sysctl_net_ipv6.c

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/*
 * sysctl_net_ipv6.c: sysctl interface to net IPV6 subsystem.
 *
 * Changes:
 * YOSHIFUJI Hideaki @USAGI:    added icmp sysctl table.
 */

#include <linux/mm.h>
#include <linux/sysctl.h>
#include <linux/in6.h>
#include <linux/ipv6.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <net/ndisc.h>
#include <net/ipv6.h>
#include <net/addrconf.h>
#include <net/inet_frag.h>

static ctl_table ipv6_table_template[] = {
    {
        .procname   = "bindv6only",
        .data       = &init_net.ipv6.sysctl.bindv6only,
        .maxlen     = sizeof(int),
        .mode       = 0644,
        .proc_handler   = proc_dointvec
    },
    { }
};

static ctl_table ipv6_rotable[] = {
    {
        .procname   = "mld_max_msf",
        .data       = &sysctl_mld_max_msf,
        .maxlen     = sizeof(int),
        .mode       = 0644,
        .proc_handler   = proc_dointvec
    },
    { }
};

static int __net_init ipv6_sysctl_net_init(struct net *net)
{
    struct ctl_table *ipv6_table;
    struct ctl_table *ipv6_route_table;
    struct ctl_table *ipv6_icmp_table;
    int err;

    err = -ENOMEM;
    ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
                 GFP_KERNEL);
    if (!ipv6_table)
        goto out;
    ipv6_table[0].data = &net->ipv6.sysctl.bindv6only;

    ipv6_route_table = ipv6_route_sysctl_init(net);
    if (!ipv6_route_table)
        goto out_ipv6_table;

    ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
    if (!ipv6_icmp_table)
        goto out_ipv6_route_table;

    net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table);
    if (!net->ipv6.sysctl.hdr)
        goto out_ipv6_icmp_table;

    net->ipv6.sysctl.route_hdr =
        register_net_sysctl(net, "net/ipv6/route", ipv6_route_table);
    if (!net->ipv6.sysctl.route_hdr)
        goto out_unregister_ipv6_table;

    net->ipv6.sysctl.icmp_hdr =
        register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table);
    if (!net->ipv6.sysctl.icmp_hdr)
        goto out_unregister_route_table;

    err = 0;
out:
    return err;
out_unregister_route_table:
    unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
out_unregister_ipv6_table:
    unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
out_ipv6_icmp_table:
    kfree(ipv6_icmp_table);
out_ipv6_route_table:
    kfree(ipv6_route_table);
out_ipv6_table:
    kfree(ipv6_table);
    goto out;
}

static void __net_exit ipv6_sysctl_net_exit(struct net *net)
{
    struct ctl_table *ipv6_table;
    struct ctl_table *ipv6_route_table;
    struct ctl_table *ipv6_icmp_table;

    ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg;
    ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg;
    ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg;

    unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr);
    unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
    unregister_net_sysctl_table(net->ipv6.sysctl.hdr);

    kfree(ipv6_table);
    kfree(ipv6_route_table);
    kfree(ipv6_icmp_table);
}

static struct pernet_operations ipv6_sysctl_net_ops = {
    .init = ipv6_sysctl_net_init,
    .exit = ipv6_sysctl_net_exit,
};

static struct ctl_table_header *ip6_header;

int ipv6_sysctl_register(void)
{
    int err = -ENOMEM;

    ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable);
    if (ip6_header == NULL)
        goto out;

    err = register_pernet_subsys(&ipv6_sysctl_net_ops);
    if (err)
        goto err_pernet;
out:
    return err;

err_pernet:
    unregister_net_sysctl_table(ip6_header);
    goto out;
}

void ipv6_sysctl_unregister(void)
{
    unregister_net_sysctl_table(ip6_header);
    unregister_pernet_subsys(&ipv6_sysctl_net_ops);
}