[IPV4/6]: Netfilter IPsec input hooks

When the innermost transform uses transport mode the decapsulated packet
is not visible to netfilter. Pass the packet through the PRE_ROUTING and
LOCAL_IN hooks again before handing it to upper layer protocols to make
netfilter-visibility symetrical to the output path.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 13 insertions, 0 deletions

diff --git a/net/ipv6/xfrm6_input.c b/net/ipv6/xfrm6_input.c
index 1079e47f3933..1ca2da68ef69 100644
--- a/net/ipv6/xfrm6_input.c
+++ b/net/ipv6/xfrm6_input.c
@@ -11,6 +11,8 @@
 
 #include <linux/module.h>
 #include <linux/string.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv6.h>
 #include <net/dsfield.h>
 #include <net/inet_ecn.h>
 #include <net/ip.h>
@@ -121,6 +123,8 @@ int xfrm6_rcv_spi(struct sk_buff **pskb, u32 spi)
         skb->sp->len += xfrm_nr;
         skb->ip_summed = CHECKSUM_NONE;
 
+        nf_reset(skb);
+
         if (decaps) {
                 if (!(skb->dev->flags&IFF_LOOPBACK)) {
                         dst_release(skb->dst);
@@ -129,7 +133,16 @@ int xfrm6_rcv_spi(struct sk_buff **pskb, u32 spi)
                 netif_rx(skb);
                 return -1;
         } else {
+#ifdef CONFIG_NETFILTER
+                skb->nh.ipv6h->payload_len = htons(skb->len);
+                __skb_push(skb, skb->data - skb->nh.raw);
+
+                NF_HOOK(PF_INET6, NF_IP6_PRE_ROUTING, skb, skb->dev, NULL,
+                        ip6_rcv_finish);
+                return -1;
+#else
                 return 1;
+#endif
         }
 
 drop_unlock: