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1 | /* | |
2 | * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT) | |
3 | * Linux INET6 implementation | |
4 | * | |
5 | * Authors: | |
6 | * Pedro Roque <roque@di.fc.ul.pt> | |
7 | * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | * | |
14 | * Changes: | |
15 | * Roger Venning <r.venning@telstra.com>: 6to4 support | |
16 | * Nate Thompson <nate@thebog.net>: 6to4 support | |
17 | * Fred Templin <fred.l.templin@boeing.com>: isatap support | |
18 | */ | |
19 | ||
20 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
21 | ||
22 | #include <linux/module.h> | |
23 | #include <linux/capability.h> | |
24 | #include <linux/errno.h> | |
25 | #include <linux/types.h> | |
26 | #include <linux/socket.h> | |
27 | #include <linux/sockios.h> | |
28 | #include <linux/net.h> | |
29 | #include <linux/in6.h> | |
30 | #include <linux/netdevice.h> | |
31 | #include <linux/if_arp.h> | |
32 | #include <linux/icmp.h> | |
33 | #include <linux/slab.h> | |
34 | #include <asm/uaccess.h> | |
35 | #include <linux/init.h> | |
36 | #include <linux/netfilter_ipv4.h> | |
37 | #include <linux/if_ether.h> | |
38 | ||
39 | #include <net/sock.h> | |
40 | #include <net/snmp.h> | |
41 | ||
42 | #include <net/ipv6.h> | |
43 | #include <net/protocol.h> | |
44 | #include <net/transp_v6.h> | |
45 | #include <net/ip6_fib.h> | |
46 | #include <net/ip6_route.h> | |
47 | #include <net/ndisc.h> | |
48 | #include <net/addrconf.h> | |
49 | #include <net/ip.h> | |
50 | #include <net/udp.h> | |
51 | #include <net/icmp.h> | |
52 | #include <net/ip_tunnels.h> | |
53 | #include <net/inet_ecn.h> | |
54 | #include <net/xfrm.h> | |
55 | #include <net/dsfield.h> | |
56 | #include <net/net_namespace.h> | |
57 | #include <net/netns/generic.h> | |
58 | ||
59 | /* | |
60 | This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c | |
61 | ||
62 | For comments look at net/ipv4/ip_gre.c --ANK | |
63 | */ | |
64 | ||
65 | #define HASH_SIZE 16 | |
66 | #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) | |
67 | ||
68 | static bool log_ecn_error = true; | |
69 | module_param(log_ecn_error, bool, 0644); | |
70 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); | |
71 | ||
72 | static int ipip6_tunnel_init(struct net_device *dev); | |
73 | static void ipip6_tunnel_setup(struct net_device *dev); | |
74 | static void ipip6_dev_free(struct net_device *dev); | |
75 | static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, | |
76 | __be32 *v4dst); | |
77 | static struct rtnl_link_ops sit_link_ops __read_mostly; | |
78 | ||
79 | static int sit_net_id __read_mostly; | |
80 | struct sit_net { | |
81 | struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE]; | |
82 | struct ip_tunnel __rcu *tunnels_r[HASH_SIZE]; | |
83 | struct ip_tunnel __rcu *tunnels_l[HASH_SIZE]; | |
84 | struct ip_tunnel __rcu *tunnels_wc[1]; | |
85 | struct ip_tunnel __rcu **tunnels[4]; | |
86 | ||
87 | struct net_device *fb_tunnel_dev; | |
88 | }; | |
89 | ||
90 | /* | |
91 | * Must be invoked with rcu_read_lock | |
92 | */ | |
93 | static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net, | |
94 | struct net_device *dev, __be32 remote, __be32 local) | |
95 | { | |
96 | unsigned int h0 = HASH(remote); | |
97 | unsigned int h1 = HASH(local); | |
98 | struct ip_tunnel *t; | |
99 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
100 | ||
101 | for_each_ip_tunnel_rcu(t, sitn->tunnels_r_l[h0 ^ h1]) { | |
102 | if (local == t->parms.iph.saddr && | |
103 | remote == t->parms.iph.daddr && | |
104 | (!dev || !t->parms.link || dev->ifindex == t->parms.link) && | |
105 | (t->dev->flags & IFF_UP)) | |
106 | return t; | |
107 | } | |
108 | for_each_ip_tunnel_rcu(t, sitn->tunnels_r[h0]) { | |
109 | if (remote == t->parms.iph.daddr && | |
110 | (!dev || !t->parms.link || dev->ifindex == t->parms.link) && | |
111 | (t->dev->flags & IFF_UP)) | |
112 | return t; | |
113 | } | |
114 | for_each_ip_tunnel_rcu(t, sitn->tunnels_l[h1]) { | |
115 | if (local == t->parms.iph.saddr && | |
116 | (!dev || !t->parms.link || dev->ifindex == t->parms.link) && | |
117 | (t->dev->flags & IFF_UP)) | |
118 | return t; | |
119 | } | |
120 | t = rcu_dereference(sitn->tunnels_wc[0]); | |
121 | if (t && (t->dev->flags & IFF_UP)) | |
122 | return t; | |
123 | return NULL; | |
124 | } | |
125 | ||
126 | static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn, | |
127 | struct ip_tunnel_parm *parms) | |
128 | { | |
129 | __be32 remote = parms->iph.daddr; | |
130 | __be32 local = parms->iph.saddr; | |
131 | unsigned int h = 0; | |
132 | int prio = 0; | |
133 | ||
134 | if (remote) { | |
135 | prio |= 2; | |
136 | h ^= HASH(remote); | |
137 | } | |
138 | if (local) { | |
139 | prio |= 1; | |
140 | h ^= HASH(local); | |
141 | } | |
142 | return &sitn->tunnels[prio][h]; | |
143 | } | |
144 | ||
145 | static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn, | |
146 | struct ip_tunnel *t) | |
147 | { | |
148 | return __ipip6_bucket(sitn, &t->parms); | |
149 | } | |
150 | ||
151 | static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t) | |
152 | { | |
153 | struct ip_tunnel __rcu **tp; | |
154 | struct ip_tunnel *iter; | |
155 | ||
156 | for (tp = ipip6_bucket(sitn, t); | |
157 | (iter = rtnl_dereference(*tp)) != NULL; | |
158 | tp = &iter->next) { | |
159 | if (t == iter) { | |
160 | rcu_assign_pointer(*tp, t->next); | |
161 | break; | |
162 | } | |
163 | } | |
164 | } | |
165 | ||
166 | static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t) | |
167 | { | |
168 | struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t); | |
169 | ||
170 | rcu_assign_pointer(t->next, rtnl_dereference(*tp)); | |
171 | rcu_assign_pointer(*tp, t); | |
172 | } | |
173 | ||
174 | static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn) | |
175 | { | |
176 | #ifdef CONFIG_IPV6_SIT_6RD | |
177 | struct ip_tunnel *t = netdev_priv(dev); | |
178 | ||
179 | if (t->dev == sitn->fb_tunnel_dev) { | |
180 | ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0); | |
181 | t->ip6rd.relay_prefix = 0; | |
182 | t->ip6rd.prefixlen = 16; | |
183 | t->ip6rd.relay_prefixlen = 0; | |
184 | } else { | |
185 | struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev); | |
186 | memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd)); | |
187 | } | |
188 | #endif | |
189 | } | |
190 | ||
191 | static int ipip6_tunnel_create(struct net_device *dev) | |
192 | { | |
193 | struct ip_tunnel *t = netdev_priv(dev); | |
194 | struct net *net = dev_net(dev); | |
195 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
196 | int err; | |
197 | ||
198 | memcpy(dev->dev_addr, &t->parms.iph.saddr, 4); | |
199 | memcpy(dev->broadcast, &t->parms.iph.daddr, 4); | |
200 | ||
201 | if ((__force u16)t->parms.i_flags & SIT_ISATAP) | |
202 | dev->priv_flags |= IFF_ISATAP; | |
203 | ||
204 | dev->rtnl_link_ops = &sit_link_ops; | |
205 | ||
206 | err = register_netdevice(dev); | |
207 | if (err < 0) | |
208 | goto out; | |
209 | ||
210 | ipip6_tunnel_clone_6rd(dev, sitn); | |
211 | ||
212 | dev_hold(dev); | |
213 | ||
214 | ipip6_tunnel_link(sitn, t); | |
215 | return 0; | |
216 | ||
217 | out: | |
218 | return err; | |
219 | } | |
220 | ||
221 | static struct ip_tunnel *ipip6_tunnel_locate(struct net *net, | |
222 | struct ip_tunnel_parm *parms, int create) | |
223 | { | |
224 | __be32 remote = parms->iph.daddr; | |
225 | __be32 local = parms->iph.saddr; | |
226 | struct ip_tunnel *t, *nt; | |
227 | struct ip_tunnel __rcu **tp; | |
228 | struct net_device *dev; | |
229 | char name[IFNAMSIZ]; | |
230 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
231 | ||
232 | for (tp = __ipip6_bucket(sitn, parms); | |
233 | (t = rtnl_dereference(*tp)) != NULL; | |
234 | tp = &t->next) { | |
235 | if (local == t->parms.iph.saddr && | |
236 | remote == t->parms.iph.daddr && | |
237 | parms->link == t->parms.link) { | |
238 | if (create) | |
239 | return NULL; | |
240 | else | |
241 | return t; | |
242 | } | |
243 | } | |
244 | if (!create) | |
245 | goto failed; | |
246 | ||
247 | if (parms->name[0]) | |
248 | strlcpy(name, parms->name, IFNAMSIZ); | |
249 | else | |
250 | strcpy(name, "sit%d"); | |
251 | ||
252 | dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, | |
253 | ipip6_tunnel_setup); | |
254 | if (!dev) | |
255 | return NULL; | |
256 | ||
257 | dev_net_set(dev, net); | |
258 | ||
259 | nt = netdev_priv(dev); | |
260 | ||
261 | nt->parms = *parms; | |
262 | if (ipip6_tunnel_create(dev) < 0) | |
263 | goto failed_free; | |
264 | ||
265 | return nt; | |
266 | ||
267 | failed_free: | |
268 | ipip6_dev_free(dev); | |
269 | failed: | |
270 | return NULL; | |
271 | } | |
272 | ||
273 | #define for_each_prl_rcu(start) \ | |
274 | for (prl = rcu_dereference(start); \ | |
275 | prl; \ | |
276 | prl = rcu_dereference(prl->next)) | |
277 | ||
278 | static struct ip_tunnel_prl_entry * | |
279 | __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) | |
280 | { | |
281 | struct ip_tunnel_prl_entry *prl; | |
282 | ||
283 | for_each_prl_rcu(t->prl) | |
284 | if (prl->addr == addr) | |
285 | break; | |
286 | return prl; | |
287 | ||
288 | } | |
289 | ||
290 | static int ipip6_tunnel_get_prl(struct ip_tunnel *t, | |
291 | struct ip_tunnel_prl __user *a) | |
292 | { | |
293 | struct ip_tunnel_prl kprl, *kp; | |
294 | struct ip_tunnel_prl_entry *prl; | |
295 | unsigned int cmax, c = 0, ca, len; | |
296 | int ret = 0; | |
297 | ||
298 | if (copy_from_user(&kprl, a, sizeof(kprl))) | |
299 | return -EFAULT; | |
300 | cmax = kprl.datalen / sizeof(kprl); | |
301 | if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) | |
302 | cmax = 1; | |
303 | ||
304 | /* For simple GET or for root users, | |
305 | * we try harder to allocate. | |
306 | */ | |
307 | kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? | |
308 | kcalloc(cmax, sizeof(*kp), GFP_KERNEL) : | |
309 | NULL; | |
310 | ||
311 | rcu_read_lock(); | |
312 | ||
313 | ca = t->prl_count < cmax ? t->prl_count : cmax; | |
314 | ||
315 | if (!kp) { | |
316 | /* We don't try hard to allocate much memory for | |
317 | * non-root users. | |
318 | * For root users, retry allocating enough memory for | |
319 | * the answer. | |
320 | */ | |
321 | kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC); | |
322 | if (!kp) { | |
323 | ret = -ENOMEM; | |
324 | goto out; | |
325 | } | |
326 | } | |
327 | ||
328 | c = 0; | |
329 | for_each_prl_rcu(t->prl) { | |
330 | if (c >= cmax) | |
331 | break; | |
332 | if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) | |
333 | continue; | |
334 | kp[c].addr = prl->addr; | |
335 | kp[c].flags = prl->flags; | |
336 | c++; | |
337 | if (kprl.addr != htonl(INADDR_ANY)) | |
338 | break; | |
339 | } | |
340 | out: | |
341 | rcu_read_unlock(); | |
342 | ||
343 | len = sizeof(*kp) * c; | |
344 | ret = 0; | |
345 | if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) | |
346 | ret = -EFAULT; | |
347 | ||
348 | kfree(kp); | |
349 | ||
350 | return ret; | |
351 | } | |
352 | ||
353 | static int | |
354 | ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) | |
355 | { | |
356 | struct ip_tunnel_prl_entry *p; | |
357 | int err = 0; | |
358 | ||
359 | if (a->addr == htonl(INADDR_ANY)) | |
360 | return -EINVAL; | |
361 | ||
362 | ASSERT_RTNL(); | |
363 | ||
364 | for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) { | |
365 | if (p->addr == a->addr) { | |
366 | if (chg) { | |
367 | p->flags = a->flags; | |
368 | goto out; | |
369 | } | |
370 | err = -EEXIST; | |
371 | goto out; | |
372 | } | |
373 | } | |
374 | ||
375 | if (chg) { | |
376 | err = -ENXIO; | |
377 | goto out; | |
378 | } | |
379 | ||
380 | p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); | |
381 | if (!p) { | |
382 | err = -ENOBUFS; | |
383 | goto out; | |
384 | } | |
385 | ||
386 | p->next = t->prl; | |
387 | p->addr = a->addr; | |
388 | p->flags = a->flags; | |
389 | t->prl_count++; | |
390 | rcu_assign_pointer(t->prl, p); | |
391 | out: | |
392 | return err; | |
393 | } | |
394 | ||
395 | static void prl_list_destroy_rcu(struct rcu_head *head) | |
396 | { | |
397 | struct ip_tunnel_prl_entry *p, *n; | |
398 | ||
399 | p = container_of(head, struct ip_tunnel_prl_entry, rcu_head); | |
400 | do { | |
401 | n = rcu_dereference_protected(p->next, 1); | |
402 | kfree(p); | |
403 | p = n; | |
404 | } while (p); | |
405 | } | |
406 | ||
407 | static int | |
408 | ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) | |
409 | { | |
410 | struct ip_tunnel_prl_entry *x; | |
411 | struct ip_tunnel_prl_entry __rcu **p; | |
412 | int err = 0; | |
413 | ||
414 | ASSERT_RTNL(); | |
415 | ||
416 | if (a && a->addr != htonl(INADDR_ANY)) { | |
417 | for (p = &t->prl; | |
418 | (x = rtnl_dereference(*p)) != NULL; | |
419 | p = &x->next) { | |
420 | if (x->addr == a->addr) { | |
421 | *p = x->next; | |
422 | kfree_rcu(x, rcu_head); | |
423 | t->prl_count--; | |
424 | goto out; | |
425 | } | |
426 | } | |
427 | err = -ENXIO; | |
428 | } else { | |
429 | x = rtnl_dereference(t->prl); | |
430 | if (x) { | |
431 | t->prl_count = 0; | |
432 | call_rcu(&x->rcu_head, prl_list_destroy_rcu); | |
433 | t->prl = NULL; | |
434 | } | |
435 | } | |
436 | out: | |
437 | return err; | |
438 | } | |
439 | ||
440 | static int | |
441 | isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t) | |
442 | { | |
443 | struct ip_tunnel_prl_entry *p; | |
444 | int ok = 1; | |
445 | ||
446 | rcu_read_lock(); | |
447 | p = __ipip6_tunnel_locate_prl(t, iph->saddr); | |
448 | if (p) { | |
449 | if (p->flags & PRL_DEFAULT) | |
450 | skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; | |
451 | else | |
452 | skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; | |
453 | } else { | |
454 | const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; | |
455 | ||
456 | if (ipv6_addr_is_isatap(addr6) && | |
457 | (addr6->s6_addr32[3] == iph->saddr) && | |
458 | ipv6_chk_prefix(addr6, t->dev)) | |
459 | skb->ndisc_nodetype = NDISC_NODETYPE_HOST; | |
460 | else | |
461 | ok = 0; | |
462 | } | |
463 | rcu_read_unlock(); | |
464 | return ok; | |
465 | } | |
466 | ||
467 | static void ipip6_tunnel_uninit(struct net_device *dev) | |
468 | { | |
469 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
470 | struct sit_net *sitn = net_generic(tunnel->net, sit_net_id); | |
471 | ||
472 | if (dev == sitn->fb_tunnel_dev) { | |
473 | RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL); | |
474 | } else { | |
475 | ipip6_tunnel_unlink(sitn, tunnel); | |
476 | ipip6_tunnel_del_prl(tunnel, NULL); | |
477 | } | |
478 | dst_cache_reset(&tunnel->dst_cache); | |
479 | dev_put(dev); | |
480 | } | |
481 | ||
482 | /* Generate icmpv6 with type/code ICMPV6_DEST_UNREACH/ICMPV6_ADDR_UNREACH | |
483 | * if sufficient data bytes are available | |
484 | */ | |
485 | static int ipip6_err_gen_icmpv6_unreach(struct sk_buff *skb) | |
486 | { | |
487 | int ihl = ((const struct iphdr *)skb->data)->ihl*4; | |
488 | struct rt6_info *rt; | |
489 | struct sk_buff *skb2; | |
490 | ||
491 | if (!pskb_may_pull(skb, ihl + sizeof(struct ipv6hdr) + 8)) | |
492 | return 1; | |
493 | ||
494 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
495 | ||
496 | if (!skb2) | |
497 | return 1; | |
498 | ||
499 | skb_dst_drop(skb2); | |
