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"); |
f98f89a0 | 64 | MODULE_ALIAS_RTNL_LINK("ip6tnl"); |
6dfbd87a | 65 | MODULE_ALIAS_NETDEV("ip6tnl0"); |
1da177e4 | 66 | |
ddbe5032 ED |
67 | #define HASH_SIZE_SHIFT 5 |
68 | #define HASH_SIZE (1 << HASH_SIZE_SHIFT) | |
1da177e4 | 69 | |
f4e0b4c5 ND |
70 | static bool log_ecn_error = true; |
71 | module_param(log_ecn_error, bool, 0644); | |
72 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); | |
73 | ||
ddbe5032 ED |
74 | static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2) |
75 | { | |
76 | u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2); | |
77 | ||
78 | return hash_32(hash, HASH_SIZE_SHIFT); | |
79 | } | |
1da177e4 | 80 | |
8560f226 | 81 | static int ip6_tnl_dev_init(struct net_device *dev); |
3144581c | 82 | static void ip6_tnl_dev_setup(struct net_device *dev); |
c075b130 | 83 | static struct rtnl_link_ops ip6_link_ops __read_mostly; |
1da177e4 | 84 | |
f99189b1 | 85 | static int ip6_tnl_net_id __read_mostly; |
13eeb8e9 | 86 | struct ip6_tnl_net { |
15820e12 PE |
87 | /* the IPv6 tunnel fallback device */ |
88 | struct net_device *fb_tnl_dev; | |
3e6c9fb5 | 89 | /* lists for storing tunnels in use */ |
94767632 ED |
90 | struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE]; |
91 | struct ip6_tnl __rcu *tnls_wc[1]; | |
92 | struct ip6_tnl __rcu **tnls[2]; | |
13eeb8e9 PE |
93 | }; |
94 | ||
8560f226 ED |
95 | static struct net_device_stats *ip6_get_stats(struct net_device *dev) |
96 | { | |
56a4342d | 97 | struct pcpu_sw_netstats tmp, sum = { 0 }; |
8560f226 ED |
98 | int i; |
99 | ||
100 | for_each_possible_cpu(i) { | |
abb6013c | 101 | unsigned int start; |
8f84985f LR |
102 | const struct pcpu_sw_netstats *tstats = |
103 | per_cpu_ptr(dev->tstats, i); | |
8560f226 | 104 | |
abb6013c | 105 | do { |
57a7744e | 106 | start = u64_stats_fetch_begin_irq(&tstats->syncp); |
abb6013c LR |
107 | tmp.rx_packets = tstats->rx_packets; |
108 | tmp.rx_bytes = tstats->rx_bytes; | |
109 | tmp.tx_packets = tstats->tx_packets; | |
110 | tmp.tx_bytes = tstats->tx_bytes; | |
57a7744e | 111 | } while (u64_stats_fetch_retry_irq(&tstats->syncp, start)); |
abb6013c LR |
112 | |
113 | sum.rx_packets += tmp.rx_packets; | |
114 | sum.rx_bytes += tmp.rx_bytes; | |
115 | sum.tx_packets += tmp.tx_packets; | |
116 | sum.tx_bytes += tmp.tx_bytes; | |
8560f226 ED |
117 | } |
118 | dev->stats.rx_packets = sum.rx_packets; | |
119 | dev->stats.rx_bytes = sum.rx_bytes; | |
120 | dev->stats.tx_packets = sum.tx_packets; | |
121 | dev->stats.tx_bytes = sum.tx_bytes; | |
122 | return &dev->stats; | |
123 | } | |
124 | ||
2922bc8a | 125 | /* |
94767632 | 126 | * Locking : hash tables are protected by RCU and RTNL |
2922bc8a | 127 | */ |
1da177e4 | 128 | |
c12b395a | 129 | struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t) |
1da177e4 LT |
130 | { |
131 | struct dst_entry *dst = t->dst_cache; | |
132 | ||
1ab1457c | 133 | if (dst && dst->obsolete && |
63159f29 | 134 | !dst->ops->check(dst, t->dst_cookie)) { |
1da177e4 LT |
135 | t->dst_cache = NULL; |
136 | dst_release(dst); | |
137 | return NULL; | |
138 | } | |
139 | ||
140 | return dst; | |
141 | } | |
c12b395a | 142 | EXPORT_SYMBOL_GPL(ip6_tnl_dst_check); |
1da177e4 | 143 | |
c12b395a | 144 | void ip6_tnl_dst_reset(struct ip6_tnl *t) |
1da177e4 LT |
145 | { |
146 | dst_release(t->dst_cache); | |
147 | t->dst_cache = NULL; | |
148 | } | |
c12b395a | 149 | EXPORT_SYMBOL_GPL(ip6_tnl_dst_reset); |
1da177e4 | 150 | |
c12b395a | 151 | void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst) |
1da177e4 LT |
152 | { |
153 | struct rt6_info *rt = (struct rt6_info *) dst; | |
b197df4f | 154 | t->dst_cookie = rt6_get_cookie(rt); |
1da177e4 LT |
155 | dst_release(t->dst_cache); |
156 | t->dst_cache = dst; | |
157 | } | |
c12b395a | 158 | EXPORT_SYMBOL_GPL(ip6_tnl_dst_store); |
1da177e4 LT |
159 | |
160 | /** | |
3144581c | 161 | * ip6_tnl_lookup - fetch tunnel matching the end-point addresses |
1ab1457c YH |
162 | * @remote: the address of the tunnel exit-point |
163 | * @local: the address of the tunnel entry-point | |
1da177e4 | 164 | * |
1ab1457c | 165 | * Return: |
1da177e4 | 166 | * tunnel matching given end-points if found, |
1ab1457c | 167 | * else fallback tunnel if its device is up, |
1da177e4 LT |
168 | * else %NULL |
169 | **/ | |
170 | ||
2922bc8a ED |
171 | #define for_each_ip6_tunnel_rcu(start) \ |
172 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) | |
173 | ||
1da177e4 | 174 | static struct ip6_tnl * |
b71d1d42 | 175 | ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local) |
1da177e4 | 176 | { |
ddbe5032 | 177 | unsigned int hash = HASH(remote, local); |
1da177e4 | 178 | struct ip6_tnl *t; |
3e6c9fb5 | 179 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
ea3dc960 | 180 | struct in6_addr any; |
1da177e4 | 181 | |
ddbe5032 | 182 | for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { |
1da177e4 LT |
183 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
184 | ipv6_addr_equal(remote, &t->parms.raddr) && | |
185 | (t->dev->flags & IFF_UP)) | |
186 | return t; | |
187 | } | |
ea3dc960 SK |
188 | |
189 | memset(&any, 0, sizeof(any)); | |
190 | hash = HASH(&any, local); | |
191 | for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { | |
192 | if (ipv6_addr_equal(local, &t->parms.laddr) && | |
193 | (t->dev->flags & IFF_UP)) | |
194 | return t; | |
195 | } | |
196 | ||
197 | hash = HASH(remote, &any); | |
198 | for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { | |
199 | if (ipv6_addr_equal(remote, &t->parms.raddr) && | |
200 | (t->dev->flags & IFF_UP)) | |
201 | return t; | |
202 | } | |
203 | ||
2922bc8a ED |
204 | t = rcu_dereference(ip6n->tnls_wc[0]); |
205 | if (t && (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
206 | return t; |
207 | ||
208 | return NULL; | |
209 | } | |
210 | ||
211 | /** | |
3144581c | 212 | * ip6_tnl_bucket - get head of list matching given tunnel parameters |
1ab1457c | 213 | * @p: parameters containing tunnel end-points |
1da177e4 LT |
214 | * |
215 | * Description: | |
3144581c | 216 | * ip6_tnl_bucket() returns the head of the list matching the |
1da177e4 LT |
217 | * &struct in6_addr entries laddr and raddr in @p. |
218 | * | |
1ab1457c | 219 | * Return: head of IPv6 tunnel list |
1da177e4 LT |
220 | **/ |
221 | ||
94767632 | 222 | static struct ip6_tnl __rcu ** |
c12b395a | 223 | ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p) |
1da177e4 | 224 | { |
b71d1d42 ED |
225 | const struct in6_addr *remote = &p->raddr; |
226 | const struct in6_addr *local = &p->laddr; | |
95c96174 | 227 | unsigned int h = 0; |
1da177e4 LT |
228 | int prio = 0; |
229 | ||
230 | if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { | |
231 | prio = 1; | |
ddbe5032 | 232 | h = HASH(remote, local); |
1da177e4 | 233 | } |
3e6c9fb5 | 234 | return &ip6n->tnls[prio][h]; |
1da177e4 LT |
235 | } |
236 | ||
237 | /** | |
3144581c | 238 | * ip6_tnl_link - add tunnel to hash table |
1da177e4 LT |
239 | * @t: tunnel to be added |
240 | **/ | |
241 | ||
242 | static void | |
2dd02c89 | 243 | ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 244 | { |
94767632 | 245 | struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms); |
1da177e4 | 246 | |
cf778b00 ED |
247 | rcu_assign_pointer(t->next , rtnl_dereference(*tp)); |
248 | rcu_assign_pointer(*tp, t); | |
1da177e4 LT |
249 | } |
250 | ||
251 | /** | |
3144581c | 252 | * ip6_tnl_unlink - remove tunnel from hash table |
1da177e4 LT |
253 | * @t: tunnel to be removed |
254 | **/ | |
255 | ||
256 | static void | |
2dd02c89 | 257 | ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 258 | { |
94767632 ED |
259 | struct ip6_tnl __rcu **tp; |
260 | struct ip6_tnl *iter; | |
261 | ||
262 | for (tp = ip6_tnl_bucket(ip6n, &t->parms); | |
263 | (iter = rtnl_dereference(*tp)) != NULL; | |
264 | tp = &iter->next) { | |
265 | if (t == iter) { | |
cf778b00 | 266 | rcu_assign_pointer(*tp, t->next); |
1da177e4 LT |
267 | break; |
268 | } | |
269 | } | |
270 | } | |
271 | ||
8560f226 ED |
272 | static void ip6_dev_free(struct net_device *dev) |
273 | { | |
274 | free_percpu(dev->tstats); | |
275 | free_netdev(dev); | |
276 | } | |
277 | ||
0b112457 ND |
278 | static int ip6_tnl_create2(struct net_device *dev) |
279 | { | |
280 | struct ip6_tnl *t = netdev_priv(dev); | |
281 | struct net *net = dev_net(dev); | |
282 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
283 | int err; | |
284 | ||
285 | t = netdev_priv(dev); | |
0b112457 ND |
286 | |
287 | err = register_netdevice(dev); | |
288 | if (err < 0) | |
289 | goto out; | |
290 | ||
291 | strcpy(t->parms.name, dev->name); | |
292 | dev->rtnl_link_ops = &ip6_link_ops; | |
293 | ||
294 | dev_hold(dev); | |
295 | ip6_tnl_link(ip6n, t); | |
296 | return 0; | |
297 | ||
298 | out: | |
299 | return err; | |
300 | } | |
301 | ||
1da177e4 | 302 | /** |
