[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>
diff --git a/net/ipv4/xfrm4_input.c b/net/ipv4/xfrm4_input.c
index 2d3849c..850d919 100644
--- a/net/ipv4/xfrm4_input.c
+++ b/net/ipv4/xfrm4_input.c
@@ -11,6 +11,8 @@
#include <linux/module.h>
#include <linux/string.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv4.h>
#include <net/inet_ecn.h>
#include <net/ip.h>
#include <net/xfrm.h>
@@ -45,6 +47,23 @@
return xfrm_parse_spi(skb, nexthdr, spi, seq);
}
+#ifdef CONFIG_NETFILTER
+static inline int xfrm4_rcv_encap_finish(struct sk_buff *skb)
+{
+ struct iphdr *iph = skb->nh.iph;
+
+ if (skb->dst == NULL) {
+ if (ip_route_input(skb, iph->daddr, iph->saddr, iph->tos,
+ skb->dev))
+ goto drop;
+ }
+ return dst_input(skb);
+drop:
+ kfree_skb(skb);
+ return NET_RX_DROP;
+}
+#endif
+
int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
{
int err;
@@ -137,6 +156,8 @@
memcpy(skb->sp->x+skb->sp->len, xfrm_vec, xfrm_nr*sizeof(struct sec_decap_state));
skb->sp->len += xfrm_nr;
+ nf_reset(skb);
+
if (decaps) {
if (!(skb->dev->flags&IFF_LOOPBACK)) {
dst_release(skb->dst);
@@ -145,7 +166,17 @@
netif_rx(skb);
return 0;
} else {
+#ifdef CONFIG_NETFILTER
+ __skb_push(skb, skb->data - skb->nh.raw);
+ skb->nh.iph->tot_len = htons(skb->len);
+ ip_send_check(skb->nh.iph);
+
+ NF_HOOK(PF_INET, NF_IP_PRE_ROUTING, skb, skb->dev, NULL,
+ xfrm4_rcv_encap_finish);
+ return 0;
+#else
return -skb->nh.iph->protocol;
+#endif
}
drop_unlock: