projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
tunnels: advertise link netns via netlink
[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);
fbe68ee8 98 struct in6_addr any;
ed1efb2a
SK		 99
100 for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
101 if (ipv6_addr_equal(local, &t->parms.laddr) &&
102 ipv6_addr_equal(remote, &t->parms.raddr) &&
103 (t->dev->flags & IFF_UP))
104 return t;
105 }
fbe68ee8
SK		 106
107 memset(&any, 0, sizeof(any));
108 hash = HASH(&any, local);
109 for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
110 if (ipv6_addr_equal(local, &t->parms.laddr) &&
111 (t->dev->flags & IFF_UP))
112 return t;
113 }
114
115 hash = HASH(remote, &any);
116 for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
117 if (ipv6_addr_equal(remote, &t->parms.raddr) &&
118 (t->dev->flags & IFF_UP))
119 return t;
120 }
121
ed1efb2a
SK		 122 t = rcu_dereference(ip6n->tnls_wc[0]);
123 if (t && (t->dev->flags & IFF_UP))
124 return t;
125
126 return NULL;
127}
128
129/**
130 * vti6_tnl_bucket - get head of list matching given tunnel parameters
131 * @p: parameters containing tunnel end-points
132 *
133 * Description:
134 * vti6_tnl_bucket() returns the head of the list matching the
135 * &struct in6_addr entries laddr and raddr in @p.
136 *
137 * Return: head of IPv6 tunnel list
138 **/
139static struct ip6_tnl __rcu **
140vti6_tnl_bucket(struct vti6_net *ip6n, const struct __ip6_tnl_parm *p)
141{
142 const struct in6_addr *remote = &p->raddr;
143 const struct in6_addr *local = &p->laddr;
144 unsigned int h = 0;
145 int prio = 0;
146
147 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
148 prio = 1;
149 h = HASH(remote, local);
150 }
151 return &ip6n->tnls[prio][h];
152}
153
154static void
155vti6_tnl_link(struct vti6_net *ip6n, struct ip6_tnl *t)
156{
157 struct ip6_tnl __rcu **tp = vti6_tnl_bucket(ip6n, &t->parms);
158
159 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
160 rcu_assign_pointer(*tp, t);
161}
162
163static void
164vti6_tnl_unlink(struct vti6_net *ip6n, struct ip6_tnl *t)
165{
166 struct ip6_tnl __rcu **tp;
167 struct ip6_tnl *iter;
168
169 for (tp = vti6_tnl_bucket(ip6n, &t->parms);
170 (iter = rtnl_dereference(*tp)) != NULL;
171 tp = &iter->next) {
172 if (t == iter) {
173 rcu_assign_pointer(*tp, t->next);
174 break;
175 }
176 }
177}
178
179static void vti6_dev_free(struct net_device *dev)
180{
181 free_percpu(dev->tstats);
182 free_netdev(dev);
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
ed1efb2a
SK		 192 err = register_netdevice(dev);
193 if (err < 0)
194 goto out;
195
196 strcpy(t->parms.name, dev->name);
197 dev->rtnl_link_ops = &vti6_link_ops;
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 strlcpy(name, p->name, IFNAMSIZ);
217 else
218 sprintf(name, "ip6_vti%%d");
219
c835a677 220 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, vti6_dev_setup);
ed1efb2a
SK		 221 if (dev == NULL)
222 goto failed;
223
224 dev_net_set(dev, net);
225
226 t = netdev_priv(dev);
227 t->parms = *p;
228 t->net = dev_net(dev);
229
230 err = vti6_tnl_create2(dev);
231 if (err < 0)
232 goto failed_free;
233
234 return t;
235
236failed_free:
237 vti6_dev_free(dev);
238failed:
239 return NULL;
240}
241
242/**
243 * vti6_locate - find or create tunnel matching given parameters
244 * @net: network namespace
245 * @p: tunnel parameters
246 * @create: != 0 if allowed to create new tunnel if no match found
247 *
248 * Description:
249 * vti6_locate() first tries to locate an existing tunnel
250 * based on @parms. If this is unsuccessful, but @create is set a new
251 * tunnel device is created and registered for use.
