blob: ed9d681207fa340881fd100db0ea1cb3eb9a2ffb [file] [log] [blame]
Steffen Klasserted1efb22013-08-19 08:07:34 +02001/*
2 * IPv6 virtual tunneling interface
3 *
4 * Copyright (C) 2013 secunet Security Networks AG
5 *
6 * Author:
7 * Steffen Klassert <steffen.klassert@secunet.com>
8 *
9 * Based on:
10 * net/ipv6/ip6_tunnel.c
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
16 */
17
18#include <linux/module.h>
19#include <linux/capability.h>
20#include <linux/errno.h>
21#include <linux/types.h>
22#include <linux/sockios.h>
23#include <linux/icmp.h>
24#include <linux/if.h>
25#include <linux/in.h>
26#include <linux/ip.h>
Steffen Klasserted1efb22013-08-19 08:07:34 +020027#include <linux/net.h>
28#include <linux/in6.h>
29#include <linux/netdevice.h>
30#include <linux/if_arp.h>
31#include <linux/icmpv6.h>
32#include <linux/init.h>
33#include <linux/route.h>
34#include <linux/rtnetlink.h>
35#include <linux/netfilter_ipv6.h>
36#include <linux/slab.h>
37#include <linux/hash.h>
38
39#include <linux/uaccess.h>
40#include <linux/atomic.h>
41
42#include <net/icmp.h>
43#include <net/ip.h>
44#include <net/ip_tunnels.h>
45#include <net/ipv6.h>
46#include <net/ip6_route.h>
47#include <net/addrconf.h>
48#include <net/ip6_tunnel.h>
49#include <net/xfrm.h>
50#include <net/net_namespace.h>
51#include <net/netns/generic.h>
52
53#define HASH_SIZE_SHIFT 5
54#define HASH_SIZE (1 << HASH_SIZE_SHIFT)
55
56static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
57{
58 u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
59
60 return hash_32(hash, HASH_SIZE_SHIFT);
61}
62
63static int vti6_dev_init(struct net_device *dev);
64static void vti6_dev_setup(struct net_device *dev);
65static struct rtnl_link_ops vti6_link_ops __read_mostly;
66
67static int vti6_net_id __read_mostly;
68struct vti6_net {
69 /* the vti6 tunnel fallback device */
70 struct net_device *fb_tnl_dev;
71 /* lists for storing tunnels in use */
72 struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE];
73 struct ip6_tnl __rcu *tnls_wc[1];
74 struct ip6_tnl __rcu **tnls[2];
75};
76
Steffen Klasserted1efb22013-08-19 08:07:34 +020077#define for_each_vti6_tunnel_rcu(start) \
78 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
79
80/**
81 * vti6_tnl_lookup - fetch tunnel matching the end-point addresses
82 * @net: network namespace
83 * @remote: the address of the tunnel exit-point
84 * @local: the address of the tunnel entry-point
85 *
86 * Return:
87 * tunnel matching given end-points if found,
88 * else fallback tunnel if its device is up,
89 * else %NULL
90 **/
91static struct ip6_tnl *
92vti6_tnl_lookup(struct net *net, const struct in6_addr *remote,
93 const struct in6_addr *local)
94{
95 unsigned int hash = HASH(remote, local);
96 struct ip6_tnl *t;
97 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
Steffen Klassertfbe68ee2014-11-20 10:01:49 +010098 struct in6_addr any;
Steffen Klasserted1efb22013-08-19 08:07:34 +020099
100 for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
101 if (ipv6_addr_equal(local, &t->parms.laddr) &&
102 ipv6_addr_equal(remote, &t->parms.raddr) &&
103 (t->dev->flags & IFF_UP))
104 return t;
105 }
Steffen Klassertfbe68ee2014-11-20 10:01:49 +0100106
107 memset(&any, 0, sizeof(any));
108 hash = HASH(&any, local);
109 for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
110 if (ipv6_addr_equal(local, &t->parms.laddr) &&
111 (t->dev->flags & IFF_UP))
112 return t;
113 }
114
115 hash = HASH(remote, &any);
116 for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
117 if (ipv6_addr_equal(remote, &t->parms.raddr) &&
118 (t->dev->flags & IFF_UP))
119 return t;
120 }
121
Steffen Klasserted1efb22013-08-19 08:07:34 +0200122 t = rcu_dereference(ip6n->tnls_wc[0]);
123 if (t && (t->dev->flags & IFF_UP))
124 return t;
125
126 return NULL;
127}
128
129/**
130 * vti6_tnl_bucket - get head of list matching given tunnel parameters
131 * @p: parameters containing tunnel end-points
132 *
133 * Description:
134 * vti6_tnl_bucket() returns the head of the list matching the
135 * &struct in6_addr entries laddr and raddr in @p.
136 *
137 * Return: head of IPv6 tunnel list
138 **/
139static struct ip6_tnl __rcu **
140vti6_tnl_bucket(struct vti6_net *ip6n, const struct __ip6_tnl_parm *p)
141{
142 const struct in6_addr *remote = &p->raddr;
143 const struct in6_addr *local = &p->laddr;
144 unsigned int h = 0;
145 int prio = 0;
146
147 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
148 prio = 1;
149 h = HASH(remote, local);
150 }
151 return &ip6n->tnls[prio][h];
152}
153
154static void
155vti6_tnl_link(struct vti6_net *ip6n, struct ip6_tnl *t)
156{
157 struct ip6_tnl __rcu **tp = vti6_tnl_bucket(ip6n, &t->parms);
158
159 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
160 rcu_assign_pointer(*tp, t);
161}
162
163static void
164vti6_tnl_unlink(struct vti6_net *ip6n, struct ip6_tnl *t)
165{
166 struct ip6_tnl __rcu **tp;
167 struct ip6_tnl *iter;
168
169 for (tp = vti6_tnl_bucket(ip6n, &t->parms);
170 (iter = rtnl_dereference(*tp)) != NULL;
171 tp = &iter->next) {
172 if (t == iter) {
173 rcu_assign_pointer(*tp, t->next);
174 break;
175 }
176 }
177}
178
179static void vti6_dev_free(struct net_device *dev)
180{
181 free_percpu(dev->tstats);
182 free_netdev(dev);
183}
184
185static int vti6_tnl_create2(struct net_device *dev)
186{
187 struct ip6_tnl *t = netdev_priv(dev);
188 struct net *net = dev_net(dev);
189 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
190 int err;
191
Steffen Klasserted1efb22013-08-19 08:07:34 +0200192 err = register_netdevice(dev);
193 if (err < 0)
194 goto out;
195
196 strcpy(t->parms.name, dev->name);
197 dev->rtnl_link_ops = &vti6_link_ops;
198
199 dev_hold(dev);
200 vti6_tnl_link(ip6n, t);
201
202 return 0;
203
204out:
205 return err;
206}
207
208static struct ip6_tnl *vti6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
209{
210 struct net_device *dev;
211 struct ip6_tnl *t;
212 char name[IFNAMSIZ];
213 int err;
214
215 if (p->name[0])
216 strlcpy(name, p->name, IFNAMSIZ);
217 else
218 sprintf(name, "ip6_vti%%d");
219
Tom Gundersenc835a672014-07-14 16:37:24 +0200220 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, vti6_dev_setup);
Ian Morris63159f22015-03-29 14:00:04 +0100221 if (!dev)
Steffen Klasserted1efb22013-08-19 08:07:34 +0200222 goto failed;
223
224 dev_net_set(dev, net);
225
226 t = netdev_priv(dev);
227 t->parms = *p;
228 t->net = dev_net(dev);
229
230 err = vti6_tnl_create2(dev);
231 if (err < 0)
232 goto failed_free;
233
234 return t;
235
236failed_free:
237 vti6_dev_free(dev);
238failed:
239 return NULL;
240}
241
242/**
243 * vti6_locate - find or create tunnel matching given parameters
244 * @net: network namespace
245 * @p: tunnel parameters
246 * @create: != 0 if allowed to create new tunnel if no match found
247 *
248 * Description:
249 * vti6_locate() first tries to locate an existing tunnel
250 * based on @parms. If this is unsuccessful, but @create is set a new
251 * tunnel device is created and registered for use.
252 *
253 * Return:
254 * matching tunnel or NULL
255 **/
256static struct ip6_tnl *vti6_locate(struct net *net, struct __ip6_tnl_parm *p,
257 int create)
258{
259 const struct in6_addr *remote = &p->raddr;
260 const struct in6_addr *local = &p->laddr;
261 struct ip6_tnl __rcu **tp;
262 struct ip6_tnl *t;
263 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
264
265 for (tp = vti6_tnl_bucket(ip6n, p);
266 (t = rtnl_dereference(*tp)) != NULL;
267 tp = &t->next) {
268 if (ipv6_addr_equal(local, &t->parms.laddr) &&
Steffen Klassertd814b842014-09-22 10:07:25 +0200269 ipv6_addr_equal(remote, &t->parms.raddr)) {
270 if (create)
271 return NULL;
272
Steffen Klasserted1efb22013-08-19 08:07:34 +0200273 return t;
Steffen Klassertd814b842014-09-22 10:07:25 +0200274 }
Steffen Klasserted1efb22013-08-19 08:07:34 +0200275 }
276 if (!create)
277 return NULL;
278 return vti6_tnl_create(net, p);
279}
280
281/**
282 * vti6_dev_uninit - tunnel device uninitializer
283 * @dev: the device to be destroyed
284 *
285 * Description:
286 * vti6_dev_uninit() removes tunnel from its list
287 **/
288static void vti6_dev_uninit(struct net_device *dev)
289{
290 struct ip6_tnl *t = netdev_priv(dev);
Yao Xiwei092a29a2015-04-02 17:31:17 +0200291 struct vti6_net *ip6n = net_generic(t->net, vti6_net_id);
Steffen Klasserted1efb22013-08-19 08:07:34 +0200292
293 if (dev == ip6n->fb_tnl_dev)
294 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
295 else
296 vti6_tnl_unlink(ip6n, t);
Steffen Klasserted1efb22013-08-19 08:07:34 +0200297 dev_put(dev);
298}
299
300static int vti6_rcv(struct sk_buff *skb)
301{
302 struct ip6_tnl *t;
303 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
304
305 rcu_read_lock();
Ian Morrise5d08d72014-11-23 21:28:43 +0000306 t = vti6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr);
Ian Morris53b24b82015-03-29 14:00:05 +0100307 if (t) {
Steffen Klasserted1efb22013-08-19 08:07:34 +0200308 if (t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) {
309 rcu_read_unlock();
310 goto discard;
311 }
312
313 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
314 rcu_read_unlock();
315 return 0;
316 }
317
318 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) {
319 t->dev->stats.rx_dropped++;
320 rcu_read_unlock();
321 goto discard;
322 }
323
Steffen Klassertfa9ad962014-03-14 07:28:08 +0100324 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = t;
325 skb->mark = be32_to_cpu(t->parms.i_key);
Steffen Klasserted1efb22013-08-19 08:07:34 +0200326
327 rcu_read_unlock();
Steffen Klassertfa9ad962014-03-14 07:28:08 +0100328
329 return xfrm6_rcv(skb);
Steffen Klasserted1efb22013-08-19 08:07:34 +0200330 }
331 rcu_read_unlock();
Steffen Klassertfa9ad962014-03-14 07:28:08 +0100332 return -EINVAL;
Steffen Klasserted1efb22013-08-19 08:07:34 +0200333discard:
334 kfree_skb(skb);
335 return 0;
336}
337
Steffen Klassertfa9ad962014-03-14 07:28:08 +0100338static int vti6_rcv_cb(struct sk_buff *skb, int err)
339{
340 unsigned short family;
341 struct net_device *dev;
342 struct pcpu_sw_netstats *tstats;
343 struct xfrm_state *x;
344 struct ip6_tnl *t = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6;
345
346 if (!t)
347 return 1;
348
349 dev = t->dev;
350
351 if (err) {
352 dev->stats.rx_errors++;
353 dev->stats.rx_dropped++;
354
355 return 0;
356 }
357
358 x = xfrm_input_state(skb);
359 family = x->inner_mode->afinfo->family;
360
361 if (!xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family))
362 return -EPERM;
363
364 skb_scrub_packet(skb, !net_eq(t->net, dev_net(skb->dev)));
365 skb->dev = dev;
366
367 tstats = this_cpu_ptr(dev->tstats);
368 u64_stats_update_begin(&tstats->syncp);
369 tstats->rx_packets++;
370 tstats->rx_bytes += skb->len;
371 u64_stats_update_end(&tstats->syncp);
372
373 return 0;
374}
375
Steffen Klasserted1efb22013-08-19 08:07:34 +0200376/**
377 * vti6_addr_conflict - compare packet addresses to tunnel's own
378 * @t: the outgoing tunnel device
379 * @hdr: IPv6 header from the incoming packet
380 *
381 * Description:
382 * Avoid trivial tunneling loop by checking that tunnel exit-point
383 * doesn't match source of incoming packet.
