Blame view
net/ipv4/esp4.c
16.7 KB
38320c70d
|
1 2 |
#include <crypto/aead.h> #include <crypto/authenc.h> |
6b7326c84
|
3 |
#include <linux/err.h> |
1da177e4c
|
4 5 6 7 |
#include <linux/module.h> #include <net/ip.h> #include <net/xfrm.h> #include <net/esp.h> |
72998d8c8
|
8 |
#include <linux/scatterlist.h> |
a02a64223
|
9 |
#include <linux/kernel.h> |
1da177e4c
|
10 |
#include <linux/pfkeyv2.h> |
38320c70d
|
11 12 |
#include <linux/rtnetlink.h> #include <linux/slab.h> |
b7c6538cd
|
13 |
#include <linux/spinlock.h> |
2017a72c0
|
14 |
#include <linux/in6.h> |
1da177e4c
|
15 |
#include <net/icmp.h> |
14c850212
|
16 |
#include <net/protocol.h> |
1da177e4c
|
17 |
#include <net/udp.h> |
38320c70d
|
18 19 20 21 22 23 |
struct esp_skb_cb { struct xfrm_skb_cb xfrm; void *tmp; }; #define ESP_SKB_CB(__skb) ((struct esp_skb_cb *)&((__skb)->cb[0])) |
d979e20f2
|
24 |
static u32 esp4_get_mtu(struct xfrm_state *x, int mtu); |
38320c70d
|
25 26 27 28 29 30 31 32 |
/* * Allocate an AEAD request structure with extra space for SG and IV. * * For alignment considerations the IV is placed at the front, followed * by the request and finally the SG list. * * TODO: Use spare space in skb for this where possible. */ |
0dc49e9b2
|
33 |
static void *esp_alloc_tmp(struct crypto_aead *aead, int nfrags, int seqhilen) |
38320c70d
|
34 35 |
{ unsigned int len; |
0dc49e9b2
|
36 37 38 |
len = seqhilen; len += crypto_aead_ivsize(aead); |
38320c70d
|
39 40 41 42 43 44 45 46 47 48 49 50 51 |
if (len) { len += crypto_aead_alignmask(aead) & ~(crypto_tfm_ctx_alignment() - 1); len = ALIGN(len, crypto_tfm_ctx_alignment()); } len += sizeof(struct aead_givcrypt_request) + crypto_aead_reqsize(aead); len = ALIGN(len, __alignof__(struct scatterlist)); len += sizeof(struct scatterlist) * nfrags; return kmalloc(len, GFP_ATOMIC); } |
0dc49e9b2
|
52 53 54 55 56 |
static inline __be32 *esp_tmp_seqhi(void *tmp) { return PTR_ALIGN((__be32 *)tmp, __alignof__(__be32)); } static inline u8 *esp_tmp_iv(struct crypto_aead *aead, void *tmp, int seqhilen) |
38320c70d
|
57 58 |
{ return crypto_aead_ivsize(aead) ? |
0dc49e9b2
|
59 60 |
PTR_ALIGN((u8 *)tmp + seqhilen, crypto_aead_alignmask(aead) + 1) : tmp + seqhilen; |
38320c70d
|
61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 |
} static inline struct aead_givcrypt_request *esp_tmp_givreq( struct crypto_aead *aead, u8 *iv) { struct aead_givcrypt_request *req; req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead), crypto_tfm_ctx_alignment()); aead_givcrypt_set_tfm(req, aead); return req; } static inline struct aead_request *esp_tmp_req(struct crypto_aead *aead, u8 *iv) { struct aead_request *req; req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead), crypto_tfm_ctx_alignment()); aead_request_set_tfm(req, aead); return req; } static inline