include/net/netns/ipv4.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * ipv4 in net namespaces
   4  */
   5
   6 #ifndef __NETNS_IPV4_H__
   7 #define __NETNS_IPV4_H__
   8
   9 #include <linux/uidgid.h>
  10 #include <net/inet_frag.h>
  11 #include <linux/rcupdate.h>
  12 #include <linux/seqlock.h>
  13 #include <linux/siphash.h>
  14
  15 struct ctl_table_header;
  16 struct ipv4_devconf;
  17 struct fib_rules_ops;
  18 struct hlist_head;
  19 struct fib_table;
  20 struct sock;
  21 struct local_ports {
  22         u32             range;  /* high << 16 | low */
  23         bool            warned;
  24 };
  25
  26 struct ping_group_range {
  27         seqlock_t       lock;
  28         kgid_t          range[2];
  29 };
  30
  31 struct inet_hashinfo;
  32
  33 struct inet_timewait_death_row {
  34         refcount_t              tw_refcount;
  35
  36         /* Padding to avoid false sharing, tw_refcount can be often written */
  37         struct inet_hashinfo    *hashinfo ____cacheline_aligned_in_smp;
  38         int                     sysctl_max_tw_buckets;
  39 };
  40
  41 struct tcp_fastopen_context;
  42
  43 #ifdef CONFIG_IP_ROUTE_MULTIPATH
  44 struct sysctl_fib_multipath_hash_seed {
  45         u32 user_seed;
  46         u32 mp_seed;
  47 };
  48 #endif
  49
  50 struct netns_ipv4 {
  51         /* Cacheline organization can be found documented in
  52          * Documentation/networking/net_cachelines/netns_ipv4_sysctl.rst.
  53          * Please update the document when adding new fields.
  54          */
  55
  56         /* TX readonly hotpath cache lines */
  57         __cacheline_group_begin(netns_ipv4_read_tx);
  58         u8 sysctl_tcp_early_retrans;
  59         u8 sysctl_tcp_tso_win_divisor;
  60         u8 sysctl_tcp_tso_rtt_log;
  61         u8 sysctl_tcp_autocorking;
  62         int sysctl_tcp_min_snd_mss;
  63         unsigned int sysctl_tcp_notsent_lowat;
  64         int sysctl_tcp_limit_output_bytes;
  65         int sysctl_tcp_min_rtt_wlen;
  66         int sysctl_tcp_wmem[3];
  67         u8 sysctl_ip_fwd_use_pmtu;
  68         __cacheline_group_end(netns_ipv4_read_tx);
  69
  70         /* TXRX readonly hotpath cache lines */
  71         __cacheline_group_begin(netns_ipv4_read_txrx);
  72         u8 sysctl_tcp_moderate_rcvbuf;
  73         __cacheline_group_end(netns_ipv4_read_txrx);
  74
  75         /* RX readonly hotpath cache line */
  76         __cacheline_group_begin(netns_ipv4_read_rx);
  77         u8 sysctl_ip_early_demux;
  78         u8 sysctl_tcp_early_demux;
  79         u8 sysctl_tcp_l3mdev_accept;
  80         /* 3 bytes hole, try to pack */
  81         int sysctl_tcp_reordering;
  82         int sysctl_tcp_rmem[3];
  83         __cacheline_group_end(netns_ipv4_read_rx);
  84
  85         struct inet_timewait_death_row tcp_death_row;
  86         struct udp_table *udp_table;
  87
  88 #ifdef CONFIG_SYSCTL
  89         struct ctl_table_header *forw_hdr;
  90         struct ctl_table_header *frags_hdr;
  91         struct ctl_table_header *ipv4_hdr;
  92         struct ctl_table_header *route_hdr;
  93         struct ctl_table_header *xfrm4_hdr;
  94 #endif
  95         struct ipv4_devconf     *devconf_all;
  96         struct ipv4_devconf     *devconf_dflt;
  97         struct ip_ra_chain __rcu *ra_chain;
  98         struct mutex            ra_mutex;
  99 #ifdef CONFIG_IP_MULTIPLE_TABLES
 100         struct fib_rules_ops    *rules_ops;
 101         struct fib_table __rcu  *fib_main;
 102         struct fib_table __rcu  *fib_default;
 103         unsigned int            fib_rules_require_fldissect;
 104         bool                    fib_has_custom_rules;
 105 #endif
 106         bool                    fib_has_custom_local_routes;
 107         bool                    fib_offload_disabled;
 108         u8                      sysctl_tcp_shrink_window;
 109 #ifdef CONFIG_IP_ROUTE_CLASSID
 110         atomic_t                fib_num_tclassid_users;
 111 #endif
 112         struct hlist_head       *fib_table_hash;
 113         struct sock             *fibnl;
 114
 115         struct sock             *mc_autojoin_sk;
 116
 117         struct inet_peer_base   *peers;
 118         struct fqdir            *fqdir;
 119
 120         u8 sysctl_icmp_echo_ignore_all;
 121         u8 sysctl_icmp_echo_enable_probe;
 122         u8 sysctl_icmp_echo_ignore_broadcasts;
 123         u8 sysctl_icmp_ignore_bogus_error_responses;
 124         u8 sysctl_icmp_errors_use_inbound_ifaddr;
 125         int sysctl_icmp_ratelimit;
 126         int sysctl_icmp_ratemask;
 127         int sysctl_icmp_msgs_per_sec;
 128         int sysctl_icmp_msgs_burst;
 129         atomic_t icmp_global_credit;
 130         u32 icmp_global_stamp;
 131         u32 ip_rt_min_pmtu;
 132         int ip_rt_mtu_expires;
 133         int ip_rt_min_advmss;
 134
 135         struct local_ports ip_local_ports;
 136
 137         u8 sysctl_tcp_ecn;
 138         u8 sysctl_tcp_ecn_fallback;
 139
 140         u8 sysctl_ip_default_ttl;
 141         u8 sysctl_ip_no_pmtu_disc;
 142         u8 sysctl_ip_fwd_update_priority;
 143         u8 sysctl_ip_nonlocal_bind;
 144         u8 sysctl_ip_autobind_reuse;
 145         /* Shall we try to damage output packets if routing dev changes? */
 146         u8 sysctl_ip_dynaddr;
 147 #ifdef CONFIG_NET_L3_MASTER_DEV
 148         u8 sysctl_raw_l3mdev_accept;
 149 #endif
 150         u8 sysctl_udp_early_demux;
 151
 152         u8 sysctl_nexthop_compat_mode;
 153
 154         u8 sysctl_fwmark_reflect;
 155         u8 sysctl_tcp_fwmark_accept;
 156         u8 sysctl_tcp_mtu_probing;
 157         int sysctl_tcp_mtu_probe_floor;
 158         int sysctl_tcp_base_mss;
 159         int sysctl_tcp_probe_threshold;
 160         u32 sysctl_tcp_probe_interval;
 161
 162         int sysctl_tcp_keepalive_time;
 163         int sysctl_tcp_keepalive_intvl;
 164         u8 sysctl_tcp_keepalive_probes;
 165
 166         u8 sysctl_tcp_syn_retries;
 167         u8 sysctl_tcp_synack_retries;
 168         u8 sysctl_tcp_syncookies;
 169         u8 sysctl_tcp_migrate_req;
 170         u8 sysctl_tcp_comp_sack_nr;
 171         u8 sysctl_tcp_backlog_ack_defer;
 172         u8 sysctl_tcp_pingpong_thresh;
 173
 174         u8 sysctl_tcp_retries1;
 175         u8 sysctl_tcp_retries2;
 176         u8 sysctl_tcp_orphan_retries;
 177         u8 sysctl_tcp_tw_reuse;
 178         int sysctl_tcp_fin_timeout;
 179         u8 sysctl_tcp_sack;
 180         u8 sysctl_tcp_window_scaling;
 181         u8 sysctl_tcp_timestamps;
 182         int sysctl_tcp_rto_min_us;
 183         u8 sysctl_tcp_recovery;
 184         u8 sysctl_tcp_thin_linear_timeouts;
 185         u8 sysctl_tcp_slow_start_after_idle;
 186         u8 sysctl_tcp_retrans_collapse;
 187         u8 sysctl_tcp_stdurg;
 188         u8 sysctl_tcp_rfc1337;
 189         u8 sysctl_tcp_abort_on_overflow;
 190         u8 sysctl_tcp_fack; /* obsolete */
 191         int sysctl_tcp_max_reordering;
 192         int sysctl_tcp_adv_win_scale; /* obsolete */
 193         u8 sysctl_tcp_dsack;
 194         u8 sysctl_tcp_app_win;
 195         u8 sysctl_tcp_frto;
 196         u8 sysctl_tcp_nometrics_save;
 197         u8 sysctl_tcp_no_ssthresh_metrics_save;
 198         u8 sysctl_tcp_workaround_signed_windows;
 199         int sysctl_tcp_challenge_ack_limit;
 200         u8 sysctl_tcp_min_tso_segs;
 201         u8 sysctl_tcp_reflect_tos;
 202         int sysctl_tcp_invalid_ratelimit;
 203         int sysctl_tcp_pacing_ss_ratio;
 204         int sysctl_tcp_pacing_ca_ratio;
 205         unsigned int sysctl_tcp_child_ehash_entries;
 206         unsigned long sysctl_tcp_comp_sack_delay_ns;
 207         unsigned long sysctl_tcp_comp_sack_slack_ns;
 208         int sysctl_max_syn_backlog;
 209         int sysctl_tcp_fastopen;
 210         const struct tcp_congestion_ops __rcu  *tcp_congestion_control;
 211         struct tcp_fastopen_context __rcu *tcp_fastopen_ctx;
 212         unsigned int sysctl_tcp_fastopen_blackhole_timeout;
 213         atomic_t tfo_active_disable_times;
 214         unsigned long tfo_active_disable_stamp;
 215         u32 tcp_challenge_timestamp;
 216         u32 tcp_challenge_count;
 217         u8 sysctl_tcp_plb_enabled;
 218         u8 sysctl_tcp_plb_idle_rehash_rounds;
 219         u8 sysctl_tcp_plb_rehash_rounds;
 220         u8 sysctl_tcp_plb_suspend_rto_sec;
 221         int sysctl_tcp_plb_cong_thresh;
 222
 223         int sysctl_udp_wmem_min;
 224         int sysctl_udp_rmem_min;
 225
 226         u8 sysctl_fib_notify_on_flag_change;
 227         u8 sysctl_tcp_syn_linear_timeouts;
 228
 229 #ifdef CONFIG_NET_L3_MASTER_DEV
 230         u8 sysctl_udp_l3mdev_accept;
 231 #endif
 232
 233         u8 sysctl_igmp_llm_reports;
 234         int sysctl_igmp_max_memberships;
 235         int sysctl_igmp_max_msf;
 236         int sysctl_igmp_qrv;
 237
 238         struct ping_group_range ping_group_range;
 239
 240         atomic_t dev_addr_genid;
 241
 242         unsigned int sysctl_udp_child_hash_entries;
 243
 244 #ifdef CONFIG_SYSCTL
 245         unsigned long *sysctl_local_reserved_ports;
 246         int sysctl_ip_prot_sock;
 247 #endif
 248
 249 #ifdef CONFIG_IP_MROUTE
 250 #ifndef CONFIG_IP_MROUTE_MULTIPLE_TABLES
 251         struct mr_table         *mrt;
 252 #else
 253         struct list_head        mr_tables;
 254         struct fib_rules_ops    *mr_rules_ops;
 255 #endif
 256 #endif
 257 #ifdef CONFIG_IP_ROUTE_MULTIPATH
 258         struct sysctl_fib_multipath_hash_seed sysctl_fib_multipath_hash_seed;
 259         u32 sysctl_fib_multipath_hash_fields;
 260         u8 sysctl_fib_multipath_use_neigh;
 261         u8 sysctl_fib_multipath_hash_policy;
 262 #endif
 263
 264         struct fib_notifier_ops *notifier_ops;
 265         unsigned int    fib_seq;        /* writes protected by rtnl_mutex */
 266
 267         struct fib_notifier_ops *ipmr_notifier_ops;
 268         unsigned int    ipmr_seq;       /* protected by rtnl_mutex */
 269
 270         atomic_t        rt_genid;
 271         siphash_key_t   ip_id_key;
 272         struct hlist_head       *inet_addr_lst;
 273         struct delayed_work     addr_chk_work;
 274 };
 275 #endif