2c53040f | 303 | * ip6_tnl_create - create a new tunnel |
1da177e4 LT |
304 | * @p: tunnel parameters |
305 | * @pt: pointer to new tunnel | |
306 | * | |
307 | * Description: | |
308 | * Create tunnel matching given parameters. | |
1ab1457c YH |
309 | * |
310 | * Return: | |
37355565 | 311 | * created tunnel or error pointer |
1da177e4 LT |
312 | **/ |
313 | ||
c12b395a | 314 | static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p) |
1da177e4 LT |
315 | { |
316 | struct net_device *dev; | |
317 | struct ip6_tnl *t; | |
318 | char name[IFNAMSIZ]; | |
37355565 | 319 | int err = -ENOMEM; |
1da177e4 | 320 | |
34cc7ba6 | 321 | if (p->name[0]) |
1da177e4 | 322 | strlcpy(name, p->name, IFNAMSIZ); |
34cc7ba6 PE |
323 | else |
324 | sprintf(name, "ip6tnl%%d"); | |
325 | ||
c835a677 TG |
326 | dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, |
327 | ip6_tnl_dev_setup); | |
63159f29 | 328 | if (!dev) |
567131a7 | 329 | goto failed; |
1da177e4 | 330 | |
554eb277 PE |
331 | dev_net_set(dev, net); |
332 | ||
2941a486 | 333 | t = netdev_priv(dev); |
1da177e4 | 334 | t->parms = *p; |
0bd87628 | 335 | t->net = dev_net(dev); |
0b112457 | 336 | err = ip6_tnl_create2(dev); |
8560f226 ED |
337 | if (err < 0) |
338 | goto failed_free; | |
1da177e4 | 339 | |
567131a7 | 340 | return t; |
b37d428b PE |
341 | |
342 | failed_free: | |
8560f226 | 343 | ip6_dev_free(dev); |
567131a7 | 344 | failed: |
37355565 | 345 | return ERR_PTR(err); |
1da177e4 LT |
346 | } |
347 | ||
348 | /** | |
3144581c | 349 | * ip6_tnl_locate - find or create tunnel matching given parameters |
1ab1457c | 350 | * @p: tunnel parameters |
1da177e4 LT |
351 | * @create: != 0 if allowed to create new tunnel if no match found |
352 | * | |
353 | * Description: | |
3144581c | 354 | * ip6_tnl_locate() first tries to locate an existing tunnel |
1da177e4 LT |
355 | * based on @parms. If this is unsuccessful, but @create is set a new |
356 | * tunnel device is created and registered for use. | |
357 | * | |
358 | * Return: | |
37355565 | 359 | * matching tunnel or error pointer |
1da177e4 LT |
360 | **/ |
361 | ||
2dd02c89 | 362 | static struct ip6_tnl *ip6_tnl_locate(struct net *net, |
c12b395a | 363 | struct __ip6_tnl_parm *p, int create) |
1da177e4 | 364 | { |
b71d1d42 ED |
365 | const struct in6_addr *remote = &p->raddr; |
366 | const struct in6_addr *local = &p->laddr; | |
94767632 | 367 | struct ip6_tnl __rcu **tp; |
1da177e4 | 368 | struct ip6_tnl *t; |
2dd02c89 | 369 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 370 | |
94767632 ED |
371 | for (tp = ip6_tnl_bucket(ip6n, p); |
372 | (t = rtnl_dereference(*tp)) != NULL; | |
373 | tp = &t->next) { | |
1da177e4 | 374 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
2b0bb01b SK |
375 | ipv6_addr_equal(remote, &t->parms.raddr)) { |
376 | if (create) | |
37355565 | 377 | return ERR_PTR(-EEXIST); |
2b0bb01b | 378 | |
567131a7 | 379 | return t; |
2b0bb01b | 380 | } |
1da177e4 LT |
381 | } |
382 | if (!create) | |
37355565 | 383 | return ERR_PTR(-ENODEV); |
2dd02c89 | 384 | return ip6_tnl_create(net, p); |
1da177e4 LT |
385 | } |
386 | ||
387 | /** | |
3144581c | 388 | * ip6_tnl_dev_uninit - tunnel device uninitializer |
1da177e4 | 389 | * @dev: the device to be destroyed |
1ab1457c | 390 | * |
1da177e4 | 391 | * Description: |
3144581c | 392 | * ip6_tnl_dev_uninit() removes tunnel from its list |
1da177e4 LT |
393 | **/ |
394 | ||
395 | static void | |
3144581c | 396 | ip6_tnl_dev_uninit(struct net_device *dev) |
1da177e4 | 397 | { |
2941a486 | 398 | struct ip6_tnl *t = netdev_priv(dev); |
0bd87628 | 399 | struct net *net = t->net; |
2dd02c89 | 400 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 401 | |
94767632 | 402 | if (dev == ip6n->fb_tnl_dev) |
a9b3cd7f | 403 | RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL); |
94767632 | 404 | else |
2dd02c89 | 405 | ip6_tnl_unlink(ip6n, t); |
1da177e4 LT |
406 | ip6_tnl_dst_reset(t); |
407 | dev_put(dev); | |
408 | } | |
409 | ||
410 | /** | |
411 | * parse_tvl_tnl_enc_lim - handle encapsulation limit option | |
412 | * @skb: received socket buffer | |
413 | * | |
1ab1457c YH |
414 | * Return: |
415 | * 0 if none was found, | |
1da177e4 LT |
416 | * else index to encapsulation limit |
417 | **/ | |
418 | ||
c12b395a | 419 | __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw) |
1da177e4 | 420 | { |
b71d1d42 | 421 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw; |
1da177e4 | 422 | __u8 nexthdr = ipv6h->nexthdr; |
67ba4152 | 423 | __u16 off = sizeof(*ipv6h); |
1da177e4 LT |
424 | |
425 | while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { | |
426 | __u16 optlen = 0; | |
427 | struct ipv6_opt_hdr *hdr; | |
67ba4152 | 428 | if (raw + off + sizeof(*hdr) > skb->data && |
1da177e4 LT |
429 | !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr))) |
430 | break; | |
431 | ||
432 | hdr = (struct ipv6_opt_hdr *) (raw + off); | |
433 | if (nexthdr == NEXTHDR_FRAGMENT) { | |
434 | struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; | |
435 | if (frag_hdr->frag_off) | |
436 | break; | |
437 | optlen = 8; | |
438 | } else if (nexthdr == NEXTHDR_AUTH) { | |
439 | optlen = (hdr->hdrlen + 2) << 2; | |
440 | } else { | |
441 | optlen = ipv6_optlen(hdr); | |
442 | } | |
443 | if (nexthdr == NEXTHDR_DEST) { | |
444 | __u16 i = off + 2; | |
445 | while (1) { | |
446 | struct ipv6_tlv_tnl_enc_lim *tel; | |
447 | ||
448 | /* No more room for encapsulation limit */ | |
449 | if (i + sizeof (*tel) > off + optlen) | |
450 | break; | |
451 | ||
452 | tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i]; | |
453 | /* return index of option if found and valid */ | |
454 | if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && | |
455 | tel->length == 1) | |
456 | return i; | |
457 | /* else jump to next option */ | |
458 | if (tel->type) | |
459 | i += tel->length + 2; | |
460 | else | |
461 | i++; | |
462 | } | |
463 | } | |
464 | nexthdr = hdr->nexthdr; | |
465 | off += optlen; | |
466 | } | |
467 | return 0; | |
468 | } | |
c12b395a | 469 | EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim); |
1da177e4 LT |
470 | |
471 | /** | |
e490d1d8 | 472 | * ip6_tnl_err - tunnel error handler |
1da177e4 LT |
473 | * |
474 | * Description: | |
e490d1d8 | 475 | * ip6_tnl_err() should handle errors in the tunnel according |
1da177e4 LT |
476 | * to the specifications in RFC 2473. |
477 | **/ | |
478 | ||
d2acc347 | 479 | static int |
502b0935 | 480 | ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, |
d5fdd6ba | 481 | u8 *type, u8 *code, int *msg, __u32 *info, int offset) |
1da177e4 | 482 | { |
b71d1d42 | 483 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data; |
1da177e4 LT |
484 | struct ip6_tnl *t; |
485 | int rel_msg = 0; | |
d5fdd6ba BH |
486 | u8 rel_type = ICMPV6_DEST_UNREACH; |
487 | u8 rel_code = ICMPV6_ADDR_UNREACH; | |
acf722f7 | 488 | u8 tproto; |
1da177e4 LT |
489 | __u32 rel_info = 0; |
490 | __u16 len; | |
d2acc347 | 491 | int err = -ENOENT; |
1da177e4 | 492 | |
1ab1457c YH |
493 | /* If the packet doesn't contain the original IPv6 header we are |
494 | in trouble since we might need the source address for further | |
1da177e4 LT |
495 | processing of the error. */ |
496 | ||
2922bc8a | 497 | rcu_read_lock(); |
e5d08d71 | 498 | t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, &ipv6h->saddr); |
63159f29 | 499 | if (!t) |
1da177e4 LT |
500 | goto out; |
501 | ||
acf722f7 AA |
502 | tproto = ACCESS_ONCE(t->parms.proto); |
503 | if (tproto != ipproto && tproto != 0) | |
502b0935 YK |
504 | goto out; |
505 | ||
d2acc347 HX |
506 | err = 0; |
507 | ||
e490d1d8 | 508 | switch (*type) { |
1da177e4 LT |
509 | __u32 teli; |
510 | struct ipv6_tlv_tnl_enc_lim *tel; | |
511 | __u32 mtu; | |
512 | case ICMPV6_DEST_UNREACH: | |
e87cc472 JP |
513 | net_warn_ratelimited("%s: Path to destination invalid or inactive!\n", |
514 | t->parms.name); | |
1da177e4 LT |
515 | rel_msg = 1; |
516 | break; | |
517 | case ICMPV6_TIME_EXCEED: | |
e490d1d8 | 518 | if ((*code) == ICMPV6_EXC_HOPLIMIT) { |
e87cc472 JP |
519 | net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", |
520 | t->parms.name); | |
1da177e4 LT |
521 | rel_msg = 1; |
522 | } | |
523 | break; | |
524 | case ICMPV6_PARAMPROB: | |
107a5fe6 | 525 | teli = 0; |
e490d1d8 | 526 | if ((*code) == ICMPV6_HDR_FIELD) |
c12b395a | 527 | teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); |
1da177e4 | 528 | |
704eae1f | 529 | if (teli && teli == *info - 2) { |
1da177e4 LT |
530 | tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; |
531 | if (tel->encap_limit == 0) { | |
e87cc472 JP |
532 | net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", |
533 | t->parms.name); | |
1da177e4 LT |
534 | rel_msg = 1; |
535 | } | |
e87cc472 JP |
536 | } else { |
537 | net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n", | |
538 | t->parms.name); | |
1da177e4 LT |
539 | } |
