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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/ipip.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 int ipip6_tunnel_init(struct net_device *dev); | |
69 | static void ipip6_tunnel_setup(struct net_device *dev); | |
70 | static void ipip6_dev_free(struct net_device *dev); | |
71 | ||
72 | static int sit_net_id __read_mostly; | |
73 | struct sit_net { | |
74 | struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE]; | |
75 | struct ip_tunnel __rcu *tunnels_r[HASH_SIZE]; | |
76 | struct ip_tunnel __rcu *tunnels_l[HASH_SIZE]; | |
77 | struct ip_tunnel __rcu *tunnels_wc[1]; | |
78 | struct ip_tunnel __rcu **tunnels[4]; | |
79 | ||
80 | struct net_device *fb_tunnel_dev; | |
81 | }; | |
82 | ||
83 | /* | |
84 | * Locking : hash tables are protected by RCU and RTNL | |
85 | */ | |
86 | ||
87 | #define for_each_ip_tunnel_rcu(start) \ | |
88 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) | |
89 | ||
90 | /* often modified stats are per cpu, other are shared (netdev->stats) */ | |
91 | struct pcpu_tstats { | |
92 | u64 rx_packets; | |
93 | u64 rx_bytes; | |
94 | u64 tx_packets; | |
95 | u64 tx_bytes; | |
96 | struct u64_stats_sync syncp; | |
97 | }; | |
98 | ||
99 | static struct rtnl_link_stats64 *ipip6_get_stats64(struct net_device *dev, | |
100 | struct rtnl_link_stats64 *tot) | |
101 | { | |
102 | int i; | |
103 | ||
104 | for_each_possible_cpu(i) { | |
105 | const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i); | |
106 | u64 rx_packets, rx_bytes, tx_packets, tx_bytes; | |
107 | unsigned int start; | |
108 | ||
109 | do { | |
110 | start = u64_stats_fetch_begin_bh(&tstats->syncp); | |
111 | rx_packets = tstats->rx_packets; | |
112 | tx_packets = tstats->tx_packets; | |
113 | rx_bytes = tstats->rx_bytes; | |
114 | tx_bytes = tstats->tx_bytes; | |
115 | } while (u64_stats_fetch_retry_bh(&tstats->syncp, start)); | |
116 | ||
117 | tot->rx_packets += rx_packets; | |
118 | tot->tx_packets += tx_packets; | |
119 | tot->rx_bytes += rx_bytes; | |
120 | tot->tx_bytes += tx_bytes; | |
121 | } | |
122 | ||
123 | tot->rx_errors = dev->stats.rx_errors; | |
124 | tot->tx_fifo_errors = dev->stats.tx_fifo_errors; | |
125 | tot->tx_carrier_errors = dev->stats.tx_carrier_errors; | |
126 | tot->tx_dropped = dev->stats.tx_dropped; | |
127 | tot->tx_aborted_errors = dev->stats.tx_aborted_errors; | |
128 | tot->tx_errors = dev->stats.tx_errors; | |
129 | ||
130 | return tot; | |
131 | } | |
132 | ||
133 | /* | |
134 | * Must be invoked with rcu_read_lock | |
135 | */ | |
136 | static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net, | |
137 | struct net_device *dev, __be32 remote, __be32 local) | |
138 | { | |
139 | unsigned int h0 = HASH(remote); | |
140 | unsigned int h1 = HASH(local); | |
141 | struct ip_tunnel *t; | |
142 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
143 | ||
144 | for_each_ip_tunnel_rcu(sitn->tunnels_r_l[h0 ^ h1]) { | |
145 | if (local == t->parms.iph.saddr && | |
146 | remote == t->parms.iph.daddr && | |
147 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
148 | (t->dev->flags & IFF_UP)) | |
149 | return t; | |
150 | } | |
151 | for_each_ip_tunnel_rcu(sitn->tunnels_r[h0]) { | |
152 | if (remote == t->parms.iph.daddr && | |
153 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
154 | (t->dev->flags & IFF_UP)) | |
155 | return t; | |
156 | } | |
157 | for_each_ip_tunnel_rcu(sitn->tunnels_l[h1]) { | |
158 | if (local == t->parms.iph.saddr && | |
159 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
160 | (t->dev->flags & IFF_UP)) | |
161 | return t; | |
162 | } | |
163 | t = rcu_dereference(sitn->tunnels_wc[0]); | |
164 | if ((t != NULL) && (t->dev->flags & IFF_UP)) | |
165 | return t; | |
166 | return NULL; | |
167 | } | |
168 | ||
169 | static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn, | |
170 | struct ip_tunnel_parm *parms) | |
171 | { | |
172 | __be32 remote = parms->iph.daddr; | |
173 | __be32 local = parms->iph.saddr; | |
174 | unsigned int h = 0; | |
175 | int prio = 0; | |
176 | ||
177 | if (remote) { | |
178 | prio |= 2; | |
179 | h ^= HASH(remote); | |
180 | } | |
181 | if (local) { | |
182 | prio |= 1; | |
183 | h ^= HASH(local); | |
184 | } | |
185 | return &sitn->tunnels[prio][h]; | |
186 | } | |
187 | ||
188 | static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn, | |
189 | struct ip_tunnel *t) | |
190 | { | |
191 | return __ipip6_bucket(sitn, &t->parms); | |
192 | } | |
193 | ||
194 | static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t) | |
195 | { | |
196 | struct ip_tunnel __rcu **tp; | |
197 | struct ip_tunnel *iter; | |
198 | ||
199 | for (tp = ipip6_bucket(sitn, t); | |
200 | (iter = rtnl_dereference(*tp)) != NULL; | |
201 | tp = &iter->next) { | |
202 | if (t == iter) { | |
203 | rcu_assign_pointer(*tp, t->next); | |
204 | break; | |
205 | } | |
206 | } | |
207 | } | |
