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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); |
ea3dc960 | 186 | struct in6_addr any; |
1da177e4 | 187 | |
ddbe5032 | 188 | for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { |
1da177e4 LT |
189 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
190 | ipv6_addr_equal(remote, &t->parms.raddr) && | |
191 | (t->dev->flags & IFF_UP)) | |
192 | return t; | |
193 | } | |
ea3dc960 SK |
194 | |
195 | memset(&any, 0, sizeof(any)); | |
196 | hash = HASH(&any, local); | |
197 | for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { | |
198 | if (ipv6_addr_equal(local, &t->parms.laddr) && | |
199 | (t->dev->flags & IFF_UP)) | |
200 | return t; | |
201 | } | |
202 | ||
203 | hash = HASH(remote, &any); | |
204 | for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { | |
205 | if (ipv6_addr_equal(remote, &t->parms.raddr) && | |
206 | (t->dev->flags & IFF_UP)) | |
207 | return t; | |
208 | } | |
209 | ||
2922bc8a ED |
210 | t = rcu_dereference(ip6n->tnls_wc[0]); |
211 | if (t && (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
212 | return t; |
213 | ||
214 | return NULL; | |
215 | } | |
216 | ||
217 | /** | |
3144581c | 218 | * ip6_tnl_bucket - get head of list matching given tunnel parameters |
1ab1457c | 219 | * @p: parameters containing tunnel end-points |
1da177e4 LT |
220 | * |
221 | * Description: | |
3144581c | 222 | * ip6_tnl_bucket() returns the head of the list matching the |
1da177e4 LT |
223 | * &struct in6_addr entries laddr and raddr in @p. |
224 | * | |
1ab1457c | 225 | * Return: head of IPv6 tunnel list |
1da177e4 LT |
226 | **/ |
227 | ||
94767632 | 228 | static struct ip6_tnl __rcu ** |
c12b395a | 229 | ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p) |
1da177e4 | 230 | { |
b71d1d42 ED |
231 | const struct in6_addr *remote = &p->raddr; |
232 | const struct in6_addr *local = &p->laddr; | |
95c96174 | 233 | unsigned int h = 0; |
1da177e4 LT |
234 | int prio = 0; |
235 | ||
236 | if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { | |
237 | prio = 1; | |
ddbe5032 | 238 | h = HASH(remote, local); |
1da177e4 | 239 | } |
3e6c9fb5 | 240 | return &ip6n->tnls[prio][h]; |
1da177e4 LT |
241 | } |
242 | ||
243 | /** | |
3144581c | 244 | * ip6_tnl_link - add tunnel to hash table |
1da177e4 LT |
245 | * @t: tunnel to be added |
246 | **/ | |
247 | ||
248 | static void | |
2dd02c89 | 249 | ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 250 | { |
94767632 | 251 | struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms); |
1da177e4 | 252 | |
cf778b00 ED |
253 | rcu_assign_pointer(t->next , rtnl_dereference(*tp)); |
254 | rcu_assign_pointer(*tp, t); | |
1da177e4 LT |
255 | } |
256 | ||
257 | /** | |
3144581c | 258 | * ip6_tnl_unlink - remove tunnel from hash table |
1da177e4 LT |
259 | * @t: tunnel to be removed |
260 | **/ | |
261 | ||
262 | static void | |
2dd02c89 | 263 | ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 264 | { |
94767632 ED |
265 | struct ip6_tnl __rcu **tp; |
266 | struct ip6_tnl *iter; | |
267 | ||
268 | for (tp = ip6_tnl_bucket(ip6n, &t->parms); | |
269 | (iter = rtnl_dereference(*tp)) != NULL; | |
270 | tp = &iter->next) { | |
271 | if (t == iter) { | |
cf778b00 | 272 | rcu_assign_pointer(*tp, t->next); |
1da177e4 LT |
273 | break; |
274 | } | |
275 | } | |
276 | } | |
277 | ||
8560f226 ED |
278 | static void ip6_dev_free(struct net_device *dev) |
279 | { | |
280 | free_percpu(dev->tstats); | |
281 | free_netdev(dev); | |
282 | } | |
283 | ||
0b112457 ND |
284 | static int ip6_tnl_create2(struct net_device *dev) |
285 | { | |
286 | struct ip6_tnl *t = netdev_priv(dev); | |
287 | struct net *net = dev_net(dev); | |
288 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
289 | int err; | |
290 | ||
291 | t = netdev_priv(dev); | |
0b112457 ND |
292 | |
293 | err = register_netdevice(dev); | |
294 | if (err < 0) | |
295 | goto out; | |
296 | ||
297 | strcpy(t->parms.name, dev->name); | |
298 | dev->rtnl_link_ops = &ip6_link_ops; | |
299 | ||
300 | dev_hold(dev); | |
301 | ip6_tnl_link(ip6n, t); | |
302 | return 0; | |
303 | ||
304 | out: | |
305 | return err; | |
306 | } | |
307 | ||
1da177e4 | 308 | /** |
2c53040f | 309 | * ip6_tnl_create - create a new tunnel |
1da177e4 LT |
310 | * @p: tunnel parameters |
311 | * @pt: pointer to new tunnel | |
312 | * | |
313 | * Description: | |
314 | * Create tunnel matching given parameters. | |
1ab1457c YH |
315 | * |
316 | * Return: | |
567131a7 | 317 | * created tunnel or NULL |
1da177e4 LT |
318 | **/ |
319 | ||
c12b395a | 320 | static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p) |
1da177e4 LT |
321 | { |
322 | struct net_device *dev; | |
323 | struct ip6_tnl *t; | |
324 | char name[IFNAMSIZ]; | |
325 | int err; | |
326 | ||
34cc7ba6 | 327 | if (p->name[0]) |
1da177e4 | 328 | strlcpy(name, p->name, IFNAMSIZ); |
34cc7ba6 PE |
329 | else |
330 | sprintf(name, "ip6tnl%%d"); | |
331 | ||
c835a677 TG |
332 | dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, |
333 | ip6_tnl_dev_setup); | |
1da177e4 | 334 | if (dev == NULL) |
567131a7 | 335 | goto failed; |
1da177e4 | 336 | |
554eb277 PE |
337 | dev_net_set(dev, net); |
338 | ||
2941a486 | 339 | t = netdev_priv(dev); |
1da177e4 | 340 | t->parms = *p; |
0bd87628 | 341 | t->net = dev_net(dev); |
0b112457 | 342 | err = ip6_tnl_create2(dev); |
8560f226 ED |
343 | if (err < 0) |
344 | goto failed_free; | |
1da177e4 | 345 | |
567131a7 | 346 | return t; |
b37d428b PE |
347 | |
348 | failed_free: | |
8560f226 | 349 | ip6_dev_free(dev); |
567131a7 VN |
350 | failed: |
351 | return NULL; | |
1da177e4 LT |
352 | } |
353 | ||
354 | /** | |
3144581c | 355 | * ip6_tnl_locate - find or create tunnel matching given parameters |
1ab1457c | 356 | * @p: tunnel parameters |
1da177e4 LT |
357 | * @create: != 0 if allowed to create new tunnel if no match found |
358 | * | |
359 | * Description: | |
3144581c | 360 | * ip6_tnl_locate() first tries to locate an existing tunnel |
1da177e4 LT |
361 | * based on @parms. If this is unsuccessful, but @create is set a new |
362 | * tunnel device is created and registered for use. | |
363 | * | |
364 | * Return: | |
567131a7 | 365 | * matching tunnel or NULL |
1da177e4 LT |
366 | **/ |
367 | ||
2dd02c89 | 368 | static struct ip6_tnl *ip6_tnl_locate(struct net *net, |
c12b395a | 369 | struct __ip6_tnl_parm *p, int create) |
1da177e4 | 370 | { |
b71d1d42 ED |
371 | const struct in6_addr *remote = &p->raddr; |
372 | const struct in6_addr *local = &p->laddr; | |
94767632 | 373 | struct ip6_tnl __rcu **tp; |
1da177e4 | 374 | struct ip6_tnl *t; |
2dd02c89 | 375 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 376 | |
94767632 ED |
377 | for (tp = ip6_tnl_bucket(ip6n, p); |
378 | (t = rtnl_dereference(*tp)) != NULL; | |
379 | tp = &t->next) { | |
1da177e4 | 380 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
2b0bb01b SK |
381 | ipv6_addr_equal(remote, &t->parms.raddr)) { |
382 | if (create) | |
383 | return NULL; | |
384 | ||
567131a7 | 385 | return t; |
2b0bb01b | 386 | } |
1da177e4 LT |
387 | } |
388 | if (!create) | |
567131a7 | 389 | return NULL; |
2dd02c89 | 390 | return ip6_tnl_create(net, p); |
1da177e4 LT |
391 | } |
392 | ||
393 | /** | |
3144581c | 394 | * ip6_tnl_dev_uninit - tunnel device uninitializer |
1da177e4 | 395 | * @dev: the device to be destroyed |
1ab1457c | 396 | * |
1da177e4 | 397 | * Description: |
3144581c | 398 | * ip6_tnl_dev_uninit() removes tunnel from its list |
1da177e4 LT |
399 | **/ |
400 | ||
401 | static void | |
3144581c | 402 | ip6_tnl_dev_uninit(struct net_device *dev) |
1da177e4 | 403 | { |
2941a486 | 404 | struct ip6_tnl *t = netdev_priv(dev); |
0bd87628 | 405 | struct net *net = t->net; |
2dd02c89 | 406 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 407 | |
94767632 | 408 | if (dev == ip6n->fb_tnl_dev) |
a9b3cd7f | 409 | RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL); |
94767632 | 410 | else |
2dd02c89 | 411 | ip6_tnl_unlink(ip6n, t); |
1da177e4 LT |
412 | ip6_tnl_dst_reset(t); |
413 | dev_put(dev); | |
414 | } | |
415 | ||
416 | /** | |
417 | * parse_tvl_tnl_enc_lim - handle encapsulation limit option | |
418 | * @skb: received socket buffer | |