540 | break; | |
541 | case ICMPV6_PKT_TOOBIG: | |
704eae1f | 542 | mtu = *info - offset; |
1da177e4 LT |
543 | if (mtu < IPV6_MIN_MTU) |
544 | mtu = IPV6_MIN_MTU; | |
545 | t->dev->mtu = mtu; | |
546 | ||
e5d08d71 IM |
547 | len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len); |
548 | if (len > mtu) { | |
1da177e4 LT |
549 | rel_type = ICMPV6_PKT_TOOBIG; |
550 | rel_code = 0; | |
551 | rel_info = mtu; | |
552 | rel_msg = 1; | |
553 | } | |
554 | break; | |
555 | } | |
e490d1d8 YK |
556 | |
557 | *type = rel_type; | |
558 | *code = rel_code; | |
559 | *info = rel_info; | |
560 | *msg = rel_msg; | |
561 | ||
562 | out: | |
2922bc8a | 563 | rcu_read_unlock(); |
e490d1d8 YK |
564 | return err; |
565 | } | |
566 | ||
c4d3efaf YK |
567 | static int |
568 | ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 569 | u8 type, u8 code, int offset, __be32 info) |
c4d3efaf YK |
570 | { |
571 | int rel_msg = 0; | |
d5fdd6ba BH |
572 | u8 rel_type = type; |
573 | u8 rel_code = code; | |
704eae1f | 574 | __u32 rel_info = ntohl(info); |
c4d3efaf YK |
575 | int err; |
576 | struct sk_buff *skb2; | |
b71d1d42 | 577 | const struct iphdr *eiph; |
c4d3efaf | 578 | struct rtable *rt; |
31e4543d | 579 | struct flowi4 fl4; |
c4d3efaf | 580 | |
502b0935 YK |
581 | err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, |
582 | &rel_msg, &rel_info, offset); | |
c4d3efaf YK |
583 | if (err < 0) |
584 | return err; | |
585 | ||
586 | if (rel_msg == 0) | |
587 | return 0; | |
588 | ||
589 | switch (rel_type) { | |
590 | case ICMPV6_DEST_UNREACH: | |
591 | if (rel_code != ICMPV6_ADDR_UNREACH) | |
592 | return 0; | |
593 | rel_type = ICMP_DEST_UNREACH; | |
594 | rel_code = ICMP_HOST_UNREACH; | |
595 | break; | |
596 | case ICMPV6_PKT_TOOBIG: | |
597 | if (rel_code != 0) | |
598 | return 0; | |
599 | rel_type = ICMP_DEST_UNREACH; | |
600 | rel_code = ICMP_FRAG_NEEDED; | |
601 | break; | |
ec18d9a2 DM |
602 | case NDISC_REDIRECT: |
603 | rel_type = ICMP_REDIRECT; | |
604 | rel_code = ICMP_REDIR_HOST; | |
c4d3efaf YK |
605 | default: |
606 | return 0; | |
607 | } | |
608 | ||
609 | if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) | |
610 | return 0; | |
611 | ||
612 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
613 | if (!skb2) | |
614 | return 0; | |
615 | ||
adf30907 ED |
616 | skb_dst_drop(skb2); |
617 | ||
c4d3efaf | 618 | skb_pull(skb2, offset); |
c1d2bbe1 | 619 | skb_reset_network_header(skb2); |
eddc9ec5 | 620 | eiph = ip_hdr(skb2); |
c4d3efaf YK |
621 | |
622 | /* Try to guess incoming interface */ | |
31e4543d | 623 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, |
78fbfd8a DM |
624 | eiph->saddr, 0, |
625 | 0, 0, | |
626 | IPPROTO_IPIP, RT_TOS(eiph->tos), 0); | |
b23dd4fe | 627 | if (IS_ERR(rt)) |
c4d3efaf YK |
628 | goto out; |
629 | ||
d8d1f30b | 630 | skb2->dev = rt->dst.dev; |
c4d3efaf YK |
631 | |
632 | /* route "incoming" packet */ | |
633 | if (rt->rt_flags & RTCF_LOCAL) { | |
634 | ip_rt_put(rt); | |
635 | rt = NULL; | |
31e4543d | 636 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, |
78fbfd8a DM |
637 | eiph->daddr, eiph->saddr, |
638 | 0, 0, | |
639 | IPPROTO_IPIP, | |
640 | RT_TOS(eiph->tos), 0); | |
b23dd4fe | 641 | if (IS_ERR(rt) || |
d8d1f30b | 642 | rt->dst.dev->type != ARPHRD_TUNNEL) { |
b23dd4fe DM |
643 | if (!IS_ERR(rt)) |
644 | ip_rt_put(rt); | |
c4d3efaf YK |
645 | goto out; |
646 | } | |
b23dd4fe | 647 | skb_dst_set(skb2, &rt->dst); |
c4d3efaf YK |
648 | } else { |
649 | ip_rt_put(rt); | |
650 | if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, | |
651 | skb2->dev) || | |
adf30907 | 652 | skb_dst(skb2)->dev->type != ARPHRD_TUNNEL) |
c4d3efaf YK |
653 | goto out; |
654 | } | |
655 | ||
656 | /* change mtu on this route */ | |
657 | if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { | |
adf30907 | 658 | if (rel_info > dst_mtu(skb_dst(skb2))) |
c4d3efaf YK |
659 | goto out; |
660 | ||
6700c270 | 661 | skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2, rel_info); |
c4d3efaf | 662 | } |
1ed5c48f | 663 | if (rel_type == ICMP_REDIRECT) |
6700c270 | 664 | skb_dst(skb2)->ops->redirect(skb_dst(skb2), NULL, skb2); |
c4d3efaf | 665 | |
704eae1f | 666 | icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); |
c4d3efaf YK |
667 | |
668 | out: | |
669 | kfree_skb(skb2); | |
670 | return 0; | |
671 | } | |
672 | ||
e490d1d8 YK |
673 | static int |
674 | ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 675 | u8 type, u8 code, int offset, __be32 info) |
e490d1d8 YK |
676 | { |
677 | int rel_msg = 0; | |
d5fdd6ba BH |
678 | u8 rel_type = type; |
679 | u8 rel_code = code; | |
704eae1f | 680 | __u32 rel_info = ntohl(info); |
e490d1d8 YK |
681 | int err; |
682 | ||
502b0935 YK |
683 | err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, |
684 | &rel_msg, &rel_info, offset); | |
e490d1d8 YK |
685 | if (err < 0) |
686 | return err; | |
687 | ||
688 | if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { | |
1da177e4 LT |
689 | struct rt6_info *rt; |
690 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
305d4b3c | 691 | |
1da177e4 | 692 | if (!skb2) |
e490d1d8 | 693 | return 0; |
1da177e4 | 694 | |
adf30907 | 695 | skb_dst_drop(skb2); |
1da177e4 | 696 | skb_pull(skb2, offset); |
c1d2bbe1 | 697 | skb_reset_network_header(skb2); |
1da177e4 LT |
698 | |
699 | /* Try to guess incoming interface */ | |
2f7f54b7 PE |
700 | rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, |
701 | NULL, 0, 0); | |
1da177e4 | 702 | |
d1918542 DM |
703 | if (rt && rt->dst.dev) |
704 | skb2->dev = rt->dst.dev; | |
1da177e4 | 705 | |
3ffe533c | 706 | icmpv6_send(skb2, rel_type, rel_code, rel_info); |
1da177e4 | 707 | |
94e187c0 | 708 | ip6_rt_put(rt); |
1da177e4 LT |
709 | |
710 | kfree_skb(skb2); | |
711 | } | |
e490d1d8 YK |
712 | |
713 | return 0; | |
1da177e4 LT |
714 | } |
715 | ||
f4e0b4c5 ND |
716 | static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
717 | const struct ipv6hdr *ipv6h, | |
718 | struct sk_buff *skb) | |
c4d3efaf YK |
719 | { |
720 | __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; | |
721 | ||
722 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) | |
eddc9ec5 | 723 | ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); |
c4d3efaf | 724 | |
f4e0b4c5 | 725 | return IP6_ECN_decapsulate(ipv6h, skb); |
c4d3efaf YK |
726 | } |
727 | ||
f4e0b4c5 ND |
728 | static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
729 | const struct ipv6hdr *ipv6h, | |
730 | struct sk_buff *skb) | |
1da177e4 | 731 | { |
8359925b | 732 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) |
29bb43b4 | 733 | ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); |
1da177e4 | 734 | |
f4e0b4c5 | 735 | return IP6_ECN_decapsulate(ipv6h, skb); |
1da177e4 | 736 | } |
8359925b | 737 | |
c12b395a | 738 | __u32 ip6_tnl_get_cap(struct ip6_tnl *t, |
d0087b29 VN |
739 | const struct in6_addr *laddr, |
740 | const struct in6_addr *raddr) | |
741 | { | |
c12b395a | 742 | struct __ip6_tnl_parm *p = &t->parms; |
d0087b29 VN |
743 | int ltype = ipv6_addr_type(laddr); |
744 | int rtype = ipv6_addr_type(raddr); | |
745 | __u32 flags = 0; | |
746 | ||
747 | if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) { | |
748 | flags = IP6_TNL_F_CAP_PER_PACKET; | |
749 | } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
750 | rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
751 | !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && | |
752 | (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { | |
753 | if (ltype&IPV6_ADDR_UNICAST) | |
754 | flags |= IP6_TNL_F_CAP_XMIT; | |
755 | if (rtype&IPV6_ADDR_UNICAST) | |
756 | flags |= IP6_TNL_F_CAP_RCV; | |
757 | } | |
758 | return flags; | |
759 | } | |
c12b395a | 760 | EXPORT_SYMBOL(ip6_tnl_get_cap); |
d0087b29 | 761 | |
f1a28eab | 762 | /* called with rcu_read_lock() */ |
c12b395a | 763 | int ip6_tnl_rcv_ctl(struct ip6_tnl *t, |
d0087b29 VN |
764 | const struct in6_addr *laddr, |
765 | const struct in6_addr *raddr) | |
09c6bbf0 | 766 | { |
c12b395a | 767 | struct __ip6_tnl_parm *p = &t->parms; |
09c6bbf0 | 768 | int ret = 0; |
0bd87628 | 769 | struct net *net = t->net; |
09c6bbf0 | 770 | |
d0087b29 VN |
771 | if ((p->flags & IP6_TNL_F_CAP_RCV) || |
772 | ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && | |
773 | (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) { | |
1ab1457c | 774 | struct net_device *ldev = NULL; |
09c6bbf0 VN |
775 | |
776 | if (p->link) | |
f1a28eab | 777 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 778 | |
d0087b29 VN |
779 | if ((ipv6_addr_is_multicast(laddr) || |
780 | likely(ipv6_chk_addr(net, laddr, ldev, 0))) && | |
781 | likely(!ipv6_chk_addr(net, raddr, NULL, 0))) | |
09c6bbf0 | 782 | ret = 1; |
09c6bbf0 VN |
783 | } |
784 | return ret; | |
785 | } | |
c12b395a | 786 | EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl); |
1da177e4 LT |
787 | |
788 | /** | |
