2 * IPv6 virtual tunneling interface
4 * Copyright (C) 2013 secunet Security Networks AG
7 * Steffen Klassert <steffen.klassert@secunet.com>
10 * net/ipv6/ip6_tunnel.c
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
18 #include <linux/module.h>
19 #include <linux/capability.h>
20 #include <linux/errno.h>
21 #include <linux/types.h>
22 #include <linux/sockios.h>
23 #include <linux/icmp.h>
27 #include <linux/net.h>
28 #include <linux/in6.h>
29 #include <linux/netdevice.h>
30 #include <linux/if_arp.h>
31 #include <linux/icmpv6.h>
32 #include <linux/init.h>
33 #include <linux/route.h>
34 #include <linux/rtnetlink.h>
35 #include <linux/netfilter_ipv6.h>
36 #include <linux/slab.h>
37 #include <linux/hash.h>
39 #include <linux/uaccess.h>
40 #include <linux/atomic.h>
44 #include <net/ip_tunnels.h>
46 #include <net/ip6_route.h>
47 #include <net/addrconf.h>
48 #include <net/ip6_tunnel.h>
50 #include <net/net_namespace.h>
51 #include <net/netns/generic.h>
53 #define HASH_SIZE_SHIFT 5
54 #define HASH_SIZE (1 << HASH_SIZE_SHIFT)
56 static u32
HASH(const struct in6_addr
*addr1
, const struct in6_addr
*addr2
)
58 u32 hash
= ipv6_addr_hash(addr1
) ^ ipv6_addr_hash(addr2
);
60 return hash_32(hash
, HASH_SIZE_SHIFT
);
63 static int vti6_dev_init(struct net_device
*dev
);
64 static void vti6_dev_setup(struct net_device
*dev
);
65 static struct rtnl_link_ops vti6_link_ops __read_mostly
;
67 static int vti6_net_id __read_mostly
;
69 /* the vti6 tunnel fallback device */
70 struct net_device
*fb_tnl_dev
;
71 /* lists for storing tunnels in use */
72 struct ip6_tnl __rcu
*tnls_r_l
[HASH_SIZE
];
73 struct ip6_tnl __rcu
*tnls_wc
[1];
74 struct ip6_tnl __rcu
**tnls
[2];
77 #define for_each_vti6_tunnel_rcu(start) \
78 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
81 * vti6_tnl_lookup - fetch tunnel matching the end-point addresses
82 * @net: network namespace
83 * @remote: the address of the tunnel exit-point
84 * @local: the address of the tunnel entry-point
87 * tunnel matching given end-points if found,
88 * else fallback tunnel if its device is up,
91 static struct ip6_tnl
*
92 vti6_tnl_lookup(struct net
*net
, const struct in6_addr
*remote
,
93 const struct in6_addr
*local
)
95 unsigned int hash
= HASH(remote
, local
);
97 struct vti6_net
*ip6n
= net_generic(net
, vti6_net_id
);
99 for_each_vti6_tunnel_rcu(ip6n
->tnls_r_l
[hash
]) {
100 if (ipv6_addr_equal(local
, &t
->parms
.laddr
) &&
101 ipv6_addr_equal(remote
, &t
->parms
.raddr
) &&
102 (t
->dev
->flags
& IFF_UP
))
105 t
= rcu_dereference(ip6n
->tnls_wc
[0]);
106 if (t
&& (t
->dev
->flags
& IFF_UP
))
113 * vti6_tnl_bucket - get head of list matching given tunnel parameters
114 * @p: parameters containing tunnel end-points
117 * vti6_tnl_bucket() returns the head of the list matching the
118 * &struct in6_addr entries laddr and raddr in @p.
