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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> | |
32 | #include <linux/if_tunnel.h> | |
33 | #include <linux/net.h> | |
34 | #include <linux/in6.h> | |
35 | #include <linux/netdevice.h> | |
36 | #include <linux/if_arp.h> | |
37 | #include <linux/icmpv6.h> | |
38 | #include <linux/init.h> | |
39 | #include <linux/route.h> | |
40 | #include <linux/rtnetlink.h> | |
41 | #include <linux/netfilter_ipv6.h> | |
5a0e3ad6 | 42 | #include <linux/slab.h> |
ddbe5032 | 43 | #include <linux/hash.h> |
1da177e4 LT |
44 | |
45 | #include <asm/uaccess.h> | |
60063497 | 46 | #include <linux/atomic.h> |
1da177e4 | 47 | |
c4d3efaf | 48 | #include <net/icmp.h> |
1da177e4 LT |
49 | #include <net/ip.h> |
50 | #include <net/ipv6.h> | |
1da177e4 LT |
51 | #include <net/ip6_route.h> |
52 | #include <net/addrconf.h> | |
53 | #include <net/ip6_tunnel.h> | |
54 | #include <net/xfrm.h> | |
55 | #include <net/dsfield.h> | |
56 | #include <net/inet_ecn.h> | |
13eeb8e9 PE |
57 | #include <net/net_namespace.h> |
58 | #include <net/netns/generic.h> | |
1da177e4 LT |
59 | |
60 | MODULE_AUTHOR("Ville Nuorvala"); | |
c4d3efaf | 61 | MODULE_DESCRIPTION("IPv6 tunneling device"); |
1da177e4 | 62 | MODULE_LICENSE("GPL"); |
6dfbd87a | 63 | MODULE_ALIAS_NETDEV("ip6tnl0"); |
1da177e4 | 64 | |
1da177e4 | 65 | #ifdef IP6_TNL_DEBUG |
91df42be | 66 | #define IP6_TNL_TRACE(x...) pr_debug("%s:" x "\n", __func__) |
1da177e4 LT |
67 | #else |
68 | #define IP6_TNL_TRACE(x...) do {;} while(0) | |
69 | #endif | |
70 | ||
71 | #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK) | |
c4d3efaf | 72 | #define IPV6_TCLASS_SHIFT 20 |
1da177e4 | 73 | |
ddbe5032 ED |
74 | #define HASH_SIZE_SHIFT 5 |
75 | #define HASH_SIZE (1 << HASH_SIZE_SHIFT) | |
1da177e4 | 76 | |
f4e0b4c5 ND |
77 | static bool log_ecn_error = true; |
78 | module_param(log_ecn_error, bool, 0644); | |
79 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); | |
80 | ||
ddbe5032 ED |
81 | static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2) |
82 | { | |
83 | u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2); | |
84 | ||
85 | return hash_32(hash, HASH_SIZE_SHIFT); | |
86 | } | |
1da177e4 | 87 | |
8560f226 | 88 | static int ip6_tnl_dev_init(struct net_device *dev); |
3144581c | 89 | static void ip6_tnl_dev_setup(struct net_device *dev); |
c075b130 | 90 | static struct rtnl_link_ops ip6_link_ops __read_mostly; |
1da177e4 | 91 | |
f99189b1 | 92 | static int ip6_tnl_net_id __read_mostly; |
13eeb8e9 | 93 | struct ip6_tnl_net { |
15820e12 PE |
94 | /* the IPv6 tunnel fallback device */ |
95 | struct net_device *fb_tnl_dev; | |
3e6c9fb5 | 96 | /* lists for storing tunnels in use */ |
94767632 ED |
97 | struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE]; |
98 | struct ip6_tnl __rcu *tnls_wc[1]; | |
99 | struct ip6_tnl __rcu **tnls[2]; | |
13eeb8e9 PE |
100 | }; |
101 | ||
8560f226 ED |
102 | static struct net_device_stats *ip6_get_stats(struct net_device *dev) |
103 | { | |
104 | struct pcpu_tstats sum = { 0 }; | |
105 | int i; | |
106 | ||
107 | for_each_possible_cpu(i) { | |
108 | const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i); | |
109 | ||
110 | sum.rx_packets += tstats->rx_packets; | |
111 | sum.rx_bytes += tstats->rx_bytes; | |
112 | sum.tx_packets += tstats->tx_packets; | |
113 | sum.tx_bytes += tstats->tx_bytes; | |
114 | } | |
115 | dev->stats.rx_packets = sum.rx_packets; | |
116 | dev->stats.rx_bytes = sum.rx_bytes; | |
117 | dev->stats.tx_packets = sum.tx_packets; | |
118 | dev->stats.tx_bytes = sum.tx_bytes; | |
119 | return &dev->stats; | |
120 | } | |
121 | ||
2922bc8a | 122 | /* |
94767632 | 123 | * Locking : hash tables are protected by RCU and RTNL |
2922bc8a | 124 | */ |
1da177e4 | 125 | |
c12b395a | 126 | struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t) |
1da177e4 LT |
127 | { |
128 | struct dst_entry *dst = t->dst_cache; | |
129 | ||
1ab1457c | 130 | if (dst && dst->obsolete && |
1da177e4 LT |
131 | dst->ops->check(dst, t->dst_cookie) == NULL) { |
132 | t->dst_cache = NULL; | |
133 | dst_release(dst); | |
134 | return NULL; | |
135 | } | |
136 | ||
137 | return dst; | |
138 | } | |
c12b395a | 139 | EXPORT_SYMBOL_GPL(ip6_tnl_dst_check); |
1da177e4 | 140 | |
c12b395a | 141 | void ip6_tnl_dst_reset(struct ip6_tnl *t) |
1da177e4 LT |
142 | { |
143 | dst_release(t->dst_cache); | |
144 | t->dst_cache = NULL; | |
145 | } | |
c12b395a | 146 | EXPORT_SYMBOL_GPL(ip6_tnl_dst_reset); |
1da177e4 | 147 | |
c12b395a | 148 | void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst) |
1da177e4 LT |
149 | { |
150 | struct rt6_info *rt = (struct rt6_info *) dst; | |
151 | t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0; | |
152 | dst_release(t->dst_cache); | |
153 | t->dst_cache = dst; | |
154 | } | |
c12b395a | 155 | EXPORT_SYMBOL_GPL(ip6_tnl_dst_store); |
1da177e4 LT |
156 | |
157 | /** | |
3144581c | 158 | * ip6_tnl_lookup - fetch tunnel matching the end-point addresses |
1ab1457c YH |
159 | * @remote: the address of the tunnel exit-point |
160 | * @local: the address of the tunnel entry-point | |
1da177e4 | 161 | * |
1ab1457c | 162 | * Return: |
1da177e4 | 163 | * tunnel matching given end-points if found, |
1ab1457c | 164 | * else fallback tunnel if its device is up, |
1da177e4 LT |
165 | * else %NULL |
166 | **/ | |
167 | ||
2922bc8a ED |
168 | #define for_each_ip6_tunnel_rcu(start) \ |
169 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) | |
170 | ||
1da177e4 | 171 | static struct ip6_tnl * |
b71d1d42 | 172 | ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local) |
1da177e4 | 173 | { |
ddbe5032 | 174 | unsigned int hash = HASH(remote, local); |
1da177e4 | 175 | struct ip6_tnl *t; |
3e6c9fb5 | 176 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 177 | |
ddbe5032 | 178 | for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { |
1da177e4 LT |
179 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
180 | ipv6_addr_equal(remote, &t->parms.raddr) && | |
181 | (t->dev->flags & IFF_UP)) | |
182 | return t; | |
183 | } | |
2922bc8a ED |
184 | t = rcu_dereference(ip6n->tnls_wc[0]); |
185 | if (t && (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
186 | return t; |
187 | ||
188 | return NULL; | |
189 | } | |
190 | ||
191 | /** | |
3144581c | 192 | * ip6_tnl_bucket - get head of list matching given tunnel parameters |
1ab1457c | 193 | * @p: parameters containing tunnel end-points |
1da177e4 LT |
194 | * |
195 | * Description: | |
3144581c | 196 | * ip6_tnl_bucket() returns the head of the list matching the |
1da177e4 LT |
197 | * &struct in6_addr entries laddr and raddr in @p. |
198 | * | |
1ab1457c | 199 | * Return: head of IPv6 tunnel list |
1da177e4 LT |
200 | **/ |
201 | ||
94767632 | 202 | static struct ip6_tnl __rcu ** |
c12b395a | 203 | ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p) |
1da177e4 | 204 | { |
b71d1d42 ED |
205 | const struct in6_addr *remote = &p->raddr; |
206 | const struct in6_addr *local = &p->laddr; | |
95c96174 | 207 | unsigned int h = 0; |
1da177e4 LT |
208 | int prio = 0; |
209 | ||
210 | if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { | |
211 | prio = 1; | |
ddbe5032 | 212 | h = HASH(remote, local); |
1da177e4 | 213 | } |
3e6c9fb5 | 214 | return &ip6n->tnls[prio][h]; |
1da177e4 LT |
215 | } |
216 | ||
217 | /** | |
3144581c | 218 | * ip6_tnl_link - add tunnel to hash table |
1da177e4 LT |
219 | * @t: tunnel to be added |
220 | **/ | |
221 | ||
222 | static void | |
2dd02c89 | 223 | ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 224 | { |
94767632 | 225 | struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms); |
1da177e4 | 226 | |
cf778b00 ED |
227 | rcu_assign_pointer(t->next , rtnl_dereference(*tp)); |
228 | rcu_assign_pointer(*tp, t); | |
1da177e4 LT |
229 | } |
230 | ||
231 | /** | |
3144581c | 232 | * ip6_tnl_unlink - remove tunnel from hash table |
1da177e4 LT |
233 | * @t: tunnel to be removed |
234 | **/ | |
235 | ||
236 | static void | |
2dd02c89 | 237 | ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 238 | { |
94767632 ED |
239 | struct ip6_tnl __rcu **tp; |
240 | struct ip6_tnl *iter; | |
241 | ||
242 | for (tp = ip6_tnl_bucket(ip6n, &t->parms); | |
243 | (iter = rtnl_dereference(*tp)) != NULL; | |
244 | tp = &iter->next) { | |
245 | if (t == iter) { | |
cf778b00 | 246 | rcu_assign_pointer(*tp, t->next); |
1da177e4 LT |
247 | break; |
248 | } | |