3144581c | 789 | * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally |
1da177e4 | 790 | * @skb: received socket buffer |
8359925b YK |
791 | * @protocol: ethernet protocol ID |
792 | * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN | |
1da177e4 LT |
793 | * |
794 | * Return: 0 | |
795 | **/ | |
796 | ||
8359925b | 797 | static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol, |
502b0935 | 798 | __u8 ipproto, |
f4e0b4c5 ND |
799 | int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, |
800 | const struct ipv6hdr *ipv6h, | |
801 | struct sk_buff *skb)) | |
1da177e4 | 802 | { |
1da177e4 | 803 | struct ip6_tnl *t; |
b71d1d42 | 804 | const struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
acf722f7 | 805 | u8 tproto; |
f4e0b4c5 | 806 | int err; |
1da177e4 | 807 | |
2922bc8a | 808 | rcu_read_lock(); |
e5d08d71 | 809 | t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr); |
53b24b8f | 810 | if (t) { |
8f84985f | 811 | struct pcpu_sw_netstats *tstats; |
8560f226 | 812 | |
acf722f7 AA |
813 | tproto = ACCESS_ONCE(t->parms.proto); |
814 | if (tproto != ipproto && tproto != 0) { | |
2922bc8a | 815 | rcu_read_unlock(); |
502b0935 YK |
816 | goto discard; |
817 | } | |
818 | ||
1da177e4 | 819 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
2922bc8a | 820 | rcu_read_unlock(); |
50fba2aa | 821 | goto discard; |
1da177e4 LT |
822 | } |
823 | ||
d0087b29 | 824 | if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) { |
3dca02af | 825 | t->dev->stats.rx_dropped++; |
2922bc8a | 826 | rcu_read_unlock(); |
1da177e4 LT |
827 | goto discard; |
828 | } | |
b0e380b1 | 829 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 830 | skb_reset_network_header(skb); |
8359925b | 831 | skb->protocol = htons(protocol); |
1da177e4 | 832 | memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); |
8359925b | 833 | |
ea23192e | 834 | __skb_tunnel_rx(skb, t->dev, t->net); |
f4e0b4c5 ND |
835 | |
836 | err = dscp_ecn_decapsulate(t, ipv6h, skb); | |
837 | if (unlikely(err)) { | |
838 | if (log_ecn_error) | |
839 | net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n", | |
840 | &ipv6h->saddr, | |
841 | ipv6_get_dsfield(ipv6h)); | |
842 | if (err > 1) { | |
843 | ++t->dev->stats.rx_frame_errors; | |
844 | ++t->dev->stats.rx_errors; | |
845 | rcu_read_unlock(); | |
846 | goto discard; | |
847 | } | |
848 | } | |
849 | ||
8560f226 | 850 | tstats = this_cpu_ptr(t->dev->tstats); |
abb6013c | 851 | u64_stats_update_begin(&tstats->syncp); |
8560f226 ED |
852 | tstats->rx_packets++; |
853 | tstats->rx_bytes += skb->len; | |
abb6013c | 854 | u64_stats_update_end(&tstats->syncp); |
8560f226 | 855 | |
caf586e5 | 856 | netif_rx(skb); |
8990f468 | 857 | |
2922bc8a | 858 | rcu_read_unlock(); |
1da177e4 LT |
859 | return 0; |
860 | } | |
2922bc8a | 861 | rcu_read_unlock(); |
1da177e4 | 862 | return 1; |
50fba2aa HX |
863 | |
864 | discard: | |
865 | kfree_skb(skb); | |
866 | return 0; | |
1da177e4 LT |
867 | } |
868 | ||
c4d3efaf YK |
869 | static int ip4ip6_rcv(struct sk_buff *skb) |
870 | { | |
502b0935 YK |
871 | return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP, |
872 | ip4ip6_dscp_ecn_decapsulate); | |
c4d3efaf YK |
873 | } |
874 | ||
8359925b YK |
875 | static int ip6ip6_rcv(struct sk_buff *skb) |
876 | { | |
502b0935 YK |
877 | return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6, |
878 | ip6ip6_dscp_ecn_decapsulate); | |
8359925b YK |
879 | } |
880 | ||
6fb32dde VN |
881 | struct ipv6_tel_txoption { |
882 | struct ipv6_txoptions ops; | |
883 | __u8 dst_opt[8]; | |
884 | }; | |
1da177e4 | 885 | |
6fb32dde VN |
886 | static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) |
887 | { | |
888 | memset(opt, 0, sizeof(struct ipv6_tel_txoption)); | |
1da177e4 | 889 | |
6fb32dde VN |
890 | opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; |
891 | opt->dst_opt[3] = 1; | |
892 | opt->dst_opt[4] = encap_limit; | |
893 | opt->dst_opt[5] = IPV6_TLV_PADN; | |
894 | opt->dst_opt[6] = 1; | |
1da177e4 | 895 | |
6fb32dde VN |
896 | opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; |
897 | opt->ops.opt_nflen = 8; | |
1da177e4 LT |
898 | } |
899 | ||
900 | /** | |
3144581c | 901 | * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own |
1da177e4 | 902 | * @t: the outgoing tunnel device |
1ab1457c | 903 | * @hdr: IPv6 header from the incoming packet |
1da177e4 LT |
904 | * |
905 | * Description: | |
1ab1457c | 906 | * Avoid trivial tunneling loop by checking that tunnel exit-point |
1da177e4 LT |
907 | * doesn't match source of incoming packet. |
908 | * | |
1ab1457c | 909 | * Return: |
1da177e4 LT |
910 | * 1 if conflict, |
911 | * 0 else | |
912 | **/ | |
913 | ||
92113bfd | 914 | static inline bool |
b71d1d42 | 915 | ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) |
1da177e4 LT |
916 | { |
917 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
918 | } | |
919 | ||
d5005140 SK |
920 | int ip6_tnl_xmit_ctl(struct ip6_tnl *t, |
921 | const struct in6_addr *laddr, | |
922 | const struct in6_addr *raddr) | |
09c6bbf0 | 923 | { |
c12b395a | 924 | struct __ip6_tnl_parm *p = &t->parms; |
09c6bbf0 | 925 | int ret = 0; |
0bd87628 | 926 | struct net *net = t->net; |
09c6bbf0 | 927 | |
d5005140 SK |
928 | if ((p->flags & IP6_TNL_F_CAP_XMIT) || |
929 | ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && | |
930 | (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) { | |
09c6bbf0 VN |
931 | struct net_device *ldev = NULL; |
932 | ||
f1a28eab | 933 | rcu_read_lock(); |
09c6bbf0 | 934 | if (p->link) |
f1a28eab | 935 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 936 | |
d5005140 | 937 | if (unlikely(!ipv6_chk_addr(net, laddr, ldev, 0))) |
f3213831 JP |
938 | pr_warn("%s xmit: Local address not yet configured!\n", |
939 | p->name); | |
d5005140 SK |
940 | else if (!ipv6_addr_is_multicast(raddr) && |
941 | unlikely(ipv6_chk_addr(net, raddr, NULL, 0))) | |
f3213831 JP |
942 | pr_warn("%s xmit: Routing loop! Remote address found on this node!\n", |
943 | p->name); | |
09c6bbf0 VN |
944 | else |
945 | ret = 1; | |
f1a28eab | 946 | rcu_read_unlock(); |
09c6bbf0 VN |
947 | } |
948 | return ret; | |
949 | } | |
c12b395a | 950 | EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl); |
951 | ||
1da177e4 | 952 | /** |
61ec2aec | 953 | * ip6_tnl_xmit2 - encapsulate packet and send |
1da177e4 | 954 | * @skb: the outgoing socket buffer |
1ab1457c | 955 | * @dev: the outgoing tunnel device |
61ec2aec YK |
956 | * @dsfield: dscp code for outer header |
957 | * @fl: flow of tunneled packet | |
958 | * @encap_limit: encapsulation limit | |
959 | * @pmtu: Path MTU is stored if packet is too big | |
1da177e4 LT |
960 | * |
961 | * Description: | |
962 | * Build new header and do some sanity checks on the packet before sending | |
963 | * it. | |
964 | * | |
1ab1457c | 965 | * Return: |
c4d3efaf | 966 | * 0 on success |
61ec2aec YK |
967 | * -1 fail |
968 | * %-EMSGSIZE message too big. return mtu in this case. | |
1da177e4 LT |
969 | **/ |
970 | ||
61ec2aec YK |
971 | static int ip6_tnl_xmit2(struct sk_buff *skb, |
972 | struct net_device *dev, | |
973 | __u8 dsfield, | |
4c9483b2 | 974 | struct flowi6 *fl6, |
61ec2aec YK |
975 | int encap_limit, |
976 | __u32 *pmtu) | |
1da177e4 | 977 | { |
2941a486 | 978 | struct ip6_tnl *t = netdev_priv(dev); |
0bd87628 | 979 | struct net *net = t->net; |
3dca02af | 980 | struct net_device_stats *stats = &t->dev->stats; |
0660e03f | 981 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
6fb32dde | 982 | struct ipv6_tel_txoption opt; |
d24f22f3 | 983 | struct dst_entry *dst = NULL, *ndst = NULL; |
1da177e4 LT |
984 | struct net_device *tdev; |
985 | int mtu; | |
c2636b4d | 986 | unsigned int max_headroom = sizeof(struct ipv6hdr); |
1da177e4 | 987 | u8 proto; |
61ec2aec | 988 | int err = -1; |
1da177e4 | 989 | |
ea3dc960 SK |
990 | /* NBMA tunnel */ |
991 | if (ipv6_addr_any(&t->parms.raddr)) { | |
992 | struct in6_addr *addr6; | |
993 | struct neighbour *neigh; | |
994 | int addr_type; | |
995 | ||
996 | if (!skb_dst(skb)) | |
997 | goto tx_err_link_failure; | |
998 | ||
999 | neigh = dst_neigh_lookup(skb_dst(skb), | |
1000 | &ipv6_hdr(skb)->daddr); | |
1001 | if (!neigh) | |
1002 | goto tx_err_link_failure; | |
1003 | ||
1004 | addr6 = (struct in6_addr *)&neigh->primary_key; | |
1005 | addr_type = ipv6_addr_type(addr6); | |
1006 | ||
1007 | if (addr_type == IPV6_ADDR_ANY) | |
1008 | addr6 = &ipv6_hdr(skb)->daddr; | |
1009 | ||
1010 | memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr)); | |
1011 | neigh_release(neigh); | |
1012 | } else if (!fl6->flowi6_mark) | |
d24f22f3 | 1013 | dst = ip6_tnl_dst_check(t); |
d5005140 SK |
1014 | |
1015 | if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr)) | |
1016 | goto tx_err_link_failure; | |
1017 | ||
89b02126 ED |
1018 | if (!dst) { |
1019 | ndst = ip6_route_output(net, NULL, fl6); | |
1da177e4 | 1020 | |
