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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>
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>
52#include <linux/etherdevice.h>
53
54#define IP6_VTI_HASH_SIZE_SHIFT 5
55#define IP6_VTI_HASH_SIZE (1 << IP6_VTI_HASH_SIZE_SHIFT)
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
61 return hash_32(hash, IP6_VTI_HASH_SIZE_SHIFT);
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
68static unsigned int vti6_net_id __read_mostly;
69struct vti6_net {
70 /* the vti6 tunnel fallback device */
71 struct net_device *fb_tnl_dev;
72 /* lists for storing tunnels in use */
73 struct ip6_tnl __rcu *tnls_r_l[IP6_VTI_HASH_SIZE];
74 struct ip6_tnl __rcu *tnls_wc[1];
75 struct ip6_tnl __rcu **tnls[2];
76};
77
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);
99 struct in6_addr any;
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 }
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
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);
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
192 dev->rtnl_link_ops = &vti6_link_ops;
193 err = register_netdevice(dev);
194 if (err < 0)
195 goto out;
196
197 strcpy(t->parms.name, dev->name);
198
199 dev_hold(dev);
200 vti6_tnl_link(ip6n, t);
201
202 return 0;
203
204out:
205 return err;
206}
207
208static struct ip6_tnl *vti6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
209{
210 struct net_device *dev;
211 struct ip6_tnl *t;
212 char name[IFNAMSIZ];
213 int err;
214
215 if (p->name[0]) {
216 if (!dev_valid_name(p->name))
217 goto failed;
218 strlcpy(name, p->name, IFNAMSIZ);
219 } else {
220 sprintf(name, "ip6_vti%%d");
221 }
222
223 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, vti6_dev_setup);
224 if (!dev)
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:
240 free_netdev(dev);
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) &&
272 ipv6_addr_equal(remote, &t->parms.raddr)) {
273 if (create)
274 return NULL;
275
276 return t;
277 }
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);
294 struct vti6_net *ip6n = net_generic(t->net, vti6_net_id);
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);
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();
309 t = vti6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr);
310 if (t) {
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
327 rcu_read_unlock();
328
329 return xfrm6_rcv_tnl(skb, t);
330 }
331 rcu_read_unlock();
332 return -EINVAL;
333discard:
334 kfree_skb(skb);
335 return 0;
336}
337
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;
344 struct xfrm_mode *inner_mode;
345 struct ip6_tnl *t = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6;
346 u32 orig_mark = skb->mark;
347 int ret;
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);
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;
375
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)
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
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
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
437/**
438 * vti6_xmit - send a packet
439 * @skb: the outgoing socket buffer
440 * @dev: the outgoing tunnel device
441 * @fl: the flow informations for the xfrm_lookup
442 **/
443static int
444vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
445{
446 struct ip6_tnl *t = netdev_priv(dev);
447 struct net_device_stats *stats = &t->dev->stats;
448 struct dst_entry *dst = skb_dst(skb);
449 struct net_device *tdev;
450 struct xfrm_state *x;
451 int pkt_len = skb->len;
452 int err = -1;
453 int mtu;
454
455 if (!dst)
456 goto tx_err_link_failure;
457
458 dst_hold(dst);
459 dst = xfrm_lookup(t->net, dst, fl, NULL, 0);
460 if (IS_ERR(dst)) {
461 err = PTR_ERR(dst);
462 dst = NULL;
463 goto tx_err_link_failure;
464 }
465
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))
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
483 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
484 skb_dst_set(skb, dst);
485 skb->dev = skb_dst(skb)->dev;
486
487 mtu = dst_mtu(dst);
488 if (!skb->ignore_df && skb->len > mtu) {
489 skb_dst_update_pmtu(skb, mtu);
490
491 if (skb->protocol == htons(ETH_P_IPV6)) {
492 if (mtu < IPV6_MIN_MTU)
493 mtu = IPV6_MIN_MTU;
494
495 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
496 } else {
497 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
498 htonl(mtu));
499 }
500
501 return -EMSGSIZE;
502 }
503
504 err = dst_output(t->net, skb->sk, skb);
505 if (net_xmit_eval(err) == 0) {
506 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
507
508 u64_stats_update_begin(&tstats->syncp);
509 tstats->tx_bytes += pkt_len;
510 tstats->tx_packets++;
511 u64_stats_update_end(&tstats->syncp);
512 } else {
513 stats->tx_errors++;
514 stats->tx_aborted_errors++;
515 }
516
517 return 0;
518tx_err_link_failure:
519 stats->tx_carrier_errors++;
520 dst_link_failure(skb);
521tx_err_dst_release:
522 dst_release(dst);
523 return err;
524}
525
526static netdev_tx_t
527vti6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
528{
529 struct ip6_tnl *t = netdev_priv(dev);
530 struct net_device_stats *stats = &t->dev->stats;
531 struct ipv6hdr *ipv6h;
532 struct flowi fl;
533 int ret;
534
535 memset(&fl, 0, sizeof(fl));
536
537 switch (skb->protocol) {
538 case htons(ETH_P_IPV6):
539 ipv6h = ipv6_hdr(skb);
540
541 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
542 vti6_addr_conflict(t, ipv6h))
543 goto tx_err;
544
545 xfrm_decode_session(skb, &fl, AF_INET6);
546 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
547 break;
548 case htons(ETH_P_IP):
549 xfrm_decode_session(skb, &fl, AF_INET);
550 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
551 break;
552 default:
553 goto tx_err;
554 }
555
556 /* override mark with tunnel output key */
557 fl.flowi_mark = be32_to_cpu(t->parms.o_key);
558
559 ret = vti6_xmit(skb, dev, &fl);
560 if (ret < 0)
561 goto tx_err;
562
563 return NETDEV_TX_OK;
564
565tx_err:
566 stats->tx_errors++;
567 stats->tx_dropped++;
568 kfree_skb(skb);
569 return NETDEV_TX_OK;
570}
571
572static int vti6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
573 u8 type, u8 code, int offset, __be32 info)
574{
575 __be32 spi;
576 __u32 mark;
577 struct xfrm_state *x;
578 struct ip6_tnl *t;
579 struct ip_esp_hdr *esph;
580 struct ip_auth_hdr *ah;
581 struct ip_comp_hdr *ipch;
582 struct net *net = dev_net(skb->dev);
583 const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
584 int protocol = iph->nexthdr;
585
586 t = vti6_tnl_lookup(dev_net(skb->dev), &iph->daddr, &iph->saddr);
587 if (!t)
588 return -1;
589
590 mark = be32_to_cpu(t->parms.o_key);
591
592 switch (protocol) {
593 case IPPROTO_ESP:
594 esph = (struct ip_esp_hdr *)(skb->data + offset);
