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 write_lock(&ipip6_lock);
220 for (p = t->prl; p; p = p->next) {
221 if (p->entry.addr == a->addr) {
234 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL);
245 write_unlock(&ipip6_lock);
250 ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
252 struct ip_tunnel_prl_entry *x, **p;
255 write_lock(&ipip6_lock);
258 for (p = &t->prl; *p; p = &(*p)->next) {
259 if ((*p)->entry.addr == a->addr) {
270 t->prl = t->prl->next;
275 write_unlock(&ipip6_lock);
279 /* copied directly from anycast.c */
281 ipip6_onlink(struct in6_addr *addr, struct net_device *dev)
283 struct inet6_dev *idev;
284 struct inet6_ifaddr *ifa;
289 idev = __in6_dev_get(dev);
291 read_lock_bh(&idev->lock);
292 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
293 onlink = ipv6_prefix_equal(addr, &ifa->addr,
298 read_unlock_bh(&idev->lock);
305 isatap_chksrc(struct sk_buff *skb, struct iphdr *iph, struct ip_tunnel *t)
307 struct ip_tunnel_prl_entry *p;
310 read_lock(&ipip6_lock);
311 p = __ipip6_tunnel_locate_prl(t, iph->saddr);
313 if (p->entry.flags & PRL_DEFAULT)
314 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT;
316 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT;
318 struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr;
319 if (ipv6_addr_is_isatap(addr6) &&
320 (addr6->s6_addr32[3] == iph->saddr) &&
321 ipip6_onlink(addr6, t->dev))
322 skb->ndisc_nodetype = NDISC_NODETYPE_HOST;
326 read_unlock(&ipip6_lock);
330 static void ipip6_tunnel_uninit(struct net_device *dev)
332 if (dev == ipip6_fb_tunnel_dev) {
333 write_lock_bh(&ipip6_lock);
334 tunnels_wc[0] = NULL;
335 write_unlock_bh(&ipip6_lock);
338 ipip6_tunnel_unlink(netdev_priv(dev));
339 ipip6_tunnel_del_prl(netdev_priv(dev), 0);
345 static int ipip6_err(struct sk_buff *skb, u32 info)
347 #ifndef I_WISH_WORLD_WERE_PERFECT
349 /* It is not :-( All the routers (except for Linux) return only
350 8 bytes of packet payload. It means, that precise relaying of
351 ICMP in the real Internet is absolutely infeasible.
353 struct iphdr *iph = (struct iphdr*)skb->data;
354 const int type = icmp_hdr(skb)->type;
355 const int code = icmp_hdr(skb)->code;
361 case ICMP_PARAMETERPROB:
364 case ICMP_DEST_UNREACH:
367 case ICMP_PORT_UNREACH:
368 /* Impossible event. */
370 case ICMP_FRAG_NEEDED:
371 /* Soft state for pmtu is maintained by IP core. */
374 /* All others are translated to HOST_UNREACH.
375 rfc2003 contains "deep thoughts" about NET_UNREACH,
376 I believe they are just ether pollution. --ANK
381 case ICMP_TIME_EXCEEDED:
382 if (code != ICMP_EXC_TTL)
389 read_lock(&ipip6_lock);
390 t = ipip6_tunnel_lookup(iph->daddr, iph->saddr);
391 if (t == NULL || t->parms.iph.daddr == 0)
395 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
398 if (jiffies - t->err_time < IPTUNNEL_ERR_TIMEO)
402 t->err_time = jiffies;
404 read_unlock(&ipip6_lock);
407 struct iphdr *iph = (struct iphdr*)dp;
408 int hlen = iph->ihl<<2;
409 struct ipv6hdr *iph6;
410 const int type = icmp_hdr(skb)->type;
411 const int code = icmp_hdr(skb)->code;
415 struct sk_buff *skb2;
416 struct rt6_info *rt6i;
418 if (len < hlen + sizeof(struct ipv6hdr))
420 iph6 = (struct ipv6hdr*)(dp + hlen);
425 case ICMP_PARAMETERPROB:
426 if (icmp_hdr(skb)->un.gateway < hlen)
429 /* So... This guy found something strange INSIDE encapsulated
430 packet. Well, he is fool, but what can we do ?
432 rel_type = ICMPV6_PARAMPROB;
433 rel_info = icmp_hdr(skb)->un.gateway - hlen;
436 case ICMP_DEST_UNREACH:
439 case ICMP_PORT_UNREACH:
440 /* Impossible event. */
442 case ICMP_FRAG_NEEDED:
443 /* Too complicated case ... */
446 /* All others are translated to HOST_UNREACH.
