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;
144 struct xfrm_offload *xo = xfrm_offload(skb);
146 struct xfrm_state *x;
148 if (xo && (xo->flags & XFRM_DEV_RESUME))
149 x = skb->sp->xvec[skb->sp->len - 1];
151 x = skb_dst(skb)->xfrm;
153 tmp = ESP_SKB_CB(skb)->tmp;
154 esp_ssg_unref(x, tmp);
157 if (xo && (xo->flags & XFRM_DEV_RESUME)) {
159 XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTSTATEPROTOERROR);
164 skb_push(skb, skb->data - skb_mac_header(skb));
166 xfrm_dev_resume(skb);
168 xfrm_output_resume(skb, err);
172 /* Move ESP header back into place. */
173 static void esp_restore_header(struct sk_buff *skb, unsigned int offset)
175 struct ip_esp_hdr *esph = (void *)(skb->data + offset);
176 void *tmp = ESP_SKB_CB(skb)->tmp;
177 __be32 *seqhi = esp_tmp_seqhi(tmp);
179 esph->seq_no = esph->spi;
183 static void esp_output_restore_header(struct sk_buff *skb)
185 esp_restore_header(skb, skb_transport_offset(skb) - sizeof(__be32));
188 static struct ip_esp_hdr *esp_output_set_esn(struct sk_buff *skb,
189 struct xfrm_state *x,
190 struct ip_esp_hdr *esph,
193 /* For ESN we move the header forward by 4 bytes to
194 * accomodate the high bits. We will move it back after
197 if ((x->props.flags & XFRM_STATE_ESN)) {
198 struct xfrm_offload *xo = xfrm_offload(skb);
200 esph = (void *)(skb_transport_header(skb) - sizeof(__be32));
203 esph->seq_no = htonl(xo->seq.hi);
205 esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.hi);
208 esph->spi = x->id.spi;
213 static void esp_output_done_esn(struct crypto_async_request *base, int err)
215 struct sk_buff *skb = base->data;
217 esp_output_restore_header(skb);
218 esp_output_done(base, err);
221 static void esp_output_fill_trailer(u8 *tail, int tfclen, int plen, __u8 proto)
223 /* Fill padding... */
225 memset(tail, 0, tfclen);
230 for (i = 0; i < plen - 2; i++)
233 tail[plen - 2] = plen - 2;
234 tail[plen - 1] = proto;
237 int esp6_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp)
242 struct sk_buff *trailer;
243 int tailen = esp->tailen;
245 if (!skb_cloned(skb)) {
246 if (tailen <= skb_tailroom(skb)) {
249 tail = skb_tail_pointer(trailer);
252 } else if ((skb_shinfo(skb)->nr_frags < MAX_SKB_FRAGS)
253 && !skb_has_frag_list(skb)) {
255 struct sock *sk = skb->sk;
256 struct page_frag *pfrag = &x->xfrag;
258 esp->inplace = false;
260 allocsize = ALIGN(tailen, L1_CACHE_BYTES);
262 spin_lock_bh(&x->lock);
264 if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) {
265 spin_unlock_bh(&x->lock);
272 tail = page_address(page) + pfrag->offset;
274 esp_output_fill_trailer(tail, esp->tfclen, esp->plen, esp->proto);
276 nfrags = skb_shinfo(skb)->nr_frags;
278 __skb_fill_page_desc(skb, nfrags, page, pfrag->offset,
280 skb_shinfo(skb)->nr_frags = ++nfrags;
282 pfrag->offset = pfrag->offset + allocsize;
284 spin_unlock_bh(&x->lock);
289 skb->data_len += tailen;
290 skb->truesize += tailen;
291 if (sk && sk_fullsock(sk))
292 refcount_add(tailen, &sk->sk_wmem_alloc);
299 nfrags = skb_cow_data(skb, tailen, &trailer);
302 tail = skb_tail_pointer(trailer);
305 esp_output_fill_trailer(tail, esp->tfclen, esp->plen, esp->proto);
