Linux kernel mirror (for testing)
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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 u8 sysctl_tcp_moderate_rcvbuf;
78 __cacheline_group_end(netns_ipv4_read_txrx);
79
80 /* RX readonly hotpath cache line */
81 __cacheline_group_begin(netns_ipv4_read_rx);
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 __cacheline_group_end(netns_ipv4_read_rx);
89
90 struct inet_timewait_death_row tcp_death_row;
91 struct udp_table *udp_table;
92
93#if IS_ENABLED(CONFIG_NET_UDP_TUNNEL)
94 /* Not in a pernet subsys because need to be available at GRO stage */
95 struct udp_tunnel_gro udp_tunnel_gro[2];
96#endif
97
98#ifdef CONFIG_SYSCTL
99 struct ctl_table_header *forw_hdr;
100 struct ctl_table_header *frags_hdr;
101 struct ctl_table_header *ipv4_hdr;
102 struct ctl_table_header *route_hdr;
103 struct ctl_table_header *xfrm4_hdr;
104#endif
105 struct ipv4_devconf *devconf_all;
106 struct ipv4_devconf *devconf_dflt;
107 struct ip_ra_chain __rcu *ra_chain;
108 struct mutex ra_mutex;
109#ifdef CONFIG_IP_MULTIPLE_TABLES
110 struct fib_rules_ops *rules_ops;
111 struct fib_table __rcu *fib_main;
112 struct fib_table __rcu *fib_default;
113 unsigned int fib_rules_require_fldissect;
114 bool fib_has_custom_rules;
115#endif
116 bool fib_has_custom_local_routes;
117 bool fib_offload_disabled;
118 u8 sysctl_tcp_shrink_window;
119#ifdef CONFIG_IP_ROUTE_CLASSID
120 atomic_t fib_num_tclassid_users;
121#endif
122 struct hlist_head *fib_table_hash;
123 struct sock *fibnl;
124 struct hlist_head *fib_info_hash;
125 unsigned int fib_info_hash_bits;
126 unsigned int fib_info_cnt;
127
128 struct sock *mc_autojoin_sk;
129
130 struct inet_peer_base *peers;
131 struct fqdir *fqdir;
132
133 u8 sysctl_icmp_echo_ignore_all;
134 u8 sysctl_icmp_echo_enable_probe;
135 u8 sysctl_icmp_echo_ignore_broadcasts;
136 u8 sysctl_icmp_ignore_bogus_error_responses;
137 u8 sysctl_icmp_errors_use_inbound_ifaddr;
138 int sysctl_icmp_ratelimit;
139 int sysctl_icmp_ratemask;
140 int sysctl_icmp_msgs_per_sec;
141 int sysctl_icmp_msgs_burst;
142 atomic_t icmp_global_credit;
143 u32 icmp_global_stamp;
144 u32 ip_rt_min_pmtu;
145 int ip_rt_mtu_expires;
146 int ip_rt_min_advmss;
147
148 struct local_ports ip_local_ports;
149
150 u8 sysctl_tcp_ecn;
151 u8 sysctl_tcp_ecn_fallback;
152
153 u8 sysctl_ip_default_ttl;
154 u8 sysctl_ip_no_pmtu_disc;
155 u8 sysctl_ip_fwd_update_priority;
156 u8 sysctl_ip_nonlocal_bind;
157 u8 sysctl_ip_autobind_reuse;
158 /* Shall we try to damage output packets if routing dev changes? */
159 u8 sysctl_ip_dynaddr;
160#ifdef CONFIG_NET_L3_MASTER_DEV
161 u8 sysctl_raw_l3mdev_accept;
162#endif
163 u8 sysctl_udp_early_demux;
164
165 u8 sysctl_nexthop_compat_mode;
166
167 u8 sysctl_fwmark_reflect;
168 u8 sysctl_tcp_fwmark_accept;
169 u8 sysctl_tcp_mtu_probing;
170 int sysctl_tcp_mtu_probe_floor;
171 int sysctl_tcp_base_mss;
172 int sysctl_tcp_probe_threshold;
173 u32 sysctl_tcp_probe_interval;
174
175 int sysctl_tcp_keepalive_time;
176 int sysctl_tcp_keepalive_intvl;
177 u8 sysctl_tcp_keepalive_probes;
178
179 u8 sysctl_tcp_syn_retries;
180 u8 sysctl_tcp_synack_retries;
181 u8 sysctl_tcp_syncookies;
182 u8 sysctl_tcp_migrate_req;
183 u8 sysctl_tcp_comp_sack_nr;
184 u8 sysctl_tcp_backlog_ack_defer;
