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io_uring: don't count rqs failed after current one
[linux/fpc-iii.git] / net / ipv6 / ip6_vti.c
blobcc6180e08a4fc2228c0f5208c2a6d598c4b82185
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 goto discard;
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 switch (skb->protocol) {
454 case htons(ETH_P_IP): {
455 struct rtable *rt;
456
457 fl->u.ip4.flowi4_oif = dev->ifindex;
458 fl->u.ip4.flowi4_flags |= FLOWI_FLAG_ANYSRC;
459 rt = __ip_route_output_key(dev_net(dev), &fl->u.ip4);
460 if (IS_ERR(rt))
461 goto tx_err_link_failure;
462 dst = &rt->dst;
463 skb_dst_set(skb, dst);
464 break;
465 }
466 case htons(ETH_P_IPV6):
467 fl->u.ip6.flowi6_oif = dev->ifindex;
468 fl->u.ip6.flowi6_flags |= FLOWI_FLAG_ANYSRC;
469 dst = ip6_route_output(dev_net(dev), NULL, &fl->u.ip6);
470 if (dst->error) {
471 dst_release(dst);
472 dst = NULL;
473 goto tx_err_link_failure;
474 }
475 skb_dst_set(skb, dst);
476 break;
477 default:
478 goto tx_err_link_failure;
479 }
480 }
481
482 dst_hold(dst);
483 dst = xfrm_lookup(t->net, dst, fl, NULL, 0);
484 if (IS_ERR(dst)) {
485 err = PTR_ERR(dst);
486 dst = NULL;
487 goto tx_err_link_failure;
488 }
489
490 x = dst->xfrm;
491 if (!vti6_state_check(x, &t->parms.raddr, &t->parms.laddr))
492 goto tx_err_link_failure;
493
494 if (!ip6_tnl_xmit_ctl(t, (const struct in6_addr *)&x->props.saddr,
495 (const struct in6_addr *)&x->id.daddr))
496 goto tx_err_link_failure;
497
498 tdev = dst->dev;
499
500 if (tdev == dev) {
501 stats->collisions++;
502 net_warn_ratelimited("%s: Local routing loop detected!\n",
503 t->parms.name);
504 goto tx_err_dst_release;
505 }
506
507 mtu = dst_mtu(dst);
508 if (skb->len > mtu) {
509 skb_dst_update_pmtu_no_confirm(skb, mtu);
510
511 if (skb->protocol == htons(ETH_P_IPV6)) {
512 if (mtu < IPV6_MIN_MTU)
513 mtu = IPV6_MIN_MTU;
514
515 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
516 } else {
517 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
518 htonl(mtu));
519 }
520
521 err = -EMSGSIZE;
522 goto tx_err_dst_release;
523 }
524
525 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
526 skb_dst_set(skb, dst);
527 skb->dev = skb_dst(skb)->dev;
528
529 err = dst_output(t->net, skb->sk, skb);
530 if (net_xmit_eval(err) == 0)
531 err = pkt_len;
532 iptunnel_xmit_stats(dev, err);
533
534 return 0;
535 tx_err_link_failure:
536 stats->tx_carrier_errors++;
537 dst_link_failure(skb);
538 tx_err_dst_release:
539 dst_release(dst);
540 return err;
541 }
542
543 static netdev_tx_t
544 vti6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
545 {
546 struct ip6_tnl *t = netdev_priv(dev);
547 struct net_device_stats *stats = &t->dev->stats;
548 struct flowi fl;
549 int ret;
550
551 if (!pskb_inet_may_pull(skb))
552 goto tx_err;
553
554 memset(&fl, 0, sizeof(fl));
555
556 switch (skb->protocol) {
557 case htons(ETH_P_IPV6):
558 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
559 vti6_addr_conflict(t, ipv6_hdr(skb)))
560 goto tx_err;
561
562 xfrm_decode_session(skb, &fl, AF_INET6);
563 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
564 break;
565 case htons(ETH_P_IP):
566 xfrm_decode_session(skb, &fl, AF_INET);
567 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
