blob: 31041127eeb8006bb8729fbf769b56ffb1583e9e [file] [log] [blame]
Herbert Xu6b7326c2006-07-30 15:41:01 +10001#include <linux/err.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07002#include <linux/module.h>
3#include <net/ip.h>
4#include <net/xfrm.h>
5#include <net/esp.h>
6#include <asm/scatterlist.h>
7#include <linux/crypto.h>
Herbert Xua02a6422005-10-10 21:11:08 -07008#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07009#include <linux/pfkeyv2.h>
10#include <linux/random.h>
11#include <net/icmp.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020012#include <net/protocol.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <net/udp.h>
14
Linus Torvalds1da177e2005-04-16 15:20:36 -070015static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
16{
17 int err;
18 struct iphdr *top_iph;
19 struct ip_esp_hdr *esph;
Herbert Xu6b7326c2006-07-30 15:41:01 +100020 struct crypto_blkcipher *tfm;
21 struct blkcipher_desc desc;
Linus Torvalds1da177e2005-04-16 15:20:36 -070022 struct esp_data *esp;
23 struct sk_buff *trailer;
24 int blksize;
25 int clen;
26 int alen;
27 int nfrags;
28
29 /* Strip IP+ESP header. */
30 __skb_pull(skb, skb->h.raw - skb->data);
31 /* Now skb is pure payload to encrypt */
32
33 err = -ENOMEM;
34
35 /* Round to block size */
36 clen = skb->len;
37
38 esp = x->data;
39 alen = esp->auth.icv_trunc_len;
40 tfm = esp->conf.tfm;
Herbert Xu6b7326c2006-07-30 15:41:01 +100041 desc.tfm = tfm;
42 desc.flags = 0;
43 blksize = ALIGN(crypto_blkcipher_blocksize(tfm), 4);
Herbert Xua02a6422005-10-10 21:11:08 -070044 clen = ALIGN(clen + 2, blksize);
Linus Torvalds1da177e2005-04-16 15:20:36 -070045 if (esp->conf.padlen)
Herbert Xua02a6422005-10-10 21:11:08 -070046 clen = ALIGN(clen, esp->conf.padlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
48 if ((nfrags = skb_cow_data(skb, clen-skb->len+alen, &trailer)) < 0)
49 goto error;
50
51 /* Fill padding... */
52 do {
53 int i;
54 for (i=0; i<clen-skb->len - 2; i++)
55 *(u8*)(trailer->tail + i) = i+1;
56 } while (0);
57 *(u8*)(trailer->tail + clen-skb->len - 2) = (clen - skb->len)-2;
58 pskb_put(skb, trailer, clen - skb->len);
59
60 __skb_push(skb, skb->data - skb->nh.raw);
61 top_iph = skb->nh.iph;
62 esph = (struct ip_esp_hdr *)(skb->nh.raw + top_iph->ihl*4);
63 top_iph->tot_len = htons(skb->len + alen);
64 *(u8*)(trailer->tail - 1) = top_iph->protocol;
65
66 /* this is non-NULL only with UDP Encapsulation */
67 if (x->encap) {
68 struct xfrm_encap_tmpl *encap = x->encap;
69 struct udphdr *uh;
Al Virod5a0a1e2006-11-08 00:23:14 -080070 __be32 *udpdata32;
Linus Torvalds1da177e2005-04-16 15:20:36 -070071
72 uh = (struct udphdr *)esph;
73 uh->source = encap->encap_sport;
