Release 4.11 net/ipv6/netfilter/ip6table_mangle.c

/*
 * IPv6 packet mangling table, a port of the IPv4 mangle table to IPv6
 *
 * Copyright (C) 2000-2001 by Harald Welte <laforge@gnumonks.org>
 * 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_ipv6/ip6_tables.h>
#include <linux/slab.h>
#include <net/ipv6.h>

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
MODULE_DESCRIPTION("ip6tables 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 ip6table_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_IPV6,
	.priority	= NF_IP6_PRI_MANGLE,
	.table_init	= ip6table_mangle_table_init,
};


static unsigned int

ip6t_mangle_out(struct sk_buff *skb, const struct nf_hook_state *state)
{
	unsigned int ret;
	struct in6_addr saddr, daddr;
	u_int8_t hop_limit;
	u_int32_t flowlabel, mark;
	int err;
#if 0
	/* root is playing with raw sockets. */
	if (skb->len < sizeof(struct iphdr) ||
            ip_hdrlen(skb) < sizeof(struct iphdr)) {
                net_warn_ratelimited("ip6t_hook: happy cracking\n");
                return NF_ACCEPT;
        }
#endif

	/* save source/dest address, mark, hoplimit, flowlabel, priority,  */
	memcpy(&saddr, &ipv6_hdr(skb)->saddr, sizeof(saddr));
	memcpy(&daddr, &ipv6_hdr(skb)->daddr, sizeof(daddr));
	mark = skb->mark;
	hop_limit = ipv6_hdr(skb)->hop_limit;

	/* flowlabel and prio (includes version, which shouldn't change either */
	flowlabel = *((u_int32_t *)ipv6_hdr(skb));

	ret = ip6t_do_table(skb, state, state->net->ipv6.ip6table_mangle);

	if (ret != NF_DROP && ret != NF_STOLEN &&
	    (!ipv6_addr_equal(&ipv6_hdr(skb)->saddr, &saddr) ||
	     !ipv6_addr_equal(&ipv6_hdr(skb)->daddr, &daddr) ||
	     skb->mark != mark ||
	     ipv6_hdr(skb)->hop_limit != hop_limit ||
	     flowlabel != *((u_int32_t *)ipv6_hdr(skb)))) {
		err = ip6_route_me_harder(state->net, skb);
		if (err < 0)
			ret = NF_DROP_ERR(err);
	}

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds
130
56.03%
1
6.25%
David S. Miller
25
10.78%
3
18.75%
Patrick McHardy
22
9.48%
2
12.50%
Arnaldo Carvalho de Melo
21
9.05%
1
6.25%
Herbert Xu
12
5.17%
1
6.25%
Thomas Graf
7
3.02%
1
6.25%
Eric W. Biedermann
5
2.16%
2
12.50%
Alexey Dobriyan
4
1.72%
2
12.50%
Hideaki Yoshifuji / 吉藤英明
4
1.72%
1
6.25%
Joe Perches
1
0.43%
1
6.25%
Jan Engelhardt
1
0.43%
1
6.25%
Total
232
100.00%
16
100.00%

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

static unsigned int

ip6table_mangle_hook(void *priv, struct sk_buff *skb,
		     const struct nf_hook_state *state)
{
	if (state->hook == NF_INET_LOCAL_OUT)
		return ip6t_mangle_out(skb, state);
	return ip6t_do_table(skb, state, state->net->ipv6.ip6table_mangle);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Engelhardt
41
75.93%
2
28.57%
David S. Miller
6
11.11%
1
14.29%
Eric W. Biedermann
5
9.26%
3
42.86%
Patrick McHardy
2
3.70%
1
14.29%
Total
54
100.00%
7
100.00%


static struct nf_hook_ops *mangle_ops __read_mostly;


static int __net_init ip6table_mangle_table_init(struct net *net)
{
	struct ip6t_replace *repl;
	int ret;

	if (net->ipv6.ip6table_mangle)
		return 0;

	repl = ip6t_alloc_initial_table(&packet_mangler);
	if (repl == NULL)
		return -ENOMEM;
	ret = ip6t_register_table(net, &packet_mangler, repl, mangle_ops,
				  &net->ipv6.ip6table_mangle);
	kfree(repl);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Engelhardt
28
35.90%
1
14.29%
Florian Westphal
26
33.33%
2
28.57%
Alexey Dobriyan
11
14.10%
2
28.57%
Linus Torvalds
11
14.10%
1
14.29%
Harald Welte
2
2.56%
1
14.29%
Total
78
100.00%
7
100.00%



static void __net_exit ip6table_mangle_net_exit(struct net *net)
{
	if (!net->ipv6.ip6table_mangle)
		return;

	ip6t_unregister_table(net, net->ipv6.ip6table_mangle, mangle_ops);
	net->ipv6.ip6table_mangle = NULL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Alexey Dobriyan
23
53.49%
2
50.00%
Florian Westphal
20
46.51%
2
50.00%
Total
43
100.00%
4
100.00%


static struct pernet_operations ip6table_mangle_net_ops = {
	.exit = ip6table_mangle_net_exit,
};



static int __init ip6table_mangle_init(void)
{
	int ret;

	mangle_ops = xt_hook_ops_alloc(&packet_mangler, ip6table_mangle_hook);
	if (IS_ERR(mangle_ops))
		return PTR_ERR(mangle_ops);

	ret = register_pernet_subsys(&ip6table_mangle_net_ops);
	if (ret < 0) {
		kfree(mangle_ops);
		return ret;
	}

	ret = ip6table_mangle_table_init(&init_net);
	if (ret) {
		unregister_pernet_subsys(&ip6table_mangle_net_ops);
		kfree(mangle_ops);
	}
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Florian Westphal
40
45.98%
1
16.67%
Alexey Dobriyan
23
26.44%
2
33.33%
Linus Torvalds
17
19.54%
2
33.33%
Jan Engelhardt
7
8.05%
1
16.67%
Total
87
100.00%
6
100.00%



static void __exit ip6table_mangle_fini(void)
{
	unregister_pernet_subsys(&ip6table_mangle_net_ops);
	kfree(mangle_ops);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds
14
70.00%
1
25.00%
Florian Westphal
4
20.00%
1
25.00%
Jan Engelhardt
1
5.00%
1
25.00%
Andrew Morton
1
5.00%
1
25.00%
Total
20
100.00%
4
100.00%


module_init(ip6table_mangle_init);

module_exit(ip6table_mangle_fini);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds
203
32.48%
2
4.88%
Florian Westphal
106
16.96%
2
4.88%
Jan Engelhardt
89
14.24%
7
17.07%
Alexey Dobriyan
74
11.84%
5
12.20%
David S. Miller
31
4.96%
4
9.76%
Patrick McHardy
27
4.32%
6
14.63%
Arnaldo Carvalho de Melo
21
3.36%
1
2.44%
Harald Welte
21
3.36%
3
7.32%
Herbert Xu
12
1.92%
1
2.44%
Eric W. Biedermann
10
1.60%
4
9.76%
Art Haas
10
1.60%
1
2.44%
Hideaki Yoshifuji / 吉藤英明
7
1.12%
1
2.44%
Thomas Graf
7
1.12%
1
2.44%
Andrew Morton
3
0.48%
1
2.44%
Tejun Heo
3
0.48%
1
2.44%
Joe Perches
1
0.16%
1
2.44%
Total
625
100.00%
41
100.00%
Directory: net/ipv6/netfilter

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