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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 | ||
03e2a30f SK |
47 | #include <linux/highmem.h> |
48 | ||
38320c70 HX |
49 | struct esp_skb_cb { |
50 | struct xfrm_skb_cb xfrm; | |
51 | void *tmp; | |
52 | }; | |
53 | ||
54 | #define ESP_SKB_CB(__skb) ((struct esp_skb_cb *)&((__skb)->cb[0])) | |
55 | ||
040253c9 MW |
56 | static u32 esp6_get_mtu(struct xfrm_state *x, int mtu); |
57 | ||
38320c70 HX |
58 | /* |
59 | * Allocate an AEAD request structure with extra space for SG and IV. | |
60 | * | |
d212a4c2 SK |
61 | * For alignment considerations the upper 32 bits of the sequence number are |
62 | * placed at the front, if present. Followed by the IV, the request and finally | |
63 | * the SG list. | |
38320c70 HX |
64 | * |
65 | * TODO: Use spare space in skb for this where possible. | |
66 | */ | |
d212a4c2 | 67 | static void *esp_alloc_tmp(struct crypto_aead *aead, int nfrags, int seqihlen) |
38320c70 HX |
68 | { |
69 | unsigned int len; | |
70 | ||
d212a4c2 SK |
71 | len = seqihlen; |
72 | ||
73 | len += crypto_aead_ivsize(aead); | |
74 | ||
38320c70 HX |
75 | if (len) { |
76 | len += crypto_aead_alignmask(aead) & | |
77 | ~(crypto_tfm_ctx_alignment() - 1); | |
78 | len = ALIGN(len, crypto_tfm_ctx_alignment()); | |
79 | } | |
80 | ||
000ae7b2 | 81 | len += sizeof(struct aead_request) + crypto_aead_reqsize(aead); |
38320c70 HX |
82 | len = ALIGN(len, __alignof__(struct scatterlist)); |
83 | ||
84 | len += sizeof(struct scatterlist) * nfrags; | |
85 | ||
86 | return kmalloc(len, GFP_ATOMIC); | |
87 | } | |
88 | ||
d212a4c2 SK |
89 | static inline __be32 *esp_tmp_seqhi(void *tmp) |
90 | { | |
91 | return PTR_ALIGN((__be32 *)tmp, __alignof__(__be32)); | |
92 | } | |
93 | ||
94 | static inline u8 *esp_tmp_iv(struct crypto_aead *aead, void *tmp, int seqhilen) | |
38320c70 HX |
95 | { |
96 | return crypto_aead_ivsize(aead) ? | |
d212a4c2 SK |
97 | PTR_ALIGN((u8 *)tmp + seqhilen, |
98 | crypto_aead_alignmask(aead) + 1) : tmp + seqhilen; | |
38320c70 HX |
99 | } |
100 | ||
38320c70 HX |
101 | static inline struct aead_request *esp_tmp_req(struct crypto_aead *aead, u8 *iv) |
102 | { | |
103 | struct aead_request *req; | |
104 | ||
105 | req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead), | |
106 | crypto_tfm_ctx_alignment()); | |
107 | aead_request_set_tfm(req, aead); | |
108 | return req; | |
109 | } | |
110 | ||
111 | static inline struct scatterlist *esp_req_sg(struct crypto_aead *aead, | |
112 | struct aead_request *req) | |
113 | { | |
114 | return (void *)ALIGN((unsigned long)(req + 1) + | |
115 | crypto_aead_reqsize(aead), | |
116 | __alignof__(struct scatterlist)); | |
117 | } | |
118 | ||
03e2a30f SK |
119 | static void esp_ssg_unref(struct xfrm_state *x, void *tmp) |
120 | { | |
03e2a30f SK |
121 | struct crypto_aead *aead = x->data; |
122 | int seqhilen = 0; | |
123 | u8 *iv; | |
124 | struct aead_request *req; | |
125 | struct scatterlist *sg; | |
126 | ||
127 | if (x->props.flags & XFRM_STATE_ESN) | |
128 | seqhilen += sizeof(__be32); | |
129 | ||
03e2a30f SK |
130 | iv = esp_tmp_iv(aead, tmp, seqhilen); |
131 | req = esp_tmp_req(aead, iv); | |
132 | ||
133 | /* Unref skb_frag_pages in the src scatterlist if necessary. | |
134 | * Skip the first sg which comes from skb->data. | |
135 | */ | |
136 | if (req->src != req->dst) | |
137 | for (sg = sg_next(req->src); sg; sg = sg_next(sg)) | |
138 | put_page(sg_page(sg)); | |
139 | } | |
140 | ||
38320c70 HX |
141 | static void esp_output_done(struct crypto_async_request *base, int err) |
142 | { | |
143 | struct sk_buff *skb = base->data; | |
03e2a30f SK |
144 | void *tmp; |
145 | struct dst_entry *dst = skb_dst(skb); | |
146 | struct xfrm_state *x = dst->xfrm; | |
38320c70 | 147 | |
03e2a30f SK |
148 | tmp = ESP_SKB_CB(skb)->tmp; |
149 | esp_ssg_unref(x, tmp); | |
