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); | |
0b112457 ND |
275 | |
276 | err = register_netdevice(dev); | |
277 | if (err < 0) | |
278 | goto out; | |
279 | ||
280 | strcpy(t->parms.name, dev->name); | |
281 | dev->rtnl_link_ops = &ip6_link_ops; | |
282 | ||
283 | dev_hold(dev); | |
284 | ip6_tnl_link(ip6n, t); | |
285 | return 0; | |
286 | ||
287 | out: | |
288 | return err; | |
289 | } | |
290 | ||
1da177e4 | 291 | /** |
2c53040f | 292 | * ip6_tnl_create - create a new tunnel |
1da177e4 LT |
293 | * @p: tunnel parameters |
294 | * @pt: pointer to new tunnel | |
295 | * | |
296 | * Description: | |
297 | * Create tunnel matching given parameters. | |
1ab1457c YH |
298 | * |
299 | * Return: | |
567131a7 | 300 | * created tunnel or NULL |
1da177e4 LT |
301 | **/ |
302 | ||
c12b395a | 303 | static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p) |
1da177e4 LT |
304 | { |
305 | struct net_device *dev; | |
306 | struct ip6_tnl *t; | |
307 | char name[IFNAMSIZ]; | |
308 | int err; | |
309 | ||
34cc7ba6 | 310 | if (p->name[0]) |
1da177e4 | 311 | strlcpy(name, p->name, IFNAMSIZ); |
34cc7ba6 PE |
312 | else |
313 | sprintf(name, "ip6tnl%%d"); | |
314 | ||
c835a677 TG |
315 | dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, |
316 | ip6_tnl_dev_setup); | |
1da177e4 | 317 | if (dev == NULL) |
567131a7 | 318 | goto failed; |
1da177e4 | 319 | |
554eb277 PE |
320 | dev_net_set(dev, net); |
321 | ||
2941a486 | 322 | t = netdev_priv(dev); |
1da177e4 | 323 | t->parms = *p; |
0bd87628 | 324 | t->net = dev_net(dev); |
0b112457 | 325 | err = ip6_tnl_create2(dev); |
8560f226 ED |
326 | if (err < 0) |
327 | goto failed_free; | |
1da177e4 | 328 | |
567131a7 | 329 | return t; |
b37d428b PE |
330 | |
331 | failed_free: | |
8560f226 | 332 | ip6_dev_free(dev); |
567131a7 VN |
333 | failed: |
334 | return NULL; | |
1da177e4 LT |
335 | } |
336 | ||
337 | /** | |
3144581c | 338 | * ip6_tnl_locate - find or create tunnel matching given parameters |
1ab1457c | 339 | * @p: tunnel parameters |
1da177e4 LT |
340 | * @create: != 0 if allowed to create new tunnel if no match found |
341 | * | |
342 | * Description: | |
3144581c | 343 | * ip6_tnl_locate() first tries to locate an existing tunnel |
1da177e4 LT |
344 | * based on @parms. If this is unsuccessful, but @create is set a new |
345 | * tunnel device is created and registered for use. | |
346 | * | |
347 | * Return: | |
567131a7 | 348 | * matching tunnel or NULL |
1da177e4 LT |
349 | **/ |
350 | ||
2dd02c89 | 351 | static struct ip6_tnl *ip6_tnl_locate(struct net *net, |
c12b395a | 352 | struct __ip6_tnl_parm *p, int create) |
1da177e4 | 353 | { |
b71d1d42 ED |
354 | const struct in6_addr *remote = &p->raddr; |
355 | const struct in6_addr *local = &p->laddr; | |
94767632 | 356 | struct ip6_tnl __rcu **tp; |
1da177e4 | 357 | struct ip6_tnl *t; |
2dd02c89 | 358 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 359 | |
94767632 ED |
360 | for (tp = ip6_tnl_bucket(ip6n, p); |
361 | (t = rtnl_dereference(*tp)) != NULL; | |
362 | tp = &t->next) { | |
1da177e4 | 363 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
2b0bb01b SK |
364 | ipv6_addr_equal(remote, &t->parms.raddr)) { |
365 | if (create) | |
366 | return NULL; | |
367 | ||
567131a7 | 368 | return t; |
2b0bb01b | 369 | } |
1da177e4 LT |
370 | } |
371 | if (!create) | |
567131a7 | 372 | return NULL; |
2dd02c89 | 373 | return ip6_tnl_create(net, p); |
1da177e4 LT |
374 | } |
375 | ||
376 | /** | |
3144581c | 377 | * ip6_tnl_dev_uninit - tunnel device uninitializer |
1da177e4 | 378 | * @dev: the device to be destroyed |
1ab1457c | 379 | * |
1da177e4 | 380 | * Description: |
3144581c | 381 | * ip6_tnl_dev_uninit() removes tunnel from its list |
1da177e4 LT |
382 | **/ |
383 | ||
384 | static void | |
3144581c | 385 | ip6_tnl_dev_uninit(struct net_device *dev) |
1da177e4 | 386 | { |
2941a486 | 387 | struct ip6_tnl *t = netdev_priv(dev); |
0bd87628 | 388 | struct net *net = t->net; |
2dd02c89 | 389 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 390 | |
94767632 | 391 | if (dev == ip6n->fb_tnl_dev) |
a9b3cd7f | 392 | RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL); |
94767632 | 393 | else |
2dd02c89 | 394 | ip6_tnl_unlink(ip6n, t); |
1da177e4 LT |
395 | ip6_tnl_dst_reset(t); |
396 | dev_put(dev); | |
397 | } | |
398 | ||
399 | /** | |
400 | * parse_tvl_tnl_enc_lim - handle encapsulation limit option | |
401 | * @skb: received socket buffer | |
402 | * | |
1ab1457c YH |
403 | * Return: |
404 | * 0 if none was found, | |
1da177e4 LT |
405 | * else index to encapsulation limit |
406 | **/ | |
407 | ||
c12b395a | 408 | __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw) |
1da177e4 | 409 | { |
b71d1d42 | 410 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw; |
1da177e4 | 411 | __u8 nexthdr = ipv6h->nexthdr; |
67ba4152 | 412 | __u16 off = sizeof(*ipv6h); |
1da177e4 LT |
413 | |
414 | while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { | |
415 | __u16 optlen = 0; | |
416 | struct ipv6_opt_hdr *hdr; | |
67ba4152 | 417 | if (raw + off + sizeof(*hdr) > skb->data && |
1da177e4 LT |
418 | !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr))) |
419 | break; | |
420 | ||
421 | hdr = (struct ipv6_opt_hdr *) (raw + off); | |
422 | if (nexthdr == NEXTHDR_FRAGMENT) { | |
423 | struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; | |
424 | if (frag_hdr->frag_off) | |
425 | break; | |
426 | optlen = 8; | |
427 | } else if (nexthdr == NEXTHDR_AUTH) { | |
428 | optlen = (hdr->hdrlen + 2) << 2; | |
429 | } else { | |
430 | optlen = ipv6_optlen(hdr); | |
431 | } | |
432 | if (nexthdr == NEXTHDR_DEST) { | |
433 | __u16 i = off + 2; | |
434 | while (1) { | |
435 | struct ipv6_tlv_tnl_enc_lim *tel; | |
436 | ||
437 | /* No more room for encapsulation limit */ | |
438 | if (i + sizeof (*tel) > off + optlen) | |
439 | break; | |
440 | ||
441 | tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i]; | |
442 | /* return index of option if found and valid */ | |
443 | if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && | |
444 | tel->length == 1) | |
445 | return i; | |
446 | /* else jump to next option */ | |
447 | if (tel->type) | |
448 | i += tel->length + 2; | |
449 | else | |
450 | i++; | |
451 | } | |
452 | } | |
453 | nexthdr = hdr->nexthdr; | |
454 | off += optlen; | |
455 | } | |
456 | return 0; | |
457 | } | |
c12b395a | 458 | EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim); |
1da177e4 LT |
459 | |
460 | /** | |
e490d1d8 | 461 | * ip6_tnl_err - tunnel error handler |
1da177e4 LT |
462 | * |
463 | * Description: | |
e490d1d8 | 464 | * ip6_tnl_err() should handle errors in the tunnel according |
1da177e4 LT |
465 | * to the specifications in RFC 2473. |
466 | **/ | |
467 | ||
d2acc347 | 468 | static int |
502b0935 | 469 | ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, |
d5fdd6ba | 470 | u8 *type, u8 *code, int *msg, __u32 *info, int offset) |
1da177e4 | 471 | { |
b71d1d42 | 472 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data; |
1da177e4 LT |
473 | struct ip6_tnl *t; |
474 | int rel_msg = 0; | |
d5fdd6ba BH |
475 | u8 rel_type = ICMPV6_DEST_UNREACH; |
476 | u8 rel_code = ICMPV6_ADDR_UNREACH; | |
1da177e4 LT |
477 | __u32 rel_info = 0; |
478 | __u16 len; | |
d2acc347 | 479 | int err = -ENOENT; |
1da177e4 | 480 | |
1ab1457c YH |
481 | /* If the packet doesn't contain the original IPv6 header we are |
482 | in trouble since we might need the source address for further | |
1da177e4 LT |
483 | processing of the error. */ |
