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 if (net_eq(net, &init_net)) { 30 table = unix_table; 31 } else { 32 table = kmemdup(unix_table, sizeof(unix_table), GFP_KERNEL); 33 if (!table) 34 goto err_alloc; 35 36 table[0].data = &net->unx.sysctl_max_dgram_qlen; 37 } 38 39 net->unx.ctl = register_net_sysctl_sz(net, "net/unix", table, 40 ARRAY_SIZE(unix_table)); 41 if (net->unx.ctl == NULL) 42 goto err_reg; 43 44 return 0; 45 46 err_reg: 47 if (!net_eq(net, &init_net)) 48 kfree(table); 49 err_alloc: 50 return -ENOMEM; 51 } 52 53 void unix_sysctl_unregister(struct net *net) 54 { 55 struct ctl_table *table; 56 57 table = net->unx.ctl->ctl_table_arg; 58 unregister_net_sysctl_table(net->unx.ctl); 59 if (!net_eq(net, &init_net)) 60 kfree(table); 61 } 62