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1 | /* | |
2 | * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT) | |
3 | * Linux INET6 implementation | |
4 | * | |
5 | * Authors: | |
6 | * Pedro Roque <roque@di.fc.ul.pt> | |
7 | * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | * | |
14 | * Changes: | |
15 | * Roger Venning <r.venning@telstra.com>: 6to4 support | |
16 | * Nate Thompson <nate@thebog.net>: 6to4 support | |
17 | * Fred Templin <fred.l.templin@boeing.com>: isatap support | |
18 | */ | |
19 | ||
20 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
21 | ||
22 | #include <linux/module.h> | |
23 | #include <linux/capability.h> | |
24 | #include <linux/errno.h> | |
25 | #include <linux/types.h> | |
26 | #include <linux/socket.h> | |
27 | #include <linux/sockios.h> | |
28 | #include <linux/net.h> | |
29 | #include <linux/in6.h> | |
30 | #include <linux/netdevice.h> | |
31 | #include <linux/if_arp.h> | |
32 | #include <linux/icmp.h> | |
33 | #include <linux/slab.h> | |
34 | #include <asm/uaccess.h> | |
35 | #include <linux/init.h> | |
36 | #include <linux/netfilter_ipv4.h> | |
37 | #include <linux/if_ether.h> | |
38 | ||
39 | #include <net/sock.h> | |
40 | #include <net/snmp.h> | |
41 | ||
42 | #include <net/ipv6.h> | |
43 | #include <net/protocol.h> | |
44 | #include <net/transp_v6.h> | |
45 | #include <net/ip6_fib.h> | |
46 | #include <net/ip6_route.h> | |
47 | #include <net/ndisc.h> | |
48 | #include <net/addrconf.h> | |
49 | #include <net/ip.h> | |
50 | #include <net/udp.h> | |
51 | #include <net/icmp.h> | |
52 | #include <net/ip_tunnels.h> | |
53 | #include <net/inet_ecn.h> | |
54 | #include <net/xfrm.h> | |
55 | #include <net/dsfield.h> | |
56 | #include <net/net_namespace.h> | |
57 | #include <net/netns/generic.h> | |
58 | ||
59 | /* | |
60 | This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c | |
61 | ||
62 | For comments look at net/ipv4/ip_gre.c --ANK | |
63 | */ | |
64 | ||
65 | #define HASH_SIZE 16 | |
66 | #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) | |
67 | ||
68 | static bool log_ecn_error = true; | |
69 | module_param(log_ecn_error, bool, 0644); | |
70 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); | |
71 | ||
72 | static int ipip6_tunnel_init(struct net_device *dev); | |
73 | static void ipip6_tunnel_setup(struct net_device *dev); | |
74 | static void ipip6_dev_free(struct net_device *dev); | |
75 | static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, | |
76 | __be32 *v4dst); | |
77 | static struct rtnl_link_ops sit_link_ops __read_mostly; | |
78 | ||
79 | static int sit_net_id __read_mostly; | |
80 | struct sit_net { | |
81 | struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE]; | |
82 | struct ip_tunnel __rcu *tunnels_r[HASH_SIZE]; | |
83 | struct ip_tunnel __rcu *tunnels_l[HASH_SIZE]; | |
84 | struct ip_tunnel __rcu *tunnels_wc[1]; | |
85 | struct ip_tunnel __rcu **tunnels[4]; | |
86 | ||
87 | struct net_device *fb_tunnel_dev; | |
88 | }; | |
89 | ||
90 | static struct rtnl_link_stats64 *ipip6_get_stats64(struct net_device *dev, | |
91 | struct rtnl_link_stats64 *tot) | |
92 | { | |
93 | int i; | |
94 | ||
95 | for_each_possible_cpu(i) { | |
96 | const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i); | |
97 | u64 rx_packets, rx_bytes, tx_packets, tx_bytes; | |
98 | unsigned int start; | |
99 | ||
100 | do { | |
101 | start = u64_stats_fetch_begin_bh(&tstats->syncp); | |
102 | rx_packets = tstats->rx_packets; | |
103 | tx_packets = tstats->tx_packets; | |
104 | rx_bytes = tstats->rx_bytes; | |
105 | tx_bytes = tstats->tx_bytes; | |
106 | } while (u64_stats_fetch_retry_bh(&tstats->syncp, start)); | |
107 | ||
108 | tot->rx_packets += rx_packets; | |
109 | tot->tx_packets += tx_packets; | |
110 | tot->rx_bytes += rx_bytes; | |
111 | tot->tx_bytes += tx_bytes; | |
112 | } | |
113 | ||
114 | tot->rx_errors = dev->stats.rx_errors; | |
115 | tot->rx_frame_errors = dev->stats.rx_frame_errors; | |
116 | tot->tx_fifo_errors = dev->stats.tx_fifo_errors; | |
117 | tot->tx_carrier_errors = dev->stats.tx_carrier_errors; | |
118 | tot->tx_dropped = dev->stats.tx_dropped; | |
119 | tot->tx_aborted_errors = dev->stats.tx_aborted_errors; | |
120 | tot->tx_errors = dev->stats.tx_errors; | |
121 | ||
122 | return tot; | |
123 | } | |
124 | ||
125 | /* | |
126 | * Must be invoked with rcu_read_lock | |
127 | */ | |
128 | static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net, | |
129 | struct net_device *dev, __be32 remote, __be32 local) | |
130 | { | |
131 | unsigned int h0 = HASH(remote); | |
132 | unsigned int h1 = HASH(local); | |
133 | struct ip_tunnel *t; | |
134 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
135 | ||
136 | for_each_ip_tunnel_rcu(t, sitn->tunnels_r_l[h0 ^ h1]) { | |
137 | if (local == t->parms.iph.saddr && | |
138 | remote == t->parms.iph.daddr && | |
139 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
140 | (t->dev->flags & IFF_UP)) | |
141 | return t; | |
142 | } | |
143 | for_each_ip_tunnel_rcu(t, sitn->tunnels_r[h0]) { | |
144 | if (remote == t->parms.iph.daddr && | |
145 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
146 | (t->dev->flags & IFF_UP)) | |
147 | return t; | |
148 | } | |
149 | for_each_ip_tunnel_rcu(t, sitn->tunnels_l[h1]) { | |
150 | if (local == t->parms.iph.saddr && | |
151 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
152 | (t->dev->flags & IFF_UP)) | |
153 | return t; | |
154 | } | |
155 | t = rcu_dereference(sitn->tunnels_wc[0]); | |
156 | if ((t != NULL) && (t->dev->flags & IFF_UP)) | |
157 | return t; | |
158 | return NULL; | |
159 | } | |
160 | ||
161 | static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn, | |
162 | struct ip_tunnel_parm *parms) | |
163 | { | |
164 | __be32 remote = parms->iph.daddr; | |
165 | __be32 local = parms->iph.saddr; | |
166 | unsigned int h = 0; | |
167 | int prio = 0; | |
168 | ||
169 | if (remote) { | |
170 | prio |= 2; | |
171 | h ^= HASH(remote); | |
172 | } | |
173 | if (local) { | |
174 | prio |= 1; | |
175 | h ^= HASH(local); | |
176 | } | |
177 | return &sitn->tunnels[prio][h]; | |
178 | } | |
179 | ||
180 | static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn, | |
181 | struct ip_tunnel *t) | |
182 | { | |
183 | return __ipip6_bucket(sitn, &t->parms); | |
184 | } | |
185 | ||
186 | static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t) | |
187 | { | |
