Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Copyright (C)2002 USAGI/WIDE Project | |
1ab1457c | 3 | * |
1da177e4 LT |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
1ab1457c | 8 | * |
1da177e4 LT |
9 | * This program is distributed in the hope that it will be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
1ab1457c | 13 | * |
1da177e4 | 14 | * You should have received a copy of the GNU General Public License |
a99421d9 | 15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
1da177e4 LT |
16 | * |
17 | * Authors | |
18 | * | |
1ab1457c | 19 | * Mitsuru KANDA @USAGI : IPv6 Support |
67ba4152 IM |
20 | * Kazunori MIYAZAWA @USAGI : |
21 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> | |
1ab1457c | 22 | * |
67ba4152 | 23 | * This file is derived from net/ipv4/esp.c |
1da177e4 LT |
24 | */ |
25 | ||
f3213831 JP |
26 | #define pr_fmt(fmt) "IPv6: " fmt |
27 | ||
38320c70 HX |
28 | #include <crypto/aead.h> |
29 | #include <crypto/authenc.h> | |
6b7326c8 | 30 | #include <linux/err.h> |
1da177e4 LT |
31 | #include <linux/module.h> |
32 | #include <net/ip.h> | |
33 | #include <net/xfrm.h> | |
34 | #include <net/esp.h> | |
72998d8c | 35 | #include <linux/scatterlist.h> |
a02a6422 | 36 | #include <linux/kernel.h> |
1da177e4 LT |
37 | #include <linux/pfkeyv2.h> |
38 | #include <linux/random.h> | |
38320c70 | 39 | #include <linux/slab.h> |
b7c6538c | 40 | #include <linux/spinlock.h> |
81aded24 | 41 | #include <net/ip6_route.h> |
1da177e4 LT |
42 | #include <net/icmp.h> |
43 | #include <net/ipv6.h> | |
14c85021 | 44 | #include <net/protocol.h> |
1da177e4 LT |
45 | #include <linux/icmpv6.h> |
46 | ||
38320c70 HX |
47 | struct esp_skb_cb { |
48 | struct xfrm_skb_cb xfrm; | |
49 | void *tmp; | |
50 | }; | |
51 | ||
52 | #define ESP_SKB_CB(__skb) ((struct esp_skb_cb *)&((__skb)->cb[0])) | |
53 | ||
040253c9 MW |
54 | static u32 esp6_get_mtu(struct xfrm_state *x, int mtu); |
55 | ||
38320c70 HX |
56 | /* |
57 | * Allocate an AEAD request structure with extra space for SG and IV. | |
58 | * | |
d212a4c2 SK |
59 | * For alignment considerations the upper 32 bits of the sequence number are |
60 | * placed at the front, if present. Followed by the IV, the request and finally | |
61 | * the SG list. | |
38320c70 HX |
62 | * |
63 | * TODO: Use spare space in skb for this where possible. | |
64 | */ | |
d212a4c2 | 65 | static void *esp_alloc_tmp(struct crypto_aead *aead, int nfrags, int seqihlen) |
38320c70 HX |
66 | { |
67 | unsigned int len; | |
68 | ||
d212a4c2 SK |
69 | len = seqihlen; |
70 | ||
71 | len += crypto_aead_ivsize(aead); | |
72 | ||
38320c70 HX |
73 | if (len) { |
74 | len += crypto_aead_alignmask(aead) & | |
75 | ~(crypto_tfm_ctx_alignment() - 1); | |
76 | len = ALIGN(len, crypto_tfm_ctx_alignment()); | |
77 | } | |
78 | ||
000ae7b2 | 79 | len += sizeof(struct aead_request) + crypto_aead_reqsize(aead); |
38320c70 HX |
80 | len = ALIGN(len, __alignof__(struct scatterlist)); |
81 | ||
82 | len += sizeof(struct scatterlist) * nfrags; | |
83 | ||
84 | return kmalloc(len, GFP_ATOMIC); | |
85 | } | |
86 | ||
d212a4c2 SK |
87 | static inline __be32 *esp_tmp_seqhi(void *tmp) |
88 | { | |
89 | return PTR_ALIGN((__be32 *)tmp, __alignof__(__be32)); | |
