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1/*
2 * IP Payload Compression Protocol (IPComp) for IPv6 - RFC3173
3 *
4 * Copyright (C)2003 USAGI/WIDE Project
5 *
6 * Author Mitsuru KANDA <mk@linux-ipv6.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, see <http://www.gnu.org/licenses/>.
20 */
21/*
22 * [Memo]
23 *
24 * Outbound:
25 * The compression of IP datagram MUST be done before AH/ESP processing,
26 * fragmentation, and the addition of Hop-by-Hop/Routing header.
27 *
28 * Inbound:
29 * The decompression of IP datagram MUST be done after the reassembly,
30 * AH/ESP processing.
31 */
32
33#define pr_fmt(fmt) "IPv6: " fmt
34
35#include <linux/module.h>
36#include <net/ip.h>
37#include <net/xfrm.h>
38#include <net/ipcomp.h>
39#include <linux/crypto.h>
40#include <linux/err.h>
41#include <linux/pfkeyv2.h>
42#include <linux/random.h>
43#include <linux/percpu.h>
44#include <linux/smp.h>
45#include <linux/list.h>
46#include <linux/vmalloc.h>
47#include <linux/rtnetlink.h>
48#include <net/ip6_route.h>
49#include <net/icmp.h>
50#include <net/ipv6.h>
51#include <net/protocol.h>
52#include <linux/ipv6.h>
53#include <linux/icmpv6.h>
54#include <linux/mutex.h>
55
56static int ipcomp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
57 u8 type, u8 code, int offset, __be32 info)
58{
59 struct net *net = dev_net(skb->dev);
60 __be32 spi;
61 const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
62 struct ip_comp_hdr *ipcomph =
63 (struct ip_comp_hdr *)(skb->data + offset);
64 struct xfrm_state *x;
65
66 if (type != ICMPV6_PKT_TOOBIG &&
67 type != NDISC_REDIRECT)
68 return 0;
69
70 spi = htonl(ntohs(ipcomph->cpi));
71 x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
72 spi, IPPROTO_COMP, AF_INET6);
73 if (!x)
74 return 0;
75
76 if (type == NDISC_REDIRECT)
77 ip6_redirect(skb, net, skb->dev->ifindex, 0);
78 else
79 ip6_update_pmtu(skb, net, info, 0, 0);
80 xfrm_state_put(x);
81
82 return 0;
83}
84
85static struct xfrm_state *ipcomp6_tunnel_create(struct xfrm_state *x)
86{
87 struct net *net = xs_net(x);
88 struct xfrm_state *t = NULL;
89
90 t = xfrm_state_alloc(net);
91 if (!t)
92 goto out;
93
94 t->id.proto = IPPROTO_IPV6;
95 t->id.spi = xfrm6_tunnel_alloc_spi(net, (xfrm_address_t *)&x->props.saddr);
96 if (!t->id.spi)
97 goto error;
98
99 memcpy(t->id.daddr.a6, x->id.daddr.a6, sizeof(struct in6_addr));
100 memcpy(&t->sel, &x->sel, sizeof(t->sel));
101 t->props.family = AF_INET6;
102 t->props.mode = x->props.mode;
103 memcpy(t->props.saddr.a6, x->props.saddr.a6, sizeof(struct in6_addr));
104 memcpy(&t->mark, &x->mark, sizeof(t->mark));
105
106 if (xfrm_init_state(t))
107 goto error;
108
109 atomic_set(&t->tunnel_users, 1);
110
111out:
112 return t;
113
114error:
115 t->km.state = XFRM_STATE_DEAD;
116 xfrm_state_put(t);
117 t = NULL;
118 goto out;
119}
120
121static int ipcomp6_tunnel_attach(struct xfrm_state *x)
122{
123 struct net *net = xs_net(x);
124 int err = 0;
125 struct xfrm_state *t = NULL;
126 __be32 spi;
127 u32 mark = x->mark.m & x->mark.v;
128
129 spi = xfrm6_tunnel_spi_lookup(net, (xfrm_address_t *)&x->props.saddr);
130 if (spi)
131 t = xfrm_state_lookup(net, mark, (xfrm_address_t *)&x->id.daddr,
132 spi, IPPROTO_IPV6, AF_INET6);
133 if (!t) {
134 t = ipcomp6_tunnel_create(x);
135 if (!t) {
136 err = -EINVAL;
137 goto out;
138 }
139 xfrm_state_insert(t);
140 xfrm_state_hold(t);
141 }
142 x->tunnel = t;
143 atomic_inc(&t->tunnel_users);
144
145out:
146 return err;
147}
148
149static int ipcomp6_init_state(struct xfrm_state *x)
150{
151 int err = -EINVAL;
152
153 x->props.header_len = 0;
154 switch (x->props.mode) {
155 case XFRM_MODE_TRANSPORT:
156 break;
157 case XFRM_MODE_TUNNEL:
