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
);
71 static struct rtnl_link_ops sit_link_ops __read_mostly
;
73 static int sit_net_id __read_mostly
;
75 struct ip_tunnel __rcu
*tunnels_r_l
[HASH_SIZE
];
76 struct ip_tunnel __rcu
*tunnels_r
[HASH_SIZE
];
77 struct ip_tunnel __rcu
*tunnels_l
[HASH_SIZE
];
78 struct ip_tunnel __rcu
*tunnels_wc
[1];
79 struct ip_tunnel __rcu
**tunnels
[4];
81 struct net_device
*fb_tunnel_dev
;
84 static struct rtnl_link_stats64
*ipip6_get_stats64(struct net_device
*dev
,
85 struct rtnl_link_stats64
*tot
)
89 for_each_possible_cpu(i
) {
90 const struct pcpu_tstats
*tstats
= per_cpu_ptr(dev
->tstats
, i
);
91 u64 rx_packets
, rx_bytes
, tx_packets
, tx_bytes
;
95 start
= u64_stats_fetch_begin_bh(&tstats
->syncp
);
96 rx_packets
= tstats
->rx_packets
;
97 tx_packets
= tstats
->tx_packets
;
98 rx_bytes
= tstats
->rx_bytes
;
99 tx_bytes
= tstats
->tx_bytes
;
100 } while (u64_stats_fetch_retry_bh(&tstats
->syncp
, start
));
102 tot
->rx_packets
+= rx_packets
;
103 tot
->tx_packets
+= tx_packets
;
104 tot
->rx_bytes
+= rx_bytes
;
105 tot
->tx_bytes
+= tx_bytes
;
108 tot
->rx_errors
= dev
->stats
.rx_errors
;
109 tot
->tx_fifo_errors
= dev
->stats
.tx_fifo_errors
;
110 tot
->tx_carrier_errors
= dev
->stats
.tx_carrier_errors
;
111 tot
->tx_dropped
= dev
->stats
.tx_dropped
;
112 tot
->tx_aborted_errors
= dev
->stats
.tx_aborted_errors
;
113 tot
->tx_errors
= dev
->stats
.tx_errors
;
119 * Must be invoked with rcu_read_lock
121 static struct ip_tunnel
*ipip6_tunnel_lookup(struct net
*net
,
122 struct net_device
*dev
, __be32 remote
, __be32 local
)
124 unsigned int h0
= HASH(remote
);
125 unsigned int h1
= HASH(local
);
127 struct sit_net
*sitn
= net_generic(net
, sit_net_id
);
129 for_each_ip_tunnel_rcu(t
, sitn
->tunnels_r_l
[h0
^ h1
]) {
130 if (local
== t
->parms
.iph
.saddr
&&
131 remote
== t
->parms
.iph
.daddr
&&
132 (!dev
|| !t
->parms
.link
|| dev
->iflink
== t
->parms
.link
) &&
133 (t
->dev
->flags
& IFF_UP
))
136 for_each_ip_tunnel_rcu(t
, sitn
->tunnels_r
[h0
]) {
137 if (remote
== t
->parms
.iph
.daddr
&&
138 (!dev
|| !t
->parms
.link
|| dev
->iflink
== t
->parms
.link
) &&
139 (t
->dev
->flags
& IFF_UP
))
142 for_each_ip_tunnel_rcu(t
, sitn
->tunnels_l
[h1
]) {
143 if (local
== t
->parms
.iph
.saddr
&&
144 (!dev
|| !t
->parms
.link
|| dev
->iflink
== t
->parms
.link
) &&
145 (t
->dev
->flags
& IFF_UP
))
148 t
= rcu_dereference(sitn
->tunnels_wc
[0]);
149 if ((t
!= NULL
) && (t
->dev
->flags
& IFF_UP
))
154 static struct ip_tunnel __rcu
**__ipip6_bucket(struct sit_net
*sitn
,
155 struct ip_tunnel_parm
*parms
)
157 __be32 remote
= parms
->iph
.daddr
;
158 __be32 local
= parms
->iph
.saddr
;
170 return &sitn
->tunnels
[prio
][h
];
173 static inline struct ip_tunnel __rcu
**ipip6_bucket(struct sit_net
*sitn
,
176 return __ipip6_bucket(sitn
, &t
->parms
);
179 static void ipip6_tunnel_unlink(struct sit_net
*sitn
, struct ip_tunnel
*t
)
181 struct ip_tunnel __rcu
**tp
;
182 struct ip_tunnel
*iter
;
184 for (tp
= ipip6_bucket(sitn
, t
);
185 (iter
= rtnl_dereference(*tp
)) != NULL
;
188 rcu_assign_pointer(*tp
, t
->next
);
194 static void ipip6_tunnel_link(struct sit_net
*sitn
, struct ip_tunnel
*t
)
196 struct ip_tunnel __rcu
**tp
= ipip6_bucket(sitn
, t
);
198 rcu_assign_pointer(t
->next
, rtnl_dereference(*tp
));
199 rcu_assign_pointer(*tp
, t
);
202 static void ipip6_tunnel_clone_6rd(struct net_device
*dev
, struct sit_net
*sitn
)
204 #ifdef CONFIG_IPV6_SIT_6RD
205 struct ip_tunnel
*t
= netdev_priv(dev
);
207 if (t
->dev
== sitn
->fb_tunnel_dev
) {
208 ipv6_addr_set(&t
->ip6rd
.prefix
, htonl(0x20020000), 0, 0, 0);
209 t
->ip6rd
.relay_prefix
= 0;
210 t
->ip6rd
.prefixlen
= 16;
211 t
->ip6rd
.relay_prefixlen
= 0;
213 struct ip_tunnel
*t0
= netdev_priv(sitn
->fb_tunnel_dev
);
214 memcpy(&t
->ip6rd
, &t0
->ip6rd
, sizeof(t
->ip6rd
));
219 static int ipip6_tunnel_create(struct net_device
*dev
)
221 struct ip_tunnel
*t
= netdev_priv(dev
);
222 struct net
*net
= dev_net(dev
);
223 struct sit_net
*sitn
= net_generic(net
, sit_net_id
);
226 err
= ipip6_tunnel_init(dev
);
229 ipip6_tunnel_clone_6rd(dev
, sitn
);
231 if ((__force u16
)t
->parms
.i_flags
& SIT_ISATAP
)
232 dev
->priv_flags
|= IFF_ISATAP
;
234 err
= register_netdevice(dev
);
