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 | |
ddbe5032 ED |
67 | #define HASH_SIZE_SHIFT 5 |
68 | #define HASH_SIZE (1 << HASH_SIZE_SHIFT) | |
1da177e4 | 69 | |
f4e0b4c5 ND |
70 | static bool log_ecn_error = true; |
71 | module_param(log_ecn_error, bool, 0644); | |
72 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); | |
73 | ||
ddbe5032 ED |
74 | static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2) |
75 | { | |
76 | u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2); | |
77 | ||
78 | return hash_32(hash, HASH_SIZE_SHIFT); | |
79 | } | |
1da177e4 | 80 | |
8560f226 | 81 | static int ip6_tnl_dev_init(struct net_device *dev); |
3144581c | 82 | static void ip6_tnl_dev_setup(struct net_device *dev); |
c075b130 | 83 | static struct rtnl_link_ops ip6_link_ops __read_mostly; |
1da177e4 | 84 | |
f99189b1 | 85 | static int ip6_tnl_net_id __read_mostly; |
13eeb8e9 | 86 | struct ip6_tnl_net { |
15820e12 PE |
87 | /* the IPv6 tunnel fallback device */ |
88 | struct net_device *fb_tnl_dev; | |
3e6c9fb5 | 89 | /* lists for storing tunnels in use */ |
94767632 ED |
90 | struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE]; |
91 | struct ip6_tnl __rcu *tnls_wc[1]; | |
92 | struct ip6_tnl __rcu **tnls[2]; | |
13eeb8e9 PE |
93 | }; |
94 | ||
8560f226 ED |
95 | static struct net_device_stats *ip6_get_stats(struct net_device *dev) |
96 | { | |
56a4342d | 97 | struct pcpu_sw_netstats tmp, sum = { 0 }; |
8560f226 ED |
98 | int i; |
99 | ||
100 | for_each_possible_cpu(i) { | |
abb6013c | 101 | unsigned int start; |
8f84985f LR |
102 | const struct pcpu_sw_netstats *tstats = |
103 | per_cpu_ptr(dev->tstats, i); | |
8560f226 | 104 | |
abb6013c | 105 | do { |
57a7744e | 106 | start = u64_stats_fetch_begin_irq(&tstats->syncp); |
abb6013c LR |
107 | tmp.rx_packets = tstats->rx_packets; |
108 | tmp.rx_bytes = tstats->rx_bytes; | |
109 | tmp.tx_packets = tstats->tx_packets; | |
110 | tmp.tx_bytes = tstats->tx_bytes; | |
57a7744e | 111 | } while (u64_stats_fetch_retry_irq(&tstats->syncp, start)); |
abb6013c LR |
112 | |
113 | sum.rx_packets += tmp.rx_packets; | |
114 | sum.rx_bytes += tmp.rx_bytes; | |
115 | sum.tx_packets += tmp.tx_packets; | |
116 | sum.tx_bytes += tmp.tx_bytes; | |
8560f226 ED |
117 | } |
118 | dev->stats.rx_packets = sum.rx_packets; | |
119 | dev->stats.rx_bytes = sum.rx_bytes; | |
120 | dev->stats.tx_packets = sum.tx_packets; | |
121 | dev->stats.tx_bytes = sum.tx_bytes; | |
122 | return &dev->stats; | |
123 | } | |
124 | ||
1da177e4 | 125 | /** |
3144581c | 126 | * ip6_tnl_lookup - fetch tunnel matching the end-point addresses |
1ab1457c YH |
127 | * @remote: the address of the tunnel exit-point |
128 | * @local: the address of the tunnel entry-point | |
1da177e4 | 129 | * |
1ab1457c | 130 | * Return: |
1da177e4 | 131 | * tunnel matching given end-points if found, |
1ab1457c | 132 | * else fallback tunnel if its device is up, |
1da177e4 LT |
133 | * else %NULL |
134 | **/ | |
135 | ||
2922bc8a ED |
136 | #define for_each_ip6_tunnel_rcu(start) \ |
137 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) | |
138 | ||
1da177e4 | 139 | static struct ip6_tnl * |
b71d1d42 | 140 | ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local) |
1da177e4 | 141 | { |
ddbe5032 | 142 | unsigned int hash = HASH(remote, local); |
1da177e4 | 143 | struct ip6_tnl *t; |
3e6c9fb5 | 144 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
ea3dc960 | 145 | struct in6_addr any; |
1da177e4 | 146 | |
ddbe5032 | 147 | for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { |
1da177e4 LT |
148 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
149 | ipv6_addr_equal(remote, &t->parms.raddr) && | |
150 | (t->dev->flags & IFF_UP)) | |
151 | return t; | |
152 | } | |
ea3dc960 SK |
153 | |
154 | memset(&any, 0, sizeof(any)); | |
155 | hash = HASH(&any, local); | |
156 | for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { | |
157 | if (ipv6_addr_equal(local, &t->parms.laddr) && | |
158 | (t->dev->flags & IFF_UP)) | |
159 | return t; | |
160 | } | |
161 | ||
162 | hash = HASH(remote, &any); | |
163 | for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { | |
164 | if (ipv6_addr_equal(remote, &t->parms.raddr) && | |
165 | (t->dev->flags & IFF_UP)) | |
166 | return t; | |
167 | } | |
168 | ||
2922bc8a ED |
169 | t = rcu_dereference(ip6n->tnls_wc[0]); |
170 | if (t && (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
171 | return t; |
172 | ||
173 | return NULL; | |
174 | } | |
175 | ||
176 | /** | |
3144581c | 177 | * ip6_tnl_bucket - get head of list matching given tunnel parameters |
1ab1457c | 178 | * @p: parameters containing tunnel end-points |
1da177e4 LT |
179 | * |
180 | * Description: | |
3144581c | 181 | * ip6_tnl_bucket() returns the head of the list matching the |
1da177e4 LT |
182 | * &struct in6_addr entries laddr and raddr in @p. |
183 | * | |
1ab1457c | 184 | * Return: head of IPv6 tunnel list |
1da177e4 LT |
185 | **/ |
186 | ||
94767632 | 187 | static struct ip6_tnl __rcu ** |
c12b395a | 188 | ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p) |
1da177e4 | 189 | { |
b71d1d42 ED |
190 | const struct in6_addr *remote = &p->raddr; |
191 | const struct in6_addr *local = &p->laddr; | |
95c96174 | 192 | unsigned int h = 0; |
1da177e4 LT |
193 | int prio = 0; |
194 | ||
195 | if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { | |
196 | prio = 1; | |
ddbe5032 | 197 | h = HASH(remote, local); |
1da177e4 | 198 | } |
3e6c9fb5 | 199 | return &ip6n->tnls[prio][h]; |
1da177e4 LT |
200 | } |
201 | ||
202 | /** | |
3144581c | 203 | * ip6_tnl_link - add tunnel to hash table |
1da177e4 LT |
204 | * @t: tunnel to be added |
205 | **/ | |
206 | ||
207 | static void | |
2dd02c89 | 208 | ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 209 | { |
94767632 | 210 | struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms); |
1da177e4 | 211 | |
cf778b00 ED |
212 | rcu_assign_pointer(t->next , rtnl_dereference(*tp)); |
213 | rcu_assign_pointer(*tp, t); | |
1da177e4 LT |
214 | } |
215 | ||
216 | /** | |
3144581c | 217 | * ip6_tnl_unlink - remove tunnel from hash table |
1da177e4 LT |
218 | * @t: tunnel to be removed |
219 | **/ | |
220 | ||
221 | static void | |
2dd02c89 | 222 | ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
1da177e4 | 223 | { |
94767632 ED |
224 | struct ip6_tnl __rcu **tp; |
225 | struct ip6_tnl *iter; | |
226 | ||
227 | for (tp = ip6_tnl_bucket(ip6n, &t->parms); | |
228 | (iter = rtnl_dereference(*tp)) != NULL; | |
229 | tp = &iter->next) { | |
230 | if (t == iter) { | |
cf778b00 | 231 | rcu_assign_pointer(*tp, t->next); |
1da177e4 LT |
232 | break; |
233 | } | |
234 | } | |
235 | } | |
236 | ||
8560f226 ED |
237 | static void ip6_dev_free(struct net_device *dev) |
238 | { | |
cdf3464e MKL |
239 | struct ip6_tnl *t = netdev_priv(dev); |
240 | ||
607f725f | 241 | dst_cache_destroy(&t->dst_cache); |
8560f226 ED |
242 | free_percpu(dev->tstats); |
243 | free_netdev(dev); | |
244 | } | |
245 | ||
0b112457 ND |
246 | static int ip6_tnl_create2(struct net_device *dev) |
247 | { | |
248 | struct ip6_tnl *t = netdev_priv(dev); | |
249 | struct net *net = dev_net(dev); | |
250 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
251 | int err; | |
252 | ||
253 | t = netdev_priv(dev); | |
0b112457 ND |
254 | |
255 | err = register_netdevice(dev); | |
256 | if (err < 0) | |
257 | goto out; | |
258 | ||
259 | strcpy(t->parms.name, dev->name); | |
260 | dev->rtnl_link_ops = &ip6_link_ops; | |
261 | ||
262 | dev_hold(dev); | |
263 | ip6_tnl_link(ip6n, t); | |
264 | return 0; | |
265 | ||
266 | out: | |
267 | return err; | |
268 | } | |
269 | ||
1da177e4 | 270 | /** |
2c53040f | 271 | * ip6_tnl_create - create a new tunnel |
1da177e4 LT |
272 | * @p: tunnel parameters |
273 | * @pt: pointer to new tunnel | |
274 | * | |
275 | * Description: | |
276 | * Create tunnel matching given parameters. | |
1ab1457c YH |
277 | * |
278 | * Return: | |
37355565 | 279 | * created tunnel or error pointer |
1da177e4 LT |
280 | **/ |
281 | ||
c12b395a | 282 | static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p) |
1da177e4 LT |
283 | { |
284 | struct net_device *dev; | |
285 | struct ip6_tnl *t; | |
286 | char name[IFNAMSIZ]; | |
37355565 | 287 | int err = -ENOMEM; |
1da177e4 | 288 | |
34cc7ba6 | 289 | if (p->name[0]) |
1da177e4 | 290 | strlcpy(name, p->name, IFNAMSIZ); |
34cc7ba6 PE |
291 | else |
292 | sprintf(name, "ip6tnl%%d"); | |
293 | ||
c835a677 TG |
294 | dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, |
295 | ip6_tnl_dev_setup); | |
63159f29 | 296 | if (!dev) |
567131a7 | 297 | goto failed; |
1da177e4 | 298 | |
554eb277 PE |
299 | dev_net_set(dev, net); |
300 | ||
2941a486 | 301 | t = netdev_priv(dev); |
1da177e4 | 302 | t->parms = *p; |
0bd87628 | 303 | t->net = dev_net(dev); |
0b112457 | 304 | err = ip6_tnl_create2(dev); |
8560f226 ED |
305 | if (err < 0) |
306 | goto failed_free; | |
1da177e4 | 307 | |
567131a7 | 308 | return t; |
b37d428b PE |
309 | |
310 | failed_free: | |
8560f226 | 311 | ip6_dev_free(dev); |
567131a7 | 312 | failed: |
37355565 | 313 | return ERR_PTR(err); |
1da177e4 LT |
314 | } |
315 | ||
316 | /** | |
3144581c | 317 | * ip6_tnl_locate - find or create tunnel matching given parameters |
1ab1457c | 318 | * @p: tunnel parameters |
1da177e4 LT |
319 | * @create: != 0 if allowed to create new tunnel if no match found |
320 | * | |
321 | * Description: | |
3144581c | 322 | * ip6_tnl_locate() first tries to locate an existing tunnel |
1da177e4 LT |
323 | * based on @parms. If this is unsuccessful, but @create is set a new |
324 | * tunnel device is created and registered for use. | |
325 | * | |
326 | * Return: | |
37355565 | 327 | * matching tunnel or error pointer |
1da177e4 LT |
328 | **/ |
329 | ||
2dd02c89 | 330 | static struct ip6_tnl *ip6_tnl_locate(struct net *net, |
c12b395a | 331 | struct __ip6_tnl_parm *p, int create) |
1da177e4 | 332 | { |
b71d1d42 ED |
333 | const struct in6_addr *remote = &p->raddr; |
334 | const struct in6_addr *local = &p->laddr; | |
94767632 | 335 | struct ip6_tnl __rcu **tp; |
1da177e4 | 336 | struct ip6_tnl *t; |
2dd02c89 | 337 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 338 | |
94767632 ED |
339 | for (tp = ip6_tnl_bucket(ip6n, p); |
340 | (t = rtnl_dereference(*tp)) != NULL; | |
341 | tp = &t->next) { | |
1da177e4 | 342 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
2b0bb01b SK |
343 | ipv6_addr_equal(remote, &t->parms.raddr)) { |
344 | if (create) | |
37355565 | 345 | return ERR_PTR(-EEXIST); |
2b0bb01b | 346 | |
567131a7 | 347 | return t; |
2b0bb01b | 348 | } |
1da177e4 LT |
349 | } |
350 | if (!create) | |
37355565 | 351 | return ERR_PTR(-ENODEV); |
2dd02c89 | 352 | return ip6_tnl_create(net, p); |
1da177e4 LT |
353 | } |
354 | ||
355 | /** | |
3144581c | 356 | * ip6_tnl_dev_uninit - tunnel device uninitializer |
1da177e4 | 357 | * @dev: the device to be destroyed |
1ab1457c | 358 | * |
1da177e4 | 359 | * Description: |
3144581c | 360 | * ip6_tnl_dev_uninit() removes tunnel from its list |
1da177e4 LT |
361 | **/ |
362 | ||
363 | static void | |
3144581c | 364 | ip6_tnl_dev_uninit(struct net_device *dev) |
1da177e4 | 365 | { |
2941a486 | 366 | struct ip6_tnl *t = netdev_priv(dev); |
0bd87628 | 367 | struct net *net = t->net; |
2dd02c89 | 368 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 369 | |
94767632 | 370 | if (dev == ip6n->fb_tnl_dev) |
a9b3cd7f | 371 | RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL); |
94767632 | 372 | else |
2dd02c89 | 373 | ip6_tnl_unlink(ip6n, t); |
607f725f | 374 | dst_cache_reset(&t->dst_cache); |
1da177e4 LT |
375 | dev_put(dev); |
376 | } | |
377 | ||
378 | /** | |
379 | * parse_tvl_tnl_enc_lim - handle encapsulation limit option | |
380 | * @skb: received socket buffer | |
381 | * | |
1ab1457c YH |
382 | * Return: |
383 | * 0 if none was found, | |
1da177e4 LT |
384 | * else index to encapsulation limit |
385 | **/ | |
386 | ||
c12b395a | 387 | __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw) |
1da177e4 | 388 | { |
b71d1d42 | 389 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw; |
1da177e4 | 390 | __u8 nexthdr = ipv6h->nexthdr; |
67ba4152 | 391 | __u16 off = sizeof(*ipv6h); |
1da177e4 LT |
392 | |
393 | while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { | |
394 | __u16 optlen = 0; | |
395 | struct ipv6_opt_hdr *hdr; | |
67ba4152 | 396 | if (raw + off + sizeof(*hdr) > skb->data && |
1da177e4 LT |
397 | !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr))) |
398 | break; | |
399 | ||
400 | hdr = (struct ipv6_opt_hdr *) (raw + off); | |
401 | if (nexthdr == NEXTHDR_FRAGMENT) { | |
402 | struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; | |
403 | if (frag_hdr->frag_off) | |
404 | break; | |
405 | optlen = 8; | |
406 | } else if (nexthdr == NEXTHDR_AUTH) { | |
407 | optlen = (hdr->hdrlen + 2) << 2; | |
408 | } else { | |
409 | optlen = ipv6_optlen(hdr); | |
410 | } | |
411 | if (nexthdr == NEXTHDR_DEST) { | |
412 | __u16 i = off + 2; | |
413 | while (1) { | |
414 | struct ipv6_tlv_tnl_enc_lim *tel; | |
415 | ||
416 | /* No more room for encapsulation limit */ | |
417 | if (i + sizeof (*tel) > off + optlen) | |
418 | break; | |
419 | ||
420 | tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i]; | |
421 | /* return index of option if found and valid */ | |
422 | if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && | |
423 | tel->length == 1) | |
424 | return i; | |
425 | /* else jump to next option */ | |
426 | if (tel->type) | |
427 | i += tel->length + 2; | |
428 | else | |
429 | i++; | |
430 | } | |
431 | } | |
432 | nexthdr = hdr->nexthdr; | |
433 | off += optlen; | |
434 | } | |
435 | return 0; | |
436 | } | |
c12b395a | 437 | EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim); |
1da177e4 LT |
438 | |
439 | /** | |
e490d1d8 | 440 | * ip6_tnl_err - tunnel error handler |
1da177e4 LT |
441 | * |
442 | * Description: | |
e490d1d8 | 443 | * ip6_tnl_err() should handle errors in the tunnel according |
1da177e4 LT |
444 | * to the specifications in RFC 2473. |
445 | **/ | |
446 | ||
d2acc347 | 447 | static int |
502b0935 | 448 | ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, |
d5fdd6ba | 449 | u8 *type, u8 *code, int *msg, __u32 *info, int offset) |
1da177e4 | 450 | { |
b71d1d42 | 451 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data; |
1da177e4 LT |
452 | struct ip6_tnl *t; |
453 | int rel_msg = 0; | |
d5fdd6ba BH |
454 | u8 rel_type = ICMPV6_DEST_UNREACH; |
455 | u8 rel_code = ICMPV6_ADDR_UNREACH; | |
acf722f7 | 456 | u8 tproto; |
1da177e4 LT |
457 | __u32 rel_info = 0; |
458 | __u16 len; | |
d2acc347 | 459 | int err = -ENOENT; |
1da177e4 | 460 | |
1ab1457c YH |
461 | /* If the packet doesn't contain the original IPv6 header we are |
462 | in trouble since we might need the source address for further | |
1da177e4 LT |
463 | processing of the error. */ |
464 | ||
2922bc8a | 465 | rcu_read_lock(); |
e5d08d71 | 466 | t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, &ipv6h->saddr); |
63159f29 | 467 | if (!t) |
1da177e4 LT |
468 | goto out; |
469 | ||
acf722f7 AA |
470 | tproto = ACCESS_ONCE(t->parms.proto); |
471 | if (tproto != ipproto && tproto != 0) | |
502b0935 YK |
472 | goto out; |
473 | ||
d2acc347 HX |
474 | err = 0; |
475 | ||
e490d1d8 | 476 | switch (*type) { |
1da177e4 LT |
477 | __u32 teli; |
478 | struct ipv6_tlv_tnl_enc_lim *tel; | |
479 | __u32 mtu; | |
480 | case ICMPV6_DEST_UNREACH: | |
17a10c92 MB |
481 | net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n", |
482 | t->parms.name); | |
1da177e4 LT |
483 | rel_msg = 1; |
484 | break; | |
485 | case ICMPV6_TIME_EXCEED: | |
e490d1d8 | 486 | if ((*code) == ICMPV6_EXC_HOPLIMIT) { |
17a10c92 MB |
487 | net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", |
488 | t->parms.name); | |
1da177e4 LT |
489 | rel_msg = 1; |
490 | } | |
491 | break; | |
492 | case ICMPV6_PARAMPROB: | |
107a5fe6 | 493 | teli = 0; |
e490d1d8 | 494 | if ((*code) == ICMPV6_HDR_FIELD) |
c12b395a | 495 | teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); |
1da177e4 | 496 | |
704eae1f | 497 | if (teli && teli == *info - 2) { |
1da177e4 LT |
498 | tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; |
499 | if (tel->encap_limit == 0) { | |
17a10c92 MB |
500 | net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", |
501 | t->parms.name); | |
1da177e4 LT |
502 | rel_msg = 1; |
503 | } | |
e87cc472 | 504 | } else { |
17a10c92 MB |
505 | net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n", |
506 | t->parms.name); | |
1da177e4 LT |
507 | } |
508 | break; | |
509 | case ICMPV6_PKT_TOOBIG: | |
704eae1f | 510 | mtu = *info - offset; |
1da177e4 LT |
511 | if (mtu < IPV6_MIN_MTU) |
512 | mtu = IPV6_MIN_MTU; | |
513 | t->dev->mtu = mtu; | |
514 | ||
e5d08d71 IM |
515 | len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len); |
516 | if (len > mtu) { | |
1da177e4 LT |
517 | rel_type = ICMPV6_PKT_TOOBIG; |
518 | rel_code = 0; | |
519 | rel_info = mtu; | |
520 | rel_msg = 1; | |
521 | } | |
522 | break; | |
523 | } | |
e490d1d8 YK |
524 | |
525 | *type = rel_type; | |
526 | *code = rel_code; | |
527 | *info = rel_info; | |
528 | *msg = rel_msg; | |
529 | ||
530 | out: | |
2922bc8a | 531 | rcu_read_unlock(); |
e490d1d8 YK |
532 | return err; |
533 | } | |
534 | ||
c4d3efaf YK |
535 | static int |
536 | ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 537 | u8 type, u8 code, int offset, __be32 info) |
c4d3efaf YK |
538 | { |
539 | int rel_msg = 0; | |
d5fdd6ba BH |
540 | u8 rel_type = type; |
