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1 | #include <crypto/aead.h> |
2 | #include <crypto/authenc.h> |
3 | #include <linux/err.h> |
4 | #include <linux/module.h> |
5 | #include <net/ip.h> |
6 | #include <net/xfrm.h> |
7 | #include <net/esp.h> |
8 | #include <linux/scatterlist.h> |
9 | #include <linux/kernel.h> |
10 | #include <linux/pfkeyv2.h> |
11 | #include <linux/rtnetlink.h> |
12 | #include <linux/slab.h> |
13 | #include <linux/spinlock.h> |
14 | #include <linux/in6.h> |
15 | #include <net/icmp.h> |
16 | #include <net/protocol.h> |
17 | #include <net/udp.h> |
18 | |
19 | struct esp_skb_cb { |
20 | struct xfrm_skb_cb xfrm; |
21 | void *tmp; |
22 | }; |
23 | |
24 | #define ESP_SKB_CB(__skb) ((struct esp_skb_cb *)&((__skb)->cb[0])) |
25 | |
26 | static u32 esp4_get_mtu(struct xfrm_state *x, int mtu); |
27 | |
28 | /* |
29 | * Allocate an AEAD request structure with extra space for SG and IV. |
30 | * |
31 | * For alignment considerations the IV is placed at the front, followed |
32 | * by the request and finally the SG list. |
33 | * |
34 | * TODO: Use spare space in skb for this where possible. |
35 | */ |
36 | static void *esp_alloc_tmp(struct crypto_aead *aead, int nfrags, int seqhilen) |
37 | { |
38 | unsigned int len; |
39 | |
40 | len = seqhilen; |
41 | |
42 | len += crypto_aead_ivsize(aead); |
43 | |
44 | if (len) { |
45 | len += crypto_aead_alignmask(aead) & |
46 | ~(crypto_tfm_ctx_alignment() - 1); |
47 | len = ALIGN(len, crypto_tfm_ctx_alignment()); |
48 | } |
49 | |
50 | len += sizeof(struct aead_givcrypt_request) + crypto_aead_reqsize(aead); |
51 | len = ALIGN(len, __alignof__(struct scatterlist)); |
52 | |
53 | len += sizeof(struct scatterlist) * nfrags; |
54 | |
55 | return kmalloc(len, GFP_ATOMIC); |
56 | } |
57 | |
58 | static inline __be32 *esp_tmp_seqhi(void *tmp) |
59 | { |
60 | return PTR_ALIGN((__be32 *)tmp, __alignof__(__be32)); |
61 | } |
62 | static inline u8 *esp_tmp_iv(struct crypto_aead *aead, void *tmp, int seqhilen) |
63 | { |
64 | return crypto_aead_ivsize(aead) ? |
65 | PTR_ALIGN((u8 *)tmp + seqhilen, |
66 | crypto_aead_alignmask(aead) + 1) : tmp + seqhilen; |
67 | } |
68 | |
69 | static inline struct aead_givcrypt_request *esp_tmp_givreq( |
70 | struct crypto_aead *aead, u8 *iv) |
71 | { |
72 | struct aead_givcrypt_request *req; |
73 | |
74 | req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead), |
75 | crypto_tfm_ctx_alignment()); |
76 | aead_givcrypt_set_tfm(req, aead); |
77 | return req; |
78 | } |
79 | |
80 | static inline struct aead_request *esp_tmp_req(struct crypto_aead *aead, u8 *iv) |
81 | { |
82 | struct aead_request *req; |
83 | |
84 | req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead), |
85 | crypto_tfm_ctx_alignment()); |
86 | aead_request_set_tfm(req, aead); |
87 | return req; |
88 | } |
89 | |
90 | static inline struct scatterlist *esp_req_sg(struct crypto_aead *aead, |
91 | struct aead_request *req) |
92 | { |
93 | return (void *)ALIGN((unsigned long)(req + 1) + |
94 | crypto_aead_reqsize(aead), |
95 | __alignof__(struct scatterlist)); |
96 | } |
97 | |
98 | static inline struct scatterlist *esp_givreq_sg( |
