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Commit | Line | Data |
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f0706e82 JB |
1 | /* |
2 | * Copyright 2002-2004, Instant802 Networks, Inc. | |
765cb46a | 3 | * Copyright 2008, Jouni Malinen <j@w1.fi> |
f8079d43 | 4 | * Copyright (C) 2016 Intel Deutschland GmbH |
f0706e82 JB |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | ||
11 | #include <linux/netdevice.h> | |
12 | #include <linux/types.h> | |
f0706e82 JB |
13 | #include <linux/skbuff.h> |
14 | #include <linux/compiler.h> | |
f14df804 | 15 | #include <linux/ieee80211.h> |
5a0e3ad6 | 16 | #include <linux/gfp.h> |
f14df804 | 17 | #include <asm/unaligned.h> |
f0706e82 | 18 | #include <net/mac80211.h> |
aba83a0b | 19 | #include <crypto/aes.h> |
eb063c17 | 20 | |
f0706e82 JB |
21 | #include "ieee80211_i.h" |
22 | #include "michael.h" | |
23 | #include "tkip.h" | |
24 | #include "aes_ccm.h" | |
765cb46a | 25 | #include "aes_cmac.h" |
8ade538b | 26 | #include "aes_gmac.h" |
00b9cfa3 | 27 | #include "aes_gcm.h" |
f0706e82 JB |
28 | #include "wpa.h" |
29 | ||
9ae54c84 | 30 | ieee80211_tx_result |
5cf121c3 | 31 | ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx) |
f0706e82 | 32 | { |
747d753d | 33 | u8 *data, *key, *mic; |
f0706e82 | 34 | size_t data_len; |
8e8862b7 HH |
35 | unsigned int hdrlen; |
36 | struct ieee80211_hdr *hdr; | |
f0706e82 | 37 | struct sk_buff *skb = tx->skb; |
813d7669 | 38 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
23c0752a | 39 | int tail; |
f0706e82 | 40 | |
c34498b9 | 41 | hdr = (struct ieee80211_hdr *)skb->data; |
97359d12 JB |
42 | if (!tx->key || tx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP || |
43 | skb->len < 24 || !ieee80211_is_data_present(hdr->frame_control)) | |
9ae54c84 | 44 | return TX_CONTINUE; |
f0706e82 | 45 | |
8e8862b7 HH |
46 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
47 | if (skb->len < hdrlen) | |
9ae54c84 | 48 | return TX_DROP; |
f0706e82 | 49 | |
8e8862b7 HH |
50 | data = skb->data + hdrlen; |
51 | data_len = skb->len - hdrlen; | |
52 | ||
681d1190 JM |
53 | if (unlikely(info->flags & IEEE80211_TX_INTFL_TKIP_MIC_FAILURE)) { |
54 | /* Need to use software crypto for the test */ | |
55 | info->control.hw_key = NULL; | |
56 | } | |
57 | ||
813d7669 | 58 | if (info->control.hw_key && |
a26eb27a | 59 | (info->flags & IEEE80211_TX_CTL_DONTFRAG || |
f3fe4e93 | 60 | ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) && |
813d7669 JB |
61 | !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC)) { |
62 | /* hwaccel - with no need for SW-generated MMIC */ | |
9ae54c84 | 63 | return TX_CONTINUE; |
f0706e82 JB |
64 | } |
65 | ||
23c0752a | 66 | tail = MICHAEL_MIC_LEN; |
813d7669 | 67 | if (!info->control.hw_key) |
4325f6ca | 68 | tail += IEEE80211_TKIP_ICV_LEN; |
23c0752a | 69 | |
b1e9be87 JB |
70 | if (WARN(skb_tailroom(skb) < tail || |
71 | skb_headroom(skb) < IEEE80211_TKIP_IV_LEN, | |
72 | "mmic: not enough head/tail (%d/%d,%d/%d)\n", | |
73 | skb_headroom(skb), IEEE80211_TKIP_IV_LEN, | |
74 | skb_tailroom(skb), tail)) | |
23c0752a | 75 | return TX_DROP; |
f0706e82 | 76 | |
747d753d | 77 | key = &tx->key->conf.key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY]; |
f0706e82 | 78 | mic = skb_put(skb, MICHAEL_MIC_LEN); |
8e8862b7 | 79 | michael_mic(key, hdr, data, data_len, mic); |
681d1190 JM |
80 | if (unlikely(info->flags & IEEE80211_TX_INTFL_TKIP_MIC_FAILURE)) |
81 | mic[0]++; | |
f0706e82 | 82 | |
9ae54c84 | 83 | return TX_CONTINUE; |
f0706e82 JB |
84 | } |
85 | ||
86 | ||
9ae54c84 | 87 | ieee80211_rx_result |
5cf121c3 | 88 | ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx) |
f0706e82 | 89 | { |
747d753d | 90 | u8 *data, *key = NULL; |
f0706e82 | 91 | size_t data_len; |
8e8862b7 | 92 | unsigned int hdrlen; |
f0706e82 JB |
93 | u8 mic[MICHAEL_MIC_LEN]; |
94 | struct sk_buff *skb = rx->skb; | |
eb9fb5b8 JB |
95 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
96 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
f0706e82 | 97 | |
816c04fe CL |
98 | /* |
99 | * it makes no sense to check for MIC errors on anything other | |
100 | * than data frames. | |
101 | */ | |
102 | if (!ieee80211_is_data_present(hdr->frame_control)) | |
9ae54c84 | 103 | return RX_CONTINUE; |
f0706e82 | 104 | |
816c04fe CL |
105 | /* |
106 | * No way to verify the MIC if the hardware stripped it or | |
107 | * the IV with the key index. In this case we have solely rely | |
108 | * on the driver to set RX_FLAG_MMIC_ERROR in the event of a | |
109 | * MIC failure report. | |
110 | */ | |
111 | if (status->flag & (RX_FLAG_MMIC_STRIPPED | RX_FLAG_IV_STRIPPED)) { | |
112 | if (status->flag & RX_FLAG_MMIC_ERROR) | |
b98ea058 | 113 | goto mic_fail_no_key; |
816c04fe | 114 | |
4045f72b SG |
115 | if (!(status->flag & RX_FLAG_IV_STRIPPED) && rx->key && |
116 | rx->key->conf.cipher == WLAN_CIPHER_SUITE_TKIP) | |
816c04fe CL |
117 | goto update_iv; |
118 | ||
119 | return RX_CONTINUE; | |
120 | } | |
121 | ||
122 | /* | |
123 | * Some hardware seems to generate Michael MIC failure reports; even | |
124 | * though, the frame was not encrypted with TKIP and therefore has no | |
125 | * MIC. Ignore the flag them to avoid triggering countermeasures. | |
126 | */ | |
97359d12 | 127 | if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP || |
816c04fe | 128 | !(status->flag & RX_FLAG_DECRYPTED)) |
9ae54c84 | 129 | return RX_CONTINUE; |
f0706e82 | 130 | |
816c04fe CL |
131 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP && rx->key->conf.keyidx) { |
132 | /* | |
133 | * APs with pairwise keys should never receive Michael MIC | |
134 | * errors for non-zero keyidx because these are reserved for | |
135 | * group keys and only the AP is sending real multicast | |
87ee475e | 136 | * frames in the BSS. |
816c04fe CL |
137 | */ |
138 | return RX_DROP_UNUSABLE; | |