158 x->props.header_len += sizeof(struct ipv6hdr);
159 break;
160 default:
161 goto out;
162 }
163
164 err = ipcomp_init_state(x);
165 if (err)
166 goto out;
167
168 if (x->props.mode == XFRM_MODE_TUNNEL) {
169 err = ipcomp6_tunnel_attach(x);
170 if (err)
171 goto out;
172 }
173
174 err = 0;
175out:
176 return err;
177}
178
179static int ipcomp6_rcv_cb(struct sk_buff *skb, int err)
180{
181 return 0;
182}
183
184static const struct xfrm_type ipcomp6_type =
185{
186 .description = "IPCOMP6",
187 .owner = THIS_MODULE,
188 .proto = IPPROTO_COMP,
189 .init_state = ipcomp6_init_state,
190 .destructor = ipcomp_destroy,
191 .input = ipcomp_input,
192 .output = ipcomp_output,
193 .hdr_offset = xfrm6_find_1stfragopt,
194};
195
196static struct xfrm6_protocol ipcomp6_protocol =
197{
198 .handler = xfrm6_rcv,
199 .cb_handler = ipcomp6_rcv_cb,
200 .err_handler = ipcomp6_err,
201 .priority = 0,
202};
203
204static int __init ipcomp6_init(void)
205{
206 if (xfrm_register_type(&ipcomp6_type, AF_INET6) < 0) {
207 pr_info("%s: can't add xfrm type\n", __func__);
208 return -EAGAIN;
209 }
210 if (xfrm6_protocol_register(&ipcomp6_protocol, IPPROTO_COMP) < 0) {
211 pr_info("%s: can't add protocol\n", __func__);
212 xfrm_unregister_type(&ipcomp6_type, AF_INET6);
213 return -EAGAIN;
214 }
215 return 0;
216}
217
218static void __exit ipcomp6_fini(void)
219{
220 if (xfrm6_protocol_deregister(&ipcomp6_protocol, IPPROTO_COMP) < 0)
221 pr_info("%s: can't remove protocol\n", __func__);
222 if (xfrm_unregister_type(&ipcomp6_type, AF_INET6) < 0)
223 pr_info("%s: can't remove xfrm type\n", __func__);
224}
225
226module_init(ipcomp6_init);
227module_exit(ipcomp6_fini);
228MODULE_LICENSE("GPL");
229MODULE_DESCRIPTION("IP Payload Compression Protocol (IPComp) for IPv6 - RFC3173");
230MODULE_AUTHOR("Mitsuru KANDA <mk@linux-ipv6.org>");
231
232MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_COMP);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * IP Payload Compression Protocol (IPComp) for IPv6 - RFC3173
4 *
5 * Copyright (C)2003 USAGI/WIDE Project
6 *
7 * Author Mitsuru KANDA <mk@linux-ipv6.org>
8 */
9/*
10 * [Memo]
11 *
12 * Outbound:
13 * The compression of IP datagram MUST be done before AH/ESP processing,
14 * fragmentation, and the addition of Hop-by-Hop/Routing header.
15 *
16 * Inbound:
17 * The decompression of IP datagram MUST be done after the reassembly,
18 * AH/ESP processing.
19 */
20
21#define pr_fmt(fmt) "IPv6: " fmt
22
23#include <linux/module.h>
24#include <net/ip.h>
25#include <net/xfrm.h>
26#include <net/ipcomp.h>
27#include <linux/crypto.h>
28#include <linux/err.h>
29#include <linux/pfkeyv2.h>
30#include <linux/random.h>
31#include <linux/percpu.h>
32#include <linux/smp.h>
33#include <linux/list.h>
34#include <linux/vmalloc.h>
35#include <linux/rtnetlink.h>
36#include <net/ip6_route.h>
37#include <net/icmp.h>
38#include <net/ipv6.h>
39#include <net/protocol.h>
40#include <linux/ipv6.h>
41#include <linux/icmpv6.h>
42#include <linux/mutex.h>
43
44static int ipcomp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
45 u8 type, u8 code, int offset, __be32 info)
46{
47 struct net *net = dev_net(skb->dev);
48 __be32 spi;
49 const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
50 struct ip_comp_hdr *ipcomph =
51 (struct ip_comp_hdr *)(skb->data + offset);
52 struct xfrm_state *x;
53
54 if (type != ICMPV6_PKT_TOOBIG &&
55 type != NDISC_REDIRECT)
56 return 0;
57
58 spi = htonl(ntohs(ipcomph->cpi));
59 x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
60 spi, IPPROTO_COMP, AF_INET6);
61 if (!x)
62 return 0;
63
64 if (type == NDISC_REDIRECT)
65 ip6_redirect(skb, net, skb->dev->ifindex, 0,