struct scatterlist *esp_req_sg(struct crypto_aead *aead, struct aead_request *req) { return (void *)ALIGN((unsigned long)(req + 1) + crypto_aead_reqsize(aead), __alignof__(struct scatterlist)); } static inline struct scatterlist *esp_givreq_sg( struct crypto_aead *aead, struct aead_givcrypt_request *req) { return (void *)ALIGN((unsigned long)(req + 1) + crypto_aead_reqsize(aead), __alignof__(struct scatterlist)); } static void esp_output_done(struct crypto_async_request *base, int err) { struct sk_buff *skb = base->data; kfree(ESP_SKB_CB(skb)->tmp); xfrm_output_resume(skb, err); } |
1da177e4c
|
107 108 109 |
static int esp_output(struct xfrm_state *x, struct sk_buff *skb) { int err; |
1da177e4c
|
110 |
struct ip_esp_hdr *esph; |
38320c70d
|
111 112 113 114 |
struct crypto_aead *aead; struct aead_givcrypt_request *req; struct scatterlist *sg; struct scatterlist *asg; |
1da177e4c
|
115 116 |
struct esp_data *esp; struct sk_buff *trailer; |
38320c70d
|
117 118 |
void *tmp; u8 *iv; |
27a884dc3
|
119 |
u8 *tail; |
1da177e4c
|
120 121 122 |
int blksize; int clen; int alen; |
d979e20f2
|
123 124 |
int plen; int tfclen; |
1da177e4c
|
125 |
int nfrags; |
0dc49e9b2
|
126 127 128 129 |
int assoclen; int sglists; int seqhilen; __be32 *seqhi; |
1da177e4c
|
130 |
|
7b277b1a5
|
131 |
/* skb is pure payload to encrypt */ |
1da177e4c
|
132 133 |
err = -ENOMEM; |
1da177e4c
|
134 |
esp = x->data; |
38320c70d
|
135 136 |
aead = esp->aead; alen = crypto_aead_authsize(aead); |
d979e20f2
|
137 138 139 140 141 142 143 144 145 |
tfclen = 0; if (x->tfcpad) { struct xfrm_dst *dst = (struct xfrm_dst *)skb_dst(skb); u32 padto; padto = min(x->tfcpad, esp4_get_mtu(x, dst->child_mtu_cached)); if (skb->len < padto) tfclen = padto - skb->len; } |
38320c70d
|
146 |
blksize = ALIGN(crypto_aead_blocksize(aead), 4); |
d979e20f2
|
147 |
clen = ALIGN(skb->len + 2 + tfclen, blksize); |
38320c70d
|
148 149 |
if (esp->padlen) clen = ALIGN(clen, esp->padlen); |
d979e20f2
|
150 |
plen = clen - skb->len - tfclen; |
38320c70d
|
151 |
|
d979e20f2
|
152 153 |
err = skb_cow_data(skb, tfclen + plen + alen, &trailer); if (err < 0) |
38320c70d
|
154 155 |
goto error; nfrags = err; |
1da177e4c
|
156 |
|
0dc49e9b2
|
157 158 159 160 161 162 163 164 165 166 167 |
assoclen = sizeof(*esph); sglists = 1; seqhilen = 0; if (x->props.flags & XFRM_STATE_ESN) { sglists += 2; seqhilen += sizeof(__be32); assoclen += seqhilen; } tmp = esp_alloc_tmp(aead, nfrags + sglists, seqhilen); |
38320c70d
|
168 |
if (!tmp) |
1da177e4c
|
169 |
goto error; |
0dc49e9b2
|
170 171 |
seqhi = esp_tmp_seqhi(tmp); iv = esp_tmp_iv(aead, tmp, seqhilen); |
38320c70d
|
172 173 |
req = esp_tmp_givreq(aead, iv); asg = esp_givreq_sg(aead, req); |
0dc49e9b2
|
174 |
sg = asg + sglists; |
38320c70d
|
175 |
|
1da177e4c
|
176 |
/* Fill padding... */ |
