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Merge tag 'trace-seq-buf-3.19' of git://git.kernel.org/pub/scm/linux/kernel/git/roste...
[deliverable/linux.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>
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
ed1efb2a
SK		 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
ed1efb2a
SK		 175 err = register_netdevice(dev);
176 if (err < 0)
177 goto out;
178
179 strcpy(t->parms.name, dev->name);
180 dev->rtnl_link_ops = &vti6_link_ops;
181
182 dev_hold(dev);
183 vti6_tnl_link(ip6n, t);
184
185 return 0;
186
187out:
188 return err;
189}
190
191static struct ip6_tnl *vti6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
192{
193 struct net_device *dev;
194 struct ip6_tnl *t;
195 char name[IFNAMSIZ];
196 int err;
197
198 if (p->name[0])
199 strlcpy(name, p->name, IFNAMSIZ);
200 else
201 sprintf(name, "ip6_vti%%d");
202
c835a677 203 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, vti6_dev_setup);
ed1efb2a
SK		 204 if (dev == NULL)
205 goto failed;
206
207 dev_net_set(dev, net);
208
209 t = netdev_priv(dev);
210 t->parms = *p;
211 t->net = dev_net(dev);
212
213 err = vti6_tnl_create2(dev);
214 if (err < 0)
215 goto failed_free;
216
217 return t;
218
219failed_free:
220 vti6_dev_free(dev);
221failed:
222 return NULL;
223}
224
225/**
226 * vti6_locate - find or create tunnel matching given parameters
227 * @net: network namespace
228 * @p: tunnel parameters
229 * @create: != 0 if allowed to create new tunnel if no match found
230 *
231 * Description:
232 * vti6_locate() first tries to locate an existing tunnel
233 * based on @parms. If this is unsuccessful, but @create is set a new
234 * tunnel device is created and registered for use.
235 *
236 * Return:
237 * matching tunnel or NULL
238 **/
239static struct ip6_tnl *vti6_locate(struct net *net, struct __ip6_tnl_parm *p,
240 int create)
241{
242 const struct in6_addr *remote = &p->raddr;
243 const struct in6_addr *local = &p->laddr;
244 struct ip6_tnl __rcu **tp;
245 struct ip6_tnl *t;
246 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
247
248 for (tp = vti6_tnl_bucket(ip6n, p);
249 (t = rtnl_dereference(*tp)) != NULL;
250 tp = &t->next) {
251 if (ipv6_addr_equal(local, &t->parms.laddr) &&
d814b847
SK		 252 ipv6_addr_equal(remote, &t->parms.raddr)) {
253 if (create)
254 return NULL;
255
ed1efb2a 256 return t;
d814b847 257 }
ed1efb2a
SK		 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);
ed1efb2a
SK		 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();
ed1efb2a
SK		 290 if ((t = vti6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr,
291 &ipv6h->daddr)) != NULL) {
ed1efb2a
SK		 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
fa9ad96d
SK		 308 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = t;
309 skb->mark = be32_to_cpu(t->parms.i_key);
ed1efb2a
SK		 310
311 rcu_read_unlock();
fa9ad96d
SK		 312
313 return xfrm6_rcv(skb);
ed1efb2a
SK		 314 }
315 rcu_read_unlock();
fa9ad96d 316 return -EINVAL;
ed1efb2a
SK		 317discard:
318 kfree_skb(skb);
319 return 0;
320}
321
fa9ad96d
SK		 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
ed1efb2a
SK		 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
26be8e2d
SK		 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
ed1efb2a
SK		 402/**
403 * vti6_xmit - send a packet
404 * @skb: the outgoing socket buffer
