ip_tunnel:multicast process cause panic due to skb->_skb_refdst NULL pointer

[~andy/linux] / net / ipv4 / ip_tunnel_core.c

diff --git a/net/ipv4/ip_tunnel_core.c b/net/ipv4/ip_tunnel_core.c
index 6156f4ef5e919ccdc470f8cdb5a27593dedbe2c3..6f847dd56dbc7fb53a7f3dc9dfc8330e507ec0e9 100644 (file)
--- a/net/ipv4/ip_tunnel_core.c
+++ b/net/ipv4/ip_tunnel_core.c
@@ -108,7 +108,6 @@ int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto)
        nf_reset(skb);
        secpath_reset(skb);
        skb_clear_hash_if_not_l4(skb);
-       skb_dst_drop(skb);
        skb->vlan_tci = 0;
        skb_set_queue_mapping(skb, 0);
        skb->pkt_type = PACKET_HOST;
@@ -148,3 +147,49 @@ error:
        return ERR_PTR(err);
 }
 EXPORT_SYMBOL_GPL(iptunnel_handle_offloads);
+
+/* Often modified stats are per cpu, other are shared (netdev->stats) */
+struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev,
+                                               struct rtnl_link_stats64 *tot)
+{
+       int i;
+
+       for_each_possible_cpu(i) {
+               const struct pcpu_sw_netstats *tstats =
+                                                  per_cpu_ptr(dev->tstats, i);
+               u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
+               unsigned int start;
+
+               do {
+                       start = u64_stats_fetch_begin_bh(&tstats->syncp);
+                       rx_packets = tstats->rx_packets;
+                       tx_packets = tstats->tx_packets;
+                       rx_bytes = tstats->rx_bytes;
+                       tx_bytes = tstats->tx_bytes;
+               } while (u64_stats_fetch_retry_bh(&tstats->syncp, start));
+
+               tot->rx_packets += rx_packets;
+               tot->tx_packets += tx_packets;
+               tot->rx_bytes   += rx_bytes;
+               tot->tx_bytes   += tx_bytes;
+       }
+
+       tot->multicast = dev->stats.multicast;
+
+       tot->rx_crc_errors = dev->stats.rx_crc_errors;
+       tot->rx_fifo_errors = dev->stats.rx_fifo_errors;
+       tot->rx_length_errors = dev->stats.rx_length_errors;
+       tot->rx_frame_errors = dev->stats.rx_frame_errors;
+       tot->rx_errors = dev->stats.rx_errors;
+
+       tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
+       tot->tx_carrier_errors = dev->stats.tx_carrier_errors;
+       tot->tx_dropped = dev->stats.tx_dropped;
+       tot->tx_aborted_errors = dev->stats.tx_aborted_errors;
+       tot->tx_errors = dev->stats.tx_errors;
+
+       tot->collisions  = dev->stats.collisions;
+
+       return tot;
+}
+EXPORT_SYMBOL_GPL(ip_tunnel_get_stats64);