Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
c4d3efaf | 2 | * IPv6 tunneling device |
1da177e4 LT |
3 | * Linux INET6 implementation |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Ville Nuorvala <vnuorval@tcs.hut.fi> |
c4d3efaf | 7 | * Yasuyuki Kozakai <kozakai@linux-ipv6.org> |
1da177e4 | 8 | * |
1da177e4 | 9 | * Based on: |
c4d3efaf | 10 | * linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c |
1da177e4 LT |
11 | * |
12 | * RFC 2473 | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU General Public License | |
16 | * as published by the Free Software Foundation; either version | |
17 | * 2 of the License, or (at your option) any later version. | |
18 | * | |
19 | */ | |
20 | ||
f3213831 JP |
21 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
22 | ||
1da177e4 | 23 | #include <linux/module.h> |
4fc268d2 | 24 | #include <linux/capability.h> |
1da177e4 LT |
25 | #include <linux/errno.h> |
26 | #include <linux/types.h> | |
27 | #include <linux/sockios.h> | |
c4d3efaf | 28 | #include <linux/icmp.h> |
1da177e4 LT |
29 | #include <linux/if.h> |
30 | #include <linux/in.h> | |
31 | #include <linux/ip.h> | |
1da177e4 LT |
32 | #include <linux/net.h> |
33 | #include <linux/in6.h> | |
34 | #include <linux/netdevice.h> | |
35 | #include <linux/if_arp.h> | |
36 | #include <linux/icmpv6.h> | |
37 | #include <linux/init.h> | |
38 | #include <linux/route.h> | |
39 | #include <linux/rtnetlink.h> | |
40 | #include <linux/netfilter_ipv6.h> | |
5a0e3ad6 | 41 | #include <linux/slab.h> |
ddbe5032 | 42 | #include <linux/hash.h> |
e837735e | 43 | #include <linux/etherdevice.h> |
1da177e4 LT |
44 | |
45 | #include <asm/uaccess.h> | |
60063497 | 46 | #include <linux/atomic.h> |
1da177e4 | 47 | |
c4d3efaf | 48 | #include <net/icmp.h> |
1da177e4 | 49 | #include <net/ip.h> |
c5441932 | 50 | #include <net/ip_tunnels.h> |
1da177e4 | 51 | #include <net/ipv6.h> |
1da177e4 LT |
52 | #include <net/ip6_route.h> |
53 | #include <net/addrconf.h> | |
54 | #include <net/ip6_tunnel.h> | |
55 | #include <net/xfrm.h> | |
56 | #include <net/dsfield.h> | |
57 | #include <net/inet_ecn.h> | |
13eeb8e9 PE |
58 | #include <net/net_namespace.h> |
59 | #include <net/netns/generic.h> | |
1da177e4 LT |
60 | |
61 | MODULE_AUTHOR("Ville Nuorvala"); | |
c4d3efaf | 62 | MODULE_DESCRIPTION("IPv6 tunneling device"); |
1da177e4 | 63 | MODULE_LICENSE("GPL"); |
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 | ||
c4d3efaf | 72 | #define IPV6_TCLASS_SHIFT 20 |
1da177e4 | 73 | |
ddbe5032 ED |
74 | #define HASH_SIZE_SHIFT 5 |
75 | #define HASH_SIZE (1 << HASH_SIZE_SHIFT) | |
1da177e4 | 76 | |
f4e0b4c5 ND |
77 | static bool log_ecn_error = true; |
78 | module_param(log_ecn_error, bool, 0644); | |
79 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); | |
80 | ||
ddbe5032 ED |
81 | static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2) |
82 | { | |
83 | u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2); | |
84 | ||
85 | return hash_32(hash, HASH_SIZE_SHIFT); | |
86 | } | |
1da177e4 | 87 | |
8560f226 | 88 | static int ip6_tnl_dev_init(struct net_device *dev); |
3144581c | 89 | static void ip6_tnl_dev_setup(struct net_device *dev); |
c075b130 | 90 | static struct rtnl_link_ops ip6_link_ops __read_mostly; |
1da177e4 | 91 | |
f99189b1 | 92 | static int ip6_tnl_net_id __read_mostly; |
13eeb8e9 | 93 | struct ip6_tnl_net { |
15820e12 PE |
94 | /* the IPv6 tunnel fallback device */ |
95 | struct net_device *fb_tnl_dev; | |
3e6c9fb5 | 96 | /* lists for storing tunnels in use */ |
94767632 ED |
97 | struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE]; |
98 | struct ip6_tnl __rcu *tnls_wc[1]; | |
99 | struct ip6_tnl __rcu **tnls[2]; | |
13eeb8e9 PE |
100 | }; |
101 | ||
8560f226 ED |
102 | static struct net_device_stats *ip6_get_stats(struct net_device *dev) |
103 | { | |
8f84985f | 104 | struct pcpu_sw_netstats sum = { 0 }; |
8560f226 ED |
105 | int i; |
106 | ||
107 | for_each_possible_cpu(i) { | |
8f84985f LR |
108 | const struct pcpu_sw_netstats *tstats = |
109 | per_cpu_ptr(dev->tstats, i); | |
8560f226 ED |
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) { |
8f84985f | 787 | struct pcpu_sw_netstats *tstats; |
8560f226 | 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 | } | |
b0e380b1 | 804 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 805 | skb_reset_network_header(skb); |
8359925b | 806 | skb->protocol = htons(protocol); |
1da177e4 | 807 | memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); |
8359925b | 808 | |
ea23192e | 809 | __skb_tunnel_rx(skb, t->dev, t->net); |
f4e0b4c5 ND |
810 | |
811 | err = dscp_ecn_decapsulate(t, ipv6h, skb); | |
812 | if (unlikely(err)) { | |
813 | if (log_ecn_error) | |
814 | net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n", | |
815 | &ipv6h->saddr, | |
816 | ipv6_get_dsfield(ipv6h)); | |
817 | if (err > 1) { | |
818 | ++t->dev->stats.rx_frame_errors; | |
819 | ++t->dev->stats.rx_errors; | |
820 | rcu_read_unlock(); | |
821 | goto discard; | |
822 | } | |
823 | } | |
824 | ||
8560f226 ED |
825 | tstats = this_cpu_ptr(t->dev->tstats); |
826 | tstats->rx_packets++; | |
827 | tstats->rx_bytes += skb->len; | |
828 | ||
caf586e5 | 829 | netif_rx(skb); |
8990f468 | 830 | |
2922bc8a | 831 | rcu_read_unlock(); |
1da177e4 LT |
832 | return 0; |
833 | } | |
2922bc8a | 834 | rcu_read_unlock(); |
1da177e4 | 835 | return 1; |
50fba2aa HX |
836 | |
837 | discard: | |
838 | kfree_skb(skb); | |
839 | return 0; | |
1da177e4 LT |
840 | } |
841 | ||
c4d3efaf YK |
842 | static int ip4ip6_rcv(struct sk_buff *skb) |
843 | { | |
502b0935 YK |
