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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> |
e837735e | 44 | #include <linux/etherdevice.h> |
1da177e4 LT |
45 | |
46 | #include <asm/uaccess.h> | |
60063497 | 47 | #include <linux/atomic.h> |
1da177e4 | 48 | |
c4d3efaf | 49 | #include <net/icmp.h> |
1da177e4 | 50 | #include <net/ip.h> |
c5441932 | 51 | #include <net/ip_tunnels.h> |
1da177e4 | 52 | #include <net/ipv6.h> |
1da177e4 LT |
53 | #include <net/ip6_route.h> |
54 | #include <net/addrconf.h> | |
55 | #include <net/ip6_tunnel.h> | |
56 | #include <net/xfrm.h> | |
57 | #include <net/dsfield.h> | |
58 | #include <net/inet_ecn.h> | |
13eeb8e9 PE |
59 | #include <net/net_namespace.h> |
60 | #include <net/netns/generic.h> | |
1da177e4 LT |
61 | |
62 | MODULE_AUTHOR("Ville Nuorvala"); | |
c4d3efaf | 63 | MODULE_DESCRIPTION("IPv6 tunneling device"); |
1da177e4 | 64 | MODULE_LICENSE("GPL"); |
6dfbd87a | 65 | MODULE_ALIAS_NETDEV("ip6tnl0"); |
1da177e4 | 66 | |
1da177e4 | 67 | #ifdef IP6_TNL_DEBUG |
91df42be | 68 | #define IP6_TNL_TRACE(x...) pr_debug("%s:" x "\n", __func__) |
1da177e4 LT |
69 | #else |
70 | #define IP6_TNL_TRACE(x...) do {;} while(0) | |
71 | #endif | |
72 | ||
73 | #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK) | |
c4d3efaf | 74 | #define IPV6_TCLASS_SHIFT 20 |
1da177e4 | 75 | |
ddbe5032 ED |
76 | #define HASH_SIZE_SHIFT 5 |
77 | #define HASH_SIZE (1 << HASH_SIZE_SHIFT) | |
1da177e4 | 78 | |
f4e0b4c5 ND |
79 | static bool log_ecn_error = true; |
80 | module_param(log_ecn_error, bool, 0644); | |
81 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); | |
82 | ||
ddbe5032 ED |
83 | static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2) |
84 | { | |
85 | u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2); | |
86 | ||
87 | return hash_32(hash, HASH_SIZE_SHIFT); | |
88 | } | |
1da177e4 | 89 | |
8560f226 | 90 | static int ip6_tnl_dev_init(struct net_device *dev); |
3144581c | 91 | static void ip6_tnl_dev_setup(struct net_device *dev); |
c075b130 | 92 | static struct rtnl_link_ops ip6_link_ops __read_mostly; |
1da177e4 | 93 | |
f99189b1 | 94 | static int ip6_tnl_net_id __read_mostly; |
13eeb8e9 | 95 | struct ip6_tnl_net { |
15820e12 PE |
96 | /* the IPv6 tunnel fallback device */ |
97 | struct net_device *fb_tnl_dev; | |
3e6c9fb5 | 98 | /* lists for storing tunnels in use */ |
94767632 ED |
99 | struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE]; |
100 | struct ip6_tnl __rcu *tnls_wc[1]; | |
101 | struct ip6_tnl __rcu **tnls[2]; | |
13eeb8e9 PE |
102 | }; |
103 | ||
8560f226 ED |
104 | static struct net_device_stats *ip6_get_stats(struct net_device *dev) |
105 | { | |
106 | struct pcpu_tstats sum = { 0 }; | |
107 | int i; | |
108 | ||
109 | for_each_possible_cpu(i) { | |
110 | const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i); | |
111 | ||
112 | sum.rx_packets += tstats->rx_packets; | |
113 | sum.rx_bytes += tstats->rx_bytes; | |
114 | sum.tx_packets += tstats->tx_packets; | |
115 | sum.tx_bytes += tstats->tx_bytes; | |
116 | } | |
117 | dev->stats.rx_packets = sum.rx_packets; | |
118 | dev->stats.rx_bytes = sum.rx_bytes; | |
119 | dev->stats.tx_packets = sum.tx_packets; | |
120 | dev->stats.tx_bytes = sum.tx_bytes; | |
121 | return &dev->stats; | |
122 | } | |
123 | ||
2922bc8a | 124 | /* |
94767632 | 125 | * Locking : hash tables are protected by RCU and RTNL |
2922bc8a | 126 | */ |
1da177e4 | 127 | |
c12b395a | 128 | struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t) |
1da177e4 LT |
129 | { |
130 | struct dst_entry *dst = t->dst_cache; | |
131 | ||
1ab1457c | 132 | if (dst && dst->obsolete && |
1da177e4 LT |
133 | dst->ops->check(dst, t->dst_cookie) == NULL) { |
134 | t->dst_cache = NULL; | |
135 | dst_release(dst); | |
136 | return NULL; | |
137 | } | |
138 | ||
139 | return dst; | |
140 | } | |
c12b395a | 141 | EXPORT_SYMBOL_GPL(ip6_tnl_dst_check); |
1da177e4 | 142 | |
c12b395a | 143 | void ip6_tnl_dst_reset(struct ip6_tnl *t) |
1da177e4 LT |
144 | { |
145 | dst_release(t->dst_cache); | |
146 | t->dst_cache = NULL; | |
147 | } | |
c12b395a | 148 | EXPORT_SYMBOL_GPL(ip6_tnl_dst_reset); |
1da177e4 | 149 | |
c12b395a | 150 | void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst) |
1da177e4 LT |
151 | { |
152 | struct rt6_info *rt = (struct rt6_info *) dst; | |
153 | t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0; | |
154 | dst_release(t->dst_cache); | |
155 | t->dst_cache = dst; | |
156 | } | |
c12b395a | 157 | EXPORT_SYMBOL_GPL(ip6_tnl_dst_store); |
1da177e4 LT |
158 | |
159 | /** | |
3144581c | 160 | * ip6_tnl_lookup - fetch tunnel matching the end-point addresses |
1ab1457c YH |
161 | * @remote: the address of the tunnel exit-point |
162 | * @local: the address of the tunnel entry-point | |
1da177e4 | 163 | * |
1ab1457c | 164 | * Return: |
1da177e4 | 165 | * tunnel matching given end-points if found, |
1ab1457c | 166 | * else fallback tunnel if its device is up, |
1da177e4 LT |
167 | * else %NULL |
168 | **/ | |
169 | ||
2922bc8a ED |
170 | #define for_each_ip6_tunnel_rcu(start) \ |
171 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) | |
172 | ||
1da177e4 | 173 | static struct ip6_tnl * |
b71d1d42 | 174 | ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local) |
1da177e4 | 175 | { |
ddbe5032 | 176 | unsigned int hash = HASH(remote, local); |
1da177e4 | 177 | struct ip6_tnl *t; |
3e6c9fb5 | 178 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 179 | |
ddbe5032 | 180 | for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { |
1da177e4 LT |
181 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
182 | ipv6_addr_equal(remote, &t->parms.raddr) && | |
183 | (t->dev->flags & IFF_UP)) | |
184 | return t; | |
185 | } | |
2922bc8a ED |
186 | t = rcu_dereference(ip6n->tnls_wc[0]); |
187 | if (t && (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
188 | return t; |
189 | ||
190 | return NULL; | |
191 | } | |
192 | ||
193 | /** | |
3144581c | 194 | * ip6_tnl_bucket - get head of list matching given tunnel parameters |
1ab1457c | 195 | * @p: parameters containing tunnel end-points |
1da177e4 LT |
196 | * |
197 | * Description: | |
3144581c | 198 | * ip6_tnl_bucket() returns the head of the list matching the |
1da177e4 LT |
199 | * &struct in6_addr entries laddr and raddr in @p. |
200 | * | |
1ab1457c | 201 | * Return: head of IPv6 tunnel list |
1da177e4 LT |
202 | **/ |
203 | ||
94767632 | 204 | static struct ip6_tnl __rcu ** |
c12b395a | 205 | ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p) |
1da177e4 | 206 | { |
b71d1d42 ED |
207 | const struct in6_addr *remote = &p->raddr; |
208 | const struct in6_addr *local = &p->laddr; | |
95c96174 | 209 | unsigned int h = 0; |
1da177e4 LT |
210 | int prio = 0; |
211 | ||
212 | if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { | |
213 | prio = 1; | |
ddbe5032 | 214 | h = HASH(remote, local); |
1da177e4 | 215 | } |
3e6c9fb5 | 216 | return &ip6n->tnls[prio][h]; |
1da177e4 LT |
217 | } |
218 | ||
219 | /** | |
3144581c | 220 | * ip6_tnl_link - add tunnel to hash table |
1da177e4 LT |
221 | * @t: tunnel to be added |
222 | **/ | |
223 | ||
224 | static void | |
2dd02c89 | 225 | ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 226 | { |
94767632 | 227 | struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms); |
1da177e4 | 228 | |
cf778b00 ED |
229 | rcu_assign_pointer(t->next , rtnl_dereference(*tp)); |
230 | rcu_assign_pointer(*tp, t); | |
1da177e4 LT |
231 | } |
232 | ||
233 | /** | |
3144581c | 234 | * ip6_tnl_unlink - remove tunnel from hash table |
1da177e4 LT |
235 | * @t: tunnel to be removed |
236 | **/ | |
237 | ||
238 | static void | |
2dd02c89 | 239 | ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 240 | { |
94767632 ED |
241 | struct ip6_tnl __rcu **tp; |
242 | struct ip6_tnl *iter; | |
243 | ||
244 | for (tp = ip6_tnl_bucket(ip6n, &t->parms); | |
245 | (iter = rtnl_dereference(*tp)) != NULL; | |
246 | tp = &iter->next) { | |
247 | if (t == iter) { | |
cf778b00 | 248 | rcu_assign_pointer(*tp, t->next); |
1da177e4 LT |
249 | break; |
250 | } | |
251 | } | |
252 | } | |
253 | ||
8560f226 ED |
254 | static void ip6_dev_free(struct net_device *dev) |
255 | { | |
256 | free_percpu(dev->tstats); | |
257 | free_netdev(dev); | |
258 | } | |
259 | ||
0b112457 ND |
260 | static int ip6_tnl_create2(struct net_device *dev) |
261 | { | |
262 | struct ip6_tnl *t = netdev_priv(dev); | |
263 | struct net *net = dev_net(dev); | |