541 | u8 rel_code = code; | |
704eae1f | 542 | __u32 rel_info = ntohl(info); |
c4d3efaf YK |
543 | int err; |
544 | struct sk_buff *skb2; | |
b71d1d42 | 545 | const struct iphdr *eiph; |
c4d3efaf | 546 | struct rtable *rt; |
31e4543d | 547 | struct flowi4 fl4; |
c4d3efaf | 548 | |
502b0935 YK |
549 | err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, |
550 | &rel_msg, &rel_info, offset); | |
c4d3efaf YK |
551 | if (err < 0) |
552 | return err; | |
553 | ||
554 | if (rel_msg == 0) | |
555 | return 0; | |
556 | ||
557 | switch (rel_type) { | |
558 | case ICMPV6_DEST_UNREACH: | |
559 | if (rel_code != ICMPV6_ADDR_UNREACH) | |
560 | return 0; | |
561 | rel_type = ICMP_DEST_UNREACH; | |
562 | rel_code = ICMP_HOST_UNREACH; | |
563 | break; | |
564 | case ICMPV6_PKT_TOOBIG: | |
565 | if (rel_code != 0) | |
566 | return 0; | |
567 | rel_type = ICMP_DEST_UNREACH; | |
568 | rel_code = ICMP_FRAG_NEEDED; | |
569 | break; | |
ec18d9a2 DM |
570 | case NDISC_REDIRECT: |
571 | rel_type = ICMP_REDIRECT; | |
572 | rel_code = ICMP_REDIR_HOST; | |
c4d3efaf YK |
573 | default: |
574 | return 0; | |
575 | } | |
576 | ||
577 | if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) | |
578 | return 0; | |
579 | ||
580 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
581 | if (!skb2) | |
582 | return 0; | |
583 | ||
adf30907 ED |
584 | skb_dst_drop(skb2); |
585 | ||
c4d3efaf | 586 | skb_pull(skb2, offset); |
c1d2bbe1 | 587 | skb_reset_network_header(skb2); |
eddc9ec5 | 588 | eiph = ip_hdr(skb2); |
c4d3efaf YK |
589 | |
590 | /* Try to guess incoming interface */ | |
31e4543d | 591 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, |
78fbfd8a DM |
592 | eiph->saddr, 0, |
593 | 0, 0, | |
594 | IPPROTO_IPIP, RT_TOS(eiph->tos), 0); | |
b23dd4fe | 595 | if (IS_ERR(rt)) |
c4d3efaf YK |
596 | goto out; |
597 | ||
d8d1f30b | 598 | skb2->dev = rt->dst.dev; |
c4d3efaf YK |
599 | |
600 | /* route "incoming" packet */ | |
601 | if (rt->rt_flags & RTCF_LOCAL) { | |
602 | ip_rt_put(rt); | |
603 | rt = NULL; | |
31e4543d | 604 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, |
78fbfd8a DM |
605 | eiph->daddr, eiph->saddr, |
606 | 0, 0, | |
607 | IPPROTO_IPIP, | |
608 | RT_TOS(eiph->tos), 0); | |
b23dd4fe | 609 | if (IS_ERR(rt) || |
d8d1f30b | 610 | rt->dst.dev->type != ARPHRD_TUNNEL) { |
b23dd4fe DM |
611 | if (!IS_ERR(rt)) |
612 | ip_rt_put(rt); | |
c4d3efaf YK |
613 | goto out; |
614 | } | |
b23dd4fe | 615 | skb_dst_set(skb2, &rt->dst); |
c4d3efaf YK |
616 | } else { |
617 | ip_rt_put(rt); | |
618 | if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, | |
619 | skb2->dev) || | |
adf30907 | 620 | skb_dst(skb2)->dev->type != ARPHRD_TUNNEL) |
c4d3efaf YK |
621 | goto out; |
622 | } | |
623 | ||
624 | /* change mtu on this route */ | |
625 | if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { | |
adf30907 | 626 | if (rel_info > dst_mtu(skb_dst(skb2))) |
c4d3efaf YK |
627 | goto out; |
628 | ||
6700c270 | 629 | skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2, rel_info); |
c4d3efaf | 630 | } |
1ed5c48f | 631 | if (rel_type == ICMP_REDIRECT) |
6700c270 | 632 | skb_dst(skb2)->ops->redirect(skb_dst(skb2), NULL, skb2); |
c4d3efaf | 633 | |
704eae1f | 634 | icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); |
c4d3efaf YK |
635 | |
636 | out: | |
637 | kfree_skb(skb2); | |
638 | return 0; | |
639 | } | |
640 | ||
e490d1d8 YK |
641 | static int |
642 | ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 643 | u8 type, u8 code, int offset, __be32 info) |
e490d1d8 YK |
644 | { |
645 | int rel_msg = 0; | |
d5fdd6ba BH |
646 | u8 rel_type = type; |
647 | u8 rel_code = code; | |
704eae1f | 648 | __u32 rel_info = ntohl(info); |
e490d1d8 YK |
649 | int err; |
650 | ||
502b0935 YK |
651 | err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, |
652 | &rel_msg, &rel_info, offset); | |
e490d1d8 YK |
653 | if (err < 0) |
654 | return err; | |
655 | ||
656 | if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { | |
1da177e4 LT |
657 | struct rt6_info *rt; |
658 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
305d4b3c | 659 | |
1da177e4 | 660 | if (!skb2) |
e490d1d8 | 661 | return 0; |
1da177e4 | 662 | |
adf30907 | 663 | skb_dst_drop(skb2); |
1da177e4 | 664 | skb_pull(skb2, offset); |
c1d2bbe1 | 665 | skb_reset_network_header(skb2); |
1da177e4 LT |
666 | |
667 | /* Try to guess incoming interface */ | |
2f7f54b7 PE |
668 | rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, |
669 | NULL, 0, 0); | |
1da177e4 | 670 | |
d1918542 DM |
671 | if (rt && rt->dst.dev) |
672 | skb2->dev = rt->dst.dev; | |
1da177e4 | 673 | |
3ffe533c | 674 | icmpv6_send(skb2, rel_type, rel_code, rel_info); |
1da177e4 | 675 | |
94e187c0 | 676 | ip6_rt_put(rt); |
1da177e4 LT |
677 | |
678 | kfree_skb(skb2); | |
679 | } | |
e490d1d8 YK |
680 | |
681 | return 0; | |
1da177e4 LT |
682 | } |
683 | ||
f4e0b4c5 ND |
684 | static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
685 | const struct ipv6hdr *ipv6h, | |
686 | struct sk_buff *skb) | |
c4d3efaf YK |
687 | { |
688 | __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; | |
689 | ||
690 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) | |
eddc9ec5 | 691 | ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); |
c4d3efaf | 692 | |
f4e0b4c5 | 693 | return IP6_ECN_decapsulate(ipv6h, skb); |
c4d3efaf YK |
694 | } |
695 | ||
f4e0b4c5 ND |
696 | static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
697 | const struct ipv6hdr *ipv6h, | |
698 | struct sk_buff *skb) | |
1da177e4 | 699 | { |
8359925b | 700 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) |
29bb43b4 | 701 | ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); |
1da177e4 | 702 | |
f4e0b4c5 | 703 | return IP6_ECN_decapsulate(ipv6h, skb); |
1da177e4 | 704 | } |
8359925b | 705 | |
c12b395a | 706 | __u32 ip6_tnl_get_cap(struct ip6_tnl *t, |
d0087b29 VN |
707 | const struct in6_addr *laddr, |
708 | const struct in6_addr *raddr) | |
709 | { | |
c12b395a | 710 | struct __ip6_tnl_parm *p = &t->parms; |
d0087b29 VN |
711 | int ltype = ipv6_addr_type(laddr); |
712 | int rtype = ipv6_addr_type(raddr); | |
713 | __u32 flags = 0; | |
714 | ||
715 | if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) { | |
716 | flags = IP6_TNL_F_CAP_PER_PACKET; | |
717 | } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
718 | rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
719 | !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && | |
720 | (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { | |
721 | if (ltype&IPV6_ADDR_UNICAST) | |
722 | flags |= IP6_TNL_F_CAP_XMIT; | |
723 | if (rtype&IPV6_ADDR_UNICAST) | |
724 | flags |= IP6_TNL_F_CAP_RCV; | |
725 | } | |
726 | return flags; | |
727 | } | |
c12b395a | 728 | EXPORT_SYMBOL(ip6_tnl_get_cap); |
d0087b29 | 729 | |
f1a28eab | 730 | /* called with rcu_read_lock() */ |
c12b395a | 731 | int ip6_tnl_rcv_ctl(struct ip6_tnl *t, |
d0087b29 VN |
732 | const struct in6_addr *laddr, |
733 | const struct in6_addr *raddr) | |
09c6bbf0 | 734 | { |
c12b395a | 735 | struct __ip6_tnl_parm *p = &t->parms; |
09c6bbf0 | 736 | int ret = 0; |
0bd87628 | 737 | struct net *net = t->net; |
09c6bbf0 | 738 | |
d0087b29 VN |
739 | if ((p->flags & IP6_TNL_F_CAP_RCV) || |
740 | ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && | |
741 | (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) { | |
1ab1457c | 742 | struct net_device *ldev = NULL; |
09c6bbf0 VN |
743 | |
744 | if (p->link) | |
f1a28eab | 745 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 746 | |
d0087b29 VN |
747 | if ((ipv6_addr_is_multicast(laddr) || |
748 | likely(ipv6_chk_addr(net, laddr, ldev, 0))) && | |
749 | likely(!ipv6_chk_addr(net, raddr, NULL, 0))) | |
09c6bbf0 | 750 | ret = 1; |
09c6bbf0 VN |
751 | } |
752 | return ret; | |
753 | } | |
c12b395a | 754 | EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl); |
1da177e4 LT |
755 | |
756 | /** | |
3144581c | 757 | * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally |
1da177e4 | 758 | * @skb: received socket buffer |
8359925b YK |
759 | * @protocol: ethernet protocol ID |
760 | * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN | |
1da177e4 LT |
761 | * |
762 | * Return: 0 | |
763 | **/ | |
764 | ||
8359925b | 765 | static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol, |
502b0935 | 766 | __u8 ipproto, |
f4e0b4c5 ND |
767 | int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, |
768 | const struct ipv6hdr *ipv6h, | |
769 | struct sk_buff *skb)) | |
1da177e4 | 770 | { |
1da177e4 | 771 | struct ip6_tnl *t; |
b71d1d42 | 772 | const struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
acf722f7 | 773 | u8 tproto; |
f4e0b4c5 | 774 | int err; |
1da177e4 | 775 | |
2922bc8a | 776 | rcu_read_lock(); |
