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Merge branch 'for-3.13-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj...
[linux/fpc-iii.git] / net / ipv6 / sit.c
blob366fbba3359ab790e1b22917931acdbdb1daebf3
1 /*
2 * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT)
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 *
14 * Changes:
15 * Roger Venning <r.venning@telstra.com>: 6to4 support
16 * Nate Thompson <nate@thebog.net>: 6to4 support
17 * Fred Templin <fred.l.templin@boeing.com>: isatap support
18 */
19
20 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
21
22 #include <linux/module.h>
23 #include <linux/capability.h>
24 #include <linux/errno.h>
25 #include <linux/types.h>
26 #include <linux/socket.h>
27 #include <linux/sockios.h>
28 #include <linux/net.h>
29 #include <linux/in6.h>
30 #include <linux/netdevice.h>
31 #include <linux/if_arp.h>
32 #include <linux/icmp.h>
33 #include <linux/slab.h>
34 #include <asm/uaccess.h>
35 #include <linux/init.h>
36 #include <linux/netfilter_ipv4.h>
37 #include <linux/if_ether.h>
38
39 #include <net/sock.h>
40 #include <net/snmp.h>
41
42 #include <net/ipv6.h>
43 #include <net/protocol.h>
44 #include <net/transp_v6.h>
45 #include <net/ip6_fib.h>
46 #include <net/ip6_route.h>
47 #include <net/ndisc.h>
48 #include <net/addrconf.h>
49 #include <net/ip.h>
50 #include <net/udp.h>
51 #include <net/icmp.h>
52 #include <net/ip_tunnels.h>
53 #include <net/inet_ecn.h>
54 #include <net/xfrm.h>
55 #include <net/dsfield.h>
56 #include <net/net_namespace.h>
57 #include <net/netns/generic.h>
58
59 /*
60 This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c
61
62 For comments look at net/ipv4/ip_gre.c --ANK
63 */
64
65 #define HASH_SIZE 16
66 #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)
67
68 static bool log_ecn_error = true;
69 module_param(log_ecn_error, bool, 0644);
70 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
71
72 static int ipip6_tunnel_init(struct net_device *dev);
73 static void ipip6_tunnel_setup(struct net_device *dev);
74 static void ipip6_dev_free(struct net_device *dev);
75 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst,
76 __be32 *v4dst);
77 static struct rtnl_link_ops sit_link_ops __read_mostly;
78
79 static int sit_net_id __read_mostly;
80 struct sit_net {
81 struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE];
82 struct ip_tunnel __rcu *tunnels_r[HASH_SIZE];
83 struct ip_tunnel __rcu *tunnels_l[HASH_SIZE];
84 struct ip_tunnel __rcu *tunnels_wc[1];
85 struct ip_tunnel __rcu **tunnels[4];
86
87 struct net_device *fb_tunnel_dev;
88 };
89
90 /*
91 * Must be invoked with rcu_read_lock
92 */
93 static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net,
94 struct net_device *dev, __be32 remote, __be32 local)
95 {
96 unsigned int h0 = HASH(remote);
97 unsigned int h1 = HASH(local);
98 struct ip_tunnel *t;
99 struct sit_net *sitn = net_generic(net, sit_net_id);
100
101 for_each_ip_tunnel_rcu(t, sitn->tunnels_r_l[h0 ^ h1]) {
102 if (local == t->parms.iph.saddr &&
103 remote == t->parms.iph.daddr &&
104 (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
105 (t->dev->flags & IFF_UP))
106 return t;
107 }
108 for_each_ip_tunnel_rcu(t, sitn->tunnels_r[h0]) {
109 if (remote == t->parms.iph.daddr &&
110 (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
111 (t->dev->flags & IFF_UP))
112 return t;
113 }
114 for_each_ip_tunnel_rcu(t, sitn->tunnels_l[h1]) {
115 if (local == t->parms.iph.saddr &&
116 (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
117 (t->dev->flags & IFF_UP))
118 return t;
119 }
120 t = rcu_dereference(sitn->tunnels_wc[0]);
121 if ((t != NULL) && (t->dev->flags & IFF_UP))
122 return t;
123 return NULL;
124 }
125
126 static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn,
127 struct ip_tunnel_parm *parms)
128 {
129 __be32 remote = parms->iph.daddr;
130 __be32 local = parms->iph.saddr;
131 unsigned int h = 0;
132 int prio = 0;
133
134 if (remote) {
135 prio |= 2;
136 h ^= HASH(remote);
137 }
138 if (local) {
139 prio |= 1;
140 h ^= HASH(local);
141 }
142 return &sitn->tunnels[prio][h];
143 }
144
145 static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn,
146 struct ip_tunnel *t)
147 {
148 return __ipip6_bucket(sitn, &t->parms);
149 }
150
151 static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t)
152 {
153 struct ip_tunnel __rcu **tp;
154 struct ip_tunnel *iter;
155
156 for (tp = ipip6_bucket(sitn, t);
157 (iter = rtnl_dereference(*tp)) != NULL;
158 tp = &iter->next) {
159 if (t == iter) {
160 rcu_assign_pointer(*tp, t->next);
161 break;
162 }
163 }
164 }
165
166 static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t)
167 {
168 struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t);
169
170 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
171 rcu_assign_pointer(*tp, t);
172 }
173
174 static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn)
175 {
176 #ifdef CONFIG_IPV6_SIT_6RD
177 struct ip_tunnel *t = netdev_priv(dev);
178
179 if (t->dev == sitn->fb_tunnel_dev) {
180 ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0);
181 t->ip6rd.relay_prefix = 0;
182 t->ip6rd.prefixlen = 16;
183 t->ip6rd.relay_prefixlen = 0;
184 } else {
185 struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev);
186 memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd));
187 }
188 #endif
189 }
190
191 static int ipip6_tunnel_create(struct net_device *dev)
192 {
193 struct ip_tunnel *t = netdev_priv(dev);
194 struct net *net = dev_net(dev);
195 struct sit_net *sitn = net_generic(net, sit_net_id);
196 int err;
197
198 err = ipip6_tunnel_init(dev);
199 if (err < 0)
200 goto out;
201 ipip6_tunnel_clone_6rd(dev, sitn);
202
203 if ((__force u16)t->parms.i_flags & SIT_ISATAP)
204 dev->priv_flags |= IFF_ISATAP;
205
206 err = register_netdevice(dev);
207 if (err < 0)
208 goto out;
209
210 strcpy(t->parms.name, dev->name);
211 dev->rtnl_link_ops = &sit_link_ops;
212
213 dev_hold(dev);
214
215 ipip6_tunnel_link(sitn, t);
216 return 0;
217
218 out:
219 return err;
220 }
221
222 static struct ip_tunnel *ipip6_tunnel_locate(struct net *net,
223 struct ip_tunnel_parm *parms, int create)
224 {
225 __be32 remote = parms->iph.daddr;
226 __be32 local = parms->iph.saddr;
227 struct ip_tunnel *t, *nt;
228 struct ip_tunnel __rcu **tp;
229 struct net_device *dev;
230 char name[IFNAMSIZ];
231 struct sit_net *sitn = net_generic(net, sit_net_id);
232
233 for (tp = __ipip6_bucket(sitn, parms);
234 (t = rtnl_dereference(*tp)) != NULL;
235 tp = &t->next) {
236 if (local == t->parms.iph.saddr &&
237 remote == t->parms.iph.daddr &&
238 parms->link == t->parms.link) {
239 if (create)
