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 | ||
79 | len += sizeof(struct aead_givcrypt_request) + crypto_aead_reqsize(aead); | |
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 | ||
99 | static inline struct aead_givcrypt_request *esp_tmp_givreq( | |
100 | struct crypto_aead *aead, u8 *iv) | |
101 | { | |
102 | struct aead_givcrypt_request *req; | |
103 | ||
104 | req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead), | |
105 | crypto_tfm_ctx_alignment()); | |
106 | aead_givcrypt_set_tfm(req, aead); | |
107 | return req; | |
108 | } | |
109 | ||
110 | static inline struct aead_request *esp_tmp_req(struct crypto_aead *aead, u8 *iv) | |
111 | { | |
112 | struct aead_request *req; | |
113 | ||
114 | req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead), | |
115 | crypto_tfm_ctx_alignment()); | |
116 | aead_request_set_tfm(req, aead); | |
117 | return req; | |
118 | } | |
119 | ||
120 | static inline struct scatterlist *esp_req_sg(struct crypto_aead *aead, | |
121 | struct aead_request *req) | |
122 | { | |
123 | return (void *)ALIGN((unsigned long)(req + 1) + | |
124 | crypto_aead_reqsize(aead), | |
125 | __alignof__(struct scatterlist)); | |
126 | } | |
127 | ||
128 | static inline struct scatterlist *esp_givreq_sg( | |
129 | struct crypto_aead *aead, struct aead_givcrypt_request *req) | |
130 | { | |
131 | return (void *)ALIGN((unsigned long)(req + 1) + | |
132 | crypto_aead_reqsize(aead), | |
133 | __alignof__(struct scatterlist)); | |
134 | } | |
135 | ||
136 | static void esp_output_done(struct crypto_async_request *base, int err) | |
137 | { | |
138 | struct sk_buff *skb = base->data; | |
139 | ||
140 | kfree(ESP_SKB_CB(skb)->tmp); | |
141 | xfrm_output_resume(skb, err); | |
142 | } | |
143 | ||
1da177e4 LT |
144 | static int esp6_output(struct xfrm_state *x, struct sk_buff *skb) |
145 | { | |
146 | int err; | |
87bdc48d | 147 | struct ip_esp_hdr *esph; |
38320c70 HX |
148 | struct crypto_aead *aead; |
149 | struct aead_givcrypt_request *req; | |
150 | struct scatterlist *sg; | |
151 | struct scatterlist *asg; | |
1da177e4 | 152 | struct sk_buff *trailer; |
38320c70 | 153 | void *tmp; |
1da177e4 LT |
154 | int blksize; |
155 | int clen; | |
156 | int alen; | |
040253c9 MW |
157 | int plen; |
158 | int tfclen; | |
1da177e4 | 159 | int nfrags; |
d212a4c2 SK |
160 | int assoclen; |
161 | int sglists; | |
162 | int seqhilen; | |
38320c70 | 163 | u8 *iv; |
27a884dc | 164 | u8 *tail; |
d212a4c2 | 165 | __be32 *seqhi; |
1da177e4 | 166 | |
7b277b1a | 167 | /* skb is pure payload to encrypt */ |
1c5ad13f | 168 | aead = x->data; |
38320c70 HX |
169 | alen = crypto_aead_authsize(aead); |
170 | ||
040253c9 MW |
171 | tfclen = 0; |
172 | if (x->tfcpad) { | |
173 | struct xfrm_dst *dst = (struct xfrm_dst *)skb_dst(skb); | |
174 | u32 padto; | |
175 | ||
176 | padto = min(x->tfcpad, esp6_get_mtu(x, dst->child_mtu_cached)); | |
177 | if (skb->len < padto) | |