150 | kfree(tmp); | |
38320c70 HX |
151 | xfrm_output_resume(skb, err); |
152 | } | |
153 | ||
000ae7b2 HX |
154 | /* Move ESP header back into place. */ |
155 | static void esp_restore_header(struct sk_buff *skb, unsigned int offset) | |
156 | { | |
157 | struct ip_esp_hdr *esph = (void *)(skb->data + offset); | |
158 | void *tmp = ESP_SKB_CB(skb)->tmp; | |
159 | __be32 *seqhi = esp_tmp_seqhi(tmp); | |
160 | ||
161 | esph->seq_no = esph->spi; | |
162 | esph->spi = *seqhi; | |
163 | } | |
164 | ||
165 | static void esp_output_restore_header(struct sk_buff *skb) | |
166 | { | |
167 | esp_restore_header(skb, skb_transport_offset(skb) - sizeof(__be32)); | |
168 | } | |
169 | ||
03e2a30f | 170 | static struct ip_esp_hdr *esp_output_set_esn(struct sk_buff *skb, |
383d0350 | 171 | struct xfrm_state *x, |
03e2a30f SK |
172 | struct ip_esp_hdr *esph, |
173 | __be32 *seqhi) | |
174 | { | |
03e2a30f SK |
175 | /* For ESN we move the header forward by 4 bytes to |
176 | * accomodate the high bits. We will move it back after | |
177 | * encryption. | |
178 | */ | |
179 | if ((x->props.flags & XFRM_STATE_ESN)) { | |
7862b405 SK |
180 | struct xfrm_offload *xo = xfrm_offload(skb); |
181 | ||
03e2a30f SK |
182 | esph = (void *)(skb_transport_header(skb) - sizeof(__be32)); |
183 | *seqhi = esph->spi; | |
7862b405 SK |
184 | if (xo) |
185 | esph->seq_no = htonl(xo->seq.hi); | |
186 | else | |
187 | esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.hi); | |
03e2a30f SK |
188 | } |
189 | ||
190 | esph->spi = x->id.spi; | |
191 | ||
192 | return esph; | |
193 | } | |
194 | ||
000ae7b2 HX |
195 | static void esp_output_done_esn(struct crypto_async_request *base, int err) |
196 | { | |
197 | struct sk_buff *skb = base->data; | |
198 | ||
199 | esp_output_restore_header(skb); | |
200 | esp_output_done(base, err); | |
201 | } | |
202 | ||
eb758c88 SK |
203 | static void esp_output_fill_trailer(u8 *tail, int tfclen, int plen, __u8 proto) |
204 | { | |
205 | /* Fill padding... */ | |
206 | if (tfclen) { | |
207 | memset(tail, 0, tfclen); | |
208 | tail += tfclen; | |
209 | } | |
210 | do { | |
211 | int i; | |
212 | for (i = 0; i < plen - 2; i++) | |
213 | tail[i] = i + 1; | |
214 | } while (0); | |
215 | tail[plen - 2] = plen - 2; | |
216 | tail[plen - 1] = proto; | |
217 | } | |
218 | ||
383d0350 | 219 | int esp6_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp) |
1da177e4 | 220 | { |
27a884dc | 221 | u8 *tail; |
03e2a30f | 222 | u8 *vaddr; |
383d0350 SK |
223 | int nfrags; |
224 | struct page *page; | |
383d0350 SK |
225 | struct sk_buff *trailer; |
226 | int tailen = esp->tailen; | |
d212a4c2 | 227 | |
03e2a30f SK |
228 | if (!skb_cloned(skb)) { |
229 | if (tailen <= skb_availroom(skb)) { | |
230 | nfrags = 1; | |
231 | trailer = skb; | |
232 | tail = skb_tail_pointer(trailer); | |
233 | ||
234 | goto skip_cow; | |
235 | } else if ((skb_shinfo(skb)->nr_frags < MAX_SKB_FRAGS) | |
236 | && !skb_has_frag_list(skb)) { | |
237 | int allocsize; | |
238 | struct sock *sk = skb->sk; | |
239 | struct page_frag *pfrag = &x->xfrag; | |
240 | ||
383d0350 SK |
241 | esp->inplace = false; |
242 | ||
03e2a30f SK |
243 | allocsize = ALIGN(tailen, L1_CACHE_BYTES); |
244 | ||
245 | spin_lock_bh(&x->lock); | |
246 | ||
247 | if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) { | |
248 | spin_unlock_bh(&x->lock); | |
249 | goto cow; | |
250 | } | |
251 | ||
252 | page = pfrag->page; | |
253 | get_page(page); | |
254 | ||
255 | vaddr = kmap_atomic(page); | |
256 | ||
257 | tail = vaddr + pfrag->offset; | |
258 | ||
383d0350 | 259 | esp_output_fill_trailer(tail, esp->tfclen, esp->plen, esp->proto); |
03e2a30f SK |
260 | |
261 | kunmap_atomic(vaddr); | |
262 | ||
383d0350 SK |
263 | spin_unlock_bh(&x->lock); |
264 | ||
03e2a30f SK |
265 | nfrags = skb_shinfo(skb)->nr_frags; |
266 | ||
267 | __skb_fill_page_desc(skb, nfrags, page, pfrag->offset, | |