74 uh->dest = encap->encap_dport;
75 uh->len = htons(skb->len + alen - top_iph->ihl*4);
76 uh->check = 0;
77
78 switch (encap->encap_type) {
79 default:
80 case UDP_ENCAP_ESPINUDP:
81 esph = (struct ip_esp_hdr *)(uh + 1);
82 break;
83 case UDP_ENCAP_ESPINUDP_NON_IKE:
Al Virod5a0a1e2006-11-08 00:23:14 -080084 udpdata32 = (__be32 *)(uh + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 udpdata32[0] = udpdata32[1] = 0;
86 esph = (struct ip_esp_hdr *)(udpdata32 + 2);
87 break;
88 }
89
90 top_iph->protocol = IPPROTO_UDP;
91 } else
92 top_iph->protocol = IPPROTO_ESP;
93
94 esph->spi = x->id.spi;
95 esph->seq_no = htonl(++x->replay.oseq);
Jamal Hadi Salim9500e8a2006-03-20 19:15:29 -080096 xfrm_aevent_doreplay(x);
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
David S. Millere4bec822006-09-22 15:17:35 -070098 if (esp->conf.ivlen) {
99 if (unlikely(!esp->conf.ivinitted)) {
100 get_random_bytes(esp->conf.ivec, esp->conf.ivlen);
101 esp->conf.ivinitted = 1;
102 }
Herbert Xu6b7326c2006-07-30 15:41:01 +1000103 crypto_blkcipher_set_iv(tfm, esp->conf.ivec, esp->conf.ivlen);
David S. Millere4bec822006-09-22 15:17:35 -0700104 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105
106 do {
107 struct scatterlist *sg = &esp->sgbuf[0];
108
109 if (unlikely(nfrags > ESP_NUM_FAST_SG)) {
110 sg = kmalloc(sizeof(struct scatterlist)*nfrags, GFP_ATOMIC);
111 if (!sg)
112 goto error;
113 }
114 skb_to_sgvec(skb, sg, esph->enc_data+esp->conf.ivlen-skb->data, clen);
Herbert Xu6b7326c2006-07-30 15:41:01 +1000115 err = crypto_blkcipher_encrypt(&desc, sg, sg, clen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 if (unlikely(sg != &esp->sgbuf[0]))
117 kfree(sg);
118 } while (0);
119
Herbert Xu6b7326c2006-07-30 15:41:01 +1000120 if (unlikely(err))
121 goto error;
122
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 if (esp->conf.ivlen) {
Herbert Xu6b7326c2006-07-30 15:41:01 +1000124 memcpy(esph->enc_data, esp->conf.ivec, esp->conf.ivlen);
125 crypto_blkcipher_get_iv(tfm, esp->conf.ivec, esp->conf.ivlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 }
127
128 if (esp->auth.icv_full_len) {
Herbert Xu07d4ee52006-08-20 14:24:50 +1000129 err = esp_mac_digest(esp, skb, (u8 *)esph - skb->data,
130 sizeof(*esph) + esp->conf.ivlen + clen);
131 memcpy(pskb_put(skb, trailer, alen), esp->auth.work_icv, alen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 }
133
134 ip_send_check(top_iph);
135
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136error:
137 return err;
138}
139
140/*
141 * Note: detecting truncated vs. non-truncated authentication data is very
142 * expensive, so we only support truncated data, which is the recommended
143 * and common case.
