/* 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>#include <linux/seqlock.h>#include <linux/siphash.h> struct ctl_table_header;struct ipv4_devconf;struct fib_rules_ops;struct hlist_head;struct fib_table;struct sock;struct local_ports {	u32		range;	/* high << 16 | low */	bool		warned;}; struct ping_group_range {	seqlock_t	lock;	kgid_t		range[2];}; struct inet_hashinfo; struct inet_timewait_death_row {	refcount_t		tw_refcount; 	/* Padding to avoid false sharing, tw_refcount can be often written */	struct inet_hashinfo 	*hashinfo ____cacheline_aligned_in_smp;	int			sysctl_max_tw_buckets;}; struct tcp_fastopen_context; #ifdef CONFIG_IP_ROUTE_MULTIPATHstruct sysctl_fib_multipath_hash_seed {	u32 user_seed;	u32 mp_seed;};#endif struct udp_tunnel_gro {	struct sock __rcu *sk;	struct hlist_head list;}; struct netns_ipv4 {	/* Cacheline organization can be found documented in	 * Documentation/networking/net_cachelines/netns_ipv4_sysctl.rst.	 * Please update the document when adding new fields.	 */ 	/* TX readonly hotpath cache lines */	__cacheline_group_begin(netns_ipv4_read_tx);	u8 sysctl_tcp_early_retrans;	u8 sysctl_tcp_tso_win_divisor;	u8 sysctl_tcp_tso_rtt_log;	u8 sysctl_tcp_autocorking;	int sysctl_tcp_min_snd_mss;	unsigned int sysctl_tcp_notsent_lowat;	int sysctl_tcp_limit_output_bytes;	int sysctl_tcp_min_rtt_wlen;	int sysctl_tcp_wmem[3];	u8 sysctl_ip_fwd_use_pmtu;	__cacheline_group_end(netns_ipv4_read_tx); 	/* TXRX readonly hotpath cache lines */	__cacheline_group_begin(netns_ipv4_read_txrx);	u8		sysctl_tcp_shrink_window;	__cacheline_group_end(netns_ipv4_read_txrx); 	/* RX readonly hotpath cache line */	__cacheline_group_begin(netns_ipv4_read_rx);	u8 sysctl_tcp_moderate_rcvbuf;	u8 sysctl_ip_early_demux;	u8 sysctl_tcp_early_demux;	u8 sysctl_tcp_l3mdev_accept;	/* 3 bytes hole, try to pack */	int sysctl_tcp_reordering;	int sysctl_tcp_rmem[3];	int sysctl_tcp_rcvbuf_low_rtt;	__cacheline_group_end(netns_ipv4_read_rx); 	/* ICMP rate limiter hot cache line. */	__cacheline_group_begin_aligned(icmp);	atomic_t	icmp_global_credit;	u32		icmp_global_stamp;	__cacheline_group_end_aligned(icmp); 	struct inet_timewait_death_row tcp_death_row;	struct udp_table *udp_table; #if IS_ENABLED(CONFIG_NET_UDP_TUNNEL)	/* Not in a pernet subsys because need to be available at GRO stage */	struct udp_tunnel_gro udp_tunnel_gro[2];#endif #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;	struct ip_ra_chain __rcu *ra_chain;	struct mutex		ra_mutex;#ifdef CONFIG_IP_MULTIPLE_TABLES	struct fib_rules_ops	*rules_ops;	struct fib_table __rcu	*fib_main;	struct fib_table __rcu	*fib_default;	spinlock_t		fib_table_hash_lock;	unsigned int		fib_rules_require_fldissect;	bool			fib_has_custom_rules;#endif	bool			fib_has_custom_local_routes;	bool			fib_offload_disabled;#ifdef CONFIG_IP_ROUTE_CLASSID	atomic_t		fib_num_tclassid_users;#endif	struct hlist_head	*fib_table_hash;	struct sock		*fibnl;	struct hlist_head	*fib_info_hash;	unsigned int		fib_info_hash_bits;	unsigned int		fib_info_cnt; 	struct sock		*mc_autojoin_sk; 	struct inet_peer_base	*peers;	struct fqdir		*fqdir; 	u8 sysctl_icmp_echo_ignore_all;	u8 sysctl_icmp_echo_enable_probe;	u8 sysctl_icmp_echo_ignore_broadcasts;	u8 sysctl_icmp_ignore_bogus_error_responses;	u8 sysctl_icmp_errors_use_inbound_ifaddr;	u8 sysctl_icmp_errors_extension_mask;	int sysctl_icmp_ratelimit;	int sysctl_icmp_ratemask;	int sysctl_icmp_msgs_per_sec;	int sysctl_icmp_msgs_burst; 	u32 ip_rt_min_pmtu;	int ip_rt_mtu_expires;	int ip_rt_min_advmss; 	struct local_ports ip_local_ports; 	u8 sysctl_tcp_ecn;	u8 sysctl_tcp_ecn_option;	u8 sysctl_tcp_ecn_option_beacon;	