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![Patrick McHardy](/assets/img/avatar_default.png)
Don't spam logs for locally generated short packets. these can only be generated by root. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
140 lines
3.2 KiB
C
140 lines
3.2 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 <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 struct
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{
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struct ipt_replace repl;
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struct ipt_standard entries[2];
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struct ipt_error term;
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} initial_table __net_initdata = {
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.repl = {
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.name = "raw",
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.valid_hooks = RAW_VALID_HOOKS,
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.num_entries = 3,
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.size = sizeof(struct ipt_standard) * 2 + sizeof(struct ipt_error),
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.hook_entry = {
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[NF_INET_PRE_ROUTING] = 0,
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[NF_INET_LOCAL_OUT] = sizeof(struct ipt_standard)
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},
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.underflow = {
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[NF_INET_PRE_ROUTING] = 0,
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[NF_INET_LOCAL_OUT] = sizeof(struct ipt_standard)
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},
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},
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.entries = {
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IPT_STANDARD_INIT(NF_ACCEPT), /* PRE_ROUTING */
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IPT_STANDARD_INIT(NF_ACCEPT), /* LOCAL_OUT */
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},
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.term = IPT_ERROR_INIT, /* ERROR */
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};
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static struct xt_table packet_raw = {
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.name = "raw",
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.valid_hooks = RAW_VALID_HOOKS,
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.lock = __RW_LOCK_UNLOCKED(packet_raw.lock),
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.me = THIS_MODULE,
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.af = AF_INET,
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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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ipt_hook(unsigned int hook,
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struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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int (*okfn)(struct sk_buff *))
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{
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return ipt_do_table(skb, hook, in, out,
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dev_net(in)->ipv4.iptable_raw);
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}
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static unsigned int
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ipt_local_hook(unsigned int hook,
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struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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int (*okfn)(struct sk_buff *))
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{
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/* root is playing with raw sockets. */
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if (skb->len < sizeof(struct iphdr) ||
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ip_hdrlen(skb) < sizeof(struct iphdr))
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return NF_ACCEPT;
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return ipt_do_table(skb, hook, in, out,
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dev_net(out)->ipv4.iptable_raw);
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}
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/* 'raw' is the very first table. */
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static struct nf_hook_ops ipt_ops[] __read_mostly = {
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{
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.hook = ipt_hook,
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.pf = PF_INET,
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.hooknum = NF_INET_PRE_ROUTING,
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.priority = NF_IP_PRI_RAW,
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.owner = THIS_MODULE,
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},
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{
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.hook = ipt_local_hook,
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.pf = PF_INET,
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.hooknum = NF_INET_LOCAL_OUT,
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.priority = NF_IP_PRI_RAW,
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.owner = THIS_MODULE,
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},
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};
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static int __net_init iptable_raw_net_init(struct net *net)
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{
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/* Register table */
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net->ipv4.iptable_raw =
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ipt_register_table(net, &packet_raw, &initial_table.repl);
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if (IS_ERR(net->ipv4.iptable_raw))
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return PTR_ERR(net->ipv4.iptable_raw);
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return 0;
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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->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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ret = nf_register_hooks(ipt_ops, ARRAY_SIZE(ipt_ops));
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if (ret < 0)
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goto cleanup_table;
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return ret;
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cleanup_table:
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unregister_pernet_subsys(&iptable_raw_net_ops);
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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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nf_unregister_hooks(ipt_ops, ARRAY_SIZE(ipt_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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