2 * IPv6 tunneling device
3 * Linux INET6 implementation
6 * Ville Nuorvala <vnuorval@tcs.hut.fi>
7 * Yasuyuki Kozakai <kozakai@linux-ipv6.org>
10 * linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version
17 * 2 of the License, or (at your option) any later version.
21 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
23 #include <linux/module.h>
24 #include <linux/capability.h>
25 #include <linux/errno.h>
26 #include <linux/types.h>
27 #include <linux/sockios.h>
28 #include <linux/icmp.h>
32 #include <linux/if_tunnel.h>
33 #include <linux/net.h>
34 #include <linux/in6.h>
35 #include <linux/netdevice.h>
36 #include <linux/if_arp.h>
37 #include <linux/icmpv6.h>
38 #include <linux/init.h>
39 #include <linux/route.h>
40 #include <linux/rtnetlink.h>
41 #include <linux/netfilter_ipv6.h>
42 #include <linux/slab.h>
44 #include <asm/uaccess.h>
45 #include <linux/atomic.h>
50 #include <net/ip6_route.h>
51 #include <net/addrconf.h>
52 #include <net/ip6_tunnel.h>
54 #include <net/dsfield.h>
55 #include <net/inet_ecn.h>
56 #include <net/net_namespace.h>
57 #include <net/netns/generic.h>
59 MODULE_AUTHOR("Ville Nuorvala");
60 MODULE_DESCRIPTION("IPv6 tunneling device");
61 MODULE_LICENSE("GPL");
62 MODULE_ALIAS_NETDEV("ip6tnl0");
65 #define IP6_TNL_TRACE(x...) pr_debug("%s:" x "\n", __func__)
67 #define IP6_TNL_TRACE(x...) do {;} while(0)
70 #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
71 #define IPV6_TCLASS_SHIFT 20
75 #define HASH(addr) ((__force u32)((addr)->s6_addr32[0] ^ (addr)->s6_addr32[1] ^ \
76 (addr)->s6_addr32[2] ^ (addr)->s6_addr32[3]) & \
79 static int ip6_tnl_dev_init(struct net_device
*dev
);
80 static void ip6_tnl_dev_setup(struct net_device
*dev
);
82 static int ip6_tnl_net_id __read_mostly
;
84 /* the IPv6 tunnel fallback device */
85 struct net_device
*fb_tnl_dev
;
86 /* lists for storing tunnels in use */
87 struct ip6_tnl __rcu
*tnls_r_l
[HASH_SIZE
];
88 struct ip6_tnl __rcu
*tnls_wc
[1];
89 struct ip6_tnl __rcu
**tnls
[2];
92 /* often modified stats are per cpu, other are shared (netdev->stats) */
94 unsigned long rx_packets
;
95 unsigned long rx_bytes
;
96 unsigned long tx_packets
;
97 unsigned long tx_bytes
;
98 } __attribute__((aligned(4*sizeof(unsigned long))));
100 static struct net_device_stats
*ip6_get_stats(struct net_device
*dev
)
102 struct pcpu_tstats sum
= { 0 };
105 for_each_possible_cpu(i
) {
106 const struct pcpu_tstats
*tstats
= per_cpu_ptr(dev
->tstats
, i
);
108 sum
.rx_packets
+= tstats
->rx_packets
;
109 sum
.rx_bytes
+= tstats
->rx_bytes
;
110 sum
.tx_packets
+= tstats
->tx_packets
;
111 sum
.tx_bytes
+= tstats
->tx_bytes
;
113 dev
->stats
.rx_packets
= sum
.rx_packets
;
114 dev
->stats
.rx_bytes
= sum
.rx_bytes
;
115 dev
->stats
.tx_packets
= sum
.tx_packets
;
116 dev
->stats
.tx_bytes
= sum
.tx_bytes
;
121 * Locking : hash tables are protected by RCU and RTNL
124 static inline struct dst_entry
*ip6_tnl_dst_check(struct ip6_tnl
*t
)
126 struct dst_entry
*dst
= t
->dst_cache
;
128 if (dst
&& dst
->obsolete
&&
129 dst
->ops
->check(dst
, t
->dst_cookie
) == NULL
) {
138 static inline void ip6_tnl_dst_reset(struct ip6_tnl
*t
)
140 dst_release(t
->dst_cache
);
144 static inline void ip6_tnl_dst_store(struct ip6_tnl
*t
, struct dst_entry
*dst
)
146 struct rt6_info
*rt
= (struct rt6_info
*) dst
;
147 t
->dst_cookie
= rt
->rt6i_node
? rt
->rt6i_node
->fn_sernum
: 0;
148 dst_release(t
->dst_cache
);
153 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
154 * @remote: the address of the tunnel exit-point
155 * @local: the address of the tunnel entry-point
158 * tunnel matching given end-points if found,
159 * else fallback tunnel if its device is up,
163 #define for_each_ip6_tunnel_rcu(start) \
164 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
166 static struct ip6_tnl
*
167 ip6_tnl_lookup(struct net
*net
, const struct in6_addr
*remote
, const struct in6_addr
*local
)
169 unsigned int h0
= HASH(remote
);
170 unsigned int h1
= HASH(local
);
172 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
174 for_each_ip6_tunnel_rcu(ip6n
->tnls_r_l
[h0
^ h1
]) {
175 if (ipv6_addr_equal(local
, &t
->parms
.laddr
) &&
176 ipv6_addr_equal(remote
, &t
->parms
.raddr
) &&
177 (t
->dev
->flags
& IFF_UP
))
180 t
= rcu_dereference(ip6n
->tnls_wc
[0]);
181 if (t
&& (t
->dev
->flags
& IFF_UP
))
188 * ip6_tnl_bucket - get head of list matching given tunnel parameters
189 * @p: parameters containing tunnel end-points
192 * ip6_tnl_bucket() returns the head of the list matching the
193 * &struct in6_addr entries laddr and raddr in @p.