e5d08d71 | 777 | t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr); |
53b24b8f | 778 | if (t) { |
8f84985f | 779 | struct pcpu_sw_netstats *tstats; |
8560f226 | 780 | |
acf722f7 AA |
781 | tproto = ACCESS_ONCE(t->parms.proto); |
782 | if (tproto != ipproto && tproto != 0) { | |
2922bc8a | 783 | rcu_read_unlock(); |
502b0935 YK |
784 | goto discard; |
785 | } | |
786 | ||
1da177e4 | 787 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
2922bc8a | 788 | rcu_read_unlock(); |
50fba2aa | 789 | goto discard; |
1da177e4 LT |
790 | } |
791 | ||
d0087b29 | 792 | if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) { |
3dca02af | 793 | t->dev->stats.rx_dropped++; |
2922bc8a | 794 | rcu_read_unlock(); |
1da177e4 LT |
795 | goto discard; |
796 | } | |
b0e380b1 | 797 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 798 | skb_reset_network_header(skb); |
8359925b | 799 | skb->protocol = htons(protocol); |
1da177e4 | 800 | memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); |
8359925b | 801 | |
ea23192e | 802 | __skb_tunnel_rx(skb, t->dev, t->net); |
f4e0b4c5 ND |
803 | |
804 | err = dscp_ecn_decapsulate(t, ipv6h, skb); | |
805 | if (unlikely(err)) { | |
806 | if (log_ecn_error) | |
807 | net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n", | |
808 | &ipv6h->saddr, | |
809 | ipv6_get_dsfield(ipv6h)); | |
810 | if (err > 1) { | |
811 | ++t->dev->stats.rx_frame_errors; | |
812 | ++t->dev->stats.rx_errors; | |
813 | rcu_read_unlock(); | |
814 | goto discard; | |
815 | } | |
816 | } | |
817 | ||
8560f226 | 818 | tstats = this_cpu_ptr(t->dev->tstats); |
abb6013c | 819 | u64_stats_update_begin(&tstats->syncp); |
8560f226 ED |
820 | tstats->rx_packets++; |
821 | tstats->rx_bytes += skb->len; | |
abb6013c | 822 | u64_stats_update_end(&tstats->syncp); |
8560f226 | 823 | |
caf586e5 | 824 | netif_rx(skb); |
8990f468 | 825 | |
2922bc8a | 826 | rcu_read_unlock(); |
1da177e4 LT |
827 | return 0; |
828 | } | |
2922bc8a | 829 | rcu_read_unlock(); |
1da177e4 | 830 | return 1; |
50fba2aa HX |
831 | |
832 | discard: | |
833 | kfree_skb(skb); | |
834 | return 0; | |
1da177e4 LT |
835 | } |
836 | ||
c4d3efaf YK |
837 | static int ip4ip6_rcv(struct sk_buff *skb) |
838 | { | |
502b0935 YK |
839 | return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP, |
840 | ip4ip6_dscp_ecn_decapsulate); | |
c4d3efaf YK |
841 | } |
842 | ||
8359925b YK |
843 | static int ip6ip6_rcv(struct sk_buff *skb) |
844 | { | |
502b0935 YK |
845 | return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6, |
846 | ip6ip6_dscp_ecn_decapsulate); | |
8359925b YK |
847 | } |
848 | ||
6fb32dde VN |
849 | struct ipv6_tel_txoption { |
850 | struct ipv6_txoptions ops; | |
851 | __u8 dst_opt[8]; | |
852 | }; | |
1da177e4 | 853 | |
6fb32dde VN |
854 | static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) |
855 | { | |
856 | memset(opt, 0, sizeof(struct ipv6_tel_txoption)); | |
1da177e4 | 857 | |
6fb32dde VN |
858 | opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; |
859 | opt->dst_opt[3] = 1; | |
860 | opt->dst_opt[4] = encap_limit; | |
861 | opt->dst_opt[5] = IPV6_TLV_PADN; | |
862 | opt->dst_opt[6] = 1; | |
1da177e4 | 863 | |
6fb32dde VN |
864 | opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; |
865 | opt->ops.opt_nflen = 8; | |
1da177e4 LT |
866 | } |
867 | ||
868 | /** | |
3144581c | 869 | * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own |
1da177e4 | 870 | * @t: the outgoing tunnel device |
1ab1457c | 871 | * @hdr: IPv6 header from the incoming packet |
1da177e4 LT |
872 | * |
873 | * Description: | |
1ab1457c | 874 | * Avoid trivial tunneling loop by checking that tunnel exit-point |
1da177e4 LT |
875 | * doesn't match source of incoming packet. |
876 | * | |
1ab1457c | 877 | * Return: |
1da177e4 LT |
878 | * 1 if conflict, |
879 | * 0 else | |
880 | **/ | |
881 | ||
92113bfd | 882 | static inline bool |
b71d1d42 | 883 | ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) |
1da177e4 LT |
884 | { |
885 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
886 | } | |
887 | ||
d5005140 SK |
888 | int ip6_tnl_xmit_ctl(struct ip6_tnl *t, |
889 | const struct in6_addr *laddr, | |
890 | const struct in6_addr *raddr) | |
09c6bbf0 | 891 | { |
c12b395a | 892 | struct __ip6_tnl_parm *p = &t->parms; |
09c6bbf0 | 893 | int ret = 0; |
0bd87628 | 894 | struct net *net = t->net; |
09c6bbf0 | 895 | |
d5005140 SK |
896 | if ((p->flags & IP6_TNL_F_CAP_XMIT) || |
897 | ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && | |
898 | (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) { | |
09c6bbf0 VN |
899 | struct net_device *ldev = NULL; |
900 | ||
f1a28eab | 901 | rcu_read_lock(); |
09c6bbf0 | 902 | if (p->link) |
f1a28eab | 903 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 904 | |
d5005140 | 905 | if (unlikely(!ipv6_chk_addr(net, laddr, ldev, 0))) |
f3213831 JP |
906 | pr_warn("%s xmit: Local address not yet configured!\n", |
907 | p->name); | |
d5005140 SK |
908 | else if (!ipv6_addr_is_multicast(raddr) && |
909 | unlikely(ipv6_chk_addr(net, raddr, NULL, 0))) | |
f3213831 JP |
910 | pr_warn("%s xmit: Routing loop! Remote address found on this node!\n", |
911 | p->name); | |
09c6bbf0 VN |
912 | else |
913 | ret = 1; | |
f1a28eab | 914 | rcu_read_unlock(); |
09c6bbf0 VN |
915 | } |
916 | return ret; | |
917 | } | |
c12b395a | 918 | EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl); |
919 | ||
1da177e4 | 920 | /** |
61ec2aec | 921 | * ip6_tnl_xmit2 - encapsulate packet and send |
1da177e4 | 922 | * @skb: the outgoing socket buffer |
1ab1457c | 923 | * @dev: the outgoing tunnel device |
61ec2aec YK |
924 | * @dsfield: dscp code for outer header |
925 | * @fl: flow of tunneled packet | |
926 | * @encap_limit: encapsulation limit | |
927 | * @pmtu: Path MTU is stored if packet is too big | |
1da177e4 LT |
928 | * |
929 | * Description: | |
930 | * Build new header and do some sanity checks on the packet before sending | |
931 | * it. | |
932 | * | |
1ab1457c | 933 | * Return: |
c4d3efaf | 934 | * 0 on success |
61ec2aec YK |
935 | * -1 fail |
936 | * %-EMSGSIZE message too big. return mtu in this case. | |
1da177e4 LT |
937 | **/ |
938 | ||
61ec2aec YK |
939 | static int ip6_tnl_xmit2(struct sk_buff *skb, |
940 | struct net_device *dev, | |
941 | __u8 dsfield, | |
4c9483b2 | 942 | struct flowi6 *fl6, |
61ec2aec YK |
943 | int encap_limit, |
944 | __u32 *pmtu) | |
1da177e4 | 945 | { |
2941a486 | 946 | struct ip6_tnl *t = netdev_priv(dev); |
0bd87628 | 947 | struct net *net = t->net; |
3dca02af | 948 | struct net_device_stats *stats = &t->dev->stats; |
0660e03f | 949 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
6fb32dde | 950 | struct ipv6_tel_txoption opt; |
d24f22f3 | 951 | struct dst_entry *dst = NULL, *ndst = NULL; |
1da177e4 LT |
952 | struct net_device *tdev; |
953 | int mtu; | |
c2636b4d | 954 | unsigned int max_headroom = sizeof(struct ipv6hdr); |
1da177e4 | 955 | u8 proto; |
61ec2aec | 956 | int err = -1; |
1da177e4 | 957 | |
ea3dc960 SK |
958 | /* NBMA tunnel */ |
959 | if (ipv6_addr_any(&t->parms.raddr)) { | |
960 | struct in6_addr *addr6; | |
961 | struct neighbour *neigh; | |
962 | int addr_type; | |
963 | ||
964 | if (!skb_dst(skb)) | |
965 | goto tx_err_link_failure; | |
966 | ||
967 | neigh = dst_neigh_lookup(skb_dst(skb), | |
968 | &ipv6_hdr(skb)->daddr); | |
969 | if (!neigh) | |
970 | goto tx_err_link_failure; | |
971 | ||
972 | addr6 = (struct in6_addr *)&neigh->primary_key; | |
973 | addr_type = ipv6_addr_type(addr6); | |
974 | ||
975 | if (addr_type == IPV6_ADDR_ANY) | |
976 | addr6 = &ipv6_hdr(skb)->daddr; | |
977 | ||
978 | memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr)); | |
979 | neigh_release(neigh); | |
980 | } else if (!fl6->flowi6_mark) | |
607f725f | 981 | dst = dst_cache_get(&t->dst_cache); |
d5005140 SK |
982 | |
983 | if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr)) | |
984 | goto tx_err_link_failure; | |
985 | ||
89b02126 | 986 | if (!dst) { |
cdf3464e | 987 | dst = ip6_route_output(net, NULL, fl6); |
1da177e4 | 988 | |
cdf3464e | 989 | if (dst->error) |
a57ebc90 | 990 | goto tx_err_link_failure; |
cdf3464e MKL |
991 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0); |
992 | if (IS_ERR(dst)) { | |
993 | err = PTR_ERR(dst); | |
994 | dst = NULL; | |
452edd59 DM |
995 | goto tx_err_link_failure; |
996 | } | |
cdf3464e | 997 | ndst = dst; |
a57ebc90 | 998 | } |
1da177e4 LT |
999 | |
1000 | tdev = dst->dev; | |
1001 | ||
1002 | if (tdev == dev) { | |
1003 | stats->collisions++; | |
e87cc472 JP |
1004 | net_warn_ratelimited("%s: Local routing loop detected!\n", |
1005 | t->parms.name); | |
1da177e4 LT |
1006 | goto tx_err_dst_release; |
1007 | } | |
67ba4152 | 1008 | mtu = dst_mtu(dst) - sizeof(*ipv6h); |
6fb32dde | 1009 | if (encap_limit >= 0) { |
1da177e4 LT |
