[deliverable/linux.git] / net / ipv6 / esp6.c

/*
 * Copyright (C)2002 USAGI/WIDE Project
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 *
 * Authors
 *
 *	Mitsuru KANDA @USAGI       : IPv6 Support
 *	Kazunori MIYAZAWA @USAGI   :
 *	Kunihiro Ishiguro <kunihiro@ipinfusion.com>
 *
 *	This file is derived from net/ipv4/esp.c
 */

#define pr_fmt(fmt) "IPv6: " fmt

#include <crypto/aead.h>
#include <crypto/authenc.h>
#include <linux/err.h>
#include <linux/module.h>
#include <net/ip.h>
#include <net/xfrm.h>
#include <net/esp.h>
#include <linux/scatterlist.h>
#include <linux/kernel.h>
#include <linux/pfkeyv2.h>
#include <linux/random.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <net/ip6_route.h>
#include <net/icmp.h>
#include <net/ipv6.h>
#include <net/protocol.h>
#include <linux/icmpv6.h>

struct esp_skb_cb {
	struct xfrm_skb_cb xfrm;
	void *tmp;
};

#define ESP_SKB_CB(__skb) ((struct esp_skb_cb *)&((__skb)->cb[0]))

static u32 esp6_get_mtu(struct xfrm_state *x, int mtu);

/*
 * Allocate an AEAD request structure with extra space for SG and IV.
 *
 * For alignment considerations the upper 32 bits of the sequence number are
 * placed at the front, if present. Followed by the IV, the request and finally
 * the SG list.
 *
 * TODO: Use spare space in skb for this where possible.
 */
static void *esp_alloc_tmp(struct crypto_aead *aead, int nfrags, int seqihlen)
{
	unsigned int len;

	len = seqihlen;

	len += crypto_aead_ivsize(aead);

	if (len) {
		len += crypto_aead_alignmask(aead) &
		       ~(crypto_tfm_ctx_alignment() - 1);
		len = ALIGN(len, crypto_tfm_ctx_alignment());
	}

	len += sizeof(struct aead_givcrypt_request) + crypto_aead_reqsize(aead);
	len = ALIGN(len, __alignof__(struct scatterlist));

	len += sizeof(struct scatterlist) * nfrags;

	return kmalloc(len, GFP_ATOMIC);
}

static inline __be32 *esp_tmp_seqhi(void *tmp)
{
	return PTR_ALIGN((__be32 *)tmp, __alignof__(__be32));
}

static inline u8 *esp_tmp_iv(struct crypto_aead *aead, void *tmp, int seqhilen)
{
	return crypto_aead_ivsize(aead) ?
	       PTR_ALIGN((u8 *)tmp + seqhilen,
			 crypto_aead_alignmask(aead) + 1) : tmp + seqhilen;
}

static inline struct aead_givcrypt_request *esp_tmp_givreq(
	struct crypto_aead *aead, u8 *iv)
{
	struct aead_givcrypt_request *req;

	req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead),
				crypto_tfm_ctx_alignment());
	aead_givcrypt_set_tfm(req, aead);
	return req;
}

static inline struct aead_request *esp_tmp_req(struct crypto_aead *aead, u8 *iv)
{
	struct aead_request *req;

	req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead),
				crypto_tfm_ctx_alignment());
	aead_request_set_tfm(req, aead);
	return req;
}

static inline struct scatterlist *esp_req_sg(struct crypto_aead *aead,
					     struct aead_request *req)
{
	return (void *)ALIGN((unsigned long)(req + 1) +
			     crypto_aead_reqsize(aead),
			     __alignof__(struct scatterlist));
}

static inline struct scatterlist *esp_givreq_sg(
	struct crypto_aead *aead, struct aead_givcrypt_request *req)
{
	return (void *)ALIGN((unsigned long)(req + 1) +
			     crypto_aead_reqsize(aead),
			     __alignof__(struct scatterlist));
}

static void esp_output_done(struct crypto_async_request *base, int err)
{
	struct sk_buff *skb = base->data;

	kfree(ESP_SKB_CB(skb)->tmp);
	xfrm_output_resume(skb, err);
}

static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
{
	int err;
	struct ip_esp_hdr *esph;
	struct crypto_aead *aead;
	struct aead_givcrypt_request *req;
	struct scatterlist *sg;
	struct scatterlist *asg;
	struct sk_buff *trailer;
	void *tmp;
	int blksize;
	int clen;
	int alen;
	int plen;
	int tfclen;
	int nfrags;
	int assoclen;
	int sglists;
	int seqhilen;
	u8 *iv;
	u8 *tail;
	__be32 *seqhi;

	/* skb is pure payload to encrypt */
	aead = x->data;
	alen = crypto_aead_authsize(aead);

	tfclen = 0;
	if (x->tfcpad) {
		struct xfrm_dst *dst = (struct xfrm_dst *)skb_dst(skb);
		u32 padto;

		padto = min(x->tfcpad, esp6_get_mtu(x, dst->child_mtu_cached));
		if (skb->len < padto)
			tfclen = padto - skb->len;
	}
	blksize = ALIGN(crypto_aead_blocksize(aead), 4);
	clen = ALIGN(skb->len + 2 + tfclen, blksize);
	plen = clen - skb->len - tfclen;

	err = skb_cow_data(skb, tfclen + plen + alen, &trailer);
	if (err < 0)
		goto error;
	nfrags = err;

	assoclen = sizeof(*esph);
	sglists = 1;
	seqhilen = 0;

	if (x->props.flags & XFRM_STATE_ESN) {
		sglists += 2;
		seqhilen += sizeof(__be32);
		assoclen += seqhilen;
	}

	tmp = esp_alloc_tmp(aead, nfrags + sglists, seqhilen);
	if (!tmp) {
		err = -ENOMEM;
		goto error;
	}

	seqhi = esp_tmp_seqhi(tmp);
	iv = esp_tmp_iv(aead, tmp, seqhilen);
	req = esp_tmp_givreq(aead, iv);
	asg = esp_givreq_sg(aead, req);
	sg = asg + sglists;

