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
);
100 for_each_vti6_tunnel_rcu(ip6n
->tnls_r_l
[hash
]) {
101 if (ipv6_addr_equal(local
, &t
->parms
.laddr
) &&
102 ipv6_addr_equal(remote
, &t
->parms
.raddr
) &&
103 (t
->dev
->flags
& IFF_UP
))
107 memset(&any
, 0, sizeof(any
));
108 hash
= HASH(&any
, local
);
109 for_each_vti6_tunnel_rcu(ip6n
->tnls_r_l
[hash
]) {
110 if (ipv6_addr_equal(local
, &t
->parms
.laddr
) &&
111 (t
->dev
->flags
& IFF_UP
))
115 hash
= HASH(remote
, &any
);
116 for_each_vti6_tunnel_rcu(ip6n
->tnls_r_l
[hash
]) {
117 if (ipv6_addr_equal(remote
, &t
->parms
.raddr
) &&
118 (t
->dev
->flags
& IFF_UP
))
122 t
= rcu_dereference(ip6n
->tnls_wc
[0]);
123 if (t
&& (t
->dev
->flags
& IFF_UP
))
130 * vti6_tnl_bucket - get head of list matching given tunnel parameters
131 * @p: parameters containing tunnel end-points
134 * vti6_tnl_bucket() returns the head of the list matching the
135 * &struct in6_addr entries laddr and raddr in @p.
137 * Return: head of IPv6 tunnel list
139 static struct ip6_tnl __rcu
**
140 vti6_tnl_bucket(struct vti6_net
*ip6n
, const struct __ip6_tnl_parm
*p
)
142 const struct in6_addr
*remote
= &p
->raddr
;
143 const struct in6_addr
*local
= &p
->laddr
;
147 if (!ipv6_addr_any(remote
) || !ipv6_addr_any(local
)) {
149 h
= HASH(remote
, local
);
151 return &ip6n
->tnls
[prio
][h
];
155 vti6_tnl_link(struct vti6_net
*ip6n
, struct ip6_tnl
*t
)
157 struct ip6_tnl __rcu
**tp
= vti6_tnl_bucket(ip6n
, &t
->parms
);
159 rcu_assign_pointer(t
->next
, rtnl_dereference(*tp
));
160 rcu_assign_pointer(*tp
, t
);
164 vti6_tnl_unlink(struct vti6_net
*ip6n
, struct ip6_tnl
*t
)
166 struct ip6_tnl __rcu
**tp
;
167 struct ip6_tnl
*iter
;
169 for (tp
= vti6_tnl_bucket(ip6n
, &t
->parms
);
170 (iter
= rtnl_dereference(*tp
)) != NULL
;
173 rcu_assign_pointer(*tp
, t
->next
);
179 static void vti6_dev_free(struct net_device
*dev
)
181 free_percpu(dev
->tstats
);
185 static int vti6_tnl_create2(struct net_device
*dev
)
187 struct ip6_tnl
*t
= netdev_priv(dev
);
188 struct net
*net
= dev_net(dev
);
189 struct vti6_net
*ip6n
= net_generic(net
, vti6_net_id
);
192 err
= register_netdevice(dev
);
196 strcpy(t
->parms
.name
, dev
->name
);
197 dev
->rtnl_link_ops
= &vti6_link_ops
;
200 vti6_tnl_link(ip6n
, t
);
208 static struct ip6_tnl
*vti6_tnl_create(struct net
*net
, struct __ip6_tnl_parm
*p
)
210 struct net_device
*dev
;
216 strlcpy(name
, p
->name
, IFNAMSIZ
);
218 sprintf(name
, "ip6_vti%%d");
220 dev
= alloc_netdev(sizeof(*t
), name
, NET_NAME_UNKNOWN
, vti6_dev_setup
);
224 dev_net_set(dev
, net
);
226 t
= netdev_priv(dev
);
228 t
->net
= dev_net(dev
);
230 err
= vti6_tnl_create2(dev
);
243 * vti6_locate - find or create tunnel matching given parameters
244 * @net: network namespace
245 * @p: tunnel parameters
246 * @create: != 0 if allowed to create new tunnel if no match found
249 * vti6_locate() first tries to locate an existing tunnel
250 * based on @parms. If this is unsuccessful, but @create is set a new
251 * tunnel device is created and registered for use.
