]>
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) && |
2b0bb01b SK |
367 | ipv6_addr_equal(remote, &t->parms.raddr)) { |
368 | if (create) | |
369 | return NULL; | |
370 | ||
567131a7 | 371 | return t; |
2b0bb01b | 372 | } |
1da177e4 LT |
373 | } |
374 | if (!create) | |
567131a7 | 375 | return NULL; |
2dd02c89 | 376 | return ip6_tnl_create(net, p); |
1da177e4 LT |
377 | } |
378 | ||
379 | /** | |
3144581c | 380 | * ip6_tnl_dev_uninit - tunnel device uninitializer |
1da177e4 | 381 | * @dev: the device to be destroyed |
1ab1457c | 382 | * |
1da177e4 | 383 | * Description: |
3144581c | 384 | * ip6_tnl_dev_uninit() removes tunnel from its list |
1da177e4 LT |
385 | **/ |
386 | ||
387 | static void | |
3144581c | 388 | ip6_tnl_dev_uninit(struct net_device *dev) |
1da177e4 | 389 | { |
2941a486 | 390 | struct ip6_tnl *t = netdev_priv(dev); |
0bd87628 | 391 | struct net *net = t->net; |
2dd02c89 | 392 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 393 | |
94767632 | 394 | if (dev == ip6n->fb_tnl_dev) |
a9b3cd7f | 395 | RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL); |
94767632 | 396 | else |
2dd02c89 | 397 | ip6_tnl_unlink(ip6n, t); |
1da177e4 LT |
398 | ip6_tnl_dst_reset(t); |
399 | dev_put(dev); | |
400 | } | |
401 | ||
402 | /** | |
403 | * parse_tvl_tnl_enc_lim - handle encapsulation limit option | |
404 | * @skb: received socket buffer | |
405 | * | |
1ab1457c YH |
406 | * Return: |
407 | * 0 if none was found, | |
1da177e4 LT |
408 | * else index to encapsulation limit |
409 | **/ | |
410 | ||
c12b395a | 411 | __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw) |
1da177e4 | 412 | { |
b71d1d42 | 413 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw; |
1da177e4 | 414 | __u8 nexthdr = ipv6h->nexthdr; |
67ba4152 | 415 | __u16 off = sizeof(*ipv6h); |
1da177e4 LT |
416 | |
417 | while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { | |
418 | __u16 optlen = 0; | |
419 | struct ipv6_opt_hdr *hdr; | |
67ba4152 | 420 | if (raw + off + sizeof(*hdr) > skb->data && |
1da177e4 LT |
421 | !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr))) |
422 | break; | |
423 | ||
424 | hdr = (struct ipv6_opt_hdr *) (raw + off); | |
425 | if (nexthdr == NEXTHDR_FRAGMENT) { | |
426 | struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; | |
427 | if (frag_hdr->frag_off) | |
428 | break; | |
429 | optlen = 8; | |
430 | } else if (nexthdr == NEXTHDR_AUTH) { | |
431 | optlen = (hdr->hdrlen + 2) << 2; | |
432 | } else { | |
433 | optlen = ipv6_optlen(hdr); | |
434 | } | |
435 | if (nexthdr == NEXTHDR_DEST) { | |
436 | __u16 i = off + 2; | |
437 | while (1) { | |
438 | struct ipv6_tlv_tnl_enc_lim *tel; | |
439 | ||
440 | /* No more room for encapsulation limit */ | |
441 | if (i + sizeof (*tel) > off + optlen) | |
442 | break; | |
443 | ||
444 | tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i]; | |
445 | /* return index of option if found and valid */ | |
446 | if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && | |
447 | tel->length == 1) | |
448 | return i; | |
449 | /* else jump to next option */ | |
450 | if (tel->type) | |
451 | i += tel->length + 2; | |
452 | else | |
453 | i++; | |
454 | } | |
455 | } | |
456 | nexthdr = hdr->nexthdr; | |
457 | off += optlen; | |
458 | } | |
459 | return 0; | |
460 | } | |
c12b395a | 461 | EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim); |
1da177e4 LT |
462 | |
463 | /** | |
e490d1d8 | 464 | * ip6_tnl_err - tunnel error handler |
1da177e4 LT |
465 | * |
466 | * Description: | |
e490d1d8 | 467 | * ip6_tnl_err() should handle errors in the tunnel according |
1da177e4 LT |
468 | * to the specifications in RFC 2473. |
469 | **/ | |
470 | ||
d2acc347 | 471 | static int |
502b0935 | 472 | ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, |
d5fdd6ba | 473 | u8 *type, u8 *code, int *msg, __u32 *info, int offset) |
1da177e4 | 474 | { |
b71d1d42 | 475 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data; |
1da177e4 LT |
476 | struct ip6_tnl *t; |
477 | int rel_msg = 0; | |
d5fdd6ba BH |
478 | u8 rel_type = ICMPV6_DEST_UNREACH; |
479 | u8 rel_code = ICMPV6_ADDR_UNREACH; | |
acf722f7 | 480 | u8 tproto; |
1da177e4 LT |
481 | __u32 rel_info = 0; |
482 | __u16 len; | |
d2acc347 | 483 | int err = -ENOENT; |
1da177e4 | 484 | |
1ab1457c YH |
485 | /* If the packet doesn't contain the original IPv6 header we are |
486 | in trouble since we might need the source address for further | |
1da177e4 LT |
487 | processing of the error. */ |
488 | ||
2922bc8a | 489 | rcu_read_lock(); |
8704ca7e | 490 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, |
2dd02c89 | 491 | &ipv6h->saddr)) == NULL) |
1da177e4 LT |
492 | goto out; |
493 | ||
acf722f7 AA |
494 | tproto = ACCESS_ONCE(t->parms.proto); |
495 | if (tproto != ipproto && tproto != 0) | |
502b0935 YK |
496 | goto out; |
497 | ||
d2acc347 HX |
498 | err = 0; |
499 | ||
e490d1d8 | 500 | switch (*type) { |
1da177e4 LT |
501 | __u32 teli; |
502 | struct ipv6_tlv_tnl_enc_lim *tel; | |
503 | __u32 mtu; | |
504 | case ICMPV6_DEST_UNREACH: | |
e87cc472 JP |
505 | net_warn_ratelimited("%s: Path to destination invalid or inactive!\n", |
506 | t->parms.name); | |
1da177e4 LT |
507 | rel_msg = 1; |
508 | break; | |
509 | case ICMPV6_TIME_EXCEED: | |
e490d1d8 | 510 | if ((*code) == ICMPV6_EXC_HOPLIMIT) { |
e87cc472 JP |
511 | net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", |
512 | t->parms.name); | |
1da177e4 LT |
513 | rel_msg = 1; |
514 | } | |
515 | break; | |
516 | case ICMPV6_PARAMPROB: | |
107a5fe6 | 517 | teli = 0; |
e490d1d8 | 518 | if ((*code) == ICMPV6_HDR_FIELD) |
c12b395a | 519 | teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); |
1da177e4 | 520 | |
704eae1f | 521 | if (teli && teli == *info - 2) { |
1da177e4 LT |
522 | tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; |
523 | if (tel->encap_limit == 0) { | |
e87cc472 JP |
524 | net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", |
525 | t->parms.name); | |
1da177e4 LT |
526 | rel_msg = 1; |
527 | } | |
e87cc472 JP |
528 | } else { |
529 | net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n", | |
530 | t->parms.name); | |
1da177e4 LT |
531 | } |
532 | break; | |
533 | case ICMPV6_PKT_TOOBIG: | |
704eae1f | 534 | mtu = *info - offset; |
1da177e4 LT |
535 | if (mtu < IPV6_MIN_MTU) |
536 | mtu = IPV6_MIN_MTU; | |
537 | t->dev->mtu = mtu; | |
538 | ||
67ba4152 | 539 | if ((len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) { |
1da177e4 LT |
540 | rel_type = ICMPV6_PKT_TOOBIG; |
541 | rel_code = 0; | |
542 | rel_info = mtu; | |
543 | rel_msg = 1; | |
544 | } | |
545 | break; | |
546 | } | |
e490d1d8 YK |
547 | |
548 | *type = rel_type; | |
549 | *code = rel_code; | |
550 | *info = rel_info; | |
551 | *msg = rel_msg; | |
552 | ||
553 | out: | |
2922bc8a | 554 | rcu_read_unlock(); |
e490d1d8 YK |
555 | return err; |
556 | } | |
557 | ||
c4d3efaf YK |
558 | static int |
559 | ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 560 | u8 type, u8 code, int offset, __be32 info) |
c4d3efaf YK |
561 | { |
562 | int rel_msg = 0; | |
d5fdd6ba BH |
563 | u8 rel_type = type; |
564 | u8 rel_code = code; | |
704eae1f | 565 | __u32 rel_info = ntohl(info); |
c4d3efaf YK |
566 | int err; |
567 | struct sk_buff *skb2; | |
