2005-04-16 22:20:36 +00:00
|
|
|
/*
|
|
|
|
* Copyright (C)2002 USAGI/WIDE Project
|
2007-02-09 14:24:49 +00:00
|
|
|
*
|
2005-04-16 22:20:36 +00:00
|
|
|
* 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.
|
2007-02-09 14:24:49 +00:00
|
|
|
*
|
2005-04-16 22:20:36 +00:00
|
|
|
* 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.
|
2007-02-09 14:24:49 +00:00
|
|
|
*
|
2005-04-16 22:20:36 +00:00
|
|
|
* 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
|
|
|
|
*
|
2007-02-09 14:24:49 +00:00
|
|
|
* Mitsuru KANDA @USAGI : IPv6 Support
|
2005-04-16 22:20:36 +00:00
|
|
|
* Kazunori MIYAZAWA @USAGI :
|
|
|
|
* Kunihiro Ishiguro <kunihiro@ipinfusion.com>
|
2007-02-09 14:24:49 +00:00
|
|
|
*
|
2005-04-16 22:20:36 +00:00
|
|
|
* This file is derived from net/ipv4/esp.c
|
|
|
|
*/
|
|
|
|
|
2008-01-29 03:35:05 +00:00
|
|
|
#include <crypto/aead.h>
|
|
|
|
#include <crypto/authenc.h>
|
2006-07-30 05:41:01 +00:00
|
|
|
#include <linux/err.h>
|
2005-04-16 22:20:36 +00:00
|
|
|
#include <linux/module.h>
|
|
|
|
#include <net/ip.h>
|
|
|
|
#include <net/xfrm.h>
|
|
|
|
#include <net/esp.h>
|
2007-10-27 05:53:58 +00:00
|
|
|
#include <linux/scatterlist.h>
|
2005-10-11 04:11:08 +00:00
|
|
|
#include <linux/kernel.h>
|
2005-04-16 22:20:36 +00:00
|
|
|
#include <linux/pfkeyv2.h>
|
|
|
|
#include <linux/random.h>
|
2008-01-29 03:35:05 +00:00
|
|
|
#include <linux/slab.h>
|
2007-10-09 20:33:35 +00:00
|
|
|
#include <linux/spinlock.h>
|
2005-04-16 22:20:36 +00:00
|
|
|
#include <net/icmp.h>
|
|
|
|
#include <net/ipv6.h>
|
2005-12-27 04:43:12 +00:00
|
|
|
#include <net/protocol.h>
|
2005-04-16 22:20:36 +00:00
|
|
|
#include <linux/icmpv6.h>
|
|
|
|
|
2008-01-29 03:35:05 +00:00
|
|
|
struct esp_skb_cb {
|
|
|
|
struct xfrm_skb_cb xfrm;
|
|
|
|
void *tmp;
|
|
|
|
};
|
|
|
|
|
|
|
|
#define ESP_SKB_CB(__skb) ((struct esp_skb_cb *)&((__skb)->cb[0]))
|
|
|
|
|
2010-12-08 04:37:51 +00:00
|
|
|
static u32 esp6_get_mtu(struct xfrm_state *x, int mtu);
|
|
|
|
|
2008-01-29 03:35:05 +00:00
|
|
|
/*
|
|
|
|
* Allocate an AEAD request structure with extra space for SG and IV.
|
|
|
|
*
|
|
|
|
* For alignment considerations the IV is placed at the front, followed
|
|
|
|
* by 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)
|
|
|
|
{
|
|
|
|
unsigned int len;
|
|
|
|
|
|
|
|
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 u8 *esp_tmp_iv(struct crypto_aead *aead, void *tmp)
|
|
|
|
{
|
|
|
|
return crypto_aead_ivsize(aead) ?
