1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21#include <linux/config.h>
22#include <linux/module.h>
23#include <linux/errno.h>
24#include <linux/types.h>
25#include <linux/socket.h>
26#include <linux/sockios.h>
27#include <linux/sched.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 <asm/uaccess.h>
34#include <linux/init.h>
35#include <linux/netfilter_ipv4.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
53
54
55
56
57
58
59#define HASH_SIZE 16
60#define HASH(addr) ((addr^(addr>>4))&0xF)
61
62static int ipip6_fb_tunnel_init(struct net_device *dev);
63static int ipip6_tunnel_init(struct net_device *dev);
64
65static struct net_device ipip6_fb_tunnel_dev = {
66 name: "sit0",
67 init: ipip6_fb_tunnel_init,
68};
69
70static struct ip_tunnel ipip6_fb_tunnel = {
71 NULL, &ipip6_fb_tunnel_dev, {0, }, 0, 0, 0, 0, 0, 0, 0, {"sit0", }
72};
73
74static struct ip_tunnel *tunnels_r_l[HASH_SIZE];
75static struct ip_tunnel *tunnels_r[HASH_SIZE];
76static struct ip_tunnel *tunnels_l[HASH_SIZE];
77static struct ip_tunnel *tunnels_wc[1];
78static struct ip_tunnel **tunnels[4] = { tunnels_wc, tunnels_l, tunnels_r, tunnels_r_l };
79
80static rwlock_t ipip6_lock = RW_LOCK_UNLOCKED;
81
82static struct ip_tunnel * ipip6_tunnel_lookup(u32 remote, u32 local)
83{
84 unsigned h0 = HASH(remote);
85 unsigned h1 = HASH(local);
86 struct ip_tunnel *t;
87
88 for (t = tunnels_r_l[h0^h1]; t; t = t->next) {
89 if (local == t->parms.iph.saddr &&
90 remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP))
91 return t;
92 }
93 for (t = tunnels_r[h0]; t; t = t->next) {
94 if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP))
95 return t;
96 }
97 for (t = tunnels_l[h1]; t; t = t->next) {
98 if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP))
99 return t;
100 }
101 if ((t = tunnels_wc[0]) != NULL && (t->dev->flags&IFF_UP))
102 return t;
103 return NULL;
104}
105
106static struct ip_tunnel ** ipip6_bucket(struct ip_tunnel *t)
107{
108 u32 remote = t->parms.iph.daddr;
109 u32 local = t->parms.iph.saddr;
110 unsigned h = 0;
111 int prio = 0;
112
113 if (remote) {
114 prio |= 2;
115 h ^= HASH(remote);
116 }
117 if (local) {
118 prio |= 1;
119 h ^= HASH(local);
120 }
121 return &tunnels[prio][h];
122}
123
124static void ipip6_tunnel_unlink(struct ip_tunnel *t)
125{
126 struct ip_tunnel **tp;
127
128 for (tp = ipip6_bucket(t); *tp; tp = &(*tp)->next) {
129 if (t == *tp) {
130 write_lock_bh(&ipip6_lock);
131 *tp = t->next;
132 write_unlock_bh(&ipip6_lock);
133 break;
134 }
135 }
136}
137
138static void ipip6_tunnel_link(struct ip_tunnel *t)
139{
140 struct ip_tunnel **tp = ipip6_bucket(t);
141
142 write_lock_bh(&ipip6_lock);
143 t->next = *tp;
144 write_unlock_bh(&ipip6_lock);
145 *tp = t;
146}
147
148struct ip_tunnel * ipip6_tunnel_locate(struct ip_tunnel_parm *parms, int create)
149{
150 u32 remote = parms->iph.daddr;
151 u32 local = parms->iph.saddr;
152 struct ip_tunnel *t, **tp, *nt;
153 struct net_device *dev;
154 unsigned h = 0;
155 int prio = 0;
156
157 if (remote) {
158 prio |= 2;
159 h ^= HASH(remote);
160 }
161 if (local) {
162 prio |= 1;
163 h ^= HASH(local);
164 }