264 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
265 | int err; | |
266 | ||
267 | t = netdev_priv(dev); | |
268 | err = ip6_tnl_dev_init(dev); | |
269 | if (err < 0) | |
270 | goto out; | |
271 | ||
272 | err = register_netdevice(dev); | |
273 | if (err < 0) | |
274 | goto out; | |
275 | ||
276 | strcpy(t->parms.name, dev->name); | |
277 | dev->rtnl_link_ops = &ip6_link_ops; | |
278 | ||
279 | dev_hold(dev); | |
280 | ip6_tnl_link(ip6n, t); | |
281 | return 0; | |
282 | ||
283 | out: | |
284 | return err; | |
285 | } | |
286 | ||
1da177e4 | 287 | /** |
2c53040f | 288 | * ip6_tnl_create - create a new tunnel |
1da177e4 LT |
289 | * @p: tunnel parameters |
290 | * @pt: pointer to new tunnel | |
291 | * | |
292 | * Description: | |
293 | * Create tunnel matching given parameters. | |
1ab1457c YH |
294 | * |
295 | * Return: | |
567131a7 | 296 | * created tunnel or NULL |
1da177e4 LT |
297 | **/ |
298 | ||
c12b395a | 299 | static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p) |
1da177e4 LT |
300 | { |
301 | struct net_device *dev; | |
302 | struct ip6_tnl *t; | |
303 | char name[IFNAMSIZ]; | |
304 | int err; | |
305 | ||
34cc7ba6 | 306 | if (p->name[0]) |
1da177e4 | 307 | strlcpy(name, p->name, IFNAMSIZ); |
34cc7ba6 PE |
308 | else |
309 | sprintf(name, "ip6tnl%%d"); | |
310 | ||
3144581c | 311 | dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup); |
1da177e4 | 312 | if (dev == NULL) |
567131a7 | 313 | goto failed; |
1da177e4 | 314 | |
554eb277 PE |
315 | dev_net_set(dev, net); |
316 | ||
2941a486 | 317 | t = netdev_priv(dev); |
1da177e4 | 318 | t->parms = *p; |
0bd87628 | 319 | t->net = dev_net(dev); |
0b112457 | 320 | err = ip6_tnl_create2(dev); |
8560f226 ED |
321 | if (err < 0) |
322 | goto failed_free; | |
1da177e4 | 323 | |
567131a7 | 324 | return t; |
b37d428b PE |
325 | |
326 | failed_free: | |
8560f226 | 327 | ip6_dev_free(dev); |
567131a7 VN |
328 | failed: |
329 | return NULL; | |
1da177e4 LT |
330 | } |
331 | ||
332 | /** | |
3144581c | 333 | * ip6_tnl_locate - find or create tunnel matching given parameters |
1ab1457c | 334 | * @p: tunnel parameters |
1da177e4 LT |
335 | * @create: != 0 if allowed to create new tunnel if no match found |
336 | * | |
337 | * Description: | |
3144581c | 338 | * ip6_tnl_locate() first tries to locate an existing tunnel |
1da177e4 LT |
339 | * based on @parms. If this is unsuccessful, but @create is set a new |
340 | * tunnel device is created and registered for use. | |
341 | * | |
342 | * Return: | |
567131a7 | 343 | * matching tunnel or NULL |
1da177e4 LT |
344 | **/ |
345 | ||
2dd02c89 | 346 | static struct ip6_tnl *ip6_tnl_locate(struct net *net, |
c12b395a | 347 | struct __ip6_tnl_parm *p, int create) |
1da177e4 | 348 | { |
b71d1d42 ED |
349 | const struct in6_addr *remote = &p->raddr; |
350 | const struct in6_addr *local = &p->laddr; | |
94767632 | 351 | struct ip6_tnl __rcu **tp; |
1da177e4 | 352 | struct ip6_tnl *t; |
2dd02c89 | 353 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 354 | |
94767632 ED |
355 | for (tp = ip6_tnl_bucket(ip6n, p); |
356 | (t = rtnl_dereference(*tp)) != NULL; | |
357 | tp = &t->next) { | |
1da177e4 | 358 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
567131a7 VN |
359 | ipv6_addr_equal(remote, &t->parms.raddr)) |
360 | return t; | |
1da177e4 LT |
361 | } |
362 | if (!create) | |
567131a7 | 363 | return NULL; |
2dd02c89 | 364 | return ip6_tnl_create(net, p); |
1da177e4 LT |
365 | } |
366 | ||
367 | /** | |
3144581c | 368 | * ip6_tnl_dev_uninit - tunnel device uninitializer |
1da177e4 | 369 | * @dev: the device to be destroyed |
1ab1457c | 370 | * |
1da177e4 | 371 | * Description: |
3144581c | 372 | * ip6_tnl_dev_uninit() removes tunnel from its list |
1da177e4 LT |
373 | **/ |
374 | ||
375 | static void | |
3144581c | 376 | ip6_tnl_dev_uninit(struct net_device *dev) |
1da177e4 | 377 | { |
2941a486 | 378 | struct ip6_tnl *t = netdev_priv(dev); |
0bd87628 | 379 | struct net *net = t->net; |
2dd02c89 | 380 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 381 | |
94767632 | 382 | if (dev == ip6n->fb_tnl_dev) |
a9b3cd7f | 383 | RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL); |
94767632 | 384 | else |
2dd02c89 | 385 | ip6_tnl_unlink(ip6n, t); |
1da177e4 LT |
386 | ip6_tnl_dst_reset(t); |
387 | dev_put(dev); | |
388 | } | |
389 | ||
390 | /** | |
391 | * parse_tvl_tnl_enc_lim - handle encapsulation limit option | |
392 | * @skb: received socket buffer | |
393 | * | |
1ab1457c YH |
394 | * Return: |
395 | * 0 if none was found, | |
1da177e4 LT |
396 | * else index to encapsulation limit |
397 | **/ | |
398 | ||
c12b395a | 399 | __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw) |
1da177e4 | 400 | { |
b71d1d42 | 401 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw; |
1da177e4 LT |
402 | __u8 nexthdr = ipv6h->nexthdr; |
403 | __u16 off = sizeof (*ipv6h); | |
404 | ||
405 | while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { | |
406 | __u16 optlen = 0; | |
407 | struct ipv6_opt_hdr *hdr; | |
408 | if (raw + off + sizeof (*hdr) > skb->data && | |
409 | !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr))) | |
410 | break; | |
411 | ||
412 | hdr = (struct ipv6_opt_hdr *) (raw + off); | |
413 | if (nexthdr == NEXTHDR_FRAGMENT) { | |
414 | struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; | |
415 | if (frag_hdr->frag_off) | |
416 | break; | |
417 | optlen = 8; | |
418 | } else if (nexthdr == NEXTHDR_AUTH) { | |
419 | optlen = (hdr->hdrlen + 2) << 2; | |
420 | } else { | |
421 | optlen = ipv6_optlen(hdr); | |
422 | } | |
423 | if (nexthdr == NEXTHDR_DEST) { | |
424 | __u16 i = off + 2; | |
425 | while (1) { | |
426 | struct ipv6_tlv_tnl_enc_lim *tel; | |
427 | ||
428 | /* No more room for encapsulation limit */ | |
429 | if (i + sizeof (*tel) > off + optlen) | |
430 | break; | |
431 | ||
432 | tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i]; | |
433 | /* return index of option if found and valid */ | |
434 | if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && | |
435 | tel->length == 1) | |
436 | return i; | |
437 | /* else jump to next option */ | |
438 | if (tel->type) | |
439 | i += tel->length + 2; | |
440 | else | |
441 | i++; | |
442 | } | |
443 | } | |
444 | nexthdr = hdr->nexthdr; | |
445 | off += optlen; | |
446 | } | |
447 | return 0; | |
448 | } | |
c12b395a | 449 | EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim); |
1da177e4 LT |
450 | |
451 | /** | |
e490d1d8 | 452 | * ip6_tnl_err - tunnel error handler |
1da177e4 LT |
453 | * |
454 | * Description: | |
e490d1d8 | 455 | * ip6_tnl_err() should handle errors in the tunnel according |
1da177e4 LT |
456 | * to the specifications in RFC 2473. |
457 | **/ | |
458 | ||
d2acc347 | 459 | static int |
502b0935 | 460 | ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, |
d5fdd6ba | 461 | u8 *type, u8 *code, int *msg, __u32 *info, int offset) |
1da177e4 | 462 | { |
b71d1d42 | 463 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data; |
1da177e4 LT |
464 | struct ip6_tnl *t; |
465 | int rel_msg = 0; | |
d5fdd6ba BH |
466 | u8 rel_type = ICMPV6_DEST_UNREACH; |
467 | u8 rel_code = ICMPV6_ADDR_UNREACH; | |
1da177e4 LT |
468 | __u32 rel_info = 0; |
469 | __u16 len; | |
d2acc347 | 470 | int err = -ENOENT; |
1da177e4 | 471 | |
1ab1457c YH |
472 | /* If the packet doesn't contain the original IPv6 header we are |
473 | in trouble since we might need the source address for further | |
1da177e4 LT |
474 | processing of the error. */ |
475 | ||
2922bc8a | 476 | rcu_read_lock(); |
8704ca7e | 477 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, |
2dd02c89 | 478 | &ipv6h->saddr)) == NULL) |
1da177e4 LT |
479 | goto out; |
480 | ||
502b0935 YK |
481 | if (t->parms.proto != ipproto && t->parms.proto != 0) |
482 | goto out; | |
483 | ||
d2acc347 HX |
484 | err = 0; |
485 | ||
e490d1d8 | 486 | switch (*type) { |
1da177e4 LT |
487 | __u32 teli; |
488 | struct ipv6_tlv_tnl_enc_lim *tel; | |
489 | __u32 mtu; | |
490 | case ICMPV6_DEST_UNREACH: | |
e87cc472 JP |
491 | net_warn_ratelimited("%s: Path to destination invalid or inactive!\n", |
492 | t->parms.name); | |
1da177e4 LT |
493 | rel_msg = 1; |
494 | break; | |
495 | case ICMPV6_TIME_EXCEED: | |
e490d1d8 | 496 | if ((*code) == ICMPV6_EXC_HOPLIMIT) { |
e87cc472 JP |
497 | net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", |
498 | t->parms.name); | |
1da177e4 LT |
499 | rel_msg = 1; |
500 | } | |
501 | break; | |
502 | case ICMPV6_PARAMPROB: | |
107a5fe6 | 503 | teli = 0; |
