Release 4.8 net/ipv6/ipcomp6.c

/*
 * IP Payload Compression Protocol (IPComp) for IPv6 - RFC3173
 *
 * Copyright (C)2003 USAGI/WIDE Project
 *
 * Author       Mitsuru KANDA  <mk@linux-ipv6.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 */
/*
 * [Memo]
 *
 * Outbound:
 *  The compression of IP datagram MUST be done before AH/ESP processing,
 *  fragmentation, and the addition of Hop-by-Hop/Routing header.
 *
 * Inbound:
 *  The decompression of IP datagram MUST be done after the reassembly,
 *  AH/ESP processing.
 */


#define pr_fmt(fmt) "IPv6: " fmt

#include <linux/module.h>
#include <net/ip.h>
#include <net/xfrm.h>
#include <net/ipcomp.h>
#include <linux/crypto.h>
#include <linux/err.h>
#include <linux/pfkeyv2.h>
#include <linux/random.h>
#include <linux/percpu.h>
#include <linux/smp.h>
#include <linux/list.h>
#include <linux/vmalloc.h>
#include <linux/rtnetlink.h>
#include <net/ip6_route.h>
#include <net/icmp.h>
#include <net/ipv6.h>
#include <net/protocol.h>
#include <linux/ipv6.h>
#include <linux/icmpv6.h>
#include <linux/mutex.h>



static int ipcomp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
				u8 type, u8 code, int offset, __be32 info)
{
	struct net *net = dev_net(skb->dev);
	__be32 spi;
	const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
	struct ip_comp_hdr *ipcomph =
		(struct ip_comp_hdr *)(skb->data + offset);
	struct xfrm_state *x;

	if (type != ICMPV6_PKT_TOOBIG &&
	    type != NDISC_REDIRECT)
		return 0;

	spi = htonl(ntohs(ipcomph->cpi));
	x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
			      spi, IPPROTO_COMP, AF_INET6);
	if (!x)
		return 0;

	if (type == NDISC_REDIRECT)
		ip6_redirect(skb, net, skb->dev->ifindex, 0);
	else
		ip6_update_pmtu(skb, net, info, 0, 0);
	xfrm_state_put(x);

	return 0;
}

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herbert xu
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4
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david s. miller
david s. miller
29
15.68%
2
14.29%
mitsuru kanda
mitsuru kanda
25
13.51%
1
7.14%
alexey dobriyan
alexey dobriyan
14
7.57%
2
14.29%
steffen klassert
steffen klassert
10
5.41%
1
7.14%
duan jiong
duan jiong
5
2.70%
1
7.14%
jamal hadi salim
jamal hadi salim
4
2.16%
1
7.14%
eric dumazet
eric dumazet
3
1.62%
1
7.14%
brian haley
brian haley
2
1.08%
1
7.14%
Total
185
100.00%
14
100.00%



static struct xfrm_state *ipcomp6_tunnel_create(struct xfrm_state *x)
{
	struct net *net = xs_net(x);
	struct xfrm_state *t = NULL;

	t = xfrm_state_alloc(net);
	if (!t)
		goto out;

	t->id.proto = IPPROTO_IPV6;
	t->id.spi = xfrm6_tunnel_alloc_spi(net, (xfrm_address_t *)&x->props.saddr);
	if (!t->id.spi)
		goto error;

	memcpy(t->id.daddr.a6, x->id.daddr.a6, sizeof(struct in6_addr));
	memcpy(&t->sel, &x->sel, sizeof(t->sel));
	t->props.family = AF_INET6;
	t->props.mode = x->props.mode;
	memcpy(t->props.saddr.a6, x->props.saddr.a6, sizeof(struct in6_addr));
	memcpy(&t->mark, &x->mark, sizeof(t->mark));

	if (xfrm_init_state(t))
		goto error;

	atomic_set(&t->tunnel_users, 1);

out:
	return t;

error:
	t->km.state = XFRM_STATE_DEAD;
	xfrm_state_put(t);
	t = NULL;
	goto out;
}

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herbert xu
herbert xu
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85.66%
4
50.00%
jamal hadi salim
jamal hadi salim
20
8.20%
1
12.50%
alexey dobriyan
alexey dobriyan
15
6.15%
3
37.50%
Total
244
100.00%
8
100.00%



static int ipcomp6_tunnel_attach(struct xfrm_state *x)
{
	struct net *net = xs_net(x);
	int err = 0;
	struct xfrm_state *t = NULL;
	__be32 spi;
	u32 mark = x->mark.m & x->mark.v;

	spi = xfrm6_tunnel_spi_lookup(net, (xfrm_address_t *)&x->props.saddr);
	if (spi)
		t = xfrm_state_lookup(net, mark, (xfrm_address_t *)&x->id.daddr,
					      spi, IPPROTO_IPV6, AF_INET6);
	if (!t) {
		t = ipcomp6_tunnel_create(x);
		if (!t) {
			err = -EINVAL;
			goto out;
		}
		xfrm_state_insert(t);
		xfrm_state_hold(t);
	}
	x->tunnel = t;
	atomic_inc(&t->tunnel_users);

