Commit | Line | Data |
---|---|---|
f0706e82 JB |
1 | /* |
2 | * Copyright 2002-2004, Instant802 Networks, Inc. | |
765cb46a | 3 | * Copyright 2008, Jouni Malinen <j@w1.fi> |
9de18d81 | 4 | * Copyright (C) 2016-2017 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> |
98c67d18 | 20 | #include <crypto/algapi.h> |
eb063c17 | 21 | |
f0706e82 JB |
22 | #include "ieee80211_i.h" |
23 | #include "michael.h" | |
24 | #include "tkip.h" | |
25 | #include "aes_ccm.h" | |
765cb46a | 26 | #include "aes_cmac.h" |
8ade538b | 27 | #include "aes_gmac.h" |
00b9cfa3 | 28 | #include "aes_gcm.h" |
f0706e82 JB |
29 | #include "wpa.h" |
30 | ||
9ae54c84 | 31 | ieee80211_tx_result |
5cf121c3 | 32 | ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx) |
f0706e82 | 33 | { |
747d753d | 34 | u8 *data, *key, *mic; |
f0706e82 | 35 | size_t data_len; |
8e8862b7 HH |
36 | unsigned int hdrlen; |
37 | struct ieee80211_hdr *hdr; | |
f0706e82 | 38 | struct sk_buff *skb = tx->skb; |
813d7669 | 39 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
23c0752a | 40 | int tail; |
f0706e82 | 41 | |
c34498b9 | 42 | hdr = (struct ieee80211_hdr *)skb->data; |
97359d12 JB |
43 | if (!tx->key || tx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP || |
44 | skb->len < 24 || !ieee80211_is_data_present(hdr->frame_control)) | |
9ae54c84 | 45 | return TX_CONTINUE; |
f0706e82 | 46 | |
8e8862b7 HH |
47 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
48 | if (skb->len < hdrlen) | |
9ae54c84 | 49 | return TX_DROP; |
f0706e82 | 50 | |
8e8862b7 HH |
51 | data = skb->data + hdrlen; |
52 | data_len = skb->len - hdrlen; | |
53 | ||
681d1190 JM |
54 | if (unlikely(info->flags & IEEE80211_TX_INTFL_TKIP_MIC_FAILURE)) { |
55 | /* Need to use software crypto for the test */ | |
56 | info->control.hw_key = NULL; | |
57 | } | |
58 | ||
813d7669 | 59 | if (info->control.hw_key && |
a26eb27a | 60 | (info->flags & IEEE80211_TX_CTL_DONTFRAG || |
f3fe4e93 | 61 | ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) && |
9de18d81 DS |
62 | !(tx->key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC | |
63 | IEEE80211_KEY_FLAG_PUT_MIC_SPACE))) { | |
64 | /* hwaccel - with no need for SW-generated MMIC or MIC space */ | |
9ae54c84 | 65 | return TX_CONTINUE; |
f0706e82 JB |
66 | } |
67 | ||
23c0752a | 68 | tail = MICHAEL_MIC_LEN; |
813d7669 | 69 | if (!info->control.hw_key) |
4325f6ca | 70 | tail += IEEE80211_TKIP_ICV_LEN; |
23c0752a | 71 | |
b1e9be87 JB |
72 | if (WARN(skb_tailroom(skb) < tail || |
73 | skb_headroom(skb) < IEEE80211_TKIP_IV_LEN, | |
74 | "mmic: not enough head/tail (%d/%d,%d/%d)\n", | |
75 | skb_headroom(skb), IEEE80211_TKIP_IV_LEN, | |
76 | skb_tailroom(skb), tail)) | |
23c0752a | 77 | return TX_DROP; |
f0706e82 | 78 | |
f0706e82 | 79 | mic = skb_put(skb, MICHAEL_MIC_LEN); |
9de18d81 DS |
80 | |
81 | if (tx->key->conf.flags & IEEE80211_KEY_FLAG_PUT_MIC_SPACE) { | |
82 | /* Zeroed MIC can help with debug */ | |
83 | memset(mic, 0, MICHAEL_MIC_LEN); | |
84 | return TX_CONTINUE; | |
85 | } | |
86 | ||
87 | key = &tx->key->conf.key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY]; | |
8e8862b7 | 88 | michael_mic(key, hdr, data, data_len, mic); |
681d1190 JM |
89 | if (unlikely(info->flags & IEEE80211_TX_INTFL_TKIP_MIC_FAILURE)) |
90 | mic[0]++; | |
f0706e82 | 91 | |
9ae54c84 | 92 | return TX_CONTINUE; |
f0706e82 JB |
93 | } |
94 | ||
95 | ||
9ae54c84 | 96 | ieee80211_rx_result |
5cf121c3 | 97 | ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx) |
f0706e82 | 98 | { |
747d753d | 99 | u8 *data, *key = NULL; |
f0706e82 | 100 | size_t data_len; |
8e8862b7 | 101 | unsigned int hdrlen; |
f0706e82 JB |
102 | u8 mic[MICHAEL_MIC_LEN]; |
103 | struct sk_buff *skb = rx->skb; | |
eb9fb5b8 JB |
104 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
105 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
f0706e82 | 106 | |
816c04fe CL |
107 | /* |
108 | * it makes no sense to check for MIC errors on anything other | |
109 | * than data frames. | |
110 | */ | |
111 | if (!ieee80211_is_data_present(hdr->frame_control)) | |
9ae54c84 | 112 | return RX_CONTINUE; |
f0706e82 | 113 | |
816c04fe CL |
114 | /* |
115 | * No way to verify the MIC if the hardware stripped it or | |
116 | * the IV with the key index. In this case we have solely rely | |
117 | * on the driver to set RX_FLAG_MMIC_ERROR in the event of a | |
118 | * MIC failure report. | |
119 | */ | |
120 | if (status->flag & (RX_FLAG_MMIC_STRIPPED | RX_FLAG_IV_STRIPPED)) { | |
121 | if (status->flag & RX_FLAG_MMIC_ERROR) | |
b98ea058 | 122 | goto mic_fail_no_key; |
816c04fe | 123 | |
4045f72b SG |
124 | if (!(status->flag & RX_FLAG_IV_STRIPPED) && rx->key && |
125 | rx->key->conf.cipher == WLAN_CIPHER_SUITE_TKIP) | |
816c04fe CL |
126 | goto update_iv; |
127 | ||
128 | return RX_CONTINUE; | |
129 | } | |
130 | ||
131 | /* | |
132 | * Some hardware seems to generate Michael MIC failure reports; even | |
133 | * though, the frame was not encrypted with TKIP and therefore has no | |
134 | * MIC. Ignore the flag them to avoid triggering countermeasures. | |
135 | */ | |
97359d12 | 136 | if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP || |
816c04fe | 137 | !(status->flag & RX_FLAG_DECRYPTED)) |
9ae54c84 | 138 | return RX_CONTINUE; |
f0706e82 | 139 | |
816c04fe CL |
140 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP && rx->key->conf.keyidx) { |
141 | /* | |
142 | * APs with pairwise keys should never receive Michael MIC | |
143 | * errors for non-zero keyidx because these are reserved for | |
144 | * group keys and only the AP is sending real multicast | |
87ee475e | 145 | * frames in the BSS. |
816c04fe CL |
146 | */ |
147 | return RX_DROP_UNUSABLE; | |
148 | } | |
149 | ||
150 | if (status->flag & RX_FLAG_MMIC_ERROR) | |
151 | goto mic_fail; | |
152 | ||
8e8862b7 HH |
153 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
154 | if (skb->len < hdrlen + MICHAEL_MIC_LEN) | |
e4c26add | 155 | return RX_DROP_UNUSABLE; |
f0706e82 | 156 | |
a8286911 JB |
157 | if (skb_linearize(rx->skb)) |
158 | return RX_DROP_UNUSABLE; | |
159 | hdr = (void *)skb->data; | |
160 | ||
8e8862b7 HH |
161 | data = skb->data + hdrlen; |
162 | data_len = skb->len - hdrlen - MICHAEL_MIC_LEN; | |
747d753d | 163 | key = &rx->key->conf.key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY]; |
8e8862b7 | 164 | michael_mic(key, hdr, data, data_len, mic); |
98c67d18 | 165 | if (crypto_memneq(mic, data + data_len, MICHAEL_MIC_LEN)) |
816c04fe | 166 | goto mic_fail; |
f0706e82 | 167 | |
f0706e82 JB |
168 | /* remove Michael MIC from payload */ |
169 | skb_trim(skb, skb->len - MICHAEL_MIC_LEN); | |
170 | ||
816c04fe | 171 | update_iv: |
50741ae0 | 172 | /* update IV in key information to be able to detect replays */ |
9e26297a JB |
173 | rx->key->u.tkip.rx[rx->security_idx].iv32 = rx->tkip_iv32; |
174 | rx->key->u.tkip.rx[rx->security_idx].iv16 = rx->tkip_iv16; | |
50741ae0 | 175 | |
9ae54c84 | 176 | return RX_CONTINUE; |
816c04fe CL |
177 | |
178 | mic_fail: | |
b98ea058 S |
179 | rx->key->u.tkip.mic_failures++; |
180 | ||
181 | mic_fail_no_key: | |
a66b98db AN |
182 | /* |
183 | * In some cases the key can be unset - e.g. a multicast packet, in | |
184 | * a driver that supports HW encryption. Send up the key idx only if | |
185 | * the key is set. | |
186 | */ | |
6f1f5d5f JB |
187 | cfg80211_michael_mic_failure(rx->sdata->dev, hdr->addr2, |
188 | is_multicast_ether_addr(hdr->addr1) ? | |
189 | NL80211_KEYTYPE_GROUP : | |
190 | NL80211_KEYTYPE_PAIRWISE, | |
191 | rx->key ? rx->key->conf.keyidx : -1, | |
192 | NULL, GFP_ATOMIC); | |
816c04fe | 193 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
194 | } |
195 | ||
e039fa4a | 196 | static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb) |
f0706e82 JB |
197 | { |
198 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
199 | struct ieee80211_key *key = tx->key; | |
e039fa4a | 200 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
d5184cac HH |
201 | unsigned int hdrlen; |
202 | int len, tail; | |
f8079d43 | 203 | u64 pn; |
f0706e82 JB |
204 | u8 *pos; |
205 | ||
813d7669 | 206 | if (info->control.hw_key && |
ee70108f JD |
207 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) && |
208 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) { | |
813d7669 | 209 | /* hwaccel - with no need for software-generated IV */ |
23c0752a | 210 | return 0; |
e039fa4a JB |
211 | } |
212 | ||
d5184cac | 213 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 JB |
214 | len = skb->len - hdrlen; |
215 | ||
813d7669 | 216 | if (info->control.hw_key) |
23c0752a | 217 | tail = 0; |
11a843b7 | 218 | else |
4325f6ca | 219 | tail = IEEE80211_TKIP_ICV_LEN; |
23c0752a JB |
220 | |
221 | if (WARN_ON(skb_tailroom(skb) < tail || | |
4325f6ca | 222 | skb_headroom(skb) < IEEE80211_TKIP_IV_LEN)) |
23c0752a | 223 | return -1; |
f0706e82 | 224 | |
4325f6ca JB |
225 | pos = skb_push(skb, IEEE80211_TKIP_IV_LEN); |
226 | memmove(pos, pos + IEEE80211_TKIP_IV_LEN, hdrlen); | |
f0706e82 JB |
227 | pos += hdrlen; |
228 | ||
ee70108f JD |
229 | /* the HW only needs room for the IV, but not the actual IV */ |
230 | if (info->control.hw_key && | |
231 | (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) | |
232 | return 0; | |
233 | ||
f0706e82 | 234 | /* Increase IV for the frame */ |
f8079d43 EP |
235 | pn = atomic64_inc_return(&key->conf.tx_pn); |
236 | pos = ieee80211_tkip_add_iv(pos, &key->conf, pn); | |
f0706e82 | 237 | |
813d7669 JB |
238 | /* hwaccel - with software IV */ |
239 | if (info->control.hw_key) | |
f0706e82 | 240 | return 0; |
f0706e82 JB |
241 | |
242 | /* Add room for ICV */ | |
4325f6ca | 243 | skb_put(skb, IEEE80211_TKIP_ICV_LEN); |
f0706e82 | 244 | |
3473187d | 245 | return ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm, |
523b02ea | 246 | key, skb, pos, len); |
f0706e82 JB |
247 | } |
248 | ||
249 | ||
9ae54c84 | 250 | ieee80211_tx_result |
5cf121c3 | 251 | ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx) |
f0706e82 | 252 | { |
252b86c4 | 253 | struct sk_buff *skb; |
f0706e82 | 254 | |
5cf121c3 | 255 | ieee80211_tx_set_protected(tx); |
f0706e82 | 256 | |
252b86c4 | 257 | skb_queue_walk(&tx->skbs, skb) { |
2de8e0d9 JB |
258 | if (tkip_encrypt_skb(tx, skb) < 0) |
259 | return TX_DROP; | |
252b86c4 | 260 | } |
f0706e82 | 261 | |
9ae54c84 | 262 | return TX_CONTINUE; |
f0706e82 JB |
263 | } |
264 | ||
265 | ||
9ae54c84 | 266 | ieee80211_rx_result |
5cf121c3 | 267 | ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx) |
f0706e82 JB |
268 | { |
269 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; | |
747d753d | 270 | int hdrlen, res, hwaccel = 0; |
f0706e82 JB |
271 | struct ieee80211_key *key = rx->key; |
272 | struct sk_buff *skb = rx->skb; | |
eb9fb5b8 | 273 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
f0706e82 | 274 | |
d5184cac | 275 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 | 276 | |
c34498b9 | 277 | if (!ieee80211_is_data(hdr->frame_control)) |
9ae54c84 | 278 | return RX_CONTINUE; |
f0706e82 JB |
279 | |
280 | if (!rx->sta || skb->len - hdrlen < 12) | |
e4c26add | 281 | return RX_DROP_UNUSABLE; |
f0706e82 | 282 | |
a8286911 JB |
283 | /* it may be possible to optimize this a bit more */ |
284 | if (skb_linearize(rx->skb)) | |
285 | return RX_DROP_UNUSABLE; | |
286 | hdr = (void *)skb->data; | |
287 | ||
dc1580dd JB |
288 | /* |
289 | * Let TKIP code verify IV, but skip decryption. | |
290 | * In the case where hardware checks the IV as well, | |
291 | * we don't even get here, see ieee80211_rx_h_decrypt() | |
292 | */ | |
293 | if (status->flag & RX_FLAG_DECRYPTED) | |
