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" |
f0706e82 JB |
25 | #include "wpa.h" |
26 | ||
9ae54c84 | 27 | ieee80211_tx_result |
5cf121c3 | 28 | ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx) |
f0706e82 | 29 | { |
747d753d | 30 | u8 *data, *key, *mic; |
f0706e82 | 31 | size_t data_len; |
8e8862b7 HH |
32 | unsigned int hdrlen; |
33 | struct ieee80211_hdr *hdr; | |
f0706e82 | 34 | struct sk_buff *skb = tx->skb; |
813d7669 | 35 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
23c0752a | 36 | int tail; |
f0706e82 | 37 | |
c34498b9 | 38 | hdr = (struct ieee80211_hdr *)skb->data; |
97359d12 JB |
39 | if (!tx->key || tx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP || |
40 | skb->len < 24 || !ieee80211_is_data_present(hdr->frame_control)) | |
9ae54c84 | 41 | return TX_CONTINUE; |
f0706e82 | 42 | |
8e8862b7 HH |
43 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
44 | if (skb->len < hdrlen) | |
9ae54c84 | 45 | return TX_DROP; |
f0706e82 | 46 | |
8e8862b7 HH |
47 | data = skb->data + hdrlen; |
48 | data_len = skb->len - hdrlen; | |
49 | ||
681d1190 JM |
50 | if (unlikely(info->flags & IEEE80211_TX_INTFL_TKIP_MIC_FAILURE)) { |
51 | /* Need to use software crypto for the test */ | |
52 | info->control.hw_key = NULL; | |
53 | } | |
54 | ||
813d7669 | 55 | if (info->control.hw_key && |
a26eb27a JB |
56 | (info->flags & IEEE80211_TX_CTL_DONTFRAG || |
57 | tx->local->ops->set_frag_threshold) && | |
813d7669 JB |
58 | !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC)) { |
59 | /* hwaccel - with no need for SW-generated MMIC */ | |
9ae54c84 | 60 | return TX_CONTINUE; |
f0706e82 JB |
61 | } |
62 | ||
23c0752a | 63 | tail = MICHAEL_MIC_LEN; |
813d7669 | 64 | if (!info->control.hw_key) |
23c0752a JB |
65 | tail += TKIP_ICV_LEN; |
66 | ||
67 | if (WARN_ON(skb_tailroom(skb) < tail || | |
68 | skb_headroom(skb) < TKIP_IV_LEN)) | |
69 | return TX_DROP; | |
f0706e82 | 70 | |
747d753d | 71 | key = &tx->key->conf.key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY]; |
f0706e82 | 72 | mic = skb_put(skb, MICHAEL_MIC_LEN); |
8e8862b7 | 73 | michael_mic(key, hdr, data, data_len, mic); |
681d1190 JM |
74 | if (unlikely(info->flags & IEEE80211_TX_INTFL_TKIP_MIC_FAILURE)) |
75 | mic[0]++; | |
f0706e82 | 76 | |
9ae54c84 | 77 | return TX_CONTINUE; |
f0706e82 JB |
78 | } |
79 | ||
80 | ||
9ae54c84 | 81 | ieee80211_rx_result |
5cf121c3 | 82 | ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx) |
f0706e82 | 83 | { |
747d753d | 84 | u8 *data, *key = NULL; |
f0706e82 | 85 | size_t data_len; |
8e8862b7 | 86 | unsigned int hdrlen; |
f0706e82 JB |
87 | u8 mic[MICHAEL_MIC_LEN]; |
88 | struct sk_buff *skb = rx->skb; | |
eb9fb5b8 JB |
89 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
90 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
f0706e82 | 91 | |
816c04fe CL |
92 | /* |
93 | * it makes no sense to check for MIC errors on anything other | |
94 | * than data frames. | |
95 | */ | |
96 | if (!ieee80211_is_data_present(hdr->frame_control)) | |
9ae54c84 | 97 | return RX_CONTINUE; |
