Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Copyright (C)2002 USAGI/WIDE Project | |
1ab1457c | 3 | * |
1da177e4 LT |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
1ab1457c | 8 | * |
1da177e4 LT |
9 | * This program is distributed in the hope that it will be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
1ab1457c | 13 | * |
1da177e4 LT |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
17 | * | |
18 | * Authors | |
19 | * | |
1ab1457c | 20 | * Mitsuru KANDA @USAGI : IPv6 Support |
1da177e4 LT |
21 | * Kazunori MIYAZAWA @USAGI : |
22 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> | |
1ab1457c | 23 | * |
1da177e4 LT |
24 | * This file is derived from net/ipv4/ah.c. |
25 | */ | |
26 | ||
1da177e4 LT |
27 | #include <linux/module.h> |
28 | #include <net/ip.h> | |
29 | #include <net/ah.h> | |
30 | #include <linux/crypto.h> | |
31 | #include <linux/pfkeyv2.h> | |
b7c6538c | 32 | #include <linux/spinlock.h> |
1da177e4 LT |
33 | #include <linux/string.h> |
34 | #include <net/icmp.h> | |
35 | #include <net/ipv6.h> | |
14c85021 | 36 | #include <net/protocol.h> |
1da177e4 | 37 | #include <net/xfrm.h> |
1da177e4 LT |
38 | |
39 | static int zero_out_mutable_opts(struct ipv6_opt_hdr *opthdr) | |
40 | { | |
41 | u8 *opt = (u8 *)opthdr; | |
42 | int len = ipv6_optlen(opthdr); | |
43 | int off = 0; | |
44 | int optlen = 0; | |
45 | ||
46 | off += 2; | |
47 | len -= 2; | |
48 | ||
49 | while (len > 0) { | |
50 | ||
51 | switch (opt[off]) { | |
52 | ||
53 | case IPV6_TLV_PAD0: | |
54 | optlen = 1; | |
55 | break; | |
56 | default: | |
1ab1457c | 57 | if (len < 2) |
1da177e4 LT |
58 | goto bad; |
59 | optlen = opt[off+1]+2; | |
60 | if (len < optlen) | |
61 | goto bad; | |
62 | if (opt[off] & 0x20) | |
63 | memset(&opt[off+2], 0, opt[off+1]); | |
64 | break; | |
65 | } | |
66 | ||
67 | off += optlen; | |
68 | len -= optlen; | |
69 | } | |
70 | if (len == 0) | |
71 | return 1; | |
72 | ||
73 | bad: | |
74 | return 0; | |
75 | } | |
76 | ||
59fbb3a6 | 77 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
27637df9 MN |
78 | /** |
79 | * ipv6_rearrange_destopt - rearrange IPv6 destination options header | |
80 | * @iph: IPv6 header | |
81 | * @destopt: destionation options header | |
82 | */ | |
83 | static void ipv6_rearrange_destopt(struct ipv6hdr *iph, struct ipv6_opt_hdr *destopt) | |
84 | { | |
85 | u8 *opt = (u8 *)destopt; | |
86 | int len = ipv6_optlen(destopt); | |
87 | int off = 0; | |
88 | int optlen = 0; | |
89 | ||
90 | off += 2; | |
91 | len -= 2; | |
92 | ||
93 | while (len > 0) { | |
94 | ||
95 | switch (opt[off]) { | |
96 | ||
97 | case IPV6_TLV_PAD0: | |
98 | optlen = 1; | |
99 | break; | |
100 | default: | |
101 | if (len < 2) | |
102 | goto bad; | |
103 | optlen = opt[off+1]+2; | |
104 | if (len < optlen) | |
105 | goto bad; | |
106 | ||
107 | /* Rearrange the source address in @iph and the | |
108 | * addresses in home address option for final source. | |
109 | * See 11.3.2 of RFC 3775 for details. | |
110 | */ | |
111 | if (opt[off] == IPV6_TLV_HAO) { | |
112 | struct in6_addr final_addr; | |
113 | struct ipv6_destopt_hao *hao; | |
114 | ||
115 | hao = (struct ipv6_destopt_hao *)&opt[off]; | |
116 | if (hao->length != sizeof(hao->addr)) { | |
117 | if (net_ratelimit()) | |
118 | printk(KERN_WARNING "destopt hao: invalid header length: %u\n", hao->length); | |
119 | goto bad; | |
120 | } | |
121 | ipv6_addr_copy(&final_addr, &hao->addr); | |
122 | ipv6_addr_copy(&hao->addr, &iph->saddr); | |
123 | ipv6_addr_copy(&iph->saddr, &final_addr); | |
124 | } | |
125 | break; | |
126 | } | |
127 | ||
128 | off += optlen; | |
129 | len -= optlen; | |
130 | } | |
e731c248 | 131 | /* Note: ok if len == 0 */ |
27637df9 MN |
132 | bad: |
133 | return; | |
134 | } | |
136ebf08 MN |
135 | #else |
136 | static void ipv6_rearrange_destopt(struct ipv6hdr *iph, struct ipv6_opt_hdr *destopt) {} | |
27637df9 MN |
137 | #endif |
138 | ||
1da177e4 LT |
139 | /** |
140 | * ipv6_rearrange_rthdr - rearrange IPv6 routing header | |
141 | * @iph: IPv6 header | |
142 | * @rthdr: routing header | |
143 | * | |
144 | * Rearrange the destination address in @iph and the addresses in @rthdr | |
145 | * so that they appear in the order they will at the final destination. | |
146 | * See Appendix A2 of RFC 2402 for details. | |
147 | */ | |
148 | static void ipv6_rearrange_rthdr(struct ipv6hdr *iph, struct ipv6_rt_hdr *rthdr) | |
149 | { | |
150 | int segments, segments_left; | |
151 | struct in6_addr *addrs; | |
152 | struct in6_addr final_addr; | |
153 | ||
154 | segments_left = rthdr->segments_left; | |
155 | if (segments_left == 0) | |
156 | return; | |
1ab1457c | 157 | rthdr->segments_left = 0; |
1da177e4 LT |
158 | |
159 | /* The value of rthdr->hdrlen has been verified either by the system | |
160 | * call if it is locally generated, or by ipv6_rthdr_rcv() for incoming | |
161 | * packets. So we can assume that it is even and that segments is | |
162 | * greater than or equal to segments_left. | |
163 | * | |
164 | * For the same reason we can assume that this option is of type 0. | |
165 | */ | |
166 | segments = rthdr->hdrlen >> 1; | |
167 | ||
168 | addrs = ((struct rt0_hdr *)rthdr)->addr; | |
169 | ipv6_addr_copy(&final_addr, addrs + segments - 1); | |
170 | ||
171 | addrs += segments - segments_left; | |
172 | memmove(addrs + 1, addrs, (segments_left - 1) * sizeof(*addrs)); | |
173 | ||
174 | ipv6_addr_copy(addrs, &iph->daddr); | |
175 | ipv6_addr_copy(&iph->daddr, &final_addr); | |
176 | } | |
177 | ||
27637df9 | 178 | static int ipv6_clear_mutable_options(struct ipv6hdr *iph, int len, int dir) |
1da177e4 LT |
179 | { |
180 | union { | |
181 | struct ipv6hdr *iph; | |
182 | struct ipv6_opt_hdr *opth; | |
183 | struct ipv6_rt_hdr *rth; | |
184 | char *raw; | |
185 | } exthdr = { .iph = iph }; | |
186 | char *end = exthdr.raw + len; | |
187 | int nexthdr = iph->nexthdr; | |
188 | ||
189 | exthdr.iph++; | |
190 | ||
191 | while (exthdr.raw < end) { | |
192 | switch (nexthdr) { | |
27637df9 MN |
193 | case NEXTHDR_DEST: |
194 | if (dir == XFRM_POLICY_OUT) | |
195 | ipv6_rearrange_destopt(iph, exthdr.opth); | |
1da177e4 | 196 | case NEXTHDR_HOP: |
1da177e4 | 197 | if (!zero_out_mutable_opts(exthdr.opth)) { |
64ce2073 | 198 | LIMIT_NETDEBUG( |
1da177e4 LT |
199 | KERN_WARNING "overrun %sopts\n", |
200 | nexthdr == NEXTHDR_HOP ? | |
64ce2073 | 201 | "hop" : "dest"); |
1da177e4 LT |
202 | return -EINVAL; |
