Release 4.7 net/ipv4/netfilter/iptable_mangle.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/netfilter_ipv4/ip_tables.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <net/sock.h>
#include <net/route.h>
#include <linux/ip.h>
#include <net/ip.h>

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


#define MANGLE_VALID_HOOKS ((1 << NF_INET_PRE_ROUTING) | \
                            (1 << NF_INET_LOCAL_IN) | \
                            (1 << NF_INET_FORWARD) | \
                            (1 << NF_INET_LOCAL_OUT) | \
                            (1 << NF_INET_POST_ROUTING))

static int __net_init iptable_mangle_table_init(struct net *net);


static const struct xt_table packet_mangler = {
	.name		= "mangle",
	.valid_hooks	= MANGLE_VALID_HOOKS,
	.me		= THIS_MODULE,
	.af		= NFPROTO_IPV4,
	.priority	= NF_IP_PRI_MANGLE,
	.table_init	= iptable_mangle_table_init,
};


static unsigned int

ipt_mangle_out(struct sk_buff *skb, const struct nf_hook_state *state)
{
	unsigned int ret;
	const struct iphdr *iph;
	u_int8_t tos;
	__be32 saddr, daddr;
	u_int32_t mark;
	int err;

	/* root is playing with raw sockets. */
	if (skb->len < sizeof(struct iphdr) ||
	    ip_hdrlen(skb) < sizeof(struct iphdr))
		return NF_ACCEPT;

	/* Save things which could affect route */
	mark = skb->mark;
	iph = ip_hdr(skb);
	saddr = iph->saddr;
	daddr = iph->daddr;
	tos = iph->tos;

	ret = ipt_do_table(skb, state, state->net->ipv4.iptable_mangle);
	/* Reroute for ANY change. */
	if (ret != NF_DROP && ret != NF_STOLEN) {
		iph = ip_hdr(skb);

		if (iph->saddr != saddr ||
		    iph->daddr != daddr ||
		    skb->mark != mark ||
		    iph->tos != tos) {
			err = ip_route_me_harder(state->net, skb, RTN_UNSPEC);
			if (err < 0)
				ret = NF_DROP_ERR(err);
		}
	}

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 114 58.46% 2 12.50%
arnaldo carvalho de melo arnaldo carvalho de melo 27 13.85% 2 12.50%
patrick mchardy patrick mchardy 17 8.72% 1 6.25%
herbert xu herbert xu 9 4.62% 1 6.25%
eric w. biederman eric w. biederman 7 3.59% 2 12.50%
thomas graf thomas graf 6 3.08% 1 6.25%
simon horman simon horman 5 2.56% 1 6.25%
david s. miller david s. miller 4 2.05% 2 12.50%
alexey dobriyan alexey dobriyan 4 2.05% 2 12.50%
jan engelhardt jan engelhardt 1 0.51% 1 6.25%
al viro al viro 1 0.51% 1 6.25%
Total 195 100.00% 16 100.00%

/* The work comes in here from netfilter.c. */

static unsigned int

iptable_mangle_hook(void *priv,
		     struct sk_buff *skb,
		     const struct nf_hook_state *state)
{
	if (state->hook == NF_INET_LOCAL_OUT)
		return ipt_mangle_out(skb, state);
	if (state->hook == NF_INET_POST_ROUTING)
		return ipt_do_table(skb, state,
				    state->net->ipv4.iptable_mangle);
	/* PREROUTING/INPUT/FORWARD: */
	return ipt_do_table(skb, state, state->net->ipv4.iptable_mangle);
}

Contributors
Person Tokens Prop Commits CommitProp
jan engelhardt jan engelhardt 42 53.16% 2 25.00%
alexey dobriyan alexey dobriyan 17 21.52% 1 12.50%
david s. miller david s. miller 9 11.39% 1 12.50%
eric w. biederman eric w. biederman 8 10.13% 3 37.50%
patrick mchardy patrick mchardy 3 3.80% 1 12.50%
Total 79 100.00% 8 100.00%


static struct nf_hook_ops *mangle_ops __read_mostly;


static int __net_init iptable_mangle_table_init(struct net *net)
{
	struct ipt_replace *repl;
	int ret;

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

	repl = ipt_alloc_initial_table(&packet_mangler);
	if (repl == NULL)
		return -ENOMEM;
	ret = ipt_register_table(net, &packet_mangler, repl, mangle_ops,
				 &net->ipv4.iptable_mangle);
	kfree(repl);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
jan engelhardt jan engelhardt 28 35.90% 1 14.29%
florian westphal florian westphal 26 33.33% 2 28.57%
alexey dobriyan alexey dobriyan 11 14.10% 2 28.57%
pre-git pre-git 11 14.10% 1 14.29%
harald welte harald welte 2 2.56% 1 14.29%
Total 78 100.00% 7 100.00%



static void __net_exit iptable_mangle_net_exit(struct net *net)
{
	if (!net->ipv4.iptable_mangle)
		return;
	ipt_unregister_table(net, net->ipv4.iptable_mangle, mangle_ops);
	net->ipv4.iptable_mangle = NULL;
}

