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 | ||
0d3c703a | 241 | gro_cells_destroy(&t->gro_cells); |
607f725f | 242 | dst_cache_destroy(&t->dst_cache); |
8560f226 ED |
243 | free_percpu(dev->tstats); |
244 | free_netdev(dev); | |
245 | } | |
246 | ||
0b112457 ND |
247 | static int ip6_tnl_create2(struct net_device *dev) |
248 | { | |
249 | struct ip6_tnl *t = netdev_priv(dev); | |
250 | struct net *net = dev_net(dev); | |
251 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
252 | int err; | |
253 | ||
254 | t = netdev_priv(dev); | |
0b112457 | 255 | |
b6ee376c | 256 | dev->rtnl_link_ops = &ip6_link_ops; |
0b112457 ND |
257 | err = register_netdevice(dev); |
258 | if (err < 0) | |
259 | goto out; | |
260 | ||
261 | strcpy(t->parms.name, dev->name); | |
0b112457 ND |
262 | |
263 | dev_hold(dev); | |
264 | ip6_tnl_link(ip6n, t); | |
265 | return 0; | |
266 | ||
267 | out: | |
268 | return err; | |
269 | } | |
270 | ||
1da177e4 | 271 | /** |
2c53040f | 272 | * ip6_tnl_create - create a new tunnel |
1da177e4 LT |
273 | * @p: tunnel parameters |
274 | * @pt: pointer to new tunnel | |
275 | * | |
276 | * Description: | |
277 | * Create tunnel matching given parameters. | |
1ab1457c YH |
278 | * |
279 | * Return: | |
37355565 | 280 | * created tunnel or error pointer |
1da177e4 LT |
281 | **/ |
282 | ||
c12b395a | 283 | static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p) |
1da177e4 LT |
284 | { |
285 | struct net_device *dev; | |
286 | struct ip6_tnl *t; | |
287 | char name[IFNAMSIZ]; | |
37355565 | 288 | int err = -ENOMEM; |
1da177e4 | 289 | |
34cc7ba6 | 290 | if (p->name[0]) |
1da177e4 | 291 | strlcpy(name, p->name, IFNAMSIZ); |
34cc7ba6 PE |
292 | else |
293 | sprintf(name, "ip6tnl%%d"); | |
294 | ||
c835a677 TG |
295 | dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, |
296 | ip6_tnl_dev_setup); | |
63159f29 | 297 | if (!dev) |
567131a7 | 298 | goto failed; |
1da177e4 | 299 | |
554eb277 PE |
300 | dev_net_set(dev, net); |
301 | ||
2941a486 | 302 | t = netdev_priv(dev); |
1da177e4 | 303 | t->parms = *p; |
0bd87628 | 304 | t->net = dev_net(dev); |
0b112457 | 305 | err = ip6_tnl_create2(dev); |
8560f226 ED |
306 | if (err < 0) |
307 | goto failed_free; | |
1da177e4 | 308 | |
567131a7 | 309 | return t; |
b37d428b PE |
310 | |
311 | failed_free: | |
8560f226 | 312 | ip6_dev_free(dev); |
567131a7 | 313 | failed: |
37355565 | 314 | return ERR_PTR(err); |
1da177e4 LT |
315 | } |
316 | ||
317 | /** | |
3144581c | 318 | * ip6_tnl_locate - find or create tunnel matching given parameters |
1ab1457c | 319 | * @p: tunnel parameters |
1da177e4 LT |
320 | * @create: != 0 if allowed to create new tunnel if no match found |
321 | * | |
322 | * Description: | |
3144581c | 323 | * ip6_tnl_locate() first tries to locate an existing tunnel |
1da177e4 LT |
324 | * based on @parms. If this is unsuccessful, but @create is set a new |
325 | * tunnel device is created and registered for use. | |
326 | * | |
327 | * Return: | |
37355565 | 328 | * matching tunnel or error pointer |
1da177e4 LT |
329 | **/ |
330 | ||
2dd02c89 | 331 | static struct ip6_tnl *ip6_tnl_locate(struct net *net, |
c12b395a | 332 | struct __ip6_tnl_parm *p, int create) |
1da177e4 | 333 | { |
b71d1d42 ED |
334 | const struct in6_addr *remote = &p->raddr; |
335 | const struct in6_addr *local = &p->laddr; | |
94767632 | 336 | struct ip6_tnl __rcu **tp; |
1da177e4 | 337 | struct ip6_tnl *t; |
2dd02c89 | 338 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 339 | |
94767632 ED |
340 | for (tp = ip6_tnl_bucket(ip6n, p); |
341 | (t = rtnl_dereference(*tp)) != NULL; | |
342 | tp = &t->next) { | |
1da177e4 | 343 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
2b0bb01b SK |
344 | ipv6_addr_equal(remote, &t->parms.raddr)) { |
345 | if (create) | |
37355565 | 346 | return ERR_PTR(-EEXIST); |
2b0bb01b | 347 | |
567131a7 | 348 | return t; |
2b0bb01b | 349 | } |
1da177e4 LT |
350 | } |
351 | if (!create) | |
37355565 | 352 | return ERR_PTR(-ENODEV); |
2dd02c89 | 353 | return ip6_tnl_create(net, p); |
1da177e4 LT |
354 | } |
355 | ||
356 | /** | |
3144581c | 357 | * ip6_tnl_dev_uninit - tunnel device uninitializer |
1da177e4 | 358 | * @dev: the device to be destroyed |
1ab1457c | 359 | * |
1da177e4 | 360 | * Description: |
3144581c | 361 | * ip6_tnl_dev_uninit() removes tunnel from its list |
1da177e4 LT |
362 | **/ |
363 | ||
364 | static void | |
3144581c | 365 | ip6_tnl_dev_uninit(struct net_device *dev) |
1da177e4 | 366 | { |
2941a486 | 367 | struct ip6_tnl *t = netdev_priv(dev); |
0bd87628 | 368 | struct net *net = t->net; |
2dd02c89 | 369 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 370 | |
94767632 | 371 | if (dev == ip6n->fb_tnl_dev) |
a9b3cd7f | 372 | RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL); |
94767632 | 373 | else |
2dd02c89 | 374 | ip6_tnl_unlink(ip6n, t); |
607f725f | 375 | dst_cache_reset(&t->dst_cache); |
1da177e4 LT |
376 | dev_put(dev); |
377 | } | |
378 | ||
379 | /** | |
380 | * parse_tvl_tnl_enc_lim - handle encapsulation limit option | |
381 | * @skb: received socket buffer | |
382 | * | |
1ab1457c YH |
383 | * Return: |
384 | * 0 if none was found, | |
1da177e4 LT |
385 | * else index to encapsulation limit |
386 | **/ | |
387 | ||
c12b395a | 388 | __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw) |
1da177e4 | 389 | { |
b71d1d42 | 390 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw; |
1da177e4 | 391 | __u8 nexthdr = ipv6h->nexthdr; |
67ba4152 | 392 | __u16 off = sizeof(*ipv6h); |
1da177e4 LT |
393 | |
394 | while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { | |
395 | __u16 optlen = 0; | |
396 | struct ipv6_opt_hdr *hdr; | |
67ba4152 | 397 | if (raw + off + sizeof(*hdr) > skb->data && |
1da177e4 LT |
398 | !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr))) |
399 | break; | |
400 | ||
401 | hdr = (struct ipv6_opt_hdr *) (raw + off); | |
402 | if (nexthdr == NEXTHDR_FRAGMENT) { | |
403 | struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; | |
404 | if (frag_hdr->frag_off) | |
405 | break; | |
406 | optlen = 8; | |
407 | } else if (nexthdr == NEXTHDR_AUTH) { | |
408 | optlen = (hdr->hdrlen + 2) << 2; | |
409 | } else { | |
410 | optlen = ipv6_optlen(hdr); | |
411 | } | |
412 | if (nexthdr == NEXTHDR_DEST) { | |
413 | __u16 i = off + 2; | |
414 | while (1) { | |
415 | struct ipv6_tlv_tnl_enc_lim *tel; | |
416 | ||
417 | /* No more room for encapsulation limit */ | |
418 | if (i + sizeof (*tel) > off + optlen) | |
419 | break; | |
420 | ||
421 | tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i]; | |
422 | /* return index of option if found and valid */ | |
423 | if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && | |
424 | tel->length == 1) | |
425 | return i; | |
426 | /* else jump to next option */ | |
427 | if (tel->type) | |
428 | i += tel->length + 2; | |
429 | else | |
430 | i++; | |
431 | } | |
432 | } | |
433 | nexthdr = hdr->nexthdr; | |
434 | off += optlen; | |
435 | } | |
436 | return 0; | |
437 | } | |
c12b395a | 438 | EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim); |
1da177e4 LT |
439 | |
440 | /** | |
e490d1d8 | 441 | * ip6_tnl_err - tunnel error handler |
1da177e4 LT |
442 | * |
443 | * Description: | |
e490d1d8 | 444 | * ip6_tnl_err() should handle errors in the tunnel according |
1da177e4 LT |
445 | * to the specifications in RFC 2473. |
446 | **/ | |
447 | ||
d2acc347 | 448 | static int |
502b0935 | 449 | ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, |
d5fdd6ba | 450 | u8 *type, u8 *code, int *msg, __u32 *info, int offset) |
1da177e4 | 451 | { |
b71d1d42 | 452 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data; |
1da177e4 LT |
453 | struct ip6_tnl *t; |
454 | int rel_msg = 0; | |
d5fdd6ba BH |
455 | u8 rel_type = ICMPV6_DEST_UNREACH; |
456 | u8 rel_code = ICMPV6_ADDR_UNREACH; | |
acf722f7 | 457 | u8 tproto; |
1da177e4 LT |
458 | __u32 rel_info = 0; |
459 | __u16 len; | |
d2acc347 | 460 | int err = -ENOENT; |
1da177e4 | 461 | |
1ab1457c YH |
462 | /* If the packet doesn't contain the original IPv6 header we are |
463 | in trouble since we might need the source address for further | |
1da177e4 LT |
464 | processing of the error. */ |
465 | ||
2922bc8a | 466 | rcu_read_lock(); |
e5d08d71 | 467 | t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, &ipv6h->saddr); |
63159f29 | 468 | if (!t) |
1da177e4 LT |
469 | goto out; |
470 | ||
acf722f7 AA |
471 | tproto = ACCESS_ONCE(t->parms.proto); |
472 | if (tproto != ipproto && tproto != 0) | |
502b0935 YK |
473 | goto out; |
474 | ||
d2acc347 HX |
475 | err = 0; |
476 | ||
e490d1d8 | 477 | switch (*type) { |
1da177e4 LT |
478 | __u32 teli; |
479 | struct ipv6_tlv_tnl_enc_lim *tel; | |
480 | __u32 mtu; | |
481 | case ICMPV6_DEST_UNREACH: | |
17a10c92 MB |
482 | net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n", |
483 | t->parms.name); | |
1da177e4 LT |
484 | rel_msg = 1; |
485 | break; | |
486 | case ICMPV6_TIME_EXCEED: | |
e490d1d8 | 487 | if ((*code) == ICMPV6_EXC_HOPLIMIT) { |
17a10c92 MB |
488 | net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", |
489 | t->parms.name); | |
1da177e4 LT |
490 | rel_msg = 1; |
491 | } | |
492 | break; | |
493 | case ICMPV6_PARAMPROB: | |
107a5fe6 | 494 | teli = 0; |
e490d1d8 | 495 | if ((*code) == ICMPV6_HDR_FIELD) |
c12b395a | 496 | teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); |
1da177e4 | 497 | |
704eae1f | 498 | if (teli && teli == *info - 2) { |
1da177e4 LT |
499 | tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; |
500 | if (tel->encap_limit == 0) { | |
17a10c92 MB |
501 | net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", |
502 | t->parms.name); | |
1da177e4 LT |
503 | rel_msg = 1; |
504 | } | |
e87cc472 | 505 | } else { |
17a10c92 MB |
506 | net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n", |
507 | t->parms.name); | |
1da177e4 LT |
508 | } |
509 | break; | |
510 | case ICMPV6_PKT_TOOBIG: | |
704eae1f | 511 | mtu = *info - offset; |
1da177e4 LT |
512 | if (mtu < IPV6_MIN_MTU) |
513 | mtu = IPV6_MIN_MTU; | |
514 | t->dev->mtu = mtu; | |
515 | ||
e5d08d71 IM |
516 | len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len); |
517 | if (len > mtu) { | |
1da177e4 LT |
518 | rel_type = ICMPV6_PKT_TOOBIG; |
519 | rel_code = 0; | |
520 | rel_info = mtu; | |
521 | rel_msg = 1; | |
522 | } | |
523 | break; | |
524 | } | |
e490d1d8 YK |
525 | |
526 | *type = rel_type; | |
527 | *code = rel_code; | |
528 | *info = rel_info; | |
529 | *msg = rel_msg; | |
530 | ||
531 | out: | |
2922bc8a | 532 | rcu_read_unlock(); |
e490d1d8 YK |
533 | return err; |
534 | } | |
535 | ||
c4d3efaf YK |
536 | static int |
537 | ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 538 | u8 type, u8 code, int offset, __be32 info) |
c4d3efaf YK |
539 | { |
540 | int rel_msg = 0; | |
d5fdd6ba BH |
541 | u8 rel_type = type; |
542 | u8 rel_code = code; | |
704eae1f | 543 | __u32 rel_info = ntohl(info); |
c4d3efaf YK |
544 | int err; |
545 | struct sk_buff *skb2; | |
b71d1d42 | 546 | const struct iphdr *eiph; |
c4d3efaf | 547 | struct rtable *rt; |
31e4543d | 548 | struct flowi4 fl4; |
c4d3efaf | 549 | |
502b0935 YK |
550 | err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, |
551 | &rel_msg, &rel_info, offset); | |
c4d3efaf YK |
552 | if (err < 0) |
553 | return err; | |
554 | ||
555 | if (rel_msg == 0) | |
556 | return 0; | |
557 | ||
558 | switch (rel_type) { | |
559 | case ICMPV6_DEST_UNREACH: | |
560 | if (rel_code != ICMPV6_ADDR_UNREACH) | |
561 | return 0; | |
562 | rel_type = ICMP_DEST_UNREACH; | |
563 | rel_code = ICMP_HOST_UNREACH; | |
564 | break; | |
565 | case ICMPV6_PKT_TOOBIG: | |
566 | if (rel_code != 0) | |
567 | return 0; | |
568 | rel_type = ICMP_DEST_UNREACH; | |
569 | rel_code = ICMP_FRAG_NEEDED; | |
570 | break; | |
ec18d9a2 DM |
571 | case NDISC_REDIRECT: |
572 | rel_type = ICMP_REDIRECT; | |
573 | rel_code = ICMP_REDIR_HOST; | |
c4d3efaf YK |
574 | default: |
575 | return 0; | |
576 | } | |
577 | ||
578 | if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) | |
579 | return 0; | |
580 | ||
581 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
582 | if (!skb2) | |
583 | return 0; | |
584 | ||
adf30907 ED |
585 | skb_dst_drop(skb2); |
586 | ||
c4d3efaf | 587 | skb_pull(skb2, offset); |
c1d2bbe1 | 588 | skb_reset_network_header(skb2); |
eddc9ec5 | 589 | eiph = ip_hdr(skb2); |
c4d3efaf YK |
590 | |
591 | /* Try to guess incoming interface */ | |
31e4543d | 592 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, |
78fbfd8a DM |
593 | eiph->saddr, 0, |
594 | 0, 0, | |
595 | IPPROTO_IPIP, RT_TOS(eiph->tos), 0); | |
b23dd4fe | 596 | if (IS_ERR(rt)) |
c4d3efaf YK |
597 | goto out; |
598 | ||
d8d1f30b | 599 | skb2->dev = rt->dst.dev; |
c4d3efaf YK |
600 | |
601 | /* route "incoming" packet */ | |
602 | if (rt->rt_flags & RTCF_LOCAL) { | |
603 | ip_rt_put(rt); | |
604 | rt = NULL; | |
31e4543d | 605 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, |
78fbfd8a DM |
606 | eiph->daddr, eiph->saddr, |
607 | 0, 0, | |
608 | IPPROTO_IPIP, | |
609 | RT_TOS(eiph->tos), 0); | |
b23dd4fe | 610 | if (IS_ERR(rt) || |
d8d1f30b | 611 | rt->dst.dev->type != ARPHRD_TUNNEL) { |
b23dd4fe DM |
612 | if (!IS_ERR(rt)) |
613 | ip_rt_put(rt); | |
c4d3efaf YK |
614 | goto out; |
615 | } | |
b23dd4fe | 616 | skb_dst_set(skb2, &rt->dst); |
c4d3efaf YK |
617 | } else { |
618 | ip_rt_put(rt); | |
619 | if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, | |
620 | skb2->dev) || | |
adf30907 | 621 | skb_dst(skb2)->dev->type != ARPHRD_TUNNEL) |
c4d3efaf YK |
622 | goto out; |
623 | } | |
624 | ||
625 | /* change mtu on this route */ | |
626 | if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { | |
adf30907 | 627 | if (rel_info > dst_mtu(skb_dst(skb2))) |
c4d3efaf YK |
628 | goto out; |
629 | ||
6700c270 | 630 | skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2, rel_info); |
c4d3efaf | 631 | } |
1ed5c48f | 632 | if (rel_type == ICMP_REDIRECT) |
6700c270 | 633 | skb_dst(skb2)->ops->redirect(skb_dst(skb2), NULL, skb2); |
c4d3efaf | 634 | |
704eae1f | 635 | icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); |
c4d3efaf YK |
636 | |
637 | out: | |
638 | kfree_skb(skb2); | |
639 | return 0; | |
640 | } | |
641 | ||
e490d1d8 YK |
642 | static int |
643 | ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 644 | u8 type, u8 code, int offset, __be32 info) |
e490d1d8 YK |
645 | { |
646 | int rel_msg = 0; | |
d5fdd6ba BH |
647 | u8 rel_type = type; |
648 | u8 rel_code = code; | |
704eae1f | 649 | __u32 rel_info = ntohl(info); |
e490d1d8 YK |
650 | int err; |
651 | ||
502b0935 YK |
652 | err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, |
653 | &rel_msg, &rel_info, offset); | |
e490d1d8 YK |
654 | if (err < 0) |
655 | return err; | |
656 | ||
657 | if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { | |
1da177e4 LT |
658 | struct rt6_info *rt; |
659 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
305d4b3c | 660 | |
1da177e4 | 661 | if (!skb2) |
e490d1d8 | 662 | return 0; |
1da177e4 | 663 | |
adf30907 | 664 | skb_dst_drop(skb2); |
1da177e4 | 665 | skb_pull(skb2, offset); |
c1d2bbe1 | 666 | skb_reset_network_header(skb2); |
1da177e4 LT |
667 | |
668 | /* Try to guess incoming interface */ | |
2f7f54b7 PE |
669 | rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, |
670 | NULL, 0, 0); | |
1da177e4 | 671 | |
d1918542 DM |
672 | if (rt && rt->dst.dev) |
673 | skb2->dev = rt->dst.dev; | |
1da177e4 | 674 | |
3ffe533c | 675 | icmpv6_send(skb2, rel_type, rel_code, rel_info); |
1da177e4 | 676 | |
94e187c0 | 677 | ip6_rt_put(rt); |
1da177e4 LT |
678 | |
679 | kfree_skb(skb2); | |
680 | } | |
e490d1d8 YK |
681 | |
682 | return 0; | |
1da177e4 LT |
683 | } |
684 | ||
f4e0b4c5 ND |
685 | static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
686 | const struct ipv6hdr *ipv6h, | |
687 | struct sk_buff *skb) | |
c4d3efaf YK |
688 | { |
689 | __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; | |
690 | ||
691 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) | |
eddc9ec5 | 692 | ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); |
c4d3efaf | 693 | |
f4e0b4c5 | 694 | return IP6_ECN_decapsulate(ipv6h, skb); |
c4d3efaf YK |
695 | } |
696 | ||
f4e0b4c5 ND |
697 | static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
698 | const struct ipv6hdr *ipv6h, | |
699 | struct sk_buff *skb) | |
1da177e4 | 700 | { |
8359925b | 701 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) |
29bb43b4 | 702 | ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); |
1da177e4 | 703 | |
f4e0b4c5 | 704 | return IP6_ECN_decapsulate(ipv6h, skb); |
1da177e4 | 705 | } |
8359925b | 706 | |
c12b395a | 707 | __u32 ip6_tnl_get_cap(struct ip6_tnl *t, |
d0087b29 VN |
708 | const struct in6_addr *laddr, |
709 | const struct in6_addr *raddr) | |
710 | { | |
c12b395a | 711 | struct __ip6_tnl_parm *p = &t->parms; |
d0087b29 VN |
712 | int ltype = ipv6_addr_type(laddr); |
713 | int rtype = ipv6_addr_type(raddr); | |
714 | __u32 flags = 0; | |
715 | ||
716 | if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) { | |
717 | flags = IP6_TNL_F_CAP_PER_PACKET; | |
718 | } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
719 | rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
720 | !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && | |
721 | (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { | |
722 | if (ltype&IPV6_ADDR_UNICAST) | |
723 | flags |= IP6_TNL_F_CAP_XMIT; | |
724 | if (rtype&IPV6_ADDR_UNICAST) | |
725 | flags |= IP6_TNL_F_CAP_RCV; | |
726 | } | |
727 | return flags; | |
728 | } | |
c12b395a | 729 | EXPORT_SYMBOL(ip6_tnl_get_cap); |
d0087b29 | 730 | |
f1a28eab | 731 | /* called with rcu_read_lock() */ |
c12b395a | 732 | int ip6_tnl_rcv_ctl(struct ip6_tnl *t, |
d0087b29 VN |
733 | const struct in6_addr *laddr, |
734 | const struct in6_addr *raddr) | |
09c6bbf0 | 735 | { |
c12b395a | 736 | struct __ip6_tnl_parm *p = &t->parms; |
09c6bbf0 | 737 | int ret = 0; |
