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;
28 static int rps_sock_flow_sysctl(ctl_table *table, int write,
29 void __user *buffer, size_t *lenp, loff_t *ppos)
31 unsigned int orig_size, size;
35 .maxlen = sizeof(size),
38 struct rps_sock_flow_table *orig_sock_table, *sock_table;
39 static DEFINE_MUTEX(sock_flow_mutex);
41 mutex_lock(&sock_flow_mutex);
43 orig_sock_table = rcu_dereference_protected(rps_sock_flow_table,
44 lockdep_is_held(&sock_flow_mutex));
45 size = orig_size = orig_sock_table ? orig_sock_table->mask + 1 : 0;
47 ret = proc_dointvec(&tmp, write, buffer, lenp, ppos);
52 /* Enforce limit to prevent overflow */
53 mutex_unlock(&sock_flow_mutex);
56 size = roundup_pow_of_two(size);
57 if (size != orig_size) {
59 vmalloc(RPS_SOCK_FLOW_TABLE_SIZE(size));
61 mutex_unlock(&sock_flow_mutex);
65 sock_table->mask = size - 1;
67 sock_table = orig_sock_table;
69 for (i = 0; i < size; i++)
70 sock_table->ents[i] = RPS_NO_CPU;
74 if (sock_table != orig_sock_table) {
75 rcu_assign_pointer(rps_sock_flow_table, sock_table);
77 static_key_slow_inc(&rps_needed);
78 if (orig_sock_table) {
79 static_key_slow_dec(&rps_needed);
81 vfree(orig_sock_table);
86 mutex_unlock(&sock_flow_mutex);
90 #endif /* CONFIG_RPS */
92 static struct ctl_table net_core_table[] = {
95 .procname = "wmem_max",
96 .data = &sysctl_wmem_max,
97 .maxlen = sizeof(int),
99 .proc_handler = proc_dointvec_minmax,
103 .procname = "rmem_max",
104 .data = &sysctl_rmem_max,
105 .maxlen = sizeof(int),
107 .proc_handler = proc_dointvec_minmax,
111 .procname = "wmem_default",
112 .data = &sysctl_wmem_default,
113 .maxlen = sizeof(int),
115 .proc_handler = proc_dointvec_minmax,
119 .procname = "rmem_default",
120 .data = &sysctl_rmem_default,
121 .maxlen = sizeof(int),
123 .proc_handler = proc_dointvec_minmax,
127 .procname = "dev_weight",
129 .maxlen = sizeof(int),
131 .proc_handler = proc_dointvec
134 .procname = "netdev_max_backlog",
135 .data = &netdev_max_backlog,
136 .maxlen = sizeof(int),
138 .proc_handler = proc_dointvec
140 #ifdef CONFIG_BPF_JIT
142 .procname = "bpf_jit_enable",
143 .data = &bpf_jit_enable,
144 .maxlen = sizeof(int),
146 .proc_handler = proc_dointvec
150 .procname = "netdev_tstamp_prequeue",
151 .data = &netdev_tstamp_prequeue,
152 .maxlen = sizeof(int),
154 .proc_handler = proc_dointvec
157 .procname = "message_cost",
158 .data = &net_ratelimit_state.interval,
159 .maxlen = sizeof(int),
161 .proc_handler = proc_dointvec_jiffies,
164 .procname = "message_burst",
165 .data = &net_ratelimit_state.burst,
166 .maxlen = sizeof(int),
168 .proc_handler = proc_dointvec,
171 .procname = "optmem_max",
172 .data = &sysctl_optmem_max,
173 .maxlen = sizeof(int),
175 .proc_handler = proc_dointvec
179 .procname = "rps_sock_flow_entries",
180 .maxlen = sizeof(int),
182 .proc_handler = rps_sock_flow_sysctl
185 #endif /* CONFIG_NET */
187 .procname = "netdev_budget",
188 .data = &netdev_budget,
189 .maxlen = sizeof(int),
191 .proc_handler = proc_dointvec
194 .procname = "warnings",
195 .data = &net_msg_warn,
196 .maxlen = sizeof(int),
198 .proc_handler = proc_dointvec
203 static struct ctl_table netns_core_table[] = {
205 .procname = "somaxconn",
206 .data = &init_net.core.sysctl_somaxconn,
207 .maxlen = sizeof(int),
210 .extra2 = &ushort_max,
211 .proc_handler = proc_dointvec_minmax
216 static __net_init int sysctl_core_net_init(struct net *net)
218 struct ctl_table *tbl;
220 net->core.sysctl_somaxconn = SOMAXCONN;
222 tbl = netns_core_table;
223 if (!net_eq(net, &init_net)) {
224 tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL);
228 tbl[0].data = &net->core.sysctl_somaxconn;
230 /* Don't export any sysctls to unprivileged users */
231 if (net->user_ns != &init_user_ns) {
232 tbl[0].procname = NULL;
236 net->core.sysctl_hdr = register_net_sysctl(net, "net/core", tbl);
237 if (net->core.sysctl_hdr == NULL)
243 if (tbl != netns_core_table)
249 static __net_exit void sysctl_core_net_exit(struct net *net)
251 struct ctl_table *tbl;
253 tbl = net->core.sysctl_hdr->ctl_table_arg;
254 unregister_net_sysctl_table(net->core.sysctl_hdr);
255 BUG_ON(tbl == netns_core_table);
259 static __net_initdata struct pernet_operations sysctl_core_ops = {
260 .init = sysctl_core_net_init,
261 .exit = sysctl_core_net_exit,
264 static __init int sysctl_core_init(void)
266 register_net_sysctl(&init_net, "net/core", net_core_table);
267 return register_pernet_subsys(&sysctl_core_ops);
270 fs_initcall(sysctl_core_init);