89b02126 | 1021 | if (ndst->error) |
a57ebc90 | 1022 | goto tx_err_link_failure; |
89b02126 ED |
1023 | ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0); |
1024 | if (IS_ERR(ndst)) { | |
1025 | err = PTR_ERR(ndst); | |
1026 | ndst = NULL; | |
452edd59 DM |
1027 | goto tx_err_link_failure; |
1028 | } | |
89b02126 | 1029 | dst = ndst; |
a57ebc90 | 1030 | } |
1da177e4 LT |
1031 | |
1032 | tdev = dst->dev; | |
1033 | ||
1034 | if (tdev == dev) { | |
1035 | stats->collisions++; | |
e87cc472 JP |
1036 | net_warn_ratelimited("%s: Local routing loop detected!\n", |
1037 | t->parms.name); | |
1da177e4 LT |
1038 | goto tx_err_dst_release; |
1039 | } | |
67ba4152 | 1040 | mtu = dst_mtu(dst) - sizeof(*ipv6h); |
6fb32dde | 1041 | if (encap_limit >= 0) { |
1da177e4 LT |
1042 | max_headroom += 8; |
1043 | mtu -= 8; | |
1044 | } | |
1045 | if (mtu < IPV6_MIN_MTU) | |
1046 | mtu = IPV6_MIN_MTU; | |
adf30907 | 1047 | if (skb_dst(skb)) |
6700c270 | 1048 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); |
1da177e4 | 1049 | if (skb->len > mtu) { |
61ec2aec YK |
1050 | *pmtu = mtu; |
1051 | err = -EMSGSIZE; | |
1da177e4 LT |
1052 | goto tx_err_dst_release; |
1053 | } | |
1054 | ||
963a88b3 | 1055 | skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev))); |
0bd87628 | 1056 | |
1da177e4 LT |
1057 | /* |
1058 | * Okay, now see if we can stuff it in the buffer as-is. | |
1059 | */ | |
1060 | max_headroom += LL_RESERVED_SPACE(tdev); | |
1ab1457c | 1061 | |
cfbba49d PM |
1062 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
1063 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 | 1064 | struct sk_buff *new_skb; |
1ab1457c | 1065 | |
e5d08d71 IM |
1066 | new_skb = skb_realloc_headroom(skb, max_headroom); |
1067 | if (!new_skb) | |
1da177e4 LT |
1068 | goto tx_err_dst_release; |
1069 | ||
1070 | if (skb->sk) | |
1071 | skb_set_owner_w(new_skb, skb->sk); | |
9ff26449 | 1072 | consume_skb(skb); |
1da177e4 LT |
1073 | skb = new_skb; |
1074 | } | |
d24f22f3 ED |
1075 | if (fl6->flowi6_mark) { |
1076 | skb_dst_set(skb, dst); | |
1077 | ndst = NULL; | |
1078 | } else { | |
1079 | skb_dst_set_noref(skb, dst); | |
1080 | } | |
b0e380b1 | 1081 | skb->transport_header = skb->network_header; |
1da177e4 | 1082 | |
4c9483b2 | 1083 | proto = fl6->flowi6_proto; |
6fb32dde VN |
1084 | if (encap_limit >= 0) { |
1085 | init_tel_txopt(&opt, encap_limit); | |
1086 | ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); | |
1087 | } | |
3d483058 HFS |
1088 | |
1089 | if (likely(!skb->encapsulation)) { | |
1090 | skb_reset_inner_headers(skb); | |
1091 | skb->encapsulation = 1; | |
1092 | } | |
1093 | ||
e2d1bca7 ACM |
1094 | skb_push(skb, sizeof(struct ipv6hdr)); |
1095 | skb_reset_network_header(skb); | |
0660e03f | 1096 | ipv6h = ipv6_hdr(skb); |
cb1ce2ef TH |
1097 | ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), |
1098 | ip6_make_flowlabel(net, skb, fl6->flowlabel, false)); | |
1da177e4 LT |
1099 | ipv6h->hop_limit = t->parms.hop_limit; |
1100 | ipv6h->nexthdr = proto; | |
4e3fd7a0 AD |
1101 | ipv6h->saddr = fl6->saddr; |
1102 | ipv6h->daddr = fl6->daddr; | |
79b16aad | 1103 | ip6tunnel_xmit(NULL, skb, dev); |
89b02126 ED |
1104 | if (ndst) |
1105 | ip6_tnl_dst_store(t, ndst); | |
1da177e4 LT |
1106 | return 0; |
1107 | tx_err_link_failure: | |
1108 | stats->tx_carrier_errors++; | |
1109 | dst_link_failure(skb); | |
1110 | tx_err_dst_release: | |
89b02126 | 1111 | dst_release(ndst); |
61ec2aec YK |
1112 | return err; |
1113 | } | |
1114 | ||
c4d3efaf YK |
1115 | static inline int |
1116 | ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1117 | { | |
1118 | struct ip6_tnl *t = netdev_priv(dev); | |
b71d1d42 | 1119 | const struct iphdr *iph = ip_hdr(skb); |
c4d3efaf | 1120 | int encap_limit = -1; |
4c9483b2 | 1121 | struct flowi6 fl6; |
c4d3efaf YK |
1122 | __u8 dsfield; |
1123 | __u32 mtu; | |
acf722f7 | 1124 | u8 tproto; |
c4d3efaf YK |
1125 | int err; |
1126 | ||
acf722f7 | 1127 | tproto = ACCESS_ONCE(t->parms.proto); |
d5005140 | 1128 | if (tproto != IPPROTO_IPIP && tproto != 0) |
c4d3efaf YK |
1129 | return -1; |
1130 | ||
1131 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1132 | encap_limit = t->parms.encap_limit; | |
1133 | ||
67ba4152 | 1134 | memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); |
4c9483b2 | 1135 | fl6.flowi6_proto = IPPROTO_IPIP; |
c4d3efaf YK |
1136 | |
1137 | dsfield = ipv4_get_dsfield(iph); | |
1138 | ||
d24f22f3 | 1139 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
4c9483b2 | 1140 | fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) |
b77f2fa6 | 1141 | & IPV6_TCLASS_MASK; |
d24f22f3 ED |
1142 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
1143 | fl6.flowi6_mark = skb->mark; | |
c4d3efaf | 1144 | |
4c9483b2 | 1145 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); |
c4d3efaf YK |
1146 | if (err != 0) { |
1147 | /* XXX: send ICMP error even if DF is not set. */ | |
1148 | if (err == -EMSGSIZE) | |
1149 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
1150 | htonl(mtu)); | |
1151 | return -1; | |
1152 | } | |
1153 | ||
1154 | return 0; | |
1155 | } | |
1156 | ||
61ec2aec YK |
1157 | static inline int |
1158 | ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1159 | { | |
1160 | struct ip6_tnl *t = netdev_priv(dev); | |
0660e03f | 1161 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
61ec2aec YK |
1162 | int encap_limit = -1; |
1163 | __u16 offset; | |
4c9483b2 | 1164 | struct flowi6 fl6; |
61ec2aec YK |
1165 | __u8 dsfield; |
1166 | __u32 mtu; | |
acf722f7 | 1167 | u8 tproto; |
61ec2aec YK |
1168 | int err; |
1169 | ||
acf722f7 AA |
1170 | tproto = ACCESS_ONCE(t->parms.proto); |
1171 | if ((tproto != IPPROTO_IPV6 && tproto != 0) || | |
d5005140 | 1172 | ip6_tnl_addr_conflict(t, ipv6h)) |
61ec2aec YK |
1173 | return -1; |
1174 | ||
c12b395a | 1175 | offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); |
d56f90a7 | 1176 | if (offset > 0) { |
61ec2aec | 1177 | struct ipv6_tlv_tnl_enc_lim *tel; |
d56f90a7 | 1178 | tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; |
61ec2aec YK |
1179 | if (tel->encap_limit == 0) { |
1180 | icmpv6_send(skb, ICMPV6_PARAMPROB, | |
3ffe533c | 1181 | ICMPV6_HDR_FIELD, offset + 2); |
61ec2aec YK |
1182 | return -1; |
1183 | } | |
1184 | encap_limit = tel->encap_limit - 1; | |
1185 | } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1186 | encap_limit = t->parms.encap_limit; | |
1187 | ||
67ba4152 | 1188 | memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); |
4c9483b2 | 1189 | fl6.flowi6_proto = IPPROTO_IPV6; |
61ec2aec YK |
1190 | |
1191 | dsfield = ipv6_get_dsfield(ipv6h); | |
d24f22f3 | 1192 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
4c9483b2 | 1193 | fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); |
d24f22f3 | 1194 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) |
3308de2b | 1195 | fl6.flowlabel |= ip6_flowlabel(ipv6h); |
d24f22f3 ED |
1196 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
1197 | fl6.flowi6_mark = skb->mark; | |
61ec2aec | 1198 | |
4c9483b2 | 1199 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); |
61ec2aec YK |
1200 | if (err != 0) { |
1201 | if (err == -EMSGSIZE) | |
3ffe533c | 1202 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
61ec2aec YK |
1203 | return -1; |
1204 | } | |
1205 | ||
1206 | return 0; | |
1207 | } | |
1208 | ||
6fef4c0c | 1209 | static netdev_tx_t |
61ec2aec YK |
1210 | ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) |
1211 | { | |
1212 | struct ip6_tnl *t = netdev_priv(dev); | |
3dca02af | 1213 | struct net_device_stats *stats = &t->dev->stats; |
61ec2aec YK |
1214 | int ret; |
1215 | ||
61ec2aec | 1216 | switch (skb->protocol) { |
60678040 | 1217 | case htons(ETH_P_IP): |
c4d3efaf YK |
1218 | ret = ip4ip6_tnl_xmit(skb, dev); |
1219 | break; | |
60678040 | 1220 | case htons(ETH_P_IPV6): |
61ec2aec YK |
1221 | ret = ip6ip6_tnl_xmit(skb, dev); |
1222 | break; | |
1223 | default: | |
1224 | goto tx_err; | |
1225 | } | |
1226 | ||
1227 | if (ret < 0) | |
1228 | goto tx_err; | |
1229 | ||
6ed10654 | 1230 | return NETDEV_TX_OK; |
61ec2aec | 1231 | |
1da177e4 LT |
1232 | tx_err: |
1233 | stats->tx_errors++; | |
1234 | stats->tx_dropped++; | |
1235 | kfree_skb(skb); | |
6ed10654 | 1236 | return NETDEV_TX_OK; |
1da177e4 LT |
1237 | } |
1238 | ||
3144581c | 1239 | static void ip6_tnl_link_config(struct ip6_tnl *t) |
1da177e4 LT |
1240 | { |
1241 | struct net_device *dev = t->dev; | |
c12b395a | 1242 | struct __ip6_tnl_parm *p = &t->parms; |
4c9483b2 | 1243 | struct flowi6 *fl6 = &t->fl.u.ip6; |
1da177e4 | 1244 | |
3a6d54c5 JP |
1245 | memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); |
1246 | memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
1da177e4 LT |
1247 | |
1248 | /* Set up flowi template */ | |
4e3fd7a0 AD |
1249 | fl6->saddr = p->laddr; |
1250 | fl6->daddr = p->raddr; | |
4c9483b2 DM |
