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) |
4325f6ca | 65 | tail += IEEE80211_TKIP_ICV_LEN; |
23c0752a JB |
66 | |
67 | if (WARN_ON(skb_tailroom(skb) < tail || | |
4325f6ca | 68 | skb_headroom(skb) < IEEE80211_TKIP_IV_LEN)) |
23c0752a | 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 | |
87ee475e | 130 | * frames in the BSS. |
816c04fe CL |
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); |
d5184cac HH |
184 | unsigned int hdrlen; |
185 | int len, tail; | |
f0706e82 JB |
186 | u8 *pos; |
187 | ||
813d7669 | 188 | if (info->control.hw_key && |
ee70108f JD |
189 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) && |
190 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) { | |
813d7669 | 191 | /* hwaccel - with no need for software-generated IV */ |
23c0752a | 192 | return 0; |
e039fa4a JB |
193 | } |
194 | ||
d5184cac | 195 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 JB |
196 | len = skb->len - hdrlen; |
197 | ||
813d7669 | 198 | if (info->control.hw_key) |
23c0752a | 199 | tail = 0; |
11a843b7 | 200 | else |
4325f6ca | 201 | tail = IEEE80211_TKIP_ICV_LEN; |
23c0752a JB |
202 | |
203 | if (WARN_ON(skb_tailroom(skb) < tail || | |
4325f6ca | 204 | skb_headroom(skb) < IEEE80211_TKIP_IV_LEN)) |
23c0752a | 205 | return -1; |
f0706e82 | 206 | |
4325f6ca JB |
207 | pos = skb_push(skb, IEEE80211_TKIP_IV_LEN); |
208 | memmove(pos, pos + IEEE80211_TKIP_IV_LEN, hdrlen); | |
209 | skb_set_network_header(skb, skb_network_offset(skb) + | |
210 | IEEE80211_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 */ |
03395003 | 219 | spin_lock(&key->u.tkip.txlock); |
b0f76b33 HH |
220 | key->u.tkip.tx.iv16++; |
221 | if (key->u.tkip.tx.iv16 == 0) | |
222 | key->u.tkip.tx.iv32++; | |
523b02ea | 223 | pos = ieee80211_tkip_add_iv(pos, key); |
03395003 | 224 | spin_unlock(&key->u.tkip.txlock); |
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 */ | |
4325f6ca | 231 | skb_put(skb, IEEE80211_TKIP_ICV_LEN); |
f0706e82 | 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 */ | |
4325f6ca | 294 | skb_trim(skb, skb->len - IEEE80211_TKIP_ICV_LEN); |
f0706e82 JB |
295 | |
296 | /* Remove IV */ | |
4325f6ca JB |
297 | memmove(skb->data + IEEE80211_TKIP_IV_LEN, skb->data, hdrlen); |
298 | skb_pull(skb, IEEE80211_TKIP_IV_LEN); | |
f0706e82 | 299 | |
9ae54c84 | 300 | return RX_CONTINUE; |
f0706e82 JB |
301 | } |
302 | ||
303 | ||
30ef7ef9 | 304 | static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad) |
f0706e82 | 305 | { |
f14df804 | 306 | __le16 mask_fc; |
fb733336 | 307 | int a4_included, mgmt; |
f14df804 | 308 | u8 qos_tid; |
7ec7c4a9 | 309 | u16 len_a; |
f14df804 HH |
310 | unsigned int hdrlen; |
311 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
f0706e82 | 312 | |
f14df804 | 313 | /* |
fb733336 | 314 | * Mask FC: zero subtype b4 b5 b6 (if not mgmt) |
f14df804 HH |
315 | * Retry, PwrMgt, MoreData; set Protected |
316 | */ | |
fb733336 | 317 | mgmt = ieee80211_is_mgmt(hdr->frame_control); |
f14df804 | 318 | mask_fc = hdr->frame_control; |