1010 | max_headroom += 8; |
1011 | mtu -= 8; | |
1012 | } | |
1013 | if (mtu < IPV6_MIN_MTU) | |
1014 | mtu = IPV6_MIN_MTU; | |
adf30907 | 1015 | if (skb_dst(skb)) |
6700c270 | 1016 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); |
1da177e4 | 1017 | if (skb->len > mtu) { |
61ec2aec YK |
1018 | *pmtu = mtu; |
1019 | err = -EMSGSIZE; | |
1da177e4 LT |
1020 | goto tx_err_dst_release; |
1021 | } | |
1022 | ||
963a88b3 | 1023 | skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev))); |
0bd87628 | 1024 | |
1da177e4 LT |
1025 | /* |
1026 | * Okay, now see if we can stuff it in the buffer as-is. | |
1027 | */ | |
1028 | max_headroom += LL_RESERVED_SPACE(tdev); | |
1ab1457c | 1029 | |
cfbba49d PM |
1030 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
1031 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 | 1032 | struct sk_buff *new_skb; |
1ab1457c | 1033 | |
e5d08d71 IM |
1034 | new_skb = skb_realloc_headroom(skb, max_headroom); |
1035 | if (!new_skb) | |
1da177e4 LT |
1036 | goto tx_err_dst_release; |
1037 | ||
1038 | if (skb->sk) | |
1039 | skb_set_owner_w(new_skb, skb->sk); | |
9ff26449 | 1040 | consume_skb(skb); |
1da177e4 LT |
1041 | skb = new_skb; |
1042 | } | |
cdf3464e MKL |
1043 | |
1044 | if (!fl6->flowi6_mark && ndst) | |
607f725f | 1045 | dst_cache_set_ip6(&t->dst_cache, ndst, &fl6->saddr); |
cdf3464e MKL |
1046 | skb_dst_set(skb, dst); |
1047 | ||
b0e380b1 | 1048 | skb->transport_header = skb->network_header; |
1da177e4 | 1049 | |
4c9483b2 | 1050 | proto = fl6->flowi6_proto; |
6fb32dde VN |
1051 | if (encap_limit >= 0) { |
1052 | init_tel_txopt(&opt, encap_limit); | |
1053 | ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); | |
1054 | } | |
3d483058 HFS |
1055 | |
1056 | if (likely(!skb->encapsulation)) { | |
1057 | skb_reset_inner_headers(skb); | |
1058 | skb->encapsulation = 1; | |
1059 | } | |
1060 | ||
e2d1bca7 ACM |
1061 | skb_push(skb, sizeof(struct ipv6hdr)); |
1062 | skb_reset_network_header(skb); | |
0660e03f | 1063 | ipv6h = ipv6_hdr(skb); |
cb1ce2ef | 1064 | ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), |
42240901 | 1065 | ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6)); |
1da177e4 LT |
1066 | ipv6h->hop_limit = t->parms.hop_limit; |
1067 | ipv6h->nexthdr = proto; | |
4e3fd7a0 AD |
1068 | ipv6h->saddr = fl6->saddr; |
1069 | ipv6h->daddr = fl6->daddr; | |
79b16aad | 1070 | ip6tunnel_xmit(NULL, skb, dev); |
1da177e4 LT |
1071 | return 0; |
1072 | tx_err_link_failure: | |
1073 | stats->tx_carrier_errors++; | |
1074 | dst_link_failure(skb); | |
1075 | tx_err_dst_release: | |
cdf3464e | 1076 | dst_release(dst); |
61ec2aec YK |
1077 | return err; |
1078 | } | |
1079 | ||
c4d3efaf YK |
1080 | static inline int |
1081 | ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1082 | { | |
1083 | struct ip6_tnl *t = netdev_priv(dev); | |
b71d1d42 | 1084 | const struct iphdr *iph = ip_hdr(skb); |
c4d3efaf | 1085 | int encap_limit = -1; |
4c9483b2 | 1086 | struct flowi6 fl6; |
c4d3efaf YK |
1087 | __u8 dsfield; |
1088 | __u32 mtu; | |
acf722f7 | 1089 | u8 tproto; |
c4d3efaf YK |
1090 | int err; |
1091 | ||
5146d1f1 BH |
1092 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
1093 | ||
acf722f7 | 1094 | tproto = ACCESS_ONCE(t->parms.proto); |
d5005140 | 1095 | if (tproto != IPPROTO_IPIP && tproto != 0) |
c4d3efaf YK |
1096 | return -1; |
1097 | ||
1098 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1099 | encap_limit = t->parms.encap_limit; | |
1100 | ||
67ba4152 | 1101 | memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); |
4c9483b2 | 1102 | fl6.flowi6_proto = IPPROTO_IPIP; |
c4d3efaf YK |
1103 | |
1104 | dsfield = ipv4_get_dsfield(iph); | |
1105 | ||
d24f22f3 | 1106 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
4c9483b2 | 1107 | fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) |
b77f2fa6 | 1108 | & IPV6_TCLASS_MASK; |
d24f22f3 ED |
1109 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
1110 | fl6.flowi6_mark = skb->mark; | |
c4d3efaf | 1111 | |
4c9483b2 | 1112 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); |
c4d3efaf YK |
1113 | if (err != 0) { |
1114 | /* XXX: send ICMP error even if DF is not set. */ | |
1115 | if (err == -EMSGSIZE) | |
1116 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
1117 | htonl(mtu)); | |
1118 | return -1; | |
1119 | } | |
1120 | ||
1121 | return 0; | |
1122 | } | |
1123 | ||
61ec2aec YK |
1124 | static inline int |
1125 | ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1126 | { | |
1127 | struct ip6_tnl *t = netdev_priv(dev); | |
0660e03f | 1128 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
61ec2aec YK |
1129 | int encap_limit = -1; |
1130 | __u16 offset; | |
4c9483b2 | 1131 | struct flowi6 fl6; |
61ec2aec YK |
1132 | __u8 dsfield; |
1133 | __u32 mtu; | |
acf722f7 | 1134 | u8 tproto; |
61ec2aec YK |
1135 | int err; |
1136 | ||
acf722f7 AA |
1137 | tproto = ACCESS_ONCE(t->parms.proto); |
1138 | if ((tproto != IPPROTO_IPV6 && tproto != 0) || | |
d5005140 | 1139 | ip6_tnl_addr_conflict(t, ipv6h)) |
61ec2aec YK |
1140 | return -1; |
1141 | ||
c12b395a | 1142 | offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); |
d56f90a7 | 1143 | if (offset > 0) { |
61ec2aec | 1144 | struct ipv6_tlv_tnl_enc_lim *tel; |
d56f90a7 | 1145 | tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; |
61ec2aec YK |
1146 | if (tel->encap_limit == 0) { |
1147 | icmpv6_send(skb, ICMPV6_PARAMPROB, | |
3ffe533c | 1148 | ICMPV6_HDR_FIELD, offset + 2); |
61ec2aec YK |
1149 | return -1; |
1150 | } | |
1151 | encap_limit = tel->encap_limit - 1; | |
1152 | } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1153 | encap_limit = t->parms.encap_limit; | |
1154 | ||
67ba4152 | 1155 | memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); |
4c9483b2 | 1156 | fl6.flowi6_proto = IPPROTO_IPV6; |
61ec2aec YK |
1157 | |
1158 | dsfield = ipv6_get_dsfield(ipv6h); | |
d24f22f3 | 1159 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
4c9483b2 | 1160 | fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); |
d24f22f3 | 1161 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) |
3308de2b | 1162 | fl6.flowlabel |= ip6_flowlabel(ipv6h); |
d24f22f3 ED |
1163 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
1164 | fl6.flowi6_mark = skb->mark; | |
61ec2aec | 1165 | |
4c9483b2 | 1166 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); |
61ec2aec YK |
1167 | if (err != 0) { |
1168 | if (err == -EMSGSIZE) | |
3ffe533c | 1169 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
61ec2aec YK |
1170 | return -1; |
1171 | } | |
1172 | ||
1173 | return 0; | |
1174 | } | |
1175 | ||
6fef4c0c | 1176 | static netdev_tx_t |
61ec2aec YK |
1177 | ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) |
1178 | { | |
1179 | struct ip6_tnl *t = netdev_priv(dev); | |
3dca02af | 1180 | struct net_device_stats *stats = &t->dev->stats; |
61ec2aec YK |
1181 | int ret; |
1182 | ||
61ec2aec | 1183 | switch (skb->protocol) { |
60678040 | 1184 | case htons(ETH_P_IP): |
c4d3efaf YK |
1185 | ret = ip4ip6_tnl_xmit(skb, dev); |
1186 | break; | |
60678040 | 1187 | case htons(ETH_P_IPV6): |
61ec2aec YK |
1188 | ret = ip6ip6_tnl_xmit(skb, dev); |
1189 | break; | |
1190 | default: | |
1191 | goto tx_err; | |
1192 | } | |
1193 | ||
1194 | if (ret < 0) | |
1195 | goto tx_err; | |
1196 | ||
6ed10654 | 1197 | return NETDEV_TX_OK; |
61ec2aec | 1198 | |
1da177e4 LT |
1199 | tx_err: |
1200 | stats->tx_errors++; | |
1201 | stats->tx_dropped++; | |
1202 | kfree_skb(skb); | |
6ed10654 | 1203 | return NETDEV_TX_OK; |
1da177e4 LT |
1204 | } |
1205 | ||
3144581c | 1206 | static void ip6_tnl_link_config(struct ip6_tnl *t) |
1da177e4 LT |
1207 | { |
1208 | struct net_device *dev = t->dev; | |
c12b395a | 1209 | struct __ip6_tnl_parm *p = &t->parms; |
4c9483b2 | 1210 | struct flowi6 *fl6 = &t->fl.u.ip6; |
1da177e4 | 1211 | |
3a6d54c5 JP |
1212 | memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); |
1213 | memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
1da177e4 LT |
1214 | |
1215 | /* Set up flowi template */ | |
4e3fd7a0 AD |
1216 | fl6->saddr = p->laddr; |
1217 | fl6->daddr = p->raddr; | |
4c9483b2 DM |
1218 | fl6->flowi6_oif = p->link; |
1219 | fl6->flowlabel = 0; | |
1da177e4 LT |
1220 | |
1221 | if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) | |
4c9483b2 | 1222 | fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; |
1da177e4 | 1223 | if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) |
4c9483b2 | 1224 | fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; |
1da177e4 | 1225 | |
d0087b29 VN |
1226 | p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); |
1227 | p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); | |
1da177e4 LT |
1228 | |
1229 | if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) | |
