1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * IPv6 virtual tunneling interface
4 *
5 * Copyright (C) 2013 secunet Security Networks AG
6 *
7 * Author:
8 * Steffen Klassert <steffen.klassert@secunet.com>
9 *
10 * Based on:
11 * net/ipv6/ip6_tunnel.c
12 */
13
14 #include <linux/module.h>
15 #include <linux/capability.h>
16 #include <linux/errno.h>
17 #include <linux/types.h>
18 #include <linux/sockios.h>
19 #include <linux/icmp.h>
20 #include <linux/if.h>
21 #include <linux/in.h>
22 #include <linux/ip.h>
23 #include <linux/net.h>
24 #include <linux/in6.h>
25 #include <linux/netdevice.h>
26 #include <linux/if_arp.h>
27 #include <linux/icmpv6.h>
28 #include <linux/init.h>
29 #include <linux/route.h>
30 #include <linux/rtnetlink.h>
31 #include <linux/netfilter_ipv6.h>
32 #include <linux/slab.h>
33 #include <linux/hash.h>
34
35 #include <linux/uaccess.h>
36 #include <linux/atomic.h>
37
38 #include <net/icmp.h>
39 #include <net/ip.h>
40 #include <net/ip_tunnels.h>
41 #include <net/ipv6.h>
42 #include <net/ip6_route.h>
43 #include <net/addrconf.h>
44 #include <net/ip6_tunnel.h>
45 #include <net/xfrm.h>
46 #include <net/net_namespace.h>
47 #include <net/netns/generic.h>
48 #include <linux/etherdevice.h>
49
50 #define IP6_VTI_HASH_SIZE_SHIFT 5
51 #define IP6_VTI_HASH_SIZE (1 << IP6_VTI_HASH_SIZE_SHIFT)
52
HASH(const struct in6_addr * addr1,const struct in6_addr * addr2)53 static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
54 {
55 u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
56
57 return hash_32(hash, IP6_VTI_HASH_SIZE_SHIFT);
58 }
59
60 static int vti6_dev_init(struct net_device *dev);
61 static void vti6_dev_setup(struct net_device *dev);
62 static struct rtnl_link_ops vti6_link_ops __read_mostly;
63
64 static unsigned int vti6_net_id __read_mostly;
65 struct vti6_net {
66 /* the vti6 tunnel fallback device */
67 struct net_device *fb_tnl_dev;
68 /* lists for storing tunnels in use */
69 struct ip6_tnl __rcu *tnls_r_l[IP6_VTI_HASH_SIZE];
70 struct ip6_tnl __rcu *tnls_wc[1];
71 struct ip6_tnl __rcu **tnls[2];
72 };
73
74 #define for_each_vti6_tunnel_rcu(start) \
75 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
76
77 /**
78 * vti6_tnl_lookup - fetch tunnel matching the end-point addresses
79 * @net: network namespace
80 * @remote: the address of the tunnel exit-point
81 * @local: the address of the tunnel entry-point
82 *
83 * Return:
84 * tunnel matching given end-points if found,
85 * else fallback tunnel if its device is up,
86 * else %NULL
87 **/
88 static struct ip6_tnl *
vti6_tnl_lookup(struct net * net,const struct in6_addr * remote,const struct in6_addr * local)89 vti6_tnl_lookup(struct net *net, const struct in6_addr *remote,
90 const struct in6_addr *local)
91 {
92 unsigned int hash = HASH(remote, local);
93 struct ip6_tnl *t;
94 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
95 struct in6_addr any;
96
97 for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
98 if (ipv6_addr_equal(local, &t->parms.laddr) &&
99 ipv6_addr_equal(remote, &t->parms.raddr) &&
100 (t->dev->flags & IFF_UP))
101 return t;
102 }
103
104 memset(&any, 0, sizeof(any));
105 hash = HASH(&any, local);
106 for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
107 if (ipv6_addr_equal(local, &t->parms.laddr) &&
108 (t->dev->flags & IFF_UP))
109 return t;
110 }
111
112 hash = HASH(remote, &any);
113 for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
114 if (ipv6_addr_equal(remote, &t->parms.raddr) &&
115 (t->dev->flags & IFF_UP))
116 return t;
117 }
118
119 t = rcu_dereference(ip6n->tnls_wc[0]);
120 if (t && (t->dev->flags & IFF_UP))
121 return t;
122
123 return NULL;
124 }
125
126 /**
127 * vti6_tnl_bucket - get head of list matching given tunnel parameters
128 * @p: parameters containing tunnel end-points
129 *
130 * Description:
131 * vti6_tnl_bucket() returns the head of the list matching the
132 * &struct in6_addr entries laddr and raddr in @p.
