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1 | /* -*- linux-c -*- |
2 | * sysctl_net_core.c: sysctl interface to net core subsystem. |
3 | * |
4 | * Begun April 1, 1996, Mike Shaver. |
5 | * Added /proc/sys/net/core directory entry (empty =) ). [MS] |
6 | */ |
7 | |
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 |
22 | static 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 | /* Enforce limit to prevent overflow */ |
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 /* CONFIG_RPS */ |
79 | |
80 | static 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 /* CONFIG_NET */ |
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 | |
178 | static 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 | |
195 | static __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 | |
217 | err_reg: |
218 | if (tbl != netns_core_table) |
219 | kfree(tbl); |
220 | err_dup: |
221 | return -ENOMEM; |
222 | } |
223 | |
224 | static __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 | |
234 | static __net_initdata struct pernet_operations sysctl_core_ops = { |
235 | .init = sysctl_core_net_init, |
236 | .exit = sysctl_core_net_exit, |
237 | }; |
238 | |
239 | static __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 | |
248 | fs_initcall(sysctl_core_init); |
249 |
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