90 | } | |
91 | ||
92 | static inline u8 *esp_tmp_iv(struct crypto_aead *aead, void *tmp, int seqhilen) | |
38320c70 HX |
93 | { |
94 | return crypto_aead_ivsize(aead) ? | |
d212a4c2 SK |
95 | PTR_ALIGN((u8 *)tmp + seqhilen, |
96 | crypto_aead_alignmask(aead) + 1) : tmp + seqhilen; | |
38320c70 HX |
97 | } |
98 | ||
38320c70 HX |
99 | static inline struct aead_request *esp_tmp_req(struct crypto_aead *aead, u8 *iv) |
100 | { | |
101 | struct aead_request *req; | |
102 | ||
103 | req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead), | |
104 | crypto_tfm_ctx_alignment()); | |
105 | aead_request_set_tfm(req, aead); | |
106 | return req; | |
107 | } | |
108 | ||
109 | static inline struct scatterlist *esp_req_sg(struct crypto_aead *aead, | |
110 | struct aead_request *req) | |
111 | { | |
112 | return (void *)ALIGN((unsigned long)(req + 1) + | |
113 | crypto_aead_reqsize(aead), | |
114 | __alignof__(struct scatterlist)); | |
115 | } | |
116 | ||
38320c70 HX |
117 | static void esp_output_done(struct crypto_async_request *base, int err) |
118 | { | |
119 | struct sk_buff *skb = base->data; | |
120 | ||
121 | kfree(ESP_SKB_CB(skb)->tmp); | |
122 | xfrm_output_resume(skb, err); | |
123 | } | |
124 | ||
000ae7b2 HX |
125 | /* Move ESP header back into place. */ |
126 | static void esp_restore_header(struct sk_buff *skb, unsigned int offset) | |
127 | { | |
128 | struct ip_esp_hdr *esph = (void *)(skb->data + offset); | |
129 | void *tmp = ESP_SKB_CB(skb)->tmp; | |
130 | __be32 *seqhi = esp_tmp_seqhi(tmp); | |
131 | ||
132 | esph->seq_no = esph->spi; | |
133 | esph->spi = *seqhi; | |
134 | } | |
135 | ||
136 | static void esp_output_restore_header(struct sk_buff *skb) | |
137 | { | |
138 | esp_restore_header(skb, skb_transport_offset(skb) - sizeof(__be32)); | |
139 | } | |
140 | ||
141 | static void esp_output_done_esn(struct crypto_async_request *base, int err) | |
142 | { | |
143 | struct sk_buff *skb = base->data; | |
144 | ||
145 | esp_output_restore_header(skb); | |
146 | esp_output_done(base, err); | |
147 | } | |
148 | ||
1da177e4 LT |
149 | static int esp6_output(struct xfrm_state *x, struct sk_buff *skb) |
150 | { | |
151 | int err; | |
87bdc48d | 152 | struct ip_esp_hdr *esph; |
38320c70 | 153 | struct crypto_aead *aead; |
000ae7b2 | 154 | struct aead_request *req; |
38320c70 | 155 | struct scatterlist *sg; |
1da177e4 | 156 | struct sk_buff *trailer; |
38320c70 | 157 | void *tmp; |
1da177e4 LT |
158 | int blksize; |
159 | int clen; | |
160 | int alen; | |
040253c9 | 161 | int plen; |
000ae7b2 | 162 | int ivlen; |
040253c9 | 163 | int tfclen; |
1da177e4 | 164 | int nfrags; |
d212a4c2 | 165 | int assoclen; |
d212a4c2 | 166 | int seqhilen; |
38320c70 | 167 | u8 *iv; |
27a884dc | 168 | u8 *tail; |
d212a4c2 | 169 | __be32 *seqhi; |
000ae7b2 | 170 | __be64 seqno; |
1da177e4 | 171 | |
7b277b1a | 172 | /* skb is pure payload to encrypt */ |
1c5ad13f | 173 | aead = x->data; |
38320c70 | 174 | alen = crypto_aead_authsize(aead); |
000ae7b2 | 175 | ivlen = crypto_aead_ivsize(aead); |
38320c70 | 176 | |
040253c9 MW |
177 | tfclen = 0; |
178 | if (x->tfcpad) { | |
179 | struct xfrm_dst *dst = (struct xfrm_dst *)skb_dst(skb); | |
