[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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * 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;
	struct esp_data *esp = x->data;

	/* skb is pure payload to encrypt */
	aead = esp->aead;
	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);
	if (esp->padlen)
		clen = ALIGN(clen, esp->padlen);
	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 esp_data *esp = x->data;
	struct crypto_aead *aead = esp->aead;
	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) {
		LIMIT_NETDEBUG(KERN_WARNING "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 esp_data *esp = x->data;
	struct crypto_aead *aead = esp->aead;
	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;
	}

	if ((nfrags = skb_cow_data(skb, 0, &trailer)) < 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 esp_data *esp = x->data;
	u32 blksize = ALIGN(crypto_aead_blocksize(esp->aead), 4);
	u32 align = max_t(u32, blksize, esp->padlen);
	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(esp->aead) -
		 net_adj) & ~(align - 1)) + (net_adj - 2);
}

static void 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_DEST_UNREACH &&
	    type != ICMPV6_PKT_TOOBIG &&
	    type != NDISC_REDIRECT)
		return;

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

	if (type == NDISC_REDIRECT)
		ip6_redirect(skb, net, 0, 0);
	else
		ip6_update_pmtu(skb, net, info, 0, 0);
	xfrm_state_put(x);
}

static void esp6_destroy(struct xfrm_state *x)
{
	struct esp_data *esp = x->data;

	if (!esp)
		return;

	crypto_free_aead(esp->aead);
	kfree(esp);
}

static int esp_init_aead(struct xfrm_state *x)
{
	struct esp_data *esp = x->data;
	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;

	esp->aead = 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 esp_data *esp = x->data;
	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 == NULL)
		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;

	esp->aead = 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)) {
			NETDEBUG(KERN_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 esp_data *esp;
	struct crypto_aead *aead;
	u32 align;
	int err;

	if (x->encap)
		return -EINVAL;

	esp = kzalloc(sizeof(*esp), GFP_KERNEL);
	if (esp == NULL)
		return -ENOMEM;

	x->data = esp;

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

	if (err)
		goto error;

	aead = esp->aead;

	esp->padlen = 0;

	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);
	if (esp->padlen)
		align = max_t(u32, align, esp->padlen);
	x->props.trailer_len = align + 1 + crypto_aead_authsize(esp->aead);

error:
	return err;
}

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 const struct inet6_protocol esp6_protocol = {
	.handler 	=	xfrm6_rcv,
	.err_handler	=	esp6_err,
	.flags		=	INET6_PROTO_NOPOLICY,
};