254 * matching tunnel or NULL
256 static struct ip6_tnl
*vti6_locate(struct net
*net
, struct __ip6_tnl_parm
*p
,
259 const struct in6_addr
*remote
= &p
->raddr
;
260 const struct in6_addr
*local
= &p
->laddr
;
261 struct ip6_tnl __rcu
**tp
;
263 struct vti6_net
*ip6n
= net_generic(net
, vti6_net_id
);
265 for (tp
= vti6_tnl_bucket(ip6n
, p
);
266 (t
= rtnl_dereference(*tp
)) != NULL
;
268 if (ipv6_addr_equal(local
, &t
->parms
.laddr
) &&
269 ipv6_addr_equal(remote
, &t
->parms
.raddr
)) {
278 return vti6_tnl_create(net
, p
);
282 * vti6_dev_uninit - tunnel device uninitializer
283 * @dev: the device to be destroyed
286 * vti6_dev_uninit() removes tunnel from its list
288 static void vti6_dev_uninit(struct net_device
*dev
)
290 struct ip6_tnl
*t
= netdev_priv(dev
);
291 struct net
*net
= dev_net(dev
);
292 struct vti6_net
*ip6n
= net_generic(net
, vti6_net_id
);
294 if (dev
== ip6n
->fb_tnl_dev
)
295 RCU_INIT_POINTER(ip6n
->tnls_wc
[0], NULL
);
297 vti6_tnl_unlink(ip6n
, t
);
301 static int vti6_rcv(struct sk_buff
*skb
)
304 const struct ipv6hdr
*ipv6h
= ipv6_hdr(skb
);
307 t
= vti6_tnl_lookup(dev_net(skb
->dev
), &ipv6h
->saddr
, &ipv6h
->daddr
);
309 if (t
->parms
.proto
!= IPPROTO_IPV6
&& t
->parms
.proto
!= 0) {
314 if (!xfrm6_policy_check(NULL
, XFRM_POLICY_IN
, skb
)) {
319 if (!ip6_tnl_rcv_ctl(t
, &ipv6h
->daddr
, &ipv6h
->saddr
)) {
320 t
->dev
->stats
.rx_dropped
++;
325 XFRM_TUNNEL_SKB_CB(skb
)->tunnel
.ip6
= t
;
326 skb
->mark
= be32_to_cpu(t
->parms
.i_key
);
330 return xfrm6_rcv(skb
);
339 static int vti6_rcv_cb(struct sk_buff
*skb
, int err
)
341 unsigned short family
;
342 struct net_device
*dev
;
343 struct pcpu_sw_netstats
*tstats
;
344 struct xfrm_state
*x
;
345 struct ip6_tnl
*t
= XFRM_TUNNEL_SKB_CB(skb
)->tunnel
.ip6
;
353 dev
->stats
.rx_errors
++;
354 dev
->stats
.rx_dropped
++;
359 x
= xfrm_input_state(skb
);
360 family
= x
->inner_mode
->afinfo
->family
;
362 if (!xfrm_policy_check(NULL
, XFRM_POLICY_IN
, skb
, family
))
365 skb_scrub_packet(skb
, !net_eq(t
->net
, dev_net(skb
->dev
)));
368 tstats
= this_cpu_ptr(dev
->tstats
);
369 u64_stats_update_begin(&tstats
->syncp
);
370 tstats
->rx_packets
++;
371 tstats
->rx_bytes
+= skb
->len
;
372 u64_stats_update_end(&tstats
->syncp
);
378 * vti6_addr_conflict - compare packet addresses to tunnel's own
379 * @t: the outgoing tunnel device
380 * @hdr: IPv6 header from the incoming packet
383 * Avoid trivial tunneling loop by checking that tunnel exit-point
384 * doesn't match source of incoming packet.
