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1/*
2 * Copyright (C)2003,2004 USAGI/WIDE Project
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, see <http://www.gnu.org/licenses/>.
16 *
17 * Authors Mitsuru KANDA <mk@linux-ipv6.org>
18 * YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
19 *
20 * Based on net/ipv4/xfrm4_tunnel.c
21 *
22 */
23#include <linux/module.h>
24#include <linux/xfrm.h>
25#include <linux/slab.h>
26#include <linux/rculist.h>
27#include <net/ip.h>
28#include <net/xfrm.h>
29#include <net/ipv6.h>
30#include <linux/ipv6.h>
31#include <linux/icmpv6.h>
32#include <linux/mutex.h>
33#include <net/netns/generic.h>
34
35#define XFRM6_TUNNEL_SPI_BYADDR_HSIZE 256
36#define XFRM6_TUNNEL_SPI_BYSPI_HSIZE 256
37
38#define XFRM6_TUNNEL_SPI_MIN 1
39#define XFRM6_TUNNEL_SPI_MAX 0xffffffff
40
41struct xfrm6_tunnel_net {
42 struct hlist_head spi_byaddr[XFRM6_TUNNEL_SPI_BYADDR_HSIZE];
43 struct hlist_head spi_byspi[XFRM6_TUNNEL_SPI_BYSPI_HSIZE];
44 u32 spi;
45};
46
47static int xfrm6_tunnel_net_id __read_mostly;
48static inline struct xfrm6_tunnel_net *xfrm6_tunnel_pernet(struct net *net)
49{
50 return net_generic(net, xfrm6_tunnel_net_id);
51}
52
53/*
54 * xfrm_tunnel_spi things are for allocating unique id ("spi")
55 * per xfrm_address_t.
56 */
57struct xfrm6_tunnel_spi {
58 struct hlist_node list_byaddr;
59 struct hlist_node list_byspi;
60 xfrm_address_t addr;
61 u32 spi;
62 atomic_t refcnt;
63 struct rcu_head rcu_head;
64};
65
66static DEFINE_SPINLOCK(xfrm6_tunnel_spi_lock);
67
68static struct kmem_cache *xfrm6_tunnel_spi_kmem __read_mostly;
69
70static inline unsigned int xfrm6_tunnel_spi_hash_byaddr(const xfrm_address_t *addr)
71{
72 unsigned int h;
73
74 h = ipv6_addr_hash((const struct in6_addr *)addr);
75 h ^= h >> 16;
76 h ^= h >> 8;
77 h &= XFRM6_TUNNEL_SPI_BYADDR_HSIZE - 1;
78
79 return h;
80}
81
82static inline unsigned int xfrm6_tunnel_spi_hash_byspi(u32 spi)
83{
84 return spi % XFRM6_TUNNEL_SPI_BYSPI_HSIZE;
85}
86
87static struct xfrm6_tunnel_spi *__xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr)
88{
89 struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
90 struct xfrm6_tunnel_spi *x6spi;
91
92 hlist_for_each_entry_rcu(x6spi,
93 &xfrm6_tn->spi_byaddr[xfrm6_tunnel_spi_hash_byaddr(saddr)],
94 list_byaddr) {
95 if (xfrm6_addr_equal(&x6spi->addr, saddr))
96 return x6spi;
97 }
98
99 return NULL;
100}
101
102__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr)
103{
104 struct xfrm6_tunnel_spi *x6spi;
105 u32 spi;
106
107 rcu_read_lock_bh();
108 x6spi = __xfrm6_tunnel_spi_lookup(net, saddr);
109 spi = x6spi ? x6spi->spi : 0;
110 rcu_read_unlock_bh();
111 return htonl(spi);
112}
113
114EXPORT_SYMBOL(xfrm6_tunnel_spi_lookup);
115
116static int __xfrm6_tunnel_spi_check(struct net *net, u32 spi)
117{
118 struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
119 struct xfrm6_tunnel_spi *x6spi;
120 int index = xfrm6_tunnel_spi_hash_byspi(spi);
121
122 hlist_for_each_entry(x6spi,
123 &xfrm6_tn->spi_byspi[index],
124 list_byspi) {
125 if (x6spi->spi == spi)
126 return -1;
127 }
128 return index;
129}
130
131static u32 __xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr)
132{
133 struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
134 u32 spi;
135 struct xfrm6_tunnel_spi *x6spi;
136 int index;
137
138 if (xfrm6_tn->spi < XFRM6_TUNNEL_SPI_MIN ||
139 xfrm6_tn->spi >= XFRM6_TUNNEL_SPI_MAX)
140 xfrm6_tn->spi = XFRM6_TUNNEL_SPI_MIN;
141 else
142 xfrm6_tn->spi++;
143
144 for (spi = xfrm6_tn->spi; spi <= XFRM6_TUNNEL_SPI_MAX; spi++) {
145 index = __xfrm6_tunnel_spi_check(net, spi);
146 if (index >= 0)
147 goto alloc_spi;
148 }
149 for (spi = XFRM6_TUNNEL_SPI_MIN; spi < xfrm6_tn->spi; spi++) {
150 index = __xfrm6_tunnel_spi_check(net, spi);
151 if (index >= 0)
152 goto alloc_spi;
153 }
154 spi = 0;
155 goto out;
156alloc_spi:
157 xfrm6_tn->spi = spi;
158 x6spi = kmem_cache_alloc(xfrm6_tunnel_spi_kmem, GFP_ATOMIC);
159 if (!x6spi)
160 goto out;
161
162 memcpy(&x6spi->addr, saddr, sizeof(x6spi->addr));
163 x6spi->spi = spi;
164 atomic_set(&x6spi->refcnt, 1);
165
166 hlist_add_head_rcu(&x6spi->list_byspi, &xfrm6_tn->spi_byspi[index]);
167
168 index = xfrm6_tunnel_spi_hash_byaddr(saddr);
169 hlist_add_head_rcu(&x6spi->list_byaddr, &xfrm6_tn->spi_byaddr[index]);
170out:
171 return spi;
172}
173
174__be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr)
175{
176 struct xfrm6_tunnel_spi *x6spi;
177 u32 spi;
178
179 spin_lock_bh(&xfrm6_tunnel_spi_lock);
180 x6spi = __xfrm6_tunnel_spi_lookup(net, saddr);
181 if (x6spi) {
182 atomic_inc(&x6spi->refcnt);
183 spi = x6spi->spi;
184 } else
185 spi = __xfrm6_tunnel_alloc_spi(net, saddr);
186 spin_unlock_bh(&xfrm6_tunnel_spi_lock);
187
188 return htonl(spi);
189}
190
191EXPORT_SYMBOL(xfrm6_tunnel_alloc_spi);
192
193static void x6spi_destroy_rcu(struct rcu_head *head)
194{
195 kmem_cache_free(xfrm6_tunnel_spi_kmem,
196 container_of(head, struct xfrm6_tunnel_spi, rcu_head));
197}
198
199static void xfrm6_tunnel_free_spi(struct net *net, xfrm_address_t *saddr)
200{
201 struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
202 struct xfrm6_tunnel_spi *x6spi;
203 struct hlist_node *n;
204
205 spin_lock_bh(&xfrm6_tunnel_spi_lock);
206
207 hlist_for_each_entry_safe(x6spi, n,
208 &xfrm6_tn->spi_byaddr[xfrm6_tunnel_spi_hash_byaddr(saddr)],
209 list_byaddr)
210 {
211 if (xfrm6_addr_equal(&x6spi->addr, saddr)) {
212 if (atomic_dec_and_test(&x6spi->refcnt)) {
213 hlist_del_rcu(&x6spi->list_byaddr);
214 hlist_del_rcu(&x6spi->list_byspi);
215 call_rcu(&x6spi->rcu_head, x6spi_destroy_rcu);
216 break;
217 }
218 }
219 }
220 spin_unlock_bh(&xfrm6_tunnel_spi_lock);
221}
222
223static int xfrm6_tunnel_output(struct xfrm_state *x, struct sk_buff *skb)
224{
225 skb_push(skb, -skb_network_offset(skb));
226 return 0;