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 (inet6_add_protocol(&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 (inet6_del_protocol(&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 LT	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write to the Free Software
	16	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	17	*
	18	* Authors
	19	*
1ab1457c	20	* Mitsuru KANDA @USAGI : IPv6 Support
1da177e4 LT	21	* Kazunori MIYAZAWA @USAGI :
1da177e4 LT	22	* Kunihiro Ishiguro <kunihiro@ipinfusion.com>
1ab1457c	23	*
1da177e4 LT	24	* This file is derived from net/ipv4/esp.c
	25	*/
	26
f3213831 JP	27	#define pr_fmt(fmt) "IPv6: " fmt
f3213831 JP	28
38320c70 HX	29	#include <crypto/aead.h>
38320c70 HX	30	#include <crypto/authenc.h>
6b7326c8	31	#include <linux/err.h>
1da177e4 LT	32	#include <linux/module.h>
	33	#include <net/ip.h>
	34	#include <net/xfrm.h>
	35	#include <net/esp.h>
72998d8c	36	#include <linux/scatterlist.h>
a02a6422	37	#include <linux/kernel.h>
1da177e4 LT	38	#include <linux/pfkeyv2.h>
1da177e4 LT	39	#include <linux/random.h>
38320c70	40	#include <linux/slab.h>
b7c6538c	41	#include <linux/spinlock.h>
81aded24	42	#include <net/ip6_route.h>
1da177e4 LT	43	#include <net/icmp.h>
1da177e4 LT	44	#include <net/ipv6.h>
14c85021	45	#include <net/protocol.h>
1da177e4 LT	46	#include <linux/icmpv6.h>
1da177e4 LT	47
38320c70 HX	48	struct esp_skb_cb {
	49	struct xfrm_skb_cb xfrm;
	50	void *tmp;
	51	};
	52
	53	#define ESP_SKB_CB(__skb) ((struct esp_skb_cb *)&((__skb)->cb[0]))
	54
040253c9 MW	55	static u32 esp6_get_mtu(struct xfrm_state *x, int mtu);
040253c9 MW	56
38320c70 HX	57	/*
	58	* Allocate an AEAD request structure with extra space for SG and IV.
	59	*
d212a4c2 SK	60	* For alignment considerations the upper 32 bits of the sequence number are
	61	* placed at the front, if present. Followed by the IV, the request and finally
	62	* the SG list.
38320c70 HX	63	*
	64	* TODO: Use spare space in skb for this where possible.
	65	*/
d212a4c2	66	static void esp_alloc_tmp(struct crypto_aead aead, int nfrags, int seqihlen)
38320c70 HX	67	{
	68	unsigned int len;
	69
d212a4c2 SK	70	len = seqihlen;
	71
	72	len += crypto_aead_ivsize(aead);
	73
38320c70 HX	74	if (len) {
	75	len += crypto_aead_alignmask(aead) &
	76	~(crypto_tfm_ctx_alignment() - 1);
	77	len = ALIGN(len, crypto_tfm_ctx_alignment());
	78	}
	79
	80	len += sizeof(struct aead_givcrypt_request) + crypto_aead_reqsize(aead);
	81	len = ALIGN(len, __alignof__(struct scatterlist));
	82
	83	len += sizeof(struct scatterlist) * nfrags;
	84
	85	return kmalloc(len, GFP_ATOMIC);
	86	}
	87
d212a4c2 SK	88	static inline __be32 esp_tmp_seqhi(void tmp)
	89	{
	90	return PTR_ALIGN((__be32 *)tmp, __alignof__(__be32));
	91	}
	92
	93	static inline u8 esp_tmp_iv(struct crypto_aead aead, void *tmp, int seqhilen)
38320c70 HX	94	{
38320c70 HX	95	return crypto_aead_ivsize(aead) ?
d212a4c2 SK	96	PTR_ALIGN((u8 *)tmp + seqhilen,
d212a4c2 SK	97	crypto_aead_alignmask(aead) + 1) : tmp + seqhilen;
38320c70 HX	98	}
	99
