Commit | Line | Data |
---|---|---|
f0706e82 JB |
1 | /* |
2 | * Copyright 2002-2004, Instant802 Networks, Inc. | |
765cb46a | 3 | * Copyright 2008, Jouni Malinen <j@w1.fi> |
f0706e82 JB |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | */ | |
9 | ||
10 | #include <linux/netdevice.h> | |
11 | #include <linux/types.h> | |
f0706e82 JB |
12 | #include <linux/skbuff.h> |
13 | #include <linux/compiler.h> | |
f14df804 | 14 | #include <linux/ieee80211.h> |
5a0e3ad6 | 15 | #include <linux/gfp.h> |
f14df804 | 16 | #include <asm/unaligned.h> |
f0706e82 | 17 | #include <net/mac80211.h> |
aba83a0b | 18 | #include <crypto/aes.h> |
eb063c17 | 19 | |
f0706e82 JB |
20 | #include "ieee80211_i.h" |
21 | #include "michael.h" | |
22 | #include "tkip.h" | |
23 | #include "aes_ccm.h" | |
765cb46a | 24 | #include "aes_cmac.h" |
8ade538b | 25 | #include "aes_gmac.h" |
00b9cfa3 | 26 | #include "aes_gcm.h" |
f0706e82 JB |
27 | #include "wpa.h" |
28 | ||
9ae54c84 | 29 | ieee80211_tx_result |
5cf121c3 | 30 | ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx) |
f0706e82 | 31 | { |
747d753d | 32 | u8 *data, *key, *mic; |
f0706e82 | 33 | size_t data_len; |
8e8862b7 HH |
34 | unsigned int hdrlen; |
35 | struct ieee80211_hdr *hdr; | |
f0706e82 | 36 | struct sk_buff *skb = tx->skb; |
813d7669 | 37 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
23c0752a | 38 | int tail; |
f0706e82 | 39 | |
c34498b9 | 40 | hdr = (struct ieee80211_hdr *)skb->data; |
97359d12 JB |
41 | if (!tx->key || tx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP || |
42 | skb->len < 24 || !ieee80211_is_data_present(hdr->frame_control)) | |
9ae54c84 | 43 | return TX_CONTINUE; |
f0706e82 | 44 | |
8e8862b7 HH |
45 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
46 | if (skb->len < hdrlen) | |
9ae54c84 | 47 | return TX_DROP; |
f0706e82 | 48 | |
8e8862b7 HH |
49 | data = skb->data + hdrlen; |
50 | data_len = skb->len - hdrlen; | |
51 | ||
681d1190 JM |
52 | if (unlikely(info->flags & IEEE80211_TX_INTFL_TKIP_MIC_FAILURE)) { |
53 | /* Need to use software crypto for the test */ | |
54 | info->control.hw_key = NULL; | |
55 | } | |
56 | ||
813d7669 | 57 | if (info->control.hw_key && |
a26eb27a JB |
58 | (info->flags & IEEE80211_TX_CTL_DONTFRAG || |
59 | tx->local->ops->set_frag_threshold) && | |
813d7669 JB |
60 | !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC)) { |
61 | /* hwaccel - with no need for SW-generated MMIC */ | |
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 | |
747d753d | 76 | key = &tx->key->conf.key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY]; |
f0706e82 | 77 | mic = skb_put(skb, MICHAEL_MIC_LEN); |
8e8862b7 | 78 | michael_mic(key, hdr, data, data_len, mic); |
681d1190 JM |
79 | if (unlikely(info->flags & IEEE80211_TX_INTFL_TKIP_MIC_FAILURE)) |
80 | mic[0]++; | |
f0706e82 | 81 | |
9ae54c84 | 82 | return TX_CONTINUE; |
f0706e82 JB |
83 | } |
84 | ||
85 | ||
9ae54c84 | 86 | ieee80211_rx_result |
5cf121c3 | 87 | ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx) |
f0706e82 | 88 | { |
747d753d | 89 | u8 *data, *key = NULL; |
f0706e82 | 90 | size_t data_len; |
8e8862b7 | 91 | unsigned int hdrlen; |
f0706e82 JB |
92 | u8 mic[MICHAEL_MIC_LEN]; |
93 | struct sk_buff *skb = rx->skb; | |
eb9fb5b8 JB |
94 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
95 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
f0706e82 | 96 | |
816c04fe CL |
97 | /* |
98 | * it makes no sense to check for MIC errors on anything other | |
99 | * than data frames. | |
100 | */ | |
101 | if (!ieee80211_is_data_present(hdr->frame_control)) | |
9ae54c84 | 102 | return RX_CONTINUE; |
f0706e82 | 103 | |
816c04fe CL |
104 | /* |
105 | * No way to verify the MIC if the hardware stripped it or | |
106 | * the IV with the key index. In this case we have solely rely | |
107 | * on the driver to set RX_FLAG_MMIC_ERROR in the event of a | |
108 | * MIC failure report. | |
109 | */ | |
110 | if (status->flag & (RX_FLAG_MMIC_STRIPPED | RX_FLAG_IV_STRIPPED)) { | |
111 | if (status->flag & RX_FLAG_MMIC_ERROR) | |
b98ea058 | 112 | goto mic_fail_no_key; |
816c04fe | 113 | |
4045f72b SG |
114 | if (!(status->flag & RX_FLAG_IV_STRIPPED) && rx->key && |
115 | rx->key->conf.cipher == WLAN_CIPHER_SUITE_TKIP) | |
816c04fe CL |
116 | goto update_iv; |
117 | ||
118 | return RX_CONTINUE; | |
119 | } | |
120 | ||
121 | /* | |
122 | * Some hardware seems to generate Michael MIC failure reports; even | |
123 | * though, the frame was not encrypted with TKIP and therefore has no | |
124 | * MIC. Ignore the flag them to avoid triggering countermeasures. | |
125 | */ | |
97359d12 | 126 | if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP || |
816c04fe | 127 | !(status->flag & RX_FLAG_DECRYPTED)) |
9ae54c84 | 128 | return RX_CONTINUE; |
f0706e82 | 129 | |
816c04fe CL |
130 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP && rx->key->conf.keyidx) { |
131 | /* | |
132 | * APs with pairwise keys should never receive Michael MIC | |
133 | * errors for non-zero keyidx because these are reserved for | |
134 | * group keys and only the AP is sending real multicast | |
87ee475e | 135 | * frames in the BSS. |
816c04fe CL |
136 | */ |
137 | return RX_DROP_UNUSABLE; | |
138 | } | |
139 | ||
140 | if (status->flag & RX_FLAG_MMIC_ERROR) | |
141 | goto mic_fail; | |
142 | ||
8e8862b7 HH |
143 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
144 | if (skb->len < hdrlen + MICHAEL_MIC_LEN) | |
e4c26add | 145 | return RX_DROP_UNUSABLE; |
f0706e82 | 146 | |
a8286911 JB |
147 | if (skb_linearize(rx->skb)) |
148 | return RX_DROP_UNUSABLE; | |
149 | hdr = (void *)skb->data; | |
150 | ||
8e8862b7 HH |
151 | data = skb->data + hdrlen; |
