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)
212 static int ipip6_tunnel_get_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
214 struct ip_tunnel_prl *kp;
215 struct ip_tunnel_prl_entry *prl;
216 unsigned int cmax, c = 0, ca, len;
219 cmax = a->datalen / sizeof(*a);
220 if (cmax > 1 && a->addr != htonl(INADDR_ANY))
223 /* For simple GET or for root users,
224 * we try harder to allocate.
226 kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ?
227 kcalloc(cmax, sizeof(*kp), GFP_KERNEL) :
230 read_lock(&ipip6_lock);
232 ca = t->prl_count < cmax ? t->prl_count : cmax;
235 /* We don't try hard to allocate much memory for
237 * For root users, retry allocating enough memory for
240 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC);
248 for (prl = t->prl; prl; prl = prl->next) {
251 if (a->addr != htonl(INADDR_ANY) && prl->addr != a->addr)
253 kp[c].addr = prl->addr;
254 kp[c].flags = prl->flags;
256 if (a->addr != htonl(INADDR_ANY))
260 read_unlock(&ipip6_lock);
262 len = sizeof(*kp) * c;
263 ret = len ? copy_to_user(a->data, kp, len) : 0;
274 ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg)
276 struct ip_tunnel_prl_entry *p;
279 if (a->addr == htonl(INADDR_ANY))
282 write_lock(&ipip6_lock);
284 for (p = t->prl; p; p = p->next) {
285 if (p->addr == a->addr) {
298 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL);
311 write_unlock(&ipip6_lock);
316 ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
318 struct ip_tunnel_prl_entry *x, **p;
321 write_lock(&ipip6_lock);
323 if (a && a->addr != htonl(INADDR_ANY)) {
324 for (p = &t->prl; *p; p = &(*p)->next) {
325 if ((*p)->addr == a->addr) {
337 t->prl = t->prl->next;
343 write_unlock(&ipip6_lock);
348 isatap_chksrc(struct sk_buff *skb, struct iphdr *iph, struct ip_tunnel *t)
350 struct ip_tunnel_prl_entry *p;
353 read_lock(&ipip6_lock);
354 p = __ipip6_tunnel_locate_prl(t, iph->saddr);
356 if (p->flags & PRL_DEFAULT)
357 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT;
359 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT;
361 struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr;
362 if (ipv6_addr_is_isatap(addr6) &&
363 (addr6->s6_addr32[3] == iph->saddr) &&
364 ipv6_chk_prefix(addr6, t->dev))
365 skb->ndisc_nodetype = NDISC_NODETYPE_HOST;
369 read_unlock(&ipip6_lock);
373 static void ipip6_tunnel_uninit(struct net_device *dev)
375 if (dev == ipip6_fb_tunnel_dev) {
376 write_lock_bh(&ipip6_lock);
377 tunnels_wc[0] = NULL;
378 write_unlock_bh(&ipip6_lock);
381 ipip6_tunnel_unlink(netdev_priv(dev));
382 ipip6_tunnel_del_prl(netdev_priv(dev), NULL);
388 static int ipip6_err(struct sk_buff *skb, u32 info)
390 #ifndef I_WISH_WORLD_WERE_PERFECT
392 /* It is not :-( All the routers (except for Linux) return only
393 8 bytes of packet payload. It means, that precise relaying of
394 ICMP in the real Internet is absolutely infeasible.
396 struct iphdr *iph = (struct iphdr*)skb->data;
397 const int type = icmp_hdr(skb)->type;
398 const int code = icmp_hdr(skb)->code;
404 case ICMP_PARAMETERPROB:
407 case ICMP_DEST_UNREACH:
410 case ICMP_PORT_UNREACH:
411 /* Impossible event. */
413 case ICMP_FRAG_NEEDED:
414 /* Soft state for pmtu is maintained by IP core. */
417 /* All others are translated to HOST_UNREACH.
418 rfc2003 contains "deep thoughts" about NET_UNREACH,
419 I believe they are just ether pollution. --ANK
424 case ICMP_TIME_EXCEEDED:
425 if (code != ICMP_EXC_TTL)
432 read_lock(&ipip6_lock);
433 t = ipip6_tunnel_lookup(iph->daddr, iph->saddr);
434 if (t == NULL || t->parms.iph.daddr == 0)
438 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
441 if (jiffies - t->err_time < IPTUNNEL_ERR_TIMEO)
445 t->err_time = jiffies;
447 read_unlock(&ipip6_lock);
450 struct iphdr *iph = (struct iphdr*)dp;
451 int hlen = iph->ihl<<2;
452 struct ipv6hdr *iph6;
453 const int type = icmp_hdr(skb)->type;
454 const int code = icmp_hdr(skb)->code;
458 struct sk_buff *skb2;
459 struct rt6_info *rt6i;
461 if (len < hlen + sizeof(struct ipv6hdr))
463 iph6 = (struct ipv6hdr*)(dp + hlen);
468 case ICMP_PARAMETERPROB:
469 if (icmp_hdr(skb)->un.gateway < hlen)
472 /* So... This guy found something strange INSIDE encapsulated
473 packet. Well, he is fool, but what can we do ?
475 rel_type = ICMPV6_PARAMPROB;
476 rel_info = icmp_hdr(skb)->un.gateway - hlen;
479 case ICMP_DEST_UNREACH:
482 case ICMP_PORT_UNREACH:
483 /* Impossible event. */
485 case ICMP_FRAG_NEEDED:
486 /* Too complicated case ... */
489 /* All others are translated to HOST_UNREACH.
490 rfc2003 contains "deep thoughts" about NET_UNREACH,
491 I believe, it is just ether pollution. --ANK
493 rel_type = ICMPV6_DEST_UNREACH;
494 rel_code = ICMPV6_ADDR_UNREACH;
498 case ICMP_TIME_EXCEEDED:
499 if (code != ICMP_EXC_TTL)
501 rel_type = ICMPV6_TIME_EXCEED;
502 rel_code = ICMPV6_EXC_HOPLIMIT;
506 /* Prepare fake skb to feed it to icmpv6_send */
507 skb2 = skb_clone(skb, GFP_ATOMIC);
510 dst_release(skb2->dst);
512 skb_pull(skb2, skb->data - (u8*)iph6);
513 skb_reset_network_header(skb2);
515 /* Try to guess incoming interface */
516 rt6i = rt6_lookup(&init_net, &iph6->saddr, NULL, NULL, 0);
517 if (rt6i && rt6i->rt6i_dev) {
518 skb2->dev = rt6i->rt6i_dev;
520 rt6i = rt6_lookup(&init_net, &iph6->daddr, &iph6->saddr, NULL, 0);
522 if (rt6i && rt6i->rt6i_dev && rt6i->rt6i_dev->type == ARPHRD_SIT) {
523 struct ip_tunnel *t = netdev_priv(rt6i->rt6i_dev);
524 if (rel_type == ICMPV6_TIME_EXCEED && t->parms.iph.ttl) {
525 rel_type = ICMPV6_DEST_UNREACH;
526 rel_code = ICMPV6_ADDR_UNREACH;
528 icmpv6_send(skb2, rel_type, rel_code, rel_info, skb2->dev);
536 static inline void ipip6_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb)
538 if (INET_ECN_is_ce(iph->tos))
539 IP6_ECN_set_ce(ipv6_hdr(skb));
542 static int ipip6_rcv(struct sk_buff *skb)
545 struct ip_tunnel *tunnel;
547 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
552 read_lock(&ipip6_lock);
553 if ((tunnel = ipip6_tunnel_lookup(iph->saddr, iph->daddr)) != NULL) {
555 skb->mac_header = skb->network_header;
556 skb_reset_network_header(skb);
557 IPCB(skb)->flags = 0;
558 skb->protocol = htons(ETH_P_IPV6);
559 skb->pkt_type = PACKET_HOST;
561 if ((tunnel->dev->priv_flags & IFF_ISATAP) &&
562 !isatap_chksrc(skb, iph, tunnel)) {
563 tunnel->stat.rx_errors++;
564 read_unlock(&ipip6_lock);
568 tunnel->stat.rx_packets++;
569 tunnel->stat.rx_bytes += skb->len;
570 skb->dev = tunnel->dev;
571 dst_release(skb->dst);
574 ipip6_ecn_decapsulate(iph, skb);
576 read_unlock(&ipip6_lock);
580 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
582 read_unlock(&ipip6_lock);
587 /* Returns the embedded IPv4 address if the IPv6 address
588 comes from 6to4 (RFC 3056) addr space */
590 static inline __be32 try_6to4(struct in6_addr *v6dst)
594 if (v6dst->s6_addr16[0] == htons(0x2002)) {
595 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
596 memcpy(&dst, &v6dst->s6_addr16[1], 4);
602 * This function assumes it is being called from dev_queue_xmit()
603 * and that skb is filled properly by that function.
