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 | |
1da177e4 | 67 | #ifdef IP6_TNL_DEBUG |
91df42be | 68 | #define IP6_TNL_TRACE(x...) pr_debug("%s:" x "\n", __func__) |
1da177e4 LT |
69 | #else |
70 | #define IP6_TNL_TRACE(x...) do {;} while(0) | |
71 | #endif | |
72 | ||
ddbe5032 ED |
73 | #define HASH_SIZE_SHIFT 5 |
74 | #define HASH_SIZE (1 << HASH_SIZE_SHIFT) | |
1da177e4 | 75 | |
f4e0b4c5 ND |
76 | static bool log_ecn_error = true; |
77 | module_param(log_ecn_error, bool, 0644); | |
78 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); | |
79 | ||
ddbe5032 ED |
80 | static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2) |
81 | { | |
82 | u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2); | |
83 | ||
84 | return hash_32(hash, HASH_SIZE_SHIFT); | |
85 | } | |
1da177e4 | 86 | |
8560f226 | 87 | static int ip6_tnl_dev_init(struct net_device *dev); |
3144581c | 88 | static void ip6_tnl_dev_setup(struct net_device *dev); |
c075b130 | 89 | static struct rtnl_link_ops ip6_link_ops __read_mostly; |
1da177e4 | 90 | |
f99189b1 | 91 | static int ip6_tnl_net_id __read_mostly; |
13eeb8e9 | 92 | struct ip6_tnl_net { |
15820e12 PE |
93 | /* the IPv6 tunnel fallback device */ |
94 | struct net_device *fb_tnl_dev; | |
3e6c9fb5 | 95 | /* lists for storing tunnels in use */ |
94767632 ED |
96 | struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE]; |
97 | struct ip6_tnl __rcu *tnls_wc[1]; | |
98 | struct ip6_tnl __rcu **tnls[2]; | |
13eeb8e9 PE |
99 | }; |
100 | ||
8560f226 ED |
101 | static struct net_device_stats *ip6_get_stats(struct net_device *dev) |
102 | { | |
56a4342d | 103 | struct pcpu_sw_netstats tmp, sum = { 0 }; |
8560f226 ED |
104 | int i; |
105 | ||
106 | for_each_possible_cpu(i) { | |
abb6013c | 107 | unsigned int start; |
8f84985f LR |
108 | const struct pcpu_sw_netstats *tstats = |
109 | per_cpu_ptr(dev->tstats, i); | |
8560f226 | 110 | |
abb6013c | 111 | do { |
57a7744e | 112 | start = u64_stats_fetch_begin_irq(&tstats->syncp); |
abb6013c LR |
113 | tmp.rx_packets = tstats->rx_packets; |
114 | tmp.rx_bytes = tstats->rx_bytes; | |
115 | tmp.tx_packets = tstats->tx_packets; | |
116 | tmp.tx_bytes = tstats->tx_bytes; | |
57a7744e | 117 | } while (u64_stats_fetch_retry_irq(&tstats->syncp, start)); |
abb6013c LR |
118 | |
119 | sum.rx_packets += tmp.rx_packets; | |
120 | sum.rx_bytes += tmp.rx_bytes; | |
121 | sum.tx_packets += tmp.tx_packets; | |
122 | sum.tx_bytes += tmp.tx_bytes; | |
8560f226 ED |
123 | } |
124 | dev->stats.rx_packets = sum.rx_packets; | |
125 | dev->stats.rx_bytes = sum.rx_bytes; | |
126 | dev->stats.tx_packets = sum.tx_packets; | |
127 | dev->stats.tx_bytes = sum.tx_bytes; | |
128 | return &dev->stats; | |
129 | } | |
130 | ||
2922bc8a | 131 | /* |
94767632 | 132 | * Locking : hash tables are protected by RCU and RTNL |
2922bc8a | 133 | */ |
1da177e4 | 134 | |
c12b395a | 135 | struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t) |
1da177e4 LT |
136 | { |
137 | struct dst_entry *dst = t->dst_cache; | |
138 | ||
1ab1457c | 139 | if (dst && dst->obsolete && |
1da177e4 LT |
140 | dst->ops->check(dst, t->dst_cookie) == NULL) { |
141 | t->dst_cache = NULL; | |
142 | dst_release(dst); | |
143 | return NULL; | |
144 | } | |
145 | ||
146 | return dst; | |
147 | } | |
c12b395a | 148 | EXPORT_SYMBOL_GPL(ip6_tnl_dst_check); |
1da177e4 | 149 | |
c12b395a | 150 | void ip6_tnl_dst_reset(struct ip6_tnl *t) |
1da177e4 LT |
151 | { |
152 | dst_release(t->dst_cache); | |
153 | t->dst_cache = NULL; | |
154 | } | |
c12b395a | 155 | EXPORT_SYMBOL_GPL(ip6_tnl_dst_reset); |
1da177e4 | 156 | |
c12b395a | 157 | void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst) |
1da177e4 LT |
158 | { |
159 | struct rt6_info *rt = (struct rt6_info *) dst; | |
160 | t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0; | |
161 | dst_release(t->dst_cache); | |
162 | t->dst_cache = dst; | |
163 | } | |
c12b395a | 164 | EXPORT_SYMBOL_GPL(ip6_tnl_dst_store); |
1da177e4 LT |
165 | |
166 | /** | |
3144581c | 167 | * ip6_tnl_lookup - fetch tunnel matching the end-point addresses |
1ab1457c YH |
168 | * @remote: the address of the tunnel exit-point |
169 | * @local: the address of the tunnel entry-point | |
1da177e4 | 170 | * |
1ab1457c | 171 | * Return: |
1da177e4 | 172 | * tunnel matching given end-points if found, |
1ab1457c | 173 | * else fallback tunnel if its device is up, |
1da177e4 LT |
174 | * else %NULL |
175 | **/ | |
176 | ||
2922bc8a ED |
177 | #define for_each_ip6_tunnel_rcu(start) \ |
178 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) | |
179 | ||
1da177e4 | 180 | static struct ip6_tnl * |
b71d1d42 | 181 | ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local) |
1da177e4 | 182 | { |
ddbe5032 | 183 | unsigned int hash = HASH(remote, local); |
1da177e4 | 184 | struct ip6_tnl *t; |
3e6c9fb5 | 185 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 186 | |
ddbe5032 | 187 | for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { |
1da177e4 LT |
188 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
189 | ipv6_addr_equal(remote, &t->parms.raddr) && | |
190 | (t->dev->flags & IFF_UP)) | |
191 | return t; | |
192 | } | |
2922bc8a ED |
193 | t = rcu_dereference(ip6n->tnls_wc[0]); |
194 | if (t && (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
195 | return t; |
196 | ||
197 | return NULL; | |
198 | } | |
199 | ||
200 | /** | |
3144581c | 201 | * ip6_tnl_bucket - get head of list matching given tunnel parameters |
1ab1457c | 202 | * @p: parameters containing tunnel end-points |
1da177e4 LT |
203 | * |
204 | * Description: | |
3144581c | 205 | * ip6_tnl_bucket() returns the head of the list matching the |
1da177e4 LT |
206 | * &struct in6_addr entries laddr and raddr in @p. |
207 | * | |
1ab1457c | 208 | * Return: head of IPv6 tunnel list |
1da177e4 LT |
209 | **/ |
210 | ||
94767632 | 211 | static struct ip6_tnl __rcu ** |
c12b395a | 212 | ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p) |
1da177e4 | 213 | { |
b71d1d42 ED |
214 | const struct in6_addr *remote = &p->raddr; |
215 | const struct in6_addr *local = &p->laddr; | |
95c96174 | 216 | unsigned int h = 0; |
1da177e4 LT |
217 | int prio = 0; |
218 | ||
219 | if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { | |
220 | prio = 1; | |
ddbe5032 | 221 | h = HASH(remote, local); |
1da177e4 | 222 | } |
3e6c9fb5 | 223 | return &ip6n->tnls[prio][h]; |
1da177e4 LT |
224 | } |
225 | ||
226 | /** | |
3144581c | 227 | * ip6_tnl_link - add tunnel to hash table |
1da177e4 LT |
228 | * @t: tunnel to be added |
229 | **/ | |
230 | ||
231 | static void | |
2dd02c89 | 232 | ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 233 | { |
94767632 | 234 | struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms); |
1da177e4 | 235 | |
cf778b00 ED |
236 | rcu_assign_pointer(t->next , rtnl_dereference(*tp)); |
237 | rcu_assign_pointer(*tp, t); | |
1da177e4 LT |
238 | } |
239 | ||
240 | /** | |
3144581c | 241 | * ip6_tnl_unlink - remove tunnel from hash table |
1da177e4 LT |
242 | * @t: tunnel to be removed |
243 | **/ | |
244 | ||
245 | static void | |
2dd02c89 | 246 | ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 247 | { |
94767632 ED |
248 | struct ip6_tnl __rcu **tp; |
249 | struct ip6_tnl *iter; | |
250 | ||
251 | for (tp = ip6_tnl_bucket(ip6n, &t->parms); | |
252 | (iter = rtnl_dereference(*tp)) != NULL; | |
253 | tp = &iter->next) { | |
254 | if (t == iter) { | |
cf778b00 | 255 | rcu_assign_pointer(*tp, t->next); |
1da177e4 LT |
256 | break; |
257 | } | |
258 | } | |
259 | } | |
260 | ||
8560f226 ED |
261 | static void ip6_dev_free(struct net_device *dev) |
262 | { | |
263 | free_percpu(dev->tstats); | |
264 | free_netdev(dev); | |
265 | } | |
266 | ||
0b112457 ND |
267 | static int ip6_tnl_create2(struct net_device *dev) |
268 | { | |
269 | struct ip6_tnl *t = netdev_priv(dev); | |
270 | struct net *net = dev_net(dev); | |
271 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
272 | int err; | |
273 | ||
274 | t = netdev_priv(dev); | |
275 | err = ip6_tnl_dev_init(dev); | |
276 | if (err < 0) | |
277 | goto out; | |
278 | ||
279 | err = register_netdevice(dev); | |
280 | if (err < 0) | |
281 | goto out; | |
282 | ||
283 | strcpy(t->parms.name, dev->name); | |
284 | dev->rtnl_link_ops = &ip6_link_ops; | |
285 | ||
286 | dev_hold(dev); | |
287 | ip6_tnl_link(ip6n, t); | |
288 | return 0; | |
289 | ||
290 | out: | |
291 | return err; | |
292 | } | |
293 | ||
1da177e4 | 294 | /** |
2c53040f | 295 | * ip6_tnl_create - create a new tunnel |
