Commit | Line | Data |
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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 |
f0706e82 JB |
6 | */ |
7 | ||
8 | #include <linux/netdevice.h> | |
9 | #include <linux/types.h> | |
f0706e82 JB |
10 | #include <linux/skbuff.h> |
11 | #include <linux/compiler.h> | |
f14df804 | 12 | #include <linux/ieee80211.h> |
5a0e3ad6 | 13 | #include <linux/gfp.h> |
f14df804 | 14 | #include <asm/unaligned.h> |
f0706e82 | 15 | #include <net/mac80211.h> |
aba83a0b | 16 | #include <crypto/aes.h> |
98c67d18 | 17 | #include <crypto/algapi.h> |
eb063c17 | 18 | |
f0706e82 JB |
19 | #include "ieee80211_i.h" |
20 | #include "michael.h" | |
21 | #include "tkip.h" | |
22 | #include "aes_ccm.h" | |
765cb46a | 23 | #include "aes_cmac.h" |
8ade538b | 24 | #include "aes_gmac.h" |
00b9cfa3 | 25 | #include "aes_gcm.h" |
f0706e82 JB |
26 | #include "wpa.h" |
27 | ||
9ae54c84 | 28 | ieee80211_tx_result |
5cf121c3 | 29 | ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx) |
f0706e82 | 30 | { |
747d753d | 31 | u8 *data, *key, *mic; |
f0706e82 | 32 | size_t data_len; |
8e8862b7 HH |
33 | unsigned int hdrlen; |
34 | struct ieee80211_hdr *hdr; | |
f0706e82 | 35 | struct sk_buff *skb = tx->skb; |
813d7669 | 36 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
23c0752a | 37 | int tail; |
f0706e82 | 38 | |
c34498b9 | 39 | hdr = (struct ieee80211_hdr *)skb->data; |
97359d12 JB |
40 | if (!tx->key || tx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP || |
41 | skb->len < 24 || !ieee80211_is_data_present(hdr->frame_control)) | |
9ae54c84 | 42 | return TX_CONTINUE; |
f0706e82 | 43 | |
8e8862b7 HH |
44 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
45 | if (skb->len < hdrlen) | |
9ae54c84 | 46 | return TX_DROP; |
f0706e82 | 47 | |
8e8862b7 HH |
48 | data = skb->data + hdrlen; |
49 | data_len = skb->len - hdrlen; | |
50 | ||
681d1190 JM |
51 | if (unlikely(info->flags & IEEE80211_TX_INTFL_TKIP_MIC_FAILURE)) { |
52 | /* Need to use software crypto for the test */ | |
53 | info->control.hw_key = NULL; | |
54 | } | |
55 | ||
813d7669 | 56 | if (info->control.hw_key && |
a26eb27a | 57 | (info->flags & IEEE80211_TX_CTL_DONTFRAG || |
f3fe4e93 | 58 | ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) && |
9de18d81 DS |
59 | !(tx->key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC | |
60 | IEEE80211_KEY_FLAG_PUT_MIC_SPACE))) { | |
61 | /* hwaccel - with no need for SW-generated MMIC or MIC space */ | |
9ae54c84 | 62 | return TX_CONTINUE; |
f0706e82 JB |
63 | } |
64 | ||
23c0752a | 65 | tail = MICHAEL_MIC_LEN; |
813d7669 | 66 | if (!info->control.hw_key) |
4325f6ca | 67 | tail += IEEE80211_TKIP_ICV_LEN; |
23c0752a | 68 | |
b1e9be87 JB |
69 | if (WARN(skb_tailroom(skb) < tail || |
70 | skb_headroom(skb) < IEEE80211_TKIP_IV_LEN, | |
71 | "mmic: not enough head/tail (%d/%d,%d/%d)\n", | |
72 | skb_headroom(skb), IEEE80211_TKIP_IV_LEN, | |
73 | skb_tailroom(skb), tail)) | |
23c0752a | 74 | return TX_DROP; |
f0706e82 | 75 | |
f0706e82 | 76 | mic = skb_put(skb, MICHAEL_MIC_LEN); |
9de18d81 DS |
77 | |
78 | if (tx->key->conf.flags & IEEE80211_KEY_FLAG_PUT_MIC_SPACE) { | |
79 | /* Zeroed MIC can help with debug */ | |
80 | memset(mic, 0, MICHAEL_MIC_LEN); | |
81 | return TX_CONTINUE; | |
82 | } | |
83 | ||
84 | key = &tx->key->conf.key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY]; | |
8e8862b7 | 85 | michael_mic(key, hdr, data, data_len, mic); |
681d1190 JM |
86 | if (unlikely(info->flags & IEEE80211_TX_INTFL_TKIP_MIC_FAILURE)) |
87 | mic[0]++; | |
f0706e82 | 88 | |
9ae54c84 | 89 | return TX_CONTINUE; |
f0706e82 JB |
90 | } |
91 | ||
92 | ||
9ae54c84 | 93 | ieee80211_rx_result |
5cf121c3 | 94 | ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx) |
f0706e82 | 95 | { |
747d753d | 96 | u8 *data, *key = NULL; |
f0706e82 | 97 | size_t data_len; |
8e8862b7 | 98 | unsigned int hdrlen; |
f0706e82 JB |
99 | u8 mic[MICHAEL_MIC_LEN]; |
100 | struct sk_buff *skb = rx->skb; | |
eb9fb5b8 JB |
101 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
102 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
f0706e82 | 103 | |
816c04fe CL |
104 | /* |
105 | * it makes no sense to check for MIC errors on anything other | |
106 | * than data frames. | |
107 | */ | |
108 | if (!ieee80211_is_data_present(hdr->frame_control)) | |
9ae54c84 | 109 | return RX_CONTINUE; |
f0706e82 | 110 | |
816c04fe CL |
111 | /* |
112 | * No way to verify the MIC if the hardware stripped it or | |
113 | * the IV with the key index. In this case we have solely rely | |
114 | * on the driver to set RX_FLAG_MMIC_ERROR in the event of a | |
115 | * MIC failure report. | |
116 | */ | |
117 | if (status->flag & (RX_FLAG_MMIC_STRIPPED | RX_FLAG_IV_STRIPPED)) { | |
118 | if (status->flag & RX_FLAG_MMIC_ERROR) | |
b98ea058 | 119 | goto mic_fail_no_key; |
816c04fe | 120 | |
4045f72b SG |
121 | if (!(status->flag & RX_FLAG_IV_STRIPPED) && rx->key && |
122 | rx->key->conf.cipher == WLAN_CIPHER_SUITE_TKIP) | |
816c04fe CL |
123 | goto update_iv; |
124 | ||
125 | return RX_CONTINUE; | |
126 | } | |
127 | ||
128 | /* | |
129 | * Some hardware seems to generate Michael MIC failure reports; even | |
130 | * though, the frame was not encrypted with TKIP and therefore has no | |
131 | * MIC. Ignore the flag them to avoid triggering countermeasures. | |
132 | */ | |
97359d12 | 133 | if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP || |
816c04fe | 134 | !(status->flag & RX_FLAG_DECRYPTED)) |
9ae54c84 | 135 | return RX_CONTINUE; |
f0706e82 | 136 | |
816c04fe CL |
137 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP && rx->key->conf.keyidx) { |
138 | /* | |
139 | * APs with pairwise keys should never receive Michael MIC | |
140 | * errors for non-zero keyidx because these are reserved for | |
141 | * group keys and only the AP is sending real multicast | |
87ee475e | 142 | * frames in the BSS. |
816c04fe CL |
143 | */ |
144 | return RX_DROP_UNUSABLE; | |
145 | } | |
146 | ||
147 | if (status->flag & RX_FLAG_MMIC_ERROR) | |
148 | goto mic_fail; | |
149 | ||
8e8862b7 HH |
150 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
151 | if (skb->len < hdrlen + MICHAEL_MIC_LEN) | |
e4c26add | 152 | return RX_DROP_UNUSABLE; |
f0706e82 | 153 | |
a8286911 JB |
154 | if (skb_linearize(rx->skb)) |
155 | return RX_DROP_UNUSABLE; | |
156 | hdr = (void *)skb->data; | |
157 | ||
8e8862b7 HH |
158 | data = skb->data + hdrlen; |
159 | data_len = skb->len - hdrlen - MICHAEL_MIC_LEN; | |
747d753d | 160 | key = &rx->key->conf.key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY]; |
8e8862b7 | 161 | michael_mic(key, hdr, data, data_len, mic); |
98c67d18 | 162 | if (crypto_memneq(mic, data + data_len, MICHAEL_MIC_LEN)) |
816c04fe | 163 | goto mic_fail; |
f0706e82 | 164 | |
f0706e82 JB |
165 | /* remove Michael MIC from payload */ |
166 | skb_trim(skb, skb->len - MICHAEL_MIC_LEN); | |
167 | ||
816c04fe | 168 | update_iv: |
50741ae0 | 169 | /* update IV in key information to be able to detect replays */ |
9e26297a JB |
170 | rx->key->u.tkip.rx[rx->security_idx].iv32 = rx->tkip_iv32; |
171 | rx->key->u.tkip.rx[rx->security_idx].iv16 = rx->tkip_iv16; | |
50741ae0 | 172 | |
9ae54c84 | 173 | return RX_CONTINUE; |
816c04fe CL |
174 | |
175 | mic_fail: | |
b98ea058 S |
176 | rx->key->u.tkip.mic_failures++; |
177 | ||
178 | mic_fail_no_key: | |
a66b98db AN |
179 | /* |
180 | * In some cases the key can be unset - e.g. a multicast packet, in | |
181 | * a driver that supports HW encryption. Send up the key idx only if | |
182 | * the key is set. | |
183 | */ | |
6f1f5d5f JB |
184 | cfg80211_michael_mic_failure(rx->sdata->dev, hdr->addr2, |
185 | is_multicast_ether_addr(hdr->addr1) ? | |
186 | NL80211_KEYTYPE_GROUP : | |
187 | NL80211_KEYTYPE_PAIRWISE, | |
188 | rx->key ? rx->key->conf.keyidx : -1, | |
189 | NULL, GFP_ATOMIC); | |
816c04fe | 190 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
191 | } |
192 | ||
e039fa4a | 193 | static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb) |
f0706e82 JB |
194 | { |
195 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
196 | struct ieee80211_key *key = tx->key; | |
e039fa4a | 197 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
d5184cac HH |
198 | unsigned int hdrlen; |
199 | int len, tail; | |
f8079d43 | 200 | u64 pn; |
f0706e82 JB |
201 | u8 *pos; |
202 | ||
813d7669 | 203 | if (info->control.hw_key && |
ee70108f JD |
204 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) && |
205 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) { | |
813d7669 | 206 | /* hwaccel - with no need for software-generated IV */ |
23c0752a | 207 | return 0; |
e039fa4a JB |
208 | } |
209 | ||
d5184cac | 210 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 JB |
211 | len = skb->len - hdrlen; |
212 | ||
813d7669 | 213 | if (info->control.hw_key) |
23c0752a | 214 | tail = 0; |
11a843b7 | 215 | else |
4325f6ca | 216 | tail = IEEE80211_TKIP_ICV_LEN; |
23c0752a JB |
217 | |
218 | if (WARN_ON(skb_tailroom(skb) < tail || | |
4325f6ca | 219 | skb_headroom(skb) < IEEE80211_TKIP_IV_LEN)) |
23c0752a | 220 | return -1; |
f0706e82 | 221 | |
4325f6ca JB |
222 | pos = skb_push(skb, IEEE80211_TKIP_IV_LEN); |
223 | memmove(pos, pos + IEEE80211_TKIP_IV_LEN, hdrlen); | |
f0706e82 JB |
224 | pos += hdrlen; |
225 | ||
ee70108f JD |
226 | /* the HW only needs room for the IV, but not the actual IV */ |
227 | if (info->control.hw_key && | |
228 | (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) | |
229 | return 0; | |
230 | ||
f0706e82 | 231 | /* Increase IV for the frame */ |
f8079d43 EP |
232 | pn = atomic64_inc_return(&key->conf.tx_pn); |
233 | pos = ieee80211_tkip_add_iv(pos, &key->conf, pn); | |
f0706e82 | 234 | |
813d7669 JB |
235 | /* hwaccel - with software IV */ |
236 | if (info->control.hw_key) | |
f0706e82 | 237 | return 0; |
f0706e82 JB |
238 | |
239 | /* Add room for ICV */ | |
4325f6ca | 240 | skb_put(skb, IEEE80211_TKIP_ICV_LEN); |
f0706e82 | 241 | |
5fdb3735 | 242 | return ieee80211_tkip_encrypt_data(&tx->local->wep_tx_ctx, |
523b02ea | 243 | key, skb, pos, len); |
f0706e82 JB |
244 | } |
245 | ||
246 | ||
9ae54c84 | 247 | ieee80211_tx_result |
5cf121c3 | 248 | ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx) |
f0706e82 | 249 | { |
252b86c4 | 250 | struct sk_buff *skb; |
f0706e82 | 251 | |
5cf121c3 | 252 | ieee80211_tx_set_protected(tx); |
f0706e82 | 253 | |
252b86c4 | 254 | skb_queue_walk(&tx->skbs, skb) { |
2de8e0d9 JB |
255 | if (tkip_encrypt_skb(tx, skb) < 0) |
256 | return TX_DROP; | |
252b86c4 | 257 | } |
f0706e82 | 258 | |
9ae54c84 | 259 | return TX_CONTINUE; |
f0706e82 JB |
260 | } |
261 | ||
262 | ||
9ae54c84 | 263 | ieee80211_rx_result |
5cf121c3 | 264 | ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx) |
f0706e82 JB |
265 | { |
266 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; | |
747d753d | 267 | int hdrlen, res, hwaccel = 0; |
f0706e82 JB |
268 | struct ieee80211_key *key = rx->key; |
269 | struct sk_buff *skb = rx->skb; | |
eb9fb5b8 | 270 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
f0706e82 | 271 | |
d5184cac | 272 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 | 273 | |
c34498b9 | 274 | if (!ieee80211_is_data(hdr->frame_control)) |
9ae54c84 | 275 | return RX_CONTINUE; |
f0706e82 JB |
276 | |
277 | if (!rx->sta || skb->len - hdrlen < 12) | |
e4c26add | 278 | return RX_DROP_UNUSABLE; |
f0706e82 | 279 | |
a8286911 JB |
280 | /* it may be possible to optimize this a bit more */ |
281 | if (skb_linearize(rx->skb)) | |
282 | return RX_DROP_UNUSABLE; | |
283 | hdr = (void *)skb->data; | |
284 | ||
dc1580dd JB |
285 | /* |
286 | * Let TKIP code verify IV, but skip decryption. | |
287 | * In the case where hardware checks the IV as well, | |
288 | * we don't even get here, see ieee80211_rx_h_decrypt() | |
289 | */ | |
290 | if (status->flag & RX_FLAG_DECRYPTED) | |