165 for (tp = &tunnels[prio][h]; (t = *tp) != NULL; tp = &t->next) {
166 if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr)
167 return t;
168 }
169 if (!create)
170 return NULL;
171
172 MOD_INC_USE_COUNT;
173 dev = kmalloc(sizeof(*dev) + sizeof(*t), GFP_KERNEL);
174 if (dev == NULL) {
175 MOD_DEC_USE_COUNT;
176 return NULL;
177 }
178 memset(dev, 0, sizeof(*dev) + sizeof(*t));
179 dev->priv = (void*)(dev+1);
180 nt = (struct ip_tunnel*)dev->priv;
181 nt->dev = dev;
182 dev->init = ipip6_tunnel_init;
183 dev->features |= NETIF_F_DYNALLOC;
184 memcpy(&nt->parms, parms, sizeof(*parms));
185 nt->parms.name[IFNAMSIZ-1] = '\0';
186 strcpy(dev->name, nt->parms.name);
187 if (dev->name[0] == 0) {
188 int i;
189 for (i=1; i<100; i++) {
190 sprintf(dev->name, "sit%d", i);
191 if (__dev_get_by_name(dev->name) == NULL)
192 break;
193 }
194 if (i==100)
195 goto failed;
196 memcpy(nt->parms.name, dev->name, IFNAMSIZ);
197 }
198 if (register_netdevice(dev) < 0)
199 goto failed;
200
201 dev_hold(dev);
202 ipip6_tunnel_link(nt);
203
204 return nt;
205
206failed:
207 kfree(dev);
208 MOD_DEC_USE_COUNT;
209 return NULL;
210}
211
212static void ipip6_tunnel_destructor(struct net_device *dev)
213{
214 if (dev != &ipip6_fb_tunnel_dev) {
215 MOD_DEC_USE_COUNT;
216 }
217}
218
219static void ipip6_tunnel_uninit(struct net_device *dev)
220{
221 if (dev == &ipip6_fb_tunnel_dev) {
222 write_lock_bh(&ipip6_lock);
223 tunnels_wc[0] = NULL;
224 write_unlock_bh(&ipip6_lock);
225 dev_put(dev);
226 } else {
227 ipip6_tunnel_unlink((struct ip_tunnel*)dev->priv);
228 dev_put(dev);
229 }
230}
231
232
233void ipip6_err(struct sk_buff *skb, u32 info)
234{
235#ifndef I_WISH_WORLD_WERE_PERFECT
236
237
238
239
240
241 struct iphdr *iph = (struct iphdr*)skb->data;
242 int type = skb->h.icmph->type;
243 int code = skb->h.icmph->code;
244 struct ip_tunnel *t;
245
246 switch (type) {
247 default:
248 case ICMP_PARAMETERPROB:
249 return;
250
251 case ICMP_DEST_UNREACH:
252 switch (code) {
253 case ICMP_SR_FAILED:
254 case ICMP_PORT_UNREACH:
255
256 return;
257 case ICMP_FRAG_NEEDED:
258
259 return;
260 default:
261
262
263
264
265 break;
266 }
267 break;
268 case ICMP_TIME_EXCEEDED:
269 if (code != ICMP_EXC_TTL)
270 return;
271 break;
272 }
273
274 read_lock(&ipip6_lock);
275 t = ipip6_tunnel_lookup(iph->daddr, iph->saddr);
276 if (t == NULL || t->parms.iph.daddr == 0)
277 goto out;
278 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
279 goto out;
280
281 if (jiffies - t->err_time < IPTUNNEL_ERR_TIMEO)
282 t->err_count++;
283 else
284 t->err_count = 1;
285 t->err_time = jiffies;
286out:
287 read_unlock(&ipip6_lock);
288 return;
289#else
290 struct iphdr *iph = (struct iphdr*)dp;
291 int hlen = iph->ihl<<2;
292 struct ipv6hdr *iph6;
293 int type = skb->h.icmph->type;
294 int code = skb->h.icmph->code;
295 int rel_type = 0;
296 int rel_code = 0;
297 int rel_info = 0;
298 struct sk_buff *skb2;
299 struct rt6_info *rt6i;
300
301 if (len < hlen + sizeof(struct ipv6hdr))
302 return;
303 iph6 = (struct ipv6hdr*)(dp + hlen);
304
305 switch (type) {
306 default:
307 return;
308 case ICMP_PARAMETERPROB:
309 if (skb->h.icmph->un.gateway < hlen)
310 return;
311
312
