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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
68static bool log_ecn_error = true;
69module_param(log_ecn_error, bool, 0644);
70MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
71
72static int ipip6_tunnel_init(struct net_device *dev);
73static void ipip6_tunnel_setup(struct net_device *dev);
74static void ipip6_dev_free(struct net_device *dev);
75static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst,
76 __be32 *v4dst);
77static struct rtnl_link_ops sit_link_ops __read_mostly;
78
79static int sit_net_id __read_mostly;
80struct 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 */
93static 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
126static 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
145static 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
151static 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
166static 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
174static 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
191static 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
218out:
219 return err;
220}
221
222static 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
267failed_free:
268 ipip6_dev_free(dev);
269failed:
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
278static 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
290static 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 }
340out:
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
353static int
354ipip6_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);
391out:
392 return err;
393}
394
395static 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
407static int
408ipip6_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 }
436out:
437 return err;
438}
439
440static int
441isatap_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
467static 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 ip_tunnel_dst_reset_all(tunnel);
479 dev_put(dev);
480}
481
482/* Generate icmpv6 with type/code ICMPV6_DEST_UNREACH/ICMPV6_ADDR_UNREACH
483 * if sufficient data bytes are available
484 */
485static int ipip6_err_gen_icmpv6_unreach(struct sk_buff *skb)
486{
487 const struct iphdr *iph = (const struct iphdr *) skb->data;
488 struct rt6_info *rt;
489 struct sk_buff *skb2;
490
491 if (!pskb_may_pull(skb, iph->ihl * 4 + sizeof(struct ipv6hdr) + 8))
492 return 1;
493
494 skb2 = skb_clone(skb, GFP_ATOMIC);
495
496 if (!skb2)
497 return 1;
498
499 skb_dst_drop(skb2);
500 skb_pull(skb2, iph->ihl * 4);
501 skb_reset_network_header(skb2);
502
503 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, NULL, 0, 0);
504
505 if (rt && rt->dst.dev)
506 skb2->dev = rt->dst.dev;
507
508 icmpv6_send(skb2, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
509
510 if (rt)
511 ip6_rt_put(rt);
512
513 kfree_skb(skb2);
514
515 return 0;
516}
517
518static int ipip6_err(struct sk_buff *skb, u32 info)
519{
520 const struct iphdr *iph = (const struct iphdr *)skb->data;
521 const int type = icmp_hdr(skb)->type;
522 const int code = icmp_hdr(skb)->code;
523 struct ip_tunnel *t;
524 int err;
525
526 switch (type) {
527 default:
528 case ICMP_PARAMETERPROB:
529 return 0;
530
531 case ICMP_DEST_UNREACH:
532 switch (code) {
533 case ICMP_SR_FAILED:
534 /* Impossible event. */
535 return 0;
536 default:
537 /* All others are translated to HOST_UNREACH.
538 rfc2003 contains "deep thoughts" about NET_UNREACH,
539 I believe they are just ether pollution. --ANK
540 */
541 break;
542 }
543 break;
544 case ICMP_TIME_EXCEEDED:
545 if (code != ICMP_EXC_TTL)
546 return 0;
547 break;
548 case ICMP_REDIRECT:
549 break;
550 }
551
552 err = -ENOENT;
553
554 t = ipip6_tunnel_lookup(dev_net(skb->dev),
555 skb->dev,
556 iph->daddr,
557 iph->saddr);
558 if (t == NULL)
559 goto out;
560
561 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
562 ipv4_update_pmtu(skb, dev_net(skb->dev), info,
563 t->dev->ifindex, 0, IPPROTO_IPV6, 0);
564 err = 0;
565 goto out;
566 }
567 if (type == ICMP_REDIRECT) {
568 ipv4_redirect(skb, dev_net(skb->dev), t->dev->ifindex, 0,
569 IPPROTO_IPV6, 0);
570 err = 0;
571 goto out;
572 }
573
574 if (t->parms.iph.daddr == 0)
575 goto out;
576
577 err = 0;
578 if (!ipip6_err_gen_icmpv6_unreach(skb))
579 goto out;
580
581 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
582 goto out;
583
584 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
585 t->err_count++;
586 else
587 t->err_count = 1;
588 t->err_time = jiffies;
589out:
590 return err;
591}
592
593static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr,
594 const struct in6_addr *v6addr)
595{
596 __be32 v4embed = 0;
597 if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed)
598 return true;
599 return false;
600}
601
602/* Checks if an address matches an address on the tunnel interface.
603 * Used to detect the NAT of proto 41 packets and let them pass spoofing test.
604 * Long story:
605 * This function is called after we considered the packet as spoofed
606 * in is_spoofed_6rd.
607 * We may have a router that is doing NAT for proto 41 packets
608 * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb
609 * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd
610 * function will return true, dropping the packet.
611 * But, we can still check if is spoofed against the IP
612 * addresses associated with the interface.
613 */
614static bool only_dnatted(const struct ip_tunnel *tunnel,
615 const struct in6_addr *v6dst)
616{
617 int prefix_len;
618
619#ifdef CONFIG_IPV6_SIT_6RD
620 prefix_len = tunnel->ip6rd.prefixlen + 32
621 - tunnel->ip6rd.relay_prefixlen;
622#else
623 prefix_len = 48;
624#endif
625 return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev);
626}
627
628/* Returns true if a packet is spoofed */
629static bool packet_is_spoofed(struct sk_buff *skb,
630 const struct iphdr *iph,
631 struct ip_tunnel *tunnel)
632{
633 const struct ipv6hdr *ipv6h;
634
635 if (tunnel->dev->priv_flags & IFF_ISATAP) {
636 if (!isatap_chksrc(skb, iph, tunnel))
637 return true;
638
639 return false;
640 }
641
642 if (tunnel->dev->flags & IFF_POINTOPOINT)
643 return false;
644
645 ipv6h = ipv6_hdr(skb);
646
647 if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) {
648 net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n",
649 &iph->saddr, &ipv6h->saddr,
650 &iph->daddr, &ipv6h->daddr);
651 return true;
652 }
653
654 if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr)))
655 return false;
656
657 if (only_dnatted(tunnel, &ipv6h->daddr))
658 return false;
659
660 net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n",
661 &iph->saddr, &ipv6h->saddr,
662 &iph->daddr, &ipv6h->daddr);
663 return true;
664}
665
666static int ipip6_rcv(struct sk_buff *skb)
667{
668 const struct iphdr *iph = ip_hdr(skb);
669 struct ip_tunnel *tunnel;
670 int err;
671
672 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
673 iph->saddr, iph->daddr);
674 if (tunnel != NULL) {
675 struct pcpu_sw_netstats *tstats;
676
677 if (tunnel->parms.iph.protocol != IPPROTO_IPV6 &&
678 tunnel->parms.iph.protocol != 0)
679 goto out;
680
681 skb->mac_header = skb->network_header;
682 skb_reset_network_header(skb);
683 IPCB(skb)->flags = 0;
684 skb->protocol = htons(ETH_P_IPV6);
685
686 if (packet_is_spoofed(skb, iph, tunnel)) {
687 tunnel->dev->stats.rx_errors++;
688 goto out;
689 }
690
691 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
692
693 err = IP_ECN_decapsulate(iph, skb);
694 if (unlikely(err)) {
695 if (log_ecn_error)
696 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
697 &iph->saddr, iph->tos);
698 if (err > 1) {
699 ++tunnel->dev->stats.rx_frame_errors;
700 ++tunnel->dev->stats.rx_errors;
701 goto out;
702 }
703 }
704
705 tstats = this_cpu_ptr(tunnel->dev->tstats);
706 u64_stats_update_begin(&tstats->syncp);
707 tstats->rx_packets++;
708 tstats->rx_bytes += skb->len;
709 u64_stats_update_end(&tstats->syncp);
710
711 netif_rx(skb);
712
713 return 0;
714 }
715
716 /* no tunnel matched, let upstream know, ipsec may handle it */
717 return 1;
718out:
719 kfree_skb(skb);
720 return 0;
721}
722
723static const struct tnl_ptk_info tpi = {
724 /* no tunnel info required for ipip. */
725 .proto = htons(ETH_P_IP),
726};
727
728static int ipip_rcv(struct sk_buff *skb)
729{
730 const struct iphdr *iph;
731 struct ip_tunnel *tunnel;
732
733 iph = ip_hdr(skb);
734 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
735 iph->saddr, iph->daddr);
736 if (tunnel != NULL) {
737 if (tunnel->parms.iph.protocol != IPPROTO_IPIP &&
738 tunnel->parms.iph.protocol != 0)
739 goto drop;
740
741 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
742 goto drop;
743 if (iptunnel_pull_header(skb, 0, tpi.proto))
744 goto drop;
745 return ip_tunnel_rcv(tunnel, skb, &tpi, log_ecn_error);
746 }
747
748 return 1;
749
750drop:
751 kfree_skb(skb);
752 return 0;
753}
754
755/*
756 * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function
757 * stores the embedded IPv4 address in v4dst and returns true.
758 */
759static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst,
760 __be32 *v4dst)
761{
762#ifdef CONFIG_IPV6_SIT_6RD
763 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix,
764 tunnel->ip6rd.prefixlen)) {
765 unsigned int pbw0, pbi0;
766 int pbi1;
767 u32 d;
768
769 pbw0 = tunnel->ip6rd.prefixlen >> 5;
770 pbi0 = tunnel->ip6rd.prefixlen & 0x1f;
771
772 d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >>
773 tunnel->ip6rd.relay_prefixlen;
774
775 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen;
776 if (pbi1 > 0)
777 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >>
778 (32 - pbi1);
779
780 *v4dst = tunnel->ip6rd.relay_prefix | htonl(d);
781 return true;
782 }
783#else
784 if (v6dst->s6_addr16[0] == htons(0x2002)) {
785 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
786 memcpy(v4dst, &v6dst->s6_addr16[1], 4);
787 return true;
788 }
789#endif
790 return false;
791}
792
793static inline __be32 try_6rd(struct ip_tunnel *tunnel,
794 const struct in6_addr *v6dst)
795{
796 __be32 dst = 0;
797 check_6rd(tunnel, v6dst, &dst);
798 return dst;
799}
800
801/*
802 * This function assumes it is being called from dev_queue_xmit()
803 * and that skb is filled properly by that function.
804 */
805
806static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
807 struct net_device *dev)
808{
809 struct ip_tunnel *tunnel = netdev_priv(dev);
810 const struct iphdr *tiph = &tunnel->parms.iph;
811 const struct ipv6hdr *iph6 = ipv6_hdr(skb);
812 u8 tos = tunnel->parms.iph.tos;
813 __be16 df = tiph->frag_off;
814 struct rtable *rt; /* Route to the other host */
815 struct net_device *tdev; /* Device to other host */
816 unsigned int max_headroom; /* The extra header space needed */
817 __be32 dst = tiph->daddr;
818 struct flowi4 fl4;
819 int mtu;
820 const struct in6_addr *addr6;
821 int addr_type;
822 u8 ttl;
823 int err;
824
825 if (skb->protocol != htons(ETH_P_IPV6))
826 goto tx_error;
827
828 if (tos == 1)
829 tos = ipv6_get_dsfield(iph6);
830
831 /* ISATAP (RFC4214) - must come before 6to4 */
832 if (dev->priv_flags & IFF_ISATAP) {
833 struct neighbour *neigh = NULL;
834 bool do_tx_error = false;
835
836 if (skb_dst(skb))
837 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
838
839 if (neigh == NULL) {
840 net_dbg_ratelimited("nexthop == NULL\n");
841 goto tx_error;
842 }
843
844 addr6 = (const struct in6_addr *)&neigh->primary_key;
845 addr_type = ipv6_addr_type(addr6);
846
847 if ((addr_type & IPV6_ADDR_UNICAST) &&
848 ipv6_addr_is_isatap(addr6))
849 dst = addr6->s6_addr32[3];
850 else
851 do_tx_error = true;
852
853 neigh_release(neigh);
854 if (do_tx_error)
855 goto tx_error;
856 }
857
858 if (!dst)
859 dst = try_6rd(tunnel, &iph6->daddr);
860
861 if (!dst) {
862 struct neighbour *neigh = NULL;
863 bool do_tx_error = false;
864
865 if (skb_dst(skb))
866 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
867
868 if (neigh == NULL) {
869 net_dbg_ratelimited("nexthop == NULL\n");
870 goto tx_error;
871 }
872
873 addr6 = (const struct in6_addr *)&neigh->primary_key;
874 addr_type = ipv6_addr_type(addr6);
875
876 if (addr_type == IPV6_ADDR_ANY) {
877 addr6 = &ipv6_hdr(skb)->daddr;
878 addr_type = ipv6_addr_type(addr6);
879 }
880
881 if ((addr_type & IPV6_ADDR_COMPATv4) != 0)
882 dst = addr6->s6_addr32[3];
883 else
884 do_tx_error = true;
885
886 neigh_release(neigh);
887 if (do_tx_error)
888 goto tx_error;
889 }
890
891 rt = ip_route_output_ports(tunnel->net, &fl4, NULL,
892 dst, tiph->saddr,
893 0, 0,
894 IPPROTO_IPV6, RT_TOS(tos),
895 tunnel->parms.link);
896 if (IS_ERR(rt)) {
897 dev->stats.tx_carrier_errors++;
898 goto tx_error_icmp;
899 }
900 if (rt->rt_type != RTN_UNICAST) {
901 ip_rt_put(rt);
902 dev->stats.tx_carrier_errors++;
903 goto tx_error_icmp;
904 }
905 tdev = rt->dst.dev;
906
907 if (tdev == dev) {
908 ip_rt_put(rt);
909 dev->stats.collisions++;
910 goto tx_error;
911 }
912
913 if (df) {
914 mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr);
915
916 if (mtu < 68) {
917 dev->stats.collisions++;
918 ip_rt_put(rt);
919 goto tx_error;
920 }
921
922 if (mtu < IPV6_MIN_MTU) {
923 mtu = IPV6_MIN_MTU;
924 df = 0;
925 }
926
927 if (tunnel->parms.iph.daddr && skb_dst(skb))
928 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
929
930 if (skb->len > mtu && !skb_is_gso(skb)) {
931 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
932 ip_rt_put(rt);
933 goto tx_error;
934 }
935 }
936
937 if (tunnel->err_count > 0) {
938 if (time_before(jiffies,
939 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
940 tunnel->err_count--;
941 dst_link_failure(skb);
942 } else
943 tunnel->err_count = 0;
944 }
945
946 /*
947 * Okay, now see if we can stuff it in the buffer as-is.
948 */
949 max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr);
950
951 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
952 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
953 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
954 if (!new_skb) {
955 ip_rt_put(rt);
956 dev->stats.tx_dropped++;
957 kfree_skb(skb);
958 return NETDEV_TX_OK;
959 }
960 if (skb->sk)
961 skb_set_owner_w(new_skb, skb->sk);
962 dev_kfree_skb(skb);
963 skb = new_skb;
964 iph6 = ipv6_hdr(skb);
965 }
966 ttl = tiph->ttl;
967 if (ttl == 0)
968 ttl = iph6->hop_limit;
969 tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
970
971 skb = iptunnel_handle_offloads(skb, false, SKB_GSO_SIT);
972 if (IS_ERR(skb)) {
973 ip_rt_put(rt);
974 goto out;
975 }
976
977 err = iptunnel_xmit(skb->sk, rt, skb, fl4.saddr, fl4.daddr,
978 IPPROTO_IPV6, tos, ttl, df,
979 !net_eq(tunnel->net, dev_net(dev)));
980 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
981 return NETDEV_TX_OK;
982
983tx_error_icmp:
984 dst_link_failure(skb);
985tx_error:
986 kfree_skb(skb);
987out:
988 dev->stats.tx_errors++;
989 return NETDEV_TX_OK;
990}
991
992static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
993{
994 struct ip_tunnel *tunnel = netdev_priv(dev);
995 const struct iphdr *tiph = &tunnel->parms.iph;
996
997 skb = iptunnel_handle_offloads(skb, false, SKB_GSO_IPIP);
998 if (IS_ERR(skb))
999 goto out;
1000
1001 ip_tunnel_xmit(skb, dev, tiph, IPPROTO_IPIP);
1002 return NETDEV_TX_OK;
1003out:
1004 dev->stats.tx_errors++;
1005 return NETDEV_TX_OK;
1006}
1007
1008static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb,
1009 struct net_device *dev)
1010{
1011 switch (skb->protocol) {
1012 case htons(ETH_P_IP):
1013 ipip_tunnel_xmit(skb, dev);
1014 break;
1015 case htons(ETH_P_IPV6):
1016 ipip6_tunnel_xmit(skb, dev);
1017 break;
1018 default:
1019 goto tx_err;
1020 }
1021
1022 return NETDEV_TX_OK;
1023
1024tx_err:
1025 dev->stats.tx_errors++;
1026 kfree_skb(skb);
1027 return NETDEV_TX_OK;
1028
1029}
1030
1031static void ipip6_tunnel_bind_dev(struct net_device *dev)
1032{
1033 struct net_device *tdev = NULL;
1034 struct ip_tunnel *tunnel;
1035 const struct iphdr *iph;
1036 struct flowi4 fl4;
1037
1038 tunnel = netdev_priv(dev);
1039 iph = &tunnel->parms.iph;
1040
1041 if (iph->daddr) {
1042 struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4,
1043 NULL,
1044 iph->daddr, iph->saddr,
1045 0, 0,
1046 IPPROTO_IPV6,
1047 RT_TOS(iph->tos),
1048 tunnel->parms.link);
1049
1050 if (!IS_ERR(rt)) {
1051 tdev = rt->dst.dev;
1052 ip_rt_put(rt);
1053 }
1054 dev->flags |= IFF_POINTOPOINT;
1055 }
1056
1057 if (!tdev && tunnel->parms.link)
1058 tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link);
1059
1060 if (tdev) {
1061 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
1062 dev->mtu = tdev->mtu - sizeof(struct iphdr);
1063 if (dev->mtu < IPV6_MIN_MTU)
1064 dev->mtu = IPV6_MIN_MTU;
1065 }
1066 dev->iflink = tunnel->parms.link;
1067}
1068
1069static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p)
1070{
1071 struct net *net = t->net;
1072 struct sit_net *sitn = net_generic(net, sit_net_id);
1073
1074 ipip6_tunnel_unlink(sitn, t);
1075 synchronize_net();
1076 t->parms.iph.saddr = p->iph.saddr;
1077 t->parms.iph.daddr = p->iph.daddr;
1078 memcpy(t->dev->dev_addr, &p->iph.saddr, 4);
1079 memcpy(t->dev->broadcast, &p->iph.daddr, 4);
1080 ipip6_tunnel_link(sitn, t);
1081 t->parms.iph.ttl = p->iph.ttl;
1082 t->parms.iph.tos = p->iph.tos;
1083 if (t->parms.link != p->link) {
1084 t->parms.link = p->link;
1085 ipip6_tunnel_bind_dev(t->dev);
1086 }
1087 ip_tunnel_dst_reset_all(t);
1088 netdev_state_change(t->dev);
1089}
1090
1091#ifdef CONFIG_IPV6_SIT_6RD
1092static int ipip6_tunnel_update_6rd(struct ip_tunnel *t,
1093 struct ip_tunnel_6rd *ip6rd)
1094{
1095 struct in6_addr prefix;
1096 __be32 relay_prefix;
1097
1098 if (ip6rd->relay_prefixlen > 32 ||
1099 ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64)
1100 return -EINVAL;
1101
1102 ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen);
1103 if (!ipv6_addr_equal(&prefix, &ip6rd->prefix))
1104 return -EINVAL;
1105 if (ip6rd->relay_prefixlen)
1106 relay_prefix = ip6rd->relay_prefix &
1107 htonl(0xffffffffUL <<
1108 (32 - ip6rd->relay_prefixlen));
1109 else
1110 relay_prefix = 0;
1111 if (relay_prefix != ip6rd->relay_prefix)
1112 return -EINVAL;
1113
1114 t->ip6rd.prefix = prefix;
1115 t->ip6rd.relay_prefix = relay_prefix;
1116 t->ip6rd.prefixlen = ip6rd->prefixlen;
1117 t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen;
1118 ip_tunnel_dst_reset_all(t);
1119 netdev_state_change(t->dev);
1120 return 0;
1121}
1122#endif
1123
1124static int
1125ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
1126{
1127 int err = 0;