606 static int ipip6_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
608 struct ip_tunnel *tunnel = netdev_priv(dev);
609 struct net_device_stats *stats = &tunnel->stat;
610 struct iphdr *tiph = &tunnel->parms.iph;
611 struct ipv6hdr *iph6 = ipv6_hdr(skb);
612 u8 tos = tunnel->parms.iph.tos;
613 struct rtable *rt; /* Route to the other host */
614 struct net_device *tdev; /* Device to other host */
615 struct iphdr *iph; /* Our new IP header */
616 unsigned int max_headroom; /* The extra header space needed */
617 __be32 dst = tiph->daddr;
619 struct in6_addr *addr6;
622 if (tunnel->recursion++) {
623 tunnel->stat.collisions++;
627 if (skb->protocol != htons(ETH_P_IPV6))
630 /* ISATAP (RFC4214) - must come before 6to4 */
631 if (dev->priv_flags & IFF_ISATAP) {
632 struct neighbour *neigh = NULL;
635 neigh = skb->dst->neighbour;
639 printk(KERN_DEBUG "sit: nexthop == NULL\n");
643 addr6 = (struct in6_addr*)&neigh->primary_key;
644 addr_type = ipv6_addr_type(addr6);
646 if ((addr_type & IPV6_ADDR_UNICAST) &&
647 ipv6_addr_is_isatap(addr6))
648 dst = addr6->s6_addr32[3];
654 dst = try_6to4(&iph6->daddr);
657 struct neighbour *neigh = NULL;
660 neigh = skb->dst->neighbour;
664 printk(KERN_DEBUG "sit: nexthop == NULL\n");
668 addr6 = (struct in6_addr*)&neigh->primary_key;
669 addr_type = ipv6_addr_type(addr6);
671 if (addr_type == IPV6_ADDR_ANY) {
672 addr6 = &ipv6_hdr(skb)->daddr;
673 addr_type = ipv6_addr_type(addr6);
676 if ((addr_type & IPV6_ADDR_COMPATv4) == 0)
679 dst = addr6->s6_addr32[3];
683 struct flowi fl = { .nl_u = { .ip4_u =
685 .saddr = tiph->saddr,
686 .tos = RT_TOS(tos) } },
687 .oif = tunnel->parms.link,
688 .proto = IPPROTO_IPV6 };
689 if (ip_route_output_key(&init_net, &rt, &fl)) {
690 tunnel->stat.tx_carrier_errors++;
694 if (rt->rt_type != RTN_UNICAST) {
696 tunnel->stat.tx_carrier_errors++;
699 tdev = rt->u.dst.dev;
703 tunnel->stat.collisions++;
708 mtu = dst_mtu(&rt->u.dst) - sizeof(struct iphdr);
710 mtu = skb->dst ? dst_mtu(skb->dst) : dev->mtu;
713 tunnel->stat.collisions++;
717 if (mtu < IPV6_MIN_MTU)
719 if (tunnel->parms.iph.daddr && skb->dst)
720 skb->dst->ops->update_pmtu(skb->dst, mtu);
722 if (skb->len > mtu) {
723 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev);
728 if (tunnel->err_count > 0) {
729 if (jiffies - tunnel->err_time < IPTUNNEL_ERR_TIMEO) {
731 dst_link_failure(skb);
733 tunnel->err_count = 0;
737 * Okay, now see if we can stuff it in the buffer as-is.