178 | tfclen = padto - skb->len; | |
179 | } | |
38320c70 | 180 | blksize = ALIGN(crypto_aead_blocksize(aead), 4); |
040253c9 | 181 | clen = ALIGN(skb->len + 2 + tfclen, blksize); |
040253c9 | 182 | plen = clen - skb->len - tfclen; |
1da177e4 | 183 | |
040253c9 MW |
184 | err = skb_cow_data(skb, tfclen + plen + alen, &trailer); |
185 | if (err < 0) | |
1da177e4 | 186 | goto error; |
38320c70 HX |
187 | nfrags = err; |
188 | ||
d212a4c2 SK |
189 | assoclen = sizeof(*esph); |
190 | sglists = 1; | |
191 | seqhilen = 0; | |
192 | ||
193 | if (x->props.flags & XFRM_STATE_ESN) { | |
194 | sglists += 2; | |
195 | seqhilen += sizeof(__be32); | |
196 | assoclen += seqhilen; | |
197 | } | |
198 | ||
199 | tmp = esp_alloc_tmp(aead, nfrags + sglists, seqhilen); | |
48f125ce JL |
200 | if (!tmp) { |
201 | err = -ENOMEM; | |
38320c70 | 202 | goto error; |
48f125ce | 203 | } |
38320c70 | 204 | |
d212a4c2 SK |
205 | seqhi = esp_tmp_seqhi(tmp); |
206 | iv = esp_tmp_iv(aead, tmp, seqhilen); | |
38320c70 HX |
207 | req = esp_tmp_givreq(aead, iv); |
208 | asg = esp_givreq_sg(aead, req); | |
d212a4c2 | 209 | sg = asg + sglists; |
1da177e4 LT |
210 | |
211 | /* Fill padding... */ | |
27a884dc | 212 | tail = skb_tail_pointer(trailer); |
040253c9 MW |
213 | if (tfclen) { |
214 | memset(tail, 0, tfclen); | |
215 | tail += tfclen; | |
216 | } | |
1da177e4 LT |
217 | do { |
218 | int i; | |
040253c9 | 219 | for (i = 0; i < plen - 2; i++) |
27a884dc | 220 | tail[i] = i + 1; |
1da177e4 | 221 | } while (0); |
040253c9 MW |
222 | tail[plen - 2] = plen - 2; |
223 | tail[plen - 1] = *skb_mac_header(skb); | |
38320c70 | 224 | pskb_put(skb, trailer, clen - skb->len + alen); |
1da177e4 | 225 | |
7b277b1a | 226 | skb_push(skb, -skb_network_offset(skb)); |
87bdc48d | 227 | esph = ip_esp_hdr(skb); |
007f0211 | 228 | *skb_mac_header(skb) = IPPROTO_ESP; |
1da177e4 LT |
229 | |
230 | esph->spi = x->id.spi; | |
1ce3644a | 231 | esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low); |
1da177e4 | 232 | |
38320c70 HX |
233 | sg_init_table(sg, nfrags); |
234 | skb_to_sgvec(skb, sg, | |
235 | esph->enc_data + crypto_aead_ivsize(aead) - skb->data, | |
236 | clen + alen); | |
d212a4c2 SK |
237 | |
238 | if ((x->props.flags & XFRM_STATE_ESN)) { | |
239 | sg_init_table(asg, 3); | |
240 | sg_set_buf(asg, &esph->spi, sizeof(__be32)); | |
241 | *seqhi = htonl(XFRM_SKB_CB(skb)->seq.output.hi); | |
242 | sg_set_buf(asg + 1, seqhi, seqhilen); | |
243 | sg_set_buf(asg + 2, &esph->seq_no, sizeof(__be32)); | |
244 | } else | |
245 | sg_init_one(asg, esph, sizeof(*esph)); | |
b7c6538c | 246 | |
38320c70 HX |
247 | aead_givcrypt_set_callback(req, 0, esp_output_done, skb); |
248 | aead_givcrypt_set_crypt(req, sg, sg, clen, iv); | |
d212a4c2 | 249 | aead_givcrypt_set_assoc(req, asg, assoclen); |
b318e0e4 | 250 | aead_givcrypt_set_giv(req, esph->enc_data, |
1ce3644a | 251 | XFRM_SKB_CB(skb)->seq.output.low); |
1da177e4 | 252 | |
38320c70 HX |
253 | ESP_SKB_CB(skb)->tmp = tmp; |
254 | err = crypto_aead_givencrypt(req); | |
255 | if (err == -EINPROGRESS) | |
256 | goto error; | |
1da177e4 | 257 | |
38320c70 HX |
258 | if (err == -EBUSY) |
259 | err = NET_XMIT_DROP; | |
260 | ||
261 | kfree(tmp); | |
262 | ||
263 | error: | |
264 | return err; | |
265 | } | |
266 | ||
267 | static int esp_input_done2(struct sk_buff *skb, int err) | |
268 | { | |
269 | struct xfrm_state *x = xfrm_input_state(skb); | |
1c5ad13f | 270 | struct crypto_aead *aead = x->data; |
38320c70 HX |
271 | int alen = crypto_aead_authsize(aead); |
272 | int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead); | |
273 | int elen = skb->len - hlen; | |
274 | int hdr_len = skb_network_header_len(skb); | |
275 | int padlen; | |
276 | u8 nexthdr[2]; | |
277 | ||
278 | kfree(ESP_SKB_CB(skb)->tmp); | |
1da177e4 | 279 | |
6b7326c8 | 280 | if (unlikely(err)) |
38320c70 | 281 | goto out; |
6b7326c8 | 282 | |
38320c70 HX |
283 | if (skb_copy_bits(skb, skb->len - alen - 2, nexthdr, 2)) |
284 | BUG(); | |
1da177e4 | 285 | |
38320c70 HX |
286 | err = -EINVAL; |
287 | padlen = nexthdr[0]; | |
288 | if (padlen + 2 + alen >= elen) { | |
ba7a46f1 JP |
289 | net_dbg_ratelimited("ipsec esp packet is garbage padlen=%d, elen=%d\n", |
290 | padlen + 2, elen - alen); | |
38320c70 | 291 | goto out; |
1da177e4 LT |
292 | } |
293 | ||
38320c70 | 294 | /* ... check padding bits here. Silly. :-) */ |
b7c6538c | 295 | |
38320c70 HX |
296 | pskb_trim(skb, skb->len - alen - padlen - 2); |
297 | __skb_pull(skb, hlen); | |
a9403f8a LR |
298 | if (x->props.mode == XFRM_MODE_TUNNEL) |
299 | skb_reset_transport_header(skb); | |
300 | else | |
301 | skb_set_transport_header(skb, -hdr_len); | |
38320c70 HX |
302 | |
303 | err = nexthdr[1]; | |
304 | ||
305 | /* RFC4303: Drop dummy packets without any error */ | |
306 | if (err == IPPROTO_NONE) | |
307 | err = -EINVAL; | |
308 | ||
309 | out: | |
1da177e4 LT |
310 | return err; |
311 | } | |
312 | ||
38320c70 HX |
313 | static void esp_input_done(struct crypto_async_request *base, int err) |
314 | { | |
315 | struct sk_buff *skb = base->data; | |
316 | ||
317 | xfrm_input_resume(skb, esp_input_done2(skb, err)); | |
318 | } | |
319 | ||
e695633e | 320 | static int esp6_input(struct xfrm_state *x, struct sk_buff *skb) |
1da177e4 | 321 | { |
87bdc48d | 322 | struct ip_esp_hdr *esph; |
1c5ad13f | 323 | struct crypto_aead *aead = x->data; |
38320c70 | 324 | struct aead_request *req; |
1da177e4 | 325 | struct sk_buff *trailer; |
38320c70 | 326 | int elen = skb->len - sizeof(*esph) - crypto_aead_ivsize(aead); |
1da177e4 | 327 | int nfrags; |
d212a4c2 SK |
328 | int assoclen; |
329 | int sglists; | |
330 | int seqhilen; | |
1da177e4 | 331 | int ret = 0; |
38320c70 | 332 | void *tmp; |
d212a4c2 | 333 | __be32 *seqhi; |
38320c70 HX |
334 | u8 *iv; |
335 | struct scatterlist *sg; | |
336 | struct scatterlist *asg; | |
1da177e4 | 337 | |
920fc941 | 338 | if (!pskb_may_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead))) { |
