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Commit | Line | Data |
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6b7326c8 | 1 | #include <linux/err.h> |
1da177e4 LT |
2 | #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> | |
a02a6422 | 8 | #include <linux/kernel.h> |
1da177e4 LT |
9 | #include <linux/pfkeyv2.h> |
10 | #include <linux/random.h> | |
b7c6538c | 11 | #include <linux/spinlock.h> |
1da177e4 | 12 | #include <net/icmp.h> |
14c85021 | 13 | #include <net/protocol.h> |
1da177e4 LT |
14 | #include <net/udp.h> |
15 | ||
1da177e4 LT |
16 | static int esp_output(struct xfrm_state *x, struct sk_buff *skb) |
17 | { | |
18 | int err; | |
19 | struct iphdr *top_iph; | |
20 | struct ip_esp_hdr *esph; | |
6b7326c8 HX |
21 | struct crypto_blkcipher *tfm; |
22 | struct blkcipher_desc desc; | |
1da177e4 LT |
23 | struct esp_data *esp; |
24 | struct sk_buff *trailer; | |
27a884dc | 25 | u8 *tail; |
1da177e4 LT |
26 | int blksize; |
27 | int clen; | |
28 | int alen; | |
29 | int nfrags; | |
30 | ||
7b277b1a | 31 | /* skb is pure payload to encrypt */ |
1da177e4 LT |
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; | |
6b7326c8 HX |
41 | desc.tfm = tfm; |
42 | desc.flags = 0; | |
43 | blksize = ALIGN(crypto_blkcipher_blocksize(tfm), 4); | |
a02a6422 | 44 | clen = ALIGN(clen + 2, blksize); |
1da177e4 | 45 | if (esp->conf.padlen) |
a02a6422 | 46 | clen = ALIGN(clen, esp->conf.padlen); |
1da177e4 LT |
47 | |
48 | if ((nfrags = skb_cow_data(skb, clen-skb->len+alen, &trailer)) < 0) | |
49 | goto error; | |
50 | ||
51 | /* Fill padding... */ | |
27a884dc | 52 | tail = skb_tail_pointer(trailer); |
1da177e4 LT |
53 | do { |
54 | int i; | |
55 | for (i=0; i<clen-skb->len - 2; i++) | |
27a884dc | 56 | tail[i] = i + 1; |
1da177e4 | 57 | } while (0); |
27a884dc | 58 | tail[clen - skb->len - 2] = (clen - skb->len) - 2; |
1da177e4 LT |
59 | pskb_put(skb, trailer, clen - skb->len); |
60 | ||
7b277b1a | 61 | skb_push(skb, -skb_network_offset(skb)); |
eddc9ec5 | 62 | top_iph = ip_hdr(skb); |
d56f90a7 ACM |
63 | esph = (struct ip_esp_hdr *)(skb_network_header(skb) + |
64 | top_iph->ihl * 4); | |
1da177e4 | 65 | top_iph->tot_len = htons(skb->len + alen); |
55792258 | 66 | *(skb_tail_pointer(trailer) - 1) = top_iph->protocol; |
1da177e4 | 67 | |
b7c6538c HX |
68 | spin_lock_bh(&x->lock); |
69 | ||
1da177e4 LT |
70 | /* this is non-NULL only with UDP Encapsulation */ |
71 | if (x->encap) { | |
72 | struct xfrm_encap_tmpl *encap = x->encap; | |
73 | struct udphdr *uh; | |
d5a0a1e3 | 74 | __be32 *udpdata32; |
1da177e4 LT |
75 | |
76 | uh = (struct udphdr *)esph; | |
77 | uh->source = encap->encap_sport; | |
78 | uh->dest = encap->encap_dport; | |
79 | uh->len = htons(skb->len + alen - top_iph->ihl*4); | |
80 | uh->check = 0; | |
81 | ||
82 | switch (encap->encap_type) { | |
83 | default: | |
84 | case UDP_ENCAP_ESPINUDP: | |
85 | esph = (struct ip_esp_hdr *)(uh + 1); | |