1128 struct ip_tunnel_parm p;
1129 struct ip_tunnel_prl prl;
1130 struct ip_tunnel *t = netdev_priv(dev);
1131 struct net *net = t->net;
1132 struct sit_net *sitn = net_generic(net, sit_net_id);
1133#ifdef CONFIG_IPV6_SIT_6RD
1134 struct ip_tunnel_6rd ip6rd;
1135#endif
1136
1137 switch (cmd) {
1138 case SIOCGETTUNNEL:
1139#ifdef CONFIG_IPV6_SIT_6RD
1140 case SIOCGET6RD:
1141#endif
1142 if (dev == sitn->fb_tunnel_dev) {
1143 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1144 err = -EFAULT;
1145 break;
1146 }
1147 t = ipip6_tunnel_locate(net, &p, 0);
1148 if (t == NULL)
1149 t = netdev_priv(dev);
1150 }
1151
1152 err = -EFAULT;
1153 if (cmd == SIOCGETTUNNEL) {
1154 memcpy(&p, &t->parms, sizeof(p));
1155 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p,
1156 sizeof(p)))
1157 goto done;
1158#ifdef CONFIG_IPV6_SIT_6RD
1159 } else {
1160 ip6rd.prefix = t->ip6rd.prefix;
1161 ip6rd.relay_prefix = t->ip6rd.relay_prefix;
1162 ip6rd.prefixlen = t->ip6rd.prefixlen;
1163 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen;
1164 if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd,
1165 sizeof(ip6rd)))
1166 goto done;
1167#endif
1168 }
1169 err = 0;
1170 break;
1171
1172 case SIOCADDTUNNEL:
1173 case SIOCCHGTUNNEL:
1174 err = -EPERM;
1175 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1176 goto done;
1177
1178 err = -EFAULT;
1179 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1180 goto done;
1181
1182 err = -EINVAL;
1183 if (p.iph.protocol != IPPROTO_IPV6 &&
1184 p.iph.protocol != IPPROTO_IPIP &&
1185 p.iph.protocol != 0)
1186 goto done;
1187 if (p.iph.version != 4 ||
1188 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
1189 goto done;
1190 if (p.iph.ttl)
1191 p.iph.frag_off |= htons(IP_DF);
1192
1193 t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
1194
1195 if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1196 if (t != NULL) {
1197 if (t->dev != dev) {
1198 err = -EEXIST;
1199 break;
1200 }
1201 } else {
1202 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
1203 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
1204 err = -EINVAL;
1205 break;
1206 }
1207 t = netdev_priv(dev);
1208 }
1209
1210 ipip6_tunnel_update(t, &p);
1211 }
1212
1213 if (t) {
1214 err = 0;
1215 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
1216 err = -EFAULT;
1217 } else
1218 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1219 break;
1220
1221 case SIOCDELTUNNEL:
1222 err = -EPERM;
1223 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1224 goto done;
1225
1226 if (dev == sitn->fb_tunnel_dev) {
1227 err = -EFAULT;
1228 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1229 goto done;
1230 err = -ENOENT;
1231 if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL)
1232 goto done;
1233 err = -EPERM;
1234 if (t == netdev_priv(sitn->fb_tunnel_dev))
1235 goto done;
1236 dev = t->dev;
1237 }
1238 unregister_netdevice(dev);
1239 err = 0;
1240 break;
1241
1242 case SIOCGETPRL:
1243 err = -EINVAL;
1244 if (dev == sitn->fb_tunnel_dev)
1245 goto done;
1246 err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data);
1247 break;
1248
1249 case SIOCADDPRL:
1250 case SIOCDELPRL:
1251 case SIOCCHGPRL:
1252 err = -EPERM;
1253 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1254 goto done;
1255 err = -EINVAL;
1256 if (dev == sitn->fb_tunnel_dev)
1257 goto done;
1258 err = -EFAULT;
1259 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))
1260 goto done;
1261
1262 switch (cmd) {
1263 case SIOCDELPRL:
1264 err = ipip6_tunnel_del_prl(t, &prl);
1265 break;
1266 case SIOCADDPRL:
1267 case SIOCCHGPRL:
1268 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
1269 break;
1270 }
1271 ip_tunnel_dst_reset_all(t);
1272 netdev_state_change(dev);
1273 break;
1274
1275#ifdef CONFIG_IPV6_SIT_6RD
1276 case SIOCADD6RD:
1277 case SIOCCHG6RD:
1278 case SIOCDEL6RD:
1279 err = -EPERM;
1280 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1281 goto done;
1282
1283 err = -EFAULT;
1284 if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data,
1285 sizeof(ip6rd)))
1286 goto done;
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
1303done:
1304 return err;
1305}
1306
1307static 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
1315static 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
1323static void ipip6_dev_free(struct net_device *dev)
1324{
1325 struct ip_tunnel *tunnel = netdev_priv(dev);
1326
1327 free_percpu(tunnel->dst_cache);
1328 free_percpu(dev->tstats);
1329 free_netdev(dev);
1330}
1331
1332#define SIT_FEATURES (NETIF_F_SG | \
1333 NETIF_F_FRAGLIST | \
1334 NETIF_F_HIGHDMA | \
1335 NETIF_F_GSO_SOFTWARE | \
1336 NETIF_F_HW_CSUM)
1337
1338static void ipip6_tunnel_setup(struct net_device *dev)
1339{
1340 dev->netdev_ops = &ipip6_netdev_ops;
1341 dev->destructor = ipip6_dev_free;
1342
1343 dev->type = ARPHRD_SIT;
1344 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
1345 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr);
1346 dev->flags = IFF_NOARP;
1347 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1348 dev->iflink = 0;
1349 dev->addr_len = 4;
1350 dev->features |= NETIF_F_LLTX;
1351 dev->features |= SIT_FEATURES;
1352 dev->hw_features |= SIT_FEATURES;
1353}
1354
1355static int ipip6_tunnel_init(struct net_device *dev)
1356{
1357 struct ip_tunnel *tunnel = netdev_priv(dev);
1358
1359 tunnel->dev = dev;
1360 tunnel->net = dev_net(dev);
1361
1362 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
1363 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
1364
1365 ipip6_tunnel_bind_dev(dev);
1366 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1367 if (!dev->tstats)
1368 return -ENOMEM;
1369
1370 tunnel->dst_cache = alloc_percpu(struct ip_tunnel_dst);
1371 if (!tunnel->dst_cache) {
1372 free_percpu(dev->tstats);
1373 return -ENOMEM;
1374 }
1375
1376 return 0;
1377}
1378
1379static int __net_init ipip6_fb_tunnel_init(struct net_device *dev)
1380{
1381 struct ip_tunnel *tunnel = netdev_priv(dev);
1382 struct iphdr *iph = &tunnel->parms.iph;
1383 struct net *net = dev_net(dev);
1384 struct sit_net *sitn = net_generic(net, sit_net_id);
1385
1386 tunnel->dev = dev;
1387 tunnel->net = dev_net(dev);
1388 strcpy(tunnel->parms.name, dev->name);
1389
1390 iph->version = 4;
1391 iph->protocol = IPPROTO_IPV6;
1392 iph->ihl = 5;
1393 iph->ttl = 64;
1394
1395 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1396 if (!dev->tstats)
1397 return -ENOMEM;
1398
1399 tunnel->dst_cache = alloc_percpu(struct ip_tunnel_dst);
1400 if (!tunnel->dst_cache) {
1401 free_percpu(dev->tstats);
1402 return -ENOMEM;
1403 }
1404
1405 dev_hold(dev);
1406 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel);
1407 return 0;
1408}
1409
1410static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[])
1411{
1412 u8 proto;
1413
1414 if (!data || !data[IFLA_IPTUN_PROTO])
1415 return 0;
1416
1417 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1418 if (proto != IPPROTO_IPV6 &&
1419 proto != IPPROTO_IPIP &&
1420 proto != 0)
1421 return -EINVAL;
1422
1423 return 0;
1424}
1425
1426static void ipip6_netlink_parms(struct nlattr *data[],
1427 struct ip_tunnel_parm *parms)
1428{
1429 memset(parms, 0, sizeof(*parms));
1430
1431 parms->iph.version = 4;
1432 parms->iph.protocol = IPPROTO_IPV6;
1433 parms->iph.ihl = 5;
1434 parms->iph.ttl = 64;
1435
1436 if (!data)
1437 return;
1438
1439 if (data[IFLA_IPTUN_LINK])
1440 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1441
1442 if (data[IFLA_IPTUN_LOCAL])
1443 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]);
1444
1445 if (data[IFLA_IPTUN_REMOTE])
1446 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]);
1447
1448 if (data[IFLA_IPTUN_TTL]) {
1449 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
1450 if (parms->iph.ttl)
1451 parms->iph.frag_off = htons(IP_DF);
1452 }
1453
1454 if (data[IFLA_IPTUN_TOS])
1455 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
1456
1457 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
1458 parms->iph.frag_off = htons(IP_DF);
1459
1460 if (data[IFLA_IPTUN_FLAGS])
1461 parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]);
1462
1463 if (data[IFLA_IPTUN_PROTO])
1464 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1465
1466}
1467
