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ARM: dma-api: fix max_pfn off-by-one error in __dma_supported()
[linux/fpc-iii.git] / net / ipv6 / ip6_vti.c
blob524006aa0d78a6e38b46d2d828917b5f8c8d1386
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * IPv6 virtual tunneling interface
4 *
5 * Copyright (C) 2013 secunet Security Networks AG
6 *
7 * Author:
8 * Steffen Klassert <steffen.klassert@secunet.com>
9 *
10 * Based on:
11 * net/ipv6/ip6_tunnel.c
12 */
13
14 #include <linux/module.h>
15 #include <linux/capability.h>
16 #include <linux/errno.h>
17 #include <linux/types.h>
18 #include <linux/sockios.h>
19 #include <linux/icmp.h>
20 #include <linux/if.h>
21 #include <linux/in.h>
22 #include <linux/ip.h>
23 #include <linux/net.h>
24 #include <linux/in6.h>
25 #include <linux/netdevice.h>
26 #include <linux/if_arp.h>
27 #include <linux/icmpv6.h>
28 #include <linux/init.h>
29 #include <linux/route.h>
30 #include <linux/rtnetlink.h>
31 #include <linux/netfilter_ipv6.h>
32 #include <linux/slab.h>
33 #include <linux/hash.h>
34
35 #include <linux/uaccess.h>
36 #include <linux/atomic.h>
37
38 #include <net/icmp.h>
39 #include <net/ip.h>
40 #include <net/ip_tunnels.h>
41 #include <net/ipv6.h>
42 #include <net/ip6_route.h>
43 #include <net/addrconf.h>
44 #include <net/ip6_tunnel.h>
45 #include <net/xfrm.h>
46 #include <net/net_namespace.h>
47 #include <net/netns/generic.h>
48 #include <linux/etherdevice.h>
49
50 #define IP6_VTI_HASH_SIZE_SHIFT 5
51 #define IP6_VTI_HASH_SIZE (1 << IP6_VTI_HASH_SIZE_SHIFT)
52
53 static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
54 {
55 u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
56
57 return hash_32(hash, IP6_VTI_HASH_SIZE_SHIFT);
58 }
59
60 static int vti6_dev_init(struct net_device *dev);
61 static void vti6_dev_setup(struct net_device *dev);
62 static struct rtnl_link_ops vti6_link_ops __read_mostly;
63
64 static unsigned int vti6_net_id __read_mostly;
65 struct vti6_net {
66 /* the vti6 tunnel fallback device */
67 struct net_device *fb_tnl_dev;
68 /* lists for storing tunnels in use */
69 struct ip6_tnl __rcu *tnls_r_l[IP6_VTI_HASH_SIZE];
70 struct ip6_tnl __rcu *tnls_wc[1];
71 struct ip6_tnl __rcu **tnls[2];
72 };
73
74 #define for_each_vti6_tunnel_rcu(start) \
75 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
76
77 /**
78 * vti6_tnl_lookup - fetch tunnel matching the end-point addresses
79 * @net: network namespace
80 * @remote: the address of the tunnel exit-point
81 * @local: the address of the tunnel entry-point
82 *
83 * Return:
84 * tunnel matching given end-points if found,
85 * else fallback tunnel if its device is up,
86 * else %NULL
87 **/
88 static struct ip6_tnl *
89 vti6_tnl_lookup(struct net *net, const struct in6_addr *remote,
90 const struct in6_addr *local)
91 {
92 unsigned int hash = HASH(remote, local);
93 struct ip6_tnl *t;
94 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
95 struct in6_addr any;
96
97 for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
98 if (ipv6_addr_equal(local, &t->parms.laddr) &&
99 ipv6_addr_equal(remote, &t->parms.raddr) &&
100 (t->dev->flags & IFF_UP))
101 return t;
102 }
103
104 memset(&any, 0, sizeof(any));
105 hash = HASH(&any, local);
106 for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
107 if (ipv6_addr_equal(local, &t->parms.laddr) &&
108 (t->dev->flags & IFF_UP))
109 return t;
110 }
111
112 hash = HASH(remote, &any);
113 for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
114 if (ipv6_addr_equal(remote, &t->parms.raddr) &&
115 (t->dev->flags & IFF_UP))
116 return t;
117 }
118
119 t = rcu_dereference(ip6n->tnls_wc[0]);
120 if (t && (t->dev->flags & IFF_UP))
121 return t;
122
123 return NULL;
124 }
125
126 /**
127 * vti6_tnl_bucket - get head of list matching given tunnel parameters
128 * @p: parameters containing tunnel end-points
129 *
130 * Description:
131 * vti6_tnl_bucket() returns the head of the list matching the
132 * &struct in6_addr entries laddr and raddr in @p.
