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>
43 #include <linux/hash.h>
45 #include <asm/uaccess.h>
46 #include <linux/atomic.h>
50 #include <net/ip_tunnels.h>
52 #include <net/ip6_route.h>
53 #include <net/addrconf.h>
54 #include <net/ip6_tunnel.h>
56 #include <net/dsfield.h>
57 #include <net/inet_ecn.h>
58 #include <net/net_namespace.h>
59 #include <net/netns/generic.h>
61 MODULE_AUTHOR("Ville Nuorvala");
62 MODULE_DESCRIPTION("IPv6 tunneling device");
63 MODULE_LICENSE("GPL");
64 MODULE_ALIAS_NETDEV("ip6tnl0");
67 #define IP6_TNL_TRACE(x...) pr_debug("%s:" x "\n", __func__)
69 #define IP6_TNL_TRACE(x...) do {;} while(0)
72 #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
73 #define IPV6_TCLASS_SHIFT 20
75 #define HASH_SIZE_SHIFT 5
76 #define HASH_SIZE (1 << HASH_SIZE_SHIFT)
78 static bool log_ecn_error
= true;
79 module_param(log_ecn_error
, bool, 0644);
80 MODULE_PARM_DESC(log_ecn_error
, "Log packets received with corrupted ECN");
82 static u32
HASH(const struct in6_addr
*addr1
, const struct in6_addr
*addr2
)
84 u32 hash
= ipv6_addr_hash(addr1
) ^ ipv6_addr_hash(addr2
);
86 return hash_32(hash
, HASH_SIZE_SHIFT
);
89 static int ip6_tnl_dev_init(struct net_device
*dev
);
90 static void ip6_tnl_dev_setup(struct net_device
*dev
);
91 static struct rtnl_link_ops ip6_link_ops __read_mostly
;
93 static int ip6_tnl_net_id __read_mostly
;
95 /* the IPv6 tunnel fallback device */
96 struct net_device
*fb_tnl_dev
;
97 /* lists for storing tunnels in use */
98 struct ip6_tnl __rcu
*tnls_r_l
[HASH_SIZE
];
99 struct ip6_tnl __rcu
*tnls_wc
[1];
100 struct ip6_tnl __rcu
**tnls
[2];
103 static struct net_device_stats
*ip6_get_stats(struct net_device
*dev
)
105 struct pcpu_tstats sum
= { 0 };
108 for_each_possible_cpu(i
) {
109 const struct pcpu_tstats
*tstats
= per_cpu_ptr(dev
->tstats
, i
);
111 sum
.rx_packets
+= tstats
->rx_packets
;
112 sum
.rx_bytes
+= tstats
->rx_bytes
;
113 sum
.tx_packets
+= tstats
->tx_packets
;
114 sum
.tx_bytes
+= tstats
->tx_bytes
;
116 dev
->stats
.rx_packets
= sum
.rx_packets
;
117 dev
->stats
.rx_bytes
= sum
.rx_bytes
;
118 dev
->stats
.tx_packets
= sum
.tx_packets
;
119 dev
->stats
.tx_bytes
= sum
.tx_bytes
;
124 * Locking : hash tables are protected by RCU and RTNL
127 struct dst_entry
*ip6_tnl_dst_check(struct ip6_tnl
*t
)
129 struct dst_entry
*dst
= t
->dst_cache
;
131 if (dst
&& dst
->obsolete
&&
132 dst
->ops
->check(dst
, t
->dst_cookie
) == NULL
) {
140 EXPORT_SYMBOL_GPL(ip6_tnl_dst_check
);
142 void ip6_tnl_dst_reset(struct ip6_tnl
*t
)
144 dst_release(t
->dst_cache
);
147 EXPORT_SYMBOL_GPL(ip6_tnl_dst_reset
);
149 void ip6_tnl_dst_store(struct ip6_tnl
*t
, struct dst_entry
*dst
)
151 struct rt6_info
*rt
= (struct rt6_info
*) dst
;
152 t
->dst_cookie
= rt
->rt6i_node
? rt
->rt6i_node
->fn_sernum
: 0;
153 dst_release(t
->dst_cache
);
156 EXPORT_SYMBOL_GPL(ip6_tnl_dst_store
);
159 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
160 * @remote: the address of the tunnel exit-point
161 * @local: the address of the tunnel entry-point
164 * tunnel matching given end-points if found,
165 * else fallback tunnel if its device is up,
169 #define for_each_ip6_tunnel_rcu(start) \
170 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
172 static struct ip6_tnl
*
173 ip6_tnl_lookup(struct net
*net
, const struct in6_addr
*remote
, const struct in6_addr
*local
)
175 unsigned int hash
= HASH(remote
, local
);
177 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
179 for_each_ip6_tunnel_rcu(ip6n
->tnls_r_l
[hash
]) {
180 if (ipv6_addr_equal(local
, &t
->parms
.laddr
) &&
181 ipv6_addr_equal(remote
, &t
->parms
.raddr
) &&
182 (t
->dev
->flags
& IFF_UP
))
185 t
= rcu_dereference(ip6n
->tnls_wc
[0]);
186 if (t
&& (t
->dev
->flags
& IFF_UP
))
193 * ip6_tnl_bucket - get head of list matching given tunnel parameters
194 * @p: parameters containing tunnel end-points
197 * ip6_tnl_bucket() returns the head of the list matching the
198 * &struct in6_addr entries laddr and raddr in @p.
200 * Return: head of IPv6 tunnel list
203 static struct ip6_tnl __rcu
**
204 ip6_tnl_bucket(struct ip6_tnl_net
*ip6n
, const struct __ip6_tnl_parm
*p
)
206 const struct in6_addr
*remote
= &p
->raddr
;
207 const struct in6_addr
*local
= &p
->laddr
;
211 if (!ipv6_addr_any(remote
) || !ipv6_addr_any(local
)) {
213 h
= HASH(remote
, local
);
215 return &ip6n
->tnls
[prio
][h
];
219 * ip6_tnl_link - add tunnel to hash table
220 * @t: tunnel to be added
224 ip6_tnl_link(struct ip6_tnl_net
*ip6n
, struct ip6_tnl
*t
)
226 struct ip6_tnl __rcu
**tp
= ip6_tnl_bucket(ip6n
, &t
->parms
);
228 rcu_assign_pointer(t
->next
, rtnl_dereference(*tp
));
229 rcu_assign_pointer(*tp
, t
);
233 * ip6_tnl_unlink - remove tunnel from hash table
234 * @t: tunnel to be removed
238 ip6_tnl_unlink(struct ip6_tnl_net
*ip6n
, struct ip6_tnl
*t
)
240 struct ip6_tnl __rcu
**tp
;
241 struct ip6_tnl
*iter
;
243 for (tp
= ip6_tnl_bucket(ip6n
, &t
->parms
);
244 (iter
= rtnl_dereference(*tp
)) != NULL
;
247 rcu_assign_pointer(*tp
, t
->next
);
253 static void ip6_dev_free(struct net_device
*dev
)
255 free_percpu(dev
->tstats
);
259 static int ip6_tnl_create2(struct net_device
*dev
)
261 struct ip6_tnl
*t
= netdev_priv(dev
);
262 struct net
*net
= dev_net(dev
);
263 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
266 t
= netdev_priv(dev
);
267 err
= ip6_tnl_dev_init(dev
);
271 err
= register_netdevice(dev
);
275 strcpy(t
->parms
.name
, dev
->name
);
276 dev
->rtnl_link_ops
= &ip6_link_ops
;
279 ip6_tnl_link(ip6n
, t
);
287 * ip6_tnl_create - create a new tunnel
288 * @p: tunnel parameters
289 * @pt: pointer to new tunnel
292 * Create tunnel matching given parameters.
295 * created tunnel or NULL
298 static struct ip6_tnl
*ip6_tnl_create(struct net
*net
, struct __ip6_tnl_parm
*p
)
300 struct net_device
*dev
;
306 strlcpy(name
, p
->name
, IFNAMSIZ
);
308 sprintf(name
, "ip6tnl%%d");
310 dev
= alloc_netdev(sizeof (*t
), name
, ip6_tnl_dev_setup
);
314 dev_net_set(dev
, net
);
316 t
= netdev_priv(dev
);
318 err
= ip6_tnl_create2(dev
);
331 * ip6_tnl_locate - find or create tunnel matching given parameters
332 * @p: tunnel parameters
333 * @create: != 0 if allowed to create new tunnel if no match found
336 * ip6_tnl_locate() first tries to locate an existing tunnel
337 * based on @parms. If this is unsuccessful, but @create is set a new
338 * tunnel device is created and registered for use.
341 * matching tunnel or NULL
344 static struct ip6_tnl
*ip6_tnl_locate(struct net
*net
,
345 struct __ip6_tnl_parm
*p
, int create
)
347 const struct in6_addr
*remote
= &p
->raddr
;
348 const struct in6_addr
*local
= &p
->laddr
;
349 struct ip6_tnl __rcu
**tp
;
351 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
353 for (tp
= ip6_tnl_bucket(ip6n
, p
);
354 (t
= rtnl_dereference(*tp
)) != NULL
;
356 if (ipv6_addr_equal(local
, &t
->parms
.laddr
) &&
357 ipv6_addr_equal(remote
, &t
->parms
.raddr
))
362 return ip6_tnl_create(net
, p
);
366 * ip6_tnl_dev_uninit - tunnel device uninitializer
367 * @dev: the device to be destroyed
370 * ip6_tnl_dev_uninit() removes tunnel from its list
374 ip6_tnl_dev_uninit(struct net_device
*dev
)
376 struct ip6_tnl
*t
= netdev_priv(dev
);
377 struct net
*net
= dev_net(dev
);
378 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
380 if (dev
== ip6n
->fb_tnl_dev
)
381 RCU_INIT_POINTER(ip6n
->tnls_wc
[0], NULL
);
383 ip6_tnl_unlink(ip6n
, t
);
384 ip6_tnl_dst_reset(t
);
389 * parse_tvl_tnl_enc_lim - handle encapsulation limit option
390 * @skb: received socket buffer
393 * 0 if none was found,
394 * else index to encapsulation limit
397 __u16
ip6_tnl_parse_tlv_enc_lim(struct sk_buff
*skb
, __u8
*raw
)
399 const struct ipv6hdr
*ipv6h
= (const struct ipv6hdr
*) raw
;
400 __u8 nexthdr
= ipv6h
->nexthdr
;
401 __u16 off
= sizeof (*ipv6h
);
403 while (ipv6_ext_hdr(nexthdr
) && nexthdr
!= NEXTHDR_NONE
) {
405 struct ipv6_opt_hdr
*hdr
;
406 if (raw
+ off
+ sizeof (*hdr
) > skb
->data
&&
407 !pskb_may_pull(skb
, raw
- skb
->data
+ off
+ sizeof (*hdr
)))
410 hdr
= (struct ipv6_opt_hdr
*) (raw
+ off
);
411 if (nexthdr
== NEXTHDR_FRAGMENT
) {
412 struct frag_hdr
*frag_hdr
= (struct frag_hdr
*) hdr
;
413 if (frag_hdr
->frag_off
)
416 } else if (nexthdr
== NEXTHDR_AUTH
) {
417 optlen
= (hdr
->hdrlen
+ 2) << 2;
419 optlen
= ipv6_optlen(hdr
);
421 if (nexthdr
== NEXTHDR_DEST
) {
424 struct ipv6_tlv_tnl_enc_lim
*tel
;
426 /* No more room for encapsulation limit */
427 if (i
+ sizeof (*tel
) > off
+ optlen
)
430 tel
= (struct ipv6_tlv_tnl_enc_lim
*) &raw
[i
];
431 /* return index of option if found and valid */
432 if (tel
->type
== IPV6_TLV_TNL_ENCAP_LIMIT
&&
435 /* else jump to next option */
437 i
+= tel
->length
+ 2;
442 nexthdr
= hdr
->nexthdr
;
447 EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim
);
450 * ip6_tnl_err - tunnel error handler
453 * ip6_tnl_err() should handle errors in the tunnel according
454 * to the specifications in RFC 2473.
458 ip6_tnl_err(struct sk_buff
*skb
, __u8 ipproto
, struct inet6_skb_parm
*opt
,
459 u8
*type
, u8
*code
, int *msg
, __u32
*info
, int offset
)
461 const struct ipv6hdr
*ipv6h
= (const struct ipv6hdr
*) skb
->data
;
464 u8 rel_type
= ICMPV6_DEST_UNREACH
;
465 u8 rel_code
= ICMPV6_ADDR_UNREACH
;
470 /* If the packet doesn't contain the original IPv6 header we are
471 in trouble since we might need the source address for further
472 processing of the error. */
475 if ((t
= ip6_tnl_lookup(dev_net(skb
->dev
), &ipv6h
->daddr
,
476 &ipv6h
->saddr
)) == NULL
)
479 if (t
->parms
.proto
!= ipproto
&& t
->parms
.proto
!= 0)
486 struct ipv6_tlv_tnl_enc_lim
*tel
;
488 case ICMPV6_DEST_UNREACH
:
489 net_warn_ratelimited("%s: Path to destination invalid or inactive!\n",
493 case ICMPV6_TIME_EXCEED
:
494 if ((*code
) == ICMPV6_EXC_HOPLIMIT
) {
495 net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
500 case ICMPV6_PARAMPROB
:
502 if ((*code
) == ICMPV6_HDR_FIELD
)
503 teli
= ip6_tnl_parse_tlv_enc_lim(skb
, skb
->data
);
505 if (teli
&& teli
== *info
- 2) {
506 tel
= (struct ipv6_tlv_tnl_enc_lim
*) &skb
->data
[teli
];
507 if (tel
->encap_limit
== 0) {
508 net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
513 net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
517 case ICMPV6_PKT_TOOBIG
:
518 mtu
= *info
- offset
;
519 if (mtu
< IPV6_MIN_MTU
)
523 if ((len
= sizeof (*ipv6h
) + ntohs(ipv6h
->payload_len
)) > mtu
) {
524 rel_type
= ICMPV6_PKT_TOOBIG
;
543 ip4ip6_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
544 u8 type
, u8 code
, int offset
, __be32 info
)
549 __u32 rel_info
= ntohl(info
);
551 struct sk_buff
*skb2
;
552 const struct iphdr
*eiph
;
556 err
= ip6_tnl_err(skb
, IPPROTO_IPIP
, opt
, &rel_type
, &rel_code
,
557 &rel_msg
, &rel_info
, offset
);
565 case ICMPV6_DEST_UNREACH
:
566 if (rel_code
!= ICMPV6_ADDR_UNREACH
)
568 rel_type
= ICMP_DEST_UNREACH
;
569 rel_code
= ICMP_HOST_UNREACH
;
571 case ICMPV6_PKT_TOOBIG
:
574 rel_type
= ICMP_DEST_UNREACH
;
575 rel_code
= ICMP_FRAG_NEEDED
;
578 rel_type
= ICMP_REDIRECT
;
579 rel_code
= ICMP_REDIR_HOST
;
584 if (!pskb_may_pull(skb
, offset
+ sizeof(struct iphdr
)))
587 skb2
= skb_clone(skb
, GFP_ATOMIC
);
593 skb_pull(skb2
, offset
);
594 skb_reset_network_header(skb2
);
597 /* Try to guess incoming interface */
598 rt
= ip_route_output_ports(dev_net(skb
->dev
), &fl4
, NULL
,
601 IPPROTO_IPIP
, RT_TOS(eiph
->tos
), 0);
605 skb2
->dev
= rt
->dst
.dev
;
607 /* route "incoming" packet */
608 if (rt
->rt_flags
& RTCF_LOCAL
) {
611 rt
= ip_route_output_ports(dev_net(skb
->dev
), &fl4
, NULL
,
612 eiph
->daddr
, eiph
->saddr
,
615 RT_TOS(eiph
->tos
), 0);
617 rt
->dst
.dev
->type
!= ARPHRD_TUNNEL
) {
622 skb_dst_set(skb2
, &rt
->dst
);
625 if (ip_route_input(skb2
, eiph
->daddr
, eiph
->saddr
, eiph
->tos
,
627 skb_dst(skb2
)->dev
->type
!= ARPHRD_TUNNEL
)
631 /* change mtu on this route */
632 if (rel_type
== ICMP_DEST_UNREACH
&& rel_code
== ICMP_FRAG_NEEDED
) {
633 if (rel_info
> dst_mtu(skb_dst(skb2
)))
636 skb_dst(skb2
)->ops
->update_pmtu(skb_dst(skb2
), NULL
, skb2
, rel_info
);
638 if (rel_type
== ICMP_REDIRECT
)
639 skb_dst(skb2
)->ops
->redirect(skb_dst(skb2
), NULL
, skb2
);
641 icmp_send(skb2
, rel_type
, rel_code
, htonl(rel_info
));
649 ip6ip6_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
650 u8 type
, u8 code
, int offset
, __be32 info
)
655 __u32 rel_info
= ntohl(info
);
658 err
= ip6_tnl_err(skb
, IPPROTO_IPV6
, opt
, &rel_type
, &rel_code
,
659 &rel_msg
, &rel_info
, offset
);
663 if (rel_msg
&& pskb_may_pull(skb
, offset
+ sizeof(struct ipv6hdr
))) {
665 struct sk_buff
*skb2
= skb_clone(skb
, GFP_ATOMIC
);
671 skb_pull(skb2
, offset
);
672 skb_reset_network_header(skb2
);
674 /* Try to guess incoming interface */
675 rt
= rt6_lookup(dev_net(skb
->dev
), &ipv6_hdr(skb2
)->saddr
,
678 if (rt
&& rt
->dst
.dev
)
679 skb2
->dev
= rt
->dst
.dev
;
681 icmpv6_send(skb2
, rel_type
, rel_code
, rel_info
);
691 static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl
*t
,
692 const struct ipv6hdr
*ipv6h
,
695 __u8 dsfield
= ipv6_get_dsfield(ipv6h
) & ~INET_ECN_MASK
;
697 if (t
->parms
.flags
& IP6_TNL_F_RCV_DSCP_COPY
)
698 ipv4_change_dsfield(ip_hdr(skb
), INET_ECN_MASK
, dsfield
);
700 return IP6_ECN_decapsulate(ipv6h
, skb
);
703 static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl
*t
,
704 const struct ipv6hdr
*ipv6h
,
707 if (t
->parms
.flags
& IP6_TNL_F_RCV_DSCP_COPY
)
708 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h
), ipv6_hdr(skb
));
710 return IP6_ECN_decapsulate(ipv6h
, skb
);
713 __u32
ip6_tnl_get_cap(struct ip6_tnl
*t
,
714 const struct in6_addr
*laddr
,
715 const struct in6_addr
*raddr
)
717 struct __ip6_tnl_parm
*p
= &t
->parms
;
718 int ltype
= ipv6_addr_type(laddr
);
719 int rtype
= ipv6_addr_type(raddr
);
722 if (ltype
== IPV6_ADDR_ANY
|| rtype
== IPV6_ADDR_ANY
) {
723 flags
= IP6_TNL_F_CAP_PER_PACKET
;
724 } else if (ltype
& (IPV6_ADDR_UNICAST
|IPV6_ADDR_MULTICAST
) &&
725 rtype
& (IPV6_ADDR_UNICAST
|IPV6_ADDR_MULTICAST
) &&
726 !((ltype
|rtype
) & IPV6_ADDR_LOOPBACK
) &&
727 (!((ltype
|rtype
) & IPV6_ADDR_LINKLOCAL
) || p
->link
)) {
728 if (ltype
&IPV6_ADDR_UNICAST
)
729 flags
|= IP6_TNL_F_CAP_XMIT
;
730 if (rtype
&IPV6_ADDR_UNICAST
)
731 flags
|= IP6_TNL_F_CAP_RCV
;
735 EXPORT_SYMBOL(ip6_tnl_get_cap
);
737 /* called with rcu_read_lock() */
738 int ip6_tnl_rcv_ctl(struct ip6_tnl
*t
,
739 const struct in6_addr
*laddr
,
740 const struct in6_addr
*raddr
)
742 struct __ip6_tnl_parm
*p
= &t
->parms
;
744 struct net
*net
= dev_net(t
->dev
);
746 if ((p
->flags
& IP6_TNL_F_CAP_RCV
) ||
747 ((p
->flags
& IP6_TNL_F_CAP_PER_PACKET
) &&
748 (ip6_tnl_get_cap(t
, laddr
, raddr
) & IP6_TNL_F_CAP_RCV
))) {
749 struct net_device
*ldev
= NULL
;
752 ldev
= dev_get_by_index_rcu(net
, p
->link
);
754 if ((ipv6_addr_is_multicast(laddr
) ||
755 likely(ipv6_chk_addr(net
, laddr
, ldev
, 0))) &&
756 likely(!ipv6_chk_addr(net
, raddr
, NULL
, 0)))
761 EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl
);
764 * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally
765 * @skb: received socket buffer
766 * @protocol: ethernet protocol ID
767 * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN
772 static int ip6_tnl_rcv(struct sk_buff
*skb
, __u16 protocol
,
774 int (*dscp_ecn_decapsulate
)(const struct ip6_tnl
*t
,
775 const struct ipv6hdr
*ipv6h
,
776 struct sk_buff
*skb
))
779 const struct ipv6hdr
*ipv6h
= ipv6_hdr(skb
);
784 if ((t
= ip6_tnl_lookup(dev_net(skb
->dev
), &ipv6h
->saddr
,
785 &ipv6h
->daddr
)) != NULL
) {
786 struct pcpu_tstats
*tstats
;
788 if (t
->parms
.proto
!= ipproto
&& t
->parms
.proto
!= 0) {
793 if (!xfrm6_policy_check(NULL
, XFRM_POLICY_IN
, skb
)) {
798 if (!ip6_tnl_rcv_ctl(t
, &ipv6h
->daddr
, &ipv6h
->saddr
)) {
799 t
->dev
->stats
.rx_dropped
++;
804 skb
->mac_header
= skb
->network_header
;
805 skb_reset_network_header(skb
);
806 skb
->protocol
= htons(protocol
);
807 skb
->pkt_type
= PACKET_HOST
;
808 memset(skb
->cb
, 0, sizeof(struct inet6_skb_parm
));
810 __skb_tunnel_rx(skb
, t
->dev
);
812 err
= dscp_ecn_decapsulate(t
, ipv6h
, skb
);
815 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
817 ipv6_get_dsfield(ipv6h
));
819 ++t
->dev
->stats
.rx_frame_errors
;
820 ++t
->dev
->stats
.rx_errors
;
826 tstats
= this_cpu_ptr(t
->dev
->tstats
);
827 tstats
->rx_packets
++;
828 tstats
->rx_bytes
+= skb
->len
;
843 static int ip4ip6_rcv(struct sk_buff
*skb
)
845 return ip6_tnl_rcv(skb
, ETH_P_IP
, IPPROTO_IPIP
,
846 ip4ip6_dscp_ecn_decapsulate
);
849 static int ip6ip6_rcv(struct sk_buff
*skb
)
851 return ip6_tnl_rcv(skb
, ETH_P_IPV6
, IPPROTO_IPV6
,
852 ip6ip6_dscp_ecn_decapsulate
);
855 struct ipv6_tel_txoption
{
856 struct ipv6_txoptions ops
;
860 static void init_tel_txopt(struct ipv6_tel_txoption
*opt
, __u8 encap_limit
)
862 memset(opt
, 0, sizeof(struct ipv6_tel_txoption
));
864 opt
->dst_opt
[2] = IPV6_TLV_TNL_ENCAP_LIMIT
;
866 opt
->dst_opt
[4] = encap_limit
;
867 opt
->dst_opt
[5] = IPV6_TLV_PADN
;
870 opt
->ops
.dst0opt
= (struct ipv6_opt_hdr
*) opt
->dst_opt
;
871 opt
->ops
.opt_nflen
= 8;
875 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
876 * @t: the outgoing tunnel device
877 * @hdr: IPv6 header from the incoming packet
880 * Avoid trivial tunneling loop by checking that tunnel exit-point
881 * doesn't match source of incoming packet.
889 ip6_tnl_addr_conflict(const struct ip6_tnl
*t
, const struct ipv6hdr
*hdr
)
891 return ipv6_addr_equal(&t
->parms
.raddr
, &hdr
->saddr
);
894 int ip6_tnl_xmit_ctl(struct ip6_tnl
*t
)
896 struct __ip6_tnl_parm
*p
= &t
->parms
;
898 struct net
*net
= dev_net(t
->dev
);
900 if (p
->flags
& IP6_TNL_F_CAP_XMIT
) {
901 struct net_device
*ldev
= NULL
;
905 ldev
= dev_get_by_index_rcu(net
, p
->link
);
907 if (unlikely(!ipv6_chk_addr(net
, &p
->laddr
, ldev
, 0)))
908 pr_warn("%s xmit: Local address not yet configured!\n",
910 else if (!ipv6_addr_is_multicast(&p
->raddr
) &&
911 unlikely(ipv6_chk_addr(net
, &p
->raddr
, NULL
, 0)))
912 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n",
920 EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl
);
923 * ip6_tnl_xmit2 - encapsulate packet and send
924 * @skb: the outgoing socket buffer
925 * @dev: the outgoing tunnel device
926 * @dsfield: dscp code for outer header
927 * @fl: flow of tunneled packet
928 * @encap_limit: encapsulation limit
929 * @pmtu: Path MTU is stored if packet is too big
932 * Build new header and do some sanity checks on the packet before sending
938 * %-EMSGSIZE message too big. return mtu in this case.
941 static int ip6_tnl_xmit2(struct sk_buff
*skb
,
942 struct net_device
*dev
,
948 struct net
*net
= dev_net(dev
);
949 struct ip6_tnl
*t
= netdev_priv(dev
);
950 struct net_device_stats
*stats
= &t
->dev
->stats
;
951 struct ipv6hdr
*ipv6h
= ipv6_hdr(skb
);
952 struct ipv6_tel_txoption opt
;
953 struct dst_entry
*dst
= NULL
, *ndst
= NULL
;
954 struct net_device
*tdev
;
956 unsigned int max_headroom
= sizeof(struct ipv6hdr
);
960 if (!fl6
->flowi6_mark
)
961 dst
= ip6_tnl_dst_check(t
);
963 ndst
= ip6_route_output(net
, NULL
, fl6
);
966 goto tx_err_link_failure
;
967 ndst
= xfrm_lookup(net
, ndst
, flowi6_to_flowi(fl6
), NULL
, 0);
971 goto tx_err_link_failure
;
980 net_warn_ratelimited("%s: Local routing loop detected!\n",
982 goto tx_err_dst_release
;
984 mtu
= dst_mtu(dst
) - sizeof (*ipv6h
);
985 if (encap_limit
>= 0) {
989 if (mtu
< IPV6_MIN_MTU
)
992 skb_dst(skb
)->ops
->update_pmtu(skb_dst(skb
), NULL
, skb
, mtu
);
993 if (skb
->len
> mtu
) {
996 goto tx_err_dst_release
;
1000 * Okay, now see if we can stuff it in the buffer as-is.
1002 max_headroom
+= LL_RESERVED_SPACE(tdev
);
1004 if (skb_headroom(skb
) < max_headroom
|| skb_shared(skb
) ||
1005 (skb_cloned(skb
) && !skb_clone_writable(skb
, 0))) {
1006 struct sk_buff
*new_skb
;
1008 if (!(new_skb
= skb_realloc_headroom(skb
, max_headroom
)))
1009 goto tx_err_dst_release
;
1012 skb_set_owner_w(new_skb
, skb
->sk
);
1017 if (fl6
->flowi6_mark
) {
1018 skb_dst_set(skb
, dst
);
1021 skb_dst_set_noref(skb
, dst
);
1023 skb
->transport_header
= skb
->network_header
;
1025 proto
= fl6
->flowi6_proto
;
1026 if (encap_limit
>= 0) {
1027 init_tel_txopt(&opt
, encap_limit
);
1028 ipv6_push_nfrag_opts(skb
, &opt
.ops
, &proto
, NULL
);
1030 skb_push(skb
, sizeof(struct ipv6hdr
));
1031 skb_reset_network_header(skb
);
1032 ipv6h
= ipv6_hdr(skb
);
1033 ip6_flow_hdr(ipv6h
, INET_ECN_encapsulate(0, dsfield
), fl6
->flowlabel
);
1034 ipv6h
->hop_limit
= t
->parms
.hop_limit
;
1035 ipv6h
->nexthdr
= proto
;
1036 ipv6h
->saddr
= fl6
->saddr
;
1037 ipv6h
->daddr
= fl6
->daddr
;
1038 ip6tunnel_xmit(skb
, dev
);
1040 ip6_tnl_dst_store(t
, ndst
);
1042 tx_err_link_failure
:
1043 stats
->tx_carrier_errors
++;
1044 dst_link_failure(skb
);
1051 ip4ip6_tnl_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
1053 struct ip6_tnl
*t
= netdev_priv(dev
);
1054 const struct iphdr
*iph
= ip_hdr(skb
);
1055 int encap_limit
= -1;
1061 if ((t
->parms
.proto
!= IPPROTO_IPIP
&& t
->parms
.proto
!= 0) ||
1062 !ip6_tnl_xmit_ctl(t
))
1065 if (!(t
->parms
.flags
& IP6_TNL_F_IGN_ENCAP_LIMIT
))
1066 encap_limit
= t
->parms
.encap_limit
;
1068 memcpy(&fl6
, &t
->fl
.u
.ip6
, sizeof (fl6
));
1069 fl6
.flowi6_proto
= IPPROTO_IPIP
;
1071 dsfield
= ipv4_get_dsfield(iph
);
1073 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_TCLASS
)
1074 fl6
.flowlabel
|= htonl((__u32
)iph
->tos
<< IPV6_TCLASS_SHIFT
)
1076 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_FWMARK
)
1077 fl6
.flowi6_mark
= skb
->mark
;
1079 err
= ip6_tnl_xmit2(skb
, dev
, dsfield
, &fl6
, encap_limit
, &mtu
);
1081 /* XXX: send ICMP error even if DF is not set. */
1082 if (err
== -EMSGSIZE
)
1083 icmp_send(skb
, ICMP_DEST_UNREACH
, ICMP_FRAG_NEEDED
,
1092 ip6ip6_tnl_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
1094 struct ip6_tnl
*t
= netdev_priv(dev
);
1095 struct ipv6hdr
*ipv6h
= ipv6_hdr(skb
);
1096 int encap_limit
= -1;
1103 if ((t
->parms
.proto
!= IPPROTO_IPV6
&& t
->parms
.proto
!= 0) ||
1104 !ip6_tnl_xmit_ctl(t
) || ip6_tnl_addr_conflict(t
, ipv6h
))
1107 offset
= ip6_tnl_parse_tlv_enc_lim(skb
, skb_network_header(skb
));
1109 struct ipv6_tlv_tnl_enc_lim
*tel
;
1110 tel
= (struct ipv6_tlv_tnl_enc_lim
*)&skb_network_header(skb
)[offset
];
1111 if (tel
->encap_limit
== 0) {
1112 icmpv6_send(skb
, ICMPV6_PARAMPROB
,
1113 ICMPV6_HDR_FIELD
, offset
+ 2);
1116 encap_limit
= tel
->encap_limit
- 1;
1117 } else if (!(t
->parms
.flags
& IP6_TNL_F_IGN_ENCAP_LIMIT
))
1118 encap_limit
= t
->parms
.encap_limit
;
1120 memcpy(&fl6
, &t
->fl
.u
.ip6
, sizeof (fl6
));
1121 fl6
.flowi6_proto
= IPPROTO_IPV6
;
1123 dsfield
= ipv6_get_dsfield(ipv6h
);
1124 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_TCLASS
)
1125 fl6
.flowlabel
|= (*(__be32
*) ipv6h
& IPV6_TCLASS_MASK
);
1126 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_FLOWLABEL
)
1127 fl6
.flowlabel
|= (*(__be32
*) ipv6h
& IPV6_FLOWLABEL_MASK
);
1128 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_FWMARK
)
1129 fl6
.flowi6_mark
= skb
->mark
;
1131 err
= ip6_tnl_xmit2(skb
, dev
, dsfield
, &fl6
, encap_limit
, &mtu
);
1133 if (err
== -EMSGSIZE
)
1134 icmpv6_send(skb
, ICMPV6_PKT_TOOBIG
, 0, mtu
);
1142 ip6_tnl_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
1144 struct ip6_tnl
*t
= netdev_priv(dev
);
1145 struct net_device_stats
*stats
= &t
->dev
->stats
;
1148 switch (skb
->protocol
) {
1149 case htons(ETH_P_IP
):
1150 ret
= ip4ip6_tnl_xmit(skb
, dev
);
1152 case htons(ETH_P_IPV6
):
1153 ret
= ip6ip6_tnl_xmit(skb
, dev
);
1162 return NETDEV_TX_OK
;
1166 stats
->tx_dropped
++;
1168 return NETDEV_TX_OK
;
1171 static void ip6_tnl_link_config(struct ip6_tnl
*t
)
1173 struct net_device
*dev
= t
->dev
;
1174 struct __ip6_tnl_parm
*p
= &t
->parms
;
1175 struct flowi6
*fl6
= &t
->fl
.u
.ip6
;
1177 memcpy(dev
->dev_addr
, &p
->laddr
, sizeof(struct in6_addr
));
1178 memcpy(dev
->broadcast
, &p
->raddr
, sizeof(struct in6_addr
));
1180 /* Set up flowi template */
1181 fl6
->saddr
= p
->laddr
;
1182 fl6
->daddr
= p
->raddr
;
1183 fl6
->flowi6_oif
= p
->link
;
1186 if (!(p
->flags
&IP6_TNL_F_USE_ORIG_TCLASS
))
1187 fl6
->flowlabel
|= IPV6_TCLASS_MASK
& p
->flowinfo
;
1188 if (!(p
->flags
&IP6_TNL_F_USE_ORIG_FLOWLABEL
))
1189 fl6
->flowlabel
|= IPV6_FLOWLABEL_MASK
& p
->flowinfo
;
1191 p
->flags
&= ~(IP6_TNL_F_CAP_XMIT
|IP6_TNL_F_CAP_RCV
|IP6_TNL_F_CAP_PER_PACKET
);
1192 p
->flags
|= ip6_tnl_get_cap(t
, &p
->laddr
, &p
->raddr
);
1194 if (p
->flags
&IP6_TNL_F_CAP_XMIT
&& p
->flags
&IP6_TNL_F_CAP_RCV
)
1195 dev
->flags
|= IFF_POINTOPOINT
;
1197 dev
->flags
&= ~IFF_POINTOPOINT
;
1199 dev
->iflink
= p
->link
;
1201 if (p
->flags
& IP6_TNL_F_CAP_XMIT
) {
1202 int strict
= (ipv6_addr_type(&p
->raddr
) &
1203 (IPV6_ADDR_MULTICAST
|IPV6_ADDR_LINKLOCAL
));
1205 struct rt6_info
*rt
= rt6_lookup(dev_net(dev
),
1206 &p
->raddr
, &p
->laddr
,
1213 dev
->hard_header_len
= rt
->dst
.dev
->hard_header_len
+
1214 sizeof (struct ipv6hdr
);
1216 dev
->mtu
= rt
->dst
.dev
->mtu
- sizeof (struct ipv6hdr
);
1217 if (!(t
->parms
.flags
& IP6_TNL_F_IGN_ENCAP_LIMIT
))
1220 if (dev
->mtu
< IPV6_MIN_MTU
)
1221 dev
->mtu
= IPV6_MIN_MTU
;
1228 * ip6_tnl_change - update the tunnel parameters
1229 * @t: tunnel to be changed
1230 * @p: tunnel configuration parameters
1233 * ip6_tnl_change() updates the tunnel parameters
1237 ip6_tnl_change(struct ip6_tnl
*t
, const struct __ip6_tnl_parm
*p
)
1239 t
->parms
.laddr
= p
->laddr
;
1240 t
->parms
.raddr
= p
->raddr
;
1241 t
->parms
.flags
= p
->flags
;
1242 t
->parms
.hop_limit
= p
->hop_limit
;
1243 t
->parms
.encap_limit
= p
->encap_limit
;
1244 t
->parms
.flowinfo
= p
->flowinfo
;
1245 t
->parms
.link
= p
->link
;
1246 t
->parms
.proto
= p
->proto
;
1247 ip6_tnl_dst_reset(t
);
1248 ip6_tnl_link_config(t
);
1252 static int ip6_tnl_update(struct ip6_tnl
*t
, struct __ip6_tnl_parm
*p
)
1254 struct net
*net
= dev_net(t
->dev
);
1255 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
1258 ip6_tnl_unlink(ip6n
, t
);
1260 err
= ip6_tnl_change(t
, p
);
1261 ip6_tnl_link(ip6n
, t
);
1262 netdev_state_change(t
->dev
);
1267 ip6_tnl_parm_from_user(struct __ip6_tnl_parm
*p
, const struct ip6_tnl_parm
*u
)
1269 p
->laddr
= u
->laddr
;
1270 p
->raddr
= u
->raddr
;
1271 p
->flags
= u
->flags
;
1272 p
->hop_limit
= u
->hop_limit
;
1273 p
->encap_limit
= u
->encap_limit
;
1274 p
->flowinfo
= u
->flowinfo
;
1276 p
->proto
= u
->proto
;
1277 memcpy(p
->name
, u
->name
, sizeof(u
->name
));
1281 ip6_tnl_parm_to_user(struct ip6_tnl_parm
*u
, const struct __ip6_tnl_parm
*p
)
1283 u
->laddr
= p
->laddr
;
1284 u
->raddr
= p
->raddr
;
1285 u
->flags
= p
->flags
;
1286 u
->hop_limit
= p
->hop_limit
;
1287 u
->encap_limit
= p
->encap_limit
;
1288 u
->flowinfo
= p
->flowinfo
;
1290 u
->proto
= p
->proto
;
1291 memcpy(u
->name
, p
->name
, sizeof(u
->name
));
1295 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
1296 * @dev: virtual device associated with tunnel
1297 * @ifr: parameters passed from userspace
1298 * @cmd: command to be performed
1301 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
1304 * The possible commands are the following:
1305 * %SIOCGETTUNNEL: get tunnel parameters for device
1306 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1307 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1308 * %SIOCDELTUNNEL: delete tunnel
1310 * The fallback device "ip6tnl0", created during module
1311 * initialization, can be used for creating other tunnel devices.
1315 * %-EFAULT if unable to copy data to or from userspace,
1316 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1317 * %-EINVAL if passed tunnel parameters are invalid,
1318 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1319 * %-ENODEV if attempting to change or delete a nonexisting device
1323 ip6_tnl_ioctl(struct net_device
*dev
, struct ifreq
*ifr
, int cmd
)
1326 struct ip6_tnl_parm p
;
1327 struct __ip6_tnl_parm p1
;
1328 struct ip6_tnl
*t
= NULL
;
1329 struct net
*net
= dev_net(dev
);
1330 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
1334 if (dev
== ip6n
->fb_tnl_dev
) {
1335 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof (p
))) {
1339 ip6_tnl_parm_from_user(&p1
, &p
);
1340 t
= ip6_tnl_locate(net
, &p1
, 0);
1342 memset(&p
, 0, sizeof(p
));
1345 t
= netdev_priv(dev
);
1346 ip6_tnl_parm_to_user(&p
, &t
->parms
);
1347 if (copy_to_user(ifr
->ifr_ifru
.ifru_data
, &p
, sizeof (p
))) {
1354 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
1357 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof (p
)))
1360 if (p
.proto
!= IPPROTO_IPV6
&& p
.proto
!= IPPROTO_IPIP
&&
1363 ip6_tnl_parm_from_user(&p1
, &p
);
1364 t
= ip6_tnl_locate(net
, &p1
, cmd
== SIOCADDTUNNEL
);
1365 if (dev
!= ip6n
->fb_tnl_dev
&& cmd
== SIOCCHGTUNNEL
) {
1367 if (t
->dev
!= dev
) {
1372 t
= netdev_priv(dev
);
1374 err
= ip6_tnl_update(t
, &p1
);
1378 ip6_tnl_parm_to_user(&p
, &t
->parms
);
1379 if (copy_to_user(ifr
->ifr_ifru
.ifru_data
, &p
, sizeof(p
)))
1383 err
= (cmd
== SIOCADDTUNNEL
? -ENOBUFS
: -ENOENT
);
1387 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
1390 if (dev
== ip6n
->fb_tnl_dev
) {
1392 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof (p
)))
1395 ip6_tnl_parm_from_user(&p1
, &p
);
1396 t
= ip6_tnl_locate(net
, &p1
, 0);
1400 if (t
->dev
== ip6n
->fb_tnl_dev
)
1405 unregister_netdevice(dev
);
1414 * ip6_tnl_change_mtu - change mtu manually for tunnel device
1415 * @dev: virtual device associated with tunnel
1416 * @new_mtu: the new mtu
1420 * %-EINVAL if mtu too small
1424 ip6_tnl_change_mtu(struct net_device
*dev
, int new_mtu
)
1426 if (new_mtu
< IPV6_MIN_MTU
) {
1434 static const struct net_device_ops ip6_tnl_netdev_ops
= {
1435 .ndo_uninit
= ip6_tnl_dev_uninit
,
1436 .ndo_start_xmit
= ip6_tnl_xmit
,
1437 .ndo_do_ioctl
= ip6_tnl_ioctl
,
1438 .ndo_change_mtu
= ip6_tnl_change_mtu
,
1439 .ndo_get_stats
= ip6_get_stats
,
1444 * ip6_tnl_dev_setup - setup virtual tunnel device
1445 * @dev: virtual device associated with tunnel
1448 * Initialize function pointers and device parameters
1451 static void ip6_tnl_dev_setup(struct net_device
*dev
)
1455 dev
->netdev_ops
= &ip6_tnl_netdev_ops
;
1456 dev
->destructor
= ip6_dev_free
;
1458 dev
->type
= ARPHRD_TUNNEL6
;
1459 dev
->hard_header_len
= LL_MAX_HEADER
+ sizeof (struct ipv6hdr
);
1460 dev
->mtu
= ETH_DATA_LEN
- sizeof (struct ipv6hdr
);
1461 t
= netdev_priv(dev
);
1462 if (!(t
->parms
.flags
& IP6_TNL_F_IGN_ENCAP_LIMIT
))
1464 dev
->flags
|= IFF_NOARP
;
1465 dev
->addr_len
= sizeof(struct in6_addr
);
1466 dev
->features
|= NETIF_F_NETNS_LOCAL
;
1467 dev
->priv_flags
&= ~IFF_XMIT_DST_RELEASE
;
1472 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
1473 * @dev: virtual device associated with tunnel
1477 ip6_tnl_dev_init_gen(struct net_device
*dev
)
1479 struct ip6_tnl
*t
= netdev_priv(dev
);
1482 dev
->tstats
= alloc_percpu(struct pcpu_tstats
);
1489 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
1490 * @dev: virtual device associated with tunnel
1493 static int ip6_tnl_dev_init(struct net_device
*dev
)
1495 struct ip6_tnl
*t
= netdev_priv(dev
);
1496 int err
= ip6_tnl_dev_init_gen(dev
);
1500 ip6_tnl_link_config(t
);
1505 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
1506 * @dev: fallback device
1511 static int __net_init
ip6_fb_tnl_dev_init(struct net_device
*dev
)
1513 struct ip6_tnl
*t
= netdev_priv(dev
);
1514 struct net
*net
= dev_net(dev
);
1515 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
1516 int err
= ip6_tnl_dev_init_gen(dev
);
1521 t
->parms
.proto
= IPPROTO_IPV6
;
1524 ip6_tnl_link_config(t
);
1526 rcu_assign_pointer(ip6n
->tnls_wc
[0], t
);
1530 static int ip6_tnl_validate(struct nlattr
*tb
[], struct nlattr
*data
[])
1537 proto
= nla_get_u8(data
[IFLA_IPTUN_PROTO
]);
1538 if (proto
!= IPPROTO_IPV6
&&
1539 proto
!= IPPROTO_IPIP
&&
1546 static void ip6_tnl_netlink_parms(struct nlattr
*data
[],
1547 struct __ip6_tnl_parm
*parms
)
1549 memset(parms
, 0, sizeof(*parms
));
1554 if (data
[IFLA_IPTUN_LINK
])
1555 parms
->link
= nla_get_u32(data
[IFLA_IPTUN_LINK
]);
1557 if (data
[IFLA_IPTUN_LOCAL
])
1558 nla_memcpy(&parms
->laddr
, data
[IFLA_IPTUN_LOCAL
],
1559 sizeof(struct in6_addr
));
1561 if (data
[IFLA_IPTUN_REMOTE
])
1562 nla_memcpy(&parms
->raddr
, data
[IFLA_IPTUN_REMOTE
],
1563 sizeof(struct in6_addr
));
1565 if (data
[IFLA_IPTUN_TTL
])
1566 parms
->hop_limit
= nla_get_u8(data
[IFLA_IPTUN_TTL
]);
1568 if (data
[IFLA_IPTUN_ENCAP_LIMIT
])
1569 parms
->encap_limit
= nla_get_u8(data
[IFLA_IPTUN_ENCAP_LIMIT
]);
1571 if (data
[IFLA_IPTUN_FLOWINFO
])
1572 parms
->flowinfo
= nla_get_be32(data
[IFLA_IPTUN_FLOWINFO
]);
1574 if (data
[IFLA_IPTUN_FLAGS
])
1575 parms
->flags
= nla_get_u32(data
[IFLA_IPTUN_FLAGS
]);
1577 if (data
[IFLA_IPTUN_PROTO
])
1578 parms
->proto
= nla_get_u8(data
[IFLA_IPTUN_PROTO
]);
1581 static int ip6_tnl_newlink(struct net
*src_net
, struct net_device
*dev
,
1582 struct nlattr
*tb
[], struct nlattr
*data
[])
1584 struct net
*net
= dev_net(dev
);
1587 nt
= netdev_priv(dev
);
1588 ip6_tnl_netlink_parms(data
, &nt
->parms
);
1590 if (ip6_tnl_locate(net
, &nt
->parms
, 0))
1593 return ip6_tnl_create2(dev
);
1596 static int ip6_tnl_changelink(struct net_device
*dev
, struct nlattr
*tb
[],
1597 struct nlattr
*data
[])
1600 struct __ip6_tnl_parm p
;
1601 struct net
*net
= dev_net(dev
);
1602 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
1604 if (dev
== ip6n
->fb_tnl_dev
)
1607 ip6_tnl_netlink_parms(data
, &p
);
1609 t
= ip6_tnl_locate(net
, &p
, 0);
1615 t
= netdev_priv(dev
);
1617 return ip6_tnl_update(t
, &p
);
1620 static size_t ip6_tnl_get_size(const struct net_device
*dev
)
1623 /* IFLA_IPTUN_LINK */
1625 /* IFLA_IPTUN_LOCAL */