208 | ||
209 | static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t) | |
210 | { | |
211 | struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t); | |
212 | ||
213 | rcu_assign_pointer(t->next, rtnl_dereference(*tp)); | |
214 | rcu_assign_pointer(*tp, t); | |
215 | } | |
216 | ||
217 | static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn) | |
218 | { | |
219 | #ifdef CONFIG_IPV6_SIT_6RD | |
220 | struct ip_tunnel *t = netdev_priv(dev); | |
221 | ||
222 | if (t->dev == sitn->fb_tunnel_dev) { | |
223 | ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0); | |
224 | t->ip6rd.relay_prefix = 0; | |
225 | t->ip6rd.prefixlen = 16; | |
226 | t->ip6rd.relay_prefixlen = 0; | |
227 | } else { | |
228 | struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev); | |
229 | memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd)); | |
230 | } | |
231 | #endif | |
232 | } | |
233 | ||
234 | static struct ip_tunnel *ipip6_tunnel_locate(struct net *net, | |
235 | struct ip_tunnel_parm *parms, int create) | |
236 | { | |
237 | __be32 remote = parms->iph.daddr; | |
238 | __be32 local = parms->iph.saddr; | |
239 | struct ip_tunnel *t, *nt; | |
240 | struct ip_tunnel __rcu **tp; | |
241 | struct net_device *dev; | |
242 | char name[IFNAMSIZ]; | |
243 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
244 | ||
245 | for (tp = __ipip6_bucket(sitn, parms); | |
246 | (t = rtnl_dereference(*tp)) != NULL; | |
247 | tp = &t->next) { | |
248 | if (local == t->parms.iph.saddr && | |
249 | remote == t->parms.iph.daddr && | |
250 | parms->link == t->parms.link) { | |
251 | if (create) | |
252 | return NULL; | |
253 | else | |
254 | return t; | |
255 | } | |
256 | } | |
257 | if (!create) | |
258 | goto failed; | |
259 | ||
260 | if (parms->name[0]) | |
261 | strlcpy(name, parms->name, IFNAMSIZ); | |
262 | else | |
263 | strcpy(name, "sit%d"); | |
264 | ||
265 | dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup); | |
266 | if (dev == NULL) | |
267 | return NULL; | |
268 | ||
269 | dev_net_set(dev, net); | |
270 | ||
271 | nt = netdev_priv(dev); | |
272 | ||
273 | nt->parms = *parms; | |
274 | if (ipip6_tunnel_init(dev) < 0) | |
275 | goto failed_free; | |
276 | ipip6_tunnel_clone_6rd(dev, sitn); | |
277 | ||
278 | if (parms->i_flags & SIT_ISATAP) | |
279 | dev->priv_flags |= IFF_ISATAP; | |
280 | ||
281 | if (register_netdevice(dev) < 0) | |
282 | goto failed_free; | |
283 | ||
284 | strcpy(nt->parms.name, dev->name); | |
285 | ||
286 | dev_hold(dev); | |
287 | ||
288 | ipip6_tunnel_link(sitn, nt); | |
289 | return nt; | |
290 | ||
291 | failed_free: | |
292 | ipip6_dev_free(dev); | |
293 | failed: | |
294 | return NULL; | |
295 | } | |
296 | ||
297 | #define for_each_prl_rcu(start) \ | |
298 | for (prl = rcu_dereference(start); \ | |
299 | prl; \ | |
300 | prl = rcu_dereference(prl->next)) | |
301 | ||
302 | static struct ip_tunnel_prl_entry * | |
303 | __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) | |
304 | { | |
305 | struct ip_tunnel_prl_entry *prl; | |
306 | ||
307 | for_each_prl_rcu(t->prl) | |
308 | if (prl->addr == addr) | |
309 | break; | |
310 | return prl; | |
311 | ||
312 | } | |
313 | ||
314 | static int ipip6_tunnel_get_prl(struct ip_tunnel *t, | |
315 | struct ip_tunnel_prl __user *a) | |
316 | { | |
317 | struct ip_tunnel_prl kprl, *kp; | |
318 | struct ip_tunnel_prl_entry *prl; | |
319 | unsigned int cmax, c = 0, ca, len; | |
320 | int ret = 0; | |
321 | ||
322 | if (copy_from_user(&kprl, a, sizeof(kprl))) | |
323 | return -EFAULT; | |
324 | cmax = kprl.datalen / sizeof(kprl); | |
325 | if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) | |
326 | cmax = 1; | |
327 | ||
328 | /* For simple GET or for root users, | |
329 | * we try harder to allocate. | |
330 | */ | |
331 | kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? | |
332 | kcalloc(cmax, sizeof(*kp), GFP_KERNEL) : | |
333 | NULL; | |
334 | ||
335 | rcu_read_lock(); | |
336 | ||
337 | ca = t->prl_count < cmax ? t->prl_count : cmax; | |
338 | ||
339 | if (!kp) { | |
340 | /* We don't try hard to allocate much memory for | |
341 | * non-root users. | |
342 | * For root users, retry allocating enough memory for | |
343 | * the answer. | |
344 | */ | |
345 | kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC); | |
346 | if (!kp) { | |
347 | ret = -ENOMEM; | |
348 | goto out; | |
349 | } | |
350 | } | |
351 | ||
352 | c = 0; | |
353 | for_each_prl_rcu(t->prl) { | |
354 | if (c >= cmax) | |
355 | break; | |
356 | if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) | |
357 | continue; | |
358 | kp[c].addr = prl->addr; | |
359 | kp[c].flags = prl->flags; | |
360 | c++; | |
361 | if (kprl.addr != htonl(INADDR_ANY)) | |
362 | break; | |
363 | } | |
364 | out: | |
365 | rcu_read_unlock(); | |
366 | ||
367 | len = sizeof(*kp) * c; | |
368 | ret = 0; | |
369 | if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) | |
