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 <linux/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>
60 #include <net/dst_metadata.h>
62 MODULE_AUTHOR("Ville Nuorvala");
63 MODULE_DESCRIPTION("IPv6 tunneling device");
64 MODULE_LICENSE("GPL");
65 MODULE_ALIAS_RTNL_LINK("ip6tnl");
66 MODULE_ALIAS_NETDEV("ip6tnl0");
68 #define IP6_TUNNEL_HASH_SIZE_SHIFT 5
69 #define IP6_TUNNEL_HASH_SIZE (1 << IP6_TUNNEL_HASH_SIZE_SHIFT)
71 static bool log_ecn_error
= true;
72 module_param(log_ecn_error
, bool, 0644);
73 MODULE_PARM_DESC(log_ecn_error
, "Log packets received with corrupted ECN");
75 static u32
HASH(const struct in6_addr
*addr1
, const struct in6_addr
*addr2
)
77 u32 hash
= ipv6_addr_hash(addr1
) ^ ipv6_addr_hash(addr2
);
79 return hash_32(hash
, IP6_TUNNEL_HASH_SIZE_SHIFT
);
82 static int ip6_tnl_dev_init(struct net_device
*dev
);
83 static void ip6_tnl_dev_setup(struct net_device
*dev
);
84 static struct rtnl_link_ops ip6_link_ops __read_mostly
;
86 static unsigned int ip6_tnl_net_id __read_mostly
;
88 /* the IPv6 tunnel fallback device */
89 struct net_device
*fb_tnl_dev
;
90 /* lists for storing tunnels in use */
91 struct ip6_tnl __rcu
*tnls_r_l
[IP6_TUNNEL_HASH_SIZE
];
92 struct ip6_tnl __rcu
*tnls_wc
[1];
93 struct ip6_tnl __rcu
**tnls
[2];
94 struct ip6_tnl __rcu
*collect_md_tun
;
97 static struct net_device_stats
*ip6_get_stats(struct net_device
*dev
)
99 struct pcpu_sw_netstats tmp
, sum
= { 0 };
102 for_each_possible_cpu(i
) {
104 const struct pcpu_sw_netstats
*tstats
=
105 per_cpu_ptr(dev
->tstats
, i
);
108 start
= u64_stats_fetch_begin_irq(&tstats
->syncp
);
109 tmp
.rx_packets
= tstats
->rx_packets
;
110 tmp
.rx_bytes
= tstats
->rx_bytes
;
111 tmp
.tx_packets
= tstats
->tx_packets
;
112 tmp
.tx_bytes
= tstats
->tx_bytes
;
113 } while (u64_stats_fetch_retry_irq(&tstats
->syncp
, start
));
115 sum
.rx_packets
+= tmp
.rx_packets
;
116 sum
.rx_bytes
+= tmp
.rx_bytes
;
117 sum
.tx_packets
+= tmp
.tx_packets
;
118 sum
.tx_bytes
+= tmp
.tx_bytes
;
120 dev
->stats
.rx_packets
= sum
.rx_packets
;
121 dev
->stats
.rx_bytes
= sum
.rx_bytes
;
122 dev
->stats
.tx_packets
= sum
.tx_packets
;
123 dev
->stats
.tx_bytes
= sum
.tx_bytes
;
128 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
129 * @remote: the address of the tunnel exit-point
130 * @local: the address of the tunnel entry-point
133 * tunnel matching given end-points if found,
134 * else fallback tunnel if its device is up,
138 #define for_each_ip6_tunnel_rcu(start) \
139 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
141 static struct ip6_tnl
*
142 ip6_tnl_lookup(struct net
*net
, const struct in6_addr
*remote
, const struct in6_addr
*local
)
144 unsigned int hash
= HASH(remote
, local
);
146 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
149 for_each_ip6_tunnel_rcu(ip6n
->tnls_r_l
[hash
]) {
150 if (ipv6_addr_equal(local
, &t
->parms
.laddr
) &&
151 ipv6_addr_equal(remote
, &t
->parms
.raddr
) &&
152 (t
->dev
->flags
& IFF_UP
))
156 memset(&any
, 0, sizeof(any
));
157 hash
= HASH(&any
, local
);
158 for_each_ip6_tunnel_rcu(ip6n
->tnls_r_l
[hash
]) {
159 if (ipv6_addr_equal(local
, &t
->parms
.laddr
) &&
160 ipv6_addr_any(&t
->parms
.raddr
) &&
161 (t
->dev
->flags
& IFF_UP
))
165 hash
= HASH(remote
, &any
);
166 for_each_ip6_tunnel_rcu(ip6n
->tnls_r_l
[hash
]) {
167 if (ipv6_addr_equal(remote
, &t
->parms
.raddr
) &&
168 ipv6_addr_any(&t
->parms
.laddr
) &&
169 (t
->dev
->flags
& IFF_UP
))
173 t
= rcu_dereference(ip6n
->collect_md_tun
);
177 t
= rcu_dereference(ip6n
->tnls_wc
[0]);
178 if (t
&& (t
->dev
->flags
& IFF_UP
))
185 * ip6_tnl_bucket - get head of list matching given tunnel parameters
186 * @p: parameters containing tunnel end-points
189 * ip6_tnl_bucket() returns the head of the list matching the
190 * &struct in6_addr entries laddr and raddr in @p.
192 * Return: head of IPv6 tunnel list
195 static struct ip6_tnl __rcu
**
196 ip6_tnl_bucket(struct ip6_tnl_net
*ip6n
, const struct __ip6_tnl_parm
*p
)
198 const struct in6_addr
*remote
= &p
->raddr
;
199 const struct in6_addr
*local
= &p
->laddr
;
203 if (!ipv6_addr_any(remote
) || !ipv6_addr_any(local
)) {
205 h
= HASH(remote
, local
);
207 return &ip6n
->tnls
[prio
][h
];
211 * ip6_tnl_link - add tunnel to hash table
212 * @t: tunnel to be added
216 ip6_tnl_link(struct ip6_tnl_net
*ip6n
, struct ip6_tnl
*t
)
218 struct ip6_tnl __rcu
**tp
= ip6_tnl_bucket(ip6n
, &t
->parms
);
220 if (t
->parms
.collect_md
)
221 rcu_assign_pointer(ip6n
->collect_md_tun
, t
);
222 rcu_assign_pointer(t
->next
, rtnl_dereference(*tp
));
223 rcu_assign_pointer(*tp
, t
);
227 * ip6_tnl_unlink - remove tunnel from hash table
228 * @t: tunnel to be removed
232 ip6_tnl_unlink(struct ip6_tnl_net
*ip6n
, struct ip6_tnl
*t
)
234 struct ip6_tnl __rcu
**tp
;
235 struct ip6_tnl
*iter
;
237 if (t
->parms
.collect_md
)
238 rcu_assign_pointer(ip6n
->collect_md_tun
, NULL
);
240 for (tp
= ip6_tnl_bucket(ip6n
, &t
->parms
);
241 (iter
= rtnl_dereference(*tp
)) != NULL
;
244 rcu_assign_pointer(*tp
, t
->next
);
250 static void ip6_dev_free(struct net_device
*dev
)
252 struct ip6_tnl
*t
= netdev_priv(dev
);
254 gro_cells_destroy(&t
->gro_cells
);
255 dst_cache_destroy(&t
->dst_cache
);
256 free_percpu(dev
->tstats
);
260 static int ip6_tnl_create2(struct net_device
*dev
)
262 struct ip6_tnl
*t
= netdev_priv(dev
);
263 struct net
*net
= dev_net(dev
);
264 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
267 t
= netdev_priv(dev
);
269 dev
->rtnl_link_ops
= &ip6_link_ops
;
270 err
= register_netdevice(dev
);
274 strcpy(t
->parms
.name
, dev
->name
);
277 ip6_tnl_link(ip6n
, t
);
285 * ip6_tnl_create - create a new tunnel
286 * @p: tunnel parameters
287 * @pt: pointer to new tunnel
290 * Create tunnel matching given parameters.
