Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
c4d3efaf | 2 | * IPv6 tunneling device |
1da177e4 LT |
3 | * Linux INET6 implementation |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Ville Nuorvala <vnuorval@tcs.hut.fi> |
c4d3efaf | 7 | * Yasuyuki Kozakai <kozakai@linux-ipv6.org> |
1da177e4 | 8 | * |
1da177e4 | 9 | * Based on: |
c4d3efaf | 10 | * linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c |
1da177e4 LT |
11 | * |
12 | * RFC 2473 | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU General Public License | |
16 | * as published by the Free Software Foundation; either version | |
17 | * 2 of the License, or (at your option) any later version. | |
18 | * | |
19 | */ | |
20 | ||
f3213831 JP |
21 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
22 | ||
1da177e4 | 23 | #include <linux/module.h> |
4fc268d2 | 24 | #include <linux/capability.h> |
1da177e4 LT |
25 | #include <linux/errno.h> |
26 | #include <linux/types.h> | |
27 | #include <linux/sockios.h> | |
c4d3efaf | 28 | #include <linux/icmp.h> |
1da177e4 LT |
29 | #include <linux/if.h> |
30 | #include <linux/in.h> | |
31 | #include <linux/ip.h> | |
1da177e4 LT |
32 | #include <linux/net.h> |
33 | #include <linux/in6.h> | |
34 | #include <linux/netdevice.h> | |
35 | #include <linux/if_arp.h> | |
36 | #include <linux/icmpv6.h> | |
37 | #include <linux/init.h> | |
38 | #include <linux/route.h> | |
39 | #include <linux/rtnetlink.h> | |
40 | #include <linux/netfilter_ipv6.h> | |
5a0e3ad6 | 41 | #include <linux/slab.h> |
ddbe5032 | 42 | #include <linux/hash.h> |
e837735e | 43 | #include <linux/etherdevice.h> |
1da177e4 LT |
44 | |
45 | #include <asm/uaccess.h> | |
60063497 | 46 | #include <linux/atomic.h> |
1da177e4 | 47 | |
c4d3efaf | 48 | #include <net/icmp.h> |
1da177e4 | 49 | #include <net/ip.h> |
c5441932 | 50 | #include <net/ip_tunnels.h> |
1da177e4 | 51 | #include <net/ipv6.h> |
1da177e4 LT |
52 | #include <net/ip6_route.h> |
53 | #include <net/addrconf.h> | |
54 | #include <net/ip6_tunnel.h> | |
55 | #include <net/xfrm.h> | |
56 | #include <net/dsfield.h> | |
57 | #include <net/inet_ecn.h> | |
13eeb8e9 PE |
58 | #include <net/net_namespace.h> |
59 | #include <net/netns/generic.h> | |
1da177e4 LT |
60 | |
61 | MODULE_AUTHOR("Ville Nuorvala"); | |
c4d3efaf | 62 | MODULE_DESCRIPTION("IPv6 tunneling device"); |
1da177e4 | 63 | MODULE_LICENSE("GPL"); |
f98f89a0 | 64 | MODULE_ALIAS_RTNL_LINK("ip6tnl"); |
6dfbd87a | 65 | MODULE_ALIAS_NETDEV("ip6tnl0"); |
1da177e4 | 66 | |
ddbe5032 ED |
67 | #define HASH_SIZE_SHIFT 5 |
68 | #define HASH_SIZE (1 << HASH_SIZE_SHIFT) | |
1da177e4 | 69 | |
f4e0b4c5 ND |
70 | static bool log_ecn_error = true; |
71 | module_param(log_ecn_error, bool, 0644); | |
72 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); | |
73 | ||
ddbe5032 ED |
74 | static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2) |
75 | { | |
76 | u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2); | |
77 | ||
78 | return hash_32(hash, HASH_SIZE_SHIFT); | |
79 | } | |
1da177e4 | 80 | |
8560f226 | 81 | static int ip6_tnl_dev_init(struct net_device *dev); |
3144581c | 82 | static void ip6_tnl_dev_setup(struct net_device *dev); |
c075b130 | 83 | static struct rtnl_link_ops ip6_link_ops __read_mostly; |
1da177e4 | 84 | |
f99189b1 | 85 | static int ip6_tnl_net_id __read_mostly; |
13eeb8e9 | 86 | struct ip6_tnl_net { |
15820e12 PE |
87 | /* the IPv6 tunnel fallback device */ |
88 | struct net_device *fb_tnl_dev; | |
3e6c9fb5 | 89 | /* lists for storing tunnels in use */ |
94767632 ED |
90 | struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE]; |
91 | struct ip6_tnl __rcu *tnls_wc[1]; | |
92 | struct ip6_tnl __rcu **tnls[2]; | |
13eeb8e9 PE |
93 | }; |
94 | ||
8560f226 ED |
95 | static struct net_device_stats *ip6_get_stats(struct net_device *dev) |
96 | { | |
56a4342d | 97 | struct pcpu_sw_netstats tmp, sum = { 0 }; |
8560f226 ED |
98 | int i; |
99 | ||
100 | for_each_possible_cpu(i) { | |
abb6013c | 101 | unsigned int start; |
8f84985f LR |
102 | const struct pcpu_sw_netstats *tstats = |
103 | per_cpu_ptr(dev->tstats, i); | |
8560f226 | 104 | |
abb6013c | 105 | do { |
57a7744e | 106 | start = u64_stats_fetch_begin_irq(&tstats->syncp); |
abb6013c LR |
107 | tmp.rx_packets = tstats->rx_packets; |
108 | tmp.rx_bytes = tstats->rx_bytes; | |
109 | tmp.tx_packets = tstats->tx_packets; | |
110 | tmp.tx_bytes = tstats->tx_bytes; | |
57a7744e | 111 | } while (u64_stats_fetch_retry_irq(&tstats->syncp, start)); |
abb6013c LR |
112 | |
113 | sum.rx_packets += tmp.rx_packets; | |
114 | sum.rx_bytes += tmp.rx_bytes; | |
115 | sum.tx_packets += tmp.tx_packets; | |
116 | sum.tx_bytes += tmp.tx_bytes; | |
8560f226 ED |
117 | } |
118 | dev->stats.rx_packets = sum.rx_packets; | |
119 | dev->stats.rx_bytes = sum.rx_bytes; | |
120 | dev->stats.tx_packets = sum.tx_packets; | |
121 | dev->stats.tx_bytes = sum.tx_bytes; | |
122 | return &dev->stats; | |
123 | } | |
124 | ||
2922bc8a | 125 | /* |
94767632 | 126 | * Locking : hash tables are protected by RCU and RTNL |
2922bc8a | 127 | */ |
1da177e4 | 128 | |
70da5b5c MKL |
129 | static void ip6_tnl_per_cpu_dst_set(struct ip6_tnl_dst *idst, |
130 | struct dst_entry *dst) | |
1da177e4 | 131 | { |
70da5b5c MKL |
132 | write_seqlock_bh(&idst->lock); |
133 | dst_release(rcu_dereference_protected( | |
134 | idst->dst, | |
135 | lockdep_is_held(&idst->lock.lock))); | |
cdf3464e MKL |
136 | if (dst) { |
137 | dst_hold(dst); | |
138 | idst->cookie = rt6_get_cookie((struct rt6_info *)dst); | |
139 | } else { | |
140 | idst->cookie = 0; | |
1da177e4 | 141 | } |
70da5b5c MKL |
142 | rcu_assign_pointer(idst->dst, dst); |
143 | write_sequnlock_bh(&idst->lock); | |
cdf3464e MKL |
144 | } |
145 | ||
146 | struct dst_entry *ip6_tnl_dst_get(struct ip6_tnl *t) | |
147 | { | |
148 | struct ip6_tnl_dst *idst; | |
149 | struct dst_entry *dst; | |
70da5b5c MKL |
150 | unsigned int seq; |
151 | u32 cookie; | |
cdf3464e MKL |
152 | |
153 | idst = raw_cpu_ptr(t->dst_cache); | |
70da5b5c MKL |
154 | |
155 | rcu_read_lock(); | |
156 | do { | |
157 | seq = read_seqbegin(&idst->lock); | |
158 | dst = rcu_dereference(idst->dst); | |
159 | cookie = idst->cookie; | |
160 | } while (read_seqretry(&idst->lock, seq)); | |
161 | ||
162 | if (dst && !atomic_inc_not_zero(&dst->__refcnt)) | |
163 | dst = NULL; | |
164 | rcu_read_unlock(); | |
165 | ||
166 | if (dst && dst->obsolete && !dst->ops->check(dst, cookie)) { | |
167 | ip6_tnl_per_cpu_dst_set(idst, NULL); | |
168 | dst_release(dst); | |
169 | dst = NULL; | |
cdf3464e | 170 | } |
1da177e4 LT |
171 | return dst; |
172 | } | |
f230d1e8 | 173 | EXPORT_SYMBOL_GPL(ip6_tnl_dst_get); |
1da177e4 | 174 | |
c12b395a | 175 | void ip6_tnl_dst_reset(struct ip6_tnl *t) |
1da177e4 | 176 | { |
cdf3464e MKL |
177 | int i; |
178 | ||
179 | for_each_possible_cpu(i) | |
206b4950 | 180 | ip6_tnl_per_cpu_dst_set(per_cpu_ptr(t->dst_cache, i), NULL); |
1da177e4 | 181 | } |
c12b395a | 182 | EXPORT_SYMBOL_GPL(ip6_tnl_dst_reset); |
1da177e4 | 183 | |
f230d1e8 | 184 | void ip6_tnl_dst_set(struct ip6_tnl *t, struct dst_entry *dst) |
1da177e4 | 185 | { |
cdf3464e MKL |
186 | ip6_tnl_per_cpu_dst_set(raw_cpu_ptr(t->dst_cache), dst); |
187 | ||
1da177e4 | 188 | } |
f230d1e8 | 189 | EXPORT_SYMBOL_GPL(ip6_tnl_dst_set); |
1da177e4 | 190 | |
cdf3464e MKL |
191 | void ip6_tnl_dst_destroy(struct ip6_tnl *t) |
192 | { | |
193 | if (!t->dst_cache) | |
194 | return; | |
195 | ||
196 | ip6_tnl_dst_reset(t); | |
197 | free_percpu(t->dst_cache); | |
198 | } | |
199 | EXPORT_SYMBOL_GPL(ip6_tnl_dst_destroy); | |
200 | ||
201 | int ip6_tnl_dst_init(struct ip6_tnl *t) | |
202 | { | |
203 | int i; | |
204 | ||
205 | t->dst_cache = alloc_percpu(struct ip6_tnl_dst); | |
206 | if (!t->dst_cache) | |
207 | return -ENOMEM; | |
208 | ||
209 | for_each_possible_cpu(i) | |
70da5b5c | 210 | seqlock_init(&per_cpu_ptr(t->dst_cache, i)->lock); |
cdf3464e MKL |
211 | |
212 | return 0; | |
213 | } | |
214 | EXPORT_SYMBOL_GPL(ip6_tnl_dst_init); | |
215 | ||
1da177e4 | 216 | /** |
3144581c | 217 | * ip6_tnl_lookup - fetch tunnel matching the end-point addresses |
1ab1457c YH |
218 | * @remote: the address of the tunnel exit-point |
219 | * @local: the address of the tunnel entry-point | |
1da177e4 | 220 | * |
1ab1457c | 221 | * Return: |
1da177e4 | 222 | * tunnel matching given end-points if found, |
1ab1457c | 223 | * else fallback tunnel if its device is up, |
1da177e4 LT |
224 | * else %NULL |
225 | **/ | |
226 | ||
2922bc8a ED |
227 | #define for_each_ip6_tunnel_rcu(start) \ |
228 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) | |
229 | ||
1da177e4 | 230 | static struct ip6_tnl * |
b71d1d42 | 231 | ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local) |
1da177e4 | 232 | { |
ddbe5032 | 233 | unsigned int hash = HASH(remote, local); |
1da177e4 | 234 | struct ip6_tnl *t; |
3e6c9fb5 | 235 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
ea3dc960 | 236 | struct in6_addr any; |
1da177e4 | 237 | |
ddbe5032 | 238 | for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { |
1da177e4 LT |
239 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
240 | ipv6_addr_equal(remote, &t->parms.raddr) && | |
241 | (t->dev->flags & IFF_UP)) | |
242 | return t; | |
243 | } | |
ea3dc960 SK |
244 | |
245 | memset(&any, 0, sizeof(any)); | |
246 | hash = HASH(&any, local); | |
247 | for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { | |
248 | if (ipv6_addr_equal(local, &t->parms.laddr) && | |
249 | (t->dev->flags & IFF_UP)) | |
250 | return t; | |
251 | } | |
252 | ||
253 | hash = HASH(remote, &any); | |
254 | for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { | |
255 | if (ipv6_addr_equal(remote, &t->parms.raddr) && | |
256 | (t->dev->flags & IFF_UP)) | |
257 | return t; | |
258 | } | |
259 | ||
2922bc8a ED |
260 | t = rcu_dereference(ip6n->tnls_wc[0]); |
261 | if (t && (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
262 | return t; |
263 | ||
264 | return NULL; | |
265 | } | |
266 | ||
267 | /** | |
3144581c | 268 | * ip6_tnl_bucket - get head of list matching given tunnel parameters |
1ab1457c | 269 | * @p: parameters containing tunnel end-points |
1da177e4 LT |
270 | * |
271 | * Description: | |
3144581c | 272 | * ip6_tnl_bucket() returns the head of the list matching the |
1da177e4 LT |
273 | * &struct in6_addr entries laddr and raddr in @p. |
274 | * | |
1ab1457c | 275 | * Return: head of IPv6 tunnel list |
1da177e4 LT |
276 | **/ |
277 | ||
94767632 | 278 | static struct ip6_tnl __rcu ** |
c12b395a | 279 | ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p) |
1da177e4 | 280 | { |
b71d1d42 ED |
281 | const struct in6_addr *remote = &p->raddr; |
282 | const struct in6_addr *local = &p->laddr; | |
95c96174 | 283 | unsigned int h = 0; |
1da177e4 LT |
284 | int prio = 0; |
285 | ||
286 | if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { | |
287 | prio = 1; | |
ddbe5032 | 288 | h = HASH(remote, local); |
1da177e4 | 289 | } |
3e6c9fb5 | 290 | return &ip6n->tnls[prio][h]; |
1da177e4 LT |
291 | } |
292 | ||
293 | /** | |
3144581c | 294 | * ip6_tnl_link - add tunnel to hash table |
1da177e4 LT |
295 | * @t: tunnel to be added |
296 | **/ | |
297 | ||
298 | static void | |
2dd02c89 | 299 | ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 300 | { |
94767632 | 301 | struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms); |
1da177e4 | 302 | |
cf778b00 ED |
303 | rcu_assign_pointer(t->next , rtnl_dereference(*tp)); |
304 | rcu_assign_pointer(*tp, t); | |
1da177e4 LT |
305 | } |
306 | ||
307 | /** | |
3144581c | 308 | * ip6_tnl_unlink - remove tunnel from hash table |
1da177e4 LT |
309 | * @t: tunnel to be removed |
310 | **/ | |
311 | ||
312 | static void | |
2dd02c89 | 313 | ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 314 | { |
94767632 ED |
315 | struct ip6_tnl __rcu **tp; |
316 | struct ip6_tnl *iter; | |
317 | ||
318 | for (tp = ip6_tnl_bucket(ip6n, &t->parms); | |
319 | (iter = rtnl_dereference(*tp)) != NULL; | |
320 | tp = &iter->next) { | |
321 | if (t == iter) { | |
cf778b00 | 322 | rcu_assign_pointer(*tp, t->next); |
1da177e4 LT |
323 | break; |
324 | } | |
325 | } | |
326 | } | |
327 | ||
8560f226 ED |
328 | static void ip6_dev_free(struct net_device *dev) |
329 | { | |
cdf3464e MKL |
330 | struct ip6_tnl *t = netdev_priv(dev); |
331 | ||
332 | ip6_tnl_dst_destroy(t); | |
8560f226 ED |
333 | free_percpu(dev->tstats); |
334 | free_netdev(dev); | |
335 | } | |
336 | ||
0b112457 ND |
337 | static int ip6_tnl_create2(struct net_device *dev) |
338 | { | |
339 | struct ip6_tnl *t = netdev_priv(dev); | |
340 | struct net *net = dev_net(dev); | |
341 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
342 | int err; | |
343 | ||
344 | t = netdev_priv(dev); | |
0b112457 ND |
345 | |
346 | err = register_netdevice(dev); | |
347 | if (err < 0) | |
348 | goto out; | |
349 | ||
350 | strcpy(t->parms.name, dev->name); | |
351 | dev->rtnl_link_ops = &ip6_link_ops; | |
352 | ||
353 | dev_hold(dev); | |
354 | ip6_tnl_link(ip6n, t); | |
355 | return 0; | |
356 | ||
357 | out: | |
358 | return err; | |
359 | } | |
360 | ||
1da177e4 | 361 | /** |
2c53040f | 362 | * ip6_tnl_create - create a new tunnel |
1da177e4 LT |
363 | * @p: tunnel parameters |
364 | * @pt: pointer to new tunnel | |
365 | * | |
366 | * Description: | |
367 | * Create tunnel matching given parameters. | |
1ab1457c YH |
368 | * |
369 | * Return: | |
37355565 | 370 | * created tunnel or error pointer |
1da177e4 LT |
371 | **/ |
372 | ||
c12b395a | 373 | static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p) |
1da177e4 LT |
374 | { |
375 | struct net_device *dev; | |
376 | struct ip6_tnl *t; | |
377 | char name[IFNAMSIZ]; | |
37355565 | 378 | int err = -ENOMEM; |
1da177e4 | 379 | |
34cc7ba6 | 380 | if (p->name[0]) |
1da177e4 | 381 | strlcpy(name, p->name, IFNAMSIZ); |
34cc7ba6 PE |
382 | else |
383 | sprintf(name, "ip6tnl%%d"); | |
384 | ||
c835a677 TG |
385 | dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, |
386 | ip6_tnl_dev_setup); | |
63159f29 | 387 | if (!dev) |
567131a7 | 388 | goto failed; |
1da177e4 | 389 | |
554eb277 PE |
390 | dev_net_set(dev, net); |
391 | ||
2941a486 | 392 | t = netdev_priv(dev); |
1da177e4 | 393 | t->parms = *p; |
0bd87628 | 394 | t->net = dev_net(dev); |
0b112457 | 395 | err = ip6_tnl_create2(dev); |
8560f226 ED |
396 | if (err < 0) |
397 | goto failed_free; | |
1da177e4 | 398 | |
567131a7 | 399 | return t; |
b37d428b PE |
400 | |
401 | failed_free: | |
8560f226 | 402 | ip6_dev_free(dev); |
567131a7 | 403 | failed: |
37355565 | 404 | return ERR_PTR(err); |
1da177e4 LT |
405 | } |
406 | ||
407 | /** | |
3144581c | 408 | * ip6_tnl_locate - find or create tunnel matching given parameters |
1ab1457c | 409 | * @p: tunnel parameters |
1da177e4 LT |
410 | * @create: != 0 if allowed to create new tunnel if no match found |
411 | * | |
412 | * Description: | |
3144581c | 413 | * ip6_tnl_locate() first tries to locate an existing tunnel |
1da177e4 LT |
414 | * based on @parms. If this is unsuccessful, but @create is set a new |
415 | * tunnel device is created and registered for use. | |
416 | * | |
417 | * Return: | |
37355565 | 418 | * matching tunnel or error pointer |
1da177e4 LT |
419 | **/ |
420 | ||
2dd02c89 | 421 | static struct ip6_tnl *ip6_tnl_locate(struct net *net, |
c12b395a | 422 | struct __ip6_tnl_parm *p, int create) |
1da177e4 | 423 | { |
b71d1d42 ED |
424 | const struct in6_addr *remote = &p->raddr; |
425 | const struct in6_addr *local = &p->laddr; | |
94767632 | 426 | struct ip6_tnl __rcu **tp; |
1da177e4 | 427 | struct ip6_tnl *t; |
2dd02c89 | 428 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 429 | |
94767632 ED |
430 | for (tp = ip6_tnl_bucket(ip6n, p); |
431 | (t = rtnl_dereference(*tp)) != NULL; | |
432 | tp = &t->next) { | |
1da177e4 | 433 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
2b0bb01b SK |
434 | ipv6_addr_equal(remote, &t->parms.raddr)) { |
435 | if (create) | |
37355565 | 436 | return ERR_PTR(-EEXIST); |
2b0bb01b | 437 | |
567131a7 | 438 | return t; |
2b0bb01b | 439 | } |
1da177e4 LT |
440 | } |
441 | if (!create) | |
37355565 | 442 | return ERR_PTR(-ENODEV); |
2dd02c89 | 443 | return ip6_tnl_create(net, p); |
1da177e4 LT |
444 | } |
445 | ||
446 | /** | |
3144581c | 447 | * ip6_tnl_dev_uninit - tunnel device uninitializer |
1da177e4 | 448 | * @dev: the device to be destroyed |
1ab1457c | 449 | * |
1da177e4 | 450 | * Description: |
3144581c | 451 | * ip6_tnl_dev_uninit() removes tunnel from its list |
1da177e4 LT |
452 | **/ |
453 | ||
454 | static void | |
3144581c | 455 | ip6_tnl_dev_uninit(struct net_device *dev) |
1da177e4 | 456 | { |
2941a486 | 457 | struct ip6_tnl *t = netdev_priv(dev); |
0bd87628 | 458 | struct net *net = t->net; |
2dd02c89 | 459 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 460 | |
94767632 | 461 | if (dev == ip6n->fb_tnl_dev) |
a9b3cd7f | 462 | RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL); |
94767632 | 463 | else |
2dd02c89 | 464 | ip6_tnl_unlink(ip6n, t); |
1da177e4 LT |
465 | ip6_tnl_dst_reset(t); |
466 | dev_put(dev); | |
467 | } | |
468 | ||
469 | /** | |
470 | * parse_tvl_tnl_enc_lim - handle encapsulation limit option | |
471 | * @skb: received socket buffer | |
472 | * | |
1ab1457c YH |
473 | * Return: |
474 | * 0 if none was found, | |
1da177e4 LT |
475 | * else index to encapsulation limit |
476 | **/ | |
477 | ||
c12b395a | 478 | __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw) |
1da177e4 | 479 | { |
b71d1d42 | 480 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw; |
1da177e4 | 481 | __u8 nexthdr = ipv6h->nexthdr; |
67ba4152 | 482 | __u16 off = sizeof(*ipv6h); |
1da177e4 LT |
483 | |
484 | while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { | |
485 | __u16 optlen = 0; | |
486 | struct ipv6_opt_hdr *hdr; | |
67ba4152 | 487 | if (raw + off + sizeof(*hdr) > skb->data && |
1da177e4 LT |
488 | !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr))) |
489 | break; | |
490 | ||
491 | hdr = (struct ipv6_opt_hdr *) (raw + off); | |
492 | if (nexthdr == NEXTHDR_FRAGMENT) { | |
493 | struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; | |
494 | if (frag_hdr->frag_off) | |
495 | break; | |
496 | optlen = 8; | |
497 | } else if (nexthdr == NEXTHDR_AUTH) { | |
498 | optlen = (hdr->hdrlen + 2) << 2; | |
499 | } else { | |
500 | optlen = ipv6_optlen(hdr); | |
501 | } | |
502 | if (nexthdr == NEXTHDR_DEST) { | |
503 | __u16 i = off + 2; | |
504 | while (1) { | |
505 | struct ipv6_tlv_tnl_enc_lim *tel; | |
506 | ||
507 | /* No more room for encapsulation limit */ | |
508 | if (i + sizeof (*tel) > off + optlen) | |
509 | break; | |
510 | ||
511 | tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i]; | |
512 | /* return index of option if found and valid */ | |
513 | if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && | |
514 | tel->length == 1) | |
515 | return i; | |
516 | /* else jump to next option */ | |
