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/init.h>
28 #include <linux/in6.h>
29 #include <linux/inetdevice.h>
30 #include <linux/igmp.h>
31 #include <linux/netfilter_ipv4.h>
32 #include <linux/etherdevice.h>
33 #include <linux/if_ether.h>
34 #include <linux/hash.h>
35 #include <linux/if_tunnel.h>
36 #include <linux/ip6_tunnel.h>
40 #include <net/ip_tunnels.h>
42 #include <net/protocol.h>
43 #include <net/addrconf.h>
45 #include <net/checksum.h>
46 #include <net/dsfield.h>
47 #include <net/inet_ecn.h>
49 #include <net/net_namespace.h>
50 #include <net/netns/generic.h>
51 #include <net/rtnetlink.h>
54 #include <net/ip6_fib.h>
55 #include <net/ip6_route.h>
56 #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 IP6_GRE_HASH_SIZE_SHIFT 5
65 #define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT)
67 static unsigned int ip6gre_net_id __read_mostly
;
69 struct ip6_tnl __rcu
*tunnels
[4][IP6_GRE_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))&(IP6_GRE_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
, IP6_GRE_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
);
323 strlcpy(name
, parms
->name
, IFNAMSIZ
);
325 strcpy(name
, "ip6gre%d");
327 dev
= alloc_netdev(sizeof(*t
), name
, NET_NAME_UNKNOWN
,
328 ip6gre_tunnel_setup
);
332 dev_net_set(dev
, net
);
334 nt
= netdev_priv(dev
);
336 dev
->rtnl_link_ops
= &ip6gre_link_ops
;
339 nt
->net
= dev_net(dev
);
340 ip6gre_tnl_link_config(nt
, 1);
342 if (register_netdevice(dev
) < 0)
345 /* Can use a lockless transmit, unless we generate output sequences */
346 if (!(nt
->parms
.o_flags
& TUNNEL_SEQ
))
347 dev
->features
|= NETIF_F_LLTX
;
350 ip6gre_tunnel_link(ign
, nt
);
358 static void ip6gre_tunnel_uninit(struct net_device
*dev
)
360 struct ip6_tnl
*t
= netdev_priv(dev
);
361 struct ip6gre_net
*ign
= net_generic(t
->net
, ip6gre_net_id
);
363 ip6gre_tunnel_unlink(ign
, t
);
364 dst_cache_reset(&t
->dst_cache
);
369 static void ip6gre_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
370 u8 type
, u8 code
, int offset
, __be32 info
)
372 const struct gre_base_hdr
*greh
;
373 const struct ipv6hdr
*ipv6h
;
374 int grehlen
= sizeof(*greh
);
380 if (!pskb_may_pull(skb
, offset
+ grehlen
))
382 greh
= (const struct gre_base_hdr
*)(skb
->data
+ offset
);
384 if (flags
& (GRE_VERSION
| GRE_ROUTING
))
386 if (flags
& GRE_CSUM
)
388 if (flags
& GRE_KEY
) {
389 key_off
= grehlen
+ offset
;
393 if (!pskb_may_pull(skb
, offset
+ grehlen
))
395 ipv6h
= (const struct ipv6hdr
*)skb
->data
;
396 greh
= (const struct gre_base_hdr
*)(skb
->data
+ offset
);
397 key
= key_off
? *(__be32
*)(skb
->data
+ key_off
) : 0;
399 t
= ip6gre_tunnel_lookup(skb
->dev
, &ipv6h
->daddr
, &ipv6h
->saddr
,
400 key
, greh
->protocol
);
406 struct ipv6_tlv_tnl_enc_lim
*tel
;
408 case ICMPV6_DEST_UNREACH
:
409 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
412 case ICMPV6_TIME_EXCEED
:
413 if (code
== ICMPV6_EXC_HOPLIMIT
) {
414 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
418 case ICMPV6_PARAMPROB
:
420 if (code
== ICMPV6_HDR_FIELD
)
421 teli
= ip6_tnl_parse_tlv_enc_lim(skb
, skb
->data
);
423 if (teli
&& teli
== be32_to_cpu(info
) - 2) {
424 tel
= (struct ipv6_tlv_tnl_enc_lim
*) &skb
->data
[teli
];
425 if (tel
->encap_limit
== 0) {
426 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
430 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
434 case ICMPV6_PKT_TOOBIG
:
435 mtu
= be32_to_cpu(info
) - offset
;
436 if (mtu
< IPV6_MIN_MTU
)
442 if (time_before(jiffies
, t
->err_time
+ IP6TUNNEL_ERR_TIMEO
))
446 t
->err_time
= jiffies
;
449 static int ip6gre_rcv(struct sk_buff
*skb
, const struct tnl_ptk_info
*tpi
)
451 const struct ipv6hdr
*ipv6h
;
452 struct ip6_tnl
*tunnel
;
454 ipv6h
= ipv6_hdr(skb
);
455 tunnel
= ip6gre_tunnel_lookup(skb
->dev
,
456 &ipv6h
->saddr
, &ipv6h
->daddr
, tpi
->key
,
459 ip6_tnl_rcv(tunnel
, skb
, tpi
, NULL
, false);
464 return PACKET_REJECT
;
467 static int gre_rcv(struct sk_buff
*skb
)
469 struct tnl_ptk_info tpi
;
470 bool csum_err
= false;
473 hdr_len
= gre_parse_header(skb
, &tpi
, &csum_err
, htons(ETH_P_IPV6
), 0);
477 if (iptunnel_pull_header(skb
, hdr_len
, tpi
.proto
, false))
480 if (ip6gre_rcv(skb
, &tpi
) == PACKET_RCVD
)
483 icmpv6_send(skb
, ICMPV6_DEST_UNREACH
, ICMPV6_PORT_UNREACH
, 0);
489 static int gre_handle_offloads(struct sk_buff
*skb
, bool csum
)
491 return iptunnel_handle_offloads(skb
,
492 csum
? SKB_GSO_GRE_CSUM
: SKB_GSO_GRE
);
495 static netdev_tx_t
__gre6_xmit(struct sk_buff
*skb
,
496 struct net_device
*dev
, __u8 dsfield
,
497 struct flowi6
*fl6
, int encap_limit
,
498 __u32
*pmtu
, __be16 proto
)
500 struct ip6_tnl
*tunnel
= netdev_priv(dev
);
501 __be16 protocol
= (dev
->type
== ARPHRD_ETHER
) ?
502 htons(ETH_P_TEB
) : proto
;
504 if (dev
->type
== ARPHRD_ETHER
)
505 IPCB(skb
)->flags
= 0;
507 if (dev
->header_ops
&& dev
->type
== ARPHRD_IP6GRE
)
508 fl6
->daddr
= ((struct ipv6hdr
*)skb
->data
)->daddr
;
510 fl6
->daddr
= tunnel
->parms
.raddr
;
512 if (tunnel
->parms
.o_flags
& TUNNEL_SEQ
)
515 /* Push GRE header. */
516 gre_build_header(skb
, tunnel
->tun_hlen
, tunnel
->parms
.o_flags
,
517 protocol
, tunnel
->parms
.o_key
, htonl(tunnel
->o_seqno
));
519 return ip6_tnl_xmit(skb
, dev
, dsfield
, fl6
, encap_limit
, pmtu
,
523 static inline int ip6gre_xmit_ipv4(struct sk_buff
*skb
, struct net_device
*dev
)
525 struct ip6_tnl
*t
= netdev_priv(dev
);
526 const struct iphdr
*iph
= ip_hdr(skb
);
527 int encap_limit
= -1;
533 memset(&(IPCB(skb
)->opt
), 0, sizeof(IPCB(skb
)->opt
));
535 if (!(t
->parms
.flags
& IP6_TNL_F_IGN_ENCAP_LIMIT
))
536 encap_limit
= t
->parms
.encap_limit
;
538 memcpy(&fl6
, &t
->fl
.u
.ip6
, sizeof(fl6
));
540 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_TCLASS
)
541 dsfield
= ipv4_get_dsfield(iph
);
543 dsfield
= ip6_tclass(t
->parms
.flowinfo
);
544 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_FWMARK
)
545 fl6
.flowi6_mark
= skb
->mark
;
547 fl6
.flowi6_mark
= t
->parms
.fwmark
;
549 fl6
.flowi6_uid
= sock_net_uid(dev_net(dev
), NULL
);
551 err
= gre_handle_offloads(skb
, !!(t
->parms
.o_flags
& TUNNEL_CSUM
));
555 err
= __gre6_xmit(skb
, dev
, dsfield
, &fl6
, encap_limit
, &mtu
,
558 /* XXX: send ICMP error even if DF is not set. */
559 if (err
== -EMSGSIZE
)
560 icmp_send(skb
, ICMP_DEST_UNREACH
, ICMP_FRAG_NEEDED
,
568 static inline int ip6gre_xmit_ipv6(struct sk_buff
*skb
, struct net_device
*dev
)
570 struct ip6_tnl
*t
= netdev_priv(dev
);
571 struct ipv6hdr
*ipv6h
= ipv6_hdr(skb
);
572 int encap_limit
= -1;
579 if (ipv6_addr_equal(&t
->parms
.raddr
, &ipv6h
->saddr
))
582 offset
= ip6_tnl_parse_tlv_enc_lim(skb
, skb_network_header(skb
));
583 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
584 ipv6h
= ipv6_hdr(skb
);
587 struct ipv6_tlv_tnl_enc_lim
*tel
;
588 tel
= (struct ipv6_tlv_tnl_enc_lim
*)&skb_network_header(skb
)[offset
];
589 if (tel
->encap_limit
== 0) {
590 icmpv6_send(skb
, ICMPV6_PARAMPROB
,
591 ICMPV6_HDR_FIELD
, offset
+ 2);
594 encap_limit
= tel
->encap_limit
- 1;
595 } else if (!(t
->parms
.flags
& IP6_TNL_F_IGN_ENCAP_LIMIT
))
596 encap_limit
= t
->parms
.encap_limit
;
598 memcpy(&fl6
, &t
->fl
.u
.ip6
, sizeof(fl6
));
600 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_TCLASS
)
601 dsfield
= ipv6_get_dsfield(ipv6h
);
603 dsfield
= ip6_tclass(t
->parms
.flowinfo
);
605 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_FLOWLABEL
)
606 fl6
.flowlabel
|= ip6_flowlabel(ipv6h
);
607 if (t
->parms
.flags
& IP6_TNL_F_USE_ORIG_FWMARK
)
608 fl6
.flowi6_mark
= skb
->mark
;
610 fl6
.flowi6_mark
= t
->parms
.fwmark
;
612 fl6
.flowi6_uid
= sock_net_uid(dev_net(dev
), NULL
);
614 if (gre_handle_offloads(skb
, !!(t
->parms
.o_flags
& TUNNEL_CSUM
)))
617 err
= __gre6_xmit(skb
, dev
, dsfield
, &fl6
, encap_limit
,
618 &mtu
, skb
->protocol
);
620 if (err
== -EMSGSIZE
)
621 icmpv6_send(skb
, ICMPV6_PKT_TOOBIG
, 0, mtu
);
629 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
630 * @t: the outgoing tunnel device
631 * @hdr: IPv6 header from the incoming packet
634 * Avoid trivial tunneling loop by checking that tunnel exit-point
635 * doesn't match source of incoming packet.