1468#ifdef CONFIG_IPV6_SIT_6RD
1469/* This function returns true when 6RD attributes are present in the nl msg */
1470static bool ipip6_netlink_6rd_parms(struct nlattr *data[],
1471 struct ip_tunnel_6rd *ip6rd)
1472{
1473 bool ret = false;
1474 memset(ip6rd, 0, sizeof(*ip6rd));
1475
1476 if (!data)
1477 return ret;
1478
1479 if (data[IFLA_IPTUN_6RD_PREFIX]) {
1480 ret = true;
1481 nla_memcpy(&ip6rd->prefix, data[IFLA_IPTUN_6RD_PREFIX],
1482 sizeof(struct in6_addr));
1483 }
1484
1485 if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) {
1486 ret = true;
1487 ip6rd->relay_prefix =
1488 nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]);
1489 }
1490
1491 if (data[IFLA_IPTUN_6RD_PREFIXLEN]) {
1492 ret = true;
1493 ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]);
1494 }
1495
1496 if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) {
1497 ret = true;
1498 ip6rd->relay_prefixlen =
1499 nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
1500 }
1501
1502 return ret;
1503}
1504#endif
1505
1506static int ipip6_newlink(struct net *src_net, struct net_device *dev,
1507 struct nlattr *tb[], struct nlattr *data[])
1508{
1509 struct net *net = dev_net(dev);
1510 struct ip_tunnel *nt;
1511#ifdef CONFIG_IPV6_SIT_6RD
1512 struct ip_tunnel_6rd ip6rd;
1513#endif
1514 int err;
1515
1516 nt = netdev_priv(dev);
1517 ipip6_netlink_parms(data, &nt->parms);
1518
1519 if (ipip6_tunnel_locate(net, &nt->parms, 0))
1520 return -EEXIST;
1521
1522 err = ipip6_tunnel_create(dev);
1523 if (err < 0)
1524 return err;
1525
1526#ifdef CONFIG_IPV6_SIT_6RD
1527 if (ipip6_netlink_6rd_parms(data, &ip6rd))
1528 err = ipip6_tunnel_update_6rd(nt, &ip6rd);
1529#endif
1530
1531 return err;
1532}
1533
1534static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[],
1535 struct nlattr *data[])
1536{
1537 struct ip_tunnel *t = netdev_priv(dev);
1538 struct ip_tunnel_parm p;
1539 struct net *net = t->net;
1540 struct sit_net *sitn = net_generic(net, sit_net_id);
1541#ifdef CONFIG_IPV6_SIT_6RD
1542 struct ip_tunnel_6rd ip6rd;
1543#endif
1544
1545 if (dev == sitn->fb_tunnel_dev)
1546 return -EINVAL;
1547
1548 ipip6_netlink_parms(data, &p);
1549
1550 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
1551 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
1552 return -EINVAL;
1553
1554 t = ipip6_tunnel_locate(net, &p, 0);
1555
1556 if (t) {
1557 if (t->dev != dev)
1558 return -EEXIST;
1559 } else
1560 t = netdev_priv(dev);
1561
1562 ipip6_tunnel_update(t, &p);
1563
1564#ifdef CONFIG_IPV6_SIT_6RD
1565 if (ipip6_netlink_6rd_parms(data, &ip6rd))
1566 return ipip6_tunnel_update_6rd(t, &ip6rd);
1567#endif
1568
1569 return 0;
1570}
1571
1572static size_t ipip6_get_size(const struct net_device *dev)
1573{
1574 return
1575 /* IFLA_IPTUN_LINK */
1576 nla_total_size(4) +
1577 /* IFLA_IPTUN_LOCAL */
1578 nla_total_size(4) +
1579 /* IFLA_IPTUN_REMOTE */
1580 nla_total_size(4) +
1581 /* IFLA_IPTUN_TTL */
1582 nla_total_size(1) +
1583 /* IFLA_IPTUN_TOS */
1584 nla_total_size(1) +
1585 /* IFLA_IPTUN_PMTUDISC */
1586 nla_total_size(1) +
1587 /* IFLA_IPTUN_FLAGS */
1588 nla_total_size(2) +
1589 /* IFLA_IPTUN_PROTO */
1590 nla_total_size(1) +
1591#ifdef CONFIG_IPV6_SIT_6RD
1592 /* IFLA_IPTUN_6RD_PREFIX */
1593 nla_total_size(sizeof(struct in6_addr)) +
1594 /* IFLA_IPTUN_6RD_RELAY_PREFIX */
1595 nla_total_size(4) +
1596 /* IFLA_IPTUN_6RD_PREFIXLEN */
1597 nla_total_size(2) +
1598 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */
1599 nla_total_size(2) +
1600#endif
1601 0;
1602}
1603
1604static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev)
1605{
1606 struct ip_tunnel *tunnel = netdev_priv(dev);
1607 struct ip_tunnel_parm *parm = &tunnel->parms;
1608
1609 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
1610 nla_put_be32(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
1611 nla_put_be32(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
1612 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
1613 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
1614 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
1615 !!(parm->iph.frag_off & htons(IP_DF))) ||
1616 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) ||
1617 nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags))
1618 goto nla_put_failure;
1619
1620#ifdef CONFIG_IPV6_SIT_6RD
1621 if (nla_put(skb, IFLA_IPTUN_6RD_PREFIX, sizeof(struct in6_addr),
1622 &tunnel->ip6rd.prefix) ||
1623 nla_put_be32(skb, IFLA_IPTUN_6RD_RELAY_PREFIX,
1624 tunnel->ip6rd.relay_prefix) ||
1625 nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN,
1626 tunnel->ip6rd.prefixlen) ||
1627 nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN,
1628 tunnel->ip6rd.relay_prefixlen))
1629 goto nla_put_failure;
1630#endif
1631
1632 return 0;
1633
1634nla_put_failure:
1635 return -EMSGSIZE;
1636}
1637
1638static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = {
1639 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
1640 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 },
1641 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 },
1642 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
1643 [IFLA_IPTUN_TOS] = { .type = NLA_U8 },
1644 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 },
1645 [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 },
1646 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
1647#ifdef CONFIG_IPV6_SIT_6RD
1648 [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) },
1649 [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 },
1650 [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 },
1651 [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 },
1652#endif
1653};
1654
1655static void ipip6_dellink(struct net_device *dev, struct list_head *head)
1656{
1657 struct net *net = dev_net(dev);
1658 struct sit_net *sitn = net_generic(net, sit_net_id);
1659
1660 if (dev != sitn->fb_tunnel_dev)
1661 unregister_netdevice_queue(dev, head);
1662}
1663
1664static struct rtnl_link_ops sit_link_ops __read_mostly = {
1665 .kind = "sit",
1666 .maxtype = IFLA_IPTUN_MAX,
1667 .policy = ipip6_policy,
1668 .priv_size = sizeof(struct ip_tunnel),
1669 .setup = ipip6_tunnel_setup,
1670 .validate = ipip6_validate,
1671 .newlink = ipip6_newlink,
1672 .changelink = ipip6_changelink,
1673 .get_size = ipip6_get_size,
1674 .fill_info = ipip6_fill_info,
1675 .dellink = ipip6_dellink,
1676};
1677
1678static struct xfrm_tunnel sit_handler __read_mostly = {
1679 .handler = ipip6_rcv,
1680 .err_handler = ipip6_err,
1681 .priority = 1,
1682};
1683
1684static struct xfrm_tunnel ipip_handler __read_mostly = {
1685 .handler = ipip_rcv,
1686 .err_handler = ipip6_err,
1687 .priority = 2,
1688};
1689
1690static void __net_exit sit_destroy_tunnels(struct net *net,
1691 struct list_head *head)
1692{
1693 struct sit_net *sitn = net_generic(net, sit_net_id);
1694 struct net_device *dev, *aux;
1695 int prio;
1696
1697 for_each_netdev_safe(net, dev, aux)
1698 if (dev->rtnl_link_ops == &sit_link_ops)
1699 unregister_netdevice_queue(dev, head);
1700
1701 for (prio = 1; prio < 4; prio++) {
1702 int h;
1703 for (h = 0; h < HASH_SIZE; h++) {
1704 struct ip_tunnel *t;
1705
1706 t = rtnl_dereference(sitn->tunnels[prio][h]);
1707 while (t != NULL) {
1708 /* If dev is in the same netns, it has already
1709 * been added to the list by the previous loop.
1710 */
1711 if (!net_eq(dev_net(t->dev), net))
1712 unregister_netdevice_queue(t->dev,
1713 head);
1714 t = rtnl_dereference(t->next);
1715 }
1716 }
1717 }
1718}
1719
1720static int __net_init sit_init_net(struct net *net)
1721{
1722 struct sit_net *sitn = net_generic(net, sit_net_id);
1723 struct ip_tunnel *t;
1724 int err;
1725
1726 sitn->tunnels[0] = sitn->tunnels_wc;
1727 sitn->tunnels[1] = sitn->tunnels_l;
1728 sitn->tunnels[2] = sitn->tunnels_r;
1729 sitn->tunnels[3] = sitn->tunnels_r_l;
1730
1731 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
1732 ipip6_tunnel_setup);
1733 if (!sitn->fb_tunnel_dev) {
1734 err = -ENOMEM;
1735 goto err_alloc_dev;
1736 }
1737 dev_net_set(sitn->fb_tunnel_dev, net);
1738 sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops;
1739 /* FB netdevice is special: we have one, and only one per netns.
1740 * Allowing to move it to another netns is clearly unsafe.