1251 | fl6->flowi6_oif = p->link; |
1252 | fl6->flowlabel = 0; | |
1da177e4 LT |
1253 | |
1254 | if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) | |
4c9483b2 | 1255 | fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; |
1da177e4 | 1256 | if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) |
4c9483b2 | 1257 | fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; |
1da177e4 | 1258 | |
d0087b29 VN |
1259 | p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); |
1260 | p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); | |
1da177e4 LT |
1261 | |
1262 | if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) | |
1263 | dev->flags |= IFF_POINTOPOINT; | |
1264 | else | |
1265 | dev->flags &= ~IFF_POINTOPOINT; | |
1266 | ||
1da177e4 | 1267 | if (p->flags & IP6_TNL_F_CAP_XMIT) { |
305d4b3c VN |
1268 | int strict = (ipv6_addr_type(&p->raddr) & |
1269 | (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); | |
1270 | ||
0bd87628 | 1271 | struct rt6_info *rt = rt6_lookup(t->net, |
2f7f54b7 | 1272 | &p->raddr, &p->laddr, |
305d4b3c | 1273 | p->link, strict); |
1da177e4 | 1274 | |
63159f29 | 1275 | if (!rt) |
1da177e4 LT |
1276 | return; |
1277 | ||
d1918542 DM |
1278 | if (rt->dst.dev) { |
1279 | dev->hard_header_len = rt->dst.dev->hard_header_len + | |
67ba4152 | 1280 | sizeof(struct ipv6hdr); |
1da177e4 | 1281 | |
67ba4152 | 1282 | dev->mtu = rt->dst.dev->mtu - sizeof(struct ipv6hdr); |
381601e5 | 1283 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
67ba4152 | 1284 | dev->mtu -= 8; |
1da177e4 LT |
1285 | |
1286 | if (dev->mtu < IPV6_MIN_MTU) | |
1287 | dev->mtu = IPV6_MIN_MTU; | |
1288 | } | |
94e187c0 | 1289 | ip6_rt_put(rt); |
1da177e4 LT |
1290 | } |
1291 | } | |
1292 | ||
1293 | /** | |
3144581c | 1294 | * ip6_tnl_change - update the tunnel parameters |
1da177e4 LT |
1295 | * @t: tunnel to be changed |
1296 | * @p: tunnel configuration parameters | |
1da177e4 LT |
1297 | * |
1298 | * Description: | |
3144581c | 1299 | * ip6_tnl_change() updates the tunnel parameters |
1da177e4 LT |
1300 | **/ |
1301 | ||
1302 | static int | |
c12b395a | 1303 | ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) |
1da177e4 | 1304 | { |
4e3fd7a0 AD |
1305 | t->parms.laddr = p->laddr; |
1306 | t->parms.raddr = p->raddr; | |
1da177e4 LT |
1307 | t->parms.flags = p->flags; |
1308 | t->parms.hop_limit = p->hop_limit; | |
1309 | t->parms.encap_limit = p->encap_limit; | |
1310 | t->parms.flowinfo = p->flowinfo; | |
8181b8c1 | 1311 | t->parms.link = p->link; |
502b0935 | 1312 | t->parms.proto = p->proto; |
0c088890 | 1313 | ip6_tnl_dst_reset(t); |
3144581c | 1314 | ip6_tnl_link_config(t); |
1da177e4 LT |
1315 | return 0; |
1316 | } | |
1317 | ||
0b112457 ND |
1318 | static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) |
1319 | { | |
0bd87628 | 1320 | struct net *net = t->net; |
0b112457 ND |
1321 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1322 | int err; | |
1323 | ||
1324 | ip6_tnl_unlink(ip6n, t); | |
1325 | synchronize_net(); | |
1326 | err = ip6_tnl_change(t, p); | |
1327 | ip6_tnl_link(ip6n, t); | |
1328 | netdev_state_change(t->dev); | |
1329 | return err; | |
1330 | } | |
1331 | ||
acf722f7 AA |
1332 | static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) |
1333 | { | |
1334 | /* for default tnl0 device allow to change only the proto */ | |
1335 | t->parms.proto = p->proto; | |
1336 | netdev_state_change(t->dev); | |
1337 | return 0; | |
1338 | } | |
1339 | ||
c12b395a | 1340 | static void |
1341 | ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u) | |
1342 | { | |
1343 | p->laddr = u->laddr; | |
1344 | p->raddr = u->raddr; | |
1345 | p->flags = u->flags; | |
1346 | p->hop_limit = u->hop_limit; | |
1347 | p->encap_limit = u->encap_limit; | |
1348 | p->flowinfo = u->flowinfo; | |
1349 | p->link = u->link; | |
1350 | p->proto = u->proto; | |
1351 | memcpy(p->name, u->name, sizeof(u->name)); | |
1352 | } | |
1353 | ||
1354 | static void | |
1355 | ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p) | |
1356 | { | |
1357 | u->laddr = p->laddr; | |
1358 | u->raddr = p->raddr; | |
1359 | u->flags = p->flags; | |
1360 | u->hop_limit = p->hop_limit; | |
1361 | u->encap_limit = p->encap_limit; | |
1362 | u->flowinfo = p->flowinfo; | |
1363 | u->link = p->link; | |
1364 | u->proto = p->proto; | |
1365 | memcpy(u->name, p->name, sizeof(u->name)); | |
1366 | } | |
1367 | ||
1da177e4 | 1368 | /** |
3144581c | 1369 | * ip6_tnl_ioctl - configure ipv6 tunnels from userspace |
1da177e4 LT |
1370 | * @dev: virtual device associated with tunnel |
1371 | * @ifr: parameters passed from userspace | |
1372 | * @cmd: command to be performed | |
1373 | * | |
1374 | * Description: | |
3144581c | 1375 | * ip6_tnl_ioctl() is used for managing IPv6 tunnels |
1ab1457c | 1376 | * from userspace. |
1da177e4 LT |
1377 | * |
1378 | * The possible commands are the following: | |
1379 | * %SIOCGETTUNNEL: get tunnel parameters for device | |
1380 | * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters | |
1381 | * %SIOCCHGTUNNEL: change tunnel parameters to those given | |
1382 | * %SIOCDELTUNNEL: delete tunnel | |
1383 | * | |
1ab1457c | 1384 | * The fallback device "ip6tnl0", created during module |
1da177e4 LT |
1385 | * initialization, can be used for creating other tunnel devices. |
1386 | * | |
1387 | * Return: | |
1388 | * 0 on success, | |
1389 | * %-EFAULT if unable to copy data to or from userspace, | |
1390 | * %-EPERM if current process hasn't %CAP_NET_ADMIN set | |
1391 | * %-EINVAL if passed tunnel parameters are invalid, | |
1392 | * %-EEXIST if changing a tunnel's parameters would cause a conflict | |
1393 | * %-ENODEV if attempting to change or delete a nonexisting device | |
1394 | **/ | |
1395 | ||
1396 | static int | |
3144581c | 1397 | ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
1da177e4 LT |
1398 | { |
1399 | int err = 0; | |
1da177e4 | 1400 | struct ip6_tnl_parm p; |
c12b395a | 1401 | struct __ip6_tnl_parm p1; |
74462f0d ND |
1402 | struct ip6_tnl *t = netdev_priv(dev); |
1403 | struct net *net = t->net; | |
2dd02c89 | 1404 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 LT |
1405 | |
1406 | switch (cmd) { | |
1407 | case SIOCGETTUNNEL: | |
15820e12 | 1408 | if (dev == ip6n->fb_tnl_dev) { |
67ba4152 | 1409 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
1da177e4 LT |
1410 | err = -EFAULT; |
1411 | break; | |
1412 | } | |
c12b395a | 1413 | ip6_tnl_parm_from_user(&p1, &p); |
1414 | t = ip6_tnl_locate(net, &p1, 0); | |
37355565 | 1415 | if (IS_ERR(t)) |
74462f0d | 1416 | t = netdev_priv(dev); |
5ef5d6c5 DC |
1417 | } else { |
1418 | memset(&p, 0, sizeof(p)); | |
567131a7 | 1419 | } |
c12b395a | 1420 | ip6_tnl_parm_to_user(&p, &t->parms); |
67ba4152 | 1421 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) { |
1da177e4 LT |
1422 | err = -EFAULT; |
1423 | } | |
1424 | break; | |
1425 | case SIOCADDTUNNEL: | |
1426 | case SIOCCHGTUNNEL: | |
1427 | err = -EPERM; | |
af31f412 | 1428 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 1429 | break; |
567131a7 | 1430 | err = -EFAULT; |
67ba4152 | 1431 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
1da177e4 | 1432 | break; |
567131a7 | 1433 | err = -EINVAL; |
502b0935 YK |
1434 | if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && |
1435 | p.proto != 0) | |
1da177e4 | 1436 | break; |
c12b395a | 1437 | ip6_tnl_parm_from_user(&p1, &p); |
1438 | t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL); | |
acf722f7 | 1439 | if (cmd == SIOCCHGTUNNEL) { |
37355565 | 1440 | if (!IS_ERR(t)) { |
567131a7 VN |
1441 | if (t->dev != dev) { |
1442 | err = -EEXIST; | |
1443 | break; | |
1444 | } | |
1445 | } else | |
1446 | t = netdev_priv(dev); | |
acf722f7 AA |
1447 | if (dev == ip6n->fb_tnl_dev) |
1448 | err = ip6_tnl0_update(t, &p1); | |
1449 | else | |
1450 | err = ip6_tnl_update(t, &p1); | |
1da177e4 | 1451 | } |
37355565 | 1452 | if (!IS_ERR(t)) { |
1da177e4 | 1453 | err = 0; |
c12b395a | 1454 | ip6_tnl_parm_to_user(&p, &t->parms); |
1455 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
567131a7 VN |
1456 | err = -EFAULT; |
1457 | ||
37355565 ND |
1458 | } else { |
1459 | err = PTR_ERR(t); | |
1460 | } | |
1da177e4 LT |
1461 | break; |
1462 | case SIOCDELTUNNEL: | |
1463 | err = -EPERM; | |
af31f412 | 1464 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1465 | break; |
1466 | ||
15820e12 | 1467 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 | 1468 | err = -EFAULT; |
67ba4152 | 1469 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
1da177e4 | 1470 | break; |
567131a7 | 1471 | err = -ENOENT; |
c12b395a | 1472 | ip6_tnl_parm_from_user(&p1, &p); |
1473 | t = ip6_tnl_locate(net, &p1, 0); | |
37355565 | 1474 | if (IS_ERR(t)) |
1da177e4 | 1475 | break; |
567131a7 | 1476 | err = -EPERM; |
15820e12 | 1477 | if (t->dev == ip6n->fb_tnl_dev) |
1da177e4 | 1478 | break; |
567131a7 | 1479 | dev = t->dev; |
