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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 | |
fec5e652 TH |
23 | #ifdef CONFIG_RPS |
24 | static int rps_sock_flow_sysctl(ctl_table *table, int write, | |
25 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
26 | { | |
27 | unsigned int orig_size, size; | |
28 | int ret, i; | |
29 | ctl_table tmp = { | |
30 | .data = &size, | |
31 | .maxlen = sizeof(size), | |
32 | .mode = table->mode | |
33 | }; | |
34 | struct rps_sock_flow_table *orig_sock_table, *sock_table; | |
35 | static DEFINE_MUTEX(sock_flow_mutex); | |
36 | ||
37 | mutex_lock(&sock_flow_mutex); | |
38 | ||
6e3f7faf ED |
39 | orig_sock_table = rcu_dereference_protected(rps_sock_flow_table, |
40 | lockdep_is_held(&sock_flow_mutex)); | |
fec5e652 TH |
41 | size = orig_size = orig_sock_table ? orig_sock_table->mask + 1 : 0; |
42 | ||
43 | ret = proc_dointvec(&tmp, write, buffer, lenp, ppos); | |
44 | ||
45 | if (write) { | |
46 | if (size) { | |
47 | if (size > 1<<30) { | |
48 | /* Enforce limit to prevent overflow */ | |
49 | mutex_unlock(&sock_flow_mutex); | |
50 | return -EINVAL; | |
51 | } | |
52 | size = roundup_pow_of_two(size); | |
53 | if (size != orig_size) { | |
54 | sock_table = | |
55 | vmalloc(RPS_SOCK_FLOW_TABLE_SIZE(size)); | |
56 | if (!sock_table) { | |
57 | mutex_unlock(&sock_flow_mutex); | |
58 | return -ENOMEM; | |
59 | } | |
60 | ||
61 | sock_table->mask = size - 1; | |
62 | } else | |
63 | sock_table = orig_sock_table; | |
64 | ||
65 | for (i = 0; i < size; i++) | |
66 | sock_table->ents[i] = RPS_NO_CPU; | |
67 | } else | |
68 | sock_table = NULL; | |
69 | ||
70 | if (sock_table != orig_sock_table) { | |
71 | rcu_assign_pointer(rps_sock_flow_table, sock_table); | |
adc9300e | 72 | if (sock_table) |
c5905afb | 73 | static_key_slow_inc(&rps_needed); |
adc9300e | 74 | if (orig_sock_table) { |
c5905afb | 75 | static_key_slow_dec(&rps_needed); |
adc9300e ED |
76 | synchronize_rcu(); |
77 | vfree(orig_sock_table); | |
78 | } | |
fec5e652 TH |
79 | } |
80 | } | |
81 | ||
82 | mutex_unlock(&sock_flow_mutex); | |
83 | ||
84 | return ret; | |
85 | } | |
86 | #endif /* CONFIG_RPS */ | |
87 | ||
33eb9cfc | 88 | static struct ctl_table net_core_table[] = { |
1da177e4 LT |
89 | #ifdef CONFIG_NET |
90 | { | |
1da177e4 LT |
91 | .procname = "wmem_max", |
92 | .data = &sysctl_wmem_max, | |
93 | .maxlen = sizeof(int), | |
94 | .mode = 0644, | |
6d9f239a | 95 | .proc_handler = proc_dointvec |
1da177e4 LT |
96 | }, |
97 | { | |
1da177e4 LT |
98 | .procname = "rmem_max", |
99 | .data = &sysctl_rmem_max, | |
100 | .maxlen = sizeof(int), | |
101 | .mode = 0644, | |
6d9f239a | 102 | .proc_handler = proc_dointvec |
1da177e4 LT |
103 | }, |
104 | { | |
1da177e4 LT |
105 | .procname = "wmem_default", |
106 | .data = &sysctl_wmem_default, | |
107 | .maxlen = sizeof(int), | |
108 | .mode = 0644, | |
6d9f239a | 109 | .proc_handler = proc_dointvec |
1da177e4 LT |
110 | }, |
111 | { | |
1da177e4 LT |
112 | .procname = "rmem_default", |
113 | .data = &sysctl_rmem_default, | |
114 | .maxlen = sizeof(int), | |
115 | .mode = 0644, | |
6d9f239a | 116 | .proc_handler = proc_dointvec |
1da177e4 LT |
117 | }, |
118 | { | |
1da177e4 LT |
119 | .procname = "dev_weight", |
120 | .data = &weight_p, | |
121 | .maxlen = sizeof(int), | |
122 | .mode = 0644, | |
6d9f239a | 123 | .proc_handler = proc_dointvec |
1da177e4 LT |
124 | }, |
125 | { | |
1da177e4 LT |
126 | .procname = "netdev_max_backlog", |
127 | .data = &netdev_max_backlog, | |
128 | .maxlen = sizeof(int), | |
129 | .mode = 0644, | |
6d9f239a | 130 | .proc_handler = proc_dointvec |
1da177e4 | 131 | }, |
0a14842f ED |
