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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
Show stats Download patch file Download diff file Expand all files Collapse all files

1
include/linux/in.h
View file

@ -40,6 +40,7 @@ enum {
IPPROTO_ESP = 50, /* Encapsulation Security Payload protocol */
IPPROTO_AH = 51, /* Authentication Header protocol */
IPPROTO_BEETPH = 94, /* IP option pseudo header for BEET */
IPPROTO_PIM = 103, /* Protocol Independent Multicast */
IPPROTO_COMP = 108, /* Compression Header protocol */

9
include/linux/ip.h
View file

@ -80,6 +80,8 @@
#define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
#define IPOPT_TS_PRESPEC 3 /* specified modules only */
#define IPV4_BEET_PHMAXLEN 8
struct iphdr {
#if defined(__LITTLE_ENDIAN_BITFIELD)
__u8 ihl:4,
@ -123,4 +125,11 @@ struct ip_comp_hdr {
__be16 cpi;
};
struct ip_beet_phdr {
__u8 nexthdr;
__u8 hdrlen;
__u8 padlen;
__u8 reserved;
};
#endif /* _LINUX_IP_H */

3
include/linux/ipsec.h
View file

@ -12,7 +12,8 @@
enum {
IPSEC_MODE_ANY = 0, /* We do not support this for SA */
IPSEC_MODE_TRANSPORT = 1,
IPSEC_MODE_TUNNEL = 2
IPSEC_MODE_TUNNEL = 2,
IPSEC_MODE_BEET = 3
};
enum {

3
include/linux/xfrm.h
View file

@ -129,7 +129,8 @@ enum
#define XFRM_MODE_TUNNEL 1
#define XFRM_MODE_ROUTEOPTIMIZATION 2
#define XFRM_MODE_IN_TRIGGER 3
#define XFRM_MODE_MAX 4
#define XFRM_MODE_BEET 4
#define XFRM_MODE_MAX 5
/* Netlink configuration messages. */
enum {

9
net/ipv4/Kconfig
View file

@ -434,6 +434,15 @@ config INET_XFRM_MODE_TUNNEL
If unsure, say Y.
config INET_XFRM_MODE_BEET
tristate "IP: IPsec BEET mode"
default y
select XFRM
---help---
Support for IPsec BEET mode.
If unsure, say Y.
config INET_DIAG
tristate "INET: socket monitoring interface"
default y

1
net/ipv4/Makefile
View file

@ -23,6 +23,7 @@ obj-$(CONFIG_INET_AH) += ah4.o
obj-$(CONFIG_INET_ESP) += esp4.o
obj-$(CONFIG_INET_IPCOMP) += ipcomp.o
obj-$(CONFIG_INET_XFRM_TUNNEL) += xfrm4_tunnel.o
obj-$(CONFIG_INET_XFRM_MODE_BEET) += xfrm4_mode_beet.o
obj-$(CONFIG_INET_TUNNEL) += tunnel4.o
obj-$(CONFIG_INET_XFRM_MODE_TRANSPORT) += xfrm4_mode_transport.o
obj-$(CONFIG_INET_XFRM_MODE_TUNNEL) += xfrm4_mode_tunnel.o

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)

5
net/ipv4/ipcomp.c
View file

@ -206,6 +206,7 @@ static void ipcomp4_err(struct sk_buff *skb, u32 info)
static struct xfrm_state *ipcomp_tunnel_create(struct xfrm_state *x)
{
struct xfrm_state *t;
u8 mode = XFRM_MODE_TUNNEL;
t = xfrm_state_alloc();
if (t == NULL)
@ -216,7 +217,9 @@ static struct xfrm_state *ipcomp_tunnel_create(struct xfrm_state *x)
t->id.daddr.a4 = x->id.daddr.a4;
memcpy(&t->sel, &x->sel, sizeof(t->sel));
t->props.family = AF_INET;
t->props.mode = XFRM_MODE_TUNNEL;
if (x->props.mode == XFRM_MODE_BEET)
mode = x->props.mode;
t->props.mode = mode;
t->props.saddr.a4 = x->props.saddr.a4;
t->props.flags = x->props.flags;

