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Linux/net/ipv6/ipcomp6.c

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  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 
 44 static 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 
 74 static 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 
 95         if (xfrm_init_state(t))
 96                 goto error;
 97 
 98         atomic_set(&t->tunnel_users, 1);
 99 
100 out:
101         return t;
102 
103 error:
104         t->km.state = XFRM_STATE_DEAD;
105         xfrm_state_put(t);
106         t = NULL;
107         goto out;
108 }
109 
110 static int ipcomp6_tunnel_attach(struct xfrm_state *x)
111 {
112         struct net *net = xs_net(x);
113         int err = 0;
114         struct xfrm_state *t = NULL;
115         __be32 spi;
116         u32 mark = x->mark.m & x->mark.v;
117 
118         spi = xfrm6_tunnel_spi_lookup(net, (xfrm_address_t *)&x->props.saddr);
119         if (spi)
120                 t = xfrm_state_lookup(net, mark, (xfrm_address_t *)&x->id.daddr,
121                                               spi, IPPROTO_IPV6, AF_INET6);
122         if (!t) {
123                 t = ipcomp6_tunnel_create(x);
124                 if (!t) {
125                         err = -EINVAL;
126                         goto out;
127                 }
128                 xfrm_state_insert(t);
129                 xfrm_state_hold(t);
130         }
131         x->tunnel = t;
132         atomic_inc(&t->tunnel_users);
133 
134 out:
135         return err;
136 }
137 
138 static int ipcomp6_init_state(struct xfrm_state *x)
139 {
140         int err = -EINVAL;
141 
142         x->props.header_len = 0;
143         switch (x->props.mode) {
144         case XFRM_MODE_TRANSPORT:
145                 break;
146         case XFRM_MODE_TUNNEL:
147                 x->props.header_len += sizeof(struct ipv6hdr);
148                 break;
149         default:
150                 goto out;
151         }
152 
153         err = ipcomp_init_state(x);
154         if (err)
155                 goto out;
156 
157         if (x->props.mode == XFRM_MODE_TUNNEL) {
158                 err = ipcomp6_tunnel_attach(x);
159                 if (err)
160                         goto out;
161         }
162 
163         err = 0;
164 out:
165         return err;
166 }
167 
168 static int ipcomp6_rcv_cb(struct sk_buff *skb, int err)
169 {
170         return 0;
171 }
172 
173 static const struct xfrm_type ipcomp6_type = {
174         .description    = "IPCOMP6",
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         .hdr_offset     = xfrm6_find_1stfragopt,
182 };
183 
184 static struct xfrm6_protocol ipcomp6_protocol = {
185         .handler        = xfrm6_rcv,
186         .cb_handler     = ipcomp6_rcv_cb,
187         .err_handler    = ipcomp6_err,
188         .priority       = 0,
189 };
190 
191 static 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 
205 static 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 
212 module_init(ipcomp6_init);
213 module_exit(ipcomp6_fini);
214 MODULE_LICENSE("GPL");
215 MODULE_DESCRIPTION("IP Payload Compression Protocol (IPComp) for IPv6 - RFC3173");
216 MODULE_AUTHOR("Mitsuru KANDA <mk@linux-ipv6.org>");
217 
218 MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_COMP);
219 

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