2 * GRE over IPv6 protocol decoder.
4 * Authors: Dmitry Kozlov (xeb@mail.ru)
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15 #include <linux/capability.h>
16 #include <linux/module.h>
17 #include <linux/types.h>
18 #include <linux/kernel.h>
19 #include <linux/slab.h>
20 #include <linux/uaccess.h>
21 #include <linux/skbuff.h>
22 #include <linux/netdevice.h>
24 #include <linux/tcp.h>
25 #include <linux/udp.h>
26 #include <linux/if_arp.h>
27 #include <linux/mroute.h>
28 #include <linux/init.h>
29 #include <linux/in6.h>
30 #include <linux/inetdevice.h>
31 #include <linux/igmp.h>
32 #include <linux/netfilter_ipv4.h>
33 #include <linux/etherdevice.h>
34 #include <linux/if_ether.h>
35 #include <linux/hash.h>
36 #include <linux/if_tunnel.h>
37 #include <linux/ip6_tunnel.h>
41 #include <net/ip_tunnels.h>
43 #include <net/protocol.h>
44 #include <net/addrconf.h>
46 #include <net/checksum.h>
47 #include <net/dsfield.h>
48 #include <net/inet_ecn.h>
50 #include <net/net_namespace.h>
51 #include <net/netns/generic.h>
52 #include <net/rtnetlink.h>
55 #include <net/ip6_fib.h>
56 #include <net/ip6_route.h>
57 #include <net/ip6_tunnel.h>
60 static bool log_ecn_error
= true;
61 module_param(log_ecn_error
, bool, 0644);
62 MODULE_PARM_DESC(log_ecn_error
, "Log packets received with corrupted ECN");
64 #define HASH_SIZE_SHIFT 5
65 #define HASH_SIZE (1 << HASH_SIZE_SHIFT)
67 static int ip6gre_net_id __read_mostly
;
69 struct ip6_tnl __rcu
*tunnels
[4][HASH_SIZE
];
71 struct net_device
*fb_tunnel_dev
;
74 static struct rtnl_link_ops ip6gre_link_ops __read_mostly
;
75 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly
;
76 static int ip6gre_tunnel_init(struct net_device
*dev
);
77 static void ip6gre_tunnel_setup(struct net_device
*dev
);
78 static void ip6gre_tunnel_link(struct ip6gre_net
*ign
, struct ip6_tnl
*t
);
79 static void ip6gre_tnl_link_config(struct ip6_tnl
*t
, int set_mtu
);
81 /* Tunnel hash table */
91 We require exact key match i.e. if a key is present in packet
92 it will match only tunnel with the same key; if it is not present,
93 it will match only keyless tunnel.
95 All keysless packets, if not matched configured keyless tunnels
96 will match fallback tunnel.
99 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(HASH_SIZE - 1))
100 static u32
HASH_ADDR(const struct in6_addr
*addr
)
102 u32 hash
= ipv6_addr_hash(addr
);
104 return hash_32(hash
, HASH_SIZE_SHIFT
);
107 #define tunnels_r_l tunnels[3]
108 #define tunnels_r tunnels[2]
109 #define tunnels_l tunnels[1]
110 #define tunnels_wc tunnels[0]
112 /* Given src, dst and key, find appropriate for input tunnel. */
114 static struct ip6_tnl
*ip6gre_tunnel_lookup(struct net_device
*dev
,
115 const struct in6_addr
*remote
, const struct in6_addr
*local
,
116 __be32 key
, __be16 gre_proto
)
118 struct net
*net
= dev_net(dev
);
119 int link
= dev
->ifindex
;
120 unsigned int h0
= HASH_ADDR(remote
);
121 unsigned int h1
= HASH_KEY(key
);
122 struct ip6_tnl
*t
, *cand
= NULL
;
123 struct ip6gre_net
*ign
= net_generic(net
, ip6gre_net_id
);
124 int dev_type
= (gre_proto
== htons(ETH_P_TEB
)) ?
125 ARPHRD_ETHER
: ARPHRD_IP6GRE
;
126 int score
, cand_score
= 4;
128 for_each_ip_tunnel_rcu(t
, ign
->tunnels_r_l
[h0
^ h1
]) {
129 if (!ipv6_addr_equal(local
, &t
->parms
.laddr
) ||
130 !ipv6_addr_equal(remote
, &t
->parms
.raddr
) ||
131 key
!= t
->parms
.i_key
||
132 !(t
->dev
->flags
& IFF_UP
))
135 if (t
->dev
->type
!= ARPHRD_IP6GRE
&&
136 t
->dev
->type
!= dev_type
)
140 if (t
->parms
.link
!= link
)
142 if (t
->dev
->type
!= dev_type
)
147 if (score
< cand_score
) {
153 for_each_ip_tunnel_rcu(t
, ign
->tunnels_r
[h0
^ h1
]) {
154 if (!ipv6_addr_equal(remote
, &t
->parms
.raddr
) ||
155 key
!= t
->parms
.i_key
||
156 !(t
->dev
->flags
& IFF_UP
))
159 if (t
->dev
->type
!= ARPHRD_IP6GRE
&&
160 t
->dev
->type
!= dev_type
)
164 if (t
->parms
.link
!= link
)
166 if (t
->dev
->type
!= dev_type
)
171 if (score
< cand_score
) {
177 for_each_ip_tunnel_rcu(t
, ign
->tunnels_l
[h1
]) {
178 if ((!ipv6_addr_equal(local
, &t
->parms
.laddr
) &&
179 (!ipv6_addr_equal(local
, &t
->parms
.raddr
) ||
180 !ipv6_addr_is_multicast(local
))) ||
181 key
!= t
->parms
.i_key
||
182 !(t
->dev
->flags
& IFF_UP
))
185 if (t
->dev
->type
!= ARPHRD_IP6GRE
&&
186 t
->dev
->type
!= dev_type
)
190 if (t
->parms
.link
!= link
)
192 if (t
->dev
->type
!= dev_type
)
197 if (score
< cand_score
) {
203 for_each_ip_tunnel_rcu(t
, ign
->tunnels_wc
[h1
]) {
204 if (t
->parms
.i_key
!= key
||
205 !(t
->dev
->flags
& IFF_UP
))
208 if (t
->dev
->type
!= ARPHRD_IP6GRE
&&
209 t
->dev
->type
!= dev_type
)
213 if (t
->parms
.link
!= link
)
215 if (t
->dev
->type
!= dev_type
)
220 if (score
< cand_score
) {
229 dev
= ign
->fb_tunnel_dev
;
230 if (dev
->flags
& IFF_UP
)
231 return netdev_priv(dev
);
236 static struct ip6_tnl __rcu
**__ip6gre_bucket(struct ip6gre_net
*ign
,
237 const struct __ip6_tnl_parm
*p
)
239 const struct in6_addr
*remote
= &p
->raddr
;
240 const struct in6_addr
*local
= &p
->laddr
;
241 unsigned int h
= HASH_KEY(p
->i_key