e490d1d8 | 504 | if ((*code) == ICMPV6_HDR_FIELD) |
c12b395a | 505 | teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); |
1da177e4 | 506 | |
704eae1f | 507 | if (teli && teli == *info - 2) { |
1da177e4 LT |
508 | tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; |
509 | if (tel->encap_limit == 0) { | |
e87cc472 JP |
510 | net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", |
511 | t->parms.name); | |
1da177e4 LT |
512 | rel_msg = 1; |
513 | } | |
e87cc472 JP |
514 | } else { |
515 | net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n", | |
516 | t->parms.name); | |
1da177e4 LT |
517 | } |
518 | break; | |
519 | case ICMPV6_PKT_TOOBIG: | |
704eae1f | 520 | mtu = *info - offset; |
1da177e4 LT |
521 | if (mtu < IPV6_MIN_MTU) |
522 | mtu = IPV6_MIN_MTU; | |
523 | t->dev->mtu = mtu; | |
524 | ||
cc6cdac0 | 525 | if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) { |
1da177e4 LT |
526 | rel_type = ICMPV6_PKT_TOOBIG; |
527 | rel_code = 0; | |
528 | rel_info = mtu; | |
529 | rel_msg = 1; | |
530 | } | |
531 | break; | |
532 | } | |
e490d1d8 YK |
533 | |
534 | *type = rel_type; | |
535 | *code = rel_code; | |
536 | *info = rel_info; | |
537 | *msg = rel_msg; | |
538 | ||
539 | out: | |
2922bc8a | 540 | rcu_read_unlock(); |
e490d1d8 YK |
541 | return err; |
542 | } | |
543 | ||
c4d3efaf YK |
544 | static int |
545 | ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 546 | u8 type, u8 code, int offset, __be32 info) |
c4d3efaf YK |
547 | { |
548 | int rel_msg = 0; | |
d5fdd6ba BH |
549 | u8 rel_type = type; |
550 | u8 rel_code = code; | |
704eae1f | 551 | __u32 rel_info = ntohl(info); |
c4d3efaf YK |
552 | int err; |
553 | struct sk_buff *skb2; | |
b71d1d42 | 554 | const struct iphdr *eiph; |
c4d3efaf | 555 | struct rtable *rt; |
31e4543d | 556 | struct flowi4 fl4; |
c4d3efaf | 557 | |
502b0935 YK |
558 | err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, |
559 | &rel_msg, &rel_info, offset); | |
c4d3efaf YK |
560 | if (err < 0) |
561 | return err; | |
562 | ||
563 | if (rel_msg == 0) | |
564 | return 0; | |
565 | ||
566 | switch (rel_type) { | |
567 | case ICMPV6_DEST_UNREACH: | |
568 | if (rel_code != ICMPV6_ADDR_UNREACH) | |
569 | return 0; | |
570 | rel_type = ICMP_DEST_UNREACH; | |
571 | rel_code = ICMP_HOST_UNREACH; | |
572 | break; | |
573 | case ICMPV6_PKT_TOOBIG: | |
574 | if (rel_code != 0) | |
575 | return 0; | |
576 | rel_type = ICMP_DEST_UNREACH; | |
577 | rel_code = ICMP_FRAG_NEEDED; | |
578 | break; | |
ec18d9a2 DM |
579 | case NDISC_REDIRECT: |
580 | rel_type = ICMP_REDIRECT; | |
581 | rel_code = ICMP_REDIR_HOST; | |
c4d3efaf YK |
582 | default: |
583 | return 0; | |
584 | } | |
585 | ||
586 | if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) | |
587 | return 0; | |
588 | ||
589 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
590 | if (!skb2) | |
591 | return 0; | |
592 | ||
adf30907 ED |
593 | skb_dst_drop(skb2); |
594 | ||
c4d3efaf | 595 | skb_pull(skb2, offset); |
c1d2bbe1 | 596 | skb_reset_network_header(skb2); |
eddc9ec5 | 597 | eiph = ip_hdr(skb2); |
c4d3efaf YK |
598 | |
599 | /* Try to guess incoming interface */ | |
31e4543d | 600 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, |
78fbfd8a DM |
601 | eiph->saddr, 0, |
602 | 0, 0, | |
603 | IPPROTO_IPIP, RT_TOS(eiph->tos), 0); | |
b23dd4fe | 604 | if (IS_ERR(rt)) |
c4d3efaf YK |
605 | goto out; |
606 | ||
d8d1f30b | 607 | skb2->dev = rt->dst.dev; |
c4d3efaf YK |
608 | |
609 | /* route "incoming" packet */ | |
610 | if (rt->rt_flags & RTCF_LOCAL) { | |
611 | ip_rt_put(rt); | |
612 | rt = NULL; | |
31e4543d | 613 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, |
78fbfd8a DM |
614 | eiph->daddr, eiph->saddr, |
615 | 0, 0, | |
616 | IPPROTO_IPIP, | |
617 | RT_TOS(eiph->tos), 0); | |
b23dd4fe | 618 | if (IS_ERR(rt) || |
d8d1f30b | 619 | rt->dst.dev->type != ARPHRD_TUNNEL) { |
b23dd4fe DM |
620 | if (!IS_ERR(rt)) |
621 | ip_rt_put(rt); | |
c4d3efaf YK |
622 | goto out; |
623 | } | |
b23dd4fe | 624 | skb_dst_set(skb2, &rt->dst); |
c4d3efaf YK |
625 | } else { |
626 | ip_rt_put(rt); | |
627 | if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, | |
628 | skb2->dev) || | |
adf30907 | 629 | skb_dst(skb2)->dev->type != ARPHRD_TUNNEL) |
c4d3efaf YK |
630 | goto out; |
631 | } | |
632 | ||
633 | /* change mtu on this route */ | |
634 | if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { | |
adf30907 | 635 | if (rel_info > dst_mtu(skb_dst(skb2))) |
c4d3efaf YK |
636 | goto out; |
637 | ||
6700c270 | 638 | skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2, rel_info); |
c4d3efaf | 639 | } |
1ed5c48f | 640 | if (rel_type == ICMP_REDIRECT) |
6700c270 | 641 | skb_dst(skb2)->ops->redirect(skb_dst(skb2), NULL, skb2); |
c4d3efaf | 642 | |
704eae1f | 643 | icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); |
c4d3efaf YK |
644 | |
645 | out: | |
646 | kfree_skb(skb2); | |
647 | return 0; | |
648 | } | |
649 | ||
e490d1d8 YK |
650 | static int |
651 | ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 652 | u8 type, u8 code, int offset, __be32 info) |
e490d1d8 YK |
653 | { |
654 | int rel_msg = 0; | |
d5fdd6ba BH |
655 | u8 rel_type = type; |
656 | u8 rel_code = code; | |
704eae1f | 657 | __u32 rel_info = ntohl(info); |
e490d1d8 YK |
658 | int err; |
659 | ||
502b0935 YK |
660 | err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, |
661 | &rel_msg, &rel_info, offset); | |
e490d1d8 YK |
662 | if (err < 0) |
663 | return err; | |
664 | ||
665 | if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { | |
1da177e4 LT |
666 | struct rt6_info *rt; |
667 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
305d4b3c | 668 | |
1da177e4 | 669 | if (!skb2) |
e490d1d8 | 670 | return 0; |
1da177e4 | 671 | |
adf30907 | 672 | skb_dst_drop(skb2); |
1da177e4 | 673 | skb_pull(skb2, offset); |
c1d2bbe1 | 674 | skb_reset_network_header(skb2); |
1da177e4 LT |
675 | |
676 | /* Try to guess incoming interface */ | |
2f7f54b7 PE |
677 | rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, |
678 | NULL, 0, 0); | |
1da177e4 | 679 | |
d1918542 DM |
680 | if (rt && rt->dst.dev) |
681 | skb2->dev = rt->dst.dev; | |
1da177e4 | 682 | |
3ffe533c | 683 | icmpv6_send(skb2, rel_type, rel_code, rel_info); |
1da177e4 | 684 | |
94e187c0 | 685 | ip6_rt_put(rt); |
1da177e4 LT |
686 | |
687 | kfree_skb(skb2); | |
688 | } | |
e490d1d8 YK |
689 | |
690 | return 0; | |
1da177e4 LT |
691 | } |
692 | ||
f4e0b4c5 ND |
693 | static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
694 | const struct ipv6hdr *ipv6h, | |
695 | struct sk_buff *skb) | |
c4d3efaf YK |
696 | { |
697 | __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; | |
698 | ||
699 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) | |
eddc9ec5 | 700 | ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); |
c4d3efaf | 701 | |
f4e0b4c5 | 702 | return IP6_ECN_decapsulate(ipv6h, skb); |
c4d3efaf YK |
703 | } |
704 | ||
f4e0b4c5 ND |
705 | static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
706 | const struct ipv6hdr *ipv6h, | |
707 | struct sk_buff *skb) | |
1da177e4 | 708 | { |
8359925b | 709 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) |
29bb43b4 | 710 | ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); |
1da177e4 | 711 | |
f4e0b4c5 | 712 | return IP6_ECN_decapsulate(ipv6h, skb); |
1da177e4 | 713 | } |
8359925b | 714 | |
c12b395a | 715 | __u32 ip6_tnl_get_cap(struct ip6_tnl *t, |
d0087b29 VN |
716 | const struct in6_addr *laddr, |
717 | const struct in6_addr *raddr) | |
718 | { | |
c12b395a | 719 | struct __ip6_tnl_parm *p = &t->parms; |
d0087b29 VN |
720 | int ltype = ipv6_addr_type(laddr); |
721 | int rtype = ipv6_addr_type(raddr); | |
722 | __u32 flags = 0; | |
723 | ||
724 | if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) { | |
725 | flags = IP6_TNL_F_CAP_PER_PACKET; | |
726 | } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
727 | rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
728 | !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && | |
729 | (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { | |
730 | if (ltype&IPV6_ADDR_UNICAST) | |
731 | flags |= IP6_TNL_F_CAP_XMIT; | |
732 | if (rtype&IPV6_ADDR_UNICAST) | |
733 | flags |= IP6_TNL_F_CAP_RCV; | |
734 | } | |
735 | return flags; | |
736 | } | |
c12b395a | 737 | EXPORT_SYMBOL(ip6_tnl_get_cap); |
d0087b29 | 738 | |
f1a28eab | 739 | /* called with rcu_read_lock() */ |
c12b395a | 740 | int ip6_tnl_rcv_ctl(struct ip6_tnl *t, |
d0087b29 VN |