739 max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr);
741 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
742 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
743 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
752 skb_set_owner_w(new_skb, skb->sk);
755 iph6 = ipv6_hdr(skb);
758 skb->transport_header = skb->network_header;
759 skb_push(skb, sizeof(struct iphdr));
760 skb_reset_network_header(skb);
761 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
762 IPCB(skb)->flags = 0;
763 dst_release(skb->dst);
764 skb->dst = &rt->u.dst;
767 * Push down and install the IPIP header.
772 iph->ihl = sizeof(struct iphdr)>>2;
773 if (mtu > IPV6_MIN_MTU)
774 iph->frag_off = htons(IP_DF);
778 iph->protocol = IPPROTO_IPV6;
779 iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
780 iph->daddr = rt->rt_dst;
781 iph->saddr = rt->rt_src;
783 if ((iph->ttl = tiph->ttl) == 0)
784 iph->ttl = iph6->hop_limit;
793 dst_link_failure(skb);
801 static void ipip6_tunnel_bind_dev(struct net_device *dev)
803 struct net_device *tdev = NULL;
804 struct ip_tunnel *tunnel;
807 tunnel = netdev_priv(dev);
808 iph = &tunnel->parms.iph;
811 struct flowi fl = { .nl_u = { .ip4_u =
812 { .daddr = iph->daddr,
814 .tos = RT_TOS(iph->tos) } },
815 .oif = tunnel->parms.link,
816 .proto = IPPROTO_IPV6 };
818 if (!ip_route_output_key(&init_net, &rt, &fl)) {
819 tdev = rt->u.dst.dev;
822 dev->flags |= IFF_POINTOPOINT;
825 if (!tdev && tunnel->parms.link)
826 tdev = __dev_get_by_index(&init_net, tunnel->parms.link);
829 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
830 dev->mtu = tdev->mtu - sizeof(struct iphdr);
831 if (dev->mtu < IPV6_MIN_MTU)
832 dev->mtu = IPV6_MIN_MTU;
834 dev->iflink = tunnel->parms.link;
838 ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
841 struct ip_tunnel_parm p;
842 struct ip_tunnel_prl prl;
848 if (dev == ipip6_fb_tunnel_dev) {
849 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
853 t = ipip6_tunnel_locate(&p, 0);
856 t = netdev_priv(dev);
857 memcpy(&p, &t->parms, sizeof(p));
858 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
865 if (!capable(CAP_NET_ADMIN))
869 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
873 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 ||
874 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
877 p.iph.frag_off |= htons(IP_DF);
879 t = ipip6_tunnel_locate(&p, cmd == SIOCADDTUNNEL);
881 if (dev != ipip6_fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
888 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
889 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
893 t = netdev_priv(dev);
894 ipip6_tunnel_unlink(t);
895 t->parms.iph.saddr = p.iph.saddr;
896 t->parms.iph.daddr = p.iph.daddr;
897 memcpy(dev->dev_addr, &p.iph.saddr, 4);
898 memcpy(dev->broadcast, &p.iph.daddr, 4);
899 ipip6_tunnel_link(t);
900 netdev_state_change(dev);
906 if (cmd == SIOCCHGTUNNEL) {
907 t->parms.iph.ttl = p.iph.ttl;
908 t->parms.iph.tos = p.iph.tos;
909 if (t->parms.link != p.link) {
910 t->parms.link = p.link;
911 ipip6_tunnel_bind_dev(dev);
912 netdev_state_change(dev);
915 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
918 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