	100	static inline struct aead_givcrypt_request *esp_tmp_givreq(
	101	struct crypto_aead aead, u8 iv)
	102	{
	103	struct aead_givcrypt_request *req;
	104
	105	req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead),
	106	crypto_tfm_ctx_alignment());
	107	aead_givcrypt_set_tfm(req, aead);
	108	return req;
	109	}
	110
	111	static inline struct aead_request esp_tmp_req(struct crypto_aead aead, u8 *iv)
	112	{
	113	struct aead_request *req;
	114
	115	req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead),
	116	crypto_tfm_ctx_alignment());
	117	aead_request_set_tfm(req, aead);
	118	return req;
	119	}
	120
	121	static inline struct scatterlist esp_req_sg(struct crypto_aead aead,
	122	struct aead_request *req)
	123	{
	124	return (void *)ALIGN((unsigned long)(req + 1) +
	125	crypto_aead_reqsize(aead),
	126	__alignof__(struct scatterlist));
	127	}
	128
	129	static inline struct scatterlist *esp_givreq_sg(
	130	struct crypto_aead aead, struct aead_givcrypt_request req)
	131	{
	132	return (void *)ALIGN((unsigned long)(req + 1) +
	133	crypto_aead_reqsize(aead),
	134	__alignof__(struct scatterlist));
	135	}
	136
	137	static void esp_output_done(struct crypto_async_request *base, int err)
	138	{
	139	struct sk_buff *skb = base->data;
	140
	141	kfree(ESP_SKB_CB(skb)->tmp);
	142	xfrm_output_resume(skb, err);
	143	}
	144
1da177e4 LT	145	static int esp6_output(struct xfrm_state x, struct sk_buff skb)
	146	{
	147	int err;
87bdc48d	148	struct ip_esp_hdr *esph;
38320c70 HX	149	struct crypto_aead *aead;
	150	struct aead_givcrypt_request *req;
	151	struct scatterlist *sg;
	152	struct scatterlist *asg;
1da177e4	153	struct sk_buff *trailer;
38320c70	154	void *tmp;
1da177e4 LT	155	int blksize;
	156	int clen;
	157	int alen;
040253c9 MW	158	int plen;
040253c9 MW	159	int tfclen;
1da177e4	160	int nfrags;
d212a4c2 SK	161	int assoclen;
	162	int sglists;
	163	int seqhilen;
38320c70	164	u8 *iv;
27a884dc	165	u8 *tail;
d212a4c2	166	__be32 *seqhi;
ea2ae17d	167	struct esp_data *esp = x->data;
1da177e4	168
7b277b1a	169	/* skb is pure payload to encrypt */
38320c70 HX	170	aead = esp->aead;
	171	alen = crypto_aead_authsize(aead);
	172
040253c9 MW	173	tfclen = 0;
	174	if (x->tfcpad) {
	175	struct xfrm_dst dst = (struct xfrm_dst )skb_dst(skb);
	176	u32 padto;
	177
	178	padto = min(x->tfcpad, esp6_get_mtu(x, dst->child_mtu_cached));
	179	if (skb->len < padto)
	180	tfclen = padto - skb->len;
	181	}
38320c70	182	blksize = ALIGN(crypto_aead_blocksize(aead), 4);
040253c9	183	clen = ALIGN(skb->len + 2 + tfclen, blksize);
38320c70 HX	184	if (esp->padlen)
38320c70 HX	185	clen = ALIGN(clen, esp->padlen);
040253c9	186	plen = clen - skb->len - tfclen;
1da177e4	187
040253c9 MW	188	err = skb_cow_data(skb, tfclen + plen + alen, &trailer);
040253c9 MW	189	if (err < 0)
1da177e4	190	goto error;
38320c70 HX	191	nfrags = err;
38320c70 HX	192
d212a4c2 SK	193	assoclen = sizeof(*esph);
	194	sglists = 1;
	195	seqhilen = 0;
	196
	197	if (x->props.flags & XFRM_STATE_ESN) {
	198	sglists += 2;