0bd87628 | 738 | struct net *net = t->net; |
09c6bbf0 | 739 | |
d0087b29 VN |
740 | if ((p->flags & IP6_TNL_F_CAP_RCV) || |
741 | ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && | |
742 | (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) { | |
1ab1457c | 743 | struct net_device *ldev = NULL; |
09c6bbf0 VN |
744 | |
745 | if (p->link) | |
f1a28eab | 746 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 747 | |
d0087b29 VN |
748 | if ((ipv6_addr_is_multicast(laddr) || |
749 | likely(ipv6_chk_addr(net, laddr, ldev, 0))) && | |
750 | likely(!ipv6_chk_addr(net, raddr, NULL, 0))) | |
09c6bbf0 | 751 | ret = 1; |
09c6bbf0 VN |
752 | } |
753 | return ret; | |
754 | } | |
c12b395a | 755 | EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl); |
1da177e4 | 756 | |
0d3c703a TH |
757 | static int __ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb, |
758 | const struct tnl_ptk_info *tpi, | |
759 | struct metadata_dst *tun_dst, | |
760 | int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, | |
761 | const struct ipv6hdr *ipv6h, | |
762 | struct sk_buff *skb), | |
763 | bool log_ecn_err) | |
1da177e4 | 764 | { |
0d3c703a | 765 | struct pcpu_sw_netstats *tstats; |
b71d1d42 | 766 | const struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
f4e0b4c5 | 767 | int err; |
1da177e4 | 768 | |
0d3c703a TH |
769 | if ((!(tpi->flags & TUNNEL_CSUM) && |
770 | (tunnel->parms.i_flags & TUNNEL_CSUM)) || | |
771 | ((tpi->flags & TUNNEL_CSUM) && | |
772 | !(tunnel->parms.i_flags & TUNNEL_CSUM))) { | |
773 | tunnel->dev->stats.rx_crc_errors++; | |
774 | tunnel->dev->stats.rx_errors++; | |
775 | goto drop; | |
776 | } | |
8560f226 | 777 | |
0d3c703a TH |
778 | if (tunnel->parms.i_flags & TUNNEL_SEQ) { |
779 | if (!(tpi->flags & TUNNEL_SEQ) || | |
780 | (tunnel->i_seqno && | |
781 | (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) { | |
782 | tunnel->dev->stats.rx_fifo_errors++; | |
783 | tunnel->dev->stats.rx_errors++; | |
784 | goto drop; | |
502b0935 | 785 | } |
0d3c703a TH |
786 | tunnel->i_seqno = ntohl(tpi->seq) + 1; |
787 | } | |
502b0935 | 788 | |
0d3c703a | 789 | skb->protocol = tpi->proto; |
1da177e4 | 790 | |
0d3c703a TH |
791 | /* Warning: All skb pointers will be invalidated! */ |
792 | if (tunnel->dev->type == ARPHRD_ETHER) { | |
793 | if (!pskb_may_pull(skb, ETH_HLEN)) { | |
794 | tunnel->dev->stats.rx_length_errors++; | |
795 | tunnel->dev->stats.rx_errors++; | |
796 | goto drop; | |
1da177e4 | 797 | } |
0d3c703a TH |
798 | |
799 | ipv6h = ipv6_hdr(skb); | |
800 | skb->protocol = eth_type_trans(skb, tunnel->dev); | |
801 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); | |
802 | } else { | |
803 | skb->dev = tunnel->dev; | |
804 | } | |
805 | ||
806 | skb_reset_network_header(skb); | |
807 | memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); | |
808 | ||
809 | __skb_tunnel_rx(skb, tunnel->dev, tunnel->net); | |
810 | ||
811 | err = dscp_ecn_decapsulate(tunnel, ipv6h, skb); | |
812 | if (unlikely(err)) { | |
813 | if (log_ecn_err) | |
814 | net_info_ratelimited("non-ECT from %pI6 with DS=%#x\n", | |
815 | &ipv6h->saddr, | |
816 | ipv6_get_dsfield(ipv6h)); | |
817 | if (err > 1) { | |
818 | ++tunnel->dev->stats.rx_frame_errors; | |
819 | ++tunnel->dev->stats.rx_errors; | |
820 | goto drop; | |
f4e0b4c5 | 821 | } |
0d3c703a | 822 | } |
f4e0b4c5 | 823 | |
0d3c703a TH |
824 | tstats = this_cpu_ptr(tunnel->dev->tstats); |
825 | u64_stats_update_begin(&tstats->syncp); | |
826 | tstats->rx_packets++; | |
827 | tstats->rx_bytes += skb->len; | |
828 | u64_stats_update_end(&tstats->syncp); | |
8560f226 | 829 | |
0d3c703a | 830 | skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev))); |
8990f468 | 831 | |
0d3c703a TH |
832 | gro_cells_receive(&tunnel->gro_cells, skb); |
833 | return 0; | |
834 | ||
835 | drop: | |
836 | kfree_skb(skb); | |
837 | return 0; | |
838 | } | |
839 | ||
840 | int ip6_tnl_rcv(struct ip6_tnl *t, struct sk_buff *skb, | |
841 | const struct tnl_ptk_info *tpi, | |
842 | struct metadata_dst *tun_dst, | |
843 | bool log_ecn_err) | |
844 | { | |
845 | return __ip6_tnl_rcv(t, skb, tpi, NULL, ip6ip6_dscp_ecn_decapsulate, | |
846 | log_ecn_err); | |
847 | } | |
848 | EXPORT_SYMBOL(ip6_tnl_rcv); | |
849 | ||
850 | static const struct tnl_ptk_info tpi_v6 = { | |
851 | /* no tunnel info required for ipxip6. */ | |
852 | .proto = htons(ETH_P_IPV6), | |
853 | }; | |
854 | ||
855 | static const struct tnl_ptk_info tpi_v4 = { | |
856 | /* no tunnel info required for ipxip6. */ | |
857 | .proto = htons(ETH_P_IP), | |
858 | }; | |
859 | ||
860 | static int ipxip6_rcv(struct sk_buff *skb, u8 ipproto, | |
861 | const struct tnl_ptk_info *tpi, | |
862 | int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, | |
863 | const struct ipv6hdr *ipv6h, | |
864 | struct sk_buff *skb)) | |
865 | { | |
866 | struct ip6_tnl *t; | |
867 | const struct ipv6hdr *ipv6h = ipv6_hdr(skb); | |
868 | int ret = -1; | |
869 | ||
870 | rcu_read_lock(); | |
871 | t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr); | |
872 | ||
873 | if (t) { | |
874 | u8 tproto = ACCESS_ONCE(t->parms.proto); | |
875 | ||
876 | if (tproto != ipproto && tproto != 0) | |
877 | goto drop; | |
878 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
879 | goto drop; | |
880 | if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) | |
881 | goto drop; | |
882 | if (iptunnel_pull_header(skb, 0, tpi->proto, false)) | |
883 | goto drop; | |
884 | ret = __ip6_tnl_rcv(t, skb, tpi, NULL, dscp_ecn_decapsulate, | |
885 | log_ecn_error); | |
1da177e4 | 886 | } |
0d3c703a | 887 | |
2922bc8a | 888 | rcu_read_unlock(); |
50fba2aa | 889 | |
0d3c703a TH |
890 | return ret; |
891 | ||
892 | drop: | |
893 | rcu_read_unlock(); | |
50fba2aa HX |
894 | kfree_skb(skb); |
895 | return 0; | |
1da177e4 LT |
896 | } |
897 | ||
c4d3efaf YK |
898 | static int ip4ip6_rcv(struct sk_buff *skb) |
899 | { | |
ca4aa976 | 900 | return ipxip6_rcv(skb, IPPROTO_IPIP, &tpi_v4, |
0d3c703a | 901 | ip4ip6_dscp_ecn_decapsulate); |
c4d3efaf YK |
902 | } |
903 | ||
8359925b YK |
904 | static int ip6ip6_rcv(struct sk_buff *skb) |
905 | { | |
0d3c703a TH |
906 | return ipxip6_rcv(skb, IPPROTO_IPV6, &tpi_v6, |
907 | ip6ip6_dscp_ecn_decapsulate); | |
8359925b YK |
908 | } |
909 | ||
6fb32dde VN |
910 | struct ipv6_tel_txoption { |
911 | struct ipv6_txoptions ops; | |
912 | __u8 dst_opt[8]; | |
913 | }; | |
1da177e4 | 914 | |
6fb32dde VN |
915 | static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) |
916 | { | |
917 | memset(opt, 0, sizeof(struct ipv6_tel_txoption)); | |
1da177e4 | 918 | |
6fb32dde VN |
919 | opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; |
920 | opt->dst_opt[3] = 1; | |
921 | opt->dst_opt[4] = encap_limit; | |
922 | opt->dst_opt[5] = IPV6_TLV_PADN; | |
923 | opt->dst_opt[6] = 1; | |
1da177e4 | 924 | |
6fb32dde VN |
925 | opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; |
926 | opt->ops.opt_nflen = 8; | |
1da177e4 LT |
927 | } |
928 | ||
929 | /** | |
3144581c | 930 | * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own |
1da177e4 | 931 | * @t: the outgoing tunnel device |
1ab1457c | 932 | * @hdr: IPv6 header from the incoming packet |
1da177e4 LT |
933 | * |
934 | * Description: | |
1ab1457c | 935 | * Avoid trivial tunneling loop by checking that tunnel exit-point |
1da177e4 LT |
936 | * doesn't match source of incoming packet. |
937 | * | |
1ab1457c | 938 | * Return: |
1da177e4 LT |
939 | * 1 if conflict, |
940 | * 0 else | |
941 | **/ | |
942 | ||
92113bfd | 943 | static inline bool |
b71d1d42 | 944 | ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) |
1da177e4 LT |
945 | { |
946 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
947 | } | |
948 | ||
d5005140 SK |
949 | int ip6_tnl_xmit_ctl(struct ip6_tnl *t, |
950 | const struct in6_addr *laddr, | |
951 | const struct in6_addr *raddr) | |
09c6bbf0 | 952 | { |
c12b395a | 953 | struct __ip6_tnl_parm *p = &t->parms; |
09c6bbf0 | 954 | int ret = 0; |
0bd87628 | 955 | struct net *net = t->net; |
09c6bbf0 | 956 | |
d5005140 SK |
957 | if ((p->flags & IP6_TNL_F_CAP_XMIT) || |
958 | ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && | |
959 | (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) { | |
09c6bbf0 VN |
960 | struct net_device *ldev = NULL; |
961 | ||
f1a28eab | 962 | rcu_read_lock(); |
09c6bbf0 | 963 | if (p->link) |
f1a28eab | 964 | ldev = dev_get_by_index_rcu(net, p->link); |
09c6bbf0 | 965 | |
d5005140 | 966 | if (unlikely(!ipv6_chk_addr(net, laddr, ldev, 0))) |
f3213831 JP |
967 | pr_warn("%s xmit: Local address not yet configured!\n", |
968 | p->name); | |
d5005140 SK |
969 | else if (!ipv6_addr_is_multicast(raddr) && |
970 | unlikely(ipv6_chk_addr(net, raddr, NULL, 0))) | |
f3213831 JP |
971 | pr_warn("%s xmit: Routing loop! Remote address found on this node!\n", |
972 | p->name); | |
09c6bbf0 VN |
973 | else |
974 | ret = 1; | |
f1a28eab | 975 | rcu_read_unlock(); |
09c6bbf0 VN |
976 | } |
977 | return ret; | |
