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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
f0706e82 JB |
2 | /* |
3 | * Copyright 2002-2004, Instant802 Networks, Inc. | |
765cb46a | 4 | * Copyright 2008, Jouni Malinen <j@w1.fi> |
9de18d81 | 5 | * Copyright (C) 2016-2017 Intel Deutschland GmbH |
23a5f0af | 6 | * Copyright (C) 2020-2022 Intel Corporation |
f0706e82 JB |
7 | */ |
8 | ||
9 | #include <linux/netdevice.h> | |
10 | #include <linux/types.h> | |
f0706e82 JB |
11 | #include <linux/skbuff.h> |
12 | #include <linux/compiler.h> | |
f14df804 | 13 | #include <linux/ieee80211.h> |
5a0e3ad6 | 14 | #include <linux/gfp.h> |
f14df804 | 15 | #include <asm/unaligned.h> |
f0706e82 | 16 | #include <net/mac80211.h> |
aba83a0b | 17 | #include <crypto/aes.h> |
98c67d18 | 18 | #include <crypto/algapi.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" |
8ade538b | 25 | #include "aes_gmac.h" |
00b9cfa3 | 26 | #include "aes_gcm.h" |
f0706e82 JB |
27 | #include "wpa.h" |
28 | ||
9ae54c84 | 29 | ieee80211_tx_result |
5cf121c3 | 30 | ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx) |
f0706e82 | 31 | { |
747d753d | 32 | u8 *data, *key, *mic; |
f0706e82 | 33 | size_t data_len; |
8e8862b7 HH |
34 | unsigned int hdrlen; |
35 | struct ieee80211_hdr *hdr; | |
f0706e82 | 36 | struct sk_buff *skb = tx->skb; |
813d7669 | 37 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
23c0752a | 38 | int tail; |
f0706e82 | 39 | |
c34498b9 | 40 | hdr = (struct ieee80211_hdr *)skb->data; |
97359d12 JB |
41 | if (!tx->key || tx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP || |
42 | skb->len < 24 || !ieee80211_is_data_present(hdr->frame_control)) | |
9ae54c84 | 43 | return TX_CONTINUE; |
f0706e82 | 44 | |
8e8862b7 HH |
45 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
46 | if (skb->len < hdrlen) | |
9ae54c84 | 47 | return TX_DROP; |
f0706e82 | 48 | |
8e8862b7 HH |
49 | data = skb->data + hdrlen; |
50 | data_len = skb->len - hdrlen; | |
51 | ||
681d1190 JM |
52 | if (unlikely(info->flags & IEEE80211_TX_INTFL_TKIP_MIC_FAILURE)) { |
53 | /* Need to use software crypto for the test */ | |
54 | info->control.hw_key = NULL; | |
55 | } | |
56 | ||
813d7669 | 57 | if (info->control.hw_key && |
a26eb27a | 58 | (info->flags & IEEE80211_TX_CTL_DONTFRAG || |
f3fe4e93 | 59 | ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) && |
9de18d81 DS |
60 | !(tx->key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC | |
61 | IEEE80211_KEY_FLAG_PUT_MIC_SPACE))) { | |
62 | /* hwaccel - with no need for SW-generated MMIC or MIC space */ | |
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 | |
f0706e82 | 77 | mic = skb_put(skb, MICHAEL_MIC_LEN); |
9de18d81 DS |
78 | |
79 | if (tx->key->conf.flags & IEEE80211_KEY_FLAG_PUT_MIC_SPACE) { | |
80 | /* Zeroed MIC can help with debug */ | |
81 | memset(mic, 0, MICHAEL_MIC_LEN); | |
82 | return TX_CONTINUE; | |
83 | } | |
84 | ||
85 | key = &tx->key->conf.key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY]; | |
8e8862b7 | 86 | michael_mic(key, hdr, data, data_len, mic); |
681d1190 JM |
87 | if (unlikely(info->flags & IEEE80211_TX_INTFL_TKIP_MIC_FAILURE)) |
88 | mic[0]++; | |
f0706e82 | 89 | |
9ae54c84 | 90 | return TX_CONTINUE; |
f0706e82 JB |
91 | } |
92 | ||
93 | ||
9ae54c84 | 94 | ieee80211_rx_result |
5cf121c3 | 95 | ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx) |
f0706e82 | 96 | { |
747d753d | 97 | u8 *data, *key = NULL; |
f0706e82 | 98 | size_t data_len; |
8e8862b7 | 99 | unsigned int hdrlen; |
f0706e82 JB |
100 | u8 mic[MICHAEL_MIC_LEN]; |
101 | struct sk_buff *skb = rx->skb; | |
eb9fb5b8 JB |
102 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
103 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
f0706e82 | 104 | |
816c04fe CL |
105 | /* |
106 | * it makes no sense to check for MIC errors on anything other | |
107 | * than data frames. | |
108 | */ | |
109 | if (!ieee80211_is_data_present(hdr->frame_control)) | |
9ae54c84 | 110 | return RX_CONTINUE; |
f0706e82 | 111 | |
816c04fe CL |
112 | /* |
113 | * No way to verify the MIC if the hardware stripped it or | |
114 | * the IV with the key index. In this case we have solely rely | |
115 | * on the driver to set RX_FLAG_MMIC_ERROR in the event of a | |
116 | * MIC failure report. | |
117 | */ | |
118 | if (status->flag & (RX_FLAG_MMIC_STRIPPED | RX_FLAG_IV_STRIPPED)) { | |
119 | if (status->flag & RX_FLAG_MMIC_ERROR) | |
b98ea058 | 120 | goto mic_fail_no_key; |
816c04fe | 121 | |
4045f72b SG |
122 | if (!(status->flag & RX_FLAG_IV_STRIPPED) && rx->key && |
123 | rx->key->conf.cipher == WLAN_CIPHER_SUITE_TKIP) | |
816c04fe CL |
124 | goto update_iv; |
125 | ||
126 | return RX_CONTINUE; | |
127 | } | |
128 | ||
129 | /* | |
130 | * Some hardware seems to generate Michael MIC failure reports; even | |
131 | * though, the frame was not encrypted with TKIP and therefore has no | |
132 | * MIC. Ignore the flag them to avoid triggering countermeasures. | |
133 | */ | |
97359d12 | 134 | if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP || |
816c04fe | 135 | !(status->flag & RX_FLAG_DECRYPTED)) |
9ae54c84 | 136 | return RX_CONTINUE; |
f0706e82 | 137 | |
816c04fe CL |
138 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP && rx->key->conf.keyidx) { |
139 | /* | |
140 | * APs with pairwise keys should never receive Michael MIC | |
141 | * errors for non-zero keyidx because these are reserved for | |
142 | * group keys and only the AP is sending real multicast | |
87ee475e | 143 | * frames in the BSS. |
816c04fe CL |
144 | */ |
145 | return RX_DROP_UNUSABLE; | |
146 | } | |
147 | ||
148 | if (status->flag & RX_FLAG_MMIC_ERROR) | |
149 | goto mic_fail; | |
150 | ||
8e8862b7 HH |
151 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
152 | if (skb->len < hdrlen + MICHAEL_MIC_LEN) | |
e4c26add | 153 | return RX_DROP_UNUSABLE; |
f0706e82 | 154 | |
a8286911 JB |
155 | if (skb_linearize(rx->skb)) |
156 | return RX_DROP_UNUSABLE; | |
157 | hdr = (void *)skb->data; | |
158 | ||
8e8862b7 HH |
159 | data = skb->data + hdrlen; |
160 | data_len = skb->len - hdrlen - MICHAEL_MIC_LEN; | |
747d753d | 161 | key = &rx->key->conf.key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY]; |
8e8862b7 | 162 | michael_mic(key, hdr, data, data_len, mic); |
98c67d18 | 163 | if (crypto_memneq(mic, data + data_len, MICHAEL_MIC_LEN)) |
816c04fe | 164 | goto mic_fail; |
f0706e82 | 165 | |
f0706e82 JB |
166 | /* remove Michael MIC from payload */ |
167 | skb_trim(skb, skb->len - MICHAEL_MIC_LEN); | |
168 | ||
816c04fe | 169 | update_iv: |
50741ae0 | 170 | /* update IV in key information to be able to detect replays */ |
bf30ca92 JB |
171 | rx->key->u.tkip.rx[rx->security_idx].iv32 = rx->tkip.iv32; |
172 | rx->key->u.tkip.rx[rx->security_idx].iv16 = rx->tkip.iv16; | |
50741ae0 | 173 | |
9ae54c84 | 174 | return RX_CONTINUE; |
816c04fe CL |
175 | |
176 | mic_fail: | |
b98ea058 S |
177 | rx->key->u.tkip.mic_failures++; |
178 | ||
179 | mic_fail_no_key: | |
a66b98db AN |
180 | /* |
181 | * In some cases the key can be unset - e.g. a multicast packet, in | |
182 | * a driver that supports HW encryption. Send up the key idx only if | |
183 | * the key is set. | |
184 | */ | |
6f1f5d5f JB |
185 | cfg80211_michael_mic_failure(rx->sdata->dev, hdr->addr2, |
186 | is_multicast_ether_addr(hdr->addr1) ? | |
187 | NL80211_KEYTYPE_GROUP : | |
188 | NL80211_KEYTYPE_PAIRWISE, | |
189 | rx->key ? rx->key->conf.keyidx : -1, | |
190 | NULL, GFP_ATOMIC); | |
816c04fe | 191 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
192 | } |
193 | ||
e039fa4a | 194 | static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb) |
f0706e82 JB |
195 | { |
196 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
197 | struct ieee80211_key *key = tx->key; | |
e039fa4a | 198 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
d5184cac HH |
199 | unsigned int hdrlen; |
200 | int len, tail; | |
f8079d43 | 201 | u64 pn; |
f0706e82 JB |
202 | u8 *pos; |
203 | ||
813d7669 | 204 | if (info->control.hw_key && |
ee70108f JD |
205 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) && |
206 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) { | |
813d7669 | 207 | /* hwaccel - with no need for software-generated IV */ |
23c0752a | 208 | return 0; |
e039fa4a JB |
209 | } |
210 | ||
d5184cac | 211 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 JB |
212 | len = skb->len - hdrlen; |
213 | ||
813d7669 | 214 | if (info->control.hw_key) |
23c0752a | 215 | tail = 0; |
11a843b7 | 216 | else |
4325f6ca | 217 | tail = IEEE80211_TKIP_ICV_LEN; |
23c0752a JB |
218 | |
219 | if (WARN_ON(skb_tailroom(skb) < tail || | |
4325f6ca | 220 | skb_headroom(skb) < IEEE80211_TKIP_IV_LEN)) |
23c0752a | 221 | return -1; |
f0706e82 | 222 | |
4325f6ca JB |
223 | pos = skb_push(skb, IEEE80211_TKIP_IV_LEN); |
224 | memmove(pos, pos + IEEE80211_TKIP_IV_LEN, hdrlen); | |
f0706e82 JB |
225 | pos += hdrlen; |
226 | ||
ee70108f JD |
227 | /* the HW only needs room for the IV, but not the actual IV */ |
228 | if (info->control.hw_key && | |
229 | (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) | |
230 | return 0; | |
231 | ||
f0706e82 | 232 | /* Increase IV for the frame */ |
f8079d43 EP |
233 | pn = atomic64_inc_return(&key->conf.tx_pn); |
234 | pos = ieee80211_tkip_add_iv(pos, &key->conf, pn); | |
f0706e82 | 235 | |
813d7669 JB |
236 | /* hwaccel - with software IV */ |
237 | if (info->control.hw_key) | |
f0706e82 | 238 | return 0; |
f0706e82 JB |
239 | |
240 | /* Add room for ICV */ | |
4325f6ca | 241 | skb_put(skb, IEEE80211_TKIP_ICV_LEN); |
f0706e82 | 242 | |
5fdb3735 | 243 | return ieee80211_tkip_encrypt_data(&tx->local->wep_tx_ctx, |
523b02ea | 244 | key, skb, pos, len); |
f0706e82 JB |
245 | } |
246 | ||
247 | ||
9ae54c84 | 248 | ieee80211_tx_result |
5cf121c3 | 249 | ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx) |
f0706e82 | 250 | { |
252b86c4 | 251 | struct sk_buff *skb; |
f0706e82 | 252 | |
5cf121c3 | 253 | ieee80211_tx_set_protected(tx); |
f0706e82 | 254 | |
252b86c4 | 255 | skb_queue_walk(&tx->skbs, skb) { |
2de8e0d9 JB |
256 | if (tkip_encrypt_skb(tx, skb) < 0) |
257 | return TX_DROP; | |
252b86c4 | 258 | } |
f0706e82 | 259 | |
9ae54c84 | 260 | return TX_CONTINUE; |
f0706e82 JB |
261 | } |
262 | ||
263 | ||
9ae54c84 | 264 | ieee80211_rx_result |
5cf121c3 | 265 | ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx) |
f0706e82 JB |
266 | { |
267 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; | |
747d753d | 268 | int hdrlen, res, hwaccel = 0; |
f0706e82 JB |
269 | struct ieee80211_key *key = rx->key; |
270 | struct sk_buff *skb = rx->skb; | |
eb9fb5b8 | 271 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
f0706e82 | 272 | |
d5184cac | 273 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 | 274 | |
c34498b9 | 275 | if (!ieee80211_is_data(hdr->frame_control)) |
9ae54c84 | 276 | return RX_CONTINUE; |
f0706e82 JB |
277 | |
278 | if (!rx->sta || skb->len - hdrlen < 12) | |
e4c26add | 279 | return RX_DROP_UNUSABLE; |
f0706e82 | 280 | |
a8286911 JB |
281 | /* it may be possible to optimize this a bit more */ |
282 | if (skb_linearize(rx->skb)) | |
283 | return RX_DROP_UNUSABLE; | |
284 | hdr = (void *)skb->data; | |
285 | ||
dc1580dd JB |
286 | /* |
287 | * Let TKIP code verify IV, but skip decryption. | |
288 | * In the case where hardware checks the IV as well, | |
289 | * we don't even get here, see ieee80211_rx_h_decrypt() | |
290 | */ | |
291 | if (status->flag & RX_FLAG_DECRYPTED) | |
f0706e82 | 292 | hwaccel = 1; |
f0706e82 | 293 | |
5fdb3735 | 294 | res = ieee80211_tkip_decrypt_data(&rx->local->wep_rx_ctx, |
f0706e82 | 295 | key, skb->data + hdrlen, |
17741cdc | 296 | skb->len - hdrlen, rx->sta->sta.addr, |
9e26297a | 297 | hdr->addr1, hwaccel, rx->security_idx, |
bf30ca92 JB |
298 | &rx->tkip.iv32, |
299 | &rx->tkip.iv16); | |
747d753d | 300 | if (res != TKIP_DECRYPT_OK) |
e4c26add | 301 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
302 | |
303 | /* Trim ICV */ | |
cef0acd4 DS |
304 | if (!(status->flag & RX_FLAG_ICV_STRIPPED)) |
305 | skb_trim(skb, skb->len - IEEE80211_TKIP_ICV_LEN); | |
f0706e82 JB |
306 | |
307 | /* Remove IV */ | |
4325f6ca JB |
308 | memmove(skb->data + IEEE80211_TKIP_IV_LEN, skb->data, hdrlen); |
309 | skb_pull(skb, IEEE80211_TKIP_IV_LEN); | |
f0706e82 | 310 | |
9ae54c84 | 311 | return RX_CONTINUE; |
f0706e82 JB |
312 | } |
313 | ||
97f7a470 JB |
314 | /* |
315 | * Calculate AAD for CCMP/GCMP, returning qos_tid since we | |
316 | * need that in CCMP also for b_0. | |
317 | */ | |
318 | static u8 ccmp_gcmp_aad(struct sk_buff *skb, u8 *aad) | |
f0706e82 | 319 | { |
97f7a470 | 320 | struct ieee80211_hdr *hdr = (void *)skb->data; |
f14df804 | 321 | __le16 mask_fc; |
fb733336 | 322 | int a4_included, mgmt; |
f14df804 | 323 | u8 qos_tid; |
fa4d58da | 324 | u16 len_a = 22; |
f0706e82 | 325 | |
f14df804 | 326 | /* |
fb733336 | 327 | * Mask FC: zero subtype b4 b5 b6 (if not mgmt) |
fa4d58da | 328 | * Retry, PwrMgt, MoreData, Order (if Qos Data); set Protected |
f14df804 | 329 | */ |
fb733336 | 330 | mgmt = ieee80211_is_mgmt(hdr->frame_control); |
f14df804 | 331 | mask_fc = hdr->frame_control; |
fb733336 | 332 | mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | |
f14df804 | 333 | IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA); |
fb733336 JM |
334 | if (!mgmt) |
335 | mask_fc &= ~cpu_to_le16(0x0070); | |
f14df804 HH |
336 | mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); |
337 | ||
f14df804 | 338 | a4_included = ieee80211_has_a4(hdr->frame_control); |
fa4d58da PKS |
339 | if (a4_included) |
340 | len_a += 6; | |
f0706e82 | 341 | |
fa4d58da | 342 | if (ieee80211_is_data_qos(hdr->frame_control)) { |
a1f2ba04 | 343 | qos_tid = ieee80211_get_tid(hdr); |
fa4d58da PKS |
344 | mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_ORDER); |
345 | len_a += 2; | |
346 | } else { | |
f14df804 | 347 | qos_tid = 0; |
fa4d58da | 348 | } |
f14df804 | 349 | |
f0706e82 JB |
350 | /* AAD (extra authenticate-only data) / masked 802.11 header |
351 | * FC | A1 | A2 | A3 | SC | [A4] | [QC] */ | |
f14df804 HH |
352 | put_unaligned_be16(len_a, &aad[0]); |
353 | put_unaligned(mask_fc, (__le16 *)&aad[2]); | |
2aec9099 | 354 | memcpy(&aad[4], &hdr->addrs, 3 * ETH_ALEN); |
f0706e82 JB |
355 | |
356 | /* Mask Seq#, leave Frag# */ | |
357 | aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f; | |
358 | aad[23] = 0; | |
f14df804 | 359 | |
f0706e82 | 360 | if (a4_included) { |
73e1f7c8 | 361 | memcpy(&aad[24], hdr->addr4, ETH_ALEN); |
f14df804 | 362 | aad[30] = qos_tid; |
f0706e82 | 363 | aad[31] = 0; |
f14df804 | 364 | } else { |
73e1f7c8 | 365 | memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN); |
f14df804 | 366 | aad[24] = qos_tid; |
f0706e82 | 367 | } |
97f7a470 JB |
368 | |
369 | return qos_tid; | |
f0706e82 JB |
370 | } |
371 | ||
97f7a470 JB |
372 | static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad) |
373 | { | |
374 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
375 | u8 qos_tid = ccmp_gcmp_aad(skb, aad); | |
376 | ||
377 | /* In CCM, the initial vectors (IV) used for CTR mode encryption and CBC | |
378 | * mode authentication are not allowed to collide, yet both are derived | |
379 | * from this vector b_0. We only set L := 1 here to indicate that the | |
380 | * data size can be represented in (L+1) bytes. The CCM layer will take | |
381 | * care of storing the data length in the top (L+1) bytes and setting | |
382 | * and clearing the other bits as is required to derive the two IVs. | |
383 | */ | |
384 | b_0[0] = 0x1; | |
385 | ||
386 | /* Nonce: Nonce Flags | A2 | PN | |
387 | * Nonce Flags: Priority (b0..b3) | Management (b4) | Reserved (b5..b7) | |
388 | */ | |
389 | b_0[1] = qos_tid | (ieee80211_is_mgmt(hdr->frame_control) << 4); | |