	/* Fill padding... */
	tail = skb_tail_pointer(trailer);
	if (tfclen) {
		memset(tail, 0, tfclen);
		tail += tfclen;
	}
	do {
		int i;
		for (i = 0; i < plen - 2; i++)
			tail[i] = i + 1;
	} while (0);
	tail[plen - 2] = plen - 2;
	tail[plen - 1] = *skb_mac_header(skb);
	pskb_put(skb, trailer, clen - skb->len + alen);

	skb_push(skb, -skb_network_offset(skb));
	esph = ip_esp_hdr(skb);
	*skb_mac_header(skb) = IPPROTO_ESP;

	esph->spi = x->id.spi;
	esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);

	sg_init_table(sg, nfrags);
	skb_to_sgvec(skb, sg,
		     esph->enc_data + crypto_aead_ivsize(aead) - skb->data,
		     clen + alen);

	if ((x->props.flags & XFRM_STATE_ESN)) {
		sg_init_table(asg, 3);
		sg_set_buf(asg, &esph->spi, sizeof(__be32));
		*seqhi = htonl(XFRM_SKB_CB(skb)->seq.output.hi);
		sg_set_buf(asg + 1, seqhi, seqhilen);
		sg_set_buf(asg + 2, &esph->seq_no, sizeof(__be32));
	} else
		sg_init_one(asg, esph, sizeof(*esph));

	aead_givcrypt_set_callback(req, 0, esp_output_done, skb);
	aead_givcrypt_set_crypt(req, sg, sg, clen, iv);
	aead_givcrypt_set_assoc(req, asg, assoclen);
	aead_givcrypt_set_giv(req, esph->enc_data,
			      XFRM_SKB_CB(skb)->seq.output.low);

	ESP_SKB_CB(skb)->tmp = tmp;
	err = crypto_aead_givencrypt(req);
	if (err == -EINPROGRESS)
		goto error;

	if (err == -EBUSY)
		err = NET_XMIT_DROP;

	kfree(tmp);

error:
	return err;
}

static int esp_input_done2(struct sk_buff *skb, int err)
{
	struct xfrm_state *x = xfrm_input_state(skb);
	struct crypto_aead *aead = x->data;
	int alen = crypto_aead_authsize(aead);
	int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead);
	int elen = skb->len - hlen;
	int hdr_len = skb_network_header_len(skb);
	int padlen;
	u8 nexthdr[2];

	kfree(ESP_SKB_CB(skb)->tmp);

	if (unlikely(err))
		goto out;

	if (skb_copy_bits(skb, skb->len - alen - 2, nexthdr, 2))
		BUG();

	err = -EINVAL;
	padlen = nexthdr[0];
	if (padlen + 2 + alen >= elen) {
		net_dbg_ratelimited("ipsec esp packet is garbage padlen=%d, elen=%d\n",
				    padlen + 2, elen - alen);
		goto out;
	}

	/* ... check padding bits here. Silly. :-) */

	pskb_trim(skb, skb->len - alen - padlen - 2);
	__skb_pull(skb, hlen);
	if (x->props.mode == XFRM_MODE_TUNNEL)
		skb_reset_transport_header(skb);
	else
		skb_set_transport_header(skb, -hdr_len);

	err = nexthdr[1];

	/* RFC4303: Drop dummy packets without any error */
	if (err == IPPROTO_NONE)
		err = -EINVAL;

out:
	return err;
}

static void esp_input_done(struct crypto_async_request *base, int err)
{
	struct sk_buff *skb = base->data;

	xfrm_input_resume(skb, esp_input_done2(skb, err));
}

static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
{
	struct ip_esp_hdr *esph;
	struct crypto_aead *aead = x->data;
	struct aead_request *req;
	struct sk_buff *trailer;
	int elen = skb->len - sizeof(*esph) - crypto_aead_ivsize(aead);
	int nfrags;
	int assoclen;
	int sglists;
	int seqhilen;
	int ret = 0;
	void *tmp;
	__be32 *seqhi;
	u8 *iv;
	struct scatterlist *sg;
	struct scatterlist *asg;

	if (!pskb_may_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead))) {
		ret = -EINVAL;
		goto out;
	}

	if (elen <= 0) {
		ret = -EINVAL;
		goto out;
	}

	nfrags = skb_cow_data(skb, 0, &trailer);
	if (nfrags < 0) {
		ret = -EINVAL;
		goto out;
	}

	ret = -ENOMEM;

	assoclen = sizeof(*esph);
	sglists = 1;
	seqhilen = 0;

	if (x->props.flags & XFRM_STATE_ESN) {
		sglists += 2;
		seqhilen += sizeof(__be32);
		assoclen += seqhilen;
	}

	tmp = esp_alloc_tmp(aead, nfrags + sglists, seqhilen);
	if (!tmp)
		goto out;

	ESP_SKB_CB(skb)->tmp = tmp;
	seqhi = esp_tmp_seqhi(tmp);
	iv = esp_tmp_iv(aead, tmp, seqhilen);
	req = esp_tmp_req(aead, iv);
	asg = esp_req_sg(aead, req);
	sg = asg + sglists;

	skb->ip_summed = CHECKSUM_NONE;

	esph = (struct ip_esp_hdr *)skb->data;

	/* Get ivec. This can be wrong, check against another impls. */
	iv = esph->enc_data;

	sg_init_table(sg, nfrags);
	skb_to_sgvec(skb, sg, sizeof(*esph) + crypto_aead_ivsize(aead), elen);

	if ((x->props.flags & XFRM_STATE_ESN)) {
		sg_init_table(asg, 3);
		sg_set_buf(asg, &esph->spi, sizeof(__be32));
		*seqhi = XFRM_SKB_CB(skb)->seq.input.hi;
		sg_set_buf(asg + 1, seqhi, seqhilen);
		sg_set_buf(asg + 2, &esph->seq_no, sizeof(__be32));
	} else
		sg_init_one(asg, esph, sizeof(*esph));

	aead_request_set_callback(req, 0, esp_input_done, skb);
	aead_request_set_crypt(req, sg, sg, elen, iv);
	aead_request_set_assoc(req, asg, assoclen);

	ret = crypto_aead_decrypt(req);
	if (ret == -EINPROGRESS)
		goto out;

	ret = esp_input_done2(skb, ret);

out:
	return ret;
}

static u32 esp6_get_mtu(struct xfrm_state *x, int mtu)
{
	struct crypto_aead *aead = x->data;
	u32 blksize = ALIGN(crypto_aead_blocksize(aead), 4);
	unsigned int net_adj;

	if (x->props.mode != XFRM_MODE_TUNNEL)
		net_adj = sizeof(struct ipv6hdr);
	else
		net_adj = 0;

	return ((mtu - x->props.header_len - crypto_aead_authsize(aead) -
		 net_adj) & ~(blksize - 1)) + net_adj - 2;
}

static int esp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
		    u8 type, u8 code, int offset, __be32 info)
{
	struct net *net = dev_net(skb->dev);
	const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
	struct ip_esp_hdr *esph = (struct ip_esp_hdr *)(skb->data + offset);
	struct xfrm_state *x;

	if (type != ICMPV6_PKT_TOOBIG &&
	    type != NDISC_REDIRECT)
		return 0;

	x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
			      esph->spi, IPPROTO_ESP, AF_INET6);
	if (!x)
		return 0;

	if (type == NDISC_REDIRECT)
		ip6_redirect(skb, net, skb->dev->ifindex, 0);
	else
		ip6_update_pmtu(skb, net, info, 0, 0);
	xfrm_state_put(x);

	return 0;
}

static void esp6_destroy(struct xfrm_state *x)
{
	struct crypto_aead *aead = x->data;

	if (!aead)
		return;

	crypto_free_aead(aead);
}

static int esp_init_aead(struct xfrm_state *x)
{
	struct crypto_aead *aead;
	int err;

	aead = crypto_alloc_aead(x->aead->alg_name, 0, 0);
	err = PTR_ERR(aead);
	if (IS_ERR(aead))
		goto error;

	x->data = aead;

	err = crypto_aead_setkey(aead, x->aead->alg_key,
				 (x->aead->alg_key_len + 7) / 8);
	if (err)
		goto error;

	err = crypto_aead_setauthsize(aead, x->aead->alg_icv_len / 8);
	if (err)
		goto error;

error:
	return err;
}

static int esp_init_authenc(struct xfrm_state *x)
{
	struct crypto_aead *aead;
	struct crypto_authenc_key_param *param;
	struct rtattr *rta;
	char *key;
	char *p;
	char authenc_name[CRYPTO_MAX_ALG_NAME];
	unsigned int keylen;
	int err;

	err = -EINVAL;
	if (!x->ealg)
		goto error;

	err = -ENAMETOOLONG;

	if ((x->props.flags & XFRM_STATE_ESN)) {
		if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
			     "authencesn(%s,%s)",
			     x->aalg ? x->aalg->alg_name : "digest_null",
			     x->ealg->alg_name) >= CRYPTO_MAX_ALG_NAME)
			goto error;
	} else {
		if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
			     "authenc(%s,%s)",
			     x->aalg ? x->aalg->alg_name : "digest_null",
			     x->ealg->alg_name) >= CRYPTO_MAX_ALG_NAME)
			goto error;
	}

	aead = crypto_alloc_aead(authenc_name, 0, 0);
	err = PTR_ERR(aead);
	if (IS_ERR(aead))
		goto error;

	x->data = aead;

	keylen = (x->aalg ? (x->aalg->alg_key_len + 7) / 8 : 0) +
		 (x->ealg->alg_key_len + 7) / 8 + RTA_SPACE(sizeof(*param));
	err = -ENOMEM;
	key = kmalloc(keylen, GFP_KERNEL);
	if (!key)
		goto error;

	p = key;
	rta = (void *)p;
	rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM;
	rta->rta_len = RTA_LENGTH(sizeof(*param));
	param = RTA_DATA(rta);
	p += RTA_SPACE(sizeof(*param));

	if (x->aalg) {
		struct xfrm_algo_desc *aalg_desc;

		memcpy(p, x->aalg->alg_key, (x->aalg->alg_key_len + 7) / 8);
		p += (x->aalg->alg_key_len + 7) / 8;

		aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
		BUG_ON(!aalg_desc);

		err = -EINVAL;
		if (aalg_desc->uinfo.auth.icv_fullbits / 8 !=
		    crypto_aead_authsize(aead)) {
			pr_info("ESP: %s digestsize %u != %hu\n",
				x->aalg->alg_name,
				crypto_aead_authsize(aead),
				aalg_desc->uinfo.auth.icv_fullbits / 8);
			goto free_key;
		}

		err = crypto_aead_setauthsize(
			aead, x->aalg->alg_trunc_len / 8);
		if (err)
			goto free_key;
	}

	param->enckeylen = cpu_to_be32((x->ealg->alg_key_len + 7) / 8);
	memcpy(p, x->ealg->alg_key, (x->ealg->alg_key_len + 7) / 8);

	err = crypto_aead_setkey(aead, key, keylen);

free_key:
	kfree(key);

error:
	return err;
}

static int esp6_init_state(struct xfrm_state *x)
{
	struct crypto_aead *aead;
	u32 align;
	int err;

	if (x->encap)
		return -EINVAL;

	x->data = NULL;

	if (x->aead)
		err = esp_init_aead(x);
	else
		err = esp_init_authenc(x);

	if (err)
		goto error;

	aead = x->data;

	x->props.header_len = sizeof(struct ip_esp_hdr) +
			      crypto_aead_ivsize(aead);
	switch (x->props.mode) {
	case XFRM_MODE_BEET:
		if (x->sel.family != AF_INET6)
			x->props.header_len += IPV4_BEET_PHMAXLEN +
					       (sizeof(struct ipv6hdr) - sizeof(struct iphdr));
		break;
	case XFRM_MODE_TRANSPORT:
		break;
	case XFRM_MODE_TUNNEL:
		x->props.header_len += sizeof(struct ipv6hdr);
		break;
	default:
		goto error;
	}

	align = ALIGN(crypto_aead_blocksize(aead), 4);
	x->props.trailer_len = align + 1 + crypto_aead_authsize(aead);

error:
	return err;
}

static int esp6_rcv_cb(struct sk_buff *skb, int err)
{
	return 0;
}

static const struct xfrm_type esp6_type = {
	.description	= "ESP6",
	.owner		= THIS_MODULE,
	.proto		= IPPROTO_ESP,
	.flags		= XFRM_TYPE_REPLAY_PROT,
	.init_state	= esp6_init_state,
	.destructor	= esp6_destroy,
	.get_mtu	= esp6_get_mtu,
	.input		= esp6_input,
	.output		= esp6_output,
	.hdr_offset	= xfrm6_find_1stfragopt,
};