27a884dc3
|
177 |
tail = skb_tail_pointer(trailer); |
d979e20f2
|
178 179 180 181 |
if (tfclen) { memset(tail, 0, tfclen); tail += tfclen; } |
1da177e4c
|
182 183 |
do { int i; |
d979e20f2
|
184 |
for (i = 0; i < plen - 2; i++) |
27a884dc3
|
185 |
tail[i] = i + 1; |
1da177e4c
|
186 |
} while (0); |
d979e20f2
|
187 188 |
tail[plen - 2] = plen - 2; tail[plen - 1] = *skb_mac_header(skb); |
38320c70d
|
189 |
pskb_put(skb, trailer, clen - skb->len + alen); |
1da177e4c
|
190 |
|
7b277b1a5
|
191 |
skb_push(skb, -skb_network_offset(skb)); |
87bdc48d3
|
192 |
esph = ip_esp_hdr(skb); |
37fedd3aa
|
193 |
*skb_mac_header(skb) = IPPROTO_ESP; |
1da177e4c
|
194 195 196 197 198 |
/* this is non-NULL only with UDP Encapsulation */ if (x->encap) { struct xfrm_encap_tmpl *encap = x->encap; struct udphdr *uh; |
d5a0a1e31
|
199 |
__be32 *udpdata32; |
5e226e4d9
|
200 |
__be16 sport, dport; |
38320c70d
|
201 202 203 204 205 206 207 |
int encap_type; spin_lock_bh(&x->lock); sport = encap->encap_sport; dport = encap->encap_dport; encap_type = encap->encap_type; spin_unlock_bh(&x->lock); |
1da177e4c
|
208 209 |
uh = (struct udphdr *)esph; |
38320c70d
|
210 211 212 |
uh->source = sport; uh->dest = dport; uh->len = htons(skb->len - skb_transport_offset(skb)); |
1da177e4c
|
213 |
uh->check = 0; |
38320c70d
|
214 |
switch (encap_type) { |
1da177e4c
|
215 216 217 218 219 |
default: case UDP_ENCAP_ESPINUDP: esph = (struct ip_esp_hdr *)(uh + 1); break; case UDP_ENCAP_ESPINUDP_NON_IKE: |
d5a0a1e31
|
220 |
udpdata32 = (__be32 *)(uh + 1); |
1da177e4c
|
221 222 223 224 |
udpdata32[0] = udpdata32[1] = 0; esph = (struct ip_esp_hdr *)(udpdata32 + 2); break; } |
37fedd3aa
|
225 226 |
*skb_mac_header(skb) = IPPROTO_UDP; } |
1da177e4c
|
227 228 |
esph->spi = x->id.spi; |
1ce3644ad
|
229 |
esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low); |
1da177e4c
|
230 |
|
38320c70d
|
231 232 233 234 |
sg_init_table(sg, nfrags); skb_to_sgvec(skb, sg, esph->enc_data + crypto_aead_ivsize(aead) - skb->data, clen + alen); |
0dc49e9b2
|
235 236 237 238 239 240 241 242 243 |
if ((x->props.flags & XFRM_STATE_ESN)) { sg_init_table(asg, 3); sg_set_buf(asg, &esph->spi, sizeof(__be32)); *seqhi = htonl(XFRM_SKB_CB(skb)->seq.output.hi); sg_set_buf(asg + 1, seqhi, seqhilen); sg_set_buf(asg + 2, &esph->seq_no, sizeof(__be32)); } else sg_init_one(asg, esph, sizeof(*esph)); |
38320c70d
|
244 245 246 |
aead_givcrypt_set_callback(req, 0, esp_output_done, skb); aead_givcrypt_set_crypt(req, sg, sg, clen, iv); |
0dc49e9b2
|
247 |
aead_givcrypt_set_assoc(req, asg, assoclen); |
b318e0e4e
|
248 |
aead_givcrypt_set_giv(req, esph->enc_data, |
1ce3644ad
|
249 |
XFRM_SKB_CB(skb)->seq.output.low); |
38320c70d
|
250 251 252 253 254 |
ESP_SKB_CB(skb)->tmp = tmp; err = crypto_aead_givencrypt(req); if (err == -EINPROGRESS) goto error; |