405 * @dev: the outgoing tunnel device
22e1b23d 406 * @fl: the flow informations for the xfrm_lookup
ed1efb2a 407 **/
22e1b23d
SK		 408static int
409vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
ed1efb2a 410{
ed1efb2a
SK		 411 struct ip6_tnl *t = netdev_priv(dev);
412 struct net_device_stats *stats = &t->dev->stats;
7c852581 413 struct dst_entry *dst = skb_dst(skb);
ed1efb2a
SK		 414 struct net_device *tdev;
415 int err = -1;
416
7c852581
SK		 417 if (!dst)
418 goto tx_err_link_failure;
ed1efb2a 419
7c852581 420 dst_hold(dst);
22e1b23d 421 dst = xfrm_lookup(t->net, dst, fl, NULL, 0);
7c852581
SK		 422 if (IS_ERR(dst)) {
423 err = PTR_ERR(dst);
424 dst = NULL;
425 goto tx_err_link_failure;
ed1efb2a
SK		 426 }
427
26be8e2d 428 if (!vti6_state_check(dst->xfrm, &t->parms.raddr, &t->parms.laddr))
ed1efb2a
SK		 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
7c852581
SK		 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;
ed1efb2a 443
22e1b23d
SK		 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 }
ed1efb2a
SK		 456
457 return 0;
458tx_err_link_failure:
459 stats->tx_carrier_errors++;
460 dst_link_failure(skb);
461tx_err_dst_release:
7c852581 462 dst_release(dst);
ed1efb2a
SK		 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;
22e1b23d
SK		 471 struct ipv6hdr *ipv6h;
472 struct flowi fl;
ed1efb2a
SK		 473 int ret;
474
22e1b23d
SK		 475 memset(&fl, 0, sizeof(fl));
476 skb->mark = be32_to_cpu(t->parms.o_key);
477
ed1efb2a
SK		 478 switch (skb->protocol) {
479 case htons(ETH_P_IPV6):
22e1b23d
SK		 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)));
ed1efb2a
SK		 492 break;
493 default:
494 goto tx_err;
495 }
496
22e1b23d 497 ret = vti6_xmit(skb, dev, &fl);
ed1efb2a
SK		 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
fa9ad96d
SK		 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;
6d004d6c 514 __u32 mark;
fa9ad96d
SK		 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
6d004d6c
SK		 528 mark = be32_to_cpu(t->parms.o_key);
529
fa9ad96d
SK		 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
6d004d6c 551 x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
fa9ad96d
SK		 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
ed1efb2a
SK		 565static void vti6_link_config(struct ip6_tnl *t)
566{
ed1efb2a
SK		 567 struct net_device *dev = t->dev;
568 struct __ip6_tnl_parm *p = &t->parms;
ed1efb2a
SK		 569
570 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
571 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
572
ed1efb2a
SK		 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;
ed1efb2a
SK		 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 = {
16a0231b 782 .ndo_init = vti6_dev_init,
ed1efb2a
SK		 783 .ndo_uninit = vti6_dev_uninit,
784 .ndo_start_xmit = vti6_tnl_xmit,
785 .ndo_do_ioctl = vti6_ioctl,
786 .ndo_change_mtu = vti6_change_mtu,
469bdcef 787 .ndo_get_stats64 = ip_tunnel_get_stats64,
ed1efb2a
SK		 788};
789
790/**
791 * vti6_dev_setup - setup virtual tunnel device
792 * @dev: virtual device associated with tunnel
793 *
794 * Description:
795 * Initialize function pointers and device parameters
796 **/
797static void vti6_dev_setup(struct net_device *dev)
798{
ed1efb2a
SK		 799 dev->netdev_ops = &vti6_netdev_ops;
800 dev->destructor = vti6_dev_free;
801
802 dev->type = ARPHRD_TUNNEL6;
803 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr);