195 * Return: head of IPv6 tunnel list
198 static struct ip6_tnl __rcu
**
199 ip6_tnl_bucket(struct ip6_tnl_net
*ip6n
, const struct ip6_tnl_parm
*p
)
201 const struct in6_addr
*remote
= &p
->raddr
;
202 const struct in6_addr
*local
= &p
->laddr
;
206 if (!ipv6_addr_any(remote
) || !ipv6_addr_any(local
)) {
208 h
= HASH(remote
) ^ HASH(local
);
210 return &ip6n
->tnls
[prio
][h
];
214 * ip6_tnl_link - add tunnel to hash table
215 * @t: tunnel to be added
219 ip6_tnl_link(struct ip6_tnl_net
*ip6n
, struct ip6_tnl
*t
)
221 struct ip6_tnl __rcu
**tp
= ip6_tnl_bucket(ip6n
, &t
->parms
);
223 rcu_assign_pointer(t
->next
, rtnl_dereference(*tp
));
224 rcu_assign_pointer(*tp
, t
);
228 * ip6_tnl_unlink - remove tunnel from hash table
229 * @t: tunnel to be removed
233 ip6_tnl_unlink(struct ip6_tnl_net
*ip6n
, struct ip6_tnl
*t
)
235 struct ip6_tnl __rcu
**tp
;
236 struct ip6_tnl
*iter
;
238 for (tp
= ip6_tnl_bucket(ip6n
, &t
->parms
);
239 (iter
= rtnl_dereference(*tp
)) != NULL
;
242 rcu_assign_pointer(*tp
, t
->next
);
248 static void ip6_dev_free(struct net_device
*dev
)
250 free_percpu(dev
->tstats
);
255 * ip6_tnl_create - create a new tunnel
256 * @p: tunnel parameters
257 * @pt: pointer to new tunnel
260 * Create tunnel matching given parameters.
263 * created tunnel or NULL
266 static struct ip6_tnl
*ip6_tnl_create(struct net
*net
, struct ip6_tnl_parm
*p
)
268 struct net_device
*dev
;
272 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
275 strlcpy(name
, p
->name
, IFNAMSIZ
);
277 sprintf(name
, "ip6tnl%%d");
279 dev
= alloc_netdev(sizeof (*t
), name
, ip6_tnl_dev_setup
);
283 dev_net_set(dev
, net
);
285 t
= netdev_priv(dev
);
287 err
= ip6_tnl_dev_init(dev
);
291 if ((err
= register_netdevice(dev
)) < 0)
294 strcpy(t
->parms
.name
, dev
->name
);
297 ip6_tnl_link(ip6n
, t
);
307 * ip6_tnl_locate - find or create tunnel matching given parameters
308 * @p: tunnel parameters
309 * @create: != 0 if allowed to create new tunnel if no match found
312 * ip6_tnl_locate() first tries to locate an existing tunnel
313 * based on @parms. If this is unsuccessful, but @create is set a new
314 * tunnel device is created and registered for use.
317 * matching tunnel or NULL
320 static struct ip6_tnl
*ip6_tnl_locate(struct net
*net
,
321 struct ip6_tnl_parm
*p
, int create
)
323 const struct in6_addr
*remote
= &p
->raddr
;
324 const struct in6_addr
*local
= &p
->laddr
;
325 struct ip6_tnl __rcu
**tp
;
327 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
329 for (tp
= ip6_tnl_bucket(ip6n
, p
);
330 (t
= rtnl_dereference(*tp
)) != NULL
;
332 if (ipv6_addr_equal(local
, &t
->parms
.laddr
) &&
333 ipv6_addr_equal(remote
, &t
->parms
.raddr
))
338 return ip6_tnl_create(net
, p
);
342 * ip6_tnl_dev_uninit - tunnel device uninitializer
343 * @dev: the device to be destroyed
346 * ip6_tnl_dev_uninit() removes tunnel from its list
350 ip6_tnl_dev_uninit(struct net_device
*dev
)
352 struct ip6_tnl
*t
= netdev_priv(dev
);
353 struct net
*net
= dev_net(dev
);
354 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
356 if (dev
== ip6n
->fb_tnl_dev
)
357 RCU_INIT_POINTER(ip6n
->tnls_wc
[0], NULL
);
359 ip6_tnl_unlink(ip6n
, t
);
360 ip6_tnl_dst_reset(t
);
365 * parse_tvl_tnl_enc_lim - handle encapsulation limit option
366 * @skb: received socket buffer
369 * 0 if none was found,
370 * else index to encapsulation limit
374 parse_tlv_tnl_enc_lim(struct sk_buff
*skb
, __u8
* raw
)
376 const struct ipv6hdr
*ipv6h
= (const struct ipv6hdr
*) raw
;
377 __u8 nexthdr
= ipv6h
->nexthdr
;
378 __u16 off
= sizeof (*ipv6h
);
380 while (ipv6_ext_hdr(nexthdr
) && nexthdr
!= NEXTHDR_NONE
) {
382 struct ipv6_opt_hdr
*hdr
;
383 if (raw
+ off
+ sizeof (*hdr
) > skb
->data
&&
384 !pskb_may_pull(skb
, raw
- skb
->data
+ off
+ sizeof (*hdr
)))
387 hdr
= (struct ipv6_opt_hdr
*) (raw
+ off
);
388 if (nexthdr
== NEXTHDR_FRAGMENT
) {
389 struct frag_hdr
*frag_hdr
= (struct frag_hdr
*) hdr
;
390 if (frag_hdr
->frag_off
)
393 } else if (nexthdr
== NEXTHDR_AUTH
) {
394 optlen
= (hdr
->hdrlen
+ 2) << 2;
396 optlen
= ipv6_optlen(hdr
);
398 if (nexthdr
== NEXTHDR_DEST
) {
401 struct ipv6_tlv_tnl_enc_lim
*tel
;
403 /* No more room for encapsulation limit */
404 if (i
+ sizeof (*tel
) > off
+ optlen
)
407 tel
= (struct ipv6_tlv_tnl_enc_lim
*) &raw
[i
];
408 /* return index of option if found and valid */
409 if (tel
->type
== IPV6_TLV_TNL_ENCAP_LIMIT
&&
412 /* else jump to next option */
414 i
+= tel
->length
+ 2;
419 nexthdr
= hdr
->nexthdr
;
426 * ip6_tnl_err - tunnel error handler
429 * ip6_tnl_err() should handle errors in the tunnel according
430 * to the specifications in RFC 2473.
