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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 LT |
37 | #include <net/xfrm.h> |
38 | #include <asm/scatterlist.h> | |
39 | ||
40 | static int zero_out_mutable_opts(struct ipv6_opt_hdr *opthdr) | |
41 | { | |
42 | u8 *opt = (u8 *)opthdr; | |
43 | int len = ipv6_optlen(opthdr); | |
44 | int off = 0; | |
45 | int optlen = 0; | |
46 | ||
47 | off += 2; | |
48 | len -= 2; | |
49 | ||
50 | while (len > 0) { | |
51 | ||
52 | switch (opt[off]) { | |
53 | ||
54 | case IPV6_TLV_PAD0: | |
55 | optlen = 1; | |
56 | break; | |
57 | default: | |
1ab1457c | 58 | if (len < 2) |
1da177e4 LT |
59 | goto bad; |
60 | optlen = opt[off+1]+2; | |
61 | if (len < optlen) | |
62 | goto bad; | |
63 | if (opt[off] & 0x20) | |
64 | memset(&opt[off+2], 0, opt[off+1]); | |
65 | break; | |
66 | } | |
67 | ||
68 | off += optlen; | |
69 | len -= optlen; | |
70 | } | |
71 | if (len == 0) | |
72 | return 1; | |
73 | ||
74 | bad: | |
75 | return 0; | |
76 | } | |
77 | ||
59fbb3a6 | 78 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
27637df9 MN |
79 | /** |
80 | * ipv6_rearrange_destopt - rearrange IPv6 destination options header | |
81 | * @iph: IPv6 header | |
82 | * @destopt: destionation options header | |
83 | */ | |
84 | static void ipv6_rearrange_destopt(struct ipv6hdr *iph, struct ipv6_opt_hdr *destopt) | |
85 | { | |
86 | u8 *opt = (u8 *)destopt; | |
87 | int len = ipv6_optlen(destopt); | |
88 | int off = 0; | |
89 | int optlen = 0; | |
90 | ||
91 | off += 2; | |
92 | len -= 2; | |
93 | ||
94 | while (len > 0) { | |
95 | ||
96 | switch (opt[off]) { | |
97 | ||
98 | case IPV6_TLV_PAD0: | |
99 | optlen = 1; | |
100 | break; | |
101 | default: | |
102 | if (len < 2) | |
103 | goto bad; | |
104 | optlen = opt[off+1]+2; | |
105 | if (len < optlen) | |
106 | goto bad; | |
107 | ||
108 | /* Rearrange the source address in @iph and the | |
109 | * addresses in home address option for final source. | |
110 | * See 11.3.2 of RFC 3775 for details. | |
111 | */ | |
112 | if (opt[off] == IPV6_TLV_HAO) { | |
113 | struct in6_addr final_addr; | |
114 | struct ipv6_destopt_hao *hao; | |
115 | ||
116 | hao = (struct ipv6_destopt_hao *)&opt[off]; | |
117 | if (hao->length != sizeof(hao->addr)) { | |
118 | if (net_ratelimit()) | |
119 | printk(KERN_WARNING "destopt hao: invalid header length: %u\n", hao->length); | |
120 | goto bad; | |
121 | } | |
122 | ipv6_addr_copy(&final_addr, &hao->addr); | |
123 | ipv6_addr_copy(&hao->addr, &iph->saddr); | |
124 | ipv6_addr_copy(&iph->saddr, &final_addr); | |
125 | } | |
126 | break; | |
127 | } | |
128 | ||
129 | off += optlen; | |
130 | len -= optlen; | |
131 | } | |
e731c248 | 132 | /* Note: ok if len == 0 */ |
27637df9 MN |
133 | bad: |
134 | return; | |
135 | } | |
136ebf08 MN |
136 | #else |
137 | static void ipv6_rearrange_destopt(struct ipv6hdr *iph, struct ipv6_opt_hdr *destopt) {} | |
27637df9 MN |
138 | #endif |
139 | ||
1da177e4 LT |
140 | /** |
