2 * Copyright (C)2002 USAGI/WIDE Project
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.
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.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, see <http://www.gnu.org/licenses/>.
19 * Mitsuru KANDA @USAGI : IPv6 Support
20 * Kazunori MIYAZAWA @USAGI :
21 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
23 * This file is derived from net/ipv4/esp.c
26 #define pr_fmt(fmt) "IPv6: " fmt
28 #include <crypto/aead.h>
29 #include <crypto/authenc.h>
30 #include <linux/err.h>
31 #include <linux/module.h>
35 #include <linux/scatterlist.h>
36 #include <linux/kernel.h>
37 #include <linux/pfkeyv2.h>
38 #include <linux/random.h>
39 #include <linux/slab.h>
40 #include <linux/spinlock.h>
41 #include <net/ip6_route.h>
44 #include <net/protocol.h>
45 #include <linux/icmpv6.h>
47 #include <linux/highmem.h>
50 struct xfrm_skb_cb xfrm;
54 #define ESP_SKB_CB(__skb) ((struct esp_skb_cb *)&((__skb)->cb[0]))
56 static u32 esp6_get_mtu(struct xfrm_state *x, int mtu);
59 * Allocate an AEAD request structure with extra space for SG and IV.
61 * For alignment considerations the upper 32 bits of the sequence number are
62 * placed at the front, if present. Followed by the IV, the request and finally
65 * TODO: Use spare space in skb for this where possible.
67 static void *esp_alloc_tmp(struct crypto_aead *aead, int nfrags, int seqihlen)
73 len += crypto_aead_ivsize(aead);
76 len += crypto_aead_alignmask(aead) &
77 ~(crypto_tfm_ctx_alignment() - 1);
78 len = ALIGN(len, crypto_tfm_ctx_alignment());
81 len += sizeof(struct aead_request) + crypto_aead_reqsize(aead);
82 len = ALIGN(len, __alignof__(struct scatterlist));
84 len += sizeof(struct scatterlist) * nfrags;
86 return kmalloc(len, GFP_ATOMIC);
89 static inline __be32 *esp_tmp_seqhi(void *tmp)
91 return PTR_ALIGN((__be32 *)tmp, __alignof__(__be32));
94 static inline u8 *esp_tmp_iv(struct crypto_aead *aead, void *tmp, int seqhilen)
96 return crypto_aead_ivsize(aead) ?
97 PTR_ALIGN((u8 *)tmp + seqhilen,
98 crypto_aead_alignmask(aead) + 1) : tmp + seqhilen;
101 static inline struct aead_request *esp_tmp_req(struct crypto_aead *aead, u8 *iv)
103 struct aead_request *req;
105 req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead),
106 crypto_tfm_ctx_alignment());
107 aead_request_set_tfm(req, aead);
111 static inline struct scatterlist *esp_req_sg(struct crypto_aead *aead,
112 struct aead_request *req)
114 return (void *)ALIGN((unsigned long)(req + 1) +
115 crypto_aead_reqsize(aead),
116 __alignof__(struct scatterlist));
119 static void esp_ssg_unref(struct xfrm_state *x, void *tmp)
121 struct crypto_aead *aead = x->data;
124 struct aead_request *req;
125 struct scatterlist *sg;
127 if (x->props.flags & XFRM_STATE_ESN)
128 seqhilen += sizeof(__be32);
130 iv = esp_tmp_iv(aead, tmp, seqhilen);
131 req = esp_tmp_req(aead, iv);
133 /* Unref skb_frag_pages in the src scatterlist if necessary.
134 * Skip the first sg which comes from skb->data.