99 | struct crypto_aead *aead, struct aead_givcrypt_request *req) |
100 | { |
101 | return (void *)ALIGN((unsigned long)(req + 1) + |
102 | crypto_aead_reqsize(aead), |
103 | __alignof__(struct scatterlist)); |
104 | } |
105 | |
106 | static void esp_output_done(struct crypto_async_request *base, int err) |
107 | { |
108 | struct sk_buff *skb = base->data; |
109 | |
110 | kfree(ESP_SKB_CB(skb)->tmp); |
111 | xfrm_output_resume(skb, err); |
112 | } |
113 | |
114 | static int esp_output(struct xfrm_state *x, struct sk_buff *skb) |
115 | { |
116 | int err; |
117 | struct ip_esp_hdr *esph; |
118 | struct crypto_aead *aead; |
119 | struct aead_givcrypt_request *req; |
120 | struct scatterlist *sg; |
121 | struct scatterlist *asg; |
122 | struct esp_data *esp; |
123 | struct sk_buff *trailer; |
124 | void *tmp; |
125 | u8 *iv; |
126 | u8 *tail; |
127 | int blksize; |
128 | int clen; |
129 | int alen; |
130 | int plen; |
131 | int tfclen; |
132 | int nfrags; |
133 | int assoclen; |
134 | int sglists; |
135 | int seqhilen; |
136 | __be32 *seqhi; |
137 | |
138 | /* skb is pure payload to encrypt */ |
139 | |
140 | err = -ENOMEM; |
141 | |
142 | esp = x->data; |
143 | aead = esp->aead; |
144 | alen = crypto_aead_authsize(aead); |
145 | |
146 | tfclen = 0; |
147 | if (x->tfcpad) { |
148 | struct xfrm_dst *dst = (struct xfrm_dst *)skb_dst(skb); |
149 | u32 padto; |
150 | |
151 | padto = min(x->tfcpad, esp4_get_mtu(x, dst->child_mtu_cached)); |
152 | if (skb->len < padto) |
153 | tfclen = padto - skb->len; |
154 | } |
155 | blksize = ALIGN(crypto_aead_blocksize(aead), 4); |
156 | clen = ALIGN(skb->len + 2 + tfclen, blksize); |
157 | if (esp->padlen) |
158 | clen = ALIGN(clen, esp->padlen); |
159 | plen = clen - skb->len - tfclen; |
160 | |
161 | err = skb_cow_data(skb, tfclen + plen + alen, &trailer); |
162 | if (err < 0) |
163 | goto error; |
164 | nfrags = err; |
165 | |
166 | assoclen = sizeof(*esph); |
167 | sglists = 1; |
168 | seqhilen = 0; |
169 | |
170 | if (x->props.flags & XFRM_STATE_ESN) { |
171 | sglists += 2; |
172 | seqhilen += sizeof(__be32); |
173 | assoclen += seqhilen; |
174 | } |
175 | |
176 | tmp = esp_alloc_tmp(aead, nfrags + sglists, seqhilen); |
177 | if (!tmp) |
178 | goto error; |
179 | |
180 | seqhi = esp_tmp_seqhi(tmp); |
181 | iv = esp_tmp_iv(aead, tmp, seqhilen); |
182 | req = esp_tmp_givreq(aead, iv); |
183 | asg = esp_givreq_sg(aead, req); |
184 | sg = asg + sglists; |
185 | |
186 | /* Fill padding... */ |
187 | tail = skb_tail_pointer(trailer); |
188 | if (tfclen) { |
189 | memset(tail, 0, tfclen); |
190 | tail += tfclen; |
191 | } |
192 | do { |
193 | int i; |
194 | for (i = 0; i < plen - 2; i++) |
195 | tail[i] = i + 1; |
196 | } while (0); |
197 | tail[plen - 2] = plen - 2; |
198 | tail[plen - 1] = *skb_mac_header(skb); |
199 | pskb_put(skb, trailer, clen - skb->len + alen); |
200 | |
201 | skb_push(skb, -skb_network_offset(skb)); |
202 | esph = ip_esp_hdr(skb); |
203 | *skb_mac_header(skb) = IPPROTO_ESP; |
204 | |
205 | /* this is non-NULL only with UDP Encapsulation */ |
206 | if (x->encap) { |
207 | struct xfrm_encap_tmpl *encap = x->encap; |