595 spi = esph->spi;
596 break;
597 case IPPROTO_AH:
598 ah = (struct ip_auth_hdr *)(skb->data + offset);
599 spi = ah->spi;
600 break;
601 case IPPROTO_COMP:
602 ipch = (struct ip_comp_hdr *)(skb->data + offset);
603 spi = htonl(ntohs(ipch->cpi));
604 break;
605 default:
606 return 0;
607 }
608
609 if (type != ICMPV6_PKT_TOOBIG &&
610 type != NDISC_REDIRECT)
611 return 0;
612
613 x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
614 spi, protocol, AF_INET6);
615 if (!x)
616 return 0;
617
618 if (type == NDISC_REDIRECT)
619 ip6_redirect(skb, net, skb->dev->ifindex, 0,
620 sock_net_uid(net, NULL));
621 else
622 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
623 xfrm_state_put(x);
624
625 return 0;
626}
627
628static void vti6_link_config(struct ip6_tnl *t, bool keep_mtu)
629{
630 struct net_device *dev = t->dev;
631 struct __ip6_tnl_parm *p = &t->parms;
632 struct net_device *tdev = NULL;
633 int mtu;
634
635 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
636 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
637
638 p->flags &= ~(IP6_TNL_F_CAP_XMIT | IP6_TNL_F_CAP_RCV |
639 IP6_TNL_F_CAP_PER_PACKET);
640 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
641
642 if (p->flags & IP6_TNL_F_CAP_XMIT && p->flags & IP6_TNL_F_CAP_RCV)
643 dev->flags |= IFF_POINTOPOINT;
644 else
645 dev->flags &= ~IFF_POINTOPOINT;
646
647 if (keep_mtu && dev->mtu) {
648 dev->mtu = clamp(dev->mtu, dev->min_mtu, dev->max_mtu);
649 return;
650 }
651
652 if (p->flags & IP6_TNL_F_CAP_XMIT) {
653 int strict = (ipv6_addr_type(&p->raddr) &
654 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL));
655 struct rt6_info *rt = rt6_lookup(t->net,
656 &p->raddr, &p->laddr,
657 p->link, NULL, strict);
658
659 if (rt)
660 tdev = rt->dst.dev;
661 ip6_rt_put(rt);
662 }
663
664 if (!tdev && p->link)
665 tdev = __dev_get_by_index(t->net, p->link);
666
667 if (tdev)
668 mtu = tdev->mtu - sizeof(struct ipv6hdr);
669 else
670 mtu = ETH_DATA_LEN - LL_MAX_HEADER - sizeof(struct ipv6hdr);
671
672 dev->mtu = max_t(int, mtu, IPV4_MIN_MTU);
673}
674
675/**
676 * vti6_tnl_change - update the tunnel parameters
677 * @t: tunnel to be changed
678 * @p: tunnel configuration parameters
679 * @keep_mtu: MTU was set from userspace, don't re-compute it
680 *
681 * Description:
682 * vti6_tnl_change() updates the tunnel parameters
683 **/
684static int
685vti6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
686 bool keep_mtu)
687{
688 t->parms.laddr = p->laddr;
689 t->parms.raddr = p->raddr;
690 t->parms.link = p->link;
691 t->parms.i_key = p->i_key;
692 t->parms.o_key = p->o_key;
693 t->parms.proto = p->proto;
694 t->parms.fwmark = p->fwmark;
695 dst_cache_reset(&t->dst_cache);
696 vti6_link_config(t, keep_mtu);
697 return 0;
698}
699
700static int vti6_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p,
701 bool keep_mtu)
702{
703 struct net *net = dev_net(t->dev);
704 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
705 int err;
706
707 vti6_tnl_unlink(ip6n, t);
708 synchronize_net();
709 err = vti6_tnl_change(t, p, keep_mtu);
710 vti6_tnl_link(ip6n, t);
711 netdev_state_change(t->dev);
712 return err;
713}
714
715static void
716vti6_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm2 *u)
717{
718 p->laddr = u->laddr;
719 p->raddr = u->raddr;
720 p->link = u->link;
721 p->i_key = u->i_key;
722 p->o_key = u->o_key;
723 p->proto = u->proto;
724
725 memcpy(p->name, u->name, sizeof(u->name));
726}
727
728static void
729vti6_parm_to_user(struct ip6_tnl_parm2 *u, const struct __ip6_tnl_parm *p)
730{
731 u->laddr = p->laddr;
732 u->raddr = p->raddr;
733 u->link = p->link;
734 u->i_key = p->i_key;
735 u->o_key = p->o_key;
736 if (u->i_key)
737 u->i_flags |= GRE_KEY;
738 if (u->o_key)
739 u->o_flags |= GRE_KEY;
740 u->proto = p->proto;
741
742 memcpy(u->name, p->name, sizeof(u->name));
743}
744
745/**
746 * vti6_tnl_ioctl - configure vti6 tunnels from userspace
747 * @dev: virtual device associated with tunnel
748 * @ifr: parameters passed from userspace
749 * @cmd: command to be performed
750 *
751 * Description:
752 * vti6_ioctl() is used for managing vti6 tunnels
753 * from userspace.
754 *
755 * The possible commands are the following:
756 * %SIOCGETTUNNEL: get tunnel parameters for device
757 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
758 * %SIOCCHGTUNNEL: change tunnel parameters to those given
759 * %SIOCDELTUNNEL: delete tunnel
760 *
761 * The fallback device "ip6_vti0", created during module
762 * initialization, can be used for creating other tunnel devices.
763 *
764 * Return:
765 * 0 on success,
766 * %-EFAULT if unable to copy data to or from userspace,
767 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
768 * %-EINVAL if passed tunnel parameters are invalid,
769 * %-EEXIST if changing a tunnel's parameters would cause a conflict
770 * %-ENODEV if attempting to change or delete a nonexisting device
771 **/
772static int
773vti6_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
774{
775 int err = 0;
776 struct ip6_tnl_parm2 p;
777 struct __ip6_tnl_parm p1;
778 struct ip6_tnl *t = NULL;
779 struct net *net = dev_net(dev);
780 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
781
782 switch (cmd) {
783 case SIOCGETTUNNEL:
784 if (dev == ip6n->fb_tnl_dev) {
785 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
786 err = -EFAULT;
787 break;
788 }
789 vti6_parm_from_user(&p1, &p);
790 t = vti6_locate(net, &p1, 0);
791 } else {
792 memset(&p, 0, sizeof(p));
793 }
794 if (!t)
795 t = netdev_priv(dev);
796 vti6_parm_to_user(&p, &t->parms);
797 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
798 err = -EFAULT;
799 break;
800 case SIOCADDTUNNEL:
801 case SIOCCHGTUNNEL:
802 err = -EPERM;
803 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
804 break;
805 err = -EFAULT;
806 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
807 break;
808 err = -EINVAL;
809 if (p.proto != IPPROTO_IPV6 && p.proto != 0)
810 break;
811 vti6_parm_from_user(&p1, &p);
812 t = vti6_locate(net, &p1, cmd == SIOCADDTUNNEL);
813 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
814 if (t) {
815 if (t->dev != dev) {
816 err = -EEXIST;
817 break;
818 }
819 } else
820 t = netdev_priv(dev);
821
822 err = vti6_update(t, &p1, false);
823 }
824 if (t) {
825 err = 0;
826 vti6_parm_to_user(&p, &t->parms);
827 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
828 err = -EFAULT;
829
830 } else
831 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
832 break;
833 case SIOCDELTUNNEL:
834 err = -EPERM;
835 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
836 break;
837
838 if (dev == ip6n->fb_tnl_dev) {
839 err = -EFAULT;
840 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
841 break;
842 err = -ENOENT;
