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Commit | Line | Data |
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1 | /* | |
2 | * IPv6 tunneling device | |
3 | * Linux INET6 implementation | |
4 | * | |
5 | * Authors: | |
6 | * Ville Nuorvala <vnuorval@tcs.hut.fi> | |
7 | * Yasuyuki Kozakai <kozakai@linux-ipv6.org> | |
8 | * | |
9 | * Based on: | |
10 | * linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c | |
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 | ||
21 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
22 | ||
23 | #include <linux/module.h> | |
24 | #include <linux/capability.h> | |
25 | #include <linux/errno.h> | |
26 | #include <linux/types.h> | |
27 | #include <linux/sockios.h> | |
28 | #include <linux/icmp.h> | |
29 | #include <linux/if.h> | |
30 | #include <linux/in.h> | |
31 | #include <linux/ip.h> | |
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> | |
41 | #include <linux/slab.h> | |
42 | #include <linux/hash.h> | |
43 | #include <linux/etherdevice.h> | |
44 | ||
45 | #include <linux/uaccess.h> | |
46 | #include <linux/atomic.h> | |
47 | ||
48 | #include <net/icmp.h> | |
49 | #include <net/ip.h> | |
50 | #include <net/ip_tunnels.h> | |
51 | #include <net/ipv6.h> | |
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> | |
58 | #include <net/net_namespace.h> | |
59 | #include <net/netns/generic.h> | |
60 | #include <net/dst_metadata.h> | |
61 | ||
62 | MODULE_AUTHOR("Ville Nuorvala"); | |
63 | MODULE_DESCRIPTION("IPv6 tunneling device"); | |
64 | MODULE_LICENSE("GPL"); | |
65 | MODULE_ALIAS_RTNL_LINK("ip6tnl"); | |
66 | MODULE_ALIAS_NETDEV("ip6tnl0"); | |
67 | ||
68 | #define IP6_TUNNEL_HASH_SIZE_SHIFT 5 | |
69 | #define IP6_TUNNEL_HASH_SIZE (1 << IP6_TUNNEL_HASH_SIZE_SHIFT) | |
70 | ||
71 | static bool log_ecn_error = true; | |
72 | module_param(log_ecn_error, bool, 0644); | |
73 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); | |
74 | ||
75 | static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2) | |
76 | { | |
77 | u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2); | |
78 | ||
79 | return hash_32(hash, IP6_TUNNEL_HASH_SIZE_SHIFT); | |
80 | } | |
81 | ||
82 | static int ip6_tnl_dev_init(struct net_device *dev); | |
83 | static void ip6_tnl_dev_setup(struct net_device *dev); | |
84 | static struct rtnl_link_ops ip6_link_ops __read_mostly; | |
85 | ||
86 | static unsigned int ip6_tnl_net_id __read_mostly; | |
87 | struct ip6_tnl_net { | |
88 | /* the IPv6 tunnel fallback device */ | |
89 | struct net_device *fb_tnl_dev; | |
90 | /* lists for storing tunnels in use */ | |
91 | struct ip6_tnl __rcu *tnls_r_l[IP6_TUNNEL_HASH_SIZE]; | |
92 | struct ip6_tnl __rcu *tnls_wc[1]; | |
93 | struct ip6_tnl __rcu **tnls[2]; | |
94 | struct ip6_tnl __rcu *collect_md_tun; | |
95 | }; | |
96 | ||
97 | static struct net_device_stats *ip6_get_stats(struct net_device *dev) | |
98 | { | |
99 | struct pcpu_sw_netstats tmp, sum = { 0 }; | |
100 | int i; | |
101 | ||
102 | for_each_possible_cpu(i) { | |
103 | unsigned int start; | |
104 | const struct pcpu_sw_netstats *tstats = | |
105 | per_cpu_ptr(dev->tstats, i); | |
106 | ||
107 | do { | |
108 | start = u64_stats_fetch_begin_irq(&tstats->syncp); | |
109 | tmp.rx_packets = tstats->rx_packets; | |
110 | tmp.rx_bytes = tstats->rx_bytes; | |
111 | tmp.tx_packets = tstats->tx_packets; | |
112 | tmp.tx_bytes = tstats->tx_bytes; | |
113 | } while (u64_stats_fetch_retry_irq(&tstats->syncp, start)); | |
114 | ||
115 | sum.rx_packets += tmp.rx_packets; | |
116 | sum.rx_bytes += tmp.rx_bytes; | |
117 | sum.tx_packets += tmp.tx_packets; | |
118 | sum.tx_bytes += tmp.tx_bytes; | |
119 | } | |
120 | dev->stats.rx_packets = sum.rx_packets; | |
121 | dev->stats.rx_bytes = sum.rx_bytes; | |
122 | dev->stats.tx_packets = sum.tx_packets; | |
123 | dev->stats.tx_bytes = sum.tx_bytes; | |
124 | return &dev->stats; | |
125 | } | |
126 | ||
127 | /** | |
128 | * ip6_tnl_lookup - fetch tunnel matching the end-point addresses | |
129 | * @remote: the address of the tunnel exit-point | |
130 | * @local: the address of the tunnel entry-point | |
131 | * | |
132 | * Return: | |
133 | * tunnel matching given end-points if found, | |
134 | * else fallback tunnel if its device is up, | |
135 | * else %NULL | |
136 | **/ | |
137 | ||
138 | #define for_each_ip6_tunnel_rcu(start) \ | |
139 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) | |
140 | ||
141 | static struct ip6_tnl * | |
142 | ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local) | |
143 | { | |
144 | unsigned int hash = HASH(remote, local); | |
145 | struct ip6_tnl *t; | |
146 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
147 | struct in6_addr any; | |
148 | ||
149 | for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { | |
150 | if (ipv6_addr_equal(local, &t->parms.laddr) && | |
151 | ipv6_addr_equal(remote, &t->parms.raddr) && | |
152 | (t->dev->flags & IFF_UP)) | |
153 | return t; | |
154 | } | |
155 | ||
156 | memset(&any, 0, sizeof(any)); | |
157 | hash = HASH(&any, local); | |
158 | for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { | |
159 | if (ipv6_addr_equal(local, &t->parms.laddr) && | |
160 | ipv6_addr_any(&t->parms.raddr) && | |
161 | (t->dev->flags & IFF_UP)) | |
162 | return t; | |
163 | } | |
164 | ||
165 | hash = HASH(remote, &any); | |
166 | for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { | |
167 | if (ipv6_addr_equal(remote, &t->parms.raddr) && | |
168 | ipv6_addr_any(&t->parms.laddr) && | |
169 | (t->dev->flags & IFF_UP)) | |
170 | return t; | |
171 | } | |
172 | ||
173 | t = rcu_dereference(ip6n->collect_md_tun); | |
174 | if (t && t->dev->flags & IFF_UP) | |
175 | return t; | |
176 | ||
177 | t = rcu_dereference(ip6n->tnls_wc[0]); | |
178 | if (t && (t->dev->flags & IFF_UP)) | |
179 | return t; | |
180 | ||
181 | return NULL; | |
182 | } | |
183 | ||
184 | /** | |
185 | * ip6_tnl_bucket - get head of list matching given tunnel parameters | |
186 | * @p: parameters containing tunnel end-points | |
187 | * | |
188 | * Description: | |
189 | * ip6_tnl_bucket() returns the head of the list matching the | |
190 | * &struct in6_addr entries laddr and raddr in @p. | |
191 | * | |
192 | * Return: head of IPv6 tunnel list | |
193 | **/ | |
194 | ||
195 | static struct ip6_tnl __rcu ** | |
196 | ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p) | |
197 | { | |
198 | const struct in6_addr *remote = &p->raddr; | |
199 | const struct in6_addr *local = &p->laddr; | |
200 | unsigned int h = 0; | |
201 | int prio = 0; | |
202 | ||
203 | if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { | |
204 | prio = 1; | |
205 | h = HASH(remote, local); | |
206 | } | |
207 | return &ip6n->tnls[prio][h]; | |
208 | } | |
209 | ||
210 | /** | |
211 | * ip6_tnl_link - add tunnel to hash table | |
212 | * @t: tunnel to be added | |
213 | **/ | |
214 | ||
215 | static void | |
216 | ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) | |
217 | { | |
218 | struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms); | |
219 | ||
220 | if (t->parms.collect_md) | |
221 | rcu_assign_pointer(ip6n->collect_md_tun, t); | |
222 | rcu_assign_pointer(t->next , rtnl_dereference(*tp)); | |
223 | rcu_assign_pointer(*tp, t); | |
224 | } | |
225 | ||
226 | /** | |
227 | * ip6_tnl_unlink - remove tunnel from hash table | |
228 | * @t: tunnel to be removed | |
229 | **/ | |
230 | ||
231 | static void | |
232 | ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) | |
233 | { | |
234 | struct ip6_tnl __rcu **tp; | |
235 | struct ip6_tnl *iter; | |
236 | ||
237 | if (t->parms.collect_md) | |
238 | rcu_assign_pointer(ip6n->collect_md_tun, NULL); | |
239 | ||
240 | for (tp = ip6_tnl_bucket(ip6n, &t->parms); | |
241 | (iter = rtnl_dereference(*tp)) != NULL; | |
242 | tp = &iter->next) { | |
243 | if (t == iter) { | |
244 | rcu_assign_pointer(*tp, t->next); | |
245 | break; | |
246 | } | |
247 | } | |
248 | } | |
249 | ||
250 | static void ip6_dev_free(struct net_device *dev) | |
251 | { | |
252 | struct ip6_tnl *t = netdev_priv(dev); | |
253 | ||
254 | gro_cells_destroy(&t->gro_cells); | |
255 | dst_cache_destroy(&t->dst_cache); | |
256 | free_percpu(dev->tstats); | |
257 | } | |
258 | ||
259 | static int ip6_tnl_create2(struct net_device *dev) | |
260 | { | |
261 | struct ip6_tnl *t = netdev_priv(dev); | |
262 | struct net *net = dev_net(dev); | |
263 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
264 | int err; | |
265 | ||
266 | t = netdev_priv(dev); | |
267 | ||
268 | dev->rtnl_link_ops = &ip6_link_ops; | |
269 | err = register_netdevice(dev); | |
270 | if (err < 0) | |
271 | goto out; | |
272 | ||
273 | strcpy(t->parms.name, dev->name); | |
274 | ||
275 | dev_hold(dev); | |
276 | ip6_tnl_link(ip6n, t); | |
277 | return 0; | |
278 | ||
279 | out: | |
280 | return err; | |
281 | } | |
282 | ||
283 | /** | |
284 | * ip6_tnl_create - create a new tunnel | |
285 | * @p: tunnel parameters | |
286 | * @pt: pointer to new tunnel | |
287 | * | |
288 | * Description: | |
289 | * Create tunnel matching given parameters. | |
290 | * | |
291 | * Return: | |
292 | * created tunnel or error pointer | |
293 | **/ | |
294 | ||
295 | static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p) | |
296 | { | |
297 | struct net_device *dev; | |
298 | struct ip6_tnl *t; | |
299 | char name[IFNAMSIZ]; | |
300 | int err = -E2BIG; | |
301 | ||
302 | if (p->name[0]) { | |
303 | if (!dev_valid_name(p->name)) | |
304 | goto failed; | |
305 | strlcpy(name, p->name, IFNAMSIZ); | |
306 | } else { | |
307 | sprintf(name, "ip6tnl%%d"); | |
308 | } | |
309 | err = -ENOMEM; | |
310 | dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, | |
