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 | ||
c835a677 TG |
318 | dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, |
319 | ip6_tnl_dev_setup); | |
1da177e4 | 320 | if (dev == NULL) |
567131a7 | 321 | goto failed; |
1da177e4 | 322 | |
554eb277 PE |
323 | dev_net_set(dev, net); |
324 | ||
2941a486 | 325 | t = netdev_priv(dev); |
1da177e4 | 326 | t->parms = *p; |
0bd87628 | 327 | t->net = dev_net(dev); |
0b112457 | 328 | err = ip6_tnl_create2(dev); |
8560f226 ED |
329 | if (err < 0) |
330 | goto failed_free; | |
1da177e4 | 331 | |
567131a7 | 332 | return t; |
b37d428b PE |
333 | |
334 | failed_free: | |
8560f226 | 335 | ip6_dev_free(dev); |
567131a7 VN |
336 | failed: |
337 | return NULL; | |
1da177e4 LT |
338 | } |
339 | ||
340 | /** | |
3144581c | 341 | * ip6_tnl_locate - find or create tunnel matching given parameters |
1ab1457c | 342 | * @p: tunnel parameters |
1da177e4 LT |
343 | * @create: != 0 if allowed to create new tunnel if no match found |
344 | * | |
345 | * Description: | |
3144581c | 346 | * ip6_tnl_locate() first tries to locate an existing tunnel |
1da177e4 LT |
347 | * based on @parms. If this is unsuccessful, but @create is set a new |
348 | * tunnel device is created and registered for use. | |
349 | * | |
350 | * Return: | |
567131a7 | 351 | * matching tunnel or NULL |
1da177e4 LT |
352 | **/ |
353 | ||
2dd02c89 | 354 | static struct ip6_tnl *ip6_tnl_locate(struct net *net, |
c12b395a | 355 | struct __ip6_tnl_parm *p, int create) |
1da177e4 | 356 | { |
b71d1d42 ED |
357 | const struct in6_addr *remote = &p->raddr; |
358 | const struct in6_addr *local = &p->laddr; | |
94767632 | 359 | struct ip6_tnl __rcu **tp; |
1da177e4 | 360 | struct ip6_tnl *t; |
2dd02c89 | 361 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 362 | |
94767632 ED |
363 | for (tp = ip6_tnl_bucket(ip6n, p); |
364 | (t = rtnl_dereference(*tp)) != NULL; | |
365 | tp = &t->next) { | |
1da177e4 | 366 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
567131a7 VN |
367 | ipv6_addr_equal(remote, &t->parms.raddr)) |
368 | return t; | |
1da177e4 LT |
369 | } |
370 | if (!create) | |
567131a7 | 371 | return NULL; |
2dd02c89 | 372 | return ip6_tnl_create(net, p); |
1da177e4 LT |
373 | } |
374 | ||
375 | /** | |
3144581c | 376 | * ip6_tnl_dev_uninit - tunnel device uninitializer |
1da177e4 | 377 | * @dev: the device to be destroyed |
1ab1457c | 378 | * |
1da177e4 | 379 | * Description: |
3144581c | 380 | * ip6_tnl_dev_uninit() removes tunnel from its list |
1da177e4 LT |
381 | **/ |
382 | ||
383 | static void | |
3144581c | 384 | ip6_tnl_dev_uninit(struct net_device *dev) |
1da177e4 | 385 | { |
2941a486 | 386 | struct ip6_tnl *t = netdev_priv(dev); |
0bd87628 | 387 | struct net *net = t->net; |
2dd02c89 | 388 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 389 | |
94767632 | 390 | if (dev == ip6n->fb_tnl_dev) |
a9b3cd7f | 391 | RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL); |
94767632 | 392 | else |
2dd02c89 | 393 | ip6_tnl_unlink(ip6n, t); |
1da177e4 LT |
394 | ip6_tnl_dst_reset(t); |
395 | dev_put(dev); | |
396 | } | |
397 | ||
398 | /** | |
399 | * parse_tvl_tnl_enc_lim - handle encapsulation limit option | |
400 | * @skb: received socket buffer | |
401 | * | |
1ab1457c YH |
402 | * Return: |
403 | * 0 if none was found, | |
1da177e4 LT |
404 | * else index to encapsulation limit |
405 | **/ | |
406 | ||
c12b395a | 407 | __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw) |
1da177e4 | 408 | { |
b71d1d42 | 409 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw; |
1da177e4 LT |
410 | __u8 nexthdr = ipv6h->nexthdr; |
411 | __u16 off = sizeof (*ipv6h); | |
412 | ||
413 | while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { | |
414 | __u16 optlen = 0; | |
415 | struct ipv6_opt_hdr *hdr; | |
416 | if (raw + off + sizeof (*hdr) > skb->data && | |
417 | !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr))) | |
418 | break; | |
419 | ||
420 | hdr = (struct ipv6_opt_hdr *) (raw + off); | |
421 | if (nexthdr == NEXTHDR_FRAGMENT) { | |
422 | struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; | |
423 | if (frag_hdr->frag_off) | |
424 | break; | |
425 | optlen = 8; | |
426 | } else if (nexthdr == NEXTHDR_AUTH) { | |
427 | optlen = (hdr->hdrlen + 2) << 2; | |
428 | } else { | |
429 | optlen = ipv6_optlen(hdr); | |
430 | } | |
431 | if (nexthdr == NEXTHDR_DEST) { | |
432 | __u16 i = off + 2; | |
433 | while (1) { | |
434 | struct ipv6_tlv_tnl_enc_lim *tel; | |
435 | ||
436 | /* No more room for encapsulation limit */ | |
437 | if (i + sizeof (*tel) > off + optlen) | |
438 | break; | |
439 | ||
440 | tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i]; | |
441 | /* return index of option if found and valid */ | |
442 | if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && | |
443 | tel->length == 1) | |
444 | return i; | |
445 | /* else jump to next option */ | |
446 | if (tel->type) | |
447 | i += tel->length + 2; | |
448 | else | |
449 | i++; | |
450 | } | |
451 | } | |
452 | nexthdr = hdr->nexthdr; | |
453 | off += optlen; | |
454 | } | |
455 | return 0; | |
456 | } | |
c12b395a | 457 | EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim); |
1da177e4 LT |
458 | |
459 | /** | |
e490d1d8 | 460 | * ip6_tnl_err - tunnel error handler |
1da177e4 LT |
461 | * |
462 | * Description: | |
e490d1d8 | 463 | * ip6_tnl_err() should handle errors in the tunnel according |
1da177e4 LT |
464 | * to the specifications in RFC 2473. |
465 | **/ | |
466 | ||
d2acc347 | 467 | static int |
502b0935 | 468 | ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, |
d5fdd6ba | 469 | u8 *type, u8 *code, int *msg, __u32 *info, int offset) |
1da177e4 | 470 | { |
b71d1d42 | 471 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data; |
1da177e4 LT |
472 | struct ip6_tnl *t; |
473 | int rel_msg = 0; | |
d5fdd6ba BH |
474 | u8 rel_type = ICMPV6_DEST_UNREACH; |
475 | u8 rel_code = ICMPV6_ADDR_UNREACH; | |
1da177e4 LT |
476 | __u32 rel_info = 0; |
477 | __u16 len; | |
d2acc347 | 478 | int err = -ENOENT; |
1da177e4 | 479 | |
1ab1457c YH |
480 | /* If the packet doesn't contain the original IPv6 header we are |
481 | in trouble since we might need the source address for further | |
1da177e4 LT |
482 | processing of the error. */ |
483 | ||
2922bc8a | 484 | rcu_read_lock(); |
8704ca7e | 485 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, |
2dd02c89 | 486 | &ipv6h->saddr)) == NULL) |
1da177e4 LT |
487 | goto out; |
488 | ||
502b0935 YK |
489 | if (t->parms.proto != ipproto && t->parms.proto != 0) |
490 | goto out; | |
491 | ||
d2acc347 HX |
492 | err = 0; |
493 | ||
e490d1d8 | 494 | switch (*type) { |
1da177e4 LT |
495 | __u32 teli; |
496 | struct ipv6_tlv_tnl_enc_lim *tel; | |
497 | __u32 mtu; | |
498 | case ICMPV6_DEST_UNREACH: | |
e87cc472 JP |
499 | net_warn_ratelimited("%s: Path to destination invalid or inactive!\n", |
500 | t->parms.name); | |
1da177e4 LT |
501 | rel_msg = 1; |
502 | break; | |
503 | case ICMPV6_TIME_EXCEED: | |
e490d1d8 | 504 | if ((*code) == ICMPV6_EXC_HOPLIMIT) { |
e87cc472 JP |
505 | net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", |
506 | t->parms.name); | |
1da177e4 LT |
507 | rel_msg = 1; |
508 | } | |
509 | break; | |
510 | case ICMPV6_PARAMPROB: | |
107a5fe6 | 511 | teli = 0; |
e490d1d8 | 512 | if ((*code) == ICMPV6_HDR_FIELD) |
c12b395a | 513 | teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); |
1da177e4 | 514 | |
704eae1f | 515 | if (teli && teli == *info - 2) { |
1da177e4 LT |
516 | tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; |
517 | if (tel->encap_limit == 0) { | |
e87cc472 JP |
518 | net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", |
519 | t->parms.name); | |
1da177e4 LT |
520 | rel_msg = 1; |
521 | } | |
e87cc472 JP |
522 | } else { |
523 | net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n", | |
524 | t->parms.name); | |
1da177e4 LT |
525 | } |
526 | break; | |
527 | case ICMPV6_PKT_TOOBIG: | |
704eae1f | 528 | mtu = *info - offset; |
1da177e4 LT |
529 | if (mtu < IPV6_MIN_MTU) |
530 | mtu = IPV6_MIN_MTU; | |
531 | t->dev->mtu = mtu; | |
532 | ||
cc6cdac0 | 533 | if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) { |
1da177e4 LT |
534 | rel_type = ICMPV6_PKT_TOOBIG; |
535 | rel_code = 0; | |
536 | rel_info = mtu; | |
537 | rel_msg = 1; | |
538 | } | |
539 | break; | |
540 | } | |
e490d1d8 YK |
541 | |
542 | *type = rel_type; | |
543 | *code = rel_code; | |
544 | *info = rel_info; | |
545 | *msg = rel_msg; | |
546 | ||
547 | out: | |
2922bc8a | 548 | rcu_read_unlock(); |
e490d1d8 YK |
549 | return err; |
550 | } | |
551 | ||
c4d3efaf YK |
552 | static int |
553 | ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 554 | u8 type, u8 code, int offset, __be32 info) |
c4d3efaf YK |
555 | { |
556 | int rel_msg = 0; | |
d5fdd6ba BH |
557 | u8 rel_type = type; |
558 | u8 rel_code = code; | |
704eae1f | 559 | __u32 rel_info = ntohl(info); |
c4d3efaf YK |
560 | int err; |
561 | struct sk_buff *skb2; | |
b71d1d42 | 562 | const struct iphdr *eiph; |
c4d3efaf | 563 | struct rtable *rt; |
31e4543d | 564 | struct flowi4 fl4; |
c4d3efaf | 565 | |
502b0935 YK |
566 | err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, |
567 | &rel_msg, &rel_info, offset); | |
c4d3efaf YK |
568 | if (err < 0) |
569 | return err; | |
570 | ||
571 | if (rel_msg == 0) | |
572 | return 0; | |
573 | ||
574 | switch (rel_type) { | |
575 | case ICMPV6_DEST_UNREACH: | |
576 | if (rel_code != ICMPV6_ADDR_UNREACH) | |
577 | return 0; | |
578 | rel_type = ICMP_DEST_UNREACH; | |
579 | rel_code = ICMP_HOST_UNREACH; | |
580 | break; | |
581 | case ICMPV6_PKT_TOOBIG: | |
582 | if (rel_code != 0) | |
583 | return 0; | |
584 | rel_type = ICMP_DEST_UNREACH; | |
585 | rel_code = ICMP_FRAG_NEEDED; | |
586 | break; | |
ec18d9a2 DM |
587 | case NDISC_REDIRECT: |
588 | rel_type = ICMP_REDIRECT; | |
589 | rel_code = ICMP_REDIR_HOST; | |
c4d3efaf YK |
590 | default: |
591 | return 0; | |
592 | } | |
593 | ||
594 | if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) | |
595 | return 0; | |
596 | ||
597 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
598 | if (!skb2) | |
599 | return 0; | |
600 | ||
adf30907 ED |
601 | skb_dst_drop(skb2); |
602 | ||
c4d3efaf | 603 | skb_pull(skb2, offset); |
c1d2bbe1 | 604 | skb_reset_network_header(skb2); |
eddc9ec5 | 605 | eiph = ip_hdr(skb2); |
c4d3efaf YK |
606 | |
607 | /* Try to guess incoming interface */ | |
31e4543d | 608 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, |
78fbfd8a DM |
609 | eiph->saddr, 0, |
610 | 0, 0, | |
611 | IPPROTO_IPIP, RT_TOS(eiph->tos), 0); | |
b23dd4fe | 612 | if (IS_ERR(rt)) |
c4d3efaf YK |
613 | goto out; |
614 | ||
d8d1f30b | 615 | skb2->dev = rt->dst.dev; |
c4d3efaf YK |
616 | |
617 | /* route "incoming" packet */ | |
618 | if (rt->rt_flags & RTCF_LOCAL) { | |
619 | ip_rt_put(rt); | |
620 | rt = NULL; | |
31e4543d | 621 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, |
78fbfd8a DM |
622 | eiph->daddr, eiph->saddr, |
623 | 0, 0, | |
624 | IPPROTO_IPIP, | |
625 | RT_TOS(eiph->tos), 0); | |
b23dd4fe | 626 | if (IS_ERR(rt) || |
d8d1f30b | 627 | rt->dst.dev->type != ARPHRD_TUNNEL) { |
b23dd4fe DM |
628 | if (!IS_ERR(rt)) |
629 | ip_rt_put(rt); | |
c4d3efaf YK |
630 | goto out; |
631 | } | |
b23dd4fe | 632 | skb_dst_set(skb2, &rt->dst); |
c4d3efaf YK |
633 | } else { |
634 | ip_rt_put(rt); | |
635 | if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, | |
636 | skb2->dev) || | |
adf30907 | 637 | skb_dst(skb2)->dev->type != ARPHRD_TUNNEL) |
c4d3efaf YK |
638 | goto out; |
639 | } | |
640 | ||
641 | /* change mtu on this route */ | |
642 | if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { | |
adf30907 | 643 | if (rel_info > dst_mtu(skb_dst(skb2))) |
c4d3efaf YK |
644 | goto out; |
645 | ||
6700c270 | 646 | skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2, rel_info); |
c4d3efaf | 647 | } |
1ed5c48f | 648 | if (rel_type == ICMP_REDIRECT) |
6700c270 | 649 | skb_dst(skb2)->ops->redirect(skb_dst(skb2), NULL, skb2); |
c4d3efaf | 650 | |
704eae1f | 651 | icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); |
c4d3efaf YK |
652 | |
653 | out: | |
654 | kfree_skb(skb2); | |
655 | return 0; | |
656 | } | |
657 | ||
e490d1d8 YK |
658 | static int |
659 | ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 660 | u8 type, u8 code, int offset, __be32 info) |
e490d1d8 YK |
661 | { |
662 | int rel_msg = 0; | |
d5fdd6ba BH |
663 | u8 rel_type = type; |
664 | u8 rel_code = code; | |
704eae1f | 665 | __u32 rel_info = ntohl(info); |
e490d1d8 YK |
666 | int err; |
667 | ||
502b0935 YK |
668 | err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, |
669 | &rel_msg, &rel_info, offset); | |
e490d1d8 YK |
670 | if (err < 0) |
671 | return err; | |
672 | ||
673 | if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { | |
1da177e4 LT |
674 | struct rt6_info *rt; |
675 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
305d4b3c | 676 | |
1da177e4 | 677 | if (!skb2) |
e490d1d8 | 678 | return 0; |
1da177e4 | 679 | |
adf30907 | 680 | skb_dst_drop(skb2); |
1da177e4 | 681 | skb_pull(skb2, offset); |
c1d2bbe1 | 682 | skb_reset_network_header(skb2); |
1da177e4 LT |
683 | |
684 | /* Try to guess incoming interface */ | |
2f7f54b7 PE |
685 | rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, |
686 | NULL, 0, 0); | |
1da177e4 | 687 | |
d1918542 DM |
688 | if (rt && rt->dst.dev) |
689 | skb2->dev = rt->dst.dev; | |
1da177e4 | 690 | |
3ffe533c | 691 | icmpv6_send(skb2, rel_type, rel_code, rel_info); |
1da177e4 | 692 | |
94e187c0 | 693 | ip6_rt_put(rt); |
1da177e4 LT |
694 | |
695 | kfree_skb(skb2); | |
696 | } | |
e490d1d8 YK |
697 | |
698 | return 0; | |
1da177e4 LT |
699 | } |
700 | ||
f4e0b4c5 ND |
701 | static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
702 | const struct ipv6hdr *ipv6h, | |
703 | struct sk_buff *skb) | |
c4d3efaf YK |
704 | { |
705 | __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; | |
706 | ||
707 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) | |
eddc9ec5 | 708 | ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); |
c4d3efaf | 709 | |
f4e0b4c5 | 710 | return IP6_ECN_decapsulate(ipv6h, skb); |
c4d3efaf YK |
711 | } |
712 | ||
f4e0b4c5 ND |
713 | static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
714 | const struct ipv6hdr *ipv6h, | |
715 | struct sk_buff *skb) | |
1da177e4 | 716 | { |
8359925b | 717 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) |
29bb43b4 | 718 | ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); |
1da177e4 | 719 | |
f4e0b4c5 | 720 | return IP6_ECN_decapsulate(ipv6h, skb); |
1da177e4 | 721 | } |
8359925b | 722 | |
c12b395a | 723 | __u32 ip6_tnl_get_cap(struct ip6_tnl *t, |
d0087b29 VN |
724 | const struct in6_addr *laddr, |
725 | const struct in6_addr *raddr) | |
726 | { | |
c12b395a | 727 | struct __ip6_tnl_parm *p = &t->parms; |
d0087b29 VN |
728 | int ltype = ipv6_addr_type(laddr); |
729 | int rtype = ipv6_addr_type(raddr); | |
730 | __u32 flags = 0; | |
731 | ||
732 | if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) { | |
733 | flags = IP6_TNL_F_CAP_PER_PACKET; | |
734 | } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
735 | rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
736 | !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && | |
737 | (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { | |
738 | if (ltype&IPV6_ADDR_UNICAST) | |
739 | flags |= IP6_TNL_F_CAP_XMIT; | |
740 | if (rtype&IPV6_ADDR_UNICAST) | |
741 | flags |= IP6_TNL_F_CAP_RCV; | |
742 | } | |
743 | return flags; | |
744 | } | |
c12b395a | 745 | EXPORT_SYMBOL(ip6_tnl_get_cap); |
d0087b29 | 746 | |
f1a28eab | 747 | /* called with rcu_read_lock() */ |
c12b395a | 748 | int ip6_tnl_rcv_ctl(struct ip6_tnl *t, |
d0087b29 VN |
749 | const struct in6_addr *laddr, |
750 | const struct in6_addr *raddr) | |
09c6bbf0 | 751 | { |
c12b395a | 752 | struct __ip6_tnl_parm *p = &t->parms; |
09c6bbf0 | 753 | int ret = 0; |
0bd87628 | 754 | struct net *net = t->net; |
09c6bbf0 | 755 | |
d0087b29 VN |
756 | if ((p->flags & IP6_TNL_F_CAP_RCV) || |
757 | ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && | |
758 | (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) { | |
1ab1457c | 759 | struct net_device *ldev = NULL; |
09c6bbf0 VN |
760 | |
761 | if (p->link) | |
f1a28eab | 762 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 763 | |
d0087b29 VN |
764 | if ((ipv6_addr_is_multicast(laddr) || |
765 | likely(ipv6_chk_addr(net, laddr, ldev, 0))) && | |
766 | likely(!ipv6_chk_addr(net, raddr, NULL, 0))) | |
09c6bbf0 | 767 | ret = 1; |
09c6bbf0 VN |
768 | } |
769 | return ret; | |
770 | } | |
c12b395a | 771 | EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl); |
1da177e4 LT |
772 | |
773 | /** | |
3144581c | 774 | * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally |
1da177e4 | 775 | * @skb: received socket buffer |
8359925b YK |
776 | * @protocol: ethernet protocol ID |
777 | * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN | |
1da177e4 LT |
778 | * |
779 | * Return: 0 | |
780 | **/ | |
781 | ||
8359925b | 782 | static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol, |
502b0935 | 783 | __u8 ipproto, |
f4e0b4c5 ND |
784 | int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, |
785 | const struct ipv6hdr *ipv6h, | |
786 | struct sk_buff *skb)) | |
1da177e4 | 787 | { |
1da177e4 | 788 | struct ip6_tnl *t; |
b71d1d42 | 789 | const struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
f4e0b4c5 | 790 | int err; |
1da177e4 | 791 | |
2922bc8a | 792 | rcu_read_lock(); |
1da177e4 | 793 | |
8704ca7e | 794 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, |
2dd02c89 | 795 | &ipv6h->daddr)) != NULL) { |
8f84985f | 796 | struct pcpu_sw_netstats *tstats; |
8560f226 | 797 | |
502b0935 | 798 | if (t->parms.proto != ipproto && t->parms.proto != 0) { |
2922bc8a | 799 | rcu_read_unlock(); |
502b0935 YK |
800 | goto discard; |
801 | } | |
802 | ||
1da177e4 | 803 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
2922bc8a | 804 | rcu_read_unlock(); |
50fba2aa | 805 | goto discard; |
1da177e4 LT |
806 | } |
807 | ||
d0087b29 | 808 | if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) { |
3dca02af | 809 | t->dev->stats.rx_dropped++; |
2922bc8a | 810 | rcu_read_unlock(); |
1da177e4 LT |
811 | goto discard; |
812 | } | |
b0e380b1 | 813 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 814 | skb_reset_network_header(skb); |
8359925b | 815 | skb->protocol = htons(protocol); |
1da177e4 | 816 | memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); |
8359925b | 817 | |
ea23192e | 818 | __skb_tunnel_rx(skb, t->dev, t->net); |
f4e0b4c5 ND |
819 | |
820 | err = dscp_ecn_decapsulate(t, ipv6h, skb); | |
821 | if (unlikely(err)) { | |
822 | if (log_ecn_error) | |
823 | net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n", | |
824 | &ipv6h->saddr, | |
825 | ipv6_get_dsfield(ipv6h)); | |
826 | if (err > 1) { | |
827 | ++t->dev->stats.rx_frame_errors; | |
828 | ++t->dev->stats.rx_errors; | |
829 | rcu_read_unlock(); | |
830 | goto discard; | |
831 | } | |
832 | } | |
833 | ||
8560f226 | 834 | tstats = this_cpu_ptr(t->dev->tstats); |
abb6013c | 835 | u64_stats_update_begin(&tstats->syncp); |
8560f226 ED |
836 | tstats->rx_packets++; |
837 | tstats->rx_bytes += skb->len; | |
abb6013c | 838 | u64_stats_update_end(&tstats->syncp); |
8560f226 | 839 | |
caf586e5 | 840 | netif_rx(skb); |
8990f468 | 841 | |
2922bc8a | 842 | rcu_read_unlock(); |
1da177e4 LT |
843 | return 0; |
844 | } | |
2922bc8a | 845 | rcu_read_unlock(); |
1da177e4 | 846 | return 1; |
50fba2aa HX |
847 | |
848 | discard: | |
849 | kfree_skb(skb); | |
850 | return 0; | |
1da177e4 LT |
851 | } |
852 | ||
c4d3efaf YK |
853 | static int ip4ip6_rcv(struct sk_buff *skb) |
854 | { | |
502b0935 YK |
855 | return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP, |
856 | ip4ip6_dscp_ecn_decapsulate); | |
c4d3efaf YK |
857 | } |
858 | ||
8359925b YK |
859 | static int ip6ip6_rcv(struct sk_buff *skb) |
860 | { | |
502b0935 YK |
861 | return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6, |
862 | ip6ip6_dscp_ecn_decapsulate); | |
8359925b YK |
863 | } |
864 | ||
6fb32dde VN |
865 | struct ipv6_tel_txoption { |
866 | struct ipv6_txoptions ops; | |
867 | __u8 dst_opt[8]; | |
868 | }; | |
1da177e4 | 869 | |
6fb32dde VN |
870 | static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) |
871 | { | |
872 | memset(opt, 0, sizeof(struct ipv6_tel_txoption)); | |
1da177e4 | 873 | |
6fb32dde VN |
874 | opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; |
875 | opt->dst_opt[3] = 1; | |
876 | opt->dst_opt[4] = encap_limit; | |
877 | opt->dst_opt[5] = IPV6_TLV_PADN; | |
878 | opt->dst_opt[6] = 1; | |
1da177e4 | 879 | |
6fb32dde VN |
880 | opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; |
881 | opt->ops.opt_nflen = 8; | |
1da177e4 LT |
882 | } |
883 | ||
884 | /** | |
3144581c | 885 | * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own |
1da177e4 | 886 | * @t: the outgoing tunnel device |
1ab1457c | 887 | * @hdr: IPv6 header from the incoming packet |
1da177e4 LT |
888 | * |
889 | * Description: | |
1ab1457c | 890 | * Avoid trivial tunneling loop by checking that tunnel exit-point |
1da177e4 LT |
891 | * doesn't match source of incoming packet. |
892 | * | |
1ab1457c | 893 | * Return: |
1da177e4 LT |
894 | * 1 if conflict, |
895 | * 0 else | |
896 | **/ | |
897 | ||
92113bfd | 898 | static inline bool |
b71d1d42 | 899 | ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) |
1da177e4 LT |
900 | { |
901 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
902 | } | |
903 | ||
c12b395a | 904 | int ip6_tnl_xmit_ctl(struct ip6_tnl *t) |
09c6bbf0 | 905 | { |
c12b395a | 906 | struct __ip6_tnl_parm *p = &t->parms; |
09c6bbf0 | 907 | int ret = 0; |
0bd87628 | 908 | struct net *net = t->net; |
09c6bbf0 | 909 | |
1ab1457c | 910 | if (p->flags & IP6_TNL_F_CAP_XMIT) { |
09c6bbf0 VN |
911 | struct net_device *ldev = NULL; |
912 | ||
f1a28eab | 913 | rcu_read_lock(); |
09c6bbf0 | 914 | if (p->link) |
f1a28eab | 915 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 916 | |