568 break;
569 default:
570 goto tx_err;
571 }
572
573 /* override mark with tunnel output key */
574 fl.flowi_mark = be32_to_cpu(t->parms.o_key);
575
576 ret = vti6_xmit(skb, dev, &fl);
577 if (ret < 0)
578 goto tx_err;
579
580 return NETDEV_TX_OK;
581
582 tx_err:
583 stats->tx_errors++;
584 stats->tx_dropped++;
585 kfree_skb(skb);
586 return NETDEV_TX_OK;
587 }
588
589 static int vti6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
590 u8 type, u8 code, int offset, __be32 info)
591 {
592 __be32 spi;
593 __u32 mark;
594 struct xfrm_state *x;
595 struct ip6_tnl *t;
596 struct ip_esp_hdr *esph;
597 struct ip_auth_hdr *ah;
598 struct ip_comp_hdr *ipch;
599 struct net *net = dev_net(skb->dev);
600 const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
601 int protocol = iph->nexthdr;
602
603 t = vti6_tnl_lookup(dev_net(skb->dev), &iph->daddr, &iph->saddr);
604 if (!t)
605 return -1;
606
607 mark = be32_to_cpu(t->parms.o_key);
608
609 switch (protocol) {
610 case IPPROTO_ESP:
611 esph = (struct ip_esp_hdr *)(skb->data + offset);
612 spi = esph->spi;
613 break;
614 case IPPROTO_AH:
615 ah = (struct ip_auth_hdr *)(skb->data + offset);
616 spi = ah->spi;
617 break;
618 case IPPROTO_COMP:
619 ipch = (struct ip_comp_hdr *)(skb->data + offset);
620 spi = htonl(ntohs(ipch->cpi));
621 break;
622 default:
623 return 0;
624 }
625
626 if (type != ICMPV6_PKT_TOOBIG &&
627 type != NDISC_REDIRECT)
628 return 0;
629
630 x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
631 spi, protocol, AF_INET6);
632 if (!x)
633 return 0;
634
635 if (type == NDISC_REDIRECT)
636 ip6_redirect(skb, net, skb->dev->ifindex, 0,
637 sock_net_uid(net, NULL));
638 else
639 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
640 xfrm_state_put(x);
641
642 return 0;
643 }
644
645 static void vti6_link_config(struct ip6_tnl *t, bool keep_mtu)
646 {
647 struct net_device *dev = t->dev;
648 struct __ip6_tnl_parm *p = &t->parms;
649 struct net_device *tdev = NULL;
650 int mtu;
651
652 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
653 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
654
655 p->flags &= ~(IP6_TNL_F_CAP_XMIT | IP6_TNL_F_CAP_RCV |
656 IP6_TNL_F_CAP_PER_PACKET);
657 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
658
659 if (p->flags & IP6_TNL_F_CAP_XMIT && p->flags & IP6_TNL_F_CAP_RCV)
660 dev->flags |= IFF_POINTOPOINT;
661 else
662 dev->flags &= ~IFF_POINTOPOINT;
663
664 if (keep_mtu && dev->mtu) {
665 dev->mtu = clamp(dev->mtu, dev->min_mtu, dev->max_mtu);
666 return;
667 }
668
669 if (p->flags & IP6_TNL_F_CAP_XMIT) {
670 int strict = (ipv6_addr_type(&p->raddr) &
671 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL));
672 struct rt6_info *rt = rt6_lookup(t->net,
673 &p->raddr, &p->laddr,
674 p->link, NULL, strict);
675
676 if (rt)
677 tdev = rt->dst.dev;
678 ip6_rt_put(rt);
679 }
680
681 if (!tdev && p->link)
682 tdev = __dev_get_by_index(t->net, p->link);
683
684 if (tdev)
685 mtu = tdev->mtu - sizeof(struct ipv6hdr);
686 else
687 mtu = ETH_DATA_LEN - LL_MAX_HEADER - sizeof(struct ipv6hdr);
688
689 dev->mtu = max_t(int, mtu, IPV4_MIN_MTU);
690 }
691
692 /**
693 * vti6_tnl_change - update the tunnel parameters
694 * @t: tunnel to be changed
695 * @p: tunnel configuration parameters
696 * @keep_mtu: MTU was set from userspace, don't re-compute it
697 *
698 * Description:
699 * vti6_tnl_change() updates the tunnel parameters
700 **/
701 static int
702 vti6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
703 bool keep_mtu)
704 {
705 t->parms.laddr = p->laddr;
706 t->parms.raddr = p->raddr;
707 t->parms.link = p->link;
708 t->parms.i_key = p->i_key;
709 t->parms.o_key = p->o_key;
710 t->parms.proto = p->proto;
711 t->parms.fwmark = p->fwmark;
712 dst_cache_reset(&t->dst_cache);
713 vti6_link_config(t, keep_mtu);
714 return 0;
715 }
716
717 static int vti6_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p,
718 bool keep_mtu)
719 {
720 struct net *net = dev_net(t->dev);
721 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
722 int err;
723
724 vti6_tnl_unlink(ip6n, t);
725 synchronize_net();
726 err = vti6_tnl_change(t, p, keep_mtu);
727 vti6_tnl_link(ip6n, t);
728 netdev_state_change(t->dev);
729 return err;
730 }
731
732 static void
733 vti6_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm2 *u)
734 {
735 p->laddr = u->laddr;
736 p->raddr = u->raddr;
737 p->link = u->link;
738 p->i_key = u->i_key;
739 p->o_key = u->o_key;
740 p->proto = u->proto;
741
742 memcpy(p->name, u->name, sizeof(u->name));
743 }
744
745 static void
746 vti6_parm_to_user(struct ip6_tnl_parm2 *u, const struct __ip6_tnl_parm *p)
747 {
748 u->laddr = p->laddr;
749 u->raddr = p->raddr;
750 u->link = p->link;
751 u->i_key = p->i_key;
752 u->o_key = p->o_key;
753 if (u->i_key)
754 u->i_flags |= GRE_KEY;
755 if (u->o_key)
756 u->o_flags |= GRE_KEY;
757 u->proto = p->proto;
758
759 memcpy(u->name, p->name, sizeof(u->name));
760 }
761
762 /**
763 * vti6_ioctl - configure vti6 tunnels from userspace
764 * @dev: virtual device associated with tunnel
765 * @ifr: parameters passed from userspace
766 * @cmd: command to be performed
767 *
768 * Description:
769 * vti6_ioctl() is used for managing vti6 tunnels
770 * from userspace.
771 *
772 * The possible commands are the following:
773 * %SIOCGETTUNNEL: get tunnel parameters for device
774 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
775 * %SIOCCHGTUNNEL: change tunnel parameters to those given
776 * %SIOCDELTUNNEL: delete tunnel
777 *
778 * The fallback device "ip6_vti0", created during module
779 * initialization, can be used for creating other tunnel devices.
780 *
781 * Return:
782 * 0 on success,
783 * %-EFAULT if unable to copy data to or from userspace,
784 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
785 * %-EINVAL if passed tunnel parameters are invalid,
786 * %-EEXIST if changing a tunnel's parameters would cause a conflict
787 * %-ENODEV if attempting to change or delete a nonexisting device
788 **/
789 static int
790 vti6_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
791 {
792 int err = 0;
793 struct ip6_tnl_parm2 p;
794 struct __ip6_tnl_parm p1;
795 struct ip6_tnl *t = NULL;
796 struct net *net = dev_net(dev);
797 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
798
799 switch (cmd) {
800 case SIOCGETTUNNEL:
801 if (dev == ip6n->fb_tnl_dev) {
802 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
803 err = -EFAULT;
804 break;
