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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 int ipip6_tunnel_init(struct net_device *dev); | |
67 | static void ipip6_tunnel_setup(struct net_device *dev); | |
68 | static void ipip6_dev_free(struct net_device *dev); | |
69 | ||
70 | static int sit_net_id __read_mostly; | |
71 | struct sit_net { | |
72 | struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE]; | |
73 | struct ip_tunnel __rcu *tunnels_r[HASH_SIZE]; | |
74 | struct ip_tunnel __rcu *tunnels_l[HASH_SIZE]; | |
75 | struct ip_tunnel __rcu *tunnels_wc[1]; | |
76 | struct ip_tunnel __rcu **tunnels[4]; | |
77 | ||
78 | struct net_device *fb_tunnel_dev; | |
79 | }; | |
80 | ||
81 | /* | |
82 | * Locking : hash tables are protected by RCU and RTNL | |
83 | */ | |
84 | ||
85 | #define for_each_ip_tunnel_rcu(start) \ | |
86 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) | |
87 | ||
88 | /* often modified stats are per cpu, other are shared (netdev->stats) */ | |
89 | struct pcpu_tstats { | |
90 | unsigned long rx_packets; | |
91 | unsigned long rx_bytes; | |
92 | unsigned long tx_packets; | |
93 | unsigned long tx_bytes; | |
94 | }; | |
95 | ||
96 | static struct net_device_stats *ipip6_get_stats(struct net_device *dev) | |
97 | { | |
98 | struct pcpu_tstats sum = { 0 }; | |
99 | int i; | |
100 | ||
101 | for_each_possible_cpu(i) { | |
102 | const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i); | |
103 | ||
104 | sum.rx_packets += tstats->rx_packets; | |
105 | sum.rx_bytes += tstats->rx_bytes; | |
106 | sum.tx_packets += tstats->tx_packets; | |
107 | sum.tx_bytes += tstats->tx_bytes; | |
108 | } | |
109 | dev->stats.rx_packets = sum.rx_packets; | |
110 | dev->stats.rx_bytes = sum.rx_bytes; | |
111 | dev->stats.tx_packets = sum.tx_packets; | |
112 | dev->stats.tx_bytes = sum.tx_bytes; | |
113 | return &dev->stats; | |
114 | } | |
115 | /* | |
116 | * Must be invoked with rcu_read_lock | |
117 | */ | |
118 | static struct ip_tunnel * ipip6_tunnel_lookup(struct net *net, | |
119 | struct net_device *dev, __be32 remote, __be32 local) | |
120 | { | |
121 | unsigned int h0 = HASH(remote); | |
122 | unsigned int h1 = HASH(local); | |
123 | struct ip_tunnel *t; | |
124 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
125 | ||
126 | for_each_ip_tunnel_rcu(sitn->tunnels_r_l[h0 ^ h1]) { | |
127 | if (local == t->parms.iph.saddr && | |
128 | remote == t->parms.iph.daddr && | |
129 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
130 | (t->dev->flags & IFF_UP)) | |
131 | return t; | |
132 | } | |
133 | for_each_ip_tunnel_rcu(sitn->tunnels_r[h0]) { | |
134 | if (remote == t->parms.iph.daddr && | |
135 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
136 | (t->dev->flags & IFF_UP)) | |
137 | return t; | |
138 | } | |
139 | for_each_ip_tunnel_rcu(sitn->tunnels_l[h1]) { | |
140 | if (local == t->parms.iph.saddr && | |
141 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
142 | (t->dev->flags & IFF_UP)) | |
143 | return t; | |
144 | } | |
145 | t = rcu_dereference(sitn->tunnels_wc[0]); | |
146 | if ((t != NULL) && (t->dev->flags & IFF_UP)) | |
147 | return t; | |
148 | return NULL; | |
149 | } | |
150 | ||
151 | static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn, | |
152 | struct ip_tunnel_parm *parms) | |
153 | { | |
154 | __be32 remote = parms->iph.daddr; | |
155 | __be32 local = parms->iph.saddr; | |
156 | unsigned int h = 0; | |
157 | int prio = 0; | |
158 | ||
159 | if (remote) { | |
160 | prio |= 2; | |
161 | h ^= HASH(remote); | |
162 | } | |
163 | if (local) { | |
164 | prio |= 1; | |
165 | h ^= HASH(local); | |
166 | } | |
167 | return &sitn->tunnels[prio][h]; | |
168 | } | |
169 | ||
170 | static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn, | |
171 | struct ip_tunnel *t) | |
172 | { | |
173 | return __ipip6_bucket(sitn, &t->parms); | |
174 | } | |
175 | ||
176 | static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t) | |
177 | { | |
178 | struct ip_tunnel __rcu **tp; | |
179 | struct ip_tunnel *iter; | |
180 | ||
181 | for (tp = ipip6_bucket(sitn, t); | |
182 | (iter = rtnl_dereference(*tp)) != NULL; | |
183 | tp = &iter->next) { | |
184 | if (t == iter) { | |
185 | rcu_assign_pointer(*tp, t->next); | |
186 | break; | |
187 | } | |
188 | } | |
189 | } | |
190 | ||
191 | static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t) | |
192 | { | |
193 | struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t); | |
194 | ||
195 | rcu_assign_pointer(t->next, rtnl_dereference(*tp)); | |
196 | rcu_assign_pointer(*tp, t); | |
197 | } | |
198 | ||
199 | static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn) | |
200 | { | |
201 | #ifdef CONFIG_IPV6_SIT_6RD | |