268 | tailen); | |
269 | skb_shinfo(skb)->nr_frags = ++nfrags; | |
270 | ||
271 | pfrag->offset = pfrag->offset + allocsize; | |
272 | nfrags++; | |
273 | ||
274 | skb->len += tailen; | |
275 | skb->data_len += tailen; | |
276 | skb->truesize += tailen; | |
277 | if (sk) | |
14afee4b | 278 | refcount_add(tailen, &sk->sk_wmem_alloc); |
03e2a30f | 279 | |
383d0350 | 280 | goto out; |
03e2a30f | 281 | } |
48f125ce | 282 | } |
38320c70 | 283 | |
03e2a30f | 284 | cow: |
383d0350 SK |
285 | nfrags = skb_cow_data(skb, tailen, &trailer); |
286 | if (nfrags < 0) | |
287 | goto out; | |
27a884dc | 288 | tail = skb_tail_pointer(trailer); |
03e2a30f SK |
289 | |
290 | skip_cow: | |
383d0350 SK |
291 | esp_output_fill_trailer(tail, esp->tfclen, esp->plen, esp->proto); |
292 | pskb_put(skb, trailer, tailen); | |
1da177e4 | 293 | |
383d0350 SK |
294 | out: |
295 | return nfrags; | |
296 | } | |
297 | EXPORT_SYMBOL_GPL(esp6_output_head); | |
1da177e4 | 298 | |
383d0350 SK |
299 | int esp6_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp) |
300 | { | |
301 | u8 *iv; | |
302 | int alen; | |
303 | void *tmp; | |
304 | int ivlen; | |
305 | int assoclen; | |
306 | int seqhilen; | |
307 | __be32 *seqhi; | |
308 | struct page *page; | |
309 | struct ip_esp_hdr *esph; | |
310 | struct aead_request *req; | |
311 | struct crypto_aead *aead; | |
312 | struct scatterlist *sg, *dsg; | |
313 | int err = -ENOMEM; | |
314 | ||
315 | assoclen = sizeof(struct ip_esp_hdr); | |
316 | seqhilen = 0; | |
317 | ||
318 | if (x->props.flags & XFRM_STATE_ESN) { | |
319 | seqhilen += sizeof(__be32); | |
320 | assoclen += sizeof(__be32); | |
321 | } | |
1da177e4 | 322 | |
383d0350 SK |
323 | aead = x->data; |
324 | alen = crypto_aead_authsize(aead); | |
325 | ivlen = crypto_aead_ivsize(aead); | |
326 | ||
327 | tmp = esp_alloc_tmp(aead, esp->nfrags + 2, seqhilen); | |
e892d2d4 | 328 | if (!tmp) |
03e2a30f | 329 | goto error; |
000ae7b2 | 330 | |
03e2a30f SK |
331 | seqhi = esp_tmp_seqhi(tmp); |
332 | iv = esp_tmp_iv(aead, tmp, seqhilen); | |
333 | req = esp_tmp_req(aead, iv); | |
334 | sg = esp_req_sg(aead, req); | |
03e2a30f | 335 | |
383d0350 SK |
336 | if (esp->inplace) |
337 | dsg = sg; | |
338 | else | |
339 | dsg = &sg[esp->nfrags]; | |
340 | ||
341 | esph = esp_output_set_esn(skb, x, ip_esp_hdr(skb), seqhi); | |
000ae7b2 | 342 | |
383d0350 | 343 | sg_init_table(sg, esp->nfrags); |
3f297707 JD |
344 | err = skb_to_sgvec(skb, sg, |
345 | (unsigned char *)esph - skb->data, | |
346 | assoclen + ivlen + esp->clen + alen); | |
347 | if (unlikely(err < 0)) | |
348 | goto error; | |
383d0350 SK |
349 | |
350 | if (!esp->inplace) { | |
351 | int allocsize; | |
352 | struct page_frag *pfrag = &x->xfrag; | |
353 | ||
354 | allocsize = ALIGN(skb->data_len, L1_CACHE_BYTES); | |
355 | ||
356 | spin_lock_bh(&x->lock); | |
357 | if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) { | |
358 | spin_unlock_bh(&x->lock); | |
383d0350 SK |
359 | goto error; |
360 | } | |
361 | ||
362 | skb_shinfo(skb)->nr_frags = 1; | |
363 | ||
364 | page = pfrag->page; | |
365 | get_page(page); | |
366 | /* replace page frags in skb with new page */ | |
367 | __skb_fill_page_desc(skb, 0, page, pfrag->offset, skb->data_len); | |
368 | pfrag->offset = pfrag->offset + allocsize; | |
369 | spin_unlock_bh(&x->lock); | |
370 | ||
371 | sg_init_table(dsg, skb_shinfo(skb)->nr_frags + 1); | |
3f297707 JD |
372 | err = skb_to_sgvec(skb, dsg, |
373 | (unsigned char *)esph - skb->data, | |
374 | assoclen + ivlen + esp->clen + alen); | |
375 | if (unlikely(err < 0)) | |
376 | goto error; | |
383d0350 | 377 | } |
d212a4c2 | 378 | |
03e2a30f SK |
379 | if ((x->props.flags & XFRM_STATE_ESN)) |
380 | aead_request_set_callback(req, 0, esp_output_done_esn, skb); | |
381 | else | |
382 | aead_request_set_callback(req, 0, esp_output_done, skb); | |