1da177e4 | 339 | ret = -EINVAL; |
31a4ab93 | 340 | goto out; |
1da177e4 LT |
341 | } |
342 | ||
38320c70 | 343 | if (elen <= 0) { |
1da177e4 | 344 | ret = -EINVAL; |
31a4ab93 | 345 | goto out; |
1da177e4 | 346 | } |
1da177e4 | 347 | |
e5d08d71 IM |
348 | nfrags = skb_cow_data(skb, 0, &trailer); |
349 | if (nfrags < 0) { | |
0ebea8ef HX |
350 | ret = -EINVAL; |
351 | goto out; | |
352 | } | |
353 | ||
38320c70 | 354 | ret = -ENOMEM; |
d212a4c2 SK |
355 | |
356 | assoclen = sizeof(*esph); | |
357 | sglists = 1; | |
358 | seqhilen = 0; | |
359 | ||
360 | if (x->props.flags & XFRM_STATE_ESN) { | |
361 | sglists += 2; | |
362 | seqhilen += sizeof(__be32); | |
363 | assoclen += seqhilen; | |
364 | } | |
365 | ||
366 | tmp = esp_alloc_tmp(aead, nfrags + sglists, seqhilen); | |
38320c70 HX |
367 | if (!tmp) |
368 | goto out; | |
1da177e4 | 369 | |
38320c70 | 370 | ESP_SKB_CB(skb)->tmp = tmp; |
d212a4c2 SK |
371 | seqhi = esp_tmp_seqhi(tmp); |
372 | iv = esp_tmp_iv(aead, tmp, seqhilen); | |
38320c70 HX |
373 | req = esp_tmp_req(aead, iv); |
374 | asg = esp_req_sg(aead, req); | |
c0a56e64 | 375 | sg = asg + sglists; |
1da177e4 | 376 | |
38320c70 | 377 | skb->ip_summed = CHECKSUM_NONE; |
1da177e4 | 378 | |
87bdc48d | 379 | esph = (struct ip_esp_hdr *)skb->data; |
1da177e4 LT |
380 | |
381 | /* Get ivec. This can be wrong, check against another impls. */ | |
38320c70 | 382 | iv = esph->enc_data; |
0ebea8ef | 383 | |
38320c70 HX |
384 | sg_init_table(sg, nfrags); |
385 | skb_to_sgvec(skb, sg, sizeof(*esph) + crypto_aead_ivsize(aead), elen); | |
d212a4c2 SK |
386 | |
387 | if ((x->props.flags & XFRM_STATE_ESN)) { | |
388 | sg_init_table(asg, 3); | |
389 | sg_set_buf(asg, &esph->spi, sizeof(__be32)); | |
390 | *seqhi = XFRM_SKB_CB(skb)->seq.input.hi; | |
391 | sg_set_buf(asg + 1, seqhi, seqhilen); | |
392 | sg_set_buf(asg + 2, &esph->seq_no, sizeof(__be32)); | |
393 | } else | |
394 | sg_init_one(asg, esph, sizeof(*esph)); | |
0ebea8ef | 395 | |
38320c70 HX |
396 | aead_request_set_callback(req, 0, esp_input_done, skb); |
397 | aead_request_set_crypt(req, sg, sg, elen, iv); | |
d212a4c2 | 398 | aead_request_set_assoc(req, asg, assoclen); |
1da177e4 | 399 | |
38320c70 HX |
400 | ret = crypto_aead_decrypt(req); |
401 | if (ret == -EINPROGRESS) | |
402 | goto out; | |
95a02cfd | 403 | |
38320c70 | 404 | ret = esp_input_done2(skb, ret); |
1da177e4 LT |
405 | |
406 | out: | |
1da177e4 LT |
407 | return ret; |
408 | } | |
409 | ||
c5c25238 | 410 | static u32 esp6_get_mtu(struct xfrm_state *x, int mtu) |
1da177e4 | 411 | { |
1c5ad13f MK |
412 | struct crypto_aead *aead = x->data; |
413 | u32 blksize = ALIGN(crypto_aead_blocksize(aead), 4); | |
91657eaf | 414 | unsigned int net_adj; |
1da177e4 | 415 | |
91657eaf BP |
416 | if (x->props.mode != XFRM_MODE_TUNNEL) |
417 | net_adj = sizeof(struct ipv6hdr); | |
418 | else | |
419 | net_adj = 0; | |
c5c25238 | 420 | |