1da177e4 | 1480 | } |
22f8cde5 SH |
1481 | err = 0; |
1482 | unregister_netdevice(dev); | |
1da177e4 LT |
1483 | break; |
1484 | default: | |
1485 | err = -EINVAL; | |
1486 | } | |
1487 | return err; | |
1488 | } | |
1489 | ||
1da177e4 | 1490 | /** |
3144581c | 1491 | * ip6_tnl_change_mtu - change mtu manually for tunnel device |
1da177e4 LT |
1492 | * @dev: virtual device associated with tunnel |
1493 | * @new_mtu: the new mtu | |
1494 | * | |
1495 | * Return: | |
1496 | * 0 on success, | |
1497 | * %-EINVAL if mtu too small | |
1498 | **/ | |
1499 | ||
1500 | static int | |
3144581c | 1501 | ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) |
1da177e4 | 1502 | { |
582442d6 OG |
1503 | struct ip6_tnl *tnl = netdev_priv(dev); |
1504 | ||
1505 | if (tnl->parms.proto == IPPROTO_IPIP) { | |
1506 | if (new_mtu < 68) | |
1507 | return -EINVAL; | |
1508 | } else { | |
1509 | if (new_mtu < IPV6_MIN_MTU) | |
1510 | return -EINVAL; | |
1da177e4 | 1511 | } |
582442d6 OG |
1512 | if (new_mtu > 0xFFF8 - dev->hard_header_len) |
1513 | return -EINVAL; | |
1da177e4 LT |
1514 | dev->mtu = new_mtu; |
1515 | return 0; | |
1516 | } | |
1517 | ||
ecf2c06a ND |
1518 | int ip6_tnl_get_iflink(const struct net_device *dev) |
1519 | { | |
1520 | struct ip6_tnl *t = netdev_priv(dev); | |
1521 | ||
1522 | return t->parms.link; | |
1523 | } | |
1524 | EXPORT_SYMBOL(ip6_tnl_get_iflink); | |
1326c3d5 SH |
1525 | |
1526 | static const struct net_device_ops ip6_tnl_netdev_ops = { | |
6c6151da | 1527 | .ndo_init = ip6_tnl_dev_init, |
8560f226 | 1528 | .ndo_uninit = ip6_tnl_dev_uninit, |
1326c3d5 | 1529 | .ndo_start_xmit = ip6_tnl_xmit, |
8560f226 | 1530 | .ndo_do_ioctl = ip6_tnl_ioctl, |
1326c3d5 | 1531 | .ndo_change_mtu = ip6_tnl_change_mtu, |
8560f226 | 1532 | .ndo_get_stats = ip6_get_stats, |
ecf2c06a | 1533 | .ndo_get_iflink = ip6_tnl_get_iflink, |
1326c3d5 SH |
1534 | }; |
1535 | ||
8560f226 | 1536 | |
1da177e4 | 1537 | /** |
3144581c | 1538 | * ip6_tnl_dev_setup - setup virtual tunnel device |
1da177e4 LT |
1539 | * @dev: virtual device associated with tunnel |
1540 | * | |
1541 | * Description: | |
1542 | * Initialize function pointers and device parameters | |
1543 | **/ | |
1544 | ||
3144581c | 1545 | static void ip6_tnl_dev_setup(struct net_device *dev) |
1da177e4 | 1546 | { |
381601e5 AF |
1547 | struct ip6_tnl *t; |
1548 | ||
1326c3d5 | 1549 | dev->netdev_ops = &ip6_tnl_netdev_ops; |
8560f226 | 1550 | dev->destructor = ip6_dev_free; |
1da177e4 LT |
1551 | |
1552 | dev->type = ARPHRD_TUNNEL6; | |
67ba4152 IM |
1553 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr); |
1554 | dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr); | |
381601e5 AF |
1555 | t = netdev_priv(dev); |
1556 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
67ba4152 | 1557 | dev->mtu -= 8; |
1da177e4 LT |
1558 | dev->flags |= IFF_NOARP; |
1559 | dev->addr_len = sizeof(struct in6_addr); | |
02875878 | 1560 | netif_keep_dst(dev); |
e837735e ND |
1561 | /* This perm addr will be used as interface identifier by IPv6 */ |
1562 | dev->addr_assign_type = NET_ADDR_RANDOM; | |
1563 | eth_random_addr(dev->perm_addr); | |
1da177e4 LT |
1564 | } |
1565 | ||
1566 | ||
1567 | /** | |
3144581c | 1568 | * ip6_tnl_dev_init_gen - general initializer for all tunnel devices |
1da177e4 LT |
1569 | * @dev: virtual device associated with tunnel |
1570 | **/ | |
1571 | ||
8560f226 | 1572 | static inline int |
3144581c | 1573 | ip6_tnl_dev_init_gen(struct net_device *dev) |
1da177e4 | 1574 | { |
2941a486 | 1575 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 | 1576 | |
1da177e4 | 1577 | t->dev = dev; |
0bd87628 | 1578 | t->net = dev_net(dev); |
1c213bd2 | 1579 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
8560f226 ED |
1580 | if (!dev->tstats) |
1581 | return -ENOMEM; | |
1582 | return 0; | |
1da177e4 LT |
1583 | } |
1584 | ||
1585 | /** | |
3144581c | 1586 | * ip6_tnl_dev_init - initializer for all non fallback tunnel devices |
1da177e4 LT |
1587 | * @dev: virtual device associated with tunnel |
1588 | **/ | |
1589 | ||
8560f226 | 1590 | static int ip6_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1591 | { |
2941a486 | 1592 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 ED |
1593 | int err = ip6_tnl_dev_init_gen(dev); |
1594 | ||
1595 | if (err) | |
1596 | return err; | |
3144581c | 1597 | ip6_tnl_link_config(t); |
8560f226 | 1598 | return 0; |
1da177e4 LT |
1599 | } |
1600 | ||
1601 | /** | |
3144581c | 1602 | * ip6_fb_tnl_dev_init - initializer for fallback tunnel device |
1da177e4 LT |
1603 | * @dev: fallback device |
1604 | * | |
1605 | * Return: 0 | |
1606 | **/ | |
1607 | ||
8560f226 | 1608 | static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1609 | { |
2941a486 | 1610 | struct ip6_tnl *t = netdev_priv(dev); |
3e6c9fb5 PE |
1611 | struct net *net = dev_net(dev); |
1612 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1613 | ||
502b0935 | 1614 | t->parms.proto = IPPROTO_IPV6; |
1da177e4 | 1615 | dev_hold(dev); |
d0087b29 | 1616 | |
cf778b00 | 1617 | rcu_assign_pointer(ip6n->tnls_wc[0], t); |
8560f226 | 1618 | return 0; |
1da177e4 LT |
1619 | } |
1620 | ||
0b112457 ND |
1621 | static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[]) |
1622 | { | |
1623 | u8 proto; | |
1624 | ||
c8965932 | 1625 | if (!data || !data[IFLA_IPTUN_PROTO]) |
0b112457 ND |
1626 | return 0; |
1627 | ||
1628 | proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1629 | if (proto != IPPROTO_IPV6 && | |
1630 | proto != IPPROTO_IPIP && | |
1631 | proto != 0) | |
1632 | return -EINVAL; | |
1633 | ||
1634 | return 0; | |
1635 | } | |
1636 | ||
1637 | static void ip6_tnl_netlink_parms(struct nlattr *data[], | |
1638 | struct __ip6_tnl_parm *parms) | |
1639 | { | |
1640 | memset(parms, 0, sizeof(*parms)); | |
1641 | ||
1642 | if (!data) | |
1643 | return; | |
1644 | ||
1645 | if (data[IFLA_IPTUN_LINK]) | |
1646 | parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); | |
1647 | ||
1648 | if (data[IFLA_IPTUN_LOCAL]) | |
67b61f6c | 1649 | parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]); |
0b112457 ND |
1650 | |
1651 | if (data[IFLA_IPTUN_REMOTE]) | |
67b61f6c | 1652 | parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]); |
0b112457 ND |
1653 | |
1654 | if (data[IFLA_IPTUN_TTL]) | |
1655 | parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]); | |
1656 | ||
1657 | if (data[IFLA_IPTUN_ENCAP_LIMIT]) | |
1658 | parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]); | |
1659 | ||
1660 | if (data[IFLA_IPTUN_FLOWINFO]) | |
1ff05fb7 | 1661 | parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]); |
0b112457 ND |
1662 | |
1663 | if (data[IFLA_IPTUN_FLAGS]) | |
1664 | parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]); | |
1665 | ||
1666 | if (data[IFLA_IPTUN_PROTO]) | |
1667 | parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1668 | } | |
1669 | ||
1670 | static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev, | |
1671 | struct nlattr *tb[], struct nlattr *data[]) | |
1672 | { | |
1673 | struct net *net = dev_net(dev); | |
37355565 | 1674 | struct ip6_tnl *nt, *t; |
0b112457 ND |
1675 | |
1676 | nt = netdev_priv(dev); | |
1677 | ip6_tnl_netlink_parms(data, &nt->parms); | |
1678 | ||
37355565 ND |
1679 | t = ip6_tnl_locate(net, &nt->parms, 0); |
1680 | if (!IS_ERR(t)) | |
0b112457 ND |
1681 | return -EEXIST; |
1682 | ||
1683 | return ip6_tnl_create2(dev); | |
1684 | } | |
1685 | ||
1686 | static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[], | |
1687 | struct nlattr *data[]) | |
1688 | { | |
0bd87628 | 1689 | struct ip6_tnl *t = netdev_priv(dev); |
0b112457 | 1690 | struct __ip6_tnl_parm p; |
0bd87628 | 1691 | struct net *net = t->net; |
0b112457 ND |
1692 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1693 | ||
1694 | if (dev == ip6n->fb_tnl_dev) | |
1695 | return -EINVAL; | |
1696 | ||
1697 | ip6_tnl_netlink_parms(data, &p); | |
1698 | ||
1699 | t = ip6_tnl_locate(net, &p, 0); | |
37355565 | 1700 | if (!IS_ERR(t)) { |
0b112457 ND |
1701 | if (t->dev != dev) |
1702 | return -EEXIST; | |
1703 | } else | |
1704 | t = netdev_priv(dev); | |
1705 | ||
1706 | return ip6_tnl_update(t, &p); | |
1707 | } | |
1708 | ||
1e9f3d6f ND |
1709 | static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head) |
1710 | { | |
1711 | struct net *net = dev_net(dev); | |
1712 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1713 | ||
1714 | if (dev != ip6n->fb_tnl_dev) | |
1715 | unregister_netdevice_queue(dev, head); | |
1716 | } | |
1717 | ||
b58d731a | 1718 | static size_t ip6_tnl_get_size(const struct net_device *dev) |
c075b130 ND |
1719 | { |
1720 | return | |
1721 | /* IFLA_IPTUN_LINK */ | |
1722 | nla_total_size(4) + | |
1723 | /* IFLA_IPTUN_LOCAL */ | |
1724 | nla_total_size(sizeof(struct in6_addr)) + | |
1725 | /* IFLA_IPTUN_REMOTE */ | |
1726 | nla_total_size(sizeof(struct in6_addr)) + | |
