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 xfrm_state *x,
156 struct ip_esp_hdr *esph,
157 struct esp_output_extra *extra)
159 /* For ESN we move the header forward by 4 bytes to
160 * accomodate the high bits. We will move it back after
163 if ((x->props.flags & XFRM_STATE_ESN)) {
165 struct xfrm_offload *xo = xfrm_offload(skb);
170 seqhi = XFRM_SKB_CB(skb)->seq.output.hi;
172 extra->esphoff = (unsigned char *)esph -
173 skb_transport_header(skb);
174 esph = (struct ip_esp_hdr *)((unsigned char *)esph - 4);
175 extra->seqhi = esph->spi;
176 esph->seq_no = htonl(seqhi);
179 esph->spi = x->id.spi;
184 static void esp_output_done_esn(struct crypto_async_request *base, int err)
186 struct sk_buff *skb = base->data;
188 esp_output_restore_header(skb);
189 esp_output_done(base, err);
192 static void esp_output_fill_trailer(u8 *tail, int tfclen, int plen, __u8 proto)
194 /* Fill padding... */
196 memset(tail, 0, tfclen);
201 for (i = 0; i < plen - 2; i++)
204 tail[plen - 2] = plen - 2;
205 tail[plen - 1] = proto;
208 static void esp_output_udp_encap(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp)
214 struct xfrm_encap_tmpl *encap = x->encap;
215 struct ip_esp_hdr *esph = esp->esph;
217 spin_lock_bh(&x->lock);
218 sport = encap->encap_sport;
219 dport = encap->encap_dport;
220 encap_type = encap->encap_type;
221 spin_unlock_bh(&x->lock);
223 uh = (struct udphdr *)esph;
226 uh->len = htons(skb->len + esp->tailen
227 - skb_transport_offset(skb));
230 switch (encap_type) {
232 case UDP_ENCAP_ESPINUDP:
233 esph = (struct ip_esp_hdr *)(uh + 1);
235 case UDP_ENCAP_ESPINUDP_NON_IKE:
236 udpdata32 = (__be32 *)(uh + 1);
237 udpdata32[0] = udpdata32[1] = 0;
238 esph = (struct ip_esp_hdr *)(udpdata32 + 2);
242 *skb_mac_header(skb) = IPPROTO_UDP;
246 int esp_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp)
252 struct sk_buff *trailer;
253 int tailen = esp->tailen;
255 /* this is non-NULL only with UDP Encapsulation */
257 esp_output_udp_encap(x, skb, esp);
259 if (!skb_cloned(skb)) {
260 if (tailen <= skb_availroom(skb)) {
263 tail = skb_tail_pointer(trailer);
266 } else if ((skb_shinfo(skb)->nr_frags < MAX_SKB_FRAGS)
267 && !skb_has_frag_list(skb)) {
269 struct sock *sk = skb->sk;
270 struct page_frag *pfrag = &x->xfrag;
272 esp->inplace = false;
274 allocsize = ALIGN(tailen, L1_CACHE_BYTES);
276 spin_lock_bh(&x->lock);
278 if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) {
279 spin_unlock_bh(&x->lock);
286 vaddr = kmap_atomic(page);
288 tail = vaddr + pfrag->offset;
290 esp_output_fill_trailer(tail, esp->tfclen, esp->plen, esp->proto);
292 kunmap_atomic(vaddr);
294 spin_unlock_bh(&x->lock);
296 nfrags = skb_shinfo(skb)->nr_frags;
298 __skb_fill_page_desc(skb, nfrags, page, pfrag->offset,
300 skb_shinfo(skb)->nr_frags = ++nfrags;
302 pfrag->offset = pfrag->offset + allocsize;
306 skb->data_len += tailen;
307 skb->truesize += tailen;
309 atomic_add(tailen, &sk->sk_wmem_alloc);
316 nfrags = skb_cow_data(skb, tailen, &trailer);
319 tail = skb_tail_pointer(trailer);
320 esp->esph = ip_esp_hdr(skb);
323 esp_output_fill_trailer(tail, esp->tfclen, esp->plen, esp->proto);
324 pskb_put(skb, trailer, tailen);
329 EXPORT_SYMBOL_GPL(esp_output_head);
331 int esp_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp)
340 struct ip_esp_hdr *esph;
341 struct crypto_aead *aead;
342 struct aead_request *req;
343 struct scatterlist *sg, *dsg;
344 struct esp_output_extra *extra;
347 assoclen = sizeof(struct ip_esp_hdr);
350 if (x->props.flags & XFRM_STATE_ESN) {
351 extralen += sizeof(*extra);
