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 LT |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
17 | * | |
18 | * Authors | |
19 | * | |
1ab1457c | 20 | * Mitsuru KANDA @USAGI : IPv6 Support |
1da177e4 LT |
21 | * Kazunori MIYAZAWA @USAGI : |
22 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> | |
1ab1457c | 23 | * |
1da177e4 LT |
24 | * This file is derived from net/ipv4/esp.c |
25 | */ | |
26 | ||
f3213831 JP |
27 | #define pr_fmt(fmt) "IPv6: " fmt |
28 | ||
38320c70 HX |
29 | #include <crypto/aead.h> |
30 | #include <crypto/authenc.h> | |
6b7326c8 | 31 | #include <linux/err.h> |
1da177e4 LT |
32 | #include <linux/module.h> |
33 | #include <net/ip.h> | |
34 | #include <net/xfrm.h> | |
35 | #include <net/esp.h> | |
72998d8c | 36 | #include <linux/scatterlist.h> |
a02a6422 | 37 | #include <linux/kernel.h> |
1da177e4 LT |
38 | #include <linux/pfkeyv2.h> |
39 | #include <linux/random.h> | |
38320c70 | 40 | #include <linux/slab.h> |
b7c6538c | 41 | #include <linux/spinlock.h> |
81aded24 | 42 | #include <net/ip6_route.h> |
1da177e4 LT |
43 | #include <net/icmp.h> |
44 | #include <net/ipv6.h> | |
14c85021 | 45 | #include <net/protocol.h> |
1da177e4 LT |
46 | #include <linux/icmpv6.h> |
47 | ||
38320c70 HX |
48 | struct esp_skb_cb { |
49 | struct xfrm_skb_cb xfrm; | |
50 | void *tmp; | |
51 | }; | |
52 | ||
53 | #define ESP_SKB_CB(__skb) ((struct esp_skb_cb *)&((__skb)->cb[0])) | |
54 | ||
040253c9 MW |
55 | static u32 esp6_get_mtu(struct xfrm_state *x, int mtu); |
56 | ||
38320c70 HX |
57 | /* |
58 | * Allocate an AEAD request structure with extra space for SG and IV. | |
59 | * | |
d212a4c2 SK |
60 | * For alignment considerations the upper 32 bits of the sequence number are |
61 | * placed at the front, if present. Followed by the IV, the request and finally | |
62 | * the SG list. | |
38320c70 HX |
63 | * |
64 | * TODO: Use spare space in skb for this where possible. | |
65 | */ | |
d212a4c2 | 66 | static void *esp_alloc_tmp(struct crypto_aead *aead, int nfrags, int seqihlen) |
38320c70 HX |
67 | { |
68 | unsigned int len; | |
69 | ||
d212a4c2 SK |
70 | len = seqihlen; |
71 | ||
72 | len += crypto_aead_ivsize(aead); | |
73 | ||
38320c70 HX |
74 | if (len) { |
75 | len += crypto_aead_alignmask(aead) & | |
76 | ~(crypto_tfm_ctx_alignment() - 1); | |
77 | len = ALIGN(len, crypto_tfm_ctx_alignment()); | |
78 | } | |
79 | ||
80 | len += sizeof(struct aead_givcrypt_request) + crypto_aead_reqsize(aead); | |
81 | len = ALIGN(len, __alignof__(struct scatterlist)); | |
82 | ||
83 | len += sizeof(struct scatterlist) * nfrags; | |
84 | ||
85 | return kmalloc(len, GFP_ATOMIC); | |
86 | } | |
87 | ||
d212a4c2 SK |
88 | static inline __be32 *esp_tmp_seqhi(void *tmp) |
89 | { | |
90 | return PTR_ALIGN((__be32 *)tmp, __alignof__(__be32)); | |
91 | } | |
92 | ||
93 | static inline u8 *esp_tmp_iv(struct crypto_aead *aead, void *tmp, int seqhilen) | |
38320c70 HX |
94 | { |