434 ip6_tnl_err(struct sk_buff
*skb
, __u8 ipproto
, struct inet6_skb_parm
*opt
,
435 u8
*type
, u8
*code
, int *msg
, __u32
*info
, int offset
)
437 const struct ipv6hdr
*ipv6h
= (const struct ipv6hdr
*) skb
->data
;
440 u8 rel_type
= ICMPV6_DEST_UNREACH
;
441 u8 rel_code
= ICMPV6_ADDR_UNREACH
;
446 /* If the packet doesn't contain the original IPv6 header we are
447 in trouble since we might need the source address for further
448 processing of the error. */
451 if ((t
= ip6_tnl_lookup(dev_net(skb
->dev
), &ipv6h
->daddr
,
452 &ipv6h
->saddr
)) == NULL
)
455 if (t
->parms
.proto
!= ipproto
&& t
->parms
.proto
!= 0)
462 struct ipv6_tlv_tnl_enc_lim
*tel
;
464 case ICMPV6_DEST_UNREACH
:
465 net_warn_ratelimited("%s: Path to destination invalid or inactive!\n",
469 case ICMPV6_TIME_EXCEED
:
470 if ((*code
) == ICMPV6_EXC_HOPLIMIT
) {
471 net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
476 case ICMPV6_PARAMPROB
:
478 if ((*code
) == ICMPV6_HDR_FIELD
)
479 teli
= parse_tlv_tnl_enc_lim(skb
, skb
->data
);
481 if (teli
&& teli
== *info
- 2) {
482 tel
= (struct ipv6_tlv_tnl_enc_lim
*) &skb
->data
[teli
];
483 if (tel
->encap_limit
== 0) {
484 net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
489 net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
493 case ICMPV6_PKT_TOOBIG
:
494 mtu
= *info
- offset
;
495 if (mtu
< IPV6_MIN_MTU
)
499 if ((len
= sizeof (*ipv6h
) + ntohs(ipv6h
->payload_len
)) > mtu
) {
500 rel_type
= ICMPV6_PKT_TOOBIG
;
519 ip4ip6_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
520 u8 type
, u8 code
, int offset
, __be32 info
)
525 __u32 rel_info
= ntohl(info
);
527 struct sk_buff
*skb2
;
528 const struct iphdr
*eiph
;
532 err
= ip6_tnl_err(skb
, IPPROTO_IPIP
, opt
, &rel_type
, &rel_code
,
533 &rel_msg
, &rel_info
, offset
);
541 case ICMPV6_DEST_UNREACH
:
542 if (rel_code
!= ICMPV6_ADDR_UNREACH
)
544 rel_type
= ICMP_DEST_UNREACH
;
545 rel_code
= ICMP_HOST_UNREACH
;
547 case ICMPV6_PKT_TOOBIG
:
550 rel_type
= ICMP_DEST_UNREACH
;
551 rel_code
= ICMP_FRAG_NEEDED
;
554 rel_type
= ICMP_REDIRECT
;
555 rel_code
= ICMP_REDIR_HOST
;
560 if (!pskb_may_pull(skb
, offset
+ sizeof(struct iphdr
)))
563 skb2
= skb_clone(skb
, GFP_ATOMIC
);
569 skb_pull(skb2
, offset
);
570 skb_reset_network_header(skb2
);
573 /* Try to guess incoming interface */
574 rt
= ip_route_output_ports(dev_net(skb
->dev
), &fl4
, NULL
,
577 IPPROTO_IPIP
, RT_TOS(eiph
->tos
), 0);
581 skb2
->dev
= rt
->dst
.dev
;
583 /* route "incoming" packet */
584 if (rt
->rt_flags
& RTCF_LOCAL
) {
587 rt
= ip_route_output_ports(dev_net(skb
->dev
), &fl4
, NULL
,
588 eiph
->daddr
, eiph
->saddr
,
591 RT_TOS(eiph
->tos
), 0);
593 rt
->dst
.dev
->type
!= ARPHRD_TUNNEL
) {
598 skb_dst_set(skb2
, &rt
->dst
);
601 if (ip_route_input(skb2
, eiph
->daddr
, eiph
->saddr
, eiph
->tos
,
603 skb_dst(skb2
)->dev
->type
!= ARPHRD_TUNNEL
)
607 /* change mtu on this route */
608 if (rel_type
== ICMP_DEST_UNREACH
&& rel_code
== ICMP_FRAG_NEEDED
) {
609 if (rel_info
> dst_mtu(skb_dst(skb2
)))
612 skb_dst(skb2
)->ops
->update_pmtu(skb_dst(skb2
), rel_info
);
614 if (rel_type
== ICMP_REDIRECT
) {
615 if (skb_dst(skb2
)->ops
->redirect
)
616 skb_dst(skb2
)->ops
->redirect(skb_dst(skb2
), skb2
);
619 icmp_send(skb2
, rel_type
, rel_code
, htonl(rel_info
));
627 ip6ip6_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
628 u8 type
, u8 code
, int offset
, __be32 info
)
633 __u32 rel_info
= ntohl(info
);
636 err
= ip6_tnl_err(skb
, IPPROTO_IPV6
, opt
, &rel_type
, &rel_code
,
637 &rel_msg
, &rel_info
, offset
);
641 if (rel_msg
&& pskb_may_pull(skb
, offset
+ sizeof(struct ipv6hdr
))) {
643 struct sk_buff
*skb2
= skb_clone(skb
, GFP_ATOMIC
);
649 skb_pull(skb2
, offset
);
650 skb_reset_network_header(skb2
);
652 /* Try to guess incoming interface */
653 rt
= rt6_lookup(dev_net(skb
->dev
), &ipv6_hdr(skb2
)->saddr
,
656 if (rt
&& rt
->dst
.dev
)
657 skb2
->dev
= rt
->dst
.dev
;
659 icmpv6_send(skb2
, rel_type
, rel_code
, rel_info
);
662 dst_release(&rt
->dst
);
670 static void ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl
*t
,
671 const struct ipv6hdr
*ipv6h
