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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 | #include <linux/module.h> | |
21 | #include <linux/capability.h> | |
22 | #include <linux/errno.h> | |
23 | #include <linux/types.h> | |
24 | #include <linux/socket.h> | |
25 | #include <linux/sockios.h> | |
26 | #include <linux/net.h> | |
27 | #include <linux/in6.h> | |
28 | #include <linux/netdevice.h> | |
29 | #include <linux/if_arp.h> | |
30 | #include <linux/icmp.h> | |
31 | #include <linux/slab.h> | |
32 | #include <asm/uaccess.h> | |
33 | #include <linux/init.h> | |
34 | #include <linux/netfilter_ipv4.h> | |
35 | #include <linux/if_ether.h> | |
36 | ||
37 | #include <net/sock.h> | |
38 | #include <net/snmp.h> | |
39 | ||
40 | #include <net/ipv6.h> | |
41 | #include <net/protocol.h> | |
42 | #include <net/transp_v6.h> | |
43 | #include <net/ip6_fib.h> | |
44 | #include <net/ip6_route.h> | |
45 | #include <net/ndisc.h> | |
46 | #include <net/addrconf.h> | |
47 | #include <net/ip.h> | |
48 | #include <net/udp.h> | |
49 | #include <net/icmp.h> | |
50 | #include <net/ipip.h> | |
51 | #include <net/inet_ecn.h> | |
52 | #include <net/xfrm.h> | |
53 | #include <net/dsfield.h> | |
54 | #include <net/net_namespace.h> | |
55 | #include <net/netns/generic.h> | |
56 | ||
57 | /* | |
58 | This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c | |
59 | ||
60 | For comments look at net/ipv4/ip_gre.c --ANK | |
61 | */ | |
62 | ||
63 | #define HASH_SIZE 16 | |
64 | #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) | |
65 | ||
66 | static void ipip6_tunnel_init(struct net_device *dev); | |
67 | static void ipip6_tunnel_setup(struct net_device *dev); | |
68 | ||
69 | static int sit_net_id __read_mostly; | |
70 | struct sit_net { | |
71 | struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE]; | |
72 | struct ip_tunnel __rcu *tunnels_r[HASH_SIZE]; | |
73 | struct ip_tunnel __rcu *tunnels_l[HASH_SIZE]; | |
74 | struct ip_tunnel __rcu *tunnels_wc[1]; | |
75 | struct ip_tunnel __rcu **tunnels[4]; | |
76 | ||
77 | struct net_device *fb_tunnel_dev; | |
78 | }; | |
79 | ||
80 | /* | |
81 | * Locking : hash tables are protected by RCU and RTNL | |
82 | */ | |
83 | ||
84 | #define for_each_ip_tunnel_rcu(start) \ | |
85 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) | |
86 | ||
87 | /* | |
88 | * Must be invoked with rcu_read_lock | |
89 | */ | |
90 | static struct ip_tunnel * ipip6_tunnel_lookup(struct net *net, | |
91 | struct net_device *dev, __be32 remote, __be32 local) | |
92 | { | |
93 | unsigned int h0 = HASH(remote); | |
94 | unsigned int h1 = HASH(local); | |
95 | struct ip_tunnel *t; | |
96 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
97 | ||
98 | for_each_ip_tunnel_rcu(sitn->tunnels_r_l[h0 ^ h1]) { | |
99 | if (local == t->parms.iph.saddr && | |
100 | remote == t->parms.iph.daddr && | |
101 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
102 | (t->dev->flags & IFF_UP)) | |
103 | return t; | |
104 | } | |
105 | for_each_ip_tunnel_rcu(sitn->tunnels_r[h0]) { | |
106 | if (remote == t->parms.iph.daddr && | |
107 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
108 | (t->dev->flags & IFF_UP)) | |
109 | return t; | |
110 | } | |
111 | for_each_ip_tunnel_rcu(sitn->tunnels_l[h1]) { | |
112 | if (local == t->parms.iph.saddr && | |
113 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
114 | (t->dev->flags & IFF_UP)) | |
115 | return t; | |
116 | } | |
117 | t = rcu_dereference(sitn->tunnels_wc[0]); | |
118 | if ((t != NULL) && (t->dev->flags & IFF_UP)) | |
119 | return t; | |
120 | return NULL; | |
121 | } | |
122 | ||
123 | static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn, | |
124 | struct ip_tunnel_parm *parms) | |
125 | { | |
126 | __be32 remote = parms->iph.daddr; | |
127 | __be32 local = parms->iph.saddr; | |
128 | unsigned int h = 0; | |
129 | int prio = 0; | |
130 | ||
131 | if (remote) { | |
132 | prio |= 2; | |
133 | h ^= HASH(remote); | |
134 | } | |
135 | if (local) { | |
136 | prio |= 1; | |
137 | h ^= HASH(local); | |
138 | } | |
139 | return &sitn->tunnels[prio][h]; | |
140 | } | |
141 | ||
142 | static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn, | |
143 | struct ip_tunnel *t) | |
144 | { | |
145 | return __ipip6_bucket(sitn, &t->parms); | |
146 | } | |
147 | ||
148 | static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t) | |
149 | { | |
150 | struct ip_tunnel __rcu **tp; | |
151 | struct ip_tunnel *iter; | |
152 | ||
153 | for (tp = ipip6_bucket(sitn, t); | |
154 | (iter = rtnl_dereference(*tp)) != NULL; | |
155 | tp = &iter->next) { | |
156 | if (t == iter) { | |
157 | rcu_assign_pointer(*tp, t->next); | |
158 | break; | |
