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
15struct ctl_table_header;
16struct ipv4_devconf;
17struct fib_rules_ops;
18struct hlist_head;
19struct fib_table;
20struct sock;
21struct local_ports {
22 u32 range; /* high << 16 | low */
23 bool warned;
24};
25
26struct ping_group_range {
27 seqlock_t lock;
28 kgid_t range[2];
29};
30
31struct inet_hashinfo;
32
33struct 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
41struct tcp_fastopen_context;
42
43#ifdef CONFIG_IP_ROUTE_MULTIPATH
44struct sysctl_fib_multipath_hash_seed {
45 u32 user_seed;
46 u32 mp_seed;
47};
48#endif
49
50struct udp_tunnel_gro {
51 struct sock __rcu *sk;
52 struct hlist_head list;
53};
54
55struct netns_ipv4 {
56 /* Cacheline organization can be found documented in
57 * Documentation/networking/net_cachelines/netns_ipv4_sysctl.rst.
58 * Please update the document when adding new fields.
59 */
60
61 /* TX readonly hotpath cache lines */
62 __cacheline_group_begin(netns_ipv4_read_tx);
63 u8 sysctl_tcp_early_retrans;
64 u8 sysctl_tcp_tso_win_divisor;
65 u8 sysctl_tcp_tso_rtt_log;
66 u8 sysctl_tcp_autocorking;
67 int sysctl_tcp_min_snd_mss;
68 unsigned int sysctl_tcp_notsent_lowat;
69 int sysctl_tcp_limit_output_bytes;
70 int sysctl_tcp_min_rtt_wlen;
71 int sysctl_tcp_wmem[3];
72 u8 sysctl_ip_fwd_use_pmtu;
73 __cacheline_group_end(netns_ipv4_read_tx);
74
75 /* TXRX readonly hotpath cache lines */
76 __cacheline_group_begin(netns_ipv4_read_txrx);
77 __cacheline_group_end(netns_ipv4_read_txrx);
78
79 /* RX readonly hotpath cache line */
80 __cacheline_group_begin(netns_ipv4_read_rx);
81 u8 sysctl_tcp_moderate_rcvbuf;
82 u8 sysctl_ip_early_demux;
83 u8 sysctl_tcp_early_demux;
84 u8 sysctl_tcp_l3mdev_accept;
85 /* 3 bytes hole, try to pack */
86 int sysctl_tcp_reordering;
87 int sysctl_tcp_rmem[3];
88 int sysctl_tcp_rcvbuf_low_rtt;
89 __cacheline_group_end(netns_ipv4_read_rx);
90
91 struct inet_timewait_death_row tcp_death_row;
92 struct udp_table *udp_table;
93
94#if IS_ENABLED(CONFIG_NET_UDP_TUNNEL)
95 /* Not in a pernet subsys because need to be available at GRO stage */
96 struct udp_tunnel_gro udp_tunnel_gro[2];
97#endif
98
99#ifdef CONFIG_SYSCTL
100 struct ctl_table_header *forw_hdr;
101 struct ctl_table_header *frags_hdr;
102 struct ctl_table_header *ipv4_hdr;
103 struct ctl_table_header *route_hdr;
104 struct ctl_table_header *xfrm4_hdr;
105#endif
106 struct ipv4_devconf *devconf_all;
107 struct ipv4_devconf *devconf_dflt;
108 struct ip_ra_chain __rcu *ra_chain;
109 struct mutex ra_mutex;
110#ifdef CONFIG_IP_MULTIPLE_TABLES
111 struct fib_rules_ops *rules_ops;
112 struct fib_table __rcu *fib_main;
113 struct fib_table __rcu *fib_default;
114 unsigned int fib_rules_require_fldissect;
115 bool fib_has_custom_rules;
116#endif
117 bool fib_has_custom_local_routes;
118 bool fib_offload_disabled;
119 u8 sysctl_tcp_shrink_window;
120#ifdef CONFIG_IP_ROUTE_CLASSID
121 atomic_t fib_num_tclassid_users;
122#endif
123 struct hlist_head *fib_table_hash;
124 struct sock *fibnl;
125 struct hlist_head *fib_info_hash;
126 unsigned int fib_info_hash_bits;
127 unsigned int fib_info_cnt;
128
129 struct sock *mc_autojoin_sk;
130
131 struct inet_peer_base *peers;
132 struct fqdir *fqdir;
133
134 u8 sysctl_icmp_echo_ignore_all;
135 u8 sysctl_icmp_echo_enable_probe;
136 u8 sysctl_icmp_echo_ignore_broadcasts;
137 u8 sysctl_icmp_ignore_bogus_error_responses;
138 u8 sysctl_icmp_errors_use_inbound_ifaddr;
139 u8 sysctl_icmp_errors_extension_mask;
140 int sysctl_icmp_ratelimit;
141 int sysctl_icmp_ratemask;
142 int sysctl_icmp_msgs_per_sec;
143 int sysctl_icmp_msgs_burst;
144 atomic_t icmp_global_credit;
145 u32 icmp_global_stamp;
146 u32 ip_rt_min_pmtu;
147 int ip_rt_mtu_expires;
148 int ip_rt_min_advmss;
149
150 struct local_ports ip_local_ports;
151
152 u8 sysctl_tcp_ecn;
153 u8 sysctl_tcp_ecn_option;
154 u8 sysctl_tcp_ecn_option_beacon;
155 u8 sysctl_tcp_ecn_fallback;
156
157 u8 sysctl_ip_default_ttl;
158 u8 sysctl_ip_no_pmtu_disc;
159 u8 sysctl_ip_fwd_update_priority;
160 u8 sysctl_ip_nonlocal_bind;
161 u8 sysctl_ip_autobind_reuse;
162 /* Shall we try to damage output packets if routing dev changes? */
163 u8 sysctl_ip_dynaddr;
164#ifdef CONFIG_NET_L3_MASTER_DEV
165 u8 sysctl_raw_l3mdev_accept;
166#endif
167 u8 sysctl_udp_early_demux;
168
169 u8 sysctl_nexthop_compat_mode;
170
171 u8 sysctl_fwmark_reflect;
172 u8 sysctl_tcp_fwmark_accept;
173 u8 sysctl_tcp_mtu_probing;
174 int sysctl_tcp_mtu_probe_floor;
175 int sysctl_tcp_base_mss;
176 int sysctl_tcp_probe_threshold;
177 u32 sysctl_tcp_probe_interval;
178
179 int sysctl_tcp_keepalive_time;
180 int sysctl_tcp_keepalive_intvl;
181 u8 sysctl_tcp_keepalive_probes;
182
183 u8 sysctl_tcp_syn_retries;
184 u8 sysctl_tcp_synack_retries;
185 u8 sysctl_tcp_syncookies;
186 u8 sysctl_tcp_migrate_req;
187 u8 sysctl_tcp_comp_sack_nr;
188 u8 sysctl_tcp_backlog_ack_defer;
189 u8 sysctl_tcp_pingpong_thresh;
190
191 u8 sysctl_tcp_retries1;
192 u8 sysctl_tcp_retries2;
193 u8 sysctl_tcp_orphan_retries;
194 u8 sysctl_tcp_tw_reuse;
195 unsigned int sysctl_tcp_tw_reuse_delay;
196 int sysctl_tcp_fin_timeout;
197 u8 sysctl_tcp_sack;
198 u8 sysctl_tcp_window_scaling;
199 u8 sysctl_tcp_timestamps;
200 int sysctl_tcp_rto_min_us;
201 int sysctl_tcp_rto_max_ms;
202 u8 sysctl_tcp_recovery;
203 u8 sysctl_tcp_thin_linear_timeouts;
204 u8 sysctl_tcp_slow_start_after_idle;
205 u8 sysctl_tcp_retrans_collapse;
206 u8 sysctl_tcp_stdurg;
207 u8 sysctl_tcp_rfc1337;
208 u8 sysctl_tcp_abort_on_overflow;
209 u8 sysctl_tcp_fack; /* obsolete */