249 | } | |
250 | } | |
251 | ||
8560f226 ED |
252 | static void ip6_dev_free(struct net_device *dev) |
253 | { | |
254 | free_percpu(dev->tstats); | |
255 | free_netdev(dev); | |
256 | } | |
257 | ||
0b112457 ND |
258 | static int ip6_tnl_create2(struct net_device *dev) |
259 | { | |
260 | struct ip6_tnl *t = netdev_priv(dev); | |
261 | struct net *net = dev_net(dev); | |
262 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
263 | int err; | |
264 | ||
265 | t = netdev_priv(dev); | |
266 | err = ip6_tnl_dev_init(dev); | |
267 | if (err < 0) | |
268 | goto out; | |
269 | ||
270 | err = register_netdevice(dev); | |
271 | if (err < 0) | |
272 | goto out; | |
273 | ||
274 | strcpy(t->parms.name, dev->name); | |
275 | dev->rtnl_link_ops = &ip6_link_ops; | |
276 | ||
277 | dev_hold(dev); | |
278 | ip6_tnl_link(ip6n, t); | |
279 | return 0; | |
280 | ||
281 | out: | |
282 | return err; | |
283 | } | |
284 | ||
1da177e4 | 285 | /** |
2c53040f | 286 | * ip6_tnl_create - create a new tunnel |
1da177e4 LT |
287 | * @p: tunnel parameters |
288 | * @pt: pointer to new tunnel | |
289 | * | |
290 | * Description: | |
291 | * Create tunnel matching given parameters. | |
1ab1457c YH |
292 | * |
293 | * Return: | |
567131a7 | 294 | * created tunnel or NULL |
1da177e4 LT |
295 | **/ |
296 | ||
c12b395a | 297 | static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p) |
1da177e4 LT |
298 | { |
299 | struct net_device *dev; | |
300 | struct ip6_tnl *t; | |
301 | char name[IFNAMSIZ]; | |
302 | int err; | |
303 | ||
34cc7ba6 | 304 | if (p->name[0]) |
1da177e4 | 305 | strlcpy(name, p->name, IFNAMSIZ); |
34cc7ba6 PE |
306 | else |
307 | sprintf(name, "ip6tnl%%d"); | |
308 | ||
3144581c | 309 | dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup); |
1da177e4 | 310 | if (dev == NULL) |
567131a7 | 311 | goto failed; |
1da177e4 | 312 | |
554eb277 PE |
313 | dev_net_set(dev, net); |
314 | ||
2941a486 | 315 | t = netdev_priv(dev); |
1da177e4 | 316 | t->parms = *p; |
0b112457 | 317 | err = ip6_tnl_create2(dev); |
8560f226 ED |
318 | if (err < 0) |
319 | goto failed_free; | |
1da177e4 | 320 | |
567131a7 | 321 | return t; |
b37d428b PE |
322 | |
323 | failed_free: | |
8560f226 | 324 | ip6_dev_free(dev); |
567131a7 VN |
325 | failed: |
326 | return NULL; | |
1da177e4 LT |
327 | } |
328 | ||
329 | /** | |
3144581c | 330 | * ip6_tnl_locate - find or create tunnel matching given parameters |
1ab1457c | 331 | * @p: tunnel parameters |
1da177e4 LT |
332 | * @create: != 0 if allowed to create new tunnel if no match found |
333 | * | |
334 | * Description: | |
3144581c | 335 | * ip6_tnl_locate() first tries to locate an existing tunnel |
1da177e4 LT |
336 | * based on @parms. If this is unsuccessful, but @create is set a new |
337 | * tunnel device is created and registered for use. | |
338 | * | |
339 | * Return: | |
567131a7 | 340 | * matching tunnel or NULL |
1da177e4 LT |
341 | **/ |
342 | ||
2dd02c89 | 343 | static struct ip6_tnl *ip6_tnl_locate(struct net *net, |
c12b395a | 344 | struct __ip6_tnl_parm *p, int create) |
1da177e4 | 345 | { |
b71d1d42 ED |
346 | const struct in6_addr *remote = &p->raddr; |
347 | const struct in6_addr *local = &p->laddr; | |
94767632 | 348 | struct ip6_tnl __rcu **tp; |
1da177e4 | 349 | struct ip6_tnl *t; |
2dd02c89 | 350 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 351 | |
94767632 ED |
352 | for (tp = ip6_tnl_bucket(ip6n, p); |
353 | (t = rtnl_dereference(*tp)) != NULL; | |
354 | tp = &t->next) { | |
1da177e4 | 355 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
567131a7 VN |
356 | ipv6_addr_equal(remote, &t->parms.raddr)) |
357 | return t; | |
1da177e4 LT |
358 | } |
359 | if (!create) | |
567131a7 | 360 | return NULL; |
2dd02c89 | 361 | return ip6_tnl_create(net, p); |
1da177e4 LT |
362 | } |
363 | ||
364 | /** | |
3144581c | 365 | * ip6_tnl_dev_uninit - tunnel device uninitializer |
1da177e4 | 366 | * @dev: the device to be destroyed |
1ab1457c | 367 | * |
1da177e4 | 368 | * Description: |
3144581c | 369 | * ip6_tnl_dev_uninit() removes tunnel from its list |
1da177e4 LT |
370 | **/ |
371 | ||
372 | static void | |
3144581c | 373 | ip6_tnl_dev_uninit(struct net_device *dev) |
1da177e4 | 374 | { |
2941a486 | 375 | struct ip6_tnl *t = netdev_priv(dev); |
2dd02c89 PE |
376 | struct net *net = dev_net(dev); |
377 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1da177e4 | 378 | |
94767632 | 379 | if (dev == ip6n->fb_tnl_dev) |
a9b3cd7f | 380 | RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL); |
94767632 | 381 | else |
2dd02c89 | 382 | ip6_tnl_unlink(ip6n, t); |
1da177e4 LT |
383 | ip6_tnl_dst_reset(t); |
384 | dev_put(dev); | |
385 | } | |
386 | ||
387 | /** | |
388 | * parse_tvl_tnl_enc_lim - handle encapsulation limit option | |
389 | * @skb: received socket buffer | |
390 | * | |
1ab1457c YH |
391 | * Return: |
392 | * 0 if none was found, | |
1da177e4 LT |
393 | * else index to encapsulation limit |
394 | **/ | |
395 | ||
c12b395a | 396 | __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw) |
1da177e4 | 397 | { |
b71d1d42 | 398 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw; |
1da177e4 LT |
399 | __u8 nexthdr = ipv6h->nexthdr; |
400 | __u16 off = sizeof (*ipv6h); | |
401 | ||
402 | while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { | |
403 | __u16 optlen = 0; | |
404 | struct ipv6_opt_hdr *hdr; | |
405 | if (raw + off + sizeof (*hdr) > skb->data && | |
406 | !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr))) | |
407 | break; | |
408 | ||
409 | hdr = (struct ipv6_opt_hdr *) (raw + off); | |
410 | if (nexthdr == NEXTHDR_FRAGMENT) { | |
411 | struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; | |
412 | if (frag_hdr->frag_off) | |
413 | break; | |
414 | optlen = 8; | |
415 | } else if (nexthdr == NEXTHDR_AUTH) { | |
416 | optlen = (hdr->hdrlen + 2) << 2; | |
417 | } else { | |
418 | optlen = ipv6_optlen(hdr); | |
419 | } | |
420 | if (nexthdr == NEXTHDR_DEST) { | |
421 | __u16 i = off + 2; | |
422 | while (1) { | |
423 | struct ipv6_tlv_tnl_enc_lim *tel; | |
424 | ||
425 | /* No more room for encapsulation limit */ | |
426 | if (i + sizeof (*tel) > off + optlen) | |
427 | break; | |
428 | ||
429 | tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i]; | |
430 | /* return index of option if found and valid */ | |
431 | if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && | |
432 | tel->length == 1) | |
433 | return i; | |
434 | /* else jump to next option */ | |
435 | if (tel->type) | |
436 | i += tel->length + 2; | |
437 | else | |
438 | i++; | |
439 | } | |
440 | } | |
441 | nexthdr = hdr->nexthdr; | |
442 | off += optlen; | |
443 | } | |
444 | return 0; | |
445 | } | |
c12b395a | 446 | EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim); |
1da177e4 LT |
447 | |
448 | /** | |
e490d1d8 | 449 | * ip6_tnl_err - tunnel error handler |
1da177e4 LT |
450 | * |
451 | * Description: | |
e490d1d8 | 452 | * ip6_tnl_err() should handle errors in the tunnel according |
1da177e4 LT |
453 | * to the specifications in RFC 2473. |
454 | **/ | |
455 | ||
d2acc347 | 456 | static int |
502b0935 | 457 | ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, |
d5fdd6ba | 458 | u8 *type, u8 *code, int *msg, __u32 *info, int offset) |
1da177e4 | 459 | { |
b71d1d42 | 460 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data; |
1da177e4 LT |
461 | struct ip6_tnl *t; |
462 | int rel_msg = 0; | |
d5fdd6ba BH |
463 | u8 rel_type = ICMPV6_DEST_UNREACH; |
464 | u8 rel_code = ICMPV6_ADDR_UNREACH; | |
1da177e4 LT |
465 | __u32 rel_info = 0; |
466 | __u16 len; | |
d2acc347 | 467 | int err = -ENOENT; |
1da177e4 | 468 | |
1ab1457c YH |
469 | /* If the packet doesn't contain the original IPv6 header we are |
470 | in trouble since we might need the source address for further | |
1da177e4 LT |
471 | processing of the error. */ |
472 | ||
2922bc8a | 473 | rcu_read_lock(); |
8704ca7e | 474 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, |
2dd02c89 | 475 | &ipv6h->saddr)) == NULL) |
1da177e4 LT |
476 | goto out; |
477 | ||
502b0935 YK |
478 | if (t->parms.proto != ipproto && t->parms.proto != 0) |
479 | goto out; | |
480 | ||
d2acc347 HX |
481 | err = 0; |
482 | ||
e490d1d8 | 483 | switch (*type) { |
1da177e4 LT |
484 | __u32 teli; |
485 | struct ipv6_tlv_tnl_enc_lim *tel; | |
486 | __u32 mtu; | |
487 | case ICMPV6_DEST_UNREACH: | |
e87cc472 JP |
488 | net_warn_ratelimited("%s: Path to destination invalid or inactive!\n", |