159 | } | |
160 | } | |
161 | } | |
162 | ||
163 | static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t) | |
164 | { | |
165 | struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t); | |
166 | ||
167 | rcu_assign_pointer(t->next, rtnl_dereference(*tp)); | |
168 | rcu_assign_pointer(*tp, t); | |
169 | } | |
170 | ||
171 | static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn) | |
172 | { | |
173 | #ifdef CONFIG_IPV6_SIT_6RD | |
174 | struct ip_tunnel *t = netdev_priv(dev); | |
175 | ||
176 | if (t->dev == sitn->fb_tunnel_dev) { | |
177 | ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0); | |
178 | t->ip6rd.relay_prefix = 0; | |
179 | t->ip6rd.prefixlen = 16; | |
180 | t->ip6rd.relay_prefixlen = 0; | |
181 | } else { | |
182 | struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev); | |
183 | memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd)); | |
184 | } | |
185 | #endif | |
186 | } | |
187 | ||
188 | static struct ip_tunnel *ipip6_tunnel_locate(struct net *net, | |
189 | struct ip_tunnel_parm *parms, int create) | |
190 | { | |
191 | __be32 remote = parms->iph.daddr; | |
192 | __be32 local = parms->iph.saddr; | |
193 | struct ip_tunnel *t, *nt; | |
194 | struct ip_tunnel __rcu **tp; | |
195 | struct net_device *dev; | |
196 | char name[IFNAMSIZ]; | |
197 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
198 | ||
199 | for (tp = __ipip6_bucket(sitn, parms); | |
200 | (t = rtnl_dereference(*tp)) != NULL; | |
201 | tp = &t->next) { | |
202 | if (local == t->parms.iph.saddr && | |
203 | remote == t->parms.iph.daddr && | |
204 | parms->link == t->parms.link) { | |
205 | if (create) | |
206 | return NULL; | |
207 | else | |
208 | return t; | |
209 | } | |
210 | } | |
211 | if (!create) | |
212 | goto failed; | |
213 | ||
214 | if (parms->name[0]) | |
215 | strlcpy(name, parms->name, IFNAMSIZ); | |
216 | else | |
217 | sprintf(name, "sit%%d"); | |
218 | ||
219 | dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup); | |
220 | if (dev == NULL) | |
221 | return NULL; | |
222 | ||
223 | dev_net_set(dev, net); | |
224 | ||
225 | if (strchr(name, '%')) { | |
226 | if (dev_alloc_name(dev, name) < 0) | |
227 | goto failed_free; | |
228 | } | |
229 | ||
230 | nt = netdev_priv(dev); | |
231 | ||
232 | nt->parms = *parms; | |
233 | ipip6_tunnel_init(dev); | |
234 | ipip6_tunnel_clone_6rd(dev, sitn); | |
235 | ||
236 | if (parms->i_flags & SIT_ISATAP) | |
237 | dev->priv_flags |= IFF_ISATAP; | |
238 | ||
239 | if (register_netdevice(dev) < 0) | |
240 | goto failed_free; | |
241 | ||
242 | dev_hold(dev); | |
243 | ||
244 | ipip6_tunnel_link(sitn, nt); | |
245 | return nt; | |
246 | ||
247 | failed_free: | |
248 | free_netdev(dev); | |
249 | failed: | |
250 | return NULL; | |
251 | } | |
252 | ||
253 | #define for_each_prl_rcu(start) \ | |
254 | for (prl = rcu_dereference(start); \ | |
255 | prl; \ | |
256 | prl = rcu_dereference(prl->next)) | |
257 | ||
258 | static struct ip_tunnel_prl_entry * | |
259 | __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) | |
260 | { | |
261 | struct ip_tunnel_prl_entry *prl; | |
262 | ||
263 | for_each_prl_rcu(t->prl) | |
264 | if (prl->addr == addr) | |
265 | break; | |
266 | return prl; | |
267 | ||
268 | } | |
269 | ||
270 | static int ipip6_tunnel_get_prl(struct ip_tunnel *t, | |
271 | struct ip_tunnel_prl __user *a) | |
272 | { | |
273 | struct ip_tunnel_prl kprl, *kp; | |
274 | struct ip_tunnel_prl_entry *prl; | |
275 | unsigned int cmax, c = 0, ca, len; | |
276 | int ret = 0; | |
277 | ||
278 | if (copy_from_user(&kprl, a, sizeof(kprl))) | |
279 | return -EFAULT; | |
280 | cmax = kprl.datalen / sizeof(kprl); | |
281 | if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) | |
282 | cmax = 1; | |
283 | ||
284 | /* For simple GET or for root users, | |
285 | * we try harder to allocate. | |
286 | */ | |
287 | kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? | |
288 | kcalloc(cmax, sizeof(*kp), GFP_KERNEL) : | |
289 | NULL; | |
290 | ||
291 | rcu_read_lock(); | |
292 | ||
293 | ca = t->prl_count < cmax ? t->prl_count : cmax; | |
294 | ||
295 | if (!kp) { | |
296 | /* We don't try hard to allocate much memory for | |
297 | * non-root users. | |
298 | * For root users, retry allocating enough memory for | |
299 | * the answer. | |
300 | */ | |
301 | kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC); | |
302 | if (!kp) { | |
303 | ret = -ENOMEM; | |
304 | goto out; | |
305 | } | |
306 | } | |
307 | ||
308 | c = 0; | |
309 | for_each_prl_rcu(t->prl) { | |
310 | if (c >= cmax) | |
311 | break; | |
312 | if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) | |
313 | continue; | |
314 | kp[c].addr = prl->addr; | |
315 | kp[c].flags = prl->flags; | |
316 | c++; | |
317 | if (kprl.addr != htonl(INADDR_ANY)) | |
318 | break; | |
319 | } | |
320 | out: | |
321 | rcu_read_unlock(); | |
322 | ||
323 | len = sizeof(*kp) * c; | |
324 | ret = 0; | |
325 | if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) | |
326 | ret = -EFAULT; | |
327 | ||
328 | kfree(kp); | |
329 | ||
330 | return ret; | |
331 | } | |
332 | ||
333 | static int | |
334 | ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) | |
335 | { | |
336 | struct ip_tunnel_prl_entry *p; | |
337 | int err = 0; | |
338 | ||
339 | if (a->addr == htonl(INADDR_ANY)) | |
340 | return -EINVAL; | |
341 | ||
342 | ASSERT_RTNL(); | |
343 | ||
344 | for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) { | |
345 | if (p->addr == a->addr) { | |
346 | if (chg) { | |
347 | p->flags = a->flags; | |
348 | goto out; | |
349 | } | |
350 | err = -EEXIST; | |
351 | goto out; | |
352 | } | |
353 | } | |
354 | ||
355 | if (chg) { | |
356 | err = -ENXIO; | |
357 | goto out; | |
358 | } | |
359 | ||
360 | p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); | |
361 | if (!p) { | |
362 | err = -ENOBUFS; | |
363 | goto out; | |
364 | } | |
365 | ||
366 | p->next = t->prl; | |
367 | p->addr = a->addr; | |
368 | p->flags = a->flags; | |
369 | t->prl_count++; | |
370 | rcu_assign_pointer(t->prl, p); | |
371 | out: | |
372 | return err; | |
373 | } | |
374 | ||
375 | static void prl_entry_destroy_rcu(struct rcu_head *head) | |
376 | { | |
377 | kfree(container_of(head, struct ip_tunnel_prl_entry, rcu_head)); | |
378 | } | |
379 | ||
380 | static void prl_list_destroy_rcu(struct rcu_head *head) | |
381 | { | |
382 | struct ip_tunnel_prl_entry *p, *n; | |
383 | ||
384 | p = container_of(head, struct ip_tunnel_prl_entry, rcu_head); | |
385 | do { | |
386 | n = p->next; | |
387 | kfree(p); | |
388 | p = n; | |
389 | } while (p); | |
390 | } | |
391 | ||
392 | static int | |
393 | ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) | |
394 | { | |
395 | struct ip_tunnel_prl_entry *x, **p; | |
396 | int err = 0; | |
397 | ||
398 | ASSERT_RTNL(); | |
399 | ||
400 | if (a && a->addr != htonl(INADDR_ANY)) { | |
401 | for (p = &t->prl; *p; p = &(*p)->next) { | |
402 | if ((*p)->addr == a->addr) { | |
403 | x = *p; | |
404 | *p = x->next; | |
405 | call_rcu(&x->rcu_head, prl_entry_destroy_rcu); | |
406 | t->prl_count--; | |
407 | goto out; | |
408 | } | |
409 | } | |
410 | err = -ENXIO; | |
411 | } else { | |
412 | if (t->prl) { | |
413 | t->prl_count = 0; | |
414 | x = t->prl; | |
415 | call_rcu(&x->rcu_head, prl_list_destroy_rcu); | |
416 | t->prl = NULL; | |
417 | } | |
418 | } | |
419 | out: | |
420 | return err; | |
421 | } | |
422 | ||
423 | static int | |
424 | isatap_chksrc(struct sk_buff *skb, struct iphdr *iph, struct ip_tunnel *t) | |
425 | { | |
426 | struct ip_tunnel_prl_entry *p; | |
427 | int ok = 1; | |
428 | ||
429 | rcu_read_lock(); | |
430 | p = __ipip6_tunnel_locate_prl(t, iph->saddr); | |
431 | if (p) { | |
432 | if (p->flags & PRL_DEFAULT) | |
433 | skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; | |
434 | else | |
435 | skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; | |
436 | } else { | |
437 | struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; | |
438 | if (ipv6_addr_is_isatap(addr6) && | |
439 | (addr6->s6_addr32[3] == iph->saddr) && | |
440 | ipv6_chk_prefix(addr6, t->dev)) | |
441 | skb->ndisc_nodetype = NDISC_NODETYPE_HOST; | |
442 | else | |
443 | ok = 0; | |
444 | } | |
445 | rcu_read_unlock(); | |
446 | return ok; | |
447 | } | |
448 | ||
449 | static void ipip6_tunnel_uninit(struct net_device *dev) | |
450 | { | |
451 | struct net *net = dev_net(dev); | |
452 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
453 | ||
454 | if (dev == sitn->fb_tunnel_dev) { | |
455 | rcu_assign_pointer(sitn->tunnels_wc[0], NULL); | |
456 | } else { | |
457 | ipip6_tunnel_unlink(sitn, netdev_priv(dev)); | |
458 | ipip6_tunnel_del_prl(netdev_priv(dev), NULL); | |
459 | } | |
460 | dev_put(dev); | |
461 | } | |
462 | ||
463 | ||
464 | static int ipip6_err(struct sk_buff *skb, u32 info) | |
465 | { | |
466 | ||
467 | /* All the routers (except for Linux) return only | |
468 | 8 bytes of packet payload. It means, that precise relaying of | |
469 | ICMP in the real Internet is absolutely infeasible. | |
470 | */ | |
471 | struct iphdr *iph = (struct iphdr*)skb->data; | |
472 | const int type = icmp_hdr(skb)->type; | |
473 | const int code = icmp_hdr(skb)->code; | |
474 | struct ip_tunnel *t; | |
475 | int err; | |
476 | ||
477 | switch (type) { | |
478 | default: | |
479 | case ICMP_PARAMETERPROB: | |
480 | return 0; | |
481 | ||
482 | case ICMP_DEST_UNREACH: | |
483 | switch (code) { | |
484 | case ICMP_SR_FAILED: | |
485 | case ICMP_PORT_UNREACH: | |
486 | /* Impossible event. */ | |
487 | return 0; | |
488 | case ICMP_FRAG_NEEDED: | |
489 | /* Soft state for pmtu is maintained by IP core. */ | |
490 | return 0; | |
491 | default: | |
492 | /* All others are translated to HOST_UNREACH. | |
493 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
494 | I believe they are just ether pollution. --ANK | |
495 | */ | |
496 | break; | |
497 | } | |
498 | break; | |
499 | case ICMP_TIME_EXCEEDED: | |
500 | if (code != ICMP_EXC_TTL) | |
501 | return 0; | |
502 | break; | |
503 | } | |
504 | ||
505 | err = -ENOENT; | |
506 | ||
507 | rcu_read_lock(); | |
508 | t = ipip6_tunnel_lookup(dev_net(skb->dev), | |
509 | skb->dev, | |
510 | iph->daddr, | |
511 | iph->saddr); | |
512 | if (t == NULL || t->parms.iph.daddr == 0) | |
513 | goto out; | |
514 | ||
515 | err = 0; | |
516 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) | |
517 | goto out; | |
518 | ||
519 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) | |
520 | t->err_count++; | |
521 | else | |
522 | t->err_count = 1; | |
523 | t->err_time = jiffies; | |
524 | out: | |
525 | rcu_read_unlock(); | |
526 | return err; | |
527 | } | |
528 | ||
529 | static inline void ipip6_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb) | |
530 | { | |
531 | if (INET_ECN_is_ce(iph->tos)) | |
532 | IP6_ECN_set_ce(ipv6_hdr(skb)); | |
533 | } | |
534 | ||
535 | static int ipip6_rcv(struct sk_buff *skb) | |
536 | { | |
537 | struct iphdr *iph; | |
538 | struct ip_tunnel *tunnel; | |
539 | ||
540 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
541 | goto out; | |
542 | ||
543 | iph = ip_hdr(skb); | |
544 | ||
545 | rcu_read_lock(); | |
546 | tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, | |
547 | iph->saddr, iph->daddr); | |
548 | if (tunnel != NULL) { | |
549 | secpath_reset(skb); | |
550 | skb->mac_header = skb->network_header; | |
551 | skb_reset_network_header(skb); | |
552 | IPCB(skb)->flags = 0; | |
553 | skb->protocol = htons(ETH_P_IPV6); | |
554 | skb->pkt_type = PACKET_HOST; | |
555 | ||
556 | if ((tunnel->dev->priv_flags & IFF_ISATAP) && | |
557 | !isatap_chksrc(skb, iph, tunnel)) { | |
558 | tunnel->dev->stats.rx_errors++; | |
559 | rcu_read_unlock(); | |
560 | kfree_skb(skb); | |
561 | return 0; | |
562 | } | |
563 | ||
564 | skb_tunnel_rx(skb, tunnel->dev); | |
565 | ||
566 | ipip6_ecn_decapsulate(iph, skb); | |
567 | netif_rx(skb); | |
568 | rcu_read_unlock(); | |
569 | return 0; | |
570 | } | |
571 | ||
572 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); | |
573 | rcu_read_unlock(); | |
574 | out: | |
575 | kfree_skb(skb); | |
576 | return 0; | |
577 | } | |
578 | ||
579 | /* | |
580 | * Returns the embedded IPv4 address if the IPv6 address | |
581 | * comes from 6rd / 6to4 (RFC 3056) addr space. | |
582 | */ | |
583 | static inline | |
584 | __be32 try_6rd(struct in6_addr *v6dst, struct ip_tunnel *tunnel) | |
585 | { | |
586 | __be32 dst = 0; | |
587 | ||
588 | #ifdef CONFIG_IPV6_SIT_6RD | |
589 | if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, | |
590 | tunnel->ip6rd.prefixlen)) { | |
591 | unsigned int pbw0, pbi0; | |
592 | int pbi1; | |
593 | u32 d; | |
594 | ||
595 | pbw0 = tunnel->ip6rd.prefixlen >> 5; | |
596 | pbi0 = tunnel->ip6rd.prefixlen & 0x1f; | |
597 | ||
598 | d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> | |
599 | tunnel->ip6rd.relay_prefixlen; | |
600 | ||
601 | pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; | |
602 | if (pbi1 > 0) | |
603 | d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> | |
604 | (32 - pbi1); | |
605 | ||
606 | dst = tunnel->ip6rd.relay_prefix | htonl(d); | |
607 | } | |
608 | #else | |
609 | if (v6dst->s6_addr16[0] == htons(0x2002)) { | |
610 | /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ | |
611 | memcpy(&dst, &v6dst->s6_addr16[1], 4); | |
612 | } | |
613 | #endif | |
614 | return dst; | |
615 | } | |
616 | ||
617 | /* | |
618 | * This function assumes it is being called from dev_queue_xmit() | |
619 | * and that skb is filled properly by that function. | |
620 | */ | |
621 | ||
622 | static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, | |
623 | struct net_device *dev) | |
624 | { | |
625 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
626 | struct net_device_stats *stats = &dev->stats; | |
627 | struct netdev_queue *txq = netdev_get_tx_queue(dev, 0); | |
628 | struct iphdr *tiph = &tunnel->parms.iph; | |
629 | struct ipv6hdr *iph6 = ipv6_hdr(skb); | |
630 | u8 tos = tunnel->parms.iph.tos; | |
631 | __be16 df = tiph->frag_off; | |