391 vti6_addr_conflict(const struct ip6_tnl
*t
, const struct ipv6hdr
*hdr
)
393 return ipv6_addr_equal(&t
->parms
.raddr
, &hdr
->saddr
);
396 static bool vti6_state_check(const struct xfrm_state
*x
,
397 const struct in6_addr
*dst
,
398 const struct in6_addr
*src
)
400 xfrm_address_t
*daddr
= (xfrm_address_t
*)dst
;
401 xfrm_address_t
*saddr
= (xfrm_address_t
*)src
;
403 /* if there is no transform then this tunnel is not functional.
404 * Or if the xfrm is not mode tunnel.
406 if (!x
|| x
->props
.mode
!= XFRM_MODE_TUNNEL
||
407 x
->props
.family
!= AF_INET6
)
410 if (ipv6_addr_any(dst
))
411 return xfrm_addr_equal(saddr
, &x
->props
.saddr
, AF_INET6
);
413 if (!xfrm_state_addr_check(x
, daddr
, saddr
, AF_INET6
))
420 * vti6_xmit - send a packet
421 * @skb: the outgoing socket buffer
422 * @dev: the outgoing tunnel device
423 * @fl: the flow informations for the xfrm_lookup
426 vti6_xmit(struct sk_buff
*skb
, struct net_device
*dev
, struct flowi
*fl
)
428 struct ip6_tnl
*t
= netdev_priv(dev
);
429 struct net_device_stats
*stats
= &t
->dev
->stats
;
430 struct dst_entry
*dst
= skb_dst(skb
);
431 struct net_device
*tdev
;
432 struct xfrm_state
*x
;
436 goto tx_err_link_failure
;
439 dst
= xfrm_lookup(t
->net
, dst
, fl
, NULL
, 0);
443 goto tx_err_link_failure
;
447 if (!vti6_state_check(x
, &t
->parms
.raddr
, &t
->parms
.laddr
))
448 goto tx_err_link_failure
;
450 if (!ip6_tnl_xmit_ctl(t
, (const struct in6_addr
*)&x
->props
.saddr
,
451 (const struct in6_addr
*)&x
->id
.daddr
))
452 goto tx_err_link_failure
;
458 net_warn_ratelimited("%s: Local routing loop detected!\n",
460 goto tx_err_dst_release
;
463 skb_scrub_packet(skb
, !net_eq(t
->net
, dev_net(dev
)));
464 skb_dst_set(skb
, dst
);
465 skb
->dev
= skb_dst(skb
)->dev
;
467 err
= dst_output(skb
);
468 if (net_xmit_eval(err
) == 0) {
469 struct pcpu_sw_netstats
*tstats
= this_cpu_ptr(dev
->tstats
);
471 u64_stats_update_begin(&tstats
->syncp
);
472 tstats
->tx_bytes
+= skb
->len
;
473 tstats
->tx_packets
++;
474 u64_stats_update_end(&tstats
->syncp
);
477 stats
->tx_aborted_errors
++;
482 stats
->tx_carrier_errors
++;
483 dst_link_failure(skb
);
490 vti6_tnl_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
492 struct ip6_tnl
*t
= netdev_priv(dev
);
493 struct net_device_stats
*stats
= &t
->dev
->stats
;
494 struct ipv6hdr
*ipv6h
;
498 memset(&fl
, 0, sizeof(fl
));
499 skb
->mark
= be32_to_cpu(t
->parms
.o_key
);
501 switch (skb
->protocol
) {
502 case htons(ETH_P_IPV6
):
503 ipv6h
= ipv6_hdr(skb
);
505 if ((t
->parms
.proto
!= IPPROTO_IPV6
&& t
->parms
.proto
!= 0) ||
506 vti6_addr_conflict(t
, ipv6h
))
509 xfrm_decode_session(skb
, &fl
, AF_INET6
);
510 memset(IP6CB(skb
), 0, sizeof(*IP6CB(skb
)));
512 case htons(ETH_P_IP
):
513 xfrm_decode_session(skb
, &fl
, AF_INET
);
514 memset(IPCB(skb
), 0, sizeof(*IPCB(skb
)));
520 ret
= vti6_xmit(skb
, dev
, &fl
);
533 static int vti6_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
534 u8 type
, u8 code
, int offset
, __be32 info
)
538 struct xfrm_state
*x
;
540 struct ip_esp_hdr
*esph
;
541 struct ip_auth_hdr
*ah
;
542 struct ip_comp_hdr
