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 bool log_ecn_error
= true;
69 module_param(log_ecn_error
, bool, 0644);
70 MODULE_PARM_DESC(log_ecn_error
, "Log packets received with corrupted ECN");
72 static int ipip6_tunnel_init(struct net_device
*dev
);
73 static void ipip6_tunnel_setup(struct net_device
*dev
);
74 static void ipip6_dev_free(struct net_device
*dev
);
75 static bool check_6rd(struct ip_tunnel
*tunnel
, const struct in6_addr
*v6dst
,
77 static struct rtnl_link_ops sit_link_ops __read_mostly
;
79 static int sit_net_id __read_mostly
;
81 struct ip_tunnel __rcu
*tunnels_r_l
[HASH_SIZE
];
82 struct ip_tunnel __rcu
*tunnels_r
[HASH_SIZE
];
83 struct ip_tunnel __rcu
*tunnels_l
[HASH_SIZE
];
84 struct ip_tunnel __rcu
*tunnels_wc
[1];
85 struct ip_tunnel __rcu
**tunnels
[4];
87 struct net_device
*fb_tunnel_dev
;
90 static struct rtnl_link_stats64
*ipip6_get_stats64(struct net_device
*dev
,
91 struct rtnl_link_stats64
*tot
)
95 for_each_possible_cpu(i
) {
96 const struct pcpu_tstats
*tstats
= per_cpu_ptr(dev
->tstats
, i
);
97 u64 rx_packets
, rx_bytes
, tx_packets
, tx_bytes
;
101 start
= u64_stats_fetch_begin_bh(&tstats
->syncp
);
102 rx_packets
= tstats
->rx_packets
;
103 tx_packets
= tstats
->tx_packets
;
104 rx_bytes
= tstats
->rx_bytes
;
105 tx_bytes
= tstats
->tx_bytes
;
106 } while (u64_stats_fetch_retry_bh(&tstats
->syncp
, start
));
108 tot
->rx_packets
+= rx_packets
;
109 tot
->tx_packets
+= tx_packets
;
110 tot
->rx_bytes
+= rx_bytes
;
111 tot
->tx_bytes
+= tx_bytes
;
114 tot
->rx_errors
= dev
->stats
.rx_errors
;
115 tot
->rx_frame_errors
= dev
->stats
.rx_frame_errors
;
116 tot
->tx_fifo_errors
= dev
->stats
.tx_fifo_errors
;
117 tot
->tx_carrier_errors
= dev
->stats
.tx_carrier_errors
;
118 tot
->tx_dropped
= dev
->stats
.tx_dropped
;
119 tot
->tx_aborted_errors
= dev
->stats
.tx_aborted_errors
;
120 tot
->tx_errors
= dev
->stats
.tx_errors
;
126 * Must be invoked with rcu_read_lock
128 static struct ip_tunnel
*ipip6_tunnel_lookup(struct net
*net
,
129 struct net_device
*dev
, __be32 remote
, __be32 local
)
131 unsigned int h0
= HASH(remote
);
132 unsigned int h1
= HASH(local
);
134 struct sit_net
*sitn
= net_generic(net
, sit_net_id
);
136 for_each_ip_tunnel_rcu(t
, sitn
->tunnels_r_l
[h0
^ h1
]) {
137 if (local
== t
->parms
.iph
.saddr
&&
138 remote
== t
->parms
.iph
.daddr
&&
139 (!dev
|| !t
->parms
.link
|| dev
->iflink
== t
->parms
.link
) &&
140 (t
->dev
->flags
& IFF_UP
))
143 for_each_ip_tunnel_rcu(t
, sitn
->tunnels_r
[h0
]) {
144 if (remote
== t
->parms
.iph
.daddr
&&
145 (!dev
|| !t
->parms
.link
|| dev
->iflink
== t
->parms
.link
) &&
146 (t
->dev
->flags
& IFF_UP
))
149 for_each_ip_tunnel_rcu(t
, sitn
->tunnels_l
[h1
]) {
150 if (local
== t
->parms
.iph
.saddr
&&
151 (!dev
|| !t
->parms
.link
|| dev
->iflink
== t
->parms
.link
) &&
152 (t
->dev
->flags
& IFF_UP
))
155 t
= rcu_dereference(sitn
->tunnels_wc
[0]);
156 if ((t
!= NULL
) && (t
->dev
->flags
& IFF_UP
))
161 static struct ip_tunnel __rcu
**__ipip6_bucket(struct sit_net
*sitn
,
162 struct ip_tunnel_parm
*parms
)
164 __be32 remote
= parms
->iph
.daddr
;
165 __be32 local
= parms
->iph
.saddr
;
177 return &sitn
->tunnels
[prio
][h
];
180 static inline struct ip_tunnel __rcu
**ipip6_bucket(struct sit_net
*sitn
,
183 return __ipip6_bucket(sitn
, &t
->parms
);
186 static void ipip6_tunnel_unlink(struct sit_net
*sitn
, struct ip_tunnel
*t
)
188 struct ip_tunnel __rcu
**tp
;
189 struct ip_tunnel
*iter
;
191 for (tp
= ipip6_bucket(sitn
, t
);
192 (iter
= rtnl_dereference(*tp
)) != NULL
;
195 rcu_assign_pointer(*tp
, t
->next
);
201 static void ipip6_tunnel_link(struct sit_net
*sitn
, struct ip_tunnel
*t
)
203 struct ip_tunnel __rcu
**tp
= ipip6_bucket(sitn
, t
);
205 rcu_assign_pointer(t
->next
, rtnl_dereference(*tp
));
206 rcu_assign_pointer(*tp
, t
);
209 static void ipip6_tunnel_clone_6rd(struct net_device
*dev
, struct sit_net
*sitn
)
211 #ifdef CONFIG_IPV6_SIT_6RD
212 struct ip_tunnel
*t
= netdev_priv(dev
);
214 if (t
->dev
== sitn
->fb_tunnel_dev
) {
215 ipv6_addr_set(&t
->ip6rd
.prefix
, htonl(0x20020000), 0, 0, 0);
216 t
->ip6rd
.relay_prefix
= 0;
217 t
->ip6rd
.prefixlen
= 16;
218 t
->ip6rd
.relay_prefixlen
= 0;
220 struct ip_tunnel
*t0
= netdev_priv(sitn
->fb_tunnel_dev
);
221 memcpy(&t
->ip6rd
, &t0
->ip6rd
, sizeof(t
->ip6rd
));
226 static int ipip6_tunnel_create(struct net_device
*dev
)
228 struct ip_tunnel
*t
= netdev_priv(dev
);
229 struct net
*net
= dev_net(dev
);
230 struct sit_net
*sitn
= net_generic(net
, sit_net_id
);
233 err
= ipip6_tunnel_init(dev
);
236 ipip6_tunnel_clone_6rd(dev
, sitn
);
238 if ((__force u16
)t
->parms
.i_flags
& SIT_ISATAP
)
239 dev
->priv_flags
|= IFF_ISATAP
;
241 err
= register_netdevice(dev
);
245 strcpy(t
->parms
.name
, dev
->name
);
246 dev
->rtnl_link_ops
= &sit_link_ops
;
250 ipip6_tunnel_link(sitn
, t
);
257 static struct ip_tunnel
*ipip6_tunnel_locate(struct net
*net
,
258 struct ip_tunnel_parm
*parms
, int create
)
260 __be32 remote
= parms
->iph
.daddr
;
261 __be32 local
= parms
->iph
.saddr
;
262 struct ip_tunnel
*t
, *nt
;
263 struct ip_tunnel __rcu
**tp
;
264 struct net_device
*dev
;
266 struct sit_net
*sitn
= net_generic(net
, sit_net_id
);
268 for (tp
= __ipip6_bucket(sitn
, parms
);
269 (t
= rtnl_dereference(*tp
)) != NULL
;
271 if (local
== t
->parms
.iph
.saddr
&&
272 remote
== t
->parms
.iph
.daddr
&&
273 parms
->link
== t
->parms
.link
) {
284 strlcpy(name
, parms
->name
, IFNAMSIZ
);
286 strcpy(name
, "sit%d");
288 dev
= alloc_netdev(sizeof(*t
), name
, ipip6_tunnel_setup
);
292 dev_net_set(dev
, net
);
294 nt
= netdev_priv(dev
);
297 if (ipip6_tunnel_create(dev
) < 0)
308 #define for_each_prl_rcu(start) \
309 for (prl = rcu_dereference(start); \
311 prl = rcu_dereference(prl->next))
313 static struct ip_tunnel_prl_entry
*
314 __ipip6_tunnel_locate_prl(struct ip_tunnel
*t
, __be32 addr
)
316 struct ip_tunnel_prl_entry
*prl
;
318 for_each_prl_rcu(t
->prl
)
319 if (prl
->addr
== addr
)
325 static int ipip6_tunnel_get_prl(struct ip_tunnel
*t
,
326 struct ip_tunnel_prl __user
*a
)
328 struct ip_tunnel_prl kprl
, *kp
;
329 struct ip_tunnel_prl_entry
*prl
;
330 unsigned int cmax
, c
= 0, ca
, len
;
333 if (copy_from_user(&kprl
, a
, sizeof(kprl
)))
335 cmax
= kprl
.datalen
/ sizeof(kprl
);
336 if (cmax
> 1 && kprl
.addr
!= htonl(INADDR_ANY
))
339 /* For simple GET or for root users,
340 * we try harder to allocate.
342 kp
= (cmax
<= 1 || capable(CAP_NET_ADMIN
)) ?
343 kcalloc(cmax
, sizeof(*kp
), GFP_KERNEL
) :
348 ca
= t
->prl_count
< cmax
? t
->prl_count
: cmax
;
351 /* We don't try hard to allocate much memory for
353 * For root users, retry allocating enough memory for
356 kp
= kcalloc(ca
, sizeof(*kp
), GFP_ATOMIC
);
364 for_each_prl_rcu(t
->prl
) {
367 if (kprl
.addr
!= htonl(INADDR_ANY
) && prl
->addr
!= kprl
.addr
)
369 kp
[c
].addr
= prl
->addr
;
370 kp
[c
].flags
= prl
->flags
;
372 if (kprl
.addr
!= htonl(INADDR_ANY
))
378 len
= sizeof(*kp
) * c
;
380 if ((len
&& copy_to_user(a
+ 1, kp
, len
)) || put_user(len
, &a
->datalen
))
389 ipip6_tunnel_add_prl(struct ip_tunnel
*t
, struct ip_tunnel_prl
*a
, int chg
)
391 struct ip_tunnel_prl_entry
*p
;
394 if (a
->addr
== htonl(INADDR_ANY
))
399 for (p
= rtnl_dereference(t
->prl
); p
; p
= rtnl_dereference(p
->next
)) {
400 if (p
->addr
== a
->addr
) {
415 p
= kzalloc(sizeof(struct ip_tunnel_prl_entry
), GFP_KERNEL
);
425 rcu_assign_pointer(t
->prl
, p
);
430 static void prl_list_destroy_rcu(struct rcu_head
*head
)
432 struct ip_tunnel_prl_entry
*p
, *n
;
434 p
= container_of(head
, struct ip_tunnel_prl_entry
, rcu_head
);
436 n
= rcu_dereference_protected(p
->next
, 1);
443 ipip6_tunnel_del_prl(struct ip_tunnel
*t
, struct ip_tunnel_prl
*a
)
445 struct ip_tunnel_prl_entry
*x
;
446 struct ip_tunnel_prl_entry __rcu
**p
;
451 if (a
&& a
->addr
!= htonl(INADDR_ANY
)) {
453 (x
= rtnl_dereference(*p
)) != NULL
;
455 if (x
->addr
== a
->addr
) {
457 kfree_rcu(x
, rcu_head
);
464 x
= rtnl_dereference(t
->prl
);
467 call_rcu(&x
->rcu_head
, prl_list_destroy_rcu
);
476 isatap_chksrc(struct sk_buff
*skb
, const struct iphdr
*iph
, struct ip_tunnel
*t
)
478 struct ip_tunnel_prl_entry
*p
;
482 p
= __ipip6_tunnel_locate_prl(t
, iph
->saddr
);
484 if (p
->flags
& PRL_DEFAULT
)
485 skb
->ndisc_nodetype
= NDISC_NODETYPE_DEFAULT
;
487 skb
->ndisc_nodetype
= NDISC_NODETYPE_NODEFAULT
;
489 const struct in6_addr
*addr6
= &ipv6_hdr(skb
)->saddr
;
491 if (ipv6_addr_is_isatap(addr6
) &&
492 (addr6
->s6_addr32
[3] == iph
->saddr
) &&
493 ipv6_chk_prefix(addr6
, t
->dev
))
494 skb
->ndisc_nodetype
= NDISC_NODETYPE_HOST
;
502 static void ipip6_tunnel_uninit(struct net_device
*dev
)
504 struct net
*net
= dev_net(dev
);
505 struct sit_net
*sitn
= net_generic(net
, sit_net_id
);
507 if (dev
== sitn
->fb_tunnel_dev
) {
508 RCU_INIT_POINTER(sitn
->tunnels_wc
[0], NULL
);
510 ipip6_tunnel_unlink(sitn
, netdev_priv(dev
));
511 ipip6_tunnel_del_prl(netdev_priv(dev
), NULL
);
517 static int ipip6_err(struct sk_buff
*skb
, u32 info
)