844 | return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP, |
845 | ip4ip6_dscp_ecn_decapsulate); | |
c4d3efaf YK |
846 | } |
847 | ||
8359925b YK |
848 | static int ip6ip6_rcv(struct sk_buff *skb) |
849 | { | |
502b0935 YK |
850 | return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6, |
851 | ip6ip6_dscp_ecn_decapsulate); | |
8359925b YK |
852 | } |
853 | ||
6fb32dde VN |
854 | struct ipv6_tel_txoption { |
855 | struct ipv6_txoptions ops; | |
856 | __u8 dst_opt[8]; | |
857 | }; | |
1da177e4 | 858 | |
6fb32dde VN |
859 | static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) |
860 | { | |
861 | memset(opt, 0, sizeof(struct ipv6_tel_txoption)); | |
1da177e4 | 862 | |
6fb32dde VN |
863 | opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; |
864 | opt->dst_opt[3] = 1; | |
865 | opt->dst_opt[4] = encap_limit; | |
866 | opt->dst_opt[5] = IPV6_TLV_PADN; | |
867 | opt->dst_opt[6] = 1; | |
1da177e4 | 868 | |
6fb32dde VN |
869 | opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; |
870 | opt->ops.opt_nflen = 8; | |
1da177e4 LT |
871 | } |
872 | ||
873 | /** | |
3144581c | 874 | * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own |
1da177e4 | 875 | * @t: the outgoing tunnel device |
1ab1457c | 876 | * @hdr: IPv6 header from the incoming packet |
1da177e4 LT |
877 | * |
878 | * Description: | |
1ab1457c | 879 | * Avoid trivial tunneling loop by checking that tunnel exit-point |
1da177e4 LT |
880 | * doesn't match source of incoming packet. |
881 | * | |
1ab1457c | 882 | * Return: |
1da177e4 LT |
883 | * 1 if conflict, |
884 | * 0 else | |
885 | **/ | |
886 | ||
92113bfd | 887 | static inline bool |
b71d1d42 | 888 | ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) |
1da177e4 LT |
889 | { |
890 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
891 | } | |
892 | ||
c12b395a | 893 | int ip6_tnl_xmit_ctl(struct ip6_tnl *t) |
09c6bbf0 | 894 | { |
c12b395a | 895 | struct __ip6_tnl_parm *p = &t->parms; |
09c6bbf0 | 896 | int ret = 0; |
0bd87628 | 897 | struct net *net = t->net; |
09c6bbf0 | 898 | |
1ab1457c | 899 | if (p->flags & IP6_TNL_F_CAP_XMIT) { |
09c6bbf0 VN |
900 | struct net_device *ldev = NULL; |
901 | ||
f1a28eab | 902 | rcu_read_lock(); |
09c6bbf0 | 903 | if (p->link) |
f1a28eab | 904 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 905 | |
2f7f54b7 | 906 | if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0))) |
f3213831 JP |
907 | pr_warn("%s xmit: Local address not yet configured!\n", |
908 | p->name); | |
09c6bbf0 | 909 | else if (!ipv6_addr_is_multicast(&p->raddr) && |
2f7f54b7 | 910 | unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0))) |
f3213831 JP |
911 | pr_warn("%s xmit: Routing loop! Remote address found on this node!\n", |
912 | p->name); | |
09c6bbf0 VN |
913 | else |
914 | ret = 1; | |
f1a28eab | 915 | rcu_read_unlock(); |
09c6bbf0 VN |
916 | } |
917 | return ret; | |
918 | } | |
c12b395a | 919 | EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl); |
920 | ||
1da177e4 | 921 | /** |
61ec2aec | 922 | * ip6_tnl_xmit2 - encapsulate packet and send |
1da177e4 | 923 | * @skb: the outgoing socket buffer |
1ab1457c | 924 | * @dev: the outgoing tunnel device |
61ec2aec YK |
925 | * @dsfield: dscp code for outer header |
926 | * @fl: flow of tunneled packet | |
927 | * @encap_limit: encapsulation limit | |
928 | * @pmtu: Path MTU is stored if packet is too big | |
1da177e4 LT |
929 | * |
930 | * Description: | |
931 | * Build new header and do some sanity checks on the packet before sending | |
932 | * it. | |
933 | * | |
1ab1457c | 934 | * Return: |
c4d3efaf | 935 | * 0 on success |
61ec2aec YK |
936 | * -1 fail |
937 | * %-EMSGSIZE message too big. return mtu in this case. | |
1da177e4 LT |
938 | **/ |
939 | ||
61ec2aec YK |
940 | static int ip6_tnl_xmit2(struct sk_buff *skb, |
941 | struct net_device *dev, | |
942 | __u8 dsfield, | |
4c9483b2 | 943 | struct flowi6 *fl6, |
61ec2aec YK |
944 | int encap_limit, |
945 | __u32 *pmtu) | |
1da177e4 | 946 | { |
2941a486 | 947 | struct ip6_tnl *t = netdev_priv(dev); |
0bd87628 | 948 | struct net *net = t->net; |
3dca02af | 949 | struct net_device_stats *stats = &t->dev->stats; |
0660e03f | 950 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
6fb32dde | 951 | struct ipv6_tel_txoption opt; |
d24f22f3 | 952 | struct dst_entry *dst = NULL, *ndst = NULL; |
1da177e4 LT |
953 | struct net_device *tdev; |
954 | int mtu; | |
c2636b4d | 955 | unsigned int max_headroom = sizeof(struct ipv6hdr); |
1da177e4 | 956 | u8 proto; |
61ec2aec | 957 | int err = -1; |
1da177e4 | 958 | |
d24f22f3 ED |
959 | if (!fl6->flowi6_mark) |
960 | dst = ip6_tnl_dst_check(t); | |
89b02126 ED |
961 | if (!dst) { |
962 | ndst = ip6_route_output(net, NULL, fl6); | |
1da177e4 | 963 | |
89b02126 | 964 | if (ndst->error) |
a57ebc90 | 965 | goto tx_err_link_failure; |
89b02126 ED |
966 | ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0); |
967 | if (IS_ERR(ndst)) { | |
968 | err = PTR_ERR(ndst); | |
969 | ndst = NULL; | |
452edd59 DM |
970 | goto tx_err_link_failure; |
971 | } | |
89b02126 | 972 | dst = ndst; |
a57ebc90 | 973 | } |
1da177e4 LT |
974 | |
975 | tdev = dst->dev; | |
976 | ||
977 | if (tdev == dev) { | |
978 | stats->collisions++; | |
e87cc472 JP |
979 | net_warn_ratelimited("%s: Local routing loop detected!\n", |
980 | t->parms.name); | |
1da177e4 LT |
981 | goto tx_err_dst_release; |
982 | } | |
983 | mtu = dst_mtu(dst) - sizeof (*ipv6h); | |
6fb32dde | 984 | if (encap_limit >= 0) { |
1da177e4 LT |
985 | max_headroom += 8; |
986 | mtu -= 8; | |
987 | } | |
988 | if (mtu < IPV6_MIN_MTU) | |
989 | mtu = IPV6_MIN_MTU; | |
adf30907 | 990 | if (skb_dst(skb)) |
