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 * @ip6n: the private data for ip6_vti in the netns
129 * @p: parameters containing tunnel end-points
130 *
131 * Description:
132 * vti6_tnl_bucket() returns the head of the list matching the
133 * &struct in6_addr entries laddr and raddr in @p.
134 *
135 * Return: head of IPv6 tunnel list
136 **/
137 static struct ip6_tnl __rcu **
vti6_tnl_bucket(struct vti6_net * ip6n,const struct __ip6_tnl_parm * p)138 vti6_tnl_bucket(struct vti6_net *ip6n, const struct __ip6_tnl_parm *p)
139 {
140 const struct in6_addr *remote = &p->raddr;
141 const struct in6_addr *local = &p->laddr;
142 unsigned int h = 0;
143 int prio = 0;
144
145 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
146 prio = 1;
147 h = HASH(remote, local);
148 }
149 return &ip6n->tnls[prio][h];
150 }
151
152 static void
vti6_tnl_link(struct vti6_net * ip6n,struct ip6_tnl * t)153 vti6_tnl_link(struct vti6_net *ip6n, struct ip6_tnl *t)
154 {
155 struct ip6_tnl __rcu **tp = vti6_tnl_bucket(ip6n, &t->parms);
156
157 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
158 rcu_assign_pointer(*tp, t);
159 }
160
161 static void
vti6_tnl_unlink(struct vti6_net * ip6n,struct ip6_tnl * t)162 vti6_tnl_unlink(struct vti6_net *ip6n, struct ip6_tnl *t)
163 {
164 struct ip6_tnl __rcu **tp;
165 struct ip6_tnl *iter;
166
167 for (tp = vti6_tnl_bucket(ip6n, &t->parms);
168 (iter = rtnl_dereference(*tp)) != NULL;
169 tp = &iter->next) {
170 if (t == iter) {
171 rcu_assign_pointer(*tp, t->next);
172 break;
173 }
174 }
175 }
176
vti6_dev_free(struct net_device * dev)177 static void vti6_dev_free(struct net_device *dev)
178 {
179 free_percpu(dev->tstats);
180 }
181
vti6_tnl_create2(struct net_device * dev)182 static int vti6_tnl_create2(struct net_device *dev)
183 {
184 struct ip6_tnl *t = netdev_priv(dev);
185 struct net *net = dev_net(dev);
186 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
187 int err;
188
189 dev->rtnl_link_ops = &vti6_link_ops;
190 err = register_netdevice(dev);
191 if (err < 0)
192 goto out;
193
194 strcpy(t->parms.name, dev->name);
195
196 vti6_tnl_link(ip6n, t);
197
198 return 0;
199
200 out:
201 return err;
202 }
203
vti6_tnl_create(struct net * net,struct __ip6_tnl_parm * p)204 static struct ip6_tnl *vti6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
205 {
206 struct net_device *dev;
207 struct ip6_tnl *t;
208 char name[IFNAMSIZ];
209 int err;
210
211 if (p->name[0]) {
212 if (!dev_valid_name(p->name))
213 goto failed;
214 strscpy(name, p->name, IFNAMSIZ);
215 } else {
216 sprintf(name, "ip6_vti%%d");
217 }
218
219 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, vti6_dev_setup);
220 if (!dev)
221 goto failed;
222
223 dev_net_set(dev, net);
224
225 t = netdev_priv(dev);
226 t->parms = *p;
227 t->net = dev_net(dev);
228
229 err = vti6_tnl_create2(dev);
230 if (err < 0)
231 goto failed_free;
232
233 return t;
234
235 failed_free:
236 free_netdev(dev);
237 failed:
238 return NULL;
239 }
240
241 /**
242 * vti6_locate - find or create tunnel matching given parameters
243 * @net: network namespace
244 * @p: tunnel parameters
245 * @create: != 0 if allowed to create new tunnel if no match found
246 *
247 * Description:
248 * vti6_locate() first tries to locate an existing tunnel
249 * based on @parms. If this is unsuccessful, but @create is set a new
250 * tunnel device is created and registered for use.