133 *
134 * Return: head of IPv6 tunnel list
135 **/
136 static struct ip6_tnl __rcu **
137 vti6_tnl_bucket(struct vti6_net *ip6n, const struct __ip6_tnl_parm *p)
138 {
139 const struct in6_addr *remote = &p->raddr;
140 const struct in6_addr *local = &p->laddr;
141 unsigned int h = 0;
142 int prio = 0;
143
144 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
145 prio = 1;
146 h = HASH(remote, local);
147 }
148 return &ip6n->tnls[prio][h];
149 }
150
151 static void
152 vti6_tnl_link(struct vti6_net *ip6n, struct ip6_tnl *t)
153 {
154 struct ip6_tnl __rcu **tp = vti6_tnl_bucket(ip6n, &t->parms);
155
156 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
157 rcu_assign_pointer(*tp, t);
158 }
159
160 static void
161 vti6_tnl_unlink(struct vti6_net *ip6n, struct ip6_tnl *t)
162 {
163 struct ip6_tnl __rcu **tp;
164 struct ip6_tnl *iter;
165
166 for (tp = vti6_tnl_bucket(ip6n, &t->parms);
167 (iter = rtnl_dereference(*tp)) != NULL;
168 tp = &iter->next) {
169 if (t == iter) {
170 rcu_assign_pointer(*tp, t->next);
171 break;
172 }
173 }
174 }
175
176 static void vti6_dev_free(struct net_device *dev)
177 {
178 free_percpu(dev->tstats);
179 }
180
181 static int vti6_tnl_create2(struct net_device *dev)
182 {
183 struct ip6_tnl *t = netdev_priv(dev);
184 struct net *net = dev_net(dev);
185 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
186 int err;
187
188 dev->rtnl_link_ops = &vti6_link_ops;
189 err = register_netdevice(dev);
190 if (err < 0)
191 goto out;
192
193 strcpy(t->parms.name, dev->name);
194
195 dev_hold(dev);
196 vti6_tnl_link(ip6n, t);
197
198 return 0;
199
200 out:
201 return err;
202 }
203
204 static struct ip6_tnl *vti6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
205 {
206 struct net_device *dev;
207 struct ip6_tnl *t;
208 char name[IFNAMSIZ];
209 int err;
210
211 if (p->name[0]) {
212 if (!dev_valid_name(p->name))
213 goto failed;
214 strlcpy(name, p->name, IFNAMSIZ);
215 } else {
216 sprintf(name, "ip6_vti%%d");
217 }
218
219 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, vti6_dev_setup);
220 if (!dev)
221 goto failed;
222
223 dev_net_set(dev, net);
224
225 t = netdev_priv(dev);
226 t->parms = *p;
227 t->net = dev_net(dev);
228
229 err = vti6_tnl_create2(dev);
230 if (err < 0)
231 goto failed_free;
232
233 return t;
234
235 failed_free:
236 free_netdev(dev);
237 failed:
238 return NULL;
239 }
240
241 /**
242 * vti6_locate - find or create tunnel matching given parameters
243 * @net: network namespace
244 * @p: tunnel parameters
245 * @create: != 0 if allowed to create new tunnel if no match found
246 *
247 * Description:
248 * vti6_locate() first tries to locate an existing tunnel
249 * based on @parms. If this is unsuccessful, but @create is set a new
250 * tunnel device is created and registered for use.
251 *
252 * Return:
253 * matching tunnel or NULL
254 **/
255 static struct ip6_tnl *vti6_locate(struct net *net, struct __ip6_tnl_parm *p,
256 int create)
257 {
258 const struct in6_addr *remote = &p->raddr;
259 const struct in6_addr *local = &p->laddr;
260 struct ip6_tnl __rcu **tp;
261 struct ip6_tnl *t;
262 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
263
264 for (tp = vti6_tnl_bucket(ip6n, p);
265 (t = rtnl_dereference(*tp)) != NULL;
266 tp = &t->next) {
267 if (ipv6_addr_equal(local, &t->parms.laddr) &&
268 ipv6_addr_equal(remote, &t->parms.raddr)) {
269 if (create)
270 return NULL;
271
272 return t;
273 }
274 }
275 if (!create)
276 return NULL;
277 return vti6_tnl_create(net, p);
278 }
279
280 /**
281 * vti6_dev_uninit - tunnel device uninitializer
282 * @dev: the device to be destroyed
283 *
284 * Description:
285 * vti6_dev_uninit() removes tunnel from its list
286 **/
287 static void vti6_dev_uninit(struct net_device *dev)
288 {
289 struct ip6_tnl *t = netdev_priv(dev);
290 struct vti6_net *ip6n = net_generic(t->net, vti6_net_id);
291
292 if (dev == ip6n->fb_tnl_dev)
293 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
294 else
295 vti6_tnl_unlink(ip6n, t);
296 dev_put(dev);
297 }
298
299 static int vti6_rcv(struct sk_buff *skb)
300 {
301 struct ip6_tnl *t;
302 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
303
304 rcu_read_lock();