804 dev->mtu = ETH_DATA_LEN;
ed1efb2a
SK		 805 dev->flags |= IFF_NOARP;
806 dev->addr_len = sizeof(struct in6_addr);
02875878 807 netif_keep_dst(dev);
ed1efb2a
SK		 808}
809
810/**
811 * vti6_dev_init_gen - general initializer for all tunnel devices
812 * @dev: virtual device associated with tunnel
813 **/
814static inline int vti6_dev_init_gen(struct net_device *dev)
815{
816 struct ip6_tnl *t = netdev_priv(dev);
817
818 t->dev = dev;
819 t->net = dev_net(dev);
1c213bd2 820 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
ed1efb2a
SK		 821 if (!dev->tstats)
822 return -ENOMEM;
823 return 0;
824}
825
826/**
827 * vti6_dev_init - initializer for all non fallback tunnel devices
828 * @dev: virtual device associated with tunnel
829 **/
830static int vti6_dev_init(struct net_device *dev)
831{
832 struct ip6_tnl *t = netdev_priv(dev);
833 int err = vti6_dev_init_gen(dev);
834
835 if (err)
836 return err;
837 vti6_link_config(t);
838 return 0;
839}
840
841/**
842 * vti6_fb_tnl_dev_init - initializer for fallback tunnel device
843 * @dev: fallback device
844 *
845 * Return: 0
846 **/
847static int __net_init vti6_fb_tnl_dev_init(struct net_device *dev)
848{
849 struct ip6_tnl *t = netdev_priv(dev);
850 struct net *net = dev_net(dev);
851 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
ed1efb2a
SK		 852
853 t->parms.proto = IPPROTO_IPV6;
854 dev_hold(dev);
855
ed1efb2a
SK		 856 rcu_assign_pointer(ip6n->tnls_wc[0], t);
857 return 0;
858}
859
860static int vti6_validate(struct nlattr *tb[], struct nlattr *data[])
861{
862 return 0;
863}
864
865static void vti6_netlink_parms(struct nlattr *data[],
866 struct __ip6_tnl_parm *parms)
867{
868 memset(parms, 0, sizeof(*parms));
869
870 if (!data)
871 return;
872
873 if (data[IFLA_VTI_LINK])
874 parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
875
876 if (data[IFLA_VTI_LOCAL])
877 nla_memcpy(&parms->laddr, data[IFLA_VTI_LOCAL],
878 sizeof(struct in6_addr));
879
880 if (data[IFLA_VTI_REMOTE])
881 nla_memcpy(&parms->raddr, data[IFLA_VTI_REMOTE],
882 sizeof(struct in6_addr));
883
884 if (data[IFLA_VTI_IKEY])
885 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
886
887 if (data[IFLA_VTI_OKEY])
888 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
889}
890
891static int vti6_newlink(struct net *src_net, struct net_device *dev,
892 struct nlattr *tb[], struct nlattr *data[])
893{
894 struct net *net = dev_net(dev);
895 struct ip6_tnl *nt;
896
897 nt = netdev_priv(dev);
898 vti6_netlink_parms(data, &nt->parms);
899
900 nt->parms.proto = IPPROTO_IPV6;
901
902 if (vti6_locate(net, &nt->parms, 0))
903 return -EEXIST;
904
905 return vti6_tnl_create2(dev);
906}
907
20ea60ca 908static void vti6_dellink(struct net_device *dev, struct list_head *head)
909{
910 struct net *net = dev_net(dev);
911 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
912
913 if (dev != ip6n->fb_tnl_dev)
914 unregister_netdevice_queue(dev, head);
915}
916
ed1efb2a
SK		 917static int vti6_changelink(struct net_device *dev, struct nlattr *tb[],
918 struct nlattr *data[])
919{
920 struct ip6_tnl *t;
921 struct __ip6_tnl_parm p;
922 struct net *net = dev_net(dev);
923 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
924
925 if (dev == ip6n->fb_tnl_dev)
926 return -EINVAL;
927
928 vti6_netlink_parms(data, &p);
929
930 t = vti6_locate(net, &p, 0);
931
932 if (t) {
933 if (t->dev != dev)
