#ifndef __NET_VXLAN_H#define __NET_VXLAN_H 1 #include <linux/ip.h>#include <linux/ipv6.h>#include <linux/if_vlan.h>#include <linux/skbuff.h>#include <linux/netdevice.h>#include <linux/udp.h> #define VNI_HASH_BITS	10#define VNI_HASH_SIZE	(1<<VNI_HASH_BITS) /* * VXLAN Group Based Policy Extension: * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * |1|-|-|-|1|-|-|-|R|D|R|R|A|R|R|R|        Group Policy ID        | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * |                VXLAN Network Identifier (VNI) |   Reserved    | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * * D = Don't Learn bit. When set, this bit indicates that the egress *     VTEP MUST NOT learn the source address of the encapsulated frame. * * A = Indicates that the group policy has already been applied to *     this packet. Policies MUST NOT be applied by devices when the *     A bit is set. * * [0] https://tools.ietf.org/html/draft-smith-vxlan-group-policy */struct vxlanhdr_gbp {	__u8	vx_flags;#ifdef __LITTLE_ENDIAN_BITFIELD	__u8	reserved_flags1:3,		policy_applied:1,		reserved_flags2:2,		dont_learn:1,		reserved_flags3:1;#elif defined(__BIG_ENDIAN_BITFIELD)	__u8	reserved_flags1:1,		dont_learn:1,		reserved_flags2:2,		policy_applied:1,		reserved_flags3:3;#else#error	"Please fix <asm/byteorder.h>"#endif	__be16	policy_id;	__be32	vx_vni;}; #define VXLAN_GBP_USED_BITS (VXLAN_HF_GBP | 0xFFFFFF) /* skb->mark mapping * * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * |R|R|R|R|R|R|R|R|R|D|R|R|A|R|R|R|        Group Policy ID        | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */#define VXLAN_GBP_DONT_LEARN		(BIT(6) << 16)#define VXLAN_GBP_POLICY_APPLIED	(BIT(3) << 16)#define VXLAN_GBP_ID_MASK		(0xFFFF) /* VXLAN protocol header: * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * |G|R|R|R|I|R|R|C|               Reserved                        | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * |                VXLAN Network Identifier (VNI) |   Reserved    | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * * G = 1	Group Policy (VXLAN-GBP) * I = 1	VXLAN Network Identifier (VNI) present * C = 1	Remote checksum offload (RCO) */struct vxlanhdr {	__be32 vx_flags;	__be32 vx_vni;}; /* VXLAN header flags. */#define VXLAN_HF_RCO BIT(24)#define VXLAN_HF_VNI BIT(27)#define VXLAN_HF_GBP BIT(31) /* Remote checksum offload header option */#define VXLAN_RCO_MASK  0x7f    /* Last byte of vni field */#define VXLAN_RCO_UDP   0x80    /* Indicate UDP RCO (TCP when not set *) */#define VXLAN_RCO_SHIFT 1       /* Left shift of start */#define VXLAN_RCO_SHIFT_MASK ((1 << VXLAN_RCO_SHIFT) - 1)#define VXLAN_MAX_REMCSUM_START (VXLAN_RCO_MASK << VXLAN_RCO_SHIFT) #define VXLAN_N_VID     (1u << 24)#define VXLAN_VID_MASK  (VXLAN_N_VID - 1)#define VXLAN_VNI_MASK  (VXLAN_VID_MASK << 8)#define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr)) struct vxlan_metadata {	__be32		vni;	u32		gbp;}; struct vxlan_sock;typedef void (vxlan_rcv_t)(struct vxlan_sock *vh, struct sk_buff *skb,			   struct vxlan_metadata *md); /* per UDP socket information */struct vxlan_sock {	struct hlist_node hlist;	vxlan_rcv_t	 *rcv;	void		 *data;	struct work_struct del_work;	struct socket	 *sock;	struct rcu_head	  rcu;	struct hlist_head vni_list[VNI_HASH_SIZE];	atomic_t	  refcnt;	struct udp_offload udp_offloads;	u32		  flags;}; #define VXLAN_F_LEARN			0x01#define VXLAN_F_PROXY			0x02#define VXLAN_F_RSC			0x04#define VXLAN_F_L2MISS			0x08#define VXLAN_F_L3MISS			0x10#define VXLAN_F_IPV6			0x20#define VXLAN_F_UDP_CSUM		0x40#define VXLAN_F_UDP_ZERO_CSUM6_TX	0x80#define VXLAN_F_UDP_ZERO_CSUM6_RX	0x100#define VXLAN_F_REMCSUM_TX		0x200#define VXLAN_F_REMCSUM_RX		0x400#define VXLAN_F_GBP			0x800#define VXLAN_F_REMCSUM_NOPARTIAL	0x1000 /* Flags that are used in the receive path. These flags must match in * order for a socket to be shareable */#define VXLAN_F_RCV_FLAGS		(VXLAN_F_GBP |			\					 VXLAN_F_UDP_ZERO_CSUM6_RX |	\					 VXLAN_F_REMCSUM_RX |		\					 VXLAN_F_REMCSUM_NOPARTIAL) struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,				  vxlan_rcv_t *rcv, void *data,				  bool no_share, u32 flags); void vxlan_sock_release(struct vxlan_sock *vs); int vxlan_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,		   __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,		   __be16 src_port, __be16 dst_port, struct vxlan_metadata *md,		   bool xnet, u32 vxflags); static inline netdev_features_t vxlan_features_check(struct sk_buff *skb,						     netdev_features_t features){	u8 l4_hdr = 0; 	if (!skb->encapsulation)		return features; 	switch (vlan_get_protocol(skb)) {	case htons(ETH_P_IP):		l4_hdr = ip_hdr(skb)->protocol;		break;	case htons(ETH_P_IPV6):		l4_hdr = ipv6_hdr(skb)->nexthdr;		break;	default:		return features;;	} 	if ((l4_hdr == IPPROTO_UDP) &&	    (skb->inner_protocol_type != ENCAP_TYPE_ETHER ||	     skb->inner_protocol != htons(ETH_P_TEB) ||	     (skb_inner_mac_header(skb) - skb_transport_header(skb) !=	      sizeof(struct udphdr) + sizeof(struct vxlanhdr))))		return features & ~(NETIF_F_ALL_CSUM | NETIF_F_GSO_MASK); 	return features;} /* IP header + UDP + VXLAN + Ethernet header */#define VXLAN_HEADROOM (20 + 8 + 8 + 14)/* IPv6 header + UDP + VXLAN + Ethernet header */#define VXLAN6_HEADROOM (40 + 8 + 8 + 14) #if IS_ENABLED(CONFIG_VXLAN)void vxlan_get_rx_port(struct net_device *netdev);#elsestatic inline void vxlan_get_rx_port(struct net_device *netdev){}#endif#endif