95 | return crypto_aead_ivsize(aead) ? | |
d212a4c2 SK |
96 | PTR_ALIGN((u8 *)tmp + seqhilen, |
97 | crypto_aead_alignmask(aead) + 1) : tmp + seqhilen; | |
38320c70 HX |
98 | } |
99 | ||
100 | static inline struct aead_givcrypt_request *esp_tmp_givreq( | |
101 | struct crypto_aead *aead, u8 *iv) | |
102 | { | |
103 | struct aead_givcrypt_request *req; | |
104 | ||
105 | req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead), | |
106 | crypto_tfm_ctx_alignment()); | |
107 | aead_givcrypt_set_tfm(req, aead); | |
108 | return req; | |
109 | } | |
110 | ||
111 | static inline struct aead_request *esp_tmp_req(struct crypto_aead *aead, u8 *iv) | |
112 | { | |
113 | struct aead_request *req; | |
114 | ||
115 | req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead), | |
116 | crypto_tfm_ctx_alignment()); | |
117 | aead_request_set_tfm(req, aead); | |
118 | return req; | |
119 | } | |
120 | ||
121 | static inline struct scatterlist *esp_req_sg(struct crypto_aead *aead, | |
122 | struct aead_request *req) | |
123 | { | |
124 | return (void *)ALIGN((unsigned long)(req + 1) + | |
125 | crypto_aead_reqsize(aead), | |
126 | __alignof__(struct scatterlist)); | |
127 | } | |
128 | ||
129 | static inline struct scatterlist *esp_givreq_sg( | |
130 | struct crypto_aead *aead, struct aead_givcrypt_request *req) | |
131 | { | |
132 | return (void *)ALIGN((unsigned long)(req + 1) + | |
133 | crypto_aead_reqsize(aead), | |
134 | __alignof__(struct scatterlist)); | |
135 | } | |
136 | ||
137 | static void esp_output_done(struct crypto_async_request *base, int err) | |
138 | { | |
139 | struct sk_buff *skb = base->data; | |
140 | ||
141 | kfree(ESP_SKB_CB(skb)->tmp); | |
142 | xfrm_output_resume(skb, err); | |
143 | } | |
144 | ||
1da177e4 LT |
145 | static int esp6_output(struct xfrm_state *x, struct sk_buff *skb) |
146 | { | |
147 | int err; | |
87bdc48d | 148 | struct ip_esp_hdr *esph; |
38320c70 HX |
149 | struct crypto_aead *aead; |
150 | struct aead_givcrypt_request *req; | |
151 | struct scatterlist *sg; | |
152 | struct scatterlist *asg; | |
1da177e4 | 153 | struct sk_buff *trailer; |
38320c70 | 154 | void *tmp; |
1da177e4 LT |
155 | int blksize; |
156 | int clen; | |
157 | int alen; | |
040253c9 MW |
158 | int plen; |
159 | int tfclen; | |
1da177e4 | 160 | int nfrags; |
d212a4c2 SK |
161 | int assoclen; |
162 | int sglists; | |
163 | int seqhilen; | |
38320c70 | 164 | u8 *iv; |
27a884dc | 165 | u8 *tail; |
d212a4c2 | 166 | __be32 *seqhi; |
ea2ae17d | 167 | struct esp_data *esp = x->data; |
1da177e4 | 168 | |
7b277b1a | 169 | /* skb is pure payload to encrypt */ |
38320c70 HX |
170 | aead = esp->aead; |
171 | alen = crypto_aead_authsize(aead); | |
172 | ||
040253c9 MW |
173 | tfclen = 0; |
174 | if (x->tfcpad) { | |
175 | struct xfrm_dst *dst = (struct xfrm_dst *)skb_dst(skb); | |
176 | u32 padto; | |
177 | ||
178 | padto = min(x->tfcpad, esp6_get_mtu(x, dst->child_mtu_cached)); | |
179 | if (skb->len < padto) | |