,
674 __u8 dsfield
= ipv6_get_dsfield(ipv6h
) & ~INET_ECN_MASK
;
676 if (t
->parms
.flags
& IP6_TNL_F_RCV_DSCP_COPY
)
677 ipv4_change_dsfield(ip_hdr(skb
), INET_ECN_MASK
, dsfield
);
679 if (INET_ECN_is_ce(dsfield
))
680 IP_ECN_set_ce(ip_hdr(skb
));
683 static void ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl
*t
,
684 const struct ipv6hdr
*ipv6h
,
687 if (t
->parms
.flags
& IP6_TNL_F_RCV_DSCP_COPY
)
688 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h
), ipv6_hdr(skb
));
690 if (INET_ECN_is_ce(ipv6_get_dsfield(ipv6h
)))
691 IP6_ECN_set_ce(ipv6_hdr(skb
));
694 static __u32
ip6_tnl_get_cap(struct ip6_tnl
*t
,
695 const struct in6_addr
*laddr
,
696 const struct in6_addr
*raddr
)
698 struct ip6_tnl_parm
*p
= &t
->parms
;
699 int ltype
= ipv6_addr_type(laddr
);
700 int rtype
= ipv6_addr_type(raddr
);
703 if (ltype
== IPV6_ADDR_ANY
|| rtype
== IPV6_ADDR_ANY
) {
704 flags
= IP6_TNL_F_CAP_PER_PACKET
;
705 } else if (ltype
& (IPV6_ADDR_UNICAST
|IPV6_ADDR_MULTICAST
) &&
706 rtype
& (IPV6_ADDR_UNICAST
|IPV6_ADDR_MULTICAST
) &&
707 !((ltype
|rtype
) & IPV6_ADDR_LOOPBACK
) &&
708 (!((ltype
|rtype
) & IPV6_ADDR_LINKLOCAL
) || p
->link
)) {
709 if (ltype
&IPV6_ADDR_UNICAST
)
710 flags
|= IP6_TNL_F_CAP_XMIT
;
711 if (rtype
&IPV6_ADDR_UNICAST
)
712 flags
|= IP6_TNL_F_CAP_RCV
;
717 /* called with rcu_read_lock() */
718 static inline int ip6_tnl_rcv_ctl(struct ip6_tnl
*t
,
719 const struct in6_addr
*laddr
,
720 const struct in6_addr
*raddr
)
722 struct ip6_tnl_parm
*p
= &t
->parms
;
724 struct net
*net
= dev_net(t
->dev
);
726 if ((p
->flags
& IP6_TNL_F_CAP_RCV
) ||
727 ((p
->flags
& IP6_TNL_F_CAP_PER_PACKET
) &&
728 (ip6_tnl_get_cap(t
, laddr
, raddr
) & IP6_TNL_F_CAP_RCV
))) {
729 struct net_device
*ldev
= NULL
;
732 ldev
= dev_get_by_index_rcu(net
, p
->link
);
734 if ((ipv6_addr_is_multicast(laddr
) ||
735 likely(ipv6_chk_addr(net
, laddr
, ldev
, 0))) &&
736 likely(!ipv6_chk_addr(net
, raddr
, NULL
, 0)))
743 * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally
744 * @skb: received socket buffer
745 * @protocol: ethernet protocol ID
746 * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN
751 static int ip6_tnl_rcv(struct sk_buff
*skb
, __u16 protocol
,
753 void (*dscp_ecn_decapsulate
)(const struct ip6_tnl
*t
,
754 const struct ipv6hdr
*ipv6h
,
755 struct sk_buff
*skb
))
758 const struct ipv6hdr
*ipv6h
= ipv6_hdr(skb
);
762 if ((t
= ip6_tnl_lookup(dev_net(skb
->dev
), &ipv6h
->saddr
,
763 &ipv6h
->daddr
)) != NULL
) {
764 struct pcpu_tstats
*tstats
;
766 if (t
->parms
.proto
!= ipproto
&& t
->parms
.proto
!= 0) {
771 if (!xfrm6_policy_check(NULL
, XFRM_POLICY_IN
, skb
)) {
776 if (!ip6_tnl_rcv_ctl(t
, &ipv6h
->daddr
, &ipv6h
->saddr
)) {
777 t
->dev
->stats
.rx_dropped
++;
782 skb
->mac_header
= skb
->network_header
;
783 skb_reset_network_header(skb
);
784 skb
->protocol
= htons(protocol
);
785 skb
->pkt_type
= PACKET_HOST
;
786 memset(skb
->cb
, 0, sizeof(struct inet6_skb_parm
));
788 tstats
= this_cpu_ptr(t
->dev
->tstats
);
789 tstats
->rx_packets
++;
790 tstats
->rx_bytes
+= skb
->len
;
792 __skb_tunnel_rx(skb
, t
->dev
);
794 dscp_ecn_decapsulate(t
, ipv6h
, skb
);
809 static int ip4ip6_rcv(struct sk_buff
*skb
)
811 return ip6_tnl_rcv(skb
, ETH_P_IP
, IPPROTO_IPIP
,
812 ip4ip6_dscp_ecn_decapsulate
);
815 static int ip6ip6_rcv(struct sk_buff
*skb
)
817 return ip6_tnl_rcv(skb
, ETH_P_IPV6
, IPPROTO_IPV6
,
818 ip6ip6_dscp_ecn_decapsulate
);
821 struct ipv6_tel_txoption
{
822 struct ipv6_txoptions ops
;
826 static void init_tel_txopt(struct ipv6_tel_txoption
*opt
, __u8 encap_limit
)
828 memset(opt
, 0, sizeof(struct ipv6_tel_txoption
));
830 opt
->dst_opt
[2] = IPV6_TLV_TNL_ENCAP_LIMIT
;
832 opt
->dst_opt
[4] = encap_limit
;
833 opt
->dst_opt
[5] = IPV6_TLV_PADN
;
836 opt
->ops
.dst0opt
= (struct ipv6_opt_hdr
*) opt
->dst_opt
;
837 opt
->ops
.opt_nflen
= 8;
841 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
842 * @t: the outgoing tunnel device
843 * @hdr: IPv6 header from the incoming packet
846 * Avoid trivial tunneling loop by checking that tunnel exit-point
847 * doesn't match source of incoming packet.
855 ip6_tnl_addr_conflict(const struct ip6_tnl
*t
, const struct ipv6hdr
*hdr
)
857 return ipv6_addr_equal(&t
->parms
.raddr
, &hdr
->saddr
);
860 static inline int ip6_tnl_xmit_ctl(struct ip6_tnl
*t
)
862 struct ip6_tnl_parm
*p
= &t
->parms
;
864 struct net
*net
= dev_net(t
->dev
);
866 if (p
->flags
& IP6_TNL_F_CAP_XMIT
) {
867 struct net_device
*ldev
= NULL
;
871 ldev
= dev_get_by_index_rcu(net
, p
->link
);
873 if (unlikely(!ipv6_chk_addr(net
, &p
->laddr
, ldev
, 0)))
874 pr_warn("%s xmit: Local address not yet configured!\n",
876 else if (!ipv6_addr_is_multicast(&p
->raddr
) &&
877 unlikely(ipv6_chk_addr(net
, &p
->raddr
, NULL
, 0)))
878 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n",
887 * ip6_tnl_xmit2 - encapsulate packet and send
888 * @skb: the outgoing socket buffer
889 * @dev: the outgoing tunnel device
890 * @dsfield: dscp code for outer header
891 * @fl: flow of tunneled packet
892 * @encap_limit: encapsulation limit
893 * @pmtu: Path MTU is stored if packet is too big
896 * Build new header and do some sanity checks on the packet before sending
902 * %-EMSGSIZE message too big. return mtu in this case.
905 static int ip6_tnl_xmit2(struct sk_buff
*skb
,
906 struct net_device
*dev
,
912 struct net
*net
= dev_net(dev
);
913 struct ip6_tnl
*t
= netdev_priv(dev
);
914 struct net_device_stats
*stats
= &t
->dev
->stats
;
915 struct ipv6hdr
*ipv6h
= ipv6_hdr(skb
);
916 struct ipv6_tel_txoption opt
;
917 struct dst_entry
*dst
= NULL
, *ndst
= NULL
;
918 struct net_device
*tdev
;
920 unsigned int max_headroom
= sizeof(struct ipv6hdr
);
925 if (!fl6
->flowi6_mark
)
926 dst
= ip6_tnl_dst_check(t
);
928 ndst
= ip6_route_output(net
, NULL
, fl6
);
931 goto tx_err_link_failure
;
932 ndst
= xfrm_lookup(net
, ndst
, flowi6_to_flowi(fl6
), NULL
, 0);
936 goto tx_err_link_failure
;
945 net_warn_ratelimited("%s: Local routing loop detected!\n",
947 goto tx_err_dst_release
;
949 mtu
= dst_mtu(dst
) - sizeof (*ipv6h
);
950 if (encap_limit
>= 0) {
954 if (mtu
< IPV6_MIN_MTU
)
957 skb_dst(skb
)->ops
->update_pmtu(skb_dst(skb
), mtu
);
958 if (skb
->len
> mtu
) {
961 goto tx_err_dst_release
;
965 * Okay, now see if we can stuff it in the buffer as-is.
967 max_headroom
+= LL_RESERVED_SPACE(tdev
);
969 if (skb_headroom(skb
) < max_headroom
|| skb_shared(skb
) ||
970 (skb_cloned(skb
) && !skb_clone_writable(skb
, 0))) {
971 struct sk_buff
*new_skb
;
973 if (!(new_skb
= skb_realloc_headroom(skb
, max_headroom
)))
974 goto tx_err_dst_release
;
977 skb_set_owner_w(new_skb
, skb
->sk
);
982 if (fl6
->flowi6_mark
) {
983 skb_dst_set(skb
, dst
);
986 skb_dst_set_noref(skb
, dst
);
988 skb
->transport_header
= skb
->network_header
;
990 proto
= fl6
->flowi6_proto
;
991 if (encap_limit
>= 0) {
992 init_tel_txopt(&opt
, encap_limit
);
993 ipv6_push_nfrag_opts(skb
, &opt
.ops
, &proto
, NULL
);
995 skb_push(skb
, sizeof(struct ipv6hdr
));
996 skb_reset_network_header(skb
);
997 ipv6h
= ipv6_hdr(skb
);
998 *(__be32
*)ipv6h
= fl6
->flowlabel
| htonl(0x60000000);
999 dsfield
= INET_ECN_encapsulate(0, dsfield
);
1000 ipv6_change_dsfield(ipv6h
, ~INET_ECN_MASK
, dsfield
);
1001 ipv6h
->hop_limit
= t
->parms
.hop_limit
;
1002 ipv6h
->nexthdr
= proto
;
1003 ipv6h
->saddr
= fl6
->saddr
;
1004 ipv6h
->daddr
= fl6
->daddr
;
1007 err
= ip6_local_out(skb
);
1009 if (net_xmit_eval(err
) == 0) {
1010 struct pcpu_tstats
*tstats
= this_cpu_ptr(t
->dev
->tstats
);
1012 tstats
->tx_bytes
+= pkt_len
;
1013 tstats
->tx_packets
++;
1016 stats
->tx_aborted_errors
++;
1019 ip6_tnl_dst_store(t
, ndst
);
1021 tx_err_link_failure
:
1022 stats
->tx_carrier_errors
++;
1023 dst_link_failure(skb
);
1030 ip4ip6_tnl_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
1032 struct ip6_tnl
*t
= netdev_priv(dev
);
1033 const struct iphdr
*iph
= ip_hdr(skb
);
1034 int encap_limit
= -1;
1040 if ((t
->parms
.proto
!= IPPROTO_IPIP
&& t
->parms
.proto
!= 0) ||
1041 !ip6_tnl_xmit_ctl(t
))
1044 if (!(t
->parms
.flags
& IP6_TNL_F_IGN_ENCAP_LIMIT
))
