2 * Linux NET3: IP/IP protocol decoder.
4 * Version: $Id: ipip.c,v 1.50 2001/10/02 02:22:36 davem Exp $
7 * Sam Lantinga (slouken@cs.ucdavis.edu) 02/01/95
10 * Alan Cox : Merged and made usable non modular (its so tiny its silly as
11 * a module taking up 2 pages).
12 * Alan Cox : Fixed bug with 1.3.18 and IPIP not working (now needs to set skb->h.iph)
13 * to keep ip_forward happy.
14 * Alan Cox : More fixes for 1.3.21, and firewall fix. Maybe this will work soon 8).
15 * Kai Schulte : Fixed #defines for IP_FIREWALL->FIREWALL
16 * David Woodhouse : Perform some basic ICMP handling.
17 * IPIP Routing without decapsulation.
18 * Carlos Picoto : GRE over IP support
19 * Alexey Kuznetsov: Reworked. Really, now it is truncated version of ipv4/ip_gre.c.
20 * I do not want to merge them together.
22 * This program is free software; you can redistribute it and/or
23 * modify it under the terms of the GNU General Public License
24 * as published by the Free Software Foundation; either version
25 * 2 of the License, or (at your option) any later version.
29 /* tunnel.c: an IP tunnel driver
31 The purpose of this driver is to provide an IP tunnel through
32 which you can tunnel network traffic transparently across subnets.
34 This was written by looking at Nick Holloway's dummy driver
35 Thanks for the great code!
37 -Sam Lantinga (slouken@cs.ucdavis.edu) 02/01/95
40 Cleaned up the code a little and added some pre-1.3.0 tweaks.
41 dev->hard_header/hard_header_len changed to use no headers.
42 Comments/bracketing tweaked.
43 Made the tunnels use dev->name not tunnel: when error reporting.
46 -Alan Cox (Alan.Cox@linux.org) 21 March 95
49 Changed to tunnel to destination gateway in addition to the
50 tunnel's pointopoint address
51 Almost completely rewritten
52 Note: There is currently no firewall or ICMP handling done.
54 -Sam Lantinga (slouken@cs.ucdavis.edu) 02/13/96
58 /* Things I wish I had known when writing the tunnel driver:
60 When the tunnel_xmit() function is called, the skb contains the
61 packet to be sent (plus a great deal of extra info), and dev
62 contains the tunnel device that _we_ are.
64 When we are passed a packet, we are expected to fill in the
65 source address with our source IP address.
67 What is the proper way to allocate, copy and free a buffer?
68 After you allocate it, it is a "0 length" chunk of memory
69 starting at zero. If you want to add headers to the buffer
70 later, you'll have to call "skb_reserve(skb, amount)" with
71 the amount of memory you want reserved. Then, you call
72 "skb_put(skb, amount)" with the amount of space you want in
73 the buffer. skb_put() returns a pointer to the top (#0) of
74 that buffer. skb->len is set to the amount of space you have
75 "allocated" with skb_put(). You can then write up to skb->len
76 bytes to that buffer. If you need more, you can call skb_put()
77 again with the additional amount of space you need. You can
78 find out how much more space you can allocate by calling
80 Now, to add header space, call "skb_push(skb, header_len)".
81 This creates space at the beginning of the buffer and returns
82 a pointer to this new space. If later you need to strip a
83 header from a buffer, call "skb_pull(skb, header_len)".
84 skb_headroom() will return how much space is left at the top
85 of the buffer (before the main data). Remember, this headroom
86 space must be reserved before the skb_put() function is called.
90 This version of net/ipv4/ipip.c is cloned of net/ipv4/ip_gre.c
92 For comments look at net/ipv4/ip_gre.c --ANK
96 #include <linux/capability.h>
97 #include <linux/module.h>
98 #include <linux/types.h>
99 #include <linux/kernel.h>
100 #include <asm/uaccess.h>
101 #include <linux/skbuff.h>
102 #include <linux/netdevice.h>
103 #include <linux/in.h>
104 #include <linux/tcp.h>
105 #include <linux/udp.h>
106 #include <linux/if_arp.h>
107 #include <linux/mroute.h>
108 #include <linux/init.h>
109 #include <linux/netfilter_ipv4.h>
110 #include <linux/if_ether.h>
112 #include <net/sock.h>
114 #include <net/icmp.h>
115 #include <net/ipip.h>
116 #include <net/inet_ecn.h>
117 #include <net/xfrm.h>
120 #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)
122 static int ipip_fb_tunnel_init(struct net_device
*dev
);
123 static int ipip_tunnel_init(struct net_device
*dev
);
124 static void ipip_tunnel_setup(struct net_device
*dev
);
126 static struct net_device
*ipip_fb_tunnel_dev
;
128 static struct ip_tunnel
*tunnels_r_l
[HASH_SIZE
];
129 static struct ip_tunnel
*tunnels_r
[HASH_SIZE
];
130 static struct ip_tunnel
*tunnels_l
[HASH_SIZE
];
131 static struct ip_tunnel
*tunnels_wc
[1];
132 static struct ip_tunnel
**tunnels
[4] = { tunnels_wc
, tunnels_l
, tunnels_r
, tunnels_r_l
};
134 static DEFINE_RWLOCK(ipip_lock
);
136 static struct ip_tunnel
* ipip_tunnel_lookup(__be32 remote
, __be32 local
)
138 unsigned h0
= HASH(remote
);
139 unsigned h1
= HASH(local
);
142 for (t
= tunnels_r_l
[h0
^h1
]; t
; t
= t
->next
) {
143 if (local
== t
->parms
.iph
.saddr
&&
144 remote
== t
->parms
.iph
.daddr
&& (t
->dev
->flags
&IFF_UP
))
147 for (t
= tunnels_r
[h0
]; t
; t
= t
->next
) {
148 if (remote
== t
->parms
.iph
.daddr
&& (t
->dev
->flags
&IFF_UP
))
151 for (t
= tunnels_l
[h1
]; t
; t
= t
->next
) {
152 if (local
== t
->parms
.iph
.saddr
&& (t
->dev
->flags
&IFF_UP
))
155 if ((t
= tunnels_wc
[0]) != NULL
&& (t
->dev
->flags
&IFF_UP
))
160 static struct ip_tunnel
**ipip_bucket(struct ip_tunnel
*t
)
162 __be32 remote
= t
->parms
.iph
.daddr
;
163 __be32 local
= t
->parms
.iph
.saddr
;
175 return &tunnels
[prio
][h
];
179 static void ipip_tunnel_unlink(struct ip_tunnel
*t
)
181 struct ip_tunnel
**tp
;
183 for (tp
= ipip_bucket(t
); *tp
; tp
= &(*tp
)->next
) {
185 write_lock_bh(&ipip_lock
);
187 write_unlock_bh(&ipip_lock
);
193 static void ipip_tunnel_link(struct ip_tunnel
*t
)
195 struct ip_tunnel
**tp
= ipip_bucket(t
);
198 write_lock_bh(&ipip_lock
);
200 write_unlock_bh(&ipip_lock
);
203 static struct ip_tunnel
* ipip_tunnel_locate(struct ip_tunnel_parm
*parms
, int create
)
205 __be32 remote
= parms
->iph
.daddr
;
206 __be32 local
= parms
->iph
.saddr
;
207 struct ip_tunnel
*t
, **tp
, *nt
;
208 struct net_device
*dev
;
221 for (tp
= &tunnels