305 t = vti6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr);
306 if (t) {
307 if (t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) {
308 rcu_read_unlock();
309 goto discard;
310 }
311
312 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
313 rcu_read_unlock();
314 return 0;
315 }
316
317 ipv6h = ipv6_hdr(skb);
318 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) {
319 t->dev->stats.rx_dropped++;
320 rcu_read_unlock();
321 goto discard;
322 }
323
324 rcu_read_unlock();
325
326 return xfrm6_rcv_tnl(skb, t);
327 }
328 rcu_read_unlock();
329 return -EINVAL;
330 discard:
331 kfree_skb(skb);
332 return 0;
333 }
334
335 static int vti6_rcv_cb(struct sk_buff *skb, int err)
336 {
337 unsigned short family;
338 struct net_device *dev;
339 struct pcpu_sw_netstats *tstats;
340 struct xfrm_state *x;
341 const struct xfrm_mode *inner_mode;
342 struct ip6_tnl *t = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6;
343 u32 orig_mark = skb->mark;
344 int ret;
345
346 if (!t)
347 return 1;
348
349 dev = t->dev;
350
351 if (err) {
352 dev->stats.rx_errors++;
353 dev->stats.rx_dropped++;
354
355 return 0;
356 }
357
358 x = xfrm_input_state(skb);
359
360 inner_mode = &x->inner_mode;
361
362 if (x->sel.family == AF_UNSPEC) {
363 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
364 if (inner_mode == NULL) {
365 XFRM_INC_STATS(dev_net(skb->dev),
366 LINUX_MIB_XFRMINSTATEMODEERROR);
367 return -EINVAL;
368 }
369 }
370
371 family = inner_mode->family;
372
373 skb->mark = be32_to_cpu(t->parms.i_key);
374 ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family);
375 skb->mark = orig_mark;
376
377 if (!ret)
378 return -EPERM;
379
380 skb_scrub_packet(skb, !net_eq(t->net, dev_net(skb->dev)));
381 skb->dev = dev;
382
383 tstats = this_cpu_ptr(dev->tstats);
384 u64_stats_update_begin(&tstats->syncp);
385 tstats->rx_packets++;
386 tstats->rx_bytes += skb->len;
387 u64_stats_update_end(&tstats->syncp);
388
389 return 0;
390 }
391
392 /**
393 * vti6_addr_conflict - compare packet addresses to tunnel's own
394 * @t: the outgoing tunnel device
395 * @hdr: IPv6 header from the incoming packet
396 *
397 * Description:
398 * Avoid trivial tunneling loop by checking that tunnel exit-point
399 * doesn't match source of incoming packet.
400 *
401 * Return:
402 * 1 if conflict,
403 * 0 else
404 **/
405 static inline bool
406 vti6_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
407 {
408 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
409 }
410
411 static bool vti6_state_check(const struct xfrm_state *x,
412 const struct in6_addr *dst,
413 const struct in6_addr *src)
414 {
415 xfrm_address_t *daddr = (xfrm_address_t *)dst;
416 xfrm_address_t *saddr = (xfrm_address_t *)src;
417
418 /* if there is no transform then this tunnel is not functional.
419 * Or if the xfrm is not mode tunnel.
420 */
421 if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
422 x->props.family != AF_INET6)
423 return false;
424
425 if (ipv6_addr_any(dst))
426 return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET6);
427
428 if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET6))
429 return false;
430
431 return true;
432 }
433
434 /**
435 * vti6_xmit - send a packet
436 * @skb: the outgoing socket buffer
437 * @dev: the outgoing tunnel device
438 * @fl: the flow informations for the xfrm_lookup
439 **/
440 static int
441 vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
442 {
443 struct ip6_tnl *t = netdev_priv(dev);
444 struct net_device_stats *stats = &t->dev->stats;
445 struct dst_entry *dst = skb_dst(skb);
446 struct net_device *tdev;
447 struct xfrm_state *x;
448 int pkt_len = skb->len;
449 int err = -1;
450 int mtu;
451
452 if (!dst) {
453 fl->u.ip6.flowi6_oif = dev->ifindex;
454 fl->u.ip6.flowi6_flags |= FLOWI_FLAG_ANYSRC;
455 dst = ip6_route_output(dev_net(dev), NULL, &fl->u.ip6);
456 if (dst->error) {
457 dst_release(dst);
458 dst = NULL;
459 goto tx_err_link_failure;
460 }
461 skb_dst_set(skb, dst);
462 }
463
464 dst_hold(dst);
465 dst = xfrm_lookup(t->net, dst, fl, NULL, 0);
466 if (IS_ERR(dst)) {
467 err = PTR_ERR(dst);
468 dst = NULL;
469 goto tx_err_link_failure;
470 }
471
472 x = dst->xfrm;
473 if (!vti6_state_check(x, &t->parms.raddr, &t->parms.laddr))
