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 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 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 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 86 int __net_init xfrm_sysctl_init(struct net *net) 87 { 88 __xfrm_sysctl_init(net); 89 return 0; 90 } 91 #endif 92