352 assoclen += sizeof(__be32);
356 alen = crypto_aead_authsize(aead);
357 ivlen = crypto_aead_ivsize(aead);
359 tmp = esp_alloc_tmp(aead, esp->nfrags + 2, extralen);
363 extra = esp_tmp_extra(tmp);
364 iv = esp_tmp_iv(aead, tmp, extralen);
365 req = esp_tmp_req(aead, iv);
366 sg = esp_req_sg(aead, req);
371 dsg = &sg[esp->nfrags];
373 esph = esp_output_set_extra(skb, x, esp->esph, extra);
376 sg_init_table(sg, esp->nfrags);
377 skb_to_sgvec(skb, sg,
378 (unsigned char *)esph - skb->data,
379 assoclen + ivlen + esp->clen + alen);
383 struct page_frag *pfrag = &x->xfrag;
385 allocsize = ALIGN(skb->data_len, L1_CACHE_BYTES);
387 spin_lock_bh(&x->lock);
388 if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) {
389 spin_unlock_bh(&x->lock);
393 skb_shinfo(skb)->nr_frags = 1;
397 /* replace page frags in skb with new page */
398 __skb_fill_page_desc(skb, 0, page, pfrag->offset, skb->data_len);
399 pfrag->offset = pfrag->offset + allocsize;
400 spin_unlock_bh(&x->lock);
402 sg_init_table(dsg, skb_shinfo(skb)->nr_frags + 1);
403 skb_to_sgvec(skb, dsg,
404 (unsigned char *)esph - skb->data,
405 assoclen + ivlen + esp->clen + alen);
408 if ((x->props.flags & XFRM_STATE_ESN))
409 aead_request_set_callback(req, 0, esp_output_done_esn, skb);
411 aead_request_set_callback(req, 0, esp_output_done, skb);
413 aead_request_set_crypt(req, sg, dsg, ivlen + esp->clen, iv);
414 aead_request_set_ad(req, assoclen);
416 memset(iv, 0, ivlen);
417 memcpy(iv + ivlen - min(ivlen, 8), (u8 *)&esp->seqno + 8 - min(ivlen, 8),
420 ESP_SKB_CB(skb)->tmp = tmp;
421 err = crypto_aead_encrypt(req);
432 if ((x->props.flags & XFRM_STATE_ESN))
433 esp_output_restore_header(skb);
437 esp_ssg_unref(x, tmp);
443 EXPORT_SYMBOL_GPL(esp_output_tail);
445 static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
449 struct ip_esp_hdr *esph;
450 struct crypto_aead *aead;
455 esp.proto = *skb_mac_header(skb);
456 *skb_mac_header(skb) = IPPROTO_ESP;
458 /* skb is pure payload to encrypt */
461 alen = crypto_aead_authsize(aead);
465 struct xfrm_dst *dst = (struct xfrm_dst *)skb_dst(skb);
468 padto = min(x->tfcpad, esp4_get_mtu(x, dst->child_mtu_cached));
469 if (skb->len < padto)
470 esp.tfclen = padto - skb->len;
472 blksize = ALIGN(crypto_aead_blocksize(aead), 4);
473 esp.clen = ALIGN(skb->len + 2 + esp.tfclen, blksize);
474 esp.plen = esp.clen - skb->len - esp.tfclen;
475 esp.tailen = esp.tfclen + esp.plen + alen;
477 esp.esph = ip_esp_hdr(skb);
479 esp.nfrags = esp_output_head(x, skb, &esp);
484 esph->spi = x->id.spi;
486 esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
487 esp.seqno = cpu_to_be64(XFRM_SKB_CB(skb)->seq.output.low +
488 ((u64)XFRM_SKB_CB(skb)->seq.output.hi << 32));
490 skb_push(skb, -skb_network_offset(skb));
492 return esp_output_tail(x, skb, &esp);
495 int esp_input_done2(struct sk_buff *skb, int err)
497 const struct iphdr *iph;
498 struct xfrm_state *x = xfrm_input_state(skb);
499 struct xfrm_offload *xo = xfrm_offload(skb);
500 struct crypto_aead *aead = x->data;
501 int alen = crypto_aead_authsize(aead);
502 int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead);
503 int elen = skb->len - hlen;
508 if (!xo || (xo && !(xo->flags & CRYPTO_DONE)))
509 kfree(ESP_SKB_CB(skb)->tmp);
514 if (skb_copy_bits(skb, skb->len-alen-2, nexthdr, 2))
519 if (padlen + 2 + alen >= elen)
522 /* ... check padding bits here. Silly. :-) */
528 struct xfrm_encap_tmpl *encap = x->encap;
529 struct udphdr *uh = (void *)(skb_network_header(skb) + ihl);
532 * 1) if the NAT-T peer's IP or port changed then
533 * advertize the change to the keying daemon.
