1 // SPDX-License-Identifier: GPL-2.0-or-later <<
2 /* 1 /*
3 * IP Payload Compression Protocol (IPComp) fo 2 * IP Payload Compression Protocol (IPComp) for IPv6 - RFC3173
4 * 3 *
5 * Copyright (C)2003 USAGI/WIDE Project 4 * Copyright (C)2003 USAGI/WIDE Project
6 * 5 *
7 * Author Mitsuru KANDA <mk@linux-ipv6. 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/>.
8 */ 20 */
9 /* 21 /*
10 * [Memo] 22 * [Memo]
11 * 23 *
12 * Outbound: 24 * Outbound:
13 * The compression of IP datagram MUST be don 25 * The compression of IP datagram MUST be done before AH/ESP processing,
14 * fragmentation, and the addition of Hop-by- 26 * fragmentation, and the addition of Hop-by-Hop/Routing header.
15 * 27 *
16 * Inbound: 28 * Inbound:
17 * The decompression of IP datagram MUST be d 29 * The decompression of IP datagram MUST be done after the reassembly,
18 * AH/ESP processing. 30 * AH/ESP processing.
19 */ 31 */
20 32
21 #define pr_fmt(fmt) "IPv6: " fmt 33 #define pr_fmt(fmt) "IPv6: " fmt
22 34
23 #include <linux/module.h> 35 #include <linux/module.h>
24 #include <net/ip.h> 36 #include <net/ip.h>
25 #include <net/xfrm.h> 37 #include <net/xfrm.h>
26 #include <net/ipcomp.h> 38 #include <net/ipcomp.h>
27 #include <linux/crypto.h> 39 #include <linux/crypto.h>
28 #include <linux/err.h> 40 #include <linux/err.h>
29 #include <linux/pfkeyv2.h> 41 #include <linux/pfkeyv2.h>
30 #include <linux/random.h> 42 #include <linux/random.h>
31 #include <linux/percpu.h> 43 #include <linux/percpu.h>
32 #include <linux/smp.h> 44 #include <linux/smp.h>
33 #include <linux/list.h> 45 #include <linux/list.h>
34 #include <linux/vmalloc.h> 46 #include <linux/vmalloc.h>
35 #include <linux/rtnetlink.h> 47 #include <linux/rtnetlink.h>
36 #include <net/ip6_route.h> 48 #include <net/ip6_route.h>
37 #include <net/icmp.h> 49 #include <net/icmp.h>
38 #include <net/ipv6.h> 50 #include <net/ipv6.h>
39 #include <net/protocol.h> 51 #include <net/protocol.h>
40 #include <linux/ipv6.h> 52 #include <linux/ipv6.h>
41 #include <linux/icmpv6.h> 53 #include <linux/icmpv6.h>
42 #include <linux/mutex.h> 54 #include <linux/mutex.h>
43 55
44 static int ipcomp6_err(struct sk_buff *skb, st 56 static int ipcomp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
45 u8 type, u8 co 57 u8 type, u8 code, int offset, __be32 info)
46 { 58 {
47 struct net *net = dev_net(skb->dev); 59 struct net *net = dev_net(skb->dev);
48 __be32 spi; 60 __be32 spi;
49 const struct ipv6hdr *iph = (const str 61 const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
50 struct ip_comp_hdr *ipcomph = 62 struct ip_comp_hdr *ipcomph =
51 (struct ip_comp_hdr *)(skb->da 63 (struct ip_comp_hdr *)(skb->data + offset);
52 struct xfrm_state *x; 64 struct xfrm_state *x;
53 65
54 if (type != ICMPV6_PKT_TOOBIG && 66 if (type != ICMPV6_PKT_TOOBIG &&
55 type != NDISC_REDIRECT) 67 type != NDISC_REDIRECT)
56 return 0; 68 return 0;
57 69
58 spi = htonl(ntohs(ipcomph->cpi)); 70 spi = htonl(ntohs(ipcomph->cpi));
59 x = xfrm_state_lookup(net, skb->mark, 71 x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
60 spi, IPPROTO_COM 72 spi, IPPROTO_COMP, AF_INET6);
61 if (!x) 73 if (!x)
62 return 0; 74 return 0;
63 75
64 if (type == NDISC_REDIRECT) 76 if (type == NDISC_REDIRECT)
65 ip6_redirect(skb, net, skb->de 77 ip6_redirect(skb, net, skb->dev->ifindex, 0,
66 sock_net_uid(net, 78 sock_net_uid(net, NULL));
67 else 79 else
68 ip6_update_pmtu(skb, net, info 80 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
69 xfrm_state_put(x); 81 xfrm_state_put(x);
