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 | */ | |
6f1f5d5f JB |
177 | cfg80211_michael_mic_failure(rx->sdata->dev, hdr->addr2, |
178 | is_multicast_ether_addr(hdr->addr1) ? | |
179 | NL80211_KEYTYPE_GROUP : | |
180 | NL80211_KEYTYPE_PAIRWISE, | |
181 | rx->key ? rx->key->conf.keyidx : -1, | |
182 | NULL, GFP_ATOMIC); | |
816c04fe | 183 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
184 | } |
185 | ||
186 | ||
e039fa4a | 187 | static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb) |
f0706e82 JB |
188 | { |
189 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
190 | struct ieee80211_key *key = tx->key; | |
e039fa4a | 191 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
d5184cac HH |
192 | unsigned int hdrlen; |
193 | int len, tail; | |
f0706e82 JB |
194 | u8 *pos; |
195 | ||
813d7669 | 196 | if (info->control.hw_key && |
ee70108f JD |
197 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) && |
198 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) { | |
813d7669 | 199 | /* hwaccel - with no need for software-generated IV */ |
23c0752a | 200 | return 0; |
e039fa4a JB |
201 | } |
202 | ||
d5184cac | 203 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 JB |
204 | len = skb->len - hdrlen; |
205 | ||
813d7669 | 206 | if (info->control.hw_key) |
23c0752a | 207 | tail = 0; |
11a843b7 | 208 | else |
4325f6ca | 209 | tail = IEEE80211_TKIP_ICV_LEN; |
23c0752a JB |
210 | |
211 | if (WARN_ON(skb_tailroom(skb) < tail || | |
4325f6ca | 212 | skb_headroom(skb) < IEEE80211_TKIP_IV_LEN)) |
23c0752a | 213 | return -1; |
f0706e82 | 214 | |
4325f6ca JB |
215 | pos = skb_push(skb, IEEE80211_TKIP_IV_LEN); |
216 | memmove(pos, pos + IEEE80211_TKIP_IV_LEN, hdrlen); | |
f0706e82 JB |
217 | pos += hdrlen; |
218 | ||
ee70108f JD |
219 | /* the HW only needs room for the IV, but not the actual IV */ |
220 | if (info->control.hw_key && | |
221 | (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) | |
222 | return 0; | |
223 | ||
f0706e82 | 224 | /* Increase IV for the frame */ |
03395003 | 225 | spin_lock(&key->u.tkip.txlock); |
b0f76b33 HH |
226 | key->u.tkip.tx.iv16++; |
227 | if (key->u.tkip.tx.iv16 == 0) | |
228 | key->u.tkip.tx.iv32++; | |
523b02ea | 229 | pos = ieee80211_tkip_add_iv(pos, key); |
03395003 | 230 | spin_unlock(&key->u.tkip.txlock); |
f0706e82 | 231 | |
813d7669 JB |
232 | /* hwaccel - with software IV */ |
233 | if (info->control.hw_key) | |
f0706e82 | 234 | return 0; |
f0706e82 JB |
235 | |
236 | /* Add room for ICV */ | |
4325f6ca | 237 | skb_put(skb, IEEE80211_TKIP_ICV_LEN); |
f0706e82 | 238 | |
3473187d | 239 | return ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm, |
523b02ea | 240 | key, skb, pos, len); |
f0706e82 JB |
241 | } |
242 | ||
243 | ||
9ae54c84 | 244 | ieee80211_tx_result |
5cf121c3 | 245 | ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx) |
f0706e82 | 246 | { |
252b86c4 | 247 | struct sk_buff *skb; |
f0706e82 | 248 | |
5cf121c3 | 249 | ieee80211_tx_set_protected(tx); |
f0706e82 | 250 | |
252b86c4 | 251 | skb_queue_walk(&tx->skbs, skb) { |
2de8e0d9 JB |
252 | if (tkip_encrypt_skb(tx, skb) < 0) |
253 | return TX_DROP; | |
252b86c4 | 254 | } |
f0706e82 | 255 | |
9ae54c84 | 256 | return TX_CONTINUE; |
f0706e82 JB |
257 | } |
258 | ||
259 | ||
9ae54c84 | 260 | ieee80211_rx_result |
5cf121c3 | 261 | ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx) |
f0706e82 JB |
262 | { |
263 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; | |
747d753d | 264 | int hdrlen, res, hwaccel = 0; |
f0706e82 JB |
265 | struct ieee80211_key *key = rx->key; |
266 | struct sk_buff *skb = rx->skb; | |
eb9fb5b8 | 267 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
f0706e82 | 268 | |
d5184cac | 269 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 | 270 | |
c34498b9 | 271 | if (!ieee80211_is_data(hdr->frame_control)) |
9ae54c84 | 272 | return RX_CONTINUE; |
f0706e82 JB |
273 | |
274 | if (!rx->sta || skb->len - hdrlen < 12) | |
e4c26add | 275 | return RX_DROP_UNUSABLE; |
f0706e82 | 276 | |
a8286911 JB |
277 | /* it may be possible to optimize this a bit more */ |
278 | if (skb_linearize(rx->skb)) | |
279 | return RX_DROP_UNUSABLE; | |
280 | hdr = (void *)skb->data; | |
281 | ||
dc1580dd JB |
282 | /* |
283 | * Let TKIP code verify IV, but skip decryption. | |
284 | * In the case where hardware checks the IV as well, | |
285 | * we don't even get here, see ieee80211_rx_h_decrypt() | |
286 | */ | |
287 | if (status->flag & RX_FLAG_DECRYPTED) | |
f0706e82 | 288 | hwaccel = 1; |
f0706e82 JB |
289 | |
290 | res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm, | |
291 | key, skb->data + hdrlen, | |
17741cdc | 292 | skb->len - hdrlen, rx->sta->sta.addr, |
9e26297a | 293 | hdr->addr1, hwaccel, rx->security_idx, |
5cf121c3 JB |
294 | &rx->tkip_iv32, |
295 | &rx->tkip_iv16); | |
747d753d | 296 | if (res != TKIP_DECRYPT_OK) |