b71d1d42 | 568 | const struct iphdr *eiph; |
c4d3efaf | 569 | struct rtable *rt; |
31e4543d | 570 | struct flowi4 fl4; |
c4d3efaf | 571 | |
502b0935 YK |
572 | err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, |
573 | &rel_msg, &rel_info, offset); | |
c4d3efaf YK |
574 | if (err < 0) |
575 | return err; | |
576 | ||
577 | if (rel_msg == 0) | |
578 | return 0; | |
579 | ||
580 | switch (rel_type) { | |
581 | case ICMPV6_DEST_UNREACH: | |
582 | if (rel_code != ICMPV6_ADDR_UNREACH) | |
583 | return 0; | |
584 | rel_type = ICMP_DEST_UNREACH; | |
585 | rel_code = ICMP_HOST_UNREACH; | |
586 | break; | |
587 | case ICMPV6_PKT_TOOBIG: | |
588 | if (rel_code != 0) | |
589 | return 0; | |
590 | rel_type = ICMP_DEST_UNREACH; | |
591 | rel_code = ICMP_FRAG_NEEDED; | |
592 | break; | |
ec18d9a2 DM |
593 | case NDISC_REDIRECT: |
594 | rel_type = ICMP_REDIRECT; | |
595 | rel_code = ICMP_REDIR_HOST; | |
c4d3efaf YK |
596 | default: |
597 | return 0; | |
598 | } | |
599 | ||
600 | if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) | |
601 | return 0; | |
602 | ||
603 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
604 | if (!skb2) | |
605 | return 0; | |
606 | ||
adf30907 ED |
607 | skb_dst_drop(skb2); |
608 | ||
c4d3efaf | 609 | skb_pull(skb2, offset); |
c1d2bbe1 | 610 | skb_reset_network_header(skb2); |
eddc9ec5 | 611 | eiph = ip_hdr(skb2); |
c4d3efaf YK |
612 | |
613 | /* Try to guess incoming interface */ | |
31e4543d | 614 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, |
78fbfd8a DM |
615 | eiph->saddr, 0, |
616 | 0, 0, | |
617 | IPPROTO_IPIP, RT_TOS(eiph->tos), 0); | |
b23dd4fe | 618 | if (IS_ERR(rt)) |
c4d3efaf YK |
619 | goto out; |
620 | ||
d8d1f30b | 621 | skb2->dev = rt->dst.dev; |
c4d3efaf YK |
622 | |
623 | /* route "incoming" packet */ | |
624 | if (rt->rt_flags & RTCF_LOCAL) { | |
625 | ip_rt_put(rt); | |
626 | rt = NULL; | |
31e4543d | 627 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, |
78fbfd8a DM |
628 | eiph->daddr, eiph->saddr, |
629 | 0, 0, | |
630 | IPPROTO_IPIP, | |
631 | RT_TOS(eiph->tos), 0); | |
b23dd4fe | 632 | if (IS_ERR(rt) || |
d8d1f30b | 633 | rt->dst.dev->type != ARPHRD_TUNNEL) { |
b23dd4fe DM |
634 | if (!IS_ERR(rt)) |
635 | ip_rt_put(rt); | |
c4d3efaf YK |
636 | goto out; |
637 | } | |
b23dd4fe | 638 | skb_dst_set(skb2, &rt->dst); |
c4d3efaf YK |
639 | } else { |
640 | ip_rt_put(rt); | |
641 | if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, | |
642 | skb2->dev) || | |
adf30907 | 643 | skb_dst(skb2)->dev->type != ARPHRD_TUNNEL) |
c4d3efaf YK |
644 | goto out; |
645 | } | |
646 | ||
647 | /* change mtu on this route */ | |
648 | if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { | |
adf30907 | 649 | if (rel_info > dst_mtu(skb_dst(skb2))) |
c4d3efaf YK |
650 | goto out; |
651 | ||
6700c270 | 652 | skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2, rel_info); |
c4d3efaf | 653 | } |
1ed5c48f | 654 | if (rel_type == ICMP_REDIRECT) |
6700c270 | 655 | skb_dst(skb2)->ops->redirect(skb_dst(skb2), NULL, skb2); |
c4d3efaf | 656 | |
704eae1f | 657 | icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); |
c4d3efaf YK |
658 | |
659 | out: | |
660 | kfree_skb(skb2); | |
661 | return 0; | |
662 | } | |
663 | ||
e490d1d8 YK |
664 | static int |
665 | ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 666 | u8 type, u8 code, int offset, __be32 info) |
e490d1d8 YK |
667 | { |
668 | int rel_msg = 0; | |
d5fdd6ba BH |
669 | u8 rel_type = type; |
670 | u8 rel_code = code; | |
704eae1f | 671 | __u32 rel_info = ntohl(info); |
e490d1d8 YK |
672 | int err; |
673 | ||
502b0935 YK |
674 | err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, |
675 | &rel_msg, &rel_info, offset); | |
e490d1d8 YK |
676 | if (err < 0) |
677 | return err; | |
678 | ||
679 | if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { | |
1da177e4 LT |
680 | struct rt6_info *rt; |
681 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
305d4b3c | 682 | |
1da177e4 | 683 | if (!skb2) |
e490d1d8 | 684 | return 0; |
1da177e4 | 685 | |
adf30907 | 686 | skb_dst_drop(skb2); |
1da177e4 | 687 | skb_pull(skb2, offset); |
c1d2bbe1 | 688 | skb_reset_network_header(skb2); |
1da177e4 LT |
689 | |
690 | /* Try to guess incoming interface */ | |
2f7f54b7 PE |
691 | rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, |
692 | NULL, 0, 0); | |
1da177e4 | 693 | |
d1918542 DM |
694 | if (rt && rt->dst.dev) |
695 | skb2->dev = rt->dst.dev; | |
1da177e4 | 696 | |
3ffe533c | 697 | icmpv6_send(skb2, rel_type, rel_code, rel_info); |
1da177e4 | 698 | |
94e187c0 | 699 | ip6_rt_put(rt); |
1da177e4 LT |
700 | |
701 | kfree_skb(skb2); | |
702 | } | |
e490d1d8 YK |
703 | |
704 | return 0; | |
1da177e4 LT |
705 | } |
706 | ||
f4e0b4c5 ND |
707 | static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
708 | const struct ipv6hdr *ipv6h, | |
709 | struct sk_buff *skb) | |
c4d3efaf YK |
710 | { |
711 | __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; | |
712 | ||
713 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) | |
eddc9ec5 | 714 | ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); |
c4d3efaf | 715 | |
f4e0b4c5 | 716 | return IP6_ECN_decapsulate(ipv6h, skb); |
c4d3efaf YK |
717 | } |
718 | ||
f4e0b4c5 ND |
719 | static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
720 | const struct ipv6hdr *ipv6h, | |
721 | struct sk_buff *skb) | |
1da177e4 | 722 | { |
8359925b | 723 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) |
29bb43b4 | 724 | ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); |
1da177e4 | 725 | |
f4e0b4c5 | 726 | return IP6_ECN_decapsulate(ipv6h, skb); |
1da177e4 | 727 | } |
8359925b | 728 | |
c12b395a | 729 | __u32 ip6_tnl_get_cap(struct ip6_tnl *t, |
d0087b29 VN |
730 | const struct in6_addr *laddr, |
731 | const struct in6_addr *raddr) | |
732 | { | |
c12b395a | 733 | struct __ip6_tnl_parm *p = &t->parms; |
d0087b29 VN |
734 | int ltype = ipv6_addr_type(laddr); |
735 | int rtype = ipv6_addr_type(raddr); | |
736 | __u32 flags = 0; | |
737 | ||
738 | if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) { | |
739 | flags = IP6_TNL_F_CAP_PER_PACKET; | |
740 | } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
741 | rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
742 | !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && | |
743 | (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { | |
744 | if (ltype&IPV6_ADDR_UNICAST) | |
745 | flags |= IP6_TNL_F_CAP_XMIT; | |
746 | if (rtype&IPV6_ADDR_UNICAST) | |
747 | flags |= IP6_TNL_F_CAP_RCV; | |
748 | } | |
749 | return flags; | |
750 | } | |
c12b395a | 751 | EXPORT_SYMBOL(ip6_tnl_get_cap); |
d0087b29 | 752 | |
f1a28eab | 753 | /* called with rcu_read_lock() */ |
c12b395a | 754 | int ip6_tnl_rcv_ctl(struct ip6_tnl *t, |
d0087b29 VN |
755 | const struct in6_addr *laddr, |
756 | const struct in6_addr *raddr) | |
09c6bbf0 | 757 | { |
c12b395a | 758 | struct __ip6_tnl_parm *p = &t->parms; |
09c6bbf0 | 759 | int ret = 0; |
0bd87628 | 760 | struct net *net = t->net; |
09c6bbf0 | 761 | |
d0087b29 VN |
762 | if ((p->flags & IP6_TNL_F_CAP_RCV) || |
763 | ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && | |
764 | (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) { | |
1ab1457c | 765 | struct net_device *ldev = NULL; |
09c6bbf0 VN |
