1 #define pr_fmt(fmt) "IPsec: " fmt
3 #include <crypto/aead.h>
4 #include <crypto/authenc.h>
6 #include <linux/module.h>
10 #include <linux/scatterlist.h>
11 #include <linux/kernel.h>
12 #include <linux/pfkeyv2.h>
13 #include <linux/rtnetlink.h>
14 #include <linux/slab.h>
15 #include <linux/spinlock.h>
16 #include <linux/in6.h>
18 #include <net/protocol.h>
21 #include <linux/highmem.h>
24 struct xfrm_skb_cb xfrm;
28 struct esp_output_extra {
33 #define ESP_SKB_CB(__skb) ((struct esp_skb_cb *)&((__skb)->cb[0]))
35 static u32 esp4_get_mtu(struct xfrm_state *x, int mtu);
38 * Allocate an AEAD request structure with extra space for SG and IV.
40 * For alignment considerations the IV is placed at the front, followed
41 * by the request and finally the SG list.
43 * TODO: Use spare space in skb for this where possible.
45 static void *esp_alloc_tmp(struct crypto_aead *aead, int nfrags, int extralen)
51 len += crypto_aead_ivsize(aead);
54 len += crypto_aead_alignmask(aead) &
55 ~(crypto_tfm_ctx_alignment() - 1);
56 len = ALIGN(len, crypto_tfm_ctx_alignment());
59 len += sizeof(struct aead_request) + crypto_aead_reqsize(aead);
60 len = ALIGN(len, __alignof__(struct scatterlist));
62 len += sizeof(struct scatterlist) * nfrags;
64 return kmalloc(len, GFP_ATOMIC);
67 static inline void *esp_tmp_extra(void *tmp)
69 return PTR_ALIGN(tmp, __alignof__(struct esp_output_extra));
72 static inline u8 *esp_tmp_iv(struct crypto_aead *aead, void *tmp, int extralen)
74 return crypto_aead_ivsize(aead) ?
75 PTR_ALIGN((u8 *)tmp + extralen,
76 crypto_aead_alignmask(aead) + 1) : tmp + extralen;
79 static inline struct aead_request *esp_tmp_req(struct crypto_aead *aead, u8 *iv)
81 struct aead_request *req;
83 req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead),
84 crypto_tfm_ctx_alignment());
85 aead_request_set_tfm(req, aead);
89 static inline struct scatterlist *esp_req_sg(struct crypto_aead *aead,
90 struct aead_request *req)
92 return (void *)ALIGN((unsigned long)(req + 1) +
93 crypto_aead_reqsize(aead),
94 __alignof__(struct scatterlist));
97 static void esp_ssg_unref(struct xfrm_state *x, void *tmp)
99 struct esp_output_extra *extra = esp_tmp_extra(tmp);
100 struct crypto_aead *aead = x->data;
103 struct aead_request *req;
104 struct scatterlist *sg;
106 if (x->props.flags & XFRM_STATE_ESN)
107 extralen += sizeof(*extra);
109 extra = esp_tmp_extra(tmp);
110 iv = esp_tmp_iv(aead, tmp, extralen);
111 req = esp_tmp_req(aead, iv);
113 /* Unref skb_frag_pages in the src scatterlist if necessary.
114 * Skip the first sg which comes from skb->data.
