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1da177e4 LT |
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> | |
1da177e4 | 10 | #include <linux/module.h> |
20380731 | 11 | #include <linux/socket.h> |
a37ae408 | 12 | #include <linux/netdevice.h> |
3fff4c42 | 13 | #include <linux/ratelimit.h> |
fec5e652 | 14 | #include <linux/vmalloc.h> |
33eb9cfc | 15 | #include <linux/init.h> |
5a0e3ad6 | 16 | #include <linux/slab.h> |
3fff4c42 | 17 | |
63d819ca | 18 | #include <net/ip.h> |
20380731 | 19 | #include <net/sock.h> |
c5c177b4 | 20 | #include <net/net_ratelimit.h> |
1da177e4 | 21 | |
fec5e652 TH |
22 | #ifdef CONFIG_RPS |
23 | static int rps_sock_flow_sysctl(ctl_table *table, int write, | |
24 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
25 | { | |
26 | unsigned int orig_size, size; | |
27 | int ret, i; | |
28 | ctl_table tmp = { | |
29 | .data = &size, | |
30 | .maxlen = sizeof(size), | |
31 | .mode = table->mode | |
32 | }; | |
33 | struct rps_sock_flow_table *orig_sock_table, *sock_table; | |
34 | static DEFINE_MUTEX(sock_flow_mutex); | |
35 | ||
36 | mutex_lock(&sock_flow_mutex); | |
37 | ||
6e3f7faf ED |
38 | orig_sock_table = rcu_dereference_protected(rps_sock_flow_table, |
39 | lockdep_is_held(&sock_flow_mutex)); | |
fec5e652 TH |
40 | size = orig_size = orig_sock_table ? orig_sock_table->mask + 1 : 0; |
41 | ||
42 | ret = proc_dointvec(&tmp, write, buffer, lenp, ppos); | |
43 | ||
44 | if (write) { | |
45 | if (size) { | |
46 | if (size > 1<<30) { | |
47 | /* Enforce limit to prevent overflow */ | |
48 | mutex_unlock(&sock_flow_mutex); | |
49 | return -EINVAL; | |
50 | } | |
51 | size = roundup_pow_of_two(size); | |
52 | if (size != orig_size) { | |
53 | sock_table = | |
54 | vmalloc(RPS_SOCK_FLOW_TABLE_SIZE(size)); | |
55 | if (!sock_table) { | |
56 | mutex_unlock(&sock_flow_mutex); | |
57 | return -ENOMEM; | |
58 | } | |
59 | ||
60 | sock_table->mask = size - 1; | |
61 | } else | |
62 | sock_table = orig_sock_table; | |
63 | ||
64 | for (i = 0; i < size; i++) | |
65 | sock_table->ents[i] = RPS_NO_CPU; | |
66 | } else | |
67 | sock_table = NULL; | |
68 | ||
69 | if (sock_table != orig_sock_table) { | |
70 | rcu_assign_pointer(rps_sock_flow_table, sock_table); | |
71 | synchronize_rcu(); | |
72 | vfree(orig_sock_table); | |
73 | } | |
74 | } | |
75 | ||
76 | mutex_unlock(&sock_flow_mutex); | |
77 | ||
78 | return ret; | |
79 | } | |
80 | #endif /* CONFIG_RPS */ | |
81 | ||
33eb9cfc | 82 | static struct ctl_table net_core_table[] = { |
1da177e4 LT |
83 | #ifdef CONFIG_NET |
84 | { | |
1da177e4 LT |
85 | .procname = "wmem_max", |
86 | .data = &sysctl_wmem_max, | |
87 | .maxlen = sizeof(int), | |
88 | .mode = 0644, | |
6d9f239a | 89 | .proc_handler = proc_dointvec |
1da177e4 LT |
90 | }, |
91 | { | |
1da177e4 LT |
92 | .procname = "rmem_max", |
93 | .data = &sysctl_rmem_max, | |
94 | .maxlen = sizeof(int), | |
95 | .mode = 0644, | |
6d9f239a | 96 | .proc_handler = proc_dointvec |
1da177e4 LT |
97 | }, |
98 | { | |
1da177e4 LT |
99 | .procname = "wmem_default", |
100 | .data = &sysctl_wmem_default, | |
101 | .maxlen = sizeof(int), | |
102 | .mode = 0644, | |
6d9f239a | 103 | .proc_handler = proc_dointvec |
1da177e4 LT |
104 | }, |
105 | { | |
1da177e4 LT |
106 | .procname = "rmem_default", |
107 | .data = &sysctl_rmem_default, | |
108 | .maxlen = sizeof(int), | |
109 | .mode = 0644, | |
6d9f239a | 110 | .proc_handler = proc_dointvec |
1da177e4 LT |
111 | }, |
112 | { | |
1da177e4 LT |
113 | .procname = "dev_weight", |
114 | .data = &weight_p, | |
115 | .maxlen = sizeof(int), | |
116 | .mode = 0644, | |
6d9f239a | 117 | .proc_handler = proc_dointvec |
1da177e4 LT |
118 | }, |
119 | { | |
1da177e4 LT |
120 | .procname = "netdev_max_backlog", |
121 | .data = &netdev_max_backlog, | |
122 | .maxlen = sizeof(int), | |
123 | .mode = 0644, | |
6d9f239a | 124 | .proc_handler = proc_dointvec |
1da177e4 | 125 | }, |
0a14842f ED |
126 | #ifdef CONFIG_BPF_JIT |
127 | { | |
128 | .procname = "bpf_jit_enable", | |
129 | .data = &bpf_jit_enable, | |
130 | .maxlen = sizeof(int), | |
131 | .mode = 0644, | |
132 | .proc_handler = proc_dointvec | |
133 | }, | |
134 | #endif | |
3b098e2d ED |
135 | { |
136 | .procname = "netdev_tstamp_prequeue", | |
137 | .data = &netdev_tstamp_prequeue, | |
138 | .maxlen = sizeof(int), | |
139 | .mode = 0644, | |
140 | .proc_handler = proc_dointvec | |
141 | }, | |
1da177e4 | 142 | { |
1da177e4 | 143 | .procname = "message_cost", |
717115e1 | 144 | .data = &net_ratelimit_state.interval, |
1da177e4 LT |
145 | .maxlen = sizeof(int), |
146 | .mode = 0644, | |
6d9f239a | 147 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
148 | }, |
149 | { | |
1da177e4 | 150 | .procname = "message_burst", |
717115e1 | 151 | .data = &net_ratelimit_state.burst, |
1da177e4 LT |
152 | .maxlen = sizeof(int), |
153 | .mode = 0644, | |
6d9f239a | 154 | .proc_handler = proc_dointvec, |
1da177e4 LT |
155 | }, |
156 | { | |
1da177e4 LT |
157 | .procname = "optmem_max", |
158 | .data = &sysctl_optmem_max, | |
159 | .maxlen = sizeof(int), | |
160 | .mode = 0644, | |
6d9f239a | 161 | .proc_handler = proc_dointvec |
1da177e4 | 162 | }, |
fec5e652 TH |
163 | #ifdef CONFIG_RPS |
164 | { | |
165 | .procname = "rps_sock_flow_entries", | |
166 | .maxlen = sizeof(int), | |
167 | .mode = 0644, | |
168 | .proc_handler = rps_sock_flow_sysctl | |
169 | }, | |
170 | #endif | |
1da177e4 | 171 | #endif /* CONFIG_NET */ |
51b0bded | 172 | { |
51b0bded SH |
173 | .procname = "netdev_budget", |
174 | .data = &netdev_budget, | |
175 | .maxlen = sizeof(int), | |
176 | .mode = 0644, | |
6d9f239a | 177 | .proc_handler = proc_dointvec |
51b0bded | 178 | }, |
a2a316fd | 179 | { |
a2a316fd SH |
180 | .procname = "warnings", |
181 | .data = &net_msg_warn, | |
182 | .maxlen = sizeof(int), | |
183 | .mode = 0644, | |
6d9f239a | 184 | .proc_handler = proc_dointvec |
a2a316fd | 185 | }, |
f8572d8f | 186 | { } |
1da177e4 | 187 | }; |
33eb9cfc | 188 | |
d5a4502e PE |
189 | static struct ctl_table netns_core_table[] = { |
190 | { | |
d5a4502e PE |
191 | .procname = "somaxconn", |
192 | .data = &init_net.core.sysctl_somaxconn, | |
193 | .maxlen = sizeof(int), | |
194 | .mode = 0644, | |
6d9f239a | 195 | .proc_handler = proc_dointvec |
d5a4502e | 196 | }, |
f8572d8f | 197 | { } |
d5a4502e PE |
198 | }; |
199 | ||
b27aeadb | 200 | __net_initdata struct ctl_path net_core_path[] = { |
f8572d8f EB |
201 | { .procname = "net", }, |
202 | { .procname = "core", }, | |
33eb9cfc PE |
203 | { }, |
204 | }; | |
205 | ||
024626e3 | 206 | static __net_init int sysctl_core_net_init(struct net *net) |
33eb9cfc | 207 | { |
d5a4502e | 208 | struct ctl_table *tbl; |
024626e3 | 209 | |
8efa6e93 | 210 | net->core.sysctl_somaxconn = SOMAXCONN; |
b8e1f9b5 | 211 | |
d5a4502e | 212 | tbl = netns_core_table; |
09ad9bc7 | 213 | if (!net_eq(net, &init_net)) { |
d5a4502e | 214 | tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL); |
024626e3 PE |
215 | if (tbl == NULL) |
216 | goto err_dup; | |
217 | ||
d5a4502e | 218 | tbl[0].data = &net->core.sysctl_somaxconn; |
024626e3 PE |
219 | } |
220 | ||
8efa6e93 | 221 | net->core.sysctl_hdr = register_net_sysctl_table(net, |
024626e3 | 222 | net_core_path, tbl); |
8efa6e93 | 223 | if (net->core.sysctl_hdr == NULL) |
024626e3 | 224 | goto err_reg; |
33eb9cfc | 225 | |
024626e3 PE |
226 | return 0; |
227 | ||
228 | err_reg: | |
d5a4502e | 229 | if (tbl != netns_core_table) |
024626e3 PE |
230 | kfree(tbl); |
231 | err_dup: | |
232 | return -ENOMEM; | |
233 | } | |
234 | ||
235 | static __net_exit void sysctl_core_net_exit(struct net *net) | |
236 | { | |
237 | struct ctl_table *tbl; | |
238 | ||
8efa6e93 PE |
239 | tbl = net->core.sysctl_hdr->ctl_table_arg; |
240 | unregister_net_sysctl_table(net->core.sysctl_hdr); | |
d5a4502e | 241 | BUG_ON(tbl == netns_core_table); |
024626e3 PE |
242 | kfree(tbl); |
243 | } | |
244 | ||
245 | static __net_initdata struct pernet_operations sysctl_core_ops = { | |
246 | .init = sysctl_core_net_init, | |
247 | .exit = sysctl_core_net_exit, | |
248 | }; | |
249 | ||
250 | static __init int sysctl_core_init(void) | |
251 | { | |
b27aeadb AD |
252 | static struct ctl_table empty[1]; |
253 | ||
254 | register_sysctl_paths(net_core_path, empty); | |
d5a4502e | 255 | register_net_sysctl_rotable(net_core_path, net_core_table); |
024626e3 | 256 | return register_pernet_subsys(&sysctl_core_ops); |
33eb9cfc PE |
257 | } |
258 | ||
b27aeadb | 259 | fs_initcall(sysctl_core_init); |