252 *
253 * Return:
254 * matching tunnel or NULL
255 **/
256static struct ip6_tnl *vti6_locate(struct net *net, struct __ip6_tnl_parm *p,
257 int create)
258{
259 const struct in6_addr *remote = &p->raddr;
260 const struct in6_addr *local = &p->laddr;
261 struct ip6_tnl __rcu **tp;
262 struct ip6_tnl *t;
263 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
264
265 for (tp = vti6_tnl_bucket(ip6n, p);
266 (t = rtnl_dereference(*tp)) != NULL;
267 tp = &t->next) {
268 if (ipv6_addr_equal(local, &t->parms.laddr) &&
d814b847
SK		 269 ipv6_addr_equal(remote, &t->parms.raddr)) {
270 if (create)
271 return NULL;
272
ed1efb2a 273 return t;
d814b847 274 }
ed1efb2a
SK		 275 }
276 if (!create)
277 return NULL;
278 return vti6_tnl_create(net, p);
279}
280
281/**
282 * vti6_dev_uninit - tunnel device uninitializer
283 * @dev: the device to be destroyed
284 *
285 * Description:
286 * vti6_dev_uninit() removes tunnel from its list
287 **/
288static void vti6_dev_uninit(struct net_device *dev)
289{
290 struct ip6_tnl *t = netdev_priv(dev);
291 struct net *net = dev_net(dev);
292 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
293
294 if (dev == ip6n->fb_tnl_dev)
295 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
296 else
297 vti6_tnl_unlink(ip6n, t);
ed1efb2a
SK		 298 dev_put(dev);
299}
300
301static int vti6_rcv(struct sk_buff *skb)
302{
303 struct ip6_tnl *t;
304 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
305
306 rcu_read_lock();
e5d08d71
IM		 307 t = vti6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr);
308 if (t != NULL) {
ed1efb2a
SK		 309 if (t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) {
310 rcu_read_unlock();
311 goto discard;
312 }
313
314 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
315 rcu_read_unlock();
316 return 0;
317 }
318
319 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) {
320 t->dev->stats.rx_dropped++;
321 rcu_read_unlock();
322 goto discard;
323 }
324
fa9ad96d
SK		 325 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = t;
326 skb->mark = be32_to_cpu(t->parms.i_key);
ed1efb2a
SK		 327
328 rcu_read_unlock();
fa9ad96d
SK		 329
330 return xfrm6_rcv(skb);
ed1efb2a
SK		 331 }
332 rcu_read_unlock();
fa9ad96d 333 return -EINVAL;
ed1efb2a
SK		 334discard:
335 kfree_skb(skb);
336 return 0;
337}
338
fa9ad96d
SK		 339static int vti6_rcv_cb(struct sk_buff *skb, int err)
340{
341 unsigned short family;
342 struct net_device *dev;
343 struct pcpu_sw_netstats *tstats;
344 struct xfrm_state *x;
345 struct ip6_tnl *t = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6;
346
347 if (!t)
348 return 1;
349
350 dev = t->dev;
351
352 if (err) {
353 dev->stats.rx_errors++;
354 dev->stats.rx_dropped++;
355
356 return 0;
357 }
358
359 x = xfrm_input_state(skb);
360 family = x->inner_mode->afinfo->family;
361
362 if (!xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family))
363 return -EPERM;
364
365 skb_scrub_packet(skb, !net_eq(t->net, dev_net(skb->dev)));
366 skb->dev = dev;
367
368 tstats = this_cpu_ptr(dev->tstats);
369 u64_stats_update_begin(&tstats->syncp);
370 tstats->rx_packets++;
371 tstats->rx_bytes += skb->len;
372 u64_stats_update_end(&tstats->syncp);
373
374 return 0;
375}
376
ed1efb2a
SK		 377/**
378 * vti6_addr_conflict - compare packet addresses to tunnel's own
379 * @t: the outgoing tunnel device
380 * @hdr: IPv6 header from the incoming packet
381 *
382 * Description:
383 * Avoid trivial tunneling loop by checking that tunnel exit-point
384 * doesn't match source of incoming packet.
385 *
386 * Return:
387 * 1 if conflict,
388 * 0 else
389 **/
390static inline bool
391vti6_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
392{
393 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
394}
395
26be8e2d
SK		 396static bool vti6_state_check(const struct xfrm_state *x,
397 const struct in6_addr *dst,
398 const struct in6_addr *src)
399{
400 xfrm_address_t *daddr = (xfrm_address_t *)dst;
401 xfrm_address_t *saddr = (xfrm_address_t *)src;
402
403 /* if there is no transform then this tunnel is not functional.
404 * Or if the xfrm is not mode tunnel.