227}
228
229static int xfrm6_tunnel_input(struct xfrm_state *x, struct sk_buff *skb)
230{
231 return skb_network_header(skb)[IP6CB(skb)->nhoff];
232}
233
234static int xfrm6_tunnel_rcv(struct sk_buff *skb)
235{
236 struct net *net = dev_net(skb->dev);
237 const struct ipv6hdr *iph = ipv6_hdr(skb);
238 __be32 spi;
239
240 spi = xfrm6_tunnel_spi_lookup(net, (const xfrm_address_t *)&iph->saddr);
241 return xfrm6_rcv_spi(skb, IPPROTO_IPV6, spi);
242}
243
244static int xfrm6_tunnel_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
245 u8 type, u8 code, int offset, __be32 info)
246{
247 /* xfrm6_tunnel native err handling */
248 switch (type) {
249 case ICMPV6_DEST_UNREACH:
250 switch (code) {
251 case ICMPV6_NOROUTE:
252 case ICMPV6_ADM_PROHIBITED:
253 case ICMPV6_NOT_NEIGHBOUR:
254 case ICMPV6_ADDR_UNREACH:
255 case ICMPV6_PORT_UNREACH:
256 default:
257 break;
258 }
259 break;
260 case ICMPV6_PKT_TOOBIG:
261 break;
262 case ICMPV6_TIME_EXCEED:
263 switch (code) {
264 case ICMPV6_EXC_HOPLIMIT:
265 break;
266 case ICMPV6_EXC_FRAGTIME:
267 default:
268 break;
269 }
270 break;
271 case ICMPV6_PARAMPROB:
272 switch (code) {
273 case ICMPV6_HDR_FIELD: break;
274 case ICMPV6_UNK_NEXTHDR: break;
275 case ICMPV6_UNK_OPTION: break;
276 }
277 break;
278 default:
279 break;
280 }
281
282 return 0;
283}
284
285static int xfrm6_tunnel_init_state(struct xfrm_state *x)
286{
287 if (x->props.mode != XFRM_MODE_TUNNEL)
288 return -EINVAL;
289
290 if (x->encap)
291 return -EINVAL;
292
293 x->props.header_len = sizeof(struct ipv6hdr);
294
295 return 0;
296}
297
298static void xfrm6_tunnel_destroy(struct xfrm_state *x)
299{
300 struct net *net = xs_net(x);
301
302 xfrm6_tunnel_free_spi(net, (xfrm_address_t *)&x->props.saddr);
303}
304
305static const struct xfrm_type xfrm6_tunnel_type = {
306 .description = "IP6IP6",
307 .owner = THIS_MODULE,
308 .proto = IPPROTO_IPV6,
309 .init_state = xfrm6_tunnel_init_state,
310 .destructor = xfrm6_tunnel_destroy,
311 .input = xfrm6_tunnel_input,
312 .output = xfrm6_tunnel_output,
313};
314
315static struct xfrm6_tunnel xfrm6_tunnel_handler __read_mostly = {
316 .handler = xfrm6_tunnel_rcv,
317 .err_handler = xfrm6_tunnel_err,
318 .priority = 2,
319};
320
321static struct xfrm6_tunnel xfrm46_tunnel_handler __read_mostly = {
322 .handler = xfrm6_tunnel_rcv,
323 .err_handler = xfrm6_tunnel_err,
324 .priority = 2,
325};
326
327static int __net_init xfrm6_tunnel_net_init(struct net *net)
328{
329 struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
330 unsigned int i;
331
332 for (i = 0; i < XFRM6_TUNNEL_SPI_BYADDR_HSIZE; i++)
333 INIT_HLIST_HEAD(&xfrm6_tn->spi_byaddr[i]);
334 for (i = 0; i < XFRM6_TUNNEL_SPI_BYSPI_HSIZE; i++)
335 INIT_HLIST_HEAD(&xfrm6_tn->spi_byspi[i]);
336 xfrm6_tn->spi = 0;
337
338 return 0;
339}
340
341static void __net_exit xfrm6_tunnel_net_exit(struct net *net)
342{
343}
344