240 return NULL;
241 else
242 return t;
243 }
244 }
245 if (!create)
246 goto failed;
247
248 if (parms->name[0])
249 strlcpy(name, parms->name, IFNAMSIZ);
250 else
251 strcpy(name, "sit%d");
252
253 dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup);
254 if (dev == NULL)
255 return NULL;
256
257 dev_net_set(dev, net);
258
259 nt = netdev_priv(dev);
260
261 nt->parms = *parms;
262 if (ipip6_tunnel_create(dev) < 0)
263 goto failed_free;
264
265 return nt;
266
267 failed_free:
268 ipip6_dev_free(dev);
269 failed:
270 return NULL;
271 }
272
273 #define for_each_prl_rcu(start) \
274 for (prl = rcu_dereference(start); \
275 prl; \
276 prl = rcu_dereference(prl->next))
277
278 static struct ip_tunnel_prl_entry *
279 __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr)
280 {
281 struct ip_tunnel_prl_entry *prl;
282
283 for_each_prl_rcu(t->prl)
284 if (prl->addr == addr)
285 break;
286 return prl;
287
288 }
289
290 static int ipip6_tunnel_get_prl(struct ip_tunnel *t,
291 struct ip_tunnel_prl __user *a)
292 {
293 struct ip_tunnel_prl kprl, *kp;
294 struct ip_tunnel_prl_entry *prl;
295 unsigned int cmax, c = 0, ca, len;
296 int ret = 0;
297
298 if (copy_from_user(&kprl, a, sizeof(kprl)))
299 return -EFAULT;
300 cmax = kprl.datalen / sizeof(kprl);
301 if (cmax > 1 && kprl.addr != htonl(INADDR_ANY))
302 cmax = 1;
303
304 /* For simple GET or for root users,
305 * we try harder to allocate.
306 */
307 kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ?
308 kcalloc(cmax, sizeof(*kp), GFP_KERNEL) :
309 NULL;
310
311 rcu_read_lock();
312
313 ca = t->prl_count < cmax ? t->prl_count : cmax;
314
315 if (!kp) {
316 /* We don't try hard to allocate much memory for
317 * non-root users.
318 * For root users, retry allocating enough memory for
319 * the answer.
320 */
321 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC);
322 if (!kp) {
323 ret = -ENOMEM;
324 goto out;
325 }
326 }
327
328 c = 0;
329 for_each_prl_rcu(t->prl) {
330 if (c >= cmax)
331 break;
332 if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr)
333 continue;
334 kp[c].addr = prl->addr;
335 kp[c].flags = prl->flags;
336 c++;
337 if (kprl.addr != htonl(INADDR_ANY))
338 break;
339 }
340 out:
341 rcu_read_unlock();
342
343 len = sizeof(*kp) * c;
344 ret = 0;
345 if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen))
346 ret = -EFAULT;
347
348 kfree(kp);
349
350 return ret;
351 }
352
353 static int
354 ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg)
355 {
356 struct ip_tunnel_prl_entry *p;
357 int err = 0;
358
359 if (a->addr == htonl(INADDR_ANY))
360 return -EINVAL;
361
362 ASSERT_RTNL();
363
364 for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) {
365 if (p->addr == a->addr) {
366 if (chg) {
367 p->flags = a->flags;
368 goto out;
369 }
370 err = -EEXIST;
371 goto out;
372 }
373 }
374
375 if (chg) {
376 err = -ENXIO;
377 goto out;
378 }
379
380 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL);
381 if (!p) {
382 err = -ENOBUFS;
383 goto out;
384 }
385
386 p->next = t->prl;
387 p->addr = a->addr;
388 p->flags = a->flags;
389 t->prl_count++;
390 rcu_assign_pointer(t->prl, p);
391 out:
392 return err;
393 }
394
395 static void prl_list_destroy_rcu(struct rcu_head *head)
396 {
397 struct ip_tunnel_prl_entry *p, *n;
398
399 p = container_of(head, struct ip_tunnel_prl_entry, rcu_head);
400 do {
401 n = rcu_dereference_protected(p->next, 1);
402 kfree(p);
403 p = n;
404 } while (p);
405 }
406
407 static int
408 ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
409 {
410 struct ip_tunnel_prl_entry *x;
411 struct ip_tunnel_prl_entry __rcu **p;
412 int err = 0;
413
414 ASSERT_RTNL();
415
416 if (a && a->addr != htonl(INADDR_ANY)) {
417 for (p = &t->prl;
418 (x = rtnl_dereference(*p)) != NULL;
419 p = &x->next) {
420 if (x->addr == a->addr) {
421 *p = x->next;
422 kfree_rcu(x, rcu_head);
423 t->prl_count--;
424 goto out;
425 }
426 }
427 err = -ENXIO;
428 } else {
429 x = rtnl_dereference(t->prl);
430 if (x) {
431 t->prl_count = 0;
432 call_rcu(&x->rcu_head, prl_list_destroy_rcu);
433 t->prl = NULL;
434 }
435 }
436 out:
437 return err;
438 }
439
440 static int
441 isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t)
442 {
443 struct ip_tunnel_prl_entry *p;
444 int ok = 1;
445
446 rcu_read_lock();
447 p = __ipip6_tunnel_locate_prl(t, iph->saddr);
448 if (p) {
449 if (p->flags & PRL_DEFAULT)
450 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT;
451 else
452 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT;
453 } else {
454 const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr;
455
456 if (ipv6_addr_is_isatap(addr6) &&
457 (addr6->s6_addr32[3] == iph->saddr) &&
458 ipv6_chk_prefix(addr6, t->dev))
459 skb->ndisc_nodetype = NDISC_NODETYPE_HOST;
460 else
461 ok = 0;
462 }
463 rcu_read_unlock();
464 return ok;
465 }
466
467 static void ipip6_tunnel_uninit(struct net_device *dev)
468 {
469 struct ip_tunnel *tunnel = netdev_priv(dev);
470 struct sit_net *sitn = net_generic(tunnel->net, sit_net_id);
471
472 if (dev == sitn->fb_tunnel_dev) {
473 RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL);
474 } else {
475 ipip6_tunnel_unlink(sitn, tunnel);
476 ipip6_tunnel_del_prl(tunnel, NULL);
477 }
478 dev_put(dev);
479 }
480
481 /* Generate icmpv6 with type/code ICMPV6_DEST_UNREACH/ICMPV6_ADDR_UNREACH
482 * if sufficient data bytes are available
483 */
484 static int ipip6_err_gen_icmpv6_unreach(struct sk_buff *skb)
485 {
486 const struct iphdr *iph = (const struct iphdr *) skb->data;
487 struct rt6_info *rt;
488 struct sk_buff *skb2;
489
490 if (!pskb_may_pull(skb, iph->ihl * 4 + sizeof(struct ipv6hdr) + 8))
491 return 1;
492
493 skb2 = skb_clone(skb, GFP_ATOMIC);
494
495 if (!skb2)
496 return 1;
497
498 skb_dst_drop(skb2);
499 skb_pull(skb2, iph->ihl * 4);
500 skb_reset_network_header(skb2);
501
502 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, NULL, 0, 0);
503
504 if (rt && rt->dst.dev)
505 skb2->dev = rt->dst.dev;
506
507 icmpv6_send(skb2, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
508
509 if (rt)
510 ip6_rt_put(rt);
511
512 kfree_skb(skb2);
513
514 return 0;
515 }
516
517 static int ipip6_err(struct sk_buff *skb, u32 info)
518 {
519 const struct iphdr *iph = (const struct iphdr *)skb->data;
520 const int type = icmp_hdr(skb)->type;
521 const int code = icmp_hdr(skb)->code;
522 struct ip_tunnel *t;
523 int err;
524
525 switch (type) {
526 default:
527 case ICMP_PARAMETERPROB:
528 return 0;
529
530 case ICMP_DEST_UNREACH:
531 switch (code) {
532 case ICMP_SR_FAILED:
533 /* Impossible event. */
534 return 0;
535 default:
536 /* All others are translated to HOST_UNREACH.