f0706e82 | 294 | hwaccel = 1; |
f0706e82 JB |
295 | |
296 | res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm, | |
297 | key, skb->data + hdrlen, | |
17741cdc | 298 | skb->len - hdrlen, rx->sta->sta.addr, |
9e26297a | 299 | hdr->addr1, hwaccel, rx->security_idx, |
5cf121c3 JB |
300 | &rx->tkip_iv32, |
301 | &rx->tkip_iv16); | |
747d753d | 302 | if (res != TKIP_DECRYPT_OK) |
e4c26add | 303 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
304 | |
305 | /* Trim ICV */ | |
cef0acd4 DS |
306 | if (!(status->flag & RX_FLAG_ICV_STRIPPED)) |
307 | skb_trim(skb, skb->len - IEEE80211_TKIP_ICV_LEN); | |
f0706e82 JB |
308 | |
309 | /* Remove IV */ | |
4325f6ca JB |
310 | memmove(skb->data + IEEE80211_TKIP_IV_LEN, skb->data, hdrlen); |
311 | skb_pull(skb, IEEE80211_TKIP_IV_LEN); | |
f0706e82 | 312 | |
9ae54c84 | 313 | return RX_CONTINUE; |
f0706e82 JB |
314 | } |
315 | ||
316 | ||
30ef7ef9 | 317 | static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad) |
f0706e82 | 318 | { |
f14df804 | 319 | __le16 mask_fc; |
fb733336 | 320 | int a4_included, mgmt; |
f14df804 | 321 | u8 qos_tid; |
7ec7c4a9 | 322 | u16 len_a; |
f14df804 HH |
323 | unsigned int hdrlen; |
324 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
f0706e82 | 325 | |
f14df804 | 326 | /* |
fb733336 | 327 | * Mask FC: zero subtype b4 b5 b6 (if not mgmt) |
f14df804 HH |
328 | * Retry, PwrMgt, MoreData; set Protected |
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 | ||
338 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
339 | len_a = hdrlen - 2; | |
340 | a4_included = ieee80211_has_a4(hdr->frame_control); | |
f0706e82 | 341 | |
f14df804 | 342 | if (ieee80211_is_data_qos(hdr->frame_control)) |
a1f2ba04 | 343 | qos_tid = ieee80211_get_tid(hdr); |
f14df804 HH |
344 | else |
345 | qos_tid = 0; | |
346 | ||
7ec7c4a9 AB |
347 | /* In CCM, the initial vectors (IV) used for CTR mode encryption and CBC |
348 | * mode authentication are not allowed to collide, yet both are derived | |
349 | * from this vector b_0. We only set L := 1 here to indicate that the | |
350 | * data size can be represented in (L+1) bytes. The CCM layer will take | |
351 | * care of storing the data length in the top (L+1) bytes and setting | |
352 | * and clearing the other bits as is required to derive the two IVs. | |
353 | */ | |
354 | b_0[0] = 0x1; | |
f14df804 | 355 | |
fb733336 JM |
356 | /* Nonce: Nonce Flags | A2 | PN |
357 | * Nonce Flags: Priority (b0..b3) | Management (b4) | Reserved (b5..b7) | |
358 | */ | |
359 | b_0[1] = qos_tid | (mgmt << 4); | |
73e1f7c8 | 360 | memcpy(&b_0[2], hdr->addr2, ETH_ALEN); |
4325f6ca | 361 | memcpy(&b_0[8], pn, IEEE80211_CCMP_PN_LEN); |
f0706e82 JB |
362 | |
363 | /* AAD (extra authenticate-only data) / masked 802.11 header | |
364 | * FC | A1 | A2 | A3 | SC | [A4] | [QC] */ | |
f14df804 HH |
365 | put_unaligned_be16(len_a, &aad[0]); |
366 | put_unaligned(mask_fc, (__le16 *)&aad[2]); | |
73e1f7c8 | 367 | memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN); |
f0706e82 JB |
368 | |
369 | /* Mask Seq#, leave Frag# */ | |
370 | aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f; | |
371 | aad[23] = 0; | |
f14df804 | 372 | |
f0706e82 | 373 | if (a4_included) { |
73e1f7c8 | 374 | memcpy(&aad[24], hdr->addr4, ETH_ALEN); |
f14df804 | 375 | aad[30] = qos_tid; |
f0706e82 | 376 | aad[31] = 0; |
f14df804 | 377 | } else { |
73e1f7c8 | 378 | memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN); |
f14df804 | 379 | aad[24] = qos_tid; |
f0706e82 JB |
380 | } |
381 | } | |
382 | ||
383 | ||
384 | static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn, int key_id) | |
385 | { | |
386 | hdr[0] = pn[5]; | |
387 | hdr[1] = pn[4]; | |
388 | hdr[2] = 0; | |
389 | hdr[3] = 0x20 | (key_id << 6); | |
390 | hdr[4] = pn[3]; | |
391 | hdr[5] = pn[2]; | |
392 | hdr[6] = pn[1]; | |
393 | hdr[7] = pn[0]; | |
394 | } | |
395 | ||
396 | ||
c6a1fa12 | 397 | static inline void ccmp_hdr2pn(u8 *pn, u8 *hdr) |
f0706e82 JB |
398 | { |
399 | pn[0] = hdr[7]; | |
400 | pn[1] = hdr[6]; | |
401 | pn[2] = hdr[5]; | |
402 | pn[3] = hdr[4]; | |
403 | pn[4] = hdr[1]; | |
404 | pn[5] = hdr[0]; | |
f0706e82 JB |
405 | } |
406 | ||
407 | ||
2b2ba0db JM |
408 | static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb, |
409 | unsigned int mic_len) | |
f0706e82 JB |
410 | { |
411 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
412 | struct ieee80211_key *key = tx->key; | |
e039fa4a | 413 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
23c0752a | 414 | int hdrlen, len, tail; |
aba83a0b JB |
415 | u8 *pos; |
416 | u8 pn[6]; | |
417 | u64 pn64; | |
f4a067f9 | 418 | u8 aad[CCM_AAD_LEN]; |
7ec7c4a9 | 419 | u8 b_0[AES_BLOCK_SIZE]; |
f0706e82 | 420 | |
813d7669 | 421 | if (info->control.hw_key && |
077a9154 | 422 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) && |
17d38fa8 MK |
423 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) && |
424 | !((info->control.hw_key->flags & | |
425 | IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) && | |
426 | ieee80211_is_mgmt(hdr->frame_control))) { | |
813d7669 JB |
427 | /* |
428 | * hwaccel has no need for preallocated room for CCMP | |
429 | * header or MIC fields | |
430 | */ | |
23c0752a | 431 | return 0; |
e039fa4a JB |
432 | } |
433 | ||
d5184cac | 434 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 JB |
435 | len = skb->len - hdrlen; |
436 | ||
813d7669 | 437 | if (info->control.hw_key) |
23c0752a | 438 | tail = 0; |
11a843b7 | 439 | else |
2b2ba0db | 440 | tail = mic_len; |
23c0752a JB |
441 | |
442 | if (WARN_ON(skb_tailroom(skb) < tail || | |
4325f6ca | 443 | skb_headroom(skb) < IEEE80211_CCMP_HDR_LEN)) |
23c0752a | 444 | return -1; |
f0706e82 | 445 | |
4325f6ca JB |
446 | pos = skb_push(skb, IEEE80211_CCMP_HDR_LEN); |
447 | memmove(pos, pos + IEEE80211_CCMP_HDR_LEN, hdrlen); | |
077a9154 AN |
448 | |
449 | /* the HW only needs room for the IV, but not the actual IV */ | |
e0830f71 AN |
450 | if (info->control.hw_key && |
451 | (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) | |
077a9154 AN |
452 | return 0; |
453 | ||
f0706e82 JB |
454 | hdr = (struct ieee80211_hdr *) pos; |
455 | pos += hdrlen; | |
456 | ||
db388a56 | 457 | pn64 = atomic64_inc_return(&key->conf.tx_pn); |
f0706e82 | 458 | |
aba83a0b JB |
459 | pn[5] = pn64; |
460 | pn[4] = pn64 >> 8; | |
461 | pn[3] = pn64 >> 16; | |
462 | pn[2] = pn64 >> 24; | |
463 | pn[1] = pn64 >> 32; | |
464 | pn[0] = pn64 >> 40; | |
f0706e82 | 465 | |
8f20fc24 | 466 | ccmp_pn2hdr(pos, pn, key->conf.keyidx); |
f0706e82 | 467 | |
813d7669 JB |
468 | /* hwaccel - with software CCMP header */ |
469 | if (info->control.hw_key) | |
f0706e82 | 470 | return 0; |
f0706e82 | 471 | |
4325f6ca | 472 | pos += IEEE80211_CCMP_HDR_LEN; |
30ef7ef9 | 473 | ccmp_special_blocks(skb, pn, b_0, aad); |
f4a067f9 | 474 | return ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, b_0, aad, pos, len, |
4133da73 | 475 | skb_put(skb, mic_len)); |
f0706e82 JB |
476 | } |
477 | ||
478 | ||
9ae54c84 | 479 | ieee80211_tx_result |
2b2ba0db JM |
480 | ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx, |
481 | unsigned int mic_len) | |
f0706e82 | 482 | { |
252b86c4 | 483 | struct sk_buff *skb; |
f0706e82 | 484 | |
5cf121c3 | 485 | ieee80211_tx_set_protected(tx); |
f0706e82 | 486 | |
252b86c4 | 487 | skb_queue_walk(&tx->skbs, skb) { |
2b2ba0db | 488 | if (ccmp_encrypt_skb(tx, skb, mic_len) < 0) |
2de8e0d9 | 489 | return TX_DROP; |
252b86c4 | 490 | } |
f0706e82 | 491 | |
9ae54c84 | 492 | return TX_CONTINUE; |
f0706e82 JB |
493 | } |
494 | ||
495 | ||
9ae54c84 | 496 | ieee80211_rx_result |
2b2ba0db JM |
497 | ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx, |
498 | unsigned int mic_len) | |
f0706e82 | 499 | { |
c34498b9 | 500 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
f0706e82 JB |
501 | int hdrlen; |
502 | struct ieee80211_key *key = rx->key; | |
503 | struct sk_buff *skb = rx->skb; | |
eb9fb5b8 | 504 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
4325f6ca | 505 | u8 pn[IEEE80211_CCMP_PN_LEN]; |
f0706e82 | 506 | int data_len; |
9190252c | 507 | int queue; |
f0706e82 | 508 | |
d5184cac | 509 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 | 510 | |
fb733336 | 511 | if (!ieee80211_is_data(hdr->frame_control) && |
d8ca16db | 512 | !ieee80211_is_robust_mgmt_frame(skb)) |
9ae54c84 | 513 | return RX_CONTINUE; |
f0706e82 | 514 | |
a8286911 | 515 | if (status->flag & RX_FLAG_DECRYPTED) { |
4325f6ca | 516 | if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_CCMP_HDR_LEN)) |
a8286911 | 517 | return RX_DROP_UNUSABLE; |
f980ebc0 SS |
518 | if (status->flag & RX_FLAG_MIC_STRIPPED) |
519 | mic_len = 0; | |
a8286911 JB |
520 | } else { |
521 | if (skb_linearize(rx->skb)) | |
522 | return RX_DROP_UNUSABLE; | |
523 | } | |
524 | ||
f980ebc0 SS |
525 | data_len = skb->len - hdrlen - IEEE80211_CCMP_HDR_LEN - mic_len; |
526 | if (!rx->sta || data_len < 0) | |
527 | return RX_DROP_UNUSABLE; | |
528 | ||
981d94a8 | 529 | if (!(status->flag & RX_FLAG_PN_VALIDATED)) { |
f631a77b SS |
530 | int res; |
531 | ||
981d94a8 | 532 | ccmp_hdr2pn(pn, skb->data + hdrlen); |
f0706e82 | 533 | |
981d94a8 | 534 | queue = rx->security_idx; |
9190252c | 535 | |
f631a77b SS |
536 | res = memcmp(pn, key->u.ccmp.rx_pn[queue], |
537 | IEEE80211_CCMP_PN_LEN); | |
538 | if (res < 0 || | |
539 | (!res && !(status->flag & RX_FLAG_ALLOW_SAME_PN))) { | |
981d94a8 | 540 | key->u.ccmp.replays++; |
e4c26add | 541 | return RX_DROP_UNUSABLE; |
981d94a8 JB |
542 | } |
543 | ||
544 | if (!(status->flag & RX_FLAG_DECRYPTED)) { | |
545 | u8 aad[2 * AES_BLOCK_SIZE]; | |
546 | u8 b_0[AES_BLOCK_SIZE]; | |
547 | /* hardware didn't decrypt/verify MIC */ | |
548 | ccmp_special_blocks(skb, pn, b_0, aad); | |
549 | ||
550 | if (ieee80211_aes_ccm_decrypt( | |
551 | key->u.ccmp.tfm, b_0, aad, | |
552 | skb->data + hdrlen + IEEE80211_CCMP_HDR_LEN, | |
553 | data_len, | |
4133da73 | 554 | skb->data + skb->len - mic_len)) |
981d94a8 JB |
555 | return RX_DROP_UNUSABLE; |
556 | } | |
557 | ||
558 | memcpy(key->u.ccmp.rx_pn[queue], pn, IEEE80211_CCMP_PN_LEN); | |
f0706e82 JB |
559 | } |
560 | ||
f0706e82 | 561 | /* Remove CCMP header and MIC */ |
2b2ba0db | 562 | if (pskb_trim(skb, skb->len - mic_len)) |
a8286911 | 563 | return RX_DROP_UNUSABLE; |
4325f6ca JB |
564 | memmove(skb->data + IEEE80211_CCMP_HDR_LEN, skb->data, hdrlen); |
565 | skb_pull(skb, IEEE80211_CCMP_HDR_LEN); | |
f0706e82 | 566 | |
9ae54c84 | 567 | return RX_CONTINUE; |
f0706e82 | 568 | } |
765cb46a | 569 | |
00b9cfa3 JM |
570 | static void gcmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *j_0, u8 *aad) |
571 | { | |
572 | __le16 mask_fc; | |
573 | u8 qos_tid; | |
574 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
575 | ||
576 | memcpy(j_0, hdr->addr2, ETH_ALEN); | |
577 | memcpy(&j_0[ETH_ALEN], pn, IEEE80211_GCMP_PN_LEN); | |
578 | j_0[13] = 0; | |
579 | j_0[14] = 0; | |
580 | j_0[AES_BLOCK_SIZE - 1] = 0x01; | |
581 | ||
582 | /* AAD (extra authenticate-only data) / masked 802.11 header | |
583 | * FC | A1 | A2 | A3 | SC | [A4] | [QC] | |
584 | */ | |
585 | put_unaligned_be16(ieee80211_hdrlen(hdr->frame_control) - 2, &aad[0]); | |
586 | /* Mask FC: zero subtype b4 b5 b6 (if not mgmt) | |
587 | * Retry, PwrMgt, MoreData; set Protected | |
588 | */ | |
589 | mask_fc = hdr->frame_control; | |
590 | mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | | |
591 | IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA); | |
592 | if (!ieee80211_is_mgmt(hdr->frame_control)) | |
593 | mask_fc &= ~cpu_to_le16(0x0070); | |
594 | mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); | |
