Commit | Line | Data |
---|---|---|
38320c70 HX |
1 | #include <crypto/aead.h> |
2 | #include <crypto/authenc.h> | |
6b7326c8 | 3 | #include <linux/err.h> |
1da177e4 LT |
4 | #include <linux/module.h> |
5 | #include <net/ip.h> | |
6 | #include <net/xfrm.h> | |
7 | #include <net/esp.h> | |
72998d8c | 8 | #include <linux/scatterlist.h> |
a02a6422 | 9 | #include <linux/kernel.h> |
1da177e4 | 10 | #include <linux/pfkeyv2.h> |
38320c70 HX |
11 | #include <linux/rtnetlink.h> |
12 | #include <linux/slab.h> | |
b7c6538c | 13 | #include <linux/spinlock.h> |
2017a72c | 14 | #include <linux/in6.h> |
1da177e4 | 15 | #include <net/icmp.h> |
14c85021 | 16 | #include <net/protocol.h> |
1da177e4 LT |
17 | #include <net/udp.h> |
18 | ||
38320c70 HX |
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 | /* | |
27 | * Allocate an AEAD request structure with extra space for SG and IV. | |
28 | * | |
29 | * For alignment considerations the IV is placed at the front, followed | |
30 | * by the request and finally the SG list. | |
31 | * | |
32 | * TODO: Use spare space in skb for this where possible. | |
33 | */ | |
34 | static void *esp_alloc_tmp(struct crypto_aead *aead, int nfrags) | |
35 | { | |
36 | unsigned int len; | |
37 | ||
38 | len = crypto_aead_ivsize(aead); | |
39 | if (len) { | |
40 | len += crypto_aead_alignmask(aead) & | |
41 | ~(crypto_tfm_ctx_alignment() - 1); | |
42 | len = ALIGN(len, crypto_tfm_ctx_alignment()); | |
43 | } | |
44 | ||
45 | len += sizeof(struct aead_givcrypt_request) + crypto_aead_reqsize(aead); | |
46 | len = ALIGN(len, __alignof__(struct scatterlist)); | |
47 | ||
48 | len += sizeof(struct scatterlist) * nfrags; | |
49 | ||
50 | return kmalloc(len, GFP_ATOMIC); | |
51 | } | |
52 | ||
53 | static inline u8 *esp_tmp_iv(struct crypto_aead *aead, void *tmp) | |
54 | { | |
55 | return crypto_aead_ivsize(aead) ? | |
56 | PTR_ALIGN((u8 *)tmp, crypto_aead_alignmask(aead) + 1) : tmp; | |
57 | } | |
58 | ||
59 | static inline struct aead_givcrypt_request *esp_tmp_givreq( | |
60 | struct crypto_aead *aead, u8 *iv) | |
61 | { | |
62 | struct aead_givcrypt_request *req; | |
63 | ||
64 | req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead), | |
65 | crypto_tfm_ctx_alignment()); | |
66 | aead_givcrypt_set_tfm(req, aead); | |
67 | return req; | |
68 | } | |
69 | ||
70 | static inline struct aead_request *esp_tmp_req(struct crypto_aead *aead, u8 *iv) | |
71 | { | |
72 | struct aead_request *req; | |
73 | ||
74 | req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead), | |
75 | crypto_tfm_ctx_alignment()); | |
76 | aead_request_set_tfm(req, aead); | |
77 | return req; | |
78 | } | |
79 | ||
80 | static inline struct scatterlist *esp_req_sg(struct crypto_aead *aead, | |
81 | struct aead_request *req) | |
82 | { | |
83 | return (void *)ALIGN((unsigned long)(req + 1) + | |
84 | crypto_aead_reqsize(aead), | |
85 | __alignof__(struct scatterlist)); | |
86 | } | |
87 | ||
88 | static inline struct scatterlist *esp_givreq_sg( | |
89 | struct crypto_aead *aead, struct aead_givcrypt_request *req) | |
90 | { | |
91 | return (void *)ALIGN((unsigned long)(req + 1) + | |
92 | crypto_aead_reqsize(aead), | |