f0706e82 | 98 | |
816c04fe CL |
99 | /* |
100 | * No way to verify the MIC if the hardware stripped it or | |
101 | * the IV with the key index. In this case we have solely rely | |
102 | * on the driver to set RX_FLAG_MMIC_ERROR in the event of a | |
103 | * MIC failure report. | |
104 | */ | |
105 | if (status->flag & (RX_FLAG_MMIC_STRIPPED | RX_FLAG_IV_STRIPPED)) { | |
106 | if (status->flag & RX_FLAG_MMIC_ERROR) | |
b98ea058 | 107 | goto mic_fail_no_key; |
816c04fe | 108 | |
4045f72b SG |
109 | if (!(status->flag & RX_FLAG_IV_STRIPPED) && rx->key && |
110 | rx->key->conf.cipher == WLAN_CIPHER_SUITE_TKIP) | |
816c04fe CL |
111 | goto update_iv; |
112 | ||
113 | return RX_CONTINUE; | |
114 | } | |
115 | ||
116 | /* | |
117 | * Some hardware seems to generate Michael MIC failure reports; even | |
118 | * though, the frame was not encrypted with TKIP and therefore has no | |
119 | * MIC. Ignore the flag them to avoid triggering countermeasures. | |
120 | */ | |
97359d12 | 121 | if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP || |
816c04fe | 122 | !(status->flag & RX_FLAG_DECRYPTED)) |
9ae54c84 | 123 | return RX_CONTINUE; |
f0706e82 | 124 | |
816c04fe CL |
125 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP && rx->key->conf.keyidx) { |
126 | /* | |
127 | * APs with pairwise keys should never receive Michael MIC | |
128 | * errors for non-zero keyidx because these are reserved for | |
129 | * group keys and only the AP is sending real multicast | |
130 | * frames in the BSS. ( | |
131 | */ | |
132 | return RX_DROP_UNUSABLE; | |
133 | } | |
134 | ||
135 | if (status->flag & RX_FLAG_MMIC_ERROR) | |
136 | goto mic_fail; | |
137 | ||
8e8862b7 HH |
138 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
139 | if (skb->len < hdrlen + MICHAEL_MIC_LEN) | |
e4c26add | 140 | return RX_DROP_UNUSABLE; |
f0706e82 | 141 | |
a8286911 JB |
142 | if (skb_linearize(rx->skb)) |
143 | return RX_DROP_UNUSABLE; | |
144 | hdr = (void *)skb->data; | |
145 | ||
8e8862b7 HH |
146 | data = skb->data + hdrlen; |
147 | data_len = skb->len - hdrlen - MICHAEL_MIC_LEN; | |
747d753d | 148 | key = &rx->key->conf.key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY]; |
8e8862b7 | 149 | michael_mic(key, hdr, data, data_len, mic); |
816c04fe CL |
150 | if (memcmp(mic, data + data_len, MICHAEL_MIC_LEN) != 0) |
151 | goto mic_fail; | |
f0706e82 | 152 | |
f0706e82 JB |
153 | /* remove Michael MIC from payload */ |
154 | skb_trim(skb, skb->len - MICHAEL_MIC_LEN); | |
155 | ||
816c04fe | 156 | update_iv: |
50741ae0 | 157 | /* update IV in key information to be able to detect replays */ |
9e26297a JB |
158 | rx->key->u.tkip.rx[rx->security_idx].iv32 = rx->tkip_iv32; |
159 | rx->key->u.tkip.rx[rx->security_idx].iv16 = rx->tkip_iv16; | |
50741ae0 | 160 | |
9ae54c84 | 161 | return RX_CONTINUE; |
816c04fe CL |
162 | |
163 | mic_fail: | |
b98ea058 S |
164 | rx->key->u.tkip.mic_failures++; |
165 | ||
166 | mic_fail_no_key: | |
a66b98db AN |
167 | /* |
168 | * In some cases the key can be unset - e.g. a multicast packet, in | |
169 | * a driver that supports HW encryption. Send up the key idx only if | |
170 | * the key is set. | |
171 | */ | |
172 | mac80211_ev_michael_mic_failure(rx->sdata, | |
173 | rx->key ? rx->key->conf.keyidx : -1, | |
816c04fe CL |
174 | (void *) skb->data, NULL, GFP_ATOMIC); |
175 | return RX_DROP_UNUSABLE; | |
f0706e82 JB |
176 | } |
177 | ||
178 | ||
e039fa4a | 179 | static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb) |
f0706e82 JB |
180 | { |
181 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
182 | struct ieee80211_key *key = tx->key; | |
e039fa4a | 183 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
523b02ea | 184 | unsigned long flags; |
d5184cac HH |
185 | unsigned int hdrlen; |
186 | int len, tail; | |
f0706e82 JB |
187 | u8 *pos; |
188 | ||
813d7669 | 189 | if (info->control.hw_key && |
ee70108f JD |
190 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) && |
191 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) { | |
813d7669 | 192 | /* hwaccel - with no need for software-generated IV */ |
23c0752a | 193 | return 0; |
e039fa4a JB |
194 | } |
195 | ||
d5184cac | 196 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 JB |
197 | len = skb->len - hdrlen; |
198 | ||
813d7669 | 199 | if (info->control.hw_key) |
23c0752a | 200 | tail = 0; |
11a843b7 | 201 | else |
23c0752a JB |
202 | tail = TKIP_ICV_LEN; |
203 | ||
204 | if (WARN_ON(skb_tailroom(skb) < tail || | |
205 | skb_headroom(skb) < TKIP_IV_LEN)) | |
206 | return -1; | |
f0706e82 JB |
207 | |
208 | pos = skb_push(skb, TKIP_IV_LEN); | |
209 | memmove(pos, pos + TKIP_IV_LEN, hdrlen); | |
7863157d | 210 | skb_set_network_header(skb, skb_network_offset(skb) + TKIP_IV_LEN); |
f0706e82 JB |
211 | pos += hdrlen; |
212 | ||
ee70108f JD |
213 | /* the HW only needs room for the IV, but not the actual IV */ |
214 | if (info->control.hw_key && | |
215 | (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) | |
216 | return 0; | |
217 | ||
f0706e82 | 218 | /* Increase IV for the frame */ |
523b02ea | 219 | spin_lock_irqsave(&key->u.tkip.txlock, flags); |
b0f76b33 HH |
220 | key->u.tkip.tx.iv16++; |
221 | if (key->u.tkip.tx.iv16 == 0) | |
222 | key->u.tkip.tx.iv32++; | |
523b02ea JB |
223 | pos = ieee80211_tkip_add_iv(pos, key); |
224 | spin_unlock_irqrestore(&key->u.tkip.txlock, flags); | |
f0706e82 | 225 | |
813d7669 JB |
226 | /* hwaccel - with software IV */ |
227 | if (info->control.hw_key) | |
f0706e82 | 228 | return 0; |
f0706e82 JB |
229 | |
230 | /* Add room for ICV */ | |
231 | skb_put(skb, TKIP_ICV_LEN); | |
232 | ||
3473187d | 233 | return ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm, |
523b02ea | 234 | key, skb, pos, len); |
f0706e82 JB |
235 | } |
236 | ||
237 | ||
9ae54c84 | 238 | ieee80211_tx_result |
5cf121c3 | 239 | ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx) |
f0706e82 | 240 | { |
252b86c4 | 241 | struct sk_buff *skb; |
f0706e82 | 242 | |
5cf121c3 | 243 | ieee80211_tx_set_protected(tx); |
f0706e82 | 244 | |
252b86c4 | 245 | skb_queue_walk(&tx->skbs, skb) { |
2de8e0d9 JB |