2f7f54b7 | 917 | if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0))) |
f3213831 JP |
918 | pr_warn("%s xmit: Local address not yet configured!\n", |
919 | p->name); | |
09c6bbf0 | 920 | else if (!ipv6_addr_is_multicast(&p->raddr) && |
2f7f54b7 | 921 | unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0))) |
f3213831 JP |
922 | pr_warn("%s xmit: Routing loop! Remote address found on this node!\n", |
923 | p->name); | |
09c6bbf0 VN |
924 | else |
925 | ret = 1; | |
f1a28eab | 926 | rcu_read_unlock(); |
09c6bbf0 VN |
927 | } |
928 | return ret; | |
929 | } | |
c12b395a | 930 | EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl); |
931 | ||
1da177e4 | 932 | /** |
61ec2aec | 933 | * ip6_tnl_xmit2 - encapsulate packet and send |
1da177e4 | 934 | * @skb: the outgoing socket buffer |
1ab1457c | 935 | * @dev: the outgoing tunnel device |
61ec2aec YK |
936 | * @dsfield: dscp code for outer header |
937 | * @fl: flow of tunneled packet | |
938 | * @encap_limit: encapsulation limit | |
939 | * @pmtu: Path MTU is stored if packet is too big | |
1da177e4 LT |
940 | * |
941 | * Description: | |
942 | * Build new header and do some sanity checks on the packet before sending | |
943 | * it. | |
944 | * | |
1ab1457c | 945 | * Return: |
c4d3efaf | 946 | * 0 on success |
61ec2aec YK |
947 | * -1 fail |
948 | * %-EMSGSIZE message too big. return mtu in this case. | |
1da177e4 LT |
949 | **/ |
950 | ||
61ec2aec YK |
951 | static int ip6_tnl_xmit2(struct sk_buff *skb, |
952 | struct net_device *dev, | |
953 | __u8 dsfield, | |
4c9483b2 | 954 | struct flowi6 *fl6, |
61ec2aec YK |
955 | int encap_limit, |
956 | __u32 *pmtu) | |
1da177e4 | 957 | { |
2941a486 | 958 | struct ip6_tnl *t = netdev_priv(dev); |
0bd87628 | 959 | struct net *net = t->net; |
3dca02af | 960 | struct net_device_stats *stats = &t->dev->stats; |
0660e03f | 961 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
6fb32dde | 962 | struct ipv6_tel_txoption opt; |
d24f22f3 | 963 | struct dst_entry *dst = NULL, *ndst = NULL; |
1da177e4 LT |
964 | struct net_device *tdev; |
965 | int mtu; | |
c2636b4d | 966 | unsigned int max_headroom = sizeof(struct ipv6hdr); |
1da177e4 | 967 | u8 proto; |
61ec2aec | 968 | int err = -1; |
1da177e4 | 969 | |
d24f22f3 ED |
970 | if (!fl6->flowi6_mark) |
971 | dst = ip6_tnl_dst_check(t); | |
89b02126 ED |
972 | if (!dst) { |
973 | ndst = ip6_route_output(net, NULL, fl6); | |
1da177e4 | 974 | |
89b02126 | 975 | if (ndst->error) |
a57ebc90 | 976 | goto tx_err_link_failure; |
89b02126 ED |
977 | ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0); |
978 | if (IS_ERR(ndst)) { | |
979 | err = PTR_ERR(ndst); | |
980 | ndst = NULL; | |
452edd59 DM |
981 | goto tx_err_link_failure; |
982 | } | |
89b02126 | 983 | dst = ndst; |
a57ebc90 | 984 | } |
1da177e4 LT |
985 | |
986 | tdev = dst->dev; | |
987 | ||
988 | if (tdev == dev) { | |
989 | stats->collisions++; | |
e87cc472 JP |
990 | net_warn_ratelimited("%s: Local routing loop detected!\n", |
991 | t->parms.name); | |
1da177e4 LT |
992 | goto tx_err_dst_release; |
993 | } | |
994 | mtu = dst_mtu(dst) - sizeof (*ipv6h); | |
6fb32dde | 995 | if (encap_limit >= 0) { |
1da177e4 LT |
996 | max_headroom += 8; |
997 | mtu -= 8; | |
998 | } | |
999 | if (mtu < IPV6_MIN_MTU) | |
1000 | mtu = IPV6_MIN_MTU; | |
adf30907 | 1001 | if (skb_dst(skb)) |
6700c270 | 1002 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); |
1da177e4 | 1003 | if (skb->len > mtu) { |
61ec2aec YK |
1004 | *pmtu = mtu; |
1005 | err = -EMSGSIZE; | |
1da177e4 LT |
1006 | goto tx_err_dst_release; |
1007 | } | |
1008 | ||
963a88b3 | 1009 | skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev))); |
0bd87628 | 1010 | |
1da177e4 LT |
1011 | /* |
1012 | * Okay, now see if we can stuff it in the buffer as-is. | |
1013 | */ | |
1014 | max_headroom += LL_RESERVED_SPACE(tdev); | |
1ab1457c | 1015 | |
cfbba49d PM |
1016 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
1017 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 | 1018 | struct sk_buff *new_skb; |
1ab1457c | 1019 | |
1da177e4 LT |
1020 | if (!(new_skb = skb_realloc_headroom(skb, max_headroom))) |
1021 | goto tx_err_dst_release; | |
1022 | ||
1023 | if (skb->sk) | |
1024 | skb_set_owner_w(new_skb, skb->sk); | |
9ff26449 | 1025 | consume_skb(skb); |
1da177e4 LT |
1026 | skb = new_skb; |
1027 | } | |
d24f22f3 ED |
1028 | if (fl6->flowi6_mark) { |
1029 | skb_dst_set(skb, dst); | |
1030 | ndst = NULL; | |
1031 | } else { | |
1032 | skb_dst_set_noref(skb, dst); | |
1033 | } | |
b0e380b1 | 1034 | skb->transport_header = skb->network_header; |
1da177e4 | 1035 | |
4c9483b2 | 1036 | proto = fl6->flowi6_proto; |
6fb32dde VN |
1037 | if (encap_limit >= 0) { |
1038 | init_tel_txopt(&opt, encap_limit); | |
1039 | ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); | |
1040 | } | |
3d483058 HFS |
1041 | |
1042 | if (likely(!skb->encapsulation)) { | |
1043 | skb_reset_inner_headers(skb); | |
1044 | skb->encapsulation = 1; | |
1045 | } | |
1046 | ||
e2d1bca7 ACM |
1047 | skb_push(skb, sizeof(struct ipv6hdr)); |
1048 | skb_reset_network_header(skb); | |
0660e03f | 1049 | ipv6h = ipv6_hdr(skb); |
cb1ce2ef TH |
1050 | ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), |
1051 | ip6_make_flowlabel(net, skb, fl6->flowlabel, false)); | |
1da177e4 LT |
1052 | ipv6h->hop_limit = t->parms.hop_limit; |
1053 | ipv6h->nexthdr = proto; | |
4e3fd7a0 AD |
1054 | ipv6h->saddr = fl6->saddr; |
1055 | ipv6h->daddr = fl6->daddr; | |
e8f72ea4 | 1056 | ip6tunnel_xmit(skb, dev); |
89b02126 ED |
1057 | if (ndst) |
1058 | ip6_tnl_dst_store(t, ndst); | |
1da177e4 LT |
1059 | return 0; |
1060 | tx_err_link_failure: | |
1061 | stats->tx_carrier_errors++; | |
1062 | dst_link_failure(skb); | |
1063 | tx_err_dst_release: | |
89b02126 | 1064 | dst_release(ndst); |
61ec2aec YK |
1065 | return err; |
1066 | } | |
1067 | ||
c4d3efaf YK |
1068 | static inline int |
1069 | ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1070 | { | |
1071 | struct ip6_tnl *t = netdev_priv(dev); | |
b71d1d42 | 1072 | const struct iphdr *iph = ip_hdr(skb); |
c4d3efaf | 1073 | int encap_limit = -1; |
4c9483b2 | 1074 | struct flowi6 fl6; |
c4d3efaf YK |
1075 | __u8 dsfield; |
1076 | __u32 mtu; | |
1077 | int err; | |
1078 | ||
502b0935 YK |
1079 | if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) || |
1080 | !ip6_tnl_xmit_ctl(t)) | |
c4d3efaf YK |
1081 | return -1; |
1082 | ||
1083 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1084 | encap_limit = t->parms.encap_limit; | |
1085 | ||
4c9483b2 DM |
1086 | memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6)); |
1087 | fl6.flowi6_proto = IPPROTO_IPIP; | |
c4d3efaf YK |
1088 | |
1089 | dsfield = ipv4_get_dsfield(iph); | |
1090 | ||
d24f22f3 | 1091 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
4c9483b2 | 1092 | fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) |
b77f2fa6 | 1093 | & IPV6_TCLASS_MASK; |
d24f22f3 ED |
1094 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
1095 | fl6.flowi6_mark = skb->mark; | |
c4d3efaf | 1096 | |
4c9483b2 | 1097 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); |
c4d3efaf YK |
1098 | if (err != 0) { |
1099 | /* XXX: send ICMP error even if DF is not set. */ | |
1100 | if (err == -EMSGSIZE) | |
1101 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
1102 | htonl(mtu)); | |
1103 | return -1; | |
1104 | } | |
1105 | ||
