ipv4.h

  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	/* ICMP rate limiter hot cache line. */
 92	__cacheline_group_begin_aligned(icmp);
 93	atomic_t	icmp_global_credit;
 94	u32		icmp_global_stamp;
 95	__cacheline_group_end_aligned(icmp);
 96
 97	struct inet_timewait_death_row tcp_death_row;
 98	struct udp_table *udp_table;
 99
100#if IS_ENABLED(CONFIG_NET_UDP_TUNNEL)
101	/* Not in a pernet subsys because need to be available at GRO stage */
102	struct udp_tunnel_gro udp_tunnel_gro[2];
103#endif
104
105#ifdef CONFIG_SYSCTL
106	struct ctl_table_header	*forw_hdr;
107	struct ctl_table_header	*frags_hdr;
108	struct ctl_table_header	*ipv4_hdr;
109	struct ctl_table_header *route_hdr;
110	struct ctl_table_header *xfrm4_hdr;
111#endif
112	struct ipv4_devconf	*devconf_all;
113	struct ipv4_devconf	*devconf_dflt;
114	struct ip_ra_chain __rcu *ra_chain;
115	struct mutex		ra_mutex;
116#ifdef CONFIG_IP_MULTIPLE_TABLES
117	struct fib_rules_ops	*rules_ops;
118	struct fib_table __rcu	*fib_main;
119	struct fib_table __rcu	*fib_default;
120	unsigned int		fib_rules_require_fldissect;
121	bool			fib_has_custom_rules;
122#endif
123	bool			fib_has_custom_local_routes;
124	bool			fib_offload_disabled;
125	u8			sysctl_tcp_shrink_window;
126#ifdef CONFIG_IP_ROUTE_CLASSID
127	atomic_t		fib_num_tclassid_users;
128#endif
129	struct hlist_head	*fib_table_hash;
130	struct sock		*fibnl;
131	struct hlist_head	*fib_info_hash;
132	unsigned int		fib_info_hash_bits;
133	unsigned int		fib_info_cnt;
134
135	struct sock		*mc_autojoin_sk;
136
137	struct inet_peer_base	*peers;
138	struct fqdir		*fqdir;
139
140	u8 sysctl_icmp_echo_ignore_all;
141	u8 sysctl_icmp_echo_enable_probe;
142	u8 sysctl_icmp_echo_ignore_broadcasts;
143	u8 sysctl_icmp_ignore_bogus_error_responses;
144	u8 sysctl_icmp_errors_use_inbound_ifaddr;
145	u8 sysctl_icmp_errors_extension_mask;
146	int sysctl_icmp_ratelimit;
147	int sysctl_icmp_ratemask;
148	int sysctl_icmp_msgs_per_sec;
149	int sysctl_icmp_msgs_burst;
150
151	u32 ip_rt_min_pmtu;
152	int ip_rt_mtu_expires;
153	int ip_rt_min_advmss;
154
155	struct local_ports ip_local_ports;
156
157	u8 sysctl_tcp_ecn;
158	u8 sysctl_tcp_ecn_option;
159	u8 sysctl_tcp_ecn_option_beacon;
160	u8 sysctl_tcp_ecn_fallback;
161
162	u8 sysctl_ip_default_ttl;
163	u8 sysctl_ip_no_pmtu_disc;
164	u8 sysctl_ip_fwd_update_priority;
165	u8 sysctl_ip_nonlocal_bind;
166	u8 sysctl_ip_autobind_reuse;
167	/* Shall we try to damage output packets if routing dev changes? */
168	u8 sysctl_ip_dynaddr;
169#ifdef CONFIG_NET_L3_MASTER_DEV
170	u8 sysctl_raw_l3mdev_accept;
171#endif
172	u8 sysctl_udp_early_demux;
173
174	u8 sysctl_nexthop_compat_mode;
175
176	u8 sysctl_fwmark_reflect;
177	u8 sysctl_tcp_fwmark_accept;
178	u8 sysctl_tcp_mtu_probing;
179	int sysctl_tcp_mtu_probe_floor;
180	int sysctl_tcp_base_mss;
181	int sysctl_tcp_probe_threshold;
182	u32 sysctl_tcp_probe_interval;
183
184	int sysctl_tcp_keepalive_time;
185	int sysctl_tcp_keepalive_intvl;
186	u8 sysctl_tcp_keepalive_probes;
187
188	u8 sysctl_tcp_syn_retries;
189	u8 sysctl_tcp_synack_retries;
190	u8 sysctl_tcp_syncookies;
191	u8 sysctl_tcp_migrate_req;
192	u8 sysctl_tcp_comp_sack_nr;
193	u8 sysctl_tcp_backlog_ack_defer;
194	u8 sysctl_tcp_pingpong_thresh;
195
196	u8 sysctl_tcp_retries1;
197	u8 sysctl_tcp_retries2;
198	u8 sysctl_tcp_orphan_retries;
199	u8 sysctl_tcp_tw_reuse;
200	unsigned int sysctl_tcp_tw_reuse_delay;
201	int sysctl_tcp_fin_timeout;
202	u8 sysctl_tcp_sack;
203	u8 sysctl_tcp_window_scaling;
204	u8 sysctl_tcp_timestamps;
205	int sysctl_tcp_rto_min_us;
206	int sysctl_tcp_rto_max_ms;
207	u8 sysctl_tcp_recovery;
208	u8 sysctl_tcp_thin_linear_timeouts;
209	u8 sysctl_tcp_slow_start_after_idle;
210	u8 sysctl_tcp_retrans_collapse;
211	u8 sysctl_tcp_stdurg;
212	u8 sysctl_tcp_rfc1337;
213	u8 sysctl_tcp_abort_on_overflow;
214	u8 sysctl_tcp_fack; /* obsolete */
215	int sysctl_tcp_max_reordering;
216	int sysctl_tcp_adv_win_scale; /* obsolete */
217	u8 sysctl_tcp_dsack;
218	u8 sysctl_tcp_app_win;
219	u8 sysctl_tcp_frto;
220	u8 sysctl_tcp_nometrics_save;
221	u8 sysctl_tcp_no_ssthresh_metrics_save;
222	u8 sysctl_tcp_workaround_signed_windows;
223	int sysctl_tcp_challenge_ack_limit;
224	u8 sysctl_tcp_min_tso_segs;
225	u8 sysctl_tcp_reflect_tos;
226	int sysctl_tcp_invalid_ratelimit;
227	int sysctl_tcp_pacing_ss_ratio;
228	int sysctl_tcp_pacing_ca_ratio;
229	unsigned int sysctl_tcp_child_ehash_entries;
230	int sysctl_tcp_comp_sack_rtt_percent;
231	unsigned long sysctl_tcp_comp_sack_delay_ns;
232	unsigned long sysctl_tcp_comp_sack_slack_ns;
233	int sysctl_max_syn_backlog;
234	int sysctl_tcp_fastopen;
235	const struct tcp_congestion_ops __rcu  *tcp_congestion_control;
236	struct tcp_fastopen_context __rcu *tcp_fastopen_ctx;
237	unsigned int sysctl_tcp_fastopen_blackhole_timeout;
238	atomic_t tfo_active_disable_times;
239	unsigned long tfo_active_disable_stamp;
240	u32 tcp_challenge_timestamp;
241	u32 tcp_challenge_count;
242	u8 sysctl_tcp_plb_enabled;
243	u8 sysctl_tcp_plb_idle_rehash_rounds;
244	u8 sysctl_tcp_plb_rehash_rounds;
245	u8 sysctl_tcp_plb_suspend_rto_sec;
246	int sysctl_tcp_plb_cong_thresh;
247
248	int sysctl_udp_wmem_min;
249	int sysctl_udp_rmem_min;
250
251	u8 sysctl_fib_notify_on_flag_change;
252	u8 sysctl_tcp_syn_linear_timeouts;
253
254#ifdef CONFIG_NET_L3_MASTER_DEV
255	u8 sysctl_udp_l3mdev_accept;
256#endif
257
258	u8 sysctl_igmp_llm_reports;
259	int sysctl_igmp_max_memberships;
260	int sysctl_igmp_max_msf;
261	int sysctl_igmp_qrv;
262
263	struct ping_group_range ping_group_range;
264	u16			ping_port_rover;
265
266	atomic_t dev_addr_genid;
267
268	unsigned int sysctl_udp_child_hash_entries;
269
270#ifdef CONFIG_SYSCTL
271	unsigned long *sysctl_local_reserved_ports;
272	int sysctl_ip_prot_sock;
273#endif
274
275#ifdef CONFIG_IP_MROUTE
276#ifndef CONFIG_IP_MROUTE_MULTIPLE_TABLES
277	struct mr_table		*mrt;
278#else
279	struct list_head	mr_tables;
280	struct fib_rules_ops	*mr_rules_ops;
281#endif
282#endif
283#ifdef CONFIG_IP_ROUTE_MULTIPATH
284	struct sysctl_fib_multipath_hash_seed sysctl_fib_multipath_hash_seed;
285	u32 sysctl_fib_multipath_hash_fields;
286	u8 sysctl_fib_multipath_use_neigh;
287	u8 sysctl_fib_multipath_hash_policy;
288#endif
289
290	struct fib_notifier_ops	*notifier_ops;
291	unsigned int	fib_seq;	/* writes protected by rtnl_mutex */
292
293	struct fib_notifier_ops	*ipmr_notifier_ops;
294	unsigned int	ipmr_seq;	/* protected by rtnl_mutex */
295
296	atomic_t	rt_genid;
297	siphash_key_t	ip_id_key;
298	struct hlist_head	*inet_addr_lst;
299	struct delayed_work	addr_chk_work;
300};
301
302#endif