120 * Return: head of IPv6 tunnel list
122 static struct ip6_tnl __rcu
**
123 vti6_tnl_bucket(struct vti6_net
*ip6n
, const struct __ip6_tnl_parm
*p
)
125 const struct in6_addr
*remote
= &p
->raddr
;
126 const struct in6_addr
*local
= &p
->laddr
;
130 if (!ipv6_addr_any(remote
) || !ipv6_addr_any(local
)) {
132 h
= HASH(remote
, local
);
134 return &ip6n
->tnls
[prio
][h
];
138 vti6_tnl_link(struct vti6_net
*ip6n
, struct ip6_tnl
*t
)
140 struct ip6_tnl __rcu
**tp
= vti6_tnl_bucket(ip6n
, &t
->parms
);
142 rcu_assign_pointer(t
->next
, rtnl_dereference(*tp
));
143 rcu_assign_pointer(*tp
, t
);
147 vti6_tnl_unlink(struct vti6_net
*ip6n
, struct ip6_tnl
*t
)
149 struct ip6_tnl __rcu
**tp
;
150 struct ip6_tnl
*iter
;
152 for (tp
= vti6_tnl_bucket(ip6n
, &t
->parms
);
153 (iter
= rtnl_dereference(*tp
)) != NULL
;
156 rcu_assign_pointer(*tp
, t
->next
);
162 static void vti6_dev_free(struct net_device
*dev
)
164 free_percpu(dev
->tstats
);
168 static int vti6_tnl_create2(struct net_device
*dev
)
170 struct ip6_tnl
*t
= netdev_priv(dev
);
171 struct net
*net
= dev_net(dev
);
172 struct vti6_net
*ip6n
= net_generic(net
, vti6_net_id
);
175 err
= register_netdevice(dev
);
179 strcpy(t
->parms
.name
, dev
->name
);
180 dev
->rtnl_link_ops
= &vti6_link_ops
;
183 vti6_tnl_link(ip6n
, t
);
191 static struct ip6_tnl
*vti6_tnl_create(struct net
*net
, struct __ip6_tnl_parm
*p
)
193 struct net_device
*dev
;
199 strlcpy(name
, p
->name
, IFNAMSIZ
);
201 sprintf(name
, "ip6_vti%%d");
203 dev
= alloc_netdev(sizeof(*t
), name
, NET_NAME_UNKNOWN
, vti6_dev_setup
);
207 dev_net_set(dev
, net
);
209 t
= netdev_priv(dev
);
211 t
->net
= dev_net(dev
);
213 err
= vti6_tnl_create2(dev
);
226 * vti6_locate - find or create tunnel matching given parameters
227 * @net: network namespace
228 * @p: tunnel parameters
229 * @create: != 0 if allowed to create new tunnel if no match found
232 * vti6_locate() first tries to locate an existing tunnel
233 * based on @parms. If this is unsuccessful, but @create is set a new
234 * tunnel device is created and registered for use.
237 * matching tunnel or NULL
239 static struct ip6_tnl
*vti6_locate(struct net
*net
, struct __ip6_tnl_parm
*p
,
242 const struct in6_addr
*remote
= &p
->raddr
;
243 const struct in6_addr
*local
= &p
->laddr
;
244 struct ip6_tnl __rcu
**tp
;
246 struct vti6_net
*ip6n
= net_generic(net
, vti6_net_id
);
248 for (tp
= vti6_tnl_bucket(ip6n
, p
);
249 (t
= rtnl_dereference(*tp
)) != NULL
;
251 if (ipv6_addr_equal(local
, &t
->parms
.laddr
) &&
252 ipv6_addr_equal(remote
, &t
->parms
.raddr
)) {
261 return vti6_tnl_create(net
, p
);
265 * vti6_dev_uninit - tunnel device uninitializer
266 * @dev: the device to be destroyed
269 * vti6_dev_uninit() removes tunnel from its list
271 static void vti6_dev_uninit(struct net_device
*dev
)
273 struct ip6_tnl
*t
= netdev_priv(dev
);
274 struct net
*net
= dev_net(dev
);
275 struct vti6_net
*ip6n
= net_generic(net
, vti6_net_id
);
277 if (dev
== ip6n
->fb_tnl_dev
)
278 RCU_INIT_POINTER(ip6n