|
|
|
|
PTR_ALIGN((u8 *)tmp, crypto_aead_alignmask(aead) + 1) : tmp;
|
|
|
|
}
|
|
|
|
|
|
|
|
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);
|
|
|
|
}
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
|
|
|
|
{
|
|
|
|
int err;
|
2007-10-10 22:45:25 +00:00
|
|
|
struct ip_esp_hdr *esph;
|
2008-01-29 03:35:05 +00:00
|
|
|
struct crypto_aead *aead;
|
|
|
|
struct aead_givcrypt_request *req;
|
|
|
|
struct scatterlist *sg;
|
|
|
|
struct scatterlist *asg;
|
2005-04-16 22:20:36 +00:00
|
|
|
struct sk_buff *trailer;
|
2008-01-29 03:35:05 +00:00
|
|
|
void *tmp;
|
2005-04-16 22:20:36 +00:00
|
|
|
int blksize;
|
|
|
|
int clen;
|
|
|
|
int alen;
|
2010-12-08 04:37:51 +00:00
|
|
|
int plen;
|
|
|
|
int tfclen;
|
2005-04-16 22:20:36 +00:00
|
|
|
int nfrags;
|
2008-01-29 03:35:05 +00:00
|
|
|
u8 *iv;
|
2007-04-20 03:29:13 +00:00
|
|
|
u8 *tail;
|
2007-04-26 00:55:53 +00:00
|
|
|
struct esp_data *esp = x->data;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2007-10-10 22:44:06 +00:00
|
|
|
/* skb is pure payload to encrypt */
|
2005-04-16 22:20:36 +00:00
|
|
|
err = -ENOMEM;
|
|
|
|
|
2008-01-29 03:35:05 +00:00
|
|
|
aead = esp->aead;
|
|
|
|
alen = crypto_aead_authsize(aead);
|
|
|
|
|
2010-12-08 04:37:51 +00:00
|
|
|
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;
|
|
|
|
}
|
2008-01-29 03:35:05 +00:00
|
|
|
blksize = ALIGN(crypto_aead_blocksize(aead), 4);
|
2010-12-08 04:37:51 +00:00
|
|
|
clen = ALIGN(skb->len + 2 + tfclen, blksize);
|
2008-01-29 03:35:05 +00:00
|
|
|
if (esp->padlen)
|
|
|
|
clen = ALIGN(clen, esp->padlen);
|
2010-12-08 04:37:51 +00:00
|
|
|
plen = clen - skb->len - tfclen;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2010-12-08 04:37:51 +00:00
|
|
|
err = skb_cow_data(skb, tfclen + plen + alen, &trailer);
|
|
|
|
if (err < 0)
|
2005-04-16 22:20:36 +00:00
|
|
|
goto error;
|
2008-01-29 03:35:05 +00:00
|
|
|
nfrags = err;
|
|
|
|
|
|
|
|
tmp = esp_alloc_tmp(aead, nfrags + 1);
|
|
|
|
if (!tmp)
|
|
|
|
goto error;
|
|
|
|
|
|
|
|
iv = esp_tmp_iv(aead, tmp);
|
|
|
|
req = esp_tmp_givreq(aead, iv);
|
|
|
|
asg = esp_givreq_sg(aead, req);
|
|
|
|
sg = asg + 1;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
/* Fill padding... */
|
2007-04-20 03:29:13 +00:00
|
|
|
tail = skb_tail_pointer(trailer);
|
2010-12-08 04:37:51 +00:00
|
|
|
if (tfclen) {
|
|
|
|
memset(tail, 0, tfclen);
|
|
|
|
tail += tfclen;
|
|
|
|
}
|
2005-04-16 22:20:36 +00:00
|
|
|
do {
|
|
|
|
int i;
|
2010-12-08 04:37:51 +00:00
|
|
|
for (i = 0; i < plen - 2; i++)
|
2007-04-20 03:29:13 +00:00
|
|
|
tail[i] = i + 1;
|
2005-04-16 22:20:36 +00:00
|
|
|
} while (0);
|
2010-12-08 04:37:51 +00:00
|
|
|
tail[plen - 2] = plen - 2;
|
|
|
|
tail[plen - 1] = *skb_mac_header(skb);
|
2008-01-29 03:35:05 +00:00
|
|
|
pskb_put(skb, trailer, clen - skb->len + alen);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2007-10-10 22:44:06 +00:00
|
|
|
skb_push(skb, -skb_network_offset(skb));
|
2007-10-10 22:45:25 +00:00
|
|
|
esph = ip_esp_hdr(skb);
|
2007-10-09 20:25:59 +00:00
|
|
|
*skb_mac_header(skb) = IPPROTO_ESP;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