[prio
][h
]; (t
= *tp
) != NULL
; tp
= &t
->next
) {
222 if (local
== t
->parms
.iph
.saddr
&& remote
== t
->parms
.iph
.daddr
)
229 strlcpy(name
, parms
->name
, IFNAMSIZ
);
232 for (i
=1; i
<100; i
++) {
233 sprintf(name
, "tunl%d", i
);
234 if (__dev_get_by_name(name
) == NULL
)
241 dev
= alloc_netdev(sizeof(*t
), name
, ipip_tunnel_setup
);
245 nt
= netdev_priv(dev
);
246 SET_MODULE_OWNER(dev
);
247 dev
->init
= ipip_tunnel_init
;
250 if (register_netdevice(dev
) < 0) {
256 ipip_tunnel_link(nt
);
263 static void ipip_tunnel_uninit(struct net_device
*dev
)
265 if (dev
== ipip_fb_tunnel_dev
) {
266 write_lock_bh(&ipip_lock
);
267 tunnels_wc
[0] = NULL
;
268 write_unlock_bh(&ipip_lock
);
270 ipip_tunnel_unlink(netdev_priv(dev
));
274 static int ipip_err(struct sk_buff
*skb
, u32 info
)
276 #ifndef I_WISH_WORLD_WERE_PERFECT
278 /* It is not :-( All the routers (except for Linux) return only
279 8 bytes of packet payload. It means, that precise relaying of
280 ICMP in the real Internet is absolutely infeasible.
282 struct iphdr
*iph
= (struct iphdr
*)skb
->data
;
283 int type
= skb
->h
.icmph
->type
;
284 int code
= skb
->h
.icmph
->code
;
290 case ICMP_PARAMETERPROB
:
293 case ICMP_DEST_UNREACH
:
296 case ICMP_PORT_UNREACH
:
297 /* Impossible event. */
299 case ICMP_FRAG_NEEDED
:
300 /* Soft state for pmtu is maintained by IP core. */
303 /* All others are translated to HOST_UNREACH.
304 rfc2003 contains "deep thoughts" about NET_UNREACH,
305 I believe they are just ether pollution. --ANK
310 case ICMP_TIME_EXCEEDED
:
311 if (code
!= ICMP_EXC_TTL
)
318 read_lock(&ipip_lock
);
319 t
= ipip_tunnel_lookup(iph
->daddr
, iph
->saddr
);
320 if (t
== NULL
|| t
->parms
.iph
.daddr
== 0)
324 if (t
->parms
.iph
.ttl
== 0 && type
== ICMP_TIME_EXCEEDED
)
327 if (jiffies
- t
->err_time
< IPTUNNEL_ERR_TIMEO
)
331 t
->err_time
= jiffies
;
333 read_unlock(&ipip_lock
);
336 struct iphdr
*iph
= (struct iphdr
*)dp
;
337 int hlen
= iph
->ihl
<<2;
339 int type
= skb
->h
.icmph
->type
;
340 int code
= skb
->h
.icmph
->code
;
345 struct sk_buff
*skb2
;
349 if (len
< hlen
+ sizeof(struct iphdr
))
351 eiph
= (struct iphdr
*)(dp
+ hlen
);
356 case ICMP_PARAMETERPROB
:
357 n
= ntohl(skb
->h
.icmph
->un
.gateway
) >> 24;
361 /* So... This guy found something strange INSIDE encapsulated
362 packet. Well, he is fool, but what can we do ?
364 rel_type
= ICMP_PARAMETERPROB
;
365 rel_info
= htonl((n
- hlen
) << 24);
368 case ICMP_DEST_UNREACH
:
371 case ICMP_PORT_UNREACH
:
372 /* Impossible event. */
374 case ICMP_FRAG_NEEDED
:
375 /* And it is the only really necessary thing :-) */
376 n
= ntohs(skb
->h
.icmph
->un
.frag
.mtu
);
380 /* BSD 4.2 MORE DOES NOT EXIST IN NATURE. */
381 if (n
> ntohs(eiph
->tot_len
))
386 /* All others are translated to HOST_UNREACH.