->tnls_wc
[0], NULL
);
280 vti6_tnl_unlink(ip6n
, t
);
284 static int vti6_rcv(struct sk_buff
*skb
)
287 const struct ipv6hdr
*ipv6h
= ipv6_hdr(skb
);
290 t
= vti6_tnl_lookup(dev_net(skb
->dev
), &ipv6h
->saddr
, &ipv6h
->daddr
);
292 if (t
->parms
.proto
!= IPPROTO_IPV6
&& t
->parms
.proto
!= 0) {
297 if (!xfrm6_policy_check(NULL
, XFRM_POLICY_IN
, skb
)) {
302 if (!ip6_tnl_rcv_ctl(t
, &ipv6h
->daddr
, &ipv6h
->saddr
)) {
303 t
->dev
->stats
.rx_dropped
++;
308 XFRM_TUNNEL_SKB_CB(skb
)->tunnel
.ip6
= t
;
309 skb
->mark
= be32_to_cpu(t
->parms
.i_key
);
313 return xfrm6_rcv(skb
);
322 static int vti6_rcv_cb(struct sk_buff
*skb
, int err
)
324 unsigned short family
;
325 struct net_device
*dev
;
326 struct pcpu_sw_netstats
*tstats
;
327 struct xfrm_state
*x
;
328 struct ip6_tnl
*t
= XFRM_TUNNEL_SKB_CB(skb
)->tunnel
.ip6
;
336 dev
->stats
.rx_errors
++;
337 dev
->stats
.rx_dropped
++;
342 x
= xfrm_input_state(skb
);
343 family
= x
->inner_mode
->afinfo
->family
;
345 if (!xfrm_policy_check(NULL
, XFRM_POLICY_IN
, skb
, family
))
348 skb_scrub_packet(skb
, !net_eq(t
->net
, dev_net(skb
->dev
)));
351 tstats
= this_cpu_ptr(dev
->tstats
);
352 u64_stats_update_begin(&tstats
->syncp
);
353 tstats
->rx_packets
++;
354 tstats
->rx_bytes
+= skb
->len
;
355 u64_stats_update_end(&tstats
->syncp
);
361 * vti6_addr_conflict - compare packet addresses to tunnel's own
362 * @t: the outgoing tunnel device
363 * @hdr: IPv6 header from the incoming packet
366 * Avoid trivial tunneling loop by checking that tunnel exit-point
367 * doesn't match source of incoming packet.
374 vti6_addr_conflict(const struct ip6_tnl
*t
, const struct ipv6hdr
*hdr
)
376 return ipv6_addr_equal(&t
->parms
.raddr
, &hdr
->saddr
);
379 static bool vti6_state_check(const struct xfrm_state
*x
,
380 const struct in6_addr
*dst
,
381 const struct in6_addr
*src
)
383 xfrm_address_t
*daddr
= (xfrm_address_t
*)dst
;
384 xfrm_address_t
*saddr
= (xfrm_address_t
*)src
;
386 /* if there is no transform then this tunnel is not functional.
387 * Or if the xfrm is not mode tunnel.
389 if (!x
|| x
->props
.mode
!= XFRM_MODE_TUNNEL
||
390 x
->props
.family
!= AF_INET6
)
393 if (ipv6_addr_any(dst
))
394 return xfrm_addr_equal(saddr
, &x
->props
.saddr
, AF_INET6
);
396 if (!xfrm_state_addr_check(x
, daddr
, saddr
, AF_INET6
))
403 * vti6_xmit - send a packet
404 * @skb: the outgoing socket buffer
405 * @dev: the outgoing tunnel device
406 * @fl: the flow informations for the xfrm_lookup
409 vti6_xmit(struct sk_buff
*skb
, struct net_device
*dev
, struct flowi
*fl
)
411 struct ip6_tnl
*t
= netdev_priv(dev
);
412 struct net_device_stats
*stats
= &t
->dev
->stats
;
413 struct dst_entry
*dst
= skb_dst(skb
);
414 struct net_device
*tdev
;
415 struct xfrm_state
*x
;
419 goto tx_err_link_failure
;
422 dst
= xfrm_lookup(t
->net
, dst
, fl
, NULL
, 0);
426 goto tx_err_link_failure
;
430 if (!vti6_state_check(x
, &t
->parms
.raddr
, &t
->parms
.laddr
))
431 goto tx_err_link_failure
;
433 if (!ip6_tnl_xmit_ctl(t
, (const struct in6_addr