*ipch
;
543 struct net
*net
= dev_net(skb
->dev
);
544 const struct ipv6hdr
*iph
= (const struct ipv6hdr
*)skb
->data
;
545 int protocol
= iph
->nexthdr
;
547 t
= vti6_tnl_lookup(dev_net(skb
->dev
), &iph
->daddr
, &iph
->saddr
);
551 mark
= be32_to_cpu(t
->parms
.o_key
);
555 esph
= (struct ip_esp_hdr
*)(skb
->data
+ offset
);
559 ah
= (struct ip_auth_hdr
*)(skb
->data
+ offset
);
563 ipch
= (struct ip_comp_hdr
*)(skb
->data
+ offset
);
564 spi
= htonl(ntohs(ipch
->cpi
));
570 if (type
!= ICMPV6_PKT_TOOBIG
&&
571 type
!= NDISC_REDIRECT
)
574 x
= xfrm_state_lookup(net
, mark
, (const xfrm_address_t
*)&iph
->daddr
,
575 spi
, protocol
, AF_INET6
);
579 if (type
== NDISC_REDIRECT
)
580 ip6_redirect(skb
, net
, skb
->dev
->ifindex
, 0);
582 ip6_update_pmtu(skb
, net
, info
, 0, 0);
588 static void vti6_link_config(struct ip6_tnl
*t
)
590 struct net_device
*dev
= t
->dev
;
591 struct __ip6_tnl_parm
*p
= &t
->parms
;
593 memcpy(dev
->dev_addr
, &p
->laddr
, sizeof(struct in6_addr
));
594 memcpy(dev
->broadcast
, &p
->raddr
, sizeof(struct in6_addr
));
596 p
->flags
&= ~(IP6_TNL_F_CAP_XMIT
| IP6_TNL_F_CAP_RCV
|
597 IP6_TNL_F_CAP_PER_PACKET
);
598 p
->flags
|= ip6_tnl_get_cap(t
, &p
->laddr
, &p
->raddr
);
600 if (p
->flags
& IP6_TNL_F_CAP_XMIT
&& p
->flags
& IP6_TNL_F_CAP_RCV
)
601 dev
->flags
|= IFF_POINTOPOINT
;
603 dev
->flags
&= ~IFF_POINTOPOINT
;
605 dev
->iflink
= p
->link
;
609 * vti6_tnl_change - update the tunnel parameters
610 * @t: tunnel to be changed
611 * @p: tunnel configuration parameters
614 * vti6_tnl_change() updates the tunnel parameters
617 vti6_tnl_change(struct ip6_tnl
*t
, const struct __ip6_tnl_parm
*p
)
619 t
->parms
.laddr
= p
->laddr
;
620 t
->parms
.raddr
= p
->raddr
;
621 t
->parms
.link
= p
->link
;
622 t
->parms
.i_key
= p
->i_key
;
623 t
->parms
.o_key
= p
->o_key
;
624 t
->parms
.proto
= p
->proto
;
625 ip6_tnl_dst_reset(t
);
630 static int vti6_update(struct ip6_tnl
*t
, struct __ip6_tnl_parm
*p
)
632 struct net
*net
= dev_net(t
->dev
);
633 struct vti6_net
*ip6n
= net_generic(net
, vti6_net_id
);
636 vti6_tnl_unlink(ip6n
, t
);
638 err
= vti6_tnl_change(t
, p
);
639 vti6_tnl_link(ip6n
, t
);
640 netdev_state_change(t
->dev
);
645 vti6_parm_from_user(struct __ip6_tnl_parm
*p
, const struct ip6_tnl_parm2
*u
)
654 memcpy(p
->name
, u
->name
, sizeof(u
->name
));
658 vti6_parm_to_user(struct ip6_tnl_parm2
*u
, const struct __ip6_tnl_parm
*p
)
667 memcpy(u
->name
, p
->name
, sizeof(u
->name
));
671 * vti6_tnl_ioctl - configure vti6 tunnels from userspace
672 * @dev: virtual device associated with tunnel
673 * @ifr: parameters passed from userspace
674 * @cmd: command to be performed
677 * vti6_ioctl() is used for managing vti6 tunnels
680 * The possible commands are the following:
681 * %SIOCGETTUNNEL: get tunnel parameters for device
682 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
683 * %SIOCCHGTUNNEL: change tunnel parameters to those given
684 * %SIOCDELTUNNEL: delete tunnel
686 * The fallback device "ip6_vti0", created during module
687 * initialization, can be used for creating other tunnel devices.