313
314
315 rel_type = ICMPV6_PARAMPROB;
316 rel_info = skb->h.icmph->un.gateway - hlen;
317 break;
318
319 case ICMP_DEST_UNREACH:
320 switch (code) {
321 case ICMP_SR_FAILED:
322 case ICMP_PORT_UNREACH:
323
324 return;
325 case ICMP_FRAG_NEEDED:
326
327 return;
328 default:
329
330
331
332
333 rel_type = ICMPV6_DEST_UNREACH;
334 rel_code = ICMPV6_ADDR_UNREACH;
335 break;
336 }
337 break;
338 case ICMP_TIME_EXCEEDED:
339 if (code != ICMP_EXC_TTL)
340 return;
341 rel_type = ICMPV6_TIME_EXCEED;
342 rel_code = ICMPV6_EXC_HOPLIMIT;
343 break;
344 }
345
346
347 skb2 = skb_clone(skb, GFP_ATOMIC);
348 if (skb2 == NULL)
349 return;
350 dst_release(skb2->dst);
351 skb2->dst = NULL;
352 skb_pull(skb2, skb->data - (u8*)iph6);
353 skb2->nh.raw = skb2->data;
354
355
356 rt6i = rt6_lookup(&iph6->saddr, NULL, NULL, 0);
357 if (rt6i && rt6i->rt6i_dev) {
358 skb2->dev = rt6i->rt6i_dev;
359
360 rt6i = rt6_lookup(&iph6->daddr, &iph6->saddr, NULL, 0);
361
362 if (rt6i && rt6i->rt6i_dev && rt6i->rt6i_dev->type == ARPHRD_SIT) {
363 struct ip_tunnel * t = (struct ip_tunnel*)rt6i->rt6i_dev->priv;
364 if (rel_type == ICMPV6_TIME_EXCEED && t->parms.iph.ttl) {
365 rel_type = ICMPV6_DEST_UNREACH;
366 rel_code = ICMPV6_ADDR_UNREACH;
367 }
368 icmpv6_send(skb2, rel_type, rel_code, rel_info, skb2->dev);
369 }
370 }
371 kfree_skb(skb2);
372 return;
373#endif
374}
375
376static inline void ipip6_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb)
377{
378 if (INET_ECN_is_ce(iph->tos) &&
379 INET_ECN_is_not_ce(ip6_get_dsfield(skb->nh.ipv6h)))
380 IP6_ECN_set_ce(skb->nh.ipv6h);
381}
382
383int ipip6_rcv(struct sk_buff *skb)
384{
385 struct iphdr *iph;
386 struct ip_tunnel *tunnel;
387
388 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
389 goto out;
390
391 iph = skb->nh.iph;
392
393 read_lock(&ipip6_lock);
394 if ((tunnel = ipip6_tunnel_lookup(iph->saddr, iph->daddr)) != NULL) {
395 skb->mac.raw = skb->nh.raw;
396 skb->nh.raw = skb->data;
397 memset(&(IPCB(skb)->opt), 0, sizeof(struct ip_options));
398 skb->protocol = htons(ETH_P_IPV6);
399 skb->pkt_type = PACKET_HOST;
400 tunnel->stat.rx_packets++;
401 tunnel->stat.rx_bytes += skb->len;
402 skb->dev = tunnel->dev;
403 dst_release(skb->dst);
404 skb->dst = NULL;
405 nf_reset(skb);
406 ipip6_ecn_decapsulate(iph, skb);
407 netif_rx(skb);
408 read_unlock(&ipip6_lock);
409 return 0;
410 }
411
412 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PROT_UNREACH, 0);
413 kfree_skb(skb);
414 read_unlock(&ipip6_lock);
415out:
416 return 0;
417}
418
419
420static inline int do_ip_send(struct sk_buff *skb)
421{
422 return ip_send(skb);
423}
424
425
426
427
428
429static inline u32 try_6to4(struct in6_addr *v6dst)
430{
431 u32 dst = 0;
432
433 if (v6dst->s6_addr16[0] == htons(0x2002)) {
434
435 memcpy(&dst, &v6dst->s6_addr16[1], 4);
436 }
437 return dst;
438}
439
440
441
442
443
444
445static int ipip6_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
446{
447 struct ip_tunnel *tunnel = (struct ip_tunnel*)dev->priv;
448 struct net_device_stats *stats = &tunnel->stat;
449 struct iphdr *tiph = &tunnel->parms.iph;
450 struct ipv6hdr *iph6 = skb->nh.ipv6h;