Contributors
Person Tokens Prop Commits CommitProp
alexey dobriyan alexey dobriyan 23 53.49% 2 50.00%
florian westphal florian westphal 20 46.51% 2 50.00%
Total 43 100.00% 4 100.00%


static struct pernet_operations iptable_mangle_net_ops = {
	.exit = iptable_mangle_net_exit,
};



static int __init iptable_mangle_init(void)
{
	int ret;

	mangle_ops = xt_hook_ops_alloc(&packet_mangler, iptable_mangle_hook);
	if (IS_ERR(mangle_ops)) {
		ret = PTR_ERR(mangle_ops);
		return ret;
	}

	ret = register_pernet_subsys(&iptable_mangle_net_ops);
	if (ret < 0) {
		kfree(mangle_ops);
		return ret;
	}

	ret = iptable_mangle_table_init(&init_net);
	if (ret) {
		unregister_pernet_subsys(&iptable_mangle_net_ops);
		kfree(mangle_ops);
	}

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
florian westphal florian westphal 45 48.39% 1 14.29%
alexey dobriyan alexey dobriyan 24 25.81% 2 28.57%
pre-git pre-git 10 10.75% 1 14.29%
jan engelhardt jan engelhardt 9 9.68% 1 14.29%
linus torvalds linus torvalds 4 4.30% 1 14.29%
jean sacren jean sacren 1 1.08% 1 14.29%
Total 93 100.00% 7 100.00%



static void __exit iptable_mangle_fini(void)
{
	unregister_pernet_subsys(&iptable_mangle_net_ops);
	kfree(mangle_ops);
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 14 70.00% 1 25.00%
florian westphal florian westphal 4 20.00% 1 25.00%
jan engelhardt jan engelhardt 1 5.00% 1 25.00%
andrew morton andrew morton 1 5.00% 1 25.00%
Total 20 100.00% 4 100.00%


module_init(iptable_mangle_init);

module_exit(iptable_mangle_fini);
Overall Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 194 30.60% 2 4.76%
florian westphal florian westphal 111 17.51% 2 4.76%
jan engelhardt jan engelhardt 92 14.51% 7 16.67%
alexey dobriyan alexey dobriyan 92 14.51% 5 11.90%
arnaldo carvalho de melo arnaldo carvalho de melo 30 4.73% 2 4.76%
patrick mchardy patrick mchardy 23 3.63% 5 11.90%
harald welte harald welte 21 3.31% 3 7.14%
eric w. biederman eric w. biederman 15 2.37% 4 9.52%
david s. miller david s. miller 13 2.05% 3 7.14%
art haas art haas 10 1.58% 1 2.38%
herbert xu herbert xu 9 1.42% 1 2.38%
thomas graf thomas graf 6 0.95% 1 2.38%
simon horman simon horman 5 0.79% 1 2.38%
linus torvalds linus torvalds 5 0.79% 1 2.38%
andrew morton andrew morton 3 0.47% 1 2.38%
tejun heo tejun heo 3 0.47% 1 2.38%
al viro al viro 1 0.16% 1 2.38%
jean sacren jean sacren 1 0.16% 1 2.38%
Total 634 100.00% 42 100.00%
  Directory: net/ipv4/netfilter

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
	Person	Tokens	Prop	Commits	CommitProp
pre-git	pre-git	114	58.46%	2	12.50%
arnaldo carvalho de melo	arnaldo carvalho de melo	27	13.85%	2	12.50%
patrick mchardy	patrick mchardy	17	8.72%	1	6.25%
herbert xu	herbert xu	9	4.62%	1	6.25%
eric w. biederman	eric w. biederman	7	3.59%	2	12.50%
thomas graf	thomas graf	6	3.08%	1	6.25%
simon horman	simon horman	5	2.56%	1	6.25%
david s. miller	david s. miller	4	2.05%	2	12.50%
alexey dobriyan	alexey dobriyan	4	2.05%	2	12.50%
jan engelhardt	jan engelhardt	1	0.51%	1	6.25%
al viro	al viro	1	0.51%	1	6.25%
	Total	195	100.00%	16	100.00%
cregit-Linux how code gets into the kernel

Release 4.7 net/ipv4/netfilter/iptable_mangle.c

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