static struct xfrm6_protocol esp6_protocol = {
	.handler	=	xfrm6_rcv,
	.cb_handler	=	esp6_rcv_cb,
	.err_handler	=	esp6_err,
	.priority	=	0,
};

static int __init esp6_init(void)
{
	if (xfrm_register_type(&esp6_type, AF_INET6) < 0) {
		pr_info("%s: can't add xfrm type\n", __func__);
		return -EAGAIN;
	}
	if (xfrm6_protocol_register(&esp6_protocol, IPPROTO_ESP) < 0) {
		pr_info("%s: can't add protocol\n", __func__);
		xfrm_unregister_type(&esp6_type, AF_INET6);
		return -EAGAIN;
	}

	return 0;
}

static void __exit esp6_fini(void)
{
	if (xfrm6_protocol_deregister(&esp6_protocol, IPPROTO_ESP) < 0)
		pr_info("%s: can't remove protocol\n", __func__);
	if (xfrm_unregister_type(&esp6_type, AF_INET6) < 0)
		pr_info("%s: can't remove xfrm type\n", __func__);
}

module_init(esp6_init);
module_exit(esp6_fini);

MODULE_LICENSE("GPL");
MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_ESP);
Commit	Line	Data
1da177e4 LT	1	/*
1da177e4 LT	2	* Copyright (C)2002 USAGI/WIDE Project
1ab1457c	3	*
1da177e4 LT	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.
1ab1457c	8	*
1da177e4 LT	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.
1ab1457c	13	*
1da177e4	14	* You should have received a copy of the GNU General Public License
a99421d9	15	* along with this program; if not, see <http://www.gnu.org/licenses/>.
1da177e4 LT	16	*
	17	* Authors
	18	*
1ab1457c	19	* Mitsuru KANDA @USAGI : IPv6 Support
67ba4152 IM	20	* Kazunori MIYAZAWA @USAGI :
67ba4152 IM	21	* Kunihiro Ishiguro <kunihiro@ipinfusion.com>
1ab1457c	22	*
67ba4152	23	* This file is derived from net/ipv4/esp.c
1da177e4 LT	24	*/
1da177e4 LT	25
f3213831 JP	26	#define pr_fmt(fmt) "IPv6: " fmt
f3213831 JP	27
38320c70 HX	28	#include <crypto/aead.h>
38320c70 HX	29	#include <crypto/authenc.h>
6b7326c8	30	#include <linux/err.h>
1da177e4 LT	31	#include <linux/module.h>
	32	#include <net/ip.h>
	33	#include <net/xfrm.h>
	34	#include <net/esp.h>
72998d8c	35	#include <linux/scatterlist.h>
a02a6422	36	#include <linux/kernel.h>
1da177e4 LT	37	#include <linux/pfkeyv2.h>
1da177e4 LT	38	#include <linux/random.h>
38320c70	39	#include <linux/slab.h>
b7c6538c	40	#include <linux/spinlock.h>
81aded24	41	#include <net/ip6_route.h>
1da177e4 LT	42	#include <net/icmp.h>
1da177e4 LT	43	#include <net/ipv6.h>
14c85021	44	#include <net/protocol.h>
1da177e4 LT	45	#include <linux/icmpv6.h>
1da177e4 LT	46
38320c70 HX	47	struct esp_skb_cb {
	48	struct xfrm_skb_cb xfrm;
	49	void *tmp;
	50	};
	51
	52	#define ESP_SKB_CB(__skb) ((struct esp_skb_cb *)&((__skb)->cb[0]))
	53
040253c9 MW	54	static u32 esp6_get_mtu(struct xfrm_state *x, int mtu);
040253c9 MW	55
38320c70 HX	56	/*
	57	* Allocate an AEAD request structure with extra space for SG and IV.
	58	*
d212a4c2 SK	59	* For alignment considerations the upper 32 bits of the sequence number are
	60	* placed at the front, if present. Followed by the IV, the request and finally
	61	* the SG list.
38320c70 HX	62	*
	63	* TODO: Use spare space in skb for this where possible.
	64	*/
d212a4c2	65	static void esp_alloc_tmp(struct crypto_aead aead, int nfrags, int seqihlen)
38320c70 HX	66	{
	67	unsigned int len;
	68
d212a4c2 SK	69	len = seqihlen;
	70
	71	len += crypto_aead_ivsize(aead);
	72
38320c70 HX	73	if (len) {
	74	len += crypto_aead_alignmask(aead) &
	75	~(crypto_tfm_ctx_alignment() - 1);
	76	len = ALIGN(len, crypto_tfm_ctx_alignment());
	77	}
	78
	79	len += sizeof(struct aead_givcrypt_request) + crypto_aead_reqsize(aead);
	80	len = ALIGN(len, __alignof__(struct scatterlist));
	81
	82	len += sizeof(struct scatterlist) * nfrags;
	83
	84	return kmalloc(len, GFP_ATOMIC);
	85	}
	86
d212a4c2 SK	87	static inline __be32 esp_tmp_seqhi(void tmp)
	88	{
	89	return PTR_ALIGN((__be32 *)tmp, __alignof__(__be32));
	90	}
	91
	92	static inline u8 esp_tmp_iv(struct crypto_aead aead, void *tmp, int seqhilen)
38320c70 HX	93	{
38320c70 HX	94	return crypto_aead_ivsize(aead) ?
d212a4c2 SK	95	PTR_ALIGN((u8 *)tmp + seqhilen,
d212a4c2 SK	96	crypto_aead_alignmask(aead) + 1) : tmp + seqhilen;
38320c70 HX	97	}
	98
	99	static inline struct aead_givcrypt_request *esp_tmp_givreq(
	100	struct crypto_aead aead, u8 iv)
	101	{
	102	struct aead_givcrypt_request *req;
	103
	104	req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead),
	105	crypto_tfm_ctx_alignment());
	106	aead_givcrypt_set_tfm(req, aead);
	107	return req;
	108	}
	109
	110	static inline struct aead_request esp_tmp_req(struct crypto_aead aead, u8 *iv)