451 u8 tos = tunnel->parms.iph.tos;
452 struct rtable *rt;
453 struct net_device *tdev;
454 struct iphdr *iph;
455 int max_headroom;
456 u32 dst = tiph->daddr;
457 int mtu;
458 struct in6_addr *addr6;
459 int addr_type;
460
461 if (tunnel->recursion++) {
462 tunnel->stat.collisions++;
463 goto tx_error;
464 }
465
466 if (skb->protocol != htons(ETH_P_IPV6))
467 goto tx_error;
468
469 if (!dst)
470 dst = try_6to4(&iph6->daddr);
471
472 if (!dst) {
473 struct neighbour *neigh = NULL;
474
475 if (skb->dst)
476 neigh = skb->dst->neighbour;
477
478 if (neigh == NULL) {
479 if (net_ratelimit())
480 printk(KERN_DEBUG "sit: nexthop == NULL\n");
481 goto tx_error;
482 }
483
484 addr6 = (struct in6_addr*)&neigh->primary_key;
485 addr_type = ipv6_addr_type(addr6);
486
487 if (addr_type == IPV6_ADDR_ANY) {
488 addr6 = &skb->nh.ipv6h->daddr;
489 addr_type = ipv6_addr_type(addr6);
490 }
491
492 if ((addr_type & IPV6_ADDR_COMPATv4) == 0)
493 goto tx_error_icmp;
494
495 dst = addr6->s6_addr32[3];
496 }
497
498 if (ip_route_output(&rt, dst, tiph->saddr, RT_TOS(tos), tunnel->parms.link)) {
499 tunnel->stat.tx_carrier_errors++;
500 goto tx_error_icmp;
501 }
502 if (rt->rt_type != RTN_UNICAST) {
503 ip_rt_put(rt);
504 tunnel->stat.tx_carrier_errors++;
505 goto tx_error_icmp;
506 }
507 tdev = rt->u.dst.dev;
508
509 if (tdev == dev) {
510 ip_rt_put(rt);
511 tunnel->stat.collisions++;
512 goto tx_error;
513 }
514
515 if (tiph->frag_off)
516 mtu = rt->u.dst.pmtu - sizeof(struct iphdr);
517 else
518 mtu = skb->dst ? skb->dst->pmtu : dev->mtu;
519
520 if (mtu < 68) {
521 tunnel->stat.collisions++;
522 ip_rt_put(rt);
523 goto tx_error;
524 }
525 if (mtu < IPV6_MIN_MTU)
526 mtu = IPV6_MIN_MTU;
527 if (skb->dst && mtu < skb->dst->pmtu) {
528 struct rt6_info *rt6 = (struct rt6_info*)skb->dst;
529 if (mtu < rt6->u.dst.pmtu) {
530 if (tunnel->parms.iph.daddr || rt6->rt6i_dst.plen == 128) {
531 rt6->rt6i_flags |= RTF_MODIFIED;
532 rt6->u.dst.pmtu = mtu;
533 }
534 }
535 }
536 if (skb->len > mtu) {
537 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev);
538 ip_rt_put(rt);
539 goto tx_error;
540 }
541
542 if (tunnel->err_count > 0) {
543 if (jiffies - tunnel->err_time < IPTUNNEL_ERR_TIMEO) {
544 tunnel->err_count--;
545 dst_link_failure(skb);
546 } else
547 tunnel->err_count = 0;
548 }
549
550
551
552
553 max_headroom = (((tdev->hard_header_len+15)&~15)+sizeof(struct iphdr));
554
555 if (skb_headroom(skb) < max_headroom || skb_cloned(skb) || skb_shared(skb)) {
556 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
557 if (!new_skb) {
558 ip_rt_put(rt);
559 stats->tx_dropped++;
560 dev_kfree_skb(skb);
561 tunnel->recursion--;
562 return 0;
563 }
564 if (skb->sk)
565 skb_set_owner_w(new_skb, skb->sk);
566 dev_kfree_skb(skb);
567 skb = new_skb;
568 iph6 = skb->nh.ipv6h;
569 }
570
571 skb->h.raw = skb->nh.raw;
572 skb->nh.raw = skb_push(skb, sizeof(struct iphdr));
573 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
574 dst_release(skb->dst);
575 skb->dst = &rt->u.dst;
576
577
578
579
580
581 iph = skb->nh.iph;
582 iph->version = 4;
583 iph->ihl = sizeof(struct iphdr)>>2;
584 if (mtu > IPV6_MIN_MTU)
585 iph->frag_off = htons(IP_DF);
586 else
587 iph->frag_off = 0;
588
589 iph->protocol = IPPROTO_IPV6;
590 iph->tos = INET_ECN_encapsulate(tos, ip6_get_dsfield(iph6));
591 iph->daddr = rt->rt_dst;
592 iph->saddr = rt->rt_src;
593
594 if ((iph->ttl = tiph->ttl) == 0)
595 iph->ttl = iph6->hop_limit;
596
597 nf_reset(skb);
598
599 IPTUNNEL_XMIT();
600 tunnel->recursion--;
601 return 0;
602
603tx_error_icmp:
604 dst_link_failure(skb);
605tx_error:
606 stats->tx_errors++;
607 dev_kfree_skb(skb);
608 tunnel->recursion--;
609 return 0;
610}
611
612static int
613ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
614{
615 int err = 0;
616 struct ip_tunnel_parm p;
617 struct ip_tunnel *t;
618
619 MOD_INC_USE_COUNT;
620
621 switch (cmd) {
622 case SIOCGETTUNNEL:
623 t = NULL;
624 if (dev == &ipip6_fb_tunnel_dev) {
625 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
626 err = -EFAULT;
627 break;
628 }
629 t = ipip6_tunnel_locate(&p, 0);
630 }
631 if (t == NULL)
632 t = (struct ip_tunnel*)dev->priv;
633 memcpy(&p, &t->parms, sizeof(p));
634 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
635 err = -EFAULT;
636 break;
637
638 case SIOCADDTUNNEL:
639 case SIOCCHGTUNNEL:
640 err = -EPERM;
641 if (!capable(CAP_NET_ADMIN))
642 goto done;
643
644 err = -EFAULT;
645 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
646 goto done;
647
648 err = -EINVAL;
649 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 ||
650 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
651 goto done;
652 if (p.iph.ttl)
653 p.iph.frag_off |= htons(IP_DF);
654
655 t = ipip6_tunnel_locate(&p, cmd == SIOCADDTUNNEL);
656
657 if (dev != &ipip6_fb_tunnel_dev && cmd == SIOCCHGTUNNEL &&
658 t != &ipip6_fb_tunnel) {
659 if (t != NULL) {
660 if (t->dev != dev) {
661 err = -EEXIST;
662 break;
663 }
664 } else {
665 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
666 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
667 err = -EINVAL;
668 break;
669 }
670 t = (struct ip_tunnel*)dev->priv;
671 ipip6_tunnel_unlink(t);
672 t->parms.iph.saddr = p.iph.saddr;
673 t->parms.iph.daddr = p.iph.daddr;
674 memcpy(dev->dev_addr, &p.iph.saddr, 4);
675 memcpy(dev->broadcast, &p.iph.daddr, 4);
676 ipip6_tunnel_link(t);
677 netdev_state_change(dev);
678 }
679 }
680
681 if (t) {
682 err = 0;
683 if (cmd == SIOCCHGTUNNEL) {
684 t->parms.iph.ttl = p.iph.ttl;
685 t->parms.iph.tos = p.iph.tos;
686 }
687 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
688 err = -EFAULT;
689 } else
690 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
691 break;
692
693 case SIOCDELTUNNEL:
694 err = -EPERM;
695 if (!capable(CAP_NET_ADMIN))
696 goto done;
697
698 if (dev == &ipip6_fb_tunnel_dev) {
699 err = -EFAULT;
700 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
701 goto done;
702 err = -ENOENT;
703 if ((t = ipip6_tunnel_locate(&p, 0)) == NULL)
704 goto done;
705 err = -EPERM;
706 if (t == &ipip6_fb_tunnel)
707 goto done;
708 dev = t->dev;
709 }
710 err = unregister_netdevice(dev);
711 break;
712
713 default:
714 err = -EINVAL;
715 }
716
717done:
718 MOD_DEC_USE_COUNT;
719 return err;
720}
721
722static struct net_device_stats *ipip6_tunnel_get_stats(struct net_device *dev)