fb733336 | 319 | mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | |
f14df804 | 320 | IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA); |
fb733336 JM |
321 | if (!mgmt) |
322 | mask_fc &= ~cpu_to_le16(0x0070); | |
f14df804 HH |
323 | mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); |
324 | ||
325 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
326 | len_a = hdrlen - 2; | |
327 | a4_included = ieee80211_has_a4(hdr->frame_control); | |
f0706e82 | 328 | |
f14df804 HH |
329 | if (ieee80211_is_data_qos(hdr->frame_control)) |
330 | qos_tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; | |
331 | else | |
332 | qos_tid = 0; | |
333 | ||
7ec7c4a9 AB |
334 | /* In CCM, the initial vectors (IV) used for CTR mode encryption and CBC |
335 | * mode authentication are not allowed to collide, yet both are derived | |
336 | * from this vector b_0. We only set L := 1 here to indicate that the | |
337 | * data size can be represented in (L+1) bytes. The CCM layer will take | |
338 | * care of storing the data length in the top (L+1) bytes and setting | |
339 | * and clearing the other bits as is required to derive the two IVs. | |
340 | */ | |
341 | b_0[0] = 0x1; | |
f14df804 | 342 | |
fb733336 JM |
343 | /* Nonce: Nonce Flags | A2 | PN |
344 | * Nonce Flags: Priority (b0..b3) | Management (b4) | Reserved (b5..b7) | |
345 | */ | |
346 | b_0[1] = qos_tid | (mgmt << 4); | |
73e1f7c8 | 347 | memcpy(&b_0[2], hdr->addr2, ETH_ALEN); |
4325f6ca | 348 | memcpy(&b_0[8], pn, IEEE80211_CCMP_PN_LEN); |
f0706e82 JB |
349 | |
350 | /* AAD (extra authenticate-only data) / masked 802.11 header | |
351 | * FC | A1 | A2 | A3 | SC | [A4] | [QC] */ | |
f14df804 HH |
352 | put_unaligned_be16(len_a, &aad[0]); |
353 | put_unaligned(mask_fc, (__le16 *)&aad[2]); | |
73e1f7c8 | 354 | memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN); |
f0706e82 JB |
355 | |
356 | /* Mask Seq#, leave Frag# */ | |
357 | aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f; | |
358 | aad[23] = 0; | |
f14df804 | 359 | |
f0706e82 | 360 | if (a4_included) { |
73e1f7c8 | 361 | memcpy(&aad[24], hdr->addr4, ETH_ALEN); |
f14df804 | 362 | aad[30] = qos_tid; |
f0706e82 | 363 | aad[31] = 0; |
f14df804 | 364 | } else { |
73e1f7c8 | 365 | memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN); |
f14df804 | 366 | aad[24] = qos_tid; |
f0706e82 JB |
367 | } |
368 | } | |
369 | ||
370 | ||
371 | static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn, int key_id) | |
372 | { | |
373 | hdr[0] = pn[5]; | |
374 | hdr[1] = pn[4]; | |
375 | hdr[2] = 0; | |
376 | hdr[3] = 0x20 | (key_id << 6); | |
377 | hdr[4] = pn[3]; | |
378 | hdr[5] = pn[2]; | |
379 | hdr[6] = pn[1]; | |
380 | hdr[7] = pn[0]; | |
381 | } | |
382 | ||
383 | ||
c6a1fa12 | 384 | static inline void ccmp_hdr2pn(u8 *pn, u8 *hdr) |
f0706e82 JB |
385 | { |
386 | pn[0] = hdr[7]; | |
387 | pn[1] = hdr[6]; | |
388 | pn[2] = hdr[5]; | |
389 | pn[3] = hdr[4]; | |
390 | pn[4] = hdr[1]; | |
391 | pn[5] = hdr[0]; | |
f0706e82 JB |
392 | } |
393 | ||