419 | * | |
1ab1457c YH |
420 | * Return: |
421 | * 0 if none was found, | |
1da177e4 LT |
422 | * else index to encapsulation limit |
423 | **/ | |
424 | ||
c12b395a | 425 | __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw) |
1da177e4 | 426 | { |
b71d1d42 | 427 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw; |
1da177e4 | 428 | __u8 nexthdr = ipv6h->nexthdr; |
67ba4152 | 429 | __u16 off = sizeof(*ipv6h); |
1da177e4 LT |
430 | |
431 | while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { | |
432 | __u16 optlen = 0; | |
433 | struct ipv6_opt_hdr *hdr; | |
67ba4152 | 434 | if (raw + off + sizeof(*hdr) > skb->data && |
1da177e4 LT |
435 | !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr))) |
436 | break; | |
437 | ||
438 | hdr = (struct ipv6_opt_hdr *) (raw + off); | |
439 | if (nexthdr == NEXTHDR_FRAGMENT) { | |
440 | struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; | |
441 | if (frag_hdr->frag_off) | |
442 | break; | |
443 | optlen = 8; | |
444 | } else if (nexthdr == NEXTHDR_AUTH) { | |
445 | optlen = (hdr->hdrlen + 2) << 2; | |
446 | } else { | |
447 | optlen = ipv6_optlen(hdr); | |
448 | } | |
449 | if (nexthdr == NEXTHDR_DEST) { | |
450 | __u16 i = off + 2; | |
451 | while (1) { | |
452 | struct ipv6_tlv_tnl_enc_lim *tel; | |
453 | ||
454 | /* No more room for encapsulation limit */ | |
455 | if (i + sizeof (*tel) > off + optlen) | |
456 | break; | |
457 | ||
458 | tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i]; | |
459 | /* return index of option if found and valid */ | |
460 | if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && | |
461 | tel->length == 1) | |
462 | return i; | |
463 | /* else jump to next option */ | |
464 | if (tel->type) | |
465 | i += tel->length + 2; | |
466 | else | |
467 | i++; | |
468 | } | |
469 | } | |
470 | nexthdr = hdr->nexthdr; | |
471 | off += optlen; | |
472 | } | |
473 | return 0; | |
474 | } | |
c12b395a | 475 | EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim); |
1da177e4 LT |
476 | |
477 | /** | |
e490d1d8 | 478 | * ip6_tnl_err - tunnel error handler |
1da177e4 LT |
479 | * |
480 | * Description: | |
e490d1d8 | 481 | * ip6_tnl_err() should handle errors in the tunnel according |
1da177e4 LT |
482 | * to the specifications in RFC 2473. |
483 | **/ | |
484 | ||
d2acc347 | 485 | static int |
502b0935 | 486 | ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, |
d5fdd6ba | 487 | u8 *type, u8 *code, int *msg, __u32 *info, int offset) |
1da177e4 | 488 | { |
b71d1d42 | 489 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data; |
1da177e4 LT |
490 | struct ip6_tnl *t; |
491 | int rel_msg = 0; | |
d5fdd6ba BH |
492 | u8 rel_type = ICMPV6_DEST_UNREACH; |
493 | u8 rel_code = ICMPV6_ADDR_UNREACH; | |
acf722f7 | 494 | u8 tproto; |
1da177e4 LT |
495 | __u32 rel_info = 0; |
496 | __u16 len; | |
d2acc347 | 497 | int err = -ENOENT; |
1da177e4 | 498 | |
1ab1457c YH |
499 | /* If the packet doesn't contain the original IPv6 header we are |
500 | in trouble since we might need the source address for further | |
1da177e4 LT |
501 | processing of the error. */ |
502 | ||
2922bc8a | 503 | rcu_read_lock(); |
8704ca7e | 504 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, |
2dd02c89 | 505 | &ipv6h->saddr)) == NULL) |
1da177e4 LT |
506 | goto out; |
507 | ||
acf722f7 AA |
508 | tproto = ACCESS_ONCE(t->parms.proto); |
509 | if (tproto != ipproto && tproto != 0) | |
502b0935 YK |
510 | goto out; |
511 | ||
d2acc347 HX |
512 | err = 0; |
513 | ||
e490d1d8 | 514 | switch (*type) { |
1da177e4 LT |
515 | __u32 teli; |
516 | struct ipv6_tlv_tnl_enc_lim *tel; | |
517 | __u32 mtu; | |
518 | case ICMPV6_DEST_UNREACH: | |
e87cc472 JP |
519 | net_warn_ratelimited("%s: Path to destination invalid or inactive!\n", |
520 | t->parms.name); | |
1da177e4 LT |
521 | rel_msg = 1; |
522 | break; | |
523 | case ICMPV6_TIME_EXCEED: | |
e490d1d8 | 524 | if ((*code) == ICMPV6_EXC_HOPLIMIT) { |
e87cc472 JP |
525 | net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", |
526 | t->parms.name); | |
1da177e4 LT |
527 | rel_msg = 1; |
528 | } | |
529 | break; | |
530 | case ICMPV6_PARAMPROB: | |
107a5fe6 | 531 | teli = 0; |
e490d1d8 | 532 | if ((*code) == ICMPV6_HDR_FIELD) |
c12b395a | 533 | teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); |
1da177e4 | 534 | |
704eae1f | 535 | if (teli && teli == *info - 2) { |
1da177e4 LT |
536 | tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; |
537 | if (tel->encap_limit == 0) { | |
e87cc472 JP |
538 | net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", |
539 | t->parms.name); | |
1da177e4 LT |
540 | rel_msg = 1; |
541 | } | |
e87cc472 JP |
542 | } else { |
543 | net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n", | |
544 | t->parms.name); | |
1da177e4 LT |
545 | } |
546 | break; | |
547 | case ICMPV6_PKT_TOOBIG: | |
704eae1f | 548 | mtu = *info - offset; |
1da177e4 LT |
549 | if (mtu < IPV6_MIN_MTU) |
550 | mtu = IPV6_MIN_MTU; | |
551 | t->dev->mtu = mtu; | |
552 | ||
67ba4152 | 553 | if ((len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) { |
1da177e4 LT |
554 | rel_type = ICMPV6_PKT_TOOBIG; |
555 | rel_code = 0; | |
556 | rel_info = mtu; | |
557 | rel_msg = 1; | |
558 | } | |
559 | break; | |
560 | } | |
e490d1d8 YK |
561 | |
562 | *type = rel_type; | |
563 | *code = rel_code; | |
564 | *info = rel_info; | |
565 | *msg = rel_msg; | |
566 | ||
567 | out: | |
2922bc8a | 568 | rcu_read_unlock(); |
e490d1d8 YK |
569 | return err; |
570 | } | |
571 | ||
c4d3efaf YK |
572 | static int |
573 | ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 574 | u8 type, u8 code, int offset, __be32 info) |
c4d3efaf YK |
575 | { |
576 | int rel_msg = 0; | |
d5fdd6ba BH |
577 | u8 rel_type = type; |
578 | u8 rel_code = code; | |
704eae1f | 579 | __u32 rel_info = ntohl(info); |
c4d3efaf YK |
580 | int err; |
581 | struct sk_buff *skb2; | |
b71d1d42 | 582 | const struct iphdr *eiph; |
c4d3efaf | 583 | struct rtable *rt; |
31e4543d | 584 | struct flowi4 fl4; |
c4d3efaf | 585 | |
502b0935 YK |
586 | err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, |
587 | &rel_msg, &rel_info, offset); | |
c4d3efaf YK |
588 | if (err < 0) |
589 | return err; | |
590 | ||
591 | if (rel_msg == 0) | |
592 | return 0; | |
593 | ||
594 | switch (rel_type) { | |
595 | case ICMPV6_DEST_UNREACH: | |
596 | if (rel_code != ICMPV6_ADDR_UNREACH) | |
597 | return 0; | |
598 | rel_type = ICMP_DEST_UNREACH; | |
599 | rel_code = ICMP_HOST_UNREACH; | |
600 | break; | |
601 | case ICMPV6_PKT_TOOBIG: | |
602 | if (rel_code != 0) | |
603 | return 0; | |
604 | rel_type = ICMP_DEST_UNREACH; | |
605 | rel_code = ICMP_FRAG_NEEDED; | |
606 | break; | |
ec18d9a2 DM |
607 | case NDISC_REDIRECT: |
608 | rel_type = ICMP_REDIRECT; | |
609 | rel_code = ICMP_REDIR_HOST; | |
c4d3efaf YK |
610 | default: |
611 | return 0; | |
612 | } | |
613 | ||
614 | if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) | |
615 | return 0; | |
616 | ||
617 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
618 | if (!skb2) | |
619 | return 0; | |
620 | ||
adf30907 ED |
621 | skb_dst_drop(skb2); |
622 | ||
c4d3efaf | 623 | skb_pull(skb2, offset); |
c1d2bbe1 | 624 | skb_reset_network_header(skb2); |
eddc9ec5 | 625 | eiph = ip_hdr(skb2); |
c4d3efaf YK |
626 | |
627 | /* Try to guess incoming interface */ | |
31e4543d | 628 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, |
78fbfd8a DM |
629 | eiph->saddr, 0, |
630 | 0, 0, | |
631 | IPPROTO_IPIP, RT_TOS(eiph->tos), 0); | |
b23dd4fe | 632 | if (IS_ERR(rt)) |
c4d3efaf YK |
633 | goto out; |
634 | ||
d8d1f30b | 635 | skb2->dev = rt->dst.dev; |
c4d3efaf YK |
636 | |
637 | /* route "incoming" packet */ | |
638 | if (rt->rt_flags & RTCF_LOCAL) { | |
639 | ip_rt_put(rt); | |
640 | rt = NULL; | |
31e4543d | 641 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, |
78fbfd8a DM |
642 | eiph->daddr, eiph->saddr, |
643 | 0, 0, | |
644 | IPPROTO_IPIP, | |
645 | RT_TOS(eiph->tos), 0); | |
b23dd4fe | 646 | if (IS_ERR(rt) || |
d8d1f30b | 647 | rt->dst.dev->type != ARPHRD_TUNNEL) { |
b23dd4fe DM |
648 | if (!IS_ERR(rt)) |
649 | ip_rt_put(rt); | |
c4d3efaf YK |
650 | goto out; |
651 | } | |
b23dd4fe | 652 | skb_dst_set(skb2, &rt->dst); |