345static struct pernet_operations xfrm6_tunnel_net_ops = {
346 .init = xfrm6_tunnel_net_init,
347 .exit = xfrm6_tunnel_net_exit,
348 .id = &xfrm6_tunnel_net_id,
349 .size = sizeof(struct xfrm6_tunnel_net),
350};
351
352static int __init xfrm6_tunnel_init(void)
353{
354 int rv;
355
356 xfrm6_tunnel_spi_kmem = kmem_cache_create("xfrm6_tunnel_spi",
357 sizeof(struct xfrm6_tunnel_spi),
358 0, SLAB_HWCACHE_ALIGN,
359 NULL);
360 if (!xfrm6_tunnel_spi_kmem)
361 return -ENOMEM;
362 rv = register_pernet_subsys(&xfrm6_tunnel_net_ops);
363 if (rv < 0)
364 goto out_pernet;
365 rv = xfrm_register_type(&xfrm6_tunnel_type, AF_INET6);
366 if (rv < 0)
367 goto out_type;
368 rv = xfrm6_tunnel_register(&xfrm6_tunnel_handler, AF_INET6);
369 if (rv < 0)
370 goto out_xfrm6;
371 rv = xfrm6_tunnel_register(&xfrm46_tunnel_handler, AF_INET);
372 if (rv < 0)
373 goto out_xfrm46;
374 return 0;
375
376out_xfrm46:
377 xfrm6_tunnel_deregister(&xfrm6_tunnel_handler, AF_INET6);
378out_xfrm6:
379 xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
380out_type:
381 unregister_pernet_subsys(&xfrm6_tunnel_net_ops);
382out_pernet:
383 kmem_cache_destroy(xfrm6_tunnel_spi_kmem);
384 return rv;
385}
386
387static void __exit xfrm6_tunnel_fini(void)
388{
389 xfrm6_tunnel_deregister(&xfrm46_tunnel_handler, AF_INET);
390 xfrm6_tunnel_deregister(&xfrm6_tunnel_handler, AF_INET6);
391 xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
392 unregister_pernet_subsys(&xfrm6_tunnel_net_ops);
393 kmem_cache_destroy(xfrm6_tunnel_spi_kmem);
394}
395
396module_init(xfrm6_tunnel_init);
397module_exit(xfrm6_tunnel_fini);
398MODULE_LICENSE("GPL");
399MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_IPV6);
1/*
2 * Copyright (C)2003,2004 USAGI/WIDE Project
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, see <http://www.gnu.org/licenses/>.
16 *
17 * Authors Mitsuru KANDA <mk@linux-ipv6.org>
18 * YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
19 *
20 * Based on net/ipv4/xfrm4_tunnel.c
21 *
22 */
23#include <linux/module.h>
24#include <linux/xfrm.h>
25#include <linux/slab.h>
26#include <linux/rculist.h>
27#include <net/ip.h>
28#include <net/xfrm.h>
29#include <net/ipv6.h>
30#include <linux/ipv6.h>
31#include <linux/icmpv6.h>
32#include <linux/mutex.h>
33#include <net/netns/generic.h>
34
35#define XFRM6_TUNNEL_SPI_BYADDR_HSIZE 256
36#define XFRM6_TUNNEL_SPI_BYSPI_HSIZE 256
37
38#define XFRM6_TUNNEL_SPI_MIN 1
39#define XFRM6_TUNNEL_SPI_MAX 0xffffffff
40
41struct xfrm6_tunnel_net {
42 struct hlist_head spi_byaddr[XFRM6_TUNNEL_SPI_BYADDR_HSIZE];
43 struct hlist_head spi_byspi[XFRM6_TUNNEL_SPI_BYSPI_HSIZE];
44 u32 spi;
45};
46
47static unsigned int xfrm6_tunnel_net_id __read_mostly;
48static inline struct xfrm6_tunnel_net *xfrm6_tunnel_pernet(struct net *net)
49{
50 return net_generic(net, xfrm6_tunnel_net_id);
51}
52
53/*
54 * xfrm_tunnel_spi things are for allocating unique id ("spi")
55 * per xfrm_address_t.