484 | ||
2922bc8a | 485 | rcu_read_lock(); |
8704ca7e | 486 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, |
2dd02c89 | 487 | &ipv6h->saddr)) == NULL) |
1da177e4 LT |
488 | goto out; |
489 | ||
502b0935 YK |
490 | if (t->parms.proto != ipproto && t->parms.proto != 0) |
491 | goto out; | |
492 | ||
d2acc347 HX |
493 | err = 0; |
494 | ||
e490d1d8 | 495 | switch (*type) { |
1da177e4 LT |
496 | __u32 teli; |
497 | struct ipv6_tlv_tnl_enc_lim *tel; | |
498 | __u32 mtu; | |
499 | case ICMPV6_DEST_UNREACH: | |
e87cc472 JP |
500 | net_warn_ratelimited("%s: Path to destination invalid or inactive!\n", |
501 | t->parms.name); | |
1da177e4 LT |
502 | rel_msg = 1; |
503 | break; | |
504 | case ICMPV6_TIME_EXCEED: | |
e490d1d8 | 505 | if ((*code) == ICMPV6_EXC_HOPLIMIT) { |
e87cc472 JP |
506 | net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", |
507 | t->parms.name); | |
1da177e4 LT |
508 | rel_msg = 1; |
509 | } | |
510 | break; | |
511 | case ICMPV6_PARAMPROB: | |
107a5fe6 | 512 | teli = 0; |
e490d1d8 | 513 | if ((*code) == ICMPV6_HDR_FIELD) |
c12b395a | 514 | teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); |
1da177e4 | 515 | |
704eae1f | 516 | if (teli && teli == *info - 2) { |
1da177e4 LT |
517 | tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; |
518 | if (tel->encap_limit == 0) { | |
e87cc472 JP |
519 | net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", |
520 | t->parms.name); | |
1da177e4 LT |
521 | rel_msg = 1; |
522 | } | |
e87cc472 JP |
523 | } else { |
524 | net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n", | |
525 | t->parms.name); | |
1da177e4 LT |
526 | } |
527 | break; | |
528 | case ICMPV6_PKT_TOOBIG: | |
704eae1f | 529 | mtu = *info - offset; |
1da177e4 LT |
530 | if (mtu < IPV6_MIN_MTU) |
531 | mtu = IPV6_MIN_MTU; | |
532 | t->dev->mtu = mtu; | |
533 | ||
67ba4152 | 534 | if ((len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) { |
1da177e4 LT |
535 | rel_type = ICMPV6_PKT_TOOBIG; |
536 | rel_code = 0; | |
537 | rel_info = mtu; | |
538 | rel_msg = 1; | |
539 | } | |
540 | break; | |
541 | } | |
e490d1d8 YK |
542 | |
543 | *type = rel_type; | |
544 | *code = rel_code; | |
545 | *info = rel_info; | |
546 | *msg = rel_msg; | |
547 | ||
548 | out: | |
2922bc8a | 549 | rcu_read_unlock(); |
e490d1d8 YK |
550 | return err; |
551 | } | |
552 | ||
c4d3efaf YK |
553 | static int |
554 | ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 555 | u8 type, u8 code, int offset, __be32 info) |
c4d3efaf YK |
556 | { |
557 | int rel_msg = 0; | |
d5fdd6ba BH |
558 | u8 rel_type = type; |
559 | u8 rel_code = code; | |
704eae1f | 560 | __u32 rel_info = ntohl(info); |
c4d3efaf YK |
561 | int err; |
562 | struct sk_buff *skb2; | |
b71d1d42 | 563 | const struct iphdr *eiph; |
c4d3efaf | 564 | struct rtable *rt; |
31e4543d | 565 | struct flowi4 fl4; |
c4d3efaf | 566 | |
502b0935 YK |
567 | err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, |
568 | &rel_msg, &rel_info, offset); | |
c4d3efaf YK |
569 | if (err < 0) |
570 | return err; | |
571 | ||
572 | if (rel_msg == 0) | |
573 | return 0; | |
574 | ||
575 | switch (rel_type) { | |
576 | case ICMPV6_DEST_UNREACH: | |
577 | if (rel_code != ICMPV6_ADDR_UNREACH) | |
578 | return 0; | |
579 | rel_type = ICMP_DEST_UNREACH; | |
580 | rel_code = ICMP_HOST_UNREACH; | |
581 | break; | |
582 | case ICMPV6_PKT_TOOBIG: | |
583 | if (rel_code != 0) | |
584 | return 0; | |
585 | rel_type = ICMP_DEST_UNREACH; | |
586 | rel_code = ICMP_FRAG_NEEDED; | |
587 | break; | |
ec18d9a2 DM |
588 | case NDISC_REDIRECT: |
589 | rel_type = ICMP_REDIRECT; | |
590 | rel_code = ICMP_REDIR_HOST; | |
c4d3efaf YK |
591 | default: |
592 | return 0; | |
593 | } | |
594 | ||
595 | if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) | |
596 | return 0; | |
597 | ||
598 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
599 | if (!skb2) | |
600 | return 0; | |
601 | ||
adf30907 ED |
602 | skb_dst_drop(skb2); |
603 | ||
c4d3efaf | 604 | skb_pull(skb2, offset); |
c1d2bbe1 | 605 | skb_reset_network_header(skb2); |
eddc9ec5 | 606 | eiph = ip_hdr(skb2); |
c4d3efaf YK |
607 | |
608 | /* Try to guess incoming interface */ | |
31e4543d | 609 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, |
78fbfd8a DM |
610 | eiph->saddr, 0, |
611 | 0, 0, | |
612 | IPPROTO_IPIP, RT_TOS(eiph->tos), 0); | |
b23dd4fe | 613 | if (IS_ERR(rt)) |
c4d3efaf YK |
614 | goto out; |
615 | ||
d8d1f30b | 616 | skb2->dev = rt->dst.dev; |
c4d3efaf YK |
617 | |
618 | /* route "incoming" packet */ | |
619 | if (rt->rt_flags & RTCF_LOCAL) { | |
620 | ip_rt_put(rt); | |
621 | rt = NULL; | |
31e4543d | 622 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, |
78fbfd8a DM |
623 | eiph->daddr, eiph->saddr, |
624 | 0, 0, | |
625 | IPPROTO_IPIP, | |
626 | RT_TOS(eiph->tos), 0); | |
b23dd4fe | 627 | if (IS_ERR(rt) || |
d8d1f30b | 628 | rt->dst.dev->type != ARPHRD_TUNNEL) { |
b23dd4fe DM |
629 | if (!IS_ERR(rt)) |
630 | ip_rt_put(rt); | |
c4d3efaf YK |
631 | goto out; |
632 | } | |
b23dd4fe | 633 | skb_dst_set(skb2, &rt->dst); |
c4d3efaf YK |
634 | } else { |
635 | ip_rt_put(rt); | |
636 | if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, | |
637 | skb2->dev) || | |
adf30907 | 638 | skb_dst(skb2)->dev->type != ARPHRD_TUNNEL) |
c4d3efaf YK |
639 | goto out; |
640 | } | |
641 | ||
642 | /* change mtu on this route */ | |
643 | if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { | |
adf30907 | 644 | if (rel_info > dst_mtu(skb_dst(skb2))) |
c4d3efaf YK |
645 | goto out; |
646 | ||
6700c270 | 647 | skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2, rel_info); |
c4d3efaf | 648 | } |
1ed5c48f | 649 | if (rel_type == ICMP_REDIRECT) |
6700c270 | 650 | skb_dst(skb2)->ops->redirect(skb_dst(skb2), NULL, skb2); |
c4d3efaf | 651 | |
704eae1f | 652 | icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); |
c4d3efaf YK |
653 | |
654 | out: | |
655 | kfree_skb(skb2); | |
656 | return 0; | |
657 | } | |
658 | ||
e490d1d8 YK |
659 | static int |
660 | ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 661 | u8 type, u8 code, int offset, __be32 info) |
e490d1d8 YK |
662 | { |
663 | int rel_msg = 0; | |
d5fdd6ba BH |
664 | u8 rel_type = type; |
665 | u8 rel_code = code; | |
704eae1f | 666 | __u32 rel_info = ntohl(info); |
e490d1d8 YK |
667 | int err; |
668 | ||
502b0935 YK |
669 | err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, |
670 | &rel_msg, &rel_info, offset); | |
e490d1d8 YK |
671 | if (err < 0) |
672 | return err; | |
673 | ||
674 | if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { | |
1da177e4 LT |
675 | struct rt6_info *rt; |
676 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
305d4b3c | 677 | |
1da177e4 | 678 | if (!skb2) |
e490d1d8 | 679 | return 0; |
1da177e4 | 680 | |
adf30907 | 681 | skb_dst_drop(skb2); |
1da177e4 | 682 | skb_pull(skb2, offset); |
c1d2bbe1 | 683 | skb_reset_network_header(skb2); |
1da177e4 LT |
684 | |
685 | /* Try to guess incoming interface */ | |
2f7f54b7 PE |
686 | rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, |
687 | NULL, 0, 0); | |
1da177e4 | 688 | |
d1918542 DM |
689 | if (rt && rt->dst.dev) |
690 | skb2->dev = rt->dst.dev; | |
1da177e4 | 691 | |
3ffe533c | 692 | icmpv6_send(skb2, rel_type, rel_code, rel_info); |
1da177e4 | 693 | |
94e187c0 | 694 | ip6_rt_put(rt); |
1da177e4 LT |
695 | |
696 | kfree_skb(skb2); | |
697 | } | |
e490d1d8 YK |
698 | |
699 | return 0; | |
1da177e4 LT |
700 | } |
701 | ||
f4e0b4c5 ND |
702 | static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
703 | const struct ipv6hdr *ipv6h, | |
704 | struct sk_buff *skb) | |
c4d3efaf YK |
705 | { |
706 | __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; | |
707 | ||
708 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) | |
eddc9ec5 | 709 | ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); |
c4d3efaf | 710 | |
f4e0b4c5 | 711 | return IP6_ECN_decapsulate(ipv6h, skb); |
c4d3efaf YK |
712 | } |
713 | ||
f4e0b4c5 ND |
714 | static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
715 | const struct ipv6hdr *ipv6h, | |
716 | struct sk_buff *skb) | |
1da177e4 | 717 | { |
8359925b | 718 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) |
29bb43b4 | 719 | ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); |
1da177e4 | 720 | |
f4e0b4c5 | 721 | return IP6_ECN_decapsulate(ipv6h, skb); |
1da177e4 | 722 | } |
8359925b | 723 | |
c12b395a | 724 | __u32 ip6_tnl_get_cap(struct ip6_tnl *t, |
d0087b29 VN |
725 | const struct in6_addr *laddr, |
726 | const struct in6_addr *raddr) | |
727 | { | |
c12b395a | 728 | struct __ip6_tnl_parm *p = &t->parms; |
d0087b29 VN |
729 | int ltype = ipv6_addr_type(laddr); |
730 | int rtype = ipv6_addr_type(raddr); | |
731 | __u32 flags = 0; | |
732 | ||
733 | if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) { | |
734 | flags = IP6_TNL_F_CAP_PER_PACKET; | |
735 | } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
736 | rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
737 | !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && | |
738 | (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { | |
739 | if (ltype&IPV6_ADDR_UNICAST) | |
740 | flags |= IP6_TNL_F_CAP_XMIT; | |
741 | if (rtype&IPV6_ADDR_UNICAST) | |
742 | flags |= IP6_TNL_F_CAP_RCV; | |
743 | } | |
744 | return flags; | |
745 | } | |
c12b395a | 746 | EXPORT_SYMBOL(ip6_tnl_get_cap); |
d0087b29 | 747 | |
f1a28eab | 748 | /* called with rcu_read_lock() */ |
c12b395a | 749 | int ip6_tnl_rcv_ctl(struct ip6_tnl *t, |
d0087b29 VN |
750 | const struct in6_addr *laddr, |
751 | const struct in6_addr *raddr) | |
09c6bbf0 | 752 | { |
c12b395a | 753 | struct __ip6_tnl_parm *p = &t->parms; |
09c6bbf0 | 754 | int ret = 0; |
0bd87628 | 755 | struct net *net = t->net; |
09c6bbf0 | 756 | |
d0087b29 VN |
757 | if ((p->flags & IP6_TNL_F_CAP_RCV) || |
758 | ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && | |
759 | (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) { | |
1ab1457c | 760 | struct net_device *ldev = NULL; |
09c6bbf0 VN |
761 | |
762 | if (p->link) | |
f1a28eab | 763 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 764 | |
d0087b29 VN |
765 | if ((ipv6_addr_is_multicast(laddr) || |
766 | likely(ipv6_chk_addr(net, laddr, ldev, 0))) && | |
767 | likely(!ipv6_chk_addr(net, raddr, NULL, 0))) | |
09c6bbf0 | 768 | ret = 1; |
09c6bbf0 VN |
769 | } |
770 | return ret; | |
771 | } | |
c12b395a | 772 | EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl); |
1da177e4 LT |
773 | |
774 | /** | |
3144581c | 775 | * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally |
1da177e4 | 776 | * @skb: received socket buffer |
8359925b YK |
777 | * @protocol: ethernet protocol ID |
778 | * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN | |
1da177e4 LT |
779 | * |
780 | * Return: 0 | |
781 | **/ | |
782 | ||
8359925b | 783 | static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol, |
502b0935 | 784 | __u8 ipproto, |
f4e0b4c5 ND |
785 | int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, |
786 | const struct ipv6hdr *ipv6h, | |
787 | struct sk_buff *skb)) | |
1da177e4 | 788 | { |
1da177e4 | 789 | struct ip6_tnl *t; |
b71d1d42 | 790 | const struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
f4e0b4c5 | 791 | int err; |
1da177e4 | 792 | |
2922bc8a | 793 | rcu_read_lock(); |
1da177e4 | 794 | |
8704ca7e | 795 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, |
2dd02c89 | 796 | &ipv6h->daddr)) != NULL) { |
8f84985f | 797 | struct pcpu_sw_netstats *tstats; |
8560f226 | 798 | |
502b0935 | 799 | if (t->parms.proto != ipproto && t->parms.proto != 0) { |
2922bc8a | 800 | rcu_read_unlock(); |
502b0935 YK |
801 | goto discard; |
802 | } | |
803 | ||
1da177e4 | 804 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
2922bc8a | 805 | rcu_read_unlock(); |
50fba2aa | 806 | goto discard; |
1da177e4 LT |
807 | } |
808 | ||
d0087b29 | 809 | if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) { |
3dca02af | 810 | t->dev->stats.rx_dropped++; |
2922bc8a | 811 | rcu_read_unlock(); |
1da177e4 LT |
812 | goto discard; |
813 | } | |
b0e380b1 | 814 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 815 | skb_reset_network_header(skb); |
8359925b | 816 | skb->protocol = htons(protocol); |
1da177e4 | 817 | memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); |
8359925b | 818 | |
ea23192e | 819 | __skb_tunnel_rx(skb, t->dev, t->net); |
f4e0b4c5 ND |
820 | |
821 | err = dscp_ecn_decapsulate(t, ipv6h, skb); | |
822 | if (unlikely(err)) { | |
823 | if (log_ecn_error) | |
824 | net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n", | |
825 | &ipv6h->saddr, | |
826 | ipv6_get_dsfield(ipv6h)); | |
827 | if (err > 1) { | |
828 | ++t->dev->stats.rx_frame_errors; | |
829 | ++t->dev->stats.rx_errors; | |
830 | rcu_read_unlock(); | |
831 | goto discard; | |
832 | } | |
833 | } | |
834 | ||
8560f226 | 835 | tstats = this_cpu_ptr(t->dev->tstats); |
abb6013c | 836 | u64_stats_update_begin(&tstats->syncp); |
8560f226 ED |
837 | tstats->rx_packets++; |
838 | tstats->rx_bytes += skb->len; | |
abb6013c | 839 | u64_stats_update_end(&tstats->syncp); |
8560f226 | 840 | |
caf586e5 | 841 | netif_rx(skb); |
8990f468 | 842 | |
2922bc8a | 843 | rcu_read_unlock(); |
1da177e4 LT |
844 | return 0; |
845 | } | |
2922bc8a | 846 | rcu_read_unlock(); |
1da177e4 | 847 | return 1; |
50fba2aa HX |
848 | |
849 | discard: | |
850 | kfree_skb(skb); | |
851 | return 0; | |
1da177e4 LT |
852 | } |
853 | ||
c4d3efaf YK |
854 | static int ip4ip6_rcv(struct sk_buff *skb) |
855 | { | |
502b0935 YK |
856 | return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP, |
857 | ip4ip6_dscp_ecn_decapsulate); | |
c4d3efaf YK |
858 | } |
859 | ||
8359925b YK |
860 | static int ip6ip6_rcv(struct sk_buff *skb) |
861 | { | |
502b0935 YK |
862 | return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6, |
863 | ip6ip6_dscp_ecn_decapsulate); | |
8359925b YK |
864 | } |
865 | ||
6fb32dde VN |
866 | struct ipv6_tel_txoption { |
867 | struct ipv6_txoptions ops; | |
868 | __u8 dst_opt[8]; | |
869 | }; | |
1da177e4 | 870 | |
6fb32dde VN |
871 | static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) |
872 | { | |
873 | memset(opt, 0, sizeof(struct ipv6_tel_txoption)); | |
1da177e4 | 874 | |
6fb32dde VN |
875 | opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; |
876 | opt->dst_opt[3] = 1; | |
877 | opt->dst_opt[4] = encap_limit; | |
878 | opt->dst_opt[5] = IPV6_TLV_PADN; | |
879 | opt->dst_opt[6] = 1; | |
1da177e4 | 880 | |
6fb32dde VN |
881 | opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; |
882 | opt->ops.opt_nflen = 8; | |
1da177e4 LT |
883 | } |
884 | ||
885 | /** | |
3144581c | 886 | * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own |
1da177e4 | 887 | * @t: the outgoing tunnel device |
1ab1457c | 888 | * @hdr: IPv6 header from the incoming packet |
1da177e4 LT |
889 | * |
890 | * Description: | |
1ab1457c | 891 | * Avoid trivial tunneling loop by checking that tunnel exit-point |
1da177e4 LT |
892 | * doesn't match source of incoming packet. |
893 | * | |
1ab1457c | 894 | * Return: |