6700c270 | 991 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); |
1da177e4 | 992 | if (skb->len > mtu) { |
61ec2aec YK |
993 | *pmtu = mtu; |
994 | err = -EMSGSIZE; | |
1da177e4 LT |
995 | goto tx_err_dst_release; |
996 | } | |
997 | ||
963a88b3 | 998 | skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev))); |
0bd87628 | 999 | |
1da177e4 LT |
1000 | /* |
1001 | * Okay, now see if we can stuff it in the buffer as-is. | |
1002 | */ | |
1003 | max_headroom += LL_RESERVED_SPACE(tdev); | |
1ab1457c | 1004 | |
cfbba49d PM |
1005 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
1006 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 | 1007 | struct sk_buff *new_skb; |
1ab1457c | 1008 | |
1da177e4 LT |
1009 | if (!(new_skb = skb_realloc_headroom(skb, max_headroom))) |
1010 | goto tx_err_dst_release; | |
1011 | ||
1012 | if (skb->sk) | |
1013 | skb_set_owner_w(new_skb, skb->sk); | |
9ff26449 | 1014 | consume_skb(skb); |
1da177e4 LT |
1015 | skb = new_skb; |
1016 | } | |
d24f22f3 ED |
1017 | if (fl6->flowi6_mark) { |
1018 | skb_dst_set(skb, dst); | |
1019 | ndst = NULL; | |
1020 | } else { | |
1021 | skb_dst_set_noref(skb, dst); | |
1022 | } | |
b0e380b1 | 1023 | skb->transport_header = skb->network_header; |
1da177e4 | 1024 | |
4c9483b2 | 1025 | proto = fl6->flowi6_proto; |
6fb32dde VN |
1026 | if (encap_limit >= 0) { |
1027 | init_tel_txopt(&opt, encap_limit); | |
1028 | ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); | |
1029 | } | |
3d483058 HFS |
1030 | |
1031 | if (likely(!skb->encapsulation)) { | |
1032 | skb_reset_inner_headers(skb); | |
1033 | skb->encapsulation = 1; | |
1034 | } | |
1035 | ||
e2d1bca7 ACM |
1036 | skb_push(skb, sizeof(struct ipv6hdr)); |
1037 | skb_reset_network_header(skb); | |
0660e03f | 1038 | ipv6h = ipv6_hdr(skb); |
3e4e4c1f | 1039 | ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), fl6->flowlabel); |
1da177e4 LT |
1040 | ipv6h->hop_limit = t->parms.hop_limit; |
1041 | ipv6h->nexthdr = proto; | |
4e3fd7a0 AD |
1042 | ipv6h->saddr = fl6->saddr; |
1043 | ipv6h->daddr = fl6->daddr; | |
e8f72ea4 | 1044 | ip6tunnel_xmit(skb, dev); |
89b02126 ED |
1045 | if (ndst) |
1046 | ip6_tnl_dst_store(t, ndst); | |
1da177e4 LT |
1047 | return 0; |
1048 | tx_err_link_failure: | |
1049 | stats->tx_carrier_errors++; | |
1050 | dst_link_failure(skb); | |
1051 | tx_err_dst_release: | |
89b02126 | 1052 | dst_release(ndst); |
61ec2aec YK |
1053 | return err; |
1054 | } | |
1055 | ||
c4d3efaf YK |
1056 | static inline int |
1057 | ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1058 | { | |
1059 | struct ip6_tnl *t = netdev_priv(dev); | |
b71d1d42 | 1060 | const struct iphdr *iph = ip_hdr(skb); |
c4d3efaf | 1061 | int encap_limit = -1; |
4c9483b2 | 1062 | struct flowi6 fl6; |
c4d3efaf YK |
1063 | __u8 dsfield; |
1064 | __u32 mtu; | |
1065 | int err; | |
1066 | ||
502b0935 YK |
1067 | if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) || |
1068 | !ip6_tnl_xmit_ctl(t)) | |
c4d3efaf YK |
1069 | return -1; |
1070 | ||
1071 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1072 | encap_limit = t->parms.encap_limit; | |
1073 | ||
4c9483b2 DM |
1074 | memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6)); |
1075 | fl6.flowi6_proto = IPPROTO_IPIP; | |
c4d3efaf YK |
1076 | |
1077 | dsfield = ipv4_get_dsfield(iph); | |
1078 | ||
d24f22f3 | 1079 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
4c9483b2 | 1080 | fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) |
b77f2fa6 | 1081 | & IPV6_TCLASS_MASK; |
d24f22f3 ED |
1082 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
1083 | fl6.flowi6_mark = skb->mark; | |
c4d3efaf | 1084 | |
4c9483b2 | 1085 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); |
c4d3efaf YK |
1086 | if (err != 0) { |
1087 | /* XXX: send ICMP error even if DF is not set. */ | |
1088 | if (err == -EMSGSIZE) | |
1089 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
1090 | htonl(mtu)); | |
1091 | return -1; | |
1092 | } | |
1093 | ||
1094 | return 0; | |
1095 | } | |
1096 | ||
61ec2aec YK |
1097 | static inline int |
1098 | ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1099 | { | |
1100 | struct ip6_tnl *t = netdev_priv(dev); | |
0660e03f | 1101 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
61ec2aec YK |
1102 | int encap_limit = -1; |
1103 | __u16 offset; | |
4c9483b2 | 1104 | struct flowi6 fl6; |
61ec2aec YK |
1105 | __u8 dsfield; |
1106 | __u32 mtu; | |
1107 | int err; | |
1108 | ||
502b0935 YK |
1109 | if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) || |
1110 | !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h)) | |
61ec2aec YK |
1111 | return -1; |
1112 | ||
c12b395a | 1113 | offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); |
d56f90a7 | 1114 | if (offset > 0) { |
61ec2aec | 1115 | struct ipv6_tlv_tnl_enc_lim *tel; |
d56f90a7 | 1116 | tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; |
61ec2aec YK |
1117 | if (tel->encap_limit == 0) { |
1118 | icmpv6_send(skb, ICMPV6_PARAMPROB, | |
3ffe533c | 1119 | ICMPV6_HDR_FIELD, offset + 2); |
61ec2aec YK |
1120 | return -1; |
1121 | } | |
1122 | encap_limit = tel->encap_limit - 1; | |
1123 | } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1124 | encap_limit = t->parms.encap_limit; | |
1125 | ||
4c9483b2 DM |
1126 | memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6)); |
1127 | fl6.flowi6_proto = IPPROTO_IPV6; | |
61ec2aec YK |
1128 | |
1129 | dsfield = ipv6_get_dsfield(ipv6h); | |
d24f22f3 | 1130 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
4c9483b2 | 1131 | fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); |