188 | struct ip_tunnel __rcu **tp; | |
189 | struct ip_tunnel *iter; | |
190 | ||
191 | for (tp = ipip6_bucket(sitn, t); | |
192 | (iter = rtnl_dereference(*tp)) != NULL; | |
193 | tp = &iter->next) { | |
194 | if (t == iter) { | |
195 | rcu_assign_pointer(*tp, t->next); | |
196 | break; | |
197 | } | |
198 | } | |
199 | } | |
200 | ||
201 | static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t) | |
202 | { | |
203 | struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t); | |
204 | ||
205 | rcu_assign_pointer(t->next, rtnl_dereference(*tp)); | |
206 | rcu_assign_pointer(*tp, t); | |
207 | } | |
208 | ||
209 | static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn) | |
210 | { | |
211 | #ifdef CONFIG_IPV6_SIT_6RD | |
212 | struct ip_tunnel *t = netdev_priv(dev); | |
213 | ||
214 | if (t->dev == sitn->fb_tunnel_dev) { | |
215 | ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0); | |
216 | t->ip6rd.relay_prefix = 0; | |
217 | t->ip6rd.prefixlen = 16; | |
218 | t->ip6rd.relay_prefixlen = 0; | |
219 | } else { | |
220 | struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev); | |
221 | memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd)); | |
222 | } | |
223 | #endif | |
224 | } | |
225 | ||
226 | static int ipip6_tunnel_create(struct net_device *dev) | |
227 | { | |
228 | struct ip_tunnel *t = netdev_priv(dev); | |
229 | struct net *net = dev_net(dev); | |
230 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
231 | int err; | |
232 | ||
233 | err = ipip6_tunnel_init(dev); | |
234 | if (err < 0) | |
235 | goto out; | |
236 | ipip6_tunnel_clone_6rd(dev, sitn); | |
237 | ||
238 | if ((__force u16)t->parms.i_flags & SIT_ISATAP) | |
239 | dev->priv_flags |= IFF_ISATAP; | |
240 | ||
241 | err = register_netdevice(dev); | |
242 | if (err < 0) | |
243 | goto out; | |
244 | ||
245 | strcpy(t->parms.name, dev->name); | |
246 | dev->rtnl_link_ops = &sit_link_ops; | |
247 | ||
248 | dev_hold(dev); | |
249 | ||
250 | ipip6_tunnel_link(sitn, t); | |
251 | return 0; | |
252 | ||
253 | out: | |
254 | return err; | |
255 | } | |
256 | ||
257 | static struct ip_tunnel *ipip6_tunnel_locate(struct net *net, | |
258 | struct ip_tunnel_parm *parms, int create) | |
259 | { | |
260 | __be32 remote = parms->iph.daddr; | |
261 | __be32 local = parms->iph.saddr; | |
262 | struct ip_tunnel *t, *nt; | |
263 | struct ip_tunnel __rcu **tp; | |
264 | struct net_device *dev; | |
265 | char name[IFNAMSIZ]; | |
266 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
267 | ||
268 | for (tp = __ipip6_bucket(sitn, parms); | |
269 | (t = rtnl_dereference(*tp)) != NULL; | |
270 | tp = &t->next) { | |
271 | if (local == t->parms.iph.saddr && | |
272 | remote == t->parms.iph.daddr && | |
273 | parms->link == t->parms.link) { | |
274 | if (create) | |
275 | return NULL; | |
276 | else | |
277 | return t; | |
278 | } | |
279 | } | |
280 | if (!create) | |
281 | goto failed; | |
282 | ||
283 | if (parms->name[0]) | |
284 | strlcpy(name, parms->name, IFNAMSIZ); | |
285 | else | |
286 | strcpy(name, "sit%d"); | |
287 | ||
288 | dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup); | |
289 | if (dev == NULL) | |
290 | return NULL; | |
291 | ||
292 | dev_net_set(dev, net); | |
293 | ||
294 | nt = netdev_priv(dev); | |
295 | ||
296 | nt->parms = *parms; | |
297 | if (ipip6_tunnel_create(dev) < 0) | |
298 | goto failed_free; | |
299 | ||
300 | return nt; | |
301 | ||
302 | failed_free: | |
303 | ipip6_dev_free(dev); | |
304 | failed: | |
305 | return NULL; | |
306 | } | |
307 | ||
308 | #define for_each_prl_rcu(start) \ | |
309 | for (prl = rcu_dereference(start); \ | |
310 | prl; \ | |
311 | prl = rcu_dereference(prl->next)) | |
312 | ||
313 | static struct ip_tunnel_prl_entry * | |
314 | __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) | |
315 | { | |
316 | struct ip_tunnel_prl_entry *prl; | |
317 | ||
318 | for_each_prl_rcu(t->prl) | |
319 | if (prl->addr == addr) | |
320 | break; | |
321 | return prl; | |
322 | ||
323 | } | |
324 | ||
325 | static int ipip6_tunnel_get_prl(struct ip_tunnel *t, | |
326 | struct ip_tunnel_prl __user *a) | |
327 | { | |
328 | struct ip_tunnel_prl kprl, *kp; | |
329 | struct ip_tunnel_prl_entry *prl; | |
330 | unsigned int cmax, c = 0, ca, len; | |
331 | int ret = 0; | |
332 | ||
333 | if (copy_from_user(&kprl, a, sizeof(kprl))) | |
334 | return -EFAULT; | |
335 | cmax = kprl.datalen / sizeof(kprl); | |
336 | if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) | |
337 | cmax = 1; | |
338 | ||
339 | /* For simple GET or for root users, | |
340 | * we try harder to allocate. | |
341 | */ | |
342 | kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? | |
343 | kcalloc(cmax, sizeof(*kp), GFP_KERNEL) : | |
344 | NULL; | |
345 | ||
346 | rcu_read_lock(); | |
347 | ||
348 | ca = t->prl_count < cmax ? t->prl_count : cmax; | |
349 | ||
350 | if (!kp) { | |
351 | /* We don't try hard to allocate much memory for | |
352 | * non-root users. | |
353 | * For root users, retry allocating enough memory for | |
354 | * the answer. | |
355 | */ | |
356 | kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC); | |
357 | if (!kp) { | |
358 | ret = -ENOMEM; | |
359 | goto out; | |
360 | } | |
361 | } | |
362 | ||
363 | c = 0; | |
364 | for_each_prl_rcu(t->prl) { | |
365 | if (c >= cmax) | |
366 | break; | |
367 | if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) | |
368 | continue; | |
369 | kp[c].addr = prl->addr; | |
370 | kp[c].flags = prl->flags; | |
371 | c++; | |
372 | if (kprl.addr != htonl(INADDR_ANY)) | |
373 | break; | |
374 | } | |
375 | out: | |
376 | rcu_read_unlock(); | |
377 | ||
378 | len = sizeof(*kp) * c; | |
379 | ret = 0; | |
380 | if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) | |
381 | ret = -EFAULT; | |
382 | ||
383 | kfree(kp); | |
384 | ||
385 | return ret; | |
386 | } | |
387 | ||
388 | static int | |
389 | ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) | |
390 | { | |
391 | struct ip_tunnel_prl_entry *p; | |
392 | int err = 0; | |
393 | ||
394 | if (a->addr == htonl(INADDR_ANY)) | |
395 | return -EINVAL; | |
396 | ||
397 | ASSERT_RTNL(); | |
398 | ||
399 | for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) { | |
400 | if (p->addr == a->addr) { | |
401 | if (chg) { | |
402 | p->flags = a->flags; | |
403 | goto out; | |
404 | } | |
405 | err = -EEXIST; | |
406 | goto out; | |
407 | } | |
408 | } | |
409 | ||
