||
632 | ||
633 | ieee80211_rx_result | |
634 | ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx) | |
635 | { | |
636 | struct sk_buff *skb = rx->skb; | |
eb9fb5b8 | 637 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
765cb46a JM |
638 | struct ieee80211_key *key = rx->key; |
639 | struct ieee80211_mmie *mmie; | |
640 | u8 aad[20], mic[8], ipn[6]; | |
641 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
642 | ||
643 | if (!ieee80211_is_mgmt(hdr->frame_control)) | |
644 | return RX_CONTINUE; | |
645 | ||
a8286911 JB |
646 | /* management frames are already linear */ |
647 | ||
765cb46a JM |
648 | if (skb->len < 24 + sizeof(*mmie)) |
649 | return RX_DROP_UNUSABLE; | |
650 | ||
651 | mmie = (struct ieee80211_mmie *) | |
652 | (skb->data + skb->len - sizeof(*mmie)); | |
653 | if (mmie->element_id != WLAN_EID_MMIE || | |
654 | mmie->length != sizeof(*mmie) - 2) | |
655 | return RX_DROP_UNUSABLE; /* Invalid MMIE */ | |
656 | ||
657 | bip_ipn_swap(ipn, mmie->sequence_number); | |
658 | ||
659 | if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) { | |
660 | key->u.aes_cmac.replays++; | |
661 | return RX_DROP_UNUSABLE; | |
662 | } | |
663 | ||
eb9fb5b8 | 664 | if (!(status->flag & RX_FLAG_DECRYPTED)) { |
765cb46a JM |
665 | /* hardware didn't decrypt/verify MIC */ |
666 | bip_aad(skb, aad); | |
75396ae6 | 667 | ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad, |
765cb46a JM |
668 | skb->data + 24, skb->len - 24, mic); |
669 | if (memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) { | |
670 | key->u.aes_cmac.icverrors++; | |
671 | return RX_DROP_UNUSABLE; | |
672 | } | |
673 | } | |
674 | ||
675 | memcpy(key->u.aes_cmac.rx_pn, ipn, 6); | |
676 | ||
677 | /* Remove MMIE */ | |
678 | skb_trim(skb, skb->len - sizeof(*mmie)); | |
679 | ||
680 | return RX_CONTINUE; | |
681 | } | |
d32a1028 YD |
682 | |
683 | ieee80211_tx_result | |
684 | ieee80211_crypto_hw_encrypt(struct ieee80211_tx_data *tx) | |
685 | { | |
686 | struct sk_buff *skb; | |
687 | struct ieee80211_tx_info *info = NULL; | |
688 | ||
689 | skb_queue_walk(&tx->skbs, skb) { | |
690 | info = IEEE80211_SKB_CB(skb); | |
691 | ||
692 | /* handle hw-only algorithm */ | |
693 | if (!info->control.hw_key) | |
694 | return TX_DROP; | |
695 | } | |
696 | ||
697 | ieee80211_tx_set_protected(tx); | |
698 | ||
699 | return TX_CONTINUE; | |
700 | } |