394 | ||
e039fa4a | 395 | static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb) |
f0706e82 JB |
396 | { |
397 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
398 | struct ieee80211_key *key = tx->key; | |
e039fa4a | 399 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
23c0752a | 400 | int hdrlen, len, tail; |
aba83a0b JB |
401 | u8 *pos; |
402 | u8 pn[6]; | |
403 | u64 pn64; | |
7ec7c4a9 AB |
404 | u8 aad[2 * AES_BLOCK_SIZE]; |
405 | u8 b_0[AES_BLOCK_SIZE]; | |
f0706e82 | 406 | |
813d7669 | 407 | if (info->control.hw_key && |
077a9154 AN |
408 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) && |
409 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) { | |
813d7669 JB |
410 | /* |
411 | * hwaccel has no need for preallocated room for CCMP | |
412 | * header or MIC fields | |
413 | */ | |
23c0752a | 414 | return 0; |
e039fa4a JB |
415 | } |
416 | ||
d5184cac | 417 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 JB |
418 | len = skb->len - hdrlen; |
419 | ||
813d7669 | 420 | if (info->control.hw_key) |
23c0752a | 421 | tail = 0; |
11a843b7 | 422 | else |
4325f6ca | 423 | tail = IEEE80211_CCMP_MIC_LEN; |
23c0752a JB |
424 | |
425 | if (WARN_ON(skb_tailroom(skb) < tail || | |
4325f6ca | 426 | skb_headroom(skb) < IEEE80211_CCMP_HDR_LEN)) |
23c0752a | 427 | return -1; |
f0706e82 | 428 | |
4325f6ca JB |
429 | pos = skb_push(skb, IEEE80211_CCMP_HDR_LEN); |
430 | memmove(pos, pos + IEEE80211_CCMP_HDR_LEN, hdrlen); | |
431 | skb_set_network_header(skb, skb_network_offset(skb) + | |
432 | IEEE80211_CCMP_HDR_LEN); | |
077a9154 AN |
433 | |
434 | /* the HW only needs room for the IV, but not the actual IV */ | |
e0830f71 AN |
435 | if (info->control.hw_key && |
436 | (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) | |
077a9154 AN |
437 | return 0; |
438 | ||
f0706e82 JB |
439 | hdr = (struct ieee80211_hdr *) pos; |
440 | pos += hdrlen; | |
441 | ||
aba83a0b | 442 | pn64 = atomic64_inc_return(&key->u.ccmp.tx_pn); |
f0706e82 | 443 | |
aba83a0b JB |
444 | pn[5] = pn64; |
445 | pn[4] = pn64 >> 8; | |
446 | pn[3] = pn64 >> 16; | |
447 | pn[2] = pn64 >> 24; | |
448 | pn[1] = pn64 >> 32; | |
449 | pn[0] = pn64 >> 40; | |
f0706e82 | 450 | |
8f20fc24 | 451 | ccmp_pn2hdr(pos, pn, key->conf.keyidx); |
f0706e82 | 452 | |
813d7669 JB |
453 | /* hwaccel - with software CCMP header */ |
454 | if (info->control.hw_key) | |
f0706e82 | 455 | return 0; |
f0706e82 | 456 | |
4325f6ca | 457 | pos += IEEE80211_CCMP_HDR_LEN; |
30ef7ef9 | 458 | ccmp_special_blocks(skb, pn, b_0, aad); |
7ec7c4a9 AB |
459 | ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, b_0, aad, pos, len, |
460 | skb_put(skb, IEEE80211_CCMP_MIC_LEN)); | |
f0706e82 JB |
461 | |
462 | return 0; | |
463 | } | |
464 | ||
465 | ||
9ae54c84 | 466 | ieee80211_tx_result |
5cf121c3 | 467 | ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx) |
f0706e82 | 468 | { |
252b86c4 | 469 | struct sk_buff *skb; |
f0706e82 | 470 | |
5cf121c3 | 471 | ieee80211_tx_set_protected(tx); |
f0706e82 | 472 | |
252b86c4 | 473 | skb_queue_walk(&tx->skbs, skb) { |
2de8e0d9 JB |
474 | if (ccmp_encrypt_skb(tx, skb) < 0) |
475 | return TX_DROP; | |
252b86c4 | 476 | } |
f0706e82 | 477 | |
9ae54c84 | 478 | return TX_CONTINUE; |
f0706e82 JB |
479 | } |
480 | ||
481 | ||
9ae54c84 | 482 | ieee80211_rx_result |
5cf121c3 | 483 | ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx) |
f0706e82 | 484 | { |
c34498b9 | 485 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
f0706e82 JB |
486 | int hdrlen; |
487 | struct ieee80211_key *key = rx->key; | |
488 | struct sk_buff *skb = rx->skb; | |
eb9fb5b8 | 489 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
4325f6ca | 490 | u8 pn[IEEE80211_CCMP_PN_LEN]; |
f0706e82 | 491 | int data_len; |
9190252c | 492 | int queue; |
f0706e82 | 493 | |
d5184cac | 494 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 | 495 | |
fb733336 JM |
496 | if (!ieee80211_is_data(hdr->frame_control) && |
497 | !ieee80211_is_robust_mgmt_frame(hdr)) | |
9ae54c84 | 498 | return RX_CONTINUE; |
f0706e82 | 499 | |
4325f6ca JB |
500 | data_len = skb->len - hdrlen - IEEE80211_CCMP_HDR_LEN - |
501 | IEEE80211_CCMP_MIC_LEN; | |
f0706e82 | 502 | if (!rx->sta || data_len < 0) |
e4c26add | 503 | return RX_DROP_UNUSABLE; |
f0706e82 | 504 | |
a8286911 | 505 | if (status->flag & RX_FLAG_DECRYPTED) { |
4325f6ca | 506 | if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_CCMP_HDR_LEN)) |
a8286911 JB |
507 | return RX_DROP_UNUSABLE; |
508 | } else { | |
509 | if (skb_linearize(rx->skb)) | |
510 | return RX_DROP_UNUSABLE; | |
511 | } | |
512 | ||
c6a1fa12 | 513 | ccmp_hdr2pn(pn, skb->data + hdrlen); |
f0706e82 | 514 | |
9e26297a | 515 | queue = rx->security_idx; |
9190252c | 516 | |
4325f6ca | 517 | if (memcmp(pn, key->u.ccmp.rx_pn[queue], IEEE80211_CCMP_PN_LEN) <= 0) { |
f0706e82 | 518 | key->u.ccmp.replays++; |
e4c26add | 519 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
520 | } |
521 | ||
eb9fb5b8 | 522 | if (!(status->flag & RX_FLAG_DECRYPTED)) { |
7ec7c4a9 AB |
523 | u8 aad[2 * AES_BLOCK_SIZE]; |
524 | u8 b_0[AES_BLOCK_SIZE]; | |
7848ba7d | 525 | /* hardware didn't decrypt/verify MIC */ |
30ef7ef9 | 526 | ccmp_special_blocks(skb, pn, b_0, aad); |
f0706e82 JB |
527 | |
528 | if (ieee80211_aes_ccm_decrypt( | |
7ec7c4a9 | 529 | key->u.ccmp.tfm, b_0, aad, |
4325f6ca JB |
530 | skb->data + hdrlen + IEEE80211_CCMP_HDR_LEN, |
531 | data_len, | |
7ec7c4a9 | 532 | skb->data + skb->len - IEEE80211_CCMP_MIC_LEN)) |
e4c26add | 533 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
534 | } |
535 | ||
4325f6ca | 536 | memcpy(key->u.ccmp.rx_pn[queue], pn, IEEE80211_CCMP_PN_LEN); |
f0706e82 JB |
537 | |
538 | /* Remove CCMP header and MIC */ | |
4325f6ca | 539 | if (pskb_trim(skb, skb->len - IEEE80211_CCMP_MIC_LEN)) |
a8286911 | 540 | return RX_DROP_UNUSABLE; |
4325f6ca JB |
541 | memmove(skb->data + IEEE80211_CCMP_HDR_LEN, skb->data, hdrlen); |
542 | skb_pull(skb, IEEE80211_CCMP_HDR_LEN); | |
f0706e82 | 543 | |
9ae54c84 | 544 | return RX_CONTINUE; |
f0706e82 | 545 | } |
765cb46a | 546 | |
2475b1cc MS |
547 | static ieee80211_tx_result |
548 | ieee80211_crypto_cs_encrypt(struct ieee80211_tx_data *tx, | |
549 | struct sk_buff *skb) | |
550 | { | |
551 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
552 | struct ieee80211_key *key = tx->key; | |
553 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
554 | const struct ieee80211_cipher_scheme *cs = key->sta->cipher_scheme; | |
555 | int hdrlen; | |
556 | u8 *pos; | |
557 | ||
558 | if (info->control.hw_key && | |
559 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) { | |
560 | /* hwaccel has no need for preallocated head room */ | |
561 | return TX_CONTINUE; | |
562 | } | |
563 | ||
564 | if (unlikely(skb_headroom(skb) < cs->hdr_len && | |
565 | pskb_expand_head(skb, cs->hdr_len, 0, GFP_ATOMIC))) | |
566 | return TX_DROP; | |
567 | ||
568 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
569 | ||
570 | pos = skb_push(skb, cs->hdr_len); | |
571 | memmove(pos, pos + cs->hdr_len, hdrlen); | |
572 | skb_set_network_header(skb, skb_network_offset(skb) + cs->hdr_len); | |
573 | ||
574 | return TX_CONTINUE; | |
575 | } | |
576 | ||
577 | static inline int ieee80211_crypto_cs_pn_compare(u8 *pn1, u8 *pn2, int len) | |
578 | { | |
579 | int i; | |
580 | ||
581 | /* pn is little endian */ | |
582 | for (i = len - 1; i >= 0; i--) { | |
583 | if (pn1[i] < pn2[i]) | |
584 | return -1; | |
585 | else if (pn1[i] > pn2[i]) | |
586 | return 1; | |
587 | } | |
588 | ||
589 | return 0; | |
590 | } | |
591 | ||
592 | static ieee80211_rx_result | |
593 | ieee80211_crypto_cs_decrypt(struct ieee80211_rx_data *rx) | |
594 | { | |
595 | struct ieee80211_key *key = rx->key; | |
596 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; | |
597 | const struct ieee80211_cipher_scheme *cs = NULL; | |
598 | int hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
599 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); | |
600 | int data_len; | |
601 | u8 *rx_pn; | |
602 | u8 *skb_pn; | |
603 | u8 qos_tid; | |
604 | ||
605 | if (!rx->sta || !rx->sta->cipher_scheme || | |
606 | !(status->flag & RX_FLAG_DECRYPTED)) | |
607 | return RX_DROP_UNUSABLE; | |
608 | ||
609 | if (!ieee80211_is_data(hdr->frame_control)) | |
610 | return RX_CONTINUE; | |
611 | ||
612 | cs = rx->sta->cipher_scheme; | |
613 | ||
614 | data_len = rx->skb->len - hdrlen - cs->hdr_len; | |
615 | ||
616 | if (data_len < 0) | |
617 | return RX_DROP_UNUSABLE; | |
618 | ||
619 | if (ieee80211_is_data_qos(hdr->frame_control)) | |
620 | qos_tid = *ieee80211_get_qos_ctl(hdr) & | |
621 | IEEE80211_QOS_CTL_TID_MASK; | |
622 | else | |
623 | qos_tid = 0; | |
624 | ||
625 | if (skb_linearize(rx->skb)) | |
626 | return RX_DROP_UNUSABLE; | |
627 | ||
628 | hdr = (struct ieee80211_hdr *)rx->skb->data; | |
629 | ||
630 | rx_pn = key->u.gen.rx_pn[qos_tid]; | |
631 | skb_pn = rx->skb->data + hdrlen + cs->pn_off; | |
632 | ||
633 | if (ieee80211_crypto_cs_pn_compare(skb_pn, rx_pn, cs->pn_len) <= 0) | |
634 | return RX_DROP_UNUSABLE; | |
635 | ||
