MAJOR=10
MINOR=237
DEVNAME=loop-control
  $   ˆÄÃ„Ï _Âa–İm_J*j"Tâ€ÆÁp©‹FÿÁ ?÷     /* SPDX-License-Identifier: GPL-2.0 */
#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 <linux/bitops.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>
#include <net/dst_cache.h>

#if IS_ENABLED(CONFIG_IPV6)
#include <net/ipv6.h>
#include <net/ip6_fib.h>
#include <net/ip6_route.h>
#endif

#include <linux/rh_kabi.h>

/* 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				\
	(sizeof_field(struct ip_tunnel_key, u) -		\
	 sizeof_field(struct ip_tunnel_key, u.ipv4))

#define __ipt_flag_op(op, ...)					\
	op(__VA_ARGS__, __IP_TUNNEL_FLAG_NUM)

#define IP_TUNNEL_DECLARE_FLAGS(...)				\
	__ipt_flag_op(DECLARE_BITMAP, __VA_ARGS__)

#define ip_tunnel_flags_zero(...)	__ipt_flag_op(bitmap_zero, __VA_ARGS__)
#define ip_tunnel_flags_copy(...)	__ipt_flag_op(bitmap_copy, __VA_ARGS__)
#define ip_tunnel_flags_and(...)	__ipt_flag_op(bitmap_and, __VA_ARGS__)
#define ip_tunnel_flags_or(...)		__ipt_flag_op(bitmap_or, __VA_ARGS__)

#define ip_tunnel_flags_empty(...)				\
	__ipt_flag_op(bitmap_empty, __VA_ARGS__)
#define ip_tunnel_flags_intersect(...)				\
	__ipt_flag_op(bitmap_intersects, __VA_ARGS__)
#define ip_tunnel_flags_subset(...)				\
	__ipt_flag_op(bitmap_subset, __VA_ARGS__)

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;
	IP_TUNNEL_DECLARE_FLAGS(tun_flags);
	__be32			label;		/* Flow Label for IPv6 */
	u32			nhid;
	u8			tos;		/* TOS for IPv4, TC for IPv6 */
	u8			ttl;		/* TTL for IPv4, HL for IPv6 */
	__be16			tp_src;
	__be16			tp_dst;
	__u8			flow_flags;
};

/* 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 */
#define IP_TUNNEL_INFO_BRIDGE	0x04	/* represents a bridged tunnel id */

/* Maximum tunnel options length. */
#define IP_TUNNEL_OPTS_MAX					\
	GENMASK((sizeof_field(struct ip_tunnel_info,		\
			      options_len) * BITS_PER_BYTE) - 1, 0)

#define ip_tunnel_info_opts(info)				\
	_Generic(info,						\
		 const struct ip_tunnel_info * : ((const void *)(info)->options),\
		 struct ip_tunnel_info * : ((void *)(info)->options)\
	)

struct ip_tunnel_info {
	struct ip_tunnel_key	key;
#ifdef CONFIG_DST_CACHE
	struct dst_cache	dst_cache;
#endif
	u8			options_len;
	u8			mode;
	u8			options[] __aligned_largest __counted_by(options_len);
};

/* 6rd prefix/relay information */
#ifdef CONFIG_IPV6_SIT_6RD
struct 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 metadata_dst;

/* Kernel-side variant of ip_tunnel_parm */
struct ip_tunnel_parm_kern {
	char			name[IFNAMSIZ];
	IP_TUNNEL_DECLARE_FLAGS(i_flags);
	IP_TUNNEL_DECLARE_FLAGS(o_flags);
	__be32			i_key;
	__be32			o_key;
	int			link;
	struct iphdr		iph;

	RH_KABI_RESERVE(1)
	RH_KABI_RESERVE(2)
	RH_KABI_RESERVE(3)
	RH_KABI_RESERVE(4)
};

struct ip_tunnel {
	struct ip_tunnel __rcu	*next;
	struct hlist_node hash_node;

	struct net_device	*dev;
	netdevice_tracker	dev_tracker;

	struct net		*net;	/* netns for packet i/o */

	unsigned long	err_time;	/* Time when the last ICMP