/* SPDX-License-Identifier: GPL-2.0 */#ifndef _PFCP_H_#define _PFCP_H_ #include <uapi/linux/if_ether.h>#include <net/dst_metadata.h>#include <linux/netdevice.h>#include <uapi/linux/ipv6.h>#include <net/udp_tunnel.h>#include <uapi/linux/udp.h>#include <uapi/linux/ip.h>#include <linux/string.h>#include <linux/types.h>#include <linux/bits.h> #define PFCP_PORT 8805 /* PFCP protocol header */struct pfcphdr {	u8	flags;	u8	message_type;	__be16	message_length;}; /* PFCP header flags */#define PFCP_SEID_FLAG		BIT(0)#define PFCP_MP_FLAG		BIT(1) #define PFCP_VERSION_MASK	GENMASK(4, 0) #define PFCP_HLEN (sizeof(struct udphdr) + sizeof(struct pfcphdr)) /* PFCP node related messages */struct pfcphdr_node {	u8	seq_number[3];	u8	reserved;}; /* PFCP session related messages */struct pfcphdr_session {	__be64	seid;	u8	seq_number[3];#ifdef __LITTLE_ENDIAN_BITFIELD	u8	message_priority:4,		reserved:4;#elif defined(__BIG_ENDIAN_BITFIELD)	u8	reserved:4,		message_priority:4;#else#error "Please fix <asm/byteorder>"#endif}; struct pfcp_metadata {	u8 type;	__be64 seid;} __packed; enum {	PFCP_TYPE_NODE		= 0,	PFCP_TYPE_SESSION	= 1,}; #define PFCP_HEADROOM (sizeof(struct iphdr) + sizeof(struct udphdr) + \		       sizeof(struct pfcphdr) + sizeof(struct ethhdr))#define PFCP6_HEADROOM (sizeof(struct ipv6hdr) + sizeof(struct udphdr) + \			sizeof(struct pfcphdr) + sizeof(struct ethhdr)) static inline struct pfcphdr *pfcp_hdr(struct sk_buff *skb){	return (struct pfcphdr *)(udp_hdr(skb) + 1);} static inline struct pfcphdr_node *pfcp_hdr_node(struct sk_buff *skb){	return (struct pfcphdr_node *)(pfcp_hdr(skb) + 1);} static inline struct pfcphdr_session *pfcp_hdr_session(struct sk_buff *skb){	return (struct pfcphdr_session *)(pfcp_hdr(skb) + 1);} static inline bool netif_is_pfcp(const struct net_device *dev){	return dev->rtnl_link_ops &&	       !strcmp(dev->rtnl_link_ops->kind, "pfcp");} #endif