517 | if (tel->type) | |
518 | i += tel->length + 2; | |
519 | else | |
520 | i++; | |
521 | } | |
522 | } | |
523 | nexthdr = hdr->nexthdr; | |
524 | off += optlen; | |
525 | } | |
526 | return 0; | |
527 | } | |
c12b395a | 528 | EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim); |
1da177e4 LT |
529 | |
530 | /** | |
e490d1d8 | 531 | * ip6_tnl_err - tunnel error handler |
1da177e4 LT |
532 | * |
533 | * Description: | |
e490d1d8 | 534 | * ip6_tnl_err() should handle errors in the tunnel according |
1da177e4 LT |
535 | * to the specifications in RFC 2473. |
536 | **/ | |
537 | ||
d2acc347 | 538 | static int |
502b0935 | 539 | ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, |
d5fdd6ba | 540 | u8 *type, u8 *code, int *msg, __u32 *info, int offset) |
1da177e4 | 541 | { |
b71d1d42 | 542 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data; |
1da177e4 LT |
543 | struct ip6_tnl *t; |
544 | int rel_msg = 0; | |
d5fdd6ba BH |
545 | u8 rel_type = ICMPV6_DEST_UNREACH; |
546 | u8 rel_code = ICMPV6_ADDR_UNREACH; | |
acf722f7 | 547 | u8 tproto; |
1da177e4 LT |
548 | __u32 rel_info = 0; |
549 | __u16 len; | |
d2acc347 | 550 | int err = -ENOENT; |
1da177e4 | 551 | |
1ab1457c YH |
552 | /* If the packet doesn't contain the original IPv6 header we are |
553 | in trouble since we might need the source address for further | |
1da177e4 LT |
554 | processing of the error. */ |
555 | ||
2922bc8a | 556 | rcu_read_lock(); |
e5d08d71 | 557 | t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, &ipv6h->saddr); |
63159f29 | 558 | if (!t) |
1da177e4 LT |
559 | goto out; |
560 | ||
acf722f7 AA |
561 | tproto = ACCESS_ONCE(t->parms.proto); |
562 | if (tproto != ipproto && tproto != 0) | |
502b0935 YK |
563 | goto out; |
564 | ||
d2acc347 HX |
565 | err = 0; |
566 | ||
e490d1d8 | 567 | switch (*type) { |
1da177e4 LT |
568 | __u32 teli; |
569 | struct ipv6_tlv_tnl_enc_lim *tel; | |
570 | __u32 mtu; | |
571 | case ICMPV6_DEST_UNREACH: | |
17a10c92 MB |
572 | net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n", |
573 | t->parms.name); | |
1da177e4 LT |
574 | rel_msg = 1; |
575 | break; | |
576 | case ICMPV6_TIME_EXCEED: | |
e490d1d8 | 577 | if ((*code) == ICMPV6_EXC_HOPLIMIT) { |
17a10c92 MB |
578 | net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", |
579 | t->parms.name); | |
1da177e4 LT |
580 | rel_msg = 1; |
581 | } | |
582 | break; | |
583 | case ICMPV6_PARAMPROB: | |
107a5fe6 | 584 | teli = 0; |
e490d1d8 | 585 | if ((*code) == ICMPV6_HDR_FIELD) |
c12b395a | 586 | teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); |
1da177e4 | 587 | |
704eae1f | 588 | if (teli && teli == *info - 2) { |
1da177e4 LT |
589 | tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; |
590 | if (tel->encap_limit == 0) { | |
17a10c92 MB |
591 | net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", |
592 | t->parms.name); | |
1da177e4 LT |
593 | rel_msg = 1; |
594 | } | |
e87cc472 | 595 | } else { |
17a10c92 MB |
596 | net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n", |
597 | t->parms.name); | |
1da177e4 LT |
598 | } |
599 | break; | |
600 | case ICMPV6_PKT_TOOBIG: | |
704eae1f | 601 | mtu = *info - offset; |
1da177e4 LT |
602 | if (mtu < IPV6_MIN_MTU) |
603 | mtu = IPV6_MIN_MTU; | |
604 | t->dev->mtu = mtu; | |
605 | ||
e5d08d71 IM |
606 | len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len); |
607 | if (len > mtu) { | |
1da177e4 LT |
608 | rel_type = ICMPV6_PKT_TOOBIG; |
609 | rel_code = 0; | |
610 | rel_info = mtu; | |
611 | rel_msg = 1; | |
612 | } | |
613 | break; | |
614 | } | |
e490d1d8 YK |
615 | |
616 | *type = rel_type; | |
617 | *code = rel_code; | |
618 | *info = rel_info; | |
619 | *msg = rel_msg; | |
620 | ||
621 | out: | |
2922bc8a | 622 | rcu_read_unlock(); |
e490d1d8 YK |
623 | return err; |
624 | } | |
625 | ||
c4d3efaf YK |
626 | static int |
627 | ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 628 | u8 type, u8 code, int offset, __be32 info) |
c4d3efaf YK |
629 | { |
630 | int rel_msg = 0; | |
d5fdd6ba BH |
631 | u8 rel_type = type; |
632 | u8 rel_code = code; | |
704eae1f | 633 | __u32 rel_info = ntohl(info); |
c4d3efaf YK |
634 | int err; |
635 | struct sk_buff *skb2; | |
b71d1d42 | 636 | const struct iphdr *eiph; |
c4d3efaf | 637 | struct rtable *rt; |
31e4543d | 638 | struct flowi4 fl4; |
c4d3efaf | 639 | |
502b0935 YK |
640 | err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, |
641 | &rel_msg, &rel_info, offset); | |
c4d3efaf YK |
642 | if (err < 0) |
643 | return err; | |
644 | ||
645 | if (rel_msg == 0) | |
646 | return 0; | |
647 | ||
648 | switch (rel_type) { | |
649 | case ICMPV6_DEST_UNREACH: | |
650 | if (rel_code != ICMPV6_ADDR_UNREACH) | |
651 | return 0; | |
652 | rel_type = ICMP_DEST_UNREACH; | |
653 | rel_code = ICMP_HOST_UNREACH; | |
654 | break; | |
655 | case ICMPV6_PKT_TOOBIG: | |
656 | if (rel_code != 0) | |
657 | return 0; | |
658 | rel_type = ICMP_DEST_UNREACH; | |
659 | rel_code = ICMP_FRAG_NEEDED; | |
660 | break; | |
ec18d9a2 DM |
661 | case NDISC_REDIRECT: |
662 | rel_type = ICMP_REDIRECT; | |
663 | rel_code = ICMP_REDIR_HOST; | |
c4d3efaf YK |
664 | default: |
665 | return 0; | |
666 | } | |
667 | ||
668 | if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) | |
669 | return 0; | |
670 | ||
671 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
672 | if (!skb2) | |
673 | return 0; | |
674 | ||
adf30907 ED |
675 | skb_dst_drop(skb2); |
676 | ||
c4d3efaf | 677 | skb_pull(skb2, offset); |
c1d2bbe1 | 678 | skb_reset_network_header(skb2); |
eddc9ec5 | 679 | eiph = ip_hdr(skb2); |
c4d3efaf YK |
680 | |
681 | /* Try to guess incoming interface */ | |
31e4543d | 682 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, |
78fbfd8a DM |
683 | eiph->saddr, 0, |
684 | 0, 0, | |
685 | IPPROTO_IPIP, RT_TOS(eiph->tos), 0); | |
b23dd4fe | 686 | if (IS_ERR(rt)) |
c4d3efaf YK |
687 | goto out; |
688 | ||
d8d1f30b | 689 | skb2->dev = rt->dst.dev; |
c4d3efaf YK |
690 | |
691 | /* route "incoming" packet */ | |
692 | if (rt->rt_flags & RTCF_LOCAL) { | |
693 | ip_rt_put(rt); | |
694 | rt = NULL; | |
31e4543d | 695 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, |
78fbfd8a DM |
696 | eiph->daddr, eiph->saddr, |
697 | 0, 0, | |
698 | IPPROTO_IPIP, | |
699 | RT_TOS(eiph->tos), 0); | |
b23dd4fe | 700 | if (IS_ERR(rt) || |
d8d1f30b | 701 | rt->dst.dev->type != ARPHRD_TUNNEL) { |
b23dd4fe DM |
702 | if (!IS_ERR(rt)) |
703 | ip_rt_put(rt); | |
c4d3efaf YK |
704 | goto out; |
705 | } | |
b23dd4fe | 706 | skb_dst_set(skb2, &rt->dst); |
c4d3efaf YK |
707 | } else { |
708 | ip_rt_put(rt); | |
709 | if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, | |
710 | skb2->dev) || | |
adf30907 | 711 | skb_dst(skb2)->dev->type != ARPHRD_TUNNEL) |
c4d3efaf YK |
712 | goto out; |
713 | } | |
714 | ||
715 | /* change mtu on this route */ | |
716 | if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { | |
adf30907 | 717 | if (rel_info > dst_mtu(skb_dst(skb2))) |
c4d3efaf YK |
718 | goto out; |
719 | ||
6700c270 | 720 | skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2, rel_info); |
c4d3efaf | 721 | } |
1ed5c48f | 722 | if (rel_type == ICMP_REDIRECT) |
6700c270 | 723 | skb_dst(skb2)->ops->redirect(skb_dst(skb2), NULL, skb2); |
c4d3efaf | 724 | |
704eae1f | 725 | icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); |
c4d3efaf YK |
726 | |
727 | out: | |
728 | kfree_skb(skb2); | |
729 | return 0; | |
730 | } | |
731 | ||
e490d1d8 YK |
732 | static int |
733 | ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 734 | u8 type, u8 code, int offset, __be32 info) |
e490d1d8 YK |
735 | { |
736 | int rel_msg = 0; | |
d5fdd6ba BH |
737 | u8 rel_type = type; |
738 | u8 rel_code = code; | |
704eae1f | 739 | __u32 rel_info = ntohl(info); |
e490d1d8 YK |
740 | int err; |
741 | ||
502b0935 YK |
742 | err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, |
743 | &rel_msg, &rel_info, offset); | |
e490d1d8 YK |
744 | if (err < 0) |
745 | return err; | |
746 | ||
747 | if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { | |
1da177e4 LT |
748 | struct rt6_info *rt; |
749 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
305d4b3c | 750 | |
1da177e4 | 751 | if (!skb2) |
e490d1d8 | 752 | return 0; |
1da177e4 | 753 | |
adf30907 | 754 | skb_dst_drop(skb2); |
1da177e4 | 755 | skb_pull(skb2, offset); |
c1d2bbe1 | 756 | skb_reset_network_header(skb2); |
1da177e4 LT |
757 | |
758 | /* Try to guess incoming interface */ | |
2f7f54b7 PE |
759 | rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, |
760 | NULL, 0, 0); | |
1da177e4 | 761 | |
d1918542 DM |
762 | if (rt && rt->dst.dev) |
763 | skb2->dev = rt->dst.dev; | |
1da177e4 | 764 | |
3ffe533c | 765 | icmpv6_send(skb2, rel_type, rel_code, rel_info); |
1da177e4 | 766 | |
94e187c0 | 767 | ip6_rt_put(rt); |
1da177e4 LT |
768 | |
769 | kfree_skb(skb2); | |
770 | } | |
e490d1d8 YK |
771 | |
772 | return 0; | |
1da177e4 LT |
773 | } |
774 | ||
f4e0b4c5 ND |
775 | static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
776 | const struct ipv6hdr *ipv6h, | |
777 | struct sk_buff *skb) | |
c4d3efaf YK |
778 | { |
779 | __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; | |
780 | ||
781 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) | |
eddc9ec5 | 782 | ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); |
c4d3efaf | 783 | |
f4e0b4c5 | 784 | return IP6_ECN_decapsulate(ipv6h, skb); |
c4d3efaf YK |
785 | } |
786 | ||
f4e0b4c5 ND |