474 goto tx_err_link_failure;
475
476 if (!ip6_tnl_xmit_ctl(t, (const struct in6_addr *)&x->props.saddr,
477 (const struct in6_addr *)&x->id.daddr))
478 goto tx_err_link_failure;
479
480 tdev = dst->dev;
481
482 if (tdev == dev) {
483 stats->collisions++;
484 net_warn_ratelimited("%s: Local routing loop detected!\n",
485 t->parms.name);
486 goto tx_err_dst_release;
487 }
488
489 mtu = dst_mtu(dst);
490 if (skb->len > mtu) {
491 skb_dst_update_pmtu_no_confirm(skb, mtu);
492
493 if (skb->protocol == htons(ETH_P_IPV6)) {
494 if (mtu < IPV6_MIN_MTU)
495 mtu = IPV6_MIN_MTU;
496
497 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
498 } else {
499 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
500 htonl(mtu));
501 }
502
503 err = -EMSGSIZE;
504 goto tx_err_dst_release;
505 }
506
507 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
508 skb_dst_set(skb, dst);
509 skb->dev = skb_dst(skb)->dev;
510
511 err = dst_output(t->net, skb->sk, skb);
512 if (net_xmit_eval(err) == 0)
513 err = pkt_len;
514 iptunnel_xmit_stats(dev, err);
515
516 return 0;
517 tx_err_link_failure:
518 stats->tx_carrier_errors++;
519 dst_link_failure(skb);
520 tx_err_dst_release:
521 dst_release(dst);
522 return err;
523 }
524
525 static netdev_tx_t
526 vti6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
527 {
528 struct ip6_tnl *t = netdev_priv(dev);
529 struct net_device_stats *stats = &t->dev->stats;
530 struct flowi fl;
531 int ret;
532
533 if (!pskb_inet_may_pull(skb))
534 goto tx_err;
535
536 memset(&fl, 0, sizeof(fl));
537
538 switch (skb->protocol) {
539 case htons(ETH_P_IPV6):
540 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
541 vti6_addr_conflict(t, ipv6_hdr(skb)))
542 goto tx_err;
543
544 xfrm_decode_session(skb, &fl, AF_INET6);
545 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
546 break;
547 case htons(ETH_P_IP):
548 xfrm_decode_session(skb, &fl, AF_INET);
549 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
550 break;
551 default:
552 goto tx_err;
553 }
554
555 /* override mark with tunnel output key */
556 fl.flowi_mark = be32_to_cpu(t->parms.o_key);
557
558 ret = vti6_xmit(skb, dev, &fl);
559 if (ret < 0)
560 goto tx_err;
561
562 return NETDEV_TX_OK;
563
564 tx_err:
565 stats->tx_errors++;
566 stats->tx_dropped++;
567 kfree_skb(skb);
568 return NETDEV_TX_OK;
569 }
570
571 static int vti6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
572 u8 type, u8 code, int offset, __be32 info)
573 {
574 __be32 spi;
575 __u32 mark;
576 struct xfrm_state *x;
577 struct ip6_tnl *t;
578 struct ip_esp_hdr *esph;
579 struct ip_auth_hdr *ah;
580 struct ip_comp_hdr *ipch;
581 struct net *net = dev_net(skb->dev);
582 const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
583 int protocol = iph->nexthdr;
584
585 t = vti6_tnl_lookup(dev_net(skb->dev), &iph->daddr, &iph->saddr);
586 if (!t)
587 return -1;
588
589 mark = be32_to_cpu(t->parms.o_key);
590
591 switch (protocol) {
592 case IPPROTO_ESP:
593 esph = (struct ip_esp_hdr *)(skb->data + offset);
594 spi = esph->spi;
595 break;
596 case IPPROTO_AH:
597 ah = (struct ip_auth_hdr *)(skb->data + offset);
598 spi = ah->spi;
599 break;
600 case IPPROTO_COMP:
601 ipch = (struct ip_comp_hdr *)(skb->data + offset);
602 spi = htonl(ntohs(ipch->cpi));
603 break;
604 default:
605 return 0;
606 }
607
608 if (type != ICMPV6_PKT_TOOBIG &&
609 type != NDISC_REDIRECT)
610 return 0;
611
612 x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
613 spi, protocol, AF_INET6);
614 if (!x)
615 return 0;
616
617 if (type == NDISC_REDIRECT)
618 ip6_redirect(skb, net, skb->dev->ifindex, 0,
619 sock_net_uid(net, NULL));
620 else
621 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
622 xfrm_state_put(x);
623
624 return 0;
625 }
626
627 static void vti6_link_config(struct ip6_tnl *t, bool keep_mtu)
628 {
629 struct net_device *dev = t->dev;
630 struct __ip6_tnl_parm *p = &t->parms;
631 struct net_device *tdev = NULL;
632 int mtu;
633
634 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
635 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
636
637 p->flags &= ~(IP6_TNL_F_CAP_XMIT | IP6_TNL_F_CAP_RCV |
638 IP6_TNL_F_CAP_PER_PACKET);
639 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
640