139 | } | |
140 | ||
141 | if (status->flag & RX_FLAG_MMIC_ERROR) | |
142 | goto mic_fail; | |
143 | ||
8e8862b7 HH |
144 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
145 | if (skb->len < hdrlen + MICHAEL_MIC_LEN) | |
e4c26add | 146 | return RX_DROP_UNUSABLE; |
f0706e82 | 147 | |
a8286911 JB |
148 | if (skb_linearize(rx->skb)) |
149 | return RX_DROP_UNUSABLE; | |
150 | hdr = (void *)skb->data; | |
151 | ||
8e8862b7 HH |
152 | data = skb->data + hdrlen; |
153 | data_len = skb->len - hdrlen - MICHAEL_MIC_LEN; | |
747d753d | 154 | key = &rx->key->conf.key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY]; |
8e8862b7 | 155 | michael_mic(key, hdr, data, data_len, mic); |
816c04fe CL |
156 | if (memcmp(mic, data + data_len, MICHAEL_MIC_LEN) != 0) |
157 | goto mic_fail; | |
f0706e82 | 158 | |
f0706e82 JB |
159 | /* remove Michael MIC from payload */ |
160 | skb_trim(skb, skb->len - MICHAEL_MIC_LEN); | |
161 | ||
816c04fe | 162 | update_iv: |
50741ae0 | 163 | /* update IV in key information to be able to detect replays */ |
9e26297a JB |
164 | rx->key->u.tkip.rx[rx->security_idx].iv32 = rx->tkip_iv32; |
165 | rx->key->u.tkip.rx[rx->security_idx].iv16 = rx->tkip_iv16; | |
50741ae0 | 166 | |
9ae54c84 | 167 | return RX_CONTINUE; |
816c04fe CL |
168 | |
169 | mic_fail: | |
b98ea058 S |
170 | rx->key->u.tkip.mic_failures++; |
171 | ||
172 | mic_fail_no_key: | |
a66b98db AN |
173 | /* |
174 | * In some cases the key can be unset - e.g. a multicast packet, in | |
175 | * a driver that supports HW encryption. Send up the key idx only if | |
176 | * the key is set. | |
177 | */ | |
6f1f5d5f JB |
178 | cfg80211_michael_mic_failure(rx->sdata->dev, hdr->addr2, |
179 | is_multicast_ether_addr(hdr->addr1) ? | |
180 | NL80211_KEYTYPE_GROUP : | |
181 | NL80211_KEYTYPE_PAIRWISE, | |
182 | rx->key ? rx->key->conf.keyidx : -1, | |
183 | NULL, GFP_ATOMIC); | |
816c04fe | 184 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
185 | } |
186 | ||
e039fa4a | 187 | static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb) |
f0706e82 JB |
188 | { |
189 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
190 | struct ieee80211_key *key = tx->key; | |
e039fa4a | 191 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
d5184cac HH |
192 | unsigned int hdrlen; |
193 | int len, tail; | |
f8079d43 | 194 | u64 pn; |
f0706e82 JB |
195 | u8 *pos; |
196 | ||
813d7669 | 197 | if (info->control.hw_key && |
ee70108f JD |
198 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) && |
199 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) { | |
813d7669 | 200 | /* hwaccel - with no need for software-generated IV */ |
23c0752a | 201 | return 0; |
e039fa4a JB |
202 | } |
203 | ||
d5184cac | 204 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 JB |
205 | len = skb->len - hdrlen; |
206 | ||
813d7669 | 207 | if (info->control.hw_key) |
23c0752a | 208 | tail = 0; |
11a843b7 | 209 | else |
4325f6ca | 210 | tail = IEEE80211_TKIP_ICV_LEN; |
23c0752a JB |
211 | |
212 | if (WARN_ON(skb_tailroom(skb) < tail || | |
4325f6ca | 213 | skb_headroom(skb) < IEEE80211_TKIP_IV_LEN)) |
23c0752a | 214 | return -1; |
f0706e82 | 215 | |
4325f6ca JB |
216 | pos = skb_push(skb, IEEE80211_TKIP_IV_LEN); |
217 | memmove(pos, pos + IEEE80211_TKIP_IV_LEN, hdrlen); | |
f0706e82 JB |
218 | pos += hdrlen; |
219 | ||
ee70108f JD |
220 | /* the HW only needs room for the IV, but not the actual IV */ |
221 | if (info->control.hw_key && | |
222 | (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) | |
223 | return 0; | |
224 | ||
f0706e82 | 225 | /* Increase IV for the frame */ |
f8079d43 EP |
226 | pn = atomic64_inc_return(&key->conf.tx_pn); |
227 | pos = ieee80211_tkip_add_iv(pos, &key->conf, pn); | |
f0706e82 | 228 | |
813d7669 JB |
229 | /* hwaccel - with software IV */ |
230 | if (info->control.hw_key) | |
f0706e82 | 231 | return 0; |
f0706e82 JB |
232 | |
233 | /* Add room for ICV */ | |
4325f6ca | 234 | skb_put(skb, IEEE80211_TKIP_ICV_LEN); |
f0706e82 | 235 | |
3473187d | 236 | return ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm, |
523b02ea | 237 | key, skb, pos, len); |
f0706e82 JB |
238 | } |
239 | ||
240 | ||
9ae54c84 | 241 | ieee80211_tx_result |
5cf121c3 | 242 | ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx) |
f0706e82 | 243 | { |
252b86c4 | 244 | struct sk_buff *skb; |
f0706e82 | 245 | |
5cf121c3 | 246 | ieee80211_tx_set_protected(tx); |
f0706e82 | 247 | |
252b86c4 | 248 | skb_queue_walk(&tx->skbs, skb) { |
2de8e0d9 JB |
249 | if (tkip_encrypt_skb(tx, skb) < 0) |
250 | return TX_DROP; | |
252b86c4 | 251 | } |
f0706e82 | 252 | |
9ae54c84 | 253 | return TX_CONTINUE; |
f0706e82 JB |
254 | } |
255 | ||
256 | ||
9ae54c84 | 257 | ieee80211_rx_result |
5cf121c3 | 258 | ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx) |
f0706e82 JB |
259 | { |
260 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; | |
747d753d | 261 | int hdrlen, res, hwaccel = 0; |
f0706e82 JB |
262 | struct ieee80211_key *key = rx->key; |
263 | struct sk_buff *skb = rx->skb; | |
eb9fb5b8 | 264 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
f0706e82 | 265 | |
d5184cac | 266 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 | 267 | |
c34498b9 | 268 | if (!ieee80211_is_data(hdr->frame_control)) |
9ae54c84 | 269 | return RX_CONTINUE; |
f0706e82 JB |
270 | |
271 | if (!rx->sta || skb->len - hdrlen < 12) | |
e4c26add | 272 | return RX_DROP_UNUSABLE; |
f0706e82 | 273 | |
a8286911 JB |
274 | /* it may be possible to optimize this a bit more */ |
275 | if (skb_linearize(rx->skb)) | |
276 | return RX_DROP_UNUSABLE; | |
277 | hdr = (void *)skb->data; | |
278 | ||
dc1580dd JB |
279 | /* |
280 | * Let TKIP code verify IV, but skip decryption. | |
281 | * In the case where hardware checks the IV as well, | |
282 | * we don't even get here, see ieee80211_rx_h_decrypt() | |
283 | */ | |
284 | if (status->flag & RX_FLAG_DECRYPTED) | |
f0706e82 | 285 | hwaccel = 1; |
f0706e82 JB |
286 | |
287 | res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm, | |
288 | key, skb->data + hdrlen, | |
17741cdc | 289 | skb->len - hdrlen, rx->sta->sta.addr, |
9e26297a | 290 | hdr->addr1, hwaccel, rx->security_idx, |
5cf121c3 JB |
291 | &rx->tkip_iv32, |
292 | &rx->tkip_iv16); | |
747d753d | 293 | if (res != TKIP_DECRYPT_OK) |
e4c26add | 294 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
295 | |
296 | /* Trim ICV */ | |
4325f6ca | 297 | skb_trim(skb, skb->len - IEEE80211_TKIP_ICV_LEN); |
f0706e82 JB |
298 | |
299 | /* Remove IV */ | |
4325f6ca JB |
300 | memmove(skb->data + IEEE80211_TKIP_IV_LEN, skb->data, hdrlen); |
301 | skb_pull(skb, IEEE80211_TKIP_IV_LEN); | |
f0706e82 | 302 | |
9ae54c84 | 303 | return RX_CONTINUE; |
f0706e82 JB |
304 | } |
305 | ||
306 | ||
30ef7ef9 | 307 | static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad) |
f0706e82 | 308 | { |
f14df804 | 309 | __le16 mask_fc; |
fb733336 | 310 | int a4_included, mgmt; |
f14df804 | 311 | u8 qos_tid; |
7ec7c4a9 | 312 | u16 len_a; |
f14df804 HH |
313 | unsigned int hdrlen; |
314 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
f0706e82 | 315 | |
f14df804 | 316 | /* |
fb733336 | 317 | * Mask FC: zero subtype b4 b5 b6 (if not mgmt) |
f14df804 HH |
318 | * Retry, PwrMgt, MoreData; set Protected |
319 | */ | |
fb733336 | 320 | mgmt = ieee80211_is_mgmt(hdr->frame_control); |
f14df804 | 321 | mask_fc = hdr->frame_control; |
fb733336 | 322 | mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | |
f14df804 | 323 | IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA); |
fb733336 JM |
324 | if (!mgmt) |
325 | mask_fc &= ~cpu_to_le16(0x0070); | |
f14df804 HH |
326 | mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); |
327 | ||
328 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
329 | len_a = hdrlen - 2; | |
330 | a4_included = ieee80211_has_a4(hdr->frame_control); | |
f0706e82 | 331 | |
f14df804 HH |
332 | if (ieee80211_is_data_qos(hdr->frame_control)) |
333 | qos_tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; | |
334 | else | |
335 | qos_tid = 0; | |
336 | ||
7ec7c4a9 AB |
337 | /* In CCM, the initial vectors (IV) used for CTR mode encryption and CBC |
338 | * mode authentication are not allowed to collide, yet both are derived | |
339 | * from this vector b_0. We only set L := 1 here to indicate that the | |
340 | * data size can be represented in (L+1) bytes. The CCM layer will take | |
341 | * care of storing the data length in the top (L+1) bytes and setting | |
342 | * and clearing the other bits as is required to derive the two IVs. | |
343 | */ | |
344 | b_0[0] = 0x1; | |
f14df804 | 345 | |
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); |
4325f6ca | 351 | memcpy(&b_0[8], pn, IEEE80211_CCMP_PN_LEN); |
f0706e82 JB |
352 | |
353 | /* AAD (extra authenticate-only data) / masked 802.11 header | |
354 | * FC | A1 | A2 | A3 | SC | [A4] | [QC] */ | |
f14df804 HH |
355 | put_unaligned_be16(len_a, &aad[0]); |
356 | put_unaligned(mask_fc, (__le16 *)&aad[2]); | |
73e1f7c8 | 357 | memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN); |
f0706e82 JB |
358 | |
359 | /* Mask Seq#, leave Frag# */ | |
360 | aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f; | |
361 | aad[23] = 0; | |
f14df804 | 362 | |
f0706e82 | 363 | if (a4_included) { |
73e1f7c8 | 364 | memcpy(&aad[24], hdr->addr4, ETH_ALEN); |
f14df804 | 365 | aad[30] = qos_tid; |
f0706e82 | 366 | aad[31] = 0; |
f14df804 | 367 | } else { |
73e1f7c8 | 368 | memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN); |
f14df804 | 369 | aad[24] = qos_tid; |
f0706e82 JB |
370 | } |
371 | } | |
372 | ||
373 | ||
374 | static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn, int key_id) | |
375 | { | |
376 | hdr[0] = pn[5]; | |
377 | hdr[1] = pn[4]; | |
378 | hdr[2] = 0; | |
379 | hdr[3] = 0x20 | (key_id << 6); | |
380 | hdr[4] = pn[3]; | |
381 | hdr[5] = pn[2]; | |
382 | hdr[6] = pn[1]; | |
383 | hdr[7] = pn[0]; | |
384 | } | |
385 | ||
386 | ||
c6a1fa12 | 387 | static inline void ccmp_hdr2pn(u8 *pn, u8 *hdr) |
f0706e82 JB |
388 | { |
389 | pn[0] = hdr[7]; | |
390 | pn[1] = hdr[6]; | |
391 | pn[2] = hdr[5]; | |
392 | pn[3] = hdr[4]; | |
393 | pn[4] = hdr[1]; | |
394 | pn[5] = hdr[0]; | |
f0706e82 JB |
395 | } |
396 | ||
397 | ||
2b2ba0db JM |
398 | static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb, |
399 | unsigned int mic_len) | |
f0706e82 JB |
400 | { |
401 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
402 | struct ieee80211_key *key = tx->key; | |
e039fa4a | 403 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
23c0752a | 404 | int hdrlen, len, tail; |
aba83a0b JB |
405 | u8 *pos; |
406 | u8 pn[6]; | |
407 | u64 pn64; | |
f4a067f9 | 408 | u8 aad[CCM_AAD_LEN]; |
7ec7c4a9 | 409 | u8 b_0[AES_BLOCK_SIZE]; |
f0706e82 | 410 | |
813d7669 | 411 | if (info->control.hw_key && |
077a9154 | 412 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) && |
17d38fa8 MK |
413 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) && |
414 | !((info->control.hw_key->flags & | |
415 | IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) && | |
416 | ieee80211_is_mgmt(hdr->frame_control))) { | |
813d7669 JB |
417 | /* |
418 | * hwaccel has no need for preallocated room for CCMP | |
419 | * header or MIC fields | |
420 | */ | |
23c0752a | 421 | return 0; |
e039fa4a JB |
422 | } |
423 | ||
d5184cac | 424 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 JB |
425 | len = skb->len - hdrlen; |
426 | ||
813d7669 | 427 | if (info->control.hw_key) |
23c0752a | 428 | tail = 0; |
11a843b7 | 429 | else |
2b2ba0db | 430 | tail = mic_len; |
23c0752a JB |
431 | |
432 | if (WARN_ON(skb_tailroom(skb) < tail || | |