537 rfc2003 contains "deep thoughts" about NET_UNREACH,
538 I believe they are just ether pollution. --ANK
539 */
540 break;
541 }
542 break;
543 case ICMP_TIME_EXCEEDED:
544 if (code != ICMP_EXC_TTL)
545 return 0;
546 break;
547 case ICMP_REDIRECT:
548 break;
549 }
550
551 err = -ENOENT;
552
553 t = ipip6_tunnel_lookup(dev_net(skb->dev),
554 skb->dev,
555 iph->daddr,
556 iph->saddr);
557 if (t == NULL)
558 goto out;
559
560 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
561 ipv4_update_pmtu(skb, dev_net(skb->dev), info,
562 t->dev->ifindex, 0, IPPROTO_IPV6, 0);
563 err = 0;
564 goto out;
565 }
566 if (type == ICMP_REDIRECT) {
567 ipv4_redirect(skb, dev_net(skb->dev), t->dev->ifindex, 0,
568 IPPROTO_IPV6, 0);
569 err = 0;
570 goto out;
571 }
572
573 if (t->parms.iph.daddr == 0)
574 goto out;
575
576 err = 0;
577 if (!ipip6_err_gen_icmpv6_unreach(skb))
578 goto out;
579
580 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
581 goto out;
582
583 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
584 t->err_count++;
585 else
586 t->err_count = 1;
587 t->err_time = jiffies;
588 out:
589 return err;
590 }
591
592 static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr,
593 const struct in6_addr *v6addr)
594 {
595 __be32 v4embed = 0;
596 if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed)
597 return true;
598 return false;
599 }
600
601 /* Checks if an address matches an address on the tunnel interface.
602 * Used to detect the NAT of proto 41 packets and let them pass spoofing test.
603 * Long story:
604 * This function is called after we considered the packet as spoofed
605 * in is_spoofed_6rd.
606 * We may have a router that is doing NAT for proto 41 packets
607 * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb
608 * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd
609 * function will return true, dropping the packet.
610 * But, we can still check if is spoofed against the IP
611 * addresses associated with the interface.
612 */
613 static bool only_dnatted(const struct ip_tunnel *tunnel,
614 const struct in6_addr *v6dst)
615 {
616 int prefix_len;
617
618 #ifdef CONFIG_IPV6_SIT_6RD
619 prefix_len = tunnel->ip6rd.prefixlen + 32
620 - tunnel->ip6rd.relay_prefixlen;
621 #else
622 prefix_len = 48;
623 #endif
624 return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev);
625 }
626
627 /* Returns true if a packet is spoofed */
628 static bool packet_is_spoofed(struct sk_buff *skb,
629 const struct iphdr *iph,
630 struct ip_tunnel *tunnel)
631 {
632 const struct ipv6hdr *ipv6h;
633
634 if (tunnel->dev->priv_flags & IFF_ISATAP) {
635 if (!isatap_chksrc(skb, iph, tunnel))
636 return true;
637
638 return false;
639 }
640
641 if (tunnel->dev->flags & IFF_POINTOPOINT)
642 return false;
643
644 ipv6h = ipv6_hdr(skb);
645
646 if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) {
647 net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n",
648 &iph->saddr, &ipv6h->saddr,
649 &iph->daddr, &ipv6h->daddr);
650 return true;
651 }
652
653 if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr)))
654 return false;
655
656 if (only_dnatted(tunnel, &ipv6h->daddr))
657 return false;
658
659 net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n",
660 &iph->saddr, &ipv6h->saddr,
661 &iph->daddr, &ipv6h->daddr);
662 return true;
663 }
664
665 static int ipip6_rcv(struct sk_buff *skb)
666 {
667 const struct iphdr *iph = ip_hdr(skb);
668 struct ip_tunnel *tunnel;
669 int err;
670
671 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
672 iph->saddr, iph->daddr);
673 if (tunnel != NULL) {
674 struct pcpu_tstats *tstats;
675
676 if (tunnel->parms.iph.protocol != IPPROTO_IPV6 &&
677 tunnel->parms.iph.protocol != 0)
678 goto out;
679
680 skb->mac_header = skb->network_header;
681 skb_reset_network_header(skb);
682 IPCB(skb)->flags = 0;
683 skb->protocol = htons(ETH_P_IPV6);
684
685 if (packet_is_spoofed(skb, iph, tunnel)) {
686 tunnel->dev->stats.rx_errors++;
687 goto out;
688 }
689
690 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
691
692 err = IP_ECN_decapsulate(iph, skb);
693 if (unlikely(err)) {
694 if (log_ecn_error)
695 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
696 &iph->saddr, iph->tos);
697 if (err > 1) {
698 ++tunnel->dev->stats.rx_frame_errors;
699 ++tunnel->dev->stats.rx_errors;
700 goto out;
701 }
702 }
703
704 tstats = this_cpu_ptr(tunnel->dev->tstats);
705 tstats->rx_packets++;
706 tstats->rx_bytes += skb->len;
707
708 netif_rx(skb);
709
710 return 0;
711 }
712
713 /* no tunnel matched, let upstream know, ipsec may handle it */
714 return 1;
715 out:
716 kfree_skb(skb);
717 return 0;
718 }
719
720 static const struct tnl_ptk_info tpi = {
721 /* no tunnel info required for ipip. */
722 .proto = htons(ETH_P_IP),
723 };
724
725 static int ipip_rcv(struct sk_buff *skb)
726 {
727 const struct iphdr *iph;
728 struct ip_tunnel *tunnel;
729
730 iph = ip_hdr(skb);
731 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
732 iph->saddr, iph->daddr);
733 if (tunnel != NULL) {
734 if (tunnel->parms.iph.protocol != IPPROTO_IPIP &&
735 tunnel->parms.iph.protocol != 0)
736 goto drop;
737
738 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
739 goto drop;
740 if (iptunnel_pull_header(skb, 0, tpi.proto))
741 goto drop;
742 return ip_tunnel_rcv(tunnel, skb, &tpi, log_ecn_error);
743 }
744
745 return 1;
746
747 drop:
748 kfree_skb(skb);
749 return 0;
750 }
751
752 /*
753 * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function
754 * stores the embedded IPv4 address in v4dst and returns true.