500 | skb_pull(skb2, ihl); | |
501 | skb_reset_network_header(skb2); | |
502 | ||
503 | rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, NULL, 0, 0); | |
504 | ||
505 | if (rt && rt->dst.dev) | |
506 | skb2->dev = rt->dst.dev; | |
507 | ||
508 | icmpv6_send(skb2, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); | |
509 | ||
510 | if (rt) | |
511 | ip6_rt_put(rt); | |
512 | ||
513 | kfree_skb(skb2); | |
514 | ||
515 | return 0; | |
516 | } | |
517 | ||
518 | static int ipip6_err(struct sk_buff *skb, u32 info) | |
519 | { | |
520 | const struct iphdr *iph = (const struct iphdr *)skb->data; | |
521 | const int type = icmp_hdr(skb)->type; | |
522 | const int code = icmp_hdr(skb)->code; | |
523 | struct ip_tunnel *t; | |
524 | int err; | |
525 | ||
526 | switch (type) { | |
527 | default: | |
528 | case ICMP_PARAMETERPROB: | |
529 | return 0; | |
530 | ||
531 | case ICMP_DEST_UNREACH: | |
532 | switch (code) { | |
533 | case ICMP_SR_FAILED: | |
534 | /* Impossible event. */ | |
535 | return 0; | |
536 | default: | |
537 | /* All others are translated to HOST_UNREACH. | |
538 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
539 | I believe they are just ether pollution. --ANK | |
540 | */ | |
541 | break; | |
542 | } | |
543 | break; | |
544 | case ICMP_TIME_EXCEEDED: | |
545 | if (code != ICMP_EXC_TTL) | |
546 | return 0; | |
547 | break; | |
548 | case ICMP_REDIRECT: | |
549 | break; | |
550 | } | |
551 | ||
552 | err = -ENOENT; | |
553 | ||
554 | t = ipip6_tunnel_lookup(dev_net(skb->dev), | |
555 | skb->dev, | |
556 | iph->daddr, | |
557 | iph->saddr); | |
558 | if (!t) | |
559 | goto out; | |
560 | ||
561 | if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { | |
562 | ipv4_update_pmtu(skb, dev_net(skb->dev), info, | |
563 | t->parms.link, 0, IPPROTO_IPV6, 0); | |
564 | err = 0; | |
565 | goto out; | |
566 | } | |
567 | if (type == ICMP_REDIRECT) { | |
568 | ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 0, | |
569 | IPPROTO_IPV6, 0); | |
570 | err = 0; | |
571 | goto out; | |
572 | } | |
573 | ||
574 | if (t->parms.iph.daddr == 0) | |
575 | goto out; | |
576 | ||
577 | err = 0; | |
578 | if (!ipip6_err_gen_icmpv6_unreach(skb)) | |
579 | goto out; | |
580 | ||
581 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) | |
582 | goto out; | |
583 | ||
584 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) | |
585 | t->err_count++; | |
586 | else | |
587 | t->err_count = 1; | |
588 | t->err_time = jiffies; | |
589 | out: | |
590 | return err; | |
591 | } | |
592 | ||
593 | static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr, | |
594 | const struct in6_addr *v6addr) | |
595 | { | |
596 | __be32 v4embed = 0; | |
597 | if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed) | |
598 | return true; | |
599 | return false; | |
600 | } | |
601 | ||
602 | /* Checks if an address matches an address on the tunnel interface. | |
603 | * Used to detect the NAT of proto 41 packets and let them pass spoofing test. | |
604 | * Long story: | |
605 | * This function is called after we considered the packet as spoofed | |
606 | * in is_spoofed_6rd. | |
607 | * We may have a router that is doing NAT for proto 41 packets | |
608 | * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb | |
609 | * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd | |
610 | * function will return true, dropping the packet. | |
611 | * But, we can still check if is spoofed against the IP | |
612 | * addresses associated with the interface. | |
613 | */ | |
614 | static bool only_dnatted(const struct ip_tunnel *tunnel, | |
615 | const struct in6_addr *v6dst) | |
616 | { | |
617 | int prefix_len; | |
618 | ||
619 | #ifdef CONFIG_IPV6_SIT_6RD | |
620 | prefix_len = tunnel->ip6rd.prefixlen + 32 | |
621 | - tunnel->ip6rd.relay_prefixlen; | |
622 | #else | |
623 | prefix_len = 48; | |
624 | #endif | |
625 | return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev); | |
626 | } | |
627 | ||
628 | /* Returns true if a packet is spoofed */ | |
629 | static bool packet_is_spoofed(struct sk_buff *skb, | |
630 | const struct iphdr *iph, | |
631 | struct ip_tunnel *tunnel) | |
632 | { | |
633 | const struct ipv6hdr *ipv6h; | |
634 | ||
635 | if (tunnel->dev->priv_flags & IFF_ISATAP) { | |
636 | if (!isatap_chksrc(skb, iph, tunnel)) | |
637 | return true; | |
638 | ||
639 | return false; | |
640 | } | |
641 | ||
642 | if (tunnel->dev->flags & IFF_POINTOPOINT) | |
643 | return false; | |
644 | ||
645 | ipv6h = ipv6_hdr(skb); | |
646 | ||
647 | if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) { | |
648 | net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n", | |
649 | &iph->saddr, &ipv6h->saddr, | |
650 | &iph->daddr, &ipv6h->daddr); | |
651 | return true; | |
652 | } | |
653 | ||
654 | if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr))) | |
655 | return false; | |
656 | ||
657 | if (only_dnatted(tunnel, &ipv6h->daddr)) | |
658 | return false; | |
659 | ||
660 | net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n", | |
661 | &iph->saddr, &ipv6h->saddr, | |
662 | &iph->daddr, &ipv6h->daddr); | |
663 | return true; | |
664 | } | |
665 | ||
666 | static int ipip6_rcv(struct sk_buff *skb) | |
667 | { | |
668 | const struct iphdr *iph = ip_hdr(skb); | |
669 | struct ip_tunnel *tunnel; | |
670 | int err; | |
671 | ||
672 | tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, | |
673 | iph->saddr, iph->daddr); | |
674 | if (tunnel) { | |
675 | struct pcpu_sw_netstats *tstats; | |
676 | ||
677 | if (tunnel->parms.iph.protocol != IPPROTO_IPV6 && | |
678 | tunnel->parms.iph.protocol != 0) | |
679 | goto out; | |
680 | ||
681 | skb->mac_header = skb->network_header; | |
682 | skb_reset_network_header(skb); | |
683 | IPCB(skb)->flags = 0; | |
684 | skb->dev = tunnel->dev; | |
685 | ||
686 | if (packet_is_spoofed(skb, iph, tunnel)) { | |
687 | tunnel->dev->stats.rx_errors++; | |
688 | goto out; | |
689 | } | |
690 | ||
691 | if (iptunnel_pull_header(skb, 0, htons(ETH_P_IPV6), | |
692 | !net_eq(tunnel->net, dev_net(tunnel->dev)))) | |
693 | goto out; | |
694 | ||
695 | err = IP_ECN_decapsulate(iph, skb); | |
696 | if (unlikely(err)) { | |
697 | if (log_ecn_error) | |
698 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", | |
699 | &iph->saddr, iph->tos); | |
700 | if (err > 1) { | |
701 | ++tunnel->dev->stats.rx_frame_errors; | |
702 | ++tunnel->dev->stats.rx_errors; | |
703 | goto out; | |
704 | } | |
705 | } | |
706 | ||
707 | tstats = this_cpu_ptr(tunnel->dev->tstats); | |
708 | u64_stats_update_begin(&tstats->syncp); | |
709 | tstats->rx_packets++; | |
710 | tstats->rx_bytes += skb->len; | |
711 | u64_stats_update_end(&tstats->syncp); | |
712 | ||
713 | netif_rx(skb); | |
714 | ||
715 | return 0; | |
716 | } | |
717 | ||
718 | /* no tunnel matched, let upstream know, ipsec may handle it */ | |
719 | return 1; | |
720 | out: | |
721 | kfree_skb(skb); | |
722 | return 0; | |
723 | } | |
724 | ||
725 | static const struct tnl_ptk_info tpi = { | |
726 | /* no tunnel info required for ipip. */ | |
727 | .proto = htons(ETH_P_IP), | |
728 | }; | |
729 | ||
730 | static int ipip_rcv(struct sk_buff *skb) | |
731 | { | |
732 | const struct iphdr *iph; | |
733 | struct ip_tunnel *tunnel; | |
734 | ||
735 | iph = ip_hdr(skb); | |
736 | tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, | |
737 | iph->saddr, iph->daddr); | |
738 | if (tunnel) { | |
739 | if (tunnel->parms.iph.protocol != IPPROTO_IPIP && | |
740 | tunnel->parms.iph.protocol != 0) | |
741 | goto drop; | |
742 | ||
743 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
744 | goto drop; | |