4325f6ca | 433 | skb_headroom(skb) < IEEE80211_CCMP_HDR_LEN)) |
23c0752a | 434 | return -1; |
f0706e82 | 435 | |
4325f6ca JB |
436 | pos = skb_push(skb, IEEE80211_CCMP_HDR_LEN); |
437 | memmove(pos, pos + IEEE80211_CCMP_HDR_LEN, hdrlen); | |
077a9154 AN |
438 | |
439 | /* the HW only needs room for the IV, but not the actual IV */ | |
e0830f71 AN |
440 | if (info->control.hw_key && |
441 | (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) | |
077a9154 AN |
442 | return 0; |
443 | ||
f0706e82 JB |
444 | hdr = (struct ieee80211_hdr *) pos; |
445 | pos += hdrlen; | |
446 | ||
db388a56 | 447 | pn64 = atomic64_inc_return(&key->conf.tx_pn); |
f0706e82 | 448 | |
aba83a0b JB |
449 | pn[5] = pn64; |
450 | pn[4] = pn64 >> 8; | |
451 | pn[3] = pn64 >> 16; | |
452 | pn[2] = pn64 >> 24; | |
453 | pn[1] = pn64 >> 32; | |
454 | pn[0] = pn64 >> 40; | |
f0706e82 | 455 | |
8f20fc24 | 456 | ccmp_pn2hdr(pos, pn, key->conf.keyidx); |
f0706e82 | 457 | |
813d7669 JB |
458 | /* hwaccel - with software CCMP header */ |
459 | if (info->control.hw_key) | |
f0706e82 | 460 | return 0; |
f0706e82 | 461 | |
4325f6ca | 462 | pos += IEEE80211_CCMP_HDR_LEN; |
30ef7ef9 | 463 | ccmp_special_blocks(skb, pn, b_0, aad); |
f4a067f9 AB |
464 | return ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, b_0, aad, pos, len, |
465 | skb_put(skb, mic_len), mic_len); | |
f0706e82 JB |
466 | } |
467 | ||
468 | ||
9ae54c84 | 469 | ieee80211_tx_result |
2b2ba0db JM |
470 | ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx, |
471 | unsigned int mic_len) | |
f0706e82 | 472 | { |
252b86c4 | 473 | struct sk_buff *skb; |
f0706e82 | 474 | |
5cf121c3 | 475 | ieee80211_tx_set_protected(tx); |
f0706e82 | 476 | |
252b86c4 | 477 | skb_queue_walk(&tx->skbs, skb) { |
2b2ba0db | 478 | if (ccmp_encrypt_skb(tx, skb, mic_len) < 0) |
2de8e0d9 | 479 | return TX_DROP; |
252b86c4 | 480 | } |
f0706e82 | 481 | |
9ae54c84 | 482 | return TX_CONTINUE; |
f0706e82 JB |
483 | } |
484 | ||
485 | ||
9ae54c84 | 486 | ieee80211_rx_result |
2b2ba0db JM |
487 | ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx, |
488 | unsigned int mic_len) | |
f0706e82 | 489 | { |
c34498b9 | 490 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
f0706e82 JB |
491 | int hdrlen; |
492 | struct ieee80211_key *key = rx->key; | |
493 | struct sk_buff *skb = rx->skb; | |
eb9fb5b8 | 494 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
4325f6ca | 495 | u8 pn[IEEE80211_CCMP_PN_LEN]; |
f0706e82 | 496 | int data_len; |
9190252c | 497 | int queue; |
f0706e82 | 498 | |
d5184cac | 499 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 | 500 | |
fb733336 | 501 | if (!ieee80211_is_data(hdr->frame_control) && |
d8ca16db | 502 | !ieee80211_is_robust_mgmt_frame(skb)) |
9ae54c84 | 503 | return RX_CONTINUE; |
f0706e82 | 504 | |
a8286911 | 505 | if (status->flag & RX_FLAG_DECRYPTED) { |
4325f6ca | 506 | if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_CCMP_HDR_LEN)) |
a8286911 | 507 | return RX_DROP_UNUSABLE; |
f980ebc0 SS |
508 | if (status->flag & RX_FLAG_MIC_STRIPPED) |
509 | mic_len = 0; | |
a8286911 JB |
510 | } else { |
511 | if (skb_linearize(rx->skb)) | |
512 | return RX_DROP_UNUSABLE; | |
513 | } | |
514 | ||
f980ebc0 SS |
515 | data_len = skb->len - hdrlen - IEEE80211_CCMP_HDR_LEN - mic_len; |
516 | if (!rx->sta || data_len < 0) | |
517 | return RX_DROP_UNUSABLE; | |
518 | ||
981d94a8 | 519 | if (!(status->flag & RX_FLAG_PN_VALIDATED)) { |
f631a77b SS |
520 | int res; |
521 | ||
981d94a8 | 522 | ccmp_hdr2pn(pn, skb->data + hdrlen); |
f0706e82 | 523 | |
981d94a8 | 524 | queue = rx->security_idx; |
9190252c | 525 | |
f631a77b SS |
526 | res = memcmp(pn, key->u.ccmp.rx_pn[queue], |
527 | IEEE80211_CCMP_PN_LEN); | |
528 | if (res < 0 || | |
529 | (!res && !(status->flag & RX_FLAG_ALLOW_SAME_PN))) { | |
981d94a8 | 530 | key->u.ccmp.replays++; |
e4c26add | 531 | return RX_DROP_UNUSABLE; |
981d94a8 JB |
532 | } |
533 | ||
534 | if (!(status->flag & RX_FLAG_DECRYPTED)) { | |
535 | u8 aad[2 * AES_BLOCK_SIZE]; | |
536 | u8 b_0[AES_BLOCK_SIZE]; | |
537 | /* hardware didn't decrypt/verify MIC */ | |
538 | ccmp_special_blocks(skb, pn, b_0, aad); | |
539 | ||
540 | if (ieee80211_aes_ccm_decrypt( | |
541 | key->u.ccmp.tfm, b_0, aad, | |
542 | skb->data + hdrlen + IEEE80211_CCMP_HDR_LEN, | |
543 | data_len, | |
544 | skb->data + skb->len - mic_len, mic_len)) | |
545 | return RX_DROP_UNUSABLE; | |
546 | } | |
547 | ||
548 | memcpy(key->u.ccmp.rx_pn[queue], pn, IEEE80211_CCMP_PN_LEN); | |
f0706e82 JB |
549 | } |
550 | ||
f0706e82 | 551 | /* Remove CCMP header and MIC */ |
2b2ba0db | 552 | if (pskb_trim(skb, skb->len - mic_len)) |
a8286911 | 553 | return RX_DROP_UNUSABLE; |
4325f6ca JB |
554 | memmove(skb->data + IEEE80211_CCMP_HDR_LEN, skb->data, hdrlen); |
555 | skb_pull(skb, IEEE80211_CCMP_HDR_LEN); | |
f0706e82 | 556 | |
9ae54c84 | 557 | return RX_CONTINUE; |
f0706e82 | 558 | } |
765cb46a | 559 | |
00b9cfa3 JM |
560 | static void gcmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *j_0, u8 *aad) |
561 | { | |
562 | __le16 mask_fc; | |
563 | u8 qos_tid; | |
564 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
565 | ||
566 | memcpy(j_0, hdr->addr2, ETH_ALEN); | |
567 | memcpy(&j_0[ETH_ALEN], pn, IEEE80211_GCMP_PN_LEN); | |
568 | j_0[13] = 0; | |
569 | j_0[14] = 0; | |
570 | j_0[AES_BLOCK_SIZE - 1] = 0x01; | |
571 | ||
572 | /* AAD (extra authenticate-only data) / masked 802.11 header | |
573 | * FC | A1 | A2 | A3 | SC | [A4] | [QC] | |
574 | */ | |
575 | put_unaligned_be16(ieee80211_hdrlen(hdr->frame_control) - 2, &aad[0]); | |
576 | /* Mask FC: zero subtype b4 b5 b6 (if not mgmt) | |
577 | * Retry, PwrMgt, MoreData; set Protected | |
578 | */ | |
579 | mask_fc = hdr->frame_control; | |
580 | mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | | |
581 | IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA); | |
