~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/net/ipv6/xfrm6_tunnel.c

Version: ~ [ linux-5.13-rc1 ] ~ [ linux-5.12.2 ] ~ [ linux-5.11.19 ] ~ [ linux-5.10.35 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.117 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.190 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.232 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.268 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.268 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 
 41 struct 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 
 47 static unsigned int xfrm6_tunnel_net_id __read_mostly;
 48 static 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  */
 57 struct 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 
 66 static DEFINE_SPINLOCK(xfrm6_tunnel_spi_lock);
 67 
 68 static struct kmem_cache *xfrm6_tunnel_spi_kmem __read_mostly;
 69 
 70 static 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 
 82 static inline unsigned int xfrm6_tunnel_spi_hash_byspi(u32 spi)
 83 {
 84         return spi % XFRM6_TUNNEL_SPI_BYSPI_HSIZE;
 85 }
 86 
 87 static 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 EXPORT_SYMBOL(xfrm6_tunnel_spi_lookup);
114 
115 static 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 
130 static 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;
155 alloc_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]);
169 out:
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 }
189 EXPORT_SYMBOL(xfrm6_tunnel_alloc_spi);
190 
191 static 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 
197 static 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 
221 static 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 
227 static int xfrm6_tunnel_input(struct xfrm_state *x, struct sk_buff *skb)
228 {
229         return skb_network_header(skb)[IP6CB(skb)->nhoff];
230 }
231 
232 static 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 
242 static 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 
283 static 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 
296 static 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 
303 static 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 
313 static struct xfrm6_tunnel xfrm6_tunnel_handler __read_mostly = {
314         .handler        = xfrm6_tunnel_rcv,
315         .err_handler    = xfrm6_tunnel_err,
316         .priority       = 2,
317 };
318 
319 static struct xfrm6_tunnel xfrm46_tunnel_handler __read_mostly = {
320         .handler        = xfrm6_tunnel_rcv,
321         .err_handler    = xfrm6_tunnel_err,
322         .priority       = 2,
323 };
324 
325 static 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 
339 static 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         for (i = 0; i < XFRM6_TUNNEL_SPI_BYADDR_HSIZE; i++)
345                 WARN_ON_ONCE(!hlist_empty(&xfrm6_tn->spi_byaddr[i]));
346 
347         for (i = 0; i < XFRM6_TUNNEL_SPI_BYSPI_HSIZE; i++)
348                 WARN_ON_ONCE(!hlist_empty(&xfrm6_tn->spi_byspi[i]));
349 }
350 
351 static struct pernet_operations xfrm6_tunnel_net_ops = {
352         .init   = xfrm6_tunnel_net_init,
353         .exit   = xfrm6_tunnel_net_exit,
354         .id     = &xfrm6_tunnel_net_id,
355         .size   = sizeof(struct xfrm6_tunnel_net),
356 };
357 
358 static int __init xfrm6_tunnel_init(void)
359 {
360         int rv;
361 
362         xfrm6_tunnel_spi_kmem = kmem_cache_create("xfrm6_tunnel_spi",
363                                                   sizeof(struct xfrm6_tunnel_spi),
364                                                   0, SLAB_HWCACHE_ALIGN,
365                                                   NULL);
366         if (!xfrm6_tunnel_spi_kmem)
367                 return -ENOMEM;
368         rv = register_pernet_subsys(&xfrm6_tunnel_net_ops);
369         if (rv < 0)
370                 goto out_pernet;
371         rv = xfrm_register_type(&xfrm6_tunnel_type, AF_INET6);
372         if (rv < 0)
373                 goto out_type;
374         rv = xfrm6_tunnel_register(&xfrm6_tunnel_handler, AF_INET6);
375         if (rv < 0)
376                 goto out_xfrm6;
377         rv = xfrm6_tunnel_register(&xfrm46_tunnel_handler, AF_INET);
378         if (rv < 0)
379                 goto out_xfrm46;
380         return 0;
381 
382 out_xfrm46:
383         xfrm6_tunnel_deregister(&xfrm6_tunnel_handler, AF_INET6);
384 out_xfrm6:
385         xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
386 out_type:
387         unregister_pernet_subsys(&xfrm6_tunnel_net_ops);
388 out_pernet:
389         kmem_cache_destroy(xfrm6_tunnel_spi_kmem);
390         return rv;
391 }
392 
393 static void __exit xfrm6_tunnel_fini(void)
394 {
395         xfrm6_tunnel_deregister(&xfrm46_tunnel_handler, AF_INET);
396         xfrm6_tunnel_deregister(&xfrm6_tunnel_handler, AF_INET6);
397         xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
398         unregister_pernet_subsys(&xfrm6_tunnel_net_ops);
399         kmem_cache_destroy(xfrm6_tunnel_spi_kmem);
400 }
401 
402 module_init(xfrm6_tunnel_init);
403 module_exit(xfrm6_tunnel_fini);
404 MODULE_LICENSE("GPL");
405 MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_IPV6);
406 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp