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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> |
7426a564 | 17 | #include <linux/kmemleak.h> |
3fff4c42 | 18 | |
63d819ca | 19 | #include <net/ip.h> |
20380731 | 20 | #include <net/sock.h> |
c5c177b4 | 21 | #include <net/net_ratelimit.h> |
1da177e4 | 22 | |
cdda8891 | 23 | static int one = 1; |
24 | ||
fec5e652 TH |
25 | #ifdef CONFIG_RPS |
26 | static int rps_sock_flow_sysctl(ctl_table *table, int write, | |
27 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
28 | { | |
29 | unsigned int orig_size, size; | |
30 | int ret, i; | |
31 | ctl_table tmp = { | |
32 | .data = &size, | |
33 | .maxlen = sizeof(size), | |
34 | .mode = table->mode | |
35 | }; | |
36 | struct rps_sock_flow_table *orig_sock_table, *sock_table; | |
37 | static DEFINE_MUTEX(sock_flow_mutex); | |
38 | ||
39 | mutex_lock(&sock_flow_mutex); | |
40 | ||
6e3f7faf ED |
41 | orig_sock_table = rcu_dereference_protected(rps_sock_flow_table, |
42 | lockdep_is_held(&sock_flow_mutex)); | |
fec5e652 TH |
43 | size = orig_size = orig_sock_table ? orig_sock_table->mask + 1 : 0; |
44 | ||
45 | ret = proc_dointvec(&tmp, write, buffer, lenp, ppos); | |
46 | ||
47 | if (write) { | |
48 | if (size) { | |
49 | if (size > 1<<30) { | |
50 | /* Enforce limit to prevent overflow */ | |
51 | mutex_unlock(&sock_flow_mutex); | |
52 | return -EINVAL; | |
53 | } | |
54 | size = roundup_pow_of_two(size); | |
55 | if (size != orig_size) { | |
56 | sock_table = | |
57 | vmalloc(RPS_SOCK_FLOW_TABLE_SIZE(size)); | |
58 | if (!sock_table) { | |
59 | mutex_unlock(&sock_flow_mutex); | |
60 | return -ENOMEM; | |
61 | } | |
62 | ||
63 | sock_table->mask = size - 1; | |
64 | } else | |
65 | sock_table = orig_sock_table; | |
66 | ||
67 | for (i = 0; i < size; i++) | |
68 | sock_table->ents[i] = RPS_NO_CPU; | |
69 | } else | |
70 | sock_table = NULL; | |
71 | ||
72 | if (sock_table != orig_sock_table) { | |
73 | rcu_assign_pointer(rps_sock_flow_table, sock_table); | |
adc9300e | 74 | if (sock_table) |
c5905afb | 75 | static_key_slow_inc(&rps_needed); |
adc9300e | 76 | if (orig_sock_table) { |
c5905afb | 77 | static_key_slow_dec(&rps_needed); |
adc9300e ED |
78 | synchronize_rcu(); |
79 | vfree(orig_sock_table); | |
80 | } | |
fec5e652 TH |
81 | } |
82 | } | |
83 | ||
84 | mutex_unlock(&sock_flow_mutex); | |
85 | ||
86 | return ret; | |
87 | } | |
88 | #endif /* CONFIG_RPS */ | |
89 | ||
33eb9cfc | 90 | static struct ctl_table net_core_table[] = { |
1da177e4 LT |
91 | #ifdef CONFIG_NET |
92 | { | |
1da177e4 LT |
93 | .procname = "wmem_max", |
94 | .data = &sysctl_wmem_max, | |
95 | .maxlen = sizeof(int), | |
96 | .mode = 0644, | |
cdda8891 | 97 | .proc_handler = proc_dointvec_minmax, |
98 | .extra1 = &one, | |
1da177e4 LT |
99 | }, |
100 | { | |
1da177e4 LT |
101 | .procname = "rmem_max", |
102 | .data = &sysctl_rmem_max, | |
103 | .maxlen = sizeof(int), | |
104 | .mode = 0644, | |
cdda8891 | 105 | .proc_handler = proc_dointvec_minmax, |
106 | .extra1 = &one, | |
1da177e4 LT |
107 | }, |
108 | { | |
1da177e4 LT |
109 | .procname = "wmem_default", |
110 | .data = &sysctl_wmem_default, | |
111 | .maxlen = sizeof(int), | |
112 | .mode = 0644, | |
cdda8891 | 113 | .proc_handler = proc_dointvec_minmax, |
114 | .extra1 = &one, | |
1da177e4 LT |
115 | }, |
116 | { | |
1da177e4 LT |
117 | .procname = "rmem_default", |
118 | .data = &sysctl_rmem_default, | |
119 | .maxlen = sizeof(int), | |
120 | .mode = 0644, | |
cdda8891 | 121 | .proc_handler = proc_dointvec_minmax, |
122 | .extra1 = &one, | |
1da177e4 LT |
123 | }, |
124 | { | |
1da177e4 LT |
125 | .procname = "dev_weight", |
126 | .data = &weight_p, | |
127 | .maxlen = sizeof(int), | |
128 | .mode = 0644, | |
6d9f239a | 129 | .proc_handler = proc_dointvec |
1da177e4 LT |
130 | }, |
131 | { | |
1da177e4 LT |
132 | .procname = "netdev_max_backlog", |
133 | .data = &netdev_max_backlog, | |
134 | .maxlen = sizeof(int), | |
135 | .mode = 0644, | |
6d9f239a | 136 | .proc_handler = proc_dointvec |
1da177e4 | 137 | }, |
0a14842f ED |
138 | #ifdef CONFIG_BPF_JIT |
139 | { | |
140 | .procname = "bpf_jit_enable", | |
141 | .data = &bpf_jit_enable, | |
142 | .maxlen = sizeof(int), | |
143 | .mode = 0644, | |
144 | .proc_handler = proc_dointvec | |
145 | }, | |
146 | #endif | |
3b098e2d ED |
147 | { |
148 | .procname = "netdev_tstamp_prequeue", | |
149 | .data = &netdev_tstamp_prequeue, | |
150 | .maxlen = sizeof(int), | |
151 | .mode = 0644, | |
152 | .proc_handler = proc_dointvec | |
153 | }, | |
1da177e4 | 154 | { |
1da177e4 | 155 | .procname = "message_cost", |
717115e1 | 156 | .data = &net_ratelimit_state.interval, |
1da177e4 LT |
157 | .maxlen = sizeof(int), |
158 | .mode = 0644, | |
6d9f239a | 159 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
160 | }, |
161 | { | |
1da177e4 | 162 | .procname = "message_burst", |
717115e1 | 163 | .data = &net_ratelimit_state.burst, |
1da177e4 LT |
164 | .maxlen = sizeof(int), |
165 | .mode = 0644, | |
6d9f239a | 166 | .proc_handler = proc_dointvec, |
1da177e4 LT |
167 | }, |
168 | { | |
1da177e4 LT |
169 | .procname = "optmem_max", |
170 | .data = &sysctl_optmem_max, | |
171 | .maxlen = sizeof(int), | |
172 | .mode = 0644, | |
6d9f239a | 173 | .proc_handler = proc_dointvec |
1da177e4 | 174 | }, |
fec5e652 TH |
175 | #ifdef CONFIG_RPS |
176 | { | |
177 | .procname = "rps_sock_flow_entries", | |
178 | .maxlen = sizeof(int), | |
179 | .mode = 0644, | |
180 | .proc_handler = rps_sock_flow_sysctl | |
181 | }, | |
182 | #endif | |
1da177e4 | 183 | #endif /* CONFIG_NET */ |
51b0bded | 184 | { |
51b0bded SH |
185 | .procname = "netdev_budget", |