1c5ad13f | 421 | return ((mtu - x->props.header_len - crypto_aead_authsize(aead) - |
123b0d1b | 422 | net_adj) & ~(blksize - 1)) + net_adj - 2; |
1da177e4 LT |
423 | } |
424 | ||
d5860c5c SK |
425 | static int esp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
426 | u8 type, u8 code, int offset, __be32 info) | |
1da177e4 | 427 | { |
4fb236ba | 428 | struct net *net = dev_net(skb->dev); |
b71d1d42 | 429 | const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data; |
87bdc48d | 430 | struct ip_esp_hdr *esph = (struct ip_esp_hdr *)(skb->data + offset); |
1da177e4 LT |
431 | struct xfrm_state *x; |
432 | ||
b3b2b9e1 | 433 | if (type != ICMPV6_PKT_TOOBIG && |
ec18d9a2 | 434 | type != NDISC_REDIRECT) |
d5860c5c | 435 | return 0; |
1da177e4 | 436 | |
b71d1d42 ED |
437 | x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr, |
438 | esph->spi, IPPROTO_ESP, AF_INET6); | |
1da177e4 | 439 | if (!x) |
d5860c5c | 440 | return 0; |
ec18d9a2 DM |
441 | |
442 | if (type == NDISC_REDIRECT) | |
b55b76b2 | 443 | ip6_redirect(skb, net, skb->dev->ifindex, 0); |
ec18d9a2 DM |
444 | else |
445 | ip6_update_pmtu(skb, net, info, 0, 0); | |
1da177e4 | 446 | xfrm_state_put(x); |
d5860c5c SK |
447 | |
448 | return 0; | |
1da177e4 LT |
449 | } |
450 | ||
451 | static void esp6_destroy(struct xfrm_state *x) | |
452 | { | |
1c5ad13f | 453 | struct crypto_aead *aead = x->data; |
1da177e4 | 454 | |
1c5ad13f | 455 | if (!aead) |
1da177e4 LT |
456 | return; |
457 | ||
1c5ad13f | 458 | crypto_free_aead(aead); |
1da177e4 LT |
459 | } |
460 | ||
1a6509d9 HX |
461 | static int esp_init_aead(struct xfrm_state *x) |
462 | { | |
1a6509d9 HX |
463 | struct crypto_aead *aead; |
464 | int err; | |
465 | ||
466 | aead = crypto_alloc_aead(x->aead->alg_name, 0, 0); | |
467 | err = PTR_ERR(aead); | |
468 | if (IS_ERR(aead)) | |
469 | goto error; | |
470 | ||
1c5ad13f | 471 | x->data = aead; |
1a6509d9 HX |
472 | |
473 | err = crypto_aead_setkey(aead, x->aead->alg_key, | |
474 | (x->aead->alg_key_len + 7) / 8); | |
475 | if (err) | |
476 | goto error; | |
477 | ||
478 | err = crypto_aead_setauthsize(aead, x->aead->alg_icv_len / 8); | |
479 | if (err) | |
480 | goto error; | |
481 | ||
482 | error: | |
483 | return err; | |
484 | } | |
485 | ||
486 | static int esp_init_authenc(struct xfrm_state *x) | |
1da177e4 | 487 | { |
38320c70 HX |
488 | struct crypto_aead *aead; |
489 | struct crypto_authenc_key_param *param; | |
490 | struct rtattr *rta; | |
491 | char *key; | |
492 | char *p; | |
493 | char authenc_name[CRYPTO_MAX_ALG_NAME]; | |
38320c70 HX |
494 | unsigned int keylen; |
495 | int err; | |
1da177e4 | 496 | |
1a6509d9 | 497 | err = -EINVAL; |
1da177e4 | 498 | if (x->ealg == NULL) |
1a6509d9 | 499 | goto error; |
38320c70 | 500 | |
1a6509d9 | 501 | err = -ENAMETOOLONG; |
d212a4c2 SK |
502 | |
503 | if ((x->props.flags & XFRM_STATE_ESN)) { | |
504 | if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME, | |
505 | "authencesn(%s,%s)", | |