370 | ret = -EFAULT; | |
371 | ||
372 | kfree(kp); | |
373 | ||
374 | return ret; | |
375 | } | |
376 | ||
377 | static int | |
378 | ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) | |
379 | { | |
380 | struct ip_tunnel_prl_entry *p; | |
381 | int err = 0; | |
382 | ||
383 | if (a->addr == htonl(INADDR_ANY)) | |
384 | return -EINVAL; | |
385 | ||
386 | ASSERT_RTNL(); | |
387 | ||
388 | for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) { | |
389 | if (p->addr == a->addr) { | |
390 | if (chg) { | |
391 | p->flags = a->flags; | |
392 | goto out; | |
393 | } | |
394 | err = -EEXIST; | |
395 | goto out; | |
396 | } | |
397 | } | |
398 | ||
399 | if (chg) { | |
400 | err = -ENXIO; | |
401 | goto out; | |
402 | } | |
403 | ||
404 | p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); | |
405 | if (!p) { | |
406 | err = -ENOBUFS; | |
407 | goto out; | |
408 | } | |
409 | ||
410 | p->next = t->prl; | |
411 | p->addr = a->addr; | |
412 | p->flags = a->flags; | |
413 | t->prl_count++; | |
414 | rcu_assign_pointer(t->prl, p); | |
415 | out: | |
416 | return err; | |
417 | } | |
418 | ||
419 | static void prl_list_destroy_rcu(struct rcu_head *head) | |
420 | { | |
421 | struct ip_tunnel_prl_entry *p, *n; | |
422 | ||
423 | p = container_of(head, struct ip_tunnel_prl_entry, rcu_head); | |
424 | do { | |
425 | n = rcu_dereference_protected(p->next, 1); | |
426 | kfree(p); | |
427 | p = n; | |
428 | } while (p); | |
429 | } | |
430 | ||
431 | static int | |
432 | ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) | |
433 | { | |
434 | struct ip_tunnel_prl_entry *x; | |
435 | struct ip_tunnel_prl_entry __rcu **p; | |
436 | int err = 0; | |
437 | ||
438 | ASSERT_RTNL(); | |
439 | ||
440 | if (a && a->addr != htonl(INADDR_ANY)) { | |
441 | for (p = &t->prl; | |
442 | (x = rtnl_dereference(*p)) != NULL; | |
443 | p = &x->next) { | |
444 | if (x->addr == a->addr) { | |
445 | *p = x->next; | |
446 | kfree_rcu(x, rcu_head); | |
447 | t->prl_count--; | |
448 | goto out; | |
449 | } | |
450 | } | |
451 | err = -ENXIO; | |
452 | } else { | |
453 | x = rtnl_dereference(t->prl); | |
454 | if (x) { | |
455 | t->prl_count = 0; | |
456 | call_rcu(&x->rcu_head, prl_list_destroy_rcu); | |
457 | t->prl = NULL; | |
458 | } | |
459 | } | |
460 | out: | |
461 | return err; | |
462 | } | |
463 | ||
464 | static int | |
465 | isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t) | |
466 | { | |
467 | struct ip_tunnel_prl_entry *p; | |
468 | int ok = 1; | |
469 | ||
470 | rcu_read_lock(); | |
471 | p = __ipip6_tunnel_locate_prl(t, iph->saddr); | |
472 | if (p) { | |
473 | if (p->flags & PRL_DEFAULT) | |
474 | skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; | |
475 | else | |
476 | skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; | |
477 | } else { | |
478 | const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; | |
479 | ||
480 | if (ipv6_addr_is_isatap(addr6) && | |
481 | (addr6->s6_addr32[3] == iph->saddr) && | |
482 | ipv6_chk_prefix(addr6, t->dev)) | |
483 | skb->ndisc_nodetype = NDISC_NODETYPE_HOST; | |
484 | else | |
485 | ok = 0; | |
486 | } | |
487 | rcu_read_unlock(); | |
488 | return ok; | |
489 | } | |
490 | ||
491 | static void ipip6_tunnel_uninit(struct net_device *dev) | |
492 | { | |
493 | struct net *net = dev_net(dev); | |
494 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
495 | ||
496 | if (dev == sitn->fb_tunnel_dev) { | |
497 | RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL); | |
498 | } else { | |
499 | ipip6_tunnel_unlink(sitn, netdev_priv(dev)); | |
500 | ipip6_tunnel_del_prl(netdev_priv(dev), NULL); | |
501 | } | |
502 | dev_put(dev); | |
503 | } | |
504 | ||
505 | ||
506 | static int ipip6_err(struct sk_buff *skb, u32 info) | |
507 | { | |
508 | ||
509 | /* All the routers (except for Linux) return only | |
510 | 8 bytes of packet payload. It means, that precise relaying of | |
511 | ICMP in the real Internet is absolutely infeasible. | |
512 | */ | |
513 | const struct iphdr *iph = (const struct iphdr *)skb->data; | |
514 | const int type = icmp_hdr(skb)->type; | |
515 | const int code = icmp_hdr(skb)->code; | |
516 | struct ip_tunnel *t; | |
517 | int err; | |
518 | ||
519 | switch (type) { | |
520 | default: | |
521 | case ICMP_PARAMETERPROB: | |
522 | return 0; | |
523 | ||
524 | case ICMP_DEST_UNREACH: | |
525 | switch (code) { | |
526 | case ICMP_SR_FAILED: | |
527 | case ICMP_PORT_UNREACH: | |
528 | /* Impossible event. */ | |
529 | return 0; | |
530 | default: | |
531 | /* All others are translated to HOST_UNREACH. | |
532 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
533 | I believe they are just ether pollution. --ANK | |
534 | */ | |
535 | break; | |
536 | } | |
537 | break; | |
538 | case ICMP_TIME_EXCEEDED: | |
539 | if (code != ICMP_EXC_TTL) | |
540 | return 0; | |
541 | break; | |
542 | case ICMP_REDIRECT: | |
543 | break; | |
544 | } | |
545 | ||