136 if (req->src != req->dst)
137 for (sg = sg_next(req->src); sg; sg = sg_next(sg))
138 put_page(sg_page(sg));
141 static void esp_output_done(struct crypto_async_request *base, int err)
143 struct sk_buff *skb = base->data;
145 struct dst_entry *dst = skb_dst(skb);
146 struct xfrm_state *x = dst->xfrm;
148 tmp = ESP_SKB_CB(skb)->tmp;
149 esp_ssg_unref(x, tmp);
151 xfrm_output_resume(skb, err);
154 /* Move ESP header back into place. */
155 static void esp_restore_header(struct sk_buff *skb, unsigned int offset)
157 struct ip_esp_hdr *esph = (void *)(skb->data + offset);
158 void *tmp = ESP_SKB_CB(skb)->tmp;
159 __be32 *seqhi = esp_tmp_seqhi(tmp);
161 esph->seq_no = esph->spi;
165 static void esp_output_restore_header(struct sk_buff *skb)
167 esp_restore_header(skb, skb_transport_offset(skb) - sizeof(__be32));
170 static struct ip_esp_hdr *esp_output_set_esn(struct sk_buff *skb,
171 struct xfrm_state *x,
172 struct ip_esp_hdr *esph,
175 /* For ESN we move the header forward by 4 bytes to
176 * accomodate the high bits. We will move it back after
179 if ((x->props.flags & XFRM_STATE_ESN)) {
180 struct xfrm_offload *xo = xfrm_offload(skb);
182 esph = (void *)(skb_transport_header(skb) - sizeof(__be32));
185 esph->seq_no = htonl(xo->seq.hi);
187 esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.hi);
190 esph->spi = x->id.spi;
195 static void esp_output_done_esn(struct crypto_async_request *base, int err)
197 struct sk_buff *skb = base->data;
199 esp_output_restore_header(skb);
200 esp_output_done(base, err);
203 static void esp_output_fill_trailer(u8 *tail, int tfclen, int plen, __u8 proto)
205 /* Fill padding... */
207 memset(tail, 0, tfclen);
212 for (i = 0; i < plen - 2; i++)
215 tail[plen - 2] = plen - 2;
216 tail[plen - 1] = proto;
219 int esp6_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp)
224 struct sk_buff *trailer;
225 int tailen = esp->tailen;
227 if (!skb_cloned(skb)) {
228 if (tailen <= skb_tailroom(skb)) {
231 tail = skb_tail_pointer(trailer);
234 } else if ((skb_shinfo(skb)->nr_frags < MAX_SKB_FRAGS)
235 && !skb_has_frag_list(skb)) {
237 struct sock *sk = skb->sk;
238 struct page_frag *pfrag = &x->xfrag;
240 esp->inplace = false;
242 allocsize = ALIGN(tailen, L1_CACHE_BYTES);
244 spin_lock_bh(&x->lock);
246 if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) {
247 spin_unlock_bh(&x->lock);
254 tail = page_address(page) + pfrag->offset;
256 esp_output_fill_trailer(tail, esp->tfclen, esp->plen, esp->proto);
258 nfrags = skb_shinfo(skb)->nr_frags;
260 __skb_fill_page_desc(skb, nfrags, page, pfrag->offset,
262 skb_shinfo(skb)->nr_frags = ++nfrags;
264 pfrag->offset = pfrag->offset + allocsize;
266 spin_unlock_bh(&x->lock);
271 skb->data_len += tailen;
272 skb->truesize += tailen;
273 if (sk && sk_fullsock(sk))
274 refcount_add(tailen, &sk->sk_wmem_alloc);
281 nfrags = skb_cow_data(skb, tailen, &trailer);
284 tail = skb_tail_pointer(trailer);
287 esp_output_fill_trailer(tail, esp->tfclen, esp->plen, esp->proto);
288 pskb_put(skb, trailer, tailen);
293 EXPORT_SYMBOL_GPL(esp6_output_head);
295 int esp6_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp)
