net/xfrm/xfrm_sysctl.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 #include <linux/sysctl.h>
0003 #include <linux/slab.h>
0004 #include <net/net_namespace.h>
0005 #include <net/xfrm.h>
0006
0007 static void __net_init __xfrm_sysctl_init(struct net *net)
0008 {
0009     net->xfrm.sysctl_aevent_etime = XFRM_AE_ETIME;
0010     net->xfrm.sysctl_aevent_rseqth = XFRM_AE_SEQT_SIZE;
0011     net->xfrm.sysctl_larval_drop = 1;
0012     net->xfrm.sysctl_acq_expires = 30;
0013 }
0014
0015 #ifdef CONFIG_SYSCTL
0016 static struct ctl_table xfrm_table[] = {
0017     {
0018         .procname   = "xfrm_aevent_etime",
0019         .maxlen     = sizeof(u32),
0020         .mode       = 0644,
0021         .proc_handler   = proc_douintvec
0022     },
0023     {
0024         .procname   = "xfrm_aevent_rseqth",
0025         .maxlen     = sizeof(u32),
0026         .mode       = 0644,
0027         .proc_handler   = proc_douintvec
0028     },
0029     {
0030         .procname   = "xfrm_larval_drop",
0031         .maxlen     = sizeof(int),
0032         .mode       = 0644,
0033         .proc_handler   = proc_dointvec
0034     },
0035     {
0036         .procname   = "xfrm_acq_expires",
0037         .maxlen     = sizeof(int),
0038         .mode       = 0644,
0039         .proc_handler   = proc_dointvec
0040     },
0041     {}
0042 };
0043
0044 int __net_init xfrm_sysctl_init(struct net *net)
0045 {
0046     struct ctl_table *table;
0047
0048     __xfrm_sysctl_init(net);
0049
0050     table = kmemdup(xfrm_table, sizeof(xfrm_table), GFP_KERNEL);
0051     if (!table)
0052         goto out_kmemdup;
0053     table[0].data = &net->xfrm.sysctl_aevent_etime;
0054     table[1].data = &net->xfrm.sysctl_aevent_rseqth;
0055     table[2].data = &net->xfrm.sysctl_larval_drop;
0056     table[3].data = &net->xfrm.sysctl_acq_expires;
0057
0058     /* Don't export sysctls to unprivileged users */
0059     if (net->user_ns != &init_user_ns)
0060         table[0].procname = NULL;
0061
0062     net->xfrm.sysctl_hdr = register_net_sysctl(net, "net/core", table);
0063     if (!net->xfrm.sysctl_hdr)
0064         goto out_register;
0065     return 0;
0066
0067 out_register:
0068     kfree(table);
0069 out_kmemdup:
0070     return -ENOMEM;
0071 }
0072
0073 void __net_exit xfrm_sysctl_fini(struct net *net)
0074 {
0075     struct ctl_table *table;
0076
0077     table = net->xfrm.sysctl_hdr->ctl_table_arg;
0078     unregister_net_sysctl_table(net->xfrm.sysctl_hdr);
0079     kfree(table);
0080 }
0081 #else
0082 int __net_init xfrm_sysctl_init(struct net *net)
0083 {
0084     __xfrm_sysctl_init(net);
0085     return 0;
0086 }
0087 #endif