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 <net/netdev_lock.h>
49 #include <linux/etherdevice.h>
50
51 #define IP6_VTI_HASH_SIZE_SHIFT 5
52 #define IP6_VTI_HASH_SIZE (1 << IP6_VTI_HASH_SIZE_SHIFT)
53
HASH(const struct in6_addr * addr1,const struct in6_addr * addr2)54 static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
55 {
56 u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
57
58 return hash_32(hash, IP6_VTI_HASH_SIZE_SHIFT);
59 }
60
61 static int vti6_dev_init(struct net_device *dev);
62 static void vti6_dev_setup(struct net_device *dev);
63 static struct rtnl_link_ops vti6_link_ops __read_mostly;
64
65 static unsigned int vti6_net_id __read_mostly;
66 struct vti6_net {
67 /* the vti6 tunnel fallback device */
68 struct net_device *fb_tnl_dev;
69 /* lists for storing tunnels in use */
70 struct ip6_tnl __rcu *tnls_r_l[IP6_VTI_HASH_SIZE];
71 struct ip6_tnl __rcu *tnls_wc[1];
72 struct ip6_tnl __rcu **tnls[2];
73 };
74
75 #define for_each_vti6_tunnel_rcu(start) \
76 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
77
78 /**
79 * vti6_tnl_lookup - fetch tunnel matching the end-point addresses
80 * @net: network namespace
81 * @remote: the address of the tunnel exit-point
82 * @local: the address of the tunnel entry-point
83 *
84 * Return:
85 * tunnel matching given end-points if found,
86 * else fallback tunnel if its device is up,
87 * else %NULL
88 **/
89 static struct ip6_tnl *
vti6_tnl_lookup(struct net * net,const struct in6_addr * remote,const struct in6_addr * local)90 vti6_tnl_lookup(struct net *net, const struct in6_addr *remote,
91 const struct in6_addr *local)
92 {
93 unsigned int hash = HASH(remote, local);
94 struct ip6_tnl *t;
95 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
96 struct in6_addr any;
97
98 for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
99 if (ipv6_addr_equal(local, &t->parms.laddr) &&
100 ipv6_addr_equal(remote, &t->parms.raddr) &&
101 (t->dev->flags & IFF_UP))
102 return t;
103 }
104
105 memset(&any, 0, sizeof(any));
106 hash = HASH(&any, local);
107 for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
108 if (ipv6_addr_equal(local, &t->parms.laddr) &&
109 (t->dev->flags & IFF_UP))
110 return t;
111 }
112
113 hash = HASH(remote, &any);
114 for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
115 if (ipv6_addr_equal(remote, &t->parms.raddr) &&
116 (t->dev->flags & IFF_UP))
117 return t;
118 }
119
120 t = rcu_dereference(ip6n->tnls_wc[0]);
121 if (t && (t->dev->flags & IFF_UP))
122 return t;
123
124 return NULL;
125 }
126
127 /**
128 * vti6_tnl_bucket - get head of list matching given tunnel parameters
129 * @ip6n: the private data for ip6_vti in the netns
130 * @p: parameters containing tunnel end-points
131 *
132 * Description:
133 * vti6_tnl_bucket() returns the head of the list matching the
134 * &struct in6_addr entries laddr and raddr in @p.
135 *
136 * Return: head of IPv6 tunnel list
137 **/
138 static struct ip6_tnl __rcu **
vti6_tnl_bucket(struct vti6_net * ip6n,const struct __ip6_tnl_parm * p)139 vti6_tnl_bucket(struct vti6_net *ip6n, const struct __ip6_tnl_parm *p)
140 {
141 const struct in6_addr *remote = &p->raddr;
142 const struct in6_addr *local = &p->laddr;
143 unsigned int h = 0;
144 int prio = 0;
145
146 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
147 prio = 1;
148 h = HASH(remote, local);
149 }
150 return &ip6n->tnls[prio][h];
151 }
152
153 static void
vti6_tnl_link(struct vti6_net * ip6n,struct ip6_tnl * t)154 vti6_tnl_link(struct vti6_net *ip6n, struct ip6_tnl *t)
155 {
156 struct ip6_tnl __rcu **tp = vti6_tnl_bucket(ip6n, &t->parms);
157
158 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
159 rcu_assign_pointer(*tp, t);
160 }
161
162 static void
vti6_tnl_unlink(struct vti6_net * ip6n,struct ip6_tnl * t)163 vti6_tnl_unlink(struct vti6_net *ip6n, struct ip6_tnl *t)
164 {
165 struct ip6_tnl __rcu **tp;
166 struct ip6_tnl *iter;
167
168 for (tp = vti6_tnl_bucket(ip6n, &t->parms);
169 (iter = rtnl_dereference(*tp)) != NULL;
170 tp = &iter->next) {
171 if (t == iter) {
172 rcu_assign_pointer(*tp, t->next);
173 break;
174 }
175 }
176 }
177
vti6_tnl_create2(struct net_device * dev)178 static int vti6_tnl_create2(struct net_device *dev)
179 {
180 struct ip6_tnl *t = netdev_priv(dev);
181 struct vti6_net *ip6n = net_generic(t->net, vti6_net_id);
182 int err;
183
184 dev->rtnl_link_ops = &vti6_link_ops;
185 err = register_netdevice(dev);
186 if (err < 0)
187 goto out;
188
189 strcpy(t->parms.name, dev->name);
190
191 vti6_tnl_link(ip6n, t);
192
193 return 0;
194
195 out:
196 return err;
197 }
198
vti6_tnl_create(struct net * net,struct __ip6_tnl_parm * p)199 static struct ip6_tnl *vti6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
200 {
201 struct net_device *dev;
202 struct ip6_tnl *t;
203 char name[IFNAMSIZ];
204 int err;
205
206 if (p->name[0]) {
207 if (!dev_valid_name(p->name))
208 goto failed;
209 strscpy(name, p->name, IFNAMSIZ);
210 } else {
211 sprintf(name, "ip6_vti%%d");
212 }
213
214 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, vti6_dev_setup);
215 if (!dev)
216 goto failed;
217
218 dev_net_set(dev, net);
219
220 t = netdev_priv(dev);
221 t->parms = *p;
222 t->net = dev_net(dev);
223
224 err = vti6_tnl_create2(dev);
225 if (err < 0)
226 goto failed_free;
227
228 return t;
229
230 failed_free:
231 free_netdev(dev);
232 failed:
233 return NULL;
234 }
235
236 /**
237 * vti6_locate - find or create tunnel matching given parameters
238 * @net: network namespace
239 * @p: tunnel parameters
240 * @create: != 0 if allowed to create new tunnel if no match found
241 *
242 * Description:
243 * vti6_locate() first tries to locate an existing tunnel
244 * based on @parms. If this is unsuccessful, but @create is set a new
245 * tunnel device is created and registered for use.