238 strcpy(t
->parms
.name
, dev
->name
);
239 dev
->rtnl_link_ops
= &sit_link_ops
;
243 ipip6_tunnel_link(sitn
, t
);
250 static struct ip_tunnel
*ipip6_tunnel_locate(struct net
*net
,
251 struct ip_tunnel_parm
*parms
, int create
)
253 __be32 remote
= parms
->iph
.daddr
;
254 __be32 local
= parms
->iph
.saddr
;
255 struct ip_tunnel
*t
, *nt
;
256 struct ip_tunnel __rcu
**tp
;
257 struct net_device
*dev
;
259 struct sit_net
*sitn
= net_generic(net
, sit_net_id
);
261 for (tp
= __ipip6_bucket(sitn
, parms
);
262 (t
= rtnl_dereference(*tp
)) != NULL
;
264 if (local
== t
->parms
.iph
.saddr
&&
265 remote
== t
->parms
.iph
.daddr
&&
266 parms
->link
== t
->parms
.link
) {
277 strlcpy(name
, parms
->name
, IFNAMSIZ
);
279 strcpy(name
, "sit%d");
281 dev
= alloc_netdev(sizeof(*t
), name
, ipip6_tunnel_setup
);
285 dev_net_set(dev
, net
);
287 nt
= netdev_priv(dev
);
290 if (ipip6_tunnel_create(dev
) < 0)
301 #define for_each_prl_rcu(start) \
302 for (prl = rcu_dereference(start); \
304 prl = rcu_dereference(prl->next))
306 static struct ip_tunnel_prl_entry
*
307 __ipip6_tunnel_locate_prl(struct ip_tunnel
*t
, __be32 addr
)
309 struct ip_tunnel_prl_entry
*prl
;
311 for_each_prl_rcu(t
->prl
)
312 if (prl
->addr
== addr
)
318 static int ipip6_tunnel_get_prl(struct ip_tunnel
*t
,
319 struct ip_tunnel_prl __user
*a
)
321 struct ip_tunnel_prl kprl
, *kp
;
322 struct ip_tunnel_prl_entry
*prl
;
323 unsigned int cmax
, c
= 0, ca
, len
;
326 if (copy_from_user(&kprl
, a
, sizeof(kprl
)))
328 cmax
= kprl
.datalen
/ sizeof(kprl
);
329 if (cmax
> 1 && kprl
.addr
!= htonl(INADDR_ANY
))
332 /* For simple GET or for root users,
333 * we try harder to allocate.
335 kp
= (cmax
<= 1 || capable(CAP_NET_ADMIN
)) ?
336 kcalloc(cmax
, sizeof(*kp
), GFP_KERNEL
) :
341 ca
= t
->prl_count
< cmax
? t
->prl_count
: cmax
;
344 /* We don't try hard to allocate much memory for
346 * For root users, retry allocating enough memory for
349 kp
= kcalloc(ca
, sizeof(*kp
), GFP_ATOMIC
);
357 for_each_prl_rcu(t
->prl
) {
360 if (kprl
.addr
!= htonl(INADDR_ANY
) && prl
->addr
!= kprl
.addr
)
362 kp
[c
].addr
= prl
->addr
;
363 kp
[c
].flags
= prl
->flags
;
365 if (kprl
.addr
!= htonl(INADDR_ANY
))
371 len
= sizeof(*kp
) * c
;
373 if ((len
&& copy_to_user(a
+ 1, kp
, len
)) || put_user(len
, &a
->datalen
))
382 ipip6_tunnel_add_prl(struct ip_tunnel
*t
, struct ip_tunnel_prl
*a
, int chg
)
384 struct ip_tunnel_prl_entry
*p
;
387 if (a
->addr
== htonl(INADDR_ANY
))
392 for (p
= rtnl_dereference(t
->prl
); p
; p
= rtnl_dereference(p
->next
)) {
393 if (p
->addr
== a
->addr
) {
408 p
= kzalloc(sizeof(struct ip_tunnel_prl_entry
), GFP_KERNEL
);
418 rcu_assign_pointer(t
->prl
, p
);
423 static void prl_list_destroy_rcu(struct rcu_head
*head
)
425 struct ip_tunnel_prl_entry
*p
, *n
;
427 p
= container_of(head
, struct ip_tunnel_prl_entry
, rcu_head
);
429 n
= rcu_dereference_protected(p
->next
, 1);
436 ipip6_tunnel_del_prl(struct ip_tunnel
*t
, struct ip_tunnel_prl
*a
)
438 struct ip_tunnel_prl_entry
*x
;
439 struct ip_tunnel_prl_entry __rcu
**p
;
444 if (a
&& a
->addr
!= htonl(INADDR_ANY
)) {
446 (x
= rtnl_dereference(*p
)) != NULL
;
448 if (x
->addr
== a
->addr
) {
450 kfree_rcu(x
, rcu_head
);
457 x
= rtnl_dereference(t
->prl
);
460 call_rcu(&x
->rcu_head
, prl_list_destroy_rcu
);
469 isatap_chksrc(struct sk_buff
*skb
, const struct iphdr
*iph
, struct ip_tunnel
*t
)
471 struct ip_tunnel_prl_entry
*p
;
475 p
= __ipip6_tunnel_locate_prl(t
, iph
->saddr
);
477 if (p
->flags
& PRL_DEFAULT
)
478 skb
->ndisc_nodetype
= NDISC_NODETYPE_DEFAULT
;
480 skb
->ndisc_nodetype
= NDISC_NODETYPE_NODEFAULT
;
482 const struct in6_addr
*addr6
= &ipv6_hdr(skb
)->saddr
;
484 if (ipv6_addr_is_isatap(addr6
) &&
485 (addr6
->s6_addr32
[3] == iph
->saddr
) &&
486 ipv6_chk_prefix(addr6
, t
->dev
))
487 skb
->ndisc_nodetype
= NDISC_NODETYPE_HOST
;
495 static void ipip6_tunnel_uninit(struct net_device
*dev
)
497 struct net
*net
= dev_net(dev
);
498 struct sit_net
*sitn
= net_generic(net
, sit_net_id
);
500 if (dev
== sitn
->fb_tunnel_dev
) {
501 RCU_INIT_POINTER(sitn
->tunnels_wc
[0], NULL
);
503 ipip6_tunnel_unlink(sitn
, netdev_priv(dev
));
504 ipip6_tunnel_del_prl(netdev_priv(dev
), NULL
);
510 static int ipip6_err(struct sk_buff
*skb
, u32 info
)