390 | memcpy(&b_0[2], hdr->addr2, ETH_ALEN); | |
391 | memcpy(&b_0[8], pn, IEEE80211_CCMP_PN_LEN); | |
392 | } | |
f0706e82 JB |
393 | |
394 | static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn, int key_id) | |
395 | { | |
396 | hdr[0] = pn[5]; | |
397 | hdr[1] = pn[4]; | |
398 | hdr[2] = 0; | |
399 | hdr[3] = 0x20 | (key_id << 6); | |
400 | hdr[4] = pn[3]; | |
401 | hdr[5] = pn[2]; | |
402 | hdr[6] = pn[1]; | |
403 | hdr[7] = pn[0]; | |
404 | } | |
405 | ||
406 | ||
c6a1fa12 | 407 | static inline void ccmp_hdr2pn(u8 *pn, u8 *hdr) |
f0706e82 JB |
408 | { |
409 | pn[0] = hdr[7]; | |
410 | pn[1] = hdr[6]; | |
411 | pn[2] = hdr[5]; | |
412 | pn[3] = hdr[4]; | |
413 | pn[4] = hdr[1]; | |
414 | pn[5] = hdr[0]; | |
f0706e82 JB |
415 | } |
416 | ||
417 | ||
2b2ba0db JM |
418 | static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb, |
419 | unsigned int mic_len) | |
f0706e82 JB |
420 | { |
421 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
422 | struct ieee80211_key *key = tx->key; | |
e039fa4a | 423 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
23c0752a | 424 | int hdrlen, len, tail; |
aba83a0b JB |
425 | u8 *pos; |
426 | u8 pn[6]; | |
427 | u64 pn64; | |
f4a067f9 | 428 | u8 aad[CCM_AAD_LEN]; |
7ec7c4a9 | 429 | u8 b_0[AES_BLOCK_SIZE]; |
f0706e82 | 430 | |
813d7669 | 431 | if (info->control.hw_key && |
077a9154 | 432 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) && |
17d38fa8 MK |
433 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) && |
434 | !((info->control.hw_key->flags & | |
435 | IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) && | |
436 | ieee80211_is_mgmt(hdr->frame_control))) { | |
813d7669 JB |
437 | /* |
438 | * hwaccel has no need for preallocated room for CCMP | |
439 | * header or MIC fields | |
440 | */ | |
23c0752a | 441 | return 0; |
e039fa4a JB |
442 | } |
443 | ||
d5184cac | 444 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 JB |
445 | len = skb->len - hdrlen; |
446 | ||
813d7669 | 447 | if (info->control.hw_key) |
23c0752a | 448 | tail = 0; |
11a843b7 | 449 | else |
2b2ba0db | 450 | tail = mic_len; |
23c0752a JB |
451 | |
452 | if (WARN_ON(skb_tailroom(skb) < tail || | |
4325f6ca | 453 | skb_headroom(skb) < IEEE80211_CCMP_HDR_LEN)) |
23c0752a | 454 | return -1; |
f0706e82 | 455 | |
4325f6ca JB |
456 | pos = skb_push(skb, IEEE80211_CCMP_HDR_LEN); |
457 | memmove(pos, pos + IEEE80211_CCMP_HDR_LEN, hdrlen); | |
077a9154 AN |
458 | |
459 | /* the HW only needs room for the IV, but not the actual IV */ | |
e0830f71 AN |
460 | if (info->control.hw_key && |
461 | (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) | |
077a9154 AN |
462 | return 0; |
463 | ||
f0706e82 JB |
464 | pos += hdrlen; |
465 | ||
db388a56 | 466 | pn64 = atomic64_inc_return(&key->conf.tx_pn); |
f0706e82 | 467 | |
aba83a0b JB |
468 | pn[5] = pn64; |
469 | pn[4] = pn64 >> 8; | |
470 | pn[3] = pn64 >> 16; | |
471 | pn[2] = pn64 >> 24; | |
472 | pn[1] = pn64 >> 32; | |
473 | pn[0] = pn64 >> 40; | |
f0706e82 | 474 | |
8f20fc24 | 475 | ccmp_pn2hdr(pos, pn, key->conf.keyidx); |
f0706e82 | 476 | |
813d7669 JB |
477 | /* hwaccel - with software CCMP header */ |
478 | if (info->control.hw_key) | |
f0706e82 | 479 | return 0; |
f0706e82 | 480 | |
4325f6ca | 481 | pos += IEEE80211_CCMP_HDR_LEN; |
30ef7ef9 | 482 | ccmp_special_blocks(skb, pn, b_0, aad); |
f4a067f9 | 483 | return ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, b_0, aad, pos, len, |
4133da73 | 484 | skb_put(skb, mic_len)); |
f0706e82 JB |
485 | } |
486 | ||
487 | ||
9ae54c84 | 488 | ieee80211_tx_result |
2b2ba0db JM |
489 | ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx, |
490 | unsigned int mic_len) | |
f0706e82 | 491 | { |
252b86c4 | 492 | struct sk_buff *skb; |
f0706e82 | 493 | |
5cf121c3 | 494 | ieee80211_tx_set_protected(tx); |
f0706e82 | 495 | |
252b86c4 | 496 | skb_queue_walk(&tx->skbs, skb) { |
2b2ba0db | 497 | if (ccmp_encrypt_skb(tx, skb, mic_len) < 0) |
2de8e0d9 | 498 | return TX_DROP; |
252b86c4 | 499 | } |
f0706e82 | 500 | |
9ae54c84 | 501 | return TX_CONTINUE; |
f0706e82 JB |
502 | } |
503 | ||
504 | ||
9ae54c84 | 505 | ieee80211_rx_result |
2b2ba0db JM |
506 | ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx, |
507 | unsigned int mic_len) | |
f0706e82 | 508 | { |
c34498b9 | 509 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
f0706e82 JB |
510 | int hdrlen; |
511 | struct ieee80211_key *key = rx->key; | |
512 | struct sk_buff *skb = rx->skb; | |
eb9fb5b8 | 513 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
4325f6ca | 514 | u8 pn[IEEE80211_CCMP_PN_LEN]; |
f0706e82 | 515 | int data_len; |
9190252c | 516 | int queue; |
f0706e82 | 517 | |
d5184cac | 518 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 | 519 | |
fb733336 | 520 | if (!ieee80211_is_data(hdr->frame_control) && |
d8ca16db | 521 | !ieee80211_is_robust_mgmt_frame(skb)) |
9ae54c84 | 522 | return RX_CONTINUE; |
f0706e82 | 523 | |
a8286911 | 524 | if (status->flag & RX_FLAG_DECRYPTED) { |
4325f6ca | 525 | if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_CCMP_HDR_LEN)) |
a8286911 | 526 | return RX_DROP_UNUSABLE; |
f980ebc0 SS |
527 | if (status->flag & RX_FLAG_MIC_STRIPPED) |
528 | mic_len = 0; | |
a8286911 JB |
529 | } else { |