489 | t->parms.name); | |
1da177e4 LT |
490 | rel_msg = 1; |
491 | break; | |
492 | case ICMPV6_TIME_EXCEED: | |
e490d1d8 | 493 | if ((*code) == ICMPV6_EXC_HOPLIMIT) { |
e87cc472 JP |
494 | net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", |
495 | t->parms.name); | |
1da177e4 LT |
496 | rel_msg = 1; |
497 | } | |
498 | break; | |
499 | case ICMPV6_PARAMPROB: | |
107a5fe6 | 500 | teli = 0; |
e490d1d8 | 501 | if ((*code) == ICMPV6_HDR_FIELD) |
c12b395a | 502 | teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); |
1da177e4 | 503 | |
704eae1f | 504 | if (teli && teli == *info - 2) { |
1da177e4 LT |
505 | tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; |
506 | if (tel->encap_limit == 0) { | |
e87cc472 JP |
507 | net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", |
508 | t->parms.name); | |
1da177e4 LT |
509 | rel_msg = 1; |
510 | } | |
e87cc472 JP |
511 | } else { |
512 | net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n", | |
513 | t->parms.name); | |
1da177e4 LT |
514 | } |
515 | break; | |
516 | case ICMPV6_PKT_TOOBIG: | |
704eae1f | 517 | mtu = *info - offset; |
1da177e4 LT |
518 | if (mtu < IPV6_MIN_MTU) |
519 | mtu = IPV6_MIN_MTU; | |
520 | t->dev->mtu = mtu; | |
521 | ||
cc6cdac0 | 522 | if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) { |
1da177e4 LT |
523 | rel_type = ICMPV6_PKT_TOOBIG; |
524 | rel_code = 0; | |
525 | rel_info = mtu; | |
526 | rel_msg = 1; | |
527 | } | |
528 | break; | |
529 | } | |
e490d1d8 YK |
530 | |
531 | *type = rel_type; | |
532 | *code = rel_code; | |
533 | *info = rel_info; | |
534 | *msg = rel_msg; | |
535 | ||
536 | out: | |
2922bc8a | 537 | rcu_read_unlock(); |
e490d1d8 YK |
538 | return err; |
539 | } | |
540 | ||
c4d3efaf YK |
541 | static int |
542 | ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 543 | u8 type, u8 code, int offset, __be32 info) |
c4d3efaf YK |
544 | { |
545 | int rel_msg = 0; | |
d5fdd6ba BH |
546 | u8 rel_type = type; |
547 | u8 rel_code = code; | |
704eae1f | 548 | __u32 rel_info = ntohl(info); |
c4d3efaf YK |
549 | int err; |
550 | struct sk_buff *skb2; | |
b71d1d42 | 551 | const struct iphdr *eiph; |
c4d3efaf | 552 | struct rtable *rt; |
31e4543d | 553 | struct flowi4 fl4; |
c4d3efaf | 554 | |
502b0935 YK |
555 | err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, |
556 | &rel_msg, &rel_info, offset); | |
c4d3efaf YK |
557 | if (err < 0) |
558 | return err; | |
559 | ||
560 | if (rel_msg == 0) | |
561 | return 0; | |
562 | ||
563 | switch (rel_type) { | |
564 | case ICMPV6_DEST_UNREACH: | |
565 | if (rel_code != ICMPV6_ADDR_UNREACH) | |
566 | return 0; | |
567 | rel_type = ICMP_DEST_UNREACH; | |
568 | rel_code = ICMP_HOST_UNREACH; | |
569 | break; | |
570 | case ICMPV6_PKT_TOOBIG: | |
571 | if (rel_code != 0) | |
572 | return 0; | |
573 | rel_type = ICMP_DEST_UNREACH; | |
574 | rel_code = ICMP_FRAG_NEEDED; | |
575 | break; | |
ec18d9a2 DM |
576 | case NDISC_REDIRECT: |
577 | rel_type = ICMP_REDIRECT; | |
578 | rel_code = ICMP_REDIR_HOST; | |
c4d3efaf YK |
579 | default: |
580 | return 0; | |
581 | } | |
582 | ||
583 | if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) | |
584 | return 0; | |
585 | ||
586 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
587 | if (!skb2) | |
588 | return 0; | |
589 | ||
adf30907 ED |
590 | skb_dst_drop(skb2); |
591 | ||
c4d3efaf | 592 | skb_pull(skb2, offset); |
c1d2bbe1 | 593 | skb_reset_network_header(skb2); |
eddc9ec5 | 594 | eiph = ip_hdr(skb2); |
c4d3efaf YK |
595 | |
596 | /* Try to guess incoming interface */ | |
31e4543d | 597 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, |
78fbfd8a DM |
598 | eiph->saddr, 0, |
599 | 0, 0, | |
600 | IPPROTO_IPIP, RT_TOS(eiph->tos), 0); | |
b23dd4fe | 601 | if (IS_ERR(rt)) |
c4d3efaf YK |
602 | goto out; |
603 | ||
d8d1f30b | 604 | skb2->dev = rt->dst.dev; |
c4d3efaf YK |
605 | |
606 | /* route "incoming" packet */ | |
607 | if (rt->rt_flags & RTCF_LOCAL) { | |
608 | ip_rt_put(rt); | |
609 | rt = NULL; | |
31e4543d | 610 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, |
78fbfd8a DM |
611 | eiph->daddr, eiph->saddr, |
612 | 0, 0, | |
613 | IPPROTO_IPIP, | |
614 | RT_TOS(eiph->tos), 0); | |
b23dd4fe | 615 | if (IS_ERR(rt) || |
d8d1f30b | 616 | rt->dst.dev->type != ARPHRD_TUNNEL) { |
b23dd4fe DM |
617 | if (!IS_ERR(rt)) |
618 | ip_rt_put(rt); | |
c4d3efaf YK |
619 | goto out; |
620 | } | |
b23dd4fe | 621 | skb_dst_set(skb2, &rt->dst); |
c4d3efaf YK |
622 | } else { |
623 | ip_rt_put(rt); | |
624 | if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, | |
625 | skb2->dev) || | |
adf30907 | 626 | skb_dst(skb2)->dev->type != ARPHRD_TUNNEL) |
c4d3efaf YK |
627 | goto out; |
628 | } | |
629 | ||
630 | /* change mtu on this route */ | |
631 | if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { | |
adf30907 | 632 | if (rel_info > dst_mtu(skb_dst(skb2))) |
c4d3efaf YK |
633 | goto out; |
634 | ||
6700c270 | 635 | skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2, rel_info); |
c4d3efaf | 636 | } |
1ed5c48f | 637 | if (rel_type == ICMP_REDIRECT) |
6700c270 | 638 | skb_dst(skb2)->ops->redirect(skb_dst(skb2), NULL, skb2); |
c4d3efaf | 639 | |
704eae1f | 640 | icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); |
c4d3efaf YK |
641 | |
642 | out: | |
643 | kfree_skb(skb2); | |
644 | return 0; | |
645 | } | |
646 | ||
e490d1d8 YK |
647 | static int |
648 | ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 649 | u8 type, u8 code, int offset, __be32 info) |
e490d1d8 YK |
650 | { |
651 | int rel_msg = 0; | |
d5fdd6ba BH |
652 | u8 rel_type = type; |
653 | u8 rel_code = code; | |
704eae1f | 654 | __u32 rel_info = ntohl(info); |
e490d1d8 YK |
655 | int err; |
656 | ||
502b0935 YK |
657 | err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, |
658 | &rel_msg, &rel_info, offset); | |
e490d1d8 YK |
659 | if (err < 0) |
660 | return err; | |
661 | ||
662 | if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { | |
1da177e4 LT |
663 | struct rt6_info *rt; |
664 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
305d4b3c | 665 | |
1da177e4 | 666 | if (!skb2) |
e490d1d8 | 667 | return 0; |
1da177e4 | 668 | |
adf30907 | 669 | skb_dst_drop(skb2); |
1da177e4 | 670 | skb_pull(skb2, offset); |
c1d2bbe1 | 671 | skb_reset_network_header(skb2); |
1da177e4 LT |
672 | |
673 | /* Try to guess incoming interface */ | |
2f7f54b7 PE |
674 | rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, |
675 | NULL, 0, 0); | |
1da177e4 | 676 | |
d1918542 DM |
677 | if (rt && rt->dst.dev) |
678 | skb2->dev = rt->dst.dev; | |
1da177e4 | 679 | |
3ffe533c | 680 | icmpv6_send(skb2, rel_type, rel_code, rel_info); |
1da177e4 | 681 | |
94e187c0 | 682 | ip6_rt_put(rt); |
1da177e4 LT |
683 | |
684 | kfree_skb(skb2); | |
685 | } | |
e490d1d8 YK |
686 | |
687 | return 0; | |
1da177e4 LT |
688 | } |
689 | ||
f4e0b4c5 ND |
690 | static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
691 | const struct ipv6hdr *ipv6h, | |
692 | struct sk_buff *skb) | |
c4d3efaf YK |
693 | { |
694 | __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; | |
695 | ||
696 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) | |
eddc9ec5 | 697 | ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); |
c4d3efaf | 698 | |
f4e0b4c5 | 699 | return IP6_ECN_decapsulate(ipv6h, skb); |
c4d3efaf YK |
700 | } |
701 | ||
f4e0b4c5 ND |
702 | static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
703 | const struct ipv6hdr *ipv6h, | |
704 | struct sk_buff *skb) | |
1da177e4 | 705 | { |
8359925b | 706 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) |
29bb43b4 | 707 | ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); |
1da177e4 | 708 | |
f4e0b4c5 | 709 | return IP6_ECN_decapsulate(ipv6h, skb); |
1da177e4 | 710 | } |
8359925b | 711 | |
c12b395a | 712 | __u32 ip6_tnl_get_cap(struct ip6_tnl *t, |
d0087b29 VN |
713 | const struct in6_addr *laddr, |
714 | const struct in6_addr *raddr) | |
715 | { | |
c12b395a | 716 | struct __ip6_tnl_parm *p = &t->parms; |
d0087b29 VN |
717 | int ltype = ipv6_addr_type(laddr); |
718 | int rtype = ipv6_addr_type(raddr); | |
719 | __u32 flags = 0; | |
720 | ||
721 | if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) { | |
722 | flags = IP6_TNL_F_CAP_PER_PACKET; | |
723 | } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
724 | rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
725 | !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && | |
726 | (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { | |
727 | if (ltype&IPV6_ADDR_UNICAST) | |
728 | flags |= IP6_TNL_F_CAP_XMIT; | |
729 | if (rtype&IPV6_ADDR_UNICAST) | |
730 | flags |= IP6_TNL_F_CAP_RCV; | |
731 | } | |
732 | return flags; | |
733 | } | |
c12b395a | 734 | EXPORT_SYMBOL(ip6_tnl_get_cap); |
d0087b29 | 735 | |
f1a28eab | 736 | /* called with rcu_read_lock() */ |
c12b395a | 737 | int ip6_tnl_rcv_ctl(struct ip6_tnl *t, |
d0087b29 VN |
738 | const struct in6_addr *laddr, |
739 | const struct in6_addr *raddr) | |
09c6bbf0 | 740 | { |
c12b395a | 741 | struct __ip6_tnl_parm *p = &t->parms; |
09c6bbf0 | 742 | int ret = 0; |
2f7f54b7 | 743 | struct net *net = dev_net(t->dev); |
09c6bbf0 | 744 | |
d0087b29 VN |
745 | if ((p->flags & IP6_TNL_F_CAP_RCV) || |
746 | ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && | |
747 | (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) { | |
1ab1457c | 748 | struct net_device *ldev = NULL; |
09c6bbf0 VN |
749 | |
750 | if (p->link) | |
f1a28eab | 751 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 752 | |
d0087b29 VN |
753 | if ((ipv6_addr_is_multicast(laddr) || |
754 | likely(ipv6_chk_addr(net, laddr, ldev, 0))) && | |
755 | likely(!ipv6_chk_addr(net, raddr, NULL, 0))) | |
09c6bbf0 | 756 | ret = 1; |
09c6bbf0 VN |
757 | } |
758 | return ret; | |
759 | } | |
c12b395a | 760 | EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl); |
1da177e4 LT |
761 | |
762 | /** | |
3144581c | 763 | * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally |
1da177e4 | 764 | * @skb: received socket buffer |
8359925b YK |
765 | * @protocol: ethernet protocol ID |
766 | * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN | |
1da177e4 LT |
767 | * |
768 | * Return: 0 | |
769 | **/ | |
770 | ||
8359925b | 771 | static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol, |
502b0935 | 772 | __u8 ipproto, |
f4e0b4c5 ND |
773 | int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, |
774 | const struct ipv6hdr *ipv6h, | |
775 | struct sk_buff *skb)) | |
1da177e4 | 776 | { |
1da177e4 | 777 | struct ip6_tnl *t; |
b71d1d42 | 778 | const struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
f4e0b4c5 | 779 | int err; |
1da177e4 | 780 | |
2922bc8a | 781 | rcu_read_lock(); |
1da177e4 | 782 | |
8704ca7e | 783 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, |
2dd02c89 | 784 | &ipv6h->daddr)) != NULL) { |
8560f226 ED |
785 | struct pcpu_tstats *tstats; |
786 | ||
502b0935 | 787 | if (t->parms.proto != ipproto && t->parms.proto != 0) { |
2922bc8a | 788 | rcu_read_unlock(); |
502b0935 YK |
789 | goto discard; |
790 | } | |
791 | ||
1da177e4 | 792 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
2922bc8a | 793 | rcu_read_unlock(); |
50fba2aa | 794 | goto discard; |
1da177e4 LT |
795 | } |
796 | ||
d0087b29 | 797 | if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) { |
3dca02af | 798 | t->dev->stats.rx_dropped++; |
2922bc8a | 799 | rcu_read_unlock(); |
1da177e4 LT |
800 | goto discard; |
801 | } | |
802 | secpath_reset(skb); | |
b0e380b1 | 803 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 804 | skb_reset_network_header(skb); |
8359925b | 805 | skb->protocol = htons(protocol); |
1da177e4 LT |
806 | skb->pkt_type = PACKET_HOST; |
807 | memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); | |
8359925b | 808 | |
f4e0b4c5 ND |
809 | __skb_tunnel_rx(skb, t->dev); |
810 | ||
811 | err = dscp_ecn_decapsulate(t, ipv6h, skb); | |
812 | if (unlikely(err)) { | |
813 | if (log_ecn_error) | |
814 | net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n", | |
815 | &ipv6h->saddr, | |
816 | ipv6_get_dsfield(ipv6h)); | |
817 | if (err > 1) { | |
818 | ++t->dev->stats.rx_frame_errors; | |
819 | ++t->dev->stats.rx_errors; | |
820 | rcu_read_unlock(); | |
821 | goto discard; | |
822 | } | |
823 | } | |
824 | ||
8560f226 ED |
825 | tstats = this_cpu_ptr(t->dev->tstats); |
826 | tstats->rx_packets++; | |
827 | tstats->rx_bytes += skb->len; | |
828 | ||
caf586e5 | 829 | netif_rx(skb); |
8990f468 | 830 | |
2922bc8a | 831 | rcu_read_unlock(); |
1da177e4 LT |
832 | return 0; |
833 | } | |
2922bc8a | 834 | rcu_read_unlock(); |
1da177e4 | 835 | return 1; |
50fba2aa HX |
836 | |
837 | discard: | |
838 | kfree_skb(skb); | |
839 | return 0; | |
1da177e4 LT |
840 | } |
841 | ||
c4d3efaf YK |
842 | static int ip4ip6_rcv(struct sk_buff *skb) |
843 | { | |
502b0935 YK |
844 | return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP, |
845 | ip4ip6_dscp_ecn_decapsulate); | |
c4d3efaf YK |
846 | } |
847 | ||
8359925b YK |
848 | static int ip6ip6_rcv(struct sk_buff *skb) |
849 | { | |
502b0935 YK |
850 | return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6, |
851 | ip6ip6_dscp_ecn_decapsulate); | |
8359925b YK |
852 | } |
853 | ||
6fb32dde VN |
854 | struct ipv6_tel_txoption { |
855 | struct ipv6_txoptions ops; | |
856 | __u8 dst_opt[8]; | |
857 | }; | |
1da177e4 | 858 | |
6fb32dde VN |
859 | static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) |
860 | { | |
861 | memset(opt, 0, sizeof(struct ipv6_tel_txoption)); | |
1da177e4 | 862 | |
6fb32dde VN |
863 | opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; |
864 | opt->dst_opt[3] = 1; | |
865 | opt->dst_opt[4] = encap_limit; | |
866 | opt->dst_opt[5] = IPV6_TLV_PADN; | |
867 | opt->dst_opt[6] = 1; | |
1da177e4 | 868 | |
6fb32dde VN |
869 | opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; |
870 | opt->ops.opt_nflen = 8; | |
1da177e4 LT |
871 | } |
872 | ||
873 | /** | |
3144581c | 874 | * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own |
1da177e4 | 875 | * @t: the outgoing tunnel device |
1ab1457c | 876 | * @hdr: IPv6 header from the incoming packet |
1da177e4 LT |
877 | * |
878 | * Description: | |
1ab1457c | 879 | * Avoid trivial tunneling loop by checking that tunnel exit-point |
1da177e4 LT |
880 | * doesn't match source of incoming packet. |
881 | * | |
1ab1457c | 882 | * Return: |
1da177e4 LT |
883 | * 1 if conflict, |
884 | * 0 else | |
885 | **/ | |
886 | ||
92113bfd | 887 | static inline bool |
b71d1d42 | 888 | ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) |
1da177e4 LT |
889 | { |
890 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
891 | } | |
892 | ||
c12b395a | 893 | int ip6_tnl_xmit_ctl(struct ip6_tnl *t) |
09c6bbf0 | 894 | { |
c12b395a | 895 | struct __ip6_tnl_parm *p = &t->parms; |
09c6bbf0 | 896 | int ret = 0; |
2f7f54b7 | 897 | struct net *net = dev_net(t->dev); |
09c6bbf0 | 898 | |
1ab1457c | 899 | if (p->flags & IP6_TNL_F_CAP_XMIT) { |
09c6bbf0 VN |
900 | struct net_device *ldev = NULL; |
901 | ||
f1a28eab | 902 | rcu_read_lock(); |
09c6bbf0 | 903 | if (p->link) |
f1a28eab | 904 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 905 | |
2f7f54b7 | 906 | if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0))) |
f3213831 JP |
907 | pr_warn("%s xmit: Local address not yet configured!\n", |
908 | p->name); | |
09c6bbf0 | 909 | else if (!ipv6_addr_is_multicast(&p->raddr) && |
2f7f54b7 | 910 | unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0))) |
f3213831 JP |
911 | pr_warn("%s xmit: Routing loop! Remote address found on this node!\n", |
912 | p->name); | |
09c6bbf0 VN |
913 | else |
914 | ret = 1; | |
f1a28eab | 915 | rcu_read_unlock(); |
09c6bbf0 VN |
916 | } |
917 | return ret; | |
918 | } | |
c12b395a | 919 | EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl); |
920 | ||
1da177e4 | 921 | /** |
61ec2aec | 922 | * ip6_tnl_xmit2 - encapsulate packet and send |
1da177e4 | 923 | * @skb: the outgoing socket buffer |
1ab1457c | 924 | * @dev: the outgoing tunnel device |
61ec2aec YK |
925 | * @dsfield: dscp code for outer header |
926 | * @fl: flow of tunneled packet | |
927 | * @encap_limit: encapsulation limit | |
928 | * @pmtu: Path MTU is stored if packet is too big | |
1da177e4 LT |
929 | * |
930 | * Description: | |
931 | * Build new header and do some sanity checks on the packet before sending | |
932 | * it. | |
933 | * | |
1ab1457c | 934 | * Return: |
c4d3efaf | 935 | * 0 on success |
61ec2aec YK |
936 | * -1 fail |
937 | * %-EMSGSIZE message too big. return mtu in this case. | |
1da177e4 LT |
938 | **/ |
939 | ||
61ec2aec YK |
940 | static int ip6_tnl_xmit2(struct sk_buff *skb, |
941 | struct net_device *dev, | |
942 | __u8 dsfield, | |
4c9483b2 | 943 | struct flowi6 *fl6, |
61ec2aec YK |
944 | int encap_limit, |
945 | __u32 *pmtu) | |
1da177e4 | 946 | { |