180 | u32 padto; | |
181 | ||
182 | padto = min(x->tfcpad, esp6_get_mtu(x, dst->child_mtu_cached)); | |
183 | if (skb->len < padto) | |
184 | tfclen = padto - skb->len; | |
185 | } | |
38320c70 | 186 | blksize = ALIGN(crypto_aead_blocksize(aead), 4); |
040253c9 | 187 | clen = ALIGN(skb->len + 2 + tfclen, blksize); |
040253c9 | 188 | plen = clen - skb->len - tfclen; |
1da177e4 | 189 | |
040253c9 MW |
190 | err = skb_cow_data(skb, tfclen + plen + alen, &trailer); |
191 | if (err < 0) | |
1da177e4 | 192 | goto error; |
38320c70 HX |
193 | nfrags = err; |
194 | ||
d212a4c2 | 195 | assoclen = sizeof(*esph); |
d212a4c2 SK |
196 | seqhilen = 0; |
197 | ||
198 | if (x->props.flags & XFRM_STATE_ESN) { | |
d212a4c2 SK |
199 | seqhilen += sizeof(__be32); |
200 | assoclen += seqhilen; | |
201 | } | |
202 | ||
000ae7b2 | 203 | tmp = esp_alloc_tmp(aead, nfrags, seqhilen); |
48f125ce JL |
204 | if (!tmp) { |
205 | err = -ENOMEM; | |
38320c70 | 206 | goto error; |
48f125ce | 207 | } |
38320c70 | 208 | |
d212a4c2 SK |
209 | seqhi = esp_tmp_seqhi(tmp); |
210 | iv = esp_tmp_iv(aead, tmp, seqhilen); | |
000ae7b2 HX |
211 | req = esp_tmp_req(aead, iv); |
212 | sg = esp_req_sg(aead, req); | |
1da177e4 LT |
213 | |
214 | /* Fill padding... */ | |
27a884dc | 215 | tail = skb_tail_pointer(trailer); |
040253c9 MW |
216 | if (tfclen) { |
217 | memset(tail, 0, tfclen); | |
218 | tail += tfclen; | |
219 | } | |
1da177e4 LT |
220 | do { |
221 | int i; | |
040253c9 | 222 | for (i = 0; i < plen - 2; i++) |
27a884dc | 223 | tail[i] = i + 1; |
1da177e4 | 224 | } while (0); |
040253c9 MW |
225 | tail[plen - 2] = plen - 2; |
226 | tail[plen - 1] = *skb_mac_header(skb); | |
38320c70 | 227 | pskb_put(skb, trailer, clen - skb->len + alen); |
1da177e4 | 228 | |
7b277b1a | 229 | skb_push(skb, -skb_network_offset(skb)); |
87bdc48d | 230 | esph = ip_esp_hdr(skb); |
007f0211 | 231 | *skb_mac_header(skb) = IPPROTO_ESP; |
1da177e4 | 232 | |
1ce3644a | 233 | esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low); |
1da177e4 | 234 | |
000ae7b2 HX |
235 | aead_request_set_callback(req, 0, esp_output_done, skb); |
236 | ||
237 | /* For ESN we move the header forward by 4 bytes to | |
238 | * accomodate the high bits. We will move it back after | |
239 | * encryption. | |
240 | */ | |
241 | if ((x->props.flags & XFRM_STATE_ESN)) { | |
242 | esph = (void *)(skb_transport_header(skb) - sizeof(__be32)); | |
243 | *seqhi = esph->spi; | |
244 | esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.hi); | |
245 | aead_request_set_callback(req, 0, esp_output_done_esn, skb); | |
246 | } | |
247 | ||
248 | esph->spi = x->id.spi; | |
249 | ||
38320c70 HX |
250 | sg_init_table(sg, nfrags); |
251 | skb_to_sgvec(skb, sg, | |
000ae7b2 HX |
252 | (unsigned char *)esph - skb->data, |
253 | assoclen + ivlen + clen + alen); | |
d212a4c2 | 254 | |
000ae7b2 HX |
255 | aead_request_set_crypt(req, sg, sg, ivlen + clen, iv); |
256 | aead_request_set_ad(req, assoclen); | |
257 | ||
258 | seqno = cpu_to_be64(XFRM_SKB_CB(skb)->seq.output.low + | |
259 | ((u64)XFRM_SKB_CB(skb)->seq.output.hi << 32)); | |
260 | ||
261 | memset(iv, 0, ivlen); | |
262 | memcpy(iv + ivlen - min(ivlen, 8), (u8 *)&seqno + 8 - min(ivlen, 8), | |