	199	seqhilen += sizeof(__be32);
	200	assoclen += seqhilen;
	201	}
	202
	203	tmp = esp_alloc_tmp(aead, nfrags + sglists, seqhilen);
48f125ce JL	204	if (!tmp) {
48f125ce JL	205	err = -ENOMEM;
38320c70	206	goto error;
48f125ce	207	}
38320c70	208
d212a4c2 SK	209	seqhi = esp_tmp_seqhi(tmp);
d212a4c2 SK	210	iv = esp_tmp_iv(aead, tmp, seqhilen);
38320c70 HX	211	req = esp_tmp_givreq(aead, iv);
38320c70 HX	212	asg = esp_givreq_sg(aead, req);
d212a4c2	213	sg = asg + sglists;
1da177e4 LT	214
1da177e4 LT	215	/* Fill padding... */
27a884dc	216	tail = skb_tail_pointer(trailer);
040253c9 MW	217	if (tfclen) {
	218	memset(tail, 0, tfclen);
	219	tail += tfclen;
	220	}
1da177e4 LT	221	do {
1da177e4 LT	222	int i;
040253c9	223	for (i = 0; i < plen - 2; i++)
27a884dc	224	tail[i] = i + 1;
1da177e4	225	} while (0);
040253c9 MW	226	tail[plen - 2] = plen - 2;
040253c9 MW	227	tail[plen - 1] = *skb_mac_header(skb);
38320c70	228	pskb_put(skb, trailer, clen - skb->len + alen);
1da177e4	229
7b277b1a	230	skb_push(skb, -skb_network_offset(skb));
87bdc48d	231	esph = ip_esp_hdr(skb);
007f0211	232	*skb_mac_header(skb) = IPPROTO_ESP;
1da177e4 LT	233
1da177e4 LT	234	esph->spi = x->id.spi;
1ce3644a	235	esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
1da177e4	236
38320c70 HX	237	sg_init_table(sg, nfrags);
	238	skb_to_sgvec(skb, sg,
	239	esph->enc_data + crypto_aead_ivsize(aead) - skb->data,
	240	clen + alen);
d212a4c2 SK	241
	242	if ((x->props.flags & XFRM_STATE_ESN)) {
	243	sg_init_table(asg, 3);
	244	sg_set_buf(asg, &esph->spi, sizeof(__be32));
	245	*seqhi = htonl(XFRM_SKB_CB(skb)->seq.output.hi);
	246	sg_set_buf(asg + 1, seqhi, seqhilen);
	247	sg_set_buf(asg + 2, &esph->seq_no, sizeof(__be32));
	248	} else
	249	sg_init_one(asg, esph, sizeof(*esph));
b7c6538c	250
38320c70 HX	251	aead_givcrypt_set_callback(req, 0, esp_output_done, skb);
38320c70 HX	252	aead_givcrypt_set_crypt(req, sg, sg, clen, iv);
d212a4c2	253	aead_givcrypt_set_assoc(req, asg, assoclen);
b318e0e4	254	aead_givcrypt_set_giv(req, esph->enc_data,
1ce3644a	255	XFRM_SKB_CB(skb)->seq.output.low);
1da177e4	256
38320c70 HX	257	ESP_SKB_CB(skb)->tmp = tmp;
	258	err = crypto_aead_givencrypt(req);
	259	if (err == -EINPROGRESS)
	260	goto error;
1da177e4	261
38320c70 HX	262	if (err == -EBUSY)
	263	err = NET_XMIT_DROP;
	264
	265	kfree(tmp);
	266
	267	error:
	268	return err;
	269	}
	270
	271	static int esp_input_done2(struct sk_buff *skb, int err)
	272	{
	273	struct xfrm_state *x = xfrm_input_state(skb);
	274	struct esp_data *esp = x->data;
	275	struct crypto_aead *aead = esp->aead;
	276	int alen = crypto_aead_authsize(aead);
	277	int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead);
	278	int elen = skb->len - hlen;
	279	int hdr_len = skb_network_header_len(skb);
	280	int padlen;
	281	u8 nexthdr[2];
	282
	283	kfree(ESP_SKB_CB(skb)->tmp);
1da177e4	284
6b7326c8	285	if (unlikely(err))
38320c70	286	goto out;
6b7326c8	287
38320c70 HX	288	if (skb_copy_bits(skb, skb->len - alen - 2, nexthdr, 2))
38320c70 HX	289	BUG();
1da177e4	290