e4c26add | 297 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
298 | |
299 | /* Trim ICV */ | |
4325f6ca | 300 | skb_trim(skb, skb->len - IEEE80211_TKIP_ICV_LEN); |
f0706e82 JB |
301 | |
302 | /* Remove IV */ | |
4325f6ca JB |
303 | memmove(skb->data + IEEE80211_TKIP_IV_LEN, skb->data, hdrlen); |
304 | skb_pull(skb, IEEE80211_TKIP_IV_LEN); | |
f0706e82 | 305 | |
9ae54c84 | 306 | return RX_CONTINUE; |
f0706e82 JB |
307 | } |
308 | ||
309 | ||
30ef7ef9 | 310 | static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad) |
f0706e82 | 311 | { |
f14df804 | 312 | __le16 mask_fc; |
fb733336 | 313 | int a4_included, mgmt; |
f14df804 | 314 | u8 qos_tid; |
7ec7c4a9 | 315 | u16 len_a; |
f14df804 HH |
316 | unsigned int hdrlen; |
317 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
f0706e82 | 318 | |
f14df804 | 319 | /* |
fb733336 | 320 | * Mask FC: zero subtype b4 b5 b6 (if not mgmt) |
f14df804 HH |
321 | * Retry, PwrMgt, MoreData; set Protected |
322 | */ | |
fb733336 | 323 | mgmt = ieee80211_is_mgmt(hdr->frame_control); |
f14df804 | 324 | mask_fc = hdr->frame_control; |
fb733336 | 325 | mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | |
f14df804 | 326 | IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA); |
fb733336 JM |
327 | if (!mgmt) |
328 | mask_fc &= ~cpu_to_le16(0x0070); | |
f14df804 HH |
329 | mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); |
330 | ||
331 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
332 | len_a = hdrlen - 2; | |
333 | a4_included = ieee80211_has_a4(hdr->frame_control); | |
f0706e82 | 334 | |
f14df804 HH |
335 | if (ieee80211_is_data_qos(hdr->frame_control)) |
336 | qos_tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; | |
337 | else | |
338 | qos_tid = 0; | |
339 | ||
7ec7c4a9 AB |
340 | /* In CCM, the initial vectors (IV) used for CTR mode encryption and CBC |
341 | * mode authentication are not allowed to collide, yet both are derived | |
342 | * from this vector b_0. We only set L := 1 here to indicate that the | |
343 | * data size can be represented in (L+1) bytes. The CCM layer will take | |
344 | * care of storing the data length in the top (L+1) bytes and setting | |
345 | * and clearing the other bits as is required to derive the two IVs. | |
346 | */ | |
347 | b_0[0] = 0x1; | |
f14df804 | 348 | |
fb733336 JM |
349 | /* Nonce: Nonce Flags | A2 | PN |
350 | * Nonce Flags: Priority (b0..b3) | Management (b4) | Reserved (b5..b7) | |
351 | */ | |
352 | b_0[1] = qos_tid | (mgmt << 4); | |
73e1f7c8 | 353 | memcpy(&b_0[2], hdr->addr2, ETH_ALEN); |
4325f6ca | 354 | memcpy(&b_0[8], pn, IEEE80211_CCMP_PN_LEN); |
f0706e82 JB |
355 | |
356 | /* AAD (extra authenticate-only data) / masked 802.11 header | |
357 | * FC | A1 | A2 | A3 | SC | [A4] | [QC] */ | |
f14df804 HH |
358 | put_unaligned_be16(len_a, &aad[0]); |
359 | put_unaligned(mask_fc, (__le16 *)&aad[2]); | |
73e1f7c8 | 360 | memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN); |
f0706e82 JB |
361 | |
362 | /* Mask Seq#, leave Frag# */ | |
363 | aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f; | |
364 | aad[23] = 0; | |
f14df804 | 365 | |
f0706e82 | 366 | if (a4_included) { |
73e1f7c8 | 367 | memcpy(&aad[24], hdr->addr4, ETH_ALEN); |
f14df804 | 368 | aad[30] = qos_tid; |
f0706e82 | 369 | aad[31] = 0; |
f14df804 | 370 | } else { |
73e1f7c8 | 371 | memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN); |
f14df804 | 372 | aad[24] = qos_tid; |
f0706e82 JB |
373 | } |
374 | } | |
375 | ||
376 | ||
377 | static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn, int key_id) | |
378 | { | |
379 | hdr[0] = pn[5]; | |
380 | hdr[1] = pn[4]; | |
381 | hdr[2] = 0; | |
382 | hdr[3] = 0x20 | (key_id << 6); | |
383 | hdr[4] = pn[3]; | |
384 | hdr[5] = pn[2]; | |
385 | hdr[6] = pn[1]; | |
386 | hdr[7] = pn[0]; | |
387 | } | |
388 | ||
389 | ||
c6a1fa12 | 390 | static inline void ccmp_hdr2pn(u8 *pn, u8 *hdr) |
f0706e82 JB |
391 | { |
392 | pn[0] = hdr[7]; | |
393 | pn[1] = hdr[6]; | |
394 | pn[2] = hdr[5]; | |
395 | pn[3] = hdr[4]; | |
396 | pn[4] = hdr[1]; | |
397 | pn[5] = hdr[0]; | |
f0706e82 JB |
398 | } |
399 | ||
400 | ||
2b2ba0db JM |
401 | static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb, |
402 | unsigned int mic_len) | |
f0706e82 JB |
403 | { |
404 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
405 | struct ieee80211_key *key = tx->key; | |
e039fa4a | 406 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
23c0752a | 407 | int hdrlen, len, tail; |
aba83a0b JB |
408 | u8 *pos; |
409 | u8 pn[6]; | |
410 | u64 pn64; | |
7ec7c4a9 AB |
411 | u8 aad[2 * AES_BLOCK_SIZE]; |
412 | u8 b_0[AES_BLOCK_SIZE]; | |
f0706e82 | 413 | |
813d7669 | 414 | if (info->control.hw_key && |
077a9154 | 415 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) && |
17d38fa8 MK |
416 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) && |
417 | !((info->control.hw_key->flags & | |