	111	{
	112	struct aead_request *req;
	113
	114	req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead),
	115	crypto_tfm_ctx_alignment());
	116	aead_request_set_tfm(req, aead);
	117	return req;
	118	}
	119
	120	static inline struct scatterlist esp_req_sg(struct crypto_aead aead,
	121	struct aead_request *req)
	122	{
	123	return (void *)ALIGN((unsigned long)(req + 1) +
	124	crypto_aead_reqsize(aead),
	125	__alignof__(struct scatterlist));
	126	}
	127
	128	static inline struct scatterlist *esp_givreq_sg(
	129	struct crypto_aead aead, struct aead_givcrypt_request req)
	130	{
	131	return (void *)ALIGN((unsigned long)(req + 1) +
	132	crypto_aead_reqsize(aead),
	133	__alignof__(struct scatterlist));
	134	}
	135
	136	static void esp_output_done(struct crypto_async_request *base, int err)
	137	{
	138	struct sk_buff *skb = base->data;
	139
	140	kfree(ESP_SKB_CB(skb)->tmp);
	141	xfrm_output_resume(skb, err);
	142	}
	143
1da177e4 LT	144	static int esp6_output(struct xfrm_state x, struct sk_buff skb)
	145	{
	146	int err;
87bdc48d	147	struct ip_esp_hdr *esph;
38320c70 HX	148	struct crypto_aead *aead;
	149	struct aead_givcrypt_request *req;
	150	struct scatterlist *sg;
	151	struct scatterlist *asg;
1da177e4	152	struct sk_buff *trailer;
38320c70	153	void *tmp;
1da177e4 LT	154	int blksize;
	155	int clen;
	156	int alen;
040253c9 MW	157	int plen;
040253c9 MW	158	int tfclen;
1da177e4	159	int nfrags;
d212a4c2 SK	160	int assoclen;
	161	int sglists;
	162	int seqhilen;
38320c70	163	u8 *iv;
27a884dc	164	u8 *tail;
d212a4c2	165	__be32 *seqhi;
1da177e4	166
7b277b1a	167	/* skb is pure payload to encrypt */
1c5ad13f	168	aead = x->data;
38320c70 HX	169	alen = crypto_aead_authsize(aead);
38320c70 HX	170
040253c9 MW	171	tfclen = 0;
	172	if (x->tfcpad) {
	173	struct xfrm_dst dst = (struct xfrm_dst )skb_dst(skb);
	174	u32 padto;
	175
	176	padto = min(x->tfcpad, esp6_get_mtu(x, dst->child_mtu_cached));
	177	if (skb->len < padto)
	178	tfclen = padto - skb->len;
	179	}
38320c70	180	blksize = ALIGN(crypto_aead_blocksize(aead), 4);
040253c9	181	clen = ALIGN(skb->len + 2 + tfclen, blksize);
040253c9	182	plen = clen - skb->len - tfclen;
1da177e4	183
040253c9 MW	184	err = skb_cow_data(skb, tfclen + plen + alen, &trailer);
040253c9 MW	185	if (err < 0)
1da177e4	186	goto error;
38320c70 HX	187	nfrags = err;
38320c70 HX	188
d212a4c2 SK	189	assoclen = sizeof(*esph);
	190	sglists = 1;
	191	seqhilen = 0;
	192
	193	if (x->props.flags & XFRM_STATE_ESN) {
	194	sglists += 2;
	195	seqhilen += sizeof(__be32);
	196	assoclen += seqhilen;
	197	}
	198
	199	tmp = esp_alloc_tmp(aead, nfrags + sglists, seqhilen);
48f125ce JL	200	if (!tmp) {
48f125ce JL	201	err = -ENOMEM;
38320c70	202	goto error;
48f125ce	203	}
38320c70	204
d212a4c2 SK	205	seqhi = esp_tmp_seqhi(tmp);
d212a4c2 SK	206	iv = esp_tmp_iv(aead, tmp, seqhilen);
38320c70 HX	207	req = esp_tmp_givreq(aead, iv);
38320c70 HX	208	asg = esp_givreq_sg(aead, req);
d212a4c2	209	sg = asg + sglists;
1da177e4 LT	210
1da177e4 LT	211	/* Fill padding... */
27a884dc	212	tail = skb_tail_pointer(trailer);
040253c9 MW	213	if (tfclen) {
	214	memset(tail, 0, tfclen);
	215	tail += tfclen;
	216	}
1da177e4 LT	217	do {
1da177e4 LT	218	int i;
040253c9	219	for (i = 0; i < plen - 2; i++)
27a884dc	220	tail[i] = i + 1;
1da177e4	221	} while (0);
040253c9 MW	222	tail[plen - 2] = plen - 2;
040253c9 MW	223	tail[plen - 1] = *skb_mac_header(skb);
38320c70	224	pskb_put(skb, trailer, clen - skb->len + alen);
1da177e4	225
7b277b1a	226	skb_push(skb, -skb_network_offset(skb));
87bdc48d	227	esph = ip_esp_hdr(skb);
007f0211	228	*skb_mac_header(skb) = IPPROTO_ESP;
1da177e4 LT	229
1da177e4 LT	230	esph->spi = x->id.spi;
1ce3644a	231	esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
1da177e4	232
38320c70 HX	233	sg_init_table(sg, nfrags);
	234	skb_to_sgvec(skb, sg,
	235	esph->enc_data + crypto_aead_ivsize(aead) - skb->data,
	236	clen + alen);
d212a4c2 SK	237
	238	if ((x->props.flags & XFRM_STATE_ESN)) {
	239	sg_init_table(asg, 3);
	240	sg_set_buf(asg, &esph->spi, sizeof(__be32));
	241	*seqhi = htonl(XFRM_SKB_CB(skb)->seq.output.hi);
	242	sg_set_buf(asg + 1, seqhi, seqhilen);
	243	sg_set_buf(asg + 2, &esph->seq_no, sizeof(__be32));
	244	} else
	245	sg_init_one(asg, esph, sizeof(*esph));
b7c6538c	246
38320c70 HX	247	aead_givcrypt_set_callback(req, 0, esp_output_done, skb);
38320c70 HX	248	aead_givcrypt_set_crypt(req, sg, sg, clen, iv);
d212a4c2	249	aead_givcrypt_set_assoc(req, asg, assoclen);
b318e0e4	250	aead_givcrypt_set_giv(req, esph->enc_data,
1ce3644a	251	XFRM_SKB_CB(skb)->seq.output.low);
1da177e4	252
38320c70 HX	253	ESP_SKB_CB(skb)->tmp = tmp;
	254	err = crypto_aead_givencrypt(req);
	255	if (err == -EINPROGRESS)
	256	goto error;
1da177e4	257
38320c70 HX	258	if (err == -EBUSY)
	259	err = NET_XMIT_DROP;
	260
	261	kfree(tmp);
	262
	263	error:
	264	return err;
	265	}
	266
	267	static int esp_input_done2(struct sk_buff *skb, int err)
	268	{
	269	struct xfrm_state *x = xfrm_input_state(skb);
1c5ad13f	270	struct crypto_aead *aead = x->data;
38320c70 HX	271	int alen = crypto_aead_authsize(aead);
	272	int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead);
	273	int elen = skb->len - hlen;
	274	int hdr_len = skb_network_header_len(skb);
	275	int padlen;
	276	u8 nexthdr[2];
	277
	278	kfree(ESP_SKB_CB(skb)->tmp);
1da177e4	279
6b7326c8	280	if (unlikely(err))
38320c70	281	goto out;
6b7326c8	282
38320c70 HX	283	if (skb_copy_bits(skb, skb->len - alen - 2, nexthdr, 2))
38320c70 HX	284	BUG();
1da177e4	285
38320c70 HX	286	err = -EINVAL;
	287	padlen = nexthdr[0];
	288	if (padlen + 2 + alen >= elen) {
ba7a46f1 JP	289	net_dbg_ratelimited("ipsec esp packet is garbage padlen=%d, elen=%d\n",
ba7a46f1 JP	290	padlen + 2, elen - alen);
38320c70	291	goto out;
1da177e4 LT	292	}
1da177e4 LT	293
38320c70	294	/* ... check padding bits here. Silly. :-) */
b7c6538c	295
38320c70 HX	296	pskb_trim(skb, skb->len - alen - padlen - 2);
38320c70 HX	297	__skb_pull(skb, hlen);
a9403f8a LR	298	if (x->props.mode == XFRM_MODE_TUNNEL)
	299	skb_reset_transport_header(skb);
	300	else
	301	skb_set_transport_header(skb, -hdr_len);
38320c70 HX	302
	303	err = nexthdr[1];
	304
	305	/* RFC4303: Drop dummy packets without any error */
	306	if (err == IPPROTO_NONE)
	307	err = -EINVAL;
	308
	309	out:
1da177e4 LT	310	return err;
	311	}
	312
38320c70 HX	313	static void esp_input_done(struct crypto_async_request *base, int err)
	314	{
	315	struct sk_buff *skb = base->data;
	316
	317	xfrm_input_resume(skb, esp_input_done2(skb, err));
	318	}
	319
e695633e	320	static int esp6_input(struct xfrm_state x, struct sk_buff skb)
1da177e4	321	{
87bdc48d	322	struct ip_esp_hdr *esph;
1c5ad13f	323	struct crypto_aead *aead = x->data;
38320c70	324	struct aead_request *req;
1da177e4	325	struct sk_buff *trailer;
38320c70	326	int elen = skb->len - sizeof(*esph) - crypto_aead_ivsize(aead);
1da177e4	327	int nfrags;
d212a4c2 SK	328	int assoclen;
	329	int sglists;
	330	int seqhilen;
1da177e4	331	int ret = 0;
38320c70	332	void *tmp;
d212a4c2	333	__be32 *seqhi;
38320c70 HX	334	u8 *iv;
	335	struct scatterlist *sg;
	336	struct scatterlist *asg;
1da177e4	337
920fc941	338	if (!pskb_may_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead))) {
1da177e4	339	ret = -EINVAL;
31a4ab93	340	goto out;
1da177e4 LT	341	}
1da177e4 LT	342
38320c70	343	if (elen <= 0) {
1da177e4	344	ret = -EINVAL;
31a4ab93	345	goto out;
1da177e4	346	}
1da177e4	347
e5d08d71 IM	348	nfrags = skb_cow_data(skb, 0, &trailer);
e5d08d71 IM	349	if (nfrags < 0) {
0ebea8ef HX	350	ret = -EINVAL;
	351	goto out;
	352	}
	353
38320c70	354	ret = -ENOMEM;
d212a4c2 SK	355
	356	assoclen = sizeof(*esph);
	357	sglists = 1;
	358	seqhilen = 0;
	359
	360	if (x->props.flags & XFRM_STATE_ESN) {
	361	sglists += 2;
	362	seqhilen += sizeof(__be32);
	363	assoclen += seqhilen;
	364	}
	365
	366	tmp = esp_alloc_tmp(aead, nfrags + sglists, seqhilen);
38320c70 HX	367	if (!tmp)
38320c70 HX	368	goto out;
1da177e4	369
38320c70	370	ESP_SKB_CB(skb)->tmp = tmp;
d212a4c2 SK	371	seqhi = esp_tmp_seqhi(tmp);
d212a4c2 SK	372	iv = esp_tmp_iv(aead, tmp, seqhilen);
38320c70 HX	373	req = esp_tmp_req(aead, iv);
38320c70 HX	374	asg = esp_req_sg(aead, req);
c0a56e64	375	sg = asg + sglists;
1da177e4	376
38320c70	377	skb->ip_summed = CHECKSUM_NONE;
1da177e4	378
87bdc48d	379	esph = (struct ip_esp_hdr *)skb->data;
1da177e4 LT	380
1da177e4 LT	381	/* Get ivec. This can be wrong, check against another impls. */
38320c70	382	iv = esph->enc_data;
0ebea8ef	383
38320c70 HX	384	sg_init_table(sg, nfrags);
38320c70 HX	385	skb_to_sgvec(skb, sg, sizeof(*esph) + crypto_aead_ivsize(aead), elen);
d212a4c2 SK	386
	387	if ((x->props.flags & XFRM_STATE_ESN)) {
	388	sg_init_table(asg, 3);
	389	sg_set_buf(asg, &esph->spi, sizeof(__be32));
	390	*seqhi = XFRM_SKB_CB(skb)->seq.input.hi;