246 | if (tkip_encrypt_skb(tx, skb) < 0) |
247 | return TX_DROP; | |
252b86c4 | 248 | } |
f0706e82 | 249 | |
9ae54c84 | 250 | return TX_CONTINUE; |
f0706e82 JB |
251 | } |
252 | ||
253 | ||
9ae54c84 | 254 | ieee80211_rx_result |
5cf121c3 | 255 | ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx) |
f0706e82 JB |
256 | { |
257 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; | |
747d753d | 258 | int hdrlen, res, hwaccel = 0; |
f0706e82 JB |
259 | struct ieee80211_key *key = rx->key; |
260 | struct sk_buff *skb = rx->skb; | |
eb9fb5b8 | 261 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
f0706e82 | 262 | |
d5184cac | 263 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 | 264 | |
c34498b9 | 265 | if (!ieee80211_is_data(hdr->frame_control)) |
9ae54c84 | 266 | return RX_CONTINUE; |
f0706e82 JB |
267 | |
268 | if (!rx->sta || skb->len - hdrlen < 12) | |
e4c26add | 269 | return RX_DROP_UNUSABLE; |
f0706e82 | 270 | |
a8286911 JB |
271 | /* it may be possible to optimize this a bit more */ |
272 | if (skb_linearize(rx->skb)) | |
273 | return RX_DROP_UNUSABLE; | |
274 | hdr = (void *)skb->data; | |
275 | ||
dc1580dd JB |
276 | /* |
277 | * Let TKIP code verify IV, but skip decryption. | |
278 | * In the case where hardware checks the IV as well, | |
279 | * we don't even get here, see ieee80211_rx_h_decrypt() | |
280 | */ | |
281 | if (status->flag & RX_FLAG_DECRYPTED) | |
f0706e82 | 282 | hwaccel = 1; |
f0706e82 JB |
283 | |
284 | res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm, | |
285 | key, skb->data + hdrlen, | |
17741cdc | 286 | skb->len - hdrlen, rx->sta->sta.addr, |
9e26297a | 287 | hdr->addr1, hwaccel, rx->security_idx, |
5cf121c3 JB |
288 | &rx->tkip_iv32, |
289 | &rx->tkip_iv16); | |
747d753d | 290 | if (res != TKIP_DECRYPT_OK) |
e4c26add | 291 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
292 | |
293 | /* Trim ICV */ | |
294 | skb_trim(skb, skb->len - TKIP_ICV_LEN); | |
295 | ||
296 | /* Remove IV */ | |
297 | memmove(skb->data + TKIP_IV_LEN, skb->data, hdrlen); | |
298 | skb_pull(skb, TKIP_IV_LEN); | |
299 | ||
9ae54c84 | 300 | return RX_CONTINUE; |
f0706e82 JB |
301 | } |
302 | ||
303 | ||
feccb466 | 304 | static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *scratch, |
f0706e82 JB |
305 | int encrypted) |
306 | { | |
f14df804 | 307 | __le16 mask_fc; |
fb733336 | 308 | int a4_included, mgmt; |
f14df804 | 309 | u8 qos_tid; |
feccb466 | 310 | u8 *b_0, *aad; |
f14df804 HH |
311 | u16 data_len, len_a; |
312 | unsigned int hdrlen; | |
313 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
f0706e82 | 314 | |
0cd20a27 | 315 | memset(scratch, 0, 6 * AES_BLOCK_SIZE); |
aba83a0b | 316 | |
0cd20a27 JB |
317 | b_0 = scratch + 3 * AES_BLOCK_SIZE; |
318 | aad = scratch + 4 * AES_BLOCK_SIZE; | |
feccb466 | 319 | |
f14df804 | 320 | /* |
fb733336 | 321 | * Mask FC: zero subtype b4 b5 b6 (if not mgmt) |
f14df804 HH |
322 | * Retry, PwrMgt, MoreData; set Protected |
323 | */ | |
fb733336 | 324 | mgmt = ieee80211_is_mgmt(hdr->frame_control); |
f14df804 | 325 | mask_fc = hdr->frame_control; |