116 if (req->src != req->dst)
117 for (sg = sg_next(req->src); sg; sg = sg_next(sg))
118 put_page(sg_page(sg));
121 static void esp_output_done(struct crypto_async_request *base, int err)
123 struct sk_buff *skb = base->data;
125 struct dst_entry *dst = skb_dst(skb);
126 struct xfrm_state *x = dst->xfrm;
128 tmp = ESP_SKB_CB(skb)->tmp;
129 esp_ssg_unref(x, tmp);
131 xfrm_output_resume(skb, err);
134 /* Move ESP header back into place. */
135 static void esp_restore_header(struct sk_buff *skb, unsigned int offset)
137 struct ip_esp_hdr *esph = (void *)(skb->data + offset);
138 void *tmp = ESP_SKB_CB(skb)->tmp;
139 __be32 *seqhi = esp_tmp_extra(tmp);
141 esph->seq_no = esph->spi;
145 static void esp_output_restore_header(struct sk_buff *skb)
147 void *tmp = ESP_SKB_CB(skb)->tmp;
148 struct esp_output_extra *extra = esp_tmp_extra(tmp);
150 esp_restore_header(skb, skb_transport_offset(skb) + extra->esphoff -
154 static struct ip_esp_hdr *esp_output_set_extra(struct sk_buff *skb,
155 struct ip_esp_hdr *esph,
156 struct esp_output_extra *extra)
158 struct xfrm_state *x = skb_dst(skb)->xfrm;
160 /* For ESN we move the header forward by 4 bytes to
161 * accomodate the high bits. We will move it back after
164 if ((x->props.flags & XFRM_STATE_ESN)) {
165 extra->esphoff = (unsigned char *)esph -
166 skb_transport_header(skb);
167 esph = (struct ip_esp_hdr *)((unsigned char *)esph - 4);
168 extra->seqhi = esph->spi;
169 esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.hi);
172 esph->spi = x->id.spi;
177 static void esp_output_done_esn(struct crypto_async_request *base, int err)
179 struct sk_buff *skb = base->data;
181 esp_output_restore_header(skb);
182 esp_output_done(base, err);
185 static void esp_output_fill_trailer(u8 *tail, int tfclen, int plen, __u8 proto)
187 /* Fill padding... */
189 memset(tail, 0, tfclen);
194 for (i = 0; i < plen - 2; i++)
197 tail[plen - 2] = plen - 2;
198 tail[plen - 1] = proto;
201 static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
203 struct esp_output_extra *extra;
205 struct ip_esp_hdr *esph;
206 struct crypto_aead *aead;
207 struct aead_request *req;
208 struct scatterlist *sg, *dsg;
209 struct sk_buff *trailer;
226 __u8 proto = *skb_mac_header(skb);
228 /* skb is pure payload to encrypt */
231 alen = crypto_aead_authsize(aead);
232 ivlen = crypto_aead_ivsize(aead);
236 struct xfrm_dst *dst = (struct xfrm_dst *)skb_dst(skb);
239 padto = min(x->tfcpad, esp4_get_mtu(x, dst->child_mtu_cached));
240 if (skb->len < padto)
241 tfclen = padto - skb->len;
243 blksize = ALIGN(crypto_aead_blocksize(aead), 4);
244 clen = ALIGN(skb->len + 2 + tfclen, blksize);
245 plen = clen - skb->len - tfclen;
246 tailen = tfclen + plen + alen;
247 assoclen = sizeof(*esph);
250 if (x->props.flags & XFRM_STATE_ESN) {
251 extralen += sizeof(*extra);
252 assoclen += sizeof(__be32);
255 *skb_mac_header(skb) = IPPROTO_ESP;
256 esph = ip_esp_hdr(skb);
258 /* this is non-NULL only with UDP Encapsulation */
260 struct xfrm_encap_tmpl *encap = x->encap;
266 spin_lock_bh(&x->lock);
267 sport = encap->encap_sport;
268 dport = encap->encap_dport;
269 encap_type = encap->encap_type;
270 spin_unlock_bh(&x->lock);
272 uh = (struct udphdr *)esph;
275 uh->len = htons(skb->len + tailen
276 - skb_transport_offset(skb));
279 switch (encap_type) {
281 case UDP_ENCAP_ESPINUDP:
282 esph = (struct ip_esp_hdr *)(uh + 1);
284 case UDP_ENCAP_ESPINUDP_NON_IKE:
285 udpdata32 = (__be32 *)(uh + 1);
286 udpdata32[0] = udpdata32[1] = 0;
287 esph = (struct ip_esp_hdr *)(udpdata32 + 2);
291 *skb_mac_header(skb) = IPPROTO_UDP;
294 if (!skb_cloned(skb)) {
295 if (tailen <= skb_availroom(skb)) {
298 tail = skb_tail_pointer(trailer);
301 } else if ((skb_shinfo(skb)->nr_frags < MAX_SKB_FRAGS)
302 && !skb_has_frag_list(skb)) {
304 struct sock *sk = skb->sk;