251 *
252 * Return:
253 * matching tunnel or NULL
254 **/
vti6_locate(struct net * net,struct __ip6_tnl_parm * p,int create)255 static struct ip6_tnl *vti6_locate(struct net *net, struct __ip6_tnl_parm *p,
256 int create)
257 {
258 const struct in6_addr *remote = &p->raddr;
259 const struct in6_addr *local = &p->laddr;
260 struct ip6_tnl __rcu **tp;
261 struct ip6_tnl *t;
262 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
263
264 for (tp = vti6_tnl_bucket(ip6n, p);
265 (t = rtnl_dereference(*tp)) != NULL;
266 tp = &t->next) {
267 if (ipv6_addr_equal(local, &t->parms.laddr) &&
268 ipv6_addr_equal(remote, &t->parms.raddr)) {
269 if (create)
270 return NULL;
271
272 return t;
273 }
274 }
275 if (!create)
276 return NULL;
277 return vti6_tnl_create(net, p);
278 }
279
280 /**
281 * vti6_dev_uninit - tunnel device uninitializer
282 * @dev: the device to be destroyed
283 *
284 * Description:
285 * vti6_dev_uninit() removes tunnel from its list
286 **/
vti6_dev_uninit(struct net_device * dev)287 static void vti6_dev_uninit(struct net_device *dev)
288 {
289 struct ip6_tnl *t = netdev_priv(dev);
290 struct vti6_net *ip6n = net_generic(t->net, vti6_net_id);
291
292 if (dev == ip6n->fb_tnl_dev)
293 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
294 else
295 vti6_tnl_unlink(ip6n, t);
296 netdev_put(dev, &t->dev_tracker);
297 }
298
vti6_input_proto(struct sk_buff * skb,int nexthdr,__be32 spi,int encap_type)299 static int vti6_input_proto(struct sk_buff *skb, int nexthdr, __be32 spi,
300 int encap_type)
301 {
302 struct ip6_tnl *t;
303 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
304
305 rcu_read_lock();
306 t = vti6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr);
307 if (t) {
308 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 goto discard;
316 }
317
318 ipv6h = ipv6_hdr(skb);
319 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) {
320 DEV_STATS_INC(t->dev, rx_dropped);
321 rcu_read_unlock();
322 goto discard;
323 }
324
325 rcu_read_unlock();
326
327 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = t;
328 XFRM_SPI_SKB_CB(skb)->family = AF_INET6;
329 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr);
330 return xfrm_input(skb, nexthdr, spi, encap_type);
331 }
332 rcu_read_unlock();
333 return -EINVAL;
334 discard:
335 kfree_skb(skb);
336 return 0;
337 }
338
vti6_rcv(struct sk_buff * skb)339 static int vti6_rcv(struct sk_buff *skb)
340 {
341 int nexthdr = skb_network_header(skb)[IP6CB(skb)->nhoff];
342
343 return vti6_input_proto(skb, nexthdr, 0, 0);
344 }
345
vti6_rcv_cb(struct sk_buff * skb,int err)346 static int vti6_rcv_cb(struct sk_buff *skb, int err)
347 {
348 unsigned short family;
349 struct net_device *dev;
350 struct xfrm_state *x;
351 const struct xfrm_mode *inner_mode;
352 struct ip6_tnl *t = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6;
353 u32 orig_mark = skb->mark;
354 int ret;
355
356 if (!t)
357 return 1;
358
359 dev = t->dev;
360
361 if (err) {
362 DEV_STATS_INC(dev, rx_errors);
363 DEV_STATS_INC(dev, rx_dropped);
364
365 return 0;
366 }
367
368 x = xfrm_input_state(skb);
369
370 inner_mode = &x->inner_mode;
371
372 if (x->sel.family == AF_UNSPEC) {
373 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
374 if (inner_mode == NULL) {
375 XFRM_INC_STATS(dev_net(skb->dev),
376 LINUX_MIB_XFRMINSTATEMODEERROR);
377 return -EINVAL;
378 }
379 }
380
381 family = inner_mode->family;
382
383 skb->mark = be32_to_cpu(t->parms.i_key);
384 ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family);
385 skb->mark = orig_mark;
386
387 if (!ret)
388 return -EPERM;
389
390 skb_scrub_packet(skb, !net_eq(t->net, dev_net(skb->dev)));
391 skb->dev = dev;
392 dev_sw_netstats_rx_add(dev, skb->len);
393
394 return 0;
395 }
396
397 /**
398 * vti6_addr_conflict - compare packet addresses to tunnel's own
399 * @t: the outgoing tunnel device
400 * @hdr: IPv6 header from the incoming packet
401 *
402 * Description:
403 * Avoid trivial tunneling loop by checking that tunnel exit-point
404 * doesn't match source of incoming packet.
405 *
406 * Return:
407 * 1 if conflict,
408 * 0 else
409 **/
410 static inline bool
vti6_addr_conflict(const struct ip6_tnl * t,const struct ipv6hdr * hdr)411 vti6_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
412 {
413 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
414 }
415
vti6_state_check(const struct xfrm_state * x,const struct in6_addr * dst,const struct in6_addr * src)416 static bool vti6_state_check(const struct xfrm_state *x,
417 const struct in6_addr *dst,
418 const struct in6_addr *src)
419 {
420 xfrm_address_t *daddr = (xfrm_address_t *)dst;
421 xfrm_address_t *saddr = (xfrm_address_t *)src;
422
423 /* if there is no transform then this tunnel is not functional.
424 * Or if the xfrm is not mode tunnel.