203 | } | |
204 | break; | |
205 | ||
206 | case NEXTHDR_ROUTING: | |
207 | ipv6_rearrange_rthdr(iph, exthdr.rth); | |
208 | break; | |
209 | ||
210 | default : | |
211 | return 0; | |
212 | } | |
213 | ||
214 | nexthdr = exthdr.opth->nexthdr; | |
215 | exthdr.raw += ipv6_optlen(exthdr.opth); | |
216 | } | |
217 | ||
218 | return 0; | |
219 | } | |
220 | ||
221 | static int ah6_output(struct xfrm_state *x, struct sk_buff *skb) | |
222 | { | |
223 | int err; | |
224 | int extlen; | |
225 | struct ipv6hdr *top_iph; | |
226 | struct ip_auth_hdr *ah; | |
227 | struct ah_data *ahp; | |
228 | u8 nexthdr; | |
229 | char tmp_base[8]; | |
230 | struct { | |
59fbb3a6 | 231 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
27637df9 MN |
232 | struct in6_addr saddr; |
233 | #endif | |
1da177e4 LT |
234 | struct in6_addr daddr; |
235 | char hdrs[0]; | |
236 | } *tmp_ext; | |
237 | ||
7b277b1a | 238 | skb_push(skb, -skb_network_offset(skb)); |
007f0211 | 239 | top_iph = ipv6_hdr(skb); |
1da177e4 LT |
240 | top_iph->payload_len = htons(skb->len - sizeof(*top_iph)); |
241 | ||
007f0211 HX |
242 | nexthdr = *skb_mac_header(skb); |
243 | *skb_mac_header(skb) = IPPROTO_AH; | |
1da177e4 LT |
244 | |
245 | /* When there are no extension headers, we only need to save the first | |
246 | * 8 bytes of the base IP header. | |
247 | */ | |
248 | memcpy(tmp_base, top_iph, sizeof(tmp_base)); | |
249 | ||
250 | tmp_ext = NULL; | |
144466bd | 251 | extlen = skb_transport_offset(skb) - sizeof(struct ipv6hdr); |
1da177e4 LT |
252 | if (extlen) { |
253 | extlen += sizeof(*tmp_ext); | |
254 | tmp_ext = kmalloc(extlen, GFP_ATOMIC); | |
255 | if (!tmp_ext) { | |
256 | err = -ENOMEM; | |
257 | goto error; | |
258 | } | |
59fbb3a6 | 259 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
27637df9 | 260 | memcpy(tmp_ext, &top_iph->saddr, extlen); |
27637df9 | 261 | #else |
1da177e4 | 262 | memcpy(tmp_ext, &top_iph->daddr, extlen); |
e731c248 | 263 | #endif |
1da177e4 LT |
264 | err = ipv6_clear_mutable_options(top_iph, |
265 | extlen - sizeof(*tmp_ext) + | |
e731c248 YH |
266 | sizeof(*top_iph), |
267 | XFRM_POLICY_OUT); | |
1da177e4 LT |
268 | if (err) |
269 | goto error_free_iph; | |
270 | } | |
271 | ||
87bdc48d | 272 | ah = ip_auth_hdr(skb); |
1da177e4 LT |
273 | ah->nexthdr = nexthdr; |
274 | ||
275 | top_iph->priority = 0; | |
276 | top_iph->flow_lbl[0] = 0; | |
277 | top_iph->flow_lbl[1] = 0; | |
278 | top_iph->flow_lbl[2] = 0; | |
279 | top_iph->hop_limit = 0; | |
280 | ||
281 | ahp = x->data; | |
87bdc48d | 282 | ah->hdrlen = (XFRM_ALIGN8(sizeof(*ah) + ahp->icv_trunc_len) >> 2) - 2; |
1da177e4 LT |
283 | |
284 | ah->reserved = 0; | |
285 | ah->spi = x->id.spi; | |
b318e0e4 | 286 | ah->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output); |
b7c6538c HX |
287 | |
288 | spin_lock_bh(&x->lock); | |
07d4ee58 | 289 | err = ah_mac_digest(ahp, skb, ah->auth_data); |
07d4ee58 | 290 | memcpy(ah->auth_data, ahp->work_icv, ahp->icv_trunc_len); |
b7c6538c | 291 | spin_unlock_bh(&x->lock); |
1da177e4 | 292 | |
b7c6538c HX |
293 | if (err) |
294 | goto error_free_iph; | |
1da177e4 LT |
295 | |
296 | memcpy(top_iph, tmp_base, sizeof(tmp_base)); | |
297 | if (tmp_ext) { | |
59fbb3a6 | 298 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
27637df9 MN |
299 | memcpy(&top_iph->saddr, tmp_ext, extlen); |
300 | #else | |
1da177e4 | 301 | memcpy(&top_iph->daddr, tmp_ext, extlen); |
27637df9 | 302 | #endif |
1da177e4 LT |
303 | error_free_iph: |
304 | kfree(tmp_ext); | |
305 | } | |
306 | ||
307 | error: | |
308 | return err; | |
309 | } | |
310 | ||
e695633e | 311 | static int ah6_input(struct xfrm_state *x, struct sk_buff *skb) |
1da177e4 LT |
312 | { |
313 | /* | |
314 | * Before process AH | |
315 | * [IPv6][Ext1][Ext2][AH][Dest][Payload] | |
316 | * |<-------------->| hdr_len | |
317 | * | |
318 | * To erase AH: | |
319 | * Keeping copy of cleared headers. After AH processing, | |
b0e380b1 ACM |
320 | * Moving the pointer of skb->network_header by using skb_pull as long |
321 | * as AH header length. Then copy back the copy as long as hdr_len | |
1da177e4 | 322 | * If destination header following AH exists, copy it into after [Ext2]. |
1ab1457c | 323 | * |
1da177e4 LT |
324 | * |<>|[IPv6][Ext1][Ext2][Dest][Payload] |
325 | * There is offset of AH before IPv6 header after the process. | |
326 | */ | |
327 | ||
87bdc48d | 328 | struct ip_auth_hdr *ah; |
0660e03f | 329 | struct ipv6hdr *ip6h; |
1da177e4 LT |
330 | struct ah_data *ahp; |
331 | unsigned char *tmp_hdr = NULL; | |
332 | u16 hdr_len; | |
333 | u16 ah_hlen; | |
334 | int nexthdr; | |
07d4ee58 | 335 | int err = -EINVAL; |
1da177e4 LT |
336 | |
337 | if (!pskb_may_pull(skb, sizeof(struct ip_auth_hdr))) | |
338 | goto out; | |
339 | ||
340 | /* We are going to _remove_ AH header to keep sockets happy, | |
341 | * so... Later this can change. */ | |
342 | if (skb_cloned(skb) && | |
343 | pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) | |
344 | goto out; | |
345 | ||
7aa68cb9 HX |
346 | skb->ip_summed = CHECKSUM_NONE; |
347 | ||
d56f90a7 | 348 | hdr_len = skb->data - skb_network_header(skb); |
87bdc48d | 349 | ah = (struct ip_auth_hdr *)skb->data; |
1da177e4 LT |
350 | ahp = x->data; |
351 | nexthdr = ah->nexthdr; | |
352 | ah_hlen = (ah->hdrlen + 2) << 2; | |
353 | ||
87bdc48d HX |
354 | if (ah_hlen != XFRM_ALIGN8(sizeof(*ah) + ahp->icv_full_len) && |
355 | ah_hlen != XFRM_ALIGN8(sizeof(*ah) + ahp->icv_trunc_len)) | |
1ab1457c | 356 | goto out; |
1da177e4 LT |
357 | |
358 | if (!pskb_may_pull(skb, ah_hlen)) | |
359 | goto out; | |
360 | ||
d56f90a7 | 361 | tmp_hdr = kmemdup(skb_network_header(skb), hdr_len, GFP_ATOMIC); |
1da177e4 LT |
362 | if (!tmp_hdr) |
363 | goto out; | |
0660e03f ACM |
364 | ip6h = ipv6_hdr(skb); |
365 | if (ipv6_clear_mutable_options(ip6h, hdr_len, XFRM_POLICY_IN)) | |
27637df9 | 366 | goto free_out; |
0660e03f ACM |
367 | ip6h->priority = 0; |
368 | ip6h->flow_lbl[0] = 0; | |
369 | ip6h->flow_lbl[1] = 0; | |
370 | ip6h->flow_lbl[2] = 0; | |
371 | ip6h->hop_limit = 0; | |
1da177e4 | 372 | |
0ebea8ef | 373 | spin_lock(&x->lock); |
1ab1457c | 374 | { |
1da177e4 LT |
375 | u8 auth_data[MAX_AH_AUTH_LEN]; |
376 | ||
377 | memcpy(auth_data, ah->auth_data, ahp->icv_trunc_len); | |
378 | memset(ah->auth_data, 0, ahp->icv_trunc_len); | |
31a4ab93 | 379 | skb_push(skb, hdr_len); |
07d4ee58 HX |
380 | err = ah_mac_digest(ahp, skb, ah->auth_data); |
381 | if (err) | |