745 | if (iptunnel_pull_header(skb, 0, tpi.proto, false)) | |
746 | goto drop; | |
747 | return ip_tunnel_rcv(tunnel, skb, &tpi, NULL, log_ecn_error); | |
748 | } | |
749 | ||
750 | return 1; | |
751 | ||
752 | drop: | |
753 | kfree_skb(skb); | |
754 | return 0; | |
755 | } | |
756 | ||
757 | /* | |
758 | * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function | |
759 | * stores the embedded IPv4 address in v4dst and returns true. | |
760 | */ | |
761 | static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, | |
762 | __be32 *v4dst) | |
763 | { | |
764 | #ifdef CONFIG_IPV6_SIT_6RD | |
765 | if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, | |
766 | tunnel->ip6rd.prefixlen)) { | |
767 | unsigned int pbw0, pbi0; | |
768 | int pbi1; | |
769 | u32 d; | |
770 | ||
771 | pbw0 = tunnel->ip6rd.prefixlen >> 5; | |
772 | pbi0 = tunnel->ip6rd.prefixlen & 0x1f; | |
773 | ||
774 | d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> | |
775 | tunnel->ip6rd.relay_prefixlen; | |
776 | ||
777 | pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; | |
778 | if (pbi1 > 0) | |
779 | d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> | |
780 | (32 - pbi1); | |
781 | ||
782 | *v4dst = tunnel->ip6rd.relay_prefix | htonl(d); | |
783 | return true; | |
784 | } | |
785 | #else | |
786 | if (v6dst->s6_addr16[0] == htons(0x2002)) { | |
787 | /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ | |
788 | memcpy(v4dst, &v6dst->s6_addr16[1], 4); | |
789 | return true; | |
790 | } | |
791 | #endif | |
792 | return false; | |
793 | } | |
794 | ||
795 | static inline __be32 try_6rd(struct ip_tunnel *tunnel, | |
796 | const struct in6_addr *v6dst) | |
797 | { | |
798 | __be32 dst = 0; | |
799 | check_6rd(tunnel, v6dst, &dst); | |
800 | return dst; | |
801 | } | |
802 | ||
803 | /* | |
804 | * This function assumes it is being called from dev_queue_xmit() | |
805 | * and that skb is filled properly by that function. | |
806 | */ | |
807 | ||
808 | static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, | |
809 | struct net_device *dev) | |
810 | { | |
811 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
812 | const struct iphdr *tiph = &tunnel->parms.iph; | |
813 | const struct ipv6hdr *iph6 = ipv6_hdr(skb); | |
814 | u8 tos = tunnel->parms.iph.tos; | |
815 | __be16 df = tiph->frag_off; | |
816 | struct rtable *rt; /* Route to the other host */ | |
817 | struct net_device *tdev; /* Device to other host */ | |
818 | unsigned int max_headroom; /* The extra header space needed */ | |
819 | __be32 dst = tiph->daddr; | |
820 | struct flowi4 fl4; | |
821 | int mtu; | |
822 | const struct in6_addr *addr6; | |
823 | int addr_type; | |
824 | u8 ttl; | |
825 | u8 protocol = IPPROTO_IPV6; | |
826 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
827 | ||
828 | if (skb->protocol != htons(ETH_P_IPV6)) | |
829 | goto tx_error; | |
830 | ||
831 | if (tos == 1) | |
832 | tos = ipv6_get_dsfield(iph6); | |
833 | ||
834 | /* ISATAP (RFC4214) - must come before 6to4 */ | |
835 | if (dev->priv_flags & IFF_ISATAP) { | |
836 | struct neighbour *neigh = NULL; | |
837 | bool do_tx_error = false; | |
838 | ||
839 | if (skb_dst(skb)) | |
840 | neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); | |
841 | ||
842 | if (!neigh) { | |
843 | net_dbg_ratelimited("nexthop == NULL\n"); | |
844 | goto tx_error; | |
845 | } | |
846 | ||
847 | addr6 = (const struct in6_addr *)&neigh->primary_key; | |
848 | addr_type = ipv6_addr_type(addr6); | |
849 | ||
850 | if ((addr_type & IPV6_ADDR_UNICAST) && | |
851 | ipv6_addr_is_isatap(addr6)) | |
852 | dst = addr6->s6_addr32[3]; | |
853 | else | |
854 | do_tx_error = true; | |
855 | ||
856 | neigh_release(neigh); | |
857 | if (do_tx_error) | |
858 | goto tx_error; | |
859 | } | |
860 | ||
861 | if (!dst) | |
862 | dst = try_6rd(tunnel, &iph6->daddr); | |
863 | ||
864 | if (!dst) { | |
865 | struct neighbour *neigh = NULL; | |
866 | bool do_tx_error = false; | |
867 | ||
868 | if (skb_dst(skb)) | |
869 | neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); | |
870 | ||
871 | if (!neigh) { | |
872 | net_dbg_ratelimited("nexthop == NULL\n"); | |
873 | goto tx_error; | |
874 | } | |
875 | ||
876 | addr6 = (const struct in6_addr *)&neigh->primary_key; | |
877 | addr_type = ipv6_addr_type(addr6); | |
878 | ||
879 | if (addr_type == IPV6_ADDR_ANY) { | |
880 | addr6 = &ipv6_hdr(skb)->daddr; | |
881 | addr_type = ipv6_addr_type(addr6); | |
882 | } | |
883 | ||
884 | if ((addr_type & IPV6_ADDR_COMPATv4) != 0) | |
885 | dst = addr6->s6_addr32[3]; | |
886 | else | |
887 | do_tx_error = true; | |
888 | ||
889 | neigh_release(neigh); | |
890 | if (do_tx_error) | |
891 | goto tx_error; | |
892 | } | |
893 | ||
894 | rt = ip_route_output_ports(tunnel->net, &fl4, NULL, | |
895 | dst, tiph->saddr, | |
896 | 0, 0, | |
897 | IPPROTO_IPV6, RT_TOS(tos), | |
898 | tunnel->parms.link); | |
899 | if (IS_ERR(rt)) { | |
900 | dev->stats.tx_carrier_errors++; | |
901 | goto tx_error_icmp; | |
902 | } | |
903 | if (rt->rt_type != RTN_UNICAST) { | |
904 | ip_rt_put(rt); | |
905 | dev->stats.tx_carrier_errors++; | |
906 | goto tx_error_icmp; | |
907 | } | |
908 | tdev = rt->dst.dev; | |
909 | ||
910 | if (tdev == dev) { | |
911 | ip_rt_put(rt); | |
912 | dev->stats.collisions++; | |
913 | goto tx_error; | |
914 | } | |
915 | ||
916 | if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) { | |
917 | ip_rt_put(rt); | |
918 | goto tx_error; | |
919 | } | |
920 | ||
921 | if (df) { | |
922 | mtu = dst_mtu(&rt->dst) - t_hlen; | |
923 | ||
924 | if (mtu < 68) { | |
925 | dev->stats.collisions++; | |
926 | ip_rt_put(rt); | |
927 | goto tx_error; | |
928 | } | |
929 | ||
930 | if (mtu < IPV6_MIN_MTU) { | |
931 | mtu = IPV6_MIN_MTU; | |
932 | df = 0; | |
933 | } | |
934 | ||
935 | if (tunnel->parms.iph.daddr && skb_dst(skb)) | |
936 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); | |
937 | ||
938 | if (skb->len > mtu && !skb_is_gso(skb)) { | |
939 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); | |
940 | ip_rt_put(rt); | |
941 | goto tx_error; | |
942 | } | |
943 | } | |
944 | ||
945 | if (tunnel->err_count > 0) { | |
946 | if (time_before(jiffies, | |
947 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
948 | tunnel->err_count--; | |
949 | dst_link_failure(skb); | |
950 | } else | |
951 | tunnel->err_count = 0; | |
952 | } | |
953 | ||
954 | /* | |
955 | * Okay, now see if we can stuff it in the buffer as-is. | |
956 | */ | |
957 | max_headroom = LL_RESERVED_SPACE(tdev) + t_hlen; | |
958 | ||
959 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || | |
960 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
961 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); | |
962 | if (!new_skb) { | |
963 | ip_rt_put(rt); | |
964 | dev->stats.tx_dropped++; | |
965 | kfree_skb(skb); | |
966 | return NETDEV_TX_OK; | |
967 | } | |
968 | if (skb->sk) | |
969 | skb_set_owner_w(new_skb, skb->sk); | |
970 | dev_kfree_skb(skb); | |
971 | skb = new_skb; | |
972 | iph6 = ipv6_hdr(skb); | |
973 | } | |
974 | ttl = tiph->ttl; | |
975 | if (ttl == 0) | |
976 | ttl = iph6->hop_limit; | |
977 | tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); | |
978 | ||
979 | if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) { | |
980 | ip_rt_put(rt); | |
981 | goto tx_error; | |
982 | } | |
983 | ||
984 | skb_set_inner_ipproto(skb, IPPROTO_IPV6); | |
985 | ||
986 | iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl, | |
987 | df, !net_eq(tunnel->net, dev_net(dev))); | |
988 | return NETDEV_TX_OK; | |
989 | ||
990 | tx_error_icmp: | |
991 | dst_link_failure(skb); | |