766 | |
767 | if (p->link) | |
f1a28eab | 768 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 769 | |
d0087b29 VN |
770 | if ((ipv6_addr_is_multicast(laddr) || |
771 | likely(ipv6_chk_addr(net, laddr, ldev, 0))) && | |
772 | likely(!ipv6_chk_addr(net, raddr, NULL, 0))) | |
09c6bbf0 | 773 | ret = 1; |
09c6bbf0 VN |
774 | } |
775 | return ret; | |
776 | } | |
c12b395a | 777 | EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl); |
1da177e4 LT |
778 | |
779 | /** | |
3144581c | 780 | * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally |
1da177e4 | 781 | * @skb: received socket buffer |
8359925b YK |
782 | * @protocol: ethernet protocol ID |
783 | * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN | |
1da177e4 LT |
784 | * |
785 | * Return: 0 | |
786 | **/ | |
787 | ||
8359925b | 788 | static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol, |
502b0935 | 789 | __u8 ipproto, |
f4e0b4c5 ND |
790 | int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, |
791 | const struct ipv6hdr *ipv6h, | |
792 | struct sk_buff *skb)) | |
1da177e4 | 793 | { |
1da177e4 | 794 | struct ip6_tnl *t; |
b71d1d42 | 795 | const struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
acf722f7 | 796 | u8 tproto; |
f4e0b4c5 | 797 | int err; |
1da177e4 | 798 | |
2922bc8a | 799 | rcu_read_lock(); |
1da177e4 | 800 | |
8704ca7e | 801 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, |
2dd02c89 | 802 | &ipv6h->daddr)) != NULL) { |
8f84985f | 803 | struct pcpu_sw_netstats *tstats; |
8560f226 | 804 | |
acf722f7 AA |
805 | tproto = ACCESS_ONCE(t->parms.proto); |
806 | if (tproto != ipproto && tproto != 0) { | |
2922bc8a | 807 | rcu_read_unlock(); |
502b0935 YK |
808 | goto discard; |
809 | } | |
810 | ||
1da177e4 | 811 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
2922bc8a | 812 | rcu_read_unlock(); |
50fba2aa | 813 | goto discard; |
1da177e4 LT |
814 | } |
815 | ||
d0087b29 | 816 | if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) { |
3dca02af | 817 | t->dev->stats.rx_dropped++; |
2922bc8a | 818 | rcu_read_unlock(); |
1da177e4 LT |
819 | goto discard; |
820 | } | |
b0e380b1 | 821 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 822 | skb_reset_network_header(skb); |
8359925b | 823 | skb->protocol = htons(protocol); |
1da177e4 | 824 | memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); |
8359925b | 825 | |
ea23192e | 826 | __skb_tunnel_rx(skb, t->dev, t->net); |
f4e0b4c5 ND |
827 | |
828 | err = dscp_ecn_decapsulate(t, ipv6h, skb); | |
829 | if (unlikely(err)) { | |
830 | if (log_ecn_error) | |
831 | net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n", | |
832 | &ipv6h->saddr, | |
833 | ipv6_get_dsfield(ipv6h)); | |
834 | if (err > 1) { | |
835 | ++t->dev->stats.rx_frame_errors; | |
836 | ++t->dev->stats.rx_errors; | |
837 | rcu_read_unlock(); | |
838 | goto discard; | |
839 | } | |
840 | } | |
841 | ||
8560f226 | 842 | tstats = this_cpu_ptr(t->dev->tstats); |
abb6013c | 843 | u64_stats_update_begin(&tstats->syncp); |
8560f226 ED |
844 | tstats->rx_packets++; |
845 | tstats->rx_bytes += skb->len; | |
abb6013c | 846 | u64_stats_update_end(&tstats->syncp); |
8560f226 | 847 | |
caf586e5 | 848 | netif_rx(skb); |
8990f468 | 849 | |
2922bc8a | 850 | rcu_read_unlock(); |
1da177e4 LT |
851 | return 0; |
852 | } | |
2922bc8a | 853 | rcu_read_unlock(); |
1da177e4 | 854 | return 1; |
50fba2aa HX |
855 | |
856 | discard: | |
857 | kfree_skb(skb); | |
858 | return 0; | |
1da177e4 LT |
859 | } |
860 | ||
c4d3efaf YK |
861 | static int ip4ip6_rcv(struct sk_buff *skb) |
862 | { | |
502b0935 YK |
863 | return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP, |
864 | ip4ip6_dscp_ecn_decapsulate); | |
c4d3efaf YK |
865 | } |
866 | ||
8359925b YK |
867 | static int ip6ip6_rcv(struct sk_buff *skb) |
868 | { | |
502b0935 YK |
869 | return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6, |
870 | ip6ip6_dscp_ecn_decapsulate); | |
8359925b YK |
871 | } |
872 | ||
6fb32dde VN |
873 | struct ipv6_tel_txoption { |
874 | struct ipv6_txoptions ops; | |
875 | __u8 dst_opt[8]; | |
876 | }; | |
1da177e4 | 877 | |
6fb32dde VN |
878 | static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) |
879 | { | |
880 | memset(opt, 0, sizeof(struct ipv6_tel_txoption)); | |
1da177e4 | 881 | |
6fb32dde VN |
882 | opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; |
883 | opt->dst_opt[3] = 1; | |
884 | opt->dst_opt[4] = encap_limit; | |
885 | opt->dst_opt[5] = IPV6_TLV_PADN; | |
886 | opt->dst_opt[6] = 1; | |
1da177e4 | 887 | |
6fb32dde VN |
888 | opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; |
889 | opt->ops.opt_nflen = 8; | |
1da177e4 LT |
890 | } |
891 | ||
892 | /** | |
3144581c | 893 | * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own |
1da177e4 | 894 | * @t: the outgoing tunnel device |
1ab1457c | 895 | * @hdr: IPv6 header from the incoming packet |
1da177e4 LT |
896 | * |
897 | * Description: | |
1ab1457c | 898 | * Avoid trivial tunneling loop by checking that tunnel exit-point |
1da177e4 LT |
899 | * doesn't match source of incoming packet. |
900 | * | |
1ab1457c | 901 | * Return: |
1da177e4 LT |
902 | * 1 if conflict, |
903 | * 0 else | |
904 | **/ | |
905 | ||
92113bfd | 906 | static inline bool |
b71d1d42 | 907 | ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) |
1da177e4 LT |
908 | { |
909 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
910 | } | |
911 | ||
d5005140 SK |
912 | int ip6_tnl_xmit_ctl(struct ip6_tnl *t, |
913 | const struct in6_addr *laddr, | |
914 | const struct in6_addr *raddr) | |
09c6bbf0 | 915 | { |
c12b395a | 916 | struct __ip6_tnl_parm *p = &t->parms; |
09c6bbf0 | 917 | int ret = 0; |
0bd87628 | 918 | struct net *net = t->net; |
09c6bbf0 | 919 | |
d5005140 SK |
920 | if ((p->flags & IP6_TNL_F_CAP_XMIT) || |
921 | ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && | |
922 | (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) { | |
09c6bbf0 VN |
923 | struct net_device *ldev = NULL; |
924 | ||
f1a28eab | 925 | rcu_read_lock(); |
09c6bbf0 | 926 | if (p->link) |
f1a28eab | 927 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 928 | |
d5005140 | 929 | if (unlikely(!ipv6_chk_addr(net, laddr, ldev, 0))) |
f3213831 JP |
930 | pr_warn("%s xmit: Local address not yet configured!\n", |
931 | p->name); | |
d5005140 SK |
932 | else if (!ipv6_addr_is_multicast(raddr) && |
933 | unlikely(ipv6_chk_addr(net, raddr, NULL, 0))) | |
f3213831 JP |
934 | pr_warn("%s xmit: Routing loop! Remote address found on this node!\n", |
935 | p->name); | |
09c6bbf0 VN |
936 | else |
937 | ret = 1; | |
f1a28eab | 938 | rcu_read_unlock(); |
09c6bbf0 VN |
939 | } |
940 | return ret; | |
941 | } | |
c12b395a | 942 | EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl); |
943 | ||
1da177e4 | 944 | /** |
61ec2aec | 945 | * ip6_tnl_xmit2 - encapsulate packet and send |
1da177e4 | 946 | * @skb: the outgoing socket buffer |
1ab1457c | 947 | * @dev: the outgoing tunnel device |
61ec2aec YK |
948 | * @dsfield: dscp code for outer header |
949 | * @fl: flow of tunneled packet | |
950 | * @encap_limit: encapsulation limit | |
951 | * @pmtu: Path MTU is stored if packet is too big | |
1da177e4 LT |
952 | * |
953 | * Description: | |
954 | * Build new header and do some sanity checks on the packet before sending | |