405 */
406 if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
407 x->props.family != AF_INET6)
408 return false;
409
410 if (ipv6_addr_any(dst))
411 return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET6);
412
413 if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET6))
414 return false;
415
416 return true;
417}
418
ed1efb2a
SK		 419/**
420 * vti6_xmit - send a packet
421 * @skb: the outgoing socket buffer
422 * @dev: the outgoing tunnel device
22e1b23d 423 * @fl: the flow informations for the xfrm_lookup
ed1efb2a 424 **/
22e1b23d
SK		 425static int
426vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
ed1efb2a 427{
ed1efb2a
SK		 428 struct ip6_tnl *t = netdev_priv(dev);
429 struct net_device_stats *stats = &t->dev->stats;
7c852581 430 struct dst_entry *dst = skb_dst(skb);
ed1efb2a 431 struct net_device *tdev;
d5005140 432 struct xfrm_state *x;
ed1efb2a
SK		 433 int err = -1;
434
7c852581
SK		 435 if (!dst)
436 goto tx_err_link_failure;
ed1efb2a 437
7c852581 438 dst_hold(dst);
22e1b23d 439 dst = xfrm_lookup(t->net, dst, fl, NULL, 0);
7c852581
SK		 440 if (IS_ERR(dst)) {
441 err = PTR_ERR(dst);
442 dst = NULL;
443 goto tx_err_link_failure;
ed1efb2a
SK		 444 }
445
d5005140
SK		 446 x = dst->xfrm;
447 if (!vti6_state_check(x, &t->parms.raddr, &t->parms.laddr))
448 goto tx_err_link_failure;
449
450 if (!ip6_tnl_xmit_ctl(t, (const struct in6_addr *)&x->props.saddr,
451 (const struct in6_addr *)&x->id.daddr))
ed1efb2a
SK		 452 goto tx_err_link_failure;
453
454 tdev = dst->dev;
455
456 if (tdev == dev) {
457 stats->collisions++;
458 net_warn_ratelimited("%s: Local routing loop detected!\n",
459 t->parms.name);
460 goto tx_err_dst_release;
461 }
462
7c852581
SK		 463 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
464 skb_dst_set(skb, dst);
465 skb->dev = skb_dst(skb)->dev;
ed1efb2a 466
22e1b23d
SK		 467 err = dst_output(skb);
468 if (net_xmit_eval(err) == 0) {
469 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
470
471 u64_stats_update_begin(&tstats->syncp);
472 tstats->tx_bytes += skb->len;
473 tstats->tx_packets++;
474 u64_stats_update_end(&tstats->syncp);
475 } else {
476 stats->tx_errors++;
477 stats->tx_aborted_errors++;
478 }
ed1efb2a
SK		 479
480 return 0;
481tx_err_link_failure:
482 stats->tx_carrier_errors++;
483 dst_link_failure(skb);
484tx_err_dst_release:
7c852581 485 dst_release(dst);
ed1efb2a
SK		 486 return err;
487}
488
489static netdev_tx_t
490vti6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
491{
492 struct ip6_tnl *t = netdev_priv(dev);
493 struct net_device_stats *stats = &t->dev->stats;
22e1b23d
SK		 494 struct ipv6hdr *ipv6h;
495 struct flowi fl;
ed1efb2a
SK		 496 int ret;
497
22e1b23d
SK		 498 memset(&fl, 0, sizeof(fl));
499 skb->mark = be32_to_cpu(t->parms.o_key);
500
ed1efb2a
SK		 501 switch (skb->protocol) {
502 case htons(ETH_P_IPV6):
22e1b23d
SK		 503 ipv6h = ipv6_hdr(skb);
504
505 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
d5005140 506 vti6_addr_conflict(t, ipv6h))
22e1b23d
SK		 507 goto tx_err;
508
509 xfrm_decode_session(skb, &fl, AF_INET6);
510 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
511 break;
512 case htons(ETH_P_IP):
513 xfrm_decode_session(skb, &fl, AF_INET);
514 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
ed1efb2a
SK		 515 break;
516 default:
517 goto tx_err;
518 }
519
22e1b23d 520 ret = vti6_xmit(skb, dev, &fl);
ed1efb2a
SK		 521 if (ret < 0)
522 goto tx_err;
523
524 return NETDEV_TX_OK;
525
526tx_err:
527 stats->tx_errors++;
528 stats->tx_dropped++;
529 kfree_skb(skb);
530 return NETDEV_TX_OK;
531}
532
fa9ad96d
SK		 533static int vti6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
534 u8 type, u8 code, int offset, __be32 info)
535{
536 __be32 spi;
6d004d6c 537 __u32 mark;
fa9ad96d