741 | const struct in6_addr *laddr, |
742 | const struct in6_addr *raddr) | |
09c6bbf0 | 743 | { |
c12b395a | 744 | struct __ip6_tnl_parm *p = &t->parms; |
09c6bbf0 | 745 | int ret = 0; |
0bd87628 | 746 | struct net *net = t->net; |
09c6bbf0 | 747 | |
d0087b29 VN |
748 | if ((p->flags & IP6_TNL_F_CAP_RCV) || |
749 | ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && | |
750 | (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) { | |
1ab1457c | 751 | struct net_device *ldev = NULL; |
09c6bbf0 VN |
752 | |
753 | if (p->link) | |
f1a28eab | 754 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 755 | |
d0087b29 VN |
756 | if ((ipv6_addr_is_multicast(laddr) || |
757 | likely(ipv6_chk_addr(net, laddr, ldev, 0))) && | |
758 | likely(!ipv6_chk_addr(net, raddr, NULL, 0))) | |
09c6bbf0 | 759 | ret = 1; |
09c6bbf0 VN |
760 | } |
761 | return ret; | |
762 | } | |
c12b395a | 763 | EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl); |
1da177e4 LT |
764 | |
765 | /** | |
3144581c | 766 | * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally |
1da177e4 | 767 | * @skb: received socket buffer |
8359925b YK |
768 | * @protocol: ethernet protocol ID |
769 | * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN | |
1da177e4 LT |
770 | * |
771 | * Return: 0 | |
772 | **/ | |
773 | ||
8359925b | 774 | static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol, |
502b0935 | 775 | __u8 ipproto, |
f4e0b4c5 ND |
776 | int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, |
777 | const struct ipv6hdr *ipv6h, | |
778 | struct sk_buff *skb)) | |
1da177e4 | 779 | { |
1da177e4 | 780 | struct ip6_tnl *t; |
b71d1d42 | 781 | const struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
f4e0b4c5 | 782 | int err; |
1da177e4 | 783 | |
2922bc8a | 784 | rcu_read_lock(); |
1da177e4 | 785 | |
8704ca7e | 786 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, |
2dd02c89 | 787 | &ipv6h->daddr)) != NULL) { |
8560f226 ED |
788 | struct pcpu_tstats *tstats; |
789 | ||
502b0935 | 790 | if (t->parms.proto != ipproto && t->parms.proto != 0) { |
2922bc8a | 791 | rcu_read_unlock(); |
502b0935 YK |
792 | goto discard; |
793 | } | |
794 | ||
1da177e4 | 795 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
2922bc8a | 796 | rcu_read_unlock(); |
50fba2aa | 797 | goto discard; |
1da177e4 LT |
798 | } |
799 | ||
d0087b29 | 800 | if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) { |
3dca02af | 801 | t->dev->stats.rx_dropped++; |
2922bc8a | 802 | rcu_read_unlock(); |
1da177e4 LT |
803 | goto discard; |
804 | } | |
805 | secpath_reset(skb); | |
b0e380b1 | 806 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 807 | skb_reset_network_header(skb); |
8359925b | 808 | skb->protocol = htons(protocol); |
1da177e4 LT |
809 | skb->pkt_type = PACKET_HOST; |
810 | memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); | |
8359925b | 811 | |
f4e0b4c5 ND |
812 | __skb_tunnel_rx(skb, t->dev); |
813 | ||
814 | err = dscp_ecn_decapsulate(t, ipv6h, skb); | |
815 | if (unlikely(err)) { | |
816 | if (log_ecn_error) | |
817 | net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n", | |
818 | &ipv6h->saddr, | |
819 | ipv6_get_dsfield(ipv6h)); | |
820 | if (err > 1) { | |
821 | ++t->dev->stats.rx_frame_errors; | |
822 | ++t->dev->stats.rx_errors; | |
823 | rcu_read_unlock(); | |
824 | goto discard; | |
825 | } | |
826 | } | |
827 | ||
8560f226 ED |
828 | tstats = this_cpu_ptr(t->dev->tstats); |
829 | tstats->rx_packets++; | |
830 | tstats->rx_bytes += skb->len; | |
831 | ||
0bd87628 | 832 | if (!net_eq(t->net, dev_net(t->dev))) |
8b27f277 | 833 | skb_scrub_packet(skb, true); |
0bd87628 | 834 | |
caf586e5 | 835 | netif_rx(skb); |
8990f468 | 836 | |
2922bc8a | 837 | rcu_read_unlock(); |
1da177e4 LT |
838 | return 0; |
839 | } | |
2922bc8a | 840 | rcu_read_unlock(); |
1da177e4 | 841 | return 1; |
50fba2aa HX |
842 | |
843 | discard: | |
844 | kfree_skb(skb); | |
845 | return 0; | |
1da177e4 LT |
846 | } |
847 | ||
c4d3efaf YK |
848 | static int ip4ip6_rcv(struct sk_buff *skb) |
849 | { | |
502b0935 YK |
850 | return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP, |
851 | ip4ip6_dscp_ecn_decapsulate); | |
c4d3efaf YK |
852 | } |
853 | ||
8359925b YK |
854 | static int ip6ip6_rcv(struct sk_buff *skb) |
855 | { | |
502b0935 YK |
856 | return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6, |
857 | ip6ip6_dscp_ecn_decapsulate); | |
8359925b YK |
858 | } |
859 | ||
6fb32dde VN |
860 | struct ipv6_tel_txoption { |
861 | struct ipv6_txoptions ops; | |
862 | __u8 dst_opt[8]; | |
863 | }; | |
1da177e4 | 864 | |
6fb32dde VN |
865 | static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) |
866 | { | |
867 | memset(opt, 0, sizeof(struct ipv6_tel_txoption)); | |
1da177e4 | 868 | |
6fb32dde VN |
869 | opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; |
870 | opt->dst_opt[3] = 1; | |
871 | opt->dst_opt[4] = encap_limit; | |
872 | opt->dst_opt[5] = IPV6_TLV_PADN; | |
873 | opt->dst_opt[6] = 1; | |
1da177e4 | 874 | |
6fb32dde VN |
875 | opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; |
876 | opt->ops.opt_nflen = 8; | |
1da177e4 LT |
877 | } |
878 | ||
879 | /** | |
3144581c | 880 | * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own |
1da177e4 | 881 | * @t: the outgoing tunnel device |
1ab1457c | 882 | * @hdr: IPv6 header from the incoming packet |
1da177e4 LT |
883 | * |
884 | * Description: | |
1ab1457c | 885 | * Avoid trivial tunneling loop by checking that tunnel exit-point |
1da177e4 LT |
886 | * doesn't match source of incoming packet. |
887 | * | |
1ab1457c | 888 | * Return: |
1da177e4 LT |
889 | * 1 if conflict, |
890 | * 0 else | |
891 | **/ | |
892 | ||
92113bfd | 893 | static inline bool |
b71d1d42 | 894 | ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) |
1da177e4 LT |
895 | { |
896 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
897 | } | |
898 | ||
c12b395a | 899 | int ip6_tnl_xmit_ctl(struct ip6_tnl *t) |
09c6bbf0 | 900 | { |
c12b395a | 901 | struct __ip6_tnl_parm *p = &t->parms; |
09c6bbf0 | 902 | int ret = 0; |
0bd87628 | 903 | struct net *net = t->net; |
09c6bbf0 | 904 | |
1ab1457c | 905 | if (p->flags & IP6_TNL_F_CAP_XMIT) { |
09c6bbf0 VN |
906 | struct net_device *ldev = NULL; |
907 | ||
f1a28eab | 908 | rcu_read_lock(); |
09c6bbf0 | 909 | if (p->link) |
f1a28eab | 910 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 911 | |
2f7f54b7 | 912 | if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0))) |
f3213831 JP |
913 | pr_warn("%s xmit: Local address not yet configured!\n", |
914 | p->name); | |
09c6bbf0 | 915 | else if (!ipv6_addr_is_multicast(&p->raddr) && |
2f7f54b7 | 916 | unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0))) |
f3213831 JP |
917 | pr_warn("%s xmit: Routing loop! Remote address found on this node!\n", |
918 | p->name); | |
09c6bbf0 VN |
919 | else |
920 | ret = 1; | |
f1a28eab | 921 | rcu_read_unlock(); |
09c6bbf0 VN |
922 | } |
923 | return ret; | |
924 | } | |
c12b395a | 925 | EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl); |
926 | ||
1da177e4 | 927 | /** |
61ec2aec | 928 | * ip6_tnl_xmit2 - encapsulate packet and send |
1da177e4 | 929 | * @skb: the outgoing socket buffer |
1ab1457c | 930 | * @dev: the outgoing tunnel device |
61ec2aec YK |
931 | * @dsfield: dscp code for outer header |
932 | * @fl: flow of tunneled packet | |
933 | * @encap_limit: encapsulation limit | |
934 | * @pmtu: Path MTU is stored if packet is too big | |
1da177e4 LT |
935 | * |
936 | * Description: | |
937 | * Build new header and do some sanity checks on the packet before sending | |
938 | * it. | |
939 | * | |
1ab1457c | 940 | * Return: |
c4d3efaf | 941 | * 0 on success |
61ec2aec YK |
942 | * -1 fail |
943 | * %-EMSGSIZE message too big. return mtu in this case. | |
1da177e4 LT |
944 | **/ |
945 | ||
61ec2aec YK |
946 | static int ip6_tnl_xmit2(struct sk_buff *skb, |
947 | struct net_device *dev, | |
948 | __u8 dsfield, | |
4c9483b2 | 949 | struct flowi6 *fl6, |
61ec2aec YK |
950 | int encap_limit, |
951 | __u32 *pmtu) | |
1da177e4 | 952 | { |
2941a486 | 953 | struct ip6_tnl *t = netdev_priv(dev); |
0bd87628 | 954 | struct net *net = t->net; |
3dca02af | 955 | struct net_device_stats *stats = &t->dev->stats; |
0660e03f | 956 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
6fb32dde | 957 | struct ipv6_tel_txoption opt; |
d24f22f3 | 958 | struct dst_entry *dst = NULL, *ndst = NULL; |
1da177e4 LT |
959 | struct net_device *tdev; |
960 | int mtu; | |