595 | ||
596 | put_unaligned(mask_fc, (__le16 *)&aad[2]); | |
597 | memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN); | |
598 | ||
599 | /* Mask Seq#, leave Frag# */ | |
600 | aad[22] = *((u8 *)&hdr->seq_ctrl) & 0x0f; | |
601 | aad[23] = 0; | |
602 | ||
603 | if (ieee80211_is_data_qos(hdr->frame_control)) | |
a1f2ba04 | 604 | qos_tid = ieee80211_get_tid(hdr); |
00b9cfa3 JM |
605 | else |
606 | qos_tid = 0; | |
607 | ||
608 | if (ieee80211_has_a4(hdr->frame_control)) { | |
609 | memcpy(&aad[24], hdr->addr4, ETH_ALEN); | |
610 | aad[30] = qos_tid; | |
611 | aad[31] = 0; | |
612 | } else { | |
613 | memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN); | |
614 | aad[24] = qos_tid; | |
615 | } | |
616 | } | |
617 | ||
618 | static inline void gcmp_pn2hdr(u8 *hdr, const u8 *pn, int key_id) | |
619 | { | |
620 | hdr[0] = pn[5]; | |
621 | hdr[1] = pn[4]; | |
622 | hdr[2] = 0; | |
623 | hdr[3] = 0x20 | (key_id << 6); | |
624 | hdr[4] = pn[3]; | |
625 | hdr[5] = pn[2]; | |
626 | hdr[6] = pn[1]; | |
627 | hdr[7] = pn[0]; | |
628 | } | |
629 | ||
630 | static inline void gcmp_hdr2pn(u8 *pn, const u8 *hdr) | |
631 | { | |
632 | pn[0] = hdr[7]; | |
633 | pn[1] = hdr[6]; | |
634 | pn[2] = hdr[5]; | |
635 | pn[3] = hdr[4]; | |
636 | pn[4] = hdr[1]; | |
637 | pn[5] = hdr[0]; | |
638 | } | |
639 | ||
640 | static int gcmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb) | |
641 | { | |
642 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
643 | struct ieee80211_key *key = tx->key; | |
644 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
645 | int hdrlen, len, tail; | |
646 | u8 *pos; | |
647 | u8 pn[6]; | |
648 | u64 pn64; | |
f4a067f9 | 649 | u8 aad[GCM_AAD_LEN]; |
00b9cfa3 JM |
650 | u8 j_0[AES_BLOCK_SIZE]; |
651 | ||
652 | if (info->control.hw_key && | |
653 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) && | |
654 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) && | |
655 | !((info->control.hw_key->flags & | |
656 | IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) && | |
657 | ieee80211_is_mgmt(hdr->frame_control))) { | |
658 | /* hwaccel has no need for preallocated room for GCMP | |
659 | * header or MIC fields | |
660 | */ | |
661 | return 0; | |
662 | } | |
663 | ||
664 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
665 | len = skb->len - hdrlen; | |
666 | ||
667 | if (info->control.hw_key) | |
668 | tail = 0; | |
669 | else | |
670 | tail = IEEE80211_GCMP_MIC_LEN; | |
671 | ||
672 | if (WARN_ON(skb_tailroom(skb) < tail || | |
673 | skb_headroom(skb) < IEEE80211_GCMP_HDR_LEN)) | |
674 | return -1; | |
675 | ||
676 | pos = skb_push(skb, IEEE80211_GCMP_HDR_LEN); | |
677 | memmove(pos, pos + IEEE80211_GCMP_HDR_LEN, hdrlen); | |
678 | skb_set_network_header(skb, skb_network_offset(skb) + | |
679 | IEEE80211_GCMP_HDR_LEN); | |
680 | ||
681 | /* the HW only needs room for the IV, but not the actual IV */ | |
682 | if (info->control.hw_key && | |
683 | (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) | |
684 | return 0; | |
685 | ||
686 | hdr = (struct ieee80211_hdr *)pos; | |
687 | pos += hdrlen; | |
688 | ||
db388a56 | 689 | pn64 = atomic64_inc_return(&key->conf.tx_pn); |
00b9cfa3 JM |
690 | |
691 | pn[5] = pn64; | |
692 | pn[4] = pn64 >> 8; | |
693 | pn[3] = pn64 >> 16; | |
694 | pn[2] = pn64 >> 24; | |
695 | pn[1] = pn64 >> 32; | |
696 | pn[0] = pn64 >> 40; | |
697 | ||
698 | gcmp_pn2hdr(pos, pn, key->conf.keyidx); | |
699 | ||
700 | /* hwaccel - with software GCMP header */ | |
701 | if (info->control.hw_key) | |
702 | return 0; | |
703 | ||
704 | pos += IEEE80211_GCMP_HDR_LEN; | |
705 | gcmp_special_blocks(skb, pn, j_0, aad); | |
f4a067f9 AB |
706 | return ieee80211_aes_gcm_encrypt(key->u.gcmp.tfm, j_0, aad, pos, len, |
707 | skb_put(skb, IEEE80211_GCMP_MIC_LEN)); | |
00b9cfa3 JM |
708 | } |
709 | ||
710 | ieee80211_tx_result | |
711 | ieee80211_crypto_gcmp_encrypt(struct ieee80211_tx_data *tx) | |
712 | { | |
713 | struct sk_buff *skb; | |
714 | ||
715 | ieee80211_tx_set_protected(tx); | |
716 | ||
717 | skb_queue_walk(&tx->skbs, skb) { | |
718 | if (gcmp_encrypt_skb(tx, skb) < 0) | |
719 | return TX_DROP; | |
720 | } | |
721 | ||
722 | return TX_CONTINUE; | |
723 | } | |
724 | ||
725 | ieee80211_rx_result | |
726 | ieee80211_crypto_gcmp_decrypt(struct ieee80211_rx_data *rx) | |
727 | { | |
728 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; | |
729 | int hdrlen; | |
730 | struct ieee80211_key *key = rx->key; | |
731 | struct sk_buff *skb = rx->skb; | |
732 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
733 | u8 pn[IEEE80211_GCMP_PN_LEN]; | |
f980ebc0 | 734 | int data_len, queue, mic_len = IEEE80211_GCMP_MIC_LEN; |
00b9cfa3 JM |
735 | |
736 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
737 | ||
738 | if (!ieee80211_is_data(hdr->frame_control) && | |
739 | !ieee80211_is_robust_mgmt_frame(skb)) | |
740 | return RX_CONTINUE; | |
741 | ||
00b9cfa3 JM |
742 | if (status->flag & RX_FLAG_DECRYPTED) { |
743 | if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_GCMP_HDR_LEN)) | |
744 | return RX_DROP_UNUSABLE; | |
f980ebc0 SS |
745 | if (status->flag & RX_FLAG_MIC_STRIPPED) |
746 | mic_len = 0; | |
00b9cfa3 JM |
747 | } else { |
748 | if (skb_linearize(rx->skb)) | |
749 | return RX_DROP_UNUSABLE; | |
750 | } | |
751 | ||
f980ebc0 SS |
752 | data_len = skb->len - hdrlen - IEEE80211_GCMP_HDR_LEN - mic_len; |
753 | if (!rx->sta || data_len < 0) | |
754 | return RX_DROP_UNUSABLE; | |
755 | ||
981d94a8 | 756 | if (!(status->flag & RX_FLAG_PN_VALIDATED)) { |
f631a77b SS |
757 | int res; |
758 | ||
981d94a8 | 759 | gcmp_hdr2pn(pn, skb->data + hdrlen); |
00b9cfa3 | 760 | |
981d94a8 | 761 | queue = rx->security_idx; |
00b9cfa3 | 762 | |
f631a77b SS |
763 | res = memcmp(pn, key->u.gcmp.rx_pn[queue], |