311 | ip6_tnl_dev_setup); | |
312 | if (!dev) | |
313 | goto failed; | |
314 | ||
315 | dev_net_set(dev, net); | |
316 | ||
317 | t = netdev_priv(dev); | |
318 | t->parms = *p; | |
319 | t->net = dev_net(dev); | |
320 | err = ip6_tnl_create2(dev); | |
321 | if (err < 0) | |
322 | goto failed_free; | |
323 | ||
324 | return t; | |
325 | ||
326 | failed_free: | |
327 | free_netdev(dev); | |
328 | failed: | |
329 | return ERR_PTR(err); | |
330 | } | |
331 | ||
332 | /** | |
333 | * ip6_tnl_locate - find or create tunnel matching given parameters | |
334 | * @p: tunnel parameters | |
335 | * @create: != 0 if allowed to create new tunnel if no match found | |
336 | * | |
337 | * Description: | |
338 | * ip6_tnl_locate() first tries to locate an existing tunnel | |
339 | * based on @parms. If this is unsuccessful, but @create is set a new | |
340 | * tunnel device is created and registered for use. | |
341 | * | |
342 | * Return: | |
343 | * matching tunnel or error pointer | |
344 | **/ | |
345 | ||
346 | static struct ip6_tnl *ip6_tnl_locate(struct net *net, | |
347 | struct __ip6_tnl_parm *p, int create) | |
348 | { | |
349 | const struct in6_addr *remote = &p->raddr; | |
350 | const struct in6_addr *local = &p->laddr; | |
351 | struct ip6_tnl __rcu **tp; | |
352 | struct ip6_tnl *t; | |
353 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
354 | ||
355 | for (tp = ip6_tnl_bucket(ip6n, p); | |
356 | (t = rtnl_dereference(*tp)) != NULL; | |
357 | tp = &t->next) { | |
358 | if (ipv6_addr_equal(local, &t->parms.laddr) && | |
359 | ipv6_addr_equal(remote, &t->parms.raddr)) { | |
360 | if (create) | |
361 | return ERR_PTR(-EEXIST); | |
362 | ||
363 | return t; | |
364 | } | |
365 | } | |
366 | if (!create) | |
367 | return ERR_PTR(-ENODEV); | |
368 | return ip6_tnl_create(net, p); | |
369 | } | |
370 | ||
371 | /** | |
372 | * ip6_tnl_dev_uninit - tunnel device uninitializer | |
373 | * @dev: the device to be destroyed | |
374 | * | |
375 | * Description: | |
376 | * ip6_tnl_dev_uninit() removes tunnel from its list | |
377 | **/ | |
378 | ||
379 | static void | |
380 | ip6_tnl_dev_uninit(struct net_device *dev) | |
381 | { | |
382 | struct ip6_tnl *t = netdev_priv(dev); | |
383 | struct net *net = t->net; | |
384 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
385 | ||
386 | if (dev == ip6n->fb_tnl_dev) | |
387 | RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL); | |
388 | else | |
389 | ip6_tnl_unlink(ip6n, t); | |
390 | dst_cache_reset(&t->dst_cache); | |
391 | dev_put(dev); | |
392 | } | |
393 | ||
394 | /** | |
395 | * parse_tvl_tnl_enc_lim - handle encapsulation limit option | |
396 | * @skb: received socket buffer | |
397 | * | |
398 | * Return: | |
399 | * 0 if none was found, | |
400 | * else index to encapsulation limit | |
401 | **/ | |
402 | ||
403 | __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw) | |
404 | { | |
405 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)raw; | |
406 | unsigned int nhoff = raw - skb->data; | |
407 | unsigned int off = nhoff + sizeof(*ipv6h); | |
408 | u8 next, nexthdr = ipv6h->nexthdr; | |
409 | ||
410 | while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { | |
411 | struct ipv6_opt_hdr *hdr; | |
412 | u16 optlen; | |
413 | ||
414 | if (!pskb_may_pull(skb, off + sizeof(*hdr))) | |
415 | break; | |
416 | ||
417 | hdr = (struct ipv6_opt_hdr *)(skb->data + off); | |
418 | if (nexthdr == NEXTHDR_FRAGMENT) { | |
419 | struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; | |
420 | if (frag_hdr->frag_off) | |
421 | break; | |
422 | optlen = 8; | |
423 | } else if (nexthdr == NEXTHDR_AUTH) { | |
424 | optlen = (hdr->hdrlen + 2) << 2; | |
425 | } else { | |
426 | optlen = ipv6_optlen(hdr); | |
427 | } | |
428 | /* cache hdr->nexthdr, since pskb_may_pull() might | |
429 | * invalidate hdr | |
430 | */ | |
431 | next = hdr->nexthdr; | |
432 | if (nexthdr == NEXTHDR_DEST) { | |
433 | u16 i = 2; | |
434 | ||
435 | /* Remember : hdr is no longer valid at this point. */ | |
436 | if (!pskb_may_pull(skb, off + optlen)) | |
437 | break; | |
438 | ||
439 | while (1) { | |
440 | struct ipv6_tlv_tnl_enc_lim *tel; | |
441 | ||
442 | /* No more room for encapsulation limit */ | |
443 | if (i + sizeof(*tel) > optlen) | |
444 | break; | |
445 | ||
446 | tel = (struct ipv6_tlv_tnl_enc_lim *)(skb->data + off + i); | |
447 | /* return index of option if found and valid */ | |
448 | if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && | |
449 | tel->length == 1) | |
450 | return i + off - nhoff; | |
451 | /* else jump to next option */ | |
452 | if (tel->type) | |
453 | i += tel->length + 2; | |
454 | else | |
455 | i++; | |
456 | } | |
457 | } | |
458 | nexthdr = next; | |
459 | off += optlen; | |
460 | } | |
461 | return 0; | |
462 | } | |
463 | EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim); | |
464 | ||
465 | /** | |
466 | * ip6_tnl_err - tunnel error handler | |
467 | * | |
468 | * Description: | |
469 | * ip6_tnl_err() should handle errors in the tunnel according | |
470 | * to the specifications in RFC 2473. | |
471 | **/ | |
472 | ||
473 | static int | |
474 | ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, | |
475 | u8 *type, u8 *code, int *msg, __u32 *info, int offset) | |
476 | { | |
477 | const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data; | |
478 | struct net *net = dev_net(skb->dev); | |
479 | u8 rel_type = ICMPV6_DEST_UNREACH; | |
480 | u8 rel_code = ICMPV6_ADDR_UNREACH; | |
481 | __u32 rel_info = 0; | |
482 | struct ip6_tnl *t; | |
483 | int err = -ENOENT; | |
484 | int rel_msg = 0; | |
485 | u8 tproto; | |
486 | __u16 len; | |
487 | ||
488 | /* If the packet doesn't contain the original IPv6 header we are | |
489 | in trouble since we might need the source address for further | |
490 | processing of the error. */ | |
491 | ||
492 | rcu_read_lock(); | |
493 | t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, &ipv6h->saddr); | |
494 | if (!t) | |
495 | goto out; | |
496 | ||
497 | tproto = READ_ONCE(t->parms.proto); | |
498 | if (tproto != ipproto && tproto != 0) | |
499 | goto out; | |
500 | ||
501 | err = 0; | |
502 | ||
503 | switch (*type) { | |
504 | struct ipv6_tlv_tnl_enc_lim *tel; | |
505 | __u32 mtu, teli; | |
506 | case ICMPV6_DEST_UNREACH: | |
507 | net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n", | |
508 | t->parms.name); | |
509 | rel_msg = 1; | |
510 | break; | |
511 | case ICMPV6_TIME_EXCEED: | |
512 | if ((*code) == ICMPV6_EXC_HOPLIMIT) { | |
513 | net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", | |
514 | t->parms.name); | |
515 | rel_msg = 1; | |
516 | } | |
517 | break; | |
518 | case ICMPV6_PARAMPROB: | |
519 | teli = 0; | |
520 | if ((*code) == ICMPV6_HDR_FIELD) | |
521 | teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); | |
522 | ||
523 | if (teli && teli == *info - 2) { | |
524 | tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; | |
525 | if (tel->encap_limit == 0) { | |
526 | net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", | |
527 | t->parms.name); | |
528 | rel_msg = 1; | |
529 | } | |
530 | } else { | |
531 | net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n", | |
532 | t->parms.name); | |
533 | } | |
534 | break; | |
535 | case ICMPV6_PKT_TOOBIG: | |
536 | ip6_update_pmtu(skb, net, htonl(*info), 0, 0, | |
537 | sock_net_uid(net, NULL)); | |
538 | mtu = *info - offset; | |
539 | if (mtu < IPV6_MIN_MTU) | |
540 | mtu = IPV6_MIN_MTU; | |
541 | len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len); | |
542 | if (len > mtu) { | |
543 | rel_type = ICMPV6_PKT_TOOBIG; | |
544 | rel_code = 0; | |
545 | rel_info = mtu; | |
546 | rel_msg = 1; | |
547 | } | |
548 | break; | |
549 | case NDISC_REDIRECT: | |
550 | ip6_redirect(skb, net, skb->dev->ifindex, 0, | |
551 | sock_net_uid(net, NULL)); | |
552 | break; | |
553 | } | |
554 | ||
555 | *type = rel_type; | |
556 | *code = rel_code; | |
557 | *info = rel_info; | |
558 | *msg = rel_msg; | |
559 | ||
560 | out: | |
561 | rcu_read_unlock(); | |
562 | return err; | |
563 | } | |
564 | ||
565 | static int | |
566 | ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
567 | u8 type, u8 code, int offset, __be32 info) | |
568 | { | |
569 | __u32 rel_info = ntohl(info); | |
570 | const struct iphdr *eiph; | |
571 | struct sk_buff *skb2; | |
572 | int err, rel_msg = 0; | |
573 | u8 rel_type = type; | |
574 | u8 rel_code = code; | |
575 | struct rtable *rt; | |
576 | struct flowi4 fl4; | |
577 | ||
578 | err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, | |
579 | &rel_msg, &rel_info, offset); | |
580 | if (err < 0) | |
581 | return err; | |
582 | ||
583 | if (rel_msg == 0) | |
584 | return 0; | |
585 | ||
586 | switch (rel_type) { | |
587 | case ICMPV6_DEST_UNREACH: | |
588 | if (rel_code != ICMPV6_ADDR_UNREACH) | |
589 | return 0; | |
590 | rel_type = ICMP_DEST_UNREACH; | |
591 | rel_code = ICMP_HOST_UNREACH; | |
592 | break; | |
593 | case ICMPV6_PKT_TOOBIG: | |
594 | if (rel_code != 0) | |
595 | return 0; | |
596 | rel_type = ICMP_DEST_UNREACH; | |
597 | rel_code = ICMP_FRAG_NEEDED; | |
598 | break; | |
599 | default: | |
600 | return 0; | |
601 | } | |
602 | ||
603 | if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) | |
604 | return 0; | |
605 | ||
606 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
607 | if (!skb2) | |
608 | return 0; | |
609 | ||
610 | skb_dst_drop(skb2); | |
611 | ||
612 | skb_pull(skb2, offset); | |
613 | skb_reset_network_header(skb2); | |
614 | eiph = ip_hdr(skb2); | |
615 | ||
616 | /* Try to guess incoming interface */ | |
617 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, eiph->saddr, | |