513 /* All the routers (except for Linux) return only
514 8 bytes of packet payload. It means, that precise relaying of
515 ICMP in the real Internet is absolutely infeasible.
517 const struct iphdr
*iph
= (const struct iphdr
*)skb
->data
;
518 const int type
= icmp_hdr(skb
)->type
;
519 const int code
= icmp_hdr(skb
)->code
;
525 case ICMP_PARAMETERPROB
:
528 case ICMP_DEST_UNREACH
:
531 case ICMP_PORT_UNREACH
:
532 /* Impossible event. */
535 /* All others are translated to HOST_UNREACH.
536 rfc2003 contains "deep thoughts" about NET_UNREACH,
537 I believe they are just ether pollution. --ANK
542 case ICMP_TIME_EXCEEDED
:
543 if (code
!= ICMP_EXC_TTL
)
552 t
= ipip6_tunnel_lookup(dev_net(skb
->dev
),
559 if (type
== ICMP_DEST_UNREACH
&& code
== ICMP_FRAG_NEEDED
) {
560 ipv4_update_pmtu(skb
, dev_net(skb
->dev
), info
,
561 t
->dev
->ifindex
, 0, IPPROTO_IPV6
, 0);
565 if (type
== ICMP_REDIRECT
) {
566 ipv4_redirect(skb
, dev_net(skb
->dev
), t
->dev
->ifindex
, 0,
572 if (t
->parms
.iph
.daddr
== 0)
576 if (t
->parms
.iph
.ttl
== 0 && type
== ICMP_TIME_EXCEEDED
)
579 if (time_before(jiffies
, t
->err_time
+ IPTUNNEL_ERR_TIMEO
))
583 t
->err_time
= jiffies
;
588 static inline void ipip6_ecn_decapsulate(const struct iphdr
*iph
, struct sk_buff
*skb
)
590 if (INET_ECN_is_ce(iph
->tos
))
591 IP6_ECN_set_ce(ipv6_hdr(skb
));
594 static int ipip6_rcv(struct sk_buff
*skb
)
596 const struct iphdr
*iph
;
597 struct ip_tunnel
*tunnel
;
599 if (!pskb_may_pull(skb
, sizeof(struct ipv6hdr
)))
604 tunnel
= ipip6_tunnel_lookup(dev_net(skb
->dev
), skb
->dev
,
605 iph
->saddr
, iph
->daddr
);
606 if (tunnel
!= NULL
) {
607 struct pcpu_tstats
*tstats
;
610 skb
->mac_header
= skb
->network_header
;
611 skb_reset_network_header(skb
);
612 IPCB(skb
)->flags
= 0;
613 skb
->protocol
= htons(ETH_P_IPV6
);
614 skb
->pkt_type
= PACKET_HOST
;
616 if ((tunnel
->dev
->priv_flags
& IFF_ISATAP
) &&
617 !isatap_chksrc(skb
, iph
, tunnel
)) {
618 tunnel
->dev
->stats
.rx_errors
++;
623 tstats
= this_cpu_ptr(tunnel
->dev
->tstats
);
624 tstats
->rx_packets
++;
625 tstats
->rx_bytes
+= skb
->len
;
627 __skb_tunnel_rx(skb
, tunnel
->dev
);
629 ipip6_ecn_decapsulate(iph
, skb
);
636 /* no tunnel matched, let upstream know, ipsec may handle it */
644 * Returns the embedded IPv4 address if the IPv6 address
645 * comes from 6rd / 6to4 (RFC 3056) addr space.
648 __be32
try_6rd(const struct in6_addr
*v6dst
, struct ip_tunnel
*tunnel
)
652 #ifdef CONFIG_IPV6_SIT_6RD
653 if (ipv6_prefix_equal(v6dst
, &tunnel
->ip6rd
.prefix
,
654 tunnel
->ip6rd
.prefixlen
)) {
655 unsigned int pbw0
, pbi0
;
659 pbw0
= tunnel
->ip6rd
.prefixlen
>> 5;
660 pbi0
= tunnel
->ip6rd
.prefixlen
& 0x1f;
662 d
= (ntohl(v6dst
->s6_addr32
[pbw0
]) << pbi0
) >>
663 tunnel
->ip6rd
.relay_prefixlen
;
665 pbi1
= pbi0
- tunnel
->ip6rd
.relay_prefixlen
;
667 d
|= ntohl(v6dst
->s6_addr32
[pbw0
+ 1]) >>
670 dst
= tunnel
->ip6rd
.relay_prefix
| htonl(d
);
673 if (v6dst
->s6_addr16
[0] == htons(0x2002)) {
674 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
675 memcpy(&dst
, &v6dst
->s6_addr16
[1], 4);
682 * This function assumes it is being called from dev_queue_xmit()
683 * and that skb is filled properly by that function.