293 * created tunnel or error pointer
296 static struct ip6_tnl
*ip6_tnl_create(struct net
*net
, struct __ip6_tnl_parm
*p
)
298 struct net_device
*dev
;
304 strlcpy(name
, p
->name
, IFNAMSIZ
);
306 sprintf(name
, "ip6tnl%%d");
308 dev
= alloc_netdev(sizeof(*t
), name
, NET_NAME_UNKNOWN
,
313 dev_net_set(dev
, net
);
315 t
= netdev_priv(dev
);
317 t
->net
= dev_net(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 error pointer
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
)) {
359 return ERR_PTR(-EEXIST
);
365 return ERR_PTR(-ENODEV
);
366 return ip6_tnl_create(net
, p
);
370 * ip6_tnl_dev_uninit - tunnel device uninitializer
371 * @dev: the device to be destroyed
374 * ip6_tnl_dev_uninit() removes tunnel from its list
378 ip6_tnl_dev_uninit(struct net_device
*dev
)
380 struct ip6_tnl
*t
= netdev_priv(dev
);
381 struct net
*net
= t
->net
;
382 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
384 if (dev
== ip6n
->fb_tnl_dev
)
385 RCU_INIT_POINTER(ip6n
->tnls_wc
[0], NULL
);
387 ip6_tnl_unlink(ip6n
, t
);
388 dst_cache_reset(&t
->dst_cache
);
393 * parse_tvl_tnl_enc_lim - handle encapsulation limit option
394 * @skb: received socket buffer
397 * 0 if none was found,
398 * else index to encapsulation limit
401 __u16
ip6_tnl_parse_tlv_enc_lim(struct sk_buff
*skb
, __u8
*raw
)
403 const struct ipv6hdr
*ipv6h
= (const struct ipv6hdr
*)raw
;
404 unsigned int nhoff
= raw
- skb
->data
;
405 unsigned int off
= nhoff
+ sizeof(*ipv6h
);
406 u8 next
, nexthdr
= ipv6h
->nexthdr
;
408 while (ipv6_ext_hdr(nexthdr
) && nexthdr
!= NEXTHDR_NONE
) {
409 struct ipv6_opt_hdr
*hdr
;
412 if (!pskb_may_pull(skb
, off
+ sizeof(*hdr
)))
415 hdr
= (struct ipv6_opt_hdr
*)(skb
->data
+ off
);
416 if (nexthdr
== NEXTHDR_FRAGMENT
) {
417 struct frag_hdr
*frag_hdr
= (struct frag_hdr
*) hdr
;
418 if (frag_hdr
->frag_off
)
421 } else if (nexthdr
== NEXTHDR_AUTH
) {
422 optlen
= (hdr
->hdrlen
+ 2) << 2;
424 optlen
= ipv6_optlen(hdr
);
426 /* cache hdr->nexthdr, since pskb_may_pull() might
430 if (nexthdr
== NEXTHDR_DEST
) {
433 /* Remember : hdr is no longer valid at this point. */
434 if (!pskb_may_pull(skb
, off
+ optlen
))
438 struct ipv6_tlv_tnl_enc_lim
*tel
;
440 /* No more room for encapsulation limit */
441 if (i
+ sizeof(*tel
) > optlen
)
444 tel
= (struct ipv6_tlv_tnl_enc_lim
*)(skb
->data
+ off
+ i
);
445 /* return index of option if found and valid */
446 if (tel
->type
== IPV6_TLV_TNL_ENCAP_LIMIT
&&
448 return i
+ off
- nhoff
;
449 /* else jump to next option */
451 i
+= tel
->length
+ 2;
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
;
485 /* If the packet doesn't contain the original IPv6 header we are
486 in trouble since we might need the source address for further
487 processing of the error. */
490 t
= ip6_tnl_lookup(dev_net(skb
->dev
), &ipv6h
->daddr
, &ipv6h
->saddr
);
494 tproto
= ACCESS_ONCE(t
->parms
.proto
);
495 if (tproto
!= ipproto
&& tproto
!= 0)
502 struct ipv6_tlv_tnl_enc_lim
*tel
;
504 case ICMPV6_DEST_UNREACH
:
505 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
509 case ICMPV6_TIME_EXCEED
:
510 if ((*code
) == ICMPV6_EXC_HOPLIMIT
) {
511 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
516 case ICMPV6_PARAMPROB
:
518 if ((*code
) == ICMPV6_HDR_FIELD
)
519 teli
= ip6_tnl_parse_tlv_enc_lim(skb
, skb
->data
);
521 if (teli
&& teli
== *info
- 2) {
522 tel
= (struct ipv6_tlv_tnl_enc_lim
*) &skb
->data
[teli
];
523 if (tel
->encap_limit
== 0) {
524 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
529 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
533 case ICMPV6_PKT_TOOBIG
:
534 mtu
= *info
- offset
;
535 if (mtu
< IPV6_MIN_MTU
)
539 len
= sizeof(*ipv6h
) + ntohs(ipv6h
->payload_len
);
541 rel_type
= ICMPV6_PKT_TOOBIG
;
560 ip4ip6_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
561 u8 type
, u8 code
, int offset
, __be32 info
)
566 __u32 rel_info
= ntohl(info
);
568 struct sk_buff
*skb2
;
569 const struct iphdr
*eiph
;
573 err
= ip6_tnl_err(skb
, IPPROTO_IPIP
, opt
, &rel_type
, &rel_code
,
574 &rel_msg
, &rel_info
, offset
);
582 case ICMPV6_DEST_UNREACH
:
583 if (rel_code
!= ICMPV6_ADDR_UNREACH
)
585 rel_type
= ICMP_DEST_UNREACH
;
586 rel_code
= ICMP_HOST_UNREACH
;
588 case ICMPV6_PKT_TOOBIG
:
591 rel_type
= ICMP_DEST_UNREACH
;
592 rel_code
= ICMP_FRAG_NEEDED
;
595 rel_type
= ICMP_REDIRECT
;
596 rel_code
= ICMP_REDIR_HOST
;
601 if (!pskb_may_pull(skb
, offset
+ sizeof(struct iphdr
)))
604 skb2
= skb_clone(skb
, GFP_ATOMIC
);
610 skb_pull(skb2
, offset
);
611 skb_reset_network_header(skb2
);
614 /* Try to guess incoming interface */
615 rt
= ip_route_output_ports(dev_net(skb
->dev
), &fl4
, NULL
,
618 IPPROTO_IPIP
, RT_TOS(eiph
->tos
), 0);
622 skb2
->dev
= rt
->dst
.dev
;
624 /* route "incoming" packet */
625 if (rt
->rt_flags
& RTCF_LOCAL
) {
628 rt
= ip_route_output_ports(dev_net(skb
->dev
), &fl4
, NULL
,
629 eiph
->daddr
, eiph
->saddr
,
632 RT_TOS(eiph
->tos
), 0);
634 rt
->dst
.dev
->type
!= ARPHRD_TUNNEL
) {
639 skb_dst_set(skb2
, &rt
->dst
);
642 if (ip_route_input(skb2
, eiph
->daddr
, eiph
->saddr
, eiph
->tos
,
644 skb_dst(skb2
)->dev
->type
!= ARPHRD_TUNNEL
)
648 /* change mtu on this route */
649 if (rel_type
== ICMP_DEST_UNREACH
&& rel_code
== ICMP_FRAG_NEEDED
) {
650 if (rel_info
> dst_mtu(skb_dst(skb2
)))
653 skb_dst(skb2
)->ops
->update_pmtu(skb_dst(skb2
), NULL
, skb2
, rel_info
);
655 if (rel_type
== ICMP_REDIRECT
)
656 skb_dst(skb2
)->ops
->redirect(skb_dst(skb2
), NULL
, skb2
);
658 icmp_send(skb2
, rel_type
, rel_code
, htonl(rel_info
));
666 ip6ip6_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
667 u8 type
, u8 code
, int offset
, __be32 info
)
672 __u32 rel_info
= ntohl(info
);
675 err
= ip6_tnl_err(skb
, IPPROTO_IPV6
, opt
, &rel_type
, &rel_code
,
676 &rel_msg
, &rel_info
, offset
);
680 if (rel_msg
&& pskb_may_pull(skb
, offset
+ sizeof(struct ipv6hdr
))) {
682 struct sk_buff
*skb2
= skb_clone(skb
, GFP_ATOMIC
);
688 skb_pull(skb2
, offset
);
689 skb_reset_network_header(skb2
);
691 /* Try to guess incoming interface */
692 rt
= rt6_lookup(dev_net(skb
->dev
), &ipv6_hdr(skb2
)->saddr
,
695 if (rt
&& rt
->dst
.dev
)
696 skb2
->dev
= rt
->dst
.dev
;
698 icmpv6_send(skb2
, rel_type
, rel_code
, rel_info
);
708 static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl
*t
,
709 const struct ipv6hdr
*ipv6h
,