923 if (!capable(CAP_NET_ADMIN))
926 if (dev == ipip6_fb_tunnel_dev) {
928 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
931 if ((t = ipip6_tunnel_locate(&p, 0)) == NULL)
934 if (t == netdev_priv(ipip6_fb_tunnel_dev))
938 unregister_netdevice(dev);
947 if (cmd != SIOCGETPRL && !capable(CAP_NET_ADMIN))
950 if (dev == ipip6_fb_tunnel_dev)
953 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))
956 if (!(t = netdev_priv(dev)))
961 err = ipip6_tunnel_get_prl(t, &prl);
962 if (!err && copy_to_user(ifr->ifr_ifru.ifru_data,
967 err = ipip6_tunnel_del_prl(t, &prl);
971 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
974 if (cmd != SIOCGETPRL)
975 netdev_state_change(dev);
986 static struct net_device_stats *ipip6_tunnel_get_stats(struct net_device *dev)
988 return &(((struct ip_tunnel*)netdev_priv(dev))->stat);
991 static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu)
993 if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr))
999 static void ipip6_tunnel_setup(struct net_device *dev)
1001 dev->uninit = ipip6_tunnel_uninit;
1002 dev->destructor = free_netdev;
1003 dev->hard_start_xmit = ipip6_tunnel_xmit;
1004 dev->get_stats = ipip6_tunnel_get_stats;
1005 dev->do_ioctl = ipip6_tunnel_ioctl;
1006 dev->change_mtu = ipip6_tunnel_change_mtu;
1008 dev->type = ARPHRD_SIT;
1009 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
1010 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr);
1011 dev->flags = IFF_NOARP;
1016 static int ipip6_tunnel_init(struct net_device *dev)
1018 struct ip_tunnel *tunnel;
1020 tunnel = netdev_priv(dev);
1023 strcpy(tunnel->parms.name, dev->name);
1025 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
1026 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
1028 ipip6_tunnel_bind_dev(dev);
1033 static int __init ipip6_fb_tunnel_init(struct net_device *dev)
1035 struct ip_tunnel *tunnel = netdev_priv(dev);
1036 struct iphdr *iph = &tunnel->parms.iph;
1039 strcpy(tunnel->parms.name, dev->name);
1042 iph->protocol = IPPROTO_IPV6;
1047 tunnels_wc[0] = tunnel;
1051 static struct xfrm_tunnel sit_handler = {
1052 .handler = ipip6_rcv,
1053 .err_handler = ipip6_err,
1057 static void __exit sit_destroy_tunnels(void)
1061 for (prio = 1; prio < 4; prio++) {
1063 for (h = 0; h < HASH_SIZE; h++) {
1064 struct ip_tunnel *t;
1065 while ((t = tunnels[prio][h]) != NULL)
1066 unregister_netdevice(t->dev);
1071 static void __exit sit_cleanup(void)
1073 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1076 sit_destroy_tunnels();
1077 unregister_netdevice(ipip6_fb_tunnel_dev);
1081 static int __init sit_init(void)
1085 printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n");
1087 if (xfrm4_tunnel_register(&sit_handler, AF_INET6) < 0) {
1088 printk(KERN_INFO "sit init: Can't add protocol\n");
1092 ipip6_fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
1093 ipip6_tunnel_setup);
1094 if (!ipip6_fb_tunnel_dev) {
1099 ipip6_fb_tunnel_dev->init = ipip6_fb_tunnel_init;
1101 if ((err = register_netdev(ipip6_fb_tunnel_dev)))
1107 free_netdev(ipip6_fb_tunnel_dev);
1109 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1113 module_init(sit_init);
1114 module_exit(sit_cleanup);
1115 MODULE_LICENSE("GPL");
1116 MODULE_ALIAS("sit0");