582 | if (!ieee80211_is_mgmt(hdr->frame_control)) | |
583 | mask_fc &= ~cpu_to_le16(0x0070); | |
584 | mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); | |
585 | ||
586 | put_unaligned(mask_fc, (__le16 *)&aad[2]); | |
587 | memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN); | |
588 | ||
589 | /* Mask Seq#, leave Frag# */ | |
590 | aad[22] = *((u8 *)&hdr->seq_ctrl) & 0x0f; | |
591 | aad[23] = 0; | |
592 | ||
593 | if (ieee80211_is_data_qos(hdr->frame_control)) | |
594 | qos_tid = *ieee80211_get_qos_ctl(hdr) & | |
595 | IEEE80211_QOS_CTL_TID_MASK; | |
596 | else | |
597 | qos_tid = 0; | |
598 | ||
599 | if (ieee80211_has_a4(hdr->frame_control)) { | |
600 | memcpy(&aad[24], hdr->addr4, ETH_ALEN); | |
601 | aad[30] = qos_tid; | |
602 | aad[31] = 0; | |
603 | } else { | |
604 | memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN); | |
605 | aad[24] = qos_tid; | |
606 | } | |
607 | } | |
608 | ||
609 | static inline void gcmp_pn2hdr(u8 *hdr, const u8 *pn, int key_id) | |
610 | { | |
611 | hdr[0] = pn[5]; | |
612 | hdr[1] = pn[4]; | |
613 | hdr[2] = 0; | |
614 | hdr[3] = 0x20 | (key_id << 6); | |
615 | hdr[4] = pn[3]; | |
616 | hdr[5] = pn[2]; | |
617 | hdr[6] = pn[1]; | |
618 | hdr[7] = pn[0]; | |
619 | } | |
620 | ||
621 | static inline void gcmp_hdr2pn(u8 *pn, const u8 *hdr) | |
622 | { | |
623 | pn[0] = hdr[7]; | |
624 | pn[1] = hdr[6]; | |
625 | pn[2] = hdr[5]; | |
626 | pn[3] = hdr[4]; | |
627 | pn[4] = hdr[1]; | |
628 | pn[5] = hdr[0]; | |
629 | } | |
630 | ||
631 | static int gcmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb) | |
632 | { | |
633 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
634 | struct ieee80211_key *key = tx->key; | |
635 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
636 | int hdrlen, len, tail; | |
637 | u8 *pos; | |
638 | u8 pn[6]; | |
639 | u64 pn64; | |
f4a067f9 | 640 | u8 aad[GCM_AAD_LEN]; |
00b9cfa3 JM |
641 | u8 j_0[AES_BLOCK_SIZE]; |
642 | ||
643 | if (info->control.hw_key && | |
644 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) && | |
645 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) && | |
646 | !((info->control.hw_key->flags & | |
647 | IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) && | |
648 | ieee80211_is_mgmt(hdr->frame_control))) { | |
649 | /* hwaccel has no need for preallocated room for GCMP | |
650 | * header or MIC fields | |
651 | */ | |
652 | return 0; | |
653 | } | |
654 | ||
655 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
656 | len = skb->len - hdrlen; | |
657 | ||
658 | if (info->control.hw_key) | |
659 | tail = 0; | |
660 | else | |
661 | tail = IEEE80211_GCMP_MIC_LEN; | |
662 | ||
663 | if (WARN_ON(skb_tailroom(skb) < tail || | |
664 | skb_headroom(skb) < IEEE80211_GCMP_HDR_LEN)) | |
665 | return -1; | |
666 | ||
667 | pos = skb_push(skb, IEEE80211_GCMP_HDR_LEN); | |
668 | memmove(pos, pos + IEEE80211_GCMP_HDR_LEN, hdrlen); | |
669 | skb_set_network_header(skb, skb_network_offset(skb) + | |
670 | IEEE80211_GCMP_HDR_LEN); | |
671 | ||
672 | /* the HW only needs room for the IV, but not the actual IV */ | |
673 | if (info->control.hw_key && | |
674 | (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) | |
675 | return 0; | |
676 | ||
677 | hdr = (struct ieee80211_hdr *)pos; | |
678 | pos += hdrlen; | |
679 | ||
db388a56 | 680 | pn64 = atomic64_inc_return(&key->conf.tx_pn); |
00b9cfa3 JM |
681 | |
682 | pn[5] = pn64; | |
683 | pn[4] = pn64 >> 8; | |
684 | pn[3] = pn64 >> 16; | |
685 | pn[2] = pn64 >> 24; | |
686 | pn[1] = pn64 >> 32; | |
687 | pn[0] = pn64 >> 40; | |
688 | ||
689 | gcmp_pn2hdr(pos, pn, key->conf.keyidx); | |
690 | ||
691 | /* hwaccel - with software GCMP header */ | |
692 | if (info->control.hw_key) | |
693 | return 0; | |
694 | ||
695 | pos += IEEE80211_GCMP_HDR_LEN; | |
696 | gcmp_special_blocks(skb, pn, j_0, aad); | |
f4a067f9 AB |
697 | return ieee80211_aes_gcm_encrypt(key->u.gcmp.tfm, j_0, aad, pos, len, |
698 | skb_put(skb, IEEE80211_GCMP_MIC_LEN)); | |
00b9cfa3 JM |
699 | } |
700 | ||
701 | ieee80211_tx_result | |
702 | ieee80211_crypto_gcmp_encrypt(struct ieee80211_tx_data *tx) | |
703 | { | |
704 | struct sk_buff *skb; | |
705 | ||
706 | ieee80211_tx_set_protected(tx); | |
707 | ||
708 | skb_queue_walk(&tx->skbs, skb) { | |
709 | if (gcmp_encrypt_skb(tx, skb) < 0) | |
710 | return TX_DROP; | |
711 | } | |
712 | ||
713 | return TX_CONTINUE; | |
714 | } | |
715 | ||
716 | ieee80211_rx_result | |
717 | ieee80211_crypto_gcmp_decrypt(struct ieee80211_rx_data *rx) | |
718 | { | |
719 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; | |
720 | int hdrlen; | |
721 | struct ieee80211_key *key = rx->key; | |
722 | struct sk_buff *skb = rx->skb; | |
723 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
724 | u8 pn[IEEE80211_GCMP_PN_LEN]; | |
f980ebc0 | 725 | int data_len, queue, mic_len = IEEE80211_GCMP_MIC_LEN; |
00b9cfa3 JM |
726 | |
727 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
728 | ||
729 | if (!ieee80211_is_data(hdr->frame_control) && | |
730 | !ieee80211_is_robust_mgmt_frame(skb)) | |
731 | return RX_CONTINUE; | |
732 | ||
00b9cfa3 JM |
733 | if (status->flag & RX_FLAG_DECRYPTED) { |
734 | if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_GCMP_HDR_LEN)) | |
735 | return RX_DROP_UNUSABLE; | |
f980ebc0 SS |
736 | if (status->flag & RX_FLAG_MIC_STRIPPED) |
737 | mic_len = 0; | |
00b9cfa3 JM |
738 | } else { |
739 | if (skb_linearize(rx->skb)) | |
740 | return RX_DROP_UNUSABLE; | |
741 | } | |
742 | ||
f980ebc0 SS |
743 | data_len = skb->len - hdrlen - IEEE80211_GCMP_HDR_LEN - mic_len; |
744 | if (!rx->sta || data_len < 0) | |
745 | return RX_DROP_UNUSABLE; | |
746 | ||
981d94a8 | 747 | if (!(status->flag & RX_FLAG_PN_VALIDATED)) { |
f631a77b SS |
748 | int res; |
749 | ||
981d94a8 | 750 | gcmp_hdr2pn(pn, skb->data + hdrlen); |
00b9cfa3 | 751 | |