305 struct page_frag *pfrag = &x->xfrag;
307 allocsize = ALIGN(tailen, L1_CACHE_BYTES);
309 spin_lock_bh(&x->lock);
311 if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) {
312 spin_unlock_bh(&x->lock);
319 vaddr = kmap_atomic(page);
321 tail = vaddr + pfrag->offset;
323 esp_output_fill_trailer(tail, tfclen, plen, proto);
325 kunmap_atomic(vaddr);
327 nfrags = skb_shinfo(skb)->nr_frags;
329 __skb_fill_page_desc(skb, nfrags, page, pfrag->offset,
331 skb_shinfo(skb)->nr_frags = ++nfrags;
333 pfrag->offset = pfrag->offset + allocsize;
337 skb->data_len += tailen;
338 skb->truesize += tailen;
340 atomic_add(tailen, &sk->sk_wmem_alloc);
342 skb_push(skb, -skb_network_offset(skb));
344 esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
345 esph->spi = x->id.spi;
347 tmp = esp_alloc_tmp(aead, nfrags + 2, extralen);
349 spin_unlock_bh(&x->lock);
354 extra = esp_tmp_extra(tmp);
355 iv = esp_tmp_iv(aead, tmp, extralen);
356 req = esp_tmp_req(aead, iv);
357 sg = esp_req_sg(aead, req);
360 esph = esp_output_set_extra(skb, esph, extra);
362 sg_init_table(sg, nfrags);
363 skb_to_sgvec(skb, sg,
364 (unsigned char *)esph - skb->data,
365 assoclen + ivlen + clen + alen);
367 allocsize = ALIGN(skb->data_len, L1_CACHE_BYTES);
369 if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) {
370 spin_unlock_bh(&x->lock);
375 skb_shinfo(skb)->nr_frags = 1;
379 /* replace page frags in skb with new page */
380 __skb_fill_page_desc(skb, 0, page, pfrag->offset, skb->data_len);
381 pfrag->offset = pfrag->offset + allocsize;
383 sg_init_table(dsg, skb_shinfo(skb)->nr_frags + 1);
384 skb_to_sgvec(skb, dsg,
385 (unsigned char *)esph - skb->data,
386 assoclen + ivlen + clen + alen);
388 spin_unlock_bh(&x->lock);
395 err = skb_cow_data(skb, tailen, &trailer);
399 tail = skb_tail_pointer(trailer);
400 esph = ip_esp_hdr(skb);
403 esp_output_fill_trailer(tail, tfclen, plen, proto);
405 pskb_put(skb, trailer, clen - skb->len + alen);
406 skb_push(skb, -skb_network_offset(skb));
407 esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
408 esph->spi = x->id.spi;
410 tmp = esp_alloc_tmp(aead, nfrags, extralen);
416 extra = esp_tmp_extra(tmp);
417 iv = esp_tmp_iv(aead, tmp, extralen);
418 req = esp_tmp_req(aead, iv);
419 sg = esp_req_sg(aead, req);
422 esph = esp_output_set_extra(skb, esph, extra);
424 sg_init_table(sg, nfrags);
425 skb_to_sgvec(skb, sg,
426 (unsigned char *)esph - skb->data,
427 assoclen + ivlen + clen + alen);
430 if ((x->props.flags & XFRM_STATE_ESN))
431 aead_request_set_callback(req, 0, esp_output_done_esn, skb);
433 aead_request_set_callback(req, 0, esp_output_done, skb);
435 aead_request_set_crypt(req, sg, dsg, ivlen + clen, iv);
436 aead_request_set_ad(req, assoclen);
438 seqno = cpu_to_be64(XFRM_SKB_CB(skb)->seq.output.low +
439 ((u64)XFRM_SKB_CB(skb)->seq.output.hi << 32));
441 memset(iv, 0, ivlen);
442 memcpy(iv + ivlen - min(ivlen, 8), (u8 *)&seqno + 8 - min(ivlen, 8),
445 ESP_SKB_CB(skb)->tmp = tmp;
446 err = crypto_aead_encrypt(req);
457 if ((x->props.flags & XFRM_STATE_ESN))
458 esp_output_restore_header(skb);
462 esp_ssg_unref(x, tmp);
469 static int esp_input_done2(struct sk_buff *skb, int err)
471 const struct iphdr *iph;
472 struct xfrm_state *x = xfrm_input_state(skb);
473 struct crypto_aead *aead = x->data;
474 int alen = crypto_aead_authsize(aead);
475 int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead);
476 int elen = skb->len - hlen;
481 kfree(ESP_SKB_CB(skb)->tmp);
486 if (skb_copy_bits(skb, skb->len-alen-2, nexthdr, 2))
491 if (padlen + 2 + alen >= elen)
494 /* ... check padding bits here. Silly. :-) */
500 struct xfrm_encap_tmpl *encap = x->encap;
501 struct udphdr *uh = (void *)(skb_network_header(skb) + ihl);
504 * 1) if the NAT-T peer's IP or port changed then
505 * advertize the change to the keying daemon.