978 | } | |
c12b395a | 979 | EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl); |
980 | ||
1da177e4 | 981 | /** |
8eb30be0 | 982 | * ip6_tnl_xmit - encapsulate packet and send |
1da177e4 | 983 | * @skb: the outgoing socket buffer |
1ab1457c | 984 | * @dev: the outgoing tunnel device |
61ec2aec | 985 | * @dsfield: dscp code for outer header |
8eb30be0 | 986 | * @fl6: flow of tunneled packet |
61ec2aec YK |
987 | * @encap_limit: encapsulation limit |
988 | * @pmtu: Path MTU is stored if packet is too big | |
8eb30be0 | 989 | * @proto: next header value |
1da177e4 LT |
990 | * |
991 | * Description: | |
992 | * Build new header and do some sanity checks on the packet before sending | |
993 | * it. | |
994 | * | |
1ab1457c | 995 | * Return: |
c4d3efaf | 996 | * 0 on success |
61ec2aec YK |
997 | * -1 fail |
998 | * %-EMSGSIZE message too big. return mtu in this case. | |
1da177e4 LT |
999 | **/ |
1000 | ||
8eb30be0 TH |
1001 | int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield, |
1002 | struct flowi6 *fl6, int encap_limit, __u32 *pmtu, | |
1003 | __u8 proto) | |
1da177e4 | 1004 | { |
2941a486 | 1005 | struct ip6_tnl *t = netdev_priv(dev); |
0bd87628 | 1006 | struct net *net = t->net; |
3dca02af | 1007 | struct net_device_stats *stats = &t->dev->stats; |
0660e03f | 1008 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
6fb32dde | 1009 | struct ipv6_tel_txoption opt; |
d24f22f3 | 1010 | struct dst_entry *dst = NULL, *ndst = NULL; |
1da177e4 LT |
1011 | struct net_device *tdev; |
1012 | int mtu; | |
058214a4 TH |
1013 | unsigned int psh_hlen = sizeof(struct ipv6hdr) + t->encap_hlen; |
1014 | unsigned int max_headroom = psh_hlen; | |
61ec2aec | 1015 | int err = -1; |
1da177e4 | 1016 | |
ea3dc960 SK |
1017 | /* NBMA tunnel */ |
1018 | if (ipv6_addr_any(&t->parms.raddr)) { | |
1019 | struct in6_addr *addr6; | |
1020 | struct neighbour *neigh; | |
1021 | int addr_type; | |
1022 | ||
1023 | if (!skb_dst(skb)) | |
1024 | goto tx_err_link_failure; | |
1025 | ||
1026 | neigh = dst_neigh_lookup(skb_dst(skb), | |
1027 | &ipv6_hdr(skb)->daddr); | |
1028 | if (!neigh) | |
1029 | goto tx_err_link_failure; | |
1030 | ||
1031 | addr6 = (struct in6_addr *)&neigh->primary_key; | |
1032 | addr_type = ipv6_addr_type(addr6); | |
1033 | ||
1034 | if (addr_type == IPV6_ADDR_ANY) | |
1035 | addr6 = &ipv6_hdr(skb)->daddr; | |
1036 | ||
1037 | memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr)); | |
1038 | neigh_release(neigh); | |
1039 | } else if (!fl6->flowi6_mark) | |
607f725f | 1040 | dst = dst_cache_get(&t->dst_cache); |
d5005140 SK |
1041 | |
1042 | if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr)) | |
1043 | goto tx_err_link_failure; | |
1044 | ||
89b02126 | 1045 | if (!dst) { |
cdf3464e | 1046 | dst = ip6_route_output(net, NULL, fl6); |
1da177e4 | 1047 | |
cdf3464e | 1048 | if (dst->error) |
a57ebc90 | 1049 | goto tx_err_link_failure; |
cdf3464e MKL |
1050 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0); |
1051 | if (IS_ERR(dst)) { | |
1052 | err = PTR_ERR(dst); | |
1053 | dst = NULL; | |
452edd59 DM |
1054 | goto tx_err_link_failure; |
1055 | } | |
cdf3464e | 1056 | ndst = dst; |
a57ebc90 | 1057 | } |
1da177e4 LT |
1058 | |
1059 | tdev = dst->dev; | |
1060 | ||
1061 | if (tdev == dev) { | |
1062 | stats->collisions++; | |
e87cc472 JP |
1063 | net_warn_ratelimited("%s: Local routing loop detected!\n", |
1064 | t->parms.name); | |
1da177e4 LT |
1065 | goto tx_err_dst_release; |
1066 | } | |
058214a4 | 1067 | mtu = dst_mtu(dst) - psh_hlen; |
6fb32dde | 1068 | if (encap_limit >= 0) { |
1da177e4 LT |
1069 | max_headroom += 8; |
1070 | mtu -= 8; | |
1071 | } | |
1072 | if (mtu < IPV6_MIN_MTU) | |
1073 | mtu = IPV6_MIN_MTU; | |
adf30907 | 1074 | if (skb_dst(skb)) |
6700c270 | 1075 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); |
8eb30be0 | 1076 | if (skb->len > mtu && !skb_is_gso(skb)) { |
61ec2aec YK |
1077 | *pmtu = mtu; |
1078 | err = -EMSGSIZE; | |
1da177e4 LT |
1079 | goto tx_err_dst_release; |
1080 | } | |
1081 | ||
8eb30be0 TH |
1082 | if (t->err_count > 0) { |
1083 | if (time_before(jiffies, | |
1084 | t->err_time + IP6TUNNEL_ERR_TIMEO)) { | |
1085 | t->err_count--; | |
1086 | ||
1087 | dst_link_failure(skb); | |
1088 | } else { | |
1089 | t->err_count = 0; | |
1090 | } | |
1091 | } | |
1092 | ||
963a88b3 | 1093 | skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev))); |
0bd87628 | 1094 | |
1da177e4 LT |
1095 | /* |
1096 | * Okay, now see if we can stuff it in the buffer as-is. | |
1097 | */ | |
1098 | max_headroom += LL_RESERVED_SPACE(tdev); | |
1ab1457c | 1099 | |
cfbba49d PM |
1100 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
1101 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 | 1102 | struct sk_buff *new_skb; |
1ab1457c | 1103 | |
e5d08d71 IM |
1104 | new_skb = skb_realloc_headroom(skb, max_headroom); |
1105 | if (!new_skb) | |
1da177e4 LT |
1106 | goto tx_err_dst_release; |
1107 | ||
1108 | if (skb->sk) | |
1109 | skb_set_owner_w(new_skb, skb->sk); | |
9ff26449 | 1110 | consume_skb(skb); |
1da177e4 LT |
1111 | skb = new_skb; |
1112 | } | |
cdf3464e MKL |
1113 | |
1114 | if (!fl6->flowi6_mark && ndst) | |
607f725f | 1115 | dst_cache_set_ip6(&t->dst_cache, ndst, &fl6->saddr); |
cdf3464e MKL |
1116 | skb_dst_set(skb, dst); |
1117 | ||
6fb32dde VN |
1118 | if (encap_limit >= 0) { |
1119 | init_tel_txopt(&opt, encap_limit); | |
1120 | ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); | |
1121 | } | |
3d483058 | 1122 | |
058214a4 TH |
1123 | /* Calculate max headroom for all the headers and adjust |
1124 | * needed_headroom if necessary. | |
1125 | */ | |
8eb30be0 | 1126 | max_headroom = LL_RESERVED_SPACE(dst->dev) + sizeof(struct ipv6hdr) |
058214a4 | 1127 | + dst->header_len + t->hlen; |
8eb30be0 TH |
1128 | if (max_headroom > dev->needed_headroom) |
1129 | dev->needed_headroom = max_headroom; | |
1130 | ||
058214a4 TH |
1131 | err = ip6_tnl_encap(skb, t, &proto, fl6); |
1132 | if (err) | |
1133 | return err; | |
1134 | ||
e2d1bca7 ACM |
1135 | skb_push(skb, sizeof(struct ipv6hdr)); |
1136 | skb_reset_network_header(skb); | |
0660e03f | 1137 | ipv6h = ipv6_hdr(skb); |
cb1ce2ef | 1138 | ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), |
42240901 | 1139 | ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6)); |
1da177e4 LT |
1140 | ipv6h->hop_limit = t->parms.hop_limit; |
1141 | ipv6h->nexthdr = proto; | |
4e3fd7a0 AD |
1142 | ipv6h->saddr = fl6->saddr; |
1143 | ipv6h->daddr = fl6->daddr; | |
79b16aad | 1144 | ip6tunnel_xmit(NULL, skb, dev); |
1da177e4 LT |
1145 | return 0; |
1146 | tx_err_link_failure: | |
1147 | stats->tx_carrier_errors++; | |
1148 | dst_link_failure(skb); | |
1149 | tx_err_dst_release: | |
cdf3464e | 1150 | dst_release(dst); |
61ec2aec YK |
1151 | return err; |
1152 | } | |
8eb30be0 | 1153 | EXPORT_SYMBOL(ip6_tnl_xmit); |
61ec2aec | 1154 | |
c4d3efaf YK |
1155 | static inline int |
1156 | ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1157 | { | |
1158 | struct ip6_tnl *t = netdev_priv(dev); | |
b71d1d42 | 1159 | const struct iphdr *iph = ip_hdr(skb); |
c4d3efaf | 1160 | int encap_limit = -1; |
4c9483b2 | 1161 | struct flowi6 fl6; |
c4d3efaf YK |
1162 | __u8 dsfield; |
1163 | __u32 mtu; | |
acf722f7 | 1164 | u8 tproto; |
c4d3efaf YK |
1165 | int err; |
1166 | ||
5146d1f1 BH |
1167 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
1168 | ||
acf722f7 | 1169 | tproto = ACCESS_ONCE(t->parms.proto); |
d5005140 | 1170 | if (tproto != IPPROTO_IPIP && tproto != 0) |
c4d3efaf YK |
1171 | return -1; |
1172 | ||
1173 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1174 | encap_limit = t->parms.encap_limit; | |
1175 | ||
67ba4152 | 1176 | memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); |
c4d3efaf YK |
1177 | |
1178 | dsfield = ipv4_get_dsfield(iph); | |
1179 | ||
d24f22f3 | 1180 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
4c9483b2 | 1181 | fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) |
b77f2fa6 | 1182 | & IPV6_TCLASS_MASK; |
d24f22f3 ED |
1183 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
1184 | fl6.flowi6_mark = skb->mark; | |
c4d3efaf | 1185 | |
b8921ca8 TH |
1186 | if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6)) |
1187 | return -1; | |
1188 | ||
1189 | skb_set_inner_ipproto(skb, IPPROTO_IPIP); | |
1190 | ||
8eb30be0 TH |
1191 | err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, |
1192 | IPPROTO_IPIP); | |
c4d3efaf YK |
1193 | if (err != 0) { |
1194 | /* XXX: send ICMP error even if DF is not set. */ | |
1195 | if (err == -EMSGSIZE) | |
1196 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
1197 | htonl(mtu)); | |
1198 | return -1; | |
1199 | } | |
1200 | ||
1201 | return 0; | |
1202 | } | |
1203 | ||
61ec2aec YK |
1204 | static inline int |
1205 | ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1206 | { | |
1207 | struct ip6_tnl *t = netdev_priv(dev); | |
0660e03f | 1208 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