843 vti6_parm_from_user(&p1, &p);
844 t = vti6_locate(net, &p1, 0);
845 if (!t)
846 break;
847 err = -EPERM;
848 if (t->dev == ip6n->fb_tnl_dev)
849 break;
850 dev = t->dev;
851 }
852 err = 0;
853 unregister_netdevice(dev);
854 break;
855 default:
856 err = -EINVAL;
857 }
858 return err;
859}
860
861static const struct net_device_ops vti6_netdev_ops = {
862 .ndo_init = vti6_dev_init,
863 .ndo_uninit = vti6_dev_uninit,
864 .ndo_start_xmit = vti6_tnl_xmit,
865 .ndo_do_ioctl = vti6_ioctl,
866 .ndo_get_stats64 = ip_tunnel_get_stats64,
867 .ndo_get_iflink = ip6_tnl_get_iflink,
868};
869
870/**
871 * vti6_dev_setup - setup virtual tunnel device
872 * @dev: virtual device associated with tunnel
873 *
874 * Description:
875 * Initialize function pointers and device parameters
876 **/
877static void vti6_dev_setup(struct net_device *dev)
878{
879 dev->netdev_ops = &vti6_netdev_ops;
880 dev->needs_free_netdev = true;
881 dev->priv_destructor = vti6_dev_free;
882
883 dev->type = ARPHRD_TUNNEL6;
884 dev->min_mtu = IPV4_MIN_MTU;
885 dev->max_mtu = IP_MAX_MTU - sizeof(struct ipv6hdr);
886 dev->flags |= IFF_NOARP;
887 dev->addr_len = sizeof(struct in6_addr);
888 netif_keep_dst(dev);
889 /* This perm addr will be used as interface identifier by IPv6 */
890 dev->addr_assign_type = NET_ADDR_RANDOM;
891 eth_random_addr(dev->perm_addr);
892}
893
894/**
895 * vti6_dev_init_gen - general initializer for all tunnel devices
896 * @dev: virtual device associated with tunnel
897 **/
898static inline int vti6_dev_init_gen(struct net_device *dev)
899{
900 struct ip6_tnl *t = netdev_priv(dev);
901
902 t->dev = dev;
903 t->net = dev_net(dev);
904 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
905 if (!dev->tstats)
906 return -ENOMEM;
907 return 0;
908}
909
910/**
911 * vti6_dev_init - initializer for all non fallback tunnel devices
912 * @dev: virtual device associated with tunnel
913 **/
914static int vti6_dev_init(struct net_device *dev)
915{
916 struct ip6_tnl *t = netdev_priv(dev);
917 int err = vti6_dev_init_gen(dev);
918
919 if (err)
920 return err;
921 vti6_link_config(t, true);
922 return 0;
923}
924
925/**
926 * vti6_fb_tnl_dev_init - initializer for fallback tunnel device
927 * @dev: fallback device
928 *
929 * Return: 0
930 **/
931static int __net_init vti6_fb_tnl_dev_init(struct net_device *dev)
932{
933 struct ip6_tnl *t = netdev_priv(dev);
934 struct net *net = dev_net(dev);
935 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
936
937 t->parms.proto = IPPROTO_IPV6;
938 dev_hold(dev);
939
940 rcu_assign_pointer(ip6n->tnls_wc[0], t);
941 return 0;
942}
943
944static int vti6_validate(struct nlattr *tb[], struct nlattr *data[],
945 struct netlink_ext_ack *extack)
946{
947 return 0;
948}
949
950static void vti6_netlink_parms(struct nlattr *data[],
951 struct __ip6_tnl_parm *parms)
952{
953 memset(parms, 0, sizeof(*parms));
954
955 if (!data)
956 return;
957
958 if (data[IFLA_VTI_LINK])
959 parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
960
961 if (data[IFLA_VTI_LOCAL])
962 parms->laddr = nla_get_in6_addr(data[IFLA_VTI_LOCAL]);
963
964 if (data[IFLA_VTI_REMOTE])
965 parms->raddr = nla_get_in6_addr(data[IFLA_VTI_REMOTE]);
966
967 if (data[IFLA_VTI_IKEY])
968 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
969
970 if (data[IFLA_VTI_OKEY])
971 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
972
973 if (data[IFLA_VTI_FWMARK])
974 parms->fwmark = nla_get_u32(data[IFLA_VTI_FWMARK]);
975}
976
977static int vti6_newlink(struct net *src_net, struct net_device *dev,
978 struct nlattr *tb[], struct nlattr *data[],
979 struct netlink_ext_ack *extack)
980{
981 struct net *net = dev_net(dev);
982 struct ip6_tnl *nt;
983
984 nt = netdev_priv(dev);
985 vti6_netlink_parms(data, &nt->parms);
986
987 nt->parms.proto = IPPROTO_IPV6;
988
989 if (vti6_locate(net, &nt->parms, 0))
990 return -EEXIST;
991
992 return vti6_tnl_create2(dev);
993}
994
995static void vti6_dellink(struct net_device *dev, struct list_head *head)
996{
997 struct net *net = dev_net(dev);
998 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
999
1000 if (dev != ip6n->fb_tnl_dev)
1001 unregister_netdevice_queue(dev, head);
1002}
1003
1004static int vti6_changelink(struct net_device *dev, struct nlattr *tb[],
1005 struct nlattr *data[],
1006 struct netlink_ext_ack *extack)
1007{
1008 struct ip6_tnl *t;
1009 struct __ip6_tnl_parm p;
1010 struct net *net = dev_net(dev);
1011 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1012
1013 if (dev == ip6n->fb_tnl_dev)
1014 return -EINVAL;
1015
1016 vti6_netlink_parms(data, &p);
1017
1018 t = vti6_locate(net, &p, 0);
1019
1020 if (t) {
1021 if (t->dev != dev)
1022 return -EEXIST;
1023 } else
1024 t = netdev_priv(dev);
1025
1026 return vti6_update(t, &p, tb && tb[IFLA_MTU]);
1027}
1028
1029static size_t vti6_get_size(const struct net_device *dev)
1030{
1031 return
1032 /* IFLA_VTI_LINK */
1033 nla_total_size(4) +
1034 /* IFLA_VTI_LOCAL */
1035 nla_total_size(sizeof(struct in6_addr)) +
1036 /* IFLA_VTI_REMOTE */
1037 nla_total_size(sizeof(struct in6_addr)) +
1038 /* IFLA_VTI_IKEY */
1039 nla_total_size(4) +
1040 /* IFLA_VTI_OKEY */
1041 nla_total_size(4) +
1042 /* IFLA_VTI_FWMARK */
1043 nla_total_size(4) +
1044 0;
1045}
1046
1047static int vti6_fill_info(struct sk_buff *skb, const struct net_device *dev)
1048{
1049 struct ip6_tnl *tunnel = netdev_priv(dev);
1050 struct __ip6_tnl_parm *parm = &tunnel->parms;
1051
1052 if (nla_put_u32(skb, IFLA_VTI_LINK, parm->link) ||
1053 nla_put_in6_addr(skb, IFLA_VTI_LOCAL, &parm->laddr) ||
1054 nla_put_in6_addr(skb, IFLA_VTI_REMOTE, &parm->raddr) ||
1055 nla_put_be32(skb, IFLA_VTI_IKEY, parm->i_key) ||
1056 nla_put_be32(skb, IFLA_VTI_OKEY, parm->o_key) ||
1057 nla_put_u32(skb, IFLA_VTI_FWMARK, parm->fwmark))
1058 goto nla_put_failure;
1059 return 0;
1060
1061nla_put_failure:
1062 return -EMSGSIZE;
1063}
1064
1065static const struct nla_policy vti6_policy[IFLA_VTI_MAX + 1] = {
1066 [IFLA_VTI_LINK] = { .type = NLA_U32 },
1067 [IFLA_VTI_LOCAL] = { .len = sizeof(struct in6_addr) },
1068 [IFLA_VTI_REMOTE] = { .len = sizeof(struct in6_addr) },
1069 [IFLA_VTI_IKEY] = { .type = NLA_U32 },
1070 [IFLA_VTI_OKEY] = { .type = NLA_U32 },
1071 [IFLA_VTI_FWMARK] = { .type = NLA_U32 },
1072};
1073
1074static struct rtnl_link_ops vti6_link_ops __read_mostly = {
1075 .kind = "vti6",
1076 .maxtype = IFLA_VTI_MAX,
1077 .policy = vti6_policy,
1078 .priv_size = sizeof(struct ip6_tnl),
1079 .setup = vti6_dev_setup,
1080 .validate = vti6_validate,
1081 .newlink = vti6_newlink,
1082 .dellink = vti6_dellink,
1083 .changelink = vti6_changelink,
1084 .get_size = vti6_get_size,
1085 .fill_info = vti6_fill_info,
1086 .get_link_net = ip6_tnl_get_link_net,
1087};
1088