642 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl
*t
,
643 const struct ipv6hdr
*hdr
)
645 return ipv6_addr_equal(&t
->parms
.raddr
, &hdr
->saddr
);
648 static int ip6gre_xmit_other(struct sk_buff
*skb
, struct net_device
*dev
)
650 struct ip6_tnl
*t
= netdev_priv(dev
);
651 int encap_limit
= -1;
656 if (!(t
->parms
.flags
& IP6_TNL_F_IGN_ENCAP_LIMIT
))
657 encap_limit
= t
->parms
.encap_limit
;
659 memcpy(&fl6
, &t
->fl
.u
.ip6
, sizeof(fl6
));
661 err
= gre_handle_offloads(skb
, !!(t
->parms
.o_flags
& TUNNEL_CSUM
));
665 err
= __gre6_xmit(skb
, dev
, 0, &fl6
, encap_limit
, &mtu
, skb
->protocol
);
670 static netdev_tx_t
ip6gre_tunnel_xmit(struct sk_buff
*skb
,
671 struct net_device
*dev
)
673 struct ip6_tnl
*t
= netdev_priv(dev
);
674 struct net_device_stats
*stats
= &t
->dev
->stats
;
677 if (!ip6_tnl_xmit_ctl(t
, &t
->parms
.laddr
, &t
->parms
.raddr
))
680 switch (skb
->protocol
) {
681 case htons(ETH_P_IP
):
682 ret
= ip6gre_xmit_ipv4(skb
, dev
);
684 case htons(ETH_P_IPV6
):
685 ret
= ip6gre_xmit_ipv6(skb
, dev
);
688 ret
= ip6gre_xmit_other(skb
, dev
);
704 static void ip6gre_tnl_link_config(struct ip6_tnl
*t
, int set_mtu
)
706 struct net_device
*dev
= t
->dev
;
707 struct __ip6_tnl_parm
*p
= &t
->parms
;
708 struct flowi6
*fl6
= &t
->fl
.u
.ip6
;
711 if (dev
->type
!= ARPHRD_ETHER
) {
712 memcpy(dev
->dev_addr
, &p
->laddr
, sizeof(struct in6_addr
));
713 memcpy(dev
->broadcast
, &p
->raddr
, sizeof(struct in6_addr
));
716 /* Set up flowi template */
717 fl6
->saddr
= p
->laddr
;
718 fl6
->daddr
= p
->raddr
;
719 fl6
->flowi6_oif
= p
->link
;
721 fl6
->flowi6_proto
= IPPROTO_GRE
;
723 if (!(p
->flags
&IP6_TNL_F_USE_ORIG_TCLASS
))
724 fl6
->flowlabel
|= IPV6_TCLASS_MASK
& p
->flowinfo
;
725 if (!(p
->flags
&IP6_TNL_F_USE_ORIG_FLOWLABEL
))
726 fl6
->flowlabel
|= IPV6_FLOWLABEL_MASK
& p
->flowinfo
;
728 p
->flags
&= ~(IP6_TNL_F_CAP_XMIT
|IP6_TNL_F_CAP_RCV
|IP6_TNL_F_CAP_PER_PACKET
);
729 p
->flags
|= ip6_tnl_get_cap(t
, &p
->laddr
, &p
->raddr
);
731 if (p
->flags
&IP6_TNL_F_CAP_XMIT
&&
732 p
->flags
&IP6_TNL_F_CAP_RCV
&& dev
->type
!= ARPHRD_ETHER
)
733 dev
->flags
|= IFF_POINTOPOINT
;
735 dev
->flags
&= ~IFF_POINTOPOINT
;
737 t
->tun_hlen
= gre_calc_hlen(t
->parms
.o_flags
);
739 t
->hlen
= t
->encap_hlen
+ t
->tun_hlen
;
741 t_hlen
= t
->hlen
+ sizeof(struct ipv6hdr
);
743 if (p
->flags
& IP6_TNL_F_CAP_XMIT
) {
744 int strict
= (ipv6_addr_type(&p
->raddr
) &
745 (IPV6_ADDR_MULTICAST
|IPV6_ADDR_LINKLOCAL
));
747 struct rt6_info
*rt
= rt6_lookup(t
->net
,
748 &p
->raddr
, &p
->laddr
,
755 dev
->hard_header_len
= rt
->dst
.dev
->hard_header_len
+
759 dev
->mtu
= rt
->dst
.dev
->mtu
- t_hlen
;
760 if (!(t
->parms
.flags
& IP6_TNL_F_IGN_ENCAP_LIMIT
))
762 if (dev
->type
== ARPHRD_ETHER
)
763 dev
->mtu
-= ETH_HLEN
;
765 if (dev
->mtu
< IPV6_MIN_MTU
)
766 dev
->mtu
= IPV6_MIN_MTU
;
773 static int ip6gre_tnl_change(struct ip6_tnl
*t
,
774 const struct __ip6_tnl_parm
*p
, int set_mtu
)
776 t
->parms
.laddr
= p
->laddr
;
777 t
->parms
.raddr
= p
->raddr
;
778 t
->parms
.flags
= p
->flags
;
779 t
->parms
.hop_limit
= p
->hop_limit
;
780 t
->parms
.encap_limit
= p
->encap_limit
;
781 t
->parms
.flowinfo
= p
->flowinfo
;
782 t
->parms
.link
= p
->link
;
783 t
->parms
.proto
= p
->proto
;
784 t
->parms
.i_key
= p
->i_key
;
785 t
->parms
.o_key
= p
->o_key
;
786 t
->parms
.i_flags
= p
->i_flags
;
787 t