632 | struct rtable *rt; /* Route to the other host */ | |
633 | struct net_device *tdev; /* Device to other host */ | |
634 | struct iphdr *iph; /* Our new IP header */ | |
635 | unsigned int max_headroom; /* The extra header space needed */ | |
636 | __be32 dst = tiph->daddr; | |
637 | int mtu; | |
638 | struct in6_addr *addr6; | |
639 | int addr_type; | |
640 | ||
641 | if (skb->protocol != htons(ETH_P_IPV6)) | |
642 | goto tx_error; | |
643 | ||
644 | /* ISATAP (RFC4214) - must come before 6to4 */ | |
645 | if (dev->priv_flags & IFF_ISATAP) { | |
646 | struct neighbour *neigh = NULL; | |
647 | ||
648 | if (skb_dst(skb)) | |
649 | neigh = skb_dst(skb)->neighbour; | |
650 | ||
651 | if (neigh == NULL) { | |
652 | if (net_ratelimit()) | |
653 | printk(KERN_DEBUG "sit: nexthop == NULL\n"); | |
654 | goto tx_error; | |
655 | } | |
656 | ||
657 | addr6 = (struct in6_addr*)&neigh->primary_key; | |
658 | addr_type = ipv6_addr_type(addr6); | |
659 | ||
660 | if ((addr_type & IPV6_ADDR_UNICAST) && | |
661 | ipv6_addr_is_isatap(addr6)) | |
662 | dst = addr6->s6_addr32[3]; | |
663 | else | |
664 | goto tx_error; | |
665 | } | |
666 | ||
667 | if (!dst) | |
668 | dst = try_6rd(&iph6->daddr, tunnel); | |
669 | ||
670 | if (!dst) { | |
671 | struct neighbour *neigh = NULL; | |
672 | ||
673 | if (skb_dst(skb)) | |
674 | neigh = skb_dst(skb)->neighbour; | |
675 | ||
676 | if (neigh == NULL) { | |
677 | if (net_ratelimit()) | |
678 | printk(KERN_DEBUG "sit: nexthop == NULL\n"); | |
679 | goto tx_error; | |
680 | } | |
681 | ||
682 | addr6 = (struct in6_addr*)&neigh->primary_key; | |
683 | addr_type = ipv6_addr_type(addr6); | |
684 | ||
685 | if (addr_type == IPV6_ADDR_ANY) { | |
686 | addr6 = &ipv6_hdr(skb)->daddr; | |
687 | addr_type = ipv6_addr_type(addr6); | |
688 | } | |
689 | ||
690 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) | |
691 | goto tx_error_icmp; | |
692 | ||
693 | dst = addr6->s6_addr32[3]; | |
694 | } | |
695 | ||
696 | { | |
697 | struct flowi fl = { .nl_u = { .ip4_u = | |
698 | { .daddr = dst, | |
699 | .saddr = tiph->saddr, | |
700 | .tos = RT_TOS(tos) } }, | |
701 | .oif = tunnel->parms.link, | |
702 | .proto = IPPROTO_IPV6 }; | |
703 | if (ip_route_output_key(dev_net(dev), &rt, &fl)) { | |
704 | stats->tx_carrier_errors++; | |
705 | goto tx_error_icmp; | |
706 | } | |
707 | } | |
708 | if (rt->rt_type != RTN_UNICAST) { | |
709 | ip_rt_put(rt); | |
710 | stats->tx_carrier_errors++; | |
711 | goto tx_error_icmp; | |
712 | } | |
713 | tdev = rt->dst.dev; | |
714 | ||
715 | if (tdev == dev) { | |
716 | ip_rt_put(rt); | |
717 | stats->collisions++; | |
718 | goto tx_error; | |
719 | } | |
720 | ||
721 | if (df) { | |
722 | mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr); | |
723 | ||
724 | if (mtu < 68) { | |
725 | stats->collisions++; | |
726 | ip_rt_put(rt); | |
727 | goto tx_error; | |
728 | } | |
729 | ||
730 | if (mtu < IPV6_MIN_MTU) { | |
731 | mtu = IPV6_MIN_MTU; | |
732 | df = 0; | |
733 | } | |
734 | ||
735 | if (tunnel->parms.iph.daddr && skb_dst(skb)) | |
736 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); | |
737 | ||
738 | if (skb->len > mtu) { | |
739 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); | |
740 | ip_rt_put(rt); | |
741 | goto tx_error; | |
742 | } | |
743 | } | |
744 | ||
745 | if (tunnel->err_count > 0) { | |
746 | if (time_before(jiffies, | |
747 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
748 | tunnel->err_count--; | |
749 | dst_link_failure(skb); | |
750 | } else | |
751 | tunnel->err_count = 0; | |
752 | } | |
753 | ||
754 | /* | |
755 | * Okay, now see if we can stuff it in the buffer as-is. | |
756 | */ | |
757 | max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr); | |
758 | ||
759 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || | |
760 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
761 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); | |
762 | if (!new_skb) { | |
763 | ip_rt_put(rt); | |
764 | txq->tx_dropped++; | |
765 | dev_kfree_skb(skb); | |
766 | return NETDEV_TX_OK; | |
767 | } | |
768 | if (skb->sk) | |
769 | skb_set_owner_w(new_skb, skb->sk); | |
770 | dev_kfree_skb(skb); | |
771 | skb = new_skb; | |
772 | iph6 = ipv6_hdr(skb); | |
773 | } | |
774 | ||
775 | skb->transport_header = skb->network_header; | |
776 | skb_push(skb, sizeof(struct iphdr)); | |
777 | skb_reset_network_header(skb); | |
778 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); | |
779 | IPCB(skb)->flags = 0; | |
780 | skb_dst_drop(skb); | |
781 | skb_dst_set(skb, &rt->dst); | |
782 | ||
783 | /* | |
784 | * Push down and install the IPIP header. | |
785 | */ | |
786 | ||
787 | iph = ip_hdr(skb); | |
788 | iph->version = 4; | |
789 | iph->ihl = sizeof(struct iphdr)>>2; | |
790 | iph->frag_off = df; | |
791 | iph->protocol = IPPROTO_IPV6; | |
792 | iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); | |
793 | iph->daddr = rt->rt_dst; | |
794 | iph->saddr = rt->rt_src; | |
795 | ||
796 | if ((iph->ttl = tiph->ttl) == 0) | |
797 | iph->ttl = iph6->hop_limit; | |
798 | ||
799 | nf_reset(skb); | |
800 | ||
801 | IPTUNNEL_XMIT(); | |
802 | return NETDEV_TX_OK; | |
803 | ||
804 | tx_error_icmp: | |
805 | dst_link_failure(skb); | |
806 | tx_error: | |
807 | stats->tx_errors++; | |
808 | dev_kfree_skb(skb); | |
809 | return NETDEV_TX_OK; | |
810 | } | |
811 | ||
812 | static void ipip6_tunnel_bind_dev(struct net_device *dev) | |
813 | { | |
814 | struct net_device *tdev = NULL; | |
815 | struct ip_tunnel *tunnel; | |
816 | struct iphdr *iph; | |
817 | ||
818 | tunnel = netdev_priv(dev); | |
819 | iph = &tunnel->parms.iph; | |
820 | ||
821 | if (iph->daddr) { | |
822 | struct flowi fl = { .nl_u = { .ip4_u = | |
823 | { .daddr = iph->daddr, | |
824 | .saddr = iph->saddr, | |
825 | .tos = RT_TOS(iph->tos) } }, | |
826 | .oif = tunnel->parms.link, | |
827 | .proto = IPPROTO_IPV6 }; | |
828 | struct rtable *rt; | |
829 | if (!ip_route_output_key(dev_net(dev), &rt, &fl)) { | |
830 | tdev = rt->dst.dev; | |
831 | ip_rt_put(rt); | |
832 | } | |
833 | dev->flags |= IFF_POINTOPOINT; | |
834 | } | |
835 | ||
836 | if (!tdev && tunnel->parms.link) | |
837 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); | |
838 | ||
839 | if (tdev) { | |
840 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); | |
841 | dev->mtu = tdev->mtu - sizeof(struct iphdr); | |
842 | if (dev->mtu < IPV6_MIN_MTU) | |
843 | dev->mtu = IPV6_MIN_MTU; | |
844 | } | |
845 | dev->iflink = tunnel->parms.link; | |
846 | } | |
847 | ||
848 | static int | |
849 | ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
850 | { | |
851 | int err = 0; | |
852 | struct ip_tunnel_parm p; | |
853 | struct ip_tunnel_prl prl; | |
854 | struct ip_tunnel *t; | |
855 | struct net *net = dev_net(dev); | |
856 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
857 | #ifdef CONFIG_IPV6_SIT_6RD | |
858 | struct ip_tunnel_6rd ip6rd; | |
859 | #endif | |
860 | ||
861 | switch (cmd) { | |
862 | case SIOCGETTUNNEL: | |
863 | #ifdef CONFIG_IPV6_SIT_6RD | |
864 | case SIOCGET6RD: | |
865 | #endif | |
866 | t = NULL; | |
867 | if (dev == sitn->fb_tunnel_dev) { | |
868 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { | |
869 | err = -EFAULT; | |
870 | break; | |
871 | } | |
872 | t = ipip6_tunnel_locate(net, &p, 0); | |
873 | } | |
874 | if (t == NULL) | |
875 | t = netdev_priv(dev); | |
876 | ||
877 | err = -EFAULT; | |
878 | if (cmd == SIOCGETTUNNEL) { | |
879 | memcpy(&p, &t->parms, sizeof(p)); | |
880 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, | |
881 | sizeof(p))) | |
882 | goto done; | |
883 | #ifdef CONFIG_IPV6_SIT_6RD | |
884 | } else { | |
885 | ipv6_addr_copy(&ip6rd.prefix, &t->ip6rd.prefix); | |
886 | ip6rd.relay_prefix = t->ip6rd.relay_prefix; | |
887 | ip6rd.prefixlen = t->ip6rd.prefixlen; | |
888 | ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; | |
889 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd, | |
890 | sizeof(ip6rd))) | |
891 | goto done; | |
892 | #endif | |
893 | } | |
894 | err = 0; | |
895 | break; | |
896 | ||
897 | case SIOCADDTUNNEL: | |
898 | case SIOCCHGTUNNEL: | |
899 | err = -EPERM; | |
900 | if (!capable(CAP_NET_ADMIN)) | |
901 | goto done; | |
902 | ||
903 | err = -EFAULT; | |
904 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
905 | goto done; | |
906 | ||
907 | err = -EINVAL; | |
908 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 || | |
909 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) | |
910 | goto done; | |
911 | if (p.iph.ttl) | |
912 | p.iph.frag_off |= htons(IP_DF); | |
913 | ||
914 | t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); | |
915 | ||
916 | if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { | |
917 | if (t != NULL) { | |
918 | if (t->dev != dev) { | |
919 | err = -EEXIST; | |
920 | break; | |
921 | } | |
922 | } else { | |
923 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || | |
924 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { | |
925 | err = -EINVAL; | |
926 | break; | |
927 | } | |
928 | t = netdev_priv(dev); | |
929 | ipip6_tunnel_unlink(sitn, t); | |
930 | t->parms.iph.saddr = p.iph.saddr; | |
931 | t->parms.iph.daddr = p.iph.daddr; | |
932 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
933 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
934 | ipip6_tunnel_link(sitn, t); | |
935 | netdev_state_change(dev); | |
936 | } | |
937 | } | |
938 | ||
939 | if (t) { | |
940 | err = 0; | |
941 | if (cmd == SIOCCHGTUNNEL) { | |
942 | t->parms.iph.ttl = p.iph.ttl; | |
943 | t->parms.iph.tos = p.iph.tos; | |
944 | if (t->parms.link != p.link) { | |
945 | t->parms.link = p.link; | |
946 | ipip6_tunnel_bind_dev(dev); | |
947 | netdev_state_change(dev); | |
948 | } | |
949 | } | |
950 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) | |
951 | err = -EFAULT; | |
952 | } else | |
953 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
954 | break; | |
955 | ||
956 | case SIOCDELTUNNEL: | |
957 | err = -EPERM; | |
958 | if (!capable(CAP_NET_ADMIN)) | |
959 | goto done; | |
960 | ||
961 | if (dev == sitn->fb_tunnel_dev) { | |
962 | err = -EFAULT; | |
963 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
964 | goto done; | |
965 | err = -ENOENT; | |
966 | if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL) | |
967 | goto done; | |
968 | err = -EPERM; | |
969 | if (t == netdev_priv(sitn->fb_tunnel_dev)) | |
970 | goto done; | |
971 | dev = t->dev; | |
972 | } | |
973 | unregister_netdevice(dev); | |
974 | err = 0; | |
975 | break; | |
976 | ||
977 | case SIOCGETPRL: | |
978 | err = -EINVAL; | |
979 | if (dev == sitn->fb_tunnel_dev) | |
980 | goto done; | |
981 | err = -ENOENT; | |
982 | if (!(t = netdev_priv(dev))) | |
983 | goto done; | |
984 | err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data); | |
985 | break; | |
986 | ||
987 | case SIOCADDPRL: | |
988 | case SIOCDELPRL: | |
989 | case SIOCCHGPRL: | |
990 | err = -EPERM; | |
991 | if (!capable(CAP_NET_ADMIN)) | |
992 | goto done; | |
993 | err = -EINVAL; | |
994 | if (dev == sitn->fb_tunnel_dev) | |
995 | goto done; | |
996 | err = -EFAULT; | |
997 | if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) | |
998 | goto done; | |
999 | err = -ENOENT; | |
1000 | if (!(t = netdev_priv(dev))) | |
1001 | goto done; | |
1002 | ||
1003 | switch (cmd) { | |
1004 | case SIOCDELPRL: | |
1005 | err = ipip6_tunnel_del_prl(t, &prl); | |
1006 | break; | |
1007 | case SIOCADDPRL: | |
1008 | case SIOCCHGPRL: | |
1009 | err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); | |
1010 | break; | |
1011 | } | |
1012 | netdev_state_change(dev); | |
1013 | break; | |
1014 | ||
1015 | #ifdef CONFIG_IPV6_SIT_6RD | |
1016 | case SIOCADD6RD: | |
1017 | case SIOCCHG6RD: | |
1018 | case SIOCDEL6RD: | |
1019 | err = -EPERM; | |
1020 | if (!capable(CAP_NET_ADMIN)) | |
1021 | goto done; | |
1022 | ||
1023 | err = -EFAULT; | |
1024 | if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data, | |
1025 | sizeof(ip6rd))) | |
1026 | goto done; | |
1027 | ||
1028 | t = netdev_priv(dev); | |
1029 | ||
1030 | if (cmd != SIOCDEL6RD) { | |
1031 | struct in6_addr prefix; | |
1032 | __be32 relay_prefix; | |
1033 | ||
1034 | err = -EINVAL; | |
1035 | if (ip6rd.relay_prefixlen > 32 || | |
1036 | ip6rd.prefixlen + (32 - ip6rd.relay_prefixlen) > 64) | |
1037 | goto done; | |
1038 | ||
1039 | ipv6_addr_prefix(&prefix, &ip6rd.prefix, | |
1040 | ip6rd.prefixlen); | |
1041 | if (!ipv6_addr_equal(&prefix, &ip6rd.prefix)) | |
1042 | goto done; | |
1043 | if (ip6rd.relay_prefixlen) | |
1044 | relay_prefix = ip6rd.relay_prefix & | |
1045 | htonl(0xffffffffUL << | |
1046 | (32 - ip6rd.relay_prefixlen)); | |
1047 | else | |
1048 | relay_prefix = 0; | |
1049 | if (relay_prefix != ip6rd.relay_prefix) | |
1050 | goto done; | |
1051 | ||
1052 | ipv6_addr_copy(&t->ip6rd.prefix, &prefix); | |
1053 | t->ip6rd.relay_prefix = relay_prefix; | |
1054 | t->ip6rd.prefixlen = ip6rd.prefixlen; | |
1055 | t->ip6rd.relay_prefixlen = ip6rd.relay_prefixlen; | |
1056 | } else | |
1057 | ipip6_tunnel_clone_6rd(dev, sitn); | |
1058 | ||
1059 | err = 0; | |
1060 | break; | |
1061 | #endif | |
1062 | ||
1063 | default: | |
1064 | err = -EINVAL; | |
1065 | } | |
1066 | ||
1067 | done: | |
1068 | return err; | |
1069 | } | |
1070 | ||
1071 | static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu) | |
1072 | { | |
1073 | if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr)) | |
1074 | return -EINVAL; | |
1075 | dev->mtu = new_mtu; | |
1076 | return 0; | |
1077 | } | |
1078 | ||
1079 | static const struct net_device_ops ipip6_netdev_ops = { | |
1080 | .ndo_uninit = ipip6_tunnel_uninit, | |
1081 | .ndo_start_xmit = ipip6_tunnel_xmit, | |
1082 | .ndo_do_ioctl = ipip6_tunnel_ioctl, | |
1083 | .ndo_change_mtu = ipip6_tunnel_change_mtu, | |
1084 | }; | |
1085 | ||
1086 | static void ipip6_tunnel_setup(struct net_device *dev) | |
1087 | { | |
1088 | dev->netdev_ops = &ipip6_netdev_ops; | |
1089 | dev->destructor = free_netdev; | |
1090 | ||
1091 | dev->type = ARPHRD_SIT; | |
1092 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); | |
1093 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); | |
1094 | dev->flags = IFF_NOARP; | |
1095 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; | |
1096 | dev->iflink = 0; | |
1097 | dev->addr_len = 4; | |
1098 | dev->features |= NETIF_F_NETNS_LOCAL; | |
1099 | } | |
1100 | ||
1101 | static void ipip6_tunnel_init(struct net_device *dev) | |
1102 | { | |
1103 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1104 | ||
1105 | tunnel->dev = dev; | |
1106 | strcpy(tunnel->parms.name, dev->name); | |
1107 | ||
1108 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
1109 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
1110 | ||
1111 | ipip6_tunnel_bind_dev(dev); | |
1112 | } | |
1113 | ||
1114 | static void __net_init ipip6_fb_tunnel_init(struct net_device *dev) | |
1115 | { | |
1116 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1117 | struct iphdr *iph = &tunnel->parms.iph; | |
1118 | struct net *net = dev_net(dev); | |
1119 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1120 | ||
1121 | tunnel->dev = dev; | |
1122 | strcpy(tunnel->parms.name, dev->name); | |
1123 | ||
1124 | iph->version = 4; | |
1125 | iph->protocol = IPPROTO_IPV6; | |
1126 | iph->ihl = 5; | |
1127 | iph->ttl = 64; | |
1128 | ||
1129 | dev_hold(dev); | |
1130 | sitn->tunnels_wc[0] = tunnel; | |
1131 | } | |
1132 | ||
1133 | static struct xfrm_tunnel sit_handler __read_mostly = { | |
1134 | .handler = ipip6_rcv, | |
1135 | .err_handler = ipip6_err, | |
1136 | .priority = 1, | |
1137 | }; | |
1138 | ||
1139 | static void __net_exit sit_destroy_tunnels(struct sit_net *sitn, struct list_head *head) | |
1140 | { | |
1141 | int prio; | |
1142 | ||
1143 | for (prio = 1; prio < 4; prio++) { | |
1144 | int h; | |
1145 | for (h = 0; h < HASH_SIZE; h++) { | |
1146 | struct ip_tunnel *t = sitn->tunnels[prio][h]; | |
1147 | ||
1148 | while (t != NULL) { | |
1149 | unregister_netdevice_queue(t->dev, head); | |
1150 | t = t->next; | |
1151 | } | |
1152 | } | |
1153 | } | |
1154 | } | |
1155 | ||
1156 | static int __net_init sit_init_net(struct net *net) | |
1157 | { | |
1158 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1159 | int err; | |
1160 | ||
1161 | sitn->tunnels[0] = sitn->tunnels_wc; | |
1162 | sitn->tunnels[1] = sitn->tunnels_l; | |
1163 | sitn->tunnels[2] = sitn->tunnels_r; | |
1164 | sitn->tunnels[3] = sitn->tunnels_r_l; | |
1165 | ||
1166 | sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", | |
1167 | ipip6_tunnel_setup); | |
1168 | if (!sitn->fb_tunnel_dev) { | |
1169 | err = -ENOMEM; | |
1170 | goto err_alloc_dev; | |
1171 | } | |
1172 | dev_net_set(sitn->fb_tunnel_dev, net); | |
1173 | ||
1174 | ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); | |
1175 | ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); | |
1176 | ||
1177 | if ((err = register_netdev(sitn->fb_tunnel_dev))) | |
1178 | goto err_reg_dev; | |
1179 | ||
1180 | return 0; | |
1181 | ||
1182 | err_reg_dev: | |
1183 | dev_put(sitn->fb_tunnel_dev); | |
1184 | free_netdev(sitn->fb_tunnel_dev); | |
1185 | err_alloc_dev: | |
1186 | return err; | |
1187 | } | |
1188 | ||
1189 | static void __net_exit sit_exit_net(struct net *net) | |
1190 | { | |
1191 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1192 | LIST_HEAD(list); | |
1193 | ||
1194 | rtnl_lock(); | |
1195 | sit_destroy_tunnels(sitn, &list); | |
1196 | unregister_netdevice_queue(sitn->fb_tunnel_dev, &list); | |
1197 | unregister_netdevice_many(&list); | |
1198 | rtnl_unlock(); | |
1199 | } | |
1200 | ||
1201 | static struct pernet_operations sit_net_ops = { | |
1202 | .init = sit_init_net, | |
1203 | .exit = sit_exit_net, | |
1204 | .id = &sit_net_id, | |
1205 | .size = sizeof(struct sit_net), | |
1206 | }; | |
1207 | ||
1208 | static void __exit sit_cleanup(void) | |
1209 | { | |
1210 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); | |
1211 | ||
1212 | unregister_pernet_device(&sit_net_ops); | |
1213 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ | |
1214 | } | |
1215 | ||
1216 | static int __init sit_init(void) | |
1217 | { | |
1218 | int err; | |
1219 | ||
1220 | printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n"); | |
1221 | ||
1222 | err = register_pernet_device(&sit_net_ops); | |
1223 | if (err < 0) | |
1224 | return err; | |
1225 | err = xfrm4_tunnel_register(&sit_handler, AF_INET6); | |
1226 | if (err < 0) { | |
1227 | unregister_pernet_device(&sit_net_ops); | |
1228 | printk(KERN_INFO "sit init: Can't add protocol\n"); | |
1229 | } | |
1230 | return err; | |
1231 | } | |
1232 | ||
1233 | module_init(sit_init); | |
1234 | module_exit(sit_cleanup); | |
1235 | MODULE_LICENSE("GPL"); | |
1236 | MODULE_ALIAS("sit0"); |