1230 | dev->flags |= IFF_POINTOPOINT; | |
1231 | else | |
1232 | dev->flags &= ~IFF_POINTOPOINT; | |
1233 | ||
1da177e4 | 1234 | if (p->flags & IP6_TNL_F_CAP_XMIT) { |
305d4b3c VN |
1235 | int strict = (ipv6_addr_type(&p->raddr) & |
1236 | (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); | |
1237 | ||
0bd87628 | 1238 | struct rt6_info *rt = rt6_lookup(t->net, |
2f7f54b7 | 1239 | &p->raddr, &p->laddr, |
305d4b3c | 1240 | p->link, strict); |
1da177e4 | 1241 | |
63159f29 | 1242 | if (!rt) |
1da177e4 LT |
1243 | return; |
1244 | ||
d1918542 DM |
1245 | if (rt->dst.dev) { |
1246 | dev->hard_header_len = rt->dst.dev->hard_header_len + | |
67ba4152 | 1247 | sizeof(struct ipv6hdr); |
1da177e4 | 1248 | |
67ba4152 | 1249 | dev->mtu = rt->dst.dev->mtu - sizeof(struct ipv6hdr); |
381601e5 | 1250 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
67ba4152 | 1251 | dev->mtu -= 8; |
1da177e4 LT |
1252 | |
1253 | if (dev->mtu < IPV6_MIN_MTU) | |
1254 | dev->mtu = IPV6_MIN_MTU; | |
1255 | } | |
94e187c0 | 1256 | ip6_rt_put(rt); |
1da177e4 LT |
1257 | } |
1258 | } | |
1259 | ||
1260 | /** | |
3144581c | 1261 | * ip6_tnl_change - update the tunnel parameters |
1da177e4 LT |
1262 | * @t: tunnel to be changed |
1263 | * @p: tunnel configuration parameters | |
1da177e4 LT |
1264 | * |
1265 | * Description: | |
3144581c | 1266 | * ip6_tnl_change() updates the tunnel parameters |
1da177e4 LT |
1267 | **/ |
1268 | ||
1269 | static int | |
c12b395a | 1270 | ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) |
1da177e4 | 1271 | { |
4e3fd7a0 AD |
1272 | t->parms.laddr = p->laddr; |
1273 | t->parms.raddr = p->raddr; | |
1da177e4 LT |
1274 | t->parms.flags = p->flags; |
1275 | t->parms.hop_limit = p->hop_limit; | |
1276 | t->parms.encap_limit = p->encap_limit; | |
1277 | t->parms.flowinfo = p->flowinfo; | |
8181b8c1 | 1278 | t->parms.link = p->link; |
502b0935 | 1279 | t->parms.proto = p->proto; |
607f725f | 1280 | dst_cache_reset(&t->dst_cache); |
3144581c | 1281 | ip6_tnl_link_config(t); |
1da177e4 LT |
1282 | return 0; |
1283 | } | |
1284 | ||
0b112457 ND |
1285 | static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) |
1286 | { | |
0bd87628 | 1287 | struct net *net = t->net; |
0b112457 ND |
1288 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1289 | int err; | |
1290 | ||
1291 | ip6_tnl_unlink(ip6n, t); | |
1292 | synchronize_net(); | |
1293 | err = ip6_tnl_change(t, p); | |
1294 | ip6_tnl_link(ip6n, t); | |
1295 | netdev_state_change(t->dev); | |
1296 | return err; | |
1297 | } | |
1298 | ||
acf722f7 AA |
1299 | static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) |
1300 | { | |
1301 | /* for default tnl0 device allow to change only the proto */ | |
1302 | t->parms.proto = p->proto; | |
1303 | netdev_state_change(t->dev); | |
1304 | return 0; | |
1305 | } | |
1306 | ||
c12b395a | 1307 | static void |
1308 | ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u) | |
1309 | { | |
1310 | p->laddr = u->laddr; | |
1311 | p->raddr = u->raddr; | |
1312 | p->flags = u->flags; | |
1313 | p->hop_limit = u->hop_limit; | |
1314 | p->encap_limit = u->encap_limit; | |
1315 | p->flowinfo = u->flowinfo; | |
1316 | p->link = u->link; | |
1317 | p->proto = u->proto; | |
1318 | memcpy(p->name, u->name, sizeof(u->name)); | |
1319 | } | |
1320 | ||
1321 | static void | |
1322 | ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p) | |
1323 | { | |
1324 | u->laddr = p->laddr; | |
1325 | u->raddr = p->raddr; | |
1326 | u->flags = p->flags; | |
1327 | u->hop_limit = p->hop_limit; | |
1328 | u->encap_limit = p->encap_limit; | |
1329 | u->flowinfo = p->flowinfo; | |
1330 | u->link = p->link; | |
1331 | u->proto = p->proto; | |
1332 | memcpy(u->name, p->name, sizeof(u->name)); | |
1333 | } | |
1334 | ||
1da177e4 | 1335 | /** |
3144581c | 1336 | * ip6_tnl_ioctl - configure ipv6 tunnels from userspace |
1da177e4 LT |
1337 | * @dev: virtual device associated with tunnel |
1338 | * @ifr: parameters passed from userspace | |
1339 | * @cmd: command to be performed | |
1340 | * | |
1341 | * Description: | |
3144581c | 1342 | * ip6_tnl_ioctl() is used for managing IPv6 tunnels |
1ab1457c | 1343 | * from userspace. |
1da177e4 LT |
1344 | * |
1345 | * The possible commands are the following: | |
1346 | * %SIOCGETTUNNEL: get tunnel parameters for device | |
1347 | * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters | |
1348 | * %SIOCCHGTUNNEL: change tunnel parameters to those given | |
1349 | * %SIOCDELTUNNEL: delete tunnel | |
1350 | * | |
1ab1457c | 1351 | * The fallback device "ip6tnl0", created during module |
1da177e4 LT |
1352 | * initialization, can be used for creating other tunnel devices. |
1353 | * | |
1354 | * Return: | |
1355 | * 0 on success, | |
1356 | * %-EFAULT if unable to copy data to or from userspace, | |
1357 | * %-EPERM if current process hasn't %CAP_NET_ADMIN set | |
1358 | * %-EINVAL if passed tunnel parameters are invalid, | |
1359 | * %-EEXIST if changing a tunnel's parameters would cause a conflict | |
1360 | * %-ENODEV if attempting to change or delete a nonexisting device | |
1361 | **/ | |
1362 | ||
1363 | static int | |
3144581c | 1364 | ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
1da177e4 LT |
1365 | { |
1366 | int err = 0; | |
1da177e4 | 1367 | struct ip6_tnl_parm p; |
c12b395a | 1368 | struct __ip6_tnl_parm p1; |
74462f0d ND |
1369 | struct ip6_tnl *t = netdev_priv(dev); |
1370 | struct net *net = t->net; | |
2dd02c89 | 1371 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 LT |
1372 | |
1373 | switch (cmd) { | |
1374 | case SIOCGETTUNNEL: | |
15820e12 | 1375 | if (dev == ip6n->fb_tnl_dev) { |
67ba4152 | 1376 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
1da177e4 LT |
1377 | err = -EFAULT; |
1378 | break; | |
1379 | } | |
c12b395a | 1380 | ip6_tnl_parm_from_user(&p1, &p); |
1381 | t = ip6_tnl_locate(net, &p1, 0); | |
37355565 | 1382 | if (IS_ERR(t)) |
74462f0d | 1383 | t = netdev_priv(dev); |
5ef5d6c5 DC |
1384 | } else { |
1385 | memset(&p, 0, sizeof(p)); | |
567131a7 | 1386 | } |
c12b395a | 1387 | ip6_tnl_parm_to_user(&p, &t->parms); |
67ba4152 | 1388 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) { |
1da177e4 LT |
1389 | err = -EFAULT; |
1390 | } | |
1391 | break; | |
1392 | case SIOCADDTUNNEL: | |
1393 | case SIOCCHGTUNNEL: | |
1394 | err = -EPERM; | |
af31f412 | 1395 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 1396 | break; |
567131a7 | 1397 | err = -EFAULT; |
67ba4152 | 1398 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
1da177e4 | 1399 | break; |
567131a7 | 1400 | err = -EINVAL; |
502b0935 YK |
1401 | if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && |
1402 | p.proto != 0) | |
1da177e4 | 1403 | break; |
c12b395a | 1404 | ip6_tnl_parm_from_user(&p1, &p); |
1405 | t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL); | |
acf722f7 | 1406 | if (cmd == SIOCCHGTUNNEL) { |
37355565 | 1407 | if (!IS_ERR(t)) { |
567131a7 VN |
1408 | if (t->dev != dev) { |
1409 | err = -EEXIST; | |
1410 | break; | |
1411 | } | |
1412 | } else | |
1413 | t = netdev_priv(dev); | |
acf722f7 AA |
1414 | if (dev == ip6n->fb_tnl_dev) |
1415 | err = ip6_tnl0_update(t, &p1); | |
1416 | else | |
1417 | err = ip6_tnl_update(t, &p1); | |
1da177e4 | 1418 | } |
37355565 | 1419 | if (!IS_ERR(t)) { |
1da177e4 | 1420 | err = 0; |
c12b395a | 1421 | ip6_tnl_parm_to_user(&p, &t->parms); |
1422 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
567131a7 VN |
1423 | err = -EFAULT; |
1424 | ||
37355565 ND |
1425 | } else { |
1426 | err = PTR_ERR(t); | |
1427 | } | |
1da177e4 LT |
1428 | break; |
1429 | case SIOCDELTUNNEL: | |
1430 | err = -EPERM; | |
af31f412 | 1431 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1432 | break; |
1433 | ||
15820e12 | 1434 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 | 1435 | err = -EFAULT; |
67ba4152 | 1436 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
1da177e4 | 1437 | break; |
567131a7 | 1438 | err = -ENOENT; |
c12b395a | 1439 | ip6_tnl_parm_from_user(&p1, &p); |
1440 | t = ip6_tnl_locate(net, &p1, 0); | |
37355565 | 1441 | if (IS_ERR(t)) |
1da177e4 | 1442 | break; |
567131a7 | 1443 | err = -EPERM; |
15820e12 | 1444 | if (t->dev == ip6n->fb_tnl_dev) |
1da177e4 | 1445 | break; |
567131a7 | 1446 | dev = t->dev; |
1da177e4 | 1447 | } |
22f8cde5 SH |
1448 | err = 0; |
1449 | unregister_netdevice(dev); | |
1da177e4 LT |
1450 | break; |
1451 | default: | |
1452 | err = -EINVAL; | |
1453 | } | |
1454 | return err; | |
1455 | } | |
1456 | ||
1da177e4 | 1457 | /** |
3144581c | 1458 | * ip6_tnl_change_mtu - change mtu manually for tunnel device |
1da177e4 LT |
1459 | * @dev: virtual device associated with tunnel |
1460 | * @new_mtu: the new mtu | |
1461 | * | |
1462 | * Return: | |
1463 | * 0 on success, | |