52479b62 | 947 | struct net *net = dev_net(dev); |
2941a486 | 948 | struct ip6_tnl *t = netdev_priv(dev); |
3dca02af | 949 | struct net_device_stats *stats = &t->dev->stats; |
0660e03f | 950 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
6fb32dde | 951 | struct ipv6_tel_txoption opt; |
d24f22f3 | 952 | struct dst_entry *dst = NULL, *ndst = NULL; |
1da177e4 LT |
953 | struct net_device *tdev; |
954 | int mtu; | |
c2636b4d | 955 | unsigned int max_headroom = sizeof(struct ipv6hdr); |
1da177e4 | 956 | u8 proto; |
61ec2aec | 957 | int err = -1; |
1da177e4 | 958 | int pkt_len; |
1da177e4 | 959 | |
d24f22f3 ED |
960 | if (!fl6->flowi6_mark) |
961 | dst = ip6_tnl_dst_check(t); | |
89b02126 ED |
962 | if (!dst) { |
963 | ndst = ip6_route_output(net, NULL, fl6); | |
1da177e4 | 964 | |
89b02126 | 965 | if (ndst->error) |
a57ebc90 | 966 | goto tx_err_link_failure; |
89b02126 ED |
967 | ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0); |
968 | if (IS_ERR(ndst)) { | |
969 | err = PTR_ERR(ndst); | |
970 | ndst = NULL; | |
452edd59 DM |
971 | goto tx_err_link_failure; |
972 | } | |
89b02126 | 973 | dst = ndst; |
a57ebc90 | 974 | } |
1da177e4 LT |
975 | |
976 | tdev = dst->dev; | |
977 | ||
978 | if (tdev == dev) { | |
979 | stats->collisions++; | |
e87cc472 JP |
980 | net_warn_ratelimited("%s: Local routing loop detected!\n", |
981 | t->parms.name); | |
1da177e4 LT |
982 | goto tx_err_dst_release; |
983 | } | |
984 | mtu = dst_mtu(dst) - sizeof (*ipv6h); | |
6fb32dde | 985 | if (encap_limit >= 0) { |
1da177e4 LT |
986 | max_headroom += 8; |
987 | mtu -= 8; | |
988 | } | |
989 | if (mtu < IPV6_MIN_MTU) | |
990 | mtu = IPV6_MIN_MTU; | |
adf30907 | 991 | if (skb_dst(skb)) |
6700c270 | 992 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); |
1da177e4 | 993 | if (skb->len > mtu) { |
61ec2aec YK |
994 | *pmtu = mtu; |
995 | err = -EMSGSIZE; | |
1da177e4 LT |
996 | goto tx_err_dst_release; |
997 | } | |
998 | ||
999 | /* | |
1000 | * Okay, now see if we can stuff it in the buffer as-is. | |
1001 | */ | |
1002 | max_headroom += LL_RESERVED_SPACE(tdev); | |
1ab1457c | 1003 | |
cfbba49d PM |
1004 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
1005 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 | 1006 | struct sk_buff *new_skb; |
1ab1457c | 1007 | |
1da177e4 LT |
1008 | if (!(new_skb = skb_realloc_headroom(skb, max_headroom))) |
1009 | goto tx_err_dst_release; | |
1010 | ||
1011 | if (skb->sk) | |
1012 | skb_set_owner_w(new_skb, skb->sk); | |
9ff26449 | 1013 | consume_skb(skb); |
1da177e4 LT |
1014 | skb = new_skb; |
1015 | } | |
adf30907 | 1016 | skb_dst_drop(skb); |
d24f22f3 ED |
1017 | if (fl6->flowi6_mark) { |
1018 | skb_dst_set(skb, dst); | |
1019 | ndst = NULL; | |
1020 | } else { | |
1021 | skb_dst_set_noref(skb, dst); | |
1022 | } | |
b0e380b1 | 1023 | skb->transport_header = skb->network_header; |
1da177e4 | 1024 | |
4c9483b2 | 1025 | proto = fl6->flowi6_proto; |
6fb32dde VN |
1026 | if (encap_limit >= 0) { |
1027 | init_tel_txopt(&opt, encap_limit); | |
1028 | ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); | |
1029 | } | |
e2d1bca7 ACM |
1030 | skb_push(skb, sizeof(struct ipv6hdr)); |
1031 | skb_reset_network_header(skb); | |
0660e03f | 1032 | ipv6h = ipv6_hdr(skb); |
3e4e4c1f | 1033 | ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), fl6->flowlabel); |
1da177e4 LT |
1034 | ipv6h->hop_limit = t->parms.hop_limit; |
1035 | ipv6h->nexthdr = proto; | |
4e3fd7a0 AD |
1036 | ipv6h->saddr = fl6->saddr; |
1037 | ipv6h->daddr = fl6->daddr; | |
1da177e4 LT |
1038 | nf_reset(skb); |
1039 | pkt_len = skb->len; | |
ef76bc23 | 1040 | err = ip6_local_out(skb); |
1da177e4 | 1041 | |
b9df3cb8 | 1042 | if (net_xmit_eval(err) == 0) { |
8560f226 ED |
1043 | struct pcpu_tstats *tstats = this_cpu_ptr(t->dev->tstats); |
1044 | ||
1045 | tstats->tx_bytes += pkt_len; | |
1046 | tstats->tx_packets++; | |
1da177e4 LT |
1047 | } else { |
1048 | stats->tx_errors++; | |
1049 | stats->tx_aborted_errors++; | |
1050 | } | |
89b02126 ED |
1051 | if (ndst) |
1052 | ip6_tnl_dst_store(t, ndst); | |
1da177e4 LT |
1053 | return 0; |
1054 | tx_err_link_failure: | |
1055 | stats->tx_carrier_errors++; | |
1056 | dst_link_failure(skb); | |
1057 | tx_err_dst_release: | |
89b02126 | 1058 | dst_release(ndst); |
61ec2aec YK |
1059 | return err; |
1060 | } | |
1061 | ||
c4d3efaf YK |
1062 | static inline int |
1063 | ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1064 | { | |
1065 | struct ip6_tnl *t = netdev_priv(dev); | |
b71d1d42 | 1066 | const struct iphdr *iph = ip_hdr(skb); |
c4d3efaf | 1067 | int encap_limit = -1; |
4c9483b2 | 1068 | struct flowi6 fl6; |
c4d3efaf YK |
1069 | __u8 dsfield; |
1070 | __u32 mtu; | |
1071 | int err; | |
1072 | ||
502b0935 YK |
1073 | if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) || |
1074 | !ip6_tnl_xmit_ctl(t)) | |
c4d3efaf YK |
1075 | return -1; |
1076 | ||
1077 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1078 | encap_limit = t->parms.encap_limit; | |
1079 | ||
4c9483b2 DM |
1080 | memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6)); |
1081 | fl6.flowi6_proto = IPPROTO_IPIP; | |
c4d3efaf YK |
1082 | |
1083 | dsfield = ipv4_get_dsfield(iph); | |
1084 | ||
d24f22f3 | 1085 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
4c9483b2 | 1086 | fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) |
b77f2fa6 | 1087 | & IPV6_TCLASS_MASK; |
d24f22f3 ED |
1088 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
1089 | fl6.flowi6_mark = skb->mark; | |
c4d3efaf | 1090 | |
4c9483b2 | 1091 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); |
c4d3efaf YK |
1092 | if (err != 0) { |
1093 | /* XXX: send ICMP error even if DF is not set. */ | |
1094 | if (err == -EMSGSIZE) | |
1095 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
1096 | htonl(mtu)); | |
1097 | return -1; | |
1098 | } | |
1099 | ||
1100 | return 0; | |
1101 | } | |
1102 | ||
61ec2aec YK |
1103 | static inline int |
1104 | ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1105 | { | |
1106 | struct ip6_tnl *t = netdev_priv(dev); | |
0660e03f | 1107 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
61ec2aec YK |
1108 | int encap_limit = -1; |
1109 | __u16 offset; | |
4c9483b2 | 1110 | struct flowi6 fl6; |
61ec2aec YK |
1111 | __u8 dsfield; |
1112 | __u32 mtu; | |
1113 | int err; | |
1114 | ||
502b0935 YK |
1115 | if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) || |
1116 | !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h)) | |
61ec2aec YK |
1117 | return -1; |
1118 | ||
c12b395a | 1119 | offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); |
d56f90a7 | 1120 | if (offset > 0) { |
61ec2aec | 1121 | struct ipv6_tlv_tnl_enc_lim *tel; |
d56f90a7 | 1122 | tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; |
61ec2aec YK |
1123 | if (tel->encap_limit == 0) { |
1124 | icmpv6_send(skb, ICMPV6_PARAMPROB, | |
3ffe533c | 1125 | ICMPV6_HDR_FIELD, offset + 2); |
61ec2aec YK |
1126 | return -1; |
1127 | } | |
1128 | encap_limit = tel->encap_limit - 1; | |
1129 | } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1130 | encap_limit = t->parms.encap_limit; | |
1131 | ||
4c9483b2 DM |
1132 | memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6)); |
1133 | fl6.flowi6_proto = IPPROTO_IPV6; | |
61ec2aec YK |
1134 | |
1135 | dsfield = ipv6_get_dsfield(ipv6h); | |
d24f22f3 | 1136 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
4c9483b2 | 1137 | fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); |
d24f22f3 | 1138 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) |
4c9483b2 | 1139 | fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK); |
d24f22f3 ED |
1140 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
1141 | fl6.flowi6_mark = skb->mark; | |
61ec2aec | 1142 | |
4c9483b2 | 1143 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); |
61ec2aec YK |
1144 | if (err != 0) { |
1145 | if (err == -EMSGSIZE) | |
3ffe533c | 1146 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
61ec2aec YK |
1147 | return -1; |
1148 | } | |
1149 | ||
1150 | return 0; | |
1151 | } | |
1152 | ||
6fef4c0c | 1153 | static netdev_tx_t |
61ec2aec YK |
1154 | ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) |
1155 | { | |
1156 | struct ip6_tnl *t = netdev_priv(dev); | |
3dca02af | 1157 | struct net_device_stats *stats = &t->dev->stats; |
61ec2aec YK |
1158 | int ret; |
1159 | ||
61ec2aec | 1160 | switch (skb->protocol) { |