755 */
756 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst,
757 __be32 *v4dst)
758 {
759 #ifdef CONFIG_IPV6_SIT_6RD
760 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix,
761 tunnel->ip6rd.prefixlen)) {
762 unsigned int pbw0, pbi0;
763 int pbi1;
764 u32 d;
765
766 pbw0 = tunnel->ip6rd.prefixlen >> 5;
767 pbi0 = tunnel->ip6rd.prefixlen & 0x1f;
768
769 d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >>
770 tunnel->ip6rd.relay_prefixlen;
771
772 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen;
773 if (pbi1 > 0)
774 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >>
775 (32 - pbi1);
776
777 *v4dst = tunnel->ip6rd.relay_prefix | htonl(d);
778 return true;
779 }
780 #else
781 if (v6dst->s6_addr16[0] == htons(0x2002)) {
782 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
783 memcpy(v4dst, &v6dst->s6_addr16[1], 4);
784 return true;
785 }
786 #endif
787 return false;
788 }
789
790 static inline __be32 try_6rd(struct ip_tunnel *tunnel,
791 const struct in6_addr *v6dst)
792 {
793 __be32 dst = 0;
794 check_6rd(tunnel, v6dst, &dst);
795 return dst;
796 }
797
798 /*
799 * This function assumes it is being called from dev_queue_xmit()
800 * and that skb is filled properly by that function.
801 */
802
803 static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
804 struct net_device *dev)
805 {
806 struct ip_tunnel *tunnel = netdev_priv(dev);
807 const struct iphdr *tiph = &tunnel->parms.iph;
808 const struct ipv6hdr *iph6 = ipv6_hdr(skb);
809 u8 tos = tunnel->parms.iph.tos;
810 __be16 df = tiph->frag_off;
811 struct rtable *rt; /* Route to the other host */
812 struct net_device *tdev; /* Device to other host */
813 unsigned int max_headroom; /* The extra header space needed */
814 __be32 dst = tiph->daddr;
815 struct flowi4 fl4;
816 int mtu;
817 const struct in6_addr *addr6;
818 int addr_type;
819 u8 ttl;
820 int err;
821
822 if (skb->protocol != htons(ETH_P_IPV6))
823 goto tx_error;
824
825 if (tos == 1)
826 tos = ipv6_get_dsfield(iph6);
827
828 /* ISATAP (RFC4214) - must come before 6to4 */
829 if (dev->priv_flags & IFF_ISATAP) {
830 struct neighbour *neigh = NULL;
831 bool do_tx_error = false;
832
833 if (skb_dst(skb))
834 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
835
836 if (neigh == NULL) {
837 net_dbg_ratelimited("nexthop == NULL\n");
838 goto tx_error;
839 }
840
841 addr6 = (const struct in6_addr *)&neigh->primary_key;
842 addr_type = ipv6_addr_type(addr6);
843
844 if ((addr_type & IPV6_ADDR_UNICAST) &&
845 ipv6_addr_is_isatap(addr6))
846 dst = addr6->s6_addr32[3];
847 else
848 do_tx_error = true;
849
850 neigh_release(neigh);
851 if (do_tx_error)
852 goto tx_error;
853 }
854
855 if (!dst)
856 dst = try_6rd(tunnel, &iph6->daddr);
857
858 if (!dst) {
859 struct neighbour *neigh = NULL;
860 bool do_tx_error = false;
861
862 if (skb_dst(skb))
863 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
864
865 if (neigh == NULL) {
866 net_dbg_ratelimited("nexthop == NULL\n");
867 goto tx_error;
868 }
869
870 addr6 = (const struct in6_addr *)&neigh->primary_key;
871 addr_type = ipv6_addr_type(addr6);
872
873 if (addr_type == IPV6_ADDR_ANY) {
874 addr6 = &ipv6_hdr(skb)->daddr;
875 addr_type = ipv6_addr_type(addr6);
876 }
877
878 if ((addr_type & IPV6_ADDR_COMPATv4) != 0)
879 dst = addr6->s6_addr32[3];
880 else
881 do_tx_error = true;
882
883 neigh_release(neigh);
884 if (do_tx_error)
885 goto tx_error;
886 }
887
888 rt = ip_route_output_ports(tunnel->net, &fl4, NULL,
889 dst, tiph->saddr,
890 0, 0,
891 IPPROTO_IPV6, RT_TOS(tos),
892 tunnel->parms.link);
893 if (IS_ERR(rt)) {
894 dev->stats.tx_carrier_errors++;
895 goto tx_error_icmp;
896 }
897 if (rt->rt_type != RTN_UNICAST) {
898 ip_rt_put(rt);
899 dev->stats.tx_carrier_errors++;
900 goto tx_error_icmp;
901 }
902 tdev = rt->dst.dev;
903
904 if (tdev == dev) {
905 ip_rt_put(rt);
906 dev->stats.collisions++;
907 goto tx_error;
908 }
909
910 if (df) {
911 mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr);
912
913 if (mtu < 68) {
914 dev->stats.collisions++;
915 ip_rt_put(rt);
916 goto tx_error;
917 }
918
919 if (mtu < IPV6_MIN_MTU) {
920 mtu = IPV6_MIN_MTU;
921 df = 0;
922 }
923
924 if (tunnel->parms.iph.daddr && skb_dst(skb))
925 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
926
927 if (skb->len > mtu) {
928 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
929 ip_rt_put(rt);
930 goto tx_error;
931 }
932 }
933
934 if (tunnel->err_count > 0) {
935 if (time_before(jiffies,
936 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
937 tunnel->err_count--;
938 dst_link_failure(skb);
939 } else
940 tunnel->err_count = 0;
941 }
942
943 /*
944 * Okay, now see if we can stuff it in the buffer as-is.
