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 | ||
ddbe5032 ED |
72 | #define HASH_SIZE_SHIFT 5 |
73 | #define HASH_SIZE (1 << HASH_SIZE_SHIFT) | |
1da177e4 | 74 | |
f4e0b4c5 ND |
75 | static bool log_ecn_error = true; |
76 | module_param(log_ecn_error, bool, 0644); | |
77 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); | |
78 | ||
ddbe5032 ED |
79 | static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2) |
80 | { | |
81 | u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2); | |
82 | ||
83 | return hash_32(hash, HASH_SIZE_SHIFT); | |
84 | } | |
1da177e4 | 85 | |
8560f226 | 86 | static int ip6_tnl_dev_init(struct net_device *dev); |
3144581c | 87 | static void ip6_tnl_dev_setup(struct net_device *dev); |
c075b130 | 88 | static struct rtnl_link_ops ip6_link_ops __read_mostly; |
1da177e4 | 89 | |
f99189b1 | 90 | static int ip6_tnl_net_id __read_mostly; |
13eeb8e9 | 91 | struct ip6_tnl_net { |
15820e12 PE |
92 | /* the IPv6 tunnel fallback device */ |
93 | struct net_device *fb_tnl_dev; | |
3e6c9fb5 | 94 | /* lists for storing tunnels in use */ |
94767632 ED |
95 | struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE]; |
96 | struct ip6_tnl __rcu *tnls_wc[1]; | |
97 | struct ip6_tnl __rcu **tnls[2]; | |
13eeb8e9 PE |
98 | }; |
99 | ||
8560f226 ED |
100 | static struct net_device_stats *ip6_get_stats(struct net_device *dev) |
101 | { | |
56a4342d | 102 | struct pcpu_sw_netstats tmp, sum = { 0 }; |
8560f226 ED |
103 | int i; |
104 | ||
105 | for_each_possible_cpu(i) { | |
abb6013c | 106 | unsigned int start; |
8f84985f LR |
107 | const struct pcpu_sw_netstats *tstats = |
108 | per_cpu_ptr(dev->tstats, i); | |
8560f226 | 109 | |
abb6013c | 110 | do { |
57a7744e | 111 | start = u64_stats_fetch_begin_irq(&tstats->syncp); |
abb6013c LR |
112 | tmp.rx_packets = tstats->rx_packets; |
113 | tmp.rx_bytes = tstats->rx_bytes; | |
114 | tmp.tx_packets = tstats->tx_packets; | |
115 | tmp.tx_bytes = tstats->tx_bytes; | |
57a7744e | 116 | } while (u64_stats_fetch_retry_irq(&tstats->syncp, start)); |
abb6013c LR |
117 | |
118 | sum.rx_packets += tmp.rx_packets; | |
119 | sum.rx_bytes += tmp.rx_bytes; | |
120 | sum.tx_packets += tmp.tx_packets; | |
121 | sum.tx_bytes += tmp.tx_bytes; | |
8560f226 ED |
122 | } |
123 | dev->stats.rx_packets = sum.rx_packets; | |
124 | dev->stats.rx_bytes = sum.rx_bytes; | |
125 | dev->stats.tx_packets = sum.tx_packets; | |
126 | dev->stats.tx_bytes = sum.tx_bytes; | |
127 | return &dev->stats; | |
128 | } | |
129 | ||
2922bc8a | 130 | /* |
94767632 | 131 | * Locking : hash tables are protected by RCU and RTNL |
2922bc8a | 132 | */ |
1da177e4 | 133 | |
c12b395a | 134 | struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t) |
1da177e4 LT |
135 | { |
136 | struct dst_entry *dst = t->dst_cache; | |
137 | ||
1ab1457c | 138 | if (dst && dst->obsolete && |
1da177e4 LT |
139 | dst->ops->check(dst, t->dst_cookie) == NULL) { |
140 | t->dst_cache = NULL; | |
141 | dst_release(dst); | |
142 | return NULL; | |
143 | } | |
144 | ||
145 | return dst; | |
146 | } | |
c12b395a | 147 | EXPORT_SYMBOL_GPL(ip6_tnl_dst_check); |
1da177e4 | 148 | |
c12b395a | 149 | void ip6_tnl_dst_reset(struct ip6_tnl *t) |
1da177e4 LT |
150 | { |
151 | dst_release(t->dst_cache); | |
152 | t->dst_cache = NULL; | |
153 | } | |
c12b395a | 154 | EXPORT_SYMBOL_GPL(ip6_tnl_dst_reset); |
1da177e4 | 155 | |
c12b395a | 156 | void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst) |
1da177e4 LT |
157 | { |
158 | struct rt6_info *rt = (struct rt6_info *) dst; | |
159 | t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0; | |
160 | dst_release(t->dst_cache); | |
161 | t->dst_cache = dst; | |
162 | } | |
c12b395a | 163 | EXPORT_SYMBOL_GPL(ip6_tnl_dst_store); |
1da177e4 LT |
164 | |
165 | /** | |
3144581c | 166 | * ip6_tnl_lookup - fetch tunnel matching the end-point addresses |
1ab1457c YH |
167 | * @remote: the address of the tunnel exit-point |
168 | * @local: the address of the tunnel entry-point | |
1da177e4 | 169 | * |
1ab1457c | 170 | * Return: |
1da177e4 | 171 | * tunnel matching given end-points if found, |
1ab1457c | 172 | * else fallback tunnel if its device is up, |
1da177e4 LT |
173 | * else %NULL |
174 | **/ | |
175 | ||
2922bc8a ED |
176 | #define for_each_ip6_tunnel_rcu(start) \ |
177 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) | |
178 | ||
1da177e4 | 179 | static struct ip6_tnl * |
b71d1d42 | 180 | ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local) |
1da177e4 | 181 | { |
ddbe5032 | 182 | unsigned int hash = HASH(remote, local); |
1da177e4 | 183 | struct ip6_tnl *t; |
3e6c9fb5 | 184 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 185 | |
ddbe5032 | 186 | for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { |
1da177e4 LT |
187 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
188 | ipv6_addr_equal(remote, &t->parms.raddr) && | |
189 | (t->dev->flags & IFF_UP)) | |
190 | return t; | |
191 | } | |
2922bc8a ED |
192 | t = rcu_dereference(ip6n->tnls_wc[0]); |
193 | if (t && (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
194 | return t; |
195 | ||
196 | return NULL; | |
197 | } | |
198 | ||
199 | /** | |
3144581c | 200 | * ip6_tnl_bucket - get head of list matching given tunnel parameters |
1ab1457c | 201 | * @p: parameters containing tunnel end-points |
1da177e4 LT |
202 | * |
203 | * Description: | |
3144581c | 204 | * ip6_tnl_bucket() returns the head of the list matching the |
1da177e4 LT |
205 | * &struct in6_addr entries laddr and raddr in @p. |
206 | * | |
1ab1457c | 207 | * Return: head of IPv6 tunnel list |
1da177e4 LT |
208 | **/ |
209 | ||
94767632 | 210 | static struct ip6_tnl __rcu ** |
c12b395a | 211 | ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p) |
1da177e4 | 212 | { |
b71d1d42 ED |
213 | const struct in6_addr *remote = &p->raddr; |
214 | const struct in6_addr *local = &p->laddr; | |
95c96174 | 215 | unsigned int h = 0; |
1da177e4 LT |
216 | int prio = 0; |
217 | ||
218 | if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { | |
219 | prio = 1; | |
ddbe5032 | 220 | h = HASH(remote, local); |
1da177e4 | 221 | } |
3e6c9fb5 | 222 | return &ip6n->tnls[prio][h]; |
1da177e4 LT |
223 | } |
224 | ||
225 | /** | |
3144581c | 226 | * ip6_tnl_link - add tunnel to hash table |
1da177e4 LT |
227 | * @t: tunnel to be added |
228 | **/ | |
229 | ||
230 | static void | |
2dd02c89 | 231 | ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 232 | { |
94767632 | 233 | struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms); |
1da177e4 | 234 | |
cf778b00 ED |
235 | rcu_assign_pointer(t->next , rtnl_dereference(*tp)); |
236 | rcu_assign_pointer(*tp, t); | |
1da177e4 LT |
237 | } |
238 | ||
239 | /** | |
3144581c | 240 | * ip6_tnl_unlink - remove tunnel from hash table |
1da177e4 LT |
241 | * @t: tunnel to be removed |
242 | **/ | |
243 | ||
244 | static void | |
2dd02c89 | 245 | ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 246 | { |
94767632 ED |
247 | struct ip6_tnl __rcu **tp; |
248 | struct ip6_tnl *iter; | |
249 | ||
250 | for (tp = ip6_tnl_bucket(ip6n, &t->parms); | |
251 | (iter = rtnl_dereference(*tp)) != NULL; | |
252 | tp = &iter->next) { | |
253 | if (t == iter) { | |
cf778b00 | 254 | rcu_assign_pointer(*tp, t->next); |
1da177e4 LT |
255 | break; |
256 | } | |
257 | } | |
258 | } | |
259 | ||
8560f226 ED |
260 | static void ip6_dev_free(struct net_device *dev) |
261 | { | |
262 | free_percpu(dev->tstats); | |
263 | free_netdev(dev); | |
264 | } | |
265 | ||
0b112457 ND |
266 | static int ip6_tnl_create2(struct net_device *dev) |
267 | { | |
268 | struct ip6_tnl *t = netdev_priv(dev); | |
269 | struct net *net = dev_net(dev); | |
270 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
271 | int err; | |
272 | ||
273 | t = netdev_priv(dev); | |
274 | err = ip6_tnl_dev_init(dev); | |
275 | if (err < 0) | |
276 | goto out; | |
277 | ||
278 | err = register_netdevice(dev); | |
279 | if (err < 0) | |
280 | goto out; | |
281 | ||
282 | strcpy(t->parms.name, dev->name); | |
283 | dev->rtnl_link_ops = &ip6_link_ops; | |
284 | ||
285 | dev_hold(dev); | |
286 | ip6_tnl_link(ip6n, t); | |
287 | return 0; | |
288 | ||
289 | out: | |
290 | return err; | |
291 | } | |
292 | ||
1da177e4 | 293 | /** |
2c53040f | 294 | * ip6_tnl_create - create a new tunnel |
1da177e4 LT |
295 | * @p: tunnel parameters |
296 | * @pt: pointer to new tunnel | |
297 | * | |
298 | * Description: | |
299 | * Create tunnel matching given parameters. | |
