vxlan: move IPv6 outpute route calculation to a function

Will be used also for ndo_fill_metadata_dst.

Signed-off-by: Jiri Benc <jbenc@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 6369a57..5a38558 100644 (file)
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -1848,6 +1848,34 @@ static int vxlan_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *sk
                                   !(vxflags & VXLAN_F_UDP_CSUM));
 }
 
+#if IS_ENABLED(CONFIG_IPV6)
+static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
+                                         struct sk_buff *skb, int oif,
+                                         const struct in6_addr *daddr,
+                                         struct in6_addr *saddr)
+{
+       struct dst_entry *ndst;
+       struct flowi6 fl6;
+       int err;
+
+       memset(&fl6, 0, sizeof(fl6));
+       fl6.flowi6_oif = oif;
+       fl6.daddr = *daddr;
+       fl6.saddr = vxlan->cfg.saddr.sin6.sin6_addr;
+       fl6.flowi6_mark = skb->mark;
+       fl6.flowi6_proto = IPPROTO_UDP;
+
+       err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
+                                        vxlan->vn6_sock->sock->sk,
+                                        &ndst, &fl6);
+       if (err < 0)
+               return ERR_PTR(err);
+
+       *saddr = fl6.saddr;
+       return ndst;
+}
+#endif
+
 /* Bypass encapsulation if the destination is local */
 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
                               struct vxlan_dev *dst_vxlan)
@@ -2035,21 +2063,17 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
 #if IS_ENABLED(CONFIG_IPV6)
        } else {
                struct dst_entry *ndst;
-               struct flowi6 fl6;
+               struct in6_addr saddr;
                u32 rt6i_flags;
 
                if (!vxlan->vn6_sock)
                        goto drop;
                sk = vxlan->vn6_sock->sock->sk;
 
-               memset(&fl6, 0, sizeof(fl6));
-               fl6.flowi6_oif = rdst ? rdst->remote_ifindex : 0;
-               fl6.daddr = dst->sin6.sin6_addr;
-               fl6.saddr = vxlan->cfg.saddr.sin6.sin6_addr;
-               fl6.flowi6_mark = skb->mark;
-               fl6.flowi6_proto = IPPROTO_UDP;
-
-               if (ipv6_stub->ipv6_dst_lookup(vxlan->net, sk, &ndst, &fl6)) {
+               ndst = vxlan6_get_route(vxlan, skb,
+                                       rdst ? rdst->remote_ifindex : 0,
+                                       &dst->sin6.sin6_addr, &saddr);
+               if (IS_ERR(ndst)) {
                        netdev_dbg(dev, "no route to %pI6\n",
                                   &dst->sin6.sin6_addr);
                        dev->stats.tx_carrier_errors++;
@@ -2081,7 +2105,7 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
                }
 
                ttl = ttl ? : ip6_dst_hoplimit(ndst);
-               err = vxlan6_xmit_skb(ndst, sk, skb, dev, &fl6.saddr, &fl6.daddr,
+               err = vxlan6_xmit_skb(ndst, sk, skb, dev, &saddr, &dst->sin6.sin6_addr,
                                      0, ttl, src_port, dst_port, htonl(vni << 8), md,
                                      !net_eq(vxlan->net, dev_net(vxlan->dev)),
                                      flags);