180 | tfclen = padto - skb->len; | |
181 | } | |
38320c70 | 182 | blksize = ALIGN(crypto_aead_blocksize(aead), 4); |
040253c9 | 183 | clen = ALIGN(skb->len + 2 + tfclen, blksize); |
38320c70 HX |
184 | if (esp->padlen) |
185 | clen = ALIGN(clen, esp->padlen); | |
040253c9 | 186 | plen = clen - skb->len - tfclen; |
1da177e4 | 187 | |
040253c9 MW |
188 | err = skb_cow_data(skb, tfclen + plen + alen, &trailer); |
189 | if (err < 0) | |
1da177e4 | 190 | goto error; |
38320c70 HX |
191 | nfrags = err; |
192 | ||
d212a4c2 SK |
193 | assoclen = sizeof(*esph); |
194 | sglists = 1; | |
195 | seqhilen = 0; | |
196 | ||
197 | if (x->props.flags & XFRM_STATE_ESN) { | |
198 | sglists += 2; | |
199 | seqhilen += sizeof(__be32); | |
200 | assoclen += seqhilen; | |
201 | } | |
202 | ||
203 | tmp = esp_alloc_tmp(aead, nfrags + sglists, 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); | |
38320c70 HX |
211 | req = esp_tmp_givreq(aead, iv); |
212 | asg = esp_givreq_sg(aead, req); | |
d212a4c2 | 213 | sg = asg + sglists; |
1da177e4 LT |
214 | |
215 | /* Fill padding... */ | |
27a884dc | 216 | tail = skb_tail_pointer(trailer); |
040253c9 MW |
217 | if (tfclen) { |
218 | memset(tail, 0, tfclen); | |
219 | tail += tfclen; | |
220 | } | |
1da177e4 LT |
221 | do { |
222 | int i; | |
040253c9 | 223 | for (i = 0; i < plen - 2; i++) |
27a884dc | 224 | tail[i] = i + 1; |
1da177e4 | 225 | } while (0); |
040253c9 MW |
226 | tail[plen - 2] = plen - 2; |
227 | tail[plen - 1] = *skb_mac_header(skb); | |
38320c70 | 228 | pskb_put(skb, trailer, clen - skb->len + alen); |
1da177e4 | 229 | |
7b277b1a | 230 | skb_push(skb, -skb_network_offset(skb)); |
87bdc48d | 231 | esph = ip_esp_hdr(skb); |
007f0211 | 232 | *skb_mac_header(skb) = IPPROTO_ESP; |
1da177e4 LT |
233 | |
234 | esph->spi = x->id.spi; | |
1ce3644a | 235 | esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low); |
1da177e4 | 236 | |
38320c70 HX |
237 | sg_init_table(sg, nfrags); |
238 | skb_to_sgvec(skb, sg, | |
239 | esph->enc_data + crypto_aead_ivsize(aead) - skb->data, | |
240 | clen + alen); | |
d212a4c2 SK |
241 | |
242 | if ((x->props.flags & XFRM_STATE_ESN)) { | |
243 | sg_init_table(asg, 3); | |
244 | sg_set_buf(asg, &esph->spi, sizeof(__be32)); | |
245 | *seqhi = htonl(XFRM_SKB_CB(skb)->seq.output.hi); | |
246 | sg_set_buf(asg + 1, seqhi, seqhilen); | |
247 | sg_set_buf(asg + 2, &esph->seq_no, sizeof(__be32)); | |
248 | } else | |
249 | sg_init_one(asg, esph, sizeof(*esph)); | |
b7c6538c | 250 | |
38320c70 HX |
251 | aead_givcrypt_set_callback(req, 0, esp_output_done, skb); |
252 | aead_givcrypt_set_crypt(req, sg, sg, clen, iv); | |
d212a4c2 | 253 | aead_givcrypt_set_assoc(req, asg, assoclen); |
b318e0e4 | 254 | aead_givcrypt_set_giv(req, esph->enc_data, |
1ce3644a | 255 | XFRM_SKB_CB(skb)->seq.output.low); |
1da177e4 | 256 | |
38320c70 HX |
257 | ESP_SKB_CB(skb)->tmp = tmp; |
258 | err = crypto_aead_givencrypt(req); | |
259 | if (err == -EINPROGRESS) | |
260 | goto error; | |
1da177e4 | 261 | |
38320c70 HX |
262 | if (err == -EBUSY) |
263 | err = NET_XMIT_DROP; | |
264 | ||
265 | kfree(tmp); | |
266 | ||
267 | error: | |
268 | return err; | |
269 | } | |
270 | ||
271 | static int esp_input_done2(struct sk_buff *skb, int err) | |
272 | { | |
273 | struct xfrm_state *x = xfrm_input_state(skb); | |
274 | struct esp_data *esp = x->data; | |
275 | struct crypto_aead *aead = esp->aead; | |
276 | int alen = crypto_aead_authsize(aead); | |
277 | int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead); | |
278 | int elen = skb->len - hlen; | |
279 | int hdr_len = skb_network_header_len(skb); | |
280 | int padlen; | |
281 | u8 nexthdr[2]; | |
282 | ||
283 | kfree(ESP_SKB_CB(skb)->tmp); | |
1da177e4 | 284 | |
6b7326c8 | 285 | if (unlikely(err)) |
38320c70 | 286 | goto out; |
6b7326c8 | 287 | |
38320c70 HX |
288 | if (skb_copy_bits(skb, skb->len - alen - 2, nexthdr, 2)) |
289 | BUG(); | |
1da177e4 | 290 | |
38320c70 HX |
291 | err = -EINVAL; |
292 | padlen = nexthdr[0]; | |
293 | if (padlen + 2 + alen >= elen) { | |
294 | LIMIT_NETDEBUG(KERN_WARNING "ipsec esp packet is garbage " | |
295 | "padlen=%d, elen=%d\n", padlen + 2, elen - alen); | |
296 | goto out; | |
1da177e4 LT |
297 | } |
298 | ||
38320c70 | 299 | /* ... check padding bits here. Silly. :-) */ |
b7c6538c | 300 | |
38320c70 HX |
301 | pskb_trim(skb, skb->len - alen - padlen - 2); |
302 | __skb_pull(skb, hlen); | |
a9403f8a LR |
303 | if (x->props.mode == XFRM_MODE_TUNNEL) |
304 | skb_reset_transport_header(skb); | |
305 | else | |
306 | skb_set_transport_header(skb, -hdr_len); | |
38320c70 HX |
307 | |
308 | err = nexthdr[1]; | |
309 | ||
310 | /* RFC4303: Drop dummy packets without any error */ | |
311 | if (err == IPPROTO_NONE) | |
312 | err = -EINVAL; | |
313 | ||
314 | out: | |
1da177e4 LT |
315 | return err; |
316 | } | |
317 | ||
38320c70 HX |
318 | static void esp_input_done(struct crypto_async_request *base, int err) |
319 | { | |
320 | struct sk_buff *skb = base->data; | |
321 | ||
322 | xfrm_input_resume(skb, esp_input_done2(skb, err)); | |
323 | } | |
324 | ||
e695633e | 325 | static int esp6_input(struct xfrm_state *x, struct sk_buff *skb) |
1da177e4 | 326 | { |
87bdc48d | 327 | struct ip_esp_hdr *esph; |
1da177e4 | 328 | struct esp_data *esp = x->data; |
38320c70 HX |
329 | struct crypto_aead *aead = esp->aead; |
330 | struct aead_request *req; | |
1da177e4 | 331 | struct sk_buff *trailer; |
38320c70 | 332 | int elen = skb->len - sizeof(*esph) - crypto_aead_ivsize(aead); |
1da177e4 | 333 | int nfrags; |
d212a4c2 SK |
334 | int assoclen; |
335 | int sglists; | |
336 | int seqhilen; | |
1da177e4 | 337 | int ret = 0; |
38320c70 | 338 | void *tmp; |
d212a4c2 | 339 | __be32 *seqhi; |
38320c70 HX |
340 | u8 *iv; |
341 | struct scatterlist *sg; | |
342 | struct scatterlist *asg; | |
1da177e4 | 343 | |
920fc941 | 344 | if (!pskb_may_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead))) { |
1da177e4 | 345 | ret = -EINVAL; |
31a4ab93 | 346 | goto out; |
1da177e4 LT |
347 | } |
348 | ||
38320c70 | 349 | if (elen <= 0) { |
1da177e4 | 350 | ret = -EINVAL; |
31a4ab93 | 351 | goto out; |
1da177e4 | 352 | } |
1da177e4 | 353 | |
0ebea8ef HX |
354 | if ((nfrags = skb_cow_data(skb, 0, &trailer)) < 0) { |
355 | ret = -EINVAL; | |
356 | goto out; | |
357 | } | |
358 | ||
38320c70 | 359 | ret = -ENOMEM; |
d212a4c2 SK |
360 | |
361 | assoclen = sizeof(*esph); | |
362 | sglists = 1; | |
363 | seqhilen = 0; | |
364 | ||
365 | if (x->props.flags & XFRM_STATE_ESN) { | |
366 | sglists += 2; | |
367 | seqhilen += sizeof(__be32); | |
368 | assoclen += seqhilen; | |
369 | } | |
370 | ||
371 | tmp = esp_alloc_tmp(aead, nfrags + sglists, seqhilen); | |
38320c70 HX |
372 | if (!tmp) |
373 | goto out; | |
1da177e4 | 374 | |
38320c70 | 375 | ESP_SKB_CB(skb)->tmp = tmp; |
d212a4c2 SK |
376 | seqhi = esp_tmp_seqhi(tmp); |
377 | iv = esp_tmp_iv(aead, tmp, seqhilen); | |
38320c70 HX |
378 | req = esp_tmp_req(aead, iv); |
379 | asg = esp_req_sg(aead, req); | |
c0a56e64 | 380 | sg = asg + sglists; |
1da177e4 | 381 | |
38320c70 | 382 | skb->ip_summed = CHECKSUM_NONE; |
1da177e4 | 383 | |
87bdc48d | 384 | esph = (struct ip_esp_hdr *)skb->data; |
1da177e4 LT |
385 | |
386 | /* Get ivec. This can be wrong, check against another impls. */ | |
38320c70 | 387 | iv = esph->enc_data; |
0ebea8ef | 388 | |
38320c70 HX |
389 | sg_init_table(sg, nfrags); |
390 | skb_to_sgvec(skb, sg, sizeof(*esph) + crypto_aead_ivsize(aead), elen); | |
d212a4c2 SK |
391 | |
392 | if ((x->props.flags & XFRM_STATE_ESN)) { | |
393 | sg_init_table(asg, 3); | |
394 | sg_set_buf(asg, &esph->spi, sizeof(__be32)); | |
395 | *seqhi = XFRM_SKB_CB(skb)->seq.input.hi; | |
396 | sg_set_buf(asg + 1, seqhi, seqhilen); | |
397 | sg_set_buf(asg + 2, &esph->seq_no, sizeof(__be32)); | |
398 | } else | |
399 | sg_init_one(asg, esph, sizeof(*esph)); | |
0ebea8ef | 400 | |
38320c70 HX |
401 | aead_request_set_callback(req, 0, esp_input_done, skb); |
402 | aead_request_set_crypt(req, sg, sg, elen, iv); | |
d212a4c2 | 403 | aead_request_set_assoc(req, asg, assoclen); |
1da177e4 | 404 | |
38320c70 HX |
405 | ret = crypto_aead_decrypt(req); |
406 | if (ret == -EINPROGRESS) | |
407 | goto out; | |
95a02cfd | 408 | |
38320c70 | 409 | ret = esp_input_done2(skb, ret); |
1da177e4 LT |
410 | |
411 | out: | |
1da177e4 LT |
412 | return ret; |
413 | } | |
414 | ||
c5c25238 | 415 | static u32 esp6_get_mtu(struct xfrm_state *x, int mtu) |
1da177e4 LT |
416 | { |
417 | struct esp_data *esp = x->data; | |
38320c70 HX |
418 | u32 blksize = ALIGN(crypto_aead_blocksize(esp->aead), 4); |
419 | u32 align = max_t(u32, blksize, esp->padlen); | |
91657eaf | 420 | unsigned int net_adj; |
1da177e4 | 421 | |
91657eaf BP |
422 | if (x->props.mode != XFRM_MODE_TUNNEL) |
423 | net_adj = sizeof(struct ipv6hdr); | |
424 | else | |
425 | net_adj = 0; | |
c5c25238 | 426 | |