f0706e82 | 291 | hwaccel = 1; |
f0706e82 | 292 | |
5fdb3735 | 293 | res = ieee80211_tkip_decrypt_data(&rx->local->wep_rx_ctx, |
f0706e82 | 294 | key, skb->data + hdrlen, |
17741cdc | 295 | skb->len - hdrlen, rx->sta->sta.addr, |
9e26297a | 296 | hdr->addr1, hwaccel, rx->security_idx, |
5cf121c3 JB |
297 | &rx->tkip_iv32, |
298 | &rx->tkip_iv16); | |
747d753d | 299 | if (res != TKIP_DECRYPT_OK) |
e4c26add | 300 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
301 | |
302 | /* Trim ICV */ | |
cef0acd4 DS |
303 | if (!(status->flag & RX_FLAG_ICV_STRIPPED)) |
304 | skb_trim(skb, skb->len - IEEE80211_TKIP_ICV_LEN); | |
f0706e82 JB |
305 | |
306 | /* Remove IV */ | |
4325f6ca JB |
307 | memmove(skb->data + IEEE80211_TKIP_IV_LEN, skb->data, hdrlen); |
308 | skb_pull(skb, IEEE80211_TKIP_IV_LEN); | |
f0706e82 | 309 | |
9ae54c84 | 310 | return RX_CONTINUE; |
f0706e82 JB |
311 | } |
312 | ||
313 | ||
30ef7ef9 | 314 | static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad) |
f0706e82 | 315 | { |
f14df804 | 316 | __le16 mask_fc; |
fb733336 | 317 | int a4_included, mgmt; |
f14df804 | 318 | u8 qos_tid; |
7ec7c4a9 | 319 | u16 len_a; |
f14df804 HH |
320 | unsigned int hdrlen; |
321 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
f0706e82 | 322 | |
f14df804 | 323 | /* |
fb733336 | 324 | * Mask FC: zero subtype b4 b5 b6 (if not mgmt) |
f14df804 HH |
325 | * Retry, PwrMgt, MoreData; set Protected |
326 | */ | |
fb733336 | 327 | mgmt = ieee80211_is_mgmt(hdr->frame_control); |
f14df804 | 328 | mask_fc = hdr->frame_control; |
fb733336 | 329 | mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | |
f14df804 | 330 | IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA); |
fb733336 JM |
331 | if (!mgmt) |
332 | mask_fc &= ~cpu_to_le16(0x0070); | |
f14df804 HH |
333 | mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); |
334 | ||
335 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
336 | len_a = hdrlen - 2; | |
337 | a4_included = ieee80211_has_a4(hdr->frame_control); | |
f0706e82 | 338 | |
f14df804 | 339 | if (ieee80211_is_data_qos(hdr->frame_control)) |
a1f2ba04 | 340 | qos_tid = ieee80211_get_tid(hdr); |
f14df804 HH |
341 | else |
342 | qos_tid = 0; | |
343 | ||
7ec7c4a9 AB |
344 | /* In CCM, the initial vectors (IV) used for CTR mode encryption and CBC |
345 | * mode authentication are not allowed to collide, yet both are derived | |
346 | * from this vector b_0. We only set L := 1 here to indicate that the | |
347 | * data size can be represented in (L+1) bytes. The CCM layer will take | |
348 | * care of storing the data length in the top (L+1) bytes and setting | |
349 | * and clearing the other bits as is required to derive the two IVs. | |
350 | */ | |
351 | b_0[0] = 0x1; | |
f14df804 | 352 | |
fb733336 JM |
353 | /* Nonce: Nonce Flags | A2 | PN |
354 | * Nonce Flags: Priority (b0..b3) | Management (b4) | Reserved (b5..b7) | |
355 | */ | |
356 | b_0[1] = qos_tid | (mgmt << 4); | |
73e1f7c8 | 357 | memcpy(&b_0[2], hdr->addr2, ETH_ALEN); |
4325f6ca | 358 | memcpy(&b_0[8], pn, IEEE80211_CCMP_PN_LEN); |
f0706e82 JB |
359 | |
360 | /* AAD (extra authenticate-only data) / masked 802.11 header | |
361 | * FC | A1 | A2 | A3 | SC | [A4] | [QC] */ | |
f14df804 HH |
362 | put_unaligned_be16(len_a, &aad[0]); |
363 | put_unaligned(mask_fc, (__le16 *)&aad[2]); | |
73e1f7c8 | 364 | memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN); |
f0706e82 JB |
365 | |
366 | /* Mask Seq#, leave Frag# */ | |
367 | aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f; | |
368 | aad[23] = 0; | |
f14df804 | 369 | |
f0706e82 | 370 | if (a4_included) { |
73e1f7c8 | 371 | memcpy(&aad[24], hdr->addr4, ETH_ALEN); |
f14df804 | 372 | aad[30] = qos_tid; |
f0706e82 | 373 | aad[31] = 0; |
f14df804 | 374 | } else { |
73e1f7c8 | 375 | memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN); |
f14df804 | 376 | aad[24] = qos_tid; |
f0706e82 JB |
377 | } |
378 | } | |
379 | ||
380 | ||
381 | static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn, int key_id) | |
382 | { | |
383 | hdr[0] = pn[5]; | |
384 | hdr[1] = pn[4]; | |
385 | hdr[2] = 0; | |
386 | hdr[3] = 0x20 | (key_id << 6); | |
387 | hdr[4] = pn[3]; | |
388 | hdr[5] = pn[2]; | |
389 | hdr[6] = pn[1]; | |
390 | hdr[7] = pn[0]; | |
391 | } | |
392 | ||
393 | ||
c6a1fa12 | 394 | static inline void ccmp_hdr2pn(u8 *pn, u8 *hdr) |
f0706e82 JB |
395 | { |
396 | pn[0] = hdr[7]; | |
397 | pn[1] = hdr[6]; | |
398 | pn[2] = hdr[5]; | |
399 | pn[3] = hdr[4]; | |
400 | pn[4] = hdr[1]; | |
401 | pn[5] = hdr[0]; | |
f0706e82 JB |
402 | } |
403 | ||
404 | ||
2b2ba0db JM |
405 | static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb, |
406 | unsigned int mic_len) | |
f0706e82 JB |
407 | { |
408 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
409 | struct ieee80211_key *key = tx->key; | |
e039fa4a | 410 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
23c0752a | 411 | int hdrlen, len, tail; |
aba83a0b JB |
412 | u8 *pos; |
413 | u8 pn[6]; | |
414 | u64 pn64; | |
f4a067f9 | 415 | u8 aad[CCM_AAD_LEN]; |
7ec7c4a9 | 416 | u8 b_0[AES_BLOCK_SIZE]; |
f0706e82 | 417 | |
813d7669 | 418 | if (info->control.hw_key && |
077a9154 | 419 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) && |
17d38fa8 MK |
420 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) && |
421 | !((info->control.hw_key->flags & | |
422 | IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) && | |
423 | ieee80211_is_mgmt(hdr->frame_control))) { | |
813d7669 JB |
424 | /* |
425 | * hwaccel has no need for preallocated room for CCMP | |
426 | * header or MIC fields | |
427 | */ | |
23c0752a | 428 | return 0; |
e039fa4a JB |
429 | } |
430 | ||
d5184cac | 431 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 JB |
432 | len = skb->len - hdrlen; |
433 | ||
813d7669 | 434 | if (info->control.hw_key) |
23c0752a | 435 | tail = 0; |
11a843b7 | 436 | else |
2b2ba0db | 437 | tail = mic_len; |
23c0752a JB |