70 82
71 return 0; 83 return 0;
72 } 84 }
73 85
74 static struct xfrm_state *ipcomp6_tunnel_creat 86 static struct xfrm_state *ipcomp6_tunnel_create(struct xfrm_state *x)
75 { 87 {
76 struct net *net = xs_net(x); 88 struct net *net = xs_net(x);
77 struct xfrm_state *t = NULL; 89 struct xfrm_state *t = NULL;
78 90
79 t = xfrm_state_alloc(net); 91 t = xfrm_state_alloc(net);
80 if (!t) 92 if (!t)
81 goto out; 93 goto out;
82 94
83 t->id.proto = IPPROTO_IPV6; 95 t->id.proto = IPPROTO_IPV6;
84 t->id.spi = xfrm6_tunnel_alloc_spi(net 96 t->id.spi = xfrm6_tunnel_alloc_spi(net, (xfrm_address_t *)&x->props.saddr);
85 if (!t->id.spi) 97 if (!t->id.spi)
86 goto error; 98 goto error;
87 99
88 memcpy(t->id.daddr.a6, x->id.daddr.a6, 100 memcpy(t->id.daddr.a6, x->id.daddr.a6, sizeof(struct in6_addr));
89 memcpy(&t->sel, &x->sel, sizeof(t->sel 101 memcpy(&t->sel, &x->sel, sizeof(t->sel));
90 t->props.family = AF_INET6; 102 t->props.family = AF_INET6;
91 t->props.mode = x->props.mode; 103 t->props.mode = x->props.mode;
92 memcpy(t->props.saddr.a6, x->props.sad 104 memcpy(t->props.saddr.a6, x->props.saddr.a6, sizeof(struct in6_addr));
93 memcpy(&t->mark, &x->mark, sizeof(t->m 105 memcpy(&t->mark, &x->mark, sizeof(t->mark));
94 t->if_id = x->if_id; <<
95 106
96 if (xfrm_init_state(t)) 107 if (xfrm_init_state(t))
97 goto error; 108 goto error;
98 109
99 atomic_set(&t->tunnel_users, 1); 110 atomic_set(&t->tunnel_users, 1);
100 111
101 out: 112 out:
102 return t; 113 return t;
103 114
104 error: 115 error:
105 t->km.state = XFRM_STATE_DEAD; 116 t->km.state = XFRM_STATE_DEAD;
106 xfrm_state_put(t); 117 xfrm_state_put(t);
107 t = NULL; 118 t = NULL;
108 goto out; 119 goto out;
109 } 120 }
110 121
111 static int ipcomp6_tunnel_attach(struct xfrm_s 122 static int ipcomp6_tunnel_attach(struct xfrm_state *x)
112 { 123 {
113 struct net *net = xs_net(x); 124 struct net *net = xs_net(x);
114 int err = 0; 125 int err = 0;
115 struct xfrm_state *t = NULL; 126 struct xfrm_state *t = NULL;
116 __be32 spi; 127 __be32 spi;
117 u32 mark = x->mark.m & x->mark.v; 128 u32 mark = x->mark.m & x->mark.v;
118 129
119 spi = xfrm6_tunnel_spi_lookup(net, (xf 130 spi = xfrm6_tunnel_spi_lookup(net, (xfrm_address_t *)&x->props.saddr);
120 if (spi) 131 if (spi)
121 t = xfrm_state_lookup(net, mar 132 t = xfrm_state_lookup(net, mark, (xfrm_address_t *)&x->id.daddr,
122 133 spi, IPPROTO_IPV6, AF_INET6);
123 if (!t) { 134 if (!t) {
124 t = ipcomp6_tunnel_create(x); 135 t = ipcomp6_tunnel_create(x);
125 if (!t) { 136 if (!t) {
126 err = -EINVAL; 137 err = -EINVAL;
127 goto out; 138 goto out;
128 } 139 }
129 xfrm_state_insert(t); 140 xfrm_state_insert(t);
130 xfrm_state_hold(t); 141 xfrm_state_hold(t);
131 } 142 }
132 x->tunnel = t; 143 x->tunnel = t;
133 atomic_inc(&t->tunnel_users); 144 atomic_inc(&t->tunnel_users);
134 145
135 out: 146 out:
136 return err; 147 return err;
137 } 148 }
138 149
139 static int ipcomp6_init_state(struct xfrm_stat !! 150 static int ipcomp6_init_state(struct xfrm_state *x)
140 struct netlink_e <<
141 { 151 {
142 int err = -EINVAL; 152 int err = -EINVAL;
143 153
144 x->props.header_len = 0; 154 x->props.header_len = 0;
145 switch (x->props.mode) { 155 switch (x->props.mode) {
146 case XFRM_MODE_TRANSPORT: 156 case XFRM_MODE_TRANSPORT:
147 break; 157 break;
148 case XFRM_MODE_TUNNEL: 158 case XFRM_MODE_TUNNEL:
149 x->props.header_len += sizeof( 159 x->props.header_len += sizeof(struct ipv6hdr);
150 break; 160 break;
151 default: 161 default:
152 NL_SET_ERR_MSG(extack, "Unsupp <<