1741 */
1742 sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1743
1744 err = ipip6_fb_tunnel_init(sitn->fb_tunnel_dev);
1745 if (err)
1746 goto err_dev_free;
1747
1748 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn);
1749
1750 if ((err = register_netdev(sitn->fb_tunnel_dev)))
1751 goto err_reg_dev;
1752
1753 t = netdev_priv(sitn->fb_tunnel_dev);
1754
1755 strcpy(t->parms.name, sitn->fb_tunnel_dev->name);
1756 return 0;
1757
1758err_reg_dev:
1759 dev_put(sitn->fb_tunnel_dev);
1760err_dev_free:
1761 ipip6_dev_free(sitn->fb_tunnel_dev);
1762err_alloc_dev:
1763 return err;
1764}
1765
1766static void __net_exit sit_exit_net(struct net *net)
1767{
1768 LIST_HEAD(list);
1769
1770 rtnl_lock();
1771 sit_destroy_tunnels(net, &list);
1772 unregister_netdevice_many(&list);
1773 rtnl_unlock();
1774}
1775
1776static struct pernet_operations sit_net_ops = {
1777 .init = sit_init_net,
1778 .exit = sit_exit_net,
1779 .id = &sit_net_id,
1780 .size = sizeof(struct sit_net),
1781};
1782
1783static void __exit sit_cleanup(void)
1784{
1785 rtnl_link_unregister(&sit_link_ops);
1786 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1787 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
1788
1789 unregister_pernet_device(&sit_net_ops);
1790 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1791}
1792
1793static int __init sit_init(void)
1794{
1795 int err;
1796
1797 pr_info("IPv6 over IPv4 tunneling driver\n");
1798
1799 err = register_pernet_device(&sit_net_ops);
1800 if (err < 0)
1801 return err;
1802 err = xfrm4_tunnel_register(&sit_handler, AF_INET6);
1803 if (err < 0) {
1804 pr_info("%s: can't register ip6ip4\n", __func__);
1805 goto xfrm_tunnel_failed;
1806 }
1807 err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
1808 if (err < 0) {
1809 pr_info("%s: can't register ip4ip4\n", __func__);
1810 goto xfrm_tunnel4_failed;
1811 }
1812 err = rtnl_link_register(&sit_link_ops);
1813 if (err < 0)
1814 goto rtnl_link_failed;
1815
1816out:
1817 return err;
1818
1819rtnl_link_failed:
1820 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
1821xfrm_tunnel4_failed:
1822 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1823xfrm_tunnel_failed:
1824 unregister_pernet_device(&sit_net_ops);
1825 goto out;
1826}
1827
1828module_init(sit_init);
1829module_exit(sit_cleanup);
1830MODULE_LICENSE("GPL");
1831MODULE_ALIAS_NETDEV("sit0");
1/*
2 * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT)
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 *
14 * Changes:
15 * Roger Venning <r.venning@telstra.com>: 6to4 support
16 * Nate Thompson <nate@thebog.net>: 6to4 support
17 * Fred Templin <fred.l.templin@boeing.com>: isatap support
18 */
19
20#include <linux/module.h>
21#include <linux/capability.h>
22#include <linux/errno.h>
23#include <linux/types.h>
24#include <linux/socket.h>
25#include <linux/sockios.h>
26#include <linux/net.h>
27#include <linux/in6.h>
28#include <linux/netdevice.h>
29#include <linux/if_arp.h>
30#include <linux/icmp.h>
31#include <linux/slab.h>
32#include <asm/uaccess.h>
33#include <linux/init.h>
34#include <linux/netfilter_ipv4.h>
35#include <linux/if_ether.h>
36
37#include <net/sock.h>
38#include <net/snmp.h>
39
40#include <net/ipv6.h>
41#include <net/protocol.h>
42#include <net/transp_v6.h>
43#include <net/ip6_fib.h>
44#include <net/ip6_route.h>
45#include <net/ndisc.h>
46#include <net/addrconf.h>
47#include <net/ip.h>
48#include <net/udp.h>
49#include <net/icmp.h>
50#include <net/ipip.h>
51#include <net/inet_ecn.h>
52#include <net/xfrm.h>
53#include <net/dsfield.h>
54#include <net/net_namespace.h>
55#include <net/netns/generic.h>
56
57/*
58 This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c
59
60 For comments look at net/ipv4/ip_gre.c --ANK
61 */
62
63#define HASH_SIZE 16
64#define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)
65
66static int ipip6_tunnel_init(struct net_device *dev);
67static void ipip6_tunnel_setup(struct net_device *dev);
68static void ipip6_dev_free(struct net_device *dev);
69
70static int sit_net_id __read_mostly;
71struct sit_net {
72 struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE];
73 struct ip_tunnel __rcu *tunnels_r[HASH_SIZE];
74 struct ip_tunnel __rcu *tunnels_l[HASH_SIZE];
75 struct ip_tunnel __rcu *tunnels_wc[1];
76 struct ip_tunnel __rcu **tunnels[4];
77
78 struct net_device *fb_tunnel_dev;
79};
80
81/*
82 * Locking : hash tables are protected by RCU and RTNL
83 */
84
85#define for_each_ip_tunnel_rcu(start) \
86 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
87
88/* often modified stats are per cpu, other are shared (netdev->stats) */
89struct pcpu_tstats {
90 unsigned long rx_packets;
91 unsigned long rx_bytes;
92 unsigned long tx_packets;
93 unsigned long tx_bytes;
94};
95
96static struct net_device_stats *ipip6_get_stats(struct net_device *dev)
97{
98 struct pcpu_tstats sum = { 0 };
99 int i;
100
101 for_each_possible_cpu(i) {
102 const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i);
103
104 sum.rx_packets += tstats->rx_packets;
105 sum.rx_bytes += tstats->rx_bytes;
106 sum.tx_packets += tstats->tx_packets;
107 sum.tx_bytes += tstats->tx_bytes;
108 }
109 dev->stats.rx_packets = sum.rx_packets;
110 dev->stats.rx_bytes = sum.rx_bytes;
111 dev->stats.tx_packets = sum.tx_packets;
112 dev->stats.tx_bytes = sum.tx_bytes;
113 return &dev->stats;
114}
115/*
116 * Must be invoked with rcu_read_lock
117 */
118static struct ip_tunnel * ipip6_tunnel_lookup(struct net *net,
119 struct net_device *dev, __be32 remote, __be32 local)
120{
121 unsigned int h0 = HASH(remote);
122 unsigned int h1 = HASH(local);
123 struct ip_tunnel *t;
124 struct sit_net *sitn = net_generic(net, sit_net_id);
125
126 for_each_ip_tunnel_rcu(sitn->tunnels_r_l[h0 ^ h1]) {
127 if (local == t->parms.iph.saddr &&
128 remote == t->parms.iph.daddr &&
129 (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
130 (t->dev->flags & IFF_UP))
131 return t;
132 }
133 for_each_ip_tunnel_rcu(sitn->tunnels_r[h0]) {
134 if (remote == t->parms.iph.daddr &&
135 (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
136 (t->dev->flags & IFF_UP))
137 return t;
138 }
139 for_each_ip_tunnel_rcu(sitn->tunnels_l[h1]) {
140 if (local == t->parms.iph.saddr &&
141 (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
142 (t->dev->flags & IFF_UP))
143 return t;
144 }
145 t = rcu_dereference(sitn->tunnels_wc[0]);
146 if ((t != NULL) && (t->dev->flags & IFF_UP))
147 return t;
148 return NULL;
149}
150
151static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn,
152 struct ip_tunnel_parm *parms)
153{
154 __be32 remote = parms->iph.daddr;
155 __be32 local = parms->iph.saddr;
156 unsigned int h = 0;
157 int prio = 0;
158
159 if (remote) {
160 prio |= 2;
161 h ^= HASH(remote);
162 }
163 if (local) {
164 prio |= 1;
165 h ^= HASH(local);
166 }
167 return &sitn->tunnels[prio][h];
168}
169
170static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn,
171 struct ip_tunnel *t)
172{
173 return __ipip6_bucket(sitn, &t->parms);
174}
175
176static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t)
177{
178 struct ip_tunnel __rcu **tp;
179 struct ip_tunnel *iter;
180
181 for (tp = ipip6_bucket(sitn, t);
182 (iter = rtnl_dereference(*tp)) != NULL;
183 tp = &iter->next) {
184 if (t == iter) {
185 rcu_assign_pointer(*tp, t->next);
186 break;
187 }
188 }
189}
190
191static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t)
192{
193 struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t);
194
195 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
196 rcu_assign_pointer(*tp, t);
197}
198
199static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn)
200{
201#ifdef CONFIG_IPV6_SIT_6RD
202 struct ip_tunnel *t = netdev_priv(dev);
203
204 if (t->dev == sitn->fb_tunnel_dev) {
205 ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0);
206 t->ip6rd.relay_prefix = 0;
207 t->ip6rd.prefixlen = 16;
208 t->ip6rd.relay_prefixlen = 0;
209 } else {
210 struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev);
211 memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd));
212 }
213#endif
214}
215
216static struct ip_tunnel *ipip6_tunnel_locate(struct net *net,
217 struct ip_tunnel_parm *parms, int create)
218{
219 __be32 remote = parms->iph.daddr;
220 __be32 local = parms->iph.saddr;
221 struct ip_tunnel *t, *nt;
222 struct ip_tunnel __rcu **tp;
223 struct net_device *dev;
224 char name[IFNAMSIZ];
225 struct sit_net *sitn = net_generic(net, sit_net_id);
226
227 for (tp = __ipip6_bucket(sitn, parms);
228 (t = rtnl_dereference(*tp)) != NULL;
229 tp = &t->next) {
230 if (local == t->parms.iph.saddr &&
231 remote == t->parms.iph.daddr &&
232 parms->link == t->parms.link) {
233 if (create)
234 return NULL;
235 else
236 return t;
237 }
238 }
239 if (!create)
240 goto failed;
241
242 if (parms->name[0])
243 strlcpy(name, parms->name, IFNAMSIZ);
244 else
245 strcpy(name, "sit%d");
246
247 dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup);
248 if (dev == NULL)
249 return NULL;
250
251 dev_net_set(dev, net);
252
253 nt = netdev_priv(dev);
254
255 nt->parms = *parms;
256 if (ipip6_tunnel_init(dev) < 0)
257 goto failed_free;
258 ipip6_tunnel_clone_6rd(dev, sitn);
259
260 if (parms->i_flags & SIT_ISATAP)
261 dev->priv_flags |= IFF_ISATAP;
262
263 if (register_netdevice(dev) < 0)
264 goto failed_free;
265
266 dev_hold(dev);
267
268 ipip6_tunnel_link(sitn, nt);
269 return nt;
270
271failed_free:
272 ipip6_dev_free(dev);
273failed:
274 return NULL;
275}
276
277#define for_each_prl_rcu(start) \
278 for (prl = rcu_dereference(start); \
279 prl; \
280 prl = rcu_dereference(prl->next))
281
282static struct ip_tunnel_prl_entry *
283__ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr)
284{
285 struct ip_tunnel_prl_entry *prl;
286
287 for_each_prl_rcu(t->prl)
288 if (prl->addr == addr)
289 break;
290 return prl;
291
292}
293
294static int ipip6_tunnel_get_prl(struct ip_tunnel *t,
295 struct ip_tunnel_prl __user *a)
296{
297 struct ip_tunnel_prl kprl, *kp;
298 struct ip_tunnel_prl_entry *prl;
299 unsigned int cmax, c = 0, ca, len;
300 int ret = 0;
301
302 if (copy_from_user(&kprl, a, sizeof(kprl)))
303 return -EFAULT;
304 cmax = kprl.datalen / sizeof(kprl);
305 if (cmax > 1 && kprl.addr != htonl(INADDR_ANY))
306 cmax = 1;
307
308 /* For simple GET or for root users,
309 * we try harder to allocate.
310 */
311 kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ?
312 kcalloc(cmax, sizeof(*kp), GFP_KERNEL) :
313 NULL;
314
315 rcu_read_lock();
316
317 ca = t->prl_count < cmax ? t->prl_count : cmax;
318
319 if (!kp) {
320 /* We don't try hard to allocate much memory for
321 * non-root users.
322 * For root users, retry allocating enough memory for
323 * the answer.
324 */
325 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC);
326 if (!kp) {
327 ret = -ENOMEM;
328 goto out;
329 }
330 }
331
332 c = 0;
333 for_each_prl_rcu(t->prl) {
334 if (c >= cmax)
335 break;
336 if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr)
337 continue;
338 kp[c].addr = prl->addr;
339 kp[c].flags = prl->flags;
340 c++;
341 if (kprl.addr != htonl(INADDR_ANY))
342 break;
343 }
344out:
345 rcu_read_unlock();
346
347 len = sizeof(*kp) * c;
348 ret = 0;
349 if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen))
350 ret = -EFAULT;
351
352 kfree(kp);
353
354 return ret;
355}
356
357static int
358ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg)
359{
360 struct ip_tunnel_prl_entry *p;
361 int err = 0;
362
363 if (a->addr == htonl(INADDR_ANY))
364 return -EINVAL;
365
366 ASSERT_RTNL();
367
368 for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) {
369 if (p->addr == a->addr) {
370 if (chg) {
371 p->flags = a->flags;
372 goto out;
373 }
374 err = -EEXIST;
375 goto out;
376 }
377 }
378
379 if (chg) {
380 err = -ENXIO;
381 goto out;
382 }
383
384 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL);
385 if (!p) {
386 err = -ENOBUFS;
387 goto out;
388 }
389
390 p->next = t->prl;
391 p->addr = a->addr;
392 p->flags = a->flags;
393 t->prl_count++;
394 rcu_assign_pointer(t->prl, p);
395out:
396 return err;
397}
398
399static void prl_list_destroy_rcu(struct rcu_head *head)
400{
401 struct ip_tunnel_prl_entry *p, *n;
402
403 p = container_of(head, struct ip_tunnel_prl_entry, rcu_head);
404 do {
405 n = rcu_dereference_protected(p->next, 1);
406 kfree(p);
407 p = n;
408 } while (p);
409}
410
411static int
412ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
413{
414 struct ip_tunnel_prl_entry *x;
415 struct ip_tunnel_prl_entry __rcu **p;
416 int err = 0;
417
418 ASSERT_RTNL();
419
420 if (a && a->addr != htonl(INADDR_ANY)) {
421 for (p = &t->prl;
422 (x = rtnl_dereference(*p)) != NULL;
423 p = &x->next) {
424 if (x->addr == a->addr) {
425 *p = x->next;
426 kfree_rcu(x, rcu_head);
427 t->prl_count--;
428 goto out;
429 }
430 }
431 err = -ENXIO;
432 } else {
433 x = rtnl_dereference(t->prl);
434 if (x) {
435 t->prl_count = 0;
436 call_rcu(&x->rcu_head, prl_list_destroy_rcu);
437 t->prl = NULL;
438 }
439 }
440out:
441 return err;
442}
443
444static int
445isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t)
446{
447 struct ip_tunnel_prl_entry *p;
448 int ok = 1;
449
450 rcu_read_lock();
451 p = __ipip6_tunnel_locate_prl(t, iph->saddr);
452 if (p) {
453 if (p->flags & PRL_DEFAULT)
454 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT;
455 else
456 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT;
457 } else {
458 const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr;
459
460 if (ipv6_addr_is_isatap(addr6) &&
461 (addr6->s6_addr32[3] == iph->saddr) &&
462 ipv6_chk_prefix(addr6, t->dev))
463 skb->ndisc_nodetype = NDISC_NODETYPE_HOST;
464 else
465 ok = 0;
466 }
467 rcu_read_unlock();
468 return ok;
469}
470
471static void ipip6_tunnel_uninit(struct net_device *dev)
472{
473 struct net *net = dev_net(dev);
474 struct sit_net *sitn = net_generic(net, sit_net_id);
475
476 if (dev == sitn->fb_tunnel_dev) {
477 rcu_assign_pointer(sitn->tunnels_wc[0], NULL);
478 } else {
479 ipip6_tunnel_unlink(sitn, netdev_priv(dev));
480 ipip6_tunnel_del_prl(netdev_priv(dev), NULL);
481 }
482 dev_put(dev);
483}
484
485
486static int ipip6_err(struct sk_buff *skb, u32 info)
487{
488
489/* All the routers (except for Linux) return only
490 8 bytes of packet payload. It means, that precise relaying of
491 ICMP in the real Internet is absolutely infeasible.
492 */
493 const struct iphdr *iph = (const struct iphdr *)skb->data;
494 const int type = icmp_hdr(skb)->type;
495 const int code = icmp_hdr(skb)->code;
496 struct ip_tunnel *t;
497 int err;
498
499 switch (type) {
500 default:
501 case ICMP_PARAMETERPROB:
502 return 0;
503
504 case ICMP_DEST_UNREACH:
505 switch (code) {
506 case ICMP_SR_FAILED:
507 case ICMP_PORT_UNREACH:
508 /* Impossible event. */
509 return 0;
510 case ICMP_FRAG_NEEDED:
511 /* Soft state for pmtu is maintained by IP core. */
512 return 0;
513 default:
514 /* All others are translated to HOST_UNREACH.
515 rfc2003 contains "deep thoughts" about NET_UNREACH,
516 I believe they are just ether pollution. --ANK
517 */
518 break;
519 }
520 break;
521 case ICMP_TIME_EXCEEDED:
522 if (code != ICMP_EXC_TTL)
523 return 0;
524 break;
525 }
526
527 err = -ENOENT;
528
529 rcu_read_lock();
530 t = ipip6_tunnel_lookup(dev_net(skb->dev),
531 skb->dev,
532 iph->daddr,
533 iph->saddr);
534 if (t == NULL || t->parms.iph.daddr == 0)
535 goto out;
536
537 err = 0;
538 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
539 goto out;
540
541 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
542 t->err_count++;
543 else
544 t->err_count = 1;
545 t->err_time = jiffies;
546out:
547 rcu_read_unlock();
548 return err;
549}
550
551static inline void ipip6_ecn_decapsulate(const struct iphdr *iph, struct sk_buff *skb)
552{
553 if (INET_ECN_is_ce(iph->tos))
554 IP6_ECN_set_ce(ipv6_hdr(skb));
555}
556
557static int ipip6_rcv(struct sk_buff *skb)
558{
559 const struct iphdr *iph;
560 struct ip_tunnel *tunnel;
561
562 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
563 goto out;
564
565 iph = ip_hdr(skb);
566
567 rcu_read_lock();
568 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
569 iph->saddr, iph->daddr);
570 if (tunnel != NULL) {
571 struct pcpu_tstats *tstats;
572
573 secpath_reset(skb);
574 skb->mac_header = skb->network_header;
575 skb_reset_network_header(skb);
576 IPCB(skb)->flags = 0;
577 skb->protocol = htons(ETH_P_IPV6);
578 skb->pkt_type = PACKET_HOST;
579
580 if ((tunnel->dev->priv_flags & IFF_ISATAP) &&
581 !isatap_chksrc(skb, iph, tunnel)) {
582 tunnel->dev->stats.rx_errors++;
583 rcu_read_unlock();
584 kfree_skb(skb);
585 return 0;
586 }
587
588 tstats = this_cpu_ptr(tunnel->dev->tstats);
589 tstats->rx_packets++;
590 tstats->rx_bytes += skb->len;
591
592 __skb_tunnel_rx(skb, tunnel->dev);
593
594 ipip6_ecn_decapsulate(iph, skb);
595
596 netif_rx(skb);
597
598 rcu_read_unlock();
599 return 0;
600 }
601
602 /* no tunnel matched, let upstream know, ipsec may handle it */
603 rcu_read_unlock();
604 return 1;
605out:
606 kfree_skb(skb);
607 return 0;
608}
609
610/*
611 * Returns the embedded IPv4 address if the IPv6 address
612 * comes from 6rd / 6to4 (RFC 3056) addr space.
613 */
614static inline
615__be32 try_6rd(const struct in6_addr *v6dst, struct ip_tunnel *tunnel)
616{
617 __be32 dst = 0;
618
619#ifdef CONFIG_IPV6_SIT_6RD
620 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix,
621 tunnel->ip6rd.prefixlen)) {
622 unsigned int pbw0, pbi0;
623 int pbi1;
624 u32 d;
625
626 pbw0 = tunnel->ip6rd.prefixlen >> 5;
627 pbi0 = tunnel->ip6rd.prefixlen & 0x1f;
628
629 d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >>
630 tunnel->ip6rd.relay_prefixlen;
631
632 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen;
633 if (pbi1 > 0)
634 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >>
635 (32 - pbi1);
636
637 dst = tunnel->ip6rd.relay_prefix | htonl(d);
638 }
639#else
640 if (v6dst->s6_addr16[0] == htons(0x2002)) {
641 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
642 memcpy(&dst, &v6dst->s6_addr16[1], 4);
643 }
644#endif
645 return dst;
646}
647
648/*
649 * This function assumes it is being called from dev_queue_xmit()
650 * and that skb is filled properly by that function.
651 */
652
653static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
654 struct net_device *dev)
655{
656 struct ip_tunnel *tunnel = netdev_priv(dev);
657 struct pcpu_tstats *tstats;
658 const struct iphdr *tiph = &tunnel->parms.iph;
659 const struct ipv6hdr *iph6 = ipv6_hdr(skb);
660 u8 tos = tunnel->parms.iph.tos;
661 __be16 df = tiph->frag_off;
662 struct rtable *rt; /* Route to the other host */
663 struct net_device *tdev; /* Device to other host */
664 struct iphdr *iph; /* Our new IP header */
665 unsigned int max_headroom; /* The extra header space needed */
666 __be32 dst = tiph->daddr;
667 struct flowi4 fl4;
668 int mtu;
669 const struct in6_addr *addr6;
670 int addr_type;
671
672 if (skb->protocol != htons(ETH_P_IPV6))
673 goto tx_error;
674
675 if (tos == 1)
676 tos = ipv6_get_dsfield(iph6);
677
678 /* ISATAP (RFC4214) - must come before 6to4 */
679 if (dev->priv_flags & IFF_ISATAP) {
680 struct neighbour *neigh = NULL;
681
682 if (skb_dst(skb))
683 neigh = dst_get_neighbour(skb_dst(skb));
684
685 if (neigh == NULL) {
686 if (net_ratelimit())
687 printk(KERN_DEBUG "sit: nexthop == NULL\n");
688 goto tx_error;
689 }
690
691 addr6 = (const struct in6_addr*)&neigh->primary_key;
692 addr_type = ipv6_addr_type(addr6);
693
694 if ((addr_type & IPV6_ADDR_UNICAST) &&
695 ipv6_addr_is_isatap(addr6))
696 dst = addr6->s6_addr32[3];
697 else
698 goto tx_error;
699 }
700
701 if (!dst)
702 dst = try_6rd(&iph6->daddr, tunnel);
703
704 if (!dst) {
705 struct neighbour *neigh = NULL;
706
707 if (skb_dst(skb))
708 neigh = dst_get_neighbour(skb_dst(skb));
709
710 if (neigh == NULL) {
711 if (net_ratelimit())
712 printk(KERN_DEBUG "sit: nexthop == NULL\n");
713 goto tx_error;
714 }
715
716 addr6 = (const struct in6_addr*)&neigh->primary_key;
717 addr_type = ipv6_addr_type(addr6);
718
719 if (addr_type == IPV6_ADDR_ANY) {
720 addr6 = &ipv6_hdr(skb)->daddr;
721 addr_type = ipv6_addr_type(addr6);
722 }
723
724 if ((addr_type & IPV6_ADDR_COMPATv4) == 0)
725 goto tx_error_icmp;
726
727 dst = addr6->s6_addr32[3];
728 }
729
730 rt = ip_route_output_ports(dev_net(dev), &fl4, NULL,
731 dst, tiph->saddr,
732 0, 0,
733 IPPROTO_IPV6, RT_TOS(tos),
734 tunnel->parms.link);
735 if (IS_ERR(rt)) {
736 dev->stats.tx_carrier_errors++;
737 goto tx_error_icmp;
738 }
739 if (rt->rt_type != RTN_UNICAST) {
740 ip_rt_put(rt);
741 dev->stats.tx_carrier_errors++;
742 goto tx_error_icmp;
743 }
744 tdev = rt->dst.dev;
745
746 if (tdev == dev) {
747 ip_rt_put(rt);
748 dev->stats.collisions++;
749 goto tx_error;
750 }
751
752 if (df) {
753 mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr);
754
755 if (mtu < 68) {
756 dev->stats.collisions++;
757 ip_rt_put(rt);
758 goto tx_error;
759 }
760
761 if (mtu < IPV6_MIN_MTU) {
762 mtu = IPV6_MIN_MTU;
763 df = 0;
764 }
765
766 if (tunnel->parms.iph.daddr && skb_dst(skb))
767 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu);
768
769 if (skb->len > mtu) {
770 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
771 ip_rt_put(rt);
772 goto tx_error;
773 }
774 }
775
776 if (tunnel->err_count > 0) {
777 if (time_before(jiffies,
778 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
779 tunnel->err_count--;
780 dst_link_failure(skb);
781 } else
782 tunnel->err_count = 0;
783 }
784
785 /*
786 * Okay, now see if we can stuff it in the buffer as-is.
787 */
788 max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr);
789
790 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
791 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
792 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
793 if (!new_skb) {
794 ip_rt_put(rt);
795 dev->stats.tx_dropped++;
796 dev_kfree_skb(skb);
797 return NETDEV_TX_OK;
798 }
799 if (skb->sk)
800 skb_set_owner_w(new_skb, skb->sk);
801 dev_kfree_skb(skb);
802 skb = new_skb;
803 iph6 = ipv6_hdr(skb);
804 }
805
806 skb->transport_header = skb->network_header;
807 skb_push(skb, sizeof(struct iphdr));
808 skb_reset_network_header(skb);
809 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
810 IPCB(skb)->flags = 0;
811 skb_dst_drop(skb);
812 skb_dst_set(skb, &rt->dst);
813
814 /*
815 * Push down and install the IPIP header.
816 */
817
818 iph = ip_hdr(skb);
819 iph->version = 4;
820 iph->ihl = sizeof(struct iphdr)>>2;
821 iph->frag_off = df;
822 iph->protocol = IPPROTO_IPV6;
823 iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
824 iph->daddr = fl4.daddr;
825 iph->saddr = fl4.saddr;
826
827 if ((iph->ttl = tiph->ttl) == 0)
828 iph->ttl = iph6->hop_limit;
829
830 nf_reset(skb);
831 tstats = this_cpu_ptr(dev->tstats);
832 __IPTUNNEL_XMIT(tstats, &dev->stats);
833 return NETDEV_TX_OK;
834
835tx_error_icmp:
836 dst_link_failure(skb);
837tx_error:
838 dev->stats.tx_errors++;
839 dev_kfree_skb(skb);
840 return NETDEV_TX_OK;
841}
842
843static void ipip6_tunnel_bind_dev(struct net_device *dev)
844{
845 struct net_device *tdev = NULL;
846 struct ip_tunnel *tunnel;
847 const struct iphdr *iph;
848 struct flowi4 fl4;
849
850 tunnel = netdev_priv(dev);
851 iph = &tunnel->parms.iph;
852
853 if (iph->daddr) {
854 struct rtable *rt = ip_route_output_ports(dev_net(dev), &fl4, NULL,
855 iph->daddr, iph->saddr,
856 0, 0,
857 IPPROTO_IPV6,
858 RT_TOS(iph->tos),
859 tunnel->parms.link);
860
861 if (!IS_ERR(rt)) {
862 tdev = rt->dst.dev;
863 ip_rt_put(rt);
864 }
865 dev->flags |= IFF_POINTOPOINT;
866 }
867
868 if (!tdev && tunnel->parms.link)
869 tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link);
870
871 if (tdev) {
872 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
873 dev->mtu = tdev->mtu - sizeof(struct iphdr);
874 if (dev->mtu < IPV6_MIN_MTU)
875 dev->mtu = IPV6_MIN_MTU;
876 }
877 dev->iflink = tunnel->parms.link;
878}
879
880static int
881ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
882{
883 int err = 0;
884 struct ip_tunnel_parm p;
885 struct ip_tunnel_prl prl;
886 struct ip_tunnel *t;
887 struct net *net = dev_net(dev);
888 struct sit_net *sitn = net_generic(net, sit_net_id);
889#ifdef CONFIG_IPV6_SIT_6RD
890 struct ip_tunnel_6rd ip6rd;
891#endif
892
893 switch (cmd) {
894 case SIOCGETTUNNEL:
895#ifdef CONFIG_IPV6_SIT_6RD
896 case SIOCGET6RD:
897#endif
898 t = NULL;
899 if (dev == sitn->fb_tunnel_dev) {
900 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
901 err = -EFAULT;
902 break;
903 }
904 t = ipip6_tunnel_locate(net, &p, 0);
905 }
906 if (t == NULL)
907 t = netdev_priv(dev);
908
909 err = -EFAULT;
910 if (cmd == SIOCGETTUNNEL) {
911 memcpy(&p, &t->parms, sizeof(p));
912 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p,
913 sizeof(p)))
914 goto done;
915#ifdef CONFIG_IPV6_SIT_6RD
916 } else {
917 ipv6_addr_copy(&ip6rd.prefix, &t->ip6rd.prefix);
918 ip6rd.relay_prefix = t->ip6rd.relay_prefix;
919 ip6rd.prefixlen = t->ip6rd.prefixlen;
920 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen;
921 if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd,
922 sizeof(ip6rd)))
923 goto done;
924#endif
925 }
926 err = 0;
927 break;
928
929 case SIOCADDTUNNEL:
930 case SIOCCHGTUNNEL:
931 err = -EPERM;
932 if (!capable(CAP_NET_ADMIN))
933 goto done;
934
935 err = -EFAULT;
936 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
937 goto done;
938
939 err = -EINVAL;
940 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 ||
941 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
942 goto done;
943 if (p.iph.ttl)
944 p.iph.frag_off |= htons(IP_DF);
945
946 t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
947
948 if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
949 if (t != NULL) {
950 if (t->dev != dev) {
951 err = -EEXIST;
952 break;
953 }
954 } else {
955 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
956 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
957 err = -EINVAL;
958 break;
959 }
960 t = netdev_priv(dev);
961 ipip6_tunnel_unlink(sitn, t);
962 synchronize_net();
963 t->parms.iph.saddr = p.iph.saddr;
964 t->parms.iph.daddr = p.iph.daddr;
965 memcpy(dev->dev_addr, &p.iph.saddr, 4);
966 memcpy(dev->broadcast, &p.iph.daddr, 4);
967 ipip6_tunnel_link(sitn, t);
968 netdev_state_change(dev);
969 }
970 }
971
972 if (t) {
973 err = 0;
974 if (cmd == SIOCCHGTUNNEL) {
975 t->parms.iph.ttl = p.iph.ttl;
976 t->parms.iph.tos = p.iph.tos;
977 if (t->parms.link != p.link) {
978 t->parms.link = p.link;
979 ipip6_tunnel_bind_dev(dev);
980 netdev_state_change(dev);
981 }
982 }
983 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
984 err = -EFAULT;
985 } else
986 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
987 break;
988
989 case SIOCDELTUNNEL:
990 err = -EPERM;
991 if (!capable(CAP_NET_ADMIN))
992 goto done;
993
994 if (dev == sitn->fb_tunnel_dev) {
995 err = -EFAULT;
996 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
997 goto done;
998 err = -ENOENT;
999 if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL)
1000 goto done;
1001 err = -EPERM;
1002 if (t == netdev_priv(sitn->fb_tunnel_dev))
1003 goto done;
1004 dev = t->dev;
1005 }
1006 unregister_netdevice(dev);
1007 err = 0;
1008 break;
1009
1010 case SIOCGETPRL:
1011 err = -EINVAL;
1012 if (dev == sitn->fb_tunnel_dev)
1013 goto done;
1014 err = -ENOENT;
1015 if (!(t = netdev_priv(dev)))
1016 goto done;
1017 err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data);
1018 break;
1019
1020 case SIOCADDPRL:
1021 case SIOCDELPRL:
1022 case SIOCCHGPRL:
1023 err = -EPERM;
1024 if (!capable(CAP_NET_ADMIN))
1025 goto done;
1026 err = -EINVAL;
1027 if (dev == sitn->fb_tunnel_dev)
1028 goto done;
1029 err = -EFAULT;
1030 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))
1031 goto done;
1032 err = -ENOENT;
1033 if (!(t = netdev_priv(dev)))
1034 goto done;
1035
1036 switch (cmd) {
1037 case SIOCDELPRL:
1038 err = ipip6_tunnel_del_prl(t, &prl);
1039 break;
1040 case SIOCADDPRL:
1041 case SIOCCHGPRL:
1042 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
1043 break;
1044 }
1045 netdev_state_change(dev);
1046 break;
1047
1048#ifdef CONFIG_IPV6_SIT_6RD
1049 case SIOCADD6RD:
1050 case SIOCCHG6RD:
1051 case SIOCDEL6RD:
1052 err = -EPERM;
1053 if (!capable(CAP_NET_ADMIN))
1054 goto done;
1055
1056 err = -EFAULT;
1057 if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data,
1058 sizeof(ip6rd)))
1059 goto done;
1060
1061 t = netdev_priv(dev);
1062
1063 if (cmd != SIOCDEL6RD) {
1064 struct in6_addr prefix;
1065 __be32 relay_prefix;
1066
1067 err = -EINVAL;
1068 if (ip6rd.relay_prefixlen > 32 ||
1069 ip6rd.prefixlen + (32 - ip6rd.relay_prefixlen) > 64)
1070 goto done;
1071
1072 ipv6_addr_prefix(&prefix, &ip6rd.prefix,
1073 ip6rd.prefixlen);
1074 if (!ipv6_addr_equal(&prefix, &ip6rd.prefix))
1075 goto done;
1076 if (ip6rd.relay_prefixlen)
1077 relay_prefix = ip6rd.relay_prefix &
1078 htonl(0xffffffffUL <<
1079 (32 - ip6rd.relay_prefixlen));
1080 else
1081 relay_prefix = 0;
1082 if (relay_prefix != ip6rd.relay_prefix)
1083 goto done;
1084
1085 ipv6_addr_copy(&t->ip6rd.prefix, &prefix);
1086 t->ip6rd.relay_prefix = relay_prefix;
1087 t->ip6rd.prefixlen = ip6rd.prefixlen;
1088 t->ip6rd.relay_prefixlen = ip6rd.relay_prefixlen;
1089 } else
1090 ipip6_tunnel_clone_6rd(dev, sitn);
1091
1092 err = 0;
1093 break;
1094#endif
1095
1096 default:
1097 err = -EINVAL;
1098 }
1099
1100done:
1101 return err;
1102}
1103
1104static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1105{
1106 if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr))
1107 return -EINVAL;
1108 dev->mtu = new_mtu;
1109 return 0;
1110}
1111
1112static const struct net_device_ops ipip6_netdev_ops = {
1113 .ndo_uninit = ipip6_tunnel_uninit,
1114 .ndo_start_xmit = ipip6_tunnel_xmit,
1115 .ndo_do_ioctl = ipip6_tunnel_ioctl,
1116 .ndo_change_mtu = ipip6_tunnel_change_mtu,
1117 .ndo_get_stats = ipip6_get_stats,
1118};
1119
1120static void ipip6_dev_free(struct net_device *dev)
1121{
1122 free_percpu(dev->tstats);
1123 free_netdev(dev);
1124}
1125
1126static void ipip6_tunnel_setup(struct net_device *dev)
1127{
1128 dev->netdev_ops = &ipip6_netdev_ops;
1129 dev->destructor = ipip6_dev_free;
1130
1131 dev->type = ARPHRD_SIT;
1132 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
1133 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr);
1134 dev->flags = IFF_NOARP;
1135 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1136 dev->iflink = 0;
1137 dev->addr_len = 4;
1138 dev->features |= NETIF_F_NETNS_LOCAL;
1139 dev->features |= NETIF_F_LLTX;
1140}
1141
1142static int ipip6_tunnel_init(struct net_device *dev)
1143{
1144 struct ip_tunnel *tunnel = netdev_priv(dev);
1145
1146 tunnel->dev = dev;
1147 strcpy(tunnel->parms.name, dev->name);
1148
1149 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
1150 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
1151
1152 ipip6_tunnel_bind_dev(dev);
1153 dev->tstats = alloc_percpu(struct pcpu_tstats);
1154 if (!dev->tstats)
1155 return -ENOMEM;
1156
1157 return 0;
1158}
1159
1160static int __net_init ipip6_fb_tunnel_init(struct net_device *dev)
1161{
1162 struct ip_tunnel *tunnel = netdev_priv(dev);
1163 struct iphdr *iph = &tunnel->parms.iph;
1164 struct net *net = dev_net(dev);
1165 struct sit_net *sitn = net_generic(net, sit_net_id);
1166
1167 tunnel->dev = dev;
1168 strcpy(tunnel->parms.name, dev->name);
1169
1170 iph->version = 4;
1171 iph->protocol = IPPROTO_IPV6;
1172 iph->ihl = 5;
1173 iph->ttl = 64;
1174
1175 dev->tstats = alloc_percpu(struct pcpu_tstats);
1176 if (!dev->tstats)
1177 return -ENOMEM;
1178 dev_hold(dev);
1179 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel);
1180 return 0;
1181}
1182
1183static struct xfrm_tunnel sit_handler __read_mostly = {
1184 .handler = ipip6_rcv,
1185 .err_handler = ipip6_err,
1186 .priority = 1,
1187};
1188
1189static void __net_exit sit_destroy_tunnels(struct sit_net *sitn, struct list_head *head)
1190{
1191 int prio;
1192
1193 for (prio = 1; prio < 4; prio++) {
1194 int h;
1195 for (h = 0; h < HASH_SIZE; h++) {
1196 struct ip_tunnel *t;
1197
1198 t = rtnl_dereference(sitn->tunnels[prio][h]);
1199 while (t != NULL) {
1200 unregister_netdevice_queue(t->dev, head);
1201 t = rtnl_dereference(t->next);
1202 }
1203 }
1204 }
1205}
1206
1207static int __net_init sit_init_net(struct net *net)
1208{
1209 struct sit_net *sitn = net_generic(net, sit_net_id);
1210 int err;
1211
1212 sitn->tunnels[0] = sitn->tunnels_wc;
1213 sitn->tunnels[1] = sitn->tunnels_l;
1214 sitn->tunnels[2] = sitn->tunnels_r;
1215 sitn->tunnels[3] = sitn->tunnels_r_l;
1216
1217 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
1218 ipip6_tunnel_setup);
1219 if (!sitn->fb_tunnel_dev) {
1220 err = -ENOMEM;
1221 goto err_alloc_dev;
1222 }
1223 dev_net_set(sitn->fb_tunnel_dev, net);
1224
1225 err = ipip6_fb_tunnel_init(sitn->fb_tunnel_dev);
1226 if (err)
1227 goto err_dev_free;
1228
1229 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn);
1230
1231 if ((err = register_netdev(sitn->fb_tunnel_dev)))
1232 goto err_reg_dev;
1233
1234 return 0;
1235
1236err_reg_dev:
1237 dev_put(sitn->fb_tunnel_dev);
1238err_dev_free:
1239 ipip6_dev_free(sitn->fb_tunnel_dev);
1240err_alloc_dev:
1241 return err;
1242}
1243
1244static void __net_exit sit_exit_net(struct net *net)
1245{
1246 struct sit_net *sitn = net_generic(net, sit_net_id);
1247 LIST_HEAD(list);
1248
1249 rtnl_lock();
1250 sit_destroy_tunnels(sitn, &list);
1251 unregister_netdevice_queue(sitn->fb_tunnel_dev, &list);
1252 unregister_netdevice_many(&list);
1253 rtnl_unlock();
1254}
1255
1256static struct pernet_operations sit_net_ops = {
1257 .init = sit_init_net,
1258 .exit = sit_exit_net,
1259 .id = &sit_net_id,
1260 .size = sizeof(struct sit_net),
1261};
1262
1263static void __exit sit_cleanup(void)
1264{
1265 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1266
1267 unregister_pernet_device(&sit_net_ops);
1268 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1269}
1270
1271static int __init sit_init(void)
1272{
1273 int err;
1274
1275 printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n");
1276
1277 err = register_pernet_device(&sit_net_ops);
1278 if (err < 0)
1279 return err;
1280 err = xfrm4_tunnel_register(&sit_handler, AF_INET6);
1281 if (err < 0) {
1282 unregister_pernet_device(&sit_net_ops);
1283 printk(KERN_INFO "sit init: Can't add protocol\n");
1284 }
1285 return err;
1286}
1287
1288module_init(sit_init);
1289module_exit(sit_cleanup);
1290MODULE_LICENSE("GPL");
1291MODULE_ALIAS_NETDEV("sit0");