1464 | * %-EINVAL if mtu too small | |
1465 | **/ | |
1466 | ||
1467 | static int | |
3144581c | 1468 | ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) |
1da177e4 | 1469 | { |
582442d6 OG |
1470 | struct ip6_tnl *tnl = netdev_priv(dev); |
1471 | ||
1472 | if (tnl->parms.proto == IPPROTO_IPIP) { | |
1473 | if (new_mtu < 68) | |
1474 | return -EINVAL; | |
1475 | } else { | |
1476 | if (new_mtu < IPV6_MIN_MTU) | |
1477 | return -EINVAL; | |
1da177e4 | 1478 | } |
582442d6 OG |
1479 | if (new_mtu > 0xFFF8 - dev->hard_header_len) |
1480 | return -EINVAL; | |
1da177e4 LT |
1481 | dev->mtu = new_mtu; |
1482 | return 0; | |
1483 | } | |
1484 | ||
ecf2c06a ND |
1485 | int ip6_tnl_get_iflink(const struct net_device *dev) |
1486 | { | |
1487 | struct ip6_tnl *t = netdev_priv(dev); | |
1488 | ||
1489 | return t->parms.link; | |
1490 | } | |
1491 | EXPORT_SYMBOL(ip6_tnl_get_iflink); | |
1326c3d5 SH |
1492 | |
1493 | static const struct net_device_ops ip6_tnl_netdev_ops = { | |
6c6151da | 1494 | .ndo_init = ip6_tnl_dev_init, |
8560f226 | 1495 | .ndo_uninit = ip6_tnl_dev_uninit, |
1326c3d5 | 1496 | .ndo_start_xmit = ip6_tnl_xmit, |
8560f226 | 1497 | .ndo_do_ioctl = ip6_tnl_ioctl, |
1326c3d5 | 1498 | .ndo_change_mtu = ip6_tnl_change_mtu, |
8560f226 | 1499 | .ndo_get_stats = ip6_get_stats, |
ecf2c06a | 1500 | .ndo_get_iflink = ip6_tnl_get_iflink, |
1326c3d5 SH |
1501 | }; |
1502 | ||
8560f226 | 1503 | |
1da177e4 | 1504 | /** |
3144581c | 1505 | * ip6_tnl_dev_setup - setup virtual tunnel device |
1da177e4 LT |
1506 | * @dev: virtual device associated with tunnel |
1507 | * | |
1508 | * Description: | |
1509 | * Initialize function pointers and device parameters | |
1510 | **/ | |
1511 | ||
3144581c | 1512 | static void ip6_tnl_dev_setup(struct net_device *dev) |
1da177e4 | 1513 | { |
381601e5 AF |
1514 | struct ip6_tnl *t; |
1515 | ||
1326c3d5 | 1516 | dev->netdev_ops = &ip6_tnl_netdev_ops; |
8560f226 | 1517 | dev->destructor = ip6_dev_free; |
1da177e4 LT |
1518 | |
1519 | dev->type = ARPHRD_TUNNEL6; | |
67ba4152 IM |
1520 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr); |
1521 | dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr); | |
381601e5 AF |
1522 | t = netdev_priv(dev); |
1523 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
67ba4152 | 1524 | dev->mtu -= 8; |
1da177e4 LT |
1525 | dev->flags |= IFF_NOARP; |
1526 | dev->addr_len = sizeof(struct in6_addr); | |
02875878 | 1527 | netif_keep_dst(dev); |
e837735e ND |
1528 | /* This perm addr will be used as interface identifier by IPv6 */ |
1529 | dev->addr_assign_type = NET_ADDR_RANDOM; | |
1530 | eth_random_addr(dev->perm_addr); | |
1da177e4 LT |
1531 | } |
1532 | ||
1533 | ||
1534 | /** | |
3144581c | 1535 | * ip6_tnl_dev_init_gen - general initializer for all tunnel devices |
1da177e4 LT |
1536 | * @dev: virtual device associated with tunnel |
1537 | **/ | |
1538 | ||
8560f226 | 1539 | static inline int |
3144581c | 1540 | ip6_tnl_dev_init_gen(struct net_device *dev) |
1da177e4 | 1541 | { |
2941a486 | 1542 | struct ip6_tnl *t = netdev_priv(dev); |
cdf3464e | 1543 | int ret; |
8560f226 | 1544 | |
1da177e4 | 1545 | t->dev = dev; |
0bd87628 | 1546 | t->net = dev_net(dev); |
1c213bd2 | 1547 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
8560f226 ED |
1548 | if (!dev->tstats) |
1549 | return -ENOMEM; | |
cdf3464e | 1550 | |
607f725f | 1551 | ret = dst_cache_init(&t->dst_cache, GFP_KERNEL); |
cdf3464e MKL |
1552 | if (ret) { |
1553 | free_percpu(dev->tstats); | |
1554 | dev->tstats = NULL; | |
1555 | return ret; | |
1556 | } | |
1557 | ||
8560f226 | 1558 | return 0; |
1da177e4 LT |
1559 | } |
1560 | ||
1561 | /** | |
3144581c | 1562 | * ip6_tnl_dev_init - initializer for all non fallback tunnel devices |
1da177e4 LT |
1563 | * @dev: virtual device associated with tunnel |
1564 | **/ | |
1565 | ||
8560f226 | 1566 | static int ip6_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1567 | { |
2941a486 | 1568 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 ED |
1569 | int err = ip6_tnl_dev_init_gen(dev); |
1570 | ||
1571 | if (err) | |
1572 | return err; | |
3144581c | 1573 | ip6_tnl_link_config(t); |
8560f226 | 1574 | return 0; |
1da177e4 LT |
1575 | } |
1576 | ||
1577 | /** | |
3144581c | 1578 | * ip6_fb_tnl_dev_init - initializer for fallback tunnel device |
1da177e4 LT |
1579 | * @dev: fallback device |
1580 | * | |
1581 | * Return: 0 | |
1582 | **/ | |
1583 | ||
8560f226 | 1584 | static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1585 | { |
2941a486 | 1586 | struct ip6_tnl *t = netdev_priv(dev); |
3e6c9fb5 PE |
1587 | struct net *net = dev_net(dev); |
1588 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1589 | ||
502b0935 | 1590 | t->parms.proto = IPPROTO_IPV6; |
1da177e4 | 1591 | dev_hold(dev); |
d0087b29 | 1592 | |
cf778b00 | 1593 | rcu_assign_pointer(ip6n->tnls_wc[0], t); |
8560f226 | 1594 | return 0; |
1da177e4 LT |
1595 | } |
1596 | ||
0b112457 ND |
1597 | static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[]) |
1598 | { | |
1599 | u8 proto; | |
1600 | ||
c8965932 | 1601 | if (!data || !data[IFLA_IPTUN_PROTO]) |
0b112457 ND |
1602 | return 0; |
1603 | ||
1604 | proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1605 | if (proto != IPPROTO_IPV6 && | |
1606 | proto != IPPROTO_IPIP && | |
1607 | proto != 0) | |
1608 | return -EINVAL; | |
1609 | ||
1610 | return 0; | |
1611 | } | |
1612 | ||
1613 | static void ip6_tnl_netlink_parms(struct nlattr *data[], | |
1614 | struct __ip6_tnl_parm *parms) | |
1615 | { | |
1616 | memset(parms, 0, sizeof(*parms)); | |
1617 | ||
1618 | if (!data) | |
1619 | return; | |
1620 | ||
1621 | if (data[IFLA_IPTUN_LINK]) | |
1622 | parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); | |
1623 | ||
1624 | if (data[IFLA_IPTUN_LOCAL]) | |
67b61f6c | 1625 | parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]); |
0b112457 ND |
1626 | |
1627 | if (data[IFLA_IPTUN_REMOTE]) | |
67b61f6c | 1628 | parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]); |
0b112457 ND |
1629 | |
1630 | if (data[IFLA_IPTUN_TTL]) | |
1631 | parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]); | |
1632 | ||
1633 | if (data[IFLA_IPTUN_ENCAP_LIMIT]) | |
1634 | parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]); | |
1635 | ||
1636 | if (data[IFLA_IPTUN_FLOWINFO]) | |
1ff05fb7 | 1637 | parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]); |
0b112457 ND |
1638 | |
1639 | if (data[IFLA_IPTUN_FLAGS]) | |
1640 | parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]); | |
1641 | ||
1642 | if (data[IFLA_IPTUN_PROTO]) | |
1643 | parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1644 | } | |
1645 | ||
1646 | static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev, | |
1647 | struct nlattr *tb[], struct nlattr *data[]) | |
1648 | { | |
1649 | struct net *net = dev_net(dev); | |
37355565 | 1650 | struct ip6_tnl *nt, *t; |
0b112457 ND |
1651 | |
1652 | nt = netdev_priv(dev); | |
1653 | ip6_tnl_netlink_parms(data, &nt->parms); | |
1654 | ||
37355565 ND |
1655 | t = ip6_tnl_locate(net, &nt->parms, 0); |
1656 | if (!IS_ERR(t)) | |
0b112457 ND |
1657 | return -EEXIST; |
1658 | ||
1659 | return ip6_tnl_create2(dev); | |
1660 | } | |
1661 | ||
1662 | static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[], | |
1663 | struct nlattr *data[]) | |
1664 | { | |
0bd87628 | 1665 | struct ip6_tnl *t = netdev_priv(dev); |
0b112457 | 1666 | struct __ip6_tnl_parm p; |
0bd87628 | 1667 | struct net *net = t->net; |
0b112457 ND |
1668 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1669 | ||
1670 | if (dev == ip6n->fb_tnl_dev) | |
1671 | return -EINVAL; | |
1672 | ||
1673 | ip6_tnl_netlink_parms(data, &p); | |
1674 | ||
1675 | t = ip6_tnl_locate(net, &p, 0); | |
37355565 | 1676 | if (!IS_ERR(t)) { |
0b112457 ND |
1677 | if (t->dev != dev) |
1678 | return -EEXIST; | |
1679 | } else | |
1680 | t = netdev_priv(dev); | |
1681 | ||
1682 | return ip6_tnl_update(t, &p); | |
1683 | } | |
1684 | ||
1e9f3d6f ND |
1685 | static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head) |
1686 | { | |
1687 | struct net *net = dev_net(dev); | |
1688 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1689 | ||
1690 | if (dev != ip6n->fb_tnl_dev) | |
1691 | unregister_netdevice_queue(dev, head); | |
1692 | } | |
1693 | ||
b58d731a | 1694 | static size_t ip6_tnl_get_size(const struct net_device *dev) |
c075b130 ND |
1695 | { |
1696 | return | |
1697 | /* IFLA_IPTUN_LINK */ | |
1698 | nla_total_size(4) + | |
1699 | /* IFLA_IPTUN_LOCAL */ | |
1700 | nla_total_size(sizeof(struct in6_addr)) + | |
1701 | /* IFLA_IPTUN_REMOTE */ | |
1702 | nla_total_size(sizeof(struct in6_addr)) + | |
1703 | /* IFLA_IPTUN_TTL */ | |
1704 | nla_total_size(1) + | |
1705 | /* IFLA_IPTUN_ENCAP_LIMIT */ | |