506 | x->aalg ? x->aalg->alg_name : "digest_null", | |
507 | x->ealg->alg_name) >= CRYPTO_MAX_ALG_NAME) | |
508 | goto error; | |
509 | } else { | |
510 | if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME, | |
511 | "authenc(%s,%s)", | |
512 | x->aalg ? x->aalg->alg_name : "digest_null", | |
513 | x->ealg->alg_name) >= CRYPTO_MAX_ALG_NAME) | |
514 | goto error; | |
515 | } | |
38320c70 HX |
516 | |
517 | aead = crypto_alloc_aead(authenc_name, 0, 0); | |
518 | err = PTR_ERR(aead); | |
519 | if (IS_ERR(aead)) | |
520 | goto error; | |
521 | ||
1c5ad13f | 522 | x->data = aead; |
38320c70 HX |
523 | |
524 | keylen = (x->aalg ? (x->aalg->alg_key_len + 7) / 8 : 0) + | |
525 | (x->ealg->alg_key_len + 7) / 8 + RTA_SPACE(sizeof(*param)); | |
526 | err = -ENOMEM; | |
527 | key = kmalloc(keylen, GFP_KERNEL); | |
528 | if (!key) | |
529 | goto error; | |
530 | ||
531 | p = key; | |
532 | rta = (void *)p; | |
533 | rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM; | |
534 | rta->rta_len = RTA_LENGTH(sizeof(*param)); | |
535 | param = RTA_DATA(rta); | |
536 | p += RTA_SPACE(sizeof(*param)); | |
537 | ||
1da177e4 LT |
538 | if (x->aalg) { |
539 | struct xfrm_algo_desc *aalg_desc; | |
540 | ||
38320c70 HX |
541 | memcpy(p, x->aalg->alg_key, (x->aalg->alg_key_len + 7) / 8); |
542 | p += (x->aalg->alg_key_len + 7) / 8; | |
1ab1457c | 543 | |
1da177e4 LT |
544 | aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0); |
545 | BUG_ON(!aalg_desc); | |
1ab1457c | 546 | |
38320c70 | 547 | err = -EINVAL; |
45083497 | 548 | if (aalg_desc->uinfo.auth.icv_fullbits / 8 != |
38320c70 | 549 | crypto_aead_authsize(aead)) { |
45083497 JP |
550 | pr_info("ESP: %s digestsize %u != %hu\n", |
551 | x->aalg->alg_name, | |
552 | crypto_aead_authsize(aead), | |
553 | aalg_desc->uinfo.auth.icv_fullbits / 8); | |
38320c70 | 554 | goto free_key; |
1da177e4 | 555 | } |
1ab1457c | 556 | |
38320c70 | 557 | err = crypto_aead_setauthsize( |
8f8a088c | 558 | aead, x->aalg->alg_trunc_len / 8); |
38320c70 HX |
559 | if (err) |
560 | goto free_key; | |
1da177e4 | 561 | } |
38320c70 | 562 | |
38320c70 HX |
563 | param->enckeylen = cpu_to_be32((x->ealg->alg_key_len + 7) / 8); |
564 | memcpy(p, x->ealg->alg_key, (x->ealg->alg_key_len + 7) / 8); | |
565 | ||
566 | err = crypto_aead_setkey(aead, key, keylen); | |
567 | ||
568 | free_key: | |
569 | kfree(key); | |
570 | ||
1a6509d9 HX |
571 | error: |
572 | return err; | |
573 | } | |
574 | ||
575 | static int esp6_init_state(struct xfrm_state *x) | |
576 | { | |
1a6509d9 HX |
577 | struct crypto_aead *aead; |
578 | u32 align; | |
579 | int err; | |
580 | ||
581 | if (x->encap) | |
582 | return -EINVAL; | |
583 | ||
1c5ad13f | 584 | x->data = NULL; |
1a6509d9 HX |
585 | |
586 | if (x->aead) | |
587 | err = esp_init_aead(x); | |
588 | else | |
589 | err = esp_init_authenc(x); | |
590 | ||
38320c70 | 591 | if (err) |
1da177e4 | 592 | goto error; |
38320c70 | 593 | |
1c5ad13f | 594 | aead = x->data; |