425 */
426 if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
427 x->props.family != AF_INET6)
428 return false;
429
430 if (ipv6_addr_any(dst))
431 return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET6);
432
433 if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET6))
434 return false;
435
436 return true;
437 }
438
439 /**
440 * vti6_xmit - send a packet
441 * @skb: the outgoing socket buffer
442 * @dev: the outgoing tunnel device
443 * @fl: the flow informations for the xfrm_lookup
444 **/
445 static int
vti6_xmit(struct sk_buff * skb,struct net_device * dev,struct flowi * fl)446 vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
447 {
448 struct ip6_tnl *t = netdev_priv(dev);
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 xmit;
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 DEV_STATS_INC(dev, 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 if (!(ip_hdr(skb)->frag_off & htons(IP_DF)))
525 goto xmit;
526 icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
527 htonl(mtu));
528 }
529
530 err = -EMSGSIZE;
531 goto tx_err_dst_release;
532 }
533
534 xmit:
535 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
536 skb_dst_set(skb, dst);
537 skb->dev = skb_dst(skb)->dev;
538
539 err = dst_output(t->net, skb->sk, skb);
540 if (net_xmit_eval(err) == 0)
541 err = pkt_len;
542 iptunnel_xmit_stats(dev, err);
543
544 return 0;
545 tx_err_link_failure:
546 DEV_STATS_INC(dev, tx_carrier_errors);
547 dst_link_failure(skb);
548 tx_err_dst_release:
549 dst_release(dst);
550 return err;
551 }
552
553 static netdev_tx_t
vti6_tnl_xmit(struct sk_buff * skb,struct net_device * dev)554 vti6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
555 {
556 struct ip6_tnl *t = netdev_priv(dev);
557 struct flowi fl;
558 int ret;
559
560 if (!pskb_inet_may_pull(skb))
561 goto tx_err;
562
563 memset(&fl, 0, sizeof(fl));
564
565 switch (skb->protocol) {
566 case htons(ETH_P_IPV6):
567 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
568 vti6_addr_conflict(t, ipv6_hdr(skb)))
569 goto tx_err;
570
571 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
572 xfrm_decode_session(skb, &fl, AF_INET6);
573 break;
574 case htons(ETH_P_IP):
575 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
576 xfrm_decode_session(skb, &fl, AF_INET);
577 break;
578 default:
579 goto tx_err;
580 }
581
582 /* override mark with tunnel output key */
583 fl.flowi_mark = be32_to_cpu(t->parms.o_key);
584
585 ret = vti6_xmit(skb, dev, &fl);
586 if (ret < 0)
587 goto tx_err;
588
589 return NETDEV_TX_OK;
590
591 tx_err:
592 DEV_STATS_INC(dev, tx_errors);
593 DEV_STATS_INC(dev, tx_dropped);
594 kfree_skb(skb);
595 return NETDEV_TX_OK;
596 }
597
vti6_err(struct sk_buff * skb,struct inet6_skb_parm * opt,u8 type,u8 code,int offset,__be32 info)598 static int vti6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
599 u8 type, u8 code, int offset, __be32 info)
600 {
601 __be32 spi;
602 __u32 mark;
603 struct xfrm_state *x;
604 struct ip6_tnl *t;
605 struct ip_esp_hdr *esph;
606 struct ip_auth_hdr *ah;
607 struct ip_comp_hdr *ipch;
608 struct net *net = dev_net(skb->dev);
609 const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
610 int protocol = iph->nexthdr;
611
612 t = vti6_tnl_lookup(dev_net(skb->dev), &iph->daddr, &iph->saddr);
613 if (!t)
614 return -1;
615
616 mark = be32_to_cpu(t->parms.o_key);
617
618 switch (protocol) {
619 case IPPROTO_ESP:
620 esph = (struct ip_esp_hdr *)(skb->data + offset);
621 spi = esph->spi;
622 break;
623 case IPPROTO_AH:
624 ah = (struct ip_auth_hdr *)(skb->data + offset);
625 spi = ah->spi;
626 break;
627 case IPPROTO_COMP:
628 ipch = (struct ip_comp_hdr *)(skb->data + offset);
629 spi = htonl(ntohs(ipch->cpi));
630 break;
631 default:
632 return 0;
633 }
634
635 if (type != ICMPV6_PKT_TOOBIG &&
636 type != NDISC_REDIRECT)
637 return 0;
638
639 x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
640 spi, protocol, AF_INET6);
641 if (!x)
642 return 0;
643
644 if (type == NDISC_REDIRECT)
645 ip6_redirect(skb, net, skb->dev->ifindex, 0,
646 sock_net_uid(net, NULL));
647 else
648 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
649 xfrm_state_put(x);
650
651 return 0;
652 }
653
