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Linux/net/ipv6/ipcomp6.c

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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 
 56 static 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 
 85 static 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 
111 out:
112         return t;
113 
114 error:
115         t->km.state = XFRM_STATE_DEAD;
116         xfrm_state_put(t);
117         t = NULL;
118         goto out;
119 }
120 
121 static 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 
145 out:
146         return err;
147 }
148 
149 static 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;
175 out:
176         return err;
177 }
178 
179 static int ipcomp6_rcv_cb(struct sk_buff *skb, int err)
180 {
181         return 0;
182 }
183 
184 static const struct xfrm_type ipcomp6_type = {
185         .description    = "IPCOMP6",
186         .owner          = THIS_MODULE,
187         .proto          = IPPROTO_COMP,
188         .init_state     = ipcomp6_init_state,
189         .destructor     = ipcomp_destroy,
190         .input          = ipcomp_input,
191         .output         = ipcomp_output,
192         .hdr_offset     = xfrm6_find_1stfragopt,
193 };
194 
195 static struct xfrm6_protocol ipcomp6_protocol = {
196         .handler        = xfrm6_rcv,
197         .cb_handler     = ipcomp6_rcv_cb,
198         .err_handler    = ipcomp6_err,
199         .priority       = 0,
200 };
201 
202 static int __init ipcomp6_init(void)
203 {
204         if (xfrm_register_type(&ipcomp6_type, AF_INET6) < 0) {
205                 pr_info("%s: can't add xfrm type\n", __func__);
206                 return -EAGAIN;
207         }
208         if (xfrm6_protocol_register(&ipcomp6_protocol, IPPROTO_COMP) < 0) {
209                 pr_info("%s: can't add protocol\n", __func__);
210                 xfrm_unregister_type(&ipcomp6_type, AF_INET6);
211                 return -EAGAIN;
212         }
213         return 0;
214 }
215 
216 static void __exit ipcomp6_fini(void)
217 {
218         if (xfrm6_protocol_deregister(&ipcomp6_protocol, IPPROTO_COMP) < 0)
219                 pr_info("%s: can't remove protocol\n", __func__);
220         if (xfrm_unregister_type(&ipcomp6_type, AF_INET6) < 0)
221                 pr_info("%s: can't remove xfrm type\n", __func__);
222 }
223 
224 module_init(ipcomp6_init);
225 module_exit(ipcomp6_fini);
226 MODULE_LICENSE("GPL");
227 MODULE_DESCRIPTION("IP Payload Compression Protocol (IPComp) for IPv6 - RFC3173");
228 MODULE_AUTHOR("Mitsuru KANDA <mk@linux-ipv6.org>");
229 
230 MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_COMP);
231 

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