1a6509d9 | 595 | |
38320c70 HX |
596 | x->props.header_len = sizeof(struct ip_esp_hdr) + |
597 | crypto_aead_ivsize(aead); | |
ca68145f HX |
598 | switch (x->props.mode) { |
599 | case XFRM_MODE_BEET: | |
abf5cdb8 JK |
600 | if (x->sel.family != AF_INET6) |
601 | x->props.header_len += IPV4_BEET_PHMAXLEN + | |
67ba4152 | 602 | (sizeof(struct ipv6hdr) - sizeof(struct iphdr)); |
abf5cdb8 | 603 | break; |
ca68145f HX |
604 | case XFRM_MODE_TRANSPORT: |
605 | break; | |
606 | case XFRM_MODE_TUNNEL: | |
1da177e4 | 607 | x->props.header_len += sizeof(struct ipv6hdr); |
ea2c47b4 | 608 | break; |
ca68145f HX |
609 | default: |
610 | goto error; | |
611 | } | |
38320c70 HX |
612 | |
613 | align = ALIGN(crypto_aead_blocksize(aead), 4); | |
1c5ad13f | 614 | x->props.trailer_len = align + 1 + crypto_aead_authsize(aead); |
1da177e4 LT |
615 | |
616 | error: | |
38320c70 | 617 | return err; |
1da177e4 LT |
618 | } |
619 | ||
d5860c5c SK |
620 | static int esp6_rcv_cb(struct sk_buff *skb, int err) |
621 | { | |
622 | return 0; | |
623 | } | |
624 | ||
cc24beca | 625 | static const struct xfrm_type esp6_type = { |
1da177e4 | 626 | .description = "ESP6", |
cc24beca IM |
627 | .owner = THIS_MODULE, |
628 | .proto = IPPROTO_ESP, | |
436a0a40 | 629 | .flags = XFRM_TYPE_REPLAY_PROT, |
1da177e4 LT |
630 | .init_state = esp6_init_state, |
631 | .destructor = esp6_destroy, | |
c5c25238 | 632 | .get_mtu = esp6_get_mtu, |
1da177e4 | 633 | .input = esp6_input, |
aee5adb4 MN |
634 | .output = esp6_output, |
635 | .hdr_offset = xfrm6_find_1stfragopt, | |
1da177e4 LT |
636 | }; |
637 | ||
d5860c5c SK |
638 | static struct xfrm6_protocol esp6_protocol = { |
639 | .handler = xfrm6_rcv, | |
640 | .cb_handler = esp6_rcv_cb, | |
1da177e4 | 641 | .err_handler = esp6_err, |
d5860c5c | 642 | .priority = 0, |
1da177e4 LT |
643 | }; |
644 | ||
645 | static int __init esp6_init(void) | |
646 | { | |
647 | if (xfrm_register_type(&esp6_type, AF_INET6) < 0) { | |
f3213831 | 648 | pr_info("%s: can't add xfrm type\n", __func__); |
1da177e4 LT |
649 | return -EAGAIN; |
650 | } | |
d5860c5c | 651 | if (xfrm6_protocol_register(&esp6_protocol, IPPROTO_ESP) < 0) { |
f3213831 | 652 | pr_info("%s: can't add protocol\n", __func__); |
1da177e4 LT |
653 | xfrm_unregister_type(&esp6_type, AF_INET6); |
654 | return -EAGAIN; | |
655 | } | |
656 | ||
657 | return 0; | |
658 | } | |
659 | ||
660 | static void __exit esp6_fini(void) | |
661 | { | |
d5860c5c | 662 | if (xfrm6_protocol_deregister(&esp6_protocol, IPPROTO_ESP) < 0) |
f3213831 | 663 | pr_info("%s: can't remove protocol\n", __func__); |
1da177e4 | 664 | if (xfrm_unregister_type(&esp6_type, AF_INET6) < 0) |
f3213831 | 665 | pr_info("%s: can't remove xfrm type\n", __func__); |
1da177e4 LT |
666 | } |
667 | ||
668 | module_init(esp6_init); | |
669 | module_exit(esp6_fini); | |
670 | ||
671 | MODULE_LICENSE("GPL"); | |
d3d6dd3a | 672 | MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_ESP); |