);
244 if (!ipv6_addr_any(local
))
246 if (!ipv6_addr_any(remote
) && !ipv6_addr_is_multicast(remote
)) {
248 h
^= HASH_ADDR(remote
);
251 return &ign
->tunnels
[prio
][h
];
254 static inline struct ip6_tnl __rcu
**ip6gre_bucket(struct ip6gre_net
*ign
,
255 const struct ip6_tnl
*t
)
257 return __ip6gre_bucket(ign
, &t
->parms
);
260 static void ip6gre_tunnel_link(struct ip6gre_net
*ign
, struct ip6_tnl
*t
)
262 struct ip6_tnl __rcu
**tp
= ip6gre_bucket(ign
, t
);
264 rcu_assign_pointer(t
->next
, rtnl_dereference(*tp
));
265 rcu_assign_pointer(*tp
, t
);
268 static void ip6gre_tunnel_unlink(struct ip6gre_net
*ign
, struct ip6_tnl
*t
)
270 struct ip6_tnl __rcu
**tp
;
271 struct ip6_tnl
*iter
;
273 for (tp
= ip6gre_bucket(ign
, t
);
274 (iter
= rtnl_dereference(*tp
)) != NULL
;
277 rcu_assign_pointer(*tp
, t
->next
);
283 static struct ip6_tnl
*ip6gre_tunnel_find(struct net
*net
,
284 const struct __ip6_tnl_parm
*parms
,
287 const struct in6_addr
*remote
= &parms
->raddr
;
288 const struct in6_addr
*local
= &parms
->laddr
;
289 __be32 key
= parms
->i_key
;
290 int link
= parms
->link
;
292 struct ip6_tnl __rcu
**tp
;
293 struct ip6gre_net
*ign
= net_generic(net
, ip6gre_net_id
);
295 for (tp
= __ip6gre_bucket(ign
, parms
);
296 (t
= rtnl_dereference(*tp
)) != NULL
;
298 if (ipv6_addr_equal(local
, &t
->parms
.laddr
) &&
299 ipv6_addr_equal(remote
, &t
->parms
.raddr
) &&
300 key
== t
->parms
.i_key
&&
301 link
== t
->parms
.link
&&
302 type
== t
->dev
->type
)
308 static struct ip6_tnl
*ip6gre_tunnel_locate(struct net
*net
,
309 const struct __ip6_tnl_parm
*parms
, int create
)
311 struct ip6_tnl
*t
, *nt
;
312 struct net_device
*dev
;
314 struct ip6gre_net
*ign
= net_generic(net
, ip6gre_net_id
);
316 t
= ip6gre_tunnel_find(net
, parms
, ARPHRD_IP6GRE
);
321 strlcpy(name
, parms
->name
, IFNAMSIZ
);
323 strcpy(name
, "ip6gre%d");
325 dev
= alloc_netdev(sizeof(*t
), name
, ip6gre_tunnel_setup
);
329 dev_net_set(dev
, net
);
331 nt
= netdev_priv(dev
);
333 dev
->rtnl_link_ops
= &ip6gre_link_ops
;
336 nt
->net
= dev_net(dev
);
337 ip6gre_tnl_link_config(nt
, 1);
339 if (register_netdevice(dev
) < 0)
342 /* Can use a lockless transmit, unless we generate output sequences */
343 if (!(nt
->parms
.o_flags
& GRE_SEQ
))
344 dev
->features
|= NETIF_F_LLTX
;
347 ip6gre_tunnel_link(ign
, nt
);
355 static void ip6gre_tunnel_uninit(struct net_device
*dev
)
357 struct ip6_tnl
*t
= netdev_priv(dev
);
358 struct ip6gre_net
*ign
= net_generic(t
->net
, ip6gre_net_id
);
360 ip6gre_tunnel_unlink(ign
, t
);
365 static void ip6gre_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
366 u8 type
, u8 code
, int offset
, __be32 info
)
368 const struct ipv6hdr
*ipv6h
= (const struct ipv6hdr
*)skb
->data
;
369 __be16
*p
= (__be16
*)(skb
->data
+ offset
);
370 int grehlen
= offset
+ 4;
375 if (flags
&(GRE_CSUM
|GRE_KEY
|GRE_SEQ
|GRE_ROUTING
|GRE_VERSION
)) {
376 if (flags
&(GRE_VERSION
|GRE_ROUTING
))
385 /* If only 8 bytes returned, keyed message will be dropped here */
386 if (!pskb_may_pull(skb
, grehlen
))
388 ipv6h
= (const struct ipv6hdr
*)skb
->data
;
389 p
= (__be16
*)(skb
->data
+ offset
);
391 t
= ip6gre_tunnel_lookup(skb
->dev
, &ipv6h
->daddr
, &ipv6h
->saddr
,
393 *(((__be32
*)p
) + (grehlen
/ 4) - 1) : 0,
400 struct ipv6_tlv_tnl_enc_lim
*tel
;
402 case ICMPV6_DEST_UNREACH
:
403 net_warn_ratelimited("%s: Path to destination invalid or inactive!\n",
406 case ICMPV6_TIME_EXCEED
:
407 if (code
== ICMPV6_EXC_HOPLIMIT
) {
408 net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
412 case ICMPV6_PARAMPROB
:
414 if (code
== ICMPV6_HDR_FIELD
)
415 teli
= ip6_tnl_parse_tlv_enc_lim(skb
, skb
->data
);
417 if (teli
&& teli
== info
- 2) {
418 tel
= (struct ipv6_tlv_tnl_enc_lim
*) &skb
->data
[teli
];
419 if (tel
->encap_limit
== 0) {
420 net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
424 net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
428 case ICMPV6_PKT_TOOBIG
:
430 if (mtu
< IPV6_MIN_MTU
)
436 if (time_before(jiffies
, t
->err_time
+ IP6TUNNEL_ERR_TIMEO
))
440 t
->err_time
= jiffies
;
443 static int ip6gre_rcv(struct sk_buff
*skb
)
445 const struct ipv6hdr
*ipv6h
;
451 struct ip6_tnl
*tunnel
;
456 if (!pskb_may_pull(skb
, sizeof(struct in6_addr
)))
459 ipv6h
= ipv6_hdr(skb
);
461 flags
= *(__be16
*)h
;
463 if (flags
&(GRE_CSUM
|GRE_KEY
|GRE_ROUTING
|GRE_SEQ
|GRE_VERSION
)) {
464 /* - Version must be 0.
465 - We do not support routing headers.
467 if (flags
&(GRE_VERSION
|GRE_ROUTING
))
470 if (flags
&GRE_CSUM
) {
471 csum
= skb_checksum_simple_validate(skb
);
475 key
= *(__be32
*)(h
+ offset
);
479 seqno
= ntohl(*(__be32
*)(h
+ offset
));
484 gre_proto
= *(__be16
*)(h
+ 2);
486 tunnel
= ip6gre_tunnel_lookup(skb
->dev
,
487 &ipv6h
->saddr
, &ipv6h
->daddr
, key
,
490 struct pcpu_sw_netstats
*tstats
;
492 if (!xfrm6_policy_check(NULL
, XFRM_POLICY_IN
, skb
))
495 if (!ip6_tnl_rcv_ctl(tunnel
, &ipv6h
->daddr
, &ipv6h
->saddr
)) {
496 tunnel
->dev
->stats
.rx_dropped
++;
500 skb
->protocol
= gre_proto
;
501 /* WCCP version 1 and 2 protocol decoding.