712 __u8 dsfield
= ipv6_get_dsfield(ipv6h
) & ~INET_ECN_MASK
;
714 if (t
->parms
.flags
& IP6_TNL_F_RCV_DSCP_COPY
)
715 ipv4_change_dsfield(ip_hdr(skb
), INET_ECN_MASK
, dsfield
);
717 return IP6_ECN_decapsulate(ipv6h
, skb
);
720 static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl
*t
,
721 const struct ipv6hdr
*ipv6h
,
724 if (t
->parms
.flags
& IP6_TNL_F_RCV_DSCP_COPY
)
725 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h
), ipv6_hdr(skb
));
727 return IP6_ECN_decapsulate(ipv6h
, skb
);
730 __u32
ip6_tnl_get_cap(struct ip6_tnl
*t
,
731 const struct in6_addr
*laddr
,
732 const struct in6_addr
*raddr
)
734 struct __ip6_tnl_parm
*p
= &t
->parms
;
735 int ltype
= ipv6_addr_type(laddr
);
736 int rtype
= ipv6_addr_type(raddr
);
739 if (ltype
== IPV6_ADDR_ANY
|| rtype
== IPV6_ADDR_ANY
) {
740 flags
= IP6_TNL_F_CAP_PER_PACKET
;
741 } else if (ltype
& (IPV6_ADDR_UNICAST
|IPV6_ADDR_MULTICAST
) &&
742 rtype
& (IPV6_ADDR_UNICAST
|IPV6_ADDR_MULTICAST
) &&
743 !((ltype
|rtype
) & IPV6_ADDR_LOOPBACK
) &&
744 (!((ltype
|rtype
) & IPV6_ADDR_LINKLOCAL
) || p
->link
)) {
745 if (ltype
&IPV6_ADDR_UNICAST
)
746 flags
|= IP6_TNL_F_CAP_XMIT
;
747 if (rtype
&IPV6_ADDR_UNICAST
)
748 flags
|= IP6_TNL_F_CAP_RCV
;
752 EXPORT_SYMBOL(ip6_tnl_get_cap
);
754 /* called with rcu_read_lock() */
755 int ip6_tnl_rcv_ctl(struct ip6_tnl
*t
,
756 const struct in6_addr
*laddr
,
757 const struct in6_addr
*raddr
)
759 struct __ip6_tnl_parm
*p
= &t
->parms
;
761 struct net
*net
= t
->net
;
763 if ((p
->flags
& IP6_TNL_F_CAP_RCV
) ||
764 ((p
->flags
& IP6_TNL_F_CAP_PER_PACKET
) &&
765 (ip6_tnl_get_cap(t
, laddr
, raddr
) & IP6_TNL_F_CAP_RCV
))) {
766 struct net_device
*ldev
= NULL
;
769 ldev
= dev_get_by_index_rcu(net
, p
->link
);
771 if ((ipv6_addr_is_multicast(laddr
) ||
772 likely(ipv6_chk_addr(net
, laddr
, ldev
, 0))) &&
773 likely(!ipv6_chk_addr(net
, raddr
, NULL
, 0)))
778 EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl
);
780 static int __ip6_tnl_rcv(struct ip6_tnl
*tunnel
, struct sk_buff
*skb
,
781 const struct tnl_ptk_info
*tpi
,
782 struct metadata_dst
*tun_dst
,
783 int (*dscp_ecn_decapsulate
)(const struct ip6_tnl
*t
,
784 const struct ipv6hdr
*ipv6h
,
785 struct sk_buff
*skb
),
788 struct pcpu_sw_netstats
*tstats
;
789 const struct ipv6hdr
*ipv6h
= ipv6_hdr(skb
);
792 if ((!(tpi
->flags
& TUNNEL_CSUM
) &&
793 (tunnel
->parms
.i_flags
& TUNNEL_CSUM
)) ||
794 ((tpi
->flags
& TUNNEL_CSUM
) &&
795 !(tunnel
->parms
.i_flags
& TUNNEL_CSUM
))) {
796 tunnel
->dev
->stats
.rx_crc_errors
++;
797 tunnel
->dev
->stats
.rx_errors
++;
801 if (tunnel
->parms
.i_flags
& TUNNEL_SEQ
) {
802 if (!(tpi
->flags
& TUNNEL_SEQ
) ||
804 (s32
)(ntohl(tpi
->seq
) - tunnel
->i_seqno
) < 0)) {
805 tunnel
->dev
->stats
.rx_fifo_errors
++;
806 tunnel
->dev
->stats
.rx_errors
++;
809 tunnel
->i_seqno
= ntohl(tpi
->seq
) + 1;
812 skb
->protocol
= tpi
->proto
;
814 /* Warning: All skb pointers will be invalidated! */
815 if (tunnel
->dev
->type
== ARPHRD_ETHER
) {
816 if (!pskb_may_pull(skb
, ETH_HLEN
)) {
817 tunnel
->dev
->stats
.rx_length_errors
++;
818 tunnel
->dev
->stats
.rx_errors
++;
822 ipv6h
= ipv6_hdr(skb
);
823 skb
->protocol
= eth_type_trans(skb
, tunnel
->dev
);
824 skb_postpull_rcsum(skb
, eth_hdr(skb
), ETH_HLEN
);
826 skb
->dev
= tunnel
->dev
;
829 skb_reset_network_header(skb
);
830 memset(skb
->cb
, 0, sizeof(struct inet6_skb_parm
));
832 __skb_tunnel_rx(skb
, tunnel
->dev
, tunnel
->net
);
834 err
= dscp_ecn_decapsulate(tunnel
, ipv6h
, skb
);
837 net_info_ratelimited("non-ECT from %pI6 with DS=%#x\n",
839 ipv6_get_dsfield(ipv6h
));
841 ++tunnel
->dev
->stats
.rx_frame_errors
;
842 ++tunnel
->dev
->stats
.rx_errors
;
847 tstats
= this_cpu_ptr(tunnel
->dev
->tstats
);
848 u64_stats_update_begin(&tstats
->syncp
);
849 tstats
->rx_packets
++;
850 tstats
->rx_bytes
+= skb
->len
;
851 u64_stats_update_end(&tstats
->syncp
);
853 skb_scrub_packet(skb
, !net_eq(tunnel
->net
, dev_net(tunnel
->dev
)));
856 skb_dst_set(skb
, (struct dst_entry
*)tun_dst
);
858 gro_cells_receive(&tunnel
->gro_cells
, skb
);
866 int ip6_tnl_rcv(struct ip6_tnl
*t
, struct sk_buff
*skb
,
867 const struct tnl_ptk_info
*tpi
,
868 struct metadata_dst
*tun_dst
,
871 return __ip6_tnl_rcv(t
, skb
, tpi
, NULL
, ip6ip6_dscp_ecn_decapsulate
,
874 EXPORT_SYMBOL(ip6_tnl_rcv
);
876 static const struct tnl_ptk_info tpi_v6
= {
877 /* no tunnel info required for ipxip6. */
878 .proto
= htons(ETH_P_IPV6
),
881 static const struct tnl_ptk_info tpi_v4
= {
882 /* no tunnel info required for ipxip6. */
883 .proto
= htons(ETH_P_IP
),
886 static int ipxip6_rcv(struct sk_buff
*skb
, u8 ipproto
,
887 const struct tnl_ptk_info
*tpi
,
888 int (*dscp_ecn_decapsulate
)(const struct ip6_tnl
*t
,
889 const struct ipv6hdr
*ipv6h
,
890 struct sk_buff
*skb
))
893 const struct ipv6hdr
*ipv6h
= ipv6_hdr(skb
);
894 struct metadata_dst
*tun_dst
= NULL
;
898 t
= ip6_tnl_lookup(dev_net(skb
->dev
), &ipv6h
->saddr
, &ipv6h
->daddr
);
901 u8 tproto
= ACCESS_ONCE(t
->parms
.proto
);
903 if (tproto
!= ipproto
&& tproto
!= 0)
905 if (!xfrm6_policy_check(NULL
, XFRM_POLICY_IN
, skb
))
907 if (!ip6_tnl_rcv_ctl(t
, &ipv6h
->daddr
, &ipv6h
->saddr
))
909 if (iptunnel_pull_header(skb
, 0, tpi
->proto
, false))
911 if (t
->parms
.collect_md
) {
912 tun_dst
= ipv6_tun_rx_dst(skb
, 0, 0, 0);
916 ret
= __ip6_tnl_rcv(t
, skb
, tpi
, tun_dst
, dscp_ecn_decapsulate
,
930 static int ip4ip6_rcv(struct sk_buff
*skb
)
932 return ipxip6_rcv(skb
, IPPROTO_IPIP
, &tpi_v4
,
933 ip4ip6_dscp_ecn_decapsulate
);
936 static int ip6ip6_rcv(struct sk_buff
*skb
)
938 return ipxip6_rcv(skb
, IPPROTO_IPV6
, &tpi_v6
,
939 ip6ip6_dscp_ecn_decapsulate
);
942 struct ipv6_tel_txoption
{
943 struct ipv6_txoptions ops
;
947 static void init_tel_txopt(struct ipv6_tel_txoption
*opt
, __u8 encap_limit
)
949 memset(opt
, 0, sizeof(struct ipv6_tel_txoption
));
951 opt
->dst_opt
[2] = IPV6_TLV_TNL_ENCAP_LIMIT
;
953 opt
->dst_opt
[4] = encap_limit
;
954 opt
->dst_opt
[5] = IPV6_TLV_PADN
;
957 opt
->ops
.dst1opt
= (struct ipv6_opt_hdr
*) opt
->dst_opt
;
958 opt
->ops
.opt_nflen
= 8;
962 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
963 * @t: the outgoing tunnel device
964 * @hdr: IPv6 header from the incoming packet
967 * Avoid trivial tunneling loop by checking that tunnel exit-point
968 * doesn't match source of incoming packet.