530 | if (skb_linearize(rx->skb)) | |
531 | return RX_DROP_UNUSABLE; | |
532 | } | |
533 | ||
94513069 JB |
534 | /* reload hdr - skb might have been reallocated */ |
535 | hdr = (void *)rx->skb->data; | |
536 | ||
f980ebc0 SS |
537 | data_len = skb->len - hdrlen - IEEE80211_CCMP_HDR_LEN - mic_len; |
538 | if (!rx->sta || data_len < 0) | |
539 | return RX_DROP_UNUSABLE; | |
540 | ||
981d94a8 | 541 | if (!(status->flag & RX_FLAG_PN_VALIDATED)) { |
f631a77b SS |
542 | int res; |
543 | ||
981d94a8 | 544 | ccmp_hdr2pn(pn, skb->data + hdrlen); |
f0706e82 | 545 | |
981d94a8 | 546 | queue = rx->security_idx; |
9190252c | 547 | |
f631a77b SS |
548 | res = memcmp(pn, key->u.ccmp.rx_pn[queue], |
549 | IEEE80211_CCMP_PN_LEN); | |
550 | if (res < 0 || | |
551 | (!res && !(status->flag & RX_FLAG_ALLOW_SAME_PN))) { | |
981d94a8 | 552 | key->u.ccmp.replays++; |
e4c26add | 553 | return RX_DROP_UNUSABLE; |
981d94a8 JB |
554 | } |
555 | ||
556 | if (!(status->flag & RX_FLAG_DECRYPTED)) { | |
557 | u8 aad[2 * AES_BLOCK_SIZE]; | |
558 | u8 b_0[AES_BLOCK_SIZE]; | |
559 | /* hardware didn't decrypt/verify MIC */ | |
560 | ccmp_special_blocks(skb, pn, b_0, aad); | |
561 | ||
562 | if (ieee80211_aes_ccm_decrypt( | |
563 | key->u.ccmp.tfm, b_0, aad, | |
564 | skb->data + hdrlen + IEEE80211_CCMP_HDR_LEN, | |
565 | data_len, | |
4133da73 | 566 | skb->data + skb->len - mic_len)) |
981d94a8 JB |
567 | return RX_DROP_UNUSABLE; |
568 | } | |
569 | ||
570 | memcpy(key->u.ccmp.rx_pn[queue], pn, IEEE80211_CCMP_PN_LEN); | |
bf30ca92 JB |
571 | if (unlikely(ieee80211_is_frag(hdr))) |
572 | memcpy(rx->ccm_gcm.pn, pn, IEEE80211_CCMP_PN_LEN); | |
f0706e82 JB |
573 | } |
574 | ||
f0706e82 | 575 | /* Remove CCMP header and MIC */ |
2b2ba0db | 576 | if (pskb_trim(skb, skb->len - mic_len)) |
a8286911 | 577 | return RX_DROP_UNUSABLE; |
4325f6ca JB |
578 | memmove(skb->data + IEEE80211_CCMP_HDR_LEN, skb->data, hdrlen); |
579 | skb_pull(skb, IEEE80211_CCMP_HDR_LEN); | |
f0706e82 | 580 | |
9ae54c84 | 581 | return RX_CONTINUE; |
f0706e82 | 582 | } |
765cb46a | 583 | |
00b9cfa3 JM |
584 | static void gcmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *j_0, u8 *aad) |
585 | { | |
97f7a470 | 586 | struct ieee80211_hdr *hdr = (void *)skb->data; |
00b9cfa3 JM |
587 | |
588 | memcpy(j_0, hdr->addr2, ETH_ALEN); | |
589 | memcpy(&j_0[ETH_ALEN], pn, IEEE80211_GCMP_PN_LEN); | |
590 | j_0[13] = 0; | |
591 | j_0[14] = 0; | |
592 | j_0[AES_BLOCK_SIZE - 1] = 0x01; | |
593 | ||
97f7a470 | 594 | ccmp_gcmp_aad(skb, aad); |
00b9cfa3 JM |
595 | } |
596 | ||
597 | static inline void gcmp_pn2hdr(u8 *hdr, const u8 *pn, int key_id) | |
598 | { | |
599 | hdr[0] = pn[5]; | |
600 | hdr[1] = pn[4]; | |
601 | hdr[2] = 0; | |
602 | hdr[3] = 0x20 | (key_id << 6); | |
603 | hdr[4] = pn[3]; | |
604 | hdr[5] = pn[2]; | |
605 | hdr[6] = pn[1]; | |
606 | hdr[7] = pn[0]; | |
607 | } | |
608 | ||
609 | static inline void gcmp_hdr2pn(u8 *pn, const u8 *hdr) | |
610 | { | |
611 | pn[0] = hdr[7]; | |
612 | pn[1] = hdr[6]; | |
613 | pn[2] = hdr[5]; | |
614 | pn[3] = hdr[4]; | |
615 | pn[4] = hdr[1]; | |
616 | pn[5] = hdr[0]; | |
617 | } | |
618 | ||
619 | static int gcmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb) | |
620 | { | |
621 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
622 | struct ieee80211_key *key = tx->key; | |
623 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
624 | int hdrlen, len, tail; | |
625 | u8 *pos; | |
626 | u8 pn[6]; | |
627 | u64 pn64; | |
f4a067f9 | 628 | u8 aad[GCM_AAD_LEN]; |
00b9cfa3 JM |
629 | u8 j_0[AES_BLOCK_SIZE]; |
630 | ||
631 | if (info->control.hw_key && | |
632 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) && | |
633 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) && | |
634 | !((info->control.hw_key->flags & | |
635 | IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) && | |
636 | ieee80211_is_mgmt(hdr->frame_control))) { | |
637 | /* hwaccel has no need for preallocated room for GCMP | |
638 | * header or MIC fields | |
639 | */ | |
640 | return 0; | |
641 | } | |
642 | ||
643 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
644 | len = skb->len - hdrlen; | |
645 | ||
646 | if (info->control.hw_key) | |
647 | tail = 0; | |
648 | else | |
649 | tail = IEEE80211_GCMP_MIC_LEN; | |
650 | ||
651 | if (WARN_ON(skb_tailroom(skb) < tail || | |
652 | skb_headroom(skb) < IEEE80211_GCMP_HDR_LEN)) | |
653 | return -1; | |
654 | ||
655 | pos = skb_push(skb, IEEE80211_GCMP_HDR_LEN); | |
656 | memmove(pos, pos + IEEE80211_GCMP_HDR_LEN, hdrlen); | |
657 | skb_set_network_header(skb, skb_network_offset(skb) + | |
658 | IEEE80211_GCMP_HDR_LEN); | |
659 | ||
660 | /* the HW only needs room for the IV, but not the actual IV */ | |
661 | if (info->control.hw_key && | |
662 | (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) | |
663 | return 0; | |
664 | ||
00b9cfa3 JM |
665 | pos += hdrlen; |
666 | ||
db388a56 | 667 | pn64 = atomic64_inc_return(&key->conf.tx_pn); |
00b9cfa3 JM |
668 | |
669 | pn[5] = pn64; | |
670 | pn[4] = pn64 >> 8; | |
671 | pn[3] = pn64 >> 16; | |
672 | pn[2] = pn64 >> 24; | |
673 | pn[1] = pn64 >> 32; | |
674 | pn[0] = pn64 >> 40; | |
675 | ||
676 | gcmp_pn2hdr(pos, pn, key->conf.keyidx); | |
677 | ||
678 | /* hwaccel - with software GCMP header */ | |