1626 nla_total_size(sizeof(struct in6_addr
)) +
1627 /* IFLA_IPTUN_REMOTE */
1628 nla_total_size(sizeof(struct in6_addr
)) +
1629 /* IFLA_IPTUN_TTL */
1631 /* IFLA_IPTUN_ENCAP_LIMIT */
1633 /* IFLA_IPTUN_FLOWINFO */
1635 /* IFLA_IPTUN_FLAGS */
1637 /* IFLA_IPTUN_PROTO */
1642 static int ip6_tnl_fill_info(struct sk_buff
*skb
, const struct net_device
*dev
)
1644 struct ip6_tnl
*tunnel
= netdev_priv(dev
);
1645 struct __ip6_tnl_parm
*parm
= &tunnel
->parms
;
1647 if (nla_put_u32(skb
, IFLA_IPTUN_LINK
, parm
->link
) ||
1648 nla_put(skb
, IFLA_IPTUN_LOCAL
, sizeof(struct in6_addr
),
1650 nla_put(skb
, IFLA_IPTUN_REMOTE
, sizeof(struct in6_addr
),
1652 nla_put_u8(skb
, IFLA_IPTUN_TTL
, parm
->hop_limit
) ||
1653 nla_put_u8(skb
, IFLA_IPTUN_ENCAP_LIMIT
, parm
->encap_limit
) ||
1654 nla_put_be32(skb
, IFLA_IPTUN_FLOWINFO
, parm
->flowinfo
) ||
1655 nla_put_u32(skb
, IFLA_IPTUN_FLAGS
, parm
->flags
) ||
1656 nla_put_u8(skb
, IFLA_IPTUN_PROTO
, parm
->proto
))
1657 goto nla_put_failure
;
1664 static const struct nla_policy ip6_tnl_policy
[IFLA_IPTUN_MAX
+ 1] = {
1665 [IFLA_IPTUN_LINK
] = { .type
= NLA_U32
},
1666 [IFLA_IPTUN_LOCAL
] = { .len
= sizeof(struct in6_addr
) },
1667 [IFLA_IPTUN_REMOTE
] = { .len
= sizeof(struct in6_addr
) },
1668 [IFLA_IPTUN_TTL
] = { .type
= NLA_U8
},
1669 [IFLA_IPTUN_ENCAP_LIMIT
] = { .type
= NLA_U8
},
1670 [IFLA_IPTUN_FLOWINFO
] = { .type
= NLA_U32
},
1671 [IFLA_IPTUN_FLAGS
] = { .type
= NLA_U32
},
1672 [IFLA_IPTUN_PROTO
] = { .type
= NLA_U8
},
1675 static struct rtnl_link_ops ip6_link_ops __read_mostly
= {
1677 .maxtype
= IFLA_IPTUN_MAX
,
1678 .policy
= ip6_tnl_policy
,
1679 .priv_size
= sizeof(struct ip6_tnl
),
1680 .setup
= ip6_tnl_dev_setup
,
1681 .validate
= ip6_tnl_validate
,
1682 .newlink
= ip6_tnl_newlink
,
1683 .changelink
= ip6_tnl_changelink
,
1684 .get_size
= ip6_tnl_get_size
,
1685 .fill_info
= ip6_tnl_fill_info
,
1688 static struct xfrm6_tunnel ip4ip6_handler __read_mostly
= {
1689 .handler
= ip4ip6_rcv
,
1690 .err_handler
= ip4ip6_err
,
1694 static struct xfrm6_tunnel ip6ip6_handler __read_mostly
= {
1695 .handler
= ip6ip6_rcv
,
1696 .err_handler
= ip6ip6_err
,
1700 static void __net_exit
ip6_tnl_destroy_tunnels(struct ip6_tnl_net
*ip6n
)
1706 for (h
= 0; h
< HASH_SIZE
; h
++) {
1707 t
= rtnl_dereference(ip6n
->tnls_r_l
[h
]);
1709 unregister_netdevice_queue(t
->dev
, &list
);
1710 t
= rtnl_dereference(t
->next
);
1714 t
= rtnl_dereference(ip6n
->tnls_wc
[0]);
1715 unregister_netdevice_queue(t
->dev
, &list
);
1716 unregister_netdevice_many(&list
);
1719 static int __net_init
ip6_tnl_init_net(struct net
*net
)
1721 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
1722 struct ip6_tnl
*t
= NULL
;
1725 ip6n
->tnls
[0] = ip6n
->tnls_wc
;
1726 ip6n
->tnls
[1] = ip6n
->tnls_r_l
;
1729 ip6n
->fb_tnl_dev
= alloc_netdev(sizeof(struct ip6_tnl
), "ip6tnl0",
1732 if (!ip6n
->fb_tnl_dev
)
1734 dev_net_set(ip6n
->fb_tnl_dev
, net
);
1736 err
= ip6_fb_tnl_dev_init(ip6n
->fb_tnl_dev
);
1740 err
= register_netdev(ip6n
->fb_tnl_dev
);
1744 t
= netdev_priv(ip6n
->fb_tnl_dev
);
1746 strcpy(t
->parms
.name
, ip6n
->fb_tnl_dev
->name
);
1750 ip6_dev_free(ip6n
->fb_tnl_dev
);
1755 static void __net_exit
ip6_tnl_exit_net(struct net
*net
)
1757 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
1760 ip6_tnl_destroy_tunnels(ip6n
);
1764 static struct pernet_operations ip6_tnl_net_ops
= {
1765 .init
= ip6_tnl_init_net
,
1766 .exit
= ip6_tnl_exit_net
,
1767 .id
= &ip6_tnl_net_id
,
1768 .size
= sizeof(struct ip6_tnl_net
),
1772 * ip6_tunnel_init - register protocol and reserve needed resources
1774 * Return: 0 on success
1777 static int __init
ip6_tunnel_init(void)
1781 err
= register_pernet_device(&ip6_tnl_net_ops
);
1785 err
= xfrm6_tunnel_register(&ip4ip6_handler
, AF_INET
);
1787 pr_err("%s: can't register ip4ip6\n", __func__
);
1791 err
= xfrm6_tunnel_register(&ip6ip6_handler
, AF_INET6
);
1793 pr_err("%s: can't register ip6ip6\n", __func__
);
1796 err
= rtnl_link_register(&ip6_link_ops
);
1798 goto rtnl_link_failed
;
1803 xfrm6_tunnel_deregister(&ip6ip6_handler
, AF_INET6
);
1805 xfrm6_tunnel_deregister(&ip4ip6_handler
, AF_INET
);
1807 unregister_pernet_device(&ip6_tnl_net_ops
);
1813 * ip6_tunnel_cleanup - free resources and unregister protocol
1816 static void __exit
ip6_tunnel_cleanup(void)
1818 rtnl_link_unregister(&ip6_link_ops
);
1819 if (xfrm6_tunnel_deregister(&ip4ip6_handler
, AF_INET
))
1820 pr_info("%s: can't deregister ip4ip6\n", __func__
);
1822 if (xfrm6_tunnel_deregister(&ip6ip6_handler
, AF_INET6
))
1823 pr_info("%s: can't deregister ip6ip6\n", __func__
);
1825 unregister_pernet_device(&ip6_tnl_net_ops
);
1828 module_init(ip6_tunnel_init
);
1829 module_exit(ip6_tunnel_cleanup
);