246 *
247 * Return:
248 * matching tunnel or NULL
249 **/
vti6_locate(struct net * net,struct __ip6_tnl_parm * p,int create)250 static struct ip6_tnl *vti6_locate(struct net *net, struct __ip6_tnl_parm *p,
251 int create)
252 {
253 const struct in6_addr *remote = &p->raddr;
254 const struct in6_addr *local = &p->laddr;
255 struct ip6_tnl __rcu **tp;
256 struct ip6_tnl *t;
257 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
258
259 for (tp = vti6_tnl_bucket(ip6n, p);
260 (t = rtnl_dereference(*tp)) != NULL;
261 tp = &t->next) {
262 if (ipv6_addr_equal(local, &t->parms.laddr) &&
263 ipv6_addr_equal(remote, &t->parms.raddr)) {
264 if (create)
265 return NULL;
266
267 return t;
268 }
269 }
270 if (!create)
271 return NULL;
272 return vti6_tnl_create(net, p);
273 }
274
275 /**
276 * vti6_dev_uninit - tunnel device uninitializer
277 * @dev: the device to be destroyed
278 *
279 * Description:
280 * vti6_dev_uninit() removes tunnel from its list
281 **/
vti6_dev_uninit(struct net_device * dev)282 static void vti6_dev_uninit(struct net_device *dev)
283 {
284 struct ip6_tnl *t = netdev_priv(dev);
285 struct vti6_net *ip6n = net_generic(t->net, vti6_net_id);
286
287 if (dev == ip6n->fb_tnl_dev)
288 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
289 else
290 vti6_tnl_unlink(ip6n, t);
291 netdev_put(dev, &t->dev_tracker);
292 }
293
vti6_input_proto(struct sk_buff * skb,int nexthdr,__be32 spi,int encap_type)294 static int vti6_input_proto(struct sk_buff *skb, int nexthdr, __be32 spi,
295 int encap_type)
296 {
297 struct ip6_tnl *t;
298 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
299
300 rcu_read_lock();
301 t = vti6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr);
302 if (t) {
303 if (t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) {
304 rcu_read_unlock();
305 goto discard;
306 }
307
308 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
309 rcu_read_unlock();
310 goto discard;
311 }
312
313 ipv6h = ipv6_hdr(skb);
314 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) {
315 DEV_STATS_INC(t->dev, rx_dropped);
316 rcu_read_unlock();
317 goto discard;
318 }
319
320 rcu_read_unlock();
321
322 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = t;
323 XFRM_SPI_SKB_CB(skb)->family = AF_INET6;
324 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr);
325 return xfrm_input(skb, nexthdr, spi, encap_type);
326 }
327 rcu_read_unlock();
328 return -EINVAL;
329 discard:
330 kfree_skb(skb);
331 return 0;
332 }
333
vti6_rcv(struct sk_buff * skb)334 static int vti6_rcv(struct sk_buff *skb)
335 {
336 int nexthdr = skb_network_header(skb)[IP6CB(skb)->nhoff];
337
338 return vti6_input_proto(skb, nexthdr, 0, 0);
339 }
340
vti6_rcv_cb(struct sk_buff * skb,int err)341 static int vti6_rcv_cb(struct sk_buff *skb, int err)
342 {
343 unsigned short family;
344 struct net_device *dev;
345 struct xfrm_state *x;
346 const struct xfrm_mode *inner_mode;
347 struct ip6_tnl *t = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6;
348 u32 orig_mark = skb->mark;
349 int ret;
350
351 if (!t)
352 return 1;
353
354 dev = t->dev;
355
356 if (err) {
357 DEV_STATS_INC(dev, rx_errors);
358 DEV_STATS_INC(dev, rx_dropped);
359
360 return 0;
361 }
362
363 x = xfrm_input_state(skb);
364
365 inner_mode = &x->inner_mode;
366
367 if (x->sel.family == AF_UNSPEC) {
368 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
369 if (inner_mode == NULL) {
370 XFRM_INC_STATS(dev_net(skb->dev),
371 LINUX_MIB_XFRMINSTATEMODEERROR);
372 return -EINVAL;
373 }
374 }
375
376 family = inner_mode->family;
377
378 skb->mark = be32_to_cpu(t->parms.i_key);
379 ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family);
380 skb->mark = orig_mark;
381
382 if (!ret)
383 return -EPERM;
384
385 skb_scrub_packet(skb, !net_eq(t->net, dev_net(skb->dev)));
386 skb->dev = dev;
387 dev_sw_netstats_rx_add(dev, skb->len);
388
389 return 0;
390 }
391
392 /**
393 * vti6_addr_conflict - compare packet addresses to tunnel's own
394 * @t: the outgoing tunnel device
395 * @hdr: IPv6 header from the incoming packet
396 *
397 * Description:
398 * Avoid trivial tunneling loop by checking that tunnel exit-point
399 * doesn't match source of incoming packet.