976 ip6_tnl_addr_conflict(const struct ip6_tnl
*t
, const struct ipv6hdr
*hdr
)
978 return ipv6_addr_equal(&t
->parms
.raddr
, &hdr
->saddr
);
981 int ip6_tnl_xmit_ctl(struct ip6_tnl
*t
,
982 const struct in6_addr
*laddr
,
983 const struct in6_addr
*raddr
)
985 struct __ip6_tnl_parm
*p
= &t
->parms
;
987 struct net
*net
= t
->net
;
989 if ((p
->flags
& IP6_TNL_F_CAP_XMIT
) ||
990 ((p
->flags
& IP6_TNL_F_CAP_PER_PACKET
) &&
991 (ip6_tnl_get_cap(t
, laddr
, raddr
) & IP6_TNL_F_CAP_XMIT
))) {
992 struct net_device
*ldev
= NULL
;
996 ldev
= dev_get_by_index_rcu(net
, p
->link
);
998 if (unlikely(!ipv6_chk_addr(net
, laddr
, ldev
, 0)))
999 pr_warn("%s xmit: Local address not yet configured!\n",
1001 else if (!ipv6_addr_is_multicast(raddr
) &&
1002 unlikely(ipv6_chk_addr(net
, raddr
, NULL
, 0)))
1003 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n",
1011 EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl
);
1014 * ip6_tnl_xmit - encapsulate packet and send
1015 * @skb: the outgoing socket buffer
1016 * @dev: the outgoing tunnel device
1017 * @dsfield: dscp code for outer header
1018 * @fl6: flow of tunneled packet
1019 * @encap_limit: encapsulation limit
1020 * @pmtu: Path MTU is stored if packet is too big
1021 * @proto: next header value
1024 * Build new header and do some sanity checks on the packet before sending
1030 * %-EMSGSIZE message too big. return mtu in this case.
1033 int ip6_tnl_xmit(struct sk_buff
*skb
, struct net_device
*dev
, __u8 dsfield
,
1034 struct flowi6
*fl6
, int encap_limit
, __u32
*pmtu
,
1037 struct ip6_tnl
*t
= netdev_priv(dev
);
1038 struct net
*net
= t
->net
;
1039 struct net_device_stats
*stats
= &t
->dev
->stats
;
1040 struct ipv6hdr
*ipv6h
;
1041 struct ipv6_tel_txoption opt
;
1042 struct dst_entry
*dst
= NULL
, *ndst
= NULL
;
1043 struct net_device
*tdev
;
1045 unsigned int psh_hlen
= sizeof(struct ipv6hdr
) + t
->encap_hlen
;
1046 unsigned int max_headroom
= psh_hlen
;
1047 bool use_cache
= false;
1051 if (t
->parms
.collect_md
) {
1052 hop_limit
= skb_tunnel_info(skb
)->key
.ttl
;
1055 hop_limit
= t
->parms
.hop_limit
;
1059 if (ipv6_addr_any(&t
->parms
.raddr
)) {
1060 if (skb
->protocol
== htons(ETH_P_IPV6
)) {
1061 struct in6_addr
*addr6
;
1062 struct neighbour
*neigh
;
1066 goto tx_err_link_failure
;
1068 neigh
= dst_neigh_lookup(skb_dst(skb
),
1069 &ipv6_hdr(skb
)->daddr
);
1071 goto tx_err_link_failure
;
1073 addr6
= (struct in6_addr
*)&neigh
->primary_key
;
1074 addr_type
= ipv6_addr_type(addr6
);
1076 if (addr_type
== IPV6_ADDR_ANY
)
1077 addr6
= &ipv6_hdr(skb
)->daddr
;
1079 memcpy(&fl6
->daddr
, addr6
, sizeof(fl6
->daddr
));
1080 neigh_release(neigh
);
1082 } else if (!(t
->parms
.flags
&
1083 (IP6_TNL_F_USE_ORIG_TCLASS
| IP6_TNL_F_USE_ORIG_FWMARK
))) {
1084 /* enable the cache only only if the routing decision does
1085 * not depend on the current inner header value
1091 dst
= dst_cache_get(&t
->dst_cache
);
1093 if (!ip6_tnl_xmit_ctl(t
, &fl6
->saddr
, &fl6
->daddr
))
1094 goto tx_err_link_failure
;
1098 dst
= ip6_route_output(net
, NULL
, fl6
);
1101 goto tx_err_link_failure
;
1102 dst
= xfrm_lookup(net
, dst
, flowi6_to_flowi(fl6
), NULL
, 0);
1106 goto tx_err_link_failure
;
1108 if (t
->parms
.collect_md
&&
1109 ipv6_dev_get_saddr(net
, ip6_dst_idev(dst
)->dev
,
1110 &fl6
->daddr
, 0, &fl6
->saddr
))
1111 goto tx_err_link_failure
;
1118 stats
->collisions
++;
1119 net_warn_ratelimited("%s: Local routing loop detected!\n",
1121 goto tx_err_dst_release
;
1123 mtu
= dst_mtu(dst
) - psh_hlen
- t
->tun_hlen
;
1124 if (encap_limit
>= 0) {
1128 if (mtu
< IPV6_MIN_MTU
)
1130 if (skb_dst(skb
) && !t
->parms
.collect_md
)
1131 skb_dst(skb
)->ops
->update_pmtu(skb_dst(skb
), NULL
, skb
, mtu
);
1132 if (skb
->len
- t
->tun_hlen
> mtu
&& !skb_is_gso(skb
)) {
1135 goto tx_err_dst_release
;
1138 if (t
->err_count
> 0) {
1139 if (time_before(jiffies
,
1140 t
->err_time
+ IP6TUNNEL_ERR_TIMEO
)) {
1143 dst_link_failure(skb
);
1149 skb_scrub_packet(skb
, !net_eq(t
->net
, dev_net(dev
)));
1152 * Okay, now see if we can stuff it in the buffer as-is.
1154 max_headroom
+= LL_RESERVED_SPACE(tdev
);
1156 if (skb_headroom(skb
) < max_headroom
|| skb_shared(skb
) ||
1157 (skb_cloned(skb
) && !skb_clone_writable(skb
, 0))) {
1158 struct sk_buff
*new_skb
;
1160 new_skb
= skb_realloc_headroom(skb
, max_headroom
);
1162 goto tx_err_dst_release
;
1165 skb_set_owner_w(new_skb
, skb
->sk
);
1170 if (t
->parms
.collect_md
) {
1171 if (t
->encap
.type
!= TUNNEL_ENCAP_NONE
)
1172 goto tx_err_dst_release
;
1174 if (use_cache
&& ndst
)
1175 dst_cache_set_ip6(&t
->dst_cache
, ndst
, &fl6
->saddr
);
1177 skb_dst_set(skb
, dst
);
1179 if (encap_limit
>= 0) {
1180 init_tel_txopt(&opt
, encap_limit
);
1181 ipv6_push_frag_opts(skb
, &opt
.ops
, &proto
);
1184 /* Calculate max headroom for all the headers and adjust
1185 * needed_headroom if necessary.
1187 max_headroom
= LL_RESERVED_SPACE(dst
->dev
) + sizeof(struct ipv6hdr
)
1188 + dst
->header_len
+ t
->hlen
;
1189 if (max_headroom
> dev
->needed_headroom
)
1190 dev
->needed_headroom
= max_headroom
;
1192 err
= ip6_tnl_encap(skb
, t
, &proto
, fl6
);
1196 skb_push(skb
, sizeof(struct ipv6hdr
));
1197 skb_reset_network_header(skb
);
1198 ipv6h
= ipv6_hdr(skb
);
1199 ip6_flow_hdr(ipv6h
, INET_ECN_encapsulate(0, dsfield
),
1200 ip6_make_flowlabel(net
, skb
, fl6
->flowlabel
, true, fl6
));
1201 ipv6h
->hop_limit
= hop_limit
;
1202 ipv6h
->nexthdr
= proto
;
1203 ipv6h
->saddr
= fl6
->saddr
;
1204 ipv6h
->daddr
= fl6
->daddr
;
1205 ip6tunnel_xmit(NULL
, skb
, dev
);
1207 tx_err_link_failure
:
1208 stats
->tx_carrier_errors
++;
1209 dst_link_failure(skb
);
1214 EXPORT_SYMBOL(ip6_tnl_xmit
);
1217 ip4ip6_tnl_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
1219 struct ip6_tnl
*t
= netdev_priv(dev
);
1220 const struct iphdr
*iph
= ip_hdr(skb
);
1221 int encap_limit
= -1;
1228 memset(&(IPCB(skb
)->opt
), 0, sizeof(IPCB(skb
)->opt
));
1230 tproto
= ACCESS_ONCE(t
->parms
.proto
);
1231 if (tproto
!= IPPROTO_IPIP
&& tproto
!= 0)
1234 dsfield
= ipv4_get_dsfield(iph
);
1236 if (t
->parms
.collect_md
) {
1237 struct ip_tunnel_info
*tun_info
;
1238 const struct ip_tunnel_key
*key
;
1240 tun_info
= skb_tunnel_info(skb
);
1241 if (unlikely(!tun_info
|| !(tun_info
->mode
& IP_TUNNEL_INFO_TX
) ||
1242 ip_tunnel_info_af(tun_info
) != AF_INET6
))
1244 key
= &tun_info
->key
;
1245 memset(&fl6
, 0, sizeof(fl6
));
1246 fl6
.flowi6_proto
= IPPROTO_IPIP
;
1247 fl6
.daddr
= key
->u
.ipv6
.dst
;
1248 fl6
.flowlabel
= key
->label
;
1250 if (!(t
->parms
.flags
& IP6_TNL_F_IGN_ENCAP_LIMIT
))
1251 encap_limit
= t
->parms
.encap_limit
;
1253 memcpy(&fl6
, &t
->fl
.u
.ip6
, sizeof(fl6
));
1254 fl6
.flowi6_proto
= IPPROTO_IPIP
;
1256 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_TCLASS
)
1257 fl6
.flowlabel
|= htonl((__u32
)iph
->tos
<< IPV6_TCLASS_SHIFT
)
1259 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_FWMARK
)
1260 fl6
.flowi6_mark
= skb
->mark
;
1262 fl6
.flowi6_mark
= t
->parms
.fwmark
;
1265 fl6
.flowi6_uid
= sock_net_uid(dev_net(dev
), NULL
);
1267 if (iptunnel_handle_offloads(skb
, SKB_GSO_IPXIP6
))
1270 skb_set_inner_ipproto(skb
, IPPROTO_IPIP
);
1272 err
= ip6_tnl_xmit(skb
, dev
, dsfield
, &fl6
, encap_limit
, &mtu
,
1275 /* XXX: send ICMP error even if DF is not set. */
1276 if (err
== -EMSGSIZE
)
1277 icmp_send(skb
, ICMP_DEST_UNREACH
, ICMP_FRAG_NEEDED
,
1286 ip6ip6_tnl_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
1288 struct ip6_tnl
*t
= netdev_priv(dev
);
1289 struct ipv6hdr
*ipv6h
= ipv6_hdr(skb
);
1290 int encap_limit
= -1;
1298 tproto
= ACCESS_ONCE(t
->parms
.proto
);
1299 if ((tproto
!= IPPROTO_IPV6
&& tproto
!= 0) ||
1300 ip6_tnl_addr_conflict(t
, ipv6h
))
1303 dsfield
= ipv6_get_dsfield(ipv6h
);
1305 if (t
->parms
.collect_md
) {
1306 struct ip_tunnel_info
*tun_info
;
1307 const struct ip_tunnel_key
*key
;
1309 tun_info
= skb_tunnel_info(skb
);
1310 if (unlikely(!tun_info
|| !(tun_info
->mode
& IP_TUNNEL_INFO_TX
) ||
1311 ip_tunnel_info_af(tun_info
) != AF_INET6
))
1313 key
= &tun_info
->key
;
1314 memset(&fl6
, 0, sizeof(fl6
));
1315 fl6
.flowi6_proto
= IPPROTO_IPV6
;
1316 fl6
.daddr
= key
->u
.ipv6
.dst
;
1317 fl6
.flowlabel
= key
->label
;
1319 offset
= ip6_tnl_parse_tlv_enc_lim(skb
, skb_network_header(skb
));
1320 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
1321 ipv6h
= ipv6_hdr(skb
);
1323 struct ipv6_tlv_tnl_enc_lim
*tel
;
1325 tel
= (void *)&skb_network_header(skb
)[offset
];
1326 if (tel
->encap_limit
== 0) {
1327 icmpv6_send(skb
, ICMPV6_PARAMPROB
,
1328 ICMPV6_HDR_FIELD
, offset
+ 2);
1331 encap_limit
= tel
->encap_limit
- 1;
1332 } else if (!(t
->parms
.flags
& IP6_TNL_F_IGN_ENCAP_LIMIT
)) {
1333 encap_limit
= t
->parms
.encap_limit
;
1336 memcpy(&fl6
, &t
->fl
.u
.ip6
, sizeof(fl6
));
1337 fl6
.flowi6_proto
= IPPROTO_IPV6
;
1339 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_TCLASS
)
1340 fl6
.flowlabel
|= (*(__be32
*)ipv6h
& IPV6_TCLASS_MASK
);
1341 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_FLOWLABEL
)
1342 fl6
.flowlabel
|= ip6_flowlabel(ipv6h
);
1343 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_FWMARK
)
1344 fl6
.flowi6_mark
= skb
->mark
;
1346 fl6
.flowi6_mark
= t
->parms
.fwmark
;
1349 fl6
.flowi6_uid
= sock_net_uid(dev_net(dev
), NULL
);
1351 if (iptunnel_handle_offloads(skb
, SKB_GSO_IPXIP6
))
1354 skb_set_inner_ipproto(skb
, IPPROTO_IPV6
);
1356 err
= ip6_tnl_xmit(skb
, dev
, dsfield
, &fl6
, encap_limit
, &mtu
,
1359 if (err
== -EMSGSIZE
)
1360 icmpv6_send(skb
, ICMPV6_PKT_TOOBIG
, 0, mtu
);
1368 ip6_tnl_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
1370 struct ip6_tnl
*t
= netdev_priv(dev
);
1371 struct net_device_stats
*stats
= &t
->dev
->stats
;
1374 switch (skb
->protocol
) {
1375 case htons(ETH_P_IP
):
1376 ret
= ip4ip6_tnl_xmit(skb
, dev
);
1378 case htons(ETH_P_IPV6
):
1379 ret
= ip6ip6_tnl_xmit(skb
, dev
);
1388 return NETDEV_TX_OK
;
1392 stats
->tx_dropped
++;
1394 return NETDEV_TX_OK
;
1397 static void ip6_tnl_link_config(struct ip6_tnl
*t
)
1399 struct net_device
*dev
= t
->dev
;
1400 struct __ip6_tnl_parm
*p
= &t
->parms
;
1401 struct flowi6
*fl6
= &t
->fl
.u
.ip6
;
1404 memcpy(dev
->dev_addr
, &p
->laddr
, sizeof(struct in6_addr
));
1405 memcpy(dev
->broadcast
, &p
->raddr
, sizeof(struct in6_addr
));
1407 /* Set up flowi template */
1408 fl6
->saddr
= p
->laddr
;
1409 fl6
->daddr
= p
->raddr
;
1410 fl6
->flowi6_oif
= p
->link
;
1413 if (!(p
->flags
&IP6_TNL_F_USE_ORIG_TCLASS
))
1414 fl6
->flowlabel
|= IPV6_TCLASS_MASK
& p
->flowinfo
;
1415 if (!(p
->flags
&IP6_TNL_F_USE_ORIG_FLOWLABEL
))
1416 fl6
->flowlabel
|= IPV6_FLOWLABEL_MASK
& p
->flowinfo
;
1418 p
->flags
&= ~(IP6_TNL_F_CAP_XMIT
|IP6_TNL_F_CAP_RCV
|IP6_TNL_F_CAP_PER_PACKET
);
1419 p
->flags
|= ip6_tnl_get_cap(t
, &p
->laddr
, &p
->raddr
);
1421 if (p
->flags
&IP6_TNL_F_CAP_XMIT
&& p
->flags
&IP6_TNL_F_CAP_RCV
)
1422 dev
->flags
|= IFF_POINTOPOINT
;
1424 dev
->flags
&= ~IFF_POINTOPOINT
;
1427 t
->hlen
= t
->encap_hlen
+ t
->tun_hlen
;
1428 t_hlen
= t
->hlen
+ sizeof(struct ipv6hdr
);
1430 if (p
->flags
& IP6_TNL_F_CAP_XMIT
) {
1431 int strict
= (ipv6_addr_type(&p
->raddr
) &
1432 (IPV6_ADDR_MULTICAST
|IPV6_ADDR_LINKLOCAL
));
1434 struct rt6_info
*rt
= rt6_lookup(t
->net
,
1435 &p
->raddr
, &p
->laddr
,
1442 dev
->hard_header_len
= rt
->dst
.dev
->hard_header_len
+
1445 dev
->mtu
= rt
->dst
.dev
->mtu
- t_hlen
;
1446 if (!(t
->parms
.flags
& IP6_TNL_F_IGN_ENCAP_LIMIT
))
1449 if (dev
->mtu
< IPV6_MIN_MTU
)
1450 dev
->mtu
= IPV6_MIN_MTU
;
1457 * ip6_tnl_change - update the tunnel parameters
1458 * @t: tunnel to be changed
1459 * @p: tunnel configuration parameters
1462 * ip6_tnl_change() updates the tunnel parameters
1466 ip6_tnl_change(struct ip6_tnl
*t
, const struct __ip6_tnl_parm
*p
)
1468 t
->parms
.laddr
= p
->laddr
;
1469 t
->parms
.raddr
= p
->raddr
;
1470 t
->parms
.flags
= p
->flags
;
1471 t
->parms
.hop_limit
= p
->hop_limit
;
1472 t
->parms
.encap_limit
= p
->encap_limit
;
1473 t
->parms
.flowinfo
= p
->flowinfo
;
1474 t
->parms
.link
= p
->link
;
1475 t
->parms
.proto
= p
->proto
;
1476 t
->parms
.fwmark
= p
->fwmark
;
1477 dst_cache_reset(&t
->dst_cache
);
1478 ip6_tnl_link_config(t
);
1482 static int ip6_tnl_update(struct ip6_tnl
*t
, struct __ip6_tnl_parm
*p
)
1484 struct net
*net
= t
->net
;
1485 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
1488 ip6_tnl_unlink(ip6n
, t
);
1490 err
= ip6_tnl_change(t
, p
);
1491 ip6_tnl_link(ip6n
, t
);
1492 netdev_state_change(t
->dev
);
1496 static int ip6_tnl0_update(struct ip6_tnl
*t
, struct __ip6_tnl_parm
*p
)
1498 /* for default tnl0 device allow to change only the proto */
1499 t
->parms
.proto
= p
->proto
;
1500 netdev_state_change(t
->dev
);
1505 ip6_tnl_parm_from_user(struct __ip6_tnl_parm
*p
, const struct ip6_tnl_parm
*u
)
1507 p
->laddr
= u
->laddr
;
1508 p
->raddr
= u
->raddr
;
1509 p
->flags
= u
->flags
;
1510 p
->hop_limit
= u
->hop_limit
;
1511 p
->encap_limit
= u
->encap_limit
;
1512 p
->flowinfo
= u
->flowinfo
;
1514 p
->proto
= u
->proto
;
1515 memcpy(p
->name
, u
->name
, sizeof(u
->name
));
1519 ip6_tnl_parm_to_user(struct ip6_tnl_parm
*u
, const struct __ip6_tnl_parm
*p
)
1521 u
->laddr
= p
->laddr
;
1522 u
->raddr
= p
->raddr
;
1523 u
->flags
= p
->flags
;
1524 u
->hop_limit
= p
->hop_limit
;
1525 u
->encap_limit
= p
->encap_limit
;
1526 u
->flowinfo
= p
->flowinfo
;
1528 u
->proto
= p
->proto
;
1529 memcpy(u
->name
, p
->name
, sizeof(u
->name
));
1533 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
1534 * @dev: virtual device associated with tunnel
1535 * @ifr: parameters passed from userspace
1536 * @cmd: command to be performed
1539 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
1542 * The possible commands are the following:
1543 * %SIOCGETTUNNEL: get tunnel parameters for device
1544 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1545 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1546 * %SIOCDELTUNNEL: delete tunnel
1548 * The fallback device "ip6tnl0", created during module
1549 * initialization, can be used for creating other tunnel devices.