vti6_link_config(struct ip6_tnl * t,bool keep_mtu)654 static void vti6_link_config(struct ip6_tnl *t, bool keep_mtu)
655 {
656 struct net_device *dev = t->dev;
657 struct __ip6_tnl_parm *p = &t->parms;
658 struct net_device *tdev = NULL;
659 int mtu;
660
661 __dev_addr_set(dev, &p->laddr, sizeof(struct in6_addr));
662 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
663
664 p->flags &= ~(IP6_TNL_F_CAP_XMIT | IP6_TNL_F_CAP_RCV |
665 IP6_TNL_F_CAP_PER_PACKET);
666 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
667
668 if (p->flags & IP6_TNL_F_CAP_XMIT && p->flags & IP6_TNL_F_CAP_RCV)
669 dev->flags |= IFF_POINTOPOINT;
670 else
671 dev->flags &= ~IFF_POINTOPOINT;
672
673 if (keep_mtu && dev->mtu) {
674 dev->mtu = clamp(dev->mtu, dev->min_mtu, dev->max_mtu);
675 return;
676 }
677
678 if (p->flags & IP6_TNL_F_CAP_XMIT) {
679 int strict = (ipv6_addr_type(&p->raddr) &
680 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL));
681 struct rt6_info *rt = rt6_lookup(t->net,
682 &p->raddr, &p->laddr,
683 p->link, NULL, strict);
684
685 if (rt)
686 tdev = rt->dst.dev;
687 ip6_rt_put(rt);
688 }
689
690 if (!tdev && p->link)
691 tdev = __dev_get_by_index(t->net, p->link);
692
693 if (tdev)
694 mtu = tdev->mtu - sizeof(struct ipv6hdr);
695 else
696 mtu = ETH_DATA_LEN - LL_MAX_HEADER - sizeof(struct ipv6hdr);
697
698 dev->mtu = max_t(int, mtu, IPV4_MIN_MTU);
699 }
700
701 /**
702 * vti6_tnl_change - update the tunnel parameters
703 * @t: tunnel to be changed
704 * @p: tunnel configuration parameters
705 * @keep_mtu: MTU was set from userspace, don't re-compute it
706 *
707 * Description:
708 * vti6_tnl_change() updates the tunnel parameters
709 **/
710 static int
vti6_tnl_change(struct ip6_tnl * t,const struct __ip6_tnl_parm * p,bool keep_mtu)711 vti6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
712 bool keep_mtu)
713 {
714 t->parms.laddr = p->laddr;
715 t->parms.raddr = p->raddr;
716 t->parms.link = p->link;
717 t->parms.i_key = p->i_key;
718 t->parms.o_key = p->o_key;
719 t->parms.proto = p->proto;
720 t->parms.fwmark = p->fwmark;
721 dst_cache_reset(&t->dst_cache);
722 vti6_link_config(t, keep_mtu);
723 return 0;
724 }
725
vti6_update(struct ip6_tnl * t,struct __ip6_tnl_parm * p,bool keep_mtu)726 static int vti6_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p,
727 bool keep_mtu)
728 {
729 struct net *net = dev_net(t->dev);
730 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
731 int err;
732
733 vti6_tnl_unlink(ip6n, t);
734 synchronize_net();
735 err = vti6_tnl_change(t, p, keep_mtu);
736 vti6_tnl_link(ip6n, t);
737 netdev_state_change(t->dev);
738 return err;
739 }
740
741 static void
vti6_parm_from_user(struct __ip6_tnl_parm * p,const struct ip6_tnl_parm2 * u)742 vti6_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm2 *u)
743 {
744 p->laddr = u->laddr;
745 p->raddr = u->raddr;
746 p->link = u->link;
747 p->i_key = u->i_key;
748 p->o_key = u->o_key;
749 p->proto = u->proto;
750
751 memcpy(p->name, u->name, sizeof(u->name));
752 }
753
754 static void
vti6_parm_to_user(struct ip6_tnl_parm2 * u,const struct __ip6_tnl_parm * p)755 vti6_parm_to_user(struct ip6_tnl_parm2 *u, const struct __ip6_tnl_parm *p)
756 {
757 u->laddr = p->laddr;
758 u->raddr = p->raddr;
759 u->link = p->link;
760 u->i_key = p->i_key;
761 u->o_key = p->o_key;
762 if (u->i_key)
763 u->i_flags |= GRE_KEY;
764 if (u->o_key)
765 u->o_flags |= GRE_KEY;
766 u->proto = p->proto;
767
768 memcpy(u->name, p->name, sizeof(u->name));
769 }
770
771 /**
772 * vti6_siocdevprivate - configure vti6 tunnels from userspace
773 * @dev: virtual device associated with tunnel
774 * @ifr: unused
775 * @data: parameters passed from userspace
776 * @cmd: command to be performed
777 *
778 * Description:
779 * vti6_siocdevprivate() is used for managing vti6 tunnels
780 * from userspace.
781 *
782 * The possible commands are the following:
783 * %SIOCGETTUNNEL: get tunnel parameters for device
784 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
785 * %SIOCCHGTUNNEL: change tunnel parameters to those given
786 * %SIOCDELTUNNEL: delete tunnel
787 *
788 * The fallback device "ip6_vti0", created during module
789 * initialization, can be used for creating other tunnel devices.