c2636b4d | 961 | unsigned int max_headroom = sizeof(struct ipv6hdr); |
1da177e4 | 962 | u8 proto; |
61ec2aec | 963 | int err = -1; |
1da177e4 | 964 | |
d24f22f3 ED |
965 | if (!fl6->flowi6_mark) |
966 | dst = ip6_tnl_dst_check(t); | |
89b02126 ED |
967 | if (!dst) { |
968 | ndst = ip6_route_output(net, NULL, fl6); | |
1da177e4 | 969 | |
89b02126 | 970 | if (ndst->error) |
a57ebc90 | 971 | goto tx_err_link_failure; |
89b02126 ED |
972 | ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0); |
973 | if (IS_ERR(ndst)) { | |
974 | err = PTR_ERR(ndst); | |
975 | ndst = NULL; | |
452edd59 DM |
976 | goto tx_err_link_failure; |
977 | } | |
89b02126 | 978 | dst = ndst; |
a57ebc90 | 979 | } |
1da177e4 LT |
980 | |
981 | tdev = dst->dev; | |
982 | ||
983 | if (tdev == dev) { | |
984 | stats->collisions++; | |
e87cc472 JP |
985 | net_warn_ratelimited("%s: Local routing loop detected!\n", |
986 | t->parms.name); | |
1da177e4 LT |
987 | goto tx_err_dst_release; |
988 | } | |
989 | mtu = dst_mtu(dst) - sizeof (*ipv6h); | |
6fb32dde | 990 | if (encap_limit >= 0) { |
1da177e4 LT |
991 | max_headroom += 8; |
992 | mtu -= 8; | |
993 | } | |
994 | if (mtu < IPV6_MIN_MTU) | |
995 | mtu = IPV6_MIN_MTU; | |
adf30907 | 996 | if (skb_dst(skb)) |
6700c270 | 997 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); |
1da177e4 | 998 | if (skb->len > mtu) { |
61ec2aec YK |
999 | *pmtu = mtu; |
1000 | err = -EMSGSIZE; | |
1da177e4 LT |
1001 | goto tx_err_dst_release; |
1002 | } | |
1003 | ||
0bd87628 | 1004 | if (!net_eq(t->net, dev_net(dev))) |
8b27f277 | 1005 | skb_scrub_packet(skb, true); |
0bd87628 | 1006 | |
1da177e4 LT |
1007 | /* |
1008 | * Okay, now see if we can stuff it in the buffer as-is. | |
1009 | */ | |
1010 | max_headroom += LL_RESERVED_SPACE(tdev); | |
1ab1457c | 1011 | |
cfbba49d PM |
1012 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
1013 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 | 1014 | struct sk_buff *new_skb; |
1ab1457c | 1015 | |
1da177e4 LT |
1016 | if (!(new_skb = skb_realloc_headroom(skb, max_headroom))) |
1017 | goto tx_err_dst_release; | |
1018 | ||
1019 | if (skb->sk) | |
1020 | skb_set_owner_w(new_skb, skb->sk); | |
9ff26449 | 1021 | consume_skb(skb); |
1da177e4 LT |
1022 | skb = new_skb; |
1023 | } | |
adf30907 | 1024 | skb_dst_drop(skb); |
d24f22f3 ED |
1025 | if (fl6->flowi6_mark) { |
1026 | skb_dst_set(skb, dst); | |
1027 | ndst = NULL; | |
1028 | } else { | |
1029 | skb_dst_set_noref(skb, dst); | |
1030 | } | |
b0e380b1 | 1031 | skb->transport_header = skb->network_header; |
1da177e4 | 1032 | |
4c9483b2 | 1033 | proto = fl6->flowi6_proto; |
6fb32dde VN |
1034 | if (encap_limit >= 0) { |
1035 | init_tel_txopt(&opt, encap_limit); | |
1036 | ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); | |
1037 | } | |
e2d1bca7 ACM |
1038 | skb_push(skb, sizeof(struct ipv6hdr)); |
1039 | skb_reset_network_header(skb); | |
0660e03f | 1040 | ipv6h = ipv6_hdr(skb); |
3e4e4c1f | 1041 | ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), fl6->flowlabel); |
1da177e4 LT |
1042 | ipv6h->hop_limit = t->parms.hop_limit; |
1043 | ipv6h->nexthdr = proto; | |
4e3fd7a0 AD |
1044 | ipv6h->saddr = fl6->saddr; |
1045 | ipv6h->daddr = fl6->daddr; | |
e8f72ea4 | 1046 | ip6tunnel_xmit(skb, dev); |
89b02126 ED |
1047 | if (ndst) |
1048 | ip6_tnl_dst_store(t, ndst); | |
1da177e4 LT |
1049 | return 0; |
1050 | tx_err_link_failure: | |
1051 | stats->tx_carrier_errors++; | |
1052 | dst_link_failure(skb); | |
1053 | tx_err_dst_release: | |
89b02126 | 1054 | dst_release(ndst); |
61ec2aec YK |
1055 | return err; |
1056 | } | |
1057 | ||
c4d3efaf YK |
1058 | static inline int |
1059 | ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1060 | { | |
1061 | struct ip6_tnl *t = netdev_priv(dev); | |
b71d1d42 | 1062 | const struct iphdr *iph = ip_hdr(skb); |
c4d3efaf | 1063 | int encap_limit = -1; |
4c9483b2 | 1064 | struct flowi6 fl6; |
c4d3efaf YK |
1065 | __u8 dsfield; |
1066 | __u32 mtu; | |
1067 | int err; | |
1068 | ||
502b0935 YK |
1069 | if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) || |
1070 | !ip6_tnl_xmit_ctl(t)) | |
c4d3efaf YK |
1071 | return -1; |
1072 | ||
1073 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1074 | encap_limit = t->parms.encap_limit; | |
1075 | ||
4c9483b2 DM |
1076 | memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6)); |
1077 | fl6.flowi6_proto = IPPROTO_IPIP; | |
c4d3efaf YK |
1078 | |
1079 | dsfield = ipv4_get_dsfield(iph); | |
1080 | ||
d24f22f3 | 1081 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
4c9483b2 | 1082 | fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) |
b77f2fa6 | 1083 | & IPV6_TCLASS_MASK; |
d24f22f3 ED |
1084 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
1085 | fl6.flowi6_mark = skb->mark; | |
c4d3efaf | 1086 | |
4c9483b2 | 1087 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); |
c4d3efaf YK |
1088 | if (err != 0) { |
1089 | /* XXX: send ICMP error even if DF is not set. */ | |
1090 | if (err == -EMSGSIZE) | |
1091 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
1092 | htonl(mtu)); | |
1093 | return -1; | |
1094 | } | |
1095 | ||
1096 | return 0; | |
1097 | } | |
1098 | ||
61ec2aec YK |
1099 | static inline int |
1100 | ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1101 | { | |
1102 | struct ip6_tnl *t = netdev_priv(dev); | |
0660e03f | 1103 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
61ec2aec YK |
1104 | int encap_limit = -1; |
1105 | __u16 offset; | |
4c9483b2 | 1106 | struct flowi6 fl6; |
61ec2aec YK |
1107 | __u8 dsfield; |
1108 | __u32 mtu; | |
1109 | int err; | |
1110 | ||
502b0935 YK |
1111 | if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) || |
1112 | !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h)) | |
61ec2aec YK |
1113 | return -1; |
1114 | ||
c12b395a | 1115 | offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); |
d56f90a7 | 1116 | if (offset > 0) { |
61ec2aec | 1117 | struct ipv6_tlv_tnl_enc_lim *tel; |
d56f90a7 | 1118 | tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; |
61ec2aec YK |
1119 | if (tel->encap_limit == 0) { |
1120 | icmpv6_send(skb, ICMPV6_PARAMPROB, | |
3ffe533c | 1121 | ICMPV6_HDR_FIELD, offset + 2); |
61ec2aec YK |
1122 | return -1; |
1123 | } | |
1124 | encap_limit = tel->encap_limit - 1; | |
1125 | } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1126 | encap_limit = t->parms.encap_limit; | |
1127 | ||
4c9483b2 DM |
1128 | memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6)); |
1129 | fl6.flowi6_proto = IPPROTO_IPV6; | |
61ec2aec YK |
1130 | |
1131 | dsfield = ipv6_get_dsfield(ipv6h); | |
d24f22f3 | 1132 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
4c9483b2 | 1133 | fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); |
d24f22f3 | 1134 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) |
4c9483b2 | 1135 | fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK); |
d24f22f3 ED |
1136 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
1137 | fl6.flowi6_mark = skb->mark; | |
61ec2aec | 1138 | |
4c9483b2 | 1139 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); |
61ec2aec YK |
1140 | if (err != 0) { |
1141 | if (err == -EMSGSIZE) | |
3ffe533c | 1142 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
61ec2aec YK |
1143 | return -1; |
1144 | } | |
1145 | ||
1146 | return 0; | |
1147 | } | |
1148 | ||
6fef4c0c | 1149 | static netdev_tx_t |
61ec2aec YK |
1150 | ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) |
1151 | { | |
1152 | struct ip6_tnl *t = netdev_priv(dev); | |
3dca02af | 1153 | struct net_device_stats *stats = &t->dev->stats; |
61ec2aec YK |
1154 | int ret; |
1155 | ||
61ec2aec | 1156 | switch (skb->protocol) { |
60678040 | 1157 | case htons(ETH_P_IP): |
c4d3efaf YK |
1158 | ret = ip4ip6_tnl_xmit(skb, dev); |
1159 | break; | |
60678040 | 1160 | case htons(ETH_P_IPV6): |
61ec2aec YK |
1161 | ret = ip6ip6_tnl_xmit(skb, dev); |
1162 | break; | |
1163 | default: | |
1164 | goto tx_err; | |
1165 | } | |
1166 | ||
1167 | if (ret < 0) | |
1168 | goto tx_err; | |
1169 | ||
6ed10654 | 1170 | return NETDEV_TX_OK; |
61ec2aec | 1171 | |
1da177e4 LT |
1172 | tx_err: |
1173 | stats->tx_errors++; | |
1174 | stats->tx_dropped++; | |
1175 | kfree_skb(skb); | |
6ed10654 | 1176 | return NETDEV_TX_OK; |
1da177e4 LT |
1177 | } |
1178 | ||
3144581c | 1179 | static void ip6_tnl_link_config(struct ip6_tnl *t) |
1da177e4 LT |
1180 | { |
1181 | struct net_device *dev = t->dev; | |
c12b395a | 1182 | struct __ip6_tnl_parm *p = &t->parms; |
4c9483b2 | 1183 | struct flowi6 *fl6 = &t->fl.u.ip6; |
1da177e4 | 1184 | |
3a6d54c5 JP |
1185 | memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); |
1186 | memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
1da177e4 LT |
1187 | |
1188 | /* Set up flowi template */ | |
4e3fd7a0 AD |
1189 | fl6->saddr = p->laddr; |
1190 | fl6->daddr = p->raddr; | |
4c9483b2 DM |
1191 | fl6->flowi6_oif = p->link; |
1192 | fl6->flowlabel = 0; | |
1da177e4 LT |
1193 | |
1194 | if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) | |
4c9483b2 | 1195 | fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; |
1da177e4 | 1196 | if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) |
4c9483b2 | 1197 | fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; |
1da177e4 | 1198 | |
d0087b29 VN |
1199 | p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); |
1200 | p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); | |
1da177e4 LT |
1201 | |
1202 | if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) | |
1203 | dev->flags |= IFF_POINTOPOINT; | |
1204 | else | |
1205 | dev->flags &= ~IFF_POINTOPOINT; | |
1206 | ||
1207 | dev->iflink = p->link; | |
1208 | ||
1209 | if (p->flags & IP6_TNL_F_CAP_XMIT) { | |
305d4b3c VN |
1210 | int strict = (ipv6_addr_type(&p->raddr) & |
1211 | (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); | |
1212 | ||
0bd87628 | 1213 | struct rt6_info *rt = rt6_lookup(t->net, |
2f7f54b7 | 1214 | &p->raddr, &p->laddr, |
305d4b3c | 1215 | p->link, strict); |
1da177e4 LT |
1216 | |
1217 | if (rt == NULL) | |
1218 | return; | |
1219 | ||
d1918542 DM |
1220 | if (rt->dst.dev) { |
1221 | dev->hard_header_len = rt->dst.dev->hard_header_len + | |
1da177e4 LT |
1222 | sizeof (struct ipv6hdr); |
1223 | ||
d1918542 | 1224 | dev->mtu = rt->dst.dev->mtu - sizeof (struct ipv6hdr); |
381601e5 AF |
1225 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
1226 | dev->mtu-=8; | |
1da177e4 LT |
1227 | |
1228 | if (dev->mtu < IPV6_MIN_MTU) | |
1229 | dev->mtu = IPV6_MIN_MTU; | |
1230 | } | |
94e187c0 | 1231 | ip6_rt_put(rt); |
1da177e4 LT |
1232 | } |
1233 | } | |
1234 | ||
1235 | /** | |
3144581c | 1236 | * ip6_tnl_change - update the tunnel parameters |
1da177e4 LT |
1237 | * @t: tunnel to be changed |
1238 | * @p: tunnel configuration parameters | |
1da177e4 LT |
1239 | * |
1240 | * Description: | |
3144581c | 1241 | * ip6_tnl_change() updates the tunnel parameters |
1da177e4 LT |
1242 | **/ |
1243 | ||
1244 | static int | |
c12b395a | 1245 | ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) |
1da177e4 | 1246 | { |
4e3fd7a0 AD |
1247 | t->parms.laddr = p->laddr; |
1248 | t->parms.raddr = p->raddr; | |
1da177e4 LT |
1249 | t->parms.flags = p->flags; |
1250 | t->parms.hop_limit = p->hop_limit; | |
1251 | t->parms.encap_limit = p->encap_limit; | |
1252 | t->parms.flowinfo = p->flowinfo; | |
8181b8c1 | 1253 | t->parms.link = p->link; |
502b0935 | 1254 | t->parms.proto = p->proto; |
0c088890 | 1255 | ip6_tnl_dst_reset(t); |
3144581c | 1256 | ip6_tnl_link_config(t); |
1da177e4 LT |
1257 | return 0; |
1258 | } | |
1259 | ||
0b112457 ND |
1260 | static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) |
1261 | { | |
0bd87628 | 1262 | struct net *net = t->net; |
0b112457 ND |
1263 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1264 | int err; | |
1265 | ||
1266 | ip6_tnl_unlink(ip6n, t); | |
1267 | synchronize_net(); | |
1268 | err = ip6_tnl_change(t, p); | |
1269 | ip6_tnl_link(ip6n, t); | |
1270 | netdev_state_change(t->dev); | |
1271 | return err; | |
1272 | } | |
1273 | ||
c12b395a | 1274 | static void |
1275 | ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u) | |
1276 | { | |
1277 | p->laddr = u->laddr; | |
1278 | p->raddr = u->raddr; | |
1279 | p->flags = u->flags; | |
1280 | p->hop_limit = u->hop_limit; | |
1281 | p->encap_limit = u->encap_limit; | |
1282 | p->flowinfo = u->flowinfo; | |
1283 | p->link = u->link; | |
1284 | p->proto = u->proto; | |
1285 | memcpy(p->name, u->name, sizeof(u->name)); | |
1286 | } | |
1287 | ||
1288 | static void | |
1289 | ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p) | |
1290 | { | |
1291 | u->laddr = p->laddr; | |
1292 | u->raddr = p->raddr; | |
1293 | u->flags = p->flags; | |
1294 | u->hop_limit = p->hop_limit; | |
1295 | u->encap_limit = p->encap_limit; | |
1296 | u->flowinfo = p->flowinfo; | |
1297 | u->link = p->link; | |
1298 | u->proto = p->proto; | |
1299 | memcpy(u->name, p->name, sizeof(u->name)); | |
1300 | } | |
1301 | ||
1da177e4 | 1302 | /** |
3144581c | 1303 | * ip6_tnl_ioctl - configure ipv6 tunnels from userspace |
1da177e4 LT |
1304 | * @dev: virtual device associated with tunnel |
1305 | * @ifr: parameters passed from userspace | |
1306 | * @cmd: command to be performed | |
1307 | * | |
1308 | * Description: | |
3144581c | 1309 | * ip6_tnl_ioctl() is used for managing IPv6 tunnels |
1ab1457c | 1310 | * from userspace. |
1da177e4 LT |
1311 | * |
1312 | * The possible commands are the following: | |
1313 | * %SIOCGETTUNNEL: get tunnel parameters for device | |
1314 | * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters | |
1315 | * %SIOCCHGTUNNEL: change tunnel parameters to those given | |
1316 | * %SIOCDELTUNNEL: delete tunnel | |
1317 | * | |
1ab1457c | 1318 | * The fallback device "ip6tnl0", created during module |
1da177e4 LT |
1319 | * initialization, can be used for creating other tunnel devices. |
1320 | * | |
1321 | * Return: | |
1322 | * 0 on success, | |
1323 | * %-EFAULT if unable to copy data to or from userspace, | |
1324 | * %-EPERM if current process hasn't %CAP_NET_ADMIN set | |
1325 | * %-EINVAL if passed tunnel parameters are invalid, | |
1326 | * %-EEXIST if changing a tunnel's parameters would cause a conflict | |
1327 | * %-ENODEV if attempting to change or delete a nonexisting device | |
1328 | **/ | |
1329 | ||
1330 | static int | |
3144581c | 1331 | ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
1da177e4 LT |
1332 | { |
1333 | int err = 0; | |
1da177e4 | 1334 | struct ip6_tnl_parm p; |
c12b395a | 1335 | struct __ip6_tnl_parm p1; |
1da177e4 | 1336 | struct ip6_tnl *t = NULL; |
2dd02c89 PE |
1337 | struct net *net = dev_net(dev); |
1338 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1da177e4 LT |
1339 | |
1340 | switch (cmd) { | |
1341 | case SIOCGETTUNNEL: | |
15820e12 | 1342 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 | 1343 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) { |
1da177e4 LT |
1344 | err = -EFAULT; |
1345 | break; | |
1346 | } | |
c12b395a | 1347 | ip6_tnl_parm_from_user(&p1, &p); |
1348 | t = ip6_tnl_locate(net, &p1, 0); | |
5ef5d6c5 DC |
1349 | } else { |
1350 | memset(&p, 0, sizeof(p)); | |
567131a7 VN |
1351 | } |
1352 | if (t == NULL) | |
2941a486 | 1353 | t = netdev_priv(dev); |
c12b395a | 1354 | ip6_tnl_parm_to_user(&p, &t->parms); |
1da177e4 LT |
1355 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) { |
1356 | err = -EFAULT; | |
1357 | } | |
1358 | break; | |
1359 | case SIOCADDTUNNEL: | |
1360 | case SIOCCHGTUNNEL: | |
1361 | err = -EPERM; | |
af31f412 | 1362 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 1363 | break; |
567131a7 VN |
1364 | err = -EFAULT; |
1365 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1366 | break; |
567131a7 | 1367 | err = -EINVAL; |
502b0935 YK |
1368 | if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && |
1369 | p.proto != 0) | |
1da177e4 | 1370 | break; |
c12b395a | 1371 | ip6_tnl_parm_from_user(&p1, &p); |
1372 | t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL); | |
15820e12 | 1373 | if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) { |
567131a7 VN |
1374 | if (t != NULL) { |
1375 | if (t->dev != dev) { | |
1376 | err = -EEXIST; | |
1377 | break; | |
1378 | } | |
1379 | } else | |
1380 | t = netdev_priv(dev); | |
1381 | ||
0b112457 | 1382 | err = ip6_tnl_update(t, &p1); |
1da177e4 | 1383 | } |
567131a7 | 1384 | if (t) { |
1da177e4 | 1385 | err = 0; |
c12b395a | 1386 | ip6_tnl_parm_to_user(&p, &t->parms); |
1387 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
567131a7 VN |
1388 | err = -EFAULT; |
1389 | ||
1390 | } else | |
1391 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1da177e4 LT |
1392 | break; |
1393 | case SIOCDELTUNNEL: | |
1394 | err = -EPERM; | |
af31f412 | 1395 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1396 | break; |
1397 | ||
15820e12 | 1398 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 VN |
1399 | err = -EFAULT; |