u8 sysctl_tcp_ecn_fallback; 	u8 sysctl_ip_default_ttl;	u8 sysctl_ip_no_pmtu_disc;	u8 sysctl_ip_fwd_update_priority;	u8 sysctl_ip_nonlocal_bind;	u8 sysctl_ip_autobind_reuse;	/* Shall we try to damage output packets if routing dev changes? */	u8 sysctl_ip_dynaddr;	u32 sysctl_ip_local_port_step_width;#ifdef CONFIG_NET_L3_MASTER_DEV	u8 sysctl_raw_l3mdev_accept;#endif	u8 sysctl_udp_early_demux; 	u8 sysctl_nexthop_compat_mode; 	u8 sysctl_fwmark_reflect;	u8 sysctl_tcp_fwmark_accept;	u8 sysctl_tcp_mtu_probing;	int sysctl_tcp_mtu_probe_floor;	int sysctl_tcp_base_mss;	int sysctl_tcp_probe_threshold;	u32 sysctl_tcp_probe_interval; 	int sysctl_tcp_keepalive_time;	int sysctl_tcp_keepalive_intvl;	u8 sysctl_tcp_keepalive_probes; 	u8 sysctl_tcp_syn_retries;	u8 sysctl_tcp_synack_retries;	u8 sysctl_tcp_syncookies;	u8 sysctl_tcp_migrate_req;	u8 sysctl_tcp_comp_sack_nr;	u8 sysctl_tcp_backlog_ack_defer;	u8 sysctl_tcp_pingpong_thresh; 	u8 sysctl_tcp_retries1;	u8 sysctl_tcp_retries2;	u8 sysctl_tcp_orphan_retries;	u8 sysctl_tcp_tw_reuse;	unsigned int sysctl_tcp_tw_reuse_delay;	int sysctl_tcp_fin_timeout;	u8 sysctl_tcp_sack;	u8 sysctl_tcp_window_scaling;	u8 sysctl_tcp_timestamps;	int sysctl_tcp_rto_min_us;	int sysctl_tcp_rto_max_ms;	u8 sysctl_tcp_recovery;	u8 sysctl_tcp_thin_linear_timeouts;	u8 sysctl_tcp_slow_start_after_idle;	u8 sysctl_tcp_retrans_collapse;	u8 sysctl_tcp_stdurg;	u8 sysctl_tcp_rfc1337;	u8 sysctl_tcp_abort_on_overflow;	u8 sysctl_tcp_fack; /* obsolete */	int sysctl_tcp_max_reordering;	int sysctl_tcp_adv_win_scale; /* obsolete */	u8 sysctl_tcp_dsack;	u8 sysctl_tcp_app_win;	u8 sysctl_tcp_frto;	u8 sysctl_tcp_nometrics_save;	u8 sysctl_tcp_no_ssthresh_metrics_save;	u8 sysctl_tcp_workaround_signed_windows;	int sysctl_tcp_challenge_ack_limit;	u8 sysctl_tcp_min_tso_segs;	u8 sysctl_tcp_reflect_tos;	int sysctl_tcp_invalid_ratelimit;	int sysctl_tcp_pacing_ss_ratio;	int sysctl_tcp_pacing_ca_ratio;	unsigned int sysctl_tcp_child_ehash_entries;	int sysctl_tcp_comp_sack_rtt_percent;	unsigned long sysctl_tcp_comp_sack_delay_ns;	unsigned long sysctl_tcp_comp_sack_slack_ns;	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;	unsigned int sysctl_tcp_fastopen_blackhole_timeout;	atomic_t tfo_active_disable_times;	unsigned long tfo_active_disable_stamp;	u32 tcp_challenge_timestamp;	u32 tcp_challenge_count;	u8 sysctl_tcp_plb_enabled;	u8 sysctl_tcp_plb_idle_rehash_rounds;	u8 sysctl_tcp_plb_rehash_rounds;	u8 sysctl_tcp_plb_suspend_rto_sec;	int sysctl_tcp_plb_cong_thresh; 	int sysctl_udp_wmem_min;	int sysctl_udp_rmem_min; 	u8 sysctl_fib_notify_on_flag_change;	u8 sysctl_tcp_syn_linear_timeouts; #ifdef CONFIG_NET_L3_MASTER_DEV	u8 sysctl_udp_l3mdev_accept;#endif 	u8 sysctl_igmp_llm_reports;	int sysctl_igmp_max_memberships;	int sysctl_igmp_max_msf;	int sysctl_igmp_qrv; 	struct ping_group_range ping_group_range;	u16			ping_port_rover; 	atomic_t dev_addr_genid; 	unsigned int sysctl_udp_child_hash_entries; #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 __rcu	*mrt;#else	struct list_head	mr_tables;	struct fib_rules_ops	*mr_rules_ops;#endif	struct fib_notifier_ops	*ipmr_notifier_ops;	atomic_t		ipmr_seq;	struct mutex		mfc_mutex;#endif#ifdef CONFIG_IP_ROUTE_MULTIPATH	struct sysctl_fib_multipath_hash_seed sysctl_fib_multipath_hash_seed;	u32 sysctl_fib_multipath_hash_fields;	u8 sysctl_fib_multipath_use_neigh;	u8 sysctl_fib_multipath_hash_policy;#endif 	struct fib_notifier_ops	*notifier_ops;	unsigned int	fib_seq;	/* writes protected by rtnl_mutex */ 	atomic_t	rt_genid;	siphash_key_t	ip_id_key;	struct hlist_head	*inet_addr_lst;	struct delayed_work	addr_chk_work;}; #endif