790 *
791 * Return:
792 * 0 on success,
793 * %-EFAULT if unable to copy data to or from userspace,
794 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
795 * %-EINVAL if passed tunnel parameters are invalid,
796 * %-EEXIST if changing a tunnel's parameters would cause a conflict
797 * %-ENODEV if attempting to change or delete a nonexisting device
798 **/
799 static int
vti6_siocdevprivate(struct net_device * dev,struct ifreq * ifr,void __user * data,int cmd)800 vti6_siocdevprivate(struct net_device *dev, struct ifreq *ifr, void __user *data, int cmd)
801 {
802 int err = 0;
803 struct ip6_tnl_parm2 p;
804 struct __ip6_tnl_parm p1;
805 struct ip6_tnl *t = NULL;
806 struct net *net = dev_net(dev);
807 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
808
809 memset(&p1, 0, sizeof(p1));
810
811 switch (cmd) {
812 case SIOCGETTUNNEL:
813 if (dev == ip6n->fb_tnl_dev) {
814 if (copy_from_user(&p, data, sizeof(p))) {
815 err = -EFAULT;
816 break;
817 }
818 vti6_parm_from_user(&p1, &p);
819 t = vti6_locate(net, &p1, 0);
820 } else {
821 memset(&p, 0, sizeof(p));
822 }
823 if (!t)
824 t = netdev_priv(dev);
825 vti6_parm_to_user(&p, &t->parms);
826 if (copy_to_user(data, &p, sizeof(p)))
827 err = -EFAULT;
828 break;
829 case SIOCADDTUNNEL:
830 case SIOCCHGTUNNEL:
831 err = -EPERM;
832 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
833 break;
834 err = -EFAULT;
835 if (copy_from_user(&p, data, sizeof(p)))
836 break;
837 err = -EINVAL;
838 if (p.proto != IPPROTO_IPV6 && p.proto != 0)
839 break;
840 vti6_parm_from_user(&p1, &p);
841 t = vti6_locate(net, &p1, cmd == SIOCADDTUNNEL);
842 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
843 if (t) {
844 if (t->dev != dev) {
845 err = -EEXIST;
846 break;
847 }
848 } else
849 t = netdev_priv(dev);
850
851 err = vti6_update(t, &p1, false);
852 }
853 if (t) {
854 err = 0;
855 vti6_parm_to_user(&p, &t->parms);
856 if (copy_to_user(data, &p, sizeof(p)))
857 err = -EFAULT;
858
859 } else
860 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
861 break;
862 case SIOCDELTUNNEL:
863 err = -EPERM;
864 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
865 break;
866
867 if (dev == ip6n->fb_tnl_dev) {
868 err = -EFAULT;
869 if (copy_from_user(&p, data, sizeof(p)))
870 break;
871 err = -ENOENT;
872 vti6_parm_from_user(&p1, &p);
873 t = vti6_locate(net, &p1, 0);
874 if (!t)
875 break;
876 err = -EPERM;
877 if (t->dev == ip6n->fb_tnl_dev)
878 break;
879 dev = t->dev;
880 }
881 err = 0;
882 unregister_netdevice(dev);
883 break;
884 default:
885 err = -EINVAL;
886 }
887 return err;
888 }
889
890 static const struct net_device_ops vti6_netdev_ops = {
891 .ndo_init = vti6_dev_init,
892 .ndo_uninit = vti6_dev_uninit,
893 .ndo_start_xmit = vti6_tnl_xmit,
894 .ndo_siocdevprivate = vti6_siocdevprivate,
895 .ndo_get_stats64 = dev_get_tstats64,
896 .ndo_get_iflink = ip6_tnl_get_iflink,
897 };
898
899 /**
900 * vti6_dev_setup - setup virtual tunnel device
901 * @dev: virtual device associated with tunnel
902 *
903 * Description:
904 * Initialize function pointers and device parameters
905 **/
vti6_dev_setup(struct net_device * dev)906 static void vti6_dev_setup(struct net_device *dev)
907 {
908 dev->netdev_ops = &vti6_netdev_ops;
909 dev->header_ops = &ip_tunnel_header_ops;
910 dev->needs_free_netdev = true;
911 dev->priv_destructor = vti6_dev_free;
912
913 dev->type = ARPHRD_TUNNEL6;
914 dev->min_mtu = IPV4_MIN_MTU;
915 dev->max_mtu = IP_MAX_MTU - sizeof(struct ipv6hdr);
916 dev->flags |= IFF_NOARP;
917 dev->addr_len = sizeof(struct in6_addr);
918 netif_keep_dst(dev);
919 /* This perm addr will be used as interface identifier by IPv6 */
920 dev->addr_assign_type = NET_ADDR_RANDOM;
921 eth_random_addr(dev->perm_addr);
922 }
923
924 /**
925 * vti6_dev_init_gen - general initializer for all tunnel devices
926 * @dev: virtual device associated with tunnel