152 | data_len = skb->len - hdrlen - MICHAEL_MIC_LEN; | |
747d753d | 153 | key = &rx->key->conf.key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY]; |
8e8862b7 | 154 | michael_mic(key, hdr, data, data_len, mic); |
816c04fe CL |
155 | if (memcmp(mic, data + data_len, MICHAEL_MIC_LEN) != 0) |
156 | goto mic_fail; | |
f0706e82 | 157 | |
f0706e82 JB |
158 | /* remove Michael MIC from payload */ |
159 | skb_trim(skb, skb->len - MICHAEL_MIC_LEN); | |
160 | ||
816c04fe | 161 | update_iv: |
50741ae0 | 162 | /* update IV in key information to be able to detect replays */ |
9e26297a JB |
163 | rx->key->u.tkip.rx[rx->security_idx].iv32 = rx->tkip_iv32; |
164 | rx->key->u.tkip.rx[rx->security_idx].iv16 = rx->tkip_iv16; | |
50741ae0 | 165 | |
9ae54c84 | 166 | return RX_CONTINUE; |
816c04fe CL |
167 | |
168 | mic_fail: | |
b98ea058 S |
169 | rx->key->u.tkip.mic_failures++; |
170 | ||
171 | mic_fail_no_key: | |
a66b98db AN |
172 | /* |
173 | * In some cases the key can be unset - e.g. a multicast packet, in | |
174 | * a driver that supports HW encryption. Send up the key idx only if | |
175 | * the key is set. | |
176 | */ | |
177 | mac80211_ev_michael_mic_failure(rx->sdata, | |
178 | rx->key ? rx->key->conf.keyidx : -1, | |
816c04fe CL |
179 | (void *) skb->data, NULL, GFP_ATOMIC); |
180 | return RX_DROP_UNUSABLE; | |
f0706e82 JB |
181 | } |
182 | ||
183 | ||
e039fa4a | 184 | static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb) |
f0706e82 JB |
185 | { |
186 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
187 | struct ieee80211_key *key = tx->key; | |
e039fa4a | 188 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
d5184cac HH |
189 | unsigned int hdrlen; |
190 | int len, tail; | |
f0706e82 JB |
191 | u8 *pos; |
192 | ||
813d7669 | 193 | if (info->control.hw_key && |
ee70108f JD |
194 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) && |
195 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) { | |
813d7669 | 196 | /* hwaccel - with no need for software-generated IV */ |
23c0752a | 197 | return 0; |
e039fa4a JB |
198 | } |
199 | ||
d5184cac | 200 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 JB |
201 | len = skb->len - hdrlen; |
202 | ||
813d7669 | 203 | if (info->control.hw_key) |
23c0752a | 204 | tail = 0; |
11a843b7 | 205 | else |
4325f6ca | 206 | tail = IEEE80211_TKIP_ICV_LEN; |
23c0752a JB |
207 | |
208 | if (WARN_ON(skb_tailroom(skb) < tail || | |
4325f6ca | 209 | skb_headroom(skb) < IEEE80211_TKIP_IV_LEN)) |
23c0752a | 210 | return -1; |
f0706e82 | 211 | |
4325f6ca JB |
212 | pos = skb_push(skb, IEEE80211_TKIP_IV_LEN); |
213 | memmove(pos, pos + IEEE80211_TKIP_IV_LEN, hdrlen); | |
f0706e82 JB |
214 | pos += hdrlen; |
215 | ||
ee70108f JD |
216 | /* the HW only needs room for the IV, but not the actual IV */ |
217 | if (info->control.hw_key && | |
218 | (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) | |
219 | return 0; | |
220 | ||
f0706e82 | 221 | /* Increase IV for the frame */ |
03395003 | 222 | spin_lock(&key->u.tkip.txlock); |
b0f76b33 HH |
223 | key->u.tkip.tx.iv16++; |
224 | if (key->u.tkip.tx.iv16 == 0) | |
225 | key->u.tkip.tx.iv32++; | |
523b02ea | 226 | pos = ieee80211_tkip_add_iv(pos, key); |
03395003 | 227 | spin_unlock(&key->u.tkip.txlock); |
f0706e82 | 228 | |
813d7669 JB |
229 | /* hwaccel - with software IV */ |
230 | if (info->control.hw_key) | |
f0706e82 | 231 | return 0; |
f0706e82 JB |
232 | |
233 | /* Add room for ICV */ | |
4325f6ca | 234 | skb_put(skb, IEEE80211_TKIP_ICV_LEN); |
f0706e82 | 235 | |
3473187d | 236 | return ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm, |
523b02ea | 237 | key, skb, pos, len); |
f0706e82 JB |
238 | } |
239 | ||
240 | ||
9ae54c84 | 241 | ieee80211_tx_result |
5cf121c3 | 242 | ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx) |
f0706e82 | 243 | { |
252b86c4 | 244 | struct sk_buff *skb; |
f0706e82 | 245 | |
5cf121c3 | 246 | ieee80211_tx_set_protected(tx); |
f0706e82 | 247 | |
252b86c4 | 248 | skb_queue_walk(&tx->skbs, skb) { |
2de8e0d9 JB |
249 | if (tkip_encrypt_skb(tx, skb) < 0) |
250 | return TX_DROP; | |
252b86c4 | 251 | } |
f0706e82 | 252 | |
9ae54c84 | 253 | return TX_CONTINUE; |
f0706e82 JB |
254 | } |
255 | ||
256 | ||
9ae54c84 | 257 | ieee80211_rx_result |
5cf121c3 | 258 | ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx) |
f0706e82 JB |
259 | { |
260 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; | |
747d753d | 261 | int hdrlen, res, hwaccel = 0; |
f0706e82 JB |
262 | struct ieee80211_key *key = rx->key; |
263 | struct sk_buff *skb = rx->skb; | |
eb9fb5b8 | 264 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
f0706e82 | 265 | |
d5184cac | 266 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 | 267 | |
c34498b9 | 268 | if (!ieee80211_is_data(hdr->frame_control)) |
9ae54c84 | 269 | return RX_CONTINUE; |
f0706e82 JB |
270 | |
271 | if (!rx->sta || skb->len - hdrlen < 12) | |
e4c26add | 272 | return RX_DROP_UNUSABLE; |
f0706e82 | 273 | |
a8286911 JB |
274 | /* it may be possible to optimize this a bit more */ |
275 | if (skb_linearize(rx->skb)) | |
276 | return RX_DROP_UNUSABLE; | |
277 | hdr = (void *)skb->data; | |
278 | ||
dc1580dd JB |
279 | /* |
280 | * Let TKIP code verify IV, but skip decryption. | |
281 | * In the case where hardware checks the IV as well, | |
282 | * we don't even get here, see ieee80211_rx_h_decrypt() | |
283 | */ | |
284 | if (status->flag & RX_FLAG_DECRYPTED) | |
f0706e82 | 285 | hwaccel = 1; |
f0706e82 JB |
286 | |
287 | res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm, | |
288 | key, skb->data + hdrlen, | |
17741cdc | 289 | skb->len - hdrlen, rx->sta->sta.addr, |
9e26297a | 290 | hdr->addr1, hwaccel, rx->security_idx, |