133 *
134 * Return: head of IPv6 tunnel list
135 **/
136 static struct ip6_tnl __rcu **
vti6_tnl_bucket(struct vti6_net * ip6n,const struct __ip6_tnl_parm * p)137 vti6_tnl_bucket(struct vti6_net *ip6n, const struct __ip6_tnl_parm *p)
138 {
139 const struct in6_addr *remote = &p->raddr;
140 const struct in6_addr *local = &p->laddr;
141 unsigned int h = 0;
142 int prio = 0;
143
144 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
145 prio = 1;
146 h = HASH(remote, local);
147 }
148 return &ip6n->tnls[prio][h];
149 }
150
151 static void
vti6_tnl_link(struct vti6_net * ip6n,struct ip6_tnl * t)152 vti6_tnl_link(struct vti6_net *ip6n, struct ip6_tnl *t)
153 {
154 struct ip6_tnl __rcu **tp = vti6_tnl_bucket(ip6n, &t->parms);
155
156 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
157 rcu_assign_pointer(*tp, t);
158 }
159
160 static void
vti6_tnl_unlink(struct vti6_net * ip6n,struct ip6_tnl * t)161 vti6_tnl_unlink(struct vti6_net *ip6n, struct ip6_tnl *t)
162 {
163 struct ip6_tnl __rcu **tp;
164 struct ip6_tnl *iter;
165
166 for (tp = vti6_tnl_bucket(ip6n, &t->parms);
167 (iter = rtnl_dereference(*tp)) != NULL;
168 tp = &iter->next) {
169 if (t == iter) {
170 rcu_assign_pointer(*tp, t->next);
171 break;
172 }
173 }
174 }
175
vti6_dev_free(struct net_device * dev)176 static void vti6_dev_free(struct net_device *dev)
177 {
178 free_percpu(dev->tstats);
179 }
180
vti6_tnl_create2(struct net_device * dev)181 static int vti6_tnl_create2(struct net_device *dev)
182 {
183 struct ip6_tnl *t = netdev_priv(dev);
184 struct net *net = dev_net(dev);
185 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
186 int err;
187
188 dev->rtnl_link_ops = &vti6_link_ops;
189 err = register_netdevice(dev);
190 if (err < 0)
191 goto out;
192
193 strcpy(t->parms.name, dev->name);
194
195 vti6_tnl_link(ip6n, t);
196
197 return 0;
198
199 out:
200 return err;
201 }
202
vti6_tnl_create(struct net * net,struct __ip6_tnl_parm * p)203 static struct ip6_tnl *vti6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
204 {
205 struct net_device *dev;
206 struct ip6_tnl *t;
207 char name[IFNAMSIZ];
208 int err;
209
210 if (p->name[0]) {
211 if (!dev_valid_name(p->name))
212 goto failed;
213 strlcpy(name, p->name, IFNAMSIZ);
214 } else {
215 sprintf(name, "ip6_vti%%d");
216 }
217
218 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, vti6_dev_setup);
219 if (!dev)
220 goto failed;
221
222 dev_net_set(dev, net);
223
224 t = netdev_priv(dev);
225 t->parms = *p;
226 t->net = dev_net(dev);
227
228 err = vti6_tnl_create2(dev);
229 if (err < 0)
230 goto failed_free;
231
232 return t;
233
234 failed_free:
235 free_netdev(dev);
236 failed:
237 return NULL;
238 }
239
240 /**
241 * vti6_locate - find or create tunnel matching given parameters
242 * @net: network namespace
243 * @p: tunnel parameters
244 * @create: != 0 if allowed to create new tunnel if no match found
245 *
246 * Description:
247 * vti6_locate() first tries to locate an existing tunnel
248 * based on @parms. If this is unsuccessful, but @create is set a new
249 * tunnel device is created and registered for use.
250 *
251 * Return:
252 * matching tunnel or NULL
253 **/
vti6_locate(struct net * net,struct __ip6_tnl_parm * p,int create)254 static struct ip6_tnl *vti6_locate(struct net *net, struct __ip6_tnl_parm *p,
255 int create)
256 {
257 const struct in6_addr *remote = &p->raddr;
258 const struct in6_addr *local = &p->laddr;
259 struct ip6_tnl __rcu **tp;
260 struct ip6_tnl *t;
261 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
262
263 for (tp = vti6_tnl_bucket(ip6n, p);
264 (t = rtnl_dereference(*tp)) != NULL;
265 tp = &t->next) {
266 if (ipv6_addr_equal(local, &t->parms.laddr) &&
267 ipv6_addr_equal(remote, &t->parms.raddr)) {
268 if (create)
269 return NULL;
270
271 return t;
272 }
273 }
274 if (!create)
275 return NULL;
276 return vti6_tnl_create(net, p);
277 }
278
279 /**
280 * vti6_dev_uninit - tunnel device uninitializer
281 * @dev: the device to be destroyed
282 *
283 * Description:
284 * vti6_dev_uninit() removes tunnel from its list
285 **/
vti6_dev_uninit(struct net_device * dev)286 static void vti6_dev_uninit(struct net_device *dev)
287 {
288 struct ip6_tnl *t = netdev_priv(dev);
289 struct vti6_net *ip6n = net_generic(t->net, vti6_net_id);
290
291 if (dev == ip6n->fb_tnl_dev)
292 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
293 else
294 vti6_tnl_unlink(ip6n, t);
295 dev_put(dev);
296 }
297
vti6_input_proto(struct sk_buff * skb,int nexthdr,__be32 spi,int encap_type)298 static int vti6_input_proto(struct sk_buff *skb, int nexthdr, __be32 spi,
299 int encap_type)
300 {
301 struct ip6_tnl *t;
302 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
303
304 rcu_read_lock();
305 t = vti6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr);
306 if (t) {
307 if (t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) {
308 rcu_read_unlock();
309 goto discard;
310 }
311
312 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
313 rcu_read_unlock();
314 goto discard;
315 }
316
317 ipv6h = ipv6_hdr(skb);
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
324 rcu_read_unlock();
325
326 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = t;
327 XFRM_SPI_SKB_CB(skb)->family = AF_INET6;
328 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr);
329 return xfrm_input(skb, nexthdr, spi, encap_type);
330 }
331 rcu_read_unlock();
332 return -EINVAL;
333 discard:
334 kfree_skb(skb);
335 return 0;
336 }
337
vti6_rcv(struct sk_buff * skb)338 static int vti6_rcv(struct sk_buff *skb)
339 {
340 int nexthdr = skb_network_header(skb)[IP6CB(skb)->nhoff];
341
342 return vti6_input_proto(skb, nexthdr, 0, 0);
343 }
344
vti6_rcv_cb(struct sk_buff * skb,int err)345 static int vti6_rcv_cb(struct sk_buff *skb, int err)
346 {
347 unsigned short family;
348 struct net_device *dev;
349 struct xfrm_state *x;
350 const struct xfrm_mode *inner_mode;
351 struct ip6_tnl *t = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6;
352 u32 orig_mark = skb->mark;
353 int ret;
354
355 if (!t)
356 return 1;
357
358 dev = t->dev;
359
360 if (err) {
361 dev->stats.rx_errors++;
362 dev->stats.rx_dropped++;
363
364 return 0;
365 }
366
367 x = xfrm_input_state(skb);
368
369 inner_mode = &x->inner_mode;
370
371 if (x->sel.family == AF_UNSPEC) {
372 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
373 if (inner_mode == NULL) {
374 XFRM_INC_STATS(dev_net(skb->dev),
375 LINUX_MIB_XFRMINSTATEMODEERROR);
376 return -EINVAL;
377 }
378 }
379
380 family = inner_mode->family;
381
382 skb->mark = be32_to_cpu(t->parms.i_key);
383 ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family);
384 skb->mark = orig_mark;
385
386 if (!ret)
387 return -EPERM;
388
389 skb_scrub_packet(skb, !net_eq(t->net, dev_net(skb->dev)));
390 skb->dev = dev;
391 dev_sw_netstats_rx_add(dev, skb->len);
392
393 return 0;
394 }
395
396 /**
397 * vti6_addr_conflict - compare packet addresses to tunnel's own
398 * @t: the outgoing tunnel device
399 * @hdr: IPv6 header from the incoming packet
400 *
401 * Description:
402 * Avoid trivial tunneling loop by checking that tunnel exit-point
403 * doesn't match source of incoming packet.