418 | IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) && | |
419 | ieee80211_is_mgmt(hdr->frame_control))) { | |
813d7669 JB |
420 | /* |
421 | * hwaccel has no need for preallocated room for CCMP | |
422 | * header or MIC fields | |
423 | */ | |
23c0752a | 424 | return 0; |
e039fa4a JB |
425 | } |
426 | ||
d5184cac | 427 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 JB |
428 | len = skb->len - hdrlen; |
429 | ||
813d7669 | 430 | if (info->control.hw_key) |
23c0752a | 431 | tail = 0; |
11a843b7 | 432 | else |
2b2ba0db | 433 | tail = mic_len; |
23c0752a JB |
434 | |
435 | if (WARN_ON(skb_tailroom(skb) < tail || | |
4325f6ca | 436 | skb_headroom(skb) < IEEE80211_CCMP_HDR_LEN)) |
23c0752a | 437 | return -1; |
f0706e82 | 438 | |
4325f6ca JB |
439 | pos = skb_push(skb, IEEE80211_CCMP_HDR_LEN); |
440 | memmove(pos, pos + IEEE80211_CCMP_HDR_LEN, hdrlen); | |
077a9154 AN |
441 | |
442 | /* the HW only needs room for the IV, but not the actual IV */ | |
e0830f71 AN |
443 | if (info->control.hw_key && |
444 | (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) | |
077a9154 AN |
445 | return 0; |
446 | ||
f0706e82 JB |
447 | hdr = (struct ieee80211_hdr *) pos; |
448 | pos += hdrlen; | |
449 | ||
db388a56 | 450 | pn64 = atomic64_inc_return(&key->conf.tx_pn); |
f0706e82 | 451 | |
aba83a0b JB |
452 | pn[5] = pn64; |
453 | pn[4] = pn64 >> 8; | |
454 | pn[3] = pn64 >> 16; | |
455 | pn[2] = pn64 >> 24; | |
456 | pn[1] = pn64 >> 32; | |
457 | pn[0] = pn64 >> 40; | |
f0706e82 | 458 | |
8f20fc24 | 459 | ccmp_pn2hdr(pos, pn, key->conf.keyidx); |
f0706e82 | 460 | |
813d7669 JB |
461 | /* hwaccel - with software CCMP header */ |
462 | if (info->control.hw_key) | |
f0706e82 | 463 | return 0; |
f0706e82 | 464 | |
4325f6ca | 465 | pos += IEEE80211_CCMP_HDR_LEN; |
30ef7ef9 | 466 | ccmp_special_blocks(skb, pn, b_0, aad); |
7ec7c4a9 | 467 | ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, b_0, aad, pos, len, |
2b2ba0db | 468 | skb_put(skb, mic_len), mic_len); |
f0706e82 JB |
469 | |
470 | return 0; | |
471 | } | |
472 | ||
473 | ||
9ae54c84 | 474 | ieee80211_tx_result |
2b2ba0db JM |
475 | ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx, |
476 | unsigned int mic_len) | |
f0706e82 | 477 | { |
252b86c4 | 478 | struct sk_buff *skb; |
f0706e82 | 479 | |
5cf121c3 | 480 | ieee80211_tx_set_protected(tx); |
f0706e82 | 481 | |
252b86c4 | 482 | skb_queue_walk(&tx->skbs, skb) { |
2b2ba0db | 483 | if (ccmp_encrypt_skb(tx, skb, mic_len) < 0) |
2de8e0d9 | 484 | return TX_DROP; |
252b86c4 | 485 | } |
f0706e82 | 486 | |
9ae54c84 | 487 | return TX_CONTINUE; |
f0706e82 JB |
488 | } |
489 | ||
490 | ||
9ae54c84 | 491 | ieee80211_rx_result |
2b2ba0db JM |
492 | ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx, |
493 | unsigned int mic_len) | |
f0706e82 | 494 | { |
c34498b9 | 495 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
f0706e82 JB |
496 | int hdrlen; |
497 | struct ieee80211_key *key = rx->key; | |
498 | struct sk_buff *skb = rx->skb; | |
eb9fb5b8 | 499 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
4325f6ca | 500 | u8 pn[IEEE80211_CCMP_PN_LEN]; |
f0706e82 | 501 | int data_len; |
9190252c | 502 | int queue; |
f0706e82 | 503 | |
d5184cac | 504 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 | 505 | |
fb733336 | 506 | if (!ieee80211_is_data(hdr->frame_control) && |
d8ca16db | 507 | !ieee80211_is_robust_mgmt_frame(skb)) |
9ae54c84 | 508 | return RX_CONTINUE; |
f0706e82 | 509 | |
2b2ba0db | 510 | data_len = skb->len - hdrlen - IEEE80211_CCMP_HDR_LEN - mic_len; |
f0706e82 | 511 | if (!rx->sta || data_len < 0) |
e4c26add | 512 | return RX_DROP_UNUSABLE; |
f0706e82 | 513 | |
a8286911 | 514 | if (status->flag & RX_FLAG_DECRYPTED) { |
4325f6ca | 515 | if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_CCMP_HDR_LEN)) |
a8286911 JB |
516 | return RX_DROP_UNUSABLE; |
517 | } else { | |
518 | if (skb_linearize(rx->skb)) | |
519 | return RX_DROP_UNUSABLE; | |
520 | } | |
521 | ||
981d94a8 JB |
522 | if (!(status->flag & RX_FLAG_PN_VALIDATED)) { |
523 | ccmp_hdr2pn(pn, skb->data + hdrlen); | |
f0706e82 | 524 | |
981d94a8 | 525 | queue = rx->security_idx; |
9190252c | 526 | |
981d94a8 JB |
527 | if (memcmp(pn, key->u.ccmp.rx_pn[queue], |
528 | IEEE80211_CCMP_PN_LEN) <= 0) { | |
529 | key->u.ccmp.replays++; | |
e4c26add | 530 | return RX_DROP_UNUSABLE; |
981d94a8 JB |
531 | } |
532 | ||
533 | if (!(status->flag & RX_FLAG_DECRYPTED)) { | |
534 | u8 aad[2 * AES_BLOCK_SIZE]; | |
535 | u8 b_0[AES_BLOCK_SIZE]; | |
536 | /* hardware didn't decrypt/verify MIC */ | |
537 | ccmp_special_blocks(skb, pn, b_0, aad); | |
538 | ||
539 | if (ieee80211_aes_ccm_decrypt( | |
540 | key->u.ccmp.tfm, b_0, aad, | |
541 | skb->data + hdrlen + IEEE80211_CCMP_HDR_LEN, | |
542 | data_len, | |
543 | skb->data + skb->len - mic_len, mic_len)) | |
544 | return RX_DROP_UNUSABLE; | |
545 | } | |
