// SPDX-License-Identifier: GPL-2.0-only
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/*
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* 'raw' table, which is the very first hooked in at PRE_ROUTING and LOCAL_OUT .
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*
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* Copyright (C) 2003 Jozsef Kadlecsik <kadlec@netfilter.org>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/netfilter_ipv4/ip_tables.h>
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#include <linux/slab.h>
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#include <net/ip.h>
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#define RAW_VALID_HOOKS ((1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_OUT))
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static int __net_init iptable_raw_table_init(struct net *net);
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static bool raw_before_defrag __read_mostly;
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MODULE_PARM_DESC(raw_before_defrag, "Enable raw table before defrag");
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module_param(raw_before_defrag, bool, 0000);
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static const struct xt_table packet_raw = {
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.name = "raw",
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.valid_hooks = RAW_VALID_HOOKS,
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.me = THIS_MODULE,
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.af = NFPROTO_IPV4,
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.priority = NF_IP_PRI_RAW,
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.table_init = iptable_raw_table_init,
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};
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static const struct xt_table packet_raw_before_defrag = {
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.name = "raw",
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.valid_hooks = RAW_VALID_HOOKS,
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.me = THIS_MODULE,
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.af = NFPROTO_IPV4,
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.priority = NF_IP_PRI_RAW_BEFORE_DEFRAG,
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.table_init = iptable_raw_table_init,
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};
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/* The work comes in here from netfilter.c. */
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static unsigned int
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iptable_raw_hook(void *priv, struct sk_buff *skb,
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const struct nf_hook_state *state)
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{
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return ipt_do_table(skb, state, state->net->ipv4.iptable_raw);
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}
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static struct nf_hook_ops *rawtable_ops __read_mostly;
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static int __net_init iptable_raw_table_init(struct net *net)
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{
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struct ipt_replace *repl;
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const struct xt_table *table = &packet_raw;
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int ret;
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if (raw_before_defrag)
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table = &packet_raw_before_defrag;
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if (net->ipv4.iptable_raw)
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return 0;
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repl = ipt_alloc_initial_table(table);
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if (repl == NULL)
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return -ENOMEM;
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ret = ipt_register_table(net, table, repl, rawtable_ops,
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&net->ipv4.iptable_raw);
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kfree(repl);
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return ret;
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}
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static void __net_exit iptable_raw_net_pre_exit(struct net *net)
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{
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if (net->ipv4.iptable_raw)
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ipt_unregister_table_pre_exit(net, net->ipv4.iptable_raw,
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rawtable_ops);
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}
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static void __net_exit iptable_raw_net_exit(struct net *net)
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{
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if (!net->ipv4.iptable_raw)
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return;
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ipt_unregister_table_exit(net, net->ipv4.iptable_raw);
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net->ipv4.iptable_raw = NULL;
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}
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static struct pernet_operations iptable_raw_net_ops = {
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.pre_exit = iptable_raw_net_pre_exit,
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.exit = iptable_raw_net_exit,
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};
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static int __init iptable_raw_init(void)
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{
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int ret;
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const struct xt_table *table = &packet_raw;
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if (raw_before_defrag) {
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table = &packet_raw_before_defrag;
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pr_info("Enabling raw table before defrag\n");
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}
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rawtable_ops = xt_hook_ops_alloc(table, iptable_raw_hook);
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if (IS_ERR(rawtable_ops))
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return PTR_ERR(rawtable_ops);
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ret = register_pernet_subsys(&iptable_raw_net_ops);
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if (ret < 0) {
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kfree(rawtable_ops);
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return ret;
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}
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ret = iptable_raw_table_init(&init_net);
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if (ret) {
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unregister_pernet_subsys(&iptable_raw_net_ops);
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kfree(rawtable_ops);
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}
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return ret;
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}
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static void __exit iptable_raw_fini(void)
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{
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unregister_pernet_subsys(&iptable_raw_net_ops);
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kfree(rawtable_ops);
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}
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module_init(iptable_raw_init);
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module_exit(iptable_raw_fini);
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MODULE_LICENSE("GPL");
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