0ebea8ef | 382 | goto unlock; |
9dd3245a | 383 | if (memcmp(ahp->work_icv, auth_data, ahp->icv_trunc_len)) |
668dc8af | 384 | err = -EBADMSG; |
1da177e4 | 385 | } |
0ebea8ef HX |
386 | unlock: |
387 | spin_unlock(&x->lock); | |
388 | ||
389 | if (err) | |
390 | goto free_out; | |
1da177e4 | 391 | |
b0e380b1 | 392 | skb->network_header += ah_hlen; |
d56f90a7 | 393 | memcpy(skb_network_header(skb), tmp_hdr, hdr_len); |
b0e380b1 | 394 | skb->transport_header = skb->network_header; |
31a4ab93 | 395 | __skb_pull(skb, ah_hlen + hdr_len); |
1da177e4 LT |
396 | |
397 | kfree(tmp_hdr); | |
398 | ||
399 | return nexthdr; | |
400 | ||
401 | free_out: | |
402 | kfree(tmp_hdr); | |
403 | out: | |
07d4ee58 | 404 | return err; |
1da177e4 LT |
405 | } |
406 | ||
1ab1457c | 407 | static void ah6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 408 | u8 type, u8 code, int offset, __be32 info) |
1da177e4 | 409 | { |
4fb236ba | 410 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
411 | struct ipv6hdr *iph = (struct ipv6hdr*)skb->data; |
412 | struct ip_auth_hdr *ah = (struct ip_auth_hdr*)(skb->data+offset); | |
413 | struct xfrm_state *x; | |
414 | ||
415 | if (type != ICMPV6_DEST_UNREACH && | |
416 | type != ICMPV6_PKT_TOOBIG) | |
417 | return; | |
418 | ||
4fb236ba | 419 | x = xfrm_state_lookup(net, (xfrm_address_t *)&iph->daddr, ah->spi, IPPROTO_AH, AF_INET6); |
1da177e4 LT |
420 | if (!x) |
421 | return; | |
422 | ||
5b095d98 | 423 | NETDEBUG(KERN_DEBUG "pmtu discovery on SA AH/%08x/%pI6\n", |
0c6ce78a | 424 | ntohl(ah->spi), &iph->daddr); |
1da177e4 LT |
425 | |
426 | xfrm_state_put(x); | |
427 | } | |
428 | ||
72cb6962 | 429 | static int ah6_init_state(struct xfrm_state *x) |
1da177e4 LT |
430 | { |
431 | struct ah_data *ahp = NULL; | |
432 | struct xfrm_algo_desc *aalg_desc; | |
07d4ee58 | 433 | struct crypto_hash *tfm; |
1da177e4 LT |
434 | |
435 | if (!x->aalg) | |
436 | goto error; | |
437 | ||
1da177e4 LT |
438 | if (x->encap) |
439 | goto error; | |
440 | ||
0c600eda | 441 | ahp = kzalloc(sizeof(*ahp), GFP_KERNEL); |
1da177e4 LT |
442 | if (ahp == NULL) |
443 | return -ENOMEM; | |
444 | ||
07d4ee58 HX |
445 | tfm = crypto_alloc_hash(x->aalg->alg_name, 0, CRYPTO_ALG_ASYNC); |
446 | if (IS_ERR(tfm)) | |
447 | goto error; | |
448 | ||
449 | ahp->tfm = tfm; | |
bc31d3b2 HX |
450 | if (crypto_hash_setkey(tfm, x->aalg->alg_key, |
451 | (x->aalg->alg_key_len + 7) / 8)) | |
1da177e4 | 452 | goto error; |
1ab1457c | 453 | |
1da177e4 LT |
454 | /* |
455 | * Lookup the algorithm description maintained by xfrm_algo, | |
456 | * verify crypto transform properties, and store information | |
457 | * we need for AH processing. This lookup cannot fail here | |
07d4ee58 | 458 | * after a successful crypto_alloc_hash(). |
1da177e4 LT |
459 | */ |
460 | aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0); | |
461 | BUG_ON(!aalg_desc); | |
462 | ||
463 | if (aalg_desc->uinfo.auth.icv_fullbits/8 != | |
07d4ee58 | 464 | crypto_hash_digestsize(tfm)) { |
1da177e4 | 465 | printk(KERN_INFO "AH: %s digestsize %u != %hu\n", |
07d4ee58 | 466 | x->aalg->alg_name, crypto_hash_digestsize(tfm), |
1da177e4 LT |
467 | aalg_desc->uinfo.auth.icv_fullbits/8); |
468 | goto error; | |