404 *
405 * Return:
406 * 1 if conflict,
407 * 0 else
408 **/
409 static inline bool
vti6_addr_conflict(const struct ip6_tnl * t,const struct ipv6hdr * hdr)410 vti6_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
411 {
412 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
413 }
414
vti6_state_check(const struct xfrm_state * x,const struct in6_addr * dst,const struct in6_addr * src)415 static bool vti6_state_check(const struct xfrm_state *x,
416 const struct in6_addr *dst,
417 const struct in6_addr *src)
418 {
419 xfrm_address_t *daddr = (xfrm_address_t *)dst;
420 xfrm_address_t *saddr = (xfrm_address_t *)src;
421
422 /* if there is no transform then this tunnel is not functional.
423 * Or if the xfrm is not mode tunnel.
424 */
425 if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
426 x->props.family != AF_INET6)
427 return false;
428
429 if (ipv6_addr_any(dst))
430 return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET6);
431
432 if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET6))
433 return false;
434
435 return true;
436 }
437
438 /**
439 * vti6_xmit - send a packet
440 * @skb: the outgoing socket buffer
441 * @dev: the outgoing tunnel device
442 * @fl: the flow informations for the xfrm_lookup
443 **/
444 static int
vti6_xmit(struct sk_buff * skb,struct net_device * dev,struct flowi * fl)445 vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
446 {
447 struct ip6_tnl *t = netdev_priv(dev);
448 struct net_device_stats *stats = &t->dev->stats;
449 struct dst_entry *dst = skb_dst(skb);
450 struct net_device *tdev;
451 struct xfrm_state *x;
452 int pkt_len = skb->len;
453 int err = -1;
454 int mtu;
455
456 if (!dst) {
457 switch (skb->protocol) {
458 case htons(ETH_P_IP): {
459 struct rtable *rt;
460
461 fl->u.ip4.flowi4_oif = dev->ifindex;
462 fl->u.ip4.flowi4_flags |= FLOWI_FLAG_ANYSRC;
463 rt = __ip_route_output_key(dev_net(dev), &fl->u.ip4);
464 if (IS_ERR(rt))
465 goto tx_err_link_failure;
466 dst = &rt->dst;
467 skb_dst_set(skb, dst);
468 break;
469 }
470 case htons(ETH_P_IPV6):
471 fl->u.ip6.flowi6_oif = dev->ifindex;
472 fl->u.ip6.flowi6_flags |= FLOWI_FLAG_ANYSRC;
473 dst = ip6_route_output(dev_net(dev), NULL, &fl->u.ip6);
474 if (dst->error) {
475 dst_release(dst);
476 dst = NULL;
477 goto tx_err_link_failure;
478 }
479 skb_dst_set(skb, dst);
480 break;
481 default:
482 goto tx_err_link_failure;
483 }
484 }
485
486 dst_hold(dst);
487 dst = xfrm_lookup_route(t->net, dst, fl, NULL, 0);
488 if (IS_ERR(dst)) {
489 err = PTR_ERR(dst);
490 dst = NULL;
491 goto tx_err_link_failure;
492 }
493
494 if (dst->flags & DST_XFRM_QUEUE)
495 goto queued;
496
497 x = dst->xfrm;
498 if (!vti6_state_check(x, &t->parms.raddr, &t->parms.laddr))
499 goto tx_err_link_failure;
500
501 if (!ip6_tnl_xmit_ctl(t, (const struct in6_addr *)&x->props.saddr,
502 (const struct in6_addr *)&x->id.daddr))
503 goto tx_err_link_failure;
504
505 tdev = dst->dev;
506
507 if (tdev == dev) {
508 stats->collisions++;
509 net_warn_ratelimited("%s: Local routing loop detected!\n",
510 t->parms.name);
511 goto tx_err_dst_release;
512 }
513
514 mtu = dst_mtu(dst);
515 if (skb->len > mtu) {
516 skb_dst_update_pmtu_no_confirm(skb, mtu);
517
518 if (skb->protocol == htons(ETH_P_IPV6)) {
519 if (mtu < IPV6_MIN_MTU)
520 mtu = IPV6_MIN_MTU;
521
522 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
523 } else {
524 icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
525 htonl(mtu));
526 }
527
528 err = -EMSGSIZE;
529 goto tx_err_dst_release;
530 }
531
532 queued:
533 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
534 skb_dst_set(skb, dst);
535 skb->dev = skb_dst(skb)->dev;
536
537 err = dst_output(t->net, skb->sk, skb);
538 if (net_xmit_eval(err) == 0)
539 err = pkt_len;
540 iptunnel_xmit_stats(dev, err);
541
542 return 0;
543 tx_err_link_failure:
544 stats->tx_carrier_errors++;
545 dst_link_failure(skb);
546 tx_err_dst_release:
547 dst_release(dst);
548 return err;
549 }
550
551 static netdev_tx_t
vti6_tnl_xmit(struct sk_buff * skb,struct net_device * dev)552 vti6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
553 {
554 struct ip6_tnl *t = netdev_priv(dev);
555 struct net_device_stats *stats = &t->dev->stats;
556 struct flowi fl;
557 int ret;
558
559 if (!pskb_inet_may_pull(skb))
560 goto tx_err;
561
562 memset(&fl, 0, sizeof(fl));
563
564 switch (skb->protocol) {
565 case htons(ETH_P_IPV6):
566 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
567 vti6_addr_conflict(t, ipv6_hdr(skb)))
568 goto tx_err;
569
570 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
571 xfrm_decode_session(skb, &fl, AF_INET6);
572 break;
573 case htons(ETH_P_IP):
574 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
575 xfrm_decode_session(skb, &fl, AF_INET);
576 break;
577 default:
578 goto tx_err;
579 }
580
581 /* override mark with tunnel output key */
582 fl.flowi_mark = be32_to_cpu(t->parms.o_key);
583
584 ret = vti6_xmit(skb, dev, &fl);
585 if (ret < 0)
586 goto tx_err;
587
588 return NETDEV_TX_OK;
589
590 tx_err:
591 stats->tx_errors++;
592 stats->tx_dropped++;
593 kfree_skb(skb);
594 return NETDEV_TX_OK;
595 }
596
vti6_err(struct sk_buff * skb,struct inet6_skb_parm * opt,u8 type,u8 code,int offset,__be32 info)597 static int vti6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
598 u8 type, u8 code, int offset, __be32 info)
599 {
600 __be32 spi;
601 __u32 mark;
602 struct xfrm_state *x;
603 struct ip6_tnl *t;
604 struct ip_esp_hdr *esph;
605 struct ip_auth_hdr *ah;
606 struct ip_comp_hdr *ipch;
607 struct net *net = dev_net(skb->dev);
608 const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
609 int protocol = iph->nexthdr;
610
611 t = vti6_tnl_lookup(dev_net(skb->dev), &iph->daddr, &iph->saddr);
612 if (!t)
613 return -1;
614
615 mark = be32_to_cpu(t->parms.o_key);
616
617 switch (protocol) {
618 case IPPROTO_ESP:
619 esph = (struct ip_esp_hdr *)(skb->data + offset);
620 spi = esph->spi;
621 break;
622 case IPPROTO_AH:
623 ah = (struct ip_auth_hdr *)(skb->data + offset);
624 spi = ah->spi;
625 break;
626 case IPPROTO_COMP:
627 ipch = (struct ip_comp_hdr *)(skb->data + offset);
628 spi = htonl(ntohs(ipch->cpi));
629 break;
630 default:
631 return 0;
632 }
633
634 if (type != ICMPV6_PKT_TOOBIG &&
635 type != NDISC_REDIRECT)
636 return 0;
637
638 x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
639 spi, protocol, AF_INET6);
640 if (!x)
641 return 0;
642
643 if (type == NDISC_REDIRECT)
644 ip6_redirect(skb, net, skb->dev->ifindex, 0,
645 sock_net_uid(net, NULL));
646 else
647 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
648 xfrm_state_put(x);
649
650 return 0;
651 }
652
vti6_link_config(struct ip6_tnl * t,bool keep_mtu)653 static void vti6_link_config(struct ip6_tnl *t, bool keep_mtu)
654 {
655 struct net_device *dev = t->dev;
656 struct __ip6_tnl_parm *p = &t->parms;
657 struct net_device *tdev = NULL;
658 int mtu;
659
660 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
661 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
662
663 p->flags &= ~(IP6_TNL_F_CAP_XMIT | IP6_TNL_F_CAP_RCV |
664 IP6_TNL_F_CAP_PER_PACKET);
665 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
666
667 if (p->flags & IP6_TNL_F_CAP_XMIT && p->flags & IP6_TNL_F_CAP_RCV)
668 dev->flags |= IFF_POINTOPOINT;
669 else
670 dev->flags &= ~IFF_POINTOPOINT;
671
672 if (keep_mtu && dev->mtu) {
673 dev->mtu = clamp(dev->mtu, dev->min_mtu, dev->max_mtu);
674 return;
675 }
676
677 if (p->flags & IP6_TNL_F_CAP_XMIT) {
678 int strict = (ipv6_addr_type(&p->raddr) &
679 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL));
680 struct rt6_info *rt = rt6_lookup(t->net,
681 &p->raddr, &p->laddr,
682 p->link, NULL, strict);
683
684 if (rt)
685 tdev = rt->dst.dev;
686 ip6_rt_put(rt);
687 }
688
689 if (!tdev && p->link)
690 tdev = __dev_get_by_index(t->net, p->link);
691
692 if (tdev)
693 mtu = tdev->mtu - sizeof(struct ipv6hdr);
694 else
695 mtu = ETH_DATA_LEN - LL_MAX_HEADER - sizeof(struct ipv6hdr);
696
697 dev->mtu = max_t(int, mtu, IPV4_MIN_MTU);
698 }
699
700 /**
701 * vti6_tnl_change - update the tunnel parameters
702 * @t: tunnel to be changed
703 * @p: tunnel configuration parameters
704 * @keep_mtu: MTU was set from userspace, don't re-compute it
705 *
706 * Description:
707 * vti6_tnl_change() updates the tunnel parameters
708 **/
709 static int
vti6_tnl_change(struct ip6_tnl * t,const struct __ip6_tnl_parm * p,bool keep_mtu)710 vti6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
711 bool keep_mtu)
712 {
713 t->parms.laddr = p->laddr;
714 t->parms.raddr = p->raddr;
715 t->parms.link = p->link;
716 t->parms.i_key = p->i_key;
717 t->parms.o_key = p->o_key;
718 t->parms.proto = p->proto;
719 t->parms.fwmark = p->fwmark;
720 dst_cache_reset(&t->dst_cache);
721 vti6_link_config(t, keep_mtu);
722 return 0;
723 }
724
vti6_update(struct ip6_tnl * t,struct __ip6_tnl_parm * p,bool keep_mtu)725 static int vti6_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p,
726 bool keep_mtu)
727 {
728 struct net *net = dev_net(t->dev);
729 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
730 int err;
731
732 vti6_tnl_unlink(ip6n, t);
733 synchronize_net();
734 err = vti6_tnl_change(t, p, keep_mtu);
735 vti6_tnl_link(ip6n, t);
736 netdev_state_change(t->dev);
737 return err;
738 }
739
740 static void
vti6_parm_from_user(struct __ip6_tnl_parm * p,const struct ip6_tnl_parm2 * u)741 vti6_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm2 *u)
742 {
743 p->laddr = u->laddr;
744 p->raddr = u->raddr;
745 p->link = u->link;
746 p->i_key = u->i_key;
747 p->o_key = u->o_key;
748 p->proto = u->proto;
749
750 memcpy(p->name, u->name, sizeof(u->name));
751 }
752
753 static void
vti6_parm_to_user(struct ip6_tnl_parm2 * u,const struct __ip6_tnl_parm * p)754 vti6_parm_to_user(struct ip6_tnl_parm2 *u, const struct __ip6_tnl_parm *p)
755 {
756 u->laddr = p->laddr;
757 u->raddr = p->raddr;
758 u->link = p->link;
759 u->i_key = p->i_key;
760 u->o_key = p->o_key;
761 if (u->i_key)
762 u->i_flags |= GRE_KEY;
763 if (u->o_key)
764 u->o_flags |= GRE_KEY;
765 u->proto = p->proto;
766
767 memcpy(u->name, p->name, sizeof(u->name));
768 }
769
770 /**
771 * vti6_ioctl - configure vti6 tunnels from userspace
772 * @dev: virtual device associated with tunnel
773 * @ifr: parameters passed from userspace
774 * @cmd: command to be performed
775 *
776 * Description:
777 * vti6_ioctl() is used for managing vti6 tunnels
778 * from userspace.
779 *
780 * The possible commands are the following:
781 * %SIOCGETTUNNEL: get tunnel parameters for device
782 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
783 * %SIOCCHGTUNNEL: change tunnel parameters to those given
784 * %SIOCDELTUNNEL: delete tunnel
785 *
786 * The fallback device "ip6_vti0", created during module
787 * initialization, can be used for creating other tunnel devices.
788 *
789 * Return:
790 * 0 on success,
791 * %-EFAULT if unable to copy data to or from userspace,
792 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
793 * %-EINVAL if passed tunnel parameters are invalid,
794 * %-EEXIST if changing a tunnel's parameters would cause a conflict
795 * %-ENODEV if attempting to change or delete a nonexisting device
796 **/
797 static int
vti6_ioctl(struct net_device * dev,struct ifreq * ifr,int cmd)798 vti6_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
799 {
800 int err = 0;
801 struct ip6_tnl_parm2 p;
802 struct __ip6_tnl_parm p1;
803 struct ip6_tnl *t = NULL;
804 struct net *net = dev_net(dev);
805 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
806
807 memset(&p1, 0, sizeof(p1));
808
809 switch (cmd) {
810 case SIOCGETTUNNEL:
811 if (dev == ip6n->fb_tnl_dev) {
812 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
813 err = -EFAULT;
814 break;
815 }
816 vti6_parm_from_user(&p1, &p);
817 t = vti6_locate(net, &p1, 0);
818 } else {
819 memset(&p, 0, sizeof(p));
820 }
821 if (!t)
822 t = netdev_priv(dev);
823 vti6_parm_to_user(&p, &t->parms);
824 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
825 err = -EFAULT;
826 break;
827 case SIOCADDTUNNEL:
828 case SIOCCHGTUNNEL:
829 err = -EPERM;
830 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
831 break;
832 err = -EFAULT;
833 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
834 break;
835 err = -EINVAL;
836 if (p.proto != IPPROTO_IPV6 && p.proto != 0)
837 break;
838 vti6_parm_from_user(&p1, &p);
839 t = vti6_locate(net, &p1, cmd == SIOCADDTUNNEL);
840 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
841 if (t) {
842 if (t->dev != dev) {
843 err = -EEXIST;
844 break;
845 }
846 } else
847 t = netdev_priv(dev);
848
849 err = vti6_update(t, &p1, false);
850 }
851 if (t) {
852 err = 0;
853 vti6_parm_to_user(&p, &t->parms);
854 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
855 err = -EFAULT;
856
857 } else
858 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
859 break;
860 case SIOCDELTUNNEL:
861 err = -EPERM;
862 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
863 break;
864
865 if (dev == ip6n->fb_tnl_dev) {
866 err = -EFAULT;
867 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
868 break;
869 err = -ENOENT;
870 vti6_parm_from_user(&p1, &p);
871 t = vti6_locate(net, &p1, 0);
872 if (!t)
873 break;
874 err = -EPERM;
875 if (t->dev == ip6n->fb_tnl_dev)
876 break;
877 dev = t->dev;
878 }
879 err = 0;
880 unregister_netdevice(dev);
881 break;
882 default:
883 err = -EINVAL;
884 }
885 return err;
886 }
887
888 static const struct net_device_ops vti6_netdev_ops = {
889 .ndo_init = vti6_dev_init,
890 .ndo_uninit = vti6_dev_uninit,
891 .ndo_start_xmit = vti6_tnl_xmit,
892 .ndo_do_ioctl = vti6_ioctl,