618 | 0, 0, 0, IPPROTO_IPIP, RT_TOS(eiph->tos), 0); | |
619 | if (IS_ERR(rt)) | |
620 | goto out; | |
621 | ||
622 | skb2->dev = rt->dst.dev; | |
623 | ip_rt_put(rt); | |
624 | ||
625 | /* route "incoming" packet */ | |
626 | if (rt->rt_flags & RTCF_LOCAL) { | |
627 | rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, | |
628 | eiph->daddr, eiph->saddr, 0, 0, | |
629 | IPPROTO_IPIP, RT_TOS(eiph->tos), 0); | |
630 | if (IS_ERR(rt) || rt->dst.dev->type != ARPHRD_TUNNEL6) { | |
631 | if (!IS_ERR(rt)) | |
632 | ip_rt_put(rt); | |
633 | goto out; | |
634 | } | |
635 | skb_dst_set(skb2, &rt->dst); | |
636 | } else { | |
637 | if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, | |
638 | skb2->dev) || | |
639 | skb_dst(skb2)->dev->type != ARPHRD_TUNNEL6) | |
640 | goto out; | |
641 | } | |
642 | ||
643 | /* change mtu on this route */ | |
644 | if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { | |
645 | if (rel_info > dst_mtu(skb_dst(skb2))) | |
646 | goto out; | |
647 | ||
648 | skb_dst_update_pmtu_no_confirm(skb2, rel_info); | |
649 | } | |
650 | ||
651 | icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); | |
652 | ||
653 | out: | |
654 | kfree_skb(skb2); | |
655 | return 0; | |
656 | } | |
657 | ||
658 | static int | |
659 | ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
660 | u8 type, u8 code, int offset, __be32 info) | |
661 | { | |
662 | __u32 rel_info = ntohl(info); | |
663 | int err, rel_msg = 0; | |
664 | u8 rel_type = type; | |
665 | u8 rel_code = code; | |
666 | ||
667 | err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, | |
668 | &rel_msg, &rel_info, offset); | |
669 | if (err < 0) | |
670 | return err; | |
671 | ||
672 | if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { | |
673 | struct rt6_info *rt; | |
674 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
675 | ||
676 | if (!skb2) | |
677 | return 0; | |
678 | ||
679 | skb_dst_drop(skb2); | |
680 | skb_pull(skb2, offset); | |
681 | skb_reset_network_header(skb2); | |
682 | ||
683 | /* Try to guess incoming interface */ | |
684 | rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, | |
685 | NULL, 0, 0); | |
686 | ||
687 | if (rt && rt->dst.dev) | |
688 | skb2->dev = rt->dst.dev; | |
689 | ||
690 | icmpv6_send(skb2, rel_type, rel_code, rel_info); | |
691 | ||
692 | ip6_rt_put(rt); | |
693 | ||
694 | kfree_skb(skb2); | |
695 | } | |
696 | ||
697 | return 0; | |
698 | } | |
699 | ||
700 | static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, | |
701 | const struct ipv6hdr *ipv6h, | |
702 | struct sk_buff *skb) | |
703 | { | |
704 | __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; | |
705 | ||
706 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) | |
707 | ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); | |
708 | ||
709 | return IP6_ECN_decapsulate(ipv6h, skb); | |
710 | } | |
711 | ||
712 | static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, | |
713 | const struct ipv6hdr *ipv6h, | |
714 | struct sk_buff *skb) | |
715 | { | |
716 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) | |
717 | ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); | |
718 | ||
719 | return IP6_ECN_decapsulate(ipv6h, skb); | |
720 | } | |
721 | ||
722 | __u32 ip6_tnl_get_cap(struct ip6_tnl *t, | |
723 | const struct in6_addr *laddr, | |
724 | const struct in6_addr *raddr) | |
725 | { | |
726 | struct __ip6_tnl_parm *p = &t->parms; | |
727 | int ltype = ipv6_addr_type(laddr); | |
728 | int rtype = ipv6_addr_type(raddr); | |
729 | __u32 flags = 0; | |
730 | ||
731 | if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) { | |
732 | flags = IP6_TNL_F_CAP_PER_PACKET; | |
733 | } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
734 | rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
735 | !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && | |
736 | (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { | |
737 | if (ltype&IPV6_ADDR_UNICAST) | |
738 | flags |= IP6_TNL_F_CAP_XMIT; | |
739 | if (rtype&IPV6_ADDR_UNICAST) | |
740 | flags |= IP6_TNL_F_CAP_RCV; | |
741 | } | |
742 | return flags; | |
743 | } | |
744 | EXPORT_SYMBOL(ip6_tnl_get_cap); | |
745 | ||
746 | /* called with rcu_read_lock() */ | |
747 | int ip6_tnl_rcv_ctl(struct ip6_tnl *t, | |
748 | const struct in6_addr *laddr, | |
749 | const struct in6_addr *raddr) | |
750 | { | |
751 | struct __ip6_tnl_parm *p = &t->parms; | |
752 | int ret = 0; | |
753 | struct net *net = t->net; | |
754 | ||
755 | if ((p->flags & IP6_TNL_F_CAP_RCV) || | |
756 | ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && | |
757 | (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) { | |
758 | struct net_device *ldev = NULL; | |
759 | ||
760 | if (p->link) | |
761 | ldev = dev_get_by_index_rcu(net, p->link); | |
762 | ||
763 | if ((ipv6_addr_is_multicast(laddr) || | |
764 | likely(ipv6_chk_addr(net, laddr, ldev, 0))) && | |
765 | ((p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) || | |
766 | likely(!ipv6_chk_addr(net, raddr, NULL, 0)))) | |
767 | ret = 1; | |
768 | } | |
769 | return ret; | |
770 | } | |
771 | EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl); | |
772 | ||
773 | static int __ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb, | |
774 | const struct tnl_ptk_info *tpi, | |
775 | struct metadata_dst *tun_dst, | |
776 | int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, | |
777 | const struct ipv6hdr *ipv6h, | |
778 | struct sk_buff *skb), | |
779 | bool log_ecn_err) | |
780 | { | |
781 | struct pcpu_sw_netstats *tstats; | |
782 | const struct ipv6hdr *ipv6h = ipv6_hdr(skb); | |
783 | int err; | |
784 | ||
785 | if ((!(tpi->flags & TUNNEL_CSUM) && | |
786 | (tunnel->parms.i_flags & TUNNEL_CSUM)) || | |
787 | ((tpi->flags & TUNNEL_CSUM) && | |
788 | !(tunnel->parms.i_flags & TUNNEL_CSUM))) { | |
789 | tunnel->dev->stats.rx_crc_errors++; | |
790 | tunnel->dev->stats.rx_errors++; | |
791 | goto drop; | |
792 | } | |
793 | ||
794 | if (tunnel->parms.i_flags & TUNNEL_SEQ) { | |
795 | if (!(tpi->flags & TUNNEL_SEQ) || | |
796 | (tunnel->i_seqno && | |
797 | (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) { | |
798 | tunnel->dev->stats.rx_fifo_errors++; | |
799 | tunnel->dev->stats.rx_errors++; | |
800 | goto drop; | |
801 | } | |
802 | tunnel->i_seqno = ntohl(tpi->seq) + 1; | |
803 | } | |
804 | ||
805 | skb->protocol = tpi->proto; | |
806 | ||
807 | /* Warning: All skb pointers will be invalidated! */ | |
808 | if (tunnel->dev->type == ARPHRD_ETHER) { | |
809 | if (!pskb_may_pull(skb, ETH_HLEN)) { | |
810 | tunnel->dev->stats.rx_length_errors++; | |
811 | tunnel->dev->stats.rx_errors++; | |
812 | goto drop; | |
813 | } | |
814 | ||
815 | ipv6h = ipv6_hdr(skb); | |
816 | skb->protocol = eth_type_trans(skb, tunnel->dev); | |
817 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); | |
818 | } else { | |
819 | skb->dev = tunnel->dev; | |
820 | } | |
821 | ||
822 | skb_reset_network_header(skb); | |
823 | memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); | |
824 | ||
825 | __skb_tunnel_rx(skb, tunnel->dev, tunnel->net); | |
826 | ||
827 | err = dscp_ecn_decapsulate(tunnel, ipv6h, skb); | |
828 | if (unlikely(err)) { | |
829 | if (log_ecn_err) | |
830 | net_info_ratelimited("non-ECT from %pI6 with DS=%#x\n", | |
831 | &ipv6h->saddr, | |
832 | ipv6_get_dsfield(ipv6h)); | |
833 | if (err > 1) { | |
834 | ++tunnel->dev->stats.rx_frame_errors; | |
835 | ++tunnel->dev->stats.rx_errors; | |
836 | goto drop; | |
837 | } | |
838 | } | |
839 | ||
840 | tstats = this_cpu_ptr(tunnel->dev->tstats); | |
841 | u64_stats_update_begin(&tstats->syncp); | |
842 | tstats->rx_packets++; | |
843 | tstats->rx_bytes += skb->len; | |
844 | u64_stats_update_end(&tstats->syncp); | |
845 | ||
846 | skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev))); | |
847 | ||
848 | if (tun_dst) | |
849 | skb_dst_set(skb, (struct dst_entry *)tun_dst); | |
850 | ||
851 | gro_cells_receive(&tunnel->gro_cells, skb); | |
852 | return 0; | |
853 | ||
854 | drop: | |
855 | if (tun_dst) | |
856 | dst_release((struct dst_entry *)tun_dst); | |
857 | kfree_skb(skb); | |
858 | return 0; | |
859 | } | |
860 | ||
861 | int ip6_tnl_rcv(struct ip6_tnl *t, struct sk_buff *skb, | |
862 | const struct tnl_ptk_info *tpi, | |
863 | struct metadata_dst *tun_dst, | |
864 | bool log_ecn_err) | |
865 | { | |
866 | return __ip6_tnl_rcv(t, skb, tpi, NULL, ip6ip6_dscp_ecn_decapsulate, | |
867 | log_ecn_err); | |
868 | } | |
869 | EXPORT_SYMBOL(ip6_tnl_rcv); | |
870 | ||
871 | static const struct tnl_ptk_info tpi_v6 = { | |
872 | /* no tunnel info required for ipxip6. */ | |
873 | .proto = htons(ETH_P_IPV6), | |
874 | }; | |
875 | ||
876 | static const struct tnl_ptk_info tpi_v4 = { | |
877 | /* no tunnel info required for ipxip6. */ | |
878 | .proto = htons(ETH_P_IP), | |
879 | }; | |
880 | ||
881 | static int ipxip6_rcv(struct sk_buff *skb, u8 ipproto, | |
882 | const struct tnl_ptk_info *tpi, | |
883 | int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, | |
884 | const struct ipv6hdr *ipv6h, | |
885 | struct sk_buff *skb)) | |
886 | { | |
887 | struct ip6_tnl *t; | |
888 | const struct ipv6hdr *ipv6h = ipv6_hdr(skb); | |
889 | struct metadata_dst *tun_dst = NULL; | |
890 | int ret = -1; | |
891 | ||
892 | rcu_read_lock(); | |
893 | t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr); | |
894 | ||
895 | if (t) { | |
896 | u8 tproto = READ_ONCE(t->parms.proto); | |
897 | ||
898 | if (tproto != ipproto && tproto != 0) | |
899 | goto drop; | |
900 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
901 | goto drop; | |
902 | ipv6h = ipv6_hdr(skb); | |
903 | if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) | |