93 | __alignof__(struct scatterlist)); | |
94 | } | |
95 | ||
96 | static void esp_output_done(struct crypto_async_request *base, int err) | |
97 | { | |
98 | struct sk_buff *skb = base->data; | |
99 | ||
100 | kfree(ESP_SKB_CB(skb)->tmp); | |
101 | xfrm_output_resume(skb, err); | |
102 | } | |
103 | ||
1da177e4 LT |
104 | static int esp_output(struct xfrm_state *x, struct sk_buff *skb) |
105 | { | |
106 | int err; | |
1da177e4 | 107 | struct ip_esp_hdr *esph; |
38320c70 HX |
108 | struct crypto_aead *aead; |
109 | struct aead_givcrypt_request *req; | |
110 | struct scatterlist *sg; | |
111 | struct scatterlist *asg; | |
1da177e4 LT |
112 | struct esp_data *esp; |
113 | struct sk_buff *trailer; | |
38320c70 HX |
114 | void *tmp; |
115 | u8 *iv; | |
27a884dc | 116 | u8 *tail; |
1da177e4 LT |
117 | int blksize; |
118 | int clen; | |
119 | int alen; | |
120 | int nfrags; | |
121 | ||
7b277b1a | 122 | /* skb is pure payload to encrypt */ |
1da177e4 LT |
123 | |
124 | err = -ENOMEM; | |
125 | ||
126 | /* Round to block size */ | |
127 | clen = skb->len; | |
128 | ||
129 | esp = x->data; | |
38320c70 HX |
130 | aead = esp->aead; |
131 | alen = crypto_aead_authsize(aead); | |
132 | ||
133 | blksize = ALIGN(crypto_aead_blocksize(aead), 4); | |
a02a6422 | 134 | clen = ALIGN(clen + 2, blksize); |
38320c70 HX |
135 | if (esp->padlen) |
136 | clen = ALIGN(clen, esp->padlen); | |
137 | ||
138 | if ((err = skb_cow_data(skb, clen - skb->len + alen, &trailer)) < 0) | |
139 | goto error; | |
140 | nfrags = err; | |
1da177e4 | 141 | |
38320c70 HX |
142 | tmp = esp_alloc_tmp(aead, nfrags + 1); |
143 | if (!tmp) | |
1da177e4 LT |
144 | goto error; |
145 | ||
38320c70 HX |
146 | iv = esp_tmp_iv(aead, tmp); |
147 | req = esp_tmp_givreq(aead, iv); | |
148 | asg = esp_givreq_sg(aead, req); | |
149 | sg = asg + 1; | |
150 | ||
1da177e4 | 151 | /* Fill padding... */ |
27a884dc | 152 | tail = skb_tail_pointer(trailer); |
1da177e4 LT |
153 | do { |
154 | int i; | |
155 | for (i=0; i<clen-skb->len - 2; i++) | |
27a884dc | 156 | tail[i] = i + 1; |
1da177e4 | 157 | } while (0); |
27a884dc | 158 | tail[clen - skb->len - 2] = (clen - skb->len) - 2; |
38320c70 HX |
159 | tail[clen - skb->len - 1] = *skb_mac_header(skb); |
160 | pskb_put(skb, trailer, clen - skb->len + alen); | |
1da177e4 | 161 | |
7b277b1a | 162 | skb_push(skb, -skb_network_offset(skb)); |
87bdc48d | 163 | esph = ip_esp_hdr(skb); |
37fedd3a | 164 | *skb_mac_header(skb) = IPPROTO_ESP; |
1da177e4 LT |
165 | |
166 | /* this is non-NULL only with UDP Encapsulation */ | |
167 | if (x->encap) { | |
168 | struct xfrm_encap_tmpl *encap = x->encap; | |
169 | struct udphdr *uh; | |
d5a0a1e3 | 170 | __be32 *udpdata32; |
38320c70 HX |
171 | unsigned int sport, dport; |
172 | int encap_type; | |
173 | ||
174 | spin_lock_bh(&x->lock); | |
175 | sport = encap->encap_sport; | |
176 | dport = encap->encap_dport; | |
177 | encap_type = encap->encap_type; | |
178 | spin_unlock_bh(&x->lock); | |
1da177e4 LT |
179 | |
180 | uh = (struct udphdr *)esph; | |
38320c70 HX |
181 | uh->source = sport; |
182 | uh->dest = dport; | |
183 | uh->len = htons(skb->len - skb_transport_offset(skb)); | |
1da177e4 LT |