955 | * it. | |
956 | * | |
1ab1457c | 957 | * Return: |
c4d3efaf | 958 | * 0 on success |
61ec2aec YK |
959 | * -1 fail |
960 | * %-EMSGSIZE message too big. return mtu in this case. | |
1da177e4 LT |
961 | **/ |
962 | ||
61ec2aec YK |
963 | static int ip6_tnl_xmit2(struct sk_buff *skb, |
964 | struct net_device *dev, | |
965 | __u8 dsfield, | |
4c9483b2 | 966 | struct flowi6 *fl6, |
61ec2aec YK |
967 | int encap_limit, |
968 | __u32 *pmtu) | |
1da177e4 | 969 | { |
2941a486 | 970 | struct ip6_tnl *t = netdev_priv(dev); |
0bd87628 | 971 | struct net *net = t->net; |
3dca02af | 972 | struct net_device_stats *stats = &t->dev->stats; |
0660e03f | 973 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
6fb32dde | 974 | struct ipv6_tel_txoption opt; |
d24f22f3 | 975 | struct dst_entry *dst = NULL, *ndst = NULL; |
1da177e4 LT |
976 | struct net_device *tdev; |
977 | int mtu; | |
c2636b4d | 978 | unsigned int max_headroom = sizeof(struct ipv6hdr); |
1da177e4 | 979 | u8 proto; |
61ec2aec | 980 | int err = -1; |
1da177e4 | 981 | |
d24f22f3 ED |
982 | if (!fl6->flowi6_mark) |
983 | dst = ip6_tnl_dst_check(t); | |
d5005140 SK |
984 | |
985 | if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr)) | |
986 | goto tx_err_link_failure; | |
987 | ||
89b02126 ED |
988 | if (!dst) { |
989 | ndst = ip6_route_output(net, NULL, fl6); | |
1da177e4 | 990 | |
89b02126 | 991 | if (ndst->error) |
a57ebc90 | 992 | goto tx_err_link_failure; |
89b02126 ED |
993 | ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0); |
994 | if (IS_ERR(ndst)) { | |
995 | err = PTR_ERR(ndst); | |
996 | ndst = NULL; | |
452edd59 DM |
997 | goto tx_err_link_failure; |
998 | } | |
89b02126 | 999 | dst = ndst; |
a57ebc90 | 1000 | } |
1da177e4 LT |
1001 | |
1002 | tdev = dst->dev; | |
1003 | ||
1004 | if (tdev == dev) { | |
1005 | stats->collisions++; | |
e87cc472 JP |
1006 | net_warn_ratelimited("%s: Local routing loop detected!\n", |
1007 | t->parms.name); | |
1da177e4 LT |
1008 | goto tx_err_dst_release; |
1009 | } | |
67ba4152 | 1010 | mtu = dst_mtu(dst) - sizeof(*ipv6h); |
6fb32dde | 1011 | if (encap_limit >= 0) { |
1da177e4 LT |
1012 | max_headroom += 8; |
1013 | mtu -= 8; | |
1014 | } | |
1015 | if (mtu < IPV6_MIN_MTU) | |
1016 | mtu = IPV6_MIN_MTU; | |
adf30907 | 1017 | if (skb_dst(skb)) |
6700c270 | 1018 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); |
1da177e4 | 1019 | if (skb->len > mtu) { |
61ec2aec YK |
1020 | *pmtu = mtu; |
1021 | err = -EMSGSIZE; | |
1da177e4 LT |
1022 | goto tx_err_dst_release; |
1023 | } | |
1024 | ||
963a88b3 | 1025 | skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev))); |
0bd87628 | 1026 | |
1da177e4 LT |
1027 | /* |
1028 | * Okay, now see if we can stuff it in the buffer as-is. | |
1029 | */ | |
1030 | max_headroom += LL_RESERVED_SPACE(tdev); | |
1ab1457c | 1031 | |
cfbba49d PM |
1032 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
1033 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 | 1034 | struct sk_buff *new_skb; |
1ab1457c | 1035 | |
1da177e4 LT |
1036 | if (!(new_skb = skb_realloc_headroom(skb, max_headroom))) |
1037 | goto tx_err_dst_release; | |
1038 | ||
1039 | if (skb->sk) | |
1040 | skb_set_owner_w(new_skb, skb->sk); | |
9ff26449 | 1041 | consume_skb(skb); |
1da177e4 LT |
1042 | skb = new_skb; |
1043 | } | |
d24f22f3 ED |
1044 | if (fl6->flowi6_mark) { |
1045 | skb_dst_set(skb, dst); | |
1046 | ndst = NULL; | |
1047 | } else { | |
1048 | skb_dst_set_noref(skb, dst); | |
1049 | } | |
b0e380b1 | 1050 | skb->transport_header = skb->network_header; |
1da177e4 | 1051 | |
4c9483b2 | 1052 | proto = fl6->flowi6_proto; |
6fb32dde VN |
1053 | if (encap_limit >= 0) { |
1054 | init_tel_txopt(&opt, encap_limit); | |
1055 | ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); | |
1056 | } | |
3d483058 HFS |
1057 | |
1058 | if (likely(!skb->encapsulation)) { | |
1059 | skb_reset_inner_headers(skb); | |
1060 | skb->encapsulation = 1; | |
1061 | } | |
1062 | ||
e2d1bca7 ACM |
1063 | skb_push(skb, sizeof(struct ipv6hdr)); |
1064 | skb_reset_network_header(skb); | |
0660e03f | 1065 | ipv6h = ipv6_hdr(skb); |
cb1ce2ef TH |
1066 | ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), |
1067 | ip6_make_flowlabel(net, skb, fl6->flowlabel, false)); | |
1da177e4 LT |
1068 | ipv6h->hop_limit = t->parms.hop_limit; |
1069 | ipv6h->nexthdr = proto; | |
4e3fd7a0 AD |
1070 | ipv6h->saddr = fl6->saddr; |
1071 | ipv6h->daddr = fl6->daddr; | |
e8f72ea4 | 1072 | ip6tunnel_xmit(skb, dev); |
89b02126 ED |
1073 | if (ndst) |
1074 | ip6_tnl_dst_store(t, ndst); | |
1da177e4 LT |
1075 | return 0; |
1076 | tx_err_link_failure: | |
1077 | stats->tx_carrier_errors++; | |
1078 | dst_link_failure(skb); | |
1079 | tx_err_dst_release: | |
89b02126 | 1080 | dst_release(ndst); |
61ec2aec YK |
1081 | return err; |
1082 | } | |
1083 | ||
c4d3efaf YK |
1084 | static inline int |
1085 | ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1086 | { | |
1087 | struct ip6_tnl *t = netdev_priv(dev); | |
b71d1d42 | 1088 | const struct iphdr *iph = ip_hdr(skb); |
c4d3efaf | 1089 | int encap_limit = -1; |
4c9483b2 | 1090 | struct flowi6 fl6; |
c4d3efaf YK |
1091 | __u8 dsfield; |
1092 | __u32 mtu; | |
acf722f7 | 1093 | u8 tproto; |
c4d3efaf YK |
1094 | int err; |
1095 | ||
acf722f7 | 1096 | tproto = ACCESS_ONCE(t->parms.proto); |
d5005140 | 1097 | if (tproto != IPPROTO_IPIP && tproto != 0) |
c4d3efaf YK |
1098 | return -1; |
1099 | ||
1100 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1101 | encap_limit = t->parms.encap_limit; | |
1102 | ||
67ba4152 | 1103 | memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); |
4c9483b2 | 1104 | fl6.flowi6_proto = IPPROTO_IPIP; |
c4d3efaf YK |
1105 | |
1106 | dsfield = ipv4_get_dsfield(iph); | |
1107 | ||
d24f22f3 | 1108 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
4c9483b2 | 1109 | fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) |
b77f2fa6 | 1110 | & IPV6_TCLASS_MASK; |
d24f22f3 ED |
1111 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
1112 | fl6.flowi6_mark = skb->mark; | |
c4d3efaf | 1113 | |
4c9483b2 | 1114 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); |
c4d3efaf YK |
1115 | if (err != 0) { |
1116 | /* XXX: send ICMP error even if DF is not set. */ | |
1117 | if (err == -EMSGSIZE) | |
1118 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
1119 | htonl(mtu)); | |
1120 | return -1; | |
1121 | } | |
1122 | ||
1123 | return 0; | |
1124 | } | |
1125 | ||
61ec2aec YK |
1126 | static inline int |
1127 | ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1128 | { | |
1129 | struct ip6_tnl *t = netdev_priv(dev); | |
0660e03f | 1130 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
61ec2aec YK |
1131 | int encap_limit = -1; |
1132 | __u16 offset; | |
4c9483b2 | 1133 | struct flowi6 fl6; |
61ec2aec YK |
1134 | __u8 dsfield; |
1135 | __u32 mtu; | |
acf722f7 | 1136 | u8 tproto; |
61ec2aec YK |
1137 | int err; |
1138 | ||
acf722f7 AA |
1139 | tproto = ACCESS_ONCE(t->parms.proto); |
1140 | if ((tproto != IPPROTO_IPV6 && tproto != 0) || | |
d5005140 | 1141 | ip6_tnl_addr_conflict(t, ipv6h)) |
61ec2aec YK |
1142 | return -1; |
1143 | ||
c12b395a | 1144 | offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); |
d56f90a7 | 1145 | if (offset > 0) { |