144 */
Herbert Xue6956332006-04-01 00:52:46 -0800145static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146{
147 struct iphdr *iph;
148 struct ip_esp_hdr *esph;
149 struct esp_data *esp = x->data;
Herbert Xu6b7326c2006-07-30 15:41:01 +1000150 struct crypto_blkcipher *tfm = esp->conf.tfm;
151 struct blkcipher_desc desc = { .tfm = tfm };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 struct sk_buff *trailer;
Herbert Xu6b7326c2006-07-30 15:41:01 +1000153 int blksize = ALIGN(crypto_blkcipher_blocksize(tfm), 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 int alen = esp->auth.icv_trunc_len;
155 int elen = skb->len - sizeof(struct ip_esp_hdr) - esp->conf.ivlen - alen;
156 int nfrags;
Herbert Xu31a4ab92006-05-27 23:06:13 -0700157 int ihl;
Herbert Xu4bf05ec2006-02-27 13:00:01 -0800158 u8 nexthdr[2];
159 struct scatterlist *sg;
Herbert Xu4bf05ec2006-02-27 13:00:01 -0800160 int padlen;
Herbert Xu6b7326c2006-07-30 15:41:01 +1000161 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162
163 if (!pskb_may_pull(skb, sizeof(struct ip_esp_hdr)))
164 goto out;
165
166 if (elen <= 0 || (elen & (blksize-1)))
167 goto out;
168
169 /* If integrity check is required, do this. */
170 if (esp->auth.icv_full_len) {
Herbert Xu07d4ee52006-08-20 14:24:50 +1000171 u8 sum[alen];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172
Herbert Xu07d4ee52006-08-20 14:24:50 +1000173 err = esp_mac_digest(esp, skb, 0, skb->len - alen);
174 if (err)
175 goto out;
176
177 if (skb_copy_bits(skb, skb->len - alen, sum, alen))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 BUG();
179
Herbert Xu07d4ee52006-08-20 14:24:50 +1000180 if (unlikely(memcmp(esp->auth.work_icv, sum, alen))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 x->stats.integrity_failed++;
182 goto out;
183 }
184 }
185
186 if ((nfrags = skb_cow_data(skb, 0, &trailer)) < 0)
187 goto out;
188
189 skb->ip_summed = CHECKSUM_NONE;
190
191 esph = (struct ip_esp_hdr*)skb->data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192
193 /* Get ivec. This can be wrong, check against another impls. */
194 if (esp->conf.ivlen)
Herbert Xu6b7326c2006-07-30 15:41:01 +1000195 crypto_blkcipher_set_iv(tfm, esph->enc_data, esp->conf.ivlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196
Herbert Xu4bf05ec2006-02-27 13:00:01 -0800197 sg = &esp->sgbuf[0];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198
Herbert Xu4bf05ec2006-02-27 13:00:01 -0800199 if (unlikely(nfrags > ESP_NUM_FAST_SG)) {
200 sg = kmalloc(sizeof(struct scatterlist)*nfrags, GFP_ATOMIC);
201 if (!sg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 }
Herbert Xu4bf05ec2006-02-27 13:00:01 -0800204 skb_to_sgvec(skb, sg, sizeof(struct ip_esp_hdr) + esp->conf.ivlen, elen);
Herbert Xu6b7326c2006-07-30 15:41:01 +1000205 err = crypto_blkcipher_decrypt(&desc, sg, sg, elen);
Herbert Xu4bf05ec2006-02-27 13:00:01 -0800206 if (unlikely(sg != &esp->sgbuf[0]))
207 kfree(sg);
Herbert Xu6b7326c2006-07-30 15:41:01 +1000208 if (unlikely(err))
209 return err;
Herbert Xu4bf05ec2006-02-27 13:00:01 -0800210
211 if (skb_copy_bits(skb, skb->len-alen-2, nexthdr, 2))
212 BUG();
213
214 padlen = nexthdr[0];
215 if (padlen+2 >= elen)
216 goto out;
217
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900218 /* ... check padding bits here. Silly. :-) */
Herbert Xu4bf05ec2006-02-27 13:00:01 -0800219
Herbert Xu31a4ab92006-05-27 23:06:13 -0700220 iph = skb->nh.iph;
221 ihl = iph->ihl * 4;
222
Herbert Xu752c1f42006-02-27 13:00:40 -0800223 if (x->encap) {
224 struct xfrm_encap_tmpl *encap = x->encap;
Herbert Xu31a4ab92006-05-27 23:06:13 -0700225 struct udphdr *uh = (void *)(skb->nh.raw + ihl);
Herbert Xu752c1f42006-02-27 13:00:40 -0800226
227 /*
228 * 1) if the NAT-T peer's IP or port changed then
229 * advertize the change to the keying daemon.