184 | uh->check = 0; |
185 | ||
38320c70 | 186 | switch (encap_type) { |
1da177e4 LT |
187 | default: |
188 | case UDP_ENCAP_ESPINUDP: | |
189 | esph = (struct ip_esp_hdr *)(uh + 1); | |
190 | break; | |
191 | case UDP_ENCAP_ESPINUDP_NON_IKE: | |
d5a0a1e3 | 192 | udpdata32 = (__be32 *)(uh + 1); |
1da177e4 LT |
193 | udpdata32[0] = udpdata32[1] = 0; |
194 | esph = (struct ip_esp_hdr *)(udpdata32 + 2); | |
195 | break; | |
196 | } | |
197 | ||
37fedd3a HX |
198 | *skb_mac_header(skb) = IPPROTO_UDP; |
199 | } | |
1da177e4 LT |
200 | |
201 | esph->spi = x->id.spi; | |
436a0a40 | 202 | esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq); |
1da177e4 | 203 | |
38320c70 HX |
204 | sg_init_table(sg, nfrags); |
205 | skb_to_sgvec(skb, sg, | |
206 | esph->enc_data + crypto_aead_ivsize(aead) - skb->data, | |
207 | clen + alen); | |
208 | sg_init_one(asg, esph, sizeof(*esph)); | |
209 | ||
210 | aead_givcrypt_set_callback(req, 0, esp_output_done, skb); | |
211 | aead_givcrypt_set_crypt(req, sg, sg, clen, iv); | |
212 | aead_givcrypt_set_assoc(req, asg, sizeof(*esph)); | |
213 | aead_givcrypt_set_giv(req, esph->enc_data, XFRM_SKB_CB(skb)->seq); | |
214 | ||
215 | ESP_SKB_CB(skb)->tmp = tmp; | |
216 | err = crypto_aead_givencrypt(req); | |
217 | if (err == -EINPROGRESS) | |
218 | goto error; | |
1da177e4 | 219 | |
38320c70 HX |
220 | if (err == -EBUSY) |
221 | err = NET_XMIT_DROP; | |
1da177e4 | 222 | |
38320c70 | 223 | kfree(tmp); |
b7c6538c | 224 | |
1da177e4 LT |
225 | error: |
226 | return err; | |
227 | } | |
228 | ||
38320c70 | 229 | static int esp_input_done2(struct sk_buff *skb, int err) |
1da177e4 LT |
230 | { |
231 | struct iphdr *iph; | |
38320c70 | 232 | struct xfrm_state *x = xfrm_input_state(skb); |
1da177e4 | 233 | struct esp_data *esp = x->data; |
38320c70 HX |
234 | struct crypto_aead *aead = esp->aead; |
235 | int alen = crypto_aead_authsize(aead); | |
236 | int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead); | |
237 | int elen = skb->len - hlen; | |
31a4ab93 | 238 | int ihl; |
4bf05ece | 239 | u8 nexthdr[2]; |
4bf05ece | 240 | int padlen; |
1da177e4 | 241 | |
38320c70 | 242 | kfree(ESP_SKB_CB(skb)->tmp); |
0ebea8ef | 243 | |
6b7326c8 | 244 | if (unlikely(err)) |
668dc8af | 245 | goto out; |
1da177e4 | 246 | |
4bf05ece HX |
247 | if (skb_copy_bits(skb, skb->len-alen-2, nexthdr, 2)) |
248 | BUG(); | |
1da177e4 | 249 | |
668dc8af | 250 | err = -EINVAL; |
4bf05ece | 251 | padlen = nexthdr[0]; |
38320c70 | 252 | if (padlen + 2 + alen >= elen) |
4bf05ece | 253 | goto out; |
1da177e4 | 254 | |
e905a9ed | 255 | /* ... check padding bits here. Silly. :-) */ |
1da177e4 | 256 | |
eddc9ec5 | 257 | iph = ip_hdr(skb); |
31a4ab93 HX |
258 | ihl = iph->ihl * 4; |
259 | ||
752c1f4c HX |
260 | if (x->encap) { |
261 | struct xfrm_encap_tmpl *encap = x->encap; | |
d56f90a7 | 262 | struct udphdr *uh = (void *)(skb_network_header(skb) + ihl); |
752c1f4c HX |
263 | |
264 | /* | |
265 | * 1) if the NAT-T peer's IP or port changed then | |
266 | * advertize the change to the keying daemon. | |
267 | * This is an inbound SA, so just compare | |
268 | * SRC ports. | |
269 | */ | |
270 | if (iph->saddr != x->props.saddr.a4 || | |
271 | uh->source != encap->encap_sport) { | |
272 | xfrm_address_t ipaddr; | |
273 | ||
274 | ipaddr.a4 = iph->saddr; | |
275 | km_new_mapping(x, &ipaddr, uh->source); | |
e905a9ed | 276 | |
752c1f4c HX |
277 | /* XXX: perhaps add an extra |
278 | * policy check here, to see | |
279 | * if we should allow or | |
280 | * reject a packet from a | |
281 | * different source | |
282 | * address/port. | |
283 | */ | |
1da177e4 | 284 | } |
e905a9ed | 285 | |
752c1f4c HX |
286 | /* |
287 | * 2) ignore UDP/TCP checksums in case | |
288 | * of NAT-T in Transport Mode, or | |
289 | * perform other post-processing fixes | |
290 | * as per draft-ietf-ipsec-udp-encaps-06, | |
291 | * section 3.1.2 | |
292 | */ | |
8bd17075 | 293 | if (x->props.mode == XFRM_MODE_TRANSPORT) |
752c1f4c | 294 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1da177e4 LT |
295 | } |
296 | ||
4bf05ece | 297 | pskb_trim(skb, skb->len - alen - padlen - 2); |
38320c70 | 298 | __skb_pull(skb, hlen); |
967b05f6 | 299 | skb_set_transport_header(skb, -ihl); |
4bf05ece | 300 | |
38320c70 HX |
301 | err = nexthdr[1]; |
302 | ||
303 | /* RFC4303: Drop dummy packets without any error */ | |
304 | if (err == IPPROTO_NONE) | |
305 | err = -EINVAL; | |
306 | ||
307 | out: | |
308 | return err; | |
309 | } | |
310 | ||
311 | static void esp_input_done(struct crypto_async_request *base, int err) | |
312 | { | |
313 | struct sk_buff *skb = base->data; | |
314 | ||
315 | xfrm_input_resume(skb, esp_input_done2(skb, err)); | |
316 | } | |
317 | ||
318 | /* | |
319 | * Note: detecting truncated vs. non-truncated authentication data is very | |
320 | * expensive, so we only support truncated data, which is the recommended | |
321 | * and common case. | |
322 | */ | |
323 | static int esp_input(struct xfrm_state *x, struct sk_buff *skb) | |
324 | { | |
325 | struct ip_esp_hdr *esph; | |
326 | struct esp_data *esp = x->data; | |
327 | struct crypto_aead *aead = esp->aead; | |
328 | struct aead_request *req; | |
329 | struct sk_buff *trailer; | |
330 | int elen = skb->len - sizeof(*esph) - crypto_aead_ivsize(aead); | |
331 | int nfrags; | |
332 | void *tmp; | |
333 | u8 *iv; | |
334 | struct scatterlist *sg; | |
335 | struct scatterlist *asg; | |
336 | int err = -EINVAL; | |
337 | ||
338 | if (!pskb_may_pull(skb, sizeof(*esph))) | |
339 | goto out; | |
340 | ||
341 | if (elen <= 0) | |
342 | goto out; | |
343 | ||
344 | if ((err = skb_cow_data(skb, 0, &trailer)) < 0) | |
345 | goto out; | |
346 | nfrags = err; | |
347 | ||
348 | err = -ENOMEM; | |
349 | tmp = esp_alloc_tmp(aead, nfrags + 1); | |
350 | if (!tmp) | |
351 | goto out; | |
352 | ||
353 | ESP_SKB_CB(skb)->tmp = tmp; | |
354 | iv = esp_tmp_iv(aead, tmp); | |
355 | req = esp_tmp_req(aead, iv); | |
356 | asg = esp_req_sg(aead, req); | |
357 | sg = asg + 1; | |
358 | ||
359 | skb->ip_summed = CHECKSUM_NONE; | |
360 | ||
361 | esph = (struct ip_esp_hdr *)skb->data; | |
362 | ||
363 | /* Get ivec. This can be wrong, check against another impls. */ | |
364 | iv = esph->enc_data; | |
365 | ||
366 | sg_init_table(sg, nfrags); | |
367 | skb_to_sgvec(skb, sg, sizeof(*esph) + crypto_aead_ivsize(aead), elen); | |
