root/net/ipv6/sysctl_net_ipv6.c

DEFINITIONS

1. ipv6_sysctl_net_init
2. ipv6_sysctl_net_exit
3. ipv6_sysctl_register
4. ipv6_sysctl_unregister
5. ipv6_static_sysctl_register
6. ipv6_static_sysctl_unregister

/*
 * 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 <net/ndisc.h>
#include <net/ipv6.h>
#include <net/addrconf.h>
#include <net/inet_frag.h>

static ctl_table ipv6_table_template[] = {
        {
                .ctl_name       = NET_IPV6_ROUTE,
                .procname       = "route",
                .maxlen         = 0,
                .mode           = 0555,
                .child          = ipv6_route_table_template
        },
        {
                .ctl_name       = NET_IPV6_ICMP,
                .procname       = "icmp",
                .maxlen         = 0,
                .mode           = 0555,
                .child          = ipv6_icmp_table_template
        },
        {
                .ctl_name       = NET_IPV6_BINDV6ONLY,
                .procname       = "bindv6only",
                .data           = &init_net.ipv6.sysctl.bindv6only,
                .maxlen         = sizeof(int),
                .mode           = 0644,
                .proc_handler   = &proc_dointvec
        },
        { .ctl_name = 0 }
};

static ctl_table ipv6_table[] = {
        {
                .ctl_name       = NET_IPV6_MLD_MAX_MSF,
                .procname       = "mld_max_msf",
                .data           = &sysctl_mld_max_msf,
                .maxlen         = sizeof(int),
                .mode           = 0644,
                .proc_handler   = &proc_dointvec
        },
        { .ctl_name = 0 }
};

struct ctl_path net_ipv6_ctl_path[] = {
        { .procname = "net", .ctl_name = CTL_NET, },
        { .procname = "ipv6", .ctl_name = NET_IPV6, },
        { },
};
EXPORT_SYMBOL_GPL(net_ipv6_ctl_path);

static int 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_route_table = ipv6_route_sysctl_init(net);
        if (!ipv6_route_table)
                goto out_ipv6_table;
        ipv6_table[0].child = ipv6_route_table;

        ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
        if (!ipv6_icmp_table)
                goto out_ipv6_route_table;
        ipv6_table[1].child = ipv6_icmp_table;

        ipv6_table[2].data = &net->ipv6.sysctl.bindv6only;

        net->ipv6.sysctl.table = register_net_sysctl_table(net, net_ipv6_ctl_path,
                                                           ipv6_table);
        if (!net->ipv6.sysctl.table)
                goto out_ipv6_icmp_table;

        err = 0;
out:
        return err;

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 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.table->ctl_table_arg;
        ipv6_route_table = ipv6_table[0].child;
        ipv6_icmp_table = ipv6_table[1].child;

        unregister_net_sysctl_table(net->ipv6.sysctl.table);

        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_rotable(net_ipv6_ctl_path, ipv6_table);
        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);
}

static struct ctl_table_header *ip6_base;

int ipv6_static_sysctl_register(void)
{
        static struct ctl_table empty[1];
        ip6_base = register_sysctl_paths(net_ipv6_ctl_path, empty);
        if (ip6_base == NULL)
                return -ENOMEM;
        return 0;
}

void ipv6_static_sysctl_unregister(void)
{
        unregister_net_sysctl_table(ip6_base);
}