Commit | Line | Data |
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1ccea77e | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * Copyright (C)2002 USAGI/WIDE Project | |
1ab1457c | 4 | * |
1da177e4 LT |
5 | * Authors |
6 | * | |
1ab1457c | 7 | * Mitsuru KANDA @USAGI : IPv6 Support |
67ba4152 IM |
8 | * Kazunori MIYAZAWA @USAGI : |
9 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> | |
1ab1457c | 10 | * |
67ba4152 | 11 | * This file is derived from net/ipv4/esp.c |
1da177e4 LT |
12 | */ |
13 | ||
f3213831 JP |
14 | #define pr_fmt(fmt) "IPv6: " fmt |
15 | ||
38320c70 HX |
16 | #include <crypto/aead.h> |
17 | #include <crypto/authenc.h> | |
6b7326c8 | 18 | #include <linux/err.h> |
1da177e4 LT |
19 | #include <linux/module.h> |
20 | #include <net/ip.h> | |
21 | #include <net/xfrm.h> | |
22 | #include <net/esp.h> | |
72998d8c | 23 | #include <linux/scatterlist.h> |
a02a6422 | 24 | #include <linux/kernel.h> |
1da177e4 LT |
25 | #include <linux/pfkeyv2.h> |
26 | #include <linux/random.h> | |
38320c70 | 27 | #include <linux/slab.h> |
b7c6538c | 28 | #include <linux/spinlock.h> |
81aded24 | 29 | #include <net/ip6_route.h> |
1da177e4 LT |
30 | #include <net/icmp.h> |
31 | #include <net/ipv6.h> | |
14c85021 | 32 | #include <net/protocol.h> |
1da177e4 LT |
33 | #include <linux/icmpv6.h> |
34 | ||
03e2a30f SK |
35 | #include <linux/highmem.h> |
36 | ||
38320c70 HX |
37 | struct esp_skb_cb { |
38 | struct xfrm_skb_cb xfrm; | |
39 | void *tmp; | |
40 | }; | |
41 | ||
42 | #define ESP_SKB_CB(__skb) ((struct esp_skb_cb *)&((__skb)->cb[0])) | |
43 | ||
44 | /* | |
45 | * Allocate an AEAD request structure with extra space for SG and IV. | |
46 | * | |
d212a4c2 SK |
47 | * For alignment considerations the upper 32 bits of the sequence number are |
48 | * placed at the front, if present. Followed by the IV, the request and finally | |
49 | * the SG list. | |
38320c70 HX |
50 | * |
51 | * TODO: Use spare space in skb for this where possible. | |
52 | */ | |
d212a4c2 | 53 | static void *esp_alloc_tmp(struct crypto_aead *aead, int nfrags, int seqihlen) |
38320c70 HX |
54 | { |
55 | unsigned int len; | |
56 | ||
d212a4c2 SK |
57 | len = seqihlen; |
58 | ||
59 | len += crypto_aead_ivsize(aead); | |
60 | ||
38320c70 HX |
61 | if (len) { |
62 | len += crypto_aead_alignmask(aead) & | |
63 | ~(crypto_tfm_ctx_alignment() - 1); | |
64 | len = ALIGN(len, crypto_tfm_ctx_alignment()); | |
65 | } | |
66 | ||
000ae7b2 | 67 | len += sizeof(struct aead_request) + crypto_aead_reqsize(aead); |
38320c70 HX |
68 | len = ALIGN(len, __alignof__(struct scatterlist)); |
69 | ||
70 | len += sizeof(struct scatterlist) * nfrags; | |
71 | ||
72 | return kmalloc(len, GFP_ATOMIC); | |
73 | } | |
74 | ||
d212a4c2 SK |
75 | static inline __be32 *esp_tmp_seqhi(void *tmp) |
76 | { | |
77 | return PTR_ALIGN((__be32 *)tmp, __alignof__(__be32)); | |
78 | } | |
79 | ||
80 | static inline u8 *esp_tmp_iv(struct crypto_aead *aead, void *tmp, int seqhilen) | |
38320c70 HX |
81 | { |
82 | return crypto_aead_ivsize(aead) ? | |
d212a4c2 SK |
83 | PTR_ALIGN((u8 *)tmp + seqhilen, |
84 | crypto_aead_alignmask(aead) + 1) : tmp + seqhilen; | |
38320c70 HX |
85 | } |
86 | ||
38320c70 HX |
87 | static inline struct aead_request *esp_tmp_req(struct crypto_aead *aead, u8 *iv) |
88 | { | |
89 | struct aead_request *req; | |
90 | ||
91 | req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead), | |
92 | crypto_tfm_ctx_alignment()); | |
93 | aead_request_set_tfm(req, aead); | |
94 | return req; | |
95 | } | |
96 | ||
97 | static inline struct scatterlist *esp_req_sg(struct crypto_aead *aead, | |
98 | struct aead_request *req) | |
99 | { | |
100 | return (void *)ALIGN((unsigned long)(req + 1) + | |
101 | crypto_aead_reqsize(aead), | |
102 | __alignof__(struct scatterlist)); | |
103 | } | |
104 | ||
03e2a30f SK |
105 | static void esp_ssg_unref(struct xfrm_state *x, void *tmp) |
106 | { | |
03e2a30f SK |