230 * This is an inbound SA, so just compare
231 * SRC ports.
232 */
233 if (iph->saddr != x->props.saddr.a4 ||
234 uh->source != encap->encap_sport) {
235 xfrm_address_t ipaddr;
236
237 ipaddr.a4 = iph->saddr;
238 km_new_mapping(x, &ipaddr, uh->source);
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900239
Herbert Xu752c1f42006-02-27 13:00:40 -0800240 /* XXX: perhaps add an extra
241 * policy check here, to see
242 * if we should allow or
243 * reject a packet from a
244 * different source
245 * address/port.
246 */
Herbert Xu4bf05ec2006-02-27 13:00:01 -0800247 }
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900248
Herbert Xu752c1f42006-02-27 13:00:40 -0800249 /*
250 * 2) ignore UDP/TCP checksums in case
251 * of NAT-T in Transport Mode, or
252 * perform other post-processing fixes
253 * as per draft-ietf-ipsec-udp-encaps-06,
254 * section 3.1.2
255 */
Diego Beltrami0a694522006-10-03 23:47:05 -0700256 if (x->props.mode == XFRM_MODE_TRANSPORT ||
257 x->props.mode == XFRM_MODE_BEET)
Herbert Xu752c1f42006-02-27 13:00:40 -0800258 skb->ip_summed = CHECKSUM_UNNECESSARY;
Herbert Xu4bf05ec2006-02-27 13:00:01 -0800259 }
260
261 iph->protocol = nexthdr[1];
262 pskb_trim(skb, skb->len - alen - padlen - 2);
Herbert Xu31a4ab92006-05-27 23:06:13 -0700263 skb->h.raw = __skb_pull(skb, sizeof(*esph) + esp->conf.ivlen) - ihl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264
265 return 0;
266
267out:
268 return -EINVAL;
269}
270
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271static u32 esp4_get_max_size(struct xfrm_state *x, int mtu)
272{
273 struct esp_data *esp = x->data;
Herbert Xu6b7326c2006-07-30 15:41:01 +1000274 u32 blksize = ALIGN(crypto_blkcipher_blocksize(esp->conf.tfm), 4);
Diego Beltrami0a694522006-10-03 23:47:05 -0700275 int enclen = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276
Diego Beltrami0a694522006-10-03 23:47:05 -0700277 switch (x->props.mode) {
278 case XFRM_MODE_TUNNEL:
279 mtu = ALIGN(mtu +2, blksize);
280 break;
281 default:
282 case XFRM_MODE_TRANSPORT:
283 /* The worst case */
Herbert Xud4875b02005-10-10 21:11:34 -0700284 mtu = ALIGN(mtu + 2, 4) + blksize - 4;
Diego Beltrami0a694522006-10-03 23:47:05 -0700285 break;
286 case XFRM_MODE_BEET:
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900287 /* The worst case. */
Diego Beltrami0a694522006-10-03 23:47:05 -0700288 enclen = IPV4_BEET_PHMAXLEN;
289 mtu = ALIGN(mtu + enclen + 2, blksize);
290 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 }
Diego Beltrami0a694522006-10-03 23:47:05 -0700292
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 if (esp->conf.padlen)
Herbert Xua02a6422005-10-10 21:11:08 -0700294 mtu = ALIGN(mtu, esp->conf.padlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295
Diego Beltrami0a694522006-10-03 23:47:05 -0700296 return mtu + x->props.header_len + esp->auth.icv_trunc_len - enclen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297}
298
299static void esp4_err(struct sk_buff *skb, u32 info)
300{
301 struct iphdr *iph = (struct iphdr*)skb->data;
302 struct ip_esp_hdr *esph = (struct ip_esp_hdr*)(skb->data+(iph->ihl<<2));
303 struct xfrm_state *x;
304