1706 | nla_total_size(1) + | |
1707 | /* IFLA_IPTUN_FLOWINFO */ | |
1708 | nla_total_size(4) + | |
1709 | /* IFLA_IPTUN_FLAGS */ | |
1710 | nla_total_size(4) + | |
cfa323b6 ND |
1711 | /* IFLA_IPTUN_PROTO */ |
1712 | nla_total_size(1) + | |
c075b130 ND |
1713 | 0; |
1714 | } | |
1715 | ||
b58d731a | 1716 | static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev) |
c075b130 ND |
1717 | { |
1718 | struct ip6_tnl *tunnel = netdev_priv(dev); | |
1719 | struct __ip6_tnl_parm *parm = &tunnel->parms; | |
1720 | ||
1721 | if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || | |
930345ea JB |
1722 | nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) || |
1723 | nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) || | |
c075b130 ND |
1724 | nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) || |
1725 | nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) || | |
1726 | nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) || | |
cfa323b6 ND |
1727 | nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) || |
1728 | nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto)) | |
c075b130 ND |
1729 | goto nla_put_failure; |
1730 | return 0; | |
1731 | ||
1732 | nla_put_failure: | |
1733 | return -EMSGSIZE; | |
1734 | } | |
1735 | ||
1728d4fa ND |
1736 | struct net *ip6_tnl_get_link_net(const struct net_device *dev) |
1737 | { | |
1738 | struct ip6_tnl *tunnel = netdev_priv(dev); | |
1739 | ||
1740 | return tunnel->net; | |
1741 | } | |
1742 | EXPORT_SYMBOL(ip6_tnl_get_link_net); | |
1743 | ||
0b112457 ND |
1744 | static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = { |
1745 | [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, | |
1746 | [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) }, | |
1747 | [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) }, | |
1748 | [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, | |
1749 | [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 }, | |
1750 | [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 }, | |
1751 | [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 }, | |
1752 | [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, | |
1753 | }; | |
1754 | ||
c075b130 ND |
1755 | static struct rtnl_link_ops ip6_link_ops __read_mostly = { |
1756 | .kind = "ip6tnl", | |
1757 | .maxtype = IFLA_IPTUN_MAX, | |
0b112457 | 1758 | .policy = ip6_tnl_policy, |
c075b130 | 1759 | .priv_size = sizeof(struct ip6_tnl), |
0b112457 ND |
1760 | .setup = ip6_tnl_dev_setup, |
1761 | .validate = ip6_tnl_validate, | |
1762 | .newlink = ip6_tnl_newlink, | |
1763 | .changelink = ip6_tnl_changelink, | |
1e9f3d6f | 1764 | .dellink = ip6_tnl_dellink, |
b58d731a ND |
1765 | .get_size = ip6_tnl_get_size, |
1766 | .fill_info = ip6_tnl_fill_info, | |
1728d4fa | 1767 | .get_link_net = ip6_tnl_get_link_net, |
c075b130 ND |
1768 | }; |
1769 | ||
3ff2cfa5 | 1770 | static struct xfrm6_tunnel ip4ip6_handler __read_mostly = { |
c4d3efaf YK |
1771 | .handler = ip4ip6_rcv, |
1772 | .err_handler = ip4ip6_err, | |
1773 | .priority = 1, | |
1774 | }; | |
1775 | ||
3ff2cfa5 | 1776 | static struct xfrm6_tunnel ip6ip6_handler __read_mostly = { |
0303770d PM |
1777 | .handler = ip6ip6_rcv, |
1778 | .err_handler = ip6ip6_err, | |
d2acc347 | 1779 | .priority = 1, |
1da177e4 LT |
1780 | }; |
1781 | ||
1e9f3d6f | 1782 | static void __net_exit ip6_tnl_destroy_tunnels(struct net *net) |
3e6c9fb5 | 1783 | { |
1e9f3d6f | 1784 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
0bd87628 | 1785 | struct net_device *dev, *aux; |
3e6c9fb5 PE |
1786 | int h; |
1787 | struct ip6_tnl *t; | |
cf4432f5 | 1788 | LIST_HEAD(list); |
3e6c9fb5 | 1789 | |
0bd87628 ND |
1790 | for_each_netdev_safe(net, dev, aux) |
1791 | if (dev->rtnl_link_ops == &ip6_link_ops) | |
1792 | unregister_netdevice_queue(dev, &list); | |
1793 | ||
3e6c9fb5 | 1794 | for (h = 0; h < HASH_SIZE; h++) { |
94767632 | 1795 | t = rtnl_dereference(ip6n->tnls_r_l[h]); |
53b24b8f | 1796 | while (t) { |
0bd87628 ND |
1797 | /* If dev is in the same netns, it has already |
1798 | * been added to the list by the previous loop. | |
1799 | */ | |
1800 | if (!net_eq(dev_net(t->dev), net)) | |
1801 | unregister_netdevice_queue(t->dev, &list); | |
94767632 | 1802 | t = rtnl_dereference(t->next); |
cf4432f5 | 1803 | } |
3e6c9fb5 PE |
1804 | } |
1805 | ||
cf4432f5 | 1806 | unregister_netdevice_many(&list); |
3e6c9fb5 PE |
1807 | } |
1808 | ||
2c8c1e72 | 1809 | static int __net_init ip6_tnl_init_net(struct net *net) |
13eeb8e9 | 1810 | { |
ac31cd3c | 1811 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
731abb9c | 1812 | struct ip6_tnl *t = NULL; |
13eeb8e9 | 1813 | int err; |
13eeb8e9 | 1814 | |
3e6c9fb5 PE |
1815 | ip6n->tnls[0] = ip6n->tnls_wc; |
1816 | ip6n->tnls[1] = ip6n->tnls_r_l; | |
1817 | ||
15820e12 PE |
1818 | err = -ENOMEM; |
1819 | ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", | |
c835a677 | 1820 | NET_NAME_UNKNOWN, ip6_tnl_dev_setup); |
15820e12 PE |
1821 | |
1822 | if (!ip6n->fb_tnl_dev) | |
1823 | goto err_alloc_dev; | |
be77e593 | 1824 | dev_net_set(ip6n->fb_tnl_dev, net); |
bb814094 | 1825 | ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops; |
0bd87628 ND |
1826 | /* FB netdevice is special: we have one, and only one per netns. |
1827 | * Allowing to move it to another netns is clearly unsafe. | |
1828 | */ | |
1829 | ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL; | |
15820e12 | 1830 | |
8560f226 ED |
1831 | err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); |
1832 | if (err < 0) | |
1833 | goto err_register; | |
15820e12 PE |
1834 | |
1835 | err = register_netdev(ip6n->fb_tnl_dev); | |
1836 | if (err < 0) | |
1837 | goto err_register; | |
731abb9c JB |
1838 | |
1839 | t = netdev_priv(ip6n->fb_tnl_dev); | |
1840 | ||
1841 | strcpy(t->parms.name, ip6n->fb_tnl_dev->name); | |
13eeb8e9 PE |
1842 | return 0; |
1843 | ||
15820e12 | 1844 | err_register: |
8560f226 | 1845 | ip6_dev_free(ip6n->fb_tnl_dev); |
15820e12 | 1846 | err_alloc_dev: |
13eeb8e9 PE |
1847 | return err; |
1848 | } | |
1849 | ||
2c8c1e72 | 1850 | static void __net_exit ip6_tnl_exit_net(struct net *net) |
13eeb8e9 | 1851 | { |
3e6c9fb5 | 1852 | rtnl_lock(); |
1e9f3d6f | 1853 | ip6_tnl_destroy_tunnels(net); |
3e6c9fb5 | 1854 | rtnl_unlock(); |
13eeb8e9 PE |
1855 | } |
1856 | ||
1857 | static struct pernet_operations ip6_tnl_net_ops = { | |
1858 | .init = ip6_tnl_init_net, | |
1859 | .exit = ip6_tnl_exit_net, | |
ac31cd3c EB |
1860 | .id = &ip6_tnl_net_id, |
1861 | .size = sizeof(struct ip6_tnl_net), | |
13eeb8e9 PE |
1862 | }; |
1863 | ||
1da177e4 LT |
1864 | /** |
1865 | * ip6_tunnel_init - register protocol and reserve needed resources | |
1866 | * | |
1867 | * Return: 0 on success | |
1868 | **/ | |
1869 | ||
1870 | static int __init ip6_tunnel_init(void) | |
1871 | { | |
1872 | int err; | |
1873 | ||
d5aa407f AD |
1874 | err = register_pernet_device(&ip6_tnl_net_ops); |
1875 | if (err < 0) | |
1876 | goto out_pernet; | |
1877 | ||
1878 | err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET); | |
1879 | if (err < 0) { | |
f3213831 | 1880 | pr_err("%s: can't register ip4ip6\n", __func__); |
d5aa407f | 1881 | goto out_ip4ip6; |
c4d3efaf YK |
1882 | } |
1883 | ||
d5aa407f AD |
1884 | err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6); |
1885 | if (err < 0) { | |
f3213831 | 1886 | pr_err("%s: can't register ip6ip6\n", __func__); |
d5aa407f | 1887 | goto out_ip6ip6; |
1da177e4 | 1888 | } |
c075b130 ND |
1889 | err = rtnl_link_register(&ip6_link_ops); |
1890 | if (err < 0) | |
1891 | goto rtnl_link_failed; | |
13eeb8e9 | 1892 | |
1da177e4 | 1893 | return 0; |
d5aa407f | 1894 | |
c075b130 ND |
1895 | rtnl_link_failed: |
1896 | xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6); | |
d5aa407f | 1897 | out_ip6ip6: |
c4d3efaf | 1898 | xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); |
d5aa407f AD |
1899 | out_ip4ip6: |
1900 | unregister_pernet_device(&ip6_tnl_net_ops); | |
1901 | out_pernet: | |
1da177e4 LT |
1902 | return err; |
1903 | } | |
1904 | ||
1905 | /** | |
1906 | * ip6_tunnel_cleanup - free resources and unregister protocol | |
1907 | **/ | |
1908 | ||
1909 | static void __exit ip6_tunnel_cleanup(void) | |
1910 | { | |
c075b130 | 1911 | rtnl_link_unregister(&ip6_link_ops); |
c4d3efaf | 1912 | if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) |
f3213831 | 1913 | pr_info("%s: can't deregister ip4ip6\n", __func__); |
c4d3efaf | 1914 | |
73d605d1 | 1915 | if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) |
f3213831 | 1916 | pr_info("%s: can't deregister ip6ip6\n", __func__); |
1da177e4 | 1917 | |
ac31cd3c | 1918 | unregister_pernet_device(&ip6_tnl_net_ops); |
1da177e4 LT |
1919 | } |
1920 | ||
1921 | module_init(ip6_tunnel_init); | |
1922 | module_exit(ip6_tunnel_cleanup); |