506 * This is an inbound SA, so just compare
509 if (iph->saddr != x->props.saddr.a4 ||
510 uh->source != encap->encap_sport) {
511 xfrm_address_t ipaddr;
513 ipaddr.a4 = iph->saddr;
514 km_new_mapping(x, &ipaddr, uh->source);
516 /* XXX: perhaps add an extra
517 * policy check here, to see
518 * if we should allow or
519 * reject a packet from a
526 * 2) ignore UDP/TCP checksums in case
527 * of NAT-T in Transport Mode, or
528 * perform other post-processing fixes
529 * as per draft-ietf-ipsec-udp-encaps-06,
532 if (x->props.mode == XFRM_MODE_TRANSPORT)
533 skb->ip_summed = CHECKSUM_UNNECESSARY;
536 pskb_trim(skb, skb->len - alen - padlen - 2);
537 __skb_pull(skb, hlen);
538 if (x->props.mode == XFRM_MODE_TUNNEL)
539 skb_reset_transport_header(skb);
541 skb_set_transport_header(skb, -ihl);
545 /* RFC4303: Drop dummy packets without any error */
546 if (err == IPPROTO_NONE)
553 static void esp_input_done(struct crypto_async_request *base, int err)
555 struct sk_buff *skb = base->data;
557 xfrm_input_resume(skb, esp_input_done2(skb, err));
560 static void esp_input_restore_header(struct sk_buff *skb)
562 esp_restore_header(skb, 0);
566 static void esp_input_set_header(struct sk_buff *skb, __be32 *seqhi)
568 struct xfrm_state *x = xfrm_input_state(skb);
569 struct ip_esp_hdr *esph = (struct ip_esp_hdr *)skb->data;
571 /* For ESN we move the header forward by 4 bytes to
572 * accomodate the high bits. We will move it back after
575 if ((x->props.flags & XFRM_STATE_ESN)) {
576 esph = (void *)skb_push(skb, 4);
578 esph->spi = esph->seq_no;
579 esph->seq_no = XFRM_SKB_CB(skb)->seq.input.hi;
583 static void esp_input_done_esn(struct crypto_async_request *base, int err)
585 struct sk_buff *skb = base->data;
587 esp_input_restore_header(skb);
588 esp_input_done(base, err);
592 * Note: detecting truncated vs. non-truncated authentication data is very
593 * expensive, so we only support truncated data, which is the recommended
596 static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
598 struct ip_esp_hdr *esph;
599 struct crypto_aead *aead = x->data;
600 struct aead_request *req;
601 struct sk_buff *trailer;
602 int ivlen = crypto_aead_ivsize(aead);
603 int elen = skb->len - sizeof(*esph) - ivlen;
610 struct scatterlist *sg;
613 if (!pskb_may_pull(skb, sizeof(*esph) + ivlen))
619 assoclen = sizeof(*esph);
622 if (x->props.flags & XFRM_STATE_ESN) {
623 seqhilen += sizeof(__be32);
624 assoclen += seqhilen;
627 if (!skb_cloned(skb)) {
628 if (!skb_is_nonlinear(skb)) {
632 } else if (!skb_has_frag_list(skb)) {
633 nfrags = skb_shinfo(skb)->nr_frags;
640 err = skb_cow_data(skb, 0, &trailer);
648 tmp = esp_alloc_tmp(aead, nfrags, seqhilen);
652 ESP_SKB_CB(skb)->tmp = tmp;
653 seqhi = esp_tmp_extra(tmp);
654 iv = esp_tmp_iv(aead, tmp, seqhilen);
655 req = esp_tmp_req(aead, iv);
656 sg = esp_req_sg(aead, req);
658 esp_input_set_header(skb, seqhi);
660 sg_init_table(sg, nfrags);
661 skb_to_sgvec(skb, sg, 0, skb->len);