1da177e4c
|
255 |
|
38320c70d
|
256 257 |
if (err == -EBUSY) err = NET_XMIT_DROP; |
1da177e4c
|
258 |
|
38320c70d
|
259 |
kfree(tmp); |
b7c6538cd
|
260 |
|
1da177e4c
|
261 262 263 |
error: return err; } |
38320c70d
|
264 |
static int esp_input_done2(struct sk_buff *skb, int err) |
1da177e4c
|
265 |
{ |
b71d1d426
|
266 |
const struct iphdr *iph; |
38320c70d
|
267 |
struct xfrm_state *x = xfrm_input_state(skb); |
1da177e4c
|
268 |
struct esp_data *esp = x->data; |
38320c70d
|
269 270 271 272 |
struct crypto_aead *aead = esp->aead; int alen = crypto_aead_authsize(aead); int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead); int elen = skb->len - hlen; |
31a4ab930
|
273 |
int ihl; |
4bf05ecee
|
274 |
u8 nexthdr[2]; |
4bf05ecee
|
275 |
int padlen; |
1da177e4c
|
276 |
|
38320c70d
|
277 |
kfree(ESP_SKB_CB(skb)->tmp); |
0ebea8ef3
|
278 |
|
6b7326c84
|
279 |
if (unlikely(err)) |
668dc8af3
|
280 |
goto out; |
1da177e4c
|
281 |
|
4bf05ecee
|
282 283 |
if (skb_copy_bits(skb, skb->len-alen-2, nexthdr, 2)) BUG(); |
1da177e4c
|
284 |
|
668dc8af3
|
285 |
err = -EINVAL; |
4bf05ecee
|
286 |
padlen = nexthdr[0]; |
38320c70d
|
287 |
if (padlen + 2 + alen >= elen) |
4bf05ecee
|
288 |
goto out; |
1da177e4c
|
289 |
|
e905a9eda
|
290 |
/* ... check padding bits here. Silly. :-) */ |
1da177e4c
|
291 |
|
eddc9ec53
|
292 |
iph = ip_hdr(skb); |
31a4ab930
|
293 |
ihl = iph->ihl * 4; |
752c1f4c7
|
294 295 |
if (x->encap) { struct xfrm_encap_tmpl *encap = x->encap; |
d56f90a7c
|
296 |
struct udphdr *uh = (void *)(skb_network_header(skb) + ihl); |
752c1f4c7
|
297 298 299 300 301 302 303 304 305 306 307 308 309 |
/* * 1) if the NAT-T peer's IP or port changed then * advertize the change to the keying daemon. * This is an inbound SA, so just compare * SRC ports. */ if (iph->saddr != x->props.saddr.a4 || uh->source != encap->encap_sport) { xfrm_address_t ipaddr; ipaddr.a4 = iph->saddr; km_new_mapping(x, &ipaddr, uh->source); |
e905a9eda
|
310 |
|
752c1f4c7
|
311 312 313 314 315 316 317 |
/* XXX: perhaps add an extra * policy check here, to see * if we should allow or * reject a packet from a * different source * address/port. */ |
1da177e4c
|
318 |
} |
e905a9eda
|
319 |
|
752c1f4c7
|
320 321 322 323 324 325 326 |
/* * 2) ignore UDP/TCP checksums in case * of NAT-T in Transport Mode, or * perform other post-processing fixes * as per draft-ietf-ipsec-udp-encaps-06, * section 3.1.2 */ |
8bd170750
|
327 |
if (x->props.mode == XFRM_MODE_TRANSPORT) |
752c1f4c7
|
328 |
skb->ip_summed = CHECKSUM_UNNECESSARY; |
1da177e4c
|
329 |
} |
4bf05ecee
|
330 |
pskb_trim(skb, skb->len - alen - padlen - 2); |
38320c70d
|
331 |
__skb_pull(skb, hlen); |
967b05f64
|
332 |
skb_set_transport_header(skb, -ihl); |
4bf05ecee
|
333 |
|
38320c70d
|
334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 |