141 | * ipv6_rearrange_rthdr - rearrange IPv6 routing header | |
142 | * @iph: IPv6 header | |
143 | * @rthdr: routing header | |
144 | * | |
145 | * Rearrange the destination address in @iph and the addresses in @rthdr | |
146 | * so that they appear in the order they will at the final destination. | |
147 | * See Appendix A2 of RFC 2402 for details. | |
148 | */ | |
149 | static void ipv6_rearrange_rthdr(struct ipv6hdr *iph, struct ipv6_rt_hdr *rthdr) | |
150 | { | |
151 | int segments, segments_left; | |
152 | struct in6_addr *addrs; | |
153 | struct in6_addr final_addr; | |
154 | ||
155 | segments_left = rthdr->segments_left; | |
156 | if (segments_left == 0) | |
157 | return; | |
1ab1457c | 158 | rthdr->segments_left = 0; |
1da177e4 LT |
159 | |
160 | /* The value of rthdr->hdrlen has been verified either by the system | |
161 | * call if it is locally generated, or by ipv6_rthdr_rcv() for incoming | |
162 | * packets. So we can assume that it is even and that segments is | |
163 | * greater than or equal to segments_left. | |
164 | * | |
165 | * For the same reason we can assume that this option is of type 0. | |
166 | */ | |
167 | segments = rthdr->hdrlen >> 1; | |
168 | ||
169 | addrs = ((struct rt0_hdr *)rthdr)->addr; | |
170 | ipv6_addr_copy(&final_addr, addrs + segments - 1); | |
171 | ||
172 | addrs += segments - segments_left; | |
173 | memmove(addrs + 1, addrs, (segments_left - 1) * sizeof(*addrs)); | |
174 | ||
175 | ipv6_addr_copy(addrs, &iph->daddr); | |
176 | ipv6_addr_copy(&iph->daddr, &final_addr); | |
177 | } | |
178 | ||
27637df9 | 179 | static int ipv6_clear_mutable_options(struct ipv6hdr *iph, int len, int dir) |
1da177e4 LT |
180 | { |
181 | union { | |
182 | struct ipv6hdr *iph; | |
183 | struct ipv6_opt_hdr *opth; | |
184 | struct ipv6_rt_hdr *rth; | |
185 | char *raw; | |
186 | } exthdr = { .iph = iph }; | |
187 | char *end = exthdr.raw + len; | |
188 | int nexthdr = iph->nexthdr; | |
189 | ||
190 | exthdr.iph++; | |
191 | ||
192 | while (exthdr.raw < end) { | |
193 | switch (nexthdr) { | |
27637df9 MN |
194 | case NEXTHDR_DEST: |
195 | if (dir == XFRM_POLICY_OUT) | |
196 | ipv6_rearrange_destopt(iph, exthdr.opth); | |
1da177e4 | 197 | case NEXTHDR_HOP: |
1da177e4 | 198 | if (!zero_out_mutable_opts(exthdr.opth)) { |
64ce2073 | 199 | LIMIT_NETDEBUG( |
1da177e4 LT |
200 | KERN_WARNING "overrun %sopts\n", |
201 | nexthdr == NEXTHDR_HOP ? | |
64ce2073 | 202 | "hop" : "dest"); |
1da177e4 LT |
203 | return -EINVAL; |
204 | } | |
205 | break; | |
206 | ||
207 | case NEXTHDR_ROUTING: | |
208 | ipv6_rearrange_rthdr(iph, exthdr.rth); | |
209 | break; | |
210 | ||
211 | default : | |
212 | return 0; | |
213 | } | |
214 | ||
215 | nexthdr = exthdr.opth->nexthdr; | |
216 | exthdr.raw += ipv6_optlen(exthdr.opth); | |
217 | } | |
218 | ||
219 | return 0; | |
220 | } | |
221 | ||
222 | static int ah6_output(struct xfrm_state *x, struct sk_buff *skb) | |
223 | { | |
224 | int err; | |
225 | int extlen; | |
226 | struct ipv6hdr *top_iph; | |