86 | break; | |
87 | case UDP_ENCAP_ESPINUDP_NON_IKE: | |
d5a0a1e3 | 88 | udpdata32 = (__be32 *)(uh + 1); |
1da177e4 LT |
89 | udpdata32[0] = udpdata32[1] = 0; |
90 | esph = (struct ip_esp_hdr *)(udpdata32 + 2); | |
91 | break; | |
92 | } | |
93 | ||
94 | top_iph->protocol = IPPROTO_UDP; | |
95 | } else | |
96 | top_iph->protocol = IPPROTO_ESP; | |
97 | ||
98 | esph->spi = x->id.spi; | |
436a0a40 | 99 | esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq); |
1da177e4 | 100 | |
e4bec827 DM |
101 | if (esp->conf.ivlen) { |
102 | if (unlikely(!esp->conf.ivinitted)) { | |
103 | get_random_bytes(esp->conf.ivec, esp->conf.ivlen); | |
104 | esp->conf.ivinitted = 1; | |
105 | } | |
6b7326c8 | 106 | crypto_blkcipher_set_iv(tfm, esp->conf.ivec, esp->conf.ivlen); |
e4bec827 | 107 | } |
1da177e4 LT |
108 | |
109 | do { | |
110 | struct scatterlist *sg = &esp->sgbuf[0]; | |
111 | ||
112 | if (unlikely(nfrags > ESP_NUM_FAST_SG)) { | |
113 | sg = kmalloc(sizeof(struct scatterlist)*nfrags, GFP_ATOMIC); | |
114 | if (!sg) | |
b7c6538c | 115 | goto unlock; |
1da177e4 LT |
116 | } |
117 | skb_to_sgvec(skb, sg, esph->enc_data+esp->conf.ivlen-skb->data, clen); | |
6b7326c8 | 118 | err = crypto_blkcipher_encrypt(&desc, sg, sg, clen); |
1da177e4 LT |
119 | if (unlikely(sg != &esp->sgbuf[0])) |
120 | kfree(sg); | |
121 | } while (0); | |
122 | ||
6b7326c8 | 123 | if (unlikely(err)) |
b7c6538c | 124 | goto unlock; |
6b7326c8 | 125 | |
1da177e4 | 126 | if (esp->conf.ivlen) { |
6b7326c8 HX |
127 | memcpy(esph->enc_data, esp->conf.ivec, esp->conf.ivlen); |
128 | crypto_blkcipher_get_iv(tfm, esp->conf.ivec, esp->conf.ivlen); | |
1da177e4 LT |
129 | } |
130 | ||
131 | if (esp->auth.icv_full_len) { | |
07d4ee58 HX |
132 | err = esp_mac_digest(esp, skb, (u8 *)esph - skb->data, |
133 | sizeof(*esph) + esp->conf.ivlen + clen); | |
134 | memcpy(pskb_put(skb, trailer, alen), esp->auth.work_icv, alen); | |
1da177e4 LT |
135 | } |
136 | ||
b7c6538c HX |
137 | unlock: |
138 | spin_unlock_bh(&x->lock); | |
139 | ||
1da177e4 LT |
140 | ip_send_check(top_iph); |
141 | ||
1da177e4 LT |
142 | error: |
143 | return err; | |
144 | } | |
145 | ||
146 | /* | |
147 | * Note: detecting truncated vs. non-truncated authentication data is very | |
148 | * expensive, so we only support truncated data, which is the recommended | |
149 | * and common case. | |
150 | */ | |
e695633e | 151 | static int esp_input(struct xfrm_state *x, struct sk_buff *skb) |
1da177e4 LT |
152 | { |
153 | struct iphdr *iph; | |
154 | struct ip_esp_hdr *esph; | |
155 | struct esp_data *esp = x->data; | |
6b7326c8 HX |
156 | struct crypto_blkcipher *tfm = esp->conf.tfm; |
157 | struct blkcipher_desc desc = { .tfm = tfm }; | |
1da177e4 | 158 | struct sk_buff *trailer; |
6b7326c8 | 159 | int blksize = ALIGN(crypto_blkcipher_blocksize(tfm), 4); |
1da177e4 LT |
160 | int alen = esp->auth.icv_trunc_len; |
161 | int elen = skb->len - sizeof(struct ip_esp_hdr) - esp->conf.ivlen - alen; | |
162 | int nfrags; | |
31a4ab93 | 163 | int ihl; |
4bf05ece HX |
164 | u8 nexthdr[2]; |
165 | struct scatterlist *sg; | |
4bf05ece | 166 | int padlen; |
6b7326c8 | 167 | int err; |
1da177e4 LT |
168 | |
169 | if (!pskb_may_pull(skb, sizeof(struct ip_esp_hdr))) | |
170 | goto out; | |
171 | ||
172 | if (elen <= 0 || (elen & (blksize-1))) | |
173 | goto out; | |
174 | ||
175 | /* If integrity check is required, do this. */ | |
176 | if (esp->auth.icv_full_len) { | |
07d4ee58 | 177 | u8 sum[alen]; |
1da177e4 | 178 | |
07d4ee58 HX |
179 | err = esp_mac_digest(esp, skb, 0, skb->len - alen); |
180 | if (err) | |
181 | goto out; | |
182 | ||
183 | if (skb_copy_bits(skb, skb->len - alen, sum, alen)) | |
1da177e4 LT |
184 | BUG(); |
185 | ||
07d4ee58 | 186 | if (unlikely(memcmp(esp->auth.work_icv, sum, alen))) { |
1da177e4 LT |
187 | x->stats.integrity_failed++; |
188 | goto out; | |
189 | } | |
190 | } | |
191 | ||
192 | if ((nfrags = skb_cow_data(skb, 0, &trailer)) < 0) | |
193 | goto out; | |
194 | ||
195 | skb->ip_summed = CHECKSUM_NONE; | |
196 | ||
197 | esph = (struct ip_esp_hdr*)skb->data; | |
1da177e4 LT |
198 | |
199 | /* Get ivec. This can be wrong, check against another impls. */ | |
200 | if (esp->conf.ivlen) | |
6b7326c8 | 201 | crypto_blkcipher_set_iv(tfm, esph->enc_data, esp->conf.ivlen); |
1da177e4 | 202 | |
4bf05ece | 203 | sg = &esp->sgbuf[0]; |
1da177e4 | 204 | |
4bf05ece HX |
205 | if (unlikely(nfrags > ESP_NUM_FAST_SG)) { |
206 | sg = kmalloc(sizeof(struct scatterlist)*nfrags, GFP_ATOMIC); | |
207 | if (!sg) | |
208 | goto out; | |
209 | } | |
210 | skb_to_sgvec(skb, sg, sizeof(struct ip_esp_hdr) + esp->conf.ivlen, elen); | |
6b7326c8 | 211 | err = crypto_blkcipher_decrypt(&desc, sg, sg, elen); |
4bf05ece HX |
212 | if (unlikely(sg != &esp->sgbuf[0])) |
213 | kfree(sg); | |
6b7326c8 HX |
214 | if (unlikely(err)) |
215 | return err; | |
1da177e4 | 216 | |
4bf05ece HX |
217 | if (skb_copy_bits(skb, skb->len-alen-2, nexthdr, 2)) |
218 | BUG(); | |
1da177e4 | 219 | |
4bf05ece HX |
220 | padlen = nexthdr[0]; |
221 | if (padlen+2 >= elen) | |
222 | goto out; | |
1da177e4 | 223 | |
e905a9ed | 224 | /* ... check padding bits here. Silly. :-) */ |
1da177e4 | 225 | |
eddc9ec5 | 226 | iph = ip_hdr(skb); |
31a4ab93 HX |
227 | ihl = iph->ihl * 4; |
228 | ||
752c1f4c HX |
229 | if (x->encap) { |
230 | struct xfrm_encap_tmpl *encap = x->encap; | |
d56f90a7 | 231 | struct udphdr *uh = (void *)(skb_network_header(skb) + ihl); |
752c1f4c HX |
232 | |
233 | /* | |
234 | * 1) if the NAT-T peer's IP or port changed then | |
235 | * advertize the change to the keying daemon. | |
236 | * This is an inbound SA, so just compare | |
237 | * SRC ports. | |
238 | */ | |
239 | if (iph->saddr != x->props.saddr.a4 || | |
240 | uh->source != encap->encap_sport) { | |
241 | xfrm_address_t ipaddr; | |
242 | ||