139
net/ipv4/xfrm4_mode_beet.c Normal file
View file

@ -0,0 +1,139 @@
/*
* xfrm4_mode_beet.c - BEET mode encapsulation for IPv4.
*
* Copyright (c) 2006 Diego Beltrami <diego.beltrami@gmail.com>
* Miika Komu <miika@iki.fi>
* Herbert Xu <herbert@gondor.apana.org.au>
* Abhinav Pathak <abhinav.pathak@hiit.fi>
* Jeff Ahrenholz <ahrenholz@gmail.com>
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/stringify.h>
#include <net/dst.h>
#include <net/ip.h>
#include <net/xfrm.h>
/* Add encapsulation header.
*
* The top IP header will be constructed per draft-nikander-esp-beet-mode-06.txt.
* The following fields in it shall be filled in by x->type->output:
* tot_len
* check
*
* On exit, skb->h will be set to the start of the payload to be processed
* by x->type->output and skb->nh will be set to the top IP header.
*/
static int xfrm4_beet_output(struct xfrm_state *x, struct sk_buff *skb)
{
struct iphdr *iph, *top_iph = NULL;
int hdrlen, optlen;
iph = skb->nh.iph;
skb->h.ipiph = iph;
hdrlen = 0;
optlen = iph->ihl * 4 - sizeof(*iph);
if (unlikely(optlen))
hdrlen += IPV4_BEET_PHMAXLEN - (optlen & 4);
skb->nh.raw = skb_push(skb, x->props.header_len + hdrlen);
top_iph = skb->nh.iph;
hdrlen = iph->ihl * 4 - optlen;
skb->h.raw += hdrlen;
memmove(top_iph, iph, hdrlen);
if (unlikely(optlen)) {
struct ip_beet_phdr *ph;
BUG_ON(optlen < 0);
ph = (struct ip_beet_phdr *)skb->h.raw;
ph->padlen = 4 - (optlen & 4);
ph->hdrlen = (optlen + ph->padlen + sizeof(*ph)) / 8;
ph->nexthdr = top_iph->protocol;
top_iph->protocol = IPPROTO_BEETPH;
top_iph->ihl = sizeof(struct iphdr) / 4;
}
top_iph->saddr = x->props.saddr.a4;
top_iph->daddr = x->id.daddr.a4;
return 0;
}
static int xfrm4_beet_input(struct xfrm_state *x, struct sk_buff *skb)
{
struct iphdr *iph = skb->nh.iph;
int phlen = 0;
int optlen = 0;
__u8 ph_nexthdr = 0, protocol = 0;
int err = -EINVAL;
protocol = iph->protocol;
if (unlikely(iph->protocol == IPPROTO_BEETPH)) {
struct ip_beet_phdr *ph = (struct ip_beet_phdr*)(iph + 1);
if (!pskb_may_pull(skb, sizeof(*ph)))
goto out;
phlen = ph->hdrlen * 8;
optlen = phlen - ph->padlen - sizeof(*ph);
if (optlen < 0 || optlen & 3 || optlen > 250)
goto out;
if (!pskb_may_pull(skb, phlen))
goto out;
ph_nexthdr = ph->nexthdr;
}
skb_push(skb, sizeof(*iph) - phlen + optlen);
memmove(skb->data, skb->nh.raw, sizeof(*iph));
skb->nh.raw = skb->data;
iph = skb->nh.iph;
iph->ihl = (sizeof(*iph) + optlen) / 4;
iph->tot_len = htons(skb->len);
iph->daddr = x->sel.daddr.a4;
iph->saddr = x->sel.saddr.a4;
if (ph_nexthdr)
iph->protocol = ph_nexthdr;
else
iph->protocol = protocol;
iph->check = 0;
iph->check = ip_fast_csum(skb->nh.raw, iph->ihl);
err = 0;
out:
return err;
}
static struct xfrm_mode xfrm4_beet_mode = {
.input = xfrm4_beet_input,
.output = xfrm4_beet_output,
.owner = THIS_MODULE,
.encap = XFRM_MODE_BEET,
};
static int __init xfrm4_beet_init(void)
{
return xfrm_register_mode(&xfrm4_beet_mode, AF_INET);
}
static void __exit xfrm4_beet_exit(void)
{
int err;
err = xfrm_unregister_mode(&xfrm4_beet_mode, AF_INET);
BUG_ON(err);
}
module_init(xfrm4_beet_init);
module_exit(xfrm4_beet_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS_XFRM_MODE(AF_INET, XFRM_MODE_BEET);

10
net/ipv6/Kconfig
View file

@ -136,6 +136,16 @@ config INET6_XFRM_MODE_TUNNEL
If unsure, say Y.
config INET6_XFRM_MODE_BEET
tristate "IPv6: IPsec BEET mode"
depends on IPV6
default IPV6
select XFRM
---help---
Support for IPsec BEET mode.
If unsure, say Y.
config INET6_XFRM_MODE_ROUTEOPTIMIZATION
tristate "IPv6: MIPv6 route optimization mode (EXPERIMENTAL)"
depends on IPV6 && EXPERIMENTAL

1
net/ipv6/Makefile
View file

@ -26,6 +26,7 @@ obj-$(CONFIG_INET6_TUNNEL) += tunnel6.o
obj-$(CONFIG_INET6_XFRM_MODE_TRANSPORT) += xfrm6_mode_transport.o
obj-$(CONFIG_INET6_XFRM_MODE_TUNNEL) += xfrm6_mode_tunnel.o
obj-$(CONFIG_INET6_XFRM_MODE_ROUTEOPTIMIZATION) += xfrm6_mode_ro.o
obj-$(CONFIG_INET6_XFRM_MODE_BEET) += xfrm6_mode_beet.o
obj-$(CONFIG_NETFILTER) += netfilter/
obj-$(CONFIG_IPV6_TUNNEL) += ip6_tunnel.o