SK		 538 struct xfrm_state *x;
539 struct ip6_tnl *t;
540 struct ip_esp_hdr *esph;
541 struct ip_auth_hdr *ah;
542 struct ip_comp_hdr *ipch;
543 struct net *net = dev_net(skb->dev);
544 const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
545 int protocol = iph->nexthdr;
546
547 t = vti6_tnl_lookup(dev_net(skb->dev), &iph->daddr, &iph->saddr);
548 if (!t)
549 return -1;
550
6d004d6c
SK		 551 mark = be32_to_cpu(t->parms.o_key);
552
fa9ad96d
SK		 553 switch (protocol) {
554 case IPPROTO_ESP:
555 esph = (struct ip_esp_hdr *)(skb->data + offset);
556 spi = esph->spi;
557 break;
558 case IPPROTO_AH:
559 ah = (struct ip_auth_hdr *)(skb->data + offset);
560 spi = ah->spi;
561 break;
562 case IPPROTO_COMP:
563 ipch = (struct ip_comp_hdr *)(skb->data + offset);
564 spi = htonl(ntohs(ipch->cpi));
565 break;
566 default:
567 return 0;
568 }
569
570 if (type != ICMPV6_PKT_TOOBIG &&
571 type != NDISC_REDIRECT)
572 return 0;
573
6d004d6c 574 x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
fa9ad96d
SK		 575 spi, protocol, AF_INET6);
576 if (!x)
577 return 0;
578
579 if (type == NDISC_REDIRECT)
580 ip6_redirect(skb, net, skb->dev->ifindex, 0);
581 else
582 ip6_update_pmtu(skb, net, info, 0, 0);
583 xfrm_state_put(x);
584
585 return 0;
586}
587
ed1efb2a
SK		 588static void vti6_link_config(struct ip6_tnl *t)
589{
ed1efb2a
SK		 590 struct net_device *dev = t->dev;
591 struct __ip6_tnl_parm *p = &t->parms;
ed1efb2a
SK		 592
593 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
594 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
595
ed1efb2a
SK		 596 p->flags &= ~(IP6_TNL_F_CAP_XMIT | IP6_TNL_F_CAP_RCV |
597 IP6_TNL_F_CAP_PER_PACKET);
598 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
599
600 if (p->flags & IP6_TNL_F_CAP_XMIT && p->flags & IP6_TNL_F_CAP_RCV)
601 dev->flags |= IFF_POINTOPOINT;
602 else
603 dev->flags &= ~IFF_POINTOPOINT;
604
605 dev->iflink = p->link;
ed1efb2a
SK		 606}
607
608/**
609 * vti6_tnl_change - update the tunnel parameters
610 * @t: tunnel to be changed
611 * @p: tunnel configuration parameters
612 *
613 * Description:
614 * vti6_tnl_change() updates the tunnel parameters
615 **/
616static int
617vti6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
618{
619 t->parms.laddr = p->laddr;
620 t->parms.raddr = p->raddr;
621 t->parms.link = p->link;
622 t->parms.i_key = p->i_key;
623 t->parms.o_key = p->o_key;
624 t->parms.proto = p->proto;
625 ip6_tnl_dst_reset(t);
626 vti6_link_config(t);
627 return 0;
628}
629
630static int vti6_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
631{
632 struct net *net = dev_net(t->dev);
633 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
634 int err;
635
636 vti6_tnl_unlink(ip6n, t);
637 synchronize_net();
638 err = vti6_tnl_change(t, p);
639 vti6_tnl_link(ip6n, t);
640 netdev_state_change(t->dev);
641 return err;
642}
643
644static void
645vti6_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm2 *u)
646{
647 p->laddr = u->laddr;
648 p->raddr = u->raddr;
649 p->link = u->link;
650 p->i_key = u->i_key;
651 p->o_key = u->o_key;
652 p->proto = u->proto;
653
654 memcpy(p->name, u->name, sizeof(u->name));
655}
656
657static void
658vti6_parm_to_user(struct ip6_tnl_parm2 *u, const struct __ip6_tnl_parm *p)
659{
660 u->laddr = p->laddr;
661 u->raddr = p->raddr;
662 u->link = p->link;
663 u->i_key = p->i_key;
664 u->o_key = p->o_key;
665 u->proto = p->proto;
666
667 memcpy(u->name, p->name, sizeof(u->name));
668}
669
670/**
671 * vti6_tnl_ioctl - configure vti6 tunnels from userspace
672 * @dev: virtual device associated with tunnel
673 * @ifr: parameters passed from userspace
674 * @cmd: command to be performed
675 *
676 * Description:
677 * vti6_ioctl() is used for managing vti6 tunnels
678 * from userspace.
