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
__xfrm_sysctl_init(struct net * net)7 static 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
16 static 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
xfrm_sysctl_init(struct net * net)44 int __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
71 out_register:
72 kfree(table);
73 out_kmemdup:
74 return -ENOMEM;
75 }
76
xfrm_sysctl_fini(struct net * net)77 void __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
xfrm_sysctl_init(struct net * net)86 int __net_init xfrm_sysctl_init(struct net *net)
87 {
88 __xfrm_sysctl_init(net);
89 return 0;
90 }
91 #endif
92