679 | if (info->control.hw_key) | |
680 | return 0; | |
681 | ||
682 | pos += IEEE80211_GCMP_HDR_LEN; | |
683 | gcmp_special_blocks(skb, pn, j_0, aad); | |
f4a067f9 AB |
684 | return ieee80211_aes_gcm_encrypt(key->u.gcmp.tfm, j_0, aad, pos, len, |
685 | skb_put(skb, IEEE80211_GCMP_MIC_LEN)); | |
00b9cfa3 JM |
686 | } |
687 | ||
688 | ieee80211_tx_result | |
689 | ieee80211_crypto_gcmp_encrypt(struct ieee80211_tx_data *tx) | |
690 | { | |
691 | struct sk_buff *skb; | |
692 | ||
693 | ieee80211_tx_set_protected(tx); | |
694 | ||
695 | skb_queue_walk(&tx->skbs, skb) { | |
696 | if (gcmp_encrypt_skb(tx, skb) < 0) | |
697 | return TX_DROP; | |
698 | } | |
699 | ||
700 | return TX_CONTINUE; | |
701 | } | |
702 | ||
703 | ieee80211_rx_result | |
704 | ieee80211_crypto_gcmp_decrypt(struct ieee80211_rx_data *rx) | |
705 | { | |
706 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; | |
707 | int hdrlen; | |
708 | struct ieee80211_key *key = rx->key; | |
709 | struct sk_buff *skb = rx->skb; | |
710 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
711 | u8 pn[IEEE80211_GCMP_PN_LEN]; | |
f980ebc0 | 712 | int data_len, queue, mic_len = IEEE80211_GCMP_MIC_LEN; |
00b9cfa3 JM |
713 | |
714 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
715 | ||
716 | if (!ieee80211_is_data(hdr->frame_control) && | |
717 | !ieee80211_is_robust_mgmt_frame(skb)) | |
718 | return RX_CONTINUE; | |
719 | ||
00b9cfa3 JM |
720 | if (status->flag & RX_FLAG_DECRYPTED) { |
721 | if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_GCMP_HDR_LEN)) | |
722 | return RX_DROP_UNUSABLE; | |
f980ebc0 SS |
723 | if (status->flag & RX_FLAG_MIC_STRIPPED) |
724 | mic_len = 0; | |
00b9cfa3 JM |
725 | } else { |
726 | if (skb_linearize(rx->skb)) | |
727 | return RX_DROP_UNUSABLE; | |
728 | } | |
729 | ||
94513069 JB |
730 | /* reload hdr - skb might have been reallocated */ |
731 | hdr = (void *)rx->skb->data; | |
732 | ||
f980ebc0 SS |
733 | data_len = skb->len - hdrlen - IEEE80211_GCMP_HDR_LEN - mic_len; |
734 | if (!rx->sta || data_len < 0) | |
735 | return RX_DROP_UNUSABLE; | |
736 | ||
981d94a8 | 737 | if (!(status->flag & RX_FLAG_PN_VALIDATED)) { |
f631a77b SS |
738 | int res; |
739 | ||
981d94a8 | 740 | gcmp_hdr2pn(pn, skb->data + hdrlen); |
00b9cfa3 | 741 | |
981d94a8 | 742 | queue = rx->security_idx; |
00b9cfa3 | 743 | |
f631a77b SS |
744 | res = memcmp(pn, key->u.gcmp.rx_pn[queue], |
745 | IEEE80211_GCMP_PN_LEN); | |
746 | if (res < 0 || | |
747 | (!res && !(status->flag & RX_FLAG_ALLOW_SAME_PN))) { | |
981d94a8 | 748 | key->u.gcmp.replays++; |
00b9cfa3 | 749 | return RX_DROP_UNUSABLE; |
981d94a8 JB |
750 | } |
751 | ||
752 | if (!(status->flag & RX_FLAG_DECRYPTED)) { | |
753 | u8 aad[2 * AES_BLOCK_SIZE]; | |
754 | u8 j_0[AES_BLOCK_SIZE]; | |
755 | /* hardware didn't decrypt/verify MIC */ | |
756 | gcmp_special_blocks(skb, pn, j_0, aad); | |
757 | ||
758 | if (ieee80211_aes_gcm_decrypt( | |
759 | key->u.gcmp.tfm, j_0, aad, | |
760 | skb->data + hdrlen + IEEE80211_GCMP_HDR_LEN, | |
761 | data_len, | |
762 | skb->data + skb->len - | |
763 | IEEE80211_GCMP_MIC_LEN)) | |
764 | return RX_DROP_UNUSABLE; | |
765 | } | |
766 | ||
767 | memcpy(key->u.gcmp.rx_pn[queue], pn, IEEE80211_GCMP_PN_LEN); | |
bf30ca92 JB |
768 | if (unlikely(ieee80211_is_frag(hdr))) |
769 | memcpy(rx->ccm_gcm.pn, pn, IEEE80211_CCMP_PN_LEN); | |
00b9cfa3 JM |
770 | } |
771 | ||
00b9cfa3 | 772 | /* Remove GCMP header and MIC */ |
f980ebc0 | 773 | if (pskb_trim(skb, skb->len - mic_len)) |
00b9cfa3 JM |
774 | return RX_DROP_UNUSABLE; |
775 | memmove(skb->data + IEEE80211_GCMP_HDR_LEN, skb->data, hdrlen); | |
776 | skb_pull(skb, IEEE80211_GCMP_HDR_LEN); | |
777 | ||
778 | return RX_CONTINUE; | |
779 | } | |
780 | ||
765cb46a JM |
781 | static void bip_aad(struct sk_buff *skb, u8 *aad) |
782 | { | |
33766368 JM |
783 | __le16 mask_fc; |
784 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
785 | ||
765cb46a JM |
786 | /* BIP AAD: FC(masked) || A1 || A2 || A3 */ |
787 | ||
788 | /* FC type/subtype */ | |
765cb46a | 789 | /* Mask FC Retry, PwrMgt, MoreData flags to zero */ |
33766368 JM |
790 | mask_fc = hdr->frame_control; |
791 | mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | IEEE80211_FCTL_PM | | |
792 | IEEE80211_FCTL_MOREDATA); | |
793 | put_unaligned(mask_fc, (__le16 *) &aad[0]); | |
765cb46a | 794 | /* A1 || A2 || A3 */ |
2aec9099 | 795 | memcpy(aad + 2, &hdr->addrs, 3 * ETH_ALEN); |
765cb46a JM |
796 | } |
797 | ||
798 | ||
75396ae6 JB |
799 | static inline void bip_ipn_set64(u8 *d, u64 pn) |
800 | { | |
801 | *d++ = pn; | |
802 | *d++ = pn >> 8; | |
803 | *d++ = pn >> 16; | |
804 | *d++ = pn >> 24; | |
805 | *d++ = pn >> 32; | |
806 | *d = pn >> 40; | |
807 | } | |
808 | ||
765cb46a JM |
809 | static inline void bip_ipn_swap(u8 *d, const u8 *s) |
810 | { | |
811 | *d++ = s[5]; | |
812 | *d++ = s[4]; | |
813 | *d++ = s[3]; | |
814 | *d++ = s[2]; | |
815 | *d++ = s[1]; | |
816 | *d = s[0]; | |
817 | } | |
818 | ||
819 | ||
820 | ieee80211_tx_result | |
821 | ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx) | |
822 | { | |
252b86c4 JB |
823 | struct sk_buff *skb; |
824 | struct ieee80211_tx_info *info; | |
765cb46a JM |
825 | struct ieee80211_key *key = tx->key; |
