Merge branch 'ras-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...

[karo-tx-linux.git] / net / ipv4 / ip_gre.c

diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index bd0679d90519b170dc98369e9b438e4c31b152b9..614521437e30159c5234e9b24fcc41bad7ea6c6b 100644 (file)
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -498,10 +498,26 @@ static struct sk_buff *gre_handle_offloads(struct sk_buff *skb,
                                        csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
 }
 
+static struct rtable *gre_get_rt(struct sk_buff *skb,
+                                struct net_device *dev,
+                                struct flowi4 *fl,
+                                const struct ip_tunnel_key *key)
+{
+       struct net *net = dev_net(dev);
+
+       memset(fl, 0, sizeof(*fl));
+       fl->daddr = key->u.ipv4.dst;
+       fl->saddr = key->u.ipv4.src;
+       fl->flowi4_tos = RT_TOS(key->tos);
+       fl->flowi4_mark = skb->mark;
+       fl->flowi4_proto = IPPROTO_GRE;
+
+       return ip_route_output_key(net, fl);
+}
+
 static void gre_fb_xmit(struct sk_buff *skb, struct net_device *dev)
 {
        struct ip_tunnel_info *tun_info;
-       struct net *net = dev_net(dev);
        const struct ip_tunnel_key *key;
        struct flowi4 fl;
        struct rtable *rt;
@@ -516,14 +532,7 @@ static void gre_fb_xmit(struct sk_buff *skb, struct net_device *dev)
                goto err_free_skb;
 
        key = &tun_info->key;
-       memset(&fl, 0, sizeof(fl));
-       fl.daddr = key->u.ipv4.dst;
-       fl.saddr = key->u.ipv4.src;
-       fl.flowi4_tos = RT_TOS(key->tos);
-       fl.flowi4_mark = skb->mark;
-       fl.flowi4_proto = IPPROTO_GRE;
-
-       rt = ip_route_output_key(net, &fl);
+       rt = gre_get_rt(skb, dev, &fl, key);
        if (IS_ERR(rt))
                goto err_free_skb;
 
@@ -566,6 +575,24 @@ err_free_skb:
        dev->stats.tx_dropped++;
 }
 
+static int gre_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
+{
+       struct ip_tunnel_info *info = skb_tunnel_info(skb);
+       struct rtable *rt;
+       struct flowi4 fl4;
+
+       if (ip_tunnel_info_af(info) != AF_INET)
+               return -EINVAL;
+
+       rt = gre_get_rt(skb, dev, &fl4, &info->key);
+       if (IS_ERR(rt))
+               return PTR_ERR(rt);
+
+       ip_rt_put(rt);
+       info->key.u.ipv4.src = fl4.saddr;
+       return 0;
+}
+
 static netdev_tx_t ipgre_xmit(struct sk_buff *skb,
                              struct net_device *dev)
 {
@@ -1023,6 +1050,7 @@ static const struct net_device_ops gre_tap_netdev_ops = {
        .ndo_change_mtu         = ip_tunnel_change_mtu,
        .ndo_get_stats64        = ip_tunnel_get_stats64,
        .ndo_get_iflink         = ip_tunnel_get_iflink,
+       .ndo_fill_metadata_dst  = gre_fill_metadata_dst,
 };
 
 static void ipgre_tap_setup(struct net_device *dev)