5cf121c3 JB |
291 | &rx->tkip_iv32, |
292 | &rx->tkip_iv16); | |
747d753d | 293 | if (res != TKIP_DECRYPT_OK) |
e4c26add | 294 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
295 | |
296 | /* Trim ICV */ | |
4325f6ca | 297 | skb_trim(skb, skb->len - IEEE80211_TKIP_ICV_LEN); |
f0706e82 JB |
298 | |
299 | /* Remove IV */ | |
4325f6ca JB |
300 | memmove(skb->data + IEEE80211_TKIP_IV_LEN, skb->data, hdrlen); |
301 | skb_pull(skb, IEEE80211_TKIP_IV_LEN); | |
f0706e82 | 302 | |
9ae54c84 | 303 | return RX_CONTINUE; |
f0706e82 JB |
304 | } |
305 | ||
306 | ||
30ef7ef9 | 307 | static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad) |
f0706e82 | 308 | { |
f14df804 | 309 | __le16 mask_fc; |
fb733336 | 310 | int a4_included, mgmt; |
f14df804 | 311 | u8 qos_tid; |
7ec7c4a9 | 312 | u16 len_a; |
f14df804 HH |
313 | unsigned int hdrlen; |
314 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
f0706e82 | 315 | |
f14df804 | 316 | /* |
fb733336 | 317 | * Mask FC: zero subtype b4 b5 b6 (if not mgmt) |
f14df804 HH |
318 | * Retry, PwrMgt, MoreData; set Protected |
319 | */ | |
fb733336 | 320 | mgmt = ieee80211_is_mgmt(hdr->frame_control); |
f14df804 | 321 | mask_fc = hdr->frame_control; |
fb733336 | 322 | mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | |
f14df804 | 323 | IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA); |
fb733336 JM |
324 | if (!mgmt) |
325 | mask_fc &= ~cpu_to_le16(0x0070); | |
f14df804 HH |
326 | mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); |
327 | ||
328 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
329 | len_a = hdrlen - 2; | |
330 | a4_included = ieee80211_has_a4(hdr->frame_control); | |
f0706e82 | 331 | |
f14df804 HH |
332 | if (ieee80211_is_data_qos(hdr->frame_control)) |
333 | qos_tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; | |
334 | else | |
335 | qos_tid = 0; | |
336 | ||
7ec7c4a9 AB |
337 | /* In CCM, the initial vectors (IV) used for CTR mode encryption and CBC |
338 | * mode authentication are not allowed to collide, yet both are derived | |
339 | * from this vector b_0. We only set L := 1 here to indicate that the | |
340 | * data size can be represented in (L+1) bytes. The CCM layer will take | |
341 | * care of storing the data length in the top (L+1) bytes and setting | |
342 | * and clearing the other bits as is required to derive the two IVs. | |
343 | */ | |
344 | b_0[0] = 0x1; | |
f14df804 | 345 | |
fb733336 JM |
346 | /* Nonce: Nonce Flags | A2 | PN |
347 | * Nonce Flags: Priority (b0..b3) | Management (b4) | Reserved (b5..b7) | |
348 | */ | |
349 | b_0[1] = qos_tid | (mgmt << 4); | |
73e1f7c8 | 350 | memcpy(&b_0[2], hdr->addr2, ETH_ALEN); |
4325f6ca | 351 | memcpy(&b_0[8], pn, IEEE80211_CCMP_PN_LEN); |
f0706e82 JB |
352 | |
353 | /* AAD (extra authenticate-only data) / masked 802.11 header | |
354 | * FC | A1 | A2 | A3 | SC | [A4] | [QC] */ | |
f14df804 HH |
355 | put_unaligned_be16(len_a, &aad[0]); |
356 | put_unaligned(mask_fc, (__le16 *)&aad[2]); | |
73e1f7c8 | 357 | memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN); |
f0706e82 JB |
358 | |
359 | /* Mask Seq#, leave Frag# */ | |
360 | aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f; | |
361 | aad[23] = 0; | |
f14df804 | 362 | |
f0706e82 | 363 | if (a4_included) { |
73e1f7c8 | 364 | memcpy(&aad[24], hdr->addr4, ETH_ALEN); |
f14df804 | 365 | aad[30] = qos_tid; |
f0706e82 | 366 | aad[31] = 0; |
f14df804 | 367 | } else { |
73e1f7c8 | 368 | memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN); |
f14df804 | 369 | aad[24] = qos_tid; |
f0706e82 JB |
370 | } |
371 | } | |
372 | ||
373 | ||
374 | static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn, int key_id) | |
375 | { | |
376 | hdr[0] = pn[5]; | |
377 | hdr[1] = pn[4]; | |
378 | hdr[2] = 0; | |
379 | hdr[3] = 0x20 | (key_id << 6); | |
380 | hdr[4] = pn[3]; | |
381 | hdr[5] = pn[2]; | |
382 | hdr[6] = pn[1]; | |
383 | hdr[7] = pn[0]; | |
384 | } | |
385 | ||
386 | ||
c6a1fa12 | 387 | static inline void ccmp_hdr2pn(u8 *pn, u8 *hdr) |
f0706e82 JB |
388 | { |
389 | pn[0] = hdr[7]; | |
390 | pn[1] = hdr[6]; | |
391 | pn[2] = hdr[5]; | |
392 | pn[3] = hdr[4]; | |
393 | pn[4] = hdr[1]; | |
394 | pn[5] = hdr[0]; | |
f0706e82 JB |
395 | } |
396 | ||
397 | ||
2b2ba0db JM |
398 | static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb, |
399 | unsigned int mic_len) | |
f0706e82 JB |
400 | { |
401 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
402 | struct ieee80211_key *key = tx->key; | |
e039fa4a | 403 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
23c0752a | 404 | int hdrlen, len, tail; |
aba83a0b JB |
405 | u8 *pos; |
406 | u8 pn[6]; | |
407 | u64 pn64; | |
7ec7c4a9 AB |
408 | u8 aad[2 * AES_BLOCK_SIZE]; |
409 | u8 b_0[AES_BLOCK_SIZE]; | |
f0706e82 | 410 | |
813d7669 | 411 | if (info->control.hw_key && |
077a9154 | 412 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) && |
17d38fa8 MK |
413 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) && |
414 | !((info->control.hw_key->flags & | |
415 | IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) && | |
416 | ieee80211_is_mgmt(hdr->frame_control))) { | |
813d7669 JB |
417 | /* |
418 | * hwaccel has no need for preallocated room for CCMP | |
419 | * header or MIC fields | |
420 | */ | |
23c0752a | 421 | return 0; |
e039fa4a JB |
422 | } |
423 | ||
d5184cac | 424 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 JB |
425 | len = skb->len - hdrlen; |
426 | ||
813d7669 | 427 | if (info->control.hw_key) |
23c0752a | 428 | tail = 0; |
11a843b7 | 429 | else |
2b2ba0db | 430 | tail = mic_len; |
23c0752a JB |
431 | |
432 | if (WARN_ON(skb_tailroom(skb) < tail || | |