945 */
946 max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr);
947
948 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
949 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
950 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
951 if (!new_skb) {
952 ip_rt_put(rt);
953 dev->stats.tx_dropped++;
954 kfree_skb(skb);
955 return NETDEV_TX_OK;
956 }
957 if (skb->sk)
958 skb_set_owner_w(new_skb, skb->sk);
959 dev_kfree_skb(skb);
960 skb = new_skb;
961 iph6 = ipv6_hdr(skb);
962 }
963 ttl = tiph->ttl;
964 if (ttl == 0)
965 ttl = iph6->hop_limit;
966 tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
967
968 skb = iptunnel_handle_offloads(skb, false, SKB_GSO_SIT);
969 if (IS_ERR(skb))
970 goto out;
971
972 err = iptunnel_xmit(rt, skb, fl4.saddr, fl4.daddr, IPPROTO_IPV6, tos,
973 ttl, df, !net_eq(tunnel->net, dev_net(dev)));
974 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
975 return NETDEV_TX_OK;
976
977 tx_error_icmp:
978 dst_link_failure(skb);
979 tx_error:
980 kfree_skb(skb);
981 out:
982 dev->stats.tx_errors++;
983 return NETDEV_TX_OK;
984 }
985
986 static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
987 {
988 struct ip_tunnel *tunnel = netdev_priv(dev);
989 const struct iphdr *tiph = &tunnel->parms.iph;
990
991 skb = iptunnel_handle_offloads(skb, false, SKB_GSO_IPIP);
992 if (IS_ERR(skb))
993 goto out;
994
995 ip_tunnel_xmit(skb, dev, tiph, IPPROTO_IPIP);
996 return NETDEV_TX_OK;
997 out:
998 dev->stats.tx_errors++;
999 return NETDEV_TX_OK;
1000 }
1001
1002 static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb,
1003 struct net_device *dev)
1004 {
1005 switch (skb->protocol) {
1006 case htons(ETH_P_IP):
1007 ipip_tunnel_xmit(skb, dev);
1008 break;
1009 case htons(ETH_P_IPV6):
1010 ipip6_tunnel_xmit(skb, dev);
1011 break;
1012 default:
1013 goto tx_err;
1014 }
1015
1016 return NETDEV_TX_OK;
1017
1018 tx_err:
1019 dev->stats.tx_errors++;
1020 kfree_skb(skb);
1021 return NETDEV_TX_OK;
1022
1023 }
1024
1025 static void ipip6_tunnel_bind_dev(struct net_device *dev)
1026 {
1027 struct net_device *tdev = NULL;
1028 struct ip_tunnel *tunnel;
1029 const struct iphdr *iph;
1030 struct flowi4 fl4;
1031
1032 tunnel = netdev_priv(dev);
1033 iph = &tunnel->parms.iph;
1034
1035 if (iph->daddr) {
1036 struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4,
1037 NULL,
1038 iph->daddr, iph->saddr,
1039 0, 0,
1040 IPPROTO_IPV6,
1041 RT_TOS(iph->tos),
1042 tunnel->parms.link);
1043
1044 if (!IS_ERR(rt)) {
1045 tdev = rt->dst.dev;
1046 ip_rt_put(rt);
1047 }
1048 dev->flags |= IFF_POINTOPOINT;
1049 }
1050
1051 if (!tdev && tunnel->parms.link)
1052 tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link);
1053
1054 if (tdev) {
1055 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
1056 dev->mtu = tdev->mtu - sizeof(struct iphdr);
1057 if (dev->mtu < IPV6_MIN_MTU)
1058 dev->mtu = IPV6_MIN_MTU;
1059 }
1060 dev->iflink = tunnel->parms.link;
1061 }
1062
1063 static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p)
1064 {
1065 struct net *net = t->net;
1066 struct sit_net *sitn = net_generic(net, sit_net_id);
1067
1068 ipip6_tunnel_unlink(sitn, t);
1069 synchronize_net();
1070 t->parms.iph.saddr = p->iph.saddr;
1071 t->parms.iph.daddr = p->iph.daddr;
1072 memcpy(t->dev->dev_addr, &p->iph.saddr, 4);
1073 memcpy(t->dev->broadcast, &p->iph.daddr, 4);
1074 ipip6_tunnel_link(sitn, t);
1075 t->parms.iph.ttl = p->iph.ttl;
1076 t->parms.iph.tos = p->iph.tos;
1077 if (t->parms.link != p->link) {
1078 t->parms.link = p->link;
1079 ipip6_tunnel_bind_dev(t->dev);
1080 }
1081 netdev_state_change(t->dev);
1082 }
1083
1084 #ifdef CONFIG_IPV6_SIT_6RD
1085 static int ipip6_tunnel_update_6rd(struct ip_tunnel *t,
1086 struct ip_tunnel_6rd *ip6rd)
1087 {
1088 struct in6_addr prefix;
1089 __be32 relay_prefix;
1090
1091 if (ip6rd->relay_prefixlen > 32 ||
1092 ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64)
1093 return -EINVAL;
1094
1095 ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen);
1096 if (!ipv6_addr_equal(&prefix, &ip6rd->prefix))
1097 return -EINVAL;
1098 if (ip6rd->relay_prefixlen)
1099 relay_prefix = ip6rd->relay_prefix &
1100 htonl(0xffffffffUL <<
1101 (32 - ip6rd->relay_prefixlen));
1102 else
1103 relay_prefix = 0;
1104 if (relay_prefix != ip6rd->relay_prefix)
1105 return -EINVAL;
1106
1107 t->ip6rd.prefix = prefix;
1108 t->ip6rd.relay_prefix = relay_prefix;
1109 t->ip6rd.prefixlen = ip6rd->prefixlen;
1110 t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen;
1111 netdev_state_change(t->dev);
1112 return 0;
1113 }
1114 #endif
1115
1116 static int
1117 ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
1118 {
1119 int err = 0;
1120 struct ip_tunnel_parm p;
1121 struct ip_tunnel_prl prl;
1122 struct ip_tunnel *t;
1123 struct net *net = dev_net(dev);
1124 struct sit_net *sitn = net_generic(net, sit_net_id);
1125 #ifdef CONFIG_IPV6_SIT_6RD
1126 struct ip_tunnel_6rd ip6rd;
1127 #endif
1128
1129 switch (cmd) {
1130 case SIOCGETTUNNEL:
1131 #ifdef CONFIG_IPV6_SIT_6RD
1132 case SIOCGET6RD:
1133 #endif
1134 t = NULL;
1135 if (dev == sitn->fb_tunnel_dev) {
1136 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1137 err = -EFAULT;
1138 break;
1139 }
1140 t = ipip6_tunnel_locate(net, &p, 0);
1141 }
1142 if (t == NULL)
1143 t = netdev_priv(dev);
1144
1145 err = -EFAULT;
1146 if (cmd == SIOCGETTUNNEL) {
1147 memcpy(&p, &t->parms, sizeof(p));
1148 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p,
1149 sizeof(p)))
1150 goto done;
1151 #ifdef CONFIG_IPV6_SIT_6RD
1152 } else {
1153 ip6rd.prefix = t->ip6rd.prefix;
1154 ip6rd.relay_prefix = t->ip6rd.relay_prefix;
1155 ip6rd.prefixlen = t->ip6rd.prefixlen;
1156 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen;
1157 if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd,
1158 sizeof(ip6rd)))
1159 goto done;
1160 #endif
1161 }
1162 err = 0;
1163 break;
1164
1165 case SIOCADDTUNNEL:
1166 case SIOCCHGTUNNEL:
1167 err = -EPERM;
1168 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1169 goto done;
1170
1171 err = -EFAULT;
1172 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1173 goto done;