992 | tx_error: | |
993 | kfree_skb(skb); | |
994 | dev->stats.tx_errors++; | |
995 | return NETDEV_TX_OK; | |
996 | } | |
997 | ||
998 | static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) | |
999 | { | |
1000 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1001 | const struct iphdr *tiph = &tunnel->parms.iph; | |
1002 | ||
1003 | if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) | |
1004 | goto tx_error; | |
1005 | ||
1006 | skb_set_inner_ipproto(skb, IPPROTO_IPIP); | |
1007 | ||
1008 | ip_tunnel_xmit(skb, dev, tiph, IPPROTO_IPIP); | |
1009 | return NETDEV_TX_OK; | |
1010 | tx_error: | |
1011 | kfree_skb(skb); | |
1012 | dev->stats.tx_errors++; | |
1013 | return NETDEV_TX_OK; | |
1014 | } | |
1015 | ||
1016 | static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb, | |
1017 | struct net_device *dev) | |
1018 | { | |
1019 | switch (skb->protocol) { | |
1020 | case htons(ETH_P_IP): | |
1021 | ipip_tunnel_xmit(skb, dev); | |
1022 | break; | |
1023 | case htons(ETH_P_IPV6): | |
1024 | ipip6_tunnel_xmit(skb, dev); | |
1025 | break; | |
1026 | default: | |
1027 | goto tx_err; | |
1028 | } | |
1029 | ||
1030 | return NETDEV_TX_OK; | |
1031 | ||
1032 | tx_err: | |
1033 | dev->stats.tx_errors++; | |
1034 | kfree_skb(skb); | |
1035 | return NETDEV_TX_OK; | |
1036 | ||
1037 | } | |
1038 | ||
1039 | static void ipip6_tunnel_bind_dev(struct net_device *dev) | |
1040 | { | |
1041 | struct net_device *tdev = NULL; | |
1042 | struct ip_tunnel *tunnel; | |
1043 | const struct iphdr *iph; | |
1044 | struct flowi4 fl4; | |
1045 | ||
1046 | tunnel = netdev_priv(dev); | |
1047 | iph = &tunnel->parms.iph; | |
1048 | ||
1049 | if (iph->daddr) { | |
1050 | struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4, | |
1051 | NULL, | |
1052 | iph->daddr, iph->saddr, | |
1053 | 0, 0, | |
1054 | IPPROTO_IPV6, | |
1055 | RT_TOS(iph->tos), | |
1056 | tunnel->parms.link); | |
1057 | ||
1058 | if (!IS_ERR(rt)) { | |
1059 | tdev = rt->dst.dev; | |
1060 | ip_rt_put(rt); | |
1061 | } | |
1062 | dev->flags |= IFF_POINTOPOINT; | |
1063 | } | |
1064 | ||
1065 | if (!tdev && tunnel->parms.link) | |
1066 | tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link); | |
1067 | ||
1068 | if (tdev) { | |
1069 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
1070 | ||
1071 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); | |
1072 | dev->mtu = tdev->mtu - t_hlen; | |
1073 | if (dev->mtu < IPV6_MIN_MTU) | |
1074 | dev->mtu = IPV6_MIN_MTU; | |
1075 | } | |
1076 | } | |
1077 | ||
1078 | static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p) | |
1079 | { | |
1080 | struct net *net = t->net; | |
1081 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1082 | ||
1083 | ipip6_tunnel_unlink(sitn, t); | |
1084 | synchronize_net(); | |
1085 | t->parms.iph.saddr = p->iph.saddr; | |
1086 | t->parms.iph.daddr = p->iph.daddr; | |
1087 | memcpy(t->dev->dev_addr, &p->iph.saddr, 4); | |
1088 | memcpy(t->dev->broadcast, &p->iph.daddr, 4); | |
1089 | ipip6_tunnel_link(sitn, t); | |
1090 | t->parms.iph.ttl = p->iph.ttl; | |
1091 | t->parms.iph.tos = p->iph.tos; | |
1092 | if (t->parms.link != p->link) { | |
1093 | t->parms.link = p->link; | |
1094 | ipip6_tunnel_bind_dev(t->dev); | |
1095 | } | |
1096 | dst_cache_reset(&t->dst_cache); | |
1097 | netdev_state_change(t->dev); | |
1098 | } | |
1099 | ||
1100 | #ifdef CONFIG_IPV6_SIT_6RD | |
1101 | static int ipip6_tunnel_update_6rd(struct ip_tunnel *t, | |
1102 | struct ip_tunnel_6rd *ip6rd) | |
1103 | { | |
1104 | struct in6_addr prefix; | |
1105 | __be32 relay_prefix; | |
1106 | ||
1107 | if (ip6rd->relay_prefixlen > 32 || | |
1108 | ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64) | |
1109 | return -EINVAL; | |
1110 | ||
1111 | ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen); | |
1112 | if (!ipv6_addr_equal(&prefix, &ip6rd->prefix)) | |
1113 | return -EINVAL; | |
1114 | if (ip6rd->relay_prefixlen) | |
1115 | relay_prefix = ip6rd->relay_prefix & | |
1116 | htonl(0xffffffffUL << | |
1117 | (32 - ip6rd->relay_prefixlen)); | |
1118 | else | |
1119 | relay_prefix = 0; | |
1120 | if (relay_prefix != ip6rd->relay_prefix) | |
1121 | return -EINVAL; | |
1122 | ||
1123 | t->ip6rd.prefix = prefix; | |
1124 | t->ip6rd.relay_prefix = relay_prefix; | |
1125 | t->ip6rd.prefixlen = ip6rd->prefixlen; | |
1126 | t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen; | |
1127 | dst_cache_reset(&t->dst_cache); | |
1128 | netdev_state_change(t->dev); | |
1129 | return 0; | |
1130 | } | |
1131 | #endif | |
1132 | ||
1133 | static int | |
1134 | ipip6_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) | |
1135 | { | |
1136 | int err = 0; | |
1137 | struct ip_tunnel_parm p; | |
1138 | struct ip_tunnel_prl prl; | |
1139 | struct ip_tunnel *t = netdev_priv(dev); | |
1140 | struct net *net = t->net; | |
1141 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1142 | #ifdef CONFIG_IPV6_SIT_6RD | |
1143 | struct ip_tunnel_6rd ip6rd; | |
1144 | #endif | |
1145 | ||
1146 | switch (cmd) { | |
1147 | case SIOCGETTUNNEL: | |
1148 | #ifdef CONFIG_IPV6_SIT_6RD | |
1149 | case SIOCGET6RD: | |
1150 | #endif | |
1151 | if (dev == sitn->fb_tunnel_dev) { | |
1152 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { | |
1153 | err = -EFAULT; | |
1154 | break; | |
1155 | } | |
1156 | t = ipip6_tunnel_locate(net, &p, 0); | |
1157 | if (!t) | |
1158 | t = netdev_priv(dev); | |
1159 | } | |
1160 | ||
1161 | err = -EFAULT; | |
1162 | if (cmd == SIOCGETTUNNEL) { | |
1163 | memcpy(&p, &t->parms, sizeof(p)); | |
1164 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, | |
1165 | sizeof(p))) | |
1166 | goto done; | |
1167 | #ifdef CONFIG_IPV6_SIT_6RD | |
1168 | } else { | |
1169 | ip6rd.prefix = t->ip6rd.prefix; | |
1170 | ip6rd.relay_prefix = t->ip6rd.relay_prefix; | |
1171 | ip6rd.prefixlen = t->ip6rd.prefixlen; | |
1172 | ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; | |
1173 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd, | |
1174 | sizeof(ip6rd))) | |
1175 | goto done; | |
1176 | #endif | |
1177 | } | |
1178 | err = 0; | |
1179 | break; | |
1180 | ||
1181 | case SIOCADDTUNNEL: | |
1182 | case SIOCCHGTUNNEL: | |
1183 | err = -EPERM; | |
1184 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
1185 | goto done; | |
1186 | ||
1187 | err = -EFAULT; | |
1188 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1189 | goto done; | |
1190 | ||
1191 | err = -EINVAL; | |
1192 | if (p.iph.protocol != IPPROTO_IPV6 && | |
1193 | p.iph.protocol != IPPROTO_IPIP && | |
1194 | p.iph.protocol != 0) | |
1195 | goto done; | |
1196 | if (p.iph.version != 4 || | |
1197 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) | |
1198 | goto done; | |
1199 | if (p.iph.ttl) | |
1200 | p.iph.frag_off |= htons(IP_DF); | |
1201 | ||
1202 | t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); | |
1203 | ||
1204 | if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { | |
1205 | if (t) { | |
1206 | if (t->dev != dev) { | |
1207 | err = -EEXIST; | |
1208 | break; | |
1209 | } | |
1210 | } else { | |
1211 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || | |
1212 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { | |
1213 | err = -EINVAL; | |
1214 | break; | |
1215 | } | |
1216 | t = netdev_priv(dev); | |
1217 | } | |
1218 | ||
1219 | ipip6_tunnel_update(t, &p); | |
1220 | } | |
1221 | ||
1222 | if (t) { | |
1223 | err = 0; | |
1224 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) | |
1225 | err = -EFAULT; | |
1226 | } else | |
1227 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1228 | break; | |
1229 | ||
1230 | case SIOCDELTUNNEL: | |
1231 | err = -EPERM; | |
1232 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
1233 | goto done; | |
1234 | ||
1235 | if (dev == sitn->fb_tunnel_dev) { | |
1236 | err = -EFAULT; | |
1237 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1238 | goto done; | |
1239 | err = -ENOENT; | |
1240 | t = ipip6_tunnel_locate(net, &p, 0); | |
1241 | if (!t) | |
1242 | goto done; | |
1243 | err = -EPERM; | |
1244 | if (t == netdev_priv(sitn->fb_tunnel_dev)) | |
1245 | goto done; | |
1246 | dev = t->dev; | |
1247 | } | |
1248 | unregister_netdevice(dev); | |
1249 | err = 0; | |
1250 | break; | |
1251 | ||
1252 | case SIOCGETPRL: | |
1253 | err = -EINVAL; | |
1254 | if (dev == sitn->fb_tunnel_dev) | |
1255 | goto done; | |
1256 | err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data); | |
1257 | break; | |
1258 | ||
1259 | case SIOCADDPRL: | |
1260 | case SIOCDELPRL: | |
1261 | case SIOCCHGPRL: | |
1262 | err = -EPERM; | |
1263 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
1264 | goto done; | |
1265 | err = -EINVAL; | |
1266 | if (dev == sitn->fb_tunnel_dev) | |
1267 | goto done; | |
1268 | err = -EFAULT; | |
1269 | if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) | |
1270 | goto done; | |
1271 | ||
1272 | switch (cmd) { | |
1273 | case SIOCDELPRL: | |
1274 | err = ipip6_tunnel_del_prl(t, &prl); | |
1275 | break; | |
1276 | case SIOCADDPRL: | |
1277 | case SIOCCHGPRL: | |
1278 | err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); | |
1279 | break; | |
1280 | } | |
1281 | dst_cache_reset(&t->dst_cache); | |
1282 | netdev_state_change(dev); | |
1283 | break; | |
1284 | ||
1285 | #ifdef CONFIG_IPV6_SIT_6RD | |
1286 | case SIOCADD6RD: | |
1287 | case SIOCCHG6RD: | |
1288 | case SIOCDEL6RD: | |
1289 | err = -EPERM; | |
1290 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
1291 | goto done; | |
1292 | ||
1293 | err = -EFAULT; | |
1294 | if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data, | |
1295 | sizeof(ip6rd))) | |
1296 | goto done; | |
1297 | ||
1298 | if (cmd != SIOCDEL6RD) { | |
1299 | err = ipip6_tunnel_update_6rd(t, &ip6rd); | |
1300 | if (err < 0) | |
1301 | goto done; | |
1302 | } else | |
1303 | ipip6_tunnel_clone_6rd(dev, sitn); | |
1304 | ||
1305 | err = 0; | |
1306 | break; | |
1307 | #endif | |
1308 | ||
1309 | default: | |
1310 | err = -EINVAL; | |
1311 | } | |
1312 | ||
1313 | done: | |
1314 | return err; | |
1315 | } | |
1316 | ||
1317 | static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu) | |
1318 | { | |
1319 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1320 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
1321 | ||
1322 | if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - t_hlen) | |
1323 | return -EINVAL; | |
1324 | dev->mtu = new_mtu; | |
1325 | return 0; | |
1326 | } | |
1327 | ||
1328 | static const struct net_device_ops ipip6_netdev_ops = { | |
1329 | .ndo_init = ipip6_tunnel_init, | |
1330 | .ndo_uninit = ipip6_tunnel_uninit, | |
1331 | .ndo_start_xmit = sit_tunnel_xmit, | |
1332 | .ndo_do_ioctl = ipip6_tunnel_ioctl, | |
1333 | .ndo_change_mtu = ipip6_tunnel_change_mtu, | |
1334 | .ndo_get_stats64 = ip_tunnel_get_stats64, | |
1335 | .ndo_get_iflink = ip_tunnel_get_iflink, | |
1336 | }; | |
1337 | ||
1338 | static void ipip6_dev_free(struct net_device *dev) | |
1339 | { | |
1340 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1341 | ||
1342 | dst_cache_destroy(&tunnel->dst_cache); | |
1343 | free_percpu(dev->tstats); | |
1344 | free_netdev(dev); | |
1345 | } | |
1346 | ||
1347 | #define SIT_FEATURES (NETIF_F_SG | \ | |
1348 | NETIF_F_FRAGLIST | \ | |
1349 | NETIF_F_HIGHDMA | \ | |
1350 | NETIF_F_GSO_SOFTWARE | \ | |
1351 | NETIF_F_HW_CSUM) | |
1352 | ||
1353 | static void ipip6_tunnel_setup(struct net_device *dev) | |
1354 | { | |
1355 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1356 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
1357 | ||
1358 | dev->netdev_ops = &ipip6_netdev_ops; | |
1359 | dev->destructor = ipip6_dev_free; | |
1360 | ||
1361 | dev->type = ARPHRD_SIT; | |
1362 | dev->hard_header_len = LL_MAX_HEADER + t_hlen; | |
1363 | dev->mtu = ETH_DATA_LEN - t_hlen; | |
1364 | dev->flags = IFF_NOARP; | |
1365 | netif_keep_dst(dev); | |
1366 | dev->addr_len = 4; | |
1367 | dev->features |= NETIF_F_LLTX; | |
1368 | dev->features |= SIT_FEATURES; | |
1369 | dev->hw_features |= SIT_FEATURES; | |
1370 | } | |
1371 | ||
1372 | static int ipip6_tunnel_init(struct net_device *dev) | |
1373 | { | |
1374 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1375 | int err; | |
1376 | ||
1377 | tunnel->dev = dev; | |
1378 | tunnel->net = dev_net(dev); | |
1379 | strcpy(tunnel->parms.name, dev->name); | |
1380 | ||
1381 | ipip6_tunnel_bind_dev(dev); | |
1382 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); | |
1383 | if (!dev->tstats) | |
1384 | return -ENOMEM; | |
1385 | ||
1386 | err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); | |
1387 | if (err) { | |
1388 | free_percpu(dev->tstats); | |
1389 | return err; | |
1390 | } | |
1391 | ||
1392 | return 0; | |
1393 | } | |
1394 | ||
1395 | static void __net_init ipip6_fb_tunnel_init(struct net_device *dev) | |
1396 | { | |
1397 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1398 | struct iphdr *iph = &tunnel->parms.iph; | |
1399 | struct net *net = dev_net(dev); | |
1400 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1401 | ||
1402 | iph->version = 4; | |
1403 | iph->protocol = IPPROTO_IPV6; | |
1404 | iph->ihl = 5; | |
1405 | iph->ttl = 64; | |
1406 | ||
1407 | dev_hold(dev); | |
1408 | rcu_assign_pointer(sitn->tunnels_wc[0], tunnel); | |
1409 | } | |
1410 | ||
1411 | static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[]) | |
1412 | { | |
1413 | u8 proto; | |
1414 | ||
1415 | if (!data || !data[IFLA_IPTUN_PROTO]) | |
1416 | return 0; | |
1417 | ||
1418 | proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1419 | if (proto != IPPROTO_IPV6 && | |
1420 | proto != IPPROTO_IPIP && | |
1421 | proto != 0) | |
1422 | return -EINVAL; | |
1423 | ||
1424 | return 0; | |
1425 | } | |
1426 | ||
1427 | static void ipip6_netlink_parms(struct nlattr *data[], | |
1428 | struct ip_tunnel_parm *parms) | |
1429 | { | |
1430 | memset(parms, 0, sizeof(*parms)); | |
1431 | ||
1432 | parms->iph.version = 4; | |
1433 | parms->iph.protocol = IPPROTO_IPV6; | |
1434 | parms->iph.ihl = 5; | |
1435 | parms->iph.ttl = 64; | |
1436 | ||
1437 | if (!data) | |
1438 | return; | |
1439 | ||
1440 | if (data[IFLA_IPTUN_LINK]) | |
1441 | parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); | |
1442 | ||
1443 | if (data[IFLA_IPTUN_LOCAL]) | |
1444 | parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]); | |
1445 | ||
1446 | if (data[IFLA_IPTUN_REMOTE]) | |
1447 | parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]); | |
1448 | ||
1449 | if (data[IFLA_IPTUN_TTL]) { | |
1450 | parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]); | |
1451 | if (parms->iph.ttl) | |
1452 | parms->iph.frag_off = htons(IP_DF); | |
1453 | } | |
1454 | ||
1455 | if (data[IFLA_IPTUN_TOS]) | |
1456 | parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]); | |
1457 | ||
1458 | if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC])) | |
1459 | parms->iph.frag_off = htons(IP_DF); | |
1460 | ||
1461 | if (data[IFLA_IPTUN_FLAGS]) | |
1462 | parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]); | |
1463 | ||
1464 | if (data[IFLA_IPTUN_PROTO]) | |
1465 | parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]); | |
1466 | ||
1467 | } | |
1468 | ||
1469 | /* This function returns true when ENCAP attributes are present in the nl msg */ | |
1470 | static bool ipip6_netlink_encap_parms(struct nlattr *data[], | |
1471 | struct ip_tunnel_encap *ipencap) | |
1472 | { | |
1473 | bool ret = false; | |
1474 | ||
1475 | memset(ipencap, 0, sizeof(*ipencap)); | |
1476 | ||
1477 | if (!data) | |
1478 | return ret; | |
1479 | ||
1480 | if (data[IFLA_IPTUN_ENCAP_TYPE]) { | |
1481 | ret = true; | |
1482 | ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); | |
1483 | } | |
1484 | ||
1485 | if (data[IFLA_IPTUN_ENCAP_FLAGS]) { | |
1486 | ret = true; | |
1487 | ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); | |
1488 | } | |
1489 | ||
1490 | if (data[IFLA_IPTUN_ENCAP_SPORT]) { | |
1491 | ret = true; | |
1492 | ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); | |
1493 | } | |
1494 | ||
1495 | if (data[IFLA_IPTUN_ENCAP_DPORT]) { | |
1496 | ret = true; | |
1497 | ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); | |
1498 | } | |
1499 | ||
1500 | return ret; | |
1501 | } | |
1502 | ||
1503 | #ifdef CONFIG_IPV6_SIT_6RD | |
1504 | /* This function returns true when 6RD attributes are present in the nl msg */ | |
1505 | static bool ipip6_netlink_6rd_parms(struct nlattr *data[], | |
1506 | struct ip_tunnel_6rd *ip6rd) | |
1507 | { | |
1508 | bool ret = false; | |
1509 | memset(ip6rd, 0, sizeof(*ip6rd)); | |
1510 | ||
1511 | if (!data) | |
1512 | return ret; | |
1513 | ||
1514 | if (data[IFLA_IPTUN_6RD_PREFIX]) { | |
1515 | ret = true; | |
1516 | ip6rd->prefix = nla_get_in6_addr(data[IFLA_IPTUN_6RD_PREFIX]); | |
1517 | } | |
1518 | ||
1519 | if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) { | |
1520 | ret = true; | |
1521 | ip6rd->relay_prefix = | |
1522 | nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]); | |
1523 | } | |
1524 | ||
1525 | if (data[IFLA_IPTUN_6RD_PREFIXLEN]) { | |
1526 | ret = true; | |
1527 | ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]); | |
1528 | } | |
1529 | ||
1530 | if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) { | |
1531 | ret = true; | |
1532 | ip6rd->relay_prefixlen = | |
1533 | nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]); | |
1534 | } | |
1535 | ||
1536 | return ret; | |
1537 | } | |
1538 | #endif | |
1539 | ||
1540 | static int ipip6_newlink(struct net *src_net, struct net_device *dev, | |
1541 | struct nlattr *tb[], struct nlattr *data[]) | |
1542 | { | |
1543 | struct net *net = dev_net(dev); | |
1544 | struct ip_tunnel *nt; | |
1545 | struct ip_tunnel_encap ipencap; | |
1546 | #ifdef CONFIG_IPV6_SIT_6RD | |
1547 | struct ip_tunnel_6rd ip6rd; | |
1548 | #endif | |
1549 | int err; | |
1550 | ||
1551 | nt = netdev_priv(dev); | |
1552 | ||
1553 | if (ipip6_netlink_encap_parms(data, &ipencap)) { | |
1554 | err = ip_tunnel_encap_setup(nt, &ipencap); | |
1555 | if (err < 0) | |
1556 | return err; | |
1557 | } | |
1558 | ||
1559 | ipip6_netlink_parms(data, &nt->parms); | |
1560 | ||
1561 | if (ipip6_tunnel_locate(net, &nt->parms, 0)) | |
1562 | return -EEXIST; | |
1563 | ||
1564 | err = ipip6_tunnel_create(dev); | |
1565 | if (err < 0) | |
1566 | return err; | |
1567 | ||
1568 | #ifdef CONFIG_IPV6_SIT_6RD | |
1569 | if (ipip6_netlink_6rd_parms(data, &ip6rd)) | |
1570 | err = ipip6_tunnel_update_6rd(nt, &ip6rd); | |
1571 | #endif | |
1572 | ||
1573 | return err; | |
1574 | } | |
1575 | ||
1576 | static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[], | |
1577 | struct nlattr *data[]) | |
1578 | { | |
1579 | struct ip_tunnel *t = netdev_priv(dev); | |
1580 | struct ip_tunnel_parm p; | |
1581 | struct ip_tunnel_encap ipencap; | |
1582 | struct net *net = t->net; | |
1583 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1584 | #ifdef CONFIG_IPV6_SIT_6RD | |
1585 | struct ip_tunnel_6rd ip6rd; | |
1586 | #endif | |
1587 | int err; | |
1588 | ||
1589 | if (dev == sitn->fb_tunnel_dev) | |
1590 | return -EINVAL; | |
1591 | ||
1592 | if (ipip6_netlink_encap_parms(data, &ipencap)) { | |
1593 | err = ip_tunnel_encap_setup(t, &ipencap); | |
1594 | if (err < 0) | |
1595 | return err; | |
1596 | } | |
1597 | ||
1598 | ipip6_netlink_parms(data, &p); | |
1599 | ||
1600 | if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || | |
1601 | (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) | |
1602 | return -EINVAL; | |
1603 | ||
1604 | t = ipip6_tunnel_locate(net, &p, 0); | |
1605 | ||
1606 | if (t) { | |
1607 | if (t->dev != dev) | |
1608 | return -EEXIST; | |
1609 | } else | |
1610 | t = netdev_priv(dev); | |
1611 | ||
1612 | ipip6_tunnel_update(t, &p); | |
1613 | ||
1614 | #ifdef CONFIG_IPV6_SIT_6RD | |
1615 | if (ipip6_netlink_6rd_parms(data, &ip6rd)) | |
1616 | return ipip6_tunnel_update_6rd(t, &ip6rd); | |
1617 | #endif | |
1618 | ||
1619 | return 0; | |
1620 | } | |
1621 | ||
1622 | static size_t ipip6_get_size(const struct net_device *dev) | |
1623 | { | |
1624 | return | |
1625 | /* IFLA_IPTUN_LINK */ | |
1626 | nla_total_size(4) + | |
1627 | /* IFLA_IPTUN_LOCAL */ | |
1628 | nla_total_size(4) + | |
1629 | /* IFLA_IPTUN_REMOTE */ | |
1630 | nla_total_size(4) + | |
1631 | /* IFLA_IPTUN_TTL */ | |
1632 | nla_total_size(1) + | |
1633 | /* IFLA_IPTUN_TOS */ | |
1634 | nla_total_size(1) + | |
1635 | /* IFLA_IPTUN_PMTUDISC */ | |
1636 | nla_total_size(1) + | |
1637 | /* IFLA_IPTUN_FLAGS */ | |
1638 | nla_total_size(2) + | |
1639 | /* IFLA_IPTUN_PROTO */ | |
1640 | nla_total_size(1) + | |
1641 | #ifdef CONFIG_IPV6_SIT_6RD | |
1642 | /* IFLA_IPTUN_6RD_PREFIX */ | |
1643 | nla_total_size(sizeof(struct in6_addr)) + | |
1644 | /* IFLA_IPTUN_6RD_RELAY_PREFIX */ | |
1645 | nla_total_size(4) + | |
1646 | /* IFLA_IPTUN_6RD_PREFIXLEN */ | |
1647 | nla_total_size(2) + | |
1648 | /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */ | |
1649 | nla_total_size(2) + | |
1650 | #endif | |
1651 | /* IFLA_IPTUN_ENCAP_TYPE */ | |
1652 | nla_total_size(2) + | |
1653 | /* IFLA_IPTUN_ENCAP_FLAGS */ | |
1654 | nla_total_size(2) + | |
1655 | /* IFLA_IPTUN_ENCAP_SPORT */ | |
1656 | nla_total_size(2) + | |
1657 | /* IFLA_IPTUN_ENCAP_DPORT */ | |
1658 | nla_total_size(2) + | |
1659 | 0; | |
1660 | } | |
1661 | ||
1662 | static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
1663 | { | |
1664 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1665 | struct ip_tunnel_parm *parm = &tunnel->parms; | |
1666 | ||
1667 | if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || | |
1668 | nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || | |
1669 | nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || | |
1670 | nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || | |
1671 | nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || | |
1672 | nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, | |
1673 | !!(parm->iph.frag_off & htons(IP_DF))) || | |
1674 | nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) || | |
1675 | nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags)) | |
1676 | goto nla_put_failure; | |
1677 | ||
1678 | #ifdef CONFIG_IPV6_SIT_6RD | |
1679 | if (nla_put_in6_addr(skb, IFLA_IPTUN_6RD_PREFIX, | |
1680 | &tunnel->ip6rd.prefix) || | |
1681 | nla_put_in_addr(skb, IFLA_IPTUN_6RD_RELAY_PREFIX, | |
1682 | tunnel->ip6rd.relay_prefix) || | |
1683 | nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN, | |
1684 | tunnel->ip6rd.prefixlen) || | |
1685 | nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN, | |
1686 | tunnel->ip6rd.relay_prefixlen)) | |
1687 | goto nla_put_failure; | |
1688 | #endif | |
1689 | ||
1690 | if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, | |
1691 | tunnel->encap.type) || | |
1692 | nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, | |