1045 encap_limit
= t
->parms
.encap_limit
;
1047 memcpy(&fl6
, &t
->fl
.u
.ip6
, sizeof (fl6
));
1048 fl6
.flowi6_proto
= IPPROTO_IPIP
;
1050 dsfield
= ipv4_get_dsfield(iph
);
1052 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_TCLASS
)
1053 fl6
.flowlabel
|= htonl((__u32
)iph
->tos
<< IPV6_TCLASS_SHIFT
)
1055 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_FWMARK
)
1056 fl6
.flowi6_mark
= skb
->mark
;
1058 err
= ip6_tnl_xmit2(skb
, dev
, dsfield
, &fl6
, encap_limit
, &mtu
);
1060 /* XXX: send ICMP error even if DF is not set. */
1061 if (err
== -EMSGSIZE
)
1062 icmp_send(skb
, ICMP_DEST_UNREACH
, ICMP_FRAG_NEEDED
,
1071 ip6ip6_tnl_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
1073 struct ip6_tnl
*t
= netdev_priv(dev
);
1074 struct ipv6hdr
*ipv6h
= ipv6_hdr(skb
);
1075 int encap_limit
= -1;
1082 if ((t
->parms
.proto
!= IPPROTO_IPV6
&& t
->parms
.proto
!= 0) ||
1083 !ip6_tnl_xmit_ctl(t
) || ip6_tnl_addr_conflict(t
, ipv6h
))
1086 offset
= parse_tlv_tnl_enc_lim(skb
, skb_network_header(skb
));
1088 struct ipv6_tlv_tnl_enc_lim
*tel
;
1089 tel
= (struct ipv6_tlv_tnl_enc_lim
*)&skb_network_header(skb
)[offset
];
1090 if (tel
->encap_limit
== 0) {
1091 icmpv6_send(skb
, ICMPV6_PARAMPROB
,
1092 ICMPV6_HDR_FIELD
, offset
+ 2);
1095 encap_limit
= tel
->encap_limit
- 1;
1096 } else if (!(t
->parms
.flags
& IP6_TNL_F_IGN_ENCAP_LIMIT
))
1097 encap_limit
= t
->parms
.encap_limit
;
1099 memcpy(&fl6
, &t
->fl
.u
.ip6
, sizeof (fl6
));
1100 fl6
.flowi6_proto
= IPPROTO_IPV6
;
1102 dsfield
= ipv6_get_dsfield(ipv6h
);
1103 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_TCLASS
)
1104 fl6
.flowlabel
|= (*(__be32
*) ipv6h
& IPV6_TCLASS_MASK
);
1105 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_FLOWLABEL
)
1106 fl6
.flowlabel
|= (*(__be32
*) ipv6h
& IPV6_FLOWLABEL_MASK
);
1107 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_FWMARK
)
1108 fl6
.flowi6_mark
= skb
->mark
;
1110 err
= ip6_tnl_xmit2(skb
, dev
, dsfield
, &fl6
, encap_limit
, &mtu
);
1112 if (err
== -EMSGSIZE
)
1113 icmpv6_send(skb
, ICMPV6_PKT_TOOBIG
, 0, mtu
);
1121 ip6_tnl_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
1123 struct ip6_tnl
*t
= netdev_priv(dev
);
1124 struct net_device_stats
*stats
= &t
->dev
->stats
;
1127 switch (skb
->protocol
) {
1128 case htons(ETH_P_IP
):
1129 ret
= ip4ip6_tnl_xmit(skb
, dev
);
1131 case htons(ETH_P_IPV6
):
1132 ret
= ip6ip6_tnl_xmit(skb
, dev
);
1141 return NETDEV_TX_OK
;
1145 stats
->tx_dropped
++;
1147 return NETDEV_TX_OK
;
1150 static void ip6_tnl_link_config(struct ip6_tnl
*t
)
1152 struct net_device
*dev
= t
->dev
;
1153 struct ip6_tnl_parm
*p
= &t
->parms
;
1154 struct flowi6
*fl6
= &t
->fl
.u
.ip6
;
1156 memcpy(dev
->dev_addr
, &p
->laddr
, sizeof(struct in6_addr
));
1157 memcpy(dev
->broadcast
, &p
->raddr
, sizeof(struct in6_addr
));
1159 /* Set up flowi template */
1160 fl6
->saddr
= p
->laddr
;
1161 fl6
->daddr
= p
->raddr
;
1162 fl6
->flowi6_oif
= p
->link
;
1165 if (!(p
->flags
&IP6_TNL_F_USE_ORIG_TCLASS
))
1166 fl6
->flowlabel
|= IPV6_TCLASS_MASK
& p
->flowinfo
;
1167 if (!(p
->flags
&IP6_TNL_F_USE_ORIG_FLOWLABEL
))
1168 fl6
->flowlabel
|= IPV6_FLOWLABEL_MASK
& p
->flowinfo
;
1170 p
->flags
&= ~(IP6_TNL_F_CAP_XMIT
|IP6_TNL_F_CAP_RCV
|IP6_TNL_F_CAP_PER_PACKET
);
1171 p
->flags
|= ip6_tnl_get_cap(t
, &p
->laddr
, &p
->raddr
);
1173 if (p
->flags
&IP6_TNL_F_CAP_XMIT
&& p
->flags
&IP6_TNL_F_CAP_RCV
)
1174 dev
->flags
|= IFF_POINTOPOINT
;
1176 dev
->flags
&= ~IFF_POINTOPOINT
;
1178 dev
->iflink
= p
->link
;
1180 if (p
->flags
& IP6_TNL_F_CAP_XMIT
) {
1181 int strict
= (ipv6_addr_type(&p
->raddr
) &
1182 (IPV6_ADDR_MULTICAST
|IPV6_ADDR_LINKLOCAL
));
1184 struct rt6_info
*rt
= rt6_lookup(dev_net(dev
),
1185 &p
->raddr
, &p
->laddr
,
1192 dev
->hard_header_len
= rt
->dst
.dev
->hard_header_len
+
1193 sizeof (struct ipv6hdr
);
1195 dev
->mtu
= rt
->dst
.dev
->mtu
- sizeof (struct ipv6hdr
);
1196 if (!(t
->parms
.flags
& IP6_TNL_F_IGN_ENCAP_LIMIT
))
1199 if (dev
->mtu
< IPV6_MIN_MTU