107 | struct crypto_aead *aead = x->data; |
108 | int seqhilen = 0; | |
109 | u8 *iv; | |
110 | struct aead_request *req; | |
111 | struct scatterlist *sg; | |
112 | ||
113 | if (x->props.flags & XFRM_STATE_ESN) | |
114 | seqhilen += sizeof(__be32); | |
115 | ||
03e2a30f SK |
116 | iv = esp_tmp_iv(aead, tmp, seqhilen); |
117 | req = esp_tmp_req(aead, iv); | |
118 | ||
119 | /* Unref skb_frag_pages in the src scatterlist if necessary. | |
120 | * Skip the first sg which comes from skb->data. | |
121 | */ | |
122 | if (req->src != req->dst) | |
123 | for (sg = sg_next(req->src); sg; sg = sg_next(sg)) | |
124 | put_page(sg_page(sg)); | |
125 | } | |
126 | ||
38320c70 HX |
127 | static void esp_output_done(struct crypto_async_request *base, int err) |
128 | { | |
129 | struct sk_buff *skb = base->data; | |
f53c7239 | 130 | struct xfrm_offload *xo = xfrm_offload(skb); |
03e2a30f | 131 | void *tmp; |
f53c7239 SK |
132 | struct xfrm_state *x; |
133 | ||
2294be0f FW |
134 | if (xo && (xo->flags & XFRM_DEV_RESUME)) { |
135 | struct sec_path *sp = skb_sec_path(skb); | |
136 | ||
137 | x = sp->xvec[sp->len - 1]; | |
138 | } else { | |
f53c7239 | 139 | x = skb_dst(skb)->xfrm; |
2294be0f | 140 | } |
38320c70 | 141 | |
03e2a30f SK |
142 | tmp = ESP_SKB_CB(skb)->tmp; |
143 | esp_ssg_unref(x, tmp); | |
144 | kfree(tmp); | |
f53c7239 SK |
145 | |
146 | if (xo && (xo->flags & XFRM_DEV_RESUME)) { | |
147 | if (err) { | |
148 | XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTSTATEPROTOERROR); | |
149 | kfree_skb(skb); | |
150 | return; | |
151 | } | |
152 | ||
153 | skb_push(skb, skb->data - skb_mac_header(skb)); | |
154 | secpath_reset(skb); | |
155 | xfrm_dev_resume(skb); | |
156 | } else { | |
157 | xfrm_output_resume(skb, err); | |
158 | } | |
38320c70 HX |
159 | } |
160 | ||
000ae7b2 HX |
161 | /* Move ESP header back into place. */ |
162 | static void esp_restore_header(struct sk_buff *skb, unsigned int offset) | |
163 | { | |
164 | struct ip_esp_hdr *esph = (void *)(skb->data + offset); | |
165 | void *tmp = ESP_SKB_CB(skb)->tmp; | |
166 | __be32 *seqhi = esp_tmp_seqhi(tmp); | |
167 | ||
168 | esph->seq_no = esph->spi; | |
169 | esph->spi = *seqhi; | |
170 | } | |
171 | ||
172 | static void esp_output_restore_header(struct sk_buff *skb) | |
173 | { | |
174 | esp_restore_header(skb, skb_transport_offset(skb) - sizeof(__be32)); | |
175 | } | |
176 | ||
03e2a30f | 177 | static struct ip_esp_hdr *esp_output_set_esn(struct sk_buff *skb, |
383d0350 | 178 | struct xfrm_state *x, |
03e2a30f SK |
179 | struct ip_esp_hdr *esph, |
180 | __be32 *seqhi) | |
181 | { | |
03e2a30f SK |
182 | /* For ESN we move the header forward by 4 bytes to |
183 | * accomodate the high bits. We will move it back after | |
184 | * encryption. | |
185 | */ | |
186 | if ((x->props.flags & XFRM_STATE_ESN)) { | |
7862b405 SK |
187 | struct xfrm_offload *xo = xfrm_offload(skb); |
188 | ||
03e2a30f SK |
189 | esph = (void *)(skb_transport_header(skb) - sizeof(__be32)); |
190 | *seqhi = esph->spi; | |
7862b405 SK |
191 | if (xo) |
192 | esph->seq_no = htonl(xo->seq.hi); | |
193 | else | |
194 | esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.hi); | |
03e2a30f SK |
195 | } |
196 | ||
197 | esph->spi = x->id.spi; | |
198 | ||
199 | return esph; | |
200 | } | |
201 | ||
000ae7b2 HX |
202 | static void esp_output_done_esn(struct crypto_async_request *base, int err) |
203 | { | |
204 | struct sk_buff *skb = base->data; | |
205 | ||
206 | esp_output_restore_header(skb); | |
207 | esp_output_done(base, err); | |
208 | } | |
209 | ||
383d0350 | 210 | int esp6_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp) |
1da177e4 | 211 | { |
27a884dc | 212 | u8 *tail; |
03e2a30f | 213 | u8 *vaddr; |
383d0350 SK |
214 | int nfrags; |
215 | struct page *page; | |
383d0350 SK |
216 | struct sk_buff *trailer; |
217 | int tailen = esp->tailen; | |
d212a4c2 | 218 | |
03e2a30f | 219 | if (!skb_cloned(skb)) { |