1553 * %-EFAULT if unable to copy data to or from userspace,
1554 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1555 * %-EINVAL if passed tunnel parameters are invalid,
1556 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1557 * %-ENODEV if attempting to change or delete a nonexisting device
1561 ip6_tnl_ioctl(struct net_device
*dev
, struct ifreq
*ifr
, int cmd
)
1564 struct ip6_tnl_parm p
;
1565 struct __ip6_tnl_parm p1
;
1566 struct ip6_tnl
*t
= netdev_priv(dev
);
1567 struct net
*net
= t
->net
;
1568 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
1570 memset(&p1
, 0, sizeof(p1
));
1574 if (dev
== ip6n
->fb_tnl_dev
) {
1575 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
))) {
1579 ip6_tnl_parm_from_user(&p1
, &p
);
1580 t
= ip6_tnl_locate(net
, &p1
, 0);
1582 t
= netdev_priv(dev
);
1584 memset(&p
, 0, sizeof(p
));
1586 ip6_tnl_parm_to_user(&p
, &t
->parms
);
1587 if (copy_to_user(ifr
->ifr_ifru
.ifru_data
, &p
, sizeof(p
))) {
1594 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
1597 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
)))
1600 if (p
.proto
!= IPPROTO_IPV6
&& p
.proto
!= IPPROTO_IPIP
&&
1603 ip6_tnl_parm_from_user(&p1
, &p
);
1604 t
= ip6_tnl_locate(net
, &p1
, cmd
== SIOCADDTUNNEL
);
1605 if (cmd
== SIOCCHGTUNNEL
) {
1607 if (t
->dev
!= dev
) {
1612 t
= netdev_priv(dev
);
1613 if (dev
== ip6n
->fb_tnl_dev
)
1614 err
= ip6_tnl0_update(t
, &p1
);
1616 err
= ip6_tnl_update(t
, &p1
);
1620 ip6_tnl_parm_to_user(&p
, &t
->parms
);
1621 if (copy_to_user(ifr
->ifr_ifru
.ifru_data
, &p
, sizeof(p
)))
1630 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
1633 if (dev
== ip6n
->fb_tnl_dev
) {
1635 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
)))
1638 ip6_tnl_parm_from_user(&p1
, &p
);
1639 t
= ip6_tnl_locate(net
, &p1
, 0);
1643 if (t
->dev
== ip6n
->fb_tnl_dev
)
1648 unregister_netdevice(dev
);
1657 * ip6_tnl_change_mtu - change mtu manually for tunnel device
1658 * @dev: virtual device associated with tunnel
1659 * @new_mtu: the new mtu
1663 * %-EINVAL if mtu too small
1666 int ip6_tnl_change_mtu(struct net_device
*dev
, int new_mtu
)
1668 struct ip6_tnl
*tnl
= netdev_priv(dev
);
1670 if (tnl
->parms
.proto
== IPPROTO_IPIP
) {
1671 if (new_mtu
< ETH_MIN_MTU
)
1674 if (new_mtu
< IPV6_MIN_MTU
)
1677 if (new_mtu
> 0xFFF8 - dev
->hard_header_len
)
1682 EXPORT_SYMBOL(ip6_tnl_change_mtu
);
1684 int ip6_tnl_get_iflink(const struct net_device
*dev
)
1686 struct ip6_tnl
*t
= netdev_priv(dev
);
1688 return t
->parms
.link
;
1690 EXPORT_SYMBOL(ip6_tnl_get_iflink
);
1692 int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops
*ops
,
1695 if (num
>= MAX_IPTUN_ENCAP_OPS
)
1698 return !cmpxchg((const struct ip6_tnl_encap_ops
**)
1699 &ip6tun_encaps
[num
],
1700 NULL
, ops
) ? 0 : -1;
1702 EXPORT_SYMBOL(ip6_tnl_encap_add_ops
);
1704 int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops
*ops
,
1709 if (num
>= MAX_IPTUN_ENCAP_OPS
)
1712 ret
= (cmpxchg((const struct ip6_tnl_encap_ops
**)
1713 &ip6tun_encaps
[num
],
1714 ops
, NULL
) == ops
) ? 0 : -1;
1720 EXPORT_SYMBOL(ip6_tnl_encap_del_ops
);
1722 int ip6_tnl_encap_setup(struct ip6_tnl
*t
,
1723 struct ip_tunnel_encap
*ipencap
)
1727 memset(&t
->encap
, 0, sizeof(t
->encap
));
1729 hlen
= ip6_encap_hlen(ipencap
);
1733 t
->encap
.type
= ipencap
->type
;
1734 t
->encap
.sport
= ipencap
->sport
;
1735 t
->encap
.dport
= ipencap
->dport
;
1736 t
->encap
.flags
= ipencap
->flags
;
1738 t
->encap_hlen
= hlen
;
1739 t
->hlen
= t
->encap_hlen
+ t
->tun_hlen
;
1743 EXPORT_SYMBOL_GPL(ip6_tnl_encap_setup
);
1745 static const struct net_device_ops ip6_tnl_netdev_ops
= {
1746 .ndo_init
= ip6_tnl_dev_init
,
1747 .ndo_uninit
= ip6_tnl_dev_uninit
,
1748 .ndo_start_xmit
= ip6_tnl_start_xmit
,
1749 .ndo_do_ioctl
= ip6_tnl_ioctl
,
1750 .ndo_change_mtu
= ip6_tnl_change_mtu
,
1751 .ndo_get_stats
= ip6_get_stats
,
1752 .ndo_get_iflink
= ip6_tnl_get_iflink
,
1755 #define IPXIPX_FEATURES (NETIF_F_SG | \
1756 NETIF_F_FRAGLIST | \
1758 NETIF_F_GSO_SOFTWARE | \
1762 * ip6_tnl_dev_setup - setup virtual tunnel device
1763 * @dev: virtual device associated with tunnel
1766 * Initialize function pointers and device parameters
1769 static void ip6_tnl_dev_setup(struct net_device
*dev
)
1771 dev
->netdev_ops
= &ip6_tnl_netdev_ops
;
1772 dev
->destructor
= ip6_dev_free
;
1774 dev
->type
= ARPHRD_TUNNEL6
;
1775 dev
->flags
|= IFF_NOARP
;
1776 dev
->addr_len
= sizeof(struct in6_addr
);
1777 dev
->features
|= NETIF_F_LLTX
;
1778 netif_keep_dst(dev
);
1780 dev
->features
|= IPXIPX_FEATURES
;
1781 dev
->hw_features
|= IPXIPX_FEATURES
;
1783 /* This perm addr will be used as interface identifier by IPv6 */
1784 dev
->addr_assign_type
= NET_ADDR_RANDOM
;
1785 eth_random_addr(dev
->perm_addr
);
1790 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
1791 * @dev: virtual device associated with tunnel
1795 ip6_tnl_dev_init_gen(struct net_device
*dev
)
1797 struct ip6_tnl
*t
= netdev_priv(dev
);
1802 t
->net
= dev_net(dev
);
1803 dev
->tstats
= netdev_alloc_pcpu_stats(struct pcpu_sw_netstats
);
1807 ret
= dst_cache_init(&t
->dst_cache
, GFP_KERNEL
);
1811 ret
= gro_cells_init(&t
->gro_cells
, dev
);
1816 t
->hlen
= t
->encap_hlen
+ t
->tun_hlen
;
1817 t_hlen
= t
->hlen
+ sizeof(struct ipv6hdr
);
1819 dev
->type
= ARPHRD_TUNNEL6
;
1820 dev
->hard_header_len
= LL_MAX_HEADER
+ t_hlen
;
1821 dev
->mtu
= ETH_DATA_LEN
- t_hlen
;
1822 if (!(t
->parms
.flags
& IP6_TNL_F_IGN_ENCAP_LIMIT
))
1824 dev
->min_mtu
= ETH_MIN_MTU
;
1825 dev
->max_mtu