438 | |
439 | if (WARN_ON(skb_tailroom(skb) < tail || | |
4325f6ca | 440 | skb_headroom(skb) < IEEE80211_CCMP_HDR_LEN)) |
23c0752a | 441 | return -1; |
f0706e82 | 442 | |
4325f6ca JB |
443 | pos = skb_push(skb, IEEE80211_CCMP_HDR_LEN); |
444 | memmove(pos, pos + IEEE80211_CCMP_HDR_LEN, hdrlen); | |
077a9154 AN |
445 | |
446 | /* the HW only needs room for the IV, but not the actual IV */ | |
e0830f71 AN |
447 | if (info->control.hw_key && |
448 | (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) | |
077a9154 AN |
449 | return 0; |
450 | ||
f0706e82 JB |
451 | hdr = (struct ieee80211_hdr *) pos; |
452 | pos += hdrlen; | |
453 | ||
db388a56 | 454 | pn64 = atomic64_inc_return(&key->conf.tx_pn); |
f0706e82 | 455 | |
aba83a0b JB |
456 | pn[5] = pn64; |
457 | pn[4] = pn64 >> 8; | |
458 | pn[3] = pn64 >> 16; | |
459 | pn[2] = pn64 >> 24; | |
460 | pn[1] = pn64 >> 32; | |
461 | pn[0] = pn64 >> 40; | |
f0706e82 | 462 | |
8f20fc24 | 463 | ccmp_pn2hdr(pos, pn, key->conf.keyidx); |
f0706e82 | 464 | |
813d7669 JB |
465 | /* hwaccel - with software CCMP header */ |
466 | if (info->control.hw_key) | |
f0706e82 | 467 | return 0; |
f0706e82 | 468 | |
4325f6ca | 469 | pos += IEEE80211_CCMP_HDR_LEN; |
30ef7ef9 | 470 | ccmp_special_blocks(skb, pn, b_0, aad); |
f4a067f9 | 471 | return ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, b_0, aad, pos, len, |
4133da73 | 472 | skb_put(skb, mic_len)); |
f0706e82 JB |
473 | } |
474 | ||
475 | ||
9ae54c84 | 476 | ieee80211_tx_result |
2b2ba0db JM |
477 | ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx, |
478 | unsigned int mic_len) | |
f0706e82 | 479 | { |
252b86c4 | 480 | struct sk_buff *skb; |
f0706e82 | 481 | |
5cf121c3 | 482 | ieee80211_tx_set_protected(tx); |
f0706e82 | 483 | |
252b86c4 | 484 | skb_queue_walk(&tx->skbs, skb) { |
2b2ba0db | 485 | if (ccmp_encrypt_skb(tx, skb, mic_len) < 0) |
2de8e0d9 | 486 | return TX_DROP; |
252b86c4 | 487 | } |
f0706e82 | 488 | |
9ae54c84 | 489 | return TX_CONTINUE; |
f0706e82 JB |
490 | } |
491 | ||
492 | ||
9ae54c84 | 493 | ieee80211_rx_result |
2b2ba0db JM |
494 | ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx, |
495 | unsigned int mic_len) | |
f0706e82 | 496 | { |
c34498b9 | 497 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
f0706e82 JB |
498 | int hdrlen; |
499 | struct ieee80211_key *key = rx->key; | |
500 | struct sk_buff *skb = rx->skb; | |
eb9fb5b8 | 501 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
4325f6ca | 502 | u8 pn[IEEE80211_CCMP_PN_LEN]; |
f0706e82 | 503 | int data_len; |
9190252c | 504 | int queue; |
f0706e82 | 505 | |
d5184cac | 506 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 | 507 | |
fb733336 | 508 | if (!ieee80211_is_data(hdr->frame_control) && |
d8ca16db | 509 | !ieee80211_is_robust_mgmt_frame(skb)) |
9ae54c84 | 510 | return RX_CONTINUE; |
f0706e82 | 511 | |
a8286911 | 512 | if (status->flag & RX_FLAG_DECRYPTED) { |
4325f6ca | 513 | if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_CCMP_HDR_LEN)) |
a8286911 | 514 | return RX_DROP_UNUSABLE; |
f980ebc0 SS |
515 | if (status->flag & RX_FLAG_MIC_STRIPPED) |
516 | mic_len = 0; | |
a8286911 JB |
517 | } else { |
518 | if (skb_linearize(rx->skb)) | |
519 | return RX_DROP_UNUSABLE; | |
520 | } | |
521 | ||
f980ebc0 SS |
522 | data_len = skb->len - hdrlen - IEEE80211_CCMP_HDR_LEN - mic_len; |
523 | if (!rx->sta || data_len < 0) | |
524 | return RX_DROP_UNUSABLE; | |
525 | ||
981d94a8 | 526 | if (!(status->flag & RX_FLAG_PN_VALIDATED)) { |
f631a77b SS |
527 | int res; |
528 | ||
981d94a8 | 529 | ccmp_hdr2pn(pn, skb->data + hdrlen); |
f0706e82 | 530 | |
981d94a8 | 531 | queue = rx->security_idx; |
9190252c | 532 | |
f631a77b SS |
533 | res = memcmp(pn, key->u.ccmp.rx_pn[queue], |
534 | IEEE80211_CCMP_PN_LEN); | |
535 | if (res < 0 || | |
536 | (!res && !(status->flag & RX_FLAG_ALLOW_SAME_PN))) { | |
981d94a8 | 537 | key->u.ccmp.replays++; |
e4c26add | 538 | return RX_DROP_UNUSABLE; |
981d94a8 JB |
539 | } |
540 | ||
541 | if (!(status->flag & RX_FLAG_DECRYPTED)) { | |
542 | u8 aad[2 * AES_BLOCK_SIZE]; | |
543 | u8 b_0[AES_BLOCK_SIZE]; | |
544 | /* hardware didn't decrypt/verify MIC */ | |
545 | ccmp_special_blocks(skb, pn, b_0, aad); | |
546 | ||
547 | if (ieee80211_aes_ccm_decrypt( | |
548 | key->u.ccmp.tfm, b_0, aad, | |
549 | skb->data + hdrlen + IEEE80211_CCMP_HDR_LEN, | |
550 | data_len, | |
4133da73 | 551 | skb->data + skb->len - mic_len)) |
981d94a8 JB |
552 | return RX_DROP_UNUSABLE; |
553 | } | |
554 | ||
555 | memcpy(key->u.ccmp.rx_pn[queue], pn, IEEE80211_CCMP_PN_LEN); | |
f0706e82 JB |
556 | } |
557 | ||
f0706e82 | 558 | /* Remove CCMP header and MIC */ |
2b2ba0db | 559 | if (pskb_trim(skb, skb->len - mic_len)) |
a8286911 | 560 | return RX_DROP_UNUSABLE; |
4325f6ca JB |
561 | memmove(skb->data + IEEE80211_CCMP_HDR_LEN, skb->data, hdrlen); |
562 | skb_pull(skb, IEEE80211_CCMP_HDR_LEN); | |
f0706e82 | 563 | |
9ae54c84 | 564 | return RX_CONTINUE; |
f0706e82 | 565 | } |
765cb46a | 566 | |
00b9cfa3 JM |
567 | static void gcmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *j_0, u8 *aad) |
568 | { | |
569 | __le16 mask_fc; | |
570 | u8 qos_tid; | |
571 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
572 | ||
573 | memcpy(j_0, hdr->addr2, ETH_ALEN); | |
574 | memcpy(&j_0[ETH_ALEN], pn, IEEE80211_GCMP_PN_LEN); | |
575 | j_0[13] = 0; | |
576 | j_0[14] = 0; | |
577 | j_0[AES_BLOCK_SIZE - 1] = 0x01; | |
578 | ||
579 | /* AAD (extra authenticate-only data) / masked 802.11 header | |
580 | * FC | A1 | A2 | A3 | SC | [A4] | [QC] | |
581 | */ | |
582 | put_unaligned_be16(ieee80211_hdrlen(hdr->frame_control) - 2, &aad[0]); | |
583 | /* Mask FC: zero subtype b4 b5 b6 (if not mgmt) | |
584 | * Retry, PwrMgt, MoreData; set Protected | |
585 | */ | |
586 | mask_fc = hdr->frame_control; | |
587 | mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | | |
588 | IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA); | |