686 static netdev_tx_t
ipip6_tunnel_xmit(struct sk_buff
*skb
,
687 struct net_device
*dev
)
689 struct ip_tunnel
*tunnel
= netdev_priv(dev
);
690 const struct iphdr
*tiph
= &tunnel
->parms
.iph
;
691 const struct ipv6hdr
*iph6
= ipv6_hdr(skb
);
692 u8 tos
= tunnel
->parms
.iph
.tos
;
693 __be16 df
= tiph
->frag_off
;
694 struct rtable
*rt
; /* Route to the other host */
695 struct net_device
*tdev
; /* Device to other host */
696 struct iphdr
*iph
; /* Our new IP header */
697 unsigned int max_headroom
; /* The extra header space needed */
698 __be32 dst
= tiph
->daddr
;
701 const struct in6_addr
*addr6
;
704 if (skb
->protocol
!= htons(ETH_P_IPV6
))
708 tos
= ipv6_get_dsfield(iph6
);
710 /* ISATAP (RFC4214) - must come before 6to4 */
711 if (dev
->priv_flags
& IFF_ISATAP
) {
712 struct neighbour
*neigh
= NULL
;
713 bool do_tx_error
= false;
716 neigh
= dst_neigh_lookup(skb_dst(skb
), &iph6
->daddr
);
719 net_dbg_ratelimited("sit: nexthop == NULL\n");
723 addr6
= (const struct in6_addr
*)&neigh
->primary_key
;
724 addr_type
= ipv6_addr_type(addr6
);
726 if ((addr_type
& IPV6_ADDR_UNICAST
) &&
727 ipv6_addr_is_isatap(addr6
))
728 dst
= addr6
->s6_addr32
[3];
732 neigh_release(neigh
);
738 dst
= try_6rd(&iph6
->daddr
, tunnel
);
741 struct neighbour
*neigh
= NULL
;
742 bool do_tx_error
= false;
745 neigh
= dst_neigh_lookup(skb_dst(skb
), &iph6
->daddr
);
748 net_dbg_ratelimited("sit: nexthop == NULL\n");
752 addr6
= (const struct in6_addr
*)&neigh
->primary_key
;
753 addr_type
= ipv6_addr_type(addr6
);
755 if (addr_type
== IPV6_ADDR_ANY
) {
756 addr6
= &ipv6_hdr(skb
)->daddr
;
757 addr_type
= ipv6_addr_type(addr6
);
760 if ((addr_type
& IPV6_ADDR_COMPATv4
) != 0)
761 dst
= addr6
->s6_addr32
[3];
765 neigh_release(neigh
);
770 rt
= ip_route_output_ports(dev_net(dev
), &fl4
, NULL
,
773 IPPROTO_IPV6
, RT_TOS(tos
),
776 dev
->stats
.tx_carrier_errors
++;
779 if (rt
->rt_type
!= RTN_UNICAST
) {
781 dev
->stats
.tx_carrier_errors
++;
788 dev
->stats
.collisions
++;
793 mtu
= dst_mtu(&rt
->dst
) - sizeof(struct iphdr
);
796 dev
->stats
.collisions
++;
801 if (mtu
< IPV6_MIN_MTU
) {
806 if (tunnel
->parms
.iph
.daddr
&& skb_dst(skb
))
807 skb_dst(skb
)->ops
->update_pmtu(skb_dst(skb
), NULL
, skb
, mtu
);
809 if (skb
->len
> mtu
) {
810 icmpv6_send(skb
, ICMPV6_PKT_TOOBIG
, 0, mtu
);
816 if (tunnel
->err_count
> 0) {
817 if (time_before(jiffies
,
818 tunnel
->err_time
+ IPTUNNEL_ERR_TIMEO
)) {
820 dst_link_failure(skb
);
822 tunnel
->err_count
= 0;
826 * Okay, now see if we can stuff it in the buffer as-is.
828 max_headroom
= LL_RESERVED_SPACE(tdev
)+sizeof(struct iphdr
);
830 if (skb_headroom(skb
) < max_headroom
|| skb_shared(skb
) ||
831 (skb_cloned(skb
) && !skb_clone_writable(skb
, 0))) {
832 struct sk_buff
*new_skb
= skb_realloc_headroom(skb
, max_headroom
);
835 dev
->stats
.tx_dropped
++;
840 skb_set_owner_w(new_skb
, skb
->sk
);
843 iph6
= ipv6_hdr(skb
);
846 skb
->transport_header
= skb
->network_header
;
847 skb_push(skb
, sizeof(struct iphdr
));
848 skb_reset_network_header(skb
);
849 memset(&(IPCB(skb
)->opt
), 0, sizeof(IPCB(skb
)->opt
));
850 IPCB(skb
)->flags
= 0;
852 skb_dst_set(skb
, &rt
->dst
);
855 * Push down and install the IPIP header.