->parms
.o_flags
= p
->o_flags
;
788 t
->parms
.fwmark
= p
->fwmark
;
789 dst_cache_reset(&t
->dst_cache
);
790 ip6gre_tnl_link_config(t
, set_mtu
);
794 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm
*p
,
795 const struct ip6_tnl_parm2
*u
)
800 p
->hop_limit
= u
->hop_limit
;
801 p
->encap_limit
= u
->encap_limit
;
802 p
->flowinfo
= u
->flowinfo
;
806 p
->i_flags
= gre_flags_to_tnl_flags(u
->i_flags
);
807 p
->o_flags
= gre_flags_to_tnl_flags(u
->o_flags
);
808 memcpy(p
->name
, u
->name
, sizeof(u
->name
));
811 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2
*u
,
812 const struct __ip6_tnl_parm
*p
)
814 u
->proto
= IPPROTO_GRE
;
818 u
->hop_limit
= p
->hop_limit
;
819 u
->encap_limit
= p
->encap_limit
;
820 u
->flowinfo
= p
->flowinfo
;
824 u
->i_flags
= gre_tnl_flags_to_gre_flags(p
->i_flags
);
825 u
->o_flags
= gre_tnl_flags_to_gre_flags(p
->o_flags
);
826 memcpy(u
->name
, p
->name
, sizeof(u
->name
));
829 static int ip6gre_tunnel_ioctl(struct net_device
*dev
,
830 struct ifreq
*ifr
, int cmd
)
833 struct ip6_tnl_parm2 p
;
834 struct __ip6_tnl_parm p1
;
835 struct ip6_tnl
*t
= netdev_priv(dev
);
836 struct net
*net
= t
->net
;
837 struct ip6gre_net
*ign
= net_generic(net
, ip6gre_net_id
);
839 memset(&p1
, 0, sizeof(p1
));
843 if (dev
== ign
->fb_tunnel_dev
) {
844 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
))) {
848 ip6gre_tnl_parm_from_user(&p1
, &p
);
849 t
= ip6gre_tunnel_locate(net
, &p1
, 0);
851 t
= netdev_priv(dev
);
853 memset(&p
, 0, sizeof(p
));
854 ip6gre_tnl_parm_to_user(&p
, &t
->parms
);
855 if (copy_to_user(ifr
->ifr_ifru
.ifru_data
, &p
, sizeof(p
)))
862 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
866 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
)))
870 if ((p
.i_flags
|p
.o_flags
)&(GRE_VERSION
|GRE_ROUTING
))
873 if (!(p
.i_flags
&GRE_KEY
))
875 if (!(p
.o_flags
&GRE_KEY
))
878 ip6gre_tnl_parm_from_user(&p1
, &p
);
879 t
= ip6gre_tunnel_locate(net
, &p1
, cmd
== SIOCADDTUNNEL
);
881 if (dev
!= ign
->fb_tunnel_dev
&& cmd
== SIOCCHGTUNNEL
) {
888 t
= netdev_priv(dev
);
890 ip6gre_tunnel_unlink(ign
, t
);
892 ip6gre_tnl_change(t
, &p1
, 1);
893 ip6gre_tunnel_link(ign
, t
);
894 netdev_state_change(dev
);
901 memset(&p
, 0, sizeof(p
));
902 ip6gre_tnl_parm_to_user(&p
, &t
->parms
);
903 if (copy_to_user(ifr
->ifr_ifru
.ifru_data
, &p
, sizeof(p
)))
906 err
= (cmd
== SIOCADDTUNNEL
? -ENOBUFS
: -ENOENT
);
911 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
914 if (dev
== ign
->fb_tunnel_dev
) {
916 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
)))
919 ip6gre_tnl_parm_from_user(&p1
, &p
);
920 t
= ip6gre_tunnel_locate(net
, &p1
, 0);
924 if (t
== netdev_priv(ign
->fb_tunnel_dev
))
928 unregister_netdevice(dev
);
940 static int ip6gre_header(struct sk_buff
*skb
, struct net_device
*dev
,
942 const void *daddr
, const void *saddr
, unsigned int len
)
944 struct ip6_tnl
*t
= netdev_priv(dev
);
945 struct ipv6hdr
*ipv6h
= (struct ipv6hdr
*)skb_push(skb
, t
->hlen
);
946 __be16
*p
= (__be16
*)(ipv6h
+1);
948 ip6_flow_hdr(ipv6h
, 0,
949 ip6_make_flowlabel(dev_net(dev
), skb
,
950 t
->fl
.u
.ip6
.flowlabel
, true,
952 ipv6h
->hop_limit
= t
->parms
.hop_limit
;
953 ipv6h
->nexthdr
= NEXTHDR_GRE
;
954 ipv6h
->saddr
= t
->parms
.laddr
;
955 ipv6h
->daddr
= t
->parms
.raddr
;
957 p
[0] = t
->parms
.o_flags
;
961 * Set the source hardware address.
965 memcpy(&ipv6h
->saddr
, saddr
, sizeof(struct in6_addr
));
967 memcpy(&ipv6h
->daddr
, daddr
, sizeof(struct in6_addr
));
968 if (!ipv6_addr_any(&ipv6h
->daddr
))
974 static const struct header_ops ip6gre_header_ops
= {
975 .create
= ip6gre_header
,
978 static const struct net_device_ops ip6gre_netdev_ops
= {
979 .ndo_init
= ip6gre_tunnel_init
,
980 .ndo_uninit
= ip6gre_tunnel_uninit
,
981 .ndo_start_xmit
= ip6gre_tunnel_xmit
,
982 .ndo_do_ioctl
= ip6gre_tunnel_ioctl
,
983 .ndo_change_mtu
= ip6_tnl_change_mtu
,
984 .ndo_get_stats64
= ip_tunnel_get_stats64
,
985 .ndo_get_iflink
= ip6_tnl_get_iflink
,
988 static void ip6gre_dev_free(struct net_device
*dev
)
990 struct ip6_tnl
*t
= netdev_priv(dev
);
992 dst_cache_destroy(&t
->dst_cache
);
993 free_percpu(dev
->tstats
);
996 static void ip6gre_tunnel_setup(struct net_device
*dev
)
998 dev
->netdev_ops
= &ip6gre_netdev_ops
;
999 dev
->needs_free_netdev
= true;
1000 dev
->priv_destructor
= ip6gre_dev_free
;
1002 dev
->type
= ARPHRD_IP6GRE
;
1004 dev
->flags
|= IFF_NOARP
;
1005 dev
->addr_len
= sizeof(struct in6_addr
);
1006 netif_keep_dst(dev
);
1007 /* This perm addr will be used as interface identifier by IPv6 */
1008 dev
->addr_assign_type
= NET_ADDR_RANDOM
;
1009 eth_random_addr(dev
->perm_addr
);
1012 static int ip6gre_tunnel_init_common(struct net_device
*dev
)
1014 struct ip6_tnl
*tunnel
;
1018 tunnel
= netdev_priv(dev
);
1021 tunnel
->net
= dev_net(dev
);
1022 strcpy(tunnel
->parms
.name
, dev
->name
);
1024 dev
->tstats
= netdev_alloc_pcpu_stats(struct pcpu_sw_netstats
);
1028 ret
= dst_cache_init(&tunnel
->dst_cache
, GFP_KERNEL
);
1030 free_percpu(dev
->tstats
);
1035 tunnel
->tun_hlen
= gre_calc_hlen(tunnel
->parms
.o_flags
);
1036 tunnel
->hlen
= tunnel
->tun_hlen
+ tunnel
->encap_hlen
;
1037 t_hlen
= tunnel
->hlen
+ sizeof(struct ipv6hdr
);
1039 dev
->hard_header_len
= LL_MAX_HEADER
+ t_hlen
;
1040 dev
->mtu
= ETH_DATA_LEN
- t_hlen
;
1041 if (dev
->type
== ARPHRD_ETHER
)
1042 dev
->mtu
-= ETH_HLEN
;
1043 if (!(tunnel
->parms
.flags
& IP6_TNL_F_IGN_ENCAP_LIMIT
))
1049 static int ip6gre_tunnel_init(struct net_device
*dev
)
1051 struct ip6_tnl
*tunnel
;
1054 ret
= ip6gre_tunnel_init_common(dev
);
1058 tunnel
= netdev_priv(dev
);
1060 memcpy(dev
->dev_addr
, &tunnel
->parms
.laddr
, sizeof(struct in6_addr
));
1061 memcpy(dev
->broadcast
, &tunnel
->parms
.raddr
, sizeof(struct in6_addr
));
1063 if (ipv6_addr_any(&tunnel
->parms
.raddr
))
1064 dev
->header_ops
= &ip6gre_header_ops
;
1069 static void ip6gre_fb_tunnel_init(struct net_device
*dev
)
1071 struct ip6_tnl
*tunnel
= netdev_priv(dev
);
1074 tunnel
->net
= dev_net(dev
);
1075 strcpy(tunnel
->parms
.name
, dev
->name
);
1077 tunnel
->hlen
= sizeof(struct ipv6hdr
) + 4;
1083 static struct inet6_protocol ip6gre_protocol __read_mostly
= {
1085 .err_handler
= ip6gre_err
,
1086 .flags
= INET6_PROTO_NOPOLICY
|INET6_PROTO_FINAL
,
1089 static void ip6gre_destroy_tunnels(struct net
*net
, struct list_head
*head
)
1091 struct ip6gre_net
*ign
= net_generic(net
, ip6gre_net_id
);
1092 struct net_device
*dev
, *aux
;
1095 for_each_netdev_safe(net
, dev
, aux
)
1096 if (dev
->rtnl_link_ops
== &ip6gre_link_ops
||
1097 dev
->rtnl_link_ops
== &ip6gre_tap_ops
)
1098 unregister_netdevice_queue(dev
, head
);
1100 for (prio
= 0; prio
< 4; prio
++) {
1102 for (h
= 0; h
< IP6_GRE_HASH_SIZE
; h
++) {
1105 t
= rtnl_dereference(ign
->tunnels
[prio
][h
]);
1108 /* If dev is in the same netns, it has already
1109 * been added to the list by the previous loop.
1111 if (!net_eq(dev_net(t
->dev
), net
))
1112 unregister_netdevice_queue(t
->dev
,
1114 t
= rtnl_dereference(t
->next
);
1120 static int __net_init
ip6gre_init_net(struct net
*net
)
1122 struct ip6gre_net
*ign
= net_generic(net
, ip6gre_net_id
);
1125 ign
->fb_tunnel_dev
= alloc_netdev(sizeof(struct ip6_tnl
), "ip6gre0",
1127 ip6gre_tunnel_setup
);
1128 if (!ign
->fb_tunnel_dev
) {
1132 dev_net_set(ign
->fb_tunnel_dev
, net
);
1133 /* FB netdevice is special: we have one, and only one per netns.
1134 * Allowing to move it to another netns is clearly unsafe.