61ec2aec YK |
1209 | int encap_limit = -1; |
1210 | __u16 offset; | |
4c9483b2 | 1211 | struct flowi6 fl6; |
61ec2aec YK |
1212 | __u8 dsfield; |
1213 | __u32 mtu; | |
acf722f7 | 1214 | u8 tproto; |
61ec2aec YK |
1215 | int err; |
1216 | ||
acf722f7 AA |
1217 | tproto = ACCESS_ONCE(t->parms.proto); |
1218 | if ((tproto != IPPROTO_IPV6 && tproto != 0) || | |
d5005140 | 1219 | ip6_tnl_addr_conflict(t, ipv6h)) |
61ec2aec YK |
1220 | return -1; |
1221 | ||
c12b395a | 1222 | offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); |
d56f90a7 | 1223 | if (offset > 0) { |
61ec2aec | 1224 | struct ipv6_tlv_tnl_enc_lim *tel; |
d56f90a7 | 1225 | tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; |
61ec2aec YK |
1226 | if (tel->encap_limit == 0) { |
1227 | icmpv6_send(skb, ICMPV6_PARAMPROB, | |
3ffe533c | 1228 | ICMPV6_HDR_FIELD, offset + 2); |
61ec2aec YK |
1229 | return -1; |
1230 | } | |
1231 | encap_limit = tel->encap_limit - 1; | |
1232 | } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1233 | encap_limit = t->parms.encap_limit; | |
1234 | ||
67ba4152 | 1235 | memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); |
61ec2aec YK |
1236 | |
1237 | dsfield = ipv6_get_dsfield(ipv6h); | |
d24f22f3 | 1238 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
4c9483b2 | 1239 | fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); |
d24f22f3 | 1240 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) |
3308de2b | 1241 | fl6.flowlabel |= ip6_flowlabel(ipv6h); |
d24f22f3 ED |
1242 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
1243 | fl6.flowi6_mark = skb->mark; | |
61ec2aec | 1244 | |
815d22e5 TH |
1245 | if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6)) |
1246 | return -1; | |
1247 | ||
1248 | skb_set_inner_ipproto(skb, IPPROTO_IPV6); | |
1249 | ||
8eb30be0 TH |
1250 | err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, |
1251 | IPPROTO_IPV6); | |
61ec2aec YK |
1252 | if (err != 0) { |
1253 | if (err == -EMSGSIZE) | |
3ffe533c | 1254 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
61ec2aec YK |
1255 | return -1; |
1256 | } | |
1257 | ||
1258 | return 0; | |
1259 | } | |
1260 | ||
6fef4c0c | 1261 | static netdev_tx_t |
8eb30be0 | 1262 | ip6_tnl_start_xmit(struct sk_buff *skb, struct net_device *dev) |
61ec2aec YK |
1263 | { |
1264 | struct ip6_tnl *t = netdev_priv(dev); | |
3dca02af | 1265 | struct net_device_stats *stats = &t->dev->stats; |
61ec2aec YK |
1266 | int ret; |
1267 | ||
61ec2aec | 1268 | switch (skb->protocol) { |
60678040 | 1269 | case htons(ETH_P_IP): |
c4d3efaf YK |
1270 | ret = ip4ip6_tnl_xmit(skb, dev); |
1271 | break; | |
60678040 | 1272 | case htons(ETH_P_IPV6): |
61ec2aec YK |
1273 | ret = ip6ip6_tnl_xmit(skb, dev); |
1274 | break; | |
1275 | default: | |
1276 | goto tx_err; | |
1277 | } | |
1278 | ||
1279 | if (ret < 0) | |
1280 | goto tx_err; | |
1281 | ||
6ed10654 | 1282 | return NETDEV_TX_OK; |
61ec2aec | 1283 | |
1da177e4 LT |
1284 | tx_err: |
1285 | stats->tx_errors++; | |
1286 | stats->tx_dropped++; | |
1287 | kfree_skb(skb); | |
6ed10654 | 1288 | return NETDEV_TX_OK; |
1da177e4 LT |
1289 | } |
1290 | ||
3144581c | 1291 | static void ip6_tnl_link_config(struct ip6_tnl *t) |
1da177e4 LT |
1292 | { |
1293 | struct net_device *dev = t->dev; | |
c12b395a | 1294 | struct __ip6_tnl_parm *p = &t->parms; |
4c9483b2 | 1295 | struct flowi6 *fl6 = &t->fl.u.ip6; |
058214a4 | 1296 | int t_hlen; |
1da177e4 | 1297 | |
3a6d54c5 JP |
1298 | memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); |
1299 | memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
1da177e4 LT |
1300 | |
1301 | /* Set up flowi template */ | |
4e3fd7a0 AD |
1302 | fl6->saddr = p->laddr; |
1303 | fl6->daddr = p->raddr; | |
4c9483b2 DM |
1304 | fl6->flowi6_oif = p->link; |
1305 | fl6->flowlabel = 0; | |
1da177e4 LT |
1306 | |
1307 | if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) | |
4c9483b2 | 1308 | fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; |
1da177e4 | 1309 | if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) |
4c9483b2 | 1310 | fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; |
1da177e4 | 1311 | |
d0087b29 VN |
1312 | p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); |
1313 | p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); | |
1da177e4 LT |
1314 | |
1315 | if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) | |
1316 | dev->flags |= IFF_POINTOPOINT; | |
1317 | else | |
1318 | dev->flags &= ~IFF_POINTOPOINT; | |
1319 | ||
058214a4 TH |
1320 | t->tun_hlen = 0; |
1321 | t->hlen = t->encap_hlen + t->tun_hlen; | |
1322 | t_hlen = t->hlen + sizeof(struct ipv6hdr); | |
1323 | ||
1da177e4 | 1324 | if (p->flags & IP6_TNL_F_CAP_XMIT) { |
305d4b3c VN |
1325 | int strict = (ipv6_addr_type(&p->raddr) & |
1326 | (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); | |
1327 | ||
0bd87628 | 1328 | struct rt6_info *rt = rt6_lookup(t->net, |
2f7f54b7 | 1329 | &p->raddr, &p->laddr, |
305d4b3c | 1330 | p->link, strict); |
1da177e4 | 1331 | |
63159f29 | 1332 | if (!rt) |
1da177e4 LT |
1333 | return; |
1334 | ||
d1918542 DM |
1335 | if (rt->dst.dev) { |
1336 | dev->hard_header_len = rt->dst.dev->hard_header_len + | |
058214a4 | 1337 | t_hlen; |
1da177e4 | 1338 | |
058214a4 | 1339 | dev->mtu = rt->dst.dev->mtu - t_hlen; |
381601e5 | 1340 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
67ba4152 | 1341 | dev->mtu -= 8; |
1da177e4 LT |
1342 | |
1343 | if (dev->mtu < IPV6_MIN_MTU) | |
1344 | dev->mtu = IPV6_MIN_MTU; | |
1345 | } | |
94e187c0 | 1346 | ip6_rt_put(rt); |
1da177e4 LT |
1347 | } |
1348 | } | |
1349 | ||
1350 | /** | |
3144581c | 1351 | * ip6_tnl_change - update the tunnel parameters |
1da177e4 LT |
1352 | * @t: tunnel to be changed |
1353 | * @p: tunnel configuration parameters | |
1da177e4 LT |
1354 | * |
1355 | * Description: | |
3144581c | 1356 | * ip6_tnl_change() updates the tunnel parameters |
1da177e4 LT |
1357 | **/ |
1358 | ||
1359 | static int | |
c12b395a | 1360 | ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) |
1da177e4 | 1361 | { |
4e3fd7a0 AD |
1362 | t->parms.laddr = p->laddr; |
1363 | t->parms.raddr = p->raddr; | |
1da177e4 LT |
1364 | t->parms.flags = p->flags; |
1365 | t->parms.hop_limit = p->hop_limit; | |
1366 | t->parms.encap_limit = p->encap_limit; | |
1367 | t->parms.flowinfo = p->flowinfo; | |
8181b8c1 | 1368 | t->parms.link = p->link; |
502b0935 | 1369 | t->parms.proto = p->proto; |
607f725f | 1370 | dst_cache_reset(&t->dst_cache); |
3144581c | 1371 | ip6_tnl_link_config(t); |
1da177e4 LT |
1372 | return 0; |
1373 | } | |
1374 | ||
0b112457 ND |
1375 | static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) |
1376 | { | |
0bd87628 | 1377 | struct net *net = t->net; |
0b112457 ND |
1378 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1379 | int err; | |
1380 | ||
1381 | ip6_tnl_unlink(ip6n, t); | |
1382 | synchronize_net(); | |
1383 | err = ip6_tnl_change(t, p); | |
1384 | ip6_tnl_link(ip6n, t); | |
1385 | netdev_state_change(t->dev); | |
1386 | return err; | |
1387 | } | |
1388 | ||
acf722f7 AA |
1389 | static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) |
1390 | { | |
1391 | /* for default tnl0 device allow to change only the proto */ | |
1392 | t->parms.proto = p->proto; | |
1393 | netdev_state_change(t->dev); | |
1394 | return 0; | |
1395 | } | |
1396 | ||
c12b395a | 1397 | static void |
1398 | ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u) | |
1399 | { | |
1400 | p->laddr = u->laddr; | |
1401 | p->raddr = u->raddr; | |
1402 | p->flags = u->flags; | |
1403 | p->hop_limit = u->hop_limit; | |
1404 | p->encap_limit = u->encap_limit; | |
1405 | p->flowinfo = u->flowinfo; | |
1406 | p->link = u->link; | |
1407 | p->proto = u->proto; | |
1408 | memcpy(p->name, u->name, sizeof(u->name)); | |
1409 | } | |
1410 | ||
1411 | static void | |
1412 | ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p) | |
1413 | { | |
1414 | u->laddr = p->laddr; | |
1415 | u->raddr = p->raddr; | |
1416 | u->flags = p->flags; | |
1417 | u->hop_limit = p->hop_limit; | |
1418 | u->encap_limit = p->encap_limit; | |
1419 | u->flowinfo = p->flowinfo; | |
1420 | u->link = p->link; | |
1421 | u->proto = p->proto; | |
1422 | memcpy(u->name, p->name, sizeof(u->name)); | |
1423 | } | |
1424 | ||
1da177e4 | 1425 | /** |
3144581c | 1426 | * ip6_tnl_ioctl - configure ipv6 tunnels from userspace |
1da177e4 LT |
1427 | * @dev: virtual device associated with tunnel |
1428 | * @ifr: parameters passed from userspace | |
1429 | * @cmd: command to be performed | |
1430 | * | |
1431 | * Description: | |
3144581c | 1432 | * ip6_tnl_ioctl() is used for managing IPv6 tunnels |
1ab1457c | 1433 | * from userspace. |
1da177e4 LT |
1434 | * |
1435 | * The possible commands are the following: | |
1436 | * %SIOCGETTUNNEL: get tunnel parameters for device | |
1437 | * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters | |
1438 | * %SIOCCHGTUNNEL: change tunnel parameters to those given | |