fb733336 | 326 | mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | |
f14df804 | 327 | IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA); |
fb733336 JM |
328 | if (!mgmt) |
329 | mask_fc &= ~cpu_to_le16(0x0070); | |
f14df804 HH |
330 | mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); |
331 | ||
332 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
333 | len_a = hdrlen - 2; | |
334 | a4_included = ieee80211_has_a4(hdr->frame_control); | |
f0706e82 | 335 | |
f14df804 HH |
336 | if (ieee80211_is_data_qos(hdr->frame_control)) |
337 | qos_tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; | |
338 | else | |
339 | qos_tid = 0; | |
340 | ||
341 | data_len = skb->len - hdrlen - CCMP_HDR_LEN; | |
342 | if (encrypted) | |
343 | data_len -= CCMP_MIC_LEN; | |
344 | ||
345 | /* First block, b_0 */ | |
f0706e82 | 346 | b_0[0] = 0x59; /* flags: Adata: 1, M: 011, L: 001 */ |
fb733336 JM |
347 | /* Nonce: Nonce Flags | A2 | PN |
348 | * Nonce Flags: Priority (b0..b3) | Management (b4) | Reserved (b5..b7) | |
349 | */ | |
350 | b_0[1] = qos_tid | (mgmt << 4); | |
73e1f7c8 | 351 | memcpy(&b_0[2], hdr->addr2, ETH_ALEN); |
f0706e82 JB |
352 | memcpy(&b_0[8], pn, CCMP_PN_LEN); |
353 | /* l(m) */ | |
f14df804 | 354 | put_unaligned_be16(data_len, &b_0[14]); |
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 | ||
e039fa4a | 401 | static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb) |
f0706e82 JB |
402 | { |
403 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
404 | struct ieee80211_key *key = tx->key; | |
e039fa4a | 405 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
23c0752a | 406 | int hdrlen, len, tail; |
aba83a0b JB |
407 | u8 *pos; |
408 | u8 pn[6]; | |
409 | u64 pn64; | |
0cd20a27 | 410 | u8 scratch[6 * AES_BLOCK_SIZE]; |
f0706e82 | 411 | |
813d7669 | 412 | if (info->control.hw_key && |
077a9154 AN |
413 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) && |
414 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) { | |
813d7669 JB |
415 | /* |
416 | * hwaccel has no need for preallocated room for CCMP | |
417 | * header or MIC fields | |
418 | */ | |
23c0752a | 419 | return 0; |
e039fa4a JB |
420 | } |
421 | ||
d5184cac | 422 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 JB |
423 | len = skb->len - hdrlen; |
424 | ||
813d7669 | 425 | if (info->control.hw_key) |
23c0752a | 426 | tail = 0; |
11a843b7 | 427 | else |
23c0752a JB |
428 | tail = CCMP_MIC_LEN; |
429 | ||
430 | if (WARN_ON(skb_tailroom(skb) < tail || | |
431 | skb_headroom(skb) < CCMP_HDR_LEN)) | |
432 | return -1; | |
f0706e82 JB |
433 | |
434 | pos = skb_push(skb, CCMP_HDR_LEN); | |
435 | memmove(pos, pos + CCMP_HDR_LEN, hdrlen); | |
7863157d | 436 | skb_set_network_header(skb, skb_network_offset(skb) + CCMP_HDR_LEN); |
077a9154 AN |
437 | |
438 | /* the HW only needs room for the IV, but not the actual IV */ | |
e0830f71 AN |
439 | if (info->control.hw_key && |
440 | (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) | |
077a9154 AN |
441 | return 0; |
442 | ||