38320c70 HX	291	err = -EINVAL;
	292	padlen = nexthdr[0];
	293	if (padlen + 2 + alen >= elen) {
	294	LIMIT_NETDEBUG(KERN_WARNING "ipsec esp packet is garbage "
	295	"padlen=%d, elen=%d\n", padlen + 2, elen - alen);
	296	goto out;
1da177e4 LT	297	}
1da177e4 LT	298
38320c70	299	/* ... check padding bits here. Silly. :-) */
b7c6538c	300
38320c70 HX	301	pskb_trim(skb, skb->len - alen - padlen - 2);
38320c70 HX	302	__skb_pull(skb, hlen);
a9403f8a LR	303	if (x->props.mode == XFRM_MODE_TUNNEL)
	304	skb_reset_transport_header(skb);
	305	else
	306	skb_set_transport_header(skb, -hdr_len);
38320c70 HX	307
	308	err = nexthdr[1];
	309
	310	/* RFC4303: Drop dummy packets without any error */
	311	if (err == IPPROTO_NONE)
	312	err = -EINVAL;
	313
	314	out:
1da177e4 LT	315	return err;
	316	}
	317
38320c70 HX	318	static void esp_input_done(struct crypto_async_request *base, int err)
	319	{
	320	struct sk_buff *skb = base->data;
	321
	322	xfrm_input_resume(skb, esp_input_done2(skb, err));
	323	}
	324
e695633e	325	static int esp6_input(struct xfrm_state x, struct sk_buff skb)
1da177e4	326	{
87bdc48d	327	struct ip_esp_hdr *esph;
1da177e4	328	struct esp_data *esp = x->data;
38320c70 HX	329	struct crypto_aead *aead = esp->aead;
38320c70 HX	330	struct aead_request *req;
1da177e4	331	struct sk_buff *trailer;
38320c70	332	int elen = skb->len - sizeof(*esph) - crypto_aead_ivsize(aead);
1da177e4	333	int nfrags;
d212a4c2 SK	334	int assoclen;
	335	int sglists;
	336	int seqhilen;
1da177e4	337	int ret = 0;
38320c70	338	void *tmp;
d212a4c2	339	__be32 *seqhi;
38320c70 HX	340	u8 *iv;
	341	struct scatterlist *sg;
	342	struct scatterlist *asg;
1da177e4	343
920fc941	344	if (!pskb_may_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead))) {
1da177e4	345	ret = -EINVAL;
31a4ab93	346	goto out;
1da177e4 LT	347	}
1da177e4 LT	348
38320c70	349	if (elen <= 0) {
1da177e4	350	ret = -EINVAL;
31a4ab93	351	goto out;
1da177e4	352	}
1da177e4	353
0ebea8ef HX	354	if ((nfrags = skb_cow_data(skb, 0, &trailer)) < 0) {
	355	ret = -EINVAL;
	356	goto out;
	357	}
	358
38320c70	359	ret = -ENOMEM;
d212a4c2 SK	360
	361	assoclen = sizeof(*esph);
	362	sglists = 1;
	363	seqhilen = 0;
	364
	365	if (x->props.flags & XFRM_STATE_ESN) {
	366	sglists += 2;
	367	seqhilen += sizeof(__be32);
	368	assoclen += seqhilen;
	369	}
	370
	371	tmp = esp_alloc_tmp(aead, nfrags + sglists, seqhilen);
38320c70 HX	372	if (!tmp)
38320c70 HX	373	goto out;
1da177e4	374
38320c70	375	ESP_SKB_CB(skb)->tmp = tmp;
d212a4c2 SK	376	seqhi = esp_tmp_seqhi(tmp);
d212a4c2 SK	377	iv = esp_tmp_iv(aead, tmp, seqhilen);
38320c70 HX	378	req = esp_tmp_req(aead, iv);
38320c70 HX	379	asg = esp_req_sg(aead, req);
c0a56e64	380	sg = asg + sglists;
1da177e4	381
38320c70	382	skb->ip_summed = CHECKSUM_NONE;
1da177e4	383
87bdc48d	384	esph = (struct ip_esp_hdr *)skb->data;
1da177e4 LT	385
1da177e4 LT	386	/* Get ivec. This can be wrong, check against another impls. */
38320c70	387	iv = esph->enc_data;
0ebea8ef	388
38320c70 HX	389	sg_init_table(sg, nfrags);