410 | if (chg) { | |
411 | err = -ENXIO; | |
412 | goto out; | |
413 | } | |
414 | ||
415 | p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); | |
416 | if (!p) { | |
417 | err = -ENOBUFS; | |
418 | goto out; | |
419 | } | |
420 | ||
421 | p->next = t->prl; | |
422 | p->addr = a->addr; | |
423 | p->flags = a->flags; | |
424 | t->prl_count++; | |
425 | rcu_assign_pointer(t->prl, p); | |
426 | out: | |
427 | return err; | |
428 | } | |
429 | ||
430 | static void prl_list_destroy_rcu(struct rcu_head *head) | |
431 | { | |
432 | struct ip_tunnel_prl_entry *p, *n; | |
433 | ||
434 | p = container_of(head, struct ip_tunnel_prl_entry, rcu_head); | |
435 | do { | |
436 | n = rcu_dereference_protected(p->next, 1); | |
437 | kfree(p); | |
438 | p = n; | |
439 | } while (p); | |
440 | } | |
441 | ||
442 | static int | |
443 | ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) | |
444 | { | |
445 | struct ip_tunnel_prl_entry *x; | |
446 | struct ip_tunnel_prl_entry __rcu **p; | |
447 | int err = 0; | |
448 | ||
449 | ASSERT_RTNL(); | |
450 | ||
451 | if (a && a->addr != htonl(INADDR_ANY)) { | |
452 | for (p = &t->prl; | |
453 | (x = rtnl_dereference(*p)) != NULL; | |
454 | p = &x->next) { | |
455 | if (x->addr == a->addr) { | |
456 | *p = x->next; | |
457 | kfree_rcu(x, rcu_head); | |
458 | t->prl_count--; | |
459 | goto out; | |
460 | } | |
461 | } | |
462 | err = -ENXIO; | |
463 | } else { | |
464 | x = rtnl_dereference(t->prl); | |
465 | if (x) { | |
466 | t->prl_count = 0; | |
467 | call_rcu(&x->rcu_head, prl_list_destroy_rcu); | |
468 | t->prl = NULL; | |
469 | } | |
470 | } | |
471 | out: | |
472 | return err; | |
473 | } | |
474 | ||
475 | static int | |
476 | isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t) | |
477 | { | |
478 | struct ip_tunnel_prl_entry *p; | |
479 | int ok = 1; | |
480 | ||
481 | rcu_read_lock(); | |
482 | p = __ipip6_tunnel_locate_prl(t, iph->saddr); | |
483 | if (p) { | |
484 | if (p->flags & PRL_DEFAULT) | |
485 | skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; | |
486 | else | |
487 | skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; | |
488 | } else { | |
489 | const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; | |
490 | ||
491 | if (ipv6_addr_is_isatap(addr6) && | |
492 | (addr6->s6_addr32[3] == iph->saddr) && | |
493 | ipv6_chk_prefix(addr6, t->dev)) | |
494 | skb->ndisc_nodetype = NDISC_NODETYPE_HOST; | |
495 | else | |
496 | ok = 0; | |
497 | } | |
498 | rcu_read_unlock(); | |
499 | return ok; | |
500 | } | |
501 | ||
502 | static void ipip6_tunnel_uninit(struct net_device *dev) | |
503 | { | |
504 | struct net *net = dev_net(dev); | |
505 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
506 | ||
507 | if (dev == sitn->fb_tunnel_dev) { | |
508 | RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL); | |
509 | } else { | |
510 | ipip6_tunnel_unlink(sitn, netdev_priv(dev)); | |
511 | ipip6_tunnel_del_prl(netdev_priv(dev), NULL); | |
512 | } | |
513 | dev_put(dev); | |
514 | } | |
515 | ||
516 | ||
517 | static int ipip6_err(struct sk_buff *skb, u32 info) | |
518 | { | |
519 | ||
520 | /* All the routers (except for Linux) return only | |
521 | 8 bytes of packet payload. It means, that precise relaying of | |
522 | ICMP in the real Internet is absolutely infeasible. | |
523 | */ | |
524 | const struct iphdr *iph = (const struct iphdr *)skb->data; | |
525 | const int type = icmp_hdr(skb)->type; | |
526 | const int code = icmp_hdr(skb)->code; | |
527 | struct ip_tunnel *t; | |
528 | int err; | |
529 | ||
530 | switch (type) { | |
531 | default: | |
532 | case ICMP_PARAMETERPROB: | |
533 | return 0; | |
534 | ||
535 | case ICMP_DEST_UNREACH: | |
536 | switch (code) { | |
537 | case ICMP_SR_FAILED: | |
538 | case ICMP_PORT_UNREACH: | |
539 | /* Impossible event. */ | |
540 | return 0; | |
541 | default: | |
542 | /* All others are translated to HOST_UNREACH. | |
543 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
544 | I believe they are just ether pollution. --ANK | |
545 | */ | |
546 | break; | |
547 | } | |
548 | break; | |
549 | case ICMP_TIME_EXCEEDED: | |
550 | if (code != ICMP_EXC_TTL) | |
551 | return 0; | |
552 | break; | |
553 | case ICMP_REDIRECT: | |
554 | break; | |
555 | } | |
556 | ||
557 | err = -ENOENT; | |
558 | ||
559 | t = ipip6_tunnel_lookup(dev_net(skb->dev), | |
560 | skb->dev, | |
561 | iph->daddr, | |
562 | iph->saddr); | |
563 | if (t == NULL) | |
564 | goto out; | |
565 | ||
566 | if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { | |
567 | ipv4_update_pmtu(skb, dev_net(skb->dev), info, | |
568 | t->dev->ifindex, 0, IPPROTO_IPV6, 0); | |
569 | err = 0; | |
570 | goto out; | |
571 | } | |
572 | if (type == ICMP_REDIRECT) { | |
573 | ipv4_redirect(skb, dev_net(skb->dev), t->dev->ifindex, 0, | |
574 | IPPROTO_IPV6, 0); | |
575 | err = 0; | |
576 | goto out; | |
577 | } | |
578 | ||
579 | if (t->parms.iph.daddr == 0) | |
580 | goto out; | |
581 | ||
582 | err = 0; | |
583 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) | |
584 | goto out; | |
585 | ||
586 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) | |
587 | t->err_count++; | |
588 | else | |
589 | t->err_count = 1; | |
590 | t->err_time = jiffies; | |
591 | out: | |
592 | return err; | |
593 | } | |
594 | ||
595 | static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr, | |
596 | const struct in6_addr *v6addr) | |
597 | { | |
598 | __be32 v4embed = 0; | |
599 | if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed) | |
600 | return true; | |
601 | return false; | |
602 | } | |
603 | ||
604 | static int ipip6_rcv(struct sk_buff *skb) | |
605 | { | |
606 | const struct iphdr *iph = ip_hdr(skb); | |
607 | struct ip_tunnel *tunnel; | |
608 | int err; | |
609 | ||
610 | tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, | |
611 | iph->saddr, iph->daddr); | |
612 | if (tunnel != NULL) { | |
613 | struct pcpu_tstats *tstats; | |
614 | ||
615 | secpath_reset(skb); | |
616 | skb->mac_header = skb->network_header; | |
617 | skb_reset_network_header(skb); | |
618 | IPCB(skb)->flags = 0; | |
619 | skb->protocol = htons(ETH_P_IPV6); | |
620 | skb->pkt_type = PACKET_HOST; | |
621 | ||
622 | if (tunnel->dev->priv_flags & IFF_ISATAP) { | |
623 | if (!isatap_chksrc(skb, iph, tunnel)) { | |
624 | tunnel->dev->stats.rx_errors++; | |
625 | goto out; | |
626 | } | |
627 | } else { | |
628 | if (is_spoofed_6rd(tunnel, iph->saddr, | |