589 | if (!ieee80211_is_mgmt(hdr->frame_control)) | |
590 | mask_fc &= ~cpu_to_le16(0x0070); | |
591 | mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); | |
592 | ||
593 | put_unaligned(mask_fc, (__le16 *)&aad[2]); | |
594 | memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN); | |
595 | ||
596 | /* Mask Seq#, leave Frag# */ | |
597 | aad[22] = *((u8 *)&hdr->seq_ctrl) & 0x0f; | |
598 | aad[23] = 0; | |
599 | ||
600 | if (ieee80211_is_data_qos(hdr->frame_control)) | |
a1f2ba04 | 601 | qos_tid = ieee80211_get_tid(hdr); |
00b9cfa3 JM |
602 | else |
603 | qos_tid = 0; | |
604 | ||
605 | if (ieee80211_has_a4(hdr->frame_control)) { | |
606 | memcpy(&aad[24], hdr->addr4, ETH_ALEN); | |
607 | aad[30] = qos_tid; | |
608 | aad[31] = 0; | |
609 | } else { | |
610 | memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN); | |
611 | aad[24] = qos_tid; | |
612 | } | |
613 | } | |
614 | ||
615 | static inline void gcmp_pn2hdr(u8 *hdr, const u8 *pn, int key_id) | |
616 | { | |
617 | hdr[0] = pn[5]; | |
618 | hdr[1] = pn[4]; | |
619 | hdr[2] = 0; | |
620 | hdr[3] = 0x20 | (key_id << 6); | |
621 | hdr[4] = pn[3]; | |
622 | hdr[5] = pn[2]; | |
623 | hdr[6] = pn[1]; | |
624 | hdr[7] = pn[0]; | |
625 | } | |
626 | ||
627 | static inline void gcmp_hdr2pn(u8 *pn, const u8 *hdr) | |
628 | { | |
629 | pn[0] = hdr[7]; | |
630 | pn[1] = hdr[6]; | |
631 | pn[2] = hdr[5]; | |
632 | pn[3] = hdr[4]; | |
633 | pn[4] = hdr[1]; | |
634 | pn[5] = hdr[0]; | |
635 | } | |
636 | ||
637 | static int gcmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb) | |
638 | { | |
639 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
640 | struct ieee80211_key *key = tx->key; | |
641 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
642 | int hdrlen, len, tail; | |
643 | u8 *pos; | |
644 | u8 pn[6]; | |
645 | u64 pn64; | |
f4a067f9 | 646 | u8 aad[GCM_AAD_LEN]; |
00b9cfa3 JM |
647 | u8 j_0[AES_BLOCK_SIZE]; |
648 | ||
649 | if (info->control.hw_key && | |
650 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) && | |
651 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) && | |
652 | !((info->control.hw_key->flags & | |
653 | IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) && | |
654 | ieee80211_is_mgmt(hdr->frame_control))) { | |
655 | /* hwaccel has no need for preallocated room for GCMP | |
656 | * header or MIC fields | |
657 | */ | |
658 | return 0; | |
659 | } | |
660 | ||
661 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
662 | len = skb->len - hdrlen; | |
663 | ||
664 | if (info->control.hw_key) | |
665 | tail = 0; | |
666 | else | |
667 | tail = IEEE80211_GCMP_MIC_LEN; | |
668 | ||
669 | if (WARN_ON(skb_tailroom(skb) < tail || | |
670 | skb_headroom(skb) < IEEE80211_GCMP_HDR_LEN)) | |
671 | return -1; | |
672 | ||
673 | pos = skb_push(skb, IEEE80211_GCMP_HDR_LEN); | |
674 | memmove(pos, pos + IEEE80211_GCMP_HDR_LEN, hdrlen); | |
675 | skb_set_network_header(skb, skb_network_offset(skb) + | |
676 | IEEE80211_GCMP_HDR_LEN); | |
677 | ||
678 | /* the HW only needs room for the IV, but not the actual IV */ | |
679 | if (info->control.hw_key && | |
680 | (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) | |
681 | return 0; | |
682 | ||
683 | hdr = (struct ieee80211_hdr *)pos; | |
684 | pos += hdrlen; | |
685 | ||
db388a56 | 686 | pn64 = atomic64_inc_return(&key->conf.tx_pn); |
00b9cfa3 JM |
687 | |
688 | pn[5] = pn64; | |
689 | pn[4] = pn64 >> 8; | |
690 | pn[3] = pn64 >> 16; | |
691 | pn[2] = pn64 >> 24; | |
692 | pn[1] = pn64 >> 32; | |
693 | pn[0] = pn64 >> 40; | |
694 | ||
695 | gcmp_pn2hdr(pos, pn, key->conf.keyidx); | |
696 | ||
697 | /* hwaccel - with software GCMP header */ | |
698 | if (info->control.hw_key) | |
699 | return 0; | |
700 | ||
701 | pos += IEEE80211_GCMP_HDR_LEN; | |
702 | gcmp_special_blocks(skb, pn, j_0, aad); | |
f4a067f9 AB |
703 | return ieee80211_aes_gcm_encrypt(key->u.gcmp.tfm, j_0, aad, pos, len, |
704 | skb_put(skb, IEEE80211_GCMP_MIC_LEN)); | |
00b9cfa3 JM |
705 | } |
706 | ||
707 | ieee80211_tx_result | |
708 | ieee80211_crypto_gcmp_encrypt(struct ieee80211_tx_data *tx) | |
709 | { | |
710 | struct sk_buff *skb; | |
711 | ||
712 | ieee80211_tx_set_protected(tx); | |
713 | ||
714 | skb_queue_walk(&tx->skbs, skb) { | |
715 | if (gcmp_encrypt_skb(tx, skb) < 0) | |
716 | return TX_DROP; | |
717 | } | |
718 | ||
719 | return TX_CONTINUE; | |
720 | } | |
721 | ||
722 | ieee80211_rx_result | |
723 | ieee80211_crypto_gcmp_decrypt(struct ieee80211_rx_data *rx) | |
724 | { | |
725 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; | |
726 | int hdrlen; | |
727 | struct ieee80211_key *key = rx->key; | |
728 | struct sk_buff *skb = rx->skb; | |
729 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
730 | u8 pn[IEEE80211_GCMP_PN_LEN]; | |
f980ebc0 | 731 | int data_len, queue, mic_len = IEEE80211_GCMP_MIC_LEN; |
00b9cfa3 JM |
732 | |
733 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
734 | ||
735 | if (!ieee80211_is_data(hdr->frame_control) && | |
736 | !ieee80211_is_robust_mgmt_frame(skb)) | |
737 | return RX_CONTINUE; | |
738 | ||
00b9cfa3 JM |
739 | if (status->flag & RX_FLAG_DECRYPTED) { |
740 | if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_GCMP_HDR_LEN)) | |
741 | return RX_DROP_UNUSABLE; | |
f980ebc0 SS |
742 | if (status->flag & RX_FLAG_MIC_STRIPPED) |
743 | mic_len = 0; | |
00b9cfa3 JM |
744 | } else { |
745 | if (skb_linearize(rx->skb)) | |
746 | return RX_DROP_UNUSABLE; | |
747 | } | |
748 | ||
f980ebc0 SS |
749 | data_len = skb->len - hdrlen - IEEE80211_GCMP_HDR_LEN - mic_len; |
750 | if (!rx->sta || data_len < 0) | |
751 | return RX_DROP_UNUSABLE; | |
752 | ||
981d94a8 | 753 | if (!(status->flag & RX_FLAG_PN_VALIDATED)) { |
f631a77b SS |
754 | int res; |
755 | ||
981d94a8 | 756 | gcmp_hdr2pn(pn, skb->data + hdrlen); |
00b9cfa3 | 757 | |
981d94a8 | 758 | queue = rx->security_idx; |
00b9cfa3 | 759 | |
f631a77b SS |
760 | res = memcmp(pn, key->u.gcmp.rx_pn[queue], |
761 | IEEE80211_GCMP_PN_LEN); | |
762 | if (res < 0 || | |
763 | (!res && !(status->flag & RX_FLAG_ALLOW_SAME_PN))) { | |
981d94a8 | 764 | key->u.gcmp.replays++; |
00b9cfa3 | 765 | return RX_DROP_UNUSABLE; |
981d94a8 JB |
766 | } |
767 | ||
768 | if (!(status->flag & RX_FLAG_DECRYPTED)) { | |
769 | u8 aad[2 * AES_BLOCK_SIZE]; | |
770 | u8 j_0[AES_BLOCK_SIZE]; | |
771 | /* hardware didn't decrypt/verify MIC */ | |
772 | gcmp_special_blocks(skb, pn, j_0, aad); | |
773 | ||
774 | if (ieee80211_aes_gcm_decrypt( | |
775 | key->u.gcmp.tfm, j_0, aad, | |
776 | skb->data + hdrlen + IEEE80211_GCMP_HDR_LEN, | |
777 | data_len, | |
778 | skb->data + skb->len - | |
779 | IEEE80211_GCMP_MIC_LEN)) | |
780 | return RX_DROP_UNUSABLE; | |
781 | } | |
782 | ||
783 | memcpy(key->u.gcmp.rx_pn[queue], pn, IEEE80211_GCMP_PN_LEN); | |
00b9cfa3 JM |
784 | } |
785 | ||
00b9cfa3 | 786 | /* Remove GCMP header and MIC */ |
f980ebc0 | 787 | if (pskb_trim(skb, skb->len - mic_len)) |
00b9cfa3 JM |
788 | return RX_DROP_UNUSABLE; |
789 | memmove(skb->data + IEEE80211_GCMP_HDR_LEN, skb->data, hdrlen); | |
790 | skb_pull(skb, IEEE80211_GCMP_HDR_LEN); | |
791 | ||
792 | return RX_CONTINUE; | |
793 | } | |
794 | ||
2475b1cc MS |
795 | static ieee80211_tx_result |
796 | ieee80211_crypto_cs_encrypt(struct ieee80211_tx_data *tx, | |
797 | struct sk_buff *skb) | |
798 | { | |
799 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
800 | struct ieee80211_key *key = tx->key; | |
801 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
2475b1cc | 802 | int hdrlen; |
c7ef38e0 | 803 | u8 *pos, iv_len = key->conf.iv_len; |
2475b1cc MS |
804 | |
805 | if (info->control.hw_key && | |
806 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) { | |
807 | /* hwaccel has no need for preallocated head room */ | |
808 | return TX_CONTINUE; | |
809 | } | |
810 | ||
c7ef38e0 CI |
811 | if (unlikely(skb_headroom(skb) < iv_len && |
812 | pskb_expand_head(skb, iv_len, 0, GFP_ATOMIC))) | |
2475b1cc MS |
813 | return TX_DROP; |
814 | ||
815 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
816 | ||
c7ef38e0 CI |
817 | pos = skb_push(skb, iv_len); |
818 | memmove(pos, pos + iv_len, hdrlen); | |
2475b1cc MS |
819 | |
820 | return TX_CONTINUE; | |
821 | } | |
822 | ||
823 | static inline int ieee80211_crypto_cs_pn_compare(u8 *pn1, u8 *pn2, int len) | |
824 | { | |
825 | int i; | |
826 | ||
827 | /* pn is little endian */ | |
828 | for (i = len - 1; i >= 0; i--) { | |
829 | if (pn1[i] < pn2[i]) | |
830 | return -1; | |
831 | else if (pn1[i] > pn2[i]) | |
832 | return 1; | |
833 | } | |
834 | ||
835 | return 0; | |
836 | } | |
837 | ||
838 | static ieee80211_rx_result | |
839 | ieee80211_crypto_cs_decrypt(struct ieee80211_rx_data *rx) | |
840 | { | |
841 | struct ieee80211_key *key = rx->key; | |
842 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; | |
843 | const struct ieee80211_cipher_scheme *cs = NULL; | |
844 | int hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
845 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); | |
846 | int data_len; | |
847 | u8 *rx_pn; | |
848 | u8 *skb_pn; | |
849 | u8 qos_tid; | |
850 | ||
851 | if (!rx->sta || !rx->sta->cipher_scheme || | |
852 | !(status->flag & RX_FLAG_DECRYPTED)) | |
853 | return RX_DROP_UNUSABLE; | |
854 | ||
855 | if (!ieee80211_is_data(hdr->frame_control)) | |
856 | return RX_CONTINUE; | |
857 | ||
858 | cs = rx->sta->cipher_scheme; | |
859 | ||
860 | data_len = rx->skb->len - hdrlen - cs->hdr_len; | |
861 | ||
862 | if (data_len < 0) | |
863 | return RX_DROP_UNUSABLE; | |
864 | ||
865 | if (ieee80211_is_data_qos(hdr->frame_control)) | |
a1f2ba04 | 866 | qos_tid = ieee80211_get_tid(hdr); |
2475b1cc MS |
867 | else |
868 | qos_tid = 0; | |
869 | ||
870 | if (skb_linearize(rx->skb)) | |
871 | return RX_DROP_UNUSABLE; | |
872 | ||
873 | hdr = (struct ieee80211_hdr *)rx->skb->data; | |
874 | ||
875 | rx_pn = key->u.gen.rx_pn[qos_tid]; | |
876 | skb_pn = rx->skb->data + hdrlen + cs->pn_off; | |
877 | ||
878 | if (ieee80211_crypto_cs_pn_compare(skb_pn, rx_pn, cs->pn_len) <= 0) | |
879 | return RX_DROP_UNUSABLE; | |
880 | ||
881 | memcpy(rx_pn, skb_pn, cs->pn_len); | |
882 | ||
883 | /* remove security header and MIC */ | |
884 | if (pskb_trim(rx->skb, rx->skb->len - cs->mic_len)) | |
885 | return RX_DROP_UNUSABLE; | |
886 | ||
887 | memmove(rx->skb->data + cs->hdr_len, rx->skb->data, hdrlen); | |
888 | skb_pull(rx->skb, cs->hdr_len); | |
889 | ||
890 | return RX_CONTINUE; | |
891 | } | |
765cb46a JM |
892 | |
893 | static void bip_aad(struct sk_buff *skb, u8 *aad) | |
894 | { | |
33766368 JM |
895 | __le16 mask_fc; |
896 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
897 | ||
765cb46a JM |
898 | /* BIP AAD: FC(masked) || A1 || A2 || A3 */ |
899 | ||
900 | /* FC type/subtype */ | |
765cb46a | 901 | /* Mask FC Retry, PwrMgt, MoreData flags to zero */ |
33766368 JM |
902 | mask_fc = hdr->frame_control; |
903 | mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | IEEE80211_FCTL_PM | | |
904 | IEEE80211_FCTL_MOREDATA); | |
905 | put_unaligned(mask_fc, (__le16 *) &aad[0]); | |
765cb46a | 906 | /* A1 || A2 || A3 */ |
33766368 | 907 | memcpy(aad + 2, &hdr->addr1, 3 * ETH_ALEN); |
765cb46a JM |
908 | } |
909 | ||
910 | ||
75396ae6 JB |
911 | static inline void bip_ipn_set64(u8 *d, u64 pn) |
912 | { | |
913 | *d++ = pn; | |
914 | *d++ = pn >> 8; | |
915 | *d++ = pn >> 16; | |
916 | *d++ = pn >> 24; | |
917 | *d++ = pn >> 32; | |
918 | *d = pn >> 40; | |
919 | } | |
920 | ||
765cb46a JM |
921 | static inline void bip_ipn_swap(u8 *d, const u8 *s) |
922 | { | |
923 | *d++ = s[5]; | |
924 | *d++ = s[4]; | |
925 | *d++ = s[3]; | |
926 | *d++ = s[2]; | |
927 | *d++ = s[1]; | |
928 | *d = s[0]; | |
929 | } | |
930 | ||
931 | ||
932 | ieee80211_tx_result | |
933 | ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx) | |
934 | { | |
252b86c4 JB |
935 | struct sk_buff *skb; |
936 | struct ieee80211_tx_info *info; | |