1da177e4 LT |
296 | * @p: tunnel parameters |
297 | * @pt: pointer to new tunnel | |
298 | * | |
299 | * Description: | |
300 | * Create tunnel matching given parameters. | |
1ab1457c YH |
301 | * |
302 | * Return: | |
567131a7 | 303 | * created tunnel or NULL |
1da177e4 LT |
304 | **/ |
305 | ||
c12b395a | 306 | static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p) |
1da177e4 LT |
307 | { |
308 | struct net_device *dev; | |
309 | struct ip6_tnl *t; | |
310 | char name[IFNAMSIZ]; | |
311 | int err; | |
312 | ||
34cc7ba6 | 313 | if (p->name[0]) |
1da177e4 | 314 | strlcpy(name, p->name, IFNAMSIZ); |
34cc7ba6 PE |
315 | else |
316 | sprintf(name, "ip6tnl%%d"); | |
317 | ||
3144581c | 318 | dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup); |
1da177e4 | 319 | if (dev == NULL) |
567131a7 | 320 | goto failed; |
1da177e4 | 321 | |
554eb277 PE |
322 | dev_net_set(dev, net); |
323 | ||
2941a486 | 324 | t = netdev_priv(dev); |
1da177e4 | 325 | t->parms = *p; |
0bd87628 | 326 | t->net = dev_net(dev); |
0b112457 | 327 | err = ip6_tnl_create2(dev); |
8560f226 ED |
328 | if (err < 0) |
329 | goto failed_free; | |
1da177e4 | 330 | |
567131a7 | 331 | return t; |
b37d428b PE |
332 | |
333 | failed_free: | |
8560f226 | 334 | ip6_dev_free(dev); |
567131a7 VN |
335 | failed: |
336 | return NULL; | |
1da177e4 LT |
337 | } |
338 | ||
339 | /** | |
3144581c | 340 | * ip6_tnl_locate - find or create tunnel matching given parameters |
1ab1457c | 341 | * @p: tunnel parameters |
1da177e4 LT |
342 | * @create: != 0 if allowed to create new tunnel if no match found |
343 | * | |
344 | * Description: | |
3144581c | 345 | * ip6_tnl_locate() first tries to locate an existing tunnel |
1da177e4 LT |
346 | * based on @parms. If this is unsuccessful, but @create is set a new |
347 | * tunnel device is created and registered for use. | |
348 | * | |
349 | * Return: | |
567131a7 | 350 | * matching tunnel or NULL |
1da177e4 LT |
351 | **/ |
352 | ||
2dd02c89 | 353 | static struct ip6_tnl *ip6_tnl_locate(struct net *net, |
c12b395a | 354 | struct __ip6_tnl_parm *p, int create) |
1da177e4 | 355 | { |
b71d1d42 ED |
356 | const struct in6_addr *remote = &p->raddr; |
357 | const struct in6_addr *local = &p->laddr; | |
94767632 | 358 | struct ip6_tnl __rcu **tp; |
1da177e4 | 359 | struct ip6_tnl *t; |
2dd02c89 | 360 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 361 | |
94767632 ED |
362 | for (tp = ip6_tnl_bucket(ip6n, p); |
363 | (t = rtnl_dereference(*tp)) != NULL; | |
364 | tp = &t->next) { | |
1da177e4 | 365 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
567131a7 VN |
366 | ipv6_addr_equal(remote, &t->parms.raddr)) |
367 | return t; | |
1da177e4 LT |
368 | } |
369 | if (!create) | |
567131a7 | 370 | return NULL; |
2dd02c89 | 371 | return ip6_tnl_create(net, p); |
1da177e4 LT |
372 | } |
373 | ||
374 | /** | |
3144581c | 375 | * ip6_tnl_dev_uninit - tunnel device uninitializer |
1da177e4 | 376 | * @dev: the device to be destroyed |
1ab1457c | 377 | * |
1da177e4 | 378 | * Description: |
3144581c | 379 | * ip6_tnl_dev_uninit() removes tunnel from its list |
1da177e4 LT |
380 | **/ |
381 | ||
382 | static void | |
3144581c | 383 | ip6_tnl_dev_uninit(struct net_device *dev) |
1da177e4 | 384 | { |
2941a486 | 385 | struct ip6_tnl *t = netdev_priv(dev); |
0bd87628 | 386 | struct net *net = t->net; |
2dd02c89 | 387 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 388 | |
94767632 | 389 | if (dev == ip6n->fb_tnl_dev) |
a9b3cd7f | 390 | RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL); |
94767632 | 391 | else |
2dd02c89 | 392 | ip6_tnl_unlink(ip6n, t); |
1da177e4 LT |
393 | ip6_tnl_dst_reset(t); |
394 | dev_put(dev); | |
395 | } | |
396 | ||
397 | /** | |
398 | * parse_tvl_tnl_enc_lim - handle encapsulation limit option | |
399 | * @skb: received socket buffer | |
400 | * | |
1ab1457c YH |
401 | * Return: |
402 | * 0 if none was found, | |
1da177e4 LT |
403 | * else index to encapsulation limit |
404 | **/ | |
405 | ||
c12b395a | 406 | __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw) |
1da177e4 | 407 | { |
b71d1d42 | 408 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw; |
1da177e4 LT |
409 | __u8 nexthdr = ipv6h->nexthdr; |
410 | __u16 off = sizeof (*ipv6h); | |
411 | ||
412 | while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { | |
413 | __u16 optlen = 0; | |
414 | struct ipv6_opt_hdr *hdr; | |
415 | if (raw + off + sizeof (*hdr) > skb->data && | |
416 | !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr))) | |
417 | break; | |
418 | ||
419 | hdr = (struct ipv6_opt_hdr *) (raw + off); | |
420 | if (nexthdr == NEXTHDR_FRAGMENT) { | |
421 | struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; | |
422 | if (frag_hdr->frag_off) | |
423 | break; | |
424 | optlen = 8; | |
425 | } else if (nexthdr == NEXTHDR_AUTH) { | |
426 | optlen = (hdr->hdrlen + 2) << 2; | |
427 | } else { | |
428 | optlen = ipv6_optlen(hdr); | |
429 | } | |
430 | if (nexthdr == NEXTHDR_DEST) { | |
431 | __u16 i = off + 2; | |
432 | while (1) { | |
433 | struct ipv6_tlv_tnl_enc_lim *tel; | |
434 | ||
435 | /* No more room for encapsulation limit */ | |
436 | if (i + sizeof (*tel) > off + optlen) | |
437 | break; | |
438 | ||
439 | tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i]; | |
440 | /* return index of option if found and valid */ | |
441 | if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && | |
442 | tel->length == 1) | |
443 | return i; | |
444 | /* else jump to next option */ | |
445 | if (tel->type) | |
446 | i += tel->length + 2; | |
447 | else | |
448 | i++; | |
449 | } | |
450 | } | |
451 | nexthdr = hdr->nexthdr; | |
452 | off += optlen; | |
453 | } | |
454 | return 0; | |
455 | } | |
c12b395a | 456 | EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim); |
1da177e4 LT |
457 | |
458 | /** | |
e490d1d8 | 459 | * ip6_tnl_err - tunnel error handler |
1da177e4 LT |
460 | * |
461 | * Description: | |
e490d1d8 | 462 | * ip6_tnl_err() should handle errors in the tunnel according |
1da177e4 LT |
463 | * to the specifications in RFC 2473. |
464 | **/ | |
465 | ||
d2acc347 | 466 | static int |
502b0935 | 467 | ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, |
d5fdd6ba | 468 | u8 *type, u8 *code, int *msg, __u32 *info, int offset) |
1da177e4 | 469 | { |
b71d1d42 | 470 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data; |
1da177e4 LT |
471 | struct ip6_tnl *t; |
472 | int rel_msg = 0; | |
d5fdd6ba BH |
473 | u8 rel_type = ICMPV6_DEST_UNREACH; |
474 | u8 rel_code = ICMPV6_ADDR_UNREACH; | |
1da177e4 LT |
475 | __u32 rel_info = 0; |
476 | __u16 len; | |
d2acc347 | 477 | int err = -ENOENT; |
1da177e4 | 478 | |
1ab1457c YH |
479 | /* If the packet doesn't contain the original IPv6 header we are |
480 | in trouble since we might need the source address for further | |
1da177e4 LT |
481 | processing of the error. */ |
482 | ||
2922bc8a | 483 | rcu_read_lock(); |
8704ca7e | 484 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, |
2dd02c89 | 485 | &ipv6h->saddr)) == NULL) |
1da177e4 LT |
486 | goto out; |
487 | ||
502b0935 YK |
488 | if (t->parms.proto != ipproto && t->parms.proto != 0) |
489 | goto out; | |
490 | ||
d2acc347 HX |
491 | err = 0; |
492 | ||
e490d1d8 | 493 | switch (*type) { |
1da177e4 LT |
494 | __u32 teli; |
495 | struct ipv6_tlv_tnl_enc_lim *tel; | |
496 | __u32 mtu; | |
497 | case ICMPV6_DEST_UNREACH: | |
e87cc472 JP |
498 | net_warn_ratelimited("%s: Path to destination invalid or inactive!\n", |
499 | t->parms.name); | |
1da177e4 LT |
500 | rel_msg = 1; |
501 | break; | |
502 | case ICMPV6_TIME_EXCEED: | |
e490d1d8 | 503 | if ((*code) == ICMPV6_EXC_HOPLIMIT) { |
e87cc472 JP |
504 | net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", |
505 | t->parms.name); | |
1da177e4 LT |
506 | rel_msg = 1; |
507 | } | |
508 | break; | |
509 | case ICMPV6_PARAMPROB: | |
107a5fe6 | 510 | teli = 0; |
e490d1d8 | 511 | if ((*code) == ICMPV6_HDR_FIELD) |
c12b395a | 512 | teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); |
1da177e4 | 513 | |
704eae1f | 514 | if (teli && teli == *info - 2) { |
1da177e4 LT |
515 | tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; |
516 | if (tel->encap_limit == 0) { | |
e87cc472 JP |
517 | net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", |
518 | t->parms.name); | |
1da177e4 LT |
519 | rel_msg = 1; |
520 | } | |
e87cc472 JP |
521 | } else { |
522 | net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n", | |
523 | t->parms.name); | |