*)&x
->props
.saddr
,
434 (const struct in6_addr
*)&x
->id
.daddr
))
435 goto tx_err_link_failure
;
441 net_warn_ratelimited("%s: Local routing loop detected!\n",
443 goto tx_err_dst_release
;
446 skb_scrub_packet(skb
, !net_eq(t
->net
, dev_net(dev
)));
447 skb_dst_set(skb
, dst
);
448 skb
->dev
= skb_dst(skb
)->dev
;
450 err
= dst_output(skb
);
451 if (net_xmit_eval(err
) == 0) {
452 struct pcpu_sw_netstats
*tstats
= this_cpu_ptr(dev
->tstats
);
454 u64_stats_update_begin(&tstats
->syncp
);
455 tstats
->tx_bytes
+= skb
->len
;
456 tstats
->tx_packets
++;
457 u64_stats_update_end(&tstats
->syncp
);
460 stats
->tx_aborted_errors
++;
465 stats
->tx_carrier_errors
++;
466 dst_link_failure(skb
);
473 vti6_tnl_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
475 struct ip6_tnl
*t
= netdev_priv(dev
);
476 struct net_device_stats
*stats
= &t
->dev
->stats
;
477 struct ipv6hdr
*ipv6h
;
481 memset(&fl
, 0, sizeof(fl
));
482 skb
->mark
= be32_to_cpu(t
->parms
.o_key
);
484 switch (skb
->protocol
) {
485 case htons(ETH_P_IPV6
):
486 ipv6h
= ipv6_hdr(skb
);
488 if ((t
->parms
.proto
!= IPPROTO_IPV6
&& t
->parms
.proto
!= 0) ||
489 vti6_addr_conflict(t
, ipv6h
))
492 xfrm_decode_session(skb
, &fl
, AF_INET6
);
493 memset(IP6CB(skb
), 0, sizeof(*IP6CB(skb
)));
495 case htons(ETH_P_IP
):
496 xfrm_decode_session(skb
, &fl
, AF_INET
);
497 memset(IPCB(skb
), 0, sizeof(*IPCB(skb
)));
503 ret
= vti6_xmit(skb
, dev
, &fl
);
516 static int vti6_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
517 u8 type
, u8 code
, int offset
, __be32 info
)
521 struct xfrm_state
*x
;
523 struct ip_esp_hdr
*esph
;
524 struct ip_auth_hdr
*ah
;
525 struct ip_comp_hdr
*ipch
;
526 struct net
*net
= dev_net(skb
->dev
);
527 const struct ipv6hdr
*iph
= (const struct ipv6hdr
*)skb
->data
;
528 int protocol
= iph
->nexthdr
;
530 t
= vti6_tnl_lookup(dev_net(skb
->dev
), &iph
->daddr
, &iph
->saddr
);
534 mark
= be32_to_cpu(t
->parms
.o_key
);
538 esph
= (struct ip_esp_hdr
*)(skb
->data
+ offset
);
542 ah
= (struct ip_auth_hdr
*)(skb
->data
+ offset
);
546 ipch
= (struct ip_comp_hdr
*)(skb
->data
+ offset
);
547 spi
= htonl(ntohs(ipch
->cpi
));
553 if (type
!= ICMPV6_PKT_TOOBIG
&&
554 type
!= NDISC_REDIRECT
)
557 x
= xfrm_state_lookup(net
, mark
, (const xfrm_address_t
*)&iph
->daddr
,
558 spi
, protocol
, AF_INET6
);
562 if (type
== NDISC_REDIRECT
)
563 ip6_redirect(skb
, net
, skb
->dev
->ifindex
, 0);
565 ip6_update_pmtu(skb
, net
, info
, 0, 0);
571 static void vti6_link_config(struct ip6_tnl
*t
)
573 struct net_device
*dev
= t
->dev
;
574 struct __ip6_tnl_parm
*p
= &t
->parms
;
576 memcpy(dev
->dev_addr
, &p
->laddr
, sizeof(struct in6_addr
));
577 memcpy(dev
->broadcast
, &p
->raddr
, sizeof(struct in6_addr
));
579 p
->flags
&= ~(IP6_TNL_F_CAP_XMIT
| IP6_TNL_F_CAP_RCV
|
580 IP6_TNL_F_CAP_PER_PACKET
);
581 p
->flags
|= ip6_tnl_get_cap(t
, &p
->laddr
, &p
->raddr
);
583 if (p
->flags
& IP6_TNL_F_CAP_XMIT
&& p
->flags
& IP6_TNL_F_CAP_RCV
)
584 dev
->flags
|= IFF_POINTOPOINT
;
586 dev
