net/unix/sysctl_net_unix.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * NET4:    Sysctl interface to net af_unix subsystem.
0004  *
0005  * Authors: Mike Shaver.
0006  */
0007
0008 #include <linux/mm.h>
0009 #include <linux/slab.h>
0010 #include <linux/sysctl.h>
0011
0012 #include <net/af_unix.h>
0013
0014 static struct ctl_table unix_table[] = {
0015     {
0016         .procname   = "max_dgram_qlen",
0017         .data       = &init_net.unx.sysctl_max_dgram_qlen,
0018         .maxlen     = sizeof(int),
0019         .mode       = 0644,
0020         .proc_handler   = proc_dointvec
0021     },
0022     { }
0023 };
0024
0025 int __net_init unix_sysctl_register(struct net *net)
0026 {
0027     struct ctl_table *table;
0028
0029     if (net_eq(net, &init_net)) {
0030         table = unix_table;
0031     } else {
0032         table = kmemdup(unix_table, sizeof(unix_table), GFP_KERNEL);
0033         if (!table)
0034             goto err_alloc;
0035
0036         table[0].data = &net->unx.sysctl_max_dgram_qlen;
0037     }
0038
0039     net->unx.ctl = register_net_sysctl(net, "net/unix", table);
0040     if (net->unx.ctl == NULL)
0041         goto err_reg;
0042
0043     return 0;
0044
0045 err_reg:
0046     if (!net_eq(net, &init_net))
0047         kfree(table);
0048 err_alloc:
0049     return -ENOMEM;
0050 }
0051
0052 void unix_sysctl_unregister(struct net *net)
0053 {
0054     struct ctl_table *table;
0055
0056     table = net->unx.ctl->ctl_table_arg;
0057     unregister_net_sysctl_table(net->unx.ctl);
0058     if (!net_eq(net, &init_net))
0059         kfree(table);
0060 }