387 rfc2003 contains "deep thoughts" about NET_UNREACH,
388 I believe, it is just ether pollution. --ANK
390 rel_type
= ICMP_DEST_UNREACH
;
391 rel_code
= ICMP_HOST_UNREACH
;
395 case ICMP_TIME_EXCEEDED
:
396 if (code
!= ICMP_EXC_TTL
)
401 /* Prepare fake skb to feed it to icmp_send */
402 skb2
= skb_clone(skb
, GFP_ATOMIC
);
405 dst_release(skb2
->dst
);
407 skb_pull(skb2
, skb
->data
- (u8
*)eiph
);
408 skb_reset_network_header(skb2
);
410 /* Try to guess incoming interface */
411 memset(&fl
, 0, sizeof(fl
));
412 fl
.fl4_daddr
= eiph
->saddr
;
413 fl
.fl4_tos
= RT_TOS(eiph
->tos
);
414 fl
.proto
= IPPROTO_IPIP
;
415 if (ip_route_output_key(&rt
, &key
)) {
419 skb2
->dev
= rt
->u
.dst
.dev
;
421 /* route "incoming" packet */
422 if (rt
->rt_flags
&RTCF_LOCAL
) {
425 fl
.fl4_daddr
= eiph
->daddr
;
426 fl
.fl4_src
= eiph
->saddr
;
427 fl
.fl4_tos
= eiph
->tos
;
428 if (ip_route_output_key(&rt
, &fl
) ||
429 rt
->u
.dst
.dev
->type
!= ARPHRD_TUNNEL
) {
436 if (ip_route_input(skb2
, eiph
->daddr
, eiph
->saddr
, eiph
->tos
, skb2
->dev
) ||
437 skb2
->dst
->dev
->type
!= ARPHRD_TUNNEL
) {
443 /* change mtu on this route */
444 if (type
== ICMP_DEST_UNREACH
&& code
== ICMP_FRAG_NEEDED
) {
445 if (n
> dst_mtu(skb2
->dst
)) {
449 skb2
->dst
->ops
->update_pmtu(skb2
->dst
, n
);
450 } else if (type
== ICMP_TIME_EXCEEDED
) {
451 struct ip_tunnel
*t
= netdev_priv(skb2
->dev
);
452 if (t
->parms
.iph
.ttl
) {
453 rel_type
= ICMP_DEST_UNREACH
;
454 rel_code
= ICMP_HOST_UNREACH
;
458 icmp_send(skb2
, rel_type
, rel_code
, rel_info
);
464 static inline void ipip_ecn_decapsulate(struct iphdr
*outer_iph
, struct sk_buff
*skb
)
466 struct iphdr
*inner_iph
= skb
->nh
.iph
;
468 if (INET_ECN_is_ce(outer_iph
->tos
))
469 IP_ECN_set_ce(inner_iph
);
472 static int ipip_rcv(struct sk_buff
*skb
)
475 struct ip_tunnel
*tunnel
;
479 read_lock(&ipip_lock
);
480 if ((tunnel
= ipip_tunnel_lookup(iph
->saddr
, iph
->daddr
)) != NULL
) {
481 if (!xfrm4_policy_check(NULL
, XFRM_POLICY_IN
, skb
)) {
482 read_unlock(&ipip_lock
);
489 skb
->mac
.raw
= skb
->nh
.raw
;
490 skb_reset_network_header(skb
);
491 skb
->protocol
= htons(ETH_P_IP
);
492 skb
->pkt_type
= PACKET_HOST
;
494 tunnel
->stat
.rx_packets
++;
495 tunnel
->stat
.rx_bytes
+= skb
->len
;
496 skb
->dev
= tunnel
->dev
;
497 dst_release(skb
->dst
);
500 ipip_ecn_decapsulate(iph
, skb
);
502 read_unlock(&ipip_lock
);
505 read_unlock(&ipip_lock
);
511 * This function assumes it is being called from dev_queue_xmit()
512 * and that skb is filled properly by that function.