636 | memcpy(rx_pn, skb_pn, cs->pn_len); | |
637 | ||
638 | /* remove security header and MIC */ | |
639 | if (pskb_trim(rx->skb, rx->skb->len - cs->mic_len)) | |
640 | return RX_DROP_UNUSABLE; | |
641 | ||
642 | memmove(rx->skb->data + cs->hdr_len, rx->skb->data, hdrlen); | |
643 | skb_pull(rx->skb, cs->hdr_len); | |
644 | ||
645 | return RX_CONTINUE; | |
646 | } | |
765cb46a JM |
647 | |
648 | static void bip_aad(struct sk_buff *skb, u8 *aad) | |
649 | { | |
33766368 JM |
650 | __le16 mask_fc; |
651 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
652 | ||
765cb46a JM |
653 | /* BIP AAD: FC(masked) || A1 || A2 || A3 */ |
654 | ||
655 | /* FC type/subtype */ | |
765cb46a | 656 | /* Mask FC Retry, PwrMgt, MoreData flags to zero */ |
33766368 JM |
657 | mask_fc = hdr->frame_control; |
658 | mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | IEEE80211_FCTL_PM | | |
659 | IEEE80211_FCTL_MOREDATA); | |
660 | put_unaligned(mask_fc, (__le16 *) &aad[0]); | |
765cb46a | 661 | /* A1 || A2 || A3 */ |
33766368 | 662 | memcpy(aad + 2, &hdr->addr1, 3 * ETH_ALEN); |
765cb46a JM |
663 | } |
664 | ||
665 | ||
75396ae6 JB |
666 | static inline void bip_ipn_set64(u8 *d, u64 pn) |
667 | { | |
668 | *d++ = pn; | |
669 | *d++ = pn >> 8; | |
670 | *d++ = pn >> 16; | |
671 | *d++ = pn >> 24; | |
672 | *d++ = pn >> 32; | |
673 | *d = pn >> 40; | |
674 | } | |
675 | ||
765cb46a JM |
676 | static inline void bip_ipn_swap(u8 *d, const u8 *s) |
677 | { | |
678 | *d++ = s[5]; | |
679 | *d++ = s[4]; | |
680 | *d++ = s[3]; | |
681 | *d++ = s[2]; | |
682 | *d++ = s[1]; | |
683 | *d = s[0]; | |
684 | } | |
685 | ||
686 | ||
687 | ieee80211_tx_result | |
688 | ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx) | |
689 | { | |
252b86c4 JB |
690 | struct sk_buff *skb; |
691 | struct ieee80211_tx_info *info; | |
765cb46a JM |
692 | struct ieee80211_key *key = tx->key; |
693 | struct ieee80211_mmie *mmie; | |
75396ae6 JB |
694 | u8 aad[20]; |
695 | u64 pn64; | |
765cb46a | 696 | |
252b86c4 JB |
697 | if (WARN_ON(skb_queue_len(&tx->skbs) != 1)) |
698 | return TX_DROP; | |
699 | ||
700 | skb = skb_peek(&tx->skbs); | |
701 | ||
702 | info = IEEE80211_SKB_CB(skb); | |
703 | ||
813d7669 | 704 | if (info->control.hw_key) |
252b86c4 | 705 | return TX_CONTINUE; |
765cb46a JM |
706 | |
707 | if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie))) | |
708 | return TX_DROP; | |
709 | ||
710 | mmie = (struct ieee80211_mmie *) skb_put(skb, sizeof(*mmie)); | |
711 | mmie->element_id = WLAN_EID_MMIE; | |
712 | mmie->length = sizeof(*mmie) - 2; | |
713 | mmie->key_id = cpu_to_le16(key->conf.keyidx); | |
714 | ||
715 | /* PN = PN + 1 */ | |
75396ae6 | 716 | pn64 = atomic64_inc_return(&key->u.aes_cmac.tx_pn); |
765cb46a | 717 | |
75396ae6 | 718 | bip_ipn_set64(mmie->sequence_number, pn64); |
765cb46a JM |
719 | |
720 | bip_aad(skb, aad); | |
721 | ||
722 | /* | |
723 | * MIC = AES-128-CMAC(IGTK, AAD || Management Frame Body || MMIE, 64) | |
724 | */ | |
75396ae6 JB |
725 | ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad, |