1136 ign
->fb_tunnel_dev
->features
|= NETIF_F_NETNS_LOCAL
;
1139 ip6gre_fb_tunnel_init(ign
->fb_tunnel_dev
);
1140 ign
->fb_tunnel_dev
->rtnl_link_ops
= &ip6gre_link_ops
;
1142 err
= register_netdev(ign
->fb_tunnel_dev
);
1146 rcu_assign_pointer(ign
->tunnels_wc
[0],
1147 netdev_priv(ign
->fb_tunnel_dev
));
1151 free_netdev(ign
->fb_tunnel_dev
);
1156 static void __net_exit
ip6gre_exit_net(struct net
*net
)
1161 ip6gre_destroy_tunnels(net
, &list
);
1162 unregister_netdevice_many(&list
);
1166 static struct pernet_operations ip6gre_net_ops
= {
1167 .init
= ip6gre_init_net
,
1168 .exit
= ip6gre_exit_net
,
1169 .id
= &ip6gre_net_id
,
1170 .size
= sizeof(struct ip6gre_net
),
1173 static int ip6gre_tunnel_validate(struct nlattr
*tb
[], struct nlattr
*data
[])
1181 if (data
[IFLA_GRE_IFLAGS
])
1182 flags
|= nla_get_be16(data
[IFLA_GRE_IFLAGS
]);
1183 if (data
[IFLA_GRE_OFLAGS
])
1184 flags
|= nla_get_be16(data
[IFLA_GRE_OFLAGS
]);
1185 if (flags
& (GRE_VERSION
|GRE_ROUTING
))
1191 static int ip6gre_tap_validate(struct nlattr
*tb
[], struct nlattr
*data
[])
1193 struct in6_addr daddr
;
1195 if (tb
[IFLA_ADDRESS
]) {
1196 if (nla_len(tb
[IFLA_ADDRESS
]) != ETH_ALEN
)
1198 if (!is_valid_ether_addr(nla_data(tb
[IFLA_ADDRESS
])))
1199 return -EADDRNOTAVAIL
;
1205 if (data
[IFLA_GRE_REMOTE
]) {
1206 daddr
= nla_get_in6_addr(data
[IFLA_GRE_REMOTE
]);
1207 if (ipv6_addr_any(&daddr
))
1212 return ip6gre_tunnel_validate(tb
, data
);
1216 static void ip6gre_netlink_parms(struct nlattr
*data
[],
1217 struct __ip6_tnl_parm
*parms
)
1219 memset(parms
, 0, sizeof(*parms
));
1224 if (data
[IFLA_GRE_LINK
])
1225 parms
->link
= nla_get_u32(data
[IFLA_GRE_LINK
]);
1227 if (data
[IFLA_GRE_IFLAGS
])
1228 parms
->i_flags
= gre_flags_to_tnl_flags(
1229 nla_get_be16(data
[IFLA_GRE_IFLAGS
]));
1231 if (data
[IFLA_GRE_OFLAGS
])
1232 parms
->o_flags
= gre_flags_to_tnl_flags(
1233 nla_get_be16(data
[IFLA_GRE_OFLAGS
]));
1235 if (data
[IFLA_GRE_IKEY
])
1236 parms
->i_key
= nla_get_be32(data
[IFLA_GRE_IKEY
]);
1238 if (data
[IFLA_GRE_OKEY
])
1239 parms
->o_key
= nla_get_be32(data
[IFLA_GRE_OKEY
]);
1241 if (data
[IFLA_GRE_LOCAL
])
1242 parms
->laddr
= nla_get_in6_addr(data
[IFLA_GRE_LOCAL
]);
1244 if (data
[IFLA_GRE_REMOTE
])
1245 parms
->raddr
= nla_get_in6_addr(data
[IFLA_GRE_REMOTE
]);
1247 if (data
[IFLA_GRE_TTL
])
1248 parms
->hop_limit
= nla_get_u8(data
[IFLA_GRE_TTL
]);
1250 if (data
[IFLA_GRE_ENCAP_LIMIT
])
1251 parms
->encap_limit
= nla_get_u8(data
[IFLA_GRE_ENCAP_LIMIT
]);
1253 if (data
[IFLA_GRE_FLOWINFO
])
1254 parms
->flowinfo
= nla_get_be32(data
[IFLA_GRE_FLOWINFO
]);
1256 if (data
[IFLA_GRE_FLAGS
])
1257 parms
->flags
= nla_get_u32(data
[IFLA_GRE_FLAGS
]);
1259 if (data
[IFLA_GRE_FWMARK
])
1260 parms
->fwmark
= nla_get_u32(data
[IFLA_GRE_FWMARK
]);
1263 static int ip6gre_tap_init(struct net_device
*dev
)
1265 struct ip6_tnl
*tunnel
;
1268 ret
= ip6gre_tunnel_init_common(dev
);
1272 dev
->priv_flags
|= IFF_LIVE_ADDR_CHANGE
;
1274 tunnel
= netdev_priv(dev
);
1276 ip6gre_tnl_link_config(tunnel
, 1);
1281 static const struct net_device_ops ip6gre_tap_netdev_ops
= {
1282 .ndo_init
= ip6gre_tap_init
,
1283 .ndo_uninit
= ip6gre_tunnel_uninit
,
1284 .ndo_start_xmit
= ip6gre_tunnel_xmit
,
1285 .ndo_set_mac_address
= eth_mac_addr
,
1286 .ndo_validate_addr
= eth_validate_addr
,
1287 .ndo_change_mtu
= ip6_tnl_change_mtu
,
1288 .ndo_get_stats64
= ip_tunnel_get_stats64
,
1289 .ndo_get_iflink
= ip6_tnl_get_iflink
,
1292 #define GRE6_FEATURES (NETIF_F_SG | \
1293 NETIF_F_FRAGLIST | \
1297 static void ip6gre_tap_setup(struct net_device
*dev
)
1302 dev
->netdev_ops
= &ip6gre_tap_netdev_ops
;
1303 dev
->needs_free_netdev
= true;
1304 dev
->priv_destructor
= ip6gre_dev_free
;
1306 dev
->features
|= NETIF_F_NETNS_LOCAL
;
1307 dev
->priv_flags
&= ~IFF_TX_SKB_SHARING
;
1308 dev
