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TOMOYO Linux Cross Reference
Linux/net/ipv6/ip6_vti.c

Version: ~ [ linux-6.2-rc3 ] ~ [ linux-6.1.5 ] ~ [ linux-6.0.19 ] ~ [ linux-5.19.17 ] ~ [ linux-5.18.19 ] ~ [ linux-5.17.15 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.87 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.162 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.228 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.269 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.302 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.337 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.302 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.9 ] ~ [ policy-sample ] ~
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  1 /*
  2  *      IPv6 virtual tunneling interface
  3  *
  4  *      Copyright (C) 2013 secunet Security Networks AG
  5  *
  6  *      Author:
  7  *      Steffen Klassert <steffen.klassert@secunet.com>
  8  *
  9  *      Based on:
 10  *      net/ipv6/ip6_tunnel.c
 11  *
 12  *      This program is free software; you can redistribute it and/or
 13  *      modify it under the terms of the GNU General Public License
 14  *      as published by the Free Software Foundation; either version
 15  *      2 of the License, or (at your option) any later version.
 16  */
 17 
 18 #include <linux/module.h>
 19 #include <linux/capability.h>
 20 #include <linux/errno.h>
 21 #include <linux/types.h>
 22 #include <linux/sockios.h>
 23 #include <linux/icmp.h>
 24 #include <linux/if.h>
 25 #include <linux/in.h>
 26 #include <linux/ip.h>
 27 #include <linux/net.h>
 28 #include <linux/in6.h>
 29 #include <linux/netdevice.h>
 30 #include <linux/if_arp.h>
 31 #include <linux/icmpv6.h>
 32 #include <linux/init.h>
 33 #include <linux/route.h>
 34 #include <linux/rtnetlink.h>
 35 #include <linux/netfilter_ipv6.h>
 36 #include <linux/slab.h>
 37 #include <linux/hash.h>
 38 
 39 #include <linux/uaccess.h>
 40 #include <linux/atomic.h>
 41 
 42 #include <net/icmp.h>
 43 #include <net/ip.h>
 44 #include <net/ip_tunnels.h>
 45 #include <net/ipv6.h>
 46 #include <net/ip6_route.h>
 47 #include <net/addrconf.h>
 48 #include <net/ip6_tunnel.h>
 49 #include <net/xfrm.h>
 50 #include <net/net_namespace.h>
 51 #include <net/netns/generic.h>
 52 
 53 #define HASH_SIZE_SHIFT  5
 54 #define HASH_SIZE (1 << HASH_SIZE_SHIFT)
 55 
 56 static 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 
 63 static int vti6_dev_init(struct net_device *dev);
 64 static void vti6_dev_setup(struct net_device *dev);
 65 static struct rtnl_link_ops vti6_link_ops __read_mostly;
 66 
 67 static int vti6_net_id __read_mostly;
 68 struct vti6_net {
 69         /* the vti6 tunnel fallback device */
 70         struct net_device *fb_tnl_dev;
 71         /* lists for storing tunnels in use */
 72         struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE];
 73         struct ip6_tnl __rcu *tnls_wc[1];
 74         struct ip6_tnl __rcu **tnls[2];
 75 };
 76 
 77 #define for_each_vti6_tunnel_rcu(start) \
 78         for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
 79 
 80 /**
 81  * vti6_tnl_lookup - fetch tunnel matching the end-point addresses
 82  *   @net: network namespace
 83  *   @remote: the address of the tunnel exit-point
 84  *   @local: the address of the tunnel entry-point
 85  *
 86  * Return:
 87  *   tunnel matching given end-points if found,
 88  *   else fallback tunnel if its device is up,
 89  *   else %NULL
 90  **/
 91 static struct ip6_tnl *
 92 vti6_tnl_lookup(struct net *net, const struct in6_addr *remote,
 93                 const struct in6_addr *local)
 94 {
 95         unsigned int hash = HASH(remote, local);
 96         struct ip6_tnl *t;
 97         struct vti6_net *ip6n = net_generic(net, vti6_net_id);
 98         struct in6_addr any;
 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         }
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 
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  **/
139 static struct ip6_tnl __rcu **
140 vti6_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 
154 static void
155 vti6_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 
163 static void
164 vti6_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 
179 static void vti6_dev_free(struct net_device *dev)
180 {
181         free_percpu(dev->tstats);
182         free_netdev(dev);
183 }
184 
185 static int vti6_tnl_create2(struct net_device *dev)
186 {
187         struct ip6_tnl *t = netdev_priv(dev);
188         struct net *net = dev_net(dev);
189         struct vti6_net *ip6n = net_generic(net, vti6_net_id);
190         int err;
191 
192         dev->rtnl_link_ops = &vti6_link_ops;
193         err = register_netdevice(dev);
194         if (err < 0)
195                 goto out;
196 
197         strcpy(t->parms.name, dev->name);
198 
199         vti6_tnl_link(ip6n, t);
200 
201         return 0;
202 
203 out:
204         return err;
205 }
206 
207 static struct ip6_tnl *vti6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
208 {
209         struct net_device *dev;
210         struct ip6_tnl *t;
211         char name[IFNAMSIZ];
212         int err;
213 
214         if (p->name[0]) {
215                 if (!dev_valid_name(p->name))
216                         goto failed;
217                 strlcpy(name, p->name, IFNAMSIZ);
218         } else {
219                 sprintf(name, "ip6_vti%%d");
220         }
221 
222         dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, vti6_dev_setup);
223         if (!dev)
224                 goto failed;
225 
226         dev_net_set(dev, net);
227 
228         t = netdev_priv(dev);
229         t->parms = *p;
230         t->net = dev_net(dev);
231 
232         err = vti6_tnl_create2(dev);
233         if (err < 0)
234                 goto failed_free;
235 
236         return t;
237 
238 failed_free:
239         vti6_dev_free(dev);
240 failed:
241         return NULL;
242 }
243 
244 /**
245  * vti6_locate - find or create tunnel matching given parameters
246  *   @net: network namespace
247  *   @p: tunnel parameters
248  *   @create: != 0 if allowed to create new tunnel if no match found
249  *
250  * Description:
251  *   vti6_locate() first tries to locate an existing tunnel
252  *   based on @parms. If this is unsuccessful, but @create is set a new
253  *   tunnel device is created and registered for use.