400 *
401 * Return:
402 * 1 if conflict,
403 * 0 else
404 **/
405 static inline bool
vti6_addr_conflict(const struct ip6_tnl * t,const struct ipv6hdr * hdr)406 vti6_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
407 {
408 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
409 }
410
vti6_state_check(const struct xfrm_state * x,const struct in6_addr * dst,const struct in6_addr * src)411 static bool vti6_state_check(const struct xfrm_state *x,
412 const struct in6_addr *dst,
413 const struct in6_addr *src)
414 {
415 xfrm_address_t *daddr = (xfrm_address_t *)dst;
416 xfrm_address_t *saddr = (xfrm_address_t *)src;
417
418 /* if there is no transform then this tunnel is not functional.
419 * Or if the xfrm is not mode tunnel.
420 */
421 if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
422 x->props.family != AF_INET6)
423 return false;
424
425 if (ipv6_addr_any(dst))
426 return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET6);
427
428 if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET6))
429 return false;
430
431 return true;
432 }
433
434 /**
435 * vti6_xmit - send a packet
436 * @skb: the outgoing socket buffer
437 * @dev: the outgoing tunnel device
438 * @fl: the flow informations for the xfrm_lookup
439 **/
440 static int
vti6_xmit(struct sk_buff * skb,struct net_device * dev,struct flowi * fl)441 vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
442 {
443 struct ip6_tnl *t = netdev_priv(dev);
444 struct dst_entry *dst = skb_dst(skb);
445 struct net_device *tdev;
446 struct xfrm_state *x;
447 int pkt_len = skb->len;
448 int err = -1;
449 int mtu;
450
451 if (!dst) {
452 switch (skb->protocol) {
453 case htons(ETH_P_IP): {
454 struct rtable *rt;
455
456 fl->u.ip4.flowi4_oif = dev->ifindex;
457 fl->u.ip4.flowi4_flags |= FLOWI_FLAG_ANYSRC;
458 rt = __ip_route_output_key(dev_net(dev), &fl->u.ip4);
459 if (IS_ERR(rt))
460 goto tx_err_link_failure;
461 dst = &rt->dst;
462 skb_dst_set(skb, dst);
463 break;
464 }
465 case htons(ETH_P_IPV6):
466 fl->u.ip6.flowi6_oif = dev->ifindex;
467 fl->u.ip6.flowi6_flags |= FLOWI_FLAG_ANYSRC;
468 dst = ip6_route_output(dev_net(dev), NULL, &fl->u.ip6);
469 if (dst->error) {
470 dst_release(dst);
471 dst = NULL;
472 goto tx_err_link_failure;
473 }
474 skb_dst_set(skb, dst);
475 break;
476 default:
477 goto tx_err_link_failure;
478 }
479 }
480
481 dst_hold(dst);
482 dst = xfrm_lookup_route(t->net, dst, fl, NULL, 0);
483 if (IS_ERR(dst)) {
484 err = PTR_ERR(dst);
485 dst = NULL;
486 goto tx_err_link_failure;
487 }
488
489 if (dst->flags & DST_XFRM_QUEUE)
490 goto xmit;
491
492 x = dst->xfrm;
493 if (!vti6_state_check(x, &t->parms.raddr, &t->parms.laddr))
494 goto tx_err_link_failure;
495
496 if (!ip6_tnl_xmit_ctl(t, (const struct in6_addr *)&x->props.saddr,
497 (const struct in6_addr *)&x->id.daddr))
498 goto tx_err_link_failure;
499
500 tdev = dst_dev(dst);
501
502 if (tdev == dev) {
503 DEV_STATS_INC(dev, collisions);
504 net_warn_ratelimited("%s: Local routing loop detected!\n",
505 t->parms.name);
506 goto tx_err_dst_release;
507 }
508
509 mtu = dst_mtu(dst);
510 if (skb->len > mtu) {
511 skb_dst_update_pmtu_no_confirm(skb, mtu);
512
513 if (skb->protocol == htons(ETH_P_IPV6)) {
514 if (mtu < IPV6_MIN_MTU)
515 mtu = IPV6_MIN_MTU;
516
517 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
518 } else {
519 if (!(ip_hdr(skb)->frag_off & htons(IP_DF)))
520 goto xmit;
521 icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
522 htonl(mtu));
523 }
524
525 err = -EMSGSIZE;
526 goto tx_err_dst_release;
527 }
528
529 xmit:
530 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
531 skb_dst_set(skb, dst);
532 skb->dev = dst_dev(dst);
533
534 err = dst_output(t->net, skb->sk, skb);
535 if (net_xmit_eval(err) == 0)
536 err = pkt_len;
537 iptunnel_xmit_stats(dev, err);
538
539 return 0;
540 tx_err_link_failure:
541 DEV_STATS_INC(dev, tx_carrier_errors);
542 dst_link_failure(skb);
543 tx_err_dst_release:
544 dst_release(dst);
545 return err;
546 }
547
548 static netdev_tx_t
vti6_tnl_xmit(struct sk_buff * skb,struct net_device * dev)549 vti6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
550 {
551 struct ip6_tnl *t = netdev_priv(dev);
552 struct flowi fl;
553 int ret;
554
555 if (!pskb_inet_may_pull(skb))
556 goto tx_err;
557
558 memset(&fl, 0, sizeof(fl));
559
560 switch (skb->protocol) {
561 case htons(ETH_P_IPV6):
562 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
563 vti6_addr_conflict(t, ipv6_hdr(skb)))