629 | &ipv6_hdr(skb)->saddr) || | |
630 | is_spoofed_6rd(tunnel, iph->daddr, | |
631 | &ipv6_hdr(skb)->daddr)) { | |
632 | tunnel->dev->stats.rx_errors++; | |
633 | goto out; | |
634 | } | |
635 | } | |
636 | ||
637 | __skb_tunnel_rx(skb, tunnel->dev); | |
638 | ||
639 | err = IP_ECN_decapsulate(iph, skb); | |
640 | if (unlikely(err)) { | |
641 | if (log_ecn_error) | |
642 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", | |
643 | &iph->saddr, iph->tos); | |
644 | if (err > 1) { | |
645 | ++tunnel->dev->stats.rx_frame_errors; | |
646 | ++tunnel->dev->stats.rx_errors; | |
647 | goto out; | |
648 | } | |
649 | } | |
650 | ||
651 | tstats = this_cpu_ptr(tunnel->dev->tstats); | |
652 | tstats->rx_packets++; | |
653 | tstats->rx_bytes += skb->len; | |
654 | ||
655 | netif_rx(skb); | |
656 | ||
657 | return 0; | |
658 | } | |
659 | ||
660 | /* no tunnel matched, let upstream know, ipsec may handle it */ | |
661 | return 1; | |
662 | out: | |
663 | kfree_skb(skb); | |
664 | return 0; | |
665 | } | |
666 | ||
667 | /* | |
668 | * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function | |
669 | * stores the embedded IPv4 address in v4dst and returns true. | |
670 | */ | |
671 | static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, | |
672 | __be32 *v4dst) | |
673 | { | |
674 | #ifdef CONFIG_IPV6_SIT_6RD | |
675 | if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, | |
676 | tunnel->ip6rd.prefixlen)) { | |
677 | unsigned int pbw0, pbi0; | |
678 | int pbi1; | |
679 | u32 d; | |
680 | ||
681 | pbw0 = tunnel->ip6rd.prefixlen >> 5; | |
682 | pbi0 = tunnel->ip6rd.prefixlen & 0x1f; | |
683 | ||
684 | d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> | |
685 | tunnel->ip6rd.relay_prefixlen; | |
686 | ||
687 | pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; | |
688 | if (pbi1 > 0) | |
689 | d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> | |
690 | (32 - pbi1); | |
691 | ||
692 | *v4dst = tunnel->ip6rd.relay_prefix | htonl(d); | |
693 | return true; | |
694 | } | |
695 | #else | |
696 | if (v6dst->s6_addr16[0] == htons(0x2002)) { | |
697 | /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ | |
698 | memcpy(v4dst, &v6dst->s6_addr16[1], 4); | |
699 | return true; | |
700 | } | |
701 | #endif | |
702 | return false; | |
703 | } | |
704 | ||
705 | static inline __be32 try_6rd(struct ip_tunnel *tunnel, | |
706 | const struct in6_addr *v6dst) | |
707 | { | |
708 | __be32 dst = 0; | |
709 | check_6rd(tunnel, v6dst, &dst); | |
710 | return dst; | |
711 | } | |
712 | ||
713 | /* | |
714 | * This function assumes it is being called from dev_queue_xmit() | |
715 | * and that skb is filled properly by that function. | |
716 | */ | |
717 | ||
718 | static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, | |
719 | struct net_device *dev) | |
720 | { | |
721 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
722 | const struct iphdr *tiph = &tunnel->parms.iph; | |
723 | const struct ipv6hdr *iph6 = ipv6_hdr(skb); | |
724 | u8 tos = tunnel->parms.iph.tos; | |
725 | __be16 df = tiph->frag_off; | |
726 | struct rtable *rt; /* Route to the other host */ | |
727 | struct net_device *tdev; /* Device to other host */ | |
728 | struct iphdr *iph; /* Our new IP header */ | |
729 | unsigned int max_headroom; /* The extra header space needed */ | |
730 | __be32 dst = tiph->daddr; | |
731 | struct flowi4 fl4; | |
732 | int mtu; | |
733 | const struct in6_addr *addr6; | |
734 | int addr_type; | |
735 | ||
736 | if (skb->protocol != htons(ETH_P_IPV6)) | |
737 | goto tx_error; | |
738 | ||
739 | if (tos == 1) | |
740 | tos = ipv6_get_dsfield(iph6); | |
741 | ||
742 | /* ISATAP (RFC4214) - must come before 6to4 */ | |
743 | if (dev->priv_flags & IFF_ISATAP) { | |
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_UNICAST) && | |
759 | ipv6_addr_is_isatap(addr6)) | |
760 | dst = addr6->s6_addr32[3]; | |
761 | else | |
762 | do_tx_error = true; | |
763 | ||
764 | neigh_release(neigh); | |
765 | if (do_tx_error) | |
766 | goto tx_error; | |
767 | } | |
768 | ||
769 | if (!dst) | |
770 | dst = try_6rd(tunnel, &iph6->daddr); | |
771 | ||
772 | if (!dst) { | |
773 | struct neighbour *neigh = NULL; | |
774 | bool do_tx_error = false; | |
775 | ||
776 | if (skb_dst(skb)) | |
777 | neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); | |
778 | ||
779 | if (neigh == NULL) { | |
780 | net_dbg_ratelimited("sit: nexthop == NULL\n"); | |
781 | goto tx_error; | |
782 | } | |
783 | ||
784 | addr6 = (const struct in6_addr *)&neigh->primary_key; | |
785 | addr_type = ipv6_addr_type(addr6); | |
786 | ||
787 | if (addr_type == IPV6_ADDR_ANY) { | |
788 | addr6 = &ipv6_hdr(skb)->daddr; | |
789 | addr_type = ipv6_addr_type(addr6); | |
790 | } | |
791 | ||
792 | if ((addr_type & IPV6_ADDR_COMPATv4) != 0) | |
793 | dst = addr6->s6_addr32[3]; | |
794 | else | |
795 | do_tx_error = true; | |
796 | ||
797 | neigh_release(neigh); | |
798 | if (do_tx_error) | |
799 | goto tx_error; | |
800 | } | |
801 | ||
802 | rt = ip_route_output_ports(dev_net(dev), &fl4, NULL, | |
803 | dst, tiph->saddr, | |
804 | 0, 0, | |
805 | IPPROTO_IPV6, RT_TOS(tos), | |
806 | tunnel->parms.link); | |
807 | if (IS_ERR(rt)) { | |
808 | dev->stats.tx_carrier_errors++; | |
809 | goto tx_error_icmp; | |
810 | } | |
811 | if (rt->rt_type != RTN_UNICAST) { | |
812 | ip_rt_put(rt); | |
813 | dev->stats.tx_carrier_errors++; | |
814 | goto tx_error_icmp; | |
815 | } | |
816 | tdev = rt->dst.dev; | |
817 | ||
818 | if (tdev == dev) { | |
819 | ip_rt_put(rt); | |
820 | dev->stats.collisions++; | |
821 | goto tx_error; | |
822 | } | |
823 | ||
824 | if (df) { | |
825 | mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr); | |
826 | ||
827 | if (mtu < 68) { | |
828 | dev->stats.collisions++; | |
829 | ip_rt_put(rt); | |
830 | goto tx_error; | |
831 | } | |
832 | ||
833 | if (mtu < IPV6_MIN_MTU) { | |
834 | mtu = IPV6_MIN_MTU; | |
835 | df = 0; | |
836 | } | |
837 | ||
838 | if (tunnel->parms.iph.daddr && skb_dst(skb)) | |
839 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); | |
840 | ||
841 | if (skb->len > mtu) { | |
842 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); | |
843 | ip_rt_put(rt); | |
844 | goto tx_error; | |
845 | } | |
846 | } | |
847 | ||
848 | if (tunnel->err_count > 0) { | |
849 | if (time_before(jiffies, | |
850 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
851 | tunnel->err_count--; | |
