diff options
| author | Herbert Xu <herbert@gondor.apana.org.au> | 2007-12-12 19:44:16 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-01-28 23:57:22 +0100 |
| commit | d5422efe680fc55010c6ddca2370ca9548a96355 (patch) | |
| tree | f72fa5eb779c8ae7d49688a9caac9b69a1f3bd58 /net/ipv4/xfrm4_policy.c | |
| parent | [IPSEC]: Make xfrm_lookup flags argument a bit-field (diff) | |
| download | linux-d5422efe680fc55010c6ddca2370ca9548a96355.tar.xz linux-d5422efe680fc55010c6ddca2370ca9548a96355.zip | |
[IPSEC]: Added xfrm_decode_session_reverse and xfrmX_policy_check_reverse
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>
Diffstat (limited to 'net/ipv4/xfrm4_policy.c')
| -rw-r--r-- | net/ipv4/xfrm4_policy.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/net/ipv4/xfrm4_policy.c b/net/ipv4/xfrm4_policy.c index 10b72d185bb9..5ccae3a463c2 100644 --- a/net/ipv4/xfrm4_policy.c +++ b/net/ipv4/xfrm4_policy.c @@ -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; } |