787 | static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
788 | const struct ipv6hdr *ipv6h, | |
789 | struct sk_buff *skb) | |
1da177e4 | 790 | { |
8359925b | 791 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) |
29bb43b4 | 792 | ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); |
1da177e4 | 793 | |
f4e0b4c5 | 794 | return IP6_ECN_decapsulate(ipv6h, skb); |
1da177e4 | 795 | } |
8359925b | 796 | |
c12b395a | 797 | __u32 ip6_tnl_get_cap(struct ip6_tnl *t, |
d0087b29 VN |
798 | const struct in6_addr *laddr, |
799 | const struct in6_addr *raddr) | |
800 | { | |
c12b395a | 801 | struct __ip6_tnl_parm *p = &t->parms; |
d0087b29 VN |
802 | int ltype = ipv6_addr_type(laddr); |
803 | int rtype = ipv6_addr_type(raddr); | |
804 | __u32 flags = 0; | |
805 | ||
806 | if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) { | |
807 | flags = IP6_TNL_F_CAP_PER_PACKET; | |
808 | } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
809 | rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
810 | !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && | |
811 | (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { | |
812 | if (ltype&IPV6_ADDR_UNICAST) | |
813 | flags |= IP6_TNL_F_CAP_XMIT; | |
814 | if (rtype&IPV6_ADDR_UNICAST) | |
815 | flags |= IP6_TNL_F_CAP_RCV; | |
816 | } | |
817 | return flags; | |
818 | } | |
c12b395a | 819 | EXPORT_SYMBOL(ip6_tnl_get_cap); |
d0087b29 | 820 | |
f1a28eab | 821 | /* called with rcu_read_lock() */ |
c12b395a | 822 | int ip6_tnl_rcv_ctl(struct ip6_tnl *t, |
d0087b29 VN |
823 | const struct in6_addr *laddr, |
824 | const struct in6_addr *raddr) | |
09c6bbf0 | 825 | { |
c12b395a | 826 | struct __ip6_tnl_parm *p = &t->parms; |
09c6bbf0 | 827 | int ret = 0; |
0bd87628 | 828 | struct net *net = t->net; |
09c6bbf0 | 829 | |
d0087b29 VN |
830 | if ((p->flags & IP6_TNL_F_CAP_RCV) || |
831 | ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && | |
832 | (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) { | |
1ab1457c | 833 | struct net_device *ldev = NULL; |
09c6bbf0 VN |
834 | |
835 | if (p->link) | |
f1a28eab | 836 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 837 | |
d0087b29 VN |
838 | if ((ipv6_addr_is_multicast(laddr) || |
839 | likely(ipv6_chk_addr(net, laddr, ldev, 0))) && | |
840 | likely(!ipv6_chk_addr(net, raddr, NULL, 0))) | |
09c6bbf0 | 841 | ret = 1; |
09c6bbf0 VN |
842 | } |
843 | return ret; | |
844 | } | |
c12b395a | 845 | EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl); |
1da177e4 LT |
846 | |
847 | /** | |
3144581c | 848 | * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally |
1da177e4 | 849 | * @skb: received socket buffer |
8359925b YK |
850 | * @protocol: ethernet protocol ID |
851 | * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN | |
1da177e4 LT |
852 | * |
853 | * Return: 0 | |
854 | **/ | |
855 | ||
8359925b | 856 | static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol, |
502b0935 | 857 | __u8 ipproto, |
f4e0b4c5 ND |
858 | int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, |
859 | const struct ipv6hdr *ipv6h, | |
860 | struct sk_buff *skb)) | |
1da177e4 | 861 | { |
1da177e4 | 862 | struct ip6_tnl *t; |
b71d1d42 | 863 | const struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
acf722f7 | 864 | u8 tproto; |
f4e0b4c5 | 865 | int err; |
1da177e4 | 866 | |
2922bc8a | 867 | rcu_read_lock(); |
e5d08d71 | 868 | t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr); |
53b24b8f | 869 | if (t) { |
8f84985f | 870 | struct pcpu_sw_netstats *tstats; |
8560f226 | 871 | |
acf722f7 AA |
872 | tproto = ACCESS_ONCE(t->parms.proto); |
873 | if (tproto != ipproto && tproto != 0) { | |
2922bc8a | 874 | rcu_read_unlock(); |
502b0935 YK |
875 | goto discard; |
876 | } | |
877 | ||
1da177e4 | 878 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
2922bc8a | 879 | rcu_read_unlock(); |
50fba2aa | 880 | goto discard; |
1da177e4 LT |
881 | } |
882 | ||
d0087b29 | 883 | if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) { |
3dca02af | 884 | t->dev->stats.rx_dropped++; |
2922bc8a | 885 | rcu_read_unlock(); |
1da177e4 LT |
886 | goto discard; |
887 | } | |
b0e380b1 | 888 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 889 | skb_reset_network_header(skb); |
8359925b | 890 | skb->protocol = htons(protocol); |
1da177e4 | 891 | memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); |
8359925b | 892 | |
ea23192e | 893 | __skb_tunnel_rx(skb, t->dev, t->net); |
f4e0b4c5 ND |
894 | |
895 | err = dscp_ecn_decapsulate(t, ipv6h, skb); | |
896 | if (unlikely(err)) { | |
897 | if (log_ecn_error) | |
898 | net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n", | |
899 | &ipv6h->saddr, | |
900 | ipv6_get_dsfield(ipv6h)); | |
901 | if (err > 1) { | |
902 | ++t->dev->stats.rx_frame_errors; | |
903 | ++t->dev->stats.rx_errors; | |
904 | rcu_read_unlock(); | |
905 | goto discard; | |
906 | } | |
907 | } | |
908 | ||
8560f226 | 909 | tstats = this_cpu_ptr(t->dev->tstats); |
abb6013c | 910 | u64_stats_update_begin(&tstats->syncp); |
8560f226 ED |
911 | tstats->rx_packets++; |
912 | tstats->rx_bytes += skb->len; | |
abb6013c | 913 | u64_stats_update_end(&tstats->syncp); |
8560f226 | 914 | |
caf586e5 | 915 | netif_rx(skb); |
8990f468 | 916 | |
2922bc8a | 917 | rcu_read_unlock(); |
1da177e4 LT |
918 | return 0; |
919 | } | |
2922bc8a | 920 | rcu_read_unlock(); |
1da177e4 | 921 | return 1; |
50fba2aa HX |
922 | |
923 | discard: | |
924 | kfree_skb(skb); | |
925 | return 0; | |
1da177e4 LT |
926 | } |
927 | ||
c4d3efaf YK |
928 | static int ip4ip6_rcv(struct sk_buff *skb) |
929 | { | |
502b0935 YK |
930 | return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP, |
931 | ip4ip6_dscp_ecn_decapsulate); | |
c4d3efaf YK |
932 | } |
933 | ||
8359925b YK |
934 | static int ip6ip6_rcv(struct sk_buff *skb) |
935 | { | |
502b0935 YK |
936 | return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6, |
937 | ip6ip6_dscp_ecn_decapsulate); | |
8359925b YK |
938 | } |
939 | ||
6fb32dde VN |
940 | struct ipv6_tel_txoption { |
941 | struct ipv6_txoptions ops; | |
942 | __u8 dst_opt[8]; | |
943 | }; | |
1da177e4 | 944 | |
6fb32dde VN |
945 | static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) |
946 | { | |
947 | memset(opt, 0, sizeof(struct ipv6_tel_txoption)); | |
1da177e4 | 948 | |
6fb32dde VN |
949 | opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; |
950 | opt->dst_opt[3] = 1; | |
951 | opt->dst_opt[4] = encap_limit; | |
952 | opt->dst_opt[5] = IPV6_TLV_PADN; | |
953 | opt->dst_opt[6] = 1; | |
1da177e4 | 954 | |
6fb32dde VN |
955 | opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; |
956 | opt->ops.opt_nflen = 8; | |
1da177e4 LT |
957 | } |
958 | ||
959 | /** | |
3144581c | 960 | * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own |
1da177e4 | 961 | * @t: the outgoing tunnel device |
1ab1457c | 962 | * @hdr: IPv6 header from the incoming packet |
1da177e4 LT |
963 | * |
964 | * Description: | |
1ab1457c | 965 | * Avoid trivial tunneling loop by checking that tunnel exit-point |
1da177e4 LT |
966 | * doesn't match source of incoming packet. |
967 | * | |
1ab1457c | 968 | * Return: |
1da177e4 LT |
969 | * 1 if conflict, |
970 | * 0 else | |
971 | **/ | |
972 | ||
92113bfd | 973 | static inline bool |
b71d1d42 | 974 | ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) |
1da177e4 LT |
975 | { |
976 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
977 | } | |
978 | ||
d5005140 SK |
979 | int ip6_tnl_xmit_ctl(struct ip6_tnl *t, |
980 | const struct in6_addr *laddr, | |
981 | const struct in6_addr *raddr) | |
09c6bbf0 | 982 | { |
c12b395a | 983 | struct __ip6_tnl_parm *p = &t->parms; |
09c6bbf0 | 984 | int ret = 0; |
0bd87628 | 985 | struct net *net = t->net; |
09c6bbf0 | 986 | |
d5005140 SK |
987 | if ((p->flags & IP6_TNL_F_CAP_XMIT) || |
988 | ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && | |
989 | (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) { | |
09c6bbf0 VN |
990 | struct net_device *ldev = NULL; |
991 | ||
f1a28eab | 992 | rcu_read_lock(); |
09c6bbf0 | 993 | if (p->link) |
f1a28eab | 994 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 995 | |
d5005140 | 996 | if (unlikely(!ipv6_chk_addr(net, laddr, ldev, 0))) |
f3213831 JP |
997 | pr_warn("%s xmit: Local address not yet configured!\n", |
998 | p->name); | |
d5005140 SK |
999 | else if (!ipv6_addr_is_multicast(raddr) && |
1000 | unlikely(ipv6_chk_addr(net, raddr, NULL, 0))) | |
f3213831 JP |
1001 | pr_warn("%s xmit: Routing loop! Remote address found on this node!\n", |
1002 | p->name); | |
09c6bbf0 VN |
1003 | else |
1004 | ret = 1; | |
f1a28eab | 1005 | rcu_read_unlock(); |
09c6bbf0 VN |
1006 | } |
1007 | return ret; | |
1008 | } | |
c12b395a | 1009 | EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl); |
1010 | ||
1da177e4 | 1011 | /** |
61ec2aec | 1012 | * ip6_tnl_xmit2 - encapsulate packet and send |
1da177e4 | 1013 | * @skb: the outgoing socket buffer |
1ab1457c | 1014 | * @dev: the outgoing tunnel device |
61ec2aec YK |
1015 | * @dsfield: dscp code for outer header |
1016 | * @fl: flow of tunneled packet | |
1017 | * @encap_limit: encapsulation limit | |
1018 | * @pmtu: Path MTU is stored if packet is too big | |
1da177e4 LT |
1019 | * |
1020 | * Description: | |
1021 | * Build new header and do some sanity checks on the packet before sending | |
1022 | * it. | |
1023 | * | |
1ab1457c | 1024 | * Return: |
c4d3efaf | 1025 | * 0 on success |
61ec2aec YK |