243 | ipaddr.a4 = iph->saddr; | |
244 | km_new_mapping(x, &ipaddr, uh->source); | |
e905a9ed | 245 | |
752c1f4c HX |
246 | /* XXX: perhaps add an extra |
247 | * policy check here, to see | |
248 | * if we should allow or | |
249 | * reject a packet from a | |
250 | * different source | |
251 | * address/port. | |
252 | */ | |
1da177e4 | 253 | } |
e905a9ed | 254 | |
752c1f4c HX |
255 | /* |
256 | * 2) ignore UDP/TCP checksums in case | |
257 | * of NAT-T in Transport Mode, or | |
258 | * perform other post-processing fixes | |
259 | * as per draft-ietf-ipsec-udp-encaps-06, | |
260 | * section 3.1.2 | |
261 | */ | |
8bd17075 | 262 | if (x->props.mode == XFRM_MODE_TRANSPORT) |
752c1f4c | 263 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1da177e4 LT |
264 | } |
265 | ||
4bf05ece HX |
266 | iph->protocol = nexthdr[1]; |
267 | pskb_trim(skb, skb->len - alen - padlen - 2); | |
967b05f6 ACM |
268 | __skb_pull(skb, sizeof(*esph) + esp->conf.ivlen); |
269 | skb_set_transport_header(skb, -ihl); | |
4bf05ece | 270 | |
1da177e4 LT |
271 | return 0; |
272 | ||
273 | out: | |
274 | return -EINVAL; | |
275 | } | |
276 | ||
c5c25238 | 277 | static u32 esp4_get_mtu(struct xfrm_state *x, int mtu) |
1da177e4 LT |
278 | { |
279 | struct esp_data *esp = x->data; | |
6b7326c8 | 280 | u32 blksize = ALIGN(crypto_blkcipher_blocksize(esp->conf.tfm), 4); |
c5c25238 PM |
281 | u32 align = max_t(u32, blksize, esp->conf.padlen); |
282 | u32 rem; | |
283 | ||
284 | mtu -= x->props.header_len + esp->auth.icv_trunc_len; | |
285 | rem = mtu & (align - 1); | |
286 | mtu &= ~(align - 1); | |
0a69452c DB |
287 | |
288 | switch (x->props.mode) { | |
289 | case XFRM_MODE_TUNNEL: | |
0a69452c DB |
290 | break; |
291 | default: | |
292 | case XFRM_MODE_TRANSPORT: | |
293 | /* The worst case */ | |
c5c25238 PM |
294 | mtu -= blksize - 4; |
295 | mtu += min_t(u32, blksize - 4, rem); | |
0a69452c DB |
296 | break; |
297 | case XFRM_MODE_BEET: | |
e905a9ed | 298 | /* The worst case. */ |
c5c25238 | 299 | mtu += min_t(u32, IPV4_BEET_PHMAXLEN, rem); |
0a69452c | 300 | break; |
1da177e4 | 301 | } |
0a69452c | 302 | |
c5c25238 | 303 | return mtu - 2; |
1da177e4 LT |
304 | } |
305 | ||
306 | static void esp4_err(struct sk_buff *skb, u32 info) | |
307 | { | |
308 | struct iphdr *iph = (struct iphdr*)skb->data; | |
309 | struct ip_esp_hdr *esph = (struct ip_esp_hdr*)(skb->data+(iph->ihl<<2)); | |
310 | struct xfrm_state *x; | |
311 | ||
88c7664f ACM |
312 | if (icmp_hdr(skb)->type != ICMP_DEST_UNREACH || |
313 | icmp_hdr(skb)->code != ICMP_FRAG_NEEDED) | |
1da177e4 LT |
314 | return; |
315 | ||
316 | x = xfrm_state_lookup((xfrm_address_t *)&iph->daddr, esph->spi, IPPROTO_ESP, AF_INET); | |
317 | if (!x) | |
318 | return; | |
64ce2073 PM |
319 | NETDEBUG(KERN_DEBUG "pmtu discovery on SA ESP/%08x/%08x\n", |
320 | ntohl(esph->spi), ntohl(iph->daddr)); | |
1da177e4 LT |
321 | xfrm_state_put(x); |
322 | } | |