641 if (p->flags & IP6_TNL_F_CAP_XMIT && p->flags & IP6_TNL_F_CAP_RCV)
642 dev->flags |= IFF_POINTOPOINT;
643 else
644 dev->flags &= ~IFF_POINTOPOINT;
645
646 if (keep_mtu && dev->mtu) {
647 dev->mtu = clamp(dev->mtu, dev->min_mtu, dev->max_mtu);
648 return;
649 }
650
651 if (p->flags & IP6_TNL_F_CAP_XMIT) {
652 int strict = (ipv6_addr_type(&p->raddr) &
653 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL));
654 struct rt6_info *rt = rt6_lookup(t->net,
655 &p->raddr, &p->laddr,
656 p->link, NULL, strict);
657
658 if (rt)
659 tdev = rt->dst.dev;
660 ip6_rt_put(rt);
661 }
662
663 if (!tdev && p->link)
664 tdev = __dev_get_by_index(t->net, p->link);
665
666 if (tdev)
667 mtu = tdev->mtu - sizeof(struct ipv6hdr);
668 else
669 mtu = ETH_DATA_LEN - LL_MAX_HEADER - sizeof(struct ipv6hdr);
670
671 dev->mtu = max_t(int, mtu, IPV4_MIN_MTU);
672 }
673
674 /**
675 * vti6_tnl_change - update the tunnel parameters
676 * @t: tunnel to be changed
677 * @p: tunnel configuration parameters
678 * @keep_mtu: MTU was set from userspace, don't re-compute it
679 *
680 * Description:
681 * vti6_tnl_change() updates the tunnel parameters
682 **/
683 static int
684 vti6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
685 bool keep_mtu)
686 {
687 t->parms.laddr = p->laddr;
688 t->parms.raddr = p->raddr;
689 t->parms.link = p->link;
690 t->parms.i_key = p->i_key;
691 t->parms.o_key = p->o_key;
692 t->parms.proto = p->proto;
693 t->parms.fwmark = p->fwmark;
694 dst_cache_reset(&t->dst_cache);
695 vti6_link_config(t, keep_mtu);
696 return 0;
697 }
698
699 static int vti6_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p,
700 bool keep_mtu)
701 {
702 struct net *net = dev_net(t->dev);
703 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
704 int err;
705
706 vti6_tnl_unlink(ip6n, t);
707 synchronize_net();
708 err = vti6_tnl_change(t, p, keep_mtu);
709 vti6_tnl_link(ip6n, t);
710 netdev_state_change(t->dev);
711 return err;
712 }
713
714 static void
715 vti6_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm2 *u)
716 {
717 p->laddr = u->laddr;
718 p->raddr = u->raddr;
719 p->link = u->link;
720 p->i_key = u->i_key;
721 p->o_key = u->o_key;
722 p->proto = u->proto;
723
724 memcpy(p->name, u->name, sizeof(u->name));
725 }
726
727 static void
728 vti6_parm_to_user(struct ip6_tnl_parm2 *u, const struct __ip6_tnl_parm *p)
729 {
730 u->laddr = p->laddr;
731 u->raddr = p->raddr;
732 u->link = p->link;
733 u->i_key = p->i_key;
734 u->o_key = p->o_key;
735 if (u->i_key)
736 u->i_flags |= GRE_KEY;
737 if (u->o_key)
738 u->o_flags |= GRE_KEY;
739 u->proto = p->proto;
740
741 memcpy(u->name, p->name, sizeof(u->name));
742 }
743
744 /**
745 * vti6_ioctl - configure vti6 tunnels from userspace
746 * @dev: virtual device associated with tunnel
747 * @ifr: parameters passed from userspace
748 * @cmd: command to be performed
749 *
750 * Description:
751 * vti6_ioctl() is used for managing vti6 tunnels
752 * from userspace.
753 *
754 * The possible commands are the following:
755 * %SIOCGETTUNNEL: get tunnel parameters for device
756 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
757 * %SIOCCHGTUNNEL: change tunnel parameters to those given
758 * %SIOCDELTUNNEL: delete tunnel
759 *
760 * The fallback device "ip6_vti0", created during module
761 * initialization, can be used for creating other tunnel devices.
762 *
763 * Return:
764 * 0 on success,
765 * %-EFAULT if unable to copy data to or from userspace,
766 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
767 * %-EINVAL if passed tunnel parameters are invalid,
768 * %-EEXIST if changing a tunnel's parameters would cause a conflict
769 * %-ENODEV if attempting to change or delete a nonexisting device
770 **/
771 static int
772 vti6_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
773 {
774 int err = 0;
775 struct ip6_tnl_parm2 p;
776 struct __ip6_tnl_parm p1;
777 struct ip6_tnl *t = NULL;
778 struct net *net = dev_net(dev);
779 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
780
781 switch (cmd) {
782 case SIOCGETTUNNEL:
783 if (dev == ip6n->fb_tnl_dev) {
784 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
785 err = -EFAULT;
786 break;
787 }
788 vti6_parm_from_user(&p1, &p);