263 | min(ivlen, 8)); | |
1da177e4 | 264 | |
38320c70 | 265 | ESP_SKB_CB(skb)->tmp = tmp; |
000ae7b2 HX |
266 | err = crypto_aead_encrypt(req); |
267 | ||
268 | switch (err) { | |
269 | case -EINPROGRESS: | |
38320c70 | 270 | goto error; |
1da177e4 | 271 | |
000ae7b2 | 272 | case -EBUSY: |
38320c70 | 273 | err = NET_XMIT_DROP; |
000ae7b2 HX |
274 | break; |
275 | ||
276 | case 0: | |
277 | if ((x->props.flags & XFRM_STATE_ESN)) | |
278 | esp_output_restore_header(skb); | |
279 | } | |
38320c70 HX |
280 | |
281 | kfree(tmp); | |
282 | ||
283 | error: | |
284 | return err; | |
285 | } | |
286 | ||
287 | static int esp_input_done2(struct sk_buff *skb, int err) | |
288 | { | |
289 | struct xfrm_state *x = xfrm_input_state(skb); | |
1c5ad13f | 290 | struct crypto_aead *aead = x->data; |
38320c70 HX |
291 | int alen = crypto_aead_authsize(aead); |
292 | int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead); | |
293 | int elen = skb->len - hlen; | |
294 | int hdr_len = skb_network_header_len(skb); | |
295 | int padlen; | |
296 | u8 nexthdr[2]; | |
297 | ||
298 | kfree(ESP_SKB_CB(skb)->tmp); | |
1da177e4 | 299 | |
6b7326c8 | 300 | if (unlikely(err)) |
38320c70 | 301 | goto out; |
6b7326c8 | 302 | |
38320c70 HX |
303 | if (skb_copy_bits(skb, skb->len - alen - 2, nexthdr, 2)) |
304 | BUG(); | |
1da177e4 | 305 | |
38320c70 HX |
306 | err = -EINVAL; |
307 | padlen = nexthdr[0]; | |
308 | if (padlen + 2 + alen >= elen) { | |
ba7a46f1 JP |
309 | net_dbg_ratelimited("ipsec esp packet is garbage padlen=%d, elen=%d\n", |
310 | padlen + 2, elen - alen); | |
38320c70 | 311 | goto out; |
1da177e4 LT |
312 | } |
313 | ||
38320c70 | 314 | /* ... check padding bits here. Silly. :-) */ |
b7c6538c | 315 | |
38320c70 HX |
316 | pskb_trim(skb, skb->len - alen - padlen - 2); |
317 | __skb_pull(skb, hlen); | |
a9403f8a LR |
318 | if (x->props.mode == XFRM_MODE_TUNNEL) |
319 | skb_reset_transport_header(skb); | |
320 | else | |
321 | skb_set_transport_header(skb, -hdr_len); | |
38320c70 HX |
322 | |
323 | err = nexthdr[1]; | |
324 | ||
325 | /* RFC4303: Drop dummy packets without any error */ | |
326 | if (err == IPPROTO_NONE) | |
327 | err = -EINVAL; | |
328 | ||
329 | out: | |
1da177e4 LT |
330 | return err; |
331 | } | |
332 | ||
38320c70 HX |
333 | static void esp_input_done(struct crypto_async_request *base, int err) |
334 | { | |
335 | struct sk_buff *skb = base->data; | |
336 | ||
337 | xfrm_input_resume(skb, esp_input_done2(skb, err)); | |
338 | } | |
339 | ||
000ae7b2 HX |
340 | static void esp_input_restore_header(struct sk_buff *skb) |
341 | { | |
342 | esp_restore_header(skb, 0); | |
343 | __skb_pull(skb, 4); | |
344 | } | |
345 | ||
346 | static void esp_input_done_esn(struct crypto_async_request *base, int err) | |
347 | { | |
348 | struct sk_buff *skb = base->data; | |
349 | ||
350 | esp_input_restore_header(skb); | |
351 | esp_input_done(base, err); | |
352 | } | |
353 | ||
e695633e | 354 | static int esp6_input(struct xfrm_state *x, struct sk_buff *skb) |
1da177e4 | 355 | { |
87bdc48d | 356 | struct ip_esp_hdr *esph; |
1c5ad13f | 357 | struct crypto_aead *aead = x->data; |
38320c70 | 358 | struct aead_request *req; |
1da177e4 | 359 | struct sk_buff *trailer; |