err = nexthdr[1]; /* RFC4303: Drop dummy packets without any error */ if (err == IPPROTO_NONE) err = -EINVAL; out: return err; } static void esp_input_done(struct crypto_async_request *base, int err) { struct sk_buff *skb = base->data; xfrm_input_resume(skb, esp_input_done2(skb, err)); } /* * Note: detecting truncated vs. non-truncated authentication data is very * expensive, so we only support truncated data, which is the recommended * and common case. */ static int esp_input(struct xfrm_state *x, struct sk_buff *skb) { struct ip_esp_hdr *esph; struct esp_data *esp = x->data; struct crypto_aead *aead = esp->aead; struct aead_request *req; struct sk_buff *trailer; int elen = skb->len - sizeof(*esph) - crypto_aead_ivsize(aead); int nfrags; |
0dc49e9b2
|
365 366 367 368 |
int assoclen; int sglists; int seqhilen; __be32 *seqhi; |
38320c70d
|
369 370 371 372 373 |
void *tmp; u8 *iv; struct scatterlist *sg; struct scatterlist *asg; int err = -EINVAL; |
920fc941a
|
374 |
if (!pskb_may_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead))) |
38320c70d
|
375 376 377 378 379 380 381 382 |
goto out; if (elen <= 0) goto out; if ((err = skb_cow_data(skb, 0, &trailer)) < 0) goto out; nfrags = err; |
0dc49e9b2
|
383 384 385 386 387 388 389 390 391 |
assoclen = sizeof(*esph); sglists = 1; seqhilen = 0; if (x->props.flags & XFRM_STATE_ESN) { sglists += 2; seqhilen += sizeof(__be32); assoclen += seqhilen; } |
38320c70d
|
392 |
err = -ENOMEM; |
0dc49e9b2
|
393 |
tmp = esp_alloc_tmp(aead, nfrags + sglists, seqhilen); |
38320c70d
|
394 395 396 397 |
if (!tmp) goto out; ESP_SKB_CB(skb)->tmp = tmp; |
0dc49e9b2
|
398 399 |
seqhi = esp_tmp_seqhi(tmp); iv = esp_tmp_iv(aead, tmp, seqhilen); |
38320c70d
|
400 401 |
req = esp_tmp_req(aead, iv); asg = esp_req_sg(aead, req); |
0dc49e9b2
|
402 |
sg = asg + sglists; |
38320c70d
|
403 404 405 406 407 408 409 410 411 412 |
skb->ip_summed = CHECKSUM_NONE; esph = (struct ip_esp_hdr *)skb->data; /* Get ivec. This can be wrong, check against another impls. */ iv = esph->enc_data; sg_init_table(sg, nfrags); skb_to_sgvec(skb, sg, sizeof(*esph) + crypto_aead_ivsize(aead), elen); |
0dc49e9b2
|
413 414 415 416 417 418 419 420 421 |
if ((x->props.flags & XFRM_STATE_ESN)) { sg_init_table(asg, 3); sg_set_buf(asg, &esph->spi, sizeof(__be32)); *seqhi = XFRM_SKB_CB(skb)->seq.input.hi; sg_set_buf(asg + 1, seqhi, seqhilen); sg_set_buf(asg + 2, &esph->seq_no, sizeof(__be32)); } else sg_init_one(asg, esph, sizeof(*esph)); |
38320c70d
|
422 423 424 |
aead_request_set_callback(req, 0, esp_input_done, skb); aead_request_set_crypt(req, sg, sg, elen, iv); |
0dc49e9b2
|
425 |
aead_request_set_assoc(req, asg, assoclen); |
38320c70d
|
426 427 428 429 430 431 |
err = crypto_aead_decrypt(req); if (err == -EINPROGRESS) goto out; err = esp_input_done2(skb, err); |