1439 | * %SIOCDELTUNNEL: delete tunnel | |
1440 | * | |
1ab1457c | 1441 | * The fallback device "ip6tnl0", created during module |
1da177e4 LT |
1442 | * initialization, can be used for creating other tunnel devices. |
1443 | * | |
1444 | * Return: | |
1445 | * 0 on success, | |
1446 | * %-EFAULT if unable to copy data to or from userspace, | |
1447 | * %-EPERM if current process hasn't %CAP_NET_ADMIN set | |
1448 | * %-EINVAL if passed tunnel parameters are invalid, | |
1449 | * %-EEXIST if changing a tunnel's parameters would cause a conflict | |
1450 | * %-ENODEV if attempting to change or delete a nonexisting device | |
1451 | **/ | |
1452 | ||
1453 | static int | |
3144581c | 1454 | ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
1da177e4 LT |
1455 | { |
1456 | int err = 0; | |
1da177e4 | 1457 | struct ip6_tnl_parm p; |
c12b395a | 1458 | struct __ip6_tnl_parm p1; |
74462f0d ND |
1459 | struct ip6_tnl *t = netdev_priv(dev); |
1460 | struct net *net = t->net; | |
2dd02c89 | 1461 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
1da177e4 | 1462 | |
0d3c703a TH |
1463 | memset(&p1, 0, sizeof(p1)); |
1464 | ||
1da177e4 LT |
1465 | switch (cmd) { |
1466 | case SIOCGETTUNNEL: | |
15820e12 | 1467 | if (dev == ip6n->fb_tnl_dev) { |
67ba4152 | 1468 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
1da177e4 LT |
1469 | err = -EFAULT; |
1470 | break; | |
1471 | } | |
c12b395a | 1472 | ip6_tnl_parm_from_user(&p1, &p); |
1473 | t = ip6_tnl_locate(net, &p1, 0); | |
37355565 | 1474 | if (IS_ERR(t)) |
74462f0d | 1475 | t = netdev_priv(dev); |
5ef5d6c5 DC |
1476 | } else { |
1477 | memset(&p, 0, sizeof(p)); | |
567131a7 | 1478 | } |
c12b395a | 1479 | ip6_tnl_parm_to_user(&p, &t->parms); |
67ba4152 | 1480 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) { |
1da177e4 LT |
1481 | err = -EFAULT; |
1482 | } | |
1483 | break; | |
1484 | case SIOCADDTUNNEL: | |
1485 | case SIOCCHGTUNNEL: | |
1486 | err = -EPERM; | |
af31f412 | 1487 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 1488 | break; |
567131a7 | 1489 | err = -EFAULT; |
67ba4152 | 1490 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
1da177e4 | 1491 | break; |
567131a7 | 1492 | err = -EINVAL; |
502b0935 YK |
1493 | if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && |
1494 | p.proto != 0) | |
1da177e4 | 1495 | break; |
c12b395a | 1496 | ip6_tnl_parm_from_user(&p1, &p); |
1497 | t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL); | |
acf722f7 | 1498 | if (cmd == SIOCCHGTUNNEL) { |
37355565 | 1499 | if (!IS_ERR(t)) { |
567131a7 VN |
1500 | if (t->dev != dev) { |
1501 | err = -EEXIST; | |
1502 | break; | |
1503 | } | |
1504 | } else | |
1505 | t = netdev_priv(dev); | |
acf722f7 AA |
1506 | if (dev == ip6n->fb_tnl_dev) |
1507 | err = ip6_tnl0_update(t, &p1); | |
1508 | else | |
1509 | err = ip6_tnl_update(t, &p1); | |
1da177e4 | 1510 | } |
37355565 | 1511 | if (!IS_ERR(t)) { |
1da177e4 | 1512 | err = 0; |
c12b395a | 1513 | ip6_tnl_parm_to_user(&p, &t->parms); |
1514 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
567131a7 VN |
1515 | err = -EFAULT; |
1516 | ||
37355565 ND |
1517 | } else { |
1518 | err = PTR_ERR(t); | |
1519 | } | |
1da177e4 LT |
1520 | break; |
1521 | case SIOCDELTUNNEL: | |
1522 | err = -EPERM; | |
af31f412 | 1523 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1524 | break; |
1525 | ||
15820e12 | 1526 | if (dev == ip6n->fb_tnl_dev) { |
567131a7 | 1527 | err = -EFAULT; |
67ba4152 | 1528 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
1da177e4 | 1529 | break; |
567131a7 | 1530 | err = -ENOENT; |
c12b395a | 1531 | ip6_tnl_parm_from_user(&p1, &p); |
1532 | t = ip6_tnl_locate(net, &p1, 0); | |
37355565 | 1533 | if (IS_ERR(t)) |
1da177e4 | 1534 | break; |
567131a7 | 1535 | err = -EPERM; |
15820e12 | 1536 | if (t->dev == ip6n->fb_tnl_dev) |
1da177e4 | 1537 | break; |
567131a7 | 1538 | dev = t->dev; |
1da177e4 | 1539 | } |
22f8cde5 SH |
1540 | err = 0; |
1541 | unregister_netdevice(dev); | |
1da177e4 LT |
1542 | break; |
1543 | default: | |
1544 | err = -EINVAL; | |
1545 | } | |
1546 | return err; | |
1547 | } | |
1548 | ||
1da177e4 | 1549 | /** |
3144581c | 1550 | * ip6_tnl_change_mtu - change mtu manually for tunnel device |
1da177e4 LT |
1551 | * @dev: virtual device associated with tunnel |
1552 | * @new_mtu: the new mtu | |
1553 | * | |
1554 | * Return: | |
1555 | * 0 on success, | |
1556 | * %-EINVAL if mtu too small | |
1557 | **/ | |
1558 | ||
79ecb90e | 1559 | int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) |
1da177e4 | 1560 | { |
582442d6 OG |
1561 | struct ip6_tnl *tnl = netdev_priv(dev); |
1562 | ||
1563 | if (tnl->parms.proto == IPPROTO_IPIP) { | |
1564 | if (new_mtu < 68) | |
1565 | return -EINVAL; | |
1566 | } else { | |
1567 | if (new_mtu < IPV6_MIN_MTU) | |
1568 | return -EINVAL; | |
1da177e4 | 1569 | } |
582442d6 OG |
1570 | if (new_mtu > 0xFFF8 - dev->hard_header_len) |
1571 | return -EINVAL; | |
1da177e4 LT |
1572 | dev->mtu = new_mtu; |
1573 | return 0; | |
1574 | } | |
79ecb90e | 1575 | EXPORT_SYMBOL(ip6_tnl_change_mtu); |
1da177e4 | 1576 | |
ecf2c06a ND |
1577 | int ip6_tnl_get_iflink(const struct net_device *dev) |
1578 | { | |
1579 | struct ip6_tnl *t = netdev_priv(dev); | |
1580 | ||
1581 | return t->parms.link; | |
1582 | } | |
1583 | EXPORT_SYMBOL(ip6_tnl_get_iflink); | |
1326c3d5 | 1584 | |
058214a4 TH |
1585 | int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops, |
1586 | unsigned int num) | |
1587 | { | |
1588 | if (num >= MAX_IPTUN_ENCAP_OPS) | |
1589 | return -ERANGE; | |
1590 | ||
1591 | return !cmpxchg((const struct ip6_tnl_encap_ops **) | |
1592 | &ip6tun_encaps[num], | |
1593 | NULL, ops) ? 0 : -1; | |
1594 | } | |
1595 | EXPORT_SYMBOL(ip6_tnl_encap_add_ops); | |
1596 | ||
1597 | int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops, | |
1598 | unsigned int num) | |
1599 | { | |
1600 | int ret; | |
1601 | ||
1602 | if (num >= MAX_IPTUN_ENCAP_OPS) | |
1603 | return -ERANGE; | |
1604 | ||
1605 | ret = (cmpxchg((const struct ip6_tnl_encap_ops **) | |
1606 | &ip6tun_encaps[num], | |
1607 | ops, NULL) == ops) ? 0 : -1; | |
1608 | ||
1609 | synchronize_net(); | |
1610 | ||
1611 | return ret; | |
1612 | } | |
1613 | EXPORT_SYMBOL(ip6_tnl_encap_del_ops); | |
1614 | ||
1615 | int ip6_tnl_encap_setup(struct ip6_tnl *t, | |
1616 | struct ip_tunnel_encap *ipencap) | |
1617 | { | |
1618 | int hlen; | |
1619 | ||
1620 | memset(&t->encap, 0, sizeof(t->encap)); | |
1621 | ||
1622 | hlen = ip6_encap_hlen(ipencap); | |
1623 | if (hlen < 0) | |
1624 | return hlen; | |
1625 | ||
1626 | t->encap.type = ipencap->type; | |
1627 | t->encap.sport = ipencap->sport; | |
1628 | t->encap.dport = ipencap->dport; | |
1629 | t->encap.flags = ipencap->flags; | |
1630 | ||
1631 | t->encap_hlen = hlen; | |
1632 | t->hlen = t->encap_hlen + t->tun_hlen; | |
1633 | ||
1634 | return 0; | |
1635 | } | |
1636 | EXPORT_SYMBOL_GPL(ip6_tnl_encap_setup); | |
1637 | ||
1326c3d5 | 1638 | static const struct net_device_ops ip6_tnl_netdev_ops = { |
6c6151da | 1639 | .ndo_init = ip6_tnl_dev_init, |
8560f226 | 1640 | .ndo_uninit = ip6_tnl_dev_uninit, |
8eb30be0 | 1641 | .ndo_start_xmit = ip6_tnl_start_xmit, |
8560f226 | 1642 | .ndo_do_ioctl = ip6_tnl_ioctl, |
1326c3d5 | 1643 | .ndo_change_mtu = ip6_tnl_change_mtu, |
8560f226 | 1644 | .ndo_get_stats = ip6_get_stats, |
ecf2c06a | 1645 | .ndo_get_iflink = ip6_tnl_get_iflink, |
1326c3d5 SH |
1646 | }; |
1647 | ||
51c052d4 TH |
1648 | #define IPXIPX_FEATURES (NETIF_F_SG | \ |
1649 | NETIF_F_FRAGLIST | \ | |
1650 | NETIF_F_HIGHDMA | \ | |
1651 | NETIF_F_GSO_SOFTWARE | \ | |
1652 | NETIF_F_HW_CSUM) | |
8560f226 | 1653 | |
1da177e4 | 1654 | /** |
3144581c | 1655 | * ip6_tnl_dev_setup - setup virtual tunnel device |
1da177e4 LT |
1656 | * @dev: virtual device associated with tunnel |
1657 | * | |
1658 | * Description: | |
1659 | * Initialize function pointers and device parameters | |
1660 | **/ | |
1661 | ||
3144581c | 1662 | static void ip6_tnl_dev_setup(struct net_device *dev) |
1da177e4 | 1663 | { |
1326c3d5 | 1664 | dev->netdev_ops = &ip6_tnl_netdev_ops; |
8560f226 | 1665 | dev->destructor = ip6_dev_free; |
1da177e4 LT |
1666 | |
1667 | dev->type = ARPHRD_TUNNEL6; | |
1da177e4 LT |
1668 | dev->flags |= IFF_NOARP; |
1669 | dev->addr_len = sizeof(struct in6_addr); | |
058214a4 | 1670 | dev->features |= NETIF_F_LLTX; |
02875878 | 1671 | netif_keep_dst(dev); |
51c052d4 TH |
1672 | |
1673 | dev->features |= IPXIPX_FEATURES; | |
1674 | dev->hw_features |= IPXIPX_FEATURES; | |
1675 | ||
e837735e ND |
1676 | /* This perm addr will be used as interface identifier by IPv6 */ |
1677 | dev->addr_assign_type = NET_ADDR_RANDOM; | |
1678 | eth_random_addr(dev->perm_addr); | |
1da177e4 LT |
1679 | } |
1680 | ||
1681 | ||
1682 | /** | |
3144581c | 1683 | * ip6_tnl_dev_init_gen - general initializer for all tunnel devices |
1da177e4 LT |
1684 | * @dev: virtual device associated with tunnel |
1685 | **/ | |
1686 | ||
8560f226 | 1687 | static inline int |