306 pskb_put(skb, trailer, tailen);
311 EXPORT_SYMBOL_GPL(esp6_output_head);
313 int esp6_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp)
323 struct ip_esp_hdr *esph;
324 struct aead_request *req;
325 struct crypto_aead *aead;
326 struct scatterlist *sg, *dsg;
329 assoclen = sizeof(struct ip_esp_hdr);
332 if (x->props.flags & XFRM_STATE_ESN) {
333 seqhilen += sizeof(__be32);
334 assoclen += sizeof(__be32);
338 alen = crypto_aead_authsize(aead);
339 ivlen = crypto_aead_ivsize(aead);
341 tmp = esp_alloc_tmp(aead, esp->nfrags + 2, seqhilen);
345 seqhi = esp_tmp_seqhi(tmp);
346 iv = esp_tmp_iv(aead, tmp, seqhilen);
347 req = esp_tmp_req(aead, iv);
348 sg = esp_req_sg(aead, req);
353 dsg = &sg[esp->nfrags];
355 esph = esp_output_set_esn(skb, x, ip_esp_hdr(skb), seqhi);
357 sg_init_table(sg, esp->nfrags);
358 err = skb_to_sgvec(skb, sg,
359 (unsigned char *)esph - skb->data,
360 assoclen + ivlen + esp->clen + alen);
361 if (unlikely(err < 0))
366 struct page_frag *pfrag = &x->xfrag;
368 allocsize = ALIGN(skb->data_len, L1_CACHE_BYTES);
370 spin_lock_bh(&x->lock);
371 if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) {
372 spin_unlock_bh(&x->lock);
376 skb_shinfo(skb)->nr_frags = 1;
380 /* replace page frags in skb with new page */
381 __skb_fill_page_desc(skb, 0, page, pfrag->offset, skb->data_len);
382 pfrag->offset = pfrag->offset + allocsize;
383 spin_unlock_bh(&x->lock);
385 sg_init_table(dsg, skb_shinfo(skb)->nr_frags + 1);
386 err = skb_to_sgvec(skb, dsg,
387 (unsigned char *)esph - skb->data,
388 assoclen + ivlen + esp->clen + alen);
389 if (unlikely(err < 0))
393 if ((x->props.flags & XFRM_STATE_ESN))
394 aead_request_set_callback(req, 0, esp_output_done_esn, skb);
396 aead_request_set_callback(req, 0, esp_output_done, skb);
398 aead_request_set_crypt(req, sg, dsg, ivlen + esp->clen, iv);
399 aead_request_set_ad(req, assoclen);
401 memset(iv, 0, ivlen);
402 memcpy(iv + ivlen - min(ivlen, 8), (u8 *)&esp->seqno + 8 - min(ivlen, 8),
405 ESP_SKB_CB(skb)->tmp = tmp;
406 err = crypto_aead_encrypt(req);
417 if ((x->props.flags & XFRM_STATE_ESN))
418 esp_output_restore_header(skb);
422 esp_ssg_unref(x, tmp);
429 EXPORT_SYMBOL_GPL(esp6_output_tail);
431 static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
435 struct ip_esp_hdr *esph;
436 struct crypto_aead *aead;
441 esp.proto = *skb_mac_header(skb);
442 *skb_mac_header(skb) = IPPROTO_ESP;
444 /* skb is pure payload to encrypt */
447 alen = crypto_aead_authsize(aead);
451 struct xfrm_dst *dst = (struct xfrm_dst *)skb_dst(skb);
454 padto = min(x->tfcpad, esp6_get_mtu(x, dst->child_mtu_cached));
455 if (skb->len < padto)
456 esp.tfclen = padto - skb->len;
458 blksize = ALIGN(crypto_aead_blocksize(aead), 4);
459 esp.clen = ALIGN(skb->len + 2 + esp.tfclen, blksize);
460 esp.plen = esp.clen - skb->len - esp.tfclen;
461 esp.tailen = esp.tfclen + esp.plen + alen;
463 esp.nfrags = esp6_output_head(x, skb, &esp);
467 esph = ip_esp_hdr(skb);
468 esph->spi = x->id.spi;
470 esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
471 esp.seqno = cpu_to_be64(XFRM_SKB_CB(skb)->seq.output.low +
472 ((u64)XFRM_SKB_CB(skb)->seq.output.hi << 32));
