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 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
15 * Roger Venning <r.venning@telstra.com>: 6to4 support
16 * Nate Thompson <nate@thebog.net>: 6to4 support
17 * Fred Templin <fred.l.templin@boeing.com>: isatap support
20 #include <linux/module.h>
21 #include <linux/capability.h>
22 #include <linux/errno.h>
23 #include <linux/types.h>
24 #include <linux/socket.h>
25 #include <linux/sockios.h>
26 #include <linux/net.h>
27 #include <linux/in6.h>
28 #include <linux/netdevice.h>
29 #include <linux/if_arp.h>
30 #include <linux/icmp.h>
31 #include <linux/slab.h>
32 #include <asm/uaccess.h>
33 #include <linux/init.h>
34 #include <linux/netfilter_ipv4.h>
35 #include <linux/if_ether.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>
51 #include <net/inet_ecn.h>
53 #include <net/dsfield.h>
54 #include <net/net_namespace.h>
55 #include <net/netns/generic.h>
58 This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c
60 For comments look at net/ipv4/ip_gre.c --ANK
64 #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)
66 static int ipip6_tunnel_init(struct net_device
*dev
);
67 static void ipip6_tunnel_setup(struct net_device
*dev
);
68 static void ipip6_dev_free(struct net_device
*dev
);
70 static int sit_net_id __read_mostly
;
72 struct ip_tunnel __rcu
*tunnels_r_l
[HASH_SIZE
];
73 struct ip_tunnel __rcu
*tunnels_r
[HASH_SIZE
];
74 struct ip_tunnel __rcu
*tunnels_l
[HASH_SIZE
];
75 struct ip_tunnel __rcu
*tunnels_wc
[1];
76 struct ip_tunnel __rcu
**tunnels
[4];
78 struct net_device
*fb_tunnel_dev
;
82 * Locking : hash tables are protected by RCU and RTNL
85 #define for_each_ip_tunnel_rcu(start) \
86 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
88 /* often modified stats are per cpu, other are shared (netdev->stats) */
90 unsigned long rx_packets
;
91 unsigned long rx_bytes
;
92 unsigned long tx_packets
;
93 unsigned long tx_bytes
;
96 static struct net_device_stats
*ipip6_get_stats(struct net_device
*dev
)
98 struct pcpu_tstats sum
= { 0 };
101 for_each_possible_cpu(i
) {
102 const struct pcpu_tstats
*tstats
= per_cpu_ptr(dev
->tstats
, i
);
104 sum
.rx_packets
+= tstats
->rx_packets
;
105 sum
.rx_bytes
+= tstats
->rx_bytes
;
106 sum
.tx_packets
+= tstats
->tx_packets
;
107 sum
.tx_bytes
+= tstats
->tx_bytes
;
109 dev
->stats
.rx_packets
= sum
.rx_packets
;
110 dev
->stats
.rx_bytes
= sum
.rx_bytes
;
111 dev
->stats
.tx_packets
= sum
.tx_packets
;
112 dev
->stats
.tx_bytes
= sum
.tx_bytes
;
116 * Must be invoked with rcu_read_lock
118 static struct ip_tunnel
* ipip6_tunnel_lookup(struct net
*net
,
119 struct net_device
*dev
, __be32 remote
, __be32 local
)
121 unsigned int h0
= HASH(remote
);
122 unsigned int h1
= HASH(local
);
124 struct sit_net
*sitn
= net_generic(net
, sit_net_id
);
126 for_each_ip_tunnel_rcu(sitn
->tunnels_r_l
[h0
^ h1
]) {
127 if (local
== t
->parms
.iph
.saddr
&&
128 remote
== t
->parms
.iph
.daddr
&&
129 (!dev
|| !t
->parms
.link
|| dev
->iflink
== t
->parms
.link
) &&
130 (t
->dev
->flags
& IFF_UP
))
133 for_each_ip_tunnel_rcu(sitn
->tunnels_r
[h0
]) {
134 if (remote
== t
->parms
.iph
.daddr
&&
135 (!dev
|| !t
->parms
.link
|| dev
->iflink
== t
->parms
.link
) &&
136 (t
->dev
->flags
& IFF_UP
))
139 for_each_ip_tunnel_rcu(sitn
->tunnels_l
[h1
]) {
140 if (local
== t
->parms
.iph
.saddr
&&
141 (!dev
|| !t
->parms
.link
|| dev
->iflink
== t
->parms
.link
) &&
142 (t
->dev
->flags
& IFF_UP
))
145 t
= rcu_dereference(sitn
->tunnels_wc
[0]);
146 if ((t
!= NULL
) && (t
->dev
->flags
& IFF_UP
))
151 static struct ip_tunnel __rcu
**__ipip6_bucket(struct sit_net
*sitn
,
152 struct ip_tunnel_parm
*parms
)
154 __be32 remote
= parms
->iph
.daddr
;
155 __be32 local
= parms
->iph
.saddr
;
167 return &sitn
->tunnels
[prio
][h
];
170 static inline struct ip_tunnel __rcu
**ipip6_bucket(struct sit_net
*sitn
,
173 return __ipip6_bucket(sitn
, &t
->parms
);
176 static void ipip6_tunnel_unlink(struct sit_net
*sitn
, struct ip_tunnel
*t
)
178 struct ip_tunnel __rcu
**tp
;
179 struct ip_tunnel
*iter
;
181 for (tp
= ipip6_bucket(sitn
, t
);
182 (iter
= rtnl_dereference(*tp
)) != NULL
;
185 rcu_assign_pointer(*tp
, t
->next
);
191 static void ipip6_tunnel_link(struct sit_net
*sitn
, struct ip_tunnel
*t
)
193 struct ip_tunnel __rcu
**tp
= ipip6_bucket(sitn
, t
);
195 rcu_assign_pointer(t
->next
, rtnl_dereference(*tp
));
196 rcu_assign_pointer(*tp
, t
);
199 static void ipip6_tunnel_clone_6rd(struct net_device
*dev
, struct sit_net
*sitn
)
201 #ifdef CONFIG_IPV6_SIT_6RD
202 struct ip_tunnel
*t
= netdev_priv(dev
);
204 if (t
->dev
== sitn
->fb_tunnel_dev
) {
205 ipv6_addr_set(&t
->ip6rd
.prefix
, htonl(0x20020000), 0, 0, 0);
206 t
->ip6rd
.relay_prefix
= 0;
207 t
->ip6rd
.prefixlen
= 16;
208 t
->ip6rd
.relay_prefixlen
= 0;
210 struct ip_tunnel
*t0
= netdev_priv(sitn
->fb_tunnel_dev
);
211 memcpy(&t
->ip6rd
, &t0
->ip6rd
, sizeof(t
->ip6rd
));
216 static struct ip_tunnel
*ipip6_tunnel_locate(struct net
*net
,
217 struct ip_tunnel_parm
*parms
, int create
)
219 __be32 remote
= parms
->iph
.daddr
;
220 __be32 local
= parms
->iph
.saddr
;
221 struct ip_tunnel
*t
, *nt
;
222 struct ip_tunnel __rcu
**tp
;
223 struct net_device
*dev
;
225 struct sit_net
*sitn
= net_generic(net
, sit_net_id
);
227 for (tp
= __ipip6_bucket(sitn
, parms
);
228 (t
= rtnl_dereference(*tp
)) != NULL
;
230 if (local
== t
->parms
.iph
.saddr
&&
231 remote
== t
->parms
.iph
.daddr
&&
232 parms
->link
== t
->parms
.link
) {
243 strlcpy(name
, parms
->name
, IFNAMSIZ
);
245 strcpy(name
, "sit%d");
247 dev
= alloc_netdev(sizeof(*t
), name
, ipip6_tunnel_setup
);
251 dev_net_set(dev
, net
);
253 if (strchr(name
, '%')) {
254 if (dev_alloc_name(dev
, name
) < 0)
258 nt
= netdev_priv(dev
);
261 if (ipip6_tunnel_init(dev
) < 0)
263 ipip6_tunnel_clone_6rd(dev
, sitn
);
265 if (parms
->i_flags
& SIT_ISATAP
)
266 dev
->priv_flags
|= IFF_ISATAP
;
268 if (register_netdevice(dev
) < 0)
273 ipip6_tunnel_link(sitn
, nt
);
282 #define for_each_prl_rcu(start) \
283 for (prl = rcu_dereference(start); \
285 prl = rcu_dereference(prl->next))
287 static struct ip_tunnel_prl_entry
*
288 __ipip6_tunnel_locate_prl(struct ip_tunnel
*t
, __be32 addr
)
290 struct ip_tunnel_prl_entry
*prl
;
292 for_each_prl_rcu(t
->prl
)
293 if (prl
->addr
== addr
)
299 static int ipip6_tunnel_get_prl(struct ip_tunnel
*t
,
300 struct ip_tunnel_prl __user
*a
)
302 struct ip_tunnel_prl kprl
, *kp
;
303 struct ip_tunnel_prl_entry
*prl
;
304 unsigned int cmax
, c
= 0, ca
, len
;
307 if (copy_from_user(&kprl
, a
, sizeof(kprl
)))
309 cmax
= kprl
.datalen
/ sizeof(kprl
);
310 if (cmax
> 1 && kprl
.addr
!= htonl(INADDR_ANY
))
313 /* For simple GET or for root users,
314 * we try harder to allocate.
316 kp
= (cmax
<= 1 || capable(CAP_NET_ADMIN
)) ?
317 kcalloc(cmax
, sizeof(*kp
), GFP_KERNEL
) :
322 ca
= t
->prl_count
< cmax
? t
->prl_count
: cmax
;
325 /* We don't try hard to allocate much memory for
327 * For root users, retry allocating enough memory for
330 kp
= kcalloc(ca
, sizeof(*kp
), GFP_ATOMIC
);
338 for_each_prl_rcu(t
->prl
) {
341 if (kprl
.addr
!= htonl(INADDR_ANY
) && prl
->addr
!= kprl
.addr
)
343 kp
[c
].addr
= prl
->addr
;
344 kp
[c
].flags
= prl
->flags
;
346 if (kprl
.addr
!= htonl(INADDR_ANY
))
352 len
= sizeof(*kp
) * c
;
354 if ((len
&& copy_to_user(a
+ 1, kp
, len
)) || put_user(len
, &a
->datalen
))
363 ipip6_tunnel_add_prl(struct ip_tunnel
*t
, struct ip_tunnel_prl
*a
, int chg
)
365 struct ip_tunnel_prl_entry
*p
;
368 if (a
->addr
== htonl(INADDR_ANY
))
373 for (p
= rtnl_dereference(t
->prl
); p
; p
= rtnl_dereference(p
->next
)) {
374 if (p
->addr
== a
->addr
) {
389 p
= kzalloc(sizeof(struct ip_tunnel_prl_entry
), GFP_KERNEL
);
399 rcu_assign_pointer(t
->prl
, p
);
404 static void prl_list_destroy_rcu(struct rcu_head
*head
)
406 struct ip_tunnel_prl_entry
*p
, *n
;
408 p
= container_of(head
, struct ip_tunnel_prl_entry
, rcu_head
);
410 n
= rcu_dereference_protected(p
->next
, 1);
417 ipip6_tunnel_del_prl(struct ip_tunnel
*t
, struct ip_tunnel_prl
*a
)
419 struct ip_tunnel_prl_entry
*x
;
420 struct ip_tunnel_prl_entry __rcu
**p
;
425 if (a
&& a
->addr
!= htonl(INADDR_ANY
)) {
427 (x
= rtnl_dereference(*p
)) != NULL
;
429 if (x
->addr
== a
->addr
) {
431 kfree_rcu(x
, rcu_head
);
438 x
= rtnl_dereference(t
->prl
);
441 call_rcu(&x
->rcu_head
, prl_list_destroy_rcu
);
450 isatap_chksrc(struct sk_buff
*skb
, const struct iphdr
*iph
, struct ip_tunnel
*t
)
452 struct ip_tunnel_prl_entry
*p
;
456 p
= __ipip6_tunnel_locate_prl(t
, iph
->saddr
);
458 if (p
->flags
& PRL_DEFAULT
)
459 skb
->ndisc_nodetype
= NDISC_NODETYPE_DEFAULT
;
461 skb
->ndisc_nodetype
= NDISC_NODETYPE_NODEFAULT
;
463 const struct in6_addr
*addr6
= &ipv6_hdr(skb
)->saddr
;
465 if (ipv6_addr_is_isatap(addr6
) &&
466 (addr6
->s6_addr32
[3] == iph
->saddr
) &&
467 ipv6_chk_prefix(addr6
, t
->dev
))
468 skb
->ndisc_nodetype
= NDISC_NODETYPE_HOST
;
476 static void ipip6_tunnel_uninit(struct net_device
*dev
)
478 struct net
*net
= dev_net(dev
);
479 struct sit_net
*sitn
= net_generic(net
, sit_net_id
);
481 if (dev
== sitn
->fb_tunnel_dev
) {
482 rcu_assign_pointer(sitn
->tunnels_wc
[0], NULL
);
484 ipip6_tunnel_unlink(sitn
, netdev_priv(dev
));
485 ipip6_tunnel_del_prl(netdev_priv(dev
), NULL
);
491 static int ipip6_err(struct sk_buff
*skb
, u32 info
)
494 /* All the routers (except for Linux) return only
495 8 bytes of packet payload. It means, that precise relaying of
496 ICMP in the real Internet is absolutely infeasible.
498 const struct iphdr
*iph
= (const struct iphdr
*)skb
->data
;
499 const int type
= icmp_hdr(skb
)->type
;
500 const int code
= icmp_hdr(skb
)->code
;
506 case ICMP_PARAMETERPROB
:
509 case ICMP_DEST_UNREACH
:
512 case ICMP_PORT_UNREACH
:
513 /* Impossible event. */
515 case ICMP_FRAG_NEEDED
:
516 /* Soft state for pmtu is maintained by IP core. */
519 /* All others are translated to HOST_UNREACH.
520 rfc2003 contains "deep thoughts" about NET_UNREACH,
521 I believe they are just ether pollution. --ANK
526 case ICMP_TIME_EXCEEDED
:
527 if (code
!= ICMP_EXC_TTL
)
535 t
= ipip6_tunnel_lookup(dev_net(skb
->dev
),
539 if (t
== NULL
|| t
->parms
.iph
.daddr
== 0)
543 if (t
->parms
.iph
.ttl
== 0 && type
== ICMP_TIME_EXCEEDED
)
546 if (time_before(jiffies
, t
->err_time
+ IPTUNNEL_ERR_TIMEO
))
550 t
->err_time
= jiffies
;
556 static inline void ipip6_ecn_decapsulate(const struct iphdr
*iph
, struct sk_buff
*skb
)
558 if (INET_ECN_is_ce(iph
->tos
))
559 IP6_ECN_set_ce(ipv6_hdr(skb
));
562 static int ipip6_rcv(struct sk_buff
*skb
)
564 const struct iphdr
*iph
;
565 struct ip_tunnel
*tunnel
;
567 if (!pskb_may_pull(skb
, sizeof(struct ipv6hdr
)))
573 tunnel
= ipip6_tunnel_lookup(dev_net(skb
->dev
), skb
->dev
,
574 iph
->saddr
, iph
->daddr
);
575 if (tunnel
!= NULL
) {
576 struct pcpu_tstats
*tstats
;
579 skb
->mac_header
= skb
->network_header
;
580 skb_reset_network_header(skb
);
581 IPCB(skb
)->flags
= 0;
582 skb
->protocol
= htons(ETH_P_IPV6
);
583 skb
->pkt_type
= PACKET_HOST
;
585 if ((tunnel
->dev
->priv_flags
& IFF_ISATAP
) &&
586 !isatap_chksrc(skb
, iph
, tunnel
)) {
587 tunnel
->dev
->stats
.rx_errors
++;
593 tstats
= this_cpu_ptr(tunnel
->dev
->tstats
);
594 tstats
->rx_packets
++;
595 tstats
->rx_bytes
+= skb
->len
;
597 __skb_tunnel_rx(skb
, tunnel
->dev
);
599 ipip6_ecn_decapsulate(iph
, skb
);
607 /* no tunnel matched, let upstream know, ipsec may handle it */
616 * Returns the embedded IPv4 address if the IPv6 address
617 * comes from 6rd / 6to4 (RFC 3056) addr space.
620 __be32
try_6rd(const struct in6_addr
*v6dst
, struct ip_tunnel
*tunnel
)
624 #ifdef CONFIG_IPV6_SIT_6RD
625 if (ipv6_prefix_equal(v6dst
, &tunnel
->ip6rd
.prefix
,
626 tunnel
->ip6rd
.prefixlen
)) {
627 unsigned int pbw0
, pbi0
;
631 pbw0
= tunnel
->ip6rd
.prefixlen
>> 5;
632 pbi0
= tunnel
->ip6rd
.prefixlen
& 0x1f;
634 d
= (ntohl(v6dst
->s6_addr32
[pbw0
]) << pbi0
) >>
635 tunnel
->ip6rd
.relay_prefixlen
;
637 pbi1
= pbi0
- tunnel
->ip6rd
.relay_prefixlen
;
639 d
|= ntohl(v6dst
->s6_addr32
[pbw0
+ 1]) >>
642 dst
= tunnel
->ip6rd
.relay_prefix
| htonl(d
);
645 if (v6dst
->s6_addr16
[0] == htons(0x2002)) {
646 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
647 memcpy(&dst
, &v6dst
->s6_addr16
[1], 4);
654 * This function assumes it is being called from dev_queue_xmit()
655 * and that skb is filled properly by that function.
658 static netdev_tx_t
ipip6_tunnel_xmit(struct sk_buff
*skb
,
659 struct net_device
*dev
)
661 struct ip_tunnel
*tunnel
= netdev_priv(dev
);
662 struct pcpu_tstats
*tstats
;
663 const struct iphdr
*tiph
= &tunnel
->parms
.iph
;
664 const struct ipv6hdr
*iph6
= ipv6_hdr(skb
);
665 u8 tos
= tunnel
->parms
.iph
.tos
;
666 __be16 df
= tiph
->frag_off
;
667 struct rtable
*rt
; /* Route to the other host */
668 struct net_device
*tdev
; /* Device to other host */
669 struct iphdr
*iph
; /* Our new IP header */
670 unsigned int max_headroom
; /* The extra header space needed */
671 __be32 dst
= tiph
->daddr
;
673 const struct in6_addr
*addr6
;
676 if (skb
->protocol
!= htons(ETH_P_IPV6
))
679 /* ISATAP (RFC4214) - must come before 6to4 */
680 if (dev
->priv_flags
& IFF_ISATAP
) {
681 struct neighbour
*neigh
= NULL
;
684 neigh
= skb_dst(skb
)->neighbour
;
688 printk(KERN_DEBUG
"sit: nexthop == NULL\n");
692 addr6
= (const struct in6_addr
*)&neigh
->primary_key
;
693 addr_type
= ipv6_addr_type(addr6
);
695 if ((addr_type
& IPV6_ADDR_UNICAST
) &&
696 ipv6_addr_is_isatap(addr6
))
697 dst
= addr6
->s6_addr32
[3];
703 dst
= try_6rd(&iph6
->daddr
, tunnel
);
706 struct neighbour
*neigh
= NULL
;
709 neigh
= skb_dst(skb
)->neighbour
;
713 printk(KERN_DEBUG
"sit: nexthop == NULL\n");
717 addr6
= (const struct in6_addr
*)&neigh
->primary_key
;
718 addr_type
= ipv6_addr_type(addr6
);
720 if (addr_type
== IPV6_ADDR_ANY
) {
721 addr6
= &ipv6_hdr(skb
)->daddr
;
722 addr_type
= ipv6_addr_type(addr6
);
725 if ((addr_type
& IPV6_ADDR_COMPATv4
) == 0)
728 dst
= addr6
->s6_addr32
[3];
731 rt
= ip_route_output_ports(dev_net(dev
), NULL
,
734 IPPROTO_IPV6
, RT_TOS(tos
),
737 dev
->stats
.tx_carrier_errors
++;
740 if (rt
->rt_type
!= RTN_UNICAST
) {
742 dev
->stats
.tx_carrier_errors
++;
749 dev
->stats
.collisions
++;
754 mtu
= dst_mtu(&rt
->dst
) - sizeof(struct iphdr
);
757 dev
->stats
.collisions
++;
762 if (mtu
< IPV6_MIN_MTU
) {
767 if (tunnel
->parms
.iph
.daddr
&& skb_dst(skb
))
768 skb_dst(skb
)->ops
->update_pmtu(skb_dst(skb
), mtu
);
770 if (skb
->len
> mtu
) {
771 icmpv6_send(skb
, ICMPV6_PKT_TOOBIG
, 0, mtu
);
777 if (tunnel
->err_count
> 0) {
778 if (time_before(jiffies
,
779 tunnel
->err_time
+ IPTUNNEL_ERR_TIMEO
)) {
781 dst_link_failure(skb
);
783 tunnel
->err_count
= 0;
787 * Okay, now see if we can stuff it in the buffer as-is.
789 max_headroom
= LL_RESERVED_SPACE(tdev
)+sizeof(struct iphdr
);
791 if (skb_headroom(skb
) < max_headroom
|| skb_shared(skb
) ||
792 (skb_cloned(skb
) && !skb_clone_writable(skb
, 0))) {
793 struct sk_buff
*new_skb
= skb_realloc_headroom(skb
, max_headroom
);
796 dev
->stats
.tx_dropped
++;
801 skb_set_owner_w(new_skb
, skb
->sk
);
804 iph6
= ipv6_hdr(skb
);
807 skb
->transport_header
= skb
->network_header
;
808 skb_push(skb
, sizeof(struct iphdr
));
809 skb_reset_network_header(skb
);
810 memset(&(IPCB(skb
)->opt
), 0, sizeof(IPCB(skb
)->opt
));
811 IPCB(skb
)->flags
= 0;
813 skb_dst_set(skb
, &rt
->dst
);
816 * Push down and install the IPIP header.
821 iph
->ihl
= sizeof(struct iphdr
)>>2;
823 iph
->protocol
= IPPROTO_IPV6
;
824 iph
->tos
= INET_ECN_encapsulate(tos
, ipv6_get_dsfield(iph6
));
825 iph
->daddr
= rt
->rt_dst
;
826 iph
->saddr
= rt
->rt_src
;
828 if ((iph
->ttl
= tiph
->ttl
) == 0)
829 iph
->ttl
= iph6
->hop_limit
;
832 tstats
= this_cpu_ptr(dev
->tstats
);
833 __IPTUNNEL_XMIT(tstats
, &dev
->stats
);
837 dst_link_failure(skb
);
839 dev
->stats
.tx_errors
++;
844 static void ipip6_tunnel_bind_dev(struct net_device
*dev
)
846 struct net_device
*tdev
= NULL
;
847 struct ip_tunnel
*tunnel
;
848 const struct iphdr
*iph
;
850 tunnel
= netdev_priv(dev
);
851 iph
= &tunnel
->parms
.iph
;
854 struct rtable
*rt
= ip_route_output_ports(dev_net(dev
), NULL
,
855 iph
->daddr
, iph
->saddr
,
865 dev
->flags
|= IFF_POINTOPOINT
;
868 if (!tdev
&& tunnel
->parms
.link
)
869 tdev
= __dev_get_by_index(dev_net(dev
), tunnel
->parms
.link
);
872 dev
->hard_header_len
= tdev
->hard_header_len
+ sizeof(struct iphdr
);
873 dev
->mtu
= tdev
->mtu
- sizeof(struct iphdr
);
874 if (dev
->mtu
< IPV6_MIN_MTU
)
875 dev
->mtu
= IPV6_MIN_MTU
;
877 dev
->iflink
= tunnel
->parms
.link
;
881 ipip6_tunnel_ioctl (struct net_device
*dev
, struct ifreq
*ifr
, int cmd
)
884 struct ip_tunnel_parm p
;
885 struct ip_tunnel_prl prl
;
887 struct net
*net
= dev_net(dev
);
888 struct sit_net
*sitn
= net_generic(net
, sit_net_id
);
889 #ifdef CONFIG_IPV6_SIT_6RD
890 struct ip_tunnel_6rd ip6rd
;
895 #ifdef CONFIG_IPV6_SIT_6RD
899 if (dev
== sitn
->fb_tunnel_dev
) {
900 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
))) {
904 t
= ipip6_tunnel_locate(net
, &p
, 0);
907 t
= netdev_priv(dev
);
910 if (cmd
== SIOCGETTUNNEL
) {
911 memcpy(&p
, &t
->parms
, sizeof(p
));
912 if (copy_to_user(ifr
->ifr_ifru
.ifru_data
, &p
,
915 #ifdef CONFIG_IPV6_SIT_6RD
917 ipv6_addr_copy(&ip6rd
.prefix
, &t
->ip6rd
.prefix
);
918 ip6rd
.relay_prefix
= t
->ip6rd
.relay_prefix
;
919 ip6rd
.prefixlen
= t
->ip6rd
.prefixlen
;
920 ip6rd
.relay_prefixlen
= t
->ip6rd
.relay_prefixlen
;
921 if (copy_to_user(ifr
->ifr_ifru
.ifru_data
, &ip6rd
,
932 if (!capable(CAP_NET_ADMIN
))
936 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
)))
940 if (p
.iph
.version
!= 4 || p
.iph
.protocol
!= IPPROTO_IPV6
||
941 p
.iph
.ihl
!= 5 || (p
.iph
.frag_off
&htons(~IP_DF
)))
944 p
.iph
.frag_off
|= htons(IP_DF
);
946 t
= ipip6_tunnel_locate(net
, &p
, cmd
== SIOCADDTUNNEL
);
948 if (dev
!= sitn
->fb_tunnel_dev
&& cmd
== SIOCCHGTUNNEL
) {
955 if (((dev
->flags
&IFF_POINTOPOINT
) && !p
.iph
.daddr
) ||
956 (!(dev
->flags
&IFF_POINTOPOINT
) && p
.iph
.daddr
)) {
960 t
= netdev_priv(dev
);
961 ipip6_tunnel_unlink(sitn
, t
);
963 t
->parms
.iph
.saddr
= p
.iph
.saddr
;
964 t
->parms
.iph
.daddr
= p
.iph
.daddr
;
965 memcpy(dev
->dev_addr
, &p
.iph
.saddr
, 4);
966 memcpy(dev
->broadcast
, &p
.iph
.daddr
, 4);
967 ipip6_tunnel_link(sitn
, t
);
968 netdev_state_change(dev
);
974 if (cmd
== SIOCCHGTUNNEL
) {
975 t
->parms
.iph
.ttl
= p
.iph
.ttl
;
976 t
->parms
.iph
.tos
= p
.iph
.tos
;
977 if (t
->parms
.link
!= p
.link
) {
978 t
->parms
.link
= p
.link
;
979 ipip6_tunnel_bind_dev(dev
);
980 netdev_state_change(dev
);
983 if (copy_to_user(ifr
->ifr_ifru
.ifru_data
, &t
->parms
, sizeof(p
)))
986 err
= (cmd
== SIOCADDTUNNEL
? -ENOBUFS
: -ENOENT
);
991 if (!capable(CAP_NET_ADMIN
))
994 if (dev
== sitn
->fb_tunnel_dev
) {
996 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
)))
999 if ((t
= ipip6_tunnel_locate(net
, &p
, 0)) == NULL
)
1002 if (t
== netdev_priv(sitn
->fb_tunnel_dev
))
1006 unregister_netdevice(dev
);
1012 if (dev
== sitn
->fb_tunnel_dev
)
1015 if (!(t
= netdev_priv(dev
)))
1017 err
= ipip6_tunnel_get_prl(t
, ifr
->ifr_ifru
.ifru_data
);
1024 if (!capable(CAP_NET_ADMIN
))
1027 if (dev
== sitn
->fb_tunnel_dev
)
1030 if (copy_from_user(&prl
, ifr
->ifr_ifru
.ifru_data
, sizeof(prl
)))
1033 if (!(t
= netdev_priv(dev
)))
1038 err
= ipip6_tunnel_del_prl(t
, &prl
);
1042 err
= ipip6_tunnel_add_prl(t
, &prl
, cmd
== SIOCCHGPRL
);
1045 netdev_state_change(dev
);
1048 #ifdef CONFIG_IPV6_SIT_6RD
1053 if (!capable(CAP_NET_ADMIN
))
1057 if (copy_from_user(&ip6rd
, ifr
->ifr_ifru
.ifru_data
,
1061 t
= netdev_priv(dev
);
1063 if (cmd
!= SIOCDEL6RD
) {
1064 struct in6_addr prefix
;
1065 __be32 relay_prefix
;
1068 if (ip6rd
.relay_prefixlen
> 32 ||
1069 ip6rd
.prefixlen
+ (32 - ip6rd
.relay_prefixlen
) > 64)
1072 ipv6_addr_prefix(&prefix
, &ip6rd
.prefix
,
1074 if (!ipv6_addr_equal(&prefix
, &ip6rd
.prefix
))
1076 if (ip6rd
.relay_prefixlen
)
1077 relay_prefix
= ip6rd
.relay_prefix
&
1078 htonl(0xffffffffUL
<<
1079 (32 - ip6rd
.relay_prefixlen
));
1082 if (relay_prefix
!= ip6rd
.relay_prefix
)
1085 ipv6_addr_copy(&t
->ip6rd
.prefix
, &prefix
);
1086 t
->ip6rd
.relay_prefix
= relay_prefix
;
1087 t
->ip6rd
.prefixlen
= ip6rd
.prefixlen
;
1088 t
->ip6rd
.relay_prefixlen
= ip6rd
.relay_prefixlen
;
1090 ipip6_tunnel_clone_6rd(dev
, sitn
);
1104 static int ipip6_tunnel_change_mtu(struct net_device
*dev
, int new_mtu
)
1106 if (new_mtu
< IPV6_MIN_MTU
|| new_mtu
> 0xFFF8 - sizeof(struct iphdr
))
1112 static const struct net_device_ops ipip6_netdev_ops
= {
1113 .ndo_uninit
= ipip6_tunnel_uninit
,
1114 .ndo_start_xmit
= ipip6_tunnel_xmit
,
1115 .ndo_do_ioctl
= ipip6_tunnel_ioctl
,
1116 .ndo_change_mtu
= ipip6_tunnel_change_mtu
,
1117 .ndo_get_stats
= ipip6_get_stats
,
1120 static void ipip6_dev_free(struct net_device
*dev
)
1122 free_percpu(dev
->tstats
);
1126 static void ipip6_tunnel_setup(struct net_device
*dev
)
1128 dev
->netdev_ops
= &ipip6_netdev_ops
;
1129 dev
->destructor
= ipip6_dev_free
;
1131 dev
->type
= ARPHRD_SIT
;
1132 dev
->hard_header_len
= LL_MAX_HEADER
+ sizeof(struct iphdr
);
1133 dev
->mtu
= ETH_DATA_LEN
- sizeof(struct iphdr
);
1134 dev
->flags
= IFF_NOARP
;
1135 dev
->priv_flags
&= ~IFF_XMIT_DST_RELEASE
;
1138 dev
->features
|= NETIF_F_NETNS_LOCAL
;
1139 dev
->features
|= NETIF_F_LLTX
;
1142 static int ipip6_tunnel_init(struct net_device
*dev
)
1144 struct ip_tunnel
*tunnel
= netdev_priv(dev
);
1147 strcpy(tunnel
->parms
.name
, dev
->name
);
1149 memcpy(dev
->dev_addr
, &tunnel
->parms
.iph
.saddr
, 4);
1150 memcpy(dev
->broadcast
, &tunnel
->parms
.iph
.daddr
, 4);
1152 ipip6_tunnel_bind_dev(dev
);
1153 dev
->tstats
= alloc_percpu(struct pcpu_tstats
);
1160 static int __net_init
ipip6_fb_tunnel_init(struct net_device
*dev
)
1162 struct ip_tunnel
*tunnel
= netdev_priv(dev
);
1163 struct iphdr
*iph
= &tunnel
->parms
.iph
;
1164 struct net
*net
= dev_net(dev
);
1165 struct sit_net
*sitn
= net_generic(net
, sit_net_id
);
1168 strcpy(tunnel
->parms
.name
, dev
->name
);
1171 iph
->protocol
= IPPROTO_IPV6
;
1175 dev
->tstats
= alloc_percpu(struct pcpu_tstats
);
1179 rcu_assign_pointer(sitn
->tunnels_wc
[0], tunnel
);
1183 static struct xfrm_tunnel sit_handler __read_mostly
= {
1184 .handler
= ipip6_rcv
,
1185 .err_handler
= ipip6_err
,
1189 static void __net_exit
sit_destroy_tunnels(struct sit_net
*sitn
, struct list_head
*head
)
1193 for (prio
= 1; prio
< 4; prio
++) {
1195 for (h
= 0; h
< HASH_SIZE
; h
++) {
1196 struct ip_tunnel
*t
;
1198 t
= rtnl_dereference(sitn
->tunnels
[prio
][h
]);
1200 unregister_netdevice_queue(t
->dev
, head
);
1201 t
= rtnl_dereference(t
->next
);
1207 static int __net_init
sit_init_net(struct net
*net
)
1209 struct sit_net
*sitn
= net_generic(net
, sit_net_id
);
1212 sitn
->tunnels
[0] = sitn
->tunnels_wc
;
1213 sitn
->tunnels
[1] = sitn
->tunnels_l
;
1214 sitn
->tunnels
[2] = sitn
->tunnels_r
;
1215 sitn
->tunnels
[3] = sitn
->tunnels_r_l
;
1217 sitn
->fb_tunnel_dev
= alloc_netdev(sizeof(struct ip_tunnel
), "sit0",
1218 ipip6_tunnel_setup
);
1219 if (!sitn
->fb_tunnel_dev
) {
1223 dev_net_set(sitn
->fb_tunnel_dev
, net
);
1225 err
= ipip6_fb_tunnel_init(sitn
->fb_tunnel_dev
);
1229 ipip6_tunnel_clone_6rd(sitn
->fb_tunnel_dev
, sitn
);
1231 if ((err
= register_netdev(sitn
->fb_tunnel_dev
)))
1237 dev_put(sitn
->fb_tunnel_dev
);
1239 ipip6_dev_free(sitn
->fb_tunnel_dev
);
1244 static void __net_exit
sit_exit_net(struct net
*net
)
1246 struct sit_net
*sitn
= net_generic(net
, sit_net_id
);
1250 sit_destroy_tunnels(sitn
, &list
);
1251 unregister_netdevice_queue(sitn
->fb_tunnel_dev
, &list
);
1252 unregister_netdevice_many(&list
);
1256 static struct pernet_operations sit_net_ops
= {
1257 .init
= sit_init_net
,
1258 .exit
= sit_exit_net
,
1260 .size
= sizeof(struct sit_net
),
1263 static void __exit
sit_cleanup(void)
1265 xfrm4_tunnel_deregister(&sit_handler
, AF_INET6
);
1267 unregister_pernet_device(&sit_net_ops
);
1268 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1271 static int __init
sit_init(void)
1275 printk(KERN_INFO
"IPv6 over IPv4 tunneling driver\n");
1277 err
= register_pernet_device(&sit_net_ops
);
1280 err
= xfrm4_tunnel_register(&sit_handler
, AF_INET6
);
1282 unregister_pernet_device(&sit_net_ops
);
1283 printk(KERN_INFO
"sit init: Can't add protocol\n");
1288 module_init(sit_init
);
1289 module_exit(sit_cleanup
);
1290 MODULE_LICENSE("GPL");
1291 MODULE_ALIAS_NETDEV("sit0");