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[IPSEC]: Add ICMP host relookup support

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RFC 4301 requires us to relookup ICMP traffic that does not match any
policies using the reverse of its payload.  This patch implements this
for ICMP traffic that originates from or terminates on localhost.

This is activated on outbound with the new policy flag XFRM_POLICY_ICMP,
and on inbound by the new state flag XFRM_STATE_ICMP.

On inbound the policy check is now performed by the ICMP protocol so
that it can repeat the policy check where necessary.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu
2007-12-12 10:44:43 -08:00
committed by David S. Miller
parent d5422efe68
commit 8b7817f3a9
6 changed files with 154 additions and 10 deletions
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3
include/linux/xfrm.h
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@@ -329,6 +329,7 @@ struct xfrm_usersa_info {
#define XFRM_STATE_DECAP_DSCP 2
#define XFRM_STATE_NOPMTUDISC 4
#define XFRM_STATE_WILDRECV 8
#define XFRM_STATE_ICMP 16
};
struct xfrm_usersa_id {
@@ -363,6 +364,8 @@ struct xfrm_userpolicy_info {
#define XFRM_POLICY_BLOCK 1
__u8 flags;
#define XFRM_POLICY_LOCALOK 1 /* Allow user to override global policy */
/* Automatically expand selector to include matching ICMP payloads. */
#define XFRM_POLICY_ICMP 2
__u8 share;
};