515 static int ipip_tunnel_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
517 struct ip_tunnel
*tunnel
= netdev_priv(dev
);
518 struct net_device_stats
*stats
= &tunnel
->stat
;
519 struct iphdr
*tiph
= &tunnel
->parms
.iph
;
520 u8 tos
= tunnel
->parms
.iph
.tos
;
521 __be16 df
= tiph
->frag_off
;
522 struct rtable
*rt
; /* Route to the other host */
523 struct net_device
*tdev
; /* Device to other host */
524 struct iphdr
*old_iph
= skb
->nh
.iph
;
525 struct iphdr
*iph
; /* Our new IP header */
526 int max_headroom
; /* The extra header space needed */
527 __be32 dst
= tiph
->daddr
;
530 if (tunnel
->recursion
++) {
531 tunnel
->stat
.collisions
++;
535 if (skb
->protocol
!= htons(ETH_P_IP
))
543 if ((rt
= (struct rtable
*)skb
->dst
) == NULL
) {
544 tunnel
->stat
.tx_fifo_errors
++;
547 if ((dst
= rt
->rt_gateway
) == 0)
552 struct flowi fl
= { .oif
= tunnel
->parms
.link
,
555 .saddr
= tiph
->saddr
,
556 .tos
= RT_TOS(tos
) } },
557 .proto
= IPPROTO_IPIP
};
558 if (ip_route_output_key(&rt
, &fl
)) {
559 tunnel
->stat
.tx_carrier_errors
++;
563 tdev
= rt
->u
.dst
.dev
;
567 tunnel
->stat
.collisions
++;
572 mtu
= dst_mtu(&rt
->u
.dst
) - sizeof(struct iphdr
);
574 mtu
= skb
->dst
? dst_mtu(skb
->dst
) : dev
->mtu
;
577 tunnel
->stat
.collisions
++;
582 skb
->dst
->ops
->update_pmtu(skb
->dst
, mtu
);
584 df
|= (old_iph
->frag_off
&htons(IP_DF
));
586 if ((old_iph
->frag_off
&htons(IP_DF
)) && mtu
< ntohs(old_iph
->tot_len
)) {
587 icmp_send(skb
, ICMP_DEST_UNREACH
, ICMP_FRAG_NEEDED
, htonl(mtu
));
592 if (tunnel
->err_count
> 0) {
593 if (jiffies
- tunnel
->err_time
< IPTUNNEL_ERR_TIMEO
) {
595 dst_link_failure(skb
);
597 tunnel
->err_count
= 0;
601 * Okay, now see if we can stuff it in the buffer as-is.
603 max_headroom
= (LL_RESERVED_SPACE(tdev
)+sizeof(struct iphdr
));
605 if (skb_headroom(skb
) < max_headroom
|| skb_cloned(skb
) || skb_shared(skb
)) {
606 struct sk_buff
*new_skb
= skb_realloc_headroom(skb
, max_headroom
);
615 skb_set_owner_w(new_skb
, skb
->sk
);
618 old_iph
= skb
->nh
.iph
;
621 skb
->h
.raw
= skb
->nh
.raw
;
622 skb_push(skb
, sizeof(struct iphdr
));
623 skb_reset_network_header(skb
);
624 memset(&(IPCB(skb
)->opt
), 0, sizeof(IPCB(skb
)->opt
));
625 IPCB(skb
)->flags
&= ~(IPSKB_XFRM_TUNNEL_SIZE
| IPSKB_XFRM_TRANSFORMED
|
627 dst_release(skb
->dst
);
628 skb
->dst
= &rt
->u
.dst
;
631 * Push down and install the IPIP header.