1da177e4 LT |
524 | } |
525 | break; | |
526 | case ICMPV6_PKT_TOOBIG: | |
704eae1f | 527 | mtu = *info - offset; |
1da177e4 LT |
528 | if (mtu < IPV6_MIN_MTU) |
529 | mtu = IPV6_MIN_MTU; | |
530 | t->dev->mtu = mtu; | |
531 | ||
cc6cdac0 | 532 | if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) { |
1da177e4 LT |
533 | rel_type = ICMPV6_PKT_TOOBIG; |
534 | rel_code = 0; | |
535 | rel_info = mtu; | |
536 | rel_msg = 1; | |
537 | } | |
538 | break; | |
539 | } | |
e490d1d8 YK |
540 | |
541 | *type = rel_type; | |
542 | *code = rel_code; | |
543 | *info = rel_info; | |
544 | *msg = rel_msg; | |
545 | ||
546 | out: | |
2922bc8a | 547 | rcu_read_unlock(); |
e490d1d8 YK |
548 | return err; |
549 | } | |
550 | ||
c4d3efaf YK |
551 | static int |
552 | ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 553 | u8 type, u8 code, int offset, __be32 info) |
c4d3efaf YK |
554 | { |
555 | int rel_msg = 0; | |
d5fdd6ba BH |
556 | u8 rel_type = type; |
557 | u8 rel_code = code; | |
704eae1f | 558 | __u32 rel_info = ntohl(info); |
c4d3efaf YK |
559 | int err; |
560 | struct sk_buff *skb2; | |
b71d1d42 | 561 | const struct iphdr *eiph; |
c4d3efaf | 562 | struct rtable *rt; |
31e4543d | 563 | struct flowi4 fl4; |
c4d3efaf | 564 | |
502b0935 YK |
565 | err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, |
566 | &rel_msg, &rel_info, offset); | |
c4d3efaf YK |
567 | if (err < 0) |
568 | return err; | |
569 | ||
570 | if (rel_msg == 0) | |
571 | return 0; | |
572 | ||
573 | switch (rel_type) { | |
574 | case ICMPV6_DEST_UNREACH: | |
575 | if (rel_code != ICMPV6_ADDR_UNREACH) | |
576 | return 0; | |
577 | rel_type = ICMP_DEST_UNREACH; | |
578 | rel_code = ICMP_HOST_UNREACH; | |
579 | break; | |
580 | case ICMPV6_PKT_TOOBIG: | |
581 | if (rel_code != 0) | |
582 | return 0; | |
583 | rel_type = ICMP_DEST_UNREACH; | |
584 | rel_code = ICMP_FRAG_NEEDED; | |
585 | break; | |
ec18d9a2 DM |
586 | case NDISC_REDIRECT: |
587 | rel_type = ICMP_REDIRECT; | |
588 | rel_code = ICMP_REDIR_HOST; | |
c4d3efaf YK |
589 | default: |
590 | return 0; | |
591 | } | |
592 | ||
593 | if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) | |
594 | return 0; | |
595 | ||
596 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
597 | if (!skb2) | |
598 | return 0; | |
599 | ||
adf30907 ED |
600 | skb_dst_drop(skb2); |
601 | ||
c4d3efaf | 602 | skb_pull(skb2, offset); |
c1d2bbe1 | 603 | skb_reset_network_header(skb2); |
eddc9ec5 | 604 | eiph = ip_hdr(skb2); |
c4d3efaf YK |
605 | |
606 | /* Try to guess incoming interface */ | |
31e4543d | 607 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, |
78fbfd8a DM |
608 | eiph->saddr, 0, |
609 | 0, 0, | |
610 | IPPROTO_IPIP, RT_TOS(eiph->tos), 0); | |
b23dd4fe | 611 | if (IS_ERR(rt)) |
c4d3efaf YK |
612 | goto out; |
613 | ||
d8d1f30b | 614 | skb2->dev = rt->dst.dev; |
c4d3efaf YK |
615 | |
616 | /* route "incoming" packet */ | |
617 | if (rt->rt_flags & RTCF_LOCAL) { | |
618 | ip_rt_put(rt); | |
619 | rt = NULL; | |
31e4543d | 620 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, |
78fbfd8a DM |
621 | eiph->daddr, eiph->saddr, |
622 | 0, 0, | |
623 | IPPROTO_IPIP, | |
624 | RT_TOS(eiph->tos), 0); | |
b23dd4fe | 625 | if (IS_ERR(rt) || |
d8d1f30b | 626 | rt->dst.dev->type != ARPHRD_TUNNEL) { |
b23dd4fe DM |
627 | if (!IS_ERR(rt)) |
628 | ip_rt_put(rt); | |
c4d3efaf YK |
629 | goto out; |
630 | } | |
b23dd4fe | 631 | skb_dst_set(skb2, &rt->dst); |
c4d3efaf YK |
632 | } else { |
633 | ip_rt_put(rt); | |
634 | if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, | |
635 | skb2->dev) || | |
adf30907 | 636 | skb_dst(skb2)->dev->type != ARPHRD_TUNNEL) |
c4d3efaf YK |
637 | goto out; |
638 | } | |
639 | ||
640 | /* change mtu on this route */ | |
641 | if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { | |
adf30907 | 642 | if (rel_info > dst_mtu(skb_dst(skb2))) |
c4d3efaf YK |
643 | goto out; |
644 | ||
6700c270 | 645 | skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2, rel_info); |
c4d3efaf | 646 | } |
1ed5c48f | 647 | if (rel_type == ICMP_REDIRECT) |
6700c270 | 648 | skb_dst(skb2)->ops->redirect(skb_dst(skb2), NULL, skb2); |
c4d3efaf | 649 | |
704eae1f | 650 | icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); |
c4d3efaf YK |
651 | |
652 | out: | |
653 | kfree_skb(skb2); | |
654 | return 0; | |
655 | } | |
656 | ||
e490d1d8 YK |
657 | static int |
658 | ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 659 | u8 type, u8 code, int offset, __be32 info) |
e490d1d8 YK |
660 | { |
661 | int rel_msg = 0; | |
d5fdd6ba BH |
662 | u8 rel_type = type; |
663 | u8 rel_code = code; | |
704eae1f | 664 | __u32 rel_info = ntohl(info); |
e490d1d8 YK |
665 | int err; |
666 | ||
502b0935 YK |
667 | err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, |
668 | &rel_msg, &rel_info, offset); | |
e490d1d8 YK |
669 | if (err < 0) |
670 | return err; | |
671 | ||
672 | if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { | |
1da177e4 LT |
673 | struct rt6_info *rt; |
674 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
305d4b3c | 675 | |
1da177e4 | 676 | if (!skb2) |
e490d1d8 | 677 | return 0; |
1da177e4 | 678 | |
adf30907 | 679 | skb_dst_drop(skb2); |
1da177e4 | 680 | skb_pull(skb2, offset); |
c1d2bbe1 | 681 | skb_reset_network_header(skb2); |
1da177e4 LT |
682 | |
683 | /* Try to guess incoming interface */ | |
2f7f54b7 PE |
684 | rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, |
685 | NULL, 0, 0); | |
1da177e4 | 686 | |
d1918542 DM |
687 | if (rt && rt->dst.dev) |
688 | skb2->dev = rt->dst.dev; | |
1da177e4 | 689 | |
3ffe533c | 690 | icmpv6_send(skb2, rel_type, rel_code, rel_info); |
1da177e4 | 691 | |
94e187c0 | 692 | ip6_rt_put(rt); |
1da177e4 LT |
693 | |
694 | kfree_skb(skb2); | |
695 | } | |
e490d1d8 YK |
696 | |
697 | return 0; | |
1da177e4 LT |
698 | } |
699 | ||
f4e0b4c5 ND |
700 | static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
701 | const struct ipv6hdr *ipv6h, | |
702 | struct sk_buff *skb) | |
c4d3efaf YK |
703 | { |
704 | __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; | |
705 | ||
706 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) | |
eddc9ec5 | 707 | ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); |
c4d3efaf | 708 | |
f4e0b4c5 | 709 | return IP6_ECN_decapsulate(ipv6h, skb); |
c4d3efaf YK |
710 | } |
711 | ||
f4e0b4c5 ND |
712 | static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
713 | const struct ipv6hdr *ipv6h, | |
714 | struct sk_buff *skb) | |
1da177e4 | 715 | { |
8359925b | 716 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) |
29bb43b4 | 717 | ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); |
1da177e4 | 718 | |
f4e0b4c5 | 719 | return IP6_ECN_decapsulate(ipv6h, skb); |
1da177e4 | 720 | } |
8359925b | 721 | |
c12b395a | 722 | __u32 ip6_tnl_get_cap(struct ip6_tnl *t, |
d0087b29 VN |
723 | const struct in6_addr *laddr, |
724 | const struct in6_addr *raddr) | |
725 | { | |
c12b395a | 726 | struct __ip6_tnl_parm *p = &t->parms; |
d0087b29 VN |
727 | int ltype = ipv6_addr_type(laddr); |
728 | int rtype = ipv6_addr_type(raddr); | |
729 | __u32 flags = 0; | |
730 | ||
731 | if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) { | |
732 | flags = IP6_TNL_F_CAP_PER_PACKET; | |
733 | } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
734 | rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
735 | !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && | |
736 | (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { | |
737 | if (ltype&IPV6_ADDR_UNICAST) | |
738 | flags |= IP6_TNL_F_CAP_XMIT; | |
739 | if (rtype&IPV6_ADDR_UNICAST) | |
740 | flags |= IP6_TNL_F_CAP_RCV; | |
741 | } | |
742 | return flags; | |
743 | } | |
c12b395a | 744 | EXPORT_SYMBOL(ip6_tnl_get_cap); |
d0087b29 | 745 | |
f1a28eab | 746 | /* called with rcu_read_lock() */ |
c12b395a | 747 | int ip6_tnl_rcv_ctl(struct ip6_tnl *t, |
d0087b29 VN |
748 | const struct in6_addr *laddr, |
749 | const struct in6_addr *raddr) | |
09c6bbf0 | 750 | { |
c12b395a | 751 | struct __ip6_tnl_parm *p = &t->parms; |
09c6bbf0 | 752 | int ret = 0; |
0bd87628 | 753 | struct net *net = t->net; |
09c6bbf0 | 754 | |
d0087b29 VN |
755 | if ((p->flags & IP6_TNL_F_CAP_RCV) || |
756 | ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && | |
757 | (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) { | |
1ab1457c | 758 | struct net_device *ldev = NULL; |
09c6bbf0 VN |
759 | |
760 | if (p->link) | |
f1a28eab | 761 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 762 | |