368 | sg_init_one(asg, esph, sizeof(*esph)); | |
369 | ||
370 | aead_request_set_callback(req, 0, esp_input_done, skb); | |
371 | aead_request_set_crypt(req, sg, sg, elen, iv); | |
372 | aead_request_set_assoc(req, asg, sizeof(*esph)); | |
373 | ||
374 | err = crypto_aead_decrypt(req); | |
375 | if (err == -EINPROGRESS) | |
376 | goto out; | |
377 | ||
378 | err = esp_input_done2(skb, err); | |
1da177e4 LT |
379 | |
380 | out: | |
668dc8af | 381 | return err; |
1da177e4 LT |
382 | } |
383 | ||
c5c25238 | 384 | static u32 esp4_get_mtu(struct xfrm_state *x, int mtu) |
1da177e4 LT |
385 | { |
386 | struct esp_data *esp = x->data; | |
38320c70 HX |
387 | u32 blksize = ALIGN(crypto_aead_blocksize(esp->aead), 4); |
388 | u32 align = max_t(u32, blksize, esp->padlen); | |
c5c25238 PM |
389 | u32 rem; |
390 | ||
38320c70 | 391 | mtu -= x->props.header_len + crypto_aead_authsize(esp->aead); |
c5c25238 PM |
392 | rem = mtu & (align - 1); |
393 | mtu &= ~(align - 1); | |
0a69452c DB |
394 | |
395 | switch (x->props.mode) { | |
396 | case XFRM_MODE_TUNNEL: | |
0a69452c DB |
397 | break; |
398 | default: | |
399 | case XFRM_MODE_TRANSPORT: | |
400 | /* The worst case */ | |
c5c25238 PM |
401 | mtu -= blksize - 4; |
402 | mtu += min_t(u32, blksize - 4, rem); | |
0a69452c DB |
403 | break; |
404 | case XFRM_MODE_BEET: | |
e905a9ed | 405 | /* The worst case. */ |
c5c25238 | 406 | mtu += min_t(u32, IPV4_BEET_PHMAXLEN, rem); |
0a69452c | 407 | break; |
1da177e4 | 408 | } |
0a69452c | 409 | |
c5c25238 | 410 | return mtu - 2; |
1da177e4 LT |
411 | } |
412 | ||
413 | static void esp4_err(struct sk_buff *skb, u32 info) | |
414 | { | |
415 | struct iphdr *iph = (struct iphdr*)skb->data; | |
416 | struct ip_esp_hdr *esph = (struct ip_esp_hdr*)(skb->data+(iph->ihl<<2)); | |
417 | struct xfrm_state *x; | |
418 | ||
88c7664f ACM |
419 | if (icmp_hdr(skb)->type != ICMP_DEST_UNREACH || |
420 | icmp_hdr(skb)->code != ICMP_FRAG_NEEDED) | |
1da177e4 LT |
421 | return; |
422 | ||
423 | x = xfrm_state_lookup((xfrm_address_t *)&iph->daddr, esph->spi, IPPROTO_ESP, AF_INET); | |
424 | if (!x) | |
425 | return; | |
64ce2073 PM |
426 | NETDEBUG(KERN_DEBUG "pmtu discovery on SA ESP/%08x/%08x\n", |
427 | ntohl(esph->spi), ntohl(iph->daddr)); | |
1da177e4 LT |
428 | xfrm_state_put(x); |
429 | } | |
430 | ||
431 | static void esp_destroy(struct xfrm_state *x) | |
432 | { | |
433 | struct esp_data *esp = x->data; | |
434 | ||
435 | if (!esp) | |
436 | return; | |
437 | ||
38320c70 | 438 | crypto_free_aead(esp->aead); |
1da177e4 LT |
439 | kfree(esp); |
440 | } | |
441 | ||
1a6509d9 | 442 | static int esp_init_aead(struct xfrm_state *x) |
1da177e4 | 443 | { |
1a6509d9 HX |
444 | struct esp_data *esp = x->data; |
445 | struct crypto_aead *aead; | |
446 | int err; | |
447 | ||
448 | aead = crypto_alloc_aead(x->aead->alg_name, 0, 0); | |
449 | err = PTR_ERR(aead); | |
450 | if (IS_ERR(aead)) | |
451 | goto error; | |
452 | ||
453 | esp->aead = aead; | |
454 | ||
455 | err = crypto_aead_setkey(aead, x->aead->alg_key, | |
456 | (x->aead->alg_key_len + 7) / 8); | |
457 | if (err) | |
458 | goto error; | |
459 | ||
460 | err = crypto_aead_setauthsize(aead, x->aead->alg_icv_len / 8); | |