534 * This is an inbound SA, so just compare
537 if (iph->saddr != x->props.saddr.a4 ||
538 uh->source != encap->encap_sport) {
539 xfrm_address_t ipaddr;
541 ipaddr.a4 = iph->saddr;
542 km_new_mapping(x, &ipaddr, uh->source);
544 /* XXX: perhaps add an extra
545 * policy check here, to see
546 * if we should allow or
547 * reject a packet from a
554 * 2) ignore UDP/TCP checksums in case
555 * of NAT-T in Transport Mode, or
556 * perform other post-processing fixes
557 * as per draft-ietf-ipsec-udp-encaps-06,
560 if (x->props.mode == XFRM_MODE_TRANSPORT)
561 skb->ip_summed = CHECKSUM_UNNECESSARY;
564 pskb_trim(skb, skb->len - alen - padlen - 2);
565 __skb_pull(skb, hlen);
566 if (x->props.mode == XFRM_MODE_TUNNEL)
567 skb_reset_transport_header(skb);
569 skb_set_transport_header(skb, -ihl);
573 /* RFC4303: Drop dummy packets without any error */
574 if (err == IPPROTO_NONE)
580 EXPORT_SYMBOL_GPL(esp_input_done2);
582 static void esp_input_done(struct crypto_async_request *base, int err)
584 struct sk_buff *skb = base->data;
586 xfrm_input_resume(skb, esp_input_done2(skb, err));
589 static void esp_input_restore_header(struct sk_buff *skb)
591 esp_restore_header(skb, 0);
595 static void esp_input_set_header(struct sk_buff *skb, __be32 *seqhi)
597 struct xfrm_state *x = xfrm_input_state(skb);
598 struct ip_esp_hdr *esph = (struct ip_esp_hdr *)skb->data;
600 /* For ESN we move the header forward by 4 bytes to
601 * accomodate the high bits. We will move it back after
604 if ((x->props.flags & XFRM_STATE_ESN)) {
605 esph = (void *)skb_push(skb, 4);
607 esph->spi = esph->seq_no;
608 esph->seq_no = XFRM_SKB_CB(skb)->seq.input.hi;
612 static void esp_input_done_esn(struct crypto_async_request *base, int err)
614 struct sk_buff *skb = base->data;
616 esp_input_restore_header(skb);
617 esp_input_done(base, err);
621 * Note: detecting truncated vs. non-truncated authentication data is very
622 * expensive, so we only support truncated data, which is the recommended
625 static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
627 struct ip_esp_hdr *esph;
628 struct crypto_aead *aead = x->data;
629 struct aead_request *req;
630 struct sk_buff *trailer;
631 int ivlen = crypto_aead_ivsize(aead);
632 int elen = skb->len - sizeof(*esph) - ivlen;
639 struct scatterlist *sg;
642 if (!pskb_may_pull(skb, sizeof(*esph) + ivlen))
648 assoclen = sizeof(*esph);
651 if (x->props.flags & XFRM_STATE_ESN) {
652 seqhilen += sizeof(__be32);
653 assoclen += seqhilen;
656 if (!skb_cloned(skb)) {
657 if (!skb_is_nonlinear(skb)) {
661 } else if (!skb_has_frag_list(skb)) {
662 nfrags = skb_shinfo(skb)->nr_frags;
669 err = skb_cow_data(skb, 0, &trailer);
677 tmp = esp_alloc_tmp(aead, nfrags, seqhilen);
681 ESP_SKB_CB(skb)->tmp = tmp;
682 seqhi = esp_tmp_extra(tmp);
683 iv = esp_tmp_iv(aead, tmp, seqhilen);
684 req = esp_tmp_req(aead, iv);
685 sg = esp_req_sg(aead, req);
687 esp_input_set_header(skb, seqhi);
689 sg_init_table(sg, nfrags);
690 skb_to_sgvec(skb, sg, 0, skb->len);
692 skb->ip_summed = CHECKSUM_NONE;