->flags
&= ~IFF_POINTOPOINT
;
588 dev
->iflink
= p
->link
;
592 * vti6_tnl_change - update the tunnel parameters
593 * @t: tunnel to be changed
594 * @p: tunnel configuration parameters
597 * vti6_tnl_change() updates the tunnel parameters
600 vti6_tnl_change(struct ip6_tnl
*t
, const struct __ip6_tnl_parm
*p
)
602 t
->parms
.laddr
= p
->laddr
;
603 t
->parms
.raddr
= p
->raddr
;
604 t
->parms
.link
= p
->link
;
605 t
->parms
.i_key
= p
->i_key
;
606 t
->parms
.o_key
= p
->o_key
;
607 t
->parms
.proto
= p
->proto
;
608 ip6_tnl_dst_reset(t
);
613 static int vti6_update(struct ip6_tnl
*t
, struct __ip6_tnl_parm
*p
)
615 struct net
*net
= dev_net(t
->dev
);
616 struct vti6_net
*ip6n
= net_generic(net
, vti6_net_id
);
619 vti6_tnl_unlink(ip6n
, t
);
621 err
= vti6_tnl_change(t
, p
);
622 vti6_tnl_link(ip6n
, t
);
623 netdev_state_change(t
->dev
);
628 vti6_parm_from_user(struct __ip6_tnl_parm
*p
, const struct ip6_tnl_parm2
*u
)
637 memcpy(p
->name
, u
->name
, sizeof(u
->name
));
641 vti6_parm_to_user(struct ip6_tnl_parm2
*u
, const struct __ip6_tnl_parm
*p
)
650 memcpy(u
->name
, p
->name
, sizeof(u
->name
));
654 * vti6_tnl_ioctl - configure vti6 tunnels from userspace
655 * @dev: virtual device associated with tunnel
656 * @ifr: parameters passed from userspace
657 * @cmd: command to be performed
660 * vti6_ioctl() is used for managing vti6 tunnels
663 * The possible commands are the following:
664 * %SIOCGETTUNNEL: get tunnel parameters for device
665 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
666 * %SIOCCHGTUNNEL: change tunnel parameters to those given
667 * %SIOCDELTUNNEL: delete tunnel
669 * The fallback device "ip6_vti0", created during module
670 * initialization, can be used for creating other tunnel devices.
674 * %-EFAULT if unable to copy data to or from userspace,
675 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
676 * %-EINVAL if passed tunnel parameters are invalid,
677 * %-EEXIST if changing a tunnel's parameters would cause a conflict
678 * %-ENODEV if attempting to change or delete a nonexisting device
681 vti6_ioctl(struct net_device
*dev
, struct ifreq
*ifr
, int cmd
)
684 struct ip6_tnl_parm2 p
;
685 struct __ip6_tnl_parm p1
;
686 struct ip6_tnl
*t
= NULL
;
687 struct net
*net
= dev_net(dev
);
688 struct vti6_net
*ip6n
= net_generic(net
, vti6_net_id
);
692 if (dev
== ip6n
->fb_tnl_dev
) {
693 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
))) {
697 vti6_parm_from_user(&p1
, &p
);
698 t
= vti6_locate(net
, &p1
, 0);
700 memset(&p
, 0, sizeof(p
));
703 t
= netdev_priv(dev
);
704 vti6_parm_to_user(&p
, &t
->parms
);
705 if (copy_to_user(ifr
->ifr_ifru
.ifru_data
, &p
, sizeof(p
)))
711 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
714 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
)))
717 if (p
.proto
!= IPPROTO_IPV6
&& p
.proto
!= 0)
719 vti6_parm_from_user(&p1
, &p
);
720 t
= vti6_locate(net
, &p1
, cmd
== SIOCADDTUNNEL
);
721 if (dev
!= ip6n
->fb_tnl_dev
&& cmd
== SIOCCHGTUNNEL
) {
728 t