904 | goto drop; | |
905 | if (iptunnel_pull_header(skb, 0, tpi->proto, false)) | |
906 | goto drop; | |
907 | if (t->parms.collect_md) { | |
908 | tun_dst = ipv6_tun_rx_dst(skb, 0, 0, 0); | |
909 | if (!tun_dst) | |
910 | goto drop; | |
911 | } | |
912 | ret = __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate, | |
913 | log_ecn_error); | |
914 | } | |
915 | ||
916 | rcu_read_unlock(); | |
917 | ||
918 | return ret; | |
919 | ||
920 | drop: | |
921 | rcu_read_unlock(); | |
922 | kfree_skb(skb); | |
923 | return 0; | |
924 | } | |
925 | ||
926 | static int ip4ip6_rcv(struct sk_buff *skb) | |
927 | { | |
928 | return ipxip6_rcv(skb, IPPROTO_IPIP, &tpi_v4, | |
929 | ip4ip6_dscp_ecn_decapsulate); | |
930 | } | |
931 | ||
932 | static int ip6ip6_rcv(struct sk_buff *skb) | |
933 | { | |
934 | return ipxip6_rcv(skb, IPPROTO_IPV6, &tpi_v6, | |
935 | ip6ip6_dscp_ecn_decapsulate); | |
936 | } | |
937 | ||
938 | struct ipv6_tel_txoption { | |
939 | struct ipv6_txoptions ops; | |
940 | __u8 dst_opt[8]; | |
941 | }; | |
942 | ||
943 | static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) | |
944 | { | |
945 | memset(opt, 0, sizeof(struct ipv6_tel_txoption)); | |
946 | ||
947 | opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; | |
948 | opt->dst_opt[3] = 1; | |
949 | opt->dst_opt[4] = encap_limit; | |
950 | opt->dst_opt[5] = IPV6_TLV_PADN; | |
951 | opt->dst_opt[6] = 1; | |
952 | ||
953 | opt->ops.dst1opt = (struct ipv6_opt_hdr *) opt->dst_opt; | |
954 | opt->ops.opt_nflen = 8; | |
955 | } | |
956 | ||
957 | /** | |
958 | * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own | |
959 | * @t: the outgoing tunnel device | |
960 | * @hdr: IPv6 header from the incoming packet | |
961 | * | |
962 | * Description: | |
963 | * Avoid trivial tunneling loop by checking that tunnel exit-point | |
964 | * doesn't match source of incoming packet. | |
965 | * | |
966 | * Return: | |
967 | * 1 if conflict, | |
968 | * 0 else | |
969 | **/ | |
970 | ||
971 | static inline bool | |
972 | ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) | |
973 | { | |
974 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
975 | } | |
976 | ||
977 | int ip6_tnl_xmit_ctl(struct ip6_tnl *t, | |
978 | const struct in6_addr *laddr, | |
979 | const struct in6_addr *raddr) | |
980 | { | |
981 | struct __ip6_tnl_parm *p = &t->parms; | |
982 | int ret = 0; | |
983 | struct net *net = t->net; | |
984 | ||
985 | if ((p->flags & IP6_TNL_F_CAP_XMIT) || | |
986 | ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && | |
987 | (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) { | |
988 | struct net_device *ldev = NULL; | |
989 | ||
990 | rcu_read_lock(); | |
991 | if (p->link) | |
992 | ldev = dev_get_by_index_rcu(net, p->link); | |
993 | ||
994 | if (unlikely(!ipv6_chk_addr(net, laddr, ldev, 0))) | |
995 | pr_warn("%s xmit: Local address not yet configured!\n", | |
996 | p->name); | |
997 | else if (!(p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) && | |
998 | !ipv6_addr_is_multicast(raddr) && | |
999 | unlikely(ipv6_chk_addr(net, raddr, NULL, 0))) | |
1000 | pr_warn("%s xmit: Routing loop! Remote address found on this node!\n", | |
1001 | p->name); | |
1002 | else | |
1003 | ret = 1; | |
1004 | rcu_read_unlock(); | |
1005 | } | |
1006 | return ret; | |
1007 | } | |
1008 | EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl); | |
1009 | ||
1010 | /** | |
1011 | * ip6_tnl_xmit - encapsulate packet and send | |
1012 | * @skb: the outgoing socket buffer | |
1013 | * @dev: the outgoing tunnel device | |
1014 | * @dsfield: dscp code for outer header | |
1015 | * @fl6: flow of tunneled packet | |
1016 | * @encap_limit: encapsulation limit | |
1017 | * @pmtu: Path MTU is stored if packet is too big | |
1018 | * @proto: next header value | |
1019 | * | |
1020 | * Description: | |
1021 | * Build new header and do some sanity checks on the packet before sending | |
1022 | * it. | |
1023 | * | |
1024 | * Return: | |
1025 | * 0 on success | |
1026 | * -1 fail | |
1027 | * %-EMSGSIZE message too big. return mtu in this case. | |
1028 | **/ | |
1029 | ||
1030 | int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield, | |
1031 | struct flowi6 *fl6, int encap_limit, __u32 *pmtu, | |
1032 | __u8 proto) | |
1033 | { | |
1034 | struct ip6_tnl *t = netdev_priv(dev); | |
1035 | struct net *net = t->net; | |
1036 | struct net_device_stats *stats = &t->dev->stats; | |
1037 | struct ipv6hdr *ipv6h; | |
1038 | struct ipv6_tel_txoption opt; | |
1039 | struct dst_entry *dst = NULL, *ndst = NULL; | |
1040 | struct net_device *tdev; | |
1041 | int mtu; | |
1042 | unsigned int eth_hlen = t->dev->type == ARPHRD_ETHER ? ETH_HLEN : 0; | |
1043 | unsigned int psh_hlen = sizeof(struct ipv6hdr) + t->encap_hlen; | |
1044 | unsigned int max_headroom = psh_hlen; | |
1045 | bool use_cache = false; | |
1046 | u8 hop_limit; | |
1047 | int err = -1; | |
1048 | ||
1049 | if (t->parms.collect_md) { | |
1050 | hop_limit = skb_tunnel_info(skb)->key.ttl; | |
1051 | goto route_lookup; | |
1052 | } else { | |
1053 | hop_limit = t->parms.hop_limit; | |
1054 | } | |
1055 | ||
1056 | /* NBMA tunnel */ | |
1057 | if (ipv6_addr_any(&t->parms.raddr)) { | |
1058 | if (skb->protocol == htons(ETH_P_IPV6)) { | |
1059 | struct in6_addr *addr6; | |
1060 | struct neighbour *neigh; | |
1061 | int addr_type; | |
1062 | ||
1063 | if (!skb_dst(skb)) | |
1064 | goto tx_err_link_failure; | |
1065 | ||
1066 | neigh = dst_neigh_lookup(skb_dst(skb), | |
1067 | &ipv6_hdr(skb)->daddr); | |
1068 | if (!neigh) | |
1069 | goto tx_err_link_failure; | |
1070 | ||
1071 | addr6 = (struct in6_addr *)&neigh->primary_key; | |
1072 | addr_type = ipv6_addr_type(addr6); | |
1073 | ||
1074 | if (addr_type == IPV6_ADDR_ANY) | |
1075 | addr6 = &ipv6_hdr(skb)->daddr; | |
1076 | ||
1077 | memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr)); | |
1078 | neigh_release(neigh); | |
1079 | } | |
1080 | } else if (t->parms.proto != 0 && !(t->parms.flags & | |
1081 | (IP6_TNL_F_USE_ORIG_TCLASS | | |
1082 | IP6_TNL_F_USE_ORIG_FWMARK))) { | |
1083 | /* enable the cache only if neither the outer protocol nor the | |
1084 | * routing decision depends on the current inner header value | |
1085 | */ | |
1086 | use_cache = true; | |
1087 | } | |
1088 | ||
1089 | if (use_cache) | |
1090 | dst = dst_cache_get(&t->dst_cache); | |
1091 | ||
1092 | if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr)) | |
1093 | goto tx_err_link_failure; | |
1094 | ||
1095 | if (!dst) { | |
1096 | route_lookup: | |
1097 | /* add dsfield to flowlabel for route lookup */ | |
1098 | fl6->flowlabel = ip6_make_flowinfo(dsfield, fl6->flowlabel); | |
1099 | ||
1100 | dst = ip6_route_output(net, NULL, fl6); | |
1101 | ||
1102 | if (dst->error) | |
1103 | goto tx_err_link_failure; | |
1104 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0); | |
1105 | if (IS_ERR(dst)) { | |
1106 | err = PTR_ERR(dst); | |
1107 | dst = NULL; | |
1108 | goto tx_err_link_failure; | |
1109 | } | |
1110 | if (t->parms.collect_md && | |
1111 | ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev, | |
1112 | &fl6->daddr, 0, &fl6->saddr)) | |
1113 | goto tx_err_link_failure; | |
1114 | ndst = dst; | |
1115 | } | |
1116 | ||
1117 | tdev = dst->dev; | |
1118 | ||
1119 | if (tdev == dev) { | |
1120 | stats->collisions++; | |
1121 | net_warn_ratelimited("%s: Local routing loop detected!\n", | |
1122 | t->parms.name); | |
1123 | goto tx_err_dst_release; | |
1124 | } | |
1125 | mtu = dst_mtu(dst) - eth_hlen - psh_hlen - t->tun_hlen; | |
1126 | if (encap_limit >= 0) { | |
1127 | max_headroom += 8; | |
1128 | mtu -= 8; | |
1129 | } | |
1130 | mtu = max(mtu, skb->protocol == htons(ETH_P_IPV6) ? | |
1131 | IPV6_MIN_MTU : IPV4_MIN_MTU); | |
1132 | ||
1133 | skb_dst_update_pmtu_no_confirm(skb, mtu); | |
1134 | if (skb->len - t->tun_hlen - eth_hlen > mtu && !skb_is_gso(skb)) { | |
1135 | *pmtu = mtu; | |
1136 | err = -EMSGSIZE; | |
1137 | goto tx_err_dst_release; | |
1138 | } | |
1139 | ||
1140 | if (t->err_count > 0) { | |
1141 | if (time_before(jiffies, | |
1142 | t->err_time + IP6TUNNEL_ERR_TIMEO)) { | |
1143 | t->err_count--; | |
1144 | ||
1145 | dst_link_failure(skb); | |
1146 | } else { | |
1147 | t->err_count = 0; | |
1148 | } | |
1149 | } | |
1150 | ||
1151 | skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev))); | |
1152 | ||
1153 | /* | |
1154 | * Okay, now see if we can stuff it in the buffer as-is. | |
1155 | */ | |
1156 | max_headroom += LL_RESERVED_SPACE(tdev); | |
1157 | ||
1158 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || | |
1159 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1160 | struct sk_buff *new_skb; | |
1161 | ||
1162 | new_skb = skb_realloc_headroom(skb, max_headroom); | |
1163 | if (!new_skb) | |
1164 | goto tx_err_dst_release; | |
1165 | ||
1166 | if (skb->sk) | |
1167 | skb_set_owner_w(new_skb, skb->sk); | |
1168 | consume_skb(skb); | |
1169 | skb = new_skb; | |
1170 | } | |
1171 | ||
1172 | if (t->parms.collect_md) { | |
1173 | if (t->encap.type != TUNNEL_ENCAP_NONE) | |
1174 | goto tx_err_dst_release; | |
1175 | } else { | |
1176 | if (use_cache && ndst) | |
1177 | dst_cache_set_ip6(&t->dst_cache, ndst, &fl6->saddr); | |
1178 | } | |
1179 | skb_dst_set(skb, dst); | |
1180 | ||
1181 | hop_limit = hop_limit ? : ip6_dst_hoplimit(dst); | |
1182 | ||
1183 | /* Calculate max headroom for all the headers and adjust | |
1184 | * needed_headroom if necessary. | |
1185 | */ | |
1186 | max_headroom = LL_RESERVED_SPACE(dst->dev) + sizeof(struct ipv6hdr) | |
1187 | + dst->header_len + t->hlen; | |
1188 | if (max_headroom > dev->needed_headroom) | |