	391	sg_set_buf(asg + 1, seqhi, seqhilen);
	392	sg_set_buf(asg + 2, &esph->seq_no, sizeof(__be32));
	393	} else
	394	sg_init_one(asg, esph, sizeof(*esph));
0ebea8ef	395
38320c70 HX	396	aead_request_set_callback(req, 0, esp_input_done, skb);
38320c70 HX	397	aead_request_set_crypt(req, sg, sg, elen, iv);
d212a4c2	398	aead_request_set_assoc(req, asg, assoclen);
1da177e4	399
38320c70 HX	400	ret = crypto_aead_decrypt(req);
	401	if (ret == -EINPROGRESS)
	402	goto out;
95a02cfd	403
38320c70	404	ret = esp_input_done2(skb, ret);
1da177e4 LT	405
1da177e4 LT	406	out:
1da177e4 LT	407	return ret;
	408	}
	409
c5c25238	410	static u32 esp6_get_mtu(struct xfrm_state *x, int mtu)
1da177e4	411	{
1c5ad13f MK	412	struct crypto_aead *aead = x->data;
1c5ad13f MK	413	u32 blksize = ALIGN(crypto_aead_blocksize(aead), 4);
91657eaf	414	unsigned int net_adj;
1da177e4	415
91657eaf BP	416	if (x->props.mode != XFRM_MODE_TUNNEL)
	417	net_adj = sizeof(struct ipv6hdr);
	418	else
	419	net_adj = 0;
c5c25238	420
1c5ad13f	421	return ((mtu - x->props.header_len - crypto_aead_authsize(aead) -
123b0d1b	422	net_adj) & ~(blksize - 1)) + net_adj - 2;
1da177e4 LT	423	}
1da177e4 LT	424
d5860c5c SK	425	static int esp6_err(struct sk_buff skb, struct inet6_skb_parm opt,
d5860c5c SK	426	u8 type, u8 code, int offset, __be32 info)
1da177e4	427	{
4fb236ba	428	struct net *net = dev_net(skb->dev);
b71d1d42	429	const struct ipv6hdr iph = (const struct ipv6hdr )skb->data;
87bdc48d	430	struct ip_esp_hdr esph = (struct ip_esp_hdr )(skb->data + offset);
1da177e4 LT	431	struct xfrm_state *x;
1da177e4 LT	432
b3b2b9e1	433	if (type != ICMPV6_PKT_TOOBIG &&
ec18d9a2	434	type != NDISC_REDIRECT)
d5860c5c	435	return 0;
1da177e4	436
b71d1d42 ED	437	x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
b71d1d42 ED	438	esph->spi, IPPROTO_ESP, AF_INET6);
1da177e4	439	if (!x)
d5860c5c	440	return 0;
ec18d9a2 DM	441
ec18d9a2 DM	442	if (type == NDISC_REDIRECT)
b55b76b2	443	ip6_redirect(skb, net, skb->dev->ifindex, 0);
ec18d9a2 DM	444	else
ec18d9a2 DM	445	ip6_update_pmtu(skb, net, info, 0, 0);
1da177e4	446	xfrm_state_put(x);
d5860c5c SK	447
d5860c5c SK	448	return 0;
1da177e4 LT	449	}
	450
	451	static void esp6_destroy(struct xfrm_state *x)
	452	{
1c5ad13f	453	struct crypto_aead *aead = x->data;
1da177e4	454
1c5ad13f	455	if (!aead)
1da177e4 LT	456	return;
1da177e4 LT	457
1c5ad13f	458	crypto_free_aead(aead);
1da177e4 LT	459	}
1da177e4 LT	460
1a6509d9 HX	461	static int esp_init_aead(struct xfrm_state *x)
1a6509d9 HX	462	{
1a6509d9 HX	463	struct crypto_aead *aead;
	464	int err;
	465
	466	aead = crypto_alloc_aead(x->aead->alg_name, 0, 0);
	467	err = PTR_ERR(aead);
	468	if (IS_ERR(aead))
	469	goto error;
	470
1c5ad13f	471	x->data = aead;
1a6509d9 HX	472
	473	err = crypto_aead_setkey(aead, x->aead->alg_key,
	474	(x->aead->alg_key_len + 7) / 8);
	475	if (err)
	476	goto error;
	477
	478	err = crypto_aead_setauthsize(aead, x->aead->alg_icv_len / 8);
	479	if (err)
	480	goto error;
	481
	482	error:
	483	return err;
	484	}
	485
	486	static int esp_init_authenc(struct xfrm_state *x)
1da177e4	487	{
38320c70 HX	488	struct crypto_aead *aead;
	489	struct crypto_authenc_key_param *param;
	490	struct rtattr *rta;
	491	char *key;
	492	char *p;
	493	char authenc_name[CRYPTO_MAX_ALG_NAME];
38320c70 HX	494	unsigned int keylen;
38320c70 HX	495	int err;
1da177e4	496
1a6509d9	497	err = -EINVAL;
63159f29	498	if (!x->ealg)
1a6509d9	499	goto error;
38320c70	500
1a6509d9	501	err = -ENAMETOOLONG;
d212a4c2 SK	502
	503	if ((x->props.flags & XFRM_STATE_ESN)) {
	504	if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
	505	"authencesn(%s,%s)",
	506	x->aalg ? x->aalg->alg_name : "digest_null",
	507	x->ealg->alg_name) >= CRYPTO_MAX_ALG_NAME)
	508	goto error;
	509	} else {
	510	if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
	511	"authenc(%s,%s)",
	512	x->aalg ? x->aalg->alg_name : "digest_null",
	513	x->ealg->alg_name) >= CRYPTO_MAX_ALG_NAME)
	514	goto error;
	515	}
38320c70 HX	516
	517	aead = crypto_alloc_aead(authenc_name, 0, 0);
	518	err = PTR_ERR(aead);
	519	if (IS_ERR(aead))
	520	goto error;
	521
1c5ad13f	522	x->data = aead;
38320c70 HX	523
	524	keylen = (x->aalg ? (x->aalg->alg_key_len + 7) / 8 : 0) +
	525	(x->ealg->alg_key_len + 7) / 8 + RTA_SPACE(sizeof(*param));
	526	err = -ENOMEM;
	527	key = kmalloc(keylen, GFP_KERNEL);
	528	if (!key)
	529	goto error;
	530
	531	p = key;
	532	rta = (void *)p;