d0087b29 VN |
763 | if ((ipv6_addr_is_multicast(laddr) || |
764 | likely(ipv6_chk_addr(net, laddr, ldev, 0))) && | |
765 | likely(!ipv6_chk_addr(net, raddr, NULL, 0))) | |
09c6bbf0 | 766 | ret = 1; |
09c6bbf0 VN |
767 | } |
768 | return ret; | |
769 | } | |
c12b395a | 770 | EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl); |
1da177e4 LT |
771 | |
772 | /** | |
3144581c | 773 | * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally |
1da177e4 | 774 | * @skb: received socket buffer |
8359925b YK |
775 | * @protocol: ethernet protocol ID |
776 | * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN | |
1da177e4 LT |
777 | * |
778 | * Return: 0 | |
779 | **/ | |
780 | ||
8359925b | 781 | static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol, |
502b0935 | 782 | __u8 ipproto, |
f4e0b4c5 ND |
783 | int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, |
784 | const struct ipv6hdr *ipv6h, | |
785 | struct sk_buff *skb)) | |
1da177e4 | 786 | { |
1da177e4 | 787 | struct ip6_tnl *t; |
b71d1d42 | 788 | const struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
f4e0b4c5 | 789 | int err; |
1da177e4 | 790 | |
2922bc8a | 791 | rcu_read_lock(); |
1da177e4 | 792 | |
8704ca7e | 793 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, |
2dd02c89 | 794 | &ipv6h->daddr)) != NULL) { |
8f84985f | 795 | struct pcpu_sw_netstats *tstats; |
8560f226 | 796 | |
502b0935 | 797 | if (t->parms.proto != ipproto && t->parms.proto != 0) { |
2922bc8a | 798 | rcu_read_unlock(); |
502b0935 YK |
799 | goto discard; |
800 | } | |
801 | ||
1da177e4 | 802 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
2922bc8a | 803 | rcu_read_unlock(); |
50fba2aa | 804 | goto discard; |
1da177e4 LT |
805 | } |
806 | ||
d0087b29 | 807 | if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) { |
3dca02af | 808 | t->dev->stats.rx_dropped++; |
2922bc8a | 809 | rcu_read_unlock(); |
1da177e4 LT |
810 | goto discard; |
811 | } | |
b0e380b1 | 812 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 813 | skb_reset_network_header(skb); |
8359925b | 814 | skb->protocol = htons(protocol); |
1da177e4 | 815 | memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); |
8359925b | 816 | |
ea23192e | 817 | __skb_tunnel_rx(skb, t->dev, t->net); |
f4e0b4c5 ND |
818 | |
819 | err = dscp_ecn_decapsulate(t, ipv6h, skb); | |
820 | if (unlikely(err)) { | |
821 | if (log_ecn_error) | |
822 | net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n", | |
823 | &ipv6h->saddr, | |
824 | ipv6_get_dsfield(ipv6h)); | |
825 | if (err > 1) { | |
826 | ++t->dev->stats.rx_frame_errors; | |
827 | ++t->dev->stats.rx_errors; | |
828 | rcu_read_unlock(); | |
829 | goto discard; | |
830 | } | |
831 | } | |
832 | ||
8560f226 | 833 | tstats = this_cpu_ptr(t->dev->tstats); |
abb6013c | 834 | u64_stats_update_begin(&tstats->syncp); |
8560f226 ED |
835 | tstats->rx_packets++; |
836 | tstats->rx_bytes += skb->len; | |
abb6013c | 837 | u64_stats_update_end(&tstats->syncp); |
8560f226 | 838 | |
caf586e5 | 839 | netif_rx(skb); |
8990f468 | 840 | |
2922bc8a | 841 | rcu_read_unlock(); |
1da177e4 LT |
842 | return 0; |
843 | } | |
2922bc8a | 844 | rcu_read_unlock(); |
1da177e4 | 845 | return 1; |
50fba2aa HX |
846 | |
847 | discard: | |
848 | kfree_skb(skb); | |
849 | return 0; | |
1da177e4 LT |
850 | } |
851 | ||
c4d3efaf YK |
852 | static int ip4ip6_rcv(struct sk_buff *skb) |
853 | { | |
502b0935 YK |
854 | return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP, |
855 | ip4ip6_dscp_ecn_decapsulate); | |
c4d3efaf YK |
856 | } |
857 | ||
8359925b YK |
858 | static int ip6ip6_rcv(struct sk_buff *skb) |
859 | { | |
502b0935 YK |
860 | return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6, |
861 | ip6ip6_dscp_ecn_decapsulate); | |
8359925b YK |
862 | } |
863 | ||
6fb32dde VN |
864 | struct ipv6_tel_txoption { |
865 | struct ipv6_txoptions ops; | |
866 | __u8 dst_opt[8]; | |
867 | }; | |
1da177e4 | 868 | |
6fb32dde VN |
869 | static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) |
870 | { | |
871 | memset(opt, 0, sizeof(struct ipv6_tel_txoption)); | |
1da177e4 | 872 | |
6fb32dde VN |
873 | opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; |
874 | opt->dst_opt[3] = 1; | |
875 | opt->dst_opt[4] = encap_limit; | |
876 | opt->dst_opt[5] = IPV6_TLV_PADN; | |
877 | opt->dst_opt[6] = 1; | |
1da177e4 | 878 | |
6fb32dde VN |
879 | opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; |
880 | opt->ops.opt_nflen = 8; | |
1da177e4 LT |
881 | } |
882 | ||
883 | /** | |
3144581c | 884 | * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own |
1da177e4 | 885 | * @t: the outgoing tunnel device |
1ab1457c | 886 | * @hdr: IPv6 header from the incoming packet |
1da177e4 LT |
887 | * |
888 | * Description: | |
1ab1457c | 889 | * Avoid trivial tunneling loop by checking that tunnel exit-point |
1da177e4 LT |
890 | * doesn't match source of incoming packet. |
891 | * | |
1ab1457c | 892 | * Return: |
1da177e4 LT |
893 | * 1 if conflict, |
894 | * 0 else | |
895 | **/ | |
896 | ||
92113bfd | 897 | static inline bool |
b71d1d42 | 898 | ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) |
1da177e4 LT |
899 | { |
900 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
901 | } | |
902 | ||
c12b395a | 903 | int ip6_tnl_xmit_ctl(struct ip6_tnl *t) |
09c6bbf0 | 904 | { |
c12b395a | 905 | struct __ip6_tnl_parm *p = &t->parms; |
09c6bbf0 | 906 | int ret = 0; |
0bd87628 | 907 | struct net *net = t->net; |
09c6bbf0 | 908 | |
1ab1457c | 909 | if (p->flags & IP6_TNL_F_CAP_XMIT) { |
09c6bbf0 VN |
910 | struct net_device *ldev = NULL; |
911 | ||
f1a28eab | 912 | rcu_read_lock(); |
09c6bbf0 | 913 | if (p->link) |
f1a28eab | 914 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 915 | |
2f7f54b7 | 916 | if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0))) |
f3213831 JP |
917 | pr_warn("%s xmit: Local address not yet configured!\n", |
918 | p->name); | |
09c6bbf0 | 919 | else if (!ipv6_addr_is_multicast(&p->raddr) && |
2f7f54b7 | 920 | unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0))) |
f3213831 JP |
921 | pr_warn("%s xmit: Routing loop! Remote address found on this node!\n", |
922 | p->name); | |
09c6bbf0 VN |
923 | else |
924 | ret = 1; | |
f1a28eab | 925 | rcu_read_unlock(); |
09c6bbf0 VN |
926 | } |
927 | return ret; | |
928 | } | |
c12b395a | 929 | EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl); |
930 | ||
1da177e4 | 931 | /** |
61ec2aec | 932 | * ip6_tnl_xmit2 - encapsulate packet and send |
1da177e4 | 933 | * @skb: the outgoing socket buffer |
1ab1457c | 934 | * @dev: the outgoing tunnel device |
61ec2aec YK |
935 | * @dsfield: dscp code for outer header |
936 | * @fl: flow of tunneled packet | |
937 | * @encap_limit: encapsulation limit | |
938 | * @pmtu: Path MTU is stored if packet is too big | |
1da177e4 LT |
939 | * |
940 | * Description: | |
941 | * Build new header and do some sanity checks on the packet before sending | |
942 | * it. | |
943 | * | |
1ab1457c | 944 | * Return: |
c4d3efaf | 945 | * 0 on success |
61ec2aec YK |
946 | * -1 fail |
947 | * %-EMSGSIZE message too big. return mtu in this case. | |
1da177e4 LT |
948 | **/ |
949 | ||
61ec2aec YK |
950 | static int ip6_tnl_xmit2(struct sk_buff *skb, |
951 | struct net_device *dev, | |
952 | __u8 dsfield, | |
4c9483b2 | 953 | struct flowi6 *fl6, |
61ec2aec YK |
954 | int encap_limit, |
955 | __u32 *pmtu) | |
1da177e4 | 956 | { |
2941a486 | 957 | struct ip6_tnl *t = netdev_priv(dev); |
0bd87628 | 958 | struct net *net = t->net; |
3dca02af | 959 | struct net_device_stats *stats = &t->dev->stats; |
0660e03f | 960 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
6fb32dde | 961 | struct ipv6_tel_txoption opt; |
d24f22f3 | 962 | struct dst_entry *dst = NULL, *ndst = NULL; |
1da177e4 LT |
963 | struct net_device *tdev; |
964 | int mtu; | |
c2636b4d | 965 | unsigned int max_headroom = sizeof(struct ipv6hdr); |
1da177e4 | 966 | u8 proto; |
61ec2aec | 967 | int err = -1; |
1da177e4 | 968 | |
d24f22f3 ED |
969 | if (!fl6->flowi6_mark) |
970 | dst = ip6_tnl_dst_check(t); | |
89b02126 ED |
971 | if (!dst) { |
972 | ndst = ip6_route_output(net, NULL, fl6); | |
1da177e4 | 973 | |
89b02126 | 974 | if (ndst->error) |
a57ebc90 | 975 | goto tx_err_link_failure; |
89b02126 ED |
976 | ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0); |
977 | if (IS_ERR(ndst)) { | |
978 | err = PTR_ERR(ndst); | |
979 | ndst = NULL; | |
452edd59 DM |
980 | goto tx_err_link_failure; |
981 | } | |
89b02126 | 982 | dst = ndst; |
a57ebc90 | 983 | } |