663 skb->ip_summed = CHECKSUM_NONE;
665 if ((x->props.flags & XFRM_STATE_ESN))
666 aead_request_set_callback(req, 0, esp_input_done_esn, skb);
668 aead_request_set_callback(req, 0, esp_input_done, skb);
670 aead_request_set_crypt(req, sg, sg, elen + ivlen, iv);
671 aead_request_set_ad(req, assoclen);
673 err = crypto_aead_decrypt(req);
674 if (err == -EINPROGRESS)
677 if ((x->props.flags & XFRM_STATE_ESN))
678 esp_input_restore_header(skb);
680 err = esp_input_done2(skb, err);
686 static u32 esp4_get_mtu(struct xfrm_state *x, int mtu)
688 struct crypto_aead *aead = x->data;
689 u32 blksize = ALIGN(crypto_aead_blocksize(aead), 4);
690 unsigned int net_adj;
692 switch (x->props.mode) {
693 case XFRM_MODE_TRANSPORT:
695 net_adj = sizeof(struct iphdr);
697 case XFRM_MODE_TUNNEL:
704 return ((mtu - x->props.header_len - crypto_aead_authsize(aead) -
705 net_adj) & ~(blksize - 1)) + net_adj - 2;
708 static int esp4_err(struct sk_buff *skb, u32 info)
710 struct net *net = dev_net(skb->dev);
711 const struct iphdr *iph = (const struct iphdr *)skb->data;
712 struct ip_esp_hdr *esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2));
713 struct xfrm_state *x;
715 switch (icmp_hdr(skb)->type) {
716 case ICMP_DEST_UNREACH:
717 if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
725 x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
726 esph->spi, IPPROTO_ESP, AF_INET);
730 if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
731 ipv4_update_pmtu(skb, net, info, 0, 0, IPPROTO_ESP, 0);
733 ipv4_redirect(skb, net, 0, 0, IPPROTO_ESP, 0);
739 static void esp_destroy(struct xfrm_state *x)
741 struct crypto_aead *aead = x->data;
746 crypto_free_aead(aead);
749 static int esp_init_aead(struct xfrm_state *x)
751 char aead_name[CRYPTO_MAX_ALG_NAME];
752 struct crypto_aead *aead;
756 if (snprintf(aead_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
757 x->geniv, x->aead->alg_name) >= CRYPTO_MAX_ALG_NAME)
760 aead = crypto_alloc_aead(aead_name, 0, 0);
767 err = crypto_aead_setkey(aead, x->aead->alg_key,
768 (x->aead->alg_key_len + 7) / 8);
772 err = crypto_aead_setauthsize(aead, x->aead->alg_icv_len / 8);
780 static int esp_init_authenc(struct xfrm_state *x)
782 struct crypto_aead *aead;
783 struct crypto_authenc_key_param *param;
787 char authenc_name[CRYPTO_MAX_ALG_NAME];
797 if ((x->props.flags & XFRM_STATE_ESN)) {
798 if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
799 "%s%sauthencesn(%s,%s)%s",
800 x->geniv ?: "", x->geniv ? "(" : "",
801 x->aalg ? x->aalg->alg_name : "digest_null",
803 x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME)
806 if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
807 "%s%sauthenc(%s,%s)%s",
808 x->geniv ?: "", x->geniv ? "(" : "",
809 x->aalg ? x->aalg->alg_name : "digest_null",
811 x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME)
815 aead = crypto_alloc_aead(authenc_name, 0, 0);
822 keylen = (x->aalg ? (x->aalg->alg_key_len + 7) / 8 : 0) +