1026 | * -1 fail |
1027 | * %-EMSGSIZE message too big. return mtu in this case. | |
1da177e4 LT |
1028 | **/ |
1029 | ||
61ec2aec YK |
1030 | static int ip6_tnl_xmit2(struct sk_buff *skb, |
1031 | struct net_device *dev, | |
1032 | __u8 dsfield, | |
4c9483b2 | 1033 | struct flowi6 *fl6, |
61ec2aec YK |
1034 | int encap_limit, |
1035 | __u32 *pmtu) | |
1da177e4 | 1036 | { |
2941a486 | 1037 | struct ip6_tnl *t = netdev_priv(dev); |
0bd87628 | 1038 | struct net *net = t->net; |
3dca02af | 1039 | struct net_device_stats *stats = &t->dev->stats; |
0660e03f | 1040 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
6fb32dde | 1041 | struct ipv6_tel_txoption opt; |
d24f22f3 | 1042 | struct dst_entry *dst = NULL, *ndst = NULL; |
1da177e4 LT |
1043 | struct net_device *tdev; |
1044 | int mtu; | |
c2636b4d | 1045 | unsigned int max_headroom = sizeof(struct ipv6hdr); |
1da177e4 | 1046 | u8 proto; |
61ec2aec | 1047 | int err = -1; |
1da177e4 | 1048 | |
ea3dc960 SK |
1049 | /* NBMA tunnel */ |
1050 | if (ipv6_addr_any(&t->parms.raddr)) { | |
1051 | struct in6_addr *addr6; | |
1052 | struct neighbour *neigh; | |
1053 | int addr_type; | |
1054 | ||
1055 | if (!skb_dst(skb)) | |
1056 | goto tx_err_link_failure; | |
1057 | ||
1058 | neigh = dst_neigh_lookup(skb_dst(skb), | |
1059 | &ipv6_hdr(skb)->daddr); | |
1060 | if (!neigh) | |
1061 | goto tx_err_link_failure; | |
1062 | ||
1063 | addr6 = (struct in6_addr *)&neigh->primary_key; | |
1064 | addr_type = ipv6_addr_type(addr6); | |
1065 | ||
1066 | if (addr_type == IPV6_ADDR_ANY) | |
1067 | addr6 = &ipv6_hdr(skb)->daddr; | |
1068 | ||
1069 | memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr)); | |
1070 | neigh_release(neigh); | |
1071 | } else if (!fl6->flowi6_mark) | |
f230d1e8 | 1072 | dst = ip6_tnl_dst_get(t); |
d5005140 SK |
1073 | |
1074 | if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr)) | |
1075 | goto tx_err_link_failure; | |
1076 | ||
89b02126 | 1077 | if (!dst) { |
cdf3464e | 1078 | dst = ip6_route_output(net, NULL, fl6); |
1da177e4 | 1079 | |
cdf3464e | 1080 | if (dst->error) |
a57ebc90 | 1081 | goto tx_err_link_failure; |
cdf3464e MKL |
1082 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0); |
1083 | if (IS_ERR(dst)) { | |
1084 | err = PTR_ERR(dst); | |
1085 | dst = NULL; | |
452edd59 DM |
1086 | goto tx_err_link_failure; |
1087 | } | |
cdf3464e | 1088 | ndst = dst; |
a57ebc90 | 1089 | } |
1da177e4 LT |
1090 | |
1091 | tdev = dst->dev; | |
1092 | ||
1093 | if (tdev == dev) { | |
1094 | stats->collisions++; | |
e87cc472 JP |
1095 | net_warn_ratelimited("%s: Local routing loop detected!\n", |
1096 | t->parms.name); | |
1da177e4 LT |
1097 | goto tx_err_dst_release; |
1098 | } | |
67ba4152 | 1099 | mtu = dst_mtu(dst) - sizeof(*ipv6h); |
6fb32dde | 1100 | if (encap_limit >= 0) { |
1da177e4 LT |
1101 | max_headroom += 8; |
1102 | mtu -= 8; | |
1103 | } | |
1104 | if (mtu < IPV6_MIN_MTU) | |
1105 | mtu = IPV6_MIN_MTU; | |
adf30907 | 1106 | if (skb_dst(skb)) |
6700c270 | 1107 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); |
1da177e4 | 1108 | if (skb->len > mtu) { |
61ec2aec YK |
1109 | *pmtu = mtu; |
1110 | err = -EMSGSIZE; | |
1da177e4 LT |
1111 | goto tx_err_dst_release; |
1112 | } | |
1113 | ||
963a88b3 | 1114 | skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev))); |
0bd87628 | 1115 | |
1da177e4 LT |
1116 | /* |
1117 | * Okay, now see if we can stuff it in the buffer as-is. | |
1118 | */ | |
1119 | max_headroom += LL_RESERVED_SPACE(tdev); | |
1ab1457c | 1120 | |
cfbba49d PM |
1121 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
1122 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 | 1123 | struct sk_buff *new_skb; |
1ab1457c | 1124 | |
e5d08d71 IM |
1125 | new_skb = skb_realloc_headroom(skb, max_headroom); |
1126 | if (!new_skb) | |
1da177e4 LT |
1127 | goto tx_err_dst_release; |
1128 | ||
1129 | if (skb->sk) | |
1130 | skb_set_owner_w(new_skb, skb->sk); | |
9ff26449 | 1131 | consume_skb(skb); |
1da177e4 LT |
1132 | skb = new_skb; |
1133 | } | |
cdf3464e MKL |
1134 | |
1135 | if (!fl6->flowi6_mark && ndst) | |
1136 | ip6_tnl_dst_set(t, ndst); | |
1137 | skb_dst_set(skb, dst); | |
1138 | ||
b0e380b1 | 1139 | skb->transport_header = skb->network_header; |
1da177e4 | 1140 | |
4c9483b2 | 1141 | proto = fl6->flowi6_proto; |
6fb32dde VN |
1142 | if (encap_limit >= 0) { |
1143 | init_tel_txopt(&opt, encap_limit); | |
1144 | ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); | |
1145 | } | |
3d483058 HFS |
1146 | |
1147 | if (likely(!skb->encapsulation)) { | |
1148 | skb_reset_inner_headers(skb); | |
1149 | skb->encapsulation = 1; | |
1150 | } | |
1151 | ||
e2d1bca7 ACM |
1152 | skb_push(skb, sizeof(struct ipv6hdr)); |
1153 | skb_reset_network_header(skb); | |
0660e03f | 1154 | ipv6h = ipv6_hdr(skb); |
cb1ce2ef | 1155 | ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), |
42240901 | 1156 | ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6)); |
1da177e4 LT |
1157 | ipv6h->hop_limit = t->parms.hop_limit; |
1158 | ipv6h->nexthdr = proto; | |
4e3fd7a0 AD |
1159 | ipv6h->saddr = fl6->saddr; |
1160 | ipv6h->daddr = fl6->daddr; | |
79b16aad | 1161 | ip6tunnel_xmit(NULL, skb, dev); |
1da177e4 LT |
1162 | return 0; |
1163 | tx_err_link_failure: | |
1164 | stats->tx_carrier_errors++; | |
1165 | dst_link_failure(skb); | |
1166 | tx_err_dst_release: | |
cdf3464e | 1167 | dst_release(dst); |
61ec2aec YK |
1168 | return err; |
1169 | } | |
1170 | ||
c4d3efaf YK |
1171 | static inline int |
1172 | ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1173 | { | |
1174 | struct ip6_tnl *t = netdev_priv(dev); | |
b71d1d42 | 1175 | const struct iphdr *iph = ip_hdr(skb); |
c4d3efaf | 1176 | int encap_limit = -1; |
4c9483b2 | 1177 | struct flowi6 fl6; |
c4d3efaf YK |
1178 | __u8 dsfield; |
1179 | __u32 mtu; | |
acf722f7 | 1180 | u8 tproto; |
c4d3efaf YK |
1181 | int err; |
1182 | ||
5146d1f1 BH |
1183 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
1184 | ||
acf722f7 | 1185 | tproto = ACCESS_ONCE(t->parms.proto); |
d5005140 | 1186 | if (tproto != IPPROTO_IPIP && tproto != 0) |
c4d3efaf YK |
1187 | return -1; |
1188 | ||
1189 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1190 | encap_limit = t->parms.encap_limit; | |
1191 | ||
67ba4152 | 1192 | memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); |
4c9483b2 | 1193 | fl6.flowi6_proto = IPPROTO_IPIP; |
c4d3efaf YK |
1194 | |
1195 | dsfield = ipv4_get_dsfield(iph); | |
1196 | ||
d24f22f3 | 1197 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
4c9483b2 | 1198 | fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) |
b77f2fa6 | 1199 | & IPV6_TCLASS_MASK; |
d24f22f3 ED |
1200 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
1201 | fl6.flowi6_mark = skb->mark; | |
c4d3efaf | 1202 | |
4c9483b2 | 1203 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); |
c4d3efaf YK |
1204 | if (err != 0) { |
1205 | /* XXX: send ICMP error even if DF is not set. */ | |
1206 | if (err == -EMSGSIZE) | |
1207 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
1208 | htonl(mtu)); | |
1209 | return -1; | |
1210 | } | |
1211 | ||
1212 | return 0; | |
1213 | } | |
1214 | ||
61ec2aec YK |
1215 | static inline int |
1216 | ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1217 | { | |
1218 | struct ip6_tnl *t = netdev_priv(dev); | |
0660e03f | 1219 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
61ec2aec YK |
1220 | int encap_limit = -1; |
1221 | __u16 offset; | |
4c9483b2 | 1222 | struct flowi6 fl6; |
61ec2aec YK |
1223 | __u8 dsfield; |
1224 | __u32 mtu; | |
acf722f7 | 1225 | u8 tproto; |
61ec2aec YK |
1226 | int err; |
1227 | ||
acf722f7 AA |
1228 | tproto = ACCESS_ONCE(t->parms.proto); |
1229 | if ((tproto != IPPROTO_IPV6 && tproto != 0) || | |
d5005140 | 1230 | ip6_tnl_addr_conflict(t, ipv6h)) |
61ec2aec YK |
1231 | return -1; |
1232 | ||
c12b395a | 1233 | offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); |
d56f90a7 | 1234 | if (offset > 0) { |
61ec2aec | 1235 | struct ipv6_tlv_tnl_enc_lim *tel; |
d56f90a7 | 1236 | tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; |
61ec2aec YK |
1237 | if (tel->encap_limit == 0) { |
1238 | icmpv6_send(skb, ICMPV6_PARAMPROB, | |
3ffe533c | 1239 | ICMPV6_HDR_FIELD, offset + 2); |
61ec2aec YK |
1240 | return -1; |
1241 | } | |
1242 | encap_limit = tel->encap_limit - 1; | |
1243 | } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1244 | encap_limit = t->parms.encap_limit; | |
1245 | ||
67ba4152 | 1246 | memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); |
4c9483b2 | 1247 | fl6.flowi6_proto = IPPROTO_IPV6; |
61ec2aec YK |
1248 | |
1249 | dsfield = ipv6_get_dsfield(ipv6h); | |
d24f22f3 | 1250 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
4c9483b2 | 1251 | fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); |
d24f22f3 | 1252 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) |
3308de2b | 1253 | fl6.flowlabel |= ip6_flowlabel(ipv6h); |
d24f22f3 ED |
1254 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
1255 | fl6.flowi6_mark = skb->mark; | |
61ec2aec | 1256 | |
4c9483b2 | 1257 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); |
61ec2aec YK |
1258 | if (err != 0) { |
1259 | if (err == -EMSGSIZE) | |
3ffe533c | 1260 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
61ec2aec YK |
1261 | return -1; |
1262 | } | |
1263 | ||
1264 | return 0; | |
1265 | } | |
1266 | ||
6fef4c0c | 1267 | static netdev_tx_t |
61ec2aec YK |