c4d3efaf YK |
653 | } else { |
654 | ip_rt_put(rt); | |
655 | if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, | |
656 | skb2->dev) || | |
adf30907 | 657 | skb_dst(skb2)->dev->type != ARPHRD_TUNNEL) |
c4d3efaf YK |
658 | goto out; |
659 | } | |
660 | ||
661 | /* change mtu on this route */ | |
662 | if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { | |
adf30907 | 663 | if (rel_info > dst_mtu(skb_dst(skb2))) |
c4d3efaf YK |
664 | goto out; |
665 | ||
6700c270 | 666 | skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2, rel_info); |
c4d3efaf | 667 | } |
1ed5c48f | 668 | if (rel_type == ICMP_REDIRECT) |
6700c270 | 669 | skb_dst(skb2)->ops->redirect(skb_dst(skb2), NULL, skb2); |
c4d3efaf | 670 | |
704eae1f | 671 | icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); |
c4d3efaf YK |
672 | |
673 | out: | |
674 | kfree_skb(skb2); | |
675 | return 0; | |
676 | } | |
677 | ||
e490d1d8 YK |
678 | static int |
679 | ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 680 | u8 type, u8 code, int offset, __be32 info) |
e490d1d8 YK |
681 | { |
682 | int rel_msg = 0; | |
d5fdd6ba BH |
683 | u8 rel_type = type; |
684 | u8 rel_code = code; | |
704eae1f | 685 | __u32 rel_info = ntohl(info); |
e490d1d8 YK |
686 | int err; |
687 | ||
502b0935 YK |
688 | err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, |
689 | &rel_msg, &rel_info, offset); | |
e490d1d8 YK |
690 | if (err < 0) |
691 | return err; | |
692 | ||
693 | if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { | |
1da177e4 LT |
694 | struct rt6_info *rt; |
695 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
305d4b3c | 696 | |
1da177e4 | 697 | if (!skb2) |
e490d1d8 | 698 | return 0; |
1da177e4 | 699 | |
adf30907 | 700 | skb_dst_drop(skb2); |
1da177e4 | 701 | skb_pull(skb2, offset); |
c1d2bbe1 | 702 | skb_reset_network_header(skb2); |
1da177e4 LT |
703 | |
704 | /* Try to guess incoming interface */ | |
2f7f54b7 PE |
705 | rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, |
706 | NULL, 0, 0); | |
1da177e4 | 707 | |
d1918542 DM |
708 | if (rt && rt->dst.dev) |
709 | skb2->dev = rt->dst.dev; | |
1da177e4 | 710 | |
3ffe533c | 711 | icmpv6_send(skb2, rel_type, rel_code, rel_info); |
1da177e4 | 712 | |
94e187c0 | 713 | ip6_rt_put(rt); |
1da177e4 LT |
714 | |
715 | kfree_skb(skb2); | |
716 | } | |
e490d1d8 YK |
717 | |
718 | return 0; | |
1da177e4 LT |
719 | } |
720 | ||
f4e0b4c5 ND |
721 | static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
722 | const struct ipv6hdr *ipv6h, | |
723 | struct sk_buff *skb) | |
c4d3efaf YK |
724 | { |
725 | __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; | |
726 | ||
727 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) | |
eddc9ec5 | 728 | ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); |
c4d3efaf | 729 | |
f4e0b4c5 | 730 | return IP6_ECN_decapsulate(ipv6h, skb); |
c4d3efaf YK |
731 | } |
732 | ||
f4e0b4c5 ND |
733 | static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
734 | const struct ipv6hdr *ipv6h, | |
735 | struct sk_buff *skb) | |
1da177e4 | 736 | { |
8359925b | 737 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) |
29bb43b4 | 738 | ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); |
1da177e4 | 739 | |
f4e0b4c5 | 740 | return IP6_ECN_decapsulate(ipv6h, skb); |
1da177e4 | 741 | } |
8359925b | 742 | |
c12b395a | 743 | __u32 ip6_tnl_get_cap(struct ip6_tnl *t, |
d0087b29 VN |
744 | const struct in6_addr *laddr, |
745 | const struct in6_addr *raddr) | |
746 | { | |
c12b395a | 747 | struct __ip6_tnl_parm *p = &t->parms; |
d0087b29 VN |
748 | int ltype = ipv6_addr_type(laddr); |
749 | int rtype = ipv6_addr_type(raddr); | |
750 | __u32 flags = 0; | |
751 | ||
752 | if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) { | |
753 | flags = IP6_TNL_F_CAP_PER_PACKET; | |
754 | } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
755 | rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
756 | !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && | |
757 | (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { | |
758 | if (ltype&IPV6_ADDR_UNICAST) | |
759 | flags |= IP6_TNL_F_CAP_XMIT; | |
760 | if (rtype&IPV6_ADDR_UNICAST) | |
761 | flags |= IP6_TNL_F_CAP_RCV; | |
762 | } | |
763 | return flags; | |
764 | } | |
c12b395a | 765 | EXPORT_SYMBOL(ip6_tnl_get_cap); |
d0087b29 | 766 | |
f1a28eab | 767 | /* called with rcu_read_lock() */ |
c12b395a | 768 | int ip6_tnl_rcv_ctl(struct ip6_tnl *t, |
d0087b29 VN |
769 | const struct in6_addr *laddr, |
770 | const struct in6_addr *raddr) | |
09c6bbf0 | 771 | { |
c12b395a | 772 | struct __ip6_tnl_parm *p = &t->parms; |
09c6bbf0 | 773 | int ret = 0; |
0bd87628 | 774 | struct net *net = t->net; |
09c6bbf0 | 775 | |
d0087b29 VN |
776 | if ((p->flags & IP6_TNL_F_CAP_RCV) || |
777 | ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && | |
778 | (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) { | |
1ab1457c | 779 | struct net_device *ldev = NULL; |
09c6bbf0 VN |
780 | |
781 | if (p->link) | |
f1a28eab | 782 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 783 | |
d0087b29 VN |
784 | if ((ipv6_addr_is_multicast(laddr) || |
785 | likely(ipv6_chk_addr(net, laddr, ldev, 0))) && | |
786 | likely(!ipv6_chk_addr(net, raddr, NULL, 0))) | |
09c6bbf0 | 787 | ret = 1; |
09c6bbf0 VN |
788 | } |
789 | return ret; | |
790 | } | |
c12b395a | 791 | EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl); |
1da177e4 LT |
792 | |
793 | /** | |
3144581c | 794 | * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally |
1da177e4 | 795 | * @skb: received socket buffer |
8359925b YK |
796 | * @protocol: ethernet protocol ID |
797 | * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN | |
1da177e4 LT |
798 | * |
799 | * Return: 0 | |
800 | **/ | |
801 | ||
8359925b | 802 | static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol, |
502b0935 | 803 | __u8 ipproto, |
f4e0b4c5 ND |
804 | int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, |
805 | const struct ipv6hdr *ipv6h, | |
806 | struct sk_buff *skb)) | |
1da177e4 | 807 | { |
1da177e4 | 808 | struct ip6_tnl *t; |
b71d1d42 | 809 | const struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
acf722f7 | 810 | u8 tproto; |
f4e0b4c5 | 811 | int err; |
1da177e4 | 812 | |
2922bc8a | 813 | rcu_read_lock(); |
1da177e4 | 814 | |
8704ca7e | 815 | if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, |
2dd02c89 | 816 | &ipv6h->daddr)) != NULL) { |
8f84985f | 817 | struct pcpu_sw_netstats *tstats; |
8560f226 | 818 | |
acf722f7 AA |
819 | tproto = ACCESS_ONCE(t->parms.proto); |
820 | if (tproto != ipproto && tproto != 0) { | |
2922bc8a | 821 | rcu_read_unlock(); |
502b0935 YK |
822 | goto discard; |
823 | } | |
824 | ||
1da177e4 | 825 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
2922bc8a | 826 | rcu_read_unlock(); |
50fba2aa | 827 | goto discard; |
1da177e4 LT |
828 | } |
829 | ||
d0087b29 | 830 | if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) { |
3dca02af | 831 | t->dev->stats.rx_dropped++; |
2922bc8a | 832 | rcu_read_unlock(); |
1da177e4 LT |
833 | goto discard; |
834 | } | |
b0e380b1 | 835 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 836 | skb_reset_network_header(skb); |
8359925b | 837 | skb->protocol = htons(protocol); |
1da177e4 | 838 | memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); |
8359925b | 839 | |
ea23192e | 840 | __skb_tunnel_rx(skb, t->dev, t->net); |
f4e0b4c5 ND |
841 | |
842 | err = dscp_ecn_decapsulate(t, ipv6h, skb); | |
843 | if (unlikely(err)) { | |
844 | if (log_ecn_error) | |
845 | net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n", | |
846 | &ipv6h->saddr, | |
847 | ipv6_get_dsfield(ipv6h)); | |
848 | if (err > 1) { | |
849 | ++t->dev->stats.rx_frame_errors; | |
850 | ++t->dev->stats.rx_errors; | |
851 | rcu_read_unlock(); | |
852 | goto discard; | |
853 | } | |
854 | } | |
855 | ||
8560f226 | 856 | tstats = this_cpu_ptr(t->dev->tstats); |
abb6013c | 857 | u64_stats_update_begin(&tstats->syncp); |
8560f226 ED |
858 | tstats->rx_packets++; |
859 | tstats->rx_bytes += skb->len; | |
abb6013c | 860 | u64_stats_update_end(&tstats->syncp); |
8560f226 | 861 | |
caf586e5 | 862 | netif_rx(skb); |
8990f468 | 863 | |
2922bc8a | 864 | rcu_read_unlock(); |
1da177e4 LT |
865 | return 0; |
866 | } | |
2922bc8a | 867 | rcu_read_unlock(); |
1da177e4 | 868 | return 1; |
50fba2aa HX |
869 | |
870 | discard: | |
871 | kfree_skb(skb); | |
872 | return 0; | |
1da177e4 LT |
873 | } |
874 | ||
c4d3efaf YK |
875 | static int ip4ip6_rcv(struct sk_buff *skb) |
876 | { | |
502b0935 YK |
877 | return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP, |
878 | ip4ip6_dscp_ecn_decapsulate); | |
c4d3efaf YK |
879 | } |
880 | ||
8359925b YK |
881 | static int ip6ip6_rcv(struct sk_buff *skb) |
882 | { | |
502b0935 YK |
883 | return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6, |
884 | ip6ip6_dscp_ecn_decapsulate); | |
8359925b YK |
885 | } |
886 | ||
6fb32dde VN |
887 | struct ipv6_tel_txoption { |
888 | struct ipv6_txoptions ops; | |
889 | __u8 dst_opt[8]; | |
890 | }; | |
1da177e4 | 891 | |
6fb32dde VN |
892 | static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) |
893 | { | |
894 | memset(opt, 0, sizeof(struct ipv6_tel_txoption)); | |
1da177e4 | 895 | |
6fb32dde VN |
896 | opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; |
897 | opt->dst_opt[3] = 1; | |
898 | opt->dst_opt[4] = encap_limit; | |
899 | opt->dst_opt[5] = IPV6_TLV_PADN; | |
900 | opt->dst_opt[6] = 1; | |
1da177e4 | 901 | |
6fb32dde VN |
902 | opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; |
903 | opt->ops.opt_nflen = 8; | |
1da177e4 LT |
904 | } |
905 | ||
906 | /** | |
3144581c | 907 | * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own |
1da177e4 | 908 | * @t: the outgoing tunnel device |
1ab1457c | 909 | * @hdr: IPv6 header from the incoming packet |
1da177e4 LT |
910 | * |
911 | * Description: | |
1ab1457c | 912 | * Avoid trivial tunneling loop by checking that tunnel exit-point |
1da177e4 LT |
913 | * doesn't match source of incoming packet. |
914 | * | |
1ab1457c | 915 | * Return: |
1da177e4 LT |
916 | * 1 if conflict, |
917 | * 0 else | |
918 | **/ | |
919 | ||
92113bfd | 920 | static inline bool |
b71d1d42 | 921 | ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) |
1da177e4 LT |
922 | { |
923 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
924 | } | |
925 | ||
d5005140 SK |
926 | int ip6_tnl_xmit_ctl(struct ip6_tnl *t, |
927 | const struct in6_addr *laddr, | |
928 | const struct in6_addr *raddr) | |
09c6bbf0 | 929 | { |
c12b395a | 930 | struct __ip6_tnl_parm *p = &t->parms; |
09c6bbf0 | 931 | int ret = 0; |
0bd87628 | 932 | struct net *net = t->net; |
09c6bbf0 | 933 | |
d5005140 SK |
934 | if ((p->flags & IP6_TNL_F_CAP_XMIT) || |
935 | ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && | |
936 | (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) { | |
09c6bbf0 VN |
937 | struct net_device *ldev = NULL; |
938 | ||
f1a28eab | 939 | rcu_read_lock(); |
09c6bbf0 | 940 | if (p->link) |
f1a28eab | 941 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 942 | |
d5005140 | 943 | if (unlikely(!ipv6_chk_addr(net, laddr, ldev, 0))) |
f3213831 JP |
944 | pr_warn("%s xmit: Local address not yet configured!\n", |
945 | p->name); | |
d5005140 SK |
946 | else if (!ipv6_addr_is_multicast(raddr) && |
947 | unlikely(ipv6_chk_addr(net, raddr, NULL, 0))) | |
f3213831 JP |
948 | pr_warn("%s xmit: Routing loop! Remote address found on this node!\n", |
949 | p->name); | |
09c6bbf0 VN |
950 | else |
951 | ret = 1; | |
f1a28eab | 952 | rcu_read_unlock(); |
09c6bbf0 VN |
953 | } |
954 | return ret; | |
955 | } | |
c12b395a | 956 | EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl); |
957 | ||
1da177e4 | 958 | /** |
61ec2aec | 959 | * ip6_tnl_xmit2 - encapsulate packet and send |
1da177e4 | 960 | * @skb: the outgoing socket buffer |
1ab1457c | 961 | * @dev: the outgoing tunnel device |
61ec2aec YK |
962 | * @dsfield: dscp code for outer header |
963 | * @fl: flow of tunneled packet | |
964 | * @encap_limit: encapsulation limit | |
965 | * @pmtu: Path MTU is stored if packet is too big | |
1da177e4 LT |
966 | * |
967 | * Description: | |
968 | * Build new header and do some sanity checks on the packet before sending | |
969 | * it. | |
970 | * | |
1ab1457c | 971 | * Return: |
c4d3efaf | 972 | * 0 on success |
61ec2aec YK |
973 | * -1 fail |
974 | * %-EMSGSIZE message too big. return mtu in this case. | |
1da177e4 LT |
975 | **/ |
976 | ||
61ec2aec YK |
977 | static int ip6_tnl_xmit2(struct sk_buff *skb, |
978 | struct net_device *dev, | |
979 | __u8 dsfield, | |
4c9483b2 | 980 | struct flowi6 *fl6, |
61ec2aec YK |
981 | int encap_limit, |
982 | __u32 *pmtu) | |
1da177e4 | 983 | { |
2941a486 | 984 | struct ip6_tnl *t = netdev_priv(dev); |
0bd87628 | 985 | struct net *net = t->net; |
3dca02af | 986 | struct net_device_stats *stats = &t->dev->stats; |
0660e03f | 987 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
6fb32dde | 988 | struct ipv6_tel_txoption opt; |
d24f22f3 | 989 | struct dst_entry *dst = NULL, *ndst = NULL; |
1da177e4 LT |
990 | struct net_device *tdev; |
991 | int mtu; | |
c2636b4d | 992 | unsigned int max_headroom = sizeof(struct ipv6hdr); |
1da177e4 | 993 | u8 proto; |
61ec2aec | 994 | int err = -1; |
1da177e4 | 995 | |
ea3dc960 SK |
996 | /* NBMA tunnel */ |
997 | if (ipv6_addr_any(&t->parms.raddr)) { | |
998 | struct in6_addr *addr6; | |
999 | struct neighbour *neigh; | |
1000 | int addr_type; | |
1001 | ||
1002 | if (!skb_dst(skb)) | |
1003 | goto tx_err_link_failure; | |
1004 | ||
1005 | neigh = dst_neigh_lookup(skb_dst(skb), | |
1006 | &ipv6_hdr(skb)->daddr); | |
1007 | if (!neigh) | |
1008 | goto tx_err_link_failure; | |
1009 | ||
1010 | addr6 = (struct in6_addr *)&neigh->primary_key; | |
1011 | addr_type = ipv6_addr_type(addr6); | |
1012 | ||
1013 | if (addr_type == IPV6_ADDR_ANY) | |
1014 | addr6 = &ipv6_hdr(skb)->daddr; | |
1015 | ||
1016 | memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr)); | |
1017 | neigh_release(neigh); | |
1018 | } else if (!fl6->flowi6_mark) | |
d24f22f3 | 1019 | dst = ip6_tnl_dst_check(t); |
d5005140 SK |
1020 | |
1021 | if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr)) | |
1022 | goto tx_err_link_failure; | |
1023 | ||
89b02126 ED |
1024 | if (!dst) { |
1025 | ndst = ip6_route_output(net, NULL, fl6); | |
1da177e4 | 1026 | |
89b02126 | 1027 | if (ndst->error) |
a57ebc90 | 1028 | goto tx_err_link_failure; |
89b02126 ED |
1029 | ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0); |
1030 | if (IS_ERR(ndst)) { | |
1031 | err = PTR_ERR(ndst); | |
1032 | ndst = NULL; | |
452edd59 DM |
1033 | goto tx_err_link_failure; |
1034 | } | |
89b02126 | 1035 | dst = ndst; |
a57ebc90 | 1036 | } |
1da177e4 LT |
1037 | |
1038 | tdev = dst->dev; | |
1039 | ||
1040 | if (tdev == dev) { | |
1041 | stats->collisions++; | |
e87cc472 JP |
1042 | net_warn_ratelimited("%s: Local routing loop detected!\n", |
1043 | t->parms.name); | |
1da177e4 LT |
1044 | goto tx_err_dst_release; |
1045 | } | |
67ba4152 | 1046 | mtu = dst_mtu(dst) - sizeof(*ipv6h); |
6fb32dde | 1047 | if (encap_limit >= 0) { |
1da177e4 LT |
1048 | max_headroom += 8; |
1049 | mtu -= 8; | |
1050 | } | |
1051 | if (mtu < IPV6_MIN_MTU) | |
1052 | mtu = IPV6_MIN_MTU; | |
adf30907 | 1053 | if (skb_dst(skb)) |
6700c270 | 1054 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); |
1da177e4 | 1055 | if (skb->len > mtu) { |
61ec2aec YK |
1056 | *pmtu = mtu; |
1057 | err = -EMSGSIZE; | |
1da177e4 LT |
1058 | goto tx_err_dst_release; |
1059 | } | |
1060 | ||
963a88b3 | 1061 | skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev))); |
0bd87628 | 1062 | |
1da177e4 LT |
1063 | /* |
1064 | * Okay, now see if we can stuff it in the buffer as-is. | |
1065 | */ | |
1066 | max_headroom += LL_RESERVED_SPACE(tdev); | |
1ab1457c | 1067 | |
cfbba49d PM |
1068 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
1069 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 | 1070 | struct sk_buff *new_skb; |
1ab1457c | 1071 | |
1da177e4 LT |
1072 | if (!(new_skb = skb_realloc_headroom(skb, max_headroom))) |
1073 | goto tx_err_dst_release; | |
1074 | ||
1075 | if (skb->sk) | |
1076 | skb_set_owner_w(new_skb, skb->sk); | |
9ff26449 | 1077 | consume_skb(skb); |
1da177e4 LT |
1078 | skb = new_skb; |
1079 | } | |
d24f22f3 ED |
1080 | if (fl6->flowi6_mark) { |
1081 | skb_dst_set(skb, dst); | |