1ab1457c YH |
300 | * |
301 | * Return: | |
567131a7 | 302 | * created tunnel or NULL |
1da177e4 LT |
303 | **/ |
304 | ||
c12b395a | 305 | static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p) |
1da177e4 LT |
306 | { |
307 | struct net_device *dev; | |
308 | struct ip6_tnl *t; | |
309 | char name[IFNAMSIZ]; | |
310 | int err; | |
311 | ||
34cc7ba6 | 312 | if (p->name[0]) |
1da177e4 | 313 | strlcpy(name, p->name, IFNAMSIZ); |
34cc7ba6 PE |
314 | else |
315 | sprintf(name, "ip6tnl%%d"); | |
316 | ||
3144581c | 317 | dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup); |
1da177e4 | 318 | if (dev == NULL) |
567131a7 | 319 | goto failed; |
1da177e4 | 320 | |
554eb277 PE |
321 | dev_net_set(dev, net); |
322 | ||
2941a486 | 323 | t = netdev_priv(dev); |
1da177e4 | 324 | t->parms = *p; |
0bd87628 | 325 | t->net = dev_net(dev); |
0b112457 | 326 | err = ip6_tnl_create2(dev); |
8560f226 ED |
327 | if (err < 0) |
328 | goto failed_free; | |
1da177e4 | 329 | |
567131a7 | 330 | return t; |
b37d428b PE |
331 | |
332 | failed_free: | |
8560f226 | 333 | ip6_dev_free(dev); |
567131a7 VN |
334 | failed: |
335 | return NULL; | |
1da177e4 LT |
336 | } |
337 | ||
338 | /** | |
3144581c | 339 | * ip6_tnl_locate - find or create tunnel matching given parameters |
1ab1457c | 340 | * @p: tunnel parameters |
1da177e4 LT |
341 | * @create: != 0 if allowed to create new tunnel if no match found |
342 | * | |
343 | * Description: | |
3144581c | 344 | * ip6_tnl_locate() first tries to locate an existing tunnel |
1da177e4 LT |
345 | * based on @parms. If this is unsuccessful, but @create is set a new |
346 | * tunnel device is created and registered for use. | |
347 | * | |
348 | * Return: | |
567131a7 | 349 | * matching tunnel or NULL |
1da177e4 LT |
350 | **/ |
351 | ||
2dd02c89 | 352 | static struct ip6_tnl *ip6_tnl_locate(struct net *net, |
c12b395a | 353 | struct __ip6_tnl_parm *p, int create) |
1da177e4 | 354 | { |
b71d1d42 ED |
355 | const struct in6_addr *remote = &p->raddr; |
356 | const struct in6_addr *local = &p->laddr; | |
94767632 | 357 | struct ip6_tnl __rcu **tp; |
1da177e4 | 358 | struct ip6_tnl *t; |
2dd02c89 | 359 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 360 | |
94767632 ED |
361 | for (tp = ip6_tnl_bucket(ip6n, p); |
362 | (t = rtnl_dereference(*tp)) != NULL; | |
363 | tp = &t->next) { | |
1da177e4 | 364 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
567131a7 VN |
365 | ipv6_addr_equal(remote, &t->parms.raddr)) |
366 | return t; | |
1da177e4 LT |
367 | } |
368 | if (!create) | |
567131a7 | 369 | return NULL; |
2dd02c89 | 370 | return ip6_tnl_create(net, p); |
1da177e4 LT |
371 | } |
372 | ||
373 | /** | |
3144581c | 374 | * ip6_tnl_dev_uninit - tunnel device uninitializer |
1da177e4 | 375 | * @dev: the device to be destroyed |
1ab1457c | 376 | * |
1da177e4 | 377 | * Description: |
3144581c | 378 | * ip6_tnl_dev_uninit() removes tunnel from its list |
1da177e4 LT |
379 | **/ |
380 | ||
381 | static void | |
3144581c | 382 | ip6_tnl_dev_uninit(struct net_device *dev) |
1da177e4 | 383 | { |
2941a486 | 384 | struct ip6_tnl *t = netdev_priv(dev); |
0bd87628 | 385 | struct net *net = t->net; |
2dd02c89 | 386 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 387 | |
94767632 | 388 | if (dev == ip6n->fb_tnl_dev) |
a9b3cd7f | 389 | RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL); |
94767632 | 390 | else |
2dd02c89 | 391 | ip6_tnl_unlink(ip6n, t); |
1da177e4 LT |
392 | ip6_tnl_dst_reset(t); |
393 | dev_put(dev); | |
394 | } | |
395 | ||
396 | /** | |
397 | * parse_tvl_tnl_enc_lim - handle encapsulation limit option | |
398 | * @skb: received socket buffer | |
399 | * | |
1ab1457c YH |
400 | * Return: |
401 | * 0 if none was found, | |
1da177e4 LT |
402 | * else index to encapsulation limit |
403 | **/ | |
404 | ||
c12b395a | 405 | __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw) |
1da177e4 | 406 | { |
b71d1d42 | 407 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw; |
1da177e4 LT |
408 | __u8 nexthdr = ipv6h->nexthdr; |
409 | __u16 off = sizeof (*ipv6h); | |
410 | ||
411 | while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { | |
412 | __u16 optlen = 0; | |
413 | struct ipv6_opt_hdr *hdr; | |
414 | if (raw + off + sizeof (*hdr) > skb->data && | |
415 | !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr))) | |
416 | break; | |
417 | ||
418 | hdr = (struct ipv6_opt_hdr *) (raw + off); | |
419 | if (nexthdr == NEXTHDR_FRAGMENT) { | |
420 | struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; | |
421 | if (frag_hdr->frag_off) | |
422 | break; | |
423 | optlen = 8; | |
424 | } else if (nexthdr == NEXTHDR_AUTH) { | |
425 | optlen = (hdr->hdrlen + 2) << 2; | |
426 | } else { | |
427 | optlen = ipv6_optlen(hdr); | |
428 | } | |
429 | if (nexthdr == NEXTHDR_DEST) { | |
430 | __u16 i = off + 2; | |
431 | while (1) { | |
432 | struct ipv6_tlv_tnl_enc_lim *tel; | |
433 | ||
434 | /* No more room for encapsulation limit */ | |
435 | if (i + sizeof (*tel) > off + optlen) | |
436 | break; | |
437 | ||
438 | tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i]; | |
439 | /* return index of option if found and valid */ | |
440 | if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && | |
441 | tel->length == 1) | |
442 | return i; | |
443 | /* else jump to next option */ | |
444 | if (tel->type) | |
445 | i += tel->length + 2; | |
446 | else | |
447 | i++; | |
448 | } | |
449 | } | |
450 | nexthdr = hdr->nexthdr; | |
451 | off += optlen; | |
452 | } | |
453 | return 0; | |
454 | } | |
c12b395a | 455 | EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim); |
1da177e4 LT |
456 | |
457 | /** | |
e490d1d8 | 458 | * ip6_tnl_err - tunnel error handler |
1da177e4 LT |
459 | * |
460 | * Description: | |
e490d1d8 | 461 | * ip6_tnl_err() should handle errors in the tunnel according |
1da177e4 LT |
462 | * to the specifications in RFC 2473. |
463 | **/ | |
464 | ||
d2acc347 | 465 | static int |
502b0935 | 466 | ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, |
d5fdd6ba | 467 | u8 *type, u8 *code, int *msg, __u32 *info, int offset) |
1da177e4 | 468 | { |
b71d1d42 | 469 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data; |
1da177e4 LT |
470 | struct ip6_tnl *t; |
471 | int rel_msg = 0; | |
d5fdd6ba BH |
472 | u8 rel_type = ICMPV6_DEST_UNREACH; |
473 | u8 rel_code = ICMPV6_ADDR_UNREACH; | |
1da177e4 LT |
474 | __u32 rel_info = 0; |
475 | __u16 len; | |
d2acc347 | 476 | int err = -ENOENT; |
1da177e4 | 477 | |
1ab1457c YH |
478 | /* If the packet doesn't contain the original IPv6 header we are |
479 | in trouble since we might need the source address for further | |
1da177e4 LT |
480 | processing of the error. */ |
481 | ||
2922bc8a | 482 | rcu_read_lock(); |
8704ca7e | 483 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, |
2dd02c89 | 484 | &ipv6h->saddr)) == NULL) |
1da177e4 LT |
485 | goto out; |
486 | ||
502b0935 YK |
487 | if (t->parms.proto != ipproto && t->parms.proto != 0) |
488 | goto out; | |
489 | ||
d2acc347 HX |
490 | err = 0; |
491 | ||
e490d1d8 | 492 | switch (*type) { |
1da177e4 LT |
493 | __u32 teli; |
494 | struct ipv6_tlv_tnl_enc_lim *tel; | |
495 | __u32 mtu; | |
496 | case ICMPV6_DEST_UNREACH: | |
e87cc472 JP |
497 | net_warn_ratelimited("%s: Path to destination invalid or inactive!\n", |
498 | t->parms.name); | |
1da177e4 LT |
499 | rel_msg = 1; |
500 | break; | |
501 | case ICMPV6_TIME_EXCEED: | |
e490d1d8 | 502 | if ((*code) == ICMPV6_EXC_HOPLIMIT) { |
e87cc472 JP |
503 | net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", |
504 | t->parms.name); | |
1da177e4 LT |
505 | rel_msg = 1; |
506 | } | |
507 | break; | |
508 | case ICMPV6_PARAMPROB: | |
107a5fe6 | 509 | teli = 0; |
e490d1d8 | 510 | if ((*code) == ICMPV6_HDR_FIELD) |
c12b395a | 511 | teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); |
1da177e4 | 512 | |
704eae1f | 513 | if (teli && teli == *info - 2) { |
1da177e4 LT |
514 | tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; |
515 | if (tel->encap_limit == 0) { | |
e87cc472 JP |
516 | net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", |
517 | t->parms.name); | |
1da177e4 LT |
518 | rel_msg = 1; |
519 | } | |
e87cc472 JP |
520 | } else { |
521 | net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n", | |
522 | t->parms.name); | |
1da177e4 LT |
523 | } |
524 | break; | |
525 | case ICMPV6_PKT_TOOBIG: | |
704eae1f | 526 | mtu = *info - offset; |
1da177e4 LT |
527 | if (mtu < IPV6_MIN_MTU) |
528 | mtu = IPV6_MIN_MTU; | |
529 | t->dev->mtu = mtu; | |
530 | ||
cc6cdac0 | 531 | if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) { |
1da177e4 LT |
532 | rel_type = ICMPV6_PKT_TOOBIG; |
533 | rel_code = 0; | |
534 | rel_info = mtu; | |
535 | rel_msg = 1; | |
536 | } | |
537 | break; | |
538 | } | |
e490d1d8 YK |
539 | |
540 | *type = rel_type; | |
541 | *code = rel_code; | |
542 | *info = rel_info; | |
543 | *msg = rel_msg; | |
544 | ||
545 | out: | |
2922bc8a | 546 | rcu_read_unlock(); |
e490d1d8 YK |
547 | return err; |
548 | } | |
549 | ||
c4d3efaf YK |
550 | static int |
551 | ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 552 | u8 type, u8 code, int offset, __be32 info) |
c4d3efaf YK |
553 | { |
554 | int rel_msg = 0; | |
d5fdd6ba BH |
555 | u8 rel_type = type; |
556 | u8 rel_code = code; | |
704eae1f | 557 | __u32 rel_info = ntohl(info); |
c4d3efaf YK |
558 | int err; |
559 | struct sk_buff *skb2; | |
b71d1d42 | 560 | const struct iphdr *eiph; |
c4d3efaf | 561 | struct rtable *rt; |
31e4543d | 562 | struct flowi4 fl4; |
c4d3efaf | 563 | |
502b0935 YK |
564 | err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, |
565 | &rel_msg, &rel_info, offset); | |
c4d3efaf YK |
566 | if (err < 0) |
567 | return err; | |
568 | ||
569 | if (rel_msg == 0) | |
570 | return 0; | |
571 | ||
572 | switch (rel_type) { | |
573 | case ICMPV6_DEST_UNREACH: | |
574 | if (rel_code != ICMPV6_ADDR_UNREACH) | |
575 | return 0; | |
576 | rel_type = ICMP_DEST_UNREACH; | |
577 | rel_code = ICMP_HOST_UNREACH; | |
578 | break; | |
579 | case ICMPV6_PKT_TOOBIG: | |
580 | if (rel_code != 0) | |
581 | return 0; | |
582 | rel_type = ICMP_DEST_UNREACH; | |
583 | rel_code = ICMP_FRAG_NEEDED; | |
584 | break; | |
ec18d9a2 DM |
585 | case NDISC_REDIRECT: |
586 | rel_type = ICMP_REDIRECT; | |
587 | rel_code = ICMP_REDIR_HOST; | |
c4d3efaf YK |
588 | default: |
589 | return 0; | |
590 | } | |
591 | ||
592 | if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) | |
593 | return 0; | |
594 | ||
595 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
596 | if (!skb2) | |
597 | return 0; | |
598 | ||
adf30907 ED |
599 | skb_dst_drop(skb2); |
600 | ||
c4d3efaf | 601 | skb_pull(skb2, offset); |
c1d2bbe1 | 602 | skb_reset_network_header(skb2); |
eddc9ec5 | 603 | eiph = ip_hdr(skb2); |
c4d3efaf YK |
604 | |
605 | /* Try to guess incoming interface */ | |
31e4543d | 606 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, |
78fbfd8a DM |
607 | eiph->saddr, 0, |
608 | 0, 0, | |
609 | IPPROTO_IPIP, RT_TOS(eiph->tos), 0); | |
b23dd4fe | 610 | if (IS_ERR(rt)) |
c4d3efaf YK |
611 | goto out; |
612 | ||
d8d1f30b | 613 | skb2->dev = rt->dst.dev; |
c4d3efaf YK |
614 | |
615 | /* route "incoming" packet */ | |
616 | if (rt->rt_flags & RTCF_LOCAL) { | |
617 | ip_rt_put(rt); | |
618 | rt = NULL; | |
31e4543d | 619 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, |
78fbfd8a DM |
620 | eiph->daddr, eiph->saddr, |
621 | 0, 0, | |
622 | IPPROTO_IPIP, | |
623 | RT_TOS(eiph->tos), 0); | |
b23dd4fe | 624 | if (IS_ERR(rt) || |
d8d1f30b | 625 | rt->dst.dev->type != ARPHRD_TUNNEL) { |
b23dd4fe DM |
626 | if (!IS_ERR(rt)) |
627 | ip_rt_put(rt); | |
c4d3efaf YK |
628 | goto out; |
629 | } | |
b23dd4fe | 630 | skb_dst_set(skb2, &rt->dst); |
c4d3efaf YK |
631 | } else { |
632 | ip_rt_put(rt); | |
633 | if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, | |
634 | skb2->dev) || | |
adf30907 | 635 | skb_dst(skb2)->dev->type != ARPHRD_TUNNEL) |
c4d3efaf YK |
636 | goto out; |
637 | } | |
638 | ||
639 | /* change mtu on this route */ | |
640 | if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { | |
adf30907 | 641 | if (rel_info > dst_mtu(skb_dst(skb2))) |
c4d3efaf YK |
642 | goto out; |
643 | ||
6700c270 | 644 | skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2, rel_info); |
c4d3efaf | 645 | } |
1ed5c48f | 646 | if (rel_type == ICMP_REDIRECT) |
6700c270 | 647 | skb_dst(skb2)->ops->redirect(skb_dst(skb2), NULL, skb2); |
c4d3efaf | 648 | |
704eae1f | 649 | icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); |
c4d3efaf YK |
650 | |
651 | out: | |
652 | kfree_skb(skb2); | |
653 | return 0; | |
654 | } | |
655 | ||
e490d1d8 YK |
656 | static int |
657 | ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 658 | u8 type, u8 code, int offset, __be32 info) |
e490d1d8 YK |
659 | { |
660 | int rel_msg = 0; | |
d5fdd6ba BH |
661 | u8 rel_type = type; |
662 | u8 rel_code = code; | |
704eae1f | 663 | __u32 rel_info = ntohl(info); |
e490d1d8 YK |
664 | int err; |
665 | ||
502b0935 YK |
666 | err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, |
667 | &rel_msg, &rel_info, offset); | |
e490d1d8 YK |
668 | if (err < 0) |
669 | return err; | |
670 | ||
671 | if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { | |
1da177e4 LT |
672 | struct rt6_info *rt; |
673 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
305d4b3c | 674 | |
1da177e4 | 675 | if (!skb2) |
e490d1d8 | 676 | return 0; |
1da177e4 | 677 | |
adf30907 | 678 | skb_dst_drop(skb2); |
1da177e4 | 679 | skb_pull(skb2, offset); |
c1d2bbe1 | 680 | skb_reset_network_header(skb2); |
1da177e4 LT |
681 | |
682 | /* Try to guess incoming interface */ | |
2f7f54b7 PE |
683 | rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, |
684 | NULL, 0, 0); | |
1da177e4 | 685 | |
d1918542 DM |
686 | if (rt && rt->dst.dev) |
687 | skb2->dev = rt->dst.dev; | |
1da177e4 | 688 | |
3ffe533c | 689 | icmpv6_send(skb2, rel_type, rel_code, rel_info); |
1da177e4 | 690 | |
94e187c0 | 691 | ip6_rt_put(rt); |
1da177e4 LT |
692 | |
693 | kfree_skb(skb2); | |
694 | } | |
e490d1d8 YK |
695 | |
696 | return 0; | |
1da177e4 LT |
697 | } |
698 | ||
f4e0b4c5 ND |
699 | static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
700 | const struct ipv6hdr *ipv6h, | |
701 | struct sk_buff *skb) | |
c4d3efaf YK |
702 | { |
703 | __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; | |
704 | ||
705 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) | |
eddc9ec5 | 706 | ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); |
c4d3efaf | 707 | |
f4e0b4c5 | 708 | return IP6_ECN_decapsulate(ipv6h, skb); |
c4d3efaf YK |
709 | } |
710 | ||
f4e0b4c5 ND |
711 | static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
712 | const struct ipv6hdr *ipv6h, | |
713 | struct sk_buff *skb) | |
1da177e4 | 714 | { |
8359925b | 715 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) |
29bb43b4 | 716 | ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); |
1da177e4 | 717 | |
f4e0b4c5 | 718 | return IP6_ECN_decapsulate(ipv6h, skb); |
1da177e4 | 719 | } |
8359925b | 720 | |
c12b395a | 721 | __u32 ip6_tnl_get_cap(struct ip6_tnl *t, |
d0087b29 VN |
722 | const struct in6_addr *laddr, |
723 | const struct in6_addr *raddr) | |
724 | { | |
c12b395a | 725 | struct __ip6_tnl_parm *p = &t->parms; |
d0087b29 VN |
726 | int ltype = ipv6_addr_type(laddr); |
727 | int rtype = ipv6_addr_type(raddr); | |
728 | __u32 flags = 0; | |
729 | ||
730 | if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) { | |
731 | flags = IP6_TNL_F_CAP_PER_PACKET; | |
732 | } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
733 | rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
734 | !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && | |
735 | (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { | |
736 | if (ltype&IPV6_ADDR_UNICAST) | |
737 | flags |= IP6_TNL_F_CAP_XMIT; | |
738 | if (rtype&IPV6_ADDR_UNICAST) | |
739 | flags |= IP6_TNL_F_CAP_RCV; | |
740 | } | |
741 | return flags; | |
742 | } | |
c12b395a | 743 | EXPORT_SYMBOL(ip6_tnl_get_cap); |
d0087b29 | 744 | |
f1a28eab | 745 | /* called with rcu_read_lock() */ |
c12b395a | 746 | int ip6_tnl_rcv_ctl(struct ip6_tnl *t, |
d0087b29 VN |
747 | const struct in6_addr *laddr, |
748 | const struct in6_addr *raddr) | |
09c6bbf0 | 749 | { |
c12b395a | 750 | struct __ip6_tnl_parm *p = &t->parms; |
09c6bbf0 | 751 | int ret = 0; |
0bd87628 | 752 | struct net *net = t->net; |
09c6bbf0 | 753 | |
d0087b29 VN |
754 | if ((p->flags & IP6_TNL_F_CAP_RCV) || |
755 | ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && | |
756 | (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) { | |
1ab1457c | 757 | struct net_device *ldev = NULL; |
09c6bbf0 VN |
758 | |
759 | if (p->link) | |
f1a28eab | 760 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 761 | |
d0087b29 VN |
762 | if ((ipv6_addr_is_multicast(laddr) || |
763 | likely(ipv6_chk_addr(net, laddr, ldev, 0))) && | |