208 | struct udphdr *uh; |
209 | __be32 *udpdata32; |
210 | __be16 sport, dport; |
211 | int encap_type; |
212 | |
213 | spin_lock_bh(&x->lock); |
214 | sport = encap->encap_sport; |
215 | dport = encap->encap_dport; |
216 | encap_type = encap->encap_type; |
217 | spin_unlock_bh(&x->lock); |
218 | |
219 | uh = (struct udphdr *)esph; |
220 | uh->source = sport; |
221 | uh->dest = dport; |
222 | uh->len = htons(skb->len - skb_transport_offset(skb)); |
223 | uh->check = 0; |
224 | |
225 | switch (encap_type) { |
226 | default: |
227 | case UDP_ENCAP_ESPINUDP: |
228 | esph = (struct ip_esp_hdr *)(uh + 1); |
229 | break; |
230 | case UDP_ENCAP_ESPINUDP_NON_IKE: |
231 | udpdata32 = (__be32 *)(uh + 1); |
232 | udpdata32[0] = udpdata32[1] = 0; |
233 | esph = (struct ip_esp_hdr *)(udpdata32 + 2); |
234 | break; |
235 | } |
236 | |
237 | *skb_mac_header(skb) = IPPROTO_UDP; |
238 | } |
239 | |
240 | esph->spi = x->id.spi; |
241 | esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low); |
242 | |
243 | sg_init_table(sg, nfrags); |
244 | skb_to_sgvec(skb, sg, |
245 | esph->enc_data + crypto_aead_ivsize(aead) - skb->data, |
246 | clen + alen); |
247 | |
248 | if ((x->props.flags & XFRM_STATE_ESN)) { |
249 | sg_init_table(asg, 3); |
250 | sg_set_buf(asg, &esph->spi, sizeof(__be32)); |
251 | *seqhi = htonl(XFRM_SKB_CB(skb)->seq.output.hi); |
252 | sg_set_buf(asg + 1, seqhi, seqhilen); |
253 | sg_set_buf(asg + 2, &esph->seq_no, sizeof(__be32)); |
254 | } else |
255 | sg_init_one(asg, esph, sizeof(*esph)); |
256 | |
257 | aead_givcrypt_set_callback(req, 0, esp_output_done, skb); |
258 | aead_givcrypt_set_crypt(req, sg, sg, clen, iv); |
259 | aead_givcrypt_set_assoc(req, asg, assoclen); |
260 | aead_givcrypt_set_giv(req, esph->enc_data, |
261 | XFRM_SKB_CB(skb)->seq.output.low); |
262 | |
263 | ESP_SKB_CB(skb)->tmp = tmp; |
264 | err = crypto_aead_givencrypt(req); |
265 | if (err == -EINPROGRESS) |
266 | goto error; |
267 | |
268 | if (err == -EBUSY) |
269 | err = NET_XMIT_DROP; |
270 | |
271 | kfree(tmp); |
272 | |
273 | error: |
274 | return err; |
275 | } |
276 | |
277 | static int esp_input_done2(struct sk_buff *skb, int err) |
278 | { |
279 | struct iphdr *iph; |
280 | struct xfrm_state *x = xfrm_input_state(skb); |
281 | struct esp_data *esp = x->data; |
282 | struct crypto_aead *aead = esp->aead; |
283 | int alen = crypto_aead_authsize(aead); |
284 | int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead); |
285 | int elen = skb->len - hlen; |
286 | int ihl; |
287 | u8 nexthdr[2]; |
288 | int padlen; |
289 | |
290 | kfree(ESP_SKB_CB(skb)->tmp); |
291 | |
292 | if (unlikely(err)) |
293 | goto out; |
294 | |
295 | if (skb_copy_bits(skb, skb->len-alen-2, nexthdr, 2)) |
296 | BUG(); |
297 | |
298 | err = -EINVAL; |
299 | padlen = nexthdr[0]; |
300 | if (padlen + 2 + alen >= elen) |
301 | goto out; |
302 | |
303 | /* ... check padding bits here. Silly. :-) */ |
304 | |
305 | iph = ip_hdr(skb); |
306 | ihl = iph->ihl * 4; |
307 | |
308 | if (x->encap) { |
309 | struct xfrm_encap_tmpl *encap = x->encap; |
310 | struct udphdr *uh = (void *)(skb_network_header(skb) + ihl); |
311 | |
