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