384 *
385 * Return:
386 * 1 if conflict,
387 * 0 else
388 **/
389static inline bool
390vti6_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
391{
392 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
393}
394
Steffen Klassert26be8e22014-03-14 07:28:09 +0100395static bool vti6_state_check(const struct xfrm_state *x,
396 const struct in6_addr *dst,
397 const struct in6_addr *src)
398{
399 xfrm_address_t *daddr = (xfrm_address_t *)dst;
400 xfrm_address_t *saddr = (xfrm_address_t *)src;
401
402 /* if there is no transform then this tunnel is not functional.
403 * Or if the xfrm is not mode tunnel.
404 */
405 if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
406 x->props.family != AF_INET6)
407 return false;
408
409 if (ipv6_addr_any(dst))
410 return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET6);
411
412 if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET6))
413 return false;
414
415 return true;
416}
417
Steffen Klasserted1efb22013-08-19 08:07:34 +0200418/**
419 * vti6_xmit - send a packet
420 * @skb: the outgoing socket buffer
421 * @dev: the outgoing tunnel device
Steffen Klassert22e1b232014-03-14 07:28:08 +0100422 * @fl: the flow informations for the xfrm_lookup
Steffen Klasserted1efb22013-08-19 08:07:34 +0200423 **/
Steffen Klassert22e1b232014-03-14 07:28:08 +0100424static int
425vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
Steffen Klasserted1efb22013-08-19 08:07:34 +0200426{
Steffen Klasserted1efb22013-08-19 08:07:34 +0200427 struct ip6_tnl *t = netdev_priv(dev);
428 struct net_device_stats *stats = &t->dev->stats;
Steffen Klassert7c852582014-03-14 07:28:08 +0100429 struct dst_entry *dst = skb_dst(skb);
Steffen Klasserted1efb22013-08-19 08:07:34 +0200430 struct net_device *tdev;
Steffen Klassertd5005142014-11-05 08:02:48 +0100431 struct xfrm_state *x;
Steffen Klasserted1efb22013-08-19 08:07:34 +0200432 int err = -1;
433
Steffen Klassert7c852582014-03-14 07:28:08 +0100434 if (!dst)
435 goto tx_err_link_failure;
Steffen Klasserted1efb22013-08-19 08:07:34 +0200436
Steffen Klassert7c852582014-03-14 07:28:08 +0100437 dst_hold(dst);
Steffen Klassert22e1b232014-03-14 07:28:08 +0100438 dst = xfrm_lookup(t->net, dst, fl, NULL, 0);
Steffen Klassert7c852582014-03-14 07:28:08 +0100439 if (IS_ERR(dst)) {
440 err = PTR_ERR(dst);
441 dst = NULL;
442 goto tx_err_link_failure;
Steffen Klasserted1efb22013-08-19 08:07:34 +0200443 }
444
Steffen Klassertd5005142014-11-05 08:02:48 +0100445 x = dst->xfrm;
446 if (!vti6_state_check(x, &t->parms.raddr, &t->parms.laddr))
447 goto tx_err_link_failure;
448
449 if (!ip6_tnl_xmit_ctl(t, (const struct in6_addr *)&x->props.saddr,
450 (const struct in6_addr *)&x->id.daddr))
Steffen Klasserted1efb22013-08-19 08:07:34 +0200451 goto tx_err_link_failure;
452
453 tdev = dst->dev;
454
455 if (tdev == dev) {
456 stats->collisions++;
457 net_warn_ratelimited("%s: Local routing loop detected!\n",
458 t->parms.name);
459 goto tx_err_dst_release;
460 }
461
Steffen Klassert7c852582014-03-14 07:28:08 +0100462 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
463 skb_dst_set(skb, dst);
464 skb->dev = skb_dst(skb)->dev;
Steffen Klasserted1efb22013-08-19 08:07:34 +0200465
Steffen Klassert22e1b232014-03-14 07:28:08 +0100466 err = dst_output(skb);
467 if (net_xmit_eval(err) == 0) {
468 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
469
470 u64_stats_update_begin(&tstats->syncp);
471 tstats->tx_bytes += skb->len;
472 tstats->tx_packets++;
473 u64_stats_update_end(&tstats->syncp);
474 } else {
475 stats->tx_errors++;
476 stats->tx_aborted_errors++;
477 }
Steffen Klasserted1efb22013-08-19 08:07:34 +0200478
479 return 0;
480tx_err_link_failure:
481 stats->tx_carrier_errors++;
482 dst_link_failure(skb);
483tx_err_dst_release:
Steffen Klassert7c852582014-03-14 07:28:08 +0100484 dst_release(dst);
Steffen Klasserted1efb22013-08-19 08:07:34 +0200485 return err;
486}
487
488static netdev_tx_t
489vti6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
490{
491 struct ip6_tnl *t = netdev_priv(dev);
492 struct net_device_stats *stats = &t->dev->stats;
Steffen Klassert22e1b232014-03-14 07:28:08 +0100493 struct ipv6hdr *ipv6h;
494 struct flowi fl;
Steffen Klasserted1efb22013-08-19 08:07:34 +0200495 int ret;
496
Steffen Klassert22e1b232014-03-14 07:28:08 +0100497 memset(&fl, 0, sizeof(fl));
498 skb->mark = be32_to_cpu(t->parms.o_key);
499
Steffen Klasserted1efb22013-08-19 08:07:34 +0200500 switch (skb->protocol) {