1106 | return 0; | |
1107 | } | |
1108 | ||
61ec2aec YK |
1109 | static inline int |
1110 | ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1111 | { | |
1112 | struct ip6_tnl *t = netdev_priv(dev); | |
0660e03f | 1113 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
61ec2aec YK |
1114 | int encap_limit = -1; |
1115 | __u16 offset; | |
4c9483b2 | 1116 | struct flowi6 fl6; |
61ec2aec YK |
1117 | __u8 dsfield; |
1118 | __u32 mtu; | |
1119 | int err; | |
1120 | ||
502b0935 YK |
1121 | if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) || |
1122 | !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h)) | |
61ec2aec YK |
1123 | return -1; |
1124 | ||
c12b395a | 1125 | offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); |
d56f90a7 | 1126 | if (offset > 0) { |
61ec2aec | 1127 | struct ipv6_tlv_tnl_enc_lim *tel; |
d56f90a7 | 1128 | tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; |
61ec2aec YK |
1129 | if (tel->encap_limit == 0) { |
1130 | icmpv6_send(skb, ICMPV6_PARAMPROB, | |
3ffe533c | 1131 | ICMPV6_HDR_FIELD, offset + 2); |
61ec2aec YK |
1132 | return -1; |
1133 | } | |
1134 | encap_limit = tel->encap_limit - 1; | |
1135 | } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1136 | encap_limit = t->parms.encap_limit; | |
1137 | ||
4c9483b2 DM |
1138 | memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6)); |
1139 | fl6.flowi6_proto = IPPROTO_IPV6; | |
61ec2aec YK |
1140 | |
1141 | dsfield = ipv6_get_dsfield(ipv6h); | |
d24f22f3 | 1142 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
4c9483b2 | 1143 | fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); |
d24f22f3 | 1144 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) |
3308de2b | 1145 | fl6.flowlabel |= ip6_flowlabel(ipv6h); |
d24f22f3 ED |
1146 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
1147 | fl6.flowi6_mark = skb->mark; | |
61ec2aec | 1148 | |
4c9483b2 | 1149 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); |
61ec2aec YK |
1150 | if (err != 0) { |
1151 | if (err == -EMSGSIZE) | |
3ffe533c | 1152 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
61ec2aec YK |
1153 | return -1; |
1154 | } | |
1155 | ||
1156 | return 0; | |
1157 | } | |
1158 | ||
6fef4c0c | 1159 | static netdev_tx_t |
61ec2aec YK |
1160 | ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) |
1161 | { | |
1162 | struct ip6_tnl *t = netdev_priv(dev); | |
3dca02af | 1163 | struct net_device_stats *stats = &t->dev->stats; |
61ec2aec YK |
1164 | int ret; |
1165 | ||
61ec2aec | 1166 | switch (skb->protocol) { |
60678040 | 1167 | case htons(ETH_P_IP): |
c4d3efaf YK |
1168 | ret = ip4ip6_tnl_xmit(skb, dev); |
1169 | break; | |
60678040 | 1170 | case htons(ETH_P_IPV6): |
61ec2aec YK |
1171 | ret = ip6ip6_tnl_xmit(skb, dev); |
1172 | break; | |
1173 | default: | |
1174 | goto tx_err; | |
1175 | } | |
1176 | ||
1177 | if (ret < 0) | |
1178 | goto tx_err; | |
1179 | ||
6ed10654 | 1180 | return NETDEV_TX_OK; |
61ec2aec | 1181 | |
1da177e4 LT |
1182 | tx_err: |
1183 | stats->tx_errors++; | |
1184 | stats->tx_dropped++; | |
1185 | kfree_skb(skb); | |
6ed10654 | 1186 | return NETDEV_TX_OK; |
1da177e4 LT |
1187 | } |
1188 | ||
3144581c | 1189 | static void ip6_tnl_link_config(struct ip6_tnl *t) |
1da177e4 LT |
1190 | { |
1191 | struct net_device *dev = t->dev; | |
c12b395a | 1192 | struct __ip6_tnl_parm *p = &t->parms; |
4c9483b2 | 1193 | struct flowi6 *fl6 = &t->fl.u.ip6; |
1da177e4 | 1194 | |
3a6d54c5 JP |
1195 | memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); |
1196 | memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
1da177e4 LT |
1197 | |
1198 | /* Set up flowi template */ | |
4e3fd7a0 AD |
1199 | fl6->saddr = p->laddr; |
1200 | fl6->daddr = p->raddr; | |
4c9483b2 DM |
1201 | fl6->flowi6_oif = p->link; |
1202 | fl6->flowlabel = 0; | |
1da177e4 LT |
1203 | |
1204 | if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) | |
4c9483b2 | 1205 | fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; |
1da177e4 | 1206 | if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) |
4c9483b2 | 1207 | fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; |
1da177e4 | 1208 | |
d0087b29 VN |
1209 | p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); |
1210 | p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); | |
1da177e4 LT |
1211 | |
1212 | if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) | |
1213 | dev->flags |= IFF_POINTOPOINT; | |
1214 | else | |
1215 | dev->flags &= ~IFF_POINTOPOINT; | |
1216 | ||
1217 | dev->iflink = p->link; | |
1218 | ||
1219 | if (p->flags & IP6_TNL_F_CAP_XMIT) { | |
305d4b3c VN |
1220 | int strict = (ipv6_addr_type(&p->raddr) & |
1221 | (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); | |
1222 | ||
0bd87628 | 1223 | struct rt6_info *rt = rt6_lookup(t->net, |
2f7f54b7 | 1224 | &p->raddr, &p->laddr, |
305d4b3c | 1225 | p->link, strict); |
1da177e4 LT |
1226 | |
1227 | if (rt == NULL) | |
1228 | return; | |
1229 | ||
d1918542 DM |
1230 | if (rt->dst.dev) { |
1231 | dev->hard_header_len = rt->dst.dev->hard_header_len + | |
1da177e4 LT |
1232 | sizeof (struct ipv6hdr); |
1233 | ||
d1918542 | 1234 | dev->mtu = rt->dst.dev->mtu - sizeof (struct ipv6hdr); |
381601e5 AF |
1235 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
1236 | dev->mtu-=8; | |
1da177e4 LT |
1237 | |
1238 | if (dev->mtu < IPV6_MIN_MTU) | |
1239 | dev->mtu = IPV6_MIN_MTU; | |
1240 | } | |
94e187c0 | 1241 | ip6_rt_put(rt); |
1da177e4 LT |
1242 | } |
1243 | } | |
1244 | ||
1245 | /** | |
3144581c | 1246 | * ip6_tnl_change - update the tunnel parameters |
1da177e4 LT |
1247 | * @t: tunnel to be changed |
1248 | * @p: tunnel configuration parameters | |
1da177e4 LT |
1249 | * |
1250 | * Description: | |
3144581c | 1251 | * ip6_tnl_change() updates the tunnel parameters |
1da177e4 LT |
1252 | **/ |
1253 | ||
1254 | static int | |
c12b395a | 1255 | ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) |
1da177e4 | 1256 | { |
4e3fd7a0 AD |
1257 | t->parms.laddr = p->laddr; |
1258 | t->parms.raddr = p->raddr; | |
1da177e4 LT |
1259 | t->parms.flags = p->flags; |
1260 | t->parms.hop_limit = p->hop_limit; | |
1261 | t->parms.encap_limit = p->encap_limit; | |
1262 | t->parms.flowinfo = p->flowinfo; | |
8181b8c1 | 1263 | t->parms.link = p->link; |
502b0935 | 1264 | t->parms.proto = p->proto; |
0c088890 | 1265 | ip6_tnl_dst_reset(t); |
3144581c | 1266 | ip6_tnl_link_config(t); |
1da177e4 LT |
1267 | return 0; |
1268 | } | |
1269 | ||
0b112457 ND |
1270 | static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) |
1271 | { | |
0bd87628 | 1272 | struct net *net = t->net; |
0b112457 ND |
1273 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1274 | int err; | |
1275 | ||
1276 | ip6_tnl_unlink(ip6n, t); | |
1277 | synchronize_net(); | |
1278 | err = ip6_tnl_change(t, p); | |
1279 | ip6_tnl_link(ip6n, t); | |
1280 | netdev_state_change(t->dev); | |
1281 | return err; | |
1282 | } | |
1283 | ||
c12b395a | 1284 | static void |
1285 | ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u) | |
1286 | { | |
1287 | p->laddr = u->laddr; | |
1288 | p->raddr = u->raddr; | |
1289 | p->flags = u->flags; | |
1290 | p->hop_limit = u->hop_limit; | |
1291 | p->encap_limit = u->encap_limit; | |
1292 | p->flowinfo = u->flowinfo; | |
1293 | p->link = u->link; | |
1294 | p->proto = u->proto; | |
1295 | memcpy(p->name, u->name, sizeof(u->name)); | |
