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