305 if (skb->h.icmph->type != ICMP_DEST_UNREACH ||
306 skb->h.icmph->code != ICMP_FRAG_NEEDED)
307 return;
308
309 x = xfrm_state_lookup((xfrm_address_t *)&iph->daddr, esph->spi, IPPROTO_ESP, AF_INET);
310 if (!x)
311 return;
Patrick McHardy64ce2072005-08-09 20:50:53 -0700312 NETDEBUG(KERN_DEBUG "pmtu discovery on SA ESP/%08x/%08x\n",
313 ntohl(esph->spi), ntohl(iph->daddr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 xfrm_state_put(x);
315}
316
317static void esp_destroy(struct xfrm_state *x)
318{
319 struct esp_data *esp = x->data;
320
321 if (!esp)
322 return;
323
Herbert Xu6b7326c2006-07-30 15:41:01 +1000324 crypto_free_blkcipher(esp->conf.tfm);
Jesper Juhl573dbd92005-09-01 17:44:29 -0700325 esp->conf.tfm = NULL;
326 kfree(esp->conf.ivec);
327 esp->conf.ivec = NULL;
Herbert Xu07d4ee52006-08-20 14:24:50 +1000328 crypto_free_hash(esp->auth.tfm);
Jesper Juhl573dbd92005-09-01 17:44:29 -0700329 esp->auth.tfm = NULL;
330 kfree(esp->auth.work_icv);
331 esp->auth.work_icv = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 kfree(esp);
333}
334
Herbert Xu72cb6962005-06-20 13:18:08 -0700335static int esp_init_state(struct xfrm_state *x)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336{
337 struct esp_data *esp = NULL;
Herbert Xu6b7326c2006-07-30 15:41:01 +1000338 struct crypto_blkcipher *tfm;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339
340 /* null auth and encryption can have zero length keys */
341 if (x->aalg) {
342 if (x->aalg->alg_key_len > 512)
343 goto error;
344 }
345 if (x->ealg == NULL)
346 goto error;
347
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700348 esp = kzalloc(sizeof(*esp), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 if (esp == NULL)
350 return -ENOMEM;
351
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 if (x->aalg) {
353 struct xfrm_algo_desc *aalg_desc;
Herbert Xu07d4ee52006-08-20 14:24:50 +1000354 struct crypto_hash *hash;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355
356 esp->auth.key = x->aalg->alg_key;
357 esp->auth.key_len = (x->aalg->alg_key_len+7)/8;
Herbert Xu07d4ee52006-08-20 14:24:50 +1000358 hash = crypto_alloc_hash(x->aalg->alg_name, 0,
359 CRYPTO_ALG_ASYNC);
360 if (IS_ERR(hash))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 goto error;
Herbert Xu07d4ee52006-08-20 14:24:50 +1000362
363 esp->auth.tfm = hash;
364 if (crypto_hash_setkey(hash, esp->auth.key, esp->auth.key_len))
365 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366
367 aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
368 BUG_ON(!aalg_desc);
369
370 if (aalg_desc->uinfo.auth.icv_fullbits/8 !=
Herbert Xu07d4ee52006-08-20 14:24:50 +1000371 crypto_hash_digestsize(hash)) {
Patrick McHardy64ce2072005-08-09 20:50:53 -0700372 NETDEBUG(KERN_INFO "ESP: %s digestsize %u != %hu\n",
373 x->aalg->alg_name,
Herbert Xu07d4ee52006-08-20 14:24:50 +1000374 crypto_hash_digestsize(hash),
Patrick McHardy64ce2072005-08-09 20:50:53 -0700375 aalg_desc->uinfo.auth.icv_fullbits/8);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 goto error;
377 }
378
379 esp->auth.icv_full_len = aalg_desc->uinfo.auth.icv_fullbits/8;
380 esp->auth.icv_trunc_len = aalg_desc->uinfo.auth.icv_truncbits/8;