54ffd790 | 220 | if (tailen <= skb_tailroom(skb)) { |
03e2a30f SK |
221 | nfrags = 1; |
222 | trailer = skb; | |
223 | tail = skb_tail_pointer(trailer); | |
224 | ||
225 | goto skip_cow; | |
226 | } else if ((skb_shinfo(skb)->nr_frags < MAX_SKB_FRAGS) | |
227 | && !skb_has_frag_list(skb)) { | |
228 | int allocsize; | |
229 | struct sock *sk = skb->sk; | |
230 | struct page_frag *pfrag = &x->xfrag; | |
231 | ||
383d0350 SK |
232 | esp->inplace = false; |
233 | ||
03e2a30f SK |
234 | allocsize = ALIGN(tailen, L1_CACHE_BYTES); |
235 | ||
236 | spin_lock_bh(&x->lock); | |
237 | ||
238 | if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) { | |
239 | spin_unlock_bh(&x->lock); | |
240 | goto cow; | |
241 | } | |
242 | ||
243 | page = pfrag->page; | |
244 | get_page(page); | |
245 | ||
246 | vaddr = kmap_atomic(page); | |
247 | ||
248 | tail = vaddr + pfrag->offset; | |
249 | ||
383d0350 | 250 | esp_output_fill_trailer(tail, esp->tfclen, esp->plen, esp->proto); |
03e2a30f SK |
251 | |
252 | kunmap_atomic(vaddr); | |
253 | ||
254 | nfrags = skb_shinfo(skb)->nr_frags; | |
255 | ||
256 | __skb_fill_page_desc(skb, nfrags, page, pfrag->offset, | |
257 | tailen); | |
258 | skb_shinfo(skb)->nr_frags = ++nfrags; | |
259 | ||
260 | pfrag->offset = pfrag->offset + allocsize; | |
36ff0dd3 SK |
261 | |
262 | spin_unlock_bh(&x->lock); | |
263 | ||
03e2a30f SK |
264 | nfrags++; |
265 | ||
266 | skb->len += tailen; | |
267 | skb->data_len += tailen; | |
268 | skb->truesize += tailen; | |
09db5124 | 269 | if (sk && sk_fullsock(sk)) |
14afee4b | 270 | refcount_add(tailen, &sk->sk_wmem_alloc); |
03e2a30f | 271 | |
383d0350 | 272 | goto out; |
03e2a30f | 273 | } |
48f125ce | 274 | } |
38320c70 | 275 | |
03e2a30f | 276 | cow: |
383d0350 SK |
277 | nfrags = skb_cow_data(skb, tailen, &trailer); |
278 | if (nfrags < 0) | |
279 | goto out; | |
27a884dc | 280 | tail = skb_tail_pointer(trailer); |
03e2a30f SK |
281 | |
282 | skip_cow: | |
383d0350 SK |
283 | esp_output_fill_trailer(tail, esp->tfclen, esp->plen, esp->proto); |
284 | pskb_put(skb, trailer, tailen); | |
1da177e4 | 285 | |
383d0350 SK |
286 | out: |
287 | return nfrags; | |
288 | } | |
289 | EXPORT_SYMBOL_GPL(esp6_output_head); | |
1da177e4 | 290 | |
383d0350 SK |
291 | int esp6_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp) |
292 | { | |
293 | u8 *iv; | |
294 | int alen; | |
295 | void *tmp; | |
296 | int ivlen; | |
297 | int assoclen; | |
298 | int seqhilen; | |
299 | __be32 *seqhi; | |
300 | struct page *page; | |
301 | struct ip_esp_hdr *esph; | |
302 | struct aead_request *req; | |
303 | struct crypto_aead *aead; | |
304 | struct scatterlist *sg, *dsg; | |
305 | int err = -ENOMEM; | |
306 | ||
307 | assoclen = sizeof(struct ip_esp_hdr); | |
308 | seqhilen = 0; | |
309 | ||
310 | if (x->props.flags & XFRM_STATE_ESN) { | |
311 | seqhilen += sizeof(__be32); | |
312 | assoclen += sizeof(__be32); | |
313 | } | |
1da177e4 | 314 | |
383d0350 SK |
315 | aead = x->data; |
316 | alen = crypto_aead_authsize(aead); | |
317 | ivlen = crypto_aead_ivsize(aead); | |
318 | ||
319 | tmp = esp_alloc_tmp(aead, esp->nfrags + 2, seqhilen); | |
e892d2d4 | 320 | if (!tmp) |
03e2a30f | 321 | goto error; |
000ae7b2 | 322 | |
03e2a30f SK |
323 | seqhi = esp_tmp_seqhi(tmp); |
324 | iv = esp_tmp_iv(aead, tmp, seqhilen); | |
325 | req = esp_tmp_req(aead, iv); | |
326 | sg = esp_req_sg(aead, req); | |
03e2a30f | 327 | |
383d0350 SK |
328 | if (esp->inplace) |
329 | dsg = sg; | |
330 | else | |
331 | dsg = &sg[esp->nfrags]; | |
332 | ||
333 | esph = esp_output_set_esn(skb, x, ip_esp_hdr(skb), seqhi); | |
000ae7b2 | 334 | |
383d0350 | 335 | sg_init_table(sg, esp->nfrags); |
3f297707 JD |
336 | err = skb_to_sgvec(skb, sg, |
337 | (unsigned char *)esph - skb->data, | |
338 | assoclen + ivlen + esp->clen + alen); | |
339 | if (unlikely(err < 0)) | |
e6194923 | 340 | goto error_free; |
383d0350 SK |
341 | |
342 | if (!esp->inplace) { | |
343 | int allocsize; | |
344 | struct page_frag *pfrag = &x->xfrag; | |
345 | ||
346 | allocsize = ALIGN(skb->data_len, L1_CACHE_BYTES); | |
347 | ||
348 | spin_lock_bh(&x->lock); | |
349 | if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) { | |
350 | spin_unlock_bh(&x->lock); | |
e6194923 | 351 | goto error_free; |
383d0350 SK |
352 | } |
353 | ||
354 | skb_shinfo(skb)->nr_frags = 1; | |
355 | ||
356 | page = pfrag->page; | |
357 | get_page(page); | |
358 | /* replace page frags in skb with new page */ | |
359 | __skb_fill_page_desc(skb, 0, page, pfrag->offset, skb->data_len); | |
360 | pfrag->offset = pfrag->offset + allocsize; | |
361 | spin_unlock_bh(&x->lock); | |
362 | ||
363 | sg_init_table(dsg, skb_shinfo(skb)->nr_frags + 1); | |
3f297707 JD |
364 | err = skb_to_sgvec(skb, dsg, |
365 | (unsigned char *)esph - skb->data, | |
366 | assoclen + ivlen + esp->clen + alen); | |
367 | if (unlikely(err < 0)) | |
e6194923 | 368 | goto error_free; |
383d0350 | 369 | } |
d212a4c2 | 370 | |
03e2a30f SK |
371 | if ((x->props.flags & XFRM_STATE_ESN)) |
372 | aead_request_set_callback(req, 0, esp_output_done_esn, skb); | |
373 | else | |
374 | aead_request_set_callback(req, 0, esp_output_done, skb); | |
375 | ||
383d0350 | 376 | aead_request_set_crypt(req, sg, dsg, ivlen + esp->clen, iv); |
000ae7b2 HX |
377 | aead_request_set_ad(req, assoclen); |
378 | ||
000ae7b2 | 379 | memset(iv, 0, ivlen); |
383d0350 | 380 | memcpy(iv + ivlen - min(ivlen, 8), (u8 *)&esp->seqno + 8 - min(ivlen, 8), |
000ae7b2 | 381 | min(ivlen, 8)); |
1da177e4 | 382 | |
38320c70 | 383 | ESP_SKB_CB(skb)->tmp = tmp; |
000ae7b2 HX |
384 | err = crypto_aead_encrypt(req); |
385 | ||
386 | switch (err) { | |
387 | case -EINPROGRESS: | |
38320c70 | 388 | goto error; |
1da177e4 | 389 | |
068c2e70 | 390 | case -ENOSPC: |
38320c70 | 391 | err = NET_XMIT_DROP; |
000ae7b2 HX |
392 | break; |
393 | ||
394 | case 0: | |
395 | if ((x->props.flags & XFRM_STATE_ESN)) | |
396 | esp_output_restore_header(skb); | |
397 | } | |
38320c70 | 398 | |
03e2a30f SK |
399 | if (sg != dsg) |
400 | esp_ssg_unref(x, tmp); | |
38320c70 | 401 | |
e6194923 SK |
402 | error_free: |
403 | kfree(tmp); | |
38320c70 HX |
404 | error: |
405 | return err; | |
406 | } | |
383d0350 SK |
407 | EXPORT_SYMBOL_GPL(esp6_output_tail); |
408 | ||
409 | static int esp6_output(struct xfrm_state *x, struct sk_buff *skb) | |
410 | { | |
411 | int alen; | |
412 | int blksize; | |
413 | struct ip_esp_hdr *esph; | |
414 | struct crypto_aead *aead; | |
415 | struct esp_info esp; | |
416 | ||
417 | esp.inplace = true; | |
418 | ||
419 | esp.proto = *skb_mac_header(skb); | |
420 | *skb_mac_header(skb) = IPPROTO_ESP; | |
421 | ||
422 | /* skb is pure payload to encrypt */ | |
423 | ||
424 | aead = x->data; | |
425 | alen = crypto_aead_authsize(aead); | |
426 | ||
427 | esp.tfclen = 0; | |
428 | if (x->tfcpad) { | |
429 | struct xfrm_dst *dst = (struct xfrm_dst *)skb_dst(skb); | |
430 | u32 padto; | |
431 | ||
c7b37c76 | 432 | padto = min(x->tfcpad, xfrm_state_mtu(x, dst->child_mtu_cached)); |
383d0350 SK |
433 | if (skb->len < padto) |
434 | esp.tfclen = padto - skb->len; | |
435 | } | |
436 | blksize = ALIGN(crypto_aead_blocksize(aead), 4); | |
437 | esp.clen = ALIGN(skb->len + 2 + esp.tfclen, blksize); | |
438 | esp.plen = esp.clen - skb->len - esp.tfclen; | |
439 | esp.tailen = esp.tfclen + esp.plen + alen; | |
440 | ||
441 | esp.nfrags = esp6_output_head(x, skb, &esp); | |
442 | if (esp.nfrags < 0) | |
443 | return esp.nfrags; | |
444 | ||
445 | esph = ip_esp_hdr(skb); | |
446 | esph->spi = x->id.spi; | |
447 | ||
448 | esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low); | |
449 | esp.seqno = cpu_to_be64(XFRM_SKB_CB(skb)->seq.output.low + | |
450 | ((u64)XFRM_SKB_CB(skb)->seq.output.hi << 32)); | |
451 | ||
452 | skb_push(skb, -skb_network_offset(skb)); | |
453 | ||
454 | return esp6_output_tail(x, skb, &esp); | |