1da177e4 LT |
895 | * 1 if conflict, |
896 | * 0 else | |
897 | **/ | |
898 | ||
92113bfd | 899 | static inline bool |
b71d1d42 | 900 | ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) |
1da177e4 LT |
901 | { |
902 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
903 | } | |
904 | ||
c12b395a | 905 | int ip6_tnl_xmit_ctl(struct ip6_tnl *t) |
09c6bbf0 | 906 | { |
c12b395a | 907 | struct __ip6_tnl_parm *p = &t->parms; |
09c6bbf0 | 908 | int ret = 0; |
0bd87628 | 909 | struct net *net = t->net; |
09c6bbf0 | 910 | |
1ab1457c | 911 | if (p->flags & IP6_TNL_F_CAP_XMIT) { |
09c6bbf0 VN |
912 | struct net_device *ldev = NULL; |
913 | ||
f1a28eab | 914 | rcu_read_lock(); |
09c6bbf0 | 915 | if (p->link) |
f1a28eab | 916 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 917 | |
2f7f54b7 | 918 | if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0))) |
f3213831 JP |
919 | pr_warn("%s xmit: Local address not yet configured!\n", |
920 | p->name); | |
09c6bbf0 | 921 | else if (!ipv6_addr_is_multicast(&p->raddr) && |
2f7f54b7 | 922 | unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0))) |
f3213831 JP |
923 | pr_warn("%s xmit: Routing loop! Remote address found on this node!\n", |
924 | p->name); | |
09c6bbf0 VN |
925 | else |
926 | ret = 1; | |
f1a28eab | 927 | rcu_read_unlock(); |
09c6bbf0 VN |
928 | } |
929 | return ret; | |
930 | } | |
c12b395a | 931 | EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl); |
932 | ||
1da177e4 | 933 | /** |
61ec2aec | 934 | * ip6_tnl_xmit2 - encapsulate packet and send |
1da177e4 | 935 | * @skb: the outgoing socket buffer |
1ab1457c | 936 | * @dev: the outgoing tunnel device |
61ec2aec YK |
937 | * @dsfield: dscp code for outer header |
938 | * @fl: flow of tunneled packet | |
939 | * @encap_limit: encapsulation limit | |
940 | * @pmtu: Path MTU is stored if packet is too big | |
1da177e4 LT |
941 | * |
942 | * Description: | |
943 | * Build new header and do some sanity checks on the packet before sending | |
944 | * it. | |
945 | * | |
1ab1457c | 946 | * Return: |
c4d3efaf | 947 | * 0 on success |
61ec2aec YK |
948 | * -1 fail |
949 | * %-EMSGSIZE message too big. return mtu in this case. | |
1da177e4 LT |
950 | **/ |
951 | ||
61ec2aec YK |
952 | static int ip6_tnl_xmit2(struct sk_buff *skb, |
953 | struct net_device *dev, | |
954 | __u8 dsfield, | |
4c9483b2 | 955 | struct flowi6 *fl6, |
61ec2aec YK |
956 | int encap_limit, |
957 | __u32 *pmtu) | |
1da177e4 | 958 | { |
2941a486 | 959 | struct ip6_tnl *t = netdev_priv(dev); |
0bd87628 | 960 | struct net *net = t->net; |
3dca02af | 961 | struct net_device_stats *stats = &t->dev->stats; |
0660e03f | 962 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
6fb32dde | 963 | struct ipv6_tel_txoption opt; |
d24f22f3 | 964 | struct dst_entry *dst = NULL, *ndst = NULL; |
1da177e4 LT |
965 | struct net_device *tdev; |
966 | int mtu; | |
c2636b4d | 967 | unsigned int max_headroom = sizeof(struct ipv6hdr); |
1da177e4 | 968 | u8 proto; |
61ec2aec | 969 | int err = -1; |
1da177e4 | 970 | |
d24f22f3 ED |
971 | if (!fl6->flowi6_mark) |
972 | dst = ip6_tnl_dst_check(t); | |
89b02126 ED |
973 | if (!dst) { |
974 | ndst = ip6_route_output(net, NULL, fl6); | |
1da177e4 | 975 | |
89b02126 | 976 | if (ndst->error) |
a57ebc90 | 977 | goto tx_err_link_failure; |
89b02126 ED |
978 | ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0); |
979 | if (IS_ERR(ndst)) { | |
980 | err = PTR_ERR(ndst); | |
981 | ndst = NULL; | |
452edd59 DM |
982 | goto tx_err_link_failure; |
983 | } | |
89b02126 | 984 | dst = ndst; |
a57ebc90 | 985 | } |
1da177e4 LT |
986 | |
987 | tdev = dst->dev; | |
988 | ||
989 | if (tdev == dev) { | |
990 | stats->collisions++; | |
e87cc472 JP |
991 | net_warn_ratelimited("%s: Local routing loop detected!\n", |
992 | t->parms.name); | |
1da177e4 LT |
993 | goto tx_err_dst_release; |
994 | } | |
67ba4152 | 995 | mtu = dst_mtu(dst) - sizeof(*ipv6h); |
6fb32dde | 996 | if (encap_limit >= 0) { |
1da177e4 LT |
997 | max_headroom += 8; |
998 | mtu -= 8; | |
999 | } | |
1000 | if (mtu < IPV6_MIN_MTU) | |
1001 | mtu = IPV6_MIN_MTU; | |
adf30907 | 1002 | if (skb_dst(skb)) |
6700c270 | 1003 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); |
1da177e4 | 1004 | if (skb->len > mtu) { |
61ec2aec YK |
1005 | *pmtu = mtu; |
1006 | err = -EMSGSIZE; | |
1da177e4 LT |
1007 | goto tx_err_dst_release; |
1008 | } | |
1009 | ||
963a88b3 | 1010 | skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev))); |
0bd87628 | 1011 | |
1da177e4 LT |
1012 | /* |
1013 | * Okay, now see if we can stuff it in the buffer as-is. | |
1014 | */ | |
1015 | max_headroom += LL_RESERVED_SPACE(tdev); | |
1ab1457c | 1016 | |
cfbba49d PM |
1017 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
1018 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 | 1019 | struct sk_buff *new_skb; |
1ab1457c | 1020 | |
1da177e4 LT |
1021 | if (!(new_skb = skb_realloc_headroom(skb, max_headroom))) |
1022 | goto tx_err_dst_release; | |
1023 | ||
1024 | if (skb->sk) | |
1025 | skb_set_owner_w(new_skb, skb->sk); | |
9ff26449 | 1026 | consume_skb(skb); |
1da177e4 LT |
1027 | skb = new_skb; |
1028 | } | |
d24f22f3 ED |
1029 | if (fl6->flowi6_mark) { |
1030 | skb_dst_set(skb, dst); | |
1031 | ndst = NULL; | |
1032 | } else { | |
1033 | skb_dst_set_noref(skb, dst); | |
1034 | } | |
b0e380b1 | 1035 | skb->transport_header = skb->network_header; |
1da177e4 | 1036 | |
4c9483b2 | 1037 | proto = fl6->flowi6_proto; |
6fb32dde VN |
1038 | if (encap_limit >= 0) { |
1039 | init_tel_txopt(&opt, encap_limit); | |
1040 | ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); | |
1041 | } | |
3d483058 HFS |
1042 | |
1043 | if (likely(!skb->encapsulation)) { | |
1044 | skb_reset_inner_headers(skb); | |
1045 | skb->encapsulation = 1; | |
1046 | } | |
1047 | ||
e2d1bca7 ACM |
1048 | skb_push(skb, sizeof(struct ipv6hdr)); |
1049 | skb_reset_network_header(skb); | |
0660e03f | 1050 | ipv6h = ipv6_hdr(skb); |
cb1ce2ef TH |
1051 | ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), |
1052 | ip6_make_flowlabel(net, skb, fl6->flowlabel, false)); | |
1da177e4 LT |
1053 | ipv6h->hop_limit = t->parms.hop_limit; |
1054 | ipv6h->nexthdr = proto; | |
4e3fd7a0 AD |
1055 | ipv6h->saddr = fl6->saddr; |
1056 | ipv6h->daddr = fl6->daddr; | |
e8f72ea4 | 1057 | ip6tunnel_xmit(skb, dev); |
89b02126 ED |
1058 | if (ndst) |
1059 | ip6_tnl_dst_store(t, ndst); | |
1da177e4 LT |
1060 | return 0; |
1061 | tx_err_link_failure: | |
1062 | stats->tx_carrier_errors++; | |
1063 | dst_link_failure(skb); | |
1064 | tx_err_dst_release: | |
89b02126 | 1065 | dst_release(ndst); |
61ec2aec YK |
1066 | return err; |
1067 | } | |
1068 | ||
c4d3efaf YK |
1069 | static inline int |
1070 | ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1071 | { | |
1072 | struct ip6_tnl *t = netdev_priv(dev); | |
b71d1d42 | 1073 | const struct iphdr *iph = ip_hdr(skb); |
c4d3efaf | 1074 | int encap_limit = -1; |
4c9483b2 | 1075 | struct flowi6 fl6; |
c4d3efaf YK |
1076 | __u8 dsfield; |
1077 | __u32 mtu; | |
1078 | int err; | |
1079 | ||
502b0935 YK |
1080 | if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) || |
1081 | !ip6_tnl_xmit_ctl(t)) | |
c4d3efaf YK |
1082 | return -1; |
1083 | ||
1084 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1085 | encap_limit = t->parms.encap_limit; | |
1086 | ||
67ba4152 | 1087 | memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); |
4c9483b2 | 1088 | fl6.flowi6_proto = IPPROTO_IPIP; |
c4d3efaf YK |
1089 | |
1090 | dsfield = ipv4_get_dsfield(iph); | |
