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