694 if ((x->props.flags & XFRM_STATE_ESN))
695 aead_request_set_callback(req, 0, esp_input_done_esn, skb);
697 aead_request_set_callback(req, 0, esp_input_done, skb);
699 aead_request_set_crypt(req, sg, sg, elen + ivlen, iv);
700 aead_request_set_ad(req, assoclen);
702 err = crypto_aead_decrypt(req);
703 if (err == -EINPROGRESS)
706 if ((x->props.flags & XFRM_STATE_ESN))
707 esp_input_restore_header(skb);
709 err = esp_input_done2(skb, err);
715 static u32 esp4_get_mtu(struct xfrm_state *x, int mtu)
717 struct crypto_aead *aead = x->data;
718 u32 blksize = ALIGN(crypto_aead_blocksize(aead), 4);
719 unsigned int net_adj;
721 switch (x->props.mode) {
722 case XFRM_MODE_TRANSPORT:
724 net_adj = sizeof(struct iphdr);
726 case XFRM_MODE_TUNNEL:
733 return ((mtu - x->props.header_len - crypto_aead_authsize(aead) -
734 net_adj) & ~(blksize - 1)) + net_adj - 2;
737 static int esp4_err(struct sk_buff *skb, u32 info)
739 struct net *net = dev_net(skb->dev);
740 const struct iphdr *iph = (const struct iphdr *)skb->data;
741 struct ip_esp_hdr *esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2));
742 struct xfrm_state *x;
744 switch (icmp_hdr(skb)->type) {
745 case ICMP_DEST_UNREACH:
746 if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
754 x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
755 esph->spi, IPPROTO_ESP, AF_INET);
759 if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
760 ipv4_update_pmtu(skb, net, info, 0, 0, IPPROTO_ESP, 0);
762 ipv4_redirect(skb, net, 0, 0, IPPROTO_ESP, 0);
768 static void esp_destroy(struct xfrm_state *x)
770 struct crypto_aead *aead = x->data;
775 crypto_free_aead(aead);
778 static int esp_init_aead(struct xfrm_state *x)
780 char aead_name[CRYPTO_MAX_ALG_NAME];
781 struct crypto_aead *aead;
786 if (snprintf(aead_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
787 x->geniv, x->aead->alg_name) >= CRYPTO_MAX_ALG_NAME)
790 if (x->xso.offload_handle)
791 mask |= CRYPTO_ALG_ASYNC;
793 aead = crypto_alloc_aead(aead_name, 0, mask);
800 err = crypto_aead_setkey(aead, x->aead->alg_key,
801 (x->aead->alg_key_len + 7) / 8);
805 err = crypto_aead_setauthsize(aead, x->aead->alg_icv_len / 8);
813 static int esp_init_authenc(struct xfrm_state *x)
815 struct crypto_aead *aead;
816 struct crypto_authenc_key_param *param;
820 char authenc_name[CRYPTO_MAX_ALG_NAME];
831 if ((x->props.flags & XFRM_STATE_ESN)) {
832 if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
833 "%s%sauthencesn(%s,%s)%s",
834 x->geniv ?: "", x->geniv ? "(" : "",
835 x->aalg ? x->aalg->alg_name : "digest_null",
837 x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME)
840 if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
841 "%s%sauthenc(%s,%s)%s",
842 x->geniv ?: "", x->geniv ? "(" : "",
843 x->aalg ? x->aalg->alg_name : "digest_null",
845 x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME)
849 if (x->xso.offload_handle)
850 mask |= CRYPTO_ALG_ASYNC;
852 aead = crypto_alloc_aead(authenc_name, 0, mask);
859 keylen = (x->aalg ? (x->aalg->alg_key_len + 7) / 8 : 0) +
860 (x->ealg->alg_key_len + 7) / 8 + RTA_SPACE(sizeof(*param));
862 key = kmalloc(keylen, GFP_KERNEL);
868 rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM;
869 rta->rta_len = RTA_LENGTH(sizeof(*param));
870 param = RTA_DATA(rta);
871 p += RTA_SPACE(sizeof(*param));
874 struct xfrm_algo_desc *aalg_desc;
876 memcpy(p, x->aalg->alg_key, (x->aalg->alg_key_len + 7) / 8);
877 p += (x->aalg->alg_key_len + 7) / 8;
879 aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
883 if (aalg_desc->uinfo.auth.icv_fullbits / 8 !=
884 crypto_aead_authsize(aead)) {
885 pr_info("ESP: %s digestsize %u != %hu\n",
887 crypto_aead_authsize(aead),
888 aalg_desc->uinfo.auth.icv_fullbits / 8);
892 err = crypto_aead_setauthsize(
893 aead, x->aalg->alg_trunc_len / 8);
898 param->enckeylen = cpu_to_be32((x->ealg->alg_key_len + 7) / 8);
899 memcpy(p, x->ealg->alg_key, (x->ealg->alg_key_len + 7) / 8);
901 err = crypto_aead_setkey(aead, key, keylen);
910 static int esp_init_state(struct xfrm_state *x)
912 struct crypto_aead *aead;
919 err = esp_init_aead(x);
921 err = esp_init_authenc(x);
928 x->props.header_len = sizeof(struct ip_esp_hdr) +
929 crypto_aead_ivsize(aead);
930 if (x->props.mode == XFRM_MODE_TUNNEL)
931 x->props.header_len += sizeof(struct iphdr);
932 else if (x->props.mode == XFRM_MODE_BEET && x->sel.family != AF_INET6)
933 x->props.header_len += IPV4_BEET_PHMAXLEN;
935 struct xfrm_encap_tmpl *encap = x->encap;
937 switch (encap->encap_type) {
940 case UDP_ENCAP_ESPINUDP:
941 x->props.header_len += sizeof(struct udphdr);
943 case UDP_ENCAP_ESPINUDP_NON_IKE:
944 x->props.header_len += sizeof(struct udphdr) + 2 * sizeof(u32);
949 align = ALIGN(crypto_aead_blocksize(aead), 4);
950 x->props.trailer_len = align + 1 + crypto_aead_authsize(aead);
956 static int esp4_rcv_cb(struct sk_buff *skb, int err)
961 static const struct xfrm_type esp_type =
963 .description = "ESP4",
964 .owner = THIS_MODULE,
965 .proto = IPPROTO_ESP,
966 .flags = XFRM_TYPE_REPLAY_PROT,
967 .init_state = esp_init_state,
968 .destructor = esp_destroy,
969 .get_mtu = esp4_get_mtu,
971 .output = esp_output,
974 static struct xfrm4_protocol esp4_protocol = {
975 .handler = xfrm4_rcv,
976 .input_handler = xfrm_input,
977 .cb_handler = esp4_rcv_cb,
978 .err_handler = esp4_err,
982 static int __init esp4_init(void)
984 if (xfrm_register_type(&esp_type, AF_INET) < 0) {
985 pr_info("%s: can't add xfrm type\n", __func__);
988 if (xfrm4_protocol_register(&esp4_protocol, IPPROTO_ESP) < 0) {
989 pr_info("%s: can't add protocol\n", __func__);
990 xfrm_unregister_type(&esp_type, AF_INET);
996 static void __exit esp4_fini(void)
998 if (xfrm4_protocol_deregister(&esp4_protocol, IPPROTO_ESP) < 0)
999 pr_info("%s: can't remove protocol\n", __func__);
1000 if (xfrm_unregister_type(&esp_type, AF_INET) < 0)
1001 pr_info("%s: can't remove xfrm type\n", __func__);
1004 module_init(esp4_init);
1005 module_exit(esp4_fini);
1006 MODULE_LICENSE("GPL");
1007 MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_ESP);