1da177e4 LT |
984 | |
985 | tdev = dst->dev; | |
986 | ||
987 | if (tdev == dev) { | |
988 | stats->collisions++; | |
e87cc472 JP |
989 | net_warn_ratelimited("%s: Local routing loop detected!\n", |
990 | t->parms.name); | |
1da177e4 LT |
991 | goto tx_err_dst_release; |
992 | } | |
993 | mtu = dst_mtu(dst) - sizeof (*ipv6h); | |
6fb32dde | 994 | if (encap_limit >= 0) { |
1da177e4 LT |
995 | max_headroom += 8; |
996 | mtu -= 8; | |
997 | } | |
998 | if (mtu < IPV6_MIN_MTU) | |
999 | mtu = IPV6_MIN_MTU; | |
adf30907 | 1000 | if (skb_dst(skb)) |
6700c270 | 1001 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); |
1da177e4 | 1002 | if (skb->len > mtu) { |
61ec2aec YK |
1003 | *pmtu = mtu; |
1004 | err = -EMSGSIZE; | |
1da177e4 LT |
1005 | goto tx_err_dst_release; |
1006 | } | |
1007 | ||
963a88b3 | 1008 | skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev))); |
0bd87628 | 1009 | |
1da177e4 LT |
1010 | /* |
1011 | * Okay, now see if we can stuff it in the buffer as-is. | |
1012 | */ | |
1013 | max_headroom += LL_RESERVED_SPACE(tdev); | |
1ab1457c | 1014 | |
cfbba49d PM |
1015 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
1016 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 | 1017 | struct sk_buff *new_skb; |
1ab1457c | 1018 | |
1da177e4 LT |
1019 | if (!(new_skb = skb_realloc_headroom(skb, max_headroom))) |
1020 | goto tx_err_dst_release; | |
1021 | ||
1022 | if (skb->sk) | |
1023 | skb_set_owner_w(new_skb, skb->sk); | |
9ff26449 | 1024 | consume_skb(skb); |
1da177e4 LT |
1025 | skb = new_skb; |
1026 | } | |
d24f22f3 ED |
1027 | if (fl6->flowi6_mark) { |
1028 | skb_dst_set(skb, dst); | |
1029 | ndst = NULL; | |
1030 | } else { | |
1031 | skb_dst_set_noref(skb, dst); | |
1032 | } | |
b0e380b1 | 1033 | skb->transport_header = skb->network_header; |
1da177e4 | 1034 | |
4c9483b2 | 1035 | proto = fl6->flowi6_proto; |
6fb32dde VN |
1036 | if (encap_limit >= 0) { |
1037 | init_tel_txopt(&opt, encap_limit); | |
1038 | ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); | |
1039 | } | |
3d483058 HFS |
1040 | |
1041 | if (likely(!skb->encapsulation)) { | |
1042 | skb_reset_inner_headers(skb); | |
1043 | skb->encapsulation = 1; | |
1044 | } | |
1045 | ||
e2d1bca7 ACM |
1046 | skb_push(skb, sizeof(struct ipv6hdr)); |
1047 | skb_reset_network_header(skb); | |
0660e03f | 1048 | ipv6h = ipv6_hdr(skb); |
3e4e4c1f | 1049 | ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), fl6->flowlabel); |
1da177e4 LT |
1050 | ipv6h->hop_limit = t->parms.hop_limit; |
1051 | ipv6h->nexthdr = proto; | |
4e3fd7a0 AD |
1052 | ipv6h->saddr = fl6->saddr; |
1053 | ipv6h->daddr = fl6->daddr; | |
e8f72ea4 | 1054 | ip6tunnel_xmit(skb, dev); |
89b02126 ED |
1055 | if (ndst) |
1056 | ip6_tnl_dst_store(t, ndst); | |
1da177e4 LT |
1057 | return 0; |
1058 | tx_err_link_failure: | |
1059 | stats->tx_carrier_errors++; | |
1060 | dst_link_failure(skb); | |
1061 | tx_err_dst_release: | |
89b02126 | 1062 | dst_release(ndst); |
61ec2aec YK |
1063 | return err; |
1064 | } | |
1065 | ||
c4d3efaf YK |
1066 | static inline int |
1067 | ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1068 | { | |
1069 | struct ip6_tnl *t = netdev_priv(dev); | |
b71d1d42 | 1070 | const struct iphdr *iph = ip_hdr(skb); |
c4d3efaf | 1071 | int encap_limit = -1; |
4c9483b2 | 1072 | struct flowi6 fl6; |
c4d3efaf YK |
1073 | __u8 dsfield; |
1074 | __u32 mtu; | |
1075 | int err; | |
1076 | ||
502b0935 YK |
1077 | if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) || |
1078 | !ip6_tnl_xmit_ctl(t)) | |
c4d3efaf YK |
1079 | return -1; |
1080 | ||
1081 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1082 | encap_limit = t->parms.encap_limit; | |
1083 | ||
4c9483b2 DM |
1084 | memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6)); |
1085 | fl6.flowi6_proto = IPPROTO_IPIP; | |
c4d3efaf YK |
1086 | |
1087 | dsfield = ipv4_get_dsfield(iph); | |
1088 | ||
d24f22f3 | 1089 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
4c9483b2 | 1090 | fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) |
b77f2fa6 | 1091 | & IPV6_TCLASS_MASK; |
d24f22f3 ED |
1092 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
1093 | fl6.flowi6_mark = skb->mark; | |
c4d3efaf | 1094 | |
4c9483b2 | 1095 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); |
c4d3efaf YK |
1096 | if (err != 0) { |
1097 | /* XXX: send ICMP error even if DF is not set. */ | |
1098 | if (err == -EMSGSIZE) | |
1099 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
1100 | htonl(mtu)); | |
1101 | return -1; | |
1102 | } | |
1103 | ||
1104 | return 0; | |
1105 | } | |
1106 | ||
61ec2aec YK |
1107 | static inline int |
1108 | ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1109 | { | |
1110 | struct ip6_tnl *t = netdev_priv(dev); | |
0660e03f | 1111 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
61ec2aec YK |
1112 | int encap_limit = -1; |
1113 | __u16 offset; | |
4c9483b2 | 1114 | struct flowi6 fl6; |
61ec2aec YK |
1115 | __u8 dsfield; |
1116 | __u32 mtu; | |
1117 | int err; | |
1118 | ||
502b0935 YK |
1119 | if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) || |
1120 | !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h)) | |
61ec2aec YK |
1121 | return -1; |
1122 | ||
c12b395a | 1123 | offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); |
d56f90a7 | 1124 | if (offset > 0) { |
61ec2aec | 1125 | struct ipv6_tlv_tnl_enc_lim *tel; |
d56f90a7 | 1126 | tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; |
61ec2aec YK |
1127 | if (tel->encap_limit == 0) { |
1128 | icmpv6_send(skb, ICMPV6_PARAMPROB, | |
3ffe533c | 1129 | ICMPV6_HDR_FIELD, offset + 2); |
61ec2aec YK |
1130 | return -1; |
1131 | } | |
1132 | encap_limit = tel->encap_limit - 1; | |
1133 | } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1134 | encap_limit = t->parms.encap_limit; | |
1135 | ||
4c9483b2 DM |
1136 | memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6)); |
1137 | fl6.flowi6_proto = IPPROTO_IPV6; | |
61ec2aec YK |
1138 | |
1139 | dsfield = ipv6_get_dsfield(ipv6h); | |
d24f22f3 | 1140 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
4c9483b2 | 1141 | fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); |
d24f22f3 | 1142 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) |
3308de2b | 1143 | fl6.flowlabel |= ip6_flowlabel(ipv6h); |
d24f22f3 ED |
1144 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
1145 | fl6.flowi6_mark = skb->mark; | |
61ec2aec | 1146 | |
4c9483b2 | 1147 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); |
61ec2aec YK |
1148 | if (err != 0) { |
1149 | if (err == -EMSGSIZE) | |
3ffe533c | 1150 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
61ec2aec YK |
1151 | return -1; |
1152 | } | |
1153 | ||
1154 | return 0; | |
1155 | } | |
1156 | ||
6fef4c0c | 1157 | static netdev_tx_t |
61ec2aec YK |
1158 | ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) |
1159 | { | |
1160 | struct ip6_tnl *t = netdev_priv(dev); | |
3dca02af | 1161 | struct net_device_stats *stats = &t->dev->stats; |
61ec2aec YK |
1162 | int ret; |
1163 | ||
61ec2aec | 1164 | switch (skb->protocol) { |
60678040 | 1165 | case htons(ETH_P_IP): |
c4d3efaf YK |
1166 | ret = ip4ip6_tnl_xmit(skb, dev); |
1167 | break; | |
60678040 | 1168 | case htons(ETH_P_IPV6): |
61ec2aec YK |
1169 | ret = ip6ip6_tnl_xmit(skb, dev); |
1170 | break; | |
1171 | default: | |
1172 | goto tx_err; | |
1173 | } | |
1174 | ||
1175 | if (ret < 0) | |
1176 | goto tx_err; | |
1177 | ||
6ed10654 | 1178 | return NETDEV_TX_OK; |
61ec2aec | 1179 | |
1da177e4 LT |
1180 | tx_err: |
1181 | stats->tx_errors++; | |
1182 | stats->tx_dropped++; | |
1183 | kfree_skb(skb); | |
6ed10654 | 1184 | return NETDEV_TX_OK; |
1da177e4 LT |
1185 | } |
1186 | ||
3144581c | 1187 | static void ip6_tnl_link_config(struct ip6_tnl *t) |
1da177e4 LT |
1188 | { |
1189 | struct net_device *dev = t->dev; | |
c12b395a | 1190 | struct __ip6_tnl_parm *p = &t->parms; |
4c9483b2 | 1191 | struct flowi6 *fl6 = &t->fl.u.ip6; |
1da177e4 | 1192 | |
3a6d54c5 JP |
1193 | memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); |
1194 | memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
1da177e4 LT |
1195 | |
1196 | /* Set up flowi template */ | |
4e3fd7a0 AD |
1197 | fl6->saddr = p->laddr; |
1198 | fl6->daddr = p->raddr; | |
4c9483b2 DM |
1199 | fl6->flowi6_oif = p->link; |
1200 | fl6->flowlabel = 0; | |
1da177e4 LT |
1201 | |
1202 | if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) | |
4c9483b2 | 1203 | fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; |
1da177e4 | 1204 | if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) |
4c9483b2 | 1205 | fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; |
1da177e4 | 1206 | |
d0087b29 VN |
1207 | p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); |
1208 | p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); | |
1da177e4 LT |
1209 | |
1210 | if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) | |
1211 | dev->flags |= IFF_POINTOPOINT; | |
1212 | else | |
1213 | dev->flags &= ~IFF_POINTOPOINT; | |
1214 | ||
1215 | dev->iflink = p->link; | |
1216 | ||
1217 | if (p->flags & IP6_TNL_F_CAP_XMIT) { | |
305d4b3c VN |
1218 | int strict = (ipv6_addr_type(&p->raddr) & |
1219 | (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); | |
1220 | ||
0bd87628 | 1221 | struct rt6_info *rt = rt6_lookup(t->net, |
2f7f54b7 | 1222 | &p->raddr, &p->laddr, |
305d4b3c | 1223 | p->link, strict); |
1da177e4 LT |
1224 | |
1225 | if (rt == NULL) | |
1226 | return; | |
1227 | ||
d1918542 DM |
1228 | if (rt->dst.dev) { |
1229 | dev->hard_header_len = rt->dst.dev->hard_header_len + | |
1da177e4 LT |
1230 | sizeof (struct ipv6hdr); |
1231 | ||
d1918542 | 1232 | dev->mtu = rt->dst.dev->mtu - sizeof (struct ipv6hdr); |
381601e5 AF |
1233 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
1234 | dev->mtu-=8; | |
1da177e4 LT |
1235 | |
1236 | if (dev->mtu < IPV6_MIN_MTU) | |
1237 | dev->mtu = IPV6_MIN_MTU; | |
1238 | } | |
94e187c0 | 1239 | ip6_rt_put(rt); |
1da177e4 LT |
1240 | } |
1241 | } | |
1242 | ||
1243 | /** | |
3144581c | 1244 | * ip6_tnl_change - update the tunnel parameters |
1da177e4 LT |
1245 | * @t: tunnel to be changed |
1246 | * @p: tunnel configuration parameters | |
1da177e4 LT |
1247 | * |
1248 | * Description: | |
3144581c | 1249 | * ip6_tnl_change() updates the tunnel parameters |
1da177e4 LT |
1250 | **/ |
1251 | ||
1252 | static int | |
c12b395a | 1253 | ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) |
1da177e4 | 1254 | { |
4e3fd7a0 AD |
1255 | t->parms.laddr = p->laddr; |
1256 | t->parms.raddr = p->raddr; | |
1da177e4 LT |
1257 | t->parms.flags = p->flags; |
1258 | t->parms.hop_limit = p->hop_limit; | |
1259 | t->parms.encap_limit = p->encap_limit; | |
1260 | t->parms.flowinfo = p->flowinfo; | |
8181b8c1 | 1261 | t->parms.link = p->link; |
502b0935 | 1262 | t->parms.proto = p->proto; |
0c088890 | 1263 | ip6_tnl_dst_reset(t); |
3144581c | 1264 | ip6_tnl_link_config(t); |
1da177e4 LT |
1265 | return 0; |
1266 | } | |
1267 | ||
0b112457 ND |
1268 | static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) |
1269 | { | |
0bd87628 | 1270 | struct net *net = t->net; |
0b112457 ND |
1271 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1272 | int err; | |
1273 | ||
1274 | ip6_tnl_unlink(ip6n, t); | |
1275 | synchronize_net(); | |
1276 | err = ip6_tnl_change(t, p); | |
1277 | ip6_tnl_link(ip6n, t); | |
1278 | netdev_state_change(t->dev); | |
1279 | return err; | |
1280 | } | |
1281 | ||
c12b395a | 1282 | static void |
1283 | ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u) | |
1284 | { | |
1285 | p->laddr = u->laddr; | |
1286 | p->raddr = u->raddr; | |
1287 | p->flags = u->flags; | |
1288 | p->hop_limit = u->hop_limit; | |
1289 | p->encap_limit = u->encap_limit; | |
1290 | p->flowinfo = u->flowinfo; | |
1291 | p->link = u->link; | |
1292 | p->proto = u->proto; | |
1293 | memcpy(p->name, u->name, sizeof(u->name)); | |
1294 | } | |
1295 | ||
1296 | static void | |
1297 | ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p) | |
1298 | { | |
1299 | u->laddr = p->laddr; | |
1300 | u->raddr = p->raddr; | |
1301 | u->flags = p->flags; | |
1302 | u->hop_limit = p->hop_limit; | |
1303 | u->encap_limit = p->encap_limit; | |
1304 | u->flowinfo = p->flowinfo; | |
1305 | u->link = p->link; | |
1306 | u->proto = p->proto; | |
1307 | memcpy(u->name, p->name, sizeof(u->name)); | |
1308 | } | |
1309 | ||
1da177e4 | 1310 | /** |
3144581c | 1311 | * ip6_tnl_ioctl - configure ipv6 tunnels from userspace |
1da177e4 LT |
1312 | * @dev: virtual device associated with tunnel |
1313 | * @ifr: parameters passed from userspace | |
1314 | * @cmd: command to be performed | |
1315 | * | |
1316 | * Description: | |
3144581c | 1317 | * ip6_tnl_ioctl() is used for managing IPv6 tunnels |
1ab1457c | 1318 | * from userspace. |
1da177e4 LT |
1319 | * |
1320 | * The possible commands are the following: | |
1321 | * %SIOCGETTUNNEL: get tunnel parameters for device | |
1322 | * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters | |
1323 | * %SIOCCHGTUNNEL: change tunnel parameters to those given | |
1324 | * %SIOCDELTUNNEL: delete tunnel | |
1325 | * | |
1ab1457c | 1326 | * The fallback device "ip6tnl0", created during module |
1da177e4 LT |
1327 | * initialization, can be used for creating other tunnel devices. |
1328 | * | |
1329 | * Return: | |
1330 | * 0 on success, | |
1331 | * %-EFAULT if unable to copy data to or from userspace, | |
1332 | * %-EPERM if current process hasn't %CAP_NET_ADMIN set | |
1333 | * %-EINVAL if passed tunnel parameters are invalid, | |
1334 | * %-EEXIST if changing a tunnel's parameters would cause a conflict | |
1335 | * %-ENODEV if attempting to change or delete a nonexisting device | |
1336 | **/ | |
1337 | ||
1338 | static int | |
3144581c | 1339 | ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
1da177e4 LT |
1340 | { |
1341 | int err = 0; | |
1da177e4 | 1342 | struct ip6_tnl_parm p; |
c12b395a | 1343 | struct __ip6_tnl_parm p1; |
74462f0d ND |
1344 | struct ip6_tnl *t = netdev_priv(dev); |
1345 | struct net *net = t->net; | |
2dd02c89 | 1346 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 LT |
1347 | |
1348 | switch (cmd) { | |
1349 | case SIOCGETTUNNEL: | |
15820e12 | 1350 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 | 1351 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) { |
1da177e4 LT |
1352 | err = -EFAULT; |
1353 | break; | |
1354 | } | |
c12b395a | 1355 | ip6_tnl_parm_from_user(&p1, &p); |
1356 | t = ip6_tnl_locate(net, &p1, 0); | |
74462f0d ND |
1357 | if (t == NULL) |
1358 | t = netdev_priv(dev); | |
5ef5d6c5 DC |
1359 | } else { |
1360 | memset(&p, 0, sizeof(p)); | |
567131a7 | 1361 | } |
c12b395a | 1362 | ip6_tnl_parm_to_user(&p, &t->parms); |
1da177e4 LT |
1363 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) { |
1364 | err = -EFAULT; | |
1365 | } | |
1366 | break; | |
1367 | case SIOCADDTUNNEL: | |
1368 | case SIOCCHGTUNNEL: | |
1369 | err = -EPERM; | |
af31f412 | 1370 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 1371 | break; |
567131a7 VN |
1372 | err = -EFAULT; |
1373 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1374 | break; |
567131a7 | 1375 | err = -EINVAL; |
502b0935 YK |
1376 | if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && |
1377 | p.proto != 0) | |
1da177e4 | 1378 | break; |
c12b395a | 1379 | ip6_tnl_parm_from_user(&p1, &p); |
1380 | t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL); | |
15820e12 | 1381 | if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) { |
567131a7 VN |
1382 | if (t != NULL) { |
1383 | if (t->dev != dev) { | |
1384 | err = -EEXIST; | |
1385 | break; | |
1386 | } | |
1387 | } else | |
1388 | t = netdev_priv(dev); | |
1389 | ||
0b112457 | 1390 | err = ip6_tnl_update(t, &p1); |
1da177e4 | 1391 | } |
567131a7 | 1392 | if (t) { |
1da177e4 | 1393 | err = 0; |
c12b395a | 1394 | ip6_tnl_parm_to_user(&p, &t->parms); |
1395 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
567131a7 VN |
1396 | err = -EFAULT; |
1397 | ||
1398 | } else | |
1399 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1da177e4 LT |
1400 | break; |
1401 | case SIOCDELTUNNEL: | |
1402 | err = -EPERM; | |
af31f412 | 1403 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1404 | break; |
1405 | ||
15820e12 | 1406 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 VN |
1407 | err = -EFAULT; |
1408 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1409 | break; |
567131a7 | 1410 | err = -ENOENT; |
c12b395a | 1411 | ip6_tnl_parm_from_user(&p1, &p); |
1412 | t = ip6_tnl_locate(net, &p1, 0); | |
1413 | if (t == NULL) | |
1da177e4 | 1414 | break; |
567131a7 | 1415 | err = -EPERM; |
15820e12 | 1416 | if (t->dev == ip6n->fb_tnl_dev) |
1da177e4 | 1417 | break; |
567131a7 | 1418 | dev = t->dev; |
1da177e4 | 1419 | } |
22f8cde5 SH |
1420 | err = 0; |
1421 | unregister_netdevice(dev); | |
1da177e4 LT |
1422 | break; |
1423 | default: | |
1424 | err = -EINVAL; | |
1425 | } | |
1426 | return err; | |
1427 | } | |