f0706e82 JB |
443 | hdr = (struct ieee80211_hdr *) pos; |
444 | pos += hdrlen; | |
445 | ||
aba83a0b | 446 | pn64 = atomic64_inc_return(&key->u.ccmp.tx_pn); |
f0706e82 | 447 | |
aba83a0b JB |
448 | pn[5] = pn64; |
449 | pn[4] = pn64 >> 8; | |
450 | pn[3] = pn64 >> 16; | |
451 | pn[2] = pn64 >> 24; | |
452 | pn[1] = pn64 >> 32; | |
453 | pn[0] = pn64 >> 40; | |
f0706e82 | 454 | |
8f20fc24 | 455 | ccmp_pn2hdr(pos, pn, key->conf.keyidx); |
f0706e82 | 456 | |
813d7669 JB |
457 | /* hwaccel - with software CCMP header */ |
458 | if (info->control.hw_key) | |
f0706e82 | 459 | return 0; |
f0706e82 JB |
460 | |
461 | pos += CCMP_HDR_LEN; | |
aba83a0b JB |
462 | ccmp_special_blocks(skb, pn, scratch, 0); |
463 | ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, scratch, pos, len, | |
f0706e82 JB |
464 | pos, skb_put(skb, CCMP_MIC_LEN)); |
465 | ||
466 | return 0; | |
467 | } | |
468 | ||
469 | ||
9ae54c84 | 470 | ieee80211_tx_result |
5cf121c3 | 471 | ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx) |
f0706e82 | 472 | { |
252b86c4 | 473 | struct sk_buff *skb; |
f0706e82 | 474 | |
5cf121c3 | 475 | ieee80211_tx_set_protected(tx); |
f0706e82 | 476 | |
252b86c4 | 477 | skb_queue_walk(&tx->skbs, skb) { |
2de8e0d9 JB |
478 | if (ccmp_encrypt_skb(tx, skb) < 0) |
479 | return TX_DROP; | |
252b86c4 | 480 | } |
f0706e82 | 481 | |
9ae54c84 | 482 | return TX_CONTINUE; |
f0706e82 JB |
483 | } |
484 | ||
485 | ||
9ae54c84 | 486 | ieee80211_rx_result |
5cf121c3 | 487 | ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx) |
f0706e82 | 488 | { |
c34498b9 | 489 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
f0706e82 JB |
490 | int hdrlen; |
491 | struct ieee80211_key *key = rx->key; | |
492 | struct sk_buff *skb = rx->skb; | |
eb9fb5b8 | 493 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
f0706e82 JB |
494 | u8 pn[CCMP_PN_LEN]; |
495 | int data_len; | |
9190252c | 496 | int queue; |
f0706e82 | 497 | |
d5184cac | 498 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 | 499 | |
fb733336 JM |
500 | if (!ieee80211_is_data(hdr->frame_control) && |
501 | !ieee80211_is_robust_mgmt_frame(hdr)) | |
9ae54c84 | 502 | return RX_CONTINUE; |
f0706e82 JB |
503 | |
504 | data_len = skb->len - hdrlen - CCMP_HDR_LEN - CCMP_MIC_LEN; | |
505 | if (!rx->sta || data_len < 0) | |
e4c26add | 506 | return RX_DROP_UNUSABLE; |
f0706e82 | 507 | |
a8286911 JB |
508 | if (status->flag & RX_FLAG_DECRYPTED) { |
509 | if (!pskb_may_pull(rx->skb, hdrlen + CCMP_HDR_LEN)) | |
510 | return RX_DROP_UNUSABLE; | |
511 | } else { | |
512 | if (skb_linearize(rx->skb)) | |
513 | return RX_DROP_UNUSABLE; | |
514 | } | |
515 | ||
c6a1fa12 | 516 | ccmp_hdr2pn(pn, skb->data + hdrlen); |
f0706e82 | 517 | |
9e26297a | 518 | queue = rx->security_idx; |
9190252c JM |
519 | |
520 | if (memcmp(pn, key->u.ccmp.rx_pn[queue], CCMP_PN_LEN) <= 0) { | |
f0706e82 | 521 | key->u.ccmp.replays++; |
e4c26add | 522 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
523 | } |
524 | ||
eb9fb5b8 | 525 | if (!(status->flag & RX_FLAG_DECRYPTED)) { |
0cd20a27 | 526 | u8 scratch[6 * AES_BLOCK_SIZE]; |
7848ba7d | 527 | /* hardware didn't decrypt/verify MIC */ |
aba83a0b | 528 | ccmp_special_blocks(skb, pn, scratch, 1); |
f0706e82 JB |
529 | |
530 | if (ieee80211_aes_ccm_decrypt( | |
aba83a0b | 531 | key->u.ccmp.tfm, scratch, |
f0706e82 JB |
532 | skb->data + hdrlen + CCMP_HDR_LEN, data_len, |
533 | skb->data + skb->len - CCMP_MIC_LEN, | |
c6a1fa12 | 534 | skb->data + hdrlen + CCMP_HDR_LEN)) |
e4c26add | 535 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
536 | } |
537 | ||
9190252c | 538 | memcpy(key->u.ccmp.rx_pn[queue], pn, CCMP_PN_LEN); |
f0706e82 JB |
539 | |
540 | /* Remove CCMP header and MIC */ | |
a8286911 JB |
541 | if (pskb_trim(skb, skb->len - CCMP_MIC_LEN)) |
542 | return RX_DROP_UNUSABLE; | |
f0706e82 JB |
543 | memmove(skb->data + CCMP_HDR_LEN, skb->data, hdrlen); |
544 | skb_pull(skb, CCMP_HDR_LEN); | |
545 | ||
9ae54c84 | 546 | return RX_CONTINUE; |
f0706e82 | 547 | } |
765cb46a JM |
548 | |
549 | ||
550 | static void bip_aad(struct sk_buff *skb, u8 *aad) | |
551 | { | |
33766368 JM |
552 | __le16 mask_fc; |
553 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
554 | ||
765cb46a JM |
555 | /* BIP AAD: FC(masked) || A1 || A2 || A3 */ |
556 | ||
557 | /* FC type/subtype */ | |
765cb46a | 558 | /* Mask FC Retry, PwrMgt, MoreData flags to zero */ |
33766368 JM |
559 | mask_fc = hdr->frame_control; |
560 | mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | IEEE80211_FCTL_PM | | |
561 | IEEE80211_FCTL_MOREDATA); | |
562 | put_unaligned(mask_fc, (__le16 *) &aad[0]); | |
765cb46a | 563 | /* A1 || A2 || A3 */ |
33766368 | 564 | memcpy(aad + 2, &hdr->addr1, 3 * ETH_ALEN); |
765cb46a JM |
565 | } |
566 | ||
567 | ||
75396ae6 JB |
568 | static inline void bip_ipn_set64(u8 *d, u64 pn) |
569 | { | |
570 | *d++ = pn; | |
571 | *d++ = pn >> 8; | |
572 | *d++ = pn >> 16; | |
573 | *d++ = pn >> 24; | |
574 | *d++ = pn >> 32; | |
575 | *d = pn >> 40; | |
576 | } | |
577 | ||
765cb46a JM |
578 | static inline void bip_ipn_swap(u8 *d, const u8 *s) |
579 | { | |
580 | *d++ = s[5]; | |
581 | *d++ = s[4]; | |
582 | *d++ = s[3]; | |
583 | *d++ = s[2]; | |
584 | *d++ = s[1]; | |
585 | *d = s[0]; | |
586 | } | |
587 | ||
588 | ||
589 | ieee80211_tx_result | |
590 | ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx) | |
591 | { | |
252b86c4 JB |
592 | struct sk_buff *skb; |
593 | struct ieee80211_tx_info *info; | |
765cb46a JM |
594 | struct ieee80211_key *key = tx->key; |
595 | struct ieee80211_mmie *mmie; | |
75396ae6 JB |
596 | u8 aad[20]; |
597 | u64 pn64; | |
765cb46a | 598 | |
252b86c4 JB |
599 | if (WARN_ON(skb_queue_len(&tx->skbs) != 1)) |
600 | return TX_DROP; | |
601 | ||
602 | skb = skb_peek(&tx->skbs); | |
603 | ||
604 | info = IEEE80211_SKB_CB(skb); | |
605 | ||
813d7669 | 606 | if (info->control.hw_key) |
252b86c4 | 607 | return TX_CONTINUE; |
765cb46a JM |
608 | |
609 | if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie))) | |
610 | return TX_DROP; | |
611 | ||
612 | mmie = (struct ieee80211_mmie *) skb_put(skb, sizeof(*mmie)); | |
613 | mmie->element_id = WLAN_EID_MMIE; | |
614 | mmie->length = sizeof(*mmie) - 2; | |
615 | mmie->key_id = cpu_to_le16(key->conf.keyidx); | |
616 | ||
617 | /* PN = PN + 1 */ | |
75396ae6 | 618 | pn64 = atomic64_inc_return(&key->u.aes_cmac.tx_pn); |
765cb46a | 619 | |
75396ae6 | 620 | bip_ipn_set64(mmie->sequence_number, pn64); |
765cb46a JM |
621 | |
622 | bip_aad(skb, aad); | |
623 | ||
624 | /* | |
625 | * MIC = AES-128-CMAC(IGTK, AAD || Management Frame Body || MMIE, 64) | |
626 | */ | |
75396ae6 JB |
627 | ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad, |
628 | skb->data + 24, skb->len - 24, mmie->mic); | |
765cb46a JM |
629 | |
630 | return TX_CONTINUE; | |
631 | } | |
632 | ||
633 | ||
634 | ieee80211_rx_result | |
635 | ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx) | |
636 | { | |
637 | struct sk_buff *skb = rx->skb; | |
eb9fb5b8 | 638 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
765cb46a JM |
639 | struct ieee80211_key *key = rx->key; |
640 | struct ieee80211_mmie *mmie; | |
641 | u8 aad[20], mic[8], ipn[6]; | |
642 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
643 | ||
644 | if (!ieee80211_is_mgmt(hdr->frame_control)) | |
645 | return RX_CONTINUE; | |
646 | ||
a8286911 JB |
647 | /* management frames are already linear */ |
648 | ||
765cb46a JM |
649 | if (skb->len < 24 + sizeof(*mmie)) |
650 | return RX_DROP_UNUSABLE; | |
651 | ||
652 | mmie = (struct ieee80211_mmie *) | |
653 | (skb->data + skb->len - sizeof(*mmie)); | |
654 | if (mmie->element_id != WLAN_EID_MMIE || | |
655 | mmie->length != sizeof(*mmie) - 2) | |
656 | return RX_DROP_UNUSABLE; /* Invalid MMIE */ | |
657 | ||
658 | bip_ipn_swap(ipn, mmie->sequence_number); | |
659 | ||
660 | if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) { | |
661 | key->u.aes_cmac.replays++; | |
662 | return RX_DROP_UNUSABLE; | |
663 | } | |
664 | ||
eb9fb5b8 | 665 | if (!(status->flag & RX_FLAG_DECRYPTED)) { |
765cb46a JM |
666 | /* hardware didn't decrypt/verify MIC */ |
667 | bip_aad(skb, aad); | |
75396ae6 | 668 | ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad, |
765cb46a JM |
669 | skb->data + 24, skb->len - 24, mic); |
670 | if (memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) { | |
671 | key->u.aes_cmac.icverrors++; | |
672 | return RX_DROP_UNUSABLE; | |
673 | } | |
674 | } | |
675 | ||
676 | memcpy(key->u.aes_cmac.rx_pn, ipn, 6); | |
677 | ||
678 | /* Remove MMIE */ | |
679 | skb_trim(skb, skb->len - sizeof(*mmie)); | |
680 | ||
681 | return RX_CONTINUE; | |
682 | } | |
d32a1028 YD |
683 | |
684 | ieee80211_tx_result | |
685 | ieee80211_crypto_hw_encrypt(struct ieee80211_tx_data *tx) | |
686 | { | |
687 | struct sk_buff *skb; | |
688 | struct ieee80211_tx_info *info = NULL; | |
689 | ||
690 | skb_queue_walk(&tx->skbs, skb) { | |
691 | info = IEEE80211_SKB_CB(skb); | |
692 | ||
693 | /* handle hw-only algorithm */ | |
694 | if (!info->control.hw_key) | |
695 | return TX_DROP; | |
696 | } | |
697 | ||
698 | ieee80211_tx_set_protected(tx); | |
699 | ||
700 | return TX_CONTINUE; | |
701 | } |