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/net.h>
33 #include <linux/in6.h>
34 #include <linux/netdevice.h>
35 #include <linux/if_arp.h>
36 #include <linux/icmpv6.h>
37 #include <linux/init.h>
38 #include <linux/route.h>
39 #include <linux/rtnetlink.h>
40 #include <linux/netfilter_ipv6.h>
41 #include <linux/slab.h>
42 #include <linux/hash.h>
43 #include <linux/etherdevice.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_RTNL_LINK("ip6tnl");
65 MODULE_ALIAS_NETDEV("ip6tnl0");
68 #define IP6_TNL_TRACE(x...) pr_debug("%s:" x "\n", __func__)
70 #define IP6_TNL_TRACE(x...) do {;} while(0)
73 #define HASH_SIZE_SHIFT 5
74 #define HASH_SIZE (1 << HASH_SIZE_SHIFT)
76 static bool log_ecn_error
= true;
77 module_param(log_ecn_error
, bool, 0644);
78 MODULE_PARM_DESC(log_ecn_error
, "Log packets received with corrupted ECN");
80 static u32
HASH(const struct in6_addr
*addr1
, const struct in6_addr
*addr2
)
82 u32 hash
= ipv6_addr_hash(addr1
) ^ ipv6_addr_hash(addr2
);
84 return hash_32(hash
, HASH_SIZE_SHIFT
);
87 static int ip6_tnl_dev_init(struct net_device
*dev
);
88 static void ip6_tnl_dev_setup(struct net_device
*dev
);
89 static struct rtnl_link_ops ip6_link_ops __read_mostly
;
91 static int ip6_tnl_net_id __read_mostly
;
93 /* the IPv6 tunnel fallback device */
94 struct net_device
*fb_tnl_dev
;
95 /* lists for storing tunnels in use */
96 struct ip6_tnl __rcu
*tnls_r_l
[HASH_SIZE
];
97 struct ip6_tnl __rcu
*tnls_wc
[1];
98 struct ip6_tnl __rcu
**tnls
[2];
101 static struct net_device_stats
*ip6_get_stats(struct net_device
*dev
)
103 struct pcpu_sw_netstats tmp
, sum
= { 0 };
106 for_each_possible_cpu(i
) {
108 const struct pcpu_sw_netstats
*tstats
=
109 per_cpu_ptr(dev
->tstats
, i
);
112 start
= u64_stats_fetch_begin_irq(&tstats
->syncp
);
113 tmp
.rx_packets
= tstats
->rx_packets
;
114 tmp
.rx_bytes
= tstats
->rx_bytes
;
115 tmp
.tx_packets
= tstats
->tx_packets
;
116 tmp
.tx_bytes
= tstats
->tx_bytes
;
117 } while (u64_stats_fetch_retry_irq(&tstats
->syncp
, start
));
119 sum
.rx_packets
+= tmp
.rx_packets
;
120 sum
.rx_bytes
+= tmp
.rx_bytes
;
121 sum
.tx_packets
+= tmp
.tx_packets
;
122 sum
.tx_bytes
+= tmp
.tx_bytes
;
124 dev
->stats
.rx_packets
= sum
.rx_packets
;
125 dev
->stats
.rx_bytes
= sum
.rx_bytes
;
126 dev
->stats
.tx_packets
= sum
.tx_packets
;
127 dev
->stats
.tx_bytes
= sum
.tx_bytes
;
132 * Locking : hash tables are protected by RCU and RTNL
135 struct dst_entry
*ip6_tnl_dst_check(struct ip6_tnl
*t
)
137 struct dst_entry
*dst
= t
->dst_cache
;
139 if (dst
&& dst
->obsolete
&&
140 dst
->ops
->check(dst
, t
->dst_cookie
) == NULL
) {
148 EXPORT_SYMBOL_GPL(ip6_tnl_dst_check
);
150 void ip6_tnl_dst_reset(struct ip6_tnl
*t
)
152 dst_release(t
->dst_cache
);
155 EXPORT_SYMBOL_GPL(ip6_tnl_dst_reset
);
157 void ip6_tnl_dst_store(struct ip6_tnl
*t
, struct dst_entry
*dst
)
159 struct rt6_info
*rt
= (struct rt6_info
*) dst
;
160 t
->dst_cookie
= rt
->rt6i_node
? rt
->rt6i_node
->fn_sernum
: 0;
161 dst_release(t
->dst_cache
);
164 EXPORT_SYMBOL_GPL(ip6_tnl_dst_store
);
167 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
168 * @remote: the address of the tunnel exit-point
169 * @local: the address of the tunnel entry-point
172 * tunnel matching given end-points if found,
173 * else fallback tunnel if its device is up,
177 #define for_each_ip6_tunnel_rcu(start) \
178 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
180 static struct ip6_tnl
*
181 ip6_tnl_lookup(struct net
*net
, const struct in6_addr
*remote
, const struct in6_addr
*local
)
183 unsigned int hash
= HASH(remote
, local
);
185 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
187 for_each_ip6_tunnel_rcu(ip6n
->tnls_r_l
[hash
]) {
188 if (ipv6_addr_equal(local
, &t
->parms
.laddr
) &&
189 ipv6_addr_equal(remote
, &t
->parms
.raddr
) &&
190 (t
->dev
->flags
& IFF_UP
))
193 t
= rcu_dereference(ip6n
->tnls_wc
[0]);
194 if (t
&& (t
->dev
->flags
& IFF_UP
))
201 * ip6_tnl_bucket - get head of list matching given tunnel parameters
202 * @p: parameters containing tunnel end-points
205 * ip6_tnl_bucket() returns the head of the list matching the
206 * &struct in6_addr entries laddr and raddr in @p.
208 * Return: head of IPv6 tunnel list
211 static struct ip6_tnl __rcu
**
212 ip6_tnl_bucket(struct ip6_tnl_net
*ip6n
, const struct __ip6_tnl_parm
*p
)
214 const struct in6_addr
*remote
= &p
->raddr
;
215 const struct in6_addr
*local
= &p
->laddr
;
219 if (!ipv6_addr_any(remote
) || !ipv6_addr_any(local
)) {
221 h
= HASH(remote
, local
);
223 return &ip6n
->tnls
[prio
][h
];
227 * ip6_tnl_link - add tunnel to hash table
228 * @t: tunnel to be added
232 ip6_tnl_link(struct ip6_tnl_net
*ip6n
, struct ip6_tnl
*t
)
234 struct ip6_tnl __rcu
**tp
= ip6_tnl_bucket(ip6n
, &t
->parms
);
236 rcu_assign_pointer(t
->next
, rtnl_dereference(*tp
));
237 rcu_assign_pointer(*tp
, t
);
241 * ip6_tnl_unlink - remove tunnel from hash table
242 * @t: tunnel to be removed
246 ip6_tnl_unlink(struct ip6_tnl_net
*ip6n
, struct ip6_tnl
*t
)
248 struct ip6_tnl __rcu
**tp
;
249 struct ip6_tnl
*iter
;
251 for (tp
= ip6_tnl_bucket(ip6n
, &t
->parms
);
252 (iter
= rtnl_dereference(*tp
)) != NULL
;
255 rcu_assign_pointer(*tp
, t
->next
);
261 static void ip6_dev_free(struct net_device
*dev
)
263 free_percpu(dev
->tstats
);
267 static int ip6_tnl_create2(struct net_device
*dev
)
269 struct ip6_tnl
*t
= netdev_priv(dev
);
270 struct net
*net
= dev_net(dev
);
271 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
274 t
= netdev_priv(dev
);
275 err
= ip6_tnl_dev_init(dev
);
279 err
= register_netdevice(dev
);
283 strcpy(t
->parms
.name
, dev
->name
);
284 dev
->rtnl_link_ops
= &ip6_link_ops
;
287 ip6_tnl_link(ip6n
, t
);
295 * ip6_tnl_create - create a new tunnel
296 * @p: tunnel parameters
297 * @pt: pointer to new tunnel
300 * Create tunnel matching given parameters.
303 * created tunnel or NULL
306 static struct ip6_tnl
*ip6_tnl_create(struct net
*net
, struct __ip6_tnl_parm
*p
)
308 struct net_device
*dev
;
314 strlcpy(name
, p
->name
, IFNAMSIZ
);
316 sprintf(name
, "ip6tnl%%d");
318 dev
= alloc_netdev(sizeof(*t
), name
, NET_NAME_UNKNOWN
,
323 dev_net_set(dev
, net
);
325 t
= netdev_priv(dev
);
327 t
->net
= dev_net(dev
);
328 err
= ip6_tnl_create2(dev
);
341 * ip6_tnl_locate - find or create tunnel matching given parameters
342 * @p: tunnel parameters
343 * @create: != 0 if allowed to create new tunnel if no match found
346 * ip6_tnl_locate() first tries to locate an existing tunnel
347 * based on @parms. If this is unsuccessful, but @create is set a new
348 * tunnel device is created and registered for use.
351 * matching tunnel or NULL
354 static struct ip6_tnl
*ip6_tnl_locate(struct net
*net
,
355 struct __ip6_tnl_parm
*p
, int create
)
357 const struct in6_addr
*remote
= &p
->raddr
;
358 const struct in6_addr
*local
= &p
->laddr
;
359 struct ip6_tnl __rcu
**tp
;
361 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
363 for (tp
= ip6_tnl_bucket(ip6n
, p
);
364 (t
= rtnl_dereference(*tp
)) != NULL
;
366 if (ipv6_addr_equal(local
, &t
->parms
.laddr
) &&
367 ipv6_addr_equal(remote
, &t
->parms
.raddr
)) {
376 return ip6_tnl_create(net
, p
);
380 * ip6_tnl_dev_uninit - tunnel device uninitializer
381 * @dev: the device to be destroyed
384 * ip6_tnl_dev_uninit() removes tunnel from its list
388 ip6_tnl_dev_uninit(struct net_device
*dev
)
390 struct ip6_tnl
*t
= netdev_priv(dev
);
391 struct net
*net
= t
->net
;
392 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
394 if (dev
== ip6n
->fb_tnl_dev
)
395 RCU_INIT_POINTER(ip6n
->tnls_wc
[0], NULL
);
397 ip6_tnl_unlink(ip6n
, t
);
398 ip6_tnl_dst_reset(t
);
403 * parse_tvl_tnl_enc_lim - handle encapsulation limit option
404 * @skb: received socket buffer
407 * 0 if none was found,
408 * else index to encapsulation limit
411 __u16
ip6_tnl_parse_tlv_enc_lim(struct sk_buff
*skb
, __u8
*raw
)
413 const struct ipv6hdr
*ipv6h
= (const struct ipv6hdr
*) raw
;
414 __u8 nexthdr
= ipv6h
->nexthdr
;
415 __u16 off
= sizeof(*ipv6h
);
417 while (ipv6_ext_hdr(nexthdr
) && nexthdr
!= NEXTHDR_NONE
) {
419 struct ipv6_opt_hdr
*hdr
;
420 if (raw
+ off
+ sizeof(*hdr
) > skb
->data
&&
421 !pskb_may_pull(skb
, raw
- skb
->data
+ off
+ sizeof (*hdr
)))
424 hdr
= (struct ipv6_opt_hdr
*) (raw
+ off
);
425 if (nexthdr
== NEXTHDR_FRAGMENT
) {
426 struct frag_hdr
*frag_hdr
= (struct frag_hdr
*) hdr
;
427 if (frag_hdr
->frag_off
)
430 } else if (nexthdr
== NEXTHDR_AUTH
) {
431 optlen
= (hdr
->hdrlen
+ 2) << 2;
433 optlen
= ipv6_optlen(hdr
);
435 if (nexthdr
== NEXTHDR_DEST
) {
438 struct ipv6_tlv_tnl_enc_lim
*tel
;
440 /* No more room for encapsulation limit */
441 if (i
+ sizeof (*tel
) > off
+ optlen
)
444 tel
= (struct ipv6_tlv_tnl_enc_lim
*) &raw
[i
];
445 /* return index of option if found and valid */
446 if (tel
->type
== IPV6_TLV_TNL_ENCAP_LIMIT
&&
449 /* else jump to next option */
451 i
+= tel
->length
+ 2;
456 nexthdr
= hdr
->nexthdr
;
461 EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim
);
464 * ip6_tnl_err - tunnel error handler
467 * ip6_tnl_err() should handle errors in the tunnel according
468 * to the specifications in RFC 2473.
472 ip6_tnl_err(struct sk_buff
*skb
, __u8 ipproto
, struct inet6_skb_parm
*opt
,
473 u8
*type
, u8
*code
, int *msg
, __u32
*info
, int offset
)
475 const struct ipv6hdr
*ipv6h
= (const struct ipv6hdr
*) skb
->data
;
478 u8 rel_type
= ICMPV6_DEST_UNREACH
;
479 u8 rel_code
= ICMPV6_ADDR_UNREACH
;
484 /* If the packet doesn't contain the original IPv6 header we are
485 in trouble since we might need the source address for further
486 processing of the error. */
489 if ((t
= ip6_tnl_lookup(dev_net(skb
->dev
), &ipv6h
->daddr
,
490 &ipv6h
->saddr
)) == NULL
)
493 if (t
->parms
.proto
!= ipproto
&& t
->parms
.proto
!= 0)
500 struct ipv6_tlv_tnl_enc_lim
*tel
;
502 case ICMPV6_DEST_UNREACH
:
503 net_warn_ratelimited("%s: Path to destination invalid or inactive!\n",
507 case ICMPV6_TIME_EXCEED
:
508 if ((*code
) == ICMPV6_EXC_HOPLIMIT
) {
509 net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
514 case ICMPV6_PARAMPROB
:
516 if ((*code
) == ICMPV6_HDR_FIELD
)
517 teli
= ip6_tnl_parse_tlv_enc_lim(skb
, skb
->data
);
519 if (teli
&& teli
== *info
- 2) {
520 tel
= (struct ipv6_tlv_tnl_enc_lim
*) &skb
->data
[teli
];
521 if (tel
->encap_limit
== 0) {
522 net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
527 net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
531 case ICMPV6_PKT_TOOBIG
:
532 mtu
= *info
- offset
;
533 if (mtu
< IPV6_MIN_MTU
)
537 if ((len
= sizeof(*ipv6h
) + ntohs(ipv6h
->payload_len
)) > mtu
) {
538 rel_type
= ICMPV6_PKT_TOOBIG
;
557 ip4ip6_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
558 u8 type
, u8 code
, int offset
, __be32 info
)
563 __u32 rel_info
= ntohl(info
);
565 struct sk_buff
*skb2
;
566 const struct iphdr
*eiph
;
570 err
= ip6_tnl_err(skb
, IPPROTO_IPIP
, opt
, &rel_type
, &rel_code
,
571 &rel_msg
, &rel_info
, offset
);
579 case ICMPV6_DEST_UNREACH
:
580 if (rel_code
!= ICMPV6_ADDR_UNREACH
)
582 rel_type
= ICMP_DEST_UNREACH
;
583 rel_code
= ICMP_HOST_UNREACH
;
585 case ICMPV6_PKT_TOOBIG
:
588 rel_type
= ICMP_DEST_UNREACH
;
589 rel_code
= ICMP_FRAG_NEEDED
;
592 rel_type
= ICMP_REDIRECT
;
593 rel_code
= ICMP_REDIR_HOST
;
598 if (!pskb_may_pull(skb
, offset
+ sizeof(struct iphdr
)))
601 skb2
= skb_clone(skb
, GFP_ATOMIC
);
607 skb_pull(skb2
, offset
);
608 skb_reset_network_header(skb2
);
611 /* Try to guess incoming interface */
612 rt
= ip_route_output_ports(dev_net(skb
->dev
), &fl4
, NULL
,
615 IPPROTO_IPIP
, RT_TOS(eiph
->tos
), 0);
619 skb2
->dev
= rt
->dst
.dev
;
621 /* route "incoming" packet */
622 if (rt
->rt_flags
& RTCF_LOCAL
) {
625 rt
= ip_route_output_ports(dev_net(skb
->dev
), &fl4
, NULL
,
626 eiph
->daddr
, eiph
->saddr
,
629 RT_TOS(eiph
->tos
), 0);
631 rt
->dst
.dev
->type
!= ARPHRD_TUNNEL
) {
636 skb_dst_set(skb2
, &rt
->dst
);
639 if (ip_route_input(skb2
, eiph
->daddr
, eiph
->saddr
, eiph
->tos
,
641 skb_dst(skb2
)->dev
->type
!= ARPHRD_TUNNEL
)
645 /* change mtu on this route */
646 if (rel_type
== ICMP_DEST_UNREACH
&& rel_code
== ICMP_FRAG_NEEDED
) {
647 if (rel_info
> dst_mtu(skb_dst(skb2
)))
650 skb_dst(skb2
)->ops
->update_pmtu(skb_dst(skb2
), NULL
, skb2
, rel_info
);
652 if (rel_type
== ICMP_REDIRECT
)
653 skb_dst(skb2
)->ops
->redirect(skb_dst(skb2
), NULL
, skb2
);
655 icmp_send(skb2
, rel_type
, rel_code
, htonl(rel_info
));
663 ip6ip6_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
664 u8 type
, u8 code
, int offset
, __be32 info
)
669 __u32 rel_info
= ntohl(info
);
672 err
= ip6_tnl_err(skb
, IPPROTO_IPV6
, opt
, &rel_type
, &rel_code
,
673 &rel_msg
, &rel_info
, offset
);
677 if (rel_msg
&& pskb_may_pull(skb
, offset
+ sizeof(struct ipv6hdr
))) {
679 struct sk_buff
*skb2
= skb_clone(skb
, GFP_ATOMIC
);
685 skb_pull(skb2
, offset
);
686 skb_reset_network_header(skb2
);
688 /* Try to guess incoming interface */
689 rt
= rt6_lookup(dev_net(skb
->dev
), &ipv6_hdr(skb2
)->saddr
,
692 if (rt
&& rt
->dst
.dev
)
693 skb2
->dev
= rt
->dst
.dev
;
695 icmpv6_send(skb2
, rel_type
, rel_code
, rel_info
);
705 static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl
*t
,
706 const struct ipv6hdr
*ipv6h
,
709 __u8 dsfield
= ipv6_get_dsfield(ipv6h
) & ~INET_ECN_MASK
;
711 if (t
->parms
.flags
& IP6_TNL_F_RCV_DSCP_COPY
)
712 ipv4_change_dsfield(ip_hdr(skb
), INET_ECN_MASK
, dsfield
);
714 return IP6_ECN_decapsulate(ipv6h
, skb
);
717 static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl
*t
,
718 const struct ipv6hdr
*ipv6h
,
721 if (t
->parms
.flags
& IP6_TNL_F_RCV_DSCP_COPY
)
722 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h
), ipv6_hdr(skb
));
724 return IP6_ECN_decapsulate(ipv6h
, skb
);
727 __u32
ip6_tnl_get_cap(struct ip6_tnl
*t
,
728 const struct in6_addr
*laddr
,
729 const struct in6_addr
*raddr
)
731 struct __ip6_tnl_parm
*p
= &t
->parms
;
732 int ltype
= ipv6_addr_type(laddr
);
733 int rtype
= ipv6_addr_type(raddr
);
736 if (ltype
== IPV6_ADDR_ANY
|| rtype
== IPV6_ADDR_ANY
) {
737 flags
= IP6_TNL_F_CAP_PER_PACKET
;
738 } else if (ltype
& (IPV6_ADDR_UNICAST
|IPV6_ADDR_MULTICAST
) &&
739 rtype
& (IPV6_ADDR_UNICAST
|IPV6_ADDR_MULTICAST
) &&
740 !((ltype
|rtype
) & IPV6_ADDR_LOOPBACK
) &&
741 (!((ltype
|rtype
) & IPV6_ADDR_LINKLOCAL
) || p
->link
)) {
742 if (ltype
&IPV6_ADDR_UNICAST
)
743 flags
|= IP6_TNL_F_CAP_XMIT
;
744 if (rtype
&IPV6_ADDR_UNICAST
)
745 flags
|= IP6_TNL_F_CAP_RCV
;
749 EXPORT_SYMBOL(ip6_tnl_get_cap
);
751 /* called with rcu_read_lock() */
752 int ip6_tnl_rcv_ctl(struct ip6_tnl
*t
,
753 const struct in6_addr
*laddr
,
754 const struct in6_addr
*raddr
)
756 struct __ip6_tnl_parm
*p
= &t
->parms
;
758 struct net
*net
= t
->net
;
760 if ((p
->flags
& IP6_TNL_F_CAP_RCV
) ||
761 ((p
->flags
& IP6_TNL_F_CAP_PER_PACKET
) &&
762 (ip6_tnl_get_cap(t
, laddr
, raddr
) & IP6_TNL_F_CAP_RCV
))) {
763 struct net_device
*ldev
= NULL
;
766 ldev
= dev_get_by_index_rcu(net
, p
->link
);
768 if ((ipv6_addr_is_multicast(laddr
) ||
769 likely(ipv6_chk_addr(net
, laddr
, ldev
, 0))) &&
770 likely(!ipv6_chk_addr(net
, raddr
, NULL
, 0)))
775 EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl
);
778 * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally
779 * @skb: received socket buffer
780 * @protocol: ethernet protocol ID
781 * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN
786 static int ip6_tnl_rcv(struct sk_buff
*skb
, __u16 protocol
,
788 int (*dscp_ecn_decapsulate
)(const struct ip6_tnl
*t
,
789 const struct ipv6hdr
*ipv6h
,
790 struct sk_buff
*skb
))
793 const struct ipv6hdr
*ipv6h
= ipv6_hdr(skb
);
798 if ((t
= ip6_tnl_lookup(dev_net(skb
->dev
), &ipv6h
->saddr
,
799 &ipv6h
->daddr
)) != NULL
) {
800 struct pcpu_sw_netstats
*tstats
;
802 if (t
->parms
.proto
!= ipproto
&& t
->parms
.proto
!= 0) {
807 if (!xfrm6_policy_check(NULL
, XFRM_POLICY_IN
, skb
)) {
812 if (!ip6_tnl_rcv_ctl(t
, &ipv6h
->daddr
, &ipv6h
->saddr
)) {
813 t
->dev
->stats
.rx_dropped
++;
817 skb
->mac_header
= skb
->network_header
;
818 skb_reset_network_header(skb
);
819 skb
->protocol
= htons(protocol
);
820 memset(skb
->cb
, 0, sizeof(struct inet6_skb_parm
));
822 __skb_tunnel_rx(skb
, t
->dev
, t
->net
);
824 err
= dscp_ecn_decapsulate(t
, ipv6h
, skb
);
827 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
829 ipv6_get_dsfield(ipv6h
));
831 ++t
->dev
->stats
.rx_frame_errors
;
832 ++t
->dev
->stats
.rx_errors
;
838 tstats
= this_cpu_ptr(t
->dev
->tstats
);
839 u64_stats_update_begin(&tstats
->syncp
);
840 tstats
->rx_packets
++;
841 tstats
->rx_bytes
+= skb
->len
;
842 u64_stats_update_end(&tstats
->syncp
);
857 static int ip4ip6_rcv(struct sk_buff
*skb
)
859 return ip6_tnl_rcv(skb
, ETH_P_IP
, IPPROTO_IPIP
,
860 ip4ip6_dscp_ecn_decapsulate
);
863 static int ip6ip6_rcv(struct sk_buff
*skb
)
865 return ip6_tnl_rcv(skb
, ETH_P_IPV6
, IPPROTO_IPV6
,
866 ip6ip6_dscp_ecn_decapsulate
);
869 struct ipv6_tel_txoption
{
870 struct ipv6_txoptions ops
;
874 static void init_tel_txopt(struct ipv6_tel_txoption
*opt
, __u8 encap_limit
)
876 memset(opt
, 0, sizeof(struct ipv6_tel_txoption
));
878 opt
->dst_opt
[2] = IPV6_TLV_TNL_ENCAP_LIMIT
;
880 opt
->dst_opt
[4] = encap_limit
;
881 opt
->dst_opt
[5] = IPV6_TLV_PADN
;
884 opt
->ops
.dst0opt
= (struct ipv6_opt_hdr
*) opt
->dst_opt
;
885 opt
->ops
.opt_nflen
= 8;
889 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
890 * @t: the outgoing tunnel device
891 * @hdr: IPv6 header from the incoming packet
894 * Avoid trivial tunneling loop by checking that tunnel exit-point
895 * doesn't match source of incoming packet.
903 ip6_tnl_addr_conflict(const struct ip6_tnl
*t
, const struct ipv6hdr
*hdr
)
905 return ipv6_addr_equal(&t
->parms
.raddr
, &hdr
->saddr
);
908 int ip6_tnl_xmit_ctl(struct ip6_tnl
*t
)
910 struct __ip6_tnl_parm
*p
= &t
->parms
;
912 struct net
*net
= t
->net
;
914 if (p
->flags
& IP6_TNL_F_CAP_XMIT
) {
915 struct net_device
*ldev
= NULL
;
919 ldev
= dev_get_by_index_rcu(net
, p
->link
);
921 if (unlikely(!ipv6_chk_addr(net
, &p
->laddr
, ldev
, 0)))
922 pr_warn("%s xmit: Local address not yet configured!\n",
924 else if (!ipv6_addr_is_multicast(&p
->raddr
) &&
925 unlikely(ipv6_chk_addr(net
, &p
->raddr
, NULL
, 0)))
926 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n",
934 EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl
);
937 * ip6_tnl_xmit2 - encapsulate packet and send
938 * @skb: the outgoing socket buffer
939 * @dev: the outgoing tunnel device
940 * @dsfield: dscp code for outer header
941 * @fl: flow of tunneled packet
942 * @encap_limit: encapsulation limit
943 * @pmtu: Path MTU is stored if packet is too big
946 * Build new header and do some sanity checks on the packet before sending
952 * %-EMSGSIZE message too big. return mtu in this case.
955 static int ip6_tnl_xmit2(struct sk_buff
*skb
,
956 struct net_device
*dev
,
962 struct ip6_tnl
*t
= netdev_priv(dev
);
963 struct net
*net
= t
->net
;
964 struct net_device_stats
*stats
= &t
->dev
->stats
;
965 struct ipv6hdr
*ipv6h
= ipv6_hdr(skb
);
966 struct ipv6_tel_txoption opt
;
967 struct dst_entry
*dst
= NULL
, *ndst
= NULL
;
968 struct net_device
*tdev
;
970 unsigned int max_headroom
= sizeof(struct ipv6hdr
);
974 if (!fl6
->flowi6_mark
)
975 dst
= ip6_tnl_dst_check(t
);
977 ndst
= ip6_route_output(net
, NULL
, fl6
);
980 goto tx_err_link_failure
;
981 ndst
= xfrm_lookup(net
, ndst
, flowi6_to_flowi(fl6
), NULL
, 0);
985 goto tx_err_link_failure
;
994 net_warn_ratelimited("%s: Local routing loop detected!\n",
996 goto tx_err_dst_release
;
998 mtu
= dst_mtu(dst
) - sizeof(*ipv6h
);
999 if (encap_limit
>= 0) {
1003 if (mtu
< IPV6_MIN_MTU
)
1006 skb_dst(skb
)->ops
->update_pmtu(skb_dst(skb
), NULL
, skb
, mtu
);
1007 if (skb
->len
> mtu
) {
1010 goto tx_err_dst_release
;
1013 skb_scrub_packet(skb
, !net_eq(t
->net
, dev_net(dev
)));
1016 * Okay, now see if we can stuff it in the buffer as-is.
1018 max_headroom
+= LL_RESERVED_SPACE(tdev
);
1020 if (skb_headroom(skb
) < max_headroom
|| skb_shared(skb
) ||
1021 (skb_cloned(skb
) && !skb_clone_writable(skb
, 0))) {
1022 struct sk_buff
*new_skb
;
1024 if (!(new_skb
= skb_realloc_headroom(skb
, max_headroom
)))
1025 goto tx_err_dst_release
;
1028 skb_set_owner_w(new_skb
, skb
->sk
);
1032 if (fl6
->flowi6_mark
) {
1033 skb_dst_set(skb
, dst
);
1036 skb_dst_set_noref(skb
, dst
);
1038 skb
->transport_header
= skb
->network_header
;
1040 proto
= fl6
->flowi6_proto
;
1041 if (encap_limit
>= 0) {
1042 init_tel_txopt(&opt
, encap_limit
);
1043 ipv6_push_nfrag_opts(skb
, &opt
.ops
, &proto
, NULL
);
1046 if (likely(!skb
->encapsulation
)) {
1047 skb_reset_inner_headers(skb
);
1048 skb
->encapsulation
= 1;
1051 skb_push(skb
, sizeof(struct ipv6hdr
));
1052 skb_reset_network_header(skb
);
1053 ipv6h
= ipv6_hdr(skb
);
1054 ip6_flow_hdr(ipv6h
, INET_ECN_encapsulate(0, dsfield
),
1055 ip6_make_flowlabel(net
, skb
, fl6
->flowlabel
, false));
1056 ipv6h
->hop_limit
= t
->parms
.hop_limit
;
1057 ipv6h
->nexthdr
= proto
;
1058 ipv6h
->saddr
= fl6
->saddr
;
1059 ipv6h
->daddr
= fl6
->daddr
;
1060 ip6tunnel_xmit(skb
, dev
);
1062 ip6_tnl_dst_store(t
, ndst
);
1064 tx_err_link_failure
:
1065 stats
->tx_carrier_errors
++;
1066 dst_link_failure(skb
);
1073 ip4ip6_tnl_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
1075 struct ip6_tnl
*t
= netdev_priv(dev
);
1076 const struct iphdr
*iph
= ip_hdr(skb
);
1077 int encap_limit
= -1;
1083 if ((t
->parms
.proto
!= IPPROTO_IPIP
&& t
->parms
.proto
!= 0) ||
1084 !ip6_tnl_xmit_ctl(t
))
1087 if (!(t
->parms
.flags
& IP6_TNL_F_IGN_ENCAP_LIMIT
))
1088 encap_limit
= t
->parms
.encap_limit
;
1090 memcpy(&fl6
, &t
->fl
.u
.ip6
, sizeof(fl6
));
1091 fl6
.flowi6_proto
= IPPROTO_IPIP
;
1093 dsfield
= ipv4_get_dsfield(iph
);
1095 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_TCLASS
)
1096 fl6
.flowlabel
|= htonl((__u32
)iph
->tos
<< IPV6_TCLASS_SHIFT
)
1098 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_FWMARK
)
1099 fl6
.flowi6_mark
= skb
->mark
;
1101 err
= ip6_tnl_xmit2(skb
, dev
, dsfield
, &fl6
, encap_limit
, &mtu
);
1103 /* XXX: send ICMP error even if DF is not set. */
1104 if (err
== -EMSGSIZE
)
1105 icmp_send(skb
, ICMP_DEST_UNREACH
, ICMP_FRAG_NEEDED
,
1114 ip6ip6_tnl_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
1116 struct ip6_tnl
*t
= netdev_priv(dev
);
1117 struct ipv6hdr
*ipv6h
= ipv6_hdr(skb
);
1118 int encap_limit
= -1;
1125 if ((t
->parms
.proto
!= IPPROTO_IPV6
&& t
->parms
.proto
!= 0) ||
1126 !ip6_tnl_xmit_ctl(t
) || ip6_tnl_addr_conflict(t
, ipv6h
))
1129 offset
= ip6_tnl_parse_tlv_enc_lim(skb
, skb_network_header(skb
));
1131 struct ipv6_tlv_tnl_enc_lim
*tel
;
1132 tel
= (struct ipv6_tlv_tnl_enc_lim
*)&skb_network_header(skb
)[offset
];
1133 if (tel
->encap_limit
== 0) {
1134 icmpv6_send(skb
, ICMPV6_PARAMPROB
,
1135 ICMPV6_HDR_FIELD
, offset
+ 2);
1138 encap_limit
= tel
->encap_limit
- 1;
1139 } else if (!(t
->parms
.flags
& IP6_TNL_F_IGN_ENCAP_LIMIT
))
1140 encap_limit
= t
->parms
.encap_limit
;
1142 memcpy(&fl6
, &t
->fl
.u
.ip6
, sizeof(fl6
));
1143 fl6
.flowi6_proto
= IPPROTO_IPV6
;
1145 dsfield
= ipv6_get_dsfield(ipv6h
);
1146 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_TCLASS
)
1147 fl6
.flowlabel
|= (*(__be32
*) ipv6h
& IPV6_TCLASS_MASK
);
1148 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_FLOWLABEL
)
1149 fl6
.flowlabel
|= ip6_flowlabel(ipv6h
);
1150 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_FWMARK
)
1151 fl6
.flowi6_mark
= skb
->mark
;
1153 err
= ip6_tnl_xmit2(skb
, dev
, dsfield
, &fl6
, encap_limit
, &mtu
);
1155 if (err
== -EMSGSIZE
)
1156 icmpv6_send(skb
, ICMPV6_PKT_TOOBIG
, 0, mtu
);
1164 ip6_tnl_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
1166 struct ip6_tnl
*t
= netdev_priv(dev
);
1167 struct net_device_stats
*stats
= &t
->dev
->stats
;
1170 switch (skb
->protocol
) {
1171 case htons(ETH_P_IP
):
1172 ret
= ip4ip6_tnl_xmit(skb
, dev
);
1174 case htons(ETH_P_IPV6
):
1175 ret
= ip6ip6_tnl_xmit(skb
, dev
);
1184 return NETDEV_TX_OK
;
1188 stats
->tx_dropped
++;
1190 return NETDEV_TX_OK
;
1193 static void ip6_tnl_link_config(struct ip6_tnl
*t
)
1195 struct net_device
*dev
= t
->dev
;
1196 struct __ip6_tnl_parm
*p
= &t
->parms
;
1197 struct flowi6
*fl6
= &t
->fl
.u
.ip6
;
1199 memcpy(dev
->dev_addr
, &p
->laddr
, sizeof(struct in6_addr
));
1200 memcpy(dev
->broadcast
, &p
->raddr
, sizeof(struct in6_addr
));
1202 /* Set up flowi template */
1203 fl6
->saddr
= p
->laddr
;
1204 fl6
->daddr
= p
->raddr
;
1205 fl6
->flowi6_oif
= p
->link
;
1208 if (!(p
->flags
&IP6_TNL_F_USE_ORIG_TCLASS
))
1209 fl6
->flowlabel
|= IPV6_TCLASS_MASK
& p
->flowinfo
;
1210 if (!(p
->flags
&IP6_TNL_F_USE_ORIG_FLOWLABEL
))
1211 fl6
->flowlabel
|= IPV6_FLOWLABEL_MASK
& p
->flowinfo
;
1213 p
->flags
&= ~(IP6_TNL_F_CAP_XMIT
|IP6_TNL_F_CAP_RCV
|IP6_TNL_F_CAP_PER_PACKET
);
1214 p
->flags
|= ip6_tnl_get_cap(t
, &p
->laddr
, &p
->raddr
);
1216 if (p
->flags
&IP6_TNL_F_CAP_XMIT
&& p
->flags
&IP6_TNL_F_CAP_RCV
)
1217 dev
->flags
|= IFF_POINTOPOINT
;
1219 dev
->flags
&= ~IFF_POINTOPOINT
;
1221 dev
->iflink
= p
->link
;
1223 if (p
->flags
& IP6_TNL_F_CAP_XMIT
) {
1224 int strict
= (ipv6_addr_type(&p
->raddr
) &
1225 (IPV6_ADDR_MULTICAST
|IPV6_ADDR_LINKLOCAL
));
1227 struct rt6_info
*rt
= rt6_lookup(t
->net
,
1228 &p
->raddr
, &p
->laddr
,
1235 dev
->hard_header_len
= rt
->dst
.dev
->hard_header_len
+
1236 sizeof(struct ipv6hdr
);
1238 dev
->mtu
= rt
->dst
.dev
->mtu
- sizeof(struct ipv6hdr
);
1239 if (!(t
->parms
.flags
& IP6_TNL_F_IGN_ENCAP_LIMIT
))
1242 if (dev
->mtu
< IPV6_MIN_MTU
)
1243 dev
->mtu
= IPV6_MIN_MTU
;
1250 * ip6_tnl_change - update the tunnel parameters
1251 * @t: tunnel to be changed
1252 * @p: tunnel configuration parameters
1255 * ip6_tnl_change() updates the tunnel parameters
1259 ip6_tnl_change(struct ip6_tnl
*t
, const struct __ip6_tnl_parm
*p
)
1261 t
->parms
.laddr
= p
->laddr
;
1262 t
->parms
.raddr
= p
->raddr
;
1263 t
->parms
.flags
= p
->flags
;
1264 t
->parms
.hop_limit
= p
->hop_limit
;
1265 t
->parms
.encap_limit
= p
->encap_limit
;
1266 t
->parms
.flowinfo
= p
->flowinfo
;
1267 t
->parms
.link
= p
->link
;
1268 t
->parms
.proto
= p
->proto
;
1269 ip6_tnl_dst_reset(t
);
1270 ip6_tnl_link_config(t
);
1274 static int ip6_tnl_update(struct ip6_tnl
*t
, struct __ip6_tnl_parm
*p
)
1276 struct net
*net
= t
->net
;
1277 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
1280 ip6_tnl_unlink(ip6n
, t
);
1282 err
= ip6_tnl_change(t
, p
);
1283 ip6_tnl_link(ip6n
, t
);
1284 netdev_state_change(t
->dev
);
1289 ip6_tnl_parm_from_user(struct __ip6_tnl_parm
*p
, const struct ip6_tnl_parm
*u
)
1291 p
->laddr
= u
->laddr
;
1292 p
->raddr
= u
->raddr
;
1293 p
->flags
= u
->flags
;
1294 p
->hop_limit
= u
->hop_limit
;
1295 p
->encap_limit
= u
->encap_limit
;
1296 p
->flowinfo
= u
->flowinfo
;
1298 p
->proto
= u
->proto
;
1299 memcpy(p
->name
, u
->name
, sizeof(u
->name
));
1303 ip6_tnl_parm_to_user(struct ip6_tnl_parm
*u
, const struct __ip6_tnl_parm
*p
)
1305 u
->laddr
= p
->laddr
;
1306 u
->raddr
= p
->raddr
;
1307 u
->flags
= p
->flags
;
1308 u
->hop_limit
= p
->hop_limit
;
1309 u
->encap_limit
= p
->encap_limit
;
1310 u
->flowinfo
= p
->flowinfo
;
1312 u
->proto
= p
->proto
;
1313 memcpy(u
->name
, p
->name
, sizeof(u
->name
));
1317 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
1318 * @dev: virtual device associated with tunnel
1319 * @ifr: parameters passed from userspace
1320 * @cmd: command to be performed
1323 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
1326 * The possible commands are the following:
1327 * %SIOCGETTUNNEL: get tunnel parameters for device
1328 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1329 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1330 * %SIOCDELTUNNEL: delete tunnel
1332 * The fallback device "ip6tnl0", created during module
1333 * initialization, can be used for creating other tunnel devices.
1337 * %-EFAULT if unable to copy data to or from userspace,
1338 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1339 * %-EINVAL if passed tunnel parameters are invalid,
1340 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1341 * %-ENODEV if attempting to change or delete a nonexisting device
1345 ip6_tnl_ioctl(struct net_device
*dev
, struct ifreq
*ifr
, int cmd
)
1348 struct ip6_tnl_parm p
;
1349 struct __ip6_tnl_parm p1
;
1350 struct ip6_tnl
*t
= netdev_priv(dev
);
1351 struct net
*net
= t
->net
;
1352 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
1356 if (dev
== ip6n
->fb_tnl_dev
) {
1357 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
))) {
1361 ip6_tnl_parm_from_user(&p1
, &p
);
1362 t
= ip6_tnl_locate(net
, &p1
, 0);
1364 t
= netdev_priv(dev
);
1366 memset(&p
, 0, sizeof(p
));
1368 ip6_tnl_parm_to_user(&p
, &t
->parms
);
1369 if (copy_to_user(ifr
->ifr_ifru
.ifru_data
, &p
, sizeof(p
))) {
1376 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
1379 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
)))
1382 if (p
.proto
!= IPPROTO_IPV6
&& p
.proto
!= IPPROTO_IPIP
&&
1385 ip6_tnl_parm_from_user(&p1
, &p
);
1386 t
= ip6_tnl_locate(net
, &p1
, cmd
== SIOCADDTUNNEL
);
1387 if (dev
!= ip6n
->fb_tnl_dev
&& cmd
== SIOCCHGTUNNEL
) {
1389 if (t
->dev
!= dev
) {
1394 t
= netdev_priv(dev
);
1396 err
= ip6_tnl_update(t
, &p1
);
1400 ip6_tnl_parm_to_user(&p
, &t
->parms
);
1401 if (copy_to_user(ifr
->ifr_ifru
.ifru_data
, &p
, sizeof(p
)))
1405 err
= (cmd
== SIOCADDTUNNEL
? -ENOBUFS
: -ENOENT
);
1409 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
1412 if (dev
== ip6n
->fb_tnl_dev
) {
1414 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
)))
1417 ip6_tnl_parm_from_user(&p1
, &p
);
1418 t
= ip6_tnl_locate(net
, &p1
, 0);
1422 if (t
->dev
== ip6n
->fb_tnl_dev
)
1427 unregister_netdevice(dev
);
1436 * ip6_tnl_change_mtu - change mtu manually for tunnel device
1437 * @dev: virtual device associated with tunnel
1438 * @new_mtu: the new mtu
1442 * %-EINVAL if mtu too small
1446 ip6_tnl_change_mtu(struct net_device
*dev
, int new_mtu
)
1448 struct ip6_tnl
*tnl
= netdev_priv(dev
);
1450 if (tnl
->parms
.proto
== IPPROTO_IPIP
) {
1454 if (new_mtu
< IPV6_MIN_MTU
)
1457 if (new_mtu
> 0xFFF8 - dev
->hard_header_len
)
1464 static const struct net_device_ops ip6_tnl_netdev_ops
= {
1465 .ndo_uninit
= ip6_tnl_dev_uninit
,
1466 .ndo_start_xmit
= ip6_tnl_xmit
,
1467 .ndo_do_ioctl
= ip6_tnl_ioctl
,
1468 .ndo_change_mtu
= ip6_tnl_change_mtu
,
1469 .ndo_get_stats
= ip6_get_stats
,
1474 * ip6_tnl_dev_setup - setup virtual tunnel device
1475 * @dev: virtual device associated with tunnel
1478 * Initialize function pointers and device parameters
1481 static void ip6_tnl_dev_setup(struct net_device
*dev
)
1485 dev
->netdev_ops
= &ip6_tnl_netdev_ops
;
1486 dev
->destructor
= ip6_dev_free
;
1488 dev
->type
= ARPHRD_TUNNEL6
;
1489 dev
->hard_header_len
= LL_MAX_HEADER
+ sizeof(struct ipv6hdr
);
1490 dev
->mtu
= ETH_DATA_LEN
- sizeof(struct ipv6hdr
);
1491 t
= netdev_priv(dev
);
1492 if (!(t
->parms
.flags
& IP6_TNL_F_IGN_ENCAP_LIMIT
))
1494 dev
->flags
|= IFF_NOARP
;
1495 dev
->addr_len
= sizeof(struct in6_addr
);
1496 netif_keep_dst(dev
);
1497 /* This perm addr will be used as interface identifier by IPv6 */
1498 dev
->addr_assign_type
= NET_ADDR_RANDOM
;
1499 eth_random_addr(dev
->perm_addr
);
1504 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
1505 * @dev: virtual device associated with tunnel
1509 ip6_tnl_dev_init_gen(struct net_device
*dev
)
1511 struct ip6_tnl
*t
= netdev_priv(dev
);
1514 t
->net
= dev_net(dev
);
1515 dev
->tstats
= netdev_alloc_pcpu_stats(struct pcpu_sw_netstats
);
1522 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
1523 * @dev: virtual device associated with tunnel
1526 static int ip6_tnl_dev_init(struct net_device
*dev
)
1528 struct ip6_tnl
*t
= netdev_priv(dev
);
1529 int err
= ip6_tnl_dev_init_gen(dev
);
1533 ip6_tnl_link_config(t
);
1538 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
1539 * @dev: fallback device
1544 static int __net_init
ip6_fb_tnl_dev_init(struct net_device
*dev
)
1546 struct ip6_tnl
*t
= netdev_priv(dev
);
1547 struct net
*net
= dev_net(dev
);
1548 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
1549 int err
= ip6_tnl_dev_init_gen(dev
);
1554 t
->parms
.proto
= IPPROTO_IPV6
;
1557 ip6_tnl_link_config(t
);
1559 rcu_assign_pointer(ip6n
->tnls_wc
[0], t
);
1563 static int ip6_tnl_validate(struct nlattr
*tb
[], struct nlattr
*data
[])
1567 if (!data
|| !data
[IFLA_IPTUN_PROTO
])
1570 proto
= nla_get_u8(data
[IFLA_IPTUN_PROTO
]);
1571 if (proto
!= IPPROTO_IPV6
&&
1572 proto
!= IPPROTO_IPIP
&&
1579 static void ip6_tnl_netlink_parms(struct nlattr
*data
[],
1580 struct __ip6_tnl_parm
*parms
)
1582 memset(parms
, 0, sizeof(*parms
));
1587 if (data
[IFLA_IPTUN_LINK
])
1588 parms
->link
= nla_get_u32(data
[IFLA_IPTUN_LINK
]);
1590 if (data
[IFLA_IPTUN_LOCAL
])
1591 nla_memcpy(&parms
->laddr
, data
[IFLA_IPTUN_LOCAL
],
1592 sizeof(struct in6_addr
));
1594 if (data
[IFLA_IPTUN_REMOTE
])
1595 nla_memcpy(&parms
->raddr
, data
[IFLA_IPTUN_REMOTE
],
1596 sizeof(struct in6_addr
));
1598 if (data
[IFLA_IPTUN_TTL
])
1599 parms
->hop_limit
= nla_get_u8(data
[IFLA_IPTUN_TTL
]);
1601 if (data
[IFLA_IPTUN_ENCAP_LIMIT
])
1602 parms
->encap_limit
= nla_get_u8(data
[IFLA_IPTUN_ENCAP_LIMIT
]);
1604 if (data
[IFLA_IPTUN_FLOWINFO
])
1605 parms
->flowinfo
= nla_get_be32(data
[IFLA_IPTUN_FLOWINFO
]);
1607 if (data
[IFLA_IPTUN_FLAGS
])
1608 parms
->flags
= nla_get_u32(data
[IFLA_IPTUN_FLAGS
]);
1610 if (data
[IFLA_IPTUN_PROTO
])
1611 parms
->proto
= nla_get_u8(data
[IFLA_IPTUN_PROTO
]);
1614 static int ip6_tnl_newlink(struct net
*src_net
, struct net_device
*dev
,
1615 struct nlattr
*tb
[], struct nlattr
*data
[])
1617 struct net
*net
= dev_net(dev
);
1620 nt
= netdev_priv(dev
);
1621 ip6_tnl_netlink_parms(data
, &nt
->parms
);
1623 if (ip6_tnl_locate(net
, &nt
->parms
, 0))
1626 return ip6_tnl_create2(dev
);
1629 static int ip6_tnl_changelink(struct net_device
*dev
, struct nlattr
*tb
[],
1630 struct nlattr
*data
[])
1632 struct ip6_tnl
*t
= netdev_priv(dev
);
1633 struct __ip6_tnl_parm p
;
1634 struct net
*net
= t
->net
;
1635 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
1637 if (dev
== ip6n
->fb_tnl_dev
)
1640 ip6_tnl_netlink_parms(data
, &p
);
1642 t
= ip6_tnl_locate(net
, &p
, 0);
1648 t
= netdev_priv(dev
);
1650 return ip6_tnl_update(t
, &p
);
1653 static void ip6_tnl_dellink(struct net_device
*dev
, struct list_head
*head
)
1655 struct net
*net
= dev_net(dev
);
1656 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
1658 if (dev
!= ip6n
->fb_tnl_dev
)
1659 unregister_netdevice_queue(dev
, head
);
1662 static size_t ip6_tnl_get_size(const struct net_device
*dev
)
1665 /* IFLA_IPTUN_LINK */
1667 /* IFLA_IPTUN_LOCAL */
1668 nla_total_size(sizeof(struct in6_addr
)) +
1669 /* IFLA_IPTUN_REMOTE */
1670 nla_total_size(sizeof(struct in6_addr
)) +
1671 /* IFLA_IPTUN_TTL */
1673 /* IFLA_IPTUN_ENCAP_LIMIT */
1675 /* IFLA_IPTUN_FLOWINFO */
1677 /* IFLA_IPTUN_FLAGS */