474 skb_push(skb, -skb_network_offset(skb));
476 return esp6_output_tail(x, skb, &esp);
479 static inline int esp_remove_trailer(struct sk_buff *skb)
481 struct xfrm_state *x = xfrm_input_state(skb);
482 struct xfrm_offload *xo = xfrm_offload(skb);
483 struct crypto_aead *aead = x->data;
484 int alen, hlen, elen;
490 alen = crypto_aead_authsize(aead);
491 hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead);
492 elen = skb->len - hlen;
494 if (xo && (xo->flags & XFRM_ESP_NO_TRAILER)) {
499 ret = skb_copy_bits(skb, skb->len - alen - 2, nexthdr, 2);
504 if (padlen + 2 + alen >= elen) {
505 net_dbg_ratelimited("ipsec esp packet is garbage padlen=%d, elen=%d\n",
506 padlen + 2, elen - alen);
510 trimlen = alen + padlen + 2;
511 if (skb->ip_summed == CHECKSUM_COMPLETE) {
512 csumdiff = skb_checksum(skb, skb->len - trimlen, trimlen, 0);
513 skb->csum = csum_block_sub(skb->csum, csumdiff,
516 pskb_trim(skb, skb->len - trimlen);
524 int esp6_input_done2(struct sk_buff *skb, int err)
526 struct xfrm_state *x = xfrm_input_state(skb);
527 struct xfrm_offload *xo = xfrm_offload(skb);
528 struct crypto_aead *aead = x->data;
529 int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead);
530 int hdr_len = skb_network_header_len(skb);
532 if (!xo || (xo && !(xo->flags & CRYPTO_DONE)))
533 kfree(ESP_SKB_CB(skb)->tmp);
538 err = esp_remove_trailer(skb);
539 if (unlikely(err < 0))
542 skb_postpull_rcsum(skb, skb_network_header(skb),
543 skb_network_header_len(skb));
544 skb_pull_rcsum(skb, hlen);
545 if (x->props.mode == XFRM_MODE_TUNNEL)
546 skb_reset_transport_header(skb);
548 skb_set_transport_header(skb, -hdr_len);
550 /* RFC4303: Drop dummy packets without any error */
551 if (err == IPPROTO_NONE)
557 EXPORT_SYMBOL_GPL(esp6_input_done2);
559 static void esp_input_done(struct crypto_async_request *base, int err)
561 struct sk_buff *skb = base->data;
563 xfrm_input_resume(skb, esp6_input_done2(skb, err));
566 static void esp_input_restore_header(struct sk_buff *skb)
568 esp_restore_header(skb, 0);
572 static void esp_input_set_header(struct sk_buff *skb, __be32 *seqhi)
574 struct xfrm_state *x = xfrm_input_state(skb);
576 /* For ESN we move the header forward by 4 bytes to
577 * accomodate the high bits. We will move it back after
580 if ((x->props.flags & XFRM_STATE_ESN)) {
581 struct ip_esp_hdr *esph = skb_push(skb, 4);
584 esph->spi = esph->seq_no;
585 esph->seq_no = XFRM_SKB_CB(skb)->seq.input.hi;
589 static void esp_input_done_esn(struct crypto_async_request *base, int err)
591 struct sk_buff *skb = base->data;
593 esp_input_restore_header(skb);
594 esp_input_done(base, err);
597 static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
599 struct ip_esp_hdr *esph;
600 struct crypto_aead *aead = x->data;
601 struct aead_request *req;
602 struct sk_buff *trailer;
603 int ivlen = crypto_aead_ivsize(aead);
604 int elen = skb->len - sizeof(*esph) - ivlen;
612 struct scatterlist *sg;
614 if (!pskb_may_pull(skb, sizeof(*esph) + ivlen)) {
624 assoclen = sizeof(*esph);
627 if (x->props.flags & XFRM_STATE_ESN) {
628 seqhilen += sizeof(__be32);
629 assoclen += seqhilen;