546 | ||
547 | memcpy(key->u.ccmp.rx_pn[queue], pn, IEEE80211_CCMP_PN_LEN); | |
f0706e82 JB |
548 | } |
549 | ||
f0706e82 | 550 | /* Remove CCMP header and MIC */ |
2b2ba0db | 551 | if (pskb_trim(skb, skb->len - mic_len)) |
a8286911 | 552 | return RX_DROP_UNUSABLE; |
4325f6ca JB |
553 | memmove(skb->data + IEEE80211_CCMP_HDR_LEN, skb->data, hdrlen); |
554 | skb_pull(skb, IEEE80211_CCMP_HDR_LEN); | |
f0706e82 | 555 | |
9ae54c84 | 556 | return RX_CONTINUE; |
f0706e82 | 557 | } |
765cb46a | 558 | |
00b9cfa3 JM |
559 | static void gcmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *j_0, u8 *aad) |
560 | { | |
561 | __le16 mask_fc; | |
562 | u8 qos_tid; | |
563 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
564 | ||
565 | memcpy(j_0, hdr->addr2, ETH_ALEN); | |
566 | memcpy(&j_0[ETH_ALEN], pn, IEEE80211_GCMP_PN_LEN); | |
567 | j_0[13] = 0; | |
568 | j_0[14] = 0; | |
569 | j_0[AES_BLOCK_SIZE - 1] = 0x01; | |
570 | ||
571 | /* AAD (extra authenticate-only data) / masked 802.11 header | |
572 | * FC | A1 | A2 | A3 | SC | [A4] | [QC] | |
573 | */ | |
574 | put_unaligned_be16(ieee80211_hdrlen(hdr->frame_control) - 2, &aad[0]); | |
575 | /* Mask FC: zero subtype b4 b5 b6 (if not mgmt) | |
576 | * Retry, PwrMgt, MoreData; set Protected | |
577 | */ | |
578 | mask_fc = hdr->frame_control; | |
579 | mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | | |
580 | IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA); | |
581 | if (!ieee80211_is_mgmt(hdr->frame_control)) | |
582 | mask_fc &= ~cpu_to_le16(0x0070); | |
583 | mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); | |
584 | ||
585 | put_unaligned(mask_fc, (__le16 *)&aad[2]); | |
586 | memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN); | |
587 | ||
588 | /* Mask Seq#, leave Frag# */ | |
589 | aad[22] = *((u8 *)&hdr->seq_ctrl) & 0x0f; | |
590 | aad[23] = 0; | |
591 | ||
592 | if (ieee80211_is_data_qos(hdr->frame_control)) | |
593 | qos_tid = *ieee80211_get_qos_ctl(hdr) & | |
594 | IEEE80211_QOS_CTL_TID_MASK; | |
595 | else | |
596 | qos_tid = 0; | |
597 | ||
598 | if (ieee80211_has_a4(hdr->frame_control)) { | |
599 | memcpy(&aad[24], hdr->addr4, ETH_ALEN); | |
600 | aad[30] = qos_tid; | |
601 | aad[31] = 0; | |
602 | } else { | |
603 | memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN); | |
604 | aad[24] = qos_tid; | |
605 | } | |
606 | } | |
607 | ||
608 | static inline void gcmp_pn2hdr(u8 *hdr, const u8 *pn, int key_id) | |
609 | { | |
610 | hdr[0] = pn[5]; | |
611 | hdr[1] = pn[4]; | |
612 | hdr[2] = 0; | |
613 | hdr[3] = 0x20 | (key_id << 6); | |
614 | hdr[4] = pn[3]; | |
615 | hdr[5] = pn[2]; | |
616 | hdr[6] = pn[1]; | |
617 | hdr[7] = pn[0]; | |
618 | } | |
619 | ||
620 | static inline void gcmp_hdr2pn(u8 *pn, const u8 *hdr) | |
621 | { | |
622 | pn[0] = hdr[7]; | |
623 | pn[1] = hdr[6]; | |
624 | pn[2] = hdr[5]; | |
625 | pn[3] = hdr[4]; | |
626 | pn[4] = hdr[1]; | |
627 | pn[5] = hdr[0]; | |
628 | } | |
629 | ||
630 | static int gcmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb) | |
631 | { | |
632 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
633 | struct ieee80211_key *key = tx->key; | |
634 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
635 | int hdrlen, len, tail; | |
636 | u8 *pos; | |
637 | u8 pn[6]; | |
638 | u64 pn64; | |
639 | u8 aad[2 * AES_BLOCK_SIZE]; | |
640 | u8 j_0[AES_BLOCK_SIZE]; | |
641 | ||
642 | if (info->control.hw_key && | |
643 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) && | |
644 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) && | |
645 | !((info->control.hw_key->flags & | |
646 | IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) && | |
647 | ieee80211_is_mgmt(hdr->frame_control))) { | |
648 | /* hwaccel has no need for preallocated room for GCMP | |
649 | * header or MIC fields | |
650 | */ | |
651 | return 0; | |
652 | } | |
653 | ||
654 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
655 | len = skb->len - hdrlen; | |
656 | ||
657 | if (info->control.hw_key) | |
658 | tail = 0; | |
659 | else | |
660 | tail = IEEE80211_GCMP_MIC_LEN; | |
661 | ||
662 | if (WARN_ON(skb_tailroom(skb) < tail || | |
663 | skb_headroom(skb) < IEEE80211_GCMP_HDR_LEN)) | |
664 | return -1; | |
665 | ||
666 | pos = skb_push(skb, IEEE80211_GCMP_HDR_LEN); | |
667 | memmove(pos, pos + IEEE80211_GCMP_HDR_LEN, hdrlen); | |
668 | skb_set_network_header(skb, skb_network_offset(skb) + | |
669 | IEEE80211_GCMP_HDR_LEN); | |
670 | ||
671 | /* the HW only needs room for the IV, but not the actual IV */ | |
672 | if (info->control.hw_key && | |
673 | (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) | |
674 | return 0; | |
675 | ||
676 | hdr = (struct ieee80211_hdr *)pos; | |
677 | pos += hdrlen; | |
678 | ||
db388a56 | 679 | pn64 = atomic64_inc_return(&key->conf.tx_pn); |
00b9cfa3 JM |
680 | |
681 | pn[5] = pn64; | |
682 | pn[4] = pn64 >> 8; | |