981d94a8 | 752 | queue = rx->security_idx; |
00b9cfa3 | 753 | |
f631a77b SS |
754 | res = memcmp(pn, key->u.gcmp.rx_pn[queue], |
755 | IEEE80211_GCMP_PN_LEN); | |
756 | if (res < 0 || | |
757 | (!res && !(status->flag & RX_FLAG_ALLOW_SAME_PN))) { | |
981d94a8 | 758 | key->u.gcmp.replays++; |
00b9cfa3 | 759 | return RX_DROP_UNUSABLE; |
981d94a8 JB |
760 | } |
761 | ||
762 | if (!(status->flag & RX_FLAG_DECRYPTED)) { | |
763 | u8 aad[2 * AES_BLOCK_SIZE]; | |
764 | u8 j_0[AES_BLOCK_SIZE]; | |
765 | /* hardware didn't decrypt/verify MIC */ | |
766 | gcmp_special_blocks(skb, pn, j_0, aad); | |
767 | ||
768 | if (ieee80211_aes_gcm_decrypt( | |
769 | key->u.gcmp.tfm, j_0, aad, | |
770 | skb->data + hdrlen + IEEE80211_GCMP_HDR_LEN, | |
771 | data_len, | |
772 | skb->data + skb->len - | |
773 | IEEE80211_GCMP_MIC_LEN)) | |
774 | return RX_DROP_UNUSABLE; | |
775 | } | |
776 | ||
777 | memcpy(key->u.gcmp.rx_pn[queue], pn, IEEE80211_GCMP_PN_LEN); | |
00b9cfa3 JM |
778 | } |
779 | ||
00b9cfa3 | 780 | /* Remove GCMP header and MIC */ |
f980ebc0 | 781 | if (pskb_trim(skb, skb->len - mic_len)) |
00b9cfa3 JM |
782 | return RX_DROP_UNUSABLE; |
783 | memmove(skb->data + IEEE80211_GCMP_HDR_LEN, skb->data, hdrlen); | |
784 | skb_pull(skb, IEEE80211_GCMP_HDR_LEN); | |
785 | ||
786 | return RX_CONTINUE; | |
787 | } | |
788 | ||
2475b1cc MS |
789 | static ieee80211_tx_result |
790 | ieee80211_crypto_cs_encrypt(struct ieee80211_tx_data *tx, | |
791 | struct sk_buff *skb) | |
792 | { | |
793 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
794 | struct ieee80211_key *key = tx->key; | |
795 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
2475b1cc | 796 | int hdrlen; |
c7ef38e0 | 797 | u8 *pos, iv_len = key->conf.iv_len; |
2475b1cc MS |
798 | |
799 | if (info->control.hw_key && | |
800 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) { | |
801 | /* hwaccel has no need for preallocated head room */ | |
802 | return TX_CONTINUE; | |
803 | } | |
804 | ||
c7ef38e0 CI |
805 | if (unlikely(skb_headroom(skb) < iv_len && |
806 | pskb_expand_head(skb, iv_len, 0, GFP_ATOMIC))) | |
2475b1cc MS |
807 | return TX_DROP; |
808 | ||
809 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
810 | ||
c7ef38e0 CI |
811 | pos = skb_push(skb, iv_len); |
812 | memmove(pos, pos + iv_len, hdrlen); | |
2475b1cc MS |
813 | |
814 | return TX_CONTINUE; | |
815 | } | |
816 | ||
817 | static inline int ieee80211_crypto_cs_pn_compare(u8 *pn1, u8 *pn2, int len) | |
818 | { | |
819 | int i; | |
820 | ||
821 | /* pn is little endian */ | |
822 | for (i = len - 1; i >= 0; i--) { | |
823 | if (pn1[i] < pn2[i]) | |
824 | return -1; | |
825 | else if (pn1[i] > pn2[i]) | |
826 | return 1; | |
827 | } | |
828 | ||
829 | return 0; | |
830 | } | |
831 | ||
832 | static ieee80211_rx_result | |
833 | ieee80211_crypto_cs_decrypt(struct ieee80211_rx_data *rx) | |
834 | { | |
835 | struct ieee80211_key *key = rx->key; | |
836 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; | |
837 | const struct ieee80211_cipher_scheme *cs = NULL; | |
838 | int hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
839 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); | |
840 | int data_len; | |
841 | u8 *rx_pn; | |
842 | u8 *skb_pn; | |
843 | u8 qos_tid; | |
844 | ||
845 | if (!rx->sta || !rx->sta->cipher_scheme || | |
846 | !(status->flag & RX_FLAG_DECRYPTED)) | |
847 | return RX_DROP_UNUSABLE; | |
848 | ||
849 | if (!ieee80211_is_data(hdr->frame_control)) | |
850 | return RX_CONTINUE; | |
851 | ||
852 | cs = rx->sta->cipher_scheme; | |
853 | ||
854 | data_len = rx->skb->len - hdrlen - cs->hdr_len; | |
855 | ||
856 | if (data_len < 0) | |
857 | return RX_DROP_UNUSABLE; | |
858 | ||
859 | if (ieee80211_is_data_qos(hdr->frame_control)) | |
860 | qos_tid = *ieee80211_get_qos_ctl(hdr) & | |
861 | IEEE80211_QOS_CTL_TID_MASK; | |
862 | else | |
863 | qos_tid = 0; | |
864 | ||
865 | if (skb_linearize(rx->skb)) | |
866 | return RX_DROP_UNUSABLE; | |
867 | ||
868 | hdr = (struct ieee80211_hdr *)rx->skb->data; | |
869 | ||
870 | rx_pn = key->u.gen.rx_pn[qos_tid]; | |
871 | skb_pn = rx->skb->data + hdrlen + cs->pn_off; | |
872 | ||
873 | if (ieee80211_crypto_cs_pn_compare(skb_pn, rx_pn, cs->pn_len) <= 0) | |
874 | return RX_DROP_UNUSABLE; | |
875 | ||
876 | memcpy(rx_pn, skb_pn, cs->pn_len); | |
877 | ||
878 | /* remove security header and MIC */ | |
879 | if (pskb_trim(rx->skb, rx->skb->len - cs->mic_len)) | |
880 | return RX_DROP_UNUSABLE; | |
881 | ||
882 | memmove(rx->skb->data + cs->hdr_len, rx->skb->data, hdrlen); | |
883 | skb_pull(rx->skb, cs->hdr_len); | |
884 | ||
885 | return RX_CONTINUE; | |
886 | } | |
765cb46a JM |
887 | |
888 | static void bip_aad(struct sk_buff *skb, u8 *aad) | |
889 | { | |
33766368 JM |
890 | __le16 mask_fc; |
891 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
892 | ||
765cb46a JM |
893 | /* BIP AAD: FC(masked) || A1 || A2 || A3 */ |
894 | ||
895 | /* FC type/subtype */ | |
765cb46a | 896 | /* Mask FC Retry, PwrMgt, MoreData flags to zero */ |
33766368 JM |
897 | mask_fc = hdr->frame_control; |
898 | mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | IEEE80211_FCTL_PM | | |
899 | IEEE80211_FCTL_MOREDATA); | |
900 | put_unaligned(mask_fc, (__le16 *) &aad[0]); | |
765cb46a | 901 | /* A1 || A2 || A3 */ |
33766368 | 902 | memcpy(aad + 2, &hdr->addr1, 3 * ETH_ALEN); |
765cb46a JM |
903 | } |
904 | ||
905 | ||
75396ae6 JB |
906 | static inline void bip_ipn_set64(u8 *d, u64 pn) |
907 | { | |
908 | *d++ = pn; | |
909 | *d++ = pn >> 8; | |
910 | *d++ = pn >> 16; | |
911 | *d++ = pn >> 24; | |
912 | *d++ = pn >> 32; | |
913 | *d = pn >> 40; | |
914 | } | |
915 | ||
765cb46a JM |
916 | static inline void bip_ipn_swap(u8 *d, const u8 *s) |
917 | { | |
918 | *d++ = s[5]; | |
919 | *d++ = s[4]; | |
920 | *d++ = s[3]; | |
921 | *d++ = s[2]; | |
922 | *d++ = s[1]; | |
923 | *d = s[0]; | |