	533	rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM;
	534	rta->rta_len = RTA_LENGTH(sizeof(*param));
	535	param = RTA_DATA(rta);
	536	p += RTA_SPACE(sizeof(*param));
	537
1da177e4 LT	538	if (x->aalg) {
	539	struct xfrm_algo_desc *aalg_desc;
	540
38320c70 HX	541	memcpy(p, x->aalg->alg_key, (x->aalg->alg_key_len + 7) / 8);
38320c70 HX	542	p += (x->aalg->alg_key_len + 7) / 8;
1ab1457c	543
1da177e4 LT	544	aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
1da177e4 LT	545	BUG_ON(!aalg_desc);
1ab1457c	546
38320c70	547	err = -EINVAL;
45083497	548	if (aalg_desc->uinfo.auth.icv_fullbits / 8 !=
38320c70	549	crypto_aead_authsize(aead)) {
45083497 JP	550	pr_info("ESP: %s digestsize %u != %hu\n",
	551	x->aalg->alg_name,
	552	crypto_aead_authsize(aead),
	553	aalg_desc->uinfo.auth.icv_fullbits / 8);
38320c70	554	goto free_key;
1da177e4	555	}
1ab1457c	556
38320c70	557	err = crypto_aead_setauthsize(
8f8a088c	558	aead, x->aalg->alg_trunc_len / 8);
38320c70 HX	559	if (err)
38320c70 HX	560	goto free_key;
1da177e4	561	}
38320c70	562
38320c70 HX	563	param->enckeylen = cpu_to_be32((x->ealg->alg_key_len + 7) / 8);
	564	memcpy(p, x->ealg->alg_key, (x->ealg->alg_key_len + 7) / 8);
	565
	566	err = crypto_aead_setkey(aead, key, keylen);
	567
	568	free_key:
	569	kfree(key);
	570
1a6509d9 HX	571	error:
	572	return err;
	573	}
	574
	575	static int esp6_init_state(struct xfrm_state *x)
	576	{
1a6509d9 HX	577	struct crypto_aead *aead;
	578	u32 align;
	579	int err;
	580
	581	if (x->encap)
	582	return -EINVAL;
	583
1c5ad13f	584	x->data = NULL;
1a6509d9 HX	585
	586	if (x->aead)
	587	err = esp_init_aead(x);
	588	else
	589	err = esp_init_authenc(x);
	590
38320c70	591	if (err)
1da177e4	592	goto error;
38320c70	593
1c5ad13f	594	aead = x->data;
1a6509d9	595
38320c70 HX	596	x->props.header_len = sizeof(struct ip_esp_hdr) +
38320c70 HX	597	crypto_aead_ivsize(aead);
ca68145f HX	598	switch (x->props.mode) {
ca68145f HX	599	case XFRM_MODE_BEET:
abf5cdb8 JK	600	if (x->sel.family != AF_INET6)
abf5cdb8 JK	601	x->props.header_len += IPV4_BEET_PHMAXLEN +
67ba4152	602	(sizeof(struct ipv6hdr) - sizeof(struct iphdr));
abf5cdb8	603	break;
ca68145f HX	604	case XFRM_MODE_TRANSPORT:
	605	break;
	606	case XFRM_MODE_TUNNEL:
1da177e4	607	x->props.header_len += sizeof(struct ipv6hdr);
ea2c47b4	608	break;
ca68145f HX	609	default:
	610	goto error;
	611	}
38320c70 HX	612
38320c70 HX	613	align = ALIGN(crypto_aead_blocksize(aead), 4);
1c5ad13f	614	x->props.trailer_len = align + 1 + crypto_aead_authsize(aead);
1da177e4 LT	615
1da177e4 LT	616	error:
38320c70	617	return err;
1da177e4 LT	618	}
1da177e4 LT	619
d5860c5c SK	620	static int esp6_rcv_cb(struct sk_buff *skb, int err)
	621	{
	622	return 0;
	623	}
	624
cc24beca	625	static const struct xfrm_type esp6_type = {
1da177e4	626	.description = "ESP6",
cc24beca IM	627	.owner = THIS_MODULE,
cc24beca IM	628	.proto = IPPROTO_ESP,
436a0a40	629	.flags = XFRM_TYPE_REPLAY_PROT,
1da177e4 LT	630	.init_state = esp6_init_state,
1da177e4 LT	631	.destructor = esp6_destroy,
c5c25238	632	.get_mtu = esp6_get_mtu,
1da177e4	633	.input = esp6_input,
aee5adb4 MN	634	.output = esp6_output,
aee5adb4 MN	635	.hdr_offset = xfrm6_find_1stfragopt,
1da177e4 LT	636	};
1da177e4 LT	637
d5860c5c SK	638	static struct xfrm6_protocol esp6_protocol = {
	639	.handler = xfrm6_rcv,
	640	.cb_handler = esp6_rcv_cb,
1da177e4	641	.err_handler = esp6_err,
d5860c5c	642	.priority = 0,
1da177e4 LT	643	};
	644
	645	static int __init esp6_init(void)
	646	{
	647	if (xfrm_register_type(&esp6_type, AF_INET6) < 0) {
f3213831	648	pr_info("%s: can't add xfrm type\n", __func__);
1da177e4 LT	649	return -EAGAIN;
1da177e4 LT	650	}
d5860c5c	651	if (xfrm6_protocol_register(&esp6_protocol, IPPROTO_ESP) < 0) {
f3213831	652	pr_info("%s: can't add protocol\n", __func__);
1da177e4 LT	653	xfrm_unregister_type(&esp6_type, AF_INET6);
	654	return -EAGAIN;
	655	}
	656
	657	return 0;
	658	}
	659
	660	static void __exit esp6_fini(void)
	661	{
d5860c5c	662	if (xfrm6_protocol_deregister(&esp6_protocol, IPPROTO_ESP) < 0)
f3213831	663	pr_info("%s: can't remove protocol\n", __func__);
1da177e4	664	if (xfrm_unregister_type(&esp6_type, AF_INET6) < 0)
f3213831	665	pr_info("%s: can't remove xfrm type\n", __func__);
1da177e4 LT	666	}
	667
	668	module_init(esp6_init);
	669	module_exit(esp6_fini);
	670
	671	MODULE_LICENSE("GPL");
d3d6dd3a	672	MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_ESP);