1089static void __net_exit vti6_destroy_tunnels(struct vti6_net *ip6n,
1090 struct list_head *list)
1091{
1092 int h;
1093 struct ip6_tnl *t;
1094
1095 for (h = 0; h < IP6_VTI_HASH_SIZE; h++) {
1096 t = rtnl_dereference(ip6n->tnls_r_l[h]);
1097 while (t) {
1098 unregister_netdevice_queue(t->dev, list);
1099 t = rtnl_dereference(t->next);
1100 }
1101 }
1102
1103 t = rtnl_dereference(ip6n->tnls_wc[0]);
1104 unregister_netdevice_queue(t->dev, list);
1105}
1106
1107static int __net_init vti6_init_net(struct net *net)
1108{
1109 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1110 struct ip6_tnl *t = NULL;
1111 int err;
1112
1113 ip6n->tnls[0] = ip6n->tnls_wc;
1114 ip6n->tnls[1] = ip6n->tnls_r_l;
1115
1116 err = -ENOMEM;
1117 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6_vti0",
1118 NET_NAME_UNKNOWN, vti6_dev_setup);
1119
1120 if (!ip6n->fb_tnl_dev)
1121 goto err_alloc_dev;
1122 dev_net_set(ip6n->fb_tnl_dev, net);
1123 ip6n->fb_tnl_dev->rtnl_link_ops = &vti6_link_ops;
1124
1125 err = vti6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1126 if (err < 0)
1127 goto err_register;
1128
1129 err = register_netdev(ip6n->fb_tnl_dev);
1130 if (err < 0)
1131 goto err_register;
1132
1133 t = netdev_priv(ip6n->fb_tnl_dev);
1134
1135 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
1136 return 0;
1137
1138err_register:
1139 free_netdev(ip6n->fb_tnl_dev);
1140err_alloc_dev:
1141 return err;
1142}
1143
1144static void __net_exit vti6_exit_batch_net(struct list_head *net_list)
1145{
1146 struct vti6_net *ip6n;
1147 struct net *net;
1148 LIST_HEAD(list);
1149
1150 rtnl_lock();
1151 list_for_each_entry(net, net_list, exit_list) {
1152 ip6n = net_generic(net, vti6_net_id);
1153 vti6_destroy_tunnels(ip6n, &list);
1154 }
1155 unregister_netdevice_many(&list);
1156 rtnl_unlock();
1157}
1158
1159static struct pernet_operations vti6_net_ops = {
1160 .init = vti6_init_net,
1161 .exit_batch = vti6_exit_batch_net,
1162 .id = &vti6_net_id,
1163 .size = sizeof(struct vti6_net),
1164};
1165
1166static struct xfrm6_protocol vti_esp6_protocol __read_mostly = {
1167 .handler = vti6_rcv,
1168 .cb_handler = vti6_rcv_cb,
1169 .err_handler = vti6_err,
1170 .priority = 100,
1171};
1172
1173static struct xfrm6_protocol vti_ah6_protocol __read_mostly = {
1174 .handler = vti6_rcv,
1175 .cb_handler = vti6_rcv_cb,
1176 .err_handler = vti6_err,
1177 .priority = 100,
1178};
1179
1180static struct xfrm6_protocol vti_ipcomp6_protocol __read_mostly = {
1181 .handler = vti6_rcv,
1182 .cb_handler = vti6_rcv_cb,
1183 .err_handler = vti6_err,
1184 .priority = 100,
1185};
1186
1187/**
1188 * vti6_tunnel_init - register protocol and reserve needed resources
1189 *
1190 * Return: 0 on success
1191 **/
1192static int __init vti6_tunnel_init(void)
1193{
1194 const char *msg;
1195 int err;
1196
1197 msg = "tunnel device";
1198 err = register_pernet_device(&vti6_net_ops);
1199 if (err < 0)
1200 goto pernet_dev_failed;
1201
1202 msg = "tunnel protocols";
1203 err = xfrm6_protocol_register(&vti_esp6_protocol, IPPROTO_ESP);
1204 if (err < 0)
1205 goto xfrm_proto_esp_failed;
1206 err = xfrm6_protocol_register(&vti_ah6_protocol, IPPROTO_AH);
1207 if (err < 0)
1208 goto xfrm_proto_ah_failed;
1209 err = xfrm6_protocol_register(&vti_ipcomp6_protocol, IPPROTO_COMP);
1210 if (err < 0)
1211 goto xfrm_proto_comp_failed;
1212
1213 msg = "netlink interface";
1214 err = rtnl_link_register(&vti6_link_ops);
1215 if (err < 0)
1216 goto rtnl_link_failed;
1217
1218 return 0;
1219
1220rtnl_link_failed:
1221 xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1222xfrm_proto_comp_failed:
1223 xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1224xfrm_proto_ah_failed:
1225 xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1226xfrm_proto_esp_failed:
1227 unregister_pernet_device(&vti6_net_ops);
1228pernet_dev_failed:
1229 pr_err("vti6 init: failed to register %s\n", msg);
1230 return err;
1231}
1232
1233/**
1234 * vti6_tunnel_cleanup - free resources and unregister protocol
1235 **/
1236static void __exit vti6_tunnel_cleanup(void)
1237{
1238 rtnl_link_unregister(&vti6_link_ops);
1239 xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1240 xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1241 xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1242 unregister_pernet_device(&vti6_net_ops);
1243}
1244
1245module_init(vti6_tunnel_init);
1246module_exit(vti6_tunnel_cleanup);
1247MODULE_LICENSE("GPL");
1248MODULE_ALIAS_RTNL_LINK("vti6");
1249MODULE_ALIAS_NETDEV("ip6_vti0");
1250MODULE_AUTHOR("Steffen Klassert");
1251MODULE_DESCRIPTION("IPv6 virtual tunnel interface");
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>
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>
52
53#define HASH_SIZE_SHIFT 5
54#define HASH_SIZE (1 << HASH_SIZE_SHIFT)
55
56static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
57{
58 u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
59
60 return hash_32(hash, HASH_SIZE_SHIFT);
61}
62
63static int vti6_dev_init(struct net_device *dev);
64static void vti6_dev_setup(struct net_device *dev);
65static struct rtnl_link_ops vti6_link_ops __read_mostly;
66
67static int vti6_net_id __read_mostly;
68struct vti6_net {
69 /* the vti6 tunnel fallback device */
70 struct net_device *fb_tnl_dev;
71 /* lists for storing tunnels in use */
72 struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE];
73 struct ip6_tnl __rcu *tnls_wc[1];
74 struct ip6_tnl __rcu **tnls[2];
75};
76
77#define for_each_vti6_tunnel_rcu(start) \
78 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
79
80/**
81 * vti6_tnl_lookup - fetch tunnel matching the end-point addresses
82 * @net: network namespace
83 * @remote: the address of the tunnel exit-point
84 * @local: the address of the tunnel entry-point
85 *
86 * Return:
87 * tunnel matching given end-points if found,
88 * else fallback tunnel if its device is up,
89 * else %NULL
90 **/
91static struct ip6_tnl *
92vti6_tnl_lookup(struct net *net, const struct in6_addr *remote,
93 const struct in6_addr *local)
94{
95 unsigned int hash = HASH(remote, local);
96 struct ip6_tnl *t;
97 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
98
99 for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
100 if (ipv6_addr_equal(local, &t->parms.laddr) &&
101 ipv6_addr_equal(remote, &t->parms.raddr) &&
102 (t->dev->flags & IFF_UP))
103 return t;
104 }
105 t = rcu_dereference(ip6n->tnls_wc[0]);
106 if (t && (t->dev->flags & IFF_UP))
107 return t;
108
109 return NULL;
110}
111
112/**
113 * vti6_tnl_bucket - get head of list matching given tunnel parameters
114 * @p: parameters containing tunnel end-points
115 *
116 * Description:
117 * vti6_tnl_bucket() returns the head of the list matching the
118 * &struct in6_addr entries laddr and raddr in @p.