60678040 | 1161 | case htons(ETH_P_IP): |
c4d3efaf YK |
1162 | ret = ip4ip6_tnl_xmit(skb, dev); |
1163 | break; | |
60678040 | 1164 | case htons(ETH_P_IPV6): |
61ec2aec YK |
1165 | ret = ip6ip6_tnl_xmit(skb, dev); |
1166 | break; | |
1167 | default: | |
1168 | goto tx_err; | |
1169 | } | |
1170 | ||
1171 | if (ret < 0) | |
1172 | goto tx_err; | |
1173 | ||
6ed10654 | 1174 | return NETDEV_TX_OK; |
61ec2aec | 1175 | |
1da177e4 LT |
1176 | tx_err: |
1177 | stats->tx_errors++; | |
1178 | stats->tx_dropped++; | |
1179 | kfree_skb(skb); | |
6ed10654 | 1180 | return NETDEV_TX_OK; |
1da177e4 LT |
1181 | } |
1182 | ||
3144581c | 1183 | static void ip6_tnl_link_config(struct ip6_tnl *t) |
1da177e4 LT |
1184 | { |
1185 | struct net_device *dev = t->dev; | |
c12b395a | 1186 | struct __ip6_tnl_parm *p = &t->parms; |
4c9483b2 | 1187 | struct flowi6 *fl6 = &t->fl.u.ip6; |
1da177e4 | 1188 | |
3a6d54c5 JP |
1189 | memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); |
1190 | memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
1da177e4 LT |
1191 | |
1192 | /* Set up flowi template */ | |
4e3fd7a0 AD |
1193 | fl6->saddr = p->laddr; |
1194 | fl6->daddr = p->raddr; | |
4c9483b2 DM |
1195 | fl6->flowi6_oif = p->link; |
1196 | fl6->flowlabel = 0; | |
1da177e4 LT |
1197 | |
1198 | if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) | |
4c9483b2 | 1199 | fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; |
1da177e4 | 1200 | if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) |
4c9483b2 | 1201 | fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; |
1da177e4 | 1202 | |
d0087b29 VN |
1203 | p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); |
1204 | p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); | |
1da177e4 LT |
1205 | |
1206 | if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) | |
1207 | dev->flags |= IFF_POINTOPOINT; | |
1208 | else | |
1209 | dev->flags &= ~IFF_POINTOPOINT; | |
1210 | ||
1211 | dev->iflink = p->link; | |
1212 | ||
1213 | if (p->flags & IP6_TNL_F_CAP_XMIT) { | |
305d4b3c VN |
1214 | int strict = (ipv6_addr_type(&p->raddr) & |
1215 | (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); | |
1216 | ||
2f7f54b7 PE |
1217 | struct rt6_info *rt = rt6_lookup(dev_net(dev), |
1218 | &p->raddr, &p->laddr, | |
305d4b3c | 1219 | p->link, strict); |
1da177e4 LT |
1220 | |
1221 | if (rt == NULL) | |
1222 | return; | |
1223 | ||
d1918542 DM |
1224 | if (rt->dst.dev) { |
1225 | dev->hard_header_len = rt->dst.dev->hard_header_len + | |
1da177e4 LT |
1226 | sizeof (struct ipv6hdr); |
1227 | ||
d1918542 | 1228 | dev->mtu = rt->dst.dev->mtu - sizeof (struct ipv6hdr); |
381601e5 AF |
1229 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
1230 | dev->mtu-=8; | |
1da177e4 LT |
1231 | |
1232 | if (dev->mtu < IPV6_MIN_MTU) | |
1233 | dev->mtu = IPV6_MIN_MTU; | |
1234 | } | |
94e187c0 | 1235 | ip6_rt_put(rt); |
1da177e4 LT |
1236 | } |
1237 | } | |
1238 | ||
1239 | /** | |
3144581c | 1240 | * ip6_tnl_change - update the tunnel parameters |
1da177e4 LT |
1241 | * @t: tunnel to be changed |
1242 | * @p: tunnel configuration parameters | |
1da177e4 LT |
1243 | * |
1244 | * Description: | |
3144581c | 1245 | * ip6_tnl_change() updates the tunnel parameters |
1da177e4 LT |
1246 | **/ |
1247 | ||
1248 | static int | |
c12b395a | 1249 | ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) |
1da177e4 | 1250 | { |
4e3fd7a0 AD |
1251 | t->parms.laddr = p->laddr; |
1252 | t->parms.raddr = p->raddr; | |
1da177e4 LT |
1253 | t->parms.flags = p->flags; |
1254 | t->parms.hop_limit = p->hop_limit; | |
1255 | t->parms.encap_limit = p->encap_limit; | |
1256 | t->parms.flowinfo = p->flowinfo; | |
8181b8c1 | 1257 | t->parms.link = p->link; |
502b0935 | 1258 | t->parms.proto = p->proto; |
0c088890 | 1259 | ip6_tnl_dst_reset(t); |
3144581c | 1260 | ip6_tnl_link_config(t); |
1da177e4 LT |
1261 | return 0; |
1262 | } | |
1263 | ||
0b112457 ND |
1264 | static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) |
1265 | { | |
1266 | struct net *net = dev_net(t->dev); | |
1267 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1268 | int err; | |
1269 | ||
1270 | ip6_tnl_unlink(ip6n, t); | |
1271 | synchronize_net(); | |
1272 | err = ip6_tnl_change(t, p); | |
1273 | ip6_tnl_link(ip6n, t); | |
1274 | netdev_state_change(t->dev); | |
1275 | return err; | |
1276 | } | |
1277 | ||
c12b395a | 1278 | static void |
1279 | ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u) | |
1280 | { | |
1281 | p->laddr = u->laddr; | |
1282 | p->raddr = u->raddr; | |
1283 | p->flags = u->flags; | |
1284 | p->hop_limit = u->hop_limit; | |
1285 | p->encap_limit = u->encap_limit; | |
1286 | p->flowinfo = u->flowinfo; | |
1287 | p->link = u->link; | |
1288 | p->proto = u->proto; | |
1289 | memcpy(p->name, u->name, sizeof(u->name)); | |
1290 | } | |
1291 | ||
1292 | static void | |
1293 | ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p) | |
1294 | { | |
1295 | u->laddr = p->laddr; | |
1296 | u->raddr = p->raddr; | |
1297 | u->flags = p->flags; | |
1298 | u->hop_limit = p->hop_limit; | |
1299 | u->encap_limit = p->encap_limit; | |
1300 | u->flowinfo = p->flowinfo; | |
1301 | u->link = p->link; | |
1302 | u->proto = p->proto; | |
1303 | memcpy(u->name, p->name, sizeof(u->name)); | |
1304 | } | |
1305 | ||
1da177e4 | 1306 | /** |
3144581c | 1307 | * ip6_tnl_ioctl - configure ipv6 tunnels from userspace |
1da177e4 LT |
1308 | * @dev: virtual device associated with tunnel |
1309 | * @ifr: parameters passed from userspace | |
1310 | * @cmd: command to be performed | |
1311 | * | |
1312 | * Description: | |
3144581c | 1313 | * ip6_tnl_ioctl() is used for managing IPv6 tunnels |
1ab1457c | 1314 | * from userspace. |
1da177e4 LT |
1315 | * |
1316 | * The possible commands are the following: | |
1317 | * %SIOCGETTUNNEL: get tunnel parameters for device | |
1318 | * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters | |
1319 | * %SIOCCHGTUNNEL: change tunnel parameters to those given | |
1320 | * %SIOCDELTUNNEL: delete tunnel | |
1321 | * | |
1ab1457c | 1322 | * The fallback device "ip6tnl0", created during module |
1da177e4 LT |
1323 | * initialization, can be used for creating other tunnel devices. |
1324 | * | |
1325 | * Return: | |
1326 | * 0 on success, | |
1327 | * %-EFAULT if unable to copy data to or from userspace, | |
1328 | * %-EPERM if current process hasn't %CAP_NET_ADMIN set | |
1329 | * %-EINVAL if passed tunnel parameters are invalid, | |
1330 | * %-EEXIST if changing a tunnel's parameters would cause a conflict | |
1331 | * %-ENODEV if attempting to change or delete a nonexisting device | |
1332 | **/ | |
1333 | ||
1334 | static int | |
3144581c | 1335 | ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
1da177e4 LT |
1336 | { |
1337 | int err = 0; | |
1da177e4 | 1338 | struct ip6_tnl_parm p; |
c12b395a | 1339 | struct __ip6_tnl_parm p1; |
1da177e4 | 1340 | struct ip6_tnl *t = NULL; |
2dd02c89 PE |
1341 | struct net *net = dev_net(dev); |
1342 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1da177e4 LT |
1343 | |
1344 | switch (cmd) { | |
1345 | case SIOCGETTUNNEL: | |
15820e12 | 1346 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 | 1347 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) { |
1da177e4 LT |
1348 | err = -EFAULT; |
1349 | break; | |
1350 | } | |
c12b395a | 1351 | ip6_tnl_parm_from_user(&p1, &p); |
1352 | t = ip6_tnl_locate(net, &p1, 0); | |
5ef5d6c5 DC |
1353 | } else { |
1354 | memset(&p, 0, sizeof(p)); | |
567131a7 VN |
1355 | } |
1356 | if (t == NULL) | |
2941a486 | 1357 | t = netdev_priv(dev); |
c12b395a | 1358 | ip6_tnl_parm_to_user(&p, &t->parms); |
1da177e4 LT |
1359 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) { |
1360 | err = -EFAULT; | |
1361 | } | |
1362 | break; | |
1363 | case SIOCADDTUNNEL: | |
1364 | case SIOCCHGTUNNEL: | |
1365 | err = -EPERM; | |
af31f412 | 1366 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 1367 | break; |
567131a7 VN |
1368 | err = -EFAULT; |
1369 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1370 | break; |
567131a7 | 1371 | err = -EINVAL; |
502b0935 YK |
1372 | if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && |
1373 | p.proto != 0) | |
1da177e4 | 1374 | break; |
c12b395a | 1375 | ip6_tnl_parm_from_user(&p1, &p); |
1376 | t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL); | |
15820e12 | 1377 | if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) { |
567131a7 VN |