000ae7b2 HX |
360 | int ivlen = crypto_aead_ivsize(aead); |
361 | int elen = skb->len - sizeof(*esph) - ivlen; | |
1da177e4 | 362 | int nfrags; |
d212a4c2 | 363 | int assoclen; |
d212a4c2 | 364 | int seqhilen; |
1da177e4 | 365 | int ret = 0; |
38320c70 | 366 | void *tmp; |
d212a4c2 | 367 | __be32 *seqhi; |
38320c70 HX |
368 | u8 *iv; |
369 | struct scatterlist *sg; | |
1da177e4 | 370 | |
000ae7b2 | 371 | if (!pskb_may_pull(skb, sizeof(*esph) + ivlen)) { |
1da177e4 | 372 | ret = -EINVAL; |
31a4ab93 | 373 | goto out; |
1da177e4 LT |
374 | } |
375 | ||
38320c70 | 376 | if (elen <= 0) { |
1da177e4 | 377 | ret = -EINVAL; |
31a4ab93 | 378 | goto out; |
1da177e4 | 379 | } |
1da177e4 | 380 | |
e5d08d71 IM |
381 | nfrags = skb_cow_data(skb, 0, &trailer); |
382 | if (nfrags < 0) { | |
0ebea8ef HX |
383 | ret = -EINVAL; |
384 | goto out; | |
385 | } | |
386 | ||
38320c70 | 387 | ret = -ENOMEM; |
d212a4c2 SK |
388 | |
389 | assoclen = sizeof(*esph); | |
d212a4c2 SK |
390 | seqhilen = 0; |
391 | ||
392 | if (x->props.flags & XFRM_STATE_ESN) { | |
d212a4c2 SK |
393 | seqhilen += sizeof(__be32); |
394 | assoclen += seqhilen; | |
395 | } | |
396 | ||
000ae7b2 | 397 | tmp = esp_alloc_tmp(aead, nfrags, seqhilen); |
38320c70 HX |
398 | if (!tmp) |
399 | goto out; | |
1da177e4 | 400 | |
38320c70 | 401 | ESP_SKB_CB(skb)->tmp = tmp; |
d212a4c2 SK |
402 | seqhi = esp_tmp_seqhi(tmp); |
403 | iv = esp_tmp_iv(aead, tmp, seqhilen); | |
38320c70 | 404 | req = esp_tmp_req(aead, iv); |
000ae7b2 | 405 | sg = esp_req_sg(aead, req); |
1da177e4 | 406 | |
38320c70 | 407 | skb->ip_summed = CHECKSUM_NONE; |
1da177e4 | 408 | |
87bdc48d | 409 | esph = (struct ip_esp_hdr *)skb->data; |
1da177e4 | 410 | |
000ae7b2 | 411 | aead_request_set_callback(req, 0, esp_input_done, skb); |
d212a4c2 | 412 | |
000ae7b2 HX |
413 | /* For ESN we move the header forward by 4 bytes to |
414 | * accomodate the high bits. We will move it back after | |
415 | * decryption. | |
416 | */ | |
d212a4c2 | 417 | if ((x->props.flags & XFRM_STATE_ESN)) { |
000ae7b2 HX |
418 | esph = (void *)skb_push(skb, 4); |
419 | *seqhi = esph->spi; | |
420 | esph->spi = esph->seq_no; | |
421 | esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.input.hi); | |
422 | aead_request_set_callback(req, 0, esp_input_done_esn, skb); | |
423 | } | |
0ebea8ef | 424 | |
000ae7b2 HX |
425 | sg_init_table(sg, nfrags); |
426 | skb_to_sgvec(skb, sg, 0, skb->len); | |
427 | ||
428 | aead_request_set_crypt(req, sg, sg, elen + ivlen, iv); | |
429 | aead_request_set_ad(req, assoclen); | |
1da177e4 | 430 | |
38320c70 HX |
431 | ret = crypto_aead_decrypt(req); |
432 | if (ret == -EINPROGRESS) | |
433 | goto out; | |
95a02cfd | 434 | |
000ae7b2 HX |
435 | if ((x->props.flags & XFRM_STATE_ESN)) |
436 | esp_input_restore_header(skb); | |
437 | ||
38320c70 | 438 | ret = esp_input_done2(skb, ret); |
1da177e4 LT |
439 | |
440 | out: | |
1da177e4 LT |
441 | return ret; |
442 | } | |
443 | ||
c5c25238 | 444 | static u32 esp6_get_mtu(struct xfrm_state *x, int mtu) |
1da177e4 | 445 | { |
1c5ad13f MK |
446 | struct crypto_aead *aead = x->data; |
447 | u32 blksize = ALIGN(crypto_aead_blocksize(aead), 4); | |
91657eaf | 448 | unsigned int net_adj; |