805 }
806 vti6_parm_from_user(&p1, &p);
807 t = vti6_locate(net, &p1, 0);
808 } else {
809 memset(&p, 0, sizeof(p));
810 }
811 if (!t)
812 t = netdev_priv(dev);
813 vti6_parm_to_user(&p, &t->parms);
814 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
815 err = -EFAULT;
816 break;
817 case SIOCADDTUNNEL:
818 case SIOCCHGTUNNEL:
819 err = -EPERM;
820 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
821 break;
822 err = -EFAULT;
823 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
824 break;
825 err = -EINVAL;
826 if (p.proto != IPPROTO_IPV6 && p.proto != 0)
827 break;
828 vti6_parm_from_user(&p1, &p);
829 t = vti6_locate(net, &p1, cmd == SIOCADDTUNNEL);
830 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
831 if (t) {
832 if (t->dev != dev) {
833 err = -EEXIST;
834 break;
835 }
836 } else
837 t = netdev_priv(dev);
838
839 err = vti6_update(t, &p1, false);
840 }
841 if (t) {
842 err = 0;
843 vti6_parm_to_user(&p, &t->parms);
844 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
845 err = -EFAULT;
846
847 } else
848 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
849 break;
850 case SIOCDELTUNNEL:
851 err = -EPERM;
852 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
853 break;
854
855 if (dev == ip6n->fb_tnl_dev) {
856 err = -EFAULT;
857 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
858 break;
859 err = -ENOENT;
860 vti6_parm_from_user(&p1, &p);
861 t = vti6_locate(net, &p1, 0);
862 if (!t)
863 break;
864 err = -EPERM;
865 if (t->dev == ip6n->fb_tnl_dev)
866 break;
867 dev = t->dev;
868 }
869 err = 0;
870 unregister_netdevice(dev);
871 break;
872 default:
873 err = -EINVAL;
874 }
875 return err;
876 }
877
878 static const struct net_device_ops vti6_netdev_ops = {
879 .ndo_init = vti6_dev_init,
880 .ndo_uninit = vti6_dev_uninit,
881 .ndo_start_xmit = vti6_tnl_xmit,
882 .ndo_do_ioctl = vti6_ioctl,
883 .ndo_get_stats64 = ip_tunnel_get_stats64,
884 .ndo_get_iflink = ip6_tnl_get_iflink,
885 };
886
887 /**
888 * vti6_dev_setup - setup virtual tunnel device
889 * @dev: virtual device associated with tunnel
890 *
891 * Description:
892 * Initialize function pointers and device parameters
893 **/
894 static void vti6_dev_setup(struct net_device *dev)
895 {
896 dev->netdev_ops = &vti6_netdev_ops;
897 dev->needs_free_netdev = true;
898 dev->priv_destructor = vti6_dev_free;
899
900 dev->type = ARPHRD_TUNNEL6;
901 dev->min_mtu = IPV4_MIN_MTU;
902 dev->max_mtu = IP_MAX_MTU - sizeof(struct ipv6hdr);
903 dev->flags |= IFF_NOARP;
904 dev->addr_len = sizeof(struct in6_addr);
905 netif_keep_dst(dev);
906 /* This perm addr will be used as interface identifier by IPv6 */
907 dev->addr_assign_type = NET_ADDR_RANDOM;
908 eth_random_addr(dev->perm_addr);
909 }
910
911 /**
912 * vti6_dev_init_gen - general initializer for all tunnel devices
913 * @dev: virtual device associated with tunnel
914 **/
915 static inline int vti6_dev_init_gen(struct net_device *dev)
916 {
917 struct ip6_tnl *t = netdev_priv(dev);
918
919 t->dev = dev;
920 t->net = dev_net(dev);
921 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
922 if (!dev->tstats)
923 return -ENOMEM;
924 return 0;
925 }
926
927 /**
928 * vti6_dev_init - initializer for all non fallback tunnel devices