91657eaf BP |
427 | return ((mtu - x->props.header_len - crypto_aead_authsize(esp->aead) - |
428 | net_adj) & ~(align - 1)) + (net_adj - 2); | |
1da177e4 LT |
429 | } |
430 | ||
431 | static void esp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 432 | u8 type, u8 code, int offset, __be32 info) |
1da177e4 | 433 | { |
4fb236ba | 434 | struct net *net = dev_net(skb->dev); |
b71d1d42 | 435 | const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data; |
87bdc48d | 436 | struct ip_esp_hdr *esph = (struct ip_esp_hdr *)(skb->data + offset); |
1da177e4 LT |
437 | struct xfrm_state *x; |
438 | ||
1ab1457c | 439 | if (type != ICMPV6_DEST_UNREACH && |
ec18d9a2 DM |
440 | type != ICMPV6_PKT_TOOBIG && |
441 | type != NDISC_REDIRECT) | |
1da177e4 LT |
442 | return; |
443 | ||
b71d1d42 ED |
444 | x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr, |
445 | esph->spi, IPPROTO_ESP, AF_INET6); | |
1da177e4 LT |
446 | if (!x) |
447 | return; | |
ec18d9a2 DM |
448 | |
449 | if (type == NDISC_REDIRECT) | |
450 | ip6_redirect(skb, net, 0, 0); | |
451 | else | |
452 | ip6_update_pmtu(skb, net, info, 0, 0); | |
1da177e4 LT |
453 | xfrm_state_put(x); |
454 | } | |
455 | ||
456 | static void esp6_destroy(struct xfrm_state *x) | |
457 | { | |
458 | struct esp_data *esp = x->data; | |
459 | ||
460 | if (!esp) | |
461 | return; | |
462 | ||
38320c70 | 463 | crypto_free_aead(esp->aead); |
1da177e4 LT |
464 | kfree(esp); |
465 | } | |
466 | ||
1a6509d9 HX |
467 | static int esp_init_aead(struct xfrm_state *x) |
468 | { | |
469 | struct esp_data *esp = x->data; | |
470 | struct crypto_aead *aead; | |
471 | int err; | |
472 | ||
473 | aead = crypto_alloc_aead(x->aead->alg_name, 0, 0); | |
474 | err = PTR_ERR(aead); | |
475 | if (IS_ERR(aead)) | |
476 | goto error; | |
477 | ||
478 | esp->aead = aead; | |
479 | ||
480 | err = crypto_aead_setkey(aead, x->aead->alg_key, | |
481 | (x->aead->alg_key_len + 7) / 8); | |
482 | if (err) | |
483 | goto error; | |
484 | ||
485 | err = crypto_aead_setauthsize(aead, x->aead->alg_icv_len / 8); | |
486 | if (err) | |
487 | goto error; | |
488 | ||
489 | error: | |
490 | return err; | |
491 | } | |
492 | ||
493 | static int esp_init_authenc(struct xfrm_state *x) | |
1da177e4 | 494 | { |
1a6509d9 | 495 | struct esp_data *esp = x->data; |
38320c70 HX |
496 | struct crypto_aead *aead; |
497 | struct crypto_authenc_key_param *param; | |
498 | struct rtattr *rta; | |
499 | char *key; | |
500 | char *p; | |
501 | char authenc_name[CRYPTO_MAX_ALG_NAME]; | |
38320c70 HX |
502 | unsigned int keylen; |
503 | int err; | |
1da177e4 | 504 | |
1a6509d9 | 505 | err = -EINVAL; |
1da177e4 | 506 | if (x->ealg == NULL) |
1a6509d9 | 507 | goto error; |
38320c70 | 508 | |
1a6509d9 | 509 | err = -ENAMETOOLONG; |
d212a4c2 SK |
510 | |
511 | if ((x->props.flags & XFRM_STATE_ESN)) { | |
512 | if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME, | |
513 | "authencesn(%s,%s)", | |