683 | pn[3] = pn64 >> 16; | |
684 | pn[2] = pn64 >> 24; | |
685 | pn[1] = pn64 >> 32; | |
686 | pn[0] = pn64 >> 40; | |
687 | ||
688 | gcmp_pn2hdr(pos, pn, key->conf.keyidx); | |
689 | ||
690 | /* hwaccel - with software GCMP header */ | |
691 | if (info->control.hw_key) | |
692 | return 0; | |
693 | ||
694 | pos += IEEE80211_GCMP_HDR_LEN; | |
695 | gcmp_special_blocks(skb, pn, j_0, aad); | |
696 | ieee80211_aes_gcm_encrypt(key->u.gcmp.tfm, j_0, aad, pos, len, | |
697 | skb_put(skb, IEEE80211_GCMP_MIC_LEN)); | |
698 | ||
699 | return 0; | |
700 | } | |
701 | ||
702 | ieee80211_tx_result | |
703 | ieee80211_crypto_gcmp_encrypt(struct ieee80211_tx_data *tx) | |
704 | { | |
705 | struct sk_buff *skb; | |
706 | ||
707 | ieee80211_tx_set_protected(tx); | |
708 | ||
709 | skb_queue_walk(&tx->skbs, skb) { | |
710 | if (gcmp_encrypt_skb(tx, skb) < 0) | |
711 | return TX_DROP; | |
712 | } | |
713 | ||
714 | return TX_CONTINUE; | |
715 | } | |
716 | ||
717 | ieee80211_rx_result | |
718 | ieee80211_crypto_gcmp_decrypt(struct ieee80211_rx_data *rx) | |
719 | { | |
720 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; | |
721 | int hdrlen; | |
722 | struct ieee80211_key *key = rx->key; | |
723 | struct sk_buff *skb = rx->skb; | |
724 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
725 | u8 pn[IEEE80211_GCMP_PN_LEN]; | |
726 | int data_len; | |
727 | int queue; | |
728 | ||
729 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
730 | ||
731 | if (!ieee80211_is_data(hdr->frame_control) && | |
732 | !ieee80211_is_robust_mgmt_frame(skb)) | |
733 | return RX_CONTINUE; | |
734 | ||
735 | data_len = skb->len - hdrlen - IEEE80211_GCMP_HDR_LEN - | |
736 | IEEE80211_GCMP_MIC_LEN; | |
737 | if (!rx->sta || data_len < 0) | |
738 | return RX_DROP_UNUSABLE; | |
739 | ||
740 | if (status->flag & RX_FLAG_DECRYPTED) { | |
741 | if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_GCMP_HDR_LEN)) | |
742 | return RX_DROP_UNUSABLE; | |
743 | } else { | |
744 | if (skb_linearize(rx->skb)) | |
745 | return RX_DROP_UNUSABLE; | |
746 | } | |
747 | ||
981d94a8 JB |
748 | if (!(status->flag & RX_FLAG_PN_VALIDATED)) { |
749 | gcmp_hdr2pn(pn, skb->data + hdrlen); | |
00b9cfa3 | 750 | |
981d94a8 | 751 | queue = rx->security_idx; |
00b9cfa3 | 752 | |
981d94a8 JB |
753 | if (memcmp(pn, key->u.gcmp.rx_pn[queue], |
754 | IEEE80211_GCMP_PN_LEN) <= 0) { | |
755 | key->u.gcmp.replays++; | |
00b9cfa3 | 756 | return RX_DROP_UNUSABLE; |
981d94a8 JB |
757 | } |
758 | ||
759 | if (!(status->flag & RX_FLAG_DECRYPTED)) { | |
760 | u8 aad[2 * AES_BLOCK_SIZE]; | |
761 | u8 j_0[AES_BLOCK_SIZE]; | |
762 | /* hardware didn't decrypt/verify MIC */ | |
763 | gcmp_special_blocks(skb, pn, j_0, aad); | |
764 | ||
765 | if (ieee80211_aes_gcm_decrypt( | |
766 | key->u.gcmp.tfm, j_0, aad, | |
767 | skb->data + hdrlen + IEEE80211_GCMP_HDR_LEN, | |
768 | data_len, | |
769 | skb->data + skb->len - | |
770 | IEEE80211_GCMP_MIC_LEN)) | |
771 | return RX_DROP_UNUSABLE; | |
772 | } | |
773 | ||
774 | memcpy(key->u.gcmp.rx_pn[queue], pn, IEEE80211_GCMP_PN_LEN); | |
00b9cfa3 JM |
775 | } |
776 | ||
00b9cfa3 JM |
777 | /* Remove GCMP header and MIC */ |
778 | if (pskb_trim(skb, skb->len - IEEE80211_GCMP_MIC_LEN)) | |
779 | return RX_DROP_UNUSABLE; | |
780 | memmove(skb->data + IEEE80211_GCMP_HDR_LEN, skb->data, hdrlen); | |
781 | skb_pull(skb, IEEE80211_GCMP_HDR_LEN); | |
782 | ||
783 | return RX_CONTINUE; | |
784 | } | |
785 | ||
2475b1cc MS |
786 | static ieee80211_tx_result |
787 | ieee80211_crypto_cs_encrypt(struct ieee80211_tx_data *tx, | |
788 | struct sk_buff *skb) | |
789 | { | |
790 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
791 | struct ieee80211_key *key = tx->key; | |
792 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
2475b1cc | 793 | int hdrlen; |
c7ef38e0 | 794 | u8 *pos, iv_len = key->conf.iv_len; |
2475b1cc MS |
795 | |
796 | if (info->control.hw_key && | |
797 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) { | |
798 | /* hwaccel has no need for preallocated head room */ | |
799 | return TX_CONTINUE; | |
800 | } | |
801 | ||
c7ef38e0 CI |
802 | if (unlikely(skb_headroom(skb) < iv_len && |
803 | pskb_expand_head(skb, iv_len, 0, GFP_ATOMIC))) | |
2475b1cc MS |
804 | return TX_DROP; |
805 | ||
806 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
807 | ||
c7ef38e0 CI |
808 | pos = skb_push(skb, iv_len); |
809 | memmove(pos, pos + iv_len, hdrlen); | |
2475b1cc MS |
810 | |
811 | return TX_CONTINUE; | |
812 | } | |
813 | ||
814 | static inline int ieee80211_crypto_cs_pn_compare(u8 *pn1, u8 *pn2, int len) | |
815 | { | |
816 | int i; | |
817 | ||
818 | /* pn is little endian */ | |
819 | for (i = len - 1; i >= 0; i--) { | |
820 | if (pn1[i] < pn2[i]) | |
821 | return -1; | |
822 | else if (pn1[i] > pn2[i]) | |
823 | return 1; | |
824 | } | |
825 | ||
826 | return 0; | |
827 | } | |
828 | ||
829 | static ieee80211_rx_result | |