5
net/ipv6/ipcomp6.c
View file

@ -199,6 +199,7 @@ static void ipcomp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
static struct xfrm_state *ipcomp6_tunnel_create(struct xfrm_state *x)
{
struct xfrm_state *t = NULL;
u8 mode = XFRM_MODE_TUNNEL;
t = xfrm_state_alloc();
if (!t)
@ -212,7 +213,9 @@ static struct xfrm_state *ipcomp6_tunnel_create(struct xfrm_state *x)
memcpy(t->id.daddr.a6, x->id.daddr.a6, sizeof(struct in6_addr));
memcpy(&t->sel, &x->sel, sizeof(t->sel));
t->props.family = AF_INET6;
t->props.mode = XFRM_MODE_TUNNEL;
if (x->props.mode == XFRM_MODE_BEET)
mode = x->props.mode;
t->props.mode = mode;
memcpy(t->props.saddr.a6, x->props.saddr.a6, sizeof(struct in6_addr));
if (xfrm_init_state(t))

107
net/ipv6/xfrm6_mode_beet.c Normal file
View file

@ -0,0 +1,107 @@
/*
* xfrm6_mode_beet.c - BEET mode encapsulation for IPv6.
*
* Copyright (c) 2006 Diego Beltrami <diego.beltrami@gmail.com>
* Miika Komu <miika@iki.fi>
* Herbert Xu <herbert@gondor.apana.org.au>
* Abhinav Pathak <abhinav.pathak@hiit.fi>
* Jeff Ahrenholz <ahrenholz@gmail.com>
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/stringify.h>
#include <net/dsfield.h>
#include <net/dst.h>
#include <net/inet_ecn.h>
#include <net/ipv6.h>
#include <net/xfrm.h>
/* Add encapsulation header.
*
* The top IP header will be constructed per draft-nikander-esp-beet-mode-06.txt.
* The following fields in it shall be filled in by x->type->output:
* payload_len
*
* On exit, skb->h will be set to the start of the encapsulation header to be
* filled in by x->type->output and skb->nh will be set to the nextheader field
* of the extension header directly preceding the encapsulation header, or in
* its absence, that of the top IP header. The value of skb->data will always
* point to the top IP header.
*/
static int xfrm6_beet_output(struct xfrm_state *x, struct sk_buff *skb)
{
struct ipv6hdr *iph, *top_iph;
u8 *prevhdr;
int hdr_len;
skb_push(skb, x->props.header_len);
iph = skb->nh.ipv6h;
hdr_len = ip6_find_1stfragopt(skb, &prevhdr);
skb->nh.raw = prevhdr - x->props.header_len;
skb->h.raw = skb->data + hdr_len;
memmove(skb->data, iph, hdr_len);
skb->nh.raw = skb->data;
top_iph = skb->nh.ipv6h;
skb->nh.raw = &top_iph->nexthdr;
skb->h.ipv6h = top_iph + 1;
ipv6_addr_copy(&top_iph->saddr, (struct in6_addr *)&x->props.saddr);
ipv6_addr_copy(&top_iph->daddr, (struct in6_addr *)&x->id.daddr);
return 0;
}
static int xfrm6_beet_input(struct xfrm_state *x, struct sk_buff *skb)
{
struct ipv6hdr *ip6h;
int size = sizeof(struct ipv6hdr);
int err = -EINVAL;
if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
goto out;
skb_push(skb, size);
memmove(skb->data, skb->nh.raw, size);
skb->nh.raw = skb->data;
skb->mac.raw = memmove(skb->data - skb->mac_len,
skb->mac.raw, skb->mac_len);
ip6h = skb->nh.ipv6h;
ip6h->payload_len = htons(skb->len - size);
ipv6_addr_copy(&ip6h->daddr, (struct in6_addr *) &x->sel.daddr.a6);
ipv6_addr_copy(&ip6h->saddr, (struct in6_addr *) &x->sel.saddr.a6);
err = 0;
out:
return err;
}
static struct xfrm_mode xfrm6_beet_mode = {
.input = xfrm6_beet_input,
.output = xfrm6_beet_output,
.owner = THIS_MODULE,
.encap = XFRM_MODE_BEET,
};
static int __init xfrm6_beet_init(void)
{
return xfrm_register_mode(&xfrm6_beet_mode, AF_INET6);
}
static void __exit xfrm6_beet_exit(void)
{
int err;
err = xfrm_unregister_mode(&xfrm6_beet_mode, AF_INET6);
BUG_ON(err);
}
module_init(xfrm6_beet_init);
module_exit(xfrm6_beet_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS_XFRM_MODE(AF_INET6, XFRM_MODE_BEET);

1
net/xfrm/xfrm_user.c
View file

@ -211,6 +211,7 @@ static int verify_newsa_info(struct xfrm_usersa_info *p,
case XFRM_MODE_TRANSPORT:
case XFRM_MODE_TUNNEL:
case XFRM_MODE_ROUTEOPTIMIZATION:
case XFRM_MODE_BEET:
break;
default: