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Merge tag 'v3.10.57' into update
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / ipv6 / sit.c
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 net *net = dev_net(dev);
470 struct sit_net *sitn = net_generic(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, netdev_priv(dev));
476 ipip6_tunnel_del_prl(netdev_priv(dev), NULL);
477 }
478 dev_put(dev);
479 }
480
481
482 static int ipip6_err(struct sk_buff *skb, u32 info)
483 {
484
485 /* All the routers (except for Linux) return only
486 8 bytes of packet payload. It means, that precise relaying of
487 ICMP in the real Internet is absolutely infeasible.
488 */
489 const struct iphdr *iph = (const struct iphdr *)skb->data;
490 const int type = icmp_hdr(skb)->type;
491 const int code = icmp_hdr(skb)->code;
492 struct ip_tunnel *t;
493 int err;
494
495 switch (type) {
496 default:
497 case ICMP_PARAMETERPROB:
498 return 0;
499
500 case ICMP_DEST_UNREACH:
501 switch (code) {
502 case ICMP_SR_FAILED:
503 case ICMP_PORT_UNREACH:
504 /* Impossible event. */
505 return 0;
506 default:
507 /* All others are translated to HOST_UNREACH.
508 rfc2003 contains "deep thoughts" about NET_UNREACH,
509 I believe they are just ether pollution. --ANK
510 */
511 break;
512 }
513 break;
514 case ICMP_TIME_EXCEEDED:
515 if (code != ICMP_EXC_TTL)
516 return 0;
517 break;
518 case ICMP_REDIRECT:
519 break;
520 }
521
522 err = -ENOENT;
523
524 t = ipip6_tunnel_lookup(dev_net(skb->dev),
525 skb->dev,
526 iph->daddr,
527 iph->saddr);
528 if (t == NULL)
529 goto out;
530
531 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
532 ipv4_update_pmtu(skb, dev_net(skb->dev), info,
533 t->parms.link, 0, IPPROTO_IPV6, 0);
534 err = 0;
535 goto out;
536 }
537 if (type == ICMP_REDIRECT) {
538 ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 0,
539 IPPROTO_IPV6, 0);
540 err = 0;
541 goto out;
542 }
543
544 if (t->parms.iph.daddr == 0)
545 goto out;
546
547 err = 0;
548 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
549 goto out;
550
551 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
552 t->err_count++;
553 else
554 t->err_count = 1;
555 t->err_time = jiffies;
556 out:
557 return err;
558 }
559
560 static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr,
561 const struct in6_addr *v6addr)
562 {
563 __be32 v4embed = 0;
564 if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed)
565 return true;
566 return false;
567 }
568
569 /* Checks if an address matches an address on the tunnel interface.
570 * Used to detect the NAT of proto 41 packets and let them pass spoofing test.
571 * Long story:
572 * This function is called after we considered the packet as spoofed
573 * in is_spoofed_6rd.
574 * We may have a router that is doing NAT for proto 41 packets
575 * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb
576 * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd
577 * function will return true, dropping the packet.
578 * But, we can still check if is spoofed against the IP
579 * addresses associated with the interface.
580 */
581 static bool only_dnatted(const struct ip_tunnel *tunnel,
582 const struct in6_addr *v6dst)
583 {
584 int prefix_len;
585
586 #ifdef CONFIG_IPV6_SIT_6RD
587 prefix_len = tunnel->ip6rd.prefixlen + 32
588 - tunnel->ip6rd.relay_prefixlen;
589 #else
590 prefix_len = 48;
591 #endif
592 return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev);
593 }
594
595 /* Returns true if a packet is spoofed */
596 static bool packet_is_spoofed(struct sk_buff *skb,
597 const struct iphdr *iph,
598 struct ip_tunnel *tunnel)
599 {
600 const struct ipv6hdr *ipv6h;
601
602 if (tunnel->dev->priv_flags & IFF_ISATAP) {
603 if (!isatap_chksrc(skb, iph, tunnel))
604 return true;
605
606 return false;
607 }
608
609 if (tunnel->dev->flags & IFF_POINTOPOINT)
610 return false;
611
612 ipv6h = ipv6_hdr(skb);
613
614 if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) {
615 net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n",
616 &iph->saddr, &ipv6h->saddr,
617 &iph->daddr, &ipv6h->daddr);
618 return true;
619 }
620
621 if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr)))
622 return false;
623
624 if (only_dnatted(tunnel, &ipv6h->daddr))
625 return false;
626
627 net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n",
628 &iph->saddr, &ipv6h->saddr,
629 &iph->daddr, &ipv6h->daddr);
630 return true;
631 }
632
633 static int ipip6_rcv(struct sk_buff *skb)
634 {
635 const struct iphdr *iph = ip_hdr(skb);
636 struct ip_tunnel *tunnel;
637 int err;
638
639 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
640 iph->saddr, iph->daddr);
641 if (tunnel != NULL) {
642 struct pcpu_tstats *tstats;
643
644 secpath_reset(skb);
645 skb->mac_header = skb->network_header;
646 skb_reset_network_header(skb);
647 IPCB(skb)->flags = 0;
648 skb->protocol = htons(ETH_P_IPV6);
649 skb->pkt_type = PACKET_HOST;
650
651 if (packet_is_spoofed(skb, iph, tunnel)) {
652 tunnel->dev->stats.rx_errors++;
653 goto out;
654 }
655
656 __skb_tunnel_rx(skb, tunnel->dev);
657
658 err = IP_ECN_decapsulate(iph, skb);
659 if (unlikely(err)) {
660 if (log_ecn_error)
661 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
662 &iph->saddr, iph->tos);
663 if (err > 1) {
664 ++tunnel->dev->stats.rx_frame_errors;
665 ++tunnel->dev->stats.rx_errors;
666 goto out;
667 }
668 }
669
670 tstats = this_cpu_ptr(tunnel->dev->tstats);
671 tstats->rx_packets++;
672 tstats->rx_bytes += skb->len;
673
674 netif_rx(skb);
675
676 return 0;
677 }
678
679 /* no tunnel matched, let upstream know, ipsec may handle it */
680 return 1;
681 out:
682 kfree_skb(skb);
683 return 0;
684 }
685
686 /*
687 * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function
688 * stores the embedded IPv4 address in v4dst and returns true.
689 */
690 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst,
691 __be32 *v4dst)
692 {
693 #ifdef CONFIG_IPV6_SIT_6RD
694 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix,
695 tunnel->ip6rd.prefixlen)) {
696 unsigned int pbw0, pbi0;
697 int pbi1;
698 u32 d;
699
700 pbw0 = tunnel->ip6rd.prefixlen >> 5;
701 pbi0 = tunnel->ip6rd.prefixlen & 0x1f;
702
703 d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >>
704 tunnel->ip6rd.relay_prefixlen;
705
706 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen;
707 if (pbi1 > 0)
708 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >>
709 (32 - pbi1);
710
711 *v4dst = tunnel->ip6rd.relay_prefix | htonl(d);
712 return true;
713 }
714 #else
715 if (v6dst->s6_addr16[0] == htons(0x2002)) {
716 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
717 memcpy(v4dst, &v6dst->s6_addr16[1], 4);
718 return true;
719 }
720 #endif
721 return false;
722 }
723
724 static inline __be32 try_6rd(struct ip_tunnel *tunnel,
725 const struct in6_addr *v6dst)
726 {
727 __be32 dst = 0;
728 check_6rd(tunnel, v6dst, &dst);
729 return dst;
730 }
731
732 /*
733 * This function assumes it is being called from dev_queue_xmit()
734 * and that skb is filled properly by that function.
735 */
736
737 static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
738 struct net_device *dev)
739 {
740 struct ip_tunnel *tunnel = netdev_priv(dev);
741 const struct iphdr *tiph = &tunnel->parms.iph;
742 const struct ipv6hdr *iph6 = ipv6_hdr(skb);
743 u8 tos = tunnel->parms.iph.tos;
744 __be16 df = tiph->frag_off;
745 struct rtable *rt; /* Route to the other host */
746 struct net_device *tdev; /* Device to other host */
747 struct iphdr *iph; /* Our new IP header */
748 unsigned int max_headroom; /* The extra header space needed */
749 __be32 dst = tiph->daddr;
750 struct flowi4 fl4;
751 int mtu;
752 const struct in6_addr *addr6;
753 int addr_type;
754
755 if (skb->protocol != htons(ETH_P_IPV6))
756 goto tx_error;
757
758 if (tos == 1)
759 tos = ipv6_get_dsfield(iph6);
760
761 /* ISATAP (RFC4214) - must come before 6to4 */
762 if (dev->priv_flags & IFF_ISATAP) {
763 struct neighbour *neigh = NULL;
764 bool do_tx_error = false;
765
766 if (skb_dst(skb))
767 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
768
769 if (neigh == NULL) {
770 net_dbg_ratelimited("nexthop == NULL\n");
771 goto tx_error;
772 }
773
774 addr6 = (const struct in6_addr *)&neigh->primary_key;
775 addr_type = ipv6_addr_type(addr6);
776
777 if ((addr_type & IPV6_ADDR_UNICAST) &&
778 ipv6_addr_is_isatap(addr6))
779 dst = addr6->s6_addr32[3];
780 else
781 do_tx_error = true;
782
783 neigh_release(neigh);
784 if (do_tx_error)
785 goto tx_error;
786 }
787
788 if (!dst)
789 dst = try_6rd(tunnel, &iph6->daddr);
790
791 if (!dst) {
792 struct neighbour *neigh = NULL;
793 bool do_tx_error = false;
794
795 if (skb_dst(skb))
796 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
797
798 if (neigh == NULL) {
799 net_dbg_ratelimited("nexthop == NULL\n");
800 goto tx_error;
801 }
802
803 addr6 = (const struct in6_addr *)&neigh->primary_key;
804 addr_type = ipv6_addr_type(addr6);
805
806 if (addr_type == IPV6_ADDR_ANY) {
807 addr6 = &ipv6_hdr(skb)->daddr;
808 addr_type = ipv6_addr_type(addr6);
809 }
810
811 if ((addr_type & IPV6_ADDR_COMPATv4) != 0)
812 dst = addr6->s6_addr32[3];
813 else
814 do_tx_error = true;
815
816 neigh_release(neigh);
817 if (do_tx_error)
818 goto tx_error;
819 }
820
821 rt = ip_route_output_ports(dev_net(dev), &fl4, NULL,
822 dst, tiph->saddr,
823 0, 0,
824 IPPROTO_IPV6, RT_TOS(tos),
825 tunnel->parms.link);
826 if (IS_ERR(rt)) {
827 dev->stats.tx_carrier_errors++;
828 goto tx_error_icmp;
829 }
830 if (rt->rt_type != RTN_UNICAST) {
831 ip_rt_put(rt);
832 dev->stats.tx_carrier_errors++;
833 goto tx_error_icmp;
834 }
835 tdev = rt->dst.dev;
836
837 if (tdev == dev) {
838 ip_rt_put(rt);
839 dev->stats.collisions++;
840 goto tx_error;
841 }
842
843 if (df) {
844 mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr);
845
846 if (mtu < 68) {
847 dev->stats.collisions++;
848 ip_rt_put(rt);
849 goto tx_error;
850 }
851
852 if (mtu < IPV6_MIN_MTU) {
853 mtu = IPV6_MIN_MTU;
854 df = 0;
855 }
856
857 if (tunnel->parms.iph.daddr && skb_dst(skb))
858 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
859
860 if (skb->len > mtu) {
861 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
862 ip_rt_put(rt);
863 goto tx_error;
864 }
865 }
866
867 if (tunnel->err_count > 0) {
868 if (time_before(jiffies,
869 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
870 tunnel->err_count--;
871 dst_link_failure(skb);
872 } else
873 tunnel->err_count = 0;
874 }
875
876 /*
877 * Okay, now see if we can stuff it in the buffer as-is.
878 */
879 max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr);
880
881 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
882 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
883 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
884 if (!new_skb) {
885 ip_rt_put(rt);
886 dev->stats.tx_dropped++;
887 dev_kfree_skb(skb);
888 return NETDEV_TX_OK;
889 }
890 if (skb->sk)
891 skb_set_owner_w(new_skb, skb->sk);
892 dev_kfree_skb(skb);
893 skb = new_skb;
894 iph6 = ipv6_hdr(skb);
895 }
896
897 skb->transport_header = skb->network_header;
898 skb_push(skb, sizeof(struct iphdr));
899 skb_reset_network_header(skb);
900 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
901 IPCB(skb)->flags = 0;
902 skb_dst_drop(skb);
903 skb_dst_set(skb, &rt->dst);
904
905 /*
906 * Push down and install the IPIP header.
907 */
908
909 iph = ip_hdr(skb);
910 iph->version = 4;
911 iph->ihl = sizeof(struct iphdr)>>2;
912 iph->frag_off = df;
913 iph->protocol = IPPROTO_IPV6;
914 iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
915 iph->daddr = fl4.daddr;
916 iph->saddr = fl4.saddr;
917
918 if ((iph->ttl = tiph->ttl) == 0)
919 iph->ttl = iph6->hop_limit;
920
921 skb->ip_summed = CHECKSUM_NONE;
922 ip_select_ident(skb, NULL);
923 iptunnel_xmit(skb, dev);
924 return NETDEV_TX_OK;
925
926 tx_error_icmp:
927 dst_link_failure(skb);
928 tx_error:
929 dev->stats.tx_errors++;
930 dev_kfree_skb(skb);
931 return NETDEV_TX_OK;
932 }
933
934 static void ipip6_tunnel_bind_dev(struct net_device *dev)
935 {
936 struct net_device *tdev = NULL;
937 struct ip_tunnel *tunnel;
938 const struct iphdr *iph;
939 struct flowi4 fl4;
940
941 tunnel = netdev_priv(dev);
942 iph = &tunnel->parms.iph;
943
944 if (iph->daddr) {
945 struct rtable *rt = ip_route_output_ports(dev_net(dev), &fl4, NULL,
946 iph->daddr, iph->saddr,
947 0, 0,
948 IPPROTO_IPV6,
949 RT_TOS(iph->tos),
950 tunnel->parms.link);
951
952 if (!IS_ERR(rt)) {
953 tdev = rt->dst.dev;
954 ip_rt_put(rt);
955 }
956 dev->flags |= IFF_POINTOPOINT;
957 }
958
959 if (!tdev && tunnel->parms.link)
960 tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link);
961
962 if (tdev) {
963 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
964 dev->mtu = tdev->mtu - sizeof(struct iphdr);
965 if (dev->mtu < IPV6_MIN_MTU)
966 dev->mtu = IPV6_MIN_MTU;
967 }
968 dev->iflink = tunnel->parms.link;
969 }
970
971 static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p)
972 {
973 struct net *net = dev_net(t->dev);
974 struct sit_net *sitn = net_generic(net, sit_net_id);
975
976 ipip6_tunnel_unlink(sitn, t);
977 synchronize_net();
978 t->parms.iph.saddr = p->iph.saddr;
979 t->parms.iph.daddr = p->iph.daddr;
980 memcpy(t->dev->dev_addr, &p->iph.saddr, 4);
981 memcpy(t->dev->broadcast, &p->iph.daddr, 4);
982 ipip6_tunnel_link(sitn, t);
983 t->parms.iph.ttl = p->iph.ttl;
984 t->parms.iph.tos = p->iph.tos;
985 if (t->parms.link != p->link) {
986 t->parms.link = p->link;
987 ipip6_tunnel_bind_dev(t->dev);
988 }
989 netdev_state_change(t->dev);
990 }
991
992 #ifdef CONFIG_IPV6_SIT_6RD
993 static int ipip6_tunnel_update_6rd(struct ip_tunnel *t,
994 struct ip_tunnel_6rd *ip6rd)
995 {
996 struct in6_addr prefix;
997 __be32 relay_prefix;
998
999 if (ip6rd->relay_prefixlen > 32 ||
1000 ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64)
1001 return -EINVAL;
1002
1003 ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen);
1004 if (!ipv6_addr_equal(&prefix, &ip6rd->prefix))
1005 return -EINVAL;
1006 if (ip6rd->relay_prefixlen)
1007 relay_prefix = ip6rd->relay_prefix &
1008 htonl(0xffffffffUL <<
1009 (32 - ip6rd->relay_prefixlen));
1010 else
1011 relay_prefix = 0;
1012 if (relay_prefix != ip6rd->relay_prefix)
1013 return -EINVAL;
1014
1015 t->ip6rd.prefix = prefix;
1016 t->ip6rd.relay_prefix = relay_prefix;
1017 t->ip6rd.prefixlen = ip6rd->prefixlen;
1018 t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen;
1019 netdev_state_change(t->dev);
1020 return 0;
1021 }
1022 #endif
1023
1024 static int
1025 ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
1026 {
1027 int err = 0;
1028 struct ip_tunnel_parm p;
1029 struct ip_tunnel_prl prl;
1030 struct ip_tunnel *t;
1031 struct net *net = dev_net(dev);
1032 struct sit_net *sitn = net_generic(net, sit_net_id);
1033 #ifdef CONFIG_IPV6_SIT_6RD
1034 struct ip_tunnel_6rd ip6rd;
1035 #endif
1036
1037 switch (cmd) {
1038 case SIOCGETTUNNEL:
1039 #ifdef CONFIG_IPV6_SIT_6RD
1040 case SIOCGET6RD:
1041 #endif
1042 t = NULL;
1043 if (dev == sitn->fb_tunnel_dev) {
1044 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1045 err = -EFAULT;
1046 break;
1047 }
1048 t = ipip6_tunnel_locate(net, &p, 0);
1049 }
1050 if (t == NULL)
1051 t = netdev_priv(dev);
1052
1053 err = -EFAULT;
1054 if (cmd == SIOCGETTUNNEL) {
1055 memcpy(&p, &t->parms, sizeof(p));
1056 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p,
1057 sizeof(p)))
1058 goto done;
1059 #ifdef CONFIG_IPV6_SIT_6RD
1060 } else {
1061 ip6rd.prefix = t->ip6rd.prefix;
1062 ip6rd.relay_prefix = t->ip6rd.relay_prefix;
1063 ip6rd.prefixlen = t->ip6rd.prefixlen;
1064 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen;
1065 if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd,
1066 sizeof(ip6rd)))
1067 goto done;
1068 #endif
1069 }
1070 err = 0;
1071 break;
1072
1073 case SIOCADDTUNNEL:
1074 case SIOCCHGTUNNEL:
1075 err = -EPERM;
1076 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1077 goto done;
1078
1079 err = -EFAULT;
1080 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1081 goto done;
1082
1083 err = -EINVAL;
1084 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 ||
1085 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
1086 goto done;
1087 if (p.iph.ttl)
1088 p.iph.frag_off |= htons(IP_DF);
1089
1090 t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
1091
1092 if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1093 if (t != NULL) {
1094 if (t->dev != dev) {
1095 err = -EEXIST;
1096 break;
1097 }
1098 } else {
1099 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
1100 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
1101 err = -EINVAL;
1102 break;
1103 }
1104 t = netdev_priv(dev);
1105 }
1106
1107 ipip6_tunnel_update(t, &p);
1108 }
1109
1110 if (t) {
1111 err = 0;
1112 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
1113 err = -EFAULT;
1114 } else
1115 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1116 break;
1117
1118 case SIOCDELTUNNEL:
1119 err = -EPERM;
1120 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1121 goto done;
1122
1123 if (dev == sitn->fb_tunnel_dev) {
1124 err = -EFAULT;
1125 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1126 goto done;
1127 err = -ENOENT;
1128 if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL)
1129 goto done;
1130 err = -EPERM;
1131 if (t == netdev_priv(sitn->fb_tunnel_dev))
1132 goto done;
1133 dev = t->dev;
1134 }
1135 unregister_netdevice(dev);
1136 err = 0;
1137 break;
1138
1139 case SIOCGETPRL:
1140 err = -EINVAL;
1141 if (dev == sitn->fb_tunnel_dev)
1142 goto done;
1143 err = -ENOENT;
1144 if (!(t = netdev_priv(dev)))
1145 goto done;
1146 err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data);
1147 break;
1148
1149 case SIOCADDPRL:
1150 case SIOCDELPRL:
1151 case SIOCCHGPRL:
1152 err = -EPERM;
1153 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1154 goto done;
1155 err = -EINVAL;
1156 if (dev == sitn->fb_tunnel_dev)
1157 goto done;
1158 err = -EFAULT;
1159 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))
1160 goto done;
1161 err = -ENOENT;
1162 if (!(t = netdev_priv(dev)))
1163 goto done;
1164
1165 switch (cmd) {
1166 case SIOCDELPRL:
1167 err = ipip6_tunnel_del_prl(t, &prl);
1168 break;
1169 case SIOCADDPRL:
1170 case SIOCCHGPRL:
1171 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
1172 break;
1173 }
1174 netdev_state_change(dev);
1175 break;
1176
1177 #ifdef CONFIG_IPV6_SIT_6RD
1178 case SIOCADD6RD:
1179 case SIOCCHG6RD:
1180 case SIOCDEL6RD:
1181 err = -EPERM;
1182 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1183 goto done;
1184
1185 err = -EFAULT;
1186 if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data,
1187 sizeof(ip6rd)))
1188 goto done;
1189
1190 t = netdev_priv(dev);
1191
1192 if (cmd != SIOCDEL6RD) {
1193 err = ipip6_tunnel_update_6rd(t, &ip6rd);
1194 if (err < 0)
1195 goto done;
1196 } else
1197 ipip6_tunnel_clone_6rd(dev, sitn);
1198
1199 err = 0;
1200 break;
1201 #endif
1202
1203 default:
1204 err = -EINVAL;
1205 }
1206
1207 done:
1208 return err;
1209 }
1210
1211 static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1212 {
1213 if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr))
1214 return -EINVAL;
1215 dev->mtu = new_mtu;
1216 return 0;
1217 }
1218
1219 static const struct net_device_ops ipip6_netdev_ops = {
1220 .ndo_uninit = ipip6_tunnel_uninit,
1221 .ndo_start_xmit = ipip6_tunnel_xmit,
1222 .ndo_do_ioctl = ipip6_tunnel_ioctl,
1223 .ndo_change_mtu = ipip6_tunnel_change_mtu,
1224 .ndo_get_stats64 = ip_tunnel_get_stats64,
1225 };
1226
1227 static void ipip6_dev_free(struct net_device *dev)
1228 {
1229 free_percpu(dev->tstats);
1230 free_netdev(dev);
1231 }
1232
1233 static void ipip6_tunnel_setup(struct net_device *dev)
1234 {
1235 dev->netdev_ops = &ipip6_netdev_ops;
1236 dev->destructor = ipip6_dev_free;
1237
1238 dev->type = ARPHRD_SIT;
1239 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
1240 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr);
1241 dev->flags = IFF_NOARP;
1242 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1243 dev->iflink = 0;
1244 dev->addr_len = 4;
1245 dev->features |= NETIF_F_NETNS_LOCAL;
1246 dev->features |= NETIF_F_LLTX;
1247 }
1248
1249 static int ipip6_tunnel_init(struct net_device *dev)
1250 {
1251 struct ip_tunnel *tunnel = netdev_priv(dev);
1252
1253 tunnel->dev = dev;
1254
1255 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
1256 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
1257
1258 ipip6_tunnel_bind_dev(dev);
1259 dev->tstats = alloc_percpu(struct pcpu_tstats);
1260 if (!dev->tstats)
1261 return -ENOMEM;
1262
1263 return 0;
1264 }
1265
1266 static int __net_init ipip6_fb_tunnel_init(struct net_device *dev)
1267 {
1268 struct ip_tunnel *tunnel = netdev_priv(dev);
1269 struct iphdr *iph = &tunnel->parms.iph;
1270 struct net *net = dev_net(dev);
1271 struct sit_net *sitn = net_generic(net, sit_net_id);
1272
1273 tunnel->dev = dev;
1274 strcpy(tunnel->parms.name, dev->name);
1275
1276 iph->version = 4;
1277 iph->protocol = IPPROTO_IPV6;
1278 iph->ihl = 5;
1279 iph->ttl = 64;
1280
1281 dev->tstats = alloc_percpu(struct pcpu_tstats);
1282 if (!dev->tstats)
1283 return -ENOMEM;
1284 dev_hold(dev);
1285 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel);
1286 return 0;
1287 }
1288
1289 static void ipip6_netlink_parms(struct nlattr *data[],
1290 struct ip_tunnel_parm *parms)
1291 {
1292 memset(parms, 0, sizeof(*parms));
1293
1294 parms->iph.version = 4;
1295 parms->iph.protocol = IPPROTO_IPV6;
1296 parms->iph.ihl = 5;
1297 parms->iph.ttl = 64;
1298
1299 if (!data)
1300 return;
1301
1302 if (data[IFLA_IPTUN_LINK])
1303 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1304
1305 if (data[IFLA_IPTUN_LOCAL])
1306 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]);
1307
1308 if (data[IFLA_IPTUN_REMOTE])
1309 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]);
1310
1311 if (data[IFLA_IPTUN_TTL]) {
1312 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
1313 if (parms->iph.ttl)
1314 parms->iph.frag_off = htons(IP_DF);
1315 }
1316
1317 if (data[IFLA_IPTUN_TOS])
1318 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
1319
1320 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
1321 parms->iph.frag_off = htons(IP_DF);
1322
1323 if (data[IFLA_IPTUN_FLAGS])
1324 parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]);
1325 }
1326
1327 #ifdef CONFIG_IPV6_SIT_6RD
1328 /* This function returns true when 6RD attributes are present in the nl msg */
1329 static bool ipip6_netlink_6rd_parms(struct nlattr *data[],
1330 struct ip_tunnel_6rd *ip6rd)
1331 {
1332 bool ret = false;
1333 memset(ip6rd, 0, sizeof(*ip6rd));
1334
1335 if (!data)
1336 return ret;
1337
1338 if (data[IFLA_IPTUN_6RD_PREFIX]) {
1339 ret = true;
1340 nla_memcpy(&ip6rd->prefix, data[IFLA_IPTUN_6RD_PREFIX],
1341 sizeof(struct in6_addr));
1342 }
1343
1344 if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) {
1345 ret = true;
1346 ip6rd->relay_prefix =
1347 nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]);
1348 }
1349
1350 if (data[IFLA_IPTUN_6RD_PREFIXLEN]) {
1351 ret = true;
1352 ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]);
1353 }
1354
1355 if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) {
1356 ret = true;
1357 ip6rd->relay_prefixlen =
1358 nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
1359 }
1360
1361 return ret;
1362 }
1363 #endif
1364
1365 static int ipip6_newlink(struct net *src_net, struct net_device *dev,
1366 struct nlattr *tb[], struct nlattr *data[])
1367 {
1368 struct net *net = dev_net(dev);
1369 struct ip_tunnel *nt;
1370 #ifdef CONFIG_IPV6_SIT_6RD
1371 struct ip_tunnel_6rd ip6rd;
1372 #endif
1373 int err;
1374
1375 nt = netdev_priv(dev);
