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>
55 #include <net/net_namespace.h>
56 #include <net/netns/generic.h>
59 This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c
61 For comments look at net/ipv4/ip_gre.c --ANK
65 #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)
67 static int ipip6_fb_tunnel_init(struct net_device *dev);
68 static int ipip6_tunnel_init(struct net_device *dev);
69 static void ipip6_tunnel_setup(struct net_device *dev);
71 static int sit_net_id;
75 static struct net_device *ipip6_fb_tunnel_dev;
77 static struct ip_tunnel *tunnels_r_l[HASH_SIZE];
78 static struct ip_tunnel *tunnels_r[HASH_SIZE];
79 static struct ip_tunnel *tunnels_l[HASH_SIZE];
80 static struct ip_tunnel *tunnels_wc[1];
81 static struct ip_tunnel **tunnels[4] = { tunnels_wc, tunnels_l, tunnels_r, tunnels_r_l };
83 static DEFINE_RWLOCK(ipip6_lock);
85 static struct ip_tunnel * ipip6_tunnel_lookup(__be32 remote, __be32 local)
87 unsigned h0 = HASH(remote);
88 unsigned h1 = HASH(local);
91 for (t = tunnels_r_l[h0^h1]; t; t = t->next) {
92 if (local == t->parms.iph.saddr &&
93 remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP))
96 for (t = tunnels_r[h0]; t; t = t->next) {
97 if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP))
100 for (t = tunnels_l[h1]; t; t = t->next) {
101 if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP))
104 if ((t = tunnels_wc[0]) != NULL && (t->dev->flags&IFF_UP))
109 static struct ip_tunnel **__ipip6_bucket(struct ip_tunnel_parm *parms)
111 __be32 remote = parms->iph.daddr;
112 __be32 local = parms->iph.saddr;
124 return &tunnels[prio][h];
127 static inline struct ip_tunnel **ipip6_bucket(struct ip_tunnel *t)
129 return __ipip6_bucket(&t->parms);
132 static void ipip6_tunnel_unlink(struct ip_tunnel *t)
134 struct ip_tunnel **tp;
136 for (tp = ipip6_bucket(t); *tp; tp = &(*tp)->next) {
138 write_lock_bh(&ipip6_lock);
140 write_unlock_bh(&ipip6_lock);
146 static void ipip6_tunnel_link(struct ip_tunnel *t)
148 struct ip_tunnel **tp = ipip6_bucket(t);
151 write_lock_bh(&ipip6_lock);
153 write_unlock_bh(&ipip6_lock);
156 static struct ip_tunnel * ipip6_tunnel_locate(struct ip_tunnel_parm *parms, int create)
158 __be32 remote = parms->iph.daddr;
159 __be32 local = parms->iph.saddr;
160 struct ip_tunnel *t, **tp, *nt;
161 struct net_device *dev;
164 for (tp = __ipip6_bucket(parms); (t = *tp) != NULL; tp = &t->next) {
165 if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr)
172 strlcpy(name, parms->name, IFNAMSIZ);
174 sprintf(name, "sit%%d");
176 dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup);
180 if (strchr(name, '%')) {
181 if (dev_alloc_name(dev, name) < 0)
185 nt = netdev_priv(dev);
186 dev->init = ipip6_tunnel_init;
189 if (parms->i_flags & SIT_ISATAP)
190 dev->priv_flags |= IFF_ISATAP;
192 if (register_netdevice(dev) < 0)
197 ipip6_tunnel_link(nt);
206 static struct ip_tunnel_prl_entry *
207 __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr)
209 struct ip_tunnel_prl_entry *p = (struct ip_tunnel_prl_entry *)NULL;
211 for (p = t->prl; p; p = p->next)
218 static int ipip6_tunnel_get_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
220 struct ip_tunnel_prl *kp;
221 struct ip_tunnel_prl_entry *prl;
222 unsigned int cmax, c = 0, ca, len;
225 cmax = a->datalen / sizeof(*a);
226 if (cmax > 1 && a->addr != htonl(INADDR_ANY))
229 /* For simple GET or for root users,
230 * we try harder to allocate.
232 kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ?
233 kcalloc(cmax, sizeof(*kp), GFP_KERNEL) :
236 read_lock(&ipip6_lock);
238 ca = t->prl_count < cmax ? t->prl_count : cmax;
241 /* We don't try hard to allocate much memory for
243 * For root users, retry allocating enough memory for
246 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC);
254 for (prl = t->prl; prl; prl = prl->next) {
257 if (a->addr != htonl(INADDR_ANY) && prl->addr != a->addr)
259 kp[c].addr = prl->addr;
260 kp[c].flags = prl->flags;
262 if (a->addr != htonl(INADDR_ANY))
266 read_unlock(&ipip6_lock);
268 len = sizeof(*kp) * c;
269 ret = len ? copy_to_user(a->data, kp, len) : 0;
280 ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg)
282 struct ip_tunnel_prl_entry *p;
285 if (a->addr == htonl(INADDR_ANY))
288 write_lock(&ipip6_lock);
290 for (p = t->prl; p; p = p->next) {
291 if (p->addr == a->addr) {
304 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL);
317 write_unlock(&ipip6_lock);
322 ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
324 struct ip_tunnel_prl_entry *x, **p;
327 write_lock(&ipip6_lock);
329 if (a && a->addr != htonl(INADDR_ANY)) {
330 for (p = &t->prl; *p; p = &(*p)->next) {
331 if ((*p)->addr == a->addr) {
343 t->prl = t->prl->next;
349 write_unlock(&ipip6_lock);
354 isatap_chksrc(struct sk_buff *skb, struct iphdr *iph, struct ip_tunnel *t)
356 struct ip_tunnel_prl_entry *p;
359 read_lock(&ipip6_lock);
360 p = __ipip6_tunnel_locate_prl(t, iph->saddr);
362 if (p->flags & PRL_DEFAULT)
363 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT;
365 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT;
367 struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr;
368 if (ipv6_addr_is_isatap(addr6) &&
369 (addr6->s6_addr32[3] == iph->saddr) &&
370 ipv6_chk_prefix(addr6, t->dev))
371 skb->ndisc_nodetype = NDISC_NODETYPE_HOST;
375 read_unlock(&ipip6_lock);
379 static void ipip6_tunnel_uninit(struct net_device *dev)
381 if (dev == ipip6_fb_tunnel_dev) {
382 write_lock_bh(&ipip6_lock);
383 tunnels_wc[0] = NULL;
384 write_unlock_bh(&ipip6_lock);
387 ipip6_tunnel_unlink(netdev_priv(dev));
388 ipip6_tunnel_del_prl(netdev_priv(dev), NULL);
394 static int ipip6_err(struct sk_buff *skb, u32 info)
396 #ifndef I_WISH_WORLD_WERE_PERFECT
398 /* It is not :-( All the routers (except for Linux) return only
399 8 bytes of packet payload. It means, that precise relaying of
400 ICMP in the real Internet is absolutely infeasible.
402 struct iphdr *iph = (struct iphdr*)skb->data;
403 const int type = icmp_hdr(skb)->type;
404 const int code = icmp_hdr(skb)->code;
410 case ICMP_PARAMETERPROB:
413 case ICMP_DEST_UNREACH:
416 case ICMP_PORT_UNREACH:
417 /* Impossible event. */
419 case ICMP_FRAG_NEEDED:
420 /* Soft state for pmtu is maintained by IP core. */
423 /* All others are translated to HOST_UNREACH.
424 rfc2003 contains "deep thoughts" about NET_UNREACH,
425 I believe they are just ether pollution. --ANK
430 case ICMP_TIME_EXCEEDED:
431 if (code != ICMP_EXC_TTL)
438 read_lock(&ipip6_lock);
439 t = ipip6_tunnel_lookup(iph->daddr, iph->saddr);
440 if (t == NULL || t->parms.iph.daddr == 0)
444 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
447 if (jiffies - t->err_time < IPTUNNEL_ERR_TIMEO)
451 t->err_time = jiffies;
453 read_unlock(&ipip6_lock);
456 struct iphdr *iph = (struct iphdr*)dp;
457 int hlen = iph->ihl<<2;
458 struct ipv6hdr *iph6;
459 const int type = icmp_hdr(skb)->type;
460 const int code = icmp_hdr(skb)->code;
464 struct sk_buff *skb2;
465 struct rt6_info *rt6i;
467 if (len < hlen + sizeof(struct ipv6hdr))
469 iph6 = (struct ipv6hdr*)(dp + hlen);
474 case ICMP_PARAMETERPROB:
475 if (icmp_hdr(skb)->un.gateway < hlen)
478 /* So... This guy found something strange INSIDE encapsulated
479 packet. Well, he is fool, but what can we do ?
481 rel_type = ICMPV6_PARAMPROB;
482 rel_info = icmp_hdr(skb)->un.gateway - hlen;
485 case ICMP_DEST_UNREACH:
488 case ICMP_PORT_UNREACH:
489 /* Impossible event. */
491 case ICMP_FRAG_NEEDED:
492 /* Too complicated case ... */
495 /* All others are translated to HOST_UNREACH.
496 rfc2003 contains "deep thoughts" about NET_UNREACH,
497 I believe, it is just ether pollution. --ANK
499 rel_type = ICMPV6_DEST_UNREACH;
500 rel_code = ICMPV6_ADDR_UNREACH;
504 case ICMP_TIME_EXCEEDED:
505 if (code != ICMP_EXC_TTL)
507 rel_type = ICMPV6_TIME_EXCEED;
508 rel_code = ICMPV6_EXC_HOPLIMIT;
512 /* Prepare fake skb to feed it to icmpv6_send */
513 skb2 = skb_clone(skb, GFP_ATOMIC);
516 dst_release(skb2->dst);
518 skb_pull(skb2, skb->data - (u8*)iph6);
519 skb_reset_network_header(skb2);
521 /* Try to guess incoming interface */
522 rt6i = rt6_lookup(&init_net, &iph6->saddr, NULL, NULL, 0);
523 if (rt6i && rt6i->rt6i_dev) {
524 skb2->dev = rt6i->rt6i_dev;
526 rt6i = rt6_lookup(&init_net, &iph6->daddr, &iph6->saddr, NULL, 0);
528 if (rt6i && rt6i->rt6i_dev && rt6i->rt6i_dev->type == ARPHRD_SIT) {
529 struct ip_tunnel *t = netdev_priv(rt6i->rt6i_dev);
530 if (rel_type == ICMPV6_TIME_EXCEED && t->parms.iph.ttl) {
531 rel_type = ICMPV6_DEST_UNREACH;
532 rel_code = ICMPV6_ADDR_UNREACH;
534 icmpv6_send(skb2, rel_type, rel_code, rel_info, skb2->dev);
542 static inline void ipip6_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb)
544 if (INET_ECN_is_ce(iph->tos))
545 IP6_ECN_set_ce(ipv6_hdr(skb));
548 static int ipip6_rcv(struct sk_buff *skb)
551 struct ip_tunnel *tunnel;
553 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
558 read_lock(&ipip6_lock);
559 if ((tunnel = ipip6_tunnel_lookup(iph->saddr, iph->daddr)) != NULL) {
561 skb->mac_header = skb->network_header;
562 skb_reset_network_header(skb);
563 IPCB(skb)->flags = 0;
564 skb->protocol = htons(ETH_P_IPV6);
565 skb->pkt_type = PACKET_HOST;
567 if ((tunnel->dev->priv_flags & IFF_ISATAP) &&
568 !isatap_chksrc(skb, iph, tunnel)) {
569 tunnel->stat.rx_errors++;
570 read_unlock(&ipip6_lock);
574 tunnel->stat.rx_packets++;
575 tunnel->stat.rx_bytes += skb->len;
576 skb->dev = tunnel->dev;
577 dst_release(skb->dst);
580 ipip6_ecn_decapsulate(iph, skb);
582 read_unlock(&ipip6_lock);
586 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
588 read_unlock(&ipip6_lock);
593 /* Returns the embedded IPv4 address if the IPv6 address
594 comes from 6to4 (RFC 3056) addr space */
596 static inline __be32 try_6to4(struct in6_addr *v6dst)
600 if (v6dst->s6_addr16[0] == htons(0x2002)) {
601 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
602 memcpy(&dst, &v6dst->s6_addr16[1], 4);
608 * This function assumes it is being called from dev_queue_xmit()
609 * and that skb is filled properly by that function.
612 static int ipip6_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
614 struct ip_tunnel *tunnel = netdev_priv(dev);
615 struct net_device_stats *stats = &tunnel->stat;
616 struct iphdr *tiph = &tunnel->parms.iph;
617 struct ipv6hdr *iph6 = ipv6_hdr(skb);
618 u8 tos = tunnel->parms.iph.tos;
619 struct rtable *rt; /* Route to the other host */
620 struct net_device *tdev; /* Device to other host */
621 struct iphdr *iph; /* Our new IP header */
622 unsigned int max_headroom; /* The extra header space needed */
623 __be32 dst = tiph->daddr;
625 struct in6_addr *addr6;
628 if (tunnel->recursion++) {
629 tunnel->stat.collisions++;
633 if (skb->protocol != htons(ETH_P_IPV6))
636 /* ISATAP (RFC4214) - must come before 6to4 */
637 if (dev->priv_flags & IFF_ISATAP) {
638 struct neighbour *neigh = NULL;
641 neigh = skb->dst->neighbour;
645 printk(KERN_DEBUG "sit: nexthop == NULL\n");
649 addr6 = (struct in6_addr*)&neigh->primary_key;
650 addr_type = ipv6_addr_type(addr6);
652 if ((addr_type & IPV6_ADDR_UNICAST) &&
653 ipv6_addr_is_isatap(addr6))
654 dst = addr6->s6_addr32[3];
660 dst = try_6to4(&iph6->daddr);
663 struct neighbour *neigh = NULL;
666 neigh = skb->dst->neighbour;
670 printk(KERN_DEBUG "sit: nexthop == NULL\n");
674 addr6 = (struct in6_addr*)&neigh->primary_key;
675 addr_type = ipv6_addr_type(addr6);
677 if (addr_type == IPV6_ADDR_ANY) {
678 addr6 = &ipv6_hdr(skb)->daddr;
679 addr_type = ipv6_addr_type(addr6);
682 if ((addr_type & IPV6_ADDR_COMPATv4) == 0)
685 dst = addr6->s6_addr32[3];
689 struct flowi fl = { .nl_u = { .ip4_u =
691 .saddr = tiph->saddr,
692 .tos = RT_TOS(tos) } },
693 .oif = tunnel->parms.link,
694 .proto = IPPROTO_IPV6 };
695 if (ip_route_output_key(&init_net, &rt, &fl)) {
696 tunnel->stat.tx_carrier_errors++;
700 if (rt->rt_type != RTN_UNICAST) {
702 tunnel->stat.tx_carrier_errors++;
705 tdev = rt->u.dst.dev;
709 tunnel->stat.collisions++;
714 mtu = dst_mtu(&rt->u.dst) - sizeof(struct iphdr);
716 mtu = skb->dst ? dst_mtu(skb->dst) : dev->mtu;
719 tunnel->stat.collisions++;
723 if (mtu < IPV6_MIN_MTU)
725 if (tunnel->parms.iph.daddr && skb->dst)
726 skb->dst->ops->update_pmtu(skb->dst, mtu);
728 if (skb->len > mtu) {
729 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev);
734 if (tunnel->err_count > 0) {
735 if (jiffies - tunnel->err_time < IPTUNNEL_ERR_TIMEO) {
737 dst_link_failure(skb);
739 tunnel->err_count = 0;
743 * Okay, now see if we can stuff it in the buffer as-is.
745 max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr);
747 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
748 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
749 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
758 skb_set_owner_w(new_skb, skb->sk);
761 iph6 = ipv6_hdr(skb);
764 skb->transport_header = skb->network_header;
765 skb_push(skb, sizeof(struct iphdr));
766 skb_reset_network_header(skb);
767 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
768 IPCB(skb)->flags = 0;
769 dst_release(skb->dst);
770 skb->dst = &rt->u.dst;
773 * Push down and install the IPIP header.
778 iph->ihl = sizeof(struct iphdr)>>2;
779 if (mtu > IPV6_MIN_MTU)
780 iph->frag_off = htons(IP_DF);
784 iph->protocol = IPPROTO_IPV6;
785 iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
786 iph->daddr = rt->rt_dst;
787 iph->saddr = rt->rt_src;
789 if ((iph->ttl = tiph->ttl) == 0)
790 iph->ttl = iph6->hop_limit;
799 dst_link_failure(skb);
807 static void ipip6_tunnel_bind_dev(struct net_device *dev)
809 struct net_device *tdev = NULL;
810 struct ip_tunnel *tunnel;
813 tunnel = netdev_priv(dev);
814 iph = &tunnel->parms.iph;
817 struct flowi fl = { .nl_u = { .ip4_u =
818 { .daddr = iph->daddr,
820 .tos = RT_TOS(iph->tos) } },
821 .oif = tunnel->parms.link,
822 .proto = IPPROTO_IPV6 };
824 if (!ip_route_output_key(&init_net, &rt, &fl)) {
825 tdev = rt->u.dst.dev;
828 dev->flags |= IFF_POINTOPOINT;
831 if (!tdev && tunnel->parms.link)
832 tdev = __dev_get_by_index(&init_net, tunnel->parms.link);
835 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
836 dev->mtu = tdev->mtu - sizeof(struct iphdr);
837 if (dev->mtu < IPV6_MIN_MTU)
838 dev->mtu = IPV6_MIN_MTU;
840 dev->iflink = tunnel->parms.link;
844 ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
847 struct ip_tunnel_parm p;
848 struct ip_tunnel_prl prl;
854 if (dev == ipip6_fb_tunnel_dev) {
855 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
859 t = ipip6_tunnel_locate(&p, 0);
862 t = netdev_priv(dev);
863 memcpy(&p, &t->parms, sizeof(p));
864 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
871 if (!capable(CAP_NET_ADMIN))
875 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
879 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 ||
880 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
883 p.iph.frag_off |= htons(IP_DF);
885 t = ipip6_tunnel_locate(&p, cmd == SIOCADDTUNNEL);
887 if (dev != ipip6_fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
894 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
895 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
899 t = netdev_priv(dev);
900 ipip6_tunnel_unlink(t);
901 t->parms.iph.saddr = p.iph.saddr;
902 t->parms.iph.daddr = p.iph.daddr;
903 memcpy(dev->dev_addr, &p.iph.saddr, 4);
904 memcpy(dev->broadcast, &p.iph.daddr, 4);
905 ipip6_tunnel_link(t);
906 netdev_state_change(dev);
912 if (cmd == SIOCCHGTUNNEL) {
913 t->parms.iph.ttl = p.iph.ttl;
914 t->parms.iph.tos = p.iph.tos;
915 if (t->parms.link != p.link) {
916 t->parms.link = p.link;
917 ipip6_tunnel_bind_dev(dev);
918 netdev_state_change(dev);
921 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
924 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
929 if (!capable(CAP_NET_ADMIN))
932 if (dev == ipip6_fb_tunnel_dev) {
934 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
937 if ((t = ipip6_tunnel_locate(&p, 0)) == NULL)
940 if (t == netdev_priv(ipip6_fb_tunnel_dev))
944 unregister_netdevice(dev);
953 if (cmd != SIOCGETPRL && !capable(CAP_NET_ADMIN))
956 if (dev == ipip6_fb_tunnel_dev)
959 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))
962 if (!(t = netdev_priv(dev)))
967 err = ipip6_tunnel_get_prl(t, &prl);
968 if (!err && copy_to_user(ifr->ifr_ifru.ifru_data,
973 err = ipip6_tunnel_del_prl(t, &prl);
977 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
980 if (cmd != SIOCGETPRL)
981 netdev_state_change(dev);
992 static struct net_device_stats *ipip6_tunnel_get_stats(struct net_device *dev)
994 return &(((struct ip_tunnel*)netdev_priv(dev))->stat);
997 static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu)
999 if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr))
1005 static void ipip6_tunnel_setup(struct net_device *dev)
1007 dev->uninit = ipip6_tunnel_uninit;
1008 dev->destructor = free_netdev;
1009 dev->hard_start_xmit = ipip6_tunnel_xmit;
1010 dev->get_stats = ipip6_tunnel_get_stats;
1011 dev->do_ioctl = ipip6_tunnel_ioctl;
1012 dev->change_mtu = ipip6_tunnel_change_mtu;
1014 dev->type = ARPHRD_SIT;
1015 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
1016 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr);
1017 dev->flags = IFF_NOARP;
1022 static int ipip6_tunnel_init(struct net_device *dev)
1024 struct ip_tunnel *tunnel;
1026 tunnel = netdev_priv(dev);
1029 strcpy(tunnel->parms.name, dev->name);
1031 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
1032 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
1034 ipip6_tunnel_bind_dev(dev);
1039 static int __init ipip6_fb_tunnel_init(struct net_device *dev)
1041 struct ip_tunnel *tunnel = netdev_priv(dev);
1042 struct iphdr *iph = &tunnel->parms.iph;
1045 strcpy(tunnel->parms.name, dev->name);
1048 iph->protocol = IPPROTO_IPV6;
1053 tunnels_wc[0] = tunnel;
1057 static struct xfrm_tunnel sit_handler = {
1058 .handler = ipip6_rcv,
1059 .err_handler = ipip6_err,
1063 static void __exit sit_destroy_tunnels(void)
1067 for (prio = 1; prio < 4; prio++) {
1069 for (h = 0; h < HASH_SIZE; h++) {
1070 struct ip_tunnel *t;
1071 while ((t = tunnels[prio][h]) != NULL)
1072 unregister_netdevice(t->dev);
1077 static int sit_init_net(struct net *net)
1080 struct sit_net *sitn;
1083 sitn = kmalloc(sizeof(struct sit_net), GFP_KERNEL);
1087 err = net_assign_generic(net, sit_net_id, sitn);
1099 static void sit_exit_net(struct net *net)
1101 struct sit_net *sitn;
1103 sitn = net_generic(net, sit_net_id);
1107 static struct pernet_operations sit_net_ops = {
1108 .init = sit_init_net,
1109 .exit = sit_exit_net,
1112 static void __exit sit_cleanup(void)
1114 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1117 sit_destroy_tunnels();
1118 unregister_netdevice(ipip6_fb_tunnel_dev);
1121 unregister_pernet_gen_device(sit_net_id, &sit_net_ops);
1124 static int __init sit_init(void)
1128 printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n");
1130 if (xfrm4_tunnel_register(&sit_handler, AF_INET6) < 0) {
1131 printk(KERN_INFO "sit init: Can't add protocol\n");
1135 ipip6_fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
1136 ipip6_tunnel_setup);
1137 if (!ipip6_fb_tunnel_dev) {
1142 ipip6_fb_tunnel_dev->init = ipip6_fb_tunnel_init;
1144 if ((err = register_netdev(ipip6_fb_tunnel_dev)))
1147 err = register_pernet_gen_device(&sit_net_id, &sit_net_ops);
1154 free_netdev(ipip6_fb_tunnel_dev);
1156 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1159 unregister_netdevice(ipip6_fb_tunnel_dev);
1163 module_init(sit_init);
1164 module_exit(sit_cleanup);
1165 MODULE_LICENSE("GPL");
1166 MODULE_ALIAS("sit0");