d24f22f3 | 1132 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) |
3308de2b | 1133 | fl6.flowlabel |= ip6_flowlabel(ipv6h); |
d24f22f3 ED |
1134 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
1135 | fl6.flowi6_mark = skb->mark; | |
61ec2aec | 1136 | |
4c9483b2 | 1137 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); |
61ec2aec YK |
1138 | if (err != 0) { |
1139 | if (err == -EMSGSIZE) | |
3ffe533c | 1140 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
61ec2aec YK |
1141 | return -1; |
1142 | } | |
1143 | ||
1144 | return 0; | |
1145 | } | |
1146 | ||
6fef4c0c | 1147 | static netdev_tx_t |
61ec2aec YK |
1148 | ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) |
1149 | { | |
1150 | struct ip6_tnl *t = netdev_priv(dev); | |
3dca02af | 1151 | struct net_device_stats *stats = &t->dev->stats; |
61ec2aec YK |
1152 | int ret; |
1153 | ||
61ec2aec | 1154 | switch (skb->protocol) { |
60678040 | 1155 | case htons(ETH_P_IP): |
c4d3efaf YK |
1156 | ret = ip4ip6_tnl_xmit(skb, dev); |
1157 | break; | |
60678040 | 1158 | case htons(ETH_P_IPV6): |
61ec2aec YK |
1159 | ret = ip6ip6_tnl_xmit(skb, dev); |
1160 | break; | |
1161 | default: | |
1162 | goto tx_err; | |
1163 | } | |
1164 | ||
1165 | if (ret < 0) | |
1166 | goto tx_err; | |
1167 | ||
6ed10654 | 1168 | return NETDEV_TX_OK; |
61ec2aec | 1169 | |
1da177e4 LT |
1170 | tx_err: |
1171 | stats->tx_errors++; | |
1172 | stats->tx_dropped++; | |
1173 | kfree_skb(skb); | |
6ed10654 | 1174 | return NETDEV_TX_OK; |
1da177e4 LT |
1175 | } |
1176 | ||
3144581c | 1177 | static void ip6_tnl_link_config(struct ip6_tnl *t) |
1da177e4 LT |
1178 | { |
1179 | struct net_device *dev = t->dev; | |
c12b395a | 1180 | struct __ip6_tnl_parm *p = &t->parms; |
4c9483b2 | 1181 | struct flowi6 *fl6 = &t->fl.u.ip6; |
1da177e4 | 1182 | |
3a6d54c5 JP |
1183 | memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); |
1184 | memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
1da177e4 LT |
1185 | |
1186 | /* Set up flowi template */ | |
4e3fd7a0 AD |
1187 | fl6->saddr = p->laddr; |
1188 | fl6->daddr = p->raddr; | |
4c9483b2 DM |
1189 | fl6->flowi6_oif = p->link; |
1190 | fl6->flowlabel = 0; | |
1da177e4 LT |
1191 | |
1192 | if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) | |
4c9483b2 | 1193 | fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; |
1da177e4 | 1194 | if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) |
4c9483b2 | 1195 | fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; |
1da177e4 | 1196 | |
d0087b29 VN |
1197 | p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); |
1198 | p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); | |
1da177e4 LT |
1199 | |
1200 | if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) | |
1201 | dev->flags |= IFF_POINTOPOINT; | |
1202 | else | |
1203 | dev->flags &= ~IFF_POINTOPOINT; | |
1204 | ||
1205 | dev->iflink = p->link; | |
1206 | ||
1207 | if (p->flags & IP6_TNL_F_CAP_XMIT) { | |
305d4b3c VN |
1208 | int strict = (ipv6_addr_type(&p->raddr) & |
1209 | (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); | |
1210 | ||
0bd87628 | 1211 | struct rt6_info *rt = rt6_lookup(t->net, |
2f7f54b7 | 1212 | &p->raddr, &p->laddr, |
305d4b3c | 1213 | p->link, strict); |
1da177e4 LT |
1214 | |
1215 | if (rt == NULL) | |
1216 | return; | |
1217 | ||
d1918542 DM |
1218 | if (rt->dst.dev) { |
1219 | dev->hard_header_len = rt->dst.dev->hard_header_len + | |
1da177e4 LT |
1220 | sizeof (struct ipv6hdr); |
1221 | ||
d1918542 | 1222 | dev->mtu = rt->dst.dev->mtu - sizeof (struct ipv6hdr); |
381601e5 AF |
1223 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
1224 | dev->mtu-=8; | |
1da177e4 LT |
1225 | |
1226 | if (dev->mtu < IPV6_MIN_MTU) | |
1227 | dev->mtu = IPV6_MIN_MTU; | |
1228 | } | |
94e187c0 | 1229 | ip6_rt_put(rt); |
1da177e4 LT |
1230 | } |
1231 | } | |
1232 | ||
1233 | /** | |
3144581c | 1234 | * ip6_tnl_change - update the tunnel parameters |
1da177e4 LT |
1235 | * @t: tunnel to be changed |
1236 | * @p: tunnel configuration parameters | |
1da177e4 LT |
1237 | * |
1238 | * Description: | |
3144581c | 1239 | * ip6_tnl_change() updates the tunnel parameters |
1da177e4 LT |
1240 | **/ |
1241 | ||
1242 | static int | |
c12b395a | 1243 | ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) |
1da177e4 | 1244 | { |
4e3fd7a0 AD |
1245 | t->parms.laddr = p->laddr; |
1246 | t->parms.raddr = p->raddr; | |
1da177e4 LT |
1247 | t->parms.flags = p->flags; |
1248 | t->parms.hop_limit = p->hop_limit; | |
1249 | t->parms.encap_limit = p->encap_limit; | |
1250 | t->parms.flowinfo = p->flowinfo; | |
8181b8c1 | 1251 | t->parms.link = p->link; |
502b0935 | 1252 | t->parms.proto = p->proto; |
0c088890 | 1253 | ip6_tnl_dst_reset(t); |
3144581c | 1254 | ip6_tnl_link_config(t); |
1da177e4 LT |
1255 | return 0; |
1256 | } | |
1257 | ||
0b112457 ND |
1258 | static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) |
1259 | { | |
0bd87628 | 1260 | struct net *net = t->net; |
0b112457 ND |
1261 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1262 | int err; | |
1263 | ||
1264 | ip6_tnl_unlink(ip6n, t); | |
1265 | synchronize_net(); | |
1266 | err = ip6_tnl_change(t, p); | |
1267 | ip6_tnl_link(ip6n, t); | |
1268 | netdev_state_change(t->dev); | |
1269 | return err; | |
1270 | } | |
1271 | ||
c12b395a | 1272 | static void |
1273 | ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u) | |
1274 | { | |
1275 | p->laddr = u->laddr; | |
1276 | p->raddr = u->raddr; | |
1277 | p->flags = u->flags; | |
1278 | p->hop_limit = u->hop_limit; | |
1279 | p->encap_limit = u->encap_limit; | |