= 0xFFF8 - dev
->hard_header_len
;
1830 dst_cache_destroy(&t
->dst_cache
);
1832 free_percpu(dev
->tstats
);
1839 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
1840 * @dev: virtual device associated with tunnel
1843 static int ip6_tnl_dev_init(struct net_device
*dev
)
1845 struct ip6_tnl
*t
= netdev_priv(dev
);
1846 int err
= ip6_tnl_dev_init_gen(dev
);
1850 ip6_tnl_link_config(t
);
1851 if (t
->parms
.collect_md
) {
1852 dev
->features
|= NETIF_F_NETNS_LOCAL
;
1853 netif_keep_dst(dev
);
1859 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
1860 * @dev: fallback device
1865 static int __net_init
ip6_fb_tnl_dev_init(struct net_device
*dev
)
1867 struct ip6_tnl
*t
= netdev_priv(dev
);
1868 struct net
*net
= dev_net(dev
);
1869 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
1871 t
->parms
.proto
= IPPROTO_IPV6
;
1874 rcu_assign_pointer(ip6n
->tnls_wc
[0], t
);
1878 static int ip6_tnl_validate(struct nlattr
*tb
[], struct nlattr
*data
[])
1882 if (!data
|| !data
[IFLA_IPTUN_PROTO
])
1885 proto
= nla_get_u8(data
[IFLA_IPTUN_PROTO
]);
1886 if (proto
!= IPPROTO_IPV6
&&
1887 proto
!= IPPROTO_IPIP
&&
1894 static void ip6_tnl_netlink_parms(struct nlattr
*data
[],
1895 struct __ip6_tnl_parm
*parms
)
1897 memset(parms
, 0, sizeof(*parms
));
1902 if (data
[IFLA_IPTUN_LINK
])
1903 parms
->link
= nla_get_u32(data
[IFLA_IPTUN_LINK
]);
1905 if (data
[IFLA_IPTUN_LOCAL
])
1906 parms
->laddr
= nla_get_in6_addr(data
[IFLA_IPTUN_LOCAL
]);
1908 if (data
[IFLA_IPTUN_REMOTE
])
1909 parms
->raddr
= nla_get_in6_addr(data
[IFLA_IPTUN_REMOTE
]);
1911 if (data
[IFLA_IPTUN_TTL
])
1912 parms
->hop_limit
= nla_get_u8(data
[IFLA_IPTUN_TTL
]);
1914 if (data
[IFLA_IPTUN_ENCAP_LIMIT
])
1915 parms
->encap_limit
= nla_get_u8(data
[IFLA_IPTUN_ENCAP_LIMIT
]);
1917 if (data
[IFLA_IPTUN_FLOWINFO
])
1918 parms
->flowinfo
= nla_get_be32(data
[IFLA_IPTUN_FLOWINFO
]);
1920 if (data
[IFLA_IPTUN_FLAGS
])
1921 parms
->flags
= nla_get_u32(data
[IFLA_IPTUN_FLAGS
]);
1923 if (data
[IFLA_IPTUN_PROTO
])
1924 parms
->proto
= nla_get_u8(data
[IFLA_IPTUN_PROTO
]);
1926 if (data
[IFLA_IPTUN_COLLECT_METADATA
])
1927 parms
->collect_md
= true;
1929 if (data
[IFLA_IPTUN_FWMARK
])
1930 parms
->fwmark
= nla_get_u32(data
[IFLA_IPTUN_FWMARK
]);
1933 static bool ip6_tnl_netlink_encap_parms(struct nlattr
*data
[],
1934 struct ip_tunnel_encap
*ipencap
)
1938 memset(ipencap
, 0, sizeof(*ipencap
));
1943 if (data
[IFLA_IPTUN_ENCAP_TYPE
]) {
1945 ipencap
->type
= nla_get_u16(data
[IFLA_IPTUN_ENCAP_TYPE
]);
1948 if (data
[IFLA_IPTUN_ENCAP_FLAGS
]) {
1950 ipencap
->flags
= nla_get_u16(data
[IFLA_IPTUN_ENCAP_FLAGS
]);
1953 if (data
[IFLA_IPTUN_ENCAP_SPORT
]) {
1955 ipencap
->sport
= nla_get_be16(data
[IFLA_IPTUN_ENCAP_SPORT
]);
1958 if (data
[IFLA_IPTUN_ENCAP_DPORT
]) {
1960 ipencap
->dport
= nla_get_be16(data
[IFLA_IPTUN_ENCAP_DPORT
]);
1966 static int ip6_tnl_newlink(struct net
*src_net
, struct net_device
*dev
,
1967 struct nlattr
*tb
[], struct nlattr
*data
[])
1969 struct net
*net
= dev_net(dev
);
1970 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
1971 struct ip6_tnl
*nt
, *t
;
1972 struct ip_tunnel_encap ipencap
;
1974 nt
= netdev_priv(dev
);
1976 if (ip6_tnl_netlink_encap_parms(data
, &ipencap
)) {
1977 int err
= ip6_tnl_encap_setup(nt
, &ipencap
);
1983 ip6_tnl_netlink_parms(data
, &nt
->parms
);
1985 if (nt
->parms
.collect_md
) {
1986 if (rtnl_dereference(ip6n
->collect_md_tun
))
1989 t
= ip6_tnl_locate(net
, &nt
->parms
, 0);
1994 return ip6_tnl_create2(dev
);
1997 static int ip6_tnl_changelink(struct net_device
*dev
, struct nlattr
*tb
[],
1998 struct nlattr
*data
[])
2000 struct ip6_tnl
*t
= netdev_priv(dev
);
2001 struct __ip6_tnl_parm p
;
2002 struct net
*net
= t
->net
;
2003 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
2004 struct ip_tunnel_encap ipencap
;
2006 if (dev
== ip6n
->fb_tnl_dev
)
2009 if (ip6_tnl_netlink_encap_parms(data
, &ipencap
)) {
2010 int err
= ip6_tnl_encap_setup(t
, &ipencap
);
2015 ip6_tnl_netlink_parms(data
, &p
);
2019 t
= ip6_tnl_locate(net
, &p
, 0);
2024 t
= netdev_priv(dev
);
2026 return ip6_tnl_update(t
, &p
);
2029 static void ip6_tnl_dellink(struct net_device
*dev
, struct list_head
*head
)
2031 struct net
*net
= dev_net(dev
);
2032 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
2034 if (dev
!= ip6n
->fb_tnl_dev
)
2035 unregister_netdevice_queue(dev
, head
);
2038 static size_t ip6_tnl_get_size(const struct net_device
*dev
)
2041 /* IFLA_IPTUN_LINK */
2043 /* IFLA_IPTUN_LOCAL */
2044 nla_total_size(sizeof(struct in6_addr
)) +
2045 /* IFLA_IPTUN_REMOTE */
2046 nla_total_size(sizeof(struct in6_addr
)) +
2047 /* IFLA_IPTUN_TTL */
2049 /* IFLA_IPTUN_ENCAP_LIMIT */
2051 /* IFLA_IPTUN_FLOWINFO */
2053 /* IFLA_IPTUN_FLAGS */
2055 /* IFLA_IPTUN_PROTO */
2057 /* IFLA_IPTUN_ENCAP_TYPE */
2059 /* IFLA_IPTUN_ENCAP_FLAGS */
2061 /* IFLA_IPTUN_ENCAP_SPORT */
2063 /* IFLA_IPTUN_ENCAP_DPORT */
2065 /* IFLA_IPTUN_COLLECT_METADATA */
2067 /* IFLA_IPTUN_FWMARK */
2072 static int ip6_tnl_fill_info(struct sk_buff
*skb
, const struct net_device
*dev
)
2074 struct ip6_tnl
*tunnel
= netdev_priv(dev
);
2075 struct __ip6_tnl_parm
*parm
= &tunnel
->parms
;
2077 if (nla_put_u32(skb
, IFLA_IPTUN_LINK
, parm
->link
) ||
2078 nla_put_in6_addr(skb
, IFLA_IPTUN_LOCAL
, &parm
->laddr
) ||
2079 nla_put_in6_addr(skb
, IFLA_IPTUN_REMOTE
, &parm
->raddr
) ||
2080 nla_put_u8(skb
, IFLA_IPTUN_TTL
, parm
->hop_limit
) ||
2081 nla_put_u8(skb
, IFLA_IPTUN_ENCAP_LIMIT
, parm
->encap_limit
) ||
2082 nla_put_be32(skb
