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>
24 static int rps_sock_flow_sysctl(ctl_table *table, int write,
25 void __user *buffer, size_t *lenp, loff_t *ppos)
27 unsigned int orig_size, size;
31 .maxlen = sizeof(size),
34 struct rps_sock_flow_table *orig_sock_table, *sock_table;
35 static DEFINE_MUTEX(sock_flow_mutex);
37 mutex_lock(&sock_flow_mutex);
39 orig_sock_table = rcu_dereference_protected(rps_sock_flow_table,
40 lockdep_is_held(&sock_flow_mutex));
41 size = orig_size = orig_sock_table ? orig_sock_table->mask + 1 : 0;
43 ret = proc_dointvec(&tmp, write, buffer, lenp, ppos);
48 /* Enforce limit to prevent overflow */
49 mutex_unlock(&sock_flow_mutex);
52 size = roundup_pow_of_two(size);
53 if (size != orig_size) {
55 vmalloc(RPS_SOCK_FLOW_TABLE_SIZE(size));
57 mutex_unlock(&sock_flow_mutex);
61 sock_table->mask = size - 1;
63 sock_table = orig_sock_table;
65 for (i = 0; i < size; i++)
66 sock_table->ents[i] = RPS_NO_CPU;
70 if (sock_table != orig_sock_table) {
71 rcu_assign_pointer(rps_sock_flow_table, sock_table);
73 static_key_slow_inc(&rps_needed);
74 if (orig_sock_table) {
75 static_key_slow_dec(&rps_needed);
77 vfree(orig_sock_table);
82 mutex_unlock(&sock_flow_mutex);
86 #endif /* CONFIG_RPS */
88 static struct ctl_table net_core_table[] = {
91 .procname = "wmem_max",
92 .data = &sysctl_wmem_max,
93 .maxlen = sizeof(int),
95 .proc_handler = proc_dointvec
98 .procname = "rmem_max",
99 .data = &sysctl_rmem_max,
100 .maxlen = sizeof(int),
102 .proc_handler = proc_dointvec
105 .procname = "wmem_default",
106 .data = &sysctl_wmem_default,
107 .maxlen = sizeof(int),
109 .proc_handler = proc_dointvec
112 .procname = "rmem_default",
113 .data = &sysctl_rmem_default,
114 .maxlen = sizeof(int),
116 .proc_handler = proc_dointvec
119 .procname = "dev_weight",
121 .maxlen = sizeof(int),
123 .proc_handler = proc_dointvec
126 .procname = "netdev_max_backlog",
127 .data = &netdev_max_backlog,
128 .maxlen = sizeof(int),
130 .proc_handler = proc_dointvec
132 #ifdef CONFIG_BPF_JIT
134 .procname = "bpf_jit_enable",
135 .data = &bpf_jit_enable,
136 .maxlen = sizeof(int),
138 .proc_handler = proc_dointvec
142 .procname = "netdev_tstamp_prequeue",
143 .data = &netdev_tstamp_prequeue,
144 .maxlen = sizeof(int),
146 .proc_handler = proc_dointvec
149 .procname = "message_cost",
150 .data = &net_ratelimit_state.interval,
151 .maxlen = sizeof(int),
153 .proc_handler = proc_dointvec_jiffies,
156 .procname = "message_burst",
157 .data = &net_ratelimit_state.burst,
158 .maxlen = sizeof(int),
160 .proc_handler = proc_dointvec,
163 .procname = "optmem_max",
164 .data = &sysctl_optmem_max,
165 .maxlen = sizeof(int),
167 .proc_handler = proc_dointvec
171 .procname = "rps_sock_flow_entries",
172 .maxlen = sizeof(int),
174 .proc_handler = rps_sock_flow_sysctl
177 #endif /* CONFIG_NET */
179 .procname = "netdev_budget",
180 .data = &netdev_budget,
181 .maxlen = sizeof(int),
183 .proc_handler = proc_dointvec
186 .procname = "warnings",
187 .data = &net_msg_warn,
188 .maxlen = sizeof(int),
190 .proc_handler = proc_dointvec
195 static struct ctl_table netns_core_table[] = {
197 .procname = "somaxconn",
198 .data = &init_net.core.sysctl_somaxconn,
199 .maxlen = sizeof(int),
201 .proc_handler = proc_dointvec
206 static __net_init int sysctl_core_net_init(struct net *net)
208 struct ctl_table *tbl;
210 net->core.sysctl_somaxconn = SOMAXCONN;
212 tbl = netns_core_table;
213 if (!net_eq(net, &init_net)) {
214 tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL);
218 tbl[0].data = &net->core.sysctl_somaxconn;
221 net->core.sysctl_hdr = register_net_sysctl(net, "net/core", tbl);
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 register_net_sysctl(&init_net, "net/core", net_core_table);
252 return register_pernet_subsys(&sysctl_core_ops);
255 fs_initcall(sysctl_core_init);