564 goto tx_err;
565
566 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
567 xfrm_decode_session(dev_net(dev), skb, &fl, AF_INET6);
568 break;
569 case htons(ETH_P_IP):
570 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
571 xfrm_decode_session(dev_net(dev), skb, &fl, AF_INET);
572 break;
573 default:
574 goto tx_err;
575 }
576
577 /* override mark with tunnel output key */
578 fl.flowi_mark = be32_to_cpu(t->parms.o_key);
579
580 ret = vti6_xmit(skb, dev, &fl);
581 if (ret < 0)
582 goto tx_err;
583
584 return NETDEV_TX_OK;
585
586 tx_err:
587 DEV_STATS_INC(dev, tx_errors);
588 DEV_STATS_INC(dev, tx_dropped);
589 kfree_skb(skb);
590 return NETDEV_TX_OK;
591 }
592
vti6_err(struct sk_buff * skb,struct inet6_skb_parm * opt,u8 type,u8 code,int offset,__be32 info)593 static int vti6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
594 u8 type, u8 code, int offset, __be32 info)
595 {
596 __be32 spi;
597 __u32 mark;
598 struct xfrm_state *x;
599 struct ip6_tnl *t;
600 struct ip_esp_hdr *esph;
601 struct ip_auth_hdr *ah;
602 struct ip_comp_hdr *ipch;
603 struct net *net = dev_net(skb->dev);
604 const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
605 int protocol = iph->nexthdr;
606
607 t = vti6_tnl_lookup(dev_net(skb->dev), &iph->daddr, &iph->saddr);
608 if (!t)
609 return -1;
610
611 mark = be32_to_cpu(t->parms.o_key);
612
613 switch (protocol) {
614 case IPPROTO_ESP:
615 esph = (struct ip_esp_hdr *)(skb->data + offset);
616 spi = esph->spi;
617 break;
618 case IPPROTO_AH:
619 ah = (struct ip_auth_hdr *)(skb->data + offset);
620 spi = ah->spi;
621 break;
622 case IPPROTO_COMP:
623 ipch = (struct ip_comp_hdr *)(skb->data + offset);
624 spi = htonl(ntohs(ipch->cpi));
625 break;
626 default:
627 return 0;
628 }
629
630 if (type != ICMPV6_PKT_TOOBIG &&
631 type != NDISC_REDIRECT)
632 return 0;
633
634 x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
635 spi, protocol, AF_INET6);
636 if (!x)
637 return 0;
638
639 if (type == NDISC_REDIRECT)
640 ip6_redirect(skb, net, skb->dev->ifindex, 0,
641 sock_net_uid(net, NULL));
642 else
643 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
644 xfrm_state_put(x);
645
646 return 0;
647 }
648
vti6_link_config(struct ip6_tnl * t,bool keep_mtu)649 static void vti6_link_config(struct ip6_tnl *t, bool keep_mtu)
650 {
651 struct net_device *dev = t->dev;
652 struct __ip6_tnl_parm *p = &t->parms;
653 struct net_device *tdev = NULL;
654 int mtu;
655
656 __dev_addr_set(dev, &p->laddr, sizeof(struct in6_addr));
657 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
658
659 p->flags &= ~(IP6_TNL_F_CAP_XMIT | IP6_TNL_F_CAP_RCV |
660 IP6_TNL_F_CAP_PER_PACKET);
661 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
662
663 if (p->flags & IP6_TNL_F_CAP_XMIT && p->flags & IP6_TNL_F_CAP_RCV)
664 dev->flags |= IFF_POINTOPOINT;
665 else
666 dev->flags &= ~IFF_POINTOPOINT;
667
668 if (keep_mtu && dev->mtu) {
669 WRITE_ONCE(dev->mtu,
670 clamp(dev->mtu, dev->min_mtu, dev->max_mtu));
671 return;
672 }
673
674 if (p->flags & IP6_TNL_F_CAP_XMIT) {
675 int strict = (ipv6_addr_type(&p->raddr) &
676 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL));
677 struct rt6_info *rt = rt6_lookup(t->net,
678 &p->raddr, &p->laddr,
679 p->link, NULL, strict);
680
681 if (rt)
682 tdev = rt->dst.dev;
683 ip6_rt_put(rt);
684 }
685
686 if (!tdev && p->link)
687 tdev = __dev_get_by_index(t->net, p->link);
688
689 if (tdev)
690 mtu = tdev->mtu - sizeof(struct ipv6hdr);
691 else
692 mtu = ETH_DATA_LEN - LL_MAX_HEADER - sizeof(struct ipv6hdr);
693
694 dev->mtu = max_t(int, mtu, IPV4_MIN_MTU);
695 }
696
697 /**
698 * vti6_tnl_change - update the tunnel parameters
699 * @t: tunnel to be changed
700 * @p: tunnel configuration parameters
701 * @keep_mtu: MTU was set from userspace, don't re-compute it
702 *
703 * Description:
704 * vti6_tnl_change() updates the tunnel parameters
705 **/
706 static int
vti6_tnl_change(struct ip6_tnl * t,const struct __ip6_tnl_parm * p,bool keep_mtu)707 vti6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
708 bool keep_mtu)
709 {
710 t->parms.laddr = p->laddr;
711 t->parms.raddr = p->raddr;
712 t->parms.link = p->link;
713 t->parms.i_key = p->i_key;
714 t->parms.o_key = p->o_key;
715 t->parms.proto = p->proto;
716 t->parms.fwmark = p->fwmark;
717 dst_cache_reset(&t->dst_cache);
718 vti6_link_config(t, keep_mtu);
719 return 0;
720 }
721
vti6_update(struct ip6_tnl * t,struct __ip6_tnl_parm * p,bool keep_mtu)722 static int vti6_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p,