691 * %-EFAULT if unable to copy data to or from userspace,
692 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
693 * %-EINVAL if passed tunnel parameters are invalid,
694 * %-EEXIST if changing a tunnel's parameters would cause a conflict
695 * %-ENODEV if attempting to change or delete a nonexisting device
698 vti6_ioctl(struct net_device
*dev
, struct ifreq
*ifr
, int cmd
)
701 struct ip6_tnl_parm2 p
;
702 struct __ip6_tnl_parm p1
;
703 struct ip6_tnl
*t
= NULL
;
704 struct net
*net
= dev_net(dev
);
705 struct vti6_net
*ip6n
= net_generic(net
, vti6_net_id
);
709 if (dev
== ip6n
->fb_tnl_dev
) {
710 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
))) {
714 vti6_parm_from_user(&p1
, &p
);
715 t
= vti6_locate(net
, &p1
, 0);
717 memset(&p
, 0, sizeof(p
));
720 t
= netdev_priv(dev
);
721 vti6_parm_to_user(&p
, &t
->parms
);
722 if (copy_to_user(ifr
->ifr_ifru
.ifru_data
, &p
, sizeof(p
)))
728 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
731 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
)))
734 if (p
.proto
!= IPPROTO_IPV6
&& p
.proto
!= 0)
736 vti6_parm_from_user(&p1
, &p
);
737 t
= vti6_locate(net
, &p1
, cmd
== SIOCADDTUNNEL
);
738 if (dev
!= ip6n
->fb_tnl_dev
&& cmd
== SIOCCHGTUNNEL
) {
745 t
= netdev_priv(dev
);
747 err
= vti6_update(t
, &p1
);
751 vti6_parm_to_user(&p
, &t
->parms
);
752 if (copy_to_user(ifr
->ifr_ifru
.ifru_data
, &p
, sizeof(p
)))
756 err
= (cmd
== SIOCADDTUNNEL
? -ENOBUFS
: -ENOENT
);
760 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
763 if (dev
== ip6n
->fb_tnl_dev
) {
765 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
)))
768 vti6_parm_from_user(&p1
, &p
);
769 t
= vti6_locate(net
, &p1
, 0);
773 if (t
->dev
== ip6n
->fb_tnl_dev
)
778 unregister_netdevice(dev
);
787 * vti6_tnl_change_mtu - change mtu manually for tunnel device
788 * @dev: virtual device associated with tunnel
789 * @new_mtu: the new mtu
793 * %-EINVAL if mtu too small
795 static int vti6_change_mtu(struct net_device
*dev
, int new_mtu
)
797 if (new_mtu
< IPV6_MIN_MTU
)
804 static const struct net_device_ops vti6_netdev_ops
= {
805 .ndo_init
= vti6_dev_init
,
806 .ndo_uninit
= vti6_dev_uninit
,
807 .ndo_start_xmit
= vti6_tnl_xmit
,
808 .ndo_do_ioctl
= vti6_ioctl
,
809 .ndo_change_mtu
= vti6_change_mtu
,
810 .ndo_get_stats64
= ip_tunnel_get_stats64
,
814 * vti6_dev_setup - setup virtual tunnel device
815 * @dev: virtual device associated with tunnel
818 * Initialize function pointers and device parameters
820 static void vti6_dev_setup(struct net_device
*dev
)
822 dev
->netdev_ops
= &vti6_netdev_ops
;
823 dev
->destructor
= vti6_dev_free
;
825 dev
->type
= ARPHRD_TUNNEL6
;
826 dev
->hard_header_len
= LL_MAX_HEADER
+ sizeof(struct ipv6hdr
);
827 dev
->mtu
= ETH_DATA_LEN
;
828 dev
->flags
|= IFF_NOARP
;
829 dev
->addr_len
= sizeof(struct in6_addr
);
834 * vti6_dev_init_gen - general initializer for all tunnel devices
835 * @dev: virtual device associated with tunnel
837 static inline int vti6_dev_init_gen(struct net_device
*dev
)
839 struct ip6_tnl
*t
= netdev_priv(dev
);
842 t
->net
= dev_net(dev
);
843 dev
->tstats
= netdev_alloc_pcpu_stats(struct pcpu_sw_netstats
);
850 * vti6_dev_init - initializer for all non fallback tunnel devices
851 * @dev: virtual device associated with tunnel
853 static int vti6_dev_init(struct net_device
*dev
)
855 struct ip6_tnl
*t
= netdev_priv(dev
);
856 int err
= vti6_dev_init_gen(dev
);
865 * vti6_fb_tnl_dev_init - initializer for fallback tunnel device
866 * @dev: fallback device
870 static int __net_init
vti6_fb_tnl_dev_init(struct net_device
*dev
)
872 struct ip6_tnl
*t
= netdev_priv(dev
);
873 struct net
*net
= dev_net(dev
);
874 struct vti6_net
*ip6n
= net_generic(net
, vti6_net_id
);
876 t
->parms
.proto
= IPPROTO_IPV6
;
879 rcu_assign_pointer(ip6n
->tnls_wc
[0], t
);
883 static int vti6_validate(struct nlattr
*tb
[], struct nlattr
*data
[])
888 static void vti6_netlink_parms(struct nlattr
*data
[],
889 struct __ip6_tnl_parm
*parms
)
891 memset(parms
, 0, sizeof(*parms
));
896 if (data
[IFLA_VTI_LINK
])
897 parms
->link
= nla_get_u32(data
[IFLA_VTI_LINK
]);
899 if (data
[IFLA_VTI_LOCAL
])
900 nla_memcpy(&parms
->laddr
, data
[IFLA_VTI_LOCAL
],
901 sizeof(struct in6_addr
));
903 if (data
[IFLA_VTI_REMOTE
])
904 nla_memcpy(&parms
->raddr
, data
[IFLA_VTI_REMOTE
],
905 sizeof(struct in6_addr
));
907 if (data
[IFLA_VTI_IKEY
])
908 parms
->i_key
= nla_get_be32(data
[IFLA_VTI_IKEY
]);
910 if (data
[IFLA_VTI_OKEY
])
911 parms
->o_key
= nla_get_be32(data
[IFLA_VTI_OKEY
]);
914 static int vti6_newlink(struct net
*src_net
, struct net_device
*dev
,
915 struct nlattr
*tb
[], struct nlattr
*data
[])
917 struct net
*net
= dev_net(dev
);
920 nt
= netdev_priv(dev
);
921 vti6_netlink_parms(data
, &nt
->parms
);
923 nt
->parms
.proto
= IPPROTO_IPV6
;
925 if (vti6_locate(net
, &nt
->parms
, 0))
928 return vti6_tnl_create2(dev
);
931 static void vti6_dellink(struct net_device
*dev
, struct list_head
*head
)
933 struct net
*net
= dev_net(dev
);
934 struct vti6_net
*ip6n
= net_generic(net
, vti6_net_id
);
936 if (dev
!= ip6n
->fb_tnl_dev
)
937 unregister_netdevice_queue(dev
, head
);
940 static int vti6_changelink(struct net_device
*dev
, struct nlattr
*tb
[],
941 struct nlattr
*data
[])
944 struct __ip6_tnl_parm p
;
945 struct net
*net
= dev_net(dev
);
946 struct vti6_net