934 return -EEXIST;
935 } else
936 t = netdev_priv(dev);
937
938 return vti6_update(t, &p);
939}
940
941static size_t vti6_get_size(const struct net_device *dev)
942{
943 return
944 /* IFLA_VTI_LINK */
945 nla_total_size(4) +
946 /* IFLA_VTI_LOCAL */
947 nla_total_size(sizeof(struct in6_addr)) +
948 /* IFLA_VTI_REMOTE */
949 nla_total_size(sizeof(struct in6_addr)) +
950 /* IFLA_VTI_IKEY */
951 nla_total_size(4) +
952 /* IFLA_VTI_OKEY */
953 nla_total_size(4) +
954 0;
955}
956
957static int vti6_fill_info(struct sk_buff *skb, const struct net_device *dev)
958{
959 struct ip6_tnl *tunnel = netdev_priv(dev);
960 struct __ip6_tnl_parm *parm = &tunnel->parms;
961
962 if (nla_put_u32(skb, IFLA_VTI_LINK, parm->link) ||
963 nla_put(skb, IFLA_VTI_LOCAL, sizeof(struct in6_addr),
964 &parm->laddr) ||
965 nla_put(skb, IFLA_VTI_REMOTE, sizeof(struct in6_addr),
966 &parm->raddr) ||
967 nla_put_be32(skb, IFLA_VTI_IKEY, parm->i_key) ||
968 nla_put_be32(skb, IFLA_VTI_OKEY, parm->o_key))
969 goto nla_put_failure;
970 return 0;
971
972nla_put_failure:
973 return -EMSGSIZE;
974}
975
976static const struct nla_policy vti6_policy[IFLA_VTI_MAX + 1] = {
977 [IFLA_VTI_LINK] = { .type = NLA_U32 },
978 [IFLA_VTI_LOCAL] = { .len = sizeof(struct in6_addr) },
979 [IFLA_VTI_REMOTE] = { .len = sizeof(struct in6_addr) },
980 [IFLA_VTI_IKEY] = { .type = NLA_U32 },
981 [IFLA_VTI_OKEY] = { .type = NLA_U32 },
982};
983
984static struct rtnl_link_ops vti6_link_ops __read_mostly = {
985 .kind = "vti6",
986 .maxtype = IFLA_VTI_MAX,
987 .policy = vti6_policy,
988 .priv_size = sizeof(struct ip6_tnl),
989 .setup = vti6_dev_setup,
990 .validate = vti6_validate,
991 .newlink = vti6_newlink,
20ea60ca 992 .dellink = vti6_dellink,
ed1efb2a
SK		 993 .changelink = vti6_changelink,
994 .get_size = vti6_get_size,
995 .fill_info = vti6_fill_info,
996};
997
ed1efb2a
SK		 998static void __net_exit vti6_destroy_tunnels(struct vti6_net *ip6n)
999{
1000 int h;
1001 struct ip6_tnl *t;
1002 LIST_HEAD(list);
1003
1004 for (h = 0; h < HASH_SIZE; h++) {
1005 t = rtnl_dereference(ip6n->tnls_r_l[h]);
1006 while (t != NULL) {
1007 unregister_netdevice_queue(t->dev, &list);
1008 t = rtnl_dereference(t->next);
1009 }
1010 }
1011
1012 t = rtnl_dereference(ip6n->tnls_wc[0]);
1013 unregister_netdevice_queue(t->dev, &list);
1014 unregister_netdevice_many(&list);
1015}
1016
1017static int __net_init vti6_init_net(struct net *net)
1018{
1019 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1020 struct ip6_tnl *t = NULL;
1021 int err;
1022
1023 ip6n->tnls[0] = ip6n->tnls_wc;
1024 ip6n->tnls[1] = ip6n->tnls_r_l;
1025
1026 err = -ENOMEM;
1027 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6_vti0",
c835a677 1028 NET_NAME_UNKNOWN, vti6_dev_setup);
ed1efb2a
SK		 1029
1030 if (!ip6n->fb_tnl_dev)
1031 goto err_alloc_dev;
1032 dev_net_set(ip6n->fb_tnl_dev, net);
20ea60ca 1033 ip6n->fb_tnl_dev->rtnl_link_ops = &vti6_link_ops;
ed1efb2a
SK		 1034
1035 err = vti6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1036 if (err < 0)
1037 goto err_register;
1038
1039 err = register_netdev(ip6n->fb_tnl_dev);
1040 if (err < 0)
1041 goto err_register;
1042
1043 t = netdev_priv(ip6n->fb_tnl_dev);
1044
1045 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
1046 return 0;
1047
1048err_register:
1049 vti6_dev_free(ip6n->fb_tnl_dev);
1050err_alloc_dev:
1051 return err;
1052}
1053