)
1200 dev
->mtu
= IPV6_MIN_MTU
;
1202 dst_release(&rt
->dst
);
1207 * ip6_tnl_change - update the tunnel parameters
1208 * @t: tunnel to be changed
1209 * @p: tunnel configuration parameters
1212 * ip6_tnl_change() updates the tunnel parameters
1216 ip6_tnl_change(struct ip6_tnl
*t
, struct ip6_tnl_parm
*p
)
1218 t
->parms
.laddr
= p
->laddr
;
1219 t
->parms
.raddr
= p
->raddr
;
1220 t
->parms
.flags
= p
->flags
;
1221 t
->parms
.hop_limit
= p
->hop_limit
;
1222 t
->parms
.encap_limit
= p
->encap_limit
;
1223 t
->parms
.flowinfo
= p
->flowinfo
;
1224 t
->parms
.link
= p
->link
;
1225 t
->parms
.proto
= p
->proto
;
1226 ip6_tnl_dst_reset(t
);
1227 ip6_tnl_link_config(t
);
1232 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
1233 * @dev: virtual device associated with tunnel
1234 * @ifr: parameters passed from userspace
1235 * @cmd: command to be performed
1238 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
1241 * The possible commands are the following:
1242 * %SIOCGETTUNNEL: get tunnel parameters for device
1243 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1244 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1245 * %SIOCDELTUNNEL: delete tunnel
1247 * The fallback device "ip6tnl0", created during module
1248 * initialization, can be used for creating other tunnel devices.
1252 * %-EFAULT if unable to copy data to or from userspace,
1253 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1254 * %-EINVAL if passed tunnel parameters are invalid,
1255 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1256 * %-ENODEV if attempting to change or delete a nonexisting device
1260 ip6_tnl_ioctl(struct net_device
*dev
, struct ifreq
*ifr
, int cmd
)
1263 struct ip6_tnl_parm p
;
1264 struct ip6_tnl
*t
= NULL
;
1265 struct net
*net
= dev_net(dev
);
1266 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
1270 if (dev
== ip6n
->fb_tnl_dev
) {
1271 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof (p
))) {
1275 t
= ip6_tnl_locate(net
, &p
, 0);
1278 t
= netdev_priv(dev
);
1279 memcpy(&p
, &t
->parms
, sizeof (p
));
1280 if (copy_to_user(ifr
->ifr_ifru
.ifru_data
, &p
, sizeof (p
))) {
1287 if (!capable(CAP_NET_ADMIN
))
1290 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof (p
)))
1293 if (p
.proto
!= IPPROTO_IPV6
&& p
.proto
!= IPPROTO_IPIP
&&
1296 t
= ip6_tnl_locate(net
, &p
, cmd
== SIOCADDTUNNEL
);
1297 if (dev
!= ip6n
->fb_tnl_dev
&& cmd
== SIOCCHGTUNNEL
) {
1299 if (t
->dev
!= dev
) {
1304 t
= netdev_priv(dev
);
1306 ip6_tnl_unlink(ip6n
, t
);
1308 err
= ip6_tnl_change(t
, &p
);
1309 ip6_tnl_link(ip6n
, t
);
1310 netdev_state_change(dev
);
1314 if (copy_to_user(ifr
->ifr_ifru
.ifru_data
, &t
->parms
, sizeof (p
)))
1318 err
= (cmd
== SIOCADDTUNNEL
? -ENOBUFS
: -ENOENT
);
1322 if (!capable(CAP_NET_ADMIN
))
1325 if (dev
== ip6n
->fb_tnl_dev
) {
1327 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof (p
)))
1330 if ((t
= ip6_tnl_locate(net
, &p
, 0)) == NULL
)
1333 if (t
->dev
== ip6n
->fb_tnl_dev
)
1338 unregister_netdevice(dev
);
1347 * ip6_tnl_change_mtu - change mtu manually for tunnel device
1348 * @dev: virtual device associated with tunnel
1349 * @new_mtu: the new mtu
1353 * %-EINVAL if mtu too small
1357 ip6_tnl_change_mtu(struct net_device
*dev
, int new_mtu
)
1359 if (new_mtu
< IPV6_MIN_MTU
) {
1367 static const struct net_device_ops ip6_tnl_netdev_ops
= {
1368 .ndo_uninit
= ip6_tnl_dev_uninit
,
1369 .ndo_start_xmit
= ip6_tnl_xmit
,
1370 .ndo_do_ioctl
= ip6_tnl_ioctl
,
1371 .ndo_change_mtu
= ip6_tnl_change_mtu
,
1372 .ndo_get_stats
= ip6_get_stats
,
1377 * ip6_tnl_dev_setup - setup virtual tunnel device
1378 * @dev: virtual device associated with tunnel
1381 * Initialize function pointers and device parameters
1384 static void ip6_tnl_dev_setup(struct net_device
*dev
)
1388 dev
->netdev_ops
= &ip6_tnl_netdev_ops
;
1389 dev
->destructor
= ip6_dev_free
;
1391 dev
->type
= ARPHRD_TUNNEL6
;
1392 dev
->hard_header_len
= LL_MAX_HEADER
+ sizeof (struct ipv6hdr