679 *
680 * The possible commands are the following:
681 * %SIOCGETTUNNEL: get tunnel parameters for device
682 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
683 * %SIOCCHGTUNNEL: change tunnel parameters to those given
684 * %SIOCDELTUNNEL: delete tunnel
685 *
686 * The fallback device "ip6_vti0", created during module
687 * initialization, can be used for creating other tunnel devices.
688 *
689 * Return:
690 * 0 on success,
691 * %-EFAULT if unable to copy data to or from userspace,
692 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
693 * %-EINVAL if passed tunnel parameters are invalid,
694 * %-EEXIST if changing a tunnel's parameters would cause a conflict
695 * %-ENODEV if attempting to change or delete a nonexisting device
696 **/
697static int
698vti6_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
699{
700 int err = 0;
701 struct ip6_tnl_parm2 p;
702 struct __ip6_tnl_parm p1;
703 struct ip6_tnl *t = NULL;
704 struct net *net = dev_net(dev);
705 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
706
707 switch (cmd) {
708 case SIOCGETTUNNEL:
709 if (dev == ip6n->fb_tnl_dev) {
710 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
711 err = -EFAULT;
712 break;
713 }
714 vti6_parm_from_user(&p1, &p);
715 t = vti6_locate(net, &p1, 0);
716 } else {
717 memset(&p, 0, sizeof(p));
718 }
719 if (t == NULL)
720 t = netdev_priv(dev);
721 vti6_parm_to_user(&p, &t->parms);
722 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
723 err = -EFAULT;
724 break;
725 case SIOCADDTUNNEL:
726 case SIOCCHGTUNNEL:
727 err = -EPERM;
728 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
729 break;
730 err = -EFAULT;
731 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
732 break;
733 err = -EINVAL;
734 if (p.proto != IPPROTO_IPV6 && p.proto != 0)
735 break;
736 vti6_parm_from_user(&p1, &p);
737 t = vti6_locate(net, &p1, cmd == SIOCADDTUNNEL);
738 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
739 if (t != NULL) {
740 if (t->dev != dev) {
741 err = -EEXIST;
742 break;
743 }
744 } else
745 t = netdev_priv(dev);
746
747 err = vti6_update(t, &p1);
748 }
749 if (t) {
750 err = 0;
751 vti6_parm_to_user(&p, &t->parms);
752 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
753 err = -EFAULT;
754
755 } else
756 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
757 break;
758 case SIOCDELTUNNEL:
759 err = -EPERM;
760 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
761 break;
762
763 if (dev == ip6n->fb_tnl_dev) {
764 err = -EFAULT;
765 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
766 break;
767 err = -ENOENT;
768 vti6_parm_from_user(&p1, &p);
769 t = vti6_locate(net, &p1, 0);
770 if (t == NULL)
771 break;
772 err = -EPERM;
773 if (t->dev == ip6n->fb_tnl_dev)
774 break;
775 dev = t->dev;
776 }
777 err = 0;
778 unregister_netdevice(dev);
779 break;
780 default:
781 err = -EINVAL;
782 }
783 return err;
784}
785
786/**
787 * vti6_tnl_change_mtu - change mtu manually for tunnel device
788 * @dev: virtual device associated with tunnel
789 * @new_mtu: the new mtu
790 *
791 * Return:
792 * 0 on success,
793 * %-EINVAL if mtu too small
794 **/
795static int vti6_change_mtu(struct net_device *dev, int new_mtu)
796{
797 if (new_mtu < IPV6_MIN_MTU)
798 return -EINVAL;
799
800 dev->mtu = new_mtu;
801 return 0;
802}
803
804static const struct net_device_ops vti6_netdev_ops = {
16a0231b 805 .ndo_init = vti6_dev_init,
ed1efb2a
SK		 806 .ndo_uninit = vti6_dev_uninit,
807 .ndo_start_xmit = vti6_tnl_xmit,
808 .ndo_do_ioctl = vti6_ioctl,
809 .ndo_change_mtu = vti6_change_mtu,