830 | ieee80211_crypto_cs_decrypt(struct ieee80211_rx_data *rx) | |
831 | { | |
832 | struct ieee80211_key *key = rx->key; | |
833 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; | |
834 | const struct ieee80211_cipher_scheme *cs = NULL; | |
835 | int hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
836 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); | |
837 | int data_len; | |
838 | u8 *rx_pn; | |
839 | u8 *skb_pn; | |
840 | u8 qos_tid; | |
841 | ||
842 | if (!rx->sta || !rx->sta->cipher_scheme || | |
843 | !(status->flag & RX_FLAG_DECRYPTED)) | |
844 | return RX_DROP_UNUSABLE; | |
845 | ||
846 | if (!ieee80211_is_data(hdr->frame_control)) | |
847 | return RX_CONTINUE; | |
848 | ||
849 | cs = rx->sta->cipher_scheme; | |
850 | ||
851 | data_len = rx->skb->len - hdrlen - cs->hdr_len; | |
852 | ||
853 | if (data_len < 0) | |
854 | return RX_DROP_UNUSABLE; | |
855 | ||
856 | if (ieee80211_is_data_qos(hdr->frame_control)) | |
857 | qos_tid = *ieee80211_get_qos_ctl(hdr) & | |
858 | IEEE80211_QOS_CTL_TID_MASK; | |
859 | else | |
860 | qos_tid = 0; | |
861 | ||
862 | if (skb_linearize(rx->skb)) | |
863 | return RX_DROP_UNUSABLE; | |
864 | ||
865 | hdr = (struct ieee80211_hdr *)rx->skb->data; | |
866 | ||
867 | rx_pn = key->u.gen.rx_pn[qos_tid]; | |
868 | skb_pn = rx->skb->data + hdrlen + cs->pn_off; | |
869 | ||
870 | if (ieee80211_crypto_cs_pn_compare(skb_pn, rx_pn, cs->pn_len) <= 0) | |
871 | return RX_DROP_UNUSABLE; | |
872 | ||
873 | memcpy(rx_pn, skb_pn, cs->pn_len); | |
874 | ||
875 | /* remove security header and MIC */ | |
876 | if (pskb_trim(rx->skb, rx->skb->len - cs->mic_len)) | |
877 | return RX_DROP_UNUSABLE; | |
878 | ||
879 | memmove(rx->skb->data + cs->hdr_len, rx->skb->data, hdrlen); | |
880 | skb_pull(rx->skb, cs->hdr_len); | |
881 | ||
882 | return RX_CONTINUE; | |
883 | } | |
765cb46a JM |
884 | |
885 | static void bip_aad(struct sk_buff *skb, u8 *aad) | |
886 | { | |
33766368 JM |
887 | __le16 mask_fc; |
888 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
889 | ||
765cb46a JM |
890 | /* BIP AAD: FC(masked) || A1 || A2 || A3 */ |
891 | ||
892 | /* FC type/subtype */ | |
765cb46a | 893 | /* Mask FC Retry, PwrMgt, MoreData flags to zero */ |
33766368 JM |
894 | mask_fc = hdr->frame_control; |
895 | mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | IEEE80211_FCTL_PM | | |
896 | IEEE80211_FCTL_MOREDATA); | |
897 | put_unaligned(mask_fc, (__le16 *) &aad[0]); | |
765cb46a | 898 | /* A1 || A2 || A3 */ |
33766368 | 899 | memcpy(aad + 2, &hdr->addr1, 3 * ETH_ALEN); |
765cb46a JM |
900 | } |
901 | ||
902 | ||
75396ae6 JB |
903 | static inline void bip_ipn_set64(u8 *d, u64 pn) |
904 | { | |
905 | *d++ = pn; | |
906 | *d++ = pn >> 8; | |
907 | *d++ = pn >> 16; | |
908 | *d++ = pn >> 24; | |
909 | *d++ = pn >> 32; | |
910 | *d = pn >> 40; | |
911 | } | |
912 | ||
765cb46a JM |
913 | static inline void bip_ipn_swap(u8 *d, const u8 *s) |
914 | { | |
915 | *d++ = s[5]; | |
916 | *d++ = s[4]; | |
917 | *d++ = s[3]; | |
918 | *d++ = s[2]; | |
919 | *d++ = s[1]; | |
920 | *d = s[0]; | |
921 | } | |
922 | ||
923 | ||
924 | ieee80211_tx_result | |
925 | ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx) | |
926 | { | |
252b86c4 JB |
927 | struct sk_buff *skb; |
928 | struct ieee80211_tx_info *info; | |
765cb46a JM |
929 | struct ieee80211_key *key = tx->key; |
930 | struct ieee80211_mmie *mmie; | |
75396ae6 JB |
931 | u8 aad[20]; |
932 | u64 pn64; | |
765cb46a | 933 | |
252b86c4 JB |
934 | if (WARN_ON(skb_queue_len(&tx->skbs) != 1)) |
935 | return TX_DROP; | |
936 | ||
937 | skb = skb_peek(&tx->skbs); | |
938 | ||
939 | info = IEEE80211_SKB_CB(skb); | |
940 | ||
813d7669 | 941 | if (info->control.hw_key) |
252b86c4 | 942 | return TX_CONTINUE; |
765cb46a JM |
943 | |
944 | if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie))) | |
945 | return TX_DROP; | |
946 | ||
947 | mmie = (struct ieee80211_mmie *) skb_put(skb, sizeof(*mmie)); | |
948 | mmie->element_id = WLAN_EID_MMIE; | |
949 | mmie->length = sizeof(*mmie) - 2; | |
950 | mmie->key_id = cpu_to_le16(key->conf.keyidx); | |
951 | ||
952 | /* PN = PN + 1 */ | |
db388a56 | 953 | pn64 = atomic64_inc_return(&key->conf.tx_pn); |
765cb46a | 954 | |
75396ae6 | 955 | bip_ipn_set64(mmie->sequence_number, pn64); |
765cb46a JM |
956 | |
957 | bip_aad(skb, aad); | |
958 | ||
959 | /* | |
960 | * MIC = AES-128-CMAC(IGTK, AAD || Management Frame Body || MMIE, 64) | |
961 | */ | |
75396ae6 JB |
962 | ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad, |
963 | skb->data + 24, skb->len - 24, mmie->mic); | |
765cb46a JM |
964 | |
965 | return TX_CONTINUE; | |
966 | } | |
967 | ||
56c52da2 JM |
968 | ieee80211_tx_result |
969 | ieee80211_crypto_aes_cmac_256_encrypt(struct ieee80211_tx_data *tx) | |
970 | { | |
971 | struct sk_buff *skb; | |
972 | struct ieee80211_tx_info *info; | |