1da177e4 | 449 | |
91657eaf BP |
450 | if (x->props.mode != XFRM_MODE_TUNNEL) |
451 | net_adj = sizeof(struct ipv6hdr); | |
452 | else | |
453 | net_adj = 0; | |
c5c25238 | 454 | |
1c5ad13f | 455 | return ((mtu - x->props.header_len - crypto_aead_authsize(aead) - |
123b0d1b | 456 | net_adj) & ~(blksize - 1)) + net_adj - 2; |
1da177e4 LT |
457 | } |
458 | ||
d5860c5c SK |
459 | static int esp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
460 | u8 type, u8 code, int offset, __be32 info) | |
1da177e4 | 461 | { |
4fb236ba | 462 | struct net *net = dev_net(skb->dev); |
b71d1d42 | 463 | const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data; |
87bdc48d | 464 | struct ip_esp_hdr *esph = (struct ip_esp_hdr *)(skb->data + offset); |
1da177e4 LT |
465 | struct xfrm_state *x; |
466 | ||
b3b2b9e1 | 467 | if (type != ICMPV6_PKT_TOOBIG && |
ec18d9a2 | 468 | type != NDISC_REDIRECT) |
d5860c5c | 469 | return 0; |
1da177e4 | 470 | |
b71d1d42 ED |
471 | x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr, |
472 | esph->spi, IPPROTO_ESP, AF_INET6); | |
1da177e4 | 473 | if (!x) |
d5860c5c | 474 | return 0; |
ec18d9a2 DM |
475 | |
476 | if (type == NDISC_REDIRECT) | |
b55b76b2 | 477 | ip6_redirect(skb, net, skb->dev->ifindex, 0); |
ec18d9a2 DM |
478 | else |
479 | ip6_update_pmtu(skb, net, info, 0, 0); | |
1da177e4 | 480 | xfrm_state_put(x); |
d5860c5c SK |
481 | |
482 | return 0; | |
1da177e4 LT |
483 | } |
484 | ||
485 | static void esp6_destroy(struct xfrm_state *x) | |
486 | { | |
1c5ad13f | 487 | struct crypto_aead *aead = x->data; |
1da177e4 | 488 | |
1c5ad13f | 489 | if (!aead) |
1da177e4 LT |
490 | return; |
491 | ||
1c5ad13f | 492 | crypto_free_aead(aead); |
1da177e4 LT |
493 | } |
494 | ||
1a6509d9 HX |
495 | static int esp_init_aead(struct xfrm_state *x) |
496 | { | |
000ae7b2 | 497 | char aead_name[CRYPTO_MAX_ALG_NAME]; |
1a6509d9 HX |
498 | struct crypto_aead *aead; |
499 | int err; | |
500 | ||
000ae7b2 HX |
501 | err = -ENAMETOOLONG; |
502 | if (snprintf(aead_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", | |
503 | x->geniv, x->aead->alg_name) >= CRYPTO_MAX_ALG_NAME) | |
504 | goto error; | |
505 | ||
506 | aead = crypto_alloc_aead(aead_name, 0, 0); | |
1a6509d9 HX |
507 | err = PTR_ERR(aead); |
508 | if (IS_ERR(aead)) | |
509 | goto error; | |
510 | ||
1c5ad13f | 511 | x->data = aead; |
1a6509d9 HX |
512 | |
513 | err = crypto_aead_setkey(aead, x->aead->alg_key, | |
514 | (x->aead->alg_key_len + 7) / 8); | |
515 | if (err) | |
516 | goto error; | |
517 | ||
518 | err = crypto_aead_setauthsize(aead, x->aead->alg_icv_len / 8); | |
519 | if (err) | |
520 | goto error; | |
521 | ||
522 | error: | |
523 | return err; | |
524 | } | |
525 | ||
526 | static int esp_init_authenc(struct xfrm_state *x) | |
1da177e4 | 527 | { |
38320c70 HX |
528 | struct crypto_aead *aead; |
529 | struct crypto_authenc_key_param *param; | |
530 | struct rtattr *rta; | |
531 | char *key; | |
532 | char *p; | |
533 | char authenc_name[CRYPTO_MAX_ALG_NAME]; | |
38320c70 HX |
534 | unsigned int keylen; |
535 | int err; | |
1da177e4 | 536 | |
1a6509d9 | 537 | err = -EINVAL; |
63159f29 | 538 | if (!x->ealg) |
1a6509d9 | 539 | goto error; |
38320c70 | 540 | |