66 sock_net_uid(net, NULL));
67 else
68 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
69 xfrm_state_put(x);
70
71 return 0;
72}
73
74static struct xfrm_state *ipcomp6_tunnel_create(struct xfrm_state *x)
75{
76 struct net *net = xs_net(x);
77 struct xfrm_state *t = NULL;
78
79 t = xfrm_state_alloc(net);
80 if (!t)
81 goto out;
82
83 t->id.proto = IPPROTO_IPV6;
84 t->id.spi = xfrm6_tunnel_alloc_spi(net, (xfrm_address_t *)&x->props.saddr);
85 if (!t->id.spi)
86 goto error;
87
88 memcpy(t->id.daddr.a6, x->id.daddr.a6, sizeof(struct in6_addr));
89 memcpy(&t->sel, &x->sel, sizeof(t->sel));
90 t->props.family = AF_INET6;
91 t->props.mode = x->props.mode;
92 memcpy(t->props.saddr.a6, x->props.saddr.a6, sizeof(struct in6_addr));
93 memcpy(&t->mark, &x->mark, sizeof(t->mark));
94 t->if_id = x->if_id;
95
96 if (xfrm_init_state(t))
97 goto error;
98
99 atomic_set(&t->tunnel_users, 1);
100
101out:
102 return t;
103
104error:
105 t->km.state = XFRM_STATE_DEAD;
106 xfrm_state_put(t);
107 t = NULL;
108 goto out;
109}
110
111static int ipcomp6_tunnel_attach(struct xfrm_state *x)
112{
113 struct net *net = xs_net(x);
114 int err = 0;
115 struct xfrm_state *t = NULL;
116 __be32 spi;
117 u32 mark = x->mark.m & x->mark.v;
118
119 spi = xfrm6_tunnel_spi_lookup(net, (xfrm_address_t *)&x->props.saddr);
120 if (spi)
121 t = xfrm_state_lookup(net, mark, (xfrm_address_t *)&x->id.daddr,
122 spi, IPPROTO_IPV6, AF_INET6);
123 if (!t) {
124 t = ipcomp6_tunnel_create(x);
125 if (!t) {
126 err = -EINVAL;
127 goto out;
128 }
129 xfrm_state_insert(t);
130 xfrm_state_hold(t);
131 }
132 x->tunnel = t;
133 atomic_inc(&t->tunnel_users);
134
135out:
136 return err;
137}
138
139static int ipcomp6_init_state(struct xfrm_state *x)
140{
141 int err = -EINVAL;
142
143 x->props.header_len = 0;
144 switch (x->props.mode) {
145 case XFRM_MODE_TRANSPORT:
146 break;
147 case XFRM_MODE_TUNNEL:
148 x->props.header_len += sizeof(struct ipv6hdr);
149 break;
150 default:
151 goto out;
152 }
153
154 err = ipcomp_init_state(x);
155 if (err)
156 goto out;
157
158 if (x->props.mode == XFRM_MODE_TUNNEL) {
159 err = ipcomp6_tunnel_attach(x);
160 if (err)
161 goto out;
162 }
163
164 err = 0;
165out:
166 return err;
167}
168
169static int ipcomp6_rcv_cb(struct sk_buff *skb, int err)
170{
171 return 0;
172}
173
174static const struct xfrm_type ipcomp6_type = {
175 .owner = THIS_MODULE,
176 .proto = IPPROTO_COMP,
177 .init_state = ipcomp6_init_state,
178 .destructor = ipcomp_destroy,
179 .input = ipcomp_input,
180 .output = ipcomp_output,
181};
182
183static struct xfrm6_protocol ipcomp6_protocol = {
184 .handler = xfrm6_rcv,
185 .input_handler = xfrm_input,
186 .cb_handler = ipcomp6_rcv_cb,
187 .err_handler = ipcomp6_err,
188 .priority = 0,
189};
190
191static int __init ipcomp6_init(void)
192{
193 if (xfrm_register_type(&ipcomp6_type, AF_INET6) < 0) {
194 pr_info("%s: can't add xfrm type\n", __func__);
195 return -EAGAIN;
196 }
197 if (xfrm6_protocol_register(&ipcomp6_protocol, IPPROTO_COMP) < 0) {
198 pr_info("%s: can't add protocol\n", __func__);
199 xfrm_unregister_type(&ipcomp6_type, AF_INET6);
200 return -EAGAIN;
201 }
202 return 0;
203}
204
205static void __exit ipcomp6_fini(void)
206{
207 if (xfrm6_protocol_deregister(&ipcomp6_protocol, IPPROTO_COMP) < 0)
208 pr_info("%s: can't remove protocol\n", __func__);
209 xfrm_unregister_type(&ipcomp6_type, AF_INET6);
210}
211
212module_init(ipcomp6_init);
213module_exit(ipcomp6_fini);
214MODULE_LICENSE("GPL");
215MODULE_DESCRIPTION("IP Payload Compression Protocol (IPComp) for IPv6 - RFC3173");
216MODULE_AUTHOR("Mitsuru KANDA <mk@linux-ipv6.org>");
217
218MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_COMP);