447 rfc2003 contains "deep thoughts" about NET_UNREACH,
448 I believe, it is just ether pollution. --ANK
450 rel_type = ICMPV6_DEST_UNREACH;
451 rel_code = ICMPV6_ADDR_UNREACH;
455 case ICMP_TIME_EXCEEDED:
456 if (code != ICMP_EXC_TTL)
458 rel_type = ICMPV6_TIME_EXCEED;
459 rel_code = ICMPV6_EXC_HOPLIMIT;
463 /* Prepare fake skb to feed it to icmpv6_send */
464 skb2 = skb_clone(skb, GFP_ATOMIC);
467 dst_release(skb2->dst);
469 skb_pull(skb2, skb->data - (u8*)iph6);
470 skb_reset_network_header(skb2);
472 /* Try to guess incoming interface */
473 rt6i = rt6_lookup(&init_net, &iph6->saddr, NULL, NULL, 0);
474 if (rt6i && rt6i->rt6i_dev) {
475 skb2->dev = rt6i->rt6i_dev;
477 rt6i = rt6_lookup(&init_net, &iph6->daddr, &iph6->saddr, NULL, 0);
479 if (rt6i && rt6i->rt6i_dev && rt6i->rt6i_dev->type == ARPHRD_SIT) {
480 struct ip_tunnel *t = netdev_priv(rt6i->rt6i_dev);
481 if (rel_type == ICMPV6_TIME_EXCEED && t->parms.iph.ttl) {
482 rel_type = ICMPV6_DEST_UNREACH;
483 rel_code = ICMPV6_ADDR_UNREACH;
485 icmpv6_send(skb2, rel_type, rel_code, rel_info, skb2->dev);
493 static inline void ipip6_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb)
495 if (INET_ECN_is_ce(iph->tos))
496 IP6_ECN_set_ce(ipv6_hdr(skb));
499 static int ipip6_rcv(struct sk_buff *skb)
502 struct ip_tunnel *tunnel;
504 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
509 read_lock(&ipip6_lock);
510 if ((tunnel = ipip6_tunnel_lookup(iph->saddr, iph->daddr)) != NULL) {
512 skb->mac_header = skb->network_header;
513 skb_reset_network_header(skb);
514 IPCB(skb)->flags = 0;
515 skb->protocol = htons(ETH_P_IPV6);
516 skb->pkt_type = PACKET_HOST;
518 if ((tunnel->dev->priv_flags & IFF_ISATAP) &&
519 !isatap_chksrc(skb, iph, tunnel)) {
520 tunnel->stat.rx_errors++;
521 read_unlock(&ipip6_lock);
525 tunnel->stat.rx_packets++;
526 tunnel->stat.rx_bytes += skb->len;
527 skb->dev = tunnel->dev;
528 dst_release(skb->dst);
531 ipip6_ecn_decapsulate(iph, skb);
533 read_unlock(&ipip6_lock);
537 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
539 read_unlock(&ipip6_lock);
544 /* Returns the embedded IPv4 address if the IPv6 address
545 comes from 6to4 (RFC 3056) addr space */
547 static inline __be32 try_6to4(struct in6_addr *v6dst)
551 if (v6dst->s6_addr16[0] == htons(0x2002)) {
552 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
553 memcpy(&dst, &v6dst->s6_addr16[1], 4);
559 * This function assumes it is being called from dev_queue_xmit()
560 * and that skb is filled properly by that function.
