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Merge branch 'for-4.20/apple' into for-linus
[linux-2.6-block.git] / net / ipv6 / ip6_vti.c
CommitLineData
ed1efb2a
SK		 1/*
2 * IPv6 virtual tunneling interface
3 *
4 * Copyright (C) 2013 secunet Security Networks AG
5 *
6 * Author:
7 * Steffen Klassert <steffen.klassert@secunet.com>
8 *
9 * Based on:
10 * net/ipv6/ip6_tunnel.c
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
16 */
17
18#include <linux/module.h>
19#include <linux/capability.h>
20#include <linux/errno.h>
21#include <linux/types.h>
22#include <linux/sockios.h>
23#include <linux/icmp.h>
24#include <linux/if.h>
25#include <linux/in.h>
26#include <linux/ip.h>
ed1efb2a
SK		 27#include <linux/net.h>
28#include <linux/in6.h>
29#include <linux/netdevice.h>
30#include <linux/if_arp.h>
31#include <linux/icmpv6.h>
32#include <linux/init.h>
33#include <linux/route.h>
34#include <linux/rtnetlink.h>
35#include <linux/netfilter_ipv6.h>
36#include <linux/slab.h>
37#include <linux/hash.h>
38
39#include <linux/uaccess.h>
40#include <linux/atomic.h>
41
42#include <net/icmp.h>
43#include <net/ip.h>
44#include <net/ip_tunnels.h>
45#include <net/ipv6.h>
46#include <net/ip6_route.h>
47#include <net/addrconf.h>
48#include <net/ip6_tunnel.h>
49#include <net/xfrm.h>
50#include <net/net_namespace.h>
51#include <net/netns/generic.h>
45ce0fd1 52#include <linux/etherdevice.h>
ed1efb2a 53
e87a8f24
JK		 54#define IP6_VTI_HASH_SIZE_SHIFT 5
55#define IP6_VTI_HASH_SIZE (1 << IP6_VTI_HASH_SIZE_SHIFT)
ed1efb2a
SK		 56
57static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
58{
59 u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
60
e87a8f24 61 return hash_32(hash, IP6_VTI_HASH_SIZE_SHIFT);
ed1efb2a
SK		 62}
63
64static int vti6_dev_init(struct net_device *dev);
65static void vti6_dev_setup(struct net_device *dev);
66static struct rtnl_link_ops vti6_link_ops __read_mostly;
67
c7d03a00 68static unsigned int vti6_net_id __read_mostly;
ed1efb2a
SK		 69struct vti6_net {
70 /* the vti6 tunnel fallback device */
71 struct net_device *fb_tnl_dev;
72 /* lists for storing tunnels in use */
e87a8f24 73 struct ip6_tnl __rcu *tnls_r_l[IP6_VTI_HASH_SIZE];
ed1efb2a
SK		 74 struct ip6_tnl __rcu *tnls_wc[1];
75 struct ip6_tnl __rcu **tnls[2];
76};
77
ed1efb2a
SK		 78#define for_each_vti6_tunnel_rcu(start) \
79 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
80
81/**
82 * vti6_tnl_lookup - fetch tunnel matching the end-point addresses
83 * @net: network namespace
84 * @remote: the address of the tunnel exit-point
85 * @local: the address of the tunnel entry-point
86 *
87 * Return:
88 * tunnel matching given end-points if found,
89 * else fallback tunnel if its device is up,
90 * else %NULL
91 **/
92static struct ip6_tnl *
93vti6_tnl_lookup(struct net *net, const struct in6_addr *remote,
94 const struct in6_addr *local)
95{
96 unsigned int hash = HASH(remote, local);
97 struct ip6_tnl *t;
98 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
fbe68ee8 99 struct in6_addr any;
ed1efb2a
SK		 100
101 for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
102 if (ipv6_addr_equal(local, &t->parms.laddr) &&
103 ipv6_addr_equal(remote, &t->parms.raddr) &&
104 (t->dev->flags & IFF_UP))
105 return t;
106 }
fbe68ee8
SK		 107
108 memset(&any, 0, sizeof(any));
109 hash = HASH(&any, local);
110 for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
111 if (ipv6_addr_equal(local, &t->parms.laddr) &&
112 (t->dev->flags & IFF_UP))
113 return t;
114 }
115
116 hash = HASH(remote, &any);
117 for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
118 if (ipv6_addr_equal(remote, &t->parms.raddr) &&
119 (t->dev->flags & IFF_UP))
120 return t;
121 }
122
ed1efb2a
SK		 123 t = rcu_dereference(ip6n->tnls_wc[0]);
124 if (t && (t->dev->flags & IFF_UP))
125 return t;
126
127 return NULL;
128}
129
130/**
131 * vti6_tnl_bucket - get head of list matching given tunnel parameters
132 * @p: parameters containing tunnel end-points
133 *
134 * Description:
135 * vti6_tnl_bucket() returns the head of the list matching the
136 * &struct in6_addr entries laddr and raddr in @p.
137 *
138 * Return: head of IPv6 tunnel list
139 **/
140static struct ip6_tnl __rcu **
141vti6_tnl_bucket(struct vti6_net *ip6n, const struct __ip6_tnl_parm *p)
142{
143 const struct in6_addr *remote = &p->raddr;
144 const struct in6_addr *local = &p->laddr;
145 unsigned int h = 0;
146 int prio = 0;
147
148 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
149 prio = 1;
150 h = HASH(remote, local);
151 }
152 return &ip6n->tnls[prio][h];
153}
154
155static void
156vti6_tnl_link(struct vti6_net *ip6n, struct ip6_tnl *t)
157{
158 struct ip6_tnl __rcu **tp = vti6_tnl_bucket(ip6n, &t->parms);
159
160 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
161 rcu_assign_pointer(*tp, t);
162}
163
164static void
165vti6_tnl_unlink(struct vti6_net *ip6n, struct ip6_tnl *t)
166{
167 struct ip6_tnl __rcu **tp;
168 struct ip6_tnl *iter;
169
170 for (tp = vti6_tnl_bucket(ip6n, &t->parms);
171 (iter = rtnl_dereference(*tp)) != NULL;
172 tp = &iter->next) {
173 if (t == iter) {
174 rcu_assign_pointer(*tp, t->next);
175 break;
176 }
177 }
178}
179
180static void vti6_dev_free(struct net_device *dev)
181{
182 free_percpu(dev->tstats);
ed1efb2a
SK		 183}
184
185static int vti6_tnl_create2(struct net_device *dev)
186{
187 struct ip6_tnl *t = netdev_priv(dev);
188 struct net *net = dev_net(dev);
189 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
190 int err;
191
93e246f7 192 dev->rtnl_link_ops = &vti6_link_ops;
ed1efb2a
SK		 193 err = register_netdevice(dev);
194 if (err < 0)
195 goto out;
196
197 strcpy(t->parms.name, dev->name);
ed1efb2a
SK		 198
199 dev_hold(dev);
200 vti6_tnl_link(ip6n, t);
201
202 return 0;
203
204out:
205 return err;
206}
207
208static struct ip6_tnl *vti6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
209{
210 struct net_device *dev;
211 struct ip6_tnl *t;
212 char name[IFNAMSIZ];
213 int err;
214
537b361f
ED		 215 if (p->name[0]) {
216 if (!dev_valid_name(p->name))
217 goto failed;
ed1efb2a 218 strlcpy(name, p->name, IFNAMSIZ);
537b361f 219 } else {
ed1efb2a 220 sprintf(name, "ip6_vti%%d");
537b361f 221 }
ed1efb2a 222
c835a677 223 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, vti6_dev_setup);
63159f29 224 if (!dev)
ed1efb2a
SK		 225 goto failed;
226
227 dev_net_set(dev, net);
228
229 t = netdev_priv(dev);
230 t->parms = *p;
231 t->net = dev_net(dev);
232
233 err = vti6_tnl_create2(dev);
234 if (err < 0)
235 goto failed_free;
236
237 return t;
238
239failed_free:
cf124db5 240 free_netdev(dev);
ed1efb2a
SK		 241failed:
242 return NULL;
243}
244
245/**
246 * vti6_locate - find or create tunnel matching given parameters
247 * @net: network namespace
248 * @p: tunnel parameters
249 * @create: != 0 if allowed to create new tunnel if no match found
250 *
251 * Description:
252 * vti6_locate() first tries to locate an existing tunnel
253 * based on @parms. If this is unsuccessful, but @create is set a new
254 * tunnel device is created and registered for use.
255 *
256 * Return:
257 * matching tunnel or NULL
258 **/
259static struct ip6_tnl *vti6_locate(struct net *net, struct __ip6_tnl_parm *p,
260 int create)
261{
262 const struct in6_addr *remote = &p->raddr;
263 const struct in6_addr *local = &p->laddr;
264 struct ip6_tnl __rcu **tp;
265 struct ip6_tnl *t;
266 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
267
268 for (tp = vti6_tnl_bucket(ip6n, p);
269 (t = rtnl_dereference(*tp)) != NULL;
270 tp = &t->next) {
271 if (ipv6_addr_equal(local, &t->parms.laddr) &&
d814b847
SK		 272 ipv6_addr_equal(remote, &t->parms.raddr)) {
273 if (create)
274 return NULL;
275
ed1efb2a 276 return t;
d814b847 277 }
ed1efb2a
SK		 278 }
279 if (!create)
280 return NULL;
281 return vti6_tnl_create(net, p);
282}
283
284/**
285 * vti6_dev_uninit - tunnel device uninitializer
286 * @dev: the device to be destroyed
287 *
288 * Description:
289 * vti6_dev_uninit() removes tunnel from its list
290 **/
291static void vti6_dev_uninit(struct net_device *dev)
292{
293 struct ip6_tnl *t = netdev_priv(dev);
092a29a4 294 struct vti6_net *ip6n = net_generic(t->net, vti6_net_id);
ed1efb2a
SK		 295
296 if (dev == ip6n->fb_tnl_dev)
297 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
298 else
299 vti6_tnl_unlink(ip6n, t);
ed1efb2a
SK		 300 dev_put(dev);
301}
302
303static int vti6_rcv(struct sk_buff *skb)
304{
305 struct ip6_tnl *t;
306 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
307
308 rcu_read_lock();
e5d08d71 309 t = vti6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr);
53b24b8f 310 if (t) {
ed1efb2a
SK		 311 if (t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) {
312 rcu_read_unlock();
313 goto discard;
314 }
315
316 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
317 rcu_read_unlock();
318 return 0;
319 }
320
321 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) {
322 t->dev->stats.rx_dropped++;
323 rcu_read_unlock();
324 goto discard;
325 }
326
ed1efb2a 327 rcu_read_unlock();
fa9ad96d 328
63c43787 329 return xfrm6_rcv_tnl(skb, t);
ed1efb2a
SK		 330 }
331 rcu_read_unlock();
fa9ad96d 332 return -EINVAL;
ed1efb2a
SK		 333discard:
334 kfree_skb(skb);
335 return 0;
336}
337
fa9ad96d
SK		 338static int vti6_rcv_cb(struct sk_buff *skb, int err)
339{
340 unsigned short family;
341 struct net_device *dev;
342 struct pcpu_sw_netstats *tstats;
343 struct xfrm_state *x;
1fb81e09 344 struct xfrm_mode *inner_mode;
fa9ad96d 345 struct ip6_tnl *t = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6;
d55c670c
AD		 346 u32 orig_mark = skb->mark;
347 int ret;
fa9ad96d
SK		 348
349 if (!t)
350 return 1;
351
352 dev = t->dev;
353
354 if (err) {
355 dev->stats.rx_errors++;
356 dev->stats.rx_dropped++;
357
358 return 0;
359 }
360
361 x = xfrm_input_state(skb);
1fb81e09 362
363 inner_mode = x->inner_mode;
364
365 if (x->sel.family == AF_UNSPEC) {
366 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
367 if (inner_mode == NULL) {
368 XFRM_INC_STATS(dev_net(skb->dev),
369 LINUX_MIB_XFRMINSTATEMODEERROR);
370 return -EINVAL;
371 }
372 }
373
374 family = inner_mode->afinfo->family;
fa9ad96d 375
d55c670c
AD		 376 skb->mark = be32_to_cpu(t->parms.i_key);
377 ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family);
378 skb->mark = orig_mark;
379
380 if (!ret)
fa9ad96d
SK		 381 return -EPERM;
382
383 skb_scrub_packet(skb, !net_eq(t->net, dev_net(skb->dev)));
384 skb->dev = dev;
385
386 tstats = this_cpu_ptr(dev->tstats);
387 u64_stats_update_begin(&tstats->syncp);
388 tstats->rx_packets++;
389 tstats->rx_bytes += skb->len;
390 u64_stats_update_end(&tstats->syncp);
391
392 return 0;
393}
394
ed1efb2a
SK		 395/**
396 * vti6_addr_conflict - compare packet addresses to tunnel's own
397 * @t: the outgoing tunnel device
398 * @hdr: IPv6 header from the incoming packet
399 *
400 * Description:
401 * Avoid trivial tunneling loop by checking that tunnel exit-point
402 * doesn't match source of incoming packet.
403 *
404 * Return:
405 * 1 if conflict,
406 * 0 else
407 **/
408static inline bool
409vti6_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
410{
411 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
412}
413
26be8e2d
SK		 414static bool vti6_state_check(const struct xfrm_state *x,
415 const struct in6_addr *dst,
416 const struct in6_addr *src)
417{
418 xfrm_address_t *daddr = (xfrm_address_t *)dst;
419 xfrm_address_t *saddr = (xfrm_address_t *)src;
420
421 /* if there is no transform then this tunnel is not functional.
422 * Or if the xfrm is not mode tunnel.
423 */
424 if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
425 x->props.family != AF_INET6)
426 return false;
427
428 if (ipv6_addr_any(dst))
429 return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET6);
430
431 if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET6))
432 return false;
433
434 return true;
435}
436
ed1efb2a
SK		 437/**
438 * vti6_xmit - send a packet
439 * @skb: the outgoing socket buffer
440 * @dev: the outgoing tunnel device
22e1b23d 441 * @fl: the flow informations for the xfrm_lookup
ed1efb2a 442 **/
22e1b23d
SK		 443static int
444vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
ed1efb2a 445{
ed1efb2a
SK		 446 struct ip6_tnl *t = netdev_priv(dev);
447 struct net_device_stats *stats = &t->dev->stats;
7c852581 448 struct dst_entry *dst = skb_dst(skb);
ed1efb2a 449 struct net_device *tdev;
d5005140 450 struct xfrm_state *x;
36f6ee22 451 int pkt_len = skb->len;
ed1efb2a 452 int err = -1;
ccd740cb 453 int mtu;
ed1efb2a 454
7c852581
SK		 455 if (!dst)
456 goto tx_err_link_failure;
ed1efb2a 457
7c852581 458 dst_hold(dst);
22e1b23d 459 dst = xfrm_lookup(t->net, dst, fl, NULL, 0);
7c852581
SK		 460 if (IS_ERR(dst)) {
461 err = PTR_ERR(dst);
462 dst = NULL;
463 goto tx_err_link_failure;
ed1efb2a
SK		 464 }
465
d5005140
SK		 466 x = dst->xfrm;
467 if (!vti6_state_check(x, &t->parms.raddr, &t->parms.laddr))
468 goto tx_err_link_failure;
469
470 if (!ip6_tnl_xmit_ctl(t, (const struct in6_addr *)&x->props.saddr,
471 (const struct in6_addr *)&x->id.daddr))
ed1efb2a
SK		 472 goto tx_err_link_failure;
473
474 tdev = dst->dev;
475
476 if (tdev == dev) {
477 stats->collisions++;
478 net_warn_ratelimited("%s: Local routing loop detected!\n",
479 t->parms.name);
480 goto tx_err_dst_release;
481 }
482
ccd740cb 483 mtu = dst_mtu(dst);
9f289546 484 if (skb->len > mtu) {
f15ca723 485 skb_dst_update_pmtu(skb, mtu);
ccd740cb 486
e3dc847a
SK		 487 if (skb->protocol == htons(ETH_P_IPV6)) {
488 if (mtu < IPV6_MIN_MTU)
489 mtu = IPV6_MIN_MTU;
490
ccd740cb 491 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
e3dc847a 492 } else {
ccd740cb
SK		 493 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
494 htonl(mtu));
e3dc847a 495 }
ccd740cb 496
d6990976
EB		 497 err = -EMSGSIZE;
498 goto tx_err_dst_release;
ccd740cb
SK		 499 }
500
d6990976
EB		 501 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
502 skb_dst_set(skb, dst);
503 skb->dev = skb_dst(skb)->dev;
504
13206b6b 505 err = dst_output(t->net, skb->sk, skb);
bb107456
HY		 506 if (net_xmit_eval(err) == 0)
507 err = pkt_len;
508 iptunnel_xmit_stats(dev, err);
ed1efb2a
SK		 509
510 return 0;
511tx_err_link_failure:
512 stats->tx_carrier_errors++;
513 dst_link_failure(skb);
514tx_err_dst_release:
7c852581 515 dst_release(dst);
ed1efb2a
SK		 516 return err;
517}
518
519static netdev_tx_t
520vti6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
521{
522 struct ip6_tnl *t = netdev_priv(dev);
523 struct net_device_stats *stats = &t->dev->stats;
22e1b23d
SK		 524 struct ipv6hdr *ipv6h;
525 struct flowi fl;
ed1efb2a
SK		 526 int ret;
527
22e1b23d 528 memset(&fl, 0, sizeof(fl));
22e1b23d 529
ed1efb2a
SK		 530 switch (skb->protocol) {
531 case htons(ETH_P_IPV6):
22e1b23d
SK		 532 ipv6h = ipv6_hdr(skb);
533
534 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
d5005140 535 vti6_addr_conflict(t, ipv6h))
22e1b23d
SK		 536 goto tx_err;
537
538 xfrm_decode_session(skb, &fl, AF_INET6);
539 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
540 break;
541 case htons(ETH_P_IP):
542 xfrm_decode_session(skb, &fl, AF_INET);
543 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
ed1efb2a
SK		 544 break;
545 default:
546 goto tx_err;
547 }
548
cd5279c1
AD		 549 /* override mark with tunnel output key */
550 fl.flowi_mark = be32_to_cpu(t->parms.o_key);
551
22e1b23d 552 ret = vti6_xmit(skb, dev, &fl);
ed1efb2a
SK		 553 if (ret < 0)
554 goto tx_err;
555
556 return NETDEV_TX_OK;
557
558tx_err:
559 stats->tx_errors++;
560 stats->tx_dropped++;
561 kfree_skb(skb);
562 return NETDEV_TX_OK;
563}
564
fa9ad96d
SK		 565static int vti6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
566 u8 type, u8 code, int offset, __be32 info)
567{
568 __be32 spi;
6d004d6c 569 __u32 mark;
fa9ad96d
SK		 570 struct xfrm_state *x;
571 struct ip6_tnl *t;
572 struct ip_esp_hdr *esph;
573 struct ip_auth_hdr *ah;
574 struct ip_comp_hdr *ipch;
575 struct net *net = dev_net(skb->dev);
576 const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
577 int protocol = iph->nexthdr;
578
579 t = vti6_tnl_lookup(dev_net(skb->dev), &iph->daddr, &iph->saddr);
580 if (!t)
581 return -1;
582
6d004d6c
SK		 583 mark = be32_to_cpu(t->parms.o_key);
584
fa9ad96d
SK		 585 switch (protocol) {
586 case IPPROTO_ESP:
587 esph = (struct ip_esp_hdr *)(skb->data + offset);
588 spi = esph->spi;
589 break;
590 case IPPROTO_AH:
591 ah = (struct ip_auth_hdr *)(skb->data + offset);
592 spi = ah->spi;
593 break;
594 case IPPROTO_COMP:
595 ipch = (struct ip_comp_hdr *)(skb->data + offset);
596 spi = htonl(ntohs(ipch->cpi));
597 break;
598 default:
599 return 0;
600 }
601
602 if (type != ICMPV6_PKT_TOOBIG &&
603 type != NDISC_REDIRECT)
604 return 0;
605
6d004d6c 606 x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
fa9ad96d
SK		 607 spi, protocol, AF_INET6);
608 if (!x)
609 return 0;
610
611 if (type == NDISC_REDIRECT)
e2d118a1
LC		 612 ip6_redirect(skb, net, skb->dev->ifindex, 0,
613 sock_net_uid(net, NULL));
fa9ad96d 614 else
e2d118a1 615 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
fa9ad96d
SK		 616 xfrm_state_put(x);
617
618 return 0;
619}
620
7a67e69a 621static void vti6_link_config(struct ip6_tnl *t, bool keep_mtu)
ed1efb2a 622{
ed1efb2a
SK		 623 struct net_device *dev = t->dev;
624 struct __ip6_tnl_parm *p = &t->parms;
53c81e95 625 struct net_device *tdev = NULL;
c6741fbe 626 int mtu;
ed1efb2a
SK		 627
628 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
629 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
630
ed1efb2a
SK		 631 p->flags &= ~(IP6_TNL_F_CAP_XMIT | IP6_TNL_F_CAP_RCV |
632 IP6_TNL_F_CAP_PER_PACKET);
633 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
634
635 if (p->flags & IP6_TNL_F_CAP_XMIT && p->flags & IP6_TNL_F_CAP_RCV)
636 dev->flags |= IFF_POINTOPOINT;
637 else
638 dev->flags &= ~IFF_POINTOPOINT;
53c81e95 639
7a67e69a
SB		 640 if (keep_mtu && dev->mtu) {
641 dev->mtu = clamp(dev->mtu, dev->min_mtu, dev->max_mtu);
642 return;
643 }
644
53c81e95
AK		 645 if (p->flags & IP6_TNL_F_CAP_XMIT) {
646 int strict = (ipv6_addr_type(&p->raddr) &
647 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL));
648 struct rt6_info *rt = rt6_lookup(t->net,
649 &p->raddr, &p->laddr,
b75cc8f9 650 p->link, NULL, strict);
53c81e95
AK		 651
652 if (rt)
653 tdev = rt->dst.dev;
654 ip6_rt_put(rt);
655 }
656
657 if (!tdev && p->link)
658 tdev = __dev_get_by_index(t->net, p->link);
659
660 if (tdev)
c6741fbe
SB		 661 mtu = tdev->mtu - sizeof(struct ipv6hdr);
662 else
663 mtu = ETH_DATA_LEN - LL_MAX_HEADER - sizeof(struct ipv6hdr);
664
b4331a68 665 dev->mtu = max_t(int, mtu, IPV4_MIN_MTU);
ed1efb2a
SK		 666}
667
668/**
669 * vti6_tnl_change - update the tunnel parameters
670 * @t: tunnel to be changed
671 * @p: tunnel configuration parameters
7a67e69a 672 * @keep_mtu: MTU was set from userspace, don't re-compute it
ed1efb2a
SK		 673 *
674 * Description:
675 * vti6_tnl_change() updates the tunnel parameters
676 **/
677static int
7a67e69a
SB		 678vti6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
679 bool keep_mtu)
ed1efb2a
SK		 680{
681 t->parms.laddr = p->laddr;
682 t->parms.raddr = p->raddr;
683 t->parms.link = p->link;
684 t->parms.i_key = p->i_key;
685 t->parms.o_key = p->o_key;
686 t->parms.proto = p->proto;
0a473b82 687 t->parms.fwmark = p->fwmark;
607f725f 688 dst_cache_reset(&t->dst_cache);
7a67e69a 689 vti6_link_config(t, keep_mtu);
ed1efb2a
SK		 690 return 0;
691}
692
7a67e69a
SB		 693static int vti6_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p,
694 bool keep_mtu)
ed1efb2a
SK		 695{
696 struct net *net = dev_net(t->dev);
697 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
698 int err;
699
700 vti6_tnl_unlink(ip6n, t);
701 synchronize_net();
7a67e69a 702 err = vti6_tnl_change(t, p, keep_mtu);
ed1efb2a
SK		 703 vti6_tnl_link(ip6n, t);
704 netdev_state_change(t->dev);
705 return err;
706}
707
708static void
709vti6_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm2 *u)
710{
711 p->laddr = u->laddr;
712 p->raddr = u->raddr;
713 p->link = u->link;
714 p->i_key = u->i_key;
715 p->o_key = u->o_key;
716 p->proto = u->proto;
717
718 memcpy(p->name, u->name, sizeof(u->name));
719}
720
721static void
722vti6_parm_to_user(struct ip6_tnl_parm2 *u, const struct __ip6_tnl_parm *p)
723{
724 u->laddr = p->laddr;
725 u->raddr = p->raddr;
726 u->link = p->link;
727 u->i_key = p->i_key;
728 u->o_key = p->o_key;
7dcdf941
DF		 729 if (u->i_key)
730 u->i_flags |= GRE_KEY;
731 if (u->o_key)
732 u->o_flags |= GRE_KEY;
ed1efb2a
SK		 733 u->proto = p->proto;
734
735 memcpy(u->name, p->name, sizeof(u->name));
736}
737
738/**
154a8c46 739 * vti6_ioctl - configure vti6 tunnels from userspace
ed1efb2a
SK		 740 * @dev: virtual device associated with tunnel
741 * @ifr: parameters passed from userspace
742 * @cmd: command to be performed
743 *
744 * Description:
745 * vti6_ioctl() is used for managing vti6 tunnels
746 * from userspace.
747 *
748 * The possible commands are the following:
749 * %SIOCGETTUNNEL: get tunnel parameters for device
750 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
751 * %SIOCCHGTUNNEL: change tunnel parameters to those given
752 * %SIOCDELTUNNEL: delete tunnel
753 *
754 * The fallback device "ip6_vti0", created during module
755 * initialization, can be used for creating other tunnel devices.
756 *
757 * Return:
758 * 0 on success,
759 * %-EFAULT if unable to copy data to or from userspace,
760 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
761 * %-EINVAL if passed tunnel parameters are invalid,
762 * %-EEXIST if changing a tunnel's parameters would cause a conflict
763 * %-ENODEV if attempting to change or delete a nonexisting device
764 **/
765static int
766vti6_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
767{
768 int err = 0;
769 struct ip6_tnl_parm2 p;
770 struct __ip6_tnl_parm p1;
771 struct ip6_tnl *t = NULL;
772 struct net *net = dev_net(dev);
773 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
774
775 switch (cmd) {
776 case SIOCGETTUNNEL:
777 if (dev == ip6n->fb_tnl_dev) {
778 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
779 err = -EFAULT;
780 break;
781 }
782 vti6_parm_from_user(&p1, &p);
783 t = vti6_locate(net, &p1, 0);
784 } else {
785 memset(&p, 0, sizeof(p));
786 }
63159f29 787 if (!t)
ed1efb2a
SK		 788 t = netdev_priv(dev);
789 vti6_parm_to_user(&p, &t->parms);
790 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
791 err = -EFAULT;
792 break;
793 case SIOCADDTUNNEL:
794 case SIOCCHGTUNNEL:
795 err = -EPERM;
796 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
797 break;
798 err = -EFAULT;
799 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
800 break;
801 err = -EINVAL;
802 if (p.proto != IPPROTO_IPV6 && p.proto != 0)
803 break;
804 vti6_parm_from_user(&p1, &p);
805 t = vti6_locate(net, &p1, cmd == SIOCADDTUNNEL);
806 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
53b24b8f 807 if (t) {
ed1efb2a
SK		 808 if (t->dev != dev) {
809 err = -EEXIST;
810 break;
811 }
812 } else
813 t = netdev_priv(dev);
814
7a67e69a 815 err = vti6_update(t, &p1, false);
ed1efb2a
SK		 816 }
817 if (t) {
818 err = 0;
819 vti6_parm_to_user(&p, &t->parms);
820 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
821 err = -EFAULT;
822
823 } else
824 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
825 break;
826 case SIOCDELTUNNEL:
827 err = -EPERM;
828 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
829 break;
830
831 if (dev == ip6n->fb_tnl_dev) {
832 err = -EFAULT;
833 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
834 break;
835 err = -ENOENT;
836 vti6_parm_from_user(&p1, &p);
837 t = vti6_locate(net, &p1, 0);
63159f29 838 if (!t)
ed1efb2a
SK		 839 break;
840 err = -EPERM;
841 if (t->dev == ip6n->fb_tnl_dev)
842 break;
843 dev = t->dev;
844 }
845 err = 0;
846 unregister_netdevice(dev);
847 break;
848 default:
849 err = -EINVAL;
850 }
851 return err;
852}
853
ed1efb2a 854static const struct net_device_ops vti6_netdev_ops = {
16a0231b 855 .ndo_init = vti6_dev_init,
ed1efb2a
SK		 856 .ndo_uninit = vti6_dev_uninit,
857 .ndo_start_xmit = vti6_tnl_xmit,
858 .ndo_do_ioctl = vti6_ioctl,
469bdcef 859 .ndo_get_stats64 = ip_tunnel_get_stats64,
ecf2c06a 860 .ndo_get_iflink = ip6_tnl_get_iflink,
ed1efb2a
SK		 861};
862
863/**
864 * vti6_dev_setup - setup virtual tunnel device
865 * @dev: virtual device associated with tunnel
866 *
867 * Description:
868 * Initialize function pointers and device parameters
869 **/
870static void vti6_dev_setup(struct net_device *dev)
871{
ed1efb2a 872 dev->netdev_ops = &vti6_netdev_ops;
cf124db5
DM		 873 dev->needs_free_netdev = true;
874 dev->priv_destructor = vti6_dev_free;
ed1efb2a
SK		 875
876 dev->type = ARPHRD_TUNNEL6;
b4331a68 877 dev->min_mtu = IPV4_MIN_MTU;
f8a554b4 878 dev->max_mtu = IP_MAX_MTU - sizeof(struct ipv6hdr);
ed1efb2a
SK		 879 dev->flags |= IFF_NOARP;
880 dev->addr_len = sizeof(struct in6_addr);
02875878 881 netif_keep_dst(dev);
45ce0fd1
FJ		 882 /* This perm addr will be used as interface identifier by IPv6 */
883 dev->addr_assign_type = NET_ADDR_RANDOM;
884 eth_random_addr(dev->perm_addr);
ed1efb2a
SK		 885}
886
887/**
888 * vti6_dev_init_gen - general initializer for all tunnel devices
889 * @dev: virtual device associated with tunnel
890 **/
891static inline int vti6_dev_init_gen(struct net_device *dev)
892{
893 struct ip6_tnl *t = netdev_priv(dev);
894
895 t->dev = dev;
896 t->net = dev_net(dev);
1c213bd2 897 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
ed1efb2a
SK		 898 if (!dev->tstats)
899 return -ENOMEM;
900 return 0;
901}
902
903/**
904 * vti6_dev_init - initializer for all non fallback tunnel devices
905 * @dev: virtual device associated with tunnel
906 **/
907static int vti6_dev_init(struct net_device *dev)
908{
909 struct ip6_tnl *t = netdev_priv(dev);
910 int err = vti6_dev_init_gen(dev);
911
912 if (err)
913 return err;
7a67e69a 914 vti6_link_config(t, true);
ed1efb2a
SK		 915 return 0;
916}
917
918/**
919 * vti6_fb_tnl_dev_init - initializer for fallback tunnel device
920 * @dev: fallback device
921 *
922 * Return: 0
923 **/
924static int __net_init vti6_fb_tnl_dev_init(struct net_device *dev)
925{
926 struct ip6_tnl *t = netdev_priv(dev);
927 struct net *net = dev_net(dev);
928 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
ed1efb2a
SK		 929
930 t->parms.proto = IPPROTO_IPV6;
931 dev_hold(dev);
932
ed1efb2a
SK		 933 rcu_assign_pointer(ip6n->tnls_wc[0], t);
934 return 0;
935}
936
a8b8a889
MS		 937static int vti6_validate(struct nlattr *tb[], struct nlattr *data[],
938 struct netlink_ext_ack *extack)
ed1efb2a
SK		 939{
940 return 0;
941}
942
943static void vti6_netlink_parms(struct nlattr *data[],
944 struct __ip6_tnl_parm *parms)
945{
946 memset(parms, 0, sizeof(*parms));
947
948 if (!data)
949 return;
950
951 if (data[IFLA_VTI_LINK])
952 parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
953
954 if (data[IFLA_VTI_LOCAL])
67b61f6c 955 parms->laddr = nla_get_in6_addr(data[IFLA_VTI_LOCAL]);
ed1efb2a
SK		 956
957 if (data[IFLA_VTI_REMOTE])
67b61f6c 958 parms->raddr = nla_get_in6_addr(data[IFLA_VTI_REMOTE]);
ed1efb2a
SK		 959
960 if (data[IFLA_VTI_IKEY])
961 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
962
963 if (data[IFLA_VTI_OKEY])
964 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
0a473b82
CG		 965
966 if (data[IFLA_VTI_FWMARK])
967 parms->fwmark = nla_get_u32(data[IFLA_VTI_FWMARK]);
ed1efb2a
SK		 968}
969
970static int vti6_newlink(struct net *src_net, struct net_device *dev,
7a3f4a18
MS		 971 struct nlattr *tb[], struct nlattr *data[],
972 struct netlink_ext_ack *extack)
ed1efb2a
SK		 973{
974 struct net *net = dev_net(dev);
975 struct ip6_tnl *nt;
976
977 nt = netdev_priv(dev);
978 vti6_netlink_parms(data, &nt->parms);
979
980 nt->parms.proto = IPPROTO_IPV6;
981
982 if (vti6_locate(net, &nt->parms, 0))
983 return -EEXIST;
984
985 return vti6_tnl_create2(dev);
986}
987
20ea60ca 988static void vti6_dellink(struct net_device *dev, struct list_head *head)
989{
990 struct net *net = dev_net(dev);
991 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
992
993 if (dev != ip6n->fb_tnl_dev)
994 unregister_netdevice_queue(dev, head);
995}
996
ed1efb2a 997static int vti6_changelink(struct net_device *dev, struct nlattr *tb[],
ad744b22
MS		 998 struct nlattr *data[],
999 struct netlink_ext_ack *extack)
ed1efb2a
SK		 1000{
1001 struct ip6_tnl *t;
1002 struct __ip6_tnl_parm p;
1003 struct net *net = dev_net(dev);
1004 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1005
1006 if (dev == ip6n->fb_tnl_dev)
1007 return -EINVAL;
1008
1009 vti6_netlink_parms(data, &p);
1010
1011 t = vti6_locate(net, &p, 0);
1012
1013 if (t) {
1014 if (t->dev != dev)
1015 return -EEXIST;
1016 } else
1017 t = netdev_priv(dev);
1018
7a67e69a 1019 return vti6_update(t, &p, tb && tb[IFLA_MTU]);
ed1efb2a
SK		 1020}
1021
1022static size_t vti6_get_size(const struct net_device *dev)
1023{
1024 return
1025 /* IFLA_VTI_LINK */
1026 nla_total_size(4) +
1027 /* IFLA_VTI_LOCAL */
1028 nla_total_size(sizeof(struct in6_addr)) +
1029 /* IFLA_VTI_REMOTE */
1030 nla_total_size(sizeof(struct in6_addr)) +
1031 /* IFLA_VTI_IKEY */
1032 nla_total_size(4) +
1033 /* IFLA_VTI_OKEY */
1034 nla_total_size(4) +
0a473b82
CG		 1035 /* IFLA_VTI_FWMARK */
1036 nla_total_size(4) +
ed1efb2a
SK		 1037 0;
1038}
1039
1040static int vti6_fill_info(struct sk_buff *skb, const struct net_device *dev)
1041{
1042 struct ip6_tnl *tunnel = netdev_priv(dev);
1043 struct __ip6_tnl_parm *parm = &tunnel->parms;
1044
1045 if (nla_put_u32(skb, IFLA_VTI_LINK, parm->link) ||
930345ea
JB		 1046 nla_put_in6_addr(skb, IFLA_VTI_LOCAL, &parm->laddr) ||
1047 nla_put_in6_addr(skb, IFLA_VTI_REMOTE, &parm->raddr) ||
ed1efb2a 1048 nla_put_be32(skb, IFLA_VTI_IKEY, parm->i_key) ||
0a473b82
CG		 1049 nla_put_be32(skb, IFLA_VTI_OKEY, parm->o_key) ||
1050 nla_put_u32(skb, IFLA_VTI_FWMARK, parm->fwmark))
ed1efb2a
SK		 1051 goto nla_put_failure;
1052 return 0;
1053
1054nla_put_failure:
1055 return -EMSGSIZE;
1056}
1057
1058static const struct nla_policy vti6_policy[IFLA_VTI_MAX + 1] = {
1059 [IFLA_VTI_LINK] = { .type = NLA_U32 },
1060 [IFLA_VTI_LOCAL] = { .len = sizeof(struct in6_addr) },
1061 [IFLA_VTI_REMOTE] = { .len = sizeof(struct in6_addr) },
1062 [IFLA_VTI_IKEY] = { .type = NLA_U32 },
1063 [IFLA_VTI_OKEY] = { .type = NLA_U32 },
0a473b82 1064 [IFLA_VTI_FWMARK] = { .type = NLA_U32 },
ed1efb2a
SK		 1065};
1066
1067static struct rtnl_link_ops vti6_link_ops __read_mostly = {
1068 .kind = "vti6",
1069 .maxtype = IFLA_VTI_MAX,
1070 .policy = vti6_policy,
1071 .priv_size = sizeof(struct ip6_tnl),
1072 .setup = vti6_dev_setup,
1073 .validate = vti6_validate,
1074 .newlink = vti6_newlink,
20ea60ca 1075 .dellink = vti6_dellink,
ed1efb2a
SK		 1076 .changelink = vti6_changelink,
1077 .get_size = vti6_get_size,
1078 .fill_info = vti6_fill_info,
1728d4fa 1079 .get_link_net = ip6_tnl_get_link_net,
ed1efb2a
SK		 1080};
1081
bb401cae
ED		 1082static void __net_exit vti6_destroy_tunnels(struct vti6_net *ip6n,
1083 struct list_head *list)
ed1efb2a
SK		 1084{
1085 int h;
1086 struct ip6_tnl *t;
ed1efb2a 1087
e87a8f24 1088 for (h = 0; h < IP6_VTI_HASH_SIZE; h++) {
ed1efb2a 1089 t = rtnl_dereference(ip6n->tnls_r_l[h]);
53b24b8f 1090 while (t) {
bb401cae 1091 unregister_netdevice_queue(t->dev, list);
ed1efb2a
SK		 1092 t = rtnl_dereference(t->next);
1093 }
1094 }
1095
1096 t = rtnl_dereference(ip6n->tnls_wc[0]);
9c86336c
HY		 1097 if (t)
1098 unregister_netdevice_queue(t->dev, list);
ed1efb2a
SK		 1099}
1100
1101static int __net_init vti6_init_net(struct net *net)
1102{
1103 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1104 struct ip6_tnl *t = NULL;
1105 int err;
1106
1107 ip6n->tnls[0] = ip6n->tnls_wc;
1108 ip6n->tnls[1] = ip6n->tnls_r_l;
1109
e2948e5a
HY		 1110 if (!net_has_fallback_tunnels(net))
1111 return 0;
ed1efb2a
SK		 1112 err = -ENOMEM;
1113 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6_vti0",
c835a677 1114 NET_NAME_UNKNOWN, vti6_dev_setup);
ed1efb2a
SK		 1115
1116 if (!ip6n->fb_tnl_dev)
1117 goto err_alloc_dev;
1118 dev_net_set(ip6n->fb_tnl_dev, net);
20ea60ca 1119 ip6n->fb_tnl_dev->rtnl_link_ops = &vti6_link_ops;
ed1efb2a
SK		 1120
1121 err = vti6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1122 if (err < 0)
1123 goto err_register;
1124
1125 err = register_netdev(ip6n->fb_tnl_dev);
1126 if (err < 0)
1127 goto err_register;
1128
1129 t = netdev_priv(ip6n->fb_tnl_dev);
1130
1131 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
1132 return 0;
1133
1134err_register:
cf124db5 1135 free_netdev(ip6n->fb_tnl_dev);
ed1efb2a
SK		 1136err_alloc_dev:
1137 return err;
1138}
1139
bb401cae 1140static void __net_exit vti6_exit_batch_net(struct list_head *net_list)
ed1efb2a 1141{
bb401cae
ED		 1142 struct vti6_net *ip6n;
1143 struct net *net;
1144 LIST_HEAD(list);
ed1efb2a
SK		 1145
1146 rtnl_lock();
bb401cae
ED		 1147 list_for_each_entry(net, net_list, exit_list) {
1148 ip6n = net_generic(net, vti6_net_id);
1149 vti6_destroy_tunnels(ip6n, &list);
1150 }
1151 unregister_netdevice_many(&list);
ed1efb2a
SK		 1152 rtnl_unlock();
1153}
1154
1155static struct pernet_operations vti6_net_ops = {
1156 .init = vti6_init_net,
bb401cae 1157 .exit_batch = vti6_exit_batch_net,
ed1efb2a
SK		 1158 .id = &vti6_net_id,
1159 .size = sizeof(struct vti6_net),
1160};
1161
fa9ad96d
SK		 1162static struct xfrm6_protocol vti_esp6_protocol __read_mostly = {
1163 .handler = vti6_rcv,
1164 .cb_handler = vti6_rcv_cb,
1165 .err_handler = vti6_err,
1166 .priority = 100,
1167};
1168
1169static struct xfrm6_protocol vti_ah6_protocol __read_mostly = {
1170 .handler = vti6_rcv,
1171 .cb_handler = vti6_rcv_cb,
1172 .err_handler = vti6_err,
1173 .priority = 100,
1174};
1175
1176static struct xfrm6_protocol vti_ipcomp6_protocol __read_mostly = {
1177 .handler = vti6_rcv,
1178 .cb_handler = vti6_rcv_cb,
1179 .err_handler = vti6_err,
1180 .priority = 100,
1181};
1182
ed1efb2a
SK		 1183/**
1184 * vti6_tunnel_init - register protocol and reserve needed resources
1185 *
1186 * Return: 0 on success
1187 **/
1188static int __init vti6_tunnel_init(void)
1189{
e59d82fd
MK		 1190 const char *msg;
1191 int err;
ed1efb2a 1192
e59d82fd 1193 msg = "tunnel device";
ed1efb2a
SK		 1194 err = register_pernet_device(&vti6_net_ops);
1195 if (err < 0)
e59d82fd 1196 goto pernet_dev_failed;
ed1efb2a 1197
e59d82fd 1198 msg = "tunnel protocols";
fa9ad96d 1199 err = xfrm6_protocol_register(&vti_esp6_protocol, IPPROTO_ESP);
e59d82fd
MK		 1200 if (err < 0)
1201 goto xfrm_proto_esp_failed;
fa9ad96d 1202 err = xfrm6_protocol_register(&vti_ah6_protocol, IPPROTO_AH);
e59d82fd
MK		 1203 if (err < 0)
1204 goto xfrm_proto_ah_failed;
fa9ad96d 1205 err = xfrm6_protocol_register(&vti_ipcomp6_protocol, IPPROTO_COMP);
e59d82fd
MK		 1206 if (err < 0)
1207 goto xfrm_proto_comp_failed;
fa9ad96d 1208
e59d82fd 1209 msg = "netlink interface";
ed1efb2a
SK		 1210 err = rtnl_link_register(&vti6_link_ops);
1211 if (err < 0)
1212 goto rtnl_link_failed;
1213
1214 return 0;
1215
1216rtnl_link_failed:
fa9ad96d 1217 xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
e59d82fd 1218xfrm_proto_comp_failed:
fa9ad96d 1219 xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
e59d82fd 1220xfrm_proto_ah_failed:
fa9ad96d 1221 xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
e59d82fd 1222xfrm_proto_esp_failed:
ed1efb2a 1223 unregister_pernet_device(&vti6_net_ops);
e59d82fd
MK		 1224pernet_dev_failed:
1225 pr_err("vti6 init: failed to register %s\n", msg);
ed1efb2a
SK		 1226 return err;
1227}
1228
1229/**
1230 * vti6_tunnel_cleanup - free resources and unregister protocol
1231 **/
1232static void __exit vti6_tunnel_cleanup(void)
1233{
1234 rtnl_link_unregister(&vti6_link_ops);
e59d82fd
MK		 1235 xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1236 xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1237 xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
ed1efb2a
SK		 1238 unregister_pernet_device(&vti6_net_ops);
1239}
1240
1241module_init(vti6_tunnel_init);
1242module_exit(vti6_tunnel_cleanup);
1243MODULE_LICENSE("GPL");
1244MODULE_ALIAS_RTNL_LINK("vti6");
1245MODULE_ALIAS_NETDEV("ip6_vti0");
1246MODULE_AUTHOR("Steffen Klassert");
1247MODULE_DESCRIPTION("IPv6 virtual tunnel interface");
Linux 6.x block layer and io_uring tree(s)