893 .ndo_get_stats64 = ip_tunnel_get_stats64,
894 .ndo_get_iflink = ip6_tnl_get_iflink,
895 };
896
897 /**
898 * vti6_dev_setup - setup virtual tunnel device
899 * @dev: virtual device associated with tunnel
900 *
901 * Description:
902 * Initialize function pointers and device parameters
903 **/
vti6_dev_setup(struct net_device * dev)904 static void vti6_dev_setup(struct net_device *dev)
905 {
906 dev->netdev_ops = &vti6_netdev_ops;
907 dev->header_ops = &ip_tunnel_header_ops;
908 dev->needs_free_netdev = true;
909 dev->priv_destructor = vti6_dev_free;
910
911 dev->type = ARPHRD_TUNNEL6;
912 dev->min_mtu = IPV4_MIN_MTU;
913 dev->max_mtu = IP_MAX_MTU - sizeof(struct ipv6hdr);
914 dev->flags |= IFF_NOARP;
915 dev->addr_len = sizeof(struct in6_addr);
916 netif_keep_dst(dev);
917 /* This perm addr will be used as interface identifier by IPv6 */
918 dev->addr_assign_type = NET_ADDR_RANDOM;
919 eth_random_addr(dev->perm_addr);
920 }
921
922 /**
923 * vti6_dev_init_gen - general initializer for all tunnel devices
924 * @dev: virtual device associated with tunnel
925 **/
vti6_dev_init_gen(struct net_device * dev)926 static inline int vti6_dev_init_gen(struct net_device *dev)
927 {
928 struct ip6_tnl *t = netdev_priv(dev);
929
930 t->dev = dev;
931 t->net = dev_net(dev);
932 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
933 if (!dev->tstats)
934 return -ENOMEM;
935 dev_hold(dev);
936 return 0;
937 }
938
939 /**
940 * vti6_dev_init - initializer for all non fallback tunnel devices
941 * @dev: virtual device associated with tunnel
942 **/
vti6_dev_init(struct net_device * dev)943 static int vti6_dev_init(struct net_device *dev)
944 {
945 struct ip6_tnl *t = netdev_priv(dev);
946 int err = vti6_dev_init_gen(dev);
947
948 if (err)
949 return err;
950 vti6_link_config(t, true);
951 return 0;
952 }
953
954 /**
955 * vti6_fb_tnl_dev_init - initializer for fallback tunnel device
956 * @dev: fallback device
957 *
958 * Return: 0
959 **/
vti6_fb_tnl_dev_init(struct net_device * dev)960 static int __net_init vti6_fb_tnl_dev_init(struct net_device *dev)
961 {
962 struct ip6_tnl *t = netdev_priv(dev);
963 struct net *net = dev_net(dev);
964 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
965
966 t->parms.proto = IPPROTO_IPV6;
967
968 rcu_assign_pointer(ip6n->tnls_wc[0], t);
969 return 0;
970 }
971
vti6_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)972 static int vti6_validate(struct nlattr *tb[], struct nlattr *data[],
973 struct netlink_ext_ack *extack)
974 {
975 return 0;
976 }
977
vti6_netlink_parms(struct nlattr * data[],struct __ip6_tnl_parm * parms)978 static void vti6_netlink_parms(struct nlattr *data[],
979 struct __ip6_tnl_parm *parms)
980 {
981 memset(parms, 0, sizeof(*parms));
982
983 if (!data)
984 return;
985
986 if (data[IFLA_VTI_LINK])
987 parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
988
989 if (data[IFLA_VTI_LOCAL])
990 parms->laddr = nla_get_in6_addr(data[IFLA_VTI_LOCAL]);
991
992 if (data[IFLA_VTI_REMOTE])
993 parms->raddr = nla_get_in6_addr(data[IFLA_VTI_REMOTE]);
994
995 if (data[IFLA_VTI_IKEY])
996 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
997
998 if (data[IFLA_VTI_OKEY])
999 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
1000
1001 if (data[IFLA_VTI_FWMARK])
1002 parms->fwmark = nla_get_u32(data[IFLA_VTI_FWMARK]);
1003 }
1004
vti6_newlink(struct net * src_net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1005 static int vti6_newlink(struct net *src_net, struct net_device *dev,
1006 struct nlattr *tb[], struct nlattr *data[],
1007 struct netlink_ext_ack *extack)
1008 {
1009 struct net *net = dev_net(dev);
1010 struct ip6_tnl *nt;
1011
1012 nt = netdev_priv(dev);
1013 vti6_netlink_parms(data, &nt->parms);
1014
1015 nt->parms.proto = IPPROTO_IPV6;
1016
1017 if (vti6_locate(net, &nt->parms, 0))
1018 return -EEXIST;
1019
1020 return vti6_tnl_create2(dev);
1021 }
1022
vti6_dellink(struct net_device * dev,struct list_head * head)1023 static void vti6_dellink(struct net_device *dev, struct list_head *head)
1024 {
1025 struct net *net = dev_net(dev);
1026 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1027
1028 if (dev != ip6n->fb_tnl_dev)
1029 unregister_netdevice_queue(dev, head);
1030 }
1031
vti6_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1032 static int vti6_changelink(struct net_device *dev, struct nlattr *tb[],
1033 struct nlattr *data[],
1034 struct netlink_ext_ack *extack)
1035 {
1036 struct ip6_tnl *t;
1037 struct __ip6_tnl_parm p;
1038 struct net *net = dev_net(dev);
1039 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1040
1041 if (dev == ip6n->fb_tnl_dev)
1042 return -EINVAL;
1043
1044 vti6_netlink_parms(data, &p);
1045
1046 t = vti6_locate(net, &p, 0);
1047
1048 if (t) {
1049 if (t->dev != dev)
1050 return -EEXIST;
1051 } else
1052 t = netdev_priv(dev);
1053
1054 return vti6_update(t, &p, tb && tb[IFLA_MTU]);
1055 }
1056
vti6_get_size(const struct net_device * dev)1057 static size_t vti6_get_size(const struct net_device *dev)
1058 {
1059 return
1060 /* IFLA_VTI_LINK */
1061 nla_total_size(4) +
1062 /* IFLA_VTI_LOCAL */
1063 nla_total_size(sizeof(struct in6_addr)) +
1064 /* IFLA_VTI_REMOTE */
1065 nla_total_size(sizeof(struct in6_addr)) +
1066 /* IFLA_VTI_IKEY */
1067 nla_total_size(4) +
1068 /* IFLA_VTI_OKEY */
1069 nla_total_size(4) +
1070 /* IFLA_VTI_FWMARK */
1071 nla_total_size(4) +
1072 0;
1073 }
1074
vti6_fill_info(struct sk_buff * skb,const struct net_device * dev)1075 static int vti6_fill_info(struct sk_buff *skb, const struct net_device *dev)
1076 {
1077 struct ip6_tnl *tunnel = netdev_priv(dev);
1078 struct __ip6_tnl_parm *parm = &tunnel->parms;
1079
1080 if (nla_put_u32(skb, IFLA_VTI_LINK, parm->link) ||
1081 nla_put_in6_addr(skb, IFLA_VTI_LOCAL, &parm->laddr) ||
1082 nla_put_in6_addr(skb, IFLA_VTI_REMOTE, &parm->raddr) ||
1083 nla_put_be32(skb, IFLA_VTI_IKEY, parm->i_key) ||
1084 nla_put_be32(skb, IFLA_VTI_OKEY, parm->o_key) ||
1085 nla_put_u32(skb, IFLA_VTI_FWMARK, parm->fwmark))
1086 goto nla_put_failure;
1087 return 0;
1088
1089 nla_put_failure:
1090 return -EMSGSIZE;
1091 }
1092
1093 static const struct nla_policy vti6_policy[IFLA_VTI_MAX + 1] = {
1094 [IFLA_VTI_LINK] = { .type = NLA_U32 },
1095 [IFLA_VTI_LOCAL] = { .len = sizeof(struct in6_addr) },
1096 [IFLA_VTI_REMOTE] = { .len = sizeof(struct in6_addr) },
1097 [IFLA_VTI_IKEY] = { .type = NLA_U32 },
1098 [IFLA_VTI_OKEY] = { .type = NLA_U32 },
1099 [IFLA_VTI_FWMARK] = { .type = NLA_U32 },
1100 };
1101
1102 static struct rtnl_link_ops vti6_link_ops __read_mostly = {
1103 .kind = "vti6",
1104 .maxtype = IFLA_VTI_MAX,
1105 .policy = vti6_policy,
1106 .priv_size = sizeof(struct ip6_tnl),
1107 .setup = vti6_dev_setup,
1108 .validate = vti6_validate,
1109 .newlink = vti6_newlink,
1110 .dellink = vti6_dellink,
1111 .changelink = vti6_changelink,
1112 .get_size = vti6_get_size,
1113 .fill_info = vti6_fill_info,
1114 .get_link_net = ip6_tnl_get_link_net,
1115 };
1116
vti6_destroy_tunnels(struct vti6_net * ip6n,struct list_head * list)1117 static void __net_exit vti6_destroy_tunnels(struct vti6_net *ip6n,
1118 struct list_head *list)
1119 {
1120 int h;
1121 struct ip6_tnl *t;
1122
1123 for (h = 0; h < IP6_VTI_HASH_SIZE; h++) {
1124 t = rtnl_dereference(ip6n->tnls_r_l[h]);
1125 while (t) {
1126 unregister_netdevice_queue(t->dev, list);
1127 t = rtnl_dereference(t->next);
1128 }
1129 }
1130
1131 t = rtnl_dereference(ip6n->tnls_wc[0]);
1132 if (t)
1133 unregister_netdevice_queue(t->dev, list);
1134 }
1135
vti6_init_net(struct net * net)1136 static int __net_init vti6_init_net(struct net *net)
1137 {
1138 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1139 struct ip6_tnl *t = NULL;
1140 int err;
1141
1142 ip6n->tnls[0] = ip6n->tnls_wc;
1143 ip6n->tnls[1] = ip6n->tnls_r_l;
1144
1145 if (!net_has_fallback_tunnels(net))
1146 return 0;
1147 err = -ENOMEM;
1148 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6_vti0",
1149 NET_NAME_UNKNOWN, vti6_dev_setup);
1150
1151 if (!ip6n->fb_tnl_dev)
1152 goto err_alloc_dev;
1153 dev_net_set(ip6n->fb_tnl_dev, net);
1154 ip6n->fb_tnl_dev->rtnl_link_ops = &vti6_link_ops;
1155
1156 err = vti6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1157 if (err < 0)
1158 goto err_register;
1159
1160 err = register_netdev(ip6n->fb_tnl_dev);
1161 if (err < 0)
1162 goto err_register;
1163
1164 t = netdev_priv(ip6n->fb_tnl_dev);
1165
1166 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
1167 return 0;
1168
1169 err_register:
1170 free_netdev(ip6n->fb_tnl_dev);
1171 err_alloc_dev:
1172 return err;
1173 }
1174
vti6_exit_batch_net(struct list_head * net_list)1175 static void __net_exit vti6_exit_batch_net(struct list_head *net_list)
1176 {
1177 struct vti6_net *ip6n;
1178 struct net *net;
1179 LIST_HEAD(list);
1180
1181 rtnl_lock();
1182 list_for_each_entry(net, net_list, exit_list) {
1183 ip6n = net_generic(net, vti6_net_id);
1184 vti6_destroy_tunnels(ip6n, &list);
1185 }
1186 unregister_netdevice_many(&list);
1187 rtnl_unlock();
1188 }
1189
1190 static struct pernet_operations vti6_net_ops = {