3144581c | 1688 | ip6_tnl_dev_init_gen(struct net_device *dev) |
1da177e4 | 1689 | { |
2941a486 | 1690 | struct ip6_tnl *t = netdev_priv(dev); |
cdf3464e | 1691 | int ret; |
058214a4 | 1692 | int t_hlen; |
8560f226 | 1693 | |
1da177e4 | 1694 | t->dev = dev; |
0bd87628 | 1695 | t->net = dev_net(dev); |
1c213bd2 | 1696 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
8560f226 ED |
1697 | if (!dev->tstats) |
1698 | return -ENOMEM; | |
cdf3464e | 1699 | |
607f725f | 1700 | ret = dst_cache_init(&t->dst_cache, GFP_KERNEL); |
0d3c703a TH |
1701 | if (ret) |
1702 | goto free_stats; | |
1703 | ||
1704 | ret = gro_cells_init(&t->gro_cells, dev); | |
1705 | if (ret) | |
1706 | goto destroy_dst; | |
cdf3464e | 1707 | |
79ecb90e | 1708 | t->tun_hlen = 0; |
058214a4 TH |
1709 | t->hlen = t->encap_hlen + t->tun_hlen; |
1710 | t_hlen = t->hlen + sizeof(struct ipv6hdr); | |
1711 | ||
1712 | dev->type = ARPHRD_TUNNEL6; | |
1713 | dev->hard_header_len = LL_MAX_HEADER + t_hlen; | |
1714 | dev->mtu = ETH_DATA_LEN - t_hlen; | |
1715 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1716 | dev->mtu -= 8; | |
79ecb90e | 1717 | |
8560f226 | 1718 | return 0; |
0d3c703a TH |
1719 | |
1720 | destroy_dst: | |
1721 | dst_cache_destroy(&t->dst_cache); | |
1722 | free_stats: | |
1723 | free_percpu(dev->tstats); | |
1724 | dev->tstats = NULL; | |
1725 | ||
1726 | return ret; | |
1da177e4 LT |
1727 | } |
1728 | ||
1729 | /** | |
3144581c | 1730 | * ip6_tnl_dev_init - initializer for all non fallback tunnel devices |
1da177e4 LT |
1731 | * @dev: virtual device associated with tunnel |
1732 | **/ | |
1733 | ||
8560f226 | 1734 | static int ip6_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1735 | { |
2941a486 | 1736 | struct ip6_tnl *t = netdev_priv(dev); |
8560f226 ED |
1737 | int err = ip6_tnl_dev_init_gen(dev); |
1738 | ||
1739 | if (err) | |
1740 | return err; | |
3144581c | 1741 | ip6_tnl_link_config(t); |
8560f226 | 1742 | return 0; |
1da177e4 LT |
1743 | } |
1744 | ||
1745 | /** | |
3144581c | 1746 | * ip6_fb_tnl_dev_init - initializer for fallback tunnel device |
1da177e4 LT |
1747 | * @dev: fallback device |
1748 | * | |
1749 | * Return: 0 | |
1750 | **/ | |
1751 | ||
8560f226 | 1752 | static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev) |
1da177e4 | 1753 | { |
2941a486 | 1754 | struct ip6_tnl *t = netdev_priv(dev); |
3e6c9fb5 PE |
1755 | struct net *net = dev_net(dev); |
1756 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1757 | ||
502b0935 | 1758 | t->parms.proto = IPPROTO_IPV6; |
1da177e4 | 1759 | dev_hold(dev); |
d0087b29 | 1760 | |
cf778b00 | 1761 | rcu_assign_pointer(ip6n->tnls_wc[0], t); |
8560f226 | 1762 | return 0; |
1da177e4 LT |
1763 | } |
1764 | ||
0b112457 ND |
1765 | static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[]) |
1766 | { | |
1767 | u8 proto; | |
1768 | ||
c8965932 | 1769 | if (!data || !data[IFLA_IPTUN_PROTO]) |
0b112457 ND |
1770 | return 0; |
1771 | ||
1772 | proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1773 | if (proto != IPPROTO_IPV6 && | |
1774 | proto != IPPROTO_IPIP && | |
1775 | proto != 0) | |
1776 | return -EINVAL; | |
1777 | ||
1778 | return 0; | |
1779 | } | |
1780 | ||
1781 | static void ip6_tnl_netlink_parms(struct nlattr *data[], | |
1782 | struct __ip6_tnl_parm *parms) | |
1783 | { | |
1784 | memset(parms, 0, sizeof(*parms)); | |
1785 | ||
1786 | if (!data) | |
1787 | return; | |
1788 | ||
1789 | if (data[IFLA_IPTUN_LINK]) | |
1790 | parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); | |
1791 | ||
1792 | if (data[IFLA_IPTUN_LOCAL]) | |
67b61f6c | 1793 | parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]); |
0b112457 ND |
1794 | |
1795 | if (data[IFLA_IPTUN_REMOTE]) | |
67b61f6c | 1796 | parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]); |
0b112457 ND |
1797 | |
1798 | if (data[IFLA_IPTUN_TTL]) | |
1799 | parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]); | |
1800 | ||
1801 | if (data[IFLA_IPTUN_ENCAP_LIMIT]) | |
1802 | parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]); | |
1803 | ||
1804 | if (data[IFLA_IPTUN_FLOWINFO]) | |
1ff05fb7 | 1805 | parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]); |
0b112457 ND |
1806 | |
1807 | if (data[IFLA_IPTUN_FLAGS]) | |
1808 | parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]); | |
1809 | ||
1810 | if (data[IFLA_IPTUN_PROTO]) | |
1811 | parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1812 | } | |
1813 | ||
b3a27b51 TH |
1814 | static bool ip6_tnl_netlink_encap_parms(struct nlattr *data[], |
1815 | struct ip_tunnel_encap *ipencap) | |
1816 | { | |
1817 | bool ret = false; | |
1818 | ||
1819 | memset(ipencap, 0, sizeof(*ipencap)); | |
1820 | ||
1821 | if (!data) | |
1822 | return ret; | |
1823 | ||
1824 | if (data[IFLA_IPTUN_ENCAP_TYPE]) { | |
1825 | ret = true; | |
1826 | ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); | |
1827 | } | |
1828 | ||
1829 | if (data[IFLA_IPTUN_ENCAP_FLAGS]) { | |
1830 | ret = true; | |
1831 | ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); | |
1832 | } | |
1833 | ||
1834 | if (data[IFLA_IPTUN_ENCAP_SPORT]) { | |
1835 | ret = true; | |
1836 | ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); | |
1837 | } | |
1838 | ||
1839 | if (data[IFLA_IPTUN_ENCAP_DPORT]) { | |
1840 | ret = true; | |
1841 | ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); | |
1842 | } | |
1843 | ||
1844 | return ret; | |
1845 | } | |
1846 | ||
0b112457 ND |
1847 | static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev, |
1848 | struct nlattr *tb[], struct nlattr *data[]) | |
1849 | { | |
1850 | struct net *net = dev_net(dev); | |
37355565 | 1851 | struct ip6_tnl *nt, *t; |
b3a27b51 | 1852 | struct ip_tunnel_encap ipencap; |
0b112457 ND |
1853 | |
1854 | nt = netdev_priv(dev); | |
b3a27b51 TH |
1855 | |
1856 | if (ip6_tnl_netlink_encap_parms(data, &ipencap)) { | |
1857 | int err = ip6_tnl_encap_setup(nt, &ipencap); | |
1858 | ||
1859 | if (err < 0) | |
1860 | return err; | |
1861 | } | |
1862 | ||
0b112457 ND |
1863 | ip6_tnl_netlink_parms(data, &nt->parms); |
1864 | ||
37355565 ND |
1865 | t = ip6_tnl_locate(net, &nt->parms, 0); |
1866 | if (!IS_ERR(t)) | |
0b112457 ND |
1867 | return -EEXIST; |
1868 | ||
1869 | return ip6_tnl_create2(dev); | |
1870 | } | |
1871 | ||
1872 | static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[], | |
1873 | struct nlattr *data[]) | |
1874 | { | |
0bd87628 | 1875 | struct ip6_tnl *t = netdev_priv(dev); |
0b112457 | 1876 | struct __ip6_tnl_parm p; |
0bd87628 | 1877 | struct net *net = t->net; |
0b112457 | 1878 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
b3a27b51 | 1879 | struct ip_tunnel_encap ipencap; |
0b112457 ND |
1880 | |
1881 | if (dev == ip6n->fb_tnl_dev) | |
1882 | return -EINVAL; | |
1883 | ||
b3a27b51 TH |
1884 | if (ip6_tnl_netlink_encap_parms(data, &ipencap)) { |
1885 | int err = ip6_tnl_encap_setup(t, &ipencap); | |
1886 | ||
1887 | if (err < 0) | |
1888 | return err; | |
1889 | } | |
0b112457 ND |
1890 | ip6_tnl_netlink_parms(data, &p); |
1891 | ||
1892 | t = ip6_tnl_locate(net, &p, 0); | |
37355565 | 1893 | if (!IS_ERR(t)) { |
0b112457 ND |
1894 | if (t->dev != dev) |
1895 | return -EEXIST; | |
1896 | } else | |
1897 | t = netdev_priv(dev); | |
1898 | ||
1899 | return ip6_tnl_update(t, &p); | |
1900 | } | |
1901 | ||
1e9f3d6f ND |
1902 | static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head) |
1903 | { | |
1904 | struct net *net = dev_net(dev); | |
1905 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1906 | ||
1907 | if (dev != ip6n->fb_tnl_dev) | |
1908 | unregister_netdevice_queue(dev, head); | |
1909 | } | |
1910 | ||
b58d731a | 1911 | static size_t ip6_tnl_get_size(const struct net_device *dev) |
c075b130 ND |
1912 | { |
1913 | return | |
1914 | /* IFLA_IPTUN_LINK */ | |
1915 | nla_total_size(4) + | |
1916 | /* IFLA_IPTUN_LOCAL */ | |
1917 | nla_total_size(sizeof(struct in6_addr)) + | |
1918 | /* IFLA_IPTUN_REMOTE */ | |
1919 | nla_total_size(sizeof(struct in6_addr)) + | |
1920 | /* IFLA_IPTUN_TTL */ | |
1921 | nla_total_size(1) + | |
1922 | /* IFLA_IPTUN_ENCAP_LIMIT */ | |
1923 | nla_total_size(1) + | |
1924 | /* IFLA_IPTUN_FLOWINFO */ | |
1925 | nla_total_size(4) + | |
1926 | /* IFLA_IPTUN_FLAGS */ | |
1927 | nla_total_size(4) + | |
cfa323b6 ND |
1928 | /* IFLA_IPTUN_PROTO */ |
1929 | nla_total_size(1) + | |
b3a27b51 TH |
1930 | /* IFLA_IPTUN_ENCAP_TYPE */ |
1931 | nla_total_size(2) + | |
1932 | /* IFLA_IPTUN_ENCAP_FLAGS */ | |
1933 | nla_total_size(2) + | |
1934 | /* IFLA_IPTUN_ENCAP_SPORT */ | |
1935 | nla_total_size(2) + | |
1936 | /* IFLA_IPTUN_ENCAP_DPORT */ | |
1937 | nla_total_size(2) + | |
c075b130 ND |
1938 | 0; |
1939 | } | |
1940 | ||
b58d731a | 1941 | static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev) |
c075b130 ND |
1942 | { |
1943 | struct ip6_tnl *tunnel = netdev_priv(dev); | |
1944 | struct __ip6_tnl_parm *parm = &tunnel->parms; | |
1945 | ||
1946 | if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || | |
930345ea JB |
1947 | nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) || |
1948 | nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) || | |
c075b130 ND |
1949 | nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) || |
1950 | nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) || | |
1951 | nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) || | |
cfa323b6 ND |
1952 | nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) || |
1953 | nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto)) | |
c075b130 | 1954 | goto nla_put_failure; |
b3a27b51 TH |
1955 | |
1956 | if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, | |
1957 | tunnel->encap.type) || | |
1958 | nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, | |
1959 | tunnel->encap.sport) || | |
1960 | nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, | |
1961 | tunnel->encap.dport) || | |
1962 | nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, | |
1963 | tunnel->encap.flags)) | |
1964 | goto nla_put_failure; | |
1965 | ||
c075b130 ND |
1966 | return 0; |
1967 | ||
1968 | nla_put_failure: | |
1969 | return -EMSGSIZE; | |
1970 | } | |
1971 | ||
1728d4fa ND |
1972 | struct net *ip6_tnl_get_link_net(const struct net_device *dev) |
1973 | { | |
1974 | struct ip6_tnl *tunnel = netdev_priv(dev); | |
1975 | ||
1976 | return tunnel->net; | |
1977 | } | |
1978 | EXPORT_SYMBOL(ip6_tnl_get_link_net); | |
1979 | ||
0b112457 ND |
1980 | static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = { |
1981 | [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, | |
1982 | [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) }, | |
1983 | [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) }, | |
1984 | [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, | |
1985 | [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 }, | |
1986 | [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 }, | |
1987 | [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 }, | |
1988 | [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, | |
b3a27b51 TH |
1989 | [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, |
1990 | [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, | |
1991 | [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, | |
1992 | [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, | |
0b112457 ND |
1993 | }; |
1994 | ||
c075b130 ND |
1995 | static struct rtnl_link_ops ip6_link_ops __read_mostly = { |
1996 | .kind = "ip6tnl", | |
1997 | .maxtype = IFLA_IPTUN_MAX, | |
0b112457 | 1998 | .policy = ip6_tnl_policy, |
c075b130 | 1999 | .priv_size = sizeof(struct ip6_tnl), |
0b112457 ND |
2000 | .setup = ip6_tnl_dev_setup, |
2001 | .validate = ip6_tnl_validate, | |
2002 | .newlink = ip6_tnl_newlink, | |
2003 | .changelink = ip6_tnl_changelink, | |
1e9f3d6f | 2004 | .dellink = ip6_tnl_dellink, |
b58d731a ND |
2005 | .get_size = ip6_tnl_get_size, |
2006 | .fill_info = ip6_tnl_fill_info, | |
1728d4fa | 2007 | .get_link_net = ip6_tnl_get_link_net, |
c075b130 ND |
2008 | }; |
2009 | ||
3ff2cfa5 | 2010 | static struct xfrm6_tunnel ip4ip6_handler __read_mostly = { |
c4d3efaf YK |
2011 | .handler = ip4ip6_rcv, |
2012 | .err_handler = ip4ip6_err, | |
2013 | .priority = 1, | |
2014 | }; | |
2015 | ||
3ff2cfa5 | 2016 | static struct xfrm6_tunnel ip6ip6_handler __read_mostly = { |
0303770d PM |
2017 | .handler = ip6ip6_rcv, |
2018 | .err_handler = ip6ip6_err, | |
d2acc347 | 2019 | .priority = 1, |
1da177e4 LT |
2020 | }; |
2021 | ||
1e9f3d6f | 2022 | static void __net_exit ip6_tnl_destroy_tunnels(struct net *net) |
3e6c9fb5 | 2023 | { |
1e9f3d6f | 2024 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
0bd87628 | 2025 | struct net_device *dev, *aux; |
3e6c9fb5 PE |
2026 | int h; |
2027 | struct ip6_tnl *t; | |
cf4432f5 | 2028 | LIST_HEAD(list); |
3e6c9fb5 | 2029 | |
0bd87628 ND |
2030 | for_each_netdev_safe(net, dev, aux) |
2031 | if (dev->rtnl_link_ops == &ip6_link_ops) | |
2032 | unregister_netdevice_queue(dev, &list); | |
2033 | ||
3e6c9fb5 | 2034 | for (h = 0; h < HASH_SIZE; h++) { |
94767632 | 2035 | t = rtnl_dereference(ip6n->tnls_r_l[h]); |
53b24b8f | 2036 | while (t) { |
0bd87628 ND |
2037 | /* If dev is in the same netns, it has already |
2038 | * been added to the list by the previous loop. | |
2039 | */ | |
2040 | if (!net_eq(dev_net(t->dev), net)) | |
2041 | unregister_netdevice_queue(t->dev, &list); | |
94767632 | 2042 | t = rtnl_dereference(t->next); |
cf4432f5 | 2043 | } |
3e6c9fb5 PE |
2044 | } |
2045 | ||
cf4432f5 | 2046 | unregister_netdevice_many(&list); |
3e6c9fb5 PE |
2047 | } |
2048 | ||
2c8c1e72 | 2049 | static int __net_init ip6_tnl_init_net(struct net *net) |
13eeb8e9 | 2050 | { |
ac31cd3c | 2051 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
731abb9c | 2052 | struct ip6_tnl *t = NULL; |
13eeb8e9 | 2053 | int err; |
13eeb8e9 | 2054 | |
3e6c9fb5 PE |
2055 | ip6n->tnls[0] = ip6n->tnls_wc; |
2056 | ip6n->tnls[1] = ip6n->tnls_r_l; | |
2057 | ||
15820e12 PE |
2058 | err = -ENOMEM; |
2059 | ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", | |
c835a677 | 2060 | NET_NAME_UNKNOWN, ip6_tnl_dev_setup); |
15820e12 PE |
2061 | |
2062 | if (!ip6n->fb_tnl_dev) | |
2063 | goto err_alloc_dev; | |
be77e593 | 2064 | dev_net_set(ip6n->fb_tnl_dev, net); |
bb814094 | 2065 | ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops; |
0bd87628 ND |
2066 | /* FB netdevice is special: we have one, and only one per netns. |
2067 | * Allowing to move it to another netns is clearly unsafe. | |
2068 | */ | |
2069 | ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL; | |
15820e12 | 2070 | |
8560f226 ED |
2071 | err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); |
2072 | if (err < 0) | |
2073 | goto err_register; | |
15820e12 PE |
2074 | |
2075 | err = register_netdev(ip6n->fb_tnl_dev); | |
2076 | if (err < 0) | |
2077 | goto err_register; | |
731abb9c JB |
2078 | |
2079 | t = netdev_priv(ip6n->fb_tnl_dev); | |
2080 | ||
2081 | strcpy(t->parms.name, ip6n->fb_tnl_dev->name); | |
13eeb8e9 PE |
2082 | return 0; |
2083 | ||
15820e12 | 2084 | err_register: |
8560f226 | 2085 | ip6_dev_free(ip6n->fb_tnl_dev); |
15820e12 | 2086 | err_alloc_dev: |
13eeb8e9 PE |
2087 | return err; |
2088 | } | |
2089 | ||
2c8c1e72 | 2090 | static void __net_exit ip6_tnl_exit_net(struct net *net) |
13eeb8e9 | 2091 | { |
3e6c9fb5 | 2092 | rtnl_lock(); |
1e9f3d6f | 2093 | ip6_tnl_destroy_tunnels(net); |
3e6c9fb5 | 2094 | rtnl_unlock(); |
13eeb8e9 PE |
2095 | } |
2096 | ||
2097 | static struct pernet_operations ip6_tnl_net_ops = { | |
2098 | .init = ip6_tnl_init_net, | |
2099 | .exit = ip6_tnl_exit_net, | |
ac31cd3c EB |
2100 | .id = &ip6_tnl_net_id, |
2101 | .size = sizeof(struct ip6_tnl_net), | |
13eeb8e9 PE |
2102 | }; |
2103 | ||
1da177e4 LT |
2104 | /** |
2105 | * ip6_tunnel_init - register protocol and reserve needed resources | |
2106 | * | |
2107 | * Return: 0 on success | |
2108 | **/ | |
2109 | ||
2110 | static int __init ip6_tunnel_init(void) | |
2111 | { | |
2112 | int err; | |
2113 | ||
d5aa407f AD |
2114 | err = register_pernet_device(&ip6_tnl_net_ops); |
2115 | if (err < 0) | |
2116 | goto out_pernet; | |
2117 | ||
2118 | err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET); | |
2119 | if (err < 0) { | |
f3213831 | 2120 | pr_err("%s: can't register ip4ip6\n", __func__); |
d5aa407f | 2121 | goto out_ip4ip6; |
c4d3efaf YK |
2122 | } |
2123 | ||
d5aa407f AD |
2124 | err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6); |
2125 | if (err < 0) { | |
f3213831 | 2126 | pr_err("%s: can't register ip6ip6\n", __func__); |
d5aa407f | 2127 | goto out_ip6ip6; |
1da177e4 | 2128 | } |
c075b130 ND |
2129 | err = rtnl_link_register(&ip6_link_ops); |
2130 | if (err < 0) | |
2131 | goto rtnl_link_failed; | |
13eeb8e9 | 2132 | |
1da177e4 | 2133 | return 0; |
d5aa407f | 2134 | |
c075b130 ND |
2135 | rtnl_link_failed: |
2136 | xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6); | |
d5aa407f | 2137 | out_ip6ip6: |
c4d3efaf | 2138 | xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); |
d5aa407f AD |
2139 | out_ip4ip6: |
2140 | unregister_pernet_device(&ip6_tnl_net_ops); | |
2141 | out_pernet: | |
1da177e4 LT |
2142 | return err; |
2143 | } | |
2144 | ||
2145 | /** | |
2146 | * ip6_tunnel_cleanup - free resources and unregister protocol | |
2147 | **/ | |
2148 | ||
2149 | static void __exit ip6_tunnel_cleanup(void) | |
2150 | { | |
c075b130 | 2151 | rtnl_link_unregister(&ip6_link_ops); |
c4d3efaf | 2152 | if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) |
f3213831 | 2153 | pr_info("%s: can't deregister ip4ip6\n", __func__); |
c4d3efaf | 2154 | |
73d605d1 | 2155 | if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) |
f3213831 | 2156 | pr_info("%s: can't deregister ip6ip6\n", __func__); |
1da177e4 | 2157 | |
ac31cd3c | 2158 | unregister_pernet_device(&ip6_tnl_net_ops); |
1da177e4 LT |
2159 | } |
2160 | ||
2161 | module_init(ip6_tunnel_init); | |
2162 | module_exit(ip6_tunnel_cleanup); |