383 | ||
383d0350 | 384 | aead_request_set_crypt(req, sg, dsg, ivlen + esp->clen, iv); |
000ae7b2 HX |
385 | aead_request_set_ad(req, assoclen); |
386 | ||
000ae7b2 | 387 | memset(iv, 0, ivlen); |
383d0350 | 388 | memcpy(iv + ivlen - min(ivlen, 8), (u8 *)&esp->seqno + 8 - min(ivlen, 8), |
000ae7b2 | 389 | min(ivlen, 8)); |
1da177e4 | 390 | |
38320c70 | 391 | ESP_SKB_CB(skb)->tmp = tmp; |
000ae7b2 HX |
392 | err = crypto_aead_encrypt(req); |
393 | ||
394 | switch (err) { | |
395 | case -EINPROGRESS: | |
38320c70 | 396 | goto error; |
1da177e4 | 397 | |
000ae7b2 | 398 | case -EBUSY: |
38320c70 | 399 | err = NET_XMIT_DROP; |
000ae7b2 HX |
400 | break; |
401 | ||
402 | case 0: | |
403 | if ((x->props.flags & XFRM_STATE_ESN)) | |
404 | esp_output_restore_header(skb); | |
405 | } | |
38320c70 | 406 | |
03e2a30f SK |
407 | if (sg != dsg) |
408 | esp_ssg_unref(x, tmp); | |
38320c70 HX |
409 | kfree(tmp); |
410 | ||
411 | error: | |
412 | return err; | |
413 | } | |
383d0350 SK |
414 | EXPORT_SYMBOL_GPL(esp6_output_tail); |
415 | ||
416 | static int esp6_output(struct xfrm_state *x, struct sk_buff *skb) | |
417 | { | |
418 | int alen; | |
419 | int blksize; | |
420 | struct ip_esp_hdr *esph; | |
421 | struct crypto_aead *aead; | |
422 | struct esp_info esp; | |
423 | ||
424 | esp.inplace = true; | |
425 | ||
426 | esp.proto = *skb_mac_header(skb); | |
427 | *skb_mac_header(skb) = IPPROTO_ESP; | |
428 | ||
429 | /* skb is pure payload to encrypt */ | |
430 | ||
431 | aead = x->data; | |
432 | alen = crypto_aead_authsize(aead); | |
433 | ||
434 | esp.tfclen = 0; | |
435 | if (x->tfcpad) { | |
436 | struct xfrm_dst *dst = (struct xfrm_dst *)skb_dst(skb); | |
437 | u32 padto; | |
438 | ||
439 | padto = min(x->tfcpad, esp6_get_mtu(x, dst->child_mtu_cached)); | |
440 | if (skb->len < padto) | |
441 | esp.tfclen = padto - skb->len; | |
442 | } | |
443 | blksize = ALIGN(crypto_aead_blocksize(aead), 4); | |
444 | esp.clen = ALIGN(skb->len + 2 + esp.tfclen, blksize); | |
445 | esp.plen = esp.clen - skb->len - esp.tfclen; | |
446 | esp.tailen = esp.tfclen + esp.plen + alen; | |
447 | ||
448 | esp.nfrags = esp6_output_head(x, skb, &esp); | |
449 | if (esp.nfrags < 0) | |
450 | return esp.nfrags; | |
451 | ||
452 | esph = ip_esp_hdr(skb); | |
453 | esph->spi = x->id.spi; | |
454 | ||
455 | esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low); | |
456 | esp.seqno = cpu_to_be64(XFRM_SKB_CB(skb)->seq.output.low + | |
457 | ((u64)XFRM_SKB_CB(skb)->seq.output.hi << 32)); | |
458 | ||
459 | skb_push(skb, -skb_network_offset(skb)); | |
460 | ||
461 | return esp6_output_tail(x, skb, &esp); | |
462 | } | |
38320c70 | 463 | |
383d0350 | 464 | int esp6_input_done2(struct sk_buff *skb, int err) |
38320c70 HX |
465 | { |
466 | struct xfrm_state *x = xfrm_input_state(skb); | |
d77e38e6 | 467 | struct xfrm_offload *xo = xfrm_offload(skb); |
1c5ad13f | 468 | struct crypto_aead *aead = x->data; |
38320c70 HX |
469 | int alen = crypto_aead_authsize(aead); |
470 | int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead); | |
471 | int elen = skb->len - hlen; | |
472 | int hdr_len = skb_network_header_len(skb); | |
473 | int padlen; | |
474 | u8 nexthdr[2]; | |
475 | ||
d77e38e6 SK |
476 | if (!xo || (xo && !(xo->flags & CRYPTO_DONE))) |
477 | kfree(ESP_SKB_CB(skb)->tmp); | |
1da177e4 | 478 | |
6b7326c8 | 479 | if (unlikely(err)) |
38320c70 | 480 | goto out; |
6b7326c8 | 481 | |
38320c70 HX |
482 | if (skb_copy_bits(skb, skb->len - alen - 2, nexthdr, 2)) |
483 | BUG(); | |
1da177e4 | 484 | |
38320c70 HX |
485 | err = -EINVAL; |
486 | padlen = nexthdr[0]; | |
487 | if (padlen + 2 + alen >= elen) { | |
ba7a46f1 JP |
488 | net_dbg_ratelimited("ipsec esp packet is garbage padlen=%d, elen=%d\n", |
489 | padlen + 2, elen - alen); | |
38320c70 | 490 | goto out; |
1da177e4 LT |
491 | } |
492 | ||
