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>
22 static int rps_sock_flow_sysctl(ctl_table *table, int write,
23 void __user *buffer, size_t *lenp, loff_t *ppos)
25 unsigned int orig_size, size;
29 .maxlen = sizeof(size),
32 struct rps_sock_flow_table *orig_sock_table, *sock_table;
33 static DEFINE_MUTEX(sock_flow_mutex);
35 mutex_lock(&sock_flow_mutex);
37 orig_sock_table = rcu_dereference_protected(rps_sock_flow_table,
38 lockdep_is_held(&sock_flow_mutex));
39 size = orig_size = orig_sock_table ? orig_sock_table->mask + 1 : 0;
41 ret = proc_dointvec(&tmp, write, buffer, lenp, ppos);
46 /* Enforce limit to prevent overflow */
47 mutex_unlock(&sock_flow_mutex);
50 size = roundup_pow_of_two(size);
51 if (size != orig_size) {
53 vmalloc(RPS_SOCK_FLOW_TABLE_SIZE(size));
55 mutex_unlock(&sock_flow_mutex);
59 sock_table->mask = size - 1;
61 sock_table = orig_sock_table;
63 for (i = 0; i < size; i++)
64 sock_table->ents[i] = RPS_NO_CPU;
68 if (sock_table != orig_sock_table) {
69 rcu_assign_pointer(rps_sock_flow_table, sock_table);
71 vfree(orig_sock_table);
75 mutex_unlock(&sock_flow_mutex);
79 #endif /* CONFIG_RPS */
81 static struct ctl_table net_core_table[] = {
84 .procname = "wmem_max",
85 .data = &sysctl_wmem_max,
86 .maxlen = sizeof(int),
88 .proc_handler = proc_dointvec
91 .procname = "rmem_max",
92 .data = &sysctl_rmem_max,
93 .maxlen = sizeof(int),
95 .proc_handler = proc_dointvec
98 .procname = "wmem_default",
99 .data = &sysctl_wmem_default,
100 .maxlen = sizeof(int),
102 .proc_handler = proc_dointvec
105 .procname = "rmem_default",
106 .data = &sysctl_rmem_default,
107 .maxlen = sizeof(int),
109 .proc_handler = proc_dointvec
112 .procname = "dev_weight",
114 .maxlen = sizeof(int),
116 .proc_handler = proc_dointvec
119 .procname = "netdev_max_backlog",
120 .data = &netdev_max_backlog,
121 .maxlen = sizeof(int),
123 .proc_handler = proc_dointvec
125 #ifdef CONFIG_BPF_JIT
127 .procname = "bpf_jit_enable",
128 .data = &bpf_jit_enable,
129 .maxlen = sizeof(int),
131 .proc_handler = proc_dointvec
135 .procname = "netdev_tstamp_prequeue",
136 .data = &netdev_tstamp_prequeue,
137 .maxlen = sizeof(int),
139 .proc_handler = proc_dointvec
142 .procname = "message_cost",
143 .data = &net_ratelimit_state.interval,
144 .maxlen = sizeof(int),
146 .proc_handler = proc_dointvec_jiffies,
149 .procname = "message_burst",
150 .data = &net_ratelimit_state.burst,
151 .maxlen = sizeof(int),
153 .proc_handler = proc_dointvec,
156 .procname = "optmem_max",
157 .data = &sysctl_optmem_max,
158 .maxlen = sizeof(int),
160 .proc_handler = proc_dointvec
164 .procname = "rps_sock_flow_entries",
165 .maxlen = sizeof(int),
167 .proc_handler = rps_sock_flow_sysctl
170 #endif /* CONFIG_NET */
172 .procname = "netdev_budget",
173 .data = &netdev_budget,
174 .maxlen = sizeof(int),
176 .proc_handler = proc_dointvec
179 .procname = "warnings",
180 .data = &net_msg_warn,
181 .maxlen = sizeof(int),
183 .proc_handler = proc_dointvec
188 static struct ctl_table netns_core_table[] = {
190 .procname = "somaxconn",
191 .data = &init_net.core.sysctl_somaxconn,
192 .maxlen = sizeof(int),
194 .proc_handler = proc_dointvec
199 __net_initdata struct ctl_path net_core_path[] = {
200 { .procname = "net", },
201 { .procname = "core", },
205 static __net_init int sysctl_core_net_init(struct net *net)
207 struct ctl_table *tbl;
209 net->core.sysctl_somaxconn = SOMAXCONN;
211 tbl = netns_core_table;
212 if (!net_eq(net, &init_net)) {
213 tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL);
217 tbl[0].data = &net->core.sysctl_somaxconn;
220 net->core.sysctl_hdr = register_net_sysctl_table(net,
222 if (net->core.sysctl_hdr == NULL)
228 if (tbl != netns_core_table)
234 static __net_exit void sysctl_core_net_exit(struct net *net)
236 struct ctl_table *tbl;
238 tbl = net->core.sysctl_hdr->ctl_table_arg;
239 unregister_net_sysctl_table(net->core.sysctl_hdr);
240 BUG_ON(tbl == netns_core_table);
244 static __net_initdata struct pernet_operations sysctl_core_ops = {
245 .init = sysctl_core_net_init,
246 .exit = sysctl_core_net_exit,
249 static __init int sysctl_core_init(void)
251 static struct ctl_table empty[1];
253 register_sysctl_paths(net_core_path, empty);
254 register_net_sysctl_rotable(net_core_path, net_core_table);
255 return register_pernet_subsys(&sysctl_core_ops);
258 fs_initcall(sysctl_core_init);