305 struct ip_esp_hdr *esph;
306 struct aead_request *req;
307 struct crypto_aead *aead;
308 struct scatterlist *sg, *dsg;
311 assoclen = sizeof(struct ip_esp_hdr);
314 if (x->props.flags & XFRM_STATE_ESN) {
315 seqhilen += sizeof(__be32);
316 assoclen += sizeof(__be32);
320 alen = crypto_aead_authsize(aead);
321 ivlen = crypto_aead_ivsize(aead);
323 tmp = esp_alloc_tmp(aead, esp->nfrags + 2, seqhilen);
327 seqhi = esp_tmp_seqhi(tmp);
328 iv = esp_tmp_iv(aead, tmp, seqhilen);
329 req = esp_tmp_req(aead, iv);
330 sg = esp_req_sg(aead, req);
335 dsg = &sg[esp->nfrags];
337 esph = esp_output_set_esn(skb, x, ip_esp_hdr(skb), seqhi);
339 sg_init_table(sg, esp->nfrags);
340 err = skb_to_sgvec(skb, sg,
341 (unsigned char *)esph - skb->data,
342 assoclen + ivlen + esp->clen + alen);
343 if (unlikely(err < 0))
348 struct page_frag *pfrag = &x->xfrag;
350 allocsize = ALIGN(skb->data_len, L1_CACHE_BYTES);
352 spin_lock_bh(&x->lock);
353 if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) {
354 spin_unlock_bh(&x->lock);
358 skb_shinfo(skb)->nr_frags = 1;
362 /* replace page frags in skb with new page */
363 __skb_fill_page_desc(skb, 0, page, pfrag->offset, skb->data_len);
364 pfrag->offset = pfrag->offset + allocsize;
365 spin_unlock_bh(&x->lock);
367 sg_init_table(dsg, skb_shinfo(skb)->nr_frags + 1);
368 err = skb_to_sgvec(skb, dsg,
369 (unsigned char *)esph - skb->data,
370 assoclen + ivlen + esp->clen + alen);
371 if (unlikely(err < 0))
375 if ((x->props.flags & XFRM_STATE_ESN))
376 aead_request_set_callback(req, 0, esp_output_done_esn, skb);
378 aead_request_set_callback(req, 0, esp_output_done, skb);
380 aead_request_set_crypt(req, sg, dsg, ivlen + esp->clen, iv);
381 aead_request_set_ad(req, assoclen);
383 memset(iv, 0, ivlen);
384 memcpy(iv + ivlen - min(ivlen, 8), (u8 *)&esp->seqno + 8 - min(ivlen, 8),
387 ESP_SKB_CB(skb)->tmp = tmp;
388 err = crypto_aead_encrypt(req);
399 if ((x->props.flags & XFRM_STATE_ESN))
400 esp_output_restore_header(skb);
404 esp_ssg_unref(x, tmp);
411 EXPORT_SYMBOL_GPL(esp6_output_tail);
413 static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
417 struct ip_esp_hdr *esph;
418 struct crypto_aead *aead;
423 esp.proto = *skb_mac_header(skb);
424 *skb_mac_header(skb) = IPPROTO_ESP;
426 /* skb is pure payload to encrypt */
429 alen = crypto_aead_authsize(aead);
433 struct xfrm_dst *dst = (struct xfrm_dst *)skb_dst(skb);
436 padto = min(x->tfcpad, esp6_get_mtu(x, dst->child_mtu_cached));
437 if (skb->len < padto)
438 esp.tfclen = padto - skb->len;
440 blksize = ALIGN(crypto_aead_blocksize(aead), 4);
441 esp.clen = ALIGN(skb->len + 2 + esp.tfclen, blksize);
442 esp.plen = esp.clen - skb->len - esp.tfclen;
443 esp.tailen = esp.tfclen + esp.plen + alen;
445 esp.nfrags = esp6_output_head(x, skb, &esp);
449 esph = ip_esp_hdr(skb);
450 esph->spi = x->id.spi;
452 esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
453 esp.seqno = cpu_to_be64(XFRM_SKB_CB(skb)->seq.output.low +
454 ((u64)XFRM_SKB_CB(skb)->seq.output.hi << 32));
456 skb_push(skb, -skb_network_offset(skb));
458 return esp6_output_tail(x, skb, &esp);
461 static inline int esp_remove_trailer(struct sk_buff *skb)