455 | } | |
38320c70 | 456 | |
47ebcc0b | 457 | static inline int esp_remove_trailer(struct sk_buff *skb) |
38320c70 HX |
458 | { |
459 | struct xfrm_state *x = xfrm_input_state(skb); | |
d77e38e6 | 460 | struct xfrm_offload *xo = xfrm_offload(skb); |
1c5ad13f | 461 | struct crypto_aead *aead = x->data; |
47ebcc0b | 462 | int alen, hlen, elen; |
e51a6472 IT |
463 | int padlen, trimlen; |
464 | __wsum csumdiff; | |
38320c70 | 465 | u8 nexthdr[2]; |
47ebcc0b | 466 | int ret; |
38320c70 | 467 | |
47ebcc0b YK |
468 | alen = crypto_aead_authsize(aead); |
469 | hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead); | |
470 | elen = skb->len - hlen; | |
1da177e4 | 471 | |
47ebcc0b YK |
472 | if (xo && (xo->flags & XFRM_ESP_NO_TRAILER)) { |
473 | ret = xo->proto; | |
38320c70 | 474 | goto out; |
47ebcc0b | 475 | } |
6b7326c8 | 476 | |
eee12df5 GS |
477 | ret = skb_copy_bits(skb, skb->len - alen - 2, nexthdr, 2); |
478 | BUG_ON(ret); | |
1da177e4 | 479 | |
47ebcc0b | 480 | ret = -EINVAL; |
38320c70 HX |
481 | padlen = nexthdr[0]; |
482 | if (padlen + 2 + alen >= elen) { | |
ba7a46f1 JP |
483 | net_dbg_ratelimited("ipsec esp packet is garbage padlen=%d, elen=%d\n", |
484 | padlen + 2, elen - alen); | |
38320c70 | 485 | goto out; |
1da177e4 LT |
486 | } |
487 | ||
e51a6472 IT |
488 | trimlen = alen + padlen + 2; |
489 | if (skb->ip_summed == CHECKSUM_COMPLETE) { | |
490 | csumdiff = skb_checksum(skb, skb->len - trimlen, trimlen, 0); | |
491 | skb->csum = csum_block_sub(skb->csum, csumdiff, | |
492 | skb->len - trimlen); | |
493 | } | |
494 | pskb_trim(skb, skb->len - trimlen); | |
495 | ||
47ebcc0b YK |
496 | ret = nexthdr[1]; |
497 | ||
498 | out: | |
499 | return ret; | |
500 | } | |
501 | ||
502 | int esp6_input_done2(struct sk_buff *skb, int err) | |
503 | { | |
504 | struct xfrm_state *x = xfrm_input_state(skb); | |
505 | struct xfrm_offload *xo = xfrm_offload(skb); | |
506 | struct crypto_aead *aead = x->data; | |
507 | int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead); | |
508 | int hdr_len = skb_network_header_len(skb); | |
509 | ||
510 | if (!xo || (xo && !(xo->flags & CRYPTO_DONE))) | |
511 | kfree(ESP_SKB_CB(skb)->tmp); | |
512 | ||
513 | if (unlikely(err)) | |
514 | goto out; | |
515 | ||
516 | err = esp_remove_trailer(skb); | |
517 | if (unlikely(err < 0)) | |
518 | goto out; | |
519 | ||
520 | skb_postpull_rcsum(skb, skb_network_header(skb), | |
521 | skb_network_header_len(skb)); | |
e51a6472 | 522 | skb_pull_rcsum(skb, hlen); |
a9403f8a LR |
523 | if (x->props.mode == XFRM_MODE_TUNNEL) |
524 | skb_reset_transport_header(skb); | |
525 | else | |
526 | skb_set_transport_header(skb, -hdr_len); | |
38320c70 | 527 | |
38320c70 HX |
528 | /* RFC4303: Drop dummy packets without any error */ |
529 | if (err == IPPROTO_NONE) | |
530 | err = -EINVAL; | |
531 | ||
532 | out: | |
1da177e4 LT |
533 | return err; |
534 | } | |
383d0350 | 535 | EXPORT_SYMBOL_GPL(esp6_input_done2); |
1da177e4 | 536 | |
38320c70 HX |
537 | static void esp_input_done(struct crypto_async_request *base, int err) |
538 | { | |
539 | struct sk_buff *skb = base->data; | |
540 | ||
f1fbed0e | 541 | xfrm_input_resume(skb, esp6_input_done2(skb, err)); |
38320c70 HX |
542 | } |
543 | ||
000ae7b2 HX |
544 | static void esp_input_restore_header(struct sk_buff *skb) |
545 | { | |
546 | esp_restore_header(skb, 0); | |
547 | __skb_pull(skb, 4); | |
548 | } | |
549 | ||
03e2a30f SK |
550 | static void esp_input_set_header(struct sk_buff *skb, __be32 *seqhi) |
551 | { | |
552 | struct xfrm_state *x = xfrm_input_state(skb); | |
03e2a30f SK |
553 | |
554 | /* For ESN we move the header forward by 4 bytes to | |
555 | * accomodate the high bits. We will move it back after | |
556 | * decryption. | |
557 | */ | |
558 | if ((x->props.flags & XFRM_STATE_ESN)) { | |
d3cc547d CIK |
559 | struct ip_esp_hdr *esph = skb_push(skb, 4); |
560 | ||
03e2a30f SK |
561 | *seqhi = esph->spi; |