1082 | ndst = NULL; | |
1083 | } else { | |
1084 | skb_dst_set_noref(skb, dst); | |
1085 | } | |
b0e380b1 | 1086 | skb->transport_header = skb->network_header; |
1da177e4 | 1087 | |
4c9483b2 | 1088 | proto = fl6->flowi6_proto; |
6fb32dde VN |
1089 | if (encap_limit >= 0) { |
1090 | init_tel_txopt(&opt, encap_limit); | |
1091 | ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); | |
1092 | } | |
3d483058 HFS |
1093 | |
1094 | if (likely(!skb->encapsulation)) { | |
1095 | skb_reset_inner_headers(skb); | |
1096 | skb->encapsulation = 1; | |
1097 | } | |
1098 | ||
e2d1bca7 ACM |
1099 | skb_push(skb, sizeof(struct ipv6hdr)); |
1100 | skb_reset_network_header(skb); | |
0660e03f | 1101 | ipv6h = ipv6_hdr(skb); |
cb1ce2ef TH |
1102 | ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), |
1103 | ip6_make_flowlabel(net, skb, fl6->flowlabel, false)); | |
1da177e4 LT |
1104 | ipv6h->hop_limit = t->parms.hop_limit; |
1105 | ipv6h->nexthdr = proto; | |
4e3fd7a0 AD |
1106 | ipv6h->saddr = fl6->saddr; |
1107 | ipv6h->daddr = fl6->daddr; | |
e8f72ea4 | 1108 | ip6tunnel_xmit(skb, dev); |
89b02126 ED |
1109 | if (ndst) |
1110 | ip6_tnl_dst_store(t, ndst); | |
1da177e4 LT |
1111 | return 0; |
1112 | tx_err_link_failure: | |
1113 | stats->tx_carrier_errors++; | |
1114 | dst_link_failure(skb); | |
1115 | tx_err_dst_release: | |
89b02126 | 1116 | dst_release(ndst); |
61ec2aec YK |
1117 | return err; |
1118 | } | |
1119 | ||
c4d3efaf YK |
1120 | static inline int |
1121 | ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1122 | { | |
1123 | struct ip6_tnl *t = netdev_priv(dev); | |
b71d1d42 | 1124 | const struct iphdr *iph = ip_hdr(skb); |
c4d3efaf | 1125 | int encap_limit = -1; |
4c9483b2 | 1126 | struct flowi6 fl6; |
c4d3efaf YK |
1127 | __u8 dsfield; |
1128 | __u32 mtu; | |
acf722f7 | 1129 | u8 tproto; |
c4d3efaf YK |
1130 | int err; |
1131 | ||
acf722f7 | 1132 | tproto = ACCESS_ONCE(t->parms.proto); |
d5005140 | 1133 | if (tproto != IPPROTO_IPIP && tproto != 0) |
c4d3efaf YK |
1134 | return -1; |
1135 | ||
1136 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1137 | encap_limit = t->parms.encap_limit; | |
1138 | ||
67ba4152 | 1139 | memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); |
4c9483b2 | 1140 | fl6.flowi6_proto = IPPROTO_IPIP; |
c4d3efaf YK |
1141 | |
1142 | dsfield = ipv4_get_dsfield(iph); | |
1143 | ||
d24f22f3 | 1144 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
4c9483b2 | 1145 | fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) |
b77f2fa6 | 1146 | & IPV6_TCLASS_MASK; |
d24f22f3 ED |
1147 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
1148 | fl6.flowi6_mark = skb->mark; | |
c4d3efaf | 1149 | |
4c9483b2 | 1150 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); |
c4d3efaf YK |
1151 | if (err != 0) { |
1152 | /* XXX: send ICMP error even if DF is not set. */ | |
1153 | if (err == -EMSGSIZE) | |
1154 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
1155 | htonl(mtu)); | |
1156 | return -1; | |
1157 | } | |
1158 | ||
1159 | return 0; | |
1160 | } | |
1161 | ||
61ec2aec YK |
1162 | static inline int |
1163 | ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1164 | { | |
1165 | struct ip6_tnl *t = netdev_priv(dev); | |
0660e03f | 1166 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
61ec2aec YK |
1167 | int encap_limit = -1; |
1168 | __u16 offset; | |
4c9483b2 | 1169 | struct flowi6 fl6; |
61ec2aec YK |
1170 | __u8 dsfield; |
1171 | __u32 mtu; | |
acf722f7 | 1172 | u8 tproto; |
61ec2aec YK |
1173 | int err; |
1174 | ||
acf722f7 AA |
1175 | tproto = ACCESS_ONCE(t->parms.proto); |
1176 | if ((tproto != IPPROTO_IPV6 && tproto != 0) || | |
d5005140 | 1177 | ip6_tnl_addr_conflict(t, ipv6h)) |
61ec2aec YK |
1178 | return -1; |
1179 | ||
c12b395a | 1180 | offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); |
d56f90a7 | 1181 | if (offset > 0) { |
61ec2aec | 1182 | struct ipv6_tlv_tnl_enc_lim *tel; |
d56f90a7 | 1183 | tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; |
61ec2aec YK |
1184 | if (tel->encap_limit == 0) { |
1185 | icmpv6_send(skb, ICMPV6_PARAMPROB, | |
3ffe533c | 1186 | ICMPV6_HDR_FIELD, offset + 2); |
61ec2aec YK |
1187 | return -1; |
1188 | } | |
1189 | encap_limit = tel->encap_limit - 1; | |
1190 | } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1191 | encap_limit = t->parms.encap_limit; | |
1192 | ||
67ba4152 | 1193 | memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); |
4c9483b2 | 1194 | fl6.flowi6_proto = IPPROTO_IPV6; |
61ec2aec YK |
1195 | |
1196 | dsfield = ipv6_get_dsfield(ipv6h); | |
d24f22f3 | 1197 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
4c9483b2 | 1198 | fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); |
d24f22f3 | 1199 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) |
3308de2b | 1200 | fl6.flowlabel |= ip6_flowlabel(ipv6h); |
d24f22f3 ED |
1201 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
1202 | fl6.flowi6_mark = skb->mark; | |
61ec2aec | 1203 | |
4c9483b2 | 1204 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); |
61ec2aec YK |
1205 | if (err != 0) { |
1206 | if (err == -EMSGSIZE) | |
3ffe533c | 1207 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
61ec2aec YK |
1208 | return -1; |
1209 | } | |
1210 | ||
1211 | return 0; | |
1212 | } | |
1213 | ||
6fef4c0c | 1214 | static netdev_tx_t |
61ec2aec YK |
1215 | ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) |
1216 | { | |
1217 | struct ip6_tnl *t = netdev_priv(dev); | |
3dca02af | 1218 | struct net_device_stats *stats = &t->dev->stats; |
61ec2aec YK |
1219 | int ret; |
1220 | ||
61ec2aec | 1221 | switch (skb->protocol) { |
60678040 | 1222 | case htons(ETH_P_IP): |
c4d3efaf YK |
1223 | ret = ip4ip6_tnl_xmit(skb, dev); |
1224 | break; | |
60678040 | 1225 | case htons(ETH_P_IPV6): |
61ec2aec YK |
1226 | ret = ip6ip6_tnl_xmit(skb, dev); |
1227 | break; | |
1228 | default: | |
1229 | goto tx_err; | |
1230 | } | |
1231 | ||
1232 | if (ret < 0) | |
1233 | goto tx_err; | |
1234 | ||
6ed10654 | 1235 | return NETDEV_TX_OK; |
61ec2aec | 1236 | |
1da177e4 LT |
1237 | tx_err: |
1238 | stats->tx_errors++; | |
1239 | stats->tx_dropped++; | |
1240 | kfree_skb(skb); | |
6ed10654 | 1241 | return NETDEV_TX_OK; |
1da177e4 LT |
1242 | } |
1243 | ||
3144581c | 1244 | static void ip6_tnl_link_config(struct ip6_tnl *t) |
1da177e4 LT |
1245 | { |
1246 | struct net_device *dev = t->dev; | |
c12b395a | 1247 | struct __ip6_tnl_parm *p = &t->parms; |
4c9483b2 | 1248 | struct flowi6 *fl6 = &t->fl.u.ip6; |
1da177e4 | 1249 | |
3a6d54c5 JP |
1250 | memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); |
1251 | memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
1da177e4 LT |
1252 | |
1253 | /* Set up flowi template */ | |
4e3fd7a0 AD |
1254 | fl6->saddr = p->laddr; |
1255 | fl6->daddr = p->raddr; | |
4c9483b2 DM |
1256 | fl6->flowi6_oif = p->link; |
1257 | fl6->flowlabel = 0; | |
1da177e4 LT |
1258 | |
1259 | if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) | |
4c9483b2 | 1260 | fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; |
1da177e4 | 1261 | if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) |
4c9483b2 | 1262 | fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; |
1da177e4 | 1263 | |
d0087b29 VN |
1264 | p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); |
1265 | p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); | |
1da177e4 LT |
1266 | |
1267 | if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) | |
1268 | dev->flags |= IFF_POINTOPOINT; | |
1269 | else | |
1270 | dev->flags &= ~IFF_POINTOPOINT; | |
1271 | ||
1272 | dev->iflink = p->link; | |
1273 | ||
1274 | if (p->flags & IP6_TNL_F_CAP_XMIT) { | |
305d4b3c VN |
1275 | int strict = (ipv6_addr_type(&p->raddr) & |
1276 | (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); | |
1277 | ||
0bd87628 | 1278 | struct rt6_info *rt = rt6_lookup(t->net, |
2f7f54b7 | 1279 | &p->raddr, &p->laddr, |
305d4b3c | 1280 | p->link, strict); |
1da177e4 LT |
1281 | |
1282 | if (rt == NULL) | |
1283 | return; | |
1284 | ||
d1918542 DM |
1285 | if (rt->dst.dev) { |
1286 | dev->hard_header_len = rt->dst.dev->hard_header_len + | |
67ba4152 | 1287 | sizeof(struct ipv6hdr); |
1da177e4 | 1288 | |
67ba4152 | 1289 | dev->mtu = rt->dst.dev->mtu - sizeof(struct ipv6hdr); |
381601e5 | 1290 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
67ba4152 | 1291 | dev->mtu -= 8; |
1da177e4 LT |
1292 | |
1293 | if (dev->mtu < IPV6_MIN_MTU) | |
1294 | dev->mtu = IPV6_MIN_MTU; | |
1295 | } | |
94e187c0 | 1296 | ip6_rt_put(rt); |
1da177e4 LT |
1297 | } |
1298 | } | |
1299 | ||
1300 | /** | |
3144581c | 1301 | * ip6_tnl_change - update the tunnel parameters |
1da177e4 LT |
1302 | * @t: tunnel to be changed |
1303 | * @p: tunnel configuration parameters | |
1da177e4 LT |
1304 | * |
1305 | * Description: | |
3144581c | 1306 | * ip6_tnl_change() updates the tunnel parameters |
1da177e4 LT |
1307 | **/ |
1308 | ||
1309 | static int | |
c12b395a | 1310 | ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) |
1da177e4 | 1311 | { |
4e3fd7a0 AD |
1312 | t->parms.laddr = p->laddr; |
1313 | t->parms.raddr = p->raddr; | |
1da177e4 LT |
1314 | t->parms.flags = p->flags; |
1315 | t->parms.hop_limit = p->hop_limit; | |
1316 | t->parms.encap_limit = p->encap_limit; | |
1317 | t->parms.flowinfo = p->flowinfo; | |
8181b8c1 | 1318 | t->parms.link = p->link; |
502b0935 | 1319 | t->parms.proto = p->proto; |
0c088890 | 1320 | ip6_tnl_dst_reset(t); |
3144581c | 1321 | ip6_tnl_link_config(t); |
1da177e4 LT |
1322 | return 0; |
1323 | } | |
1324 | ||
0b112457 ND |
1325 | static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) |
1326 | { | |
0bd87628 | 1327 | struct net *net = t->net; |
0b112457 ND |
1328 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1329 | int err; | |
1330 | ||
1331 | ip6_tnl_unlink(ip6n, t); | |
1332 | synchronize_net(); | |
1333 | err = ip6_tnl_change(t, p); | |
1334 | ip6_tnl_link(ip6n, t); | |
1335 | netdev_state_change(t->dev); | |
1336 | return err; | |
1337 | } | |
1338 | ||
acf722f7 AA |
1339 | static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) |
1340 | { | |
1341 | /* for default tnl0 device allow to change only the proto */ | |
1342 | t->parms.proto = p->proto; | |
1343 | netdev_state_change(t->dev); | |
1344 | return 0; | |
1345 | } | |
1346 | ||
c12b395a | 1347 | static void |
1348 | ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u) | |
1349 | { | |
1350 | p->laddr = u->laddr; | |
1351 | p->raddr = u->raddr; | |
1352 | p->flags = u->flags; | |
1353 | p->hop_limit = u->hop_limit; | |
1354 | p->encap_limit = u->encap_limit; | |
1355 | p->flowinfo = u->flowinfo; | |
1356 | p->link = u->link; | |
1357 | p->proto = u->proto; | |
1358 | memcpy(p->name, u->name, sizeof(u->name)); | |
1359 | } | |
1360 | ||
1361 | static void | |
1362 | ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p) | |
1363 | { | |
1364 | u->laddr = p->laddr; | |
1365 | u->raddr = p->raddr; | |
1366 | u->flags = p->flags; | |
1367 | u->hop_limit = p->hop_limit; | |
1368 | u->encap_limit = p->encap_limit; | |
1369 | u->flowinfo = p->flowinfo; | |
1370 | u->link = p->link; | |
1371 | u->proto = p->proto; | |
1372 | memcpy(u->name, p->name, sizeof(u->name)); | |
1373 | } | |
1374 | ||
1da177e4 | 1375 | /** |
3144581c | 1376 | * ip6_tnl_ioctl - configure ipv6 tunnels from userspace |
1da177e4 LT |
1377 | * @dev: virtual device associated with tunnel |
1378 | * @ifr: parameters passed from userspace | |
1379 | * @cmd: command to be performed | |
1380 | * | |
1381 | * Description: | |
3144581c | 1382 | * ip6_tnl_ioctl() is used for managing IPv6 tunnels |
1ab1457c | 1383 | * from userspace. |
1da177e4 LT |
1384 | * |
1385 | * The possible commands are the following: | |
1386 | * %SIOCGETTUNNEL: get tunnel parameters for device | |
1387 | * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters | |
1388 | * %SIOCCHGTUNNEL: change tunnel parameters to those given | |
1389 | * %SIOCDELTUNNEL: delete tunnel | |
1390 | * | |
1ab1457c | 1391 | * The fallback device "ip6tnl0", created during module |
1da177e4 LT |
1392 | * initialization, can be used for creating other tunnel devices. |
1393 | * | |
1394 | * Return: | |
1395 | * 0 on success, | |
1396 | * %-EFAULT if unable to copy data to or from userspace, | |
1397 | * %-EPERM if current process hasn't %CAP_NET_ADMIN set | |
1398 | * %-EINVAL if passed tunnel parameters are invalid, | |
1399 | * %-EEXIST if changing a tunnel's parameters would cause a conflict | |
1400 | * %-ENODEV if attempting to change or delete a nonexisting device | |
1401 | **/ | |
1402 | ||
1403 | static int | |
3144581c | 1404 | ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
1da177e4 LT |
1405 | { |
1406 | int err = 0; | |
1da177e4 | 1407 | struct ip6_tnl_parm p; |
c12b395a | 1408 | struct __ip6_tnl_parm p1; |
74462f0d ND |
1409 | struct ip6_tnl *t = netdev_priv(dev); |
1410 | struct net *net = t->net; | |
2dd02c89 | 1411 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 LT |
1412 | |
1413 | switch (cmd) { | |
1414 | case SIOCGETTUNNEL: | |
15820e12 | 1415 | if (dev == ip6n->fb_tnl_dev) { |
67ba4152 | 1416 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
1da177e4 LT |
1417 | err = -EFAULT; |
1418 | break; | |
1419 | } | |
c12b395a | 1420 | ip6_tnl_parm_from_user(&p1, &p); |
1421 | t = ip6_tnl_locate(net, &p1, 0); | |
74462f0d ND |
1422 | if (t == NULL) |
1423 | t = netdev_priv(dev); | |
5ef5d6c5 DC |
1424 | } else { |
1425 | memset(&p, 0, sizeof(p)); | |
567131a7 | 1426 | } |
c12b395a | 1427 | ip6_tnl_parm_to_user(&p, &t->parms); |
67ba4152 | 1428 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) { |
1da177e4 LT |
1429 | err = -EFAULT; |
1430 | } | |
1431 | break; | |
1432 | case SIOCADDTUNNEL: | |
1433 | case SIOCCHGTUNNEL: | |
1434 | err = -EPERM; | |
af31f412 | 1435 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 1436 | break; |
567131a7 | 1437 | err = -EFAULT; |
67ba4152 | 1438 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
1da177e4 | 1439 | break; |
567131a7 | 1440 | err = -EINVAL; |
502b0935 YK |
1441 | if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && |
1442 | p.proto != 0) | |
1da177e4 | 1443 | break; |
c12b395a | 1444 | ip6_tnl_parm_from_user(&p1, &p); |
1445 | t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL); | |
acf722f7 | 1446 | if (cmd == SIOCCHGTUNNEL) { |
567131a7 VN |
1447 | if (t != NULL) { |
1448 | if (t->dev != dev) { | |
1449 | err = -EEXIST; | |
1450 | break; | |
1451 | } | |
1452 | } else | |
1453 | t = netdev_priv(dev); | |
acf722f7 AA |
1454 | if (dev == ip6n->fb_tnl_dev) |
1455 | err = ip6_tnl0_update(t, &p1); | |
1456 | else | |
1457 | err = ip6_tnl_update(t, &p1); | |
1da177e4 | 1458 | } |
567131a7 | 1459 | if (t) { |
1da177e4 | 1460 | err = 0; |
c12b395a | 1461 | ip6_tnl_parm_to_user(&p, &t->parms); |
1462 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
567131a7 VN |
1463 | err = -EFAULT; |
1464 | ||
1465 | } else | |
1466 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1da177e4 LT |
1467 | break; |
1468 | case SIOCDELTUNNEL: | |
1469 | err = -EPERM; | |
af31f412 | 1470 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1471 | break; |
1472 | ||
15820e12 | 1473 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 | 1474 | err = -EFAULT; |
67ba4152 | 1475 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
1da177e4 | 1476 | break; |
567131a7 | 1477 | err = -ENOENT; |
c12b395a | 1478 | ip6_tnl_parm_from_user(&p1, &p); |
1479 | t = ip6_tnl_locate(net, &p1, 0); | |
1480 | if (t == NULL) | |
1da177e4 | 1481 | break; |
567131a7 | 1482 | err = -EPERM; |
15820e12 | 1483 | if (t->dev == ip6n->fb_tnl_dev) |
1da177e4 | 1484 | break; |
567131a7 | 1485 | dev = t->dev; |
1da177e4 | 1486 | } |
22f8cde5 SH |
1487 | err = 0; |
1488 | unregister_netdevice(dev); | |
1da177e4 LT |
1489 | break; |
1490 | default: | |
1491 | err = -EINVAL; | |
1492 | } | |
1493 | return err; | |
1494 | } | |
1495 | ||
1da177e4 | 1496 | /** |
3144581c | 1497 | * ip6_tnl_change_mtu - change mtu manually for tunnel device |
1da177e4 LT |
1498 | * @dev: virtual device associated with tunnel |
1499 | * @new_mtu: the new mtu | |
1500 | * | |
1501 | * Return: | |
1502 | * 0 on success, | |
1503 | * %-EINVAL if mtu too small | |
1504 | **/ | |
1505 | ||
1506 | static int | |
3144581c | 1507 | ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) |
1da177e4 | 1508 | { |
582442d6 OG |