119 *
120 * Return: head of IPv6 tunnel list
121 **/
122static struct ip6_tnl __rcu **
123vti6_tnl_bucket(struct vti6_net *ip6n, const struct __ip6_tnl_parm *p)
124{
125 const struct in6_addr *remote = &p->raddr;
126 const struct in6_addr *local = &p->laddr;
127 unsigned int h = 0;
128 int prio = 0;
129
130 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
131 prio = 1;
132 h = HASH(remote, local);
133 }
134 return &ip6n->tnls[prio][h];
135}
136
137static void
138vti6_tnl_link(struct vti6_net *ip6n, struct ip6_tnl *t)
139{
140 struct ip6_tnl __rcu **tp = vti6_tnl_bucket(ip6n, &t->parms);
141
142 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
143 rcu_assign_pointer(*tp, t);
144}
145
146static void
147vti6_tnl_unlink(struct vti6_net *ip6n, struct ip6_tnl *t)
148{
149 struct ip6_tnl __rcu **tp;
150 struct ip6_tnl *iter;
151
152 for (tp = vti6_tnl_bucket(ip6n, &t->parms);
153 (iter = rtnl_dereference(*tp)) != NULL;
154 tp = &iter->next) {
155 if (t == iter) {
156 rcu_assign_pointer(*tp, t->next);
157 break;
158 }
159 }
160}
161
162static void vti6_dev_free(struct net_device *dev)
163{
164 free_percpu(dev->tstats);
165 free_netdev(dev);
166}
167
168static int vti6_tnl_create2(struct net_device *dev)
169{
170 struct ip6_tnl *t = netdev_priv(dev);
171 struct net *net = dev_net(dev);
172 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
173 int err;
174
175 err = vti6_dev_init(dev);
176 if (err < 0)
177 goto out;
178
179 err = register_netdevice(dev);
180 if (err < 0)
181 goto out;
182
183 strcpy(t->parms.name, dev->name);
184 dev->rtnl_link_ops = &vti6_link_ops;
185
186 dev_hold(dev);
187 vti6_tnl_link(ip6n, t);
188
189 return 0;
190
191out:
192 return err;
193}
194
195static struct ip6_tnl *vti6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
196{
197 struct net_device *dev;
198 struct ip6_tnl *t;
199 char name[IFNAMSIZ];
200 int err;
201
202 if (p->name[0])
203 strlcpy(name, p->name, IFNAMSIZ);
204 else
205 sprintf(name, "ip6_vti%%d");
206
207 dev = alloc_netdev(sizeof(*t), name, vti6_dev_setup);
208 if (dev == NULL)
209 goto failed;
210
211 dev_net_set(dev, net);
212
213 t = netdev_priv(dev);
214 t->parms = *p;
215 t->net = dev_net(dev);
216
217 err = vti6_tnl_create2(dev);
218 if (err < 0)
219 goto failed_free;
220
221 return t;
222
223failed_free:
224 vti6_dev_free(dev);
225failed:
226 return NULL;
227}
228
229/**
230 * vti6_locate - find or create tunnel matching given parameters
231 * @net: network namespace
232 * @p: tunnel parameters
233 * @create: != 0 if allowed to create new tunnel if no match found
234 *
235 * Description:
236 * vti6_locate() first tries to locate an existing tunnel
237 * based on @parms. If this is unsuccessful, but @create is set a new
238 * tunnel device is created and registered for use.
239 *
240 * Return:
241 * matching tunnel or NULL
242 **/
243static struct ip6_tnl *vti6_locate(struct net *net, struct __ip6_tnl_parm *p,
244 int create)
245{
246 const struct in6_addr *remote = &p->raddr;
247 const struct in6_addr *local = &p->laddr;
248 struct ip6_tnl __rcu **tp;
249 struct ip6_tnl *t;
250 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
251
252 for (tp = vti6_tnl_bucket(ip6n, p);
253 (t = rtnl_dereference(*tp)) != NULL;
254 tp = &t->next) {
255 if (ipv6_addr_equal(local, &t->parms.laddr) &&
256 ipv6_addr_equal(remote, &t->parms.raddr))
257 return t;
258 }
259 if (!create)
260 return NULL;
261 return vti6_tnl_create(net, p);
262}
263
264/**
265 * vti6_dev_uninit - tunnel device uninitializer
266 * @dev: the device to be destroyed
267 *
268 * Description:
269 * vti6_dev_uninit() removes tunnel from its list
270 **/
271static void vti6_dev_uninit(struct net_device *dev)
272{
273 struct ip6_tnl *t = netdev_priv(dev);
274 struct net *net = dev_net(dev);
275 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
276
277 if (dev == ip6n->fb_tnl_dev)
278 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
279 else
280 vti6_tnl_unlink(ip6n, t);
281 dev_put(dev);
282}
283
284static int vti6_rcv(struct sk_buff *skb)
285{
286 struct ip6_tnl *t;
287 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
288
289 rcu_read_lock();
290 if ((t = vti6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr,
291 &ipv6h->daddr)) != NULL) {
292 if (t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) {
293 rcu_read_unlock();
294 goto discard;
295 }
296
297 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
298 rcu_read_unlock();
299 return 0;
300 }
301
302 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) {
303 t->dev->stats.rx_dropped++;
304 rcu_read_unlock();
305 goto discard;
306 }
307
308 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = t;
309 skb->mark = be32_to_cpu(t->parms.i_key);
310
311 rcu_read_unlock();
312
313 return xfrm6_rcv(skb);
314 }
315 rcu_read_unlock();
316 return -EINVAL;
317discard:
318 kfree_skb(skb);
319 return 0;
320}
321
322static int vti6_rcv_cb(struct sk_buff *skb, int err)
323{
324 unsigned short family;
325 struct net_device *dev;
326 struct pcpu_sw_netstats *tstats;
327 struct xfrm_state *x;
328 struct ip6_tnl *t = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6;
329
330 if (!t)
331 return 1;
332
333 dev = t->dev;
334
335 if (err) {
336 dev->stats.rx_errors++;
337 dev->stats.rx_dropped++;
338
339 return 0;
340 }
341
342 x = xfrm_input_state(skb);
343 family = x->inner_mode->afinfo->family;
344
345 if (!xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family))
346 return -EPERM;
347
348 skb_scrub_packet(skb, !net_eq(t->net, dev_net(skb->dev)));
349 skb->dev = dev;
350
351 tstats = this_cpu_ptr(dev->tstats);
352 u64_stats_update_begin(&tstats->syncp);
353 tstats->rx_packets++;
354 tstats->rx_bytes += skb->len;
355 u64_stats_update_end(&tstats->syncp);
356
357 return 0;
358}
359
360/**
361 * vti6_addr_conflict - compare packet addresses to tunnel's own
362 * @t: the outgoing tunnel device
363 * @hdr: IPv6 header from the incoming packet
364 *
365 * Description:
366 * Avoid trivial tunneling loop by checking that tunnel exit-point
367 * doesn't match source of incoming packet.
368 *
369 * Return:
370 * 1 if conflict,
371 * 0 else
372 **/
373static inline bool
374vti6_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
375{
376 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
377}
378
379static bool vti6_state_check(const struct xfrm_state *x,
380 const struct in6_addr *dst,
381 const struct in6_addr *src)
382{
383 xfrm_address_t *daddr = (xfrm_address_t *)dst;
384 xfrm_address_t *saddr = (xfrm_address_t *)src;
385
386 /* if there is no transform then this tunnel is not functional.
387 * Or if the xfrm is not mode tunnel.