1189 | dev->needed_headroom = max_headroom; | |
1190 | ||
1191 | err = ip6_tnl_encap(skb, t, &proto, fl6); | |
1192 | if (err) | |
1193 | return err; | |
1194 | ||
1195 | if (encap_limit >= 0) { | |
1196 | init_tel_txopt(&opt, encap_limit); | |
1197 | ipv6_push_frag_opts(skb, &opt.ops, &proto); | |
1198 | } | |
1199 | ||
1200 | skb_push(skb, sizeof(struct ipv6hdr)); | |
1201 | skb_reset_network_header(skb); | |
1202 | ipv6h = ipv6_hdr(skb); | |
1203 | ip6_flow_hdr(ipv6h, dsfield, | |
1204 | ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6)); | |
1205 | ipv6h->hop_limit = hop_limit; | |
1206 | ipv6h->nexthdr = proto; | |
1207 | ipv6h->saddr = fl6->saddr; | |
1208 | ipv6h->daddr = fl6->daddr; | |
1209 | ip6tunnel_xmit(NULL, skb, dev); | |
1210 | return 0; | |
1211 | tx_err_link_failure: | |
1212 | stats->tx_carrier_errors++; | |
1213 | dst_link_failure(skb); | |
1214 | tx_err_dst_release: | |
1215 | dst_release(dst); | |
1216 | return err; | |
1217 | } | |
1218 | EXPORT_SYMBOL(ip6_tnl_xmit); | |
1219 | ||
1220 | static inline int | |
1221 | ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1222 | { | |
1223 | struct ip6_tnl *t = netdev_priv(dev); | |
1224 | const struct iphdr *iph; | |
1225 | int encap_limit = -1; | |
1226 | struct flowi6 fl6; | |
1227 | __u8 dsfield; | |
1228 | __u32 mtu; | |
1229 | u8 tproto; | |
1230 | int err; | |
1231 | ||
1232 | iph = ip_hdr(skb); | |
1233 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); | |
1234 | ||
1235 | tproto = READ_ONCE(t->parms.proto); | |
1236 | if (tproto != IPPROTO_IPIP && tproto != 0) | |
1237 | return -1; | |
1238 | ||
1239 | if (t->parms.collect_md) { | |
1240 | struct ip_tunnel_info *tun_info; | |
1241 | const struct ip_tunnel_key *key; | |
1242 | ||
1243 | tun_info = skb_tunnel_info(skb); | |
1244 | if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || | |
1245 | ip_tunnel_info_af(tun_info) != AF_INET6)) | |
1246 | return -1; | |
1247 | key = &tun_info->key; | |
1248 | memset(&fl6, 0, sizeof(fl6)); | |
1249 | fl6.flowi6_proto = IPPROTO_IPIP; | |
1250 | fl6.daddr = key->u.ipv6.dst; | |
1251 | fl6.flowlabel = key->label; | |
1252 | dsfield = key->tos; | |
1253 | } else { | |
1254 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1255 | encap_limit = t->parms.encap_limit; | |
1256 | ||
1257 | memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); | |
1258 | fl6.flowi6_proto = IPPROTO_IPIP; | |
1259 | ||
1260 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) | |
1261 | dsfield = ipv4_get_dsfield(iph); | |
1262 | else | |
1263 | dsfield = ip6_tclass(t->parms.flowinfo); | |
1264 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) | |
1265 | fl6.flowi6_mark = skb->mark; | |
1266 | else | |
1267 | fl6.flowi6_mark = t->parms.fwmark; | |
1268 | } | |
1269 | ||
1270 | fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); | |
1271 | dsfield = INET_ECN_encapsulate(dsfield, ipv4_get_dsfield(iph)); | |
1272 | ||
1273 | if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6)) | |
1274 | return -1; | |
1275 | ||
1276 | skb_set_inner_ipproto(skb, IPPROTO_IPIP); | |
1277 | ||
1278 | err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, | |
1279 | IPPROTO_IPIP); | |
1280 | if (err != 0) { | |
1281 | /* XXX: send ICMP error even if DF is not set. */ | |
1282 | if (err == -EMSGSIZE) | |
1283 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
1284 | htonl(mtu)); | |
1285 | return -1; | |
1286 | } | |
1287 | ||
1288 | return 0; | |
1289 | } | |
1290 | ||
1291 | static inline int | |
1292 | ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
1293 | { | |
1294 | struct ip6_tnl *t = netdev_priv(dev); | |
1295 | struct ipv6hdr *ipv6h; | |
1296 | int encap_limit = -1; | |
1297 | __u16 offset; | |
1298 | struct flowi6 fl6; | |
1299 | __u8 dsfield; | |
1300 | __u32 mtu; | |
1301 | u8 tproto; | |
1302 | int err; | |
1303 | ||
1304 | ipv6h = ipv6_hdr(skb); | |
1305 | tproto = READ_ONCE(t->parms.proto); | |
1306 | if ((tproto != IPPROTO_IPV6 && tproto != 0) || | |
1307 | ip6_tnl_addr_conflict(t, ipv6h)) | |
1308 | return -1; | |
1309 | ||
1310 | if (t->parms.collect_md) { | |
1311 | struct ip_tunnel_info *tun_info; | |
1312 | const struct ip_tunnel_key *key; | |
1313 | ||
1314 | tun_info = skb_tunnel_info(skb); | |
1315 | if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || | |
1316 | ip_tunnel_info_af(tun_info) != AF_INET6)) | |
1317 | return -1; | |
1318 | key = &tun_info->key; | |
1319 | memset(&fl6, 0, sizeof(fl6)); | |
1320 | fl6.flowi6_proto = IPPROTO_IPV6; | |
1321 | fl6.daddr = key->u.ipv6.dst; | |
1322 | fl6.flowlabel = key->label; | |
1323 | dsfield = key->tos; | |
1324 | } else { | |
1325 | offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); | |
1326 | /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */ | |
1327 | ipv6h = ipv6_hdr(skb); | |
1328 | if (offset > 0) { | |
1329 | struct ipv6_tlv_tnl_enc_lim *tel; | |
1330 | ||
1331 | tel = (void *)&skb_network_header(skb)[offset]; | |
1332 | if (tel->encap_limit == 0) { | |
1333 | icmpv6_send(skb, ICMPV6_PARAMPROB, | |
1334 | ICMPV6_HDR_FIELD, offset + 2); | |
1335 | return -1; | |
1336 | } | |
1337 | encap_limit = tel->encap_limit - 1; | |
1338 | } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) { | |
1339 | encap_limit = t->parms.encap_limit; | |
1340 | } | |
1341 | ||
1342 | memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); | |
1343 | fl6.flowi6_proto = IPPROTO_IPV6; | |
1344 | ||
1345 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) | |
1346 | dsfield = ipv6_get_dsfield(ipv6h); | |
1347 | else | |
1348 | dsfield = ip6_tclass(t->parms.flowinfo); | |
1349 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) | |
1350 | fl6.flowlabel |= ip6_flowlabel(ipv6h); | |
1351 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) | |
1352 | fl6.flowi6_mark = skb->mark; | |
1353 | else | |
1354 | fl6.flowi6_mark = t->parms.fwmark; | |
1355 | } | |
1356 | ||
1357 | fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); | |
1358 | dsfield = INET_ECN_encapsulate(dsfield, ipv6_get_dsfield(ipv6h)); | |
1359 | ||
1360 | if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6)) | |
1361 | return -1; | |
1362 | ||
1363 | skb_set_inner_ipproto(skb, IPPROTO_IPV6); | |
1364 | ||
1365 | err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, | |
1366 | IPPROTO_IPV6); | |
1367 | if (err != 0) { | |
1368 | if (err == -EMSGSIZE) | |
1369 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); | |
1370 | return -1; | |
1371 | } | |
1372 | ||
1373 | return 0; | |
1374 | } | |
1375 | ||
1376 | static netdev_tx_t | |
1377 | ip6_tnl_start_xmit(struct sk_buff *skb, struct net_device *dev) | |
1378 | { | |
1379 | struct ip6_tnl *t = netdev_priv(dev); | |
1380 | struct net_device_stats *stats = &t->dev->stats; | |
1381 | int ret; | |
1382 | ||
1383 | if (!pskb_inet_may_pull(skb)) | |
1384 | goto tx_err; | |
1385 | ||
1386 | switch (skb->protocol) { | |
1387 | case htons(ETH_P_IP): | |
1388 | ret = ip4ip6_tnl_xmit(skb, dev); | |
1389 | break; | |
1390 | case htons(ETH_P_IPV6): | |
1391 | ret = ip6ip6_tnl_xmit(skb, dev); | |
1392 | break; | |
1393 | default: | |
1394 | goto tx_err; | |
1395 | } | |
1396 | ||
1397 | if (ret < 0) | |
1398 | goto tx_err; | |
1399 | ||
1400 | return NETDEV_TX_OK; | |
1401 | ||
1402 | tx_err: | |
1403 | stats->tx_errors++; | |
1404 | stats->tx_dropped++; | |
1405 | kfree_skb(skb); | |
1406 | return NETDEV_TX_OK; | |
1407 | } | |
1408 | ||
1409 | static void ip6_tnl_link_config(struct ip6_tnl *t) | |
1410 | { | |
1411 | struct net_device *dev = t->dev; | |
1412 | struct __ip6_tnl_parm *p = &t->parms; | |
1413 | struct flowi6 *fl6 = &t->fl.u.ip6; | |
1414 | int t_hlen; | |
1415 | ||
1416 | memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); | |
1417 | memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
1418 | ||
1419 | /* Set up flowi template */ | |
1420 | fl6->saddr = p->laddr; | |
1421 | fl6->daddr = p->raddr; | |
1422 | fl6->flowi6_oif = p->link; | |
1423 | fl6->flowlabel = 0; | |
1424 | ||
1425 | if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) | |
1426 | fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; | |
1427 | if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) | |
1428 | fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; | |
1429 | ||
1430 | p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); | |
1431 | p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); | |
1432 | ||
1433 | if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) | |
1434 | dev->flags |= IFF_POINTOPOINT; | |
1435 | else | |
1436 | dev->flags &= ~IFF_POINTOPOINT; | |
1437 | ||
1438 | t->tun_hlen = 0; | |
1439 | t->hlen = t->encap_hlen + t->tun_hlen; | |
1440 | t_hlen = t->hlen + sizeof(struct ipv6hdr); | |
1441 | ||
1442 | if (p->flags & IP6_TNL_F_CAP_XMIT) { | |
1443 | int strict = (ipv6_addr_type(&p->raddr) & | |
1444 | (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); | |
1445 | ||
1446 | struct rt6_info *rt = rt6_lookup(t->net, | |
1447 | &p->raddr, &p->laddr, | |
1448 | p->link, strict); | |
1449 | ||
1450 | if (!rt) | |
1451 | return; | |
1452 | ||
1453 | if (rt->dst.dev) { | |
1454 | dev->hard_header_len = rt->dst.dev->hard_header_len + | |
1455 | t_hlen; | |
1456 | ||
1457 | dev->mtu = rt->dst.dev->mtu - t_hlen; | |
1458 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1459 | dev->mtu -= 8; | |
1460 | ||
1461 | if (dev->mtu < IPV6_MIN_MTU) | |
1462 | dev->mtu = IPV6_MIN_MTU; | |
1463 | } | |
1464 | ip6_rt_put(rt); | |
1465 | } | |
1466 | } | |
1467 | ||
1468 | /** | |
1469 | * ip6_tnl_change - update the tunnel parameters | |
1470 | * @t: tunnel to be changed | |