1296 | } | |
1297 | ||
1298 | static void | |
1299 | ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p) | |
1300 | { | |
1301 | u->laddr = p->laddr; | |
1302 | u->raddr = p->raddr; | |
1303 | u->flags = p->flags; | |
1304 | u->hop_limit = p->hop_limit; | |
1305 | u->encap_limit = p->encap_limit; | |
1306 | u->flowinfo = p->flowinfo; | |
1307 | u->link = p->link; | |
1308 | u->proto = p->proto; | |
1309 | memcpy(u->name, p->name, sizeof(u->name)); | |
1310 | } | |
1311 | ||
1da177e4 | 1312 | /** |
3144581c | 1313 | * ip6_tnl_ioctl - configure ipv6 tunnels from userspace |
1da177e4 LT |
1314 | * @dev: virtual device associated with tunnel |
1315 | * @ifr: parameters passed from userspace | |
1316 | * @cmd: command to be performed | |
1317 | * | |
1318 | * Description: | |
3144581c | 1319 | * ip6_tnl_ioctl() is used for managing IPv6 tunnels |
1ab1457c | 1320 | * from userspace. |
1da177e4 LT |
1321 | * |
1322 | * The possible commands are the following: | |
1323 | * %SIOCGETTUNNEL: get tunnel parameters for device | |
1324 | * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters | |
1325 | * %SIOCCHGTUNNEL: change tunnel parameters to those given | |
1326 | * %SIOCDELTUNNEL: delete tunnel | |
1327 | * | |
1ab1457c | 1328 | * The fallback device "ip6tnl0", created during module |
1da177e4 LT |
1329 | * initialization, can be used for creating other tunnel devices. |
1330 | * | |
1331 | * Return: | |
1332 | * 0 on success, | |
1333 | * %-EFAULT if unable to copy data to or from userspace, | |
1334 | * %-EPERM if current process hasn't %CAP_NET_ADMIN set | |
1335 | * %-EINVAL if passed tunnel parameters are invalid, | |
1336 | * %-EEXIST if changing a tunnel's parameters would cause a conflict | |
1337 | * %-ENODEV if attempting to change or delete a nonexisting device | |
1338 | **/ | |
1339 | ||
1340 | static int | |
3144581c | 1341 | ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
1da177e4 LT |
1342 | { |
1343 | int err = 0; | |
1da177e4 | 1344 | struct ip6_tnl_parm p; |
c12b395a | 1345 | struct __ip6_tnl_parm p1; |
74462f0d ND |
1346 | struct ip6_tnl *t = netdev_priv(dev); |
1347 | struct net *net = t->net; | |
2dd02c89 | 1348 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 LT |
1349 | |
1350 | switch (cmd) { | |
1351 | case SIOCGETTUNNEL: | |
15820e12 | 1352 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 | 1353 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) { |
1da177e4 LT |
1354 | err = -EFAULT; |
1355 | break; | |
1356 | } | |
c12b395a | 1357 | ip6_tnl_parm_from_user(&p1, &p); |
1358 | t = ip6_tnl_locate(net, &p1, 0); | |
74462f0d ND |
1359 | if (t == NULL) |
1360 | t = netdev_priv(dev); | |
5ef5d6c5 DC |
1361 | } else { |
1362 | memset(&p, 0, sizeof(p)); | |
567131a7 | 1363 | } |
c12b395a | 1364 | ip6_tnl_parm_to_user(&p, &t->parms); |
1da177e4 LT |
1365 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) { |
1366 | err = -EFAULT; | |
1367 | } | |
1368 | break; | |
1369 | case SIOCADDTUNNEL: | |
1370 | case SIOCCHGTUNNEL: | |
1371 | err = -EPERM; | |
af31f412 | 1372 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 1373 | break; |
567131a7 VN |
1374 | err = -EFAULT; |
1375 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1376 | break; |
567131a7 | 1377 | err = -EINVAL; |
502b0935 YK |
1378 | if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && |
1379 | p.proto != 0) | |
1da177e4 | 1380 | break; |
c12b395a | 1381 | ip6_tnl_parm_from_user(&p1, &p); |
1382 | t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL); | |
15820e12 | 1383 | if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) { |
567131a7 VN |
1384 | if (t != NULL) { |
1385 | if (t->dev != dev) { | |
1386 | err = -EEXIST; | |
1387 | break; | |
1388 | } | |
1389 | } else | |
1390 | t = netdev_priv(dev); | |
1391 | ||
0b112457 | 1392 | err = ip6_tnl_update(t, &p1); |
1da177e4 | 1393 | } |
567131a7 | 1394 | if (t) { |
1da177e4 | 1395 | err = 0; |
c12b395a | 1396 | ip6_tnl_parm_to_user(&p, &t->parms); |
1397 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
567131a7 VN |
1398 | err = -EFAULT; |
1399 | ||
1400 | } else | |
1401 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1da177e4 LT |
1402 | break; |
1403 | case SIOCDELTUNNEL: | |
1404 | err = -EPERM; | |
af31f412 | 1405 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1406 | break; |
1407 | ||
15820e12 | 1408 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 VN |
1409 | err = -EFAULT; |
1410 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1411 | break; |
567131a7 | 1412 | err = -ENOENT; |
c12b395a | 1413 | ip6_tnl_parm_from_user(&p1, &p); |
1414 | t = ip6_tnl_locate(net, &p1, 0); | |
1415 | if (t == NULL) | |
1da177e4 | 1416 | break; |
567131a7 | 1417 | err = -EPERM; |
15820e12 | 1418 | if (t->dev == ip6n->fb_tnl_dev) |
1da177e4 | 1419 | break; |
567131a7 | 1420 | dev = t->dev; |
1da177e4 | 1421 | } |
22f8cde5 SH |
1422 | err = 0; |
1423 | unregister_netdevice(dev); | |
1da177e4 LT |
1424 | break; |
1425 | default: | |
1426 | err = -EINVAL; | |
1427 | } | |
1428 | return err; | |
1429 | } | |
1430 | ||
1da177e4 | 1431 | /** |
3144581c | 1432 | * ip6_tnl_change_mtu - change mtu manually for tunnel device |
1da177e4 LT |
1433 | * @dev: virtual device associated with tunnel |
1434 | * @new_mtu: the new mtu | |
1435 | * | |
1436 | * Return: | |
1437 | * 0 on success, | |
1438 | * %-EINVAL if mtu too small | |
1439 | **/ | |
1440 | ||
1441 | static int | |
3144581c | 1442 | ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) |
1da177e4 | 1443 | { |
582442d6 OG |
1444 | struct ip6_tnl *tnl = netdev_priv(dev); |
1445 | ||
1446 | if (tnl->parms.proto == IPPROTO_IPIP) { | |
1447 | if (new_mtu < 68) | |
1448 | return -EINVAL; | |
1449 | } else { | |
1450 | if (new_mtu < IPV6_MIN_MTU) | |
1451 | return -EINVAL; | |
1da177e4 | 1452 | } |
582442d6 OG |
1453 | if (new_mtu > 0xFFF8 - dev->hard_header_len) |
1454 | return -EINVAL; | |
1da177e4 LT |
1455 | dev->mtu = new_mtu; |
1456 | return 0; | |
1457 | } | |
1458 | ||
1326c3d5 SH |
1459 | |
1460 | static const struct net_device_ops ip6_tnl_netdev_ops = { | |
8560f226 | 1461 | .ndo_uninit = ip6_tnl_dev_uninit, |
1326c3d5 | 1462 | .ndo_start_xmit = ip6_tnl_xmit, |
8560f226 | 1463 | .ndo_do_ioctl = ip6_tnl_ioctl, |
1326c3d5 | 1464 | .ndo_change_mtu = ip6_tnl_change_mtu, |
8560f226 | 1465 | .ndo_get_stats = ip6_get_stats, |
1326c3d5 SH |
1466 | }; |
1467 | ||
8560f226 | 1468 | |
1da177e4 | 1469 | /** |
3144581c | 1470 | * ip6_tnl_dev_setup - setup virtual tunnel device |
1da177e4 LT |
1471 | * @dev: virtual device associated with tunnel |
1472 | * | |
1473 | * Description: | |
1474 | * Initialize function pointers and device parameters | |
1475 | **/ | |
1476 | ||
3144581c | 1477 | static void ip6_tnl_dev_setup(struct net_device *dev) |
1da177e4 | 1478 | { |
381601e5 AF |
1479 | struct ip6_tnl *t; |
1480 | ||
1326c3d5 | 1481 | dev->netdev_ops = &ip6_tnl_netdev_ops; |
8560f226 | 1482 | dev->destructor = ip6_dev_free; |
1da177e4 LT |
1483 | |
1484 | dev->type = ARPHRD_TUNNEL6; | |
1485 | dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr); | |
1486 | dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr); | |
381601e5 AF |
1487 | t = netdev_priv(dev); |
1488 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1489 | dev->mtu-=8; | |
1da177e4 LT |
1490 | dev->flags |= IFF_NOARP; |