927 **/
vti6_dev_init_gen(struct net_device * dev)928 static inline int vti6_dev_init_gen(struct net_device *dev)
929 {
930 struct ip6_tnl *t = netdev_priv(dev);
931
932 t->dev = dev;
933 t->net = dev_net(dev);
934 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
935 if (!dev->tstats)
936 return -ENOMEM;
937 netdev_hold(dev, &t->dev_tracker, GFP_KERNEL);
938 netdev_lockdep_set_classes(dev);
939 return 0;
940 }
941
942 /**
943 * vti6_dev_init - initializer for all non fallback tunnel devices
944 * @dev: virtual device associated with tunnel
945 **/
vti6_dev_init(struct net_device * dev)946 static int vti6_dev_init(struct net_device *dev)
947 {
948 struct ip6_tnl *t = netdev_priv(dev);
949 int err = vti6_dev_init_gen(dev);
950
951 if (err)
952 return err;
953 vti6_link_config(t, true);
954 return 0;
955 }
956
957 /**
958 * vti6_fb_tnl_dev_init - initializer for fallback tunnel device
959 * @dev: fallback device
960 *
961 * Return: 0
962 **/
vti6_fb_tnl_dev_init(struct net_device * dev)963 static int __net_init vti6_fb_tnl_dev_init(struct net_device *dev)
964 {
965 struct ip6_tnl *t = netdev_priv(dev);
966 struct net *net = dev_net(dev);
967 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
968
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 * src_net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1008 static int vti6_newlink(struct net *src_net, struct net_device *dev,
1009 struct nlattr *tb[], struct nlattr *data[],
1010 struct netlink_ext_ack *extack)
1011 {
1012 struct net *net = dev_net(dev);
1013 struct ip6_tnl *nt;
1014
1015 nt = netdev_priv(dev);
1016 vti6_netlink_parms(data, &nt->parms);
1017
1018 nt->parms.proto = IPPROTO_IPV6;
1019
1020 if (vti6_locate(net, &nt->parms, 0))
1021 return -EEXIST;
1022
1023 return vti6_tnl_create2(dev);
1024 }
1025
vti6_dellink(struct net_device * dev,struct list_head * head)1026 static void vti6_dellink(struct net_device *dev, struct list_head *head)
1027 {
1028 struct net *net = dev_net(dev);
1029 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1030
1031 if (dev != ip6n->fb_tnl_dev)
1032 unregister_netdevice_queue(dev, head);
1033 }
1034
vti6_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1035 static int vti6_changelink(struct net_device *dev, struct nlattr *tb[],
1036 struct nlattr *data[],
1037 struct netlink_ext_ack *extack)
1038 {
1039 struct ip6_tnl *t;
1040 struct __ip6_tnl_parm p;
1041 struct net *net = dev_net(dev);
1042 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1043
1044 if (dev == ip6n->fb_tnl_dev)
1045 return -EINVAL;
1046
1047 vti6_netlink_parms(data, &p);
1048
1049 t = vti6_locate(net, &p, 0);
1050
1051 if (t) {
1052 if (t->dev != dev)
1053 return -EEXIST;
1054 } else
1055 t = netdev_priv(dev);
1056
1057 return vti6_update(t, &p, tb && tb[IFLA_MTU]);
1058 }
1059
vti6_get_size(const struct net_device * dev)1060 static size_t vti6_get_size(const struct net_device *dev)
1061 {
1062 return
1063 /* IFLA_VTI_LINK */
1064 nla_total_size(4) +
1065 /* IFLA_VTI_LOCAL */
1066 nla_total_size(sizeof(struct in6_addr)) +
1067 /* IFLA_VTI_REMOTE */
1068 nla_total_size(sizeof(struct in6_addr)) +
1069 /* IFLA_VTI_IKEY */
1070 nla_total_size(4) +
1071 /* IFLA_VTI_OKEY */
1072 nla_total_size(4) +
1073 /* IFLA_VTI_FWMARK */
1074 nla_total_size(4) +
1075 0;
1076 }
1077
vti6_fill_info(struct sk_buff * skb,const struct net_device * dev)1078 static int vti6_fill_info(struct sk_buff *skb, const struct net_device *dev)
1079 {
1080 struct ip6_tnl *tunnel = netdev_priv(dev);
1081 struct __ip6_tnl_parm *parm = &tunnel->parms;
1082
1083 if (nla_put_u32(skb, IFLA_VTI_LINK, parm->link) ||
1084 nla_put_in6_addr(skb, IFLA_VTI_LOCAL, &parm->laddr) ||
1085 nla_put_in6_addr(skb, IFLA_VTI_REMOTE, &parm->raddr) ||
1086 nla_put_be32(skb, IFLA_VTI_IKEY, parm->i_key) ||