765cb46a JM |
937 | struct ieee80211_key *key = tx->key; |
938 | struct ieee80211_mmie *mmie; | |
75396ae6 JB |
939 | u8 aad[20]; |
940 | u64 pn64; | |
765cb46a | 941 | |
252b86c4 JB |
942 | if (WARN_ON(skb_queue_len(&tx->skbs) != 1)) |
943 | return TX_DROP; | |
944 | ||
945 | skb = skb_peek(&tx->skbs); | |
946 | ||
947 | info = IEEE80211_SKB_CB(skb); | |
948 | ||
a0b4496a LB |
949 | if (info->control.hw_key && |
950 | !(key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIE)) | |
252b86c4 | 951 | return TX_CONTINUE; |
765cb46a JM |
952 | |
953 | if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie))) | |
954 | return TX_DROP; | |
955 | ||
4df864c1 | 956 | mmie = skb_put(skb, sizeof(*mmie)); |
765cb46a JM |
957 | mmie->element_id = WLAN_EID_MMIE; |
958 | mmie->length = sizeof(*mmie) - 2; | |
959 | mmie->key_id = cpu_to_le16(key->conf.keyidx); | |
960 | ||
961 | /* PN = PN + 1 */ | |
db388a56 | 962 | pn64 = atomic64_inc_return(&key->conf.tx_pn); |
765cb46a | 963 | |
75396ae6 | 964 | bip_ipn_set64(mmie->sequence_number, pn64); |
765cb46a | 965 | |
a0b4496a LB |
966 | if (info->control.hw_key) |
967 | return TX_CONTINUE; | |
968 | ||
765cb46a JM |
969 | bip_aad(skb, aad); |
970 | ||
971 | /* | |
972 | * MIC = AES-128-CMAC(IGTK, AAD || Management Frame Body || MMIE, 64) | |
973 | */ | |
75396ae6 JB |
974 | ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad, |
975 | skb->data + 24, skb->len - 24, mmie->mic); | |
765cb46a JM |
976 | |
977 | return TX_CONTINUE; | |
978 | } | |
979 | ||
56c52da2 JM |
980 | ieee80211_tx_result |
981 | ieee80211_crypto_aes_cmac_256_encrypt(struct ieee80211_tx_data *tx) | |
982 | { | |
983 | struct sk_buff *skb; | |
984 | struct ieee80211_tx_info *info; | |
985 | struct ieee80211_key *key = tx->key; | |
986 | struct ieee80211_mmie_16 *mmie; | |
987 | u8 aad[20]; | |
988 | u64 pn64; | |
989 | ||
990 | if (WARN_ON(skb_queue_len(&tx->skbs) != 1)) | |
991 | return TX_DROP; | |
992 | ||
993 | skb = skb_peek(&tx->skbs); | |
994 | ||
995 | info = IEEE80211_SKB_CB(skb); | |
996 | ||
997 | if (info->control.hw_key) | |
998 | return TX_CONTINUE; | |
999 | ||
1000 | if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie))) | |
1001 | return TX_DROP; | |
1002 | ||
4df864c1 | 1003 | mmie = skb_put(skb, sizeof(*mmie)); |
56c52da2 JM |
1004 | mmie->element_id = WLAN_EID_MMIE; |
1005 | mmie->length = sizeof(*mmie) - 2; | |
1006 | mmie->key_id = cpu_to_le16(key->conf.keyidx); | |
1007 | ||
1008 | /* PN = PN + 1 */ | |
db388a56 | 1009 | pn64 = atomic64_inc_return(&key->conf.tx_pn); |
56c52da2 JM |
1010 | |
1011 | bip_ipn_set64(mmie->sequence_number, pn64); | |
1012 | ||
1013 | bip_aad(skb, aad); | |
1014 | ||
1015 | /* MIC = AES-256-CMAC(IGTK, AAD || Management Frame Body || MMIE, 128) | |
1016 | */ | |
1017 | ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad, | |
1018 | skb->data + 24, skb->len - 24, mmie->mic); | |
1019 | ||
1020 | return TX_CONTINUE; | |
1021 | } | |
765cb46a JM |
1022 | |
1023 | ieee80211_rx_result | |
1024 | ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx) | |
1025 | { | |
1026 | struct sk_buff *skb = rx->skb; | |
eb9fb5b8 | 1027 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
765cb46a JM |
1028 | struct ieee80211_key *key = rx->key; |
1029 | struct ieee80211_mmie *mmie; | |
1030 | u8 aad[20], mic[8], ipn[6]; | |
1031 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
1032 | ||
1033 | if (!ieee80211_is_mgmt(hdr->frame_control)) | |
1034 | return RX_CONTINUE; | |
1035 | ||
a8286911 JB |
1036 | /* management frames are already linear */ |
1037 | ||
765cb46a JM |
1038 | if (skb->len < 24 + sizeof(*mmie)) |
1039 | return RX_DROP_UNUSABLE; | |
1040 | ||
1041 | mmie = (struct ieee80211_mmie *) | |
1042 | (skb->data + skb->len - sizeof(*mmie)); | |
1043 | if (mmie->element_id != WLAN_EID_MMIE || | |
1044 | mmie->length != sizeof(*mmie) - 2) | |
1045 | return RX_DROP_UNUSABLE; /* Invalid MMIE */ | |
1046 | ||
1047 | bip_ipn_swap(ipn, mmie->sequence_number); | |
1048 | ||
1049 | if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) { | |
1050 | key->u.aes_cmac.replays++; | |
1051 | return RX_DROP_UNUSABLE; | |
1052 | } | |
1053 | ||
eb9fb5b8 | 1054 | if (!(status->flag & RX_FLAG_DECRYPTED)) { |
765cb46a JM |
1055 | /* hardware didn't decrypt/verify MIC */ |
1056 | bip_aad(skb, aad); | |
75396ae6 | 1057 | ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad, |
765cb46a | 1058 | skb->data + 24, skb->len - 24, mic); |
98c67d18 | 1059 | if (crypto_memneq(mic, mmie->mic, sizeof(mmie->mic))) { |
765cb46a JM |
1060 | key->u.aes_cmac.icverrors++; |
1061 | return RX_DROP_UNUSABLE; | |
1062 | } | |
1063 | } | |
1064 | ||
1065 | memcpy(key->u.aes_cmac.rx_pn, ipn, 6); | |
1066 | ||
1067 | /* Remove MMIE */ | |
1068 | skb_trim(skb, skb->len - sizeof(*mmie)); | |
1069 | ||
1070 | return RX_CONTINUE; | |
1071 | } | |
d32a1028 | 1072 | |
56c52da2 JM |
1073 | ieee80211_rx_result |
1074 | ieee80211_crypto_aes_cmac_256_decrypt(struct ieee80211_rx_data *rx) | |
1075 | { | |
1076 | struct sk_buff *skb = rx->skb; | |
1077 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1078 | struct ieee80211_key *key = rx->key; | |
1079 | struct ieee80211_mmie_16 *mmie; | |
1080 | u8 aad[20], mic[16], ipn[6]; | |
1081 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
1082 | ||
1083 | if (!ieee80211_is_mgmt(hdr->frame_control)) | |
1084 | return RX_CONTINUE; | |
1085 | ||
1086 | /* management frames are already linear */ | |
1087 | ||
1088 | if (skb->len < 24 + sizeof(*mmie)) | |
1089 | return RX_DROP_UNUSABLE; | |
1090 | ||
1091 | mmie = (struct ieee80211_mmie_16 *) | |
1092 | (skb->data + skb->len - sizeof(*mmie)); | |
1093 | if (mmie->element_id != WLAN_EID_MMIE || | |
1094 | mmie->length != sizeof(*mmie) - 2) | |
1095 | return RX_DROP_UNUSABLE; /* Invalid MMIE */ | |
1096 | ||
1097 | bip_ipn_swap(ipn, mmie->sequence_number); | |
1098 | ||