61ec2aec | 1146 | struct ipv6_tlv_tnl_enc_lim *tel; |
d56f90a7 | 1147 | tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; |
61ec2aec YK |
1148 | if (tel->encap_limit == 0) { |
1149 | icmpv6_send(skb, ICMPV6_PARAMPROB, | |
3ffe533c | 1150 | ICMPV6_HDR_FIELD, offset + 2); |
61ec2aec YK |
1151 | return -1; |
1152 | } | |
1153 | encap_limit = tel->encap_limit - 1; | |
1154 | } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1155 | encap_limit = t->parms.encap_limit; | |
1156 | ||
67ba4152 | 1157 | memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); |
4c9483b2 | 1158 | fl6.flowi6_proto = IPPROTO_IPV6; |
61ec2aec YK |
1159 | |
1160 | dsfield = ipv6_get_dsfield(ipv6h); | |
d24f22f3 | 1161 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
4c9483b2 | 1162 | fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); |
d24f22f3 | 1163 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) |
3308de2b | 1164 | fl6.flowlabel |= ip6_flowlabel(ipv6h); |
d24f22f3 ED |
1165 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
1166 | fl6.flowi6_mark = skb->mark; | |
61ec2aec | 1167 | |
4c9483b2 | 1168 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); |
61ec2aec YK |
1169 | if (err != 0) { |
1170 | if (err == -EMSGSIZE) | |
3ffe533c | 1171 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
61ec2aec YK |
1172 | return -1; |
1173 | } | |
1174 | ||
1175 | return 0; | |
1176 | } | |
1177 | ||
6fef4c0c | 1178 | static netdev_tx_t |
61ec2aec YK |
1179 | ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) |
1180 | { | |
1181 | struct ip6_tnl *t = netdev_priv(dev); | |
3dca02af | 1182 | struct net_device_stats *stats = &t->dev->stats; |
61ec2aec YK |
1183 | int ret; |
1184 | ||
61ec2aec | 1185 | switch (skb->protocol) { |
60678040 | 1186 | case htons(ETH_P_IP): |
c4d3efaf YK |
1187 | ret = ip4ip6_tnl_xmit(skb, dev); |
1188 | break; | |
60678040 | 1189 | case htons(ETH_P_IPV6): |
61ec2aec YK |
1190 | ret = ip6ip6_tnl_xmit(skb, dev); |
1191 | break; | |
1192 | default: | |
1193 | goto tx_err; | |
1194 | } | |
1195 | ||
1196 | if (ret < 0) | |
1197 | goto tx_err; | |
1198 | ||
6ed10654 | 1199 | return NETDEV_TX_OK; |
61ec2aec | 1200 | |
1da177e4 LT |
1201 | tx_err: |
1202 | stats->tx_errors++; | |
1203 | stats->tx_dropped++; | |
1204 | kfree_skb(skb); | |
6ed10654 | 1205 | return NETDEV_TX_OK; |
1da177e4 LT |
1206 | } |
1207 | ||
3144581c | 1208 | static void ip6_tnl_link_config(struct ip6_tnl *t) |
1da177e4 LT |
1209 | { |
1210 | struct net_device *dev = t->dev; | |
c12b395a | 1211 | struct __ip6_tnl_parm *p = &t->parms; |
4c9483b2 | 1212 | struct flowi6 *fl6 = &t->fl.u.ip6; |
1da177e4 | 1213 | |
3a6d54c5 JP |
1214 | memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); |
1215 | memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
1da177e4 LT |
1216 | |
1217 | /* Set up flowi template */ | |
4e3fd7a0 AD |
1218 | fl6->saddr = p->laddr; |
1219 | fl6->daddr = p->raddr; | |
4c9483b2 DM |
1220 | fl6->flowi6_oif = p->link; |
1221 | fl6->flowlabel = 0; | |
1da177e4 LT |
1222 | |
1223 | if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) | |
4c9483b2 | 1224 | fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; |
1da177e4 | 1225 | if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) |
4c9483b2 | 1226 | fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; |
1da177e4 | 1227 | |
d0087b29 VN |
1228 | p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); |
1229 | p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); | |
1da177e4 LT |
1230 | |
1231 | if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) | |
1232 | dev->flags |= IFF_POINTOPOINT; | |
1233 | else | |
1234 | dev->flags &= ~IFF_POINTOPOINT; | |
1235 | ||
1236 | dev->iflink = p->link; | |
1237 | ||
1238 | if (p->flags & IP6_TNL_F_CAP_XMIT) { | |
305d4b3c VN |
1239 | int strict = (ipv6_addr_type(&p->raddr) & |
1240 | (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); | |
1241 | ||
0bd87628 | 1242 | struct rt6_info *rt = rt6_lookup(t->net, |
2f7f54b7 | 1243 | &p->raddr, &p->laddr, |
305d4b3c | 1244 | p->link, strict); |
1da177e4 LT |
1245 | |
1246 | if (rt == NULL) | |
1247 | return; | |
1248 | ||
d1918542 DM |
1249 | if (rt->dst.dev) { |
1250 | dev->hard_header_len = rt->dst.dev->hard_header_len + | |
67ba4152 | 1251 | sizeof(struct ipv6hdr); |
1da177e4 | 1252 | |
67ba4152 | 1253 | dev->mtu = rt->dst.dev->mtu - sizeof(struct ipv6hdr); |
381601e5 | 1254 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
67ba4152 | 1255 | dev->mtu -= 8; |
1da177e4 LT |
1256 | |
1257 | if (dev->mtu < IPV6_MIN_MTU) | |
1258 | dev->mtu = IPV6_MIN_MTU; | |
1259 | } | |
94e187c0 | 1260 | ip6_rt_put(rt); |
1da177e4 LT |
1261 | } |
1262 | } | |
1263 | ||
1264 | /** | |
3144581c | 1265 | * ip6_tnl_change - update the tunnel parameters |
1da177e4 LT |
1266 | * @t: tunnel to be changed |
1267 | * @p: tunnel configuration parameters | |
1da177e4 LT |
1268 | * |
1269 | * Description: | |
3144581c | 1270 | * ip6_tnl_change() updates the tunnel parameters |
1da177e4 LT |
1271 | **/ |
1272 | ||
1273 | static int | |
c12b395a | 1274 | ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) |
1da177e4 | 1275 | { |
4e3fd7a0 AD |
1276 | t->parms.laddr = p->laddr; |
1277 | t->parms.raddr = p->raddr; | |
1da177e4 LT |
1278 | t->parms.flags = p->flags; |
1279 | t->parms.hop_limit = p->hop_limit; | |
1280 | t->parms.encap_limit = p->encap_limit; | |
1281 | t->parms.flowinfo = p->flowinfo; | |
8181b8c1 | 1282 | t->parms.link = p->link; |
502b0935 | 1283 | t->parms.proto = p->proto; |
0c088890 | 1284 | ip6_tnl_dst_reset(t); |
3144581c | 1285 | ip6_tnl_link_config(t); |
1da177e4 LT |
1286 | return 0; |
1287 | } | |
1288 | ||
0b112457 ND |
1289 | static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) |
1290 | { | |
0bd87628 | 1291 | struct net *net = t->net; |
0b112457 ND |
1292 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1293 | int err; | |
1294 | ||
1295 | ip6_tnl_unlink(ip6n, t); | |
1296 | synchronize_net(); | |
1297 | err = ip6_tnl_change(t, p); | |
1298 | ip6_tnl_link(ip6n, t); | |
1299 | netdev_state_change(t->dev); | |
1300 | return err; | |
1301 | } | |
1302 | ||
acf722f7 AA |
1303 | static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) |
1304 | { | |
1305 | /* for default tnl0 device allow to change only the proto */ | |
1306 | t->parms.proto = p->proto; | |
1307 | netdev_state_change(t->dev); | |
1308 | return 0; | |
1309 | } | |
1310 | ||
c12b395a | 1311 | static void |
1312 | ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u) | |
1313 | { | |
1314 | p->laddr = u->laddr; | |
1315 | p->raddr = u->raddr; | |
1316 | p->flags = u->flags; | |
1317 | p->hop_limit = u->hop_limit; | |
1318 | p->encap_limit = u->encap_limit; | |
1319 | p->flowinfo = u->flowinfo; | |
1320 | p->link = u->link; | |
1321 | p->proto = u->proto; | |
1322 | memcpy(p->name, u->name, sizeof(u->name)); | |
1323 | } | |
1324 | ||
1325 | static void | |
1326 | ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p) | |
1327 | { | |
1328 | u->laddr = p->laddr; | |
1329 | u->raddr = p->raddr; | |
1330 | u->flags = p->flags; | |
1331 | u->hop_limit = p->hop_limit; | |
1332 | u->encap_limit = p->encap_limit; | |
1333 | u->flowinfo = p->flowinfo; | |
1334 | u->link = p->link; | |
1335 | u->proto = p->proto; | |
