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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); | |
adc9300e | 71 | if (sock_table) |
c5905afb | 72 | static_key_slow_inc(&rps_needed); |
adc9300e | 73 | if (orig_sock_table) { |
c5905afb | 74 | static_key_slow_dec(&rps_needed); |
adc9300e ED |
75 | synchronize_rcu(); |
76 | vfree(orig_sock_table); | |
77 | } | |
fec5e652 TH |
78 | } |
79 | } | |
80 | ||
81 | mutex_unlock(&sock_flow_mutex); | |
82 | ||
83 | return ret; | |
84 | } | |
85 | #endif /* CONFIG_RPS */ | |
86 | ||
33eb9cfc | 87 | static struct ctl_table net_core_table[] = { |
1da177e4 LT |
88 | #ifdef CONFIG_NET |
89 | { | |
1da177e4 LT |
90 | .procname = "wmem_max", |
91 | .data = &sysctl_wmem_max, | |
92 | .maxlen = sizeof(int), | |
93 | .mode = 0644, | |
6d9f239a | 94 | .proc_handler = proc_dointvec |
1da177e4 LT |
95 | }, |
96 | { | |
1da177e4 LT |
97 | .procname = "rmem_max", |
98 | .data = &sysctl_rmem_max, | |
99 | .maxlen = sizeof(int), | |
100 | .mode = 0644, | |
6d9f239a | 101 | .proc_handler = proc_dointvec |
1da177e4 LT |
102 | }, |
103 | { | |
1da177e4 LT |
104 | .procname = "wmem_default", |
105 | .data = &sysctl_wmem_default, | |
106 | .maxlen = sizeof(int), | |
107 | .mode = 0644, | |
6d9f239a | 108 | .proc_handler = proc_dointvec |
1da177e4 LT |
109 | }, |
110 | { | |
1da177e4 LT |
111 | .procname = "rmem_default", |
112 | .data = &sysctl_rmem_default, | |
113 | .maxlen = sizeof(int), | |
114 | .mode = 0644, | |
6d9f239a | 115 | .proc_handler = proc_dointvec |
1da177e4 LT |
116 | }, |
117 | { | |
1da177e4 LT |
118 | .procname = "dev_weight", |
119 | .data = &weight_p, | |
120 | .maxlen = sizeof(int), | |
121 | .mode = 0644, | |
6d9f239a | 122 | .proc_handler = proc_dointvec |
1da177e4 LT |
123 | }, |
124 | { | |
1da177e4 LT |
125 | .procname = "netdev_max_backlog", |
126 | .data = &netdev_max_backlog, | |
127 | .maxlen = sizeof(int), | |
128 | .mode = 0644, | |
6d9f239a | 129 | .proc_handler = proc_dointvec |
1da177e4 | 130 | }, |
0a14842f ED |
131 | #ifdef CONFIG_BPF_JIT |
132 | { | |
133 | .procname = "bpf_jit_enable", | |
134 | .data = &bpf_jit_enable, | |
135 | .maxlen = sizeof(int), | |
136 | .mode = 0644, | |
137 | .proc_handler = proc_dointvec | |
138 | }, | |
139 | #endif | |
3b098e2d ED |
140 | { |
141 | .procname = "netdev_tstamp_prequeue", | |
142 | .data = &netdev_tstamp_prequeue, | |
143 | .maxlen = sizeof(int), | |
144 | .mode = 0644, | |
145 | .proc_handler = proc_dointvec | |
146 | }, | |
1da177e4 | 147 | { |
1da177e4 | 148 | .procname = "message_cost", |
717115e1 | 149 | .data = &net_ratelimit_state.interval, |
1da177e4 LT |
150 | .maxlen = sizeof(int), |
151 | .mode = 0644, | |
6d9f239a | 152 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
153 | }, |
154 | { | |
1da177e4 | 155 | .procname = "message_burst", |
717115e1 | 156 | .data = &net_ratelimit_state.burst, |
1da177e4 LT |
157 | .maxlen = sizeof(int), |
158 | .mode = 0644, | |
6d9f239a | 159 | .proc_handler = proc_dointvec, |
1da177e4 LT |
160 | }, |
161 | { | |
1da177e4 LT |
162 | .procname = "optmem_max", |
163 | .data = &sysctl_optmem_max, | |
164 | .maxlen = sizeof(int), | |
165 | .mode = 0644, | |
6d9f239a | 166 | .proc_handler = proc_dointvec |
1da177e4 | 167 | }, |
fec5e652 TH |
168 | #ifdef CONFIG_RPS |
169 | { | |
170 | .procname = "rps_sock_flow_entries", | |
171 | .maxlen = sizeof(int), | |
172 | .mode = 0644, | |
173 | .proc_handler = rps_sock_flow_sysctl | |
174 | }, | |
175 | #endif | |
1da177e4 | 176 | #endif /* CONFIG_NET */ |
51b0bded | 177 | { |
51b0bded SH |
178 | .procname = "netdev_budget", |
179 | .data = &netdev_budget, | |
180 | .maxlen = sizeof(int), | |
181 | .mode = 0644, | |
6d9f239a | 182 | .proc_handler = proc_dointvec |
51b0bded | 183 | }, |
a2a316fd | 184 | { |
a2a316fd SH |
185 | .procname = "warnings", |
186 | .data = &net_msg_warn, | |
187 | .maxlen = sizeof(int), | |
188 | .mode = 0644, | |
6d9f239a | 189 | .proc_handler = proc_dointvec |
a2a316fd | 190 | }, |
f8572d8f | 191 | { } |
1da177e4 | 192 | }; |
33eb9cfc | 193 | |
d5a4502e PE |
194 | static struct ctl_table netns_core_table[] = { |
195 | { | |
d5a4502e PE |
196 | .procname = "somaxconn", |
197 | .data = &init_net.core.sysctl_somaxconn, | |
198 | .maxlen = sizeof(int), | |
199 | .mode = 0644, | |
6d9f239a | 200 | .proc_handler = proc_dointvec |
d5a4502e | 201 | }, |
f8572d8f | 202 | { } |
d5a4502e PE |
203 | }; |
204 | ||
b27aeadb | 205 | __net_initdata struct ctl_path net_core_path[] = { |
f8572d8f EB |
206 | { .procname = "net", }, |
207 | { .procname = "core", }, | |
33eb9cfc PE |
208 | { }, |
209 | }; | |
210 | ||
024626e3 | 211 | static __net_init int sysctl_core_net_init(struct net *net) |
33eb9cfc | 212 | { |
d5a4502e | 213 | struct ctl_table *tbl; |
024626e3 | 214 | |
8efa6e93 | 215 | net->core.sysctl_somaxconn = SOMAXCONN; |
b8e1f9b5 | 216 | |
d5a4502e | 217 | tbl = netns_core_table; |
09ad9bc7 | 218 | if (!net_eq(net, &init_net)) { |
d5a4502e | 219 | tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL); |
024626e3 PE |
220 | if (tbl == NULL) |
221 | goto err_dup; | |
222 | ||
d5a4502e | 223 | tbl[0].data = &net->core.sysctl_somaxconn; |
024626e3 PE |
224 | } |
225 | ||
8efa6e93 | 226 | net->core.sysctl_hdr = register_net_sysctl_table(net, |
024626e3 | 227 | net_core_path, tbl); |
8efa6e93 | 228 | if (net->core.sysctl_hdr == NULL) |
024626e3 | 229 | goto err_reg; |
33eb9cfc | 230 | |
024626e3 PE |
231 | return 0; |
232 | ||
233 | err_reg: | |
d5a4502e | 234 | if (tbl != netns_core_table) |
024626e3 PE |
235 | kfree(tbl); |
236 | err_dup: | |
237 | return -ENOMEM; | |
238 | } | |
239 | ||
240 | static __net_exit void sysctl_core_net_exit(struct net *net) | |
241 | { | |
242 | struct ctl_table *tbl; | |
243 | ||
8efa6e93 PE |
244 | tbl = net->core.sysctl_hdr->ctl_table_arg; |
245 | unregister_net_sysctl_table(net->core.sysctl_hdr); | |
d5a4502e | 246 | BUG_ON(tbl == netns_core_table); |
024626e3 PE |
247 | kfree(tbl); |
248 | } | |
249 | ||
250 | static __net_initdata struct pernet_operations sysctl_core_ops = { | |
251 | .init = sysctl_core_net_init, | |
252 | .exit = sysctl_core_net_exit, | |
253 | }; | |
254 | ||
255 | static __init int sysctl_core_init(void) | |
256 | { | |
b27aeadb AD |
257 | static struct ctl_table empty[1]; |
258 | ||
259 | register_sysctl_paths(net_core_path, empty); | |
d5a4502e | 260 | register_net_sysctl_rotable(net_core_path, net_core_table); |
024626e3 | 261 | return register_pernet_subsys(&sysctl_core_ops); |
33eb9cfc PE |
262 | } |
263 | ||
b27aeadb | 264 | fs_initcall(sysctl_core_init); |