1091 | ||
d24f22f3 | 1092 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
4c9483b2 | 1093 | fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) |
b77f2fa6 | 1094 | & IPV6_TCLASS_MASK; |
d24f22f3 ED |
1095 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
1096 | fl6.flowi6_mark = skb->mark; | |
c4d3efaf | 1097 | |
4c9483b2 | 1098 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); |
c4d3efaf YK |
1099 | if (err != 0) { |
1100 | /* XXX: send ICMP error even if DF is not set. */ | |
1101 | if (err == -EMSGSIZE) | |
1102 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
1103 | htonl(mtu)); | |
1104 | return -1; | |
1105 | } | |
1106 | ||
1107 | return 0; | |
1108 | } | |
1109 | ||
61ec2aec YK |
1110 | static inline int |
1111 | ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1112 | { | |
1113 | struct ip6_tnl *t = netdev_priv(dev); | |
0660e03f | 1114 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
61ec2aec YK |
1115 | int encap_limit = -1; |
1116 | __u16 offset; | |
4c9483b2 | 1117 | struct flowi6 fl6; |
61ec2aec YK |
1118 | __u8 dsfield; |
1119 | __u32 mtu; | |
1120 | int err; | |
1121 | ||
502b0935 YK |
1122 | if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) || |
1123 | !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h)) | |
61ec2aec YK |
1124 | return -1; |
1125 | ||
c12b395a | 1126 | offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); |
d56f90a7 | 1127 | if (offset > 0) { |
61ec2aec | 1128 | struct ipv6_tlv_tnl_enc_lim *tel; |
d56f90a7 | 1129 | tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; |
61ec2aec YK |
1130 | if (tel->encap_limit == 0) { |
1131 | icmpv6_send(skb, ICMPV6_PARAMPROB, | |
3ffe533c | 1132 | ICMPV6_HDR_FIELD, offset + 2); |
61ec2aec YK |
1133 | return -1; |
1134 | } | |
1135 | encap_limit = tel->encap_limit - 1; | |
1136 | } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1137 | encap_limit = t->parms.encap_limit; | |
1138 | ||
67ba4152 | 1139 | memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); |
4c9483b2 | 1140 | fl6.flowi6_proto = IPPROTO_IPV6; |
61ec2aec YK |
1141 | |
1142 | dsfield = ipv6_get_dsfield(ipv6h); | |
d24f22f3 | 1143 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
4c9483b2 | 1144 | fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); |
d24f22f3 | 1145 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) |
3308de2b | 1146 | fl6.flowlabel |= ip6_flowlabel(ipv6h); |
d24f22f3 ED |
1147 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
1148 | fl6.flowi6_mark = skb->mark; | |
61ec2aec | 1149 | |
4c9483b2 | 1150 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); |
61ec2aec YK |
1151 | if (err != 0) { |
1152 | if (err == -EMSGSIZE) | |
3ffe533c | 1153 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
61ec2aec YK |
1154 | return -1; |
1155 | } | |
1156 | ||
1157 | return 0; | |
1158 | } | |
1159 | ||
6fef4c0c | 1160 | static netdev_tx_t |
61ec2aec YK |
1161 | ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) |
1162 | { | |
1163 | struct ip6_tnl *t = netdev_priv(dev); | |
3dca02af | 1164 | struct net_device_stats *stats = &t->dev->stats; |
61ec2aec YK |
1165 | int ret; |
1166 | ||
61ec2aec | 1167 | switch (skb->protocol) { |
60678040 | 1168 | case htons(ETH_P_IP): |
c4d3efaf YK |
1169 | ret = ip4ip6_tnl_xmit(skb, dev); |
1170 | break; | |
60678040 | 1171 | case htons(ETH_P_IPV6): |
61ec2aec YK |
1172 | ret = ip6ip6_tnl_xmit(skb, dev); |
1173 | break; | |
1174 | default: | |
1175 | goto tx_err; | |
1176 | } | |
1177 | ||
1178 | if (ret < 0) | |
1179 | goto tx_err; | |
1180 | ||
6ed10654 | 1181 | return NETDEV_TX_OK; |
61ec2aec | 1182 | |
1da177e4 LT |
1183 | tx_err: |
1184 | stats->tx_errors++; | |
1185 | stats->tx_dropped++; | |
1186 | kfree_skb(skb); | |
6ed10654 | 1187 | return NETDEV_TX_OK; |
1da177e4 LT |
1188 | } |
1189 | ||
3144581c | 1190 | static void ip6_tnl_link_config(struct ip6_tnl *t) |
1da177e4 LT |
1191 | { |
1192 | struct net_device *dev = t->dev; | |
c12b395a | 1193 | struct __ip6_tnl_parm *p = &t->parms; |
4c9483b2 | 1194 | struct flowi6 *fl6 = &t->fl.u.ip6; |
1da177e4 | 1195 | |
3a6d54c5 JP |
1196 | memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); |
1197 | memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
1da177e4 LT |
1198 | |
1199 | /* Set up flowi template */ | |
4e3fd7a0 AD |
1200 | fl6->saddr = p->laddr; |
1201 | fl6->daddr = p->raddr; | |
4c9483b2 DM |
1202 | fl6->flowi6_oif = p->link; |
1203 | fl6->flowlabel = 0; | |
1da177e4 LT |
1204 | |
1205 | if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) | |
4c9483b2 | 1206 | fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; |
1da177e4 | 1207 | if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) |
4c9483b2 | 1208 | fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; |
1da177e4 | 1209 | |
d0087b29 VN |
1210 | p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); |
1211 | p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); | |
1da177e4 LT |
1212 | |
1213 | if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) | |
1214 | dev->flags |= IFF_POINTOPOINT; | |
1215 | else | |
1216 | dev->flags &= ~IFF_POINTOPOINT; | |
1217 | ||
1218 | dev->iflink = p->link; | |
1219 | ||
1220 | if (p->flags & IP6_TNL_F_CAP_XMIT) { | |
305d4b3c VN |
1221 | int strict = (ipv6_addr_type(&p->raddr) & |
1222 | (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); | |
1223 | ||
0bd87628 | 1224 | struct rt6_info *rt = rt6_lookup(t->net, |
2f7f54b7 | 1225 | &p->raddr, &p->laddr, |
305d4b3c | 1226 | p->link, strict); |
1da177e4 LT |
1227 | |
1228 | if (rt == NULL) | |
1229 | return; | |
1230 | ||
d1918542 DM |
1231 | if (rt->dst.dev) { |
1232 | dev->hard_header_len = rt->dst.dev->hard_header_len + | |
67ba4152 | 1233 | sizeof(struct ipv6hdr); |
1da177e4 | 1234 | |
67ba4152 | 1235 | dev->mtu = rt->dst.dev->mtu - sizeof(struct ipv6hdr); |
381601e5 | 1236 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
67ba4152 | 1237 | dev->mtu -= 8; |
1da177e4 LT |
1238 | |
1239 | if (dev->mtu < IPV6_MIN_MTU) | |
1240 | dev->mtu = IPV6_MIN_MTU; | |
1241 | } | |
94e187c0 | 1242 | ip6_rt_put(rt); |
1da177e4 LT |
1243 | } |
1244 | } | |
1245 | ||
1246 | /** | |
3144581c | 1247 | * ip6_tnl_change - update the tunnel parameters |
1da177e4 LT |
1248 | * @t: tunnel to be changed |
1249 | * @p: tunnel configuration parameters | |
1da177e4 LT |
1250 | * |
1251 | * Description: | |
3144581c | 1252 | * ip6_tnl_change() updates the tunnel parameters |
1da177e4 LT |
1253 | **/ |
1254 | ||
1255 | static int | |
c12b395a | 1256 | ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) |
1da177e4 | 1257 | { |
4e3fd7a0 AD |
1258 | t->parms.laddr = p->laddr; |
1259 | t->parms.raddr = p->raddr; | |
1da177e4 LT |
1260 | t->parms.flags = p->flags; |
1261 | t->parms.hop_limit = p->hop_limit; | |
1262 | t->parms.encap_limit = p->encap_limit; | |
1263 | t->parms.flowinfo = p->flowinfo; | |
8181b8c1 | 1264 | t->parms.link = p->link; |
502b0935 | 1265 | t->parms.proto = p->proto; |
0c088890 | 1266 | ip6_tnl_dst_reset(t); |
3144581c | 1267 | ip6_tnl_link_config(t); |
1da177e4 LT |
1268 | return 0; |
1269 | } | |
1270 | ||
0b112457 ND |
1271 | static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) |
1272 | { | |
0bd87628 | 1273 | struct net *net = t->net; |
0b112457 ND |
1274 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1275 | int err; | |
1276 | ||
1277 | ip6_tnl_unlink(ip6n, t); | |
1278 | synchronize_net(); | |
1279 | err = ip6_tnl_change(t, p); | |
1280 | ip6_tnl_link(ip6n, t); | |
