2 * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT)
3 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
9 * $Id: sit.c,v 1.53 2001/09/25 05:09:53 davem Exp $
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
17 * Roger Venning <r.venning@telstra.com>: 6to4 support
18 * Nate Thompson <nate@thebog.net>: 6to4 support
19 * Fred Templin <fred.l.templin@boeing.com>: isatap support
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 <asm/uaccess.h>
34 #include <linux/init.h>
35 #include <linux/netfilter_ipv4.h>
36 #include <linux/if_ether.h>
42 #include <net/protocol.h>
43 #include <net/transp_v6.h>
44 #include <net/ip6_fib.h>
45 #include <net/ip6_route.h>
46 #include <net/ndisc.h>
47 #include <net/addrconf.h>
52 #include <net/inet_ecn.h>
54 #include <net/dsfield.h>
57 This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c
59 For comments look at net/ipv4/ip_gre.c --ANK
63 #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)
65 static int ipip6_fb_tunnel_init(struct net_device *dev);
66 static int ipip6_tunnel_init(struct net_device *dev);
67 static void ipip6_tunnel_setup(struct net_device *dev);
69 static struct net_device *ipip6_fb_tunnel_dev;
71 static struct ip_tunnel *tunnels_r_l[HASH_SIZE];
72 static struct ip_tunnel *tunnels_r[HASH_SIZE];
73 static struct ip_tunnel *tunnels_l[HASH_SIZE];
74 static struct ip_tunnel *tunnels_wc[1];
75 static struct ip_tunnel **tunnels[4] = { tunnels_wc, tunnels_l, tunnels_r, tunnels_r_l };
77 static DEFINE_RWLOCK(ipip6_lock);
79 static struct ip_tunnel * ipip6_tunnel_lookup(__be32 remote, __be32 local)
81 unsigned h0 = HASH(remote);
82 unsigned h1 = HASH(local);
85 for (t = tunnels_r_l[h0^h1]; t; t = t->next) {
86 if (local == t->parms.iph.saddr &&
87 remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP))
90 for (t = tunnels_r[h0]; t; t = t->next) {
91 if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP))
94 for (t = tunnels_l[h1]; t; t = t->next) {
95 if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP))
98 if ((t = tunnels_wc[0]) != NULL && (t->dev->flags&IFF_UP))
103 static struct ip_tunnel **__ipip6_bucket(struct ip_tunnel_parm *parms)
105 __be32 remote = parms->iph.daddr;
106 __be32 local = parms->iph.saddr;
118 return &tunnels[prio][h];
121 static inline struct ip_tunnel **ipip6_bucket(struct ip_tunnel *t)
123 return __ipip6_bucket(&t->parms);
126 static void ipip6_tunnel_unlink(struct ip_tunnel *t)
128 struct ip_tunnel **tp;
130 for (tp = ipip6_bucket(t); *tp; tp = &(*tp)->next) {
132 write_lock_bh(&ipip6_lock);
134 write_unlock_bh(&ipip6_lock);
140 static void ipip6_tunnel_link(struct ip_tunnel *t)
142 struct ip_tunnel **tp = ipip6_bucket(t);
145 write_lock_bh(&ipip6_lock);
147 write_unlock_bh(&ipip6_lock);
150 static struct ip_tunnel * ipip6_tunnel_locate(struct ip_tunnel_parm *parms, int create)
152 __be32 remote = parms->iph.daddr;
153 __be32 local = parms->iph.saddr;
154 struct ip_tunnel *t, **tp, *nt;
155 struct net_device *dev;
158 for (tp = __ipip6_bucket(parms); (t = *tp) != NULL; tp = &t->next) {
159 if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr)
166 strlcpy(name, parms->name, IFNAMSIZ);
168 sprintf(name, "sit%%d");
170 dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup);
174 if (strchr(name, '%')) {
175 if (dev_alloc_name(dev, name) < 0)
179 nt = netdev_priv(dev);
180 dev->init = ipip6_tunnel_init;
183 if (parms->i_flags & SIT_ISATAP)
184 dev->priv_flags |= IFF_ISATAP;
186 if (register_netdevice(dev) < 0)
191 ipip6_tunnel_link(nt);
200 static struct ip_tunnel_prl_entry *
201 __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr)
203 struct ip_tunnel_prl_entry *p = (struct ip_tunnel_prl_entry *)NULL;
205 for (p = t->prl; p; p = p->next)
206 if (p->entry.addr == addr)
213 ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg)
215 struct ip_tunnel_prl_entry *p;
218 if (a->addr == htonl(INADDR_ANY))
221 write_lock(&ipip6_lock);
223 for (p = t->prl; p; p = p->next) {
224 if (p->entry.addr == a->addr) {
237 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL);
248 write_unlock(&ipip6_lock);
253 ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
255 struct ip_tunnel_prl_entry *x, **p;
258 write_lock(&ipip6_lock);
260 if (a && a->addr != htonl(INADDR_ANY)) {
261 for (p = &t->prl; *p; p = &(*p)->next) {
262 if ((*p)->entry.addr == a->addr) {
273 t->prl = t->prl->next;
278 write_unlock(&ipip6_lock);
282 /* copied directly from anycast.c */
284 ipip6_onlink(struct in6_addr *addr, struct net_device *dev)
286 struct inet6_dev *idev;
287 struct inet6_ifaddr *ifa;
292 idev = __in6_dev_get(dev);
294 read_lock_bh(&idev->lock);
295 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
296 onlink = ipv6_prefix_equal(addr, &ifa->addr,
301 read_unlock_bh(&idev->lock);
308 isatap_chksrc(struct sk_buff *skb, struct iphdr *iph, struct ip_tunnel *t)
310 struct ip_tunnel_prl_entry *p;
313 read_lock(&ipip6_lock);
314 p = __ipip6_tunnel_locate_prl(t, iph->saddr);
316 if (p->entry.flags & PRL_DEFAULT)
317 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT;
319 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT;
321 struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr;
322 if (ipv6_addr_is_isatap(addr6) &&
323 (addr6->s6_addr32[3] == iph->saddr) &&
324 ipip6_onlink(addr6, t->dev))
325 skb->ndisc_nodetype = NDISC_NODETYPE_HOST;
329 read_unlock(&ipip6_lock);
333 static void ipip6_tunnel_uninit(struct net_device *dev)
335 if (dev == ipip6_fb_tunnel_dev) {
336 write_lock_bh(&ipip6_lock);
337 tunnels_wc[0] = NULL;
338 write_unlock_bh(&ipip6_lock);
341 ipip6_tunnel_unlink(netdev_priv(dev));
342 ipip6_tunnel_del_prl(netdev_priv(dev), 0);
348 static int ipip6_err(struct sk_buff *skb, u32 info)
350 #ifndef I_WISH_WORLD_WERE_PERFECT
352 /* It is not :-( All the routers (except for Linux) return only
353 8 bytes of packet payload. It means, that precise relaying of
354 ICMP in the real Internet is absolutely infeasible.
356 struct iphdr *iph = (struct iphdr*)skb->data;
357 const int type = icmp_hdr(skb)->type;
358 const int code = icmp_hdr(skb)->code;
364 case ICMP_PARAMETERPROB:
367 case ICMP_DEST_UNREACH:
370 case ICMP_PORT_UNREACH:
371 /* Impossible event. */
373 case ICMP_FRAG_NEEDED:
374 /* Soft state for pmtu is maintained by IP core. */
377 /* All others are translated to HOST_UNREACH.
378 rfc2003 contains "deep thoughts" about NET_UNREACH,
379 I believe they are just ether pollution. --ANK
384 case ICMP_TIME_EXCEEDED:
385 if (code != ICMP_EXC_TTL)
392 read_lock(&ipip6_lock);
393 t = ipip6_tunnel_lookup(iph->daddr, iph->saddr);
394 if (t == NULL || t->parms.iph.daddr == 0)
398 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
401 if (jiffies - t->err_time < IPTUNNEL_ERR_TIMEO)
405 t->err_time = jiffies;
407 read_unlock(&ipip6_lock);
410 struct iphdr *iph = (struct iphdr*)dp;
411 int hlen = iph->ihl<<2;
412 struct ipv6hdr *iph6;
413 const int type = icmp_hdr(skb)->type;
414 const int code = icmp_hdr(skb)->code;
418 struct sk_buff *skb2;
419 struct rt6_info *rt6i;
421 if (len < hlen + sizeof(struct ipv6hdr))
423 iph6 = (struct ipv6hdr*)(dp + hlen);
428 case ICMP_PARAMETERPROB:
429 if (icmp_hdr(skb)->un.gateway < hlen)
432 /* So... This guy found something strange INSIDE encapsulated
433 packet. Well, he is fool, but what can we do ?
435 rel_type = ICMPV6_PARAMPROB;
436 rel_info = icmp_hdr(skb)->un.gateway - hlen;
439 case ICMP_DEST_UNREACH:
442 case ICMP_PORT_UNREACH:
443 /* Impossible event. */
445 case ICMP_FRAG_NEEDED:
446 /* Too complicated case ... */
449 /* All others are translated to HOST_UNREACH.
450 rfc2003 contains "deep thoughts" about NET_UNREACH,
451 I believe, it is just ether pollution. --ANK
453 rel_type = ICMPV6_DEST_UNREACH;
454 rel_code = ICMPV6_ADDR_UNREACH;
458 case ICMP_TIME_EXCEEDED:
459 if (code != ICMP_EXC_TTL)
461 rel_type = ICMPV6_TIME_EXCEED;
462 rel_code = ICMPV6_EXC_HOPLIMIT;
466 /* Prepare fake skb to feed it to icmpv6_send */
467 skb2 = skb_clone(skb, GFP_ATOMIC);
470 dst_release(skb2->dst);
472 skb_pull(skb2, skb->data - (u8*)iph6);
473 skb_reset_network_header(skb2);
475 /* Try to guess incoming interface */
476 rt6i = rt6_lookup(&init_net, &iph6->saddr, NULL, NULL, 0);
477 if (rt6i && rt6i->rt6i_dev) {
478 skb2->dev = rt6i->rt6i_dev;
480 rt6i = rt6_lookup(&init_net, &iph6->daddr, &iph6->saddr, NULL, 0);
482 if (rt6i && rt6i->rt6i_dev && rt6i->rt6i_dev->type == ARPHRD_SIT) {
483 struct ip_tunnel *t = netdev_priv(rt6i->rt6i_dev);
484 if (rel_type == ICMPV6_TIME_EXCEED && t->parms.iph.ttl) {
485 rel_type = ICMPV6_DEST_UNREACH;
486 rel_code = ICMPV6_ADDR_UNREACH;
488 icmpv6_send(skb2, rel_type, rel_code, rel_info, skb2->dev);
496 static inline void ipip6_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb)
498 if (INET_ECN_is_ce(iph->tos))
499 IP6_ECN_set_ce(ipv6_hdr(skb));
502 static int ipip6_rcv(struct sk_buff *skb)
505 struct ip_tunnel *tunnel;
507 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
512 read_lock(&ipip6_lock);
513 if ((tunnel = ipip6_tunnel_lookup(iph->saddr, iph->daddr)) != NULL) {
515 skb->mac_header = skb->network_header;
516 skb_reset_network_header(skb);
517 IPCB(skb)->flags = 0;
518 skb->protocol = htons(ETH_P_IPV6);
519 skb->pkt_type = PACKET_HOST;
521 if ((tunnel->dev->priv_flags & IFF_ISATAP) &&
522 !isatap_chksrc(skb, iph, tunnel)) {
523 tunnel->stat.rx_errors++;
524 read_unlock(&ipip6_lock);
528 tunnel->stat.rx_packets++;
529 tunnel->stat.rx_bytes += skb->len;
530 skb->dev = tunnel->dev;
531 dst_release(skb->dst);
534 ipip6_ecn_decapsulate(iph, skb);
536 read_unlock(&ipip6_lock);
540 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
542 read_unlock(&ipip6_lock);
547 /* Returns the embedded IPv4 address if the IPv6 address
548 comes from 6to4 (RFC 3056) addr space */
550 static inline __be32 try_6to4(struct in6_addr *v6dst)
554 if (v6dst->s6_addr16[0] == htons(0x2002)) {
555 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
556 memcpy(&dst, &v6dst->s6_addr16[1], 4);
562 * This function assumes it is being called from dev_queue_xmit()
563 * and that skb is filled properly by that function.
