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8#include <linux/mm.h>
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
18#include <net/ip.h>
19#include <net/sock.h>
20
21#ifdef CONFIG_RPS
22static int rps_sock_flow_sysctl(ctl_table *table, int write,
23 void __user *buffer, size_t *lenp, loff_t *ppos)
24{
25 unsigned int orig_size, size;
26 int ret, i;
27 ctl_table tmp = {
28 .data = &size,
29 .maxlen = sizeof(size),
30 .mode = table->mode
31 };
32 struct rps_sock_flow_table *orig_sock_table, *sock_table;
33 static DEFINE_MUTEX(sock_flow_mutex);
34
35 mutex_lock(&sock_flow_mutex);
36
37 orig_sock_table = rps_sock_flow_table;
38 size = orig_size = orig_sock_table ? orig_sock_table->mask + 1 : 0;
39
40 ret = proc_dointvec(&tmp, write, buffer, lenp, ppos);
41
42 if (write) {
43 if (size) {
44 if (size > 1<<30) {
45
46 mutex_unlock(&sock_flow_mutex);
47 return -EINVAL;
48 }
49 size = roundup_pow_of_two(size);
50 if (size != orig_size) {
51 sock_table =
52 vmalloc(RPS_SOCK_FLOW_TABLE_SIZE(size));
53 if (!sock_table) {
54 mutex_unlock(&sock_flow_mutex);
55 return -ENOMEM;
56 }
57
58 sock_table->mask = size - 1;
59 } else
60 sock_table = orig_sock_table;
61
62 for (i = 0; i < size; i++)
63 sock_table->ents[i] = RPS_NO_CPU;
64 } else
65 sock_table = NULL;
66
67 if (sock_table != orig_sock_table) {
68 rcu_assign_pointer(rps_sock_flow_table, sock_table);
69 synchronize_rcu();
70 vfree(orig_sock_table);
71 }
72 }
73
74 mutex_unlock(&sock_flow_mutex);
75
76 return ret;
77}
78#endif
79
80static struct ctl_table net_core_table[] = {
81#ifdef CONFIG_NET
82 {
83 .procname = "wmem_max",
84 .data = &sysctl_wmem_max,
85 .maxlen = sizeof(int),
86 .mode = 0644,
87 .proc_handler = proc_dointvec
88 },
89 {
90 .procname = "rmem_max",
91 .data = &sysctl_rmem_max,
92 .maxlen = sizeof(int),
93 .mode = 0644,
94 .proc_handler = proc_dointvec
95 },
96 {
97 .procname = "wmem_default",
98 .data = &sysctl_wmem_default,
99 .maxlen = sizeof(int),
100 .mode = 0644,
101 .proc_handler = proc_dointvec
102 },
103 {
104 .procname = "rmem_default",
105 .data = &sysctl_rmem_default,
106 .maxlen = sizeof(int),
107 .mode = 0644,
108 .proc_handler = proc_dointvec
109 },
110 {
111 .procname = "dev_weight",
112 .data = &weight_p,
113 .maxlen = sizeof(int),
114 .mode = 0644,
115 .proc_handler = proc_dointvec
116 },
117 {
118 .procname = "netdev_max_backlog",
119 .data = &netdev_max_backlog,
120 .maxlen = sizeof(int),
121 .mode = 0644,
122 .proc_handler = proc_dointvec
123 },
124 {
125 .procname = "netdev_tstamp_prequeue",
126 .data = &netdev_tstamp_prequeue,
127 .maxlen = sizeof(int),
128 .mode = 0644,
129 .proc_handler = proc_dointvec
130 },
131 {
132 .procname = "message_cost",
133 .data = &net_ratelimit_state.interval,
134 .maxlen = sizeof(int),
135 .mode = 0644,
136 .proc_handler = proc_dointvec_jiffies,
137 },
138 {
139 .procname = "message_burst",
140 .data = &net_ratelimit_state.burst,
141 .maxlen = sizeof(int),
142 .mode = 0644,
143 .proc_handler = proc_dointvec,
144 },
145 {
146 .procname = "optmem_max",
147 .data = &sysctl_optmem_max,
148 .maxlen = sizeof(int),
149 .mode = 0644,
150 .proc_handler = proc_dointvec
151 },
152#ifdef CONFIG_RPS
153 {
154 .procname = "rps_sock_flow_entries",
155 .maxlen = sizeof(int),
156 .mode = 0644,
157 .proc_handler = rps_sock_flow_sysctl
158 },
159#endif
160#endif
161 {
162 .procname = "netdev_budget",
163 .data = &netdev_budget,
164 .maxlen = sizeof(int),
165 .mode = 0644,
166 .proc_handler = proc_dointvec
167 },
168 {
169 .procname = "warnings",
170 .data = &net_msg_warn,
171 .maxlen = sizeof(int),
172 .mode = 0644,
173 .proc_handler = proc_dointvec
174 },
175 { }
176};
177
178static struct ctl_table netns_core_table[] = {
179 {
180 .procname = "somaxconn",
181 .data = &init_net.core.sysctl_somaxconn,
182 .maxlen = sizeof(int),
183 .mode = 0644,
184 .proc_handler = proc_dointvec
185 },
186 { }
187};
188
189__net_initdata struct ctl_path net_core_path[] = {
190 { .procname = "net", },
191 { .procname = "core", },
192 { },
193};
194
195static __net_init int sysctl_core_net_init(struct net *net)
196{
197 struct ctl_table *tbl;
198
199 net->core.sysctl_somaxconn = SOMAXCONN;
200
201 tbl = netns_core_table;
202 if (!net_eq(net, &init_net)) {
203 tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL);
204 if (tbl == NULL)
205 goto err_dup;
206
207 tbl[0].data = &net->core.sysctl_somaxconn;
208 }
209
210 net->core.sysctl_hdr = register_net_sysctl_table(net,
211 net_core_path, tbl);
212 if (net->core.sysctl_hdr == NULL)
213 goto err_reg;
214
215 return 0;
216
217err_reg:
218 if (tbl != netns_core_table)
219 kfree(tbl);
220err_dup:
221 return -ENOMEM;
222}
223
224static __net_exit void sysctl_core_net_exit(struct net *net)
225{
226 struct ctl_table *tbl;
227
228 tbl = net->core.sysctl_hdr->ctl_table_arg;
229 unregister_net_sysctl_table(net->core.sysctl_hdr);
230 BUG_ON(tbl == netns_core_table);
231 kfree(tbl);
232}
233
234static __net_initdata struct pernet_operations sysctl_core_ops = {
235 .init = sysctl_core_net_init,
236 .exit = sysctl_core_net_exit,
237};
238
239static __init int sysctl_core_init(void)
240{
241 static struct ctl_table empty[1];
242
243 register_sysctl_paths(net_core_path, empty);
244 register_net_sysctl_rotable(net_core_path, net_core_table);
245 return register_pernet_subsys(&sysctl_core_ops);
246}
247
248fs_initcall(sysctl_core_init);
249