388 */
389 if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
390 x->props.family != AF_INET6)
391 return false;
392
393 if (ipv6_addr_any(dst))
394 return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET6);
395
396 if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET6))
397 return false;
398
399 return true;
400}
401
402/**
403 * vti6_xmit - send a packet
404 * @skb: the outgoing socket buffer
405 * @dev: the outgoing tunnel device
406 * @fl: the flow informations for the xfrm_lookup
407 **/
408static int
409vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
410{
411 struct ip6_tnl *t = netdev_priv(dev);
412 struct net_device_stats *stats = &t->dev->stats;
413 struct dst_entry *dst = skb_dst(skb);
414 struct net_device *tdev;
415 int err = -1;
416
417 if (!dst)
418 goto tx_err_link_failure;
419
420 dst_hold(dst);
421 dst = xfrm_lookup(t->net, dst, fl, NULL, 0);
422 if (IS_ERR(dst)) {
423 err = PTR_ERR(dst);
424 dst = NULL;
425 goto tx_err_link_failure;
426 }
427
428 if (!vti6_state_check(dst->xfrm, &t->parms.raddr, &t->parms.laddr))
429 goto tx_err_link_failure;
430
431 tdev = dst->dev;
432
433 if (tdev == dev) {
434 stats->collisions++;
435 net_warn_ratelimited("%s: Local routing loop detected!\n",
436 t->parms.name);
437 goto tx_err_dst_release;
438 }
439
440 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
441 skb_dst_set(skb, dst);
442 skb->dev = skb_dst(skb)->dev;
443
444 err = dst_output(skb);
445 if (net_xmit_eval(err) == 0) {
446 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
447
448 u64_stats_update_begin(&tstats->syncp);
449 tstats->tx_bytes += skb->len;
450 tstats->tx_packets++;
451 u64_stats_update_end(&tstats->syncp);
452 } else {
453 stats->tx_errors++;
454 stats->tx_aborted_errors++;
455 }
456
457 return 0;
458tx_err_link_failure:
459 stats->tx_carrier_errors++;
460 dst_link_failure(skb);
461tx_err_dst_release:
462 dst_release(dst);
463 return err;
464}
465
466static netdev_tx_t
467vti6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
468{
469 struct ip6_tnl *t = netdev_priv(dev);
470 struct net_device_stats *stats = &t->dev->stats;
471 struct ipv6hdr *ipv6h;
472 struct flowi fl;
473 int ret;
474
475 memset(&fl, 0, sizeof(fl));
476 skb->mark = be32_to_cpu(t->parms.o_key);
477
478 switch (skb->protocol) {
479 case htons(ETH_P_IPV6):
480 ipv6h = ipv6_hdr(skb);
481
482 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
483 !ip6_tnl_xmit_ctl(t) || vti6_addr_conflict(t, ipv6h))
484 goto tx_err;
485
486 xfrm_decode_session(skb, &fl, AF_INET6);
487 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
488 break;
489 case htons(ETH_P_IP):
490 xfrm_decode_session(skb, &fl, AF_INET);
491 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
492 break;
493 default:
494 goto tx_err;
495 }
496
497 ret = vti6_xmit(skb, dev, &fl);
498 if (ret < 0)
499 goto tx_err;
500
501 return NETDEV_TX_OK;
502
503tx_err:
504 stats->tx_errors++;
505 stats->tx_dropped++;
506 kfree_skb(skb);
507 return NETDEV_TX_OK;
508}
509
510static int vti6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
511 u8 type, u8 code, int offset, __be32 info)
512{
513 __be32 spi;
514 __u32 mark;
515 struct xfrm_state *x;
516 struct ip6_tnl *t;
517 struct ip_esp_hdr *esph;
518 struct ip_auth_hdr *ah;
519 struct ip_comp_hdr *ipch;
520 struct net *net = dev_net(skb->dev);
521 const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
522 int protocol = iph->nexthdr;
523
524 t = vti6_tnl_lookup(dev_net(skb->dev), &iph->daddr, &iph->saddr);
525 if (!t)
526 return -1;
527
528 mark = be32_to_cpu(t->parms.o_key);
529
530 switch (protocol) {
531 case IPPROTO_ESP:
532 esph = (struct ip_esp_hdr *)(skb->data + offset);
533 spi = esph->spi;
534 break;
535 case IPPROTO_AH:
536 ah = (struct ip_auth_hdr *)(skb->data + offset);
537 spi = ah->spi;
538 break;
539 case IPPROTO_COMP:
540 ipch = (struct ip_comp_hdr *)(skb->data + offset);
541 spi = htonl(ntohs(ipch->cpi));
542 break;
543 default:
544 return 0;
545 }
546
547 if (type != ICMPV6_PKT_TOOBIG &&
548 type != NDISC_REDIRECT)
549 return 0;
550
551 x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
552 spi, protocol, AF_INET6);
553 if (!x)
554 return 0;
555
556 if (type == NDISC_REDIRECT)
557 ip6_redirect(skb, net, skb->dev->ifindex, 0);
558 else
559 ip6_update_pmtu(skb, net, info, 0, 0);
560 xfrm_state_put(x);
561
562 return 0;
563}
564
565static void vti6_link_config(struct ip6_tnl *t)
566{
567 struct net_device *dev = t->dev;
568 struct __ip6_tnl_parm *p = &t->parms;
569
570 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
571 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
572
573 p->flags &= ~(IP6_TNL_F_CAP_XMIT | IP6_TNL_F_CAP_RCV |
574 IP6_TNL_F_CAP_PER_PACKET);
575 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
576
577 if (p->flags & IP6_TNL_F_CAP_XMIT && p->flags & IP6_TNL_F_CAP_RCV)
578 dev->flags |= IFF_POINTOPOINT;
579 else
580 dev->flags &= ~IFF_POINTOPOINT;
581
582 dev->iflink = p->link;
583}
584
585/**
586 * vti6_tnl_change - update the tunnel parameters
587 * @t: tunnel to be changed
588 * @p: tunnel configuration parameters
589 *
590 * Description:
591 * vti6_tnl_change() updates the tunnel parameters
592 **/
593static int
594vti6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
595{
596 t->parms.laddr = p->laddr;
597 t->parms.raddr = p->raddr;
598 t->parms.link = p->link;
599 t->parms.i_key = p->i_key;
600 t->parms.o_key = p->o_key;
601 t->parms.proto = p->proto;
602 ip6_tnl_dst_reset(t);
603 vti6_link_config(t);
604 return 0;
605}
606
607static int vti6_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
608{
609 struct net *net = dev_net(t->dev);
610 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
611 int err;
612
613 vti6_tnl_unlink(ip6n, t);
614 synchronize_net();
615 err = vti6_tnl_change(t, p);
616 vti6_tnl_link(ip6n, t);
617 netdev_state_change(t->dev);
618 return err;
619}
620
621static void
622vti6_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm2 *u)
623{
624 p->laddr = u->laddr;
625 p->raddr = u->raddr;
626 p->link = u->link;
627 p->i_key = u->i_key;
628 p->o_key = u->o_key;
629 p->proto = u->proto;
630
631 memcpy(p->name, u->name, sizeof(u->name));
632}
633
634static void
635vti6_parm_to_user(struct ip6_tnl_parm2 *u, const struct __ip6_tnl_parm *p)
636{
637 u->laddr = p->laddr;
638 u->raddr = p->raddr;
639 u->link = p->link;
640 u->i_key = p->i_key;
641 u->o_key = p->o_key;
642 u->proto = p->proto;
643
644 memcpy(u->name, p->name, sizeof(u->name));
645}
646
647/**
648 * vti6_tnl_ioctl - configure vti6 tunnels from userspace
649 * @dev: virtual device associated with tunnel
650 * @ifr: parameters passed from userspace
651 * @cmd: command to be performed
652 *
653 * Description:
654 * vti6_ioctl() is used for managing vti6 tunnels
655 * from userspace.
656 *
657 * The possible commands are the following:
658 * %SIOCGETTUNNEL: get tunnel parameters for device
659 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
660 * %SIOCCHGTUNNEL: change tunnel parameters to those given
661 * %SIOCDELTUNNEL: delete tunnel
662 *
663 * The fallback device "ip6_vti0", created during module
664 * initialization, can be used for creating other tunnel devices.