764 | IEEE80211_GCMP_PN_LEN); | |
765 | if (res < 0 || | |
766 | (!res && !(status->flag & RX_FLAG_ALLOW_SAME_PN))) { | |
981d94a8 | 767 | key->u.gcmp.replays++; |
00b9cfa3 | 768 | return RX_DROP_UNUSABLE; |
981d94a8 JB |
769 | } |
770 | ||
771 | if (!(status->flag & RX_FLAG_DECRYPTED)) { | |
772 | u8 aad[2 * AES_BLOCK_SIZE]; | |
773 | u8 j_0[AES_BLOCK_SIZE]; | |
774 | /* hardware didn't decrypt/verify MIC */ | |
775 | gcmp_special_blocks(skb, pn, j_0, aad); | |
776 | ||
777 | if (ieee80211_aes_gcm_decrypt( | |
778 | key->u.gcmp.tfm, j_0, aad, | |
779 | skb->data + hdrlen + IEEE80211_GCMP_HDR_LEN, | |
780 | data_len, | |
781 | skb->data + skb->len - | |
782 | IEEE80211_GCMP_MIC_LEN)) | |
783 | return RX_DROP_UNUSABLE; | |
784 | } | |
785 | ||
786 | memcpy(key->u.gcmp.rx_pn[queue], pn, IEEE80211_GCMP_PN_LEN); | |
00b9cfa3 JM |
787 | } |
788 | ||
00b9cfa3 | 789 | /* Remove GCMP header and MIC */ |
f980ebc0 | 790 | if (pskb_trim(skb, skb->len - mic_len)) |
00b9cfa3 JM |
791 | return RX_DROP_UNUSABLE; |
792 | memmove(skb->data + IEEE80211_GCMP_HDR_LEN, skb->data, hdrlen); | |
793 | skb_pull(skb, IEEE80211_GCMP_HDR_LEN); | |
794 | ||
795 | return RX_CONTINUE; | |
796 | } | |
797 | ||
2475b1cc MS |
798 | static ieee80211_tx_result |
799 | ieee80211_crypto_cs_encrypt(struct ieee80211_tx_data *tx, | |
800 | struct sk_buff *skb) | |
801 | { | |
802 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
803 | struct ieee80211_key *key = tx->key; | |
804 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
2475b1cc | 805 | int hdrlen; |
c7ef38e0 | 806 | u8 *pos, iv_len = key->conf.iv_len; |
2475b1cc MS |
807 | |
808 | if (info->control.hw_key && | |
809 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) { | |
810 | /* hwaccel has no need for preallocated head room */ | |
811 | return TX_CONTINUE; | |
812 | } | |
813 | ||
c7ef38e0 CI |
814 | if (unlikely(skb_headroom(skb) < iv_len && |
815 | pskb_expand_head(skb, iv_len, 0, GFP_ATOMIC))) | |
2475b1cc MS |
816 | return TX_DROP; |
817 | ||
818 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
819 | ||
c7ef38e0 CI |
820 | pos = skb_push(skb, iv_len); |
821 | memmove(pos, pos + iv_len, hdrlen); | |
2475b1cc MS |
822 | |
823 | return TX_CONTINUE; | |
824 | } | |
825 | ||
826 | static inline int ieee80211_crypto_cs_pn_compare(u8 *pn1, u8 *pn2, int len) | |
827 | { | |
828 | int i; | |
829 | ||
830 | /* pn is little endian */ | |
831 | for (i = len - 1; i >= 0; i--) { | |
832 | if (pn1[i] < pn2[i]) | |
833 | return -1; | |
834 | else if (pn1[i] > pn2[i]) | |
835 | return 1; | |
836 | } | |
837 | ||
838 | return 0; | |
839 | } | |
840 | ||
841 | static ieee80211_rx_result | |
842 | ieee80211_crypto_cs_decrypt(struct ieee80211_rx_data *rx) | |
843 | { | |
844 | struct ieee80211_key *key = rx->key; | |
845 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; | |
846 | const struct ieee80211_cipher_scheme *cs = NULL; | |
847 | int hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
848 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); | |
849 | int data_len; | |
850 | u8 *rx_pn; | |
851 | u8 *skb_pn; | |
852 | u8 qos_tid; | |
853 | ||
854 | if (!rx->sta || !rx->sta->cipher_scheme || | |
855 | !(status->flag & RX_FLAG_DECRYPTED)) | |
856 | return RX_DROP_UNUSABLE; | |
857 | ||
858 | if (!ieee80211_is_data(hdr->frame_control)) | |
859 | return RX_CONTINUE; | |
860 | ||
861 | cs = rx->sta->cipher_scheme; | |
862 | ||
863 | data_len = rx->skb->len - hdrlen - cs->hdr_len; | |
864 | ||
865 | if (data_len < 0) | |
866 | return RX_DROP_UNUSABLE; | |
867 | ||
868 | if (ieee80211_is_data_qos(hdr->frame_control)) | |
a1f2ba04 | 869 | qos_tid = ieee80211_get_tid(hdr); |
2475b1cc MS |
870 | else |
871 | qos_tid = 0; | |
872 | ||
873 | if (skb_linearize(rx->skb)) | |
874 | return RX_DROP_UNUSABLE; | |
875 | ||
876 | hdr = (struct ieee80211_hdr *)rx->skb->data; | |
877 | ||
878 | rx_pn = key->u.gen.rx_pn[qos_tid]; | |
879 | skb_pn = rx->skb->data + hdrlen + cs->pn_off; | |
880 | ||
881 | if (ieee80211_crypto_cs_pn_compare(skb_pn, rx_pn, cs->pn_len) <= 0) | |
882 | return RX_DROP_UNUSABLE; | |
883 | ||
884 | memcpy(rx_pn, skb_pn, cs->pn_len); | |
885 | ||
886 | /* remove security header and MIC */ | |
887 | if (pskb_trim(rx->skb, rx->skb->len - cs->mic_len)) | |
888 | return RX_DROP_UNUSABLE; | |
889 | ||
890 | memmove(rx->skb->data + cs->hdr_len, rx->skb->data, hdrlen); | |
891 | skb_pull(rx->skb, cs->hdr_len); | |
892 | ||
893 | return RX_CONTINUE; | |
894 | } | |
765cb46a JM |
895 | |
896 | static void bip_aad(struct sk_buff *skb, u8 *aad) | |
897 | { | |
33766368 JM |
898 | __le16 mask_fc; |
899 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
900 | ||
765cb46a JM |
901 | /* BIP AAD: FC(masked) || A1 || A2 || A3 */ |
902 | ||
903 | /* FC type/subtype */ | |
765cb46a | 904 | /* Mask FC Retry, PwrMgt, MoreData flags to zero */ |
33766368 JM |
905 | mask_fc = hdr->frame_control; |
906 | mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | IEEE80211_FCTL_PM | | |
907 | IEEE80211_FCTL_MOREDATA); | |
908 | put_unaligned(mask_fc, (__le16 *) &aad[0]); | |
765cb46a | 909 | /* A1 || A2 || A3 */ |
33766368 | 910 | memcpy(aad + 2, &hdr->addr1, 3 * ETH_ALEN); |
765cb46a JM |
911 | } |
912 | ||
913 | ||
75396ae6 JB |
914 | static inline void bip_ipn_set64(u8 *d, u64 pn) |
915 | { | |
916 | *d++ = pn; | |
917 | *d++ = pn >> 8; | |
918 | *d++ = pn >> 16; | |
919 | *d++ = pn >> 24; | |
920 | *d++ = pn >> 32; | |
921 | *d = pn >> 40; | |
922 | } | |
923 | ||
765cb46a JM |
924 | static inline void bip_ipn_swap(u8 *d, const u8 *s) |
925 | { | |
926 | *d++ = s[5]; | |
927 | *d++ = s[4]; | |
928 | *d++ = s[3]; | |
929 | *d++ = s[2]; | |
930 | *d++ = s[1]; | |
931 | *d = s[0]; | |
932 | } | |
933 | ||
934 | ||
935 | ieee80211_tx_result | |
936 | ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx) | |