202 | struct ip_tunnel *t = netdev_priv(dev); | |
203 | ||
204 | if (t->dev == sitn->fb_tunnel_dev) { | |
205 | ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0); | |
206 | t->ip6rd.relay_prefix = 0; | |
207 | t->ip6rd.prefixlen = 16; | |
208 | t->ip6rd.relay_prefixlen = 0; | |
209 | } else { | |
210 | struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev); | |
211 | memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd)); | |
212 | } | |
213 | #endif | |
214 | } | |
215 | ||
216 | static struct ip_tunnel *ipip6_tunnel_locate(struct net *net, | |
217 | struct ip_tunnel_parm *parms, int create) | |
218 | { | |
219 | __be32 remote = parms->iph.daddr; | |
220 | __be32 local = parms->iph.saddr; | |
221 | struct ip_tunnel *t, *nt; | |
222 | struct ip_tunnel __rcu **tp; | |
223 | struct net_device *dev; | |
224 | char name[IFNAMSIZ]; | |
225 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
226 | ||
227 | for (tp = __ipip6_bucket(sitn, parms); | |
228 | (t = rtnl_dereference(*tp)) != NULL; | |
229 | tp = &t->next) { | |
230 | if (local == t->parms.iph.saddr && | |
231 | remote == t->parms.iph.daddr && | |
232 | parms->link == t->parms.link) { | |
233 | if (create) | |
234 | return NULL; | |
235 | else | |
236 | return t; | |
237 | } | |
238 | } | |
239 | if (!create) | |
240 | goto failed; | |
241 | ||
242 | if (parms->name[0]) | |
243 | strlcpy(name, parms->name, IFNAMSIZ); | |
244 | else | |
245 | strcpy(name, "sit%d"); | |
246 | ||
247 | dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup); | |
248 | if (dev == NULL) | |
249 | return NULL; | |
250 | ||
251 | dev_net_set(dev, net); | |
252 | ||
253 | if (strchr(name, '%')) { | |
254 | if (dev_alloc_name(dev, name) < 0) | |
255 | goto failed_free; | |
256 | } | |
257 | ||
258 | nt = netdev_priv(dev); | |
259 | ||
260 | nt->parms = *parms; | |
261 | if (ipip6_tunnel_init(dev) < 0) | |
262 | goto failed_free; | |
263 | ipip6_tunnel_clone_6rd(dev, sitn); | |
264 | ||
265 | if (parms->i_flags & SIT_ISATAP) | |
266 | dev->priv_flags |= IFF_ISATAP; | |
267 | ||
268 | if (register_netdevice(dev) < 0) | |
269 | goto failed_free; | |
270 | ||
271 | dev_hold(dev); | |
272 | ||
273 | ipip6_tunnel_link(sitn, nt); | |
274 | return nt; | |
275 | ||
276 | failed_free: | |
277 | ipip6_dev_free(dev); | |
278 | failed: | |
279 | return NULL; | |
280 | } | |
281 | ||
282 | #define for_each_prl_rcu(start) \ | |
283 | for (prl = rcu_dereference(start); \ | |
284 | prl; \ | |
285 | prl = rcu_dereference(prl->next)) | |
286 | ||
287 | static struct ip_tunnel_prl_entry * | |
288 | __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) | |
289 | { | |
290 | struct ip_tunnel_prl_entry *prl; | |
291 | ||
292 | for_each_prl_rcu(t->prl) | |
293 | if (prl->addr == addr) | |
294 | break; | |
295 | return prl; | |
296 | ||
297 | } | |
298 | ||
299 | static int ipip6_tunnel_get_prl(struct ip_tunnel *t, | |
300 | struct ip_tunnel_prl __user *a) | |
301 | { | |
302 | struct ip_tunnel_prl kprl, *kp; | |
303 | struct ip_tunnel_prl_entry *prl; | |
304 | unsigned int cmax, c = 0, ca, len; | |
305 | int ret = 0; | |
306 | ||
307 | if (copy_from_user(&kprl, a, sizeof(kprl))) | |
308 | return -EFAULT; | |
309 | cmax = kprl.datalen / sizeof(kprl); | |
310 | if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) | |
311 | cmax = 1; | |
312 | ||
313 | /* For simple GET or for root users, | |
314 | * we try harder to allocate. | |
315 | */ | |
316 | kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? | |
317 | kcalloc(cmax, sizeof(*kp), GFP_KERNEL) : | |
318 | NULL; | |
319 | ||
320 | rcu_read_lock(); | |
321 | ||
322 | ca = t->prl_count < cmax ? t->prl_count : cmax; | |
323 | ||
324 | if (!kp) { | |
325 | /* We don't try hard to allocate much memory for | |
326 | * non-root users. | |
327 | * For root users, retry allocating enough memory for | |
328 | * the answer. | |
329 | */ | |
330 | kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC); | |
331 | if (!kp) { | |
332 | ret = -ENOMEM; | |
333 | goto out; | |
334 | } | |
335 | } | |
336 | ||
337 | c = 0; | |
338 | for_each_prl_rcu(t->prl) { | |
339 | if (c >= cmax) | |
340 | break; | |
341 | if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) | |
342 | continue; | |
343 | kp[c].addr = prl->addr; | |
344 | kp[c].flags = prl->flags; | |
345 | c++; | |
346 | if (kprl.addr != htonl(INADDR_ANY)) | |
347 | break; | |
348 | } | |
349 | out: | |
350 | rcu_read_unlock(); | |
351 | ||
352 | len = sizeof(*kp) * c; | |
353 | ret = 0; | |
354 | if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) | |
355 | ret = -EFAULT; | |
356 | ||
357 | kfree(kp); | |
358 | ||
359 | return ret; | |
360 | } | |
361 | ||
362 | static int | |
363 | ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) | |
364 | { | |
365 | struct ip_tunnel_prl_entry *p; | |
366 | int err = 0; | |
367 | ||
368 | if (a->addr == htonl(INADDR_ANY)) | |
369 | return -EINVAL; | |
370 | ||
371 | ASSERT_RTNL(); | |
372 | ||
373 | for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) { | |
374 | if (p->addr == a->addr) { | |
375 | if (chg) { | |
376 | p->flags = a->flags; | |
377 | goto out; | |
378 | } | |
379 | err = -EEXIST; | |
380 | goto out; | |
381 | } | |
382 | } | |
383 | ||
384 | if (chg) { | |
385 | err = -ENXIO; | |
386 | goto out; | |
387 | } | |
388 | ||
389 | p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); | |
390 | if (!p) { | |
391 | err = -ENOBUFS; | |
392 | goto out; | |
393 | } | |
394 | ||
395 | p->next = t->prl; | |
396 | p->addr = a->addr; | |
397 | p->flags = a->flags; | |
398 | t->prl_count++; | |
399 | rcu_assign_pointer(t->prl, p); | |
400 | out: | |
401 | return err; | |
402 | } | |
403 | ||
404 | static void prl_entry_destroy_rcu(struct rcu_head *head) | |
405 | { | |
406 | kfree(container_of(head, struct ip_tunnel_prl_entry, rcu_head)); | |
407 | } | |
408 | ||
409 | static void prl_list_destroy_rcu(struct rcu_head *head) | |
410 | { | |
411 | struct ip_tunnel_prl_entry *p, *n; | |
412 | ||
413 | p = container_of(head, struct ip_tunnel_prl_entry, rcu_head); | |
414 | do { | |
415 | n = p->next; | |
416 | kfree(p); | |
417 | p = n; | |
418 | } while (p); | |
419 | } | |
420 | ||
421 | static int | |
422 | ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) | |
423 | { | |
424 | struct ip_tunnel_prl_entry *x, **p; | |
425 | int err = 0; | |
426 | ||
427 | ASSERT_RTNL(); | |
428 | ||
429 | if (a && a->addr != htonl(INADDR_ANY)) { | |
430 | for (p = &t->prl; *p; p = &(*p)->next) { | |
431 | if ((*p)->addr == a->addr) { | |
432 | x = *p; | |
433 | *p = x->next; | |
434 | call_rcu(&x->rcu_head, prl_entry_destroy_rcu); | |
435 | t->prl_count--; | |
436 | goto out; | |
437 | } | |
438 | } | |
439 | err = -ENXIO; | |
440 | } else { | |
441 | if (t->prl) { | |
442 | t->prl_count = 0; | |
443 | x = t->prl; | |
444 | call_rcu(&x->rcu_head, prl_list_destroy_rcu); | |
445 | t->prl = NULL; | |
446 | } | |
447 | } | |
448 | out: | |
449 | return err; | |
450 | } | |
451 | ||
452 | static int | |
453 | isatap_chksrc(struct sk_buff *skb, struct iphdr *iph, struct ip_tunnel *t) | |
454 | { | |
455 | struct ip_tunnel_prl_entry *p; | |
456 | int ok = 1; | |
457 | ||
458 | rcu_read_lock(); | |
459 | p = __ipip6_tunnel_locate_prl(t, iph->saddr); | |
460 | if (p) { | |
461 | if (p->flags & PRL_DEFAULT) | |
462 | skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; | |
463 | else | |
464 | skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; | |
465 | } else { | |
466 | struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; | |
467 | if (ipv6_addr_is_isatap(addr6) && | |
468 | (addr6->s6_addr32[3] == iph->saddr) && | |
469 | ipv6_chk_prefix(addr6, t->dev)) | |
470 | skb->ndisc_nodetype = NDISC_NODETYPE_HOST; | |
471 | else | |
472 | ok = 0; | |
473 | } | |
474 | rcu_read_unlock(); | |
475 | return ok; | |
476 | } | |
477 | ||
478 | static void ipip6_tunnel_uninit(struct net_device *dev) | |
479 | { | |
480 | struct net *net = dev_net(dev); | |
481 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
482 | ||
483 | if (dev == sitn->fb_tunnel_dev) { | |
484 | rcu_assign_pointer(sitn->tunnels_wc[0], NULL); | |
485 | } else { | |
486 | ipip6_tunnel_unlink(sitn, netdev_priv(dev)); | |
487 | ipip6_tunnel_del_prl(netdev_priv(dev), NULL); | |
488 | } | |
489 | dev_put(dev); | |
490 | } | |
491 | ||
492 | ||
493 | static int ipip6_err(struct sk_buff *skb, u32 info) | |
494 | { | |
495 | ||
496 | /* All the routers (except for Linux) return only | |
497 | 8 bytes of packet payload. It means, that precise relaying of | |
498 | ICMP in the real Internet is absolutely infeasible. | |
499 | */ | |
500 | struct iphdr *iph = (struct iphdr*)skb->data; | |
501 | const int type = icmp_hdr(skb)->type; | |
502 | const int code = icmp_hdr(skb)->code; | |
503 | struct ip_tunnel *t; | |
504 | int err; | |
505 | ||
506 | switch (type) { | |
507 | default: | |
508 | case ICMP_PARAMETERPROB: | |
509 | return 0; | |
510 | ||
511 | case ICMP_DEST_UNREACH: | |
512 | switch (code) { | |
513 | case ICMP_SR_FAILED: | |
514 | case ICMP_PORT_UNREACH: | |
515 | /* Impossible event. */ | |
516 | return 0; | |
517 | case ICMP_FRAG_NEEDED: | |
518 | /* Soft state for pmtu is maintained by IP core. */ | |
519 | return 0; | |
520 | default: | |
521 | /* All others are translated to HOST_UNREACH. | |
522 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
523 | I believe they are just ether pollution. --ANK | |
524 | */ | |
525 | break; | |
526 | } | |
527 | break; | |
528 | case ICMP_TIME_EXCEEDED: | |