= netdev_priv(dev
);
730 err
= vti6_update(t
, &p1
);
734 vti6_parm_to_user(&p
, &t
->parms
);
735 if (copy_to_user(ifr
->ifr_ifru
.ifru_data
, &p
, sizeof(p
)))
739 err
= (cmd
== SIOCADDTUNNEL
? -ENOBUFS
: -ENOENT
);
743 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
746 if (dev
== ip6n
->fb_tnl_dev
) {
748 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
)))
751 vti6_parm_from_user(&p1
, &p
);
752 t
= vti6_locate(net
, &p1
, 0);
756 if (t
->dev
== ip6n
->fb_tnl_dev
)
761 unregister_netdevice(dev
);
770 * vti6_tnl_change_mtu - change mtu manually for tunnel device
771 * @dev: virtual device associated with tunnel
772 * @new_mtu: the new mtu
776 * %-EINVAL if mtu too small
778 static int vti6_change_mtu(struct net_device
*dev
, int new_mtu
)
780 if (new_mtu
< IPV6_MIN_MTU
)
787 static const struct net_device_ops vti6_netdev_ops
= {
788 .ndo_init
= vti6_dev_init
,
789 .ndo_uninit
= vti6_dev_uninit
,
790 .ndo_start_xmit
= vti6_tnl_xmit
,
791 .ndo_do_ioctl
= vti6_ioctl
,
792 .ndo_change_mtu
= vti6_change_mtu
,
793 .ndo_get_stats64
= ip_tunnel_get_stats64
,
797 * vti6_dev_setup - setup virtual tunnel device
798 * @dev: virtual device associated with tunnel
801 * Initialize function pointers and device parameters
803 static void vti6_dev_setup(struct net_device
*dev
)
805 dev
->netdev_ops
= &vti6_netdev_ops
;
806 dev
->destructor
= vti6_dev_free
;
808 dev
->type
= ARPHRD_TUNNEL6
;
809 dev
->hard_header_len
= LL_MAX_HEADER
+ sizeof(struct ipv6hdr
);
810 dev
->mtu
= ETH_DATA_LEN
;
811 dev
->flags
|= IFF_NOARP
;
812 dev
->addr_len
= sizeof(struct in6_addr
);
817 * vti6_dev_init_gen - general initializer for all tunnel devices
818 * @dev: virtual device associated with tunnel
820 static inline int vti6_dev_init_gen(struct net_device
*dev
)
822 struct ip6_tnl
*t
= netdev_priv(dev
);
825 t
->net
= dev_net(dev
);
826 dev
->tstats
= netdev_alloc_pcpu_stats(struct pcpu_sw_netstats
);
833 * vti6_dev_init - initializer for all non fallback tunnel devices
834 * @dev: virtual device associated with tunnel
836 static int vti6_dev_init(struct net_device
*dev
)
838 struct ip6_tnl
*t
= netdev_priv(dev
);
839 int err
= vti6_dev_init_gen(dev
);
848 * vti6_fb_tnl_dev_init - initializer for fallback tunnel device
849 * @dev: fallback device
853 static int __net_init
vti6_fb_tnl_dev_init(struct net_device
*dev
)
855 struct ip6_tnl
*t
= netdev_priv(dev
);
856 struct net
*net
= dev_net(dev
);
857 struct vti6_net
*ip6n
= net_generic(net
, vti6_net_id
);
859 t
->parms
.proto
= IPPROTO_IPV6
;
862 rcu_assign_pointer(ip6n
->tnls_wc
[0], t
);
866 static int vti6_validate(struct nlattr
*tb
[], struct nlattr
*data
[])
871 static void vti6_netlink_parms(struct nlattr
*data
[],
872 struct __ip6_tnl_parm
*parms
)
874 memset(parms
, 0, sizeof(*parms
));
879 if (data
[IFLA_VTI_LINK
])
880 parms
->link
= nla_get_u32(data
[IFLA_VTI_LINK
]);
882 if (data
[IFLA_VTI_LOCAL
])
883 nla_memcpy(&parms
->laddr
, data
[IFLA_VTI_LOCAL
],
884 sizeof(struct in6_addr
));
886 if (data
[IFLA_VTI_REMOTE
])