514 | x->aalg ? x->aalg->alg_name : "digest_null", | |
515 | x->ealg->alg_name) >= CRYPTO_MAX_ALG_NAME) | |
516 | goto error; | |
517 | } else { | |
518 | if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME, | |
519 | "authenc(%s,%s)", | |
520 | x->aalg ? x->aalg->alg_name : "digest_null", | |
521 | x->ealg->alg_name) >= CRYPTO_MAX_ALG_NAME) | |
522 | goto error; | |
523 | } | |
38320c70 HX |
524 | |
525 | aead = crypto_alloc_aead(authenc_name, 0, 0); | |
526 | err = PTR_ERR(aead); | |
527 | if (IS_ERR(aead)) | |
528 | goto error; | |
529 | ||
530 | esp->aead = aead; | |
531 | ||
532 | keylen = (x->aalg ? (x->aalg->alg_key_len + 7) / 8 : 0) + | |
533 | (x->ealg->alg_key_len + 7) / 8 + RTA_SPACE(sizeof(*param)); | |
534 | err = -ENOMEM; | |
535 | key = kmalloc(keylen, GFP_KERNEL); | |
536 | if (!key) | |
537 | goto error; | |
538 | ||
539 | p = key; | |
540 | rta = (void *)p; | |
541 | rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM; | |
542 | rta->rta_len = RTA_LENGTH(sizeof(*param)); | |
543 | param = RTA_DATA(rta); | |
544 | p += RTA_SPACE(sizeof(*param)); | |
545 | ||
1da177e4 LT |
546 | if (x->aalg) { |
547 | struct xfrm_algo_desc *aalg_desc; | |
548 | ||
38320c70 HX |
549 | memcpy(p, x->aalg->alg_key, (x->aalg->alg_key_len + 7) / 8); |
550 | p += (x->aalg->alg_key_len + 7) / 8; | |
1ab1457c | 551 | |
1da177e4 LT |
552 | aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0); |
553 | BUG_ON(!aalg_desc); | |
1ab1457c | 554 | |
38320c70 | 555 | err = -EINVAL; |
1da177e4 | 556 | if (aalg_desc->uinfo.auth.icv_fullbits/8 != |
38320c70 | 557 | crypto_aead_authsize(aead)) { |
07d4ee58 HX |
558 | NETDEBUG(KERN_INFO "ESP: %s digestsize %u != %hu\n", |
559 | x->aalg->alg_name, | |
38320c70 | 560 | crypto_aead_authsize(aead), |
07d4ee58 | 561 | aalg_desc->uinfo.auth.icv_fullbits/8); |
38320c70 | 562 | goto free_key; |
1da177e4 | 563 | } |
1ab1457c | 564 | |
38320c70 | 565 | err = crypto_aead_setauthsize( |
8f8a088c | 566 | aead, x->aalg->alg_trunc_len / 8); |
38320c70 HX |
567 | if (err) |
568 | goto free_key; | |
1da177e4 | 569 | } |
38320c70 | 570 | |
38320c70 HX |
571 | param->enckeylen = cpu_to_be32((x->ealg->alg_key_len + 7) / 8); |
572 | memcpy(p, x->ealg->alg_key, (x->ealg->alg_key_len + 7) / 8); | |
573 | ||
574 | err = crypto_aead_setkey(aead, key, keylen); | |
575 | ||
576 | free_key: | |
577 | kfree(key); | |
578 | ||
1a6509d9 HX |
579 | error: |
580 | return err; | |
581 | } | |
582 | ||
583 | static int esp6_init_state(struct xfrm_state *x) | |
584 | { | |
585 | struct esp_data *esp; | |
586 | struct crypto_aead *aead; | |
587 | u32 align; | |
588 | int err; | |
589 | ||
590 | if (x->encap) | |
591 | return -EINVAL; | |
592 | ||
593 | esp = kzalloc(sizeof(*esp), GFP_KERNEL); | |
594 | if (esp == NULL) | |
595 | return -ENOMEM; | |
596 | ||
597 | x->data = esp; | |
598 | ||
599 | if (x->aead) | |
600 | err = esp_init_aead(x); | |
601 | else | |
602 | err = esp_init_authenc(x); | |
603 | ||