860 iph
->ihl
= sizeof(struct iphdr
)>>2;
862 iph
->protocol
= IPPROTO_IPV6
;
863 iph
->tos
= INET_ECN_encapsulate(tos
, ipv6_get_dsfield(iph6
));
864 iph
->daddr
= fl4
.daddr
;
865 iph
->saddr
= fl4
.saddr
;
867 if ((iph
->ttl
= tiph
->ttl
) == 0)
868 iph
->ttl
= iph6
->hop_limit
;
870 iptunnel_xmit(skb
, dev
);
874 dst_link_failure(skb
);
876 dev
->stats
.tx_errors
++;
881 static void ipip6_tunnel_bind_dev(struct net_device
*dev
)
883 struct net_device
*tdev
= NULL
;
884 struct ip_tunnel
*tunnel
;
885 const struct iphdr
*iph
;
888 tunnel
= netdev_priv(dev
);
889 iph
= &tunnel
->parms
.iph
;
892 struct rtable
*rt
= ip_route_output_ports(dev_net(dev
), &fl4
, NULL
,
893 iph
->daddr
, iph
->saddr
,
903 dev
->flags
|= IFF_POINTOPOINT
;
906 if (!tdev
&& tunnel
->parms
.link
)
907 tdev
= __dev_get_by_index(dev_net(dev
), tunnel
->parms
.link
);
910 dev
->hard_header_len
= tdev
->hard_header_len
+ sizeof(struct iphdr
);
911 dev
->mtu
= tdev
->mtu
- sizeof(struct iphdr
);
912 if (dev
->mtu
< IPV6_MIN_MTU
)
913 dev
->mtu
= IPV6_MIN_MTU
;
915 dev
->iflink
= tunnel
->parms
.link
;
918 static void ipip6_tunnel_update(struct ip_tunnel
*t
, struct ip_tunnel_parm
*p
)
920 struct net
*net
= dev_net(t
->dev
);
921 struct sit_net
*sitn
= net_generic(net
, sit_net_id
);
923 ipip6_tunnel_unlink(sitn
, t
);
925 t
->parms
.iph
.saddr
= p
->iph
.saddr
;
926 t
->parms
.iph
.daddr
= p
->iph
.daddr
;
927 memcpy(t
->dev
->dev_addr
, &p
->iph
.saddr
, 4);
928 memcpy(t
->dev
->broadcast
, &p
->iph
.daddr
, 4);
929 ipip6_tunnel_link(sitn
, t
);
930 t
->parms
.iph
.ttl
= p
->iph
.ttl
;
931 t
->parms
.iph
.tos
= p
->iph
.tos
;
932 if (t
->parms
.link
!= p
->link
) {
933 t
->parms
.link
= p
->link
;
934 ipip6_tunnel_bind_dev(t
->dev
);
936 netdev_state_change(t
->dev
);
939 #ifdef CONFIG_IPV6_SIT_6RD
940 static int ipip6_tunnel_update_6rd(struct ip_tunnel
*t
,
941 struct ip_tunnel_6rd
*ip6rd
)
943 struct in6_addr prefix
;
946 if (ip6rd
->relay_prefixlen
> 32 ||
947 ip6rd
->prefixlen
+ (32 - ip6rd
->relay_prefixlen
) > 64)
950 ipv6_addr_prefix(&prefix
, &ip6rd
->prefix
, ip6rd
->prefixlen
);
951 if (!ipv6_addr_equal(&prefix
, &ip6rd
->prefix
))
953 if (ip6rd
->relay_prefixlen
)
954 relay_prefix
= ip6rd
->relay_prefix
&
955 htonl(0xffffffffUL
<<
956 (32 - ip6rd
->relay_prefixlen
));
959 if (relay_prefix
!= ip6rd
->relay_prefix
)
962 t
->ip6rd
.prefix
= prefix
;
963 t
->ip6rd
.relay_prefix
= relay_prefix
;
964 t
->ip6rd
.prefixlen
= ip6rd
->prefixlen
;
965 t
->ip6rd
.relay_prefixlen
= ip6rd
->relay_prefixlen
;
966 netdev_state_change(t
->dev
);
972 ipip6_tunnel_ioctl (struct net_device
*dev
, struct ifreq
*ifr
, int cmd
)
975 struct ip_tunnel_parm p
;
976 struct ip_tunnel_prl prl
;
978 struct net
*net
= dev_net(dev
);
979 struct sit_net
*sitn
= net_generic(net
, sit_net_id
);
980 #ifdef CONFIG_IPV6_SIT_6RD
981 struct ip_tunnel_6rd ip6rd
;
986 #ifdef CONFIG_IPV6_SIT_6RD
990 if (dev
== sitn
->fb_tunnel_dev
) {
991 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
))) {
995 t
= ipip6_tunnel_locate(net
, &p
, 0);
998 t
= netdev_priv(dev
);
1001 if (cmd
== SIOCGETTUNNEL
) {
1002 memcpy(&p
, &t
->parms
, sizeof(p
));
1003 if (copy_to_user(ifr
->ifr_ifru
.ifru_data
, &p
,
1006 #ifdef CONFIG_IPV6_SIT_6RD
1008 ip6rd
.prefix
= t
->ip6rd
.prefix
;
1009 ip6rd
.relay_prefix
= t
->ip6rd
.relay_prefix
;
1010 ip6rd
.prefixlen
= t
->ip6rd
.prefixlen
;
1011 ip6rd
.relay_prefixlen
= t
->ip6rd
.relay_prefixlen
;
1012 if (copy_to_user(ifr
->ifr_ifru
.ifru_data
, &ip6rd
,
1023 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
1027 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
)))
1031 if (p
.iph
.version
!= 4 || p
.iph
.protocol
!= IPPROTO_IPV6
||
1032 p
.iph
.ihl
!= 5 || (p
.iph
.frag_off
&htons(~IP_DF
)))
1035 p
.iph
.frag_off
|= htons(IP_DF
);
1037 t
= ipip6_tunnel_locate(net
, &p
, cmd
== SIOCADDTUNNEL
);
1039 if (dev
!= sitn
->fb_tunnel_dev