924 | } | |
925 | ||
926 | ||
927 | ieee80211_tx_result | |
928 | ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx) | |
929 | { | |
252b86c4 JB |
930 | struct sk_buff *skb; |
931 | struct ieee80211_tx_info *info; | |
765cb46a JM |
932 | struct ieee80211_key *key = tx->key; |
933 | struct ieee80211_mmie *mmie; | |
75396ae6 JB |
934 | u8 aad[20]; |
935 | u64 pn64; | |
765cb46a | 936 | |
252b86c4 JB |
937 | if (WARN_ON(skb_queue_len(&tx->skbs) != 1)) |
938 | return TX_DROP; | |
939 | ||
940 | skb = skb_peek(&tx->skbs); | |
941 | ||
942 | info = IEEE80211_SKB_CB(skb); | |
943 | ||
813d7669 | 944 | if (info->control.hw_key) |
252b86c4 | 945 | return TX_CONTINUE; |
765cb46a JM |
946 | |
947 | if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie))) | |
948 | return TX_DROP; | |
949 | ||
950 | mmie = (struct ieee80211_mmie *) skb_put(skb, sizeof(*mmie)); | |
951 | mmie->element_id = WLAN_EID_MMIE; | |
952 | mmie->length = sizeof(*mmie) - 2; | |
953 | mmie->key_id = cpu_to_le16(key->conf.keyidx); | |
954 | ||
955 | /* PN = PN + 1 */ | |
db388a56 | 956 | pn64 = atomic64_inc_return(&key->conf.tx_pn); |
765cb46a | 957 | |
75396ae6 | 958 | bip_ipn_set64(mmie->sequence_number, pn64); |
765cb46a JM |
959 | |
960 | bip_aad(skb, aad); | |
961 | ||
962 | /* | |
963 | * MIC = AES-128-CMAC(IGTK, AAD || Management Frame Body || MMIE, 64) | |
964 | */ | |
75396ae6 JB |
965 | ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad, |
966 | skb->data + 24, skb->len - 24, mmie->mic); | |
765cb46a JM |
967 | |
968 | return TX_CONTINUE; | |
969 | } | |
970 | ||
56c52da2 JM |
971 | ieee80211_tx_result |
972 | ieee80211_crypto_aes_cmac_256_encrypt(struct ieee80211_tx_data *tx) | |
973 | { | |
974 | struct sk_buff *skb; | |
975 | struct ieee80211_tx_info *info; | |
976 | struct ieee80211_key *key = tx->key; | |
977 | struct ieee80211_mmie_16 *mmie; | |
978 | u8 aad[20]; | |
979 | u64 pn64; | |
980 | ||
981 | if (WARN_ON(skb_queue_len(&tx->skbs) != 1)) | |
982 | return TX_DROP; | |
983 | ||
984 | skb = skb_peek(&tx->skbs); | |
985 | ||
986 | info = IEEE80211_SKB_CB(skb); | |
987 | ||
988 | if (info->control.hw_key) | |
989 | return TX_CONTINUE; | |
990 | ||
991 | if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie))) | |
992 | return TX_DROP; | |
993 | ||
994 | mmie = (struct ieee80211_mmie_16 *)skb_put(skb, sizeof(*mmie)); | |
995 | mmie->element_id = WLAN_EID_MMIE; | |
996 | mmie->length = sizeof(*mmie) - 2; | |
997 | mmie->key_id = cpu_to_le16(key->conf.keyidx); | |
998 | ||
999 | /* PN = PN + 1 */ | |
db388a56 | 1000 | pn64 = atomic64_inc_return(&key->conf.tx_pn); |
56c52da2 JM |
1001 | |
1002 | bip_ipn_set64(mmie->sequence_number, pn64); | |
1003 | ||
1004 | bip_aad(skb, aad); | |
1005 | ||
1006 | /* MIC = AES-256-CMAC(IGTK, AAD || Management Frame Body || MMIE, 128) | |
1007 | */ | |
1008 | ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad, | |
1009 | skb->data + 24, skb->len - 24, mmie->mic); | |
1010 | ||
1011 | return TX_CONTINUE; | |
1012 | } | |
765cb46a JM |
1013 | |
1014 | ieee80211_rx_result | |
1015 | ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx) | |
1016 | { | |
1017 | struct sk_buff *skb = rx->skb; | |
eb9fb5b8 | 1018 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
765cb46a JM |
1019 | struct ieee80211_key *key = rx->key; |
1020 | struct ieee80211_mmie *mmie; | |
1021 | u8 aad[20], mic[8], ipn[6]; | |
1022 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
1023 | ||
1024 | if (!ieee80211_is_mgmt(hdr->frame_control)) | |
1025 | return RX_CONTINUE; | |
1026 | ||
a8286911 JB |
1027 | /* management frames are already linear */ |
1028 | ||
765cb46a JM |
1029 | if (skb->len < 24 + sizeof(*mmie)) |
1030 | return RX_DROP_UNUSABLE; | |
1031 | ||
1032 | mmie = (struct ieee80211_mmie *) | |
1033 | (skb->data + skb->len - sizeof(*mmie)); | |
1034 | if (mmie->element_id != WLAN_EID_MMIE || | |
1035 | mmie->length != sizeof(*mmie) - 2) | |
1036 | return RX_DROP_UNUSABLE; /* Invalid MMIE */ | |
1037 | ||
1038 | bip_ipn_swap(ipn, mmie->sequence_number); | |
1039 | ||
1040 | if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) { | |
1041 | key->u.aes_cmac.replays++; | |
1042 | return RX_DROP_UNUSABLE; | |
1043 | } | |
1044 | ||
eb9fb5b8 | 1045 | if (!(status->flag & RX_FLAG_DECRYPTED)) { |
765cb46a JM |
1046 | /* hardware didn't decrypt/verify MIC */ |
1047 | bip_aad(skb, aad); | |
75396ae6 | 1048 | ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad, |
765cb46a JM |
1049 | skb->data + 24, skb->len - 24, mic); |
1050 | if (memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) { | |
1051 | key->u.aes_cmac.icverrors++; | |
1052 | return RX_DROP_UNUSABLE; | |
1053 | } | |
1054 | } | |
1055 | ||
1056 | memcpy(key->u.aes_cmac.rx_pn, ipn, 6); | |
1057 | ||
1058 | /* Remove MMIE */ | |
1059 | skb_trim(skb, skb->len - sizeof(*mmie)); | |
1060 | ||
1061 | return RX_CONTINUE; | |
1062 | } | |
d32a1028 | 1063 | |
56c52da2 JM |
1064 | ieee80211_rx_result |
1065 | ieee80211_crypto_aes_cmac_256_decrypt(struct ieee80211_rx_data *rx) | |
1066 | { | |
1067 | struct sk_buff *skb = rx->skb; | |
1068 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1069 | struct ieee80211_key *key = rx->key; | |
1070 | struct ieee80211_mmie_16 *mmie; | |
1071 | u8 aad[20], mic[16], ipn[6]; | |
1072 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
1073 | ||
1074 | if (!ieee80211_is_mgmt(hdr->frame_control)) | |
1075 | return RX_CONTINUE; | |
1076 | ||
1077 | /* management frames are already linear */ | |
1078 | ||
1079 | if (skb->len < 24 + sizeof(*mmie)) | |
1080 | return RX_DROP_UNUSABLE; | |
1081 | ||
1082 | mmie = (struct ieee80211_mmie_16 *) | |
1083 | (skb->data + skb->len - sizeof(*mmie)); | |
1084 | if (mmie->element_id != WLAN_EID_MMIE || | |
1085 | mmie->length != sizeof(*mmie) - 2) | |
1086 | return RX_DROP_UNUSABLE; /* Invalid MMIE */ | |