1471 | * @p: tunnel configuration parameters | |
1472 | * | |
1473 | * Description: | |
1474 | * ip6_tnl_change() updates the tunnel parameters | |
1475 | **/ | |
1476 | ||
1477 | static int | |
1478 | ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) | |
1479 | { | |
1480 | t->parms.laddr = p->laddr; | |
1481 | t->parms.raddr = p->raddr; | |
1482 | t->parms.flags = p->flags; | |
1483 | t->parms.hop_limit = p->hop_limit; | |
1484 | t->parms.encap_limit = p->encap_limit; | |
1485 | t->parms.flowinfo = p->flowinfo; | |
1486 | t->parms.link = p->link; | |
1487 | t->parms.proto = p->proto; | |
1488 | t->parms.fwmark = p->fwmark; | |
1489 | dst_cache_reset(&t->dst_cache); | |
1490 | ip6_tnl_link_config(t); | |
1491 | return 0; | |
1492 | } | |
1493 | ||
1494 | static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) | |
1495 | { | |
1496 | struct net *net = t->net; | |
1497 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1498 | int err; | |
1499 | ||
1500 | ip6_tnl_unlink(ip6n, t); | |
1501 | synchronize_net(); | |
1502 | err = ip6_tnl_change(t, p); | |
1503 | ip6_tnl_link(ip6n, t); | |
1504 | netdev_state_change(t->dev); | |
1505 | return err; | |
1506 | } | |
1507 | ||
1508 | static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) | |
1509 | { | |
1510 | /* for default tnl0 device allow to change only the proto */ | |
1511 | t->parms.proto = p->proto; | |
1512 | netdev_state_change(t->dev); | |
1513 | return 0; | |
1514 | } | |
1515 | ||
1516 | static void | |
1517 | ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u) | |
1518 | { | |
1519 | p->laddr = u->laddr; | |
1520 | p->raddr = u->raddr; | |
1521 | p->flags = u->flags; | |
1522 | p->hop_limit = u->hop_limit; | |
1523 | p->encap_limit = u->encap_limit; | |
1524 | p->flowinfo = u->flowinfo; | |
1525 | p->link = u->link; | |
1526 | p->proto = u->proto; | |
1527 | memcpy(p->name, u->name, sizeof(u->name)); | |
1528 | } | |
1529 | ||
1530 | static void | |
1531 | ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p) | |
1532 | { | |
1533 | u->laddr = p->laddr; | |
1534 | u->raddr = p->raddr; | |
1535 | u->flags = p->flags; | |
1536 | u->hop_limit = p->hop_limit; | |
1537 | u->encap_limit = p->encap_limit; | |
1538 | u->flowinfo = p->flowinfo; | |
1539 | u->link = p->link; | |
1540 | u->proto = p->proto; | |
1541 | memcpy(u->name, p->name, sizeof(u->name)); | |
1542 | } | |
1543 | ||
1544 | /** | |
1545 | * ip6_tnl_ioctl - configure ipv6 tunnels from userspace | |
1546 | * @dev: virtual device associated with tunnel | |
1547 | * @ifr: parameters passed from userspace | |
1548 | * @cmd: command to be performed | |
1549 | * | |
1550 | * Description: | |
1551 | * ip6_tnl_ioctl() is used for managing IPv6 tunnels | |
1552 | * from userspace. | |
1553 | * | |
1554 | * The possible commands are the following: | |
1555 | * %SIOCGETTUNNEL: get tunnel parameters for device | |
1556 | * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters | |
1557 | * %SIOCCHGTUNNEL: change tunnel parameters to those given | |
1558 | * %SIOCDELTUNNEL: delete tunnel | |
1559 | * | |
1560 | * The fallback device "ip6tnl0", created during module | |
1561 | * initialization, can be used for creating other tunnel devices. | |
1562 | * | |
1563 | * Return: | |
1564 | * 0 on success, | |
1565 | * %-EFAULT if unable to copy data to or from userspace, | |
1566 | * %-EPERM if current process hasn't %CAP_NET_ADMIN set | |
1567 | * %-EINVAL if passed tunnel parameters are invalid, | |
1568 | * %-EEXIST if changing a tunnel's parameters would cause a conflict | |
1569 | * %-ENODEV if attempting to change or delete a nonexisting device | |
1570 | **/ | |
1571 | ||
1572 | static int | |
1573 | ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) | |
1574 | { | |
1575 | int err = 0; | |
1576 | struct ip6_tnl_parm p; | |
1577 | struct __ip6_tnl_parm p1; | |
1578 | struct ip6_tnl *t = netdev_priv(dev); | |
1579 | struct net *net = t->net; | |
1580 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1581 | ||
1582 | memset(&p1, 0, sizeof(p1)); | |
1583 | ||
1584 | switch (cmd) { | |
1585 | case SIOCGETTUNNEL: | |
1586 | if (dev == ip6n->fb_tnl_dev) { | |
1587 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { | |
1588 | err = -EFAULT; | |
1589 | break; | |
1590 | } | |
1591 | ip6_tnl_parm_from_user(&p1, &p); | |
1592 | t = ip6_tnl_locate(net, &p1, 0); | |
1593 | if (IS_ERR(t)) | |
1594 | t = netdev_priv(dev); | |
1595 | } else { | |
1596 | memset(&p, 0, sizeof(p)); | |
1597 | } | |
1598 | ip6_tnl_parm_to_user(&p, &t->parms); | |
1599 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) { | |
1600 | err = -EFAULT; | |
1601 | } | |
1602 | break; | |
1603 | case SIOCADDTUNNEL: | |
1604 | case SIOCCHGTUNNEL: | |
1605 | err = -EPERM; | |
1606 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
1607 | break; | |
1608 | err = -EFAULT; | |
1609 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1610 | break; | |
1611 | err = -EINVAL; | |
1612 | if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && | |
1613 | p.proto != 0) | |
1614 | break; | |
1615 | ip6_tnl_parm_from_user(&p1, &p); | |
1616 | t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL); | |
1617 | if (cmd == SIOCCHGTUNNEL) { | |
1618 | if (!IS_ERR(t)) { | |
1619 | if (t->dev != dev) { | |
1620 | err = -EEXIST; | |
1621 | break; | |
1622 | } | |
1623 | } else | |
1624 | t = netdev_priv(dev); | |
1625 | if (dev == ip6n->fb_tnl_dev) | |
1626 | err = ip6_tnl0_update(t, &p1); | |
1627 | else | |
1628 | err = ip6_tnl_update(t, &p1); | |
1629 | } | |
1630 | if (!IS_ERR(t)) { | |
1631 | err = 0; | |
1632 | ip6_tnl_parm_to_user(&p, &t->parms); | |
1633 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
1634 | err = -EFAULT; | |
1635 | ||
1636 | } else { | |
1637 | err = PTR_ERR(t); | |
1638 | } | |
1639 | break; | |
1640 | case SIOCDELTUNNEL: | |
1641 | err = -EPERM; | |
1642 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
1643 | break; | |
1644 | ||
1645 | if (dev == ip6n->fb_tnl_dev) { | |
1646 | err = -EFAULT; | |
1647 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1648 | break; | |
1649 | err = -ENOENT; | |
1650 | ip6_tnl_parm_from_user(&p1, &p); | |
1651 | t = ip6_tnl_locate(net, &p1, 0); | |
1652 | if (IS_ERR(t)) | |
1653 | break; | |
1654 | err = -EPERM; | |
1655 | if (t->dev == ip6n->fb_tnl_dev) | |
1656 | break; | |
1657 | dev = t->dev; | |
1658 | } | |
1659 | err = 0; | |
1660 | unregister_netdevice(dev); | |
1661 | break; | |
1662 | default: | |
1663 | err = -EINVAL; | |
1664 | } | |
1665 | return err; | |
1666 | } | |
1667 | ||
1668 | /** | |
1669 | * ip6_tnl_change_mtu - change mtu manually for tunnel device | |
1670 | * @dev: virtual device associated with tunnel | |
1671 | * @new_mtu: the new mtu | |
1672 | * | |
1673 | * Return: | |
1674 | * 0 on success, | |
1675 | * %-EINVAL if mtu too small | |
1676 | **/ | |
1677 | ||
1678 | int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) | |
1679 | { | |
1680 | struct ip6_tnl *tnl = netdev_priv(dev); | |
1681 | ||
1682 | if (tnl->parms.proto == IPPROTO_IPV6) { | |
1683 | if (new_mtu < IPV6_MIN_MTU) | |
1684 | return -EINVAL; | |
1685 | } else { | |
1686 | if (new_mtu < ETH_MIN_MTU) | |
1687 | return -EINVAL; | |
1688 | } | |
1689 | if (tnl->parms.proto == IPPROTO_IPV6 || tnl->parms.proto == 0) { | |
1690 | if (new_mtu > IP6_MAX_MTU - dev->hard_header_len) | |
1691 | return -EINVAL; | |
1692 | } else { | |
1693 | if (new_mtu > IP_MAX_MTU - dev->hard_header_len) | |
1694 | return -EINVAL; | |
1695 | } | |
1696 | dev->mtu = new_mtu; | |
1697 | return 0; | |
1698 | } | |
1699 | EXPORT_SYMBOL(ip6_tnl_change_mtu); | |
1700 | ||
1701 | int ip6_tnl_get_iflink(const struct net_device *dev) | |
1702 | { | |
1703 | struct ip6_tnl *t = netdev_priv(dev); | |
1704 | ||
1705 | return t->parms.link; | |
1706 | } | |
1707 | EXPORT_SYMBOL(ip6_tnl_get_iflink); | |
1708 | ||
1709 | int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops, | |
1710 | unsigned int num) | |
1711 | { | |
1712 | if (num >= MAX_IPTUN_ENCAP_OPS) | |
1713 | return -ERANGE; | |
1714 | ||
1715 | return !cmpxchg((const struct ip6_tnl_encap_ops **) | |
1716 | &ip6tun_encaps[num], | |
1717 | NULL, ops) ? 0 : -1; | |
1718 | } | |
1719 | EXPORT_SYMBOL(ip6_tnl_encap_add_ops); | |
1720 | ||
1721 | int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops, | |
1722 | unsigned int num) | |
1723 | { | |
1724 | int ret; | |
1725 | ||
1726 | if (num >= MAX_IPTUN_ENCAP_OPS) | |
1727 | return -ERANGE; | |
1728 | ||
1729 | ret = (cmpxchg((const struct ip6_tnl_encap_ops **) | |
1730 | &ip6tun_encaps[num], | |
1731 | ops, NULL) == ops) ? 0 : -1; | |
1732 | ||
1733 | synchronize_net(); | |
1734 | ||
1735 | return ret; | |
1736 | } | |
1737 | EXPORT_SYMBOL(ip6_tnl_encap_del_ops); | |
1738 | ||
1739 | int ip6_tnl_encap_setup(struct ip6_tnl *t, | |
1740 | struct ip_tunnel_encap *ipencap) | |
1741 | { | |
1742 | int hlen; | |
1743 | ||
1744 | memset(&t->encap, 0, sizeof(t->encap)); | |
1745 | ||
1746 | hlen = ip6_encap_hlen(ipencap); | |
1747 | if (hlen < 0) | |
1748 | return hlen; | |
1749 | ||
1750 | t->encap.type = ipencap->type; | |
1751 | t->encap.sport = ipencap->sport; | |
1752 | t->encap.dport = ipencap->dport; | |
1753 | t->encap.flags = ipencap->flags; | |
1754 | ||
1755 | t->encap_hlen = hlen; | |
1756 | t->hlen = t->encap_hlen + t->tun_hlen; | |
1757 | ||
1758 | return 0; | |
1759 | } | |
1760 | EXPORT_SYMBOL_GPL(ip6_tnl_encap_setup); | |
1761 | ||
1762 | static const struct net_device_ops ip6_tnl_netdev_ops = { | |
1763 | .ndo_init = ip6_tnl_dev_init, | |
1764 | .ndo_uninit = ip6_tnl_dev_uninit, | |
1765 | .ndo_start_xmit = ip6_tnl_start_xmit, | |
1766 | .ndo_do_ioctl = ip6_tnl_ioctl, | |