1280 | p->flowinfo = u->flowinfo; | |
1281 | p->link = u->link; | |
1282 | p->proto = u->proto; | |
1283 | memcpy(p->name, u->name, sizeof(u->name)); | |
1284 | } | |
1285 | ||
1286 | static void | |
1287 | ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p) | |
1288 | { | |
1289 | u->laddr = p->laddr; | |
1290 | u->raddr = p->raddr; | |
1291 | u->flags = p->flags; | |
1292 | u->hop_limit = p->hop_limit; | |
1293 | u->encap_limit = p->encap_limit; | |
1294 | u->flowinfo = p->flowinfo; | |
1295 | u->link = p->link; | |
1296 | u->proto = p->proto; | |
1297 | memcpy(u->name, p->name, sizeof(u->name)); | |
1298 | } | |
1299 | ||
1da177e4 | 1300 | /** |
3144581c | 1301 | * ip6_tnl_ioctl - configure ipv6 tunnels from userspace |
1da177e4 LT |
1302 | * @dev: virtual device associated with tunnel |
1303 | * @ifr: parameters passed from userspace | |
1304 | * @cmd: command to be performed | |
1305 | * | |
1306 | * Description: | |
3144581c | 1307 | * ip6_tnl_ioctl() is used for managing IPv6 tunnels |
1ab1457c | 1308 | * from userspace. |
1da177e4 LT |
1309 | * |
1310 | * The possible commands are the following: | |
1311 | * %SIOCGETTUNNEL: get tunnel parameters for device | |
1312 | * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters | |
1313 | * %SIOCCHGTUNNEL: change tunnel parameters to those given | |
1314 | * %SIOCDELTUNNEL: delete tunnel | |
1315 | * | |
1ab1457c | 1316 | * The fallback device "ip6tnl0", created during module |
1da177e4 LT |
1317 | * initialization, can be used for creating other tunnel devices. |
1318 | * | |
1319 | * Return: | |
1320 | * 0 on success, | |
1321 | * %-EFAULT if unable to copy data to or from userspace, | |
1322 | * %-EPERM if current process hasn't %CAP_NET_ADMIN set | |
1323 | * %-EINVAL if passed tunnel parameters are invalid, | |
1324 | * %-EEXIST if changing a tunnel's parameters would cause a conflict | |
1325 | * %-ENODEV if attempting to change or delete a nonexisting device | |
1326 | **/ | |
1327 | ||
1328 | static int | |
3144581c | 1329 | ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
1da177e4 LT |
1330 | { |
1331 | int err = 0; | |
1da177e4 | 1332 | struct ip6_tnl_parm p; |
c12b395a | 1333 | struct __ip6_tnl_parm p1; |
1da177e4 | 1334 | struct ip6_tnl *t = NULL; |
2dd02c89 PE |
1335 | struct net *net = dev_net(dev); |
1336 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1da177e4 LT |
1337 | |
1338 | switch (cmd) { | |
1339 | case SIOCGETTUNNEL: | |
15820e12 | 1340 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 | 1341 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) { |
1da177e4 LT |
1342 | err = -EFAULT; |
1343 | break; | |
1344 | } | |
c12b395a | 1345 | ip6_tnl_parm_from_user(&p1, &p); |
1346 | t = ip6_tnl_locate(net, &p1, 0); | |
5ef5d6c5 DC |
1347 | } else { |
1348 | memset(&p, 0, sizeof(p)); | |
567131a7 VN |
1349 | } |
1350 | if (t == NULL) | |
2941a486 | 1351 | t = netdev_priv(dev); |
c12b395a | 1352 | ip6_tnl_parm_to_user(&p, &t->parms); |
1da177e4 LT |
1353 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) { |
1354 | err = -EFAULT; | |
1355 | } | |
1356 | break; | |
1357 | case SIOCADDTUNNEL: | |
1358 | case SIOCCHGTUNNEL: | |
1359 | err = -EPERM; | |
af31f412 | 1360 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 1361 | break; |
567131a7 VN |
1362 | err = -EFAULT; |
1363 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1364 | break; |
567131a7 | 1365 | err = -EINVAL; |
502b0935 YK |
1366 | if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && |
1367 | p.proto != 0) | |
1da177e4 | 1368 | break; |
c12b395a | 1369 | ip6_tnl_parm_from_user(&p1, &p); |
1370 | t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL); | |
15820e12 | 1371 | if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) { |
567131a7 VN |
1372 | if (t != NULL) { |
1373 | if (t->dev != dev) { | |
1374 | err = -EEXIST; | |
1375 | break; | |
1376 | } | |
1377 | } else | |
1378 | t = netdev_priv(dev); | |
1379 | ||
0b112457 | 1380 | err = ip6_tnl_update(t, &p1); |
1da177e4 | 1381 | } |
567131a7 | 1382 | if (t) { |
1da177e4 | 1383 | err = 0; |
c12b395a | 1384 | ip6_tnl_parm_to_user(&p, &t->parms); |
1385 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
567131a7 VN |
1386 | err = -EFAULT; |
1387 | ||
1388 | } else | |
1389 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1da177e4 LT |
1390 | break; |
1391 | case SIOCDELTUNNEL: | |
1392 | err = -EPERM; | |
af31f412 | 1393 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1394 | break; |
1395 | ||
15820e12 | 1396 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 VN |
1397 | err = -EFAULT; |
1398 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1399 | break; |
567131a7 | 1400 | err = -ENOENT; |
c12b395a | 1401 | ip6_tnl_parm_from_user(&p1, &p); |
1402 | t = ip6_tnl_locate(net, &p1, 0); | |
1403 | if (t == NULL) | |
1da177e4 | 1404 | break; |
567131a7 | 1405 | err = -EPERM; |
15820e12 | 1406 | if (t->dev == ip6n->fb_tnl_dev) |
1da177e4 | 1407 | break; |
567131a7 | 1408 | dev = t->dev; |
1da177e4 | 1409 | } |
22f8cde5 SH |
1410 | err = 0; |
1411 | unregister_netdevice(dev); | |
1da177e4 LT |
1412 | break; |
1413 | default: | |
1414 | err = -EINVAL; | |
1415 | } | |
1416 | return err; | |
1417 | } | |
1418 | ||
1da177e4 | 1419 | /** |
3144581c | 1420 | * ip6_tnl_change_mtu - change mtu manually for tunnel device |
1da177e4 LT |
1421 | * @dev: virtual device associated with tunnel |
1422 | * @new_mtu: the new mtu | |
1423 | * | |
1424 | * Return: | |
1425 | * 0 on success, | |
1426 | * %-EINVAL if mtu too small | |
1427 | **/ | |
1428 | ||
1429 | static int | |