56 */
57struct xfrm6_tunnel_spi {
58 struct hlist_node list_byaddr;
59 struct hlist_node list_byspi;
60 xfrm_address_t addr;
61 u32 spi;
62 refcount_t refcnt;
63 struct rcu_head rcu_head;
64};
65
66static DEFINE_SPINLOCK(xfrm6_tunnel_spi_lock);
67
68static struct kmem_cache *xfrm6_tunnel_spi_kmem __read_mostly;
69
70static inline unsigned int xfrm6_tunnel_spi_hash_byaddr(const xfrm_address_t *addr)
71{
72 unsigned int h;
73
74 h = ipv6_addr_hash((const struct in6_addr *)addr);
75 h ^= h >> 16;
76 h ^= h >> 8;
77 h &= XFRM6_TUNNEL_SPI_BYADDR_HSIZE - 1;
78
79 return h;
80}
81
82static inline unsigned int xfrm6_tunnel_spi_hash_byspi(u32 spi)
83{
84 return spi % XFRM6_TUNNEL_SPI_BYSPI_HSIZE;
85}
86
87static struct xfrm6_tunnel_spi *__xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr)
88{
89 struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
90 struct xfrm6_tunnel_spi *x6spi;
91
92 hlist_for_each_entry_rcu(x6spi,
93 &xfrm6_tn->spi_byaddr[xfrm6_tunnel_spi_hash_byaddr(saddr)],
94 list_byaddr) {
95 if (xfrm6_addr_equal(&x6spi->addr, saddr))
96 return x6spi;
97 }
98
99 return NULL;
100}
101
102__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr)
103{
104 struct xfrm6_tunnel_spi *x6spi;
105 u32 spi;
106
107 rcu_read_lock_bh();
108 x6spi = __xfrm6_tunnel_spi_lookup(net, saddr);
109 spi = x6spi ? x6spi->spi : 0;
110 rcu_read_unlock_bh();
111 return htonl(spi);
112}
113EXPORT_SYMBOL(xfrm6_tunnel_spi_lookup);
114
115static int __xfrm6_tunnel_spi_check(struct net *net, u32 spi)
116{
117 struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
118 struct xfrm6_tunnel_spi *x6spi;
119 int index = xfrm6_tunnel_spi_hash_byspi(spi);
120
121 hlist_for_each_entry(x6spi,
122 &xfrm6_tn->spi_byspi[index],
123 list_byspi) {
124 if (x6spi->spi == spi)
125 return -1;
126 }
127 return index;
128}
129
130static u32 __xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr)
131{
132 struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
133 u32 spi;
134 struct xfrm6_tunnel_spi *x6spi;
135 int index;
136
137 if (xfrm6_tn->spi < XFRM6_TUNNEL_SPI_MIN ||
138 xfrm6_tn->spi >= XFRM6_TUNNEL_SPI_MAX)
139 xfrm6_tn->spi = XFRM6_TUNNEL_SPI_MIN;
140 else
141 xfrm6_tn->spi++;
142
143 for (spi = xfrm6_tn->spi; spi <= XFRM6_TUNNEL_SPI_MAX; spi++) {
144 index = __xfrm6_tunnel_spi_check(net, spi);
145 if (index >= 0)
146 goto alloc_spi;
147 }
148 for (spi = XFRM6_TUNNEL_SPI_MIN; spi < xfrm6_tn->spi; spi++) {
149 index = __xfrm6_tunnel_spi_check(net, spi);
150 if (index >= 0)
151 goto alloc_spi;
152 }
153 spi = 0;
154 goto out;
155alloc_spi:
156 xfrm6_tn->spi = spi;
157 x6spi = kmem_cache_alloc(xfrm6_tunnel_spi_kmem, GFP_ATOMIC);
158 if (!x6spi)
159 goto out;
160
161 memcpy(&x6spi->addr, saddr, sizeof(x6spi->addr));
162 x6spi->spi = spi;
163 refcount_set(&x6spi->refcnt, 1);
164
165 hlist_add_head_rcu(&x6spi->list_byspi, &xfrm6_tn->spi_byspi[index]);
166
167 index = xfrm6_tunnel_spi_hash_byaddr(saddr);
168 hlist_add_head_rcu(&x6spi->list_byaddr, &xfrm6_tn->spi_byaddr[index]);
169out:
170 return spi;
171}
172
173__be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr)
174{
175 struct xfrm6_tunnel_spi *x6spi;
176 u32 spi;
177
