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 IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
65 #define IPV6_TCLASS_SHIFT 20
67 #define HASH_SIZE_SHIFT 5
68 #define HASH_SIZE (1 << HASH_SIZE_SHIFT)
70 static int ip6gre_net_id __read_mostly
;
72 struct ip6_tnl __rcu
*tunnels
[4][HASH_SIZE
];
74 struct net_device
*fb_tunnel_dev
;
77 static struct rtnl_link_ops ip6gre_link_ops __read_mostly
;
78 static int ip6gre_tunnel_init(struct net_device
*dev
);
79 static void ip6gre_tunnel_setup(struct net_device
*dev
);
80 static void ip6gre_tunnel_link(struct ip6gre_net
*ign
, struct ip6_tnl
*t
);
81 static void ip6gre_tnl_link_config(struct ip6_tnl
*t
, int set_mtu
);
83 /* Tunnel hash table */
93 We require exact key match i.e. if a key is present in packet
94 it will match only tunnel with the same key; if it is not present,
95 it will match only keyless tunnel.
97 All keysless packets, if not matched configured keyless tunnels
98 will match fallback tunnel.
101 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(HASH_SIZE - 1))
102 static u32
HASH_ADDR(const struct in6_addr
*addr
)
104 u32 hash
= ipv6_addr_hash(addr
);
106 return hash_32(hash
, HASH_SIZE_SHIFT
);
109 #define tunnels_r_l tunnels[3]
110 #define tunnels_r tunnels[2]
111 #define tunnels_l tunnels[1]
112 #define tunnels_wc tunnels[0]
114 /* Given src, dst and key, find appropriate for input tunnel. */
116 static struct ip6_tnl
*ip6gre_tunnel_lookup(struct net_device
*dev
,
117 const struct in6_addr
*remote
, const struct in6_addr
*local
,
118 __be32 key
, __be16 gre_proto
)
120 struct net
*net
= dev_net(dev
);
121 int link
= dev
->ifindex
;
122 unsigned int h0
= HASH_ADDR(remote
);
123 unsigned int h1
= HASH_KEY(key
);
124 struct ip6_tnl
*t
, *cand
= NULL
;
125 struct ip6gre_net
*ign
= net_generic(net
, ip6gre_net_id
);
126 int dev_type
= (gre_proto
== htons(ETH_P_TEB
)) ?
127 ARPHRD_ETHER
: ARPHRD_IP6GRE
;
128 int score
, cand_score
= 4;
130 for_each_ip_tunnel_rcu(t
, ign
->tunnels_r_l
[h0
^ h1
]) {
131 if (!ipv6_addr_equal(local
, &t
->parms
.laddr
) ||
132 !ipv6_addr_equal(remote
, &t
->parms
.raddr
) ||
133 key
!= t
->parms
.i_key
||
134 !(t
->dev
->flags
& IFF_UP
))
137 if (t
->dev
->type
!= ARPHRD_IP6GRE
&&
138 t
->dev
->type
!= dev_type
)
142 if (t
->parms
.link
!= link
)
144 if (t
->dev
->type
!= dev_type
)
149 if (score
< cand_score
) {
155 for_each_ip_tunnel_rcu(t
, ign
->tunnels_r
[h0
^ h1
]) {
156 if (!ipv6_addr_equal(remote
, &t
->parms
.raddr
) ||
157 key
!= t
->parms
.i_key
||
158 !(t
->dev
->flags
& IFF_UP
))
161 if (t
->dev
->type
!= ARPHRD_IP6GRE
&&
162 t
->dev
->type
!= dev_type
)
166 if (t
->parms
.link
!= link
)
168 if (t
->dev
->type
!= dev_type
)
173 if (score
< cand_score
) {
179 for_each_ip_tunnel_rcu(t
, ign
->tunnels_l
[h1
]) {
180 if ((!ipv6_addr_equal(local
, &t
->parms
.laddr
) &&
181 (!ipv6_addr_equal(local
, &t
->parms
.raddr
) ||
182 !ipv6_addr_is_multicast(local
))) ||
183 key
!= t
->parms
.i_key
||
184 !(t
->dev
->flags
& IFF_UP
))
187 if (t
->dev
->type
!= ARPHRD_IP6GRE
&&
188 t
->dev
->type
!= dev_type
)
192 if (t
->parms
.link
!= link
)
194 if (t
->dev
->type
!= dev_type
)
199 if (score
< cand_score
) {
205 for_each_ip_tunnel_rcu(t
, ign
->tunnels_wc
[h1
]) {
206 if (t
->parms
.i_key
!= key
||
207 !(t
->dev
->flags
& IFF_UP
))
210 if (t
->dev
->type
!= ARPHRD_IP6GRE
&&
211 t
->dev
->type
!= dev_type
)
215 if (t
->parms
.link
!= link
)
217 if (t
->dev
->type
!= dev_type
)
222 if (score
< cand_score
) {
231 dev
= ign
->fb_tunnel_dev
;
232 if (dev
->flags
& IFF_UP
)
233 return netdev_priv(dev
);
238 static struct ip6_tnl __rcu
**__ip6gre_bucket(struct ip6gre_net
*ign
,
239 const struct __ip6_tnl_parm
*p
)
241 const struct in6_addr
*remote
= &p
->raddr
;
242 const struct in6_addr
*local
= &p
->laddr
;
243 unsigned int h
= HASH_KEY(p
->i_key
);
246 if (!ipv6_addr_any(local
))
248 if (!ipv6_addr_any(remote
) && !ipv6_addr_is_multicast(remote
)) {
250 h
^= HASH_ADDR(remote
);
253 return &ign
->tunnels
[prio
][h
];
256 static inline struct ip6_tnl __rcu
**ip6gre_bucket(struct ip6gre_net
*ign
,
257 const struct ip6_tnl
*t
)
259 return __ip6gre_bucket(ign
, &t
->parms
);
262 static void ip6gre_tunnel_link(struct ip6gre_net
*ign
, struct ip6_tnl
*t
)
264 struct ip6_tnl __rcu
**tp
= ip6gre_bucket(ign
, t
);
266 rcu_assign_pointer(t
->next
, rtnl_dereference(*tp
));
267 rcu_assign_pointer(*tp
, t
);
270 static void ip6gre_tunnel_unlink(struct ip6gre_net
*ign
, struct ip6_tnl
*t
)
272 struct ip6_tnl __rcu
**tp
;
273 struct ip6_tnl
*iter
;
275 for (tp
= ip6gre_bucket(ign
, t
);
276 (iter
= rtnl_dereference(*tp
)) != NULL
;
279 rcu_assign_pointer(*tp
, t
->next
);
285 static struct ip6_tnl
*ip6gre_tunnel_find(struct net
*net
,
286 const struct __ip6_tnl_parm
*parms
,
289 const struct in6_addr
*remote
= &parms
->raddr
;
290 const struct in6_addr
*local
= &parms
->laddr
;
291 __be32 key
= parms
->i_key
;
292 int link
= parms
->link
;
294 struct ip6_tnl __rcu
**tp
;
295 struct ip6gre_net
*ign
= net_generic(net
, ip6gre_net_id
);
297 for (tp
= __ip6gre_bucket(ign
, parms
);
298 (t
= rtnl_dereference(*tp
)) != NULL
;
300 if (ipv6_addr_equal(local
, &t
->parms
.laddr
) &&
301 ipv6_addr_equal(remote
, &t
->parms
.raddr
) &&
302 key
== t
->parms
.i_key
&&
303 link
== t
->parms
.link
&&
304 type
== t
->dev
->type
)
310 static struct ip6_tnl
*ip6gre_tunnel_locate(struct net
*net
,
311 const struct __ip6_tnl_parm
*parms
, int create
)
313 struct ip6_tnl
*t
, *nt
;
314 struct net_device
*dev
;
316 struct ip6gre_net
*ign
= net_generic(net
, ip6gre_net_id
);
318 t
= ip6gre_tunnel_find(net
, parms
, ARPHRD_IP6GRE
);
323 strlcpy(name
, parms
->name
, IFNAMSIZ
);
325 strcpy(name
, "ip6gre%d");
327 dev
= alloc_netdev(sizeof(*t
), name
, ip6gre_tunnel_setup
);
331 dev_net_set(dev
, net
);
333 nt
= netdev_priv(dev
);
335 dev
->rtnl_link_ops
= &ip6gre_link_ops
;
338 ip6gre_tnl_link_config(nt
, 1);
340 if (register_netdevice(dev
) < 0)
343 /* Can use a lockless transmit, unless we generate output sequences */
344 if (!(nt
->parms
.o_flags
& GRE_SEQ
))
345 dev
->features
|= NETIF_F_LLTX
;
348 ip6gre_tunnel_link(ign
, nt
);
356 static void ip6gre_tunnel_uninit(struct net_device
*dev
)
358 struct net
*net
= dev_net(dev
);
359 struct ip6gre_net
*ign
= net_generic(net
, ip6gre_net_id
);
361 ip6gre_tunnel_unlink(ign
, netdev_priv(dev
));
366 static void ip6gre_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
367 u8 type
, u8 code
, int offset
, __be32 info
)
369 const struct ipv6hdr
*ipv6h
= (const struct ipv6hdr
*)skb
->data
;
370 __be16
*p
= (__be16
*)(skb
->data
+ offset
);
371 int grehlen
= offset
+ 4;
376 if (flags
&(GRE_CSUM
|GRE_KEY
|GRE_SEQ
|GRE_ROUTING
|GRE_VERSION
)) {
377 if (flags
&(GRE_VERSION
|GRE_ROUTING
))
386 /* If only 8 bytes returned, keyed message will be dropped here */
387 if (!pskb_may_pull(skb
, grehlen
))
389 ipv6h
= (const struct ipv6hdr
*)skb
->data
;
390 p
= (__be16
*)(skb
->data
+ offset
);
392 t
= ip6gre_tunnel_lookup(skb
->dev
, &ipv6h
->daddr
, &ipv6h
->saddr
,
394 *(((__be32
*)p
) + (grehlen
/ 4) - 1) : 0,
401 struct ipv6_tlv_tnl_enc_lim
*tel
;
403 case ICMPV6_DEST_UNREACH
:
404 net_warn_ratelimited("%s: Path to destination invalid or inactive!\n",
407 case ICMPV6_TIME_EXCEED
:
408 if (code
== ICMPV6_EXC_HOPLIMIT
) {
409 net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
413 case ICMPV6_PARAMPROB
:
415 if (code
== ICMPV6_HDR_FIELD
)
416 teli
= ip6_tnl_parse_tlv_enc_lim(skb
, skb
->data
);
418 if (teli
&& teli
== info
- 2) {
419 tel
= (struct ipv6_tlv_tnl_enc_lim
*) &skb
->data
[teli
];
420 if (tel
->encap_limit
== 0) {
421 net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
425 net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
429 case ICMPV6_PKT_TOOBIG
:
431 if (mtu
< IPV6_MIN_MTU
)
437 if (time_before(jiffies
, t
->err_time
+ IP6TUNNEL_ERR_TIMEO
))
441 t
->err_time
= jiffies
;
444 static int ip6gre_rcv(struct sk_buff
*skb
)
446 const struct ipv6hdr
*ipv6h
;
452 struct ip6_tnl
*tunnel
;
457 if (!pskb_may_pull(skb
, sizeof(struct in6_addr
)))
460 ipv6h
= ipv6_hdr(skb
);
462 flags
= *(__be16
*)h
;
464 if (flags
&(GRE_CSUM
|GRE_KEY
|GRE_ROUTING
|GRE_SEQ
|GRE_VERSION
)) {
465 /* - Version must be 0.
466 - We do not support routing headers.
468 if (flags
&(GRE_VERSION
|GRE_ROUTING
))
471 if (flags
&GRE_CSUM
) {
472 switch (skb
->ip_summed
) {
473 case CHECKSUM_COMPLETE
:
474 csum
= csum_fold(skb
->csum
);
480 csum
= __skb_checksum_complete(skb
);
481 skb
->ip_summed
= CHECKSUM_COMPLETE
;
486 key
= *(__be32
*)(h
+ offset
);
490 seqno
= ntohl(*(__be32
*)(h
+ offset
));
495 gre_proto
= *(__be16
*)(h
+ 2);
497 tunnel
= ip6gre_tunnel_lookup(skb
->dev
,
498 &ipv6h
->saddr
, &ipv6h
->daddr
, key
,
501 struct pcpu_tstats
*tstats
;
503 if (!xfrm6_policy_check(NULL
, XFRM_POLICY_IN
, skb
))
506 if (!ip6_tnl_rcv_ctl(tunnel
, &ipv6h
->daddr
, &ipv6h
->saddr
)) {
507 tunnel
->dev
->stats
.rx_dropped
++;
513 skb
->protocol
= gre_proto
;
514 /* WCCP version 1 and 2 protocol decoding.
515 * - Change protocol to IP
516 * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header
518 if (flags
== 0 && gre_proto
== htons(ETH_P_WCCP
)) {
519 skb
->protocol
= htons(ETH_P_IP
);
520 if ((*(h
+ offset
) & 0xF0) != 0x40)
524 skb
->mac_header
= skb
->network_header
;
525 __pskb_pull(skb
, offset
);
526 skb_postpull_rcsum(skb
, skb_transport_header(skb
), offset
);
527 skb
->pkt_type
= PACKET_HOST
;
529 if (((flags
&GRE_CSUM
) && csum
) ||
530 (!(flags
&GRE_CSUM
) && tunnel
->parms
.i_flags
&GRE_CSUM
)) {
531 tunnel
->dev
->stats
.rx_crc_errors
++;
532 tunnel
->dev
->stats
.rx_errors
++;
535 if (tunnel
->parms
.i_flags
&GRE_SEQ
) {
536 if (!(flags
&GRE_SEQ
) ||
538 (s32
)(seqno
- tunnel
->i_seqno
) < 0)) {
539 tunnel
->dev
->stats
.rx_fifo_errors
++;
540 tunnel
->dev
->stats
.rx_errors
++;
543 tunnel
->i_seqno
= seqno
+ 1;
546 /* Warning: All skb pointers will be invalidated! */
547 if (tunnel
->dev
->type
== ARPHRD_ETHER
) {
548 if (!pskb_may_pull(skb
, ETH_HLEN
)) {
549 tunnel
->dev
->stats
.rx_length_errors
++;
550 tunnel
->dev
->stats
.rx_errors
++;
554 ipv6h
= ipv6_hdr(skb
);
555 skb
->protocol
= eth_type_trans(skb
, tunnel
->dev
);
556 skb_postpull_rcsum(skb
, eth_hdr(skb
), ETH_HLEN
);
559 __skb_tunnel_rx(skb
, tunnel
->dev
);
561 skb_reset_network_header(skb
);
563 err
= IP6_ECN_decapsulate(ipv6h
, skb
);
566 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
568 ipv6_get_dsfield(ipv6h
));
570 ++tunnel
->dev
->stats
.rx_frame_errors
;
571 ++tunnel
->dev
->stats
.rx_errors
;
576 tstats
= this_cpu_ptr(tunnel
->dev
->tstats
);
577 u64_stats_update_begin(&tstats
->syncp
);
578 tstats
->rx_packets
++;
579 tstats
->rx_bytes
+= skb
->len
;
580 u64_stats_update_end(&tstats
->syncp
);
586 icmpv6_send(skb
, ICMPV6_DEST_UNREACH
, ICMPV6_PORT_UNREACH
, 0);
593 struct ipv6_tel_txoption
{
594 struct ipv6_txoptions ops
;
598 static void init_tel_txopt(struct ipv6_tel_txoption
*opt
, __u8 encap_limit
)
600 memset(opt
, 0, sizeof(struct ipv6_tel_txoption
));
602 opt
->dst_opt
[2] = IPV6_TLV_TNL_ENCAP_LIMIT
;
604 opt
->dst_opt
[4] = encap_limit
;
605 opt
->dst_opt
[5] = IPV6_TLV_PADN
;
608 opt
->ops
.dst0opt
= (struct ipv6_opt_hdr
*) opt
->dst_opt
;
609 opt
->ops
.opt_nflen
= 8;
612 static netdev_tx_t
ip6gre_xmit2(struct sk_buff
*skb
,
613 struct net_device
*dev
,
619 struct net
*net
= dev_net(dev
);
620 struct ip6_tnl
*tunnel
= netdev_priv(dev
);
621 struct net_device
*tdev
; /* Device to other host */
622 struct ipv6hdr
*ipv6h
; /* Our new IP header */
623 unsigned int max_headroom
; /* The extra header space needed */
625 struct ipv6_tel_txoption opt
;
627 struct dst_entry
*dst
= NULL
, *ndst
= NULL
;
628 struct net_device_stats
*stats
= &tunnel
->dev
->stats
;
631 struct sk_buff
*new_skb
;
633 if (dev
->type
== ARPHRD_ETHER
)
634 IPCB(skb
)->flags
= 0;
636 if (dev
->header_ops
&& dev
->type
== ARPHRD_IP6GRE
) {
638 ipv6h
= (struct ipv6hdr
*)skb
->data
;
639 fl6
->daddr
= ipv6h
->daddr
;
641 gre_hlen
= tunnel
->hlen
;
642 fl6
->daddr
= tunnel
->parms
.raddr
;
645 if (!fl6
->flowi6_mark
)
646 dst
= ip6_tnl_dst_check(tunnel
);
649 ndst
= ip6_route_output(net
, NULL
, fl6
);
652 goto tx_err_link_failure
;
653 ndst
= xfrm_lookup(net
, ndst
, flowi6_to_flowi(fl6
), NULL
, 0);
657 goto tx_err_link_failure
;
666 net_warn_ratelimited("%s: Local routing loop detected!\n",
668 goto tx_err_dst_release
;
671 mtu
= dst_mtu(dst
) - sizeof(*ipv6h
);
672 if (encap_limit
>= 0) {
676 if (mtu
< IPV6_MIN_MTU
)
679 skb_dst(skb
)->ops
->update_pmtu(skb_dst(skb
), NULL
, skb
, mtu
);
680 if (skb
->len
> mtu
) {
683 goto tx_err_dst_release
;
686 if (tunnel
->err_count
> 0) {
687 if (time_before(jiffies
,
688 tunnel
->err_time
+ IP6TUNNEL_ERR_TIMEO
)) {
691 dst_link_failure(skb
);
693 tunnel
->err_count
= 0;
696 max_headroom
= LL_RESERVED_SPACE(tdev
) + gre_hlen
+ dst
->header_len
;
698 if (skb_headroom(skb
) < max_headroom
|| skb_shared(skb
) ||
699 (skb_cloned(skb
) && !skb_clone_writable(skb
, 0))) {
700 new_skb
= skb_realloc_headroom(skb
, max_headroom
);
701 if (max_headroom
> dev
->needed_headroom
)
702 dev
->needed_headroom
= max_headroom
;
704 goto tx_err_dst_release
;
707 skb_set_owner_w(new_skb
, skb
->sk
);
714 if (fl6
->flowi6_mark
) {
715 skb_dst_set(skb
, dst
);
718 skb_dst_set_noref(skb
, dst
);
722 if (encap_limit
>= 0) {
723 init_tel_txopt(&opt
, encap_limit
);
724 ipv6_push_nfrag_opts(skb
, &opt
.ops
, &proto
, NULL
);
727 if (likely(!skb
->encapsulation
)) {
728 skb_reset_inner_headers(skb
);
729 skb
->encapsulation
= 1;
732 skb_push(skb
, gre_hlen
);
733 skb_reset_network_header(skb
);
734 skb_set_transport_header(skb
, sizeof(*ipv6h
));
737 * Push down and install the IP header.
739 ipv6h
= ipv6_hdr(skb
);
740 ip6_flow_hdr(ipv6h
, INET_ECN_encapsulate(0, dsfield
), fl6
->flowlabel
);
741 ipv6h
->hop_limit
= tunnel
->parms
.hop_limit
;
742 ipv6h
->nexthdr
= proto
;
743 ipv6h
->saddr
= fl6
->saddr
;
744 ipv6h
->daddr
= fl6
->daddr
;
746 ((__be16
*)(ipv6h
+ 1))[0] = tunnel
->parms
.o_flags
;
747 ((__be16
*)(ipv6h
+ 1))[1] = (dev
->type
== ARPHRD_ETHER
) ?
748 htons(ETH_P_TEB
) : skb
->protocol
;
750 if (tunnel
->parms
.o_flags
&(GRE_KEY
|GRE_CSUM
|GRE_SEQ
)) {
751 __be32
*ptr
= (__be32
*)(((u8
*)ipv6h
) + tunnel
->hlen
- 4);
753 if (tunnel
->parms
.o_flags
&GRE_SEQ
) {
755 *ptr
= htonl(tunnel
->o_seqno
);
758 if (tunnel
->parms
.o_flags
&GRE_KEY
) {
759 *ptr
= tunnel
->parms
.o_key
;
762 if (tunnel
->parms
.o_flags
&GRE_CSUM
) {
764 *(__sum16
*)ptr
= ip_compute_csum((void *)(ipv6h
+1),
765 skb
->len
- sizeof(struct ipv6hdr
));
769 ip6tunnel_xmit(skb
, dev
);
771 ip6_tnl_dst_store(tunnel
, ndst
);
774 stats
->tx_carrier_errors
++;
775 dst_link_failure(skb
);
781 static inline int ip6gre_xmit_ipv4(struct sk_buff
*skb
, struct net_device
*dev
)
783 struct ip6_tnl
*t
= netdev_priv(dev
);
784 const struct iphdr
*iph
= ip_hdr(skb
);
785 int encap_limit
= -1;
791 if (!(t
->parms
.flags
& IP6_TNL_F_IGN_ENCAP_LIMIT
))
792 encap_limit
= t
->parms
.encap_limit
;
794 memcpy(&fl6
, &t
->fl
.u
.ip6
, sizeof(fl6
));
795 fl6
.flowi6_proto
= IPPROTO_IPIP
;
797 dsfield
= ipv4_get_dsfield(iph
);
799 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_TCLASS
)
800 fl6
.flowlabel
|= htonl((__u32
)iph
->tos
<< IPV6_TCLASS_SHIFT
)
802 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_FWMARK
)
803 fl6
.flowi6_mark
= skb
->mark
;
805 err
= ip6gre_xmit2(skb
, dev
, dsfield
, &fl6
, encap_limit
, &mtu
);
807 /* XXX: send ICMP error even if DF is not set. */
808 if (err
== -EMSGSIZE
)
809 icmp_send(skb
, ICMP_DEST_UNREACH
, ICMP_FRAG_NEEDED
,
817 static inline int ip6gre_xmit_ipv6(struct sk_buff
*skb
, struct net_device
*dev
)
819 struct ip6_tnl
*t
= netdev_priv(dev
);
820 struct ipv6hdr
*ipv6h
= ipv6_hdr(skb
);
821 int encap_limit
= -1;
828 if (ipv6_addr_equal(&t
->parms
.raddr
, &ipv6h
->saddr
))
831 offset
= ip6_tnl_parse_tlv_enc_lim(skb
, skb_network_header(skb
));
833 struct ipv6_tlv_tnl_enc_lim
*tel
;
834 tel
= (struct ipv6_tlv_tnl_enc_lim
*)&skb_network_header(skb
)[offset
];
835 if (tel
->encap_limit
== 0) {
836 icmpv6_send(skb
, ICMPV6_PARAMPROB
,
837 ICMPV6_HDR_FIELD
, offset
+ 2);
840 encap_limit
= tel
->encap_limit
- 1;
841 } else if (!(t
->parms
.flags
& IP6_TNL_F_IGN_ENCAP_LIMIT
))
842 encap_limit
= t
->parms
.encap_limit
;
844 memcpy(&fl6
, &t
->fl
.u
.ip6
, sizeof(fl6
));
845 fl6
.flowi6_proto
= IPPROTO_IPV6
;
847 dsfield
= ipv6_get_dsfield(ipv6h
);
848 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_TCLASS
)
849 fl6
.flowlabel
|= (*(__be32
*) ipv6h
& IPV6_TCLASS_MASK
);
850 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_FLOWLABEL
)
851 fl6
.flowlabel
|= (*(__be32
*) ipv6h
& IPV6_FLOWLABEL_MASK
);
852 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_FWMARK
)
853 fl6
.flowi6_mark
= skb
->mark
;
855 err
= ip6gre_xmit2(skb
, dev
, dsfield
, &fl6
, encap_limit
, &mtu
);
857 if (err
== -EMSGSIZE
)
858 icmpv6_send(skb
, ICMPV6_PKT_TOOBIG
, 0, mtu
);
866 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
867 * @t: the outgoing tunnel device
868 * @hdr: IPv6 header from the incoming packet
871 * Avoid trivial tunneling loop by checking that tunnel exit-point
872 * doesn't match source of incoming packet.
879 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl
*t
,
880 const struct ipv6hdr
*hdr
)
882 return ipv6_addr_equal(&t
->parms
.raddr
, &hdr
->saddr
);
885 static int ip6gre_xmit_other(struct sk_buff
*skb
, struct net_device
*dev
)
887 struct ip6_tnl
*t
= netdev_priv(dev
);
888 int encap_limit
= -1;
893 if (!(t
->parms
.flags
& IP6_TNL_F_IGN_ENCAP_LIMIT
))
894 encap_limit
= t
->parms
.encap_limit
;
896 memcpy(&fl6
, &t
->fl
.u
.ip6
, sizeof(fl6
));
897 fl6
.flowi6_proto
= skb
->protocol
;
899 err
= ip6gre_xmit2(skb
, dev
, 0, &fl6
, encap_limit
, &mtu
);
904 static netdev_tx_t
ip6gre_tunnel_xmit(struct sk_buff
*skb
,
905 struct net_device
*dev
)
907 struct ip6_tnl
*t
= netdev_priv(dev
);
908 struct net_device_stats
*stats
= &t
->dev
->stats
;
911 if (!ip6_tnl_xmit_ctl(t
))
914 switch (skb
->protocol
) {
915 case htons(ETH_P_IP
):
916 ret
= ip6gre_xmit_ipv4(skb
, dev
);
918 case htons(ETH_P_IPV6
):
919 ret
= ip6gre_xmit_ipv6(skb
, dev
);
922 ret
= ip6gre_xmit_other(skb
, dev
);
938 static void ip6gre_tnl_link_config(struct ip6_tnl
*t
, int set_mtu
)
940 struct net_device
*dev
= t
->dev
;
941 struct __ip6_tnl_parm
*p
= &t
->parms
;
942 struct flowi6
*fl6
= &t
->fl
.u
.ip6
;
943 int addend
= sizeof(struct ipv6hdr
) + 4;
945 if (dev
->type
!= ARPHRD_ETHER
) {
946 memcpy(dev
->dev_addr
, &p
->laddr
, sizeof(struct in6_addr
));
947 memcpy(dev
->broadcast
, &p
->raddr
, sizeof(struct in6_addr
));
950 /* Set up flowi template */
951 fl6
->saddr
= p
->laddr
;
952 fl6
->daddr
= p
->raddr
;
953 fl6
->flowi6_oif
= p
->link
;
956 if (!(p
->flags
&IP6_TNL_F_USE_ORIG_TCLASS
))
957 fl6
->flowlabel
|= IPV6_TCLASS_MASK
& p
->flowinfo
;
958 if (!(p
->flags
&IP6_TNL_F_USE_ORIG_FLOWLABEL
))
959 fl6
->flowlabel
|= IPV6_FLOWLABEL_MASK
& p
->flowinfo
;
961 p
->flags
&= ~(IP6_TNL_F_CAP_XMIT
|IP6_TNL_F_CAP_RCV
|IP6_TNL_F_CAP_PER_PACKET
);
962 p
->flags
|= ip6_tnl_get_cap(t
, &p
->laddr
, &p
->raddr
);
964 if (p
->flags
&IP6_TNL_F_CAP_XMIT
&&
965 p
->flags
&IP6_TNL_F_CAP_RCV
&& dev
->type
!= ARPHRD_ETHER
)
966 dev
->flags
|= IFF_POINTOPOINT
;
968 dev
->flags
&= ~IFF_POINTOPOINT
;
970 dev
->iflink
= p
->link
;
972 /* Precalculate GRE options length */
973 if (t
->parms
.o_flags
&(GRE_CSUM
|GRE_KEY
|GRE_SEQ
)) {
974 if (t
->parms
.o_flags
&GRE_CSUM
)
976 if (t
->parms
.o_flags
&GRE_KEY
)
978 if (t
->parms
.o_flags
&GRE_SEQ
)
982 if (p
->flags
& IP6_TNL_F_CAP_XMIT
) {
983 int strict
= (ipv6_addr_type(&p
->raddr
) &
984 (IPV6_ADDR_MULTICAST
|IPV6_ADDR_LINKLOCAL
));
986 struct rt6_info
*rt
= rt6_lookup(dev_net(dev
),
987 &p
->raddr
, &p
->laddr
,
994 dev
->hard_header_len
= rt
->dst
.dev
->hard_header_len
+ addend
;
997 dev
->mtu
= rt
->dst
.dev
->mtu
- addend
;
998 if (!(t
->parms
.flags
& IP6_TNL_F_IGN_ENCAP_LIMIT
))
1001 if (dev
->mtu
< IPV6_MIN_MTU
)
1002 dev
->mtu
= IPV6_MIN_MTU
;
1011 static int ip6gre_tnl_change(struct ip6_tnl
*t
,
1012 const struct __ip6_tnl_parm
*p
, int set_mtu
)
1014 t
->parms
.laddr
= p
->laddr
;
1015 t
->parms
.raddr
= p
->raddr
;
1016 t
->parms
.flags
= p
->flags
;
1017 t
->parms
.hop_limit
= p
->hop_limit
;
1018 t
->parms
.encap_limit
= p
->encap_limit
;
1019 t
->parms
.flowinfo
= p
->flowinfo
;
1020 t
->parms
.link
= p
->link
;
1021 t
->parms
.proto
= p
->proto
;
1022 t
->parms
.i_key
= p
->i_key
;
1023 t
->parms
.o_key
= p
->o_key
;
1024 t
->parms
.i_flags
= p
->i_flags
;
1025 t
->parms
.o_flags
= p
->o_flags
;
1026 ip6_tnl_dst_reset(t
);
1027 ip6gre_tnl_link_config(t
, set_mtu
);
1031 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm
*p
,
1032 const struct ip6_tnl_parm2
*u
)
1034 p
->laddr
= u
->laddr
;
1035 p
->raddr
= u
->raddr
;
1036 p
->flags
= u
->flags
;
1037 p
->hop_limit
= u
->hop_limit
;
1038 p
->encap_limit
= u
->encap_limit
;
1039 p
->flowinfo
= u
->flowinfo
;
1041 p
->i_key
= u
->i_key
;
1042 p
->o_key
= u
->o_key
;
1043 p
->i_flags
= u
->i_flags
;
1044 p
->o_flags
= u
->o_flags
;
1045 memcpy(p
->name
, u
->name
, sizeof(u
->name
));
1048 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2
*u
,
1049 const struct __ip6_tnl_parm
*p
)
1051 u
->proto
= IPPROTO_GRE
;
1052 u
->laddr
= p
->laddr
;
1053 u
->raddr
= p
->raddr
;
1054 u
->flags
= p
->flags
;
1055 u
->hop_limit
= p
->hop_limit
;
1056 u
->encap_limit
= p
->encap_limit
;
1057 u
->flowinfo
= p
->flowinfo
;
1059 u
->i_key
= p
->i_key
;
1060 u
->o_key
= p
->o_key
;
1061 u
->i_flags
= p
->i_flags
;
1062 u
->o_flags
= p
->o_flags
;
1063 memcpy(u
->name
, p
->name
, sizeof(u
->name
));
1066 static int ip6gre_tunnel_ioctl(struct net_device
*dev
,
1067 struct ifreq
*ifr
, int cmd
)
1070 struct ip6_tnl_parm2 p
;
1071 struct __ip6_tnl_parm p1
;
1073 struct net
*net
= dev_net(dev
);
1074 struct ip6gre_net
*ign
= net_generic(net
, ip6gre_net_id
);
1079 if (dev
== ign
->fb_tunnel_dev
) {
1080 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
))) {
1084 ip6gre_tnl_parm_from_user(&p1
, &p
);
1085 t
= ip6gre_tunnel_locate(net
, &p1
, 0);
1088 t
= netdev_priv(dev
);
1089 memset(&p
, 0, sizeof(p
));
1090 ip6gre_tnl_parm_to_user(&p
, &t
->parms
);
1091 if (copy_to_user(ifr
->ifr_ifru
.ifru_data
, &p
, sizeof(p
)))
1098 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
1102 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
)))
1106 if ((p
.i_flags
|p
.o_flags
)&(GRE_VERSION
|GRE_ROUTING
))
1109 if (!(p
.i_flags
&GRE_KEY
))
1111 if (!(p
.o_flags
&GRE_KEY
))
1114 ip6gre_tnl_parm_from_user(&p1
, &p
);
1115 t
= ip6gre_tunnel_locate(net
, &p1
, cmd
== SIOCADDTUNNEL
);
1117 if (dev
!= ign
->fb_tunnel_dev
&& cmd
== SIOCCHGTUNNEL
) {
1119 if (t
->dev
!= dev
) {
1124 t
= netdev_priv(dev
);
1126 ip6gre_tunnel_unlink(ign
, t
);
1128 ip6gre_tnl_change(t
, &p1
, 1);
1129 ip6gre_tunnel_link(ign
, t
);
1130 netdev_state_change(dev
);
1137 memset(&p
, 0, sizeof(p
));
1138 ip6gre_tnl_parm_to_user(&p
, &t
->parms
);
1139 if (copy_to_user(ifr
->ifr_ifru
.ifru_data
, &p
, sizeof(p
)))
1142 err
= (cmd
== SIOCADDTUNNEL
? -ENOBUFS
: -ENOENT
);
1147 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
1150 if (dev
== ign
->fb_tunnel_dev
) {
1152 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
)))
1155 ip6gre_tnl_parm_from_user(&p1
, &p
);
1156 t
= ip6gre_tunnel_locate(net
, &p1
, 0);
1160 if (t
== netdev_priv(ign
->fb_tunnel_dev
))
1164 unregister_netdevice(dev
);
1176 static int ip6gre_tunnel_change_mtu(struct net_device
*dev
, int new_mtu
)
1178 struct ip6_tnl
*tunnel
= netdev_priv(dev
);
1180 new_mtu
> 0xFFF8 - dev
->hard_header_len
- tunnel
->hlen
)
1186 static int ip6gre_header(struct sk_buff
*skb
, struct net_device
*dev
,
1187 unsigned short type
,
1188 const void *daddr
, const void *saddr
, unsigned int len
)
1190 struct ip6_tnl
*t
= netdev_priv(dev
);
1191 struct ipv6hdr
*ipv6h
= (struct ipv6hdr
*)skb_push(skb
, t
->hlen
);
1192 __be16
*p
= (__be16
*)(ipv6h
+1);
1194 ip6_flow_hdr(ipv6h
, 0, t
->fl
.u
.ip6
.flowlabel
);
1195 ipv6h
->hop_limit
= t
->parms
.hop_limit
;
1196 ipv6h
->nexthdr
= NEXTHDR_GRE
;
1197 ipv6h
->saddr
= t
->parms
.laddr
;
1198 ipv6h
->daddr
= t
->parms
.raddr
;
1200 p
[0] = t
->parms
.o_flags
;
1204 * Set the source hardware address.
1208 memcpy(&ipv6h
->saddr
, saddr
, sizeof(struct in6_addr
));
1210 memcpy(&ipv6h
->daddr
, daddr
, sizeof(struct in6_addr
));
1211 if (!ipv6_addr_any(&ipv6h
->daddr
))
1217 static const struct header_ops ip6gre_header_ops
= {
1218 .create
= ip6gre_header
,
1221 static const struct net_device_ops ip6gre_netdev_ops
= {
1222 .ndo_init
= ip6gre_tunnel_init
,
1223 .ndo_uninit
= ip6gre_tunnel_uninit
,
1224 .ndo_start_xmit
= ip6gre_tunnel_xmit
,
1225 .ndo_do_ioctl
= ip6gre_tunnel_ioctl
,
1226 .ndo_change_mtu
= ip6gre_tunnel_change_mtu
,
1227 .ndo_get_stats64
= ip_tunnel_get_stats64
,
1230 static void ip6gre_dev_free(struct net_device
*dev
)
1232 free_percpu(dev
->tstats
);
1236 static void ip6gre_tunnel_setup(struct net_device
*dev
)
1240 dev
->netdev_ops
= &ip6gre_netdev_ops
;
1241 dev
->destructor
= ip6gre_dev_free
;
1243 dev
->type
= ARPHRD_IP6GRE
;
1244 dev
->hard_header_len
= LL_MAX_HEADER
+ sizeof(struct ipv6hdr
) + 4;
1245 dev
->mtu
= ETH_DATA_LEN
- sizeof(struct ipv6hdr
) - 4;
1246 t
= netdev_priv(dev
);
1247 if (!(t
->parms
.flags
& IP6_TNL_F_IGN_ENCAP_LIMIT
))
1249 dev
->flags
|= IFF_NOARP
;
1251 dev
->addr_len
= sizeof(struct in6_addr
);
1252 dev
->features
|= NETIF_F_NETNS_LOCAL
;
1253 dev
->priv_flags
&= ~IFF_XMIT_DST_RELEASE
;
1256 static int ip6gre_tunnel_init(struct net_device
*dev
)
1258 struct ip6_tnl
*tunnel
;
1260 tunnel
= netdev_priv(dev
);
1263 strcpy(tunnel
->parms
.name
, dev
->name
);
1265 memcpy(dev
->dev_addr
, &tunnel
->parms
.laddr
, sizeof(struct in6_addr
));
1266 memcpy(dev
->broadcast
, &tunnel
->parms
.raddr
, sizeof(struct in6_addr
));
1268 if (ipv6_addr_any(&tunnel
->parms
.raddr
))
1269 dev
->header_ops
= &ip6gre_header_ops
;
1271 dev
->tstats
= alloc_percpu(struct pcpu_tstats
);
1278 static void ip6gre_fb_tunnel_init(struct net_device
*dev
)
1280 struct ip6_tnl
*tunnel
= netdev_priv(dev
);
1283 strcpy(tunnel
->parms
.name
, dev
->name
);
1285 tunnel
->hlen
= sizeof(struct ipv6hdr
) + 4;
1291 static struct inet6_protocol ip6gre_protocol __read_mostly
= {
1292 .handler
= ip6gre_rcv
,
1293 .err_handler
= ip6gre_err
,
1294 .flags
= INET6_PROTO_NOPOLICY
|INET6_PROTO_FINAL
,
1297 static void ip6gre_destroy_tunnels(struct ip6gre_net
*ign
,
1298 struct list_head
*head
)
1302 for (prio
= 0; prio
< 4; prio
++) {
1304 for (h
= 0; h
< HASH_SIZE
; h
++) {
1307 t
= rtnl_dereference(ign
->tunnels
[prio
][h
]);
1310 unregister_netdevice_queue(t
->dev
, head
);
1311 t
= rtnl_dereference(t
->next
);
1317 static int __net_init
ip6gre_init_net(struct net
*net
)
1319 struct ip6gre_net
*ign
= net_generic(net
, ip6gre_net_id
);
1322 ign
->fb_tunnel_dev
= alloc_netdev(sizeof(struct ip6_tnl
), "ip6gre0",
1323 ip6gre_tunnel_setup
);
1324 if (!ign
->fb_tunnel_dev
) {
1328 dev_net_set(ign
->fb_tunnel_dev
, net
);
1330 ip6gre_fb_tunnel_init(ign
->fb_tunnel_dev
);
1331 ign
->fb_tunnel_dev
->rtnl_link_ops
= &ip6gre_link_ops
;
1333 err
= register_netdev(ign
->fb_tunnel_dev
);
1337 rcu_assign_pointer(ign
->tunnels_wc
[0],
1338 netdev_priv(ign
->fb_tunnel_dev
));
1342 ip6gre_dev_free(ign
->fb_tunnel_dev
);
1347 static void __net_exit
ip6gre_exit_net(struct net
*net
)
1349 struct ip6gre_net
*ign
;
1352 ign
= net_generic(net
, ip6gre_net_id
);
1354 ip6gre_destroy_tunnels(ign
, &list
);
1355 unregister_netdevice_many(&list
);
1359 static struct pernet_operations ip6gre_net_ops
= {
1360 .init
= ip6gre_init_net
,
1361 .exit
= ip6gre_exit_net
,
1362 .id
= &ip6gre_net_id
,
1363 .size
= sizeof(struct ip6gre_net
),
1366 static int ip6gre_tunnel_validate(struct nlattr
*tb
[], struct nlattr
*data
[])
1374 if (data
[IFLA_GRE_IFLAGS
])
1375 flags
|= nla_get_be16(data
[IFLA_GRE_IFLAGS
]);
1376 if (data
[IFLA_GRE_OFLAGS
])
1377 flags
|= nla_get_be16(data
[IFLA_GRE_OFLAGS
]);
1378 if (flags
& (GRE_VERSION
|GRE_ROUTING
))
1384 static int ip6gre_tap_validate(struct nlattr
*tb
[], struct nlattr
*data
[])
1386 struct in6_addr daddr
;
1388 if (tb
[IFLA_ADDRESS
]) {
1389 if (nla_len(tb
[IFLA_ADDRESS
]) != ETH_ALEN
)
1391 if (!is_valid_ether_addr(nla_data(tb
[IFLA_ADDRESS
])))
1392 return -EADDRNOTAVAIL
;
1398 if (data
[IFLA_GRE_REMOTE
]) {
1399 nla_memcpy(&daddr
, data
[IFLA_GRE_REMOTE
], sizeof(struct in6_addr
));
1400 if (ipv6_addr_any(&daddr
))
1405 return ip6gre_tunnel_validate(tb
, data
);
1409 static void ip6gre_netlink_parms(struct nlattr
*data
[],
1410 struct __ip6_tnl_parm
*parms
)
1412 memset(parms
, 0, sizeof(*parms
));
1417 if (data
[IFLA_GRE_LINK
])
1418 parms
->link
= nla_get_u32(data
[IFLA_GRE_LINK
]);
1420 if (data
[IFLA_GRE_IFLAGS
])
1421 parms
->i_flags
= nla_get_be16(data
[IFLA_GRE_IFLAGS
]);
1423 if (data
[IFLA_GRE_OFLAGS
])
1424 parms
->o_flags
= nla_get_be16(data
[IFLA_GRE_OFLAGS
]);
1426 if (data
[IFLA_GRE_IKEY
])
1427 parms
->i_key
= nla_get_be32(data
[IFLA_GRE_IKEY
]);
1429 if (data
[IFLA_GRE_OKEY
])
1430 parms
->o_key
= nla_get_be32(data
[IFLA_GRE_OKEY
]);
1432 if (data
[IFLA_GRE_LOCAL
])
1433 nla_memcpy(&parms
->laddr
, data
[IFLA_GRE_LOCAL
], sizeof(struct in6_addr
));
1435 if (data
[IFLA_GRE_REMOTE
])
1436 nla_memcpy(&parms
->raddr
, data
[IFLA_GRE_REMOTE
], sizeof(struct in6_addr
));
1438 if (data
[IFLA_GRE_TTL
])
1439 parms
->hop_limit
= nla_get_u8(data
[IFLA_GRE_TTL
]);
1441 if (data
[IFLA_GRE_ENCAP_LIMIT
])
1442 parms
->encap_limit
= nla_get_u8(data
[IFLA_GRE_ENCAP_LIMIT
]);
1444 if (data
[IFLA_GRE_FLOWINFO
])
1445 parms
->flowinfo
= nla_get_u32(data
[IFLA_GRE_FLOWINFO
]);
1447 if (data
[IFLA_GRE_FLAGS
])
1448 parms
->flags
= nla_get_u32(data
[IFLA_GRE_FLAGS
]);
1451 static int ip6gre_tap_init(struct net_device
*dev
)
1453 struct ip6_tnl
*tunnel
;
1455 tunnel
= netdev_priv(dev
);
1458 strcpy(tunnel
->parms
.name
, dev
->name
);
1460 ip6gre_tnl_link_config(tunnel
, 1);
1462 dev
->tstats
= alloc_percpu(struct pcpu_tstats
);
1469 static const struct net_device_ops ip6gre_tap_netdev_ops
= {
1470 .ndo_init
= ip6gre_tap_init
,
1471 .ndo_uninit
= ip6gre_tunnel_uninit
,
1472 .ndo_start_xmit
= ip6gre_tunnel_xmit
,
1473 .ndo_set_mac_address
= eth_mac_addr
,
1474 .ndo_validate_addr
= eth_validate_addr
,
1475 .ndo_change_mtu
= ip6gre_tunnel_change_mtu
,
1476 .ndo_get_stats64
= ip_tunnel_get_stats64
,
1479 static void ip6gre_tap_setup(struct net_device
*dev
)
1484 dev
->netdev_ops
= &ip6gre_tap_netdev_ops
;
1485 dev
->destructor
= ip6gre_dev_free
;
1488 dev
->features
|= NETIF_F_NETNS_LOCAL
;
1491 static int ip6gre_newlink(struct net
*src_net
, struct net_device
*dev
,
1492 struct nlattr
*tb
[], struct nlattr
*data
[])
1495 struct net
*net
= dev_net(dev
);
1496 struct ip6gre_net
*ign
= net_generic(net
, ip6gre_net_id
);
1499 nt
= netdev_priv(dev
);
1500 ip6gre_netlink_parms(data
, &nt
->parms
);
1502 if (ip6gre_tunnel_find(net
, &nt
->parms
, dev
->type
))
1505 if (dev
->type
== ARPHRD_ETHER
&& !tb
[IFLA_ADDRESS
])
1506 eth_hw_addr_random(dev
);
1509 ip6gre_tnl_link_config(nt
, !tb
[IFLA_MTU
]);
1511 /* Can use a lockless transmit, unless we generate output sequences */
1512 if (!(nt
->parms
.o_flags
& GRE_SEQ
))
1513 dev
->features
|= NETIF_F_LLTX
;
1515 err
= register_netdevice(dev
);
1520 ip6gre_tunnel_link(ign
, nt
);
1526 static int ip6gre_changelink(struct net_device
*dev
, struct nlattr
*tb
[],
1527 struct nlattr
*data
[])
1529 struct ip6_tnl
*t
, *nt
;
1530 struct net
*net
= dev_net(dev
);
1531 struct ip6gre_net
*ign
= net_generic(net
, ip6gre_net_id
);
1532 struct __ip6_tnl_parm p
;
1534 if (dev
== ign
->fb_tunnel_dev
)
1537 nt
= netdev_priv(dev
);
1538 ip6gre_netlink_parms(data
, &p
);
1540 t
= ip6gre_tunnel_locate(net
, &p
, 0);
1548 ip6gre_tunnel_unlink(ign
, t
);
1549 ip6gre_tnl_change(t
, &p
, !tb
[IFLA_MTU
]);
1550 ip6gre_tunnel_link(ign
, t
);
1551 netdev_state_change(dev
);
1557 static size_t ip6gre_get_size(const struct net_device
*dev
)
1562 /* IFLA_GRE_IFLAGS */
1564 /* IFLA_GRE_OFLAGS */
1570 /* IFLA_GRE_LOCAL */
1571 nla_total_size(sizeof(struct in6_addr
)) +
1572 /* IFLA_GRE_REMOTE */
1573 nla_total_size(sizeof(struct in6_addr
)) +
1578 /* IFLA_GRE_ENCAP_LIMIT */
1580 /* IFLA_GRE_FLOWINFO */
1582 /* IFLA_GRE_FLAGS */
1587 static int ip6gre_fill_info(struct sk_buff
*skb
, const struct net_device
*dev
)
1589 struct ip6_tnl
*t
= netdev_priv(dev
);
1590 struct __ip6_tnl_parm
*p
= &t
->parms
;
1592 if (nla_put_u32(skb
, IFLA_GRE_LINK
, p
->link
) ||
1593 nla_put_be16(skb
, IFLA_GRE_IFLAGS
, p
->i_flags
) ||
1594 nla_put_be16(skb
, IFLA_GRE_OFLAGS
, p
->o_flags
) ||
1595 nla_put_be32(skb
, IFLA_GRE_IKEY
, p
->i_key
) ||
1596 nla_put_be32(skb
, IFLA_GRE_OKEY
, p
->o_key
) ||
1597 nla_put(skb
, IFLA_GRE_LOCAL
, sizeof(struct in6_addr
), &p
->laddr
) ||
1598 nla_put(skb
, IFLA_GRE_REMOTE
, sizeof(struct in6_addr
), &p
->raddr
) ||
1599 nla_put_u8(skb
, IFLA_GRE_TTL
, p
->hop_limit
) ||
1600 /*nla_put_u8(skb, IFLA_GRE_TOS, t->priority) ||*/
1601 nla_put_u8(skb
, IFLA_GRE_ENCAP_LIMIT
, p
->encap_limit
) ||
1602 nla_put_be32(skb
, IFLA_GRE_FLOWINFO
, p
->flowinfo
) ||
1603 nla_put_u32(skb
, IFLA_GRE_FLAGS
, p
->flags
))
1604 goto nla_put_failure
;
1611 static const struct nla_policy ip6gre_policy
[IFLA_GRE_MAX
+ 1] = {
1612 [IFLA_GRE_LINK
] = { .type
= NLA_U32
},
1613 [IFLA_GRE_IFLAGS
] = { .type
= NLA_U16
},
1614 [IFLA_GRE_OFLAGS
] = { .type
= NLA_U16
},
1615 [IFLA_GRE_IKEY
] = { .type
= NLA_U32
},
1616 [IFLA_GRE_OKEY
] = { .type
= NLA_U32
},
1617 [IFLA_GRE_LOCAL
] = { .len
= FIELD_SIZEOF(struct ipv6hdr
, saddr
) },
1618 [IFLA_GRE_REMOTE
] = { .len
= FIELD_SIZEOF(struct ipv6hdr
, daddr
) },
1619 [IFLA_GRE_TTL
] = { .type
= NLA_U8
},
1620 [IFLA_GRE_ENCAP_LIMIT
] = { .type
= NLA_U8
},
1621 [IFLA_GRE_FLOWINFO
] = { .type
= NLA_U32
},
1622 [IFLA_GRE_FLAGS
] = { .type
= NLA_U32
},
1625 static struct rtnl_link_ops ip6gre_link_ops __read_mostly
= {
1627 .maxtype
= IFLA_GRE_MAX
,
1628 .policy
= ip6gre_policy
,
1629 .priv_size
= sizeof(struct ip6_tnl
),
1630 .setup
= ip6gre_tunnel_setup
,
1631 .validate
= ip6gre_tunnel_validate
,
1632 .newlink
= ip6gre_newlink
,
1633 .changelink
= ip6gre_changelink
,
1634 .get_size
= ip6gre_get_size
,
1635 .fill_info
= ip6gre_fill_info
,
1638 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly
= {
1639 .kind
= "ip6gretap",
1640 .maxtype
= IFLA_GRE_MAX
,
1641 .policy
= ip6gre_policy
,
1642 .priv_size
= sizeof(struct ip6_tnl
),
1643 .setup
= ip6gre_tap_setup
,
1644 .validate
= ip6gre_tap_validate
,
1645 .newlink
= ip6gre_newlink
,
1646 .changelink
= ip6gre_changelink
,
1647 .get_size
= ip6gre_get_size
,
1648 .fill_info
= ip6gre_fill_info
,
1652 * And now the modules code and kernel interface.
1655 static int __init
ip6gre_init(void)
1659 pr_info("GRE over IPv6 tunneling driver\n");
1661 err
= register_pernet_device(&ip6gre_net_ops
);
1665 err
= inet6_add_protocol(&ip6gre_protocol
, IPPROTO_GRE
);
1667 pr_info("%s: can't add protocol\n", __func__
);
1668 goto add_proto_failed
;
1671 err
= rtnl_link_register(&ip6gre_link_ops
);
1673 goto rtnl_link_failed
;
1675 err
= rtnl_link_register(&ip6gre_tap_ops
);
1677 goto tap_ops_failed
;
1683 rtnl_link_unregister(&ip6gre_link_ops
);
1685 inet6_del_protocol(&ip6gre_protocol
, IPPROTO_GRE
);
1687 unregister_pernet_device(&ip6gre_net_ops
);
1691 static void __exit
ip6gre_fini(void)
1693 rtnl_link_unregister(&ip6gre_tap_ops
);
1694 rtnl_link_unregister(&ip6gre_link_ops
);
1695 inet6_del_protocol(&ip6gre_protocol
, IPPROTO_GRE
);
1696 unregister_pernet_device(&ip6gre_net_ops
);
1699 module_init(ip6gre_init
);
1700 module_exit(ip6gre_fini
);
1701 MODULE_LICENSE("GPL");
1702 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1703 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1704 MODULE_ALIAS_RTNL_LINK("ip6gre");
1705 MODULE_ALIAS_NETDEV("ip6gre0");