562 | esph->spi = esph->seq_no; | |
563 | esph->seq_no = XFRM_SKB_CB(skb)->seq.input.hi; | |
564 | } | |
565 | } | |
566 | ||
000ae7b2 HX |
567 | static void esp_input_done_esn(struct crypto_async_request *base, int err) |
568 | { | |
569 | struct sk_buff *skb = base->data; | |
570 | ||
571 | esp_input_restore_header(skb); | |
572 | esp_input_done(base, err); | |
573 | } | |
574 | ||
e695633e | 575 | static int esp6_input(struct xfrm_state *x, struct sk_buff *skb) |
1da177e4 | 576 | { |
1c5ad13f | 577 | struct crypto_aead *aead = x->data; |
38320c70 | 578 | struct aead_request *req; |
1da177e4 | 579 | struct sk_buff *trailer; |
000ae7b2 | 580 | int ivlen = crypto_aead_ivsize(aead); |
0c05f983 | 581 | int elen = skb->len - sizeof(struct ip_esp_hdr) - ivlen; |
1da177e4 | 582 | int nfrags; |
d212a4c2 | 583 | int assoclen; |
d212a4c2 | 584 | int seqhilen; |
1da177e4 | 585 | int ret = 0; |
38320c70 | 586 | void *tmp; |
d212a4c2 | 587 | __be32 *seqhi; |
38320c70 HX |
588 | u8 *iv; |
589 | struct scatterlist *sg; | |
1da177e4 | 590 | |
0c05f983 | 591 | if (!pskb_may_pull(skb, sizeof(struct ip_esp_hdr) + ivlen)) { |
1da177e4 | 592 | ret = -EINVAL; |
31a4ab93 | 593 | goto out; |
1da177e4 LT |
594 | } |
595 | ||
38320c70 | 596 | if (elen <= 0) { |
1da177e4 | 597 | ret = -EINVAL; |
31a4ab93 | 598 | goto out; |
1da177e4 | 599 | } |
1da177e4 | 600 | |
0c05f983 | 601 | assoclen = sizeof(struct ip_esp_hdr); |
d212a4c2 SK |
602 | seqhilen = 0; |
603 | ||
604 | if (x->props.flags & XFRM_STATE_ESN) { | |
d212a4c2 SK |
605 | seqhilen += sizeof(__be32); |
606 | assoclen += seqhilen; | |
607 | } | |
608 | ||
03e2a30f SK |
609 | if (!skb_cloned(skb)) { |
610 | if (!skb_is_nonlinear(skb)) { | |
611 | nfrags = 1; | |
612 | ||
613 | goto skip_cow; | |
614 | } else if (!skb_has_frag_list(skb)) { | |
615 | nfrags = skb_shinfo(skb)->nr_frags; | |
616 | nfrags++; | |
617 | ||
618 | goto skip_cow; | |
619 | } | |
620 | } | |
621 | ||
622 | nfrags = skb_cow_data(skb, 0, &trailer); | |
623 | if (nfrags < 0) { | |
624 | ret = -EINVAL; | |
625 | goto out; | |
626 | } | |
627 | ||
628 | skip_cow: | |
629 | ret = -ENOMEM; | |
000ae7b2 | 630 | tmp = esp_alloc_tmp(aead, nfrags, seqhilen); |
38320c70 HX |
631 | if (!tmp) |
632 | goto out; | |
1da177e4 | 633 | |
38320c70 | 634 | ESP_SKB_CB(skb)->tmp = tmp; |
d212a4c2 SK |
635 | seqhi = esp_tmp_seqhi(tmp); |
636 | iv = esp_tmp_iv(aead, tmp, seqhilen); | |
38320c70 | 637 | req = esp_tmp_req(aead, iv); |
000ae7b2 | 638 | sg = esp_req_sg(aead, req); |
1da177e4 | 639 | |
03e2a30f | 640 | esp_input_set_header(skb, seqhi); |
1da177e4 | 641 | |
03e2a30f | 642 | sg_init_table(sg, nfrags); |
3f297707 | 643 | ret = skb_to_sgvec(skb, sg, 0, skb->len); |
7284fdf3 ZL |
644 | if (unlikely(ret < 0)) { |
645 | kfree(tmp); | |
3f297707 | 646 | goto out; |
7284fdf3 | 647 | } |
1da177e4 | 648 | |
03e2a30f | 649 | skb->ip_summed = CHECKSUM_NONE; |
d212a4c2 | 650 | |
03e2a30f | 651 | if ((x->props.flags & XFRM_STATE_ESN)) |
000ae7b2 | 652 | aead_request_set_callback(req, 0, esp_input_done_esn, skb); |
03e2a30f SK |
653 | else |
654 | aead_request_set_callback(req, 0, esp_input_done, skb); | |
000ae7b2 HX |
655 | |
656 | aead_request_set_crypt(req, sg, sg, elen + ivlen, iv); | |
657 | aead_request_set_ad(req, assoclen); | |
1da177e4 | 658 | |
38320c70 HX |
659 | ret = crypto_aead_decrypt(req); |
660 | if (ret == -EINPROGRESS) | |
661 | goto out; | |
95a02cfd | 662 | |
000ae7b2 HX |
663 | if ((x->props.flags & XFRM_STATE_ESN)) |
664 | esp_input_restore_header(skb); | |
665 | ||
f1fbed0e | 666 | ret = esp6_input_done2(skb, ret); |
1da177e4 LT |
667 | |
668 | out: | |
1da177e4 LT |
669 | return ret; |
670 | } | |
671 | ||
d5860c5c SK |
672 | static int esp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
673 | u8 type, u8 code, int offset, __be32 info) | |
1da177e4 | 674 | { |
4fb236ba | 675 | struct net *net = dev_net(skb->dev); |
b71d1d42 | 676 | const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data; |
87bdc48d | 677 | struct ip_esp_hdr *esph = (struct ip_esp_hdr *)(skb->data + offset); |
1da177e4 LT |
678 | struct xfrm_state *x; |
679 | ||
b3b2b9e1 | 680 | if (type != ICMPV6_PKT_TOOBIG && |
ec18d9a2 | 681 | type != NDISC_REDIRECT) |
d5860c5c | 682 | return 0; |
1da177e4 | 683 | |
b71d1d42 ED |
684 | x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr, |
685 | esph->spi, IPPROTO_ESP, AF_INET6); | |
1da177e4 | 686 | if (!x) |
d5860c5c | 687 | return 0; |
ec18d9a2 DM |
688 | |
689 | if (type == NDISC_REDIRECT) | |
e2d118a1 LC |
690 | ip6_redirect(skb, net, skb->dev->ifindex, 0, |
691 | sock_net_uid(net, NULL)); | |
ec18d9a2 | 692 | else |
e2d118a1 | 693 | ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); |
1da177e4 | 694 | xfrm_state_put(x); |
d5860c5c SK |
695 | |
696 | return 0; | |
1da177e4 LT |
697 | } |
698 | ||
699 | static void esp6_destroy(struct xfrm_state *x) | |
700 | { | |
1c5ad13f | 701 | struct crypto_aead *aead = x->data; |
1da177e4 | 702 | |
1c5ad13f | 703 | if (!aead) |
1da177e4 LT |
704 | return; |
705 | ||
1c5ad13f | 706 | crypto_free_aead(aead); |
1da177e4 LT |
707 | } |
708 | ||
1a6509d9 HX |
709 | static int esp_init_aead(struct xfrm_state *x) |
710 | { | |
000ae7b2 | 711 | char aead_name[CRYPTO_MAX_ALG_NAME]; |
1a6509d9 HX |
712 | struct crypto_aead *aead; |
713 | int err; | |
714 | ||
000ae7b2 HX |
715 | err = -ENAMETOOLONG; |
716 | if (snprintf(aead_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", | |
717 | x->geniv, x->aead->alg_name) >= CRYPTO_MAX_ALG_NAME) | |
718 | goto error; | |
719 | ||
f58869c4 | 720 | aead = crypto_alloc_aead(aead_name, 0, 0); |
1a6509d9 HX |
721 | err = PTR_ERR(aead); |
722 | if (IS_ERR(aead)) | |
723 | goto error; | |
724 | ||
1c5ad13f | 725 | x->data = aead; |
1a6509d9 HX |
726 | |
727 | err = crypto_aead_setkey(aead, x->aead->alg_key, | |
728 | (x->aead->alg_key_len + 7) / 8); | |
729 | if (err) | |
730 | goto error; | |
731 | ||
732 | err = crypto_aead_setauthsize(aead, x->aead->alg_icv_len / 8); | |
733 | if (err) | |
734 | goto error; | |
735 | ||
736 | error: | |
737 | return err; | |
738 | } | |
739 | ||
740 | static int esp_init_authenc(struct xfrm_state *x) | |
1da177e4 | 741 | { |
38320c70 HX |
742 | struct crypto_aead *aead; |
743 | struct crypto_authenc_key_param *param; | |
744 | struct rtattr *rta; | |
745 | char *key; | |
746 | char *p; | |
747 | char authenc_name[CRYPTO_MAX_ALG_NAME]; | |
38320c70 HX |
748 | unsigned int keylen; |
749 | int err; | |
1da177e4 | 750 | |
1a6509d9 | 751 | err = -EINVAL; |
63159f29 | 752 | if (!x->ealg) |
1a6509d9 | 753 | goto error; |
38320c70 | 754 | |
1a6509d9 | 755 | err = -ENAMETOOLONG; |
d212a4c2 SK |
756 | |
757 | if ((x->props.flags & XFRM_STATE_ESN)) { | |
758 | if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME, | |
000ae7b2 HX |
759 | "%s%sauthencesn(%s,%s)%s", |
760 | x->geniv ?: "", x->geniv ? "(" : "", | |
d212a4c2 | 761 | x->aalg ? x->aalg->alg_name : "digest_null", |
000ae7b2 HX |
762 | x->ealg->alg_name, |
763 | x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME) | |
d212a4c2 SK |
764 | goto error; |
765 | } else { | |
766 | if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME, | |
000ae7b2 HX |
767 | "%s%sauthenc(%s,%s)%s", |
768 | x->geniv ?: "", x->geniv ? "(" : "", | |
d212a4c2 | 769 | x->aalg ? x->aalg->alg_name : "digest_null", |
000ae7b2 HX |
770 | x->ealg->alg_name, |
771 | x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME) | |
d212a4c2 SK |
772 | goto error; |
773 | } | |
38320c70 | 774 | |
f58869c4 | 775 | aead = crypto_alloc_aead(authenc_name, 0, 0); |
38320c70 HX |
776 | err = PTR_ERR(aead); |
777 | if (IS_ERR(aead)) | |
778 | goto error; | |
779 | ||
1c5ad13f | 780 | x->data = aead; |
38320c70 HX |
781 | |
782 | keylen = (x->aalg ? (x->aalg->alg_key_len + 7) / 8 : 0) + | |
783 | (x->ealg->alg_key_len + 7) / 8 + RTA_SPACE(sizeof(*param)); | |