1428 | ||
1da177e4 | 1429 | /** |
3144581c | 1430 | * ip6_tnl_change_mtu - change mtu manually for tunnel device |
1da177e4 LT |
1431 | * @dev: virtual device associated with tunnel |
1432 | * @new_mtu: the new mtu | |
1433 | * | |
1434 | * Return: | |
1435 | * 0 on success, | |
1436 | * %-EINVAL if mtu too small | |
1437 | **/ | |
1438 | ||
1439 | static int | |
3144581c | 1440 | ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) |
1da177e4 | 1441 | { |
582442d6 OG |
1442 | struct ip6_tnl *tnl = netdev_priv(dev); |
1443 | ||
1444 | if (tnl->parms.proto == IPPROTO_IPIP) { | |
1445 | if (new_mtu < 68) | |
1446 | return -EINVAL; | |
1447 | } else { | |
1448 | if (new_mtu < IPV6_MIN_MTU) | |
1449 | return -EINVAL; | |
1da177e4 | 1450 | } |
582442d6 OG |
1451 | if (new_mtu > 0xFFF8 - dev->hard_header_len) |
1452 | return -EINVAL; | |
1da177e4 LT |
1453 | dev->mtu = new_mtu; |
1454 | return 0; | |
1455 | } | |
1456 | ||
1326c3d5 SH |
1457 | |
1458 | static const struct net_device_ops ip6_tnl_netdev_ops = { | |
8560f226 | 1459 | .ndo_uninit = ip6_tnl_dev_uninit, |
1326c3d5 | 1460 | .ndo_start_xmit = ip6_tnl_xmit, |
8560f226 | 1461 | .ndo_do_ioctl = ip6_tnl_ioctl, |
1326c3d5 | 1462 | .ndo_change_mtu = ip6_tnl_change_mtu, |
8560f226 | 1463 | .ndo_get_stats = ip6_get_stats, |
1326c3d5 SH |
1464 | }; |
1465 | ||
8560f226 | 1466 | |
1da177e4 | 1467 | /** |
3144581c | 1468 | * ip6_tnl_dev_setup - setup virtual tunnel device |
1da177e4 LT |
1469 | * @dev: virtual device associated with tunnel |
1470 | * | |
1471 | * Description: | |
1472 | * Initialize function pointers and device parameters | |
1473 | **/ | |
1474 | ||
3144581c | 1475 | static void ip6_tnl_dev_setup(struct net_device *dev) |
1da177e4 | 1476 | { |
381601e5 AF |
1477 | struct ip6_tnl *t; |
1478 | ||
1326c3d5 | 1479 | dev->netdev_ops = &ip6_tnl_netdev_ops; |
8560f226 | 1480 | dev->destructor = ip6_dev_free; |
1da177e4 LT |
1481 | |
1482 | dev->type = ARPHRD_TUNNEL6; | |
1483 | dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr); | |
1484 | dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr); | |
381601e5 AF |
1485 | t = netdev_priv(dev); |
1486 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1487 | dev->mtu-=8; | |
1da177e4 LT |
1488 | dev->flags |= IFF_NOARP; |
1489 | dev->addr_len = sizeof(struct in6_addr); | |
7e223de8 | 1490 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
e837735e ND |
1491 | /* This perm addr will be used as interface identifier by IPv6 */ |
1492 | dev->addr_assign_type = NET_ADDR_RANDOM; | |
1493 | eth_random_addr(dev->perm_addr); | |
1da177e4 LT |
1494 | } |
1495 | ||
1496 | ||
1497 | /** | |
3144581c | 1498 | * ip6_tnl_dev_init_gen - general initializer for all tunnel devices |
1da177e4 LT |
1499 | * @dev: virtual device associated with tunnel |
1500 | **/ | |
1501 | ||
8560f226 | 1502 | static inline int |
3144581c | 1503 | ip6_tnl_dev_init_gen(struct net_device *dev) |
1da177e4 | 1504 | { |
2941a486 | 1505 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 | 1506 | |
1da177e4 | 1507 | t->dev = dev; |
0bd87628 | 1508 | t->net = dev_net(dev); |
1c213bd2 | 1509 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
8560f226 ED |
1510 | if (!dev->tstats) |
1511 | return -ENOMEM; | |
1512 | return 0; | |
1da177e4 LT |
1513 | } |
1514 | ||
1515 | /** | |
3144581c | 1516 | * ip6_tnl_dev_init - initializer for all non fallback tunnel devices |
1da177e4 LT |
1517 | * @dev: virtual device associated with tunnel |
1518 | **/ | |
1519 | ||
8560f226 | 1520 | static int ip6_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1521 | { |
2941a486 | 1522 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 ED |
1523 | int err = ip6_tnl_dev_init_gen(dev); |
1524 | ||
1525 | if (err) | |
1526 | return err; | |
3144581c | 1527 | ip6_tnl_link_config(t); |
8560f226 | 1528 | return 0; |
1da177e4 LT |
1529 | } |
1530 | ||
1531 | /** | |
3144581c | 1532 | * ip6_fb_tnl_dev_init - initializer for fallback tunnel device |
1da177e4 LT |
1533 | * @dev: fallback device |
1534 | * | |
1535 | * Return: 0 | |
1536 | **/ | |
1537 | ||
8560f226 | 1538 | static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1539 | { |
2941a486 | 1540 | struct ip6_tnl *t = netdev_priv(dev); |
3e6c9fb5 PE |
1541 | struct net *net = dev_net(dev); |
1542 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
8560f226 ED |
1543 | int err = ip6_tnl_dev_init_gen(dev); |
1544 | ||
1545 | if (err) | |
1546 | return err; | |
3e6c9fb5 | 1547 | |
502b0935 | 1548 | t->parms.proto = IPPROTO_IPV6; |
1da177e4 | 1549 | dev_hold(dev); |
d0087b29 VN |
1550 | |
1551 | ip6_tnl_link_config(t); | |
1552 | ||
cf778b00 | 1553 | rcu_assign_pointer(ip6n->tnls_wc[0], t); |
8560f226 | 1554 | return 0; |
1da177e4 LT |
1555 | } |
1556 | ||
0b112457 ND |
1557 | static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[]) |
1558 | { | |
1559 | u8 proto; | |
1560 | ||
c8965932 | 1561 | if (!data || !data[IFLA_IPTUN_PROTO]) |
0b112457 ND |
1562 | return 0; |
1563 | ||
1564 | proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1565 | if (proto != IPPROTO_IPV6 && | |
1566 | proto != IPPROTO_IPIP && | |
1567 | proto != 0) | |
1568 | return -EINVAL; | |
1569 | ||
1570 | return 0; | |
1571 | } | |
1572 | ||
1573 | static void ip6_tnl_netlink_parms(struct nlattr *data[], | |
1574 | struct __ip6_tnl_parm *parms) | |
1575 | { | |
1576 | memset(parms, 0, sizeof(*parms)); | |
1577 | ||
1578 | if (!data) | |
1579 | return; | |
1580 | ||
1581 | if (data[IFLA_IPTUN_LINK]) | |
1582 | parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); | |
1583 | ||
1584 | if (data[IFLA_IPTUN_LOCAL]) | |
1585 | nla_memcpy(&parms->laddr, data[IFLA_IPTUN_LOCAL], | |
1586 | sizeof(struct in6_addr)); | |
1587 | ||
1588 | if (data[IFLA_IPTUN_REMOTE]) | |
1589 | nla_memcpy(&parms->raddr, data[IFLA_IPTUN_REMOTE], | |
1590 | sizeof(struct in6_addr)); | |
1591 | ||
1592 | if (data[IFLA_IPTUN_TTL]) | |
1593 | parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]); | |
1594 | ||
1595 | if (data[IFLA_IPTUN_ENCAP_LIMIT]) | |
1596 | parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]); | |
1597 | ||
1598 | if (data[IFLA_IPTUN_FLOWINFO]) | |
1ff05fb7 | 1599 | parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]); |
0b112457 ND |
1600 | |
1601 | if (data[IFLA_IPTUN_FLAGS]) | |
1602 | parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]); | |
1603 | ||
1604 | if (data[IFLA_IPTUN_PROTO]) | |
1605 | parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1606 | } | |
1607 | ||
1608 | static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev, | |
1609 | struct nlattr *tb[], struct nlattr *data[]) | |
1610 | { | |
1611 | struct net *net = dev_net(dev); | |
1612 | struct ip6_tnl *nt; | |
1613 | ||
1614 | nt = netdev_priv(dev); | |
1615 | ip6_tnl_netlink_parms(data, &nt->parms); | |
1616 | ||
1617 | if (ip6_tnl_locate(net, &nt->parms, 0)) | |
1618 | return -EEXIST; | |
1619 | ||
1620 | return ip6_tnl_create2(dev); | |
1621 | } | |
1622 | ||
1623 | static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[], | |
1624 | struct nlattr *data[]) | |
1625 | { | |
0bd87628 | 1626 | struct ip6_tnl *t = netdev_priv(dev); |
0b112457 | 1627 | struct __ip6_tnl_parm p; |
0bd87628 | 1628 | struct net *net = t->net; |
0b112457 ND |
1629 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1630 | ||
1631 | if (dev == ip6n->fb_tnl_dev) | |
1632 | return -EINVAL; | |
1633 | ||
1634 | ip6_tnl_netlink_parms(data, &p); | |
1635 | ||
1636 | t = ip6_tnl_locate(net, &p, 0); | |
1637 | ||
1638 | if (t) { | |
1639 | if (t->dev != dev) | |
1640 | return -EEXIST; | |
1641 | } else | |
1642 | t = netdev_priv(dev); | |
1643 | ||
1644 | return ip6_tnl_update(t, &p); | |
1645 | } | |
1646 | ||
1e9f3d6f ND |
1647 | static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head) |
1648 | { | |
1649 | struct net *net = dev_net(dev); | |
1650 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1651 | ||
1652 | if (dev != ip6n->fb_tnl_dev) | |
1653 | unregister_netdevice_queue(dev, head); | |
1654 | } | |
1655 | ||
b58d731a | 1656 | static size_t ip6_tnl_get_size(const struct net_device *dev) |
c075b130 ND |
1657 | { |
1658 | return | |
1659 | /* IFLA_IPTUN_LINK */ | |
1660 | nla_total_size(4) + | |
1661 | /* IFLA_IPTUN_LOCAL */ | |
1662 | nla_total_size(sizeof(struct in6_addr)) + | |
1663 | /* IFLA_IPTUN_REMOTE */ | |
1664 | nla_total_size(sizeof(struct in6_addr)) + | |
1665 | /* IFLA_IPTUN_TTL */ | |
1666 | nla_total_size(1) + | |
1667 | /* IFLA_IPTUN_ENCAP_LIMIT */ | |