1693 | tunnel->encap.sport) || | |
1694 | nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, | |
1695 | tunnel->encap.dport) || | |
1696 | nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, | |
1697 | tunnel->encap.flags)) | |
1698 | goto nla_put_failure; | |
1699 | ||
1700 | return 0; | |
1701 | ||
1702 | nla_put_failure: | |
1703 | return -EMSGSIZE; | |
1704 | } | |
1705 | ||
1706 | static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = { | |
1707 | [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, | |
1708 | [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, | |
1709 | [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, | |
1710 | [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, | |
1711 | [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, | |
1712 | [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, | |
1713 | [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 }, | |
1714 | [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, | |
1715 | #ifdef CONFIG_IPV6_SIT_6RD | |
1716 | [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) }, | |
1717 | [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 }, | |
1718 | [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 }, | |
1719 | [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 }, | |
1720 | #endif | |
1721 | [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, | |
1722 | [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, | |
1723 | [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, | |
1724 | [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, | |
1725 | }; | |
1726 | ||
1727 | static void ipip6_dellink(struct net_device *dev, struct list_head *head) | |
1728 | { | |
1729 | struct net *net = dev_net(dev); | |
1730 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1731 | ||
1732 | if (dev != sitn->fb_tunnel_dev) | |
1733 | unregister_netdevice_queue(dev, head); | |
1734 | } | |
1735 | ||
1736 | static struct rtnl_link_ops sit_link_ops __read_mostly = { | |
1737 | .kind = "sit", | |
1738 | .maxtype = IFLA_IPTUN_MAX, | |
1739 | .policy = ipip6_policy, | |
1740 | .priv_size = sizeof(struct ip_tunnel), | |
1741 | .setup = ipip6_tunnel_setup, | |
1742 | .validate = ipip6_validate, | |
1743 | .newlink = ipip6_newlink, | |
1744 | .changelink = ipip6_changelink, | |
1745 | .get_size = ipip6_get_size, | |
1746 | .fill_info = ipip6_fill_info, | |
1747 | .dellink = ipip6_dellink, | |
1748 | .get_link_net = ip_tunnel_get_link_net, | |
1749 | }; | |
1750 | ||
1751 | static struct xfrm_tunnel sit_handler __read_mostly = { | |
1752 | .handler = ipip6_rcv, | |
1753 | .err_handler = ipip6_err, | |
1754 | .priority = 1, | |
1755 | }; | |
1756 | ||
1757 | static struct xfrm_tunnel ipip_handler __read_mostly = { | |
1758 | .handler = ipip_rcv, | |
1759 | .err_handler = ipip6_err, | |
1760 | .priority = 2, | |
1761 | }; | |
1762 | ||
1763 | static void __net_exit sit_destroy_tunnels(struct net *net, | |
1764 | struct list_head *head) | |
1765 | { | |
1766 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1767 | struct net_device *dev, *aux; | |
1768 | int prio; | |
1769 | ||
1770 | for_each_netdev_safe(net, dev, aux) | |
1771 | if (dev->rtnl_link_ops == &sit_link_ops) | |
1772 | unregister_netdevice_queue(dev, head); | |
1773 | ||
1774 | for (prio = 1; prio < 4; prio++) { | |
1775 | int h; | |
1776 | for (h = 0; h < HASH_SIZE; h++) { | |
1777 | struct ip_tunnel *t; | |
1778 | ||
1779 | t = rtnl_dereference(sitn->tunnels[prio][h]); | |
1780 | while (t) { | |
1781 | /* If dev is in the same netns, it has already | |
1782 | * been added to the list by the previous loop. | |
1783 | */ | |
1784 | if (!net_eq(dev_net(t->dev), net)) | |
1785 | unregister_netdevice_queue(t->dev, | |
1786 | head); | |
1787 | t = rtnl_dereference(t->next); | |
1788 | } | |
1789 | } | |
1790 | } | |
1791 | } | |
1792 | ||
1793 | static int __net_init sit_init_net(struct net *net) | |
1794 | { | |
1795 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1796 | struct ip_tunnel *t; | |
1797 | int err; | |
1798 | ||
1799 | sitn->tunnels[0] = sitn->tunnels_wc; | |
1800 | sitn->tunnels[1] = sitn->tunnels_l; | |
1801 | sitn->tunnels[2] = sitn->tunnels_r; | |
1802 | sitn->tunnels[3] = sitn->tunnels_r_l; | |
1803 | ||
1804 | sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", | |
1805 | NET_NAME_UNKNOWN, | |
1806 | ipip6_tunnel_setup); | |
1807 | if (!sitn->fb_tunnel_dev) { | |
1808 | err = -ENOMEM; | |
1809 | goto err_alloc_dev; | |
1810 | } | |
1811 | dev_net_set(sitn->fb_tunnel_dev, net); | |
1812 | sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops; | |
1813 | /* FB netdevice is special: we have one, and only one per netns. | |
1814 | * Allowing to move it to another netns is clearly unsafe. | |
1815 | */ | |
1816 | sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; | |
1817 | ||
1818 | err = register_netdev(sitn->fb_tunnel_dev); | |
1819 | if (err) | |
1820 | goto err_reg_dev; | |
1821 | ||
1822 | ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); | |
1823 | ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); | |
1824 | ||
1825 | t = netdev_priv(sitn->fb_tunnel_dev); | |
1826 | ||
1827 | strcpy(t->parms.name, sitn->fb_tunnel_dev->name); | |
1828 | return 0; | |
1829 | ||
1830 | err_reg_dev: | |
1831 | ipip6_dev_free(sitn->fb_tunnel_dev); | |
1832 | err_alloc_dev: | |
1833 | return err; | |
1834 | } | |
1835 | ||
1836 | static void __net_exit sit_exit_net(struct net *net) | |
1837 | { | |
1838 | LIST_HEAD(list); | |
1839 | ||
1840 | rtnl_lock(); | |
1841 | sit_destroy_tunnels(net, &list); | |
1842 | unregister_netdevice_many(&list); | |
1843 | rtnl_unlock(); | |
1844 | } | |
1845 | ||
1846 | static struct pernet_operations sit_net_ops = { | |
1847 | .init = sit_init_net, | |
1848 | .exit = sit_exit_net, | |
1849 | .id = &sit_net_id, | |
1850 | .size = sizeof(struct sit_net), | |
1851 | }; | |
1852 | ||
1853 | static void __exit sit_cleanup(void) | |
1854 | { | |
1855 | rtnl_link_unregister(&sit_link_ops); | |
1856 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); | |
1857 | xfrm4_tunnel_deregister(&ipip_handler, AF_INET); | |
1858 | ||
1859 | unregister_pernet_device(&sit_net_ops); | |
1860 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ | |
1861 | } | |
1862 | ||
1863 | static int __init sit_init(void) | |
1864 | { | |
1865 | int err; | |
1866 | ||
1867 | pr_info("IPv6 over IPv4 tunneling driver\n"); | |
1868 | ||
1869 | err = register_pernet_device(&sit_net_ops); | |
1870 | if (err < 0) | |
1871 | return err; | |
1872 | err = xfrm4_tunnel_register(&sit_handler, AF_INET6); | |
1873 | if (err < 0) { | |
1874 | pr_info("%s: can't register ip6ip4\n", __func__); | |
1875 | goto xfrm_tunnel_failed; | |
1876 | } | |
1877 | err = xfrm4_tunnel_register(&ipip_handler, AF_INET); | |
1878 | if (err < 0) { | |
1879 | pr_info("%s: can't register ip4ip4\n", __func__); | |
1880 | goto xfrm_tunnel4_failed; | |
1881 | } | |
1882 | err = rtnl_link_register(&sit_link_ops); | |
1883 | if (err < 0) | |
1884 | goto rtnl_link_failed; | |
1885 | ||
1886 | out: | |
1887 | return err; | |
1888 | ||
1889 | rtnl_link_failed: | |
1890 | xfrm4_tunnel_deregister(&ipip_handler, AF_INET); | |
1891 | xfrm_tunnel4_failed: | |
1892 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); | |
1893 | xfrm_tunnel_failed: | |
1894 | unregister_pernet_device(&sit_net_ops); | |
1895 | goto out; | |
1896 | } | |
1897 | ||
1898 | module_init(sit_init); | |
1899 | module_exit(sit_cleanup); | |
1900 | MODULE_LICENSE("GPL"); | |
1901 | MODULE_ALIAS_RTNL_LINK("sit"); | |
1902 | MODULE_ALIAS_NETDEV("sit0"); |