38320c70 HX	390	skb_to_sgvec(skb, sg, sizeof(*esph) + crypto_aead_ivsize(aead), elen);
d212a4c2 SK	391
	392	if ((x->props.flags & XFRM_STATE_ESN)) {
	393	sg_init_table(asg, 3);
	394	sg_set_buf(asg, &esph->spi, sizeof(__be32));
	395	*seqhi = XFRM_SKB_CB(skb)->seq.input.hi;
	396	sg_set_buf(asg + 1, seqhi, seqhilen);
	397	sg_set_buf(asg + 2, &esph->seq_no, sizeof(__be32));
	398	} else
	399	sg_init_one(asg, esph, sizeof(*esph));
0ebea8ef	400
38320c70 HX	401	aead_request_set_callback(req, 0, esp_input_done, skb);
38320c70 HX	402	aead_request_set_crypt(req, sg, sg, elen, iv);
d212a4c2	403	aead_request_set_assoc(req, asg, assoclen);
1da177e4	404
38320c70 HX	405	ret = crypto_aead_decrypt(req);
	406	if (ret == -EINPROGRESS)
	407	goto out;
95a02cfd	408
38320c70	409	ret = esp_input_done2(skb, ret);
1da177e4 LT	410
1da177e4 LT	411	out:
1da177e4 LT	412	return ret;
	413	}
	414
c5c25238	415	static u32 esp6_get_mtu(struct xfrm_state *x, int mtu)
1da177e4 LT	416	{
1da177e4 LT	417	struct esp_data *esp = x->data;
38320c70 HX	418	u32 blksize = ALIGN(crypto_aead_blocksize(esp->aead), 4);
38320c70 HX	419	u32 align = max_t(u32, blksize, esp->padlen);
91657eaf	420	unsigned int net_adj;
1da177e4	421
91657eaf BP	422	if (x->props.mode != XFRM_MODE_TUNNEL)
	423	net_adj = sizeof(struct ipv6hdr);
	424	else
	425	net_adj = 0;
c5c25238	426
91657eaf BP	427	return ((mtu - x->props.header_len - crypto_aead_authsize(esp->aead) -
91657eaf BP	428	net_adj) & ~(align - 1)) + (net_adj - 2);
1da177e4 LT	429	}
	430
	431	static void esp6_err(struct sk_buff skb, struct inet6_skb_parm opt,
d5fdd6ba	432	u8 type, u8 code, int offset, __be32 info)
1da177e4	433	{
4fb236ba	434	struct net *net = dev_net(skb->dev);
b71d1d42	435	const struct ipv6hdr iph = (const struct ipv6hdr )skb->data;
87bdc48d	436	struct ip_esp_hdr esph = (struct ip_esp_hdr )(skb->data + offset);
1da177e4 LT	437	struct xfrm_state *x;
1da177e4 LT	438
1ab1457c	439	if (type != ICMPV6_DEST_UNREACH &&
ec18d9a2 DM	440	type != ICMPV6_PKT_TOOBIG &&
ec18d9a2 DM	441	type != NDISC_REDIRECT)
1da177e4 LT	442	return;
1da177e4 LT	443
b71d1d42 ED	444	x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
b71d1d42 ED	445	esph->spi, IPPROTO_ESP, AF_INET6);
1da177e4 LT	446	if (!x)
1da177e4 LT	447	return;
ec18d9a2 DM	448
	449	if (type == NDISC_REDIRECT)
	450	ip6_redirect(skb, net, 0, 0);
	451	else
	452	ip6_update_pmtu(skb, net, info, 0, 0);
1da177e4 LT	453	xfrm_state_put(x);
	454	}
	455
	456	static void esp6_destroy(struct xfrm_state *x)
	457	{
	458	struct esp_data *esp = x->data;
	459
	460	if (!esp)
	461	return;
	462
38320c70	463	crypto_free_aead(esp->aead);
1da177e4 LT	464	kfree(esp);
	465	}
	466
1a6509d9 HX	467	static int esp_init_aead(struct xfrm_state *x)
	468	{
	469	struct esp_data *esp = x->data;
	470	struct crypto_aead *aead;
	471	int err;
	472
	473	aead = crypto_alloc_aead(x->aead->alg_name, 0, 0);
	474	err = PTR_ERR(aead);
	475	if (IS_ERR(aead))
	476	goto error;
	477
	478	esp->aead = aead;
	479
	480	err = crypto_aead_setkey(aead, x->aead->alg_key,