566 static int ipip6_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
568 struct ip_tunnel *tunnel = netdev_priv(dev);
569 struct net_device_stats *stats = &tunnel->stat;
570 struct iphdr *tiph = &tunnel->parms.iph;
571 struct ipv6hdr *iph6 = ipv6_hdr(skb);
572 u8 tos = tunnel->parms.iph.tos;
573 struct rtable *rt; /* Route to the other host */
574 struct net_device *tdev; /* Device to other host */
575 struct iphdr *iph; /* Our new IP header */
576 unsigned int max_headroom; /* The extra header space needed */
577 __be32 dst = tiph->daddr;
579 struct in6_addr *addr6;
582 if (tunnel->recursion++) {
583 tunnel->stat.collisions++;
587 if (skb->protocol != htons(ETH_P_IPV6))
590 /* ISATAP (RFC4214) - must come before 6to4 */
591 if (dev->priv_flags & IFF_ISATAP) {
592 struct neighbour *neigh = NULL;
595 neigh = skb->dst->neighbour;
599 printk(KERN_DEBUG "sit: nexthop == NULL\n");
603 addr6 = (struct in6_addr*)&neigh->primary_key;
604 addr_type = ipv6_addr_type(addr6);
606 if ((addr_type & IPV6_ADDR_UNICAST) &&
607 ipv6_addr_is_isatap(addr6))
608 dst = addr6->s6_addr32[3];
614 dst = try_6to4(&iph6->daddr);
617 struct neighbour *neigh = NULL;
620 neigh = skb->dst->neighbour;
624 printk(KERN_DEBUG "sit: nexthop == NULL\n");
628 addr6 = (struct in6_addr*)&neigh->primary_key;
629 addr_type = ipv6_addr_type(addr6);
631 if (addr_type == IPV6_ADDR_ANY) {
632 addr6 = &ipv6_hdr(skb)->daddr;
633 addr_type = ipv6_addr_type(addr6);
636 if ((addr_type & IPV6_ADDR_COMPATv4) == 0)
639 dst = addr6->s6_addr32[3];
643 struct flowi fl = { .nl_u = { .ip4_u =
645 .saddr = tiph->saddr,
646 .tos = RT_TOS(tos) } },
647 .oif = tunnel->parms.link,
648 .proto = IPPROTO_IPV6 };
649 if (ip_route_output_key(&init_net, &rt, &fl)) {
650 tunnel->stat.tx_carrier_errors++;
654 if (rt->rt_type != RTN_UNICAST) {
656 tunnel->stat.tx_carrier_errors++;
659 tdev = rt->u.dst.dev;
663 tunnel->stat.collisions++;
668 mtu = dst_mtu(&rt->u.dst) - sizeof(struct iphdr);
670 mtu = skb->dst ? dst_mtu(skb->dst) : dev->mtu;
673 tunnel->stat.collisions++;
677 if (mtu < IPV6_MIN_MTU)
679 if (tunnel->parms.iph.daddr && skb->dst)
680 skb->dst->ops->update_pmtu(skb->dst, mtu);
682 if (skb->len > mtu) {
683 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev);
688 if (tunnel->err_count > 0) {
689 if (jiffies - tunnel->err_time < IPTUNNEL_ERR_TIMEO) {
691 dst_link_failure(skb);
693 tunnel->err_count = 0;
697 * Okay, now see if we can stuff it in the buffer as-is.
699 max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr);
701 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
702 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
703 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
712 skb_set_owner_w(new_skb, skb->sk);
715 iph6 = ipv6_hdr(skb);
718 skb->transport_header = skb->network_header;
719 skb_push(skb, sizeof(struct iphdr));
720 skb_reset_network_header(skb);
721 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
722 IPCB(skb)->flags = 0;
723 dst_release(skb->dst);
724 skb->dst = &rt->u.dst;
727 * Push down and install the IPIP header.
732 iph->ihl = sizeof(struct iphdr)>>2;
733 if (mtu > IPV6_MIN_MTU)
734 iph->frag_off = htons(IP_DF);
738 iph->protocol = IPPROTO_IPV6;
739 iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
740 iph->daddr = rt->rt_dst;
741 iph->saddr = rt->rt_src;
743 if ((iph->ttl = tiph->ttl) == 0)
744 iph->ttl = iph6->hop_limit;
753 dst_link_failure(skb);
761 static void ipip6_tunnel_bind_dev(struct net_device *dev)
763 struct net_device *tdev = NULL;
764 struct ip_tunnel *tunnel;
767 tunnel = netdev_priv(dev);
768 iph = &tunnel->parms.iph;
771 struct flowi fl = { .nl_u = { .ip4_u =
772 { .daddr = iph->daddr,
774 .tos = RT_TOS(iph->tos) } },
775 .oif = tunnel->parms.link,
776 .proto = IPPROTO_IPV6 };
778 if (!ip_route_output_key(&init_net, &rt, &fl)) {
779 tdev = rt->u.dst.dev;
782 dev->flags |= IFF_POINTOPOINT;
785 if (!tdev && tunnel->parms.link)
786 tdev = __dev_get_by_index(&init_net, tunnel->parms.link);
789 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
790 dev->mtu = tdev->mtu - sizeof(struct iphdr);
791 if (dev->mtu < IPV6_MIN_MTU)
792 dev->mtu = IPV6_MIN_MTU;
794 dev->iflink = tunnel->parms.link;
798 ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
801 struct ip_tunnel_parm p;
802 struct ip_tunnel_prl prl;
808 if (dev == ipip6_fb_tunnel_dev) {
809 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
813 t = ipip6_tunnel_locate(&p, 0);
816 t = netdev_priv(dev);
817 memcpy(&p, &t->parms, sizeof(p));
818 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
825 if (!capable(CAP_NET_ADMIN))
829 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
833 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 ||
834 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
837 p.iph.frag_off |= htons(IP_DF);
839 t = ipip6_tunnel_locate(&p, cmd == SIOCADDTUNNEL);
841 if (dev != ipip6_fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
848 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
849 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
853 t = netdev_priv(dev);
854 ipip6_tunnel_unlink(t);
855 t->parms.iph.saddr = p.iph.saddr;
856 t->parms.iph.daddr = p.iph.daddr;
857 memcpy(dev->dev_addr, &p.iph.saddr, 4);
858 memcpy(dev->broadcast, &p.iph.daddr, 4);
859 ipip6_tunnel_link(t);
860 netdev_state_change(dev);
866 if (cmd == SIOCCHGTUNNEL) {
867 t->parms.iph.ttl = p.iph.ttl;
868 t->parms.iph.tos = p.iph.tos;
869 if (t->parms.link != p.link) {
870 t->parms.link = p.link;
871 ipip6_tunnel_bind_dev(dev);
872 netdev_state_change(dev);
875 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
878 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
883 if (!capable(CAP_NET_ADMIN))
886 if (dev == ipip6_fb_tunnel_dev) {
888 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
891 if ((t = ipip6_tunnel_locate(&p, 0)) == NULL)
894 if (t == netdev_priv(ipip6_fb_tunnel_dev))
898 unregister_netdevice(dev);
906 if (!capable(CAP_NET_ADMIN))
909 if (dev == ipip6_fb_tunnel_dev)
912 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))
915 if (!(t = netdev_priv(dev)))
918 if (cmd == SIOCDELPRL)
919 err = ipip6_tunnel_del_prl(t, &prl);
921 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
922 netdev_state_change(dev);
933 static struct net_device_stats *ipip6_tunnel_get_stats(struct net_device *dev)
935 return &(((struct ip_tunnel*)netdev_priv(dev))->stat);
938 static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu)
940 if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr))
946 static void ipip6_tunnel_setup(struct net_device *dev)
948 dev->uninit = ipip6_tunnel_uninit;
949 dev->destructor = free_netdev;
950 dev->hard_start_xmit = ipip6_tunnel_xmit;
951 dev->get_stats = ipip6_tunnel_get_stats;
952 dev->do_ioctl = ipip6_tunnel_ioctl;
953 dev->change_mtu = ipip6_tunnel_change_mtu;
955 dev->type = ARPHRD_SIT;
956 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
957 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr);
958 dev->flags = IFF_NOARP;
963 static int ipip6_tunnel_init(struct net_device *dev)
965 struct ip_tunnel *tunnel;
967 tunnel = netdev_priv(dev);
970 strcpy(tunnel->parms.name, dev->name);
972 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
973 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
975 ipip6_tunnel_bind_dev(dev);
980 static int __init ipip6_fb_tunnel_init(struct net_device *dev)
982 struct ip_tunnel *tunnel = netdev_priv(dev);
983 struct iphdr *iph = &tunnel->parms.iph;
986 strcpy(tunnel->parms.name, dev->name);
989 iph->protocol = IPPROTO_IPV6;
994 tunnels_wc[0] = tunnel;
998 static struct xfrm_tunnel sit_handler = {
999 .handler = ipip6_rcv,
1000 .err_handler = ipip6_err,
1004 static void __exit sit_destroy_tunnels(void)
1008 for (prio = 1; prio < 4; prio++) {
1010 for (h = 0; h < HASH_SIZE; h++) {
1011 struct ip_tunnel *t;
1012 while ((t = tunnels[prio][h]) != NULL)
1013 unregister_netdevice(t->dev);
1018 static void __exit sit_cleanup(void)
1020 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1023 sit_destroy_tunnels();
1024 unregister_netdevice(ipip6_fb_tunnel_dev);
1028 static int __init sit_init(void)
1032 printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n");
1034 if (xfrm4_tunnel_register(&sit_handler, AF_INET6) < 0) {
1035 printk(KERN_INFO "sit init: Can't add protocol\n");
1039 ipip6_fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
1040 ipip6_tunnel_setup);
1041 if (!ipip6_fb_tunnel_dev) {
1046 ipip6_fb_tunnel_dev->init = ipip6_fb_tunnel_init;
1048 if ((err = register_netdev(ipip6_fb_tunnel_dev)))
1054 free_netdev(ipip6_fb_tunnel_dev);
1056 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1060 module_init(sit_init);
1061 module_exit(sit_cleanup);
1062 MODULE_LICENSE("GPL");
1063 MODULE_ALIAS("sit0");