764 | likely(!ipv6_chk_addr(net, raddr, NULL, 0))) | |
09c6bbf0 | 765 | ret = 1; |
09c6bbf0 VN |
766 | } |
767 | return ret; | |
768 | } | |
c12b395a | 769 | EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl); |
1da177e4 LT |
770 | |
771 | /** | |
3144581c | 772 | * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally |
1da177e4 | 773 | * @skb: received socket buffer |
8359925b YK |
774 | * @protocol: ethernet protocol ID |
775 | * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN | |
1da177e4 LT |
776 | * |
777 | * Return: 0 | |
778 | **/ | |
779 | ||
8359925b | 780 | static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol, |
502b0935 | 781 | __u8 ipproto, |
f4e0b4c5 ND |
782 | int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, |
783 | const struct ipv6hdr *ipv6h, | |
784 | struct sk_buff *skb)) | |
1da177e4 | 785 | { |
1da177e4 | 786 | struct ip6_tnl *t; |
b71d1d42 | 787 | const struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
f4e0b4c5 | 788 | int err; |
1da177e4 | 789 | |
2922bc8a | 790 | rcu_read_lock(); |
1da177e4 | 791 | |
8704ca7e | 792 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, |
2dd02c89 | 793 | &ipv6h->daddr)) != NULL) { |
8f84985f | 794 | struct pcpu_sw_netstats *tstats; |
8560f226 | 795 | |
502b0935 | 796 | if (t->parms.proto != ipproto && t->parms.proto != 0) { |
2922bc8a | 797 | rcu_read_unlock(); |
502b0935 YK |
798 | goto discard; |
799 | } | |
800 | ||
1da177e4 | 801 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
2922bc8a | 802 | rcu_read_unlock(); |
50fba2aa | 803 | goto discard; |
1da177e4 LT |
804 | } |
805 | ||
d0087b29 | 806 | if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) { |
3dca02af | 807 | t->dev->stats.rx_dropped++; |
2922bc8a | 808 | rcu_read_unlock(); |
1da177e4 LT |
809 | goto discard; |
810 | } | |
b0e380b1 | 811 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 812 | skb_reset_network_header(skb); |
8359925b | 813 | skb->protocol = htons(protocol); |
1da177e4 | 814 | memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); |
8359925b | 815 | |
ea23192e | 816 | __skb_tunnel_rx(skb, t->dev, t->net); |
f4e0b4c5 ND |
817 | |
818 | err = dscp_ecn_decapsulate(t, ipv6h, skb); | |
819 | if (unlikely(err)) { | |
820 | if (log_ecn_error) | |
821 | net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n", | |
822 | &ipv6h->saddr, | |
823 | ipv6_get_dsfield(ipv6h)); | |
824 | if (err > 1) { | |
825 | ++t->dev->stats.rx_frame_errors; | |
826 | ++t->dev->stats.rx_errors; | |
827 | rcu_read_unlock(); | |
828 | goto discard; | |
829 | } | |
830 | } | |
831 | ||
8560f226 | 832 | tstats = this_cpu_ptr(t->dev->tstats); |
abb6013c | 833 | u64_stats_update_begin(&tstats->syncp); |
8560f226 ED |
834 | tstats->rx_packets++; |
835 | tstats->rx_bytes += skb->len; | |
abb6013c | 836 | u64_stats_update_end(&tstats->syncp); |
8560f226 | 837 | |
caf586e5 | 838 | netif_rx(skb); |
8990f468 | 839 | |
2922bc8a | 840 | rcu_read_unlock(); |
1da177e4 LT |
841 | return 0; |
842 | } | |
2922bc8a | 843 | rcu_read_unlock(); |
1da177e4 | 844 | return 1; |
50fba2aa HX |
845 | |
846 | discard: | |
847 | kfree_skb(skb); | |
848 | return 0; | |
1da177e4 LT |
849 | } |
850 | ||
c4d3efaf YK |
851 | static int ip4ip6_rcv(struct sk_buff *skb) |
852 | { | |
502b0935 YK |
853 | return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP, |
854 | ip4ip6_dscp_ecn_decapsulate); | |
c4d3efaf YK |
855 | } |
856 | ||
8359925b YK |
857 | static int ip6ip6_rcv(struct sk_buff *skb) |
858 | { | |
502b0935 YK |
859 | return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6, |
860 | ip6ip6_dscp_ecn_decapsulate); | |
8359925b YK |
861 | } |
862 | ||
6fb32dde VN |
863 | struct ipv6_tel_txoption { |
864 | struct ipv6_txoptions ops; | |
865 | __u8 dst_opt[8]; | |
866 | }; | |
1da177e4 | 867 | |
6fb32dde VN |
868 | static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) |
869 | { | |
870 | memset(opt, 0, sizeof(struct ipv6_tel_txoption)); | |
1da177e4 | 871 | |
6fb32dde VN |
872 | opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; |
873 | opt->dst_opt[3] = 1; | |
874 | opt->dst_opt[4] = encap_limit; | |
875 | opt->dst_opt[5] = IPV6_TLV_PADN; | |
876 | opt->dst_opt[6] = 1; | |
1da177e4 | 877 | |
6fb32dde VN |
878 | opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; |
879 | opt->ops.opt_nflen = 8; | |
1da177e4 LT |
880 | } |
881 | ||
882 | /** | |
3144581c | 883 | * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own |
1da177e4 | 884 | * @t: the outgoing tunnel device |
1ab1457c | 885 | * @hdr: IPv6 header from the incoming packet |
1da177e4 LT |
886 | * |
887 | * Description: | |
1ab1457c | 888 | * Avoid trivial tunneling loop by checking that tunnel exit-point |
1da177e4 LT |
889 | * doesn't match source of incoming packet. |
890 | * | |
1ab1457c | 891 | * Return: |
1da177e4 LT |
892 | * 1 if conflict, |
893 | * 0 else | |
894 | **/ | |
895 | ||
92113bfd | 896 | static inline bool |
b71d1d42 | 897 | ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) |
1da177e4 LT |
898 | { |
899 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
900 | } | |
901 | ||
c12b395a | 902 | int ip6_tnl_xmit_ctl(struct ip6_tnl *t) |
09c6bbf0 | 903 | { |
c12b395a | 904 | struct __ip6_tnl_parm *p = &t->parms; |
09c6bbf0 | 905 | int ret = 0; |
0bd87628 | 906 | struct net *net = t->net; |
09c6bbf0 | 907 | |
1ab1457c | 908 | if (p->flags & IP6_TNL_F_CAP_XMIT) { |
09c6bbf0 VN |
909 | struct net_device *ldev = NULL; |
910 | ||
f1a28eab | 911 | rcu_read_lock(); |
09c6bbf0 | 912 | if (p->link) |
f1a28eab | 913 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 914 | |
2f7f54b7 | 915 | if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0))) |
f3213831 JP |
916 | pr_warn("%s xmit: Local address not yet configured!\n", |
917 | p->name); | |
09c6bbf0 | 918 | else if (!ipv6_addr_is_multicast(&p->raddr) && |
2f7f54b7 | 919 | unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0))) |
f3213831 JP |
920 | pr_warn("%s xmit: Routing loop! Remote address found on this node!\n", |
921 | p->name); | |
09c6bbf0 VN |
922 | else |
923 | ret = 1; | |
f1a28eab | 924 | rcu_read_unlock(); |
09c6bbf0 VN |
925 | } |
926 | return ret; | |
927 | } | |
c12b395a | 928 | EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl); |
929 | ||
1da177e4 | 930 | /** |
61ec2aec | 931 | * ip6_tnl_xmit2 - encapsulate packet and send |
1da177e4 | 932 | * @skb: the outgoing socket buffer |
1ab1457c | 933 | * @dev: the outgoing tunnel device |
61ec2aec YK |
934 | * @dsfield: dscp code for outer header |
935 | * @fl: flow of tunneled packet | |
936 | * @encap_limit: encapsulation limit | |
937 | * @pmtu: Path MTU is stored if packet is too big | |
1da177e4 LT |
938 | * |
939 | * Description: | |
940 | * Build new header and do some sanity checks on the packet before sending | |
941 | * it. | |
942 | * | |
1ab1457c | 943 | * Return: |
c4d3efaf | 944 | * 0 on success |
61ec2aec YK |
945 | * -1 fail |
946 | * %-EMSGSIZE message too big. return mtu in this case. | |
1da177e4 LT |
947 | **/ |
948 | ||
61ec2aec YK |
949 | static int ip6_tnl_xmit2(struct sk_buff *skb, |
950 | struct net_device *dev, | |
951 | __u8 dsfield, | |
4c9483b2 | 952 | struct flowi6 *fl6, |
61ec2aec YK |
953 | int encap_limit, |
954 | __u32 *pmtu) | |
1da177e4 | 955 | { |
2941a486 | 956 | struct ip6_tnl *t = netdev_priv(dev); |
0bd87628 | 957 | struct net *net = t->net; |
3dca02af | 958 | struct net_device_stats *stats = &t->dev->stats; |
0660e03f | 959 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
6fb32dde | 960 | struct ipv6_tel_txoption opt; |
d24f22f3 | 961 | struct dst_entry *dst = NULL, *ndst = NULL; |
1da177e4 LT |
962 | struct net_device *tdev; |
963 | int mtu; | |
c2636b4d | 964 | unsigned int max_headroom = sizeof(struct ipv6hdr); |
1da177e4 | 965 | u8 proto; |
61ec2aec | 966 | int err = -1; |
1da177e4 | 967 | |
d24f22f3 ED |
968 | if (!fl6->flowi6_mark) |
969 | dst = ip6_tnl_dst_check(t); | |
89b02126 ED |
970 | if (!dst) { |
971 | ndst = ip6_route_output(net, NULL, fl6); | |
1da177e4 | 972 | |
89b02126 | 973 | if (ndst->error) |
a57ebc90 | 974 | goto tx_err_link_failure; |
89b02126 ED |
975 | ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0); |
976 | if (IS_ERR(ndst)) { | |
977 | err = PTR_ERR(ndst); | |
978 | ndst = NULL; | |
452edd59 DM |
979 | goto tx_err_link_failure; |
980 | } | |
89b02126 | 981 | dst = ndst; |
a57ebc90 | 982 | } |
1da177e4 LT |
983 | |
984 | tdev = dst->dev; | |
985 | ||
986 | if (tdev == dev) { | |
987 | stats->collisions++; | |
e87cc472 JP |
988 | net_warn_ratelimited("%s: Local routing loop detected!\n", |
989 | t->parms.name); | |
1da177e4 LT |
990 | goto tx_err_dst_release; |
991 | } | |
992 | mtu = dst_mtu(dst) - sizeof (*ipv6h); | |
6fb32dde | 993 | if (encap_limit >= 0) { |
1da177e4 LT |
994 | max_headroom += 8; |
995 | mtu -= 8; | |
996 | } | |
997 | if (mtu < IPV6_MIN_MTU) | |
998 | mtu = IPV6_MIN_MTU; | |
adf30907 | 999 | if (skb_dst(skb)) |
6700c270 | 1000 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); |
1da177e4 | 1001 | if (skb->len > mtu) { |
61ec2aec YK |
1002 | *pmtu = mtu; |
1003 | err = -EMSGSIZE; | |
1da177e4 LT |
1004 | goto tx_err_dst_release; |
1005 | } | |
1006 | ||
963a88b3 | 1007 | skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev))); |
0bd87628 | 1008 | |
1da177e4 LT |
1009 | /* |
1010 | * Okay, now see if we can stuff it in the buffer as-is. | |
1011 | */ | |
1012 | max_headroom += LL_RESERVED_SPACE(tdev); | |
1ab1457c | 1013 | |
cfbba49d PM |
1014 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
1015 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 | 1016 | struct sk_buff *new_skb; |
1ab1457c | 1017 | |
1da177e4 LT |
1018 | if (!(new_skb = skb_realloc_headroom(skb, max_headroom))) |
1019 | goto tx_err_dst_release; | |
1020 | ||
1021 | if (skb->sk) | |
1022 | skb_set_owner_w(new_skb, skb->sk); | |
9ff26449 | 1023 | consume_skb(skb); |
1da177e4 LT |
1024 | skb = new_skb; |
1025 | } | |
d24f22f3 ED |
1026 | if (fl6->flowi6_mark) { |
1027 | skb_dst_set(skb, dst); | |
1028 | ndst = NULL; | |
1029 | } else { | |
1030 | skb_dst_set_noref(skb, dst); | |
1031 | } | |
b0e380b1 | 1032 | skb->transport_header = skb->network_header; |
1da177e4 | 1033 | |
4c9483b2 | 1034 | proto = fl6->flowi6_proto; |
6fb32dde VN |
1035 | if (encap_limit >= 0) { |
1036 | init_tel_txopt(&opt, encap_limit); | |
1037 | ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); | |
1038 | } | |
3d483058 HFS |
1039 | |
1040 | if (likely(!skb->encapsulation)) { | |
1041 | skb_reset_inner_headers(skb); | |
1042 | skb->encapsulation = 1; | |
1043 | } | |
1044 | ||
e2d1bca7 ACM |
1045 | skb_push(skb, sizeof(struct ipv6hdr)); |
1046 | skb_reset_network_header(skb); | |
0660e03f | 1047 | ipv6h = ipv6_hdr(skb); |
3e4e4c1f | 1048 | ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), fl6->flowlabel); |
1da177e4 LT |
1049 | ipv6h->hop_limit = t->parms.hop_limit; |
1050 | ipv6h->nexthdr = proto; | |
4e3fd7a0 AD |
1051 | ipv6h->saddr = fl6->saddr; |
1052 | ipv6h->daddr = fl6->daddr; | |
e8f72ea4 | 1053 | ip6tunnel_xmit(skb, dev); |
89b02126 ED |
1054 | if (ndst) |
1055 | ip6_tnl_dst_store(t, ndst); | |
1da177e4 LT |
1056 | return 0; |
1057 | tx_err_link_failure: | |
1058 | stats->tx_carrier_errors++; | |
1059 | dst_link_failure(skb); | |
1060 | tx_err_dst_release: | |
89b02126 | 1061 | dst_release(ndst); |
61ec2aec YK |
1062 | return err; |
1063 | } | |
1064 | ||
c4d3efaf YK |
1065 | static inline int |
1066 | ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1067 | { | |
1068 | struct ip6_tnl *t = netdev_priv(dev); | |
b71d1d42 | 1069 | const struct iphdr *iph = ip_hdr(skb); |
c4d3efaf | 1070 | int encap_limit = -1; |
4c9483b2 | 1071 | struct flowi6 fl6; |
c4d3efaf YK |
1072 | __u8 dsfield; |
1073 | __u32 mtu; | |
1074 | int err; | |
1075 | ||
502b0935 YK |
1076 | if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) || |
1077 | !ip6_tnl_xmit_ctl(t)) | |
c4d3efaf YK |
1078 | return -1; |
1079 | ||
1080 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1081 | encap_limit = t->parms.encap_limit; | |
1082 | ||
4c9483b2 DM |
1083 | memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6)); |
1084 | fl6.flowi6_proto = IPPROTO_IPIP; | |
c4d3efaf YK |
1085 | |
1086 | dsfield = ipv4_get_dsfield(iph); | |
1087 | ||
d24f22f3 | 1088 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
4c9483b2 | 1089 | fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) |
b77f2fa6 | 1090 | & IPV6_TCLASS_MASK; |
d24f22f3 ED |
1091 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
1092 | fl6.flowi6_mark = skb->mark; | |
c4d3efaf | 1093 | |
4c9483b2 | 1094 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); |
c4d3efaf YK |
1095 | if (err != 0) { |
1096 | /* XXX: send ICMP error even if DF is not set. */ | |
1097 | if (err == -EMSGSIZE) | |
1098 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
1099 | htonl(mtu)); | |
1100 | return -1; | |
1101 | } | |
1102 | ||
1103 | return 0; | |
1104 | } | |
1105 | ||
61ec2aec YK |
1106 | static inline int |
1107 | ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1108 | { | |
1109 | struct ip6_tnl *t = netdev_priv(dev); | |
0660e03f | 1110 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
61ec2aec YK |
1111 | int encap_limit = -1; |
1112 | __u16 offset; | |
4c9483b2 | 1113 | struct flowi6 fl6; |
61ec2aec YK |
1114 | __u8 dsfield; |
1115 | __u32 mtu; | |
1116 | int err; | |
1117 | ||
502b0935 YK |
1118 | if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) || |
1119 | !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h)) | |
61ec2aec YK |
1120 | return -1; |
1121 | ||
c12b395a | 1122 | offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); |
d56f90a7 | 1123 | if (offset > 0) { |
61ec2aec | 1124 | struct ipv6_tlv_tnl_enc_lim *tel; |
d56f90a7 | 1125 | tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; |
61ec2aec YK |
1126 | if (tel->encap_limit == 0) { |
1127 | icmpv6_send(skb, ICMPV6_PARAMPROB, | |
3ffe533c | 1128 | ICMPV6_HDR_FIELD, offset + 2); |
61ec2aec YK |
1129 | return -1; |
1130 | } | |
1131 | encap_limit = tel->encap_limit - 1; | |
1132 | } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1133 | encap_limit = t->parms.encap_limit; | |
1134 | ||
4c9483b2 DM |
1135 | memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6)); |
1136 | fl6.flowi6_proto = IPPROTO_IPV6; | |
61ec2aec YK |
1137 | |
1138 | dsfield = ipv6_get_dsfield(ipv6h); | |
d24f22f3 | 1139 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
4c9483b2 | 1140 | fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); |
d24f22f3 | 1141 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) |
3308de2b | 1142 | fl6.flowlabel |= ip6_flowlabel(ipv6h); |
d24f22f3 ED |
1143 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
1144 | fl6.flowi6_mark = skb->mark; | |
61ec2aec | 1145 | |
4c9483b2 | 1146 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); |
61ec2aec YK |
1147 | if (err != 0) { |
1148 | if (err == -EMSGSIZE) | |
3ffe533c | 1149 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
61ec2aec YK |
1150 | return -1; |
1151 | } | |
1152 | ||
1153 | return 0; | |
1154 | } | |
1155 | ||
6fef4c0c | 1156 | static netdev_tx_t |
61ec2aec YK |
1157 | ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) |
1158 | { | |
1159 | struct ip6_tnl *t = netdev_priv(dev); | |
3dca02af | 1160 | struct net_device_stats *stats = &t->dev->stats; |
61ec2aec YK |
1161 | int ret; |
1162 | ||
61ec2aec | 1163 | switch (skb->protocol) { |
60678040 | 1164 | case htons(ETH_P_IP): |
c4d3efaf YK |
1165 | ret = ip4ip6_tnl_xmit(skb, dev); |
1166 | break; | |
60678040 | 1167 | case htons(ETH_P_IPV6): |
61ec2aec YK |
1168 | ret = ip6ip6_tnl_xmit(skb, dev); |
1169 | break; | |
1170 | default: | |
1171 | goto tx_err; | |
1172 | } | |
1173 | ||
1174 | if (ret < 0) | |
1175 | goto tx_err; | |
1176 | ||
6ed10654 | 1177 | return NETDEV_TX_OK; |
61ec2aec | 1178 | |
1da177e4 LT |
1179 | tx_err: |
1180 | stats->tx_errors++; | |
1181 | stats->tx_dropped++; | |
1182 | kfree_skb(skb); | |
6ed10654 | 1183 | return NETDEV_TX_OK; |
1da177e4 LT |
1184 | } |
1185 | ||
3144581c | 1186 | static void ip6_tnl_link_config(struct ip6_tnl *t) |
1da177e4 LT |
1187 | { |
1188 | struct net_device *dev = t->dev; | |
c12b395a | 1189 | struct __ip6_tnl_parm *p = &t->parms; |
4c9483b2 | 1190 | struct flowi6 *fl6 = &t->fl.u.ip6; |
1da177e4 | 1191 | |
3a6d54c5 JP |
1192 | memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); |
1193 | memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
1da177e4 LT |
1194 | |
1195 | /* Set up flowi template */ | |
4e3fd7a0 AD |
1196 | fl6->saddr = p->laddr; |
1197 | fl6->daddr = p->raddr; | |
4c9483b2 DM |
1198 | fl6->flowi6_oif = p->link; |
1199 | fl6->flowlabel = 0; | |
1da177e4 LT |
1200 | |
1201 | if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) | |
4c9483b2 | 1202 | fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; |
1da177e4 | 1203 | if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) |
4c9483b2 | 1204 | fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; |
1da177e4 | 1205 | |
d0087b29 VN |
1206 | p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); |
1207 | p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); | |
1da177e4 LT |
1208 | |
1209 | if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) | |
1210 | dev->flags |= IFF_POINTOPOINT; | |
1211 | else | |
1212 | dev->flags &= ~IFF_POINTOPOINT; | |
1213 | ||
1214 | dev->iflink = p->link; | |
1215 | ||
1216 | if (p->flags & IP6_TNL_F_CAP_XMIT) { | |
305d4b3c VN |
1217 | int strict = (ipv6_addr_type(&p->raddr) & |
1218 | (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); | |
1219 | ||
0bd87628 | 1220 | struct rt6_info *rt = rt6_lookup(t->net, |
2f7f54b7 | 1221 | &p->raddr, &p->laddr, |
305d4b3c | 1222 | p->link, strict); |
1da177e4 LT |
1223 | |
1224 | if (rt == NULL) | |
1225 | return; | |
1226 | ||
d1918542 DM |
1227 | if (rt->dst.dev) { |
1228 | dev->hard_header_len = rt->dst.dev->hard_header_len + | |
1da177e4 LT |
1229 | sizeof (struct ipv6hdr); |
1230 | ||
d1918542 | 1231 | dev->mtu = rt->dst.dev->mtu - sizeof (struct ipv6hdr); |
381601e5 AF |
1232 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
1233 | dev->mtu-=8; | |
1da177e4 LT |
1234 | |
1235 | if (dev->mtu < IPV6_MIN_MTU) | |
1236 | dev->mtu = IPV6_MIN_MTU; | |
1237 | } | |
94e187c0 | 1238 | ip6_rt_put(rt); |
1da177e4 LT |
1239 | } |
1240 | } | |
1241 | ||
1242 | /** | |
3144581c | 1243 | * ip6_tnl_change - update the tunnel parameters |
1da177e4 LT |
1244 | * @t: tunnel to be changed |
1245 | * @p: tunnel configuration parameters | |
1da177e4 LT |
1246 | * |
1247 | * Description: | |
3144581c | 1248 | * ip6_tnl_change() updates the tunnel parameters |
1da177e4 LT |
1249 | **/ |
1250 | ||
1251 | static int | |
c12b395a | 1252 | ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) |
1da177e4 | 1253 | { |
4e3fd7a0 AD |
1254 | t->parms.laddr = p->laddr; |
1255 | t->parms.raddr = p->raddr; | |
1da177e4 LT |
1256 | t->parms.flags = p->flags; |
1257 | t->parms.hop_limit = p->hop_limit; | |
1258 | t->parms.encap_limit = p->encap_limit; | |
1259 | t->parms.flowinfo = p->flowinfo; | |
8181b8c1 | 1260 | t->parms.link = p->link; |
502b0935 | 1261 | t->parms.proto = p->proto; |
0c088890 | 1262 | ip6_tnl_dst_reset(t); |
3144581c | 1263 | ip6_tnl_link_config(t); |
1da177e4 LT |
1264 | return 0; |
1265 | } | |
1266 | ||
0b112457 ND |
1267 | static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) |
1268 | { | |
0bd87628 | 1269 | struct net *net = t->net; |
0b112457 ND |
1270 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1271 | int err; | |
1272 | ||
1273 | ip6_tnl_unlink(ip6n, t); | |
1274 | synchronize_net(); | |
1275 | err = ip6_tnl_change(t, p); | |
1276 | ip6_tnl_link(ip6n, t); | |
1277 | netdev_state_change(t->dev); | |
1278 | return err; | |
1279 | } | |
1280 | ||
c12b395a | 1281 | static void |
1282 | ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u) | |
1283 | { | |
1284 | p->laddr = u->laddr; | |
1285 | p->raddr = u->raddr; | |
1286 | p->flags = u->flags; | |
1287 | p->hop_limit = u->hop_limit; | |
1288 | p->encap_limit = u->encap_limit; | |
1289 | p->flowinfo = u->flowinfo; | |
1290 | p->link = u->link; | |
1291 | p->proto = u->proto; | |
1292 | memcpy(p->name, u->name, sizeof(u->name)); | |
1293 | } | |
1294 | ||
1295 | static void | |
1296 | ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p) | |
1297 | { | |
1298 | u->laddr = p->laddr; | |
1299 | u->raddr = p->raddr; | |
1300 | u->flags = p->flags; | |
1301 | u->hop_limit = p->hop_limit; | |
1302 | u->encap_limit = p->encap_limit; | |
1303 | u->flowinfo = p->flowinfo; | |
1304 | u->link = p->link; | |
1305 | u->proto = p->proto; | |
1306 | memcpy(u->name, p->name, sizeof(u->name)); | |
1307 | } | |
1308 | ||
1da177e4 | 1309 | /** |
3144581c | 1310 | * ip6_tnl_ioctl - configure ipv6 tunnels from userspace |
1da177e4 LT |
1311 | * @dev: virtual device associated with tunnel |
1312 | * @ifr: parameters passed from userspace | |
1313 | * @cmd: command to be performed | |
1314 | * | |
1315 | * Description: | |
3144581c | 1316 | * ip6_tnl_ioctl() is used for managing IPv6 tunnels |
1ab1457c | 1317 | * from userspace. |
1da177e4 LT |
1318 | * |
1319 | * The possible commands are the following: | |
1320 | * %SIOCGETTUNNEL: get tunnel parameters for device | |
1321 | * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters | |
1322 | * %SIOCCHGTUNNEL: change tunnel parameters to those given | |
1323 | * %SIOCDELTUNNEL: delete tunnel | |
1324 | * | |
1ab1457c | 1325 | * The fallback device "ip6tnl0", created during module |
1da177e4 LT |
1326 | * initialization, can be used for creating other tunnel devices. |
1327 | * | |
1328 | * Return: | |
1329 | * 0 on success, | |
1330 | * %-EFAULT if unable to copy data to or from userspace, | |
1331 | * %-EPERM if current process hasn't %CAP_NET_ADMIN set | |
1332 | * %-EINVAL if passed tunnel parameters are invalid, | |
1333 | * %-EEXIST if changing a tunnel's parameters would cause a conflict | |
1334 | * %-ENODEV if attempting to change or delete a nonexisting device | |
1335 | **/ | |
1336 | ||
1337 | static int | |
3144581c | 1338 | ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
1da177e4 LT |
1339 | { |
1340 | int err = 0; | |
1da177e4 | 1341 | struct ip6_tnl_parm p; |
c12b395a | 1342 | struct __ip6_tnl_parm p1; |
1da177e4 | 1343 | struct ip6_tnl *t = NULL; |
2dd02c89 PE |
1344 | struct net *net = dev_net(dev); |
1345 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1da177e4 LT |
1346 | |
1347 | switch (cmd) { | |
1348 | case SIOCGETTUNNEL: | |
15820e12 | 1349 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 | 1350 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) { |
1da177e4 LT |
1351 | err = -EFAULT; |
1352 | break; | |
1353 | } | |
c12b395a | 1354 | ip6_tnl_parm_from_user(&p1, &p); |
1355 | t = ip6_tnl_locate(net, &p1, 0); | |
5ef5d6c5 DC |
1356 | } else { |
1357 | memset(&p, 0, sizeof(p)); | |
567131a7 VN |
1358 | } |
1359 | if (t == NULL) | |
2941a486 | 1360 | t = netdev_priv(dev); |
c12b395a | 1361 | ip6_tnl_parm_to_user(&p, &t->parms); |
1da177e4 LT |
1362 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) { |
1363 | err = -EFAULT; | |
1364 | } | |
1365 | break; | |
1366 | case SIOCADDTUNNEL: | |
1367 | case SIOCCHGTUNNEL: | |
1368 | err = -EPERM; | |
af31f412 | 1369 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 1370 | break; |
567131a7 VN |
1371 | err = -EFAULT; |
1372 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1373 | break; |
567131a7 | 1374 | err = -EINVAL; |
502b0935 YK |
1375 | if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && |
1376 | p.proto != 0) | |
1da177e4 | 1377 | break; |
c12b395a | 1378 | ip6_tnl_parm_from_user(&p1, &p); |
1379 | t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL); | |
15820e12 | 1380 | if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) { |
567131a7 VN |
1381 | if (t != NULL) { |
1382 | if (t->dev != dev) { | |
1383 | err = -EEXIST; | |
1384 | break; | |
1385 | } | |
1386 | } else | |
1387 | t = netdev_priv(dev); | |
1388 | ||
0b112457 | 1389 | err = ip6_tnl_update(t, &p1); |
1da177e4 | 1390 | } |
567131a7 | 1391 | if (t) { |
1da177e4 | 1392 | err = 0; |
c12b395a | 1393 | ip6_tnl_parm_to_user(&p, &t->parms); |
1394 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
567131a7 VN |
1395 | err = -EFAULT; |
1396 | ||
1397 | } else | |
1398 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1da177e4 LT |
1399 | break; |
1400 | case SIOCDELTUNNEL: | |
1401 | err = -EPERM; | |
af31f412 | 1402 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1403 | break; |
1404 | ||
15820e12 | 1405 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 VN |
1406 | err = -EFAULT; |
1407 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1408 | break; |
567131a7 | 1409 | err = -ENOENT; |
c12b395a | 1410 | ip6_tnl_parm_from_user(&p1, &p); |
1411 | t = ip6_tnl_locate(net, &p1, 0); | |
1412 | if (t == NULL) | |
1da177e4 | 1413 | break; |
567131a7 | 1414 | err = -EPERM; |
15820e12 | 1415 | if (t->dev == ip6n->fb_tnl_dev) |
1da177e4 | 1416 | break; |
567131a7 | 1417 | dev = t->dev; |
1da177e4 | 1418 | } |
22f8cde5 SH |
1419 | err = 0; |
1420 | unregister_netdevice(dev); | |
1da177e4 LT |
1421 | break; |
1422 | default: | |
1423 | err = -EINVAL; | |
1424 | } | |
1425 | return err; | |
1426 | } | |
1427 | ||
1da177e4 | 1428 | /** |
3144581c | 1429 | * ip6_tnl_change_mtu - change mtu manually for tunnel device |
1da177e4 LT |
1430 | * @dev: virtual device associated with tunnel |
1431 | * @new_mtu: the new mtu | |
1432 | * | |
1433 | * Return: | |
1434 | * 0 on success, | |
1435 | * %-EINVAL if mtu too small | |
1436 | **/ | |
1437 | ||
1438 | static int | |
3144581c | 1439 | ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) |
1da177e4 | 1440 | { |
582442d6 OG |
1441 | struct ip6_tnl *tnl = netdev_priv(dev); |
1442 | ||
1443 | if (tnl->parms.proto == IPPROTO_IPIP) { | |
1444 | if (new_mtu < 68) | |
1445 | return -EINVAL; | |
1446 | } else { | |
1447 | if (new_mtu < IPV6_MIN_MTU) | |
1448 | return -EINVAL; | |
1da177e4 | 1449 | } |
582442d6 OG |
1450 | if (new_mtu > 0xFFF8 - dev->hard_header_len) |
1451 | return -EINVAL; | |
1da177e4 LT |
1452 | dev->mtu = new_mtu; |
1453 | return 0; | |
1454 | } | |
1455 | ||
1326c3d5 SH |
1456 | |
1457 | static const struct net_device_ops ip6_tnl_netdev_ops = { | |
8560f226 | 1458 | .ndo_uninit = ip6_tnl_dev_uninit, |
1326c3d5 | 1459 | .ndo_start_xmit = ip6_tnl_xmit, |
8560f226 | 1460 | .ndo_do_ioctl = ip6_tnl_ioctl, |
1326c3d5 | 1461 | .ndo_change_mtu = ip6_tnl_change_mtu, |
8560f226 | 1462 | .ndo_get_stats = ip6_get_stats, |
1326c3d5 SH |
1463 | }; |
1464 | ||
8560f226 | 1465 | |
1da177e4 | 1466 | /** |
3144581c | 1467 | * ip6_tnl_dev_setup - setup virtual tunnel device |
1da177e4 LT |
1468 | * @dev: virtual device associated with tunnel |
1469 | * | |
1470 | * Description: | |
1471 | * Initialize function pointers and device parameters | |
1472 | **/ | |
1473 | ||
3144581c | 1474 | static void ip6_tnl_dev_setup(struct net_device *dev) |
1da177e4 | 1475 | { |
381601e5 AF |
1476 | struct ip6_tnl *t; |
1477 | ||
1326c3d5 | 1478 | dev->netdev_ops = &ip6_tnl_netdev_ops; |
8560f226 | 1479 | dev->destructor = ip6_dev_free; |
1da177e4 LT |
1480 | |
1481 | dev->type = ARPHRD_TUNNEL6; | |
1482 | dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr); | |
1483 | dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr); | |
381601e5 AF |
1484 | t = netdev_priv(dev); |
1485 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1486 | dev->mtu-=8; | |
1da177e4 LT |
1487 | dev->flags |= IFF_NOARP; |
1488 | dev->addr_len = sizeof(struct in6_addr); | |
7e223de8 | 1489 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
e837735e ND |
1490 | /* This perm addr will be used as interface identifier by IPv6 */ |
1491 | dev->addr_assign_type = NET_ADDR_RANDOM; | |
1492 | eth_random_addr(dev->perm_addr); | |
1da177e4 LT |
1493 | } |
1494 | ||
1495 | ||
1496 | /** | |
3144581c | 1497 | * ip6_tnl_dev_init_gen - general initializer for all tunnel devices |
1da177e4 LT |
1498 | * @dev: virtual device associated with tunnel |
1499 | **/ | |
1500 | ||
8560f226 | 1501 | static inline int |
3144581c | 1502 | ip6_tnl_dev_init_gen(struct net_device *dev) |
1da177e4 | 1503 | { |
2941a486 | 1504 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 | 1505 | |
1da177e4 | 1506 | t->dev = dev; |
0bd87628 | 1507 | t->net = dev_net(dev); |
1c213bd2 | 1508 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
8560f226 ED |
1509 | if (!dev->tstats) |
1510 | return -ENOMEM; | |
1511 | return 0; | |
1da177e4 LT |
1512 | } |
1513 | ||
1514 | /** | |
3144581c | 1515 | * ip6_tnl_dev_init - initializer for all non fallback tunnel devices |
1da177e4 LT |
1516 | * @dev: virtual device associated with tunnel |
1517 | **/ | |
1518 | ||
8560f226 | 1519 | static int ip6_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1520 | { |
2941a486 | 1521 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 ED |
1522 | int err = ip6_tnl_dev_init_gen(dev); |
1523 | ||
1524 | if (err) | |
1525 | return err; | |
3144581c | 1526 | ip6_tnl_link_config(t); |
8560f226 | 1527 | return 0; |
1da177e4 LT |
1528 | } |
1529 | ||
1530 | /** | |
3144581c | 1531 | * ip6_fb_tnl_dev_init - initializer for fallback tunnel device |
1da177e4 LT |
1532 | * @dev: fallback device |
1533 | * | |
1534 | * Return: 0 | |
1535 | **/ | |
1536 | ||
8560f226 | 1537 | static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1538 | { |
2941a486 | 1539 | struct ip6_tnl *t = netdev_priv(dev); |
3e6c9fb5 PE |
1540 | struct net *net = dev_net(dev); |
1541 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
8560f226 ED |
1542 | int err = ip6_tnl_dev_init_gen(dev); |
1543 | ||
1544 | if (err) | |
1545 | return err; | |
3e6c9fb5 | 1546 | |
502b0935 | 1547 | t->parms.proto = IPPROTO_IPV6; |
1da177e4 | 1548 | dev_hold(dev); |
d0087b29 VN |
1549 | |
1550 | ip6_tnl_link_config(t); | |
1551 | ||
cf778b00 | 1552 | rcu_assign_pointer(ip6n->tnls_wc[0], t); |
8560f226 | 1553 | return 0; |
1da177e4 LT |
1554 | } |
1555 | ||
0b112457 ND |
1556 | static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[]) |
1557 | { | |
1558 | u8 proto; | |
1559 | ||
1560 | if (!data) | |
1561 | return 0; | |
1562 | ||
1563 | proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1564 | if (proto != IPPROTO_IPV6 && | |
1565 | proto != IPPROTO_IPIP && | |
1566 | proto != 0) | |
1567 | return -EINVAL; | |
1568 | ||
1569 | return 0; | |
1570 | } | |
1571 | ||
1572 | static void ip6_tnl_netlink_parms(struct nlattr *data[], | |
1573 | struct __ip6_tnl_parm *parms) | |
1574 | { | |
1575 | memset(parms, 0, sizeof(*parms)); | |
1576 | ||
1577 | if (!data) | |
1578 | return; | |
1579 | ||
1580 | if (data[IFLA_IPTUN_LINK]) | |
1581 | parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); | |
1582 | ||
1583 | if (data[IFLA_IPTUN_LOCAL]) | |
1584 | nla_memcpy(&parms->laddr, data[IFLA_IPTUN_LOCAL], | |
1585 | sizeof(struct in6_addr)); | |
1586 | ||
1587 | if (data[IFLA_IPTUN_REMOTE]) | |
1588 | nla_memcpy(&parms->raddr, data[IFLA_IPTUN_REMOTE], | |
1589 | sizeof(struct in6_addr)); | |
1590 | ||
1591 | if (data[IFLA_IPTUN_TTL]) | |
1592 | parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]); | |
1593 | ||
1594 | if (data[IFLA_IPTUN_ENCAP_LIMIT]) | |
1595 | parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]); | |
1596 | ||
1597 | if (data[IFLA_IPTUN_FLOWINFO]) | |
1ff05fb7 | 1598 | parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]); |
0b112457 ND |
1599 | |
1600 | if (data[IFLA_IPTUN_FLAGS]) | |
1601 | parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]); | |
1602 | ||
1603 | if (data[IFLA_IPTUN_PROTO]) | |
1604 | parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1605 | } | |
1606 | ||
1607 | static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev, | |
1608 | struct nlattr *tb[], struct nlattr *data[]) | |
1609 | { | |
1610 | struct net *net = dev_net(dev); | |
1611 | struct ip6_tnl *nt; | |
1612 | ||
1613 | nt = netdev_priv(dev); | |
1614 | ip6_tnl_netlink_parms(data, &nt->parms); | |
1615 | ||
1616 | if (ip6_tnl_locate(net, &nt->parms, 0)) | |
1617 | return -EEXIST; | |
1618 | ||
1619 | return ip6_tnl_create2(dev); | |
1620 | } | |
1621 | ||
1622 | static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[], | |
1623 | struct nlattr *data[]) | |
1624 | { | |
0bd87628 | 1625 | struct ip6_tnl *t = netdev_priv(dev); |
0b112457 | 1626 | struct __ip6_tnl_parm p; |
0bd87628 | 1627 | struct net *net = t->net; |
0b112457 ND |
1628 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1629 | ||
1630 | if (dev == ip6n->fb_tnl_dev) | |
1631 | return -EINVAL; | |
1632 | ||
1633 | ip6_tnl_netlink_parms(data, &p); | |
1634 | ||
1635 | t = ip6_tnl_locate(net, &p, 0); | |
1636 | ||
1637 | if (t) { | |
1638 | if (t->dev != dev) | |
1639 | return -EEXIST; | |
1640 | } else | |
1641 | t = netdev_priv(dev); | |
1642 | ||
1643 | return ip6_tnl_update(t, &p); | |
1644 | } | |
1645 | ||
1e9f3d6f ND |
1646 | static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head) |
1647 | { | |
1648 | struct net *net = dev_net(dev); | |
1649 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1650 | ||
1651 | if (dev != ip6n->fb_tnl_dev) | |
1652 | unregister_netdevice_queue(dev, head); | |
1653 | } | |
1654 | ||
b58d731a | 1655 | static size_t ip6_tnl_get_size(const struct net_device *dev) |
c075b130 ND |
1656 | { |
1657 | return | |
1658 | /* IFLA_IPTUN_LINK */ | |
1659 | nla_total_size(4) + | |
1660 | /* IFLA_IPTUN_LOCAL */ | |
1661 | nla_total_size(sizeof(struct in6_addr)) + | |
1662 | /* IFLA_IPTUN_REMOTE */ | |
1663 | nla_total_size(sizeof(struct in6_addr)) + | |
1664 | /* IFLA_IPTUN_TTL */ | |
1665 | nla_total_size(1) + | |
1666 | /* IFLA_IPTUN_ENCAP_LIMIT */ | |
1667 | nla_total_size(1) + | |
1668 | /* IFLA_IPTUN_FLOWINFO */ | |
1669 | nla_total_size(4) + | |
1670 | /* IFLA_IPTUN_FLAGS */ | |
1671 | nla_total_size(4) + | |
cfa323b6 ND |
1672 | /* IFLA_IPTUN_PROTO */ |
1673 | nla_total_size(1) + | |
c075b130 ND |
1674 | 0; |
1675 | } | |
1676 | ||
b58d731a | 1677 | static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev) |
c075b130 ND |
1678 | { |
1679 | struct ip6_tnl *tunnel = netdev_priv(dev); | |
1680 | struct __ip6_tnl_parm *parm = &tunnel->parms; | |
1681 | ||
1682 | if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || | |
1683 | nla_put(skb, IFLA_IPTUN_LOCAL, sizeof(struct in6_addr), | |
c075b130 | 1684 | &parm->laddr) || |
0d2ede92 DZ |
1685 | nla_put(skb, IFLA_IPTUN_REMOTE, sizeof(struct in6_addr), |
1686 | &parm->raddr) || | |
c075b130 ND |
1687 | nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) || |
1688 | nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) || | |
1689 | nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) || | |
cfa323b6 ND |
1690 | nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) || |
1691 | nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto)) | |
c075b130 ND |
1692 | goto nla_put_failure; |
1693 | return 0; | |
1694 | ||
1695 | nla_put_failure: | |
1696 | return -EMSGSIZE; | |
1697 | } | |
1698 | ||
0b112457 ND |
1699 | static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = { |
1700 | [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, | |
1701 | [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) }, | |
1702 | [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) }, | |
1703 | [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, | |
1704 | [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 }, | |
1705 | [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 }, | |
1706 | [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 }, | |
1707 | [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, | |
1708 | }; | |
1709 | ||
c075b130 ND |
1710 | static struct rtnl_link_ops ip6_link_ops __read_mostly = { |
1711 | .kind = "ip6tnl", | |
1712 | .maxtype = IFLA_IPTUN_MAX, | |
0b112457 | 1713 | .policy = ip6_tnl_policy, |
c075b130 | 1714 | .priv_size = sizeof(struct ip6_tnl), |
0b112457 ND |
1715 | .setup = ip6_tnl_dev_setup, |
1716 | .validate = ip6_tnl_validate, | |
1717 | .newlink = ip6_tnl_newlink, | |
1718 | .changelink = ip6_tnl_changelink, | |
1e9f3d6f | 1719 | .dellink = ip6_tnl_dellink, |
b58d731a ND |
1720 | .get_size = ip6_tnl_get_size, |
1721 | .fill_info = ip6_tnl_fill_info, | |
c075b130 ND |
1722 | }; |
1723 | ||
3ff2cfa5 | 1724 | static struct xfrm6_tunnel ip4ip6_handler __read_mostly = { |
c4d3efaf YK |
1725 | .handler = ip4ip6_rcv, |
1726 | .err_handler = ip4ip6_err, | |
1727 | .priority = 1, | |
1728 | }; | |
1729 | ||
3ff2cfa5 | 1730 | static struct xfrm6_tunnel ip6ip6_handler __read_mostly = { |
0303770d PM |
1731 | .handler = ip6ip6_rcv, |
1732 | .err_handler = ip6ip6_err, | |
d2acc347 | 1733 | .priority = 1, |
1da177e4 LT |
1734 | }; |
1735 | ||
1e9f3d6f | 1736 | static void __net_exit ip6_tnl_destroy_tunnels(struct net *net) |
3e6c9fb5 | 1737 | { |
1e9f3d6f | 1738 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
0bd87628 | 1739 | struct net_device *dev, *aux; |
3e6c9fb5 PE |
1740 | int h; |
1741 | struct ip6_tnl *t; | |
cf4432f5 | 1742 | LIST_HEAD(list); |
3e6c9fb5 | 1743 | |
0bd87628 ND |
1744 | for_each_netdev_safe(net, dev, aux) |
1745 | if (dev->rtnl_link_ops == &ip6_link_ops) | |
1746 | unregister_netdevice_queue(dev, &list); | |
1747 | ||
3e6c9fb5 | 1748 | for (h = 0; h < HASH_SIZE; h++) { |
94767632 | 1749 | t = rtnl_dereference(ip6n->tnls_r_l[h]); |
cf4432f5 | 1750 | while (t != NULL) { |
0bd87628 ND |
1751 | /* If dev is in the same netns, it has already |
1752 | * been added to the list by the previous loop. | |
1753 | */ | |
1754 | if (!net_eq(dev_net(t->dev), net)) | |
1755 | unregister_netdevice_queue(t->dev, &list); | |
94767632 | 1756 | t = rtnl_dereference(t->next); |
cf4432f5 | 1757 | } |
3e6c9fb5 PE |
1758 | } |
1759 | ||
cf4432f5 | 1760 | unregister_netdevice_many(&list); |
3e6c9fb5 PE |
1761 | } |
1762 | ||
2c8c1e72 | 1763 | static int __net_init ip6_tnl_init_net(struct net *net) |
13eeb8e9 | 1764 | { |
ac31cd3c | 1765 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
731abb9c | 1766 | struct ip6_tnl *t = NULL; |
13eeb8e9 | 1767 | int err; |
13eeb8e9 | 1768 | |
3e6c9fb5 PE |
1769 | ip6n->tnls[0] = ip6n->tnls_wc; |
1770 | ip6n->tnls[1] = ip6n->tnls_r_l; | |
1771 | ||
15820e12 PE |
1772 | err = -ENOMEM; |
1773 | ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", | |
1774 | ip6_tnl_dev_setup); | |
1775 | ||
1776 | if (!ip6n->fb_tnl_dev) | |
1777 | goto err_alloc_dev; | |
be77e593 | 1778 | dev_net_set(ip6n->fb_tnl_dev, net); |
bb814094 | 1779 | ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops; |
0bd87628 ND |
1780 | /* FB netdevice is special: we have one, and only one per netns. |
1781 | * Allowing to move it to another netns is clearly unsafe. | |
1782 | */ | |
1783 | ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL; | |
15820e12 | 1784 | |
8560f226 ED |
1785 | err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); |
1786 | if (err < 0) | |
1787 | goto err_register; | |
15820e12 PE |
1788 | |
1789 | err = register_netdev(ip6n->fb_tnl_dev); | |
1790 | if (err < 0) | |
1791 | goto err_register; | |
731abb9c JB |
1792 | |
1793 | t = netdev_priv(ip6n->fb_tnl_dev); | |
1794 | ||
1795 | strcpy(t->parms.name, ip6n->fb_tnl_dev->name); | |
13eeb8e9 PE |
1796 | return 0; |
1797 | ||
15820e12 | 1798 | err_register: |
8560f226 | 1799 | ip6_dev_free(ip6n->fb_tnl_dev); |
15820e12 | 1800 | err_alloc_dev: |
13eeb8e9 PE |
1801 | return err; |
1802 | } | |
1803 | ||
2c8c1e72 | 1804 | static void __net_exit ip6_tnl_exit_net(struct net *net) |
13eeb8e9 | 1805 | { |
3e6c9fb5 | 1806 | rtnl_lock(); |
1e9f3d6f | 1807 | ip6_tnl_destroy_tunnels(net); |
3e6c9fb5 | 1808 | rtnl_unlock(); |
13eeb8e9 PE |
1809 | } |
1810 | ||
1811 | static struct pernet_operations ip6_tnl_net_ops = { | |
1812 | .init = ip6_tnl_init_net, | |
1813 | .exit = ip6_tnl_exit_net, | |
ac31cd3c EB |
1814 | .id = &ip6_tnl_net_id, |
1815 | .size = sizeof(struct ip6_tnl_net), | |
13eeb8e9 PE |
1816 | }; |
1817 | ||
1da177e4 LT |
1818 | /** |
1819 | * ip6_tunnel_init - register protocol and reserve needed resources | |
1820 | * | |
1821 | * Return: 0 on success | |
1822 | **/ | |
1823 | ||
1824 | static int __init ip6_tunnel_init(void) | |
1825 | { | |
1826 | int err; | |
1827 | ||
d5aa407f AD |
1828 | err = register_pernet_device(&ip6_tnl_net_ops); |
1829 | if (err < 0) | |
1830 | goto out_pernet; | |
1831 | ||
1832 | err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET); | |
1833 | if (err < 0) { | |
f3213831 | 1834 | pr_err("%s: can't register ip4ip6\n", __func__); |
d5aa407f | 1835 | goto out_ip4ip6; |
c4d3efaf YK |
1836 | } |
1837 | ||
d5aa407f AD |
1838 | err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6); |
1839 | if (err < 0) { | |
f3213831 | 1840 | pr_err("%s: can't register ip6ip6\n", __func__); |
d5aa407f | 1841 | goto out_ip6ip6; |
1da177e4 | 1842 | } |
c075b130 ND |
1843 | err = rtnl_link_register(&ip6_link_ops); |
1844 | if (err < 0) | |
1845 | goto rtnl_link_failed; | |
13eeb8e9 | 1846 | |
1da177e4 | 1847 | return 0; |
d5aa407f | 1848 | |
c075b130 ND |
1849 | rtnl_link_failed: |
1850 | xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6); | |
d5aa407f | 1851 | out_ip6ip6: |
c4d3efaf | 1852 | xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); |
d5aa407f AD |
1853 | out_ip4ip6: |
1854 | unregister_pernet_device(&ip6_tnl_net_ops); | |
1855 | out_pernet: | |
1da177e4 LT |
1856 | return err; |
1857 | } | |
1858 | ||
1859 | /** | |
1860 | * ip6_tunnel_cleanup - free resources and unregister protocol | |
1861 | **/ | |
1862 | ||
1863 | static void __exit ip6_tunnel_cleanup(void) | |
1864 | { | |
c075b130 | 1865 | rtnl_link_unregister(&ip6_link_ops); |
c4d3efaf | 1866 | if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) |
f3213831 | 1867 | pr_info("%s: can't deregister ip4ip6\n", __func__); |
c4d3efaf | 1868 | |
73d605d1 | 1869 | if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) |
f3213831 | 1870 | pr_info("%s: can't deregister ip6ip6\n", __func__); |
1da177e4 | 1871 | |
ac31cd3c | 1872 | unregister_pernet_device(&ip6_tnl_net_ops); |
1da177e4 LT |
1873 | } |
1874 | ||
1875 | module_init(ip6_tunnel_init); | |
1876 | module_exit(ip6_tunnel_cleanup); |