937 | { | |
252b86c4 JB |
938 | struct sk_buff *skb; |
939 | struct ieee80211_tx_info *info; | |
765cb46a JM |
940 | struct ieee80211_key *key = tx->key; |
941 | struct ieee80211_mmie *mmie; | |
75396ae6 JB |
942 | u8 aad[20]; |
943 | u64 pn64; | |
765cb46a | 944 | |
252b86c4 JB |
945 | if (WARN_ON(skb_queue_len(&tx->skbs) != 1)) |
946 | return TX_DROP; | |
947 | ||
948 | skb = skb_peek(&tx->skbs); | |
949 | ||
950 | info = IEEE80211_SKB_CB(skb); | |
951 | ||
813d7669 | 952 | if (info->control.hw_key) |
252b86c4 | 953 | return TX_CONTINUE; |
765cb46a JM |
954 | |
955 | if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie))) | |
956 | return TX_DROP; | |
957 | ||
4df864c1 | 958 | mmie = skb_put(skb, sizeof(*mmie)); |
765cb46a JM |
959 | mmie->element_id = WLAN_EID_MMIE; |
960 | mmie->length = sizeof(*mmie) - 2; | |
961 | mmie->key_id = cpu_to_le16(key->conf.keyidx); | |
962 | ||
963 | /* PN = PN + 1 */ | |
db388a56 | 964 | pn64 = atomic64_inc_return(&key->conf.tx_pn); |
765cb46a | 965 | |
75396ae6 | 966 | bip_ipn_set64(mmie->sequence_number, pn64); |
765cb46a JM |
967 | |
968 | bip_aad(skb, aad); | |
969 | ||
970 | /* | |
971 | * MIC = AES-128-CMAC(IGTK, AAD || Management Frame Body || MMIE, 64) | |
972 | */ | |
75396ae6 JB |
973 | ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad, |
974 | skb->data + 24, skb->len - 24, mmie->mic); | |
765cb46a JM |
975 | |
976 | return TX_CONTINUE; | |
977 | } | |
978 | ||
56c52da2 JM |
979 | ieee80211_tx_result |
980 | ieee80211_crypto_aes_cmac_256_encrypt(struct ieee80211_tx_data *tx) | |
981 | { | |
982 | struct sk_buff *skb; | |
983 | struct ieee80211_tx_info *info; | |
984 | struct ieee80211_key *key = tx->key; | |
985 | struct ieee80211_mmie_16 *mmie; | |
986 | u8 aad[20]; | |
987 | u64 pn64; | |
988 | ||
989 | if (WARN_ON(skb_queue_len(&tx->skbs) != 1)) | |
990 | return TX_DROP; | |
991 | ||
992 | skb = skb_peek(&tx->skbs); | |
993 | ||
994 | info = IEEE80211_SKB_CB(skb); | |
995 | ||
996 | if (info->control.hw_key) | |
997 | return TX_CONTINUE; | |
998 | ||
999 | if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie))) | |
1000 | return TX_DROP; | |
1001 | ||
4df864c1 | 1002 | mmie = skb_put(skb, sizeof(*mmie)); |
56c52da2 JM |
1003 | mmie->element_id = WLAN_EID_MMIE; |
1004 | mmie->length = sizeof(*mmie) - 2; | |
1005 | mmie->key_id = cpu_to_le16(key->conf.keyidx); | |
1006 | ||
1007 | /* PN = PN + 1 */ | |
db388a56 | 1008 | pn64 = atomic64_inc_return(&key->conf.tx_pn); |
56c52da2 JM |
1009 | |
1010 | bip_ipn_set64(mmie->sequence_number, pn64); | |
1011 | ||
1012 | bip_aad(skb, aad); | |
1013 | ||
1014 | /* MIC = AES-256-CMAC(IGTK, AAD || Management Frame Body || MMIE, 128) | |
1015 | */ | |
1016 | ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad, | |
1017 | skb->data + 24, skb->len - 24, mmie->mic); | |
1018 | ||
1019 | return TX_CONTINUE; | |
1020 | } | |
765cb46a JM |
1021 | |
1022 | ieee80211_rx_result | |
1023 | ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx) | |
1024 | { | |
1025 | struct sk_buff *skb = rx->skb; | |
eb9fb5b8 | 1026 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
765cb46a JM |
1027 | struct ieee80211_key *key = rx->key; |
1028 | struct ieee80211_mmie *mmie; | |
1029 | u8 aad[20], mic[8], ipn[6]; | |
1030 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
1031 | ||
1032 | if (!ieee80211_is_mgmt(hdr->frame_control)) | |
1033 | return RX_CONTINUE; | |
1034 | ||
a8286911 JB |
1035 | /* management frames are already linear */ |
1036 | ||
765cb46a JM |
1037 | if (skb->len < 24 + sizeof(*mmie)) |
1038 | return RX_DROP_UNUSABLE; | |
1039 | ||
1040 | mmie = (struct ieee80211_mmie *) | |
1041 | (skb->data + skb->len - sizeof(*mmie)); | |
1042 | if (mmie->element_id != WLAN_EID_MMIE || | |
1043 | mmie->length != sizeof(*mmie) - 2) | |
1044 | return RX_DROP_UNUSABLE; /* Invalid MMIE */ | |
1045 | ||
1046 | bip_ipn_swap(ipn, mmie->sequence_number); | |
1047 | ||
1048 | if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) { | |
1049 | key->u.aes_cmac.replays++; | |
1050 | return RX_DROP_UNUSABLE; | |
1051 | } | |
1052 | ||
eb9fb5b8 | 1053 | if (!(status->flag & RX_FLAG_DECRYPTED)) { |
765cb46a JM |
1054 | /* hardware didn't decrypt/verify MIC */ |
1055 | bip_aad(skb, aad); | |
75396ae6 | 1056 | ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad, |
765cb46a | 1057 | skb->data + 24, skb->len - 24, mic); |
98c67d18 | 1058 | if (crypto_memneq(mic, mmie->mic, sizeof(mmie->mic))) { |
765cb46a JM |
1059 | key->u.aes_cmac.icverrors++; |
1060 | return RX_DROP_UNUSABLE; | |
1061 | } | |
1062 | } | |
1063 | ||
1064 | memcpy(key->u.aes_cmac.rx_pn, ipn, 6); | |
1065 | ||
1066 | /* Remove MMIE */ | |
1067 | skb_trim(skb, skb->len - sizeof(*mmie)); | |
1068 | ||
1069 | return RX_CONTINUE; | |
1070 | } | |
d32a1028 | 1071 | |
56c52da2 JM |
1072 | ieee80211_rx_result |
1073 | ieee80211_crypto_aes_cmac_256_decrypt(struct ieee80211_rx_data *rx) | |
1074 | { | |
1075 | struct sk_buff *skb = rx->skb; | |
1076 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1077 | struct ieee80211_key *key = rx->key; | |
1078 | struct ieee80211_mmie_16 *mmie; | |
1079 | u8 aad[20], mic[16], ipn[6]; | |
1080 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
1081 | ||
1082 | if (!ieee80211_is_mgmt(hdr->frame_control)) | |
1083 | return RX_CONTINUE; | |
1084 | ||
1085 | /* management frames are already linear */ | |
1086 | ||
1087 | if (skb->len < 24 + sizeof(*mmie)) | |
1088 | return RX_DROP_UNUSABLE; | |
1089 | ||
1090 | mmie = (struct ieee80211_mmie_16 *) | |
1091 | (skb->data + skb->len - sizeof(*mmie)); | |
1092 | if (mmie->element_id != WLAN_EID_MMIE || | |
1093 | mmie->length != sizeof(*mmie) - 2) | |
1094 | return RX_DROP_UNUSABLE; /* Invalid MMIE */ | |
1095 | ||