381
382 esp->auth.work_icv = kmalloc(esp->auth.icv_full_len, GFP_KERNEL);
383 if (!esp->auth.work_icv)
384 goto error;
385 }
386 esp->conf.key = x->ealg->alg_key;
387 esp->conf.key_len = (x->ealg->alg_key_len+7)/8;
Herbert Xu6b7326c2006-07-30 15:41:01 +1000388 tfm = crypto_alloc_blkcipher(x->ealg->alg_name, 0, CRYPTO_ALG_ASYNC);
389 if (IS_ERR(tfm))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 goto error;
Herbert Xu6b7326c2006-07-30 15:41:01 +1000391 esp->conf.tfm = tfm;
392 esp->conf.ivlen = crypto_blkcipher_ivsize(tfm);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 esp->conf.padlen = 0;
394 if (esp->conf.ivlen) {
395 esp->conf.ivec = kmalloc(esp->conf.ivlen, GFP_KERNEL);
396 if (unlikely(esp->conf.ivec == NULL))
397 goto error;
David S. Millere4bec822006-09-22 15:17:35 -0700398 esp->conf.ivinitted = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 }
Herbert Xu6b7326c2006-07-30 15:41:01 +1000400 if (crypto_blkcipher_setkey(tfm, esp->conf.key, esp->conf.key_len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 goto error;
402 x->props.header_len = sizeof(struct ip_esp_hdr) + esp->conf.ivlen;
Masahide NAKAMURA7e49e6d2006-09-22 15:05:15 -0700403 if (x->props.mode == XFRM_MODE_TUNNEL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 x->props.header_len += sizeof(struct iphdr);
405 if (x->encap) {
406 struct xfrm_encap_tmpl *encap = x->encap;
407
408 switch (encap->encap_type) {
409 default:
410 goto error;
411 case UDP_ENCAP_ESPINUDP:
412 x->props.header_len += sizeof(struct udphdr);
413 break;
414 case UDP_ENCAP_ESPINUDP_NON_IKE:
415 x->props.header_len += sizeof(struct udphdr) + 2 * sizeof(u32);
416 break;
417 }
418 }
419 x->data = esp;
420 x->props.trailer_len = esp4_get_max_size(x, 0) - x->props.header_len;
421 return 0;
422
423error:
424 x->data = esp;
425 esp_destroy(x);
426 x->data = NULL;
427 return -EINVAL;
428}
429
430static struct xfrm_type esp_type =
431{
432 .description = "ESP4",
433 .owner = THIS_MODULE,
434 .proto = IPPROTO_ESP,
435 .init_state = esp_init_state,
436 .destructor = esp_destroy,
437 .get_max_size = esp4_get_max_size,
438 .input = esp_input,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 .output = esp_output
440};
441
442static struct net_protocol esp4_protocol = {
443 .handler = xfrm4_rcv,
444 .err_handler = esp4_err,
445 .no_policy = 1,
446};
447
448static int __init esp4_init(void)
449{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 if (xfrm_register_type(&esp_type, AF_INET) < 0) {
451 printk(KERN_INFO "ip esp init: can't add xfrm type\n");
452 return -EAGAIN;
453 }
454 if (inet_add_protocol(&esp4_protocol, IPPROTO_ESP) < 0) {
455 printk(KERN_INFO "ip esp init: can't add protocol\n");
456 xfrm_unregister_type(&esp_type, AF_INET);
457 return -EAGAIN;
458 }
459 return 0;
460}
461
462static void __exit esp4_fini(void)
463{
464 if (inet_del_protocol(&esp4_protocol, IPPROTO_ESP) < 0)
465 printk(KERN_INFO "ip esp close: can't remove protocol\n");
466 if (xfrm_unregister_type(&esp_type, AF_INET) < 0)
467 printk(KERN_INFO "ip esp close: can't remove xfrm type\n");
468}
469
470module_init(esp4_init);
471module_exit(esp4_fini);
472MODULE_LICENSE("GPL");