1727 | /* IFLA_IPTUN_TTL */ | |
1728 | nla_total_size(1) + | |
1729 | /* IFLA_IPTUN_ENCAP_LIMIT */ | |
1730 | nla_total_size(1) + | |
1731 | /* IFLA_IPTUN_FLOWINFO */ | |
1732 | nla_total_size(4) + | |
1733 | /* IFLA_IPTUN_FLAGS */ | |
1734 | nla_total_size(4) + | |
cfa323b6 ND |
1735 | /* IFLA_IPTUN_PROTO */ |
1736 | nla_total_size(1) + | |
c075b130 ND |
1737 | 0; |
1738 | } | |
1739 | ||
b58d731a | 1740 | static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev) |
c075b130 ND |
1741 | { |
1742 | struct ip6_tnl *tunnel = netdev_priv(dev); | |
1743 | struct __ip6_tnl_parm *parm = &tunnel->parms; | |
1744 | ||
1745 | if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || | |
930345ea JB |
1746 | nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) || |
1747 | nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) || | |
c075b130 ND |
1748 | nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) || |
1749 | nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) || | |
1750 | nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) || | |
cfa323b6 ND |
1751 | nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) || |
1752 | nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto)) | |
c075b130 ND |
1753 | goto nla_put_failure; |
1754 | return 0; | |
1755 | ||
1756 | nla_put_failure: | |
1757 | return -EMSGSIZE; | |
1758 | } | |
1759 | ||
1728d4fa ND |
1760 | struct net *ip6_tnl_get_link_net(const struct net_device *dev) |
1761 | { | |
1762 | struct ip6_tnl *tunnel = netdev_priv(dev); | |
1763 | ||
1764 | return tunnel->net; | |
1765 | } | |
1766 | EXPORT_SYMBOL(ip6_tnl_get_link_net); | |
1767 | ||
0b112457 ND |
1768 | static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = { |
1769 | [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, | |
1770 | [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) }, | |
1771 | [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) }, | |
1772 | [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, | |
1773 | [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 }, | |
1774 | [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 }, | |
1775 | [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 }, | |
1776 | [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, | |
1777 | }; | |
1778 | ||
c075b130 ND |
1779 | static struct rtnl_link_ops ip6_link_ops __read_mostly = { |
1780 | .kind = "ip6tnl", | |
1781 | .maxtype = IFLA_IPTUN_MAX, | |
0b112457 | 1782 | .policy = ip6_tnl_policy, |
c075b130 | 1783 | .priv_size = sizeof(struct ip6_tnl), |
0b112457 ND |
1784 | .setup = ip6_tnl_dev_setup, |
1785 | .validate = ip6_tnl_validate, | |
1786 | .newlink = ip6_tnl_newlink, | |
1787 | .changelink = ip6_tnl_changelink, | |
1e9f3d6f | 1788 | .dellink = ip6_tnl_dellink, |
b58d731a ND |
1789 | .get_size = ip6_tnl_get_size, |
1790 | .fill_info = ip6_tnl_fill_info, | |
1728d4fa | 1791 | .get_link_net = ip6_tnl_get_link_net, |
c075b130 ND |
1792 | }; |
1793 | ||
3ff2cfa5 | 1794 | static struct xfrm6_tunnel ip4ip6_handler __read_mostly = { |
c4d3efaf YK |
1795 | .handler = ip4ip6_rcv, |
1796 | .err_handler = ip4ip6_err, | |
1797 | .priority = 1, | |
1798 | }; | |
1799 | ||
3ff2cfa5 | 1800 | static struct xfrm6_tunnel ip6ip6_handler __read_mostly = { |
0303770d PM |
1801 | .handler = ip6ip6_rcv, |
1802 | .err_handler = ip6ip6_err, | |
d2acc347 | 1803 | .priority = 1, |
1da177e4 LT |
1804 | }; |
1805 | ||
1e9f3d6f | 1806 | static void __net_exit ip6_tnl_destroy_tunnels(struct net *net) |
3e6c9fb5 | 1807 | { |
1e9f3d6f | 1808 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
0bd87628 | 1809 | struct net_device *dev, *aux; |
3e6c9fb5 PE |
1810 | int h; |
1811 | struct ip6_tnl *t; | |
cf4432f5 | 1812 | LIST_HEAD(list); |
3e6c9fb5 | 1813 | |
0bd87628 ND |
1814 | for_each_netdev_safe(net, dev, aux) |
1815 | if (dev->rtnl_link_ops == &ip6_link_ops) | |
1816 | unregister_netdevice_queue(dev, &list); | |
1817 | ||
3e6c9fb5 | 1818 | for (h = 0; h < HASH_SIZE; h++) { |
94767632 | 1819 | t = rtnl_dereference(ip6n->tnls_r_l[h]); |
53b24b8f | 1820 | while (t) { |
0bd87628 ND |
1821 | /* If dev is in the same netns, it has already |
1822 | * been added to the list by the previous loop. | |
1823 | */ | |
1824 | if (!net_eq(dev_net(t->dev), net)) | |
1825 | unregister_netdevice_queue(t->dev, &list); | |
94767632 | 1826 | t = rtnl_dereference(t->next); |
cf4432f5 | 1827 | } |
3e6c9fb5 PE |
1828 | } |
1829 | ||
cf4432f5 | 1830 | unregister_netdevice_many(&list); |
3e6c9fb5 PE |
1831 | } |
1832 | ||
2c8c1e72 | 1833 | static int __net_init ip6_tnl_init_net(struct net *net) |
13eeb8e9 | 1834 | { |
ac31cd3c | 1835 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
731abb9c | 1836 | struct ip6_tnl *t = NULL; |
13eeb8e9 | 1837 | int err; |
13eeb8e9 | 1838 | |
3e6c9fb5 PE |
1839 | ip6n->tnls[0] = ip6n->tnls_wc; |
1840 | ip6n->tnls[1] = ip6n->tnls_r_l; | |
1841 | ||
15820e12 PE |
1842 | err = -ENOMEM; |
1843 | ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", | |
c835a677 | 1844 | NET_NAME_UNKNOWN, ip6_tnl_dev_setup); |
15820e12 PE |
1845 | |
1846 | if (!ip6n->fb_tnl_dev) | |
1847 | goto err_alloc_dev; | |
be77e593 | 1848 | dev_net_set(ip6n->fb_tnl_dev, net); |
bb814094 | 1849 | ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops; |
0bd87628 ND |
1850 | /* FB netdevice is special: we have one, and only one per netns. |
1851 | * Allowing to move it to another netns is clearly unsafe. | |
1852 | */ | |
1853 | ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL; | |
15820e12 | 1854 | |
8560f226 ED |
1855 | err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); |
1856 | if (err < 0) | |
1857 | goto err_register; | |
15820e12 PE |
1858 | |
1859 | err = register_netdev(ip6n->fb_tnl_dev); | |
1860 | if (err < 0) | |
1861 | goto err_register; | |
731abb9c JB |
1862 | |
1863 | t = netdev_priv(ip6n->fb_tnl_dev); | |
1864 | ||
1865 | strcpy(t->parms.name, ip6n->fb_tnl_dev->name); | |
13eeb8e9 PE |
1866 | return 0; |
1867 | ||
15820e12 | 1868 | err_register: |
8560f226 | 1869 | ip6_dev_free(ip6n->fb_tnl_dev); |
15820e12 | 1870 | err_alloc_dev: |
13eeb8e9 PE |
1871 | return err; |
1872 | } | |
1873 | ||
2c8c1e72 | 1874 | static void __net_exit ip6_tnl_exit_net(struct net *net) |
13eeb8e9 | 1875 | { |
3e6c9fb5 | 1876 | rtnl_lock(); |
1e9f3d6f | 1877 | ip6_tnl_destroy_tunnels(net); |
3e6c9fb5 | 1878 | rtnl_unlock(); |
13eeb8e9 PE |
1879 | } |
1880 | ||
1881 | static struct pernet_operations ip6_tnl_net_ops = { | |
1882 | .init = ip6_tnl_init_net, | |
1883 | .exit = ip6_tnl_exit_net, | |
ac31cd3c EB |
1884 | .id = &ip6_tnl_net_id, |
1885 | .size = sizeof(struct ip6_tnl_net), | |
13eeb8e9 PE |
1886 | }; |
1887 | ||
1da177e4 LT |
1888 | /** |
1889 | * ip6_tunnel_init - register protocol and reserve needed resources | |
1890 | * | |
1891 | * Return: 0 on success | |
1892 | **/ | |
1893 | ||
1894 | static int __init ip6_tunnel_init(void) | |
1895 | { | |
1896 | int err; | |
1897 | ||
d5aa407f AD |
1898 | err = register_pernet_device(&ip6_tnl_net_ops); |
1899 | if (err < 0) | |
1900 | goto out_pernet; | |
1901 | ||
1902 | err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET); | |
1903 | if (err < 0) { | |
f3213831 | 1904 | pr_err("%s: can't register ip4ip6\n", __func__); |
d5aa407f | 1905 | goto out_ip4ip6; |
c4d3efaf YK |
1906 | } |
1907 | ||
d5aa407f AD |
1908 | err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6); |
1909 | if (err < 0) { | |
f3213831 | 1910 | pr_err("%s: can't register ip6ip6\n", __func__); |
d5aa407f | 1911 | goto out_ip6ip6; |
1da177e4 | 1912 | } |
c075b130 ND |
1913 | err = rtnl_link_register(&ip6_link_ops); |
1914 | if (err < 0) | |
1915 | goto rtnl_link_failed; | |
13eeb8e9 | 1916 | |
1da177e4 | 1917 | return 0; |
d5aa407f | 1918 | |
c075b130 ND |
1919 | rtnl_link_failed: |
1920 | xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6); | |
d5aa407f | 1921 | out_ip6ip6: |
c4d3efaf | 1922 | xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); |
d5aa407f AD |
1923 | out_ip4ip6: |
1924 | unregister_pernet_device(&ip6_tnl_net_ops); | |
1925 | out_pernet: | |
1da177e4 LT |
1926 | return err; |
1927 | } | |
1928 | ||
1929 | /** | |
1930 | * ip6_tunnel_cleanup - free resources and unregister protocol | |
1931 | **/ | |
1932 | ||
1933 | static void __exit ip6_tunnel_cleanup(void) | |
1934 | { | |
c075b130 | 1935 | rtnl_link_unregister(&ip6_link_ops); |
c4d3efaf | 1936 | if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) |
f3213831 | 1937 | pr_info("%s: can't deregister ip4ip6\n", __func__); |
c4d3efaf | 1938 | |
73d605d1 | 1939 | if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) |
f3213831 | 1940 | pr_info("%s: can't deregister ip6ip6\n", __func__); |
1da177e4 | 1941 | |
ac31cd3c | 1942 | unregister_pernet_device(&ip6_tnl_net_ops); |
1da177e4 LT |
1943 | } |
1944 | ||
1945 | module_init(ip6_tunnel_init); | |
1946 | module_exit(ip6_tunnel_cleanup); |