esph->spi = x->id.spi;
|
2008-02-13 06:50:35 +00:00
|
|
|
esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2008-01-29 03:35:05 +00:00
|
|
|
sg_init_table(sg, nfrags);
|
|
|
|
skb_to_sgvec(skb, sg,
|
|
|
|
esph->enc_data + crypto_aead_ivsize(aead) - skb->data,
|
|
|
|
clen + alen);
|
|
|
|
sg_init_one(asg, esph, sizeof(*esph));
|
2007-10-09 20:33:35 +00:00
|
|
|
|
2008-01-29 03:35:05 +00:00
|
|
|
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, sizeof(*esph));
|
2008-02-13 06:50:35 +00:00
|
|
|
aead_givcrypt_set_giv(req, esph->enc_data,
|
|
|
|
XFRM_SKB_CB(skb)->seq.output);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2008-01-29 03:35:05 +00:00
|
|
|
ESP_SKB_CB(skb)->tmp = tmp;
|
|
|
|
err = crypto_aead_givencrypt(req);
|
|
|
|
if (err == -EINPROGRESS)
|
|
|
|
goto error;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2008-01-29 03:35:05 +00:00
|
|
|
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);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2006-07-30 05:41:01 +00:00
|
|
|
if (unlikely(err))
|
2008-01-29 03:35:05 +00:00
|
|
|
goto out;
|
2006-07-30 05:41:01 +00:00
|
|
|
|
2008-01-29 03:35:05 +00:00
|
|
|
if (skb_copy_bits(skb, skb->len - alen - 2, nexthdr, 2))
|
|
|
|
BUG();
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2008-01-29 03:35:05 +00:00
|
|
|
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;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
2008-01-29 03:35:05 +00:00
|
|
|
/* ... check padding bits here. Silly. :-) */
|
2007-10-09 20:33:35 +00:00
|
|
|
|
2008-01-29 03:35:05 +00:00
|
|
|
pskb_trim(skb, skb->len - alen - padlen - 2);
|
|
|
|
__skb_pull(skb, hlen);
|
|
|
|
skb_set_transport_header(skb, -hdr_len);
|
|
|
|
|
|
|
|
err = nexthdr[1];
|
|
|
|
|
|
|
|
/* RFC4303: Drop dummy packets without any error */
|
|
|
|
if (err == IPPROTO_NONE)
|
|
|
|
err = -EINVAL;
|
|
|
|
|
|
|
|
out:
|
2005-04-16 22:20:36 +00:00
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
2008-01-29 03:35:05 +00:00
|
|
|
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));
|
|
|
|
}
|
|
|
|
|
2006-04-01 08:52:46 +00:00
|
|
|
static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2007-10-10 22:45:25 +00:00
|
|
|
struct ip_esp_hdr *esph;
|
2005-04-16 22:20:36 +00:00
|
|
|
struct esp_data *esp = x->data;
|
2008-01-29 03:35:05 +00:00
|
|
|
struct crypto_aead *aead = esp->aead;
|
|
|
|
struct aead_request *req;
|
2005-04-16 22:20:36 +00:00
|
|
|
struct sk_buff *trailer;
|
2008-01-29 03:35:05 +00:00
|
|
|
int elen = skb->len - sizeof(*esph) - crypto_aead_ivsize(aead);
|
2005-04-16 22:20:36 +00:00
|
|
|
int nfrags;
|
|
|
|
int ret = 0;
|
2008-01-29 03:35:05 +00:00
|
|
|
void *tmp;
|
|
|
|
u8 *iv;
|
|
|
|
struct scatterlist *sg;
|
|
|
|
struct scatterlist *asg;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2008-03-27 23:08:03 +00:00
|
|
|
if (!pskb_may_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead))) {
|
2005-04-16 22:20:36 +00:00
|
|
|
ret = -EINVAL;
|
2006-05-28 06:06:13 +00:00
|
|
|
goto out;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
2008-01-29 03:35:05 +00:00