469 | } | |
1ab1457c | 470 | |
1da177e4 LT |
471 | ahp->icv_full_len = aalg_desc->uinfo.auth.icv_fullbits/8; |
472 | ahp->icv_trunc_len = aalg_desc->uinfo.auth.icv_truncbits/8; | |
1ab1457c | 473 | |
1da177e4 | 474 | BUG_ON(ahp->icv_trunc_len > MAX_AH_AUTH_LEN); |
1ab1457c | 475 | |
1da177e4 LT |
476 | ahp->work_icv = kmalloc(ahp->icv_full_len, GFP_KERNEL); |
477 | if (!ahp->work_icv) | |
478 | goto error; | |
1ab1457c | 479 | |
87bdc48d HX |
480 | x->props.header_len = XFRM_ALIGN8(sizeof(struct ip_auth_hdr) + |
481 | ahp->icv_trunc_len); | |
ca68145f HX |
482 | switch (x->props.mode) { |
483 | case XFRM_MODE_BEET: | |
484 | case XFRM_MODE_TRANSPORT: | |
485 | break; | |
486 | case XFRM_MODE_TUNNEL: | |
1da177e4 | 487 | x->props.header_len += sizeof(struct ipv6hdr); |
ea2c47b4 | 488 | break; |
ca68145f HX |
489 | default: |
490 | goto error; | |
491 | } | |
1da177e4 LT |
492 | x->data = ahp; |
493 | ||
494 | return 0; | |
495 | ||
496 | error: | |
497 | if (ahp) { | |
573dbd95 | 498 | kfree(ahp->work_icv); |
07d4ee58 | 499 | crypto_free_hash(ahp->tfm); |
1da177e4 LT |
500 | kfree(ahp); |
501 | } | |
502 | return -EINVAL; | |
503 | } | |
504 | ||
505 | static void ah6_destroy(struct xfrm_state *x) | |
506 | { | |
507 | struct ah_data *ahp = x->data; | |
508 | ||
509 | if (!ahp) | |
510 | return; | |
511 | ||
573dbd95 | 512 | kfree(ahp->work_icv); |
07d4ee58 | 513 | crypto_free_hash(ahp->tfm); |
1da177e4 LT |
514 | kfree(ahp); |
515 | } | |
516 | ||
533cb5b0 | 517 | static const struct xfrm_type ah6_type = |
1da177e4 LT |
518 | { |
519 | .description = "AH6", | |
520 | .owner = THIS_MODULE, | |
521 | .proto = IPPROTO_AH, | |
436a0a40 | 522 | .flags = XFRM_TYPE_REPLAY_PROT, |
1da177e4 LT |
523 | .init_state = ah6_init_state, |
524 | .destructor = ah6_destroy, | |
525 | .input = ah6_input, | |
aee5adb4 MN |
526 | .output = ah6_output, |
527 | .hdr_offset = xfrm6_find_1stfragopt, | |
1da177e4 LT |
528 | }; |
529 | ||
41135cc8 | 530 | static const struct inet6_protocol ah6_protocol = { |
1da177e4 LT |
531 | .handler = xfrm6_rcv, |
532 | .err_handler = ah6_err, | |
533 | .flags = INET6_PROTO_NOPOLICY, | |
534 | }; | |
535 | ||
536 | static int __init ah6_init(void) | |
537 | { | |
538 | if (xfrm_register_type(&ah6_type, AF_INET6) < 0) { | |
539 | printk(KERN_INFO "ipv6 ah init: can't add xfrm type\n"); | |
540 | return -EAGAIN; | |
541 | } | |
542 | ||
543 | if (inet6_add_protocol(&ah6_protocol, IPPROTO_AH) < 0) { | |
544 | printk(KERN_INFO "ipv6 ah init: can't add protocol\n"); | |
545 | xfrm_unregister_type(&ah6_type, AF_INET6); | |
546 | return -EAGAIN; | |
547 | } | |
548 | ||
549 | return 0; | |
550 | } | |
551 | ||
552 | static void __exit ah6_fini(void) | |
553 | { | |
554 | if (inet6_del_protocol(&ah6_protocol, IPPROTO_AH) < 0) | |
555 | printk(KERN_INFO "ipv6 ah close: can't remove protocol\n"); | |
556 | ||
557 | if (xfrm_unregister_type(&ah6_type, AF_INET6) < 0) | |
558 | printk(KERN_INFO "ipv6 ah close: can't remove xfrm type\n"); | |
559 | ||
560 | } | |
561 | ||
562 | module_init(ah6_init); | |
563 | module_exit(ah6_fini); | |
564 | ||
565 | MODULE_LICENSE("GPL"); | |
d3d6dd3a | 566 | MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_AH); |