132 | #ifdef CONFIG_BPF_JIT |
133 | { | |
134 | .procname = "bpf_jit_enable", | |
135 | .data = &bpf_jit_enable, | |
136 | .maxlen = sizeof(int), | |
137 | .mode = 0644, | |
138 | .proc_handler = proc_dointvec | |
139 | }, | |
140 | #endif | |
3b098e2d ED |
141 | { |
142 | .procname = "netdev_tstamp_prequeue", | |
143 | .data = &netdev_tstamp_prequeue, | |
144 | .maxlen = sizeof(int), | |
145 | .mode = 0644, | |
146 | .proc_handler = proc_dointvec | |
147 | }, | |
1da177e4 | 148 | { |
1da177e4 | 149 | .procname = "message_cost", |
717115e1 | 150 | .data = &net_ratelimit_state.interval, |
1da177e4 LT |
151 | .maxlen = sizeof(int), |
152 | .mode = 0644, | |
6d9f239a | 153 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
154 | }, |
155 | { | |
1da177e4 | 156 | .procname = "message_burst", |
717115e1 | 157 | .data = &net_ratelimit_state.burst, |
1da177e4 LT |
158 | .maxlen = sizeof(int), |
159 | .mode = 0644, | |
6d9f239a | 160 | .proc_handler = proc_dointvec, |
1da177e4 LT |
161 | }, |
162 | { | |
1da177e4 LT |
163 | .procname = "optmem_max", |
164 | .data = &sysctl_optmem_max, | |
165 | .maxlen = sizeof(int), | |
166 | .mode = 0644, | |
6d9f239a | 167 | .proc_handler = proc_dointvec |
1da177e4 | 168 | }, |
fec5e652 TH |
169 | #ifdef CONFIG_RPS |
170 | { | |
171 | .procname = "rps_sock_flow_entries", | |
172 | .maxlen = sizeof(int), | |
173 | .mode = 0644, | |
174 | .proc_handler = rps_sock_flow_sysctl | |
175 | }, | |
176 | #endif | |
1da177e4 | 177 | #endif /* CONFIG_NET */ |
51b0bded | 178 | { |
51b0bded SH |
179 | .procname = "netdev_budget", |
180 | .data = &netdev_budget, | |
181 | .maxlen = sizeof(int), | |
182 | .mode = 0644, | |
6d9f239a | 183 | .proc_handler = proc_dointvec |
51b0bded | 184 | }, |
a2a316fd | 185 | { |
a2a316fd SH |
186 | .procname = "warnings", |
187 | .data = &net_msg_warn, | |
188 | .maxlen = sizeof(int), | |
189 | .mode = 0644, | |
6d9f239a | 190 | .proc_handler = proc_dointvec |
a2a316fd | 191 | }, |
f8572d8f | 192 | { } |
1da177e4 | 193 | }; |
33eb9cfc | 194 | |
d5a4502e PE |
195 | static struct ctl_table netns_core_table[] = { |
196 | { | |
d5a4502e PE |
197 | .procname = "somaxconn", |
198 | .data = &init_net.core.sysctl_somaxconn, | |
199 | .maxlen = sizeof(int), | |
200 | .mode = 0644, | |
6d9f239a | 201 | .proc_handler = proc_dointvec |
d5a4502e | 202 | }, |
f8572d8f | 203 | { } |
d5a4502e PE |
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 | ||
ec8f23ce | 221 | net->core.sysctl_hdr = register_net_sysctl(net, "net/core", tbl); |
8efa6e93 | 222 | if (net->core.sysctl_hdr == NULL) |
024626e3 | 223 | goto err_reg; |
33eb9cfc | 224 | |
024626e3 PE |
225 | return 0; |
226 | ||
227 | err_reg: | |
d5a4502e | 228 | if (tbl != netns_core_table) |
024626e3 PE |
229 | kfree(tbl); |
230 | err_dup: | |
231 | return -ENOMEM; | |
232 | } | |
233 | ||
234 | static __net_exit void sysctl_core_net_exit(struct net *net) | |
235 | { | |
236 | struct ctl_table *tbl; | |
237 | ||
8efa6e93 PE |
238 | tbl = net->core.sysctl_hdr->ctl_table_arg; |
239 | unregister_net_sysctl_table(net->core.sysctl_hdr); | |
d5a4502e | 240 | BUG_ON(tbl == netns_core_table); |
024626e3 PE |
241 | kfree(tbl); |
242 | } | |
243 | ||
244 | static __net_initdata struct pernet_operations sysctl_core_ops = { | |
245 | .init = sysctl_core_net_init, | |
246 | .exit = sysctl_core_net_exit, | |
247 | }; | |
248 | ||
249 | static __init int sysctl_core_init(void) | |
250 | { | |
43444757 | 251 | register_net_sysctl(&init_net, "net/core", net_core_table); |
024626e3 | 252 | return register_pernet_subsys(&sysctl_core_ops); |
33eb9cfc PE |
253 | } |
254 | ||
b27aeadb | 255 | fs_initcall(sysctl_core_init); |