|
|
|
if (elen <= 0) {
|
2005-04-16 22:20:36 +00:00
|
|
|
ret = -EINVAL;
|
2006-05-28 06:06:13 +00:00
|
|
|
goto out;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
2007-11-14 05:45:58 +00:00
|
|
|
if ((nfrags = skb_cow_data(skb, 0, &trailer)) < 0) {
|
|
|
|
ret = -EINVAL;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
2008-01-29 03:35:05 +00:00
|
|
|
ret = -ENOMEM;
|
|
|
|
tmp = esp_alloc_tmp(aead, nfrags + 1);
|
|
|
|
if (!tmp)
|
|
|
|
goto out;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2008-01-29 03:35:05 +00:00
|
|
|
ESP_SKB_CB(skb)->tmp = tmp;
|
|
|
|
iv = esp_tmp_iv(aead, tmp);
|
|
|
|
req = esp_tmp_req(aead, iv);
|
|
|
|
asg = esp_req_sg(aead, req);
|
|
|
|
sg = asg + 1;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2008-01-29 03:35:05 +00:00
|
|
|
skb->ip_summed = CHECKSUM_NONE;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2007-10-10 22:45:25 +00:00
|
|
|
esph = (struct ip_esp_hdr *)skb->data;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
/* Get ivec. This can be wrong, check against another impls. */
|
2008-01-29 03:35:05 +00:00
|
|
|
iv = esph->enc_data;
|
2007-11-14 05:45:58 +00:00
|
|
|
|
2008-01-29 03:35:05 +00:00
|
|
|
sg_init_table(sg, nfrags);
|
|
|
|
skb_to_sgvec(skb, sg, sizeof(*esph) + crypto_aead_ivsize(aead), elen);
|
|
|
|
sg_init_one(asg, esph, sizeof(*esph));
|
2007-11-14 05:45:58 +00:00
|
|
|
|
2008-01-29 03:35:05 +00:00
|
|
|
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, sizeof(*esph));
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2008-01-29 03:35:05 +00:00
|
|
|
ret = crypto_aead_decrypt(req);
|
|
|
|
if (ret == -EINPROGRESS)
|
|
|
|
goto out;
|
2007-12-11 00:53:29 +00:00
|
|
|
|
2008-01-29 03:35:05 +00:00
|
|
|
ret = esp_input_done2(skb, ret);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
out:
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2007-04-09 18:47:18 +00:00
|
|
|
static u32 esp6_get_mtu(struct xfrm_state *x, int mtu)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
struct esp_data *esp = x->data;
|
2008-01-29 03:35:05 +00:00
|
|
|
u32 blksize = ALIGN(crypto_aead_blocksize(esp->aead), 4);
|
|
|
|
u32 align = max_t(u32, blksize, esp->padlen);
|
2007-04-09 18:47:18 +00:00
|
|
|
u32 rem;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2008-01-29 03:35:05 +00:00
|
|
|
mtu -= x->props.header_len + crypto_aead_authsize(esp->aead);
|
2007-04-09 18:47:18 +00:00
|
|
|
rem = mtu & (align - 1);
|
|
|
|
mtu &= ~(align - 1);
|
|
|
|
|
|
|
|
if (x->props.mode != XFRM_MODE_TUNNEL) {
|
2005-10-11 04:11:34 +00:00
|
|
|
u32 padsize = ((blksize - 1) & 7) + 1;
|
2007-04-09 18:47:18 +00:00
|
|
|
mtu -= blksize - padsize;
|
|
|
|
mtu += min_t(u32, blksize - padsize, rem);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
2007-04-09 18:47:18 +00:00
|
|
|
return mtu - 2;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static void esp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
|
2009-06-23 11:31:07 +00:00
|
|
|
u8 type, u8 code, int offset, __be32 info)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2008-11-26 01:59:27 +00:00
|
|
|