501 case htons(ETH_P_IPV6):
Steffen Klassert22e1b232014-03-14 07:28:08 +0100502 ipv6h = ipv6_hdr(skb);
503
504 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
Steffen Klassertd5005142014-11-05 08:02:48 +0100505 vti6_addr_conflict(t, ipv6h))
Steffen Klassert22e1b232014-03-14 07:28:08 +0100506 goto tx_err;
507
508 xfrm_decode_session(skb, &fl, AF_INET6);
509 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
510 break;
511 case htons(ETH_P_IP):
512 xfrm_decode_session(skb, &fl, AF_INET);
513 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
Steffen Klasserted1efb22013-08-19 08:07:34 +0200514 break;
515 default:
516 goto tx_err;
517 }
518
Steffen Klassert22e1b232014-03-14 07:28:08 +0100519 ret = vti6_xmit(skb, dev, &fl);
Steffen Klasserted1efb22013-08-19 08:07:34 +0200520 if (ret < 0)
521 goto tx_err;
522
523 return NETDEV_TX_OK;
524
525tx_err:
526 stats->tx_errors++;
527 stats->tx_dropped++;
528 kfree_skb(skb);
529 return NETDEV_TX_OK;
530}
531
Steffen Klassertfa9ad962014-03-14 07:28:08 +0100532static int vti6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
533 u8 type, u8 code, int offset, __be32 info)
534{
535 __be32 spi;
Steffen Klassert6d004d62014-05-12 09:09:26 +0200536 __u32 mark;
Steffen Klassertfa9ad962014-03-14 07:28:08 +0100537 struct xfrm_state *x;
538 struct ip6_tnl *t;
539 struct ip_esp_hdr *esph;
540 struct ip_auth_hdr *ah;
541 struct ip_comp_hdr *ipch;
542 struct net *net = dev_net(skb->dev);
543 const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
544 int protocol = iph->nexthdr;
545
546 t = vti6_tnl_lookup(dev_net(skb->dev), &iph->daddr, &iph->saddr);
547 if (!t)
548 return -1;
549
Steffen Klassert6d004d62014-05-12 09:09:26 +0200550 mark = be32_to_cpu(t->parms.o_key);
551
Steffen Klassertfa9ad962014-03-14 07:28:08 +0100552 switch (protocol) {
553 case IPPROTO_ESP:
554 esph = (struct ip_esp_hdr *)(skb->data + offset);
555 spi = esph->spi;
556 break;
557 case IPPROTO_AH:
558 ah = (struct ip_auth_hdr *)(skb->data + offset);
559 spi = ah->spi;
560 break;
561 case IPPROTO_COMP:
562 ipch = (struct ip_comp_hdr *)(skb->data + offset);
563 spi = htonl(ntohs(ipch->cpi));
564 break;
565 default:
566 return 0;
567 }
568
569 if (type != ICMPV6_PKT_TOOBIG &&
570 type != NDISC_REDIRECT)
571 return 0;
572
Steffen Klassert6d004d62014-05-12 09:09:26 +0200573 x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
Steffen Klassertfa9ad962014-03-14 07:28:08 +0100574 spi, protocol, AF_INET6);
575 if (!x)
576 return 0;
577
578 if (type == NDISC_REDIRECT)
579 ip6_redirect(skb, net, skb->dev->ifindex, 0);
580 else
581 ip6_update_pmtu(skb, net, info, 0, 0);
582 xfrm_state_put(x);
583
584 return 0;
585}
586
Steffen Klasserted1efb22013-08-19 08:07:34 +0200587static void vti6_link_config(struct ip6_tnl *t)
588{
Steffen Klasserted1efb22013-08-19 08:07:34 +0200589 struct net_device *dev = t->dev;
590 struct __ip6_tnl_parm *p = &t->parms;
Steffen Klasserted1efb22013-08-19 08:07:34 +0200591
592 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
593 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
594
Steffen Klasserted1efb22013-08-19 08:07:34 +0200595 p->flags &= ~(IP6_TNL_F_CAP_XMIT | IP6_TNL_F_CAP_RCV |
596 IP6_TNL_F_CAP_PER_PACKET);
597 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
598
599 if (p->flags & IP6_TNL_F_CAP_XMIT && p->flags & IP6_TNL_F_CAP_RCV)
600 dev->flags |= IFF_POINTOPOINT;
601 else
602 dev->flags &= ~IFF_POINTOPOINT;
Steffen Klasserted1efb22013-08-19 08:07:34 +0200603}
604
605/**
606 * vti6_tnl_change - update the tunnel parameters
607 * @t: tunnel to be changed
608 * @p: tunnel configuration parameters
609 *
610 * Description:
611 * vti6_tnl_change() updates the tunnel parameters
612 **/
613static int
614vti6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
615{
616 t->parms.laddr = p->laddr;
617 t->parms.raddr = p->raddr;
618 t->parms.link = p->link;
619 t->parms.i_key = p->i_key;
620 t->parms.o_key = p->o_key;
621 t->parms.proto = p->proto;
622 ip6_tnl_dst_reset(t);
623 vti6_link_config(t);
624 return 0;
625}
626
627static int vti6_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
628{
629 struct net *net = dev_net(t->dev);
630 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
631 int err;
632
633 vti6_tnl_unlink(ip6n, t);
634 synchronize_net();
635 err = vti6_tnl_change(t, p);
636 vti6_tnl_link(ip6n, t);
637 netdev_state_change(t->dev);