529 | if (code != ICMP_EXC_TTL) | |
530 | return 0; | |
531 | break; | |
532 | } | |
533 | ||
534 | err = -ENOENT; | |
535 | ||
536 | rcu_read_lock(); | |
537 | t = ipip6_tunnel_lookup(dev_net(skb->dev), | |
538 | skb->dev, | |
539 | iph->daddr, | |
540 | iph->saddr); | |
541 | if (t == NULL || t->parms.iph.daddr == 0) | |
542 | goto out; | |
543 | ||
544 | err = 0; | |
545 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) | |
546 | goto out; | |
547 | ||
548 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) | |
549 | t->err_count++; | |
550 | else | |
551 | t->err_count = 1; | |
552 | t->err_time = jiffies; | |
553 | out: | |
554 | rcu_read_unlock(); | |
555 | return err; | |
556 | } | |
557 | ||
558 | static inline void ipip6_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb) | |
559 | { | |
560 | if (INET_ECN_is_ce(iph->tos)) | |
561 | IP6_ECN_set_ce(ipv6_hdr(skb)); | |
562 | } | |
563 | ||
564 | static int ipip6_rcv(struct sk_buff *skb) | |
565 | { | |
566 | struct iphdr *iph; | |
567 | struct ip_tunnel *tunnel; | |
568 | ||
569 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
570 | goto out; | |
571 | ||
572 | iph = ip_hdr(skb); | |
573 | ||
574 | rcu_read_lock(); | |
575 | tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, | |
576 | iph->saddr, iph->daddr); | |
577 | if (tunnel != NULL) { | |
578 | struct pcpu_tstats *tstats; | |
579 | ||
580 | secpath_reset(skb); | |
581 | skb->mac_header = skb->network_header; | |
582 | skb_reset_network_header(skb); | |
583 | IPCB(skb)->flags = 0; | |
584 | skb->protocol = htons(ETH_P_IPV6); | |
585 | skb->pkt_type = PACKET_HOST; | |
586 | ||
587 | if ((tunnel->dev->priv_flags & IFF_ISATAP) && | |
588 | !isatap_chksrc(skb, iph, tunnel)) { | |
589 | tunnel->dev->stats.rx_errors++; | |
590 | rcu_read_unlock(); | |
591 | kfree_skb(skb); | |
592 | return 0; | |
593 | } | |
594 | ||
595 | tstats = this_cpu_ptr(tunnel->dev->tstats); | |
596 | tstats->rx_packets++; | |
597 | tstats->rx_bytes += skb->len; | |
598 | ||
599 | __skb_tunnel_rx(skb, tunnel->dev); | |
600 | ||
601 | ipip6_ecn_decapsulate(iph, skb); | |
602 | ||
603 | netif_rx(skb); | |
604 | ||
605 | rcu_read_unlock(); | |
606 | return 0; | |
607 | } | |
608 | ||
609 | /* no tunnel matched, let upstream know, ipsec may handle it */ | |
610 | rcu_read_unlock(); | |
611 | return 1; | |
612 | out: | |
613 | kfree_skb(skb); | |
614 | return 0; | |
615 | } | |
616 | ||
617 | /* | |
618 | * Returns the embedded IPv4 address if the IPv6 address | |
619 | * comes from 6rd / 6to4 (RFC 3056) addr space. | |
620 | */ | |
621 | static inline | |
622 | __be32 try_6rd(struct in6_addr *v6dst, struct ip_tunnel *tunnel) | |
623 | { | |
624 | __be32 dst = 0; | |
625 | ||
626 | #ifdef CONFIG_IPV6_SIT_6RD | |
627 | if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, | |
628 | tunnel->ip6rd.prefixlen)) { | |
629 | unsigned int pbw0, pbi0; | |
630 | int pbi1; | |
631 | u32 d; | |
632 | ||
633 | pbw0 = tunnel->ip6rd.prefixlen >> 5; | |
634 | pbi0 = tunnel->ip6rd.prefixlen & 0x1f; | |
635 | ||
636 | d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> | |
637 | tunnel->ip6rd.relay_prefixlen; | |
638 | ||
639 | pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; | |
640 | if (pbi1 > 0) | |
641 | d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> | |
642 | (32 - pbi1); | |
643 | ||
644 | dst = tunnel->ip6rd.relay_prefix | htonl(d); | |
645 | } | |
646 | #else | |
647 | if (v6dst->s6_addr16[0] == htons(0x2002)) { | |
648 | /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ | |
649 | memcpy(&dst, &v6dst->s6_addr16[1], 4); | |
650 | } | |
651 | #endif | |
652 | return dst; | |
653 | } | |
654 | ||
655 | /* | |
656 | * This function assumes it is being called from dev_queue_xmit() | |
657 | * and that skb is filled properly by that function. | |
658 | */ | |
659 | ||
660 | static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, | |
661 | struct net_device *dev) | |
662 | { | |
663 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
664 | struct pcpu_tstats *tstats; | |
665 | struct iphdr *tiph = &tunnel->parms.iph; | |
666 | struct ipv6hdr *iph6 = ipv6_hdr(skb); | |
667 | u8 tos = tunnel->parms.iph.tos; | |
668 | __be16 df = tiph->frag_off; | |
669 | struct rtable *rt; /* Route to the other host */ | |
670 | struct net_device *tdev; /* Device to other host */ | |
671 | struct iphdr *iph; /* Our new IP header */ | |
672 | unsigned int max_headroom; /* The extra header space needed */ | |
673 | __be32 dst = tiph->daddr; | |
674 | int mtu; | |
675 | struct in6_addr *addr6; | |
676 | int addr_type; | |
677 | ||
678 | if (skb->protocol != htons(ETH_P_IPV6)) | |
679 | goto tx_error; | |
680 | ||
681 | /* ISATAP (RFC4214) - must come before 6to4 */ | |