469bdcef 810 .ndo_get_stats64 = ip_tunnel_get_stats64,
ed1efb2a
SK		 811};
812
813/**
814 * vti6_dev_setup - setup virtual tunnel device
815 * @dev: virtual device associated with tunnel
816 *
817 * Description:
818 * Initialize function pointers and device parameters
819 **/
820static void vti6_dev_setup(struct net_device *dev)
821{
ed1efb2a
SK		 822 dev->netdev_ops = &vti6_netdev_ops;
823 dev->destructor = vti6_dev_free;
824
825 dev->type = ARPHRD_TUNNEL6;
826 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr);
827 dev->mtu = ETH_DATA_LEN;
ed1efb2a
SK		 828 dev->flags |= IFF_NOARP;
829 dev->addr_len = sizeof(struct in6_addr);
02875878 830 netif_keep_dst(dev);
ed1efb2a
SK		 831}
832
833/**
834 * vti6_dev_init_gen - general initializer for all tunnel devices
835 * @dev: virtual device associated with tunnel
836 **/
837static inline int vti6_dev_init_gen(struct net_device *dev)
838{
839 struct ip6_tnl *t = netdev_priv(dev);
840
841 t->dev = dev;
842 t->net = dev_net(dev);
1c213bd2 843 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
ed1efb2a
SK		 844 if (!dev->tstats)
845 return -ENOMEM;
846 return 0;
847}
848
849/**
850 * vti6_dev_init - initializer for all non fallback tunnel devices
851 * @dev: virtual device associated with tunnel
852 **/
853static int vti6_dev_init(struct net_device *dev)
854{
855 struct ip6_tnl *t = netdev_priv(dev);
856 int err = vti6_dev_init_gen(dev);
857
858 if (err)
859 return err;
860 vti6_link_config(t);
861 return 0;
862}
863
864/**
865 * vti6_fb_tnl_dev_init - initializer for fallback tunnel device
866 * @dev: fallback device
867 *
868 * Return: 0
869 **/
870static int __net_init vti6_fb_tnl_dev_init(struct net_device *dev)
871{
872 struct ip6_tnl *t = netdev_priv(dev);
873 struct net *net = dev_net(dev);
874 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
ed1efb2a
SK		 875
876 t->parms.proto = IPPROTO_IPV6;
877 dev_hold(dev);
878
ed1efb2a
SK		 879 rcu_assign_pointer(ip6n->tnls_wc[0], t);
880 return 0;
881}
882
883static int vti6_validate(struct nlattr *tb[], struct nlattr *data[])
884{
885 return 0;
886}
887
888static void vti6_netlink_parms(struct nlattr *data[],
889 struct __ip6_tnl_parm *parms)
890{
891 memset(parms, 0, sizeof(*parms));
892
893 if (!data)
894 return;
895
896 if (data[IFLA_VTI_LINK])
897 parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
898
899 if (data[IFLA_VTI_LOCAL])
900 nla_memcpy(&parms->laddr, data[IFLA_VTI_LOCAL],
901 sizeof(struct in6_addr));
902
903 if (data[IFLA_VTI_REMOTE])
904 nla_memcpy(&parms->raddr, data[IFLA_VTI_REMOTE],
905 sizeof(struct in6_addr));
906
907 if (data[IFLA_VTI_IKEY])
908 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
909
910 if (data[IFLA_VTI_OKEY])
911 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
912}
913
914static int vti6_newlink(struct net *src_net, struct net_device *dev,
915 struct nlattr *tb[], struct nlattr *data[])
916{
917 struct net *net = dev_net(dev);
918 struct ip6_tnl *nt;
919
920 nt = netdev_priv(dev);
921 vti6_netlink_parms(data, &nt->parms);
922
923 nt->parms.proto = IPPROTO_IPV6;
924
925 if (vti6_locate(net, &nt->parms, 0))
926 return -EEXIST;
927
928 return vti6_tnl_create2(dev);
929}
930
20ea60ca 931static void vti6_dellink(struct net_device *dev, struct list_head *head)
932{
933 struct net *net = dev_net(dev);
934 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
935
936 if (dev != ip6n->fb_tnl_dev)
937 unregister_netdevice_queue(dev, head);
938}
939
ed1efb2a
SK		 940static int vti6_changelink(struct net_device *dev, struct nlattr *tb[],
941 struct nlattr *data[])
942{