546 | err = -ENOENT; | |
547 | ||
548 | rcu_read_lock(); | |
549 | t = ipip6_tunnel_lookup(dev_net(skb->dev), | |
550 | skb->dev, | |
551 | iph->daddr, | |
552 | iph->saddr); | |
553 | if (t == NULL) | |
554 | goto out; | |
555 | ||
556 | if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { | |
557 | ipv4_update_pmtu(skb, dev_net(skb->dev), info, | |
558 | t->dev->ifindex, 0, IPPROTO_IPV6, 0); | |
559 | err = 0; | |
560 | goto out; | |
561 | } | |
562 | if (type == ICMP_REDIRECT) { | |
563 | ipv4_redirect(skb, dev_net(skb->dev), t->dev->ifindex, 0, | |
564 | IPPROTO_IPV6, 0); | |
565 | err = 0; | |
566 | goto out; | |
567 | } | |
568 | ||
569 | if (t->parms.iph.daddr == 0) | |
570 | goto out; | |
571 | ||
572 | err = 0; | |
573 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) | |
574 | goto out; | |
575 | ||
576 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) | |
577 | t->err_count++; | |
578 | else | |
579 | t->err_count = 1; | |
580 | t->err_time = jiffies; | |
581 | out: | |
582 | rcu_read_unlock(); | |
583 | return err; | |
584 | } | |
585 | ||
586 | static inline void ipip6_ecn_decapsulate(const struct iphdr *iph, struct sk_buff *skb) | |
587 | { | |
588 | if (INET_ECN_is_ce(iph->tos)) | |
589 | IP6_ECN_set_ce(ipv6_hdr(skb)); | |
590 | } | |
591 | ||
592 | static int ipip6_rcv(struct sk_buff *skb) | |
593 | { | |
594 | const struct iphdr *iph; | |
595 | struct ip_tunnel *tunnel; | |
596 | ||
597 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
598 | goto out; | |
599 | ||
600 | iph = ip_hdr(skb); | |
601 | ||
602 | rcu_read_lock(); | |
603 | tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, | |
604 | iph->saddr, iph->daddr); | |
605 | if (tunnel != NULL) { | |
606 | struct pcpu_tstats *tstats; | |
607 | ||
608 | secpath_reset(skb); | |
609 | skb->mac_header = skb->network_header; | |
610 | skb_reset_network_header(skb); | |
611 | IPCB(skb)->flags = 0; | |
612 | skb->protocol = htons(ETH_P_IPV6); | |
613 | skb->pkt_type = PACKET_HOST; | |
614 | ||
615 | if ((tunnel->dev->priv_flags & IFF_ISATAP) && | |
616 | !isatap_chksrc(skb, iph, tunnel)) { | |
617 | tunnel->dev->stats.rx_errors++; | |
618 | rcu_read_unlock(); | |
619 | kfree_skb(skb); | |
620 | return 0; | |
621 | } | |
622 | ||
623 | tstats = this_cpu_ptr(tunnel->dev->tstats); | |
624 | tstats->rx_packets++; | |
625 | tstats->rx_bytes += skb->len; | |
626 | ||
627 | __skb_tunnel_rx(skb, tunnel->dev); | |
628 | ||
629 | ipip6_ecn_decapsulate(iph, skb); | |
630 | ||
631 | netif_rx(skb); | |
632 | ||
633 | rcu_read_unlock(); | |
634 | return 0; | |
635 | } | |
636 | ||
637 | /* no tunnel matched, let upstream know, ipsec may handle it */ | |
638 | rcu_read_unlock(); | |
639 | return 1; | |
640 | out: | |
641 | kfree_skb(skb); | |
642 | return 0; | |
643 | } | |
644 | ||
645 | /* | |
646 | * Returns the embedded IPv4 address if the IPv6 address | |
647 | * comes from 6rd / 6to4 (RFC 3056) addr space. | |
648 | */ | |
649 | static inline | |
650 | __be32 try_6rd(const struct in6_addr *v6dst, struct ip_tunnel *tunnel) | |
651 | { | |
652 | __be32 dst = 0; | |
653 | ||
654 | #ifdef CONFIG_IPV6_SIT_6RD | |
655 | if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, | |
656 | tunnel->ip6rd.prefixlen)) { | |
657 | unsigned int pbw0, pbi0; | |
658 | int pbi1; | |
659 | u32 d; | |
660 | ||
661 | pbw0 = tunnel->ip6rd.prefixlen >> 5; | |
662 | pbi0 = tunnel->ip6rd.prefixlen & 0x1f; | |
663 | ||
664 | d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> | |
665 | tunnel->ip6rd.relay_prefixlen; | |
666 | ||
667 | pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; | |
668 | if (pbi1 > 0) | |
669 | d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> | |
670 | (32 - pbi1); | |
671 | ||
672 | dst = tunnel->ip6rd.relay_prefix | htonl(d); | |
673 | } | |
674 | #else | |
675 | if (v6dst->s6_addr16[0] == htons(0x2002)) { | |
676 | /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ | |
677 | memcpy(&dst, &v6dst->s6_addr16[1], 4); | |
678 | } | |
679 | #endif | |
680 | return dst; | |
681 | } | |
682 | ||
683 | /* | |
684 | * This function assumes it is being called from dev_queue_xmit() | |
685 | * and that skb is filled properly by that function. | |
686 | */ | |
687 | ||
688 | static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, | |
689 | struct net_device *dev) | |
690 | { | |
691 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
692 | struct pcpu_tstats *tstats; | |
693 | const struct iphdr *tiph = &tunnel->parms.iph; | |
694 | const struct ipv6hdr *iph6 = ipv6_hdr(skb); | |
695 | u8 tos = tunnel->parms.iph.tos; | |
696 | __be16 df = tiph->frag_off; | |
697 | struct rtable *rt; /* Route to the other host */ | |
698 | struct net_device *tdev; /* Device to other host */ | |
699 | struct iphdr *iph; /* Our new IP header */ | |
700 | unsigned int max_headroom; /* The extra header space needed */ | |
701 | __be32 dst = tiph->daddr; | |