3144581c | 1430 | ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) |
1da177e4 | 1431 | { |
582442d6 OG |
1432 | struct ip6_tnl *tnl = netdev_priv(dev); |
1433 | ||
1434 | if (tnl->parms.proto == IPPROTO_IPIP) { | |
1435 | if (new_mtu < 68) | |
1436 | return -EINVAL; | |
1437 | } else { | |
1438 | if (new_mtu < IPV6_MIN_MTU) | |
1439 | return -EINVAL; | |
1da177e4 | 1440 | } |
582442d6 OG |
1441 | if (new_mtu > 0xFFF8 - dev->hard_header_len) |
1442 | return -EINVAL; | |
1da177e4 LT |
1443 | dev->mtu = new_mtu; |
1444 | return 0; | |
1445 | } | |
1446 | ||
1326c3d5 SH |
1447 | |
1448 | static const struct net_device_ops ip6_tnl_netdev_ops = { | |
8560f226 | 1449 | .ndo_uninit = ip6_tnl_dev_uninit, |
1326c3d5 | 1450 | .ndo_start_xmit = ip6_tnl_xmit, |
8560f226 | 1451 | .ndo_do_ioctl = ip6_tnl_ioctl, |
1326c3d5 | 1452 | .ndo_change_mtu = ip6_tnl_change_mtu, |
8560f226 | 1453 | .ndo_get_stats = ip6_get_stats, |
1326c3d5 SH |
1454 | }; |
1455 | ||
8560f226 | 1456 | |
1da177e4 | 1457 | /** |
3144581c | 1458 | * ip6_tnl_dev_setup - setup virtual tunnel device |
1da177e4 LT |
1459 | * @dev: virtual device associated with tunnel |
1460 | * | |
1461 | * Description: | |
1462 | * Initialize function pointers and device parameters | |
1463 | **/ | |
1464 | ||
3144581c | 1465 | static void ip6_tnl_dev_setup(struct net_device *dev) |
1da177e4 | 1466 | { |
381601e5 AF |
1467 | struct ip6_tnl *t; |
1468 | ||
1326c3d5 | 1469 | dev->netdev_ops = &ip6_tnl_netdev_ops; |
8560f226 | 1470 | dev->destructor = ip6_dev_free; |
1da177e4 LT |
1471 | |
1472 | dev->type = ARPHRD_TUNNEL6; | |
1473 | dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr); | |
1474 | dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr); | |
381601e5 AF |
1475 | t = netdev_priv(dev); |
1476 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1477 | dev->mtu-=8; | |
1da177e4 LT |
1478 | dev->flags |= IFF_NOARP; |
1479 | dev->addr_len = sizeof(struct in6_addr); | |
7e223de8 | 1480 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
e837735e ND |
1481 | /* This perm addr will be used as interface identifier by IPv6 */ |
1482 | dev->addr_assign_type = NET_ADDR_RANDOM; | |
1483 | eth_random_addr(dev->perm_addr); | |
1da177e4 LT |
1484 | } |
1485 | ||
1486 | ||
1487 | /** | |
3144581c | 1488 | * ip6_tnl_dev_init_gen - general initializer for all tunnel devices |
1da177e4 LT |
1489 | * @dev: virtual device associated with tunnel |
1490 | **/ | |
1491 | ||
8560f226 | 1492 | static inline int |
3144581c | 1493 | ip6_tnl_dev_init_gen(struct net_device *dev) |
1da177e4 | 1494 | { |
2941a486 | 1495 | struct ip6_tnl *t = netdev_priv(dev); |
827da44c | 1496 | int i; |
8560f226 | 1497 | |
1da177e4 | 1498 | t->dev = dev; |
0bd87628 | 1499 | t->net = dev_net(dev); |
8f84985f | 1500 | dev->tstats = alloc_percpu(struct pcpu_sw_netstats); |
8560f226 ED |
1501 | if (!dev->tstats) |
1502 | return -ENOMEM; | |
827da44c JS |
1503 | |
1504 | for_each_possible_cpu(i) { | |
8f84985f | 1505 | struct pcpu_sw_netstats *ip6_tnl_stats; |
827da44c JS |
1506 | ip6_tnl_stats = per_cpu_ptr(dev->tstats, i); |
1507 | u64_stats_init(&ip6_tnl_stats->syncp); | |
1508 | } | |
8560f226 | 1509 | return 0; |
1da177e4 LT |
1510 | } |
1511 | ||
1512 | /** | |
3144581c | 1513 | * ip6_tnl_dev_init - initializer for all non fallback tunnel devices |
1da177e4 LT |
1514 | * @dev: virtual device associated with tunnel |
1515 | **/ | |
1516 | ||
8560f226 | 1517 | static int ip6_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1518 | { |
2941a486 | 1519 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 ED |
1520 | int err = ip6_tnl_dev_init_gen(dev); |
1521 | ||
1522 | if (err) | |
1523 | return err; | |
3144581c | 1524 | ip6_tnl_link_config(t); |
8560f226 | 1525 | return 0; |
1da177e4 LT |
1526 | } |
1527 | ||
1528 | /** | |
3144581c | 1529 | * ip6_fb_tnl_dev_init - initializer for fallback tunnel device |
1da177e4 LT |
1530 | * @dev: fallback device |
1531 | * | |
1532 | * Return: 0 | |
1533 | **/ | |
1534 | ||
8560f226 | 1535 | static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1536 | { |
2941a486 | 1537 | struct ip6_tnl *t = netdev_priv(dev); |
3e6c9fb5 PE |
1538 | struct net *net = dev_net(dev); |
1539 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
8560f226 ED |
1540 | int err = ip6_tnl_dev_init_gen(dev); |
1541 | ||
1542 | if (err) | |
1543 | return err; | |
3e6c9fb5 | 1544 | |
502b0935 | 1545 | t->parms.proto = IPPROTO_IPV6; |
1da177e4 | 1546 | dev_hold(dev); |
d0087b29 VN |
1547 | |
1548 | ip6_tnl_link_config(t); | |
1549 | ||
cf778b00 | 1550 | rcu_assign_pointer(ip6n->tnls_wc[0], t); |
8560f226 | 1551 | return 0; |
1da177e4 LT |
1552 | } |
1553 | ||
0b112457 ND |
1554 | static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[]) |
1555 | { | |
1556 | u8 proto; | |
1557 | ||
1558 | if (!data) | |
1559 | return 0; | |
1560 | ||
1561 | proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1562 | if (proto != IPPROTO_IPV6 && | |
1563 | proto != IPPROTO_IPIP && | |
1564 | proto != 0) | |
1565 | return -EINVAL; | |
1566 | ||
1567 | return 0; | |
1568 | } | |
1569 | ||
1570 | static void ip6_tnl_netlink_parms(struct nlattr *data[], | |
1571 | struct __ip6_tnl_parm *parms) | |
1572 | { | |
1573 | memset(parms, 0, sizeof(*parms)); | |
1574 | ||
1575 | if (!data) | |
1576 | return; | |
1577 | ||
1578 | if (data[IFLA_IPTUN_LINK]) | |
1579 | parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); | |
1580 | ||
1581 | if (data[IFLA_IPTUN_LOCAL]) | |
1582 | nla_memcpy(&parms->laddr, data[IFLA_IPTUN_LOCAL], | |
1583 | sizeof(struct in6_addr)); | |
1584 | ||
1585 | if (data[IFLA_IPTUN_REMOTE]) | |