943 struct ip6_tnl *t;
944 struct __ip6_tnl_parm p;
945 struct net *net = dev_net(dev);
946 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
947
948 if (dev == ip6n->fb_tnl_dev)
949 return -EINVAL;
950
951 vti6_netlink_parms(data, &p);
952
953 t = vti6_locate(net, &p, 0);
954
955 if (t) {
956 if (t->dev != dev)
957 return -EEXIST;
958 } else
959 t = netdev_priv(dev);
960
961 return vti6_update(t, &p);
962}
963
964static size_t vti6_get_size(const struct net_device *dev)
965{
966 return
967 /* IFLA_VTI_LINK */
968 nla_total_size(4) +
969 /* IFLA_VTI_LOCAL */
970 nla_total_size(sizeof(struct in6_addr)) +
971 /* IFLA_VTI_REMOTE */
972 nla_total_size(sizeof(struct in6_addr)) +
973 /* IFLA_VTI_IKEY */
974 nla_total_size(4) +
975 /* IFLA_VTI_OKEY */
976 nla_total_size(4) +
977 0;
978}
979
980static int vti6_fill_info(struct sk_buff *skb, const struct net_device *dev)
981{
982 struct ip6_tnl *tunnel = netdev_priv(dev);
983 struct __ip6_tnl_parm *parm = &tunnel->parms;
984
985 if (nla_put_u32(skb, IFLA_VTI_LINK, parm->link) ||
986 nla_put(skb, IFLA_VTI_LOCAL, sizeof(struct in6_addr),
987 &parm->laddr) ||
988 nla_put(skb, IFLA_VTI_REMOTE, sizeof(struct in6_addr),
989 &parm->raddr) ||
990 nla_put_be32(skb, IFLA_VTI_IKEY, parm->i_key) ||
991 nla_put_be32(skb, IFLA_VTI_OKEY, parm->o_key))
992 goto nla_put_failure;
993 return 0;
994
995nla_put_failure:
996 return -EMSGSIZE;
997}
998
999static const struct nla_policy vti6_policy[IFLA_VTI_MAX + 1] = {
1000 [IFLA_VTI_LINK] = { .type = NLA_U32 },
1001 [IFLA_VTI_LOCAL] = { .len = sizeof(struct in6_addr) },
1002 [IFLA_VTI_REMOTE] = { .len = sizeof(struct in6_addr) },
1003 [IFLA_VTI_IKEY] = { .type = NLA_U32 },
1004 [IFLA_VTI_OKEY] = { .type = NLA_U32 },
1005};
1006
1007static struct rtnl_link_ops vti6_link_ops __read_mostly = {
1008 .kind = "vti6",
1009 .maxtype = IFLA_VTI_MAX,
1010 .policy = vti6_policy,
1011 .priv_size = sizeof(struct ip6_tnl),
1012 .setup = vti6_dev_setup,
1013 .validate = vti6_validate,
1014 .newlink = vti6_newlink,
20ea60ca 1015 .dellink = vti6_dellink,
ed1efb2a
SK		 1016 .changelink = vti6_changelink,
1017 .get_size = vti6_get_size,
1018 .fill_info = vti6_fill_info,
1728d4fa 1019 .get_link_net = ip6_tnl_get_link_net,
ed1efb2a
SK		 1020};
1021
ed1efb2a
SK		 1022static void __net_exit vti6_destroy_tunnels(struct vti6_net *ip6n)
1023{
1024 int h;
1025 struct ip6_tnl *t;
1026 LIST_HEAD(list);
1027
1028 for (h = 0; h < HASH_SIZE; h++) {
1029 t = rtnl_dereference(ip6n->tnls_r_l[h]);
1030 while (t != NULL) {
1031 unregister_netdevice_queue(t->dev, &list);
1032 t = rtnl_dereference(t->next);
1033 }
1034 }
1035
1036 t = rtnl_dereference(ip6n->tnls_wc[0]);
1037 unregister_netdevice_queue(t->dev, &list);
1038 unregister_netdevice_many(&list);
1039}
1040
1041static int __net_init vti6_init_net(struct net *net)
1042{
1043 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1044 struct ip6_tnl *t = NULL;
1045 int err;
1046
1047 ip6n->tnls[0] = ip6n->tnls_wc;
1048 ip6n->tnls[1] = ip6n->tnls_r_l;
1049
1050 err = -ENOMEM;
1051 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6_vti0",
c835a677 1052 NET_NAME_UNKNOWN, vti6_dev_setup);
ed1efb2a
SK		 1053
1054 if (!ip6n->fb_tnl_dev)
1055 goto err_alloc_dev;
1056 dev_net_set(ip6n->fb_tnl_dev, net);
20ea60ca 1057 ip6n->fb_tnl_dev->rtnl_link_ops = &vti6_link_ops;
ed1efb2a
SK		 1058
1059 err = vti6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1060 if (err < 0)
1061 goto err_register;
1062
1063 err = register_netdev(ip6n->fb_tnl_dev);
1064 if (err < 0)
1065 goto err_register;
1066
1067 t = netdev_priv(ip6n->fb_tnl_dev);
1068
