#ifndef __NET_IP_TUNNELS_H#define __NET_IP_TUNNELS_H 1 #include <linux/if_tunnel.h>#include <linux/netdevice.h>#include <linux/skbuff.h>#include <linux/types.h>#include <linux/u64_stats_sync.h>#include <net/dsfield.h>#include <net/gro_cells.h>#include <net/inet_ecn.h>#include <net/ip.h>#include <net/rtnetlink.h> #if IS_ENABLED(CONFIG_IPV6)#include <net/ipv6.h>#include <net/ip6_fib.h>#include <net/ip6_route.h>#endif /* Keep error state on tunnel for 30 sec */#define IPTUNNEL_ERR_TIMEO	(30*HZ) /* 6rd prefix/relay information */#ifdef CONFIG_IPV6_SIT_6RDstruct ip_tunnel_6rd_parm {	struct in6_addr		prefix;	__be32			relay_prefix;	u16			prefixlen;	u16			relay_prefixlen;};#endif struct ip_tunnel_prl_entry {	struct ip_tunnel_prl_entry __rcu *next;	__be32				addr;	u16				flags;	struct rcu_head			rcu_head;}; struct ip_tunnel {	struct ip_tunnel __rcu	*next;	struct hlist_node hash_node;	struct net_device	*dev;	struct net		*net;	/* netns for packet i/o */ 	int		err_count;	/* Number of arrived ICMP errors */	unsigned long	err_time;	/* Time when the last ICMP error					 * arrived */ 	/* These four fields used only by GRE */	__u32		i_seqno;	/* The last seen seqno	*/	__u32		o_seqno;	/* The last output seqno */	int		hlen;		/* Precalculated header length */	int		mlink; 	struct ip_tunnel_parm parms; 	/* for SIT */#ifdef CONFIG_IPV6_SIT_6RD	struct ip_tunnel_6rd_parm ip6rd;#endif	struct ip_tunnel_prl_entry __rcu *prl;	/* potential router list */	unsigned int		prl_count;	/* # of entries in PRL */	int			ip_tnl_net_id;	struct gro_cells	gro_cells;}; #define TUNNEL_CSUM	__cpu_to_be16(0x01)#define TUNNEL_ROUTING	__cpu_to_be16(0x02)#define TUNNEL_KEY	__cpu_to_be16(0x04)#define TUNNEL_SEQ	__cpu_to_be16(0x08)#define TUNNEL_STRICT	__cpu_to_be16(0x10)#define TUNNEL_REC	__cpu_to_be16(0x20)#define TUNNEL_VERSION	__cpu_to_be16(0x40)#define TUNNEL_NO_KEY	__cpu_to_be16(0x80)#define TUNNEL_DONT_FRAGMENT    __cpu_to_be16(0x0100) struct tnl_ptk_info {	__be16 flags;	__be16 proto;	__be32 key;	__be32 seq;}; #define PACKET_RCVD	0#define PACKET_REJECT	1 #define IP_TNL_HASH_BITS   7#define IP_TNL_HASH_SIZE   (1 << IP_TNL_HASH_BITS) struct ip_tunnel_net {	struct net_device *fb_tunnel_dev;	struct hlist_head tunnels[IP_TNL_HASH_SIZE];}; #ifdef CONFIG_INET int ip_tunnel_init(struct net_device *dev);void ip_tunnel_uninit(struct net_device *dev);void  ip_tunnel_dellink(struct net_device *dev, struct list_head *head);int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id,		       struct rtnl_link_ops *ops, char *devname); void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops); void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,		    const struct iphdr *tnl_params, const u8 protocol);int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd);int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu); struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev,						struct rtnl_link_stats64 *tot);struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn,				   int link, __be16 flags,				   __be32 remote, __be32 local,				   __be32 key); int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,		  const struct tnl_ptk_info *tpi, bool log_ecn_error);int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],			 struct ip_tunnel_parm *p);int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],		      struct ip_tunnel_parm *p);void ip_tunnel_setup(struct net_device *dev, int net_id); /* Extract dsfield from inner protocol */static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph,				       const struct sk_buff *skb){	if (skb->protocol == htons(ETH_P_IP))		return iph->tos;	else if (skb->protocol == htons(ETH_P_IPV6))		return ipv6_get_dsfield((const struct ipv6hdr *)iph);	else		return 0;} /* Propogate ECN bits out */static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph,				     const struct sk_buff *skb){	u8 inner = ip_tunnel_get_dsfield(iph, skb); 	return INET_ECN_encapsulate(tos, inner);} int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto);int iptunnel_xmit(struct rtable *rt, struct sk_buff *skb,		  __be32 src, __be32 dst, __u8 proto,		  __u8 tos, __u8 ttl, __be16 df, bool xnet); struct sk_buff *iptunnel_handle_offloads(struct sk_buff *skb, bool gre_csum,					 int gso_type_mask); static inline void iptunnel_xmit_stats(int err,				       struct net_device_stats *err_stats,				       struct pcpu_tstats __percpu *stats){	if (err > 0) {		struct pcpu_tstats *tstats = this_cpu_ptr(stats); 		u64_stats_update_begin(&tstats->syncp);		tstats->tx_bytes += err;		tstats->tx_packets++;		u64_stats_update_end(&tstats->syncp);	} else if (err < 0) {		err_stats->tx_errors++;		err_stats->tx_aborted_errors++;	} else {		err_stats->tx_dropped++;	}} #endif /* CONFIG_INET */ #endif /* __NET_IP_TUNNELS_H */