1668 | nla_total_size(1) + | |
1669 | /* IFLA_IPTUN_FLOWINFO */ | |
1670 | nla_total_size(4) + | |
1671 | /* IFLA_IPTUN_FLAGS */ | |
1672 | nla_total_size(4) + | |
cfa323b6 ND |
1673 | /* IFLA_IPTUN_PROTO */ |
1674 | nla_total_size(1) + | |
c075b130 ND |
1675 | 0; |
1676 | } | |
1677 | ||
b58d731a | 1678 | static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev) |
c075b130 ND |
1679 | { |
1680 | struct ip6_tnl *tunnel = netdev_priv(dev); | |
1681 | struct __ip6_tnl_parm *parm = &tunnel->parms; | |
1682 | ||
1683 | if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || | |
1684 | nla_put(skb, IFLA_IPTUN_LOCAL, sizeof(struct in6_addr), | |
c075b130 | 1685 | &parm->laddr) || |
0d2ede92 DZ |
1686 | nla_put(skb, IFLA_IPTUN_REMOTE, sizeof(struct in6_addr), |
1687 | &parm->raddr) || | |
c075b130 ND |
1688 | nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) || |
1689 | nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) || | |
1690 | nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) || | |
cfa323b6 ND |
1691 | nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) || |
1692 | nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto)) | |
c075b130 ND |
1693 | goto nla_put_failure; |
1694 | return 0; | |
1695 | ||
1696 | nla_put_failure: | |
1697 | return -EMSGSIZE; | |
1698 | } | |
1699 | ||
0b112457 ND |
1700 | static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = { |
1701 | [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, | |
1702 | [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) }, | |
1703 | [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) }, | |
1704 | [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, | |
1705 | [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 }, | |
1706 | [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 }, | |
1707 | [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 }, | |
1708 | [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, | |
1709 | }; | |
1710 | ||
c075b130 ND |
1711 | static struct rtnl_link_ops ip6_link_ops __read_mostly = { |
1712 | .kind = "ip6tnl", | |
1713 | .maxtype = IFLA_IPTUN_MAX, | |
0b112457 | 1714 | .policy = ip6_tnl_policy, |
c075b130 | 1715 | .priv_size = sizeof(struct ip6_tnl), |
0b112457 ND |
1716 | .setup = ip6_tnl_dev_setup, |
1717 | .validate = ip6_tnl_validate, | |
1718 | .newlink = ip6_tnl_newlink, | |
1719 | .changelink = ip6_tnl_changelink, | |
1e9f3d6f | 1720 | .dellink = ip6_tnl_dellink, |
b58d731a ND |
1721 | .get_size = ip6_tnl_get_size, |
1722 | .fill_info = ip6_tnl_fill_info, | |
c075b130 ND |
1723 | }; |
1724 | ||
3ff2cfa5 | 1725 | static struct xfrm6_tunnel ip4ip6_handler __read_mostly = { |
c4d3efaf YK |
1726 | .handler = ip4ip6_rcv, |
1727 | .err_handler = ip4ip6_err, | |
1728 | .priority = 1, | |
1729 | }; | |
1730 | ||
3ff2cfa5 | 1731 | static struct xfrm6_tunnel ip6ip6_handler __read_mostly = { |
0303770d PM |
1732 | .handler = ip6ip6_rcv, |
1733 | .err_handler = ip6ip6_err, | |
d2acc347 | 1734 | .priority = 1, |
1da177e4 LT |
1735 | }; |
1736 | ||
1e9f3d6f | 1737 | static void __net_exit ip6_tnl_destroy_tunnels(struct net *net) |
3e6c9fb5 | 1738 | { |
1e9f3d6f | 1739 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
0bd87628 | 1740 | struct net_device *dev, *aux; |
3e6c9fb5 PE |
1741 | int h; |
1742 | struct ip6_tnl *t; | |
cf4432f5 | 1743 | LIST_HEAD(list); |
3e6c9fb5 | 1744 | |
0bd87628 ND |
1745 | for_each_netdev_safe(net, dev, aux) |
1746 | if (dev->rtnl_link_ops == &ip6_link_ops) | |
1747 | unregister_netdevice_queue(dev, &list); | |
1748 | ||
3e6c9fb5 | 1749 | for (h = 0; h < HASH_SIZE; h++) { |
94767632 | 1750 | t = rtnl_dereference(ip6n->tnls_r_l[h]); |
cf4432f5 | 1751 | while (t != NULL) { |
0bd87628 ND |
1752 | /* If dev is in the same netns, it has already |
1753 | * been added to the list by the previous loop. | |
1754 | */ | |
1755 | if (!net_eq(dev_net(t->dev), net)) | |
1756 | unregister_netdevice_queue(t->dev, &list); | |
94767632 | 1757 | t = rtnl_dereference(t->next); |
cf4432f5 | 1758 | } |
3e6c9fb5 PE |
1759 | } |
1760 | ||
cf4432f5 | 1761 | unregister_netdevice_many(&list); |
3e6c9fb5 PE |
1762 | } |
1763 | ||
2c8c1e72 | 1764 | static int __net_init ip6_tnl_init_net(struct net *net) |
13eeb8e9 | 1765 | { |
ac31cd3c | 1766 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
731abb9c | 1767 | struct ip6_tnl *t = NULL; |
13eeb8e9 | 1768 | int err; |
13eeb8e9 | 1769 | |
3e6c9fb5 PE |
1770 | ip6n->tnls[0] = ip6n->tnls_wc; |
1771 | ip6n->tnls[1] = ip6n->tnls_r_l; | |
1772 | ||
15820e12 PE |
1773 | err = -ENOMEM; |
1774 | ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", | |
1775 | ip6_tnl_dev_setup); | |
1776 | ||
1777 | if (!ip6n->fb_tnl_dev) | |
1778 | goto err_alloc_dev; | |
be77e593 | 1779 | dev_net_set(ip6n->fb_tnl_dev, net); |
bb814094 | 1780 | ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops; |
0bd87628 ND |
1781 | /* FB netdevice is special: we have one, and only one per netns. |
1782 | * Allowing to move it to another netns is clearly unsafe. | |
1783 | */ | |
1784 | ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL; | |
15820e12 | 1785 | |
8560f226 ED |
1786 | err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); |
1787 | if (err < 0) | |
1788 | goto err_register; | |
15820e12 PE |
1789 | |
1790 | err = register_netdev(ip6n->fb_tnl_dev); | |
1791 | if (err < 0) | |
1792 | goto err_register; | |
731abb9c JB |
1793 | |
1794 | t = netdev_priv(ip6n->fb_tnl_dev); | |
1795 | ||
1796 | strcpy(t->parms.name, ip6n->fb_tnl_dev->name); | |
13eeb8e9 PE |
1797 | return 0; |
1798 | ||
15820e12 | 1799 | err_register: |
8560f226 | 1800 | ip6_dev_free(ip6n->fb_tnl_dev); |
15820e12 | 1801 | err_alloc_dev: |
13eeb8e9 PE |
1802 | return err; |
1803 | } | |
1804 | ||
2c8c1e72 | 1805 | static void __net_exit ip6_tnl_exit_net(struct net *net) |
13eeb8e9 | 1806 | { |
3e6c9fb5 | 1807 | rtnl_lock(); |
1e9f3d6f | 1808 | ip6_tnl_destroy_tunnels(net); |
3e6c9fb5 | 1809 | rtnl_unlock(); |
13eeb8e9 PE |
1810 | } |
1811 | ||
1812 | static struct pernet_operations ip6_tnl_net_ops = { | |
1813 | .init = ip6_tnl_init_net, | |
1814 | .exit = ip6_tnl_exit_net, | |
ac31cd3c EB |
1815 | .id = &ip6_tnl_net_id, |
1816 | .size = sizeof(struct ip6_tnl_net), | |
13eeb8e9 PE |
1817 | }; |
1818 | ||
1da177e4 LT |
1819 | /** |
1820 | * ip6_tunnel_init - register protocol and reserve needed resources | |
1821 | * | |
1822 | * Return: 0 on success | |
1823 | **/ | |
1824 | ||
1825 | static int __init ip6_tunnel_init(void) | |
1826 | { | |
1827 | int err; | |
1828 | ||
d5aa407f AD |
1829 | err = register_pernet_device(&ip6_tnl_net_ops); |
1830 | if (err < 0) | |
1831 | goto out_pernet; | |
1832 | ||
1833 | err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET); | |
1834 | if (err < 0) { | |
f3213831 | 1835 | pr_err("%s: can't register ip4ip6\n", __func__); |
d5aa407f | 1836 | goto out_ip4ip6; |
c4d3efaf YK |
1837 | } |
1838 | ||
d5aa407f AD |
1839 | err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6); |
1840 | if (err < 0) { | |
f3213831 | 1841 | pr_err("%s: can't register ip6ip6\n", __func__); |
d5aa407f | 1842 | goto out_ip6ip6; |
1da177e4 | 1843 | } |
c075b130 ND |
1844 | err = rtnl_link_register(&ip6_link_ops); |
1845 | if (err < 0) | |
1846 | goto rtnl_link_failed; | |
13eeb8e9 | 1847 | |
1da177e4 | 1848 | return 0; |
d5aa407f | 1849 | |
c075b130 ND |
1850 | rtnl_link_failed: |
1851 | xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6); | |
d5aa407f | 1852 | out_ip6ip6: |
c4d3efaf | 1853 | xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); |
d5aa407f AD |
1854 | out_ip4ip6: |
1855 | unregister_pernet_device(&ip6_tnl_net_ops); | |
1856 | out_pernet: | |
1da177e4 LT |
1857 | return err; |
1858 | } | |
1859 | ||
1860 | /** | |
1861 | * ip6_tunnel_cleanup - free resources and unregister protocol | |
1862 | **/ | |
1863 | ||
1864 | static void __exit ip6_tunnel_cleanup(void) | |
1865 | { | |
c075b130 | 1866 | rtnl_link_unregister(&ip6_link_ops); |
c4d3efaf | 1867 | if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) |
f3213831 | 1868 | pr_info("%s: can't deregister ip4ip6\n", __func__); |
c4d3efaf | 1869 | |
73d605d1 | 1870 | if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) |
f3213831 | 1871 | pr_info("%s: can't deregister ip6ip6\n", __func__); |
1da177e4 | 1872 | |
ac31cd3c | 1873 | unregister_pernet_device(&ip6_tnl_net_ops); |
1da177e4 LT |
1874 | } |
1875 | ||
1876 | module_init(ip6_tunnel_init); | |
1877 | module_exit(ip6_tunnel_cleanup); |