1054static void __net_exit vti6_exit_net(struct net *net)
1055{
1056 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1057
1058 rtnl_lock();
1059 vti6_destroy_tunnels(ip6n);
1060 rtnl_unlock();
1061}
1062
1063static struct pernet_operations vti6_net_ops = {
1064 .init = vti6_init_net,
1065 .exit = vti6_exit_net,
1066 .id = &vti6_net_id,
1067 .size = sizeof(struct vti6_net),
1068};
1069
fa9ad96d
SK		 1070static struct xfrm6_protocol vti_esp6_protocol __read_mostly = {
1071 .handler = vti6_rcv,
1072 .cb_handler = vti6_rcv_cb,
1073 .err_handler = vti6_err,
1074 .priority = 100,
1075};
1076
1077static struct xfrm6_protocol vti_ah6_protocol __read_mostly = {
1078 .handler = vti6_rcv,
1079 .cb_handler = vti6_rcv_cb,
1080 .err_handler = vti6_err,
1081 .priority = 100,
1082};
1083
1084static struct xfrm6_protocol vti_ipcomp6_protocol __read_mostly = {
1085 .handler = vti6_rcv,
1086 .cb_handler = vti6_rcv_cb,
1087 .err_handler = vti6_err,
1088 .priority = 100,
1089};
1090
ed1efb2a
SK		 1091/**
1092 * vti6_tunnel_init - register protocol and reserve needed resources
1093 *
1094 * Return: 0 on success
1095 **/
1096static int __init vti6_tunnel_init(void)
1097{
e59d82fd
MK		 1098 const char *msg;
1099 int err;
ed1efb2a 1100
e59d82fd 1101 msg = "tunnel device";
ed1efb2a
SK		 1102 err = register_pernet_device(&vti6_net_ops);
1103 if (err < 0)
e59d82fd 1104 goto pernet_dev_failed;
ed1efb2a 1105
e59d82fd 1106 msg = "tunnel protocols";
fa9ad96d 1107 err = xfrm6_protocol_register(&vti_esp6_protocol, IPPROTO_ESP);
e59d82fd
MK		 1108 if (err < 0)
1109 goto xfrm_proto_esp_failed;
fa9ad96d 1110 err = xfrm6_protocol_register(&vti_ah6_protocol, IPPROTO_AH);
e59d82fd
MK		 1111 if (err < 0)
1112 goto xfrm_proto_ah_failed;
fa9ad96d 1113 err = xfrm6_protocol_register(&vti_ipcomp6_protocol, IPPROTO_COMP);
e59d82fd
MK		 1114 if (err < 0)
1115 goto xfrm_proto_comp_failed;
fa9ad96d 1116
e59d82fd 1117 msg = "netlink interface";
ed1efb2a
SK		 1118 err = rtnl_link_register(&vti6_link_ops);
1119 if (err < 0)
1120 goto rtnl_link_failed;
1121
1122 return 0;
1123
1124rtnl_link_failed:
fa9ad96d 1125 xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
e59d82fd 1126xfrm_proto_comp_failed:
fa9ad96d 1127 xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
e59d82fd 1128xfrm_proto_ah_failed:
fa9ad96d 1129 xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
e59d82fd 1130xfrm_proto_esp_failed:
ed1efb2a 1131 unregister_pernet_device(&vti6_net_ops);
e59d82fd
MK		 1132pernet_dev_failed:
1133 pr_err("vti6 init: failed to register %s\n", msg);
ed1efb2a
SK		 1134 return err;
1135}
1136
1137/**
1138 * vti6_tunnel_cleanup - free resources and unregister protocol
1139 **/
1140static void __exit vti6_tunnel_cleanup(void)
1141{
1142 rtnl_link_unregister(&vti6_link_ops);
e59d82fd
MK		 1143 xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1144 xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1145 xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
ed1efb2a
SK		 1146 unregister_pernet_device(&vti6_net_ops);
1147}
1148
1149module_init(vti6_tunnel_init);
1150module_exit(vti6_tunnel_cleanup);
1151MODULE_LICENSE("GPL");
1152MODULE_ALIAS_RTNL_LINK("vti6");
1153MODULE_ALIAS_NETDEV("ip6_vti0");
1154MODULE_AUTHOR("Steffen Klassert");
1155MODULE_DESCRIPTION("IPv6 virtual tunnel interface");
Linux kernel - Deliverables
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