struct net *net = dev_net(skb->dev);
|
2005-04-16 22:20:36 +00:00
|
|
|
struct ipv6hdr *iph = (struct ipv6hdr*)skb->data;
|
2007-10-10 22:45:25 +00:00
|
|
|
struct ip_esp_hdr *esph = (struct ip_esp_hdr *)(skb->data + offset);
|
2005-04-16 22:20:36 +00:00
|
|
|
struct xfrm_state *x;
|
|
|
|
|
2007-02-09 14:24:49 +00:00
|
|
|
if (type != ICMPV6_DEST_UNREACH &&
|
2005-04-16 22:20:36 +00:00
|
|
|
type != ICMPV6_PKT_TOOBIG)
|
|
|
|
return;
|
|
|
|
|
2010-02-23 00:20:22 +00:00
|
|
|
x = xfrm_state_lookup(net, skb->mark, (xfrm_address_t *)&iph->daddr, esph->spi, IPPROTO_ESP, AF_INET6);
|
2005-04-16 22:20:36 +00:00
|
|
|
if (!x)
|
|
|
|
return;
|
2008-10-29 19:52:50 +00:00
|
|
|
printk(KERN_DEBUG "pmtu discovery on SA ESP/%08x/%pI6\n",
|
2008-10-28 23:09:23 +00:00
|
|
|
ntohl(esph->spi), &iph->daddr);
|
2005-04-16 22:20:36 +00:00
|
|
|
xfrm_state_put(x);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void esp6_destroy(struct xfrm_state *x)
|
|
|
|
{
|
|
|
|
struct esp_data *esp = x->data;
|
|
|
|
|
|
|
|
if (!esp)
|
|
|
|
return;
|
|
|
|
|
2008-01-29 03:35:05 +00:00
|
|
|
crypto_free_aead(esp->aead);
|
2005-04-16 22:20:36 +00:00
|
|
|
kfree(esp);
|
|
|
|
}
|
|
|
|
|
2008-01-29 03:37:29 +00:00
|
|
|
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)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2008-01-29 03:37:29 +00:00
|
|
|
struct esp_data *esp = x->data;
|
2008-01-29 03:35:05 +00:00
|
|
|
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;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2008-01-29 03:37:29 +00:00
|
|
|
err = -EINVAL;
|
2005-04-16 22:20:36 +00:00
|
|
|
if (x->ealg == NULL)
|
2008-01-29 03:37:29 +00:00
|
|
|
goto error;
|
2008-01-29 03:35:05 +00:00
|
|
|
|
2008-01-29 03:37:29 +00:00
|
|
|
err = -ENAMETOOLONG;
|
2008-01-29 03:35:05 +00:00
|
|
|
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)
|
2008-01-29 03:37:29 +00:00
|
|
|
goto error;
|
2008-01-29 03:35:05 +00:00
|
|
|
|
|
|
|
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));
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
if (x->aalg) {
|
|
|
|
struct xfrm_algo_desc *aalg_desc;
|
|
|
|
|
2008-01-29 03:35:05 +00:00
|
|
|
memcpy(p, x->aalg->alg_key, (x->aalg->alg_key_len + 7) / 8);
|
|
|
|
p += (x->aalg->alg_key_len + 7) / 8;
|
2007-02-09 14:24:49 +00:00
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
|
|
|
|
BUG_ON(!aalg_desc);
|
2007-02-09 14:24:49 +00:00
|
|
|
|
2008-01-29 03:35:05 +00:00
|
|
|
err = -EINVAL;
|
2005-04-16 22:20:36 +00:00
|
|
|
if (aalg_desc->uinfo.auth.icv_fullbits/8 !=
|
2008-01-29 03:35:05 +00:00
|
|
|
crypto_aead_authsize(aead)) {
|
2006-08-20 04:24:50 +00:00
|
|
|
NETDEBUG(KERN_INFO "ESP: %s digestsize %u != %hu\n",
|
|
|
|
x->aalg->alg_name,
|
2008-01-29 03:35:05 +00:00
|
|
|
crypto_aead_authsize(aead),
|
2006-08-20 04:24:50 +00:00
|
|
|
aalg_desc->uinfo.auth.icv_fullbits/8);
|
2008-01-29 03:35:05 +00:00
|
|
|
goto free_key;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
2007-02-09 14:24:49 +00:00
|
|
|
|
2008-01-29 03:35:05 +00:00
|
|
|
err = crypto_aead_setauthsize(
|
2009-11-25 00:29:53 +00:00
|
|
|