929 * @dev: virtual device associated with tunnel
930 **/
931 static int vti6_dev_init(struct net_device *dev)
932 {
933 struct ip6_tnl *t = netdev_priv(dev);
934 int err = vti6_dev_init_gen(dev);
935
936 if (err)
937 return err;
938 vti6_link_config(t, true);
939 return 0;
940 }
941
942 /**
943 * vti6_fb_tnl_dev_init - initializer for fallback tunnel device
944 * @dev: fallback device
945 *
946 * Return: 0
947 **/
948 static int __net_init vti6_fb_tnl_dev_init(struct net_device *dev)
949 {
950 struct ip6_tnl *t = netdev_priv(dev);
951 struct net *net = dev_net(dev);
952 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
953
954 t->parms.proto = IPPROTO_IPV6;
955 dev_hold(dev);
956
957 rcu_assign_pointer(ip6n->tnls_wc[0], t);
958 return 0;
959 }
960
961 static int vti6_validate(struct nlattr *tb[], struct nlattr *data[],
962 struct netlink_ext_ack *extack)
963 {
964 return 0;
965 }
966
967 static void vti6_netlink_parms(struct nlattr *data[],
968 struct __ip6_tnl_parm *parms)
969 {
970 memset(parms, 0, sizeof(*parms));
971
972 if (!data)
973 return;
974
975 if (data[IFLA_VTI_LINK])
976 parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
977
978 if (data[IFLA_VTI_LOCAL])
979 parms->laddr = nla_get_in6_addr(data[IFLA_VTI_LOCAL]);
980
981 if (data[IFLA_VTI_REMOTE])
982 parms->raddr = nla_get_in6_addr(data[IFLA_VTI_REMOTE]);
983
984 if (data[IFLA_VTI_IKEY])
985 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
986
987 if (data[IFLA_VTI_OKEY])
988 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
989
990 if (data[IFLA_VTI_FWMARK])
991 parms->fwmark = nla_get_u32(data[IFLA_VTI_FWMARK]);
992 }
993
994 static int vti6_newlink(struct net *src_net, struct net_device *dev,
995 struct nlattr *tb[], struct nlattr *data[],
996 struct netlink_ext_ack *extack)
997 {
998 struct net *net = dev_net(dev);
999 struct ip6_tnl *nt;
1000
1001 nt = netdev_priv(dev);
1002 vti6_netlink_parms(data, &nt->parms);
1003
1004 nt->parms.proto = IPPROTO_IPV6;
1005
1006 if (vti6_locate(net, &nt->parms, 0))
1007 return -EEXIST;
1008
1009 return vti6_tnl_create2(dev);
1010 }
1011
1012 static void vti6_dellink(struct net_device *dev, struct list_head *head)
1013 {
1014 struct net *net = dev_net(dev);
1015 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1016
1017 if (dev != ip6n->fb_tnl_dev)
1018 unregister_netdevice_queue(dev, head);
1019 }
1020
1021 static int vti6_changelink(struct net_device *dev, struct nlattr *tb[],
1022 struct nlattr *data[],
1023 struct netlink_ext_ack *extack)
1024 {
1025 struct ip6_tnl *t;
1026 struct __ip6_tnl_parm p;
1027 struct net *net = dev_net(dev);
1028 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1029
1030 if (dev == ip6n->fb_tnl_dev)
1031 return -EINVAL;
1032
1033 vti6_netlink_parms(data, &p);
1034
1035 t = vti6_locate(net, &p, 0);
1036
1037 if (t) {
1038 if (t->dev != dev)
1039 return -EEXIST;
1040 } else
1041 t = netdev_priv(dev);
1042
1043 return vti6_update(t, &p, tb && tb[IFLA_MTU]);
1044 }
1045
1046 static size_t vti6_get_size(const struct net_device *dev)
1047 {
1048 return
1049 /* IFLA_VTI_LINK */
1050 nla_total_size(4) +
1051 /* IFLA_VTI_LOCAL */
1052 nla_total_size(sizeof(struct in6_addr)) +
1053 /* IFLA_VTI_REMOTE */