1679 /* IFLA_IPTUN_PROTO */
1684 static int ip6_tnl_fill_info(struct sk_buff
*skb
, const struct net_device
*dev
)
1686 struct ip6_tnl
*tunnel
= netdev_priv(dev
);
1687 struct __ip6_tnl_parm
*parm
= &tunnel
->parms
;
1689 if (nla_put_u32(skb
, IFLA_IPTUN_LINK
, parm
->link
) ||
1690 nla_put(skb
, IFLA_IPTUN_LOCAL
, sizeof(struct in6_addr
),
1692 nla_put(skb
, IFLA_IPTUN_REMOTE
, sizeof(struct in6_addr
),
1694 nla_put_u8(skb
, IFLA_IPTUN_TTL
, parm
->hop_limit
) ||
1695 nla_put_u8(skb
, IFLA_IPTUN_ENCAP_LIMIT
, parm
->encap_limit
) ||
1696 nla_put_be32(skb
, IFLA_IPTUN_FLOWINFO
, parm
->flowinfo
) ||
1697 nla_put_u32(skb
, IFLA_IPTUN_FLAGS
, parm
->flags
) ||
1698 nla_put_u8(skb
, IFLA_IPTUN_PROTO
, parm
->proto
))
1699 goto nla_put_failure
;
1706 static const struct nla_policy ip6_tnl_policy
[IFLA_IPTUN_MAX
+ 1] = {
1707 [IFLA_IPTUN_LINK
] = { .type
= NLA_U32
},
1708 [IFLA_IPTUN_LOCAL
] = { .len
= sizeof(struct in6_addr
) },
1709 [IFLA_IPTUN_REMOTE
] = { .len
= sizeof(struct in6_addr
) },
1710 [IFLA_IPTUN_TTL
] = { .type
= NLA_U8
},
1711 [IFLA_IPTUN_ENCAP_LIMIT
] = { .type
= NLA_U8
},
1712 [IFLA_IPTUN_FLOWINFO
] = { .type
= NLA_U32
},
1713 [IFLA_IPTUN_FLAGS
] = { .type
= NLA_U32
},
1714 [IFLA_IPTUN_PROTO
] = { .type
= NLA_U8
},
1717 static struct rtnl_link_ops ip6_link_ops __read_mostly
= {
1719 .maxtype
= IFLA_IPTUN_MAX
,
1720 .policy
= ip6_tnl_policy
,
1721 .priv_size
= sizeof(struct ip6_tnl
),
1722 .setup
= ip6_tnl_dev_setup
,
1723 .validate
= ip6_tnl_validate
,
1724 .newlink
= ip6_tnl_newlink
,
1725 .changelink
= ip6_tnl_changelink
,
1726 .dellink
= ip6_tnl_dellink
,
1727 .get_size
= ip6_tnl_get_size
,
1728 .fill_info
= ip6_tnl_fill_info
,
1731 static struct xfrm6_tunnel ip4ip6_handler __read_mostly
= {
1732 .handler
= ip4ip6_rcv
,
1733 .err_handler
= ip4ip6_err
,
1737 static struct xfrm6_tunnel ip6ip6_handler __read_mostly
= {
1738 .handler
= ip6ip6_rcv
,
1739 .err_handler
= ip6ip6_err
,
1743 static void __net_exit
ip6_tnl_destroy_tunnels(struct net
*net
)
1745 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
1746 struct net_device
*dev
, *aux
;
1751 for_each_netdev_safe(net
, dev
, aux
)
1752 if (dev
->rtnl_link_ops
== &ip6_link_ops
)
1753 unregister_netdevice_queue(dev
, &list
);
1755 for (h
= 0; h
< HASH_SIZE
; h
++) {
1756 t
= rtnl_dereference(ip6n
->tnls_r_l
[h
]);
1758 /* If dev is in the same netns, it has already
1759 * been added to the list by the previous loop.
1761 if (!net_eq(dev_net(t
->dev
), net
))
1762 unregister_netdevice_queue(t
->dev
, &list
);
1763 t
= rtnl_dereference(t
->next
);
1767 unregister_netdevice_many(&list
);
1770 static int __net_init
ip6_tnl_init_net(struct net
*net
)
1772 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
1773 struct ip6_tnl
*t
= NULL
;
1776 ip6n
->tnls
[0] = ip6n
->tnls_wc
;
1777 ip6n
->tnls
[1] = ip6n
->tnls_r_l
;
1780 ip6n
->fb_tnl_dev
= alloc_netdev(sizeof(struct ip6_tnl
), "ip6tnl0",
1781 NET_NAME_UNKNOWN
, ip6_tnl_dev_setup
);
1783 if (!ip6n
->fb_tnl_dev
)
1785 dev_net_set(ip6n
->fb_tnl_dev
, net
);
1786 ip6n
->fb_tnl_dev
->rtnl_link_ops
= &ip6_link_ops
;
1787 /* FB netdevice is special: we have one, and only one per netns.
1788 * Allowing to move it to another netns is clearly unsafe.
1790 ip6n
->fb_tnl_dev
->features
|= NETIF_F_NETNS_LOCAL
;
1792 err
= ip6_fb_tnl_dev_init(ip6n
->fb_tnl_dev
);
1796 err
= register_netdev(ip6n
->fb_tnl_dev
);
1800 t
= netdev_priv(ip6n
->fb_tnl_dev
);
1802 strcpy(t
->parms
.name
, ip6n
->fb_tnl_dev
->name
);
1806 ip6_dev_free(ip6n
->fb_tnl_dev
);
1811 static void __net_exit
ip6_tnl_exit_net(struct net
*net
)
1814 ip6_tnl_destroy_tunnels(net
);
1818 static struct pernet_operations ip6_tnl_net_ops
= {
1819 .init
= ip6_tnl_init_net
,
1820 .exit
= ip6_tnl_exit_net
,
1821 .id
= &ip6_tnl_net_id
,
1822 .size
= sizeof(struct ip6_tnl_net
),
1826 * ip6_tunnel_init - register protocol and reserve needed resources
1828 * Return: 0 on success
1831 static int __init
ip6_tunnel_init(void)
1835 err
= register_pernet_device(&ip6_tnl_net_ops
);
1839 err
= xfrm6_tunnel_register(&ip4ip6_handler
, AF_INET
);
1841 pr_err("%s: can't register ip4ip6\n", __func__
);
1845 err
= xfrm6_tunnel_register(&ip6ip6_handler
, AF_INET6
);
1847 pr_err("%s: can't register ip6ip6\n", __func__
);
1850 err
= rtnl_link_register(&ip6_link_ops
);
1852 goto rtnl_link_failed
;
1857 xfrm6_tunnel_deregister(&ip6ip6_handler
, AF_INET6
);
1859 xfrm6_tunnel_deregister(&ip4ip6_handler
, AF_INET
);
1861 unregister_pernet_device(&ip6_tnl_net_ops
);
1867 * ip6_tunnel_cleanup - free resources and unregister protocol
1870 static void __exit
ip6_tunnel_cleanup(void)
1872 rtnl_link_unregister(&ip6_link_ops
);
1873 if (xfrm6_tunnel_deregister(&ip4ip6_handler
, AF_INET
))
1874 pr_info("%s: can't deregister ip4ip6\n", __func__
);
1876 if (xfrm6_tunnel_deregister(&ip6ip6_handler
, AF_INET6
))
1877 pr_info("%s: can't deregister ip6ip6\n", __func__
);
1879 unregister_pernet_device(&ip6_tnl_net_ops
);
1882 module_init(ip6_tunnel_init
);
1883 module_exit(ip6_tunnel_cleanup
);