638 return err;
639}
640
641static void
642vti6_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm2 *u)
643{
644 p->laddr = u->laddr;
645 p->raddr = u->raddr;
646 p->link = u->link;
647 p->i_key = u->i_key;
648 p->o_key = u->o_key;
649 p->proto = u->proto;
650
651 memcpy(p->name, u->name, sizeof(u->name));
652}
653
654static void
655vti6_parm_to_user(struct ip6_tnl_parm2 *u, const struct __ip6_tnl_parm *p)
656{
657 u->laddr = p->laddr;
658 u->raddr = p->raddr;
659 u->link = p->link;
660 u->i_key = p->i_key;
661 u->o_key = p->o_key;
662 u->proto = p->proto;
663
664 memcpy(u->name, p->name, sizeof(u->name));
665}
666
667/**
668 * vti6_tnl_ioctl - configure vti6 tunnels from userspace
669 * @dev: virtual device associated with tunnel
670 * @ifr: parameters passed from userspace
671 * @cmd: command to be performed
672 *
673 * Description:
674 * vti6_ioctl() is used for managing vti6 tunnels
675 * from userspace.
676 *
677 * The possible commands are the following:
678 * %SIOCGETTUNNEL: get tunnel parameters for device
679 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
680 * %SIOCCHGTUNNEL: change tunnel parameters to those given
681 * %SIOCDELTUNNEL: delete tunnel
682 *
683 * The fallback device "ip6_vti0", created during module
684 * initialization, can be used for creating other tunnel devices.
685 *
686 * Return:
687 * 0 on success,
688 * %-EFAULT if unable to copy data to or from userspace,
689 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
690 * %-EINVAL if passed tunnel parameters are invalid,
691 * %-EEXIST if changing a tunnel's parameters would cause a conflict
692 * %-ENODEV if attempting to change or delete a nonexisting device
693 **/
694static int
695vti6_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
696{
697 int err = 0;
698 struct ip6_tnl_parm2 p;
699 struct __ip6_tnl_parm p1;
700 struct ip6_tnl *t = NULL;
701 struct net *net = dev_net(dev);
702 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
703
704 switch (cmd) {
705 case SIOCGETTUNNEL:
706 if (dev == ip6n->fb_tnl_dev) {
707 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
708 err = -EFAULT;
709 break;
710 }
711 vti6_parm_from_user(&p1, &p);
712 t = vti6_locate(net, &p1, 0);
713 } else {
714 memset(&p, 0, sizeof(p));
715 }
Ian Morris63159f22015-03-29 14:00:04 +0100716 if (!t)
Steffen Klasserted1efb22013-08-19 08:07:34 +0200717 t = netdev_priv(dev);
718 vti6_parm_to_user(&p, &t->parms);
719 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
720 err = -EFAULT;
721 break;
722 case SIOCADDTUNNEL:
723 case SIOCCHGTUNNEL:
724 err = -EPERM;
725 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
726 break;
727 err = -EFAULT;
728 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
729 break;
730 err = -EINVAL;
731 if (p.proto != IPPROTO_IPV6 && p.proto != 0)
732 break;
733 vti6_parm_from_user(&p1, &p);
734 t = vti6_locate(net, &p1, cmd == SIOCADDTUNNEL);
735 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
Ian Morris53b24b82015-03-29 14:00:05 +0100736 if (t) {
Steffen Klasserted1efb22013-08-19 08:07:34 +0200737 if (t->dev != dev) {
738 err = -EEXIST;
739 break;
740 }
741 } else
742 t = netdev_priv(dev);
743
744 err = vti6_update(t, &p1);
745 }
746 if (t) {
747 err = 0;
748 vti6_parm_to_user(&p, &t->parms);
749 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
750 err = -EFAULT;
751
752 } else
753 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
754 break;
755 case SIOCDELTUNNEL:
756 err = -EPERM;
757 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
758 break;
759
760 if (dev == ip6n->fb_tnl_dev) {
761 err = -EFAULT;
762 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
763 break;
764 err = -ENOENT;
765 vti6_parm_from_user(&p1, &p);
766 t = vti6_locate(net, &p1, 0);
Ian Morris63159f22015-03-29 14:00:04 +0100767 if (!t)
Steffen Klasserted1efb22013-08-19 08:07:34 +0200768 break;
769 err = -EPERM;
770 if (t->dev == ip6n->fb_tnl_dev)
771 break;
772 dev = t->dev;
773 }
774 err = 0;
775 unregister_netdevice(dev);
776 break;
777 default:
778 err = -EINVAL;
779 }
780 return err;
781}
782
783/**
784 * vti6_tnl_change_mtu - change mtu manually for tunnel device
785 * @dev: virtual device associated with tunnel
786 * @new_mtu: the new mtu
787 *
788 * Return:
789 * 0 on success,
790 * %-EINVAL if mtu too small
791 **/
792static int vti6_change_mtu(struct net_device *dev, int new_mtu)
793{
794 if (new_mtu < IPV6_MIN_MTU)