1099 | if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) { | |
1100 | key->u.aes_cmac.replays++; | |
1101 | return RX_DROP_UNUSABLE; | |
1102 | } | |
1103 | ||
1104 | if (!(status->flag & RX_FLAG_DECRYPTED)) { | |
1105 | /* hardware didn't decrypt/verify MIC */ | |
1106 | bip_aad(skb, aad); | |
1107 | ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad, | |
1108 | skb->data + 24, skb->len - 24, mic); | |
98c67d18 | 1109 | if (crypto_memneq(mic, mmie->mic, sizeof(mmie->mic))) { |
56c52da2 JM |
1110 | key->u.aes_cmac.icverrors++; |
1111 | return RX_DROP_UNUSABLE; | |
1112 | } | |
1113 | } | |
1114 | ||
1115 | memcpy(key->u.aes_cmac.rx_pn, ipn, 6); | |
1116 | ||
1117 | /* Remove MMIE */ | |
1118 | skb_trim(skb, skb->len - sizeof(*mmie)); | |
1119 | ||
1120 | return RX_CONTINUE; | |
1121 | } | |
1122 | ||
8ade538b JM |
1123 | ieee80211_tx_result |
1124 | ieee80211_crypto_aes_gmac_encrypt(struct ieee80211_tx_data *tx) | |
1125 | { | |
1126 | struct sk_buff *skb; | |
1127 | struct ieee80211_tx_info *info; | |
1128 | struct ieee80211_key *key = tx->key; | |
1129 | struct ieee80211_mmie_16 *mmie; | |
1130 | struct ieee80211_hdr *hdr; | |
f4a067f9 | 1131 | u8 aad[GMAC_AAD_LEN]; |
8ade538b | 1132 | u64 pn64; |
f4a067f9 | 1133 | u8 nonce[GMAC_NONCE_LEN]; |
8ade538b JM |
1134 | |
1135 | if (WARN_ON(skb_queue_len(&tx->skbs) != 1)) | |
1136 | return TX_DROP; | |
1137 | ||
1138 | skb = skb_peek(&tx->skbs); | |
1139 | ||
1140 | info = IEEE80211_SKB_CB(skb); | |
1141 | ||
1142 | if (info->control.hw_key) | |
1143 | return TX_CONTINUE; | |
1144 | ||
1145 | if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie))) | |
1146 | return TX_DROP; | |
1147 | ||
4df864c1 | 1148 | mmie = skb_put(skb, sizeof(*mmie)); |
8ade538b JM |
1149 | mmie->element_id = WLAN_EID_MMIE; |
1150 | mmie->length = sizeof(*mmie) - 2; | |
1151 | mmie->key_id = cpu_to_le16(key->conf.keyidx); | |
1152 | ||
1153 | /* PN = PN + 1 */ | |
db388a56 | 1154 | pn64 = atomic64_inc_return(&key->conf.tx_pn); |
8ade538b JM |
1155 | |
1156 | bip_ipn_set64(mmie->sequence_number, pn64); | |
1157 | ||
1158 | bip_aad(skb, aad); | |
1159 | ||
1160 | hdr = (struct ieee80211_hdr *)skb->data; | |
1161 | memcpy(nonce, hdr->addr2, ETH_ALEN); | |
1162 | bip_ipn_swap(nonce + ETH_ALEN, mmie->sequence_number); | |
1163 | ||
1164 | /* MIC = AES-GMAC(IGTK, AAD || Management Frame Body || MMIE, 128) */ | |
1165 | if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce, | |
1166 | skb->data + 24, skb->len - 24, mmie->mic) < 0) | |
1167 | return TX_DROP; | |
1168 | ||
1169 | return TX_CONTINUE; | |
1170 | } | |
1171 | ||
1172 | ieee80211_rx_result | |
1173 | ieee80211_crypto_aes_gmac_decrypt(struct ieee80211_rx_data *rx) | |
1174 | { | |
1175 | struct sk_buff *skb = rx->skb; | |
1176 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1177 | struct ieee80211_key *key = rx->key; | |
1178 | struct ieee80211_mmie_16 *mmie; | |
a71fd9da | 1179 | u8 aad[GMAC_AAD_LEN], *mic, ipn[6], nonce[GMAC_NONCE_LEN]; |
8ade538b JM |
1180 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
1181 | ||
1182 | if (!ieee80211_is_mgmt(hdr->frame_control)) | |
1183 | return RX_CONTINUE; | |
1184 | ||
1185 | /* management frames are already linear */ | |
1186 | ||
1187 | if (skb->len < 24 + sizeof(*mmie)) | |
1188 | return RX_DROP_UNUSABLE; | |
1189 | ||
1190 | mmie = (struct ieee80211_mmie_16 *) | |
1191 | (skb->data + skb->len - sizeof(*mmie)); | |
1192 | if (mmie->element_id != WLAN_EID_MMIE || | |
1193 | mmie->length != sizeof(*mmie) - 2) | |
1194 | return RX_DROP_UNUSABLE; /* Invalid MMIE */ | |
1195 | ||
1196 | bip_ipn_swap(ipn, mmie->sequence_number); | |
1197 | ||
1198 | if (memcmp(ipn, key->u.aes_gmac.rx_pn, 6) <= 0) { | |
1199 | key->u.aes_gmac.replays++; | |
1200 | return RX_DROP_UNUSABLE; | |
1201 | } | |
1202 | ||
1203 | if (!(status->flag & RX_FLAG_DECRYPTED)) { | |
1204 | /* hardware didn't decrypt/verify MIC */ | |
1205 | bip_aad(skb, aad); | |
1206 | ||
1207 | memcpy(nonce, hdr->addr2, ETH_ALEN); | |
1208 | memcpy(nonce + ETH_ALEN, ipn, 6); | |
1209 | ||
a71fd9da JM |
1210 | mic = kmalloc(GMAC_MIC_LEN, GFP_ATOMIC); |
1211 | if (!mic) | |
1212 | return RX_DROP_UNUSABLE; | |
8ade538b JM |
1213 | if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce, |
1214 | skb->data + 24, skb->len - 24, | |
1215 | mic) < 0 || | |
98c67d18 | 1216 | crypto_memneq(mic, mmie->mic, sizeof(mmie->mic))) { |
8ade538b | 1217 | key->u.aes_gmac.icverrors++; |
a71fd9da | 1218 | kfree(mic); |
8ade538b JM |
1219 | return RX_DROP_UNUSABLE; |
1220 | } | |
a71fd9da | 1221 | kfree(mic); |
8ade538b JM |
1222 | } |
1223 | ||
1224 | memcpy(key->u.aes_gmac.rx_pn, ipn, 6); | |
1225 | ||
1226 | /* Remove MMIE */ | |
1227 | skb_trim(skb, skb->len - sizeof(*mmie)); | |
1228 | ||
1229 | return RX_CONTINUE; | |
1230 | } | |
1231 | ||
d32a1028 YD |
1232 | ieee80211_tx_result |
1233 | ieee80211_crypto_hw_encrypt(struct ieee80211_tx_data *tx) | |
1234 | { | |
1235 | struct sk_buff *skb; | |
1236 | struct ieee80211_tx_info *info = NULL; | |
2475b1cc | 1237 | ieee80211_tx_result res; |
d32a1028 YD |
1238 | |
1239 | skb_queue_walk(&tx->skbs, skb) { | |
1240 | info = IEEE80211_SKB_CB(skb); | |
1241 | ||
1242 | /* handle hw-only algorithm */ | |
1243 | if (!info->control.hw_key) | |
1244 | return TX_DROP; | |
2475b1cc | 1245 | |
c7ef38e0 | 1246 | if (tx->key->flags & KEY_FLAG_CIPHER_SCHEME) { |
2475b1cc MS |
1247 | res = ieee80211_crypto_cs_encrypt(tx, skb); |
1248 | if (res != TX_CONTINUE) | |
1249 | return res; | |
1250 | } | |
d32a1028 YD |
1251 | } |
1252 | ||
1253 | ieee80211_tx_set_protected(tx); | |
1254 | ||
1255 | return TX_CONTINUE; | |
1256 | } | |
2475b1cc MS |
1257 | |
1258 | ieee80211_rx_result | |
1259 | ieee80211_crypto_hw_decrypt(struct ieee80211_rx_data *rx) | |
1260 | { | |
aeb136c5 | 1261 | if (rx->sta && rx->sta->cipher_scheme) |
2475b1cc MS |
1262 | return ieee80211_crypto_cs_decrypt(rx); |
1263 | ||
1264 | return RX_DROP_UNUSABLE; | |
1265 | } |