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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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 <linux/slab.h>
34 #include <asm/uaccess.h>
35 #include <linux/init.h>
36 #include <linux/netfilter_ipv4.h>
37 #include <linux/if_ether.h>
43 #include <net/protocol.h>
44 #include <net/transp_v6.h>
45 #include <net/ip6_fib.h>
46 #include <net/ip6_route.h>
47 #include <net/ndisc.h>
48 #include <net/addrconf.h>
53 #include <net/inet_ecn.h>
55 #include <net/dsfield.h>
56 #include <net/net_namespace.h>
57 #include <net/netns/generic.h>
60 This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c
62 For comments look at net/ipv4/ip_gre.c --ANK
66 #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)
68 static int ipip6_tunnel_init(struct net_device
*dev
);
69 static void ipip6_tunnel_setup(struct net_device
*dev
);
70 static void ipip6_dev_free(struct net_device
*dev
);
72 static int sit_net_id __read_mostly
;
74 struct ip_tunnel __rcu
*tunnels_r_l
[HASH_SIZE
];
75 struct ip_tunnel __rcu
*tunnels_r
[HASH_SIZE
];
76 struct ip_tunnel __rcu
*tunnels_l
[HASH_SIZE
];
77 struct ip_tunnel __rcu
*tunnels_wc
[1];
78 struct ip_tunnel __rcu
**tunnels
[4];
80 struct net_device
*fb_tunnel_dev
;
84 * Locking : hash tables are protected by RCU and RTNL
87 #define for_each_ip_tunnel_rcu(start) \
88 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
90 /* often modified stats are per cpu, other are shared (netdev->stats) */
96 struct u64_stats_sync syncp
;
99 static struct rtnl_link_stats64
*ipip6_get_stats64(struct net_device
*dev
,
100 struct rtnl_link_stats64
*tot
)
104 for_each_possible_cpu(i
) {
105 const struct pcpu_tstats
*tstats
= per_cpu_ptr(dev
->tstats
, i
);
106 u64 rx_packets
, rx_bytes
, tx_packets
, tx_bytes
;
110 start
= u64_stats_fetch_begin_bh(&tstats
->syncp
);
111 rx_packets
= tstats
->rx_packets
;
112 tx_packets
= tstats
->tx_packets
;
113 rx_bytes
= tstats
->rx_bytes
;
114 tx_bytes
= tstats
->tx_bytes
;
115 } while (u64_stats_fetch_retry_bh(&tstats
->syncp
, start
));
117 tot
->rx_packets
+= rx_packets
;
118 tot
->tx_packets
+= tx_packets
;
119 tot
->rx_bytes
+= rx_bytes
;
120 tot
->tx_bytes
+= tx_bytes
;
123 tot
->rx_errors
= dev
->stats
.rx_errors
;
124 tot
->tx_fifo_errors
= dev
->stats
.tx_fifo_errors
;
125 tot
->tx_carrier_errors
= dev
->stats
.tx_carrier_errors
;
126 tot
->tx_dropped
= dev
->stats
.tx_dropped
;
127 tot
->tx_aborted_errors
= dev
->stats
.tx_aborted_errors
;
128 tot
->tx_errors
= dev
->stats
.tx_errors
;
134 * Must be invoked with rcu_read_lock
136 static struct ip_tunnel
*ipip6_tunnel_lookup(struct net
*net
,
137 struct net_device
*dev
, __be32 remote
, __be32 local
)
139 unsigned int h0
= HASH(remote
);
140 unsigned int h1
= HASH(local
);
142 struct sit_net
*sitn
= net_generic(net
, sit_net_id
);
144 for_each_ip_tunnel_rcu(sitn
->tunnels_r_l
[h0
^ h1
]) {
145 if (local
== t
->parms
.iph
.saddr
&&
146 remote
== t
->parms
.iph
.daddr
&&
147 (!dev
|| !t
->parms
.link
|| dev
->iflink
== t
->parms
.link
) &&
148 (t
->dev
->flags
& IFF_UP
))
151 for_each_ip_tunnel_rcu(sitn
->tunnels_r
[h0
]) {
152 if (remote
== t
->parms
.iph
.daddr
&&
153 (!dev
|| !t
->parms
.link
|| dev
->iflink
== t
->parms
.link
) &&
154 (t
->dev
->flags
& IFF_UP
))
157 for_each_ip_tunnel_rcu(sitn
->tunnels_l
[h1
]) {
158 if (local
== t
->parms
.iph
.saddr
&&
159 (!dev
|| !t
->parms
.link
|| dev
->iflink
== t
->parms
.link
) &&
160 (t
->dev
->flags
& IFF_UP
))
163 t
= rcu_dereference(sitn
->tunnels_wc
[0]);
164 if ((t
!= NULL
) && (t
->dev
->flags
& IFF_UP
))
169 static struct ip_tunnel __rcu
**__ipip6_bucket(struct sit_net
*sitn
,
170 struct ip_tunnel_parm
*parms
)
172 __be32 remote
= parms
->iph
.daddr
;
173 __be32 local
= parms
->iph
.saddr
;
185 return &sitn
->tunnels
[prio
][h
];
188 static inline struct ip_tunnel __rcu
**ipip6_bucket(struct sit_net
*sitn
,
191 return __ipip6_bucket(sitn
, &t
->parms
);
194 static void ipip6_tunnel_unlink(struct sit_net
*sitn
, struct ip_tunnel
*t
)
196 struct ip_tunnel __rcu
**tp
;
197 struct ip_tunnel
*iter
;
199 for (tp
= ipip6_bucket(sitn
, t
);
200 (iter
= rtnl_dereference(*tp
)) != NULL
;
203 rcu_assign_pointer(*tp
, t
->next
);
209 static void ipip6_tunnel_link(struct sit_net
*sitn
, struct ip_tunnel
*t
)
211 struct ip_tunnel __rcu
**tp
= ipip6_bucket(sitn
, t
);
213 rcu_assign_pointer(t
->next
, rtnl_dereference(*tp
));
214 rcu_assign_pointer(*tp
, t
);
217 static void ipip6_tunnel_clone_6rd(struct net_device
*dev
, struct sit_net
*sitn
)
219 #ifdef CONFIG_IPV6_SIT_6RD
220 struct ip_tunnel
*t
= netdev_priv(dev
);
222 if (t
->dev
== sitn
->fb_tunnel_dev
) {
223 ipv6_addr_set(&t
->ip6rd
.prefix
, htonl(0x20020000), 0, 0, 0);
224 t
->ip6rd
.relay_prefix
= 0;
225 t
->ip6rd
.prefixlen
= 16;
226 t
->ip6rd
.relay_prefixlen
= 0;
228 struct ip_tunnel
*t0
= netdev_priv(sitn
->fb_tunnel_dev
);
229 memcpy(&t
->ip6rd
, &t0
->ip6rd
, sizeof(t
->ip6rd
));
234 static struct ip_tunnel
*ipip6_tunnel_locate(struct net
*net
,
235 struct ip_tunnel_parm
*parms
, int create
)
237 __be32 remote
= parms
->iph
.daddr
;
238 __be32 local
= parms
->iph
.saddr
;
239 struct ip_tunnel
*t
, *nt
;
240 struct ip_tunnel __rcu
**tp
;
241 struct net_device
*dev
;
243 struct sit_net
*sitn
= net_generic(net
, sit_net_id
);
245 for (tp
= __ipip6_bucket(sitn
, parms
);
246 (t
= rtnl_dereference(*tp
)) != NULL
;
248 if (local
== t
->parms
.iph
.saddr
&&
249 remote
== t
->parms
.iph
.daddr
&&
250 parms
->link
== t
->parms
.link
) {
261 strlcpy(name
, parms
->name
, IFNAMSIZ
);
263 strcpy(name
, "sit%d");
265 dev
= alloc_netdev(sizeof(*t
), name
, ipip6_tunnel_setup
);
269 dev_net_set(dev
, net
);
271 nt
= netdev_priv(dev
);
274 if (ipip6_tunnel_init(dev
) < 0)
276 ipip6_tunnel_clone_6rd(dev
, sitn
);
278 if (parms
->i_flags
& SIT_ISATAP
)
279 dev
->priv_flags
|= IFF_ISATAP
;
281 if (register_netdevice(dev
) < 0)
284 strcpy(nt
->parms
.name
, dev
->name
);
288 ipip6_tunnel_link(sitn
, nt
);
297 #define for_each_prl_rcu(start) \
298 for (prl = rcu_dereference(start); \
300 prl = rcu_dereference(prl->next))
302 static struct ip_tunnel_prl_entry
*
303 __ipip6_tunnel_locate_prl(struct ip_tunnel
*t
, __be32 addr
)
305 struct ip_tunnel_prl_entry
*prl
;
307 for_each_prl_rcu(t
->prl
)
308 if (prl
->addr
== addr
)
314 static int ipip6_tunnel_get_prl(struct ip_tunnel
*t
,
315 struct ip_tunnel_prl __user
*a
)
317 struct ip_tunnel_prl kprl
, *kp
;
318 struct ip_tunnel_prl_entry
*prl
;
319 unsigned int cmax
, c
= 0, ca
, len
;
322 if (copy_from_user(&kprl
, a
, sizeof(kprl
)))
324 cmax
= kprl
.datalen
/ sizeof(kprl
);
325 if (cmax
> 1 && kprl
.addr
!= htonl(INADDR_ANY
))
328 /* For simple GET or for root users,
329 * we try harder to allocate.
331 kp
= (cmax
<= 1 || capable(CAP_NET_ADMIN
)) ?
332 kcalloc(cmax
, sizeof(*kp
), GFP_KERNEL
) :
337 ca
= t
->prl_count
< cmax
? t
->prl_count
: cmax
;
340 /* We don't try hard to allocate much memory for
342 * For root users, retry allocating enough memory for
345 kp
= kcalloc(ca
, sizeof(*kp
), GFP_ATOMIC
);
353 for_each_prl_rcu(t
->prl
) {
356 if (kprl
.addr
!= htonl(INADDR_ANY
) && prl
->addr
!= kprl
.addr
)
358 kp
[c
].addr
= prl
->addr
;
359 kp
[c
].flags
= prl
->flags
;
361 if (kprl
.addr
!= htonl(INADDR_ANY
))
367 len
= sizeof(*kp
) * c
;
369 if ((len
&& copy_to_user(a
+ 1, kp
, len
)) || put_user(len
, &a
->datalen
))
378 ipip6_tunnel_add_prl(struct ip_tunnel
*t
, struct ip_tunnel_prl
*a
, int chg
)
380 struct ip_tunnel_prl_entry
*p
;
383 if (a
->addr
== htonl(INADDR_ANY
))
388 for (p
= rtnl_dereference(t
->prl
); p
; p
= rtnl_dereference(p
->next
)) {
389 if (p
->addr
== a
->addr
) {
404 p
= kzalloc(sizeof(struct ip_tunnel_prl_entry
), GFP_KERNEL
);
414 rcu_assign_pointer(t
->prl
, p
);
419 static void prl_list_destroy_rcu(struct rcu_head
*head
)
421 struct ip_tunnel_prl_entry
*p
, *n
;
423 p
= container_of(head
, struct ip_tunnel_prl_entry
, rcu_head
);
425 n
= rcu_dereference_protected(p
->next
, 1);
432 ipip6_tunnel_del_prl(struct ip_tunnel
*t
, struct ip_tunnel_prl
*a
)
434 struct ip_tunnel_prl_entry
*x
;
435 struct ip_tunnel_prl_entry __rcu
**p
;
440 if (a
&& a
->addr
!= htonl(INADDR_ANY
)) {
442 (x
= rtnl_dereference(*p
)) != NULL
;
444 if (x
->addr
== a
->addr
) {
446 kfree_rcu(x
, rcu_head
);
453 x
= rtnl_dereference(t
->prl
);
456 call_rcu(&x
->rcu_head
, prl_list_destroy_rcu
);
465 isatap_chksrc(struct sk_buff
*skb
, const struct iphdr
*iph
, struct ip_tunnel
*t
)
467 struct ip_tunnel_prl_entry
*p
;
471 p
= __ipip6_tunnel_locate_prl(t
, iph
->saddr
);
473 if (p
->flags
& PRL_DEFAULT
)
474 skb
->ndisc_nodetype
= NDISC_NODETYPE_DEFAULT
;
476 skb
->ndisc_nodetype
= NDISC_NODETYPE_NODEFAULT
;
478 const struct in6_addr
*addr6
= &ipv6_hdr(skb
)->saddr
;
480 if (ipv6_addr_is_isatap(addr6
) &&
481 (addr6
->s6_addr32
[3] == iph
->saddr
) &&
482 ipv6_chk_prefix(addr6
, t
->dev
))
483 skb
->ndisc_nodetype
= NDISC_NODETYPE_HOST
;
491 static void ipip6_tunnel_uninit(struct net_device
*dev
)
493 struct net
*net
= dev_net(dev
);
494 struct sit_net
*sitn
= net_generic(net
, sit_net_id
);
496 if (dev
== sitn
->fb_tunnel_dev
) {
497 RCU_INIT_POINTER(sitn
->tunnels_wc
[0], NULL
);
499 ipip6_tunnel_unlink(sitn
, netdev_priv(dev
));
500 ipip6_tunnel_del_prl(netdev_priv(dev
), NULL
);
506 static int ipip6_err(struct sk_buff
*skb
, u32 info
)
509 /* All the routers (except for Linux) return only
510 8 bytes of packet payload. It means, that precise relaying of
511 ICMP in the real Internet is absolutely infeasible.
513 const struct iphdr
*iph
= (const struct iphdr
*)skb
->data
;
514 const int type
= icmp_hdr(skb
)->type
;
515 const int code
= icmp_hdr(skb
)->code
;
521 case ICMP_PARAMETERPROB
:
524 case ICMP_DEST_UNREACH
:
527 case ICMP_PORT_UNREACH
:
528 /* Impossible event. */
531 /* All others are translated to HOST_UNREACH.
532 rfc2003 contains "deep thoughts" about NET_UNREACH,
533 I believe they are just ether pollution. --ANK
538 case ICMP_TIME_EXCEEDED
:
539 if (code
!= ICMP_EXC_TTL
)
548 t
= ipip6_tunnel_lookup(dev_net(skb
->dev
),
555 if (type
== ICMP_DEST_UNREACH
&& code
== ICMP_FRAG_NEEDED
) {
556 ipv4_update_pmtu(skb
, dev_net(skb
->dev
), info
,
557 t
->dev
->ifindex
, 0, IPPROTO_IPV6
, 0);
561 if (type
== ICMP_REDIRECT
) {
562 ipv4_redirect(skb
, dev_net(skb
->dev
), t
->dev
->ifindex
, 0,
568 if (t
->parms
.iph
.daddr
== 0)
572 if (t
->parms
.iph
.ttl
== 0 && type
== ICMP_TIME_EXCEEDED
)
575 if (time_before(jiffies
, t
->err_time
+ IPTUNNEL_ERR_TIMEO
))
579 t
->err_time
= jiffies
;
584 static inline void ipip6_ecn_decapsulate(const struct iphdr
*iph
, struct sk_buff
*skb
)
586 if (INET_ECN_is_ce(iph
->tos
))
587 IP6_ECN_set_ce(ipv6_hdr(skb
));
590 static int ipip6_rcv(struct sk_buff
*skb
)
592 const struct iphdr
*iph
;
593 struct ip_tunnel
*tunnel
;
595 if (!pskb_may_pull(skb
, sizeof(struct ipv6hdr
)))
600 tunnel
= ipip6_tunnel_lookup(dev_net(skb
->dev
), skb
->dev
,
601 iph
->saddr
, iph
->daddr
);
602 if (tunnel
!= NULL
) {
603 struct pcpu_tstats
*tstats
;
606 skb
->mac_header
= skb
->network_header
;
607 skb_reset_network_header(skb
);
608 IPCB(skb
)->flags
= 0;
609 skb
->protocol
= htons(ETH_P_IPV6
);
610 skb
->pkt_type
= PACKET_HOST
;
612 if ((tunnel
->dev
->priv_flags
& IFF_ISATAP
) &&
613 !isatap_chksrc(skb
, iph
, tunnel
)) {
614 tunnel
->dev
->stats
.rx_errors
++;
619 tstats
= this_cpu_ptr(tunnel
->dev
->tstats
);
620 tstats
->rx_packets
++;
621 tstats
->rx_bytes
+= skb
->len
;
623 __skb_tunnel_rx(skb
, tunnel
->dev
);
625 ipip6_ecn_decapsulate(iph
, skb
);
632 /* no tunnel matched, let upstream know, ipsec may handle it */
640 * Returns the embedded IPv4 address if the IPv6 address
641 * comes from 6rd / 6to4 (RFC 3056) addr space.
644 __be32
try_6rd(const struct in6_addr
*v6dst
, struct ip_tunnel
*tunnel
)
648 #ifdef CONFIG_IPV6_SIT_6RD
649 if (ipv6_prefix_equal(v6dst
, &tunnel
->ip6rd
.prefix
,
650 tunnel
->ip6rd
.prefixlen
)) {
651 unsigned int pbw0
, pbi0
;
655 pbw0
= tunnel
->ip6rd
.prefixlen
>> 5;
656 pbi0
= tunnel
->ip6rd
.prefixlen
& 0x1f;
658 d
= (ntohl(v6dst
->s6_addr32
[pbw0
]) << pbi0
) >>
659 tunnel
->ip6rd
.relay_prefixlen
;
661 pbi1
= pbi0
- tunnel
->ip6rd
.relay_prefixlen
;
663 d
|= ntohl(v6dst
->s6_addr32
[pbw0
+ 1]) >>
666 dst
= tunnel
->ip6rd
.relay_prefix
| htonl(d
);
669 if (v6dst
->s6_addr16
[0] == htons(0x2002)) {
670 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
671 memcpy(&dst
, &v6dst
->s6_addr16
[1], 4);
678 * This function assumes it is being called from dev_queue_xmit()
679 * and that skb is filled properly by that function.
682 static netdev_tx_t
ipip6_tunnel_xmit(struct sk_buff
*skb
,
683 struct net_device
*dev
)
685 struct ip_tunnel
*tunnel
= netdev_priv(dev
);
686 struct pcpu_tstats
*tstats
;
687 const struct iphdr
*tiph
= &tunnel
->parms
.iph
;
688 const struct ipv6hdr
*iph6
= ipv6_hdr(skb
);
689 u8 tos
= tunnel
->parms
.iph
.tos
;
690 __be16 df
= tiph
->frag_off
;
691 struct rtable
*rt
; /* Route to the other host */
692 struct net_device
*tdev
; /* Device to other host */
693 struct iphdr
*iph
; /* Our new IP header */
694 unsigned int max_headroom
; /* The extra header space needed */
695 __be32 dst
= tiph
->daddr
;
698 const struct in6_addr
*addr6
;
701 if (skb
->protocol
!= htons(ETH_P_IPV6
))
705 tos
= ipv6_get_dsfield(iph6
);
707 /* ISATAP (RFC4214) - must come before 6to4 */
708 if (dev
->priv_flags
& IFF_ISATAP
) {
709 struct neighbour
*neigh
= NULL
;
710 bool do_tx_error
= false;
713 neigh
= dst_neigh_lookup(skb_dst(skb
), &iph6
->daddr
);
716 net_dbg_ratelimited("sit: nexthop == NULL\n");
720 addr6
= (const struct in6_addr
*)&neigh
->primary_key
;
721 addr_type
= ipv6_addr_type(addr6
);
723 if ((addr_type
& IPV6_ADDR_UNICAST
) &&
724 ipv6_addr_is_isatap(addr6
))
725 dst
= addr6
->s6_addr32
[3];
729 neigh_release(neigh
);
735 dst
= try_6rd(&iph6
->daddr
, tunnel
);
738 struct neighbour
*neigh
= NULL
;
739 bool do_tx_error
= false;
742 neigh
= dst_neigh_lookup(skb_dst(skb
), &iph6
->daddr
);
745 net_dbg_ratelimited("sit: nexthop == NULL\n");
749 addr6
= (const struct in6_addr
*)&neigh
->primary_key
;
750 addr_type
= ipv6_addr_type(addr6
);
752 if (addr_type
== IPV6_ADDR_ANY
) {
753 addr6
= &ipv6_hdr(skb
)->daddr
;
754 addr_type
= ipv6_addr_type(addr6
);
757 if ((addr_type
& IPV6_ADDR_COMPATv4
) != 0)
758 dst
= addr6
->s6_addr32
[3];
762 neigh_release(neigh
);
767 rt
= ip_route_output_ports(dev_net(dev
), &fl4
, NULL
,
770 IPPROTO_IPV6
, RT_TOS(tos
),
773 dev
->stats
.tx_carrier_errors
++;
776 if (rt
->rt_type
!= RTN_UNICAST
) {
778 dev
->stats
.tx_carrier_errors
++;
785 dev
->stats
.collisions
++;
790 mtu
= dst_mtu(&rt
->dst
) - sizeof(struct iphdr
);
793 dev
->stats
.collisions
++;
798 if (mtu
< IPV6_MIN_MTU
) {
803 if (tunnel
->parms
.iph
.daddr
&& skb_dst(skb
))
804 skb_dst(skb
)->ops
->update_pmtu(skb_dst(skb
), NULL
, skb
, mtu
);
806 if (skb
->len
> mtu
) {
807 icmpv6_send(skb
, ICMPV6_PKT_TOOBIG
, 0, mtu
);
813 if (tunnel
->err_count
> 0) {
814 if (time_before(jiffies
,
815 tunnel
->err_time
+ IPTUNNEL_ERR_TIMEO
)) {
817 dst_link_failure(skb
);
819 tunnel
->err_count
= 0;
823 * Okay, now see if we can stuff it in the buffer as-is.
825 max_headroom
= LL_RESERVED_SPACE(tdev
)+sizeof(struct iphdr
);
827 if (skb_headroom(skb
) < max_headroom
|| skb_shared(skb
) ||
828 (skb_cloned(skb
) && !skb_clone_writable(skb
, 0))) {
829 struct sk_buff
*new_skb
= skb_realloc_headroom(skb
, max_headroom
);
832 dev
->stats
.tx_dropped
++;
837 skb_set_owner_w(new_skb
, skb
->sk
);
840 iph6
= ipv6_hdr(skb
);
843 skb
->transport_header
= skb
->network_header
;
844 skb_push(skb
, sizeof(struct iphdr
));
845 skb_reset_network_header(skb
);
846 memset(&(IPCB(skb
)->opt
), 0, sizeof(IPCB(skb
)->opt
));
847 IPCB(skb
)->flags
= 0;
849 skb_dst_set(skb
, &rt
->dst
);
852 * Push down and install the IPIP header.
857 iph
->ihl
= sizeof(struct iphdr
)>>2;
859 iph
->protocol
= IPPROTO_IPV6
;
860 iph
->tos
= INET_ECN_encapsulate(tos
, ipv6_get_dsfield(iph6
));
861 iph
->daddr
= fl4
.daddr
;
862 iph
->saddr
= fl4
.saddr
;
864 if ((iph
->ttl
= tiph
->ttl
) == 0)
865 iph
->ttl
= iph6
->hop_limit
;
868 tstats
= this_cpu_ptr(dev
->tstats
);
869 __IPTUNNEL_XMIT(tstats
, &dev
->stats
);
873 dst_link_failure(skb
);
875 dev
->stats
.tx_errors
++;
880 static void ipip6_tunnel_bind_dev(struct net_device
*dev
)
882 struct net_device
*tdev
= NULL
;
883 struct ip_tunnel
*tunnel
;
884 const struct iphdr
*iph
;
887 tunnel
= netdev_priv(dev
);
888 iph
= &tunnel
->parms
.iph
;
891 struct rtable
*rt
= ip_route_output_ports(dev_net(dev
), &fl4
, NULL
,
892 iph
->daddr
, iph
->saddr
,
902 dev
->flags
|= IFF_POINTOPOINT
;
905 if (!tdev
&& tunnel
->parms
.link
)
906 tdev
= __dev_get_by_index(dev_net(dev
), tunnel
->parms
.link
);
909 dev
->hard_header_len
= tdev
->hard_header_len
+ sizeof(struct iphdr
);
910 dev
->mtu
= tdev
->mtu
- sizeof(struct iphdr
);
911 if (dev
->mtu
< IPV6_MIN_MTU
)
912 dev
->mtu
= IPV6_MIN_MTU
;
914 dev
->iflink
= tunnel
->parms
.link
;
918 ipip6_tunnel_ioctl (struct net_device
*dev
, struct ifreq
*ifr
, int cmd
)
921 struct ip_tunnel_parm p
;
922 struct ip_tunnel_prl prl
;
924 struct net
*net
= dev_net(dev
);
925 struct sit_net
*sitn
= net_generic(net
, sit_net_id
);
926 #ifdef CONFIG_IPV6_SIT_6RD
927 struct ip_tunnel_6rd ip6rd
;
932 #ifdef CONFIG_IPV6_SIT_6RD
936 if (dev
== sitn
->fb_tunnel_dev
) {
937 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
))) {
941 t
= ipip6_tunnel_locate(net
, &p
, 0);
944 t
= netdev_priv(dev
);
947 if (cmd
== SIOCGETTUNNEL
) {
948 memcpy(&p
, &t
->parms
, sizeof(p
));
949 if (copy_to_user(ifr
->ifr_ifru
.ifru_data
, &p
,
952 #ifdef CONFIG_IPV6_SIT_6RD
954 ip6rd
.prefix
= t
->ip6rd
.prefix
;
955 ip6rd
.relay_prefix
= t
->ip6rd
.relay_prefix
;
956 ip6rd
.prefixlen
= t
->ip6rd
.prefixlen
;
957 ip6rd
.relay_prefixlen
= t
->ip6rd
.relay_prefixlen
;
958 if (copy_to_user(ifr
->ifr_ifru
.ifru_data
, &ip6rd
,
969 if (!capable(CAP_NET_ADMIN
))
973 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
)))
977 if (p
.iph
.version
!= 4 || p
.iph
.protocol
!= IPPROTO_IPV6
||
978 p
.iph
.ihl
!= 5 || (p
.iph
.frag_off
&htons(~IP_DF
)))
981 p
.iph
.frag_off
|= htons(IP_DF
);
983 t
= ipip6_tunnel_locate(net
, &p
, cmd
== SIOCADDTUNNEL
);
985 if (dev
!= sitn
->fb_tunnel_dev
&& cmd
== SIOCCHGTUNNEL
) {
992 if (((dev
->flags
&IFF_POINTOPOINT
) && !p
.iph
.daddr
) ||
993 (!(dev
->flags
&IFF_POINTOPOINT
) && p
.iph
.daddr
)) {
997 t
= netdev_priv(dev
);
998 ipip6_tunnel_unlink(sitn
, t
);
1000 t
->parms
.iph
.saddr
= p
.iph
.saddr
;
1001 t
->parms
.iph
.daddr
= p
.iph
.daddr
;
1002 memcpy(dev
->dev_addr
, &p
.iph
.saddr
, 4);
1003 memcpy(dev
->broadcast
, &p
.iph
.daddr
, 4);
1004 ipip6_tunnel_link(sitn
, t
);
1005 netdev_state_change(dev
);
1011 if (cmd
== SIOCCHGTUNNEL
) {
1012 t
->parms
.iph
.ttl
= p
.iph
.ttl
;
1013 t
->parms
.iph
.tos
= p
.iph
.tos
;
1014 if (t
->parms
.link
!= p
.link
) {
1015 t
->parms
.link
= p
.link
;
1016 ipip6_tunnel_bind_dev(dev
);
1017 netdev_state_change(dev
);
1020 if (copy_to_user(ifr
->ifr_ifru
.ifru_data
, &t
->parms
, sizeof(p
)))
1023 err
= (cmd
== SIOCADDTUNNEL
? -ENOBUFS
: -ENOENT
);
1028 if (!capable(CAP_NET_ADMIN
))
1031 if (dev
== sitn
->fb_tunnel_dev
) {
1033 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
)))
1036 if ((t
= ipip6_tunnel_locate(net
, &p
, 0)) == NULL
)
1039 if (t
== netdev_priv(sitn
->fb_tunnel_dev
))
1043 unregister_netdevice(dev
);
1049 if (dev
== sitn
->fb_tunnel_dev
)
1052 if (!(t
= netdev_priv(dev
)))
1054 err
= ipip6_tunnel_get_prl(t
, ifr
->ifr_ifru
.ifru_data
);
1061 if (!capable(CAP_NET_ADMIN
))
1064 if (dev
== sitn
->fb_tunnel_dev
)
1067 if (copy_from_user(&prl
, ifr
->ifr_ifru
.ifru_data
, sizeof(prl
)))
1070 if (!(t
= netdev_priv(dev
)))
1075 err
= ipip6_tunnel_del_prl(t
, &prl
);
1079 err
= ipip6_tunnel_add_prl(t
, &prl
, cmd
== SIOCCHGPRL
);
1082 netdev_state_change(dev
);
1085 #ifdef CONFIG_IPV6_SIT_6RD
1090 if (!capable(CAP_NET_ADMIN
))
1094 if (copy_from_user(&ip6rd
, ifr
->ifr_ifru
.ifru_data
,
1098 t
= netdev_priv(dev
);
1100 if (cmd
!= SIOCDEL6RD
) {
1101 struct in6_addr prefix
;
1102 __be32 relay_prefix
;
1105 if (ip6rd
.relay_prefixlen
> 32 ||
1106 ip6rd
.prefixlen
+ (32 - ip6rd
.relay_prefixlen
) > 64)
1109 ipv6_addr_prefix(&prefix
, &ip6rd
.prefix
,
1111 if (!ipv6_addr_equal(&prefix
, &ip6rd
.prefix
))
1113 if (ip6rd
.relay_prefixlen
)
1114 relay_prefix
= ip6rd
.relay_prefix
&
1115 htonl(0xffffffffUL
<<
1116 (32 - ip6rd
.relay_prefixlen
));
1119 if (relay_prefix
!= ip6rd
.relay_prefix
)
1122 t
->ip6rd
.prefix
= prefix
;
1123 t
->ip6rd
.relay_prefix
= relay_prefix
;
1124 t
->ip6rd
.prefixlen
= ip6rd
.prefixlen
;
1125 t
->ip6rd
.relay_prefixlen
= ip6rd
.relay_prefixlen
;
1127 ipip6_tunnel_clone_6rd(dev
, sitn
);
1141 static int ipip6_tunnel_change_mtu(struct net_device
*dev
, int new_mtu
)
1143 if (new_mtu
< IPV6_MIN_MTU
|| new_mtu
> 0xFFF8 - sizeof(struct iphdr
))
1149 static const struct net_device_ops ipip6_netdev_ops
= {
1150 .ndo_uninit
= ipip6_tunnel_uninit
,
1151 .ndo_start_xmit
= ipip6_tunnel_xmit
,
1152 .ndo_do_ioctl
= ipip6_tunnel_ioctl
,
1153 .ndo_change_mtu
= ipip6_tunnel_change_mtu
,
1154 .ndo_get_stats64
= ipip6_get_stats64
,
1157 static void ipip6_dev_free(struct net_device
*dev
)
1159 free_percpu(dev
->tstats
);
1163 static void ipip6_tunnel_setup(struct net_device
*dev
)
1165 dev
->netdev_ops
= &ipip6_netdev_ops
;
1166 dev
->destructor
= ipip6_dev_free
;
1168 dev
->type
= ARPHRD_SIT
;
1169 dev
->hard_header_len
= LL_MAX_HEADER
+ sizeof(struct iphdr
);
1170 dev
->mtu
= ETH_DATA_LEN
- sizeof(struct iphdr
);
1171 dev
->flags
= IFF_NOARP
;
1172 dev
->priv_flags
&= ~IFF_XMIT_DST_RELEASE
;
1175 dev
->features
|= NETIF_F_NETNS_LOCAL
;
1176 dev
->features
|= NETIF_F_LLTX
;
1179 static int ipip6_tunnel_init(struct net_device
*dev
)
1181 struct ip_tunnel
*tunnel
= netdev_priv(dev
);
1185 memcpy(dev
->dev_addr
, &tunnel
->parms
.iph
.saddr
, 4);
1186 memcpy(dev
->broadcast
, &tunnel
->parms
.iph
.daddr
, 4);
1188 ipip6_tunnel_bind_dev(dev
);
1189 dev
->tstats
= alloc_percpu(struct pcpu_tstats
);
1196 static int __net_init
ipip6_fb_tunnel_init(struct net_device
*dev
)
1198 struct ip_tunnel
*tunnel
= netdev_priv(dev
);
1199 struct iphdr
*iph
= &tunnel
->parms
.iph
;
1200 struct net
*net
= dev_net(dev
);
1201 struct sit_net
*sitn
= net_generic(net
, sit_net_id
);
1204 strcpy(tunnel
->parms
.name
, dev
->name
);
1207 iph
->protocol
= IPPROTO_IPV6
;
1211 dev
->tstats
= alloc_percpu(struct pcpu_tstats
);
1215 rcu_assign_pointer(sitn
->tunnels_wc
[0], tunnel
);
1219 static struct xfrm_tunnel sit_handler __read_mostly
= {
1220 .handler
= ipip6_rcv
,
1221 .err_handler
= ipip6_err
,
1225 static void __net_exit
sit_destroy_tunnels(struct sit_net
*sitn
, struct list_head
*head
)
1229 for (prio
= 1; prio
< 4; prio
++) {
1231 for (h
= 0; h
< HASH_SIZE
; h
++) {
1232 struct ip_tunnel
*t
;
1234 t
= rtnl_dereference(sitn
->tunnels
[prio
][h
]);
1236 unregister_netdevice_queue(t
->dev
, head
);
1237 t
= rtnl_dereference(t
->next
);
1243 static int __net_init
sit_init_net(struct net
*net
)
1245 struct sit_net
*sitn
= net_generic(net
, sit_net_id
);
1246 struct ip_tunnel
*t
;
1249 sitn
->tunnels
[0] = sitn
->tunnels_wc
;
1250 sitn
->tunnels
[1] = sitn
->tunnels_l
;
1251 sitn
->tunnels
[2] = sitn
->tunnels_r
;
1252 sitn
->tunnels
[3] = sitn
->tunnels_r_l
;
1254 sitn
->fb_tunnel_dev
= alloc_netdev(sizeof(struct ip_tunnel
), "sit0",
1255 ipip6_tunnel_setup
);
1256 if (!sitn
->fb_tunnel_dev
) {
1260 dev_net_set(sitn
->fb_tunnel_dev
, net
);
1262 err
= ipip6_fb_tunnel_init(sitn
->fb_tunnel_dev
);
1266 ipip6_tunnel_clone_6rd(sitn
->fb_tunnel_dev
, sitn
);
1268 if ((err
= register_netdev(sitn
->fb_tunnel_dev
)))
1271 t
= netdev_priv(sitn
->fb_tunnel_dev
);
1273 strcpy(t
->parms
.name
, sitn
->fb_tunnel_dev
->name
);
1277 dev_put(sitn
->fb_tunnel_dev
);
1279 ipip6_dev_free(sitn
->fb_tunnel_dev
);
1284 static void __net_exit
sit_exit_net(struct net
*net
)
1286 struct sit_net
*sitn
= net_generic(net
, sit_net_id
);
1290 sit_destroy_tunnels(sitn
, &list
);
1291 unregister_netdevice_queue(sitn
->fb_tunnel_dev
, &list
);
1292 unregister_netdevice_many(&list
);
1296 static struct pernet_operations sit_net_ops
= {
1297 .init
= sit_init_net
,
1298 .exit
= sit_exit_net
,
1300 .size
= sizeof(struct sit_net
),
1303 static void __exit
sit_cleanup(void)
1305 xfrm4_tunnel_deregister(&sit_handler
, AF_INET6
);
1307 unregister_pernet_device(&sit_net_ops
);
1308 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1311 static int __init
sit_init(void)
1315 pr_info("IPv6 over IPv4 tunneling driver\n");
1317 err
= register_pernet_device(&sit_net_ops
);
1320 err
= xfrm4_tunnel_register(&sit_handler
, AF_INET6
);
1322 unregister_pernet_device(&sit_net_ops
);
1323 pr_info("%s: can't add protocol\n", __func__
);
1328 module_init(sit_init
);
1329 module_exit(sit_cleanup
);
1330 MODULE_LICENSE("GPL");
1331 MODULE_ALIAS_NETDEV("sit0");