563 static int ipip6_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
565 struct ip_tunnel *tunnel = netdev_priv(dev);
566 struct net_device_stats *stats = &tunnel->stat;
567 struct iphdr *tiph = &tunnel->parms.iph;
568 struct ipv6hdr *iph6 = ipv6_hdr(skb);
569 u8 tos = tunnel->parms.iph.tos;
570 struct rtable *rt; /* Route to the other host */
571 struct net_device *tdev; /* Device to other host */
572 struct iphdr *iph; /* Our new IP header */
573 unsigned int max_headroom; /* The extra header space needed */
574 __be32 dst = tiph->daddr;
576 struct in6_addr *addr6;
579 if (tunnel->recursion++) {
580 tunnel->stat.collisions++;
584 if (skb->protocol != htons(ETH_P_IPV6))
587 /* ISATAP (RFC4214) - must come before 6to4 */
588 if (dev->priv_flags & IFF_ISATAP) {
589 struct neighbour *neigh = NULL;
592 neigh = skb->dst->neighbour;
596 printk(KERN_DEBUG "sit: nexthop == NULL\n");
600 addr6 = (struct in6_addr*)&neigh->primary_key;
601 addr_type = ipv6_addr_type(addr6);
603 if ((addr_type & IPV6_ADDR_UNICAST) &&
604 ipv6_addr_is_isatap(addr6))
605 dst = addr6->s6_addr32[3];
611 dst = try_6to4(&iph6->daddr);
614 struct neighbour *neigh = NULL;
617 neigh = skb->dst->neighbour;
621 printk(KERN_DEBUG "sit: nexthop == NULL\n");
625 addr6 = (struct in6_addr*)&neigh->primary_key;
626 addr_type = ipv6_addr_type(addr6);
628 if (addr_type == IPV6_ADDR_ANY) {
629 addr6 = &ipv6_hdr(skb)->daddr;
630 addr_type = ipv6_addr_type(addr6);
633 if ((addr_type & IPV6_ADDR_COMPATv4) == 0)
636 dst = addr6->s6_addr32[3];
640 struct flowi fl = { .nl_u = { .ip4_u =
642 .saddr = tiph->saddr,
643 .tos = RT_TOS(tos) } },
644 .oif = tunnel->parms.link,
645 .proto = IPPROTO_IPV6 };
646 if (ip_route_output_key(&init_net, &rt, &fl)) {
647 tunnel->stat.tx_carrier_errors++;
651 if (rt->rt_type != RTN_UNICAST) {
653 tunnel->stat.tx_carrier_errors++;
656 tdev = rt->u.dst.dev;
660 tunnel->stat.collisions++;
665 mtu = dst_mtu(&rt->u.dst) - sizeof(struct iphdr);
667 mtu = skb->dst ? dst_mtu(skb->dst) : dev->mtu;
670 tunnel->stat.collisions++;
674 if (mtu < IPV6_MIN_MTU)
676 if (tunnel->parms.iph.daddr && skb->dst)
677 skb->dst->ops->update_pmtu(skb->dst, mtu);
679 if (skb->len > mtu) {
680 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev);
685 if (tunnel->err_count > 0) {
686 if (jiffies - tunnel->err_time < IPTUNNEL_ERR_TIMEO) {
688 dst_link_failure(skb);
690 tunnel->err_count = 0;
694 * Okay, now see if we can stuff it in the buffer as-is.
696 max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr);
698 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
699 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
700 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
709 skb_set_owner_w(new_skb, skb->sk);
712 iph6 = ipv6_hdr(skb);
715 skb->transport_header = skb->network_header;
716 skb_push(skb, sizeof(struct iphdr));
717 skb_reset_network_header(skb);
718 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
719 IPCB(skb)->flags = 0;
720 dst_release(skb->dst);
721 skb->dst = &rt->u.dst;
724 * Push down and install the IPIP header.
729 iph->ihl = sizeof(struct iphdr)>>2;
730 if (mtu > IPV6_MIN_MTU)
731 iph->frag_off = htons(IP_DF);
735 iph->protocol = IPPROTO_IPV6;
736 iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
737 iph->daddr = rt->rt_dst;
738 iph->saddr = rt->rt_src;
740 if ((iph->ttl = tiph->ttl) == 0)
741 iph->ttl = iph6->hop_limit;
750 dst_link_failure(skb);
758 static void ipip6_tunnel_bind_dev(struct net_device *dev)
760 struct net_device *tdev = NULL;
761 struct ip_tunnel *tunnel;
764 tunnel = netdev_priv(dev);
765 iph = &tunnel->parms.iph;
768 struct flowi fl = { .nl_u = { .ip4_u =
769 { .daddr = iph->daddr,
771 .tos = RT_TOS(iph->tos) } },
772 .oif = tunnel->parms.link,
773 .proto = IPPROTO_IPV6 };
775 if (!ip_route_output_key(&init_net, &rt, &fl)) {
776 tdev = rt->u.dst.dev;
779 dev->flags |= IFF_POINTOPOINT;
782 if (!tdev && tunnel->parms.link)
783 tdev = __dev_get_by_index(&init_net, tunnel->parms.link);
786 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
787 dev->mtu = tdev->mtu - sizeof(struct iphdr);
788 if (dev->mtu < IPV6_MIN_MTU)
789 dev->mtu = IPV6_MIN_MTU;
791 dev->iflink = tunnel->parms.link;
795 ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
798 struct ip_tunnel_parm p;
799 struct ip_tunnel_prl prl;
805 if (dev == ipip6_fb_tunnel_dev) {
806 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