1174
1175 err = -EINVAL;
1176 if (p.iph.protocol != IPPROTO_IPV6 &&
1177 p.iph.protocol != IPPROTO_IPIP &&
1178 p.iph.protocol != 0)
1179 goto done;
1180 if (p.iph.version != 4 ||
1181 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
1182 goto done;
1183 if (p.iph.ttl)
1184 p.iph.frag_off |= htons(IP_DF);
1185
1186 t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
1187
1188 if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1189 if (t != NULL) {
1190 if (t->dev != dev) {
1191 err = -EEXIST;
1192 break;
1193 }
1194 } else {
1195 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
1196 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
1197 err = -EINVAL;
1198 break;
1199 }
1200 t = netdev_priv(dev);
1201 }
1202
1203 ipip6_tunnel_update(t, &p);
1204 }
1205
1206 if (t) {
1207 err = 0;
1208 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
1209 err = -EFAULT;
1210 } else
1211 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1212 break;
1213
1214 case SIOCDELTUNNEL:
1215 err = -EPERM;
1216 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1217 goto done;
1218
1219 if (dev == sitn->fb_tunnel_dev) {
1220 err = -EFAULT;
1221 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1222 goto done;
1223 err = -ENOENT;
1224 if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL)
1225 goto done;
1226 err = -EPERM;
1227 if (t == netdev_priv(sitn->fb_tunnel_dev))
1228 goto done;
1229 dev = t->dev;
1230 }
1231 unregister_netdevice(dev);
1232 err = 0;
1233 break;
1234
1235 case SIOCGETPRL:
1236 err = -EINVAL;
1237 if (dev == sitn->fb_tunnel_dev)
1238 goto done;
1239 err = -ENOENT;
1240 if (!(t = netdev_priv(dev)))
1241 goto done;
1242 err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data);
1243 break;
1244
1245 case SIOCADDPRL:
1246 case SIOCDELPRL:
1247 case SIOCCHGPRL:
1248 err = -EPERM;
1249 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1250 goto done;
1251 err = -EINVAL;
1252 if (dev == sitn->fb_tunnel_dev)
1253 goto done;
1254 err = -EFAULT;
1255 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))
1256 goto done;
1257 err = -ENOENT;
1258 if (!(t = netdev_priv(dev)))
1259 goto done;
1260
1261 switch (cmd) {
1262 case SIOCDELPRL:
1263 err = ipip6_tunnel_del_prl(t, &prl);
1264 break;
1265 case SIOCADDPRL:
1266 case SIOCCHGPRL:
1267 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
1268 break;
1269 }
1270 netdev_state_change(dev);
1271 break;
1272
1273 #ifdef CONFIG_IPV6_SIT_6RD
1274 case SIOCADD6RD:
1275 case SIOCCHG6RD:
1276 case SIOCDEL6RD:
1277 err = -EPERM;
1278 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1279 goto done;
1280
1281 err = -EFAULT;
1282 if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data,
1283 sizeof(ip6rd)))
1284 goto done;
1285
1286 t = netdev_priv(dev);
1287
1288 if (cmd != SIOCDEL6RD) {
1289 err = ipip6_tunnel_update_6rd(t, &ip6rd);
1290 if (err < 0)
1291 goto done;
1292 } else
1293 ipip6_tunnel_clone_6rd(dev, sitn);
1294
1295 err = 0;
1296 break;
1297 #endif
1298
1299 default:
1300 err = -EINVAL;
1301 }
1302
1303 done:
1304 return err;
1305 }
1306
1307 static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1308 {
1309 if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr))
1310 return -EINVAL;
1311 dev->mtu = new_mtu;
1312 return 0;
1313 }
1314
1315 static const struct net_device_ops ipip6_netdev_ops = {
1316 .ndo_uninit = ipip6_tunnel_uninit,
1317 .ndo_start_xmit = sit_tunnel_xmit,
1318 .ndo_do_ioctl = ipip6_tunnel_ioctl,
1319 .ndo_change_mtu = ipip6_tunnel_change_mtu,
1320 .ndo_get_stats64 = ip_tunnel_get_stats64,
1321 };
1322
1323 static void ipip6_dev_free(struct net_device *dev)
1324 {
1325 free_percpu(dev->tstats);
1326 free_netdev(dev);
1327 }
1328
1329 #define SIT_FEATURES (NETIF_F_SG | \
1330 NETIF_F_FRAGLIST | \
1331 NETIF_F_HIGHDMA | \
1332 NETIF_F_GSO_SOFTWARE | \
1333 NETIF_F_HW_CSUM)
1334
1335 static void ipip6_tunnel_setup(struct net_device *dev)
1336 {
1337 dev->netdev_ops = &ipip6_netdev_ops;
1338 dev->destructor = ipip6_dev_free;
1339
1340 dev->type = ARPHRD_SIT;
1341 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
1342 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr);
1343 dev->flags = IFF_NOARP;
1344 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1345 dev->iflink = 0;
1346 dev->addr_len = 4;
1347 dev->features |= NETIF_F_LLTX;
1348 dev->features |= SIT_FEATURES;
1349 dev->hw_features |= SIT_FEATURES;
1350 }
1351
1352 static int ipip6_tunnel_init(struct net_device *dev)
1353 {
1354 struct ip_tunnel *tunnel = netdev_priv(dev);
1355 int i;
1356
1357 tunnel->dev = dev;
1358 tunnel->net = dev_net(dev);
1359
1360 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
1361 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
1362
1363 ipip6_tunnel_bind_dev(dev);
1364 dev->tstats = alloc_percpu(struct pcpu_tstats);
1365 if (!dev->tstats)
1366 return -ENOMEM;
1367
1368 for_each_possible_cpu(i) {
1369 struct pcpu_tstats *ipip6_tunnel_stats;
1370 ipip6_tunnel_stats = per_cpu_ptr(dev->tstats, i);
1371 u64_stats_init(&ipip6_tunnel_stats->syncp);
1372 }
1373
1374 return 0;
1375 }
1376
1377 static int __net_init ipip6_fb_tunnel_init(struct net_device *dev)
1378 {
1379 struct ip_tunnel *tunnel = netdev_priv(dev);
1380 struct iphdr *iph = &tunnel->parms.iph;
1381 struct net *net = dev_net(dev);
1382 struct sit_net *sitn = net_generic(net, sit_net_id);
1383 int i;
1384
1385 tunnel->dev = dev;
1386 tunnel->net = dev_net(dev);
1387 strcpy(tunnel->parms.name, dev->name);
1388
1389 iph->version = 4;
1390 iph->protocol = IPPROTO_IPV6;
1391 iph->ihl = 5;
1392 iph->ttl = 64;
1393
1394 dev->tstats = alloc_percpu(struct pcpu_tstats);
1395 if (!dev->tstats)
1396 return -ENOMEM;
1397
1398 for_each_possible_cpu(i) {
1399 struct pcpu_tstats *ipip6_fb_stats;
1400 ipip6_fb_stats = per_cpu_ptr(dev->tstats, i);
1401 u64_stats_init(&ipip6_fb_stats->syncp);
1402 }
1403
1404 dev_hold(dev);
1405 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel);
1406 return 0;
1407 }
1408
1409 static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[])
1410 {
1411 u8 proto;