1767 | .ndo_change_mtu = ip6_tnl_change_mtu, | |
1768 | .ndo_get_stats = ip6_get_stats, | |
1769 | .ndo_get_iflink = ip6_tnl_get_iflink, | |
1770 | }; | |
1771 | ||
1772 | #define IPXIPX_FEATURES (NETIF_F_SG | \ | |
1773 | NETIF_F_FRAGLIST | \ | |
1774 | NETIF_F_HIGHDMA | \ | |
1775 | NETIF_F_GSO_SOFTWARE | \ | |
1776 | NETIF_F_HW_CSUM) | |
1777 | ||
1778 | /** | |
1779 | * ip6_tnl_dev_setup - setup virtual tunnel device | |
1780 | * @dev: virtual device associated with tunnel | |
1781 | * | |
1782 | * Description: | |
1783 | * Initialize function pointers and device parameters | |
1784 | **/ | |
1785 | ||
1786 | static void ip6_tnl_dev_setup(struct net_device *dev) | |
1787 | { | |
1788 | dev->netdev_ops = &ip6_tnl_netdev_ops; | |
1789 | dev->needs_free_netdev = true; | |
1790 | dev->priv_destructor = ip6_dev_free; | |
1791 | ||
1792 | dev->type = ARPHRD_TUNNEL6; | |
1793 | dev->flags |= IFF_NOARP; | |
1794 | dev->addr_len = sizeof(struct in6_addr); | |
1795 | dev->features |= NETIF_F_LLTX; | |
1796 | netif_keep_dst(dev); | |
1797 | ||
1798 | dev->features |= IPXIPX_FEATURES; | |
1799 | dev->hw_features |= IPXIPX_FEATURES; | |
1800 | ||
1801 | /* This perm addr will be used as interface identifier by IPv6 */ | |
1802 | dev->addr_assign_type = NET_ADDR_RANDOM; | |
1803 | eth_random_addr(dev->perm_addr); | |
1804 | } | |
1805 | ||
1806 | ||
1807 | /** | |
1808 | * ip6_tnl_dev_init_gen - general initializer for all tunnel devices | |
1809 | * @dev: virtual device associated with tunnel | |
1810 | **/ | |
1811 | ||
1812 | static inline int | |
1813 | ip6_tnl_dev_init_gen(struct net_device *dev) | |
1814 | { | |
1815 | struct ip6_tnl *t = netdev_priv(dev); | |
1816 | int ret; | |
1817 | int t_hlen; | |
1818 | ||
1819 | t->dev = dev; | |
1820 | t->net = dev_net(dev); | |
1821 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); | |
1822 | if (!dev->tstats) | |
1823 | return -ENOMEM; | |
1824 | ||
1825 | ret = dst_cache_init(&t->dst_cache, GFP_KERNEL); | |
1826 | if (ret) | |
1827 | goto free_stats; | |
1828 | ||
1829 | ret = gro_cells_init(&t->gro_cells, dev); | |
1830 | if (ret) | |
1831 | goto destroy_dst; | |
1832 | ||
1833 | t->tun_hlen = 0; | |
1834 | t->hlen = t->encap_hlen + t->tun_hlen; | |
1835 | t_hlen = t->hlen + sizeof(struct ipv6hdr); | |
1836 | ||
1837 | dev->type = ARPHRD_TUNNEL6; | |
1838 | dev->hard_header_len = LL_MAX_HEADER + t_hlen; | |
1839 | dev->mtu = ETH_DATA_LEN - t_hlen; | |
1840 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
1841 | dev->mtu -= 8; | |
1842 | dev->min_mtu = ETH_MIN_MTU; | |
1843 | dev->max_mtu = IP6_MAX_MTU - dev->hard_header_len; | |
1844 | ||
1845 | return 0; | |
1846 | ||
1847 | destroy_dst: | |
1848 | dst_cache_destroy(&t->dst_cache); | |
1849 | free_stats: | |
1850 | free_percpu(dev->tstats); | |
1851 | dev->tstats = NULL; | |
1852 | ||
1853 | return ret; | |
1854 | } | |
1855 | ||
1856 | /** | |
1857 | * ip6_tnl_dev_init - initializer for all non fallback tunnel devices | |
1858 | * @dev: virtual device associated with tunnel | |
1859 | **/ | |
1860 | ||
1861 | static int ip6_tnl_dev_init(struct net_device *dev) | |
1862 | { | |
1863 | struct ip6_tnl *t = netdev_priv(dev); | |
1864 | int err = ip6_tnl_dev_init_gen(dev); | |
1865 | ||
1866 | if (err) | |
1867 | return err; | |
1868 | ip6_tnl_link_config(t); | |
1869 | if (t->parms.collect_md) | |
1870 | netif_keep_dst(dev); | |
1871 | return 0; | |
1872 | } | |
1873 | ||
1874 | /** | |
1875 | * ip6_fb_tnl_dev_init - initializer for fallback tunnel device | |
1876 | * @dev: fallback device | |
1877 | * | |
1878 | * Return: 0 | |
1879 | **/ | |
1880 | ||
1881 | static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev) | |
1882 | { | |
1883 | struct ip6_tnl *t = netdev_priv(dev); | |
1884 | struct net *net = dev_net(dev); | |
1885 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1886 | ||
1887 | t->parms.proto = IPPROTO_IPV6; | |
1888 | dev_hold(dev); | |
1889 | ||
1890 | rcu_assign_pointer(ip6n->tnls_wc[0], t); | |
1891 | return 0; | |
1892 | } | |
1893 | ||
1894 | static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[], | |
1895 | struct netlink_ext_ack *extack) | |
1896 | { | |
1897 | u8 proto; | |
1898 | ||
1899 | if (!data || !data[IFLA_IPTUN_PROTO]) | |
1900 | return 0; | |
1901 | ||
1902 | proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1903 | if (proto != IPPROTO_IPV6 && | |
1904 | proto != IPPROTO_IPIP && | |
1905 | proto != 0) | |
1906 | return -EINVAL; | |
1907 | ||
1908 | return 0; | |
1909 | } | |
1910 | ||
1911 | static void ip6_tnl_netlink_parms(struct nlattr *data[], | |
1912 | struct __ip6_tnl_parm *parms) | |
1913 | { | |
1914 | memset(parms, 0, sizeof(*parms)); | |
1915 | ||
1916 | if (!data) | |
1917 | return; | |
1918 | ||
1919 | if (data[IFLA_IPTUN_LINK]) | |
1920 | parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); | |
1921 | ||
1922 | if (data[IFLA_IPTUN_LOCAL]) | |
1923 | parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]); | |
1924 | ||
1925 | if (data[IFLA_IPTUN_REMOTE]) | |
1926 | parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]); | |
1927 | ||
1928 | if (data[IFLA_IPTUN_TTL]) | |
1929 | parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]); | |
1930 | ||
1931 | if (data[IFLA_IPTUN_ENCAP_LIMIT]) | |
1932 | parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]); | |
1933 | ||
1934 | if (data[IFLA_IPTUN_FLOWINFO]) | |
1935 | parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]); | |
1936 | ||
1937 | if (data[IFLA_IPTUN_FLAGS]) | |
1938 | parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]); | |
1939 | ||
1940 | if (data[IFLA_IPTUN_PROTO]) | |
1941 | parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1942 | ||
1943 | if (data[IFLA_IPTUN_COLLECT_METADATA]) | |
1944 | parms->collect_md = true; | |
1945 | ||
1946 | if (data[IFLA_IPTUN_FWMARK]) | |
1947 | parms->fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); | |
1948 | } | |
1949 | ||
1950 | static bool ip6_tnl_netlink_encap_parms(struct nlattr *data[], | |
1951 | struct ip_tunnel_encap *ipencap) | |
1952 | { | |
1953 | bool ret = false; | |
1954 | ||
1955 | memset(ipencap, 0, sizeof(*ipencap)); | |
1956 | ||
1957 | if (!data) | |
1958 | return ret; | |
1959 | ||
1960 | if (data[IFLA_IPTUN_ENCAP_TYPE]) { | |
1961 | ret = true; | |
1962 | ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); | |
1963 | } | |
1964 | ||
1965 | if (data[IFLA_IPTUN_ENCAP_FLAGS]) { | |
1966 | ret = true; | |
1967 | ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); | |
1968 | } | |
1969 | ||
1970 | if (data[IFLA_IPTUN_ENCAP_SPORT]) { | |
1971 | ret = true; | |
1972 | ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); | |
1973 | } | |
1974 | ||
1975 | if (data[IFLA_IPTUN_ENCAP_DPORT]) { | |
1976 | ret = true; | |
1977 | ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); | |
1978 | } | |
1979 | ||
1980 | return ret; | |
1981 | } | |
1982 | ||
1983 | static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev, | |
1984 | struct nlattr *tb[], struct nlattr *data[], | |
1985 | struct netlink_ext_ack *extack) | |
1986 | { | |
1987 | struct net *net = dev_net(dev); | |
1988 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
1989 | struct ip_tunnel_encap ipencap; | |
1990 | struct ip6_tnl *nt, *t; | |
1991 | int err; | |
1992 | ||
1993 | nt = netdev_priv(dev); | |
1994 | ||
1995 | if (ip6_tnl_netlink_encap_parms(data, &ipencap)) { | |
1996 | err = ip6_tnl_encap_setup(nt, &ipencap); | |
1997 | if (err < 0) | |
1998 | return err; | |
1999 | } | |
2000 | ||
2001 | ip6_tnl_netlink_parms(data, &nt->parms); | |
2002 | ||
2003 | if (nt->parms.collect_md) { | |
2004 | if (rtnl_dereference(ip6n->collect_md_tun)) | |
2005 | return -EEXIST; | |
2006 | } else { | |
2007 | t = ip6_tnl_locate(net, &nt->parms, 0); | |
2008 | if (!IS_ERR(t)) | |
2009 | return -EEXIST; | |
2010 | } | |
2011 | ||
2012 | err = ip6_tnl_create2(dev); | |
2013 | if (!err && tb[IFLA_MTU]) | |
2014 | ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); | |
2015 | ||
2016 | return err; | |
2017 | } | |
2018 | ||
2019 | static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[], | |
2020 | struct nlattr *data[], | |
2021 | struct netlink_ext_ack *extack) | |
2022 | { | |
2023 | struct ip6_tnl *t = netdev_priv(dev); | |
2024 | struct __ip6_tnl_parm p; | |
2025 | struct net *net = t->net; | |
2026 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
2027 | struct ip_tunnel_encap ipencap; | |
2028 | ||
2029 | if (dev == ip6n->fb_tnl_dev) | |
2030 | return -EINVAL; | |
2031 | ||
2032 | if (ip6_tnl_netlink_encap_parms(data, &ipencap)) { | |
2033 | int err = ip6_tnl_encap_setup(t, &ipencap); | |
2034 | ||
2035 | if (err < 0) | |
2036 | return err; | |
2037 | } | |
2038 | ip6_tnl_netlink_parms(data, &p); | |
2039 | if (p.collect_md) | |
2040 | return -EINVAL; | |
2041 | ||
2042 | t = ip6_tnl_locate(net, &p, 0); | |
2043 | if (!IS_ERR(t)) { | |
2044 | if (t->dev != dev) | |
2045 | return -EEXIST; | |
2046 | } else | |
2047 | t = netdev_priv(dev); | |
2048 | ||
2049 | return ip6_tnl_update(t, &p); | |
2050 | } | |
2051 | ||
2052 | static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head) | |
2053 | { | |
2054 | struct net *net = dev_net(dev); | |
2055 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
2056 | ||
2057 | if (dev != ip6n->fb_tnl_dev) | |
2058 | unregister_netdevice_queue(dev, head); | |
2059 | } | |
2060 | ||
2061 | static size_t ip6_tnl_get_size(const struct net_device *dev) | |
2062 | { | |
2063 | return | |
2064 | /* IFLA_IPTUN_LINK */ | |
2065 | nla_total_size(4) + | |
2066 | /* IFLA_IPTUN_LOCAL */ | |
2067 | nla_total_size(sizeof(struct in6_addr)) + | |
