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
, NET_NAME_UNKNOWN
,
326 ip6gre_tunnel_setup
);
330 dev_net_set(dev
, net
);
332 nt
= netdev_priv(dev
);
334 dev
->rtnl_link_ops
= &ip6gre_link_ops
;
337 nt
->net
= dev_net(dev
);
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 ip6_tnl
*t
= netdev_priv(dev
);
359 struct ip6gre_net
*ign
= net_generic(t
->net
, ip6gre_net_id
);
361 ip6gre_tunnel_unlink(ign
, t
);
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 csum
= skb_checksum_simple_validate(skb
);
476 key
= *(__be32
*)(h
+ offset
);
480 seqno
= ntohl(*(__be32
*)(h
+ offset
));
485 gre_proto
= *(__be16
*)(h
+ 2);
487 tunnel
= ip6gre_tunnel_lookup(skb
->dev
,
488 &ipv6h
->saddr
, &ipv6h
->daddr
, key
,
491 struct pcpu_sw_netstats
*tstats
;
493 if (!xfrm6_policy_check(NULL
, XFRM_POLICY_IN
, skb
))
496 if (!ip6_tnl_rcv_ctl(tunnel
, &ipv6h
->daddr
, &ipv6h
->saddr
)) {
497 tunnel
->dev
->stats
.rx_dropped
++;
501 skb
->protocol
= gre_proto
;
502 /* WCCP version 1 and 2 protocol decoding.
503 * - Change protocol to IP
504 * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header
506 if (flags
== 0 && gre_proto
== htons(ETH_P_WCCP
)) {
507 skb
->protocol
= htons(ETH_P_IP
);
508 if ((*(h
+ offset
) & 0xF0) != 0x40)
512 skb
->mac_header
= skb
->network_header
;
513 __pskb_pull(skb
, offset
);
514 skb_postpull_rcsum(skb
, skb_transport_header(skb
), offset
);
516 if (((flags
&GRE_CSUM
) && csum
) ||
517 (!(flags
&GRE_CSUM
) && tunnel
->parms
.i_flags
&GRE_CSUM
)) {
518 tunnel
->dev
->stats
.rx_crc_errors
++;
519 tunnel
->dev
->stats
.rx_errors
++;
522 if (tunnel
->parms
.i_flags
&GRE_SEQ
) {
523 if (!(flags
&GRE_SEQ
) ||
525 (s32
)(seqno
- tunnel
->i_seqno
) < 0)) {
526 tunnel
->dev
->stats
.rx_fifo_errors
++;
527 tunnel
->dev
->stats
.rx_errors
++;
530 tunnel
->i_seqno
= seqno
+ 1;
533 /* Warning: All skb pointers will be invalidated! */
534 if (tunnel
->dev
->type
== ARPHRD_ETHER
) {
535 if (!pskb_may_pull(skb
, ETH_HLEN
)) {
536 tunnel
->dev
->stats
.rx_length_errors
++;
537 tunnel
->dev
->stats
.rx_errors
++;
541 ipv6h
= ipv6_hdr(skb
);
542 skb
->protocol
= eth_type_trans(skb
, tunnel
->dev
);
543 skb_postpull_rcsum(skb
, eth_hdr(skb
), ETH_HLEN
);
546 __skb_tunnel_rx(skb
, tunnel
->dev
, tunnel
->net
);
548 skb_reset_network_header(skb
);
550 err
= IP6_ECN_decapsulate(ipv6h
, skb
);
553 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
555 ipv6_get_dsfield(ipv6h
));
557 ++tunnel
->dev
->stats
.rx_frame_errors
;
558 ++tunnel
->dev
->stats
.rx_errors
;
563 tstats
= this_cpu_ptr(tunnel
->dev
->tstats
);
564 u64_stats_update_begin(&tstats
->syncp
);
565 tstats
->rx_packets
++;
566 tstats
->rx_bytes
+= skb
->len
;
567 u64_stats_update_end(&tstats
->syncp
);
573 icmpv6_send(skb
, ICMPV6_DEST_UNREACH
, ICMPV6_PORT_UNREACH
, 0);
580 struct ipv6_tel_txoption
{
581 struct ipv6_txoptions ops
;
585 static void init_tel_txopt(struct ipv6_tel_txoption
*opt
, __u8 encap_limit
)
587 memset(opt
, 0, sizeof(struct ipv6_tel_txoption
));
589 opt
->dst_opt
[2] = IPV6_TLV_TNL_ENCAP_LIMIT
;
591 opt
->dst_opt
[4] = encap_limit
;
592 opt
->dst_opt
[5] = IPV6_TLV_PADN
;
595 opt
->ops
.dst0opt
= (struct ipv6_opt_hdr
*) opt
->dst_opt
;
596 opt
->ops
.opt_nflen
= 8;
599 static netdev_tx_t
ip6gre_xmit2(struct sk_buff
*skb
,
600 struct net_device
*dev
,
606 struct ip6_tnl
*tunnel
= netdev_priv(dev
);
607 struct net
*net
= tunnel
->net
;
608 struct net_device
*tdev
; /* Device to other host */
609 struct ipv6hdr
*ipv6h
; /* Our new IP header */
610 unsigned int max_headroom
= 0; /* The extra header space needed */
612 struct ipv6_tel_txoption opt
;
614 struct dst_entry
*dst
= NULL
, *ndst
= NULL
;
615 struct net_device_stats
*stats
= &tunnel
->dev
->stats
;
618 struct sk_buff
*new_skb
;
620 if (dev
->type
== ARPHRD_ETHER
)
621 IPCB(skb
)->flags
= 0;
623 if (dev
->header_ops
&& dev
->type
== ARPHRD_IP6GRE
) {
625 ipv6h
= (struct ipv6hdr
*)skb
->data
;
626 fl6
->daddr
= ipv6h
->daddr
;
628 gre_hlen
= tunnel
->hlen
;
629 fl6
->daddr
= tunnel
->parms
.raddr
;
632 if (!fl6
->flowi6_mark
)
633 dst
= ip6_tnl_dst_check(tunnel
);
636 ndst
= ip6_route_output(net
, NULL
, fl6
);
639 goto tx_err_link_failure
;
640 ndst
= xfrm_lookup(net
, ndst
, flowi6_to_flowi(fl6
), NULL
, 0);
644 goto tx_err_link_failure
;
653 net_warn_ratelimited("%s: Local routing loop detected!\n",
655 goto tx_err_dst_release
;
658 mtu
= dst_mtu(dst
) - sizeof(*ipv6h
);
659 if (encap_limit
>= 0) {
663 if (mtu
< IPV6_MIN_MTU
)
666 skb_dst(skb
)->ops
->update_pmtu(skb_dst(skb
), NULL
, skb
, mtu
);
667 if (skb
->len
> mtu
) {
670 goto tx_err_dst_release
;
673 if (tunnel
->err_count
> 0) {
674 if (time_before(jiffies
,
675 tunnel
->err_time
+ IP6TUNNEL_ERR_TIMEO
)) {
678 dst_link_failure(skb
);
680 tunnel
->err_count
= 0;
683 skb_scrub_packet(skb
, !net_eq(tunnel
->net
, dev_net(dev
)));
685 max_headroom
+= LL_RESERVED_SPACE(tdev
) + gre_hlen
+ dst
->header_len
;
687 if (skb_headroom(skb
) < max_headroom
|| skb_shared(skb
) ||
688 (skb_cloned(skb
) && !skb_clone_writable(skb
, 0))) {
689 new_skb
= skb_realloc_headroom(skb
, max_headroom
);
690 if (max_headroom
> dev
->needed_headroom
)
691 dev
->needed_headroom
= max_headroom
;
693 goto tx_err_dst_release
;
696 skb_set_owner_w(new_skb
, skb
->sk
);
701 if (fl6
->flowi6_mark
) {
702 skb_dst_set(skb
, dst
);
705 skb_dst_set_noref(skb
, dst
);
709 if (encap_limit
>= 0) {
710 init_tel_txopt(&opt
, encap_limit
);
711 ipv6_push_nfrag_opts(skb
, &opt
.ops
, &proto
, NULL
);
714 if (likely(!skb
->encapsulation
)) {
715 skb_reset_inner_headers(skb
);
716 skb
->encapsulation
= 1;
719 skb_push(skb
, gre_hlen
);
720 skb_reset_network_header(skb
);
721 skb_set_transport_header(skb
, sizeof(*ipv6h
));
724 * Push down and install the IP header.
726 ipv6h
= ipv6_hdr(skb
);
727 ip6_flow_hdr(ipv6h
, INET_ECN_encapsulate(0, dsfield
),
728 ip6_make_flowlabel(net
, skb
, fl6
->flowlabel
, false));
729 ipv6h
->hop_limit
= tunnel
->parms
.hop_limit
;
730 ipv6h
->nexthdr
= proto
;
731 ipv6h
->saddr
= fl6
->saddr
;
732 ipv6h
->daddr
= fl6
->daddr
;
734 ((__be16
*)(ipv6h
+ 1))[0] = tunnel
->parms
.o_flags
;
735 ((__be16
*)(ipv6h
+ 1))[1] = (dev
->type
== ARPHRD_ETHER
) ?
736 htons(ETH_P_TEB
) : skb
->protocol
;
738 if (tunnel
->parms
.o_flags
&(GRE_KEY
|GRE_CSUM
|GRE_SEQ
)) {
739 __be32
*ptr
= (__be32
*)(((u8
*)ipv6h
) + tunnel
->hlen
- 4);
741 if (tunnel
->parms
.o_flags
&GRE_SEQ
) {
743 *ptr
= htonl(tunnel
->o_seqno
);
746 if (tunnel
->parms
.o_flags
&GRE_KEY
) {
747 *ptr
= tunnel
->parms
.o_key
;
750 if (tunnel
->parms
.o_flags
&GRE_CSUM
) {
752 *(__sum16
*)ptr
= ip_compute_csum((void *)(ipv6h
+1),
753 skb
->len
- sizeof(struct ipv6hdr
));
757 ip6tunnel_xmit(skb
, dev
);
759 ip6_tnl_dst_store(tunnel
, ndst
);
762 stats
->tx_carrier_errors
++;
763 dst_link_failure(skb
);
769 static inline int ip6gre_xmit_ipv4(struct sk_buff
*skb
, struct net_device
*dev
)
771 struct ip6_tnl
*t
= netdev_priv(dev
);
772 const struct iphdr
*iph
= ip_hdr(skb
);
773 int encap_limit
= -1;
779 if (!(t
->parms
.flags
& IP6_TNL_F_IGN_ENCAP_LIMIT
))
780 encap_limit
= t
->parms
.encap_limit
;
782 memcpy(&fl6
, &t
->fl
.u
.ip6
, sizeof(fl6
));
783 fl6
.flowi6_proto
= IPPROTO_IPIP
;
785 dsfield
= ipv4_get_dsfield(iph
);
787 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_TCLASS
)
788 fl6
.flowlabel
|= htonl((__u32
)iph
->tos
<< IPV6_TCLASS_SHIFT
)
790 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_FWMARK
)
791 fl6
.flowi6_mark
= skb
->mark
;
793 err
= ip6gre_xmit2(skb
, dev
, dsfield
, &fl6
, encap_limit
, &mtu
);
795 /* XXX: send ICMP error even if DF is not set. */
796 if (err
== -EMSGSIZE
)
797 icmp_send(skb
, ICMP_DEST_UNREACH
, ICMP_FRAG_NEEDED
,
805 static inline int ip6gre_xmit_ipv6(struct sk_buff
*skb
, struct net_device
*dev
)
807 struct ip6_tnl
*t
= netdev_priv(dev
);
808 struct ipv6hdr
*ipv6h
= ipv6_hdr(skb
);
809 int encap_limit
= -1;
816 if (ipv6_addr_equal(&t
->parms
.raddr
, &ipv6h
->saddr
))
819 offset
= ip6_tnl_parse_tlv_enc_lim(skb
, skb_network_header(skb
));
821 struct ipv6_tlv_tnl_enc_lim
*tel
;
822 tel
= (struct ipv6_tlv_tnl_enc_lim
*)&skb_network_header(skb
)[offset
];
823 if (tel
->encap_limit
== 0) {
824 icmpv6_send(skb
, ICMPV6_PARAMPROB
,
825 ICMPV6_HDR_FIELD
, offset
+ 2);
828 encap_limit
= tel
->encap_limit
- 1;
829 } else if (!(t
->parms
.flags
& IP6_TNL_F_IGN_ENCAP_LIMIT
))
830 encap_limit
= t
->parms
.encap_limit
;
832 memcpy(&fl6
, &t
->fl
.u
.ip6
, sizeof(fl6
));
833 fl6
.flowi6_proto
= IPPROTO_IPV6
;
835 dsfield
= ipv6_get_dsfield(ipv6h
);
836 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_TCLASS
)
837 fl6
.flowlabel
|= (*(__be32
*) ipv6h
& IPV6_TCLASS_MASK
);
838 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_FLOWLABEL
)
839 fl6
.flowlabel
|= ip6_flowlabel(ipv6h
);
840 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_FWMARK
)
841 fl6
.flowi6_mark
= skb
->mark
;
843 err
= ip6gre_xmit2(skb
, dev
, dsfield
, &fl6
, encap_limit
, &mtu
);
845 if (err
== -EMSGSIZE
)
846 icmpv6_send(skb
, ICMPV6_PKT_TOOBIG
, 0, mtu
);
854 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
855 * @t: the outgoing tunnel device
856 * @hdr: IPv6 header from the incoming packet
859 * Avoid trivial tunneling loop by checking that tunnel exit-point
860 * doesn't match source of incoming packet.
867 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl
*t
,
868 const struct ipv6hdr
*hdr
)
870 return ipv6_addr_equal(&t
->parms
.raddr
, &hdr
->saddr
);
873 static int ip6gre_xmit_other(struct sk_buff
*skb
, struct net_device
*dev
)
875 struct ip6_tnl
*t
= netdev_priv(dev
);
876 int encap_limit
= -1;
881 if (!(t
->parms
.flags
& IP6_TNL_F_IGN_ENCAP_LIMIT
))
882 encap_limit
= t
->parms
.encap_limit
;
884 memcpy(&fl6
, &t
->fl
.u
.ip6
, sizeof(fl6
));
885 fl6
.flowi6_proto
= skb
->protocol
;
887 err
= ip6gre_xmit2(skb
, dev
, 0, &fl6
, encap_limit
, &mtu
);
892 static netdev_tx_t
ip6gre_tunnel_xmit(struct sk_buff
*skb
,
893 struct net_device
*dev
)
895 struct ip6_tnl
*t
= netdev_priv(dev
);
896 struct net_device_stats
*stats
= &t
->dev
->stats
;
899 if (!ip6_tnl_xmit_ctl(t
))
902 switch (skb
->protocol
) {
903 case htons(ETH_P_IP
):
904 ret
= ip6gre_xmit_ipv4(skb
, dev
);
906 case htons(ETH_P_IPV6
):
907 ret
= ip6gre_xmit_ipv6(skb
, dev
);
910 ret
= ip6gre_xmit_other(skb
, dev
);
926 static void ip6gre_tnl_link_config(struct ip6_tnl
*t
, int set_mtu
)
928 struct net_device
*dev
= t
->dev
;
929 struct __ip6_tnl_parm
*p
= &t
->parms
;
930 struct flowi6
*fl6
= &t
->fl
.u
.ip6
;
931 int addend
= sizeof(struct ipv6hdr
) + 4;
933 if (dev
->type
!= ARPHRD_ETHER
) {
934 memcpy(dev
->dev_addr
, &p
->laddr
, sizeof(struct in6_addr
));
935 memcpy(dev
->broadcast
, &p
->raddr
, sizeof(struct in6_addr
));
938 /* Set up flowi template */
939 fl6
->saddr
= p
->laddr
;
940 fl6
->daddr
= p
->raddr
;
941 fl6
->flowi6_oif
= p
->link
;
944 if (!(p
->flags
&IP6_TNL_F_USE_ORIG_TCLASS
))
945 fl6
->flowlabel
|= IPV6_TCLASS_MASK
& p
->flowinfo
;
946 if (!(p
->flags
&IP6_TNL_F_USE_ORIG_FLOWLABEL
))
947 fl6
->flowlabel
|= IPV6_FLOWLABEL_MASK
& p
->flowinfo
;
949 p
->flags
&= ~(IP6_TNL_F_CAP_XMIT
|IP6_TNL_F_CAP_RCV
|IP6_TNL_F_CAP_PER_PACKET
);
950 p
->flags
|= ip6_tnl_get_cap(t
, &p
->laddr
, &p
->raddr
);
952 if (p
->flags
&IP6_TNL_F_CAP_XMIT
&&
953 p
->flags
&IP6_TNL_F_CAP_RCV
&& dev
->type
!= ARPHRD_ETHER
)
954 dev
->flags
|= IFF_POINTOPOINT
;
956 dev
->flags
&= ~IFF_POINTOPOINT
;
958 dev
->iflink
= p
->link
;
960 /* Precalculate GRE options length */
961 if (t
->parms
.o_flags
&(GRE_CSUM
|GRE_KEY
|GRE_SEQ
)) {
962 if (t
->parms
.o_flags
&GRE_CSUM
)
964 if (t
->parms
.o_flags
&GRE_KEY
)
966 if (t
->parms
.o_flags
&GRE_SEQ
)
971 if (p
->flags
& IP6_TNL_F_CAP_XMIT
) {
972 int strict
= (ipv6_addr_type(&p
->raddr
) &
973 (IPV6_ADDR_MULTICAST
|IPV6_ADDR_LINKLOCAL
));
975 struct rt6_info
*rt
= rt6_lookup(t
->net
,
976 &p
->raddr
, &p
->laddr
,
983 dev
->hard_header_len
= rt
->dst
.dev
->hard_header_len
+ addend
;
986 dev
->mtu
= rt
->dst
.dev
->mtu
- addend
;
987 if (!(t
->parms
.flags
& IP6_TNL_F_IGN_ENCAP_LIMIT
))
990 if (dev
->mtu
< IPV6_MIN_MTU
)
991 dev
->mtu
= IPV6_MIN_MTU
;
998 static int ip6gre_tnl_change(struct ip6_tnl
*t
,
999 const struct __ip6_tnl_parm
*p
, int set_mtu
)
1001 t
->parms
.laddr
= p
->laddr
;
1002 t
->parms
.raddr
= p
->raddr
;
1003 t
->parms
.flags
= p
->flags
;
1004 t
->parms
.hop_limit
= p
->hop_limit
;
1005 t
->parms
.encap_limit
= p
->encap_limit
;
1006 t
->parms
.flowinfo
= p
->flowinfo
;
1007 t
->parms
.link
= p
->link
;
1008 t
->parms
.proto
= p
->proto
;
1009 t
->parms
.i_key
= p
->i_key
;
1010 t
->parms
.o_key
= p
->o_key
;
1011 t
->parms
.i_flags
= p
->i_flags
;
1012 t
->parms
.o_flags
= p
->o_flags
;
1013 ip6_tnl_dst_reset(t
);
1014 ip6gre_tnl_link_config(t
, set_mtu
);
1018 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm
*p
,
1019 const struct ip6_tnl_parm2
*u
)
1021 p
->laddr
= u
->laddr
;
1022 p
->raddr
= u
->raddr
;
1023 p
->flags
= u
->flags
;
1024 p
->hop_limit
= u
->hop_limit
;
1025 p
->encap_limit
= u
->encap_limit
;
1026 p
->flowinfo
= u
->flowinfo
;
1028 p
->i_key
= u
->i_key
;
1029 p
->o_key
= u
->o_key
;
1030 p
->i_flags
= u
->i_flags
;
1031 p
->o_flags
= u
->o_flags
;
1032 memcpy(p
->name
, u
->name
, sizeof(u
->name
));
1035 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2
*u
,
1036 const struct __ip6_tnl_parm
*p
)
1038 u
->proto
= IPPROTO_GRE
;
1039 u
->laddr
= p
->laddr
;
1040 u
->raddr
= p
->raddr
;
1041 u
->flags
= p
->flags
;
1042 u
->hop_limit
= p
->hop_limit
;
1043 u
->encap_limit
= p
->encap_limit
;
1044 u
->flowinfo
= p
->flowinfo
;
1046 u
->i_key
= p
->i_key
;
1047 u
->o_key
= p
->o_key
;
1048 u
->i_flags
= p
->i_flags
;
1049 u
->o_flags
= p
->o_flags
;
1050 memcpy(u
->name
, p
->name
, sizeof(u
->name
));
1053 static int ip6gre_tunnel_ioctl(struct net_device
*dev
,
1054 struct ifreq
*ifr
, int cmd
)
1057 struct ip6_tnl_parm2 p
;
1058 struct __ip6_tnl_parm p1
;
1059 struct ip6_tnl
*t
= netdev_priv(dev
);
1060 struct net
*net
= t
->net
;
1061 struct ip6gre_net
*ign
= net_generic(net
, ip6gre_net_id
);
1065 if (dev
== ign
->fb_tunnel_dev
) {
1066 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
))) {
1070 ip6gre_tnl_parm_from_user(&p1
, &p
);
1071 t
= ip6gre_tunnel_locate(net
, &p1
, 0);
1073 t
= netdev_priv(dev
);
1075 memset(&p
, 0, sizeof(p
));
1076 ip6gre_tnl_parm_to_user(&p
, &t
->parms
);
1077 if (copy_to_user(ifr
->ifr_ifru
.ifru_data
, &p
, sizeof(p
)))
1084 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
1088 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
)))
1092 if ((p
.i_flags
|p
.o_flags
)&(GRE_VERSION
|GRE_ROUTING
))
1095 if (!(p
.i_flags
&GRE_KEY
))
1097 if (!(p
.o_flags
&GRE_KEY
))
1100 ip6gre_tnl_parm_from_user(&p1
, &p
);
1101 t
= ip6gre_tunnel_locate(net
, &p1
, cmd
== SIOCADDTUNNEL
);
1103 if (dev
!= ign
->fb_tunnel_dev
&& cmd
== SIOCCHGTUNNEL
) {
1105 if (t
->dev
!= dev
) {
1110 t
= netdev_priv(dev
);
1112 ip6gre_tunnel_unlink(ign
, t
);
1114 ip6gre_tnl_change(t
, &p1
, 1);
1115 ip6gre_tunnel_link(ign
, t
);
1116 netdev_state_change(dev
);
1123 memset(&p
, 0, sizeof(p
));
1124 ip6gre_tnl_parm_to_user(&p
, &t
->parms
);
1125 if (copy_to_user(ifr
->ifr_ifru
.ifru_data
, &p
, sizeof(p
)))
1128 err
= (cmd
== SIOCADDTUNNEL
? -ENOBUFS
: -ENOENT
);
1133 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
1136 if (dev
== ign
->fb_tunnel_dev
) {
1138 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
)))
1141 ip6gre_tnl_parm_from_user(&p1
, &p
);
1142 t
= ip6gre_tunnel_locate(net
, &p1
, 0);
1146 if (t
== netdev_priv(ign
->fb_tunnel_dev
))
1150 unregister_netdevice(dev
);
1162 static int ip6gre_tunnel_change_mtu(struct net_device
*dev
, int new_mtu
)
1165 new_mtu
> 0xFFF8 - dev
->hard_header_len
)
1171 static int ip6gre_header(struct sk_buff
*skb
, struct net_device
*dev
,
1172 unsigned short type
,
1173 const void *daddr
, const void *saddr
, unsigned int len
)
1175 struct ip6_tnl
*t
= netdev_priv(dev
);
1176 struct ipv6hdr
*ipv6h
= (struct ipv6hdr
*)skb_push(skb
, t
->hlen
);
1177 __be16
*p
= (__be16
*)(ipv6h
+1);
1179 ip6_flow_hdr(ipv6h
, 0,
1180 ip6_make_flowlabel(dev_net(dev
), skb
,
1181 t
->fl
.u
.ip6
.flowlabel
, false));
1182 ipv6h
->hop_limit
= t
->parms
.hop_limit
;
1183 ipv6h
->nexthdr
= NEXTHDR_GRE
;
1184 ipv6h
->saddr
= t
->parms
.laddr
;
1185 ipv6h
->daddr
= t
->parms
.raddr
;
1187 p
[0] = t
->parms
.o_flags
;
1191 * Set the source hardware address.
1195 memcpy(&ipv6h
->saddr
, saddr
, sizeof(struct in6_addr
));
1197 memcpy(&ipv6h
->daddr
, daddr
, sizeof(struct in6_addr
));
1198 if (!ipv6_addr_any(&ipv6h
->daddr
))
1204 static const struct header_ops ip6gre_header_ops
= {
1205 .create
= ip6gre_header
,
1208 static const struct net_device_ops ip6gre_netdev_ops
= {
1209 .ndo_init
= ip6gre_tunnel_init
,
1210 .ndo_uninit
= ip6gre_tunnel_uninit
,
1211 .ndo_start_xmit
= ip6gre_tunnel_xmit
,
1212 .ndo_do_ioctl
= ip6gre_tunnel_ioctl
,
1213 .ndo_change_mtu
= ip6gre_tunnel_change_mtu
,
1214 .ndo_get_stats64
= ip_tunnel_get_stats64
,
1217 static void ip6gre_dev_free(struct net_device
*dev
)
1219 free_percpu(dev
->tstats
);
1223 static void ip6gre_tunnel_setup(struct net_device
*dev
)
1227 dev
->netdev_ops
= &ip6gre_netdev_ops
;
1228 dev
->destructor
= ip6gre_dev_free
;
1230 dev
->type
= ARPHRD_IP6GRE
;
1231 dev
->hard_header_len
= LL_MAX_HEADER
+ sizeof(struct ipv6hdr
) + 4;
1232 dev
->mtu
= ETH_DATA_LEN
- sizeof(struct ipv6hdr
) - 4;
1233 t
= netdev_priv(dev
);
1234 if (!(t
->parms
.flags
& IP6_TNL_F_IGN_ENCAP_LIMIT
))
1236 dev
->flags
|= IFF_NOARP
;
1238 dev
->addr_len
= sizeof(struct in6_addr
);
1239 dev
->priv_flags
&= ~IFF_XMIT_DST_RELEASE
;
1242 static int ip6gre_tunnel_init(struct net_device
*dev
)
1244 struct ip6_tnl
*tunnel
;
1247 tunnel
= netdev_priv(dev
);
1250 tunnel
->net
= dev_net(dev
);
1251 strcpy(tunnel
->parms
.name
, dev
->name
);
1253 memcpy(dev
->dev_addr
, &tunnel
->parms
.laddr
, sizeof(struct in6_addr
));
1254 memcpy(dev
->broadcast
, &tunnel
->parms
.raddr
, sizeof(struct in6_addr
));
1256 if (ipv6_addr_any(&tunnel
->parms
.raddr
))
1257 dev
->header_ops
= &ip6gre_header_ops
;
1259 dev
->tstats
= alloc_percpu(struct pcpu_sw_netstats
);
1263 for_each_possible_cpu(i
) {
1264 struct pcpu_sw_netstats
*ip6gre_tunnel_stats
;
1265 ip6gre_tunnel_stats
= per_cpu_ptr(dev
->tstats
, i
);
1266 u64_stats_init(&ip6gre_tunnel_stats
->syncp
);
1273 static void ip6gre_fb_tunnel_init(struct net_device
*dev
)
1275 struct ip6_tnl
*tunnel
= netdev_priv(dev
);
1278 tunnel
->net
= dev_net(dev
);
1279 strcpy(tunnel
->parms
.name
, dev
->name
);
1281 tunnel
->hlen
= sizeof(struct ipv6hdr
) + 4;
1287 static struct inet6_protocol ip6gre_protocol __read_mostly
= {
1288 .handler
= ip6gre_rcv
,
1289 .err_handler
= ip6gre_err
,
1290 .flags
= INET6_PROTO_NOPOLICY
|INET6_PROTO_FINAL
,
1293 static void ip6gre_destroy_tunnels(struct net
*net
, struct list_head
*head
)
1295 struct ip6gre_net
*ign
= net_generic(net
, ip6gre_net_id
);
1296 struct net_device
*dev
, *aux
;
1299 for_each_netdev_safe(net
, dev
, aux
)
1300 if (dev
->rtnl_link_ops
== &ip6gre_link_ops
||
1301 dev
->rtnl_link_ops
== &ip6gre_tap_ops
)
1302 unregister_netdevice_queue(dev
, head
);
1304 for (prio
= 0; prio
< 4; prio
++) {
1306 for (h
= 0; h
< HASH_SIZE
; h
++) {
1309 t
= rtnl_dereference(ign
->tunnels
[prio
][h
]);
1312 /* If dev is in the same netns, it has already
1313 * been added to the list by the previous loop.
1315 if (!net_eq(dev_net(t
->dev
), net
))
1316 unregister_netdevice_queue(t
->dev
,
1318 t
= rtnl_dereference(t
->next
);
1324 static int __net_init
ip6gre_init_net(struct net
*net
)
1326 struct ip6gre_net
*ign
= net_generic(net
, ip6gre_net_id
);
1329 ign
->fb_tunnel_dev
= alloc_netdev(sizeof(struct ip6_tnl
), "ip6gre0",
1331 ip6gre_tunnel_setup
);
1332 if (!ign
->fb_tunnel_dev
) {
1336 dev_net_set(ign
->fb_tunnel_dev
, net
);
1337 /* FB netdevice is special: we have one, and only one per netns.
1338 * Allowing to move it to another netns is clearly unsafe.
1340 ign
->fb_tunnel_dev
->features
|= NETIF_F_NETNS_LOCAL
;
1343 ip6gre_fb_tunnel_init(ign
->fb_tunnel_dev
);
1344 ign
->fb_tunnel_dev
->rtnl_link_ops
= &ip6gre_link_ops
;
1346 err
= register_netdev(ign
->fb_tunnel_dev
);
1350 rcu_assign_pointer(ign
->tunnels_wc
[0],
1351 netdev_priv(ign
->fb_tunnel_dev
));
1355 ip6gre_dev_free(ign
->fb_tunnel_dev
);
1360 static void __net_exit
ip6gre_exit_net(struct net
*net
)
1365 ip6gre_destroy_tunnels(net
, &list
);
1366 unregister_netdevice_many(&list
);
1370 static struct pernet_operations ip6gre_net_ops
= {
1371 .init
= ip6gre_init_net
,
1372 .exit
= ip6gre_exit_net
,
1373 .id
= &ip6gre_net_id
,
1374 .size
= sizeof(struct ip6gre_net
),
1377 static int ip6gre_tunnel_validate(struct nlattr
*tb
[], struct nlattr
*data
[])
1385 if (data
[IFLA_GRE_IFLAGS
])
1386 flags
|= nla_get_be16(data
[IFLA_GRE_IFLAGS
]);
1387 if (data
[IFLA_GRE_OFLAGS
])
1388 flags
|= nla_get_be16(data
[IFLA_GRE_OFLAGS
]);
1389 if (flags
& (GRE_VERSION
|GRE_ROUTING
))
1395 static int ip6gre_tap_validate(struct nlattr
*tb
[], struct nlattr
*data
[])
1397 struct in6_addr daddr
;
1399 if (tb
[IFLA_ADDRESS
]) {
1400 if (nla_len(tb
[IFLA_ADDRESS
]) != ETH_ALEN
)
1402 if (!is_valid_ether_addr(nla_data(tb
[IFLA_ADDRESS
])))
1403 return -EADDRNOTAVAIL
;
1409 if (data
[IFLA_GRE_REMOTE
]) {
1410 nla_memcpy(&daddr
, data
[IFLA_GRE_REMOTE
], sizeof(struct in6_addr
));
1411 if (ipv6_addr_any(&daddr
))
1416 return ip6gre_tunnel_validate(tb
, data
);
1420 static void ip6gre_netlink_parms(struct nlattr
*data
[],
1421 struct __ip6_tnl_parm
*parms
)
1423 memset(parms
, 0, sizeof(*parms
));
1428 if (data
[IFLA_GRE_LINK
])
1429 parms
->link
= nla_get_u32(data
[IFLA_GRE_LINK
]);
1431 if (data
[IFLA_GRE_IFLAGS
])
1432 parms
->i_flags
= nla_get_be16(data
[IFLA_GRE_IFLAGS
]);
1434 if (data
[IFLA_GRE_OFLAGS
])
1435 parms
->o_flags
= nla_get_be16(data
[IFLA_GRE_OFLAGS
]);
1437 if (data
[IFLA_GRE_IKEY
])
1438 parms
->i_key
= nla_get_be32(data
[IFLA_GRE_IKEY
]);
1440 if (data
[IFLA_GRE_OKEY
])
1441 parms
->o_key
= nla_get_be32(data
[IFLA_GRE_OKEY
]);
1443 if (data
[IFLA_GRE_LOCAL
])
1444 nla_memcpy(&parms
->laddr
, data
[IFLA_GRE_LOCAL
], sizeof(struct in6_addr
));
1446 if (data
[IFLA_GRE_REMOTE
])
1447 nla_memcpy(&parms
->raddr
, data
[IFLA_GRE_REMOTE
], sizeof(struct in6_addr
));
1449 if (data
[IFLA_GRE_TTL
])
1450 parms
->hop_limit
= nla_get_u8(data
[IFLA_GRE_TTL
]);
1452 if (data
[IFLA_GRE_ENCAP_LIMIT
])
1453 parms
->encap_limit
= nla_get_u8(data
[IFLA_GRE_ENCAP_LIMIT
]);
1455 if (data
[IFLA_GRE_FLOWINFO
])
1456 parms
->flowinfo
= nla_get_u32(data
[IFLA_GRE_FLOWINFO
]);
1458 if (data
[IFLA_GRE_FLAGS
])
1459 parms
->flags
= nla_get_u32(data
[IFLA_GRE_FLAGS
]);
1462 static int ip6gre_tap_init(struct net_device
*dev
)
1464 struct ip6_tnl
*tunnel
;
1466 tunnel
= netdev_priv(dev
);
1469 tunnel
->net
= dev_net(dev
);
1470 strcpy(tunnel
->parms
.name
, dev
->name
);
1472 ip6gre_tnl_link_config(tunnel
, 1);
1474 dev
->tstats
= netdev_alloc_pcpu_stats(struct pcpu_sw_netstats
);
1481 static const struct net_device_ops ip6gre_tap_netdev_ops
= {
1482 .ndo_init
= ip6gre_tap_init
,
1483 .ndo_uninit
= ip6gre_tunnel_uninit
,
1484 .ndo_start_xmit
= ip6gre_tunnel_xmit
,
1485 .ndo_set_mac_address
= eth_mac_addr
,
1486 .ndo_validate_addr
= eth_validate_addr
,
1487 .ndo_change_mtu
= ip6gre_tunnel_change_mtu
,
1488 .ndo_get_stats64
= ip_tunnel_get_stats64
,
1491 static void ip6gre_tap_setup(struct net_device
*dev
)
1496 dev
->netdev_ops
= &ip6gre_tap_netdev_ops
;
1497 dev
->destructor
= ip6gre_dev_free
;
1500 dev
->features
|= NETIF_F_NETNS_LOCAL
;
1503 static int ip6gre_newlink(struct net
*src_net
, struct net_device
*dev
,
1504 struct nlattr
*tb
[], struct nlattr
*data
[])
1507 struct net
*net
= dev_net(dev
);
1508 struct ip6gre_net
*ign
= net_generic(net
, ip6gre_net_id
);
1511 nt
= netdev_priv(dev
);
1512 ip6gre_netlink_parms(data
, &nt
->parms
);
1514 if (ip6gre_tunnel_find(net
, &nt
->parms
, dev
->type
))
1517 if (dev
->type
== ARPHRD_ETHER
&& !tb
[IFLA_ADDRESS
])
1518 eth_hw_addr_random(dev
);
1521 nt
->net
= dev_net(dev
);
1522 ip6gre_tnl_link_config(nt
, !tb
[IFLA_MTU
]);
1524 /* Can use a lockless transmit, unless we generate output sequences */
1525 if (!(nt
->parms
.o_flags
& GRE_SEQ
))
1526 dev
->features
|= NETIF_F_LLTX
;
1528 err
= register_netdevice(dev
);
1533 ip6gre_tunnel_link(ign
, nt
);
1539 static int ip6gre_changelink(struct net_device
*dev
, struct nlattr
*tb
[],
1540 struct nlattr
*data
[])
1542 struct ip6_tnl
*t
, *nt
= netdev_priv(dev
);
1543 struct net
*net
= nt
->net
;
1544 struct ip6gre_net
*ign
= net_generic(net
, ip6gre_net_id
);
1545 struct __ip6_tnl_parm p
;
1547 if (dev
== ign
->fb_tunnel_dev
)
1550 ip6gre_netlink_parms(data
, &p
);
1552 t
= ip6gre_tunnel_locate(net
, &p
, 0);
1560 ip6gre_tunnel_unlink(ign
, t
);
1561 ip6gre_tnl_change(t
, &p
, !tb
[IFLA_MTU
]);
1562 ip6gre_tunnel_link(ign
, t
);
1563 netdev_state_change(dev
);
1569 static void ip6gre_dellink(struct net_device
*dev
, struct list_head
*head
)
1571 struct net
*net
= dev_net(dev
);
1572 struct ip6gre_net
*ign
= net_generic(net
, ip6gre_net_id
);
1574 if (dev
!= ign
->fb_tunnel_dev
)
1575 unregister_netdevice_queue(dev
, head
);
1578 static size_t ip6gre_get_size(const struct net_device
*dev
)
1583 /* IFLA_GRE_IFLAGS */
1585 /* IFLA_GRE_OFLAGS */
1591 /* IFLA_GRE_LOCAL */
1592 nla_total_size(sizeof(struct in6_addr
)) +
1593 /* IFLA_GRE_REMOTE */
1594 nla_total_size(sizeof(struct in6_addr
)) +
1599 /* IFLA_GRE_ENCAP_LIMIT */
1601 /* IFLA_GRE_FLOWINFO */
1603 /* IFLA_GRE_FLAGS */
1608 static int ip6gre_fill_info(struct sk_buff
*skb
, const struct net_device
*dev
)
1610 struct ip6_tnl
*t
= netdev_priv(dev
);
1611 struct __ip6_tnl_parm
*p
= &t
->parms
;
1613 if (nla_put_u32(skb
, IFLA_GRE_LINK
, p
->link
) ||
1614 nla_put_be16(skb
, IFLA_GRE_IFLAGS
, p
->i_flags
) ||
1615 nla_put_be16(skb
, IFLA_GRE_OFLAGS
, p
->o_flags
) ||
1616 nla_put_be32(skb
, IFLA_GRE_IKEY
, p
->i_key
) ||
1617 nla_put_be32(skb
, IFLA_GRE_OKEY
, p
->o_key
) ||
1618 nla_put(skb
, IFLA_GRE_LOCAL
, sizeof(struct in6_addr
), &p
->laddr
) ||
1619 nla_put(skb
, IFLA_GRE_REMOTE
, sizeof(struct in6_addr
), &p
->raddr
) ||
1620 nla_put_u8(skb
, IFLA_GRE_TTL
, p
->hop_limit
) ||
1621 /*nla_put_u8(skb, IFLA_GRE_TOS, t->priority) ||*/
1622 nla_put_u8(skb
, IFLA_GRE_ENCAP_LIMIT
, p
->encap_limit
) ||
1623 nla_put_be32(skb
, IFLA_GRE_FLOWINFO
, p
->flowinfo
) ||
1624 nla_put_u32(skb
, IFLA_GRE_FLAGS
, p
->flags
))
1625 goto nla_put_failure
;
1632 static const struct nla_policy ip6gre_policy
[IFLA_GRE_MAX
+ 1] = {
1633 [IFLA_GRE_LINK
] = { .type
= NLA_U32
},
1634 [IFLA_GRE_IFLAGS
] = { .type
= NLA_U16
},
1635 [IFLA_GRE_OFLAGS
] = { .type
= NLA_U16
},
1636 [IFLA_GRE_IKEY
] = { .type
= NLA_U32
},
1637 [IFLA_GRE_OKEY
] = { .type
= NLA_U32
},
1638 [IFLA_GRE_LOCAL
] = { .len
= FIELD_SIZEOF(struct ipv6hdr
, saddr
) },
1639 [IFLA_GRE_REMOTE
] = { .len
= FIELD_SIZEOF(struct ipv6hdr
, daddr
) },
1640 [IFLA_GRE_TTL
] = { .type
= NLA_U8
},
1641 [IFLA_GRE_ENCAP_LIMIT
] = { .type
= NLA_U8
},
1642 [IFLA_GRE_FLOWINFO
] = { .type
= NLA_U32
},
1643 [IFLA_GRE_FLAGS
] = { .type
= NLA_U32
},
1646 static struct rtnl_link_ops ip6gre_link_ops __read_mostly
= {
1648 .maxtype
= IFLA_GRE_MAX
,
1649 .policy
= ip6gre_policy
,
1650 .priv_size
= sizeof(struct ip6_tnl
),
1651 .setup
= ip6gre_tunnel_setup
,
1652 .validate
= ip6gre_tunnel_validate
,
1653 .newlink
= ip6gre_newlink
,
1654 .changelink
= ip6gre_changelink
,
1655 .dellink
= ip6gre_dellink
,
1656 .get_size
= ip6gre_get_size
,
1657 .fill_info
= ip6gre_fill_info
,
1660 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly
= {
1661 .kind
= "ip6gretap",
1662 .maxtype
= IFLA_GRE_MAX
,
1663 .policy
= ip6gre_policy
,
1664 .priv_size
= sizeof(struct ip6_tnl
),
1665 .setup
= ip6gre_tap_setup
,
1666 .validate
= ip6gre_tap_validate
,
1667 .newlink
= ip6gre_newlink
,
1668 .changelink
= ip6gre_changelink
,
1669 .get_size
= ip6gre_get_size
,
1670 .fill_info
= ip6gre_fill_info
,
1674 * And now the modules code and kernel interface.
1677 static int __init
ip6gre_init(void)
1681 pr_info("GRE over IPv6 tunneling driver\n");
1683 err
= register_pernet_device(&ip6gre_net_ops
);
1687 err
= inet6_add_protocol(&ip6gre_protocol
, IPPROTO_GRE
);
1689 pr_info("%s: can't add protocol\n", __func__
);
1690 goto add_proto_failed
;
1693 err
= rtnl_link_register(&ip6gre_link_ops
);
1695 goto rtnl_link_failed
;
1697 err
= rtnl_link_register(&ip6gre_tap_ops
);
1699 goto tap_ops_failed
;
1705 rtnl_link_unregister(&ip6gre_link_ops
);
1707 inet6_del_protocol(&ip6gre_protocol
, IPPROTO_GRE
);
1709 unregister_pernet_device(&ip6gre_net_ops
);
1713 static void __exit
ip6gre_fini(void)
1715 rtnl_link_unregister(&ip6gre_tap_ops
);
1716 rtnl_link_unregister(&ip6gre_link_ops
);
1717 inet6_del_protocol(&ip6gre_protocol
, IPPROTO_GRE
);
1718 unregister_pernet_device(&ip6gre_net_ops
);
1721 module_init(ip6gre_init
);
1722 module_exit(ip6gre_fini
);
1723 MODULE_LICENSE("GPL");
1724 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1725 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1726 MODULE_ALIAS_RTNL_LINK("ip6gre");
1727 MODULE_ALIAS_NETDEV("ip6gre0");