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