net: Introduce skb_tunnel_rx() helper

skb rxhash should be cleared when a skb is handled by a tunnel before
being delivered again, so that correct packet steering can take place.

There are other cleanups and accounting that we can factorize in a new
helper, skb_tunnel_rx()

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 8 insertions, 16 deletions

diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index 2599870747ec..8f39893d8081 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -723,14 +723,10 @@ static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol,
                 skb->protocol = htons(protocol);
                 skb->pkt_type = PACKET_HOST;
                 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
-                skb->dev = t->dev;
-                skb_dst_drop(skb);
-                nf_reset(skb);
 
-                dscp_ecn_decapsulate(t, ipv6h, skb);
+                skb_tunnel_rx(skb, t->dev);
 
-                t->dev->stats.rx_packets++;
-                t->dev->stats.rx_bytes += skb->len;
+                dscp_ecn_decapsulate(t, ipv6h, skb);
                 netif_rx(skb);
                 rcu_read_unlock();
                 return 0;
diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index 163850e22b11..bd9e7d3e9c8e 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -658,14 +658,12 @@ static int pim6_rcv(struct sk_buff *skb)
         skb->mac_header = skb->network_header;
         skb_pull(skb, (u8 *)encap - skb->data);
         skb_reset_network_header(skb);
-        skb->dev = reg_dev;
         skb->protocol = htons(ETH_P_IPV6);
         skb->ip_summed = 0;
         skb->pkt_type = PACKET_HOST;
-        skb_dst_drop(skb);
-        reg_dev->stats.rx_bytes += skb->len;
-        reg_dev->stats.rx_packets++;
-        nf_reset(skb);
+
+        skb_tunnel_rx(skb, reg_dev);
+
         netif_rx(skb);
         dev_put(reg_dev);
         return 0;
diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index 5abae10cd884..e51e650ea80b 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -566,11 +566,9 @@ static int ipip6_rcv(struct sk_buff *skb)
                         kfree_skb(skb);
                         return 0;
                 }
-                tunnel->dev->stats.rx_packets++;
-                tunnel->dev->stats.rx_bytes += skb->len;
-                skb->dev = tunnel->dev;
-                skb_dst_drop(skb);
-                nf_reset(skb);
+
+                skb_tunnel_rx(skb, tunnel->dev);
+
                 ipip6_ecn_decapsulate(iph, skb);
                 netif_rx(skb);
                 rcu_read_unlock();