1412
1413 if (!data || !data[IFLA_IPTUN_PROTO])
1414 return 0;
1415
1416 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1417 if (proto != IPPROTO_IPV6 &&
1418 proto != IPPROTO_IPIP &&
1419 proto != 0)
1420 return -EINVAL;
1421
1422 return 0;
1423 }
1424
1425 static void ipip6_netlink_parms(struct nlattr *data[],
1426 struct ip_tunnel_parm *parms)
1427 {
1428 memset(parms, 0, sizeof(*parms));
1429
1430 parms->iph.version = 4;
1431 parms->iph.protocol = IPPROTO_IPV6;
1432 parms->iph.ihl = 5;
1433 parms->iph.ttl = 64;
1434
1435 if (!data)
1436 return;
1437
1438 if (data[IFLA_IPTUN_LINK])
1439 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1440
1441 if (data[IFLA_IPTUN_LOCAL])
1442 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]);
1443
1444 if (data[IFLA_IPTUN_REMOTE])
1445 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]);
1446
1447 if (data[IFLA_IPTUN_TTL]) {
1448 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
1449 if (parms->iph.ttl)
1450 parms->iph.frag_off = htons(IP_DF);
1451 }
1452
1453 if (data[IFLA_IPTUN_TOS])
1454 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
1455
1456 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
1457 parms->iph.frag_off = htons(IP_DF);
1458
1459 if (data[IFLA_IPTUN_FLAGS])
1460 parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]);
1461
1462 if (data[IFLA_IPTUN_PROTO])
1463 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1464
1465 }
1466
1467 #ifdef CONFIG_IPV6_SIT_6RD
1468 /* This function returns true when 6RD attributes are present in the nl msg */
1469 static bool ipip6_netlink_6rd_parms(struct nlattr *data[],
1470 struct ip_tunnel_6rd *ip6rd)
1471 {
1472 bool ret = false;
1473 memset(ip6rd, 0, sizeof(*ip6rd));
1474
1475 if (!data)
1476 return ret;
1477
1478 if (data[IFLA_IPTUN_6RD_PREFIX]) {
1479 ret = true;
1480 nla_memcpy(&ip6rd->prefix, data[IFLA_IPTUN_6RD_PREFIX],
1481 sizeof(struct in6_addr));
1482 }
1483
1484 if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) {
1485 ret = true;
1486 ip6rd->relay_prefix =
1487 nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]);
1488 }
1489
1490 if (data[IFLA_IPTUN_6RD_PREFIXLEN]) {
1491 ret = true;
1492 ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]);
1493 }
1494
1495 if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) {
1496 ret = true;
1497 ip6rd->relay_prefixlen =
1498 nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
1499 }
1500
1501 return ret;
1502 }
1503 #endif
1504
1505 static int ipip6_newlink(struct net *src_net, struct net_device *dev,
1506 struct nlattr *tb[], struct nlattr *data[])
1507 {
1508 struct net *net = dev_net(dev);
1509 struct ip_tunnel *nt;
1510 #ifdef CONFIG_IPV6_SIT_6RD
1511 struct ip_tunnel_6rd ip6rd;
1512 #endif
1513 int err;
1514
1515 nt = netdev_priv(dev);
1516 ipip6_netlink_parms(data, &nt->parms);
1517
1518 if (ipip6_tunnel_locate(net, &nt->parms, 0))
1519 return -EEXIST;
1520
1521 err = ipip6_tunnel_create(dev);
1522 if (err < 0)
1523 return err;
1524
1525 #ifdef CONFIG_IPV6_SIT_6RD
1526 if (ipip6_netlink_6rd_parms(data, &ip6rd))
1527 err = ipip6_tunnel_update_6rd(nt, &ip6rd);
1528 #endif
1529
1530 return err;
1531 }
1532
1533 static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[],
1534 struct nlattr *data[])
1535 {
1536 struct ip_tunnel *t = netdev_priv(dev);
1537 struct ip_tunnel_parm p;
1538 struct net *net = t->net;
1539 struct sit_net *sitn = net_generic(net, sit_net_id);
1540 #ifdef CONFIG_IPV6_SIT_6RD
1541 struct ip_tunnel_6rd ip6rd;
1542 #endif
1543
1544 if (dev == sitn->fb_tunnel_dev)
1545 return -EINVAL;
1546
1547 ipip6_netlink_parms(data, &p);
1548
1549 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
1550 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
1551 return -EINVAL;
1552
1553 t = ipip6_tunnel_locate(net, &p, 0);
1554
1555 if (t) {
1556 if (t->dev != dev)
1557 return -EEXIST;
1558 } else
1559 t = netdev_priv(dev);
1560
1561 ipip6_tunnel_update(t, &p);
1562
1563 #ifdef CONFIG_IPV6_SIT_6RD
1564 if (ipip6_netlink_6rd_parms(data, &ip6rd))
1565 return ipip6_tunnel_update_6rd(t, &ip6rd);
1566 #endif
1567
1568 return 0;
1569 }
1570
1571 static size_t ipip6_get_size(const struct net_device *dev)
1572 {
1573 return
1574 /* IFLA_IPTUN_LINK */
1575 nla_total_size(4) +
1576 /* IFLA_IPTUN_LOCAL */
1577 nla_total_size(4) +
1578 /* IFLA_IPTUN_REMOTE */
1579 nla_total_size(4) +
1580 /* IFLA_IPTUN_TTL */
1581 nla_total_size(1) +
1582 /* IFLA_IPTUN_TOS */
1583 nla_total_size(1) +
1584 /* IFLA_IPTUN_PMTUDISC */
1585 nla_total_size(1) +
1586 /* IFLA_IPTUN_FLAGS */
1587 nla_total_size(2) +
1588 /* IFLA_IPTUN_PROTO */
1589 nla_total_size(1) +
1590 #ifdef CONFIG_IPV6_SIT_6RD
1591 /* IFLA_IPTUN_6RD_PREFIX */
1592 nla_total_size(sizeof(struct in6_addr)) +
1593 /* IFLA_IPTUN_6RD_RELAY_PREFIX */
1594 nla_total_size(4) +
1595 /* IFLA_IPTUN_6RD_PREFIXLEN */
1596 nla_total_size(2) +
1597 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */
1598 nla_total_size(2) +
1599 #endif
1600 0;
1601 }
1602
1603 static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev)
1604 {
1605 struct ip_tunnel *tunnel = netdev_priv(dev);
1606 struct ip_tunnel_parm *parm = &tunnel->parms;
1607
1608 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
1609 nla_put_be32(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
1610 nla_put_be32(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
1611 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
1612 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
1613 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
1614 !!(parm->iph.frag_off & htons(IP_DF))) ||
1615 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) ||
1616 nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags))
1617 goto nla_put_failure;
1618
1619 #ifdef CONFIG_IPV6_SIT_6RD
1620 if (nla_put(skb, IFLA_IPTUN_6RD_PREFIX, sizeof(struct in6_addr),
1621 &tunnel->ip6rd.prefix) ||
1622 nla_put_be32(skb, IFLA_IPTUN_6RD_RELAY_PREFIX,
1623 tunnel->ip6rd.relay_prefix) ||
1624 nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN,
1625 tunnel->ip6rd.prefixlen) ||