1268 | ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) |
1269 | { | |
1270 | struct ip6_tnl *t = netdev_priv(dev); | |
3dca02af | 1271 | struct net_device_stats *stats = &t->dev->stats; |
61ec2aec YK |
1272 | int ret; |
1273 | ||
61ec2aec | 1274 | switch (skb->protocol) { |
60678040 | 1275 | case htons(ETH_P_IP): |
c4d3efaf YK |
1276 | ret = ip4ip6_tnl_xmit(skb, dev); |
1277 | break; | |
60678040 | 1278 | case htons(ETH_P_IPV6): |
61ec2aec YK |
1279 | ret = ip6ip6_tnl_xmit(skb, dev); |
1280 | break; | |
1281 | default: | |
1282 | goto tx_err; | |
1283 | } | |
1284 | ||
1285 | if (ret < 0) | |
1286 | goto tx_err; | |
1287 | ||
6ed10654 | 1288 | return NETDEV_TX_OK; |
61ec2aec | 1289 | |
1da177e4 LT |
1290 | tx_err: |
1291 | stats->tx_errors++; | |
1292 | stats->tx_dropped++; | |
1293 | kfree_skb(skb); | |
6ed10654 | 1294 | return NETDEV_TX_OK; |
1da177e4 LT |
1295 | } |
1296 | ||
3144581c | 1297 | static void ip6_tnl_link_config(struct ip6_tnl *t) |
1da177e4 LT |
1298 | { |
1299 | struct net_device *dev = t->dev; | |
c12b395a | 1300 | struct __ip6_tnl_parm *p = &t->parms; |
4c9483b2 | 1301 | struct flowi6 *fl6 = &t->fl.u.ip6; |
1da177e4 | 1302 | |
3a6d54c5 JP |
1303 | memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); |
1304 | memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
1da177e4 LT |
1305 | |
1306 | /* Set up flowi template */ | |
4e3fd7a0 AD |
1307 | fl6->saddr = p->laddr; |
1308 | fl6->daddr = p->raddr; | |
4c9483b2 DM |
1309 | fl6->flowi6_oif = p->link; |
1310 | fl6->flowlabel = 0; | |
1da177e4 LT |
1311 | |
1312 | if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) | |
4c9483b2 | 1313 | fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; |
1da177e4 | 1314 | if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) |
4c9483b2 | 1315 | fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; |
1da177e4 | 1316 | |
d0087b29 VN |
1317 | p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); |
1318 | p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); | |
1da177e4 LT |
1319 | |
1320 | if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) | |
1321 | dev->flags |= IFF_POINTOPOINT; | |
1322 | else | |
1323 | dev->flags &= ~IFF_POINTOPOINT; | |
1324 | ||
1da177e4 | 1325 | if (p->flags & IP6_TNL_F_CAP_XMIT) { |
305d4b3c VN |
1326 | int strict = (ipv6_addr_type(&p->raddr) & |
1327 | (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); | |
1328 | ||
0bd87628 | 1329 | struct rt6_info *rt = rt6_lookup(t->net, |
2f7f54b7 | 1330 | &p->raddr, &p->laddr, |
305d4b3c | 1331 | p->link, strict); |
1da177e4 | 1332 | |
63159f29 | 1333 | if (!rt) |
1da177e4 LT |
1334 | return; |
1335 | ||
d1918542 DM |
1336 | if (rt->dst.dev) { |
1337 | dev->hard_header_len = rt->dst.dev->hard_header_len + | |
67ba4152 | 1338 | sizeof(struct ipv6hdr); |
1da177e4 | 1339 | |
67ba4152 | 1340 | dev->mtu = rt->dst.dev->mtu - sizeof(struct ipv6hdr); |
381601e5 | 1341 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
67ba4152 | 1342 | dev->mtu -= 8; |
1da177e4 LT |
1343 | |
1344 | if (dev->mtu < IPV6_MIN_MTU) | |
1345 | dev->mtu = IPV6_MIN_MTU; | |
1346 | } | |
94e187c0 | 1347 | ip6_rt_put(rt); |
1da177e4 LT |
1348 | } |
1349 | } | |
1350 | ||
1351 | /** | |
3144581c | 1352 | * ip6_tnl_change - update the tunnel parameters |
1da177e4 LT |
1353 | * @t: tunnel to be changed |
1354 | * @p: tunnel configuration parameters | |
1da177e4 LT |
1355 | * |
1356 | * Description: | |
3144581c | 1357 | * ip6_tnl_change() updates the tunnel parameters |
1da177e4 LT |
1358 | **/ |
1359 | ||
1360 | static int | |
c12b395a | 1361 | ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) |
1da177e4 | 1362 | { |
4e3fd7a0 AD |
1363 | t->parms.laddr = p->laddr; |
1364 | t->parms.raddr = p->raddr; | |
1da177e4 LT |
1365 | t->parms.flags = p->flags; |
1366 | t->parms.hop_limit = p->hop_limit; | |
1367 | t->parms.encap_limit = p->encap_limit; | |
1368 | t->parms.flowinfo = p->flowinfo; | |
8181b8c1 | 1369 | t->parms.link = p->link; |
502b0935 | 1370 | t->parms.proto = p->proto; |
0c088890 | 1371 | ip6_tnl_dst_reset(t); |
3144581c | 1372 | ip6_tnl_link_config(t); |
1da177e4 LT |
1373 | return 0; |
1374 | } | |
1375 | ||
0b112457 ND |
1376 | static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) |
1377 | { | |
0bd87628 | 1378 | struct net *net = t->net; |
0b112457 ND |
1379 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1380 | int err; | |
1381 | ||
1382 | ip6_tnl_unlink(ip6n, t); | |
1383 | synchronize_net(); | |
1384 | err = ip6_tnl_change(t, p); | |
1385 | ip6_tnl_link(ip6n, t); | |
1386 | netdev_state_change(t->dev); | |
1387 | return err; | |
1388 | } | |
1389 | ||
acf722f7 AA |
1390 | static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) |
1391 | { | |
1392 | /* for default tnl0 device allow to change only the proto */ | |
1393 | t->parms.proto = p->proto; | |
1394 | netdev_state_change(t->dev); | |
1395 | return 0; | |
1396 | } | |
1397 | ||
c12b395a | 1398 | static void |
1399 | ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u) | |
1400 | { | |
1401 | p->laddr = u->laddr; | |
1402 | p->raddr = u->raddr; | |
1403 | p->flags = u->flags; | |
1404 | p->hop_limit = u->hop_limit; | |
1405 | p->encap_limit = u->encap_limit; | |
1406 | p->flowinfo = u->flowinfo; | |
1407 | p->link = u->link; | |
1408 | p->proto = u->proto; | |
1409 | memcpy(p->name, u->name, sizeof(u->name)); | |
1410 | } | |
1411 | ||
1412 | static void | |
1413 | ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p) | |
1414 | { | |
1415 | u->laddr = p->laddr; | |
1416 | u->raddr = p->raddr; | |
1417 | u->flags = p->flags; | |
1418 | u->hop_limit = p->hop_limit; | |
1419 | u->encap_limit = p->encap_limit; | |
1420 | u->flowinfo = p->flowinfo; | |
1421 | u->link = p->link; | |
1422 | u->proto = p->proto; | |
1423 | memcpy(u->name, p->name, sizeof(u->name)); | |
1424 | } | |
1425 | ||
1da177e4 | 1426 | /** |
3144581c | 1427 | * ip6_tnl_ioctl - configure ipv6 tunnels from userspace |
1da177e4 LT |
1428 | * @dev: virtual device associated with tunnel |
1429 | * @ifr: parameters passed from userspace | |
1430 | * @cmd: command to be performed | |
1431 | * | |
1432 | * Description: | |
3144581c | 1433 | * ip6_tnl_ioctl() is used for managing IPv6 tunnels |
1ab1457c | 1434 | * from userspace. |
1da177e4 LT |
1435 | * |
1436 | * The possible commands are the following: | |
1437 | * %SIOCGETTUNNEL: get tunnel parameters for device | |
1438 | * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters | |
1439 | * %SIOCCHGTUNNEL: change tunnel parameters to those given | |
1440 | * %SIOCDELTUNNEL: delete tunnel | |
1441 | * | |
1ab1457c | 1442 | * The fallback device "ip6tnl0", created during module |
1da177e4 LT |
1443 | * initialization, can be used for creating other tunnel devices. |
1444 | * | |
1445 | * Return: | |
1446 | * 0 on success, | |
1447 | * %-EFAULT if unable to copy data to or from userspace, | |
1448 | * %-EPERM if current process hasn't %CAP_NET_ADMIN set | |
1449 | * %-EINVAL if passed tunnel parameters are invalid, | |
1450 | * %-EEXIST if changing a tunnel's parameters would cause a conflict | |
1451 | * %-ENODEV if attempting to change or delete a nonexisting device | |
1452 | **/ | |
1453 | ||
1454 | static int | |
3144581c | 1455 | ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
1da177e4 LT |
1456 | { |
1457 | int err = 0; | |
1da177e4 | 1458 | struct ip6_tnl_parm p; |
c12b395a | 1459 | struct __ip6_tnl_parm p1; |
74462f0d ND |
1460 | struct ip6_tnl *t = netdev_priv(dev); |
1461 | struct net *net = t->net; | |
2dd02c89 | 1462 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 LT |
1463 | |
1464 | switch (cmd) { | |
1465 | case SIOCGETTUNNEL: | |
15820e12 | 1466 | if (dev == ip6n->fb_tnl_dev) { |
67ba4152 | 1467 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
1da177e4 LT |
1468 | err = -EFAULT; |
1469 | break; | |
1470 | } | |
c12b395a | 1471 | ip6_tnl_parm_from_user(&p1, &p); |
1472 | t = ip6_tnl_locate(net, &p1, 0); | |
37355565 | 1473 | if (IS_ERR(t)) |
74462f0d | 1474 | t = netdev_priv(dev); |
5ef5d6c5 DC |
1475 | } else { |
1476 | memset(&p, 0, sizeof(p)); | |
567131a7 | 1477 | } |
c12b395a | 1478 | ip6_tnl_parm_to_user(&p, &t->parms); |
67ba4152 | 1479 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) { |
1da177e4 LT |
1480 | err = -EFAULT; |
1481 | } | |
1482 | break; | |
1483 | case SIOCADDTUNNEL: | |
1484 | case SIOCCHGTUNNEL: | |
1485 | err = -EPERM; | |
af31f412 | 1486 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 1487 | break; |
567131a7 | 1488 | err = -EFAULT; |
67ba4152 | 1489 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
1da177e4 | 1490 | break; |
567131a7 | 1491 | err = -EINVAL; |
502b0935 YK |
1492 | if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && |
1493 | p.proto != 0) | |
1da177e4 | 1494 | break; |
c12b395a | 1495 | ip6_tnl_parm_from_user(&p1, &p); |
1496 | t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL); | |
acf722f7 | 1497 | if (cmd == SIOCCHGTUNNEL) { |
37355565 | 1498 | if (!IS_ERR(t)) { |
567131a7 VN |
1499 | if (t->dev != dev) { |
1500 | err = -EEXIST; | |
1501 | break; | |
1502 | } | |
1503 | } else | |
1504 | t = netdev_priv(dev); | |
acf722f7 AA |
1505 | if (dev == ip6n->fb_tnl_dev) |
1506 | err = ip6_tnl0_update(t, &p1); | |
1507 | else | |
1508 | err = ip6_tnl_update(t, &p1); | |
1da177e4 | 1509 | } |
37355565 | 1510 | if (!IS_ERR(t)) { |
1da177e4 | 1511 | err = 0; |
c12b395a | 1512 | ip6_tnl_parm_to_user(&p, &t->parms); |