1376 ipip6_netlink_parms(data, &nt->parms);
1377
1378 if (ipip6_tunnel_locate(net, &nt->parms, 0))
1379 return -EEXIST;
1380
1381 err = ipip6_tunnel_create(dev);
1382 if (err < 0)
1383 return err;
1384
1385 #ifdef CONFIG_IPV6_SIT_6RD
1386 if (ipip6_netlink_6rd_parms(data, &ip6rd))
1387 err = ipip6_tunnel_update_6rd(nt, &ip6rd);
1388 #endif
1389
1390 return err;
1391 }
1392
1393 static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[],
1394 struct nlattr *data[])
1395 {
1396 struct ip_tunnel *t;
1397 struct ip_tunnel_parm p;
1398 struct net *net = dev_net(dev);
1399 struct sit_net *sitn = net_generic(net, sit_net_id);
1400 #ifdef CONFIG_IPV6_SIT_6RD
1401 struct ip_tunnel_6rd ip6rd;
1402 #endif
1403
1404 if (dev == sitn->fb_tunnel_dev)
1405 return -EINVAL;
1406
1407 ipip6_netlink_parms(data, &p);
1408
1409 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
1410 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
1411 return -EINVAL;
1412
1413 t = ipip6_tunnel_locate(net, &p, 0);
1414
1415 if (t) {
1416 if (t->dev != dev)
1417 return -EEXIST;
1418 } else
1419 t = netdev_priv(dev);
1420
1421 ipip6_tunnel_update(t, &p);
1422
1423 #ifdef CONFIG_IPV6_SIT_6RD
1424 if (ipip6_netlink_6rd_parms(data, &ip6rd))
1425 return ipip6_tunnel_update_6rd(t, &ip6rd);
1426 #endif
1427
1428 return 0;
1429 }
1430
1431 static size_t ipip6_get_size(const struct net_device *dev)
1432 {
1433 return
1434 /* IFLA_IPTUN_LINK */
1435 nla_total_size(4) +
1436 /* IFLA_IPTUN_LOCAL */
1437 nla_total_size(4) +
1438 /* IFLA_IPTUN_REMOTE */
1439 nla_total_size(4) +
1440 /* IFLA_IPTUN_TTL */
1441 nla_total_size(1) +
1442 /* IFLA_IPTUN_TOS */
1443 nla_total_size(1) +
1444 /* IFLA_IPTUN_PMTUDISC */
1445 nla_total_size(1) +
1446 /* IFLA_IPTUN_FLAGS */
1447 nla_total_size(2) +
1448 #ifdef CONFIG_IPV6_SIT_6RD
1449 /* IFLA_IPTUN_6RD_PREFIX */
1450 nla_total_size(sizeof(struct in6_addr)) +
1451 /* IFLA_IPTUN_6RD_RELAY_PREFIX */
1452 nla_total_size(4) +
1453 /* IFLA_IPTUN_6RD_PREFIXLEN */
1454 nla_total_size(2) +
1455 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */
1456 nla_total_size(2) +
1457 #endif
1458 0;
1459 }
1460
1461 static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev)
1462 {
1463 struct ip_tunnel *tunnel = netdev_priv(dev);
1464 struct ip_tunnel_parm *parm = &tunnel->parms;
1465
1466 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
1467 nla_put_be32(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
1468 nla_put_be32(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
1469 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
1470 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
1471 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
1472 !!(parm->iph.frag_off & htons(IP_DF))) ||
1473 nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags))
1474 goto nla_put_failure;
1475
1476 #ifdef CONFIG_IPV6_SIT_6RD
1477 if (nla_put(skb, IFLA_IPTUN_6RD_PREFIX, sizeof(struct in6_addr),
1478 &tunnel->ip6rd.prefix) ||
1479 nla_put_be32(skb, IFLA_IPTUN_6RD_RELAY_PREFIX,
1480 tunnel->ip6rd.relay_prefix) ||
1481 nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN,
1482 tunnel->ip6rd.prefixlen) ||
1483 nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN,
1484 tunnel->ip6rd.relay_prefixlen))
1485 goto nla_put_failure;
1486 #endif
1487
1488 return 0;
1489
1490 nla_put_failure:
1491 return -EMSGSIZE;
1492 }
1493
1494 static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = {
1495 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
1496 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 },
1497 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 },
1498 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
1499 [IFLA_IPTUN_TOS] = { .type = NLA_U8 },
1500 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 },
1501 [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 },
1502 #ifdef CONFIG_IPV6_SIT_6RD
1503 [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) },
1504 [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 },
1505 [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 },
1506 [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 },