4325f6ca | 433 | skb_headroom(skb) < IEEE80211_CCMP_HDR_LEN)) |
23c0752a | 434 | return -1; |
f0706e82 | 435 | |
4325f6ca JB |
436 | pos = skb_push(skb, IEEE80211_CCMP_HDR_LEN); |
437 | memmove(pos, pos + IEEE80211_CCMP_HDR_LEN, hdrlen); | |
077a9154 AN |
438 | |
439 | /* the HW only needs room for the IV, but not the actual IV */ | |
e0830f71 AN |
440 | if (info->control.hw_key && |
441 | (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) | |
077a9154 AN |
442 | return 0; |
443 | ||
f0706e82 JB |
444 | hdr = (struct ieee80211_hdr *) pos; |
445 | pos += hdrlen; | |
446 | ||
db388a56 | 447 | pn64 = atomic64_inc_return(&key->conf.tx_pn); |
f0706e82 | 448 | |
aba83a0b JB |
449 | pn[5] = pn64; |
450 | pn[4] = pn64 >> 8; | |
451 | pn[3] = pn64 >> 16; | |
452 | pn[2] = pn64 >> 24; | |
453 | pn[1] = pn64 >> 32; | |
454 | pn[0] = pn64 >> 40; | |
f0706e82 | 455 | |
8f20fc24 | 456 | ccmp_pn2hdr(pos, pn, key->conf.keyidx); |
f0706e82 | 457 | |
813d7669 JB |
458 | /* hwaccel - with software CCMP header */ |
459 | if (info->control.hw_key) | |
f0706e82 | 460 | return 0; |
f0706e82 | 461 | |
4325f6ca | 462 | pos += IEEE80211_CCMP_HDR_LEN; |
30ef7ef9 | 463 | ccmp_special_blocks(skb, pn, b_0, aad); |
7ec7c4a9 | 464 | ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, b_0, aad, pos, len, |
2b2ba0db | 465 | skb_put(skb, mic_len), mic_len); |
f0706e82 JB |
466 | |
467 | return 0; | |
468 | } | |
469 | ||
470 | ||
9ae54c84 | 471 | ieee80211_tx_result |
2b2ba0db JM |
472 | ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx, |
473 | unsigned int mic_len) | |
f0706e82 | 474 | { |
252b86c4 | 475 | struct sk_buff *skb; |
f0706e82 | 476 | |
5cf121c3 | 477 | ieee80211_tx_set_protected(tx); |
f0706e82 | 478 | |
252b86c4 | 479 | skb_queue_walk(&tx->skbs, skb) { |
2b2ba0db | 480 | if (ccmp_encrypt_skb(tx, skb, mic_len) < 0) |
2de8e0d9 | 481 | return TX_DROP; |
252b86c4 | 482 | } |
f0706e82 | 483 | |
9ae54c84 | 484 | return TX_CONTINUE; |
f0706e82 JB |
485 | } |
486 | ||
487 | ||
9ae54c84 | 488 | ieee80211_rx_result |
2b2ba0db JM |
489 | ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx, |
490 | unsigned int mic_len) | |
f0706e82 | 491 | { |
c34498b9 | 492 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
f0706e82 JB |
493 | int hdrlen; |
494 | struct ieee80211_key *key = rx->key; | |
495 | struct sk_buff *skb = rx->skb; | |
eb9fb5b8 | 496 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
4325f6ca | 497 | u8 pn[IEEE80211_CCMP_PN_LEN]; |
f0706e82 | 498 | int data_len; |
9190252c | 499 | int queue; |
f0706e82 | 500 | |
d5184cac | 501 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 | 502 | |
fb733336 | 503 | if (!ieee80211_is_data(hdr->frame_control) && |
d8ca16db | 504 | !ieee80211_is_robust_mgmt_frame(skb)) |
9ae54c84 | 505 | return RX_CONTINUE; |
f0706e82 | 506 | |
2b2ba0db | 507 | data_len = skb->len - hdrlen - IEEE80211_CCMP_HDR_LEN - mic_len; |
f0706e82 | 508 | if (!rx->sta || data_len < 0) |
e4c26add | 509 | return RX_DROP_UNUSABLE; |
f0706e82 | 510 | |
a8286911 | 511 | if (status->flag & RX_FLAG_DECRYPTED) { |
4325f6ca | 512 | if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_CCMP_HDR_LEN)) |
a8286911 JB |
513 | return RX_DROP_UNUSABLE; |
514 | } else { | |
515 | if (skb_linearize(rx->skb)) | |
516 | return RX_DROP_UNUSABLE; | |
517 | } | |
518 | ||
c6a1fa12 | 519 | ccmp_hdr2pn(pn, skb->data + hdrlen); |
f0706e82 | 520 | |
9e26297a | 521 | queue = rx->security_idx; |
9190252c | 522 | |
4325f6ca | 523 | if (memcmp(pn, key->u.ccmp.rx_pn[queue], IEEE80211_CCMP_PN_LEN) <= 0) { |
f0706e82 | 524 | key->u.ccmp.replays++; |
e4c26add | 525 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
526 | } |
527 | ||
eb9fb5b8 | 528 | if (!(status->flag & RX_FLAG_DECRYPTED)) { |
7ec7c4a9 AB |
529 | u8 aad[2 * AES_BLOCK_SIZE]; |
530 | u8 b_0[AES_BLOCK_SIZE]; | |
7848ba7d | 531 | /* hardware didn't decrypt/verify MIC */ |
30ef7ef9 | 532 | ccmp_special_blocks(skb, pn, b_0, aad); |
f0706e82 JB |
533 | |
534 | if (ieee80211_aes_ccm_decrypt( | |
7ec7c4a9 | 535 | key->u.ccmp.tfm, b_0, aad, |
4325f6ca JB |
536 | skb->data + hdrlen + IEEE80211_CCMP_HDR_LEN, |
537 | data_len, | |
2b2ba0db | 538 | skb->data + skb->len - mic_len, mic_len)) |
e4c26add | 539 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
540 | } |
541 | ||
4325f6ca | 542 | memcpy(key->u.ccmp.rx_pn[queue], pn, IEEE80211_CCMP_PN_LEN); |
f0706e82 JB |
543 | |
544 | /* Remove CCMP header and MIC */ | |
2b2ba0db | 545 | if (pskb_trim(skb, skb->len - mic_len)) |
a8286911 | 546 | return RX_DROP_UNUSABLE; |
4325f6ca JB |
547 | memmove(skb->data + IEEE80211_CCMP_HDR_LEN, skb->data, hdrlen); |
548 | skb_pull(skb, IEEE80211_CCMP_HDR_LEN); | |
f0706e82 | 549 | |
9ae54c84 | 550 | return RX_CONTINUE; |
f0706e82 | 551 | } |
765cb46a | 552 | |
00b9cfa3 JM |
553 | static void gcmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *j_0, u8 *aad) |
554 | { | |
555 | __le16 mask_fc; | |
556 | u8 qos_tid; | |
557 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
558 | ||
559 | memcpy(j_0, hdr->addr2, ETH_ALEN); | |
560 | memcpy(&j_0[ETH_ALEN], pn, IEEE80211_GCMP_PN_LEN); | |
561 | j_0[13] = 0; | |
562 | j_0[14] = 0; | |
563 | j_0[AES_BLOCK_SIZE - 1] = 0x01; | |
564 | ||
565 | /* AAD (extra authenticate-only data) / masked 802.11 header | |
566 | * FC | A1 | A2 | A3 | SC | [A4] | [QC] | |
567 | */ | |
568 | put_unaligned_be16(ieee80211_hdrlen(hdr->frame_control) - 2, &aad[0]); | |
569 | /* Mask FC: zero subtype b4 b5 b6 (if not mgmt) | |
570 | * Retry, PwrMgt, MoreData; set Protected | |
571 | */ | |
572 | mask_fc = hdr->frame_control; | |
573 | mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | | |
574 | IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA); | |
575 | if (!ieee80211_is_mgmt(hdr->frame_control)) | |
576 | mask_fc &= ~cpu_to_le16(0x0070); | |
577 | mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); | |
578 | ||
579 | put_unaligned(mask_fc, (__le16 *)&aad[2]); | |
580 | memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN); | |
581 | ||
582 | /* Mask Seq#, leave Frag# */ | |
583 | aad[22] = *((u8 *)&hdr->seq_ctrl) & 0x0f; | |
584 | aad[23] = 0; | |
585 | ||
586 | if (ieee80211_is_data_qos(hdr->frame_control)) | |
587 | qos_tid = *ieee80211_get_qos_ctl(hdr) & | |
588 | IEEE80211_QOS_CTL_TID_MASK; | |
589 | else | |
590 | qos_tid = 0; | |
591 | ||
592 | if (ieee80211_has_a4(hdr->frame_control)) { | |
593 | memcpy(&aad[24], hdr->addr4, ETH_ALEN); | |
594 | aad[30] = qos_tid; | |
595 | aad[31] = 0; | |
596 | } else { | |
597 | memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN); | |
598 | aad[24] = qos_tid; | |
599 | } | |
600 | } | |
601 | ||
602 | static inline void gcmp_pn2hdr(u8 *hdr, const u8 *pn, int key_id) | |
603 | { | |
604 | hdr[0] = pn[5]; | |
605 | hdr[1] = pn[4]; | |
606 | hdr[2] = 0; | |
607 | hdr[3] = 0x20 | (key_id << 6); | |
608 | hdr[4] = pn[3]; | |
609 | hdr[5] = pn[2]; | |
610 | hdr[6] = pn[1]; | |
611 | hdr[7] = pn[0]; | |
612 | } | |
613 | ||
614 | static inline void gcmp_hdr2pn(u8 *pn, const u8 *hdr) | |
615 | { | |
616 | pn[0] = hdr[7]; | |
617 | pn[1] = hdr[6]; | |
618 | pn[2] = hdr[5]; | |
619 | pn[3] = hdr[4]; | |
620 | pn[4] = hdr[1]; | |
621 | pn[5] = hdr[0]; | |
622 | } | |
623 | ||
624 | static int gcmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb) | |
625 | { | |
626 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
627 | struct ieee80211_key *key = tx->key; | |
628 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
629 | int hdrlen, len, tail; | |
630 | u8 *pos; | |
631 | u8 pn[6]; | |
632 | u64 pn64; | |
633 | u8 aad[2 * AES_BLOCK_SIZE]; | |
634 | u8 j_0[AES_BLOCK_SIZE]; | |
635 | ||
636 | if (info->control.hw_key && | |
637 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) && | |
638 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) && | |
639 | !((info->control.hw_key->flags & | |
640 | IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) && | |
641 | ieee80211_is_mgmt(hdr->frame_control))) { | |
642 | /* hwaccel has no need for preallocated room for GCMP | |
643 | * header or MIC fields | |
644 | */ | |
645 | return 0; | |
646 | } | |
647 | ||
648 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
649 | len = skb->len - hdrlen; | |
650 | ||
651 | if (info->control.hw_key) | |
652 | tail = 0; | |
653 | else | |
654 | tail = IEEE80211_GCMP_MIC_LEN; | |
655 | ||
656 | if (WARN_ON(skb_tailroom(skb) < tail || | |
657 | skb_headroom(skb) < IEEE80211_GCMP_HDR_LEN)) | |
658 | return -1; | |
659 | ||
660 | pos = skb_push(skb, IEEE80211_GCMP_HDR_LEN); | |
661 | memmove(pos, pos + IEEE80211_GCMP_HDR_LEN, hdrlen); | |
662 | skb_set_network_header(skb, skb_network_offset(skb) + | |
663 | IEEE80211_GCMP_HDR_LEN); | |
664 | ||
665 | /* the HW only needs room for the IV, but not the actual IV */ | |
666 | if (info->control.hw_key && | |
667 | (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) | |
668 | return 0; | |
669 | ||
670 | hdr = (struct ieee80211_hdr *)pos; | |
671 | pos += hdrlen; | |
672 | ||
db388a56 | 673 | pn64 = atomic64_inc_return(&key->conf.tx_pn); |
00b9cfa3 JM |
674 | |
675 | pn[5] = pn64; | |
676 | pn[4] = pn64 >> 8; | |
677 | pn[3] = pn64 >> 16; | |
678 | pn[2] = pn64 >> 24; | |
679 | pn[1] = pn64 >> 32; | |
680 | pn[0] = pn64 >> 40; | |
681 | ||
682 | gcmp_pn2hdr(pos, pn, key->conf.keyidx); | |
683 | ||
684 | /* hwaccel - with software GCMP header */ | |
685 | if (info->control.hw_key) | |
686 | return 0; | |
687 | ||
688 | pos += IEEE80211_GCMP_HDR_LEN; | |
689 | gcmp_special_blocks(skb, pn, j_0, aad); | |
690 | ieee80211_aes_gcm_encrypt(key->u.gcmp.tfm, j_0, aad, pos, len, | |
691 | skb_put(skb, IEEE80211_GCMP_MIC_LEN)); | |
692 | ||
693 | return 0; | |
694 | } | |
695 | ||
696 | ieee80211_tx_result | |
697 | ieee80211_crypto_gcmp_encrypt(struct ieee80211_tx_data *tx) | |
698 | { | |
699 | struct sk_buff *skb; | |
700 | ||
701 | ieee80211_tx_set_protected(tx); | |
702 | ||
703 | skb_queue_walk(&tx->skbs, skb) { | |
704 | if (gcmp_encrypt_skb(tx, skb) < 0) | |
705 | return TX_DROP; | |
706 | } | |
707 | ||
708 | return TX_CONTINUE; | |
709 | } | |
710 | ||
711 | ieee80211_rx_result | |
712 | ieee80211_crypto_gcmp_decrypt(struct ieee80211_rx_data *rx) | |
713 | { | |
714 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; | |
715 | int hdrlen; | |
716 | struct ieee80211_key *key = rx->key; | |
717 | struct sk_buff *skb = rx->skb; | |
718 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
719 | u8 pn[IEEE80211_GCMP_PN_LEN]; | |
720 | int data_len; | |
721 | int queue; | |
722 | ||
723 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
724 | ||
725 | if (!ieee80211_is_data(hdr->frame_control) && | |
726 | !ieee80211_is_robust_mgmt_frame(skb)) | |
727 | return RX_CONTINUE; | |
728 | ||
729 | data_len = skb->len - hdrlen - IEEE80211_GCMP_HDR_LEN - | |
730 | IEEE80211_GCMP_MIC_LEN; | |
731 | if (!rx->sta || data_len < 0) | |
732 | return RX_DROP_UNUSABLE; | |
733 | ||
734 | if (status->flag & RX_FLAG_DECRYPTED) { | |
735 | if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_GCMP_HDR_LEN)) | |
736 | return RX_DROP_UNUSABLE; | |
737 | } else { | |
738 | if (skb_linearize(rx->skb)) | |
739 | return RX_DROP_UNUSABLE; | |
740 | } | |
741 | ||
742 | gcmp_hdr2pn(pn, skb->data + hdrlen); | |
743 | ||
744 | queue = rx->security_idx; | |
745 | ||
746 | if (memcmp(pn, key->u.gcmp.rx_pn[queue], IEEE80211_GCMP_PN_LEN) <= 0) { | |