1513 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
567131a7 VN |
1514 | err = -EFAULT; |
1515 | ||
37355565 ND |
1516 | } else { |
1517 | err = PTR_ERR(t); | |
1518 | } | |
1da177e4 LT |
1519 | break; |
1520 | case SIOCDELTUNNEL: | |
1521 | err = -EPERM; | |
af31f412 | 1522 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1523 | break; |
1524 | ||
15820e12 | 1525 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 | 1526 | err = -EFAULT; |
67ba4152 | 1527 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
1da177e4 | 1528 | break; |
567131a7 | 1529 | err = -ENOENT; |
c12b395a | 1530 | ip6_tnl_parm_from_user(&p1, &p); |
1531 | t = ip6_tnl_locate(net, &p1, 0); | |
37355565 | 1532 | if (IS_ERR(t)) |
1da177e4 | 1533 | break; |
567131a7 | 1534 | err = -EPERM; |
15820e12 | 1535 | if (t->dev == ip6n->fb_tnl_dev) |
1da177e4 | 1536 | break; |
567131a7 | 1537 | dev = t->dev; |
1da177e4 | 1538 | } |
22f8cde5 SH |
1539 | err = 0; |
1540 | unregister_netdevice(dev); | |
1da177e4 LT |
1541 | break; |
1542 | default: | |
1543 | err = -EINVAL; | |
1544 | } | |
1545 | return err; | |
1546 | } | |
1547 | ||
1da177e4 | 1548 | /** |
3144581c | 1549 | * ip6_tnl_change_mtu - change mtu manually for tunnel device |
1da177e4 LT |
1550 | * @dev: virtual device associated with tunnel |
1551 | * @new_mtu: the new mtu | |
1552 | * | |
1553 | * Return: | |
1554 | * 0 on success, | |
1555 | * %-EINVAL if mtu too small | |
1556 | **/ | |
1557 | ||
1558 | static int | |
3144581c | 1559 | ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) |
1da177e4 | 1560 | { |
582442d6 OG |
1561 | struct ip6_tnl *tnl = netdev_priv(dev); |
1562 | ||
1563 | if (tnl->parms.proto == IPPROTO_IPIP) { | |
1564 | if (new_mtu < 68) | |
1565 | return -EINVAL; | |
1566 | } else { | |
1567 | if (new_mtu < IPV6_MIN_MTU) | |
1568 | return -EINVAL; | |
1da177e4 | 1569 | } |
582442d6 OG |
1570 | if (new_mtu > 0xFFF8 - dev->hard_header_len) |
1571 | return -EINVAL; | |
1da177e4 LT |
1572 | dev->mtu = new_mtu; |
1573 | return 0; | |
1574 | } | |
1575 | ||
ecf2c06a ND |
1576 | int ip6_tnl_get_iflink(const struct net_device *dev) |
1577 | { | |
1578 | struct ip6_tnl *t = netdev_priv(dev); | |
1579 | ||
1580 | return t->parms.link; | |
1581 | } | |
1582 | EXPORT_SYMBOL(ip6_tnl_get_iflink); | |
1326c3d5 SH |
1583 | |
1584 | static const struct net_device_ops ip6_tnl_netdev_ops = { | |
6c6151da | 1585 | .ndo_init = ip6_tnl_dev_init, |
8560f226 | 1586 | .ndo_uninit = ip6_tnl_dev_uninit, |
1326c3d5 | 1587 | .ndo_start_xmit = ip6_tnl_xmit, |
8560f226 | 1588 | .ndo_do_ioctl = ip6_tnl_ioctl, |
1326c3d5 | 1589 | .ndo_change_mtu = ip6_tnl_change_mtu, |
8560f226 | 1590 | .ndo_get_stats = ip6_get_stats, |
ecf2c06a | 1591 | .ndo_get_iflink = ip6_tnl_get_iflink, |
1326c3d5 SH |
1592 | }; |
1593 | ||
8560f226 | 1594 | |
1da177e4 | 1595 | /** |
3144581c | 1596 | * ip6_tnl_dev_setup - setup virtual tunnel device |
1da177e4 LT |
1597 | * @dev: virtual device associated with tunnel |
1598 | * | |
1599 | * Description: | |
1600 | * Initialize function pointers and device parameters | |
1601 | **/ | |
1602 | ||
3144581c | 1603 | static void ip6_tnl_dev_setup(struct net_device *dev) |
1da177e4 | 1604 | { |
381601e5 AF |
1605 | struct ip6_tnl *t; |
1606 | ||
1326c3d5 | 1607 | dev->netdev_ops = &ip6_tnl_netdev_ops; |
8560f226 | 1608 | dev->destructor = ip6_dev_free; |
1da177e4 LT |
1609 | |
1610 | dev->type = ARPHRD_TUNNEL6; | |
67ba4152 IM |
1611 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr); |
1612 | dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr); | |
381601e5 AF |
1613 | t = netdev_priv(dev); |
1614 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
67ba4152 | 1615 | dev->mtu -= 8; |
1da177e4 LT |
1616 | dev->flags |= IFF_NOARP; |
1617 | dev->addr_len = sizeof(struct in6_addr); | |
02875878 | 1618 | netif_keep_dst(dev); |
e837735e ND |
1619 | /* This perm addr will be used as interface identifier by IPv6 */ |
1620 | dev->addr_assign_type = NET_ADDR_RANDOM; | |
1621 | eth_random_addr(dev->perm_addr); | |
1da177e4 LT |
1622 | } |
1623 | ||
1624 | ||
1625 | /** | |
3144581c | 1626 | * ip6_tnl_dev_init_gen - general initializer for all tunnel devices |
1da177e4 LT |
1627 | * @dev: virtual device associated with tunnel |
1628 | **/ | |
1629 | ||
8560f226 | 1630 | static inline int |
3144581c | 1631 | ip6_tnl_dev_init_gen(struct net_device *dev) |
1da177e4 | 1632 | { |
2941a486 | 1633 | struct ip6_tnl *t = netdev_priv(dev); |
cdf3464e | 1634 | int ret; |
8560f226 | 1635 | |
1da177e4 | 1636 | t->dev = dev; |
0bd87628 | 1637 | t->net = dev_net(dev); |
1c213bd2 | 1638 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
8560f226 ED |
1639 | if (!dev->tstats) |
1640 | return -ENOMEM; | |
cdf3464e MKL |
1641 | |
1642 | ret = ip6_tnl_dst_init(t); | |
1643 | if (ret) { | |
1644 | free_percpu(dev->tstats); | |
1645 | dev->tstats = NULL; | |
1646 | return ret; | |
1647 | } | |
1648 | ||
8560f226 | 1649 | return 0; |
1da177e4 LT |
1650 | } |
1651 | ||
1652 | /** | |
3144581c | 1653 | * ip6_tnl_dev_init - initializer for all non fallback tunnel devices |
1da177e4 LT |
1654 | * @dev: virtual device associated with tunnel |
1655 | **/ | |
1656 | ||
8560f226 | 1657 | static int ip6_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1658 | { |
2941a486 | 1659 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 ED |
1660 | int err = ip6_tnl_dev_init_gen(dev); |
1661 | ||
1662 | if (err) | |
1663 | return err; | |
3144581c | 1664 | ip6_tnl_link_config(t); |
8560f226 | 1665 | return 0; |
1da177e4 LT |
1666 | } |
1667 | ||
1668 | /** | |
3144581c | 1669 | * ip6_fb_tnl_dev_init - initializer for fallback tunnel device |
1da177e4 LT |
1670 | * @dev: fallback device |
1671 | * | |
1672 | * Return: 0 | |
1673 | **/ | |
1674 | ||
8560f226 | 1675 | static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1676 | { |
2941a486 | 1677 | struct ip6_tnl *t = netdev_priv(dev); |
3e6c9fb5 PE |
1678 | struct net *net = dev_net(dev); |
1679 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1680 | ||
502b0935 | 1681 | t->parms.proto = IPPROTO_IPV6; |
1da177e4 | 1682 | dev_hold(dev); |
d0087b29 | 1683 | |
cf778b00 | 1684 | rcu_assign_pointer(ip6n->tnls_wc[0], t); |
8560f226 | 1685 | return 0; |
1da177e4 LT |
1686 | } |
1687 | ||
0b112457 ND |
1688 | static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[]) |
1689 | { | |
1690 | u8 proto; | |
1691 | ||
c8965932 | 1692 | if (!data || !data[IFLA_IPTUN_PROTO]) |
0b112457 ND |
1693 | return 0; |
1694 | ||
1695 | proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1696 | if (proto != IPPROTO_IPV6 && | |
1697 | proto != IPPROTO_IPIP && | |
1698 | proto != 0) | |
1699 | return -EINVAL; | |
1700 | ||
1701 | return 0; | |
1702 | } | |
1703 | ||
1704 | static void ip6_tnl_netlink_parms(struct nlattr *data[], | |
1705 | struct __ip6_tnl_parm *parms) | |
1706 | { | |
1707 | memset(parms, 0, sizeof(*parms)); | |
1708 | ||
1709 | if (!data) | |
1710 | return; | |
1711 | ||
1712 | if (data[IFLA_IPTUN_LINK]) | |
1713 | parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); | |
1714 | ||
1715 | if (data[IFLA_IPTUN_LOCAL]) | |
67b61f6c | 1716 | parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]); |
0b112457 ND |
1717 | |
1718 | if (data[IFLA_IPTUN_REMOTE]) | |
67b61f6c | 1719 | parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]); |
0b112457 ND |
1720 | |
1721 | if (data[IFLA_IPTUN_TTL]) | |
1722 | parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]); | |
1723 | ||
1724 | if (data[IFLA_IPTUN_ENCAP_LIMIT]) | |
1725 | parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]); | |
1726 | ||
1727 | if (data[IFLA_IPTUN_FLOWINFO]) | |
1ff05fb7 | 1728 | parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]); |
0b112457 ND |
1729 | |
1730 | if (data[IFLA_IPTUN_FLAGS]) | |
1731 | parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]); | |
1732 | ||
1733 | if (data[IFLA_IPTUN_PROTO]) | |
1734 | parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1735 | } | |
1736 | ||
1737 | static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev, | |
1738 | struct nlattr *tb[], struct nlattr *data[]) | |
1739 | { | |
1740 | struct net *net = dev_net(dev); | |
37355565 | 1741 | struct ip6_tnl *nt, *t; |
0b112457 ND |
1742 | |
1743 | nt = netdev_priv(dev); | |
1744 | ip6_tnl_netlink_parms(data, &nt->parms); | |
1745 | ||
37355565 ND |
1746 | t = ip6_tnl_locate(net, &nt->parms, 0); |
1747 | if (!IS_ERR(t)) | |
0b112457 ND |
1748 | return -EEXIST; |
1749 | ||
1750 | return ip6_tnl_create2(dev); | |
1751 | } | |
1752 | ||
1753 | static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[], | |
1754 | struct nlattr *data[]) | |
1755 | { | |
0bd87628 | 1756 | struct ip6_tnl *t = netdev_priv(dev); |
0b112457 | 1757 | struct __ip6_tnl_parm p; |
0bd87628 | 1758 | struct net *net = t->net; |
0b112457 ND |
1759 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1760 | ||
1761 | if (dev == ip6n->fb_tnl_dev) | |
1762 | return -EINVAL; | |
1763 | ||
1764 | ip6_tnl_netlink_parms(data, &p); | |
1765 | ||
1766 | t = ip6_tnl_locate(net, &p, 0); | |
37355565 | 1767 | if (!IS_ERR(t)) { |
0b112457 ND |
1768 | if (t->dev != dev) |
1769 | return -EEXIST; | |
1770 | } else | |
1771 | t = netdev_priv(dev); | |
1772 | ||
1773 | return ip6_tnl_update(t, &p); | |
1774 | } | |
1775 | ||
1e9f3d6f ND |
1776 | static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head) |
1777 | { | |
1778 | struct net *net = dev_net(dev); | |