636 iph
->ihl
= sizeof(struct iphdr
)>>2;
638 iph
->protocol
= IPPROTO_IPIP
;
639 iph
->tos
= INET_ECN_encapsulate(tos
, old_iph
->tos
);
640 iph
->daddr
= rt
->rt_dst
;
641 iph
->saddr
= rt
->rt_src
;
643 if ((iph
->ttl
= tiph
->ttl
) == 0)
644 iph
->ttl
= old_iph
->ttl
;
653 dst_link_failure(skb
);
662 ipip_tunnel_ioctl (struct net_device
*dev
, struct ifreq
*ifr
, int cmd
)
665 struct ip_tunnel_parm p
;
671 if (dev
== ipip_fb_tunnel_dev
) {
672 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
))) {
676 t
= ipip_tunnel_locate(&p
, 0);
679 t
= netdev_priv(dev
);
680 memcpy(&p
, &t
->parms
, sizeof(p
));
681 if (copy_to_user(ifr
->ifr_ifru
.ifru_data
, &p
, sizeof(p
)))
688 if (!capable(CAP_NET_ADMIN
))
692 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
)))
696 if (p
.iph
.version
!= 4 || p
.iph
.protocol
!= IPPROTO_IPIP
||
697 p
.iph
.ihl
!= 5 || (p
.iph
.frag_off
&htons(~IP_DF
)))
700 p
.iph
.frag_off
|= htons(IP_DF
);
702 t
= ipip_tunnel_locate(&p
, cmd
== SIOCADDTUNNEL
);
704 if (dev
!= ipip_fb_tunnel_dev
&& cmd
== SIOCCHGTUNNEL
) {
711 if (((dev
->flags
&IFF_POINTOPOINT
) && !p
.iph
.daddr
) ||
712 (!(dev
->flags
&IFF_POINTOPOINT
) && p
.iph
.daddr
)) {
716 t
= netdev_priv(dev
);
717 ipip_tunnel_unlink(t
);
718 t
->parms
.iph
.saddr
= p
.iph
.saddr
;
719 t
->parms
.iph
.daddr
= p
.iph
.daddr
;
720 memcpy(dev
->dev_addr
, &p
.iph
.saddr
, 4);
721 memcpy(dev
->broadcast
, &p
.iph
.daddr
, 4);
723 netdev_state_change(dev
);
729 if (cmd
== SIOCCHGTUNNEL
) {
730 t
->parms
.iph
.ttl
= p
.iph
.ttl
;
731 t
->parms
.iph
.tos
= p
.iph
.tos
;
732 t
->parms
.iph
.frag_off
= p
.iph
.frag_off
;
734 if (copy_to_user(ifr
->ifr_ifru
.ifru_data
, &t
->parms
, sizeof(p
)))
737 err
= (cmd
== SIOCADDTUNNEL
? -ENOBUFS
: -ENOENT
);
742 if (!capable(CAP_NET_ADMIN
))
745 if (dev
== ipip_fb_tunnel_dev
) {
747 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
)))
750 if ((t
= ipip_tunnel_locate(&p
, 0)) == NULL
)
753 if (t
->dev
== ipip_fb_tunnel_dev
)
757 unregister_netdevice(dev
);
769 static struct net_device_stats
*ipip_tunnel_get_stats(struct net_device
*dev
)
771 return &(((struct ip_tunnel
*)netdev_priv(dev
))->stat
);
774 static int ipip_tunnel_change_mtu(struct net_device
*dev
, int new_mtu
)
776 if (new_mtu
< 68 || new_mtu
> 0xFFF8 - sizeof(struct iphdr
))
782 static void ipip_tunnel_setup(struct net_device
*dev
)
784 SET_MODULE_OWNER(dev
);
785 dev
->uninit
= ipip_tunnel_uninit
;
786 dev
->hard_start_xmit
= ipip_tunnel_xmit
;
787 dev
->get_stats
= ipip_tunnel_get_stats
;
788 dev
->do_ioctl
= ipip_tunnel_ioctl
;
789 dev
->change_mtu
= ipip_tunnel_change_mtu