1336 | memcpy(u->name, p->name, sizeof(u->name)); | |
1337 | } | |
1338 | ||
1da177e4 | 1339 | /** |
3144581c | 1340 | * ip6_tnl_ioctl - configure ipv6 tunnels from userspace |
1da177e4 LT |
1341 | * @dev: virtual device associated with tunnel |
1342 | * @ifr: parameters passed from userspace | |
1343 | * @cmd: command to be performed | |
1344 | * | |
1345 | * Description: | |
3144581c | 1346 | * ip6_tnl_ioctl() is used for managing IPv6 tunnels |
1ab1457c | 1347 | * from userspace. |
1da177e4 LT |
1348 | * |
1349 | * The possible commands are the following: | |
1350 | * %SIOCGETTUNNEL: get tunnel parameters for device | |
1351 | * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters | |
1352 | * %SIOCCHGTUNNEL: change tunnel parameters to those given | |
1353 | * %SIOCDELTUNNEL: delete tunnel | |
1354 | * | |
1ab1457c | 1355 | * The fallback device "ip6tnl0", created during module |
1da177e4 LT |
1356 | * initialization, can be used for creating other tunnel devices. |
1357 | * | |
1358 | * Return: | |
1359 | * 0 on success, | |
1360 | * %-EFAULT if unable to copy data to or from userspace, | |
1361 | * %-EPERM if current process hasn't %CAP_NET_ADMIN set | |
1362 | * %-EINVAL if passed tunnel parameters are invalid, | |
1363 | * %-EEXIST if changing a tunnel's parameters would cause a conflict | |
1364 | * %-ENODEV if attempting to change or delete a nonexisting device | |
1365 | **/ | |
1366 | ||
1367 | static int | |
3144581c | 1368 | ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
1da177e4 LT |
1369 | { |
1370 | int err = 0; | |
1da177e4 | 1371 | struct ip6_tnl_parm p; |
c12b395a | 1372 | struct __ip6_tnl_parm p1; |
74462f0d ND |
1373 | struct ip6_tnl *t = netdev_priv(dev); |
1374 | struct net *net = t->net; | |
2dd02c89 | 1375 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 LT |
1376 | |
1377 | switch (cmd) { | |
1378 | case SIOCGETTUNNEL: | |
15820e12 | 1379 | if (dev == ip6n->fb_tnl_dev) { |
67ba4152 | 1380 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
1da177e4 LT |
1381 | err = -EFAULT; |
1382 | break; | |
1383 | } | |
c12b395a | 1384 | ip6_tnl_parm_from_user(&p1, &p); |
1385 | t = ip6_tnl_locate(net, &p1, 0); | |
74462f0d ND |
1386 | if (t == NULL) |
1387 | t = netdev_priv(dev); | |
5ef5d6c5 DC |
1388 | } else { |
1389 | memset(&p, 0, sizeof(p)); | |
567131a7 | 1390 | } |
c12b395a | 1391 | ip6_tnl_parm_to_user(&p, &t->parms); |
67ba4152 | 1392 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) { |
1da177e4 LT |
1393 | err = -EFAULT; |
1394 | } | |
1395 | break; | |
1396 | case SIOCADDTUNNEL: | |
1397 | case SIOCCHGTUNNEL: | |
1398 | err = -EPERM; | |
af31f412 | 1399 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 1400 | break; |
567131a7 | 1401 | err = -EFAULT; |
67ba4152 | 1402 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
1da177e4 | 1403 | break; |
567131a7 | 1404 | err = -EINVAL; |
502b0935 YK |
1405 | if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && |
1406 | p.proto != 0) | |
1da177e4 | 1407 | break; |
c12b395a | 1408 | ip6_tnl_parm_from_user(&p1, &p); |
1409 | t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL); | |
acf722f7 | 1410 | if (cmd == SIOCCHGTUNNEL) { |
567131a7 VN |
1411 | if (t != NULL) { |
1412 | if (t->dev != dev) { | |
1413 | err = -EEXIST; | |
1414 | break; | |
1415 | } | |
1416 | } else | |
1417 | t = netdev_priv(dev); | |
acf722f7 AA |
1418 | if (dev == ip6n->fb_tnl_dev) |
1419 | err = ip6_tnl0_update(t, &p1); | |
1420 | else | |
1421 | err = ip6_tnl_update(t, &p1); | |
1da177e4 | 1422 | } |
567131a7 | 1423 | if (t) { |
1da177e4 | 1424 | err = 0; |
c12b395a | 1425 | ip6_tnl_parm_to_user(&p, &t->parms); |
1426 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
567131a7 VN |
1427 | err = -EFAULT; |
1428 | ||
1429 | } else | |
1430 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1da177e4 LT |
1431 | break; |
1432 | case SIOCDELTUNNEL: | |
1433 | err = -EPERM; | |
af31f412 | 1434 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1435 | break; |
1436 | ||
15820e12 | 1437 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 | 1438 | err = -EFAULT; |
67ba4152 | 1439 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
1da177e4 | 1440 | break; |
567131a7 | 1441 | err = -ENOENT; |
c12b395a | 1442 | ip6_tnl_parm_from_user(&p1, &p); |
1443 | t = ip6_tnl_locate(net, &p1, 0); | |
1444 | if (t == NULL) | |
1da177e4 | 1445 | break; |
567131a7 | 1446 | err = -EPERM; |
15820e12 | 1447 | if (t->dev == ip6n->fb_tnl_dev) |
1da177e4 | 1448 | break; |
567131a7 | 1449 | dev = t->dev; |
1da177e4 | 1450 | } |
22f8cde5 SH |
1451 | err = 0; |
1452 | unregister_netdevice(dev); | |
1da177e4 LT |
1453 | break; |
1454 | default: | |
1455 | err = -EINVAL; | |
1456 | } | |
1457 | return err; | |
1458 | } | |
1459 | ||
1da177e4 | 1460 | /** |
3144581c | 1461 | * ip6_tnl_change_mtu - change mtu manually for tunnel device |
1da177e4 LT |
1462 | * @dev: virtual device associated with tunnel |
1463 | * @new_mtu: the new mtu | |
1464 | * | |
1465 | * Return: | |
1466 | * 0 on success, | |
1467 | * %-EINVAL if mtu too small | |
1468 | **/ | |
1469 | ||
1470 | static int | |
3144581c | 1471 | ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) |
1da177e4 | 1472 | { |
582442d6 OG |
1473 | struct ip6_tnl *tnl = netdev_priv(dev); |
1474 | ||
1475 | if (tnl->parms.proto == IPPROTO_IPIP) { | |
1476 | if (new_mtu < 68) | |
1477 | return -EINVAL; | |
1478 | } else { | |
1479 | if (new_mtu < IPV6_MIN_MTU) | |
1480 | return -EINVAL; | |
1da177e4 | 1481 | } |
582442d6 OG |
1482 | if (new_mtu > 0xFFF8 - dev->hard_header_len) |
1483 | return -EINVAL; | |
1da177e4 LT |
1484 | dev->mtu = new_mtu; |
1485 | return 0; | |
1486 | } | |
1487 | ||
1326c3d5 SH |
1488 | |
1489 | static const struct net_device_ops ip6_tnl_netdev_ops = { | |
8560f226 | 1490 | .ndo_uninit = ip6_tnl_dev_uninit, |
1326c3d5 | 1491 | .ndo_start_xmit = ip6_tnl_xmit, |
8560f226 | 1492 | .ndo_do_ioctl = ip6_tnl_ioctl, |
1326c3d5 | 1493 | .ndo_change_mtu = ip6_tnl_change_mtu, |
8560f226 | 1494 | .ndo_get_stats = ip6_get_stats, |
1326c3d5 SH |
1495 | }; |
1496 | ||
8560f226 | 1497 | |
1da177e4 | 1498 | /** |
3144581c | 1499 | * ip6_tnl_dev_setup - setup virtual tunnel device |
1da177e4 LT |
1500 | * @dev: virtual device associated with tunnel |
1501 | * | |
1502 | * Description: | |
1503 | * Initialize function pointers and device parameters | |
1504 | **/ | |
1505 | ||
3144581c | 1506 | static void ip6_tnl_dev_setup(struct net_device *dev) |
1da177e4 | 1507 | { |
381601e5 AF |
1508 | struct ip6_tnl *t; |
1509 | ||
1326c3d5 | 1510 | dev->netdev_ops = &ip6_tnl_netdev_ops; |
8560f226 | 1511 | dev->destructor = ip6_dev_free; |
1da177e4 LT |
1512 | |
1513 | dev->type = ARPHRD_TUNNEL6; | |
67ba4152 IM |
1514 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr); |
1515 | dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr); | |
381601e5 AF |
1516 | t = netdev_priv(dev); |
1517 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
67ba4152 | 1518 | dev->mtu -= 8; |
1da177e4 LT |
1519 | dev->flags |= IFF_NOARP; |
1520 | dev->addr_len = sizeof(struct in6_addr); | |
02875878 | 1521 | netif_keep_dst(dev); |
e837735e ND |
1522 | /* This perm addr will be used as interface identifier by IPv6 */ |