*ip6n
= net_generic(net
, vti6_net_id
);
948 if (dev
== ip6n
->fb_tnl_dev
)
951 vti6_netlink_parms(data
, &p
);
953 t
= vti6_locate(net
, &p
, 0);
959 t
= netdev_priv(dev
);
961 return vti6_update(t
, &p
);
964 static size_t vti6_get_size(const struct net_device
*dev
)
970 nla_total_size(sizeof(struct in6_addr
)) +
971 /* IFLA_VTI_REMOTE */
972 nla_total_size(sizeof(struct in6_addr
)) +
980 static int vti6_fill_info(struct sk_buff
*skb
, const struct net_device
*dev
)
982 struct ip6_tnl
*tunnel
= netdev_priv(dev
);
983 struct __ip6_tnl_parm
*parm
= &tunnel
->parms
;
985 if (nla_put_u32(skb
, IFLA_VTI_LINK
, parm
->link
) ||
986 nla_put(skb
, IFLA_VTI_LOCAL
, sizeof(struct in6_addr
),
988 nla_put(skb
, IFLA_VTI_REMOTE
, sizeof(struct in6_addr
),
990 nla_put_be32(skb
, IFLA_VTI_IKEY
, parm
->i_key
) ||
991 nla_put_be32(skb
, IFLA_VTI_OKEY
, parm
->o_key
))
992 goto nla_put_failure
;
999 static const struct nla_policy vti6_policy
[IFLA_VTI_MAX
+ 1] = {
1000 [IFLA_VTI_LINK
] = { .type
= NLA_U32
},
1001 [IFLA_VTI_LOCAL
] = { .len
= sizeof(struct in6_addr
) },
1002 [IFLA_VTI_REMOTE
] = { .len
= sizeof(struct in6_addr
) },
1003 [IFLA_VTI_IKEY
] = { .type
= NLA_U32
},
1004 [IFLA_VTI_OKEY
] = { .type
= NLA_U32
},
1007 static struct rtnl_link_ops vti6_link_ops __read_mostly
= {
1009 .maxtype
= IFLA_VTI_MAX
,
1010 .policy
= vti6_policy
,
1011 .priv_size
= sizeof(struct ip6_tnl
),
1012 .setup
= vti6_dev_setup
,
1013 .validate
= vti6_validate
,
1014 .newlink
= vti6_newlink
,
1015 .dellink
= vti6_dellink
,
1016 .changelink
= vti6_changelink
,
1017 .get_size
= vti6_get_size
,
1018 .fill_info
= vti6_fill_info
,
1021 static void __net_exit
vti6_destroy_tunnels(struct vti6_net
*ip6n
)
1027 for (h
= 0; h
< HASH_SIZE
; h
++) {
1028 t
= rtnl_dereference(ip6n
->tnls_r_l
[h
]);
1030 unregister_netdevice_queue(t
->dev
, &list
);
1031 t
= rtnl_dereference(t
->next
);
1035 t
= rtnl_dereference(ip6n
->tnls_wc
[0]);
1036 unregister_netdevice_queue(t
->dev
, &list
);
1037 unregister_netdevice_many(&list
);
1040 static int __net_init
vti6_init_net(struct net
*net
)
1042 struct vti6_net
*ip6n
= net_generic(net
, vti6_net_id
);
1043 struct ip6_tnl
*t
= NULL
;
1046 ip6n
->tnls
[0] = ip6n
->tnls_wc
;
1047 ip6n
->tnls
[1] = ip6n
->tnls_r_l
;
1050 ip6n
->fb_tnl_dev
= alloc_netdev(sizeof(struct ip6_tnl
), "ip6_vti0",
1051 NET_NAME_UNKNOWN
, vti6_dev_setup
);
1053 if (!ip6n
->fb_tnl_dev
)
1055 dev_net_set(ip6n
->fb_tnl_dev
, net
);
1056 ip6n
->fb_tnl_dev
->rtnl_link_ops
= &vti6_link_ops
;
1058 err
= vti6_fb_tnl_dev_init(ip6n
->fb_tnl_dev
);
1062 err
= register_netdev(ip6n
->fb_tnl_dev
);
1066 t
= netdev_priv(ip6n
->fb_tnl_dev
);
1068 strcpy(t
->parms