747 | key->u.gcmp.replays++; | |
748 | return RX_DROP_UNUSABLE; | |
749 | } | |
750 | ||
751 | if (!(status->flag & RX_FLAG_DECRYPTED)) { | |
752 | u8 aad[2 * AES_BLOCK_SIZE]; | |
753 | u8 j_0[AES_BLOCK_SIZE]; | |
754 | /* hardware didn't decrypt/verify MIC */ | |
755 | gcmp_special_blocks(skb, pn, j_0, aad); | |
756 | ||
757 | if (ieee80211_aes_gcm_decrypt( | |
758 | key->u.gcmp.tfm, j_0, aad, | |
759 | skb->data + hdrlen + IEEE80211_GCMP_HDR_LEN, | |
760 | data_len, | |
761 | skb->data + skb->len - IEEE80211_GCMP_MIC_LEN)) | |
762 | return RX_DROP_UNUSABLE; | |
763 | } | |
764 | ||
765 | memcpy(key->u.gcmp.rx_pn[queue], pn, IEEE80211_GCMP_PN_LEN); | |
766 | ||
767 | /* Remove GCMP header and MIC */ | |
768 | if (pskb_trim(skb, skb->len - IEEE80211_GCMP_MIC_LEN)) | |
769 | return RX_DROP_UNUSABLE; | |
770 | memmove(skb->data + IEEE80211_GCMP_HDR_LEN, skb->data, hdrlen); | |
771 | skb_pull(skb, IEEE80211_GCMP_HDR_LEN); | |
772 | ||
773 | return RX_CONTINUE; | |
774 | } | |
775 | ||
2475b1cc MS |
776 | static ieee80211_tx_result |
777 | ieee80211_crypto_cs_encrypt(struct ieee80211_tx_data *tx, | |
778 | struct sk_buff *skb) | |
779 | { | |
780 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
781 | struct ieee80211_key *key = tx->key; | |
782 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
2475b1cc | 783 | int hdrlen; |
c7ef38e0 | 784 | u8 *pos, iv_len = key->conf.iv_len; |
2475b1cc MS |
785 | |
786 | if (info->control.hw_key && | |
787 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) { | |
788 | /* hwaccel has no need for preallocated head room */ | |
789 | return TX_CONTINUE; | |
790 | } | |
791 | ||
c7ef38e0 CI |
792 | if (unlikely(skb_headroom(skb) < iv_len && |
793 | pskb_expand_head(skb, iv_len, 0, GFP_ATOMIC))) | |
2475b1cc MS |
794 | return TX_DROP; |
795 | ||
796 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
797 | ||
c7ef38e0 CI |
798 | pos = skb_push(skb, iv_len); |
799 | memmove(pos, pos + iv_len, hdrlen); | |
2475b1cc MS |
800 | |
801 | return TX_CONTINUE; | |
802 | } | |
803 | ||
804 | static inline int ieee80211_crypto_cs_pn_compare(u8 *pn1, u8 *pn2, int len) | |
805 | { | |
806 | int i; | |
807 | ||
808 | /* pn is little endian */ | |
809 | for (i = len - 1; i >= 0; i--) { | |
810 | if (pn1[i] < pn2[i]) | |
811 | return -1; | |
812 | else if (pn1[i] > pn2[i]) | |
813 | return 1; | |
814 | } | |
815 | ||
816 | return 0; | |
817 | } | |
818 | ||
819 | static ieee80211_rx_result | |
820 | ieee80211_crypto_cs_decrypt(struct ieee80211_rx_data *rx) | |
821 | { | |
822 | struct ieee80211_key *key = rx->key; | |
823 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; | |
824 | const struct ieee80211_cipher_scheme *cs = NULL; | |
825 | int hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
826 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); | |
827 | int data_len; | |
828 | u8 *rx_pn; | |
829 | u8 *skb_pn; | |
830 | u8 qos_tid; | |
831 | ||
832 | if (!rx->sta || !rx->sta->cipher_scheme || | |
833 | !(status->flag & RX_FLAG_DECRYPTED)) | |
834 | return RX_DROP_UNUSABLE; | |
835 | ||
836 | if (!ieee80211_is_data(hdr->frame_control)) | |
837 | return RX_CONTINUE; | |
838 | ||
839 | cs = rx->sta->cipher_scheme; | |
840 | ||
841 | data_len = rx->skb->len - hdrlen - cs->hdr_len; | |
842 | ||
843 | if (data_len < 0) | |
844 | return RX_DROP_UNUSABLE; | |
845 | ||
846 | if (ieee80211_is_data_qos(hdr->frame_control)) | |
847 | qos_tid = *ieee80211_get_qos_ctl(hdr) & | |
848 | IEEE80211_QOS_CTL_TID_MASK; | |
849 | else | |
850 | qos_tid = 0; | |
851 | ||
852 | if (skb_linearize(rx->skb)) | |
853 | return RX_DROP_UNUSABLE; | |
854 | ||
855 | hdr = (struct ieee80211_hdr *)rx->skb->data; | |
856 | ||
857 | rx_pn = key->u.gen.rx_pn[qos_tid]; | |
858 | skb_pn = rx->skb->data + hdrlen + cs->pn_off; | |
859 | ||
860 | if (ieee80211_crypto_cs_pn_compare(skb_pn, rx_pn, cs->pn_len) <= 0) | |
861 | return RX_DROP_UNUSABLE; | |
862 | ||
863 | memcpy(rx_pn, skb_pn, cs->pn_len); | |
864 | ||
865 | /* remove security header and MIC */ | |
866 | if (pskb_trim(rx->skb, rx->skb->len - cs->mic_len)) | |
867 | return RX_DROP_UNUSABLE; | |
868 | ||
869 | memmove(rx->skb->data + cs->hdr_len, rx->skb->data, hdrlen); | |
870 | skb_pull(rx->skb, cs->hdr_len); | |
871 | ||
872 | return RX_CONTINUE; | |
873 | } | |
765cb46a JM |
874 | |
875 | static void bip_aad(struct sk_buff *skb, u8 *aad) | |
876 | { | |
33766368 JM |
877 | __le16 mask_fc; |
878 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
879 | ||
765cb46a JM |
880 | /* BIP AAD: FC(masked) || A1 || A2 || A3 */ |
881 | ||
882 | /* FC type/subtype */ | |
765cb46a | 883 | /* Mask FC Retry, PwrMgt, MoreData flags to zero */ |
33766368 JM |
884 | mask_fc = hdr->frame_control; |
885 | mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | IEEE80211_FCTL_PM | | |
886 | IEEE80211_FCTL_MOREDATA); | |
887 | put_unaligned(mask_fc, (__le16 *) &aad[0]); | |
765cb46a | 888 | /* A1 || A2 || A3 */ |
33766368 | 889 | memcpy(aad + 2, &hdr->addr1, 3 * ETH_ALEN); |
765cb46a JM |
890 | } |
891 | ||
892 | ||
75396ae6 JB |
893 | static inline void bip_ipn_set64(u8 *d, u64 pn) |
894 | { | |
895 | *d++ = pn; | |
896 | *d++ = pn >> 8; | |
897 | *d++ = pn >> 16; | |
898 | *d++ = pn >> 24; | |
899 | *d++ = pn >> 32; | |
900 | *d = pn >> 40; | |
901 | } | |
902 | ||
765cb46a JM |
903 | static inline void bip_ipn_swap(u8 *d, const u8 *s) |
904 | { | |
905 | *d++ = s[5]; | |
906 | *d++ = s[4]; | |
907 | *d++ = s[3]; | |
908 | *d++ = s[2]; | |
909 | *d++ = s[1]; | |
910 | *d = s[0]; | |
911 | } | |
912 | ||
913 | ||
914 | ieee80211_tx_result | |
915 | ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx) | |
916 | { | |
252b86c4 JB |