1509 | struct ip6_tnl *tnl = netdev_priv(dev); |
1510 | ||
1511 | if (tnl->parms.proto == IPPROTO_IPIP) { | |
1512 | if (new_mtu < 68) | |
1513 | return -EINVAL; | |
1514 | } else { | |
1515 | if (new_mtu < IPV6_MIN_MTU) | |
1516 | return -EINVAL; | |
1da177e4 | 1517 | } |
582442d6 OG |
1518 | if (new_mtu > 0xFFF8 - dev->hard_header_len) |
1519 | return -EINVAL; | |
1da177e4 LT |
1520 | dev->mtu = new_mtu; |
1521 | return 0; | |
1522 | } | |
1523 | ||
1326c3d5 SH |
1524 | |
1525 | static const struct net_device_ops ip6_tnl_netdev_ops = { | |
6c6151da | 1526 | .ndo_init = ip6_tnl_dev_init, |
8560f226 | 1527 | .ndo_uninit = ip6_tnl_dev_uninit, |
1326c3d5 | 1528 | .ndo_start_xmit = ip6_tnl_xmit, |
8560f226 | 1529 | .ndo_do_ioctl = ip6_tnl_ioctl, |
1326c3d5 | 1530 | .ndo_change_mtu = ip6_tnl_change_mtu, |
8560f226 | 1531 | .ndo_get_stats = ip6_get_stats, |
1326c3d5 SH |
1532 | }; |
1533 | ||
8560f226 | 1534 | |
1da177e4 | 1535 | /** |
3144581c | 1536 | * ip6_tnl_dev_setup - setup virtual tunnel device |
1da177e4 LT |
1537 | * @dev: virtual device associated with tunnel |
1538 | * | |
1539 | * Description: | |
1540 | * Initialize function pointers and device parameters | |
1541 | **/ | |
1542 | ||
3144581c | 1543 | static void ip6_tnl_dev_setup(struct net_device *dev) |
1da177e4 | 1544 | { |
381601e5 AF |
1545 | struct ip6_tnl *t; |
1546 | ||
1326c3d5 | 1547 | dev->netdev_ops = &ip6_tnl_netdev_ops; |
8560f226 | 1548 | dev->destructor = ip6_dev_free; |
1da177e4 LT |
1549 | |
1550 | dev->type = ARPHRD_TUNNEL6; | |
67ba4152 IM |
1551 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr); |
1552 | dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr); | |
381601e5 AF |
1553 | t = netdev_priv(dev); |
1554 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
67ba4152 | 1555 | dev->mtu -= 8; |
1da177e4 LT |
1556 | dev->flags |= IFF_NOARP; |
1557 | dev->addr_len = sizeof(struct in6_addr); | |
02875878 | 1558 | netif_keep_dst(dev); |
e837735e ND |
1559 | /* This perm addr will be used as interface identifier by IPv6 */ |
1560 | dev->addr_assign_type = NET_ADDR_RANDOM; | |
1561 | eth_random_addr(dev->perm_addr); | |
1da177e4 LT |
1562 | } |
1563 | ||
1564 | ||
1565 | /** | |
3144581c | 1566 | * ip6_tnl_dev_init_gen - general initializer for all tunnel devices |
1da177e4 LT |
1567 | * @dev: virtual device associated with tunnel |
1568 | **/ | |
1569 | ||
8560f226 | 1570 | static inline int |
3144581c | 1571 | ip6_tnl_dev_init_gen(struct net_device *dev) |
1da177e4 | 1572 | { |
2941a486 | 1573 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 | 1574 | |
1da177e4 | 1575 | t->dev = dev; |
0bd87628 | 1576 | t->net = dev_net(dev); |
1c213bd2 | 1577 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
8560f226 ED |
1578 | if (!dev->tstats) |
1579 | return -ENOMEM; | |
1580 | return 0; | |
1da177e4 LT |
1581 | } |
1582 | ||
1583 | /** | |
3144581c | 1584 | * ip6_tnl_dev_init - initializer for all non fallback tunnel devices |
1da177e4 LT |
1585 | * @dev: virtual device associated with tunnel |
1586 | **/ | |
1587 | ||
8560f226 | 1588 | static int ip6_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1589 | { |
2941a486 | 1590 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 ED |
1591 | int err = ip6_tnl_dev_init_gen(dev); |
1592 | ||
1593 | if (err) | |
1594 | return err; | |
3144581c | 1595 | ip6_tnl_link_config(t); |
8560f226 | 1596 | return 0; |
1da177e4 LT |
1597 | } |
1598 | ||
1599 | /** | |
3144581c | 1600 | * ip6_fb_tnl_dev_init - initializer for fallback tunnel device |
1da177e4 LT |
1601 | * @dev: fallback device |
1602 | * | |
1603 | * Return: 0 | |
1604 | **/ | |
1605 | ||
8560f226 | 1606 | static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1607 | { |
2941a486 | 1608 | struct ip6_tnl *t = netdev_priv(dev); |
3e6c9fb5 PE |
1609 | struct net *net = dev_net(dev); |
1610 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1611 | ||
502b0935 | 1612 | t->parms.proto = IPPROTO_IPV6; |
1da177e4 | 1613 | dev_hold(dev); |
d0087b29 | 1614 | |
cf778b00 | 1615 | rcu_assign_pointer(ip6n->tnls_wc[0], t); |
8560f226 | 1616 | return 0; |
1da177e4 LT |
1617 | } |
1618 | ||
0b112457 ND |
1619 | static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[]) |
1620 | { | |
1621 | u8 proto; | |
1622 | ||
c8965932 | 1623 | if (!data || !data[IFLA_IPTUN_PROTO]) |
0b112457 ND |
1624 | return 0; |
1625 | ||
1626 | proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1627 | if (proto != IPPROTO_IPV6 && | |
1628 | proto != IPPROTO_IPIP && | |
1629 | proto != 0) | |
1630 | return -EINVAL; | |
1631 | ||
1632 | return 0; | |
1633 | } | |
1634 | ||
1635 | static void ip6_tnl_netlink_parms(struct nlattr *data[], | |
1636 | struct __ip6_tnl_parm *parms) | |
1637 | { | |
1638 | memset(parms, 0, sizeof(*parms)); | |
1639 | ||
1640 | if (!data) | |
1641 | return; | |
1642 | ||
1643 | if (data[IFLA_IPTUN_LINK]) | |
1644 | parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); | |
1645 | ||
1646 | if (data[IFLA_IPTUN_LOCAL]) | |
1647 | nla_memcpy(&parms->laddr, data[IFLA_IPTUN_LOCAL], | |
1648 | sizeof(struct in6_addr)); | |
1649 | ||
1650 | if (data[IFLA_IPTUN_REMOTE]) | |
1651 | nla_memcpy(&parms->raddr, data[IFLA_IPTUN_REMOTE], | |
1652 | sizeof(struct in6_addr)); | |
1653 | ||
1654 | if (data[IFLA_IPTUN_TTL]) | |
1655 | parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]); | |
1656 | ||
1657 | if (data[IFLA_IPTUN_ENCAP_LIMIT]) | |
1658 | parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]); | |
1659 | ||
1660 | if (data[IFLA_IPTUN_FLOWINFO]) | |
1ff05fb7 | 1661 | parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]); |
0b112457 ND |
1662 | |
1663 | if (data[IFLA_IPTUN_FLAGS]) | |
1664 | parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]); | |
1665 | ||
1666 | if (data[IFLA_IPTUN_PROTO]) | |
1667 | parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1668 | } | |
1669 | ||
1670 | static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev, | |
1671 | struct nlattr *tb[], struct nlattr *data[]) | |
1672 | { | |
1673 | struct net *net = dev_net(dev); | |
1674 | struct ip6_tnl *nt; | |
1675 | ||
1676 | nt = netdev_priv(dev); | |
1677 | ip6_tnl_netlink_parms(data, &nt->parms); | |
1678 | ||
1679 | if (ip6_tnl_locate(net, &nt->parms, 0)) | |
1680 | return -EEXIST; | |
1681 | ||
1682 | return ip6_tnl_create2(dev); | |
1683 | } | |
1684 | ||
1685 | static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[], | |
1686 | struct nlattr *data[]) | |
1687 | { | |
0bd87628 | 1688 | struct ip6_tnl *t = netdev_priv(dev); |
0b112457 | 1689 | struct __ip6_tnl_parm p; |
0bd87628 | 1690 | struct net *net = t->net; |
0b112457 ND |
1691 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1692 | ||
1693 | if (dev == ip6n->fb_tnl_dev) | |
1694 | return -EINVAL; | |
1695 | ||
1696 | ip6_tnl_netlink_parms(data, &p); | |
1697 | ||
1698 | t = ip6_tnl_locate(net, &p, 0); | |
1699 | ||
1700 | if (t) { | |
1701 | if (t->dev != dev) | |
1702 | return -EEXIST; | |
1703 | } else | |
1704 | t = netdev_priv(dev); | |
1705 | ||
1706 | return ip6_tnl_update(t, &p); | |
1707 | } | |
1708 | ||
1e9f3d6f ND |
1709 | static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head) |
1710 | { | |
1711 | struct net *net = dev_net(dev); | |
1712 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1713 | ||
1714 | if (dev != ip6n->fb_tnl_dev) | |
1715 | unregister_netdevice_queue(dev, head); | |
1716 | } | |
1717 | ||
b58d731a | 1718 | static size_t ip6_tnl_get_size(const struct net_device *dev) |
c075b130 ND |
1719 | { |
1720 | return | |
1721 | /* IFLA_IPTUN_LINK */ | |
1722 | nla_total_size(4) + | |
1723 | /* IFLA_IPTUN_LOCAL */ | |
1724 | nla_total_size(sizeof(struct in6_addr)) + | |
1725 | /* IFLA_IPTUN_REMOTE */ | |
1726 | nla_total_size(sizeof(struct in6_addr)) + | |
1727 | /* IFLA_IPTUN_TTL */ | |
1728 | nla_total_size(1) + | |
1729 | /* IFLA_IPTUN_ENCAP_LIMIT */ | |
1730 | nla_total_size(1) + | |
1731 | /* IFLA_IPTUN_FLOWINFO */ | |
1732 | nla_total_size(4) + | |
1733 | /* IFLA_IPTUN_FLAGS */ | |
1734 | nla_total_size(4) + | |
cfa323b6 ND |
1735 | /* IFLA_IPTUN_PROTO */ |
1736 | nla_total_size(1) + | |
c075b130 ND |
1737 | 0; |
1738 | } | |
1739 | ||