227 | struct ip_auth_hdr *ah; | |
228 | struct ah_data *ahp; | |
229 | u8 nexthdr; | |
230 | char tmp_base[8]; | |
231 | struct { | |
59fbb3a6 | 232 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
27637df9 MN |
233 | struct in6_addr saddr; |
234 | #endif | |
1da177e4 LT |
235 | struct in6_addr daddr; |
236 | char hdrs[0]; | |
237 | } *tmp_ext; | |
238 | ||
7b277b1a | 239 | skb_push(skb, -skb_network_offset(skb)); |
007f0211 | 240 | top_iph = ipv6_hdr(skb); |
1da177e4 LT |
241 | top_iph->payload_len = htons(skb->len - sizeof(*top_iph)); |
242 | ||
007f0211 HX |
243 | nexthdr = *skb_mac_header(skb); |
244 | *skb_mac_header(skb) = IPPROTO_AH; | |
1da177e4 LT |
245 | |
246 | /* When there are no extension headers, we only need to save the first | |
247 | * 8 bytes of the base IP header. | |
248 | */ | |
249 | memcpy(tmp_base, top_iph, sizeof(tmp_base)); | |
250 | ||
251 | tmp_ext = NULL; | |
144466bd | 252 | extlen = skb_transport_offset(skb) - sizeof(struct ipv6hdr); |
1da177e4 LT |
253 | if (extlen) { |
254 | extlen += sizeof(*tmp_ext); | |
255 | tmp_ext = kmalloc(extlen, GFP_ATOMIC); | |
256 | if (!tmp_ext) { | |
257 | err = -ENOMEM; | |
258 | goto error; | |
259 | } | |
59fbb3a6 | 260 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
27637df9 | 261 | memcpy(tmp_ext, &top_iph->saddr, extlen); |
27637df9 | 262 | #else |
1da177e4 | 263 | memcpy(tmp_ext, &top_iph->daddr, extlen); |
e731c248 | 264 | #endif |
1da177e4 LT |
265 | err = ipv6_clear_mutable_options(top_iph, |
266 | extlen - sizeof(*tmp_ext) + | |
e731c248 YH |
267 | sizeof(*top_iph), |
268 | XFRM_POLICY_OUT); | |
1da177e4 LT |
269 | if (err) |
270 | goto error_free_iph; | |
271 | } | |
272 | ||
87bdc48d | 273 | ah = ip_auth_hdr(skb); |
1da177e4 LT |
274 | ah->nexthdr = nexthdr; |
275 | ||
276 | top_iph->priority = 0; | |
277 | top_iph->flow_lbl[0] = 0; | |
278 | top_iph->flow_lbl[1] = 0; | |
279 | top_iph->flow_lbl[2] = 0; | |
280 | top_iph->hop_limit = 0; | |
281 | ||
282 | ahp = x->data; | |
87bdc48d | 283 | ah->hdrlen = (XFRM_ALIGN8(sizeof(*ah) + ahp->icv_trunc_len) >> 2) - 2; |
1da177e4 LT |
284 | |
285 | ah->reserved = 0; | |
286 | ah->spi = x->id.spi; | |
436a0a40 | 287 | ah->seq_no = htonl(XFRM_SKB_CB(skb)->seq); |
b7c6538c HX |
288 | |
289 | spin_lock_bh(&x->lock); | |
07d4ee58 | 290 | err = ah_mac_digest(ahp, skb, ah->auth_data); |
07d4ee58 | 291 | memcpy(ah->auth_data, ahp->work_icv, ahp->icv_trunc_len); |
b7c6538c | 292 | spin_unlock_bh(&x->lock); |
1da177e4 | 293 | |
b7c6538c HX |
294 | if (err) |
295 | goto error_free_iph; | |
1da177e4 LT |
296 | |
297 | memcpy(top_iph, tmp_base, sizeof(tmp_base)); | |
298 | if (tmp_ext) { | |
59fbb3a6 | 299 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
27637df9 MN |
300 | memcpy(&top_iph->saddr, tmp_ext, extlen); |
301 | #else | |
1da177e4 | 302 | memcpy(&top_iph->daddr, tmp_ext, extlen); |
27637df9 | 303 | #endif |
1da177e4 LT |
304 | error_free_iph: |
305 | kfree(tmp_ext); | |
306 | } | |
307 | ||
308 | error: | |