917 | struct sk_buff *skb; |
918 | struct ieee80211_tx_info *info; | |
765cb46a JM |
919 | struct ieee80211_key *key = tx->key; |
920 | struct ieee80211_mmie *mmie; | |
75396ae6 JB |
921 | u8 aad[20]; |
922 | u64 pn64; | |
765cb46a | 923 | |
252b86c4 JB |
924 | if (WARN_ON(skb_queue_len(&tx->skbs) != 1)) |
925 | return TX_DROP; | |
926 | ||
927 | skb = skb_peek(&tx->skbs); | |
928 | ||
929 | info = IEEE80211_SKB_CB(skb); | |
930 | ||
813d7669 | 931 | if (info->control.hw_key) |
252b86c4 | 932 | return TX_CONTINUE; |
765cb46a JM |
933 | |
934 | if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie))) | |
935 | return TX_DROP; | |
936 | ||
937 | mmie = (struct ieee80211_mmie *) skb_put(skb, sizeof(*mmie)); | |
938 | mmie->element_id = WLAN_EID_MMIE; | |
939 | mmie->length = sizeof(*mmie) - 2; | |
940 | mmie->key_id = cpu_to_le16(key->conf.keyidx); | |
941 | ||
942 | /* PN = PN + 1 */ | |
db388a56 | 943 | pn64 = atomic64_inc_return(&key->conf.tx_pn); |
765cb46a | 944 | |
75396ae6 | 945 | bip_ipn_set64(mmie->sequence_number, pn64); |
765cb46a JM |
946 | |
947 | bip_aad(skb, aad); | |
948 | ||
949 | /* | |
950 | * MIC = AES-128-CMAC(IGTK, AAD || Management Frame Body || MMIE, 64) | |
951 | */ | |
75396ae6 JB |
952 | ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad, |
953 | skb->data + 24, skb->len - 24, mmie->mic); | |
765cb46a JM |
954 | |
955 | return TX_CONTINUE; | |
956 | } | |
957 | ||
56c52da2 JM |
958 | ieee80211_tx_result |
959 | ieee80211_crypto_aes_cmac_256_encrypt(struct ieee80211_tx_data *tx) | |
960 | { | |
961 | struct sk_buff *skb; | |
962 | struct ieee80211_tx_info *info; | |
963 | struct ieee80211_key *key = tx->key; | |
964 | struct ieee80211_mmie_16 *mmie; | |
965 | u8 aad[20]; | |
966 | u64 pn64; | |
967 | ||
968 | if (WARN_ON(skb_queue_len(&tx->skbs) != 1)) | |
969 | return TX_DROP; | |
970 | ||
971 | skb = skb_peek(&tx->skbs); | |
972 | ||
973 | info = IEEE80211_SKB_CB(skb); | |
974 | ||
975 | if (info->control.hw_key) | |
976 | return TX_CONTINUE; | |
977 | ||
978 | if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie))) | |
979 | return TX_DROP; | |
980 | ||
981 | mmie = (struct ieee80211_mmie_16 *)skb_put(skb, sizeof(*mmie)); | |
982 | mmie->element_id = WLAN_EID_MMIE; | |
983 | mmie->length = sizeof(*mmie) - 2; | |
984 | mmie->key_id = cpu_to_le16(key->conf.keyidx); | |
985 | ||
986 | /* PN = PN + 1 */ | |
db388a56 | 987 | pn64 = atomic64_inc_return(&key->conf.tx_pn); |
56c52da2 JM |
988 | |
989 | bip_ipn_set64(mmie->sequence_number, pn64); | |
990 | ||
991 | bip_aad(skb, aad); | |
992 | ||
993 | /* MIC = AES-256-CMAC(IGTK, AAD || Management Frame Body || MMIE, 128) | |
994 | */ | |
995 | ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad, | |
996 | skb->data + 24, skb->len - 24, mmie->mic); | |
997 | ||
998 | return TX_CONTINUE; | |
999 | } | |
765cb46a JM |
1000 | |
1001 | ieee80211_rx_result | |
1002 | ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx) | |
1003 | { | |
1004 | struct sk_buff *skb = rx->skb; | |
eb9fb5b8 | 1005 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
765cb46a JM |
1006 | struct ieee80211_key *key = rx->key; |
1007 | struct ieee80211_mmie *mmie; | |
1008 | u8 aad[20], mic[8], ipn[6]; | |
1009 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
1010 | ||
1011 | if (!ieee80211_is_mgmt(hdr->frame_control)) | |
1012 | return RX_CONTINUE; | |
1013 | ||
a8286911 JB |
1014 | /* management frames are already linear */ |
1015 | ||
765cb46a JM |
1016 | if (skb->len < 24 + sizeof(*mmie)) |
1017 | return RX_DROP_UNUSABLE; | |
1018 | ||
1019 | mmie = (struct ieee80211_mmie *) | |
1020 | (skb->data + skb->len - sizeof(*mmie)); | |
1021 | if (mmie->element_id != WLAN_EID_MMIE || | |
1022 | mmie->length != sizeof(*mmie) - 2) | |
1023 | return RX_DROP_UNUSABLE; /* Invalid MMIE */ | |
1024 | ||
1025 | bip_ipn_swap(ipn, mmie->sequence_number); | |
1026 | ||
1027 | if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) { | |
1028 | key->u.aes_cmac.replays++; | |
1029 | return RX_DROP_UNUSABLE; | |
1030 | } | |
1031 | ||
eb9fb5b8 | 1032 | if (!(status->flag & RX_FLAG_DECRYPTED)) { |
765cb46a JM |
1033 | /* hardware didn't decrypt/verify MIC */ |
1034 | bip_aad(skb, aad); | |
75396ae6 | 1035 | ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad, |
765cb46a JM |
1036 | skb->data + 24, skb->len - 24, mic); |
1037 | if (memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) { | |
1038 | key->u.aes_cmac.icverrors++; | |
1039 | return RX_DROP_UNUSABLE; | |
1040 | } | |
1041 | } | |
1042 | ||
1043 | memcpy(key->u.aes_cmac.rx_pn, ipn, 6); | |
1044 | ||
1045 | /* Remove MMIE */ | |
1046 | skb_trim(skb, skb->len - sizeof(*mmie)); | |
1047 | ||
1048 | return RX_CONTINUE; | |
1049 | } | |
d32a1028 | 1050 | |
56c52da2 JM |
1051 | ieee80211_rx_result |
1052 | ieee80211_crypto_aes_cmac_256_decrypt(struct ieee80211_rx_data *rx) | |
1053 | { | |
1054 | struct sk_buff *skb = rx->skb; | |
1055 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1056 | struct ieee80211_key *key = rx->key; | |
1057 | struct ieee80211_mmie_16 *mmie; | |
1058 | u8 aad[20], mic[16], ipn[6]; | |
1059 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
1060 | ||
1061 | if (!ieee80211_is_mgmt(hdr->frame_control)) | |
1062 | return RX_CONTINUE; | |
1063 | ||
1064 | /* management frames are already linear */ | |
1065 | ||
1066 | if (skb->len < 24 + sizeof(*mmie)) | |
1067 | return RX_DROP_UNUSABLE; | |
1068 | ||
1069 | mmie = (struct ieee80211_mmie_16 *) | |
1070 | (skb->data + skb->len - sizeof(*mmie)); | |
1071 | if (mmie->element_id != WLAN_EID_MMIE || | |
1072 | mmie->length != sizeof(*mmie) - 2) | |
1073 | return RX_DROP_UNUSABLE; /* Invalid MMIE */ | |