887 nla_memcpy(&parms
->raddr
, data
[IFLA_VTI_REMOTE
],
888 sizeof(struct in6_addr
));
890 if (data
[IFLA_VTI_IKEY
])
891 parms
->i_key
= nla_get_be32(data
[IFLA_VTI_IKEY
]);
893 if (data
[IFLA_VTI_OKEY
])
894 parms
->o_key
= nla_get_be32(data
[IFLA_VTI_OKEY
]);
897 static int vti6_newlink(struct net
*src_net
, struct net_device
*dev
,
898 struct nlattr
*tb
[], struct nlattr
*data
[])
900 struct net
*net
= dev_net(dev
);
903 nt
= netdev_priv(dev
);
904 vti6_netlink_parms(data
, &nt
->parms
);
906 nt
->parms
.proto
= IPPROTO_IPV6
;
908 if (vti6_locate(net
, &nt
->parms
, 0))
911 return vti6_tnl_create2(dev
);
914 static int vti6_changelink(struct net_device
*dev
, struct nlattr
*tb
[],
915 struct nlattr
*data
[])
918 struct __ip6_tnl_parm p
;
919 struct net
*net
= dev_net(dev
);
920 struct vti6_net
*ip6n
= net_generic(net
, vti6_net_id
);
922 if (dev
== ip6n
->fb_tnl_dev
)
925 vti6_netlink_parms(data
, &p
);
927 t
= vti6_locate(net
, &p
, 0);
933 t
= netdev_priv(dev
);
935 return vti6_update(t
, &p
);
938 static size_t vti6_get_size(const struct net_device
*dev
)
944 nla_total_size(sizeof(struct in6_addr
)) +
945 /* IFLA_VTI_REMOTE */
946 nla_total_size(sizeof(struct in6_addr
)) +
954 static int vti6_fill_info(struct sk_buff
*skb
, const struct net_device
*dev
)
956 struct ip6_tnl
*tunnel
= netdev_priv(dev
);
957 struct __ip6_tnl_parm
*parm
= &tunnel
->parms
;
959 if (nla_put_u32(skb
, IFLA_VTI_LINK
, parm
->link
) ||
960 nla_put(skb
, IFLA_VTI_LOCAL
, sizeof(struct in6_addr
),
962 nla_put(skb
, IFLA_VTI_REMOTE
, sizeof(struct in6_addr
),
964 nla_put_be32(skb
, IFLA_VTI_IKEY
, parm
->i_key
) ||
965 nla_put_be32(skb
, IFLA_VTI_OKEY
, parm
->o_key
))
966 goto nla_put_failure
;
973 static const struct nla_policy vti6_policy
[IFLA_VTI_MAX
+ 1] = {
974 [IFLA_VTI_LINK
] = { .type
= NLA_U32
},
975 [IFLA_VTI_LOCAL
] = { .len
= sizeof(struct in6_addr
) },
976 [IFLA_VTI_REMOTE
] = { .len
= sizeof(struct in6_addr
) },
977 [IFLA_VTI_IKEY
] = { .type
= NLA_U32
},
978 [IFLA_VTI_OKEY
] = { .type
= NLA_U32
},
981 static struct rtnl_link_ops vti6_link_ops __read_mostly
= {
983 .maxtype
= IFLA_VTI_MAX
,
984 .policy
= vti6_policy
,
985 .priv_size
= sizeof(struct ip6_tnl
),
986 .setup
= vti6_dev_setup
,
987 .validate
= vti6_validate
,
988 .newlink
= vti6_newlink
,
989 .changelink
= vti6_changelink
,
990 .get_size
= vti6_get_size
,
991 .fill_info
= vti6_fill_info
,
994 static void __net_exit
vti6_destroy_tunnels(struct vti6_net
*ip6n
)
1000 for (h
= 0; h
< HASH_SIZE
; h
++) {
1001 t
= rtnl_dereference(ip6n
->tnls_r_l
[h
]);
1003 unregister_netdevice_queue(t
->dev
, &list
);
1004 t
= rtnl_dereference(t
->next
);
1008 t
= rtnl_dereference(ip6n
->tnls_wc
[0]);
1009 unregister_netdevice_queue(t
->dev
, &list
);
1010 unregister_netdevice_many(&list
);
1013 static int __net_init
vti6_init_net(struct net
*net
)
1015 struct vti6_net
*ip6n
= net_generic(net
, vti6_net_id
);
1016 struct ip6_tnl
*t
= NULL
;
1019 ip6n
->tnls
[0] = ip6n
->tnls_wc
;
1020 ip6n
->tnls
[1] = ip6n
->tnls_r_l
;
1023 ip6n