309 | return err; | |
310 | } | |
311 | ||
e695633e | 312 | static int ah6_input(struct xfrm_state *x, struct sk_buff *skb) |
1da177e4 LT |
313 | { |
314 | /* | |
315 | * Before process AH | |
316 | * [IPv6][Ext1][Ext2][AH][Dest][Payload] | |
317 | * |<-------------->| hdr_len | |
318 | * | |
319 | * To erase AH: | |
320 | * Keeping copy of cleared headers. After AH processing, | |
b0e380b1 ACM |
321 | * Moving the pointer of skb->network_header by using skb_pull as long |
322 | * as AH header length. Then copy back the copy as long as hdr_len | |
1da177e4 | 323 | * If destination header following AH exists, copy it into after [Ext2]. |
1ab1457c | 324 | * |
1da177e4 LT |
325 | * |<>|[IPv6][Ext1][Ext2][Dest][Payload] |
326 | * There is offset of AH before IPv6 header after the process. | |
327 | */ | |
328 | ||
87bdc48d | 329 | struct ip_auth_hdr *ah; |
0660e03f | 330 | struct ipv6hdr *ip6h; |
1da177e4 LT |
331 | struct ah_data *ahp; |
332 | unsigned char *tmp_hdr = NULL; | |
333 | u16 hdr_len; | |
334 | u16 ah_hlen; | |
335 | int nexthdr; | |
07d4ee58 | 336 | int err = -EINVAL; |
1da177e4 LT |
337 | |
338 | if (!pskb_may_pull(skb, sizeof(struct ip_auth_hdr))) | |
339 | goto out; | |
340 | ||
341 | /* We are going to _remove_ AH header to keep sockets happy, | |
342 | * so... Later this can change. */ | |
343 | if (skb_cloned(skb) && | |
344 | pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) | |
345 | goto out; | |
346 | ||
d56f90a7 | 347 | hdr_len = skb->data - skb_network_header(skb); |
87bdc48d | 348 | ah = (struct ip_auth_hdr *)skb->data; |
1da177e4 LT |
349 | ahp = x->data; |
350 | nexthdr = ah->nexthdr; | |
351 | ah_hlen = (ah->hdrlen + 2) << 2; | |
352 | ||
87bdc48d HX |
353 | if (ah_hlen != XFRM_ALIGN8(sizeof(*ah) + ahp->icv_full_len) && |
354 | ah_hlen != XFRM_ALIGN8(sizeof(*ah) + ahp->icv_trunc_len)) | |
1ab1457c | 355 | goto out; |
1da177e4 LT |
356 | |
357 | if (!pskb_may_pull(skb, ah_hlen)) | |
358 | goto out; | |
359 | ||
d56f90a7 | 360 | tmp_hdr = kmemdup(skb_network_header(skb), hdr_len, GFP_ATOMIC); |
1da177e4 LT |
361 | if (!tmp_hdr) |
362 | goto out; | |
0660e03f ACM |
363 | ip6h = ipv6_hdr(skb); |
364 | if (ipv6_clear_mutable_options(ip6h, hdr_len, XFRM_POLICY_IN)) | |
27637df9 | 365 | goto free_out; |
0660e03f ACM |
366 | ip6h->priority = 0; |
367 | ip6h->flow_lbl[0] = 0; | |
368 | ip6h->flow_lbl[1] = 0; | |
369 | ip6h->flow_lbl[2] = 0; | |
370 | ip6h->hop_limit = 0; | |
1da177e4 | 371 | |
1ab1457c | 372 | { |
1da177e4 LT |
373 | u8 auth_data[MAX_AH_AUTH_LEN]; |
374 | ||
375 | memcpy(auth_data, ah->auth_data, ahp->icv_trunc_len); | |
376 | memset(ah->auth_data, 0, ahp->icv_trunc_len); | |
31a4ab93 | 377 | skb_push(skb, hdr_len); |
07d4ee58 HX |
378 | err = ah_mac_digest(ahp, skb, ah->auth_data); |
379 | if (err) | |
380 | goto free_out; | |
381 | err = -EINVAL; | |
382 | if (memcmp(ahp->work_icv, auth_data, ahp->icv_trunc_len)) { | |
64ce2073 | 383 | LIMIT_NETDEBUG(KERN_WARNING "ipsec ah authentication error\n"); |