1074 | ||
1075 | bip_ipn_swap(ipn, mmie->sequence_number); | |
1076 | ||
1077 | if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) { | |
1078 | key->u.aes_cmac.replays++; | |
1079 | return RX_DROP_UNUSABLE; | |
1080 | } | |
1081 | ||
1082 | if (!(status->flag & RX_FLAG_DECRYPTED)) { | |
1083 | /* hardware didn't decrypt/verify MIC */ | |
1084 | bip_aad(skb, aad); | |
1085 | ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad, | |
1086 | skb->data + 24, skb->len - 24, mic); | |
1087 | if (memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) { | |
1088 | key->u.aes_cmac.icverrors++; | |
1089 | return RX_DROP_UNUSABLE; | |
1090 | } | |
1091 | } | |
1092 | ||
1093 | memcpy(key->u.aes_cmac.rx_pn, ipn, 6); | |
1094 | ||
1095 | /* Remove MMIE */ | |
1096 | skb_trim(skb, skb->len - sizeof(*mmie)); | |
1097 | ||
1098 | return RX_CONTINUE; | |
1099 | } | |
1100 | ||
8ade538b JM |
1101 | ieee80211_tx_result |
1102 | ieee80211_crypto_aes_gmac_encrypt(struct ieee80211_tx_data *tx) | |
1103 | { | |
1104 | struct sk_buff *skb; | |
1105 | struct ieee80211_tx_info *info; | |
1106 | struct ieee80211_key *key = tx->key; | |
1107 | struct ieee80211_mmie_16 *mmie; | |
1108 | struct ieee80211_hdr *hdr; | |
1109 | u8 aad[20]; | |
1110 | u64 pn64; | |
1111 | u8 nonce[12]; | |
1112 | ||
1113 | if (WARN_ON(skb_queue_len(&tx->skbs) != 1)) | |
1114 | return TX_DROP; | |
1115 | ||
1116 | skb = skb_peek(&tx->skbs); | |
1117 | ||
1118 | info = IEEE80211_SKB_CB(skb); | |
1119 | ||
1120 | if (info->control.hw_key) | |
1121 | return TX_CONTINUE; | |
1122 | ||
1123 | if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie))) | |
1124 | return TX_DROP; | |
1125 | ||
1126 | mmie = (struct ieee80211_mmie_16 *)skb_put(skb, sizeof(*mmie)); | |
1127 | mmie->element_id = WLAN_EID_MMIE; | |
1128 | mmie->length = sizeof(*mmie) - 2; | |
1129 | mmie->key_id = cpu_to_le16(key->conf.keyidx); | |
1130 | ||
1131 | /* PN = PN + 1 */ | |
db388a56 | 1132 | pn64 = atomic64_inc_return(&key->conf.tx_pn); |
8ade538b JM |
1133 | |
1134 | bip_ipn_set64(mmie->sequence_number, pn64); | |
1135 | ||
1136 | bip_aad(skb, aad); | |
1137 | ||
1138 | hdr = (struct ieee80211_hdr *)skb->data; | |
1139 | memcpy(nonce, hdr->addr2, ETH_ALEN); | |
1140 | bip_ipn_swap(nonce + ETH_ALEN, mmie->sequence_number); | |
1141 | ||
1142 | /* MIC = AES-GMAC(IGTK, AAD || Management Frame Body || MMIE, 128) */ | |
1143 | if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce, | |
1144 | skb->data + 24, skb->len - 24, mmie->mic) < 0) | |
1145 | return TX_DROP; | |
1146 | ||
1147 | return TX_CONTINUE; | |
1148 | } | |
1149 | ||
1150 | ieee80211_rx_result | |
1151 | ieee80211_crypto_aes_gmac_decrypt(struct ieee80211_rx_data *rx) | |
1152 | { | |
1153 | struct sk_buff *skb = rx->skb; | |
1154 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1155 | struct ieee80211_key *key = rx->key; | |
1156 | struct ieee80211_mmie_16 *mmie; | |
1157 | u8 aad[20], mic[16], ipn[6], nonce[12]; | |
1158 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
1159 | ||
1160 | if (!ieee80211_is_mgmt(hdr->frame_control)) | |
1161 | return RX_CONTINUE; | |
1162 | ||
1163 | /* management frames are already linear */ | |
1164 | ||
1165 | if (skb->len < 24 + sizeof(*mmie)) | |
1166 | return RX_DROP_UNUSABLE; | |
1167 | ||
1168 | mmie = (struct ieee80211_mmie_16 *) | |
1169 | (skb->data + skb->len - sizeof(*mmie)); | |
1170 | if (mmie->element_id != WLAN_EID_MMIE || | |
1171 | mmie->length != sizeof(*mmie) - 2) | |
1172 | return RX_DROP_UNUSABLE; /* Invalid MMIE */ | |
1173 | ||
1174 | bip_ipn_swap(ipn, mmie->sequence_number); | |
1175 | ||
1176 | if (memcmp(ipn, key->u.aes_gmac.rx_pn, 6) <= 0) { | |
1177 | key->u.aes_gmac.replays++; | |
1178 | return RX_DROP_UNUSABLE; | |
1179 | } | |
1180 | ||
1181 | if (!(status->flag & RX_FLAG_DECRYPTED)) { | |
1182 | /* hardware didn't decrypt/verify MIC */ | |
1183 | bip_aad(skb, aad); | |
1184 | ||
1185 | memcpy(nonce, hdr->addr2, ETH_ALEN); | |
1186 | memcpy(nonce + ETH_ALEN, ipn, 6); | |
1187 | ||
1188 | if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce, | |
1189 | skb->data + 24, skb->len - 24, | |
1190 | mic) < 0 || | |
1191 | memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) { | |
1192 | key->u.aes_gmac.icverrors++; | |
1193 | return RX_DROP_UNUSABLE; | |
1194 | } | |
1195 | } | |
1196 | ||
1197 | memcpy(key->u.aes_gmac.rx_pn, ipn, 6); | |
1198 | ||
1199 | /* Remove MMIE */ | |
1200 | skb_trim(skb, skb->len - sizeof(*mmie)); | |
1201 | ||
1202 | return RX_CONTINUE; | |
1203 | } | |
1204 | ||
d32a1028 YD |
1205 | ieee80211_tx_result |
1206 | ieee80211_crypto_hw_encrypt(struct ieee80211_tx_data *tx) | |
1207 | { | |
1208 | struct sk_buff *skb; | |
1209 | struct ieee80211_tx_info *info = NULL; | |
2475b1cc | 1210 | ieee80211_tx_result res; |
d32a1028 YD |
1211 | |
1212 | skb_queue_walk(&tx->skbs, skb) { | |
1213 | info = IEEE80211_SKB_CB(skb); | |
1214 | ||
1215 | /* handle hw-only algorithm */ | |
1216 | if (!info->control.hw_key) | |
1217 | return TX_DROP; | |
2475b1cc | 1218 | |
c7ef38e0 | 1219 | if (tx->key->flags & KEY_FLAG_CIPHER_SCHEME) { |
2475b1cc MS |
1220 | res = ieee80211_crypto_cs_encrypt(tx, skb); |
1221 | if (res != TX_CONTINUE) | |
1222 | return res; | |
1223 | } | |
d32a1028 YD |
1224 | } |
1225 | ||
1226 | ieee80211_tx_set_protected(tx); | |
1227 | ||
1228 | return TX_CONTINUE; | |
1229 | } | |
2475b1cc MS |
1230 | |
1231 | ieee80211_rx_result | |
1232 | ieee80211_crypto_hw_decrypt(struct ieee80211_rx_data *rx) | |
1233 | { | |
aeb136c5 | 1234 | if (rx->sta && rx->sta->cipher_scheme) |
2475b1cc MS |
1235 | return ieee80211_crypto_cs_decrypt(rx); |
1236 | ||
1237 | return RX_DROP_UNUSABLE; | |
1238 | } |