1da177e4c
|
432 433 |
out: |
668dc8af3
|
434 |
return err; |
1da177e4c
|
435 |
} |
c5c252389
|
436 |
static u32 esp4_get_mtu(struct xfrm_state *x, int mtu) |
1da177e4c
|
437 438 |
{ struct esp_data *esp = x->data; |
38320c70d
|
439 440 |
u32 blksize = ALIGN(crypto_aead_blocksize(esp->aead), 4); u32 align = max_t(u32, blksize, esp->padlen); |
c5c252389
|
441 |
u32 rem; |
38320c70d
|
442 |
mtu -= x->props.header_len + crypto_aead_authsize(esp->aead); |
c5c252389
|
443 444 |
rem = mtu & (align - 1); mtu &= ~(align - 1); |
0a69452cb
|
445 446 447 |
switch (x->props.mode) { case XFRM_MODE_TUNNEL: |
0a69452cb
|
448 449 450 451 |
break; default: case XFRM_MODE_TRANSPORT: /* The worst case */ |
c5c252389
|
452 453 |
mtu -= blksize - 4; mtu += min_t(u32, blksize - 4, rem); |
0a69452cb
|
454 455 |
break; case XFRM_MODE_BEET: |
e905a9eda
|
456 |
/* The worst case. */ |
c5c252389
|
457 |
mtu += min_t(u32, IPV4_BEET_PHMAXLEN, rem); |
0a69452cb
|
458 |
break; |
1da177e4c
|
459 |
} |
0a69452cb
|
460 |
|
c5c252389
|
461 |
return mtu - 2; |
1da177e4c
|
462 463 464 465 |
} static void esp4_err(struct sk_buff *skb, u32 info) { |
4fb236bac
|
466 |
struct net *net = dev_net(skb->dev); |
b71d1d426
|
467 |
const struct iphdr *iph = (const struct iphdr *)skb->data; |
d9319100c
|
468 |
struct ip_esp_hdr *esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2)); |
1da177e4c
|
469 |
struct xfrm_state *x; |
88c7664f1
|
470 471 |
if (icmp_hdr(skb)->type != ICMP_DEST_UNREACH || icmp_hdr(skb)->code != ICMP_FRAG_NEEDED) |
1da177e4c
|
472 |
return; |
b71d1d426
|
473 474 |
x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr, esph->spi, IPPROTO_ESP, AF_INET); |
1da177e4c
|
475 476 |
if (!x) return; |
64ce20730
|
477 478 479 |
NETDEBUG(KERN_DEBUG "pmtu discovery on SA ESP/%08x/%08x ", ntohl(esph->spi), ntohl(iph->daddr)); |
1da177e4c
|
480 481 482 483 484 485 486 487 488 |
xfrm_state_put(x); } static void esp_destroy(struct xfrm_state *x) { struct esp_data *esp = x->data; if (!esp) return; |
38320c70d
|
489 |
crypto_free_aead(esp->aead); |
1da177e4c
|
490 491 |
kfree(esp); } |
1a6509d99
|
492 |
static int esp_init_aead(struct xfrm_state *x) |
1da177e4c
|
493 |
{ |
1a6509d99
|
494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 |
struct esp_data *esp = x->data; struct crypto_aead *aead; int err; aead = crypto_alloc_aead(x->aead->alg_name, 0, 0); err = PTR_ERR(aead); if (IS_ERR(aead)) goto error; esp->aead = aead; err = crypto_aead_setkey(aead, x->aead->alg_key, (x->aead->alg_key_len + 7) / 8); if (err) goto error; err = crypto_aead_setauthsize(aead, x->aead->alg_icv_len / 8); if (err) goto error; error: return err; } static int esp_init_authenc(struct xfrm_state *x) { struct esp_data *esp = x->data; |
38320c70d
|
521 522 523 524 525 526 |