789 t = vti6_locate(net, &p1, 0);
790 } else {
791 memset(&p, 0, sizeof(p));
792 }
793 if (!t)
794 t = netdev_priv(dev);
795 vti6_parm_to_user(&p, &t->parms);
796 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
797 err = -EFAULT;
798 break;
799 case SIOCADDTUNNEL:
800 case SIOCCHGTUNNEL:
801 err = -EPERM;
802 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
803 break;
804 err = -EFAULT;
805 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
806 break;
807 err = -EINVAL;
808 if (p.proto != IPPROTO_IPV6 && p.proto != 0)
809 break;
810 vti6_parm_from_user(&p1, &p);
811 t = vti6_locate(net, &p1, cmd == SIOCADDTUNNEL);
812 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
813 if (t) {
814 if (t->dev != dev) {
815 err = -EEXIST;
816 break;
817 }
818 } else
819 t = netdev_priv(dev);
820
821 err = vti6_update(t, &p1, false);
822 }
823 if (t) {
824 err = 0;
825 vti6_parm_to_user(&p, &t->parms);
826 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
827 err = -EFAULT;
828
829 } else
830 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
831 break;
832 case SIOCDELTUNNEL:
833 err = -EPERM;
834 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
835 break;
836
837 if (dev == ip6n->fb_tnl_dev) {
838 err = -EFAULT;
839 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
840 break;
841 err = -ENOENT;
842 vti6_parm_from_user(&p1, &p);
843 t = vti6_locate(net, &p1, 0);
844 if (!t)
845 break;
846 err = -EPERM;
847 if (t->dev == ip6n->fb_tnl_dev)
848 break;
849 dev = t->dev;
850 }
851 err = 0;
852 unregister_netdevice(dev);
853 break;
854 default:
855 err = -EINVAL;
856 }
857 return err;
858 }
859
860 static const struct net_device_ops vti6_netdev_ops = {
861 .ndo_init = vti6_dev_init,
862 .ndo_uninit = vti6_dev_uninit,
863 .ndo_start_xmit = vti6_tnl_xmit,
864 .ndo_do_ioctl = vti6_ioctl,
865 .ndo_get_stats64 = ip_tunnel_get_stats64,
866 .ndo_get_iflink = ip6_tnl_get_iflink,
867 };
868
869 /**
870 * vti6_dev_setup - setup virtual tunnel device
871 * @dev: virtual device associated with tunnel
872 *
873 * Description:
874 * Initialize function pointers and device parameters
875 **/
876 static void vti6_dev_setup(struct net_device *dev)
877 {
878 dev->netdev_ops = &vti6_netdev_ops;
879 dev->needs_free_netdev = true;
880 dev->priv_destructor = vti6_dev_free;
881
882 dev->type = ARPHRD_TUNNEL6;
883 dev->min_mtu = IPV4_MIN_MTU;
884 dev->max_mtu = IP_MAX_MTU - sizeof(struct ipv6hdr);
885 dev->flags |= IFF_NOARP;
886 dev->addr_len = sizeof(struct in6_addr);
887 netif_keep_dst(dev);
888 /* This perm addr will be used as interface identifier by IPv6 */
889 dev->addr_assign_type = NET_ADDR_RANDOM;
890 eth_random_addr(dev->perm_addr);
891 }
892
893 /**
894 * vti6_dev_init_gen - general initializer for all tunnel devices
895 * @dev: virtual device associated with tunnel
896 **/
897 static inline int vti6_dev_init_gen(struct net_device *dev)
898 {
899 struct ip6_tnl *t = netdev_priv(dev);
900
901 t->dev = dev;
902 t->net = dev_net(dev);
903 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
904 if (!dev->tstats)
905 return -ENOMEM;
906 return 0;
907 }
908
909 /**
910 * vti6_dev_init - initializer for all non fallback tunnel devices
911 * @dev: virtual device associated with tunnel
912 **/
913 static int vti6_dev_init(struct net_device *dev)
914 {
915 struct ip6_tnl *t = netdev_priv(dev);
916 int err = vti6_dev_init_gen(dev);
917
918 if (err)
919 return err;
920 vti6_link_config(t, true);
921 return 0;
922 }
923
924 /**
925 * vti6_fb_tnl_dev_init - initializer for fallback tunnel device
926 * @dev: fallback device
927 *
928 * Return: 0
929 **/
930 static int __net_init vti6_fb_tnl_dev_init(struct net_device *dev)
931 {
932 struct ip6_tnl *t = netdev_priv(dev);
933 struct net *net = dev_net(dev);
934 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
935
936 t->parms.proto = IPPROTO_IPV6;
937 dev_hold(dev);
938
939 rcu_assign_pointer(ip6n->tnls_wc[0], t);
940 return 0;
941 }
942
943 static int vti6_validate(struct nlattr *tb[], struct nlattr *data[],
944 struct netlink_ext_ack *extack)
945 {
946 return 0;
947 }
948
949 static void vti6_netlink_parms(struct nlattr *data[],
950 struct __ip6_tnl_parm *parms)
951 {
952 memset(parms, 0, sizeof(*parms));
