795aa6ef6a
Pass the hook ops to the hookfn to allow for generic hook functions. This change is required by nf_tables. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
91 lines
2.2 KiB
C
91 lines
2.2 KiB
C
/*
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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@blackhole.kfki.hu>
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*/
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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 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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};
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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(const struct nf_hook_ops *ops, struct sk_buff *skb,
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const struct net_device *in, const struct net_device *out,
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int (*okfn)(struct sk_buff *))
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{
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const struct net *net;
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if (ops->hooknum == NF_INET_LOCAL_OUT &&
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(skb->len < sizeof(struct iphdr) ||
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ip_hdrlen(skb) < sizeof(struct iphdr)))
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/* root is playing with raw sockets. */
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return NF_ACCEPT;
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net = dev_net((in != NULL) ? in : out);
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return ipt_do_table(skb, ops->hooknum, in, out, 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_net_init(struct net *net)
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{
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struct ipt_replace *repl;
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repl = ipt_alloc_initial_table(&packet_raw);
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if (repl == NULL)
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return -ENOMEM;
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net->ipv4.iptable_raw =
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ipt_register_table(net, &packet_raw, repl);
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kfree(repl);
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return PTR_ERR_OR_ZERO(net->ipv4.iptable_raw);
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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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ipt_unregister_table(net, net->ipv4.iptable_raw);
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}
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static struct pernet_operations iptable_raw_net_ops = {
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.init = iptable_raw_net_init,
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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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ret = register_pernet_subsys(&iptable_raw_net_ops);
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if (ret < 0)
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return ret;
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/* Register hooks */
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rawtable_ops = xt_hook_link(&packet_raw, iptable_raw_hook);
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if (IS_ERR(rawtable_ops)) {
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ret = PTR_ERR(rawtable_ops);
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unregister_pernet_subsys(&iptable_raw_net_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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xt_hook_unlink(&packet_raw, rawtable_ops);
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unregister_pernet_subsys(&iptable_raw_net_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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