38320c70 | 604 | if (err) |
1da177e4 | 605 | goto error; |
38320c70 | 606 | |
1a6509d9 HX |
607 | aead = esp->aead; |
608 | ||
609 | esp->padlen = 0; | |
610 | ||
38320c70 HX |
611 | x->props.header_len = sizeof(struct ip_esp_hdr) + |
612 | crypto_aead_ivsize(aead); | |
ca68145f HX |
613 | switch (x->props.mode) { |
614 | case XFRM_MODE_BEET: | |
abf5cdb8 JK |
615 | if (x->sel.family != AF_INET6) |
616 | x->props.header_len += IPV4_BEET_PHMAXLEN + | |
617 | (sizeof(struct ipv6hdr) - sizeof(struct iphdr)); | |
618 | break; | |
ca68145f HX |
619 | case XFRM_MODE_TRANSPORT: |
620 | break; | |
621 | case XFRM_MODE_TUNNEL: | |
1da177e4 | 622 | x->props.header_len += sizeof(struct ipv6hdr); |
ea2c47b4 | 623 | break; |
ca68145f HX |
624 | default: |
625 | goto error; | |
626 | } | |
38320c70 HX |
627 | |
628 | align = ALIGN(crypto_aead_blocksize(aead), 4); | |
629 | if (esp->padlen) | |
630 | align = max_t(u32, align, esp->padlen); | |
631 | x->props.trailer_len = align + 1 + crypto_aead_authsize(esp->aead); | |
1da177e4 LT |
632 | |
633 | error: | |
38320c70 | 634 | return err; |
1da177e4 LT |
635 | } |
636 | ||
533cb5b0 | 637 | static const struct xfrm_type esp6_type = |
1da177e4 LT |
638 | { |
639 | .description = "ESP6", | |
640 | .owner = THIS_MODULE, | |
641 | .proto = IPPROTO_ESP, | |
436a0a40 | 642 | .flags = XFRM_TYPE_REPLAY_PROT, |
1da177e4 LT |
643 | .init_state = esp6_init_state, |
644 | .destructor = esp6_destroy, | |
c5c25238 | 645 | .get_mtu = esp6_get_mtu, |
1da177e4 | 646 | .input = esp6_input, |
aee5adb4 MN |
647 | .output = esp6_output, |
648 | .hdr_offset = xfrm6_find_1stfragopt, | |
1da177e4 LT |
649 | }; |
650 | ||
41135cc8 | 651 | static const struct inet6_protocol esp6_protocol = { |
1da177e4 LT |
652 | .handler = xfrm6_rcv, |
653 | .err_handler = esp6_err, | |
654 | .flags = INET6_PROTO_NOPOLICY, | |
655 | }; | |
656 | ||
657 | static int __init esp6_init(void) | |
658 | { | |
659 | if (xfrm_register_type(&esp6_type, AF_INET6) < 0) { | |
f3213831 | 660 | pr_info("%s: can't add xfrm type\n", __func__); |
1da177e4 LT |
661 | return -EAGAIN; |
662 | } | |
663 | if (inet6_add_protocol(&esp6_protocol, IPPROTO_ESP) < 0) { | |
f3213831 | 664 | pr_info("%s: can't add protocol\n", __func__); |
1da177e4 LT |
665 | xfrm_unregister_type(&esp6_type, AF_INET6); |
666 | return -EAGAIN; | |
667 | } | |
668 | ||
669 | return 0; | |
670 | } | |
671 | ||
672 | static void __exit esp6_fini(void) | |
673 | { | |
674 | if (inet6_del_protocol(&esp6_protocol, IPPROTO_ESP) < 0) | |
f3213831 | 675 | pr_info("%s: can't remove protocol\n", __func__); |
1da177e4 | 676 | if (xfrm_unregister_type(&esp6_type, AF_INET6) < 0) |
f3213831 | 677 | pr_info("%s: can't remove xfrm type\n", __func__); |
1da177e4 LT |
678 | } |
679 | ||
680 | module_init(esp6_init); | |
681 | module_exit(esp6_fini); | |
682 | ||
683 | MODULE_LICENSE("GPL"); | |
d3d6dd3a | 684 | MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_ESP); |