795 return -EINVAL;
796
797 dev->mtu = new_mtu;
798 return 0;
799}
800
801static const struct net_device_ops vti6_netdev_ops = {
Steffen Klassert16a02312014-11-03 09:19:28 +0100802 .ndo_init = vti6_dev_init,
Steffen Klasserted1efb22013-08-19 08:07:34 +0200803 .ndo_uninit = vti6_dev_uninit,
804 .ndo_start_xmit = vti6_tnl_xmit,
805 .ndo_do_ioctl = vti6_ioctl,
806 .ndo_change_mtu = vti6_change_mtu,
Li RongQing469bdce2014-01-02 14:24:36 +0800807 .ndo_get_stats64 = ip_tunnel_get_stats64,
Nicolas Dichtelecf2c062015-04-02 17:07:01 +0200808 .ndo_get_iflink = ip6_tnl_get_iflink,
Steffen Klasserted1efb22013-08-19 08:07:34 +0200809};
810
811/**
812 * vti6_dev_setup - setup virtual tunnel device
813 * @dev: virtual device associated with tunnel
814 *
815 * Description:
816 * Initialize function pointers and device parameters
817 **/
818static void vti6_dev_setup(struct net_device *dev)
819{
Steffen Klasserted1efb22013-08-19 08:07:34 +0200820 dev->netdev_ops = &vti6_netdev_ops;
821 dev->destructor = vti6_dev_free;
822
823 dev->type = ARPHRD_TUNNEL6;
824 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr);
825 dev->mtu = ETH_DATA_LEN;
Steffen Klasserted1efb22013-08-19 08:07:34 +0200826 dev->flags |= IFF_NOARP;
827 dev->addr_len = sizeof(struct in6_addr);
Eric Dumazet02875872014-10-05 18:38:35 -0700828 netif_keep_dst(dev);
Steffen Klasserted1efb22013-08-19 08:07:34 +0200829}
830
831/**
832 * vti6_dev_init_gen - general initializer for all tunnel devices
833 * @dev: virtual device associated with tunnel
834 **/
835static inline int vti6_dev_init_gen(struct net_device *dev)
836{
837 struct ip6_tnl *t = netdev_priv(dev);
838
839 t->dev = dev;
840 t->net = dev_net(dev);
WANG Cong1c213bd2014-02-13 11:46:28 -0800841 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
Steffen Klasserted1efb22013-08-19 08:07:34 +0200842 if (!dev->tstats)
843 return -ENOMEM;
Steffen Klasserted1efb22013-08-19 08:07:34 +0200844 return 0;
845}
846
847/**
848 * vti6_dev_init - initializer for all non fallback tunnel devices
849 * @dev: virtual device associated with tunnel
850 **/
851static int vti6_dev_init(struct net_device *dev)
852{
853 struct ip6_tnl *t = netdev_priv(dev);
854 int err = vti6_dev_init_gen(dev);
855
856 if (err)
857 return err;
858 vti6_link_config(t);
859 return 0;
860}
861
862/**
863 * vti6_fb_tnl_dev_init - initializer for fallback tunnel device
864 * @dev: fallback device
865 *
866 * Return: 0
867 **/
868static int __net_init vti6_fb_tnl_dev_init(struct net_device *dev)
869{
870 struct ip6_tnl *t = netdev_priv(dev);
871 struct net *net = dev_net(dev);
872 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
Steffen Klasserted1efb22013-08-19 08:07:34 +0200873
874 t->parms.proto = IPPROTO_IPV6;
875 dev_hold(dev);
876
Steffen Klasserted1efb22013-08-19 08:07:34 +0200877 rcu_assign_pointer(ip6n->tnls_wc[0], t);
878 return 0;
879}
880
881static int vti6_validate(struct nlattr *tb[], struct nlattr *data[])
882{
883 return 0;
884}
885
886static void vti6_netlink_parms(struct nlattr *data[],
887 struct __ip6_tnl_parm *parms)
888{
889 memset(parms, 0, sizeof(*parms));
890
891 if (!data)
892 return;
893
894 if (data[IFLA_VTI_LINK])
895 parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
896
897 if (data[IFLA_VTI_LOCAL])
Jiri Benc67b61f62015-03-29 16:59:26 +0200898 parms->laddr = nla_get_in6_addr(data[IFLA_VTI_LOCAL]);
Steffen Klasserted1efb22013-08-19 08:07:34 +0200899
900 if (data[IFLA_VTI_REMOTE])
Jiri Benc67b61f62015-03-29 16:59:26 +0200901 parms->raddr = nla_get_in6_addr(data[IFLA_VTI_REMOTE]);
Steffen Klasserted1efb22013-08-19 08:07:34 +0200902
903 if (data[IFLA_VTI_IKEY])
904 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
905
906 if (data[IFLA_VTI_OKEY])
907 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
908}
909
910static int vti6_newlink(struct net *src_net, struct net_device *dev,
911 struct nlattr *tb[], struct nlattr *data[])
912{
913 struct net *net = dev_net(dev);
914 struct ip6_tnl *nt;
915
916 nt = netdev_priv(dev);
917 vti6_netlink_parms(data, &nt->parms);
918
919 nt->parms.proto = IPPROTO_IPV6;
920
921 if (vti6_locate(net, &nt->parms, 0))
922 return -EEXIST;
923
924 return vti6_tnl_create2(dev);
925}
926
lucien20ea60c2014-11-23 15:04:11 +0800927static void vti6_dellink(struct net_device *dev, struct list_head *head)
928{
929 struct net *net = dev_net(dev);
930 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
