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authorHerbert Xu <herbert@gondor.apana.org.au>2007-12-12 10:44:43 -0800
committerDavid S. Miller <davem@davemloft.net>2008-01-28 14:57:23 -0800
commit8b7817f3a959ed99d7443afc12f78a7e1fcc2063 (patch)
tree7e315dfbf5c77e67f6e7ad56f14eaddca621212b /net/xfrm
parentd5422efe680fc55010c6ddca2370ca9548a96355 (diff)
[IPSEC]: Add ICMP host relookup support
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>
Diffstat (limited to 'net/xfrm')
-rw-r--r--net/xfrm/xfrm_policy.c17
1 files changed, 14 insertions, 3 deletions
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 2e10d46c0e8..a83b5e1349e 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -1469,11 +1469,13 @@ restart:
goto dropdst;
}
+ err = -ENOENT;
+
if (!policy) {
/* To accelerate a bit... */
if ((dst_orig->flags & DST_NOXFRM) ||
!xfrm_policy_count[XFRM_POLICY_OUT])
- return 0;
+ goto nopol;
policy = flow_cache_lookup(fl, dst_orig->ops->family,
dir, xfrm_policy_lookup);
@@ -1483,14 +1485,18 @@ restart:
}
if (!policy)
- return 0;
+ goto nopol;
family = dst_orig->ops->family;
- policy->curlft.use_time = get_seconds();
pols[0] = policy;
npols ++;
xfrm_nr += pols[0]->xfrm_nr;
+ if ((flags & XFRM_LOOKUP_ICMP) && !(policy->flags & XFRM_POLICY_ICMP))
+ goto error;
+
+ policy->curlft.use_time = get_seconds();
+
switch (policy->action) {
default:
case XFRM_POLICY_BLOCK:
@@ -1649,6 +1655,11 @@ dropdst:
dst_release(dst_orig);
*dst_p = NULL;
return err;
+
+nopol:
+ if (flags & XFRM_LOOKUP_ICMP)
+ goto dropdst;
+ return 0;
}
EXPORT_SYMBOL(__xfrm_lookup);