461 | if (err) | |
462 | goto error; | |
463 | ||
464 | error: | |
465 | return err; | |
466 | } | |
467 | ||
468 | static int esp_init_authenc(struct xfrm_state *x) | |
469 | { | |
470 | struct esp_data *esp = x->data; | |
38320c70 HX |
471 | struct crypto_aead *aead; |
472 | struct crypto_authenc_key_param *param; | |
473 | struct rtattr *rta; | |
474 | char *key; | |
475 | char *p; | |
476 | char authenc_name[CRYPTO_MAX_ALG_NAME]; | |
38320c70 HX |
477 | unsigned int keylen; |
478 | int err; | |
1da177e4 | 479 | |
1a6509d9 | 480 | err = -EINVAL; |
1da177e4 | 481 | if (x->ealg == NULL) |
1a6509d9 | 482 | goto error; |
38320c70 | 483 | |
1a6509d9 | 484 | err = -ENAMETOOLONG; |
38320c70 HX |
485 | if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME, "authenc(%s,%s)", |
486 | x->aalg ? x->aalg->alg_name : "digest_null", | |
487 | x->ealg->alg_name) >= CRYPTO_MAX_ALG_NAME) | |
1a6509d9 | 488 | goto error; |
38320c70 HX |
489 | |
490 | aead = crypto_alloc_aead(authenc_name, 0, 0); | |
491 | err = PTR_ERR(aead); | |
492 | if (IS_ERR(aead)) | |
493 | goto error; | |
494 | ||
495 | esp->aead = aead; | |
496 | ||
497 | keylen = (x->aalg ? (x->aalg->alg_key_len + 7) / 8 : 0) + | |
498 | (x->ealg->alg_key_len + 7) / 8 + RTA_SPACE(sizeof(*param)); | |
499 | err = -ENOMEM; | |
500 | key = kmalloc(keylen, GFP_KERNEL); | |
501 | if (!key) | |
502 | goto error; | |
503 | ||
504 | p = key; | |
505 | rta = (void *)p; | |
506 | rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM; | |
507 | rta->rta_len = RTA_LENGTH(sizeof(*param)); | |
508 | param = RTA_DATA(rta); | |
509 | p += RTA_SPACE(sizeof(*param)); | |
510 | ||
1da177e4 LT |
511 | if (x->aalg) { |
512 | struct xfrm_algo_desc *aalg_desc; | |
513 | ||
38320c70 HX |
514 | memcpy(p, x->aalg->alg_key, (x->aalg->alg_key_len + 7) / 8); |
515 | p += (x->aalg->alg_key_len + 7) / 8; | |
1da177e4 LT |
516 | |
517 | aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0); | |
518 | BUG_ON(!aalg_desc); | |
519 | ||
38320c70 | 520 | err = -EINVAL; |
1da177e4 | 521 | if (aalg_desc->uinfo.auth.icv_fullbits/8 != |
38320c70 | 522 | crypto_aead_authsize(aead)) { |
64ce2073 PM |
523 | NETDEBUG(KERN_INFO "ESP: %s digestsize %u != %hu\n", |
524 | x->aalg->alg_name, | |
38320c70 | 525 | crypto_aead_authsize(aead), |
64ce2073 | 526 | aalg_desc->uinfo.auth.icv_fullbits/8); |
38320c70 | 527 | goto free_key; |
1da177e4 LT |
528 | } |
529 | ||
38320c70 HX |
530 | err = crypto_aead_setauthsize( |
531 | aead, aalg_desc->uinfo.auth.icv_truncbits / 8); | |
532 | if (err) | |
533 | goto free_key; | |
1da177e4 | 534 | } |
4b7137ff | 535 | |
38320c70 HX |
536 | param->enckeylen = cpu_to_be32((x->ealg->alg_key_len + 7) / 8); |
537 | memcpy(p, x->ealg->alg_key, (x->ealg->alg_key_len + 7) / 8); | |
538 | ||
539 | err = crypto_aead_setkey(aead, key, keylen); | |
540 | ||
541 | free_key: | |
542 | kfree(key); | |
543 | ||
1a6509d9 HX |
544 | error: |
545 | return err; | |
546 | } | |
547 | ||
548 | static int esp_init_state(struct xfrm_state *x) | |
549 | { | |
550 | struct esp_data *esp; | |
551 | struct crypto_aead *aead; | |
552 | u32 align; | |
553 | int err; | |
554 | ||