178 spin_lock_bh(&xfrm6_tunnel_spi_lock);
179 x6spi = __xfrm6_tunnel_spi_lookup(net, saddr);
180 if (x6spi) {
181 refcount_inc(&x6spi->refcnt);
182 spi = x6spi->spi;
183 } else
184 spi = __xfrm6_tunnel_alloc_spi(net, saddr);
185 spin_unlock_bh(&xfrm6_tunnel_spi_lock);
186
187 return htonl(spi);
188}
189EXPORT_SYMBOL(xfrm6_tunnel_alloc_spi);
190
191static void x6spi_destroy_rcu(struct rcu_head *head)
192{
193 kmem_cache_free(xfrm6_tunnel_spi_kmem,
194 container_of(head, struct xfrm6_tunnel_spi, rcu_head));
195}
196
197static void xfrm6_tunnel_free_spi(struct net *net, xfrm_address_t *saddr)
198{
199 struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
200 struct xfrm6_tunnel_spi *x6spi;
201 struct hlist_node *n;
202
203 spin_lock_bh(&xfrm6_tunnel_spi_lock);
204
205 hlist_for_each_entry_safe(x6spi, n,
206 &xfrm6_tn->spi_byaddr[xfrm6_tunnel_spi_hash_byaddr(saddr)],
207 list_byaddr)
208 {
209 if (xfrm6_addr_equal(&x6spi->addr, saddr)) {
210 if (refcount_dec_and_test(&x6spi->refcnt)) {
211 hlist_del_rcu(&x6spi->list_byaddr);
212 hlist_del_rcu(&x6spi->list_byspi);
213 call_rcu(&x6spi->rcu_head, x6spi_destroy_rcu);
214 break;
215 }
216 }
217 }
218 spin_unlock_bh(&xfrm6_tunnel_spi_lock);
219}
220
221static int xfrm6_tunnel_output(struct xfrm_state *x, struct sk_buff *skb)
222{
223 skb_push(skb, -skb_network_offset(skb));
224 return 0;
225}
226
227static int xfrm6_tunnel_input(struct xfrm_state *x, struct sk_buff *skb)
228{
229 return skb_network_header(skb)[IP6CB(skb)->nhoff];
230}
231
232static int xfrm6_tunnel_rcv(struct sk_buff *skb)
233{
234 struct net *net = dev_net(skb->dev);
235 const struct ipv6hdr *iph = ipv6_hdr(skb);
236 __be32 spi;
237
238 spi = xfrm6_tunnel_spi_lookup(net, (const xfrm_address_t *)&iph->saddr);
239 return xfrm6_rcv_spi(skb, IPPROTO_IPV6, spi, NULL);
240}
241
242static int xfrm6_tunnel_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
243 u8 type, u8 code, int offset, __be32 info)
244{
245 /* xfrm6_tunnel native err handling */
246 switch (type) {
247 case ICMPV6_DEST_UNREACH:
248 switch (code) {
249 case ICMPV6_NOROUTE:
250 case ICMPV6_ADM_PROHIBITED:
251 case ICMPV6_NOT_NEIGHBOUR:
252 case ICMPV6_ADDR_UNREACH:
253 case ICMPV6_PORT_UNREACH:
254 default:
255 break;
256 }
257 break;
258 case ICMPV6_PKT_TOOBIG:
259 break;
260 case ICMPV6_TIME_EXCEED:
261 switch (code) {
262 case ICMPV6_EXC_HOPLIMIT:
263 break;
264 case ICMPV6_EXC_FRAGTIME:
265 default:
266 break;
267 }
268 break;
269 case ICMPV6_PARAMPROB:
270 switch (code) {
271 case ICMPV6_HDR_FIELD: break;
272 case ICMPV6_UNK_NEXTHDR: break;
273 case ICMPV6_UNK_OPTION: break;
274 }
275 break;
276 default:
277 break;
278 }
279
280 return 0;
281}
282
283static int xfrm6_tunnel_init_state(struct xfrm_state *x)
284{
285 if (x->props.mode != XFRM_MODE_TUNNEL)
286 return -EINVAL;
287
288 if (x->encap)
289 return -EINVAL;
290
291 x->props.header_len = sizeof(struct ipv6hdr);
292
293 return 0;
294}
295
296static void xfrm6_tunnel_destroy(struct xfrm_state *x)
297{
298 struct net *net = xs_net(x);
299
300 xfrm6_tunnel_free_spi(net, (xfrm_address_t *)&x->props.saddr);
301}
302
303static const struct xfrm_type xfrm6_tunnel_type = {