struct crypto_aead *aead; struct crypto_authenc_key_param *param; struct rtattr *rta; char *key; char *p; char authenc_name[CRYPTO_MAX_ALG_NAME]; |
38320c70d
|
527 528 |
unsigned int keylen; int err; |
1da177e4c
|
529 |
|
1a6509d99
|
530 |
err = -EINVAL; |
1da177e4c
|
531 |
if (x->ealg == NULL) |
1a6509d99
|
532 |
goto error; |
38320c70d
|
533 |
|
1a6509d99
|
534 |
err = -ENAMETOOLONG; |
0dc49e9b2
|
535 536 537 538 539 540 541 542 543 544 545 546 547 548 |
if ((x->props.flags & XFRM_STATE_ESN)) { if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME, "authencesn(%s,%s)", x->aalg ? x->aalg->alg_name : "digest_null", x->ealg->alg_name) >= CRYPTO_MAX_ALG_NAME) goto error; } else { if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME, "authenc(%s,%s)", x->aalg ? x->aalg->alg_name : "digest_null", x->ealg->alg_name) >= CRYPTO_MAX_ALG_NAME) goto error; } |
38320c70d
|
549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 |
aead = crypto_alloc_aead(authenc_name, 0, 0); err = PTR_ERR(aead); if (IS_ERR(aead)) goto error; esp->aead = aead; keylen = (x->aalg ? (x->aalg->alg_key_len + 7) / 8 : 0) + (x->ealg->alg_key_len + 7) / 8 + RTA_SPACE(sizeof(*param)); err = -ENOMEM; key = kmalloc(keylen, GFP_KERNEL); if (!key) goto error; p = key; rta = (void *)p; rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM; rta->rta_len = RTA_LENGTH(sizeof(*param)); param = RTA_DATA(rta); p += RTA_SPACE(sizeof(*param)); |
1da177e4c
|
570 571 |
if (x->aalg) { struct xfrm_algo_desc *aalg_desc; |
38320c70d
|
572 573 |
memcpy(p, x->aalg->alg_key, (x->aalg->alg_key_len + 7) / 8); p += (x->aalg->alg_key_len + 7) / 8; |
1da177e4c
|
574 575 576 |
aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0); BUG_ON(!aalg_desc); |
38320c70d
|
577 |
err = -EINVAL; |
1da177e4c
|
578 |
if (aalg_desc->uinfo.auth.icv_fullbits/8 != |
38320c70d
|
579 |
crypto_aead_authsize(aead)) { |
64ce20730
|
580 581 582 |
NETDEBUG(KERN_INFO "ESP: %s digestsize %u != %hu ", x->aalg->alg_name, |
38320c70d
|
583 |
crypto_aead_authsize(aead), |
64ce20730
|
584 |
aalg_desc->uinfo.auth.icv_fullbits/8); |
38320c70d
|
585 |
goto free_key; |
1da177e4c
|
586 |
} |
38320c70d
|
587 |
err = crypto_aead_setauthsize( |
8f8a088c2
|
588 |
aead, x->aalg->alg_trunc_len / 8); |
38320c70d
|
589 590 |
if (err) goto free_key; |
1da177e4c
|
591 |
} |
4b7137ff8
|
592 |
|
38320c70d
|
593 594 595 596 597 598 599 |
param->enckeylen = cpu_to_be32((x->ealg->alg_key_len + 7) / 8); memcpy(p, x->ealg->alg_key, (x->ealg->alg_key_len + 7) / 8); err = crypto_aead_setkey(aead, key, keylen); free_key: kfree(key); |
1a6509d99
|
600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 |
error: return err; } static int esp_init_state(struct xfrm_state *x) { struct esp_data *esp; struct crypto_aead *aead; u32 align; int err; esp = kzalloc(sizeof(*esp), GFP_KERNEL); if (esp == NULL) return -ENOMEM; x->data = esp; if (x->aead) err = esp_init_aead(x); else err = esp_init_authenc(x); |