1096 | bip_ipn_swap(ipn, mmie->sequence_number); | |
1097 | ||
1098 | if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) { | |
1099 | key->u.aes_cmac.replays++; | |
1100 | return RX_DROP_UNUSABLE; | |
1101 | } | |
1102 | ||
1103 | if (!(status->flag & RX_FLAG_DECRYPTED)) { | |
1104 | /* hardware didn't decrypt/verify MIC */ | |
1105 | bip_aad(skb, aad); | |
1106 | ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad, | |
1107 | skb->data + 24, skb->len - 24, mic); | |
98c67d18 | 1108 | if (crypto_memneq(mic, mmie->mic, sizeof(mmie->mic))) { |
56c52da2 JM |
1109 | key->u.aes_cmac.icverrors++; |
1110 | return RX_DROP_UNUSABLE; | |
1111 | } | |
1112 | } | |
1113 | ||
1114 | memcpy(key->u.aes_cmac.rx_pn, ipn, 6); | |
1115 | ||
1116 | /* Remove MMIE */ | |
1117 | skb_trim(skb, skb->len - sizeof(*mmie)); | |
1118 | ||
1119 | return RX_CONTINUE; | |
1120 | } | |
1121 | ||
8ade538b JM |
1122 | ieee80211_tx_result |
1123 | ieee80211_crypto_aes_gmac_encrypt(struct ieee80211_tx_data *tx) | |
1124 | { | |
1125 | struct sk_buff *skb; | |
1126 | struct ieee80211_tx_info *info; | |
1127 | struct ieee80211_key *key = tx->key; | |
1128 | struct ieee80211_mmie_16 *mmie; | |
1129 | struct ieee80211_hdr *hdr; | |
f4a067f9 | 1130 | u8 aad[GMAC_AAD_LEN]; |
8ade538b | 1131 | u64 pn64; |
f4a067f9 | 1132 | u8 nonce[GMAC_NONCE_LEN]; |
8ade538b JM |
1133 | |
1134 | if (WARN_ON(skb_queue_len(&tx->skbs) != 1)) | |
1135 | return TX_DROP; | |
1136 | ||
1137 | skb = skb_peek(&tx->skbs); | |
1138 | ||
1139 | info = IEEE80211_SKB_CB(skb); | |
1140 | ||
1141 | if (info->control.hw_key) | |
1142 | return TX_CONTINUE; | |
1143 | ||
1144 | if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie))) | |
1145 | return TX_DROP; | |
1146 | ||
4df864c1 | 1147 | mmie = skb_put(skb, sizeof(*mmie)); |
8ade538b JM |
1148 | mmie->element_id = WLAN_EID_MMIE; |
1149 | mmie->length = sizeof(*mmie) - 2; | |
1150 | mmie->key_id = cpu_to_le16(key->conf.keyidx); | |
1151 | ||
1152 | /* PN = PN + 1 */ | |
db388a56 | 1153 | pn64 = atomic64_inc_return(&key->conf.tx_pn); |
8ade538b JM |
1154 | |
1155 | bip_ipn_set64(mmie->sequence_number, pn64); | |
1156 | ||
1157 | bip_aad(skb, aad); | |
1158 | ||
1159 | hdr = (struct ieee80211_hdr *)skb->data; | |
1160 | memcpy(nonce, hdr->addr2, ETH_ALEN); | |
1161 | bip_ipn_swap(nonce + ETH_ALEN, mmie->sequence_number); | |
1162 | ||
1163 | /* MIC = AES-GMAC(IGTK, AAD || Management Frame Body || MMIE, 128) */ | |
1164 | if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce, | |
1165 | skb->data + 24, skb->len - 24, mmie->mic) < 0) | |
1166 | return TX_DROP; | |
1167 | ||
1168 | return TX_CONTINUE; | |
1169 | } | |
1170 | ||
1171 | ieee80211_rx_result | |
1172 | ieee80211_crypto_aes_gmac_decrypt(struct ieee80211_rx_data *rx) | |
1173 | { | |
1174 | struct sk_buff *skb = rx->skb; | |
1175 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1176 | struct ieee80211_key *key = rx->key; | |
1177 | struct ieee80211_mmie_16 *mmie; | |
f4a067f9 | 1178 | u8 aad[GMAC_AAD_LEN], mic[GMAC_MIC_LEN], ipn[6], nonce[GMAC_NONCE_LEN]; |
8ade538b JM |
1179 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
1180 | ||
1181 | if (!ieee80211_is_mgmt(hdr->frame_control)) | |
1182 | return RX_CONTINUE; | |
1183 | ||
1184 | /* management frames are already linear */ | |
1185 | ||
1186 | if (skb->len < 24 + sizeof(*mmie)) | |
1187 | return RX_DROP_UNUSABLE; | |
1188 | ||
1189 | mmie = (struct ieee80211_mmie_16 *) | |
1190 | (skb->data + skb->len - sizeof(*mmie)); | |
1191 | if (mmie->element_id != WLAN_EID_MMIE || | |
1192 | mmie->length != sizeof(*mmie) - 2) | |
1193 | return RX_DROP_UNUSABLE; /* Invalid MMIE */ | |
1194 | ||
1195 | bip_ipn_swap(ipn, mmie->sequence_number); | |
1196 | ||
1197 | if (memcmp(ipn, key->u.aes_gmac.rx_pn, 6) <= 0) { | |
1198 | key->u.aes_gmac.replays++; | |
1199 | return RX_DROP_UNUSABLE; | |
1200 | } | |
1201 | ||
1202 | if (!(status->flag & RX_FLAG_DECRYPTED)) { | |
1203 | /* hardware didn't decrypt/verify MIC */ | |
1204 | bip_aad(skb, aad); | |
1205 | ||
1206 | memcpy(nonce, hdr->addr2, ETH_ALEN); | |
1207 | memcpy(nonce + ETH_ALEN, ipn, 6); | |
1208 | ||
1209 | if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce, | |
1210 | skb->data + 24, skb->len - 24, | |
1211 | mic) < 0 || | |
98c67d18 | 1212 | crypto_memneq(mic, mmie->mic, sizeof(mmie->mic))) { |
8ade538b JM |
1213 | key->u.aes_gmac.icverrors++; |
1214 | return RX_DROP_UNUSABLE; | |
1215 | } | |
1216 | } | |
1217 | ||
1218 | memcpy(key->u.aes_gmac.rx_pn, ipn, 6); | |
1219 | ||
1220 | /* Remove MMIE */ | |
1221 | skb_trim(skb, skb->len - sizeof(*mmie)); | |
1222 | ||
1223 | return RX_CONTINUE; | |
1224 | } | |
1225 | ||
d32a1028 YD |
1226 | ieee80211_tx_result |
1227 | ieee80211_crypto_hw_encrypt(struct ieee80211_tx_data *tx) | |
1228 | { | |
1229 | struct sk_buff *skb; | |
1230 | struct ieee80211_tx_info *info = NULL; | |
2475b1cc | 1231 | ieee80211_tx_result res; |
d32a1028 YD |
1232 | |
1233 | skb_queue_walk(&tx->skbs, skb) { | |
1234 | info = IEEE80211_SKB_CB(skb); | |
1235 | ||
1236 | /* handle hw-only algorithm */ | |
1237 | if (!info->control.hw_key) | |
1238 | return TX_DROP; | |
2475b1cc | 1239 | |
c7ef38e0 | 1240 | if (tx->key->flags & KEY_FLAG_CIPHER_SCHEME) { |
2475b1cc MS |
1241 | res = ieee80211_crypto_cs_encrypt(tx, skb); |
1242 | if (res != TX_CONTINUE) | |
1243 | return res; | |
1244 | } | |
d32a1028 YD |
1245 | } |
1246 | ||
1247 | ieee80211_tx_set_protected(tx); | |
1248 | ||
1249 | return TX_CONTINUE; | |
1250 | } | |
2475b1cc MS |
1251 | |
1252 | ieee80211_rx_result | |
1253 | ieee80211_crypto_hw_decrypt(struct ieee80211_rx_data *rx) | |
1254 | { | |
aeb136c5 | 1255 | if (rx->sta && rx->sta->cipher_scheme) |
2475b1cc MS |
1256 | return ieee80211_crypto_cs_decrypt(rx); |
1257 | ||
1258 | return RX_DROP_UNUSABLE; | |
1259 | } |