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[XFRM]: BEET mode

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This patch introduces the BEET mode (Bound End-to-End Tunnel) with as
specified by the ietf draft at the following link:

http://www.ietf.org/internet-drafts/draft-nikander-esp-beet-mode-06.txt

The patch provides only single family support (i.e. inner family =
outer family).

Signed-off-by: Diego Beltrami <diego.beltrami@gmail.com>
Signed-off-by: Miika Komu     <miika@iki.fi>
Signed-off-by: Herbert Xu     <herbert@gondor.apana.org.au>
Signed-off-by: Abhinav Pathak <abhinav.pathak@hiit.fi>
Signed-off-by: Jeff Ahrenholz <ahrenholz@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Diego Beltrami 2006-10-03 23:47:05 -07:00 • committed by David S. Miller
parent 80246ab36e
commit 0a69452cb4
14 changed files with 308 additions and 10 deletions
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24
net/ipv4/esp4.c
View file

@ -253,7 +253,8 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
* as per draft-ietf-ipsec-udp-encaps-06,
* section 3.1.2
*/
if (x->props.mode == XFRM_MODE_TRANSPORT)
if (x->props.mode == XFRM_MODE_TRANSPORT ||
x->props.mode == XFRM_MODE_BEET)
skb->ip_summed = CHECKSUM_UNNECESSARY;
}
@ -271,17 +272,28 @@ static u32 esp4_get_max_size(struct xfrm_state *x, int mtu)
{
struct esp_data *esp = x->data;
u32 blksize = ALIGN(crypto_blkcipher_blocksize(esp->conf.tfm), 4);
int enclen = 0;
if (x->props.mode == XFRM_MODE_TUNNEL) {
mtu = ALIGN(mtu + 2, blksize);
} else {
/* The worst case. */
switch (x->props.mode) {
case XFRM_MODE_TUNNEL:
mtu = ALIGN(mtu +2, blksize);
break;
default:
case XFRM_MODE_TRANSPORT:
/* The worst case */
mtu = ALIGN(mtu + 2, 4) + blksize - 4;
break;
case XFRM_MODE_BEET:
/* The worst case. */
enclen = IPV4_BEET_PHMAXLEN;
mtu = ALIGN(mtu + enclen + 2, blksize);
break;
}
if (esp->conf.padlen)
mtu = ALIGN(mtu, esp->conf.padlen);
return mtu + x->props.header_len + esp->auth.icv_trunc_len;
return mtu + x->props.header_len + esp->auth.icv_trunc_len - enclen;
}
static void esp4_err(struct sk_buff *skb, u32 info)