text: /* SPDX-License-Identifier: GPL-2.0 */
  /*
   * ipv4 in net namespaces
   */
  
  #ifndef __NETNS_IPV4_H__
  #define __NETNS_IPV4_H__
  
  #include <linux/uidgid.h>
  #include <net/inet_frag.h>
  #include <linux/rcupdate.h>
  
  struct tcpm_hash_bucket;
  struct ctl_table_header;
  struct ipv4_devconf;
  struct fib_rules_ops;
  struct hlist_head;
  struct fib_table;
  struct sock;
  struct local_ports {
  	seqlock_t	lock;
  	int		range[2];
  	bool		warned;
  };
  
  struct ping_group_range {
  	seqlock_t	lock;
  	kgid_t		range[2];
  };
  
  struct inet_hashinfo;
  
  struct inet_timewait_death_row {
  	atomic_t		tw_count;
  
  	struct inet_hashinfo 	*hashinfo ____cacheline_aligned_in_smp;
  	int			sysctl_max_tw_buckets;
  };
  
  struct tcp_fastopen_context;
  
  struct netns_ipv4 {
  #ifdef CONFIG_SYSCTL
  	struct ctl_table_header	*forw_hdr;
  	struct ctl_table_header	*frags_hdr;
  	struct ctl_table_header	*ipv4_hdr;
  	struct ctl_table_header *route_hdr;
  	struct ctl_table_header *xfrm4_hdr;
  #endif
  	struct ipv4_devconf	*devconf_all;
  	struct ipv4_devconf	*devconf_dflt;
  #ifdef CONFIG_IP_MULTIPLE_TABLES
  	struct fib_rules_ops	*rules_ops;
  	bool			fib_has_custom_rules;
  	struct fib_table __rcu	*fib_main;
  	struct fib_table __rcu	*fib_default;
  #endif
  	bool			fib_has_custom_local_routes;
  #ifdef CONFIG_IP_ROUTE_CLASSID
  	int			fib_num_tclassid_users;
  #endif
  	struct hlist_head	*fib_table_hash;
  	bool			fib_offload_disabled;
  	struct sock		*fibnl;
  
  	struct sock  * __percpu	*icmp_sk;
  	struct sock		*mc_autojoin_sk;
  
  	struct inet_peer_base	*peers;
  	struct sock  * __percpu	*tcp_sk;
  	struct netns_frags	frags;
  #ifdef CONFIG_NETFILTER
  	struct xt_table		*iptable_filter;
  	struct xt_table		*iptable_mangle;
  	struct xt_table		*iptable_raw;
  	struct xt_table		*arptable_filter;
  #ifdef CONFIG_SECURITY
  	struct xt_table		*iptable_security;
  #endif
  	struct xt_table		*nat_table;
  #endif
  
  	int sysctl_icmp_echo_ignore_all;
  	int sysctl_icmp_echo_ignore_broadcasts;
  	int sysctl_icmp_ignore_bogus_error_responses;
  	int sysctl_icmp_ratelimit;
  	int sysctl_icmp_ratemask;
  	int sysctl_icmp_errors_use_inbound_ifaddr;
  
  	struct local_ports ip_local_ports;
  
  	int sysctl_tcp_ecn;
  	int sysctl_tcp_ecn_fallback;
  
  	int sysctl_ip_default_ttl;
  	int sysctl_ip_no_pmtu_disc;
  	int sysctl_ip_fwd_use_pmtu;
  	int sysctl_ip_nonlocal_bind;
  	/* Shall we try to damage output packets if routing dev changes? */
  	int sysctl_ip_dynaddr;
  	int sysctl_ip_early_demux;
  	int sysctl_tcp_early_demux;
  	int sysctl_udp_early_demux;
  
  	int sysctl_fwmark_reflect;
  	int sysctl_tcp_fwmark_accept;
  #ifdef CONFIG_NET_L3_MASTER_DEV
  	int sysctl_tcp_l3mdev_accept;
  #endif
  	int sysctl_tcp_mtu_probing;
  	int sysctl_tcp_base_mss;
  	int sysctl_tcp_probe_threshold;
  	u32 sysctl_tcp_probe_interval;
  