1087 | ||
1088 | bip_ipn_swap(ipn, mmie->sequence_number); | |
1089 | ||
1090 | if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) { | |
1091 | key->u.aes_cmac.replays++; | |
1092 | return RX_DROP_UNUSABLE; | |
1093 | } | |
1094 | ||
1095 | if (!(status->flag & RX_FLAG_DECRYPTED)) { | |
1096 | /* hardware didn't decrypt/verify MIC */ | |
1097 | bip_aad(skb, aad); | |
1098 | ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad, | |
1099 | skb->data + 24, skb->len - 24, mic); | |
1100 | if (memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) { | |
1101 | key->u.aes_cmac.icverrors++; | |
1102 | return RX_DROP_UNUSABLE; | |
1103 | } | |
1104 | } | |
1105 | ||
1106 | memcpy(key->u.aes_cmac.rx_pn, ipn, 6); | |
1107 | ||
1108 | /* Remove MMIE */ | |
1109 | skb_trim(skb, skb->len - sizeof(*mmie)); | |
1110 | ||
1111 | return RX_CONTINUE; | |
1112 | } | |
1113 | ||
8ade538b JM |
1114 | ieee80211_tx_result |
1115 | ieee80211_crypto_aes_gmac_encrypt(struct ieee80211_tx_data *tx) | |
1116 | { | |
1117 | struct sk_buff *skb; | |
1118 | struct ieee80211_tx_info *info; | |
1119 | struct ieee80211_key *key = tx->key; | |
1120 | struct ieee80211_mmie_16 *mmie; | |
1121 | struct ieee80211_hdr *hdr; | |
f4a067f9 | 1122 | u8 aad[GMAC_AAD_LEN]; |
8ade538b | 1123 | u64 pn64; |
f4a067f9 | 1124 | u8 nonce[GMAC_NONCE_LEN]; |
8ade538b JM |
1125 | |
1126 | if (WARN_ON(skb_queue_len(&tx->skbs) != 1)) | |
1127 | return TX_DROP; | |
1128 | ||
1129 | skb = skb_peek(&tx->skbs); | |
1130 | ||
1131 | info = IEEE80211_SKB_CB(skb); | |
1132 | ||
1133 | if (info->control.hw_key) | |
1134 | return TX_CONTINUE; | |
1135 | ||
1136 | if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie))) | |
1137 | return TX_DROP; | |
1138 | ||
1139 | mmie = (struct ieee80211_mmie_16 *)skb_put(skb, sizeof(*mmie)); | |
1140 | mmie->element_id = WLAN_EID_MMIE; | |
1141 | mmie->length = sizeof(*mmie) - 2; | |
1142 | mmie->key_id = cpu_to_le16(key->conf.keyidx); | |
1143 | ||
1144 | /* PN = PN + 1 */ | |
db388a56 | 1145 | pn64 = atomic64_inc_return(&key->conf.tx_pn); |
8ade538b JM |
1146 | |
1147 | bip_ipn_set64(mmie->sequence_number, pn64); | |
1148 | ||
1149 | bip_aad(skb, aad); | |
1150 | ||
1151 | hdr = (struct ieee80211_hdr *)skb->data; | |
1152 | memcpy(nonce, hdr->addr2, ETH_ALEN); | |
1153 | bip_ipn_swap(nonce + ETH_ALEN, mmie->sequence_number); | |
1154 | ||
1155 | /* MIC = AES-GMAC(IGTK, AAD || Management Frame Body || MMIE, 128) */ | |
1156 | if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce, | |
1157 | skb->data + 24, skb->len - 24, mmie->mic) < 0) | |
1158 | return TX_DROP; | |
1159 | ||
1160 | return TX_CONTINUE; | |
1161 | } | |
1162 | ||
1163 | ieee80211_rx_result | |
1164 | ieee80211_crypto_aes_gmac_decrypt(struct ieee80211_rx_data *rx) | |
1165 | { | |
1166 | struct sk_buff *skb = rx->skb; | |
1167 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1168 | struct ieee80211_key *key = rx->key; | |
1169 | struct ieee80211_mmie_16 *mmie; | |
f4a067f9 | 1170 | u8 aad[GMAC_AAD_LEN], mic[GMAC_MIC_LEN], ipn[6], nonce[GMAC_NONCE_LEN]; |
8ade538b JM |
1171 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
1172 | ||
1173 | if (!ieee80211_is_mgmt(hdr->frame_control)) | |
1174 | return RX_CONTINUE; | |
1175 | ||
1176 | /* management frames are already linear */ | |
1177 | ||
1178 | if (skb->len < 24 + sizeof(*mmie)) | |
1179 | return RX_DROP_UNUSABLE; | |
1180 | ||
1181 | mmie = (struct ieee80211_mmie_16 *) | |
1182 | (skb->data + skb->len - sizeof(*mmie)); | |
1183 | if (mmie->element_id != WLAN_EID_MMIE || | |
1184 | mmie->length != sizeof(*mmie) - 2) | |
1185 | return RX_DROP_UNUSABLE; /* Invalid MMIE */ | |
1186 | ||
1187 | bip_ipn_swap(ipn, mmie->sequence_number); | |
1188 | ||
1189 | if (memcmp(ipn, key->u.aes_gmac.rx_pn, 6) <= 0) { | |
1190 | key->u.aes_gmac.replays++; | |
1191 | return RX_DROP_UNUSABLE; | |
1192 | } | |
1193 | ||
1194 | if (!(status->flag & RX_FLAG_DECRYPTED)) { | |
1195 | /* hardware didn't decrypt/verify MIC */ | |
1196 | bip_aad(skb, aad); | |
1197 | ||
1198 | memcpy(nonce, hdr->addr2, ETH_ALEN); | |
1199 | memcpy(nonce + ETH_ALEN, ipn, 6); | |
1200 | ||
1201 | if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce, | |
1202 | skb->data + 24, skb->len - 24, | |
1203 | mic) < 0 || | |
1204 | memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) { | |
1205 | key->u.aes_gmac.icverrors++; | |
1206 | return RX_DROP_UNUSABLE; | |
1207 | } | |
1208 | } | |
1209 | ||
1210 | memcpy(key->u.aes_gmac.rx_pn, ipn, 6); | |
1211 | ||
1212 | /* Remove MMIE */ | |
1213 | skb_trim(skb, skb->len - sizeof(*mmie)); | |
1214 | ||
1215 | return RX_CONTINUE; | |
1216 | } | |
1217 | ||
d32a1028 YD |
1218 | ieee80211_tx_result |
1219 | ieee80211_crypto_hw_encrypt(struct ieee80211_tx_data *tx) | |
1220 | { | |
1221 | struct sk_buff *skb; | |
1222 | struct ieee80211_tx_info *info = NULL; | |
2475b1cc | 1223 | ieee80211_tx_result res; |
d32a1028 YD |
1224 | |
1225 | skb_queue_walk(&tx->skbs, skb) { | |
1226 | info = IEEE80211_SKB_CB(skb); | |
1227 | ||
1228 | /* handle hw-only algorithm */ | |
1229 | if (!info->control.hw_key) | |
1230 | return TX_DROP; | |
2475b1cc | 1231 | |
c7ef38e0 | 1232 | if (tx->key->flags & KEY_FLAG_CIPHER_SCHEME) { |
2475b1cc MS |
1233 | res = ieee80211_crypto_cs_encrypt(tx, skb); |
1234 | if (res != TX_CONTINUE) | |
1235 | return res; | |
1236 | } | |
d32a1028 YD |
1237 | } |
1238 | ||
1239 | ieee80211_tx_set_protected(tx); | |
1240 | ||
1241 | return TX_CONTINUE; | |
1242 | } | |
2475b1cc MS |
1243 | |
1244 | ieee80211_rx_result | |
1245 | ieee80211_crypto_hw_decrypt(struct ieee80211_rx_data *rx) | |
1246 | { | |
aeb136c5 | 1247 | if (rx->sta && rx->sta->cipher_scheme) |
2475b1cc MS |
1248 | return ieee80211_crypto_cs_decrypt(rx); |
1249 | ||
1250 | return RX_DROP_UNUSABLE; | |
1251 | } |