38320c70d
|
621 |
if (err) |
1da177e4c
|
622 |
goto error; |
38320c70d
|
623 |
|
1a6509d99
|
624 625 626 |
aead = esp->aead; esp->padlen = 0; |
38320c70d
|
627 628 |
x->props.header_len = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead); |
7e49e6de3
|
629 |
if (x->props.mode == XFRM_MODE_TUNNEL) |
1da177e4c
|
630 |
x->props.header_len += sizeof(struct iphdr); |
eb49e6309
|
631 |
else if (x->props.mode == XFRM_MODE_BEET && x->sel.family != AF_INET6) |
ac758e3c5
|
632 |
x->props.header_len += IPV4_BEET_PHMAXLEN; |
1da177e4c
|
633 634 635 636 637 638 639 640 641 642 643 644 645 646 |
if (x->encap) { struct xfrm_encap_tmpl *encap = x->encap; switch (encap->encap_type) { default: goto error; case UDP_ENCAP_ESPINUDP: x->props.header_len += sizeof(struct udphdr); break; case UDP_ENCAP_ESPINUDP_NON_IKE: x->props.header_len += sizeof(struct udphdr) + 2 * sizeof(u32); break; } } |
38320c70d
|
647 648 649 650 651 |
align = ALIGN(crypto_aead_blocksize(aead), 4); if (esp->padlen) align = max_t(u32, align, esp->padlen); x->props.trailer_len = align + 1 + crypto_aead_authsize(esp->aead); |
1da177e4c
|
652 653 |
error: |
38320c70d
|
654 |
return err; |
1da177e4c
|
655 |
} |
533cb5b0a
|
656 |
static const struct xfrm_type esp_type = |
1da177e4c
|
657 658 659 660 |
{ .description = "ESP4", .owner = THIS_MODULE, .proto = IPPROTO_ESP, |
436a0a402
|
661 |
.flags = XFRM_TYPE_REPLAY_PROT, |
1da177e4c
|
662 663 |
.init_state = esp_init_state, .destructor = esp_destroy, |
c5c252389
|
664 |
.get_mtu = esp4_get_mtu, |
1da177e4c
|
665 |
.input = esp_input, |
1da177e4c
|
666 667 |
.output = esp_output }; |
32613090a
|
668 |
static const struct net_protocol esp4_protocol = { |
1da177e4c
|
669 670 671 |
.handler = xfrm4_rcv, .err_handler = esp4_err, .no_policy = 1, |
4fb236bac
|
672 |
.netns_ok = 1, |
1da177e4c
|
673 674 675 676 |
}; static int __init esp4_init(void) { |
1da177e4c
|
677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 |
if (xfrm_register_type(&esp_type, AF_INET) < 0) { printk(KERN_INFO "ip esp init: can't add xfrm type "); return -EAGAIN; } if (inet_add_protocol(&esp4_protocol, IPPROTO_ESP) < 0) { printk(KERN_INFO "ip esp init: can't add protocol "); xfrm_unregister_type(&esp_type, AF_INET); return -EAGAIN; } return 0; } static void __exit esp4_fini(void) { if (inet_del_protocol(&esp4_protocol, IPPROTO_ESP) < 0) printk(KERN_INFO "ip esp close: can't remove protocol "); if (xfrm_unregister_type(&esp_type, AF_INET) < 0) printk(KERN_INFO "ip esp close: can't remove xfrm type "); } module_init(esp4_init); module_exit(esp4_fini); MODULE_LICENSE("GPL"); |
d3d6dd3ad
|
704 |
MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_ESP); |