312 | /* |
313 | * 1) if the NAT-T peer's IP or port changed then |
314 | * advertize the change to the keying daemon. |
315 | * This is an inbound SA, so just compare |
316 | * SRC ports. |
317 | */ |
318 | if (iph->saddr != x->props.saddr.a4 || |
319 | uh->source != encap->encap_sport) { |
320 | xfrm_address_t ipaddr; |
321 | |
322 | ipaddr.a4 = iph->saddr; |
323 | km_new_mapping(x, &ipaddr, uh->source); |
324 | |
325 | /* XXX: perhaps add an extra |
326 | * policy check here, to see |
327 | * if we should allow or |
328 | * reject a packet from a |
329 | * different source |
330 | * address/port. |
331 | */ |
332 | } |
333 | |
334 | /* |
335 | * 2) ignore UDP/TCP checksums in case |
336 | * of NAT-T in Transport Mode, or |
337 | * perform other post-processing fixes |
338 | * as per draft-ietf-ipsec-udp-encaps-06, |
339 | * section 3.1.2 |
340 | */ |
341 | if (x->props.mode == XFRM_MODE_TRANSPORT) |
342 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
343 | } |
344 | |
345 | pskb_trim(skb, skb->len - alen - padlen - 2); |
346 | __skb_pull(skb, hlen); |
347 | skb_set_transport_header(skb, -ihl); |
348 | |
349 | err = nexthdr[1]; |
350 | |
351 | /* RFC4303: Drop dummy packets without any error */ |
352 | if (err == IPPROTO_NONE) |
353 | err = -EINVAL; |
354 | |
355 | out: |
356 | return err; |
357 | } |
358 | |
359 | static void esp_input_done(struct crypto_async_request *base, int err) |
360 | { |
361 | struct sk_buff *skb = base->data; |
362 | |
363 | xfrm_input_resume(skb, esp_input_done2(skb, err)); |
364 | } |
365 | |
366 | /* |
367 | * Note: detecting truncated vs. non-truncated authentication data is very |
368 | * expensive, so we only support truncated data, which is the recommended |
369 | * and common case. |
370 | */ |
371 | static int esp_input(struct xfrm_state *x, struct sk_buff *skb) |
372 | { |
373 | struct ip_esp_hdr *esph; |
374 | struct esp_data *esp = x->data; |
375 | struct crypto_aead *aead = esp->aead; |
376 | struct aead_request *req; |
377 | struct sk_buff *trailer; |
378 | int elen = skb->len - sizeof(*esph) - crypto_aead_ivsize(aead); |
379 | int nfrags; |
380 | int assoclen; |
381 | int sglists; |
382 | int seqhilen; |
383 | __be32 *seqhi; |
384 | void *tmp; |
385 | u8 *iv; |
386 | struct scatterlist *sg; |
387 | struct scatterlist *asg; |
388 | int err = -EINVAL; |
389 | |
390 | if (!pskb_may_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead))) |
391 | goto out; |
392 | |
393 | if (elen <= 0) |
394 | goto out; |
395 | |
396 | if ((err = skb_cow_data(skb, 0, &trailer)) < 0) |
397 | goto out; |
398 | nfrags = err; |
399 | |
400 | assoclen = sizeof(*esph); |
401 | sglists = 1; |
402 | seqhilen = 0; |
403 | |
404 | if (x->props.flags & XFRM_STATE_ESN) { |
405 | sglists += 2; |
406 | seqhilen += sizeof(__be32); |
407 | assoclen += seqhilen; |
408 | } |
409 | |
410 | err = -ENOMEM; |
411 | tmp = esp_alloc_tmp(aead, nfrags + sglists, seqhilen); |
412 | if (!tmp) |
413 | goto out; |
414 | |
415 | ESP_SKB_CB(skb)->tmp = tmp; |
416 | seqhi = esp_tmp_seqhi(tmp); |
417 | iv = esp_tmp_iv(aead, tmp, seqhilen); |
418 | req = esp_tmp_req(aead, iv); |