1087 nla_put_be32(skb, IFLA_VTI_OKEY, parm->o_key) ||
1088 nla_put_u32(skb, IFLA_VTI_FWMARK, parm->fwmark))
1089 goto nla_put_failure;
1090 return 0;
1091
1092 nla_put_failure:
1093 return -EMSGSIZE;
1094 }
1095
1096 static const struct nla_policy vti6_policy[IFLA_VTI_MAX + 1] = {
1097 [IFLA_VTI_LINK] = { .type = NLA_U32 },
1098 [IFLA_VTI_LOCAL] = { .len = sizeof(struct in6_addr) },
1099 [IFLA_VTI_REMOTE] = { .len = sizeof(struct in6_addr) },
1100 [IFLA_VTI_IKEY] = { .type = NLA_U32 },
1101 [IFLA_VTI_OKEY] = { .type = NLA_U32 },
1102 [IFLA_VTI_FWMARK] = { .type = NLA_U32 },
1103 };
1104
1105 static struct rtnl_link_ops vti6_link_ops __read_mostly = {
1106 .kind = "vti6",
1107 .maxtype = IFLA_VTI_MAX,
1108 .policy = vti6_policy,
1109 .priv_size = sizeof(struct ip6_tnl),
1110 .setup = vti6_dev_setup,
1111 .validate = vti6_validate,
1112 .newlink = vti6_newlink,
1113 .dellink = vti6_dellink,
1114 .changelink = vti6_changelink,
1115 .get_size = vti6_get_size,
1116 .fill_info = vti6_fill_info,
1117 .get_link_net = ip6_tnl_get_link_net,
1118 };
1119
vti6_destroy_tunnels(struct vti6_net * ip6n,struct list_head * list)1120 static void __net_exit vti6_destroy_tunnels(struct vti6_net *ip6n,
1121 struct list_head *list)
1122 {
1123 int h;
1124 struct ip6_tnl *t;
1125
1126 for (h = 0; h < IP6_VTI_HASH_SIZE; h++) {
1127 t = rtnl_dereference(ip6n->tnls_r_l[h]);
1128 while (t) {
1129 unregister_netdevice_queue(t->dev, list);
1130 t = rtnl_dereference(t->next);
1131 }
1132 }
1133
1134 t = rtnl_dereference(ip6n->tnls_wc[0]);
1135 if (t)
1136 unregister_netdevice_queue(t->dev, list);
1137 }
1138
vti6_init_net(struct net * net)1139 static int __net_init vti6_init_net(struct net *net)
1140 {
1141 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1142 struct ip6_tnl *t = NULL;
1143 int err;
1144
1145 ip6n->tnls[0] = ip6n->tnls_wc;
1146 ip6n->tnls[1] = ip6n->tnls_r_l;
1147
1148 if (!net_has_fallback_tunnels(net))
1149 return 0;
1150 err = -ENOMEM;
1151 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6_vti0",
1152 NET_NAME_UNKNOWN, vti6_dev_setup);
1153
1154 if (!ip6n->fb_tnl_dev)
1155 goto err_alloc_dev;
1156 dev_net_set(ip6n->fb_tnl_dev, net);
1157 ip6n->fb_tnl_dev->rtnl_link_ops = &vti6_link_ops;
1158
1159 err = vti6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1160 if (err < 0)
1161 goto err_register;
1162
1163 err = register_netdev(ip6n->fb_tnl_dev);
1164 if (err < 0)
1165 goto err_register;
1166
1167 t = netdev_priv(ip6n->fb_tnl_dev);
1168
1169 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
1170 return 0;
1171
1172 err_register:
1173 free_netdev(ip6n->fb_tnl_dev);
1174 err_alloc_dev:
1175 return err;
1176 }
1177
vti6_exit_batch_net(struct list_head * net_list)1178 static void __net_exit vti6_exit_batch_net(struct list_head *net_list)
1179 {
1180 struct vti6_net *ip6n;
1181 struct net *net;
1182 LIST_HEAD(list);
1183
1184 rtnl_lock();
1185 list_for_each_entry(net, net_list, exit_list) {
1186 ip6n = net_generic(net, vti6_net_id);
1187 vti6_destroy_tunnels(ip6n, &list);
1188 }
1189 unregister_netdevice_many(&list);
1190 rtnl_unlock();
1191 }
1192
1193 static struct pernet_operations vti6_net_ops = {
1194 .init = vti6_init_net,
1195 .exit_batch = vti6_exit_batch_net,
1196 .id = &vti6_net_id,
1197 .size = sizeof(struct vti6_net),
1198 };
1199
1200 static struct xfrm6_protocol vti_esp6_protocol __read_mostly = {
1201 .handler = vti6_rcv,
1202 .input_handler = vti6_input_proto,
1203 .cb_handler = vti6_rcv_cb,
1204 .err_handler = vti6_err,
1205 .priority = 100,
1206 };
1207
1208 static struct xfrm6_protocol vti_ah6_protocol __read_mostly = {
1209 .handler = vti6_rcv,
1210 .input_handler = vti6_input_proto,
1211 .cb_handler = vti6_rcv_cb,
1212 .err_handler = vti6_err,
1213 .priority = 100,
1214 };
1215
1216 static struct xfrm6_protocol vti_ipcomp6_protocol __read_mostly = {
1217 .handler = vti6_rcv,