463 struct xfrm_state *x = xfrm_input_state(skb);
464 struct xfrm_offload *xo = xfrm_offload(skb);
465 struct crypto_aead *aead = x->data;
466 int alen, hlen, elen;
472 alen = crypto_aead_authsize(aead);
473 hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead);
474 elen = skb->len - hlen;
476 if (xo && (xo->flags & XFRM_ESP_NO_TRAILER)) {
481 if (skb_copy_bits(skb, skb->len - alen - 2, nexthdr, 2))
486 if (padlen + 2 + alen >= elen) {
487 net_dbg_ratelimited("ipsec esp packet is garbage padlen=%d, elen=%d\n",
488 padlen + 2, elen - alen);
492 trimlen = alen + padlen + 2;
493 if (skb->ip_summed == CHECKSUM_COMPLETE) {
494 csumdiff = skb_checksum(skb, skb->len - trimlen, trimlen, 0);
495 skb->csum = csum_block_sub(skb->csum, csumdiff,
498 pskb_trim(skb, skb->len - trimlen);
506 int esp6_input_done2(struct sk_buff *skb, int err)
508 struct xfrm_state *x = xfrm_input_state(skb);
509 struct xfrm_offload *xo = xfrm_offload(skb);
510 struct crypto_aead *aead = x->data;
511 int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead);
512 int hdr_len = skb_network_header_len(skb);
514 if (!xo || (xo && !(xo->flags & CRYPTO_DONE)))
515 kfree(ESP_SKB_CB(skb)->tmp);
520 err = esp_remove_trailer(skb);
521 if (unlikely(err < 0))
524 skb_postpull_rcsum(skb, skb_network_header(skb),
525 skb_network_header_len(skb));
526 skb_pull_rcsum(skb, hlen);
527 if (x->props.mode == XFRM_MODE_TUNNEL)
528 skb_reset_transport_header(skb);
530 skb_set_transport_header(skb, -hdr_len);
532 /* RFC4303: Drop dummy packets without any error */
533 if (err == IPPROTO_NONE)
539 EXPORT_SYMBOL_GPL(esp6_input_done2);
541 static void esp_input_done(struct crypto_async_request *base, int err)
543 struct sk_buff *skb = base->data;
545 xfrm_input_resume(skb, esp6_input_done2(skb, err));
548 static void esp_input_restore_header(struct sk_buff *skb)
550 esp_restore_header(skb, 0);
554 static void esp_input_set_header(struct sk_buff *skb, __be32 *seqhi)
556 struct xfrm_state *x = xfrm_input_state(skb);
557 struct ip_esp_hdr *esph = (struct ip_esp_hdr *)skb->data;
559 /* For ESN we move the header forward by 4 bytes to
560 * accomodate the high bits. We will move it back after
563 if ((x->props.flags & XFRM_STATE_ESN)) {
564 esph = skb_push(skb, 4);
566 esph->spi = esph->seq_no;
567 esph->seq_no = XFRM_SKB_CB(skb)->seq.input.hi;
571 static void esp_input_done_esn(struct crypto_async_request *base, int err)
573 struct sk_buff *skb = base->data;
575 esp_input_restore_header(skb);
576 esp_input_done(base, err);
579 static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
581 struct ip_esp_hdr *esph;
582 struct crypto_aead *aead = x->data;
583 struct aead_request *req;
584 struct sk_buff *trailer;
585 int ivlen = crypto_aead_ivsize(aead);
586 int elen = skb->len - sizeof(*esph) - ivlen;
594 struct scatterlist *sg;
596 if (!pskb_may_pull(skb, sizeof(*esph) + ivlen)) {
606 assoclen = sizeof(*esph);
609 if (x->props.flags & XFRM_STATE_ESN) {
610 seqhilen += sizeof(__be32);
611 assoclen += seqhilen;
614 if (!skb_cloned(skb)) {
615 if (!skb_is_nonlinear(skb)) {
619 } else if (!skb_has_frag_list(skb)) {