1281 | netdev_state_change(t->dev); | |
1282 | return err; | |
1283 | } | |
1284 | ||
c12b395a | 1285 | static void |
1286 | ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u) | |
1287 | { | |
1288 | p->laddr = u->laddr; | |
1289 | p->raddr = u->raddr; | |
1290 | p->flags = u->flags; | |
1291 | p->hop_limit = u->hop_limit; | |
1292 | p->encap_limit = u->encap_limit; | |
1293 | p->flowinfo = u->flowinfo; | |
1294 | p->link = u->link; | |
1295 | p->proto = u->proto; | |
1296 | memcpy(p->name, u->name, sizeof(u->name)); | |
1297 | } | |
1298 | ||
1299 | static void | |
1300 | ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p) | |
1301 | { | |
1302 | u->laddr = p->laddr; | |
1303 | u->raddr = p->raddr; | |
1304 | u->flags = p->flags; | |
1305 | u->hop_limit = p->hop_limit; | |
1306 | u->encap_limit = p->encap_limit; | |
1307 | u->flowinfo = p->flowinfo; | |
1308 | u->link = p->link; | |
1309 | u->proto = p->proto; | |
1310 | memcpy(u->name, p->name, sizeof(u->name)); | |
1311 | } | |
1312 | ||
1da177e4 | 1313 | /** |
3144581c | 1314 | * ip6_tnl_ioctl - configure ipv6 tunnels from userspace |
1da177e4 LT |
1315 | * @dev: virtual device associated with tunnel |
1316 | * @ifr: parameters passed from userspace | |
1317 | * @cmd: command to be performed | |
1318 | * | |
1319 | * Description: | |
3144581c | 1320 | * ip6_tnl_ioctl() is used for managing IPv6 tunnels |
1ab1457c | 1321 | * from userspace. |
1da177e4 LT |
1322 | * |
1323 | * The possible commands are the following: | |
1324 | * %SIOCGETTUNNEL: get tunnel parameters for device | |
1325 | * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters | |
1326 | * %SIOCCHGTUNNEL: change tunnel parameters to those given | |
1327 | * %SIOCDELTUNNEL: delete tunnel | |
1328 | * | |
1ab1457c | 1329 | * The fallback device "ip6tnl0", created during module |
1da177e4 LT |
1330 | * initialization, can be used for creating other tunnel devices. |
1331 | * | |
1332 | * Return: | |
1333 | * 0 on success, | |
1334 | * %-EFAULT if unable to copy data to or from userspace, | |
1335 | * %-EPERM if current process hasn't %CAP_NET_ADMIN set | |
1336 | * %-EINVAL if passed tunnel parameters are invalid, | |
1337 | * %-EEXIST if changing a tunnel's parameters would cause a conflict | |
1338 | * %-ENODEV if attempting to change or delete a nonexisting device | |
1339 | **/ | |
1340 | ||
1341 | static int | |
3144581c | 1342 | ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
1da177e4 LT |
1343 | { |
1344 | int err = 0; | |
1da177e4 | 1345 | struct ip6_tnl_parm p; |
c12b395a | 1346 | struct __ip6_tnl_parm p1; |
74462f0d ND |
1347 | struct ip6_tnl *t = netdev_priv(dev); |
1348 | struct net *net = t->net; | |
2dd02c89 | 1349 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 LT |
1350 | |
1351 | switch (cmd) { | |
1352 | case SIOCGETTUNNEL: | |
15820e12 | 1353 | if (dev == ip6n->fb_tnl_dev) { |
67ba4152 | 1354 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
1da177e4 LT |
1355 | err = -EFAULT; |
1356 | break; | |
1357 | } | |
c12b395a | 1358 | ip6_tnl_parm_from_user(&p1, &p); |
1359 | t = ip6_tnl_locate(net, &p1, 0); | |
74462f0d ND |
1360 | if (t == NULL) |
1361 | t = netdev_priv(dev); | |
5ef5d6c5 DC |
1362 | } else { |
1363 | memset(&p, 0, sizeof(p)); | |
567131a7 | 1364 | } |
c12b395a | 1365 | ip6_tnl_parm_to_user(&p, &t->parms); |
67ba4152 | 1366 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) { |
1da177e4 LT |
1367 | err = -EFAULT; |
1368 | } | |
1369 | break; | |
1370 | case SIOCADDTUNNEL: | |
1371 | case SIOCCHGTUNNEL: | |
1372 | err = -EPERM; | |
af31f412 | 1373 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 1374 | break; |
567131a7 | 1375 | err = -EFAULT; |
67ba4152 | 1376 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
1da177e4 | 1377 | break; |
567131a7 | 1378 | err = -EINVAL; |
502b0935 YK |
1379 | if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && |
1380 | p.proto != 0) | |
1da177e4 | 1381 | break; |
c12b395a | 1382 | ip6_tnl_parm_from_user(&p1, &p); |
1383 | t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL); | |
15820e12 | 1384 | if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) { |
567131a7 VN |
1385 | if (t != NULL) { |
1386 | if (t->dev != dev) { | |
1387 | err = -EEXIST; | |
1388 | break; | |
1389 | } | |
1390 | } else | |
1391 | t = netdev_priv(dev); | |
1392 | ||
0b112457 | 1393 | err = ip6_tnl_update(t, &p1); |
1da177e4 | 1394 | } |
567131a7 | 1395 | if (t) { |
1da177e4 | 1396 | err = 0; |
c12b395a | 1397 | ip6_tnl_parm_to_user(&p, &t->parms); |
1398 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
567131a7 VN |
1399 | err = -EFAULT; |
1400 | ||
1401 | } else | |
1402 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1da177e4 LT |
1403 | break; |
1404 | case SIOCDELTUNNEL: | |
1405 | err = -EPERM; | |
af31f412 | 1406 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1407 | break; |
1408 | ||
15820e12 | 1409 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 | 1410 | err = -EFAULT; |
67ba4152 | 1411 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
1da177e4 | 1412 | break; |
567131a7 | 1413 | err = -ENOENT; |
c12b395a | 1414 | ip6_tnl_parm_from_user(&p1, &p); |
1415 | t = ip6_tnl_locate(net, &p1, 0); | |
1416 | if (t == NULL) | |
1da177e4 | 1417 | break; |
567131a7 | 1418 | err = -EPERM; |
15820e12 | 1419 | if (t->dev == ip6n->fb_tnl_dev) |
1da177e4 | 1420 | break; |
567131a7 | 1421 | dev = t->dev; |
1da177e4 | 1422 | } |
22f8cde5 SH |
1423 | err = 0; |
1424 | unregister_netdevice(dev); | |
1da177e4 LT |
1425 | break; |
1426 | default: | |
1427 | err = -EINVAL; | |
1428 | } | |
1429 | return err; | |
1430 | } | |
1431 | ||
1da177e4 | 1432 | /** |
3144581c | 1433 | * ip6_tnl_change_mtu - change mtu manually for tunnel device |
1da177e4 LT |
1434 | * @dev: virtual device associated with tunnel |
1435 | * @new_mtu: the new mtu | |
1436 | * | |
1437 | * Return: | |
1438 | * 0 on success, | |
1439 | * %-EINVAL if mtu too small | |
1440 | **/ | |
1441 | ||
1442 | static int | |
3144581c | 1443 | ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) |
1da177e4 | 1444 | { |
582442d6 OG |
1445 | struct ip6_tnl *tnl = netdev_priv(dev); |
1446 | ||
1447 | if (tnl->parms.proto == IPPROTO_IPIP) { | |
1448 | if (new_mtu < 68) | |
1449 | return -EINVAL; | |
1450 | } else { | |
1451 | if (new_mtu < IPV6_MIN_MTU) | |
1452 | return -EINVAL; | |
1da177e4 | 1453 | } |
582442d6 OG |
1454 | if (new_mtu > 0xFFF8 - dev->hard_header_len) |
1455 | return -EINVAL; | |
1da177e4 LT |
1456 | dev->mtu = new_mtu; |
1457 | return 0; | |
1458 | } | |
1459 | ||
1326c3d5 SH |
1460 | |
1461 | static const struct net_device_ops ip6_tnl_netdev_ops = { | |
6c6151da | 1462 | .ndo_init = ip6_tnl_dev_init, |
8560f226 | 1463 | .ndo_uninit = ip6_tnl_dev_uninit, |
1326c3d5 | 1464 | .ndo_start_xmit = ip6_tnl_xmit, |
8560f226 | 1465 | .ndo_do_ioctl = ip6_tnl_ioctl, |
1326c3d5 | 1466 | .ndo_change_mtu = ip6_tnl_change_mtu, |
8560f226 | 1467 | .ndo_get_stats = ip6_get_stats, |
1326c3d5 SH |
1468 | }; |
1469 | ||
8560f226 | 1470 | |
1da177e4 | 1471 | /** |
3144581c | 1472 | * ip6_tnl_dev_setup - setup virtual tunnel device |
1da177e4 LT |
1473 | * @dev: virtual device associated with tunnel |
1474 | * | |
1475 | * Description: | |
1476 | * Initialize function pointers and device parameters | |
1477 | **/ | |
1478 | ||
3144581c | 1479 | static void ip6_tnl_dev_setup(struct net_device *dev) |
1da177e4 | 1480 | { |
381601e5 AF |
1481 | struct ip6_tnl *t; |
1482 | ||
1326c3d5 | 1483 | dev->netdev_ops = &ip6_tnl_netdev_ops; |
