1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * NET4: Sysctl interface to net af_unix subsystem. 4 * 5 * Authors: Mike Shaver. 6 */ 7 8 #include <linux/mm.h> 9 #include <linux/slab.h> 10 #include <linux/sysctl.h> 11 12 #include <net/af_unix.h> 13 14 static struct ctl_table unix_table[] = { 15 { 16 .procname = "max_dgram_qlen", 17 .data = &init_net.unx.sysctl_max_dgram_qlen, 18 .maxlen = sizeof(int), 19 .mode = 0644, 20 .proc_handler = proc_dointvec 21 }, 22 { } 23 }; 24 25 int __net_init unix_sysctl_register(struct net *net) 26 { 27 struct ctl_table *table; 28 29 table = kmemdup(unix_table, sizeof(unix_table), GFP_KERNEL); 30 if (table == NULL) 31 goto err_alloc; 32 33 /* Don't export sysctls to unprivileged users */ 34 if (net->user_ns != &init_user_ns) 35 table[0].procname = NULL; 36 37 table[0].data = &net->unx.sysctl_max_dgram_qlen; 38 net->unx.ctl = register_net_sysctl(net, "net/unix", table); 39 if (net->unx.ctl == NULL) 40 goto err_reg; 41 42 return 0; 43 44 err_reg: 45 kfree(table); 46 err_alloc: 47 return -ENOMEM; 48 } 49 50 void unix_sysctl_unregister(struct net *net) 51 { 52 struct ctl_table *table; 53 54 table = net->unx.ctl->ctl_table_arg; 55 unregister_net_sysctl_table(net->unx.ctl); 56 kfree(table); 57 } 58