419 | asg = esp_req_sg(aead, req); |
420 | sg = asg + sglists; |
421 | |
422 | skb->ip_summed = CHECKSUM_NONE; |
423 | |
424 | esph = (struct ip_esp_hdr *)skb->data; |
425 | |
426 | /* Get ivec. This can be wrong, check against another impls. */ |
427 | iv = esph->enc_data; |
428 | |
429 | sg_init_table(sg, nfrags); |
430 | skb_to_sgvec(skb, sg, sizeof(*esph) + crypto_aead_ivsize(aead), elen); |
431 | |
432 | if ((x->props.flags & XFRM_STATE_ESN)) { |
433 | sg_init_table(asg, 3); |
434 | sg_set_buf(asg, &esph->spi, sizeof(__be32)); |
435 | *seqhi = XFRM_SKB_CB(skb)->seq.input.hi; |
436 | sg_set_buf(asg + 1, seqhi, seqhilen); |
437 | sg_set_buf(asg + 2, &esph->seq_no, sizeof(__be32)); |
438 | } else |
439 | sg_init_one(asg, esph, sizeof(*esph)); |
440 | |
441 | aead_request_set_callback(req, 0, esp_input_done, skb); |
442 | aead_request_set_crypt(req, sg, sg, elen, iv); |
443 | aead_request_set_assoc(req, asg, assoclen); |
444 | |
445 | err = crypto_aead_decrypt(req); |
446 | if (err == -EINPROGRESS) |
447 | goto out; |
448 | |
449 | err = esp_input_done2(skb, err); |
450 | |
451 | out: |
452 | return err; |
453 | } |
454 | |
455 | static u32 esp4_get_mtu(struct xfrm_state *x, int mtu) |
456 | { |
457 | struct esp_data *esp = x->data; |
458 | u32 blksize = ALIGN(crypto_aead_blocksize(esp->aead), 4); |
459 | u32 align = max_t(u32, blksize, esp->padlen); |
460 | u32 rem; |
461 | |
462 | mtu -= x->props.header_len + crypto_aead_authsize(esp->aead); |
463 | rem = mtu & (align - 1); |
464 | mtu &= ~(align - 1); |
465 | |
466 | switch (x->props.mode) { |
467 | case XFRM_MODE_TUNNEL: |
468 | break; |
469 | default: |
470 | case XFRM_MODE_TRANSPORT: |
471 | /* The worst case */ |
472 | mtu -= blksize - 4; |
473 | mtu += min_t(u32, blksize - 4, rem); |
474 | break; |
475 | case XFRM_MODE_BEET: |
476 | /* The worst case. */ |
477 | mtu += min_t(u32, IPV4_BEET_PHMAXLEN, rem); |
478 | break; |
479 | } |
480 | |
481 | return mtu - 2; |
482 | } |
483 | |
484 | static void esp4_err(struct sk_buff *skb, u32 info) |
485 | { |
486 | struct net *net = dev_net(skb->dev); |
487 | struct iphdr *iph = (struct iphdr *)skb->data; |
488 | struct ip_esp_hdr *esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2)); |
489 | struct xfrm_state *x; |
490 | |
491 | if (icmp_hdr(skb)->type != ICMP_DEST_UNREACH || |
492 | icmp_hdr(skb)->code != ICMP_FRAG_NEEDED) |
493 | return; |
494 | |
495 | x = xfrm_state_lookup(net, skb->mark, (xfrm_address_t *)&iph->daddr, esph->spi, IPPROTO_ESP, AF_INET); |
496 | if (!x) |
497 | return; |
498 | NETDEBUG(KERN_DEBUG "pmtu discovery on SA ESP/%08x/%08x\n", |
499 | ntohl(esph->spi), ntohl(iph->daddr)); |
500 | xfrm_state_put(x); |
501 | } |
502 | |
503 | static void esp_destroy(struct xfrm_state *x) |
504 | { |
505 | struct esp_data *esp = x->data; |
506 | |
507 | if (!esp) |
508 | return; |
509 | |
510 | crypto_free_aead(esp->aead); |
511 | kfree(esp); |
512 | } |
513 | |
514 | static int esp_init_aead(struct xfrm_state *x) |
515 | { |
516 | struct esp_data *esp = x->data; |
517 | struct crypto_aead *aead; |
518 | int err; |
519 | |
520 | aead = crypto_alloc_aead(x->aead->alg_name, 0, 0); |