1523 | dev->addr_assign_type = NET_ADDR_RANDOM; | |
1524 | eth_random_addr(dev->perm_addr); | |
1da177e4 LT |
1525 | } |
1526 | ||
1527 | ||
1528 | /** | |
3144581c | 1529 | * ip6_tnl_dev_init_gen - general initializer for all tunnel devices |
1da177e4 LT |
1530 | * @dev: virtual device associated with tunnel |
1531 | **/ | |
1532 | ||
8560f226 | 1533 | static inline int |
3144581c | 1534 | ip6_tnl_dev_init_gen(struct net_device *dev) |
1da177e4 | 1535 | { |
2941a486 | 1536 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 | 1537 | |
1da177e4 | 1538 | t->dev = dev; |
0bd87628 | 1539 | t->net = dev_net(dev); |
1c213bd2 | 1540 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
8560f226 ED |
1541 | if (!dev->tstats) |
1542 | return -ENOMEM; | |
1543 | return 0; | |
1da177e4 LT |
1544 | } |
1545 | ||
1546 | /** | |
3144581c | 1547 | * ip6_tnl_dev_init - initializer for all non fallback tunnel devices |
1da177e4 LT |
1548 | * @dev: virtual device associated with tunnel |
1549 | **/ | |
1550 | ||
8560f226 | 1551 | static int ip6_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1552 | { |
2941a486 | 1553 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 ED |
1554 | int err = ip6_tnl_dev_init_gen(dev); |
1555 | ||
1556 | if (err) | |
1557 | return err; | |
3144581c | 1558 | ip6_tnl_link_config(t); |
8560f226 | 1559 | return 0; |
1da177e4 LT |
1560 | } |
1561 | ||
1562 | /** | |
3144581c | 1563 | * ip6_fb_tnl_dev_init - initializer for fallback tunnel device |
1da177e4 LT |
1564 | * @dev: fallback device |
1565 | * | |
1566 | * Return: 0 | |
1567 | **/ | |
1568 | ||
8560f226 | 1569 | static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1570 | { |
2941a486 | 1571 | struct ip6_tnl *t = netdev_priv(dev); |
3e6c9fb5 PE |
1572 | struct net *net = dev_net(dev); |
1573 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
8560f226 ED |
1574 | int err = ip6_tnl_dev_init_gen(dev); |
1575 | ||
1576 | if (err) | |
1577 | return err; | |
3e6c9fb5 | 1578 | |
502b0935 | 1579 | t->parms.proto = IPPROTO_IPV6; |
1da177e4 | 1580 | dev_hold(dev); |
d0087b29 VN |
1581 | |
1582 | ip6_tnl_link_config(t); | |
1583 | ||
cf778b00 | 1584 | rcu_assign_pointer(ip6n->tnls_wc[0], t); |
8560f226 | 1585 | return 0; |
1da177e4 LT |
1586 | } |
1587 | ||
0b112457 ND |
1588 | static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[]) |
1589 | { | |
1590 | u8 proto; | |
1591 | ||
c8965932 | 1592 | if (!data || !data[IFLA_IPTUN_PROTO]) |
0b112457 ND |
1593 | return 0; |
1594 | ||
1595 | proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1596 | if (proto != IPPROTO_IPV6 && | |
1597 | proto != IPPROTO_IPIP && | |
1598 | proto != 0) | |
1599 | return -EINVAL; | |
1600 | ||
1601 | return 0; | |
1602 | } | |
1603 | ||
1604 | static void ip6_tnl_netlink_parms(struct nlattr *data[], | |
1605 | struct __ip6_tnl_parm *parms) | |
1606 | { | |
1607 | memset(parms, 0, sizeof(*parms)); | |
1608 | ||
1609 | if (!data) | |
1610 | return; | |
1611 | ||
1612 | if (data[IFLA_IPTUN_LINK]) | |
1613 | parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); | |
1614 | ||
1615 | if (data[IFLA_IPTUN_LOCAL]) | |
1616 | nla_memcpy(&parms->laddr, data[IFLA_IPTUN_LOCAL], | |
1617 | sizeof(struct in6_addr)); | |
1618 | ||
1619 | if (data[IFLA_IPTUN_REMOTE]) | |
1620 | nla_memcpy(&parms->raddr, data[IFLA_IPTUN_REMOTE], | |
1621 | sizeof(struct in6_addr)); | |
1622 | ||
1623 | if (data[IFLA_IPTUN_TTL]) | |
1624 | parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]); | |
1625 | ||
1626 | if (data[IFLA_IPTUN_ENCAP_LIMIT]) | |
1627 | parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]); | |
1628 | ||
1629 | if (data[IFLA_IPTUN_FLOWINFO]) | |
1ff05fb7 | 1630 | parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]); |
0b112457 ND |
1631 | |
1632 | if (data[IFLA_IPTUN_FLAGS]) | |
1633 | parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]); | |
1634 | ||
1635 | if (data[IFLA_IPTUN_PROTO]) | |
1636 | parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1637 | } | |
1638 | ||
1639 | static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev, | |
1640 | struct nlattr *tb[], struct nlattr *data[]) | |
1641 | { | |
1642 | struct net *net = dev_net(dev); | |
1643 | struct ip6_tnl *nt; | |
1644 | ||
1645 | nt = netdev_priv(dev); | |
1646 | ip6_tnl_netlink_parms(data, &nt->parms); | |
1647 | ||
1648 | if (ip6_tnl_locate(net, &nt->parms, 0)) | |
1649 | return -EEXIST; | |
1650 | ||
1651 | return ip6_tnl_create2(dev); | |
1652 | } | |
1653 | ||
1654 | static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[], | |
1655 | struct nlattr *data[]) | |
1656 | { | |
0bd87628 | 1657 | struct ip6_tnl *t = netdev_priv(dev); |
0b112457 | 1658 | struct __ip6_tnl_parm p; |
0bd87628 | 1659 | struct net *net = t->net; |
0b112457 ND |
1660 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1661 | ||
1662 | if (dev == ip6n->fb_tnl_dev) | |
1663 | return -EINVAL; | |
1664 | ||
1665 | ip6_tnl_netlink_parms(data, &p); | |
1666 | ||
1667 | t = ip6_tnl_locate(net, &p, 0); | |
1668 | ||
1669 | if (t) { | |
1670 | if (t->dev != dev) | |
1671 | return -EEXIST; | |
1672 | } else | |
1673 | t = netdev_priv(dev); | |
1674 | ||
1675 | return ip6_tnl_update(t, &p); | |
1676 | } | |
1677 | ||
1e9f3d6f ND |
1678 | static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head) |
1679 | { | |
1680 | struct net *net = dev_net(dev); | |
1681 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1682 | ||
1683 | if (dev != ip6n->fb_tnl_dev) | |
1684 | unregister_netdevice_queue(dev, head); | |
1685 | } | |
1686 | ||
b58d731a | 1687 | static size_t ip6_tnl_get_size(const struct net_device *dev) |
c075b130 ND |
1688 | { |
1689 | return | |
1690 | /* IFLA_IPTUN_LINK */ | |
1691 | nla_total_size(4) + | |
1692 | /* IFLA_IPTUN_LOCAL */ | |
1693 | nla_total_size(sizeof(struct in6_addr)) + | |
1694 | /* IFLA_IPTUN_REMOTE */ | |
1695 | nla_total_size(sizeof(struct in6_addr)) + | |
1696 | /* IFLA_IPTUN_TTL */ | |
1697 | nla_total_size(1) + | |
1698 | /* IFLA_IPTUN_ENCAP_LIMIT */ | |
1699 | nla_total_size(1) + | |
1700 | /* IFLA_IPTUN_FLOWINFO */ | |
1701 | nla_total_size(4) + | |
1702 | /* IFLA_IPTUN_FLAGS */ | |
1703 | nla_total_size(4) + | |
cfa323b6 ND |
1704 | /* IFLA_IPTUN_PROTO */ |
1705 | nla_total_size(1) + | |
c075b130 ND |
1706 | 0; |
1707 | } | |
1708 | ||
b58d731a | 1709 | static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev) |
c075b130 ND |
1710 | { |
1711 | struct ip6_tnl *tunnel = netdev_priv(dev); | |
1712 | struct __ip6_tnl_parm *parm = &tunnel->parms; | |
1713 | ||
1714 | if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || | |
1715 | nla_put(skb, IFLA_IPTUN_LOCAL, sizeof(struct in6_addr), | |
c075b130 | 1716 | &parm->laddr) || |
0d2ede92 DZ |
1717 | nla_put(skb, IFLA_IPTUN_REMOTE, sizeof(struct in6_addr), |
1718 | &parm->raddr) || | |
c075b130 ND |
1719 | nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) || |
1720 | nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) || | |
1721 | nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) || | |
cfa323b6 ND |
1722 | nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) || |
1723 | nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto)) | |
c075b130 ND |
1724 | goto nla_put_failure; |
1725 | return 0; | |
1726 | ||