1400 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1401 | break; |
567131a7 | 1402 | err = -ENOENT; |
c12b395a | 1403 | ip6_tnl_parm_from_user(&p1, &p); |
1404 | t = ip6_tnl_locate(net, &p1, 0); | |
1405 | if (t == NULL) | |
1da177e4 | 1406 | break; |
567131a7 | 1407 | err = -EPERM; |
15820e12 | 1408 | if (t->dev == ip6n->fb_tnl_dev) |
1da177e4 | 1409 | break; |
567131a7 | 1410 | dev = t->dev; |
1da177e4 | 1411 | } |
22f8cde5 SH |
1412 | err = 0; |
1413 | unregister_netdevice(dev); | |
1da177e4 LT |
1414 | break; |
1415 | default: | |
1416 | err = -EINVAL; | |
1417 | } | |
1418 | return err; | |
1419 | } | |
1420 | ||
1da177e4 | 1421 | /** |
3144581c | 1422 | * ip6_tnl_change_mtu - change mtu manually for tunnel device |
1da177e4 LT |
1423 | * @dev: virtual device associated with tunnel |
1424 | * @new_mtu: the new mtu | |
1425 | * | |
1426 | * Return: | |
1427 | * 0 on success, | |
1428 | * %-EINVAL if mtu too small | |
1429 | **/ | |
1430 | ||
1431 | static int | |
3144581c | 1432 | ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) |
1da177e4 LT |
1433 | { |
1434 | if (new_mtu < IPV6_MIN_MTU) { | |
1435 | return -EINVAL; | |
1436 | } | |
1437 | dev->mtu = new_mtu; | |
1438 | return 0; | |
1439 | } | |
1440 | ||
1326c3d5 SH |
1441 | |
1442 | static const struct net_device_ops ip6_tnl_netdev_ops = { | |
8560f226 | 1443 | .ndo_uninit = ip6_tnl_dev_uninit, |
1326c3d5 | 1444 | .ndo_start_xmit = ip6_tnl_xmit, |
8560f226 | 1445 | .ndo_do_ioctl = ip6_tnl_ioctl, |
1326c3d5 | 1446 | .ndo_change_mtu = ip6_tnl_change_mtu, |
8560f226 | 1447 | .ndo_get_stats = ip6_get_stats, |
1326c3d5 SH |
1448 | }; |
1449 | ||
8560f226 | 1450 | |
1da177e4 | 1451 | /** |
3144581c | 1452 | * ip6_tnl_dev_setup - setup virtual tunnel device |
1da177e4 LT |
1453 | * @dev: virtual device associated with tunnel |
1454 | * | |
1455 | * Description: | |
1456 | * Initialize function pointers and device parameters | |
1457 | **/ | |
1458 | ||
3144581c | 1459 | static void ip6_tnl_dev_setup(struct net_device *dev) |
1da177e4 | 1460 | { |
381601e5 AF |
1461 | struct ip6_tnl *t; |
1462 | ||
1326c3d5 | 1463 | dev->netdev_ops = &ip6_tnl_netdev_ops; |
8560f226 | 1464 | dev->destructor = ip6_dev_free; |
1da177e4 LT |
1465 | |
1466 | dev->type = ARPHRD_TUNNEL6; | |
1467 | dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr); | |
1468 | dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr); | |
381601e5 AF |
1469 | t = netdev_priv(dev); |
1470 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1471 | dev->mtu-=8; | |
1da177e4 LT |
1472 | dev->flags |= IFF_NOARP; |
1473 | dev->addr_len = sizeof(struct in6_addr); | |
7e223de8 | 1474 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
e837735e ND |
1475 | /* This perm addr will be used as interface identifier by IPv6 */ |
1476 | dev->addr_assign_type = NET_ADDR_RANDOM; | |
1477 | eth_random_addr(dev->perm_addr); | |
1da177e4 LT |
1478 | } |
1479 | ||
1480 | ||
1481 | /** | |
3144581c | 1482 | * ip6_tnl_dev_init_gen - general initializer for all tunnel devices |
1da177e4 LT |
1483 | * @dev: virtual device associated with tunnel |
1484 | **/ | |
1485 | ||
8560f226 | 1486 | static inline int |
3144581c | 1487 | ip6_tnl_dev_init_gen(struct net_device *dev) |
1da177e4 | 1488 | { |
2941a486 | 1489 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 | 1490 | |
1da177e4 | 1491 | t->dev = dev; |
0bd87628 | 1492 | t->net = dev_net(dev); |
8560f226 ED |
1493 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
1494 | if (!dev->tstats) | |
1495 | return -ENOMEM; | |
1496 | return 0; | |
1da177e4 LT |
1497 | } |
1498 | ||
1499 | /** | |
3144581c | 1500 | * ip6_tnl_dev_init - initializer for all non fallback tunnel devices |
1da177e4 LT |
1501 | * @dev: virtual device associated with tunnel |
1502 | **/ | |
1503 | ||
8560f226 | 1504 | static int ip6_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1505 | { |
2941a486 | 1506 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 ED |
1507 | int err = ip6_tnl_dev_init_gen(dev); |
1508 | ||
1509 | if (err) | |
1510 | return err; | |
3144581c | 1511 | ip6_tnl_link_config(t); |
8560f226 | 1512 | return 0; |
1da177e4 LT |
1513 | } |
1514 | ||
1515 | /** | |
3144581c | 1516 | * ip6_fb_tnl_dev_init - initializer for fallback tunnel device |
1da177e4 LT |
1517 | * @dev: fallback device |
1518 | * | |
1519 | * Return: 0 | |
1520 | **/ | |
1521 | ||
8560f226 | 1522 | static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1523 | { |
2941a486 | 1524 | struct ip6_tnl *t = netdev_priv(dev); |
3e6c9fb5 PE |
1525 | struct net *net = dev_net(dev); |
1526 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
8560f226 ED |
1527 | int err = ip6_tnl_dev_init_gen(dev); |
1528 | ||
1529 | if (err) | |
1530 | return err; | |
3e6c9fb5 | 1531 | |
502b0935 | 1532 | t->parms.proto = IPPROTO_IPV6; |
1da177e4 | 1533 | dev_hold(dev); |
d0087b29 VN |
1534 | |
1535 | ip6_tnl_link_config(t); | |
1536 | ||
cf778b00 | 1537 | rcu_assign_pointer(ip6n->tnls_wc[0], t); |
8560f226 | 1538 | return 0; |
1da177e4 LT |
1539 | } |
1540 | ||
0b112457 ND |
1541 | static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[]) |
1542 | { | |
1543 | u8 proto; | |
1544 | ||
1545 | if (!data) | |
1546 | return 0; | |
1547 | ||
1548 | proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1549 | if (proto != IPPROTO_IPV6 && | |
1550 | proto != IPPROTO_IPIP && | |
1551 | proto != 0) | |
1552 | return -EINVAL; | |
1553 | ||
1554 | return 0; | |
1555 | } | |
1556 | ||
1557 | static void ip6_tnl_netlink_parms(struct nlattr *data[], | |
1558 | struct __ip6_tnl_parm *parms) | |
1559 | { | |
1560 | memset(parms, 0, sizeof(*parms)); | |
1561 | ||
1562 | if (!data) | |
1563 | return; | |
1564 | ||
1565 | if (data[IFLA_IPTUN_LINK]) | |
1566 | parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); | |
1567 | ||
1568 | if (data[IFLA_IPTUN_LOCAL]) | |
1569 | nla_memcpy(&parms->laddr, data[IFLA_IPTUN_LOCAL], | |
1570 | sizeof(struct in6_addr)); | |
1571 | ||
1572 | if (data[IFLA_IPTUN_REMOTE]) | |
1573 | nla_memcpy(&parms->raddr, data[IFLA_IPTUN_REMOTE], | |
1574 | sizeof(struct in6_addr)); | |
1575 | ||
1576 | if (data[IFLA_IPTUN_TTL]) | |
1577 | parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]); | |
1578 | ||
1579 | if (data[IFLA_IPTUN_ENCAP_LIMIT]) | |
1580 | parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]); | |
1581 | ||
1582 | if (data[IFLA_IPTUN_FLOWINFO]) | |
1ff05fb7 | 1583 | parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]); |
0b112457 ND |
1584 | |
1585 | if (data[IFLA_IPTUN_FLAGS]) | |
1586 | parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]); | |
1587 | ||
1588 | if (data[IFLA_IPTUN_PROTO]) | |
1589 | parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1590 | } | |
1591 | ||
1592 | static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev, | |
1593 | struct nlattr *tb[], struct nlattr *data[]) | |
1594 | { | |
1595 | struct net *net = dev_net(dev); | |
1596 | struct ip6_tnl *nt; | |
1597 | ||
1598 | nt = netdev_priv(dev); | |
1599 | ip6_tnl_netlink_parms(data, &nt->parms); | |
1600 | ||
1601 | if (ip6_tnl_locate(net, &nt->parms, 0)) | |
1602 | return -EEXIST; | |
1603 | ||
1604 | return ip6_tnl_create2(dev); | |
1605 | } | |
1606 | ||
1607 | static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[], | |
1608 | struct nlattr *data[]) | |
1609 | { | |
0bd87628 | 1610 | struct ip6_tnl *t = netdev_priv(dev); |
0b112457 | 1611 | struct __ip6_tnl_parm p; |
0bd87628 | 1612 | struct net *net = t->net; |
0b112457 ND |
1613 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1614 | ||
1615 | if (dev == ip6n->fb_tnl_dev) | |
1616 | return -EINVAL; | |
1617 | ||
1618 | ip6_tnl_netlink_parms(data, &p); | |
1619 | ||
1620 | t = ip6_tnl_locate(net, &p, 0); | |
1621 | ||
1622 | if (t) { | |
1623 | if (t->dev != dev) | |
1624 | return -EEXIST; | |
1625 | } else | |
1626 | t = netdev_priv(dev); | |
1627 | ||
1628 | return ip6_tnl_update(t, &p); | |
1629 | } | |
1630 | ||
b58d731a | 1631 | static size_t ip6_tnl_get_size(const struct net_device *dev) |
c075b130 ND |
1632 | { |
1633 | return | |
1634 | /* IFLA_IPTUN_LINK */ | |
1635 | nla_total_size(4) + | |
1636 | /* IFLA_IPTUN_LOCAL */ | |
1637 | nla_total_size(sizeof(struct in6_addr)) + | |
1638 | /* IFLA_IPTUN_REMOTE */ | |
1639 | nla_total_size(sizeof(struct in6_addr)) + | |
1640 | /* IFLA_IPTUN_TTL */ | |
1641 | nla_total_size(1) + | |
1642 | /* IFLA_IPTUN_ENCAP_LIMIT */ | |
1643 | nla_total_size(1) + | |
