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
43struct 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

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