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v3.15
 
  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
 25static int zero = 0;
 26static int one = 1;
 27static int ushort_max = USHRT_MAX;
 
 
 
 
 
 
 
 
 28
 29#ifdef CONFIG_RPS
 30static 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
 95static DEFINE_MUTEX(flow_limit_update_mutex);
 96
 97static 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		}
136write_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
171done:
172	free_cpumask_var(mask);
173	return ret;
174}
175
176static 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
199static 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
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
218static 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
367static 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
380static __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
406err_reg:
407	if (tbl != netns_core_table)
408		kfree(tbl);
409err_dup:
410	return -ENOMEM;
411}
412
413static __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
423static __net_initdata struct pernet_operations sysctl_core_ops = {
424	.init = sysctl_core_net_init,
425	.exit = sysctl_core_net_exit,
426};
427
428static __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
434fs_initcall(sysctl_core_init);
v4.17
  1// SPDX-License-Identifier: GPL-2.0
  2/* -*- linux-c -*-
  3 * sysctl_net_core.c: sysctl interface to net core subsystem.
  4 *
  5 * Begun April 1, 1996, Mike Shaver.
  6 * Added /proc/sys/net/core directory entry (empty =) ). [MS]
  7 */
  8
  9#include <linux/mm.h>
 10#include <linux/sysctl.h>
 11#include <linux/module.h>
 12#include <linux/socket.h>
 13#include <linux/netdevice.h>
 14#include <linux/ratelimit.h>
 15#include <linux/vmalloc.h>
 16#include <linux/init.h>
 17#include <linux/slab.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
 25static int zero = 0;
 26static int one = 1;
 27static int two __maybe_unused = 2;
 28static int min_sndbuf = SOCK_MIN_SNDBUF;
 29static int min_rcvbuf = SOCK_MIN_RCVBUF;
 30static int max_skb_frags = MAX_SKB_FRAGS;
 31
 32static int net_msg_warn;	/* Unused, but still a sysctl */
 33
 34int sysctl_fb_tunnels_only_for_init_net __read_mostly = 0;
 35EXPORT_SYMBOL(sysctl_fb_tunnels_only_for_init_net);
 36
 37#ifdef CONFIG_RPS
 38static int rps_sock_flow_sysctl(struct ctl_table *table, int write,
 39				void __user *buffer, size_t *lenp, loff_t *ppos)
 40{
 41	unsigned int orig_size, size;
 42	int ret, i;
 43	struct ctl_table tmp = {
 44		.data = &size,
 45		.maxlen = sizeof(size),
 46		.mode = table->mode
 47	};
 48	struct rps_sock_flow_table *orig_sock_table, *sock_table;
 49	static DEFINE_MUTEX(sock_flow_mutex);
 50
 51	mutex_lock(&sock_flow_mutex);
 52
 53	orig_sock_table = rcu_dereference_protected(rps_sock_flow_table,
 54					lockdep_is_held(&sock_flow_mutex));
 55	size = orig_size = orig_sock_table ? orig_sock_table->mask + 1 : 0;
 56
 57	ret = proc_dointvec(&tmp, write, buffer, lenp, ppos);
 58
 59	if (write) {
 60		if (size) {
 61			if (size > 1<<29) {
 62				/* Enforce limit to prevent overflow */
 63				mutex_unlock(&sock_flow_mutex);
 64				return -EINVAL;
 65			}
 66			size = roundup_pow_of_two(size);
 67			if (size != orig_size) {
 68				sock_table =
 69				    vmalloc(RPS_SOCK_FLOW_TABLE_SIZE(size));
 70				if (!sock_table) {
 71					mutex_unlock(&sock_flow_mutex);
 72					return -ENOMEM;
 73				}
 74				rps_cpu_mask = roundup_pow_of_two(nr_cpu_ids) - 1;
 75				sock_table->mask = size - 1;
 76			} else
 77				sock_table = orig_sock_table;
 78
 79			for (i = 0; i < size; i++)
 80				sock_table->ents[i] = RPS_NO_CPU;
 81		} else
 82			sock_table = NULL;
 83
 84		if (sock_table != orig_sock_table) {
 85			rcu_assign_pointer(rps_sock_flow_table, sock_table);
 86			if (sock_table) {
 87				static_key_slow_inc(&rps_needed);
 88				static_key_slow_inc(&rfs_needed);
 89			}
 90			if (orig_sock_table) {
 91				static_key_slow_dec(&rps_needed);
 92				static_key_slow_dec(&rfs_needed);
 93				synchronize_rcu();
 94				vfree(orig_sock_table);
 95			}
 96		}
 97	}
 98
 99	mutex_unlock(&sock_flow_mutex);
100
101	return ret;
102}
103#endif /* CONFIG_RPS */
104
105#ifdef CONFIG_NET_FLOW_LIMIT
106static DEFINE_MUTEX(flow_limit_update_mutex);
107
108static int flow_limit_cpu_sysctl(struct ctl_table *table, int write,
109				 void __user *buffer, size_t *lenp,
110				 loff_t *ppos)
111{
112	struct sd_flow_limit *cur;
113	struct softnet_data *sd;
114	cpumask_var_t mask;
115	int i, len, ret = 0;
116
117	if (!alloc_cpumask_var(&mask, GFP_KERNEL))
118		return -ENOMEM;
119
120	if (write) {
121		ret = cpumask_parse_user(buffer, *lenp, mask);
122		if (ret)
123			goto done;
124
125		mutex_lock(&flow_limit_update_mutex);
126		len = sizeof(*cur) + netdev_flow_limit_table_len;
127		for_each_possible_cpu(i) {
128			sd = &per_cpu(softnet_data, i);
129			cur = rcu_dereference_protected(sd->flow_limit,
130				     lockdep_is_held(&flow_limit_update_mutex));
131			if (cur && !cpumask_test_cpu(i, mask)) {
132				RCU_INIT_POINTER(sd->flow_limit, NULL);
133				synchronize_rcu();
134				kfree(cur);
135			} else if (!cur && cpumask_test_cpu(i, mask)) {
136				cur = kzalloc_node(len, GFP_KERNEL,
137						   cpu_to_node(i));
138				if (!cur) {
139					/* not unwinding previous changes */
140					ret = -ENOMEM;
141					goto write_unlock;
142				}
143				cur->num_buckets = netdev_flow_limit_table_len;
144				rcu_assign_pointer(sd->flow_limit, cur);
145			}
146		}
147write_unlock:
148		mutex_unlock(&flow_limit_update_mutex);
149	} else {
150		char kbuf[128];
151
152		if (*ppos || !*lenp) {
153			*lenp = 0;
154			goto done;
155		}
156
157		cpumask_clear(mask);
158		rcu_read_lock();
159		for_each_possible_cpu(i) {
160			sd = &per_cpu(softnet_data, i);
161			if (rcu_dereference(sd->flow_limit))
162				cpumask_set_cpu(i, mask);
163		}
164		rcu_read_unlock();
165
166		len = min(sizeof(kbuf) - 1, *lenp);
167		len = scnprintf(kbuf, len, "%*pb", cpumask_pr_args(mask));
168		if (!len) {
169			*lenp = 0;
170			goto done;
171		}
172		if (len < *lenp)
173			kbuf[len++] = '\n';
174		if (copy_to_user(buffer, kbuf, len)) {
175			ret = -EFAULT;
176			goto done;
177		}
178		*lenp = len;
179		*ppos += len;
180	}
181
182done:
183	free_cpumask_var(mask);
184	return ret;
185}
186
187static int flow_limit_table_len_sysctl(struct ctl_table *table, int write,
188				       void __user *buffer, size_t *lenp,
189				       loff_t *ppos)
190{
191	unsigned int old, *ptr;
192	int ret;
193
194	mutex_lock(&flow_limit_update_mutex);
195
196	ptr = table->data;
197	old = *ptr;
198	ret = proc_dointvec(table, write, buffer, lenp, ppos);
199	if (!ret && write && !is_power_of_2(*ptr)) {
200		*ptr = old;
201		ret = -EINVAL;
202	}
203
204	mutex_unlock(&flow_limit_update_mutex);
205	return ret;
206}
207#endif /* CONFIG_NET_FLOW_LIMIT */
208
209#ifdef CONFIG_NET_SCHED
210static int set_default_qdisc(struct ctl_table *table, int write,
211			     void __user *buffer, size_t *lenp, loff_t *ppos)
212{
213	char id[IFNAMSIZ];
214	struct ctl_table tbl = {
215		.data = id,
216		.maxlen = IFNAMSIZ,
217	};
218	int ret;
219
220	qdisc_get_default(id, IFNAMSIZ);
221
222	ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
223	if (write && ret == 0)
224		ret = qdisc_set_default(id);
225	return ret;
226}
227#endif
228
229static int proc_do_dev_weight(struct ctl_table *table, int write,
230			   void __user *buffer, size_t *lenp, loff_t *ppos)
231{
232	int ret;
233
234	ret = proc_dointvec(table, write, buffer, lenp, ppos);
235	if (ret != 0)
236		return ret;
237
238	dev_rx_weight = weight_p * dev_weight_rx_bias;
239	dev_tx_weight = weight_p * dev_weight_tx_bias;
240
241	return ret;
242}
243
244static int proc_do_rss_key(struct ctl_table *table, int write,
245			   void __user *buffer, size_t *lenp, loff_t *ppos)
246{
247	struct ctl_table fake_table;
248	char buf[NETDEV_RSS_KEY_LEN * 3];
249
250	snprintf(buf, sizeof(buf), "%*phC", NETDEV_RSS_KEY_LEN, netdev_rss_key);
251	fake_table.data = buf;
252	fake_table.maxlen = sizeof(buf);
253	return proc_dostring(&fake_table, write, buffer, lenp, ppos);
254}
255
256#ifdef CONFIG_BPF_JIT
257static int proc_dointvec_minmax_bpf_enable(struct ctl_table *table, int write,
258					   void __user *buffer, size_t *lenp,
259					   loff_t *ppos)
260{
261	int ret, jit_enable = *(int *)table->data;
262	struct ctl_table tmp = *table;
263
264	if (write && !capable(CAP_SYS_ADMIN))
265		return -EPERM;
266
267	tmp.data = &jit_enable;
268	ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
269	if (write && !ret) {
270		if (jit_enable < 2 ||
271		    (jit_enable == 2 && bpf_dump_raw_ok())) {
272			*(int *)table->data = jit_enable;
273			if (jit_enable == 2)
274				pr_warn("bpf_jit_enable = 2 was set! NEVER use this in production, only for JIT debugging!\n");
275		} else {
276			ret = -EPERM;
277		}
278	}
279	return ret;
280}
281
282# ifdef CONFIG_HAVE_EBPF_JIT
283static int
284proc_dointvec_minmax_bpf_restricted(struct ctl_table *table, int write,
285				    void __user *buffer, size_t *lenp,
286				    loff_t *ppos)
287{
288	if (!capable(CAP_SYS_ADMIN))
289		return -EPERM;
290
291	return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
292}
293# endif
294#endif
295
296static struct ctl_table net_core_table[] = {
297#ifdef CONFIG_NET
298	{
299		.procname	= "wmem_max",
300		.data		= &sysctl_wmem_max,
301		.maxlen		= sizeof(int),
302		.mode		= 0644,
303		.proc_handler	= proc_dointvec_minmax,
304		.extra1		= &min_sndbuf,
305	},
306	{
307		.procname	= "rmem_max",
308		.data		= &sysctl_rmem_max,
309		.maxlen		= sizeof(int),
310		.mode		= 0644,
311		.proc_handler	= proc_dointvec_minmax,
312		.extra1		= &min_rcvbuf,
313	},
314	{
315		.procname	= "wmem_default",
316		.data		= &sysctl_wmem_default,
317		.maxlen		= sizeof(int),
318		.mode		= 0644,
319		.proc_handler	= proc_dointvec_minmax,
320		.extra1		= &min_sndbuf,
321	},
322	{
323		.procname	= "rmem_default",
324		.data		= &sysctl_rmem_default,
325		.maxlen		= sizeof(int),
326		.mode		= 0644,
327		.proc_handler	= proc_dointvec_minmax,
328		.extra1		= &min_rcvbuf,
329	},
330	{
331		.procname	= "dev_weight",
332		.data		= &weight_p,
333		.maxlen		= sizeof(int),
334		.mode		= 0644,
335		.proc_handler	= proc_do_dev_weight,
336	},
337	{
338		.procname	= "dev_weight_rx_bias",
339		.data		= &dev_weight_rx_bias,
340		.maxlen		= sizeof(int),
341		.mode		= 0644,
342		.proc_handler	= proc_do_dev_weight,
343	},
344	{
345		.procname	= "dev_weight_tx_bias",
346		.data		= &dev_weight_tx_bias,
347		.maxlen		= sizeof(int),
348		.mode		= 0644,
349		.proc_handler	= proc_do_dev_weight,
350	},
351	{
352		.procname	= "netdev_max_backlog",
353		.data		= &netdev_max_backlog,
354		.maxlen		= sizeof(int),
355		.mode		= 0644,
356		.proc_handler	= proc_dointvec
357	},
358	{
359		.procname	= "netdev_rss_key",
360		.data		= &netdev_rss_key,
361		.maxlen		= sizeof(int),
362		.mode		= 0444,
363		.proc_handler	= proc_do_rss_key,
364	},
365#ifdef CONFIG_BPF_JIT
366	{
367		.procname	= "bpf_jit_enable",
368		.data		= &bpf_jit_enable,
369		.maxlen		= sizeof(int),
370		.mode		= 0644,
371		.proc_handler	= proc_dointvec_minmax_bpf_enable,
372# ifdef CONFIG_BPF_JIT_ALWAYS_ON
373		.extra1		= &one,
374		.extra2		= &one,
375# else
376		.extra1		= &zero,
377		.extra2		= &two,
378# endif
379	},
380# ifdef CONFIG_HAVE_EBPF_JIT
381	{
382		.procname	= "bpf_jit_harden",
383		.data		= &bpf_jit_harden,
384		.maxlen		= sizeof(int),
385		.mode		= 0600,
386		.proc_handler	= proc_dointvec_minmax_bpf_restricted,
387		.extra1		= &zero,
388		.extra2		= &two,
389	},
390	{
391		.procname	= "bpf_jit_kallsyms",
392		.data		= &bpf_jit_kallsyms,
393		.maxlen		= sizeof(int),
394		.mode		= 0600,
395		.proc_handler	= proc_dointvec_minmax_bpf_restricted,
396		.extra1		= &zero,
397		.extra2		= &one,
398	},
399# endif
400#endif
401	{
402		.procname	= "netdev_tstamp_prequeue",
403		.data		= &netdev_tstamp_prequeue,
404		.maxlen		= sizeof(int),
405		.mode		= 0644,
406		.proc_handler	= proc_dointvec
407	},
408	{
409		.procname	= "message_cost",
410		.data		= &net_ratelimit_state.interval,
411		.maxlen		= sizeof(int),
412		.mode		= 0644,
413		.proc_handler	= proc_dointvec_jiffies,
414	},
415	{
416		.procname	= "message_burst",
417		.data		= &net_ratelimit_state.burst,
418		.maxlen		= sizeof(int),
419		.mode		= 0644,
420		.proc_handler	= proc_dointvec,
421	},
422	{
423		.procname	= "optmem_max",
424		.data		= &sysctl_optmem_max,
425		.maxlen		= sizeof(int),
426		.mode		= 0644,
427		.proc_handler	= proc_dointvec
428	},
429	{
430		.procname	= "tstamp_allow_data",
431		.data		= &sysctl_tstamp_allow_data,
432		.maxlen		= sizeof(int),
433		.mode		= 0644,
434		.proc_handler	= proc_dointvec_minmax,
435		.extra1		= &zero,
436		.extra2		= &one
437	},
438#ifdef CONFIG_RPS
439	{
440		.procname	= "rps_sock_flow_entries",
441		.maxlen		= sizeof(int),
442		.mode		= 0644,
443		.proc_handler	= rps_sock_flow_sysctl
444	},
445#endif
446#ifdef CONFIG_NET_FLOW_LIMIT
447	{
448		.procname	= "flow_limit_cpu_bitmap",
449		.mode		= 0644,
450		.proc_handler	= flow_limit_cpu_sysctl
451	},
452	{
453		.procname	= "flow_limit_table_len",
454		.data		= &netdev_flow_limit_table_len,
455		.maxlen		= sizeof(int),
456		.mode		= 0644,
457		.proc_handler	= flow_limit_table_len_sysctl
458	},
459#endif /* CONFIG_NET_FLOW_LIMIT */
460#ifdef CONFIG_NET_RX_BUSY_POLL
461	{
462		.procname	= "busy_poll",
463		.data		= &sysctl_net_busy_poll,
464		.maxlen		= sizeof(unsigned int),
465		.mode		= 0644,
466		.proc_handler	= proc_dointvec_minmax,
467		.extra1		= &zero,
468	},
469	{
470		.procname	= "busy_read",
471		.data		= &sysctl_net_busy_read,
472		.maxlen		= sizeof(unsigned int),
473		.mode		= 0644,
474		.proc_handler	= proc_dointvec_minmax,
475		.extra1		= &zero,
476	},
477#endif
478#ifdef CONFIG_NET_SCHED
479	{
480		.procname	= "default_qdisc",
481		.mode		= 0644,
482		.maxlen		= IFNAMSIZ,
483		.proc_handler	= set_default_qdisc
484	},
485#endif
486#endif /* CONFIG_NET */
487	{
488		.procname	= "netdev_budget",
489		.data		= &netdev_budget,
490		.maxlen		= sizeof(int),
491		.mode		= 0644,
492		.proc_handler	= proc_dointvec
493	},
494	{
495		.procname	= "warnings",
496		.data		= &net_msg_warn,
497		.maxlen		= sizeof(int),
498		.mode		= 0644,
499		.proc_handler	= proc_dointvec
500	},
501	{
502		.procname	= "max_skb_frags",
503		.data		= &sysctl_max_skb_frags,
504		.maxlen		= sizeof(int),
505		.mode		= 0644,
506		.proc_handler	= proc_dointvec_minmax,
507		.extra1		= &one,
508		.extra2		= &max_skb_frags,
509	},
510	{
511		.procname	= "netdev_budget_usecs",
512		.data		= &netdev_budget_usecs,
513		.maxlen		= sizeof(unsigned int),
514		.mode		= 0644,
515		.proc_handler	= proc_dointvec_minmax,
516		.extra1		= &zero,
517	},
518	{
519		.procname	= "fb_tunnels_only_for_init_net",
520		.data		= &sysctl_fb_tunnels_only_for_init_net,
521		.maxlen		= sizeof(int),
522		.mode		= 0644,
523		.proc_handler	= proc_dointvec_minmax,
524		.extra1		= &zero,
525		.extra2		= &one,
526	},
527	{ }
528};
529
530static struct ctl_table netns_core_table[] = {
531	{
532		.procname	= "somaxconn",
533		.data		= &init_net.core.sysctl_somaxconn,
534		.maxlen		= sizeof(int),
535		.mode		= 0644,
536		.extra1		= &zero,
 
537		.proc_handler	= proc_dointvec_minmax
538	},
539	{ }
540};
541
542static __net_init int sysctl_core_net_init(struct net *net)
543{
544	struct ctl_table *tbl;
 
 
545
546	tbl = netns_core_table;
547	if (!net_eq(net, &init_net)) {
548		tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL);
549		if (tbl == NULL)
550			goto err_dup;
551
552		tbl[0].data = &net->core.sysctl_somaxconn;
553
554		/* Don't export any sysctls to unprivileged users */
555		if (net->user_ns != &init_user_ns) {
556			tbl[0].procname = NULL;
557		}
558	}
559
560	net->core.sysctl_hdr = register_net_sysctl(net, "net/core", tbl);
561	if (net->core.sysctl_hdr == NULL)
562		goto err_reg;
563
564	return 0;
565
566err_reg:
567	if (tbl != netns_core_table)
568		kfree(tbl);
569err_dup:
570	return -ENOMEM;
571}
572
573static __net_exit void sysctl_core_net_exit(struct net *net)
574{
575	struct ctl_table *tbl;
576
577	tbl = net->core.sysctl_hdr->ctl_table_arg;
578	unregister_net_sysctl_table(net->core.sysctl_hdr);
579	BUG_ON(tbl == netns_core_table);
580	kfree(tbl);
581}
582
583static __net_initdata struct pernet_operations sysctl_core_ops = {
584	.init = sysctl_core_net_init,
585	.exit = sysctl_core_net_exit,
586};
587
588static __init int sysctl_core_init(void)
589{
590	register_net_sysctl(&init_net, "net/core", net_core_table);
591	return register_pernet_subsys(&sysctl_core_ops);
592}
593
594fs_initcall(sysctl_core_init);