38320c70 | 493 | /* ... check padding bits here. Silly. :-) */ |
b7c6538c | 494 | |
38320c70 HX |
495 | pskb_trim(skb, skb->len - alen - padlen - 2); |
496 | __skb_pull(skb, hlen); | |
a9403f8a LR |
497 | if (x->props.mode == XFRM_MODE_TUNNEL) |
498 | skb_reset_transport_header(skb); | |
499 | else | |
500 | skb_set_transport_header(skb, -hdr_len); | |
38320c70 HX |
501 | |
502 | err = nexthdr[1]; | |
503 | ||
504 | /* RFC4303: Drop dummy packets without any error */ | |
505 | if (err == IPPROTO_NONE) | |
506 | err = -EINVAL; | |
507 | ||
508 | out: | |
1da177e4 LT |
509 | return err; |
510 | } | |
383d0350 | 511 | EXPORT_SYMBOL_GPL(esp6_input_done2); |
1da177e4 | 512 | |
38320c70 HX |
513 | static void esp_input_done(struct crypto_async_request *base, int err) |
514 | { | |
515 | struct sk_buff *skb = base->data; | |
516 | ||
f1fbed0e | 517 | xfrm_input_resume(skb, esp6_input_done2(skb, err)); |
38320c70 HX |
518 | } |
519 | ||
000ae7b2 HX |
520 | static void esp_input_restore_header(struct sk_buff *skb) |
521 | { | |
522 | esp_restore_header(skb, 0); | |
523 | __skb_pull(skb, 4); | |
524 | } | |
525 | ||
03e2a30f SK |
526 | static void esp_input_set_header(struct sk_buff *skb, __be32 *seqhi) |
527 | { | |
528 | struct xfrm_state *x = xfrm_input_state(skb); | |
529 | struct ip_esp_hdr *esph = (struct ip_esp_hdr *)skb->data; | |
530 | ||
531 | /* For ESN we move the header forward by 4 bytes to | |
532 | * accomodate the high bits. We will move it back after | |
533 | * decryption. | |
534 | */ | |
535 | if ((x->props.flags & XFRM_STATE_ESN)) { | |
d58ff351 | 536 | esph = skb_push(skb, 4); |
03e2a30f SK |
537 | *seqhi = esph->spi; |
538 | esph->spi = esph->seq_no; | |
539 | esph->seq_no = XFRM_SKB_CB(skb)->seq.input.hi; | |
540 | } | |
541 | } | |
542 | ||
000ae7b2 HX |
543 | static void esp_input_done_esn(struct crypto_async_request *base, int err) |
544 | { | |
545 | struct sk_buff *skb = base->data; | |
546 | ||
547 | esp_input_restore_header(skb); | |
548 | esp_input_done(base, err); | |
549 | } | |
550 | ||
e695633e | 551 | static int esp6_input(struct xfrm_state *x, struct sk_buff *skb) |
1da177e4 | 552 | { |
87bdc48d | 553 | struct ip_esp_hdr *esph; |
1c5ad13f | 554 | struct crypto_aead *aead = x->data; |
38320c70 | 555 | struct aead_request *req; |
1da177e4 | 556 | struct sk_buff *trailer; |
000ae7b2 HX |
557 | int ivlen = crypto_aead_ivsize(aead); |
558 | int elen = skb->len - sizeof(*esph) - ivlen; | |
1da177e4 | 559 | int nfrags; |
d212a4c2 | 560 | int assoclen; |
d212a4c2 | 561 | int seqhilen; |
1da177e4 | 562 | int ret = 0; |
38320c70 | 563 | void *tmp; |
d212a4c2 | 564 | __be32 *seqhi; |
38320c70 HX |
565 | u8 *iv; |
566 | struct scatterlist *sg; | |
1da177e4 | 567 | |
000ae7b2 | 568 | if (!pskb_may_pull(skb, sizeof(*esph) + ivlen)) { |
1da177e4 | 569 | ret = -EINVAL; |
31a4ab93 | 570 | goto out; |
1da177e4 LT |
571 | } |
572 | ||
38320c70 | 573 | if (elen <= 0) { |
1da177e4 | 574 | ret = -EINVAL; |
31a4ab93 | 575 | goto out; |
1da177e4 | 576 | } |
1da177e4 | 577 | |
d212a4c2 | 578 | assoclen = sizeof(*esph); |
d212a4c2 SK |
579 | seqhilen = 0; |
580 | ||
581 | if (x->props.flags & XFRM_STATE_ESN) { | |
d212a4c2 SK |
582 | seqhilen += sizeof(__be32); |
583 | assoclen += seqhilen; | |
584 | } | |
585 | ||
03e2a30f SK |
586 | if (!skb_cloned(skb)) { |
587 | if (!skb_is_nonlinear(skb)) { | |
588 | nfrags = 1; | |
589 | ||
590 | goto skip_cow; | |
591 | } else if (!skb_has_frag_list(skb)) { | |
592 | nfrags = skb_shinfo(skb)->nr_frags; | |
593 | nfrags++; | |
594 | ||
595 | goto skip_cow; | |
596 | } | |
597 | } | |
598 | ||
599 | nfrags = skb_cow_data(skb, 0, &trailer); | |
600 | if (nfrags < 0) { | |
601 | ret = -EINVAL; | |
602 | goto out; | |
603 | } | |
604 | ||
605 | skip_cow: | |
606 | ret = -ENOMEM; | |
000ae7b2 | 607 | tmp = esp_alloc_tmp(aead, nfrags, seqhilen); |
38320c70 HX |
608 | if (!tmp) |
609 | goto out; | |
1da177e4 | 610 | |
38320c70 | 611 | ESP_SKB_CB(skb)->tmp = tmp; |
d212a4c2 SK |
612 | seqhi = esp_tmp_seqhi(tmp); |
613 | iv = esp_tmp_iv(aead, tmp, seqhilen); | |
38320c70 | 614 | req = esp_tmp_req(aead, iv); |
000ae7b2 | 615 | sg = esp_req_sg(aead, req); |
1da177e4 | 616 | |
03e2a30f | 617 | esp_input_set_header(skb, seqhi); |
1da177e4 | 618 | |
03e2a30f | 619 | sg_init_table(sg, nfrags); |
3f297707 JD |
620 | ret = skb_to_sgvec(skb, sg, 0, skb->len); |
621 | if (unlikely(ret < 0)) | |
622 | goto out; | |
1da177e4 | 623 | |
03e2a30f | 624 | skb->ip_summed = CHECKSUM_NONE; |
d212a4c2 | 625 | |
03e2a30f | 626 | if ((x->props.flags & XFRM_STATE_ESN)) |
000ae7b2 | 627 | aead_request_set_callback(req, 0, esp_input_done_esn, skb); |
03e2a30f SK |
628 | else |
629 | aead_request_set_callback(req, 0, esp_input_done, skb); | |
000ae7b2 HX |
630 | |
631 | aead_request_set_crypt(req, sg, sg, elen + ivlen, iv); | |
632 | aead_request_set_ad(req, assoclen); | |
1da177e4 | 633 | |
38320c70 HX |
634 | ret = crypto_aead_decrypt(req); |
635 | if (ret == -EINPROGRESS) | |
636 | goto out; | |
95a02cfd | 637 | |
000ae7b2 HX |
638 | if ((x->props.flags & XFRM_STATE_ESN)) |
639 | esp_input_restore_header(skb); | |
640 | ||
f1fbed0e | 641 | ret = esp6_input_done2(skb, ret); |
1da177e4 LT |
642 | |
643 | out: | |
1da177e4 LT |
644 | return ret; |
645 | } | |
646 | ||
c5c25238 | 647 | static u32 esp6_get_mtu(struct xfrm_state *x, int mtu) |
1da177e4 | 648 | { |
1c5ad13f MK |
649 | struct crypto_aead *aead = x->data; |
650 | u32 blksize = ALIGN(crypto_aead_blocksize(aead), 4); | |
91657eaf | 651 | unsigned int net_adj; |
1da177e4 | 652 | |
91657eaf BP |
653 | if (x->props.mode != XFRM_MODE_TUNNEL) |
654 | net_adj = sizeof(struct ipv6hdr); | |
655 | else | |
656 | net_adj = 0; | |
c5c25238 | 657 | |
1c5ad13f | 658 | return ((mtu - x->props.header_len - crypto_aead_authsize(aead) - |
123b0d1b | 659 | net_adj) & ~(blksize - 1)) + net_adj - 2; |
1da177e4 LT |
660 | } |
661 | ||
d5860c5c SK |
662 | static int esp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
663 | u8 type, u8 code, int offset, __be32 info) | |
1da177e4 | 664 | { |
4fb236ba | 665 | struct net *net = dev_net(skb->dev); |
b71d1d42 | 666 | const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data; |
87bdc48d | 667 | struct ip_esp_hdr *esph = (struct ip_esp_hdr *)(skb->data + offset); |
1da177e4 LT |
668 | struct xfrm_state *x; |
669 | ||
b3b2b9e1 | 670 | if (type != ICMPV6_PKT_TOOBIG && |
ec18d9a2 | 671 | type != NDISC_REDIRECT) |
d5860c5c | 672 | return 0; |
1da177e4 | 673 | |
b71d1d42 ED |
674 | x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr, |
675 | esph->spi, IPPROTO_ESP, AF_INET6); | |
1da177e4 | 676 | if (!x) |
d5860c5c | 677 | return 0; |
ec18d9a2 DM |
678 | |
679 | if (type == NDISC_REDIRECT) | |
e2d118a1 LC |
680 | ip6_redirect(skb, net, skb->dev->ifindex, 0, |
681 | sock_net_uid(net, NULL)); | |
ec18d9a2 | 682 | else |
e2d118a1 | 683 | ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); |
1da177e4 | 684 | xfrm_state_put(x); |
d5860c5c SK |
685 | |
686 | return 0; | |
1da177e4 LT |
687 | } |
688 | ||
689 | static void esp6_destroy(struct xfrm_state *x) | |
690 | { | |
1c5ad13f | 691 | struct crypto_aead *aead = x->data; |
1da177e4 | 692 | |
1c5ad13f | 693 | if (!aead) |
1da177e4 LT |
694 | return; |
695 | ||
1c5ad13f | 696 | crypto_free_aead(aead); |
1da177e4 LT |
697 | } |
698 | ||
1a6509d9 HX |
699 | static int esp_init_aead(struct xfrm_state *x) |
700 | { | |
000ae7b2 | 701 | char aead_name[CRYPTO_MAX_ALG_NAME]; |
1a6509d9 HX |
702 | struct crypto_aead *aead; |
703 | int err; | |
b3859c8e | 704 | u32 mask = 0; |
1a6509d9 | 705 | |
000ae7b2 HX |
706 | err = -ENAMETOOLONG; |
707 | if (snprintf(aead_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", | |
708 | x->geniv, x->aead->alg_name) >= CRYPTO_MAX_ALG_NAME) | |