, IFLA_IPTUN_FLOWINFO
, parm
->flowinfo
) ||
2083 nla_put_u32(skb
, IFLA_IPTUN_FLAGS
, parm
->flags
) ||
2084 nla_put_u8(skb
, IFLA_IPTUN_PROTO
, parm
->proto
) ||
2085 nla_put_u32(skb
, IFLA_IPTUN_FWMARK
, parm
->fwmark
))
2086 goto nla_put_failure
;
2088 if (nla_put_u16(skb
, IFLA_IPTUN_ENCAP_TYPE
, tunnel
->encap
.type
) ||
2089 nla_put_be16(skb
, IFLA_IPTUN_ENCAP_SPORT
, tunnel
->encap
.sport
) ||
2090 nla_put_be16(skb
, IFLA_IPTUN_ENCAP_DPORT
, tunnel
->encap
.dport
) ||
2091 nla_put_u16(skb
, IFLA_IPTUN_ENCAP_FLAGS
, tunnel
->encap
.flags
))
2092 goto nla_put_failure
;
2094 if (parm
->collect_md
)
2095 if (nla_put_flag(skb
, IFLA_IPTUN_COLLECT_METADATA
))
2096 goto nla_put_failure
;
2104 struct net
*ip6_tnl_get_link_net(const struct net_device
*dev
)
2106 struct ip6_tnl
*tunnel
= netdev_priv(dev
);
2110 EXPORT_SYMBOL(ip6_tnl_get_link_net
);
2112 static const struct nla_policy ip6_tnl_policy
[IFLA_IPTUN_MAX
+ 1] = {
2113 [IFLA_IPTUN_LINK
] = { .type
= NLA_U32
},
2114 [IFLA_IPTUN_LOCAL
] = { .len
= sizeof(struct in6_addr
) },
2115 [IFLA_IPTUN_REMOTE
] = { .len
= sizeof(struct in6_addr
) },
2116 [IFLA_IPTUN_TTL
] = { .type
= NLA_U8
},
2117 [IFLA_IPTUN_ENCAP_LIMIT
] = { .type
= NLA_U8
},
2118 [IFLA_IPTUN_FLOWINFO
] = { .type
= NLA_U32
},
2119 [IFLA_IPTUN_FLAGS
] = { .type
= NLA_U32
},
2120 [IFLA_IPTUN_PROTO
] = { .type
= NLA_U8
},
2121 [IFLA_IPTUN_ENCAP_TYPE
] = { .type
= NLA_U16
},
2122 [IFLA_IPTUN_ENCAP_FLAGS
] = { .type
= NLA_U16
},
2123 [IFLA_IPTUN_ENCAP_SPORT
] = { .type
= NLA_U16
},
2124 [IFLA_IPTUN_ENCAP_DPORT
] = { .type
= NLA_U16
},
2125 [IFLA_IPTUN_COLLECT_METADATA
] = { .type
= NLA_FLAG
},
2126 [IFLA_IPTUN_FWMARK
] = { .type
= NLA_U32
},
2129 static struct rtnl_link_ops ip6_link_ops __read_mostly
= {
2131 .maxtype
= IFLA_IPTUN_MAX
,
2132 .policy
= ip6_tnl_policy
,
2133 .priv_size
= sizeof(struct ip6_tnl
),
2134 .setup
= ip6_tnl_dev_setup
,
2135 .validate
= ip6_tnl_validate
,
2136 .newlink
= ip6_tnl_newlink
,
2137 .changelink
= ip6_tnl_changelink
,
2138 .dellink
= ip6_tnl_dellink
,
2139 .get_size
= ip6_tnl_get_size
,
2140 .fill_info
= ip6_tnl_fill_info
,
2141 .get_link_net
= ip6_tnl_get_link_net
,
2144 static struct xfrm6_tunnel ip4ip6_handler __read_mostly
= {
2145 .handler
= ip4ip6_rcv
,
2146 .err_handler
= ip4ip6_err
,
2150 static struct xfrm6_tunnel ip6ip6_handler __read_mostly
= {
2151 .handler
= ip6ip6_rcv
,
2152 .err_handler
= ip6ip6_err
,
2156 static void __net_exit
ip6_tnl_destroy_tunnels(struct net
*net
)
2158 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
2159 struct net_device
*dev
, *aux
;
2164 for_each_netdev_safe(net
, dev
, aux
)
2165 if (dev
->rtnl_link_ops
== &ip6_link_ops
)
2166 unregister_netdevice_queue(dev
, &list
);
2168 for (h
= 0; h
< IP6_TUNNEL_HASH_SIZE
; h
++) {
2169 t
= rtnl_dereference(ip6n
->tnls_r_l
[h
]);
2171 /* If dev is in the same netns, it has already
2172 * been added to the list by the previous loop.
2174 if (!net_eq(dev_net(t
->dev
), net
))
2175 unregister_netdevice_queue(t
->dev
, &list
);
2176 t
= rtnl_dereference(t
->next
);
2180 unregister_netdevice_many(&list
);
2183 static int __net_init
ip6_tnl_init_net(struct net
*net
)
2185 struct ip6_tnl_net
*ip6n
= net_generic(net
, ip6_tnl_net_id
);
2186 struct ip6_tnl
*t
= NULL
;
2189 ip6n
->tnls
[0] = ip6n
->tnls_wc
;
2190 ip6n
->tnls
[1] = ip6n
->tnls_r_l
;
2193 ip6n
->fb_tnl_dev
= alloc_netdev(sizeof(struct ip6_tnl
), "ip6tnl0",
2194 NET_NAME_UNKNOWN
, ip6_tnl_dev_setup
);
2196 if (!ip6n
->fb_tnl_dev
)
2198 dev_net_set(ip6n
->fb_tnl_dev
, net
);
2199 ip6n
->fb_tnl_dev
->rtnl_link_ops
= &ip6_link_ops
;
2200 /* FB netdevice is special: we have one, and only one per netns.
2201 * Allowing to move it to another netns is clearly unsafe.
2203 ip6n
->fb_tnl_dev
->features
|= NETIF_F_NETNS_LOCAL
;
2205 err
= ip6_fb_tnl_dev_init(ip6n
->fb_tnl_dev
);
2209 err
= register_netdev(ip6n
->fb_tnl_dev
);
2213 t
= netdev_priv(ip6n
->fb_tnl_dev
);
2215 strcpy(t
->parms
.name
, ip6n
->fb_tnl_dev
->name
);
2219 ip6_dev_free(ip6n
->fb_tnl_dev
);
2224 static void __net_exit
ip6_tnl_exit_net(struct net
*net
)
2227 ip6_tnl_destroy_tunnels(net
);
2231 static struct pernet_operations ip6_tnl_net_ops
= {
2232 .init
= ip6_tnl_init_net
,
2233 .exit
= ip6_tnl_exit_net
,
2234 .id
= &ip6_tnl_net_id
,
2235 .size
= sizeof(struct ip6_tnl_net
),
2239 * ip6_tunnel_init - register protocol and reserve needed resources
2241 * Return: 0 on success
2244 static int __init
ip6_tunnel_init(void)
2248 err
= register_pernet_device(&ip6_tnl_net_ops
);
2252 err
= xfrm6_tunnel_register(&ip4ip6_handler
, AF_INET
);
2254 pr_err("%s: can't register ip4ip6\n", __func__
);
2258 err
= xfrm6_tunnel_register(&ip6ip6_handler
, AF_INET6
);
2260 pr_err("%s: can't register ip6ip6\n", __func__
);
2263 err
= rtnl_link_register(&ip6_link_ops
);
2265 goto rtnl_link_failed
;
2270 xfrm6_tunnel_deregister(&ip6ip6_handler
, AF_INET6
);
2272 xfrm6_tunnel_deregister(&ip4ip6_handler
, AF_INET
);
2274 unregister_pernet_device(&ip6_tnl_net_ops
);
2280 * ip6_tunnel_cleanup - free resources and unregister protocol
2283 static void __exit
ip6_tunnel_cleanup(void)
2285 rtnl_link_unregister(&ip6_link_ops
);
2286 if (xfrm6_tunnel_deregister(&ip4ip6_handler
, AF_INET
))
2287 pr_info("%s: can't deregister ip4ip6\n", __func__
);
2289 if (xfrm6_tunnel_deregister(&ip6ip6_handler
, AF_INET6
))
2290 pr_info("%s: can't deregister ip6ip6\n", __func__
);
2292 unregister_pernet_device(&ip6_tnl_net_ops
);
2295 module_init(ip6_tunnel_init
);
2296 module_exit(ip6_tunnel_cleanup
);