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>
26 static int rps_sock_flow_sysctl(ctl_table *table, int write,
27 void __user *buffer, size_t *lenp, loff_t *ppos)
29 unsigned int orig_size, size;
33 .maxlen = sizeof(size),
36 struct rps_sock_flow_table *orig_sock_table, *sock_table;
37 static DEFINE_MUTEX(sock_flow_mutex);
39 mutex_lock(&sock_flow_mutex);
41 orig_sock_table = rcu_dereference_protected(rps_sock_flow_table,
42 lockdep_is_held(&sock_flow_mutex));
43 size = orig_size = orig_sock_table ? orig_sock_table->mask + 1 : 0;
45 ret = proc_dointvec(&tmp, write, buffer, lenp, ppos);
50 /* Enforce limit to prevent overflow */
51 mutex_unlock(&sock_flow_mutex);
54 size = roundup_pow_of_two(size);
55 if (size != orig_size) {
57 vmalloc(RPS_SOCK_FLOW_TABLE_SIZE(size));
59 mutex_unlock(&sock_flow_mutex);
63 sock_table->mask = size - 1;
65 sock_table = orig_sock_table;
67 for (i = 0; i < size; i++)
68 sock_table->ents[i] = RPS_NO_CPU;
72 if (sock_table != orig_sock_table) {
73 rcu_assign_pointer(rps_sock_flow_table, sock_table);
75 static_key_slow_inc(&rps_needed);
76 if (orig_sock_table) {
77 static_key_slow_dec(&rps_needed);
79 vfree(orig_sock_table);
84 mutex_unlock(&sock_flow_mutex);
88 #endif /* CONFIG_RPS */
90 static struct ctl_table net_core_table[] = {
93 .procname = "wmem_max",
94 .data = &sysctl_wmem_max,
95 .maxlen = sizeof(int),
97 .proc_handler = proc_dointvec_minmax,
101 .procname = "rmem_max",
102 .data = &sysctl_rmem_max,
103 .maxlen = sizeof(int),
105 .proc_handler = proc_dointvec_minmax,
109 .procname = "wmem_default",
110 .data = &sysctl_wmem_default,
111 .maxlen = sizeof(int),
113 .proc_handler = proc_dointvec_minmax,
117 .procname = "rmem_default",
118 .data = &sysctl_rmem_default,
119 .maxlen = sizeof(int),
121 .proc_handler = proc_dointvec_minmax,
125 .procname = "dev_weight",
127 .maxlen = sizeof(int),
129 .proc_handler = proc_dointvec
132 .procname = "netdev_max_backlog",
133 .data = &netdev_max_backlog,
134 .maxlen = sizeof(int),
136 .proc_handler = proc_dointvec
138 #ifdef CONFIG_BPF_JIT
140 .procname = "bpf_jit_enable",
141 .data = &bpf_jit_enable,
142 .maxlen = sizeof(int),
144 .proc_handler = proc_dointvec
148 .procname = "netdev_tstamp_prequeue",
149 .data = &netdev_tstamp_prequeue,
150 .maxlen = sizeof(int),
152 .proc_handler = proc_dointvec
155 .procname = "message_cost",
156 .data = &net_ratelimit_state.interval,
157 .maxlen = sizeof(int),
159 .proc_handler = proc_dointvec_jiffies,
162 .procname = "message_burst",
163 .data = &net_ratelimit_state.burst,
164 .maxlen = sizeof(int),
166 .proc_handler = proc_dointvec,
169 .procname = "optmem_max",
170 .data = &sysctl_optmem_max,
171 .maxlen = sizeof(int),
173 .proc_handler = proc_dointvec
177 .procname = "rps_sock_flow_entries",
178 .maxlen = sizeof(int),
180 .proc_handler = rps_sock_flow_sysctl
183 #endif /* CONFIG_NET */
185 .procname = "netdev_budget",
186 .data = &netdev_budget,
187 .maxlen = sizeof(int),
189 .proc_handler = proc_dointvec
192 .procname = "warnings",
193 .data = &net_msg_warn,
194 .maxlen = sizeof(int),
196 .proc_handler = proc_dointvec
201 static struct ctl_table netns_core_table[] = {
203 .procname = "somaxconn",
204 .data = &init_net.core.sysctl_somaxconn,
205 .maxlen = sizeof(int),
207 .proc_handler = proc_dointvec
212 static __net_init int sysctl_core_net_init(struct net *net)
214 struct ctl_table *tbl;
216 net->core.sysctl_somaxconn = SOMAXCONN;
218 tbl = netns_core_table;
219 if (!net_eq(net, &init_net)) {
220 tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL);
224 tbl[0].data = &net->core.sysctl_somaxconn;
226 /* Don't export any sysctls to unprivileged users */
227 if (net->user_ns != &init_user_ns) {
228 tbl[0].procname = NULL;
232 net->core.sysctl_hdr = register_net_sysctl(net, "net/core", tbl);
233 if (net->core.sysctl_hdr == NULL)
239 if (tbl != netns_core_table)
245 static __net_exit void sysctl_core_net_exit(struct net *net)
247 struct ctl_table *tbl;
249 tbl = net->core.sysctl_hdr->ctl_table_arg;
250 unregister_net_sysctl_table(net->core.sysctl_hdr);
251 BUG_ON(tbl == netns_core_table);
255 static __net_initdata struct pernet_operations sysctl_core_ops = {
256 .init = sysctl_core_net_init,
257 .exit = sysctl_core_net_exit,
260 static __init int sysctl_core_init(void)
262 register_net_sysctl(&init_net, "net/core", net_core_table);
263 return register_pernet_subsys(&sysctl_core_ops);
266 fs_initcall(sysctl_core_init);