254  *
255  * Return:
256  *   matching tunnel or NULL
257  **/
258 static struct ip6_tnl *vti6_locate(struct net *net, struct __ip6_tnl_parm *p,
259                                    int create)
260 {
261         const struct in6_addr *remote = &p->raddr;
262         const struct in6_addr *local = &p->laddr;
263         struct ip6_tnl __rcu **tp;
264         struct ip6_tnl *t;
265         struct vti6_net *ip6n = net_generic(net, vti6_net_id);
266 
267         for (tp = vti6_tnl_bucket(ip6n, p);
268              (t = rtnl_dereference(*tp)) != NULL;
269              tp = &t->next) {
270                 if (ipv6_addr_equal(local, &t->parms.laddr) &&
271                     ipv6_addr_equal(remote, &t->parms.raddr)) {
272                         if (create)
273                                 return NULL;
274 
275                         return t;
276                 }
277         }
278         if (!create)
279                 return NULL;
280         return vti6_tnl_create(net, p);
281 }
282 
283 /**
284  * vti6_dev_uninit - tunnel device uninitializer
285  *   @dev: the device to be destroyed
286  *
287  * Description:
288  *   vti6_dev_uninit() removes tunnel from its list
289  **/
290 static void vti6_dev_uninit(struct net_device *dev)
291 {
292         struct ip6_tnl *t = netdev_priv(dev);
293         struct vti6_net *ip6n = net_generic(t->net, vti6_net_id);
294 
295         if (dev == ip6n->fb_tnl_dev)
296                 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
297         else
298                 vti6_tnl_unlink(ip6n, t);
299         dev_put(dev);
300 }
301 
302 static int vti6_rcv(struct sk_buff *skb)
303 {
304         struct ip6_tnl *t;
305         const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
306 
307         rcu_read_lock();
308         t = vti6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr);
309         if (t) {
310                 if (t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) {
311                         rcu_read_unlock();
312                         goto discard;
313                 }
314 
315                 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
316                         rcu_read_unlock();
317                         goto discard;
318                 }
319 
320                 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) {
321                         t->dev->stats.rx_dropped++;
322                         rcu_read_unlock();
323                         goto discard;
324                 }
325 
326                 rcu_read_unlock();
327 
328                 return xfrm6_rcv_tnl(skb, t);
329         }
330         rcu_read_unlock();
331         return -EINVAL;
332 discard:
333         kfree_skb(skb);
334         return 0;
335 }
336 
337 static int vti6_rcv_cb(struct sk_buff *skb, int err)
338 {
339         unsigned short family;
340         struct net_device *dev;
341         struct pcpu_sw_netstats *tstats;
342         struct xfrm_state *x;
343         struct ip6_tnl *t = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6;
344         u32 orig_mark = skb->mark;
345         int ret;
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         skb->mark = be32_to_cpu(t->parms.i_key);
363         ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family);
364         skb->mark = orig_mark;
365 
366         if (!ret)
367                 return -EPERM;
368 
369         skb_scrub_packet(skb, !net_eq(t->net, dev_net(skb->dev)));
370         skb->dev = dev;
371 
372         tstats = this_cpu_ptr(dev->tstats);
373         u64_stats_update_begin(&tstats->syncp);
374         tstats->rx_packets++;
375         tstats->rx_bytes += skb->len;
376         u64_stats_update_end(&tstats->syncp);
377 
378         return 0;
379 }
380 
381 /**
382  * vti6_addr_conflict - compare packet addresses to tunnel's own
383  *   @t: the outgoing tunnel device
384  *   @hdr: IPv6 header from the incoming packet
385  *
386  * Description:
387  *   Avoid trivial tunneling loop by checking that tunnel exit-point
388  *   doesn't match source of incoming packet.