682 | if (dev->priv_flags & IFF_ISATAP) { | |
683 | struct neighbour *neigh = NULL; | |
684 | ||
685 | if (skb_dst(skb)) | |
686 | neigh = skb_dst(skb)->neighbour; | |
687 | ||
688 | if (neigh == NULL) { | |
689 | if (net_ratelimit()) | |
690 | printk(KERN_DEBUG "sit: nexthop == NULL\n"); | |
691 | goto tx_error; | |
692 | } | |
693 | ||
694 | addr6 = (struct in6_addr*)&neigh->primary_key; | |
695 | addr_type = ipv6_addr_type(addr6); | |
696 | ||
697 | if ((addr_type & IPV6_ADDR_UNICAST) && | |
698 | ipv6_addr_is_isatap(addr6)) | |
699 | dst = addr6->s6_addr32[3]; | |
700 | else | |
701 | goto tx_error; | |
702 | } | |
703 | ||
704 | if (!dst) | |
705 | dst = try_6rd(&iph6->daddr, tunnel); | |
706 | ||
707 | if (!dst) { | |
708 | struct neighbour *neigh = NULL; | |
709 | ||
710 | if (skb_dst(skb)) | |
711 | neigh = skb_dst(skb)->neighbour; | |
712 | ||
713 | if (neigh == NULL) { | |
714 | if (net_ratelimit()) | |
715 | printk(KERN_DEBUG "sit: nexthop == NULL\n"); | |
716 | goto tx_error; | |
717 | } | |
718 | ||
719 | addr6 = (struct in6_addr*)&neigh->primary_key; | |
720 | addr_type = ipv6_addr_type(addr6); | |
721 | ||
722 | if (addr_type == IPV6_ADDR_ANY) { | |
723 | addr6 = &ipv6_hdr(skb)->daddr; | |
724 | addr_type = ipv6_addr_type(addr6); | |
725 | } | |
726 | ||
727 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) | |
728 | goto tx_error_icmp; | |
729 | ||
730 | dst = addr6->s6_addr32[3]; | |
731 | } | |
732 | ||
733 | { | |
734 | struct flowi fl = { .fl4_dst = dst, | |
735 | .fl4_src = tiph->saddr, | |
736 | .fl4_tos = RT_TOS(tos), | |
737 | .oif = tunnel->parms.link, | |
738 | .proto = IPPROTO_IPV6 }; | |
739 | if (ip_route_output_key(dev_net(dev), &rt, &fl)) { | |
740 | dev->stats.tx_carrier_errors++; | |
741 | goto tx_error_icmp; | |
742 | } | |
743 | } | |
744 | if (rt->rt_type != RTN_UNICAST) { | |
745 | ip_rt_put(rt); | |
746 | dev->stats.tx_carrier_errors++; | |
747 | goto tx_error_icmp; | |
748 | } | |
749 | tdev = rt->dst.dev; | |
750 | ||
751 | if (tdev == dev) { | |
752 | ip_rt_put(rt); | |
753 | dev->stats.collisions++; | |
754 | goto tx_error; | |
755 | } | |
756 | ||
757 | if (df) { | |
758 | mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr); | |
759 | ||
760 | if (mtu < 68) { | |
761 | dev->stats.collisions++; | |
762 | ip_rt_put(rt); | |
763 | goto tx_error; | |
764 | } | |
765 | ||
766 | if (mtu < IPV6_MIN_MTU) { | |
767 | mtu = IPV6_MIN_MTU; | |
768 | df = 0; | |
769 | } | |
770 | ||
771 | if (tunnel->parms.iph.daddr && skb_dst(skb)) | |
772 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); | |
773 | ||
774 | if (skb->len > mtu) { | |
775 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); | |
776 | ip_rt_put(rt); | |
777 | goto tx_error; | |
778 | } | |
779 | } | |
780 | ||
781 | if (tunnel->err_count > 0) { | |
782 | if (time_before(jiffies, | |
783 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
784 | tunnel->err_count--; | |
785 | dst_link_failure(skb); | |
786 | } else | |
787 | tunnel->err_count = 0; | |
788 | } | |
789 | ||
790 | /* | |
791 | * Okay, now see if we can stuff it in the buffer as-is. | |
792 | */ | |
793 | max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr); | |
794 | ||
795 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || | |
796 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
797 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); | |
798 | if (!new_skb) { | |
799 | ip_rt_put(rt); | |
800 | dev->stats.tx_dropped++; | |
801 | dev_kfree_skb(skb); | |
802 | return NETDEV_TX_OK; | |
803 | } | |
804 | if (skb->sk) | |
805 | skb_set_owner_w(new_skb, skb->sk); | |
806 | dev_kfree_skb(skb); | |
807 | skb = new_skb; | |
808 | iph6 = ipv6_hdr(skb); | |
809 | } | |
810 | ||
811 | skb->transport_header = skb->network_header; | |
812 | skb_push(skb, sizeof(struct iphdr)); | |
813 | skb_reset_network_header(skb); | |
814 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); | |
815 | IPCB(skb)->flags = 0; | |
816 | skb_dst_drop(skb); | |
817 | skb_dst_set(skb, &rt->dst); | |
818 | ||
819 | /* | |
820 | * Push down and install the IPIP header. | |
821 | */ | |
822 | ||
823 | iph = ip_hdr(skb); | |
824 | iph->version = 4; | |
825 | iph->ihl = sizeof(struct iphdr)>>2; | |
826 | iph->frag_off = df; | |
827 | iph->protocol = IPPROTO_IPV6; | |
828 | iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); | |
829 | iph->daddr = rt->rt_dst; | |
830 | iph->saddr = rt->rt_src; | |
831 | ||
832 | if ((iph->ttl = tiph->ttl) == 0) | |
833 | iph->ttl = iph6->hop_limit; | |
834 | ||
835 | nf_reset(skb); | |
836 | tstats = this_cpu_ptr(dev->tstats); | |
837 | __IPTUNNEL_XMIT(tstats, &dev->stats); | |
838 | return NETDEV_TX_OK; | |
839 | ||
840 | tx_error_icmp: | |