1da177e4 LT |
384 | x->stats.integrity_failed++; |
385 | goto free_out; | |
386 | } | |
387 | } | |
388 | ||
b0e380b1 | 389 | skb->network_header += ah_hlen; |
d56f90a7 | 390 | memcpy(skb_network_header(skb), tmp_hdr, hdr_len); |
b0e380b1 | 391 | skb->transport_header = skb->network_header; |
31a4ab93 | 392 | __skb_pull(skb, ah_hlen + hdr_len); |
1da177e4 LT |
393 | |
394 | kfree(tmp_hdr); | |
395 | ||
396 | return nexthdr; | |
397 | ||
398 | free_out: | |
399 | kfree(tmp_hdr); | |
400 | out: | |
07d4ee58 | 401 | return err; |
1da177e4 LT |
402 | } |
403 | ||
1ab1457c YH |
404 | static void ah6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
405 | int type, int code, int offset, __be32 info) | |
1da177e4 LT |
406 | { |
407 | struct ipv6hdr *iph = (struct ipv6hdr*)skb->data; | |
408 | struct ip_auth_hdr *ah = (struct ip_auth_hdr*)(skb->data+offset); | |
409 | struct xfrm_state *x; | |
410 | ||
411 | if (type != ICMPV6_DEST_UNREACH && | |
412 | type != ICMPV6_PKT_TOOBIG) | |
413 | return; | |
414 | ||
415 | x = xfrm_state_lookup((xfrm_address_t *)&iph->daddr, ah->spi, IPPROTO_AH, AF_INET6); | |
416 | if (!x) | |
417 | return; | |
418 | ||
46b86a2d | 419 | NETDEBUG(KERN_DEBUG "pmtu discovery on SA AH/%08x/" NIP6_FMT "\n", |
64ce2073 | 420 | ntohl(ah->spi), NIP6(iph->daddr)); |
1da177e4 LT |
421 | |
422 | xfrm_state_put(x); | |
423 | } | |
424 | ||
72cb6962 | 425 | static int ah6_init_state(struct xfrm_state *x) |
1da177e4 LT |
426 | { |
427 | struct ah_data *ahp = NULL; | |
428 | struct xfrm_algo_desc *aalg_desc; | |
07d4ee58 | 429 | struct crypto_hash *tfm; |
1da177e4 LT |
430 | |
431 | if (!x->aalg) | |
432 | goto error; | |
433 | ||
1da177e4 LT |
434 | if (x->encap) |
435 | goto error; | |
436 | ||
0c600eda | 437 | ahp = kzalloc(sizeof(*ahp), GFP_KERNEL); |
1da177e4 LT |
438 | if (ahp == NULL) |
439 | return -ENOMEM; | |
440 | ||
07d4ee58 HX |
441 | tfm = crypto_alloc_hash(x->aalg->alg_name, 0, CRYPTO_ALG_ASYNC); |
442 | if (IS_ERR(tfm)) | |
443 | goto error; | |
444 | ||
445 | ahp->tfm = tfm; | |
bc31d3b2 HX |
446 | if (crypto_hash_setkey(tfm, x->aalg->alg_key, |
447 | (x->aalg->alg_key_len + 7) / 8)) | |
1da177e4 | 448 | goto error; |
1ab1457c | 449 | |
1da177e4 LT |
450 | /* |
451 | * Lookup the algorithm description maintained by xfrm_algo, | |
452 | * verify crypto transform properties, and store information | |
453 | * we need for AH processing. This lookup cannot fail here | |
07d4ee58 | 454 | * after a successful crypto_alloc_hash(). |
1da177e4 LT |
455 | */ |
456 | aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0); | |
457 | BUG_ON(!aalg_desc); | |
458 | ||
459 | if (aalg_desc->uinfo.auth.icv_fullbits/8 != | |
07d4ee58 | 460 | crypto_hash_digestsize(tfm)) { |
1da177e4 | 461 | printk(KERN_INFO "AH: %s digestsize %u != %hu\n", |
07d4ee58 | 462 | x->aalg->alg_name, crypto_hash_digestsize(tfm), |
1da177e4 LT |
463 | aalg_desc->uinfo.auth.icv_fullbits/8); |
464 | goto error; | |
465 | } | |
1ab1457c | 466 | |