826 | struct ieee80211_mmie *mmie; | |
75396ae6 JB |
827 | u8 aad[20]; |
828 | u64 pn64; | |
765cb46a | 829 | |
252b86c4 JB |
830 | if (WARN_ON(skb_queue_len(&tx->skbs) != 1)) |
831 | return TX_DROP; | |
832 | ||
833 | skb = skb_peek(&tx->skbs); | |
834 | ||
835 | info = IEEE80211_SKB_CB(skb); | |
836 | ||
a0b4496a LB |
837 | if (info->control.hw_key && |
838 | !(key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIE)) | |
252b86c4 | 839 | return TX_CONTINUE; |
765cb46a JM |
840 | |
841 | if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie))) | |
842 | return TX_DROP; | |
843 | ||
4df864c1 | 844 | mmie = skb_put(skb, sizeof(*mmie)); |
765cb46a JM |
845 | mmie->element_id = WLAN_EID_MMIE; |
846 | mmie->length = sizeof(*mmie) - 2; | |
847 | mmie->key_id = cpu_to_le16(key->conf.keyidx); | |
848 | ||
849 | /* PN = PN + 1 */ | |
db388a56 | 850 | pn64 = atomic64_inc_return(&key->conf.tx_pn); |
765cb46a | 851 | |
75396ae6 | 852 | bip_ipn_set64(mmie->sequence_number, pn64); |
765cb46a | 853 | |
a0b4496a LB |
854 | if (info->control.hw_key) |
855 | return TX_CONTINUE; | |
856 | ||
765cb46a JM |
857 | bip_aad(skb, aad); |
858 | ||
859 | /* | |
860 | * MIC = AES-128-CMAC(IGTK, AAD || Management Frame Body || MMIE, 64) | |
861 | */ | |
75396ae6 JB |
862 | ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad, |
863 | skb->data + 24, skb->len - 24, mmie->mic); | |
765cb46a JM |
864 | |
865 | return TX_CONTINUE; | |
866 | } | |
867 | ||
56c52da2 JM |
868 | ieee80211_tx_result |
869 | ieee80211_crypto_aes_cmac_256_encrypt(struct ieee80211_tx_data *tx) | |
870 | { | |
871 | struct sk_buff *skb; | |
872 | struct ieee80211_tx_info *info; | |
873 | struct ieee80211_key *key = tx->key; | |
874 | struct ieee80211_mmie_16 *mmie; | |
875 | u8 aad[20]; | |
876 | u64 pn64; | |
877 | ||
878 | if (WARN_ON(skb_queue_len(&tx->skbs) != 1)) | |
879 | return TX_DROP; | |
880 | ||
881 | skb = skb_peek(&tx->skbs); | |
882 | ||
883 | info = IEEE80211_SKB_CB(skb); | |
884 | ||
885 | if (info->control.hw_key) | |
886 | return TX_CONTINUE; | |
887 | ||
888 | if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie))) | |
889 | return TX_DROP; | |
890 | ||
4df864c1 | 891 | mmie = skb_put(skb, sizeof(*mmie)); |
56c52da2 JM |
892 | mmie->element_id = WLAN_EID_MMIE; |
893 | mmie->length = sizeof(*mmie) - 2; | |
894 | mmie->key_id = cpu_to_le16(key->conf.keyidx); | |
895 | ||
896 | /* PN = PN + 1 */ | |
db388a56 | 897 | pn64 = atomic64_inc_return(&key->conf.tx_pn); |
56c52da2 JM |
898 | |
899 | bip_ipn_set64(mmie->sequence_number, pn64); | |
900 | ||
901 | bip_aad(skb, aad); | |
902 | ||
903 | /* MIC = AES-256-CMAC(IGTK, AAD || Management Frame Body || MMIE, 128) | |
904 | */ | |
905 | ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad, | |
906 | skb->data + 24, skb->len - 24, mmie->mic); | |
907 | ||
908 | return TX_CONTINUE; | |
909 | } | |
765cb46a JM |
910 | |
911 | ieee80211_rx_result | |
912 | ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx) | |
913 | { | |
914 | struct sk_buff *skb = rx->skb; | |
eb9fb5b8 | 915 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
765cb46a JM |
916 | struct ieee80211_key *key = rx->key; |
917 | struct ieee80211_mmie *mmie; | |
918 | u8 aad[20], mic[8], ipn[6]; | |
919 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
920 | ||
921 | if (!ieee80211_is_mgmt(hdr->frame_control)) | |
922 | return RX_CONTINUE; | |
923 | ||
a8286911 JB |
924 | /* management frames are already linear */ |
925 | ||
765cb46a JM |
926 | if (skb->len < 24 + sizeof(*mmie)) |
927 | return RX_DROP_UNUSABLE; | |
928 | ||
929 | mmie = (struct ieee80211_mmie *) | |
930 | (skb->data + skb->len - sizeof(*mmie)); | |
931 | if (mmie->element_id != WLAN_EID_MMIE || | |
932 | mmie->length != sizeof(*mmie) - 2) | |
933 | return RX_DROP_UNUSABLE; /* Invalid MMIE */ | |
934 | ||
935 | bip_ipn_swap(ipn, mmie->sequence_number); | |
936 | ||
937 | if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) { | |
938 | key->u.aes_cmac.replays++; | |
939 | return RX_DROP_UNUSABLE; | |
940 | } | |
941 | ||
eb9fb5b8 | 942 | if (!(status->flag & RX_FLAG_DECRYPTED)) { |
765cb46a JM |
943 | /* hardware didn't decrypt/verify MIC */ |
944 | bip_aad(skb, aad); | |
75396ae6 | 945 | ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad, |
765cb46a | 946 | skb->data + 24, skb->len - 24, mic); |
98c67d18 | 947 | if (crypto_memneq(mic, mmie->mic, sizeof(mmie->mic))) { |
765cb46a JM |
948 | key->u.aes_cmac.icverrors++; |
949 | return RX_DROP_UNUSABLE; | |
950 | } | |
951 | } | |
952 | ||
953 | memcpy(key->u.aes_cmac.rx_pn, ipn, 6); | |
954 | ||
955 | /* Remove MMIE */ | |
956 | skb_trim(skb, skb->len - sizeof(*mmie)); | |
957 | ||
958 | return RX_CONTINUE; | |
959 | } | |
d32a1028 | 960 | |
56c52da2 JM |
961 | ieee80211_rx_result |
962 | ieee80211_crypto_aes_cmac_256_decrypt(struct ieee80211_rx_data *rx) | |
963 | { | |
964 | struct sk_buff *skb = rx->skb; | |
965 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
966 | struct ieee80211_key *key = rx->key; | |
967 | struct ieee80211_mmie_16 *mmie; | |
968 | u8 aad[20], mic[16], ipn[6]; | |
969 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
970 | ||
971 | if (!ieee80211_is_mgmt(hdr->frame_control)) | |
972 | return RX_CONTINUE; | |
973 | ||