1378 | if (t != NULL) { |
1379 | if (t->dev != dev) { | |
1380 | err = -EEXIST; | |
1381 | break; | |
1382 | } | |
1383 | } else | |
1384 | t = netdev_priv(dev); | |
1385 | ||
0b112457 | 1386 | err = ip6_tnl_update(t, &p1); |
1da177e4 | 1387 | } |
567131a7 | 1388 | if (t) { |
1da177e4 | 1389 | err = 0; |
c12b395a | 1390 | ip6_tnl_parm_to_user(&p, &t->parms); |
1391 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
567131a7 VN |
1392 | err = -EFAULT; |
1393 | ||
1394 | } else | |
1395 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1da177e4 LT |
1396 | break; |
1397 | case SIOCDELTUNNEL: | |
1398 | err = -EPERM; | |
af31f412 | 1399 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1400 | break; |
1401 | ||
15820e12 | 1402 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 VN |
1403 | err = -EFAULT; |
1404 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1405 | break; |
567131a7 | 1406 | err = -ENOENT; |
c12b395a | 1407 | ip6_tnl_parm_from_user(&p1, &p); |
1408 | t = ip6_tnl_locate(net, &p1, 0); | |
1409 | if (t == NULL) | |
1da177e4 | 1410 | break; |
567131a7 | 1411 | err = -EPERM; |
15820e12 | 1412 | if (t->dev == ip6n->fb_tnl_dev) |
1da177e4 | 1413 | break; |
567131a7 | 1414 | dev = t->dev; |
1da177e4 | 1415 | } |
22f8cde5 SH |
1416 | err = 0; |
1417 | unregister_netdevice(dev); | |
1da177e4 LT |
1418 | break; |
1419 | default: | |
1420 | err = -EINVAL; | |
1421 | } | |
1422 | return err; | |
1423 | } | |
1424 | ||
1da177e4 | 1425 | /** |
3144581c | 1426 | * ip6_tnl_change_mtu - change mtu manually for tunnel device |
1da177e4 LT |
1427 | * @dev: virtual device associated with tunnel |
1428 | * @new_mtu: the new mtu | |
1429 | * | |
1430 | * Return: | |
1431 | * 0 on success, | |
1432 | * %-EINVAL if mtu too small | |
1433 | **/ | |
1434 | ||
1435 | static int | |
3144581c | 1436 | ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) |
1da177e4 LT |
1437 | { |
1438 | if (new_mtu < IPV6_MIN_MTU) { | |
1439 | return -EINVAL; | |
1440 | } | |
1441 | dev->mtu = new_mtu; | |
1442 | return 0; | |
1443 | } | |
1444 | ||
1326c3d5 SH |
1445 | |
1446 | static const struct net_device_ops ip6_tnl_netdev_ops = { | |
8560f226 | 1447 | .ndo_uninit = ip6_tnl_dev_uninit, |
1326c3d5 | 1448 | .ndo_start_xmit = ip6_tnl_xmit, |
8560f226 | 1449 | .ndo_do_ioctl = ip6_tnl_ioctl, |
1326c3d5 | 1450 | .ndo_change_mtu = ip6_tnl_change_mtu, |
8560f226 | 1451 | .ndo_get_stats = ip6_get_stats, |
1326c3d5 SH |
1452 | }; |
1453 | ||
8560f226 | 1454 | |
1da177e4 | 1455 | /** |
3144581c | 1456 | * ip6_tnl_dev_setup - setup virtual tunnel device |
1da177e4 LT |
1457 | * @dev: virtual device associated with tunnel |
1458 | * | |
1459 | * Description: | |
1460 | * Initialize function pointers and device parameters | |
1461 | **/ | |
1462 | ||
3144581c | 1463 | static void ip6_tnl_dev_setup(struct net_device *dev) |
1da177e4 | 1464 | { |
381601e5 AF |
1465 | struct ip6_tnl *t; |
1466 | ||
1326c3d5 | 1467 | dev->netdev_ops = &ip6_tnl_netdev_ops; |
8560f226 | 1468 | dev->destructor = ip6_dev_free; |
1da177e4 LT |
1469 | |
1470 | dev->type = ARPHRD_TUNNEL6; | |
1471 | dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr); | |
1472 | dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr); | |
381601e5 AF |
1473 | t = netdev_priv(dev); |
1474 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1475 | dev->mtu-=8; | |
1da177e4 LT |
1476 | dev->flags |= IFF_NOARP; |
1477 | dev->addr_len = sizeof(struct in6_addr); | |
554eb277 | 1478 | dev->features |= NETIF_F_NETNS_LOCAL; |
7e223de8 | 1479 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
1da177e4 LT |
1480 | } |
1481 | ||
1482 | ||
1483 | /** | |
3144581c | 1484 | * ip6_tnl_dev_init_gen - general initializer for all tunnel devices |
1da177e4 LT |
1485 | * @dev: virtual device associated with tunnel |
1486 | **/ | |
1487 | ||
8560f226 | 1488 | static inline int |
3144581c | 1489 | ip6_tnl_dev_init_gen(struct net_device *dev) |
1da177e4 | 1490 | { |
2941a486 | 1491 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 | 1492 | |
1da177e4 | 1493 | t->dev = dev; |
8560f226 ED |
1494 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
1495 | if (!dev->tstats) | |
1496 | return -ENOMEM; | |
1497 | return 0; | |
1da177e4 LT |
1498 | } |
1499 | ||
1500 | /** | |
3144581c | 1501 | * ip6_tnl_dev_init - initializer for all non fallback tunnel devices |
1da177e4 LT |
1502 | * @dev: virtual device associated with tunnel |
1503 | **/ | |
1504 | ||
8560f226 | 1505 | static int ip6_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1506 | { |
2941a486 | 1507 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 ED |
1508 | int err = ip6_tnl_dev_init_gen(dev); |
1509 | ||
1510 | if (err) | |
1511 | return err; | |
3144581c | 1512 | ip6_tnl_link_config(t); |
8560f226 | 1513 | return 0; |
1da177e4 LT |
1514 | } |
1515 | ||
1516 | /** | |
3144581c | 1517 | * ip6_fb_tnl_dev_init - initializer for fallback tunnel device |
1da177e4 LT |
1518 | * @dev: fallback device |
1519 | * | |
1520 | * Return: 0 | |
1521 | **/ | |
1522 | ||
8560f226 | 1523 | static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1524 | { |
2941a486 | 1525 | struct ip6_tnl *t = netdev_priv(dev); |
3e6c9fb5 PE |
1526 | struct net *net = dev_net(dev); |
1527 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
8560f226 ED |
1528 | int err = ip6_tnl_dev_init_gen(dev); |
1529 | ||
1530 | if (err) | |
1531 | return err; | |
3e6c9fb5 | 1532 | |
502b0935 | 1533 | t->parms.proto = IPPROTO_IPV6; |
1da177e4 | 1534 | dev_hold(dev); |
d0087b29 VN |
1535 | |
1536 | ip6_tnl_link_config(t); | |
1537 | ||
cf778b00 | 1538 | rcu_assign_pointer(ip6n->tnls_wc[0], t); |
8560f226 | 1539 | return 0; |
1da177e4 LT |
1540 | } |
1541 | ||
0b112457 ND |
1542 | static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[]) |
1543 | { | |
1544 | u8 proto; | |
1545 | ||
1546 | if (!data) | |
1547 | return 0; | |
1548 | ||
1549 | proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1550 | if (proto != IPPROTO_IPV6 && | |
1551 | proto != IPPROTO_IPIP && | |
1552 | proto != 0) | |
1553 | return -EINVAL; | |
1554 | ||
1555 | return 0; | |
1556 | } | |
1557 | ||
1558 | static void ip6_tnl_netlink_parms(struct nlattr *data[], | |
1559 | struct __ip6_tnl_parm *parms) | |
1560 | { | |
1561 | memset(parms, 0, sizeof(*parms)); | |
1562 | ||
1563 | if (!data) | |
1564 | return; | |
1565 | ||
1566 | if (data[IFLA_IPTUN_LINK]) | |
1567 | parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); | |
1568 | ||
1569 | if (data[IFLA_IPTUN_LOCAL]) | |
1570 | nla_memcpy(&parms->laddr, data[IFLA_IPTUN_LOCAL], | |
1571 | sizeof(struct in6_addr)); | |
1572 | ||
1573 | if (data[IFLA_IPTUN_REMOTE]) | |
1574 | nla_memcpy(&parms->raddr, data[IFLA_IPTUN_REMOTE], | |
1575 | sizeof(struct in6_addr)); | |
1576 | ||
1577 | if (data[IFLA_IPTUN_TTL]) | |
1578 | parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]); | |
1579 | ||
1580 | if (data[IFLA_IPTUN_ENCAP_LIMIT]) | |
1581 | parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]); | |
1582 | ||
1583 | if (data[IFLA_IPTUN_FLOWINFO]) | |
1ff05fb7 | 1584 | parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]); |
0b112457 ND |
1585 | |
1586 | if (data[IFLA_IPTUN_FLAGS]) | |
1587 | parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]); | |
1588 | ||
1589 | if (data[IFLA_IPTUN_PROTO]) | |
1590 | parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1591 | } | |
1592 | ||
1593 | static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev, | |
1594 | struct nlattr *tb[], struct nlattr *data[]) | |
1595 | { | |
1596 | struct net *net = dev_net(dev); | |
1597 | struct ip6_tnl *nt; | |
1598 | ||
1599 | nt = netdev_priv(dev); | |
1600 | ip6_tnl_netlink_parms(data, &nt->parms); | |
1601 | ||
1602 | if (ip6_tnl_locate(net, &nt->parms, 0)) | |
1603 | return -EEXIST; | |
1604 | ||
1605 | return ip6_tnl_create2(dev); | |
1606 | } | |
1607 | ||
1608 | static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[], | |
1609 | struct nlattr *data[]) | |
1610 | { | |
1611 | struct ip6_tnl *t; | |
1612 | struct __ip6_tnl_parm p; | |
1613 | struct net *net = dev_net(dev); | |
1614 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1615 | ||
1616 | if (dev == ip6n->fb_tnl_dev) | |
1617 | return -EINVAL; | |
1618 | ||
1619 | ip6_tnl_netlink_parms(data, &p); | |
1620 | ||
1621 | t = ip6_tnl_locate(net, &p, 0); | |
1622 | ||
1623 | if (t) { | |
1624 | if (t->dev != dev) | |
1625 | return -EEXIST; | |
1626 | } else | |
1627 | t = netdev_priv(dev); | |
1628 | ||
1629 | return ip6_tnl_update(t, &p); | |
1630 | } | |
1631 | ||
b58d731a | 1632 | static size_t ip6_tnl_get_size(const struct net_device *dev) |
c075b130 ND |
1633 | { |
1634 | return | |
1635 | /* IFLA_IPTUN_LINK */ | |
1636 | nla_total_size(4) + | |
1637 | /* IFLA_IPTUN_LOCAL */ | |
1638 | nla_total_size(sizeof(struct in6_addr)) + | |
1639 | /* IFLA_IPTUN_REMOTE */ | |
1640 | nla_total_size(sizeof(struct in6_addr)) + | |
1641 | /* IFLA_IPTUN_TTL */ | |
1642 | nla_total_size(1) + | |
1643 | /* IFLA_IPTUN_ENCAP_LIMIT */ | |
1644 | nla_total_size(1) + | |
1645 | /* IFLA_IPTUN_FLOWINFO */ | |
1646 | nla_total_size(4) + | |
1647 | /* IFLA_IPTUN_FLAGS */ | |
1648 | nla_total_size(4) + | |
cfa323b6 ND |
1649 | /* IFLA_IPTUN_PROTO */ |
1650 | nla_total_size(1) + | |
c075b130 ND |
1651 | 0; |
1652 | } | |
1653 | ||
b58d731a | 1654 | static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev) |
c075b130 ND |
1655 | { |
1656 | struct ip6_tnl *tunnel = netdev_priv(dev); | |
1657 | struct __ip6_tnl_parm *parm = &tunnel->parms; | |
1658 | ||
1659 | if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || | |
1660 | nla_put(skb, IFLA_IPTUN_LOCAL, sizeof(struct in6_addr), | |
1661 | &parm->raddr) || | |
1662 | nla_put(skb, IFLA_IPTUN_REMOTE, sizeof(struct in6_addr), | |
1663 | &parm->laddr) || | |
1664 | nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) || | |
1665 | nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) || | |
1666 | nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) || | |
cfa323b6 ND |
1667 | nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) || |
1668 | nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto)) | |
c075b130 ND |
1669 | goto nla_put_failure; |
1670 | return 0; | |
1671 | ||
1672 | nla_put_failure: | |
1673 | return -EMSGSIZE; | |
1674 | } | |
1675 | ||
0b112457 ND |
1676 | static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = { |
1677 | [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, | |
1678 | [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) }, | |
1679 | [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) }, | |
1680 | [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, | |
1681 | [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 }, | |
1682 | [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 }, | |
1683 | [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 }, | |
1684 | [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, | |
1685 | }; | |
1686 | ||
c075b130 ND |
1687 | static struct rtnl_link_ops ip6_link_ops __read_mostly = { |
1688 | .kind = "ip6tnl", | |
1689 | .maxtype = IFLA_IPTUN_MAX, | |
0b112457 | 1690 | .policy = ip6_tnl_policy, |
c075b130 | 1691 | .priv_size = sizeof(struct ip6_tnl), |
0b112457 ND |
1692 | .setup = ip6_tnl_dev_setup, |
1693 | .validate = ip6_tnl_validate, | |
1694 | .newlink = ip6_tnl_newlink, | |
1695 | .changelink = ip6_tnl_changelink, | |
b58d731a ND |
1696 | .get_size = ip6_tnl_get_size, |
1697 | .fill_info = ip6_tnl_fill_info, | |
c075b130 ND |
1698 | }; |
1699 | ||
3ff2cfa5 | 1700 | static struct xfrm6_tunnel ip4ip6_handler __read_mostly = { |
c4d3efaf YK |
1701 | .handler = ip4ip6_rcv, |
1702 | .err_handler = ip4ip6_err, | |
1703 | .priority = 1, | |
1704 | }; | |
1705 | ||
3ff2cfa5 | 1706 | static struct xfrm6_tunnel ip6ip6_handler __read_mostly = { |
0303770d PM |
1707 | .handler = ip6ip6_rcv, |
1708 | .err_handler = ip6ip6_err, | |
d2acc347 | 1709 | .priority = 1, |
1da177e4 LT |
1710 | }; |
1711 | ||
2c8c1e72 | 1712 | static void __net_exit ip6_tnl_destroy_tunnels(struct ip6_tnl_net *ip6n) |
3e6c9fb5 PE |
1713 | { |
1714 | int h; | |
1715 | struct ip6_tnl *t; | |
cf4432f5 | 1716 | LIST_HEAD(list); |
3e6c9fb5 PE |
1717 | |
1718 | for (h = 0; h < HASH_SIZE; h++) { | |
94767632 | 1719 | t = rtnl_dereference(ip6n->tnls_r_l[h]); |
cf4432f5 ED |
1720 | while (t != NULL) { |
1721 | unregister_netdevice_queue(t->dev, &list); | |
94767632 | 1722 | t = rtnl_dereference(t->next); |
cf4432f5 | 1723 | } |
3e6c9fb5 PE |
1724 | } |
1725 | ||
94767632 | 1726 | t = rtnl_dereference(ip6n->tnls_wc[0]); |
cf4432f5 ED |
1727 | unregister_netdevice_queue(t->dev, &list); |
1728 | unregister_netdevice_many(&list); | |
3e6c9fb5 PE |
1729 | } |
1730 | ||
2c8c1e72 | 1731 | static int __net_init ip6_tnl_init_net(struct net *net) |
13eeb8e9 | 1732 | { |
ac31cd3c | 1733 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
731abb9c | 1734 | struct ip6_tnl *t = NULL; |
13eeb8e9 | 1735 | int err; |
13eeb8e9 | 1736 | |
3e6c9fb5 PE |
1737 | ip6n->tnls[0] = ip6n->tnls_wc; |
1738 | ip6n->tnls[1] = ip6n->tnls_r_l; | |
1739 | ||
15820e12 PE |
1740 | err = -ENOMEM; |
1741 | ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", | |
1742 | ip6_tnl_dev_setup); | |
1743 | ||
1744 | if (!ip6n->fb_tnl_dev) | |
1745 | goto err_alloc_dev; | |
be77e593 | 1746 | dev_net_set(ip6n->fb_tnl_dev, net); |
15820e12 | 1747 | |
8560f226 ED |
1748 | err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); |
1749 | if (err < 0) | |
1750 | goto err_register; | |
15820e12 PE |
1751 | |
1752 | err = register_netdev(ip6n->fb_tnl_dev); | |
1753 | if (err < 0) | |
1754 | goto err_register; | |
731abb9c JB |
1755 | |
1756 | t = netdev_priv(ip6n->fb_tnl_dev); | |
1757 | ||
1758 | strcpy(t->parms.name, ip6n->fb_tnl_dev->name); | |
13eeb8e9 PE |
1759 | return 0; |
1760 | ||
15820e12 | 1761 | err_register: |
8560f226 | 1762 | ip6_dev_free(ip6n->fb_tnl_dev); |
15820e12 | 1763 | err_alloc_dev: |
13eeb8e9 PE |
1764 | return err; |
1765 | } | |
1766 | ||
2c8c1e72 | 1767 | static void __net_exit ip6_tnl_exit_net(struct net *net) |
13eeb8e9 | 1768 | { |
ac31cd3c | 1769 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
13eeb8e9 | 1770 | |
3e6c9fb5 PE |
1771 | rtnl_lock(); |
1772 | ip6_tnl_destroy_tunnels(ip6n); | |
1773 | rtnl_unlock(); | |
13eeb8e9 PE |
1774 | } |
1775 | ||
1776 | static struct pernet_operations ip6_tnl_net_ops = { | |
1777 | .init = ip6_tnl_init_net, | |
1778 | .exit = ip6_tnl_exit_net, | |
ac31cd3c EB |
1779 | .id = &ip6_tnl_net_id, |
1780 | .size = sizeof(struct ip6_tnl_net), | |
13eeb8e9 PE |
1781 | }; |
1782 | ||
1da177e4 LT |
1783 | /** |
1784 | * ip6_tunnel_init - register protocol and reserve needed resources | |
1785 | * | |
1786 | * Return: 0 on success | |
1787 | **/ | |
1788 | ||
1789 | static int __init ip6_tunnel_init(void) | |
1790 | { | |
1791 | int err; | |
1792 | ||
d5aa407f AD |
1793 | err = register_pernet_device(&ip6_tnl_net_ops); |
1794 | if (err < 0) | |
1795 | goto out_pernet; | |
1796 | ||
1797 | err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET); | |
1798 | if (err < 0) { | |
f3213831 | 1799 | pr_err("%s: can't register ip4ip6\n", __func__); |
d5aa407f | 1800 | goto out_ip4ip6; |
c4d3efaf YK |
1801 | } |
1802 | ||
d5aa407f AD |
1803 | err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6); |
1804 | if (err < 0) { | |
f3213831 | 1805 | pr_err("%s: can't register ip6ip6\n", __func__); |
d5aa407f | 1806 | goto out_ip6ip6; |
1da177e4 | 1807 | } |
c075b130 ND |
1808 | err = rtnl_link_register(&ip6_link_ops); |
1809 | if (err < 0) | |
1810 | goto rtnl_link_failed; | |
13eeb8e9 | 1811 | |
1da177e4 | 1812 | return 0; |
d5aa407f | 1813 | |
c075b130 ND |
1814 | rtnl_link_failed: |
1815 | xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6); | |
d5aa407f | 1816 | out_ip6ip6: |
c4d3efaf | 1817 | xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); |
d5aa407f AD |
1818 | out_ip4ip6: |
1819 | unregister_pernet_device(&ip6_tnl_net_ops); | |
1820 | out_pernet: | |
1da177e4 LT |
1821 | return err; |
1822 | } | |
1823 | ||
1824 | /** | |
1825 | * ip6_tunnel_cleanup - free resources and unregister protocol | |
1826 | **/ | |
1827 | ||
1828 | static void __exit ip6_tunnel_cleanup(void) | |
1829 | { | |
c075b130 | 1830 | rtnl_link_unregister(&ip6_link_ops); |
c4d3efaf | 1831 | if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) |
f3213831 | 1832 | pr_info("%s: can't deregister ip4ip6\n", __func__); |
c4d3efaf | 1833 | |
73d605d1 | 1834 | if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) |
f3213831 | 1835 | pr_info("%s: can't deregister ip6ip6\n", __func__); |
1da177e4 | 1836 | |
ac31cd3c | 1837 | unregister_pernet_device(&ip6_tnl_net_ops); |
1da177e4 LT |
1838 | } |
1839 | ||
1840 | module_init(ip6_tunnel_init); | |
1841 | module_exit(ip6_tunnel_cleanup); |