389  *
390  * Return:
391  *   1 if conflict,
392  *   0 else
393  **/
394 static inline bool
395 vti6_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
396 {
397         return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
398 }
399 
400 static bool vti6_state_check(const struct xfrm_state *x,
401                              const struct in6_addr *dst,
402                              const struct in6_addr *src)
403 {
404         xfrm_address_t *daddr = (xfrm_address_t *)dst;
405         xfrm_address_t *saddr = (xfrm_address_t *)src;
406 
407         /* if there is no transform then this tunnel is not functional.
408          * Or if the xfrm is not mode tunnel.
409          */
410         if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
411             x->props.family != AF_INET6)
412                 return false;
413 
414         if (ipv6_addr_any(dst))
415                 return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET6);
416 
417         if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET6))
418                 return false;
419 
420         return true;
421 }
422 
423 /**
424  * vti6_xmit - send a packet
425  *   @skb: the outgoing socket buffer
426  *   @dev: the outgoing tunnel device
427  *   @fl: the flow informations for the xfrm_lookup
428  **/
429 static int
430 vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
431 {
432         struct ip6_tnl *t = netdev_priv(dev);
433         struct net_device_stats *stats = &t->dev->stats;
434         struct dst_entry *dst = skb_dst(skb);
435         struct net_device *tdev;
436         struct xfrm_state *x;
437         int pkt_len = skb->len;
438         int err = -1;
439         int mtu;
440 
441         if (!dst) {
442                 switch (skb->protocol) {
443                 case htons(ETH_P_IP): {
444                         struct rtable *rt;
445 
446                         fl->u.ip4.flowi4_oif = dev->ifindex;
447                         fl->u.ip4.flowi4_flags |= FLOWI_FLAG_ANYSRC;
448                         rt = __ip_route_output_key(dev_net(dev), &fl->u.ip4);
449                         if (IS_ERR(rt))
450                                 goto tx_err_link_failure;
451                         dst = &rt->dst;
452                         skb_dst_set(skb, dst);
453                         break;
454                 }
455                 case htons(ETH_P_IPV6):
456                         fl->u.ip6.flowi6_oif = dev->ifindex;
457                         fl->u.ip6.flowi6_flags |= FLOWI_FLAG_ANYSRC;
458                         dst = ip6_route_output(dev_net(dev), NULL, &fl->u.ip6);
459                         if (dst->error) {
460                                 dst_release(dst);
461                                 dst = NULL;
462                                 goto tx_err_link_failure;
463                         }
464                         skb_dst_set(skb, dst);
465                         break;
466                 default:
467                         goto tx_err_link_failure;
468                 }
469         }
470 
471         dst_hold(dst);
472         dst = xfrm_lookup(t->net, dst, fl, NULL, 0);
473         if (IS_ERR(dst)) {
474                 err = PTR_ERR(dst);
475                 dst = NULL;
476                 goto tx_err_link_failure;
477         }
478 
479         x = dst->xfrm;
480         if (!vti6_state_check(x, &t->parms.raddr, &t->parms.laddr))
481                 goto tx_err_link_failure;
482 
483         if (!ip6_tnl_xmit_ctl(t, (const struct in6_addr *)&x->props.saddr,
484                               (const struct in6_addr *)&x->id.daddr))
485                 goto tx_err_link_failure;
486 
487         tdev = dst->dev;
488 
489         if (tdev == dev) {
490                 stats->collisions++;
491                 net_warn_ratelimited("%s: Local routing loop detected!\n",
492                                      t->parms.name);
493                 goto tx_err_dst_release;
494         }
495 
496         mtu = dst_mtu(dst);
497         if (skb->len > mtu) {
498                 skb_dst(skb)->ops->update_pmtu(dst, NULL, skb, mtu);
499 
500                 if (skb->protocol == htons(ETH_P_IPV6)) {
501                         if (mtu < IPV6_MIN_MTU)
502                                 mtu = IPV6_MIN_MTU;
503 
504                         icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
505                 } else {
506                         icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
507                                   htonl(mtu));
508                 }
509 
510                 err = -EMSGSIZE;
511                 goto tx_err_dst_release;
512         }
513 
514         skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
515         skb_dst_set(skb, dst);
516         skb->dev = skb_dst(skb)->dev;
517 
518         err = dst_output(t->net, skb->sk, skb);
519         if (net_xmit_eval(err) == 0) {
520                 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
521 
522                 u64_stats_update_begin(&tstats->syncp);
523                 tstats->tx_bytes += pkt_len;
524                 tstats->tx_packets++;
525                 u64_stats_update_end(&tstats->syncp);
526         } else {
527                 stats->tx_errors++;
528                 stats->tx_aborted_errors++;
529         }
530 
531         return 0;
532 tx_err_link_failure:
533         stats->tx_carrier_errors++;
534         dst_link_failure(skb);
535 tx_err_dst_release:
536         dst_release(dst);
537         return err;
538 }
539 
540 static netdev_tx_t
541 vti6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
542 {
543         struct ip6_tnl *t = netdev_priv(dev);
544         struct net_device_stats *stats = &t->dev->stats;
545         struct ipv6hdr *ipv6h;
546         struct flowi fl;
547         int ret;
548 
549         memset(&fl, 0, sizeof(fl));
550 
551         switch (skb->protocol) {
552         case htons(ETH_P_IPV6):
