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Linux/net/core/sysctl_net_core.c

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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 #include <linux/kmemleak.h>
 18 
 19 #include <net/ip.h>
 20 #include <net/sock.h>
 21 #include <net/net_ratelimit.h>
 22 #include <net/busy_poll.h>
 23 #include <net/pkt_sched.h>
 24 
 25 static int zero = 0;
 26 static int one = 1;
 27 static int ushort_max = USHRT_MAX;
 28 
 29 #ifdef CONFIG_RPS
 30 static int rps_sock_flow_sysctl(struct ctl_table *table, int write,
 31                                 void __user *buffer, size_t *lenp, loff_t *ppos)
 32 {
 33         unsigned int orig_size, size;
 34         int ret, i;
 35         struct ctl_table tmp = {
 36                 .data = &size,
 37                 .maxlen = sizeof(size),
 38                 .mode = table->mode
 39         };
 40         struct rps_sock_flow_table *orig_sock_table, *sock_table;
 41         static DEFINE_MUTEX(sock_flow_mutex);
 42 
 43         mutex_lock(&sock_flow_mutex);
 44 
 45         orig_sock_table = rcu_dereference_protected(rps_sock_flow_table,
 46                                         lockdep_is_held(&sock_flow_mutex));
 47         size = orig_size = orig_sock_table ? orig_sock_table->mask + 1 : 0;
 48 
 49         ret = proc_dointvec(&tmp, write, buffer, lenp, ppos);
 50 
 51         if (write) {
 52                 if (size) {
 53                         if (size > 1<<30) {
 54                                 /* Enforce limit to prevent overflow */
 55                                 mutex_unlock(&sock_flow_mutex);
 56                                 return -EINVAL;
 57                         }
 58                         size = roundup_pow_of_two(size);
 59                         if (size != orig_size) {
 60                                 sock_table =
 61                                     vmalloc(RPS_SOCK_FLOW_TABLE_SIZE(size));
 62                                 if (!sock_table) {
 63                                         mutex_unlock(&sock_flow_mutex);
 64                                         return -ENOMEM;
 65                                 }
 66 
 67                                 sock_table->mask = size - 1;
 68                         } else
 69                                 sock_table = orig_sock_table;
 70 
 71                         for (i = 0; i < size; i++)
 72                                 sock_table->ents[i] = RPS_NO_CPU;
 73                 } else
 74                         sock_table = NULL;
 75 
 76                 if (sock_table != orig_sock_table) {
 77                         rcu_assign_pointer(rps_sock_flow_table, sock_table);
 78                         if (sock_table)
 79                                 static_key_slow_inc(&rps_needed);
 80                         if (orig_sock_table) {
 81                                 static_key_slow_dec(&rps_needed);
 82                                 synchronize_rcu();
 83                                 vfree(orig_sock_table);
 84                         }
 85                 }
 86         }
 87 
 88         mutex_unlock(&sock_flow_mutex);
 89 
 90         return ret;
 91 }
 92 #endif /* CONFIG_RPS */
 93 
 94 #ifdef CONFIG_NET_FLOW_LIMIT
 95 static DEFINE_MUTEX(flow_limit_update_mutex);
 96 
 97 static int flow_limit_cpu_sysctl(struct ctl_table *table, int write,
 98                                  void __user *buffer, size_t *lenp,
 99                                  loff_t *ppos)
100 {
101         struct sd_flow_limit *cur;
102         struct softnet_data *sd;
103         cpumask_var_t mask;
104         int i, len, ret = 0;
105 
106         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
107                 return -ENOMEM;
108 
109         if (write) {
110                 ret = cpumask_parse_user(buffer, *lenp, mask);
111                 if (ret)
112                         goto done;
113 
114                 mutex_lock(&flow_limit_update_mutex);
115                 len = sizeof(*cur) + netdev_flow_limit_table_len;
116                 for_each_possible_cpu(i) {
117                         sd = &per_cpu(softnet_data, i);
118                         cur = rcu_dereference_protected(sd->flow_limit,
119                                      lockdep_is_held(&flow_limit_update_mutex));
120                         if (cur && !cpumask_test_cpu(i, mask)) {
121                                 RCU_INIT_POINTER(sd->flow_limit, NULL);
122                                 synchronize_rcu();
123                                 kfree(cur);
124                         } else if (!cur && cpumask_test_cpu(i, mask)) {
125                                 cur = kzalloc_node(len, GFP_KERNEL,
126                                                    cpu_to_node(i));
127                                 if (!cur) {
128                                         /* not unwinding previous changes */
129                                         ret = -ENOMEM;
130                                         goto write_unlock;
131                                 }
132                                 cur->num_buckets = netdev_flow_limit_table_len;
133                                 rcu_assign_pointer(sd->flow_limit, cur);
134                         }
135                 }
136 write_unlock:
137                 mutex_unlock(&flow_limit_update_mutex);
138         } else {
139                 char kbuf[128];
140 
141                 if (*ppos || !*lenp) {
142                         *lenp = 0;
143                         goto done;
144                 }
145 
146                 cpumask_clear(mask);
147                 rcu_read_lock();
148                 for_each_possible_cpu(i) {
149                         sd = &per_cpu(softnet_data, i);
150                         if (rcu_dereference(sd->flow_limit))
151                                 cpumask_set_cpu(i, mask);
152                 }
153                 rcu_read_unlock();
154 
155                 len = min(sizeof(kbuf) - 1, *lenp);
156                 len = cpumask_scnprintf(kbuf, len, mask);
157                 if (!len) {
158                         *lenp = 0;
159                         goto done;
160                 }
161                 if (len < *lenp)
162                         kbuf[len++] = '\n';
163                 if (copy_to_user(buffer, kbuf, len)) {
164                         ret = -EFAULT;
165                         goto done;
166                 }
167                 *lenp = len;
168                 *ppos += len;
169         }
170 
171 done:
172         free_cpumask_var(mask);
173         return ret;
174 }
175 
176 static int flow_limit_table_len_sysctl(struct ctl_table *table, int write,
177                                        void __user *buffer, size_t *lenp,
178                                        loff_t *ppos)
179 {
180         unsigned int old, *ptr;
181         int ret;
182 
183         mutex_lock(&flow_limit_update_mutex);
184 
185         ptr = table->data;
186         old = *ptr;
187         ret = proc_dointvec(table, write, buffer, lenp, ppos);
188         if (!ret && write && !is_power_of_2(*ptr)) {
189                 *ptr = old;
190                 ret = -EINVAL;
191         }
192 
193         mutex_unlock(&flow_limit_update_mutex);
194         return ret;
195 }
196 #endif /* CONFIG_NET_FLOW_LIMIT */
197 
198 #ifdef CONFIG_NET_SCHED
199 static int set_default_qdisc(struct ctl_table *table, int write,
200                              void __user *buffer, size_t *lenp, loff_t *ppos)
201 {
202         char id[IFNAMSIZ];
203         struct ctl_table tbl = {
204                 .data = id,
205                 .maxlen = IFNAMSIZ,
206         };
207         int ret;
208 
209         qdisc_get_default(id, IFNAMSIZ);
210 
211         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
212         if (write && ret == 0)
213                 ret = qdisc_set_default(id);
214         return ret;
215 }
216 #endif
217 
218 static struct ctl_table net_core_table[] = {
219 #ifdef CONFIG_NET
220         {
221                 .procname       = "wmem_max",
222                 .data           = &sysctl_wmem_max,
223                 .maxlen         = sizeof(int),
224                 .mode           = 0644,
225                 .proc_handler   = proc_dointvec_minmax,
226                 .extra1         = &one,
227         },
228         {
229                 .procname       = "rmem_max",
230                 .data           = &sysctl_rmem_max,
231                 .maxlen         = sizeof(int),
232                 .mode           = 0644,
233                 .proc_handler   = proc_dointvec_minmax,
234                 .extra1         = &one,
235         },
236         {
237                 .procname       = "wmem_default",
238                 .data           = &sysctl_wmem_default,
239                 .maxlen         = sizeof(int),
240                 .mode           = 0644,
241                 .proc_handler   = proc_dointvec_minmax,
242                 .extra1         = &one,
243         },
244         {
245                 .procname       = "rmem_default",
246                 .data           = &sysctl_rmem_default,
247                 .maxlen         = sizeof(int),
248                 .mode           = 0644,
249                 .proc_handler   = proc_dointvec_minmax,
250                 .extra1         = &one,
251         },
252         {
253                 .procname       = "dev_weight",
254                 .data           = &weight_p,
255                 .maxlen         = sizeof(int),
256                 .mode           = 0644,
257                 .proc_handler   = proc_dointvec
258         },
259         {
260                 .procname       = "netdev_max_backlog",
261                 .data           = &netdev_max_backlog,
262                 .maxlen         = sizeof(int),
263                 .mode           = 0644,
264                 .proc_handler   = proc_dointvec
265         },
266 #ifdef CONFIG_BPF_JIT
267         {
268                 .procname       = "bpf_jit_enable",
269                 .data           = &bpf_jit_enable,
270                 .maxlen         = sizeof(int),
271                 .mode           = 0644,
272                 .proc_handler   = proc_dointvec
273         },
274 #endif
275         {
276                 .procname       = "netdev_tstamp_prequeue",
277                 .data           = &netdev_tstamp_prequeue,
278                 .maxlen         = sizeof(int),
279                 .mode           = 0644,
280                 .proc_handler   = proc_dointvec
281         },
282         {
283                 .procname       = "message_cost",
284                 .data           = &net_ratelimit_state.interval,
285                 .maxlen         = sizeof(int),
286                 .mode           = 0644,
287                 .proc_handler   = proc_dointvec_jiffies,
288         },
289         {
290                 .procname       = "message_burst",
291                 .data           = &net_ratelimit_state.burst,
292                 .maxlen         = sizeof(int),
293                 .mode           = 0644,
294                 .proc_handler   = proc_dointvec,
295         },
296         {
297                 .procname       = "optmem_max",
298                 .data           = &sysctl_optmem_max,
299                 .maxlen         = sizeof(int),
300                 .mode           = 0644,
301                 .proc_handler   = proc_dointvec
302         },
303 #ifdef CONFIG_RPS
304         {
305                 .procname       = "rps_sock_flow_entries",
306                 .maxlen         = sizeof(int),
307                 .mode           = 0644,
308                 .proc_handler   = rps_sock_flow_sysctl
309         },
310 #endif
311 #ifdef CONFIG_NET_FLOW_LIMIT
312         {
313                 .procname       = "flow_limit_cpu_bitmap",
314                 .mode           = 0644,
315                 .proc_handler   = flow_limit_cpu_sysctl
316         },
317         {
318                 .procname       = "flow_limit_table_len",
319                 .data           = &netdev_flow_limit_table_len,
320                 .maxlen         = sizeof(int),
321                 .mode           = 0644,
322                 .proc_handler   = flow_limit_table_len_sysctl
323         },
324 #endif /* CONFIG_NET_FLOW_LIMIT */
325 #ifdef CONFIG_NET_RX_BUSY_POLL
326         {
327                 .procname       = "busy_poll",
328                 .data           = &sysctl_net_busy_poll,
329                 .maxlen         = sizeof(unsigned int),
330                 .mode           = 0644,
331                 .proc_handler   = proc_dointvec
332         },
333         {
334                 .procname       = "busy_read",
335                 .data           = &sysctl_net_busy_read,
336                 .maxlen         = sizeof(unsigned int),
337                 .mode           = 0644,
338                 .proc_handler   = proc_dointvec
339         },
340 #endif
341 #ifdef CONFIG_NET_SCHED
342         {
343                 .procname       = "default_qdisc",
344                 .mode           = 0644,
345                 .maxlen         = IFNAMSIZ,
346                 .proc_handler   = set_default_qdisc
347         },
348 #endif
349 #endif /* CONFIG_NET */
350         {
351                 .procname       = "netdev_budget",
352                 .data           = &netdev_budget,
353                 .maxlen         = sizeof(int),
354                 .mode           = 0644,
355                 .proc_handler   = proc_dointvec
356         },
357         {
358                 .procname       = "warnings",
359                 .data           = &net_msg_warn,
360                 .maxlen         = sizeof(int),
361                 .mode           = 0644,
362                 .proc_handler   = proc_dointvec
363         },
364         { }
365 };
366 
367 static struct ctl_table netns_core_table[] = {
368         {
369                 .procname       = "somaxconn",
370                 .data           = &init_net.core.sysctl_somaxconn,
371                 .maxlen         = sizeof(int),
372                 .mode           = 0644,
373                 .extra1         = &zero,
374                 .extra2         = &ushort_max,
375                 .proc_handler   = proc_dointvec_minmax
376         },
377         { }
378 };
379 
380 static __net_init int sysctl_core_net_init(struct net *net)
381 {
382         struct ctl_table *tbl;
383 
384         net->core.sysctl_somaxconn = SOMAXCONN;
385 
386         tbl = netns_core_table;
387         if (!net_eq(net, &init_net)) {
388                 tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL);
389                 if (tbl == NULL)
390                         goto err_dup;
391 
392                 tbl[0].data = &net->core.sysctl_somaxconn;
393 
394                 /* Don't export any sysctls to unprivileged users */
395                 if (net->user_ns != &init_user_ns) {
396                         tbl[0].procname = NULL;
397                 }
398         }
399 
400         net->core.sysctl_hdr = register_net_sysctl(net, "net/core", tbl);
401         if (net->core.sysctl_hdr == NULL)
402                 goto err_reg;
403 
404         return 0;
405 
406 err_reg:
407         if (tbl != netns_core_table)
408                 kfree(tbl);
409 err_dup:
410         return -ENOMEM;
411 }
412 
413 static __net_exit void sysctl_core_net_exit(struct net *net)
414 {
415         struct ctl_table *tbl;
416 
417         tbl = net->core.sysctl_hdr->ctl_table_arg;
418         unregister_net_sysctl_table(net->core.sysctl_hdr);
419         BUG_ON(tbl == netns_core_table);
420         kfree(tbl);
421 }
422 
423 static __net_initdata struct pernet_operations sysctl_core_ops = {
424         .init = sysctl_core_net_init,
425         .exit = sysctl_core_net_exit,
426 };
427 
428 static __init int sysctl_core_init(void)
429 {
430         register_net_sysctl(&init_net, "net/core", net_core_table);
431         return register_pernet_subsys(&sysctl_core_ops);
432 }
433 
434 fs_initcall(sysctl_core_init);
435 

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