1da177e4 LT |
467 | ahp->icv_full_len = aalg_desc->uinfo.auth.icv_fullbits/8; |
468 | ahp->icv_trunc_len = aalg_desc->uinfo.auth.icv_truncbits/8; | |
1ab1457c | 469 | |
1da177e4 | 470 | BUG_ON(ahp->icv_trunc_len > MAX_AH_AUTH_LEN); |
1ab1457c | 471 | |
1da177e4 LT |
472 | ahp->work_icv = kmalloc(ahp->icv_full_len, GFP_KERNEL); |
473 | if (!ahp->work_icv) | |
474 | goto error; | |
1ab1457c | 475 | |
87bdc48d HX |
476 | x->props.header_len = XFRM_ALIGN8(sizeof(struct ip_auth_hdr) + |
477 | ahp->icv_trunc_len); | |
7e49e6de | 478 | if (x->props.mode == XFRM_MODE_TUNNEL) |
1da177e4 LT |
479 | x->props.header_len += sizeof(struct ipv6hdr); |
480 | x->data = ahp; | |
481 | ||
482 | return 0; | |
483 | ||
484 | error: | |
485 | if (ahp) { | |
573dbd95 | 486 | kfree(ahp->work_icv); |
07d4ee58 | 487 | crypto_free_hash(ahp->tfm); |
1da177e4 LT |
488 | kfree(ahp); |
489 | } | |
490 | return -EINVAL; | |
491 | } | |
492 | ||
493 | static void ah6_destroy(struct xfrm_state *x) | |
494 | { | |
495 | struct ah_data *ahp = x->data; | |
496 | ||
497 | if (!ahp) | |
498 | return; | |
499 | ||
573dbd95 JJ |
500 | kfree(ahp->work_icv); |
501 | ahp->work_icv = NULL; | |
07d4ee58 | 502 | crypto_free_hash(ahp->tfm); |
573dbd95 | 503 | ahp->tfm = NULL; |
1da177e4 LT |
504 | kfree(ahp); |
505 | } | |
506 | ||
507 | static struct xfrm_type ah6_type = | |
508 | { | |
509 | .description = "AH6", | |
510 | .owner = THIS_MODULE, | |
511 | .proto = IPPROTO_AH, | |
436a0a40 | 512 | .flags = XFRM_TYPE_REPLAY_PROT, |
1da177e4 LT |
513 | .init_state = ah6_init_state, |
514 | .destructor = ah6_destroy, | |
515 | .input = ah6_input, | |
aee5adb4 MN |
516 | .output = ah6_output, |
517 | .hdr_offset = xfrm6_find_1stfragopt, | |
1da177e4 LT |
518 | }; |
519 | ||
520 | static struct inet6_protocol ah6_protocol = { | |
521 | .handler = xfrm6_rcv, | |
522 | .err_handler = ah6_err, | |
523 | .flags = INET6_PROTO_NOPOLICY, | |
524 | }; | |
525 | ||
526 | static int __init ah6_init(void) | |
527 | { | |
528 | if (xfrm_register_type(&ah6_type, AF_INET6) < 0) { | |
529 | printk(KERN_INFO "ipv6 ah init: can't add xfrm type\n"); | |
530 | return -EAGAIN; | |
531 | } | |
532 | ||
533 | if (inet6_add_protocol(&ah6_protocol, IPPROTO_AH) < 0) { | |
534 | printk(KERN_INFO "ipv6 ah init: can't add protocol\n"); | |
535 | xfrm_unregister_type(&ah6_type, AF_INET6); | |
536 | return -EAGAIN; | |
537 | } | |
538 | ||
539 | return 0; | |
540 | } | |
541 | ||
542 | static void __exit ah6_fini(void) | |
543 | { | |
544 | if (inet6_del_protocol(&ah6_protocol, IPPROTO_AH) < 0) | |
545 | printk(KERN_INFO "ipv6 ah close: can't remove protocol\n"); | |
546 | ||
547 | if (xfrm_unregister_type(&ah6_type, AF_INET6) < 0) | |
548 | printk(KERN_INFO "ipv6 ah close: can't remove xfrm type\n"); | |
549 | ||
550 | } | |
551 | ||
552 | module_init(ah6_init); | |
553 | module_exit(ah6_fini); | |
554 | ||
555 | MODULE_LICENSE("GPL"); | |
d3d6dd3a | 556 | MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_AH); |