553                 ipv6h = ipv6_hdr(skb);
554 
555                 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
556                     vti6_addr_conflict(t, ipv6h))
557                         goto tx_err;
558 
559                 xfrm_decode_session(skb, &fl, AF_INET6);
560                 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
561                 break;
562         case htons(ETH_P_IP):
563                 xfrm_decode_session(skb, &fl, AF_INET);
564                 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
565                 break;
566         default:
567                 goto tx_err;
568         }
569 
570         /* override mark with tunnel output key */
571         fl.flowi_mark = be32_to_cpu(t->parms.o_key);
572 
573         ret = vti6_xmit(skb, dev, &fl);
574         if (ret < 0)
575                 goto tx_err;
576 
577         return NETDEV_TX_OK;
578 
579 tx_err:
580         stats->tx_errors++;
581         stats->tx_dropped++;
582         kfree_skb(skb);
583         return NETDEV_TX_OK;
584 }
585 
586 static int vti6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
587                     u8 type, u8 code, int offset, __be32 info)
588 {
589         __be32 spi;
590         __u32 mark;
591         struct xfrm_state *x;
592         struct ip6_tnl *t;
593         struct ip_esp_hdr *esph;
594         struct ip_auth_hdr *ah;
595         struct ip_comp_hdr *ipch;
596         struct net *net = dev_net(skb->dev);
597         const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
598         int protocol = iph->nexthdr;
599 
600         t = vti6_tnl_lookup(dev_net(skb->dev), &iph->daddr, &iph->saddr);
601         if (!t)
602                 return -1;
603 
604         mark = be32_to_cpu(t->parms.o_key);
605 
606         switch (protocol) {
607         case IPPROTO_ESP:
608                 esph = (struct ip_esp_hdr *)(skb->data + offset);
609                 spi = esph->spi;
610                 break;
611         case IPPROTO_AH:
612                 ah = (struct ip_auth_hdr *)(skb->data + offset);
613                 spi = ah->spi;
614                 break;
615         case IPPROTO_COMP:
616                 ipch = (struct ip_comp_hdr *)(skb->data + offset);
617                 spi = htonl(ntohs(ipch->cpi));
618                 break;
619         default:
620                 return 0;
621         }
622 
623         if (type != ICMPV6_PKT_TOOBIG &&
624             type != NDISC_REDIRECT)
625                 return 0;
626 
627         x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
628                               spi, protocol, AF_INET6);
629         if (!x)
630                 return 0;
631 
632         if (type == NDISC_REDIRECT)
633                 ip6_redirect(skb, net, skb->dev->ifindex, 0);
634         else
635                 ip6_update_pmtu(skb, net, info, 0, 0);
636         xfrm_state_put(x);
637 
638         return 0;
639 }
640 
641 static void vti6_link_config(struct ip6_tnl *t)
642 {
643         struct net_device *dev = t->dev;
644         struct __ip6_tnl_parm *p = &t->parms;
645 
646         memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
647         memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
648 
649         p->flags &= ~(IP6_TNL_F_CAP_XMIT | IP6_TNL_F_CAP_RCV |
650                       IP6_TNL_F_CAP_PER_PACKET);
651         p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
652 
653         if (p->flags & IP6_TNL_F_CAP_XMIT && p->flags & IP6_TNL_F_CAP_RCV)
654                 dev->flags |= IFF_POINTOPOINT;
655         else
656                 dev->flags &= ~IFF_POINTOPOINT;
657 }
658 
659 /**
660  * vti6_tnl_change - update the tunnel parameters
661  *   @t: tunnel to be changed
662  *   @p: tunnel configuration parameters
663  *
664  * Description:
665  *   vti6_tnl_change() updates the tunnel parameters
666  **/
667 static int
668 vti6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
669 {
670         t->parms.laddr = p->laddr;
671         t->parms.raddr = p->raddr;
672         t->parms.link = p->link;
673         t->parms.i_key = p->i_key;
674         t->parms.o_key = p->o_key;
675         t->parms.proto = p->proto;
676         dst_cache_reset(&t->dst_cache);
677         vti6_link_config(t);
678         return 0;
679 }
680 
681 static int vti6_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
682 {
683         struct net *net = dev_net(t->dev);
684         struct vti6_net *ip6n = net_generic(net, vti6_net_id);
685         int err;
686 
687         vti6_tnl_unlink(ip6n, t);
688         synchronize_net();
689         err = vti6_tnl_change(t, p);
690         vti6_tnl_link(ip6n, t);
691         netdev_state_change(t->dev);
692         return err;
693 }
694 
695 static void
696 vti6_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm2 *u)
697 {
698         p->laddr = u->laddr;
699         p->raddr = u->raddr;
700         p->link = u->link;
701         p->i_key = u->i_key;
702         p->o_key = u->o_key;
703         p->proto = u->proto;
704 
705         memcpy(p->name, u->name, sizeof(u->name));
706 }
707 
708 static void
709 vti6_parm_to_user(struct ip6_tnl_parm2 *u, const struct __ip6_tnl_parm *p)
710 {
711         u->laddr = p->laddr;
712         u->raddr = p->raddr;
713         u->link = p->link;
714         u->i_key = p->i_key;
715         u->o_key = p->o_key;
716         if (u->i_key)
717                 u->i_flags |= GRE_KEY;
718         if (u->o_key)
719                 u->o_flags |= GRE_KEY;
720         u->proto = p->proto;
721 
722         memcpy(u->name, p->name, sizeof(u->name));
723 }
724 
725 /**
726  * vti6_tnl_ioctl - configure vti6 tunnels from userspace
727  *   @dev: virtual device associated with tunnel
728  *   @ifr: parameters passed from userspace
729  *   @cmd: command to be performed
730  *
731  * Description:
732  *   vti6_ioctl() is used for managing vti6 tunnels
733  *   from userspace.
734  *
735  *   The possible commands are the following:
736  *     %SIOCGETTUNNEL: get tunnel parameters for device
737  *     %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
738  *     %SIOCCHGTUNNEL: change tunnel parameters to those given
739  *     %SIOCDELTUNNEL: delete tunnel
740  *
741  *   The fallback device "ip6_vti0", created during module
742  *   initialization, can be used for creating other tunnel devices.
743  *
744  * Return:
745  *   0 on success,
746  *   %-EFAULT if unable to copy data to or from userspace,
747  *   %-EPERM if current process hasn't %CAP_NET_ADMIN set
748  *   %-EINVAL if passed tunnel parameters are invalid,
749  *   %-EEXIST if changing a tunnel's parameters would cause a conflict
750  *   %-ENODEV if attempting to change or delete a nonexisting device
751  **/
752 static int
753 vti6_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
754 {
755         int err = 0;
756         struct ip6_tnl_parm2 p;
757         struct __ip6_tnl_parm p1;
758         struct ip6_tnl *t = NULL;
759         struct net *net = dev_net(dev);
760         struct vti6_net *ip6n = net_generic(net, vti6_net_id);
761 
762         memset(&p1, 0, sizeof(p1));
763 
764         switch (cmd) {
765         case SIOCGETTUNNEL:
766                 if (dev == ip6n->fb_tnl_dev) {
767                         if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
768                                 err = -EFAULT;
769                                 break;
770                         }
771                         vti6_parm_from_user(&p1, &p);
772                         t = vti6_locate(net, &p1, 0);
773                 } else {
774                         memset(&p, 0, sizeof(p));
775                 }
776                 if (!t)
777                         t = netdev_priv(dev);
778                 vti6_parm_to_user(&p, &t->parms);
779                 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
780                         err = -EFAULT;
781                 break;
782         case SIOCADDTUNNEL:
783         case SIOCCHGTUNNEL:
784                 err = -EPERM;
785                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
786                         break;
787                 err = -EFAULT;
788                 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
789                         break;
790                 err = -EINVAL;
791                 if (p.proto != IPPROTO_IPV6  && p.proto != 0)
792                         break;
793                 vti6_parm_from_user(&p1, &p);
794                 t = vti6_locate(net, &p1, cmd == SIOCADDTUNNEL);
795                 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
796                         if (t) {
797                                 if (t->dev != dev) {
798                                         err = -EEXIST;
799                                         break;
800                                 }
801                         } else
802                                 t = netdev_priv(dev);
803 
804                         err = vti6_update(t, &p1);
805                 }
806                 if (t) {
807                         err = 0;
808                         vti6_parm_to_user(&p, &t->parms);
809                         if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
810                                 err = -EFAULT;
811 
812                 } else
813                         err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
814                 break;
815         case SIOCDELTUNNEL:
816                 err = -EPERM;
817                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
818                         break;
819 
820                 if (dev == ip6n->fb_tnl_dev) {
821                         err = -EFAULT;
822                         if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
823                                 break;
824                         err = -ENOENT;
825                         vti6_parm_from_user(&p1, &p);
826                         t = vti6_locate(net, &p1, 0);
827                         if (!t)
828                                 break;
829                         err = -EPERM;
830                         if (t->dev == ip6n->fb_tnl_dev)
831                                 break;
832                         dev = t->dev;
833                 }
834                 err = 0;
835                 unregister_netdevice(dev);
836                 break;
837         default:
838                 err = -EINVAL;
839         }
840         return err;
841 }
842 
843 /**
844  * vti6_tnl_change_mtu - change mtu manually for tunnel device
845  *   @dev: virtual device associated with tunnel
846  *   @new_mtu: the new mtu
847  *
848  * Return:
849  *   0 on success,
850  *   %-EINVAL if mtu too small
851  **/
852 static int vti6_change_mtu(struct net_device *dev, int new_mtu)
853 {
854         if (new_mtu < IPV6_MIN_MTU)
855                 return -EINVAL;
856 
857         dev->mtu = new_mtu;
858         return 0;
859 }
860 
861 static const struct net_device_ops vti6_netdev_ops = {
862         .ndo_init       = vti6_dev_init,
863         .ndo_uninit     = vti6_dev_uninit,
864         .ndo_start_xmit = vti6_tnl_xmit,
865         .ndo_do_ioctl   = vti6_ioctl,
866         .ndo_change_mtu = vti6_change_mtu,
867         .ndo_get_stats64 = ip_tunnel_get_stats64,
868         .ndo_get_iflink = ip6_tnl_get_iflink,
869 };
870 
871 /**
872  * vti6_dev_setup - setup virtual tunnel device
873  *   @dev: virtual device associated with tunnel
874  *
875  * Description:
876  *   Initialize function pointers and device parameters
877  **/
878 static void vti6_dev_setup(struct net_device *dev)
879 {
880         dev->netdev_ops = &vti6_netdev_ops;
881         dev->destructor = vti6_dev_free;
882 
883         dev->type = ARPHRD_TUNNEL6;
884         dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr);
885         dev->mtu = ETH_DATA_LEN;
886         dev->flags |= IFF_NOARP;
887         dev->addr_len = sizeof(struct in6_addr);
888         netif_keep_dst(dev);
889 }
890 
891 /**
892  * vti6_dev_init_gen - general initializer for all tunnel devices
893  *   @dev: virtual device associated with tunnel
894  **/
895 static inline int vti6_dev_init_gen(struct net_device *dev)
896 {
897         struct ip6_tnl *t = netdev_priv(dev);
898 
899         t->dev = dev;
900         t->net = dev_net(dev);
901         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
902         if (!dev->tstats)
903                 return -ENOMEM;
904         dev_hold(dev);
905         return 0;
906 }
907 
908 /**
909  * vti6_dev_init - initializer for all non fallback tunnel devices
910  *   @dev: virtual device associated with tunnel
911  **/
912 static int vti6_dev_init(struct net_device *dev)
913 {
914         struct ip6_tnl *t = netdev_priv(dev);
915         int err = vti6_dev_init_gen(dev);
916 
917         if (err)
918                 return err;
919         vti6_link_config(t);
920         return 0;
921 }
922 
923 /**
924  * vti6_fb_tnl_dev_init - initializer for fallback tunnel device
925  *   @dev: fallback device
926  *
927  * Return: 0
928  **/
929 static int __net_init vti6_fb_tnl_dev_init(struct net_device *dev)
930 {
931         struct ip6_tnl *t = netdev_priv(dev);
932         struct net *net = dev_net(dev);
933         struct vti6_net *ip6n = net_generic(net, vti6_net_id);
934 
935         t->parms.proto = IPPROTO_IPV6;
936 
937         rcu_assign_pointer(ip6n->tnls_wc[0], t);
938         return 0;
939 }
940 
941 static int vti6_validate(struct nlattr *tb[], struct nlattr *data[])
942 {
943         return 0;
944 }
945 
946 static void vti6_netlink_parms(struct nlattr *data[],
947                                struct __ip6_tnl_parm *parms)
948 {
949         memset(parms, 0, sizeof(*parms));
950 
951         if (!data)
952                 return;
953 
954         if (data[IFLA_VTI_LINK])
955                 parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
956 
957         if (data[IFLA_VTI_LOCAL])
958                 parms->laddr = nla_get_in6_addr(data[IFLA_VTI_LOCAL]);
959 
960         if (data[IFLA_VTI_REMOTE])
961                 parms->raddr = nla_get_in6_addr(data[IFLA_VTI_REMOTE]);
962 
963         if (data[IFLA_VTI_IKEY])
964                 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
965 
966         if (data[IFLA_VTI_OKEY])
967                 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
968 }
969 
970 static int vti6_newlink(struct net *src_net, struct net_device *dev,
971                         struct nlattr *tb[], struct nlattr *data[])
972 {
973         struct net *net = dev_net(dev);
974         struct ip6_tnl *nt;
975 
976         nt = netdev_priv(dev);
977         vti6_netlink_parms(data, &nt->parms);
978 
979         nt->parms.proto = IPPROTO_IPV6;
980 
981         if (vti6_locate(net, &nt->parms, 0))
982                 return -EEXIST;
983 
984         return vti6_tnl_create2(dev);
985 }
986 
987 static void vti6_dellink(struct net_device *dev, struct list_head *head)
988 {
989         struct net *net = dev_net(dev);
990         struct vti6_net *ip6n = net_generic(net, vti6_net_id);
991 
992         if (dev != ip6n->fb_tnl_dev)
993                 unregister_netdevice_queue(dev, head);
994 }
995 
996 static int vti6_changelink(struct net_device *dev, struct nlattr *tb[],
997                            struct nlattr *data[])
998 {
999         struct ip6_tnl *t;
1000         struct __ip6_tnl_parm p;
1001         struct net *net = dev_net(dev);
1002         struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1003 
1004         if (dev == ip6n->fb_tnl_dev)
1005                 return -EINVAL;
1006 
1007         vti6_netlink_parms(data, &p);
1008 
1009         t = vti6_locate(net, &p, 0);
1010 
1011         if (t) {
1012                 if (t->dev != dev)
1013                         return -EEXIST;
1014         } else
1015                 t = netdev_priv(dev);
1016 
1017         return vti6_update(t, &p);
1018 }
1019 
1020 static size_t vti6_get_size(const struct net_device *dev)
1021 {
1022         return
1023                 /* IFLA_VTI_LINK */
1024                 nla_total_size(4) +
1025                 /* IFLA_VTI_LOCAL */
1026                 nla_total_size(sizeof(struct in6_addr)) +
1027                 /* IFLA_VTI_REMOTE */
1028                 nla_total_size(sizeof(struct in6_addr)) +
1029                 /* IFLA_VTI_IKEY */
1030                 nla_total_size(4) +
1031                 /* IFLA_VTI_OKEY */
1032                 nla_total_size(4) +
1033                 0;
1034 }
1035 
1036 static int vti6_fill_info(struct sk_buff *skb, const struct net_device *dev)
1037 {
1038         struct ip6_tnl *tunnel = netdev_priv(dev);
1039         struct __ip6_tnl_parm *parm = &tunnel->parms;
1040 
1041         if (nla_put_u32(skb, IFLA_VTI_LINK, parm->link) ||
1042             nla_put_in6_addr(skb, IFLA_VTI_LOCAL, &parm->laddr) ||
1043             nla_put_in6_addr(skb, IFLA_VTI_REMOTE, &parm->raddr) ||
1044             nla_put_be32(skb, IFLA_VTI_IKEY, parm->i_key) ||
1045             nla_put_be32(skb, IFLA_VTI_OKEY, parm->o_key))
1046                 goto nla_put_failure;
1047         return 0;
1048 
1049 nla_put_failure:
1050         return -EMSGSIZE;
1051 }
1052 
1053 static const struct nla_policy vti6_policy[IFLA_VTI_MAX + 1] = {
1054         [IFLA_VTI_LINK]         = { .type = NLA_U32 },
1055         [IFLA_VTI_LOCAL]        = { .len = sizeof(struct in6_addr) },
1056         [IFLA_VTI_REMOTE]       = { .len = sizeof(struct in6_addr) },
1057         [IFLA_VTI_IKEY]         = { .type = NLA_U32 },
1058         [IFLA_VTI_OKEY]         = { .type = NLA_U32 },
1059 };
1060 
1061 static struct rtnl_link_ops vti6_link_ops __read_mostly = {
1062         .kind           = "vti6",
1063         .maxtype        = IFLA_VTI_MAX,
1064         .policy         = vti6_policy,
1065         .priv_size      = sizeof(struct ip6_tnl),
1066         .setup          = vti6_dev_setup,
1067         .validate       = vti6_validate,
1068         .newlink        = vti6_newlink,
1069         .dellink        = vti6_dellink,
1070         .changelink     = vti6_changelink,
1071         .get_size       = vti6_get_size,
1072         .fill_info      = vti6_fill_info,
1073         .get_link_net   = ip6_tnl_get_link_net,
1074 };
1075 
1076 static void __net_exit vti6_destroy_tunnels(struct vti6_net *ip6n)
1077 {
1078         int h;
1079         struct ip6_tnl *t;
1080         LIST_HEAD(list);
1081 
1082         for (h = 0; h < HASH_SIZE; h++) {
1083                 t = rtnl_dereference(ip6n->tnls_r_l[h]);
1084                 while (t) {
1085                         unregister_netdevice_queue(t->dev, &list);
1086                         t = rtnl_dereference(t->next);
1087                 }
1088         }
1089 
1090         t = rtnl_dereference(ip6n->tnls_wc[0]);
1091         unregister_netdevice_queue(t->dev, &list);
1092         unregister_netdevice_many(&list);
1093 }
1094 
1095 static int __net_init vti6_init_net(struct net *net)
1096 {
1097         struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1098         struct ip6_tnl *t = NULL;
1099         int err;
1100 
1101         ip6n->tnls[0] = ip6n->tnls_wc;
1102         ip6n->tnls[1] = ip6n->tnls_r_l;
1103 
1104         err = -ENOMEM;
1105         ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6_vti0",
1106                                         NET_NAME_UNKNOWN, vti6_dev_setup);
1107 
1108         if (!ip6n->fb_tnl_dev)
1109                 goto err_alloc_dev;
1110         dev_net_set(ip6n->fb_tnl_dev, net);
1111         ip6n->fb_tnl_dev->rtnl_link_ops = &vti6_link_ops;
1112 
1113         err = vti6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1114         if (err < 0)
1115                 goto err_register;
1116 
1117         err = register_netdev(ip6n->fb_tnl_dev);
1118         if (err < 0)
1119                 goto err_register;
1120 
1121         t = netdev_priv(ip6n->fb_tnl_dev);
1122 
1123         strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
1124         return 0;
1125 
1126 err_register:
1127         vti6_dev_free(ip6n->fb_tnl_dev);
1128 err_alloc_dev:
1129         return err;
1130 }
1131 
1132 static void __net_exit vti6_exit_net(struct net *net)
1133 {
1134         struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1135 
1136         rtnl_lock();
1137         vti6_destroy_tunnels(ip6n);
1138         rtnl_unlock();
1139 }
1140 
1141 static struct pernet_operations vti6_net_ops = {
1142         .init = vti6_init_net,
1143         .exit = vti6_exit_net,
1144         .id   = &vti6_net_id,
1145         .size = sizeof(struct vti6_net),
1146 };
1147 
1148 static struct xfrm6_protocol vti_esp6_protocol __read_mostly = {
1149         .handler        =       vti6_rcv,
1150         .cb_handler     =       vti6_rcv_cb,
1151         .err_handler    =       vti6_err,
1152         .priority       =       100,
1153 };
1154 
1155 static struct xfrm6_protocol vti_ah6_protocol __read_mostly = {
1156         .handler        =       vti6_rcv,
1157         .cb_handler     =       vti6_rcv_cb,
1158         .err_handler    =       vti6_err,
1159         .priority       =       100,
1160 };
1161 
1162 static struct xfrm6_protocol vti_ipcomp6_protocol __read_mostly = {
1163         .handler        =       vti6_rcv,
1164         .cb_handler     =       vti6_rcv_cb,
1165         .err_handler    =       vti6_err,
1166         .priority       =       100,
1167 };
1168 
1169 static bool is_vti6_tunnel(const struct net_device *dev)
1170 {
1171         return dev->netdev_ops == &vti6_netdev_ops;
1172 }
1173 
1174 static int vti6_device_event(struct notifier_block *unused,
1175                              unsigned long event, void *ptr)
1176 {
1177         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1178         struct ip6_tnl *t = netdev_priv(dev);
1179 
1180         if (!is_vti6_tunnel(dev))
1181                 return NOTIFY_DONE;
1182 
1183         switch (event) {
1184         case NETDEV_DOWN:
1185                 if (!net_eq(t->net, dev_net(dev)))
1186                         xfrm_garbage_collect(t->net);
1187                 break;
1188         }
1189         return NOTIFY_DONE;
1190 }
1191 
1192 static struct notifier_block vti6_notifier_block __read_mostly = {
1193         .notifier_call = vti6_device_event,
1194 };
1195 
1196 /**
1197  * vti6_tunnel_init - register protocol and reserve needed resources
1198  *
1199  * Return: 0 on success
1200  **/
1201 static int __init vti6_tunnel_init(void)
1202 {
1203         const char *msg;
1204         int err;
1205 
1206         register_netdevice_notifier(&vti6_notifier_block);
1207 
1208         msg = "tunnel device";
1209         err = register_pernet_device(&vti6_net_ops);
1210         if (err < 0)
1211                 goto pernet_dev_failed;
1212 
1213         msg = "tunnel protocols";
1214         err = xfrm6_protocol_register(&vti_esp6_protocol, IPPROTO_ESP);
1215         if (err < 0)
1216                 goto xfrm_proto_esp_failed;
1217         err = xfrm6_protocol_register(&vti_ah6_protocol, IPPROTO_AH);
1218         if (err < 0)
1219                 goto xfrm_proto_ah_failed;
1220         err = xfrm6_protocol_register(&vti_ipcomp6_protocol, IPPROTO_COMP);
1221         if (err < 0)
1222                 goto xfrm_proto_comp_failed;
1223 
1224         msg = "netlink interface";
1225         err = rtnl_link_register(&vti6_link_ops);
1226         if (err < 0)
1227                 goto rtnl_link_failed;
1228 
1229         return 0;
1230 
1231 rtnl_link_failed:
1232         xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1233 xfrm_proto_comp_failed:
1234         xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1235 xfrm_proto_ah_failed:
1236         xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1237 xfrm_proto_esp_failed:
1238         unregister_pernet_device(&vti6_net_ops);
1239 pernet_dev_failed:
1240         unregister_netdevice_notifier(&vti6_notifier_block);
1241         pr_err("vti6 init: failed to register %s\n", msg);
1242         return err;
1243 }
1244 
1245 /**
1246  * vti6_tunnel_cleanup - free resources and unregister protocol
1247  **/
1248 static void __exit vti6_tunnel_cleanup(void)
1249 {
1250         rtnl_link_unregister(&vti6_link_ops);
1251         xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1252         xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1253         xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1254         unregister_pernet_device(&vti6_net_ops);
1255         unregister_netdevice_notifier(&vti6_notifier_block);
1256 }
1257 
1258 module_init(vti6_tunnel_init);
1259 module_exit(vti6_tunnel_cleanup);
1260 MODULE_LICENSE("GPL");
1261 MODULE_ALIAS_RTNL_LINK("vti6");
1262 MODULE_ALIAS_NETDEV("ip6_vti0");
1263 MODULE_AUTHOR("Steffen Klassert");
1264 MODULE_DESCRIPTION("IPv6 virtual tunnel interface");
1265 

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