702 | struct flowi4 fl4; | |
703 | int mtu; | |
704 | const struct in6_addr *addr6; | |
705 | int addr_type; | |
706 | ||
707 | if (skb->protocol != htons(ETH_P_IPV6)) | |
708 | goto tx_error; | |
709 | ||
710 | if (tos == 1) | |
711 | tos = ipv6_get_dsfield(iph6); | |
712 | ||
713 | /* ISATAP (RFC4214) - must come before 6to4 */ | |
714 | if (dev->priv_flags & IFF_ISATAP) { | |
715 | struct neighbour *neigh = NULL; | |
716 | bool do_tx_error = false; | |
717 | ||
718 | if (skb_dst(skb)) | |
719 | neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); | |
720 | ||
721 | if (neigh == NULL) { | |
722 | net_dbg_ratelimited("sit: nexthop == NULL\n"); | |
723 | goto tx_error; | |
724 | } | |
725 | ||
726 | addr6 = (const struct in6_addr *)&neigh->primary_key; | |
727 | addr_type = ipv6_addr_type(addr6); | |
728 | ||
729 | if ((addr_type & IPV6_ADDR_UNICAST) && | |
730 | ipv6_addr_is_isatap(addr6)) | |
731 | dst = addr6->s6_addr32[3]; | |
732 | else | |
733 | do_tx_error = true; | |
734 | ||
735 | neigh_release(neigh); | |
736 | if (do_tx_error) | |
737 | goto tx_error; | |
738 | } | |
739 | ||
740 | if (!dst) | |
741 | dst = try_6rd(&iph6->daddr, tunnel); | |
742 | ||
743 | if (!dst) { | |
744 | struct neighbour *neigh = NULL; | |
745 | bool do_tx_error = false; | |
746 | ||
747 | if (skb_dst(skb)) | |
748 | neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); | |
749 | ||
750 | if (neigh == NULL) { | |
751 | net_dbg_ratelimited("sit: nexthop == NULL\n"); | |
752 | goto tx_error; | |
753 | } | |
754 | ||
755 | addr6 = (const struct in6_addr *)&neigh->primary_key; | |
756 | addr_type = ipv6_addr_type(addr6); | |
757 | ||
758 | if (addr_type == IPV6_ADDR_ANY) { | |
759 | addr6 = &ipv6_hdr(skb)->daddr; | |
760 | addr_type = ipv6_addr_type(addr6); | |
761 | } | |
762 | ||
763 | if ((addr_type & IPV6_ADDR_COMPATv4) != 0) | |
764 | dst = addr6->s6_addr32[3]; | |
765 | else | |
766 | do_tx_error = true; | |
767 | ||
768 | neigh_release(neigh); | |
769 | if (do_tx_error) | |
770 | goto tx_error; | |
771 | } | |
772 | ||
773 | rt = ip_route_output_ports(dev_net(dev), &fl4, NULL, | |
774 | dst, tiph->saddr, | |
775 | 0, 0, | |
776 | IPPROTO_IPV6, RT_TOS(tos), | |
777 | tunnel->parms.link); | |
778 | if (IS_ERR(rt)) { | |
779 | dev->stats.tx_carrier_errors++; | |
780 | goto tx_error_icmp; | |
781 | } | |
782 | if (rt->rt_type != RTN_UNICAST) { | |
783 | ip_rt_put(rt); | |
784 | dev->stats.tx_carrier_errors++; | |
785 | goto tx_error_icmp; | |
786 | } | |
787 | tdev = rt->dst.dev; | |
788 | ||
789 | if (tdev == dev) { | |
790 | ip_rt_put(rt); | |
791 | dev->stats.collisions++; | |
792 | goto tx_error; | |
793 | } | |
794 | ||
795 | if (df) { | |
796 | mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr); | |
797 | ||
798 | if (mtu < 68) { | |
799 | dev->stats.collisions++; | |
800 | ip_rt_put(rt); | |
801 | goto tx_error; | |
802 | } | |
803 | ||
804 | if (mtu < IPV6_MIN_MTU) { | |
805 | mtu = IPV6_MIN_MTU; | |
806 | df = 0; | |
807 | } | |
808 | ||
809 | if (tunnel->parms.iph.daddr && skb_dst(skb)) | |
810 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); | |
811 | ||
812 | if (skb->len > mtu) { | |
813 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); | |
814 | ip_rt_put(rt); | |
815 | goto tx_error; | |
816 | } | |
817 | } | |
818 | ||
819 | if (tunnel->err_count > 0) { | |
820 | if (time_before(jiffies, | |
821 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
822 | tunnel->err_count--; | |
823 | dst_link_failure(skb); | |
824 | } else | |
825 | tunnel->err_count = 0; | |
826 | } | |
827 | ||
828 | /* | |
829 | * Okay, now see if we can stuff it in the buffer as-is. | |
830 | */ | |
831 | max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr); | |
832 | ||
833 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || | |
834 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
835 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); | |
836 | if (!new_skb) { | |
837 | ip_rt_put(rt); | |
838 | dev->stats.tx_dropped++; | |
839 | dev_kfree_skb(skb); | |
840 | return NETDEV_TX_OK; | |
841 | } | |
842 | if (skb->sk) | |
843 | skb_set_owner_w(new_skb, skb->sk); | |
844 | dev_kfree_skb(skb); | |
845 | skb = new_skb; | |
846 | iph6 = ipv6_hdr(skb); | |
847 | } | |
848 | ||
849 | skb->transport_header = skb->network_header; | |
850 | skb_push(skb, sizeof(struct iphdr)); | |
851 | skb_reset_network_header(skb); | |
852 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); | |
853 | IPCB(skb)->flags = 0; | |
854 | skb_dst_drop(skb); | |
855 | skb_dst_set(skb, &rt->dst); | |
856 | ||
857 | /* | |
858 | * Push down and install the IPIP header. | |
859 | */ | |
860 | ||
861 | iph = ip_hdr(skb); | |
862 | iph->version = 4; | |
863 | iph->ihl = sizeof(struct iphdr)>>2; | |
864 | iph->frag_off = df; | |
865 | iph->protocol = IPPROTO_IPV6; | |
866 | iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); | |