521 | err = PTR_ERR(aead); |
522 | if (IS_ERR(aead)) |
523 | goto error; |
524 | |
525 | esp->aead = aead; |
526 | |
527 | err = crypto_aead_setkey(aead, x->aead->alg_key, |
528 | (x->aead->alg_key_len + 7) / 8); |
529 | if (err) |
530 | goto error; |
531 | |
532 | err = crypto_aead_setauthsize(aead, x->aead->alg_icv_len / 8); |
533 | if (err) |
534 | goto error; |
535 | |
536 | error: |
537 | return err; |
538 | } |
539 | |
540 | static int esp_init_authenc(struct xfrm_state *x) |
541 | { |
542 | struct esp_data *esp = x->data; |
543 | struct crypto_aead *aead; |
544 | struct crypto_authenc_key_param *param; |
545 | struct rtattr *rta; |
546 | char *key; |
547 | char *p; |
548 | char authenc_name[CRYPTO_MAX_ALG_NAME]; |
549 | unsigned int keylen; |
550 | int err; |
551 | |
552 | err = -EINVAL; |
553 | if (x->ealg == NULL) |
554 | goto error; |
555 | |
556 | err = -ENAMETOOLONG; |
557 | |
558 | if ((x->props.flags & XFRM_STATE_ESN)) { |
559 | if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME, |
560 | "authencesn(%s,%s)", |
561 | x->aalg ? x->aalg->alg_name : "digest_null", |
562 | x->ealg->alg_name) >= CRYPTO_MAX_ALG_NAME) |
563 | goto error; |
564 | } else { |
565 | if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME, |
566 | "authenc(%s,%s)", |
567 | x->aalg ? x->aalg->alg_name : "digest_null", |
568 | x->ealg->alg_name) >= CRYPTO_MAX_ALG_NAME) |
569 | goto error; |
570 | } |
571 | |
572 | aead = crypto_alloc_aead(authenc_name, 0, 0); |
573 | err = PTR_ERR(aead); |
574 | if (IS_ERR(aead)) |
575 | goto error; |
576 | |
577 | esp->aead = aead; |
578 | |
579 | keylen = (x->aalg ? (x->aalg->alg_key_len + 7) / 8 : 0) + |
580 | (x->ealg->alg_key_len + 7) / 8 + RTA_SPACE(sizeof(*param)); |
581 | err = -ENOMEM; |
582 | key = kmalloc(keylen, GFP_KERNEL); |
583 | if (!key) |
584 | goto error; |
585 | |
586 | p = key; |
587 | rta = (void *)p; |
588 | rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM; |
589 | rta->rta_len = RTA_LENGTH(sizeof(*param)); |
590 | param = RTA_DATA(rta); |
591 | p += RTA_SPACE(sizeof(*param)); |
592 | |
593 | if (x->aalg) { |
594 | struct xfrm_algo_desc *aalg_desc; |
595 | |
596 | memcpy(p, x->aalg->alg_key, (x->aalg->alg_key_len + 7) / 8); |
597 | p += (x->aalg->alg_key_len + 7) / 8; |
598 | |
599 | aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0); |
600 | BUG_ON(!aalg_desc); |
601 | |
602 | err = -EINVAL; |
603 | if (aalg_desc->uinfo.auth.icv_fullbits/8 != |
604 | crypto_aead_authsize(aead)) { |
605 | NETDEBUG(KERN_INFO "ESP: %s digestsize %u != %hu\n", |
606 | x->aalg->alg_name, |
607 | crypto_aead_authsize(aead), |
608 | aalg_desc->uinfo.auth.icv_fullbits/8); |
609 | goto free_key; |
610 | } |
611 | |
612 | err = crypto_aead_setauthsize( |
613 | aead, x->aalg->alg_trunc_len / 8); |
614 | if (err) |
615 | goto free_key; |
616 | } |
617 | |
618 | param->enckeylen = cpu_to_be32((x->ealg->alg_key_len + 7) / 8); |
619 | memcpy(p, x->ealg->alg_key, (x->ealg->alg_key_len + 7) / 8); |
620 | |
621 | err = crypto_aead_setkey(aead, key, keylen); |
622 | |
623 | free_key: |
624 | kfree(key); |
625 | |
626 | error: |