aead, x->aalg->alg_trunc_len / 8);
|
2008-01-29 03:35:05 +00:00
|
|
|
if (err)
|
|
|
|
goto free_key;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
2008-01-29 03:35:05 +00:00
|
|
|
|
|
|
|
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);
|
|
|
|
|
2008-01-29 03:37:29 +00:00
|
|
|
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);
|
|
|
|
|
2008-01-29 03:35:05 +00:00
|
|
|
if (err)
|
2005-04-16 22:20:36 +00:00
|
|
|
goto error;
|
2008-01-29 03:35:05 +00:00
|
|
|
|
2008-01-29 03:37:29 +00:00
|
|
|
aead = esp->aead;
|
|
|
|
|
|
|
|
esp->padlen = 0;
|
|
|
|
|
2008-01-29 03:35:05 +00:00
|
|
|
x->props.header_len = sizeof(struct ip_esp_hdr) +
|
|
|
|
crypto_aead_ivsize(aead);
|
2007-10-18 04:35:15 +00:00
|
|
|
switch (x->props.mode) {
|
|
|
|
case XFRM_MODE_BEET:
|
2008-08-06 09:40:25 +00:00
|
|
|
if (x->sel.family != AF_INET6)
|
|
|
|
x->props.header_len += IPV4_BEET_PHMAXLEN +
|
|
|
|
(sizeof(struct ipv6hdr) - sizeof(struct iphdr));
|
|
|
|
break;
|
2007-10-18 04:35:15 +00:00
|
|
|
case XFRM_MODE_TRANSPORT:
|
|
|
|
break;
|
|
|
|
case XFRM_MODE_TUNNEL:
|
2005-04-16 22:20:36 +00:00
|
|
|
x->props.header_len += sizeof(struct ipv6hdr);
|
2007-10-22 09:30:15 +00:00
|
|
|
break;
|
2007-10-18 04:35:15 +00:00
|
|
|
default:
|
|
|
|
goto error;
|
|
|
|
}
|
2008-01-29 03:35:05 +00:00
|
|
|
|
|
|
|
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);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
error:
|
2008-01-29 03:35:05 +00:00
|
|
|
return err;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
2008-01-31 03:11:50 +00:00
|
|
|
static const struct xfrm_type esp6_type =
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
.description = "ESP6",
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.proto = IPPROTO_ESP,
|
2007-10-09 00:25:53 +00:00
|
|
|
.flags = XFRM_TYPE_REPLAY_PROT,
|
2005-04-16 22:20:36 +00:00
|
|
|
.init_state = esp6_init_state,
|
|
|
|
.destructor = esp6_destroy,
|
2007-04-09 18:47:18 +00:00
|
|
|
.get_mtu = esp6_get_mtu,
|
2005-04-16 22:20:36 +00:00
|
|
|
.input = esp6_input,
|
2006-08-24 00:57:28 +00:00
|
|
|
.output = esp6_output,
|
|
|
|
.hdr_offset = xfrm6_find_1stfragopt,
|
2005-04-16 22:20:36 +00:00
|
|
|
};
|
|
|
|
|
2009-09-14 12:22:28 +00:00
|
|
|
static const struct inet6_protocol esp6_protocol = {
|
2005-04-16 22:20:36 +00:00
|
|
|
.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) {
|
|
|
|
printk(KERN_INFO "ipv6 esp init: can't add xfrm type\n");
|
|
|
|
return -EAGAIN;
|
|
|
|
}
|
|
|
|
if (inet6_add_protocol(&esp6_protocol, IPPROTO_ESP) < 0) {
|
|
|
|
printk(KERN_INFO "ipv6 esp init: can't add protocol\n");
|
|
|
|
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)
|
|
|
|
printk(KERN_INFO "ipv6 esp close: can't remove protocol\n");
|
|
|
|
if (xfrm_unregister_type(&esp6_type, AF_INET6) < 0)
|
|
|
|
printk(KERN_INFO "ipv6 esp close: can't remove xfrm type\n");
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(esp6_init);
|
|
|
|
module_exit(esp6_fini);
|
|
|
|
|
|
|
|
MODULE_LICENSE("GPL");
|
2007-06-27 06:57:49 +00:00
|
|
|
MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_ESP);
|