1586 | nla_memcpy(&parms->raddr, data[IFLA_IPTUN_REMOTE], | |
1587 | sizeof(struct in6_addr)); | |
1588 | ||
1589 | if (data[IFLA_IPTUN_TTL]) | |
1590 | parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]); | |
1591 | ||
1592 | if (data[IFLA_IPTUN_ENCAP_LIMIT]) | |
1593 | parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]); | |
1594 | ||
1595 | if (data[IFLA_IPTUN_FLOWINFO]) | |
1ff05fb7 | 1596 | parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]); |
0b112457 ND |
1597 | |
1598 | if (data[IFLA_IPTUN_FLAGS]) | |
1599 | parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]); | |
1600 | ||
1601 | if (data[IFLA_IPTUN_PROTO]) | |
1602 | parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1603 | } | |
1604 | ||
1605 | static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev, | |
1606 | struct nlattr *tb[], struct nlattr *data[]) | |
1607 | { | |
1608 | struct net *net = dev_net(dev); | |
1609 | struct ip6_tnl *nt; | |
1610 | ||
1611 | nt = netdev_priv(dev); | |
1612 | ip6_tnl_netlink_parms(data, &nt->parms); | |
1613 | ||
1614 | if (ip6_tnl_locate(net, &nt->parms, 0)) | |
1615 | return -EEXIST; | |
1616 | ||
1617 | return ip6_tnl_create2(dev); | |
1618 | } | |
1619 | ||
1620 | static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[], | |
1621 | struct nlattr *data[]) | |
1622 | { | |
0bd87628 | 1623 | struct ip6_tnl *t = netdev_priv(dev); |
0b112457 | 1624 | struct __ip6_tnl_parm p; |
0bd87628 | 1625 | struct net *net = t->net; |
0b112457 ND |
1626 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1627 | ||
1628 | if (dev == ip6n->fb_tnl_dev) | |
1629 | return -EINVAL; | |
1630 | ||
1631 | ip6_tnl_netlink_parms(data, &p); | |
1632 | ||
1633 | t = ip6_tnl_locate(net, &p, 0); | |
1634 | ||
1635 | if (t) { | |
1636 | if (t->dev != dev) | |
1637 | return -EEXIST; | |
1638 | } else | |
1639 | t = netdev_priv(dev); | |
1640 | ||
1641 | return ip6_tnl_update(t, &p); | |
1642 | } | |
1643 | ||
1e9f3d6f ND |
1644 | static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head) |
1645 | { | |
1646 | struct net *net = dev_net(dev); | |
1647 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1648 | ||
1649 | if (dev != ip6n->fb_tnl_dev) | |
1650 | unregister_netdevice_queue(dev, head); | |
1651 | } | |
1652 | ||
b58d731a | 1653 | static size_t ip6_tnl_get_size(const struct net_device *dev) |
c075b130 ND |
1654 | { |
1655 | return | |
1656 | /* IFLA_IPTUN_LINK */ | |
1657 | nla_total_size(4) + | |
1658 | /* IFLA_IPTUN_LOCAL */ | |
1659 | nla_total_size(sizeof(struct in6_addr)) + | |
1660 | /* IFLA_IPTUN_REMOTE */ | |
1661 | nla_total_size(sizeof(struct in6_addr)) + | |
1662 | /* IFLA_IPTUN_TTL */ | |
1663 | nla_total_size(1) + | |
1664 | /* IFLA_IPTUN_ENCAP_LIMIT */ | |
1665 | nla_total_size(1) + | |
1666 | /* IFLA_IPTUN_FLOWINFO */ | |
1667 | nla_total_size(4) + | |
1668 | /* IFLA_IPTUN_FLAGS */ | |
1669 | nla_total_size(4) + | |
cfa323b6 ND |
1670 | /* IFLA_IPTUN_PROTO */ |
1671 | nla_total_size(1) + | |
c075b130 ND |
1672 | 0; |
1673 | } | |
1674 | ||
b58d731a | 1675 | static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev) |
c075b130 ND |
1676 | { |
1677 | struct ip6_tnl *tunnel = netdev_priv(dev); | |
1678 | struct __ip6_tnl_parm *parm = &tunnel->parms; | |
1679 | ||
1680 | if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || | |
1681 | nla_put(skb, IFLA_IPTUN_LOCAL, sizeof(struct in6_addr), | |
c075b130 | 1682 | &parm->laddr) || |
0d2ede92 DZ |
1683 | nla_put(skb, IFLA_IPTUN_REMOTE, sizeof(struct in6_addr), |
1684 | &parm->raddr) || | |
c075b130 ND |
1685 | nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) || |
1686 | nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) || | |
1687 | nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) || | |
cfa323b6 ND |
1688 | nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) || |
1689 | nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto)) | |
c075b130 ND |
1690 | goto nla_put_failure; |
1691 | return 0; | |
1692 | ||
1693 | nla_put_failure: | |
1694 | return -EMSGSIZE; | |
1695 | } | |
1696 | ||
0b112457 ND |
1697 | static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = { |
1698 | [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, | |
1699 | [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) }, | |
1700 | [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) }, | |
1701 | [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, | |
1702 | [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 }, | |
1703 | [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 }, | |
1704 | [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 }, | |
1705 | [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, | |
1706 | }; | |
1707 | ||
c075b130 ND |
1708 | static struct rtnl_link_ops ip6_link_ops __read_mostly = { |
1709 | .kind = "ip6tnl", | |
1710 | .maxtype = IFLA_IPTUN_MAX, | |
0b112457 | 1711 | .policy = ip6_tnl_policy, |
c075b130 | 1712 | .priv_size = sizeof(struct ip6_tnl), |
0b112457 ND |
1713 | .setup = ip6_tnl_dev_setup, |
1714 | .validate = ip6_tnl_validate, | |
1715 | .newlink = ip6_tnl_newlink, | |
1716 | .changelink = ip6_tnl_changelink, | |
1e9f3d6f | 1717 | .dellink = ip6_tnl_dellink, |
b58d731a ND |
1718 | .get_size = ip6_tnl_get_size, |
1719 | .fill_info = ip6_tnl_fill_info, | |
c075b130 ND |
1720 | }; |
1721 | ||
3ff2cfa5 | 1722 | static struct xfrm6_tunnel ip4ip6_handler __read_mostly = { |
c4d3efaf YK |
1723 | .handler = ip4ip6_rcv, |
1724 | .err_handler = ip4ip6_err, | |
1725 | .priority = 1, | |
1726 | }; | |
1727 | ||
3ff2cfa5 | 1728 | static struct xfrm6_tunnel ip6ip6_handler __read_mostly = { |