b58d731a | 1740 | static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev) |
c075b130 ND |
1741 | { |
1742 | struct ip6_tnl *tunnel = netdev_priv(dev); | |
1743 | struct __ip6_tnl_parm *parm = &tunnel->parms; | |
1744 | ||
1745 | if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || | |
1746 | nla_put(skb, IFLA_IPTUN_LOCAL, sizeof(struct in6_addr), | |
c075b130 | 1747 | &parm->laddr) || |
0d2ede92 DZ |
1748 | nla_put(skb, IFLA_IPTUN_REMOTE, sizeof(struct in6_addr), |
1749 | &parm->raddr) || | |
c075b130 ND |
1750 | nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) || |
1751 | nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) || | |
1752 | nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) || | |
cfa323b6 ND |
1753 | nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) || |
1754 | nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto)) | |
c075b130 ND |
1755 | goto nla_put_failure; |
1756 | return 0; | |
1757 | ||
1758 | nla_put_failure: | |
1759 | return -EMSGSIZE; | |
1760 | } | |
1761 | ||
0b112457 ND |
1762 | static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = { |
1763 | [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, | |
1764 | [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) }, | |
1765 | [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) }, | |
1766 | [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, | |
1767 | [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 }, | |
1768 | [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 }, | |
1769 | [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 }, | |
1770 | [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, | |
1771 | }; | |
1772 | ||
c075b130 ND |
1773 | static struct rtnl_link_ops ip6_link_ops __read_mostly = { |
1774 | .kind = "ip6tnl", | |
1775 | .maxtype = IFLA_IPTUN_MAX, | |
0b112457 | 1776 | .policy = ip6_tnl_policy, |
c075b130 | 1777 | .priv_size = sizeof(struct ip6_tnl), |
0b112457 ND |
1778 | .setup = ip6_tnl_dev_setup, |
1779 | .validate = ip6_tnl_validate, | |
1780 | .newlink = ip6_tnl_newlink, | |
1781 | .changelink = ip6_tnl_changelink, | |
1e9f3d6f | 1782 | .dellink = ip6_tnl_dellink, |
b58d731a ND |
1783 | .get_size = ip6_tnl_get_size, |
1784 | .fill_info = ip6_tnl_fill_info, | |
c075b130 ND |
1785 | }; |
1786 | ||
3ff2cfa5 | 1787 | static struct xfrm6_tunnel ip4ip6_handler __read_mostly = { |
c4d3efaf YK |
1788 | .handler = ip4ip6_rcv, |
1789 | .err_handler = ip4ip6_err, | |
1790 | .priority = 1, | |
1791 | }; | |
1792 | ||
3ff2cfa5 | 1793 | static struct xfrm6_tunnel ip6ip6_handler __read_mostly = { |
0303770d PM |
1794 | .handler = ip6ip6_rcv, |
1795 | .err_handler = ip6ip6_err, | |
d2acc347 | 1796 | .priority = 1, |
1da177e4 LT |
1797 | }; |
1798 | ||
1e9f3d6f | 1799 | static void __net_exit ip6_tnl_destroy_tunnels(struct net *net) |
3e6c9fb5 | 1800 | { |
1e9f3d6f | 1801 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
0bd87628 | 1802 | struct net_device *dev, *aux; |
3e6c9fb5 PE |
1803 | int h; |
1804 | struct ip6_tnl *t; | |
cf4432f5 | 1805 | LIST_HEAD(list); |
3e6c9fb5 | 1806 | |
0bd87628 ND |
1807 | for_each_netdev_safe(net, dev, aux) |
1808 | if (dev->rtnl_link_ops == &ip6_link_ops) | |
1809 | unregister_netdevice_queue(dev, &list); | |
1810 | ||
3e6c9fb5 | 1811 | for (h = 0; h < HASH_SIZE; h++) { |
94767632 | 1812 | t = rtnl_dereference(ip6n->tnls_r_l[h]); |
cf4432f5 | 1813 | while (t != NULL) { |
0bd87628 ND |
1814 | /* If dev is in the same netns, it has already |
1815 | * been added to the list by the previous loop. | |
1816 | */ | |
1817 | if (!net_eq(dev_net(t->dev), net)) | |
1818 | unregister_netdevice_queue(t->dev, &list); | |
94767632 | 1819 | t = rtnl_dereference(t->next); |
cf4432f5 | 1820 | } |
3e6c9fb5 PE |
1821 | } |
1822 | ||
cf4432f5 | 1823 | unregister_netdevice_many(&list); |
3e6c9fb5 PE |
1824 | } |
1825 | ||
2c8c1e72 | 1826 | static int __net_init ip6_tnl_init_net(struct net *net) |
13eeb8e9 | 1827 | { |
ac31cd3c | 1828 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
731abb9c | 1829 | struct ip6_tnl *t = NULL; |
13eeb8e9 | 1830 | int err; |
13eeb8e9 | 1831 | |
3e6c9fb5 PE |
1832 | ip6n->tnls[0] = ip6n->tnls_wc; |
1833 | ip6n->tnls[1] = ip6n->tnls_r_l; | |
1834 | ||
15820e12 PE |
1835 | err = -ENOMEM; |
1836 | ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", | |
c835a677 | 1837 | NET_NAME_UNKNOWN, ip6_tnl_dev_setup); |
15820e12 PE |
1838 | |
1839 | if (!ip6n->fb_tnl_dev) | |
1840 | goto err_alloc_dev; | |
be77e593 | 1841 | dev_net_set(ip6n->fb_tnl_dev, net); |
bb814094 | 1842 | ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops; |
0bd87628 ND |
1843 | /* FB netdevice is special: we have one, and only one per netns. |
1844 | * Allowing to move it to another netns is clearly unsafe. | |
1845 | */ | |
1846 | ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL; | |
15820e12 | 1847 | |
8560f226 ED |
1848 | err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); |
1849 | if (err < 0) | |
1850 | goto err_register; | |
15820e12 PE |
1851 | |
1852 | err = register_netdev(ip6n->fb_tnl_dev); | |
1853 | if (err < 0) | |
1854 | goto err_register; | |
731abb9c JB |
1855 | |
1856 | t = netdev_priv(ip6n->fb_tnl_dev); | |
1857 | ||
1858 | strcpy(t->parms.name, ip6n->fb_tnl_dev->name); | |
13eeb8e9 PE |
1859 | return 0; |
1860 | ||
15820e12 | 1861 | err_register: |
8560f226 | 1862 | ip6_dev_free(ip6n->fb_tnl_dev); |
15820e12 | 1863 | err_alloc_dev: |
13eeb8e9 PE |
1864 | return err; |
1865 | } | |
1866 | ||
2c8c1e72 | 1867 | static void __net_exit ip6_tnl_exit_net(struct net *net) |
13eeb8e9 | 1868 | { |
3e6c9fb5 | 1869 | rtnl_lock(); |
1e9f3d6f | 1870 | ip6_tnl_destroy_tunnels(net); |
3e6c9fb5 | 1871 | rtnl_unlock(); |
13eeb8e9 PE |
1872 | } |
1873 | ||
1874 | static struct pernet_operations ip6_tnl_net_ops = { | |
1875 | .init = ip6_tnl_init_net, | |
1876 | .exit = ip6_tnl_exit_net, | |
ac31cd3c EB |
1877 | .id = &ip6_tnl_net_id, |
1878 | .size = sizeof(struct ip6_tnl_net), | |
13eeb8e9 PE |
1879 | }; |
1880 | ||
1da177e4 LT |
1881 | /** |
1882 | * ip6_tunnel_init - register protocol and reserve needed resources | |
1883 | * | |
1884 | * Return: 0 on success | |
1885 | **/ | |
1886 | ||
1887 | static int __init ip6_tunnel_init(void) | |
1888 | { | |
1889 | int err; | |
1890 | ||
d5aa407f AD |
1891 | err = register_pernet_device(&ip6_tnl_net_ops); |
1892 | if (err < 0) | |
1893 | goto out_pernet; | |
1894 | ||
1895 | err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET); | |
1896 | if (err < 0) { | |
f3213831 | 1897 | pr_err("%s: can't register ip4ip6\n", __func__); |
d5aa407f | 1898 | goto out_ip4ip6; |
c4d3efaf YK |
1899 | } |
1900 | ||
d5aa407f AD |
1901 | err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6); |
1902 | if (err < 0) { | |
f3213831 | 1903 | pr_err("%s: can't register ip6ip6\n", __func__); |
d5aa407f | 1904 | goto out_ip6ip6; |
1da177e4 | 1905 | } |
c075b130 ND |
1906 | err = rtnl_link_register(&ip6_link_ops); |
1907 | if (err < 0) | |
1908 | goto rtnl_link_failed; | |
13eeb8e9 | 1909 | |
1da177e4 | 1910 | return 0; |
d5aa407f | 1911 | |
c075b130 ND |
1912 | rtnl_link_failed: |
1913 | xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6); | |
d5aa407f | 1914 | out_ip6ip6: |
c4d3efaf | 1915 | xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); |
d5aa407f AD |
1916 | out_ip4ip6: |
1917 | unregister_pernet_device(&ip6_tnl_net_ops); | |
1918 | out_pernet: | |
1da177e4 LT |
1919 | return err; |
1920 | } | |
1921 | ||
1922 | /** | |
1923 | * ip6_tunnel_cleanup - free resources and unregister protocol | |
1924 | **/ | |
1925 | ||
1926 | static void __exit ip6_tunnel_cleanup(void) | |
1927 | { | |
c075b130 | 1928 | rtnl_link_unregister(&ip6_link_ops); |
c4d3efaf | 1929 | if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) |
f3213831 | 1930 | pr_info("%s: can't deregister ip4ip6\n", __func__); |
c4d3efaf | 1931 | |
73d605d1 | 1932 | if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) |
f3213831 | 1933 | pr_info("%s: can't deregister ip6ip6\n", __func__); |
1da177e4 | 1934 | |
ac31cd3c | 1935 | unregister_pernet_device(&ip6_tnl_net_ops); |
1da177e4 LT |
1936 | } |
1937 | ||
1938 | module_init(ip6_tunnel_init); | |
1939 | module_exit(ip6_tunnel_cleanup); |