627 | return err; |
628 | } |
629 | |
630 | static int esp_init_state(struct xfrm_state *x) |
631 | { |
632 | struct esp_data *esp; |
633 | struct crypto_aead *aead; |
634 | u32 align; |
635 | int err; |
636 | |
637 | esp = kzalloc(sizeof(*esp), GFP_KERNEL); |
638 | if (esp == NULL) |
639 | return -ENOMEM; |
640 | |
641 | x->data = esp; |
642 | |
643 | if (x->aead) |
644 | err = esp_init_aead(x); |
645 | else |
646 | err = esp_init_authenc(x); |
647 | |
648 | if (err) |
649 | goto error; |
650 | |
651 | aead = esp->aead; |
652 | |
653 | esp->padlen = 0; |
654 | |
655 | x->props.header_len = sizeof(struct ip_esp_hdr) + |
656 | crypto_aead_ivsize(aead); |
657 | if (x->props.mode == XFRM_MODE_TUNNEL) |
658 | x->props.header_len += sizeof(struct iphdr); |
659 | else if (x->props.mode == XFRM_MODE_BEET && x->sel.family != AF_INET6) |
660 | x->props.header_len += IPV4_BEET_PHMAXLEN; |
661 | if (x->encap) { |
662 | struct xfrm_encap_tmpl *encap = x->encap; |
663 | |
664 | switch (encap->encap_type) { |
665 | default: |
666 | goto error; |
667 | case UDP_ENCAP_ESPINUDP: |
668 | x->props.header_len += sizeof(struct udphdr); |
669 | break; |
670 | case UDP_ENCAP_ESPINUDP_NON_IKE: |
671 | x->props.header_len += sizeof(struct udphdr) + 2 * sizeof(u32); |
672 | break; |
673 | } |
674 | } |
675 | |
676 | align = ALIGN(crypto_aead_blocksize(aead), 4); |
677 | if (esp->padlen) |
678 | align = max_t(u32, align, esp->padlen); |
679 | x->props.trailer_len = align + 1 + crypto_aead_authsize(esp->aead); |
680 | |
681 | error: |
682 | return err; |
683 | } |
684 | |
685 | static const struct xfrm_type esp_type = |
686 | { |
687 | .description = "ESP4", |
688 | .owner = THIS_MODULE, |
689 | .proto = IPPROTO_ESP, |
690 | .flags = XFRM_TYPE_REPLAY_PROT, |
691 | .init_state = esp_init_state, |
692 | .destructor = esp_destroy, |
693 | .get_mtu = esp4_get_mtu, |
694 | .input = esp_input, |
695 | .output = esp_output |
696 | }; |
697 | |
698 | static const struct net_protocol esp4_protocol = { |
699 | .handler = xfrm4_rcv, |
700 | .err_handler = esp4_err, |
701 | .no_policy = 1, |
702 | .netns_ok = 1, |
703 | }; |
704 | |
705 | static int __init esp4_init(void) |
706 | { |
707 | if (xfrm_register_type(&esp_type, AF_INET) < 0) { |
708 | printk(KERN_INFO "ip esp init: can't add xfrm type\n"); |
709 | return -EAGAIN; |
710 | } |
711 | if (inet_add_protocol(&esp4_protocol, IPPROTO_ESP) < 0) { |
712 | printk(KERN_INFO "ip esp init: can't add protocol\n"); |
713 | xfrm_unregister_type(&esp_type, AF_INET); |
714 | return -EAGAIN; |
715 | } |
716 | return 0; |
717 | } |
718 | |
719 | static void __exit esp4_fini(void) |
720 | { |
721 | if (inet_del_protocol(&esp4_protocol, IPPROTO_ESP) < 0) |
722 | printk(KERN_INFO "ip esp close: can't remove protocol\n"); |
723 | if (xfrm_unregister_type(&esp_type, AF_INET) < 0) |
724 | printk(KERN_INFO "ip esp close: can't remove xfrm type\n"); |
725 | } |
726 | |
727 | module_init(esp4_init); |
728 | module_exit(esp4_fini); |
729 | MODULE_LICENSE("GPL"); |
730 | MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_ESP); |
731 |
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