1191 .init = vti6_init_net,
1192 .exit_batch = vti6_exit_batch_net,
1193 .id = &vti6_net_id,
1194 .size = sizeof(struct vti6_net),
1195 };
1196
1197 static struct xfrm6_protocol vti_esp6_protocol __read_mostly = {
1198 .handler = vti6_rcv,
1199 .input_handler = vti6_input_proto,
1200 .cb_handler = vti6_rcv_cb,
1201 .err_handler = vti6_err,
1202 .priority = 100,
1203 };
1204
1205 static struct xfrm6_protocol vti_ah6_protocol __read_mostly = {
1206 .handler = vti6_rcv,
1207 .input_handler = vti6_input_proto,
1208 .cb_handler = vti6_rcv_cb,
1209 .err_handler = vti6_err,
1210 .priority = 100,
1211 };
1212
1213 static struct xfrm6_protocol vti_ipcomp6_protocol __read_mostly = {
1214 .handler = vti6_rcv,
1215 .input_handler = vti6_input_proto,
1216 .cb_handler = vti6_rcv_cb,
1217 .err_handler = vti6_err,
1218 .priority = 100,
1219 };
1220
1221 #if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
vti6_rcv_tunnel(struct sk_buff * skb)1222 static int vti6_rcv_tunnel(struct sk_buff *skb)
1223 {
1224 const xfrm_address_t *saddr;
1225 __be32 spi;
1226
1227 saddr = (const xfrm_address_t *)&ipv6_hdr(skb)->saddr;
1228 spi = xfrm6_tunnel_spi_lookup(dev_net(skb->dev), saddr);
1229
1230 return vti6_input_proto(skb, IPPROTO_IPV6, spi, 0);
1231 }
1232
1233 static struct xfrm6_tunnel vti_ipv6_handler __read_mostly = {
1234 .handler = vti6_rcv_tunnel,
1235 .cb_handler = vti6_rcv_cb,
1236 .err_handler = vti6_err,
1237 .priority = 0,
1238 };
1239
1240 static struct xfrm6_tunnel vti_ip6ip_handler __read_mostly = {
1241 .handler = vti6_rcv_tunnel,
1242 .cb_handler = vti6_rcv_cb,
1243 .err_handler = vti6_err,
1244 .priority = 0,
1245 };
1246 #endif
1247
1248 /**
1249 * vti6_tunnel_init - register protocol and reserve needed resources
1250 *
1251 * Return: 0 on success
1252 **/
vti6_tunnel_init(void)1253 static int __init vti6_tunnel_init(void)
1254 {
1255 const char *msg;
1256 int err;
1257
1258 msg = "tunnel device";
1259 err = register_pernet_device(&vti6_net_ops);
1260 if (err < 0)
1261 goto pernet_dev_failed;
1262
1263 msg = "tunnel protocols";
1264 err = xfrm6_protocol_register(&vti_esp6_protocol, IPPROTO_ESP);
1265 if (err < 0)
1266 goto xfrm_proto_esp_failed;
1267 err = xfrm6_protocol_register(&vti_ah6_protocol, IPPROTO_AH);
1268 if (err < 0)
1269 goto xfrm_proto_ah_failed;
1270 err = xfrm6_protocol_register(&vti_ipcomp6_protocol, IPPROTO_COMP);
1271 if (err < 0)
1272 goto xfrm_proto_comp_failed;
1273 #if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
1274 msg = "ipv6 tunnel";
1275 err = xfrm6_tunnel_register(&vti_ipv6_handler, AF_INET6);
1276 if (err < 0)
1277 goto vti_tunnel_ipv6_failed;
1278 err = xfrm6_tunnel_register(&vti_ip6ip_handler, AF_INET);
1279 if (err < 0)
1280 goto vti_tunnel_ip6ip_failed;
1281 #endif
1282
1283 msg = "netlink interface";
1284 err = rtnl_link_register(&vti6_link_ops);
1285 if (err < 0)
1286 goto rtnl_link_failed;
1287
1288 return 0;
1289
1290 rtnl_link_failed:
1291 #if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
1292 err = xfrm6_tunnel_deregister(&vti_ip6ip_handler, AF_INET);
1293 vti_tunnel_ip6ip_failed:
1294 err = xfrm6_tunnel_deregister(&vti_ipv6_handler, AF_INET6);
1295 vti_tunnel_ipv6_failed:
1296 #endif
1297 xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1298 xfrm_proto_comp_failed:
1299 xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1300 xfrm_proto_ah_failed:
1301 xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1302 xfrm_proto_esp_failed:
1303 unregister_pernet_device(&vti6_net_ops);
1304 pernet_dev_failed:
1305 pr_err("vti6 init: failed to register %s\n", msg);
1306 return err;
1307 }
1308
1309 /**
1310 * vti6_tunnel_cleanup - free resources and unregister protocol
1311 **/
vti6_tunnel_cleanup(void)1312 static void __exit vti6_tunnel_cleanup(void)
1313 {
1314 rtnl_link_unregister(&vti6_link_ops);
1315 #if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
1316 xfrm6_tunnel_deregister(&vti_ip6ip_handler, AF_INET);
1317 xfrm6_tunnel_deregister(&vti_ipv6_handler, AF_INET6);
1318 #endif
1319 xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1320 xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1321 xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1322 unregister_pernet_device(&vti6_net_ops);
1323 }
1324
1325 module_init(vti6_tunnel_init);
1326 module_exit(vti6_tunnel_cleanup);
1327 MODULE_LICENSE("GPL");
1328 MODULE_ALIAS_RTNL_LINK("vti6");
1329 MODULE_ALIAS_NETDEV("ip6_vti0");
1330 MODULE_AUTHOR("Steffen Klassert");
1331 MODULE_DESCRIPTION("IPv6 virtual tunnel interface");
1332