153 goto out; 162 goto out;
154 } 163 }
155 164
156 err = ipcomp_init_state(x, extack); !! 165 err = ipcomp_init_state(x);
157 if (err) 166 if (err)
158 goto out; 167 goto out;
159 168
160 if (x->props.mode == XFRM_MODE_TUNNEL) 169 if (x->props.mode == XFRM_MODE_TUNNEL) {
161 err = ipcomp6_tunnel_attach(x) 170 err = ipcomp6_tunnel_attach(x);
162 if (err) { !! 171 if (err)
163 NL_SET_ERR_MSG(extack, <<
164 goto out; 172 goto out;
165 } <<
166 } 173 }
167 174
168 err = 0; 175 err = 0;
169 out: 176 out:
170 return err; 177 return err;
171 } 178 }
172 179
173 static int ipcomp6_rcv_cb(struct sk_buff *skb, 180 static int ipcomp6_rcv_cb(struct sk_buff *skb, int err)
174 { 181 {
175 return 0; 182 return 0;
176 } 183 }
177 184
178 static const struct xfrm_type ipcomp6_type = { 185 static const struct xfrm_type ipcomp6_type = {
>> 186 .description = "IPCOMP6",
179 .owner = THIS_MODULE, 187 .owner = THIS_MODULE,
180 .proto = IPPROTO_COMP, 188 .proto = IPPROTO_COMP,
181 .init_state = ipcomp6_init_state, 189 .init_state = ipcomp6_init_state,
182 .destructor = ipcomp_destroy, 190 .destructor = ipcomp_destroy,
183 .input = ipcomp_input, 191 .input = ipcomp_input,
184 .output = ipcomp_output, 192 .output = ipcomp_output,
>> 193 .hdr_offset = xfrm6_find_1stfragopt,
185 }; 194 };
186 195
187 static struct xfrm6_protocol ipcomp6_protocol 196 static struct xfrm6_protocol ipcomp6_protocol = {
188 .handler = xfrm6_rcv, 197 .handler = xfrm6_rcv,
189 .input_handler = xfrm_input, <<
190 .cb_handler = ipcomp6_rcv_cb, 198 .cb_handler = ipcomp6_rcv_cb,
191 .err_handler = ipcomp6_err, 199 .err_handler = ipcomp6_err,
192 .priority = 0, 200 .priority = 0,
193 }; 201 };
194 202
195 static int __init ipcomp6_init(void) 203 static int __init ipcomp6_init(void)
196 { 204 {
197 if (xfrm_register_type(&ipcomp6_type, 205 if (xfrm_register_type(&ipcomp6_type, AF_INET6) < 0) {
198 pr_info("%s: can't add xfrm ty 206 pr_info("%s: can't add xfrm type\n", __func__);
199 return -EAGAIN; 207 return -EAGAIN;
200 } 208 }
201 if (xfrm6_protocol_register(&ipcomp6_p 209 if (xfrm6_protocol_register(&ipcomp6_protocol, IPPROTO_COMP) < 0) {
202 pr_info("%s: can't add protoco 210 pr_info("%s: can't add protocol\n", __func__);
203 xfrm_unregister_type(&ipcomp6_ 211 xfrm_unregister_type(&ipcomp6_type, AF_INET6);
204 return -EAGAIN; 212 return -EAGAIN;
205 } 213 }
206 return 0; 214 return 0;
207 } 215 }
208 216
209 static void __exit ipcomp6_fini(void) 217 static void __exit ipcomp6_fini(void)
210 { 218 {
211 if (xfrm6_protocol_deregister(&ipcomp6 219 if (xfrm6_protocol_deregister(&ipcomp6_protocol, IPPROTO_COMP) < 0)
212 pr_info("%s: can't remove prot 220 pr_info("%s: can't remove protocol\n", __func__);
213 xfrm_unregister_type(&ipcomp6_type, AF !! 221 if (xfrm_unregister_type(&ipcomp6_type, AF_INET6) < 0)
>> 222 pr_info("%s: can't remove xfrm type\n", __func__);
214 } 223 }
215 224
216 module_init(ipcomp6_init); 225 module_init(ipcomp6_init);
217 module_exit(ipcomp6_fini); 226 module_exit(ipcomp6_fini);
218 MODULE_LICENSE("GPL"); 227 MODULE_LICENSE("GPL");
219 MODULE_DESCRIPTION("IP Payload Compression Pro 228 MODULE_DESCRIPTION("IP Payload Compression Protocol (IPComp) for IPv6 - RFC3173");
220 MODULE_AUTHOR("Mitsuru KANDA <mk@linux-ipv6.or 229 MODULE_AUTHOR("Mitsuru KANDA <mk@linux-ipv6.org>");
221 230
222 MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_CO 231 MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_COMP);
223 232
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