620 nfrags = skb_shinfo(skb)->nr_frags;
627 nfrags = skb_cow_data(skb, 0, &trailer);
635 tmp = esp_alloc_tmp(aead, nfrags, seqhilen);
639 ESP_SKB_CB(skb)->tmp = tmp;
640 seqhi = esp_tmp_seqhi(tmp);
641 iv = esp_tmp_iv(aead, tmp, seqhilen);
642 req = esp_tmp_req(aead, iv);
643 sg = esp_req_sg(aead, req);
645 esp_input_set_header(skb, seqhi);
647 sg_init_table(sg, nfrags);
648 ret = skb_to_sgvec(skb, sg, 0, skb->len);
649 if (unlikely(ret < 0)) {
654 skb->ip_summed = CHECKSUM_NONE;
656 if ((x->props.flags & XFRM_STATE_ESN))
657 aead_request_set_callback(req, 0, esp_input_done_esn, skb);
659 aead_request_set_callback(req, 0, esp_input_done, skb);
661 aead_request_set_crypt(req, sg, sg, elen + ivlen, iv);
662 aead_request_set_ad(req, assoclen);
664 ret = crypto_aead_decrypt(req);
665 if (ret == -EINPROGRESS)
668 if ((x->props.flags & XFRM_STATE_ESN))
669 esp_input_restore_header(skb);
671 ret = esp6_input_done2(skb, ret);
677 static u32 esp6_get_mtu(struct xfrm_state *x, int mtu)
679 struct crypto_aead *aead = x->data;
680 u32 blksize = ALIGN(crypto_aead_blocksize(aead), 4);
681 unsigned int net_adj;
683 if (x->props.mode != XFRM_MODE_TUNNEL)
684 net_adj = sizeof(struct ipv6hdr);
688 return ((mtu - x->props.header_len - crypto_aead_authsize(aead) -
689 net_adj) & ~(blksize - 1)) + net_adj - 2;
692 static int esp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
693 u8 type, u8 code, int offset, __be32 info)
695 struct net *net = dev_net(skb->dev);
696 const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
697 struct ip_esp_hdr *esph = (struct ip_esp_hdr *)(skb->data + offset);
698 struct xfrm_state *x;
700 if (type != ICMPV6_PKT_TOOBIG &&
701 type != NDISC_REDIRECT)
704 x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
705 esph->spi, IPPROTO_ESP, AF_INET6);
709 if (type == NDISC_REDIRECT)
710 ip6_redirect(skb, net, skb->dev->ifindex, 0,
711 sock_net_uid(net, NULL));
713 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
719 static void esp6_destroy(struct xfrm_state *x)
721 struct crypto_aead *aead = x->data;
726 crypto_free_aead(aead);
729 static int esp_init_aead(struct xfrm_state *x)
731 char aead_name[CRYPTO_MAX_ALG_NAME];
732 struct crypto_aead *aead;
737 if (snprintf(aead_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
738 x->geniv, x->aead->alg_name) >= CRYPTO_MAX_ALG_NAME)
741 if (x->xso.offload_handle)
742 mask |= CRYPTO_ALG_ASYNC;
744 aead = crypto_alloc_aead(aead_name, 0, mask);
751 err = crypto_aead_setkey(aead, x->aead->alg_key,
752 (x->aead->alg_key_len + 7) / 8);
756 err = crypto_aead_setauthsize(aead, x->aead->alg_icv_len / 8);
764 static int esp_init_authenc(struct xfrm_state *x)
766 struct crypto_aead *aead;
767 struct crypto_authenc_key_param *param;
771 char authenc_name[CRYPTO_MAX_ALG_NAME];
782 if ((x->props.flags & XFRM_STATE_ESN)) {
783 if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
784 "%s%sauthencesn(%s,%s)%s",
785 x->geniv ?: "", x->geniv ? "(" : "",
786 x->aalg ? x->aalg->alg_name : "digest_null",
788 x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME)
791 if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
792 "%s%sauthenc(%s,%s)%s",