;
790 dev
->destructor
= free_netdev
;
792 dev
->type
= ARPHRD_TUNNEL
;
793 dev
->hard_header_len
= LL_MAX_HEADER
+ sizeof(struct iphdr
);
794 dev
->mtu
= ETH_DATA_LEN
- sizeof(struct iphdr
);
795 dev
->flags
= IFF_NOARP
;
800 static int ipip_tunnel_init(struct net_device
*dev
)
802 struct net_device
*tdev
= NULL
;
803 struct ip_tunnel
*tunnel
;
806 tunnel
= netdev_priv(dev
);
807 iph
= &tunnel
->parms
.iph
;
810 strcpy(tunnel
->parms
.name
, dev
->name
);
812 memcpy(dev
->dev_addr
, &tunnel
->parms
.iph
.saddr
, 4);
813 memcpy(dev
->broadcast
, &tunnel
->parms
.iph
.daddr
, 4);
816 struct flowi fl
= { .oif
= tunnel
->parms
.link
,
818 { .daddr
= iph
->daddr
,
820 .tos
= RT_TOS(iph
->tos
) } },
821 .proto
= IPPROTO_IPIP
};
823 if (!ip_route_output_key(&rt
, &fl
)) {
824 tdev
= rt
->u
.dst
.dev
;
827 dev
->flags
|= IFF_POINTOPOINT
;
830 if (!tdev
&& tunnel
->parms
.link
)
831 tdev
= __dev_get_by_index(tunnel
->parms
.link
);
834 dev
->hard_header_len
= tdev
->hard_header_len
+ sizeof(struct iphdr
);
835 dev
->mtu
= tdev
->mtu
- sizeof(struct iphdr
);
837 dev
->iflink
= tunnel
->parms
.link
;
842 static int __init
ipip_fb_tunnel_init(struct net_device
*dev
)
844 struct ip_tunnel
*tunnel
= netdev_priv(dev
);
845 struct iphdr
*iph
= &tunnel
->parms
.iph
;
848 strcpy(tunnel
->parms
.name
, dev
->name
);
851 iph
->protocol
= IPPROTO_IPIP
;
855 tunnels_wc
[0] = tunnel
;
859 static struct xfrm_tunnel ipip_handler
= {
861 .err_handler
= ipip_err
,
865 static char banner
[] __initdata
=
866 KERN_INFO
"IPv4 over IPv4 tunneling driver\n";
868 static int __init
ipip_init(void)
874 if (xfrm4_tunnel_register(&ipip_handler
, AF_INET
)) {
875 printk(KERN_INFO
"ipip init: can't register tunnel\n");
879 ipip_fb_tunnel_dev
= alloc_netdev(sizeof(struct ip_tunnel
),
882 if (!ipip_fb_tunnel_dev
) {
887 ipip_fb_tunnel_dev
->init
= ipip_fb_tunnel_init
;
889 if ((err
= register_netdev(ipip_fb_tunnel_dev
)))
894 free_netdev(ipip_fb_tunnel_dev
);
896 xfrm4_tunnel_deregister(&ipip_handler
, AF_INET
);
900 static void __exit
ipip_destroy_tunnels(void)
904 for (prio
= 1; prio
< 4; prio
++) {
906 for (h
= 0; h
< HASH_SIZE
; h
++) {
908 while ((t
= tunnels
[prio
][h
]) != NULL
)
909 unregister_netdevice(t
->dev
);
914 static void __exit
ipip_fini(void)
916 if (xfrm4_tunnel_deregister(&ipip_handler
, AF_INET
))
917 printk(KERN_INFO
"ipip close: can't deregister tunnel\n");
920 ipip_destroy_tunnels();
921 unregister_netdevice(ipip_fb_tunnel_dev
);
925 module_init(ipip_init
);
926 module_exit(ipip_fini
);
927 MODULE_LICENSE("GPL");
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