186 | .data = &netdev_budget, | |
187 | .maxlen = sizeof(int), | |
188 | .mode = 0644, | |
6d9f239a | 189 | .proc_handler = proc_dointvec |
51b0bded | 190 | }, |
a2a316fd | 191 | { |
a2a316fd SH |
192 | .procname = "warnings", |
193 | .data = &net_msg_warn, | |
194 | .maxlen = sizeof(int), | |
195 | .mode = 0644, | |
6d9f239a | 196 | .proc_handler = proc_dointvec |
a2a316fd | 197 | }, |
f8572d8f | 198 | { } |
1da177e4 | 199 | }; |
33eb9cfc | 200 | |
d5a4502e PE |
201 | static struct ctl_table netns_core_table[] = { |
202 | { | |
d5a4502e PE |
203 | .procname = "somaxconn", |
204 | .data = &init_net.core.sysctl_somaxconn, | |
205 | .maxlen = sizeof(int), | |
206 | .mode = 0644, | |
6d9f239a | 207 | .proc_handler = proc_dointvec |
d5a4502e | 208 | }, |
f8572d8f | 209 | { } |
d5a4502e PE |
210 | }; |
211 | ||
024626e3 | 212 | static __net_init int sysctl_core_net_init(struct net *net) |
33eb9cfc | 213 | { |
d5a4502e | 214 | struct ctl_table *tbl; |
024626e3 | 215 | |
8efa6e93 | 216 | net->core.sysctl_somaxconn = SOMAXCONN; |
b8e1f9b5 | 217 | |
d5a4502e | 218 | tbl = netns_core_table; |
09ad9bc7 | 219 | if (!net_eq(net, &init_net)) { |
d5a4502e | 220 | tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL); |
024626e3 PE |
221 | if (tbl == NULL) |
222 | goto err_dup; | |
223 | ||
d5a4502e | 224 | tbl[0].data = &net->core.sysctl_somaxconn; |
464dc801 EB |
225 | |
226 | /* Don't export any sysctls to unprivileged users */ | |
227 | if (net->user_ns != &init_user_ns) { | |
228 | tbl[0].procname = NULL; | |
229 | } | |
024626e3 PE |
230 | } |
231 | ||
ec8f23ce | 232 | net->core.sysctl_hdr = register_net_sysctl(net, "net/core", tbl); |
8efa6e93 | 233 | if (net->core.sysctl_hdr == NULL) |
024626e3 | 234 | goto err_reg; |
33eb9cfc | 235 | |
024626e3 PE |
236 | return 0; |
237 | ||
238 | err_reg: | |
d5a4502e | 239 | if (tbl != netns_core_table) |
024626e3 PE |
240 | kfree(tbl); |
241 | err_dup: | |
242 | return -ENOMEM; | |
243 | } | |
244 | ||
245 | static __net_exit void sysctl_core_net_exit(struct net *net) | |
246 | { | |
247 | struct ctl_table *tbl; | |
248 | ||
8efa6e93 PE |
249 | tbl = net->core.sysctl_hdr->ctl_table_arg; |
250 | unregister_net_sysctl_table(net->core.sysctl_hdr); | |
d5a4502e | 251 | BUG_ON(tbl == netns_core_table); |
024626e3 PE |
252 | kfree(tbl); |
253 | } | |
254 | ||
255 | static __net_initdata struct pernet_operations sysctl_core_ops = { | |
256 | .init = sysctl_core_net_init, | |
257 | .exit = sysctl_core_net_exit, | |
258 | }; | |
259 | ||
260 | static __init int sysctl_core_init(void) | |
261 | { | |
43444757 | 262 | register_net_sysctl(&init_net, "net/core", net_core_table); |
024626e3 | 263 | return register_pernet_subsys(&sysctl_core_ops); |
33eb9cfc PE |
264 | } |
265 | ||
b27aeadb | 266 | fs_initcall(sysctl_core_init); |