1491 | dev->addr_len = sizeof(struct in6_addr); | |
7e223de8 | 1492 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
e837735e ND |
1493 | /* This perm addr will be used as interface identifier by IPv6 */ |
1494 | dev->addr_assign_type = NET_ADDR_RANDOM; | |
1495 | eth_random_addr(dev->perm_addr); | |
1da177e4 LT |
1496 | } |
1497 | ||
1498 | ||
1499 | /** | |
3144581c | 1500 | * ip6_tnl_dev_init_gen - general initializer for all tunnel devices |
1da177e4 LT |
1501 | * @dev: virtual device associated with tunnel |
1502 | **/ | |
1503 | ||
8560f226 | 1504 | static inline int |
3144581c | 1505 | ip6_tnl_dev_init_gen(struct net_device *dev) |
1da177e4 | 1506 | { |
2941a486 | 1507 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 | 1508 | |
1da177e4 | 1509 | t->dev = dev; |
0bd87628 | 1510 | t->net = dev_net(dev); |
1c213bd2 | 1511 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
8560f226 ED |
1512 | if (!dev->tstats) |
1513 | return -ENOMEM; | |
1514 | return 0; | |
1da177e4 LT |
1515 | } |
1516 | ||
1517 | /** | |
3144581c | 1518 | * ip6_tnl_dev_init - initializer for all non fallback tunnel devices |
1da177e4 LT |
1519 | * @dev: virtual device associated with tunnel |
1520 | **/ | |
1521 | ||
8560f226 | 1522 | static int ip6_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1523 | { |
2941a486 | 1524 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 ED |
1525 | int err = ip6_tnl_dev_init_gen(dev); |
1526 | ||
1527 | if (err) | |
1528 | return err; | |
3144581c | 1529 | ip6_tnl_link_config(t); |
8560f226 | 1530 | return 0; |
1da177e4 LT |
1531 | } |
1532 | ||
1533 | /** | |
3144581c | 1534 | * ip6_fb_tnl_dev_init - initializer for fallback tunnel device |
1da177e4 LT |
1535 | * @dev: fallback device |
1536 | * | |
1537 | * Return: 0 | |
1538 | **/ | |
1539 | ||
8560f226 | 1540 | static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1541 | { |
2941a486 | 1542 | struct ip6_tnl *t = netdev_priv(dev); |
3e6c9fb5 PE |
1543 | struct net *net = dev_net(dev); |
1544 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
8560f226 ED |
1545 | int err = ip6_tnl_dev_init_gen(dev); |
1546 | ||
1547 | if (err) | |
1548 | return err; | |
3e6c9fb5 | 1549 | |
502b0935 | 1550 | t->parms.proto = IPPROTO_IPV6; |
1da177e4 | 1551 | dev_hold(dev); |
d0087b29 VN |
1552 | |
1553 | ip6_tnl_link_config(t); | |
1554 | ||
cf778b00 | 1555 | rcu_assign_pointer(ip6n->tnls_wc[0], t); |
8560f226 | 1556 | return 0; |
1da177e4 LT |
1557 | } |
1558 | ||
0b112457 ND |
1559 | static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[]) |
1560 | { | |
1561 | u8 proto; | |
1562 | ||
c8965932 | 1563 | if (!data || !data[IFLA_IPTUN_PROTO]) |
0b112457 ND |
1564 | return 0; |
1565 | ||
1566 | proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1567 | if (proto != IPPROTO_IPV6 && | |
1568 | proto != IPPROTO_IPIP && | |
1569 | proto != 0) | |
1570 | return -EINVAL; | |
1571 | ||
1572 | return 0; | |
1573 | } | |
1574 | ||
1575 | static void ip6_tnl_netlink_parms(struct nlattr *data[], | |
1576 | struct __ip6_tnl_parm *parms) | |
1577 | { | |
1578 | memset(parms, 0, sizeof(*parms)); | |
1579 | ||
1580 | if (!data) | |
1581 | return; | |
1582 | ||
1583 | if (data[IFLA_IPTUN_LINK]) | |
1584 | parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); | |
1585 | ||
1586 | if (data[IFLA_IPTUN_LOCAL]) | |
1587 | nla_memcpy(&parms->laddr, data[IFLA_IPTUN_LOCAL], | |
1588 | sizeof(struct in6_addr)); | |
1589 | ||
1590 | if (data[IFLA_IPTUN_REMOTE]) | |
1591 | nla_memcpy(&parms->raddr, data[IFLA_IPTUN_REMOTE], | |
1592 | sizeof(struct in6_addr)); | |
1593 | ||
1594 | if (data[IFLA_IPTUN_TTL]) | |
1595 | parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]); | |
1596 | ||
1597 | if (data[IFLA_IPTUN_ENCAP_LIMIT]) | |
1598 | parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]); | |
1599 | ||
1600 | if (data[IFLA_IPTUN_FLOWINFO]) | |
1ff05fb7 | 1601 | parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]); |
0b112457 ND |
1602 | |
1603 | if (data[IFLA_IPTUN_FLAGS]) | |
1604 | parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]); | |
1605 | ||
1606 | if (data[IFLA_IPTUN_PROTO]) | |
1607 | parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1608 | } | |
1609 | ||
1610 | static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev, | |
1611 | struct nlattr *tb[], struct nlattr *data[]) | |
1612 | { | |
1613 | struct net *net = dev_net(dev); | |
1614 | struct ip6_tnl *nt; | |
1615 | ||
1616 | nt = netdev_priv(dev); | |
1617 | ip6_tnl_netlink_parms(data, &nt->parms); | |
1618 | ||
1619 | if (ip6_tnl_locate(net, &nt->parms, 0)) | |
1620 | return -EEXIST; | |
1621 | ||
1622 | return ip6_tnl_create2(dev); | |
1623 | } | |
1624 | ||
1625 | static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[], | |
1626 | struct nlattr *data[]) | |
1627 | { | |
0bd87628 | 1628 | struct ip6_tnl *t = netdev_priv(dev); |
0b112457 | 1629 | struct __ip6_tnl_parm p; |
0bd87628 | 1630 | struct net *net = t->net; |
0b112457 ND |
1631 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1632 | ||
1633 | if (dev == ip6n->fb_tnl_dev) | |
1634 | return -EINVAL; | |
1635 | ||
1636 | ip6_tnl_netlink_parms(data, &p); | |
1637 | ||
1638 | t = ip6_tnl_locate(net, &p, 0); | |
1639 | ||
1640 | if (t) { | |
1641 | if (t->dev != dev) | |
1642 | return -EEXIST; | |
1643 | } else | |
1644 | t = netdev_priv(dev); | |
1645 | ||
1646 | return ip6_tnl_update(t, &p); | |
1647 | } | |
1648 | ||
1e9f3d6f ND |
1649 | static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head) |
1650 | { | |
1651 | struct net *net = dev_net(dev); | |
1652 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1653 | ||
1654 | if (dev != ip6n->fb_tnl_dev) | |
1655 | unregister_netdevice_queue(dev, head); | |
1656 | } | |
1657 | ||
b58d731a | 1658 | static size_t ip6_tnl_get_size(const struct net_device *dev) |
c075b130 ND |
1659 | { |
1660 | return | |
1661 | /* IFLA_IPTUN_LINK */ | |
1662 | nla_total_size(4) + | |
1663 | /* IFLA_IPTUN_LOCAL */ | |
1664 | nla_total_size(sizeof(struct in6_addr)) + | |
1665 | /* IFLA_IPTUN_REMOTE */ | |
1666 | nla_total_size(sizeof(struct in6_addr)) + | |
1667 | /* IFLA_IPTUN_TTL */ | |
1668 | nla_total_size(1) + | |
1669 | /* IFLA_IPTUN_ENCAP_LIMIT */ | |
1670 | nla_total_size(1) + | |
1671 | /* IFLA_IPTUN_FLOWINFO */ | |
1672 | nla_total_size(4) + | |
1673 | /* IFLA_IPTUN_FLAGS */ | |
1674 | nla_total_size(4) + | |
cfa323b6 ND |
1675 | /* IFLA_IPTUN_PROTO */ |
1676 | nla_total_size(1) + | |
c075b130 ND |
1677 | 0; |
1678 | } | |
1679 | ||
b58d731a | 1680 | static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev) |
c075b130 ND |
1681 | { |
1682 | struct ip6_tnl *tunnel = netdev_priv(dev); | |
1683 | struct __ip6_tnl_parm *parm = &tunnel->parms; | |
1684 | ||
1685 | if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || | |
1686 | nla_put(skb, IFLA_IPTUN_LOCAL, sizeof(struct in6_addr), | |
c075b130 | 1687 | &parm->laddr) || |
0d2ede92 DZ |
1688 | nla_put(skb, IFLA_IPTUN_REMOTE, sizeof(struct in6_addr), |
1689 | &parm->raddr) || | |
c075b130 ND |
1690 | nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) || |
1691 | nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) || | |
1692 | nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) || | |
cfa323b6 ND |
1693 | nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) || |
1694 | nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto)) | |