555 | esp = kzalloc(sizeof(*esp), GFP_KERNEL); | |
556 | if (esp == NULL) | |
557 | return -ENOMEM; | |
558 | ||
559 | x->data = esp; | |
560 | ||
561 | if (x->aead) | |
562 | err = esp_init_aead(x); | |
563 | else | |
564 | err = esp_init_authenc(x); | |
565 | ||
38320c70 | 566 | if (err) |
1da177e4 | 567 | goto error; |
38320c70 | 568 | |
1a6509d9 HX |
569 | aead = esp->aead; |
570 | ||
571 | esp->padlen = 0; | |
572 | ||
38320c70 HX |
573 | x->props.header_len = sizeof(struct ip_esp_hdr) + |
574 | crypto_aead_ivsize(aead); | |
7e49e6de | 575 | if (x->props.mode == XFRM_MODE_TUNNEL) |
1da177e4 | 576 | x->props.header_len += sizeof(struct iphdr); |
ac758e3c PM |
577 | else if (x->props.mode == XFRM_MODE_BEET) |
578 | x->props.header_len += IPV4_BEET_PHMAXLEN; | |
1da177e4 LT |
579 | if (x->encap) { |
580 | struct xfrm_encap_tmpl *encap = x->encap; | |
581 | ||
582 | switch (encap->encap_type) { | |
583 | default: | |
584 | goto error; | |
585 | case UDP_ENCAP_ESPINUDP: | |
586 | x->props.header_len += sizeof(struct udphdr); | |
587 | break; | |
588 | case UDP_ENCAP_ESPINUDP_NON_IKE: | |
589 | x->props.header_len += sizeof(struct udphdr) + 2 * sizeof(u32); | |
590 | break; | |
591 | } | |
592 | } | |
38320c70 HX |
593 | |
594 | align = ALIGN(crypto_aead_blocksize(aead), 4); | |
595 | if (esp->padlen) | |
596 | align = max_t(u32, align, esp->padlen); | |
597 | x->props.trailer_len = align + 1 + crypto_aead_authsize(esp->aead); | |
1da177e4 LT |
598 | |
599 | error: | |
38320c70 | 600 | return err; |
1da177e4 LT |
601 | } |
602 | ||
603 | static struct xfrm_type esp_type = | |
604 | { | |
605 | .description = "ESP4", | |
606 | .owner = THIS_MODULE, | |
607 | .proto = IPPROTO_ESP, | |
436a0a40 | 608 | .flags = XFRM_TYPE_REPLAY_PROT, |
1da177e4 LT |
609 | .init_state = esp_init_state, |
610 | .destructor = esp_destroy, | |
c5c25238 | 611 | .get_mtu = esp4_get_mtu, |
1da177e4 | 612 | .input = esp_input, |
1da177e4 LT |
613 | .output = esp_output |
614 | }; | |
615 | ||
616 | static struct net_protocol esp4_protocol = { | |
617 | .handler = xfrm4_rcv, | |
618 | .err_handler = esp4_err, | |
619 | .no_policy = 1, | |
620 | }; | |
621 | ||
622 | static int __init esp4_init(void) | |
623 | { | |
1da177e4 LT |
624 | if (xfrm_register_type(&esp_type, AF_INET) < 0) { |
625 | printk(KERN_INFO "ip esp init: can't add xfrm type\n"); | |
626 | return -EAGAIN; | |
627 | } | |
628 | if (inet_add_protocol(&esp4_protocol, IPPROTO_ESP) < 0) { | |
629 | printk(KERN_INFO "ip esp init: can't add protocol\n"); | |
630 | xfrm_unregister_type(&esp_type, AF_INET); | |
631 | return -EAGAIN; | |
632 | } | |
633 | return 0; | |
634 | } | |
635 | ||
636 | static void __exit esp4_fini(void) | |
637 | { | |
638 | if (inet_del_protocol(&esp4_protocol, IPPROTO_ESP) < 0) | |
639 | printk(KERN_INFO "ip esp close: can't remove protocol\n"); | |
640 | if (xfrm_unregister_type(&esp_type, AF_INET) < 0) | |
641 | printk(KERN_INFO "ip esp close: can't remove xfrm type\n"); | |
642 | } | |
643 | ||
644 | module_init(esp4_init); | |
645 | module_exit(esp4_fini); | |
646 | MODULE_LICENSE("GPL"); | |
d3d6dd3a | 647 | MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_ESP); |