cregit-Linux how code gets into the kernel

Release 4.8 net/ipv4/netfilter/iptable_filter.c

Directory: net/ipv4/netfilter
/*
 * This is the 1999 rewrite of IP Firewalling, aiming for kernel 2.3.x.
 *
 * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
 * Copyright (C) 2000-2004 Netfilter Core Team <coreteam@netfilter.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/slab.h>
#include <net/ip.h>

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
MODULE_DESCRIPTION("iptables filter table");


#define FILTER_VALID_HOOKS ((1 << NF_INET_LOCAL_IN) | \
                            (1 << NF_INET_FORWARD) | \
                            (1 << NF_INET_LOCAL_OUT))
static int __net_init iptable_filter_table_init(struct net *net);


static const struct xt_table packet_filter = {
	.name		= "filter",
	.valid_hooks	= FILTER_VALID_HOOKS,
	.me		= THIS_MODULE,
	.af		= NFPROTO_IPV4,
	.priority	= NF_IP_PRI_FILTER,
	.table_init	= iptable_filter_table_init,
};



static unsigned int

iptable_filter_hook(void *priv, struct sk_buff *skb,
		    const struct nf_hook_state *state)
{
	if (state->hook == NF_INET_LOCAL_OUT &&
	    (skb->len < sizeof(struct iphdr) ||
	     ip_hdrlen(skb) < sizeof(struct iphdr)))
		/* root is playing with raw sockets. */
		return NF_ACCEPT;

	return ipt_do_table(skb, state, state->net->ipv4.iptable_filter);
}


Contributors
PersonTokensPropCommitsCommitProp
jan engelhardtjan engelhardt2331.51%218.18%


pre-gitpre-git2230.14%19.09%


alexey dobriyanalexey dobriyan1216.44%19.09%


eric w. biedermaneric w. biederman68.22%327.27%


arnaldo carvalho de meloarnaldo carvalho de melo34.11%19.09%


david s. millerdavid s. miller34.11%19.09%


herbert xuherbert xu22.74%19.09%


patrick mchardypatrick mchardy22.74%19.09%


Total73100.00%11100.00%




static struct nf_hook_ops *filter_ops __read_mostly;

/* Default to forward because I got too much mail already. */

static bool forward __read_mostly = true;
module_param(forward, bool, 0000);




static int __net_init iptable_filter_table_init(struct net *net)
{
	struct ipt_replace *repl;
	int err;

	if (net->ipv4.iptable_filter)
		return 0;

	repl = ipt_alloc_initial_table(&packet_filter);
	if (repl == NULL)
		return -ENOMEM;
	/* Entry 1 is the FORWARD hook */
	((struct ipt_standard *)repl->entries)[1].target.verdict =
		forward ? -NF_ACCEPT - 1 : -NF_DROP - 1;

	err = ipt_register_table(net, &packet_filter, repl, filter_ops,
				 &net->ipv4.iptable_filter);
	kfree(repl);
	return err;
}


Contributors
PersonTokensPropCommitsCommitProp
jan engelhardtjan engelhardt5146.79%120.00%


florian westphalflorian westphal2623.85%240.00%


alexey dobriyanalexey dobriyan2422.02%120.00%


rusty russellrusty russell87.34%120.00%


Total109100.00%5100.00%






static int __net_init iptable_filter_net_init(struct net *net)
{
	if (net == &init_net || !forward)
		return iptable_filter_table_init(net);

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
florian westphalflorian westphal31100.00%1100.00%


Total31100.00%1100.00%






static void __net_exit iptable_filter_net_exit(struct net *net)
{
	if (!net->ipv4.iptable_filter)
		return;
	ipt_unregister_table(net, net->ipv4.iptable_filter, filter_ops);
	net->ipv4.iptable_filter = NULL;
}


Contributors
PersonTokensPropCommitsCommitProp
alexey dobriyanalexey dobriyan2353.49%250.00%


florian westphalflorian westphal2046.51%250.00%


Total43100.00%4100.00%




static struct pernet_operations iptable_filter_net_ops = {
	.init = iptable_filter_net_init,
	.exit = iptable_filter_net_exit,
};




static int __init iptable_filter_init(void)
{
	int ret;

	filter_ops = xt_hook_ops_alloc(&packet_filter, iptable_filter_hook);
	if (IS_ERR(filter_ops))
		return PTR_ERR(filter_ops);

	ret = register_pernet_subsys(&iptable_filter_net_ops);
	if (ret < 0)
		kfree(filter_ops);

	return ret;
}


Contributors
PersonTokensPropCommitsCommitProp
pre-gitpre-git2442.11%116.67%


florian westphalflorian westphal1729.82%116.67%


jan engelhardtjan engelhardt1221.05%116.67%


alexey dobriyanalexey dobriyan23.51%116.67%


patrick mchardypatrick mchardy11.75%116.67%


andrew mortonandrew morton11.75%116.67%


Total57100.00%6100.00%






static void __exit iptable_filter_fini(void)
{
	unregister_pernet_subsys(&iptable_filter_net_ops);
	kfree(filter_ops);
}


Contributors
PersonTokensPropCommitsCommitProp
pre-gitpre-git1470.00%125.00%


florian westphalflorian westphal420.00%125.00%


andrew mortonandrew morton15.00%125.00%


jan engelhardtjan engelhardt15.00%125.00%


Total20100.00%4100.00%




module_init(iptable_filter_init);

module_exit(iptable_filter_fini);

Overall Contributors
PersonTokensPropCommitsCommitProp
florian westphalflorian westphal11524.57%25.88%


pre-gitpre-git10021.37%25.88%


jan engelhardtjan engelhardt9720.73%720.59%


alexey dobriyanalexey dobriyan7916.88%38.82%


harald welteharald welte285.98%411.76%


rusty russellrusty russell102.14%25.88%


art haasart haas91.92%12.94%


arnaldo carvalho de meloarnaldo carvalho de melo61.28%12.94%


eric w. biedermaneric w. biederman61.28%38.82%


patrick mchardypatrick mchardy51.07%411.76%


andrew mortonandrew morton40.85%12.94%


david s. millerdavid s. miller30.64%12.94%


tejun heotejun heo30.64%12.94%


herbert xuherbert xu20.43%12.94%


linus torvaldslinus torvalds10.21%12.94%


Total468100.00%34100.00%

  
Directory: net/ipv4/netfilter



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