867 | iph->daddr = fl4.daddr; | |
868 | iph->saddr = fl4.saddr; | |
869 | ||
870 | if ((iph->ttl = tiph->ttl) == 0) | |
871 | iph->ttl = iph6->hop_limit; | |
872 | ||
873 | nf_reset(skb); | |
874 | tstats = this_cpu_ptr(dev->tstats); | |
875 | __IPTUNNEL_XMIT(tstats, &dev->stats); | |
876 | return NETDEV_TX_OK; | |
877 | ||
878 | tx_error_icmp: | |
879 | dst_link_failure(skb); | |
880 | tx_error: | |
881 | dev->stats.tx_errors++; | |
882 | dev_kfree_skb(skb); | |
883 | return NETDEV_TX_OK; | |
884 | } | |
885 | ||
886 | static void ipip6_tunnel_bind_dev(struct net_device *dev) | |
887 | { | |
888 | struct net_device *tdev = NULL; | |
889 | struct ip_tunnel *tunnel; | |
890 | const struct iphdr *iph; | |
891 | struct flowi4 fl4; | |
892 | ||
893 | tunnel = netdev_priv(dev); | |
894 | iph = &tunnel->parms.iph; | |
895 | ||
896 | if (iph->daddr) { | |
897 | struct rtable *rt = ip_route_output_ports(dev_net(dev), &fl4, NULL, | |
898 | iph->daddr, iph->saddr, | |
899 | 0, 0, | |
900 | IPPROTO_IPV6, | |
901 | RT_TOS(iph->tos), | |
902 | tunnel->parms.link); | |
903 | ||
904 | if (!IS_ERR(rt)) { | |
905 | tdev = rt->dst.dev; | |
906 | ip_rt_put(rt); | |
907 | } | |
908 | dev->flags |= IFF_POINTOPOINT; | |
909 | } | |
910 | ||
911 | if (!tdev && tunnel->parms.link) | |
912 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); | |
913 | ||
914 | if (tdev) { | |
915 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); | |
916 | dev->mtu = tdev->mtu - sizeof(struct iphdr); | |
917 | if (dev->mtu < IPV6_MIN_MTU) | |
918 | dev->mtu = IPV6_MIN_MTU; | |
919 | } | |
920 | dev->iflink = tunnel->parms.link; | |
921 | } | |
922 | ||
923 | static int | |
924 | ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
925 | { | |
926 | int err = 0; | |
927 | struct ip_tunnel_parm p; | |
928 | struct ip_tunnel_prl prl; | |
929 | struct ip_tunnel *t; | |
930 | struct net *net = dev_net(dev); | |
931 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
932 | #ifdef CONFIG_IPV6_SIT_6RD | |
933 | struct ip_tunnel_6rd ip6rd; | |
934 | #endif | |
935 | ||
936 | switch (cmd) { | |
937 | case SIOCGETTUNNEL: | |
938 | #ifdef CONFIG_IPV6_SIT_6RD | |
939 | case SIOCGET6RD: | |
940 | #endif | |
941 | t = NULL; | |
942 | if (dev == sitn->fb_tunnel_dev) { | |
943 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { | |
944 | err = -EFAULT; | |
945 | break; | |
946 | } | |
947 | t = ipip6_tunnel_locate(net, &p, 0); | |
948 | } | |
949 | if (t == NULL) | |
950 | t = netdev_priv(dev); | |
951 | ||
952 | err = -EFAULT; | |
953 | if (cmd == SIOCGETTUNNEL) { | |
954 | memcpy(&p, &t->parms, sizeof(p)); | |
955 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, | |
956 | sizeof(p))) | |
957 | goto done; | |
958 | #ifdef CONFIG_IPV6_SIT_6RD | |
959 | } else { | |
960 | ip6rd.prefix = t->ip6rd.prefix; | |
961 | ip6rd.relay_prefix = t->ip6rd.relay_prefix; | |
962 | ip6rd.prefixlen = t->ip6rd.prefixlen; | |
963 | ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; | |
964 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd, | |
965 | sizeof(ip6rd))) | |
966 | goto done; | |
967 | #endif | |
968 | } | |
969 | err = 0; | |
970 | break; | |
971 | ||
972 | case SIOCADDTUNNEL: | |
973 | case SIOCCHGTUNNEL: | |
974 | err = -EPERM; | |
975 | if (!capable(CAP_NET_ADMIN)) | |
976 | goto done; | |
977 | ||
978 | err = -EFAULT; | |
979 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
980 | goto done; | |
981 | ||
982 | err = -EINVAL; | |
983 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 || | |
984 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) | |
985 | goto done; | |
986 | if (p.iph.ttl) | |
987 | p.iph.frag_off |= htons(IP_DF); | |
988 | ||
989 | t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); | |
990 | ||
991 | if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { | |
992 | if (t != NULL) { | |
993 | if (t->dev != dev) { | |
994 | err = -EEXIST; | |
995 | break; | |
996 | } | |
997 | } else { | |
998 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || | |
999 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { | |
1000 | err = -EINVAL; | |
1001 | break; | |
1002 | } | |
1003 | t = netdev_priv(dev); | |
1004 | ipip6_tunnel_unlink(sitn, t); | |
1005 | synchronize_net(); | |
1006 | t->parms.iph.saddr = p.iph.saddr; | |
1007 | t->parms.iph.daddr = p.iph.daddr; | |
1008 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
1009 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
1010 | ipip6_tunnel_link(sitn, t); | |
1011 | netdev_state_change(dev); | |
1012 | } | |
1013 | } | |
1014 | ||
1015 | if (t) { | |
1016 | err = 0; | |
1017 | if (cmd == SIOCCHGTUNNEL) { | |
1018 | t->parms.iph.ttl = p.iph.ttl; | |
1019 | t->parms.iph.tos = p.iph.tos; | |
1020 | if (t->parms.link != p.link) { | |
1021 | t->parms.link = p.link; | |
1022 | ipip6_tunnel_bind_dev(dev); | |
1023 | netdev_state_change(dev); | |
1024 | } | |
1025 | } | |