8560f226 | 1484 | dev->destructor = ip6_dev_free; |
1da177e4 LT |
1485 | |
1486 | dev->type = ARPHRD_TUNNEL6; | |
67ba4152 IM |
1487 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr); |
1488 | dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr); | |
381601e5 AF |
1489 | t = netdev_priv(dev); |
1490 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
67ba4152 | 1491 | dev->mtu -= 8; |
1da177e4 LT |
1492 | dev->flags |= IFF_NOARP; |
1493 | dev->addr_len = sizeof(struct in6_addr); | |
02875878 | 1494 | netif_keep_dst(dev); |
e837735e ND |
1495 | /* This perm addr will be used as interface identifier by IPv6 */ |
1496 | dev->addr_assign_type = NET_ADDR_RANDOM; | |
1497 | eth_random_addr(dev->perm_addr); | |
1da177e4 LT |
1498 | } |
1499 | ||
1500 | ||
1501 | /** | |
3144581c | 1502 | * ip6_tnl_dev_init_gen - general initializer for all tunnel devices |
1da177e4 LT |
1503 | * @dev: virtual device associated with tunnel |
1504 | **/ | |
1505 | ||
8560f226 | 1506 | static inline int |
3144581c | 1507 | ip6_tnl_dev_init_gen(struct net_device *dev) |
1da177e4 | 1508 | { |
2941a486 | 1509 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 | 1510 | |
1da177e4 | 1511 | t->dev = dev; |
0bd87628 | 1512 | t->net = dev_net(dev); |
1c213bd2 | 1513 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
8560f226 ED |
1514 | if (!dev->tstats) |
1515 | return -ENOMEM; | |
1516 | return 0; | |
1da177e4 LT |
1517 | } |
1518 | ||
1519 | /** | |
3144581c | 1520 | * ip6_tnl_dev_init - initializer for all non fallback tunnel devices |
1da177e4 LT |
1521 | * @dev: virtual device associated with tunnel |
1522 | **/ | |
1523 | ||
8560f226 | 1524 | static int ip6_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1525 | { |
2941a486 | 1526 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 ED |
1527 | int err = ip6_tnl_dev_init_gen(dev); |
1528 | ||
1529 | if (err) | |
1530 | return err; | |
3144581c | 1531 | ip6_tnl_link_config(t); |
8560f226 | 1532 | return 0; |
1da177e4 LT |
1533 | } |
1534 | ||
1535 | /** | |
3144581c | 1536 | * ip6_fb_tnl_dev_init - initializer for fallback tunnel device |
1da177e4 LT |
1537 | * @dev: fallback device |
1538 | * | |
1539 | * Return: 0 | |
1540 | **/ | |
1541 | ||
8560f226 | 1542 | static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1543 | { |
2941a486 | 1544 | struct ip6_tnl *t = netdev_priv(dev); |
3e6c9fb5 PE |
1545 | struct net *net = dev_net(dev); |
1546 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1547 | ||
502b0935 | 1548 | t->parms.proto = IPPROTO_IPV6; |
1da177e4 | 1549 | dev_hold(dev); |
d0087b29 | 1550 | |
cf778b00 | 1551 | rcu_assign_pointer(ip6n->tnls_wc[0], t); |
8560f226 | 1552 | return 0; |
1da177e4 LT |
1553 | } |
1554 | ||
0b112457 ND |
1555 | static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[]) |
1556 | { | |
1557 | u8 proto; | |
1558 | ||
c8965932 | 1559 | if (!data || !data[IFLA_IPTUN_PROTO]) |
0b112457 ND |
1560 | return 0; |
1561 | ||
1562 | proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1563 | if (proto != IPPROTO_IPV6 && | |
1564 | proto != IPPROTO_IPIP && | |
1565 | proto != 0) | |
1566 | return -EINVAL; | |
1567 | ||
1568 | return 0; | |
1569 | } | |
1570 | ||
1571 | static void ip6_tnl_netlink_parms(struct nlattr *data[], | |
1572 | struct __ip6_tnl_parm *parms) | |
1573 | { | |
1574 | memset(parms, 0, sizeof(*parms)); | |
1575 | ||
1576 | if (!data) | |
1577 | return; | |
1578 | ||
1579 | if (data[IFLA_IPTUN_LINK]) | |
1580 | parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); | |
1581 | ||
1582 | if (data[IFLA_IPTUN_LOCAL]) | |
1583 | nla_memcpy(&parms->laddr, data[IFLA_IPTUN_LOCAL], | |
1584 | sizeof(struct in6_addr)); | |
1585 | ||
1586 | if (data[IFLA_IPTUN_REMOTE]) | |
1587 | nla_memcpy(&parms->raddr, data[IFLA_IPTUN_REMOTE], | |
1588 | sizeof(struct in6_addr)); | |
1589 | ||
1590 | if (data[IFLA_IPTUN_TTL]) | |
1591 | parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]); | |
1592 | ||
1593 | if (data[IFLA_IPTUN_ENCAP_LIMIT]) | |
1594 | parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]); | |
1595 | ||
1596 | if (data[IFLA_IPTUN_FLOWINFO]) | |
1ff05fb7 | 1597 | parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]); |
0b112457 ND |
1598 | |
1599 | if (data[IFLA_IPTUN_FLAGS]) | |
1600 | parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]); | |
1601 | ||
1602 | if (data[IFLA_IPTUN_PROTO]) | |
1603 | parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1604 | } | |
1605 | ||
1606 | static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev, | |
1607 | struct nlattr *tb[], struct nlattr *data[]) | |
1608 | { | |
1609 | struct net *net = dev_net(dev); | |
1610 | struct ip6_tnl *nt; | |
1611 | ||
1612 | nt = netdev_priv(dev); | |
1613 | ip6_tnl_netlink_parms(data, &nt->parms); | |
1614 | ||
1615 | if (ip6_tnl_locate(net, &nt->parms, 0)) | |
1616 | return -EEXIST; | |
1617 | ||
1618 | return ip6_tnl_create2(dev); | |
1619 | } | |
1620 | ||
1621 | static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[], | |
1622 | struct nlattr *data[]) | |
1623 | { | |
0bd87628 | 1624 | struct ip6_tnl *t = netdev_priv(dev); |
0b112457 | 1625 | struct __ip6_tnl_parm p; |
0bd87628 | 1626 | struct net *net = t->net; |
0b112457 ND |
1627 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1628 | ||
1629 | if (dev == ip6n->fb_tnl_dev) | |
1630 | return -EINVAL; | |
1631 | ||
1632 | ip6_tnl_netlink_parms(data, &p); | |
1633 | ||
1634 | t = ip6_tnl_locate(net, &p, 0); | |
1635 | ||
1636 | if (t) { | |
1637 | if (t->dev != dev) | |
1638 | return -EEXIST; | |
1639 | } else | |
1640 | t = netdev_priv(dev); | |
1641 | ||
1642 | return ip6_tnl_update(t, &p); | |
1643 | } | |
1644 | ||
1e9f3d6f ND |
1645 | static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head) |
1646 | { | |
1647 | struct net *net = dev_net(dev); | |
1648 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1649 | ||
1650 | if (dev != ip6n->fb_tnl_dev) | |
1651 | unregister_netdevice_queue(dev, head); | |
1652 | } | |
1653 | ||
b58d731a | 1654 | static size_t ip6_tnl_get_size(const struct net_device *dev) |
c075b130 ND |
1655 | { |
1656 | return | |
1657 | /* IFLA_IPTUN_LINK */ | |
1658 | nla_total_size(4) + | |
1659 | /* IFLA_IPTUN_LOCAL */ | |
1660 | nla_total_size(sizeof(struct in6_addr)) + | |
1661 | /* IFLA_IPTUN_REMOTE */ | |
1662 | nla_total_size(sizeof(struct in6_addr)) + | |
1663 | /* IFLA_IPTUN_TTL */ | |
1664 | nla_total_size(1) + | |
1665 | /* IFLA_IPTUN_ENCAP_LIMIT */ | |
1666 | nla_total_size(1) + | |
1667 | /* IFLA_IPTUN_FLOWINFO */ | |
1668 | nla_total_size(4) + | |
1669 | /* IFLA_IPTUN_FLAGS */ | |
1670 | nla_total_size(4) + | |
cfa323b6 ND |
1671 | /* IFLA_IPTUN_PROTO */ |
1672 | nla_total_size(1) + | |
c075b130 ND |
1673 | 0; |
1674 | } | |
1675 | ||
b58d731a | 1676 | static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev) |
c075b130 ND |
1677 | { |
1678 | struct ip6_tnl *tunnel = netdev_priv(dev); | |
1679 | struct __ip6_tnl_parm *parm = &tunnel->parms; | |
1680 | ||
1681 | if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || | |
1682 | nla_put(skb, IFLA_IPTUN_LOCAL, sizeof(struct in6_addr), | |
c075b130 | 1683 | &parm->laddr) || |
0d2ede92 DZ |
1684 | nla_put(skb, IFLA_IPTUN_REMOTE, sizeof(struct in6_addr), |
1685 | &parm->raddr) || | |
c075b130 ND |
1686 | nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) || |
1687 | nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) || | |
1688 | nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) || | |
