#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/socket.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/netns/generic.h>#include <net/rtnetlink.h>#include <net/lwtunnel.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) /* Used to memset ip_tunnel padding. */#define IP_TUNNEL_KEY_SIZE	offsetofend(struct ip_tunnel_key, tp_dst) /* Used to memset ipv4 address padding. */#define IP_TUNNEL_KEY_IPV4_PAD	offsetofend(struct ip_tunnel_key, u.ipv4.dst)#define IP_TUNNEL_KEY_IPV4_PAD_LEN				\	(FIELD_SIZEOF(struct ip_tunnel_key, u) -		\	 FIELD_SIZEOF(struct ip_tunnel_key, u.ipv4)) struct ip_tunnel_key {	__be64			tun_id;	union {		struct {			__be32	src;			__be32	dst;		} ipv4;		struct {			struct in6_addr src;			struct in6_addr dst;		} ipv6;	} u;	__be16			tun_flags;	u8			tos;		/* TOS for IPv4, TC for IPv6 */	u8			ttl;		/* TTL for IPv4, HL for IPv6 */	__be16			tp_src;	__be16			tp_dst;}; /* Flags for ip_tunnel_info mode. */#define IP_TUNNEL_INFO_TX	0x01	/* represents tx tunnel parameters */#define IP_TUNNEL_INFO_IPV6	0x02	/* key contains IPv6 addresses */ struct ip_tunnel_info {	struct ip_tunnel_key	key;	u8			options_len;	u8			mode;}; /* 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_encap {	u16			type;	u16			flags;	__be16			sport;	__be16			dport;}; struct ip_tunnel_prl_entry {	struct ip_tunnel_prl_entry __rcu *next;	__be32				addr;	u16				flags;	struct rcu_head			rcu_head;}; struct ip_tunnel_dst {	struct dst_entry __rcu 		*dst;	__be32				 saddr;}; struct metadata_dst; 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		tun_hlen;	/* Precalculated header length */	int		mlink; 	struct ip_tunnel_dst __percpu *dst_cache; 	struct ip_tunnel_parm parms; 	int		encap_hlen;	/* Encap header length (FOU,GUE) */	struct ip_tunnel_encap encap; 	int		hlen;		/* tun_hlen + encap_hlen */ 	/* 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;	bool			collect_md;}; #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)#define TUNNEL_OAM		__cpu_to_be16(0x0200)#define TUNNEL_CRIT_OPT		__cpu_to_be16(0x0400)#define TUNNEL_GENEVE_OPT	__cpu_to_be16(0x0800)#define TUNNEL_VXLAN_OPT	__cpu_to_be16(0x1000) #define TUNNEL_OPTIONS_PRESENT	(TUNNEL_GENEVE_OPT | TUNNEL_VXLAN_OPT) 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];	struct ip_tunnel __rcu *collect_md_tun;}; struct ip_tunnel_encap_ops {	size_t (*encap_hlen)(struct ip_tunnel_encap *e);	int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e,			    u8 *protocol, struct flowi4 *fl4);}; #define MAX_IPTUN_ENCAP_OPS 8 extern const struct ip_tunnel_encap_ops __rcu *		iptun_encaps[MAX_IPTUN_ENCAP_OPS]; int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *op,			    unsigned int num);int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *op,			    unsigned int num); static inline void ip_tunnel_key_init(struct ip_tunnel_key *key,				      __be32 saddr, __be32 daddr,				      u8 tos, u8 ttl,				      __be16 tp_src, __be16 tp_dst,				      __be64 tun_id, __be16 tun_flags){	key->tun_id = tun_id;	key->u.ipv4.src = saddr;	key->u.ipv4.dst = daddr;	memset((unsigned char *)key + IP_TUNNEL_KEY_IPV4_PAD,	       0, IP_TUNNEL_KEY_IPV4_PAD_LEN);	key->tos = tos;	key->ttl = ttl;	key->tun_flags = tun_flags; 	/* For the tunnel types on the top of IPsec, the tp_src and tp_dst of	 * the upper tunnel are used.	 * E.g: GRE over IPSEC, the tp_src and tp_port are zero.	 */	key->tp_src = tp_src;	key->tp_dst = tp_dst; 	/* Clear struct padding. */	if (sizeof(*key) != IP_TUNNEL_KEY_SIZE)		memset((unsigned char *)key + IP_TUNNEL_KEY_SIZE,		       0, sizeof(*key) - IP_TUNNEL_KEY_SIZE);} static inline unsigned short ip_tunnel_info_af(const struct ip_tunnel_info					       *tun_info){	return tun_info->mode & IP_TUNNEL_INFO_IPV6 ? AF_INET6 : AF_INET;} #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);struct net *ip_tunnel_get_link_net(const struct net_device *dev);int ip_tunnel_get_iflink(const struct net_device *dev);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_encap(struct sk_buff *skb, struct ip_tunnel *t,		    u8 *protocol, struct flowi4 *fl4);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, struct metadata_dst *tun_dst,		  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);void ip_tunnel_dst_reset_all(struct ip_tunnel *t);int ip_tunnel_encap_setup(struct ip_tunnel *t,			  struct ip_tunnel_encap *ipencap); /* 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 sock *sk, struct rtable *rt, struct sk_buff *skb,		  __be32 src, __be32 dst, u8 proto,		  u8 tos, u8 ttl, __be16 df, bool xnet);struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md,					     gfp_t flags); 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_sw_netstats __percpu *stats){	if (err > 0) {		struct pcpu_sw_netstats *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++;	}} static inline void *ip_tunnel_info_opts(struct ip_tunnel_info *info){	return info + 1;} static inline void ip_tunnel_info_opts_get(void *to,					   const struct ip_tunnel_info *info){	memcpy(to, info + 1, info->options_len);} static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info,					   const void *from, int len){	memcpy(ip_tunnel_info_opts(info), from, len);	info->options_len = len;} static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate){	return (struct ip_tunnel_info *)lwtstate->data;} extern struct static_key ip_tunnel_metadata_cnt; /* Returns > 0 if metadata should be collected */static inline int ip_tunnel_collect_metadata(void){	return static_key_false(&ip_tunnel_metadata_cnt);} void __init ip_tunnel_core_init(void); void ip_tunnel_need_metadata(void);void ip_tunnel_unneed_metadata(void); #else /* CONFIG_INET */ static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate){	return NULL;} static inline void ip_tunnel_need_metadata(void){} static inline void ip_tunnel_unneed_metadata(void){} #endif /* CONFIG_INET */ #endif /* __NET_IP_TUNNELS_H */