502 * - Change protocol to IP
503 * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header
505 if (flags
== 0 && gre_proto
== htons(ETH_P_WCCP
)) {
506 skb
->protocol
= htons(ETH_P_IP
);
507 if ((*(h
+ offset
) & 0xF0) != 0x40)
511 skb
->mac_header
= skb
->network_header
;
512 __pskb_pull(skb
, offset
);
513 skb_postpull_rcsum(skb
, skb_transport_header(skb
), offset
);
515 if (((flags
&GRE_CSUM
) && csum
) ||
516 (!(flags
&GRE_CSUM
) && tunnel
->parms
.i_flags
&GRE_CSUM
)) {
517 tunnel
->dev
->stats
.rx_crc_errors
++;
518 tunnel
->dev
->stats
.rx_errors
++;
521 if (tunnel
->parms
.i_flags
&GRE_SEQ
) {
522 if (!(flags
&GRE_SEQ
) ||
524 (s32
)(seqno
- tunnel
->i_seqno
) < 0)) {
525 tunnel
->dev
->stats
.rx_fifo_errors
++;
526 tunnel
->dev
->stats
.rx_errors
++;
529 tunnel
->i_seqno
= seqno
+ 1;
532 /* Warning: All skb pointers will be invalidated! */
533 if (tunnel
->dev
->type
== ARPHRD_ETHER
) {
534 if (!pskb_may_pull(skb
, ETH_HLEN
)) {
535 tunnel
->dev
->stats
.rx_length_errors
++;
536 tunnel
->dev
->stats
.rx_errors
++;
540 ipv6h
= ipv6_hdr(skb
);
541 skb
->protocol
= eth_type_trans(skb
, tunnel
->dev
);
542 skb_postpull_rcsum(skb
, eth_hdr(skb
), ETH_HLEN
);
545 __skb_tunnel_rx(skb
, tunnel
->dev
, tunnel
->net
);
547 skb_reset_network_header(skb
);
549 err
= IP6_ECN_decapsulate(ipv6h
, skb
);
552 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
554 ipv6_get_dsfield(ipv6h
));
556 ++tunnel
->dev
->stats
.rx_frame_errors
;
557 ++tunnel
->dev
->stats
.rx_errors
;
562 tstats
= this_cpu_ptr(tunnel
->dev
->tstats
);
563 u64_stats_update_begin(&tstats
->syncp
);
564 tstats
->rx_packets
++;
565 tstats
->rx_bytes
+= skb
->len
;
566 u64_stats_update_end(&tstats
->syncp
);
572 icmpv6_send(skb
, ICMPV6_DEST_UNREACH
, ICMPV6_PORT_UNREACH
, 0);
579 struct ipv6_tel_txoption
{
580 struct ipv6_txoptions ops
;
584 static void init_tel_txopt(struct ipv6_tel_txoption
*opt
, __u8 encap_limit
)
586 memset(opt
, 0, sizeof(struct ipv6_tel_txoption
));
588 opt
->dst_opt
[2] = IPV6_TLV_TNL_ENCAP_LIMIT
;
590 opt
->dst_opt
[4] = encap_limit
;
591 opt
->dst_opt
[5] = IPV6_TLV_PADN
;
594 opt
->ops
.dst0opt
= (struct ipv6_opt_hdr
*) opt
->dst_opt
;
595 opt
->ops
.opt_nflen
= 8;
598 static netdev_tx_t
ip6gre_xmit2(struct sk_buff
*skb
,
599 struct net_device
*dev
,
605 struct ip6_tnl
*tunnel
= netdev_priv(dev
);
606 struct net
*net
= tunnel
->net
;
607 struct net_device
*tdev
; /* Device to other host */
608 struct ipv6hdr
*ipv6h
; /* Our new IP header */
609 unsigned int max_headroom
= 0; /* The extra header space needed */
611 struct ipv6_tel_txoption opt
;
613 struct dst_entry
*dst
= NULL
, *ndst
= NULL
;
614 struct net_device_stats
*stats
= &tunnel
->dev
->stats
;
617 struct sk_buff
*new_skb
;
619 if (dev
->type
== ARPHRD_ETHER
)
620 IPCB(skb
)->flags
= 0;
622 if (dev
->header_ops
&& dev
->type
== ARPHRD_IP6GRE
) {
624 ipv6h
= (struct ipv6hdr
*)skb
->data
;
625 fl6
->daddr
= ipv6h
->daddr
;
627 gre_hlen
= tunnel
->hlen
;
628 fl6
->daddr
= tunnel
->parms
.raddr
;
631 if (!fl6
->flowi6_mark
)
632 dst
= ip6_tnl_dst_check(tunnel
);
635 ndst
= ip6_route_output(net
, NULL
, fl6
);
638 goto tx_err_link_failure
;
639 ndst
= xfrm_lookup(net
, ndst
, flowi6_to_flowi(fl6
), NULL
, 0);
643 goto tx_err_link_failure
;
652 net_warn_ratelimited("%s: Local routing loop detected!\n",
654 goto tx_err_dst_release
;
657 mtu
= dst_mtu(dst
) - sizeof(*ipv6h
);
658 if (encap_limit
>= 0) {
662 if (mtu
< IPV6_MIN_MTU
)
665 skb_dst(skb
)->ops
->update_pmtu(skb_dst(skb
), NULL
, skb
, mtu
);
666 if (skb
->len
> mtu
) {
669 goto tx_err_dst_release
;
672 if (tunnel
->err_count
> 0) {
673 if (time_before(jiffies
,
674 tunnel
->err_time
+ IP6TUNNEL_ERR_TIMEO
)) {
677 dst_link_failure(skb
);
679 tunnel
->err_count
= 0;
682 skb_scrub_packet(skb
, !net_eq(tunnel
->net
, dev_net(dev
)));
684 max_headroom
+= LL_RESERVED_SPACE(tdev
) + gre_hlen
+ dst
->header_len
;
686 if (skb_headroom(skb
) < max_headroom
|| skb_shared(skb
) ||
687 (skb_cloned(skb
) && !skb_clone_writable(skb
, 0))) {
688 new_skb
= skb_realloc_headroom(skb
, max_headroom
);
689 if (max_headroom
> dev
->needed_headroom
)
690 dev
->needed_headroom
= max_headroom
;
692 goto tx_err_dst_release
;
695 skb_set_owner_w(new_skb
, skb
->sk
);
700 if (fl6
->flowi6_mark
) {
701 skb_dst_set(skb
, dst
);
704 skb_dst_set_noref(skb
, dst
);
708 if (encap_limit
>= 0) {
709 init_tel_txopt(&opt
, encap_limit
);
710 ipv6_push_nfrag_opts(skb
, &opt
.ops
, &proto
, NULL
);
713 if (likely(!skb
->encapsulation
)) {
714 skb_reset_inner_headers(skb
);
715 skb
->encapsulation
= 1;
718 skb_push(skb
, gre_hlen
);
719 skb_reset_network_header(skb
);
720 skb_set_transport_header(skb
, sizeof(*ipv6h
));
723 * Push down and install the IP header.
725 ipv6h
= ipv6_hdr(skb
);
726 ip6_flow_hdr(ipv6h
, INET_ECN_encapsulate(0, dsfield
), fl6
->flowlabel
);
727 ipv6h
->hop_limit
= tunnel
->parms
.hop_limit
;
728 ipv6h
->nexthdr
= proto
;
729 ipv6h
->saddr
= fl6
->saddr
;
730 ipv6h
->daddr
= fl6
->daddr
;
732 ((__be16
*)(ipv6h
+ 1))[0] = tunnel
->parms
.o_flags
;
733 ((__be16
*)(ipv6h
+ 1))[1] = (dev
->type
== ARPHRD_ETHER
) ?
734 htons(ETH_P_TEB
) : skb
->protocol
;
736 if (tunnel
->parms
.o_flags
&(GRE_KEY
|GRE_CSUM
|GRE_SEQ
)) {
737 __be32
*ptr
= (__be32
*)(((u8
*)ipv6h
) + tunnel
->hlen
- 4);
739 if (tunnel
->parms
.o_flags
&GRE_SEQ
) {
741 *ptr
= htonl(tunnel
->o_seqno
);
744 if (tunnel
->parms
.o_flags
&GRE_KEY
) {
745 *ptr
= tunnel
->parms
.o_key
;
748 if (tunnel
->parms
.o_flags
&GRE_CSUM
) {
750 *(__sum16
*)ptr
= ip_compute_csum((void *)(ipv6h
+1),
751 skb
->len
- sizeof(struct ipv6hdr
));
755 ip6tunnel_xmit(skb
, dev
);
757 ip6_tnl_dst_store(tunnel
, ndst
);
760 stats
->tx_carrier_errors
++;
761 dst_link_failure(skb
);
767 static inline int ip6gre_xmit_ipv4(struct sk_buff
*skb
, struct net_device
*dev
)
769 struct ip6_tnl
*t
= netdev_priv(dev
);
770 const struct iphdr
*iph
= ip_hdr(skb
);
771 int encap_limit
= -1;
777 if (!(t
->parms
.flags
& IP6_TNL_F_IGN_ENCAP_LIMIT
))
778 encap_limit
= t
->parms
.encap_limit
;
780 memcpy(&fl6
, &t
->fl
.u
.ip6
, sizeof(fl6
));
781 fl6
.flowi6_proto
= IPPROTO_IPIP
;
783 dsfield
= ipv4_get_dsfield(iph
);
785 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_TCLASS
)
786 fl6
.flowlabel
|= htonl((__u32
)iph
->tos
<< IPV6_TCLASS_SHIFT
)
788 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_FWMARK
)
789 fl6
.flowi6_mark
= skb
->mark
;
791 err
= ip6gre_xmit2(skb
, dev
, dsfield
, &fl6
, encap_limit
, &mtu
);
793 /* XXX: send ICMP error even if DF is not set. */
794 if (err
== -EMSGSIZE
)
795 icmp_send(skb
, ICMP_DEST_UNREACH
, ICMP_FRAG_NEEDED
,
803 static inline int ip6gre_xmit_ipv6(struct sk_buff
*skb
, struct net_device
*dev
)
805 struct ip6_tnl
*t
= netdev_priv(dev
);
806 struct ipv6hdr
*ipv6h
= ipv6_hdr(skb
);
807 int encap_limit
= -1;
814 if (ipv6_addr_equal(&t
->parms
.raddr
, &ipv6h
->saddr
))
817 offset
= ip6_tnl_parse_tlv_enc_lim(skb
, skb_network_header(skb
));
819 struct ipv6_tlv_tnl_enc_lim
*tel
;
820 tel
= (struct ipv6_tlv_tnl_enc_lim
*)&skb_network_header(skb
)[offset
];
821 if (tel
->encap_limit
== 0) {
822 icmpv6_send(skb
, ICMPV6_PARAMPROB
,
823 ICMPV6_HDR_FIELD
, offset
+ 2);
826 encap_limit
= tel
->encap_limit
- 1;
827 } else if (!(t
->parms
.flags
& IP6_TNL_F_IGN_ENCAP_LIMIT
))
828 encap_limit
= t
->parms
.encap_limit
;
830 memcpy(&fl6
, &t
->fl
.u
.ip6
, sizeof(fl6
));
831 fl6
.flowi6_proto
= IPPROTO_IPV6
;
833 dsfield
= ipv6_get_dsfield(ipv6h
);
834 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_TCLASS
)
835 fl6
.flowlabel
|= (*(__be32
*) ipv6h
& IPV6_TCLASS_MASK
);
836 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_FLOWLABEL
)
837 fl6
.flowlabel
|= ip6_flowlabel(ipv6h
);
838 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_FWMARK
)
839 fl6
.flowi6_mark
= skb
->mark
;
841 err
= ip6gre_xmit2(skb
, dev
, dsfield
, &fl6
, encap_limit
, &mtu
);
843 if (err
== -EMSGSIZE
)
844 icmpv6_send(skb
, ICMPV6_PKT_TOOBIG
, 0, mtu
);
852 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
853 * @t: the outgoing tunnel device
854 * @hdr: IPv6 header from the incoming packet
857 * Avoid trivial tunneling loop by checking that tunnel exit-point
858 * doesn't match source of incoming packet.
865 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl
*t
,
866 const struct ipv6hdr
*hdr
)
868 return ipv6_addr_equal(&t
->parms
.raddr
, &hdr
->saddr
);
871 static int ip6gre_xmit_other(struct sk_buff
*skb
, struct net_device
*dev
)
873 struct ip6_tnl
*t
= netdev_priv(dev
);
874 int encap_limit
= -1;
879 if (!(t
->parms
.flags
& IP6_TNL_F_IGN_ENCAP_LIMIT
))
880 encap_limit
= t
->parms
.encap_limit
;
882 memcpy(&fl6
, &t
->fl
.u
.ip6
, sizeof(fl6
));
883 fl6
.flowi6_proto
= skb
->protocol
;
885 err
= ip6gre_xmit2(skb
, dev
, 0, &fl6
, encap_limit
, &mtu
);
890 static netdev_tx_t
ip6gre_tunnel_xmit(struct sk_buff
*skb
,
891 struct net_device
*dev
)
893 struct ip6_tnl
*t
= netdev_priv(dev
);
894 struct net_device_stats
*stats
= &t
->dev
->stats
;
897 if (!ip6_tnl_xmit_ctl(t
))
900 switch (skb
->protocol
) {
901 case htons(ETH_P_IP
):
902 ret
= ip6gre_xmit_ipv4(skb
, dev
);
904 case htons(ETH_P_IPV6
):
905 ret
= ip6gre_xmit_ipv6(skb
, dev
);
908 ret
= ip6gre_xmit_other(skb
, dev
);
924 static void ip6gre_tnl_link_config(struct ip6_tnl
*t
, int set_mtu
)
926 struct net_device
*dev
= t
->dev
;
927 struct __ip6_tnl_parm
*p
= &t
->parms
;
928 struct flowi6
*fl6
= &t
->fl
.u
.ip6
;
929 int addend
= sizeof(struct ipv6hdr
) + 4;
931 if (dev
->type
!= ARPHRD_ETHER
) {
932 memcpy(dev
->dev_addr
, &p
->laddr
, sizeof(struct in6_addr
));
933 memcpy(dev
->broadcast
, &p
->raddr
, sizeof(struct in6_addr
));
936 /* Set up flowi template */
937 fl6
->saddr
= p
->laddr
;
938 fl6
->daddr
= p
->raddr
;
939 fl6
->flowi6_oif
= p
->link
;
942 if (!(p
->flags
&IP6_TNL_F_USE_ORIG_TCLASS
))
943 fl6
->flowlabel
|= IPV6_TCLASS_MASK
& p
->flowinfo
;
944 if (!(p
->flags
&IP6_TNL_F_USE_ORIG_FLOWLABEL
))
945 fl6
->flowlabel
|= IPV6_FLOWLABEL_MASK
& p
->flowinfo
;
947 p
->flags
&= ~(IP6_TNL_F_CAP_XMIT
|IP6_TNL_F_CAP_RCV
|IP6_TNL_F_CAP_PER_PACKET
);
948 p
->flags
|= ip6_tnl_get_cap(t
, &p
->laddr
, &p
->raddr
);
950 if (p
->flags
&IP6_TNL_F_CAP_XMIT
&&
951 p
->flags
&IP6_TNL_F_CAP_RCV
&& dev
->type
!= ARPHRD_ETHER
)
952 dev
->flags
|= IFF_POINTOPOINT
;
954 dev
->flags
&= ~IFF_POINTOPOINT
;
956 dev
->iflink
= p
->link
;
958 /* Precalculate GRE options length */
959 if (t
->parms
.o_flags
&(GRE_CSUM
|GRE_KEY
|GRE_SEQ
)) {
960 if (t
->parms
.o_flags
&GRE_CSUM
)
962 if (t
->parms
.o_flags
&GRE_KEY
)
964 if (t
->parms
.o_flags
&GRE_SEQ
)
969 if (p
->flags
& IP6_TNL_F_CAP_XMIT
) {
970 int strict
= (ipv6_addr_type(&p
->raddr
) &
971 (IPV6_ADDR_MULTICAST
|IPV6_ADDR_LINKLOCAL
));
973 struct rt6_info
*rt
= rt6_lookup(t
->net
,
974 &p
->raddr
, &p
->laddr
,
981 dev
->hard_header_len
= rt
->dst
.dev
->hard_header_len
+ addend
;
984 dev
->mtu
= rt
->dst
.dev
->mtu
- addend
;
985 if (!(t
->parms
.flags
& IP6_TNL_F_IGN_ENCAP_LIMIT
))
988 if (dev
->mtu
< IPV6_MIN_MTU
)
989 dev
->mtu
= IPV6_MIN_MTU
;
996 static int ip6gre_tnl_change(struct ip6_tnl
*t
,
997 const struct __ip6_tnl_parm
*p
, int set_mtu
)
999 t
->parms
.laddr
= p
->laddr
;
1000 t
->parms
.raddr
= p
->raddr
;
1001 t
->parms
.flags
= p
->flags
;
1002 t
->parms
.hop_limit
= p
->hop_limit
;
1003 t
->parms
.encap_limit
= p
->encap_limit
;
1004 t
->parms
.flowinfo
= p
->flowinfo
;
1005 t
->parms
.link
= p
->link
;
1006 t
->parms
.proto
= p
->proto
;
1007 t
->parms
.i_key
= p
->i_key
;
1008 t
->parms
.o_key
= p
->o_key
;
1009 t
->parms
.i_flags
= p
->i_flags
;
1010 t
->parms
.o_flags
= p
->o_flags
;
1011 ip6_tnl_dst_reset(t
);
1012 ip6gre_tnl_link_config(t
, set_mtu
);
1016 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm
*p
,
1017 const struct ip6_tnl_parm2
*u
)
1019 p
->laddr
= u
->laddr
;
1020 p
->raddr
= u
->raddr
;
1021 p
->flags
= u
->flags
;
1022 p
->hop_limit
= u
->hop_limit
;
1023 p
->encap_limit
= u
->encap_limit
;
1024 p
->flowinfo
= u
->flowinfo
;
1026 p
->i_key
= u
->i_key
;
1027 p
->o_key
= u
->o_key
;
1028 p
->i_flags
= u
->i_flags
;
1029 p
->o_flags
= u
->o_flags
;
1030 memcpy(p
->name
, u
->name
, sizeof(u
->name
));
1033 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2
*u
,
1034 const struct __ip6_tnl_parm
*p
)
1036 u
->proto
= IPPROTO_GRE
;
1037 u
->laddr
= p
->laddr
;
1038 u
->raddr
= p
->raddr
;
1039 u
->flags
= p
->flags
;
1040 u
->hop_limit
= p
->hop_limit
;
1041 u
->encap_limit
= p
->encap_limit
;
1042 u
->flowinfo
= p
->flowinfo
;
1044 u
->i_key
= p
->i_key
;
1045 u
->o_key
= p
->o_key
;
1046 u
->i_flags
= p
->i_flags
;
1047 u
->o_flags
= p
->o_flags
;
1048 memcpy(u
->name
, p
->name
, sizeof(u
->name
));
1051 static int ip6gre_tunnel_ioctl(struct net_device
*dev
,
1052 struct ifreq
*ifr
, int cmd
)
1055 struct ip6_tnl_parm2 p
;
1056 struct __ip6_tnl_parm p1
;
1057 struct ip6_tnl
*t
= netdev_priv(dev
);
1058 struct net
*net
= t
->net
;
1059 struct ip6gre_net
*ign
= net_generic(net
, ip6gre_net_id
);
1063 if (dev
== ign
->fb_tunnel_dev
) {
1064 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
))) {
1068 ip6gre_tnl_parm_from_user(&p1
, &p
);
1069 t
= ip6gre_tunnel_locate(net
, &p1
, 0);
1071 t
= netdev_priv(dev
);
1073 memset(&p
, 0, sizeof(p
));
1074 ip6gre_tnl_parm_to_user(&p
, &t
->parms
);
1075 if (copy_to_user(ifr
->ifr_ifru
.ifru_data
, &p
, sizeof(p
)))
1082 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
1086 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
)))
1090 if ((p
.i_flags
|p
.o_flags
)&(GRE_VERSION
|GRE_ROUTING
))
1093 if (!(p
.i_flags
&GRE_KEY
))
1095 if (!(p
.o_flags
&GRE_KEY
))
1098 ip6gre_tnl_parm_from_user(&p1
, &p
);
1099 t
= ip6gre_tunnel_locate(net
, &p1
, cmd
== SIOCADDTUNNEL
);
1101 if (dev
!= ign
->fb_tunnel_dev
&& cmd
== SIOCCHGTUNNEL
) {
1103 if (t
->dev
!= dev
) {
1108 t
= netdev_priv(dev
);
1110 ip6gre_tunnel_unlink(ign
, t
);
1112 ip6gre_tnl_change(t
, &p1
, 1);
1113 ip6gre_tunnel_link(ign
, t
);
1114 netdev_state_change(dev
);
1121 memset(&p
, 0, sizeof(p
));
1122 ip6gre_tnl_parm_to_user(&p
, &t
->parms
);
1123 if (copy_to_user(ifr
->ifr_ifru
.ifru_data
, &p
, sizeof(p
)))
1126 err
= (cmd
== SIOCADDTUNNEL
? -ENOBUFS
: -ENOENT
);
1131 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
1134 if (dev
== ign
->fb_tunnel_dev
) {
1136 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
)))
1139 ip6gre_tnl_parm_from_user(&p1
, &p
);
1140 t
= ip6gre_tunnel_locate(net
, &p1
, 0);
1144 if (t
== netdev_priv(ign
->fb_tunnel_dev
))
1148 unregister_netdevice(dev
);
1160 static int ip6gre_tunnel_change_mtu(struct net_device
*dev
, int new_mtu
)
1163 new_mtu
> 0xFFF8 - dev
->hard_header_len
)
1169 static int ip6gre_header(struct sk_buff
*skb
, struct net_device
*dev
,
1170 unsigned short type
,
1171 const void *daddr
, const void *saddr
, unsigned int len
)
1173 struct ip6_tnl
*t
= netdev_priv(dev
);
1174 struct ipv6hdr
*ipv6h
= (struct ipv6hdr
*)skb_push(skb
, t
->hlen
);
1175 __be16
*p
= (__be16
*)(ipv6h
+1);
1177 ip6_flow_hdr(ipv6h
, 0, t
->fl
.u
.ip6
.flowlabel
);
1178 ipv6h
->hop_limit
= t
->parms
.hop_limit
;
1179 ipv6h
->nexthdr
= NEXTHDR_GRE
;
1180 ipv6h
->saddr
= t
->parms
.laddr
;
1181 ipv6h
->daddr
= t
->parms
.raddr
;
1183 p
[0] = t
->parms
.o_flags
;
1187 * Set the source hardware address.
1191 memcpy(&ipv6h
->saddr
, saddr
, sizeof(struct in6_addr
));
1193 memcpy(&ipv6h
->daddr
, daddr
, sizeof(struct in6_addr
));
1194 if (!ipv6_addr_any(&ipv6h
->daddr
))
1200 static const struct header_ops ip6gre_header_ops
= {
1201 .create
= ip6gre_header
,
1204 static const struct net_device_ops ip6gre_netdev_ops
= {
1205 .ndo_init
= ip6gre_tunnel_init
,
1206 .ndo_uninit
= ip6gre_tunnel_uninit
,
1207 .ndo_start_xmit
= ip6gre_tunnel_xmit
,
1208 .ndo_do_ioctl
= ip6gre_tunnel_ioctl
,
1209 .ndo_change_mtu
= ip6gre_tunnel_change_mtu
,
1210 .ndo_get_stats64
= ip_tunnel_get_stats64
,
1213 static void ip6gre_dev_free(struct net_device
*dev
)
1215 free_percpu(dev
->tstats
);
1219 static void ip6gre_tunnel_setup(struct net_device
*dev
)
1223 dev
->netdev_ops
= &ip6gre_netdev_ops
;
1224 dev
->destructor
= ip6gre_dev_free
;
1226 dev
->type
= ARPHRD_IP6GRE
;
1227 dev
->hard_header_len
= LL_MAX_HEADER
+ sizeof(struct ipv6hdr
) + 4;
1228 dev
->mtu
= ETH_DATA_LEN
- sizeof(struct ipv6hdr
) - 4;
1229 t
= netdev_priv(dev
);
1230 if (!(t
->parms
.flags
& IP6_TNL_F_IGN_ENCAP_LIMIT
))
1232 dev
->flags
|= IFF_NOARP
;
1234 dev
->addr_len
= sizeof(struct in6_addr
);
1235 dev
->priv_flags
&= ~IFF_XMIT_DST_RELEASE
;
1238 static int ip6gre_tunnel_init(struct net_device
*dev
)
1240 struct ip6_tnl
*tunnel
;
1243 tunnel
= netdev_priv(dev
);
1246 tunnel
->net
= dev_net(dev
);
1247 strcpy(tunnel
->parms
.name
, dev
->name
);
1249 memcpy(dev
->dev_addr
, &tunnel
->parms
.laddr
, sizeof(struct in6_addr
));
1250 memcpy(dev
->broadcast
, &tunnel
->parms
.raddr
, sizeof(struct in6_addr
));
1252 if (ipv6_addr_any(&tunnel
->parms
.raddr
))
1253 dev
->header_ops
= &ip6gre_header_ops
;
1255 dev
->tstats
= alloc_percpu(struct pcpu_sw_netstats
);
1259 for_each_possible_cpu(i
) {
1260 struct pcpu_sw_netstats
*ip6gre_tunnel_stats
;
1261 ip6gre_tunnel_stats
= per_cpu_ptr(dev
->tstats
, i
);
1262 u64_stats_init(&ip6gre_tunnel_stats
->syncp
);
1269 static void ip6gre_fb_tunnel_init(struct net_device
*dev
)
1271 struct ip6_tnl
*tunnel
= netdev_priv(dev
);
1274 tunnel
->net
= dev_net(dev
);
1275 strcpy(tunnel
->parms
.name
, dev
->name
);
1277 tunnel
->hlen
= sizeof(struct ipv6hdr
) + 4;
1283 static struct inet6_protocol ip6gre_protocol __read_mostly
= {
1284 .handler
= ip6gre_rcv
,
1285 .err_handler
= ip6gre_err
,
1286 .flags
= INET6_PROTO_NOPOLICY
|INET6_PROTO_FINAL
,
1289 static void ip6gre_destroy_tunnels(struct net
*net
, struct list_head
*head
)
1291 struct ip6gre_net
*ign
= net_generic(net
, ip6gre_net_id
);
1292 struct net_device
*dev
, *aux
;
1295 for_each_netdev_safe(net
, dev
, aux
)
1296 if (dev
->rtnl_link_ops
== &ip6gre_link_ops
||
1297 dev
->rtnl_link_ops
== &ip6gre_tap_ops
)
1298 unregister_netdevice_queue(dev
, head
);
1300 for (prio
= 0; prio
< 4; prio
++) {
1302 for (h
= 0; h
< HASH_SIZE
; h
++) {
1305 t
= rtnl_dereference(ign
->tunnels
[prio
][h
]);
1308 /* If dev is in the same netns, it has already
1309 * been added to the list by the previous loop.
1311 if (!net_eq(dev_net(t
->dev
), net
))
1312 unregister_netdevice_queue(t
->dev
,
1314 t
= rtnl_dereference(t
->next
);
1320 static int __net_init
ip6gre_init_net(struct net
*net
)
1322 struct ip6gre_net
*ign
= net_generic(net
, ip6gre_net_id
);
1325 ign
->fb_tunnel_dev
= alloc_netdev(sizeof(struct ip6_tnl
), "ip6gre0",
1326 ip6gre_tunnel_setup
);
1327 if (!ign
->fb_tunnel_dev
) {
1331 dev_net_set(ign
->fb_tunnel_dev
, net
);
1332 /* FB netdevice is special: we have one, and only one per netns.
1333 * Allowing to move it to another netns is clearly unsafe.
1335 ign
->fb_tunnel_dev
->features
|= NETIF_F_NETNS_LOCAL
;
1338 ip6gre_fb_tunnel_init(ign
->fb_tunnel_dev
);
1339 ign
->fb_tunnel_dev
->rtnl_link_ops
= &ip6gre_link_ops
;
1341 err
= register_netdev(ign
->fb_tunnel_dev
);
1345 rcu_assign_pointer(ign
->tunnels_wc
[0],
1346 netdev_priv(ign
->fb_tunnel_dev
));
1350 ip6gre_dev_free(ign
->fb_tunnel_dev
);
1355 static void __net_exit
ip6gre_exit_net(struct net
*net
)
1360 ip6gre_destroy_tunnels(net
, &list
);
1361 unregister_netdevice_many(&list
);
1365 static struct pernet_operations ip6gre_net_ops
= {
1366 .init
= ip6gre_init_net
,
1367 .exit
= ip6gre_exit_net
,
1368 .id
= &ip6gre_net_id
,
1369 .size
= sizeof(struct ip6gre_net
),
1372 static int ip6gre_tunnel_validate(struct nlattr
*tb
[], struct nlattr
*data
[])
1380 if (data
[IFLA_GRE_IFLAGS
])
1381 flags
|= nla_get_be16(data
[IFLA_GRE_IFLAGS
]);
1382 if (data
[IFLA_GRE_OFLAGS
])
1383 flags
|= nla_get_be16(data
[IFLA_GRE_OFLAGS
]);
1384 if (flags
& (GRE_VERSION
|GRE_ROUTING
))
1390 static int ip6gre_tap_validate(struct nlattr
*tb
[], struct nlattr
*data
[])
1392 struct in6_addr daddr
;
1394 if (tb
[IFLA_ADDRESS
]) {
1395 if (nla_len(tb
[IFLA_ADDRESS
]) != ETH_ALEN
)
1397 if (!is_valid_ether_addr(nla_data(tb
[IFLA_ADDRESS
])))
1398 return -EADDRNOTAVAIL
;
1404 if (data
[IFLA_GRE_REMOTE
]) {
1405 nla_memcpy(&daddr
, data
[IFLA_GRE_REMOTE
], sizeof(struct in6_addr
));
1406 if (ipv6_addr_any(&daddr
))
1411 return ip6gre_tunnel_validate(tb
, data
);
1415 static void ip6gre_netlink_parms(struct nlattr
*data
[],
1416 struct __ip6_tnl_parm
*parms
)
1418 memset(parms
, 0, sizeof(*parms
));
1423 if (data
[IFLA_GRE_LINK
])
1424 parms
->link
= nla_get_u32(data
[IFLA_GRE_LINK
]);
1426 if (data
[IFLA_GRE_IFLAGS
])
1427 parms
->i_flags
= nla_get_be16(data
[IFLA_GRE_IFLAGS
]);
1429 if (data
[IFLA_GRE_OFLAGS
])
1430 parms
->o_flags
= nla_get_be16(data
[IFLA_GRE_OFLAGS
]);
1432 if (data
[IFLA_GRE_IKEY
])
1433 parms
->i_key
= nla_get_be32(data
[IFLA_GRE_IKEY
]);
1435 if (data
[IFLA_GRE_OKEY
])
1436 parms
->o_key
= nla_get_be32(data
[IFLA_GRE_OKEY
]);
1438 if (data
[IFLA_GRE_LOCAL
])
1439 nla_memcpy(&parms
->laddr
, data
[IFLA_GRE_LOCAL
], sizeof(struct in6_addr
));
1441 if (data
[IFLA_GRE_REMOTE
])
1442 nla_memcpy(&parms
->raddr
, data
[IFLA_GRE_REMOTE
], sizeof(struct in6_addr
));
1444 if (data
[IFLA_GRE_TTL
])
1445 parms
->hop_limit
= nla_get_u8(data
[IFLA_GRE_TTL
]);
1447 if (data
[IFLA_GRE_ENCAP_LIMIT
])
1448 parms
->encap_limit
= nla_get_u8(data
[IFLA_GRE_ENCAP_LIMIT
]);
1450 if (data
[IFLA_GRE_FLOWINFO
])
1451 parms
->flowinfo
= nla_get_u32(data
[IFLA_GRE_FLOWINFO
]);
1453 if (data
[IFLA_GRE_FLAGS
])
1454 parms
->flags
= nla_get_u32(data
[IFLA_GRE_FLAGS
]);
1457 static int ip6gre_tap_init(struct net_device
*dev
)
1459 struct ip6_tnl
*tunnel
;
1461 tunnel
= netdev_priv(dev
);
1464 tunnel
->net
= dev_net(dev
);
1465 strcpy(tunnel
->parms
.name
, dev
->name
);
1467 ip6gre_tnl_link_config(tunnel
, 1);
1469 dev
->tstats
= netdev_alloc_pcpu_stats(struct pcpu_sw_netstats
);
1476 static const struct net_device_ops ip6gre_tap_netdev_ops
= {
1477 .ndo_init
= ip6gre_tap_init
,
1478 .ndo_uninit
= ip6gre_tunnel_uninit
,
1479 .ndo_start_xmit
= ip6gre_tunnel_xmit
,
1480 .ndo_set_mac_address
= eth_mac_addr
,
1481 .ndo_validate_addr
= eth_validate_addr
,
1482 .ndo_change_mtu
= ip6gre_tunnel_change_mtu
,
1483 .ndo_get_stats64
= ip_tunnel_get_stats64
,
1486 static void ip6gre_tap_setup(struct net_device
*dev
)
1491 dev
->netdev_ops
= &ip6gre_tap_netdev_ops
;
1492 dev
->destructor
= ip6gre_dev_free
;
1495 dev
->features
|= NETIF_F_NETNS_LOCAL
;
1498 static int ip6gre_newlink(struct net
*src_net
, struct net_device
*dev
,
1499 struct nlattr
*tb
[], struct nlattr
*data
[])
1502 struct net
*net
= dev_net(dev
);
1503 struct ip6gre_net
*ign
= net_generic(net
, ip6gre_net_id
);
1506 nt
= netdev_priv(dev
);
1507 ip6gre_netlink_parms(data
, &nt
->parms
);
1509 if (ip6gre_tunnel_find(net
, &nt
->parms
, dev
->type
))
1512 if (dev
->type
== ARPHRD_ETHER
&& !tb
[IFLA_ADDRESS
])
1513 eth_hw_addr_random(dev
);
1516 nt
->net
= dev_net(dev
);
1517 ip6gre_tnl_link_config(nt
, !tb
[IFLA_MTU
]);
1519 /* Can use a lockless transmit, unless we generate output sequences */
1520 if (!(nt
->parms
.o_flags
& GRE_SEQ
))
1521 dev
->features
|= NETIF_F_LLTX
;
1523 err
= register_netdevice(dev
);
1528 ip6gre_tunnel_link(ign
, nt
);
1534 static int ip6gre_changelink(struct net_device
*dev
, struct nlattr
*tb
[],
1535 struct nlattr
*data
[])
1537 struct ip6_tnl
*t
, *nt
= netdev_priv(dev
);
1538 struct net
*net
= nt
->net
;
1539 struct ip6gre_net
*ign
= net_generic(net
, ip6gre_net_id
);
1540 struct __ip6_tnl_parm p
;
1542 if (dev
== ign
->fb_tunnel_dev
)
1545 ip6gre_netlink_parms(data
, &p
);
1547 t
= ip6gre_tunnel_locate(net
, &p
, 0);
1555 ip6gre_tunnel_unlink(ign
, t
);
1556 ip6gre_tnl_change(t
, &p
, !tb
[IFLA_MTU
]);
1557 ip6gre_tunnel_link(ign
, t
);
1558 netdev_state_change(dev
);
1564 static void ip6gre_dellink(struct net_device
*dev
, struct list_head
*head
)
1566 struct net
*net
= dev_net(dev
);
1567 struct ip6gre_net
*ign
= net_generic(net
, ip6gre_net_id
);
1569 if (dev
!= ign
->fb_tunnel_dev
)
1570 unregister_netdevice_queue(dev
, head
);
1573 static size_t ip6gre_get_size(const struct net_device
*dev
)
1578 /* IFLA_GRE_IFLAGS */
1580 /* IFLA_GRE_OFLAGS */
1586 /* IFLA_GRE_LOCAL */
1587 nla_total_size(sizeof(struct in6_addr
)) +
1588 /* IFLA_GRE_REMOTE */
1589 nla_total_size(sizeof(struct in6_addr
)) +
1594 /* IFLA_GRE_ENCAP_LIMIT */
1596 /* IFLA_GRE_FLOWINFO */
1598 /* IFLA_GRE_FLAGS */
1603 static int ip6gre_fill_info(struct sk_buff
*skb
, const struct net_device
*dev
)
1605 struct ip6_tnl
*t
= netdev_priv(dev
);
1606 struct __ip6_tnl_parm
*p
= &t
->parms
;
1608 if (nla_put_u32(skb
, IFLA_GRE_LINK
, p
->link
) ||
1609 nla_put_be16(skb
, IFLA_GRE_IFLAGS
, p
->i_flags
) ||
1610 nla_put_be16(skb
, IFLA_GRE_OFLAGS
, p
->o_flags
) ||
1611 nla_put_be32(skb
, IFLA_GRE_IKEY
, p
->i_key
) ||
1612 nla_put_be32(skb
, IFLA_GRE_OKEY
, p
->o_key
) ||
1613 nla_put(skb
, IFLA_GRE_LOCAL
, sizeof(struct in6_addr
), &p
->laddr
) ||
1614 nla_put(skb
, IFLA_GRE_REMOTE
, sizeof(struct in6_addr
), &p
->raddr
) ||
1615 nla_put_u8(skb
, IFLA_GRE_TTL
, p
->hop_limit
) ||
1616 /*nla_put_u8(skb, IFLA_GRE_TOS, t->priority) ||*/
1617 nla_put_u8(skb
, IFLA_GRE_ENCAP_LIMIT
, p
->encap_limit
) ||
1618 nla_put_be32(skb
, IFLA_GRE_FLOWINFO
, p
->flowinfo
) ||
1619 nla_put_u32(skb
, IFLA_GRE_FLAGS
, p
->flags
))
1620 goto nla_put_failure
;
1627 static const struct nla_policy ip6gre_policy
[IFLA_GRE_MAX
+ 1] = {
1628 [IFLA_GRE_LINK
] = { .type
= NLA_U32
},
1629 [IFLA_GRE_IFLAGS
] = { .type
= NLA_U16
},
1630 [IFLA_GRE_OFLAGS
] = { .type
= NLA_U16
},
1631 [IFLA_GRE_IKEY
] = { .type
= NLA_U32
},
1632 [IFLA_GRE_OKEY
] = { .type
= NLA_U32
},
1633 [IFLA_GRE_LOCAL
] = { .len
= FIELD_SIZEOF(struct ipv6hdr
, saddr
) },
1634 [IFLA_GRE_REMOTE
] = { .len
= FIELD_SIZEOF(struct ipv6hdr
, daddr
) },
1635 [IFLA_GRE_TTL
] = { .type
= NLA_U8
},
1636 [IFLA_GRE_ENCAP_LIMIT
] = { .type
= NLA_U8
},
1637 [IFLA_GRE_FLOWINFO
] = { .type
= NLA_U32
},
1638 [IFLA_GRE_FLAGS
] = { .type
= NLA_U32
},
1641 static struct rtnl_link_ops ip6gre_link_ops __read_mostly
= {
1643 .maxtype
= IFLA_GRE_MAX
,
1644 .policy
= ip6gre_policy
,
1645 .priv_size
= sizeof(struct ip6_tnl
),
1646 .setup
= ip6gre_tunnel_setup
,
1647 .validate
= ip6gre_tunnel_validate
,
1648 .newlink
= ip6gre_newlink
,
1649 .changelink
= ip6gre_changelink
,
1650 .dellink
= ip6gre_dellink
,
1651 .get_size
= ip6gre_get_size
,
1652 .fill_info
= ip6gre_fill_info
,
1655 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly
= {
1656 .kind
= "ip6gretap",
1657 .maxtype
= IFLA_GRE_MAX
,
1658 .policy
= ip6gre_policy
,
1659 .priv_size
= sizeof(struct ip6_tnl
),
1660 .setup
= ip6gre_tap_setup
,
1661 .validate
= ip6gre_tap_validate
,
1662 .newlink
= ip6gre_newlink
,
1663 .changelink
= ip6gre_changelink
,
1664 .get_size
= ip6gre_get_size
,
1665 .fill_info
= ip6gre_fill_info
,
1669 * And now the modules code and kernel interface.
1672 static int __init
ip6gre_init(void)
1676 pr_info("GRE over IPv6 tunneling driver\n");
1678 err
= register_pernet_device(&ip6gre_net_ops
);
1682 err
= inet6_add_protocol(&ip6gre_protocol
, IPPROTO_GRE
);
1684 pr_info("%s: can't add protocol\n", __func__
);
1685 goto add_proto_failed
;
1688 err
= rtnl_link_register(&ip6gre_link_ops
);
1690 goto rtnl_link_failed
;
1692 err
= rtnl_link_register(&ip6gre_tap_ops
);
1694 goto tap_ops_failed
;
1700 rtnl_link_unregister(&ip6gre_link_ops
);
1702 inet6_del_protocol(&ip6gre_protocol
, IPPROTO_GRE
);
1704 unregister_pernet_device(&ip6gre_net_ops
);
1708 static void __exit
ip6gre_fini(void)
1710 rtnl_link_unregister(&ip6gre_tap_ops
);
1711 rtnl_link_unregister(&ip6gre_link_ops
);
1712 inet6_del_protocol(&ip6gre_protocol
, IPPROTO_GRE
);
1713 unregister_pernet_device(&ip6gre_net_ops
);
1716 module_init(ip6gre_init
);
1717 module_exit(ip6gre_fini
);
1718 MODULE_LICENSE("GPL");
1719 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1720 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1721 MODULE_ALIAS_RTNL_LINK("ip6gre");
1722 MODULE_ALIAS_NETDEV("ip6gre0");