1218 .input_handler = vti6_input_proto,
1219 .cb_handler = vti6_rcv_cb,
1220 .err_handler = vti6_err,
1221 .priority = 100,
1222 };
1223
1224 #if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
vti6_rcv_tunnel(struct sk_buff * skb)1225 static int vti6_rcv_tunnel(struct sk_buff *skb)
1226 {
1227 const xfrm_address_t *saddr;
1228 __be32 spi;
1229
1230 saddr = (const xfrm_address_t *)&ipv6_hdr(skb)->saddr;
1231 spi = xfrm6_tunnel_spi_lookup(dev_net(skb->dev), saddr);
1232
1233 return vti6_input_proto(skb, IPPROTO_IPV6, spi, 0);
1234 }
1235
1236 static struct xfrm6_tunnel vti_ipv6_handler __read_mostly = {
1237 .handler = vti6_rcv_tunnel,
1238 .cb_handler = vti6_rcv_cb,
1239 .err_handler = vti6_err,
1240 .priority = 0,
1241 };
1242
1243 static struct xfrm6_tunnel vti_ip6ip_handler __read_mostly = {
1244 .handler = vti6_rcv_tunnel,
1245 .cb_handler = vti6_rcv_cb,
1246 .err_handler = vti6_err,
1247 .priority = 0,
1248 };
1249 #endif
1250
1251 /**
1252 * vti6_tunnel_init - register protocol and reserve needed resources
1253 *
1254 * Return: 0 on success
1255 **/
vti6_tunnel_init(void)1256 static int __init vti6_tunnel_init(void)
1257 {
1258 const char *msg;
1259 int err;
1260
1261 msg = "tunnel device";
1262 err = register_pernet_device(&vti6_net_ops);
1263 if (err < 0)
1264 goto pernet_dev_failed;
1265
1266 msg = "tunnel protocols";
1267 err = xfrm6_protocol_register(&vti_esp6_protocol, IPPROTO_ESP);
1268 if (err < 0)
1269 goto xfrm_proto_esp_failed;
1270 err = xfrm6_protocol_register(&vti_ah6_protocol, IPPROTO_AH);
1271 if (err < 0)
1272 goto xfrm_proto_ah_failed;
1273 err = xfrm6_protocol_register(&vti_ipcomp6_protocol, IPPROTO_COMP);
1274 if (err < 0)
1275 goto xfrm_proto_comp_failed;
1276 #if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
1277 msg = "ipv6 tunnel";
1278 err = xfrm6_tunnel_register(&vti_ipv6_handler, AF_INET6);
1279 if (err < 0)
1280 goto vti_tunnel_ipv6_failed;
1281 err = xfrm6_tunnel_register(&vti_ip6ip_handler, AF_INET);
1282 if (err < 0)
1283 goto vti_tunnel_ip6ip_failed;
1284 #endif
1285
1286 msg = "netlink interface";
1287 err = rtnl_link_register(&vti6_link_ops);
1288 if (err < 0)
1289 goto rtnl_link_failed;
1290
1291 return 0;
1292
1293 rtnl_link_failed:
1294 #if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
1295 err = xfrm6_tunnel_deregister(&vti_ip6ip_handler, AF_INET);
1296 vti_tunnel_ip6ip_failed:
1297 err = xfrm6_tunnel_deregister(&vti_ipv6_handler, AF_INET6);
1298 vti_tunnel_ipv6_failed:
1299 #endif
1300 xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1301 xfrm_proto_comp_failed:
1302 xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1303 xfrm_proto_ah_failed:
1304 xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1305 xfrm_proto_esp_failed:
1306 unregister_pernet_device(&vti6_net_ops);
1307 pernet_dev_failed:
1308 pr_err("vti6 init: failed to register %s\n", msg);
1309 return err;
1310 }
1311
1312 /**
1313 * vti6_tunnel_cleanup - free resources and unregister protocol
1314 **/
vti6_tunnel_cleanup(void)1315 static void __exit vti6_tunnel_cleanup(void)
1316 {
1317 rtnl_link_unregister(&vti6_link_ops);
1318 #if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
1319 xfrm6_tunnel_deregister(&vti_ip6ip_handler, AF_INET);
1320 xfrm6_tunnel_deregister(&vti_ipv6_handler, AF_INET6);
1321 #endif
1322 xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1323 xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1324 xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1325 unregister_pernet_device(&vti6_net_ops);
1326 }
1327
1328 module_init(vti6_tunnel_init);
1329 module_exit(vti6_tunnel_cleanup);
1330 MODULE_LICENSE("GPL");
1331 MODULE_ALIAS_RTNL_LINK("vti6");
1332 MODULE_ALIAS_NETDEV("ip6_vti0");
1333 MODULE_AUTHOR("Steffen Klassert");
1334 MODULE_DESCRIPTION("IPv6 virtual tunnel interface");
1335