793 x->geniv ?: "", x->geniv ? "(" : "",
794 x->aalg ? x->aalg->alg_name : "digest_null",
796 x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME)
800 if (x->xso.offload_handle)
801 mask |= CRYPTO_ALG_ASYNC;
803 aead = crypto_alloc_aead(authenc_name, 0, mask);
810 keylen = (x->aalg ? (x->aalg->alg_key_len + 7) / 8 : 0) +
811 (x->ealg->alg_key_len + 7) / 8 + RTA_SPACE(sizeof(*param));
813 key = kmalloc(keylen, GFP_KERNEL);
819 rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM;
820 rta->rta_len = RTA_LENGTH(sizeof(*param));
821 param = RTA_DATA(rta);
822 p += RTA_SPACE(sizeof(*param));
825 struct xfrm_algo_desc *aalg_desc;
827 memcpy(p, x->aalg->alg_key, (x->aalg->alg_key_len + 7) / 8);
828 p += (x->aalg->alg_key_len + 7) / 8;
830 aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
834 if (aalg_desc->uinfo.auth.icv_fullbits / 8 !=
835 crypto_aead_authsize(aead)) {
836 pr_info("ESP: %s digestsize %u != %hu\n",
838 crypto_aead_authsize(aead),
839 aalg_desc->uinfo.auth.icv_fullbits / 8);
843 err = crypto_aead_setauthsize(
844 aead, x->aalg->alg_trunc_len / 8);
849 param->enckeylen = cpu_to_be32((x->ealg->alg_key_len + 7) / 8);
850 memcpy(p, x->ealg->alg_key, (x->ealg->alg_key_len + 7) / 8);
852 err = crypto_aead_setkey(aead, key, keylen);
861 static int esp6_init_state(struct xfrm_state *x)
863 struct crypto_aead *aead;
873 err = esp_init_aead(x);
875 err = esp_init_authenc(x);
882 x->props.header_len = sizeof(struct ip_esp_hdr) +
883 crypto_aead_ivsize(aead);
884 switch (x->props.mode) {
886 if (x->sel.family != AF_INET6)
887 x->props.header_len += IPV4_BEET_PHMAXLEN +
888 (sizeof(struct ipv6hdr) - sizeof(struct iphdr));
890 case XFRM_MODE_TRANSPORT:
892 case XFRM_MODE_TUNNEL:
893 x->props.header_len += sizeof(struct ipv6hdr);
899 align = ALIGN(crypto_aead_blocksize(aead), 4);
900 x->props.trailer_len = align + 1 + crypto_aead_authsize(aead);
906 static int esp6_rcv_cb(struct sk_buff *skb, int err)
911 static const struct xfrm_type esp6_type = {
912 .description = "ESP6",
913 .owner = THIS_MODULE,
914 .proto = IPPROTO_ESP,
915 .flags = XFRM_TYPE_REPLAY_PROT,
916 .init_state = esp6_init_state,
917 .destructor = esp6_destroy,
918 .get_mtu = esp6_get_mtu,
920 .output = esp6_output,
921 .hdr_offset = xfrm6_find_1stfragopt,
924 static struct xfrm6_protocol esp6_protocol = {
925 .handler = xfrm6_rcv,
926 .cb_handler = esp6_rcv_cb,
927 .err_handler = esp6_err,
931 static int __init esp6_init(void)
933 if (xfrm_register_type(&esp6_type, AF_INET6) < 0) {
934 pr_info("%s: can't add xfrm type\n", __func__);
937 if (xfrm6_protocol_register(&esp6_protocol, IPPROTO_ESP) < 0) {
938 pr_info("%s: can't add protocol\n", __func__);
939 xfrm_unregister_type(&esp6_type, AF_INET6);
946 static void __exit esp6_fini(void)
948 if (xfrm6_protocol_deregister(&esp6_protocol, IPPROTO_ESP) < 0)
949 pr_info("%s: can't remove protocol\n", __func__);
950 if (xfrm_unregister_type(&esp6_type, AF_INET6) < 0)
951 pr_info("%s: can't remove xfrm type\n", __func__);
954 module_init(esp6_init);
955 module_exit(esp6_fini);
957 MODULE_LICENSE("GPL");
958 MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_ESP);