2068 | /* IFLA_IPTUN_REMOTE */ | |
2069 | nla_total_size(sizeof(struct in6_addr)) + | |
2070 | /* IFLA_IPTUN_TTL */ | |
2071 | nla_total_size(1) + | |
2072 | /* IFLA_IPTUN_ENCAP_LIMIT */ | |
2073 | nla_total_size(1) + | |
2074 | /* IFLA_IPTUN_FLOWINFO */ | |
2075 | nla_total_size(4) + | |
2076 | /* IFLA_IPTUN_FLAGS */ | |
2077 | nla_total_size(4) + | |
2078 | /* IFLA_IPTUN_PROTO */ | |
2079 | nla_total_size(1) + | |
2080 | /* IFLA_IPTUN_ENCAP_TYPE */ | |
2081 | nla_total_size(2) + | |
2082 | /* IFLA_IPTUN_ENCAP_FLAGS */ | |
2083 | nla_total_size(2) + | |
2084 | /* IFLA_IPTUN_ENCAP_SPORT */ | |
2085 | nla_total_size(2) + | |
2086 | /* IFLA_IPTUN_ENCAP_DPORT */ | |
2087 | nla_total_size(2) + | |
2088 | /* IFLA_IPTUN_COLLECT_METADATA */ | |
2089 | nla_total_size(0) + | |
2090 | /* IFLA_IPTUN_FWMARK */ | |
2091 | nla_total_size(4) + | |
2092 | 0; | |
2093 | } | |
2094 | ||
2095 | static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
2096 | { | |
2097 | struct ip6_tnl *tunnel = netdev_priv(dev); | |
2098 | struct __ip6_tnl_parm *parm = &tunnel->parms; | |
2099 | ||
2100 | if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || | |
2101 | nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) || | |
2102 | nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) || | |
2103 | nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) || | |
2104 | nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) || | |
2105 | nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) || | |
2106 | nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) || | |
2107 | nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto) || | |
2108 | nla_put_u32(skb, IFLA_IPTUN_FWMARK, parm->fwmark)) | |
2109 | goto nla_put_failure; | |
2110 | ||
2111 | if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, tunnel->encap.type) || | |
2112 | nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, tunnel->encap.sport) || | |
2113 | nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, tunnel->encap.dport) || | |
2114 | nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, tunnel->encap.flags)) | |
2115 | goto nla_put_failure; | |
2116 | ||
2117 | if (parm->collect_md) | |
2118 | if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA)) | |
2119 | goto nla_put_failure; | |
2120 | ||
2121 | return 0; | |
2122 | ||
2123 | nla_put_failure: | |
2124 | return -EMSGSIZE; | |
2125 | } | |
2126 | ||
2127 | struct net *ip6_tnl_get_link_net(const struct net_device *dev) | |
2128 | { | |
2129 | struct ip6_tnl *tunnel = netdev_priv(dev); | |
2130 | ||
2131 | return tunnel->net; | |
2132 | } | |
2133 | EXPORT_SYMBOL(ip6_tnl_get_link_net); | |
2134 | ||
2135 | static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = { | |
2136 | [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, | |
2137 | [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) }, | |
2138 | [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) }, | |
2139 | [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, | |
2140 | [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 }, | |
2141 | [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 }, | |
2142 | [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 }, | |
2143 | [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, | |
2144 | [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, | |
2145 | [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, | |
2146 | [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, | |
2147 | [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, | |
2148 | [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG }, | |
2149 | [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, | |
2150 | }; | |
2151 | ||
2152 | static struct rtnl_link_ops ip6_link_ops __read_mostly = { | |
2153 | .kind = "ip6tnl", | |
2154 | .maxtype = IFLA_IPTUN_MAX, | |
2155 | .policy = ip6_tnl_policy, | |
2156 | .priv_size = sizeof(struct ip6_tnl), | |
2157 | .setup = ip6_tnl_dev_setup, | |
2158 | .validate = ip6_tnl_validate, | |
2159 | .newlink = ip6_tnl_newlink, | |
2160 | .changelink = ip6_tnl_changelink, | |
2161 | .dellink = ip6_tnl_dellink, | |
2162 | .get_size = ip6_tnl_get_size, | |
2163 | .fill_info = ip6_tnl_fill_info, | |
2164 | .get_link_net = ip6_tnl_get_link_net, | |
2165 | }; | |
2166 | ||
2167 | static struct xfrm6_tunnel ip4ip6_handler __read_mostly = { | |
2168 | .handler = ip4ip6_rcv, | |
2169 | .err_handler = ip4ip6_err, | |
2170 | .priority = 1, | |
2171 | }; | |
2172 | ||
2173 | static struct xfrm6_tunnel ip6ip6_handler __read_mostly = { | |
2174 | .handler = ip6ip6_rcv, | |
2175 | .err_handler = ip6ip6_err, | |
2176 | .priority = 1, | |
2177 | }; | |
2178 | ||
2179 | static void __net_exit ip6_tnl_destroy_tunnels(struct net *net, struct list_head *list) | |
2180 | { | |
2181 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
2182 | struct net_device *dev, *aux; | |
2183 | int h; | |
2184 | struct ip6_tnl *t; | |
2185 | ||
2186 | for_each_netdev_safe(net, dev, aux) | |
2187 | if (dev->rtnl_link_ops == &ip6_link_ops) | |
2188 | unregister_netdevice_queue(dev, list); | |
2189 | ||
2190 | for (h = 0; h < IP6_TUNNEL_HASH_SIZE; h++) { | |
2191 | t = rtnl_dereference(ip6n->tnls_r_l[h]); | |
2192 | while (t) { | |
2193 | /* If dev is in the same netns, it has already | |
2194 | * been added to the list by the previous loop. | |
2195 | */ | |
2196 | if (!net_eq(dev_net(t->dev), net)) | |
2197 | unregister_netdevice_queue(t->dev, list); | |
2198 | t = rtnl_dereference(t->next); | |
2199 | } | |
2200 | } | |
2201 | } | |
2202 | ||
2203 | static int __net_init ip6_tnl_init_net(struct net *net) | |
2204 | { | |
2205 | struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); | |
2206 | struct ip6_tnl *t = NULL; | |
2207 | int err; | |
2208 | ||
2209 | ip6n->tnls[0] = ip6n->tnls_wc; | |
2210 | ip6n->tnls[1] = ip6n->tnls_r_l; | |
2211 | ||
2212 | err = -ENOMEM; | |
2213 | ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", | |
2214 | NET_NAME_UNKNOWN, ip6_tnl_dev_setup); | |
2215 | ||
2216 | if (!ip6n->fb_tnl_dev) | |
2217 | goto err_alloc_dev; | |
2218 | dev_net_set(ip6n->fb_tnl_dev, net); | |
2219 | ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops; | |
2220 | /* FB netdevice is special: we have one, and only one per netns. | |
2221 | * Allowing to move it to another netns is clearly unsafe. | |
2222 | */ | |
2223 | ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL; | |
2224 | ||
2225 | err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); | |
2226 | if (err < 0) | |
2227 | goto err_register; | |
2228 | ||
2229 | err = register_netdev(ip6n->fb_tnl_dev); | |
2230 | if (err < 0) | |
2231 | goto err_register; | |
2232 | ||
2233 | t = netdev_priv(ip6n->fb_tnl_dev); | |
2234 | ||
2235 | strcpy(t->parms.name, ip6n->fb_tnl_dev->name); | |
2236 | return 0; | |
2237 | ||
2238 | err_register: | |
2239 | free_netdev(ip6n->fb_tnl_dev); | |
2240 | err_alloc_dev: | |
2241 | return err; | |
2242 | } | |
2243 | ||
2244 | static void __net_exit ip6_tnl_exit_batch_net(struct list_head *net_list) | |
2245 | { | |
2246 | struct net *net; | |
2247 | LIST_HEAD(list); | |
2248 | ||
2249 | rtnl_lock(); | |
2250 | list_for_each_entry(net, net_list, exit_list) | |
2251 | ip6_tnl_destroy_tunnels(net, &list); | |
2252 | unregister_netdevice_many(&list); | |
2253 | rtnl_unlock(); | |
2254 | } | |
2255 | ||
2256 | static struct pernet_operations ip6_tnl_net_ops = { | |
2257 | .init = ip6_tnl_init_net, | |
2258 | .exit_batch = ip6_tnl_exit_batch_net, | |
2259 | .id = &ip6_tnl_net_id, | |
2260 | .size = sizeof(struct ip6_tnl_net), | |
2261 | }; | |
2262 | ||
2263 | /** | |
2264 | * ip6_tunnel_init - register protocol and reserve needed resources | |
2265 | * | |
2266 | * Return: 0 on success | |
2267 | **/ | |
2268 | ||
2269 | static int __init ip6_tunnel_init(void) | |
2270 | { | |
2271 | int err; | |
2272 | ||
2273 | if (!ipv6_mod_enabled()) | |
2274 | return -EOPNOTSUPP; | |
2275 | ||
2276 | err = register_pernet_device(&ip6_tnl_net_ops); | |
2277 | if (err < 0) | |
2278 | goto out_pernet; | |
2279 | ||
2280 | err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET); | |
2281 | if (err < 0) { | |
2282 | pr_err("%s: can't register ip4ip6\n", __func__); | |
2283 | goto out_ip4ip6; | |
2284 | } | |
2285 | ||
2286 | err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6); | |
2287 | if (err < 0) { | |
2288 | pr_err("%s: can't register ip6ip6\n", __func__); | |
2289 | goto out_ip6ip6; | |
2290 | } | |
2291 | err = rtnl_link_register(&ip6_link_ops); | |
2292 | if (err < 0) | |
2293 | goto rtnl_link_failed; | |
2294 | ||
2295 | return 0; | |
2296 | ||
2297 | rtnl_link_failed: | |
2298 | xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6); | |
2299 | out_ip6ip6: | |
2300 | xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); | |
2301 | out_ip4ip6: | |
2302 | unregister_pernet_device(&ip6_tnl_net_ops); | |
2303 | out_pernet: | |
2304 | return err; | |
2305 | } | |
2306 | ||
2307 | /** | |
2308 | * ip6_tunnel_cleanup - free resources and unregister protocol | |
2309 | **/ | |
2310 | ||
2311 | static void __exit ip6_tunnel_cleanup(void) | |
2312 | { | |
2313 | rtnl_link_unregister(&ip6_link_ops); | |
2314 | if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) | |
2315 | pr_info("%s: can't deregister ip4ip6\n", __func__); | |
2316 | ||
2317 | if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) | |
2318 | pr_info("%s: can't deregister ip6ip6\n", __func__); | |
2319 | ||
2320 | unregister_pernet_device(&ip6_tnl_net_ops); | |
2321 | } | |
2322 | ||
2323 | module_init(ip6_tunnel_init); | |
2324 | module_exit(ip6_tunnel_cleanup); |