Commit | Line | Data |
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1ccea77e | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
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> | |
1da177e4 | 8 | */ |
1ab1457c | 9 | /* |
1da177e4 LT |
10 | * [Memo] |
11 | * | |
12 | * Outbound: | |
1ab1457c YH |
13 | * The compression of IP datagram MUST be done before AH/ESP processing, |
14 | * fragmentation, and the addition of Hop-by-Hop/Routing header. | |
1da177e4 LT |
15 | * |
16 | * Inbound: | |
1ab1457c | 17 | * The decompression of IP datagram MUST be done after the reassembly, |
1da177e4 LT |
18 | * AH/ESP processing. |
19 | */ | |
f3213831 JP |
20 | |
21 | #define pr_fmt(fmt) "IPv6: " fmt | |
22 | ||
1da177e4 LT |
23 | #include <linux/module.h> |
24 | #include <net/ip.h> | |
25 | #include <net/xfrm.h> | |
26 | #include <net/ipcomp.h> | |
1da177e4 | 27 | #include <linux/crypto.h> |
4999f362 | 28 | #include <linux/err.h> |
1da177e4 LT |
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> | |
81aded24 | 36 | #include <net/ip6_route.h> |
1da177e4 LT |
37 | #include <net/icmp.h> |
38 | #include <net/ipv6.h> | |
14c85021 | 39 | #include <net/protocol.h> |
1da177e4 LT |
40 | #include <linux/ipv6.h> |
41 | #include <linux/icmpv6.h> | |
4a3e2f71 | 42 | #include <linux/mutex.h> |
1da177e4 | 43 | |
59b84351 | 44 | static int ipcomp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 45 | u8 type, u8 code, int offset, __be32 info) |
1da177e4 | 46 | { |
d74340d3 | 47 | struct net *net = dev_net(skb->dev); |
a94cfd19 | 48 | __be32 spi; |
b71d1d42 | 49 | const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data; |
87bdc48d HX |
50 | struct ip_comp_hdr *ipcomph = |
51 | (struct ip_comp_hdr *)(skb->data + offset); | |
1da177e4 LT |
52 | struct xfrm_state *x; |
53 | ||
b3b2b9e1 | 54 | if (type != ICMPV6_PKT_TOOBIG && |
ec18d9a2 | 55 | type != NDISC_REDIRECT) |
59b84351 | 56 | return 0; |
1da177e4 | 57 | |
4195f814 | 58 | spi = htonl(ntohs(ipcomph->cpi)); |
b71d1d42 ED |
59 | x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr, |
60 | spi, IPPROTO_COMP, AF_INET6); | |
1da177e4 | 61 | if (!x) |
59b84351 | 62 | return 0; |
1da177e4 | 63 | |
ec18d9a2 | 64 | if (type == NDISC_REDIRECT) |
e2d118a1 LC |
65 | ip6_redirect(skb, net, skb->dev->ifindex, 0, |
66 | sock_net_uid(net, NULL)); | |
ec18d9a2 | 67 | else |
e2d118a1 | 68 | ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); |
1da177e4 | 69 | xfrm_state_put(x); |
59b84351 SK |
70 | |
71 | return 0; | |
1da177e4 LT |
72 | } |
73 | ||
74 | static struct xfrm_state *ipcomp6_tunnel_create(struct xfrm_state *x) | |
75 | { | |
d74340d3 | 76 | struct net *net = xs_net(x); |
1da177e4 LT |
77 | struct xfrm_state *t = NULL; |
78 | ||
d74340d3 | 79 | t = xfrm_state_alloc(net); |
1da177e4 LT |
80 | if (!t) |
81 | goto out; | |
82 | ||
83 | t->id.proto = IPPROTO_IPV6; | |
d74340d3 | 84 | t->id.spi = xfrm6_tunnel_alloc_spi(net, (xfrm_address_t *)&x->props.saddr); |
6abaaaae HX |
85 | if (!t->id.spi) |
86 | goto error; | |
87 | ||
1da177e4 LT |
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; | |
e40b3286 | 91 | t->props.mode = x->props.mode; |
1da177e4 | 92 | memcpy(t->props.saddr.a6, x->props.saddr.a6, sizeof(struct in6_addr)); |
bd55775c | 93 | memcpy(&t->mark, &x->mark, sizeof(t->mark)); |
d5a7a505 | 94 | t->if_id = x->if_id; |
1da177e4 | 95 | |
72cb6962 | 96 | if (xfrm_init_state(t)) |
1da177e4 LT |
97 | goto error; |
98 | ||
1da177e4 LT |
99 | atomic_set(&t->tunnel_users, 1); |
100 | ||
101 | out: | |
102 | return t; | |
103 | ||
104 | error: | |
6abaaaae | 105 | t->km.state = XFRM_STATE_DEAD; |
1da177e4 | 106 | xfrm_state_put(t); |
6abaaaae | 107 | t = NULL; |
1da177e4 LT |
108 | goto out; |
109 | } | |
110 | ||
111 | static int ipcomp6_tunnel_attach(struct xfrm_state *x) | |
112 | { | |
d74340d3 | 113 | struct net *net = xs_net(x); |
1da177e4 LT |
114 | int err = 0; |
115 | struct xfrm_state *t = NULL; | |
a94cfd19 | 116 | __be32 spi; |
bd55775c | 117 | u32 mark = x->mark.m & x->mark.v; |
1da177e4 | 118 | |
d74340d3 | 119 | spi = xfrm6_tunnel_spi_lookup(net, (xfrm_address_t *)&x->props.saddr); |
1da177e4 | 120 | if (spi) |
bd55775c | 121 | t = xfrm_state_lookup(net, mark, (xfrm_address_t *)&x->id.daddr, |
1da177e4 LT |
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 | ||
135 | out: | |
136 | return err; | |
137 | } | |
138 | ||
72cb6962 | 139 | static int ipcomp6_init_state(struct xfrm_state *x) |
1da177e4 | 140 | { |
2c3abab7 | 141 | int err = -EINVAL; |
1da177e4 | 142 | |
1da177e4 | 143 | x->props.header_len = 0; |
ca68145f | 144 | switch (x->props.mode) { |
ca68145f HX |
145 | case XFRM_MODE_TRANSPORT: |
146 | break; | |
147 | case XFRM_MODE_TUNNEL: | |
1da177e4 | 148 | x->props.header_len += sizeof(struct ipv6hdr); |
e40b3286 | 149 | break; |
ca68145f | 150 | default: |
e40b3286 | 151 | goto out; |
ca68145f | 152 | } |
1ab1457c | 153 | |
6fccab67 HX |
154 | err = ipcomp_init_state(x); |
155 | if (err) | |
e40b3286 HX |
156 | goto out; |
157 | ||
7e49e6de | 158 | if (x->props.mode == XFRM_MODE_TUNNEL) { |
1da177e4 LT |
159 | err = ipcomp6_tunnel_attach(x); |
160 | if (err) | |
10e7454e | 161 | goto out; |
1da177e4 LT |
162 | } |
163 | ||
1da177e4 LT |
164 | err = 0; |
165 | out: | |
166 | return err; | |
1da177e4 LT |
167 | } |
168 | ||
59b84351 SK |
169 | static int ipcomp6_rcv_cb(struct sk_buff *skb, int err) |
170 | { | |
171 | return 0; | |
172 | } | |
173 | ||
cc24beca | 174 | static const struct xfrm_type ipcomp6_type = { |
1da177e4 LT |
175 | .description = "IPCOMP6", |
176 | .owner = THIS_MODULE, | |
177 | .proto = IPPROTO_COMP, | |
178 | .init_state = ipcomp6_init_state, | |
6fccab67 HX |
179 | .destructor = ipcomp_destroy, |
180 | .input = ipcomp_input, | |
181 | .output = ipcomp_output, | |
aee5adb4 | 182 | .hdr_offset = xfrm6_find_1stfragopt, |
1da177e4 LT |
183 | }; |
184 | ||
cc24beca | 185 | static struct xfrm6_protocol ipcomp6_protocol = { |
1da177e4 | 186 | .handler = xfrm6_rcv, |
0146dca7 | 187 | .input_handler = xfrm_input, |
59b84351 | 188 | .cb_handler = ipcomp6_rcv_cb, |
1da177e4 | 189 | .err_handler = ipcomp6_err, |
59b84351 | 190 | .priority = 0, |
1da177e4 LT |
191 | }; |
192 | ||
193 | static int __init ipcomp6_init(void) | |
194 | { | |
195 | if (xfrm_register_type(&ipcomp6_type, AF_INET6) < 0) { | |
f3213831 | 196 | pr_info("%s: can't add xfrm type\n", __func__); |
1da177e4 LT |
197 | return -EAGAIN; |
198 | } | |
59b84351 | 199 | if (xfrm6_protocol_register(&ipcomp6_protocol, IPPROTO_COMP) < 0) { |
f3213831 | 200 | pr_info("%s: can't add protocol\n", __func__); |
1da177e4 LT |
201 | xfrm_unregister_type(&ipcomp6_type, AF_INET6); |
202 | return -EAGAIN; | |
203 | } | |
204 | return 0; | |
205 | } | |
206 | ||
207 | static void __exit ipcomp6_fini(void) | |
208 | { | |
59b84351 | 209 | if (xfrm6_protocol_deregister(&ipcomp6_protocol, IPPROTO_COMP) < 0) |
f3213831 | 210 | pr_info("%s: can't remove protocol\n", __func__); |
4f518e80 | 211 | xfrm_unregister_type(&ipcomp6_type, AF_INET6); |
1da177e4 LT |
212 | } |
213 | ||
214 | module_init(ipcomp6_init); | |
215 | module_exit(ipcomp6_fini); | |
216 | MODULE_LICENSE("GPL"); | |
217 | MODULE_DESCRIPTION("IP Payload Compression Protocol (IPComp) for IPv6 - RFC3173"); | |
218 | MODULE_AUTHOR("Mitsuru KANDA <mk@linux-ipv6.org>"); | |
219 | ||
d3d6dd3a | 220 | MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_COMP); |