  	int sysctl_tcp_keepalive_time;
  	int sysctl_tcp_keepalive_probes;
  	int sysctl_tcp_keepalive_intvl;
  
  	int sysctl_tcp_syn_retries;
  	int sysctl_tcp_synack_retries;
  	int sysctl_tcp_syncookies;
  	int sysctl_tcp_reordering;
  	int sysctl_tcp_retries1;
  	int sysctl_tcp_retries2;
  	int sysctl_tcp_orphan_retries;
  	int sysctl_tcp_fin_timeout;
  	unsigned int sysctl_tcp_notsent_lowat;
  	int sysctl_tcp_tw_reuse;
  	int sysctl_tcp_sack;
  	int sysctl_tcp_window_scaling;
  	int sysctl_tcp_timestamps;
  	int sysctl_tcp_early_retrans;
  	int sysctl_tcp_recovery;
  	int sysctl_tcp_thin_linear_timeouts;
  	int sysctl_tcp_slow_start_after_idle;
  	int sysctl_tcp_retrans_collapse;
  	int sysctl_tcp_stdurg;
  	int sysctl_tcp_rfc1337;
  	int sysctl_tcp_abort_on_overflow;
  	int sysctl_tcp_fack;
  	int sysctl_tcp_max_reordering;
  	int sysctl_tcp_dsack;
  	int sysctl_tcp_app_win;
  	int sysctl_tcp_adv_win_scale;
  	int sysctl_tcp_frto;
  	int sysctl_tcp_nometrics_save;
  	int sysctl_tcp_moderate_rcvbuf;
  	int sysctl_tcp_tso_win_divisor;
  	int sysctl_tcp_workaround_signed_windows;
  	int sysctl_tcp_limit_output_bytes;
  	int sysctl_tcp_challenge_ack_limit;
  	int sysctl_tcp_min_tso_segs;
  	int sysctl_tcp_min_rtt_wlen;
  	int sysctl_tcp_autocorking;
  	int sysctl_tcp_invalid_ratelimit;
  	int sysctl_tcp_pacing_ss_ratio;
  	int sysctl_tcp_pacing_ca_ratio;
  	int sysctl_tcp_wmem[3];
  	int sysctl_tcp_rmem[3];
  	struct inet_timewait_death_row tcp_death_row;
  	int sysctl_max_syn_backlog;
  	int sysctl_tcp_fastopen;
  	const struct tcp_congestion_ops __rcu  *tcp_congestion_control;
  	struct tcp_fastopen_context __rcu *tcp_fastopen_ctx;
  	spinlock_t tcp_fastopen_ctx_lock;
  	unsigned int sysctl_tcp_fastopen_blackhole_timeout;
  	atomic_t tfo_active_disable_times;
  	unsigned long tfo_active_disable_stamp;
  
  #ifdef CONFIG_NET_L3_MASTER_DEV
  	int sysctl_udp_l3mdev_accept;
  #endif
  
  	int sysctl_igmp_max_memberships;
  	int sysctl_igmp_max_msf;
  	int sysctl_igmp_llm_reports;
  	int sysctl_igmp_qrv;
  
  	struct ping_group_range ping_group_range;
  
  	atomic_t dev_addr_genid;
  
  #ifdef CONFIG_SYSCTL
  	unsigned long *sysctl_local_reserved_ports;
  	int sysctl_ip_prot_sock;
  #endif
  
  #ifdef CONFIG_IP_MROUTE
  #ifndef CONFIG_IP_MROUTE_MULTIPLE_TABLES
  	struct mr_table		*mrt;
  #else
  	struct list_head	mr_tables;
  	struct fib_rules_ops	*mr_rules_ops;
  #endif
  #endif
  #ifdef CONFIG_IP_ROUTE_MULTIPATH
  	int sysctl_fib_multipath_use_neigh;
  	int sysctl_fib_multipath_hash_policy;
  #endif
  
  	struct fib_notifier_ops	*notifier_ops;
  	unsigned int	fib_seq;	/* protected by rtnl_mutex */
  
  	struct fib_notifier_ops	*ipmr_notifier_ops;
  	unsigned int	ipmr_seq;	/* protected by rtnl_mutex */
  
  	atomic_t	rt_genid;
  };
  #endif
  