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[IPSEC]: Added xfrm_decode_session_reverse and xfrmX_policy_check_reverse

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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 adds the functions
xfrm_decode_session_reverse and xfrmX_policy_check_reverse so we can get
the reverse flow to perform such a lookup.

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 10:44:16 -08:00
committed by David S. Miller
parent 815f4e57e9
commit d5422efe68
5 changed files with 80 additions and 21 deletions
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17
net/xfrm/xfrm_policy.c
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@ -1732,8 +1732,8 @@ xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start,
return start;
}
int
xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family)
int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
unsigned int family, int reverse)
{
struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
int err;
@ -1741,12 +1741,12 @@ xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family
if (unlikely(afinfo == NULL))
return -EAFNOSUPPORT;
afinfo->decode_session(skb, fl);
afinfo->decode_session(skb, fl, reverse);
err = security_xfrm_decode_session(skb, &fl->secid);
xfrm_policy_put_afinfo(afinfo);
return err;
}
EXPORT_SYMBOL(xfrm_decode_session);
EXPORT_SYMBOL(__xfrm_decode_session);
static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp)
{
@ -1768,11 +1768,16 @@ int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
int npols = 0;
int xfrm_nr;
int pi;
int reverse;
struct flowi fl;
u8 fl_dir = policy_to_flow_dir(dir);
u8 fl_dir;
int xerr_idx = -1;
if (xfrm_decode_session(skb, &fl, family) < 0)
reverse = dir & ~XFRM_POLICY_MASK;
dir &= XFRM_POLICY_MASK;
fl_dir = policy_to_flow_dir(dir);
if (__xfrm_decode_session(skb, &fl, family, reverse) < 0)
return 0;
nf_nat_decode_session(skb, &fl, family);