->priv_flags
|= IFF_LIVE_ADDR_CHANGE
;
1311 static bool ip6gre_netlink_encap_parms(struct nlattr
*data
[],
1312 struct ip_tunnel_encap
*ipencap
)
1316 memset(ipencap
, 0, sizeof(*ipencap
));
1321 if (data
[IFLA_GRE_ENCAP_TYPE
]) {
1323 ipencap
->type
= nla_get_u16(data
[IFLA_GRE_ENCAP_TYPE
]);
1326 if (data
[IFLA_GRE_ENCAP_FLAGS
]) {
1328 ipencap
->flags
= nla_get_u16(data
[IFLA_GRE_ENCAP_FLAGS
]);
1331 if (data
[IFLA_GRE_ENCAP_SPORT
]) {
1333 ipencap
->sport
= nla_get_be16(data
[IFLA_GRE_ENCAP_SPORT
]);
1336 if (data
[IFLA_GRE_ENCAP_DPORT
]) {
1338 ipencap
->dport
= nla_get_be16(data
[IFLA_GRE_ENCAP_DPORT
]);
1344 static int ip6gre_newlink(struct net
*src_net
, struct net_device
*dev
,
1345 struct nlattr
*tb
[], struct nlattr
*data
[])
1348 struct net
*net
= dev_net(dev
);
1349 struct ip6gre_net
*ign
= net_generic(net
, ip6gre_net_id
);
1350 struct ip_tunnel_encap ipencap
;
1353 nt
= netdev_priv(dev
);
1355 if (ip6gre_netlink_encap_parms(data
, &ipencap
)) {
1356 int err
= ip6_tnl_encap_setup(nt
, &ipencap
);
1362 ip6gre_netlink_parms(data
, &nt
->parms
);
1364 if (ip6gre_tunnel_find(net
, &nt
->parms
, dev
->type
))
1367 if (dev
->type
== ARPHRD_ETHER
&& !tb
[IFLA_ADDRESS
])
1368 eth_hw_addr_random(dev
);
1371 nt
->net
= dev_net(dev
);
1372 ip6gre_tnl_link_config(nt
, !tb
[IFLA_MTU
]);
1374 dev
->features
|= GRE6_FEATURES
;
1375 dev
->hw_features
|= GRE6_FEATURES
;
1377 if (!(nt
->parms
.o_flags
& TUNNEL_SEQ
)) {
1378 /* TCP offload with GRE SEQ is not supported, nor
1379 * can we support 2 levels of outer headers requiring
1382 if (!(nt
->parms
.o_flags
& TUNNEL_CSUM
) ||
1383 (nt
->encap
.type
== TUNNEL_ENCAP_NONE
)) {
1384 dev
->features
|= NETIF_F_GSO_SOFTWARE
;
1385 dev
->hw_features
|= NETIF_F_GSO_SOFTWARE
;
1388 /* Can use a lockless transmit, unless we generate
1391 dev
->features
|= NETIF_F_LLTX
;
1394 err
= register_netdevice(dev
);
1399 ip6gre_tunnel_link(ign
, nt
);
1405 static int ip6gre_changelink(struct net_device
*dev
, struct nlattr
*tb
[],
1406 struct nlattr
*data
[])
1408 struct ip6_tnl
*t
, *nt
= netdev_priv(dev
);
1409 struct net
*net
= nt
->net
;
1410 struct ip6gre_net
*ign
= net_generic(net
, ip6gre_net_id
);
1411 struct __ip6_tnl_parm p
;
1412 struct ip_tunnel_encap ipencap
;
1414 if (dev
== ign
->fb_tunnel_dev
)
1417 if (ip6gre_netlink_encap_parms(data
, &ipencap
)) {
1418 int err
= ip6_tnl_encap_setup(nt
, &ipencap
);
1424 ip6gre_netlink_parms(data
, &p
);
1426 t
= ip6gre_tunnel_locate(net
, &p
, 0);
1435 ip6gre_tunnel_unlink(ign
, t
);
1436 ip6gre_tnl_change(t
, &p
, !tb
[IFLA_MTU
]);
1437 ip6gre_tunnel_link(ign
, t
);
1441 static void ip6gre_dellink(struct net_device
*dev
, struct list_head
*head
)
1443 struct net
*net
= dev_net(dev
);
1444 struct ip6gre_net
*ign
= net_generic(net
, ip6gre_net_id
);
1446 if (dev
!= ign
->fb_tunnel_dev
)
1447 unregister_netdevice_queue(dev
, head
);
1450 static size_t ip6gre_get_size(const struct net_device
*dev
)
1455 /* IFLA_GRE_IFLAGS */
1457 /* IFLA_GRE_OFLAGS */
1463 /* IFLA_GRE_LOCAL */
1464 nla_total_size(sizeof(struct in6_addr
)) +
1465 /* IFLA_GRE_REMOTE */
1466 nla_total_size(sizeof(struct in6_addr
)) +
1469 /* IFLA_GRE_ENCAP_LIMIT */
1471 /* IFLA_GRE_FLOWINFO */
1473 /* IFLA_GRE_FLAGS */
1475 /* IFLA_GRE_ENCAP_TYPE */
1477 /* IFLA_GRE_ENCAP_FLAGS */
1479 /* IFLA_GRE_ENCAP_SPORT */
1481 /* IFLA_GRE_ENCAP_DPORT */
1483 /* IFLA_GRE_FWMARK */
1488 static int ip6gre_fill_info(struct sk_buff
*skb
, const struct net_device
*dev
)
1490 struct ip6_tnl
*t
= netdev_priv(dev
);
1491 struct __ip6_tnl_parm
*p
= &t
->parms
;
1493 if (nla_put_u32(skb
, IFLA_GRE_LINK
, p
->link
) ||
1494 nla_put_be16(skb
, IFLA_GRE_IFLAGS
,
1495 gre_tnl_flags_to_gre_flags(p
->i_flags
)) ||
1496 nla_put_be16(skb
, IFLA_GRE_OFLAGS
,
1497 gre_tnl_flags_to_gre_flags(p
->o_flags
)) ||
1498 nla_put_be32(skb
, IFLA_GRE_IKEY
, p
->i_key
) ||
1499 nla_put_be32(skb
, IFLA_GRE_OKEY
, p
->o_key
) ||
1500 nla_put_in6_addr(skb
, IFLA_GRE_LOCAL
, &p
->laddr
) ||
1501 nla_put_in6_addr(skb
, IFLA_GRE_REMOTE
, &p
->raddr
) ||
1502 nla_put_u8(skb
, IFLA_GRE_TTL
, p
->hop_limit
) ||
1503 nla_put_u8(skb
, IFLA_GRE_ENCAP_LIMIT
, p
->encap_limit
) ||
1504 nla_put_be32(skb
, IFLA_GRE_FLOWINFO
, p
->flowinfo
) ||
1505 nla_put_u32(skb
, IFLA_GRE_FLAGS
, p
->flags
) ||
1506 nla_put_u32(skb
, IFLA_GRE_FWMARK
, p
->fwmark
))
1507 goto nla_put_failure
;
1509 if (nla_put_u16(skb
, IFLA_GRE_ENCAP_TYPE
,
1511 nla_put_be16(skb
, IFLA_GRE_ENCAP_SPORT
,
1513 nla_put_be16(skb
, IFLA_GRE_ENCAP_DPORT
,
1515 nla_put_u16(skb
, IFLA_GRE_ENCAP_FLAGS
,
1517 goto nla_put_failure
;
1525 static const struct nla_policy ip6gre_policy
[IFLA_GRE_MAX
+ 1] = {
1526 [IFLA_GRE_LINK
] = { .type
= NLA_U32
},
1527 [IFLA_GRE_IFLAGS
] = { .type
= NLA_U16
},
1528 [IFLA_GRE_OFLAGS
] = { .type
= NLA_U16
},
1529 [IFLA_GRE_IKEY
] = { .type
= NLA_U32
},
1530 [IFLA_GRE_OKEY
] = { .type
= NLA_U32
},
1531 [IFLA_GRE_LOCAL
] = { .len
= FIELD_SIZEOF(struct ipv6hdr
, saddr
) },
1532 [IFLA_GRE_REMOTE
] = { .len
= FIELD_SIZEOF(struct ipv6hdr
, daddr
) },
1533 [IFLA_GRE_TTL
] = { .type
= NLA_U8
},
1534 [IFLA_GRE_ENCAP_LIMIT
] = { .type
= NLA_U8
},
1535 [IFLA_GRE_FLOWINFO
] = { .type
= NLA_U32
},
1536 [IFLA_GRE_FLAGS
] = { .type
= NLA_U32
},
1537 [IFLA_GRE_ENCAP_TYPE
] = { .type
= NLA_U16
},
1538 [IFLA_GRE_ENCAP_FLAGS
] = { .type
= NLA_U16
},
1539 [IFLA_GRE_ENCAP_SPORT
] = { .type
= NLA_U16
},
1540 [IFLA_GRE_ENCAP_DPORT
] = { .type
= NLA_U16
},
1541 [IFLA_GRE_FWMARK
] = { .type
= NLA_U32
},
1544 static struct rtnl_link_ops ip6gre_link_ops __read_mostly
= {
1546 .maxtype
= IFLA_GRE_MAX
,
1547 .policy
= ip6gre_policy
,
1548 .priv_size
= sizeof(struct ip6_tnl
),
1549 .setup
= ip6gre_tunnel_setup
,
1550 .validate
= ip6gre_tunnel_validate
,
1551 .newlink
= ip6gre_newlink
,
1552 .changelink
= ip6gre_changelink
,
1553 .dellink
= ip6gre_dellink
,
1554 .get_size
= ip6gre_get_size
,
1555 .fill_info
= ip6gre_fill_info
,
1556 .get_link_net
= ip6_tnl_get_link_net
,
1559 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly
= {
1560 .kind
= "ip6gretap",
1561 .maxtype
= IFLA_GRE_MAX
,
1562 .policy
= ip6gre_policy
,
1563 .priv_size
= sizeof(struct ip6_tnl
),
1564 .setup
= ip6gre_tap_setup
,
1565 .validate
= ip6gre_tap_validate
,
1566 .newlink
= ip6gre_newlink
,
1567 .changelink
= ip6gre_changelink
,
1568 .get_size
= ip6gre_get_size
,
1569 .fill_info
= ip6gre_fill_info
,
1570 .get_link_net
= ip6_tnl_get_link_net
,
1574 * And now the modules code and kernel interface.
1577 static int __init
ip6gre_init(void)
1581 pr_info("GRE over IPv6 tunneling driver\n");
1583 err
= register_pernet_device(&ip6gre_net_ops
);
1587 err
= inet6_add_protocol(&ip6gre_protocol
, IPPROTO_GRE
);
1589 pr_info("%s: can't add protocol\n", __func__
);
1590 goto add_proto_failed
;
1593 err
= rtnl_link_register(&ip6gre_link_ops
);
1595 goto rtnl_link_failed
;
1597 err
= rtnl_link_register(&ip6gre_tap_ops
);
1599 goto tap_ops_failed
;
1605 rtnl_link_unregister(&ip6gre_link_ops
);
1607 inet6_del_protocol(&ip6gre_protocol
, IPPROTO_GRE
);
1609 unregister_pernet_device(&ip6gre_net_ops
);
1613 static void __exit
ip6gre_fini(void)
1615 rtnl_link_unregister(&ip6gre_tap_ops
);
1616 rtnl_link_unregister(&ip6gre_link_ops
);
1617 inet6_del_protocol(&ip6gre_protocol
, IPPROTO_GRE
);
1618 unregister_pernet_device(&ip6gre_net_ops
);
1621 module_init(ip6gre_init
);
1622 module_exit(ip6gre_fini
);
1623 MODULE_LICENSE("GPL");
1624 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1625 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1626 MODULE_ALIAS_RTNL_LINK("ip6gre");
1627 MODULE_ALIAS_RTNL_LINK("ip6gretap");
1628 MODULE_ALIAS_NETDEV("ip6gre0");