973 | struct ieee80211_key *key = tx->key; | |
974 | struct ieee80211_mmie_16 *mmie; | |
975 | u8 aad[20]; | |
976 | u64 pn64; | |
977 | ||
978 | if (WARN_ON(skb_queue_len(&tx->skbs) != 1)) | |
979 | return TX_DROP; | |
980 | ||
981 | skb = skb_peek(&tx->skbs); | |
982 | ||
983 | info = IEEE80211_SKB_CB(skb); | |
984 | ||
985 | if (info->control.hw_key) | |
986 | return TX_CONTINUE; | |
987 | ||
988 | if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie))) | |
989 | return TX_DROP; | |
990 | ||
991 | mmie = (struct ieee80211_mmie_16 *)skb_put(skb, sizeof(*mmie)); | |
992 | mmie->element_id = WLAN_EID_MMIE; | |
993 | mmie->length = sizeof(*mmie) - 2; | |
994 | mmie->key_id = cpu_to_le16(key->conf.keyidx); | |
995 | ||
996 | /* PN = PN + 1 */ | |
db388a56 | 997 | pn64 = atomic64_inc_return(&key->conf.tx_pn); |
56c52da2 JM |
998 | |
999 | bip_ipn_set64(mmie->sequence_number, pn64); | |
1000 | ||
1001 | bip_aad(skb, aad); | |
1002 | ||
1003 | /* MIC = AES-256-CMAC(IGTK, AAD || Management Frame Body || MMIE, 128) | |
1004 | */ | |
1005 | ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad, | |
1006 | skb->data + 24, skb->len - 24, mmie->mic); | |
1007 | ||
1008 | return TX_CONTINUE; | |
1009 | } | |
765cb46a JM |
1010 | |
1011 | ieee80211_rx_result | |
1012 | ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx) | |
1013 | { | |
1014 | struct sk_buff *skb = rx->skb; | |
eb9fb5b8 | 1015 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
765cb46a JM |
1016 | struct ieee80211_key *key = rx->key; |
1017 | struct ieee80211_mmie *mmie; | |
1018 | u8 aad[20], mic[8], ipn[6]; | |
1019 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
1020 | ||
1021 | if (!ieee80211_is_mgmt(hdr->frame_control)) | |
1022 | return RX_CONTINUE; | |
1023 | ||
a8286911 JB |
1024 | /* management frames are already linear */ |
1025 | ||
765cb46a JM |
1026 | if (skb->len < 24 + sizeof(*mmie)) |
1027 | return RX_DROP_UNUSABLE; | |
1028 | ||
1029 | mmie = (struct ieee80211_mmie *) | |
1030 | (skb->data + skb->len - sizeof(*mmie)); | |
1031 | if (mmie->element_id != WLAN_EID_MMIE || | |
1032 | mmie->length != sizeof(*mmie) - 2) | |
1033 | return RX_DROP_UNUSABLE; /* Invalid MMIE */ | |
1034 | ||
1035 | bip_ipn_swap(ipn, mmie->sequence_number); | |
1036 | ||
1037 | if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) { | |
1038 | key->u.aes_cmac.replays++; | |
1039 | return RX_DROP_UNUSABLE; | |
1040 | } | |
1041 | ||
eb9fb5b8 | 1042 | if (!(status->flag & RX_FLAG_DECRYPTED)) { |
765cb46a JM |
1043 | /* hardware didn't decrypt/verify MIC */ |
1044 | bip_aad(skb, aad); | |
75396ae6 | 1045 | ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad, |
765cb46a JM |
1046 | skb->data + 24, skb->len - 24, mic); |
1047 | if (memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) { | |
1048 | key->u.aes_cmac.icverrors++; | |
1049 | return RX_DROP_UNUSABLE; | |
1050 | } | |
1051 | } | |
1052 | ||
1053 | memcpy(key->u.aes_cmac.rx_pn, ipn, 6); | |
1054 | ||
1055 | /* Remove MMIE */ | |
1056 | skb_trim(skb, skb->len - sizeof(*mmie)); | |
1057 | ||
1058 | return RX_CONTINUE; | |
1059 | } | |
d32a1028 | 1060 | |
56c52da2 JM |
1061 | ieee80211_rx_result |
1062 | ieee80211_crypto_aes_cmac_256_decrypt(struct ieee80211_rx_data *rx) | |
1063 | { | |
1064 | struct sk_buff *skb = rx->skb; | |
1065 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1066 | struct ieee80211_key *key = rx->key; | |
1067 | struct ieee80211_mmie_16 *mmie; | |
1068 | u8 aad[20], mic[16], ipn[6]; | |
1069 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
1070 | ||
1071 | if (!ieee80211_is_mgmt(hdr->frame_control)) | |
1072 | return RX_CONTINUE; | |
1073 | ||
1074 | /* management frames are already linear */ | |
1075 | ||
1076 | if (skb->len < 24 + sizeof(*mmie)) | |
1077 | return RX_DROP_UNUSABLE; | |
1078 | ||
1079 | mmie = (struct ieee80211_mmie_16 *) | |
1080 | (skb->data + skb->len - sizeof(*mmie)); | |
1081 | if (mmie->element_id != WLAN_EID_MMIE || | |
1082 | mmie->length != sizeof(*mmie) - 2) | |
1083 | return RX_DROP_UNUSABLE; /* Invalid MMIE */ | |
1084 | ||
1085 | bip_ipn_swap(ipn, mmie->sequence_number); | |
1086 | ||
1087 | if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) { | |
1088 | key->u.aes_cmac.replays++; | |
1089 | return RX_DROP_UNUSABLE; | |
1090 | } | |
1091 | ||
1092 | if (!(status->flag & RX_FLAG_DECRYPTED)) { | |
1093 | /* hardware didn't decrypt/verify MIC */ | |
1094 | bip_aad(skb, aad); | |
1095 | ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad, | |
1096 | skb->data + 24, skb->len - 24, mic); | |
1097 | if (memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) { | |
1098 | key->u.aes_cmac.icverrors++; | |
1099 | return RX_DROP_UNUSABLE; | |
1100 | } | |
1101 | } | |
1102 | ||
1103 | memcpy(key->u.aes_cmac.rx_pn, ipn, 6); | |
1104 | ||
1105 | /* Remove MMIE */ | |
1106 | skb_trim(skb, skb->len - sizeof(*mmie)); | |