210 int sysctl_tcp_max_reordering;
211 int sysctl_tcp_adv_win_scale; /* obsolete */
212 u8 sysctl_tcp_dsack;
213 u8 sysctl_tcp_app_win;
214 u8 sysctl_tcp_frto;
215 u8 sysctl_tcp_nometrics_save;
216 u8 sysctl_tcp_no_ssthresh_metrics_save;
217 u8 sysctl_tcp_workaround_signed_windows;
218 int sysctl_tcp_challenge_ack_limit;
219 u8 sysctl_tcp_min_tso_segs;
220 u8 sysctl_tcp_reflect_tos;
221 int sysctl_tcp_invalid_ratelimit;
222 int sysctl_tcp_pacing_ss_ratio;
223 int sysctl_tcp_pacing_ca_ratio;
224 unsigned int sysctl_tcp_child_ehash_entries;
225 int sysctl_tcp_comp_sack_rtt_percent;
226 unsigned long sysctl_tcp_comp_sack_delay_ns;
227 unsigned long sysctl_tcp_comp_sack_slack_ns;
228 int sysctl_max_syn_backlog;
229 int sysctl_tcp_fastopen;
230 const struct tcp_congestion_ops __rcu *tcp_congestion_control;
231 struct tcp_fastopen_context __rcu *tcp_fastopen_ctx;
232 unsigned int sysctl_tcp_fastopen_blackhole_timeout;
233 atomic_t tfo_active_disable_times;
234 unsigned long tfo_active_disable_stamp;
235 u32 tcp_challenge_timestamp;
236 u32 tcp_challenge_count;
237 u8 sysctl_tcp_plb_enabled;
238 u8 sysctl_tcp_plb_idle_rehash_rounds;
239 u8 sysctl_tcp_plb_rehash_rounds;
240 u8 sysctl_tcp_plb_suspend_rto_sec;
241 int sysctl_tcp_plb_cong_thresh;
242
243 int sysctl_udp_wmem_min;
244 int sysctl_udp_rmem_min;
245
246 u8 sysctl_fib_notify_on_flag_change;
247 u8 sysctl_tcp_syn_linear_timeouts;
248
249#ifdef CONFIG_NET_L3_MASTER_DEV
250 u8 sysctl_udp_l3mdev_accept;
251#endif
252
253 u8 sysctl_igmp_llm_reports;
254 int sysctl_igmp_max_memberships;
255 int sysctl_igmp_max_msf;
256 int sysctl_igmp_qrv;
257
258 struct ping_group_range ping_group_range;
259 u16 ping_port_rover;
260
261 atomic_t dev_addr_genid;
262
263 unsigned int sysctl_udp_child_hash_entries;
264
265#ifdef CONFIG_SYSCTL
266 unsigned long *sysctl_local_reserved_ports;
267 int sysctl_ip_prot_sock;
268#endif
269
270#ifdef CONFIG_IP_MROUTE
271#ifndef CONFIG_IP_MROUTE_MULTIPLE_TABLES
272 struct mr_table *mrt;
273#else
274 struct list_head mr_tables;
275 struct fib_rules_ops *mr_rules_ops;
276#endif
277#endif
278#ifdef CONFIG_IP_ROUTE_MULTIPATH
279 struct sysctl_fib_multipath_hash_seed sysctl_fib_multipath_hash_seed;
280 u32 sysctl_fib_multipath_hash_fields;
281 u8 sysctl_fib_multipath_use_neigh;
282 u8 sysctl_fib_multipath_hash_policy;
283#endif
284
285 struct fib_notifier_ops *notifier_ops;
286 unsigned int fib_seq; /* writes protected by rtnl_mutex */
287
288 struct fib_notifier_ops *ipmr_notifier_ops;
289 unsigned int ipmr_seq; /* protected by rtnl_mutex */
290
291 atomic_t rt_genid;
292 siphash_key_t ip_id_key;
293 struct hlist_head *inet_addr_lst;
294 struct delayed_work addr_chk_work;
295};
296
297#endif
298

source code of linux/include/net/netns/ipv4.h