304 .description = "IP6IP6",
305 .owner = THIS_MODULE,
306 .proto = IPPROTO_IPV6,
307 .init_state = xfrm6_tunnel_init_state,
308 .destructor = xfrm6_tunnel_destroy,
309 .input = xfrm6_tunnel_input,
310 .output = xfrm6_tunnel_output,
311};
312
313static struct xfrm6_tunnel xfrm6_tunnel_handler __read_mostly = {
314 .handler = xfrm6_tunnel_rcv,
315 .err_handler = xfrm6_tunnel_err,
316 .priority = 2,
317};
318
319static struct xfrm6_tunnel xfrm46_tunnel_handler __read_mostly = {
320 .handler = xfrm6_tunnel_rcv,
321 .err_handler = xfrm6_tunnel_err,
322 .priority = 2,
323};
324
325static int __net_init xfrm6_tunnel_net_init(struct net *net)
326{
327 struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
328 unsigned int i;
329
330 for (i = 0; i < XFRM6_TUNNEL_SPI_BYADDR_HSIZE; i++)
331 INIT_HLIST_HEAD(&xfrm6_tn->spi_byaddr[i]);
332 for (i = 0; i < XFRM6_TUNNEL_SPI_BYSPI_HSIZE; i++)
333 INIT_HLIST_HEAD(&xfrm6_tn->spi_byspi[i]);
334 xfrm6_tn->spi = 0;
335
336 return 0;
337}
338
339static void __net_exit xfrm6_tunnel_net_exit(struct net *net)
340{
341 struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
342 unsigned int i;
343
344 xfrm_state_flush(net, IPSEC_PROTO_ANY, false);
345 xfrm_flush_gc();
346
347 for (i = 0; i < XFRM6_TUNNEL_SPI_BYADDR_HSIZE; i++)
348 WARN_ON_ONCE(!hlist_empty(&xfrm6_tn->spi_byaddr[i]));
349
350 for (i = 0; i < XFRM6_TUNNEL_SPI_BYSPI_HSIZE; i++)
351 WARN_ON_ONCE(!hlist_empty(&xfrm6_tn->spi_byspi[i]));
352}
353
354static struct pernet_operations xfrm6_tunnel_net_ops = {
355 .init = xfrm6_tunnel_net_init,
356 .exit = xfrm6_tunnel_net_exit,
357 .id = &xfrm6_tunnel_net_id,
358 .size = sizeof(struct xfrm6_tunnel_net),
359};
360
361static int __init xfrm6_tunnel_init(void)
362{
363 int rv;
364
365 xfrm6_tunnel_spi_kmem = kmem_cache_create("xfrm6_tunnel_spi",
366 sizeof(struct xfrm6_tunnel_spi),
367 0, SLAB_HWCACHE_ALIGN,
368 NULL);
369 if (!xfrm6_tunnel_spi_kmem)
370 return -ENOMEM;
371 rv = register_pernet_subsys(&xfrm6_tunnel_net_ops);
372 if (rv < 0)
373 goto out_pernet;
374 rv = xfrm_register_type(&xfrm6_tunnel_type, AF_INET6);
375 if (rv < 0)
376 goto out_type;
377 rv = xfrm6_tunnel_register(&xfrm6_tunnel_handler, AF_INET6);
378 if (rv < 0)
379 goto out_xfrm6;
380 rv = xfrm6_tunnel_register(&xfrm46_tunnel_handler, AF_INET);
381 if (rv < 0)
382 goto out_xfrm46;
383 return 0;
384
385out_xfrm46:
386 xfrm6_tunnel_deregister(&xfrm6_tunnel_handler, AF_INET6);
387out_xfrm6:
388 xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
389out_type:
390 unregister_pernet_subsys(&xfrm6_tunnel_net_ops);
391out_pernet:
392 kmem_cache_destroy(xfrm6_tunnel_spi_kmem);
393 return rv;
394}
395
396static void __exit xfrm6_tunnel_fini(void)
397{
398 xfrm6_tunnel_deregister(&xfrm46_tunnel_handler, AF_INET);
399 xfrm6_tunnel_deregister(&xfrm6_tunnel_handler, AF_INET6);
400 xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
401 unregister_pernet_subsys(&xfrm6_tunnel_net_ops);
402 kmem_cache_destroy(xfrm6_tunnel_spi_kmem);
403}
404
405module_init(xfrm6_tunnel_init);
406module_exit(xfrm6_tunnel_fini);
407MODULE_LICENSE("GPL");
408MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_IPV6);