1626 nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN,
1627 tunnel->ip6rd.relay_prefixlen))
1628 goto nla_put_failure;
1629 #endif
1630
1631 return 0;
1632
1633 nla_put_failure:
1634 return -EMSGSIZE;
1635 }
1636
1637 static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = {
1638 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
1639 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 },
1640 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 },
1641 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
1642 [IFLA_IPTUN_TOS] = { .type = NLA_U8 },
1643 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 },
1644 [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 },
1645 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
1646 #ifdef CONFIG_IPV6_SIT_6RD
1647 [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) },
1648 [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 },
1649 [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 },
1650 [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 },
1651 #endif
1652 };
1653
1654 static void ipip6_dellink(struct net_device *dev, struct list_head *head)
1655 {
1656 struct net *net = dev_net(dev);
1657 struct sit_net *sitn = net_generic(net, sit_net_id);
1658
1659 if (dev != sitn->fb_tunnel_dev)
1660 unregister_netdevice_queue(dev, head);
1661 }
1662
1663 static struct rtnl_link_ops sit_link_ops __read_mostly = {
1664 .kind = "sit",
1665 .maxtype = IFLA_IPTUN_MAX,
1666 .policy = ipip6_policy,
1667 .priv_size = sizeof(struct ip_tunnel),
1668 .setup = ipip6_tunnel_setup,
1669 .validate = ipip6_validate,
1670 .newlink = ipip6_newlink,
1671 .changelink = ipip6_changelink,
1672 .get_size = ipip6_get_size,
1673 .fill_info = ipip6_fill_info,
1674 .dellink = ipip6_dellink,
1675 };
1676
1677 static struct xfrm_tunnel sit_handler __read_mostly = {
1678 .handler = ipip6_rcv,
1679 .err_handler = ipip6_err,
1680 .priority = 1,
1681 };
1682
1683 static struct xfrm_tunnel ipip_handler __read_mostly = {
1684 .handler = ipip_rcv,
1685 .err_handler = ipip6_err,
1686 .priority = 2,
1687 };
1688
1689 static void __net_exit sit_destroy_tunnels(struct net *net,
1690 struct list_head *head)
1691 {
1692 struct sit_net *sitn = net_generic(net, sit_net_id);
1693 struct net_device *dev, *aux;
1694 int prio;
1695
1696 for_each_netdev_safe(net, dev, aux)
1697 if (dev->rtnl_link_ops == &sit_link_ops)
1698 unregister_netdevice_queue(dev, head);
1699
1700 for (prio = 1; prio < 4; prio++) {
1701 int h;
1702 for (h = 0; h < HASH_SIZE; h++) {
1703 struct ip_tunnel *t;
1704
1705 t = rtnl_dereference(sitn->tunnels[prio][h]);
1706 while (t != NULL) {
1707 /* If dev is in the same netns, it has already
1708 * been added to the list by the previous loop.
1709 */
1710 if (!net_eq(dev_net(t->dev), net))
1711 unregister_netdevice_queue(t->dev,
1712 head);
1713 t = rtnl_dereference(t->next);
1714 }
1715 }
1716 }
1717 }
1718
1719 static int __net_init sit_init_net(struct net *net)
1720 {
1721 struct sit_net *sitn = net_generic(net, sit_net_id);
1722 struct ip_tunnel *t;
1723 int err;
1724
1725 sitn->tunnels[0] = sitn->tunnels_wc;
1726 sitn->tunnels[1] = sitn->tunnels_l;
1727 sitn->tunnels[2] = sitn->tunnels_r;
1728 sitn->tunnels[3] = sitn->tunnels_r_l;
1729
1730 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
1731 ipip6_tunnel_setup);
1732 if (!sitn->fb_tunnel_dev) {
1733 err = -ENOMEM;
1734 goto err_alloc_dev;
1735 }
1736 dev_net_set(sitn->fb_tunnel_dev, net);
1737 sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops;
1738 /* FB netdevice is special: we have one, and only one per netns.
1739 * Allowing to move it to another netns is clearly unsafe.
1740 */
1741 sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1742
1743 err = ipip6_fb_tunnel_init(sitn->fb_tunnel_dev);
1744 if (err)
1745 goto err_dev_free;
1746
1747 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn);
1748
1749 if ((err = register_netdev(sitn->fb_tunnel_dev)))
1750 goto err_reg_dev;
1751
1752 t = netdev_priv(sitn->fb_tunnel_dev);
1753
1754 strcpy(t->parms.name, sitn->fb_tunnel_dev->name);
1755 return 0;
1756
1757 err_reg_dev:
1758 dev_put(sitn->fb_tunnel_dev);
1759 err_dev_free:
1760 ipip6_dev_free(sitn->fb_tunnel_dev);
1761 err_alloc_dev:
1762 return err;
1763 }
1764
1765 static void __net_exit sit_exit_net(struct net *net)
1766 {
1767 LIST_HEAD(list);
1768
1769 rtnl_lock();
1770 sit_destroy_tunnels(net, &list);
1771 unregister_netdevice_many(&list);
1772 rtnl_unlock();
1773 }
1774
1775 static struct pernet_operations sit_net_ops = {
1776 .init = sit_init_net,
1777 .exit = sit_exit_net,
1778 .id = &sit_net_id,
1779 .size = sizeof(struct sit_net),
1780 };
1781
1782 static void __exit sit_cleanup(void)
1783 {
1784 rtnl_link_unregister(&sit_link_ops);
1785 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1786 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
1787
1788 unregister_pernet_device(&sit_net_ops);
1789 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1790 }
1791
1792 static int __init sit_init(void)
1793 {
1794 int err;
1795
1796 pr_info("IPv6 over IPv4 tunneling driver\n");
1797
1798 err = register_pernet_device(&sit_net_ops);
1799 if (err < 0)
1800 return err;
1801 err = xfrm4_tunnel_register(&sit_handler, AF_INET6);
1802 if (err < 0) {
1803 pr_info("%s: can't register ip6ip4\n", __func__);
1804 goto xfrm_tunnel_failed;
1805 }
1806 err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
1807 if (err < 0) {
1808 pr_info("%s: can't register ip4ip4\n", __func__);
1809 goto xfrm_tunnel4_failed;
1810 }
1811 err = rtnl_link_register(&sit_link_ops);
1812 if (err < 0)
1813 goto rtnl_link_failed;
1814
1815 out:
1816 return err;
1817
1818 rtnl_link_failed:
1819 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
1820 xfrm_tunnel4_failed:
1821 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1822 xfrm_tunnel_failed:
1823 unregister_pernet_device(&sit_net_ops);
1824 goto out;
1825 }
1826
1827 module_init(sit_init);
1828 module_exit(sit_cleanup);
1829 MODULE_LICENSE("GPL");
1830 MODULE_ALIAS_NETDEV("sit0");
Linux with added FPC-III support