723 bool keep_mtu)
724 {
725 struct net *net = t->net;
726 struct vti6_net *ip6n;
727 int err;
728
729 ip6n = net_generic(net, vti6_net_id);
730 vti6_tnl_unlink(ip6n, t);
731 synchronize_net();
732 err = vti6_tnl_change(t, p, keep_mtu);
733 vti6_tnl_link(ip6n, t);
734 netdev_state_change(t->dev);
735 return err;
736 }
737
738 static void
vti6_parm_from_user(struct __ip6_tnl_parm * p,const struct ip6_tnl_parm2 * u)739 vti6_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm2 *u)
740 {
741 p->laddr = u->laddr;
742 p->raddr = u->raddr;
743 p->link = u->link;
744 p->i_key = u->i_key;
745 p->o_key = u->o_key;
746 p->proto = u->proto;
747
748 memcpy(p->name, u->name, sizeof(u->name));
749 }
750
751 static void
vti6_parm_to_user(struct ip6_tnl_parm2 * u,const struct __ip6_tnl_parm * p)752 vti6_parm_to_user(struct ip6_tnl_parm2 *u, const struct __ip6_tnl_parm *p)
753 {
754 u->laddr = p->laddr;
755 u->raddr = p->raddr;
756 u->link = p->link;
757 u->i_key = p->i_key;
758 u->o_key = p->o_key;
759 if (u->i_key)
760 u->i_flags |= GRE_KEY;
761 if (u->o_key)
762 u->o_flags |= GRE_KEY;
763 u->proto = p->proto;
764
765 memcpy(u->name, p->name, sizeof(u->name));
766 }
767
768 /**
769 * vti6_siocdevprivate - configure vti6 tunnels from userspace
770 * @dev: virtual device associated with tunnel
771 * @ifr: unused
772 * @data: parameters passed from userspace
773 * @cmd: command to be performed
774 *
775 * Description:
776 * vti6_siocdevprivate() is used for managing vti6 tunnels
777 * from userspace.
778 *
779 * The possible commands are the following:
780 * %SIOCGETTUNNEL: get tunnel parameters for device
781 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
782 * %SIOCCHGTUNNEL: change tunnel parameters to those given
783 * %SIOCDELTUNNEL: delete tunnel
784 *
785 * The fallback device "ip6_vti0", created during module
786 * initialization, can be used for creating other tunnel devices.
787 *
788 * Return:
789 * 0 on success,
790 * %-EFAULT if unable to copy data to or from userspace,
791 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
792 * %-EINVAL if passed tunnel parameters are invalid,
793 * %-EEXIST if changing a tunnel's parameters would cause a conflict
794 * %-ENODEV if attempting to change or delete a nonexisting device
795 **/
796 static int
vti6_siocdevprivate(struct net_device * dev,struct ifreq * ifr,void __user * data,int cmd)797 vti6_siocdevprivate(struct net_device *dev, struct ifreq *ifr, void __user *data, int cmd)
798 {
799 int err = 0;
800 struct ip6_tnl_parm2 p;
801 struct __ip6_tnl_parm p1;
802 struct ip6_tnl *t = NULL;
803 struct net *net = dev_net(dev);
804 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
805
806 memset(&p1, 0, sizeof(p1));
807
808 switch (cmd) {
809 case SIOCGETTUNNEL:
810 if (dev == ip6n->fb_tnl_dev) {
811 if (copy_from_user(&p, data, sizeof(p))) {
812 err = -EFAULT;
813 break;
814 }
815 vti6_parm_from_user(&p1, &p);
816 t = vti6_locate(net, &p1, 0);
817 } else {
818 memset(&p, 0, sizeof(p));
819 }
820 if (!t)
821 t = netdev_priv(dev);
822 vti6_parm_to_user(&p, &t->parms);
823 if (copy_to_user(data, &p, sizeof(p)))
824 err = -EFAULT;
825 break;
826 case SIOCADDTUNNEL:
827 case SIOCCHGTUNNEL:
828 err = -EPERM;
829 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
830 break;
831 err = -EFAULT;
832 if (copy_from_user(&p, data, sizeof(p)))
833 break;
834 err = -EINVAL;
835 if (p.proto != IPPROTO_IPV6 && p.proto != 0)
836 break;
837 vti6_parm_from_user(&p1, &p);
838 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
839 struct ip6_tnl *self = netdev_priv(dev);
840
841 err = -EPERM;
842 if (!ns_capable(self->net->user_ns, CAP_NET_ADMIN))
843 break;
844 t = vti6_locate(self->net, &p1, false);
845 if (t) {
846 if (t->dev != dev) {
847 err = -EEXIST;
848 break;
849 }
850 } else
851 t = self;
852
853 err = vti6_update(t, &p1, false);
854 } else {
855 t = vti6_locate(net, &p1, cmd == SIOCADDTUNNEL);
856 }
857 if (t) {
858 err = 0;
859 vti6_parm_to_user(&p, &t->parms);
860 if (copy_to_user(data, &p, sizeof(p)))
861 err = -EFAULT;
862
863 } else
864 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
865 break;
866 case SIOCDELTUNNEL:
867 err = -EPERM;
868 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
869 break;
870
871 if (dev == ip6n->fb_tnl_dev) {
872 err = -EFAULT;
873 if (copy_from_user(&p, data, sizeof(p)))
874 break;
875 err = -ENOENT;
876 vti6_parm_from_user(&p1, &p);