323 | ||
324 | static void esp_destroy(struct xfrm_state *x) | |
325 | { | |
326 | struct esp_data *esp = x->data; | |
327 | ||
328 | if (!esp) | |
329 | return; | |
330 | ||
6b7326c8 | 331 | crypto_free_blkcipher(esp->conf.tfm); |
573dbd95 JJ |
332 | esp->conf.tfm = NULL; |
333 | kfree(esp->conf.ivec); | |
334 | esp->conf.ivec = NULL; | |
07d4ee58 | 335 | crypto_free_hash(esp->auth.tfm); |
573dbd95 JJ |
336 | esp->auth.tfm = NULL; |
337 | kfree(esp->auth.work_icv); | |
338 | esp->auth.work_icv = NULL; | |
1da177e4 LT |
339 | kfree(esp); |
340 | } | |
341 | ||
72cb6962 | 342 | static int esp_init_state(struct xfrm_state *x) |
1da177e4 LT |
343 | { |
344 | struct esp_data *esp = NULL; | |
6b7326c8 | 345 | struct crypto_blkcipher *tfm; |
c5c25238 | 346 | u32 align; |
1da177e4 | 347 | |
1da177e4 LT |
348 | if (x->ealg == NULL) |
349 | goto error; | |
350 | ||
0da974f4 | 351 | esp = kzalloc(sizeof(*esp), GFP_KERNEL); |
1da177e4 LT |
352 | if (esp == NULL) |
353 | return -ENOMEM; | |
354 | ||
1da177e4 LT |
355 | if (x->aalg) { |
356 | struct xfrm_algo_desc *aalg_desc; | |
07d4ee58 | 357 | struct crypto_hash *hash; |
1da177e4 | 358 | |
07d4ee58 HX |
359 | hash = crypto_alloc_hash(x->aalg->alg_name, 0, |
360 | CRYPTO_ALG_ASYNC); | |
361 | if (IS_ERR(hash)) | |
362 | goto error; | |
363 | ||
364 | esp->auth.tfm = hash; | |
4b7137ff HX |
365 | if (crypto_hash_setkey(hash, x->aalg->alg_key, |
366 | (x->aalg->alg_key_len + 7) / 8)) | |
1da177e4 | 367 | goto error; |
1da177e4 LT |
368 | |
369 | aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0); | |
370 | BUG_ON(!aalg_desc); | |
371 | ||
372 | if (aalg_desc->uinfo.auth.icv_fullbits/8 != | |
07d4ee58 | 373 | crypto_hash_digestsize(hash)) { |
64ce2073 PM |
374 | NETDEBUG(KERN_INFO "ESP: %s digestsize %u != %hu\n", |
375 | x->aalg->alg_name, | |
07d4ee58 | 376 | crypto_hash_digestsize(hash), |
64ce2073 | 377 | aalg_desc->uinfo.auth.icv_fullbits/8); |
1da177e4 LT |
378 | goto error; |
379 | } | |
380 | ||
381 | esp->auth.icv_full_len = aalg_desc->uinfo.auth.icv_fullbits/8; | |
382 | esp->auth.icv_trunc_len = aalg_desc->uinfo.auth.icv_truncbits/8; | |
383 | ||
384 | esp->auth.work_icv = kmalloc(esp->auth.icv_full_len, GFP_KERNEL); | |
385 | if (!esp->auth.work_icv) | |
386 | goto error; | |
387 | } | |
4b7137ff | 388 | |
6b7326c8 HX |
389 | tfm = crypto_alloc_blkcipher(x->ealg->alg_name, 0, CRYPTO_ALG_ASYNC); |
390 | if (IS_ERR(tfm)) | |
1da177e4 | 391 | goto error; |
6b7326c8 HX |
392 | esp->conf.tfm = tfm; |
393 | esp->conf.ivlen = crypto_blkcipher_ivsize(tfm); | |
1da177e4 LT |
394 | esp->conf.padlen = 0; |
395 | if (esp->conf.ivlen) { | |
396 | esp->conf.ivec = kmalloc(esp->conf.ivlen, GFP_KERNEL); | |
397 | if (unlikely(esp->conf.ivec == NULL)) | |
398 | goto error; | |
e4bec827 | 399 | esp->conf.ivinitted = 0; |
1da177e4 | 400 | } |
4b7137ff HX |
401 | if (crypto_blkcipher_setkey(tfm, x->ealg->alg_key, |