810 t = ipip6_tunnel_locate(&p, 0);
813 t = netdev_priv(dev);
814 memcpy(&p, &t->parms, sizeof(p));
815 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
822 if (!capable(CAP_NET_ADMIN))
826 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
830 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 ||
831 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
834 p.iph.frag_off |= htons(IP_DF);
836 t = ipip6_tunnel_locate(&p, cmd == SIOCADDTUNNEL);
838 if (dev != ipip6_fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
845 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
846 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
850 t = netdev_priv(dev);
851 ipip6_tunnel_unlink(t);
852 t->parms.iph.saddr = p.iph.saddr;
853 t->parms.iph.daddr = p.iph.daddr;
854 memcpy(dev->dev_addr, &p.iph.saddr, 4);
855 memcpy(dev->broadcast, &p.iph.daddr, 4);
856 ipip6_tunnel_link(t);
857 netdev_state_change(dev);
863 if (cmd == SIOCCHGTUNNEL) {
864 t->parms.iph.ttl = p.iph.ttl;
865 t->parms.iph.tos = p.iph.tos;
866 if (t->parms.link != p.link) {
867 t->parms.link = p.link;
868 ipip6_tunnel_bind_dev(dev);
869 netdev_state_change(dev);
872 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
875 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
880 if (!capable(CAP_NET_ADMIN))
883 if (dev == ipip6_fb_tunnel_dev) {
885 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
888 if ((t = ipip6_tunnel_locate(&p, 0)) == NULL)
891 if (t == netdev_priv(ipip6_fb_tunnel_dev))
895 unregister_netdevice(dev);
903 if (!capable(CAP_NET_ADMIN))
906 if (dev == ipip6_fb_tunnel_dev)
909 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))
912 if (!(t = netdev_priv(dev)))
915 if (cmd == SIOCDELPRL)
916 err = ipip6_tunnel_del_prl(t, &prl);
918 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
919 netdev_state_change(dev);
930 static struct net_device_stats *ipip6_tunnel_get_stats(struct net_device *dev)
932 return &(((struct ip_tunnel*)netdev_priv(dev))->stat);
935 static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu)
937 if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr))
943 static void ipip6_tunnel_setup(struct net_device *dev)
945 dev->uninit = ipip6_tunnel_uninit;
946 dev->destructor = free_netdev;
947 dev->hard_start_xmit = ipip6_tunnel_xmit;
948 dev->get_stats = ipip6_tunnel_get_stats;
949 dev->do_ioctl = ipip6_tunnel_ioctl;
950 dev->change_mtu = ipip6_tunnel_change_mtu;
952 dev->type = ARPHRD_SIT;
953 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
954 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr);
955 dev->flags = IFF_NOARP;
960 static int ipip6_tunnel_init(struct net_device *dev)
962 struct ip_tunnel *tunnel;
964 tunnel = netdev_priv(dev);
967 strcpy(tunnel->parms.name, dev->name);
969 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
970 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
972 ipip6_tunnel_bind_dev(dev);
977 static int __init ipip6_fb_tunnel_init(struct net_device *dev)
979 struct ip_tunnel *tunnel = netdev_priv(dev);
980 struct iphdr *iph = &tunnel->parms.iph;
983 strcpy(tunnel->parms.name, dev->name);
986 iph->protocol = IPPROTO_IPV6;
991 tunnels_wc[0] = tunnel;
995 static struct xfrm_tunnel sit_handler = {
996 .handler = ipip6_rcv,
997 .err_handler = ipip6_err,
1001 static void __exit sit_destroy_tunnels(void)
1005 for (prio = 1; prio < 4; prio++) {
1007 for (h = 0; h < HASH_SIZE; h++) {
1008 struct ip_tunnel *t;
1009 while ((t = tunnels[prio][h]) != NULL)
1010 unregister_netdevice(t->dev);
1015 static void __exit sit_cleanup(void)
1017 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1020 sit_destroy_tunnels();
1021 unregister_netdevice(ipip6_fb_tunnel_dev);
1025 static int __init sit_init(void)
1029 printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n");
1031 if (xfrm4_tunnel_register(&sit_handler, AF_INET6) < 0) {
1032 printk(KERN_INFO "sit init: Can't add protocol\n");
1036 ipip6_fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
1037 ipip6_tunnel_setup);
1038 if (!ipip6_fb_tunnel_dev) {
1043 ipip6_fb_tunnel_dev->init = ipip6_fb_tunnel_init;
1045 if ((err = register_netdev(ipip6_fb_tunnel_dev)))
1051 free_netdev(ipip6_fb_tunnel_dev);
1053 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1057 module_init(sit_init);
1058 module_exit(sit_cleanup);
1059 MODULE_LICENSE("GPL");
1060 MODULE_ALIAS("sit0");