.name
, ip6n
->fb_tnl_dev
->name
);
1072 vti6_dev_free(ip6n
->fb_tnl_dev
);
1077 static void __net_exit
vti6_exit_net(struct net
*net
)
1079 struct vti6_net
*ip6n
= net_generic(net
, vti6_net_id
);
1082 vti6_destroy_tunnels(ip6n
);
1086 static struct pernet_operations vti6_net_ops
= {
1087 .init
= vti6_init_net
,
1088 .exit
= vti6_exit_net
,
1090 .size
= sizeof(struct vti6_net
),
1093 static struct xfrm6_protocol vti_esp6_protocol __read_mostly
= {
1094 .handler
= vti6_rcv
,
1095 .cb_handler
= vti6_rcv_cb
,
1096 .err_handler
= vti6_err
,
1100 static struct xfrm6_protocol vti_ah6_protocol __read_mostly
= {
1101 .handler
= vti6_rcv
,
1102 .cb_handler
= vti6_rcv_cb
,
1103 .err_handler
= vti6_err
,
1107 static struct xfrm6_protocol vti_ipcomp6_protocol __read_mostly
= {
1108 .handler
= vti6_rcv
,
1109 .cb_handler
= vti6_rcv_cb
,
1110 .err_handler
= vti6_err
,
1115 * vti6_tunnel_init - register protocol and reserve needed resources
1117 * Return: 0 on success
1119 static int __init
vti6_tunnel_init(void)
1124 msg
= "tunnel device";
1125 err
= register_pernet_device(&vti6_net_ops
);
1127 goto pernet_dev_failed
;
1129 msg
= "tunnel protocols";
1130 err
= xfrm6_protocol_register(&vti_esp6_protocol
, IPPROTO_ESP
);
1132 goto xfrm_proto_esp_failed
;
1133 err
= xfrm6_protocol_register(&vti_ah6_protocol
, IPPROTO_AH
);
1135 goto xfrm_proto_ah_failed
;
1136 err
= xfrm6_protocol_register(&vti_ipcomp6_protocol
, IPPROTO_COMP
);
1138 goto xfrm_proto_comp_failed
;
1140 msg
= "netlink interface";
1141 err
= rtnl_link_register(&vti6_link_ops
);
1143 goto rtnl_link_failed
;
1148 xfrm6_protocol_deregister(&vti_ipcomp6_protocol
, IPPROTO_COMP
);
1149 xfrm_proto_comp_failed
:
1150 xfrm6_protocol_deregister(&vti_ah6_protocol
, IPPROTO_AH
);
1151 xfrm_proto_ah_failed
:
1152 xfrm6_protocol_deregister(&vti_esp6_protocol
, IPPROTO_ESP
);
1153 xfrm_proto_esp_failed
:
1154 unregister_pernet_device(&vti6_net_ops
);
1156 pr_err("vti6 init: failed to register %s\n", msg
);
1161 * vti6_tunnel_cleanup - free resources and unregister protocol
1163 static void __exit
vti6_tunnel_cleanup(void)
1165 rtnl_link_unregister(&vti6_link_ops
);
1166 xfrm6_protocol_deregister(&vti_ipcomp6_protocol
, IPPROTO_COMP
);
1167 xfrm6_protocol_deregister(&vti_ah6_protocol
, IPPROTO_AH
);
1168 xfrm6_protocol_deregister(&vti_esp6_protocol
, IPPROTO_ESP
);
1169 unregister_pernet_device(&vti6_net_ops
);
1172 module_init(vti6_tunnel_init
);
1173 module_exit(vti6_tunnel_cleanup
);
1174 MODULE_LICENSE("GPL");
1175 MODULE_ALIAS_RTNL_LINK("vti6");
1176 MODULE_ALIAS_NETDEV("ip6_vti0");
1177 MODULE_AUTHOR("Steffen Klassert");
1178 MODULE_DESCRIPTION("IPv6 virtual tunnel interface");