c075b130 ND |
1695 | goto nla_put_failure; |
1696 | return 0; | |
1697 | ||
1698 | nla_put_failure: | |
1699 | return -EMSGSIZE; | |
1700 | } | |
1701 | ||
0b112457 ND |
1702 | static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = { |
1703 | [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, | |
1704 | [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) }, | |
1705 | [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) }, | |
1706 | [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, | |
1707 | [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 }, | |
1708 | [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 }, | |
1709 | [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 }, | |
1710 | [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, | |
1711 | }; | |
1712 | ||
c075b130 ND |
1713 | static struct rtnl_link_ops ip6_link_ops __read_mostly = { |
1714 | .kind = "ip6tnl", | |
1715 | .maxtype = IFLA_IPTUN_MAX, | |
0b112457 | 1716 | .policy = ip6_tnl_policy, |
c075b130 | 1717 | .priv_size = sizeof(struct ip6_tnl), |
0b112457 ND |
1718 | .setup = ip6_tnl_dev_setup, |
1719 | .validate = ip6_tnl_validate, | |
1720 | .newlink = ip6_tnl_newlink, | |
1721 | .changelink = ip6_tnl_changelink, | |
1e9f3d6f | 1722 | .dellink = ip6_tnl_dellink, |
b58d731a ND |
1723 | .get_size = ip6_tnl_get_size, |
1724 | .fill_info = ip6_tnl_fill_info, | |
c075b130 ND |
1725 | }; |
1726 | ||
3ff2cfa5 | 1727 | static struct xfrm6_tunnel ip4ip6_handler __read_mostly = { |
c4d3efaf YK |
1728 | .handler = ip4ip6_rcv, |
1729 | .err_handler = ip4ip6_err, | |
1730 | .priority = 1, | |
1731 | }; | |
1732 | ||
3ff2cfa5 | 1733 | static struct xfrm6_tunnel ip6ip6_handler __read_mostly = { |
0303770d PM |
1734 | .handler = ip6ip6_rcv, |
1735 | .err_handler = ip6ip6_err, | |
d2acc347 | 1736 | .priority = 1, |
1da177e4 LT |
1737 | }; |
1738 | ||
1e9f3d6f | 1739 | static void __net_exit ip6_tnl_destroy_tunnels(struct net *net) |
3e6c9fb5 | 1740 | { |
1e9f3d6f | 1741 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
0bd87628 | 1742 | struct net_device *dev, *aux; |
3e6c9fb5 PE |
1743 | int h; |
1744 | struct ip6_tnl *t; | |
cf4432f5 | 1745 | LIST_HEAD(list); |
3e6c9fb5 | 1746 | |
0bd87628 ND |
1747 | for_each_netdev_safe(net, dev, aux) |
1748 | if (dev->rtnl_link_ops == &ip6_link_ops) | |
1749 | unregister_netdevice_queue(dev, &list); | |
1750 | ||
3e6c9fb5 | 1751 | for (h = 0; h < HASH_SIZE; h++) { |
94767632 | 1752 | t = rtnl_dereference(ip6n->tnls_r_l[h]); |
cf4432f5 | 1753 | while (t != NULL) { |
0bd87628 ND |
1754 | /* If dev is in the same netns, it has already |
1755 | * been added to the list by the previous loop. | |
1756 | */ | |
1757 | if (!net_eq(dev_net(t->dev), net)) | |
1758 | unregister_netdevice_queue(t->dev, &list); | |
94767632 | 1759 | t = rtnl_dereference(t->next); |
cf4432f5 | 1760 | } |
3e6c9fb5 PE |
1761 | } |
1762 | ||
cf4432f5 | 1763 | unregister_netdevice_many(&list); |
3e6c9fb5 PE |
1764 | } |
1765 | ||
2c8c1e72 | 1766 | static int __net_init ip6_tnl_init_net(struct net *net) |
13eeb8e9 | 1767 | { |
ac31cd3c | 1768 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
731abb9c | 1769 | struct ip6_tnl *t = NULL; |
13eeb8e9 | 1770 | int err; |
13eeb8e9 | 1771 | |
3e6c9fb5 PE |
1772 | ip6n->tnls[0] = ip6n->tnls_wc; |
1773 | ip6n->tnls[1] = ip6n->tnls_r_l; | |
1774 | ||
15820e12 PE |
1775 | err = -ENOMEM; |
1776 | ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", | |
c835a677 | 1777 | NET_NAME_UNKNOWN, ip6_tnl_dev_setup); |
15820e12 PE |
1778 | |
1779 | if (!ip6n->fb_tnl_dev) | |
1780 | goto err_alloc_dev; | |
be77e593 | 1781 | dev_net_set(ip6n->fb_tnl_dev, net); |
bb814094 | 1782 | ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops; |
0bd87628 ND |
1783 | /* FB netdevice is special: we have one, and only one per netns. |
1784 | * Allowing to move it to another netns is clearly unsafe. | |
1785 | */ | |
1786 | ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL; | |
15820e12 | 1787 | |
8560f226 ED |
1788 | err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); |
1789 | if (err < 0) | |
1790 | goto err_register; | |
15820e12 PE |
1791 | |
1792 | err = register_netdev(ip6n->fb_tnl_dev); | |
1793 | if (err < 0) | |
1794 | goto err_register; | |
731abb9c JB |
1795 | |
1796 | t = netdev_priv(ip6n->fb_tnl_dev); | |
1797 | ||
1798 | strcpy(t->parms.name, ip6n->fb_tnl_dev->name); | |
13eeb8e9 PE |
1799 | return 0; |
1800 | ||
15820e12 | 1801 | err_register: |
8560f226 | 1802 | ip6_dev_free(ip6n->fb_tnl_dev); |
15820e12 | 1803 | err_alloc_dev: |
13eeb8e9 PE |
1804 | return err; |
1805 | } | |
1806 | ||
2c8c1e72 | 1807 | static void __net_exit ip6_tnl_exit_net(struct net *net) |
13eeb8e9 | 1808 | { |
3e6c9fb5 | 1809 | rtnl_lock(); |
1e9f3d6f | 1810 | ip6_tnl_destroy_tunnels(net); |
3e6c9fb5 | 1811 | rtnl_unlock(); |
13eeb8e9 PE |
1812 | } |
1813 | ||
1814 | static struct pernet_operations ip6_tnl_net_ops = { | |
1815 | .init = ip6_tnl_init_net, | |
1816 | .exit = ip6_tnl_exit_net, | |
ac31cd3c EB |
1817 | .id = &ip6_tnl_net_id, |
1818 | .size = sizeof(struct ip6_tnl_net), | |
13eeb8e9 PE |
1819 | }; |
1820 | ||
1da177e4 LT |
1821 | /** |
1822 | * ip6_tunnel_init - register protocol and reserve needed resources | |
1823 | * | |
1824 | * Return: 0 on success | |
1825 | **/ | |
1826 | ||
1827 | static int __init ip6_tunnel_init(void) | |
1828 | { | |
1829 | int err; | |
1830 | ||
d5aa407f AD |
1831 | err = register_pernet_device(&ip6_tnl_net_ops); |
1832 | if (err < 0) | |
1833 | goto out_pernet; | |
1834 | ||
1835 | err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET); | |
1836 | if (err < 0) { | |
f3213831 | 1837 | pr_err("%s: can't register ip4ip6\n", __func__); |
d5aa407f | 1838 | goto out_ip4ip6; |
c4d3efaf YK |
1839 | } |
1840 | ||
d5aa407f AD |
1841 | err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6); |
1842 | if (err < 0) { | |
f3213831 | 1843 | pr_err("%s: can't register ip6ip6\n", __func__); |
d5aa407f | 1844 | goto out_ip6ip6; |
1da177e4 | 1845 | } |
c075b130 ND |
1846 | err = rtnl_link_register(&ip6_link_ops); |
1847 | if (err < 0) | |
1848 | goto rtnl_link_failed; | |
13eeb8e9 | 1849 | |
1da177e4 | 1850 | return 0; |
d5aa407f | 1851 | |
c075b130 ND |
1852 | rtnl_link_failed: |
1853 | xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6); | |
d5aa407f | 1854 | out_ip6ip6: |
c4d3efaf | 1855 | xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); |
d5aa407f AD |
1856 | out_ip4ip6: |
1857 | unregister_pernet_device(&ip6_tnl_net_ops); | |
1858 | out_pernet: | |
1da177e4 LT |
1859 | return err; |
1860 | } | |
1861 | ||
1862 | /** | |
1863 | * ip6_tunnel_cleanup - free resources and unregister protocol | |
1864 | **/ | |
1865 | ||
1866 | static void __exit ip6_tunnel_cleanup(void) | |
1867 | { | |
c075b130 | 1868 | rtnl_link_unregister(&ip6_link_ops); |
c4d3efaf | 1869 | if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) |
f3213831 | 1870 | pr_info("%s: can't deregister ip4ip6\n", __func__); |
c4d3efaf | 1871 | |
73d605d1 | 1872 | if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) |
f3213831 | 1873 | pr_info("%s: can't deregister ip6ip6\n", __func__); |
1da177e4 | 1874 | |
ac31cd3c | 1875 | unregister_pernet_device(&ip6_tnl_net_ops); |
1da177e4 LT |
1876 | } |
1877 | ||
1878 | module_init(ip6_tunnel_init); | |
1879 | module_exit(ip6_tunnel_cleanup); |