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 	seqlock_t	lock;
23 	int		range[2];
24 	bool		warned;
25 };
26 
27 struct ping_group_range {
28 	seqlock_t	lock;
29 	kgid_t		range[2];
30 };
31 
32 struct inet_hashinfo;
33 
34 struct inet_timewait_death_row {
35 	refcount_t		tw_refcount;
36 
37 	/* Padding to avoid false sharing, tw_refcount can be often written */
38 	struct inet_hashinfo 	*hashinfo ____cacheline_aligned_in_smp;
39 	int			sysctl_max_tw_buckets;
40 };
41 
42 struct tcp_fastopen_context;
43 
44 struct netns_ipv4 {
45 	struct inet_timewait_death_row tcp_death_row;
46 
47 #ifdef CONFIG_SYSCTL
48 	struct ctl_table_header	*forw_hdr;
49 	struct ctl_table_header	*frags_hdr;
50 	struct ctl_table_header	*ipv4_hdr;
51 	struct ctl_table_header *route_hdr;
52 	struct ctl_table_header *xfrm4_hdr;
53 #endif
54 	struct ipv4_devconf	*devconf_all;
55 	struct ipv4_devconf	*devconf_dflt;
56 	struct ip_ra_chain __rcu *ra_chain;
57 	struct mutex		ra_mutex;
58 #ifdef CONFIG_IP_MULTIPLE_TABLES
59 	struct fib_rules_ops	*rules_ops;
60 	struct fib_table __rcu	*fib_main;
61 	struct fib_table __rcu	*fib_default;
62 	unsigned int		fib_rules_require_fldissect;
63 	bool			fib_has_custom_rules;
64 #endif
65 	bool			fib_has_custom_local_routes;
66 	bool			fib_offload_disabled;
67 #ifdef CONFIG_IP_ROUTE_CLASSID
68 	atomic_t		fib_num_tclassid_users;
69 #endif
70 	struct hlist_head	*fib_table_hash;
71 	struct sock		*fibnl;
72 
73 	struct sock		*mc_autojoin_sk;
74 
75 	struct inet_peer_base	*peers;
76 	struct fqdir		*fqdir;
77 
78 	u8 sysctl_icmp_echo_ignore_all;
79 	u8 sysctl_icmp_echo_enable_probe;
80 	u8 sysctl_icmp_echo_ignore_broadcasts;
81 	u8 sysctl_icmp_ignore_bogus_error_responses;
82 	u8 sysctl_icmp_errors_use_inbound_ifaddr;
83 	int sysctl_icmp_ratelimit;
84 	int sysctl_icmp_ratemask;
85 
86 	u32 ip_rt_min_pmtu;
87 	int ip_rt_mtu_expires;
88 	int ip_rt_min_advmss;
89 
90 	struct local_ports ip_local_ports;
91 
92 	u8 sysctl_tcp_ecn;
93 	u8 sysctl_tcp_ecn_fallback;
94 
95 	u8 sysctl_ip_default_ttl;
96 	u8 sysctl_ip_no_pmtu_disc;
97 	u8 sysctl_ip_fwd_use_pmtu;
98 	u8 sysctl_ip_fwd_update_priority;
99 	u8 sysctl_ip_nonlocal_bind;
100 	u8 sysctl_ip_autobind_reuse;
101 	/* Shall we try to damage output packets if routing dev changes? */
102 	u8 sysctl_ip_dynaddr;
103 	u8 sysctl_ip_early_demux;
104 #ifdef CONFIG_NET_L3_MASTER_DEV
105 	u8 sysctl_raw_l3mdev_accept;
106 #endif
107 	u8 sysctl_tcp_early_demux;
108 	u8 sysctl_udp_early_demux;
109 
110 	u8 sysctl_nexthop_compat_mode;
111 
112 	u8 sysctl_fwmark_reflect;
113 	u8 sysctl_tcp_fwmark_accept;
114 #ifdef CONFIG_NET_L3_MASTER_DEV
115 	u8 sysctl_tcp_l3mdev_accept;
116 #endif
117 	u8 sysctl_tcp_mtu_probing;
118 	int sysctl_tcp_mtu_probe_floor;
119 	int sysctl_tcp_base_mss;
120 	int sysctl_tcp_min_snd_mss;
121 	int sysctl_tcp_probe_threshold;
122 	u32 sysctl_tcp_probe_interval;
123 
124 	int sysctl_tcp_keepalive_time;
125 	int sysctl_tcp_keepalive_intvl;
126 	u8 sysctl_tcp_keepalive_probes;
127 
128 	u8 sysctl_tcp_syn_retries;
129 	u8 sysctl_tcp_synack_retries;
130 	u8 sysctl_tcp_syncookies;
131 	u8 sysctl_tcp_migrate_req;
132 	u8 sysctl_tcp_comp_sack_nr;
133 	int sysctl_tcp_reordering;
134 	u8 sysctl_tcp_retries1;
135 	u8 sysctl_tcp_retries2;
136 	u8 sysctl_tcp_orphan_retries;
137 	u8 sysctl_tcp_tw_reuse;
138 	int sysctl_tcp_fin_timeout;
139 	unsigned int sysctl_tcp_notsent_lowat;
140 	u8 sysctl_tcp_sack;
141 	u8 sysctl_tcp_window_scaling;
142 	u8 sysctl_tcp_timestamps;
143 	u8 sysctl_tcp_early_retrans;
144 	u8 sysctl_tcp_recovery;
145 	u8 sysctl_tcp_thin_linear_timeouts;
146 	u8 sysctl_tcp_slow_start_after_idle;
147 	u8 sysctl_tcp_retrans_collapse;
148 	u8 sysctl_tcp_stdurg;
149 	u8 sysctl_tcp_rfc1337;
150 	u8 sysctl_tcp_abort_on_overflow;
151 	u8 sysctl_tcp_fack; /* obsolete */
152 	int sysctl_tcp_max_reordering;
153 	int sysctl_tcp_adv_win_scale;
154 	u8 sysctl_tcp_dsack;
155 	u8 sysctl_tcp_app_win;
156 	u8 sysctl_tcp_frto;
157 	u8 sysctl_tcp_nometrics_save;
158 	u8 sysctl_tcp_no_ssthresh_metrics_save;
159 	u8 sysctl_tcp_moderate_rcvbuf;
160 	u8 sysctl_tcp_tso_win_divisor;
161 	u8 sysctl_tcp_workaround_signed_windows;
162 	int sysctl_tcp_limit_output_bytes;
163 	int sysctl_tcp_challenge_ack_limit;
164 	int sysctl_tcp_min_rtt_wlen;
165 	u8 sysctl_tcp_min_tso_segs;
166 	u8 sysctl_tcp_tso_rtt_log;
167 	u8 sysctl_tcp_autocorking;
168 	u8 sysctl_tcp_reflect_tos;
169 	int sysctl_tcp_invalid_ratelimit;
170 	int sysctl_tcp_pacing_ss_ratio;
171 	int sysctl_tcp_pacing_ca_ratio;
172 	int sysctl_tcp_wmem[3];
173 	int sysctl_tcp_rmem[3];
174 	unsigned int sysctl_tcp_child_ehash_entries;
175 	unsigned long sysctl_tcp_comp_sack_delay_ns;
176 	unsigned long sysctl_tcp_comp_sack_slack_ns;
177 	int sysctl_max_syn_backlog;
178 	int sysctl_tcp_fastopen;
179 	const struct tcp_congestion_ops __rcu  *tcp_congestion_control;
180 	struct tcp_fastopen_context __rcu *tcp_fastopen_ctx;
181 	unsigned int sysctl_tcp_fastopen_blackhole_timeout;
182 	atomic_t tfo_active_disable_times;
183 	unsigned long tfo_active_disable_stamp;
184 	u32 tcp_challenge_timestamp;
185 	u32 tcp_challenge_count;
186 
187 	int sysctl_udp_wmem_min;
188 	int sysctl_udp_rmem_min;
189 
190 	u8 sysctl_fib_notify_on_flag_change;
191 
192 #ifdef CONFIG_NET_L3_MASTER_DEV
193 	u8 sysctl_udp_l3mdev_accept;
194 #endif
195 
196 	u8 sysctl_igmp_llm_reports;
197 	int sysctl_igmp_max_memberships;
198 	int sysctl_igmp_max_msf;
199 	int sysctl_igmp_qrv;
200 
201 	struct ping_group_range ping_group_range;
202 
203 	atomic_t dev_addr_genid;
204 
205 #ifdef CONFIG_SYSCTL
206 	unsigned long *sysctl_local_reserved_ports;
207 	int sysctl_ip_prot_sock;
208 #endif
209 
210 #ifdef CONFIG_IP_MROUTE
211 #ifndef CONFIG_IP_MROUTE_MULTIPLE_TABLES
212 	struct mr_table		*mrt;
213 #else
214 	struct list_head	mr_tables;
215 	struct fib_rules_ops	*mr_rules_ops;
216 #endif
217 #endif
218 #ifdef CONFIG_IP_ROUTE_MULTIPATH
219 	u32 sysctl_fib_multipath_hash_fields;
220 	u8 sysctl_fib_multipath_use_neigh;
221 	u8 sysctl_fib_multipath_hash_policy;
222 #endif
223 
224 	struct fib_notifier_ops	*notifier_ops;
225 	unsigned int	fib_seq;	/* protected by rtnl_mutex */
226 
227 	struct fib_notifier_ops	*ipmr_notifier_ops;
228 	unsigned int	ipmr_seq;	/* protected by rtnl_mutex */
229 
230 	atomic_t	rt_genid;
231 	siphash_key_t	ip_id_key;
232 };
233 #endif
234