);
1393 dev
->mtu
= ETH_DATA_LEN
- sizeof (struct ipv6hdr
);
1394 t
= netdev_priv(dev
);
1395 if (!(t
->parms
.flags
& IP6_TNL_F_IGN_ENCAP_LIMIT
))
1397 dev
->flags
|= IFF_NOARP
;
1398 dev
->addr_len
= sizeof(struct in6_addr
);
1399 dev
->features
|= NETIF_F_NETNS_LOCAL
;
1400 dev
->priv_flags
&= ~IFF_XMIT_DST_RELEASE
;
1405 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
1406 * @dev: virtual device associated with tunnel
1410 ip6_tnl_dev_init_gen(struct net_device
*dev
)
1412 struct ip6_tnl
*t
= netdev_priv(dev
);
1415 dev
->tstats
= alloc_percpu(struct pcpu_tstats
);
1422 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
1423 * @dev: virtual device associated with tunnel
1426 static int ip6_tnl_dev_init(struct net_device
*dev
)
1428 struct ip6_tnl
*t
= netdev_priv(dev
);
1429 int err
= ip6_tnl_dev_init_gen(dev
);
1433 ip6_tnl_link_config(t
);
1438 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
1439 * @dev: fallback device
1444 static int __net_init
ip6_fb_tnl_dev_init(struct net_device
*dev
)
1446 struct ip6_tnl
*t
= netdev_priv(dev
);
1447 struct net
*net
= dev_net(dev
);
1448 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
1449 int err
= ip6_tnl_dev_init_gen(dev
);
1454 t
->parms
.proto
= IPPROTO_IPV6
;
1457 ip6_tnl_link_config(t
);
1459 rcu_assign_pointer(ip6n
->tnls_wc
[0], t
);
1463 static struct xfrm6_tunnel ip4ip6_handler __read_mostly
= {
1464 .handler
= ip4ip6_rcv
,
1465 .err_handler
= ip4ip6_err
,
1469 static struct xfrm6_tunnel ip6ip6_handler __read_mostly
= {
1470 .handler
= ip6ip6_rcv
,
1471 .err_handler
= ip6ip6_err
,
1475 static void __net_exit
ip6_tnl_destroy_tunnels(struct ip6_tnl_net
*ip6n
)
1481 for (h
= 0; h
< HASH_SIZE
; h
++) {
1482 t
= rtnl_dereference(ip6n
->tnls_r_l
[h
]);
1484 unregister_netdevice_queue(t
->dev
, &list
);
1485 t
= rtnl_dereference(t
->next
);
1489 t
= rtnl_dereference(ip6n
->tnls_wc
[0]);
1490 unregister_netdevice_queue(t
->dev
, &list
);
1491 unregister_netdevice_many(&list
);
1494 static int __net_init
ip6_tnl_init_net(struct net
*net
)
1496 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
1497 struct ip6_tnl
*t
= NULL
;
1500 ip6n
->tnls
[0] = ip6n
->tnls_wc
;
1501 ip6n
->tnls
[1] = ip6n
->tnls_r_l
;
1504 ip6n
->fb_tnl_dev
= alloc_netdev(sizeof(struct ip6_tnl
), "ip6tnl0",
1507 if (!ip6n
->fb_tnl_dev
)
1509 dev_net_set(ip6n
->fb_tnl_dev
, net
);
1511 err
= ip6_fb_tnl_dev_init(ip6n
->fb_tnl_dev
);
1515 err
= register_netdev(ip6n
->fb_tnl_dev
);
1519 t
= netdev_priv(ip6n
->fb_tnl_dev
);
1521 strcpy(t
->parms
.name
, ip6n
->fb_tnl_dev
->name
);
1525 ip6_dev_free(ip6n
->fb_tnl_dev
);
1530 static void __net_exit
ip6_tnl_exit_net(struct net
*net
)
1532 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
1535 ip6_tnl_destroy_tunnels(ip6n
);
1539 static struct pernet_operations ip6_tnl_net_ops
= {
1540 .init
= ip6_tnl_init_net
,
1541 .exit
= ip6_tnl_exit_net
,
1542 .id
= &ip6_tnl_net_id
,
1543 .size
= sizeof(struct ip6_tnl_net
),
1547 * ip6_tunnel_init - register protocol and reserve needed resources
1549 * Return: 0 on success
1552 static int __init
ip6_tunnel_init(void)
1556 err
= register_pernet_device(&ip6_tnl_net_ops
);
1560 err
= xfrm6_tunnel_register(&ip4ip6_handler
, AF_INET
);
1562 pr_err("%s: can't register ip4ip6\n", __func__
);
1566 err
= xfrm6_tunnel_register(&ip6ip6_handler
, AF_INET6
);
1568 pr_err("%s: can't register ip6ip6\n", __func__
);
1575 xfrm6_tunnel_deregister(&ip4ip6_handler
, AF_INET
);
1577 unregister_pernet_device(&ip6_tnl_net_ops
);
1583 * ip6_tunnel_cleanup - free resources and unregister protocol
1586 static void __exit
ip6_tunnel_cleanup(void)
1588 if (xfrm6_tunnel_deregister(&ip4ip6_handler
, AF_INET
))
1589 pr_info("%s: can't deregister ip4ip6\n", __func__
);
1591 if (xfrm6_tunnel_deregister(&ip6ip6_handler
, AF_INET6
))
1592 pr_info("%s: can't deregister ip6ip6\n", __func__
);
1594 unregister_pernet_device(&ip6_tnl_net_ops
);
1597 module_init(ip6_tunnel_init
);
1598 module_exit(ip6_tunnel_cleanup
);