1779 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1780 | ||
1781 | if (dev != ip6n->fb_tnl_dev) | |
1782 | unregister_netdevice_queue(dev, head); | |
1783 | } | |
1784 | ||
b58d731a | 1785 | static size_t ip6_tnl_get_size(const struct net_device *dev) |
c075b130 ND |
1786 | { |
1787 | return | |
1788 | /* IFLA_IPTUN_LINK */ | |
1789 | nla_total_size(4) + | |
1790 | /* IFLA_IPTUN_LOCAL */ | |
1791 | nla_total_size(sizeof(struct in6_addr)) + | |
1792 | /* IFLA_IPTUN_REMOTE */ | |
1793 | nla_total_size(sizeof(struct in6_addr)) + | |
1794 | /* IFLA_IPTUN_TTL */ | |
1795 | nla_total_size(1) + | |
1796 | /* IFLA_IPTUN_ENCAP_LIMIT */ | |
1797 | nla_total_size(1) + | |
1798 | /* IFLA_IPTUN_FLOWINFO */ | |
1799 | nla_total_size(4) + | |
1800 | /* IFLA_IPTUN_FLAGS */ | |
1801 | nla_total_size(4) + | |
cfa323b6 ND |
1802 | /* IFLA_IPTUN_PROTO */ |
1803 | nla_total_size(1) + | |
c075b130 ND |
1804 | 0; |
1805 | } | |
1806 | ||
b58d731a | 1807 | static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev) |
c075b130 ND |
1808 | { |
1809 | struct ip6_tnl *tunnel = netdev_priv(dev); | |
1810 | struct __ip6_tnl_parm *parm = &tunnel->parms; | |
1811 | ||
1812 | if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || | |
930345ea JB |
1813 | nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) || |
1814 | nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) || | |
c075b130 ND |
1815 | nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) || |
1816 | nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) || | |
1817 | nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) || | |
cfa323b6 ND |
1818 | nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) || |
1819 | nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto)) | |
c075b130 ND |
1820 | goto nla_put_failure; |
1821 | return 0; | |
1822 | ||
1823 | nla_put_failure: | |
1824 | return -EMSGSIZE; | |
1825 | } | |
1826 | ||
1728d4fa ND |
1827 | struct net *ip6_tnl_get_link_net(const struct net_device *dev) |
1828 | { | |
1829 | struct ip6_tnl *tunnel = netdev_priv(dev); | |
1830 | ||
1831 | return tunnel->net; | |
1832 | } | |
1833 | EXPORT_SYMBOL(ip6_tnl_get_link_net); | |
1834 | ||
0b112457 ND |
1835 | static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = { |
1836 | [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, | |
1837 | [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) }, | |
1838 | [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) }, | |
1839 | [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, | |
1840 | [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 }, | |
1841 | [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 }, | |
1842 | [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 }, | |
1843 | [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, | |
1844 | }; | |
1845 | ||
c075b130 ND |
1846 | static struct rtnl_link_ops ip6_link_ops __read_mostly = { |
1847 | .kind = "ip6tnl", | |
1848 | .maxtype = IFLA_IPTUN_MAX, | |
0b112457 | 1849 | .policy = ip6_tnl_policy, |
c075b130 | 1850 | .priv_size = sizeof(struct ip6_tnl), |
0b112457 ND |
1851 | .setup = ip6_tnl_dev_setup, |
1852 | .validate = ip6_tnl_validate, | |
1853 | .newlink = ip6_tnl_newlink, | |
1854 | .changelink = ip6_tnl_changelink, | |
1e9f3d6f | 1855 | .dellink = ip6_tnl_dellink, |
b58d731a ND |
1856 | .get_size = ip6_tnl_get_size, |
1857 | .fill_info = ip6_tnl_fill_info, | |
1728d4fa | 1858 | .get_link_net = ip6_tnl_get_link_net, |
c075b130 ND |
1859 | }; |
1860 | ||
3ff2cfa5 | 1861 | static struct xfrm6_tunnel ip4ip6_handler __read_mostly = { |
c4d3efaf YK |
1862 | .handler = ip4ip6_rcv, |
1863 | .err_handler = ip4ip6_err, | |
1864 | .priority = 1, | |
1865 | }; | |
1866 | ||
3ff2cfa5 | 1867 | static struct xfrm6_tunnel ip6ip6_handler __read_mostly = { |
0303770d PM |
1868 | .handler = ip6ip6_rcv, |
1869 | .err_handler = ip6ip6_err, | |
d2acc347 | 1870 | .priority = 1, |
1da177e4 LT |
1871 | }; |
1872 | ||
1e9f3d6f | 1873 | static void __net_exit ip6_tnl_destroy_tunnels(struct net *net) |
3e6c9fb5 | 1874 | { |
1e9f3d6f | 1875 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
0bd87628 | 1876 | struct net_device *dev, *aux; |
3e6c9fb5 PE |
1877 | int h; |
1878 | struct ip6_tnl *t; | |
cf4432f5 | 1879 | LIST_HEAD(list); |
3e6c9fb5 | 1880 | |
0bd87628 ND |
1881 | for_each_netdev_safe(net, dev, aux) |
1882 | if (dev->rtnl_link_ops == &ip6_link_ops) | |
1883 | unregister_netdevice_queue(dev, &list); | |
1884 | ||
3e6c9fb5 | 1885 | for (h = 0; h < HASH_SIZE; h++) { |
94767632 | 1886 | t = rtnl_dereference(ip6n->tnls_r_l[h]); |
53b24b8f | 1887 | while (t) { |
0bd87628 ND |
1888 | /* If dev is in the same netns, it has already |
1889 | * been added to the list by the previous loop. | |
1890 | */ | |
1891 | if (!net_eq(dev_net(t->dev), net)) | |
1892 | unregister_netdevice_queue(t->dev, &list); | |
94767632 | 1893 | t = rtnl_dereference(t->next); |
cf4432f5 | 1894 | } |
3e6c9fb5 PE |
1895 | } |
1896 | ||
cf4432f5 | 1897 | unregister_netdevice_many(&list); |
3e6c9fb5 PE |
1898 | } |
1899 | ||
2c8c1e72 | 1900 | static int __net_init ip6_tnl_init_net(struct net *net) |
13eeb8e9 | 1901 | { |
ac31cd3c | 1902 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
731abb9c | 1903 | struct ip6_tnl *t = NULL; |
13eeb8e9 | 1904 | int err; |
13eeb8e9 | 1905 | |
3e6c9fb5 PE |
1906 | ip6n->tnls[0] = ip6n->tnls_wc; |
1907 | ip6n->tnls[1] = ip6n->tnls_r_l; | |
1908 | ||
15820e12 PE |
1909 | err = -ENOMEM; |
1910 | ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", | |
c835a677 | 1911 | NET_NAME_UNKNOWN, ip6_tnl_dev_setup); |
15820e12 PE |
1912 | |
1913 | if (!ip6n->fb_tnl_dev) | |
1914 | goto err_alloc_dev; | |
be77e593 | 1915 | dev_net_set(ip6n->fb_tnl_dev, net); |
bb814094 | 1916 | ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops; |
0bd87628 ND |
1917 | /* FB netdevice is special: we have one, and only one per netns. |
1918 | * Allowing to move it to another netns is clearly unsafe. | |
1919 | */ | |
1920 | ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL; | |
15820e12 | 1921 | |
8560f226 ED |
1922 | err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); |
1923 | if (err < 0) | |
1924 | goto err_register; | |
15820e12 PE |
1925 | |
1926 | err = register_netdev(ip6n->fb_tnl_dev); | |
1927 | if (err < 0) | |
1928 | goto err_register; | |
731abb9c JB |
1929 | |
1930 | t = netdev_priv(ip6n->fb_tnl_dev); | |
1931 | ||
1932 | strcpy(t->parms.name, ip6n->fb_tnl_dev->name); | |
13eeb8e9 PE |
1933 | return 0; |
1934 | ||
15820e12 | 1935 | err_register: |
8560f226 | 1936 | ip6_dev_free(ip6n->fb_tnl_dev); |
15820e12 | 1937 | err_alloc_dev: |
13eeb8e9 PE |
1938 | return err; |
1939 | } | |
1940 | ||
2c8c1e72 | 1941 | static void __net_exit ip6_tnl_exit_net(struct net *net) |
13eeb8e9 | 1942 | { |
3e6c9fb5 | 1943 | rtnl_lock(); |
1e9f3d6f | 1944 | ip6_tnl_destroy_tunnels(net); |
3e6c9fb5 | 1945 | rtnl_unlock(); |
13eeb8e9 PE |
1946 | } |
1947 | ||
1948 | static struct pernet_operations ip6_tnl_net_ops = { | |
1949 | .init = ip6_tnl_init_net, | |
1950 | .exit = ip6_tnl_exit_net, | |
ac31cd3c EB |
1951 | .id = &ip6_tnl_net_id, |
1952 | .size = sizeof(struct ip6_tnl_net), | |
13eeb8e9 PE |
1953 | }; |
1954 | ||
1da177e4 LT |
1955 | /** |
1956 | * ip6_tunnel_init - register protocol and reserve needed resources | |
1957 | * | |
1958 | * Return: 0 on success | |
1959 | **/ | |
1960 | ||
1961 | static int __init ip6_tunnel_init(void) | |
1962 | { | |
1963 | int err; | |
1964 | ||
d5aa407f AD |
1965 | err = register_pernet_device(&ip6_tnl_net_ops); |
1966 | if (err < 0) | |
1967 | goto out_pernet; | |
1968 | ||
1969 | err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET); | |
1970 | if (err < 0) { | |
f3213831 | 1971 | pr_err("%s: can't register ip4ip6\n", __func__); |
d5aa407f | 1972 | goto out_ip4ip6; |
c4d3efaf YK |
1973 | } |
1974 | ||
d5aa407f AD |
1975 | err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6); |
1976 | if (err < 0) { | |
f3213831 | 1977 | pr_err("%s: can't register ip6ip6\n", __func__); |
d5aa407f | 1978 | goto out_ip6ip6; |
1da177e4 | 1979 | } |
c075b130 ND |
1980 | err = rtnl_link_register(&ip6_link_ops); |
1981 | if (err < 0) | |
1982 | goto rtnl_link_failed; | |
13eeb8e9 | 1983 | |
1da177e4 | 1984 | return 0; |
d5aa407f | 1985 | |
c075b130 ND |
1986 | rtnl_link_failed: |
1987 | xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6); | |
d5aa407f | 1988 | out_ip6ip6: |
c4d3efaf | 1989 | xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); |
d5aa407f AD |
1990 | out_ip4ip6: |
1991 | unregister_pernet_device(&ip6_tnl_net_ops); | |
1992 | out_pernet: | |
1da177e4 LT |
1993 | return err; |
1994 | } | |
1995 | ||
1996 | /** | |
1997 | * ip6_tunnel_cleanup - free resources and unregister protocol | |
1998 | **/ | |
1999 | ||
2000 | static void __exit ip6_tunnel_cleanup(void) | |
2001 | { | |
c075b130 | 2002 | rtnl_link_unregister(&ip6_link_ops); |
c4d3efaf | 2003 | if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) |
f3213831 | 2004 | pr_info("%s: can't deregister ip4ip6\n", __func__); |
c4d3efaf | 2005 | |
73d605d1 | 2006 | if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) |
f3213831 | 2007 | pr_info("%s: can't deregister ip6ip6\n", __func__); |
1da177e4 | 2008 | |
ac31cd3c | 2009 | unregister_pernet_device(&ip6_tnl_net_ops); |
1da177e4 LT |
2010 | } |
2011 | ||
2012 | module_init(ip6_tunnel_init); | |
2013 | module_exit(ip6_tunnel_cleanup); |