953
954 if (!data)
955 return;
956
957 if (data[IFLA_VTI_LINK])
958 parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
959
960 if (data[IFLA_VTI_LOCAL])
961 parms->laddr = nla_get_in6_addr(data[IFLA_VTI_LOCAL]);
962
963 if (data[IFLA_VTI_REMOTE])
964 parms->raddr = nla_get_in6_addr(data[IFLA_VTI_REMOTE]);
965
966 if (data[IFLA_VTI_IKEY])
967 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
968
969 if (data[IFLA_VTI_OKEY])
970 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
971
972 if (data[IFLA_VTI_FWMARK])
973 parms->fwmark = nla_get_u32(data[IFLA_VTI_FWMARK]);
974 }
975
976 static int vti6_newlink(struct net *src_net, struct net_device *dev,
977 struct nlattr *tb[], struct nlattr *data[],
978 struct netlink_ext_ack *extack)
979 {
980 struct net *net = dev_net(dev);
981 struct ip6_tnl *nt;
982
983 nt = netdev_priv(dev);
984 vti6_netlink_parms(data, &nt->parms);
985
986 nt->parms.proto = IPPROTO_IPV6;
987
988 if (vti6_locate(net, &nt->parms, 0))
989 return -EEXIST;
990
991 return vti6_tnl_create2(dev);
992 }
993
994 static void vti6_dellink(struct net_device *dev, struct list_head *head)
995 {
996 struct net *net = dev_net(dev);
997 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
998
999 if (dev != ip6n->fb_tnl_dev)
1000 unregister_netdevice_queue(dev, head);
1001 }
1002
1003 static int vti6_changelink(struct net_device *dev, struct nlattr *tb[],
1004 struct nlattr *data[],
1005 struct netlink_ext_ack *extack)
1006 {
1007 struct ip6_tnl *t;
1008 struct __ip6_tnl_parm p;
1009 struct net *net = dev_net(dev);
1010 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1011
1012 if (dev == ip6n->fb_tnl_dev)
1013 return -EINVAL;
1014
1015 vti6_netlink_parms(data, &p);
1016
1017 t = vti6_locate(net, &p, 0);
1018
1019 if (t) {
1020 if (t->dev != dev)
1021 return -EEXIST;
1022 } else
1023 t = netdev_priv(dev);
1024
1025 return vti6_update(t, &p, tb && tb[IFLA_MTU]);
1026 }
1027
1028 static size_t vti6_get_size(const struct net_device *dev)
1029 {
1030 return
1031 /* IFLA_VTI_LINK */
1032 nla_total_size(4) +
1033 /* IFLA_VTI_LOCAL */
1034 nla_total_size(sizeof(struct in6_addr)) +
1035 /* IFLA_VTI_REMOTE */
1036 nla_total_size(sizeof(struct in6_addr)) +
1037 /* IFLA_VTI_IKEY */
1038 nla_total_size(4) +
1039 /* IFLA_VTI_OKEY */
1040 nla_total_size(4) +
1041 /* IFLA_VTI_FWMARK */
1042 nla_total_size(4) +
1043 0;
1044 }
1045
1046 static int vti6_fill_info(struct sk_buff *skb, const struct net_device *dev)
1047 {
1048 struct ip6_tnl *tunnel = netdev_priv(dev);
1049 struct __ip6_tnl_parm *parm = &tunnel->parms;
1050
1051 if (nla_put_u32(skb, IFLA_VTI_LINK, parm->link) ||
1052 nla_put_in6_addr(skb, IFLA_VTI_LOCAL, &parm->laddr) ||
1053 nla_put_in6_addr(skb, IFLA_VTI_REMOTE, &parm->raddr) ||
1054 nla_put_be32(skb, IFLA_VTI_IKEY, parm->i_key) ||
1055 nla_put_be32(skb, IFLA_VTI_OKEY, parm->o_key) ||
1056 nla_put_u32(skb, IFLA_VTI_FWMARK, parm->fwmark))
1057 goto nla_put_failure;
1058 return 0;
1059
1060 nla_put_failure:
1061 return -EMSGSIZE;
1062 }
1063
1064 static const struct nla_policy vti6_policy[IFLA_VTI_MAX + 1] = {
1065 [IFLA_VTI_LINK] = { .type = NLA_U32 },
1066 [IFLA_VTI_LOCAL] = { .len = sizeof(struct in6_addr) },
1067 [IFLA_VTI_REMOTE] = { .len = sizeof(struct in6_addr) },
1068 [IFLA_VTI_IKEY] = { .type = NLA_U32 },
1069 [IFLA_VTI_OKEY] = { .type = NLA_U32 },
1070 [IFLA_VTI_FWMARK] = { .type = NLA_U32 },
1071 };
1072
1073 static struct rtnl_link_ops vti6_link_ops __read_mostly = {
1074 .kind = "vti6",
1075 .maxtype = IFLA_VTI_MAX,
1076 .policy = vti6_policy,
1077 .priv_size = sizeof(struct ip6_tnl),
1078 .setup = vti6_dev_setup,
1079 .validate = vti6_validate,
1080 .newlink = vti6_newlink,
1081 .dellink = vti6_dellink,
1082 .changelink = vti6_changelink,
1083 .get_size = vti6_get_size,
1084 .fill_info = vti6_fill_info,
1085 .get_link_net = ip6_tnl_get_link_net,
1086 };
1087
1088 static void __net_exit vti6_destroy_tunnels(struct vti6_net *ip6n,
1089 struct list_head *list)
1090 {
1091 int h;
1092 struct ip6_tnl *t;
1093
1094 for (h = 0; h < IP6_VTI_HASH_SIZE; h++) {
1095 t = rtnl_dereference(ip6n->tnls_r_l[h]);
1096 while (t) {
1097 unregister_netdevice_queue(t->dev, list);
1098 t = rtnl_dereference(t->next);