823 (x->ealg->alg_key_len + 7) / 8 + RTA_SPACE(sizeof(*param));
825 key = kmalloc(keylen, GFP_KERNEL);
831 rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM;
832 rta->rta_len = RTA_LENGTH(sizeof(*param));
833 param = RTA_DATA(rta);
834 p += RTA_SPACE(sizeof(*param));
837 struct xfrm_algo_desc *aalg_desc;
839 memcpy(p, x->aalg->alg_key, (x->aalg->alg_key_len + 7) / 8);
840 p += (x->aalg->alg_key_len + 7) / 8;
842 aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
846 if (aalg_desc->uinfo.auth.icv_fullbits / 8 !=
847 crypto_aead_authsize(aead)) {
848 pr_info("ESP: %s digestsize %u != %hu\n",
850 crypto_aead_authsize(aead),
851 aalg_desc->uinfo.auth.icv_fullbits / 8);
855 err = crypto_aead_setauthsize(
856 aead, x->aalg->alg_trunc_len / 8);
861 param->enckeylen = cpu_to_be32((x->ealg->alg_key_len + 7) / 8);
862 memcpy(p, x->ealg->alg_key, (x->ealg->alg_key_len + 7) / 8);
864 err = crypto_aead_setkey(aead, key, keylen);
873 static int esp_init_state(struct xfrm_state *x)
875 struct crypto_aead *aead;
882 err = esp_init_aead(x);
884 err = esp_init_authenc(x);
891 x->props.header_len = sizeof(struct ip_esp_hdr) +
892 crypto_aead_ivsize(aead);
893 if (x->props.mode == XFRM_MODE_TUNNEL)
894 x->props.header_len += sizeof(struct iphdr);
895 else if (x->props.mode == XFRM_MODE_BEET && x->sel.family != AF_INET6)
896 x->props.header_len += IPV4_BEET_PHMAXLEN;
898 struct xfrm_encap_tmpl *encap = x->encap;
900 switch (encap->encap_type) {
903 case UDP_ENCAP_ESPINUDP:
904 x->props.header_len += sizeof(struct udphdr);
906 case UDP_ENCAP_ESPINUDP_NON_IKE:
907 x->props.header_len += sizeof(struct udphdr) + 2 * sizeof(u32);
912 align = ALIGN(crypto_aead_blocksize(aead), 4);
913 x->props.trailer_len = align + 1 + crypto_aead_authsize(aead);
919 static int esp4_rcv_cb(struct sk_buff *skb, int err)
924 static const struct xfrm_type esp_type =
926 .description = "ESP4",
927 .owner = THIS_MODULE,
928 .proto = IPPROTO_ESP,
929 .flags = XFRM_TYPE_REPLAY_PROT,
930 .init_state = esp_init_state,
931 .destructor = esp_destroy,
932 .get_mtu = esp4_get_mtu,
937 static struct xfrm4_protocol esp4_protocol = {
938 .handler = xfrm4_rcv,
939 .input_handler = xfrm_input,
940 .cb_handler = esp4_rcv_cb,
941 .err_handler = esp4_err,
945 static int __init esp4_init(void)
947 if (xfrm_register_type(&esp_type, AF_INET) < 0) {
948 pr_info("%s: can't add xfrm type\n", __func__);
951 if (xfrm4_protocol_register(&esp4_protocol, IPPROTO_ESP) < 0) {
952 pr_info("%s: can't add protocol\n", __func__);
953 xfrm_unregister_type(&esp_type, AF_INET);
959 static void __exit esp4_fini(void)
961 if (xfrm4_protocol_deregister(&esp4_protocol, IPPROTO_ESP) < 0)
962 pr_info("%s: can't remove protocol\n", __func__);
963 if (xfrm_unregister_type(&esp_type, AF_INET) < 0)
964 pr_info("%s: can't remove xfrm type\n", __func__);
967 module_init(esp4_init);
968 module_exit(esp4_fini);
969 MODULE_LICENSE("GPL");
970 MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_ESP);