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 #ifdef CONFIG_IP_ROUTE_MULTIPATH
44 struct sysctl_fib_multipath_hash_seed {
45 u32 user_seed;
46 u32 mp_seed;
47 };
48 #endif
49
50 struct netns_ipv4 {
51 /* Cacheline organization can be found documented in
52 * Documentation/networking/net_cachelines/netns_ipv4_sysctl.rst.
53 * Please update the document when adding new fields.
54 */
55
56 /* TX readonly hotpath cache lines */
57 __cacheline_group_begin(netns_ipv4_read_tx);
58 u8 sysctl_tcp_early_retrans;
59 u8 sysctl_tcp_tso_win_divisor;
60 u8 sysctl_tcp_tso_rtt_log;
61 u8 sysctl_tcp_autocorking;
62 int sysctl_tcp_min_snd_mss;
63 unsigned int sysctl_tcp_notsent_lowat;
64 int sysctl_tcp_limit_output_bytes;
65 int sysctl_tcp_min_rtt_wlen;
66 int sysctl_tcp_wmem[3];
67 u8 sysctl_ip_fwd_use_pmtu;
68 __cacheline_group_end(netns_ipv4_read_tx);
69
70 /* TXRX readonly hotpath cache lines */
71 __cacheline_group_begin(netns_ipv4_read_txrx);
72 u8 sysctl_tcp_moderate_rcvbuf;
73 __cacheline_group_end(netns_ipv4_read_txrx);
74
75 /* RX readonly hotpath cache line */
76 __cacheline_group_begin(netns_ipv4_read_rx);
77 u8 sysctl_ip_early_demux;
78 u8 sysctl_tcp_early_demux;
79 int sysctl_tcp_reordering;
80 int sysctl_tcp_rmem[3];
81 __cacheline_group_end(netns_ipv4_read_rx);
82
83 struct inet_timewait_death_row tcp_death_row;
84 struct udp_table *udp_table;
85
86 #ifdef CONFIG_SYSCTL
87 struct ctl_table_header *forw_hdr;
88 struct ctl_table_header *frags_hdr;
89 struct ctl_table_header *ipv4_hdr;
90 struct ctl_table_header *route_hdr;
91 struct ctl_table_header *xfrm4_hdr;
92 #endif
93 struct ipv4_devconf *devconf_all;
94 struct ipv4_devconf *devconf_dflt;
95 struct ip_ra_chain __rcu *ra_chain;
96 struct mutex ra_mutex;
97 #ifdef CONFIG_IP_MULTIPLE_TABLES
98 struct fib_rules_ops *rules_ops;
99 struct fib_table __rcu *fib_main;
100 struct fib_table __rcu *fib_default;
101 unsigned int fib_rules_require_fldissect;
102 bool fib_has_custom_rules;
103 #endif
104 bool fib_has_custom_local_routes;
105 bool fib_offload_disabled;
106 u8 sysctl_tcp_shrink_window;
107 #ifdef CONFIG_IP_ROUTE_CLASSID
108 atomic_t fib_num_tclassid_users;
109 #endif
110 struct hlist_head *fib_table_hash;
111 struct sock *fibnl;
112
113 struct sock *mc_autojoin_sk;
114
115 struct inet_peer_base *peers;
116 struct fqdir *fqdir;
117
118 u8 sysctl_icmp_echo_ignore_all;
119 u8 sysctl_icmp_echo_enable_probe;
120 u8 sysctl_icmp_echo_ignore_broadcasts;
121 u8 sysctl_icmp_ignore_bogus_error_responses;
122 u8 sysctl_icmp_errors_use_inbound_ifaddr;
123 int sysctl_icmp_ratelimit;
124 int sysctl_icmp_ratemask;
125
126 u32 ip_rt_min_pmtu;
127 int ip_rt_mtu_expires;
128 int ip_rt_min_advmss;
129
130 struct local_ports ip_local_ports;
131
132 u8 sysctl_tcp_ecn;
133 u8 sysctl_tcp_ecn_fallback;
134
135 u8 sysctl_ip_default_ttl;
136 u8 sysctl_ip_no_pmtu_disc;
137 u8 sysctl_ip_fwd_update_priority;
138 u8 sysctl_ip_nonlocal_bind;
139 u8 sysctl_ip_autobind_reuse;
140 /* Shall we try to damage output packets if routing dev changes? */
141 u8 sysctl_ip_dynaddr;
142 #ifdef CONFIG_NET_L3_MASTER_DEV
143 u8 sysctl_raw_l3mdev_accept;
144 #endif
145 u8 sysctl_udp_early_demux;
146
147 u8 sysctl_nexthop_compat_mode;
148
149 u8 sysctl_fwmark_reflect;
150 u8 sysctl_tcp_fwmark_accept;
151 #ifdef CONFIG_NET_L3_MASTER_DEV
152 u8 sysctl_tcp_l3mdev_accept;
153 #endif
154 u8 sysctl_tcp_mtu_probing;
155 int sysctl_tcp_mtu_probe_floor;
156 int sysctl_tcp_base_mss;
157 int sysctl_tcp_probe_threshold;
158 u32 sysctl_tcp_probe_interval;
159
160 int sysctl_tcp_keepalive_time;
161 int sysctl_tcp_keepalive_intvl;
162 u8 sysctl_tcp_keepalive_probes;
163
164 u8 sysctl_tcp_syn_retries;
165 u8 sysctl_tcp_synack_retries;
166 u8 sysctl_tcp_syncookies;
167 u8 sysctl_tcp_migrate_req;
168 u8 sysctl_tcp_comp_sack_nr;
169 u8 sysctl_tcp_backlog_ack_defer;
170 u8 sysctl_tcp_pingpong_thresh;
171
172 u8 sysctl_tcp_retries1;
173 u8 sysctl_tcp_retries2;
174 u8 sysctl_tcp_orphan_retries;
175 u8 sysctl_tcp_tw_reuse;
176 int sysctl_tcp_fin_timeout;
177 u8 sysctl_tcp_sack;
178 u8 sysctl_tcp_window_scaling;
179 u8 sysctl_tcp_timestamps;
180 int sysctl_tcp_rto_min_us;
181 u8 sysctl_tcp_recovery;
182 u8 sysctl_tcp_thin_linear_timeouts;
183 u8 sysctl_tcp_slow_start_after_idle;
184 u8 sysctl_tcp_retrans_collapse;
185 u8 sysctl_tcp_stdurg;
186 u8 sysctl_tcp_rfc1337;
187 u8 sysctl_tcp_abort_on_overflow;
188 u8 sysctl_tcp_fack; /* obsolete */
189 int sysctl_tcp_max_reordering;
190 int sysctl_tcp_adv_win_scale; /* obsolete */
191 u8 sysctl_tcp_dsack;
192 u8 sysctl_tcp_app_win;
193 u8 sysctl_tcp_frto;
194 u8 sysctl_tcp_nometrics_save;
195 u8 sysctl_tcp_no_ssthresh_metrics_save;
196 u8 sysctl_tcp_workaround_signed_windows;
197 int sysctl_tcp_challenge_ack_limit;
198 u8 sysctl_tcp_min_tso_segs;
199 u8 sysctl_tcp_reflect_tos;
200 int sysctl_tcp_invalid_ratelimit;
201 int sysctl_tcp_pacing_ss_ratio;
202 int sysctl_tcp_pacing_ca_ratio;
203 unsigned int sysctl_tcp_child_ehash_entries;
204 unsigned long sysctl_tcp_comp_sack_delay_ns;
205 unsigned long sysctl_tcp_comp_sack_slack_ns;
206 int sysctl_max_syn_backlog;
207 int sysctl_tcp_fastopen;
208 const struct tcp_congestion_ops __rcu *tcp_congestion_control;
209 struct tcp_fastopen_context __rcu *tcp_fastopen_ctx;
210 unsigned int sysctl_tcp_fastopen_blackhole_timeout;
211 atomic_t tfo_active_disable_times;
212 unsigned long tfo_active_disable_stamp;
213 u32 tcp_challenge_timestamp;
214 u32 tcp_challenge_count;
215 u8 sysctl_tcp_plb_enabled;
216 u8 sysctl_tcp_plb_idle_rehash_rounds;
217 u8 sysctl_tcp_plb_rehash_rounds;
218 u8 sysctl_tcp_plb_suspend_rto_sec;
219 int sysctl_tcp_plb_cong_thresh;
220
221 int sysctl_udp_wmem_min;
222 int sysctl_udp_rmem_min;
223
224 u8 sysctl_fib_notify_on_flag_change;
225 u8 sysctl_tcp_syn_linear_timeouts;
226
227 #ifdef CONFIG_NET_L3_MASTER_DEV
228 u8 sysctl_udp_l3mdev_accept;
229 #endif
230
231 u8 sysctl_igmp_llm_reports;
232 int sysctl_igmp_max_memberships;
233 int sysctl_igmp_max_msf;
234 int sysctl_igmp_qrv;
235
236 struct ping_group_range ping_group_range;
237
238 atomic_t dev_addr_genid;
239
240 unsigned int sysctl_udp_child_hash_entries;
241
242 #ifdef CONFIG_SYSCTL
243 unsigned long *sysctl_local_reserved_ports;
244 int sysctl_ip_prot_sock;
245 #endif
246
247 #ifdef CONFIG_IP_MROUTE
248 #ifndef CONFIG_IP_MROUTE_MULTIPLE_TABLES
249 struct mr_table *mrt;
250 #else
251 struct list_head mr_tables;
252 struct fib_rules_ops *mr_rules_ops;
253 #endif
254 #endif
255 #ifdef CONFIG_IP_ROUTE_MULTIPATH
256 struct sysctl_fib_multipath_hash_seed sysctl_fib_multipath_hash_seed;
257 u32 sysctl_fib_multipath_hash_fields;
258 u8 sysctl_fib_multipath_use_neigh;
259 u8 sysctl_fib_multipath_hash_policy;
260 #endif
261
262 struct fib_notifier_ops *notifier_ops;
263 unsigned int fib_seq; /* protected by rtnl_mutex */
264
265 struct fib_notifier_ops *ipmr_notifier_ops;
266 unsigned int ipmr_seq; /* protected by rtnl_mutex */
267
268 atomic_t rt_genid;
269 siphash_key_t ip_id_key;
270 };
271 #endif
272
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