877 t = vti6_locate(net, &p1, 0);
878 if (!t)
879 break;
880 err = -EPERM;
881 if (t->dev == ip6n->fb_tnl_dev)
882 break;
883 dev = t->dev;
884 }
885 err = 0;
886 unregister_netdevice(dev);
887 break;
888 default:
889 err = -EINVAL;
890 }
891 return err;
892 }
893
894 static const struct net_device_ops vti6_netdev_ops = {
895 .ndo_init = vti6_dev_init,
896 .ndo_uninit = vti6_dev_uninit,
897 .ndo_start_xmit = vti6_tnl_xmit,
898 .ndo_siocdevprivate = vti6_siocdevprivate,
899 .ndo_get_iflink = ip6_tnl_get_iflink,
900 };
901
902 /**
903 * vti6_dev_setup - setup virtual tunnel device
904 * @dev: virtual device associated with tunnel
905 *
906 * Description:
907 * Initialize function pointers and device parameters
908 **/
vti6_dev_setup(struct net_device * dev)909 static void vti6_dev_setup(struct net_device *dev)
910 {
911 dev->netdev_ops = &vti6_netdev_ops;
912 dev->header_ops = &ip_tunnel_header_ops;
913 dev->needs_free_netdev = true;
914
915 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
916 dev->type = ARPHRD_TUNNEL6;
917 dev->min_mtu = IPV4_MIN_MTU;
918 dev->max_mtu = IP_MAX_MTU - sizeof(struct ipv6hdr);
919 dev->flags |= IFF_NOARP;
920 dev->addr_len = sizeof(struct in6_addr);
921 netif_keep_dst(dev);
922 /* This perm addr will be used as interface identifier by IPv6 */
923 dev->addr_assign_type = NET_ADDR_RANDOM;
924 eth_random_addr(dev->perm_addr);
925 }
926
927 /**
928 * vti6_dev_init_gen - general initializer for all tunnel devices
929 * @dev: virtual device associated with tunnel
930 **/
vti6_dev_init_gen(struct net_device * dev)931 static inline int vti6_dev_init_gen(struct net_device *dev)
932 {
933 struct ip6_tnl *t = netdev_priv(dev);
934
935 t->dev = dev;
936 netdev_hold(dev, &t->dev_tracker, GFP_KERNEL);
937 netdev_lockdep_set_classes(dev);
938 return 0;
939 }
940
941 /**
942 * vti6_dev_init - initializer for all non fallback tunnel devices
943 * @dev: virtual device associated with tunnel
944 **/
vti6_dev_init(struct net_device * dev)945 static int vti6_dev_init(struct net_device *dev)
946 {
947 struct ip6_tnl *t = netdev_priv(dev);
948 int err = vti6_dev_init_gen(dev);
949
950 if (err)
951 return err;
952 vti6_link_config(t, true);
953 return 0;
954 }
955
956 /**
957 * vti6_fb_tnl_dev_init - initializer for fallback tunnel device
958 * @dev: fallback device
959 *
960 * Return: 0
961 **/
vti6_fb_tnl_dev_init(struct net_device * dev)962 static int __net_init vti6_fb_tnl_dev_init(struct net_device *dev)
963 {
964 struct ip6_tnl *t = netdev_priv(dev);
965 struct net *net = dev_net(dev);
966 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
967
968 t->net = net;
969 t->parms.proto = IPPROTO_IPV6;
970
971 rcu_assign_pointer(ip6n->tnls_wc[0], t);
972 return 0;
973 }
974
vti6_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)975 static int vti6_validate(struct nlattr *tb[], struct nlattr *data[],
976 struct netlink_ext_ack *extack)
977 {
978 return 0;
979 }
980
vti6_netlink_parms(struct nlattr * data[],struct __ip6_tnl_parm * parms)981 static void vti6_netlink_parms(struct nlattr *data[],
982 struct __ip6_tnl_parm *parms)
983 {
984 memset(parms, 0, sizeof(*parms));
985
986 if (!data)
987 return;
988
989 if (data[IFLA_VTI_LINK])
990 parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
991
992 if (data[IFLA_VTI_LOCAL])
993 parms->laddr = nla_get_in6_addr(data[IFLA_VTI_LOCAL]);
994
995 if (data[IFLA_VTI_REMOTE])
996 parms->raddr = nla_get_in6_addr(data[IFLA_VTI_REMOTE]);
997
998 if (data[IFLA_VTI_IKEY])
999 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
1000
1001 if (data[IFLA_VTI_OKEY])
1002 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
1003
1004 if (data[IFLA_VTI_FWMARK])
1005 parms->fwmark = nla_get_u32(data[IFLA_VTI_FWMARK]);
1006 }
1007
vti6_newlink(struct net_device * dev,struct rtnl_newlink_params * params,struct netlink_ext_ack * extack)1008 static int vti6_newlink(struct net_device *dev,
1009 struct rtnl_newlink_params *params,
1010 struct netlink_ext_ack *extack)
1011 {
1012 struct nlattr **data = params->data;
1013 struct ip6_tnl *nt;
1014 struct net *net;
1015
1016 net = params->link_net ? : dev_net(dev);
1017 nt = netdev_priv(dev);
1018 vti6_netlink_parms(data, &nt->parms);
1019
1020 nt->parms.proto = IPPROTO_IPV6;
1021 nt->net = net;
1022
1023 if (vti6_locate(net, &nt->parms, 0))
1024 return -EEXIST;
1025
1026 return vti6_tnl_create2(dev);
1027 }
1028
vti6_dellink(struct net_device * dev,struct list_head * head)1029 static void vti6_dellink(struct net_device *dev, struct list_head *head)