852 | dst_link_failure(skb); | |
853 | } else | |
854 | tunnel->err_count = 0; | |
855 | } | |
856 | ||
857 | /* | |
858 | * Okay, now see if we can stuff it in the buffer as-is. | |
859 | */ | |
860 | max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr); | |
861 | ||
862 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || | |
863 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
864 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); | |
865 | if (!new_skb) { | |
866 | ip_rt_put(rt); | |
867 | dev->stats.tx_dropped++; | |
868 | dev_kfree_skb(skb); | |
869 | return NETDEV_TX_OK; | |
870 | } | |
871 | if (skb->sk) | |
872 | skb_set_owner_w(new_skb, skb->sk); | |
873 | dev_kfree_skb(skb); | |
874 | skb = new_skb; | |
875 | iph6 = ipv6_hdr(skb); | |
876 | } | |
877 | ||
878 | skb->transport_header = skb->network_header; | |
879 | skb_push(skb, sizeof(struct iphdr)); | |
880 | skb_reset_network_header(skb); | |
881 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); | |
882 | IPCB(skb)->flags = 0; | |
883 | skb_dst_drop(skb); | |
884 | skb_dst_set(skb, &rt->dst); | |
885 | ||
886 | /* | |
887 | * Push down and install the IPIP header. | |
888 | */ | |
889 | ||
890 | iph = ip_hdr(skb); | |
891 | iph->version = 4; | |
892 | iph->ihl = sizeof(struct iphdr)>>2; | |
893 | iph->frag_off = df; | |
894 | iph->protocol = IPPROTO_IPV6; | |
895 | iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); | |
896 | iph->daddr = fl4.daddr; | |
897 | iph->saddr = fl4.saddr; | |
898 | ||
899 | if ((iph->ttl = tiph->ttl) == 0) | |
900 | iph->ttl = iph6->hop_limit; | |
901 | ||
902 | skb->ip_summed = CHECKSUM_NONE; | |
903 | ip_select_ident(iph, skb_dst(skb), NULL); | |
904 | iptunnel_xmit(skb, dev); | |
905 | return NETDEV_TX_OK; | |
906 | ||
907 | tx_error_icmp: | |
908 | dst_link_failure(skb); | |
909 | tx_error: | |
910 | dev->stats.tx_errors++; | |
911 | dev_kfree_skb(skb); | |
912 | return NETDEV_TX_OK; | |
913 | } | |
914 | ||
915 | static void ipip6_tunnel_bind_dev(struct net_device *dev) | |
916 | { | |
917 | struct net_device *tdev = NULL; | |
918 | struct ip_tunnel *tunnel; | |
919 | const struct iphdr *iph; | |
920 | struct flowi4 fl4; | |
921 | ||
922 | tunnel = netdev_priv(dev); | |
923 | iph = &tunnel->parms.iph; | |
924 | ||
925 | if (iph->daddr) { | |
926 | struct rtable *rt = ip_route_output_ports(dev_net(dev), &fl4, NULL, | |
927 | iph->daddr, iph->saddr, | |
928 | 0, 0, | |
929 | IPPROTO_IPV6, | |
930 | RT_TOS(iph->tos), | |
931 | tunnel->parms.link); | |
932 | ||
933 | if (!IS_ERR(rt)) { | |
934 | tdev = rt->dst.dev; | |
935 | ip_rt_put(rt); | |
936 | } | |
937 | dev->flags |= IFF_POINTOPOINT; | |
938 | } | |
939 | ||
940 | if (!tdev && tunnel->parms.link) | |
941 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); | |
942 | ||
943 | if (tdev) { | |
944 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); | |
945 | dev->mtu = tdev->mtu - sizeof(struct iphdr); | |
946 | if (dev->mtu < IPV6_MIN_MTU) | |
947 | dev->mtu = IPV6_MIN_MTU; | |
948 | } | |
949 | dev->iflink = tunnel->parms.link; | |
950 | } | |
951 | ||
952 | static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p) | |
953 | { | |
954 | struct net *net = dev_net(t->dev); | |
955 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
956 | ||
957 | ipip6_tunnel_unlink(sitn, t); | |
958 | synchronize_net(); | |
959 | t->parms.iph.saddr = p->iph.saddr; | |
960 | t->parms.iph.daddr = p->iph.daddr; | |
961 | memcpy(t->dev->dev_addr, &p->iph.saddr, 4); | |
962 | memcpy(t->dev->broadcast, &p->iph.daddr, 4); | |
963 | ipip6_tunnel_link(sitn, t); | |
964 | t->parms.iph.ttl = p->iph.ttl; | |
965 | t->parms.iph.tos = p->iph.tos; | |
966 | if (t->parms.link != p->link) { | |
967 | t->parms.link = p->link; | |
968 | ipip6_tunnel_bind_dev(t->dev); | |
969 | } | |
970 | netdev_state_change(t->dev); | |
971 | } | |
972 | ||
973 | #ifdef CONFIG_IPV6_SIT_6RD | |
974 | static int ipip6_tunnel_update_6rd(struct ip_tunnel *t, | |
975 | struct ip_tunnel_6rd *ip6rd) | |
976 | { | |
977 | struct in6_addr prefix; | |
978 | __be32 relay_prefix; | |
979 | ||
980 | if (ip6rd->relay_prefixlen > 32 || | |
981 | ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64) | |
982 | return -EINVAL; | |
983 | ||
984 | ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen); | |
985 | if (!ipv6_addr_equal(&prefix, &ip6rd->prefix)) | |
986 | return -EINVAL; | |
987 | if (ip6rd->relay_prefixlen) | |
988 | relay_prefix = ip6rd->relay_prefix & | |
989 | htonl(0xffffffffUL << | |
990 | (32 - ip6rd->relay_prefixlen)); | |
991 | else | |
992 | relay_prefix = 0; | |
993 | if (relay_prefix != ip6rd->relay_prefix) | |
994 | return -EINVAL; | |
995 | ||
996 | t->ip6rd.prefix = prefix; | |
997 | t->ip6rd.relay_prefix = relay_prefix; | |
998 | t->ip6rd.prefixlen = ip6rd->prefixlen; | |
999 | t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen; | |
1000 | netdev_state_change(t->dev); | |
1001 | return 0; | |
1002 | } | |
1003 | #endif | |
1004 | ||
1005 | static int | |
1006 | ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
1007 | { | |
1008 | int err = 0; | |
1009 | struct ip_tunnel_parm p; | |
1010 | struct ip_tunnel_prl prl; | |
1011 | struct ip_tunnel *t; | |
1012 | struct net *net = dev_net(dev); | |
1013 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1014 | #ifdef CONFIG_IPV6_SIT_6RD | |
1015 | struct ip_tunnel_6rd ip6rd; | |
1016 | #endif | |
1017 | ||
1018 | switch (cmd) { | |
1019 | case SIOCGETTUNNEL: | |
1020 | #ifdef CONFIG_IPV6_SIT_6RD | |
1021 | case SIOCGET6RD: | |
1022 | #endif | |
1023 | t = NULL; | |
1024 | if (dev == sitn->fb_tunnel_dev) { | |
1025 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { | |
1026 | err = -EFAULT; | |
1027 | break; | |
1028 | } | |
1029 | t = ipip6_tunnel_locate(net, &p, 0); | |
1030 | } | |
1031 | if (t == NULL) | |
1032 | t = netdev_priv(dev); | |
1033 | ||
1034 | err = -EFAULT; | |
1035 | if (cmd == SIOCGETTUNNEL) { | |
1036 | memcpy(&p, &t->parms, sizeof(p)); | |
1037 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, | |
1038 | sizeof(p))) | |
1039 | goto done; | |
1040 | #ifdef CONFIG_IPV6_SIT_6RD | |
1041 | } else { | |
1042 | ip6rd.prefix = t->ip6rd.prefix; | |
1043 | ip6rd.relay_prefix = t->ip6rd.relay_prefix; | |
1044 | ip6rd.prefixlen = t->ip6rd.prefixlen; | |
1045 | ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; | |
1046 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd, | |
1047 | sizeof(ip6rd))) | |
1048 | goto done; | |
1049 | #endif | |
1050 | } | |
1051 | err = 0; | |
1052 | break; | |
1053 | ||
1054 | case SIOCADDTUNNEL: | |
1055 | case SIOCCHGTUNNEL: | |
1056 | err = -EPERM; | |
1057 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
1058 | goto done; | |
1059 | ||
1060 | err = -EFAULT; | |
1061 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1062 | goto done; | |
1063 | ||
1064 | err = -EINVAL; | |
1065 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 || | |
1066 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) | |
1067 | goto done; | |
1068 | if (p.iph.ttl) | |
1069 | p.iph.frag_off |= htons(IP_DF); | |
1070 | ||
1071 | t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); | |
1072 | ||
1073 | if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { | |
1074 | if (t != NULL) { | |
1075 | if (t->dev != dev) { | |
1076 | err = -EEXIST; | |
1077 | break; | |
1078 | } | |
1079 | } else { | |
1080 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || | |
1081 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { | |
1082 | err = -EINVAL; | |
1083 | break; | |
1084 | } | |
1085 | t = netdev_priv(dev); | |
1086 | } | |
1087 | ||
1088 | ipip6_tunnel_update(t, &p); | |
1089 | } | |
1090 | ||
1091 | if (t) { | |
1092 | err = 0; | |
1093 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) | |
1094 | err = -EFAULT; | |
1095 | } else | |
1096 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1097 | break; | |
1098 | ||
1099 | case SIOCDELTUNNEL: | |
1100 | err = -EPERM; | |
1101 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
1102 | goto done; | |
1103 | ||
1104 | if (dev == sitn->fb_tunnel_dev) { | |
1105 | err = -EFAULT; | |
1106 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1107 | goto done; | |
1108 | err = -ENOENT; | |
1109 | if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL) | |
1110 | goto done; | |
1111 | err = -EPERM; | |
1112 | if (t == netdev_priv(sitn->fb_tunnel_dev)) | |
1113 | goto done; | |
1114 | dev = t->dev; | |
1115 | } | |
1116 | unregister_netdevice(dev); | |
1117 | err = 0; | |
1118 | break; | |
1119 | ||
1120 | case SIOCGETPRL: | |
1121 | err = -EINVAL; | |
1122 | if (dev == sitn->fb_tunnel_dev) | |
1123 | goto done; | |
1124 | err = -ENOENT; | |
1125 | if (!(t = netdev_priv(dev))) | |
1126 | goto done; | |
1127 | err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data); | |
1128 | break; | |
1129 | ||
1130 | case SIOCADDPRL: | |
1131 | case SIOCDELPRL: | |
1132 | case SIOCCHGPRL: | |
1133 | err = -EPERM; | |
1134 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
1135 | goto done; | |
1136 | err = -EINVAL; | |
1137 | if (dev == sitn->fb_tunnel_dev) | |
1138 | goto done; | |
1139 | err = -EFAULT; | |
1140 | if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) | |
1141 | goto done; | |
1142 | err = -ENOENT; | |
1143 | if (!(t = netdev_priv(dev))) | |
1144 | goto done; | |
1145 | ||
1146 | switch (cmd) { | |
1147 | case SIOCDELPRL: | |
1148 | err = ipip6_tunnel_del_prl(t, &prl); | |
1149 | break; | |
1150 | case SIOCADDPRL: | |
1151 | case SIOCCHGPRL: | |
1152 | err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); | |
1153 | break; | |
1154 | } | |
1155 | netdev_state_change(dev); | |
1156 | break; | |
1157 | ||
1158 | #ifdef CONFIG_IPV6_SIT_6RD | |
1159 | case SIOCADD6RD: | |
1160 | case SIOCCHG6RD: | |
1161 | case SIOCDEL6RD: | |
1162 | err = -EPERM; | |
1163 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
1164 | goto done; | |
1165 | ||
1166 | err = -EFAULT; | |
1167 | if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data, | |
1168 | sizeof(ip6rd))) | |
1169 | goto done; | |
1170 | ||
1171 | t = netdev_priv(dev); | |
1172 | ||
1173 | if (cmd != SIOCDEL6RD) { | |
1174 | err = ipip6_tunnel_update_6rd(t, &ip6rd); | |
1175 | if (err < 0) | |
1176 | goto done; | |
1177 | } else | |
1178 | ipip6_tunnel_clone_6rd(dev, sitn); | |
1179 | ||
1180 | err = 0; | |
1181 | break; | |
1182 | #endif | |
1183 | ||
1184 | default: | |
1185 | err = -EINVAL; | |
1186 | } | |
1187 | ||
1188 | done: | |
1189 | return err; | |
1190 | } | |
1191 | ||
1192 | static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu) | |
1193 | { | |
1194 | if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr)) | |
1195 | return -EINVAL; | |
1196 | dev->mtu = new_mtu; | |
1197 | return 0; | |
1198 | } | |
1199 | ||
1200 | static const struct net_device_ops ipip6_netdev_ops = { | |
1201 | .ndo_uninit = ipip6_tunnel_uninit, | |
1202 | .ndo_start_xmit = ipip6_tunnel_xmit, | |
1203 | .ndo_do_ioctl = ipip6_tunnel_ioctl, | |
1204 | .ndo_change_mtu = ipip6_tunnel_change_mtu, | |
1205 | .ndo_get_stats64= ipip6_get_stats64, | |
1206 | }; | |
1207 | ||
1208 | static void ipip6_dev_free(struct net_device *dev) | |
1209 | { | |
1210 | free_percpu(dev->tstats); | |
1211 | free_netdev(dev); | |
1212 | } | |
1213 | ||
1214 | static void ipip6_tunnel_setup(struct net_device *dev) | |
1215 | { | |
1216 | dev->netdev_ops = &ipip6_netdev_ops; | |
1217 | dev->destructor = ipip6_dev_free; | |
1218 | ||
1219 | dev->type = ARPHRD_SIT; | |
1220 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); | |
1221 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); | |
1222 | dev->flags = IFF_NOARP; | |
1223 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; | |
1224 | dev->iflink = 0; | |
1225 | dev->addr_len = 4; | |
1226 | dev->features |= NETIF_F_NETNS_LOCAL; | |
1227 | dev->features |= NETIF_F_LLTX; | |
1228 | } | |
1229 | ||
1230 | static int ipip6_tunnel_init(struct net_device *dev) | |
1231 | { | |
1232 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1233 | ||
1234 | tunnel->dev = dev; | |
1235 | ||
1236 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
1237 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
1238 | ||
1239 | ipip6_tunnel_bind_dev(dev); | |
1240 | dev->tstats = alloc_percpu(struct pcpu_tstats); | |
1241 | if (!dev->tstats) | |
1242 | return -ENOMEM; | |
1243 | ||
1244 | return 0; | |
1245 | } | |
1246 | ||
1247 | static int __net_init ipip6_fb_tunnel_init(struct net_device *dev) | |
1248 | { | |
1249 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1250 | struct iphdr *iph = &tunnel->parms.iph; | |
1251 | struct net *net = dev_net(dev); | |
1252 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1253 | ||
1254 | tunnel->dev = dev; | |
1255 | strcpy(tunnel->parms.name, dev->name); | |
1256 | ||
1257 | iph->version = 4; | |
1258 | iph->protocol = IPPROTO_IPV6; | |
1259 | iph->ihl = 5; | |
1260 | iph->ttl = 64; | |
1261 | ||
1262 | dev->tstats = alloc_percpu(struct pcpu_tstats); | |
1263 | if (!dev->tstats) | |
1264 | return -ENOMEM; | |
1265 | dev_hold(dev); | |
1266 | rcu_assign_pointer(sitn->tunnels_wc[0], tunnel); | |
1267 | return 0; | |
1268 | } | |
1269 | ||
1270 | static void ipip6_netlink_parms(struct nlattr *data[], | |
1271 | struct ip_tunnel_parm *parms) | |
1272 | { | |
1273 | memset(parms, 0, sizeof(*parms)); | |
1274 | ||
1275 | parms->iph.version = 4; | |
1276 | parms->iph.protocol = IPPROTO_IPV6; | |
1277 | parms->iph.ihl = 5; | |
1278 | parms->iph.ttl = 64; | |
1279 | ||
1280 | if (!data) | |
1281 | return; | |
1282 | ||
1283 | if (data[IFLA_IPTUN_LINK]) | |
1284 | parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); | |
1285 | ||
1286 | if (data[IFLA_IPTUN_LOCAL]) | |
1287 | parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]); | |
1288 | ||
1289 | if (data[IFLA_IPTUN_REMOTE]) | |
1290 | parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]); | |
1291 | ||
1292 | if (data[IFLA_IPTUN_TTL]) { | |
1293 | parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]); | |
1294 | if (parms->iph.ttl) | |
1295 | parms->iph.frag_off = htons(IP_DF); | |
1296 | } | |
1297 | ||
1298 | if (data[IFLA_IPTUN_TOS]) | |
1299 | parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]); | |
1300 | ||
1301 | if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC])) | |
1302 | parms->iph.frag_off = htons(IP_DF); | |
1303 | ||
1304 | if (data[IFLA_IPTUN_FLAGS]) | |
1305 | parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]); | |
1306 | } | |
1307 | ||
1308 | #ifdef CONFIG_IPV6_SIT_6RD | |
1309 | /* This function returns true when 6RD attributes are present in the nl msg */ | |
1310 | static bool ipip6_netlink_6rd_parms(struct nlattr *data[], | |
1311 | struct ip_tunnel_6rd *ip6rd) | |
1312 | { | |
1313 | bool ret = false; | |
1314 | memset(ip6rd, 0, sizeof(*ip6rd)); | |
1315 | ||
1316 | if (!data) | |
1317 | return ret; | |
1318 | ||
1319 | if (data[IFLA_IPTUN_6RD_PREFIX]) { | |
1320 | ret = true; | |
1321 | nla_memcpy(&ip6rd->prefix, data[IFLA_IPTUN_6RD_PREFIX], | |
1322 | sizeof(struct in6_addr)); | |
1323 | } | |
1324 | ||
1325 | if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) { | |
1326 | ret = true; | |
1327 | ip6rd->relay_prefix = | |
1328 | nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]); | |
1329 | } | |
1330 | ||
1331 | if (data[IFLA_IPTUN_6RD_PREFIXLEN]) { | |
1332 | ret = true; | |
1333 | ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]); | |
1334 | } | |
1335 | ||
1336 | if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) { | |
1337 | ret = true; | |
1338 | ip6rd->relay_prefixlen = | |
1339 | nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]); | |
1340 | } | |
1341 | ||
1342 | return ret; | |
1343 | } | |
1344 | #endif | |
1345 | ||
1346 | static int ipip6_newlink(struct net *src_net, struct net_device *dev, | |
1347 | struct nlattr *tb[], struct nlattr *data[]) | |
1348 | { | |
1349 | struct net *net = dev_net(dev); | |
1350 | struct ip_tunnel *nt; | |
1351 | #ifdef CONFIG_IPV6_SIT_6RD | |
1352 | struct ip_tunnel_6rd ip6rd; | |
1353 | #endif | |
1354 | int err; | |
1355 | ||
1356 | nt = netdev_priv(dev); | |
1357 | ipip6_netlink_parms(data, &nt->parms); | |
1358 | ||
1359 | if (ipip6_tunnel_locate(net, &nt->parms, 0)) | |
1360 | return -EEXIST; | |
1361 | ||
1362 | err = ipip6_tunnel_create(dev); | |
1363 | if (err < 0) | |
1364 | return err; | |
1365 | ||
1366 | #ifdef CONFIG_IPV6_SIT_6RD | |
1367 | if (ipip6_netlink_6rd_parms(data, &ip6rd)) | |
1368 | err = ipip6_tunnel_update_6rd(nt, &ip6rd); | |
1369 | #endif | |
1370 | ||
1371 | return err; | |
1372 | } | |
1373 | ||
1374 | static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[], | |
1375 | struct nlattr *data[]) | |
1376 | { | |
1377 | struct ip_tunnel *t; | |
1378 | struct ip_tunnel_parm p; | |
1379 | struct net *net = dev_net(dev); | |
1380 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1381 | #ifdef CONFIG_IPV6_SIT_6RD | |
1382 | struct ip_tunnel_6rd ip6rd; | |
1383 | #endif | |
1384 | ||
1385 | if (dev == sitn->fb_tunnel_dev) | |
1386 | return -EINVAL; | |
1387 | ||
1388 | ipip6_netlink_parms(data, &p); | |
1389 | ||
1390 | if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || | |
1391 | (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) | |
1392 | return -EINVAL; | |
1393 | ||
1394 | t = ipip6_tunnel_locate(net, &p, 0); | |
1395 | ||
1396 | if (t) { | |
1397 | if (t->dev != dev) | |
1398 | return -EEXIST; | |
1399 | } else | |
1400 | t = netdev_priv(dev); | |
1401 | ||
1402 | ipip6_tunnel_update(t, &p); | |
1403 | ||
1404 | #ifdef CONFIG_IPV6_SIT_6RD | |
1405 | if (ipip6_netlink_6rd_parms(data, &ip6rd)) | |
1406 | return ipip6_tunnel_update_6rd(t, &ip6rd); | |
1407 | #endif | |
1408 | ||
1409 | return 0; | |
1410 | } | |
1411 | ||
1412 | static size_t ipip6_get_size(const struct net_device *dev) | |
1413 | { | |
1414 | return | |
1415 | /* IFLA_IPTUN_LINK */ | |
1416 | nla_total_size(4) + | |
1417 | /* IFLA_IPTUN_LOCAL */ | |
1418 | nla_total_size(4) + | |
1419 | /* IFLA_IPTUN_REMOTE */ | |
1420 | nla_total_size(4) + | |
1421 | /* IFLA_IPTUN_TTL */ | |
1422 | nla_total_size(1) + | |
1423 | /* IFLA_IPTUN_TOS */ | |
1424 | nla_total_size(1) + | |
1425 | /* IFLA_IPTUN_PMTUDISC */ | |
1426 | nla_total_size(1) + | |
1427 | /* IFLA_IPTUN_FLAGS */ | |
1428 | nla_total_size(2) + | |
1429 | #ifdef CONFIG_IPV6_SIT_6RD | |
1430 | /* IFLA_IPTUN_6RD_PREFIX */ | |
1431 | nla_total_size(sizeof(struct in6_addr)) + | |
1432 | /* IFLA_IPTUN_6RD_RELAY_PREFIX */ | |
1433 | nla_total_size(4) + | |
1434 | /* IFLA_IPTUN_6RD_PREFIXLEN */ | |
1435 | nla_total_size(2) + | |
1436 | /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */ | |
1437 | nla_total_size(2) + | |
1438 | #endif | |
1439 | 0; | |
1440 | } | |
1441 | ||
1442 | static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
1443 | { | |
1444 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1445 | struct ip_tunnel_parm *parm = &tunnel->parms; | |
1446 | ||
1447 | if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || | |
1448 | nla_put_be32(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || | |
1449 | nla_put_be32(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || | |
1450 | nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || | |
1451 | nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || | |
1452 | nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, | |
1453 | !!(parm->iph.frag_off & htons(IP_DF))) || | |
1454 | nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags)) | |
1455 | goto nla_put_failure; | |
1456 | ||
1457 | #ifdef CONFIG_IPV6_SIT_6RD | |
1458 | if (nla_put(skb, IFLA_IPTUN_6RD_PREFIX, sizeof(struct in6_addr), | |
1459 | &tunnel->ip6rd.prefix) || | |
1460 | nla_put_be32(skb, IFLA_IPTUN_6RD_RELAY_PREFIX, | |
1461 | tunnel->ip6rd.relay_prefix) || | |
1462 | nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN, | |
1463 | tunnel->ip6rd.prefixlen) || | |
1464 | nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN, | |
1465 | tunnel->ip6rd.relay_prefixlen)) | |
1466 | goto nla_put_failure; | |
1467 | #endif | |
1468 | ||
1469 | return 0; | |
1470 | ||
1471 | nla_put_failure: | |
1472 | return -EMSGSIZE; | |
1473 | } | |
1474 | ||
1475 | static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = { | |
1476 | [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, | |
1477 | [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, | |
1478 | [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, | |
1479 | [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, | |
1480 | [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, | |
1481 | [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, | |
1482 | [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 }, | |
1483 | #ifdef CONFIG_IPV6_SIT_6RD | |
1484 | [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) }, | |
1485 | [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 }, | |
1486 | [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 }, | |
1487 | [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 }, | |
1488 | #endif | |
1489 | }; | |
1490 | ||
1491 | static struct rtnl_link_ops sit_link_ops __read_mostly = { | |
1492 | .kind = "sit", | |
1493 | .maxtype = IFLA_IPTUN_MAX, | |
1494 | .policy = ipip6_policy, | |
1495 | .priv_size = sizeof(struct ip_tunnel), | |
1496 | .setup = ipip6_tunnel_setup, | |
1497 | .newlink = ipip6_newlink, | |
1498 | .changelink = ipip6_changelink, | |
1499 | .get_size = ipip6_get_size, | |
1500 | .fill_info = ipip6_fill_info, | |
1501 | }; | |
1502 | ||
1503 | static struct xfrm_tunnel sit_handler __read_mostly = { | |
1504 | .handler = ipip6_rcv, | |
1505 | .err_handler = ipip6_err, | |
1506 | .priority = 1, | |
1507 | }; | |
1508 | ||
1509 | static void __net_exit sit_destroy_tunnels(struct sit_net *sitn, struct list_head *head) | |
1510 | { | |
1511 | int prio; | |
1512 | ||
1513 | for (prio = 1; prio < 4; prio++) { | |
1514 | int h; | |
1515 | for (h = 0; h < HASH_SIZE; h++) { | |
1516 | struct ip_tunnel *t; | |
1517 | ||
1518 | t = rtnl_dereference(sitn->tunnels[prio][h]); | |
1519 | while (t != NULL) { | |
1520 | unregister_netdevice_queue(t->dev, head); | |
1521 | t = rtnl_dereference(t->next); | |
1522 | } | |
1523 | } | |
1524 | } | |
1525 | } | |
1526 | ||
1527 | static int __net_init sit_init_net(struct net *net) | |
1528 | { | |
1529 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1530 | struct ip_tunnel *t; | |
1531 | int err; | |
1532 | ||
1533 | sitn->tunnels[0] = sitn->tunnels_wc; | |
1534 | sitn->tunnels[1] = sitn->tunnels_l; | |
1535 | sitn->tunnels[2] = sitn->tunnels_r; | |
1536 | sitn->tunnels[3] = sitn->tunnels_r_l; | |
1537 | ||
1538 | sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", | |
1539 | ipip6_tunnel_setup); | |
1540 | if (!sitn->fb_tunnel_dev) { | |
1541 | err = -ENOMEM; | |
1542 | goto err_alloc_dev; | |
1543 | } | |
1544 | dev_net_set(sitn->fb_tunnel_dev, net); | |
1545 | ||
1546 | err = ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); | |
1547 | if (err) | |
1548 | goto err_dev_free; | |
1549 | ||
1550 | ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); | |
1551 | ||
1552 | if ((err = register_netdev(sitn->fb_tunnel_dev))) | |
1553 | goto err_reg_dev; | |
1554 | ||
1555 | t = netdev_priv(sitn->fb_tunnel_dev); | |
1556 | ||
1557 | strcpy(t->parms.name, sitn->fb_tunnel_dev->name); | |
1558 | return 0; | |
1559 | ||
1560 | err_reg_dev: | |
1561 | dev_put(sitn->fb_tunnel_dev); | |
1562 | err_dev_free: | |
1563 | ipip6_dev_free(sitn->fb_tunnel_dev); | |
1564 | err_alloc_dev: | |
1565 | return err; | |
1566 | } | |
1567 | ||
1568 | static void __net_exit sit_exit_net(struct net *net) | |
1569 | { | |
1570 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1571 | LIST_HEAD(list); | |
1572 | ||
1573 | rtnl_lock(); | |
1574 | sit_destroy_tunnels(sitn, &list); | |
1575 | unregister_netdevice_queue(sitn->fb_tunnel_dev, &list); | |
1576 | unregister_netdevice_many(&list); | |
1577 | rtnl_unlock(); | |
1578 | } | |
1579 | ||
1580 | static struct pernet_operations sit_net_ops = { | |
1581 | .init = sit_init_net, | |
1582 | .exit = sit_exit_net, | |
1583 | .id = &sit_net_id, | |
1584 | .size = sizeof(struct sit_net), | |
1585 | }; | |
1586 | ||
1587 | static void __exit sit_cleanup(void) | |
1588 | { | |
1589 | rtnl_link_unregister(&sit_link_ops); | |
1590 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); | |
1591 | ||
1592 | unregister_pernet_device(&sit_net_ops); | |
1593 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ | |
1594 | } | |
1595 | ||
1596 | static int __init sit_init(void) | |
1597 | { | |
1598 | int err; | |
1599 | ||
1600 | pr_info("IPv6 over IPv4 tunneling driver\n"); | |
1601 | ||
1602 | err = register_pernet_device(&sit_net_ops); | |
1603 | if (err < 0) | |
1604 | return err; | |
1605 | err = xfrm4_tunnel_register(&sit_handler, AF_INET6); | |
1606 | if (err < 0) { | |
1607 | pr_info("%s: can't add protocol\n", __func__); | |
1608 | goto xfrm_tunnel_failed; | |
1609 | } | |
1610 | err = rtnl_link_register(&sit_link_ops); | |
1611 | if (err < 0) | |
1612 | goto rtnl_link_failed; | |
1613 | ||
1614 | out: | |
1615 | return err; | |
1616 | ||
1617 | rtnl_link_failed: | |
1618 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); | |
1619 | xfrm_tunnel_failed: | |
1620 | unregister_pernet_device(&sit_net_ops); | |
1621 | goto out; | |
1622 | } | |
1623 | ||
1624 | module_init(sit_init); | |
1625 | module_exit(sit_cleanup); | |
1626 | MODULE_LICENSE("GPL"); | |
1627 | MODULE_ALIAS_NETDEV("sit0"); |