1507 #endif
1508 };
1509
1510 static void ipip6_dellink(struct net_device *dev, struct list_head *head)
1511 {
1512 struct net *net = dev_net(dev);
1513 struct sit_net *sitn = net_generic(net, sit_net_id);
1514
1515 if (dev != sitn->fb_tunnel_dev)
1516 unregister_netdevice_queue(dev, head);
1517 }
1518
1519 static struct rtnl_link_ops sit_link_ops __read_mostly = {
1520 .kind = "sit",
1521 .maxtype = IFLA_IPTUN_MAX,
1522 .policy = ipip6_policy,
1523 .priv_size = sizeof(struct ip_tunnel),
1524 .setup = ipip6_tunnel_setup,
1525 .newlink = ipip6_newlink,
1526 .changelink = ipip6_changelink,
1527 .get_size = ipip6_get_size,
1528 .fill_info = ipip6_fill_info,
1529 .dellink = ipip6_dellink,
1530 };
1531
1532 static struct xfrm_tunnel sit_handler __read_mostly = {
1533 .handler = ipip6_rcv,
1534 .err_handler = ipip6_err,
1535 .priority = 1,
1536 };
1537
1538 static void __net_exit sit_destroy_tunnels(struct sit_net *sitn, struct list_head *head)
1539 {
1540 int prio;
1541
1542 for (prio = 1; prio < 4; prio++) {
1543 int h;
1544 for (h = 0; h < HASH_SIZE; h++) {
1545 struct ip_tunnel *t;
1546
1547 t = rtnl_dereference(sitn->tunnels[prio][h]);
1548 while (t != NULL) {
1549 unregister_netdevice_queue(t->dev, head);
1550 t = rtnl_dereference(t->next);
1551 }
1552 }
1553 }
1554 }
1555
1556 static int __net_init sit_init_net(struct net *net)
1557 {
1558 struct sit_net *sitn = net_generic(net, sit_net_id);
1559 struct ip_tunnel *t;
1560 int err;
1561
1562 sitn->tunnels[0] = sitn->tunnels_wc;
1563 sitn->tunnels[1] = sitn->tunnels_l;
1564 sitn->tunnels[2] = sitn->tunnels_r;
1565 sitn->tunnels[3] = sitn->tunnels_r_l;
1566
1567 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
1568 ipip6_tunnel_setup);
1569 if (!sitn->fb_tunnel_dev) {
1570 err = -ENOMEM;
1571 goto err_alloc_dev;
1572 }
1573 dev_net_set(sitn->fb_tunnel_dev, net);
1574 sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops;
1575
1576 err = ipip6_fb_tunnel_init(sitn->fb_tunnel_dev);
1577 if (err)
1578 goto err_dev_free;
1579
1580 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn);
1581
1582 if ((err = register_netdev(sitn->fb_tunnel_dev)))
1583 goto err_reg_dev;
1584
1585 t = netdev_priv(sitn->fb_tunnel_dev);
1586
1587 strcpy(t->parms.name, sitn->fb_tunnel_dev->name);
1588 return 0;
1589
1590 err_reg_dev:
1591 dev_put(sitn->fb_tunnel_dev);
1592 err_dev_free:
1593 ipip6_dev_free(sitn->fb_tunnel_dev);
1594 err_alloc_dev:
1595 return err;
1596 }
1597
1598 static void __net_exit sit_exit_net(struct net *net)
1599 {
1600 struct sit_net *sitn = net_generic(net, sit_net_id);
1601 LIST_HEAD(list);
1602
1603 rtnl_lock();
1604 sit_destroy_tunnels(sitn, &list);
1605 unregister_netdevice_queue(sitn->fb_tunnel_dev, &list);
1606 unregister_netdevice_many(&list);
1607 rtnl_unlock();
1608 }
1609
1610 static struct pernet_operations sit_net_ops = {
1611 .init = sit_init_net,
1612 .exit = sit_exit_net,
1613 .id = &sit_net_id,
1614 .size = sizeof(struct sit_net),
1615 };
1616
1617 static void __exit sit_cleanup(void)
1618 {
1619 rtnl_link_unregister(&sit_link_ops);
1620 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1621
1622 unregister_pernet_device(&sit_net_ops);
1623 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1624 }
1625
1626 static int __init sit_init(void)
1627 {
1628 int err;
1629
1630 pr_info("IPv6 over IPv4 tunneling driver\n");
1631
1632 err = register_pernet_device(&sit_net_ops);
1633 if (err < 0)
1634 return err;
1635 err = xfrm4_tunnel_register(&sit_handler, AF_INET6);
1636 if (err < 0) {
1637 pr_info("%s: can't add protocol\n", __func__);
1638 goto xfrm_tunnel_failed;
1639 }
1640 err = rtnl_link_register(&sit_link_ops);
1641 if (err < 0)
1642 goto rtnl_link_failed;
1643
1644 out:
1645 return err;
1646
1647 rtnl_link_failed:
1648 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1649 xfrm_tunnel_failed:
1650 unregister_pernet_device(&sit_net_ops);
1651 goto out;
1652 }
1653
1654 module_init(sit_init);
1655 module_exit(sit_cleanup);
1656 MODULE_LICENSE("GPL");
1657 MODULE_ALIAS_RTNL_LINK("sit");
1658 MODULE_ALIAS_NETDEV("sit0");
kernel source for telekom puls (alcatel/mediatek)