784 | err = -ENOMEM; | |
785 | key = kmalloc(keylen, GFP_KERNEL); | |
786 | if (!key) | |
787 | goto error; | |
788 | ||
789 | p = key; | |
790 | rta = (void *)p; | |
791 | rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM; | |
792 | rta->rta_len = RTA_LENGTH(sizeof(*param)); | |
793 | param = RTA_DATA(rta); | |
794 | p += RTA_SPACE(sizeof(*param)); | |
795 | ||
1da177e4 LT |
796 | if (x->aalg) { |
797 | struct xfrm_algo_desc *aalg_desc; | |
798 | ||
38320c70 HX |
799 | memcpy(p, x->aalg->alg_key, (x->aalg->alg_key_len + 7) / 8); |
800 | p += (x->aalg->alg_key_len + 7) / 8; | |
1ab1457c | 801 | |
1da177e4 LT |
802 | aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0); |
803 | BUG_ON(!aalg_desc); | |
1ab1457c | 804 | |
38320c70 | 805 | err = -EINVAL; |
45083497 | 806 | if (aalg_desc->uinfo.auth.icv_fullbits / 8 != |
38320c70 | 807 | crypto_aead_authsize(aead)) { |
45083497 JP |
808 | pr_info("ESP: %s digestsize %u != %hu\n", |
809 | x->aalg->alg_name, | |
810 | crypto_aead_authsize(aead), | |
811 | aalg_desc->uinfo.auth.icv_fullbits / 8); | |
38320c70 | 812 | goto free_key; |
1da177e4 | 813 | } |
1ab1457c | 814 | |
38320c70 | 815 | err = crypto_aead_setauthsize( |
8f8a088c | 816 | aead, x->aalg->alg_trunc_len / 8); |
38320c70 HX |
817 | if (err) |
818 | goto free_key; | |
1da177e4 | 819 | } |
38320c70 | 820 | |
38320c70 HX |
821 | param->enckeylen = cpu_to_be32((x->ealg->alg_key_len + 7) / 8); |
822 | memcpy(p, x->ealg->alg_key, (x->ealg->alg_key_len + 7) / 8); | |
823 | ||
824 | err = crypto_aead_setkey(aead, key, keylen); | |
825 | ||
826 | free_key: | |
827 | kfree(key); | |
828 | ||
1a6509d9 HX |
829 | error: |
830 | return err; | |
831 | } | |
832 | ||
833 | static int esp6_init_state(struct xfrm_state *x) | |
834 | { | |
1a6509d9 HX |
835 | struct crypto_aead *aead; |
836 | u32 align; | |
837 | int err; | |
838 | ||
839 | if (x->encap) | |
840 | return -EINVAL; | |
841 | ||
1c5ad13f | 842 | x->data = NULL; |
1a6509d9 HX |
843 | |
844 | if (x->aead) | |
845 | err = esp_init_aead(x); | |
846 | else | |
847 | err = esp_init_authenc(x); | |
848 | ||
38320c70 | 849 | if (err) |
1da177e4 | 850 | goto error; |
38320c70 | 851 | |
1c5ad13f | 852 | aead = x->data; |
1a6509d9 | 853 | |
38320c70 HX |
854 | x->props.header_len = sizeof(struct ip_esp_hdr) + |
855 | crypto_aead_ivsize(aead); | |
ca68145f HX |
856 | switch (x->props.mode) { |
857 | case XFRM_MODE_BEET: | |
abf5cdb8 JK |
858 | if (x->sel.family != AF_INET6) |
859 | x->props.header_len += IPV4_BEET_PHMAXLEN + | |
67ba4152 | 860 | (sizeof(struct ipv6hdr) - sizeof(struct iphdr)); |
abf5cdb8 | 861 | break; |
bcfd09f7 | 862 | default: |
ca68145f HX |
863 | case XFRM_MODE_TRANSPORT: |
864 | break; | |
865 | case XFRM_MODE_TUNNEL: | |
1da177e4 | 866 | x->props.header_len += sizeof(struct ipv6hdr); |
ea2c47b4 | 867 | break; |
ca68145f | 868 | } |
38320c70 HX |
869 | |
870 | align = ALIGN(crypto_aead_blocksize(aead), 4); | |
1c5ad13f | 871 | x->props.trailer_len = align + 1 + crypto_aead_authsize(aead); |
1da177e4 LT |
872 | |
873 | error: | |
38320c70 | 874 | return err; |
1da177e4 LT |
875 | } |
876 | ||
d5860c5c SK |
877 | static int esp6_rcv_cb(struct sk_buff *skb, int err) |
878 | { | |
879 | return 0; | |
880 | } | |
881 | ||
cc24beca | 882 | static const struct xfrm_type esp6_type = { |
1da177e4 | 883 | .description = "ESP6", |
cc24beca IM |
884 | .owner = THIS_MODULE, |
885 | .proto = IPPROTO_ESP, | |
436a0a40 | 886 | .flags = XFRM_TYPE_REPLAY_PROT, |
1da177e4 LT |
887 | .init_state = esp6_init_state, |
888 | .destructor = esp6_destroy, | |
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__); |
4f518e80 | 920 | xfrm_unregister_type(&esp6_type, AF_INET6); |
1da177e4 LT |
921 | } |
922 | ||
923 | module_init(esp6_init); | |
924 | module_exit(esp6_fini); | |
925 | ||
926 | MODULE_LICENSE("GPL"); | |
d3d6dd3a | 927 | MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_ESP); |