1054 nla_total_size(sizeof(struct in6_addr)) +
1055 /* IFLA_VTI_IKEY */
1056 nla_total_size(4) +
1057 /* IFLA_VTI_OKEY */
1058 nla_total_size(4) +
1059 /* IFLA_VTI_FWMARK */
1060 nla_total_size(4) +
1061 0;
1062 }
1063
1064 static int vti6_fill_info(struct sk_buff *skb, const struct net_device *dev)
1065 {
1066 struct ip6_tnl *tunnel = netdev_priv(dev);
1067 struct __ip6_tnl_parm *parm = &tunnel->parms;
1068
1069 if (nla_put_u32(skb, IFLA_VTI_LINK, parm->link) ||
1070 nla_put_in6_addr(skb, IFLA_VTI_LOCAL, &parm->laddr) ||
1071 nla_put_in6_addr(skb, IFLA_VTI_REMOTE, &parm->raddr) ||
1072 nla_put_be32(skb, IFLA_VTI_IKEY, parm->i_key) ||
1073 nla_put_be32(skb, IFLA_VTI_OKEY, parm->o_key) ||
1074 nla_put_u32(skb, IFLA_VTI_FWMARK, parm->fwmark))
1075 goto nla_put_failure;
1076 return 0;
1077
1078 nla_put_failure:
1079 return -EMSGSIZE;
1080 }
1081
1082 static const struct nla_policy vti6_policy[IFLA_VTI_MAX + 1] = {
1083 [IFLA_VTI_LINK] = { .type = NLA_U32 },
1084 [IFLA_VTI_LOCAL] = { .len = sizeof(struct in6_addr) },
1085 [IFLA_VTI_REMOTE] = { .len = sizeof(struct in6_addr) },
1086 [IFLA_VTI_IKEY] = { .type = NLA_U32 },
1087 [IFLA_VTI_OKEY] = { .type = NLA_U32 },
1088 [IFLA_VTI_FWMARK] = { .type = NLA_U32 },
1089 };
1090
1091 static struct rtnl_link_ops vti6_link_ops __read_mostly = {
1092 .kind = "vti6",
1093 .maxtype = IFLA_VTI_MAX,
1094 .policy = vti6_policy,
1095 .priv_size = sizeof(struct ip6_tnl),
1096 .setup = vti6_dev_setup,
1097 .validate = vti6_validate,
1098 .newlink = vti6_newlink,
1099 .dellink = vti6_dellink,
1100 .changelink = vti6_changelink,
1101 .get_size = vti6_get_size,
1102 .fill_info = vti6_fill_info,
1103 .get_link_net = ip6_tnl_get_link_net,
1104 };
1105
1106 static void __net_exit vti6_destroy_tunnels(struct vti6_net *ip6n,
1107 struct list_head *list)
1108 {
1109 int h;
1110 struct ip6_tnl *t;
1111
1112 for (h = 0; h < IP6_VTI_HASH_SIZE; h++) {
1113 t = rtnl_dereference(ip6n->tnls_r_l[h]);
1114 while (t) {
1115 unregister_netdevice_queue(t->dev, list);
1116 t = rtnl_dereference(t->next);
1117 }
1118 }
1119
1120 t = rtnl_dereference(ip6n->tnls_wc[0]);
1121 if (t)
1122 unregister_netdevice_queue(t->dev, list);
1123 }
1124
1125 static int __net_init vti6_init_net(struct net *net)
1126 {
1127 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1128 struct ip6_tnl *t = NULL;
1129 int err;
1130
1131 ip6n->tnls[0] = ip6n->tnls_wc;
1132 ip6n->tnls[1] = ip6n->tnls_r_l;
1133
1134 if (!net_has_fallback_tunnels(net))
1135 return 0;
1136 err = -ENOMEM;
1137 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6_vti0",
1138 NET_NAME_UNKNOWN, vti6_dev_setup);
1139
1140 if (!ip6n->fb_tnl_dev)
1141 goto err_alloc_dev;
1142 dev_net_set(ip6n->fb_tnl_dev, net);
1143 ip6n->fb_tnl_dev->rtnl_link_ops = &vti6_link_ops;
1144
1145 err = vti6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1146 if (err < 0)
1147 goto err_register;
1148
1149 err = register_netdev(ip6n->fb_tnl_dev);
1150 if (err < 0)
1151 goto err_register;
1152
1153 t = netdev_priv(ip6n->fb_tnl_dev);
1154
1155 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
1156 return 0;
1157
1158 err_register:
1159 free_netdev(ip6n->fb_tnl_dev);
1160 err_alloc_dev:
1161 return err;
1162 }
1163
1164 static void __net_exit vti6_exit_batch_net(struct list_head *net_list)
1165 {
1166 struct vti6_net *ip6n;
1167 struct net *net;
1168 LIST_HEAD(list);
1169
1170 rtnl_lock();
1171 list_for_each_entry(net, net_list, exit_list) {
1172 ip6n = net_generic(net, vti6_net_id);
1173 vti6_destroy_tunnels(ip6n, &list);
1174 }
1175 unregister_netdevice_many(&list);
1176 rtnl_unlock();
1177 }
1178
1179 static struct pernet_operations vti6_net_ops = {
1180 .init = vti6_init_net,
1181 .exit_batch = vti6_exit_batch_net,
1182 .id = &vti6_net_id,
1183 .size = sizeof(struct vti6_net),
1184 };
1185
1186 static struct xfrm6_protocol vti_esp6_protocol __read_mostly = {
1187 .handler = vti6_rcv,
1188 .cb_handler = vti6_rcv_cb,
1189 .err_handler = vti6_err,
1190 .priority = 100,
1191 };
1192
1193 static struct xfrm6_protocol vti_ah6_protocol __read_mostly = {
1194 .handler = vti6_rcv,
1195 .cb_handler = vti6_rcv_cb,
1196 .err_handler = vti6_err,
1197 .priority = 100,
1198 };
1199
1200 static struct xfrm6_protocol vti_ipcomp6_protocol __read_mostly = {
1201 .handler = vti6_rcv,
1202 .cb_handler = vti6_rcv_cb,
1203 .err_handler = vti6_err,
1204 .priority = 100,
1205 };
1206
1207 /**
1208 * vti6_tunnel_init - register protocol and reserve needed resources
1209 *
1210 * Return: 0 on success
1211 **/
1212 static int __init vti6_tunnel_init(void)
1213 {
1214 const char *msg;
1215 int err;
1216
1217 msg = "tunnel device";
1218 err = register_pernet_device(&vti6_net_ops);
1219 if (err < 0)
1220 goto pernet_dev_failed;
1221
1222 msg = "tunnel protocols";
1223 err = xfrm6_protocol_register(&vti_esp6_protocol, IPPROTO_ESP);
1224 if (err < 0)
1225 goto xfrm_proto_esp_failed;
1226 err = xfrm6_protocol_register(&vti_ah6_protocol, IPPROTO_AH);
1227 if (err < 0)
1228 goto xfrm_proto_ah_failed;
1229 err = xfrm6_protocol_register(&vti_ipcomp6_protocol, IPPROTO_COMP);
1230 if (err < 0)
1231 goto xfrm_proto_comp_failed;
1232
1233 msg = "netlink interface";
1234 err = rtnl_link_register(&vti6_link_ops);
1235 if (err < 0)
1236 goto rtnl_link_failed;
1237
1238 return 0;
1239
1240 rtnl_link_failed:
1241 xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1242 xfrm_proto_comp_failed:
1243 xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1244 xfrm_proto_ah_failed:
1245 xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1246 xfrm_proto_esp_failed:
1247 unregister_pernet_device(&vti6_net_ops);
1248 pernet_dev_failed:
1249 pr_err("vti6 init: failed to register %s\n", msg);
1250 return err;
1251 }
1252
1253 /**
1254 * vti6_tunnel_cleanup - free resources and unregister protocol
1255 **/
1256 static void __exit vti6_tunnel_cleanup(void)
1257 {
1258 rtnl_link_unregister(&vti6_link_ops);
1259 xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1260 xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1261 xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1262 unregister_pernet_device(&vti6_net_ops);
1263 }
1264
1265 module_init(vti6_tunnel_init);
1266 module_exit(vti6_tunnel_cleanup);
1267 MODULE_LICENSE("GPL");
1268 MODULE_ALIAS_RTNL_LINK("vti6");
1269 MODULE_ALIAS_NETDEV("ip6_vti0");
1270 MODULE_AUTHOR("Steffen Klassert");
1271 MODULE_DESCRIPTION("IPv6 virtual tunnel interface");
Linux with added FPC-III support