&& cmd
== SIOCCHGTUNNEL
) {
1041 if (t
->dev
!= dev
) {
1046 if (((dev
->flags
&IFF_POINTOPOINT
) && !p
.iph
.daddr
) ||
1047 (!(dev
->flags
&IFF_POINTOPOINT
) && p
.iph
.daddr
)) {
1051 t
= netdev_priv(dev
);
1054 ipip6_tunnel_update(t
, &p
);
1059 if (copy_to_user(ifr
->ifr_ifru
.ifru_data
, &t
->parms
, sizeof(p
)))
1062 err
= (cmd
== SIOCADDTUNNEL
? -ENOBUFS
: -ENOENT
);
1067 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
1070 if (dev
== sitn
->fb_tunnel_dev
) {
1072 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
)))
1075 if ((t
= ipip6_tunnel_locate(net
, &p
, 0)) == NULL
)
1078 if (t
== netdev_priv(sitn
->fb_tunnel_dev
))
1082 unregister_netdevice(dev
);
1088 if (dev
== sitn
->fb_tunnel_dev
)
1091 if (!(t
= netdev_priv(dev
)))
1093 err
= ipip6_tunnel_get_prl(t
, ifr
->ifr_ifru
.ifru_data
);
1100 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
1103 if (dev
== sitn
->fb_tunnel_dev
)
1106 if (copy_from_user(&prl
, ifr
->ifr_ifru
.ifru_data
, sizeof(prl
)))
1109 if (!(t
= netdev_priv(dev
)))
1114 err
= ipip6_tunnel_del_prl(t
, &prl
);
1118 err
= ipip6_tunnel_add_prl(t
, &prl
, cmd
== SIOCCHGPRL
);
1121 netdev_state_change(dev
);
1124 #ifdef CONFIG_IPV6_SIT_6RD
1129 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
1133 if (copy_from_user(&ip6rd
, ifr
->ifr_ifru
.ifru_data
,
1137 t
= netdev_priv(dev
);
1139 if (cmd
!= SIOCDEL6RD
) {
1140 err
= ipip6_tunnel_update_6rd(t
, &ip6rd
);
1144 ipip6_tunnel_clone_6rd(dev
, sitn
);
1158 static int ipip6_tunnel_change_mtu(struct net_device
*dev
, int new_mtu
)
1160 if (new_mtu
< IPV6_MIN_MTU
|| new_mtu
> 0xFFF8 - sizeof(struct iphdr
))
1166 static const struct net_device_ops ipip6_netdev_ops
= {
1167 .ndo_uninit
= ipip6_tunnel_uninit
,
1168 .ndo_start_xmit
= ipip6_tunnel_xmit
,
1169 .ndo_do_ioctl
= ipip6_tunnel_ioctl
,
1170 .ndo_change_mtu
= ipip6_tunnel_change_mtu
,
1171 .ndo_get_stats64
= ipip6_get_stats64
,
1174 static void ipip6_dev_free(struct net_device
*dev
)
1176 free_percpu(dev
->tstats
);
1180 static void ipip6_tunnel_setup(struct net_device
*dev
)
1182 dev
->netdev_ops
= &ipip6_netdev_ops
;
1183 dev
->destructor
= ipip6_dev_free
;
1185 dev
->type
= ARPHRD_SIT
;
1186 dev
->hard_header_len
= LL_MAX_HEADER
+ sizeof(struct iphdr
);
1187 dev
->mtu
= ETH_DATA_LEN
- sizeof(struct iphdr
);
1188 dev
->flags
= IFF_NOARP
;
1189 dev
->priv_flags
&= ~IFF_XMIT_DST_RELEASE
;
1192 dev
->features
|= NETIF_F_NETNS_LOCAL
;
1193 dev
->features
|= NETIF_F_LLTX
;
1196 static int ipip6_tunnel_init(struct net_device
*dev
)
1198 struct ip_tunnel
*tunnel
= netdev_priv(dev
);
1202 memcpy(dev
->dev_addr
, &tunnel
->parms
.iph
.saddr
, 4);
1203 memcpy(dev
->broadcast
, &tunnel
->parms
.iph
.daddr
, 4);
1205 ipip6_tunnel_bind_dev(dev
);
1206 dev
->tstats
= alloc_percpu(struct pcpu_tstats
);
1213 static int __net_init
ipip6_fb_tunnel_init(struct net_device
*dev
)
1215 struct ip_tunnel
*tunnel
= netdev_priv(dev
);
1216 struct iphdr
*iph
= &tunnel
->parms
.iph
;
1217 struct net
*net
= dev_net(dev
);
1218 struct sit_net
*sitn
= net_generic(net
, sit_net_id
);
1221 strcpy(tunnel
->parms
.name
, dev
->name
);
1224 iph
->protocol
= IPPROTO_IPV6
;
1228 dev
->tstats
= alloc_percpu(struct pcpu_tstats
);
1232 rcu_assign_pointer(sitn
->tunnels_wc
[0], tunnel
);
1236 static void ipip6_netlink_parms(struct nlattr
*data
[],
1237 struct ip_tunnel_parm
*parms
)
1239 memset(parms
, 0, sizeof(*parms
));
1241 parms
->iph
.version
= 4;
1242 parms
->iph
.protocol
= IPPROTO_IPV6
;
1244 parms
->iph
.ttl
= 64;
1249 if (data
[IFLA_IPTUN_LINK
])
1250 parms
->link
= nla_get_u32(data
[IFLA_IPTUN_LINK
]);
1252 if (data
[IFLA_IPTUN_LOCAL
])
1253 parms
->iph
.saddr
= nla_get_be32(data
[IFLA_IPTUN_LOCAL
]);
1255 if (data
[IFLA_IPTUN_REMOTE
])
1256 parms
->iph
.daddr
= nla_get_be32(data
[IFLA_IPTUN_REMOTE
]);
1258 if (data
[IFLA_IPTUN_TTL
]) {
1259 parms
->iph
.ttl
= nla_get_u8(data