1030 {
1031 struct net *net = dev_net(dev);
1032 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1033
1034 if (dev != ip6n->fb_tnl_dev)
1035 unregister_netdevice_queue(dev, head);
1036 }
1037
vti6_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1038 static int vti6_changelink(struct net_device *dev, struct nlattr *tb[],
1039 struct nlattr *data[],
1040 struct netlink_ext_ack *extack)
1041 {
1042 struct ip6_tnl *t = netdev_priv(dev);
1043 struct net *net = t->net;
1044 struct __ip6_tnl_parm p;
1045 struct vti6_net *ip6n;
1046
1047 ip6n = net_generic(net, vti6_net_id);
1048 if (dev == ip6n->fb_tnl_dev)
1049 return -EINVAL;
1050
1051 vti6_netlink_parms(data, &p);
1052
1053 t = vti6_locate(net, &p, 0);
1054
1055 if (t) {
1056 if (t->dev != dev)
1057 return -EEXIST;
1058 } else
1059 t = netdev_priv(dev);
1060
1061 return vti6_update(t, &p, tb && tb[IFLA_MTU]);
1062 }
1063
vti6_get_size(const struct net_device * dev)1064 static size_t vti6_get_size(const struct net_device *dev)
1065 {
1066 return
1067 /* IFLA_VTI_LINK */
1068 nla_total_size(4) +
1069 /* IFLA_VTI_LOCAL */
1070 nla_total_size(sizeof(struct in6_addr)) +
1071 /* IFLA_VTI_REMOTE */
1072 nla_total_size(sizeof(struct in6_addr)) +
1073 /* IFLA_VTI_IKEY */
1074 nla_total_size(4) +
1075 /* IFLA_VTI_OKEY */
1076 nla_total_size(4) +
1077 /* IFLA_VTI_FWMARK */
1078 nla_total_size(4) +
1079 0;
1080 }
1081
vti6_fill_info(struct sk_buff * skb,const struct net_device * dev)1082 static int vti6_fill_info(struct sk_buff *skb, const struct net_device *dev)
1083 {
1084 struct ip6_tnl *tunnel = netdev_priv(dev);
1085 struct __ip6_tnl_parm *parm = &tunnel->parms;
1086
1087 if (nla_put_u32(skb, IFLA_VTI_LINK, parm->link) ||
1088 nla_put_in6_addr(skb, IFLA_VTI_LOCAL, &parm->laddr) ||
1089 nla_put_in6_addr(skb, IFLA_VTI_REMOTE, &parm->raddr) ||
1090 nla_put_be32(skb, IFLA_VTI_IKEY, parm->i_key) ||
1091 nla_put_be32(skb, IFLA_VTI_OKEY, parm->o_key) ||
1092 nla_put_u32(skb, IFLA_VTI_FWMARK, parm->fwmark))
1093 goto nla_put_failure;
1094 return 0;
1095
1096 nla_put_failure:
1097 return -EMSGSIZE;
1098 }
1099
1100 static const struct nla_policy vti6_policy[IFLA_VTI_MAX + 1] = {
1101 [IFLA_VTI_LINK] = { .type = NLA_U32 },
1102 [IFLA_VTI_LOCAL] = { .len = sizeof(struct in6_addr) },
1103 [IFLA_VTI_REMOTE] = { .len = sizeof(struct in6_addr) },
1104 [IFLA_VTI_IKEY] = { .type = NLA_U32 },
1105 [IFLA_VTI_OKEY] = { .type = NLA_U32 },
1106 [IFLA_VTI_FWMARK] = { .type = NLA_U32 },
1107 };
1108
1109 static struct rtnl_link_ops vti6_link_ops __read_mostly = {
1110 .kind = "vti6",
1111 .maxtype = IFLA_VTI_MAX,
1112 .policy = vti6_policy,
1113 .priv_size = sizeof(struct ip6_tnl),
1114 .setup = vti6_dev_setup,
1115 .validate = vti6_validate,
1116 .newlink = vti6_newlink,
1117 .dellink = vti6_dellink,
1118 .changelink = vti6_changelink,
1119 .get_size = vti6_get_size,
1120 .fill_info = vti6_fill_info,
1121 .get_link_net = ip6_tnl_get_link_net,
1122 };
1123
vti6_exit_rtnl_net(struct net * net,struct list_head * list)1124 static void __net_exit vti6_exit_rtnl_net(struct net *net, struct list_head *list)
1125 {
1126 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1127 struct ip6_tnl *t;
1128 int h;
1129
1130 for (h = 0; h < IP6_VTI_HASH_SIZE; h++) {
1131 t = rtnl_net_dereference(net, ip6n->tnls_r_l[h]);
1132 while (t) {
1133 unregister_netdevice_queue(t->dev, list);
1134 t = rtnl_net_dereference(net, t->next);
1135 }
1136 }
1137
1138 t = rtnl_net_dereference(net, ip6n->tnls_wc[0]);
1139 if (t)
1140 unregister_netdevice_queue(t->dev, list);
1141 }
1142
vti6_init_net(struct net * net)1143 static int __net_init vti6_init_net(struct net *net)
1144 {
1145 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1146 struct ip6_tnl *t = NULL;
1147 int err;
1148
1149 ip6n->tnls[0] = ip6n->tnls_wc;
1150 ip6n->tnls[1] = ip6n->tnls_r_l;
1151
1152 if (!net_has_fallback_tunnels(net))
1153 return 0;
1154 err = -ENOMEM;
1155 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6_vti0",
1156 NET_NAME_UNKNOWN, vti6_dev_setup);
1157
1158 if (!ip6n->fb_tnl_dev)
1159 goto err_alloc_dev;
1160 dev_net_set(ip6n->fb_tnl_dev, net);
1161 ip6n->fb_tnl_dev->rtnl_link_ops = &vti6_link_ops;
1162
1163 err = vti6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1164 if (err < 0)
1165 goto err_register;
1166
1167 err = register_netdev(ip6n->fb_tnl_dev);
1168 if (err < 0)
1169 goto err_register;
1170
1171 t = netdev_priv(ip6n->fb_tnl_dev);