723{
724 return &(((struct ip_tunnel*)dev->priv)->stat);
725}
726
727static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu)
728{
729 if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr))
730 return -EINVAL;
731 dev->mtu = new_mtu;
732 return 0;
733}
734
735static void ipip6_tunnel_init_gen(struct net_device *dev)
736{
737 struct ip_tunnel *t = (struct ip_tunnel*)dev->priv;
738
739 dev->destructor = ipip6_tunnel_destructor;
740 dev->uninit = ipip6_tunnel_uninit;
741 dev->hard_start_xmit = ipip6_tunnel_xmit;
742 dev->get_stats = ipip6_tunnel_get_stats;
743 dev->do_ioctl = ipip6_tunnel_ioctl;
744 dev->change_mtu = ipip6_tunnel_change_mtu;
745
746 dev->type = ARPHRD_SIT;
747 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
748 dev->mtu = 1500 - sizeof(struct iphdr);
749 dev->flags = IFF_NOARP;
750 dev->iflink = 0;
751 dev->addr_len = 4;
752 memcpy(dev->dev_addr, &t->parms.iph.saddr, 4);
753 memcpy(dev->broadcast, &t->parms.iph.daddr, 4);
754}
755
756static int ipip6_tunnel_init(struct net_device *dev)
757{
758 struct net_device *tdev = NULL;
759 struct ip_tunnel *tunnel;
760 struct iphdr *iph;
761
762 tunnel = (struct ip_tunnel*)dev->priv;
763 iph = &tunnel->parms.iph;
764
765 ipip6_tunnel_init_gen(dev);
766
767 if (iph->daddr) {
768 struct rtable *rt;
769 if (!ip_route_output(&rt, iph->daddr, iph->saddr, RT_TOS(iph->tos), tunnel->parms.link)) {
770 tdev = rt->u.dst.dev;
771 ip_rt_put(rt);
772 }
773 dev->flags |= IFF_POINTOPOINT;
774 }
775
776 if (!tdev && tunnel->parms.link)
777 tdev = __dev_get_by_index(tunnel->parms.link);
778
779 if (tdev) {
780 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
781 dev->mtu = tdev->mtu - sizeof(struct iphdr);
782 if (dev->mtu < IPV6_MIN_MTU)
783 dev->mtu = IPV6_MIN_MTU;
784 }
785 dev->iflink = tunnel->parms.link;
786
787 return 0;
788}
789
790#ifdef MODULE
791static int ipip6_fb_tunnel_open(struct net_device *dev)
792{
793 MOD_INC_USE_COUNT;
794 return 0;
795}
796
797static int ipip6_fb_tunnel_close(struct net_device *dev)
798{
799 MOD_DEC_USE_COUNT;
800 return 0;
801}
802#endif
803
804int __init ipip6_fb_tunnel_init(struct net_device *dev)
805{
806 struct iphdr *iph;
807
808 ipip6_tunnel_init_gen(dev);
809#ifdef MODULE
810 dev->open = ipip6_fb_tunnel_open;
811 dev->stop = ipip6_fb_tunnel_close;
812#endif
813
814 iph = &ipip6_fb_tunnel.parms.iph;
815 iph->version = 4;
816 iph->protocol = IPPROTO_IPV6;
817 iph->ihl = 5;
818 iph->ttl = 64;
819
820 dev_hold(dev);
821 tunnels_wc[0] = &ipip6_fb_tunnel;
822 return 0;
823}
824
825static struct inet_protocol sit_protocol = {
826 ipip6_rcv,
827 ipip6_err,
828 0,
829 IPPROTO_IPV6,
830 0,
831 NULL,
832 "IPv6"
833};
834
835#ifdef MODULE
836void sit_cleanup(void)
837{
838 inet_del_protocol(&sit_protocol);
839 unregister_netdev(&ipip6_fb_tunnel_dev);
840}
841#endif
842
843int __init sit_init(void)
844{
845 printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n");
846
847 ipip6_fb_tunnel_dev.priv = (void*)&ipip6_fb_tunnel;
848 strcpy(ipip6_fb_tunnel_dev.name, ipip6_fb_tunnel.parms.name);
849 register_netdev(&ipip6_fb_tunnel_dev);
850 inet_add_protocol(&sit_protocol);
851 return 0;
852}
853
