1 /* 2 * NET4: Sysctl interface to net af_unix subsystem. 3 * 4 * Authors: Mike Shaver. 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11 12 #include <linux/mm.h> 13 #include <linux/slab.h> 14 #include <linux/sysctl.h> 15 16 #include <net/af_unix.h> 17 18 static struct ctl_table unix_table[] = { 19 { 20 .procname = "max_dgram_qlen", 21 .data = &init_net.unx.sysctl_max_dgram_qlen, 22 .maxlen = sizeof(int), 23 .mode = 0644, 24 .proc_handler = proc_dointvec 25 }, 26 { } 27 }; 28 29 int __net_init unix_sysctl_register(struct net *net) 30 { 31 struct ctl_table *table; 32 33 table = kmemdup(unix_table, sizeof(unix_table), GFP_KERNEL); 34 if (table == NULL) 35 goto err_alloc; 36 37 /* Don't export sysctls to unprivileged users */ 38 if (net->user_ns != &init_user_ns) 39 table[0].procname = NULL; 40 41 table[0].data = &net->unx.sysctl_max_dgram_qlen; 42 net->unx.ctl = register_net_sysctl(net, "net/unix", table); 43 if (net->unx.ctl == NULL) 44 goto err_reg; 45 46 return 0; 47 48 err_reg: 49 kfree(table); 50 err_alloc: 51 return -ENOMEM; 52 } 53 54 void unix_sysctl_unregister(struct net *net) 55 { 56 struct ctl_table *table; 57 58 table = net->unx.ctl->ctl_table_arg; 59 unregister_net_sysctl_table(net->unx.ctl); 60 kfree(table); 61 } 62