0303770d PM |
1729 | .handler = ip6ip6_rcv, |
1730 | .err_handler = ip6ip6_err, | |
d2acc347 | 1731 | .priority = 1, |
1da177e4 LT |
1732 | }; |
1733 | ||
1e9f3d6f | 1734 | static void __net_exit ip6_tnl_destroy_tunnels(struct net *net) |
3e6c9fb5 | 1735 | { |
1e9f3d6f | 1736 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
0bd87628 | 1737 | struct net_device *dev, *aux; |
3e6c9fb5 PE |
1738 | int h; |
1739 | struct ip6_tnl *t; | |
cf4432f5 | 1740 | LIST_HEAD(list); |
3e6c9fb5 | 1741 | |
0bd87628 ND |
1742 | for_each_netdev_safe(net, dev, aux) |
1743 | if (dev->rtnl_link_ops == &ip6_link_ops) | |
1744 | unregister_netdevice_queue(dev, &list); | |
1745 | ||
3e6c9fb5 | 1746 | for (h = 0; h < HASH_SIZE; h++) { |
94767632 | 1747 | t = rtnl_dereference(ip6n->tnls_r_l[h]); |
cf4432f5 | 1748 | while (t != NULL) { |
0bd87628 ND |
1749 | /* If dev is in the same netns, it has already |
1750 | * been added to the list by the previous loop. | |
1751 | */ | |
1752 | if (!net_eq(dev_net(t->dev), net)) | |
1753 | unregister_netdevice_queue(t->dev, &list); | |
94767632 | 1754 | t = rtnl_dereference(t->next); |
cf4432f5 | 1755 | } |
3e6c9fb5 PE |
1756 | } |
1757 | ||
cf4432f5 | 1758 | unregister_netdevice_many(&list); |
3e6c9fb5 PE |
1759 | } |
1760 | ||
2c8c1e72 | 1761 | static int __net_init ip6_tnl_init_net(struct net *net) |
13eeb8e9 | 1762 | { |
ac31cd3c | 1763 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
731abb9c | 1764 | struct ip6_tnl *t = NULL; |
13eeb8e9 | 1765 | int err; |
13eeb8e9 | 1766 | |
3e6c9fb5 PE |
1767 | ip6n->tnls[0] = ip6n->tnls_wc; |
1768 | ip6n->tnls[1] = ip6n->tnls_r_l; | |
1769 | ||
15820e12 PE |
1770 | err = -ENOMEM; |
1771 | ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", | |
1772 | ip6_tnl_dev_setup); | |
1773 | ||
1774 | if (!ip6n->fb_tnl_dev) | |
1775 | goto err_alloc_dev; | |
be77e593 | 1776 | dev_net_set(ip6n->fb_tnl_dev, net); |
bb814094 | 1777 | ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops; |
0bd87628 ND |
1778 | /* FB netdevice is special: we have one, and only one per netns. |
1779 | * Allowing to move it to another netns is clearly unsafe. | |
1780 | */ | |
1781 | ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL; | |
15820e12 | 1782 | |
8560f226 ED |
1783 | err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); |
1784 | if (err < 0) | |
1785 | goto err_register; | |
15820e12 PE |
1786 | |
1787 | err = register_netdev(ip6n->fb_tnl_dev); | |
1788 | if (err < 0) | |
1789 | goto err_register; | |
731abb9c JB |
1790 | |
1791 | t = netdev_priv(ip6n->fb_tnl_dev); | |
1792 | ||
1793 | strcpy(t->parms.name, ip6n->fb_tnl_dev->name); | |
13eeb8e9 PE |
1794 | return 0; |
1795 | ||
15820e12 | 1796 | err_register: |
8560f226 | 1797 | ip6_dev_free(ip6n->fb_tnl_dev); |
15820e12 | 1798 | err_alloc_dev: |
13eeb8e9 PE |
1799 | return err; |
1800 | } | |
1801 | ||
2c8c1e72 | 1802 | static void __net_exit ip6_tnl_exit_net(struct net *net) |
13eeb8e9 | 1803 | { |
3e6c9fb5 | 1804 | rtnl_lock(); |
1e9f3d6f | 1805 | ip6_tnl_destroy_tunnels(net); |
3e6c9fb5 | 1806 | rtnl_unlock(); |
13eeb8e9 PE |
1807 | } |
1808 | ||
1809 | static struct pernet_operations ip6_tnl_net_ops = { | |
1810 | .init = ip6_tnl_init_net, | |
1811 | .exit = ip6_tnl_exit_net, | |
ac31cd3c EB |
1812 | .id = &ip6_tnl_net_id, |
1813 | .size = sizeof(struct ip6_tnl_net), | |
13eeb8e9 PE |
1814 | }; |
1815 | ||
1da177e4 LT |
1816 | /** |
1817 | * ip6_tunnel_init - register protocol and reserve needed resources | |
1818 | * | |
1819 | * Return: 0 on success | |
1820 | **/ | |
1821 | ||
1822 | static int __init ip6_tunnel_init(void) | |
1823 | { | |
1824 | int err; | |
1825 | ||
d5aa407f AD |
1826 | err = register_pernet_device(&ip6_tnl_net_ops); |
1827 | if (err < 0) | |
1828 | goto out_pernet; | |
1829 | ||
1830 | err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET); | |
1831 | if (err < 0) { | |
f3213831 | 1832 | pr_err("%s: can't register ip4ip6\n", __func__); |
d5aa407f | 1833 | goto out_ip4ip6; |
c4d3efaf YK |
1834 | } |
1835 | ||
d5aa407f AD |
1836 | err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6); |
1837 | if (err < 0) { | |
f3213831 | 1838 | pr_err("%s: can't register ip6ip6\n", __func__); |
d5aa407f | 1839 | goto out_ip6ip6; |
1da177e4 | 1840 | } |
c075b130 ND |
1841 | err = rtnl_link_register(&ip6_link_ops); |
1842 | if (err < 0) | |
1843 | goto rtnl_link_failed; | |
13eeb8e9 | 1844 | |
1da177e4 | 1845 | return 0; |
d5aa407f | 1846 | |
c075b130 ND |
1847 | rtnl_link_failed: |
1848 | xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6); | |
d5aa407f | 1849 | out_ip6ip6: |
c4d3efaf | 1850 | xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); |
d5aa407f AD |
1851 | out_ip4ip6: |
1852 | unregister_pernet_device(&ip6_tnl_net_ops); | |
1853 | out_pernet: | |
1da177e4 LT |
1854 | return err; |
1855 | } | |
1856 | ||
1857 | /** | |
1858 | * ip6_tunnel_cleanup - free resources and unregister protocol | |
1859 | **/ | |
1860 | ||
1861 | static void __exit ip6_tunnel_cleanup(void) | |
1862 | { | |
c075b130 | 1863 | rtnl_link_unregister(&ip6_link_ops); |
c4d3efaf | 1864 | if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) |
f3213831 | 1865 | pr_info("%s: can't deregister ip4ip6\n", __func__); |
c4d3efaf | 1866 | |
73d605d1 | 1867 | if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) |
f3213831 | 1868 | pr_info("%s: can't deregister ip6ip6\n", __func__); |
1da177e4 | 1869 | |
ac31cd3c | 1870 | unregister_pernet_device(&ip6_tnl_net_ops); |
1da177e4 LT |
1871 | } |
1872 | ||
1873 | module_init(ip6_tunnel_init); | |
1874 | module_exit(ip6_tunnel_cleanup); |