1a6509d9 | 541 | err = -ENAMETOOLONG; |
d212a4c2 SK |
542 | |
543 | if ((x->props.flags & XFRM_STATE_ESN)) { | |
544 | if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME, | |
000ae7b2 HX |
545 | "%s%sauthencesn(%s,%s)%s", |
546 | x->geniv ?: "", x->geniv ? "(" : "", | |
d212a4c2 | 547 | x->aalg ? x->aalg->alg_name : "digest_null", |
000ae7b2 HX |
548 | x->ealg->alg_name, |
549 | x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME) | |
d212a4c2 SK |
550 | goto error; |
551 | } else { | |
552 | if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME, | |
000ae7b2 HX |
553 | "%s%sauthenc(%s,%s)%s", |
554 | x->geniv ?: "", x->geniv ? "(" : "", | |
d212a4c2 | 555 | x->aalg ? x->aalg->alg_name : "digest_null", |
000ae7b2 HX |
556 | x->ealg->alg_name, |
557 | x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME) | |
d212a4c2 SK |
558 | goto error; |
559 | } | |
38320c70 HX |
560 | |
561 | aead = crypto_alloc_aead(authenc_name, 0, 0); | |
562 | err = PTR_ERR(aead); | |
563 | if (IS_ERR(aead)) | |
564 | goto error; | |
565 | ||
1c5ad13f | 566 | x->data = aead; |
38320c70 HX |
567 | |
568 | keylen = (x->aalg ? (x->aalg->alg_key_len + 7) / 8 : 0) + | |
569 | (x->ealg->alg_key_len + 7) / 8 + RTA_SPACE(sizeof(*param)); | |
570 | err = -ENOMEM; | |
571 | key = kmalloc(keylen, GFP_KERNEL); | |
572 | if (!key) | |
573 | goto error; | |
574 | ||
575 | p = key; | |
576 | rta = (void *)p; | |
577 | rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM; | |
578 | rta->rta_len = RTA_LENGTH(sizeof(*param)); | |
579 | param = RTA_DATA(rta); | |
580 | p += RTA_SPACE(sizeof(*param)); | |
581 | ||
1da177e4 LT |
582 | if (x->aalg) { |
583 | struct xfrm_algo_desc *aalg_desc; | |
584 | ||
38320c70 HX |
585 | memcpy(p, x->aalg->alg_key, (x->aalg->alg_key_len + 7) / 8); |
586 | p += (x->aalg->alg_key_len + 7) / 8; | |
1ab1457c | 587 | |
1da177e4 LT |
588 | aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0); |
589 | BUG_ON(!aalg_desc); | |
1ab1457c | 590 | |
38320c70 | 591 | err = -EINVAL; |
45083497 | 592 | if (aalg_desc->uinfo.auth.icv_fullbits / 8 != |
38320c70 | 593 | crypto_aead_authsize(aead)) { |
45083497 JP |
594 | pr_info("ESP: %s digestsize %u != %hu\n", |
595 | x->aalg->alg_name, | |
596 | crypto_aead_authsize(aead), | |
597 | aalg_desc->uinfo.auth.icv_fullbits / 8); | |
38320c70 | 598 | goto free_key; |
1da177e4 | 599 | } |
1ab1457c | 600 | |
38320c70 | 601 | err = crypto_aead_setauthsize( |
8f8a088c | 602 | aead, x->aalg->alg_trunc_len / 8); |
38320c70 HX |
603 | if (err) |
604 | goto free_key; | |
1da177e4 | 605 | } |
38320c70 | 606 | |
38320c70 HX |
607 | param->enckeylen = cpu_to_be32((x->ealg->alg_key_len + 7) / 8); |
608 | memcpy(p, x->ealg->alg_key, (x->ealg->alg_key_len + 7) / 8); | |
609 | ||
610 | err = crypto_aead_setkey(aead, key, keylen); | |
611 | ||
612 | free_key: | |
613 | kfree(key); | |
614 | ||
1a6509d9 HX |
615 | error: |
616 | return err; | |
617 | } | |
618 | ||
619 | static int esp6_init_state(struct xfrm_state *x) | |
620 | { | |
1a6509d9 HX |
621 | struct crypto_aead *aead; |
622 | u32 align; | |
623 | int err; | |
624 | ||
625 | if (x->encap) | |
626 | return -EINVAL; | |
627 | ||
1c5ad13f | 628 | x->data = NULL; |