632 if (!skb_cloned(skb)) {
633 if (!skb_is_nonlinear(skb)) {
637 } else if (!skb_has_frag_list(skb)) {
638 nfrags = skb_shinfo(skb)->nr_frags;
645 nfrags = skb_cow_data(skb, 0, &trailer);
653 tmp = esp_alloc_tmp(aead, nfrags, seqhilen);
657 ESP_SKB_CB(skb)->tmp = tmp;
658 seqhi = esp_tmp_seqhi(tmp);
659 iv = esp_tmp_iv(aead, tmp, seqhilen);
660 req = esp_tmp_req(aead, iv);
661 sg = esp_req_sg(aead, req);
663 esp_input_set_header(skb, seqhi);
665 sg_init_table(sg, nfrags);
666 ret = skb_to_sgvec(skb, sg, 0, skb->len);
667 if (unlikely(ret < 0)) {
672 skb->ip_summed = CHECKSUM_NONE;
674 if ((x->props.flags & XFRM_STATE_ESN))
675 aead_request_set_callback(req, 0, esp_input_done_esn, skb);
677 aead_request_set_callback(req, 0, esp_input_done, skb);
679 aead_request_set_crypt(req, sg, sg, elen + ivlen, iv);
680 aead_request_set_ad(req, assoclen);
682 ret = crypto_aead_decrypt(req);
683 if (ret == -EINPROGRESS)
686 if ((x->props.flags & XFRM_STATE_ESN))
687 esp_input_restore_header(skb);
689 ret = esp6_input_done2(skb, ret);
695 static u32 esp6_get_mtu(struct xfrm_state *x, int mtu)
697 struct crypto_aead *aead = x->data;
698 u32 blksize = ALIGN(crypto_aead_blocksize(aead), 4);
699 unsigned int net_adj;
701 if (x->props.mode != XFRM_MODE_TUNNEL)
702 net_adj = sizeof(struct ipv6hdr);
706 return ((mtu - x->props.header_len - crypto_aead_authsize(aead) -
707 net_adj) & ~(blksize - 1)) + net_adj - 2;
710 static int esp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
711 u8 type, u8 code, int offset, __be32 info)
713 struct net *net = dev_net(skb->dev);
714 const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
715 struct ip_esp_hdr *esph = (struct ip_esp_hdr *)(skb->data + offset);
716 struct xfrm_state *x;
718 if (type != ICMPV6_PKT_TOOBIG &&
719 type != NDISC_REDIRECT)
722 x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
723 esph->spi, IPPROTO_ESP, AF_INET6);
727 if (type == NDISC_REDIRECT)
728 ip6_redirect(skb, net, skb->dev->ifindex, 0,
729 sock_net_uid(net, NULL));
731 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
737 static void esp6_destroy(struct xfrm_state *x)
739 struct crypto_aead *aead = x->data;
744 crypto_free_aead(aead);
747 static int esp_init_aead(struct xfrm_state *x)
749 char aead_name[CRYPTO_MAX_ALG_NAME];
750 struct crypto_aead *aead;
754 if (snprintf(aead_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
755 x->geniv, x->aead->alg_name) >= CRYPTO_MAX_ALG_NAME)
758 aead = crypto_alloc_aead(aead_name, 0, 0);
765 err = crypto_aead_setkey(aead, x->aead->alg_key,
766 (x->aead->alg_key_len + 7) / 8);
770 err = crypto_aead_setauthsize(aead, x->aead->alg_icv_len / 8);
778 static int esp_init_authenc(struct xfrm_state *x)
780 struct crypto_aead *aead;
781 struct crypto_authenc_key_param *param;
785 char authenc_name[CRYPTO_MAX_ALG_NAME];
795 if ((x->props.flags & XFRM_STATE_ESN)) {
796 if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
797 "%s%sauthencesn(%s,%s)%s",
798 x->geniv ?: "", x->geniv ? "(" : "",
799 x->aalg ? x->aalg->alg_name : "digest_null",
801 x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME)