1644 | /* IFLA_IPTUN_FLOWINFO */ | |
1645 | nla_total_size(4) + | |
1646 | /* IFLA_IPTUN_FLAGS */ | |
1647 | nla_total_size(4) + | |
cfa323b6 ND |
1648 | /* IFLA_IPTUN_PROTO */ |
1649 | nla_total_size(1) + | |
c075b130 ND |
1650 | 0; |
1651 | } | |
1652 | ||
b58d731a | 1653 | static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev) |
c075b130 ND |
1654 | { |
1655 | struct ip6_tnl *tunnel = netdev_priv(dev); | |
1656 | struct __ip6_tnl_parm *parm = &tunnel->parms; | |
1657 | ||
1658 | if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || | |
1659 | nla_put(skb, IFLA_IPTUN_LOCAL, sizeof(struct in6_addr), | |
1660 | &parm->raddr) || | |
1661 | nla_put(skb, IFLA_IPTUN_REMOTE, sizeof(struct in6_addr), | |
1662 | &parm->laddr) || | |
1663 | nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) || | |
1664 | nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) || | |
1665 | nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) || | |
cfa323b6 ND |
1666 | nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) || |
1667 | nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto)) | |
c075b130 ND |
1668 | goto nla_put_failure; |
1669 | return 0; | |
1670 | ||
1671 | nla_put_failure: | |
1672 | return -EMSGSIZE; | |
1673 | } | |
1674 | ||
0b112457 ND |
1675 | static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = { |
1676 | [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, | |
1677 | [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) }, | |
1678 | [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) }, | |
1679 | [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, | |
1680 | [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 }, | |
1681 | [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 }, | |
1682 | [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 }, | |
1683 | [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, | |
1684 | }; | |
1685 | ||
c075b130 ND |
1686 | static struct rtnl_link_ops ip6_link_ops __read_mostly = { |
1687 | .kind = "ip6tnl", | |
1688 | .maxtype = IFLA_IPTUN_MAX, | |
0b112457 | 1689 | .policy = ip6_tnl_policy, |
c075b130 | 1690 | .priv_size = sizeof(struct ip6_tnl), |
0b112457 ND |
1691 | .setup = ip6_tnl_dev_setup, |
1692 | .validate = ip6_tnl_validate, | |
1693 | .newlink = ip6_tnl_newlink, | |
1694 | .changelink = ip6_tnl_changelink, | |
b58d731a ND |
1695 | .get_size = ip6_tnl_get_size, |
1696 | .fill_info = ip6_tnl_fill_info, | |
c075b130 ND |
1697 | }; |
1698 | ||
3ff2cfa5 | 1699 | static struct xfrm6_tunnel ip4ip6_handler __read_mostly = { |
c4d3efaf YK |
1700 | .handler = ip4ip6_rcv, |
1701 | .err_handler = ip4ip6_err, | |
1702 | .priority = 1, | |
1703 | }; | |
1704 | ||
3ff2cfa5 | 1705 | static struct xfrm6_tunnel ip6ip6_handler __read_mostly = { |
0303770d PM |
1706 | .handler = ip6ip6_rcv, |
1707 | .err_handler = ip6ip6_err, | |
d2acc347 | 1708 | .priority = 1, |
1da177e4 LT |
1709 | }; |
1710 | ||
2c8c1e72 | 1711 | static void __net_exit ip6_tnl_destroy_tunnels(struct ip6_tnl_net *ip6n) |
3e6c9fb5 | 1712 | { |
0bd87628 ND |
1713 | struct net *net = dev_net(ip6n->fb_tnl_dev); |
1714 | struct net_device *dev, *aux; | |
3e6c9fb5 PE |
1715 | int h; |
1716 | struct ip6_tnl *t; | |
cf4432f5 | 1717 | LIST_HEAD(list); |
3e6c9fb5 | 1718 | |
0bd87628 ND |
1719 | for_each_netdev_safe(net, dev, aux) |
1720 | if (dev->rtnl_link_ops == &ip6_link_ops) | |
1721 | unregister_netdevice_queue(dev, &list); | |
1722 | ||
3e6c9fb5 | 1723 | for (h = 0; h < HASH_SIZE; h++) { |
94767632 | 1724 | t = rtnl_dereference(ip6n->tnls_r_l[h]); |
cf4432f5 | 1725 | while (t != NULL) { |
0bd87628 ND |
1726 | /* If dev is in the same netns, it has already |
1727 | * been added to the list by the previous loop. | |
1728 | */ | |
1729 | if (!net_eq(dev_net(t->dev), net)) | |
1730 | unregister_netdevice_queue(t->dev, &list); | |
94767632 | 1731 | t = rtnl_dereference(t->next); |
cf4432f5 | 1732 | } |
3e6c9fb5 PE |
1733 | } |
1734 | ||
94767632 | 1735 | t = rtnl_dereference(ip6n->tnls_wc[0]); |
cf4432f5 ED |
1736 | unregister_netdevice_queue(t->dev, &list); |
1737 | unregister_netdevice_many(&list); | |
3e6c9fb5 PE |
1738 | } |
1739 | ||
2c8c1e72 | 1740 | static int __net_init ip6_tnl_init_net(struct net *net) |
13eeb8e9 | 1741 | { |
ac31cd3c | 1742 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
731abb9c | 1743 | struct ip6_tnl *t = NULL; |
13eeb8e9 | 1744 | int err; |
13eeb8e9 | 1745 | |
3e6c9fb5 PE |
1746 | ip6n->tnls[0] = ip6n->tnls_wc; |
1747 | ip6n->tnls[1] = ip6n->tnls_r_l; | |
1748 | ||
15820e12 PE |
1749 | err = -ENOMEM; |
1750 | ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", | |
1751 | ip6_tnl_dev_setup); | |
1752 | ||
1753 | if (!ip6n->fb_tnl_dev) | |
1754 | goto err_alloc_dev; | |
be77e593 | 1755 | dev_net_set(ip6n->fb_tnl_dev, net); |
0bd87628 ND |
1756 | /* FB netdevice is special: we have one, and only one per netns. |
1757 | * Allowing to move it to another netns is clearly unsafe. | |
1758 | */ | |
1759 | ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL; | |
15820e12 | 1760 | |
8560f226 ED |
1761 | err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); |
1762 | if (err < 0) | |
1763 | goto err_register; | |
15820e12 PE |
1764 | |
1765 | err = register_netdev(ip6n->fb_tnl_dev); | |
1766 | if (err < 0) | |
1767 | goto err_register; | |
731abb9c JB |
1768 | |
1769 | t = netdev_priv(ip6n->fb_tnl_dev); | |
1770 | ||
1771 | strcpy(t->parms.name, ip6n->fb_tnl_dev->name); | |
13eeb8e9 PE |
1772 | return 0; |
1773 | ||
15820e12 | 1774 | err_register: |
8560f226 | 1775 | ip6_dev_free(ip6n->fb_tnl_dev); |
15820e12 | 1776 | err_alloc_dev: |
13eeb8e9 PE |
1777 | return err; |
1778 | } | |
1779 | ||
2c8c1e72 | 1780 | static void __net_exit ip6_tnl_exit_net(struct net *net) |
13eeb8e9 | 1781 | { |
ac31cd3c | 1782 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
13eeb8e9 | 1783 | |
3e6c9fb5 PE |
1784 | rtnl_lock(); |
1785 | ip6_tnl_destroy_tunnels(ip6n); | |
1786 | rtnl_unlock(); | |
13eeb8e9 PE |
1787 | } |
1788 | ||
1789 | static struct pernet_operations ip6_tnl_net_ops = { | |
1790 | .init = ip6_tnl_init_net, | |
1791 | .exit = ip6_tnl_exit_net, | |
ac31cd3c EB |
1792 | .id = &ip6_tnl_net_id, |
1793 | .size = sizeof(struct ip6_tnl_net), | |
13eeb8e9 PE |
1794 | }; |
1795 | ||
1da177e4 LT |
1796 | /** |
1797 | * ip6_tunnel_init - register protocol and reserve needed resources | |
1798 | * | |
1799 | * Return: 0 on success | |
1800 | **/ | |
1801 | ||
1802 | static int __init ip6_tunnel_init(void) | |
1803 | { | |
1804 | int err; | |
1805 | ||
d5aa407f AD |
1806 | err = register_pernet_device(&ip6_tnl_net_ops); |
1807 | if (err < 0) | |
1808 | goto out_pernet; | |
1809 | ||
1810 | err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET); | |
1811 | if (err < 0) { | |
f3213831 | 1812 | pr_err("%s: can't register ip4ip6\n", __func__); |
d5aa407f | 1813 | goto out_ip4ip6; |
c4d3efaf YK |
1814 | } |
1815 | ||
d5aa407f AD |
1816 | err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6); |
1817 | if (err < 0) { | |
f3213831 | 1818 | pr_err("%s: can't register ip6ip6\n", __func__); |
d5aa407f | 1819 | goto out_ip6ip6; |
1da177e4 | 1820 | } |
c075b130 ND |
1821 | err = rtnl_link_register(&ip6_link_ops); |
1822 | if (err < 0) | |
1823 | goto rtnl_link_failed; | |
13eeb8e9 | 1824 | |
1da177e4 | 1825 | return 0; |
d5aa407f | 1826 | |
c075b130 ND |
1827 | rtnl_link_failed: |
1828 | xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6); | |
d5aa407f | 1829 | out_ip6ip6: |
c4d3efaf | 1830 | xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); |
d5aa407f AD |
1831 | out_ip4ip6: |
1832 | unregister_pernet_device(&ip6_tnl_net_ops); | |
1833 | out_pernet: | |
1da177e4 LT |
1834 | return err; |
1835 | } | |
1836 | ||
1837 | /** | |
1838 | * ip6_tunnel_cleanup - free resources and unregister protocol | |
1839 | **/ | |
1840 | ||
1841 | static void __exit ip6_tunnel_cleanup(void) | |
1842 | { | |
c075b130 | 1843 | rtnl_link_unregister(&ip6_link_ops); |
c4d3efaf | 1844 | if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) |
f3213831 | 1845 | pr_info("%s: can't deregister ip4ip6\n", __func__); |
c4d3efaf | 1846 | |
73d605d1 | 1847 | if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) |
f3213831 | 1848 | pr_info("%s: can't deregister ip6ip6\n", __func__); |
1da177e4 | 1849 | |
ac31cd3c | 1850 | unregister_pernet_device(&ip6_tnl_net_ops); |
1da177e4 LT |
1851 | } |
1852 | ||
1853 | module_init(ip6_tunnel_init); | |
1854 | module_exit(ip6_tunnel_cleanup); |