1727 | nla_put_failure: | |
1728 | return -EMSGSIZE; | |
1729 | } | |
1730 | ||
0b112457 ND |
1731 | static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = { |
1732 | [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, | |
1733 | [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) }, | |
1734 | [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) }, | |
1735 | [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, | |
1736 | [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 }, | |
1737 | [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 }, | |
1738 | [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 }, | |
1739 | [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, | |
1740 | }; | |
1741 | ||
c075b130 ND |
1742 | static struct rtnl_link_ops ip6_link_ops __read_mostly = { |
1743 | .kind = "ip6tnl", | |
1744 | .maxtype = IFLA_IPTUN_MAX, | |
0b112457 | 1745 | .policy = ip6_tnl_policy, |
c075b130 | 1746 | .priv_size = sizeof(struct ip6_tnl), |
0b112457 ND |
1747 | .setup = ip6_tnl_dev_setup, |
1748 | .validate = ip6_tnl_validate, | |
1749 | .newlink = ip6_tnl_newlink, | |
1750 | .changelink = ip6_tnl_changelink, | |
1e9f3d6f | 1751 | .dellink = ip6_tnl_dellink, |
b58d731a ND |
1752 | .get_size = ip6_tnl_get_size, |
1753 | .fill_info = ip6_tnl_fill_info, | |
c075b130 ND |
1754 | }; |
1755 | ||
3ff2cfa5 | 1756 | static struct xfrm6_tunnel ip4ip6_handler __read_mostly = { |
c4d3efaf YK |
1757 | .handler = ip4ip6_rcv, |
1758 | .err_handler = ip4ip6_err, | |
1759 | .priority = 1, | |
1760 | }; | |
1761 | ||
3ff2cfa5 | 1762 | static struct xfrm6_tunnel ip6ip6_handler __read_mostly = { |
0303770d PM |
1763 | .handler = ip6ip6_rcv, |
1764 | .err_handler = ip6ip6_err, | |
d2acc347 | 1765 | .priority = 1, |
1da177e4 LT |
1766 | }; |
1767 | ||
1e9f3d6f | 1768 | static void __net_exit ip6_tnl_destroy_tunnels(struct net *net) |
3e6c9fb5 | 1769 | { |
1e9f3d6f | 1770 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
0bd87628 | 1771 | struct net_device *dev, *aux; |
3e6c9fb5 PE |
1772 | int h; |
1773 | struct ip6_tnl *t; | |
cf4432f5 | 1774 | LIST_HEAD(list); |
3e6c9fb5 | 1775 | |
0bd87628 ND |
1776 | for_each_netdev_safe(net, dev, aux) |
1777 | if (dev->rtnl_link_ops == &ip6_link_ops) | |
1778 | unregister_netdevice_queue(dev, &list); | |
1779 | ||
3e6c9fb5 | 1780 | for (h = 0; h < HASH_SIZE; h++) { |
94767632 | 1781 | t = rtnl_dereference(ip6n->tnls_r_l[h]); |
cf4432f5 | 1782 | while (t != NULL) { |
0bd87628 ND |
1783 | /* If dev is in the same netns, it has already |
1784 | * been added to the list by the previous loop. | |
1785 | */ | |
1786 | if (!net_eq(dev_net(t->dev), net)) | |
1787 | unregister_netdevice_queue(t->dev, &list); | |
94767632 | 1788 | t = rtnl_dereference(t->next); |
cf4432f5 | 1789 | } |
3e6c9fb5 PE |
1790 | } |
1791 | ||
cf4432f5 | 1792 | unregister_netdevice_many(&list); |
3e6c9fb5 PE |
1793 | } |
1794 | ||
2c8c1e72 | 1795 | static int __net_init ip6_tnl_init_net(struct net *net) |
13eeb8e9 | 1796 | { |
ac31cd3c | 1797 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
731abb9c | 1798 | struct ip6_tnl *t = NULL; |
13eeb8e9 | 1799 | int err; |
13eeb8e9 | 1800 | |
3e6c9fb5 PE |
1801 | ip6n->tnls[0] = ip6n->tnls_wc; |
1802 | ip6n->tnls[1] = ip6n->tnls_r_l; | |
1803 | ||
15820e12 PE |
1804 | err = -ENOMEM; |
1805 | ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", | |
c835a677 | 1806 | NET_NAME_UNKNOWN, ip6_tnl_dev_setup); |
15820e12 PE |
1807 | |
1808 | if (!ip6n->fb_tnl_dev) | |
1809 | goto err_alloc_dev; | |
be77e593 | 1810 | dev_net_set(ip6n->fb_tnl_dev, net); |
bb814094 | 1811 | ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops; |
0bd87628 ND |
1812 | /* FB netdevice is special: we have one, and only one per netns. |
1813 | * Allowing to move it to another netns is clearly unsafe. | |
1814 | */ | |
1815 | ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL; | |
15820e12 | 1816 | |
8560f226 ED |
1817 | err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); |
1818 | if (err < 0) | |
1819 | goto err_register; | |
15820e12 PE |
1820 | |
1821 | err = register_netdev(ip6n->fb_tnl_dev); | |
1822 | if (err < 0) | |
1823 | goto err_register; | |
731abb9c JB |
1824 | |
1825 | t = netdev_priv(ip6n->fb_tnl_dev); | |
1826 | ||
1827 | strcpy(t->parms.name, ip6n->fb_tnl_dev->name); | |
13eeb8e9 PE |
1828 | return 0; |
1829 | ||
15820e12 | 1830 | err_register: |
8560f226 | 1831 | ip6_dev_free(ip6n->fb_tnl_dev); |
15820e12 | 1832 | err_alloc_dev: |
13eeb8e9 PE |
1833 | return err; |
1834 | } | |
1835 | ||
2c8c1e72 | 1836 | static void __net_exit ip6_tnl_exit_net(struct net *net) |
13eeb8e9 | 1837 | { |
3e6c9fb5 | 1838 | rtnl_lock(); |
1e9f3d6f | 1839 | ip6_tnl_destroy_tunnels(net); |
3e6c9fb5 | 1840 | rtnl_unlock(); |
13eeb8e9 PE |
1841 | } |
1842 | ||
1843 | static struct pernet_operations ip6_tnl_net_ops = { | |
1844 | .init = ip6_tnl_init_net, | |
1845 | .exit = ip6_tnl_exit_net, | |
ac31cd3c EB |
1846 | .id = &ip6_tnl_net_id, |
1847 | .size = sizeof(struct ip6_tnl_net), | |
13eeb8e9 PE |
1848 | }; |
1849 | ||
1da177e4 LT |
1850 | /** |
1851 | * ip6_tunnel_init - register protocol and reserve needed resources | |
1852 | * | |
1853 | * Return: 0 on success | |
1854 | **/ | |
1855 | ||
1856 | static int __init ip6_tunnel_init(void) | |
1857 | { | |
1858 | int err; | |
1859 | ||
d5aa407f AD |
1860 | err = register_pernet_device(&ip6_tnl_net_ops); |
1861 | if (err < 0) | |
1862 | goto out_pernet; | |
1863 | ||
1864 | err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET); | |
1865 | if (err < 0) { | |
f3213831 | 1866 | pr_err("%s: can't register ip4ip6\n", __func__); |
d5aa407f | 1867 | goto out_ip4ip6; |
c4d3efaf YK |
1868 | } |
1869 | ||
d5aa407f AD |
1870 | err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6); |
1871 | if (err < 0) { | |
f3213831 | 1872 | pr_err("%s: can't register ip6ip6\n", __func__); |
d5aa407f | 1873 | goto out_ip6ip6; |
1da177e4 | 1874 | } |
c075b130 ND |
1875 | err = rtnl_link_register(&ip6_link_ops); |
1876 | if (err < 0) | |
1877 | goto rtnl_link_failed; | |
13eeb8e9 | 1878 | |
1da177e4 | 1879 | return 0; |
d5aa407f | 1880 | |
c075b130 ND |
1881 | rtnl_link_failed: |
1882 | xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6); | |
d5aa407f | 1883 | out_ip6ip6: |
c4d3efaf | 1884 | xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); |
d5aa407f AD |
1885 | out_ip4ip6: |
1886 | unregister_pernet_device(&ip6_tnl_net_ops); | |
1887 | out_pernet: | |
1da177e4 LT |
1888 | return err; |
1889 | } | |
1890 | ||
1891 | /** | |
1892 | * ip6_tunnel_cleanup - free resources and unregister protocol | |
1893 | **/ | |
1894 | ||
1895 | static void __exit ip6_tunnel_cleanup(void) | |
1896 | { | |
c075b130 | 1897 | rtnl_link_unregister(&ip6_link_ops); |
c4d3efaf | 1898 | if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) |
f3213831 | 1899 | pr_info("%s: can't deregister ip4ip6\n", __func__); |
c4d3efaf | 1900 | |
73d605d1 | 1901 | if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) |
f3213831 | 1902 | pr_info("%s: can't deregister ip6ip6\n", __func__); |
1da177e4 | 1903 | |
ac31cd3c | 1904 | unregister_pernet_device(&ip6_tnl_net_ops); |
1da177e4 LT |
1905 | } |
1906 | ||
1907 | module_init(ip6_tunnel_init); | |
1908 | module_exit(ip6_tunnel_cleanup); |