out:
	return err;
}

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herbert xu
herbert xu
126
80.25%
2
33.33%
jamal hadi salim
jamal hadi salim
17
10.83%
1
16.67%
alexey dobriyan
alexey dobriyan
14
8.92%
3
50.00%
Total
157
100.00%
6
100.00%



static int ipcomp6_init_state(struct xfrm_state *x)
{
	int err = -EINVAL;

	x->props.header_len = 0;
	switch (x->props.mode) {
	case XFRM_MODE_TRANSPORT:
		break;
	case XFRM_MODE_TUNNEL:
		x->props.header_len += sizeof(struct ipv6hdr);
		break;
	default:
		goto out;
	}

	err = ipcomp_init_state(x);
	if (err)
		goto out;

	if (x->props.mode == XFRM_MODE_TUNNEL) {
		err = ipcomp6_tunnel_attach(x);
		if (err)
			goto out;
	}

	err = 0;
out:
	return err;
}

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mitsuru kanda
mitsuru kanda
55
50.93%
1
10.00%
herbert xu
herbert xu
25
23.15%
6
60.00%
hideaki yoshifuji
hideaki yoshifuji
23
21.30%
1
10.00%
david s. miller
david s. miller
3
2.78%
1
10.00%
masahide nakamura
masahide nakamura
2
1.85%
1
10.00%
Total
108
100.00%
10
100.00%



static int ipcomp6_rcv_cb(struct sk_buff *skb, int err)
{
	return 0;
}

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17
100.00%
1
100.00%


static const struct xfrm_type ipcomp6_type = {
	.description	= "IPCOMP6",
	.owner		= THIS_MODULE,
	.proto		= IPPROTO_COMP,
	.init_state	= ipcomp6_init_state,
	.destructor	= ipcomp_destroy,
	.input		= ipcomp_input,
	.output		= ipcomp_output,
	.hdr_offset	= xfrm6_find_1stfragopt,
};


static struct xfrm6_protocol ipcomp6_protocol = {
	.handler	= xfrm6_rcv,
	.cb_handler	= ipcomp6_rcv_cb,
	.err_handler	= ipcomp6_err,
	.priority	= 0,
};



static int __init ipcomp6_init(void)
{
	if (xfrm_register_type(&ipcomp6_type, AF_INET6) < 0) {
		pr_info("%s: can't add xfrm type\n", __func__);
		return -EAGAIN;
	}
	if (xfrm6_protocol_register(&ipcomp6_protocol, IPPROTO_COMP) < 0) {
		pr_info("%s: can't add protocol\n", __func__);
		xfrm_unregister_type(&ipcomp6_type, AF_INET6);
		return -EAGAIN;
	}
	return 0;
}

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mitsuru kanda
61
87.14%
1
33.33%
joe perches
joe perches
8
11.43%
1
33.33%
steffen klassert
steffen klassert
1
1.43%
1
33.33%
Total
70
100.00%
3
100.00%



static void __exit ipcomp6_fini(void)
{
	if (xfrm6_protocol_deregister(&ipcomp6_protocol, IPPROTO_COMP) < 0)
		pr_info("%s: can't remove protocol\n", __func__);
	if (xfrm_unregister_type(&ipcomp6_type, AF_INET6) < 0)
		pr_info("%s: can't remove xfrm type\n", __func__);
}

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mitsuru kanda
mitsuru kanda
38
80.85%
1
33.33%
joe perches
joe perches
8
17.02%
1
33.33%
steffen klassert
steffen klassert
1
2.13%
1
33.33%
Total
47
100.00%
3
100.00%


module_init(ipcomp6_init);

module_exit(ipcomp6_fini);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("IP Payload Compression Protocol (IPComp) for IPv6 - RFC3173");
MODULE_AUTHOR("Mitsuru KANDA <mk@linux-ipv6.org>");

MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_COMP);
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herbert xu
herbert xu
474
47.21%
10
30.30%
mitsuru kanda
mitsuru kanda
295
29.38%
1
3.03%
alexey dobriyan
alexey dobriyan
43
4.28%
4
12.12%
jamal hadi salim
jamal hadi salim
41
4.08%
1
3.03%
steffen klassert
steffen klassert
37
3.69%
1
3.03%
david s. miller
david s. miller
35
3.49%
3
9.09%
hideaki yoshifuji
hideaki yoshifuji
24
2.39%
2
6.06%
joe perches
joe perches
23
2.29%
1
3.03%
masahide nakamura
masahide nakamura
14
1.39%
3
9.09%
duan jiong
duan jiong
5
0.50%
1
3.03%
eric dumazet
eric dumazet
4
0.40%
2
6.06%
arnaldo carvalho de melo
arnaldo carvalho de melo
3
0.30%
1
3.03%
arjan van de ven
arjan van de ven
3
0.30%
1
3.03%
brian haley
brian haley
2
0.20%
1
3.03%
jeff kirsher
jeff kirsher
1
0.10%
1
3.03%
Total
1004
100.00%
33
100.00%
  
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