->fb_tnl_dev
= alloc_netdev(sizeof(struct ip6_tnl
), "ip6_vti0",
1024 NET_NAME_UNKNOWN
, vti6_dev_setup
);
1026 if (!ip6n
->fb_tnl_dev
)
1028 dev_net_set(ip6n
->fb_tnl_dev
, net
);
1030 err
= vti6_fb_tnl_dev_init(ip6n
->fb_tnl_dev
);
1034 err
= register_netdev(ip6n
->fb_tnl_dev
);
1038 t
= netdev_priv(ip6n
->fb_tnl_dev
);
1040 strcpy(t
->parms
.name
, ip6n
->fb_tnl_dev
->name
);
1044 vti6_dev_free(ip6n
->fb_tnl_dev
);
1049 static void __net_exit
vti6_exit_net(struct net
*net
)
1051 struct vti6_net
*ip6n
= net_generic(net
, vti6_net_id
);
1054 vti6_destroy_tunnels(ip6n
);
1058 static struct pernet_operations vti6_net_ops
= {
1059 .init
= vti6_init_net
,
1060 .exit
= vti6_exit_net
,
1062 .size
= sizeof(struct vti6_net
),
1065 static struct xfrm6_protocol vti_esp6_protocol __read_mostly
= {
1066 .handler
= vti6_rcv
,
1067 .cb_handler
= vti6_rcv_cb
,
1068 .err_handler
= vti6_err
,
1072 static struct xfrm6_protocol vti_ah6_protocol __read_mostly
= {
1073 .handler
= vti6_rcv
,
1074 .cb_handler
= vti6_rcv_cb
,
1075 .err_handler
= vti6_err
,
1079 static struct xfrm6_protocol vti_ipcomp6_protocol __read_mostly
= {
1080 .handler
= vti6_rcv
,
1081 .cb_handler
= vti6_rcv_cb
,
1082 .err_handler
= vti6_err
,
1087 * vti6_tunnel_init - register protocol and reserve needed resources
1089 * Return: 0 on success
1091 static int __init
vti6_tunnel_init(void)
1096 msg
= "tunnel device";
1097 err
= register_pernet_device(&vti6_net_ops
);
1099 goto pernet_dev_failed
;
1101 msg
= "tunnel protocols";
1102 err
= xfrm6_protocol_register(&vti_esp6_protocol
, IPPROTO_ESP
);
1104 goto xfrm_proto_esp_failed
;
1105 err
= xfrm6_protocol_register(&vti_ah6_protocol
, IPPROTO_AH
);
1107 goto xfrm_proto_ah_failed
;
1108 err
= xfrm6_protocol_register(&vti_ipcomp6_protocol
, IPPROTO_COMP
);
1110 goto xfrm_proto_comp_failed
;
1112 msg
= "netlink interface";
1113 err
= rtnl_link_register(&vti6_link_ops
);
1115 goto rtnl_link_failed
;
1120 xfrm6_protocol_deregister(&vti_ipcomp6_protocol
, IPPROTO_COMP
);
1121 xfrm_proto_comp_failed
:
1122 xfrm6_protocol_deregister(&vti_ah6_protocol
, IPPROTO_AH
);
1123 xfrm_proto_ah_failed
:
1124 xfrm6_protocol_deregister(&vti_esp6_protocol
, IPPROTO_ESP
);
1125 xfrm_proto_esp_failed
:
1126 unregister_pernet_device(&vti6_net_ops
);
1128 pr_err("vti6 init: failed to register %s\n", msg
);
1133 * vti6_tunnel_cleanup - free resources and unregister protocol
1135 static void __exit
vti6_tunnel_cleanup(void)
1137 rtnl_link_unregister(&vti6_link_ops
);
1138 xfrm6_protocol_deregister(&vti_ipcomp6_protocol
, IPPROTO_COMP
);
1139 xfrm6_protocol_deregister(&vti_ah6_protocol
, IPPROTO_AH
);
1140 xfrm6_protocol_deregister(&vti_esp6_protocol
, IPPROTO_ESP
);
1141 unregister_pernet_device(&vti6_net_ops
);
1144 module_init(vti6_tunnel_init
);
1145 module_exit(vti6_tunnel_cleanup
);
1146 MODULE_LICENSE("GPL");
1147 MODULE_ALIAS_RTNL_LINK("vti6");
1148 MODULE_ALIAS_NETDEV("ip6_vti0");
1149 MODULE_AUTHOR("Steffen Klassert");
1150 MODULE_DESCRIPTION("IPv6 virtual tunnel interface");