841 | dst_link_failure(skb); | |
842 | tx_error: | |
843 | dev->stats.tx_errors++; | |
844 | dev_kfree_skb(skb); | |
845 | return NETDEV_TX_OK; | |
846 | } | |
847 | ||
848 | static void ipip6_tunnel_bind_dev(struct net_device *dev) | |
849 | { | |
850 | struct net_device *tdev = NULL; | |
851 | struct ip_tunnel *tunnel; | |
852 | struct iphdr *iph; | |
853 | ||
854 | tunnel = netdev_priv(dev); | |
855 | iph = &tunnel->parms.iph; | |
856 | ||
857 | if (iph->daddr) { | |
858 | struct flowi fl = { .fl4_dst = iph->daddr, | |
859 | .fl4_src = iph->saddr, | |
860 | .fl4_tos = RT_TOS(iph->tos), | |
861 | .oif = tunnel->parms.link, | |
862 | .proto = IPPROTO_IPV6 }; | |
863 | struct rtable *rt; | |
864 | if (!ip_route_output_key(dev_net(dev), &rt, &fl)) { | |
865 | tdev = rt->dst.dev; | |
866 | ip_rt_put(rt); | |
867 | } | |
868 | dev->flags |= IFF_POINTOPOINT; | |
869 | } | |
870 | ||
871 | if (!tdev && tunnel->parms.link) | |
872 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); | |
873 | ||
874 | if (tdev) { | |
875 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); | |
876 | dev->mtu = tdev->mtu - sizeof(struct iphdr); | |
877 | if (dev->mtu < IPV6_MIN_MTU) | |
878 | dev->mtu = IPV6_MIN_MTU; | |
879 | } | |
880 | dev->iflink = tunnel->parms.link; | |
881 | } | |
882 | ||
883 | static int | |
884 | ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
885 | { | |
886 | int err = 0; | |
887 | struct ip_tunnel_parm p; | |
888 | struct ip_tunnel_prl prl; | |
889 | struct ip_tunnel *t; | |
890 | struct net *net = dev_net(dev); | |
891 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
892 | #ifdef CONFIG_IPV6_SIT_6RD | |
893 | struct ip_tunnel_6rd ip6rd; | |
894 | #endif | |
895 | ||
896 | switch (cmd) { | |
897 | case SIOCGETTUNNEL: | |
898 | #ifdef CONFIG_IPV6_SIT_6RD | |
899 | case SIOCGET6RD: | |
900 | #endif | |
901 | t = NULL; | |
902 | if (dev == sitn->fb_tunnel_dev) { | |
903 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { | |
904 | err = -EFAULT; | |
905 | break; | |
906 | } | |
907 | t = ipip6_tunnel_locate(net, &p, 0); | |
908 | } | |
909 | if (t == NULL) | |
910 | t = netdev_priv(dev); | |
911 | ||
912 | err = -EFAULT; | |
913 | if (cmd == SIOCGETTUNNEL) { | |
914 | memcpy(&p, &t->parms, sizeof(p)); | |
915 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, | |
916 | sizeof(p))) | |
917 | goto done; | |
918 | #ifdef CONFIG_IPV6_SIT_6RD | |
919 | } else { | |
920 | ipv6_addr_copy(&ip6rd.prefix, &t->ip6rd.prefix); | |
921 | ip6rd.relay_prefix = t->ip6rd.relay_prefix; | |
922 | ip6rd.prefixlen = t->ip6rd.prefixlen; | |
923 | ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; | |
924 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd, | |
925 | sizeof(ip6rd))) | |
926 | goto done; | |
927 | #endif | |
928 | } | |
929 | err = 0; | |
930 | break; | |
931 | ||
932 | case SIOCADDTUNNEL: | |
933 | case SIOCCHGTUNNEL: | |
934 | err = -EPERM; | |
935 | if (!capable(CAP_NET_ADMIN)) | |
936 | goto done; | |
937 | ||
938 | err = -EFAULT; | |
939 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
940 | goto done; | |
941 | ||
942 | err = -EINVAL; | |
943 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 || | |
944 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) | |
945 | goto done; | |
946 | if (p.iph.ttl) | |
947 | p.iph.frag_off |= htons(IP_DF); | |
948 | ||
949 | t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); | |
950 | ||
951 | if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { | |
952 | if (t != NULL) { | |
953 | if (t->dev != dev) { | |
954 | err = -EEXIST; | |
955 | break; | |
956 | } | |
957 | } else { | |
958 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || | |
959 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { | |
960 | err = -EINVAL; | |
961 | break; | |
962 | } | |
963 | t = netdev_priv(dev); | |
964 | ipip6_tunnel_unlink(sitn, t); | |
965 | synchronize_net(); | |
966 | t->parms.iph.saddr = p.iph.saddr; | |
967 | t->parms.iph.daddr = p.iph.daddr; | |
968 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
969 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
970 | ipip6_tunnel_link(sitn, t); | |
971 | netdev_state_change(dev); | |
972 | } | |
973 | } | |
974 | ||
975 | if (t) { | |
976 | err = 0; | |
977 | if (cmd == SIOCCHGTUNNEL) { | |
978 | t->parms.iph.ttl = p.iph.ttl; | |
979 | t->parms.iph.tos = p.iph.tos; | |
980 | if (t->parms.link != p.link) { | |
981 | t->parms.link = p.link; | |
982 | ipip6_tunnel_bind_dev(dev); | |
983 | netdev_state_change(dev); | |
984 | } | |
985 | } | |
986 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) | |
987 | err = -EFAULT; | |
988 | } else | |
989 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
990 | break; | |
991 | ||
992 | case SIOCDELTUNNEL: | |
993 | err = -EPERM; | |
994 | if (!capable(CAP_NET_ADMIN)) | |
995 | goto done; | |
996 | ||
997 | if (dev == sitn->fb_tunnel_dev) { | |
998 | err = -EFAULT; | |
999 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1000 | goto done; | |
1001 | err = -ENOENT; | |
1002 | if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL) | |
1003 | goto done; | |
1004 | err = -EPERM; | |
1005 | if (t == netdev_priv(sitn->fb_tunnel_dev)) | |
1006 | goto done; | |
1007 | dev = t->dev; | |
1008 | } | |
1009 | unregister_netdevice(dev); | |
1010 | err = 0; | |
1011 | break; | |
1012 | ||
1013 | case SIOCGETPRL: | |
1014 | err = -EINVAL; | |
1015 | if (dev == sitn->fb_tunnel_dev) | |
1016 | goto done; | |
1017 | err = -ENOENT; | |
1018 | if (!(t = netdev_priv(dev))) | |
1019 | goto done; | |
1020 | err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data); | |
1021 | break; | |
1022 | ||
1023 | case SIOCADDPRL: | |
1024 | case SIOCDELPRL: | |
1025 | case SIOCCHGPRL: | |
1026 | err = -EPERM; | |
1027 | if (!capable(CAP_NET_ADMIN)) | |
1028 | goto done; | |
1029 | err = -EINVAL; | |
1030 | if (dev == sitn->fb_tunnel_dev) | |
1031 | goto done; | |
1032 | err = -EFAULT; | |
1033 | if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) | |
1034 | goto done; | |
1035 | err = -ENOENT; | |
1036 | if (!(t = netdev_priv(dev))) | |
1037 | goto done; | |
1038 | ||
1039 | switch (cmd) { | |
1040 | case SIOCDELPRL: | |
1041 | err = ipip6_tunnel_del_prl(t, &prl); | |
1042 | break; | |
1043 | case SIOCADDPRL: | |
1044 | case SIOCCHGPRL: | |
1045 | err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); | |
1046 | break; | |
1047 | } | |
1048 | netdev_state_change(dev); | |
1049 | break; | |
1050 | ||
1051 | #ifdef CONFIG_IPV6_SIT_6RD | |
1052 | case SIOCADD6RD: | |
1053 | case SIOCCHG6RD: | |
1054 | case SIOCDEL6RD: | |
1055 | err = -EPERM; | |
1056 | if (!capable(CAP_NET_ADMIN)) | |
1057 | goto done; | |
1058 | ||
1059 | err = -EFAULT; | |
1060 | if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data, | |
1061 | sizeof(ip6rd))) | |
1062 | goto done; | |
1063 | ||
1064 | t = netdev_priv(dev); | |
1065 | ||
1066 | if (cmd != SIOCDEL6RD) { | |
1067 | struct in6_addr prefix; | |
1068 | __be32 relay_prefix; | |
1069 | ||
1070 | err = -EINVAL; | |
1071 | if (ip6rd.relay_prefixlen > 32 || | |
1072 | ip6rd.prefixlen + (32 - ip6rd.relay_prefixlen) > 64) | |
1073 | goto done; | |
1074 | ||
1075 | ipv6_addr_prefix(&prefix, &ip6rd.prefix, | |
1076 | ip6rd.prefixlen); | |
1077 | if (!ipv6_addr_equal(&prefix, &ip6rd.prefix)) | |
1078 | goto done; | |
1079 | if (ip6rd.relay_prefixlen) | |
1080 | relay_prefix = ip6rd.relay_prefix & | |
1081 | htonl(0xffffffffUL << | |
1082 | (32 - ip6rd.relay_prefixlen)); | |
1083 | else | |
1084 | relay_prefix = 0; | |
1085 | if (relay_prefix != ip6rd.relay_prefix) | |
1086 | goto done; | |
1087 | ||
1088 | ipv6_addr_copy(&t->ip6rd.prefix, &prefix); | |
1089 | t->ip6rd.relay_prefix = relay_prefix; | |
1090 | t->ip6rd.prefixlen = ip6rd.prefixlen; | |
1091 | t->ip6rd.relay_prefixlen = ip6rd.relay_prefixlen; | |
1092 | } else | |
1093 | ipip6_tunnel_clone_6rd(dev, sitn); | |
1094 | ||
1095 | err = 0; | |
1096 | break; | |
1097 | #endif | |
1098 | ||
1099 | default: | |
1100 | err = -EINVAL; | |
1101 | } | |
1102 | ||
1103 | done: | |
1104 | return err; | |
1105 | } | |
1106 | ||
1107 | static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu) | |
1108 | { | |
1109 | if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr)) | |
1110 | return -EINVAL; | |
1111 | dev->mtu = new_mtu; | |
1112 | return 0; | |
1113 | } | |
1114 | ||
1115 | static const struct net_device_ops ipip6_netdev_ops = { | |
1116 | .ndo_uninit = ipip6_tunnel_uninit, | |
1117 | .ndo_start_xmit = ipip6_tunnel_xmit, | |
1118 | .ndo_do_ioctl = ipip6_tunnel_ioctl, | |
1119 | .ndo_change_mtu = ipip6_tunnel_change_mtu, | |
1120 | .ndo_get_stats = ipip6_get_stats, | |
1121 | }; | |
1122 | ||
1123 | static void ipip6_dev_free(struct net_device *dev) | |
1124 | { | |
1125 | free_percpu(dev->tstats); | |
1126 | free_netdev(dev); | |
1127 | } | |
1128 | ||
1129 | static void ipip6_tunnel_setup(struct net_device *dev) | |
1130 | { | |
1131 | dev->netdev_ops = &ipip6_netdev_ops; | |
1132 | dev->destructor = ipip6_dev_free; | |
1133 | ||
1134 | dev->type = ARPHRD_SIT; | |
1135 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); | |
1136 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); | |
1137 | dev->flags = IFF_NOARP; | |
1138 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; | |
1139 | dev->iflink = 0; | |
1140 | dev->addr_len = 4; | |
1141 | dev->features |= NETIF_F_NETNS_LOCAL; | |
1142 | dev->features |= NETIF_F_LLTX; | |
1143 | } | |
1144 | ||
1145 | static int ipip6_tunnel_init(struct net_device *dev) | |
1146 | { | |
1147 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1148 | ||
1149 | tunnel->dev = dev; | |
1150 | strcpy(tunnel->parms.name, dev->name); | |
1151 | ||
1152 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
1153 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
1154 | ||
1155 | ipip6_tunnel_bind_dev(dev); | |
1156 | dev->tstats = alloc_percpu(struct pcpu_tstats); | |
1157 | if (!dev->tstats) | |
1158 | return -ENOMEM; | |
1159 | ||
1160 | return 0; | |
1161 | } | |
1162 | ||
1163 | static int __net_init ipip6_fb_tunnel_init(struct net_device *dev) | |
1164 | { | |
1165 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1166 | struct iphdr *iph = &tunnel->parms.iph; | |
1167 | struct net *net = dev_net(dev); | |
1168 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1169 | ||
1170 | tunnel->dev = dev; | |
1171 | strcpy(tunnel->parms.name, dev->name); | |
1172 | ||
1173 | iph->version = 4; | |
1174 | iph->protocol = IPPROTO_IPV6; | |
1175 | iph->ihl = 5; | |
1176 | iph->ttl = 64; | |
1177 | ||
1178 | dev->tstats = alloc_percpu(struct pcpu_tstats); | |
1179 | if (!dev->tstats) | |
1180 | return -ENOMEM; | |
1181 | dev_hold(dev); | |
1182 | sitn->tunnels_wc[0] = tunnel; | |
1183 | return 0; | |
1184 | } | |
1185 | ||
1186 | static struct xfrm_tunnel sit_handler __read_mostly = { | |
1187 | .handler = ipip6_rcv, | |
1188 | .err_handler = ipip6_err, | |
1189 | .priority = 1, | |
1190 | }; | |
1191 | ||
1192 | static void __net_exit sit_destroy_tunnels(struct sit_net *sitn, struct list_head *head) | |
1193 | { | |
1194 | int prio; | |
1195 | ||
1196 | for (prio = 1; prio < 4; prio++) { | |
1197 | int h; | |
1198 | for (h = 0; h < HASH_SIZE; h++) { | |
1199 | struct ip_tunnel *t = sitn->tunnels[prio][h]; | |
1200 | ||
1201 | while (t != NULL) { | |
1202 | unregister_netdevice_queue(t->dev, head); | |
1203 | t = t->next; | |
1204 | } | |
1205 | } | |
1206 | } | |
1207 | } | |
1208 | ||
1209 | static int __net_init sit_init_net(struct net *net) | |
1210 | { | |
1211 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1212 | int err; | |
1213 | ||
1214 | sitn->tunnels[0] = sitn->tunnels_wc; | |
1215 | sitn->tunnels[1] = sitn->tunnels_l; | |
1216 | sitn->tunnels[2] = sitn->tunnels_r; | |
1217 | sitn->tunnels[3] = sitn->tunnels_r_l; | |
1218 | ||
1219 | sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", | |
1220 | ipip6_tunnel_setup); | |
1221 | if (!sitn->fb_tunnel_dev) { | |
1222 | err = -ENOMEM; | |
1223 | goto err_alloc_dev; | |
1224 | } | |
1225 | dev_net_set(sitn->fb_tunnel_dev, net); | |
1226 | ||
1227 | err = ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); | |
1228 | if (err) | |
1229 | goto err_dev_free; | |
1230 | ||
1231 | ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); | |
1232 | ||
1233 | if ((err = register_netdev(sitn->fb_tunnel_dev))) | |
1234 | goto err_reg_dev; | |
1235 | ||
1236 | return 0; | |
1237 | ||
1238 | err_reg_dev: | |
1239 | dev_put(sitn->fb_tunnel_dev); | |
1240 | err_dev_free: | |
1241 | ipip6_dev_free(sitn->fb_tunnel_dev); | |
1242 | err_alloc_dev: | |
1243 | return err; | |
1244 | } | |
1245 | ||
1246 | static void __net_exit sit_exit_net(struct net *net) | |
1247 | { | |
1248 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1249 | LIST_HEAD(list); | |
1250 | ||
1251 | rtnl_lock(); | |
1252 | sit_destroy_tunnels(sitn, &list); | |
1253 | unregister_netdevice_queue(sitn->fb_tunnel_dev, &list); | |
1254 | unregister_netdevice_many(&list); | |
1255 | rtnl_unlock(); | |
1256 | } | |
1257 | ||
1258 | static struct pernet_operations sit_net_ops = { | |
1259 | .init = sit_init_net, | |
1260 | .exit = sit_exit_net, | |
1261 | .id = &sit_net_id, | |
1262 | .size = sizeof(struct sit_net), | |
1263 | }; | |
1264 | ||
1265 | static void __exit sit_cleanup(void) | |
1266 | { | |
1267 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); | |
1268 | ||
1269 | unregister_pernet_device(&sit_net_ops); | |
1270 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ | |
1271 | } | |
1272 | ||
1273 | static int __init sit_init(void) | |
1274 | { | |
1275 | int err; | |
1276 | ||
1277 | printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n"); | |
1278 | ||
1279 | err = register_pernet_device(&sit_net_ops); | |
1280 | if (err < 0) | |
1281 | return err; | |
1282 | err = xfrm4_tunnel_register(&sit_handler, AF_INET6); | |
1283 | if (err < 0) { | |
1284 | unregister_pernet_device(&sit_net_ops); | |
1285 | printk(KERN_INFO "sit init: Can't add protocol\n"); | |
1286 | } | |
1287 | return err; | |
1288 | } | |
1289 | ||
1290 | module_init(sit_init); | |
1291 | module_exit(sit_cleanup); | |
1292 | MODULE_LICENSE("GPL"); | |
1293 | MODULE_ALIAS("sit0"); |