1026 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) | |
1027 | err = -EFAULT; | |
1028 | } else | |
1029 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1030 | break; | |
1031 | ||
1032 | case SIOCDELTUNNEL: | |
1033 | err = -EPERM; | |
1034 | if (!capable(CAP_NET_ADMIN)) | |
1035 | goto done; | |
1036 | ||
1037 | if (dev == sitn->fb_tunnel_dev) { | |
1038 | err = -EFAULT; | |
1039 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1040 | goto done; | |
1041 | err = -ENOENT; | |
1042 | if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL) | |
1043 | goto done; | |
1044 | err = -EPERM; | |
1045 | if (t == netdev_priv(sitn->fb_tunnel_dev)) | |
1046 | goto done; | |
1047 | dev = t->dev; | |
1048 | } | |
1049 | unregister_netdevice(dev); | |
1050 | err = 0; | |
1051 | break; | |
1052 | ||
1053 | case SIOCGETPRL: | |
1054 | err = -EINVAL; | |
1055 | if (dev == sitn->fb_tunnel_dev) | |
1056 | goto done; | |
1057 | err = -ENOENT; | |
1058 | if (!(t = netdev_priv(dev))) | |
1059 | goto done; | |
1060 | err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data); | |
1061 | break; | |
1062 | ||
1063 | case SIOCADDPRL: | |
1064 | case SIOCDELPRL: | |
1065 | case SIOCCHGPRL: | |
1066 | err = -EPERM; | |
1067 | if (!capable(CAP_NET_ADMIN)) | |
1068 | goto done; | |
1069 | err = -EINVAL; | |
1070 | if (dev == sitn->fb_tunnel_dev) | |
1071 | goto done; | |
1072 | err = -EFAULT; | |
1073 | if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) | |
1074 | goto done; | |
1075 | err = -ENOENT; | |
1076 | if (!(t = netdev_priv(dev))) | |
1077 | goto done; | |
1078 | ||
1079 | switch (cmd) { | |
1080 | case SIOCDELPRL: | |
1081 | err = ipip6_tunnel_del_prl(t, &prl); | |
1082 | break; | |
1083 | case SIOCADDPRL: | |
1084 | case SIOCCHGPRL: | |
1085 | err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); | |
1086 | break; | |
1087 | } | |
1088 | netdev_state_change(dev); | |
1089 | break; | |
1090 | ||
1091 | #ifdef CONFIG_IPV6_SIT_6RD | |
1092 | case SIOCADD6RD: | |
1093 | case SIOCCHG6RD: | |
1094 | case SIOCDEL6RD: | |
1095 | err = -EPERM; | |
1096 | if (!capable(CAP_NET_ADMIN)) | |
1097 | goto done; | |
1098 | ||
1099 | err = -EFAULT; | |
1100 | if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data, | |
1101 | sizeof(ip6rd))) | |
1102 | goto done; | |
1103 | ||
1104 | t = netdev_priv(dev); | |
1105 | ||
1106 | if (cmd != SIOCDEL6RD) { | |
1107 | struct in6_addr prefix; | |
1108 | __be32 relay_prefix; | |
1109 | ||
1110 | err = -EINVAL; | |
1111 | if (ip6rd.relay_prefixlen > 32 || | |
1112 | ip6rd.prefixlen + (32 - ip6rd.relay_prefixlen) > 64) | |
1113 | goto done; | |
1114 | ||
1115 | ipv6_addr_prefix(&prefix, &ip6rd.prefix, | |
1116 | ip6rd.prefixlen); | |
1117 | if (!ipv6_addr_equal(&prefix, &ip6rd.prefix)) | |
1118 | goto done; | |
1119 | if (ip6rd.relay_prefixlen) | |
1120 | relay_prefix = ip6rd.relay_prefix & | |
1121 | htonl(0xffffffffUL << | |
1122 | (32 - ip6rd.relay_prefixlen)); | |
1123 | else | |
1124 | relay_prefix = 0; | |
1125 | if (relay_prefix != ip6rd.relay_prefix) | |
1126 | goto done; | |
1127 | ||
1128 | t->ip6rd.prefix = prefix; | |
1129 | t->ip6rd.relay_prefix = relay_prefix; | |
1130 | t->ip6rd.prefixlen = ip6rd.prefixlen; | |
1131 | t->ip6rd.relay_prefixlen = ip6rd.relay_prefixlen; | |
1132 | } else | |
1133 | ipip6_tunnel_clone_6rd(dev, sitn); | |
1134 | ||
1135 | err = 0; | |
1136 | break; | |
1137 | #endif | |
1138 | ||
1139 | default: | |
1140 | err = -EINVAL; | |
1141 | } | |
1142 | ||
1143 | done: | |
1144 | return err; | |
1145 | } | |
1146 | ||
1147 | static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu) | |
1148 | { | |
1149 | if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr)) | |
1150 | return -EINVAL; | |
1151 | dev->mtu = new_mtu; | |
1152 | return 0; | |
1153 | } | |
1154 | ||
1155 | static const struct net_device_ops ipip6_netdev_ops = { | |
1156 | .ndo_uninit = ipip6_tunnel_uninit, | |
1157 | .ndo_start_xmit = ipip6_tunnel_xmit, | |
1158 | .ndo_do_ioctl = ipip6_tunnel_ioctl, | |
1159 | .ndo_change_mtu = ipip6_tunnel_change_mtu, | |
1160 | .ndo_get_stats64= ipip6_get_stats64, | |
1161 | }; | |
1162 | ||
1163 | static void ipip6_dev_free(struct net_device *dev) | |
1164 | { | |
1165 | free_percpu(dev->tstats); | |
1166 | free_netdev(dev); | |
1167 | } | |
1168 | ||
1169 | static void ipip6_tunnel_setup(struct net_device *dev) | |
1170 | { | |
1171 | dev->netdev_ops = &ipip6_netdev_ops; | |
1172 | dev->destructor = ipip6_dev_free; | |
1173 | ||
1174 | dev->type = ARPHRD_SIT; | |
1175 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); | |
1176 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); | |
1177 | dev->flags = IFF_NOARP; | |
1178 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; | |
1179 | dev->iflink = 0; | |
1180 | dev->addr_len = 4; | |
1181 | dev->features |= NETIF_F_NETNS_LOCAL; | |
1182 | dev->features |= NETIF_F_LLTX; | |
1183 | } | |
1184 | ||