804 if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
805 "%s%sauthenc(%s,%s)%s",
806 x->geniv ?: "", x->geniv ? "(" : "",
807 x->aalg ? x->aalg->alg_name : "digest_null",
809 x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME)
813 aead = crypto_alloc_aead(authenc_name, 0, 0);
820 keylen = (x->aalg ? (x->aalg->alg_key_len + 7) / 8 : 0) +
821 (x->ealg->alg_key_len + 7) / 8 + RTA_SPACE(sizeof(*param));
823 key = kmalloc(keylen, GFP_KERNEL);
829 rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM;
830 rta->rta_len = RTA_LENGTH(sizeof(*param));
831 param = RTA_DATA(rta);
832 p += RTA_SPACE(sizeof(*param));
835 struct xfrm_algo_desc *aalg_desc;
837 memcpy(p, x->aalg->alg_key, (x->aalg->alg_key_len + 7) / 8);
838 p += (x->aalg->alg_key_len + 7) / 8;
840 aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
844 if (aalg_desc->uinfo.auth.icv_fullbits / 8 !=
845 crypto_aead_authsize(aead)) {
846 pr_info("ESP: %s digestsize %u != %hu\n",
848 crypto_aead_authsize(aead),
849 aalg_desc->uinfo.auth.icv_fullbits / 8);
853 err = crypto_aead_setauthsize(
854 aead, x->aalg->alg_trunc_len / 8);
859 param->enckeylen = cpu_to_be32((x->ealg->alg_key_len + 7) / 8);
860 memcpy(p, x->ealg->alg_key, (x->ealg->alg_key_len + 7) / 8);
862 err = crypto_aead_setkey(aead, key, keylen);
871 static int esp6_init_state(struct xfrm_state *x)
873 struct crypto_aead *aead;
883 err = esp_init_aead(x);
885 err = esp_init_authenc(x);
892 x->props.header_len = sizeof(struct ip_esp_hdr) +
893 crypto_aead_ivsize(aead);
894 switch (x->props.mode) {
896 if (x->sel.family != AF_INET6)
897 x->props.header_len += IPV4_BEET_PHMAXLEN +
898 (sizeof(struct ipv6hdr) - sizeof(struct iphdr));
901 case XFRM_MODE_TRANSPORT:
903 case XFRM_MODE_TUNNEL:
904 x->props.header_len += sizeof(struct ipv6hdr);
908 align = ALIGN(crypto_aead_blocksize(aead), 4);
909 x->props.trailer_len = align + 1 + crypto_aead_authsize(aead);
915 static int esp6_rcv_cb(struct sk_buff *skb, int err)
920 static const struct xfrm_type esp6_type = {
921 .description = "ESP6",
922 .owner = THIS_MODULE,
923 .proto = IPPROTO_ESP,
924 .flags = XFRM_TYPE_REPLAY_PROT,
925 .init_state = esp6_init_state,
926 .destructor = esp6_destroy,
927 .get_mtu = esp6_get_mtu,
929 .output = esp6_output,
930 .hdr_offset = xfrm6_find_1stfragopt,
933 static struct xfrm6_protocol esp6_protocol = {
934 .handler = xfrm6_rcv,
935 .cb_handler = esp6_rcv_cb,
936 .err_handler = esp6_err,
940 static int __init esp6_init(void)
942 if (xfrm_register_type(&esp6_type, AF_INET6) < 0) {
943 pr_info("%s: can't add xfrm type\n", __func__);
946 if (xfrm6_protocol_register(&esp6_protocol, IPPROTO_ESP) < 0) {
947 pr_info("%s: can't add protocol\n", __func__);
948 xfrm_unregister_type(&esp6_type, AF_INET6);
955 static void __exit esp6_fini(void)
957 if (xfrm6_protocol_deregister(&esp6_protocol, IPPROTO_ESP) < 0)
958 pr_info("%s: can't remove protocol\n", __func__);
959 if (xfrm_unregister_type(&esp6_type, AF_INET6) < 0)
960 pr_info("%s: can't remove xfrm type\n", __func__);
963 module_init(esp6_init);
964 module_exit(esp6_fini);
966 MODULE_LICENSE("GPL");
967 MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_ESP);