709 | goto error; | |
710 | ||
b3859c8e SK |
711 | if (x->xso.offload_handle) |
712 | mask |= CRYPTO_ALG_ASYNC; | |
713 | ||
714 | aead = crypto_alloc_aead(aead_name, 0, mask); | |
1a6509d9 HX |
715 | err = PTR_ERR(aead); |
716 | if (IS_ERR(aead)) | |
717 | goto error; | |
718 | ||
1c5ad13f | 719 | x->data = aead; |
1a6509d9 HX |
720 | |
721 | err = crypto_aead_setkey(aead, x->aead->alg_key, | |
722 | (x->aead->alg_key_len + 7) / 8); | |
723 | if (err) | |
724 | goto error; | |
725 | ||
726 | err = crypto_aead_setauthsize(aead, x->aead->alg_icv_len / 8); | |
727 | if (err) | |
728 | goto error; | |
729 | ||
730 | error: | |
731 | return err; | |
732 | } | |
733 | ||
734 | static int esp_init_authenc(struct xfrm_state *x) | |
1da177e4 | 735 | { |
38320c70 HX |
736 | struct crypto_aead *aead; |
737 | struct crypto_authenc_key_param *param; | |
738 | struct rtattr *rta; | |
739 | char *key; | |
740 | char *p; | |
741 | char authenc_name[CRYPTO_MAX_ALG_NAME]; | |
38320c70 HX |
742 | unsigned int keylen; |
743 | int err; | |
b3859c8e | 744 | u32 mask = 0; |
1da177e4 | 745 | |
1a6509d9 | 746 | err = -EINVAL; |
63159f29 | 747 | if (!x->ealg) |
1a6509d9 | 748 | goto error; |
38320c70 | 749 | |
1a6509d9 | 750 | err = -ENAMETOOLONG; |
d212a4c2 SK |
751 | |
752 | if ((x->props.flags & XFRM_STATE_ESN)) { | |
753 | if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME, | |
000ae7b2 HX |
754 | "%s%sauthencesn(%s,%s)%s", |
755 | x->geniv ?: "", x->geniv ? "(" : "", | |
d212a4c2 | 756 | x->aalg ? x->aalg->alg_name : "digest_null", |
000ae7b2 HX |
757 | x->ealg->alg_name, |
758 | x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME) | |
d212a4c2 SK |
759 | goto error; |
760 | } else { | |
761 | if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME, | |
000ae7b2 HX |
762 | "%s%sauthenc(%s,%s)%s", |
763 | x->geniv ?: "", x->geniv ? "(" : "", | |
d212a4c2 | 764 | x->aalg ? x->aalg->alg_name : "digest_null", |
000ae7b2 HX |
765 | x->ealg->alg_name, |
766 | x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME) | |
d212a4c2 SK |
767 | goto error; |
768 | } | |
38320c70 | 769 | |
b3859c8e SK |
770 | if (x->xso.offload_handle) |
771 | mask |= CRYPTO_ALG_ASYNC; | |
772 | ||
773 | aead = crypto_alloc_aead(authenc_name, 0, mask); | |
38320c70 HX |
774 | err = PTR_ERR(aead); |
775 | if (IS_ERR(aead)) | |
776 | goto error; | |
777 | ||
1c5ad13f | 778 | x->data = aead; |
38320c70 HX |
779 | |
780 | keylen = (x->aalg ? (x->aalg->alg_key_len + 7) / 8 : 0) + | |
781 | (x->ealg->alg_key_len + 7) / 8 + RTA_SPACE(sizeof(*param)); | |
782 | err = -ENOMEM; | |
783 | key = kmalloc(keylen, GFP_KERNEL); | |
784 | if (!key) | |
785 | goto error; | |
786 | ||
787 | p = key; | |
788 | rta = (void *)p; | |
789 | rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM; | |
790 | rta->rta_len = RTA_LENGTH(sizeof(*param)); | |
791 | param = RTA_DATA(rta); | |
792 | p += RTA_SPACE(sizeof(*param)); | |
793 | ||
1da177e4 LT |
794 | if (x->aalg) { |
795 | struct xfrm_algo_desc *aalg_desc; | |
796 | ||
38320c70 HX |
797 | memcpy(p, x->aalg->alg_key, (x->aalg->alg_key_len + 7) / 8); |
798 | p += (x->aalg->alg_key_len + 7) / 8; | |
1ab1457c | 799 | |
1da177e4 LT |
800 | aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0); |
801 | BUG_ON(!aalg_desc); | |
1ab1457c | 802 | |
38320c70 | 803 | err = -EINVAL; |
45083497 | 804 | if (aalg_desc->uinfo.auth.icv_fullbits / 8 != |
38320c70 | 805 | crypto_aead_authsize(aead)) { |
45083497 JP |
806 | pr_info("ESP: %s digestsize %u != %hu\n", |
807 | x->aalg->alg_name, | |
808 | crypto_aead_authsize(aead), | |
809 | aalg_desc->uinfo.auth.icv_fullbits / 8); | |
38320c70 | 810 | goto free_key; |
1da177e4 | 811 | } |
1ab1457c | 812 | |
38320c70 | 813 | err = crypto_aead_setauthsize( |
8f8a088c | 814 | aead, x->aalg->alg_trunc_len / 8); |
38320c70 HX |
815 | if (err) |
816 | goto free_key; | |
1da177e4 | 817 | } |
38320c70 | 818 | |
38320c70 HX |
819 | param->enckeylen = cpu_to_be32((x->ealg->alg_key_len + 7) / 8); |
820 | memcpy(p, x->ealg->alg_key, (x->ealg->alg_key_len + 7) / 8); | |
821 | ||
822 | err = crypto_aead_setkey(aead, key, keylen); | |
823 | ||
824 | free_key: | |
825 | kfree(key); | |
826 | ||
1a6509d9 HX |
827 | error: |
828 | return err; | |
829 | } | |
830 | ||
831 | static int esp6_init_state(struct xfrm_state *x) | |
832 | { | |
1a6509d9 HX |
833 | struct crypto_aead *aead; |
834 | u32 align; | |
835 | int err; | |
836 | ||
837 | if (x->encap) | |
838 | return -EINVAL; | |
839 | ||
1c5ad13f | 840 | x->data = NULL; |
1a6509d9 HX |
841 | |
842 | if (x->aead) | |
843 | err = esp_init_aead(x); | |
844 | else | |
845 | err = esp_init_authenc(x); | |
846 | ||
38320c70 | 847 | if (err) |
1da177e4 | 848 | goto error; |
38320c70 | 849 | |
1c5ad13f | 850 | aead = x->data; |
1a6509d9 | 851 | |
38320c70 HX |
852 | x->props.header_len = sizeof(struct ip_esp_hdr) + |
853 | crypto_aead_ivsize(aead); | |
ca68145f HX |
854 | switch (x->props.mode) { |
855 | case XFRM_MODE_BEET: | |
abf5cdb8 JK |
856 | if (x->sel.family != AF_INET6) |
857 | x->props.header_len += IPV4_BEET_PHMAXLEN + | |
67ba4152 | 858 | (sizeof(struct ipv6hdr) - sizeof(struct iphdr)); |
abf5cdb8 | 859 | break; |
ca68145f HX |
860 | case XFRM_MODE_TRANSPORT: |
861 | break; | |
862 | case XFRM_MODE_TUNNEL: | |
1da177e4 | 863 | x->props.header_len += sizeof(struct ipv6hdr); |
ea2c47b4 | 864 | break; |
ca68145f HX |
865 | default: |
866 | goto error; | |
867 | } | |
38320c70 HX |
868 | |
869 | align = ALIGN(crypto_aead_blocksize(aead), 4); | |
1c5ad13f | 870 | x->props.trailer_len = align + 1 + crypto_aead_authsize(aead); |
1da177e4 LT |
871 | |
872 | error: | |
38320c70 | 873 | return err; |
1da177e4 LT |
874 | } |
875 | ||
d5860c5c SK |
876 | static int esp6_rcv_cb(struct sk_buff *skb, int err) |
877 | { | |
878 | return 0; | |
879 | } | |
880 | ||
cc24beca | 881 | static const struct xfrm_type esp6_type = { |
1da177e4 | 882 | .description = "ESP6", |
cc24beca IM |
883 | .owner = THIS_MODULE, |
884 | .proto = IPPROTO_ESP, | |
436a0a40 | 885 | .flags = XFRM_TYPE_REPLAY_PROT, |
1da177e4 LT |
886 | .init_state = esp6_init_state, |
887 | .destructor = esp6_destroy, | |
c5c25238 | 888 | .get_mtu = esp6_get_mtu, |
1da177e4 | 889 | .input = esp6_input, |
aee5adb4 MN |
890 | .output = esp6_output, |
891 | .hdr_offset = xfrm6_find_1stfragopt, | |
1da177e4 LT |
892 | }; |
893 | ||
d5860c5c SK |
894 | static struct xfrm6_protocol esp6_protocol = { |
895 | .handler = xfrm6_rcv, | |
896 | .cb_handler = esp6_rcv_cb, | |
1da177e4 | 897 | .err_handler = esp6_err, |
d5860c5c | 898 | .priority = 0, |
1da177e4 LT |
899 | }; |
900 | ||
901 | static int __init esp6_init(void) | |
902 | { | |
903 | if (xfrm_register_type(&esp6_type, AF_INET6) < 0) { | |
f3213831 | 904 | pr_info("%s: can't add xfrm type\n", __func__); |
1da177e4 LT |
905 | return -EAGAIN; |
906 | } | |
d5860c5c | 907 | if (xfrm6_protocol_register(&esp6_protocol, IPPROTO_ESP) < 0) { |
f3213831 | 908 | pr_info("%s: can't add protocol\n", __func__); |
1da177e4 LT |
909 | xfrm_unregister_type(&esp6_type, AF_INET6); |
910 | return -EAGAIN; | |
911 | } | |
912 | ||
913 | return 0; | |
914 | } | |
915 | ||
916 | static void __exit esp6_fini(void) | |
917 | { | |
d5860c5c | 918 | if (xfrm6_protocol_deregister(&esp6_protocol, IPPROTO_ESP) < 0) |
f3213831 | 919 | pr_info("%s: can't remove protocol\n", __func__); |
1da177e4 | 920 | if (xfrm_unregister_type(&esp6_type, AF_INET6) < 0) |
f3213831 | 921 | pr_info("%s: can't remove xfrm type\n", __func__); |
1da177e4 LT |
922 | } |
923 | ||
924 | module_init(esp6_init); | |
925 | module_exit(esp6_fini); | |
926 | ||
927 | MODULE_LICENSE("GPL"); | |
d3d6dd3a | 928 | MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_ESP); |