520 /* All the routers (except for Linux) return only
521 8 bytes of packet payload. It means, that precise relaying of
522 ICMP in the real Internet is absolutely infeasible.
524 const struct iphdr
*iph
= (const struct iphdr
*)skb
->data
;
525 const int type
= icmp_hdr(skb
)->type
;
526 const int code
= icmp_hdr(skb
)->code
;
532 case ICMP_PARAMETERPROB
:
535 case ICMP_DEST_UNREACH
:
538 case ICMP_PORT_UNREACH
:
539 /* Impossible event. */
542 /* All others are translated to HOST_UNREACH.
543 rfc2003 contains "deep thoughts" about NET_UNREACH,
544 I believe they are just ether pollution. --ANK
549 case ICMP_TIME_EXCEEDED
:
550 if (code
!= ICMP_EXC_TTL
)
559 t
= ipip6_tunnel_lookup(dev_net(skb
->dev
),
566 if (type
== ICMP_DEST_UNREACH
&& code
== ICMP_FRAG_NEEDED
) {
567 ipv4_update_pmtu(skb
, dev_net(skb
->dev
), info
,
568 t
->dev
->ifindex
, 0, IPPROTO_IPV6
, 0);
572 if (type
== ICMP_REDIRECT
) {
573 ipv4_redirect(skb
, dev_net(skb
->dev
), t
->dev
->ifindex
, 0,
579 if (t
->parms
.iph
.daddr
== 0)
583 if (t
->parms
.iph
.ttl
== 0 && type
== ICMP_TIME_EXCEEDED
)
586 if (time_before(jiffies
, t
->err_time
+ IPTUNNEL_ERR_TIMEO
))
590 t
->err_time
= jiffies
;
595 static inline bool is_spoofed_6rd(struct ip_tunnel
*tunnel
, const __be32 v4addr
,
596 const struct in6_addr
*v6addr
)
599 if (check_6rd(tunnel
, v6addr
, &v4embed
) && v4addr
!= v4embed
)
604 static int ipip6_rcv(struct sk_buff
*skb
)
606 const struct iphdr
*iph
= ip_hdr(skb
);
607 struct ip_tunnel
*tunnel
;
610 tunnel
= ipip6_tunnel_lookup(dev_net(skb
->dev
), skb
->dev
,
611 iph
->saddr
, iph
->daddr
);
612 if (tunnel
!= NULL
) {
613 struct pcpu_tstats
*tstats
;
616 skb
->mac_header
= skb
->network_header
;
617 skb_reset_network_header(skb
);
618 IPCB(skb
)->flags
= 0;
619 skb
->protocol
= htons(ETH_P_IPV6
);
620 skb
->pkt_type
= PACKET_HOST
;
622 if (tunnel
->dev
->priv_flags
& IFF_ISATAP
) {
623 if (!isatap_chksrc(skb
, iph
, tunnel
)) {
624 tunnel
->dev
->stats
.rx_errors
++;
628 if (is_spoofed_6rd(tunnel
, iph
->saddr
,
629 &ipv6_hdr(skb
)->saddr
) ||
630 is_spoofed_6rd(tunnel
, iph
->daddr
,
631 &ipv6_hdr(skb
)->daddr
)) {
632 tunnel
->dev
->stats
.rx_errors
++;
637 __skb_tunnel_rx(skb
, tunnel
->dev
);
639 err
= IP_ECN_decapsulate(iph
, skb
);
642 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
643 &iph
->saddr
, iph
->tos
);
645 ++tunnel
->dev
->stats
.rx_frame_errors
;
646 ++tunnel
->dev
->stats
.rx_errors
;
651 tstats
= this_cpu_ptr(tunnel
->dev
->tstats
);
652 tstats
->rx_packets
++;
653 tstats
->rx_bytes
+= skb
->len
;
660 /* no tunnel matched, let upstream know, ipsec may handle it */
668 * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function
669 * stores the embedded IPv4 address in v4dst and returns true.
671 static bool check_6rd(struct ip_tunnel
*tunnel
, const struct in6_addr
*v6dst
,
674 #ifdef CONFIG_IPV6_SIT_6RD
675 if (ipv6_prefix_equal(v6dst
, &tunnel
->ip6rd
.prefix
,
676 tunnel
->ip6rd
.prefixlen
)) {
677 unsigned int pbw0
, pbi0
;
681 pbw0
= tunnel
->ip6rd
.prefixlen
>> 5;
682 pbi0
= tunnel
->ip6rd
.prefixlen
& 0x1f;
684 d
= (ntohl(v6dst
->s6_addr32
[pbw0
]) << pbi0
) >>
685 tunnel
->ip6rd
.relay_prefixlen
;
687 pbi1
= pbi0
- tunnel
->ip6rd
.relay_prefixlen
;
689 d
|= ntohl(v6dst
->s6_addr32
[pbw0
+ 1]) >>
692 *v4dst
= tunnel
->ip6rd
.relay_prefix
| htonl(d
);
696 if (v6dst
->s6_addr16
[0] == htons(0x2002)) {
697 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
698 memcpy(v4dst
, &v6dst
->s6_addr16
[1], 4);
705 static inline __be32
try_6rd(struct ip_tunnel
*tunnel
,
706 const struct in6_addr
*v6dst
)
709 check_6rd(tunnel
, v6dst
, &dst
);
714 * This function assumes it is being called from dev_queue_xmit()
715 * and that skb is filled properly by that function.
718 static netdev_tx_t
ipip6_tunnel_xmit(struct sk_buff
*skb
,
719 struct net_device
*dev
)
721 struct ip_tunnel
*tunnel
= netdev_priv(dev
);
722 const struct iphdr
*tiph
= &tunnel
->parms
.iph
;
723 const struct ipv6hdr
*iph6
= ipv6_hdr(skb
);
724 u8 tos
= tunnel
->parms
.iph
.tos
;
725 __be16 df
= tiph
->frag_off
;
726 struct rtable
*rt
; /* Route to the other host */
727 struct net_device
*tdev
; /* Device to other host */
728 struct iphdr
*iph
; /* Our new IP header */
729 unsigned int max_headroom
; /* The extra header space needed */
730 __be32 dst
= tiph
->daddr
;
733 const struct in6_addr
*addr6
;
736 if (skb
->protocol
!= htons(ETH_P_IPV6
))
740 tos
= ipv6_get_dsfield(iph6
);
742 /* ISATAP (RFC4214) - must come before 6to4 */
743 if (dev
->priv_flags
& IFF_ISATAP
) {
744 struct neighbour
*neigh
= NULL
;
745 bool do_tx_error
= false;
748 neigh
= dst_neigh_lookup(skb_dst(skb
), &iph6
->daddr
);
751 net_dbg_ratelimited("sit: nexthop == NULL\n");
755 addr6
= (const struct in6_addr
*)&neigh
->primary_key
;
756 addr_type
= ipv6_addr_type(addr6
);
758 if ((addr_type
& IPV6_ADDR_UNICAST
) &&
759 ipv6_addr_is_isatap(addr6
))
760 dst
= addr6
->s6_addr32
[3];
764 neigh_release(neigh
);
770 dst
= try_6rd(tunnel
, &iph6
->daddr
);
773 struct neighbour
*neigh
= NULL
;
774 bool do_tx_error
= false;
777 neigh
= dst_neigh_lookup(skb_dst(skb
), &iph6
->daddr
);
780 net_dbg_ratelimited("sit: nexthop == NULL\n");
784 addr6
= (const struct in6_addr
*)&neigh
->primary_key
;
785 addr_type
= ipv6_addr_type(addr6
);
787 if (addr_type
== IPV6_ADDR_ANY
) {
788 addr6
= &ipv6_hdr(skb
)->daddr
;
789 addr_type
= ipv6_addr_type(addr6
);
792 if ((addr_type
& IPV6_ADDR_COMPATv4
) != 0)
793 dst
= addr6
->s6_addr32
[3];
797 neigh_release(neigh
);
802 rt
= ip_route_output_ports(dev_net(dev
), &fl4
, NULL
,
805 IPPROTO_IPV6
, RT_TOS(tos
),
808 dev
->stats
.tx_carrier_errors
++;
811 if (rt
->rt_type
!= RTN_UNICAST
) {
813 dev
->stats
.tx_carrier_errors
++;
820 dev
->stats
.collisions
++;
825 mtu
= dst_mtu(&rt
->dst
) - sizeof(struct iphdr
);
828 dev
->stats
.collisions
++;
833 if (mtu
< IPV6_MIN_MTU
) {
838 if (tunnel
->parms
.iph
.daddr
&& skb_dst(skb
))
839 skb_dst(skb
)->ops
->update_pmtu(skb_dst(skb
), NULL
, skb
, mtu
);
841 if (skb
->len
> mtu
) {
842 icmpv6_send(skb
, ICMPV6_PKT_TOOBIG
, 0, mtu
);
848 if (tunnel
->err_count
> 0) {
849 if (time_before(jiffies
,
850 tunnel
->err_time
+ IPTUNNEL_ERR_TIMEO
)) {
852 dst_link_failure(skb
);
854 tunnel
->err_count
= 0;
858 * Okay, now see if we can stuff it in the buffer as-is.
860 max_headroom
= LL_RESERVED_SPACE(tdev
)+sizeof(struct iphdr
);
862 if (skb_headroom(skb
) < max_headroom
|| skb_shared(skb
) ||
863 (skb_cloned(skb
) && !skb_clone_writable(skb
, 0))) {
864 struct sk_buff
*new_skb
= skb_realloc_headroom(skb
, max_headroom
);
867 dev
->stats
.tx_dropped
++;
872 skb_set_owner_w(new_skb
, skb
->sk
);
875 iph6
= ipv6_hdr(skb
);
878 skb
->transport_header
= skb
->network_header
;
879 skb_push(skb
, sizeof(struct iphdr
));
880 skb_reset_network_header(skb
);
881 memset(&(IPCB(skb
)->opt
), 0, sizeof(IPCB(skb
)->opt
));
882 IPCB(skb
)->flags
= 0;
884 skb_dst_set(skb
, &rt
->dst
);
887 * Push down and install the IPIP header.
892 iph
->ihl
= sizeof(struct iphdr
)>>2;
894 iph
->protocol
= IPPROTO_IPV6
;
895 iph
->tos
= INET_ECN_encapsulate(tos
, ipv6_get_dsfield(iph6
));
896 iph
->daddr
= fl4
.daddr
;
897 iph
->saddr
= fl4
.saddr
;
899 if ((iph
->ttl
= tiph
->ttl
) == 0)
900 iph
->ttl
= iph6
->hop_limit
;
902 iptunnel_xmit(skb
, dev
);
906 dst_link_failure(skb
);
908 dev
->stats
.tx_errors
++;
913 static void ipip6_tunnel_bind_dev(struct net_device
*dev
)
915 struct net_device
*tdev
= NULL
;
916 struct ip_tunnel
*tunnel
;
917 const struct iphdr
*iph
;
920 tunnel
= netdev_priv(dev
);
921 iph
= &tunnel
->parms
.iph
;
924 struct rtable
*rt
= ip_route_output_ports(dev_net(dev
), &fl4
, NULL
,
925 iph
->daddr
, iph
->saddr
,
935 dev
->flags
|= IFF_POINTOPOINT
;
938 if (!tdev
&& tunnel
->parms
.link
)
939 tdev
= __dev_get_by_index(dev_net(dev
), tunnel
->parms
.link
);
942 dev
->hard_header_len
= tdev
->hard_header_len
+ sizeof(struct iphdr
);
943 dev
->mtu
= tdev
->mtu
- sizeof(struct iphdr
);
944 if (dev
->mtu
< IPV6_MIN_MTU
)
945 dev
->mtu
= IPV6_MIN_MTU
;
947 dev
->iflink
= tunnel
->parms
.link
;
950 static void ipip6_tunnel_update(struct ip_tunnel
*t
, struct ip_tunnel_parm
*p
)
952 struct net
*net
= dev_net(t
->dev
);
953 struct sit_net
*sitn
= net_generic(net
, sit_net_id
);
955 ipip6_tunnel_unlink(sitn
, t
);
957 t
->parms
.iph
.saddr
= p
->iph
.saddr
;
958 t
->parms
.iph
.daddr
= p
->iph
.daddr
;
959 memcpy(t
->dev
->dev_addr
, &p
->iph
.saddr
, 4);
960 memcpy(t
->dev
->broadcast
, &p
->iph
.daddr
, 4);
961 ipip6_tunnel_link(sitn
, t
);
962 t
->parms
.iph
.ttl
= p
->iph
.ttl
;
963 t
->parms
.iph
.tos
= p
->iph
.tos
;
964 if (t
->parms
.link
!= p
->link
) {
965 t
->parms
.link
= p
->link
;
966 ipip6_tunnel_bind_dev(t
->dev
);
968 netdev_state_change(t
->dev
);
971 #ifdef CONFIG_IPV6_SIT_6RD
972 static int ipip6_tunnel_update_6rd(struct ip_tunnel
*t
,
973 struct ip_tunnel_6rd
*ip6rd
)
975 struct in6_addr prefix
;
978 if (ip6rd
->relay_prefixlen
> 32 ||
979 ip6rd
->prefixlen
+ (32 - ip6rd
->relay_prefixlen
) > 64)
982 ipv6_addr_prefix(&prefix
, &ip6rd
->prefix
, ip6rd
->prefixlen
);
983 if (!ipv6_addr_equal(&prefix
, &ip6rd
->prefix
))
985 if (ip6rd
->relay_prefixlen
)
986 relay_prefix
= ip6rd
->relay_prefix
&
987 htonl(0xffffffffUL
<<
988 (32 - ip6rd
->relay_prefixlen
));
991 if (relay_prefix
!= ip6rd
->relay_prefix
)
994 t
->ip6rd
.prefix
= prefix
;
995 t
->ip6rd
.relay_prefix
= relay_prefix
;
996 t
->ip6rd
.prefixlen
= ip6rd
->prefixlen
;
997 t
->ip6rd
.relay_prefixlen
= ip6rd
->relay_prefixlen
;
998 netdev_state_change(t
->dev
);
1004 ipip6_tunnel_ioctl (struct net_device
*dev
, struct ifreq
*ifr
, int cmd
)
1007 struct ip_tunnel_parm p
;
1008 struct ip_tunnel_prl prl
;
1009 struct ip_tunnel
*t
;
1010 struct net
*net
= dev_net(dev
);
1011 struct sit_net
*sitn
= net_generic(net
, sit_net_id
);
1012 #ifdef CONFIG_IPV6_SIT_6RD
1013 struct ip_tunnel_6rd ip6rd
;
1018 #ifdef CONFIG_IPV6_SIT_6RD
1022 if (dev
== sitn
->fb_tunnel_dev
) {
1023 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
))) {
1027 t
= ipip6_tunnel_locate(net
, &p
, 0);
1030 t
= netdev_priv(dev
);
1033 if (cmd
== SIOCGETTUNNEL
) {
1034 memcpy(&p
, &t
->parms
, sizeof(p
));
1035 if (copy_to_user(ifr
->ifr_ifru
.ifru_data
, &p
,
1038 #ifdef CONFIG_IPV6_SIT_6RD
1040 ip6rd
.prefix
= t
->ip6rd
.prefix
;
1041 ip6rd
.relay_prefix
= t
->ip6rd
.relay_prefix
;
1042 ip6rd
.prefixlen
= t
->ip6rd
.prefixlen
;
1043 ip6rd
.relay_prefixlen
= t
->ip6rd
.relay_prefixlen
;
1044 if (copy_to_user(ifr
->ifr_ifru
.ifru_data
, &ip6rd
,
1055 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
1059 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
)))
1063 if (p
.iph
.version
!= 4 || p
.iph
.protocol
!= IPPROTO_IPV6
||
1064 p
.iph
.ihl
!= 5 || (p
.iph
.frag_off
&htons(~IP_DF
)))
1067 p
.iph
.frag_off
|= htons(IP_DF
);
1069 t
= ipip6_tunnel_locate(net
, &p
, cmd
== SIOCADDTUNNEL
);
1071 if (dev
!= sitn
->fb_tunnel_dev
&& cmd
== SIOCCHGTUNNEL
) {
1073 if (t
->dev
!= dev
) {
1078 if (((dev
->flags
&IFF_POINTOPOINT
) && !p
.iph
.daddr
) ||
1079 (!(dev
->flags
&IFF_POINTOPOINT
) && p
.iph
.daddr
)) {
1083 t
= netdev_priv(dev
);
1086 ipip6_tunnel_update(t
, &p
);
1091 if (copy_to_user(ifr
->ifr_ifru
.ifru_data
, &t
->parms
, sizeof(p
)))
1094 err
= (cmd
== SIOCADDTUNNEL
? -ENOBUFS
: -ENOENT
);
1099 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
1102 if (dev
== sitn
->fb_tunnel_dev
) {
1104 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
)))
1107 if ((t
= ipip6_tunnel_locate(net
, &p
, 0)) == NULL
)
1110 if (t
== netdev_priv(sitn
->fb_tunnel_dev
))
1114 unregister_netdevice(dev
);
1120 if (dev
== sitn
->fb_tunnel_dev
)
1123 if (!(t
= netdev_priv(dev
)))
1125 err
= ipip6_tunnel_get_prl(t
, ifr
->ifr_ifru
.ifru_data
);
1132 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
1135 if (dev
== sitn
->fb_tunnel_dev
)
1138 if (copy_from_user(&prl
, ifr
->ifr_ifru
.ifru_data
, sizeof(prl
)))
1141 if (!(t
= netdev_priv(dev
)))
1146 err
= ipip6_tunnel_del_prl(t
, &prl
);
1150 err
= ipip6_tunnel_add_prl(t
, &prl
, cmd
== SIOCCHGPRL
);
1153 netdev_state_change(dev
);
1156 #ifdef CONFIG_IPV6_SIT_6RD
1161 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
1165 if (copy_from_user(&ip6rd
, ifr
->ifr_ifru
.ifru_data
,
1169 t
= netdev_priv(dev
);
1171 if (cmd
!= SIOCDEL6RD
) {
1172 err
= ipip6_tunnel_update_6rd(t
, &ip6rd
);
1176 ipip6_tunnel_clone_6rd(dev
, sitn
);
1190 static int ipip6_tunnel_change_mtu(struct net_device
*dev
, int new_mtu
)
1192 if (new_mtu
< IPV6_MIN_MTU
|| new_mtu
> 0xFFF8 - sizeof(struct iphdr
))
1198 static const struct net_device_ops ipip6_netdev_ops
= {
1199 .ndo_uninit
= ipip6_tunnel_uninit
,
1200 .ndo_start_xmit
= ipip6_tunnel_xmit
,
1201 .ndo_do_ioctl
= ipip6_tunnel_ioctl
,
1202 .ndo_change_mtu
= ipip6_tunnel_change_mtu
,
1203 .ndo_get_stats64
= ipip6_get_stats64
,
1206 static void ipip6_dev_free(struct net_device
*dev
)
1208 free_percpu(dev
->tstats
);
1212 static void ipip6_tunnel_setup(struct net_device
*dev
)
1214 dev
->netdev_ops
= &ipip6_netdev_ops
;
1215 dev
->destructor
= ipip6_dev_free
;
1217 dev
->type
= ARPHRD_SIT
;
1218 dev
->hard_header_len
= LL_MAX_HEADER
+ sizeof(struct iphdr
);
1219 dev
->mtu
= ETH_DATA_LEN
- sizeof(struct iphdr
);
1220 dev
->flags
= IFF_NOARP
;
1221 dev
->priv_flags
&= ~IFF_XMIT_DST_RELEASE
;
1224 dev
->features
|= NETIF_F_NETNS_LOCAL
;
1225 dev
->features
|= NETIF_F_LLTX
;
1228 static int ipip6_tunnel_init(struct net_device
*dev
)
1230 struct ip_tunnel
*tunnel
= netdev_priv(dev
);
1234 memcpy(dev
->dev_addr
, &tunnel
->parms
.iph
.saddr
, 4);
1235 memcpy(dev
->broadcast
, &tunnel
->parms
.iph
.daddr
, 4);
1237 ipip6_tunnel_bind_dev(dev
);
1238 dev
->tstats
= alloc_percpu(struct pcpu_tstats
);
1245 static int __net_init
ipip6_fb_tunnel_init(struct net_device
*dev
)
1247 struct ip_tunnel
*tunnel
= netdev_priv(dev
);
1248 struct iphdr
*iph
= &tunnel
->parms
.iph
;
1249 struct net
*net
= dev_net(dev
);
1250 struct sit_net
*sitn
= net_generic(net
, sit_net_id
);
1253 strcpy(tunnel
->parms
.name
, dev
->name
);
1256 iph
->protocol
= IPPROTO_IPV6
;
1260 dev
->tstats
= alloc_percpu(struct pcpu_tstats
);
1264 rcu_assign_pointer(sitn
->tunnels_wc
[0], tunnel
);
1268 static void ipip6_netlink_parms(struct nlattr
*data
[],
1269 struct ip_tunnel_parm
*parms
)
1271 memset(parms
, 0, sizeof(*parms
));
1273 parms
->iph
.version
= 4;
1274 parms
->iph
.protocol
= IPPROTO_IPV6
;
1276 parms
->iph
.ttl
= 64;
1281 if (data
[IFLA_IPTUN_LINK
])
1282 parms
->link
= nla_get_u32(data
[IFLA_IPTUN_LINK
]);
1284 if (data
[IFLA_IPTUN_LOCAL
])
1285 parms
->iph
.saddr
= nla_get_be32(data
[IFLA_IPTUN_LOCAL
]);
1287 if (data
[IFLA_IPTUN_REMOTE
])
1288 parms
->iph
.daddr
= nla_get_be32(data
[IFLA_IPTUN_REMOTE
]);
1290 if (data
[IFLA_IPTUN_TTL
]) {
1291 parms
->iph
.ttl
= nla_get_u8(data
[IFLA_IPTUN_TTL
]);
1293 parms
->iph
.frag_off
= htons(IP_DF
);
1296 if (data
[IFLA_IPTUN_TOS
])
1297 parms
->iph
.tos
= nla_get_u8(data
[IFLA_IPTUN_TOS
]);
1299 if (!data
[IFLA_IPTUN_PMTUDISC
] || nla_get_u8(data
[IFLA_IPTUN_PMTUDISC
]))
1300 parms
->iph
.frag_off
= htons(IP_DF
);
1302 if (data
[IFLA_IPTUN_FLAGS
])
1303 parms
->i_flags
= nla_get_be16(data
[IFLA_IPTUN_FLAGS
]);
1306 #ifdef CONFIG_IPV6_SIT_6RD
1307 /* This function returns true when 6RD attributes are present in the nl msg */
1308 static bool ipip6_netlink_6rd_parms(struct nlattr
*data
[],
1309 struct ip_tunnel_6rd
*ip6rd
)
1312 memset(ip6rd
, 0, sizeof(*ip6rd
));
1317 if (data
[IFLA_IPTUN_6RD_PREFIX
]) {
1319 nla_memcpy(&ip6rd
->prefix
, data
[IFLA_IPTUN_6RD_PREFIX
],
1320 sizeof(struct in6_addr
));
1323 if (data
[IFLA_IPTUN_6RD_RELAY_PREFIX
]) {
1325 ip6rd
->relay_prefix
=
1326 nla_get_be32(data
[IFLA_IPTUN_6RD_RELAY_PREFIX
]);
1329 if (data
[IFLA_IPTUN_6RD_PREFIXLEN
]) {
1331 ip6rd
->prefixlen
= nla_get_u16(data
[IFLA_IPTUN_6RD_PREFIXLEN
]);
1334 if (data
[IFLA_IPTUN_6RD_RELAY_PREFIXLEN
]) {
1336 ip6rd
->relay_prefixlen
=
1337 nla_get_u16(data
[IFLA_IPTUN_6RD_RELAY_PREFIXLEN
]);
1344 static int ipip6_newlink(struct net
*src_net
, struct net_device
*dev
,
1345 struct nlattr
*tb
[], struct nlattr
*data
[])
1347 struct net
*net
= dev_net(dev
);
1348 struct ip_tunnel
*nt
;
1349 #ifdef CONFIG_IPV6_SIT_6RD
1350 struct ip_tunnel_6rd ip6rd
;
1354 nt
= netdev_priv(dev
);
1355 ipip6_netlink_parms(data
, &nt
->parms
);
1357 if (ipip6_tunnel_locate(net
, &nt
->parms
, 0))
1360 err
= ipip6_tunnel_create(dev
);
1364 #ifdef CONFIG_IPV6_SIT_6RD
1365 if (ipip6_netlink_6rd_parms(data
, &ip6rd
))
1366 err
= ipip6_tunnel_update_6rd(nt
, &ip6rd
);
1372 static int ipip6_changelink(struct net_device
*dev
, struct nlattr
*tb
[],
1373 struct nlattr
*data
[])
1375 struct ip_tunnel
*t
;
1376 struct ip_tunnel_parm p
;
1377 struct net
*net
= dev_net(dev
);
1378 struct sit_net
*sitn
= net_generic(net
, sit_net_id
);
1379 #ifdef CONFIG_IPV6_SIT_6RD
1380 struct ip_tunnel_6rd ip6rd
;
1383 if (dev
== sitn
->fb_tunnel_dev
)
1386 ipip6_netlink_parms(data
, &p
);
1388 if (((dev
->flags
& IFF_POINTOPOINT
) && !p
.iph
.daddr
) ||
1389 (!(dev
->flags
& IFF_POINTOPOINT
) && p
.iph
.daddr
))
1392 t
= ipip6_tunnel_locate(net
, &p
, 0);
1398 t
= netdev_priv(dev
);
1400 ipip6_tunnel_update(t
, &p
);
1402 #ifdef CONFIG_IPV6_SIT_6RD
1403 if (ipip6_netlink_6rd_parms(data
, &ip6rd
))
1404 return ipip6_tunnel_update_6rd(t
, &ip6rd
);
1410 static size_t ipip6_get_size(const struct net_device
*dev
)
1413 /* IFLA_IPTUN_LINK */
1415 /* IFLA_IPTUN_LOCAL */
1417 /* IFLA_IPTUN_REMOTE */
1419 /* IFLA_IPTUN_TTL */
1421 /* IFLA_IPTUN_TOS */
1423 /* IFLA_IPTUN_PMTUDISC */
1425 /* IFLA_IPTUN_FLAGS */
1427 #ifdef CONFIG_IPV6_SIT_6RD
1428 /* IFLA_IPTUN_6RD_PREFIX */
1429 nla_total_size(sizeof(struct in6_addr
)) +
1430 /* IFLA_IPTUN_6RD_RELAY_PREFIX */
1432 /* IFLA_IPTUN_6RD_PREFIXLEN */
1434 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */
1440 static int ipip6_fill_info(struct sk_buff
*skb
, const struct net_device
*dev
)
1442 struct ip_tunnel
*tunnel
= netdev_priv(dev
);
1443 struct ip_tunnel_parm
*parm
= &tunnel
->parms
;
1445 if (nla_put_u32(skb
, IFLA_IPTUN_LINK
, parm
->link
) ||
1446 nla_put_be32(skb
, IFLA_IPTUN_LOCAL
, parm
->iph
.saddr
) ||
1447 nla_put_be32(skb
, IFLA_IPTUN_REMOTE
, parm
->iph
.daddr
) ||
1448 nla_put_u8(skb
, IFLA_IPTUN_TTL
, parm
->iph
.ttl
) ||
1449 nla_put_u8(skb
, IFLA_IPTUN_TOS
, parm
->iph
.tos
) ||
1450 nla_put_u8(skb
, IFLA_IPTUN_PMTUDISC
,
1451 !!(parm
->iph
.frag_off
& htons(IP_DF
))) ||
1452 nla_put_be16(skb
, IFLA_IPTUN_FLAGS
, parm
->i_flags
))
1453 goto nla_put_failure
;
1455 #ifdef CONFIG_IPV6_SIT_6RD
1456 if (nla_put(skb
, IFLA_IPTUN_6RD_PREFIX
, sizeof(struct in6_addr
),
1457 &tunnel
->ip6rd
.prefix
) ||
1458 nla_put_be32(skb
, IFLA_IPTUN_6RD_RELAY_PREFIX
,
1459 tunnel
->ip6rd
.relay_prefix
) ||
1460 nla_put_u16(skb
, IFLA_IPTUN_6RD_PREFIXLEN
,
1461 tunnel
->ip6rd
.prefixlen
) ||
1462 nla_put_u16(skb
, IFLA_IPTUN_6RD_RELAY_PREFIXLEN
,
1463 tunnel
->ip6rd
.relay_prefixlen
))
1464 goto nla_put_failure
;
1473 static const struct nla_policy ipip6_policy
[IFLA_IPTUN_MAX
+ 1] = {
1474 [IFLA_IPTUN_LINK
] = { .type
= NLA_U32
},
1475 [IFLA_IPTUN_LOCAL
] = { .type
= NLA_U32
},
1476 [IFLA_IPTUN_REMOTE
] = { .type
= NLA_U32
},
1477 [IFLA_IPTUN_TTL
] = { .type
= NLA_U8
},
1478 [IFLA_IPTUN_TOS
] = { .type
= NLA_U8
},
1479 [IFLA_IPTUN_PMTUDISC
] = { .type
= NLA_U8
},
1480 [IFLA_IPTUN_FLAGS
] = { .type
= NLA_U16
},
1481 #ifdef CONFIG_IPV6_SIT_6RD
1482 [IFLA_IPTUN_6RD_PREFIX
] = { .len
= sizeof(struct in6_addr
) },
1483 [IFLA_IPTUN_6RD_RELAY_PREFIX
] = { .type
= NLA_U32
},
1484 [IFLA_IPTUN_6RD_PREFIXLEN
] = { .type
= NLA_U16
},
1485 [IFLA_IPTUN_6RD_RELAY_PREFIXLEN
] = { .type
= NLA_U16
},
1489 static struct rtnl_link_ops sit_link_ops __read_mostly
= {
1491 .maxtype
= IFLA_IPTUN_MAX
,
1492 .policy
= ipip6_policy
,
1493 .priv_size
= sizeof(struct ip_tunnel
),
1494 .setup
= ipip6_tunnel_setup
,
1495 .newlink
= ipip6_newlink
,
1496 .changelink
= ipip6_changelink
,
1497 .get_size
= ipip6_get_size
,
1498 .fill_info
= ipip6_fill_info
,
1501 static struct xfrm_tunnel sit_handler __read_mostly
= {
1502 .handler
= ipip6_rcv
,
1503 .err_handler
= ipip6_err
,
1507 static void __net_exit
sit_destroy_tunnels(struct sit_net
*sitn
, struct list_head
*head
)
1511 for (prio
= 1; prio
< 4; prio
++) {
1513 for (h
= 0; h
< HASH_SIZE
; h
++) {
1514 struct ip_tunnel
*t
;
1516 t
= rtnl_dereference(sitn
->tunnels
[prio
][h
]);
1518 unregister_netdevice_queue(t
->dev
, head
);
1519 t
= rtnl_dereference(t
->next
);
1525 static int __net_init
sit_init_net(struct net
*net
)
1527 struct sit_net
*sitn
= net_generic(net
, sit_net_id
);
1528 struct ip_tunnel
*t
;
1531 sitn
->tunnels
[0] = sitn
->tunnels_wc
;
1532 sitn
->tunnels
[1] = sitn
->tunnels_l
;
1533 sitn
->tunnels
[2] = sitn
->tunnels_r
;
1534 sitn
->tunnels
[3] = sitn
->tunnels_r_l
;
1536 sitn
->fb_tunnel_dev
= alloc_netdev(sizeof(struct ip_tunnel
), "sit0",
1537 ipip6_tunnel_setup
);
1538 if (!sitn
->fb_tunnel_dev
) {
1542 dev_net_set(sitn
->fb_tunnel_dev
, net
);
1544 err
= ipip6_fb_tunnel_init(sitn
->fb_tunnel_dev
);
1548 ipip6_tunnel_clone_6rd(sitn
->fb_tunnel_dev
, sitn
);
1550 if ((err
= register_netdev(sitn
->fb_tunnel_dev
)))
1553 t
= netdev_priv(sitn
->fb_tunnel_dev
);
1555 strcpy(t
->parms
.name
, sitn
->fb_tunnel_dev
->name
);
1559 dev_put(sitn
->fb_tunnel_dev
);
1561 ipip6_dev_free(sitn
->fb_tunnel_dev
);
1566 static void __net_exit
sit_exit_net(struct net
*net
)
1568 struct sit_net
*sitn
= net_generic(net
, sit_net_id
);
1572 sit_destroy_tunnels(sitn
, &list
);
1573 unregister_netdevice_queue(sitn
->fb_tunnel_dev
, &list
);
1574 unregister_netdevice_many(&list
);
1578 static struct pernet_operations sit_net_ops
= {
1579 .init
= sit_init_net
,
1580 .exit
= sit_exit_net
,
1582 .size
= sizeof(struct sit_net
),
1585 static void __exit
sit_cleanup(void)
1587 rtnl_link_unregister(&sit_link_ops
);
1588 xfrm4_tunnel_deregister(&sit_handler
, AF_INET6
);
1590 unregister_pernet_device(&sit_net_ops
);
1591 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1594 static int __init
sit_init(void)
1598 pr_info("IPv6 over IPv4 tunneling driver\n");
1600 err
= register_pernet_device(&sit_net_ops
);
1603 err
= xfrm4_tunnel_register(&sit_handler
, AF_INET6
);
1605 pr_info("%s: can't add protocol\n", __func__
);
1606 goto xfrm_tunnel_failed
;
1608 err
= rtnl_link_register(&sit_link_ops
);
1610 goto rtnl_link_failed
;
1616 xfrm4_tunnel_deregister(&sit_handler
, AF_INET6
);
1618 unregister_pernet_device(&sit_net_ops
);
1622 module_init(sit_init
);
1623 module_exit(sit_cleanup
);
1624 MODULE_LICENSE("GPL");
1625 MODULE_ALIAS_NETDEV("sit0");