2 * sysctl_net_core.c: sysctl interface to net core subsystem.
4 * Begun April 1, 1996, Mike Shaver.
5 * Added /proc/sys/net/core directory entry (empty =) ). [MS]
9 #include <linux/sysctl.h>
10 #include <linux/module.h>
11 #include <linux/socket.h>
12 #include <linux/netdevice.h>
13 #include <linux/ratelimit.h>
14 #include <linux/vmalloc.h>
15 #include <linux/init.h>
16 #include <linux/slab.h>
17 #include <linux/kmemleak.h>
21 #include <net/net_ratelimit.h>
25 static int ushort_max
= USHRT_MAX
;
26 static int min_sndbuf
= SOCK_MIN_SNDBUF
;
27 static int min_rcvbuf
= SOCK_MIN_RCVBUF
;
30 static int rps_sock_flow_sysctl(ctl_table
*table
, int write
,
31 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
33 unsigned int orig_size
, size
;
37 .maxlen
= sizeof(size
),
40 struct rps_sock_flow_table
*orig_sock_table
, *sock_table
;
41 static DEFINE_MUTEX(sock_flow_mutex
);
43 mutex_lock(&sock_flow_mutex
);
45 orig_sock_table
= rcu_dereference_protected(rps_sock_flow_table
,
46 lockdep_is_held(&sock_flow_mutex
));
47 size
= orig_size
= orig_sock_table
? orig_sock_table
->mask
+ 1 : 0;
49 ret
= proc_dointvec(&tmp
, write
, buffer
, lenp
, ppos
);
54 /* Enforce limit to prevent overflow */
55 mutex_unlock(&sock_flow_mutex
);
58 size
= roundup_pow_of_two(size
);
59 if (size
!= orig_size
) {
61 vmalloc(RPS_SOCK_FLOW_TABLE_SIZE(size
));
63 mutex_unlock(&sock_flow_mutex
);
67 sock_table
->mask
= size
- 1;
69 sock_table
= orig_sock_table
;
71 for (i
= 0; i
< size
; i
++)
72 sock_table
->ents
[i
] = RPS_NO_CPU
;
76 if (sock_table
!= orig_sock_table
) {
77 rcu_assign_pointer(rps_sock_flow_table
, sock_table
);
79 static_key_slow_inc(&rps_needed
);
80 if (orig_sock_table
) {
81 static_key_slow_dec(&rps_needed
);
83 vfree(orig_sock_table
);
88 mutex_unlock(&sock_flow_mutex
);
92 #endif /* CONFIG_RPS */
94 static struct ctl_table net_core_table
[] = {
97 .procname
= "wmem_max",
98 .data
= &sysctl_wmem_max
,
99 .maxlen
= sizeof(int),
101 .proc_handler
= proc_dointvec_minmax
,
102 .extra1
= &min_sndbuf
,
105 .procname
= "rmem_max",
106 .data
= &sysctl_rmem_max
,
107 .maxlen
= sizeof(int),
109 .proc_handler
= proc_dointvec_minmax
,
110 .extra1
= &min_rcvbuf
,
113 .procname
= "wmem_default",
114 .data
= &sysctl_wmem_default
,
115 .maxlen
= sizeof(int),
117 .proc_handler
= proc_dointvec_minmax
,
118 .extra1
= &min_sndbuf
,
121 .procname
= "rmem_default",
122 .data
= &sysctl_rmem_default
,
123 .maxlen
= sizeof(int),
125 .proc_handler
= proc_dointvec_minmax
,
126 .extra1
= &min_rcvbuf
,
129 .procname
= "dev_weight",
131 .maxlen
= sizeof(int),
133 .proc_handler
= proc_dointvec
136 .procname
= "netdev_max_backlog",
137 .data
= &netdev_max_backlog
,
138 .maxlen
= sizeof(int),
140 .proc_handler
= proc_dointvec
142 #ifdef CONFIG_BPF_JIT
144 .procname
= "bpf_jit_enable",
145 .data
= &bpf_jit_enable
,
146 .maxlen
= sizeof(int),
148 .proc_handler
= proc_dointvec
152 .procname
= "netdev_tstamp_prequeue",
153 .data
= &netdev_tstamp_prequeue
,
154 .maxlen
= sizeof(int),
156 .proc_handler
= proc_dointvec
159 .procname
= "message_cost",
160 .data
= &net_ratelimit_state
.interval
,
161 .maxlen
= sizeof(int),
163 .proc_handler
= proc_dointvec_jiffies
,
166 .procname
= "message_burst",
167 .data
= &net_ratelimit_state
.burst
,
168 .maxlen
= sizeof(int),
170 .proc_handler
= proc_dointvec
,
173 .procname
= "optmem_max",
174 .data
= &sysctl_optmem_max
,
175 .maxlen
= sizeof(int),
177 .proc_handler
= proc_dointvec
181 .procname
= "rps_sock_flow_entries",
182 .maxlen
= sizeof(int),
184 .proc_handler
= rps_sock_flow_sysctl
187 #endif /* CONFIG_NET */
189 .procname
= "netdev_budget",
190 .data
= &netdev_budget
,
191 .maxlen
= sizeof(int),
193 .proc_handler
= proc_dointvec
196 .procname
= "warnings",
197 .data
= &net_msg_warn
,
198 .maxlen
= sizeof(int),
200 .proc_handler
= proc_dointvec
205 static struct ctl_table netns_core_table
[] = {
207 .procname
= "somaxconn",
208 .data
= &init_net
.core
.sysctl_somaxconn
,
209 .maxlen
= sizeof(int),
212 .extra2
= &ushort_max
,
213 .proc_handler
= proc_dointvec_minmax
218 static __net_init
int sysctl_core_net_init(struct net
*net
)
220 struct ctl_table
*tbl
;
222 net
->core
.sysctl_somaxconn
= SOMAXCONN
;
224 tbl
= netns_core_table
;
225 if (!net_eq(net
, &init_net
)) {
226 tbl
= kmemdup(tbl
, sizeof(netns_core_table
), GFP_KERNEL
);
230 tbl
[0].data
= &net
->core
.sysctl_somaxconn
;
232 /* Don't export any sysctls to unprivileged users */
233 if (net
->user_ns
!= &init_user_ns
) {
234 tbl
[0].procname
= NULL
;
238 net
->core
.sysctl_hdr
= register_net_sysctl(net
, "net/core", tbl
);
239 if (net
->core
.sysctl_hdr
== NULL
)
245 if (tbl
!= netns_core_table
)
251 static __net_exit
void sysctl_core_net_exit(struct net
*net
)
253 struct ctl_table
*tbl
;
255 tbl
= net
->core
.sysctl_hdr
->ctl_table_arg
;
256 unregister_net_sysctl_table(net
->core
.sysctl_hdr
);
257 BUG_ON(tbl
== netns_core_table
);
261 static __net_initdata
struct pernet_operations sysctl_core_ops
= {
262 .init
= sysctl_core_net_init
,
263 .exit
= sysctl_core_net_exit
,
266 static __init
int sysctl_core_init(void)
268 register_net_sysctl(&init_net
, "net/core", net_core_table
);
269 return register_pernet_subsys(&sysctl_core_ops
);
272 fs_initcall(sysctl_core_init
);