[IFLA_IPTUN_TTL
]);
1261 parms
->iph
.frag_off
= htons(IP_DF
);
1264 if (data
[IFLA_IPTUN_TOS
])
1265 parms
->iph
.tos
= nla_get_u8(data
[IFLA_IPTUN_TOS
]);
1267 if (!data
[IFLA_IPTUN_PMTUDISC
] || nla_get_u8(data
[IFLA_IPTUN_PMTUDISC
]))
1268 parms
->iph
.frag_off
= htons(IP_DF
);
1270 if (data
[IFLA_IPTUN_FLAGS
])
1271 parms
->i_flags
= nla_get_be16(data
[IFLA_IPTUN_FLAGS
]);
1274 #ifdef CONFIG_IPV6_SIT_6RD
1275 /* This function returns true when 6RD attributes are present in the nl msg */
1276 static bool ipip6_netlink_6rd_parms(struct nlattr
*data
[],
1277 struct ip_tunnel_6rd
*ip6rd
)
1280 memset(ip6rd
, 0, sizeof(*ip6rd
));
1285 if (data
[IFLA_IPTUN_6RD_PREFIX
]) {
1287 nla_memcpy(&ip6rd
->prefix
, data
[IFLA_IPTUN_6RD_PREFIX
],
1288 sizeof(struct in6_addr
));
1291 if (data
[IFLA_IPTUN_6RD_RELAY_PREFIX
]) {
1293 ip6rd
->relay_prefix
=
1294 nla_get_be32(data
[IFLA_IPTUN_6RD_RELAY_PREFIX
]);
1297 if (data
[IFLA_IPTUN_6RD_PREFIXLEN
]) {
1299 ip6rd
->prefixlen
= nla_get_u16(data
[IFLA_IPTUN_6RD_PREFIXLEN
]);
1302 if (data
[IFLA_IPTUN_6RD_RELAY_PREFIXLEN
]) {
1304 ip6rd
->relay_prefixlen
=
1305 nla_get_u16(data
[IFLA_IPTUN_6RD_RELAY_PREFIXLEN
]);
1312 static int ipip6_newlink(struct net
*src_net
, struct net_device
*dev
,
1313 struct nlattr
*tb
[], struct nlattr
*data
[])
1315 struct net
*net
= dev_net(dev
);
1316 struct ip_tunnel
*nt
;
1317 #ifdef CONFIG_IPV6_SIT_6RD
1318 struct ip_tunnel_6rd ip6rd
;
1322 nt
= netdev_priv(dev
);
1323 ipip6_netlink_parms(data
, &nt
->parms
);
1325 if (ipip6_tunnel_locate(net
, &nt
->parms
, 0))
1328 err
= ipip6_tunnel_create(dev
);
1332 #ifdef CONFIG_IPV6_SIT_6RD
1333 if (ipip6_netlink_6rd_parms(data
, &ip6rd
))
1334 err
= ipip6_tunnel_update_6rd(nt
, &ip6rd
);
1340 static int ipip6_changelink(struct net_device
*dev
, struct nlattr
*tb
[],
1341 struct nlattr
*data
[])
1343 struct ip_tunnel
*t
;
1344 struct ip_tunnel_parm p
;
1345 struct net
*net
= dev_net(dev
);
1346 struct sit_net
*sitn
= net_generic(net
, sit_net_id
);
1347 #ifdef CONFIG_IPV6_SIT_6RD
1348 struct ip_tunnel_6rd ip6rd
;
1351 if (dev
== sitn
->fb_tunnel_dev
)
1354 ipip6_netlink_parms(data
, &p
);
1356 if (((dev
->flags
& IFF_POINTOPOINT
) && !p
.iph
.daddr
) ||
1357 (!(dev
->flags
& IFF_POINTOPOINT
) && p
.iph
.daddr
))
1360 t
= ipip6_tunnel_locate(net
, &p
, 0);
1366 t
= netdev_priv(dev
);
1368 ipip6_tunnel_update(t
, &p
);
1370 #ifdef CONFIG_IPV6_SIT_6RD
1371 if (ipip6_netlink_6rd_parms(data
, &ip6rd
))
1372 return ipip6_tunnel_update_6rd(t
, &ip6rd
);
1378 static size_t ipip6_get_size(const struct net_device
*dev
)
1381 /* IFLA_IPTUN_LINK */
1383 /* IFLA_IPTUN_LOCAL */
1385 /* IFLA_IPTUN_REMOTE */
1387 /* IFLA_IPTUN_TTL */
1389 /* IFLA_IPTUN_TOS */
1391 /* IFLA_IPTUN_PMTUDISC */
1393 /* IFLA_IPTUN_FLAGS */
1395 #ifdef CONFIG_IPV6_SIT_6RD
1396 /* IFLA_IPTUN_6RD_PREFIX */
1397 nla_total_size(sizeof(struct in6_addr
)) +
1398 /* IFLA_IPTUN_6RD_RELAY_PREFIX */
1400 /* IFLA_IPTUN_6RD_PREFIXLEN */
1402 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */
1408 static int ipip6_fill_info(struct sk_buff
*skb
, const struct net_device
*dev
)
1410 struct ip_tunnel
*tunnel
= netdev_priv(dev
);
1411 struct ip_tunnel_parm
*parm
= &tunnel
->parms
;
1413 if (nla_put_u32(skb
, IFLA_IPTUN_LINK
, parm
->link
) ||
1414 nla_put_be32(skb
, IFLA_IPTUN_LOCAL
, parm
->iph
.saddr
) ||
1415 nla_put_be32(skb
, IFLA_IPTUN_REMOTE
, parm
->iph
.daddr
) ||
1416 nla_put_u8(skb
, IFLA_IPTUN_TTL
, parm
->iph
.ttl
) ||
1417 nla_put_u8(skb
, IFLA_IPTUN_TOS
, parm
->iph
.tos
) ||
1418 nla_put_u8(skb
, IFLA_IPTUN_PMTUDISC
,
1419 !!(parm
->iph
.frag_off
& htons(IP_DF
))) ||
1420 nla_put_be16(skb
, IFLA_IPTUN_FLAGS
, parm
->i_flags
))
1421 goto nla_put_failure
;
1423 #ifdef CONFIG_IPV6_SIT_6RD
1424 if (nla_put(skb
, IFLA_IPTUN_6RD_PREFIX
, sizeof(struct in6_addr
),
1425 &tunnel
->ip6rd
.prefix
) ||
1426 nla_put_be32(skb
, IFLA_IPTUN_6RD_RELAY_PREFIX
