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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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10
net/ipv4/xfrm4_policy.c
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@@ -115,7 +115,7 @@ static int xfrm4_fill_dst(struct xfrm_dst *xdst, struct net_device *dev)
}
static void
_decode_session4(struct sk_buff *skb, struct flowi *fl)
_decode_session4(struct sk_buff *skb, struct flowi *fl, int reverse)
{
struct iphdr *iph = ip_hdr(skb);
u8 *xprth = skb_network_header(skb) + iph->ihl * 4;
@@ -131,8 +131,8 @@ _decode_session4(struct sk_buff *skb, struct flowi *fl)
if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
__be16 *ports = (__be16 *)xprth;
fl->fl_ip_sport = ports[0];
fl->fl_ip_dport = ports[1];
fl->fl_ip_sport = ports[!!reverse];
fl->fl_ip_dport = ports[!reverse];
}
break;
@@ -174,8 +174,8 @@ _decode_session4(struct sk_buff *skb, struct flowi *fl)
}
}
fl->proto = iph->protocol;
fl->fl4_dst = iph->daddr;
fl->fl4_src = iph->saddr;
fl->fl4_dst = reverse ? iph->saddr : iph->daddr;
fl->fl4_src = reverse ? iph->daddr : iph->saddr;
fl->fl4_tos = iph->tos;
}