185 u8 sysctl_tcp_pingpong_thresh;
186
187 u8 sysctl_tcp_retries1;
188 u8 sysctl_tcp_retries2;
189 u8 sysctl_tcp_orphan_retries;
190 u8 sysctl_tcp_tw_reuse;
191 unsigned int sysctl_tcp_tw_reuse_delay;
192 int sysctl_tcp_fin_timeout;
193 u8 sysctl_tcp_sack;
194 u8 sysctl_tcp_window_scaling;
195 u8 sysctl_tcp_timestamps;
196 int sysctl_tcp_rto_min_us;
197 int sysctl_tcp_rto_max_ms;
198 u8 sysctl_tcp_recovery;
199 u8 sysctl_tcp_thin_linear_timeouts;
200 u8 sysctl_tcp_slow_start_after_idle;
201 u8 sysctl_tcp_retrans_collapse;
202 u8 sysctl_tcp_stdurg;
203 u8 sysctl_tcp_rfc1337;
204 u8 sysctl_tcp_abort_on_overflow;
205 u8 sysctl_tcp_fack; /* obsolete */
206 int sysctl_tcp_max_reordering;
207 int sysctl_tcp_adv_win_scale; /* obsolete */
208 u8 sysctl_tcp_dsack;
209 u8 sysctl_tcp_app_win;
210 u8 sysctl_tcp_frto;
211 u8 sysctl_tcp_nometrics_save;
212 u8 sysctl_tcp_no_ssthresh_metrics_save;
213 u8 sysctl_tcp_workaround_signed_windows;
214 int sysctl_tcp_challenge_ack_limit;
215 u8 sysctl_tcp_min_tso_segs;
216 u8 sysctl_tcp_reflect_tos;
217 int sysctl_tcp_invalid_ratelimit;
218 int sysctl_tcp_pacing_ss_ratio;
219 int sysctl_tcp_pacing_ca_ratio;
220 unsigned int sysctl_tcp_child_ehash_entries;
221 unsigned long sysctl_tcp_comp_sack_delay_ns;
222 unsigned long sysctl_tcp_comp_sack_slack_ns;
223 int sysctl_max_syn_backlog;
224 int sysctl_tcp_fastopen;
225 const struct tcp_congestion_ops __rcu *tcp_congestion_control;
226 struct tcp_fastopen_context __rcu *tcp_fastopen_ctx;
227 unsigned int sysctl_tcp_fastopen_blackhole_timeout;
228 atomic_t tfo_active_disable_times;
229 unsigned long tfo_active_disable_stamp;
230 u32 tcp_challenge_timestamp;
231 u32 tcp_challenge_count;
232 u8 sysctl_tcp_plb_enabled;
233 u8 sysctl_tcp_plb_idle_rehash_rounds;
234 u8 sysctl_tcp_plb_rehash_rounds;
235 u8 sysctl_tcp_plb_suspend_rto_sec;
236 int sysctl_tcp_plb_cong_thresh;
237
238 int sysctl_udp_wmem_min;
239 int sysctl_udp_rmem_min;
240
241 u8 sysctl_fib_notify_on_flag_change;
242 u8 sysctl_tcp_syn_linear_timeouts;
243
244#ifdef CONFIG_NET_L3_MASTER_DEV
245 u8 sysctl_udp_l3mdev_accept;
246#endif
247
248 u8 sysctl_igmp_llm_reports;
249 int sysctl_igmp_max_memberships;
250 int sysctl_igmp_max_msf;
251 int sysctl_igmp_qrv;
252
253 struct ping_group_range ping_group_range;
254
255 atomic_t dev_addr_genid;
256
257 unsigned int sysctl_udp_child_hash_entries;
258
259#ifdef CONFIG_SYSCTL
260 unsigned long *sysctl_local_reserved_ports;
261 int sysctl_ip_prot_sock;
262#endif
263
264#ifdef CONFIG_IP_MROUTE
265#ifndef CONFIG_IP_MROUTE_MULTIPLE_TABLES
266 struct mr_table *mrt;
267#else
268 struct list_head mr_tables;
269 struct fib_rules_ops *mr_rules_ops;
270#endif
271#endif
272#ifdef CONFIG_IP_ROUTE_MULTIPATH
273 struct sysctl_fib_multipath_hash_seed sysctl_fib_multipath_hash_seed;
274 u32 sysctl_fib_multipath_hash_fields;
275 u8 sysctl_fib_multipath_use_neigh;
276 u8 sysctl_fib_multipath_hash_policy;
277#endif
278
279 struct fib_notifier_ops *notifier_ops;
280 unsigned int fib_seq; /* writes protected by rtnl_mutex */
281
282 struct fib_notifier_ops *ipmr_notifier_ops;
283 unsigned int ipmr_seq; /* protected by rtnl_mutex */
284
285 atomic_t rt_genid;
286 siphash_key_t ip_id_key;
287 struct hlist_head *inet_addr_lst;
288 struct delayed_work addr_chk_work;
289};
290
291#endif