vxlan: metadata based tunneling for IPv6

Support metadata based (formerly flow based) tunneling also for IPv6.
This complements commit ee122c79d422 ("vxlan: Flow based tunneling").

Signed-off-by: Jiri Benc <jbenc@redhat.com>
Acked-by: Thomas Graf <tgraf@suug.ch>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 2c1abf9..54615bb 100644 (file)
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -1269,17 +1269,27 @@ static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
        }
 
        if (vxlan_collect_metadata(vs)) {
-               const struct iphdr *iph = ip_hdr(skb);
-
                tun_dst = metadata_dst_alloc(sizeof(*md), GFP_ATOMIC);
                if (!tun_dst)
                        goto drop;
 
                info = &tun_dst->u.tun_info;
-               info->key.u.ipv4.src = iph->saddr;
-               info->key.u.ipv4.dst = iph->daddr;
-               info->key.tos = iph->tos;
-               info->key.ttl = iph->ttl;
+               if (vxlan_get_sk_family(vs) == AF_INET) {
+                       const struct iphdr *iph = ip_hdr(skb);
+
+                       info->key.u.ipv4.src = iph->saddr;
+                       info->key.u.ipv4.dst = iph->daddr;
+                       info->key.tos = iph->tos;
+                       info->key.ttl = iph->ttl;
+               } else {
+                       const struct ipv6hdr *ip6h = ipv6_hdr(skb);
+
+                       info->key.u.ipv6.src = ip6h->saddr;
+                       info->key.u.ipv6.dst = ip6h->daddr;
+                       info->key.tos = ipv6_get_dsfield(ip6h);
+                       info->key.ttl = ip6h->hop_limit;
+               }
+
                info->key.tp_src = udp_hdr(skb)->source;
                info->key.tp_dst = udp_hdr(skb)->dest;
 
@@ -1894,6 +1904,7 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
        struct ip_tunnel_info *info;
        struct vxlan_dev *vxlan = netdev_priv(dev);
        struct sock *sk = vxlan->vn_sock->sock->sk;
+       unsigned short family = vxlan_get_sk_family(vxlan->vn_sock);
        struct rtable *rt = NULL;
        const struct iphdr *old_iph;
        struct flowi4 fl4;
@@ -1908,7 +1919,6 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
        int err;
        u32 flags = vxlan->flags;
 
-       /* FIXME: Support IPv6 */
        info = skb_tunnel_info(skb);
 
        if (rdst) {
@@ -1924,8 +1934,11 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
 
                dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
                vni = be64_to_cpu(info->key.tun_id);
-               remote_ip.sin.sin_family = AF_INET;
-               remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
+               remote_ip.sa.sa_family = family;
+               if (family == AF_INET)
+                       remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
+               else
+                       remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
                dst = &remote_ip;
        }
 
@@ -1951,23 +1964,24 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
        src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
                                     vxlan->cfg.port_max, true);
 
+       if (info) {
+               if (info->key.tun_flags & TUNNEL_CSUM)
+                       flags |= VXLAN_F_UDP_CSUM;
+               else
+                       flags &= ~VXLAN_F_UDP_CSUM;
+
+               ttl = info->key.ttl;
+               tos = info->key.tos;
+
+               if (info->options_len)
+                       md = ip_tunnel_info_opts(info, sizeof(*md));
+       } else {
+               md->gbp = skb->mark;
+       }
+
        if (dst->sa.sa_family == AF_INET) {
-               if (info) {
-                       if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT)
-                               df = htons(IP_DF);
-                       if (info->key.tun_flags & TUNNEL_CSUM)
-                               flags |= VXLAN_F_UDP_CSUM;
-                       else
-                               flags &= ~VXLAN_F_UDP_CSUM;
-
-                       ttl = info->key.ttl;
-                       tos = info->key.tos;
-
-                       if (info->options_len)
-                               md = ip_tunnel_info_opts(info, sizeof(*md));
-               } else {
-                       md->gbp = skb->mark;
-               }
+               if (info && (info->key.tun_flags & TUNNEL_DONT_FRAGMENT))
+                       df = htons(IP_DF);
 
                memset(&fl4, 0, sizeof(fl4));
                fl4.flowi4_oif = rdst ? rdst->remote_ifindex : 0;
@@ -2066,12 +2080,10 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
                }
 
                ttl = ttl ? : ip6_dst_hoplimit(ndst);
-               md->gbp = skb->mark;
-
                err = vxlan6_xmit_skb(ndst, sk, skb, dev, &fl6.saddr, &fl6.daddr,
                                      0, ttl, src_port, dst_port, htonl(vni << 8), md,
                                      !net_eq(vxlan->net, dev_net(vxlan->dev)),
-                                     vxlan->flags);
+                                     flags);
 #endif
        }
 
@@ -2104,7 +2116,6 @@ static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
        struct vxlan_rdst *rdst, *fdst = NULL;
        struct vxlan_fdb *f;
 
-       /* FIXME: Support IPv6 */
        info = skb_tunnel_info(skb);
 
        skb_reset_mac_header(skb);