/* 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_MULTIPATH
struct 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);
        __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;
        unsigned int            fib_rules_require_fldissect;
        bool                    fib_has_custom_rules;
#endif
        bool                    fib_has_custom_local_routes;
        bool                    fib_offload_disabled;
        u8                      sysctl_tcp_shrink_window;
#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;
#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         *mrt;
#else
        struct list_head        mr_tables;
        struct fib_rules_ops    *mr_rules_ops;
#endif
#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 */

        struct fib_notifier_ops *ipmr_notifier_ops;
        unsigned int    ipmr_seq;       /* 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