931
932 if (dev != ip6n->fb_tnl_dev)
933 unregister_netdevice_queue(dev, head);
934}
935
Steffen Klasserted1efb22013-08-19 08:07:34 +0200936static int vti6_changelink(struct net_device *dev, struct nlattr *tb[],
937 struct nlattr *data[])
938{
939 struct ip6_tnl *t;
940 struct __ip6_tnl_parm p;
941 struct net *net = dev_net(dev);
942 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
943
944 if (dev == ip6n->fb_tnl_dev)
945 return -EINVAL;
946
947 vti6_netlink_parms(data, &p);
948
949 t = vti6_locate(net, &p, 0);
950
951 if (t) {
952 if (t->dev != dev)
953 return -EEXIST;
954 } else
955 t = netdev_priv(dev);
956
957 return vti6_update(t, &p);
958}
959
960static size_t vti6_get_size(const struct net_device *dev)
961{
962 return
963 /* IFLA_VTI_LINK */
964 nla_total_size(4) +
965 /* IFLA_VTI_LOCAL */
966 nla_total_size(sizeof(struct in6_addr)) +
967 /* IFLA_VTI_REMOTE */
968 nla_total_size(sizeof(struct in6_addr)) +
969 /* IFLA_VTI_IKEY */
970 nla_total_size(4) +
971 /* IFLA_VTI_OKEY */
972 nla_total_size(4) +
973 0;
974}
975
976static int vti6_fill_info(struct sk_buff *skb, const struct net_device *dev)
977{
978 struct ip6_tnl *tunnel = netdev_priv(dev);
979 struct __ip6_tnl_parm *parm = &tunnel->parms;
980
981 if (nla_put_u32(skb, IFLA_VTI_LINK, parm->link) ||
Jiri Benc930345e2015-03-29 16:59:25 +0200982 nla_put_in6_addr(skb, IFLA_VTI_LOCAL, &parm->laddr) ||
983 nla_put_in6_addr(skb, IFLA_VTI_REMOTE, &parm->raddr) ||
Steffen Klasserted1efb22013-08-19 08:07:34 +0200984 nla_put_be32(skb, IFLA_VTI_IKEY, parm->i_key) ||
985 nla_put_be32(skb, IFLA_VTI_OKEY, parm->o_key))
986 goto nla_put_failure;
987 return 0;
988
989nla_put_failure:
990 return -EMSGSIZE;
991}
992
993static const struct nla_policy vti6_policy[IFLA_VTI_MAX + 1] = {
994 [IFLA_VTI_LINK] = { .type = NLA_U32 },
995 [IFLA_VTI_LOCAL] = { .len = sizeof(struct in6_addr) },
996 [IFLA_VTI_REMOTE] = { .len = sizeof(struct in6_addr) },
997 [IFLA_VTI_IKEY] = { .type = NLA_U32 },
998 [IFLA_VTI_OKEY] = { .type = NLA_U32 },
999};
1000
1001static struct rtnl_link_ops vti6_link_ops __read_mostly = {
1002 .kind = "vti6",
1003 .maxtype = IFLA_VTI_MAX,
1004 .policy = vti6_policy,
1005 .priv_size = sizeof(struct ip6_tnl),
1006 .setup = vti6_dev_setup,
1007 .validate = vti6_validate,
1008 .newlink = vti6_newlink,
lucien20ea60c2014-11-23 15:04:11 +08001009 .dellink = vti6_dellink,
Steffen Klasserted1efb22013-08-19 08:07:34 +02001010 .changelink = vti6_changelink,
1011 .get_size = vti6_get_size,
1012 .fill_info = vti6_fill_info,
Nicolas Dichtel1728d4f2015-01-15 15:11:17 +01001013 .get_link_net = ip6_tnl_get_link_net,
Steffen Klasserted1efb22013-08-19 08:07:34 +02001014};
1015
Steffen Klasserted1efb22013-08-19 08:07:34 +02001016static void __net_exit vti6_destroy_tunnels(struct vti6_net *ip6n)
1017{
1018 int h;
1019 struct ip6_tnl *t;
1020 LIST_HEAD(list);
1021
1022 for (h = 0; h < HASH_SIZE; h++) {
1023 t = rtnl_dereference(ip6n->tnls_r_l[h]);
Ian Morris53b24b82015-03-29 14:00:05 +01001024 while (t) {
Steffen Klasserted1efb22013-08-19 08:07:34 +02001025 unregister_netdevice_queue(t->dev, &list);
1026 t = rtnl_dereference(t->next);
1027 }
1028 }
1029
1030 t = rtnl_dereference(ip6n->tnls_wc[0]);
1031 unregister_netdevice_queue(t->dev, &list);
1032 unregister_netdevice_many(&list);
1033}
1034
1035static int __net_init vti6_init_net(struct net *net)
1036{
1037 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1038 struct ip6_tnl *t = NULL;
1039 int err;
1040
1041 ip6n->tnls[0] = ip6n->tnls_wc;
1042 ip6n->tnls[1] = ip6n->tnls_r_l;
1043
1044 err = -ENOMEM;
1045 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6_vti0",
Tom Gundersenc835a672014-07-14 16:37:24 +02001046 NET_NAME_UNKNOWN, vti6_dev_setup);
Steffen Klasserted1efb22013-08-19 08:07:34 +02001047
1048 if (!ip6n->fb_tnl_dev)
1049 goto err_alloc_dev;
1050 dev_net_set(ip6n->fb_tnl_dev, net);
lucien20ea60c2014-11-23 15:04:11 +08001051 ip6n->fb_tnl_dev->rtnl_link_ops = &vti6_link_ops;
Steffen Klasserted1efb22013-08-19 08:07:34 +02001052
1053 err = vti6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1054 if (err < 0)
1055 goto err_register;
1056
1057 err = register_netdev(ip6n->fb_tnl_dev);
1058 if (err < 0)
1059 goto err_register;
1060
1061 t = netdev_priv(ip6n->fb_tnl_dev);
1062
1063 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
1064 return 0;
1065
1066err_register:
1067 vti6_dev_free(ip6n->fb_tnl_dev);