726 | skb->data + 24, skb->len - 24, mmie->mic); | |
765cb46a JM |
727 | |
728 | return TX_CONTINUE; | |
729 | } | |
730 | ||
731 | ||
732 | ieee80211_rx_result | |
733 | ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx) | |
734 | { | |
735 | struct sk_buff *skb = rx->skb; | |
eb9fb5b8 | 736 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
765cb46a JM |
737 | struct ieee80211_key *key = rx->key; |
738 | struct ieee80211_mmie *mmie; | |
739 | u8 aad[20], mic[8], ipn[6]; | |
740 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
741 | ||
742 | if (!ieee80211_is_mgmt(hdr->frame_control)) | |
743 | return RX_CONTINUE; | |
744 | ||
a8286911 JB |
745 | /* management frames are already linear */ |
746 | ||
765cb46a JM |
747 | if (skb->len < 24 + sizeof(*mmie)) |
748 | return RX_DROP_UNUSABLE; | |
749 | ||
750 | mmie = (struct ieee80211_mmie *) | |
751 | (skb->data + skb->len - sizeof(*mmie)); | |
752 | if (mmie->element_id != WLAN_EID_MMIE || | |
753 | mmie->length != sizeof(*mmie) - 2) | |
754 | return RX_DROP_UNUSABLE; /* Invalid MMIE */ | |
755 | ||
756 | bip_ipn_swap(ipn, mmie->sequence_number); | |
757 | ||
758 | if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) { | |
759 | key->u.aes_cmac.replays++; | |
760 | return RX_DROP_UNUSABLE; | |
761 | } | |
762 | ||
eb9fb5b8 | 763 | if (!(status->flag & RX_FLAG_DECRYPTED)) { |
765cb46a JM |
764 | /* hardware didn't decrypt/verify MIC */ |
765 | bip_aad(skb, aad); | |
75396ae6 | 766 | ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad, |
765cb46a JM |
767 | skb->data + 24, skb->len - 24, mic); |
768 | if (memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) { | |
769 | key->u.aes_cmac.icverrors++; | |
770 | return RX_DROP_UNUSABLE; | |
771 | } | |
772 | } | |
773 | ||
774 | memcpy(key->u.aes_cmac.rx_pn, ipn, 6); | |
775 | ||
776 | /* Remove MMIE */ | |
777 | skb_trim(skb, skb->len - sizeof(*mmie)); | |
778 | ||
779 | return RX_CONTINUE; | |
780 | } | |
d32a1028 YD |
781 | |
782 | ieee80211_tx_result | |
783 | ieee80211_crypto_hw_encrypt(struct ieee80211_tx_data *tx) | |
784 | { | |
785 | struct sk_buff *skb; | |
786 | struct ieee80211_tx_info *info = NULL; | |
2475b1cc | 787 | ieee80211_tx_result res; |
d32a1028 YD |
788 | |
789 | skb_queue_walk(&tx->skbs, skb) { | |
790 | info = IEEE80211_SKB_CB(skb); | |
791 | ||
792 | /* handle hw-only algorithm */ | |
793 | if (!info->control.hw_key) | |
794 | return TX_DROP; | |
2475b1cc MS |
795 | |
796 | if (tx->key->sta->cipher_scheme) { | |
797 | res = ieee80211_crypto_cs_encrypt(tx, skb); | |
798 | if (res != TX_CONTINUE) | |
799 | return res; | |
800 | } | |
d32a1028 YD |
801 | } |
802 | ||
803 | ieee80211_tx_set_protected(tx); | |
804 | ||
805 | return TX_CONTINUE; | |
806 | } | |
2475b1cc MS |
807 | |
808 | ieee80211_rx_result | |
809 | ieee80211_crypto_hw_decrypt(struct ieee80211_rx_data *rx) | |
810 | { | |
811 | if (rx->sta->cipher_scheme) | |
812 | return ieee80211_crypto_cs_decrypt(rx); | |
813 | ||
814 | return RX_DROP_UNUSABLE; | |
815 | } |