1069 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
1070 return 0;
1071
1072err_register:
1073 vti6_dev_free(ip6n->fb_tnl_dev);
1074err_alloc_dev:
1075 return err;
1076}
1077
1078static void __net_exit vti6_exit_net(struct net *net)
1079{
1080 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1081
1082 rtnl_lock();
1083 vti6_destroy_tunnels(ip6n);
1084 rtnl_unlock();
1085}
1086
1087static struct pernet_operations vti6_net_ops = {
1088 .init = vti6_init_net,
1089 .exit = vti6_exit_net,
1090 .id = &vti6_net_id,
1091 .size = sizeof(struct vti6_net),
1092};
1093
fa9ad96d
SK		 1094static struct xfrm6_protocol vti_esp6_protocol __read_mostly = {
1095 .handler = vti6_rcv,
1096 .cb_handler = vti6_rcv_cb,
1097 .err_handler = vti6_err,
1098 .priority = 100,
1099};
1100
1101static struct xfrm6_protocol vti_ah6_protocol __read_mostly = {
1102 .handler = vti6_rcv,
1103 .cb_handler = vti6_rcv_cb,
1104 .err_handler = vti6_err,
1105 .priority = 100,
1106};
1107
1108static struct xfrm6_protocol vti_ipcomp6_protocol __read_mostly = {
1109 .handler = vti6_rcv,
1110 .cb_handler = vti6_rcv_cb,
1111 .err_handler = vti6_err,
1112 .priority = 100,
1113};
1114
ed1efb2a
SK		 1115/**
1116 * vti6_tunnel_init - register protocol and reserve needed resources
1117 *
1118 * Return: 0 on success
1119 **/
1120static int __init vti6_tunnel_init(void)
1121{
e59d82fd
MK		 1122 const char *msg;
1123 int err;
ed1efb2a 1124
e59d82fd 1125 msg = "tunnel device";
ed1efb2a
SK		 1126 err = register_pernet_device(&vti6_net_ops);
1127 if (err < 0)
e59d82fd 1128 goto pernet_dev_failed;
ed1efb2a 1129
e59d82fd 1130 msg = "tunnel protocols";
fa9ad96d 1131 err = xfrm6_protocol_register(&vti_esp6_protocol, IPPROTO_ESP);
e59d82fd
MK		 1132 if (err < 0)
1133 goto xfrm_proto_esp_failed;
fa9ad96d 1134 err = xfrm6_protocol_register(&vti_ah6_protocol, IPPROTO_AH);
e59d82fd
MK		 1135 if (err < 0)
1136 goto xfrm_proto_ah_failed;
fa9ad96d 1137 err = xfrm6_protocol_register(&vti_ipcomp6_protocol, IPPROTO_COMP);
e59d82fd
MK		 1138 if (err < 0)
1139 goto xfrm_proto_comp_failed;
fa9ad96d 1140
e59d82fd 1141 msg = "netlink interface";
ed1efb2a
SK		 1142 err = rtnl_link_register(&vti6_link_ops);
1143 if (err < 0)
1144 goto rtnl_link_failed;
1145
1146 return 0;
1147
1148rtnl_link_failed:
fa9ad96d 1149 xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
e59d82fd 1150xfrm_proto_comp_failed:
fa9ad96d 1151 xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
e59d82fd 1152xfrm_proto_ah_failed:
fa9ad96d 1153 xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
e59d82fd 1154xfrm_proto_esp_failed:
ed1efb2a 1155 unregister_pernet_device(&vti6_net_ops);
e59d82fd
MK		 1156pernet_dev_failed:
1157 pr_err("vti6 init: failed to register %s\n", msg);
ed1efb2a
SK		 1158 return err;
1159}
1160
1161/**
1162 * vti6_tunnel_cleanup - free resources and unregister protocol
1163 **/
1164static void __exit vti6_tunnel_cleanup(void)
1165{
1166 rtnl_link_unregister(&vti6_link_ops);
e59d82fd
MK		 1167 xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1168 xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1169 xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
ed1efb2a
SK		 1170 unregister_pernet_device(&vti6_net_ops);
1171}
1172
1173module_init(vti6_tunnel_init);
1174module_exit(vti6_tunnel_cleanup);
1175MODULE_LICENSE("GPL");
1176MODULE_ALIAS_RTNL_LINK("vti6");
1177MODULE_ALIAS_NETDEV("ip6_vti0");
1178MODULE_AUTHOR("Steffen Klassert");
1179MODULE_DESCRIPTION("IPv6 virtual tunnel interface");
Linux kernel - Deliverables
This page took 0.136609 seconds and 5 git commands to generate.