1068err_alloc_dev:
1069 return err;
1070}
1071
1072static void __net_exit vti6_exit_net(struct net *net)
1073{
1074 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1075
1076 rtnl_lock();
1077 vti6_destroy_tunnels(ip6n);
1078 rtnl_unlock();
1079}
1080
1081static struct pernet_operations vti6_net_ops = {
1082 .init = vti6_init_net,
1083 .exit = vti6_exit_net,
1084 .id = &vti6_net_id,
1085 .size = sizeof(struct vti6_net),
1086};
1087
Steffen Klassertfa9ad962014-03-14 07:28:08 +01001088static struct xfrm6_protocol vti_esp6_protocol __read_mostly = {
1089 .handler = vti6_rcv,
1090 .cb_handler = vti6_rcv_cb,
1091 .err_handler = vti6_err,
1092 .priority = 100,
1093};
1094
1095static struct xfrm6_protocol vti_ah6_protocol __read_mostly = {
1096 .handler = vti6_rcv,
1097 .cb_handler = vti6_rcv_cb,
1098 .err_handler = vti6_err,
1099 .priority = 100,
1100};
1101
1102static struct xfrm6_protocol vti_ipcomp6_protocol __read_mostly = {
1103 .handler = vti6_rcv,
1104 .cb_handler = vti6_rcv_cb,
1105 .err_handler = vti6_err,
1106 .priority = 100,
1107};
1108
Steffen Klasserted1efb22013-08-19 08:07:34 +02001109/**
1110 * vti6_tunnel_init - register protocol and reserve needed resources
1111 *
1112 * Return: 0 on success
1113 **/
1114static int __init vti6_tunnel_init(void)
1115{
Mathias Krausee59d82f2014-05-09 23:43:41 +02001116 const char *msg;
1117 int err;
Steffen Klasserted1efb22013-08-19 08:07:34 +02001118
Mathias Krausee59d82f2014-05-09 23:43:41 +02001119 msg = "tunnel device";
Steffen Klasserted1efb22013-08-19 08:07:34 +02001120 err = register_pernet_device(&vti6_net_ops);
1121 if (err < 0)
Mathias Krausee59d82f2014-05-09 23:43:41 +02001122 goto pernet_dev_failed;
Steffen Klasserted1efb22013-08-19 08:07:34 +02001123
Mathias Krausee59d82f2014-05-09 23:43:41 +02001124 msg = "tunnel protocols";
Steffen Klassertfa9ad962014-03-14 07:28:08 +01001125 err = xfrm6_protocol_register(&vti_esp6_protocol, IPPROTO_ESP);
Mathias Krausee59d82f2014-05-09 23:43:41 +02001126 if (err < 0)
1127 goto xfrm_proto_esp_failed;
Steffen Klassertfa9ad962014-03-14 07:28:08 +01001128 err = xfrm6_protocol_register(&vti_ah6_protocol, IPPROTO_AH);
Mathias Krausee59d82f2014-05-09 23:43:41 +02001129 if (err < 0)
1130 goto xfrm_proto_ah_failed;
Steffen Klassertfa9ad962014-03-14 07:28:08 +01001131 err = xfrm6_protocol_register(&vti_ipcomp6_protocol, IPPROTO_COMP);
Mathias Krausee59d82f2014-05-09 23:43:41 +02001132 if (err < 0)
1133 goto xfrm_proto_comp_failed;
Steffen Klassertfa9ad962014-03-14 07:28:08 +01001134
Mathias Krausee59d82f2014-05-09 23:43:41 +02001135 msg = "netlink interface";
Steffen Klasserted1efb22013-08-19 08:07:34 +02001136 err = rtnl_link_register(&vti6_link_ops);
1137 if (err < 0)
1138 goto rtnl_link_failed;
1139
1140 return 0;
1141
1142rtnl_link_failed:
Steffen Klassertfa9ad962014-03-14 07:28:08 +01001143 xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
Mathias Krausee59d82f2014-05-09 23:43:41 +02001144xfrm_proto_comp_failed:
Steffen Klassertfa9ad962014-03-14 07:28:08 +01001145 xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
Mathias Krausee59d82f2014-05-09 23:43:41 +02001146xfrm_proto_ah_failed:
Steffen Klassertfa9ad962014-03-14 07:28:08 +01001147 xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
Mathias Krausee59d82f2014-05-09 23:43:41 +02001148xfrm_proto_esp_failed:
Steffen Klasserted1efb22013-08-19 08:07:34 +02001149 unregister_pernet_device(&vti6_net_ops);
Mathias Krausee59d82f2014-05-09 23:43:41 +02001150pernet_dev_failed:
1151 pr_err("vti6 init: failed to register %s\n", msg);
Steffen Klasserted1efb22013-08-19 08:07:34 +02001152 return err;
1153}
1154
1155/**
1156 * vti6_tunnel_cleanup - free resources and unregister protocol
1157 **/
1158static void __exit vti6_tunnel_cleanup(void)
1159{
1160 rtnl_link_unregister(&vti6_link_ops);
Mathias Krausee59d82f2014-05-09 23:43:41 +02001161 xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1162 xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1163 xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
Steffen Klasserted1efb22013-08-19 08:07:34 +02001164 unregister_pernet_device(&vti6_net_ops);
1165}
1166
1167module_init(vti6_tunnel_init);
1168module_exit(vti6_tunnel_cleanup);
1169MODULE_LICENSE("GPL");
1170MODULE_ALIAS_RTNL_LINK("vti6");
1171MODULE_ALIAS_NETDEV("ip6_vti0");
1172MODULE_AUTHOR("Steffen Klassert");
1173MODULE_DESCRIPTION("IPv6 virtual tunnel interface");