,
1427 tunnel
->ip6rd
.relay_prefix
) ||
1428 nla_put_u16(skb
, IFLA_IPTUN_6RD_PREFIXLEN
,
1429 tunnel
->ip6rd
.prefixlen
) ||
1430 nla_put_u16(skb
, IFLA_IPTUN_6RD_RELAY_PREFIXLEN
,
1431 tunnel
->ip6rd
.relay_prefixlen
))
1432 goto nla_put_failure
;
1441 static const struct nla_policy ipip6_policy
[IFLA_IPTUN_MAX
+ 1] = {
1442 [IFLA_IPTUN_LINK
] = { .type
= NLA_U32
},
1443 [IFLA_IPTUN_LOCAL
] = { .type
= NLA_U32
},
1444 [IFLA_IPTUN_REMOTE
] = { .type
= NLA_U32
},
1445 [IFLA_IPTUN_TTL
] = { .type
= NLA_U8
},
1446 [IFLA_IPTUN_TOS
] = { .type
= NLA_U8
},
1447 [IFLA_IPTUN_PMTUDISC
] = { .type
= NLA_U8
},
1448 [IFLA_IPTUN_FLAGS
] = { .type
= NLA_U16
},
1449 #ifdef CONFIG_IPV6_SIT_6RD
1450 [IFLA_IPTUN_6RD_PREFIX
] = { .len
= sizeof(struct in6_addr
) },
1451 [IFLA_IPTUN_6RD_RELAY_PREFIX
] = { .type
= NLA_U32
},
1452 [IFLA_IPTUN_6RD_PREFIXLEN
] = { .type
= NLA_U16
},
1453 [IFLA_IPTUN_6RD_RELAY_PREFIXLEN
] = { .type
= NLA_U16
},
1457 static struct rtnl_link_ops sit_link_ops __read_mostly
= {
1459 .maxtype
= IFLA_IPTUN_MAX
,
1460 .policy
= ipip6_policy
,
1461 .priv_size
= sizeof(struct ip_tunnel
),
1462 .setup
= ipip6_tunnel_setup
,
1463 .newlink
= ipip6_newlink
,
1464 .changelink
= ipip6_changelink
,
1465 .get_size
= ipip6_get_size
,
1466 .fill_info
= ipip6_fill_info
,
1469 static struct xfrm_tunnel sit_handler __read_mostly
= {
1470 .handler
= ipip6_rcv
,
1471 .err_handler
= ipip6_err
,
1475 static void __net_exit
sit_destroy_tunnels(struct sit_net
*sitn
, struct list_head
*head
)
1479 for (prio
= 1; prio
< 4; prio
++) {
1481 for (h
= 0; h
< HASH_SIZE
; h
++) {
1482 struct ip_tunnel
*t
;
1484 t
= rtnl_dereference(sitn
->tunnels
[prio
][h
]);
1486 unregister_netdevice_queue(t
->dev
, head
);
1487 t
= rtnl_dereference(t
->next
);
1493 static int __net_init
sit_init_net(struct net
*net
)
1495 struct sit_net
*sitn
= net_generic(net
, sit_net_id
);
1496 struct ip_tunnel
*t
;
1499 sitn
->tunnels
[0] = sitn
->tunnels_wc
;
1500 sitn
->tunnels
[1] = sitn
->tunnels_l
;
1501 sitn
->tunnels
[2] = sitn
->tunnels_r
;
1502 sitn
->tunnels
[3] = sitn
->tunnels_r_l
;
1504 sitn
->fb_tunnel_dev
= alloc_netdev(sizeof(struct ip_tunnel
), "sit0",
1505 ipip6_tunnel_setup
);
1506 if (!sitn
->fb_tunnel_dev
) {
1510 dev_net_set(sitn
->fb_tunnel_dev
, net
);
1512 err
= ipip6_fb_tunnel_init(sitn
->fb_tunnel_dev
);
1516 ipip6_tunnel_clone_6rd(sitn
->fb_tunnel_dev
, sitn
);
1518 if ((err
= register_netdev(sitn
->fb_tunnel_dev
)))
1521 t
= netdev_priv(sitn
->fb_tunnel_dev
);
1523 strcpy(t
->parms
.name
, sitn
->fb_tunnel_dev
->name
);
1527 dev_put(sitn
->fb_tunnel_dev
);
1529 ipip6_dev_free(sitn
->fb_tunnel_dev
);
1534 static void __net_exit
sit_exit_net(struct net
*net
)
1536 struct sit_net
*sitn
= net_generic(net
, sit_net_id
);
1540 sit_destroy_tunnels(sitn
, &list
);
1541 unregister_netdevice_queue(sitn
->fb_tunnel_dev
, &list
);
1542 unregister_netdevice_many(&list
);
1546 static struct pernet_operations sit_net_ops
= {
1547 .init
= sit_init_net
,
1548 .exit
= sit_exit_net
,
1550 .size
= sizeof(struct sit_net
),
1553 static void __exit
sit_cleanup(void)
1555 rtnl_link_unregister(&sit_link_ops
);
1556 xfrm4_tunnel_deregister(&sit_handler
, AF_INET6
);
1558 unregister_pernet_device(&sit_net_ops
);
1559 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1562 static int __init
sit_init(void)
1566 pr_info("IPv6 over IPv4 tunneling driver\n");
1568 err
= register_pernet_device(&sit_net_ops
);
1571 err
= xfrm4_tunnel_register(&sit_handler
, AF_INET6
);
1573 pr_info("%s: can't add protocol\n", __func__
);
1574 goto xfrm_tunnel_failed
;
1576 err
= rtnl_link_register(&sit_link_ops
);
1578 goto rtnl_link_failed
;
1584 xfrm4_tunnel_deregister(&sit_handler
, AF_INET6
);
1586 unregister_pernet_device(&sit_net_ops
);
1590 module_init(sit_init
);
1591 module_exit(sit_cleanup
);
1592 MODULE_LICENSE("GPL");
1593 MODULE_ALIAS_NETDEV("sit0");