include/net/vxlan.h

   1 #ifndef __NET_VXLAN_H
   2 #define __NET_VXLAN_H 1
   3
   4 #include <linux/skbuff.h>
   5 #include <linux/netdevice.h>
   6 #include <linux/udp.h>
   7
   8 #define VNI_HASH_BITS   10
   9 #define VNI_HASH_SIZE   (1<<VNI_HASH_BITS)
  10
  11 /* VXLAN protocol header */
  12 struct vxlanhdr {
  13         __be32 vx_flags;
  14         __be32 vx_vni;
  15 };
  16
  17 struct vxlan_sock;
  18 typedef void (vxlan_rcv_t)(struct vxlan_sock *vh, struct sk_buff *skb, __be32 key);
  19
  20 /* per UDP socket information */
  21 struct vxlan_sock {
  22         struct hlist_node hlist;
  23         vxlan_rcv_t      *rcv;
  24         void             *data;
  25         struct work_struct del_work;
  26         struct socket    *sock;
  27         struct rcu_head   rcu;
  28         struct hlist_head vni_list[VNI_HASH_SIZE];
  29         atomic_t          refcnt;
  30         struct udp_offload udp_offloads;
  31 };
  32
  33 #define VXLAN_F_LEARN                   0x01
  34 #define VXLAN_F_PROXY                   0x02
  35 #define VXLAN_F_RSC                     0x04
  36 #define VXLAN_F_L2MISS                  0x08
  37 #define VXLAN_F_L3MISS                  0x10
  38 #define VXLAN_F_IPV6                    0x20
  39 #define VXLAN_F_UDP_CSUM                0x40
  40 #define VXLAN_F_UDP_ZERO_CSUM6_TX       0x80
  41 #define VXLAN_F_UDP_ZERO_CSUM6_RX       0x100
  42
  43 struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
  44                                   vxlan_rcv_t *rcv, void *data,
  45                                   bool no_share, u32 flags);
  46
  47 void vxlan_sock_release(struct vxlan_sock *vs);
  48
  49 int vxlan_xmit_skb(struct vxlan_sock *vs,
  50                    struct rtable *rt, struct sk_buff *skb,
  51                    __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
  52                    __be16 src_port, __be16 dst_port, __be32 vni, bool xnet);
  53
  54 static inline bool vxlan_gso_check(struct sk_buff *skb)
  55 {
  56         if ((skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL) &&
  57             (skb->inner_protocol_type != ENCAP_TYPE_ETHER ||
  58              skb->inner_protocol != htons(ETH_P_TEB) ||
  59              (skb_inner_mac_header(skb) - skb_transport_header(skb) !=
  60               sizeof(struct udphdr) + sizeof(struct vxlanhdr))))
  61                 return false;
  62
  63         return true;
  64 }
  65
  66 /* IP header + UDP + VXLAN + Ethernet header */
  67 #define VXLAN_HEADROOM (20 + 8 + 8 + 14)
  68 /* IPv6 header + UDP + VXLAN + Ethernet header */
  69 #define VXLAN6_HEADROOM (40 + 8 + 8 + 14)
  70
  71 #if IS_ENABLED(CONFIG_VXLAN)
  72 void vxlan_get_rx_port(struct net_device *netdev);
  73 #else
  74 static inline void vxlan_get_rx_port(struct net_device *netdev)
  75 {
  76 }
  77 #endif
  78 #endif