Release 4.11 net/ipv4/ipcomp.c

/*
 * IP Payload Compression Protocol (IPComp) - RFC3173.
 *
 * Copyright (c) 2003 James Morris <jmorris@intercode.com.au>
 *
 * 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.
 *
 * Todo:
 *   - Tunable compression parameters.
 *   - Compression stats.
 *   - Adaptive compression.
 */
#include <linux/module.h>
#include <linux/err.h>
#include <linux/rtnetlink.h>
#include <net/ip.h>
#include <net/xfrm.h>
#include <net/icmp.h>
#include <net/ipcomp.h>
#include <net/protocol.h>
#include <net/sock.h>



static int ipcomp4_err(struct sk_buff *skb, u32 info)
{
	struct net *net = dev_net(skb->dev);
	__be32 spi;
	const struct iphdr *iph = (const struct iphdr *)skb->data;
	struct ip_comp_hdr *ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2));
	struct xfrm_state *x;

	switch (icmp_hdr(skb)->type) {
	case ICMP_DEST_UNREACH:
		if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
			return 0;
	case ICMP_REDIRECT:
		break;
	default:
		return 0;
	}

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

	if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
		ipv4_update_pmtu(skb, net, info, 0, 0, IPPROTO_COMP, 0);
	else
		ipv4_redirect(skb, net, 0, 0, IPPROTO_COMP, 0);
	xfrm_state_put(x);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Herbert Xu
76
36.36%
1
10.00%
David S. Miller
55
26.32%
2
20.00%
James Morris
36
17.22%
1
10.00%
Alexey Dobriyan
14
6.70%
2
20.00%
Steffen Klassert
13
6.22%
1
10.00%
Arnaldo Carvalho de Melo
8
3.83%
1
10.00%
Jamal Hadi Salim
4
1.91%
1
10.00%
Eric Dumazet
3
1.44%
1
10.00%
Total
209
100.00%
10
100.00%

/* We always hold one tunnel user reference to indicate a tunnel */


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

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

	t->id.proto = IPPROTO_IPIP;
	t->id.spi = x->props.saddr.a4;
	t->id.daddr.a4 = x->id.daddr.a4;
	memcpy(&t->sel, &x->sel, sizeof(t->sel));
	t->props.family = AF_INET;
	t->props.mode = x->props.mode;
	t->props.saddr.a4 = x->props.saddr.a4;
	t->props.flags = x->props.flags;
	t->props.extra_flags = x->props.extra_flags;
	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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Herbert Xu
141
61.84%
7
50.00%
James Morris
40
17.54%
1
7.14%
Jamal Hadi Salim
20
8.77%
1
7.14%
Alexey Dobriyan
13
5.70%
2
14.29%
Nicolas Dichtel
12
5.26%
1
7.14%
Ian Morris
1
0.44%
1
7.14%
Mitsuru Kanda
1
0.44%
1
7.14%
Total
228
100.00%
14
100.00%

/*
 * Must be protected by xfrm_cfg_mutex.  State and tunnel user references are
 * always incremented on success.
 */


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

	t = xfrm_state_lookup(net, mark, (xfrm_address_t *)&x->id.daddr.a4,
			      x->props.saddr.a4, IPPROTO_IPIP, AF_INET);
	if (!t) {
		t = ipcomp_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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Herbert Xu
109
78.99%
2
40.00%
Jamal Hadi Salim
17
12.32%
1
20.00%
Alexey Dobriyan
12
8.70%
2
40.00%
Total
138
100.00%
5
100.00%



static int ipcomp4_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 iphdr);
		break;
	default:
		goto out;
	}

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

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

	err = 0;
out:
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
James Morris
69
63.89%
2
22.22%
Herbert Xu
34
31.48%
5
55.56%
David S. Miller
3
2.78%
1
11.11%
Masahide Nakamura
2
1.85%
1
11.11%
Total
108
100.00%
9
100.00%



static int ipcomp4_rcv_cb(struct sk_buff *skb, int err)
{
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steffen Klassert
17
100.00%
1
100.00%
Total
17
100.00%
1
100.00%


static const struct xfrm_type ipcomp_type = {
	.description	= "IPCOMP4",
	.owner		= THIS_MODULE,
	.proto	     	= IPPROTO_COMP,
	.init_state	= ipcomp4_init_state,
	.destructor	= ipcomp_destroy,
	.input		= ipcomp_input,
	.output		= ipcomp_output
};


static struct xfrm4_protocol ipcomp4_protocol = {
	.handler	=	xfrm4_rcv,
	.input_handler	=	xfrm_input,
	.cb_handler	=	ipcomp4_rcv_cb,
	.err_handler	=	ipcomp4_err,
	.priority	=	0,
};



static int __init ipcomp4_init(void)
{
	if (xfrm_register_type(&ipcomp_type, AF_INET) < 0) {
		pr_info("%s: can't add xfrm type\n", __func__);
		return -EAGAIN;
	}
	if (xfrm4_protocol_register(&ipcomp4_protocol, IPPROTO_COMP) < 0) {
		pr_info("%s: can't add protocol\n", __func__);
		xfrm_unregister_type(&ipcomp_type, AF_INET);
		return -EAGAIN;
	}
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
James Morris
61
87.14%
1
33.33%
Joe Perches
8
11.43%
1
33.33%
Steffen Klassert
1
1.43%
1
33.33%
Total
70
100.00%
3
100.00%



static void __exit ipcomp4_fini(void)
{
	if (xfrm4_protocol_deregister(&ipcomp4_protocol, IPPROTO_COMP) < 0)
		pr_info("%s: can't remove protocol\n", __func__);
	if (xfrm_unregister_type(&ipcomp_type, AF_INET) < 0)
		pr_info("%s: can't remove xfrm type\n", __func__);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
James Morris
38
80.85%
1
33.33%
Joe Perches
8
17.02%
1
33.33%
Steffen Klassert
1
2.13%
1
33.33%
Total
47
100.00%
3
100.00%


module_init(ipcomp4_init);

module_exit(ipcomp4_fini);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("IP Payload Compression Protocol (IPComp/IPv4) - RFC3173");
MODULE_AUTHOR("James Morris <jmorris@intercode.com.au>");

MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_COMP);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Herbert Xu
373
39.10%
11
31.43%
James Morris
335
35.12%
2
5.71%
David S. Miller
61
6.39%
4
11.43%
Steffen Klassert
44
4.61%
1
2.86%
Jamal Hadi Salim
41
4.30%
1
2.86%
Alexey Dobriyan
39
4.09%
3
8.57%
Joe Perches
16
1.68%
1
2.86%
Nicolas Dichtel
12
1.26%
1
2.86%
Arnaldo Carvalho de Melo
11
1.15%
2
5.71%
Masahide Nakamura
9
0.94%
2
5.71%
Thomas Schlichter
5
0.52%
1
2.86%
Eric Dumazet
4
0.42%
2
5.71%
Mitsuru Kanda
2
0.21%
2
5.71%
Hideaki Yoshifuji / 吉藤英明
1
0.10%
1
2.86%
Ian Morris
1
0.10%
1
2.86%
Total
954
100.00%
35
100.00%
Directory: net/ipv4

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