1107 | ||
1108 | return RX_CONTINUE; | |
1109 | } | |
1110 | ||
8ade538b JM |
1111 | ieee80211_tx_result |
1112 | ieee80211_crypto_aes_gmac_encrypt(struct ieee80211_tx_data *tx) | |
1113 | { | |
1114 | struct sk_buff *skb; | |
1115 | struct ieee80211_tx_info *info; | |
1116 | struct ieee80211_key *key = tx->key; | |
1117 | struct ieee80211_mmie_16 *mmie; | |
1118 | struct ieee80211_hdr *hdr; | |
1119 | u8 aad[20]; | |
1120 | u64 pn64; | |
1121 | u8 nonce[12]; | |
1122 | ||
1123 | if (WARN_ON(skb_queue_len(&tx->skbs) != 1)) | |
1124 | return TX_DROP; | |
1125 | ||
1126 | skb = skb_peek(&tx->skbs); | |
1127 | ||
1128 | info = IEEE80211_SKB_CB(skb); | |
1129 | ||
1130 | if (info->control.hw_key) | |
1131 | return TX_CONTINUE; | |
1132 | ||
1133 | if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie))) | |
1134 | return TX_DROP; | |
1135 | ||
1136 | mmie = (struct ieee80211_mmie_16 *)skb_put(skb, sizeof(*mmie)); | |
1137 | mmie->element_id = WLAN_EID_MMIE; | |
1138 | mmie->length = sizeof(*mmie) - 2; | |
1139 | mmie->key_id = cpu_to_le16(key->conf.keyidx); | |
1140 | ||
1141 | /* PN = PN + 1 */ | |
db388a56 | 1142 | pn64 = atomic64_inc_return(&key->conf.tx_pn); |
8ade538b JM |
1143 | |
1144 | bip_ipn_set64(mmie->sequence_number, pn64); | |
1145 | ||
1146 | bip_aad(skb, aad); | |
1147 | ||
1148 | hdr = (struct ieee80211_hdr *)skb->data; | |
1149 | memcpy(nonce, hdr->addr2, ETH_ALEN); | |
1150 | bip_ipn_swap(nonce + ETH_ALEN, mmie->sequence_number); | |
1151 | ||
1152 | /* MIC = AES-GMAC(IGTK, AAD || Management Frame Body || MMIE, 128) */ | |
1153 | if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce, | |
1154 | skb->data + 24, skb->len - 24, mmie->mic) < 0) | |
1155 | return TX_DROP; | |
1156 | ||
1157 | return TX_CONTINUE; | |
1158 | } | |
1159 | ||
1160 | ieee80211_rx_result | |
1161 | ieee80211_crypto_aes_gmac_decrypt(struct ieee80211_rx_data *rx) | |
1162 | { | |
1163 | struct sk_buff *skb = rx->skb; | |
1164 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | |
1165 | struct ieee80211_key *key = rx->key; | |
1166 | struct ieee80211_mmie_16 *mmie; | |
1167 | u8 aad[20], mic[16], ipn[6], nonce[12]; | |
1168 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
1169 | ||
1170 | if (!ieee80211_is_mgmt(hdr->frame_control)) | |
1171 | return RX_CONTINUE; | |
1172 | ||
1173 | /* management frames are already linear */ | |
1174 | ||
1175 | if (skb->len < 24 + sizeof(*mmie)) | |
1176 | return RX_DROP_UNUSABLE; | |
1177 | ||
1178 | mmie = (struct ieee80211_mmie_16 *) | |
1179 | (skb->data + skb->len - sizeof(*mmie)); | |
1180 | if (mmie->element_id != WLAN_EID_MMIE || | |
1181 | mmie->length != sizeof(*mmie) - 2) | |
1182 | return RX_DROP_UNUSABLE; /* Invalid MMIE */ | |
1183 | ||
1184 | bip_ipn_swap(ipn, mmie->sequence_number); | |
1185 | ||
1186 | if (memcmp(ipn, key->u.aes_gmac.rx_pn, 6) <= 0) { | |
1187 | key->u.aes_gmac.replays++; | |
1188 | return RX_DROP_UNUSABLE; | |
1189 | } | |
1190 | ||
1191 | if (!(status->flag & RX_FLAG_DECRYPTED)) { | |
1192 | /* hardware didn't decrypt/verify MIC */ | |
1193 | bip_aad(skb, aad); | |
1194 | ||
1195 | memcpy(nonce, hdr->addr2, ETH_ALEN); | |
1196 | memcpy(nonce + ETH_ALEN, ipn, 6); | |
1197 | ||
1198 | if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce, | |
1199 | skb->data + 24, skb->len - 24, | |
1200 | mic) < 0 || | |
1201 | memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) { | |
1202 | key->u.aes_gmac.icverrors++; | |
1203 | return RX_DROP_UNUSABLE; | |
1204 | } | |
1205 | } | |
1206 | ||
1207 | memcpy(key->u.aes_gmac.rx_pn, ipn, 6); | |
1208 | ||
1209 | /* Remove MMIE */ | |
1210 | skb_trim(skb, skb->len - sizeof(*mmie)); | |
1211 | ||
1212 | return RX_CONTINUE; | |
1213 | } | |
1214 | ||
d32a1028 YD |
1215 | ieee80211_tx_result |
1216 | ieee80211_crypto_hw_encrypt(struct ieee80211_tx_data *tx) | |
1217 | { | |
1218 | struct sk_buff *skb; | |
1219 | struct ieee80211_tx_info *info = NULL; | |
2475b1cc | 1220 | ieee80211_tx_result res; |
d32a1028 YD |
1221 | |
1222 | skb_queue_walk(&tx->skbs, skb) { | |
1223 | info = IEEE80211_SKB_CB(skb); | |
1224 | ||
1225 | /* handle hw-only algorithm */ | |
1226 | if (!info->control.hw_key) | |
1227 | return TX_DROP; | |
2475b1cc | 1228 | |
c7ef38e0 | 1229 | if (tx->key->flags & KEY_FLAG_CIPHER_SCHEME) { |
2475b1cc MS |
1230 | res = ieee80211_crypto_cs_encrypt(tx, skb); |
1231 | if (res != TX_CONTINUE) | |
1232 | return res; | |
1233 | } | |
d32a1028 YD |
1234 | } |
1235 | ||
1236 | ieee80211_tx_set_protected(tx); | |
1237 | ||
1238 | return TX_CONTINUE; | |
1239 | } | |
2475b1cc MS |
1240 | |
1241 | ieee80211_rx_result | |
1242 | ieee80211_crypto_hw_decrypt(struct ieee80211_rx_data *rx) | |
1243 | { | |
aeb136c5 | 1244 | if (rx->sta && rx->sta->cipher_scheme) |
2475b1cc MS |
1245 | return ieee80211_crypto_cs_decrypt(rx); |
1246 | ||
1247 | return RX_DROP_UNUSABLE; | |
1248 | } |