1a6509d9 HX |
629 | |
630 | if (x->aead) | |
631 | err = esp_init_aead(x); | |
632 | else | |
633 | err = esp_init_authenc(x); | |
634 | ||
38320c70 | 635 | if (err) |
1da177e4 | 636 | goto error; |
38320c70 | 637 | |
1c5ad13f | 638 | aead = x->data; |
1a6509d9 | 639 | |
38320c70 HX |
640 | x->props.header_len = sizeof(struct ip_esp_hdr) + |
641 | crypto_aead_ivsize(aead); | |
ca68145f HX |
642 | switch (x->props.mode) { |
643 | case XFRM_MODE_BEET: | |
abf5cdb8 JK |
644 | if (x->sel.family != AF_INET6) |
645 | x->props.header_len += IPV4_BEET_PHMAXLEN + | |
67ba4152 | 646 | (sizeof(struct ipv6hdr) - sizeof(struct iphdr)); |
abf5cdb8 | 647 | break; |
ca68145f HX |
648 | case XFRM_MODE_TRANSPORT: |
649 | break; | |
650 | case XFRM_MODE_TUNNEL: | |
1da177e4 | 651 | x->props.header_len += sizeof(struct ipv6hdr); |
ea2c47b4 | 652 | break; |
ca68145f HX |
653 | default: |
654 | goto error; | |
655 | } | |
38320c70 HX |
656 | |
657 | align = ALIGN(crypto_aead_blocksize(aead), 4); | |
1c5ad13f | 658 | x->props.trailer_len = align + 1 + crypto_aead_authsize(aead); |
1da177e4 LT |
659 | |
660 | error: | |
38320c70 | 661 | return err; |
1da177e4 LT |
662 | } |
663 | ||
d5860c5c SK |
664 | static int esp6_rcv_cb(struct sk_buff *skb, int err) |
665 | { | |
666 | return 0; | |
667 | } | |
668 | ||
cc24beca | 669 | static const struct xfrm_type esp6_type = { |
1da177e4 | 670 | .description = "ESP6", |
cc24beca IM |
671 | .owner = THIS_MODULE, |
672 | .proto = IPPROTO_ESP, | |
436a0a40 | 673 | .flags = XFRM_TYPE_REPLAY_PROT, |
1da177e4 LT |
674 | .init_state = esp6_init_state, |
675 | .destructor = esp6_destroy, | |
c5c25238 | 676 | .get_mtu = esp6_get_mtu, |
1da177e4 | 677 | .input = esp6_input, |
aee5adb4 MN |
678 | .output = esp6_output, |
679 | .hdr_offset = xfrm6_find_1stfragopt, | |
1da177e4 LT |
680 | }; |
681 | ||
d5860c5c SK |
682 | static struct xfrm6_protocol esp6_protocol = { |
683 | .handler = xfrm6_rcv, | |
684 | .cb_handler = esp6_rcv_cb, | |
1da177e4 | 685 | .err_handler = esp6_err, |
d5860c5c | 686 | .priority = 0, |
1da177e4 LT |
687 | }; |
688 | ||
689 | static int __init esp6_init(void) | |
690 | { | |
691 | if (xfrm_register_type(&esp6_type, AF_INET6) < 0) { | |
f3213831 | 692 | pr_info("%s: can't add xfrm type\n", __func__); |
1da177e4 LT |
693 | return -EAGAIN; |
694 | } | |
d5860c5c | 695 | if (xfrm6_protocol_register(&esp6_protocol, IPPROTO_ESP) < 0) { |
f3213831 | 696 | pr_info("%s: can't add protocol\n", __func__); |
1da177e4 LT |
697 | xfrm_unregister_type(&esp6_type, AF_INET6); |
698 | return -EAGAIN; | |
699 | } | |
700 | ||
701 | return 0; | |
702 | } | |
703 | ||
704 | static void __exit esp6_fini(void) | |
705 | { | |
d5860c5c | 706 | if (xfrm6_protocol_deregister(&esp6_protocol, IPPROTO_ESP) < 0) |
f3213831 | 707 | pr_info("%s: can't remove protocol\n", __func__); |
1da177e4 | 708 | if (xfrm_unregister_type(&esp6_type, AF_INET6) < 0) |
f3213831 | 709 | pr_info("%s: can't remove xfrm type\n", __func__); |
1da177e4 LT |
710 | } |
711 | ||
712 | module_init(esp6_init); | |
713 | module_exit(esp6_fini); | |
714 | ||
715 | MODULE_LICENSE("GPL"); | |
d3d6dd3a | 716 | MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_ESP); |