402 | (x->ealg->alg_key_len + 7) / 8)) | |
1da177e4 LT |
403 | goto error; |
404 | x->props.header_len = sizeof(struct ip_esp_hdr) + esp->conf.ivlen; | |
7e49e6de | 405 | if (x->props.mode == XFRM_MODE_TUNNEL) |
1da177e4 | 406 | x->props.header_len += sizeof(struct iphdr); |
ac758e3c PM |
407 | else if (x->props.mode == XFRM_MODE_BEET) |
408 | x->props.header_len += IPV4_BEET_PHMAXLEN; | |
1da177e4 LT |
409 | if (x->encap) { |
410 | struct xfrm_encap_tmpl *encap = x->encap; | |
411 | ||
412 | switch (encap->encap_type) { | |
413 | default: | |
414 | goto error; | |
415 | case UDP_ENCAP_ESPINUDP: | |
416 | x->props.header_len += sizeof(struct udphdr); | |
417 | break; | |
418 | case UDP_ENCAP_ESPINUDP_NON_IKE: | |
419 | x->props.header_len += sizeof(struct udphdr) + 2 * sizeof(u32); | |
420 | break; | |
421 | } | |
422 | } | |
423 | x->data = esp; | |
c5c25238 PM |
424 | align = ALIGN(crypto_blkcipher_blocksize(esp->conf.tfm), 4); |
425 | if (esp->conf.padlen) | |
426 | align = max_t(u32, align, esp->conf.padlen); | |
427 | x->props.trailer_len = align + 1 + esp->auth.icv_trunc_len; | |
1da177e4 LT |
428 | return 0; |
429 | ||
430 | error: | |
431 | x->data = esp; | |
432 | esp_destroy(x); | |
433 | x->data = NULL; | |
434 | return -EINVAL; | |
435 | } | |
436 | ||
437 | static struct xfrm_type esp_type = | |
438 | { | |
439 | .description = "ESP4", | |
440 | .owner = THIS_MODULE, | |
441 | .proto = IPPROTO_ESP, | |
436a0a40 | 442 | .flags = XFRM_TYPE_REPLAY_PROT, |
1da177e4 LT |
443 | .init_state = esp_init_state, |
444 | .destructor = esp_destroy, | |
c5c25238 | 445 | .get_mtu = esp4_get_mtu, |
1da177e4 | 446 | .input = esp_input, |
1da177e4 LT |
447 | .output = esp_output |
448 | }; | |
449 | ||
450 | static struct net_protocol esp4_protocol = { | |
451 | .handler = xfrm4_rcv, | |
452 | .err_handler = esp4_err, | |
453 | .no_policy = 1, | |
454 | }; | |
455 | ||
456 | static int __init esp4_init(void) | |
457 | { | |
1da177e4 LT |
458 | if (xfrm_register_type(&esp_type, AF_INET) < 0) { |
459 | printk(KERN_INFO "ip esp init: can't add xfrm type\n"); | |
460 | return -EAGAIN; | |
461 | } | |
462 | if (inet_add_protocol(&esp4_protocol, IPPROTO_ESP) < 0) { | |
463 | printk(KERN_INFO "ip esp init: can't add protocol\n"); | |
464 | xfrm_unregister_type(&esp_type, AF_INET); | |
465 | return -EAGAIN; | |
466 | } | |
467 | return 0; | |
468 | } | |
469 | ||
470 | static void __exit esp4_fini(void) | |
471 | { | |
472 | if (inet_del_protocol(&esp4_protocol, IPPROTO_ESP) < 0) | |
473 | printk(KERN_INFO "ip esp close: can't remove protocol\n"); | |
474 | if (xfrm_unregister_type(&esp_type, AF_INET) < 0) | |
475 | printk(KERN_INFO "ip esp close: can't remove xfrm type\n"); | |
476 | } | |
477 | ||
478 | module_init(esp4_init); | |
479 | module_exit(esp4_fini); | |
480 | MODULE_LICENSE("GPL"); | |
d3d6dd3a | 481 | MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_ESP); |