1185 | static int ipip6_tunnel_init(struct net_device *dev) | |
1186 | { | |
1187 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1188 | ||
1189 | tunnel->dev = dev; | |
1190 | ||
1191 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
1192 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
1193 | ||
1194 | ipip6_tunnel_bind_dev(dev); | |
1195 | dev->tstats = alloc_percpu(struct pcpu_tstats); | |
1196 | if (!dev->tstats) | |
1197 | return -ENOMEM; | |
1198 | ||
1199 | return 0; | |
1200 | } | |
1201 | ||
1202 | static int __net_init ipip6_fb_tunnel_init(struct net_device *dev) | |
1203 | { | |
1204 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1205 | struct iphdr *iph = &tunnel->parms.iph; | |
1206 | struct net *net = dev_net(dev); | |
1207 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1208 | ||
1209 | tunnel->dev = dev; | |
1210 | strcpy(tunnel->parms.name, dev->name); | |
1211 | ||
1212 | iph->version = 4; | |
1213 | iph->protocol = IPPROTO_IPV6; | |
1214 | iph->ihl = 5; | |
1215 | iph->ttl = 64; | |
1216 | ||
1217 | dev->tstats = alloc_percpu(struct pcpu_tstats); | |
1218 | if (!dev->tstats) | |
1219 | return -ENOMEM; | |
1220 | dev_hold(dev); | |
1221 | rcu_assign_pointer(sitn->tunnels_wc[0], tunnel); | |
1222 | return 0; | |
1223 | } | |
1224 | ||
1225 | static struct xfrm_tunnel sit_handler __read_mostly = { | |
1226 | .handler = ipip6_rcv, | |
1227 | .err_handler = ipip6_err, | |
1228 | .priority = 1, | |
1229 | }; | |
1230 | ||
1231 | static void __net_exit sit_destroy_tunnels(struct sit_net *sitn, struct list_head *head) | |
1232 | { | |
1233 | int prio; | |
1234 | ||
1235 | for (prio = 1; prio < 4; prio++) { | |
1236 | int h; | |
1237 | for (h = 0; h < HASH_SIZE; h++) { | |
1238 | struct ip_tunnel *t; | |
1239 | ||
1240 | t = rtnl_dereference(sitn->tunnels[prio][h]); | |
1241 | while (t != NULL) { | |
1242 | unregister_netdevice_queue(t->dev, head); | |
1243 | t = rtnl_dereference(t->next); | |
1244 | } | |
1245 | } | |
1246 | } | |
1247 | } | |
1248 | ||
1249 | static int __net_init sit_init_net(struct net *net) | |
1250 | { | |
1251 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1252 | struct ip_tunnel *t; | |
1253 | int err; | |
1254 | ||
1255 | sitn->tunnels[0] = sitn->tunnels_wc; | |
1256 | sitn->tunnels[1] = sitn->tunnels_l; | |
1257 | sitn->tunnels[2] = sitn->tunnels_r; | |
1258 | sitn->tunnels[3] = sitn->tunnels_r_l; | |
1259 | ||
1260 | sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", | |
1261 | ipip6_tunnel_setup); | |
1262 | if (!sitn->fb_tunnel_dev) { | |
1263 | err = -ENOMEM; | |
1264 | goto err_alloc_dev; | |
1265 | } | |
1266 | dev_net_set(sitn->fb_tunnel_dev, net); | |
1267 | ||
1268 | err = ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); | |
1269 | if (err) | |
1270 | goto err_dev_free; | |
1271 | ||
1272 | ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); | |
1273 | ||
1274 | if ((err = register_netdev(sitn->fb_tunnel_dev))) | |
1275 | goto err_reg_dev; | |
1276 | ||
1277 | t = netdev_priv(sitn->fb_tunnel_dev); | |
1278 | ||
1279 | strcpy(t->parms.name, sitn->fb_tunnel_dev->name); | |
1280 | return 0; | |
1281 | ||
1282 | err_reg_dev: | |
1283 | dev_put(sitn->fb_tunnel_dev); | |
1284 | err_dev_free: | |
1285 | ipip6_dev_free(sitn->fb_tunnel_dev); | |
1286 | err_alloc_dev: | |
1287 | return err; | |
1288 | } | |
1289 | ||
1290 | static void __net_exit sit_exit_net(struct net *net) | |
1291 | { | |
1292 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1293 | LIST_HEAD(list); | |
1294 | ||
1295 | rtnl_lock(); | |
1296 | sit_destroy_tunnels(sitn, &list); | |
1297 | unregister_netdevice_queue(sitn->fb_tunnel_dev, &list); | |
1298 | unregister_netdevice_many(&list); | |
1299 | rtnl_unlock(); | |
1300 | } | |
1301 | ||
1302 | static struct pernet_operations sit_net_ops = { | |
1303 | .init = sit_init_net, | |
1304 | .exit = sit_exit_net, | |
1305 | .id = &sit_net_id, | |
1306 | .size = sizeof(struct sit_net), | |
1307 | }; | |
1308 | ||
1309 | static void __exit sit_cleanup(void) | |
1310 | { | |
1311 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); | |
1312 | ||
1313 | unregister_pernet_device(&sit_net_ops); | |
1314 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ | |
1315 | } | |
1316 | ||
1317 | static int __init sit_init(void) | |
1318 | { | |
1319 | int err; | |
1320 | ||
1321 | pr_info("IPv6 over IPv4 tunneling driver\n"); | |
1322 | ||
1323 | err = register_pernet_device(&sit_net_ops); | |
1324 | if (err < 0) | |
1325 | return err; | |
1326 | err = xfrm4_tunnel_register(&sit_handler, AF_INET6); | |
1327 | if (err < 0) { | |
1328 | unregister_pernet_device(&sit_net_ops); | |
1329 | pr_info("%s: can't add protocol\n", __func__); | |
1330 | } | |
1331 | return err; | |
1332 | } | |
1333 | ||
1334 | module_init(sit_init); | |
1335 | module_exit(sit_cleanup); | |
1336 | MODULE_LICENSE("GPL"); | |
1337 | MODULE_ALIAS_NETDEV("sit0"); |