cfa323b6 ND |
1689 | nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) || |
1690 | nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto)) | |
c075b130 ND |
1691 | goto nla_put_failure; |
1692 | return 0; | |
1693 | ||
1694 | nla_put_failure: | |
1695 | return -EMSGSIZE; | |
1696 | } | |
1697 | ||
0b112457 ND |
1698 | static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = { |
1699 | [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, | |
1700 | [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) }, | |
1701 | [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) }, | |
1702 | [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, | |
1703 | [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 }, | |
1704 | [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 }, | |
1705 | [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 }, | |
1706 | [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, | |
1707 | }; | |
1708 | ||
c075b130 ND |
1709 | static struct rtnl_link_ops ip6_link_ops __read_mostly = { |
1710 | .kind = "ip6tnl", | |
1711 | .maxtype = IFLA_IPTUN_MAX, | |
0b112457 | 1712 | .policy = ip6_tnl_policy, |
c075b130 | 1713 | .priv_size = sizeof(struct ip6_tnl), |
0b112457 ND |
1714 | .setup = ip6_tnl_dev_setup, |
1715 | .validate = ip6_tnl_validate, | |
1716 | .newlink = ip6_tnl_newlink, | |
1717 | .changelink = ip6_tnl_changelink, | |
1e9f3d6f | 1718 | .dellink = ip6_tnl_dellink, |
b58d731a ND |
1719 | .get_size = ip6_tnl_get_size, |
1720 | .fill_info = ip6_tnl_fill_info, | |
c075b130 ND |
1721 | }; |
1722 | ||
3ff2cfa5 | 1723 | static struct xfrm6_tunnel ip4ip6_handler __read_mostly = { |
c4d3efaf YK |
1724 | .handler = ip4ip6_rcv, |
1725 | .err_handler = ip4ip6_err, | |
1726 | .priority = 1, | |
1727 | }; | |
1728 | ||
3ff2cfa5 | 1729 | static struct xfrm6_tunnel ip6ip6_handler __read_mostly = { |
0303770d PM |
1730 | .handler = ip6ip6_rcv, |
1731 | .err_handler = ip6ip6_err, | |
d2acc347 | 1732 | .priority = 1, |
1da177e4 LT |
1733 | }; |
1734 | ||
1e9f3d6f | 1735 | static void __net_exit ip6_tnl_destroy_tunnels(struct net *net) |
3e6c9fb5 | 1736 | { |
1e9f3d6f | 1737 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
0bd87628 | 1738 | struct net_device *dev, *aux; |
3e6c9fb5 PE |
1739 | int h; |
1740 | struct ip6_tnl *t; | |
cf4432f5 | 1741 | LIST_HEAD(list); |
3e6c9fb5 | 1742 | |
0bd87628 ND |
1743 | for_each_netdev_safe(net, dev, aux) |
1744 | if (dev->rtnl_link_ops == &ip6_link_ops) | |
1745 | unregister_netdevice_queue(dev, &list); | |
1746 | ||
3e6c9fb5 | 1747 | for (h = 0; h < HASH_SIZE; h++) { |
94767632 | 1748 | t = rtnl_dereference(ip6n->tnls_r_l[h]); |
cf4432f5 | 1749 | while (t != NULL) { |
0bd87628 ND |
1750 | /* If dev is in the same netns, it has already |
1751 | * been added to the list by the previous loop. | |
1752 | */ | |
1753 | if (!net_eq(dev_net(t->dev), net)) | |
1754 | unregister_netdevice_queue(t->dev, &list); | |
94767632 | 1755 | t = rtnl_dereference(t->next); |
cf4432f5 | 1756 | } |
3e6c9fb5 PE |
1757 | } |
1758 | ||
cf4432f5 | 1759 | unregister_netdevice_many(&list); |
3e6c9fb5 PE |
1760 | } |
1761 | ||
2c8c1e72 | 1762 | static int __net_init ip6_tnl_init_net(struct net *net) |
13eeb8e9 | 1763 | { |
ac31cd3c | 1764 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
731abb9c | 1765 | struct ip6_tnl *t = NULL; |
13eeb8e9 | 1766 | int err; |
13eeb8e9 | 1767 | |
3e6c9fb5 PE |
1768 | ip6n->tnls[0] = ip6n->tnls_wc; |
1769 | ip6n->tnls[1] = ip6n->tnls_r_l; | |
1770 | ||
15820e12 PE |
1771 | err = -ENOMEM; |
1772 | ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", | |
c835a677 | 1773 | NET_NAME_UNKNOWN, ip6_tnl_dev_setup); |
15820e12 PE |
1774 | |
1775 | if (!ip6n->fb_tnl_dev) | |
1776 | goto err_alloc_dev; | |
be77e593 | 1777 | dev_net_set(ip6n->fb_tnl_dev, net); |
bb814094 | 1778 | ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops; |
0bd87628 ND |
1779 | /* FB netdevice is special: we have one, and only one per netns. |
1780 | * Allowing to move it to another netns is clearly unsafe. | |
1781 | */ | |
1782 | ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL; | |
15820e12 | 1783 | |
8560f226 ED |
1784 | err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); |
1785 | if (err < 0) | |
1786 | goto err_register; | |
15820e12 PE |
1787 | |
1788 | err = register_netdev(ip6n->fb_tnl_dev); | |
1789 | if (err < 0) | |
1790 | goto err_register; | |
731abb9c JB |
1791 | |
1792 | t = netdev_priv(ip6n->fb_tnl_dev); | |
1793 | ||
1794 | strcpy(t->parms.name, ip6n->fb_tnl_dev->name); | |
13eeb8e9 PE |
1795 | return 0; |
1796 | ||
15820e12 | 1797 | err_register: |
8560f226 | 1798 | ip6_dev_free(ip6n->fb_tnl_dev); |
15820e12 | 1799 | err_alloc_dev: |
13eeb8e9 PE |
1800 | return err; |
1801 | } | |
1802 | ||
2c8c1e72 | 1803 | static void __net_exit ip6_tnl_exit_net(struct net *net) |
13eeb8e9 | 1804 | { |
3e6c9fb5 | 1805 | rtnl_lock(); |
1e9f3d6f | 1806 | ip6_tnl_destroy_tunnels(net); |
3e6c9fb5 | 1807 | rtnl_unlock(); |
13eeb8e9 PE |
1808 | } |
1809 | ||
1810 | static struct pernet_operations ip6_tnl_net_ops = { | |
1811 | .init = ip6_tnl_init_net, | |
1812 | .exit = ip6_tnl_exit_net, | |
ac31cd3c EB |
1813 | .id = &ip6_tnl_net_id, |
1814 | .size = sizeof(struct ip6_tnl_net), | |
13eeb8e9 PE |
1815 | }; |
1816 | ||
1da177e4 LT |
1817 | /** |
1818 | * ip6_tunnel_init - register protocol and reserve needed resources | |
1819 | * | |
1820 | * Return: 0 on success | |
1821 | **/ | |
1822 | ||
1823 | static int __init ip6_tunnel_init(void) | |
1824 | { | |
1825 | int err; | |
1826 | ||
d5aa407f AD |
1827 | err = register_pernet_device(&ip6_tnl_net_ops); |
1828 | if (err < 0) | |
1829 | goto out_pernet; | |
1830 | ||
1831 | err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET); | |
1832 | if (err < 0) { | |
f3213831 | 1833 | pr_err("%s: can't register ip4ip6\n", __func__); |
d5aa407f | 1834 | goto out_ip4ip6; |
c4d3efaf YK |
1835 | } |
1836 | ||
d5aa407f AD |
1837 | err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6); |
1838 | if (err < 0) { | |
f3213831 | 1839 | pr_err("%s: can't register ip6ip6\n", __func__); |
d5aa407f | 1840 | goto out_ip6ip6; |
1da177e4 | 1841 | } |
c075b130 ND |
1842 | err = rtnl_link_register(&ip6_link_ops); |
1843 | if (err < 0) | |
1844 | goto rtnl_link_failed; | |
13eeb8e9 | 1845 | |
1da177e4 | 1846 | return 0; |
d5aa407f | 1847 | |
c075b130 ND |
1848 | rtnl_link_failed: |
1849 | xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6); | |
d5aa407f | 1850 | out_ip6ip6: |
c4d3efaf | 1851 | xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); |
d5aa407f AD |
1852 | out_ip4ip6: |
1853 | unregister_pernet_device(&ip6_tnl_net_ops); | |
1854 | out_pernet: | |
1da177e4 LT |
1855 | return err; |
1856 | } | |
1857 | ||
1858 | /** | |
1859 | * ip6_tunnel_cleanup - free resources and unregister protocol | |
1860 | **/ | |
1861 | ||
1862 | static void __exit ip6_tunnel_cleanup(void) | |
1863 | { | |
c075b130 | 1864 | rtnl_link_unregister(&ip6_link_ops); |
c4d3efaf | 1865 | if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) |
f3213831 | 1866 | pr_info("%s: can't deregister ip4ip6\n", __func__); |
c4d3efaf | 1867 | |
73d605d1 | 1868 | if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) |
f3213831 | 1869 | pr_info("%s: can't deregister ip6ip6\n", __func__); |
1da177e4 | 1870 | |
ac31cd3c | 1871 | unregister_pernet_device(&ip6_tnl_net_ops); |
1da177e4 LT |
1872 | } |
1873 | ||
1874 | module_init(ip6_tunnel_init); | |
1875 | module_exit(ip6_tunnel_cleanup); |