1099 }
1100 }
1101
1102 t = rtnl_dereference(ip6n->tnls_wc[0]);
1103 if (t)
1104 unregister_netdevice_queue(t->dev, list);
1105 }
1106
1107 static 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 if (!net_has_fallback_tunnels(net))
1117 return 0;
1118 err = -ENOMEM;
1119 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6_vti0",
1120 NET_NAME_UNKNOWN, vti6_dev_setup);
1121
1122 if (!ip6n->fb_tnl_dev)
1123 goto err_alloc_dev;
1124 dev_net_set(ip6n->fb_tnl_dev, net);
1125 ip6n->fb_tnl_dev->rtnl_link_ops = &vti6_link_ops;
1126
1127 err = vti6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1128 if (err < 0)
1129 goto err_register;
1130
1131 err = register_netdev(ip6n->fb_tnl_dev);
1132 if (err < 0)
1133 goto err_register;
1134
1135 t = netdev_priv(ip6n->fb_tnl_dev);
1136
1137 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
1138 return 0;
1139
1140 err_register:
1141 free_netdev(ip6n->fb_tnl_dev);
1142 err_alloc_dev:
1143 return err;
1144 }
1145
1146 static void __net_exit vti6_exit_batch_net(struct list_head *net_list)
1147 {
1148 struct vti6_net *ip6n;
1149 struct net *net;
1150 LIST_HEAD(list);
1151
1152 rtnl_lock();
1153 list_for_each_entry(net, net_list, exit_list) {
1154 ip6n = net_generic(net, vti6_net_id);
1155 vti6_destroy_tunnels(ip6n, &list);
1156 }
1157 unregister_netdevice_many(&list);
1158 rtnl_unlock();
1159 }
1160
1161 static struct pernet_operations vti6_net_ops = {
1162 .init = vti6_init_net,
1163 .exit_batch = vti6_exit_batch_net,
1164 .id = &vti6_net_id,
1165 .size = sizeof(struct vti6_net),
1166 };
1167
1168 static struct xfrm6_protocol vti_esp6_protocol __read_mostly = {
1169 .handler = vti6_rcv,
1170 .cb_handler = vti6_rcv_cb,
1171 .err_handler = vti6_err,
1172 .priority = 100,
1173 };
1174
1175 static struct xfrm6_protocol vti_ah6_protocol __read_mostly = {
1176 .handler = vti6_rcv,
1177 .cb_handler = vti6_rcv_cb,
1178 .err_handler = vti6_err,
1179 .priority = 100,
1180 };
1181
1182 static struct xfrm6_protocol vti_ipcomp6_protocol __read_mostly = {
1183 .handler = vti6_rcv,
1184 .cb_handler = vti6_rcv_cb,
1185 .err_handler = vti6_err,
1186 .priority = 100,
1187 };
1188
1189 /**
1190 * vti6_tunnel_init - register protocol and reserve needed resources
1191 *
1192 * Return: 0 on success
1193 **/
1194 static int __init vti6_tunnel_init(void)
1195 {
1196 const char *msg;
1197 int err;
1198
1199 msg = "tunnel device";
1200 err = register_pernet_device(&vti6_net_ops);
1201 if (err < 0)
1202 goto pernet_dev_failed;
1203
1204 msg = "tunnel protocols";
1205 err = xfrm6_protocol_register(&vti_esp6_protocol, IPPROTO_ESP);
1206 if (err < 0)
1207 goto xfrm_proto_esp_failed;
1208 err = xfrm6_protocol_register(&vti_ah6_protocol, IPPROTO_AH);
1209 if (err < 0)
1210 goto xfrm_proto_ah_failed;
1211 err = xfrm6_protocol_register(&vti_ipcomp6_protocol, IPPROTO_COMP);
1212 if (err < 0)
1213 goto xfrm_proto_comp_failed;
1214
1215 msg = "netlink interface";
1216 err = rtnl_link_register(&vti6_link_ops);
1217 if (err < 0)
1218 goto rtnl_link_failed;
1219
1220 return 0;
1221
1222 rtnl_link_failed:
1223 xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1224 xfrm_proto_comp_failed:
1225 xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1226 xfrm_proto_ah_failed:
1227 xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1228 xfrm_proto_esp_failed:
1229 unregister_pernet_device(&vti6_net_ops);
1230 pernet_dev_failed:
1231 pr_err("vti6 init: failed to register %s\n", msg);
1232 return err;
1233 }
1234
1235 /**
1236 * vti6_tunnel_cleanup - free resources and unregister protocol
1237 **/
1238 static void __exit vti6_tunnel_cleanup(void)
1239 {
1240 rtnl_link_unregister(&vti6_link_ops);
1241 xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1242 xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1243 xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1244 unregister_pernet_device(&vti6_net_ops);
1245 }
1246
1247 module_init(vti6_tunnel_init);
1248 module_exit(vti6_tunnel_cleanup);
1249 MODULE_LICENSE("GPL");
1250 MODULE_ALIAS_RTNL_LINK("vti6");
1251 MODULE_ALIAS_NETDEV("ip6_vti0");
1252 MODULE_AUTHOR("Steffen Klassert");
1253 MODULE_DESCRIPTION("IPv6 virtual tunnel interface");
Linux with added FPC-III support