1172
1173 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
1174 return 0;
1175
1176 err_register:
1177 free_netdev(ip6n->fb_tnl_dev);
1178 err_alloc_dev:
1179 return err;
1180 }
1181
1182 static struct pernet_operations vti6_net_ops = {
1183 .init = vti6_init_net,
1184 .exit_rtnl = vti6_exit_rtnl_net,
1185 .id = &vti6_net_id,
1186 .size = sizeof(struct vti6_net),
1187 };
1188
1189 static struct xfrm6_protocol vti_esp6_protocol __read_mostly = {
1190 .handler = vti6_rcv,
1191 .input_handler = vti6_input_proto,
1192 .cb_handler = vti6_rcv_cb,
1193 .err_handler = vti6_err,
1194 .priority = 100,
1195 };
1196
1197 static struct xfrm6_protocol vti_ah6_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_ipcomp6_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 #if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
vti6_rcv_tunnel(struct sk_buff * skb)1214 static int vti6_rcv_tunnel(struct sk_buff *skb)
1215 {
1216 const xfrm_address_t *saddr;
1217 __be32 spi;
1218
1219 saddr = (const xfrm_address_t *)&ipv6_hdr(skb)->saddr;
1220 spi = xfrm6_tunnel_spi_lookup(dev_net(skb->dev), saddr);
1221
1222 return vti6_input_proto(skb, IPPROTO_IPV6, spi, 0);
1223 }
1224
1225 static struct xfrm6_tunnel vti_ipv6_handler __read_mostly = {
1226 .handler = vti6_rcv_tunnel,
1227 .cb_handler = vti6_rcv_cb,
1228 .err_handler = vti6_err,
1229 .priority = 0,
1230 };
1231
1232 static struct xfrm6_tunnel vti_ip6ip_handler __read_mostly = {
1233 .handler = vti6_rcv_tunnel,
1234 .cb_handler = vti6_rcv_cb,
1235 .err_handler = vti6_err,
1236 .priority = 0,
1237 };
1238 #endif
1239
1240 /**
1241 * vti6_tunnel_init - register protocol and reserve needed resources
1242 *
1243 * Return: 0 on success
1244 **/
vti6_tunnel_init(void)1245 static int __init vti6_tunnel_init(void)
1246 {
1247 const char *msg;
1248 int err;
1249
1250 msg = "tunnel device";
1251 err = register_pernet_device(&vti6_net_ops);
1252 if (err < 0)
1253 goto pernet_dev_failed;
1254
1255 msg = "tunnel protocols";
1256 err = xfrm6_protocol_register(&vti_esp6_protocol, IPPROTO_ESP);
1257 if (err < 0)
1258 goto xfrm_proto_esp_failed;
1259 err = xfrm6_protocol_register(&vti_ah6_protocol, IPPROTO_AH);
1260 if (err < 0)
1261 goto xfrm_proto_ah_failed;
1262 err = xfrm6_protocol_register(&vti_ipcomp6_protocol, IPPROTO_COMP);
1263 if (err < 0)
1264 goto xfrm_proto_comp_failed;
1265 #if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
1266 msg = "ipv6 tunnel";
1267 err = xfrm6_tunnel_register(&vti_ipv6_handler, AF_INET6);
1268 if (err < 0)
1269 goto vti_tunnel_ipv6_failed;
1270 err = xfrm6_tunnel_register(&vti_ip6ip_handler, AF_INET);
1271 if (err < 0)
1272 goto vti_tunnel_ip6ip_failed;
1273 #endif
1274
1275 msg = "netlink interface";
1276 err = rtnl_link_register(&vti6_link_ops);
1277 if (err < 0)
1278 goto rtnl_link_failed;
1279
1280 return 0;
1281
1282 rtnl_link_failed:
1283 #if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
1284 err = xfrm6_tunnel_deregister(&vti_ip6ip_handler, AF_INET);
1285 vti_tunnel_ip6ip_failed:
1286 err = xfrm6_tunnel_deregister(&vti_ipv6_handler, AF_INET6);
1287 vti_tunnel_ipv6_failed:
1288 #endif
1289 xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1290 xfrm_proto_comp_failed:
1291 xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1292 xfrm_proto_ah_failed:
1293 xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1294 xfrm_proto_esp_failed:
1295 unregister_pernet_device(&vti6_net_ops);
1296 pernet_dev_failed:
1297 pr_err("vti6 init: failed to register %s\n", msg);
1298 return err;
1299 }
1300
1301 /**
1302 * vti6_tunnel_cleanup - free resources and unregister protocol
1303 **/
vti6_tunnel_cleanup(void)1304 static void __exit vti6_tunnel_cleanup(void)
1305 {
1306 rtnl_link_unregister(&vti6_link_ops);
1307 #if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
1308 xfrm6_tunnel_deregister(&vti_ip6ip_handler, AF_INET);
1309 xfrm6_tunnel_deregister(&vti_ipv6_handler, AF_INET6);
1310 #endif
1311 xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1312 xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1313 xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1314 unregister_pernet_device(&vti6_net_ops);
1315 }
1316
1317 module_init(vti6_tunnel_init);
1318 module_exit(vti6_tunnel_cleanup);
1319 MODULE_LICENSE("GPL");
1320 MODULE_ALIAS_RTNL_LINK("vti6");
1321 MODULE_ALIAS_NETDEV("ip6_vti0");
1322 MODULE_AUTHOR("Steffen Klassert");
1323 MODULE_DESCRIPTION("IPv6 virtual tunnel interface");
1324