974 | /* management frames are already linear */ | |
975 | ||
976 | if (skb->len < 24 + sizeof(*mmie)) | |
977 | return RX_DROP_UNUSABLE; | |
978 | ||
979 | mmie = (struct ieee80211_mmie_16 *) | |
980 | (skb->data + skb->len - sizeof(*mmie)); | |
981 | if (mmie->element_id != WLAN_EID_MMIE || | |
982 | mmie->length != sizeof(*mmie) - 2) | |
983 | return RX_DROP_UNUSABLE; /* Invalid MMIE */ | |
984 | ||
985 | bip_ipn_swap(ipn, mmie->sequence_number); | |
986 | ||
987 | if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) { | |
988 | key->u.aes_cmac.replays++; | |
989 | return RX_DROP_UNUSABLE; | |
990 | } | |
991 | ||
992 | if (!(status->flag & RX_FLAG_DECRYPTED)) { | |
993 | /* hardware didn't decrypt/verify MIC */ | |
994 | bip_aad(skb, aad); | |
995 | ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad, | |
996 | skb->data + 24, skb->len - 24, mic); | |
98c67d18 | 997 | if (crypto_memneq(mic, mmie->mic, sizeof(mmie->mic))) { |
56c52da2 JM |
998 | key->u.aes_cmac.icverrors++; |
999 | return RX_DROP_UNUSABLE; | |
1000 | } | |
1001 | } | |
1002 | ||
1003 | memcpy(key->u.aes_cmac.rx_pn, ipn, 6); | |
1004 | ||
1005 | /* Remove MMIE */ | |
1006 | skb_trim(skb, skb->len - sizeof(*mmie)); | |
1007 | ||
1008 | return RX_CONTINUE; | |
1009 | } | |
1010 | ||
8ade538b JM |
1011 | ieee80211_tx_result |
1012 | ieee80211_crypto_aes_gmac_encrypt(struct ieee80211_tx_data *tx) | |
1013 | { | |
1014 | struct sk_buff *skb; | |
1015 | struct ieee80211_tx_info *info; | |
1016 | struct ieee80211_key *key = tx->key; | |
1017 | struct ieee80211_mmie_16 *mmie; | |
1018 | struct ieee80211_hdr *hdr; | |
f4a067f9 | 1019 | u8 aad[GMAC_AAD_LEN]; |
8ade538b | 1020 | u64 pn64; |
f4a067f9 | 1021 | u8 nonce[GMAC_NONCE_LEN]; |
8ade538b JM |
1022 | |
1023 | if (WARN_ON(skb_queue_len(&tx->skbs) != 1)) | |
1024 | return TX_DROP; | |
1025 | ||
1026 | skb = skb_peek(&tx->skbs); | |
1027 | ||
1028 | info = IEEE80211_SKB_CB(skb); | |
1029 | ||
1030 | if (info->control.hw_key) | |
1031 | return TX_CONTINUE; | |
1032 | ||
1033 | if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie))) | |
1034 | return TX_DROP; | |
1035 | ||
4df864c1 | 1036 | mmie = skb_put(skb, sizeof(*mmie)); |
8ade538b JM |
1037 | mmie->element_id = WLAN_EID_MMIE; |
1038 | mmie->length = sizeof(*mmie) - 2; | |
1039 | mmie->key_id = cpu_to_le16(key->conf.keyidx); | |
1040 | ||
1041 | /* PN = PN + 1 */ | |
db388a56 | 1042 | pn64 = atomic64_inc_return(&key->conf.tx_pn); |
8ade538b JM |
1043 | |
1044 | bip_ipn_set64(mmie->sequence_number, pn64); | |
1045 | ||
1046 | bip_aad(skb, aad); | |
1047 | ||
1048 | hdr = (struct ieee80211_hdr *)skb->data; | |
1049 | memcpy(nonce, hdr->addr2, ETH_ALEN); | |
1050 | bip_ipn_swap(nonce + ETH_ALEN, mmie->sequence_number); | |
1051 | ||
1052 | /* MIC = AES-GMAC(IGTK, AAD || Management Frame Body || MMIE, 128) */ | |
1053 | if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce, | |
1054 | skb->data + 24, skb->len - 24, mmie->mic) < 0) | |
1055 | return TX_DROP; | |
1056 | ||
1057 | return TX_CONTINUE; | |
1058 | } | |
1059 | ||
1060 | ieee80211_rx_result | |
1061 | ieee80211_crypto_aes_gmac_decrypt(struct ieee80211_rx_data *rx) | |
1062 | { | |
1063 | struct sk_buff *skb = rx->skb; | |
1064 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1065 | struct ieee80211_key *key = rx->key; | |
1066 | struct ieee80211_mmie_16 *mmie; | |
a71fd9da | 1067 | u8 aad[GMAC_AAD_LEN], *mic, ipn[6], nonce[GMAC_NONCE_LEN]; |
8ade538b JM |
1068 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
1069 | ||
1070 | if (!ieee80211_is_mgmt(hdr->frame_control)) | |
1071 | return RX_CONTINUE; | |
1072 | ||
1073 | /* management frames are already linear */ | |
1074 | ||
1075 | if (skb->len < 24 + sizeof(*mmie)) | |
1076 | return RX_DROP_UNUSABLE; | |
1077 | ||
1078 | mmie = (struct ieee80211_mmie_16 *) | |
1079 | (skb->data + skb->len - sizeof(*mmie)); | |
1080 | if (mmie->element_id != WLAN_EID_MMIE || | |
1081 | mmie->length != sizeof(*mmie) - 2) | |
1082 | return RX_DROP_UNUSABLE; /* Invalid MMIE */ | |
1083 | ||
1084 | bip_ipn_swap(ipn, mmie->sequence_number); | |
1085 | ||
1086 | if (memcmp(ipn, key->u.aes_gmac.rx_pn, 6) <= 0) { | |
1087 | key->u.aes_gmac.replays++; | |
1088 | return RX_DROP_UNUSABLE; | |
1089 | } | |
1090 | ||
1091 | if (!(status->flag & RX_FLAG_DECRYPTED)) { | |
1092 | /* hardware didn't decrypt/verify MIC */ | |
1093 | bip_aad(skb, aad); | |
1094 | ||
1095 | memcpy(nonce, hdr->addr2, ETH_ALEN); | |
1096 | memcpy(nonce + ETH_ALEN, ipn, 6); | |
1097 | ||
a71fd9da JM |
1098 | mic = kmalloc(GMAC_MIC_LEN, GFP_ATOMIC); |
1099 | if (!mic) | |
1100 | return RX_DROP_UNUSABLE; | |
8ade538b JM |
1101 | if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce, |
1102 | skb->data + 24, skb->len - 24, | |
1103 | mic) < 0 || | |
98c67d18 | 1104 | crypto_memneq(mic, mmie->mic, sizeof(mmie->mic))) { |
8ade538b | 1105 | key->u.aes_gmac.icverrors++; |
a71fd9da | 1106 | kfree(mic); |
8ade538b JM |
1107 | return RX_DROP_UNUSABLE; |
1108 | } | |
a71fd9da | 1109 | kfree(mic); |
8ade538b JM |
1110 | } |
1111 | ||
1112 | memcpy(key->u.aes_gmac.rx_pn, ipn, 6); | |
1113 | ||
1114 | /* Remove MMIE */ | |
1115 | skb_trim(skb, skb->len - sizeof(*mmie)); | |
1116 | ||
1117 | return RX_CONTINUE; | |
1118 | } |