root/net/ipv6/netfilter/ip6table_raw.c

DEFINITIONS

1. ip6t_pre_routing_hook
2. ip6t_local_out_hook
3. ip6table_raw_net_init
4. ip6table_raw_net_exit
5. ip6table_raw_init
6. ip6table_raw_fini

/*
 * IPv6 raw table, a port of the IPv4 raw table to IPv6
 *
 * Copyright (C) 2003 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
 */
#include <linux/module.h>
#include <linux/netfilter_ipv6/ip6_tables.h>

#define RAW_VALID_HOOKS ((1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_OUT))

static struct
{
        struct ip6t_replace repl;
        struct ip6t_standard entries[2];
        struct ip6t_error term;
} initial_table __net_initdata = {
        .repl = {
                .name = "raw",
                .valid_hooks = RAW_VALID_HOOKS,
                .num_entries = 3,
                .size = sizeof(struct ip6t_standard) * 2 + sizeof(struct ip6t_error),
                .hook_entry = {
                        [NF_INET_PRE_ROUTING] = 0,
                        [NF_INET_LOCAL_OUT] = sizeof(struct ip6t_standard)
                },
                .underflow = {
                        [NF_INET_PRE_ROUTING] = 0,
                        [NF_INET_LOCAL_OUT] = sizeof(struct ip6t_standard)
                },
        },
        .entries = {
                IP6T_STANDARD_INIT(NF_ACCEPT),  /* PRE_ROUTING */
                IP6T_STANDARD_INIT(NF_ACCEPT),  /* LOCAL_OUT */
        },
        .term = IP6T_ERROR_INIT,                /* ERROR */
};

static struct xt_table packet_raw = {
        .name = "raw",
        .valid_hooks = RAW_VALID_HOOKS,
        .lock = __RW_LOCK_UNLOCKED(packet_raw.lock),
        .me = THIS_MODULE,
        .af = AF_INET6,
};

/* The work comes in here from netfilter.c. */
static unsigned int
ip6t_pre_routing_hook(unsigned int hook,
         struct sk_buff *skb,
         const struct net_device *in,
         const struct net_device *out,
         int (*okfn)(struct sk_buff *))
{
        return ip6t_do_table(skb, hook, in, out,
                             dev_net(in)->ipv6.ip6table_raw);
}

static unsigned int
ip6t_local_out_hook(unsigned int hook,
         struct sk_buff *skb,
         const struct net_device *in,
         const struct net_device *out,
         int (*okfn)(struct sk_buff *))
{
        return ip6t_do_table(skb, hook, in, out,
                             dev_net(out)->ipv6.ip6table_raw);
}

static struct nf_hook_ops ip6t_ops[] __read_mostly = {
        {
          .hook = ip6t_pre_routing_hook,
          .pf = PF_INET6,
          .hooknum = NF_INET_PRE_ROUTING,
          .priority = NF_IP6_PRI_FIRST,
          .owner = THIS_MODULE,
        },
        {
          .hook = ip6t_local_out_hook,
          .pf = PF_INET6,
          .hooknum = NF_INET_LOCAL_OUT,
          .priority = NF_IP6_PRI_FIRST,
          .owner = THIS_MODULE,
        },
};

static int __net_init ip6table_raw_net_init(struct net *net)
{
        /* Register table */
        net->ipv6.ip6table_raw =
                ip6t_register_table(net, &packet_raw, &initial_table.repl);
        if (IS_ERR(net->ipv6.ip6table_raw))
                return PTR_ERR(net->ipv6.ip6table_raw);
        return 0;
}

static void __net_exit ip6table_raw_net_exit(struct net *net)
{
        ip6t_unregister_table(net->ipv6.ip6table_raw);
}

static struct pernet_operations ip6table_raw_net_ops = {
        .init = ip6table_raw_net_init,
        .exit = ip6table_raw_net_exit,
};

static int __init ip6table_raw_init(void)
{
        int ret;

        ret = register_pernet_subsys(&ip6table_raw_net_ops);
        if (ret < 0)
                return ret;

        /* Register hooks */
        ret = nf_register_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
        if (ret < 0)
                goto cleanup_table;

        return ret;

 cleanup_table:
        unregister_pernet_subsys(&ip6table_raw_net_ops);
        return ret;
}

static void __exit ip6table_raw_fini(void)
{
        nf_unregister_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
        unregister_pernet_subsys(&ip6table_raw_net_ops);
}

module_init(ip6table_raw_init);
module_exit(ip6table_raw_fini);
MODULE_LICENSE("GPL");