1// SPDX-License-Identifier: GPL-2.0
2#include <linux/sysctl.h>
3#include <linux/slab.h>
4#include <net/net_namespace.h>
5#include <net/xfrm.h>
6
7static void __net_init __xfrm_sysctl_init(struct net *net)
8{
9	net->xfrm.sysctl_aevent_etime = XFRM_AE_ETIME;
10	net->xfrm.sysctl_aevent_rseqth = XFRM_AE_SEQT_SIZE;
11	net->xfrm.sysctl_larval_drop = 1;
12	net->xfrm.sysctl_acq_expires = 30;
13}
14
15#ifdef CONFIG_SYSCTL
16static struct ctl_table xfrm_table[] = {
17	{
18		.procname	= "xfrm_aevent_etime",
19		.maxlen		= sizeof(u32),
20		.mode		= 0644,
21		.proc_handler	= proc_douintvec
22	},
23	{
24		.procname	= "xfrm_aevent_rseqth",
25		.maxlen		= sizeof(u32),
26		.mode		= 0644,
27		.proc_handler	= proc_douintvec
28	},
29	{
30		.procname	= "xfrm_larval_drop",
31		.maxlen		= sizeof(int),
32		.mode		= 0644,
33		.proc_handler	= proc_dointvec
34	},
35	{
36		.procname	= "xfrm_acq_expires",
37		.maxlen		= sizeof(int),
38		.mode		= 0644,
39		.proc_handler	= proc_dointvec
40	},
41	{}
42};
43
44int __net_init xfrm_sysctl_init(struct net *net)
45{
46	struct ctl_table *table;
47	size_t table_size = ARRAY_SIZE(xfrm_table);
48
49	__xfrm_sysctl_init(net);
50
51	table = kmemdup(xfrm_table, sizeof(xfrm_table), GFP_KERNEL);
52	if (!table)
53		goto out_kmemdup;
54	table[0].data = &net->xfrm.sysctl_aevent_etime;
55	table[1].data = &net->xfrm.sysctl_aevent_rseqth;
56	table[2].data = &net->xfrm.sysctl_larval_drop;
57	table[3].data = &net->xfrm.sysctl_acq_expires;
58
59	/* Don't export sysctls to unprivileged users */
60	if (net->user_ns != &init_user_ns) {
61		table[0].procname = NULL;
62		table_size = 0;
63	}
64
65	net->xfrm.sysctl_hdr = register_net_sysctl_sz(net, "net/core", table,
66						      table_size);
67	if (!net->xfrm.sysctl_hdr)
68		goto out_register;
69	return 0;
70
71out_register:
72	kfree(table);
73out_kmemdup:
74	return -ENOMEM;
75}
76
77void __net_exit xfrm_sysctl_fini(struct net *net)
78{
79	struct ctl_table *table;
80
81	table = net->xfrm.sysctl_hdr->ctl_table_arg;
82	unregister_net_sysctl_table(net->xfrm.sysctl_hdr);
83	kfree(table);
84}
85#else
86int __net_init xfrm_sysctl_init(struct net *net)
87{
88	__xfrm_sysctl_init(net);
89	return 0;
90}
91#endif
92