665 *
666 * Return:
667 * 0 on success,
668 * %-EFAULT if unable to copy data to or from userspace,
669 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
670 * %-EINVAL if passed tunnel parameters are invalid,
671 * %-EEXIST if changing a tunnel's parameters would cause a conflict
672 * %-ENODEV if attempting to change or delete a nonexisting device
673 **/
674static int
675vti6_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
676{
677 int err = 0;
678 struct ip6_tnl_parm2 p;
679 struct __ip6_tnl_parm p1;
680 struct ip6_tnl *t = NULL;
681 struct net *net = dev_net(dev);
682 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
683
684 switch (cmd) {
685 case SIOCGETTUNNEL:
686 if (dev == ip6n->fb_tnl_dev) {
687 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
688 err = -EFAULT;
689 break;
690 }
691 vti6_parm_from_user(&p1, &p);
692 t = vti6_locate(net, &p1, 0);
693 } else {
694 memset(&p, 0, sizeof(p));
695 }
696 if (t == NULL)
697 t = netdev_priv(dev);
698 vti6_parm_to_user(&p, &t->parms);
699 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
700 err = -EFAULT;
701 break;
702 case SIOCADDTUNNEL:
703 case SIOCCHGTUNNEL:
704 err = -EPERM;
705 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
706 break;
707 err = -EFAULT;
708 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
709 break;
710 err = -EINVAL;
711 if (p.proto != IPPROTO_IPV6 && p.proto != 0)
712 break;
713 vti6_parm_from_user(&p1, &p);
714 t = vti6_locate(net, &p1, cmd == SIOCADDTUNNEL);
715 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
716 if (t != NULL) {
717 if (t->dev != dev) {
718 err = -EEXIST;
719 break;
720 }
721 } else
722 t = netdev_priv(dev);
723
724 err = vti6_update(t, &p1);
725 }
726 if (t) {
727 err = 0;
728 vti6_parm_to_user(&p, &t->parms);
729 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
730 err = -EFAULT;
731
732 } else
733 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
734 break;
735 case SIOCDELTUNNEL:
736 err = -EPERM;
737 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
738 break;
739
740 if (dev == ip6n->fb_tnl_dev) {
741 err = -EFAULT;
742 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
743 break;
744 err = -ENOENT;
745 vti6_parm_from_user(&p1, &p);
746 t = vti6_locate(net, &p1, 0);
747 if (t == NULL)
748 break;
749 err = -EPERM;
750 if (t->dev == ip6n->fb_tnl_dev)
751 break;
752 dev = t->dev;
753 }
754 err = 0;
755 unregister_netdevice(dev);
756 break;
757 default:
758 err = -EINVAL;
759 }
760 return err;
761}
762
763/**
764 * vti6_tnl_change_mtu - change mtu manually for tunnel device
765 * @dev: virtual device associated with tunnel
766 * @new_mtu: the new mtu
767 *
768 * Return:
769 * 0 on success,
770 * %-EINVAL if mtu too small
771 **/
772static int vti6_change_mtu(struct net_device *dev, int new_mtu)
773{
774 if (new_mtu < IPV6_MIN_MTU)
775 return -EINVAL;
776
777 dev->mtu = new_mtu;
778 return 0;
779}
780
781static const struct net_device_ops vti6_netdev_ops = {
782 .ndo_uninit = vti6_dev_uninit,
783 .ndo_start_xmit = vti6_tnl_xmit,
784 .ndo_do_ioctl = vti6_ioctl,
785 .ndo_change_mtu = vti6_change_mtu,
786 .ndo_get_stats64 = ip_tunnel_get_stats64,
787};
788
789/**
790 * vti6_dev_setup - setup virtual tunnel device
791 * @dev: virtual device associated with tunnel
792 *
793 * Description:
794 * Initialize function pointers and device parameters
795 **/
796static void vti6_dev_setup(struct net_device *dev)
797{
798 struct ip6_tnl *t;
799
800 dev->netdev_ops = &vti6_netdev_ops;
801 dev->destructor = vti6_dev_free;
802
803 dev->type = ARPHRD_TUNNEL6;
804 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr);
805 dev->mtu = ETH_DATA_LEN;
806 t = netdev_priv(dev);
807 dev->flags |= IFF_NOARP;
808 dev->addr_len = sizeof(struct in6_addr);
809 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
810}
811
812/**
813 * vti6_dev_init_gen - general initializer for all tunnel devices
814 * @dev: virtual device associated with tunnel
815 **/
816static inline int vti6_dev_init_gen(struct net_device *dev)
817{
818 struct ip6_tnl *t = netdev_priv(dev);
819
820 t->dev = dev;
821 t->net = dev_net(dev);
822 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
823 if (!dev->tstats)
824 return -ENOMEM;
825 return 0;
826}
827
828/**
829 * vti6_dev_init - initializer for all non fallback tunnel devices
830 * @dev: virtual device associated with tunnel
831 **/
832static int vti6_dev_init(struct net_device *dev)
833{
834 struct ip6_tnl *t = netdev_priv(dev);
835 int err = vti6_dev_init_gen(dev);
836
837 if (err)
838 return err;
839 vti6_link_config(t);
840 return 0;
841}
842
843/**
844 * vti6_fb_tnl_dev_init - initializer for fallback tunnel device
845 * @dev: fallback device
846 *
847 * Return: 0
848 **/
849static int __net_init vti6_fb_tnl_dev_init(struct net_device *dev)
850{
851 struct ip6_tnl *t = netdev_priv(dev);
852 struct net *net = dev_net(dev);
853 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
854 int err = vti6_dev_init_gen(dev);
855
856 if (err)
857 return err;
858
859 t->parms.proto = IPPROTO_IPV6;
860 dev_hold(dev);
861
862 vti6_link_config(t);
863
864 rcu_assign_pointer(ip6n->tnls_wc[0], t);
865 return 0;
866}
867
868static int vti6_validate(struct nlattr *tb[], struct nlattr *data[])
869{
870 return 0;
871}
872
873static void vti6_netlink_parms(struct nlattr *data[],
874 struct __ip6_tnl_parm *parms)
875{
876 memset(parms, 0, sizeof(*parms));
877
878 if (!data)
879 return;
880
881 if (data[IFLA_VTI_LINK])
882 parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
883
884 if (data[IFLA_VTI_LOCAL])
885 nla_memcpy(&parms->laddr, data[IFLA_VTI_LOCAL],
886 sizeof(struct in6_addr));
887
888 if (data[IFLA_VTI_REMOTE])
889 nla_memcpy(&parms->raddr, data[IFLA_VTI_REMOTE],
890 sizeof(struct in6_addr));
891
892 if (data[IFLA_VTI_IKEY])
893 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
894
895 if (data[IFLA_VTI_OKEY])
896 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
897}
898
899static int vti6_newlink(struct net *src_net, struct net_device *dev,
900 struct nlattr *tb[], struct nlattr *data[])
901{
902 struct net *net = dev_net(dev);
903 struct ip6_tnl *nt;
904
905 nt = netdev_priv(dev);
906 vti6_netlink_parms(data, &nt->parms);
907
908 nt->parms.proto = IPPROTO_IPV6;
909
910 if (vti6_locate(net, &nt->parms, 0))
911 return -EEXIST;
912
913 return vti6_tnl_create2(dev);
914}
915
916static int vti6_changelink(struct net_device *dev, struct nlattr *tb[],
917 struct nlattr *data[])
918{
919 struct ip6_tnl *t;
920 struct __ip6_tnl_parm p;
921 struct net *net = dev_net(dev);
922 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
923
924 if (dev == ip6n->fb_tnl_dev)
925 return -EINVAL;
926
927 vti6_netlink_parms(data, &p);
928
929 t = vti6_locate(net, &p, 0);
930
931 if (t) {
932 if (t->dev != dev)
933 return -EEXIST;
934 } else
935 t = netdev_priv(dev);
936
937 return vti6_update(t, &p);
938}
939
940static size_t vti6_get_size(const struct net_device *dev)
941{
942 return
943 /* IFLA_VTI_LINK */
944 nla_total_size(4) +
945 /* IFLA_VTI_LOCAL */
946 nla_total_size(sizeof(struct in6_addr)) +
947 /* IFLA_VTI_REMOTE */
948 nla_total_size(sizeof(struct in6_addr)) +
949 /* IFLA_VTI_IKEY */
950 nla_total_size(4) +
951 /* IFLA_VTI_OKEY */
952 nla_total_size(4) +
953 0;
954}
955
956static int vti6_fill_info(struct sk_buff *skb, const struct net_device *dev)
957{
958 struct ip6_tnl *tunnel = netdev_priv(dev);
959 struct __ip6_tnl_parm *parm = &tunnel->parms;
960
961 if (nla_put_u32(skb, IFLA_VTI_LINK, parm->link) ||
962 nla_put(skb, IFLA_VTI_LOCAL, sizeof(struct in6_addr),
963 &parm->laddr) ||
964 nla_put(skb, IFLA_VTI_REMOTE, sizeof(struct in6_addr),
965 &parm->raddr) ||
966 nla_put_be32(skb, IFLA_VTI_IKEY, parm->i_key) ||
967 nla_put_be32(skb, IFLA_VTI_OKEY, parm->o_key))
968 goto nla_put_failure;
969 return 0;
970
971nla_put_failure:
972 return -EMSGSIZE;
973}
974
975static const struct nla_policy vti6_policy[IFLA_VTI_MAX + 1] = {
976 [IFLA_VTI_LINK] = { .type = NLA_U32 },
977 [IFLA_VTI_LOCAL] = { .len = sizeof(struct in6_addr) },
978 [IFLA_VTI_REMOTE] = { .len = sizeof(struct in6_addr) },
979 [IFLA_VTI_IKEY] = { .type = NLA_U32 },
980 [IFLA_VTI_OKEY] = { .type = NLA_U32 },
981};
982
983static struct rtnl_link_ops vti6_link_ops __read_mostly = {
984 .kind = "vti6",
985 .maxtype = IFLA_VTI_MAX,
986 .policy = vti6_policy,
987 .priv_size = sizeof(struct ip6_tnl),
988 .setup = vti6_dev_setup,
989 .validate = vti6_validate,
990 .newlink = vti6_newlink,
991 .changelink = vti6_changelink,
992 .get_size = vti6_get_size,
993 .fill_info = vti6_fill_info,
994};
995
996static void __net_exit vti6_destroy_tunnels(struct vti6_net *ip6n)
997{
998 int h;
999 struct ip6_tnl *t;
1000 LIST_HEAD(list);
1001
1002 for (h = 0; h < HASH_SIZE; h++) {
1003 t = rtnl_dereference(ip6n->tnls_r_l[h]);
1004 while (t != NULL) {
1005 unregister_netdevice_queue(t->dev, &list);
1006 t = rtnl_dereference(t->next);
1007 }
1008 }
1009
1010 t = rtnl_dereference(ip6n->tnls_wc[0]);
1011 unregister_netdevice_queue(t->dev, &list);
1012 unregister_netdevice_many(&list);
1013}
1014
1015static int __net_init vti6_init_net(struct net *net)
1016{
1017 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1018 struct ip6_tnl *t = NULL;
1019 int err;
1020
1021 ip6n->tnls[0] = ip6n->tnls_wc;
1022 ip6n->tnls[1] = ip6n->tnls_r_l;
1023
1024 err = -ENOMEM;
1025 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6_vti0",
1026 vti6_dev_setup);
1027
1028 if (!ip6n->fb_tnl_dev)
1029 goto err_alloc_dev;
1030 dev_net_set(ip6n->fb_tnl_dev, net);
1031
1032 err = vti6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1033 if (err < 0)
1034 goto err_register;
1035
1036 err = register_netdev(ip6n->fb_tnl_dev);
1037 if (err < 0)
1038 goto err_register;
1039
1040 t = netdev_priv(ip6n->fb_tnl_dev);
1041
1042 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
1043 return 0;
1044
1045err_register:
1046 vti6_dev_free(ip6n->fb_tnl_dev);
1047err_alloc_dev:
1048 return err;
1049}
1050
1051static void __net_exit vti6_exit_net(struct net *net)
1052{
1053 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1054
1055 rtnl_lock();
1056 vti6_destroy_tunnels(ip6n);
1057 rtnl_unlock();
1058}
1059
1060static struct pernet_operations vti6_net_ops = {
1061 .init = vti6_init_net,
1062 .exit = vti6_exit_net,
1063 .id = &vti6_net_id,
1064 .size = sizeof(struct vti6_net),
1065};
1066
1067static struct xfrm6_protocol vti_esp6_protocol __read_mostly = {
1068 .handler = vti6_rcv,
1069 .cb_handler = vti6_rcv_cb,
1070 .err_handler = vti6_err,
1071 .priority = 100,
1072};
1073
1074static struct xfrm6_protocol vti_ah6_protocol __read_mostly = {
1075 .handler = vti6_rcv,
1076 .cb_handler = vti6_rcv_cb,
1077 .err_handler = vti6_err,
1078 .priority = 100,
1079};
1080
1081static struct xfrm6_protocol vti_ipcomp6_protocol __read_mostly = {
1082 .handler = vti6_rcv,
1083 .cb_handler = vti6_rcv_cb,
1084 .err_handler = vti6_err,
1085 .priority = 100,
1086};
1087
1088/**
1089 * vti6_tunnel_init - register protocol and reserve needed resources
1090 *
1091 * Return: 0 on success
1092 **/
1093static int __init vti6_tunnel_init(void)
1094{
1095 int err;
1096
1097 err = register_pernet_device(&vti6_net_ops);
1098 if (err < 0)
1099 goto out_pernet;
1100
1101 err = xfrm6_protocol_register(&vti_esp6_protocol, IPPROTO_ESP);
1102 if (err < 0) {
1103 pr_err("%s: can't register vti6 protocol\n", __func__);
1104
1105 goto out;
1106 }
1107
1108 err = xfrm6_protocol_register(&vti_ah6_protocol, IPPROTO_AH);
1109 if (err < 0) {
1110 xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1111 pr_err("%s: can't register vti6 protocol\n", __func__);
1112
1113 goto out;
1114 }
1115
1116 err = xfrm6_protocol_register(&vti_ipcomp6_protocol, IPPROTO_COMP);
1117 if (err < 0) {
1118 xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1119 xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1120 pr_err("%s: can't register vti6 protocol\n", __func__);
1121
1122 goto out;
1123 }
1124
1125 err = rtnl_link_register(&vti6_link_ops);
1126 if (err < 0)
1127 goto rtnl_link_failed;
1128
1129 return 0;
1130
1131rtnl_link_failed:
1132 xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1133 xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1134 xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1135out:
1136 unregister_pernet_device(&vti6_net_ops);
1137out_pernet:
1138 return err;
1139}
1140
1141/**
1142 * vti6_tunnel_cleanup - free resources and unregister protocol
1143 **/
1144static void __exit vti6_tunnel_cleanup(void)
1145{
1146 rtnl_link_unregister(&vti6_link_ops);
1147 if (xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP))
1148 pr_info("%s: can't deregister protocol\n", __func__);
1149 if (xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH))
1150 pr_info("%s: can't deregister protocol\n", __func__);
1151 if (xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP))
1152 pr_info("%s: can't deregister protocol\n", __func__);
1153
1154 unregister_pernet_device(&vti6_net_ops);
1155}
1156
1157module_init(vti6_tunnel_init);
1158module_exit(vti6_tunnel_cleanup);
1159MODULE_LICENSE("GPL");
1160MODULE_ALIAS_RTNL_LINK("vti6");
1161MODULE_ALIAS_NETDEV("ip6_vti0");
1162MODULE_AUTHOR("Steffen Klassert");
1163MODULE_DESCRIPTION("IPv6 virtual tunnel interface");