	481	(x->aead->alg_key_len + 7) / 8);
	482	if (err)
	483	goto error;
	484
	485	err = crypto_aead_setauthsize(aead, x->aead->alg_icv_len / 8);
	486	if (err)
	487	goto error;
	488
	489	error:
	490	return err;
	491	}
	492
	493	static int esp_init_authenc(struct xfrm_state *x)
1da177e4	494	{
1a6509d9	495	struct esp_data *esp = x->data;
38320c70 HX	496	struct crypto_aead *aead;
	497	struct crypto_authenc_key_param *param;
	498	struct rtattr *rta;
	499	char *key;
	500	char *p;
	501	char authenc_name[CRYPTO_MAX_ALG_NAME];
38320c70 HX	502	unsigned int keylen;
38320c70 HX	503	int err;
1da177e4	504
1a6509d9	505	err = -EINVAL;
1da177e4	506	if (x->ealg == NULL)
1a6509d9	507	goto error;
38320c70	508
1a6509d9	509	err = -ENAMETOOLONG;
d212a4c2 SK	510
	511	if ((x->props.flags & XFRM_STATE_ESN)) {
	512	if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
	513	"authencesn(%s,%s)",
	514	x->aalg ? x->aalg->alg_name : "digest_null",
	515	x->ealg->alg_name) >= CRYPTO_MAX_ALG_NAME)
	516	goto error;
	517	} else {
	518	if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
	519	"authenc(%s,%s)",
	520	x->aalg ? x->aalg->alg_name : "digest_null",
	521	x->ealg->alg_name) >= CRYPTO_MAX_ALG_NAME)
	522	goto error;
	523	}
38320c70 HX	524
	525	aead = crypto_alloc_aead(authenc_name, 0, 0);
	526	err = PTR_ERR(aead);
	527	if (IS_ERR(aead))
	528	goto error;
	529
	530	esp->aead = aead;
	531
	532	keylen = (x->aalg ? (x->aalg->alg_key_len + 7) / 8 : 0) +
	533	(x->ealg->alg_key_len + 7) / 8 + RTA_SPACE(sizeof(*param));
	534	err = -ENOMEM;
	535	key = kmalloc(keylen, GFP_KERNEL);
	536	if (!key)
	537	goto error;
	538
	539	p = key;
	540	rta = (void *)p;
	541	rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM;
	542	rta->rta_len = RTA_LENGTH(sizeof(*param));
	543	param = RTA_DATA(rta);
	544	p += RTA_SPACE(sizeof(*param));
	545
1da177e4 LT	546	if (x->aalg) {
	547	struct xfrm_algo_desc *aalg_desc;
	548
38320c70 HX	549	memcpy(p, x->aalg->alg_key, (x->aalg->alg_key_len + 7) / 8);
38320c70 HX	550	p += (x->aalg->alg_key_len + 7) / 8;
1ab1457c	551
1da177e4 LT	552	aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
1da177e4 LT	553	BUG_ON(!aalg_desc);
1ab1457c	554
38320c70	555	err = -EINVAL;
1da177e4	556	if (aalg_desc->uinfo.auth.icv_fullbits/8 !=
38320c70	557	crypto_aead_authsize(aead)) {
07d4ee58 HX	558	NETDEBUG(KERN_INFO "ESP: %s digestsize %u != %hu\n",
07d4ee58 HX	559	x->aalg->alg_name,
38320c70	560	crypto_aead_authsize(aead),
07d4ee58	561	aalg_desc->uinfo.auth.icv_fullbits/8);
38320c70	562	goto free_key;
1da177e4	563	}
1ab1457c	564
38320c70	565	err = crypto_aead_setauthsize(
8f8a088c	566	aead, x->aalg->alg_trunc_len / 8);
38320c70 HX	567	if (err)
38320c70 HX	568	goto free_key;
1da177e4	569	}
38320c70	570
38320c70 HX	571	param->enckeylen = cpu_to_be32((x->ealg->alg_key_len + 7) / 8);
	572	memcpy(p, x->ealg->alg_key, (x->ealg->alg_key_len + 7) / 8);
	573
	574	err = crypto_aead_setkey(aead, key, keylen);
	575
	576	free_key:
	577	kfree(key);
	578
1a6509d9 HX	579	error:
	580	return err;
	581	}
	582
	583	static int esp6_init_state(struct xfrm_state *x)
	584	{
	585	struct esp_data *esp;
	586	struct crypto_aead *aead;
	587	u32 align;
	588	int err;
	589
	590	if (x->encap)
	591	return -EINVAL;
	592
	593	esp = kzalloc(sizeof(*esp), GFP_KERNEL);
	594	if (esp == NULL)
	595	return -ENOMEM;
	596
	597	x->data = esp;
	598
	599	if (x->aead)
	600	err = esp_init_aead(x);
	601	else
	602	err = esp_init_authenc(x);
	603
38320c70	604	if (err)
1da177e4	605	goto error;
38320c70	606
1a6509d9 HX	607	aead = esp->aead;
	608
	609	esp->padlen = 0;
	610
38320c70 HX	611	x->props.header_len = sizeof(struct ip_esp_hdr) +
38320c70 HX	612	crypto_aead_ivsize(aead);
ca68145f HX	613	switch (x->props.mode) {
ca68145f HX	614	case XFRM_MODE_BEET:
abf5cdb8 JK	615	if (x->sel.family != AF_INET6)
	616	x->props.header_len += IPV4_BEET_PHMAXLEN +
	617	(sizeof(struct ipv6hdr) - sizeof(struct iphdr));
	618	break;
ca68145f HX	619	case XFRM_MODE_TRANSPORT:
	620	break;
	621	case XFRM_MODE_TUNNEL:
1da177e4	622	x->props.header_len += sizeof(struct ipv6hdr);
ea2c47b4	623	break;
ca68145f HX	624	default:
	625	goto error;
	626	}
38320c70 HX	627
	628	align = ALIGN(crypto_aead_blocksize(aead), 4);
	629	if (esp->padlen)
	630	align = max_t(u32, align, esp->padlen);
	631	x->props.trailer_len = align + 1 + crypto_aead_authsize(esp->aead);
1da177e4 LT	632
1da177e4 LT	633	error:
38320c70	634	return err;
1da177e4 LT	635	}
1da177e4 LT	636
533cb5b0	637	static const struct xfrm_type esp6_type =
1da177e4 LT	638	{
	639	.description = "ESP6",
	640	.owner = THIS_MODULE,
	641	.proto = IPPROTO_ESP,
436a0a40	642	.flags = XFRM_TYPE_REPLAY_PROT,
1da177e4 LT	643	.init_state = esp6_init_state,
1da177e4 LT	644	.destructor = esp6_destroy,
c5c25238	645	.get_mtu = esp6_get_mtu,
1da177e4	646	.input = esp6_input,
aee5adb4 MN	647	.output = esp6_output,
aee5adb4 MN	648	.hdr_offset = xfrm6_find_1stfragopt,
1da177e4 LT	649	};
1da177e4 LT	650
41135cc8	651	static const struct inet6_protocol esp6_protocol = {
1da177e4 LT	652	.handler = xfrm6_rcv,
	653	.err_handler = esp6_err,
	654	.flags = INET6_PROTO_NOPOLICY,
	655	};
	656
	657	static int __init esp6_init(void)
	658	{
	659	if (xfrm_register_type(&esp6_type, AF_INET6) < 0) {
f3213831	660	pr_info("%s: can't add xfrm type\n", __func__);
1da177e4 LT	661	return -EAGAIN;
	662	}
	663	if (inet6_add_protocol(&esp6_protocol, IPPROTO_ESP) < 0) {
f3213831	664	pr_info("%s: can't add protocol\n", __func__);
1da177e4 LT	665	xfrm_unregister_type(&esp6_type, AF_INET6);
	666	return -EAGAIN;
	667	}
	668
	669	return 0;
	670	}
	671
	672	static void __exit esp6_fini(void)
	673	{
	674	if (inet6_del_protocol(&esp6_protocol, IPPROTO_ESP) < 0)
f3213831	675	pr_info("%s: can't remove protocol\n", __func__);
1da177e4	676	if (xfrm_unregister_type(&esp6_type, AF_INET6) < 0)
f3213831	677	pr_info("%s: can't remove xfrm type\n", __func__);
1da177e4 LT	678	}
	679
	680	module_init(esp6_init);
	681	module_exit(esp6_fini);
	682
	683	MODULE_LICENSE("GPL");
d3d6dd3a	684	MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_ESP);